CN109185901B - Flare gas recycling system for power generation and recycling method thereof - Google Patents
Flare gas recycling system for power generation and recycling method thereof Download PDFInfo
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- CN109185901B CN109185901B CN201811195523.0A CN201811195523A CN109185901B CN 109185901 B CN109185901 B CN 109185901B CN 201811195523 A CN201811195523 A CN 201811195523A CN 109185901 B CN109185901 B CN 109185901B
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- 238000010248 power generation Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title description 11
- 238000004064 recycling Methods 0.000 title description 8
- 238000003860 storage Methods 0.000 claims abstract description 66
- 238000011084 recovery Methods 0.000 claims abstract description 28
- 238000001179 sorption measurement Methods 0.000 claims abstract description 23
- 238000012545 processing Methods 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000003672 processing method Methods 0.000 claims abstract description 6
- 238000002485 combustion reaction Methods 0.000 claims description 15
- 238000000926 separation method Methods 0.000 claims description 8
- 238000000746 purification Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 abstract description 157
- 239000002912 waste gas Substances 0.000 abstract description 3
- 239000000446 fuel Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 239000003463 adsorbent Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000002808 molecular sieve Substances 0.000 description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/047—Pressure swing adsorption
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2201/00—Pretreatment
- F23G2201/60—Separating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2201/00—Pretreatment
- F23G2201/70—Blending
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2206/00—Waste heat recuperation
- F23G2206/20—Waste heat recuperation using the heat in association with another installation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/14—Gaseous waste or fumes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2900/00—Special features of, or arrangements for incinerators
- F23G2900/70601—Temporary storage means, e.g. buffers for accumulating fumes or gases, between treatment stages
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/12—Heat utilisation in combustion or incineration of waste
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Separation Of Gases By Adsorption (AREA)
Abstract
The invention discloses a flare gas recovery processing system and a recovery processing method thereof for power generation, relates to waste gas recovery, and particularly relates to processing and recovery of flare gas. The device comprises a flare gas collecting pipeline, a first gas storage tank, an electric valve, a gas holder and a linkage control circuit; the linkage control circuit comprises a first concentration sensor, a current relay, a power supply, a first air pump and an electric actuator of an electric valve; a low-concentration flare gas treatment pipeline is also connected between the first gas storage tank and the gas holder; the low-concentration flare gas treatment pipeline comprises a water sealed tank, a liquid separating tank, a pressure swing adsorption tower, a second concentration sensor, a control module, a second air pump and a second air storage tank, and a gas outlet of the gas holder is also connected with a gas power generation system; the gas power generation system at least comprises a combustor, an engine and a generator, wherein the combustor, the engine and the generator are sequentially connected through pipelines.
Description
Technical Field
The invention discloses a flare gas recovery processing system and a recovery processing method thereof for power generation, relates to waste gas recovery, and particularly relates to processing and recovery of flare gas.
Background
The flare gas is mainly waste gas discharged from workshops in normal operation or accident state, and mainly comprises hydrocarbon and hydrogen, wherein many substances are harmful to human bodies. Most of them are heavier than air, and if put into the atmosphere, they spread, they are deposited on the ground and reach high concentrations, which cause serious environmental pollution and harm to human health. If a fire is hit, a fire or even an explosion will occur. To prevent these hazards, people burn off these gases in a concentrated way to prevent them from later suffering.
The torch converts these flammable, explosive, toxic and corrosive gases into harmless carbon dioxide, water or other substances with low toxicity by burning. However, the direct burning of these high heating value flare gases is wasteful, and many plants are recovering the flare gas in thousands of meters as a useful fuel in response to the call to "quench the flare". Therefore, the recycling of the flare gas not only can create economic benefits, but also can reduce the atmospheric pollution, and has good environmental benefits and social benefits.
At present, the recovery method of the domestic and foreign flare gas is mainly divided into a raw material type and a fuel type. The feed type is to recover the useful components in the flare gas as a production feed for reprocessing to increase product yield, which is applicable where the flare gas contains a higher level of individual useful components, which requires consideration of process possibilities and economic rationality. The fuel type is to use the recycled flare gas as fuel, and the condition is generally suitable for relatively large chemical devices, and is particularly suitable for the condition that the integral components of the flare gas are too complex and a certain component is difficult to separate and extract in petrochemical devices.
Currently, there is a lack of systems and methods for recovery and reuse of flare gas that are widely applicable and that can adjust the concentration of the flare gas.
Disclosure of Invention
The invention aims to provide a flare gas recycling system and a recycling method thereof for power generation, which can effectively recycle the concentration of the discharged flare gas and adjust the concentration range of the discharged flare gas to improve the gas combustion efficiency, then the gas is introduced into a combustor to burn to obtain heat energy, then an external combustion engine is used for converting the heat energy into mechanical energy, and finally a power generation method for converting the mechanical energy into electric energy by a power generator is used.
The invention is realized by adopting the following technical scheme:
the flare gas recovery processing system for power generation comprises a flare gas collecting pipeline, a first gas storage tank, an electric valve, a gas holder and a linkage control circuit, wherein the flare gas collecting pipeline, the first gas storage tank, the electric valve and the gas holder are sequentially connected through pipelines; the linkage control circuit comprises a first concentration sensor, a current relay, a power supply, a first air pump and an electric actuator of an electric valve; the first concentration sensor measuring signal port is connected to a pipeline, close to the first air storage tank, of the flare gas collecting pipeline, the signal output end interface of the first concentration sensor is connected with a low-voltage control circuit of the current relay, the high-voltage working circuit of the current relay is connected with a first air pump and an electric actuator of an electric valve in parallel, and the air outlet of the first air pump is connected with the first air storage tank;
a low-concentration flare gas treatment pipeline is also connected between the first gas storage tank and the gas holder; the low-concentration flare gas treatment pipeline comprises a water sealed tank, a liquid separating tank, a pressure swing adsorption tower, a second concentration sensor, a control module, a second air pump and a second air storage tank, wherein the water sealed tank, the liquid separating tank, the pressure swing adsorption tower and the second air storage tank are sequentially connected; the measuring signal port of the second concentration sensor is arranged on a pipeline between the pressure swing adsorption tower and the second air storage tank; the information output port of the second concentration sensor is connected to the control module, the other end of the control module is connected with a control circuit of a second air pump, and the air outlet of the second air pump is connected with a second air storage tank;
the gas outlet of the gas cabinet is also connected with a gas power generation system; the gas power generation system at least comprises a combustor, an engine and a generator, wherein the combustor, the engine and the generator are sequentially connected through pipelines.
The current relay adopts an electromagnetic current relay.
The control module adopts a computer or a singlechip, and the singlechip can adopt a commercially available MCS51 series singlechip.
The PSA process adopted by the pressure swing adsorption tower is divided into a first stage and a second stage; optionally, the adsorbent used in the first stage is 13X (13X molecular sieve); optionally, the adsorbent used in the second stage is CMS (carbon molecular sieve);
the engine employs a Stirling engine.
Working principle: according to the high-concentration flare gas treatment device, a linkage device of the first concentration sensor and the current relay is used, when the first concentration sensor detects that the concentration of the discharged flare gas is higher, the first concentration sensor sends an electric signal to the current relay, so that the current relay is attracted to enable a linkage control circuit to be connected, a first air pump operates to output air to a first air storage tank, the air and the flare gas are mixed in the first air storage tank to enable the concentration of the flare gas to be reduced, an electric valve actuator controls an electric valve to be opened, and the mixed gas is output to a gas holder through the electric valve; when the input signal measured by the first concentration sensor cannot reach a set threshold value, the first concentration sensor transmits a no-current signal to the current relay, the current relay cannot be attracted, so that a working circuit is broken, a power supply cannot output current to the first air pump and the electric valve actuator which are connected in parallel, therefore, the electric valve actuator cannot drive a valve, the electric valve is kept in a closed state, gas is accumulated in the first gas storage tank, so that the pressure in the first gas storage tank rises, the water-sealed tank is broken by low-concentration gas, the water-sealed tank enters the pressure swing adsorption tower, then N2 and CO2 are removed in the pressure swing adsorption tower to purify combustible components in flare gas, and the purified flare gas is led to the second gas storage tank; the concentration of the combustible torch gas in a pipeline between the pressure swing adsorption tower and the second gas storage tank is detected by a second concentration sensor, concentration information is transmitted to the control module, the control module sends out an instruction to control the second air pump to introduce a proper amount of air into the second gas storage tank, and the concentration of the combustible gas in the second gas storage tank is controlled in an optimal combustion concentration range.
The invention has the advantages that: the flare gas recovery processing system for power generation is reasonable in structure and convenient to operate, and the device simultaneously uses the two modules of the high-concentration flare gas processing device and the low-concentration flare gas processing pipeline, so that the concentration of the flare gas is effectively controlled in the optimal combustion concentration range, and the gas utilization rate can be improved. Meanwhile, aiming at the part of the gas power generation system, the Stirling engine is adopted as a typical external combustion engine, compared with an internal combustion engine, the Stirling engine has the characteristic of low requirement on fuel property, and only the hot cylinder end of the Stirling engine is required to be continuously supplied with heat energy, so that the heat energy released by the burner can be stably converted into mechanical energy. The invention can effectively recycle the flare gas and stably generate power, and the whole process has higher automation degree.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
FIG. 1 is a schematic block diagram of a system architecture of the present invention;
FIG. 2 is a flow chart of an implementation of the recycling method of the present invention.
In the figure: 1. the device comprises a first concentration sensor 2, a current relay 3, a first air pump, 4, a power supply 5, an electric actuator 6, a first air storage tank 7, an electric valve 8, a liquid separation tank 9, a pressure swing adsorption tower 10, a gas holder 11, a burner 12, an engine 13, a generator 14, a water seal tank 15, a second air storage tank 16, a second concentration sensor 17, a control module 18 and a second air pump.
Description of the embodiments
Referring to fig. 1, a flare gas recovery processing system for power generation comprises a flare gas collecting pipeline, a first gas storage tank 6, an electric valve 7, a gas holder 10 and a linkage control circuit, wherein the flare gas collecting pipeline, the first gas storage tank 6, the electric valve 7 and the gas holder 10 are sequentially connected through pipelines; the linkage control circuit comprises a first concentration sensor 1, a current relay 2, a power supply 4, a first air pump 3 and an electric actuator 5 of an electric valve; the first concentration sensor measurement signal port is connected to a pipeline, close to the first air storage tank 6, of the flare gas collecting pipeline, the signal output end interface of the first concentration sensor 1 is connected with a low-voltage control circuit of the current relay 2, the high-voltage working circuit of the current relay 2 is connected with a first air pump 3 and an electric actuator 5 of an electric valve in parallel, and an air outlet of the first air pump 3 is connected with the first air storage tank 6;
a low-concentration flare gas treatment pipeline is also connected between the first gas storage tank 6 and the gas cabinet 10; the low-concentration flare gas treatment pipeline comprises a water sealed tank 14, a liquid separating tank 8, a pressure swing adsorption tower 9, a second concentration sensor 16, a control module 17, a second air pump 18 and a second air storage tank 15, wherein the water sealed tank 14, the liquid separating tank 8, the pressure swing adsorption tower 9 and the second air storage tank 15 are sequentially connected; a measurement signal port of the second concentration sensor 16 is arranged on a pipeline between the pressure swing adsorption tower 9 and the second air storage tank 15; the information output port of the second concentration sensor 16 is connected to the control module 17, the other end of the control module 17 is connected with a control circuit of a second air pump 18, and the air outlet of the second air pump 18 is connected with a second air storage tank 15; the gas power generation system connected to the gas outlet of the gas holder 10 includes a burner 11, an engine 12 and a generator 13 connected in sequence through pipes.
Referring to FIG. 2, a recovery processing method of a flare gas recovery processing system for power generation comprises the steps of:
1) The first concentration sensor detects the flare gas discharged by the flare gas collecting pipeline in real time, and when the first concentration sensor detects that the concentration of the discharged flare gas is higher than a preset threshold value, the step 2) is shifted to; otherwise, entering step 3);
2) The first concentration sensor sends an electric signal to the current relay; the current relay is attracted to enable the linkage control circuit to be connected, the first air pump is operated, air is output to the first air storage tank, and the air and the flare gas are mixed in the first air storage tank, so that the concentration of the flare gas is reduced; the electric valve actuator controls the electric valve to be opened, and the mixed gas is output to the gas holder through the electric valve;
3) When the concentration of the discharged flare gas is lower than a preset threshold value, the electric valve is closed, and the discharged flare gas is accumulated in the first gas storage tank, so that the pressure in the first gas storage tank is increased;
3-1) gradually increasing the gas pressure to finally break the water sealed tank, and entering the liquid separating tank;
3-2) the gas subjected to liquid separation in the liquid separation tank enters a pressure swing adsorption tower through a pipeline, the purification of the combustible flare gas is carried out in the pressure swing adsorption tower, and the purified combustible flare gas is led to a second gas storage tank along the pipeline;
3-3) a second concentration sensor mounted in the pipeline detects the concentration of the flammable flare gas in the pipeline between the pressure swing adsorption tower and the second gas storage tank and transmits concentration information to the control module;
3-4) the control module sends out instructions to the second air pump according to the input concentration information, controls the second air pump to introduce a proper amount of air into the second air storage tank, and controls the concentration of the combustible gas in the second air storage tank to be in an optimal combustion concentration range.
Purification, i.e., removal of N, of the flammable flare gas described in step 3-2) 2 And CO 2 To purify the combustible components in the flare gas.
The optimal combustion concentration range in the step 3-4) is that the concentration of the mixed flare gas is 15% -30%, and the two end points are included.
The following describes the model used for the components in the present invention, but is not limited to the listed models.
The first concentration sensor and the second concentration sensor can adopt MP-4 combustible gas sensors.
The current relay adopts an electromagnetic current relay, and can adopt a commercial GRM1555C1H300JZ01D type electromagnetic current relay.
The first air pump and the second air pump can adopt a commercial YT-10AVF air compressor.
The power supply adopts 220V mains supply.
The electric actuator adopts a JYL-100/200 fine-small electric actuator.
The volumes of the first gas tank and the second gas tank are about 180m, and a commercially available CRVZS-04 gas tank can be adopted.
The electric valve adopts a commercially available LDBAA electric flange ball valve.
The liquid separating tank adopts a commercial V301 acid gas liquid separating tank.
The gas holder may be a dry gas holder such as a Mo Ba double membrane gas holder commercially available.
As the burner, a commercially available RIELLO 40FS20 burner can be used.
The engine adopts a Stirling engine, and a V4-275 RMkIII Stirling engine can be adopted.
The generator adopts an OB2500JK3KW generator.
The water-sealed tank can be a commercially available DN-400 water-sealed tank.
The technical scheme of the invention is further described below with reference to fig. 2 and a specific embodiment.
The concentration of the discharged flare gas of a certain factory is between 5% and 40%, the optimal combustion concentration range of the flare gas is 15% to 30%, the main component of the flare gas is methane, and the gas outlet amount of a flare gas collecting pipe is 1 m/s. The volume of the first air storage tank 6 is 180 m; the concentration threshold value set by the first concentration sensor 1 is 30%, namely when the flare gas with the concentration higher than 30% is conveyed to the first gas storage tank 6 through a pipeline, the first concentration sensor 1 connected to the pipeline at the front end of the first gas storage tank 6 measures that the concentration value exceeds a specific threshold value by 30%, the first concentration sensor 1 correspondingly outputs a set current signal, the current signal is transmitted to the current relay 2, the current relay 2 is sucked to form a complete circuit, the power supply 4 starts to supply power to the motor, the first air pump 3 operates and inputs air to the first gas storage tank 6 through the pipeline connected to the first gas storage tank 6, the quantity of the air input to the first air pump 3 is set according to the actual condition of the plant, and the set value which can be used by the plant is between 0.35 m/s and 1 m/s; simultaneously with the operation of the first air pump 3, the electric actuator 5 of the electric valve connected in parallel with the first air pump synchronously starts to operate, and the electric valve 7 is controlled to be opened, so that the gas in the first gas storage tank 6 is output to the gas holder 10 through the electric valve 7.
If the input signal measured by the first concentration sensor 1 cannot reach the set threshold, namely, the gas concentration is lower than 30%, no current signal of the first concentration sensor 1 is transmitted to the electromagnetic current relay 2, the electromagnetic current relay 2 cannot be sucked, so that a working circuit is kept open, the power supply 4 cannot output current to the air pump 3 and the electric actuator 5 of the electric valve which are connected in parallel, therefore, the electric actuator 5 of the electric valve cannot drive the electric valve 7, the electric valve 7 is kept in a closed state, so that gas in the first air storage tank 6 is gradually accumulated, the gas pressure is gradually increased to finally break the water seal tank 14 and lead the gas to the liquid separation tank 8, the gas after liquid separation in the liquid separation tank 8 enters the pressure swing adsorption tower 9 through a pipeline, the purified combustible flare gas with higher concentration is led to the second air storage tank 15 through the pressure swing adsorption tower 9, the flare gas passes through the second concentration sensor 16 arranged on the pipeline in the transmission process of the section of the pipeline, the second concentration sensor 16 detects the concentration of the flare gas passing through the air pump and transmits concentration information to the control module 17, the control module 17 sends an instruction, and the gas with proper concentration is controlled by the control module 18 to the second air storage tank 15, and the combustible gas with proper concentration is properly diluted in the range of the second gas can be combusted in the second gas storage tank 15. For example, when the detected concentration is 90%, the control module sends out a command to enable the gas output by the air pump to be between 2 m/s and 5 m/s, so that the mixed gas concentration is kept in an optimal combustion concentration range interval of 15-30%. The gas mixed in the second gas tank 15 is outputted to the gas holder 10 through a pipe.
The gas holder 10 stores the flare gas with the concentration in the optimal combustion concentration range after the treatment, and transmits the gas to the combustor 11 through a pipeline for combustion heat release, the combustor 11 is connected with the engine 12, the heat energy generated by the combustion in the combustor 11 is converted into mechanical energy through the engine 12, the engine 12 is connected with the generator 13, and the mechanical energy generated by the engine 12 is finally converted into electric energy through the generator 13.
Experiments and experiments show that the flare gas recovery processing system for power generation can effectively recover flare gas and stably generate power, has higher automation degree in the whole process, contributes to power saving and energy saving, and is suitable for popularization and use.
Claims (9)
1. A flare gas recovery processing system for power generation, characterized by: the device comprises a flare gas collecting pipeline, a first gas storage tank, an electric valve, a gas holder and a linkage control circuit, wherein the flare gas collecting pipeline, the first gas storage tank, the electric valve and the gas holder are sequentially connected through pipelines; the linkage control circuit comprises a first concentration sensor, a current relay, a power supply, a first air pump and an electric actuator of an electric valve; the first concentration sensor measuring signal port is connected to a pipeline, close to the first air storage tank, of the flare gas collecting pipeline, the signal output end interface of the first concentration sensor is connected with a low-voltage control circuit of the current relay, the high-voltage working circuit of the current relay is connected with a first air pump and an electric actuator of an electric valve in parallel, and the air outlet of the first air pump is connected with the first air storage tank;
a low-concentration flare gas treatment pipeline is also connected between the first gas storage tank and the gas holder; the low-concentration flare gas treatment pipeline comprises a water sealed tank, a liquid separating tank, a pressure swing adsorption tower, a second concentration sensor, a control module, a second air pump and a second air storage tank, wherein the water sealed tank, the liquid separating tank, the pressure swing adsorption tower and the second air storage tank are sequentially connected; the measuring signal port of the second concentration sensor is arranged on a pipeline between the pressure swing adsorption tower and the second air storage tank; the information output port of the second concentration sensor is connected to the control module, the other end of the control module is connected with a control circuit of a second air pump, and the air outlet of the second air pump is connected with a second air storage tank;
the gas outlet of the gas cabinet is also connected with a gas power generation system; the gas power generation system at least comprises a combustor, an engine and a generator, wherein the combustor, the engine and the generator are sequentially connected through pipelines.
2. The flare gas recovery processing system for power generation of claim 1, wherein: the current relay adopts an electromagnetic current relay.
3. The flare gas recovery processing system for power generation of claim 1, wherein: the control module adopts a computer or a singlechip.
4. The flare gas recovery processing system for power generation of claim 1, wherein: the engine employs a Stirling engine.
5. The flare gas recovery processing system for power generation of claim 1, wherein: the first concentration sensor and the second concentration sensor adopt MP-4 combustible gas sensors.
6. The flare gas recovery processing system for power generation of claim 1, wherein: the first air pump and the second air pump adopt YT-10AVF air compressors.
7. The recovery processing method of a flare gas recovery processing system for power generation of claim 1, comprising the steps of:
1) The first concentration sensor detects the flare gas discharged by the flare gas collecting pipeline in real time, and when the first concentration sensor detects that the concentration of the discharged flare gas is higher than a preset threshold value, the step 2) is shifted to; otherwise, entering step 3);
2) The first concentration sensor sends an electric signal to the current relay; the current relay is attracted to enable the linkage control circuit to be connected, the first air pump is operated, air is output to the first air storage tank, and the air and the flare gas are mixed in the first air storage tank, so that the concentration of the flare gas is reduced; the electric valve actuator controls the electric valve to be opened, and the mixed gas is output to the gas holder through the electric valve;
3) When the concentration of the discharged flare gas is lower than a preset threshold value, the electric valve is closed, and the discharged flare gas is accumulated in the first gas storage tank, so that the pressure in the first gas storage tank is increased;
3-1) gradually increasing the gas pressure to finally break the water sealed tank, and entering the liquid separating tank;
3-2) the gas subjected to liquid separation in the liquid separation tank enters a pressure swing adsorption tower through a pipeline, the purification of the combustible flare gas is carried out in the pressure swing adsorption tower, and the purified combustible flare gas is led to a second gas storage tank along the pipeline;
3-3) a second concentration sensor mounted in the pipeline detects the concentration of the flammable flare gas in the pipeline between the pressure swing adsorption tower and the second gas storage tank and transmits concentration information to the control module;
3-4) the control module sends out instructions to the second air pump according to the input concentration information, controls the second air pump to introduce a proper amount of air into the second air storage tank, and controls the concentration of the combustible gas in the second air storage tank to be in an optimal combustion concentration range.
8. The recovery processing method of a flare gas recovery processing system for power generation according to claim 7, wherein the purification of the flammable flare gas in step 3-2) is followed by removal of N 2 And CO 2 To purify the combustible components in the flare gas.
9. The recovery processing method of a flare gas recovery processing system for power generation according to claim 7, wherein the optimal combustion concentration range in step 3-4), i.e., the mixed flare gas concentration, is 15% -30%, inclusive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811195523.0A CN109185901B (en) | 2018-10-15 | 2018-10-15 | Flare gas recycling system for power generation and recycling method thereof |
Applications Claiming Priority (1)
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