Multi-energy complementary system based on compressed air energy storage and biomass energy

Abstract

The invention discloses a multi-energy complementary system based on compressed air energy storage and biomass energy, so that the advantages of the compressed air energy storage and the biomass energy are fully utilized, natural energy is utilized to the maximum extent by the system, and meanwhile, the problem that the energy utilization efficiency of a single system is low is solved. According to the technical scheme, the system comprises a compressed air energy storage unit used for conducting compressed air energy storage on input electric energy and releasing energy in compressed air through an expansion machine so as to conduct power generation and heat recovery; the biomass energy unit is used for utilizing synthesis gas generated by biomass gasification as fuel and providing electric power output and waste heat recovery through combustion; and the heat supply circulating unit is used for recovering waste heat generated by the compressed air energy storage unit and the biomass energy unit and conveying heat to an external heat user side.

Description

Technical Field

[0001] The present application belongs to the field of energy utilization technology, and in particular relates to a multi-energy complementary system based on compressed air energy storage and biomass energy. Background Art

[0002] With the continuous growth of global energy demand and the increasing severity of environmental problems, traditional single-energy systems have gradually exposed numerous problems, such as unstable energy supply and demand, low conversion efficiency, and environmental pollution. These problems seriously restrict the sustainable development of energy systems and pose a threat to the living environment of human society. Against this backdrop, the development and utilization of renewable energy has attracted widespread attention worldwide. Renewable energy sources such as wind and solar energy offer advantages such as cleanliness and reproducibility. However, their development and utilization also pose inherent challenges such as volatility and uncontrollability. This has seriously restricted the long-term stable supply of renewable energy, making it difficult to meet the demand for a stable energy supply in modern society.

[0003] Energy storage technology has emerged to address the volatility of renewable energy. Compressed air energy storage systems, as a highly efficient energy storage technology, have been widely researched and applied in recent years. This system effectively addresses the volatility of renewable energy by converting electricity generated by renewable energy sources such as wind and solar power into high-pressure air for storage. During peak power supply periods, the high-pressure air is released to drive an expander to produce work, which is then converted into electricity. However, the single compressed air energy storage process also has certain limitations in practical applications. For example, the waste heat generated in the process is often not fully utilized, which not only results in energy waste but also leads to low overall energy efficiency of the system, making it difficult to fully realize its potential in energy storage and conversion.

[0004] At the same time, biomass energy, as an important renewable energy source, has abundant resource reserves and good environmental friendliness. Through biomass gasification technology, biomass energy can be converted into high-calorific value gas fuel, which can be further used for power generation or heating. This conversion method can not only significantly reduce greenhouse gas emissions, but also effectively reduce waste generation, with significant environmental benefits. However, the single use of biomass energy also faces many challenges. For example, biomass resources are usually relatively scattered, and the collection and transportation costs are high, which to a certain extent limits its large-scale application. In addition, certain pollutants may be generated during the combustion of biomass, and its calorific value is relatively low. These problems restrict the efficient use of biomass energy. Therefore, in order to further improve the energy utilization efficiency of biomass energy, it is necessary to flexibly develop biomass energy and actively explore its integration and coordinated optimization with other energy systems.

[0005] Therefore, in the existing technologies, whether it is a single renewable energy utilization system, a single compressed air energy storage system, or a biomass energy utilization system, there are certain shortcomings, and it is difficult to meet the needs of modern society for efficient, stable, and environmentally friendly energy systems. Summary of the Invention

[0006] The following is a brief summary of one or more aspects to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceivable aspects and is neither intended to identify key or critical elements of all aspects nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that will be provided later.

[0007] The purpose of the present invention is to solve the above problems and provide a multi-energy complementary system based on compressed air energy storage and biomass energy, so as to fully utilize the advantages of compressed air energy storage and biomass energy, maximize the use of natural energy by the system, and solve the problem of low energy utilization efficiency of a single system.

[0008] The technical solution of the present invention is as follows: The present invention discloses a multi-energy complementary system based on compressed air energy storage and biomass energy, comprising:

[0009] Compressed air energy storage unit, used to store the input electrical energy in compressed air and release the energy in the compressed air through an expander to generate electricity and recover heat;

[0010] Biomass energy unit, which is used to generate syngas from biomass gasification as fuel, provide power output and waste heat recovery through combustion;

[0011] The heat supply circulation unit is used to recover the waste heat generated by the compressed air energy storage unit and the biomass energy unit, and transmit the heat to an external heat user end.

[0012] According to one embodiment of the multi-energy complementary system based on compressed air energy storage and biomass energy of the present invention, the compressed air energy storage unit includes a first air compressor, a first heat exchanger, a second air compressor, a second heat exchanger, a third air compressor, a third heat exchanger, a fourth air compressor, a fourth heat exchanger, a fifth heat exchanger, a high-pressure air storage tank, a pressure reducing valve, a sixth heat exchanger, a first adiabatic expander, a first generator, a seventh heat exchanger, a second adiabatic expander, a second generator, an eighth heat exchanger, a third adiabatic expander and a third generator, which are connected in sequence.

[0013] According to an embodiment of the multi-energy complementary system based on compressed air energy storage and biomass energy of the present invention, the structure of the compressed air energy storage unit includes four parts: air compressor and heat exchanger, high-pressure air storage tank, expander and generator, and first waste heat recovery.

[0014] According to one embodiment of the multi-energy complementary system based on compressed air energy storage and biomass energy of the present invention, the biomass energy unit includes a hot air dryer, a biomass gasifier, a cyclone separator, a synthesis gas storage tank and a dual-fuel engine connected in sequence.

[0015] According to an embodiment of the multi-energy complementary system based on compressed air energy storage and biomass energy of the present invention, the structure of the biomass energy unit includes three parts: biomass pretreatment and gasification, synthesis gas storage and combustion, and second waste heat recovery.

[0016] According to an embodiment of the multi-energy complementary system based on compressed air energy storage and biomass energy of the present invention, the heating circulation unit includes a first circulating water heat exchanger, a second circulating water heat exchanger, a first heating circulation pump and a second heating circulation pump, wherein the first circulating water heat exchanger is used to recover the waste heat of the cooling water of the dual-fuel engine, the second circulating water heat exchanger is used to recover the waste heat of the expanded exhaust gas, the first heating circulation pump is used to transport cold water to the compressed air energy storage unit and the biomass energy unit for heat recovery, and the second heating circulation pump is used to transport the heated circulating water to the heat user end.

[0017] According to an embodiment of the multi-energy complementary system based on compressed air energy storage and biomass energy of the present invention, the structure of the heating circulation unit includes two parts: a third waste heat recovery part and a hot water delivery part.

[0018] According to one embodiment of the multi-energy complementary system based on compressed air energy storage and biomass energy of the present invention, the high-pressure gas storage tank in the compressed air energy storage unit and the biomass gasifier in the biomass energy unit are connected through the hot flow stream of the fourth heat exchanger to cool the synthesis gas and improve the gasification efficiency.

[0019] According to one embodiment of the multi-energy complementary system based on compressed air energy storage and biomass energy of the present invention, the exhaust gas outlet of the dual-fuel engine of the biomass energy unit passes through the hot flow streams of the eighth heat exchanger and the seventh heat exchanger in sequence, which are used to recover the waste heat of the exhaust gas and increase the inlet temperature of the second adiabatic expander and the third adiabatic expander, thereby improving the expansion efficiency and power generation efficiency.

[0020] According to one embodiment of the multi-energy complementary system based on compressed air energy storage and biomass energy of the present invention, the first circulating water heat exchanger of the heating circulation unit is used to recover the waste heat of the dual-fuel engine cooling system, and the second circulating water heat exchanger is used to recover the waste heat of the exhaust gas of the third adiabatic expander, and the recovered heat is transferred to the heat user end through the second circulating water pump to reduce the energy consumption and operating costs of the system.

[0021] Compared with the prior art, the present invention has the following beneficial effects: compared with the traditional single compressed air energy storage system, the system of the present invention adds biomass energy to effectively overcome the problem of single compressed air energy storage being highly dependent on renewable energy power input. In the case of insufficient or unstable renewable energy power, biomass gasification technology can provide continuous energy supplementation, making up for the problem of insufficient energy storage and output of the compressed air energy storage system due to energy supply fluctuations, thereby significantly improving the stability of energy supply and the overall efficiency of the system. Compared with a single biomass energy system, the system of the present invention can reduce the problem of unstable energy output caused by dispersed resource distribution and discontinuous raw material supply by adding compressed air energy storage technology. Since the system of the present invention realizes the multi-energy complementarity of compressed air energy storage and biomass energy, in the case of energy input fluctuations or unbalanced demand, it can ensure the continuity and reliability of energy supply through flexible scheduling and mutual complementation of the two energy forms. In addition, the system of the present invention can also adjust the operating mode according to different application scenarios to adapt to diverse energy needs and has a wider applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above features and advantages of the present invention will be better understood after reading the detailed description of the embodiments of the present disclosure in conjunction with the following drawings. In the drawings, the components are not necessarily drawn to scale, and components with similar related properties or characteristics may have the same or similar reference numerals.

[0023] Figure 1 A schematic diagram of an embodiment of the multi-energy complementary system based on compressed air energy storage and biomass energy of the present invention is shown.

[0024] Reference numerals

[0025] 1 is the first motor,

[0026] 2 is the first air compressor

[0027] 3 is the first heat exchanger

[0028] 4 is the second motor

[0029] 5 is the second air compressor

[0030] 6 is the second heat exchanger

[0031] 7 is the third motor

[0032] 8 is the third air compressor

[0033] 9 is the third heat exchanger

[0034] 10 is the fourth motor

[0035] 11 is the fourth air compressor

[0036] 12 is the fourth heat exchanger

[0037] 13 is the fifth heat exchanger

[0038] 14 is the high-pressure gas tank

[0039] 15 is the pressure reducing valve

[0040] 16 is the sixth heat exchanger

[0041] 17 is the first adiabatic expander

[0042] 18 is the first generator

[0043] 19 is the seventh heat exchanger

[0044] 20 is the second adiabatic expander

[0045] 21 is the second generator

[0046] 22 is the eighth heat exchanger

[0047] 23 is the third adiabatic expander

[0048] 24 is the third generator

[0049] 25 is hot air dryer

[0050] 26 is the biomass gasifier

[0051] 27 is a cyclone separator

[0052] 28 is the synthesizer tank

[0053] 29 is a dual-fuel engine fueled by synthesis gas and diesel

[0054] 30 is the first circulating water heat exchanger

[0055] 31 is the second circulating water heat exchanger

[0056] 32 is the first heating circulation pump

[0057] 33 is the second heating circulation pump DETAILED DESCRIPTION

[0058] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Note that the various aspects described below with reference to the accompanying drawings and specific embodiments are merely exemplary and should not be construed as limiting the scope of protection of the present invention.

[0059] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0060] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0061] Figure 1 The principle of an embodiment of the multi-energy complementary system based on compressed air energy storage and biomass energy of the present invention is shown. Figure 1 The system of this embodiment mainly consists of the following three parts: a compressed air energy storage unit, a biomass energy unit and a heat circulation unit.

[0062] The compressed air energy storage unit is used to store the input electrical energy in compressed air and release the energy in the compressed air through an expander to generate electricity and recover heat.

[0063] The compressed air energy storage unit includes a first air compressor 2, a first heat exchanger 3, a second air compressor 5, a second heat exchanger 6, a third air compressor 8, a third heat exchanger 9, a fourth air compressor 11, a fourth heat exchanger 12, a fifth heat exchanger 13, a high-pressure air storage tank 14, a pressure reducing valve 15, a sixth heat exchanger 16, a first adiabatic expander 17, a first generator 18, a seventh heat exchanger 19, a second adiabatic expander 20, a second generator 21, an eighth heat exchanger 22, a third adiabatic expander 23 and a third generator 24, which are connected in sequence.

[0064] The above structure of the compressed air energy storage unit mainly includes four parts: air compressor and heat exchanger, high-pressure air storage tank, expander and generator, and first waste heat recovery.

[0065] In the local structure of the air compressor and heat exchanger, the first air compressor 2 is driven by the first motor 1 to perform preliminary compression on the air. The compressed air then enters the first heat exchanger 3 for cooling. The air cooled by the first heat exchanger enters the second air compressor 5, driven by the second motor 4 for further compression, and then enters the second heat exchanger 6 for cooling.

[0066] Similarly, the air passes through the third air compressor 8, the third heat exchanger 9, the fourth air compressor 11 and the fourth heat exchanger 12 in sequence to be compressed and cooled step by step.

[0067] In the local structure of the high-pressure gas storage tank, the high-pressure air cooled by the fourth heat exchanger 12 enters the high-pressure gas storage tank 14 for storage.

[0068] In the local structure of the expander and generator, the high-pressure air in the high-pressure gas storage tank 14 is reduced in pressure by the pressure reducing valve 15, and then passes through the sixth heat exchanger 16, the first adiabatic expander 17, the seventh heat exchanger 19, the second adiabatic expander 20, the eighth heat exchanger 22 and the third adiabatic expander 23 in sequence to expand and perform work.

[0069] The first adiabatic expander 17 , the second adiabatic expander 20 and the third adiabatic expander 23 drive the first generator 18 , the second generator 21 and the third generator 24 respectively to convert mechanical energy into electrical energy for output.

[0070] In the local structure of the first waste heat recovery, the tail gas of the third adiabatic expander 23 passes through the second circulating water heat exchanger 31, and the circulating water system is used to recover waste heat for heating the circulation unit.

[0071] The biomass energy unit is used to generate syngas from biomass gasification as fuel, providing electricity output and waste heat recovery through combustion.

[0072] The biomass energy unit includes a hot air dryer 25, a biomass gasifier 26, a cyclone separator 27, a synthesis gas storage tank 28 and a dual-fuel engine 29 which are connected in sequence.

[0073] The above structure of the biomass energy unit mainly includes three parts: biomass pretreatment and gasification, synthesis gas storage and combustion, and secondary waste heat recovery.

[0074] In the local structure of biomass pretreatment and gasification, the biomass first enters the hot air dryer 25 for drying to reduce the moisture content, and then enters the biomass gasifier 26 for gasification reaction to generate high calorific value synthesis gas.

[0075] The generated high-temperature synthesis gas enters the hot flow inlet of the fourth heat exchanger 12 and exchanges heat with the high-pressure air. After the cooled synthesis gas comes out from the hot flow outlet of the fourth heat exchanger 12, it enters the cyclone separator 27 to remove solid particles.

[0076] In the local structure for syngas storage and combustion, the purified syngas is stored in a syngas storage tank 28 and mixed with diesel to be supplied to a dual-fuel engine 29 as fuel.

[0077] The dual-fuel engine 29 burns the synthesis gas and diesel to generate power to drive the generator to generate electricity, and at the same time produces high-temperature exhaust gas.

[0078] In the second waste heat recovery local structure, the exhaust gas of the dual-fuel engine 29 first enters the hot flow inlet end of the eighth heat exchanger 22, and the hot flow outlet end is connected to the hot flow inlet end of the seventh heat exchanger 19 to further recover and utilize the waste heat of the exhaust gas.

[0079] When the dual-fuel engine 29 is running, the high-temperature coolant in the cooling system exchanges heat with the circulating water through the first circulating water heat exchanger 30, and the waste heat is recovered to the heat supply circulation unit.

[0080] The heat supply circulation unit is used to recover the waste heat generated by the compressed air energy storage unit and the biomass energy unit, and transmit the heat to an external heat user end.

[0081] The heat supply circulation unit includes a first circulating water heat exchanger 30, a second circulating water heat exchanger 31, a first heat supply circulation pump 32, and a second heat supply circulation pump 33. The first circulating water heat exchanger 30 is used to recover the waste heat of the cooling water of the dual-fuel engine 29, the second circulating water heat exchanger 31 is used to recover the waste heat of the expanded exhaust gas, the first heat supply circulation pump 32 is used to transport cold water to the compressed air energy storage unit and the biomass energy unit for heat recovery, and the second heat supply circulation pump 33 is used to transport the heated circulating water to the heat user end.

[0082] The above structure of the heating circulation unit mainly includes two parts: third waste heat recovery and hot water delivery.

[0083] In the third waste heat recovery partial structure, the first circulating water heat exchanger 30 is used to recover waste heat from the cooling system of the dual-fuel engine 29. The second circulating water heat exchanger 31 is used to recover waste heat from the tail gas of the third adiabatic expander 23.

[0084] In the local structure of hot water delivery, the first heat supply circulation pump 32 is responsible for delivering cold water to the first circulating water heat exchanger 30 and the second circulating water heat exchanger 31 for heat recovery.

[0085] The second heat supply circulation pump 33 delivers the hot water recovered by the first circulating water heat exchanger 30 and the second circulating water heat exchanger 31 to the heat user end to meet the external heating demand.

[0086] The connections between the compressed air energy storage unit, the biomass energy unit, and the heat supply circulation unit are as follows. Between the compressed air energy storage unit and the biomass energy unit, the outlet of the biomass gasifier 26 of the biomass energy unit is connected to the hot stream inlet of the fourth heat exchanger 12 in the compressed air energy storage unit, which is used to cool the synthesis gas and improve gasification efficiency. The exhaust outlet of the biomass energy unit's dual-fuel engine 29 passes through the hot streams of the eighth heat exchanger 22 and the seventh heat exchanger 19, respectively, to recover the exhaust waste heat and increase the inlet temperature of the second adiabatic expander 20 and the third adiabatic expander 23 in the compressed air energy storage unit, thereby improving expansion efficiency and power generation efficiency.

[0087] Between the heating circulation unit, the compressed air energy storage unit, and the biomass energy unit, the heating circulation unit's first circulating water heat exchanger 30 is connected to the cooling system of the dual-fuel engine 29 in the biomass energy unit to recover waste heat from the dual-fuel engine 29's cooling system. The heating circulation unit's second circulating water heat exchanger 31 is connected to the outlet of the third adiabatic expander 23 in the compressed air energy storage unit to recover waste heat from the exhaust gas of the third adiabatic expander 23. The heating circulation unit transmits the recovered heat to the heat user via the first and second heating circulation pumps 32, 33, to meet external heating needs and reduce the system's energy consumption and operating costs.

[0088] As an embodiment of a multi-energy complementary system based on compressed air energy storage and biomass energy, the operation process of the entire system is as follows.

[0089] The first motor 1 drives the first air compressor 2, which performs preliminary compression on the ambient air. The resulting high-temperature air enters the first heat exchanger 3 and, after cooling, enters the second air compressor 5. Similarly, the second air compressor 5 is driven by the second motor 4. The compressed air passes through the second heat exchanger 6 for cooling. After cooling, it enters the third air compressor 8. The third air compressor 8 is driven by the third motor 7, and its outlet is connected to the inlet of the third heat exchanger 9. After cooling, it enters the fourth air compressor 11 for a fourth pressurization. The fourth air compressor 11 is driven by the fourth motor 10. The outlet of the fourth air compressor 11 is connected to the cold stream inlet of the fourth heat exchanger 12, and the cold stream outlet is connected to the storage inlet of the high-pressure air storage tank 14. The compressed air stored in the high-pressure air storage tank 14 is reduced in pressure by the pressure reducing valve 15, and then passes through the sixth heat exchanger 16, the first adiabatic expander 17, the seventh heat exchanger 19, the second adiabatic expander 20, and the eighth heat exchanger 22 in sequence, and finally enters the third adiabatic expander 23. The expanders drive the first, second, and third generators 18, 21, and 24, respectively, generating electricity and supplying it to the electricity user. After each stage of expansion, the air is heated by the cold stream inlet of the heat exchangers (the sixth, seventh, and eighth heat exchangers 16, 19, and 22), helping to improve expansion efficiency and thus the overall power generation efficiency of the system. The exhaust gas from the third adiabatic expander 23 passes through the second circulating water heat exchanger 31, where the waste heat is recovered by the circulating water system and used for the heating unit.

[0090] The biomass in the biomass energy unit first enters the hot air dryer 25, and after drying, enters the biomass gasifier 26. In the gasifier 26, the fuel reacts with the gasifying agent (ambient air) at high temperature to produce a high-calorific value synthesis gas; the generated high-temperature synthesis gas enters the hot flow stream inlet of the fourth heat exchanger 12 in the compressed air energy storage unit to exchange heat with the high-pressure air. After the cooled synthesis gas exits the hot flow stream outlet of the fourth heat exchanger 12, it enters the cyclone separator 27 to further remove solid particulate matter. The purified synthesis gas is stored in the synthesis gas storage tank 28. The synthesis gas is mixed with diesel as fuel for the dual-fuel engine 29, which burns to generate power to drive the generator to generate electricity and simultaneously produces high-temperature exhaust gas. The exhaust gas first enters the hot flow stream inlet of the eighth heat exchanger 22, and the hot flow stream outlet is connected to the hot flow stream inlet of the seventh heat exchanger 19 to further recover and utilize the waste heat of the exhaust gas. When the dual-fuel engine is running, the high-temperature coolant in the cooling system exchanges heat with the circulating water through the first circulating water heat exchanger 30, and the waste heat is recovered to the heating unit.

[0091] The first heat supply circulation pump 32 in the heating unit is responsible for transporting cold water to the first circulating water heat exchanger 30 and the second circulating water heat exchanger 31, which are respectively used to recover the waste heat of the exhaust gas of the third adiabatic expander 23 of the compressed air energy storage unit and the waste heat of the cooling system of the dual-fuel engine 29 in the biomass energy unit. The second heat supply circulation pump 33 transports the hot water recovered through the first circulating water heat exchanger 30 and the second circulating water heat exchanger 31 to the heat user end to meet external heating needs.

[0092] The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-energy complementary system based on compressed air energy storage and biomass energy, characterized in that: include: Compressed air energy storage unit, used to store the input electrical energy in compressed air and release the energy in the compressed air through an expander to generate electricity and recover heat; Biomass energy unit, which is used to generate syngas from biomass gasification as fuel, provide power output and waste heat recovery through combustion; The heat supply circulation unit is used to recover the waste heat generated by the compressed air energy storage unit and the biomass energy unit, and transmit the heat to an external heat user end.

2. The multi-energy complementary system based on compressed air energy storage and biomass energy according to claim 1 is characterized in that: The compressed air energy storage unit includes a first air compressor, a first heat exchanger, a second air compressor, a second heat exchanger, a third air compressor, a third heat exchanger, a fourth air compressor, a fourth heat exchanger, a fifth heat exchanger, a high-pressure air storage tank, a pressure reducing valve, a sixth heat exchanger, a first adiabatic expander, a first generator, a seventh heat exchanger, a second adiabatic expander, a second generator, an eighth heat exchanger, a third adiabatic expander and a third generator, which are connected in sequence.

3. The multi-energy complementary system based on compressed air energy storage and biomass energy according to claim 2 is characterized in that: The structure of the compressed air energy storage unit includes four parts: air compressor and heat exchanger, high-pressure air storage tank, expander and generator, and the first waste heat recovery.

4. The multi-energy complementary system based on compressed air energy storage and biomass energy according to claim 2 is characterized in that: The biomass energy unit includes a hot air dryer, a biomass gasifier, a cyclone separator, a synthesis gas storage tank and a dual-fuel engine which are connected in sequence.

5. The multi-energy complementary system based on compressed air energy storage and biomass energy according to claim 4 is characterized in that: The structure of the biomass energy unit includes three parts: biomass pretreatment and gasification, synthesis gas storage and combustion, and secondary waste heat recovery.

6. The multi-energy complementary system based on compressed air energy storage and biomass energy according to claim 4 is characterized in that: The heating circulation unit includes a first circulating water heat exchanger, a second circulating water heat exchanger, a first heating circulation pump and a second heating circulation pump, wherein the first circulating water heat exchanger is used to recover the waste heat of the cooling water of the dual-fuel engine, the second circulating water heat exchanger is used to recover the waste heat of the expanded exhaust gas, the first heating circulation pump is used to transport cold water to the compressed air energy storage unit and the biomass energy unit for heat recovery, and the second heating circulation pump is used to transport the heated circulating water to the heat user end.

7. The multi-energy complementary system based on compressed air energy storage and biomass energy according to claim 6 is characterized in that: The structure of the heating circulation unit includes two parts: third waste heat recovery and hot water delivery.

8. The multi-energy complementary system based on compressed air energy storage and biomass energy according to claim 6 is characterized in that: The high-pressure gas storage tank in the compressed air energy storage unit is connected to the biomass gasifier in the biomass energy unit through the hot flow stream of the fourth heat exchanger, which is used to cool the synthesis gas and improve the gasification efficiency.

9. The multi-energy complementary system based on compressed air energy storage and biomass energy according to claim 8 is characterized in that: The exhaust gas outlet of the dual-fuel engine of the biomass energy unit passes through the hot flow streams of the eighth heat exchanger and the seventh heat exchanger in sequence, which is used to recover the waste heat of the exhaust gas and increase the inlet temperature of the second adiabatic expander and the third adiabatic expander, thereby improving the expansion efficiency and power generation efficiency.

10. The multi-energy complementary system based on compressed air energy storage and biomass energy according to claim 9 is characterized in that: The first circulating water heat exchanger of the heating circulation unit is used to recover the waste heat of the dual-fuel engine cooling system, and the second circulating water heat exchanger is used to recover the waste heat of the exhaust gas of the third adiabatic expander, and the recovered heat is transferred to the heat user end through the second circulating water pump to reduce the system's energy consumption and operating costs.

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