Coupling carbon reduction method for planting and utilizing energy plants in pit of pithead coal power plant

Abstract

The invention provides a coupling carbon reduction method for pit energy plant planting and utilization of a pithead coal power plant, which mainly utilizes a pithead large-scale pit to plant water energy crops, and the water energy crops absorb carbon dioxide discharged by the coal power plant to perform photosynthesis and form raw materials of biomass fuel. After being processed and treated, the biomass fuel is used for replacing part of coal fuel by blending combustion in a pithead coal power plant, and carbon emission of the pithead coal power plant is reduced from two aspects of fossil fuel consumption and flue gas carbon dioxide absorption to realize low-carbon transformation; in addition, waste large pits are effectively utilized for water energy plant planting, and soil remediation and ecological management of the pits are facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of smoke utilization in coal-fired power plants, and in particular to a method for coupling carbon reduction by planting and utilizing energy plants in a mine pit of a pit-mouth coal-fired power plant. Background Art

[0002] Energy supply is an important material guarantee for social progress and economic growth. Fossil fuels are non-renewable energy sources, and their increasing consumption has caused severe energy shortages on the one hand, and serious environmental pollution and climate change on the other, threatening social development and human survival. Therefore, large-scale and high-proportion development of zero-carbon energy is an inevitable trend.

[0003] Wind, solar, hydro, nuclear and biomass power generation are all low-carbon energy sources. Biomass raw materials have the characteristics of large volume, low density, high moisture content, and obvious seasonal and regional differences. Their inherent characteristics lead to a significant increase in the cost of raw material transportation and storage, which greatly limits the large-scale utilization and promotion of biomass energy. There is a large development space and opportunity for further research and development and breakthroughs in biomass utilization technology, coal-fired power carbon reduction and biomass energy utilization.

[0004] 1. Coal-fired power units face great pressure to reduce carbon emissions

[0005] There are three main technical paths for low-carbon transformation of coal-fired power units: co-firing of biomass, co-firing of green ammonia, and carbon capture and storage. However, all of them face great challenges in transformation investment and operating costs.

[0006] 2. Blending biomass makes it difficult to stabilize the supply and price control of biomass raw materials

[0007] The inherent characteristics of biomass, such as large volume, low density, high moisture content, and large seasonal and regional differences, have led to a significant increase in the cost of raw material transportation and storage. Biomass raw material quality control, stable raw material supply and raw material prices have always been difficult problems restricting the development of the industry; biomass direct combustion power generation still has a large risk of losses.

[0008] 3. Blending with green ammonia is not economical in the short to medium term

[0009] By utilizing surplus electricity from renewable energy sources such as wind power and solar power generation, producing green hydrogen and synthesizing green ammonia through water electrolysis, and implementing coal-fired units to burn green ammonia for power generation, part of the coal can be replaced. Green ammonia is obtained through a synthesis process of green hydrogen produced by water electrolysis and nitrogen captured by an air separation unit. The cost of green ammonia mainly depends on the cost of green hydrogen, which accounts for 80%-90% of the ammonia production cost. The other two important steps in ammonia production are nitrogen separation and purification and related synthesis processes, which only account for a small part of the current total cost structure. When ammonia is used as a fuel for coal-fired ammonia-blended power generation, the calorific value of a ton of ammonia corresponds to a standard coal amount of about 0.64t, and carbon emissions are 1.65t. When the green electricity price is 0.1 yuan / kWh, the total cost of green ammonia is 2275 yuan / t (taking tax into account). Only when the standard coal price reaches 2500 yuan / t and the carbon price is 500 yuan / t, the sum of the standard coal price and carbon price corresponding to the calorific value of a ton of ammonia is 2414 yuan / t; therefore, coal-to-ammonia blending is not yet economically competitive in the short term.

[0010] 4. The operation cost of carbon capture and storage technology is high

[0011] Chemical, adsorption, membrane and other technologies are used to separate and capture carbon dioxide from coal-fired boiler flue gas, and carbon dioxide is regenerated and purified and compressed by pressure and temperature regulation; geological utilization technologies such as carbon dioxide efficient oil recovery and chemical utilization technologies such as carbon dioxide hydrogenation to methanol (CCUS) are promoted and applied. The emission reduction cost of CCUS technology is relatively high, and its competitive advantage over other technologies is not obvious, which restricts the promotion and application of CCUS technology. The high cost of installing and operating CCUS puts great pressure on the power industry. The cost of carbon capture is as high as 200 to 600 yuan per ton of CO2. The power generation efficiency of coal-fired power plants equipped with CCUS facilities will be reduced by 20 to 30%, and the power generation cost will increase by about 60%.

[0012] 5. Mine water is seriously polluted and difficult to use

[0013] After the closure of a coal mine, production and drainage of the mine pit will stop. During the groundwater filling process, abandoned tunnels, shafts and goafs will be submerged. In addition to pollutants such as lubricating oil and hydraulic oil left over from mining activities, harmful substances in the mining area, coal-bearing strata and adjacent aquifers will also enter the groundwater system, making the mine water a potential source of pollution. At the same time, mine water can also cause groundwater pollution through faults, fissures, collapse columns and poorly sealed boreholes, or overflow to the surface to cause surface water pollution, which has attracted widespread attention from the society. Usually, mine water has the characteristics of high acidity, high mineralization, high sulfate and iron and manganese heavy metals, which makes environmental remediation difficult and the treatment cost high.

[0014] Therefore, it is of great significance to develop a technology for coupling carbon reduction by planting energy plants in mine pits of coal-fired power plants, reduce the consumption of coal and other fossil fuels by pit-mouth coal-fired power plants, and carry out ecological restoration of mine pits. Summary of the invention

[0015] In view of the problems existing in the prior art, the present invention provides a method for coupled carbon reduction by planting and utilizing mine energy plants in a pit-mouth coal-fired power plant. Water energy plants are planted in the mine of the pit-mouth coal-fired power plant, and the carbon dioxide emitted by the pit-mouth coal-fired power plant is absorbed by photosynthesis of the water energy plants. The water energy plants are then blended as biofuels to achieve soil restoration and ecological management of the mine, while achieving dual carbon reduction at both the input and emission ends of the coal-fired power plant, supporting the low-carbon transformation of the coal-fired power plant.

[0016] To achieve this object, the present invention adopts the following technical solutions:

[0017] The present invention provides a method for coupling carbon reduction by planting and utilizing energy plants in a mine pit of a pit-mouth coal-fired power plant, the method comprising the following steps:

[0018] (1) The flue gas generated by the thermal unit of the pit-mouth coal-fired power plant enters the flue gas distribution unit, and the flue gas is sent to the water body energy plant planting unit according to the demand for carbon dioxide in the water body energy plant planting unit, and the remaining flue gas is discharged through the chimney;

[0019] (2) Photosynthesis is carried out in the water energy plant planting unit to harvest biomass raw materials;

[0020] (3) The biomass raw material is processed in a biofuel processing unit according to the requirements of the thermal unit of the mine-mouth coal-fired power plant for the blended fuel to obtain biofuel;

[0021] (4) The biofuel is fed into the thermal unit of the mine-mouth coal-fired power plant and burned together with coal to achieve carbon reduction.

[0022] The pit-mouth coal-fired power plant mine pit energy plant planting method described in the present invention utilizes the coupled carbon reduction method to use the flue gas generated by the thermal unit of the pit-mouth coal-fired power plant for the planting of water body energy plants, and absorbs the carbon dioxide emitted by the combustion of fossil fuels through the photosynthesis of the energy plants; the harvested energy crops can be used as biomass fuel for blending and burning in the thermal unit of the pit-mouth coal-fired power plant, thereby greatly reducing the consumption of fossil fuels by the thermal unit of the pit-mouth coal-fired power plant.

[0023] The method described in the present invention couples the pit-mouth coal power plant with the planting of water energy plants. On the one hand, the water energy plants absorb the carbon dioxide emitted by the coal power plant to achieve emission reduction. On the other hand, they can also be used as biofuel to replace coal, reducing the carbon dioxide emission source per kilowatt-hour of electricity from the coal power plant from the source. The method is suitable for the low-carbon transformation of pit-mouth coal power plants.

[0024] The method described in the present invention is also applicable to coal power plants, oil, gas and other thermal power plants with carbon emissions, and only requires the installation of devices that are suitable for the growth of water energy plants.

[0025] Preferably, the flue gas distribution unit in step (1) comprises a flue gas volume regulating device or a carbon dioxide capture device.

[0026] Preferably, in step (1), before the flue gas enters the water body energy plant planting unit, it is adjusted according to the temperature and flow requirements of the water body energy plant planting unit.

[0027] Preferably, the water energy plant planting unit in step (2) includes a mine pit.

[0028] Preferably, the water environment conditions in the water energy plant planting unit are: pH value is not less than 2.5, for example, it can be 2.51, 2.55, 2.6, 3, 5 or 7, but it is not limited to the listed values, and other values ​​not listed in the range are also applicable;

[0029] The mineralization TDS is not greater than 20000 mg / L, for example, it can be 19999 mg / L, 19000 mg / L, 18000 mg / L, 15000 mg / L, 13000 mg / L or 10000 mg / L, but it is not limited to the listed values, and other values ​​not listed in the numerical range are also applicable;

[0030] The sulfate ion concentration is not higher than 4500 mg / L, for example, it can be 4499 mg / L, 4400 mg / L, 4200 mg / L, 4000 mg / L, 3500 mg / L or 3000 mg / L, but it is not limited to the listed values, and other values ​​not listed in the numerical range are also applicable;

[0031] The mass concentration of Fe element is not higher than 600 mg / L, for example, it can be 599 mg / L, 590 mg / L, 570 mg / L, 550 mg / L, 500 mg / L or 400 mg / L, but it is not limited to the listed values, and other values ​​not listed in the numerical range are also applicable;

[0032] The mass concentration of Mn element is not higher than 45 mg / L, for example, it can be 44 mg / L, 40 mg / L, 35 mg / L, 30 mg / L, 25 mg / L or 20 mg / L, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0033] Preferably, algae are planted in the water energy plant planting unit in step (2).

[0034] Preferably, the water surface of the water energy plant planting unit is planted with Chlamydomonas species of the Chlorophyta, which are resistant to acidity and high inorganic salt ion environments; and black algae and brown algae are planted in the water.

[0035] Preferably, the temperature of the water environment in the water energy plant planting unit in step (2) is 20-30°C, for example, it can be 20°C, 22°C, 25°C, 27°C, 29°C or 30°C, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable; preferably it is 20-25°C.

[0036] Preferably, the heat required by the water energy plant planting unit is supplied by the waste heat of the thermal unit of the pit mouth coal power plant, ensuring a suitable temperature for the growth of algae and accelerating carbon fixation.

[0037] Preferably, the light intensity of the water energy plant planting unit in step (2) is 5000-15000 lx, for example, it can be 5000lx, 8000lx, 9000lx, 10000lx, 12000lx, 14000lx or 15000lx, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0038] Preferably, the carbon dioxide concentration of the water energy plant planting unit in step (2) is 10,000 to 30,000 ppm, for example, it can be 10,000 ppm, 12,000 ppm, 15,000 ppm, 20,000 ppm, 25,000 ppm or 30,000 ppm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0039] The present invention controls the temperature of the water environment in the water energy plant planting unit to 20-30°C, the light intensity to 5000-15000lx, and the carbon dioxide concentration to 10000-30000ppm, so that the water energy plants are at a better photosynthesis intensity, the carbon dioxide absorption efficiency is improved, and rapid growth is promoted.

[0040] Preferably, the requirements of the thermal unit of the pit-mouth coal-fired power plant for the blended fuel in step (3) include the moisture content and particle size of the blended fuel.

[0041] Preferably, the heat required by the biofuel processing unit is supplied by the waste heat of the thermal unit of the pit mouth coal power plant, and is mainly used for drying the energy planted biomass, which is conducive to the subsequent stable co-combustion of coal-fired electricity.

[0042] As a preferred technical solution of the present invention, the method comprises the following steps:

[0043] (1) The flue gas generated by the thermal unit of the pit-mouth coal-fired power plant enters the flue gas distribution unit, and the flue gas is sent to the water body energy plant planting unit according to the demand for carbon dioxide in the water body energy plant planting unit, and the remaining flue gas is discharged through the chimney; the flue gas distribution unit includes a flue gas volume regulating device or a carbon dioxide capture device; before the flue gas enters the water body energy plant planting unit, it is regulated according to the temperature and flow requirements of the water body energy plant planting unit;

[0044] (2) Photosynthesis is carried out in the water energy plant planting unit to harvest biomass raw materials;

[0045] The water body energy plant planting unit includes a mine pit; the water environment conditions in the water body energy plant planting unit are: pH value not less than 2.5, mineralization TDS not more than 20000mg / L, sulfate ion concentration not higher than 4500mg / L, Fe element mass concentration not higher than 600mg / L, Mn element mass concentration not higher than 45mg / L; algae are planted in the water body energy plant planting unit; Chlamydomonas of the water body energy plant planting unit is planted on the water surface, and black algae and brown algae are planted in the water;

[0046] The temperature of the water environment in the water energy plant planting unit is 20-30°C; the heat required by the water energy plant planting unit is supplied by the waste heat of the thermal unit of the pit mouth coal power plant; the light intensity of the water energy plant planting unit is 5000-15000lx; the carbon dioxide concentration of the water energy plant planting unit is 10000-30000ppm;

[0047] (3) The biomass raw material is processed in a biofuel processing unit according to the requirements of the thermal unit of the pit-mouth coal-fired power plant for the moisture content and particle size of the blended fuel to obtain biofuel; the heat required by the biofuel processing unit is supplied by the waste heat of the thermal unit of the pit-mouth coal-fired power plant;

[0048] (4) The biofuel is fed into the thermal unit of the mine-mouth coal-fired power plant and burned together with coal to achieve carbon reduction.

[0049] Compared with the prior art, the present invention has at least the following beneficial effects:

[0050] (1) The method of coupling carbon reduction by planting energy plants in the pit of a pit-mouth coal-fired power plant provided by the present invention is to couple the planting of energy plants in water bodies with the planting of energy plants in the pit-mouth coal-fired power plant, utilize the energy plants in water bodies to absorb and fix carbon, and produce biofuel to replace coal fuel for carbon reduction, thereby achieving the low-carbonization goal of the pit-mouth coal-fired power plant.

[0051] (2) The method of coupled carbon reduction for planting energy plants in mine pits of coal-fired power plants provided by the present invention can utilize abandoned large coal pits for planting water energy plants, thereby improving the ecological environment of the mine pits and avoiding water pollution caused by the mine pits. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a schematic diagram of the device system used in the method of coupled carbon reduction by planting energy plants in a pit-mouth coal-fired power plant in a specific implementation manner of the present invention.

[0053] In the figure: 1- thermal unit of the mine mouth coal power plant; 2- flue gas distribution unit; 3- water energy plant planting unit; 4- biofuel processing unit; 5- chimney. DETAILED DESCRIPTION

[0054] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0055] The present invention is further described in detail below. However, the following examples are only simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

[0056] It should be understood that, in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are 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 cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0057] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0058] Those skilled in the art should understand that the present invention necessarily includes necessary pipelines, conventional valves and general pump equipment for realizing a complete process, but the above content does not belong to the main inventive point of the present invention. Those skilled in the art can add layouts on their own based on the process flow and equipment structure selection, and the present invention does not make special requirements and specific limitations on this.

[0059] As a specific embodiment of the present invention, a method for coupling carbon reduction by planting energy plants in a mine pit of a coal-fired power plant is provided. The schematic diagram of the device system used is as follows: Figure 1 shown.

[0060] The device system comprises a pit-mouth coal power plant thermal unit 1, a flue gas distribution unit 2, a water body energy plant planting unit 3 and a biofuel processing unit 4 which are connected in sequence;

[0061] The flue gas distribution unit 2 is connected to the chimney 5;

[0062] The thermal unit 1 of the pit-mouth coal-fired power plant is connected to the water energy plant planting unit 3 via a first waste heat transmission pipeline; the thermal unit 1 of the pit-mouth coal-fired power plant is connected to the biofuel processing unit 4 via a second waste heat transmission pipeline.

[0063] The biofuel processing unit 4 is connected to the thermal unit 1 of the pit-mouth coal-fired power plant; the thermal unit 1 of the pit-mouth coal-fired power plant is connected to the coal transportation pipeline.

[0064] The method comprises the following steps:

[0065] (1) The flue gas generated by the thermal unit 1 of the pit-mouth coal-fired power plant enters the flue gas distribution unit 2, and the flue gas is sent to the water body energy plant planting unit 3 according to the demand for carbon dioxide in the water body energy plant planting unit 3, and the remaining flue gas is discharged through the chimney 5; the flue gas distribution unit 2 is a flue gas volume regulating device; before the flue gas enters the water body energy plant planting unit 3, it is regulated according to the temperature and flow requirements of the water body energy plant planting unit 3;

[0066] (2) Photosynthesis is carried out in the water energy plant planting unit 3 to harvest biomass raw materials;

[0067] The water body energy plant planting unit 3 is a mine pit; the water environment conditions in the water body energy plant planting unit 3 are: pH value is 3, mineralization TDS is 19000mg / L, sulfate ion concentration is 4200mg / L, Fe element mass concentration is 500mg / L, Mn element mass concentration is 40mg / L; algae are planted in the water body energy plant planting unit; Chlamydomonas of the phylum Chlamydomonas is planted on the water surface of the water body energy plant planting unit 3, and black algae and brown algae are planted in the water;

[0068] The temperature of the water environment in the water energy plant planting unit 3 is 23°C; the heat required by the water energy plant planting unit 3 is supplied by the waste heat of the thermal unit of the pit mouth coal power plant; the light intensity of the water energy plant planting unit 3 is 10000lx, and the carbon dioxide concentration is 20000ppm;

[0069] (3) The biomass raw material is processed in the biofuel processing unit 4 according to the requirements of the thermal unit 1 of the pit-mouth coal-fired power plant on the moisture content and particle size of the mixed fuel to obtain biofuel; the heat required by the biofuel processing unit 4 is supplied by the waste heat of the thermal unit 1 of the pit-mouth coal-fired power plant;

[0070] (4) The biofuel is sent to the thermal unit 1 of the pit-mouth coal-fired power plant and burned together with coal to achieve carbon reduction.

[0071] In summary, the pit energy plant planting of the pit mouth coal power plant provided by the present invention utilizes the coupled carbon reduction method to plant water energy plants in the mine pit, utilizes the water energy plants to absorb and fix carbon, and produces biofuels to replace coal fuel for carbon reduction, thereby achieving soil restoration and ecological management of the mine pit, and simultaneously completing dual carbon reduction at the input and emission ends of the coal power plant, which is suitable for the low-carbon transformation of the pit mouth coal power plant.

[0072] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A method for coupling carbon reduction by planting and utilizing energy plants in a mine pit of a coal-fired power plant, characterized in that: The method comprises the following steps: (1) The flue gas generated by the thermal unit of the pit-mouth coal-fired power plant enters the flue gas distribution unit, and the flue gas is sent to the water body energy plant planting unit according to the demand for carbon dioxide in the water body energy plant planting unit, and the remaining flue gas is discharged through the chimney; (2) Photosynthesis is carried out in the water energy plant planting unit to harvest biomass raw materials; (3) The biomass raw material is processed in a biofuel processing unit according to the requirements of the thermal unit of the mine-mouth coal-fired power plant for the blended fuel to obtain biofuel; (4) The biofuel is fed into the thermal unit of the mine-mouth coal-fired power plant and burned together with coal to achieve carbon reduction.

2. The method according to claim 1, characterized in that The flue gas distribution unit in step (1) includes a flue gas volume regulating device or a carbon dioxide capture device.

3. The method according to claim 1 or 2, characterized in that: In step (1), before the flue gas enters the water body energy plant planting unit, it is adjusted according to the temperature and flow requirements of the water body energy plant planting unit.

4. The method according to any one of claims 1 to 3, characterized in that: The water energy plant planting unit in step (2) includes a mine pit; Preferably, the water environment conditions in the water energy plant planting unit are: pH value not less than 2.5, mineralization TDS not greater than 20000 mg / L, sulfate ion concentration not higher than 4500 mg / L, Fe element mass concentration not higher than 600 mg / L, Mn element mass concentration not higher than 45 mg / L.

5. The method according to any one of claims 1 to 4, characterized in that: In step (2), algae are planted in the water energy plant planting unit; Preferably, the water body energy plant planting unit plants Chlamydomonas species on the water surface, and plants black algae and brown algae in the water.

6. The method according to any one of claims 1 to 5, characterized in that: In step (2), the temperature of the water environment in the water energy plant planting unit is 20-30° C., preferably 20-25° C.; Preferably, the heat required by the water energy plant planting unit is supplied by the waste heat of the thermal unit of the pit mouth coal power plant.

7. The method according to any one of claims 1 to 6, characterized in that: The light intensity of the water energy plant planting unit in step (2) is 5000-15000 lx.

8. The method according to any one of claims 1 to 7, characterized in that: The carbon dioxide concentration of the water energy plant planting unit in step (2) is 10,000 to 30,000 ppm.

9. The method according to any one of claims 1 to 8, characterized in that: The requirements of the thermal unit of the pit-mouth coal power plant for the blended fuel in step (3) include the moisture content and particle size of the blended fuel; Preferably, the heat required by the biofuel processing unit is supplied by waste heat from the thermal unit of the mine-mouth coal power plant.

10. The method according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: (1) The flue gas generated by the thermal unit of the pit-mouth coal-fired power plant enters the flue gas distribution unit, and the flue gas is sent to the water body energy plant planting unit according to the demand for carbon dioxide in the water body energy plant planting unit, and the remaining flue gas is discharged through the chimney; the flue gas distribution unit includes a flue gas volume regulating device or a carbon dioxide capture device; before the flue gas enters the water body energy plant planting unit, it is regulated according to the temperature and flow requirements of the water body energy plant planting unit; (2) Photosynthesis is carried out in the water energy plant planting unit to harvest biomass raw materials; The water body energy plant planting unit includes a mine pit; the water environment conditions in the water body energy plant planting unit are: pH value not less than 2.5, mineralization TDS not more than 20000mg / L, sulfate ion concentration not higher than 4500mg / L, Fe element mass concentration not higher than 600mg / L, Mn element mass concentration not higher than 45mg / L; algae are planted in the water body energy plant planting unit; Chlamydomonas of the water body energy plant planting unit is planted on the water surface, and black algae and brown algae are planted in the water; The temperature of the water environment in the water energy plant planting unit is 20-30°C; the heat required by the water energy plant planting unit is supplied by the waste heat of the thermal unit of the pit mouth coal power plant; the light intensity of the water energy plant planting unit is 5000-15000lx; the carbon dioxide concentration of the water energy plant planting unit is 10000-30000ppm; (3) The biomass raw material is processed in a biofuel processing unit according to the requirements of the thermal unit of the pit-mouth coal-fired power plant for the moisture content and particle size of the blended fuel to obtain biofuel; the heat required by the biofuel processing unit is supplied by the waste heat of the thermal unit of the pit-mouth coal-fired power plant; (4) The biofuel is fed into the thermal unit of the mine-mouth coal-fired power plant and burned together with coal to achieve carbon reduction.

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