CN116379645A - Offshore platform low-grade energy recovery system - Google Patents
Offshore platform low-grade energy recovery system Download PDFInfo
- Publication number
- CN116379645A CN116379645A CN202310338224.2A CN202310338224A CN116379645A CN 116379645 A CN116379645 A CN 116379645A CN 202310338224 A CN202310338224 A CN 202310338224A CN 116379645 A CN116379645 A CN 116379645A
- Authority
- CN
- China
- Prior art keywords
- heat
- heat pump
- recovery system
- circulating water
- user
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Wind Motors (AREA)
Abstract
The invention discloses a low-grade energy recovery system for an offshore platform, which relates to the technical field of ocean engineering and comprises a heat pump, a closed circulating water cooling system, a waste heat recovery system, a heat user auxiliary heating system and a seawater cooling system. The system uses high-temperature heat medium oil generated by the waste heat recovery system as a driving heat source to drive the heat pump to work and absorb low-grade energy in the closed circulating water, so that the purpose of heating a heat user is realized. The auxiliary heating system of the heat user in the system can carry out auxiliary heating on the heat user under the condition of insufficient heating capacity of the heat pump; the seawater cooling system can realize auxiliary cooling of the closed circulating water under the condition of insufficient refrigerating capacity of the heat pump. The system not only can recycle low-temperature waste heat in the closed circulating water system, but also can reduce the load of the seawater cooling system so as to reduce the displacement of the seawater pump, so that the system can improve the utilization rate of the offshore platform energy source and reduce the energy consumption cost and the carbon emission.
Description
Technical Field
The invention relates to the technical field of ocean engineering, in particular to a low-grade energy recovery system of an offshore platform.
Background
Offshore platforms are used as the main carrier for offshore oil and gas production, which requires a great deal of energy consumption while maintaining the normal operation of the platform. Most production systems and living systems on a platform work normally by consuming electric energy, and a main power station formed by a turbine unit is established on the platform as one of main modes for providing electric energy for the main power station, and the main power station generates a large amount of high-temperature waste gas, namely a large amount of low-grade energy, while generating electricity. In order to ensure the normal operation of the platform, a closed circulating water cooling system is built on the platform to cool down cold users (such as high-temperature natural gas in mechanical equipment and a natural gas compression system, an air conditioning and refrigerating system in summer and the like). The closed circulating water is cooled for a cold user and the temperature of the closed circulating water is increased, so that the closed circulating water system is also a source of low-grade energy of an offshore platform; meanwhile, in order to ensure the normal circulation of the closed circulating water, the closed circulating water needs to be cooled by utilizing seawater. While the offshore platform generates a large amount of low-grade energy, a heating system (such as a heat medium boiler, an electric heater and the like) is also required to heat users (such as formation water, crude oil, a winter life building heating system and the like) on the platform.
In order to recycle the low-grade energy at sea and reduce the energy consumption of a platform, a great deal of researches are carried out by scientific researchers. And part of offshore platforms utilize heat medium oil to recover the energy of high-temperature flue gas in a mode of establishing a waste heat recovery system, and heat users on the platforms are heated in a heat exchange mode. Some researchers have proposed a technical scheme that the waste heat generated by a main power station is used for driving a first type of absorption heat pump to work, and the heat pump and an air conditioning system are comprehensively used for realizing offshore platform heating and refrigeration.
The two types of systems described above have the following problems: (1) The waste heat recovery system only recovers energy in high-temperature flue gas of the main power station, but does not recover low-grade energy in the closed circulating water cooling system. (2) According to the scheme of the combined use of the heat pump and the air conditioning system, when in refrigeration in summer, the system only utilizes the refrigeration capacity of the heat pump, and the heat pump absorbs heat in air so as to achieve the purpose of refrigeration. However, an additional heat-dissipating system is required to dissipate heat from the heat pump and to carry this part of the energy away from the platform via the sea water, so that the system reduces the load of the air conditioning system but increases the load of the sea water system. (3) The scheme of the combined use of the heat pump and the air conditioning system is that when heating in winter, the external environment temperature is lower, if the external environment is still used as a low-temperature waste heat source, the normal operation of the heat pump is not facilitated (the lower the waste heat temperature is, the higher the concentration of lithium bromide solution in the heat pump is, and then the risk of lithium bromide crystallization is increased).
Disclosure of Invention
The invention aims to solve the technical problem of providing a system for recovering low-grade energy of an offshore platform, heating a hot user and providing cold energy for a cold user.
In order to solve the technical problems, the invention provides an offshore platform low-grade energy recovery system which is communicated with a heat user and a cold user and comprises a heat pump, a closed circulating water cooling system and a waste heat recovery system, wherein the heat pump comprises an absorber, a condenser, an evaporator and a generator, the absorber and the condenser of the heat pump are communicated with the heat user, the evaporator of the heat pump is communicated with the closed circulating water cooling system, low-grade energy in liquid absorption closed circulating water in the evaporator is changed into water vapor, the temperature of the closed circulating water is reduced, the water vapor flows into the absorber, the water vapor is absorbed by solution in the absorber to release heat for the first heating of the heat user, the closed circulating water flows into the cold user for the cooling of the cold user, the generator of the heat pump is communicated with the waste heat recovery system, the heat of medium oil in the generator is evaporated to obtain water vapor, and the water vapor flows into the condenser to condense and release heat for the second heating of the heat user.
According to a preferred embodiment of the invention, the recovery system further comprises a heat user auxiliary heating system, wherein the heat user auxiliary heating system is communicated with the heat pump and the heat user, and is used for carrying out auxiliary heating on the heat user under the condition of insufficient heating capacity of the heat pump.
According to a preferred embodiment of the invention, the recovery system further comprises a seawater cooling system, wherein the seawater cooling system is communicated with the heat pump and the closed circulating water cooling system, and the auxiliary cooling of the closed circulating water cooling system is realized under the condition of insufficient refrigerating capacity of the heat pump.
According to a preferred embodiment of the invention, the heat user auxiliary heating system is communicated with the seawater cooling system and the heat pump through a plurality of pipelines, the pipelines are provided with valves, and the operation mode of the recovery system is switched by adjusting the opening and closing of the valves.
According to a preferred embodiment of the invention, the heat pump is an absorption heat pump of a first type.
According to a preferred embodiment of the invention, the absorber is provided with a heat user inlet from which the heat user flows into the heat pump.
According to a preferred embodiment of the invention, the condenser is provided with a heat user outlet from which the heat user flows out of the heat pump.
According to a preferred embodiment of the present invention, the generator is provided with a heat medium oil inlet through which the heat medium oil in the waste heat recovery system flows into the generator and a heat medium oil outlet through which the heat medium oil flows out of the generator.
According to a preferred embodiment of the invention, the evaporator is provided with a closed circulating water inlet and a closed circulating water outlet, and the closed circulating water in the closed circulating water cooling system flows into the evaporator through the closed circulating water inlet and flows out of the evaporator through the closed circulating water outlet.
The invention has the technical effects that:
1. the offshore platform low-grade energy recovery system further recycles the low-grade waste heat of the offshore platform on the basis of the existing offshore platform waste heat recovery system, and uses the driving heat source provided by the waste heat recovery system and the low-temperature waste heat in the closed circulating water cooling system as heat sources to heat or preheat heat users, and the closed circulating water temperature is reduced to flow into cold users to cool the cold users, so that the beneficial effects of recycling low-grade energy, heating the heat users and providing cold energy for the cold users are realized.
2. According to the offshore platform low-grade energy recovery system, the low-grade energy absorbed by the heat pump is utilized for heating by a heat user, so that the utilization rate of the offshore platform energy is improved, and the energy consumption cost and the carbon emission are reduced; the load of the seawater cooling system is reduced after the heat pump absorbs low-temperature waste heat in the closed circulating water cooling system, so that the displacement of the seawater pump is reduced; the temperature change range of the closed circulating water cooling system is enlarged, the flow of the closed circulating water cooling system is reduced, the size of the heat exchanger is reduced, and the degree of freedom of system design is enlarged.
3. According to the offshore platform low-grade energy recovery system, the working mode of the system can be adjusted according to the requirements by controlling the opening and closing of the pipeline valve, so that the applicability and the operation effect of the system are improved.
Drawings
FIG. 1 is an overall schematic of the offshore platform low grade energy recovery system of the present invention;
FIG. 2 is a schematic diagram of the offshore platform low grade energy recovery system heat pump of the present invention.
Reference numerals: 1-cold user; 2-hot users; 3-valve H1; 4-valve H2; 5-a heat user assisted heating system; 6-valve H3; 7-valve H4; 8-a waste heat recovery system; 9-a main engine smoke flow path; 10-a heat medium oil flow path; 11-valve H5; 12-a heat pump; 13-valve H6; 14-valve C1; 15-valve C2; 16-valve C3; 17-a heat exchanger; 18-a seawater flow path; 19-a seawater cooling system; 20-valve C4; 21-valve C5; 22-valve C6; 23-a closed circulating water cooling system; 24-a closed circulating water flow path; 25-generator; 26-a heat medium oil outlet; 27-a thermal medium oil inlet; 28-heat exchanger; 29-hot user portal; a 30-absorber; 31-a closed circulating water inlet; 32-a closed circulating water outlet; 33-an evaporator; 34-hot user outlet; 35-condenser.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
As shown in fig. 1 and 2, the low-grade energy recovery system of the offshore platform is communicated with the heat consumer 2 and the cold consumer 1, and comprises a heat pump 12, a closed circulating water cooling system 23 and a waste heat recovery system 8, wherein the heat pump 12 comprises an absorber 30, a condenser 35, an evaporator 33 and a generator 25, the absorber 30 and the condenser 35 of the heat pump 12 are communicated with the heat consumer 2, the evaporator 33 of the heat pump 12 is communicated with the closed circulating water cooling system 23, the low-grade energy in the liquid in the evaporator 33 absorbs the closed circulating water cooling system 23 and becomes water vapor, the temperature of the closed circulating water in the closed circulating water cooling system 23 is reduced, the water vapor flows into the absorber 30 and is absorbed by the solution in the absorber 30 to release heat for the first heating of the heat consumer 2, the closed circulating water flows into the cold consumer 1 to cool the heat consumer 1, the generator 25 of the heat pump 12 is communicated with the waste heat recovery system 8, the heat of the liquid in the waste heat absorbing and recovering system 8 evaporates the water vapor of the second-temperature medium oil, the water vapor flows into the condenser 35 to condense and releases the heat for the second heating of the consumer 2.
As shown in figure 1, the invention mainly comprises five systems, namely a heat user auxiliary heating system 5, a waste heat recovery system 8, a first type absorption heat pump 12, a seawater cooling system 19 and a closed circulating water cooling system 23, wherein the five systems are connected through pipelines to realize heat exchange, and valves are arranged on the pipelines to realize different working modes.
As shown in fig. 1 and 2, the heat consumer 2 flows into the heat pump 12 from the heat consumer inlet 29 at the absorber 30, flows out of the heat pump 12 from the heat consumer outlet 34 at the condenser 35, and the heat consumer 2 heats up first at the absorber 30 and second at the condenser 35; the high-temperature heat medium oil generated by the waste heat recovery system 8 flows into the generator 25 through the heat medium oil inlet 27 and flows out of the generator 25 through the heat medium oil outlet 26; the dilute solution in the generator 25 absorbs heat in the heat medium oil, and vapor evaporated from the heat medium oil flows into the condenser 35, and high-temperature concentrated solution generated after the vapor evaporation flows into the absorber 30 through the heat exchanger 28; the water vapor flowing into the condenser 35 is condensed into water in the condenser 35 to release heat for secondary heating of the heat user 2, and the condensed water enters the low-pressure environment evaporator 33 through the throttle valve; the closed circulating water flows into the evaporator 33 through the closed circulating water inlet 31 and flows out of the evaporator 33 through the closed circulating water outlet 32; the condensed water in the evaporator 33 absorbs low-grade waste heat in the closed circulating water under a low-pressure environment to become water vapor, and flows into the absorber 30; the concentrated solution in the absorber 30 absorbs the heat released by the water vapor to heat the heat consumer 2 for the first time, and the concentrated solution after the water vapor absorption is changed into a dilute solution, and flows into the generator 25 through the heat exchanger 28 to complete the whole cycle.
The auxiliary heating system 5 for the heat user is responsible for carrying out auxiliary heating on the heat user when the heat pump 12 generates insufficient heat; the seawater cooling system 19 is responsible for cooling the closed-cycle water when the heat pump 12 is insufficient in refrigerating capacity. Different connection modes between the auxiliary heating system 5 and the heat pump 12 and between the seawater cooling system 19 and the heat pump 12 of the heat user are realized by opening and closing valves in the pipelines, so that different working modes of the system are realized.
Working mode 1: valve H1 3, valve H2 4, valve H3 6, valve H4 7, valve C1 14, valve C2 15 and valve C5 are opened, and the rest of valves are closed, at this time, the heat pump 12 is connected with the auxiliary heating system 5 of the heat user in parallel, a part of the heat users 2 flow into the heat pump 12 for heating, and the rest of the heat users 2 flow into the auxiliary heating system 5 of the heat user for heating; the heat pump 12 is connected in series with a seawater cooling system 19, and the closed circulating water is cooled by seawater and then flows into the heat pump 12 for secondary cooling.
Working mode 2: valve H1 3, valve H3 6, valve H5, valve C1 14, valve C2 15 and valve C5 21 are opened, and the rest valves are closed, at this time, the heat pump 12 is connected with the auxiliary heating system 5 of the heat user in series, and the heat user 2 flows into the heat pump 12 for preheating and then flows into the auxiliary heating system 5 of the heat user for heating to the appointed temperature; the heat pump 12 is connected in series with a seawater cooling system 19, and the closed circulating water is cooled by seawater and then flows into the heat pump 12 for secondary cooling.
Working mode 3: valve H2 4, valve H4 7, valve H6 13, valve C1 14, valve C2 15 and valve C5 are opened, and the rest valves are closed, at this time, the heat pump 12 is connected with the auxiliary heating system 5 of the heat user in series, and the heat user 2 flows into the auxiliary heating system 5 of the heat user for preheating and then flows into the heat pump 12 for heating to the designated temperature; the heat pump 12 is connected in series with a seawater cooling system 19, and the closed circulating water is cooled by seawater and then flows into the heat pump 12 for secondary cooling.
Working mode 4: valve H1 3, valve H2 4, valve H3 6, valve H4 7, valve C3 16, valve C4 and valve C6 are opened, and the rest of valves are closed, at this time, the heat pump 12 is connected with the auxiliary heating system 5 of the heat user in parallel, a part of heat users 2 flow into the heat pump 12 for heating, and the rest of heat users 2 flow into the auxiliary heating system 5 of the heat user for heating; the heat pump 12 is connected in series with a seawater cooling system 19, and the closed circulating water flows into the heat pump 12 for cooling and then is cooled by seawater.
Working mode 5: valve H1 3, valve H2 4, valve H3 6, valve H4 7, valve C1 14, valve C3 16, valve C5 and valve C6 22 are opened, and the rest of valves are closed, at this time, the heat pump 12 is connected with the auxiliary heating system 5 of the heat user in parallel, a part of the heat users 2 flow into the heat pump 12 for heating, and the rest of the heat users 2 flow into the auxiliary heating system 5 of the heat user for heating; the heat pump 12 is connected in parallel with the seawater cooling system 19, a part of the closed circulating water is cooled by the heat pump 12, and the rest of the closed circulating water is cooled by the seawater.
Working mode 6: valve H2 4, valve H3 6, valve C3 and valve C5 are opened, the rest valves are closed, at this time, the heat pump 12 does not participate in the work, the heat user 2 is heated by the heat user auxiliary heating system 5, and the closed circulating water is cooled by the sea water. This mode of operation maintains the platform in normal operation while the heat pump 12 is serviced.
The above-described embodiments are merely preferred embodiments for fully explaining the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutions and modifications will occur to those skilled in the art based on the present invention, and are intended to be within the scope of the present invention. The protection scope of the invention is subject to the claims.
Claims (9)
1. The utility model provides an offshore platform low-grade energy recovery system, is linked together in heat user and cold user, includes heat pump, closed circulation water cooling system and waste heat recovery system, its characterized in that, the heat pump includes absorber, condenser, evaporimeter and generator, the absorber and the condenser of heat pump are linked together in the heat user, the evaporimeter of heat pump linked together in closed circulation water cooling system, the low-grade energy in the liquid absorption closed circulation water in the evaporimeter closed circulation water cooling system becomes vapor and closed circulation water temperature reduces, and vapor inflow the absorber and by the solution absorption in the absorber give off heat for the heat user carries out the first heating, and closed circulation water inflow is cold user for the cooling of cold user, the generator of heat pump linked together in waste heat recovery system, the liquid absorption waste heat recovery system in the generator the heat medium oil's heat evaporation vapor, vapor inflow condenser condensation and release heat for the heat user carries out the second heating.
2. The offshore platform low grade energy recovery system of claim 1, further comprising a heat consumer auxiliary heating system in communication with the heat pump and the heat consumer for auxiliary heating of the heat consumer in the event of insufficient heating capacity of the heat pump.
3. The offshore platform low-grade energy recovery system of claim 2, wherein the recovery system further comprises a seawater cooling system, the seawater cooling system is communicated with the heat pump and the closed circulating water cooling system, and the auxiliary cooling of the closed circulating water cooling system is realized under the condition of insufficient refrigerating capacity of the heat pump.
4. The offshore platform low-grade energy recovery system of claim 3, wherein the heat user auxiliary heating system is communicated with the seawater cooling system and the heat pump through a plurality of pipelines, the pipelines are provided with valves, and the operation modes of the recovery system are switched by adjusting the opening and closing of the valves.
5. The offshore platform low grade energy recovery system of claim 1, wherein the heat pump is a first type of absorption heat pump.
6. The offshore platform low grade energy recovery system of claim 1, wherein the absorber is provided with a heat user inlet from which heat users flow into the heat pump.
7. The offshore platform low grade energy recovery system of claim 1, wherein the condenser is provided with a heat user outlet from which the heat user flows out of the heat pump.
8. The offshore platform low grade energy recovery system of claim 1, wherein the generator is provided with a thermal medium oil inlet and a thermal medium oil outlet, the thermal medium oil in the waste heat recovery system flowing into the generator from the thermal medium oil inlet and out of the generator from the thermal medium oil outlet.
9. The offshore platform low grade energy recovery system of claim 1, wherein the evaporator is provided with a closed circulating water inlet and a closed circulating water outlet, and the closed circulating water in the closed circulating water cooling system flows into the evaporator through the closed circulating water inlet and flows out of the evaporator through the closed circulating water outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310338224.2A CN116379645A (en) | 2023-03-31 | 2023-03-31 | Offshore platform low-grade energy recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310338224.2A CN116379645A (en) | 2023-03-31 | 2023-03-31 | Offshore platform low-grade energy recovery system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116379645A true CN116379645A (en) | 2023-07-04 |
Family
ID=86965094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310338224.2A Pending CN116379645A (en) | 2023-03-31 | 2023-03-31 | Offshore platform low-grade energy recovery system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116379645A (en) |
-
2023
- 2023-03-31 CN CN202310338224.2A patent/CN116379645A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101963412B (en) | Solar energy and electric energy combined heat pump system and cooling and heating method | |
| CN107100807B (en) | Direct contact heat exchange tower type solar thermal power station system and working method thereof | |
| CN101509716A (en) | Electric power plant cooling system for enhancing cooling efficiency by utilizing residual heat refrigeration manner | |
| CN103292513B (en) | Driven by Solar Energy list economic benefits and social benefits coupled mode lithium bromide refrigerator | |
| CN201819480U (en) | High-efficiency and energy-saving heat pump device | |
| CN107940789B (en) | A kind of cool and thermal power combined generating system based on movable solar energy heat collector | |
| CN102997482B (en) | Direct-fired lithium bromide absorption cold-hot water unit for recovering flue gas waste heat under heating working condition | |
| CN201705400U (en) | Power plant cooling system adopting waste heat refrigeration form to increase cooling efficiency | |
| CN103727703A (en) | Recycling combined cooling heating and power system | |
| CN101793447A (en) | Cold-heat combined supply solar thermochemical adsorption composite energy storing device | |
| CN219454309U (en) | Solar energy-geothermal energy coupling cascade type Rankine cycle combined heat and power generation system | |
| CN203011002U (en) | Direct-fired lithium bromide absorption type heating and refrigerating unit with smoke valve and used for recovering smoke waste heat | |
| CN114135398A (en) | Gas turbine combined cycle power generation system and method under distributed energy environment | |
| CN108317769B (en) | thermoelectric synergistic energy storage type absorption-adsorption cascade multi-effect refrigeration system | |
| CN113775492A (en) | CO of sharing equipment2Brayton and heat pump combined cycle system and operation method | |
| CN203010995U (en) | Direct-fired lithium bromide absorption type cold and hot water unit for recovering flue gas waste heat | |
| CN101093118B (en) | Single stage composite absorption type compressor | |
| CN208108536U (en) | A kind of low temperature exhaust heat reclaiming type lithium bromide absorption cold and hot water system | |
| CN106287918A (en) | A kind of across solar energy storage heating system and control method thereof in season | |
| CN110513759A (en) | A kind of extremely frigid zones solar heat pump energy storage heating system and the method for operation | |
| CN116379645A (en) | Offshore platform low-grade energy recovery system | |
| CN215002381U (en) | High-efficient absorption heat pump | |
| CN211695946U (en) | Waste heat recycling device | |
| CN210013728U (en) | Closed circulation power generation system of integrated absorption heat pump | |
| CN104482690B (en) | A kind of absorption geothermal heat pump utilizing solar heat to drive |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |