Liquid air energy storage subsystem and coupling system

Abstract

The invention relates to the technical field of liquid air energy storage, and discloses a liquid air energy storage subsystem and a coupling system. The liquid air energy storage subsystem comprises a heat storage unit and a cold storage unit; the heat storage unit and the cold storage unit are buried underground; the cold storage unit communicates with the heat storage unit through a gas circuit. In the energy storage stage, the heat storage unit is used for storing compression heat, and the cold storage unit is used for precooling compressed air discharged from the heat storage unit so that the compressed air can be liquefied. And in the energy release stage, the cold storage unit is used for rewarming the liquid air, and the heat storage unit is used for reheating the air discharged from the cold storage unit, so that the liquid air is gasified. The heat storage unit and the cold storage unit are buried underground, so that the occupied area is effectively reduced, the construction cost is greatly reduced compared with that of overground high-pressure heat storage and cold storage, potential safety hazards caused by overground high-pressure equipment are avoided, and the problem that potential safety hazards exist in the heat storage and cold storage unit in the current liquid air energy storage technology is solved; and the occupied area is large.

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 subsystem and a coupling system. Background Art

[0002] Liquid air energy storage technology is clean, low-carbon, safe, long-life, and can provide rotational inertia support. It is one of the most competitive long-term energy storage technologies that can couple with renewable energy power generation and support new power systems. In the energy storage stage, the air enters the cold storage unit after being compressed, purified, and cooled. The liquid air obtained after cooling and liquefaction is stored in the liquid air storage tank, and the compression heat is stored in the heat storage unit. In the energy release stage, the liquid air first passes through the cold storage unit for gasification and reheating, and the cold is recovered. The reheated air enters the heat storage unit for heat storage and is heated by the recovered compression heat. The heated air enters the expansion unit to drive the generator to generate electricity. In this technology, the heat storage and cold storage unit is a key link in ensuring the efficiency of the liquid air energy storage subsystem.

[0003] In the current liquid air energy storage technology, in the heat storage unit, the heat accumulator usually uses chemicals such as thermal oil or molten salt as the heat storage medium to store heat, which poses the risk of heat storage medium leakage and safety hazards. In the cold storage unit, it is mainly divided into liquid phase cold storage technology and solid phase cold storage technology. Among them, solid phase cold storage technology uses rocks, gravel, glass balls, etc. as cold storage media. Compared with liquid phase cold storage technology that uses flammable and explosive media such as methanol and propane, it is safer and is one of the important directions for the large-scale development of large-scale liquid air energy storage technology in the future. However, due to the fact that the traditional normal pressure solid phase cold storage system produces a temperature slope layer during the interval between energy storage and release, the system efficiency is reduced, resulting in the liquid air energy storage technology based on the traditional solid phase cold storage method cannot be commercialized on a large scale.

[0004] In recent years, in order to solve the problem of low efficiency of liquid air energy storage subsystems based on traditional solid-phase cold storage technology, researchers have proposed liquid air energy storage technology including fluidized solid-phase cold storage, liquid air energy storage technology using combined solid-phase cold storage devices, and liquid air energy storage technology based on high-pressure solid-phase cold storage. Among them, the solid-phase cold storage method based on fluidization technology has problems such as fluidization wear of solid-phase cold storage medium and difficulty in automatic transportation and transportation control of solid-phase cold storage medium, which seriously restricts its large-scale application. Liquid air energy storage technology using combined solid-phase cold storage devices occupies a large area. When using high-pressure solid-phase cold storage devices to weaken the influence of the thermocline layer, safety hazards are introduced, which weakens the outstanding advantage of solid-phase cold storage in terms of high safety compared to liquid-phase cold storage. Therefore, the current liquid air energy storage technology has safety hazards in heat storage and cold storage units, and occupies a large area. Summary of the invention

[0005] The present invention provides a liquid air energy storage subsystem and a coupling system, which are used to solve the potential safety hazards of heat storage and cold storage units in the liquid air energy storage technology in the prior art and the problem of large floor space occupied by the combined solid-phase heat storage and cold storage devices.

[0006] The present invention provides a liquid air energy storage subsystem, comprising: The heat storage unit is buried underground; A cold storage unit is buried underground; the cold storage unit is connected to the heat storage unit by gas path; In the energy storage stage, the heat storage unit is used to store compression heat, and the cold storage unit is used to precool the compressed air discharged from the heat storage unit to liquefy the compressed air; In the energy release stage, the cold storage unit is used to reheat the liquid air, and the heat storage unit is used to reheat the air exhausted from the cold storage unit to vaporize the liquid air.

[0007] According to the liquid air energy storage subsystem provided by the present invention, the heat storage unit has a heat storage cavity, which is filled with a solid-phase heat storage medium; the cold storage unit has a cold storage cavity, which is filled with a solid-phase cold storage medium; the heat storage cavity is connected to the cold storage cavity by an air path.

[0008] According to the liquid air energy storage subsystem provided by the present invention, the heat storage chamber comprises a first straight line segment, wherein a first end of the first straight line segment is in communication with an air path of the air compressor unit; A second straight line segment is disposed on one side of the first straight line segment, and a first end of the second straight line segment is connected to the cold storage chamber gas path; An arc segment, two ends of which are respectively connected to the second end of the first straight segment and the second end of the second straight segment by air paths.

[0009] According to the liquid air energy storage subsystem provided by the present invention, the heat storage unit comprises: An inner shell, wherein the inner shell has the heat storage chamber; An outer shell is formed on the outer side of the inner shell and forms a filling gap between the outer shell and the inner shell; the filling gap is used to accommodate a heat preservation / cold preservation medium.

[0010] According to the liquid air energy storage subsystem provided by the present invention, the shell has a recessed portion, and the recessed portion is located between the first straight line segment and the second straight line segment.

[0011] According to the liquid air energy storage subsystem provided by the present invention, the operating temperature of the heat storage unit is -196°C~20°C, and the operating pressure is 1.5MPa~10MPa; the operating temperature of the cold storage unit is 20°C~400°C, and the operating pressure is 1.5MPa~15MPa.

[0012] The liquid air energy storage subsystem provided by the present invention further includes: A gas reflux component, wherein the air inlet end of the gas reflux component is used to communicate with the air outlet gas path of the liquid air storage tank, and the air outlet end of the gas reflux component is used to communicate with the air inlet end gas path of the air compressor unit.

[0013] According to the liquid air energy storage subsystem provided by the present invention, the gas reverse flow component comprises: A gas reflux pipe, the gas inlet end of the gas reflux pipe is used to communicate with the gas outlet gas path of the liquid air storage tank; A coil is arranged in the cold storage chamber; the air inlet end of the coil is in gas communication with the air outlet end of the gas reflux pipe; A return pipe, the air inlet end of the return pipe is connected to the air outlet end of the coil, and the air outlet end of the return pipe is used to communicate with the air inlet end of the air compressor unit; The fifth valve body is arranged on the reflux pipe.

[0014] The liquid air energy storage subsystem provided by the present invention further includes: A pressure reducing component, wherein the liquid inlet of the pressure reducing component is connected to the liquid outlet of the cold storage unit; The liquid air storage tank is connected to the liquid outlet of the pressure reducing assembly and is used to store liquid air at normal pressure.

[0015] A second aspect of the present invention provides a liquid air energy storage coupling system, comprising: The liquid air energy storage subsystem described in any one of the above items, wherein the liquid air energy storage subsystem further comprises a turbine unit, wherein the air outlet of the heat storage unit is connected to the air inlet of the turbine unit for conveying high-temperature air to the turbine unit, wherein the high-temperature air enters the turbine unit to drive the generator to generate electricity and cool down, and the air outlet of the turbine unit is used to discharge the cooled air; The biomass gasification subsystem comprises a biomass gasification furnace; the gasification agent inlet of the biomass gasification furnace is connected to the air outlet of the turbine unit.

[0016] The liquid air energy storage subsystem provided by the present invention not only effectively reduces the occupied area by burying the heat storage unit and the cold storage unit underground, but also greatly reduces the construction cost compared to the above-ground high-pressure heat storage and cold storage, and avoids the safety hazards caused by the above-ground high-pressure equipment, thereby improving the safety of the system and solving the problems of the current liquid air energy storage technology in the heat storage and cold storage units having safety hazards and occupying a large area.

[0017] The liquid air energy storage coupling system of the present invention includes the above-mentioned liquid air energy storage subsystem, and therefore has at least the above-mentioned advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 This is one of the structural schematic diagrams of a liquid air energy storage coupling system provided by the present invention.

[0020] Figure 2 This is the second structural schematic diagram of a liquid air energy storage coupling system provided by the present invention.

[0021] Figure 3 It is a schematic structural diagram of the liquid air energy storage subsystem provided by the present invention.

[0022] Figure 4 It is one of the structural schematic diagrams of the heat storage unit of the liquid air energy storage subsystem provided by the present invention.

[0023] Figure 5 yes Figure 4 A schematic diagram of the cross-sectional structure of a heat storage unit when viewed from above.

[0024] Figure 6 yes Figure 4 Schematic diagram of the cross-sectional structure of the heat storage unit under the main visual perspective.

[0025] Figure 7 This is the second structural schematic diagram of the heat storage unit of the liquid air energy storage subsystem provided by the present invention.

[0026] Figure 8 yes Figure 7 A schematic diagram of the cross-sectional structure of a heat storage unit when viewed from above.

[0027] Fig. 9 yes Figure 7 Schematic diagram of the cross-sectional structure of the heat storage unit under the main visual perspective.

[0028] Reference numerals: 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; 200. Cold storage unit; 310, gas reflux pipe; 320, coil; 330, return pipe; 340, fifth valve body; 400, pressure reduction assembly; 410, liquid expander; 420, throttle valve; 500. Liquid air storage tank; 600, energy release assembly; 610, cryogenic pump; 620, energy release gas transmission pipe; 630, turbine unit; 640, sixth valve body; 700, energy storage assembly; 710, air compressor unit; 720, first air transmission pipe; 730, first valve body; 810, second gas transmission pipe; 820, third valve body; 910, second valve body; 920, fourth valve body; 50. Biomass gasifier; 60. Synthesis gas storage tank; 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; 80. Synthesis gas purification component; 81. Cyclone separator; 82. Tar reformer; 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; 90. heat storage component; 91. heat storage device; 92. blower. DETAILED DESCRIPTION

[0029] 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.

[0030] 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, which 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation 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.

[0031] 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 directly connected or indirectly connected 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.

[0032] 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.

[0033] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" 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 patent of the present invention. In this specification, the schematic representation of the above terms does 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, unless they are contradictory.

[0034] Combine the following Figures 3 to 9 The liquid air energy storage subsystem of the present invention is described in detail.

[0035] like Figure 3 As shown, a specific embodiment of the present invention provides a liquid air energy storage subsystem. 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 gasify 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.

[0036] In this embodiment, by burying the heat storage unit 100 and the cold storage unit 200 underground, not only the occupied area is effectively reduced, the construction cost is greatly reduced compared to the above-ground high-pressure heat storage and cold storage, and the safety hazards caused by the above-ground high-pressure equipment are avoided, the safety of the system is improved, and the current liquid air energy storage technology solves the safety hazards in the heat storage and cold storage unit 200 and the problem of a large occupied area.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] It should be noted that a plurality means at least two.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] Furthermore, the liquid air energy storage subsystem further includes a thermal insulation layer; the thermal insulation layer is wrapped around the outside of the thermal storage unit 100 and / or the cold storage unit 200. By providing the thermal insulation 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] Furthermore, the operating temperature of the thermal storage unit 100 is -196°C~20°C, and the operating pressure is 1.5MPa~10MPa; the operating temperature of the cold storage unit 200 is 20°C~400°C, and the operating pressure is 1.5MPa~15MPa.

[0054] 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.

[0055] like Figure 3 As 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] like Figure 3 As shown, in some embodiments, the liquid-phase air energy storage system further includes a gas reflux component; the gas inlet end of the gas reflux component is used to communicate with the gas outlet of the liquid air storage tank 500, and the gas outlet end of the gas reflux component is used to communicate with the gas inlet end of the air compressor unit 710. By providing the gas reflux 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.

[0062] Furthermore, 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.

[0063] like Figure 3As 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.

[0064] 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.

[0065] like Figures 4 to 9 As shown, 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.

[0066] 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.

[0067] Furthermore, the cold storage chamber and the heat storage chamber 110 have the same shape.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] For example, the outer side of the housing 130 can be designed as follows according to actual needs. Figure 2 The circle shown can also be designed as Figure 5 The square shown.

[0073] 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.

[0074] Below Figure 3 Taking the liquid air energy storage subsystem shown in the figure as an example, its working process is described in detail: In the energy storage stage, the first valve body 730, the second valve body 910, the third valve body 820, the fourth valve body 920, the fifth valve body 340 and the throttle valve 420 are opened; the purified air is compressed to a high temperature and high pressure state through the air compressor unit 710 using off-peak electricity such as wind power and photovoltaic power as power input, and the compressed high-temperature compressed air enters the thermal storage unit 100 placed underground, and the compression heat is stored in the solid phase thermal storage medium in the thermal storage chamber 110, and the compressed air after cooling enters the cold storage unit placed underground. The heat storage chamber 110 of 200 is further cooled and liquefied to obtain high-pressure liquid air; the high-pressure liquid air is decompressed to the local atmospheric pressure through the liquid expander 410 and the throttle valve 420, and then stored in the liquid air storage tank 500. The backflow air in the liquid air storage tank 500 enters the cold storage chamber of the cold storage unit 200 through the gas backflow pipe 310, and the cold energy of the low-temperature air is recovered through the coil 320 in the cold storage chamber. The air after recovering the cold energy passes through the reflux pipe 330 and enters the air compressor unit 710 again.

[0075] During the energy release stage, the first valve body 730 is closed, and the second valve body 910, the third valve body 820, the fourth valve body 920 and the sixth valve body 640 are opened; the normal pressure liquid air in the liquid air storage tank 500 is pumped to the cold storage chamber of the cold storage unit 200 by the low-temperature pump 610, and the liquid air is vaporized and reheated by the solid-phase cold storage medium. The reset air enters the heat storage chamber 110 of the heat storage unit 100 through the second air pipe 810, and is further heated by the solid-phase heat storage medium. The heated air enters the turbine unit 630 through the energy release air pipe 620 to drive the generator to generate electricity.

[0076] During the storage-release interval, the second valve body 910 , the third valve body 820 and the fourth valve body 920 are all in a closed state to keep the pressure of the thermal storage unit 100 and the cold storage unit 200 constant.

[0077] In addition, it should be noted that when the liquid air energy storage subsystem of this embodiment is operated for the first time, liquid nitrogen is required to pre-cool the cold storage unit 200.

[0078] In summary, the liquid air energy storage subsystem of this embodiment has at least the following advantages: The liquid air energy storage subsystem of the embodiment of the present invention effectively reduces the floor space and improves the safety, environmental protection and efficiency of the system in many aspects. Specifically, the use of a high-pressure solid-phase heat storage and cold storage unit helps to weaken the influence of the thermocline layer and improve the system's electric-electric conversion efficiency compared to normal pressure and low-pressure solid-phase heat storage and cold storage. Placing high-voltage equipment underground reduces the system's floor space and improves the system's safety. The underground high-pressure heat storage and cold storage device adopts a "U"-shaped structure, which can better adapt to the uneven settlement of the stratum and the compression of the soil, reduce the risk of pipeline damage, and improve the reliability and safety of the system. The "U"-shaped structure can ensure the uniformity of the air flow 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. The high-pressure heat storage and cold storage device uses the form of direct heat exchange between air and heat storage and cold storage medium for heat storage and cold storage. 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.

[0079] like Figure 1 and Figure 2 As shown, a specific embodiment of the second aspect 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 of any of the above embodiments. The liquid air energy storage subsystem also includes a turbine unit 630, and 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 and cool down. The air outlet of the turbine unit 630 is used to discharge the cooled air. The material gasification subsystem includes a biomass gasifier 50; the gasifying agent inlet of the biomass gasifier 50 is connected to the air outlet of the turbine unit 630.

[0080] In this embodiment, because it includes the liquid air energy storage subsystem of any of the above embodiments, it has at least the above advantages.

[0081] In addition, by connecting the air outlet of the turbine unit 630 with the gasification agent inlet of the biomass gasification furnace 50 of the biomass gasification subsystem, the air discharged from the turbine unit 630 can be reused, and the clean air of the liquid air energy storage system can be utilized as a resource, thereby improving the system efficiency of the liquid air energy storage system and solving 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.

[0082] 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.

[0083] like Figure 2 As shown, further, the heat storage unit 100 has a heat exchange tube, the heat exchange medium outlet of the heat exchange tube is connected to the heat exchange medium inlet of the heat storage component 90, and the heat exchange medium inlet of the heat exchange tube is connected to the heat exchange medium outlet 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, the heat exchange medium enters the heat exchange tube of the heat storage unit 100 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 air energy storage subsystem can be improved. In addition, the heat exchange medium 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] Specifically, the heat storage assembly 90 includes a heat storage tank 91 and a blower 92; a heat exchange medium 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 the advantages of environmental protection, safety and economy.

[0085] like Figure 1 As shown, in some embodiments, the gasification agent outlet of the biomass gasifier 50 is connected to the heat exchange medium inlet of the heat exchange tube of the heat storage unit 100, and the heat exchange medium outlet of the heat exchange tube is connected to the synthesis gas storage tank 60. The high-temperature synthesizer discharged from the gasification agent outlet of the biomass gasifier 50 directly exchanges heat with the solid-phase heat storage medium in the heat storage chamber 110, so that the solid-phase heat storage medium stores the heat of the synthesizer.

[0086] like Figure 1 and Figure 2 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] It should be noted that the heat exchange medium can be gas or liquid. Preferably, the heat exchange medium is air.

[0092] 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.

[0093] Specifically, the solid phase heat storage medium includes at least one of concrete, rock, gravel, steel, and magnetite.

[0094] like Figures 1 to 4 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.

[0095] 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.

[0096] 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.

[0097] 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 generated by the gasifier is discharged through the cyclone separator 81. The inlet temperature of the cyclone separator 81 is about 700~900℃. 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℃. 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.

[0098] 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.

[0099] like Figure 1 and Figure 2 As shown, 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.

[0100] 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.

[0101] Specifically, the chemical substances produced by the chemical substance production subsystem 8 include methanol or ethanol.

[0102] In summary, the liquid-air energy storage coupling system of the present invention has the following advantages: (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.

[0103] (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.

[0104] (3) The biomass gasification furnace adopts a fluidized bed gasification furnace, which can effectively avoid the problems of bed blockage 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.

[0105] (4) The heat of high-temperature biomass synthesis gas is recovered by solid-phase heat storage medium and reused through circulating air. Compared with the use of liquid-phase heat storage medium, it has the advantages of environmental protection, safety, and economy.

[0106] 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 subsystem, characterized in that: include: A heat storage unit (100) is buried underground; A cold storage unit (200) is buried underground; The cold storage unit (200) is in gas communication with the heat storage unit (100); In the energy storage stage, the heat storage unit (100) is used to store compression heat, and the cold storage unit (200) is used to precool the compressed air discharged from the heat storage unit (100) to liquefy the compressed air; In the energy release phase, the cold storage unit (200) is used to reheat the liquid air, and the heat storage unit (100) is used to reheat the air exhausted from the cold storage unit (200) to gasify the liquid air.

2. The liquid air energy storage subsystem 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; the cold storage unit (200) comprises a cold storage chamber, wherein the cold storage chamber is filled with a solid-phase cold storage medium; the heat storage chamber (110) is in gas communication with the cold storage chamber.

3. The liquid air energy storage subsystem according to claim 2, characterized in that: The heat storage chamber (110) comprises A first straight line segment (111), wherein a first end of the first straight line segment (111) is in communication with an air path of an air compressor unit (710); a second straight line segment (112) disposed on one side of the first straight line segment (111), wherein a first end of the second straight line segment (112) is in communication with the cold storage chamber air path; An arc segment (113), wherein two ends of the arc segment (113) are respectively in air path communication with a second end of the first straight segment (111) and a second end of the second straight segment (112).

4. The liquid air energy storage subsystem according to claim 3, characterized in that: The heat storage unit (100) comprises: An inner shell (120), the inner shell (120) having the heat storage chamber (110); An outer shell (130), the outer shell (130) is formed on the outside of the inner shell (120), and a filling gap (140) is formed between the outer shell (130) and the inner shell (120); the filling gap (140) is used to accommodate a heat-insulating / cold-insulating medium.

5. The liquid air energy storage subsystem according to claim 4, characterized in that: The housing (130) has a recessed portion (131), and the recessed portion (131) is located between the first straight line segment (111) and the second straight line segment (112).

6. The liquid air energy storage subsystem according to claim 1, characterized in that: The operating temperature of the heat 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.

7. The liquid air energy storage subsystem according to claim 2, characterized in that: Also includes: A gas reverse flow component, wherein the gas inlet end of the gas reverse flow component is used to communicate with the gas outlet gas path of the liquid air storage tank (500), and the gas outlet end of the gas reverse flow component is used to communicate with the gas inlet end gas path of the air compressor unit (710).

8. The liquid air energy storage subsystem according to claim 7, characterized in that: The gas reverse flow component comprises: A gas reflux pipe (310), wherein the gas inlet end of the gas reflux pipe (310) is used to communicate with the gas outlet gas path 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 gas communication with the air outlet end of the gas reflux pipe (310); A return pipe (330), the air inlet end of the return pipe (330) being in air communication with the air outlet end of the coil (320), and the air outlet end of the return pipe (330) being in air communication with the air inlet end of the air compressor unit (710); The fifth valve body (340) is arranged on the return pipe (330).

9. The liquid air energy storage subsystem according to any one of claims 1 to 8, characterized in that: Also includes: A pressure reducing component (400), wherein a liquid inlet of the pressure reducing component (400) is connected to a liquid outlet of the cold storage unit (200); The liquid air storage tank (500) is in communication with the liquid outlet of the pressure reducing assembly (400) and is used to store liquid air at normal pressure.

10. A liquid air energy storage coupling system, characterized in that: include: The liquid air energy storage subsystem according to any one of claims 1 to 9, wherein the liquid air energy storage subsystem further comprises a turbine unit (630), the air outlet of the heat storage unit (100) being connected to the air inlet of the turbine unit (630) for conveying high-temperature air to the turbine unit (630), the high-temperature air entering the turbine unit (630) driving the generator to generate electricity and cool down, and the air outlet of the turbine unit (630) being used to discharge the cooled air; A biomass gasification subsystem, the biomass gasification subsystem comprising a biomass gasification furnace (50); a gasifying agent inlet of the biomass gasification furnace (50) is connected to an air outlet of the turbine unit (630).

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