System and method for compressed air energy storage coupled with organic solid waste to produce gas and electricity

Abstract

The present invention relates to the technical field of thermochemical utilization of organic solid waste, and specifically to a system and method for the co-production of gas and electricity by coupling compressed air energy storage with organic solid waste. It includes an air compression subsystem, a compression heat subsystem, an air expansion subsystem, an organic solid waste gasification subsystem, and a heat recovery subsystem; the compression heat subsystem recycles the compression heat of the compressed air generated by the compressed air subsystem, thereby improving the grade and output of the combustible gas produced by the entire system; the heat recovery subsystem recycles the high-temperature heat of the combustible gas generated by the organic solid waste gasification subsystem, thereby improving the ability of the air expansion subsystem to do work and generate electricity, and realizing the cogeneration of gas and electricity while reducing overall losses. By coupling the gasification of organic solid waste with the compressed air energy storage system, the compression heat is fully recovered to achieve cascade utilization of heat, and the high-temperature heat of the combustible gas produced by gasification is recycled and utilized, thereby improving the ability of compressed air energy storage expansion to do work.

Description

Technical Field

[0001] The present invention relates to the technical field of thermochemical utilization of organic solid waste, and in particular to a system and method for compressed air energy storage coupled with organic solid waste to produce gas and electricity. Background Art

[0002] On the one hand, energy consumption is growing, and the absorption of new energy with large volatility has brought about a huge demand for energy storage. As a new type of large-scale energy storage technology, compressed air energy storage is of great significance to the optimization of energy structure and the regulation of power grid operation. Its main working principle is: using the low electricity price of the power system, the air compressor is driven by a motor to compress the normal-pressure air of the ambient atmosphere and store it in the gas storage reservoir, that is, converting electrical energy into the potential energy of air; when the power grid is at a peak load and the electricity price is high, the compressed air in the gas storage reservoir is released in a controlled and orderly manner through the pipeline, and expands in the expander to do work, thereby driving the generator to generate electricity; through the above process, the compressed air energy storage system can store the cheap electricity during the low load period as the potential energy of compressed air, and then convert it into electricity when the power system load is peak, so as to achieve the optimization and regulation of power grid operation by peak shaving and valley filling.

[0003] The existing compressed air energy storage system needs to use a heat exchanger to heat the 40-50°C compressed air from the gas storage tank to increase the temperature and pressure before the expander equipment; because the higher the temperature and pressure of the compressed air, the higher the energy of the compressed air, and the stronger its ability to drive the expander to do work and generate electricity; currently, when no external heat source is introduced, the temperature of the compressed air before entering the expander is about 180°C (limited by the operating temperature of the compressor and the maximum temperature of the compressed heat storage). By introducing sunlight as an external heat source to heat the compressed air, it was found that when the intake temperature increased from 180°C to 230°C, the energy storage efficiency increased by 5.6%, and the energy storage efficiency increased significantly with the increase of the intake temperature; in addition, the thermochemical utilization of organic solid waste to produce combustible gas, its flue gas as high as 600-800 degrees Celsius brings a lot of energy loss. If this part of energy is stored in a heat exchanger and then transferred to the compressed air from the gas storage, this can significantly increase the temperature and pressure of the compressed air before entering the expander, thereby improving the ability of compressed air to expand and do work and the efficiency of the entire compressed air energy storage system; and the thermochemical production of high-temperature fuel gas from organic solid waste is not affected by weather, and is more stable than sunlight as an external heat source.

[0004] On the other hand, since solid waste contains a large amount of organic matter, it can be recycled by introducing water vapor for thermochemical conversion. However, conventional organic solid waste gasification technology has the following disadvantages: (1) The energy density and volume density of organic solid waste raw materials are low, that is, the calorific value of organic solid waste raw materials is low; (2) A large amount of additional energy is required to convert water into water vapor; (3) The gas temperature after gasification is as high as 800-900℃, and it needs to be cooled by spraying water before being sent to the gas storage tank, resulting in heat release loss.

[0005] By adopting compressed air energy storage coupled with organic solid waste gasification technology, it is possible to fully utilize the compression heat, and realize the cascade utilization of compression heat through organic solid waste raw material pretreatment and water vapor generator, thereby increasing the energy density and volume density of organic solid waste, and promoting the conversion of liquid water into gasification medium water vapor; in addition, the high-grade heat of high-temperature gasification gas is used to heat the compressed air from the gas storage, thereby improving the ability of compressed air to drive the expander to generate power, avoiding the waste of a large amount of high-grade thermal energy of the combustible gas obtained by high-temperature gasification, and realizing the cogeneration of gas and electricity.

[0006] Therefore, it is particularly important to realize the coupling of compressed air energy storage and organic solid waste gasification technology. Summary of the invention

[0007] The purpose of the present invention is to address the defects of the prior art and to provide a system and method for the co-production of gas and electricity by coupling compressed air energy storage with organic solid waste. A method for coupling compressed air energy storage with organic solid waste is provided, which can achieve the harmless treatment and resource utilization of organic solid waste while solving the problems of low energy density and volume density of organic solid waste raw materials, the need for extra energy consumption by pretreatment of organic solid waste raw materials and water vapor generators, and heat release loss caused by cooling of high-temperature combustible gases produced by gasification before storage in gas tanks.

[0008] The present invention provides a system for compressed air energy storage coupled with organic solid waste to produce gas and electricity, comprising:

[0009] A compressed air subsystem, comprising a drive motor, an air compressor, a compression heat exchanger, a high-temperature side flow channel of the compression heat exchanger, and a compressed air storage device connected in series in sequence;

[0010] A compression heat subsystem, comprising a low-temperature side flow channel of a compression heat exchanger, a high-temperature side flow channel of a pretreatment device, a water vapor generator, a high-temperature side flow channel of the water vapor generator, and a water pump connected in series in sequence, wherein the output end of the low-temperature side flow channel of the compression heat exchanger is connected to the input end of the high-temperature side flow channel of the pretreatment device, the high-temperature side flow channel of the pretreatment device surrounds and wraps the pretreatment device, the output end of the high-temperature side flow channel of the pretreatment device is connected to the input end of the high-temperature side flow channel of the water vapor generator, and the high-temperature side flow channel of the water vapor generator surrounds and wraps the water vapor generator;

[0011] The air expansion subsystem includes an air storage device, a low-temperature flow passage of a heat recovery heat exchanger, an air expander, and a generator M connected thereto, which are sequentially connected in series;

[0012] An organic solid waste gasification subsystem, comprising a pretreatment device, a silo and a gasifier connected in parallel with a steam generator, wherein the output end of the silo and the output end of the steam generator are connected in parallel to the input end of the gasifier, and the output end of the silo is located above the output end of the steam generator;

[0013] The heat recovery subsystem includes a purification dust collector, a high-temperature flow channel of a heat exchanger, a fan and a combustible gas storage tank which are connected in series in sequence. The output end of the purification dust collector is connected to the input end of the high-temperature flow channel of the heat exchanger.

[0014] Preferably, the high-temperature side flow channel of the pretreatment device and the high-temperature side flow channel of the steam generator work simultaneously or alternately.

[0015] Preferably, when the organic solid waste gasification subsystem is in operation, the silo and the gasifier are operated simultaneously, and the pretreatment device and the steam generator are operated simultaneously or alternately.

[0016] Preferably, the air compressor and the high-temperature side flow passage of the compression heat exchanger form a compression combination, the number of the compression combinations is 1 or 2 or more, and different compression combinations are connected in series or in parallel;

[0017] The low-temperature flow passage of the regenerative heat exchanger and the air expander form an expansion combination, the number of the expansion combinations is 1 or 2 or more, and different expansion combinations are connected in series or in parallel.

[0018] Preferably, the organic solid waste includes urban domestic garbage, agricultural and forestry straw biomass, sludge, and livestock manure.

[0019] Preferably, the structures of the compression heat exchanger and the regenerative heat exchanger are plate type or shell and tube type, and the compression heat exchanger and the regenerative heat exchanger are filled with heat carrier, and the heat carrier is any one of liquid working fluid, phase change heat storage material, and granular heat storage working fluid with certain fluidity.

[0020] Preferably, the pretreatment device includes any one of a rotary kiln, a fixed bed, a roasting furnace, a bubbling fluidized bed, and a circulating fluidized bed.

[0021] More preferably, the compressed air storage device includes any one of a salt rock cave, a hard rock cave, an aquifer, an abandoned mine, an artificial cave, a metal gas storage tank, a composite gas storage tank, and an underwater air bag, and the compressed air storage device includes a single gas storage device or multiple parallel gas storage devices.

[0022] The present invention also provides a control method for a system of compressed air energy storage coupled with organic solid waste co-production of gas and electricity, including an energy storage stage and an energy release stage;

[0023] The energy storage stage includes:

[0024] During the low electricity price period or when there is wind and solar power curtailment, the compressed air generated by the air compressor enters the high-temperature side flow channel of the compression heat exchanger to exchange heat with the low-temperature heat carrier entering through the pretreatment device and the steam generator. The compressed air after cooling enters the compressed air storage device for storage;

[0025] The energy release stage includes:

[0026] During the peak period of electricity consumption, the compressed air from the compressed air storage device first enters the low-temperature side flow channel of the heat exchanger. The high-temperature combustible gas obtained after gasification of organic solid waste is first purified by the purification dust collector and then enters the heat exchanger. The high-grade heat heats the compressed air from the compressed air storage device and flows through the low-temperature side flow channel of the heat exchanger through the high-temperature side flow channel of the heat exchanger. After the temperature and pressure of the compressed air are increased, it enters the air expander to expand and do work, driving the generator motor M to generate electricity. After the combustible gas releases heat, it passes through the fan and enters the combustible gas storage tank for storage.

[0027] Preferably, when the compressed air subsystem starts to store energy, the pretreatment device and the steam generator operate simultaneously or alternately;

[0028] When the pretreatment device is operated alone, the heat is used to pretreat the organic solid waste raw materials by baking in the pretreatment device;

[0029] When the steam generator operates alone, the heat is used to heat liquid water in the steam generator to obtain the gasification medium steam required for the gasification of organic solid waste.

[0030] The beneficial effects of the present invention are:

[0031] 1. The present invention is provided with a compressed air subsystem, a compression heat subsystem, an air expansion subsystem, an organic solid waste gasification subsystem, and a heat recovery subsystem. The compression heat subsystem recycles the compression heat of the compressed air generated by the compressed air subsystem, thereby improving the quality and output of the combustible gas produced by the entire system; the heat recovery subsystem recycles the high-temperature heat of the combustible gas generated by the organic solid waste gasification subsystem, thereby improving the ability of the air expansion subsystem to generate power, thereby reducing the overall While eliminating losses, gas and electricity cogeneration is achieved. The present invention couples the gasification of organic solid waste with the compressed air energy storage system, fully recovers the compression heat to achieve cascade utilization of heat, and recovers the high-temperature heat of the combustible gas produced by gasification, thereby improving the ability of compressed air energy storage to expand and do work. By appropriately adjusting the operating modes of the pretreatment furnace and the water vapor generator, such as running simultaneously or separately or changing the operating load, the entire organic solid waste gasification subsystem can produce combustible gases with different contents and calorific values ​​according to user needs. The coupling method of compressed air energy storage and organic solid waste provided by the present invention can achieve the harmless treatment and resource utilization of organic solid waste, while solving the problems of low energy density and volume density of organic solid waste raw materials, the need for extra energy consumption by the pretreatment of organic solid waste raw materials and the water vapor generator, and the heat release loss caused by cooling of the high-temperature combustible gas produced by gasification before being stored in the gas tank.

[0032] 2. The present invention is provided with a compression heat subsystem, which includes a low-temperature side flow channel of a compression heat exchanger, a high-temperature side flow channel of a pretreatment device, a water vapor generator and its high-temperature side flow channel, and a water pump connected in series in sequence; the output end of the low-temperature side flow channel of the compression heat exchanger is connected to the input end of the high-temperature side flow channel of the pretreatment device; the high-temperature side flow channel of the pretreatment device surrounds and wraps the pretreatment device; the output end of the high-temperature side flow channel of the pretreatment device is connected to the input end of the high-temperature side flow channel of the water vapor generator; the high-temperature side flow channel of the water vapor generator surrounds and wraps the water vapor generator. When electricity prices are low or there is wind and solar power curtailment, the compression heat subsystem begins to store energy. The compressed air at a certain temperature generated by the air compressor enters the high-temperature side flow channel of the compression heat exchanger and exchanges heat with the low-temperature heat carrier entering through the pretreatment device and the steam generator, fully recovering the compression heat to achieve cascade utilization of heat for the pretreatment of organic solid waste and the steam generator. The higher temperature heat used in the pretreatment device pretreats the organic solid waste to increase its energy density and volume density; the lower temperature heat used in the steam generator heats the liquid water to obtain the gasification medium water vapor required for the gasification of the organic solid waste. The water vapor promotes the gasification of the organic solid waste to obtain a combustible gas with a higher hydrogen content.

[0033] 3. The present invention is provided with an organic solid waste gasification subsystem, which includes a pretreatment device and a silo connected in series, and then connected to a gasifier in parallel with a steam generator; the output end of the silo is connected in parallel with the output end of the steam generator to the input end of the gasifier; the output end of the silo is located above the output end of the steam generator. The silo plays the role of caching and storing the high energy density and volume density raw materials generated by the pretreatment device. The steam generator can change the content and output of the gas produced by the gasifier by adjusting the flow of the gasification medium water vapor generated by its own load; when the operation mode of the pretreatment device and the steam generator is appropriately adjusted, such as running simultaneously or separately or adjusting the operation load of the two, the entire organic solid waste gasification subsystem can produce combustible gases with different volume outputs and different hydrogen contents and calorific values ​​per unit time according to user needs.

[0034] 4. The present invention is provided with a heat recovery subsystem, which includes a purification dust collector, a high-temperature side flow channel of a heat exchanger, a fan and a combustible gas storage tank connected in series in sequence. The output end of the purification dust collector is connected to the input end of the high-temperature side flow channel of the heat exchanger. The high-temperature combustible gas obtained after the organic solid waste is gasified is first purified by the purification dust collector and then enters the heat exchanger. Its high-grade heat heats the compressed air from the compressed air storage tank and flows through the low-temperature side flow channel of the heat exchanger through the high-temperature side flow channel of the heat exchanger; the compressed air is heated and pressurized, and then enters the air expander to expand and do work, driving the generator to generate electricity; the heat exchanger recycles the high-temperature heat of the combustible gas produced by the organic solid waste gasification subsystem, thereby improving the ability of compressed air to store energy, expand, do work and generate electricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a connection diagram of the present invention.

[0036] In the figure, 1. drive motor; 2. air compressor; 3. compression heat exchanger; 4. high temperature side flow channel of compression heat exchanger; 5. low temperature side flow channel of compression heat exchanger; 6. compressed air storage device; 7. reheat exchanger; 8. low temperature measuring flow channel of reheat exchanger; 9. high temperature measuring flow channel of reheat exchanger; 10. air expander; 11. pretreatment device; 12. silo; 13. gasifier; 14. purification dust collector; 15. combustible gas storage tank; 16. high temperature side flow channel of steam generator; 17. steam generator; 18. water pump; 19. high temperature side flow channel of pretreatment device; 20. fan. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0039] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways. "Multiple" means "two or more".

[0042] Embodiment 1

[0043] Figure 1 Shows a preferred embodiment of the present application ( Figure 1The figure shows a connection diagram of a system for compressed air energy storage coupled with organic solid waste co-production of gas and electricity provided in the first embodiment of the present application. For the sake of convenience, only the parts related to the present embodiment are shown, which are described in detail as follows:

[0044] A system of compressed air energy storage coupled with organic solid waste to produce gas and electricity in this embodiment includes:

[0045] A compressed air subsystem, which includes a drive motor 1, an air compressor 2, a compression heat exchanger 3, a high-temperature side flow channel 4 of the compression heat exchanger, and a compressed air storage device 6, which are sequentially connected in series;

[0046] A compression heat subsystem, which includes a low-temperature side flow channel 5 of a compression heat exchanger, a high-temperature side flow channel 19 of a pretreatment device, a water vapor generator 17, a high-temperature side flow channel 16 of the water vapor generator, and a water pump 18, which are sequentially connected in series, wherein the output end of the low-temperature side flow channel 5 of the compression heat exchanger is connected to the input end of the high-temperature side flow channel 19 of the pretreatment device, the high-temperature side flow channel 19 of the pretreatment device surrounds and wraps the pretreatment device 11, the output end of the high-temperature side flow channel 19 of the pretreatment device is connected to the input end of the high-temperature side flow channel 16 of the water vapor generator, and the high-temperature side flow channel 16 of the water vapor generator surrounds and wraps the water vapor generator 17;

[0047] The air expansion subsystem includes an air storage device 6, a low-temperature flow passage 8 of a heat recovery heat exchanger, an air expander 10 and a generator M connected thereto, which are sequentially connected in series;

[0048] The organic solid waste gasification subsystem includes a pretreatment device 11, a silo 12 and a gasifier 13 connected in parallel with a steam generator 17, wherein the output end of the silo 12 is connected in parallel with the output end of the steam generator 17 to the input end of the gasifier 13, and the output end of the silo 12 is located above the output end of the steam generator 17;

[0049] The heat recovery subsystem includes a purification dust collector 14, a high-temperature flow channel 9 of a heat exchanger, a fan 20 and a combustible gas storage tank 15 which are connected in series in sequence. The output end of the purification dust collector 14 is connected to the input end of the high-temperature flow channel 9 of the heat exchanger.

[0050] In one embodiment, the high temperature side flow channel 19 of the pretreatment device and the high temperature side flow channel 16 of the steam generator can work simultaneously, can work alternately, or can keep only one of them working alone.

[0051] In one embodiment, when the organic solid waste gasification subsystem is in operation, the silo 12 and the gasifier 13 operate simultaneously, but the pretreatment device 11 and the steam generator 17 can operate simultaneously, can operate alternately, or can keep only one of them to operate alone.

[0052] In one embodiment, the air compressor 2 and the high-temperature side flow channel 4 of the compression heat exchanger form a compression combination, the number of compression combinations is 1 or 2 or more, and different compression combinations are connected in series or in parallel; the low-temperature side flow channel 8 of the heat recovery exchanger and the air expander 10 form an expansion combination, the number of expansion combinations is 1 or 2 or more, and different expansion combinations are connected in series or in parallel.

[0053] In one embodiment, the air compressor 2 is driven by a driving motor 1; in other embodiments, the air compressor 2 may also be driven by other mechanisms such as a pneumatic motor and a hydraulic motor.

[0054] In one embodiment, organic solid waste includes but is not limited to urban domestic garbage, agricultural and forestry straw biomass, sludge, livestock manure, etc.

[0055] In one embodiment, the structures of the compression heat exchanger 3 and the heat recovery heat exchanger 7 are plate type or shell and tube type, and the compression heat exchanger 3 and the heat recovery heat exchanger 7 are filled with heat carrier, and the heat carrier is any one of liquid working fluid, phase change heat storage material, and granular heat storage working fluid with certain fluidity.

[0056] In one embodiment, the pretreatment device 11 includes any one of a rotary kiln, a fixed bed, a roasting furnace, a bubbling fluidized bed, and a circulating fluidized bed.

[0057] In one embodiment, the compressed air storage device 6 includes any one of a salt rock cave, a hard rock cave, an aquifer, an abandoned mine, an artificial cave, a metal gas storage tank, a composite gas storage tank, and an underwater air bag. The compressed air storage device 6 includes a single gas storage device or multiple parallel gas storage devices.

[0058] Embodiment 2

[0059] The present invention also provides a control method for a system for compressed air energy storage coupled with organic solid waste to produce gas and electricity, including an energy storage stage and an energy release stage.

[0060] The energy storage stage includes: when the electricity price is low or there is wind and solar power curtailment, the compressed air generated by the air compressor 2 enters the high-temperature side flow channel 4 of the compression heat exchanger to exchange heat with the low-temperature heat carrier entering through the pretreatment device 11 and the steam generator 17, and the compressed air after cooling enters the compressed air storage device 6 for storage;

[0061] The energy release process is mainly an air expansion power generation process. The energy release stage includes: during the peak period of electricity consumption, air expansion power generation outputs electricity to the outside, and the compressed air from the compressed air storage device 6 first enters the low-temperature flow channel 8 of the heat exchanger to absorb the heat stored in the heat exchanger 7; the high-temperature combustible gas obtained after the organic solid waste is gasified is first purified by the purification dust collector 14 and then enters the heat exchanger 7, and its high-grade heat heats the compressed air from the compressed air storage device 6 and flows through the low-temperature flow channel 8 of the heat exchanger through the high-temperature flow channel 9 of the heat exchanger; the compressed air is heated and pressurized, and then enters the air expander 10 to expand and do work, driving the generator M to generate electricity, and the combustible gas releases heat and enters the combustible gas storage tank 15 through the fan 20 for storage.

[0062] In one embodiment, the process of gasifying organic solid waste to produce combustible gas is also included:

[0063] The organic solid waste raw materials first enter the pretreatment device 11 for pretreatment, and enter the silo 12 after the energy density and volume density are increased. Then, they enter the gasifier 13 together with the gasification medium water vapor generated from the water vapor generator 17 for thermochemical reaction to obtain high-temperature combustible gas. After being purified by the purification dust collector 14, they are cooled by the heat exchanger 7 and stored in the combustible gas storage tank 15 under the action of the fan 20.

[0064] In one embodiment, when the compressed air subsystem starts to store energy, the pretreatment device 11 and the steam generator 17 operate simultaneously or alternately;

[0065] When the pretreatment device 11 operates alone, the compressed air at a certain temperature generated by the air compressor 2 enters the high-temperature side flow channel of the compression heat exchanger 3 and exchanges heat with the low-temperature heat carrier entering through the pretreatment device 11 and the steam generator 17 (not working at this time). The heat is used to bake the organic solid waste raw materials in the pretreatment device 11 to improve the energy density and volume density of the organic solid waste raw materials.

[0066] When the steam generator 17 operates alone, the compressed air of a certain temperature generated by the air compressor 2 enters the high-temperature side flow channel of the compression heat exchanger 3 and exchanges heat with the low-temperature heat carrier entering through the pretreatment device 11 (not working at this time) and the steam generator 17. The heat is used to heat liquid water in the steam generator 17 to obtain the gasification medium water vapor required for the gasification of organic solid waste. The water vapor promotes the gasification of organic solid waste to obtain a combustible gas with a higher hydrogen content.

[0067] In one embodiment, when the pretreatment device 11 and the steam generator 17 are operated simultaneously, the entire organic solid waste gasification subsystem can produce a combustible gas with a higher yield and / or better gas quality than when the pretreatment device 11 and the steam generator 17 are operated alone.

[0068] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A system for compressed air energy storage coupled with organic solid waste to produce gas and electricity, characterized in that: include: A compressed air subsystem, comprising a drive motor (1), an air compressor (2), a compression heat exchanger (3), a high-temperature side flow channel (4) of the compression heat exchanger, and a compressed air storage device (6) connected in series in sequence; A compression heat subsystem, comprising a low-temperature side flow channel (5) of a compression heat exchanger, a high-temperature side flow channel (19) of a pretreatment device, a water vapor generator (17), a high-temperature side flow channel (16) of the water vapor generator, and a water pump (18) connected in series in sequence, wherein the output end of the low-temperature side flow channel (5) of the compression heat exchanger is connected to the input end of the high-temperature side flow channel (19) of the pretreatment device, the high-temperature side flow channel (19) of the pretreatment device surrounds and wraps the pretreatment device (11), the output end of the high-temperature side flow channel (19) of the pretreatment device is connected to the input end of the high-temperature side flow channel (16) of the water vapor generator, and the high-temperature side flow channel (16) of the water vapor generator surrounds and wraps the water vapor generator (17); An air expansion subsystem, comprising an air storage device (6), a low-temperature flow passage (8) of a heat recovery heat exchanger, an air expander (10), and a generator M connected thereto in series; An organic solid waste gasification subsystem, comprising a pretreatment device (11), a silo (12), and a gasifier (13) connected in series with a steam generator (17), wherein the output end of the silo (12) and the output end of the steam generator (17) are connected in parallel to the input end of the gasifier (13), and the output end of the silo (12) is located above the output end of the steam generator (17); A heat recovery subsystem, comprising a purification dust collector (14), a high-temperature flow channel (9) of a heat recovery heat exchanger, a fan (20), and a combustible gas storage tank (15) connected in series in sequence, wherein the output end of the purification dust collector (14) is connected to the input end of the high-temperature flow channel (9) of the heat recovery heat exchanger; The high-temperature side flow channel (19) of the pretreatment device and the high-temperature side flow channel (16) of the steam generator operate simultaneously or alternately; When the organic solid waste gasification subsystem is in operation, the silo (12) and the gasifier (13) are operated simultaneously, and the pretreatment device (11) and the steam generator (17) are operated simultaneously or alternately; It includes energy storage stage and energy release stage; The energy storage stage includes: During the low electricity price period or when wind and solar power are abandoned, the compressed air generated by the air compressor (2) enters the high-temperature side flow channel (4) of the compression heat exchanger to exchange heat with the low-temperature heat carrier entering through the pretreatment device (11) and the steam generator (17), and the compressed air after cooling enters the compressed air storage device (6) for storage; The energy release stage includes: During the peak period of electricity consumption, the compressed air from the compressed air storage device (6) first enters the low-temperature flow channel (8) of the heat exchanger. The high-temperature combustible gas obtained after the organic solid waste is gasified is first purified by the purification dust collector (14) and then enters the heat exchanger (7). The high-quality heat of the compressed air passes through the high-temperature flow channel (9) of the heat exchanger to heat the compressed air from the compressed air storage device (6) and flows through the low-temperature flow channel (8) of the heat exchanger. After the compressed air is heated and pressurized, it enters the air expander (10) to expand and perform work, driving the generator M to generate electricity. After the combustible gas releases heat, it passes through the fan (20) and enters the combustible gas storage tank (15) for storage. The higher temperature heat used in the pretreatment device (11) pre-treats the organic solid waste to improve its energy density and volume density; the lower temperature heat used in the steam generator (17) heats liquid water to obtain water vapor, a gasification medium required for gasification of the organic solid waste, to promote the gasification of the organic solid waste to obtain a combustible gas with a higher hydrogen content.

2. The system of compressed air energy storage coupled with organic solid waste co-production of gas and electricity according to claim 1 is characterized by: The air compressor (2) and the high-temperature side flow passage (4) of the compression heat exchanger form a compression combination, the number of the compression combinations is 1 or more than 2, and different compression combinations are connected in series or in parallel; The low-temperature flow passage (8) of the regenerative heat exchanger and the air expander (10) form an expansion combination, the number of the expansion combinations is one or more than two, and different expansion combinations are connected in series or in parallel.

3. The system of compressed air energy storage coupled with organic solid waste co-production of gas and electricity according to claim 1 is characterized by: The organic solid waste includes urban domestic garbage, agricultural and forestry straw biomass, sludge, and livestock manure.

4. The system of compressed air energy storage coupled with organic solid waste co-production of gas and electricity according to claim 1 is characterized by: The structures of the compression heat exchanger (3) and the regenerative heat exchanger (7) are plate-type or shell-and-tube-type. The compression heat exchanger (3) and the regenerative heat exchanger (7) are filled with a heat carrier, and the heat carrier is any one of a liquid working medium, a phase-change heat storage material, and a granular heat storage working medium with a certain fluidity.

5. The system of compressed air energy storage coupled with organic solid waste co-production of gas and electricity according to claim 1 is characterized by: The pretreatment device (11) comprises any one of a rotary kiln, a fixed bed, a roasting furnace, a bubbling fluidized bed, and a circulating fluidized bed.

6. The system of compressed air energy storage coupled with organic solid waste co-production of gas and electricity according to claim 1 is characterized by: The compressed air storage device (6) comprises any one of a salt rock cave, a hard rock cave, an aquifer, an abandoned mine cave, an artificial cave, a metal gas storage tank, a composite gas storage tank, and an underwater air bag; the compressed air storage device (6) comprises a single gas storage device or a plurality of parallel gas storage devices.

7. The system of compressed air energy storage coupled with organic solid waste co-production of gas and electricity as claimed in claim 1, characterized in that: During the energy storage process of the compressed air subsystem, the pretreatment device (11) and the water vapor generator (17) operate simultaneously or alternately; When the pretreatment device (11) is operated alone, the heat is used to pre-treat the organic solid waste raw material by baking in the pretreatment device (11); When the water vapor generator (17) operates alone, the heat is used to heat liquid water in the water vapor generator (17) to obtain water vapor, a gasification medium required for gasification of organic solid waste.

Images