Biomass energy storage power generation system

Abstract

A biomass energy storage power generation system comprises a biomass pretreatment device, a biomass gasification device, a purification device, a biomass fuel storage tank, isothermal compression and expansion, combustion, power generation and other key links. Biomass is gasified and purified after being pretreated, and generated biomass gas fuel is supplied to a combustion chamber. Air is stored in the storage tank after being subjected to multi-stage isothermal compression and cooling, compressed air is output from the isothermal compressor or the compressed air storage tank to be mixed with biomass fuel in the combustion chamber for combustion when power generation is needed, and generated high-temperature and high-pressure gas drives the isothermal expansion machine to do work so as to drive the power generator to generate power. Tail gas of the expansion machine recovers heat through the countercurrent heat exchanger and then is exhausted into air. The system is further provided with a hydraulic power generator and a booster pump, and the pressure of compressed air in the compressed air storage tank is stabilized through water circulation in the water storage tank. According to the whole system, through the multi-stage compression and expansion process and the biomass utilization and energy storage technology, integration of energy storage and power generation of biomass is achieved, and a stable and reliable solution is provided for power supply.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy storage, and particularly relates to a biomass energy storage power generation system. Background Art

[0002] In the wave of the continuous transformation of the global energy structure towards clean and renewable energy, biomass energy storage power generation is an energy utilization method that combines environmental protection and sustainability. With the large-scale deployment of renewable energy sources such as photovoltaic and wind power, although these energy forms have great potential, their inherent instability and uncertainty problems have become increasingly prominent. These challenges not only affect the continuity and stability of energy supply but also pose a severe test to the safe operation of the power grid. In this context, the importance of energy storage + backup systems has become increasingly prominent. This combined strategy can effectively solve the instability and uncertainty problems of renewable energy and ensure the continuity and stability of energy supply.

[0003] Biomass combustion, as a potential renewable fuel, has its unique advantages. If biomass combustion is combined with an energy storage + backup system, an efficient and environmentally friendly biomass energy storage power generation system can be constructed. In such a system, renewable energy such as photovoltaic and wind energy is stored through isothermal compression of air. When the energy demand peaks or the supply of renewable energy is insufficient, the energy is released through the energy storage system. When driving the expansion machine to do work, biomass fuel is mixed with compressed air for combustion to keep the expansion machine undergoing isothermal expansion and improve the power generation efficiency. At the same time, the backup system can provide stable energy support when the supply of photovoltaic or wind energy is interrupted, ensuring the continuity of energy supply. Summary of the Invention

[0004] The utility model provides a biomass energy storage power generation system, which combines isothermal compression and expansion technology, isobaric countercurrent heat exchange, isobaric energy storage technology, and biomass preparation technology. It shows significant advantages in aspects such as energy utilization efficiency, energy supply stability, environmental protection, technological advancement, economic benefits, and system flexibility and scalability.

[0005] Specifically described as follows: A biomass energy storage power generation system includes an isothermal compressor, a cooler, an isothermal expander, a combustion chamber, a biomass pretreatment device, a biomass gasification device, a purification device, a biomass fuel storage tank, a countercurrent heat exchanger, a compressed air storage tank, a reservoir, a hydraulic generator, a pressure pump, a circulating working fluid, and the connecting pipes between them;

[0006] The inlet of the biomass pretreatment device is the inlet of biomass raw materials, and its outlet is connected to the inlet of the biomass gasification device. The outlet of the biomass gasification device is connected to the inlet of the purification device. The outlet of the purification device is connected to the biomass fuel storage tank. The biomass fuel output from the biomass fuel storage tank is connected to the combustion chamber through a pipeline;

[0007] The isothermal compressor is a multi-stage isothermal compressor; the working fluid inlet of the isothermal compressor is directly connected to air, and the working fluid outlet of the isothermal compressor is connected to the inlet of the compressed air storage tank / the working fluid inlet of the countercurrent heat exchanger; the cooler includes multiple coolers, and one cooler is installed on the compressed working fluid pipeline between every two stages of the isothermal compressor;

[0008] The isothermal expander is a multi-stage isothermal expander; the combustion chamber includes multiple combustion chambers, and one combustion chamber is installed on the expanded working fluid pipeline between every two stages of the isothermal expander or on the working fluid pipeline between the countercurrent heat exchanger and the first-stage isothermal expander;

[0009] The hydraulic generator and the pressure pump are connected in parallel between the compressed air storage tank and the reservoir;

[0010] The compressed air storage tank is connected to the inlet of the working fluid channel of the countercurrent heat exchanger through a pipeline, and the outlet of the working fluid channel of the countercurrent heat exchanger is connected to the working fluid inlet of the first-stage combustion chamber; the tail gas outlet of the last-stage isothermal expander is connected to the inlet of the tail gas channel of the countercurrent heat exchanger, and the outlet of the tail gas channel of the countercurrent heat exchanger is connected to air.

[0011] Further, the cooler is a water cooling tower or an air-cooled cooler, and the inlet / outlet of the air medium channel of the cooler is respectively connected to the working fluid outlet of the upper-stage isothermal compressor / the working fluid inlet of the lower-stage isothermal compressor.

[0012] Further, the isothermal compressor is of centrifugal or axial flow type and is composed of multiple stages of isothermal compressors connected in series.

[0013] Further, the isothermal expander is of turbine type and is composed of multiple stages of expanders connected in series.

[0014] Further, the circulating working fluid is air.

[0015] By designing the countercurrent heat exchanger to recover the heat of the high-temperature tail gas finally discharged by the isothermal expansion and using it for the preheating of compressed air, the energy utilization rate can be significantly improved.

[0016] The present utility model proposes a combined strategy for an energy storage and backup energy system, which solves the two major problems of the instability and uncertainty of renewable energy.

[0017] When dealing with the instability of renewable energy, energy storage systems can effectively store excess energy and release it when needed, balancing energy supply and demand and ensuring the stable operation of the system. This has brought about a fundamental reform to the power system by decoupling power generation and consumption. Especially in the field of new energy generation, such as photovoltaic and wind power generation, energy storage technologies can alleviate the volatility and intermittency of these new energy sources, reduce the impact of instantaneous changes on the power grid, reduce the phenomena of "abandoning light and wind", and improve the stability and reliability of power grid operation. When dealing with the uncertainty of renewable energy, that is, in an emergency of power shortage, if there is neither solar energy supply nor sufficient stored energy available, the power system will directly activate the backup energy cycle system. The backup energy system serves as another safeguard to provide stable energy support, ensuring the continuity of energy supply and effectively making up for the limitations of renewable energy.

[0018] The utility model has the following advantages:

[0019] 1) Technical advancement and innovation: This system integrates isothermal compression and expansion technology, isobaric countercurrent heat exchange technology, and isobaric energy storage technology. The entire system can switch working modes according to needs, not only ensuring the stability and continuity of energy conversion, achieving the maximum utilization of energy, but also improving the operation efficiency and stability of the system, and bringing new development opportunities to the field of biomass energy storage power generation;

[0020] 2) Improving the stability of energy supply: This system can serve as a backup energy power generation system and can provide stable energy support when the supply of renewable energy (such as photovoltaic and wind power) is insufficient or interrupted;

[0021] 3) System flexibility and scalability: This system has good flexibility and scalability and can be customized and optimized according to different energy demands and site conditions. At the same time, with the continuous progress of technology and the continuous development of the market, this system can also be upgraded and expanded to adapt to more application scenarios and demands;

[0022] 4) Significant economic benefits: Due to high energy utilization efficiency, stable energy supply, and environmental protection advantages, this biomass energy storage power generation system has significant economic benefits. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Appendix Figure 1It is a schematic diagram of the structure and principle of the energy storage power generation system of the present utility model.

[0025] The meanings represented by the serial numbers in the above figures are as follows: 1 isothermal compressor; 11 primary isothermal compressor; 12 secondary isothermal compressor; 1m final-stage isothermal compressor; 2 cooler; 21 primary cooler; 22 secondary cooler; 2m-1 final-stage cooler; 3 countercurrent heat exchanger; 4 compressed air storage tank; 5 combustion chamber; 51 primary combustion chamber; 52 secondary combustion chamber; 5n final-stage combustion chamber; 6 isothermal expander; 61 primary isothermal expander; 62 secondary isothermal expander; 6n final-stage isothermal expander; 7 reservoir; 201 main inlet pipe for cooling medium; 202 main outlet pipe for cooling medium; 9 control device; 101 first valve; 102 second valve; 103 third valve; 104 fourth valve; 110 hydraulic generator; 120 pressure pump; 130; biomass pretreatment device; 140 biomass gasification device; 150 purification device; 160 biomass fuel storage tank. Specific embodiments

[0026] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions of the present utility model will be described in detail below.

[0027] Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of them.

[0028] Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model. To make the embodiments easier to understand, multiple embodiments or implementation methods are provided below to illustrate the related devices, modules, and functions of the present utility model.

[0029] To enable the readers of this embodiment to quickly understand the implementation manner of the present utility model, the working principle expressed in the attached Figure 1 will be described first.

[0030] As shown in the attached Figure 1 A biomass energy storage power generation system includes: an isothermal compressor 1, a cooler 2, an isothermal expander 6, a combustion chamber 5, a biomass pretreatment device 130, a biomass gasification device 140, a purification device 150, a biomass fuel storage tank 160, a countercurrent heat exchanger 3, a compressed air storage tank 4, a reservoir 7, a hydraulic generator 110, a pressure pump 120, a control device 9, a circulating working fluid, and the connecting pipes between them.

[0031] The inlet of the biomass pretreatment device 130 is connected to the biomass raw material inlet, and its outlet is connected to the inlet of the biomass gasification device 140. The outlet of the biomass gasification device 140 is connected to the inlet of the purification device 150. The outlet of the purification device 150 is connected to the inlet of the biomass fuel storage tank 160. The biomass fuel output from the outlet of the biomass fuel storage tank 160 is connected to each combustion chamber 51 - 5n through a pipeline, providing a continuous supply of biomass fuel for the combustion chamber 5. The function of the biomass pretreatment device 130 is to perform processes such as crushing, drying, and granulation on biomass. The function of the biomass gasification device 140 is to convert the pretreated biomass into biomass gas fuel, which includes carbon monoxide, hydrogen, methane, etc. At the same time, some non-combustible gases and solid by-products are also generated. The purification device 150 purifies the biomass gas fuel produced by the biomass gasification device 140 to remove impurities and pollutants inside. The function of the biomass fuel storage tank 160 is to store the purified biomass gas fuel.

[0032] The function of the isothermal compressor 1 is to inhale the working medium air and perform multi-stage isothermal compression on the working medium air to boost the pressure of the working medium. The isothermal compressor 1 is a multi-stage isothermal compressor, including m stages of compressors 11 - 1m (m ≥ 2); each of the isothermal compressors 11 - 1m is connected in series coaxially; the working medium inlet of the first-stage isothermal compressor 11 is directly connected to the air, and the outlet of the last-stage isothermal compressor 1m is connected to the working medium inlet of the compressed air storage tank 4 / countercurrent heat exchanger 3.

[0033] The cooler 2 is installed on the compressed working medium pipeline between every two stages of isothermal compressors, including 2m - 1 coolers; the inlet / outlet of the air medium channel of the cooler 2 is respectively connected to the working medium outlet of the previous-stage isothermal compressor / the working medium inlet of the next-stage isothermal compressor; the function of the cooler 2 is to dissipate the heat generated by the compression of the compressed air by the isothermal compressor 1 to the outside, keeping the compression process at a relatively low temperature to achieve approximate "isothermal compression".

[0034] The water outlet of the hydraulic generator 110 is connected to the water storage tank 7 through a pipeline; the water inlet of the hydraulic generator 110 is connected to the bottom end of the compressed air storage tank 4 through a pipeline. The hydraulic generator 110 is used to stabilize the pressure of the compressed air after multi-stage isothermal compression when it enters the compressed air storage tank 4. During this process, the high-pressure compressed air enters the compressed air storage tank 4, and the water in the compressed air storage tank 4 is forced outwards under the action of the high-pressure gas. The discharged high-pressure water drives the hydraulic generator 110 to operate and generate electricity;

[0035] The pressure pump 120 is connected in parallel between the bottom of the compressed air storage tank 4 and the bottom end of the reservoir 7; the function of the pressure pump 120 is to inject water into the compressed air storage tank 4, and the water compresses the air in the compressed air storage tank 4, causing the air in the compressed air storage tank 4 to flow back, so that the compressed air in the compressed air storage tank 4 enters the countercurrent heat exchanger 3 directly at a constant pressure.

[0036] The isothermal expander 6 includes n stages of isothermal expanders (n≥2); each stage of isothermal expanders 61-6n are coaxially connected in series; the combustion chamber 5 includes a plurality of combustion chambers equal in number to the isothermal expanders, and the combustion chamber 5 is installed on the expansion working medium pipeline between every two stages of isothermal expanders or on the working medium pipeline between the countercurrent heat exchanger 3 and the first-stage isothermal expander 61, that is, the first-stage combustion chamber 51 is installed on the working medium pipeline between the working medium channel of the countercurrent heat exchanger 3 and the first-stage isothermal expander 61; the inlets / outs of the combustion chambers 52-5n are respectively connected to the working medium outlet of the upper-stage isothermal expander / the working medium inlet of the lower-stage isothermal expander; the working medium outlet of the last-stage isothermal expander 6n is connected to the tail gas inlet of the countercurrent heat exchanger 3, and the heat of the tail gas after isothermal expansion is recovered through the countercurrent heat exchanger 3 and used for preheating before the compressed air does work, and the finally cooled tail gas is discharged into the air.

[0037] The function of the compressed air storage tank 4 is to store / release the compressed air medium after multi-stage isothermal compression. It is connected to the inlet of the working medium channel of the countercurrent heat exchanger 3 through a pipeline, and the outlet of the working medium channel of the countercurrent heat exchanger 3 is connected to the working medium inlet of the primary combustion chamber 51; the tail gas outlet of the last-stage isothermal expander 6n is connected to the inlet of the tail gas channel of the countercurrent heat exchanger 3, and the outlet of the tail gas channel of the countercurrent heat exchanger 3 is directly connected to the air.

[0038] The function of the countercurrent heat exchanger 3 is to recover the heat of the high-temperature tail gas after isothermal expansion and use the recovered heat for preheating before the compressed air does work; that is, the high-pressure and low-temperature compressed air exchanges heat with the tail gas discharged from the last-stage isothermal expander 6n in the countercurrent heat exchanger 3, and the high-pressure and low-temperature compressed air absorbs the heat of the tail gas for one-time preheating and then enters the primary combustion chamber 51.

[0039] The combustion chamber 5 is injected with biomass gas fuel and mixed with the circulating working medium air entering the combustion chamber and then burns fully to generate tail gas. The isothermal expander 6 is connected to the combustion chamber and is driven by the tail gas generated by the combustion chamber 5 to generate power for electricity generation.

[0040] If the cooler 2 is a water-cooled cooler, the inlets / outs of the cooling medium channel of the cooler 2 are respectively connected to the out / inlets of the cold water source; if the cooler 2 is an air-cooled cooler, the inlets / outs of the cooling medium channel of the cooler 2 are both connected to the air.

[0041] The circulating working medium is air.

[0042] The working cycle of the power generation system of the present utility model has three processes, namely direct compressed air power generation (backup energy cycle system), energy storage working cycle, and energy storage power generation working cycle process.

[0043] In the emergency of power shortage, if there is neither solar energy supply nor sufficient stored energy available, the power system will directly activate direct compressed air power generation, that is, the standby energy cycle system. The process of direct compressed air power generation is as follows: the isothermal compressor 1, the isothermal expander 6, the first valve 101 and the second valve 102 are opened; the hydraulic generator 110, the pressure pump 120, the third valve 103, the fourth valve 104 and the fifth valve 105 are closed. In this process, the primary isothermal compressor 11 sucks in the working medium air from the air for compression, and the temperature and pressure of the working medium air both rise; to avoid too much increase in the working medium temperature, the once-pressurized working medium air after passing through the primary isothermal compressor 11 directly enters the primary cooler 21 for cooling, and after cooling, the once-pressurized working medium air enters the secondary isothermal compressor 12 for secondary compression. The pressurized working medium air compressed by the secondary isothermal compressor 12 enters the secondary cooler 22 for cooling, and so on until the compression reaches the predetermined pressure in the final-stage isothermal compressor 1m, and then directly enters the working medium channel of the countercurrent heat exchanger 3, where it exchanges heat with the high-temperature last-stage exhaust gas discharged from the final-stage isothermal expander 6n. The compressed air discharged from the final-stage isothermal compressor 1m absorbs the heat of the high-temperature last-stage exhaust gas and is preheated to become high-pressure medium-temperature compressed air; in order to achieve approximate isothermal expansion, before the compressed air after heat absorption enters the isothermal expander 6, it first enters the combustion chamber 5 to mix and burn fully with the biomass gas fuel and generate exhaust gas, and the exhaust gas drives the corresponding isothermal expander 6 to do work; that is, the compressed air preheated to become high-pressure medium-temperature first enters the primary combustion chamber 51. At the same time, the biomass raw material is sent to the biomass pretreatment device 130 for pretreatment and then sent to the biomass gasification device 140. The biomass gasification device 140 makes the biomass into biomass gas fuel. The biomass gas fuel coming out of the biomass gasification device 140 is sent to the purification device 150 for purification treatment, and then stored in the biomass fuel storage tank 160 for use in the combustion chamber 5; finally, the biomass gas fuel in the biomass fuel storage tank 160 is sent to the primary combustion chamber 51 through a pipeline, where it is fully mixed with the compressed air for primary combustion. The primary exhaust gas discharged after combustion enters the primary expander 61 to drive the primary expander 61 to generate power; the primary exhaust gas discharged from the primary expander 61 directly enters the secondary combustion chamber 52. At the same time, the biomass gas fuel coming out of the biomass fuel storage tank 160 is sent to the secondary combustion chamber 52 through a pipeline and fully mixed with the primary exhaust gas for secondary combustion. The secondary exhaust gas discharged from the secondary combustion is used to drive the secondary expander 62 to generate power. In this way, the exhaust gas reaches the last combustion chamber 5n to be mixed with the biomass gas fuel for the last combustion, driving the last expander 6n to generate power. Such a cycle of operation completes the entire cycle process.

[0044] The working cycle of energy storage is that when renewable energy (such as solar energy and wind energy) is abundant or electricity consumption at night decreases, the surplus electricity drives the compressor to work, compresses and stores air, and realizes the efficient conversion of mechanical energy into compressed air potential energy. The working cycle process of energy storage is as follows: the isothermal compressor 1, the hydraulic generator 110, the first valve 101, the fourth valve 104 and the fifth valve 105 are opened, and the isothermal expander 6, the pressure pump 120, the second valve 102 and the third valve 103 are closed. In this process, the primary isothermal compressor 11 sucks in the working medium air from the air for compression, and the temperature and pressure of the working medium air both rise; to avoid too much increase in the working medium temperature, the working medium air after being pressurized once by the primary isothermal compressor 11 directly enters the primary cooler 21 for cooling, and after cooling, the once-pressurized working medium air enters the secondary isothermal compressor 12 for secondary pressurization, and then after secondary pressurization, the working medium air enters the secondary cooler 22 for cooling. This continues until it is compressed to a predetermined pressure in the final-stage isothermal compressor 1m and then directly enters the compressed air storage tank 4. At the same time, the water in the compressed air storage tank 4 is pressed outwards under the action of the high-pressure gas, and the high-pressure water discharged from the compressed air storage tank 4 drives the hydraulic generator 110 to operate and generate electricity; the water output from the water outlet of the hydraulic generator 110 finally enters the water storage tank 7, and thus the energy storage process is completed by working in a cycle.

[0045] The energy storage power generation working cycle is that when the power demand is at a peak or the renewable energy supply is insufficient, the compressed air in the compressed air storage tank 4 is released through a pipeline and fully mixed with fuel in the combustion chamber 5 for combustion, providing sufficient energy for the subsequent power generation process and providing stable and efficient power support. Energy storage power generation working cycle process: The isothermal compressor 1, the first valve 101, and the fourth valve 104 are closed, and the isothermal expander 6, the pressure pump 120, the second valve 102, the third valve 103, and the fifth valve 105 are opened. During this process, the pressure pump 120 injects water into the compressed air storage tank 4, and the water compresses the compressed air in the compressed air storage tank 4. The compressed air in the compressed air storage tank 4 flows back. In this way, the compressed air with a certain pressure comes out of the compressed air storage tank 4 and directly enters the working fluid channel of the countercurrent heat exchanger 3, where it exchanges heat with the high-temperature last-stage exhaust gas discharged from the last-stage isothermal expander 6n. The compressed air discharged from the compressed air storage tank 4 is preheated by the high-temperature last-stage exhaust gas and becomes compressed air at high pressure and medium temperature; at the same time, the biomass raw material is sent to the biomass pretreatment device 130 for pretreatment and then sent to the biomass gasification device 140. The biomass gasification device 140 converts the biomass into biomass gas fuel. The biomass gas fuel coming out of the biomass gasification device 140 is sent to the purification device 150 for purification treatment and then stored in the biomass fuel storage tank 160 for use in the combustion chamber 5. The compressed air that has been preheated to high pressure and medium temperature first enters the primary combustion chamber 51. At the same time, the biomass gas fuel in the biomass fuel storage tank 160 is sent to the primary combustion chamber 51 through a pipeline. In the primary combustion chamber 51, it is fully mixed with the compressed air for primary combustion. The primary exhaust gas discharged after combustion enters the isothermal primary expander 61 to drive the isothermal primary expander 61 to generate power for electricity generation; the cooled and depressurized primary exhaust gas discharged from the isothermal primary expander 61 enters the secondary combustion chamber 52, where it is mixed with the injected biomass gas fuel and burns fully again to generate secondary exhaust gas. Subsequently, the secondary exhaust gas enters the isothermal secondary expander 62, and the isothermal secondary expander 62 is driven by the secondary exhaust gas to generate power for electricity generation; in this way, the exhaust gas reaches the last combustion chamber 5n and is mixed with the biomass gas fuel for last combustion to generate last exhaust gas. The last exhaust gas drives the last expander 6n to generate power for electricity generation. The last exhaust gas discharged from the last expander 6n is not directly discharged into the air, but directly enters the exhaust gas channel of the countercurrent heat exchanger 3 for heat recovery. The last exhaust gas discharged from the countercurrent heat exchanger 3 has a temperature close to the ambient temperature and is directly discharged into the environment. Such a cycle of operation completes the entire cycle process.

[0046] As described above, the main purpose of adopting multi-stage compression is to avoid the temperature during the compression process rising too high because we want to achieve "approximate" isothermal compression. The entire compression process is completed by the isothermal compressor 1. To achieve approximate isothermal compression, the cooler 2 is used to dissipate the compression heat of each stage of the isothermal compressor into the external air; for this purpose, the cooler 2 is installed between every two stages of the isothermal compressor to promptly dissipate the compression heat.

[0047] As described above, the main purpose of adopting multi-stage isothermal expansion is to gradually reduce the pressure of the working medium through multi-stage isothermal expansion and avoid large temperature differences and low efficiency during the expansion process because we want to achieve "approximate" isothermal expansion. The entire expansion process is completed by the isothermal expander 6. To achieve approximate isothermal expansion, the working medium air before entering the isothermal expander 6 first mixes with fuel in the combustion chamber 5 and burns fully to generate exhaust gas with a constant temperature to drive each stage of the isothermal expander to do work.

[0048] As described above for the power generation system, since the isothermal compressor is divided into multiple stages and the temperature rise during each stage of compression is limited to a small temperature difference value, and in addition, after each compression, the cooler is used to lower the temperature of the compressed working medium, this approximately realizes the process of "isothermal compression"; by using a similar method, an approximate "isothermal expansion" process of the working medium during the expansion process is realized. This makes the entire thermodynamic process closer to the "Carnot cycle" process, so a relatively high system thermal efficiency can be obtained.

[0049] By adopting the method of multi-stage expansion accompanied by multi-stage combustion heating, compared with the single-stage expansion or a small number of stages of expansion process, the working medium can maintain a relatively high temperature and a relatively high average temperature throughout the expansion process. According to the Carnot cycle principle, the higher this temperature, the higher the efficiency of the thermodynamic system. Similarly, through multi-stage compression and heat dissipation cooling, the compression process is maintained at a relatively low temperature to achieve approximate "isothermal compression", which also improves the efficiency of the thermodynamic system. By comparing the maximum efficiency of the theoretical cycle, the potential for efficiency improvement of the present invention can be understood.

[0050] To further improve the embodiment of the present invention, a control scheme for the power generation system of this embodiment is provided here, that is: a set of control device 9 is configured for this power generation system. A relatively preferred control device is the DCS system. Using this DCS system, the components of the power generation system can be comprehensively controlled hierarchically and the mutual influence between each controller device can be reduced. The DCS control system collects the working parameters of each component of the power generation equipment, including but not limited to temperature, pressure, flow rate, stress, displacement, vibration, position, current, voltage, resistance, frequency, power, and comprehensively controls and protects the operation of each component.

Claims

1. A biomass energy storage power generation system, characterized in that: It includes an isothermal compressor, a cooler, an isothermal expander, a combustion chamber, a biomass pretreatment device, a biomass gasification device, a purification device, a biomass fuel storage tank, a countercurrent heat exchanger, a compressed air storage tank, a water reservoir, a hydraulic generator, a booster pump, a circulating working fluid and connecting pipes therebetween; The inlet of the biomass pretreatment device is the inlet of the biomass raw material, and its outlet is connected to the inlet of the biomass gasification device, the outlet of the biomass gasification device is connected to the inlet of the purification device, the outlet of the purification device is connected to the biomass fuel storage tank, and the biomass fuel output from the biomass fuel storage tank is connected to the combustion chamber through a pipeline; The isothermal compressor is a multi-stage isothermal compressor; the working fluid inlet of the isothermal compressor is directly connected to the air, and the working fluid outlet of the isothermal compressor is connected to the working fluid inlet of the compressed air storage tank / countercurrent heat exchanger; the cooler includes a plurality of coolers, and a cooler is installed on the compressed working fluid pipeline between each two stages of the isothermal compressor; The isothermal expander is a multi-stage isothermal expander; the combustion chamber includes a plurality of combustion chambers, and a combustion chamber is installed on the expansion working medium pipeline between each two stages of isothermal expanders or on the working medium pipeline between the countercurrent heat exchanger and the first stage isothermal expander; The hydraulic generator and the booster pump are connected in parallel between the compressed air storage tank and the water reservoir; The compressed air storage tank is connected to the working fluid channel inlet of the countercurrent heat exchanger through a pipeline, and the outlet of the working fluid channel of the countercurrent heat exchanger is connected to the working fluid inlet of the first-stage combustion chamber; the exhaust gas outlet of the last-stage isothermal expander is connected to the exhaust gas channel inlet of the countercurrent heat exchanger, and the exhaust gas channel outlet of the countercurrent heat exchanger is connected to the air.

2. A biomass energy storage power generation system as claimed in claim 1, characterized in that: The cooler is a water cooling tower or an air-cooled cooler, and the inlet / outlet of the air medium channel of the cooler is respectively connected to the working medium outlet of the previous stage isothermal compressor / the working medium inlet of the next stage isothermal compressor.

3. A biomass energy storage power generation system as claimed in claim 1, characterized in that: The isothermal compressor is of centrifugal or axial flow type and is composed of multiple stages of isothermal compressors connected in series.

4. A biomass energy storage power generation system as claimed in claim 1, characterized in that: The isothermal expander is of turbine type and is composed of multiple expanders connected in series.

5. The biomass energy storage power generation system according to claim 1, characterized in that: The circulating working medium is air.

Images