Biomass power plant coupling gasification poly-generation peak shaving system

Abstract

The biomass power plant coupling gasification 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 is communicated 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; the gasification device is used for gasifying the biomass raw material into gasified gas and gasified fly ash; an inlet of the separator is communicated with an outlet of the gasification device, the separator is provided with a first outlet and a second outlet, and the separator can separate gasified gas from gasified fly ash; and an outlet of the pressurizing device communicates with an inlet of the biomass boiler, and the pressurizing device can pressurize the gasified gas and then introduce the pressurized gasified gas into the biomass boiler. Therefore, the coupling gasification poly-generation peak regulation system for the biomass power plant has the advantages of high safety and convenience in peak regulation.

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 gasification 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 gasification, biomass esterification, biomass hydrolysis and fermentation, etc. Among them, the development of biomass gasification and biomass gasification technologies has attracted more attention, and biomass direct combustion power generation is the most mature.

[0003] The basic principle of biomass gasification power generation technology is to convert biomass into combustible gas (carbon monoxide, hydrogen, etc.), and then use the heat energy generated by the combustion of the combustible gas to be converted into electrical energy through power generation equipment. To a certain extent, it makes up for the disadvantage that biomass is difficult to burn due to its own characteristics. The technological process of biomass gasification power generation mainly includes the following steps: The processed biomass raw materials are sent to the gasification furnace through the feeding equipment or conveyor belt. Since the oxygen content is restricted by the volume of the furnace body, the biomass combustion occurs incompletely. At this time, the common process is to recover and preheat the gasification gas, that is, the high-temperature gas exchanges heat with the material to heat the biomass raw materials, and then the gas is filtered through the cooling system and purification device. The purified gas enters the steam turbine and internal combustion engine for power generation. In related technologies, there have been many engineering cases of directly coupling biomass gasification with large-scale thermal power generation, but the peak shaving is rather troublesome and a large amount of resources are wasted. 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 purpose, an embodiment of the present invention provides a biomass power plant coupled gasification polygeneration peak shaving system.

[0005] The biomass power plant coupled gasification 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, and the steam turbine is connected to the generator and can drive the generator to generate electricity;

[0007] A gasification device. The inlet of the gasification device is used to introduce biomass raw materials, and the gasification device is used to gasify the biomass raw materials into gasification gas and gasification fly ash;

[0008] A separator, the inlet of the separator is communicated with the outlet of the gasification device. The separator has a first outlet and a second outlet. The separator can separate the gasified gas and the gasified fly ash. The first outlet is used for discharging the gasified gas, and the second outlet is used for discharging the gasified fly ash;

[0009] 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 gasified gas and then introduce it into the biomass boiler. The pressurizing device can control the flow rate of the gasified gas introduced into the biomass boiler so as to adjust the power generation amount of the generator.

[0010] Therefore, the biomass power plant coupled gasification 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 gasified gas in the pressurizing device to form a gasified mixed gas and then introduced into the biomass boiler. At least one of the pressure and the flow rate of the ejector gas introduced into the pressurizing device can be controlled so as to control the flow rate of the gasified mixed gas introduced into the biomass boiler.

[0012] In some embodiments, the biomass power plant coupled gasification 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. 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 ratio of the combustible gas to the non-combustible gas in the ejector gas can be controlled to control the energy of the fuel introduced into the biomass boiler. 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 gasification device per unit time is (5 - 20):1.

[0016] The biomass power plant coupled gasification polygeneration peak shaving system according to the embodiment of the present invention further includes an activation device, and the activation device can convert the gasified fly ash into activated carbon.

[0017] The peak shaving system for biomass power plant coupled with gasification polygeneration according to the embodiment of the present invention further includes a desuperheater and pressure reducer. The steam outlet of the biomass boiler is communicated with the desuperheater and pressure reducer, the desuperheater and pressure reducer is connected in parallel with the steam turbine, and a first valve is provided at the inlet of the desuperheater and pressure reducer.

[0018] In some embodiments, the steam inlet of the activation device is communicated with 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 by the desuperheater and pressure reducer and the steam turbine to convert the gasified fly ash into activated carbon.

[0019] The peak shaving system for biomass power plant coupled with gasification polygeneration according to the embodiment of the present invention includes a flotation device. The inlet of the flotation device is communicated with the second outlet so that the gasified fly ash can be introduced into the flotation device. The flotation device can separate the gasified fly ash into flotation concentrate and flotation tailings. The carbon content of the flotation concentrate is greater than that of the flotation tailings, and the activation device can convert the flotation concentrate into activated carbon.

[0020] The peak shaving system for biomass power plant coupled with gasification polygeneration according to the embodiment of the present invention includes

[0021] a first crushing device for crushing biomass raw materials so that the particle size of the crushed biomass raw materials is less than or equal to 3 cm;

[0022] a second crushing device for crushing biomass raw materials so that the particle size of the crushed biomass raw materials is less than or equal to 1.5 cm. The outlet of the second crushing device is communicated with the inlet of the gasification device.

[0023] The peak shaving system for biomass power plant coupled with gasification polygeneration according to the 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 outlet and the amount of biomass raw materials discharged from the second outlet. The feeding inlet is communicated with the outlet of the first crushing device, the first feeding outlet is communicated with the inlet of the biomass boiler, and the second feeding outlet is communicated with the inlet of the second crushing device. Description of the Drawings

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

[0025] Figure 2Schematic diagram of a biomass power plant coupled with gasification polygeneration peak shaving system according to an embodiment of the present invention.

[0026] Figure 3 Schematic diagram of a gasification device and a separator according to an embodiment of the present invention.

[0027] Reference numerals: 1, biomass boiler; 2, steam turbine; 3, generator; 4, gasification device; 5, separator; 51, first outlet; 52, second outlet; 6, pressurization 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, flotation device; 15, first crushing device; 16, second crushing device. Detailed implementation manners

[0028] 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 a limitation to the present invention.

[0029] The biomass power plant coupled with gasification polygeneration peak shaving system according to an embodiment of the present invention will be described below with reference to the accompanying drawings. As Figures 1 to 3 shown, the biomass power plant coupled with gasification polygeneration peak shaving system according to an embodiment of the present invention includes a biomass boiler 1, a steam turbine 2, a generator 3, a gasification device 4, a separator 5 and a pressurization device 6.

[0030] 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.

[0031] The inlet of the gasification device 4 is used to introduce biomass raw materials. The gasification device 4 is used to gasify the biomass raw materials into gasified gas and gasified fly ash. The inlet of the separator 5 is communicated with the outlet of the gasification device 4. The separator 5 has a first outlet 51 and a second outlet 52. The separator 5 can separate the gasified gas and the gasified fly ash. The first outlet 51 is used to discharge the gasified gas, and the second outlet 52 is used to discharge the gasified fly ash. Specifically, the gasification device 4 includes a gasifier and a slag cooler (as Figure 3 shown). The gasifier adopts an atmospheric pressure circulating fluidized bed gasifier, and the temperature of the gasification dense phase zone is controlled at 800 °C to 950 °C. The gasification products are high-temperature gasified gas (800 °C to 850 °C) and gasified fly ash. The separator 5 is a cyclone separator, and the separator 5 can separate the gasified fly ash from the gasified gas.

[0032] The inlet of the supercharging device 6 is communicated with the first outlet 51, and the outlet of the supercharging device 6 is communicated with the inlet of the biomass boiler 1. The supercharging device 6 can supercharge the gasified gas and introduce it into the biomass boiler 1, so that the high-temperature gasified 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 supercharging device 6 and the gasification device 4, thereby increasing safety. Specifically, the flow rate and pressure of the supercharging device 6 are interlocked with the pressure of the gasification device 4, that is, the pressure of the gasification device 4 is regulated by the flow rate and pressure of the supercharging device 6.

[0033] The supercharging device 6 can control the flow rate of the gasified gas introduced into the biomass boiler 1 to adjust the power generation of the generator 3. Thus, when peak shaving of the system is required, the flow rate of the gasified gas that can be introduced into the biomass boiler 1 by controlling the supercharging 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 gasified gas introduced into the biomass boiler 1 by the supercharging device 6 is controlled to increase, so as to increase the energy of the fuel (gasified 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 gasified gas introduced into the biomass boiler 1 by the supercharging device 6 is controlled to decrease, so as to reduce the energy of the fuel (gasified gas) in the biomass boiler 1, and then it is convenient to reduce the power generation.

[0034] Therefore, the biomass power plant coupled gasification polygeneration peak shaving system according to the embodiment of the present invention has the advantages of high safety and convenient peak shaving.

[0035] As Figure 1 and Figure 2 shown, the biomass power plant coupled gasification polygeneration peak shaving system according to the embodiment of the present invention includes a first crushing device 15, a second crushing device 16 and a feeding device 10.

[0036] The first crushing device 15 is used for crushing biomass raw materials, and the first crushing device 15 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 second crushing device 16 is used for crushing biomass raw materials, and the second crushing device 16 is used for crushing biomass raw materials so that the particle size of the crushed biomass raw materials is less than or equal to 1.5 cm. The outlet of the second crushing device 16 is communicated with the inlet of the gasification device 4.

[0037] 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. 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 outlet 51 and the amount of biomass raw materials discharged from the second outlet 52. The feeding inlet 11 is communicated with the outlet of the first crushing device 15. The first feeding outlet 12 is communicated with the inlet of the biomass boiler 1. The second feeding outlet 13 is communicated with the inlet of the second crushing device 16.

[0038] Specifically, the first crushing device 15 performs coarse crushing on the biomass raw materials to reduce the particle size of the biomass raw materials. The biomass raw materials after the first crushing can be respectively transported by the feeding device 10 into the second crushing device 16 and the biomass boiler 1. The feeding device 10 can respectively achieve 100% feeding into the silo of the biomass boiler 1 and the gasification device 4 through the first feeding outlet 12 and the second feeding outlet 13 for feeding according to requirements. The second crushing device 16 can perform fine crushing on the coarsely crushed biomass raw materials so that the biomass raw materials after fine crushing can be introduced into the gasification device 4 for gasification. For example, the feeding device 10 is an inclined belt conveyor. The second crushing device 16 is used to crush the biomass raw materials so that the particle size of the crushed biomass raw materials is (roughly) 1 cm.

[0039] As Figure 1 and Figure 2 As shown, in some embodiments, the biomass power plant coupled gasification polygeneration peak shaving system according to the embodiment of the present invention 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, a 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 devices for supplying heat and steam to each other. 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.

[0040] In some embodiments, the ratio of the amount of biomass raw material consumed by the biomass boiler 1 per unit time to the amount of biomass raw material consumed by the gasification device 4 per unit time is (5 - 20):1. That is, the ratio of the ability of the biomass boiler 1 to process biomass raw materials to the ability of the gasification device 4 to process biomass raw materials is (5 - 20):1. Specifically, the ability of a single gasification device 4 to process biomass raw materials is weak, and the number of gasification devices 4 can be increased to improve the overall ability of the gasification device 4 to process biomass raw materials. The ratio of the number of gasification devices 4 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 gasification device 4 to process biomass raw materials is 10:1. The ratio of the number of gasification devices 4 to the number of biomass boilers 1 is 3:1.

[0041] As Figure 1 and Figure 2 shown, in some embodiments, the biomass power plant coupled gasification polygeneration peak shaving system further includes an activation device 9, and the activation device 9 can convert gasification fly ash into activated carbon. Thus, the gasification fly ash of the gasification product can be used to produce activated carbon in the activation device 9, and the activation of the gasification fly ash is carried out intermittently, thereby reducing resource waste.

[0042] In some embodiments, the steam inlet of the activation device 9 is connected to the steam outlet of the desuperheating and pressure reducing device 8 and the steam outlet of the steam turbine 2, so that the activation device 9 can use the steam discharged from the desuperheating and pressure reducing device 8 and the steam turbine 2 to convert the gasification fly ash into activated carbon. The activation device 9 needs to consume steam, and the activation device 9 can consume the steam generated by the biomass boiler 1 for peak shaving.

[0043] As Figure 2 shown, in some embodiments, the biomass power plant coupled gasification polygeneration peak shaving system includes a flotation device 14. The inlet of the flotation device 14 is connected to the second outlet 52 so that the gasification fly ash can be introduced into the flotation device 14. The flotation device 14 can separate the gasification fly ash into flotation concentrate and flotation tailings. The carbon content of the flotation concentrate (the mass of carbon element contained in the average unit mass) is greater than that of the flotation tailings. The activation device 9 can convert the flotation concentrate into activated carbon. Specifically, the flotation device 14 can effectively separate the high-carbon fly ash (flotation concentrate) and low-carbon fly ash (flotation tailings) in the gasification fly ash. The flotation concentrate enters the activation device 9 to ensure the quality of the activated carbon. The flotation tailings can be connected to the biomass boiler 1 for combustion or used as a carbon-based slow-release fertilizer.

[0044] Based on the physical and chemical properties of the gasification fly ash (the gasification fly ash is severely oxidized, loose and porous, and its hydrophobicity deteriorates), the main process parameters of the flotation device 14 are controlled as follows: The collector can be selected from amphoteric collectors (alkyl amino carboxylic acid, N-acyl amino carboxylic acid) and hydrocarbon collectors (kerosene, diesel oil, fuel oil, light wax oil). The frother can be selected from pine oil, cresylic acid oil, terpineol (No. 2 flotation oil), isobutyl methyl carbinol, methyl amyl alcohol, sodium alkyl benzene sulfonate, sodium alkyl sulfate, sec-octanol, etc. For example, the collector is selected as kerosene or diesel oil from the hydrocarbon collectors, and the concentration of the collector is 4 kg - 15 kg / t (gasification fly ash); the frother is selected as sec-octanol, and the concentration of the frother is 2 kg - 8 kg / t (gasification fly ash); the pulp concentration is controlled at 40 g / L - 100 g / L.

[0045] As Figure 1 and Figure 2 shown, in some embodiments, the pressurizing device 6 has an ejector inlet 61. Specifically, the pressurizing device 6 is an ejector that ejects gas by using gas pressure.

[0046] 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 high-temperature gasification gas. For example, the ejector gas is introduced into the pressurizing device 6 through a pipeline or a nozzle and mixed with the gasification gas to form a gasification mixed gas, and the gasification mixed gas is introduced into the biomass boiler 1 through a spray nozzle for combustion.

[0047] After the ejector gas is introduced into the pressurizing device 6 through the ejector inlet 61, the ejector gas is mixed with the gasification gas in the pressurizing device 6 and then forms a gasification mixed gas and is 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 gasification 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 gasification 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 gasification 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 gasification 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 gasification gas introduced into the biomass boiler 1.

[0048] As Figure 1 and Figure 2 shown, in some embodiments, the biomass power plant coupled gasification polygeneration peak shaving system includes a gas mixing device 7. The outlet of the gas mixing device 7 is communicated with the ejector inlet 61, and the gas mixing device 7 is used to mix multiple gases. The ejector gas includes combustible gas and non-combustible gas.

[0049] The combustible gas can be introduced into the pressurizing device 6 as the entraining gas, that is, the combustible gas is used as the entraining gas so that the combustible gas and the gasified gas are mixed and then introduced into the biomass boiler 1 for combustion.

[0050] The non-combustible gas can be introduced into the pressurizing device 6 as the entraining gas, that is, the non-combustible gas is used as the entraining gas so that the non-combustible gas and the gasified gas are mixed and then introduced into the biomass boiler 1 for combustion.

[0051] The combustible gas and the non-combustible gas can be mixed in the gas mixing device 7 according to a preset ratio and then introduced into the pressurizing device 6 as the entraining gas, that is, the gas mixed according to the preset ratio is used as the entraining gas so that the mixed gas and the gasified gas are mixed and then introduced into the biomass boiler 1 for combustion.

[0052] The energy of the fuel introduced into the biomass boiler 1 can be controlled by controlling the ratio of the combustible gas and the non-combustible gas in the entraining gas, and the power generation of the generator 3 can be adjusted by controlling at least one of the type, pressure and flow rate of the entraining gas. That is, both the combustible gas and the non-combustible gas can be introduced into the gas mixing device 7 as the entraining gas source for mixing. When the pressure and flow rate of the entraining gas remain unchanged, by controlling the type of the entraining gas (the type and ratio of the combustible gas and the non-combustible gas), the power generation of the generator 2 can be adjusted so as to perform peak shaving on the system.

[0053] Specifically, when the pressure and flow rate of the entraining gas remain unchanged, increasing the ratio of the combustible gas in the entraining gas can increase the energy of the fuel introduced into the biomass boiler 1, and thus increase the power generation. Decreasing the ratio of the combustible gas in the entraining gas can decrease the energy of the fuel introduced into the biomass boiler 1, and thus decrease the power generation. That is to say, the system can be peak-shaved by adjusting the composition of the entraining gas. For example, the combustible gas includes natural gas, liquefied petroleum gas, etc., and the non-combustible gas includes nitrogen, carbon dioxide, etc.

[0054] When peak shaving with the fluctuation of the heat load (about ±20%), the fluctuation of the heat load can be adjusted by the pressurizing device 6, that is, by changing at least one of the type, flow rate and pressure of the entraining gas source to adjust the energy of the mixed gas entering the biomass boiler 1 so as to perform peak shaving. When the pressure and flow rate of the entraining gas remain unchanged, the method of adjusting the energy of the mixed gas entering the biomass boiler 1 by changing the type of the entraining gas source is as follows:

[0055] During positive extreme adjustment, the combustible gas can be introduced into the pressurizing device 6 as the entraining gas. That is, the entraining gas source can adopt high-calorific value gases such as natural gas and liquefied petroleum gas or their mixtures to increase the power generation.

[0056] During negative extreme regulation, non-combustible gas can be introduced into the pressurization device 6 as the entraining gas. Nitrogen or carbon dioxide or their mixture can be used as the entraining gas source to reduce the power generation.

[0057] During intermediate stepless regulation, combustible gas and non-combustible gas can be mixed in the gas mixing device 7 according to a preset ratio and then introduced into the pressurization device 6 as the entraining gas. Through the gas mixing device 7, stepless mixing regulation of high-calorific value gas such as natural gas or liquefied petroleum gas and inert gas such as nitrogen or carbon dioxide can be achieved. 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-added gasified carbon and activated carbon.

[0058] The biomass power plant coupled gasification polygeneration peak shaving system can meet the heat supply peak shaving capacity of -20% to +20%. At the same time, during the load reduction process, to meet the requirements of heat-based power generation (back-pressure units, extraction-back-pressure units) and the load change requirements of extraction-condensing units, the surplus steam is used for the activation of gasification fly ash, and high-value-added activated carbon can be produced.

[0059] In a specific embodiment: for a 1*30MW biomass thermoelectric (biomass boiler 1, steam turbine 2 and generator 3) co-generation back-pressure unit coupled with a 10,000-ton biomass gasification equipment (gasification device 4, separator 5, pressurization device 6, gas mixing device 7 and activation device 9), before transformation, the thermoelectric co-generation unit can annually consume about 160,000 tons of biomass raw materials, the biomass gasification equipment (gasification device 4) can consume about 10,000 tons of biomass raw materials, the cyclone separator (separator 5) can annually capture about 900 tons of gasification fly ash, and produce 700-900 tons of activated carbon. That is, when the external heat load decreases, the gasification fly ash activation system (activation device 9) can be intermittently started, that is, the surplus heat-based power generation steam is consumed by the steam activation of gasification fly ash (0.2-0.5 tons of steam per ton of gasification fly ash).

[0060] The gasification device 4 can annually produce about 30 million Nm3 of gasified gas, and the annual consumption of the entraining gas is 10.8 million Nm3. That is, at this time, the load regulation capacity of ±17.8% can be achieved by changing the type of entraining gas, etc. (non-combustible gas can be used as the entraining gas to reduce the flow rate and pressure of the entraining gas). The steam consumption for gasification fly ash activation is 180-450 tons, which can be used as a fine-tuning means for load regulation. When the gasification system operates continuously and the start-up rate of the activation system = the proportion of the time when the annual heat load is greatly reduced is 20%-40%, the activation system (using the activation device 9) can only ensure that the heat supply peak shaving capacity is -0.1% to -0.6%. That is, the combination of gasification fly ash carbon activation (using the activation device 9) and gas drive pressurization device (using the pressurization device 6) can ensure the peak shaving capacity of -18.4% to +17.8%.

[0061] 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 thus should not be construed as a limitation on the present invention.

[0062] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0063] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood 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.

[0064] In the present invention, unless otherwise clearly specified and defined, 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.

[0065] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, 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.

[0066] 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, and that changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the scope of protection of the present invention.

Claims

1. A biomass power plant coupled with gasification 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. The steam turbine is connected to the generator and can drive the generator to generate electricity; a gasification device. The inlet of the gasification device is used to introduce biomass raw materials. The gasification device is used to gasify biomass raw materials into gasified gas and gasified fly ash; a separator. The inlet of the separator is communicated with the outlet of the gasification device. The separator has a first outlet and a second outlet. The separator can separate the gasified gas and the gasified fly ash. The first outlet is used to discharge the gasified gas, and the second outlet is used to discharge the gasified fly ash; a pressurization device. The inlet of the pressurization device is communicated with the first outlet. The outlet of the pressurization device is communicated with the inlet of the biomass boiler. The pressurization device can pressurize the gasified gas and then introduce it into the biomass boiler. The pressurization device can control the flow rate of the gasified gas introduced into the biomass boiler so as to adjust the power generation amount of the generator.

2. The biomass power plant coupled with gasification polygeneration peak shaving system according to claim 1, characterized in that, the pressurization 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 gasified gas in the pressurization device to form a gasified mixed gas and then introduced into the biomass boiler. At least one of the pressure and flow rate of the ejector gas introduced into the pressurization device can be controlled so as to control the flow rate of the gasified mixed gas introduced into the biomass boiler.

3. The biomass power plant coupled with gasification polygeneration peak shaving system according to claim 2, characterized in that, the biomass power plant coupled with gasification polygeneration peak shaving system includes a gas mixing device. 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 pressurization device. The non-combustible gas can be used as the ejector gas and introduced into the pressurization device. 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 pressurization 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 amount 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 gasification 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 gasification device per unit time is (5 - 20):

1.

5. The biomass power plant coupled with gasification polygeneration peak shaving system according to any one of claims 1 - 4, characterized in that, it further includes an activation device, and the activation device can convert the gasified fly ash into activated carbon.

6. The biomass power plant coupled gasification poly-generation peak shaving system according to claim 5, characterized in that, it further includes a desuperheater and pressure reducer. The steam outlet of the biomass boiler is communicated with 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.

7. The biomass power plant coupled gasification poly-generation peak shaving system according to claim 6, characterized in that, the steam inlet of the activation device is communicated with 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 gasified fly ash into activated carbon.

8. The biomass power plant coupled gasification poly-generation peak shaving system according to claim 5, characterized in that, it includes a flotation device. The inlet of the flotation device is communicated with the second outlet so that the gasified fly ash can be introduced into the flotation device. The flotation device can separate the gasified fly ash into flotation concentrate and flotation tailings. The carbon content of the flotation concentrate is greater than that of the flotation tailings. The activation device can convert the flotation concentrate into activated carbon.

9. The biomass power plant coupled gasification poly-generation peak shaving system according to claim 1, characterized in that, it includes a first crushing device for crushing biomass raw materials, and the first crushing device is used to crush biomass raw materials so that the particle size of the crushed biomass raw materials is less than or equal to 3 cm; a second crushing device for crushing biomass raw materials, and the second crushing device is used to crush biomass raw materials so that the particle size of the crushed biomass raw materials is less than or equal to 1.5 cm. The outlet of the second crushing device is communicated with the inlet of the gasification device.

10. The biomass power plant coupled gasification poly-generation peak shaving system according to claim 9, characterized in that, it includes a feeding device with a feeding inlet, a first feeding outlet and a second feeding outlet. The feeding inlet is used to introduce 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 outlet and the amount of biomass raw materials discharged from the second outlet. The feeding inlet is communicated with the outlet of the first crushing device. The first feeding outlet is communicated with the inlet of the biomass boiler. The second feeding outlet is communicated with the inlet of the second crushing device.

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