CN113680807A - In-situ ex-situ soil remediation system based on heat pump thermal desorption - Google Patents
In-situ ex-situ soil remediation system based on heat pump thermal desorption Download PDFInfo
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- CN113680807A CN113680807A CN202111016804.7A CN202111016804A CN113680807A CN 113680807 A CN113680807 A CN 113680807A CN 202111016804 A CN202111016804 A CN 202111016804A CN 113680807 A CN113680807 A CN 113680807A
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- heat pump
- heat
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- treatment room
- soil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B40/00—Subcoolers, desuperheaters or superheaters
- F25B40/06—Superheaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/003—Supply-air or gas filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
- F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
- F26B21/086—Humidity by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to an in-situ ex-situ soil remediation system based on heat pump thermal desorption, which comprises a heat treatment room and a heat pump system room, wherein a conveying belt for conveying soil is installed inside the heat treatment room, the top of the heat treatment room is connected with the top of the heat pump system room through an air outlet pipeline, one side of the heat pump system room is connected with the bottom of the heat treatment room through an air supply pipeline, an electric heater is installed at an air delivery port of the air supply pipeline, and a heat pump system is installed inside the heat pump system room. The invention adopts the wind circulation formed by the electric heater and the heat pump system to realize the thermal desorption technology, increases the degradation rate of organic pollutants in soil by the heat strengthening effect of the wind circulation and the heat pump system, makes up the defect of single restoration technology, has low requirements on high temperature resistance and wear resistance of equipment and low equipment and facility cost based on the low-medium temperature thermal desorption technology of the heat pump.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to an in-situ and ex-situ soil remediation system based on heat pump coupling through a chemical oxidation-reduction technology.
Background
Soil is an indispensable natural resource for human beings and is an important material foundation. Along with the adjustment of the urbanization process and the industrial structure, numerous chemical enterprises move from a central urban area to a suburban area, leave over a large number of high-risk composite organic pollution soil sites, and cause adverse effects on the personal health of surrounding masses. Therefore, how to reasonably and efficiently repair the organic matter polluted soil becomes a technical problem which needs to be solved urgently.
The current commonly used soil remediation technology is single, and the technology that the repair ability is strong has the problem that the energy consumption is high, in addition, a large amount of heat is discharged to the air through the form of hot humid air in the correlation technique, and the energy utilization efficiency of the soil remediation system is lower. Therefore, it is necessary to design a soil remediation technology with low energy consumption and strong remediation capability.
Disclosure of Invention
The invention aims to provide an in-situ ex-situ soil remediation system based on heat pump thermal desorption, so as to solve the problems in the background technology.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the utility model provides an original place ectopic soil repair system based on heat pump thermal desorption, includes heat treatment room and heat pump system room, the internally mounted of heat treatment room has the conveyer belt that is used for transporting soil, the conveyer belt output is connected with external soil collecting box through the soil recovery slide, the internally mounted of heat pump system room has heat pump system, one side of heat pump system room is connected with the bottom of heat treatment room through supply-air duct, follows upwards to do the heat treatment room carries hot-blastly.
In the above scheme, the heat pump system of the heat pump system room is independently obtained through an external heating device.
Further, as an embodiment, the heat pump system of the heat pump system room is provided by an air source heat pump, a solar preheating device is installed inside the heat pump system room, the air source heat pump collects outside air, heats the outside air through the solar preheating device, provides hot air of 50-80 ℃ for the heat treatment room, and then conveys the hot air into the heat treatment room through an air supply pipeline.
Further, as an embodiment, an electric heater is installed inside the heat pump system room, an air outlet end of the electric heater is connected with an air supply pipeline to form a heat pump system, and the electric heater is used for heating air and providing hot air at 50-80 ℃ for the heat treatment room.
In the scheme, the heat pump system of the heat pump system room recovers the heat energy of the heat treatment room, then treats and utilizes the heat energy and discharges the heat energy into the heat treatment room.
Further, as an embodiment among them, the top in heat treatment room is connected with the top in heat pump system room through the air-out pipeline, the bottom in heat treatment room is connected to the output of blast pipe, the blast pipe is close to the draught fan is installed to one side of air-out pipeline, the internally mounted in heat pump system room has electric heater, electric heater is used for the heated air, for heat treatment room provides 50-80 ℃ of hot-air, the internally mounted that the blast pipe is close to the air-out end has the forced draught blower.
Still further, an evaporator, a condenser and a heat regenerator are further installed inside the heat pump system room, the evaporator, the condenser and the heat regenerator form a heat pump system, the heat regenerator is installed between the evaporator and the condenser, the bottom of the evaporator is connected with the bottom of the condenser through a compressor, the top of the condenser is connected with the top of the evaporator through a throttle valve, the condenser is installed on the outer side of the electric heater, and the heat regenerator is used for collecting wet air conveyed from an air outlet pipeline and conveying air to the electric heater under the action of the evaporator and the condenser; the heat regenerator is connected with the body of the evaporator through a chamber, and the bottom of the chamber is connected with a condensed water pipe leading to the outside.
In the scheme, soil is conveyed to the conveying belt through a soil conveying slide way on one side of the top of the heat treatment room, and the inclination of the soil recycling slide way is of an adjustable structure; the air supply pipeline is provided with a VOCs treatment device at the air inlet end of the top of the heat treatment room, and an adsorption substance arranged in the VOCs treatment device is activated carbon; and an air filter is also arranged at the air inlet end of the air supply pipeline at the top of the heat treatment room.
In the scheme, at least two conveying belts in the heat treatment room are arranged and are of an upper-layer and lower-layer staggered distributed structure, the output end of the upper-layer conveying belt transfers soil to the input end of the lower-layer conveying belt through the mudguard, and the mudguard is obliquely arranged on the inner wall of the heat treatment room.
Furthermore, soil pollutant concentration detection devices are installed at the top of the conveying end of the conveyor belt at the lowest layer, and a rotating shaft speed regulator is installed on one side of each conveyor belt.
Compared with the prior art, the invention has the beneficial effects that: the invention adopts the wind circulation formed by the electric heater and the heat pump system to realize the thermal desorption technology, and the degradation rate of organic pollutants in the soil is increased by the thermal enhancement of the wind circulation and the heat pump system, thereby making up the defect of a single restoration technology. The invention uses a medium-low temperature thermal desorption technology based on a heat pump, has low requirements on high temperature resistance and wear resistance of equipment, and has low equipment and facility cost. The heat supply scheme used by the thermal desorption repair technology is heat supply of a heat pump, the heat pump can utilize low-grade energy in the environment and consume a small amount of work to generate a large amount of heat, and compared with other heat supply schemes, the energy consumption of the heat pump is low. The heat pump system can recover latent heat and sensible heat from air in the heat treatment room in the soil heating process, and the dividing wall type heat regenerator arranged between the evaporator and the condenser can dry hot and humid air from the heat treatment room and recover waste heat, so that the power consumption under unit heat supply and refrigeration capacity is reduced, and the energy utilization efficiency is improved.
Drawings
The disclosure of the present invention is illustrated with reference to the accompanying drawings. It is to be understood that the drawings are designed solely for the purposes of illustration and not as a definition of the limits of the invention. In the drawings, like reference numerals are used to refer to like parts. Wherein:
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of the present invention in example 2;
fig. 3 is a schematic structural view of the invention in embodiment 5.
Reference numbers in the figures: 1-soil feeder, 2-soil inlet slide way, 3-chemical agent tank, 4-sprayer, 5-conveyor belt, 6-soil conveying slide way, 7-rotating shaft speed regulator, 8-mudguard, 9-soil pollutant concentration detection device, 10-soil recovery slide way, 11-soil collection box, 12-VOCs treatment device, 13-air filter, 14-induced draft fan, 15-air outlet pipeline, 16-throttle valve, 17-evaporator, 18-compressor, 19-condenser, 20-heat regenerator, 21-electric heater, 22-blower, 23-air outlet pipeline, 24-condensate pipe, 25-chemical treatment room, 26-heat treatment room and 27-heat pump system room.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further described in detail with reference to the attached drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution to which the present invention relates.
According to the technical scheme of the invention, a plurality of alternative structural modes and implementation modes can be provided by a person with ordinary skill in the art without changing the essential spirit of the invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as all of the present invention or as limitations or limitations on the technical aspects of the present invention.
The technical solution of the present invention is further described in detail with reference to the accompanying drawings and examples.
Example 1, as shown in fig. 1, an ex-situ soil remediation system based on heat pump thermal desorption comprises a heat treatment room 26 and a heat pump system room 27, wherein soil is conveyed to a conveyor belt 5 through a soil conveying slide 6 on one side of the top of the heat treatment room 26, the conveyor belt 5 is used for conveying the soil treated by chemical agents, and the soil to be treated is in full contact with the chemical agents and hot air during the conveying process.
At least two conveyors 5 are arranged in the heat treatment room 26, the conveyors are in an upper-lower layer staggered distribution structure, and the output end of the upper-layer conveyor 5 transfers soil to the input end of the lower-layer conveyor 5 through a mud guard 8. By adopting the multi-layer (2-layer or 3-layer) conveyor belt 5 for transmission, the length of the soil conveying equipment is reduced, and the occupied area is reduced. When only two belts are provided, the first belt is positioned on top of the second belt, the output end of the first belt transfers the soil to the input end of the second belt through a mudguard 8, and the mudguard 8 is installed obliquely on the inner wall of the heat treatment room 26. The fender 8 on the right side of the heat treatment room 26 is arranged beside the discharge end of the upper first conveyor belt of the heat treatment room 26, and the fender 8 plays a role in guiding when soil is transferred from the upper first conveyor belt to the lower second conveyor belt and also plays a role in guiding hot air.
The action wheel of the first conveyer belt of upper strata is the left wheel in heat treatment room 26, and the direction of rotation is clockwise, and the action wheel of the second conveyer belt of lower floor is the right wheel in heat treatment room 26, and the direction of rotation is anticlockwise. Further, a rotating shaft speed regulator 7 is respectively arranged on one side of the first conveying belt and one side of the second conveying belt, of course, the rotating shaft speed regulator 7 is also arranged on the conveying belt 5 in the chemical treatment room 25, and the rotating shaft speed regulator 7 is used for changing the running speed of the conveying belt 5, so that the soil with different drying degrees can be conveyed conveniently.
Further, soil pollutant concentration detection device 9 is installed at the delivery end top of second conveyer belt, and soil pollutant concentration detection device 9 sets up the end at heat treatment room lower floor second conveyer belt for detect heat treatment room 26 in the concentration of the organic pollutant in the soil of conveyer belt 5 exit, judge whether accord with the requirement after restoreing.
The output end of the conveyor belt 5 in the heat treatment room 26 is connected with an external soil collection box 11 through a soil recovery slideway 10, and the soil recovery slideway 10 is used for conveying the treated soil out of the whole soil remediation system. The gradient of the soil recovery slide way 10 adopts an adjustable structure, a telescopic cylinder can be arranged outside the heat treatment room 26 and at the bottom of the soil recovery slide way 10, the gradient of the telescopic cylinder can be adjusted by lifting of the telescopic cylinder, and the contact part of the soil recovery slide way 10 and the heat treatment room 26 is well sealed. The soil recovery slide way 10 is placed for the slope, and inclination is adjustable, can change inclination's size according to soil viscosity, and the recovery slide way 10 of slope can also play the guide effect of hot-air in addition.
The top of the heat treatment room 26 is connected with the top of the heat pump system room 27 through the air outlet pipeline 15, one side of the heat pump system room 27 is connected with the bottom of the heat treatment room 26 through the air supply pipeline 23, the electric heater 21 is installed at the air delivery port of the air supply pipeline 23, and the heat pump system is installed inside the heat pump system room 27. The heat treatment room 26 is supplied with hot air from below to above through the air supply duct 23, and the hot air is generated by the heat pump system. The wet air is output from the air outlet pipeline 15 at the top of the heat treatment room 26 in the heat pump system, and the heated wet air is changed into dry hot air and enters the heat treatment room 26 from the air supply pipeline 23 at the bottom of the heat treatment room 26 to complete the circulation operation.
As an optimal scheme, VOCs processing apparatus 12 is installed to the air inlet end of air-out pipeline 15, and VOCs processing apparatus 12 arranges the air-out pipeline entry in heat treatment room 26 top for collect the residual organic pollutant that volatilizes out in the soil that carries in the absorption air, avoid volatile organic pollutant to lead to the fact secondary pollution for external environment through air-out pipeline 15. In addition, an induced draft fan 14 is installed inside the air supply duct 23, and the induced draft fan 14 is a variable frequency axial flow fan for guiding air in the heat treatment room 26 to the air supply duct 23.
Further, the adsorbent material disposed inside the VOCs treatment apparatus 12 is activated carbon. VOCs (volatile organic compounds) are used as main components of industrial waste gas, have great influence on the atmospheric environment and human body, and the adsorption recovery technology mainly adopts a method of adsorbing organic solvents in the waste gas by using adsorption materials and desorbing and recycling the organic solvents, wherein activated carbon is used as the adsorption materials.
Furthermore, an air filter 13 is further installed at the air inlet end of the air outlet pipeline 15, and the air filter 13 cooperates with the induced draft fan 14 to draw out the humid air from the top of the heat treatment room 26 and send the humid air back to the heat pump system. The air filter 13 can filter fine particles, prevent abrasion of subsequent equipment such as the induced draft fan 14 and the like, and is provided with a temperature and humidity sensor for monitoring the temperature and humidity of the hot and humid air in the air supply pipeline 23 in real time. The blower 22 is installed inside the air supply duct 23 near the air outlet end, the blower 22 is a variable frequency centrifugal fan, and the blower 22 is used for sending hot air generated by the heat pump system to the bottom of the heat treatment room 26 to form an air circulation system.
In embodiment 2, the heat pump system of the heat pump system room 27 is separately obtained by an external heating device.
For example, an electric heater 21 is installed inside the air supply duct 23, and the air is heated by the electric heater 21 to form a heat pump system for outputting hot air and supplying hot air of 50-80 ℃ to the heat treatment room 26. A temperature and humidity sensor is integrated in the electric heater 21, when the temperature of the air in the air supply duct 23 is lower than a specified value, the electric heater 21 works and heats the air to a specified temperature value, and otherwise, the electric heater does not work.
For another example, referring to fig. 2, the heat pump system of the heat pump system room 27 is provided by an air source heat pump, a solar preheating device is installed inside the heat pump system room 27, the air source heat pump collects outside air, heats the outside air by the solar preheating device, provides hot air of 50-80 ℃ for the heat treatment room 26, and then delivers the hot air into the heat treatment room 26 through the air delivery pipe 23. And under the condition that the weather allows, the fresh air is preheated, so that the purpose of saving electric energy is achieved.
In embodiment 3, the heat pump system of the heat pump system room 27 recovers the heat energy of the heat treatment room 26, and then treats and utilizes the heat energy to discharge into the heat treatment room 26.
The top of the heat treatment room 26 is connected with the top of the heat pump system room 27 through the air outlet pipeline 15, the bottom of the heat treatment room 26 is connected with the air supply pipeline 23, the heat treatment room 26 is supplied with hot air from bottom to top through the air supply pipeline 23, and the hot air is generated by the heat pump system or the electric heater 21. For example, an electric heater 21 is installed inside the air supply duct 23, and the air is heated by the electric heater 21 to form a heat pump system for outputting hot air and supplying hot air of 50-80 ℃ to the heat treatment room 26. The wet air is output from the air supply pipeline 23 at the top of the heat treatment room 26 in the heat pump system, and the heated and dried hot air enters the heat treatment room 26 from the air supply pipeline 23 at the bottom of the heat treatment room 26 to complete the circulation operation.
In addition, the electric heater 21 may be installed in another place inside the heat pump system room 27, and a simple heat pump system may be configured to output hot air by heating air by the electric heater 21. A temperature and humidity sensor is integrated in the electric heater 21, when the temperature of the air in the air supply duct 23 is lower than a specified value, the electric heater 21 works and heats the air to a specified temperature value, and otherwise, the electric heater does not work.
Embodiment 4 is based on embodiment 3, and as a preferable scheme, in one embodiment, the evaporator 17, the condenser 19 and the regenerator 20 are further installed inside the heat pump system room 27, and the regenerator 20 is a dividing wall type regenerator having a hot section and a cold section. The heat regenerator 20 is arranged between the evaporator 17 and the condenser 19, the bottom of the evaporator 17 is connected with the bottom of the condenser 19 through the compressor 18, the top of the condenser 19 is connected with the top of the evaporator 17 through the throttle valve 16, the condenser 19 is arranged outside the electric heater 21, and the heat regenerator 20 is used for collecting the humid air delivered from the air outlet pipeline 15 and delivering the wind to the electric heater 21 after the actions of the evaporator 17 and the condenser 19. The whole heat pump system is used for generating hot air required for heating and drying soil, wherein the heat regenerator 20 is used for recycling waste heat of hot and humid air from the heat treatment room 26, and the heater 21 is used for heating air with temperature lower than the required temperature from the condenser 19.
In the heat treatment room 26, the blower 22 is used for sending hot air generated by the heat pump system to the bottom of the heat treatment room 26, the air filter 13 is matched with the induced draft fan 14 to draw out wet air from the top of the heat treatment room 26 and send the wet air back to the heat regenerator 20 in the heat pump system, and the wet air passes through the heat regenerator 20, the evaporator 17, the heat regenerator 20 and the condenser 19 in the heat pump system in sequence and then becomes dry hot air to enter the heat treatment room 26 for circulation.
The regenerator 20 is connected to the body of the evaporator 17 by a chamber, the bottom of which is connected to a condensate pipe 24 leading to the outside. When the water droplets generated by the action of the regenerator 20 and the evaporator 17 flow to the bottom of the chamber, they are discharged from the condensate pipe 24 out of the heat pump system. The air is heated by the condenser 19 to become hot air, and then sent to the heat treatment room 26 by the blower 22 to heat the soil and absorb moisture in the soil.
Example 5 referring to fig. 3, a soil feeder 1 and a chemical treatment room 25 may be additionally provided to transport and treat soil based on any one of examples 1 to 4.
The output end of the soil feeder 1 is connected with the chemical treatment room 25 through a soil inlet slide way 2, the soil inlet slide way 2 is used for conveying soil to be treated to the conveyor belt 5, and the joint between the two treatment rooms is well sealed. The chemical treatment room 25 is provided at the top thereof with a chemical spraying device for spraying a chemical into the soil to react with the organic pollutants.
Chemical agent atomizer includes chemical agent jar 3 and spray thrower 4, and chemical agent jar 3 is installed at the outside top of chemical treatment room 25, and spray thrower 4 is equipped with a plurality ofly, sets up along a straight line, and every spray thrower 4 all is connected with chemical agent jar 3 through the pipeline, and house steward connection of accessible, spray thrower 4 are installed at the cavity top of chemical treatment room 25. The sprayer 4 is used for spraying the chemical oxidant or the chemical reducing agent in the chemical agent tank 3 into the soil to be treated, and is used for spraying the chemical agent into the soil to react with the organic pollutants.
Inside the chemical treatment room 25 and inside the heat treatment room 26 are installed a conveyor belt 5 for conveying soil, respectively, and the conveyor belt 5 is used to convey the soil to be treated, which is brought into sufficient contact with the chemical agent and the hot air during the conveyance. The chemical agent spraying device is positioned on the top of the conveyor belt 5 in the interior of the chemical treatment room 25, and the output end of the conveyor belt 5 in the interior of the chemical treatment room 25 is connected with the inlet end of the conveyor belt 5 in the interior of the heat treatment room 26 through the soil conveying chute 6.
With continued reference to FIG. 3, the workflow of the present invention: after soil to be treated enters the conveying belt 5 in the chemical treatment room 25 through the soil inlet slide way 2 after entering from the soil feeder 1, the sprayer 4 starts to spray chemical oxidant or reducing agent to the soil, the agent in the chemical agent tank 3 is not fixed, and different chemical agents are selected for treatment according to different types of polluted soil. The soil sprayed with the chemical agent enters the heat treatment room 26 along with the movement of the conveyor belt 5, and the soil is fully heated by hot air flowing from the bottom of the heat treatment room 26 in the moving process, so that the treatment efficiency and effect of the chemical agent are improved. Thus, the chemical agent in the soil is improved in activity after being heated, the degradation effect on organic pollutants is enhanced, and in addition, the soil environment can be improved. The heating can reduce the viscosity of the water and increase the buoyancy of the water, thereby increasing the availability of the organic pollutants and promoting the full contact of the organic pollutants and the chemical agents. In addition, after the soil is heated, organic pollutants in the soil are evaporated and taken away by hot air, so that the treatment effect of the soil pollutants is improved.
The air outlet department at 26 tops in heat treatment room sets gradually VOCs processing apparatus 12 and air cleaner 13, and VOCs processing apparatus 12 is an active carbon adsorption device for organic pollutant that evaporates out in the soil that carries in the adsorption-air, avoid the outflow of volatile organic pollutant to cause the secondary pollution to the environment. After the air passes through the air filter 13, impurities such as tiny particles carried by the air are filtered, and the abrasion of equipment such as the induced draft fan 14 is reduced. The hot air is sent from the heat pump system constituted by the electric heater 21 to the heat treatment room 26 by the blower 22, and is circulated.
The wet air from the heat treatment room 26 enters the heat pump system through the induced draft fan 14 and the air outlet pipeline 15, the wet air firstly flows through the hot section of the dividing wall type heat regenerator 20 and then enters the evaporator 17, the refrigerant evaporates in the evaporator 17 to absorb the heat of the wet air, and the water vapor in the wet air is cooled and condensed and is discharged from the condensate pipe 24. The cold air from the evaporator 17 flows through the cold section of the heat regenerator 20 to exchange heat with the hot humid air in the hot section, so that the waste heat recovery of the hot humid air can be realized, the power consumption under unit heat supply and refrigeration capacity is reduced, and the utilization efficiency of energy is improved. The preheated air flows through the condenser 19 after coming out of the heat regenerator 20 to absorb the heat released by the condensation of the refrigerant, and becomes the hot air required by the operation of the heat treatment room 26, and the electric heater 21 starts to operate when the temperature of the hot air coming out of the condenser 19 is lower than a specified value, so as to heat the air to a specified temperature value. The hot air is sent from the heat pump system to the heat treatment room 26 by the blower 22, and is circulated. The chemical treatment room 25, the heat treatment room 26 and the heat pump system room 27 are three rooms connected by pipelines, and the connection between every two treatment rooms is well sealed.
In order to improve the overall operation efficiency of the soil remediation system, the soil pollutant concentration monitoring device 9 is arranged at the tail end of the lower-layer second conveyor belt, high-precision temperature and humidity sensors can be respectively arranged in the air filter 13 and the electric heater 21, and the degradation treatment effect of soil organic pollutants can be monitored. During implementation, the output power of the heat pump system unit, the rotating speed of the driving wheel of the conveyor belt 5, the spraying flow of the sprayer 4 and the rotating speeds of the air feeder 22 and the induced draft fan 14 can be matched through an external intelligent integrated control system, so that the system can operate under the optimal working condition with both the energy utilization efficiency and the soil pollutant degradation efficiency.
In conclusion, the heat pump hot air circulation system adopted by the invention can select a circulation recovery closed mode, the connection part of the two system rooms is well sealed, the volatile organic pollutants in the soil can be prevented from leaking into the environment, and the secondary pollution to the environment is prevented. In the heat treatment room 26, the soil is subjected to a combination of a chemical remediation technology and a thermal desorption technology, so that the activation of the chemical agent under a heating condition is improved, and the degradation efficiency of organic pollutants in the soil is improved. The heat regenerator 20 is arranged in the heat pump system, so that the waste heat of the wet air is recycled, the power consumption under unit heat supply and refrigerating capacity is reduced, and the utilization efficiency of energy is improved. Soil pollutant concentration monitoring devices 9 that soil exit set up, the humiture sensor that air cleaner 13 and electric heater 21 set up, but the restoration effect of real-time supervision soil in time matches the operating condition of chemical spray thrower 4, conveyer belt 5, heat pump set, forced draught blower 22, draught fan 14 and electric heater 21, improves soil repair system's whole operating efficiency, makes the system move under the best operating mode of taking into account energy utilization efficiency and soil pollutant degradation efficiency.
The invention adopts the wind circulation formed by the electric heater 21 and the heat pump system to realize the thermal desorption technology, and the degradation rate of organic pollutants in the soil is increased by the thermal enhancement of the wind circulation and the heat pump system, thereby making up the defect of a single restoration technology. The invention uses a medium-low temperature thermal desorption technology based on a heat pump, has low requirements on high temperature resistance and wear resistance of equipment, and has low equipment and facility cost. The heat supply scheme used by the thermal desorption repair technology is heat supply of a heat pump, the heat pump can utilize low-grade energy in the environment and consume a small amount of work to generate a large amount of heat, and compared with other heat supply schemes, the energy consumption of the heat pump is low. The heat pump system can recover latent heat and sensible heat from air in the heat treatment room in the soil heating process, and the dividing wall type heat regenerator arranged between the evaporator and the condenser can dry hot and humid air from the heat treatment room and recover waste heat, so that the power consumption under unit heat supply and refrigeration capacity is reduced, and the energy utilization efficiency is improved. Compared with the traditional high-temperature heating, the heat pump can effectively control the humidity and the temperature of the environment to be randomly adjustable at minus 20-100 ℃.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. The utility model provides an in situ ectopic soil repair system based on heat pump thermal desorption which characterized in that: including heat treatment room (26) and heat pump system room (27), the internally mounted of heat treatment room (26) has conveyer belt (5) that are used for transporting soil, conveyer belt (5) output is connected with external soil collecting box (11) through soil recovery slide (10), the internally mounted of heat pump system room (27) has heat pump system, one side of heat pump system room (27) is connected with the bottom of heat treatment room (26) through supply air duct (23), does from making progress down heat treatment room (26) carry hot-blastly.
2. The in-situ ex-situ soil remediation system based on heat pump thermal desorption as claimed in claim 1, wherein: the heat pump system of the heat pump system room (27) recovers the heat energy of the heat treatment room (26), then treats and utilizes the heat energy, and discharges the heat energy into the heat treatment room (26).
3. The in-situ ex-situ soil remediation system based on heat pump thermal desorption as claimed in claim 2, wherein: the top in heat treatment room (26) is connected through the top of air-out pipeline (15) and heat pump system room (27), the bottom in heat treatment room (26) is connected to the output of air supply pipeline (23), air supply pipeline (23) are close to draught fan (14) are installed to one side of air-out pipeline (15), the internally mounted of heat pump system room (27) has electric heater (21), electric heater (21) are used for heated air, for heat treatment room (26) provide 50-80 ℃ hot-air, air supply pipeline (23) are close to the internally mounted of air-out end and have forced draught blower (22).
4. The in-situ ex-situ soil remediation system based on heat pump thermal desorption as claimed in claim 3, wherein: the heat pump system room (27) is internally provided with an evaporator (17), a condenser (19) and a heat regenerator (20), the evaporator (17), the condenser (19) and the heat regenerator (20) form a heat pump system, the heat regenerator (20) is arranged between the evaporator (17) and the condenser (19), the bottom of the evaporator (17) is connected with the bottom of the condenser (19) through a compressor (18), the top of the condenser (19) is connected with the top of the evaporator (17) through a throttle valve (16), the condenser (19) is arranged on the outer side of the electric heater (21), and the heat regenerator (20) is used for collecting wet air conveyed from an air outlet pipeline (15) and conveying the air to the electric heater (21) after the action of the evaporator (17) and the condenser (19).
5. The in-situ ex-situ soil remediation system based on heat pump thermal desorption as claimed in claim 4, wherein: the heat regenerator (20) is connected with the body of the evaporator (17) through a chamber, and the bottom of the chamber is connected with a condensed water pipe (24) leading to the outside.
6. The in-situ ex-situ soil remediation system based on heat pump thermal desorption as claimed in claim 1, wherein: the heat treatment room (26) is characterized in that at least two conveying belts (5) are arranged in the heat treatment room (26) and are of an upper-layer and lower-layer staggered distributed structure, the output end of the upper-layer conveying belt transfers soil to the input end of the lower-layer conveying belt through a mudguard (8), and the mudguard (8) is obliquely arranged on the inner wall of the heat treatment room (26).
7. The in-situ ex-situ soil remediation system based on heat pump thermal desorption of claim 9, wherein: soil pollutant concentration detection devices (9) are installed at the top of the conveying end of the conveyor belt (5) at the lowest layer, and a rotating shaft speed regulator (7) is installed on one side of each conveyor belt (5).
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