Biomass power plant coupling pyrolysis poly-generation peak shaving system

Abstract

The biomass power plant coupling pyrolysis poly-generation peak shaving system comprises a biomass boiler, a steam turbine and a power generator, an inlet of the biomass boiler is used for introducing biomass raw materials, a steam outlet of the biomass boiler communicates with a steam inlet of the steam turbine, and the steam turbine is connected with the power generator and can drive the power generator to generate power; an inlet of the drying device is used for introducing a biomass raw material, and the drying device is used for drying the biomass raw material; an inlet of the pyrolysis device communicates with an outlet of the drying device, and the pyrolysis device is used for pyrolyzing the biomass raw materials into pyrolysis gas and pyrolysis carbon; and an inlet of the supercharging device communicates with the first outlet, and an outlet of the supercharging device communicates with an inlet of the biomass boiler. Therefore, the coupling pyrolysis poly-generation peak shaving system of the biomass power plant has the advantages of being high in safety and convenient to peak shaving.

Description

Technical Field

[0001] The present invention relates to the technical field of biomass power generation, and particularly relates to a biomass power plant coupled with pyrolysis polygeneration peak shaving system. Background Art

[0002] Biomass energy resources are rich in reserves, wide in source, and low in cost. Among all the developed renewable energy sources, it is the only clean energy that can be stored and transported, and has great development potential. Biomass energy thermal utilization technologies include physical and chemical methods, thermochemical methods, chemical methods, and biochemical methods, and can be further subdivided into biomass direct combustion, biomass liquefaction, biomass gasification, biomass pyrolysis, biomass esterification, biomass hydrolysis fermentation, etc. Among them, the development of biomass pyrolysis and biomass gasification technologies has attracted more attention, and biomass direct combustion power generation is the most mature.

[0003] In related technologies, the process route of first spraying and cooling to remove tar and then burning is generally adopted. The disadvantages of this process route are: a large amount of industrial wastewater containing tar is generated, and the wastewater needs to be secondary-treated and discharged after reaching the standard; the heat carried by the high-temperature biomass pyrolysis gas itself is carried away by the condensed water and not utilized, resulting in energy waste; the heat of the tar is not effectively utilized, and the condensed tar is usually buried in place, causing soil pollution; the high-carbon alkane gas in the high-temperature biomass pyrolysis gas burns incompletely, resulting in black smoke. These are all bottleneck problems that need to be solved urgently in the field of utilization of high-temperature biomass pyrolysis gas. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related technologies to some extent. For this reason, an embodiment of the present invention provides a biomass power plant coupled with pyrolysis polygeneration peak shaving system.

[0005] The biomass power plant coupled with pyrolysis polygeneration peak shaving system according to the embodiment of the present invention includes:

[0006] A biomass boiler, a steam turbine, and a generator. The inlet of the biomass boiler is used to introduce biomass raw materials. The steam outlet of the biomass boiler is communicated with the steam inlet of the steam turbine. The steam turbine is connected to the generator and can drive the generator to generate electricity;

[0007] A drying device. The inlet of the drying device is used to introduce biomass raw materials. The drying device is used to dry the biomass raw materials;

[0008] A pyrolysis device. The inlet of the pyrolysis device is communicated with the outlet of the drying device. The pyrolysis device is used to pyrolyze biomass raw materials into pyrolysis gas and pyrolysis carbon. The pyrolysis device has a first outlet and a second outlet. The first outlet is used to discharge the pyrolysis gas, and the second outlet is used to discharge the pyrolysis carbon;

[0009] A pressurizing device, the inlet of the pressurizing device is communicated with the first outlet, the outlet of the pressurizing device is communicated with the inlet of the biomass boiler, the pressurizing device can pressurize the pyrolysis gas and introduce it into the biomass boiler, and the pressurizing device can control the flow rate of the pyrolysis gas introduced into the biomass boiler so as to adjust the power generation amount of the generator.

[0010] Therefore, the biomass power plant coupled pyrolysis polygeneration peak shaving system according to the embodiment of the present invention has the advantages of high safety and convenient peak shaving.

[0011] In some embodiments, the pressurizing device has an ejector inlet for introducing an ejector gas, the pressure of the ejector gas is greater than or equal to a first preset value, the ejector gas is mixed with the pyrolysis gas in the pressurizing device to form a pyrolysis mixed gas and introduced into the biomass boiler, and at least one of the pressure and flow rate of the ejector gas introduced into the pressurizing device can be controlled so as to control the flow rate of the pyrolysis mixed gas introduced into the biomass boiler.

[0012] In some embodiments, the biomass power plant coupled pyrolysis polygeneration peak shaving system includes a gas mixing device, and the outlet of the gas mixing device is communicated with the ejector inlet;

[0013] The ejector gas includes a combustible gas and a non-combustible gas. The combustible gas can be used as the ejector gas and introduced into the pressurizing device, the non-combustible gas can be used as the ejector gas and introduced into the pressurizing device, and the combustible gas and the non-combustible gas can be mixed in the gas mixing device according to a preset ratio and then used as the ejector gas and introduced into the pressurizing device;

[0014] The energy of the fuel introduced into the biomass boiler can be controlled by controlling the ratio of the combustible gas to the non-combustible gas in the ejector gas, and the power generation amount of the generator can be adjusted by controlling at least one of the type, pressure and flow rate of the ejector gas.

[0015] In some embodiments, the ratio of the amount of biomass raw material consumed by the biomass boiler per unit time to the amount of biomass raw material consumed by the pyrolysis device per unit time is (2 - 10):1.

[0016] In some embodiments, the mass ratio of the moisture in the dried biomass raw material to the mass of the dried biomass raw material is (0.1 - 0.15):1;

[0017] The flue gas outlet of the biomass boiler is communicated with the flue gas inlet of the drying device so that the drying device can use the heat in the flue gas discharged from the biomass boiler to dry the biomass raw material;

[0018] Alternatively, the steam outlet of the biomass boiler is connected to the steam inlet of the drying device so that the drying device can utilize the heat in the steam discharged from the biomass boiler to dry the biomass raw materials.

[0019] The biomass power plant coupled pyrolysis polygeneration peak shaving system according to an embodiment of the present invention further includes a desuperheater and pressure reducer. The steam outlet of the biomass boiler is connected to the desuperheater and pressure reducer. The desuperheater and pressure reducer is connected in parallel with the steam turbine. A first valve is provided at the inlet of the desuperheater and pressure reducer.

[0020] In some embodiments, at least one of the steam outlet of the desuperheater and pressure reducer and the steam outlet of the steam turbine is connected to the steam inlet of the drying device so that the drying device can utilize the heat in the steam discharged from at least one of the desuperheater and pressure reducer and the biomass boiler to dry the biomass raw materials.

[0021] The biomass power plant coupled pyrolysis polygeneration peak shaving system according to an embodiment of the present invention further includes an activation device. The steam inlet of the activation device is connected to the steam outlet of the desuperheater and pressure reducer and the steam outlet of the steam turbine so that the activation device can convert the pyrolysis carbon into activated carbon by using the steam discharged from the desuperheater and pressure reducer and the steam turbine.

[0022] The biomass power plant coupled pyrolysis polygeneration peak shaving system according to an embodiment of the present invention includes a feeding device. The feeding device has a feeding inlet, a first feeding outlet, and a second feeding outlet. The feeding inlet is used for introducing biomass raw materials. The biomass raw materials in the feeding device can be discharged from the first feeding outlet and the second feeding outlet. The feeding device can adjust the amount of biomass raw materials discharged from the first feeding outlet and the amount of biomass raw materials discharged from the second feeding outlet. The first feeding outlet is connected to the inlet of the biomass boiler. The second feeding outlet is connected to the inlet of the drying device.

[0023] The biomass power plant coupled pyrolysis polygeneration peak shaving system according to an embodiment of the present invention includes a crushing device. The crushing device is used for crushing biomass raw materials so that the particle size of the crushed biomass raw materials is less than or equal to 3 cm. The outlet of the crushing device is connected to the feeding inlet of the feeding device. Description of the Drawings

[0024] Figure 1 is a schematic diagram of a biomass power plant coupled pyrolysis polygeneration peak shaving system according to an embodiment of the present invention.

[0025] Figure 2 is a schematic diagram of a biomass power plant coupled pyrolysis polygeneration peak shaving system according to another embodiment of the present invention.

[0026] Figure 3Schematic diagram of a biomass power plant coupled with pyrolysis polygeneration peak shaving system according to another embodiment of the present invention.

[0027] Figure 4 Schematic diagram of a biomass power plant coupled with pyrolysis polygeneration peak shaving system according to yet another embodiment of the present invention.

[0028] Reference numerals: 1, biomass boiler; 2, steam turbine; 3, generator; 4, drying device; 5, pyrolysis device, 51, first outlet; 52, second outlet; 6, pressurizing device, 61, ejector inlet; 7, gas mixing device; 8, desuperheating and pressure reducing device; 9, activation device; 10, feeding device; 11, feeding inlet; 12, first feeding outlet; 13, second feeding outlet; 14, crushing device. Detailed Description of the Invention

[0029] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0030] The biomass power plant coupled with pyrolysis polygeneration peak shaving system according to the embodiment of the present invention will be described below with reference to the accompanying drawings. As Figures 1 to 4 shown, the biomass power plant coupled with pyrolysis polygeneration peak shaving system according to the embodiment of the present invention includes a biomass boiler 1, a steam turbine 2, a generator 3, a drying device 4, a pyrolysis device 5, and a pressurizing device 6.

[0031] The inlet of the biomass boiler 1 is used to introduce biomass raw materials. The steam outlet of the biomass boiler 1 is communicated with the steam inlet of the steam turbine 2. The steam turbine 2 is connected to the generator 3 and can drive the generator 3 to generate electricity. Specifically, the biomass raw materials are directly burned in the biomass boiler 1 to generate superheated steam, and the superheated steam is introduced into the steam turbine 2 to do work so that the steam turbine 2 drives the generator 3 to generate electricity.

[0032] The inlet of the drying device 4 is used to introduce biomass raw materials, and the drying device 4 is used to dry the biomass raw materials. The inlet of the pyrolysis device 5 is communicated with the outlet of the drying device 4. The pyrolysis device 5 is used to pyrolyze the biomass raw materials into pyrolysis gas and pyrolysis carbon. The pyrolysis device 5 has a first outlet 51 and a second outlet 52. The first outlet 51 is used to discharge the pyrolysis gas, and the second outlet 52 is used to discharge the pyrolysis carbon. Thus, the biomass raw materials dried in the drying device 4 can be introduced into the pyrolysis device 5 for pyrolysis, so as to facilitate the generation of pyrolysis gas and pyrolysis carbon. The generated pyrolysis gas is a high-temperature (400°C - 500°C) combustible gas. The drying medium of the drying device 4 can be steam or flue gas. The pyrolysis device 5 includes a fixed-bed pyrolysis furnace, a downer-bed pyrolysis furnace, a rotating-bed pyrolysis furnace, and a rotary-kiln pyrolysis furnace. For example, the pyrolysis device 5 is a rotary-kiln pyrolysis furnace. The pyrolysis temperature is controlled at 450°C - 650°C.

[0033] The inlet of the pressurizing device 6 is communicated with the first outlet 51, and the outlet of the pressurizing device 6 is communicated with the inlet of the biomass boiler 1. The pressurizing device 6 can pressurize the pyrolysis gas and then introduce it into the biomass boiler 1, so that the high-temperature pyrolysis gas can be introduced into the biomass boiler 1 for combustion, and the air in the biomass boiler 1 can be prevented from entering the pressurizing device 6 and the pyrolysis device 5, thereby increasing safety. Specifically, the flow rate and pressure of the pressurizing device 6 are interlocked with the pressure of the pyrolysis device 5, that is, the pressure of the pyrolysis device 5 is regulated by the flow rate and pressure of the pressurizing device 6.

[0034] The pressurizing device 6 can control the flow rate of the pyrolysis gas introduced into the biomass boiler 1 so as to adjust the power generation of the generator 3. Thus, when peak shaving of the system is required, the flow rate of the pyrolysis gas that can be introduced into the biomass boiler 1 by controlling the pressurizing device 6 can be used to quickly adjust the amount of superheated steam generated by the biomass boiler 1, and then the power generation of the generator 3 can be adjusted. When the power generation needs to be increased, the flow rate of the pyrolysis gas introduced into the biomass boiler 1 by controlling the pressurizing device 6 is increased, so as to increase the energy of the fuel (pyrolysis gas) in the biomass boiler 1, and then it is convenient to increase the power generation; when the power generation needs to be reduced, the flow rate of the pyrolysis gas introduced into the biomass boiler 1 by controlling the pressurizing device 6 is reduced, so as to reduce the energy of the fuel (pyrolysis gas) in the biomass boiler 1, and then it is convenient to reduce the power generation.

[0035] Therefore, the biomass power plant coupled pyrolysis polygeneration peak shaving system according to the embodiment of the present invention has the advantages of high safety and convenient peak shaving.

[0036] As Figures 1 to 4 shown, the biomass power plant coupled pyrolysis polygeneration peak shaving system according to the embodiment of the present invention includes a crushing device 14 and a feeding device 10.

[0037] The crushing device 14 is used for crushing biomass raw materials, and the crushing device 14 is used for crushing biomass raw materials so that the particle size of the crushed biomass raw materials is less than or equal to 3 cm. Thus, the particle size of the crushed biomass raw materials can be made smaller, which is convenient for the combustion and pyrolysis of biomass raw materials.

[0038] The feeding device 10 has a feeding inlet 11, a first feeding outlet 12 and a second feeding outlet 13. The feeding inlet 11 is used for introducing biomass raw materials, and the outlet of the crushing device 14 is communicated with the feeding inlet 11 of the feeding device 10 so as to introduce the crushed biomass raw materials into the feeding device 10.

[0039] The biomass raw materials in the feeding device 10 can be discharged from the first feeding outlet 12 and the second feeding outlet 13. The feeding device 10 can adjust the amount of biomass raw materials discharged from the first feeding outlet 12 and the amount of biomass raw materials discharged from the second feeding outlet 13. The first feeding outlet 12 is communicated with the inlet of the biomass boiler 1, and the second feeding outlet 13 is communicated with the inlet of the drying device 4. Specifically, the feeding device 10 can feed the crushed biomass raw materials into the silo of the biomass boiler 1 and the drying device 4. The feeding device 10 can respectively achieve 100% feeding into the silo of the biomass boiler 1 and the drying device 4 through the first feeding outlet 12 and the second feeding outlet 13, so as to feed according to the demand. For example, the feeding device 10 is an inclined belt conveyor.

[0040] As Figures 1 to 4 shown, in some embodiments, the biomass power plant coupled pyrolysis polygeneration peak shaving system further includes a desuperheating and pressure reducing device 8. The steam outlet of the biomass boiler 1 is communicated with the desuperheating and pressure reducing device 8. The desuperheating and pressure reducing device 8 is connected in parallel with the steam turbine 2. A first valve is provided at the inlet of the desuperheating and pressure reducing device 8. Specifically, the desuperheating and pressure reducing device 8 is equipped for the biomass boiler 1. The equipped desuperheating and pressure reducing device 8 and the steam turbine 2 are used as backup equipment for supplying heat and steam to the outside. Thus, when the temperature of the superheated steam generated in the biomass boiler 1 is too high and the amount is large, the first valve can be opened so that the superheated steam can be introduced into the desuperheating and pressure reducing device 8, thereby ensuring the safety of the system operation. For example, the desuperheating and pressure reducing device 8 includes a desuperheating and pressure reducing tank body, and water is contained in the desuperheating and pressure reducing tank body.

[0041] In some embodiments, the ratio of the amount of biomass raw materials consumed by the biomass boiler 1 per unit time to the amount of biomass raw materials consumed by the pyrolysis device 5 per unit time is (2 - 10):1. That is, the ratio of the ability of the biomass boiler 1 to process biomass raw materials to the ability of the pyrolysis device 5 to process biomass raw materials is (2 - 10):1. Specifically, the ability of a single pyrolysis device 5 to process biomass raw materials is weak, and the number of pyrolysis devices 5 can be increased to improve the overall ability of the pyrolysis device 5 to process biomass raw materials. The ratio of the number of pyrolysis devices 5 to the number of biomass boilers 1 is (1 - 4):1. For example, the ratio of the ability of the biomass boiler 1 to process biomass raw materials to the ability of the pyrolysis device 5 to process biomass raw materials is 5:1. The ratio of the number of pyrolysis devices 5 to the number of biomass boilers 1 is 2:1.

[0042] In some embodiments, the mass ratio of the moisture in the dried biomass raw materials to the mass of the dried biomass raw materials is (0.1 - 0.15):1. That is, the moisture in the biomass raw materials is dried to 10% to 15% of the total mass. For example, the mass ratio of the moisture in the dried biomass raw materials to the mass of the dried biomass raw materials is 0.12:1.

[0043] As Figure 2As shown, in some embodiments, the flue gas outlet of the biomass boiler 1 is communicated with the flue gas inlet of the drying device 4, so that the drying device 4 can utilize the heat in the flue gas discharged from the biomass boiler 1 to dry the biomass raw materials. Thus, the heat in the flue gas of the biomass boiler 1 can be recycled to reduce energy waste. For example, the flue gas outlet of the biomass boiler 1 is communicated with the flue gas inlet of the drying device 4 through the first connecting pipeline.

[0044] In some embodiments, the steam outlet of the biomass boiler 1 is communicated with the steam inlet of the drying device 4, so that the drying device 4 can utilize the heat in the steam discharged from the biomass boiler 1 to dry the biomass raw materials. That is, the drying device 4 can utilize the heat in the steam generated by the biomass boiler 1 to dry the biomass raw materials. For example, the steam outlet of the biomass boiler 1 is communicated with the steam inlet of the drying device 4 through the second connecting pipeline.

[0045] As Figure 4 shown, in some embodiments, at least one of the steam outlet of the desuperheater 8 and the steam outlet of the steam turbine 2 is communicated with the steam inlet of the drying device 4, so that the drying device 4 can utilize the heat in the steam discharged from at least one of the desuperheater 8 and the biomass boiler 1 to dry the biomass raw materials. Specifically, the steam outlets of the desuperheater 8 and the steam turbine 2 can both supply steam outward, and using this steam to dry the biomass raw materials can reduce energy waste. For example, the steam outlets of the desuperheater 8 and the steam turbine 2 are both communicated with the steam inlet of the drying device 4 through the third connecting pipeline.

[0046] As Figure 3 and Figure 4 shown, in some embodiments, the biomass power plant coupled pyrolysis polygeneration peak shaving system further includes an activation device 9, so that the pyrolysis carbon of the pyrolysis product can be used to produce activated carbon in the activation device 9. The activation of the pyrolysis carbon is produced intermittently, thus reducing resource waste. And the activation device 9 needs to consume steam, so the steam generated by the biomass boiler 1 can be consumed for peak shaving.

[0047] The steam inlet of the activation device 9 is communicated with the steam outlets of the desuperheater 8 and the steam turbine 2, so that the activation device 9 can convert the pyrolysis carbon into activated carbon by using the steam discharged from the desuperheater 8 and the steam turbine 2. When peak shaving and consuming steam are needed, the first valve can be opened so that the steam can pass through the desuperheater 8 into the activation device 9. The activation device 9 can consume the steam generated by the biomass boiler 1, thus reducing the power generation.

[0048] In some embodiments, the steam outlet of the biomass boiler 1 is communicated with the steam inlet of the activation device 4.

[0049] As Figures 1 to 4As shown, in some embodiments, the pressurizing device 6 has an ejector inlet 61. Specifically, the pressurizing device 6 is an ejector that uses gas pressure to eject gas. The ejector inlet 61 is used to introduce the ejector gas, and the pressure of the ejector gas is greater than or equal to the first preset value so that the ejector gas has sufficient energy to push the pyrolysis gas at high temperature. For example, the ejector gas is introduced into the pressurizing device 6 through a pipeline or a nozzle to be mixed with the pyrolysis gas to form a pyrolysis mixed gas, and the pyrolysis mixed gas is introduced into the biomass boiler 1 through a spray nozzle for combustion.

[0050] After the ejector gas is introduced into the pressurizing device 6 through the ejector inlet 61, the ejector gas is mixed with the pyrolysis gas in the pressurizing device 6 to form a pyrolysis mixed gas and introduced into the biomass boiler 1. At least one of the pressure and flow rate of the ejector gas introduced into the pressurizing device 6 can be controlled to control the flow rate of the pyrolysis mixed gas introduced into the biomass boiler 1. Specifically, increasing at least one of the pressure and flow rate of the ejector gas introduced into the pressurizing device 6 can increase the flow rate of the pyrolysis gas introduced into the biomass boiler 1; reducing the pressure and flow rate of the ejector gas introduced into the pressurizing device 6 can reduce the flow rate of the pyrolysis gas introduced into the biomass boiler 1; when the pressure of the ejector gas introduced into the pressurizing device 6 remains unchanged, reducing the flow rate of the ejector gas introduced into the pressurizing device 6 can reduce the flow rate of the pyrolysis gas introduced into the biomass boiler 1; when the flow rate of the ejector gas introduced into the pressurizing device 6 remains unchanged, reducing the pressure of the ejector gas introduced into the pressurizing device 6 can reduce the flow rate of the pyrolysis gas introduced into the biomass boiler 1.

[0051] As Figures 1 to 4 shown, in some embodiments, the biomass power plant coupled with pyrolysis polygeneration peak shaving system includes a gas mixing device 7. The outlet of the gas mixing device 7 is communicated with the ejector inlet. The gas mixing device 7 is used to mix multiple gases. The ejector gas includes combustible gas and non-combustible gas.

[0052] The combustible gas can be used as the ejector gas and introduced into the pressurizing device 6, that is, the combustible gas is used as the ejector gas so that the combustible gas is mixed with the pyrolysis gas and then introduced into the biomass boiler 1 for combustion.

[0053] The non-combustible gas can be used as the ejector gas and introduced into the pressurizing device 6, that is, the non-combustible gas is used as the ejector gas so that the non-combustible gas is mixed with the pyrolysis gas and then introduced into the biomass boiler 1 for combustion.

[0054] The combustible gas and the non-combustible gas can be mixed in the gas mixing device 7 according to a preset ratio and then used as the ejector gas and introduced into the pressurizing device 6, that is, the gas mixed according to the preset ratio is used as the ejector gas so that the mixed gas is mixed with the pyrolysis gas and then introduced into the biomass boiler 1 for combustion.

[0055] Thus, by controlling the ratio of combustible gas to non-combustible gas in the ejecting gas, the energy of the fuel fed into the biomass boiler 1 can be controlled, and by controlling at least one of the type, pressure, and flow rate of the ejecting gas, the power generation of the generator 2 can be adjusted. That is, both combustible gas and non-combustible gas can be used as the ejecting gas source and fed into the gas mixing device 7 for mixing. When the pressure and flow rate of the ejecting gas remain unchanged, by controlling the type of the ejecting gas (the type and ratio of combustible gas and non-combustible gas), the power generation of the generator 2 can be adjusted to perform peak shaving for the system.

[0056] Specifically, when the pressure and flow rate of the ejecting gas remain unchanged, increasing the ratio of combustible gas in the ejecting gas can increase the energy of the fuel fed into the biomass boiler 1, and thus increase the power generation. Decreasing the ratio of combustible gas in the ejecting gas can reduce the energy of the fuel fed into the biomass boiler 1, and thus reduce the power generation. That is to say, the system can be peak-shaved by adjusting the composition of the ejecting gas. For example, combustible gases include natural gas, liquefied petroleum gas, etc., and non-combustible gases include nitrogen, carbon dioxide, etc.

[0057] Thus, for the peak shaving method of daily small-scale heat load (about ±10%) fluctuations, the daily small-scale heat load fluctuations can be adjusted by the pressurizing device 6, that is, by changing at least one of the type, flow rate, and pressure of the ejecting gas source to adjust the energy of the mixed gas entering the biomass boiler 1 for peak shaving. When the pressure and flow rate of the ejecting gas remain unchanged, the method of adjusting the energy of the mixed gas entering the biomass boiler 1 by changing the type of the ejecting gas source is as follows:

[0058] During positive extreme adjustment, combustible gas can be used as the ejecting gas and fed into the pressurizing device 6. That is, the ejecting gas source can adopt high-calorific value gases such as natural gas and liquefied petroleum gas or their mixtures to increase the power generation.

[0059] During negative extreme adjustment, non-combustible gas can be used as the ejecting gas and fed into the pressurizing device 6. The ejecting gas source can adopt nitrogen, carbon dioxide, or their mixtures to reduce the power generation.

[0060] During intermediate stepless adjustment, combustible gas and non-combustible gas can be mixed in the gas mixing device 7 according to a preset ratio and then used as the ejecting gas and fed into the pressurizing device 6. The gas mixing device 7 can be used to achieve stepless mixing adjustment of high-calorific value gases such as natural gas or liquefied petroleum gas and inert gases such as nitrogen or carbon dioxide. This situation is more suitable for the positive peak shaving of heat load, that is, to meet the power generation and heat supply of the biomass direct combustion power plant. When the heat demand increases, it can not only ensure the increased heat supply demand but also by-product high-value pyrolysis carbon and activated carbon.

[0061] Adjustment method for a significant reduction (20%-30%) in external heat load at the monthly or quarterly level. In the case of a significant reduction in external heat load, to maintain the power generation demand determined by heat, the combined means of pyrolytic carbon activation (activation device 9) and pressurization device 6 can be used to ensure the efficient operation of power generation and boilers. That is, when the external heat load is significantly reduced, non-combustible gas can be used as the ejector gas to reduce the flow rate and pressure of the ejector gas. The activation device 9 can be started, that is, the required steam activation of pyrolytic carbon is used to consume the surplus steam determined by heat (0.2 tons - 0.8 tons of steam per ton of pyrolytic carbon), and the pressurization device 6 reduces the energy of the mixed gas entering the biomass boiler 1 so as to partially adjust and reduce the heat load.

[0062] In a specific embodiment: for a 1*30MW biomass cogeneration (biomass boiler 1, steam turbine 2, and generator 3) back-pressure unit coupled with 2*30,000 tons of biomass pyrolysis equipment (drying device 4, pyrolysis device 5, pressurization device 6, gas mixing device 7, and activation device 9). Before transformation, the cogeneration unit could annually consume about 160,000 tons of biomass raw materials, the biomass pyrolysis equipment could consume about 60,000 tons of biomass raw materials, annually produce about 20,000 tons of pyrolytic carbon, and produce 0.5 to 0.8 million tons of activated carbon. The pyrolysis equipment could annually produce 21 million Nm3 of pyrolysis gas, with an ejector gas consumption of 7.5 million Nm3. That is, at this time, the small-level load adjustment ability of ±12% could be achieved by changing the type of ejector gas. When the heat load is significantly reduced, the steam consumption for pyrolytic carbon activation is 12,000 to 16,000 tons. When the pyrolysis system operates continuously and the start-up rate of the activation system = the proportion of the annual time with a significant reduction in heat load is 20% to 40%, the active system (using the activation device 9) can ensure the heat supply peak shaving ability of -8.3% to -22.1%. That is, the combined means of pyrolytic carbon activation (using the activation device 9) and gas-driven pressurization device (using the pressurization device 6) can ensure the peak shaving ability of -33.1% to +12%.

[0063] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0064] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0065] In the present invention, unless otherwise clearly defined and limited, terms such as "mounted", "connected", "coupled", "fixed", etc. should be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be 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", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0067] In the present invention, terms such as "an embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0068] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present invention.

Claims

1. A biomass power plant coupled with pyrolysis polygeneration peak shaving system, characterized in that, it includes: a biomass boiler, a steam turbine and a generator. The inlet of the biomass boiler is used to introduce biomass raw materials, the steam outlet of the biomass boiler is communicated with the steam inlet of the steam turbine, and the steam turbine is connected to the generator and can drive the generator to generate electricity; a drying device, the inlet of the drying device is used to introduce biomass raw materials, and the drying device is used to dry biomass raw materials; a pyrolysis device, the inlet of the pyrolysis device is communicated with the outlet of the drying device, and the pyrolysis device is used to pyrolyze biomass raw materials into pyrolysis gas and pyrolysis carbon. The pyrolysis device has a first outlet and a second outlet. The first outlet is used to discharge pyrolysis gas, and the second outlet is used to discharge pyrolysis carbon; a pressurizing device, the inlet of the pressurizing device is communicated with the first outlet, and the outlet of the pressurizing device is communicated with the inlet of the biomass boiler. The pressurizing device can pressurize the pyrolysis gas and introduce it into the biomass boiler, and the pressurizing device can control the flow rate of the pyrolysis gas introduced into the biomass boiler so as to adjust the power generation of the generator.

2. The biomass power plant coupled with pyrolysis polygeneration peak shaving system according to claim 1, characterized in that, the pressurizing device has an ejector inlet for introducing an ejector gas, the pressure of the ejector gas is greater than or equal to a first preset value, and the ejector gas is mixed with the pyrolysis gas in the pressurizing device to form a pyrolysis mixed gas and introduced into the biomass boiler. At least one of the pressure and flow rate of the ejector gas introduced into the pressurizing device can be controlled to control the flow rate of the pyrolysis mixed gas introduced into the biomass boiler.

3. The biomass power plant coupled with pyrolysis polygeneration peak shaving system according to claim 2, characterized in that, the biomass power plant coupled with pyrolysis polygeneration peak shaving system includes a gas mixing device, and the outlet of the gas mixing device is communicated with the ejector inlet; the ejector gas includes a combustible gas and a non-combustible gas. The combustible gas can be used as the ejector gas and introduced into the pressurizing device, the non-combustible gas can be used as the ejector gas and introduced into the pressurizing device, and the combustible gas and the non-combustible gas can be mixed in the gas mixing device according to a preset ratio and then used as the ejector gas and introduced into the pressurizing device; the energy of the fuel introduced into the biomass boiler can be controlled by controlling the ratio of the combustible gas and the non-combustible gas in the ejector gas, and the power generation of the generator can be adjusted by controlling at least one of the type, pressure and flow rate of the ejector gas.

4. The biomass power plant coupled with pyrolysis polygeneration peak shaving system according to claim 1, characterized in that, the ratio of the amount of biomass raw materials consumed by the biomass boiler per unit time to the amount of biomass raw materials consumed by the pyrolysis device per unit time is (2-10):

1.

5. The biomass power plant coupled with pyrolysis polygeneration peak shaving system according to claim 1, characterized in that, the mass ratio of the moisture in the dried biomass raw materials to the mass of the dried biomass raw materials is (0.1-0.15):1; The flue gas outlet of the biomass boiler is connected to the flue gas inlet of the drying device, so that the drying device can use the heat in the flue gas discharged from the biomass boiler to dry the biomass raw materials; Alternatively, the steam outlet of the biomass boiler is connected to the steam inlet of the drying device, so that the drying device can use the heat in the steam discharged from the biomass boiler to dry the biomass raw materials.

6. The biomass power plant coupled pyrolysis polygeneration peak shaving system according to claim 1, characterized in that, it further includes a desuperheater and pressure reducer. The steam outlet of the biomass boiler is connected to the desuperheater and pressure reducer. The desuperheater and pressure reducer are connected in parallel with the steam turbine. A first valve is provided at the inlet of the desuperheater and pressure reducer.

7. The biomass power plant coupled pyrolysis polygeneration peak shaving system according to claim 6, characterized in that, at least one of the steam outlet of the desuperheater and pressure reducer and the steam outlet of the steam turbine is connected to the steam inlet of the drying device, so that the drying device can use the heat in the steam discharged from at least one of the desuperheater and pressure reducer and the biomass boiler to dry the biomass raw materials.

8. The biomass power plant coupled pyrolysis polygeneration peak shaving system according to claim 6, characterized in that, it further includes an activation device. The steam inlet of the activation device is connected to the steam outlet of the desuperheater and pressure reducer and the steam outlet of the steam turbine, so that the activation device can use the steam discharged from the desuperheater and pressure reducer and the steam turbine to convert the pyrolysis carbon into activated carbon.

9. The biomass power plant coupled pyrolysis polygeneration peak shaving system according to any one of claims 1-8, characterized in that, it includes a feeding device. The feeding device has a feeding inlet, a first feeding outlet and a second feeding outlet. The feeding inlet is used for introducing biomass raw materials. The biomass raw materials in the feeding device can be discharged from the first feeding outlet and the second feeding outlet. The feeding device can adjust the amount of biomass raw materials discharged from the first feeding outlet and the amount of biomass raw materials discharged from the second feeding outlet. The first feeding outlet is connected to the inlet of the biomass boiler, and the second feeding outlet is connected to the inlet of the drying device.

10. The biomass power plant coupled pyrolysis polygeneration peak shaving system according to claim 9, characterized in that, it includes a crushing device. The crushing device is used for crushing biomass raw materials. The crushing device is used for crushing biomass raw materials so that the particle size of the crushed biomass raw materials is less than or equal to 3 cm. The outlet of the crushing device is connected to the feeding inlet of the feeding device.

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