Liquid air energy storage coupling system

Abstract

The invention relates to the technical field of liquid air energy storage, and discloses a liquid air energy storage coupling system. The liquid air energy storage coupling system comprises a liquid air energy storage subsystem and a biomass gasification subsystem. The liquid air energy storage subsystem comprises a compressor unit, a heat storage unit, a cold storage unit and a turbine unit. And the biomass gasification subsystem comprises a biomass gasification furnace. And an air inlet of the heat storage unit is communicated with an air outlet of the air compressor unit. And the cold storage unit communicates with the heat storage unit. An air outlet of the heat storage unit communicates with an air inlet of the turbine unit and is used for conveying high-temperature air to the turbine unit, the high-temperature air enters the turbine unit to drive the power generator to generate power, and an air outlet of the turbine unit is used for discharging cooled air. And a gasifying agent inlet of the biomass gasifier is communicated with an air outlet of the turbine unit. Resource utilization of clean air at the outlet of the liquid air energy storage system can be achieved, and the system efficiency of the liquid air energy storage system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid air energy storage, and in particular to a liquid air energy storage coupling system. Background Art

[0002] Carbon emission reduction in the power industry has become an important direction for future development. The installed capacity of new energy power generation such as wind power generation and photovoltaic power generation has increased year by year. At the same time, new power generation technologies such as biomass gasification power generation technology have developed rapidly.

[0003] The rapid increase in the installed capacity of new energy sources such as wind power generation and photovoltaic power generation has brought about an urgent need for new energy storage technologies. "New energy storage" includes compressed air energy storage, liquid flow energy storage, flywheel energy storage, gravity energy storage, liquid air energy storage, etc. Among them, liquid air energy storage technology has outstanding advantages such as large scale, long-term effectiveness, environmental friendliness, safety and stability, long life, flexible layout, and providing rotational inertia support, becoming one of the most promising and competitive new long-term energy storage technologies.

[0004] Liquid air energy storage technology is a new type of energy storage technology that uses liquid air to store and release energy. In the energy storage stage, the air is compressed and cooled, then enters the cold box for cooling and liquefaction, and the resulting liquid air is stored in the liquid air storage tank; in the energy release stage, the liquid air is reheated and vaporized in the cold box, then enters the heat exchanger for heating, and then enters the expander or turbine to drive the generator to generate electricity.

[0005] The liquid air energy storage coupling system is more conducive to the improvement of system efficiency, energy storage scale / duration, and the effective use of cold energy and clean air resources. At present, a variety of liquid air energy storage coupling systems have been proposed, including liquefied natural gas (LNG) cold energy-liquid air energy storage, ethylene cold energy-liquid air energy storage, air separation-liquid air energy storage, synthetic ammonia-liquid air energy storage, hydrogen energy-liquid air energy storage, etc. However, both the single liquid air energy storage system and the liquid air energy storage coupling system have the problem of low resource utilization rate. Summary of the invention

[0006] The present invention provides a liquid air energy storage coupling system, which is used to solve the problem of low resource utilization rate existing in both the single liquid air energy storage system and the liquid air energy storage coupling system in the prior art.

[0007] The present invention provides a liquid air energy storage coupling system, comprising a liquid air energy storage subsystem and a biomass gasification subsystem;

[0008] The liquid air energy storage subsystem comprises:

[0009] Air compressor unit;

[0010] a heat storage unit, wherein an air inlet of the heat storage unit is in communication with an air outlet of the air compressor unit;

[0011] A cold storage unit, the cold storage unit being in communication with the heat storage unit;

[0012] The air outlet of the heat storage unit is connected to the air inlet of the turbine unit, and is used to deliver high-temperature air to the turbine unit. The high-temperature air enters the turbine unit to drive the generator to generate electricity and cool down. The air outlet of the turbine unit is used to discharge the cooled air.

[0013] The biomass gasification subsystem comprises:

[0014] A biomass gasifier, wherein the gasifying agent inlet of the biomass gasifier is connected to the air outlet of the turbine unit.

[0015] The liquid air energy storage coupling system provided by the present invention further includes:

[0016] a second air inlet pipe, wherein two ends of the second air inlet pipe are respectively connected to the air outlet of the air compressor unit and the gasifying agent inlet of the biomass gasifier, and a second switch valve is installed on the second air inlet pipe;

[0017] or / and;

[0018] The third air inlet pipe has two ends connected to the gasifying agent inlet of the cold storage unit and the biomass gasifier respectively, and is used to transport the reheated air discharged from the cold storage unit to the biomass gasifier; the third air inlet pipe is equipped with a third switch valve.

[0019] The liquid air energy storage coupling system provided by the present invention further includes:

[0020] A heat storage component, wherein the synthesis gas inlet of the heat storage component is connected to the synthesis gas outlet of the biomass gasifier, and the synthesis gas outlet of the heat storage component is used to discharge the synthesis gas after cooling; the heat storage component is connected to the heat storage unit to form a heat exchange medium circulation loop; the synthesis gas entering the heat storage component is used to heat the heat exchange medium to increase the temperature of the heat exchange medium.

[0021] According to the liquid air energy storage coupling system provided by the present invention, the heat storage unit comprises:

[0022] A first cooler, wherein an air inlet of the first cooler is communicated with an air outlet of the air compressor unit, and an air outlet of the first cooler is communicated with an air inlet of the cold storage unit;

[0023] a high-temperature medium storage tank, wherein a heat storage medium inlet of the high-temperature medium storage tank is connected to a heat storage medium outlet of the first cooler;

[0024] a low-temperature medium storage tank, wherein a heat storage medium outlet of the low-temperature medium storage tank is in communication with a heat storage medium inlet of the first cooler;

[0025] A heat exchanger, wherein the heat storage medium inlet of the heat exchanger is connected to the heat storage medium outlet of the high-temperature medium storage tank, the heat storage medium outlet of the heat exchanger is connected to the heat storage medium inlet of the low-temperature medium storage tank, the air inlet of the heat exchanger is connected to the air outlet of the cold storage unit, and the air outlet of the heat exchanger is connected to the air inlet of the turbine unit; the heat exchange medium inlet of the heat exchanger is connected to the heat exchange medium outlet of the heat storage component, and the heat exchange medium outlet of the heat exchanger is connected to the heat exchange medium inlet of the heat storage component to form a heat exchange medium circulation loop.

[0026] According to the liquid air energy storage coupling system provided by the present invention, the biomass gasification subsystem further includes:

[0027] A synthesis gas storage tank is connected to the synthesis gas outlet of the heat storage component and is used to store the synthesis gas after cooling.

[0028] The liquid air energy storage coupling system provided by the present invention further includes:

[0029] a power generation subsystem, the power generation subsystem being in communication with the synthesis gas storage tank;

[0030] or / and;

[0031] A chemical substance production subsystem is connected to the synthesis gas storage tank.

[0032] According to the liquid air energy storage coupling system provided by the present invention, the heat storage component includes a heat accumulator; the heat accumulator has a accommodating cavity, a first heat exchange tube and a second heat exchange tube; the accommodating cavity is filled with a solid-phase heat storage medium; the first heat exchange tube and the second heat exchange tube are buried in the solid-phase heat storage medium, the first heat exchange tube is used to transport synthesis gas, and the second heat exchange tube is used to transport heat exchange medium.

[0033] According to the liquid-air energy storage coupling system provided by the present invention, the heat storage unit has a heat storage cavity filled with a solid-phase heat storage medium, and the cold storage unit has a cold storage cavity filled with a solid-phase cold storage medium.

[0034] According to the liquid-air energy storage coupling system provided by the present invention, the heat storage unit and the cold storage unit are both buried underground.

[0035] According to the liquid air energy storage coupling system provided by the present invention, the biomass gasifier is a fluidized bed gasifier.

[0036] The liquid air energy storage coupling system provided by the present invention can realize the reuse of the air discharged from the turbine unit by connecting the air outlet of the turbine unit with the gasifying agent inlet of the biomass gasification furnace of the biomass gasification subsystem, realize the resource utilization of the clean air of the liquid air energy storage system, improve the system efficiency of the liquid air energy storage system, and solve the problem of low resource utilization rate existing in both the separate liquid air energy storage system and the liquid air energy storage coupling system in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 This is one of the structural schematic diagrams of a liquid air energy storage coupling system provided by the present invention.

[0039] Figure 2 This is the second structural schematic diagram of a liquid air energy storage coupling system provided by the present invention.

[0040] Figure 3 This is the third structural schematic diagram of a liquid air energy storage coupling system provided by the present invention.

[0041] Figure 4 It is a structural schematic diagram of a liquid air energy storage subsystem of a liquid air energy storage coupling system provided by the present invention.

[0042] Figure 5 It is one of the structural schematic diagrams of the heat storage unit provided by the present invention;

[0043] Figure 6 yes Figure 5 One of the cross-sectional structural diagrams of the medium heat storage unit.

[0044] Figure 7 yes Figure 6 The second schematic diagram of the cross-sectional structure of the middle heat storage unit.

[0045] Figure 8 This is the second structural schematic diagram of the heat storage unit provided by the present invention.

[0046] Reference numerals:

[0047] 100, heat storage unit; 110, heat storage chamber; 120, inner shell; 130, outer shell; 140, filling gap; 111, first straight line segment; 112, second straight line segment; 113, arc segment; 131, recessed portion; 10, first cooler; 20, high-temperature medium storage tank; 30, low-temperature medium storage tank; 40, heat exchanger;

[0048] 200. Cold storage unit;

[0049] 310, gas reflux pipe; 320, coil; 330, return pipe; 340, fifth valve body;

[0050] 400, pressure reduction assembly; 410, liquid expander; 420, throttle valve;

[0051] 500. Liquid air storage tank;

[0052] 600, energy release assembly; 610, cryogenic pump; 620, energy release gas transmission pipe; 630, turbine unit; 640, sixth valve body;

[0053] 700, energy storage assembly; 710, air compressor unit; 720, first air transmission pipe; 730, first valve body;

[0054] 810, second gas transmission pipe; 820, third valve body;

[0055] 910, second valve body; 920, fourth valve body;

[0056] 50. Biomass gasifier;

[0057] 60. Synthesis gas storage tank;

[0058] 70. Raw material supply assembly; 71. Biomass storage bin; 72. Cutting and shaping machine; 73. Hopper; 74. Belt conveyor; 75. Crushing bin; 76. Lock hopper;

[0059] 80. Synthesis gas purification component; 81. Cyclone separator; 82. Tar reformer;

[0060] 1. First air intake pipe; 2. Second air intake pipe; 3. Third air intake pipe; 4. First switch valve; 5. Second switch valve; 6. Third switch valve; 7. Power generation subsystem; 8. Chemical substance production subsystem;

[0061] 90. heat storage component; 91. heat storage device; 92. blower. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0063] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0064] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0065] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0067] Combine the following Figures 1 to 8 The structure and working principle of the liquid air energy storage coupling system of the present invention are described in detail.

[0068] like Figures 1 to 3 As shown, a specific embodiment of the present invention provides a liquid air energy storage coupling system. The liquid air energy storage coupling system includes a liquid air energy storage subsystem and a biomass gasification subsystem. The liquid air energy storage subsystem includes a compressor unit, a heat storage unit 100, a cold storage unit 200 and a turbine unit 630. The biomass gasification subsystem includes a biomass gasifier 50.

[0069] The air inlet of the heat storage unit 100 is connected to the air outlet of the air compressor unit 710. The cold storage unit 200 is connected to the heat storage unit 100. The air outlet of the heat storage unit 100 is connected to the air inlet of the turbine unit 630, which is used to transport high-temperature air to the turbine unit 630. The high-temperature air enters the turbine unit 630 to drive the generator to generate electricity. The air outlet of the turbine unit 630 is used to discharge the cooled air. The gasification agent inlet of the biomass gasifier 50 is connected to the air outlet of the turbine unit 630.

[0070] Specifically, in the energy storage stage, the air compressor unit 710 compresses air at normal temperature and pressure into high-temperature and high-pressure air, and the high-temperature and high-pressure air enters the thermal storage unit 100. The thermal storage unit 100 is used to store the compression heat of the air. The cooled high-pressure air enters the cold storage unit 200. The cold storage unit 200 precools the compressed air discharged from the thermal storage unit 100 to liquefy the compressed air. In the energy release stage, the cold storage unit 200 is used to reheat the liquid air. The reheated air enters the thermal storage unit 100. At this time, the thermal storage unit 100 is used to reheat the air discharged from the cold storage unit 200 to gasify the liquid air into high-temperature air. The high-temperature air enters the turbine unit 630 to drive the generator to generate electricity. At the same time, the air outlet of the turbine unit 630 discharges the cooled air. Because the air outlet of the turbine unit 630 is connected to the gasification agent inlet of the biomass gasifier 50, the cooled air enters the biomass gasifier 50.

[0071] In this embodiment, by connecting the air outlet of the turbine unit 630 with the gasifying agent inlet of the biomass gasification furnace 50 of the biomass gasification subsystem, the air discharged from the turbine unit 630 can be reused, the clean air of the liquid air energy storage system can be utilized as a resource, the system efficiency of the liquid air energy storage system is improved, and the problem of low resource utilization rate existing in both the separate liquid air energy storage system and the liquid air energy storage coupling system in the prior art is solved.

[0072] It should be noted that the heat storage unit 100 can be solid-phase heat storage or liquid-phase heat storage; the cold storage unit 200 can be solid-phase cold storage or liquid-phase cold storage. Solid-phase heat storage means that the medium used by the heat storage unit 100 to store compression heat is a solid-phase heat storage medium. Liquid-phase heat storage means that the medium used by the heat storage unit 100 to store compression heat is a liquid-phase heat storage medium. Solid-phase cold storage means that the medium used by the cold storage unit 200 to store cold is a solid-phase cold storage medium. Liquid-phase cold storage means that the medium used by the cold storage unit 200 to store cold is a liquid-phase cold storage medium.

[0073] It should be noted that in the specific embodiments of the present invention, there is no limitation on the shapes of the thermal storage unit 100 and the cold storage unit 200. For example, the thermal storage unit 100 and the cold storage unit 200 may be cylindrical or U-shaped. Similarly, in the specific implementation of the present invention, the thermal storage unit 100 and the cold storage unit 200 may be buried underground or placed on the ground.

[0074] Combine the following Figures 1 to 8 The liquid-phase air energy storage subsystem of the present invention is described in detail.

[0075] Embodiment 1

[0076] like Figure 1As shown, the thermal storage unit 100 includes a first cooler 10, a high-temperature medium storage tank 20, a low-temperature medium storage tank 30 and a heat exchanger 40. The air inlet of the first cooler 10 is connected to the air outlet of the air compressor unit 710, and the air outlet of the first cooler 10 is connected to the air inlet of the thermal storage unit 200; the thermal storage medium inlet of the first cooler 10 is connected to the thermal storage medium outlet of the low-temperature medium storage tank 30, and the thermal storage medium outlet of the first cooler 10 is connected to the thermal storage medium inlet of the high-temperature medium storage tank 20. The thermal storage medium outlet of the high-temperature medium storage tank 20 is connected to the thermal storage medium inlet of the low-temperature medium storage tank 30. The thermal storage medium inlet of the heat exchanger 40 is connected to the thermal storage medium outlet of the high-temperature medium storage tank 20, the thermal storage medium outlet of the heat exchanger 40 is connected to the thermal storage medium inlet of the low-temperature medium storage tank 30, the air inlet of the heat exchanger 40 is connected to the air outlet of the thermal storage unit 200, and the air outlet of the heat exchanger 40 is connected to the air inlet of the turbine unit 630. The high-temperature and high-pressure air discharged from the air compressor unit 710 enters the first cooler 10 to exchange heat with the low-temperature heat storage medium discharged from the low-temperature medium storage tank 30. The low-temperature heat storage medium is heated up and transformed into a high-temperature heat storage medium and enters the high-temperature medium storage tank 20 for storage. The cooled air enters the cold storage unit 200 for liquefaction, thus realizing the storage of compression heat. By setting up the heat exchanger 40, it is possible to further heat the reheated air discharged from the cold storage unit 200, so that the air is heated up and becomes high-temperature air, and the high-temperature air enters the turbine unit 630 to drive the generator to generate electricity. It can be understood that the heat storage medium at this time is a liquid phase heat storage medium or a gas phase heat storage medium.

[0077] Furthermore, the heat exchange medium inlet of the heat exchanger 40 is connected to the heat exchange medium outlet of the heat storage component 90, and the heat exchange medium outlet of the heat exchanger 40 is connected to the heat exchange medium inlet of the heat storage component 90 to form a heat exchange medium circulation loop. The heat exchange medium enters the heat storage component 90 to exchange heat with the synthesis gas, the heat exchange medium temperature increases, the synthesis gas temperature decreases, and the heat exchange medium enters the heat exchanger 40 to exchange heat with the reheated air discharged from the cold storage unit 200, which is used to further heat the air, so that the high-temperature air enters the turbine unit 630. The heat of biomass gasification can be recycled and utilized, and the system efficiency of the liquid-phase air energy storage subsystem can be improved.

[0078] Furthermore, the heat storage assembly 90 includes a heat storage tank 91 and a blower 92; an air circulation loop is formed between the heat storage tank 91 and the heat storage unit 100, and the blower 92 is arranged on the air flow path between the heat storage tank 91 and the heat storage unit 100 to provide air to the circulation loop. The synthesis gas inlet of the heat storage tank 91 is connected to the gasification agent outlet of the biomass gasifier 50, and the synthesis gas outlet of the heat storage tank 91 is used to discharge the synthesis gas after cooling. Using air as a heat exchange medium has advantages such as environmental protection, safety and economy.

[0079] Specifically, the heat exchange medium inlet of the heat exchanger 40 is connected to the heat exchange medium outlet of the heat accumulator 91, and the heat exchange medium outlet of the heat exchanger 40 is connected to the heat exchange medium inlet of the heat accumulator 91 to form a heat exchange medium circulation loop. In this way, the synthesis gas can heat the heat exchange medium, and the heat exchange medium heats the reheated air discharged from the cold storage unit 200 in the heat exchanger 40, thereby realizing the recovery and utilization of the biomass gasification heat and improving the efficiency of the liquid air energy storage subsystem.

[0080] Embodiment 2

[0081] like Figures 2 to 4 As shown, the heat storage unit 100 includes a heat storage chamber 110; the heat storage chamber 110 is filled with a solid-phase heat storage medium. High-temperature and high-pressure air enters the heat storage chamber 110 and directly contacts the solid-phase heat storage medium, and the solid-phase heat storage medium stores the compression heat. The cooled air enters the cold storage unit 200. In this embodiment, heat storage is performed in the form of direct heat exchange between air and solid-phase heat storage medium. Compared with the form of indirect heat exchange using circulating air, the system efficiency is higher; compared with the form of indirect heat exchange using chemical media such as thermal oil, methanol, and propane, no flammable and explosive chemicals are used, and the system is more environmentally friendly and safer.

[0082] Specifically, the solid phase heat storage medium includes high temperature and high pressure resistant solid phase heat storage materials such as concrete, rock or gravel.

[0083] Further, the heat exchange medium inlet of the heat storage assembly 90 is communicated with the heat exchange medium outlet of the heat storage chamber 110, and the heat exchange medium outlet of the heat storage assembly 90 is communicated with the heat exchange medium inlet of the heat storage chamber 110. Specifically, the heat exchange medium inlet of the heat accumulator 91 is communicated with the heat exchange medium outlet of the heat storage chamber 110, and the heat exchange medium outlet of the heat accumulator 91 is communicated with the heat exchange medium inlet of the heat storage chamber 110. At this time, the heat exchange medium directly exchanges heat with the solid phase heat storage medium in the heat storage chamber 110, and the solid phase heat storage medium stores the heat of the heat exchange medium, thereby improving the efficiency of the liquid air energy storage subsystem.

[0084] like Figures 2 to 4 As shown, further, the heat storage unit 100 and the cold storage unit 200 are buried underground. In this embodiment, by burying the heat storage unit 100 and the cold storage unit 200 underground, not only the floor space is effectively reduced, the construction cost is greatly reduced compared to the ground high-pressure heat storage and cold storage, and the safety hazards caused by the ground high-pressure equipment are avoided, the safety of the system is improved, and the current liquid air energy storage technology has safety hazards in the heat storage and cold storage unit 200 and occupies a large area.

[0085] Specifically, the liquid air energy storage subsystem includes a thermal storage unit 100 and a cold storage unit 200; both the thermal storage unit 100 and the cold storage unit 200 are buried underground; the cold storage unit 200 is connected to the thermal storage unit 100 by air. In the energy storage stage, the thermal storage unit 100 is used to store compression heat, and the cold storage unit 200 is used to pre-cool the compressed air discharged from the thermal storage unit 100 to liquefy the compressed air. In the energy release stage, the cold storage unit 200 is used to reheat the liquid air, and the thermal storage unit 100 is used to reheat the air discharged from the cold storage unit 200 to vaporize the liquid air. Specifically, in the energy storage stage, high-temperature and high-pressure compressed air enters the thermal storage unit 100, stores the compression heat in the thermal storage unit 100, and the cooled high-pressure air enters the cold storage unit 200, and is further cooled and liquefied by the cold storage unit 200 to obtain high-pressure liquid air. During the heat release stage, liquid air at normal pressure enters the cold storage unit 200 for vaporization and reheating, and the reheated air enters the heat storage unit 100 for further heating and vaporization, and finally the heated air is used for power generation.

[0086] Furthermore, the second end of the heat storage unit 100 is connected to the first end of the cold storage unit 200 through the second gas pipeline 810. A third valve body 820 is provided on the second gas pipeline 810, and the third valve body 820 is used to control the on-off of the gas path of the second gas pipeline 810. In the intermittent stage of energy storage and release, the third valve body 820 is closed.

[0087] It should be noted that in the specific embodiments of the present invention, there is no limitation on the number of thermal storage units 100 and cold storage units 200. When the liquid air energy storage subsystem includes multiple thermal storage units 100, the multiple thermal storage units 100 can be connected in parallel or in series. When the liquid air energy storage subsystem includes multiple cold storage units 200, the multiple cold storage units 200 can be connected in parallel or in series.

[0088] Taking multiple thermal storage units 100 connected in parallel as an example, the first ends of the multiple thermal storage units 100 are all connected to the air outlet of the air compressor unit 710, the second ends of the multiple thermal storage units 100 are all connected to the air inlet of the second air pipe 810, and the air outlet of the second air pipe 810 is connected to the first end of the cold storage unit 200. At this time, the high-temperature and high-pressure air discharged from the air compressor unit 710 can enter the multiple thermal storage units 100 at the same time, and then can be discharged from the multiple thermal storage units 100 at the same time, and enter the cold storage unit 200 through the second air pipe 810.

[0089] Taking multiple heat storage units 100 connected in series as an example, the multiple heat storage units 100 are connected in the head-to-tail gas path in sequence. The first end of the heat storage unit 100 at the head end is connected to the air outlet of the air compressor unit 710, and the second end of the heat storage unit 100 at the tail end is connected to the first end of the cold storage unit 200 through the second gas transmission pipe 810. At this time, the high-temperature and high-pressure air discharged from the air compressor unit 710 passes through the multiple heat storage units 100 in sequence and then enters the cold storage unit 200.

[0090] It is understandable that one or more heat storage units 100 may be connected in series or in parallel to store heat according to actual needs. Of course, one or more cold storage units 200 may also be connected in series or in parallel to store cold according to actual needs.

[0091] It should be noted that a plurality means at least two.

[0092] Furthermore, the heat storage unit 100 has a heat storage chamber 110, which is filled with a solid-phase heat storage medium; the cold storage unit 200 has a cold storage chamber, which is filled with a solid-phase cold storage medium; the heat storage chamber 110 is connected to the cold storage chamber gas path. Specifically, in the energy storage stage, high-temperature and high-pressure compressed air enters the heat storage chamber 110, stores the compression heat in the solid-phase heat storage medium, and the cooled high-pressure air enters the cold storage chamber, where it is further cooled and liquefied by the solid-phase cold storage medium to obtain high-pressure liquid air. In the heat release stage, normal-pressure liquid air enters the cold storage chamber, and the solid-phase cold storage medium vaporizes and reheats the normal-pressure liquid air. The reheated air enters the heat storage chamber 110, and the solid-phase heat storage medium further heats and vaporizes the reheated air. Finally, the heated air is used for power generation.

[0093] In this embodiment, heat storage and cold storage are performed in the form of direct heat exchange between air and heat storage and cold storage medium. Compared with the form of indirect heat exchange using circulating air, the system efficiency is higher; compared with the form of indirect heat exchange using chemical media such as thermal oil, methanol, propane, etc., no flammable and explosive chemicals are used, and the system is more environmentally friendly and safer.

[0094] Exemplarily, the solid phase heat storage medium includes high temperature and high pressure resistant solid phase heat storage materials such as concrete, rock or gravel.

[0095] Exemplarily, the solid phase heat storage medium includes high temperature resistant and low pressure resistant solid phase cold storage materials such as rock, glass ball, concrete, gravel, steel or magnetite.

[0096] Furthermore, the liquid air energy storage system further includes a heat preservation layer; the heat preservation layer is wrapped around the outside of the thermal storage unit 100 and / or the cold storage unit 200. By providing the heat preservation layer on the outside of the thermal storage unit 100 and / or the cold storage unit 200, the heat storage and cold storage effects can be further improved.

[0097] Specifically, the outer side of the heat storage unit 100 is wrapped with heat insulation wool, thermal insulation wool, aluminum silicate wool, rock wool, asbestos or glass wool, etc., which are heat preservation materials suitable for being buried underground, to improve the heat storage effect.

[0098] Specifically, the outer side of the cold storage unit 200 is wrapped with deep cold insulation materials suitable for being buried underground, such as diene deep cold insulation cotton, to improve the cold storage effect.

[0099] In other words, the insulation layer includes thermal insulation wool, thermal insulation wool, aluminum silicate wool, rock wool, asbestos or glass wool. The insulation layer may also include diene cryogenic insulation wool.

[0100] Specifically, the material of the heat storage unit 100 and the cold storage unit 200 is stainless steel, and an anti-corrosion layer is provided on the outer wall surface of the heat storage unit 100 and the outer wall surface of the cold storage unit 200. By providing the anti-corrosion layer, the equipment can be anti-corroded to ensure the service life of the equipment.

[0101] Exemplarily, the anti-corrosion layer includes polyethylene anti-corrosion tape and / or epoxy resin coating. In other words, the outer wall surface of the thermal storage unit 100 is anti-corrosion by a polyethylene anti-corrosion tape or an epoxy resin coating, thereby ensuring the life of the equipment. The outer wall surface of the cold storage unit 200 is anti-corrosion by a polyethylene anti-corrosion tape or an epoxy resin coating, thereby ensuring the life of the equipment.

[0102] Furthermore, the operating temperature of the thermal storage unit 100 is -196°C to 20°C, and the operating pressure is 1.5MPa to 10MPa; the operating temperature of the cold storage unit 200 is 20°C to 400°C, and the operating pressure is 1.5MPa to 15MPa.

[0103] In this embodiment, by limiting the operating temperature and operating pressure of the heat storage unit 100 and the cold storage unit 200, the heat storage unit 100 and the cold storage unit 200 are operated in a high-pressure environment, and then combined with the solid-phase heat storage medium and the solid-phase cold storage medium, high-pressure solid-phase heat storage and cold storage are realized. Compared with normal-pressure solid-phase heat storage and cold storage and low-pressure solid-phase heat storage and cold storage, it helps to weaken the influence of the thermocline layer and improve the system's electric-to-electric conversion efficiency.

[0104] like Figures 5 to 8As shown, further, in some embodiments, the heat storage chamber 110 includes a first straight segment 111, a second straight segment 112 and an arc segment 113; the first end of the first straight segment 111 is connected to the air path of the air compressor unit 710. The second straight segment 112 is arranged on one side of the first straight segment 111, and the first end of the second straight segment 112 is connected to the air path of the cold storage chamber. The two ends of the arc segment 113 are connected to the second end of the first straight segment 111 and the second end of the second straight segment 112 respectively. Such a design can form a heat storage chamber 110 similar to a U-shaped structure. The U-shaped structure can better adapt to the uneven settlement of the stratum and the compression of the soil, reduce the risk of pipeline damage, and thus improve the reliability and safety of the system; the "U"-shaped structure can ensure the uniformity of the airflow and the stable gas-solid heat transfer, which is more in line with the law of heat conduction and can improve the heat exchange efficiency of the system.

[0105] Specifically, the inner wall of the heat storage chamber 110 needs to withstand high pressure, so the first straight segment 111 and the second straight segment 112 are cylindrical, and the arc segment 113 transitions to the first straight segment 111 and the second straight segment 112. In other words, the cross-sections of the first straight segment 111 and the second straight segment 112 of the heat storage chamber 110 on the horizontal plane are both circular; the cross-section of the heat storage chamber 110 as a whole in the vertical direction is U-shaped.

[0106] Furthermore, the cold storage chamber and the heat storage chamber 110 have the same shape.

[0107] In some embodiments, the thermal storage unit 100 includes an inner shell 120 and an outer shell 130. The inner shell 120 has a thermal storage chamber 110. The outer shell 130 is formed on the outer side of the inner shell 120, and a filling gap 140 is formed between the inner shell 120 and the outer shell 130; the filling gap 140 is used to accommodate a heat preservation / cold preservation medium. By arranging the outer shell 130 on the outer side of the inner shell 120, and forming a filling gap 140 between the inner shell 120 and the outer shell 130, the filling gap 140 is used to accommodate a heat preservation / cold preservation medium, and the heat storage effect of the thermal storage unit 100 can be improved.

[0108] Furthermore, the structure of the cold storage unit 200 may be the same as that of the thermal storage unit 100, which will not be described in detail. In other words, the cold storage chamber of the cold storage unit 200 is a U-shaped structure, and a filling gap 140 is also provided between the outer shell 130 and the inner shell 120 of the cold storage unit 200.

[0109] Exemplarily, the heat preservation / cold preservation medium includes a heat preservation medium and a cold preservation medium; the heat preservation medium is used to fill the filling gap 140 of the thermal storage unit 100; the cold preservation medium is used to fill the filling gap 140 of the cold storage unit 200. The heat preservation medium includes foamed cement, expanded perlite, foamed glass, vitrified microspheres, foamed ceramics, ceramic fibers or aerogel pearl sand. In other words, the filling gap 140 of the thermal storage unit 100 can be filled with foamed cement, expanded perlite, foamed glass, vitrified microspheres, foamed ceramics, ceramic fibers or aerogel pearl sand. The cold preservation medium includes rigid polyurethane foam or deep cold series rubber and plastic materials. In other words, the filling gap 140 of the cold storage unit 200 is filled with cold preservation media such as rigid polyurethane foam or deep cold series rubber and plastic materials.

[0110] Furthermore, the housing 130 has a recessed portion 131, and the recessed portion 131 is located between the first straight segment 111 and the second straight segment 112. In other words, the cross section of the thermal storage unit 100 in the vertical direction is U-shaped. The thermal storage unit 100 with a U-shaped structure can better adapt to the uneven settlement of the strata and the compression of the soil, reduce the risk of pipeline damage, and thus improve the reliability and safety of the system; the U-shaped structure can ensure the uniformity of the airflow and the stable gas-solid heat transfer, which is more in line with the law of heat conduction and can improve the heat exchange efficiency of the system.

[0111] For example, the outer side of the housing 130 can be designed as follows according to actual needs. Figure 4 The circle shown can also be designed as Figure 7 The square shown.

[0112] Specifically, the outer shell 130 and the inner shell 120 are both made of stainless steel, and the outer side of the outer shell 130 is anti-corrosive by means of polyethylene anti-corrosion tape, epoxy resin coating spraying, etc., to ensure the life of the equipment.

[0113] like Figures 1 to 4 As shown, in some embodiments, the cold storage unit 200 preferably uses solid-phase cold storage. The cold storage unit 200 has a cold storage chamber; the cold storage chamber is filled with a solid-phase cold storage medium. The cooled air discharged from the cold storage unit 200 enters the cold storage chamber and directly exchanges heat with the solid-phase cold storage medium. The solid-phase cold storage medium liquefies the air to form high-pressure liquid air. In this embodiment, the cold storage is performed in the form of direct heat exchange between air and solid-phase cold storage medium. Compared with the form of indirect heat exchange using circulating air, the system efficiency is higher.

[0114] Specifically, the solid phase heat storage medium includes high temperature resistant and low pressure resistant solid phase cold storage materials such as rock, glass ball, concrete, gravel, steel or magnetite.

[0115] like Figures 2 to 4As shown, in some embodiments, the liquid air energy storage subsystem includes an energy storage component 700; the energy storage component 700 includes an air compressor group 710, a first gas pipeline 720 and a first valve body 730; the gas outlet of the air compressor group 710 is connected to the first end gas path of the thermal storage unit 100 through the first gas pipeline 720; the first valve body 730 is arranged on the first gas pipeline 720, and is used to control the gas path of the first gas pipeline 720. In the energy storage stage, low-valley electricity such as wind power and photovoltaic power is used as electricity to power the air compressor group 710, and the purified air is compressed to a high temperature and high pressure state through the air compressor group 710. The compressed high-temperature compressed air enters the thermal storage chamber 110 of the thermal storage unit 100 through the first gas pipeline 720, and directly exchanges heat with the solid phase thermal storage medium in the thermal storage chamber 110, and stores the compression heat in the solid phase thermal storage medium.

[0116] In some embodiments, the liquid air energy storage system further includes a depressurization component 400 and a liquid air storage tank 500. The liquid inlet of the depressurization component 400 is connected to the liquid outlet of the cold storage unit 200. The liquid air storage tank 500 is connected to the liquid outlet of the depressurization component 400, and is used to store liquid air at normal pressure. Specifically, in the energy storage stage, the air compressor unit 710 is used to compress air at normal temperature and pressure into high-temperature and high-pressure air. The high-temperature and high-pressure air enters the heat storage chamber 110 of the heat storage unit 100 through the first air transmission pipe 720 to directly exchange heat with the solid-phase heat storage medium, and the compression heat is stored in the solid-phase heat storage medium. The high-pressure air after cooling enters the cold storage chamber of the cold storage unit 200, and is directly further cooled and liquefied by the solid-phase cold storage medium to obtain high-pressure liquid air; the high-temperature liquid air enters the depressurization component 400, and is stored in the liquid air storage tank 500 after being depressurized by the depressurization component 400. During the energy release stage, the normal-pressure liquid air stored in the liquid air storage tank 500 enters the cold storage chamber of the cold storage unit 200, and is directly vaporized and reheated by the solid-phase cold storage medium. The reheated air enters the heat storage chamber 110 of the heat storage unit 100, and is directly further heated and vaporized by the solid-phase heat storage medium. Finally, the heated air is used for power generation.

[0117] In this embodiment, the pressure reduction component 400 can be used to reduce the pressure of high-pressure liquid air, and the normal-pressure liquid air can be stored in the liquid air storage tank 500, thereby reducing the investment cost of the liquid air storage tank 500 and improving storage safety.

[0118] Furthermore, the pressure reduction assembly 400 includes a liquid expansion machine 410 and a throttle valve 420. The liquid inlet of the liquid expansion machine 410 is connected to the liquid outlet of the cold storage unit 200; the liquid outlet of the liquid expansion machine 410 is connected to the liquid inlet of the throttle valve 420, and the liquid outlet of the throttle valve 420 is connected to the liquid air storage tank 500. By providing the liquid expansion machine 410 and the throttle valve 420, the high-pressure liquid air is decompressed, so that the liquid air is stored in the liquid air storage tank 500 in the form of normal pressure.

[0119] Furthermore, a fourth valve body 920 is provided between the liquid inlet of the liquid expander 410 and the liquid outlet of the cold storage unit 200, and the fourth valve body 920 is used to control the opening and closing of the liquid outlet of the cold storage unit 200. In the energy storage and release gap stage, the fourth valve body 920 is closed.

[0120] Furthermore, a second valve body 910 is provided between the first end of the thermal storage unit 100 and the gas outlet end of the first valve body 730, and the second valve body 910 is used to control the opening and closing of the first end of the thermal storage unit 100. In the energy storage and release gap stage, the second valve body 910 is closed.

[0121] like Figures 1 to 4 As shown, in some embodiments, the liquid air energy storage subsystem further includes a reverse flow component; the air inlet end of the gas reverse flow component is used to communicate with the air outlet gas path of the liquid air storage tank 500, and the air outlet end of the gas reverse flow component is used to communicate with the air inlet end gas path of the air compressor unit 710. By providing the gas reverse flow component, the air in the liquid air storage tank 500 that has not been liquefied can be returned to the air compressor unit 710 to be recompressed and liquefied, thereby avoiding heat waste and improving system efficiency.

[0122] Specifically, the gas reflux assembly includes a gas reflux pipe 310, a coil 320, a return pipe 330 and a fifth valve body 340. The air inlet end of the gas reflux pipe 310 is used to communicate with the gas outlet of the liquid air storage tank 500. The coil 320 is arranged in the cold storage chamber; the air inlet end of the coil 320 is in gaseous communication with the gas outlet end of the gas reflux pipe 310. The air inlet end of the return pipe 330 is in gaseous communication with the gas outlet end of the coil 320, and the gas outlet end of the return pipe 330 is used to communicate with the air inlet end of the air compressor unit 710. The fifth valve body 340 is arranged on the return pipe 330. Specifically, the fifth valve body 340 is opened, and the backflow air in the liquid air storage tank 500 enters the coil 320 in the cold storage chamber through the gas backflow pipe 310, and the cold energy of the backflow air is recovered by the solid phase cold storage medium. The backflow air after recovering the cold energy enters the air intake end of the air compressor unit 710 again, thereby avoiding heat waste and improving system efficiency.

[0123] like Figures 2 to 4As shown, in some embodiments, the liquid air energy storage subsystem further includes an energy release component 600; the energy release component 600 includes a cryogenic pump 610, an energy release gas pipe 620 and a sixth valve body 640; the liquid inlet of the cryogenic pump 610 is connected to the liquid outlet of the liquid air storage tank 500, and the liquid outlet of the cryogenic pump 610 is connected to the cold storage unit 200; the gas inlet end of the energy release gas pipe 620 is connected to the gas path of the heat storage unit 100. The sixth valve body 640 is disposed on the energy release gas pipe 620. In the energy release stage, the sixth valve body 640 is opened, and the cryogenic pump 610 draws the normal-pressure liquid air in the liquid air storage tank 500 to the cold storage chamber of the cold storage unit 200, and the solid-phase cold storage medium directly reheats and vaporizes the normal-pressure liquid air; the reheated air enters the heat storage chamber 110 of the heat storage unit 100, and the solid-phase heat storage medium directly heats the air to vaporize the liquid air; the gaseous air is discharged through the energy release gas transmission pipe 620 and can be used for power generation.

[0124] Furthermore, the energy release component 600 also includes a turbine unit 630; the outlet end of the energy release air pipe 620 is connected to the turbine unit 630, and the heated gaseous air enters the turbine unit 630 to drive the generator to generate electricity.

[0125] like Figures 1 to 4 As shown, in some embodiments, the liquid air energy storage coupling system includes a second air intake pipe 2 and / or a third air intake pipe 3. The two ends of the second air intake pipe 2 are respectively connected to the air outlet of the air compressor unit 710 and the gasification agent inlet of the biomass gasifier 50, and a second switch valve 5 is installed on the second air intake pipe 2. The two ends of the third air intake pipe 3 are respectively connected to the cold storage unit 200 and the gasification agent inlet of the biomass gasifier 50, and are used to transport the reheated air discharged from the cold storage unit 200 to the biomass gasifier 50; the third air intake pipe 3 is installed with a third switch valve 6.

[0126] In this embodiment, by providing the second air inlet pipe 2, the clean air at the air outlet of the air compressor unit 710 can be introduced into the gasifying agent inlet of the biomass gasifier 50 to provide the gasifying agent for the biomass gasifier 50. By providing the third air inlet pipe 3, the reheated air discharged from the cold storage unit 200 can be introduced into the gasifying agent inlet of the biomass gasifier 50 to provide the gasifying agent for the biomass gasifier 50, which can further improve the resource utilization rate of the liquid air energy storage subsystem.

[0127] Further, the air outlet of the turbine unit 630 is connected to the gasifying agent inlet of the biomass gasifier 50 through the first air inlet pipe 1, and the first air inlet pipe 1 is installed with a first switch valve 4. The air outlet of the air compressor unit 710 and the gasifying agent inlet of the biomass gasifier 50 are connected through the second air inlet pipe 2, and the second air inlet pipe 2 is installed with a second switch valve 5. The cold storage unit 200 and the gasifying agent inlet of the biomass gasifier 50 are connected through the third air inlet pipe 3, and the third switch valve 6 is installed on the third air inlet pipe 3. In the energy storage stage, the second switch valve 5 is opened to provide air to the gasifier with a section of compressed air. In the intermittent stage of energy storage and release, the third switch valve 6 is opened to provide air to the gasifier with the reheated air discharged from the cold storage unit 200. In the energy release stage, the first switch valve 4 is opened to provide air to the gasifier with the air at the air outlet of the turbine unit 630. In this embodiment, the valve is switched to provide a continuous and stable gasifying agent to the gasifier, thereby maintaining a continuous and stable biomass gasification reaction.

[0128] In some embodiments, the liquid air energy storage coupling system further includes a heat storage component 90. The syngas inlet of the heat storage component 90 is connected to the syngas outlet of the biomass gasifier 50, and the syngas outlet of the heat storage component 90 is used to discharge the cooled syngas; the heat storage component 90 is connected to the heat storage unit 100 to form a heat exchange medium circulation loop; the syngas entering the heat storage component 90 is used to heat the heat exchange medium to increase the temperature of the heat exchange medium.

[0129] In this embodiment, the heat storage component 90 is provided, and the heat storage component 90 can realize the heat exchange between the synthesis gas and the heat exchange medium, so that the temperature of the synthesis gas is reduced and the temperature of the heat exchange medium is increased. At the same time, the heat storage component 90 forms a heat exchange medium circulation loop with the heat storage unit 100, so that the heat of the synthesis gas can be utilized, which can not only improve the power generation efficiency of the liquid air energy storage subsystem, but also realize the recovery and utilization of the heat of biomass gasification, and improve the energy utilization rate of the biomass gasification subsystem.

[0130] It should be noted that the heat exchange medium can be gas or liquid. Preferably, the heat exchange medium is air.

[0131] Furthermore, the heat storage assembly 90 includes a heat storage device 91; the heat storage device 91 has a receiving cavity, a first heat exchange tube and a second heat exchange tube; the receiving cavity is filled with a solid heat storage medium; the first heat exchange tube and the second heat exchange tube are buried in the solid heat storage medium, the first heat exchange tube is used to transport the synthesis gas, and the second heat exchange tube is used to transport the heat exchange medium. Using a solid heat storage medium to store the heat of the synthesis gas can improve the heat exchange efficiency and is safe and reliable.

[0132] Specifically, the solid phase heat storage medium includes at least one of concrete, rock, gravel, steel, and magnetite.

[0133] Combine the following Figures 1 to 3 The biomass gasification subsystem of the present invention is described in detail.

[0134] like Figures 1 to 3 As shown, in some embodiments, the biomass gasifier 50 is a fluidized bed gasifier. The fluidized bed gasifier includes a bubbling fluidized bed gasifier, a circulating fluidized bed gasifier or a double fluidized bed gasifier. The use of a fluidized bed gasifier can effectively avoid the problems of bed blockage and scaling caused by the use of a fixed bed gasifier. In addition, the gasifier of the fluidized bed gasifier is injected into the bed to form a large number of gas microbubbles, so that the material is suspended in the air flow, which has the advantages of stable operation, low pollutant emissions, short reaction time, and high reaction efficiency. However, the fluidized bed gasifier requires a large amount of gas to form a fluidized bed. The integrated system described in the present invention can effectively solve the problem of the large amount of gas required by the fluidized bed gasifier by coupling with the liquid air energy storage subsystem.

[0135] Specifically, the operating temperature of the biomass gasifier 50 is 700-1000°C, the operating pressure is 0.11-0.15MPa, and the temperature of the syngas discharged from the syngas outlet of the biomass gasifier 50 is 100-300°C lower than the gasification temperature. According to the actual situation of the project construction site, low-peak electric heating, solar thermal energy, high-temperature industrial waste heat from smelters and other heat sources are flexibly selected to heat the biomass gasifier 50.

[0136] Furthermore, the biomass gasification subsystem includes a raw material supply component 70 and a syngas purification component 80; the raw material supply component 70 is used to supply biomass raw materials to the biomass gasifier 50, and one end of the syngas purification component 80 is connected to the syngas outlet of the biomass gasifier, and the other end is connected to the syngas inlet of the regenerator 91. By providing the syngas purification component 80, it can be ensured that clean syngas is input into the regenerator 91.

[0137] Specifically, the syngas purification assembly 80 includes a cyclone separator 81 and a tar reformer 82. The cyclone separator 81 and the tar reformer 82 are arranged on the pipeline between the syngas outlet of the biomass gasifier and the syngas inlet of the regenerator 91, and the cyclone separator 81 is located upstream of the tar reformer 82. The biomass raw material reacts with the gasifying agent at high temperature in the biomass gasifier 50. After the biomass is gasified, the high-temperature synthesis gas produced by the gasifier is discharged through the cyclone separator 81. The inlet temperature of the cyclone separator 81 is about 700-900°C. The high-temperature synthesis gas after ash discharge enters the tar reformer 82 for further purification. The temperature of the tar reformer 82 is controlled at the optimal reaction temperature of tar reforming, 600-800°C. The purified synthesis gas is cooled by the heat accumulator 91 and the heat is recovered. The cooled purified synthesis gas can be stored in the synthesis gas storage tank 60 for standby; it can also directly enter the power generation subsystem 7 and / or the chemical substance production subsystem 8, thereby improving the utilization rate of the synthesis gas from the biomass gasification reaction.

[0138] Furthermore, the raw material supply component 70 includes a biomass storage bin 71, a cutting and forming machine 72, a hopper 73, a belt conveyor 74, a crushing bin 75 and a locking hopper 76; the biomass raw material is stored in the biomass storage bin 71, and the raw material enters the receiving hopper 73 after being crushed by the cutting and forming machine 72, and is then transported to the crushing bin 75 via the belt conveyor, and the crushed material is added to the biomass gasification furnace 50 through the locking hopper 76.

[0139] Furthermore, the biomass gasification subsystem further includes a syngas storage tank 60 ; the syngas storage tank 60 is connected to the syngas outlet of the heat storage component 90 , and is used to store the cooled syngas. Specifically, the syngas storage tank 60 is connected to the syngas outlet of the heat storage device 91 .

[0140] Furthermore, the liquid air energy storage coupling system also includes a power generation subsystem 7 and / or a chemical substance production subsystem 8; the power generation subsystem 7 is connected to the synthesis gas storage tank 60. The chemical substance production subsystem 8 is connected to the synthesis gas storage tank 60. Specifically, the power generation subsystem 7 includes a steam power generation subsystem 7, a gas power generation subsystem 7 and / or an internal combustion engine power generation subsystem 7. In this embodiment, the synthesis gas produced by biomass gasification is used for power generation, which can significantly improve the energy storage scale and capacity of the energy storage system. According to the electricity demand and the demand for energy storage scale, the remaining biomass synthesis gas can also be used for the production of chemicals such as synthetic methanol and ethanol.

[0141] Specifically, the chemical substances produced by the chemical substance production subsystem 8 include methanol or ethanol.

[0142] In summary, the liquid-air energy storage coupling system of the present invention has the following advantages:

[0143] (1) Integrate biomass gasification power generation or biomass gasification chemical preparation with the liquid air energy storage subsystem to realize the resource utilization of a large amount of clean air in the liquid air energy storage subsystem and the heat recovery of the high-temperature syngas from biomass gasification, thereby improving the round-trip efficiency of the liquid air energy storage system and the comprehensive energy utilization efficiency of the entire integrated system.

[0144] (2) The coupling of biomass gasification power generation and liquid air energy storage can significantly improve the energy storage scale and capacity of the energy storage system; at the same time, according to the electricity demand and the demand for energy storage scale, the remaining biomass synthesis gas can also be used to synthesize chemicals such as methanol, which can flexibly control the energy storage scale and enhance the comprehensive energy utilization rate.

[0145] (3) The biomass gasification furnace adopts a fluidized bed gasification furnace, which can effectively avoid the problems of bed clogging and scaling caused by the use of a fixed bed gasification furnace. It has the advantages of stable operation, low pollutant emissions, short reaction time, and high reaction efficiency. At the same time, by coupling with a liquid air energy storage subsystem, it can effectively solve the problem of large gas consumption required by the fluidized bed gasification furnace.

[0146] (4) The heat of high-temperature biomass synthesis gas is recovered by solid-phase heat storage medium and reused by circulating air. Compared with the use of liquid-phase heat storage medium, it has the advantages of environmental protection, safety, and economy.

[0147] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these 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 invention.

Claims

1. A liquid air energy storage coupling system, characterized in that: Including liquid air energy storage subsystem and biomass gasification subsystem; The liquid air energy storage subsystem comprises: Air compressor unit (710); A heat storage unit (100), wherein an air inlet of the heat storage unit (100) is in communication with an air outlet of the air compressor unit (710); A cold storage unit (200), the cold storage unit (200) being in communication with the heat storage unit (100); a turbine unit (630), wherein the air outlet of the heat storage unit (100) is in communication with the air inlet of the turbine unit (630) and is used to deliver high-temperature air to the turbine unit (630); the high-temperature air enters the turbine unit (630) to drive the generator to generate electricity and cool down the air; and the air outlet of the turbine unit (630) is used to discharge the cooled air; The biomass gasification subsystem comprises: A biomass gasifier (50), wherein a gasifying agent inlet of the biomass gasifier (50) is connected to an air outlet of the turbine unit (630).

2. The liquid air energy storage coupling system according to claim 1, characterized in that: Also includes: a second air intake pipe (2), the two ends of the second air intake pipe (2) being respectively connected to the air outlet of the air compressor unit (710) and the gasifying agent inlet of the biomass gasifier (50), and a second switch valve (5) being installed on the second air intake pipe (2); or / and; A third air intake pipe (3), the two ends of which are respectively connected to the cold storage unit (200) and the gasifying agent inlet of the biomass gasifier (50), and are used to transport the reheated air discharged from the cold storage unit (200) to the biomass gasifier (50); a third switch valve (6) is installed on the third air intake pipe (3).

3. The liquid air energy storage coupling system according to claim 1, characterized in that: Also includes: A heat storage component (90), wherein a synthesis gas inlet of the heat storage component (90) is connected to a synthesis gas outlet of the biomass gasifier (50), and the synthesis gas outlet of the heat storage component (90) is used to discharge the synthesis gas after the temperature is reduced; the heat storage component (90) is connected to the heat storage unit (100) to form a heat exchange medium circulation loop; the synthesis gas entering the heat storage component (90) is used to heat the heat exchange medium, so that the temperature of the heat exchange medium is increased.

4. The liquid air energy storage coupling system according to claim 3, characterized in that: The heat storage unit (100) comprises: a first cooler (10), wherein an air inlet of the first cooler (10) is in communication with an air outlet of the air compressor unit (710), and an air outlet of the first cooler (10) is in communication with an air inlet of the cold storage unit (200); A high-temperature medium storage tank (20), wherein a heat storage medium inlet of the high-temperature medium storage tank (20) is connected to a heat storage medium outlet of the first cooler (10); A low-temperature medium storage tank (30), wherein a heat storage medium outlet of the low-temperature medium storage tank (30) is in communication with a heat storage medium inlet of the first cooler (10); A heat exchanger (40), wherein a heat storage medium inlet of the heat exchanger (40) is communicated with a heat storage medium outlet of the high-temperature medium storage tank (20), the heat storage medium outlet of the heat exchanger (40) is communicated with a heat storage medium inlet of the low-temperature medium storage tank (30), the air inlet of the heat exchanger (40) is communicated with an air outlet of the cold storage unit (200), and the air outlet of the heat exchanger (40) is communicated with an air inlet of the turbine unit (630); the heat exchange medium inlet of the heat exchanger (40) is communicated with a heat exchange medium outlet of the heat storage component (90), and the heat exchange medium outlet of the heat exchanger (40) is communicated with a heat exchange medium inlet of the heat storage component (90), so as to form a heat exchange medium circulation loop.

5. The liquid air energy storage coupling system according to claim 3, characterized in that: The biomass gasification subsystem also includes: A synthesis gas storage tank (60), the synthesis gas storage tank (60) being in communication with the synthesis gas outlet of the heat storage component (90) and being used for storing the synthesis gas after cooling.

6. The liquid air energy storage coupling system according to claim 5, characterized in that: Also includes: A power generation subsystem (7), the power generation subsystem (7) being in communication with the synthesis gas storage tank (60); or / and; A chemical substance production subsystem (8), wherein the chemical substance production subsystem (8) is in communication with the synthesis gas storage tank (60).

7. The liquid air energy storage coupling system according to claim 3, characterized in that: The heat storage assembly (90) comprises a heat accumulator (91); the heat accumulator (91) has a containing cavity, a first heat exchange tube and a second heat exchange tube; the containing cavity is filled with a solid-phase heat storage medium; the first heat exchange tube and the second heat exchange tube are buried in the solid-phase heat storage medium, the first heat exchange tube is used to transport synthesis gas, and the second heat exchange tube is used to transport heat exchange medium.

8. The liquid air energy storage coupling system according to claim 1, characterized in that: The heat storage unit (100) comprises a heat storage chamber (110), wherein the heat storage chamber (110) is filled with a solid-phase heat storage medium, and the cold storage unit (200) comprises a cold storage chamber, wherein the cold storage chamber is filled with a solid-phase cold storage medium.

9. The liquid air energy storage coupling system according to claim 8, characterized in that: The heat storage unit (100) and the cold storage unit (200) are both buried underground.

10. The liquid air energy storage coupling system according to any one of claims 1 to 9, characterized in that: The biomass gasifier (50) is a fluidized bed gasifier.

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