阅读说明：本技术 一种复合吸收式制冷与有机朗肯循环的co2增压储存装置 (CO of composite absorption refrigeration and organic Rankine cycle2Pressure-increasing storage device ) 是由 张荻 孟玥 谢永慧 孙磊 王鼎 于 2021-09-29 设计创作，主要内容包括：本发明公开了一种复合吸收式制冷与有机朗肯循环的CO-(2)增压储存装置,包括二氧化碳增压储存部分、吸收式制冷部分和有机朗肯循环部分。本发明将有机朗肯循环系统引入传统封存过程,能够利用有机朗肯循环系统中动力透平产生的动能驱动封存过程的压缩机进行工作,不需要耗费电网电能,有效提升了封存过程的效率。(The invention discloses CO of composite absorption refrigeration and organic Rankine cycle 2 The pressurized storage device comprises a carbon dioxide pressurized storage part, an absorption refrigeration part and an organic Rankine cycle part. According to the invention, the organic Rankine cycle system is introduced into the traditional sealing process, the kinetic energy generated by the power turbine in the organic Rankine cycle system can be used for driving the compressor in the sealing process to work, the electric energy of a power grid is not required to be consumed, and the efficiency of the sealing process is effectively improved.)

1. CO of composite absorption refrigeration and organic Rankine cycle₂The pressurized storage device is characterized by comprising a carbon dioxide pressurized storage part, an absorption refrigeration part and an organic Rankine cycle part;

the carbon dioxide boosting and storing part comprises a carbon dioxide primary compressor, the outlet of the carbon dioxide primary compressor is connected to the first inlet of a carbon dioxide primary interstage heat exchanger, the first outlet of the carbon dioxide primary interstage heat exchanger is connected to the inlet of a carbon dioxide secondary compressor, the outlet of the carbon dioxide secondary compressor is connected to the first inlet of the carbon dioxide secondary interstage heat exchanger, the first outlet of the carbon dioxide secondary interstage heat exchanger is connected to the inlet of a carbon dioxide tertiary compressor, the outlet of the carbon dioxide tertiary compressor is connected to the first inlet of the carbon dioxide tertiary interstage heat exchanger, the outlet of the carbon dioxide tertiary interstage heat exchanger is connected to the inlet of a carbon dioxide quaternary compressor, the first outlet of the carbon dioxide quaternary compressor is connected to the first inlet of a carbon dioxide condenser, and the first outlet of the carbon dioxide condenser is connected to the inlet of a carbon dioxide high-pressure compressor, the outlet of the carbon dioxide high-pressure compressor is connected to a carbon dioxide high-pressure storage tank to complete the compression and storage of carbon dioxide;

the absorption refrigeration part comprises a refrigerant absorber, wherein the outlet of the refrigerant absorber is connected to the inlet of a refrigerant booster pump, the outlet of the refrigerant booster pump is connected to the first inlet of a refrigerant steam generator, the first outlet of the refrigerant steam generator is connected to the inlet of a first throttle expansion valve, and the outlet of the first throttle expansion valve is connected to the first inlet of the refrigerant absorber; the third outlet of the refrigerant steam generator is connected to the inlet of the refrigerant condenser, the outlet of the refrigerant condenser is connected to the inlet of the second throttle expansion valve, the outlet of the second throttle expansion valve is connected to the first inlet of the refrigerant evaporator, and the first outlet of the refrigerant evaporator is connected to the second inlet of the refrigerant absorber, so that the evaporation, heat absorption and storage of the refrigerant are completed; an outlet of the first cooling working medium storage tank is connected to an inlet of the cooling working medium booster pump, an outlet of the cooling working medium booster pump is connected to a second inlet of the refrigerant evaporator, a second outlet of the refrigerant evaporator is connected to a second inlet of the carbon dioxide condenser, and a second outlet of the carbon dioxide condenser is connected to an inlet of the cooling working medium storage tank; an outlet of the cooling working medium second storage tank is connected to an inlet of a cooling working medium second booster pump, an outlet of the cooling working medium second booster pump is respectively connected with second inlets of the carbon dioxide primary interstage heat exchanger, the carbon dioxide secondary interstage heat exchanger and the carbon dioxide tertiary interstage heat exchanger, second outlets of the carbon dioxide primary interstage heat exchanger, the carbon dioxide secondary interstage heat exchanger and the carbon dioxide tertiary interstage heat exchanger are connected with a second inlet of the refrigerant steam generator, and a second outlet of the refrigerant steam generator is connected with a cooling working medium second storage tank to finish heat release and heat absorption of the cooling working medium;

the organic Rankine cycle part comprises an organic working medium power turbine, an outlet of the organic working medium power turbine is connected with an inlet of an organic working medium condenser, an outlet of the organic working medium condenser is connected with an inlet of an organic working medium first booster pump, an outlet of the organic working medium first booster pump is connected with a first inlet of an organic working medium first evaporator, a first outlet of the organic working medium first evaporator is connected with an inlet of an organic working medium second booster pump, an outlet of the organic working medium second booster pump is connected with a first inlet of an organic working medium second evaporator, and a first outlet of the organic working medium second evaporator is connected with a first inlet of the organic working medium power turbine; a third outlet of the organic working medium first evaporator is connected to a second inlet of the organic working medium power turbine to complete Rankine cycle work of the organic working medium; the second inlet of the organic working medium second evaporator is connected with the industrial waste heat, the second outlet of the organic working medium second evaporator is connected with the second inlet of the organic working medium first evaporator, the second outlet of the organic working medium first evaporator is connected with the fourth inlet of the refrigerant steam generator, and the fourth outlet of the refrigerant steam generator is connected with the industrial waste heat, so that the three-stage cascade utilization of the industrial waste heat is completed.

2. The CO of claim 1 for a combined absorption refrigeration and organic rankine cycle₂Pressurized storage device, characterized in thatIn the absorption refrigerating part, the refrigerant may be selected from ammonia-water working medium pair or water-lithium bromide working medium pair.

3. The CO of claim 1 for a combined absorption refrigeration and organic rankine cycle₂The pressurized storage device is characterized in that the cooling working medium of the absorption refrigeration part is water or heat conducting oil.

4. The CO of claim 1 for a combined absorption refrigeration and organic rankine cycle₂The pressurized storage device is characterized in that isobutene or R134a is selected as the organic working medium of the organic Rankine cycle part.

5. The CO of claim 1 for a combined absorption refrigeration and organic rankine cycle₂The supercharging storage device is characterized in that the heat of industrial waste heat input into the refrigerant steam generator 13 is adjusted according to the requirement, and the adjustment of the refrigerating capacity of the absorption refrigeration cycle is realized.

6. The CO of claim 1 for a combined absorption refrigeration and organic rankine cycle₂The pressurizing storage device is characterized in that the inlet pressure of a carbon dioxide first-stage compressor 01 is 0.18MPa, the outlet pressure of a carbon dioxide fourth-stage compressor 04 is 4.5MPa, the outlet pressure of a carbon dioxide high-pressure compressor 09 is 15MPa, and the pressure of a carbon dioxide high-pressure storage tank 10 is 15 MPa.

7. The CO of claim 1 for a combined absorption refrigeration and organic rankine cycle₂The pressurized storage device is characterized in that the carbon dioxide is carbon dioxide separated from industrial tail gas, conventional power plant coal-fired exhaust or gas turbine exhaust.

8. The CO of claim 1 for a combined absorption refrigeration and organic rankine cycle₂The pressurizing storage device is characterized in that the organic working medium second evaporator and the organic working medium first evaporatorThe heat used in the unit 25 and the refrigerant steam generator can be gas turbine exhaust gas or geothermal heat, in addition to industrial waste heat.

9. The CO of claim 1 for a combined absorption refrigeration and organic rankine cycle₂A pressurized storage device, characterized in that a high pressure storage tank for carbon dioxide can be an oil well formation, and high pressure carbon dioxide can be stored in the oil well for enhanced oil recovery.

Technical Field

The invention belongs to the technical field of carbon dioxide pressurization storage, and particularly relates to CO of composite absorption refrigeration and organic Rankine cycle₂A pressurized storage device.

Background

Carbon capture and sequestration technology (CO)₂Capture and Storage, CCS) is currently the major route to mitigate global warming from greenhouse gases, which includes three parts of separation, transport, and sequestration of carbon dioxide from emissions sources. At present, the main power generation mode in China is thermal power, and due to the fact that the carbon dioxide emission amount is high, a thermal power station is considered to be one of the most suitable targets of a carbon capture and sequestration technology.

The carbon capture and sequestration technology can be divided into three processes of capture, transportation and sequestration, wherein the sequestration process usually needs to compress carbon dioxide from a state close to normal pressure to an ultrahigh pressure state, and the pressure ratio is very high. Therefore, a large amount of compression work is consumed in the traditional sequestration process, and the part of the consumed power needs to be obtained from a power grid or other ways, so that the whole process is low in efficiency and high in power consumption. In addition, in part of the prior art, the pressure of carbon dioxide is directly increased, and the carbon dioxide is directly compressed from a gaseous state to a supercritical state for storage, so that a system needs to consume a large amount of compression work.

Aiming at the defects of the existing sealing process, the invention combines the existing engineering practice to provide CO of composite absorption refrigeration and organic Rankine cycle₂The pressurizing storage device utilizes industrial waste heat to complement the energy in the system, and utilizes absorption refrigeration to condense, and has the advantages of high efficiency, high energy utilization rate and the like.

Disclosure of Invention

The invention aims to provide CO of a composite absorption refrigeration and organic Rankine cycle₂Pressurized storage devices to address one or more of the above-identified technical problems. The device designed by the invention can effectively improve the efficiency of the carbon dioxide sequestration process, improve the energy utilization rate and reuse the industrial waste heat.

In order to achieve the purpose, the invention adopts the following technical scheme:

CO of composite absorption refrigeration and organic Rankine cycle₂The pressurized storage device comprises a carbon dioxide pressurized storage part, an absorption refrigeration part and an organic Rankine cycle part;

the carbon dioxide boosting and storing part comprises a carbon dioxide primary compressor, the outlet of the carbon dioxide primary compressor is connected to the first inlet of a carbon dioxide primary interstage heat exchanger, the first outlet of the carbon dioxide primary interstage heat exchanger is connected to the inlet of a carbon dioxide secondary compressor, the outlet of the carbon dioxide secondary compressor is connected to the first inlet of the carbon dioxide secondary interstage heat exchanger, the first outlet of the carbon dioxide secondary interstage heat exchanger is connected to the inlet of a carbon dioxide tertiary compressor, the outlet of the carbon dioxide tertiary compressor is connected to the first inlet of the carbon dioxide tertiary interstage heat exchanger, the outlet of the carbon dioxide tertiary interstage heat exchanger is connected to the inlet of a carbon dioxide quaternary compressor, the first outlet of the carbon dioxide quaternary compressor is connected to the first inlet of a carbon dioxide condenser, and the first outlet of the carbon dioxide condenser is connected to the inlet of a carbon dioxide high-pressure compressor, the outlet of the carbon dioxide high-pressure compressor is connected to a carbon dioxide high-pressure storage tank to complete the compression and storage of carbon dioxide;

the absorption refrigeration part comprises a refrigerant absorber, wherein the outlet of the refrigerant absorber is connected to the inlet of a refrigerant booster pump, the outlet of the refrigerant booster pump is connected to the first inlet of a refrigerant steam generator, the first outlet of the refrigerant steam generator is connected to the inlet of a first throttle expansion valve, and the outlet of the first throttle expansion valve is connected to the first inlet of the refrigerant absorber; the third outlet of the refrigerant steam generator is connected to the inlet of the refrigerant condenser, the outlet of the refrigerant condenser is connected to the inlet of the second throttle expansion valve, the outlet of the second throttle expansion valve is connected to the first inlet of the refrigerant evaporator, and the first outlet of the refrigerant evaporator is connected to the second inlet of the refrigerant absorber, so that the evaporation, heat absorption and storage of the refrigerant are completed; an outlet of the first cooling working medium storage tank is connected to an inlet of the cooling working medium booster pump, an outlet of the cooling working medium booster pump is connected to a second inlet of the refrigerant evaporator, a second outlet of the refrigerant evaporator is connected to a second inlet of the carbon dioxide condenser, and a second outlet of the carbon dioxide condenser is connected to an inlet of the cooling working medium storage tank; an outlet of the cooling working medium second storage tank is connected to an inlet of a cooling working medium second booster pump, an outlet of the cooling working medium second booster pump is respectively connected with second inlets of the carbon dioxide primary interstage heat exchanger, the carbon dioxide secondary interstage heat exchanger and the carbon dioxide tertiary interstage heat exchanger, second outlets of the carbon dioxide primary interstage heat exchanger, the carbon dioxide secondary interstage heat exchanger and the carbon dioxide tertiary interstage heat exchanger are connected with a second inlet of the refrigerant steam generator, and a second outlet of the refrigerant steam generator is connected with a cooling working medium second storage tank to finish heat release and heat absorption of the cooling working medium;

the organic Rankine cycle part comprises an organic working medium power turbine, an outlet of the organic working medium power turbine is connected with an inlet of an organic working medium condenser, an outlet of the organic working medium condenser is connected with an inlet of an organic working medium first booster pump, an outlet of the organic working medium first booster pump is connected with a first inlet of an organic working medium first evaporator, a first outlet of the organic working medium first evaporator is connected with an inlet of an organic working medium second booster pump, an outlet of the organic working medium second booster pump is connected with a first inlet of an organic working medium second evaporator, and a first outlet of the organic working medium second evaporator is connected with a first inlet of the organic working medium power turbine; a third outlet of the organic working medium first evaporator is connected to a second inlet of the organic working medium power turbine to complete Rankine cycle work of the organic working medium; the second inlet of the organic working medium second evaporator is connected with the industrial waste heat, the second outlet of the organic working medium second evaporator is connected with the second inlet of the organic working medium first evaporator, the second outlet of the organic working medium first evaporator is connected with the fourth inlet of the refrigerant steam generator, and the fourth outlet of the refrigerant steam generator is connected with the industrial waste heat, so that the three-stage cascade utilization of the industrial waste heat is completed.

In a further development of the invention, the refrigerant of the absorption refrigeration part can be selected from an ammonia-water working substance pair or a water-lithium bromide working substance pair.

The invention is further improved in that the cooling working medium of the absorption refrigeration part is selected from water or heat conducting oil.

In a further development of the invention, the organic working medium of the organic rankine cycle part is isobutene or R134 a.

The further improvement of the invention is that the heat quantity of the industrial waste heat input into the refrigerant steam generator 13 is adjusted according to the requirement, so as to realize the adjustment of the refrigerating capacity of the absorption refrigeration cycle.

The invention has the further improvement that the inlet pressure of the carbon dioxide first-stage compressor 01 is 0.18MPa, the outlet pressure of the carbon dioxide fourth-stage compressor 04 is 4.5MPa, the outlet pressure of the carbon dioxide high-pressure compressor 09 is 15MPa, and the pressure of the carbon dioxide high-pressure storage tank 10 is 15 MPa.

The invention is further improved in that the carbon dioxide is carbon dioxide separated from industrial tail gas, conventional power plant coal-fired exhaust or gas turbine exhaust.

The further improvement of the invention is that the heat utilized in the organic working medium second evaporator, the organic working medium first evaporator 25 and the refrigerant steam generator can utilize the exhaust gas and terrestrial heat of the gas turbine besides the industrial waste heat.

A further improvement of the invention is that the high pressure storage tank for carbon dioxide can be an oil well formation and high pressure carbon dioxide can be stored in the oil well for enhanced oil recovery.

The invention has at least the following beneficial technical effects:

according to the invention, the organic Rankine cycle system is introduced into the traditional sealing process, the kinetic energy generated by the power turbine in the organic Rankine cycle system can be used for driving the compressor in the sealing process to work, the electric energy of a power grid is not required to be consumed, and the efficiency of the sealing process is effectively improved;

furthermore, aiming at the carbon dioxide sequestration process, the carbon dioxide is firstly condensed and then directly compressed to the supercritical state, compared with the method of directly compressing the carbon dioxide to the supercritical state from the gaseous state, the consumed compression work is smaller, and the energy is saved;

furthermore, industrial waste heat or other low-grade heat is used as a heat source of the organic Rankine cycle and the absorption refrigeration cycle, so that a three-level gradient utilization mode of the waste heat is realized, and the energy utilization rate is effectively improved;

furthermore, the organic Rankine cycle and the absorption refrigeration cycle are combined, and the quantity and the sequence of the industrial waste heat in the organic Rankine cycle and the absorption refrigeration cycle can be adjusted according to specific engineering conditions, so that the energy utilization rate is further improved, the flexible peak regulation is realized, and various composite requirements are met;

furthermore, the heat generated by compressing the carbon dioxide is used as a heat source of the absorption refrigeration cycle, so that the energy is recycled, the energy consumption is reduced, and the energy utilization rate is further improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art are introduced below. It is obvious that the drawings described below are embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

FIG. 1 shows a CO of a combined absorption refrigeration and organic Rankine cycle according to an embodiment of the present invention₂Schematic of a pressurized storage device:

description of reference numerals:

01. a carbon dioxide primary compressor; 02. a carbon dioxide secondary compressor; 03. a carbon dioxide tertiary compressor; 04. a carbon dioxide four-stage compressor; 05. a carbon dioxide primary interstage heat exchanger; 06. a carbon dioxide secondary interstage heat exchanger; 07. a carbon dioxide tertiary interstage heat exchanger; 08. a carbon dioxide condenser; 09. a carbon dioxide high pressure compressor; 10. a carbon dioxide high pressure storage tank; 11. a refrigerant absorber; 12. a refrigerant booster pump; 13. a refrigerant vapor generator; 14. a first throttle expansion valve; 15. a refrigerant condenser; 16. a second throttle expansion valve; 17. a refrigerant evaporator; 18. a first storage tank for cooling working medium; 19. a first booster pump for cooling working medium; 20. a second storage tank for cooling working medium; 21. a second booster pump for cooling working medium; 22. an organic working medium turbine; 23. an organic working medium condenser; 24. a first organic working medium booster pump; 25. a first evaporator of organic working medium; 26. a second organic working medium booster pump; 27. and a second evaporator of organic working medium.

Detailed Description

In order to make the purpose, technical effect and technical solution of the embodiments of the present invention clearer, the following describes the technical solution of the embodiments of the present invention completely with reference to the drawings in the embodiments of the present invention; it will be apparent that the described embodiments are part of an embodiment of the invention. Other embodiments, which can be derived by one of ordinary skill in the art from the disclosed embodiments without inventive faculty, are intended to be within the scope of the invention.

Referring to FIG. 1, a CO of a combined absorption refrigeration and organic Rankine cycle is shown in an embodiment of the present invention₂A pressurized storage device, comprising: the system comprises a carbon dioxide first-stage compressor 01, a carbon dioxide second-stage compressor 02, a carbon dioxide third-stage compressor 03 and a carbon dioxide fourth-stage compressor 04; a carbon dioxide primary interstage heat exchanger 05, a carbon dioxide secondary interstage heat exchanger 06, a carbon dioxide tertiary interstage heat exchanger 07; a carbon dioxide condenser 08; a carbon dioxide high pressure compressor 09; a carbon dioxide high pressure storage tank 010; a refrigerant absorber 11; a refrigerant booster pump 12; a refrigerant vapor generator 13; a first throttle expansion valve 14; a refrigerant condenser 15; a second throttle expansion valve 16; a refrigerant evaporator 17; a first storage tank 18 for cooling medium; a first booster pump 19 for cooling working medium; a second storage tank 20 for cooling medium; a cooling working medium second booster pump 21; an organic working medium power turbine 22; an organic working medium condenser 23; a first booster pump 24 of organic working medium; a first evaporator 25 of organic working medium; a second booster pump 26 of organic working medium; and an organic working medium second evaporator 27.

An outlet of the carbon dioxide primary compressor 01 is connected to a first inlet of a carbon dioxide primary interstage heat exchanger 05, a first outlet of the carbon dioxide primary interstage heat exchanger 05 is connected to an inlet of a carbon dioxide secondary compressor 02, an outlet of the carbon dioxide secondary compressor 02 is connected to a first inlet of a carbon dioxide secondary interstage heat exchanger 06, a first outlet of the carbon dioxide secondary interstage heat exchanger 06 is connected to an inlet of a carbon dioxide tertiary compressor 03, an outlet of the carbon dioxide tertiary compressor 03 is connected to a first inlet of a carbon dioxide tertiary interstage heat exchanger 07, a first outlet of the carbon dioxide tertiary interstage heat exchanger 07 is connected to an inlet of a carbon dioxide quaternary compressor 04, an outlet of the carbon dioxide quaternary compressor 04 is connected to a first inlet of a carbon dioxide condenser 08, a first outlet of the carbon dioxide condenser 08 is connected to an inlet of a carbon dioxide high pressure compressor 09, an outlet of the carbon dioxide high pressure compressor 09 is connected to a carbon dioxide high pressure storage tank 10, and completing the compression and storage of the carbon dioxide, wherein the components form a carbon dioxide pressurized storage part.

An outlet of the refrigerant absorber 11 is connected to an inlet of the refrigerant booster pump 12, an outlet of the refrigerant booster pump 12 is connected to a first inlet of the refrigerant vapor generator 13, a first outlet of the refrigerant vapor generator 13 is connected to an inlet of the first throttle expansion valve 14, and an outlet of the first throttle expansion valve 14 is connected to a first inlet of the refrigerant absorber 11; a third outlet of the refrigerant steam generator 13 is connected to an inlet of a refrigerant condenser 15, an outlet of the refrigerant condenser 15 is connected to an inlet of a second throttle expansion valve 16, an outlet of the second throttle expansion valve 16 is connected to a first inlet of a refrigerant evaporator 17, a first outlet of the refrigerant evaporator 17 is connected to a second inlet of the refrigerant absorber 11, and evaporation, heat absorption and absorption storage of the refrigerant are completed; an outlet of the first cooling working medium storage tank 18 is connected to an inlet of the cooling working medium booster pump 19, an outlet of the cooling working medium booster pump 19 is connected to a second inlet of the refrigerant evaporator 17, a second outlet of the refrigerant evaporator 17 is connected to a second inlet of the carbon dioxide condenser 08, and a second outlet of the carbon dioxide condenser 08 is connected to an inlet of the cooling working medium storage tank 18; an outlet of a second cooling working medium storage tank 20 is connected to an inlet of a second cooling working medium booster pump 21, an outlet of the second cooling working medium booster pump 21 is respectively connected with second inlets of the carbon dioxide primary interstage heat exchanger 05, the carbon dioxide secondary interstage heat exchanger 06 and the carbon dioxide tertiary interstage heat exchanger 07, second outlets of the carbon dioxide primary interstage heat exchanger 05, the carbon dioxide secondary interstage heat exchanger 06 and the carbon dioxide tertiary interstage heat exchanger 07 are connected with a second inlet of the refrigerant steam generator 13, a second outlet of the refrigerant steam generator 13 is connected with the second cooling working medium storage tank 20 to finish heat release and heat absorption of the cooling working medium, and the components form an absorption type refrigerating part.

The outlet of the organic working medium power turbine 22 is connected with the inlet of the organic working medium condenser 23, the outlet of the organic working medium condenser 23 is connected with the inlet of the organic working medium first booster pump 24, the outlet of the organic working medium first booster pump 24 is connected with the first inlet of the organic working medium first evaporator 25, the first outlet of the organic working medium first evaporator 25 is connected with the inlet of the organic working medium second booster pump 26, the outlet of the organic working medium second booster pump 26 is connected with the first inlet of the organic working medium second evaporator 27, and the first outlet of the organic working medium second evaporator 27 is connected with the first inlet of the organic working medium power turbine 22; a third outlet of the organic working medium first evaporator 25 is connected to a second inlet of the organic working medium power turbine 22, so that Rankine cycle working of the organic working medium is completed; the second inlet of the organic working medium second evaporator 27 is connected with the industrial waste heat, the second outlet of the organic working medium second evaporator 27 is connected with the second inlet of the organic working medium first evaporator 25, the second outlet of the organic working medium first evaporator 25 is connected with the fourth inlet of the refrigerant steam generator 13, the fourth outlet of the refrigerant steam generator 13 is connected with the industrial waste heat, the three-level cascade utilization of the industrial waste heat is completed, and the components form an organic Rankine cycle part.

The embodiment of the invention discloses CO of composite absorption refrigeration and organic Rankine cycle₂A process for operating a pressurized storage device, comprising:

carbon dioxide enters a carbon dioxide first-stage compressor 01 to be compressed, then enters a carbon dioxide first-stage interstage heat exchanger 05 to be cooled, then enters a carbon dioxide second-stage compressor 02 to be compressed, then enters a carbon dioxide second-stage interstage heat exchanger 06 to be cooled, then enters a carbon dioxide third-stage compressor 03 to be compressed, then enters a carbon dioxide third-stage interstage heat exchanger 07 to be cooled, then enters a carbon dioxide fourth-stage compressor 04 to be compressed, then enters a carbon dioxide condenser 08 to be condensed to a liquid state, then enters a carbon dioxide high-pressure compressor 09 to further increase the pressure to a supercritical state, and the compressed carbon dioxide enters a carbon dioxide high-pressure storage tank 10 to be stored.

Liquid refrigerant in the refrigerant absorber 11 is pressurized by the refrigerant booster pump 12 and then enters the refrigerant steam generator 13 to absorb heat and evaporate, and the unevaporated low-concentration liquid refrigerant returns to the refrigerant absorber 11 after being expanded by the first throttle expansion valve 14; the gaseous refrigerant generated by evaporation enters the refrigerant condenser 15 to be condensed into a liquid state, then is expanded by the second throttle expansion valve 16, enters the refrigerant evaporator 17 to be evaporated and absorb heat, and finally the gaseous refrigerant enters the refrigerant absorber 11 to be absorbed by the low-concentration liquid refrigerant.

The cooling working medium in the first cooling working medium storage tank 18 is pressurized by the first cooling working medium booster pump 19, enters the refrigerant evaporator 17 to release heat and cool, and the low-temperature cooling working medium enters the carbon dioxide condenser 08 to absorb heat and returns to the first cooling working medium storage tank 18.

The cooling working medium in the second storage tank 20 for cooling working medium is pressurized by the second booster pump 21 for cooling working medium, and then enters the carbon dioxide primary interstage heat exchanger 05, the carbon dioxide secondary interstage heat exchanger 06 and the carbon dioxide tertiary interstage heat exchanger 07 respectively to fully exchange heat with carbon dioxide, and then returns to the refrigerant steam generator 13 to provide heat for the evaporation of the refrigerant, and finally returns to the second storage tank 20 for cooling working medium.

Organic working medium at the outlet of the organic working medium power turbine 22 is condensed by the organic working medium condenser 23, leaves the condenser in the form of saturated liquid, is sent to the organic working medium first booster pump 24 for pressurization, then enters the organic working medium first evaporator 25 for partial evaporation, the middle-temperature and middle-pressure organic working medium steam directly enters the second inlet of the organic working medium power turbine to be mixed with original steam and then acts, the rest liquid organic working medium enters the organic working medium second booster pump 26 for pressurization and then enters the organic working medium second evaporator 27 for heat absorption and evaporation, the high-temperature and high-pressure steam enters the organic working medium power turbine 22 for acting, and the generated power is used for driving the compressor to circulate.

Industrial waste heat enters through the second inlet of the organic working medium second evaporator 27 and is heated to generate high-temperature and high-pressure steam, the organic working medium second evaporator 27 enters the second inlet of the organic working medium first evaporator 25 and continues to provide heat for the evaporation of the organic working medium to generate medium-temperature and medium-pressure steam, and then the medium-temperature and medium-pressure steam flows out of the second outlet of the organic working medium first evaporator 25 to the refrigerant steam generator 13 to provide heat for the evaporation of the refrigerant, so that the three-stage cascade utilization of the industrial waste heat is completed, and a stable heat source is provided for the organic Rankine cycle and the absorption refrigeration cycle.

Alternatively, the refrigerant of the absorption refrigeration section may be selected from an ammonia-water working substance pair or a water-lithium bromide working substance pair.

Optionally, the cooling working medium of the absorption refrigeration part can be water or heat conducting oil.

Optionally, the organic working medium of the organic Rankine cycle part can be isobutene (C4H8) or R134 a.

Optionally, the heat of the industrial waste heat input into the refrigerant steam generator 13 may be adjusted according to the demand, so as to adjust the refrigeration capacity of the absorption refrigeration cycle.

Preferably, the inlet pressure of the carbon dioxide first-stage compressor 01 is 0.18MPa, the outlet pressure of the carbon dioxide fourth-stage compressor 04 is 4.5MPa, the outlet pressure of the carbon dioxide high-pressure compressor 09 is 15MPa, and the pressure of the carbon dioxide high-pressure storage tank 10 is 15 MPa.

Preferably, the carbon dioxide used in the device can be carbon dioxide separated from various waste gases such as industrial tail gas, conventional power plant coal-fired exhaust gas, gas turbine exhaust gas and the like.

Preferably, the heat utilized in the organic working medium second evaporator 27, the organic working medium first evaporator 25 and the refrigerant steam generator 13 can utilize the exhaust gas of a gas turbine, geothermal heat (160-.

Preferably, the high pressure carbon dioxide storage tank 10 may be an oil well formation and high pressure carbon dioxide may be stored in the oil well for enhanced oil recovery.

The invention can realize that: the composite absorption type refrigeration and organic Rankine cycle system provides power for carbon dioxide compression through organic Rankine cycle by utilizing industrial waste heat, and provides a cold source below zero degree for carbon dioxide liquefaction through absorption type refrigeration, so that compression work consumed by carbon dioxide compression is reduced, and the efficiency of the carbon dioxide sequestration process is effectively improved.

In summary, the present invention provides a composite absorption refrigeration systemCO with organic Rankine cycle₂The pressurizing storage device can effectively improve the efficiency of the carbon dioxide sealing process and improve the energy utilization rate. The concrete advantages include: (1) according to the invention, the organic Rankine cycle system is combined with the traditional carbon dioxide sequestration process, and the kinetic energy generated by the organic Rankine cycle system is used for driving the compressor in the carbon dioxide sequestration process to work, so that the electric energy of a power grid is not required to be consumed, and the efficiency of the sequestration process is effectively improved; (2) aiming at the carbon dioxide sealing process, the carbon dioxide is firstly condensed and then directly compressed to the supercritical state, compared with the method of directly compressing the carbon dioxide to the supercritical state from the gas state, the consumed compression work is smaller, and the energy is saved; (3) the invention uses industrial waste heat or other low-grade heat as the heat source of the organic Rankine cycle and the absorption refrigeration cycle, realizes a three-level gradient utilization mode of the waste heat, and effectively improves the energy utilization rate; (4) according to the invention, the organic Rankine cycle and the absorption refrigeration cycle are combined, and the quantity and the sequence of industrial waste heat in the organic Rankine cycle and the absorption refrigeration cycle can be adjusted according to specific engineering conditions, so that the energy utilization rate is further improved, the flexible peak regulation is realized, and various composite requirements are met; (5) the invention utilizes the heat generated by carbon dioxide compression as the heat source of the absorption refrigeration cycle, realizes the cyclic utilization of energy, reduces the energy consumption and further improves the energy utilization rate. In conclusion, the carbon dioxide pressurized storage device designed by the invention can efficiently realize the sealing and storage of carbon dioxide, can effectively improve the energy utilization rate, and has a wide application background.

Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.