A method for co-gasification of coal and biomass

Abstract

The present invention provides a method for co-gasification of coal and biomass, belonging to the technical field of energy engineering. By optimizing the types, ratios and reaction conditions of the gasification raw materials, the present invention can significantly improve the coal gasification efficiency and reduce the emission of harmful gases. Utilizing the high reactivity of specific biomass to promote the gasification reaction of coal, thereby reducing the energy consumption in the overall gasification process. Through the co-gasification process, the present invention realizes the efficient utilization of coal and biomass resources and improves the energy conversion rate. The co-gasification method of the present invention can adapt to different types of coal and biomass raw materials, and has good versatility and flexibility. The co-gasification technology of the present invention has significant economic benefits in industrial applications, can reduce production costs and improve economic benefits.

Description

Technical Field

[0001] The present invention relates to the technical field of energy engineering, and particularly to a method for co-gasification of coal and biomass. Background Art

[0002] Coal gasification technology is a chemical technology that converts coal into combustible gas. The gasification process is a thermochemical processing process of coal. It uses coal or coal coke as raw materials, and oxygen (air, enriched oxygen or industrial pure oxygen), steam as gasifying agents, and through chemical reactions under high temperature and high pressure, converts the combustible part of coal or coal coke into combustible gas. The combustible gas obtained during gasification is called coal gas, and the coal gas used as chemical raw materials is generally called synthesis gas (synthesis gas can also use natural gas, heavy petroleum components, etc. as raw materials in addition to coal). The equipment for gasification is called a coal gas generator or gasifier.

[0003] Coal gasification involves a series of physical and chemical changes. Generally, it includes four stages: drying, combustion, pyrolysis, and gasification. Drying belongs to physical change. As the temperature rises, the moisture in coal evaporates by heat. The others belong to chemical changes, and combustion can also be considered as part of gasification. After the coal is dried in the gasifier, as the temperature further rises, the coal molecules undergo pyrolysis reactions, generating a large amount of volatile substances (including dry distillation gas, tar, and pyrolysis water, etc.), and at the same time, the coal agglomerates into semi-coke. The semi-coke formed after coal pyrolysis undergoes chemical reactions with the gasifying agents introduced into the gasifier at a higher temperature, generating gaseous products mainly composed of carbon monoxide, hydrogen, methane, carbon dioxide, nitrogen, hydrogen sulfide, water, etc., that is, raw coal gas. The gasification reaction includes many chemical reactions, mainly the reactions between carbon, water, oxygen, hydrogen, carbon monoxide, and carbon dioxide. Among them, the reaction between carbon and oxygen is also called the combustion reaction, which provides the heat for the gasification process.

[0004] In the existing technical field, although coal gasification technology has been applied to a certain extent, there are still some significant deficiencies. Specifically, the efficiency of these technologies is generally low, which means that a large amount of energy will be wasted during the process of converting coal into utilizable gas. In addition, these technologies are often accompanied by serious environmental pollution problems during operation, such as emitting a large amount of carbon dioxide and other harmful gases, which not only has a negative impact on the environment but also increases the difficulty and cost of subsequent treatment.

[0005] Therefore, in order to improve the practicality and sustainability of coal gasification technology, it is urgently needed to improve and optimize it. The direction of improvement can include improving the thermal efficiency of the gasification process and reducing energy waste; at the same time, developing more environmentally friendly gasification processes and reducing the emission of harmful gases, thereby reducing the burden on the environment. Through these improvement measures, coal gasification technology is expected to play a greater role in future energy utilization and better meet the requirements of environmental protection.

[0006] Chinese patent CN102786989B discloses a device for the co-gasification method of biomass and coal in a fluidized bed, including a fluidized bed combustion inner cylinder and a fluidized bed gasification outer cylinder of an inner and outer cylinder structure, as well as a matching gas-solid separation system and a return system, wherein two gasification agent inlets are respectively located at the upper and lower parts of the fluidized bed gasification outer cylinder to enhance the fluidization effect, so that the gasification reaction can be fully carried out, and at the same time, by changing the ratio of CO2 to water vapor in the gasification agent, a synthesis gas with different volume fraction ratios of H2 and CO is obtained; two feed ports are respectively provided to enter the gasification outer cylinder and the combustion inner cylinder, and the reaction process can be controlled by adjusting the feed amount; an inertial separator is used to control the material circulation amount by adjusting the compressed air feed amount and the lower L valve push gas feed amount, and it is not affected by other factors. The gasification equipment has a simple structure, high thermal efficiency, simple and convenient control, and extremely strong flexibility.

[0007] Chinese patent CN107189821A discloses a dry coal powder coupled biomass co-gasification descending quenching gasifier, comprising a gasifier shell, a water-cooled wall with a circulating water inlet and a circulating water outlet is arranged in the gasifier shell, a plurality of gas pulverized coal burners are arranged horizontally on the upper part of the gasifier shell, a burner integrated with biomass and gasifier ignition and start-up is arranged vertically on the top of the gasifier shell, and the burner is fixedly sealed by a top cover and the gasifier shell; the bottom of the water-cooled wall is connected to the top of the quenching tank through a partition plate, the bottom of the partition plate is connected to the quenching ring, the quenching ring is connected to the top of the downcomer, a bubble breaker is fixed between the outer wall of the downcomer and the inner wall of the gasifier shell, the quenching water inlet of the quenching ring is connected to the quenching water inlet arranged on the outer wall of the quenching tank, and the outer wall of the quenching tank is provided with a synthesis gas outlet and a slag water outlet. The present invention realizes the co-gasification of pulverized coal and biomass, is convenient for gasifier temperature control, and adopts a descending quenching form, so that the subsequent purification and dust removal system has a small burden, low energy consumption and high efficiency.

[0008] However, none of the above existing technologies can achieve the improvement of coal gasification effect while utilizing biological resources. Summary of the invention

[0009] The object of the present invention is to provide a method for co-gasification of coal and biomass, which can achieve efficient utilization of coal and biomass resources, improve energy conversion efficiency and reduce pollution.

[0010] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0011] The present invention provides a method for co-gasification of coal and biomass, comprising the following steps:

[0012] Mix coal, agricultural and forestry residues, fungal cultivation substrates, and shell waste to obtain a mixture;

[0013] Successively dry and pulverize the mixture to obtain a pulverized material;

[0014] Perform co-gasification on the pulverized material.

[0015] Preferably, the coal is selected from one or more of coking coal, bituminous coal, lean coal, gas coal, non-caking coal, lean coal, raw coal, washed coal, peat, fat coal, lignite, long-flame coal, weakly caking coal, medium caking coal, steam coal, jet coal, candle coal, or sub-bituminous coal.

[0016] Preferably, the agricultural and forestry residues are selected from one or more of forestry residues, waste wood, wood chips, crop straws, or waste crop residues.

[0017] Preferably, the crop straws or waste crop residues are from wheat, rice, corn, tubers, rapeseed, cotton, or sugarcane.

[0018] Preferably, by weight, the mixture comprises the following components:

[0019] 80 - 120 parts of coal, 40 - 80 parts of agricultural and forestry residues, 10 - 30 parts of fungal cultivation substrates, and 10 - 30 parts of shell waste.

[0020] Preferably, the drying temperature is 60 - 90 °C;

[0021] The drying time is 5 - 7 h.

[0022] Preferably, the particle size of the pulverization is below 300 μm.

[0023] Preferably, process gas is introduced during the co-gasification process;

[0024] The process gas is nitrogen;

[0025] The flow rate of the process gas is 2 - 3 L / s.

[0026] Preferably, the co-gasification temperature is 600 - 900 °C;

[0027] The co-gasification time is 20 - 40 min.

[0028] The present invention also provides the application of the above-mentioned method for co-gasification of coal and biomass in increasing the yields of H2 and CH4 in the product gas, reducing CO2 generation, lowering the temperature required for co-gasification, or increasing the calorific value of combustible gas.

[0029] Technical effects and advantages of the present invention:

[0030] By optimizing the types, ratios, and reaction conditions of gasification raw materials, the present invention can significantly improve the coal gasification efficiency and reduce harmful gas emissions. Utilizing the high reactivity of specific biomass to promote the gasification reaction of coal, thereby reducing the energy consumption of the overall gasification process. Through the co-gasification process, the present invention realizes the efficient utilization of coal and biomass resources and improves the energy conversion rate. The co-gasification method of the present invention can adapt to different types of coal and biomass raw materials and has good versatility and flexibility. The co-gasification technology of the present invention has significant economic benefits in industrial applications, can reduce production costs, and improve economic benefits.

[0031] As can be seen from the examples, compared with the control group, the coal and biomass co-gasification scheme provided by the present invention can effectively increase the yields of H2 and CH4 in the product gas while reducing the generation of CO2; the generated H2 and CH4 can be separated and used as high-efficiency green fuels, which helps to promote the optimization of the energy structure, reduce the dependence on fossil fuels, and promote the sustainable development of energy; and the components of the present invention cooperate with each other to enable further catalysis in the coal gasification process, reduce the temperature required for co-gasification, achieve energy conservation and carbon reduction, and are of great significance to environmental protection. Specific implementation manners

[0032] The present invention provides a coal and biomass co-gasification method, which includes the following steps:

[0033] Mix coal, agricultural and forestry residues, fungal cultivation substrates, and shell waste to obtain a mixture;

[0034] Dry and crush the mixture in sequence to obtain a crushed material;

[0035] Perform co-gasification on the crushed material.

[0036] In the present invention, preferably, the coal is selected from one or more of coking coal, bituminous coal, lean coal, gas coal, non-caking coal, lean coal, raw coal, washed coal, peat, fat coal, lignite, long-flame coal, weakly caking coal, medium caking coal, steam coal, jet coal, candle coal, or sub-bituminous coal; the coal is preferably applied in the form of pulverized coal; the particle size of the pulverized coal is below 0.5 mm.

[0037] In the present invention, preferably, the agricultural and forestry residues are selected from one or more of forestry residues, waste wood, wood chips, crop straws, or waste crop residues; preferably, the crop straws or waste crop residues are from wheat, rice, corn, potatoes, rapeseed, cotton, or sugarcane; in the specific implementation manner of the present invention, the agricultural and forestry residues are preferably wood chips and bagasse.

[0038] In the present invention, the significance of utilizing agricultural and forestry residues includes the following aspects:

[0039] 1. Agricultural and forestry residues are usually regarded as useless by-products and may even cause environmental pollution. However, through the technical means of the present invention, these agricultural and forestry residues can be effectively utilized and transformed into valuable resources.

[0040] 2. Utilizing agricultural and forestry residues can reduce environmental pollution. Traditional treatment methods such as incineration or discarding not only waste resources but also generate a large amount of carbon dioxide and other harmful gases, leading to a decline in air quality and an exacerbation of the greenhouse effect. Through the technology of the present invention, these residues can be transformed into bioenergy or other environmentally friendly materials, thereby reducing the dependence on fossil fuels and lowering carbon emissions.

[0041] 3. Utilizing agricultural and forestry residues can also promote the sustainable development of agriculture. By transforming these wastes into valuable resources, farmers can obtain additional economic benefits and improve their enthusiasm for agricultural production. At the same time, this resource utilization method can also reduce the use of chemical fertilizers and pesticides, improve soil quality, and increase the yield and quality of crops.

[0042] 4. Utilizing agricultural and forestry residues can also drive the development of related industries. For example, by transforming agricultural and forestry residues into bioenergy, biomass materials, etc., it can drive the development of new energy industries and environmental protection industries, create more employment opportunities, and promote the diversified development of the economy.

[0043] Therefore, the significance of utilizing agricultural and forestry residues in the present invention includes promoting the recycling of resources, reducing environmental pollution, driving the sustainable development of agriculture, and driving the development of related industries, and has important economic, social, and environmental benefits.

[0044] In the present invention, preferably, by weight parts, the mixture includes the following components:

[0045] 80 - 120 parts of coal, 40 - 80 parts of agricultural and forestry residues, 10 - 30 parts of fungal cultivation substrate, and 10 - 30 parts of shell waste.

[0046] The selection of the types and proportions of the co-gasification materials involved in the present invention can fully exert the optimal effect of promoting the coal gasification reaction. Through careful design and optimization, these material types and proportions can significantly improve the reaction efficiency during the coal gasification process, thereby achieving the purpose of energy conservation and emission reduction. Specifically, by reasonably matching different types of materials, the energy consumption during the coal gasification process can be effectively reduced, the emission of harmful gases can be reduced, and the quality and yield of coal gas can be improved. The innovative co-gasification technology provided by the present invention can not only improve the energy utilization efficiency but also play an important role in environmental protection, achieving a double improvement in economic and environmental benefits.

[0047] Preferably in the present invention, the drying temperature is 60 - 90°C; the drying time is 5 - 7 h. Preferably, the particle size after grinding is below 300 μm. Preferably, process gas is introduced during the co-gasification process; the process gas is nitrogen; the flow rate of the process gas is 2 - 3 L / s. Preferably, the co-gasification temperature is 600 - 900°C; the co-gasification time is 20 - 40 min.

[0048] The co-gasification process parameters involved in the present invention are carefully designed and optimized to ensure that the produced gas product has the highest quality. These parameters include various factors such as temperature, pressure, and raw material ratio. Each step has been strictly calculated and experimentally verified to ensure that the quality of the final product reaches the optimum. If any changes are made to these parameters, the same high-quality effect cannot be achieved. Therefore, it is crucial to follow the process parameters provided by the present invention. Any deviation may lead to a decrease in product quality and fail to meet the high standards required in industrial applications.

[0049] The present invention also provides the application of the above-mentioned coal and biomass co-gasification method in increasing the production of H2 and CH4 in the product gas, reducing CO2 generation, lowering the co-gasification temperature, or increasing the calorific value of combustible gas. The application of the present invention also includes using the gas produced by co-gasification as an energy source, such as for power generation or as an industrial fuel, thereby improving the energy utilization efficiency and economic benefits.

[0050] The technical solutions provided by the present invention will be described in detail below in conjunction with embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0051] Example 1

[0052] 100 parts of pulverized coal, 30 parts of poplar sawdust, 30 parts of bagasse, 20 parts of waste Pleurotus ostreatus cultivation substrate, and 20 parts of shell waste were dried at 75°C for 6 h and ground to a particle size less than 200 μm.

[0053] Using a pulverized coal entrained flow gasification device with pulverized coal entrained flow gasification technology, nitrogen with a flow rate of 2.5 L / s was introduced and gasified at 800°C for 30 min.

[0054] During the co-gasification process, the generation amounts of H2, CH4, and CO2 corresponding to each gram of the mixed material were detected and calculated, which were 0.85 g, 14.36 g, and 0.38 g respectively. The highest calorific value of combustible gas during the co-gasification process was recorded as 5492.26 J / L.

[0055] Example 2

[0056] Dry 100 parts of pulverized coal, 25 parts of poplar sawdust, 30 parts of bagasse, 25 parts of waste Pleurotus ostreatus cultivation substrate, and 20 parts of shell waste at 75 °C for 6 h, and pulverize to a particle size less than 200 μm;

[0057] In a pulverized coal gasification device using pulverized coal entrained flow gasification technology, introduce nitrogen with a flow rate of 2.5 L / s and gasify at 800 °C for 30 min.

[0058] During the co-gasification process, detect and calculate the generation amounts of H2, CH4, and CO2 corresponding to each gram of the mixed material, which are 0.86 g, 14.13 g, and 0.47 g respectively, and record the highest combustible gas calorific value during the co-gasification process as 5206.19 J / L.

[0059] Example 3

[0060] Dry 100 parts of pulverized coal, 35 parts of poplar sawdust, 30 parts of bagasse, 15 parts of waste Pleurotus ostreatus cultivation substrate, and 20 parts of shell waste at 75 °C for 6 h, and pulverize to a particle size less than 200 μm;

[0061] In a pulverized coal gasification device using pulverized coal entrained flow gasification technology, introduce nitrogen with a flow rate of 2.5 L / s and gasify at 800 °C for 30 min.

[0062] During the co-gasification process, detect and calculate the generation amounts of H2, CH4, and CO2 corresponding to each gram of the mixed material, which are 0.85 g, 14.76 g, and 0.41 g respectively, and record the highest combustible gas calorific value during the co-gasification process as 5272.42 J / L.

[0063] Example 4

[0064] Dry 100 parts of pulverized coal, 30 parts of poplar sawdust, 25 parts of bagasse, 20 parts of waste Pleurotus ostreatus cultivation substrate, and 25 parts of shell waste at 75 °C for 6 h, and pulverize to a particle size less than 200 μm;

[0065] In a pulverized coal gasification device using pulverized coal entrained flow gasification technology, introduce nitrogen with a flow rate of 2.5 L / s and gasify at 800 °C for 30 min.

[0066] During the co-gasification process, detect and calculate the generation amounts of H2, CH4, and CO2 corresponding to each gram of the mixed material, which are 0.85 g, 14.11 g, and 0.44 g respectively, and record the highest combustible gas calorific value during the co-gasification process as 5163.52 J / L.

[0067] Example 5

[0068] Dry 100 parts of pulverized coal, 30 parts of poplar sawdust, 35 parts of bagasse, 20 parts of waste Pleurotus ostreatus cultivation substrate, and 15 parts of shell waste at 75 °C for 6 h, and pulverize to a particle size less than 200 μm;

[0069] A pulverized coal gasification device using the pulverized coal entrained flow gasification technology, nitrogen with a flow rate of 2.5 L / s is introduced, and gasification is carried out at 800 °C for 30 min.

[0070] During the co-gasification process, the generation amounts of H2, CH4, and CO2 corresponding to each gram of the mixed material are detected and calculated, which are 0.84 g, 14.47 g, and 0.38 g respectively, and the highest calorific value of the combustible gas during the co-gasification process is recorded as 5354.92 J / L.

[0071] Example 6

[0072] 100 parts of pulverized coal, 35 parts of poplar sawdust, 25 parts of bagasse, 15 parts of waste Pleurotus ostreatus cultivation substrate, and 25 parts of shell waste are dried at 75 °C for 6 h and pulverized to a particle size less than 200 μm;

[0073] A pulverized coal gasification device using the pulverized coal entrained flow gasification technology, nitrogen with a flow rate of 2.5 L / s is introduced, and gasification is carried out at 800 °C for 30 min.

[0074] During the co-gasification process, the generation amounts of H2, CH4, and CO2 corresponding to each gram of the mixed material are detected and calculated, which are 0.88 g, 15.05 g, and 0.49 g respectively, and the highest calorific value of the combustible gas during the co-gasification process is recorded as 5445.44 J / L.

[0075] Example 7

[0076] 100 parts of pulverized coal, 25 parts of poplar sawdust, 25 parts of bagasse, 25 parts of waste Pleurotus ostreatus cultivation substrate, and 25 parts of shell waste are dried at 70 °C for 7 h and pulverized to a particle size less than 200 μm;

[0077] A pulverized coal gasification device using the pulverized coal entrained flow gasification technology, nitrogen with a flow rate of 2.5 L / s is introduced, and gasification is carried out at 800 °C for 30 min.

[0078] During the co-gasification process, the generation amounts of H2, CH4, and CO2 corresponding to each gram of the mixed material are detected and calculated, which are 0.90 g, 14.40 g, and 0.52 g respectively, and the highest calorific value of the combustible gas during the co-gasification process is recorded as 5252.50 J / L.

[0079] Example 8

[0080] 100 parts of pulverized coal, 25 parts of poplar sawdust, 33 parts of bagasse, 18 parts of waste Pleurotus ostreatus cultivation substrate, and 25 parts of shell waste are dried at 75 °C for 6 h and pulverized to a particle size less than 200 μm;

[0081] A pulverized coal gasification device using the pulverized coal entrained flow gasification technology, nitrogen with a flow rate of 2 L / s is introduced, and gasification is carried out at 700 °C for 40 min.

[0082] During the co-gasification process, the generation amounts of H2, CH4, and CO2 corresponding to each gram of the mixed material were detected and calculated, which were 0.82 g, 14.31 g, and 0.51 g respectively. The highest calorific value of the combustible gas during the co-gasification process was recorded as 5279.89 J / L.

[0083] Example 9

[0084] 80 parts of pulverized coal, 25 parts of poplar sawdust, 25 parts of bagasse, 15 parts of waste Pleurotus ostreatus cultivation substrate, and 15 parts of shell waste were dried at 75 °C for 6 h and pulverized to a particle size less than 150 μm.

[0085] Using a pulverized coal entrained flow gasification device with pulverized coal entrained flow gasification technology, nitrogen with a flow rate of 2.5 L / s was introduced and gasified at 700 °C for 30 min.

[0086] During the co-gasification process, the generation amounts of H2, CH4, and CO2 corresponding to each gram of the mixed material were detected and calculated, which were 0.90 g, 15.05 g, and 0.46 g respectively. The highest calorific value of the combustible gas during the co-gasification process was recorded as 5256.85 J / L.

[0087] Example 10

[0088] 120 parts of pulverized coal, 35 parts of poplar sawdust, 35 parts of bagasse, 25 parts of waste Pleurotus ostreatus cultivation substrate, and 25 parts of shell waste were dried at 80 °C for 7 h and pulverized to a particle size less than 200 μm.

[0089] Using a pulverized coal entrained flow gasification device with pulverized coal entrained flow gasification technology, nitrogen with a flow rate of 2.5 L / s was introduced and gasified at 850 °C for 30 min.

[0090] During the co-gasification process, the generation amounts of H2, CH4, and CO2 corresponding to each gram of the mixed material were detected and calculated, which were 0.87 g, 14.01 g, and 0.45 g respectively. The highest calorific value of the combustible gas during the co-gasification process was recorded as 5226.91 J / L.

[0091] Example 11

[0092] 110 parts of pulverized coal, 32 parts of poplar sawdust, 32 parts of bagasse, 22 parts of waste Pleurotus ostreatus cultivation substrate, and 15 parts of shell waste were dried at 75 °C for 6 h and pulverized to a particle size less than 200 μm.

[0093] Using a pulverized coal entrained flow gasification device with pulverized coal entrained flow gasification technology, nitrogen with a flow rate of 2.5 L / s was introduced and gasified at 850 °C for 30 min.

[0094] During the co-gasification process, the generation amounts of H2, CH4, and CO2 corresponding to each gram of the mixed material were detected and calculated, which were 0.84 g, 14.13 g, and 0.43 g respectively. The highest calorific value of the combustible gas during the co-gasification process was recorded as 5201.07 J / L.

[0095] Example 12

[0096] 100 parts of pulverized coal, 27 parts of poplar sawdust, 25 parts of bagasse, 25 parts of waste Pleurotus ostreatus cultivation substrate, and 23 parts of shell waste were dried at 75 °C for 6 h and pulverized to a particle size less than 200 μm.

[0097] Using a pulverized coal entrained flow gasification device with pulverized coal entrained flow gasification technology, nitrogen with a flow rate of 2.5 L / s was introduced and gasified at 850 °C for 40 min.

[0098] During the co-gasification process, the generation amounts of H2, CH4, and CO2 corresponding to each gram of the mixed material were detected and calculated, which were 0.85 g, 14.55 g, and 0.49 g respectively. The highest calorific value of the combustible gas during the co-gasification process was recorded as 5400.40 J / L.

[0099] Example 13

[0100] 110 parts of pulverized coal, 34 parts of poplar sawdust, 28 parts of bagasse, 18 parts of waste Pleurotus ostreatus cultivation substrate, and 24 parts of shell waste were dried at 75 °C for 6 h and pulverized to a particle size less than 200 μm.

[0101] Using a pulverized coal entrained flow gasification device with pulverized coal entrained flow gasification technology, nitrogen with a flow rate of 2.5 L / s was introduced and gasified at 850 °C for 30 min.

[0102] During the co-gasification process, the generation amounts of H2, CH4, and CO2 corresponding to each gram of the mixed material were detected and calculated, which were 0.83 g, 14.85 g, and 0.51 g respectively. The highest calorific value of the combustible gas during the co-gasification process was recorded as 5490.01 J / L.

[0103] Example 14

[0104] 100 parts of pulverized coal, 30 parts of poplar sawdust, 30 parts of bagasse, 20 parts of waste Pleurotus ostreatus cultivation substrate, and 20 parts of shell waste were dried at 75 °C for 6 h and pulverized to a particle size less than 100 μm.

[0105] Using a pulverized coal entrained flow gasification device with pulverized coal entrained flow gasification technology, nitrogen with a flow rate of 2.5 L / s was introduced and gasified at 850 °C for 30 min.

[0106] During the co-gasification process, the generation amounts of H2, CH4, and CO2 corresponding to each gram of the mixed materials were detected and calculated, which were 0.88 g, 14.82 g, and 0.50 g respectively, and the highest calorific value of the combustible gas during the co-gasification process was recorded as 5336.27 J / L.

[0107] Example 15

[0108] 100 parts of pulverized coal, 30 parts of poplar sawdust, 30 parts of bagasse, 22 parts of waste Pleurotus ostreatus cultivation substrate, and 18 parts of shell waste were dried at 75 °C for 6 h and pulverized to a particle size less than 200 μm.

[0109] Using a pulverized coal entrained flow gasification device with pulverized coal entrained flow gasification technology, nitrogen with a flow rate of 3 L / s was introduced and gasified at 900 °C for 30 min.

[0110] During the co-gasification process, the generation amounts of H2, CH4, and CO2 corresponding to each gram of the mixed materials were detected and calculated, which were 0.82 g, 15.19 g, and 0.46 g respectively, and the highest calorific value of the combustible gas during the co-gasification process was recorded as 5469.75 J / L.

[0111] Comparative Example 1

[0112] 100 parts of pulverized coal and 100 parts of poplar sawdust were dried at 75 °C for 6 h and pulverized to a particle size less than 200 μm.

[0113] Using a pulverized coal entrained flow gasification device with pulverized coal entrained flow gasification technology, nitrogen with a flow rate of 2.5 L / s was introduced and gasified at 800 °C for 30 min.

[0114] During the co-gasification process, the generation amounts of H2, CH4, and CO2 corresponding to each gram of the mixed materials were detected and calculated, which were 0.31 g, 7.64 g, and 2.55 g respectively, and the highest calorific value of the combustible gas during the co-gasification process was recorded as 4017.04 J / L.

[0115] Comparative Example 2

[0116] 100 parts of pulverized coal, 20 parts of waste Pleurotus ostreatus cultivation substrate, and 20 parts of shell waste were dried at 75 °C for 6 h and pulverized to a particle size less than 200 μm.

[0117] Using a pulverized coal entrained flow gasification device with pulverized coal entrained flow gasification technology, nitrogen with a flow rate of 2.5 L / s was introduced and gasified at 900 °C for 30 min.

[0118] During the co-gasification process, the generation amounts of H2, CH4, and CO2 corresponding to each gram of the mixed materials were detected and calculated, which were 0.45 g, 9.05 g, and 1.46 g respectively, and the highest calorific value of the combustible gas during the co-gasification process was recorded as 3844.29 J / L.

[0119] As can be seen from the above embodiments, compared with the control group, the coal and biomass co-gasification solution provided by the present invention can effectively increase the yields of H2 and CH4 in the product gas while reducing the generation of CO2; the generated H2 and CH4 can be separated and used as efficient green fuels, which helps to promote the optimization of the energy structure, reduce the dependence on fossil fuels, and promote the sustainable development of energy; moreover, the components of the present invention cooperate with each other to achieve further catalysis in the coal gasification process, reduce the temperature required for co-gasification, achieve energy conservation and carbon reduction, and are of great significance to environmental protection.

[0120] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A method for co-gasification of coal and biomass, characterized in that, It includes the following steps: Mix coal, agricultural and forestry residues, fungal cultivation substrates and shell waste to obtain a mixture; Successively dry and pulverize the mixture to obtain a pulverized material; Perform co-gasification on the pulverized material; By weight, the mixture includes the following components: 80 - 120 parts of coal, 40 - 80 parts of agricultural and forestry residues, 10 - 30 parts of fungal cultivation substrates, 10 - 30 parts of shell waste; The temperature of the drying is 60 - 90 °C; the time of the drying is 5 - 7 h; The particle size of the pulverization is below 300 μm; Process gas is introduced during the co-gasification; the process gas is nitrogen; the flow rate of the process gas is 2 - 3 L / s; The temperature of the co-gasification is 600 - 900 °C; the time of the co-gasification is 20 - 40 min.

2. The coal and biomass co-gasification method according to claim 1, wherein The coal is selected from one or more of coking coal, lean coal, gas coal, non-caking coal, lean coal, raw coal, washed coal, peat, fat coal, lignite, long-flame coal, weakly caking coal, medium caking coal, jet coal, cannel coal or sub-bituminous coal.

3. The coal and biomass co-gasification method according to claim 1, characterized in that, The agricultural and forestry residues are selected from one or more of waste wood, wood chips, crop straws or waste crop residues.

4. The coal and biomass co-gasification method according to claim 3, wherein, The crop straws or waste crop residues come from wheat, rice, corn, tubers, rapeseed, cotton or sugarcane.

5. Application of the co-gasification method of coal and biomass according to any one of claims 1 - 4 in increasing the yields of H2 and CH4 in product gas, reducing CO2 generation, lowering the temperature required for co-gasification or increasing the calorific value of combustible gas.