Device and method for cooperatively producing carbon and heat through gasification power generation of biomass fixed bed

Abstract

The invention relates to a method for cooperatively producing carbon and heat through gasification power generation of a biomass fixed bed. According to the method, by utilizing middle-heat-value combustible gas, the heat requirement of a high-temperature high-pressure boiler can be met, and the integral power generation efficiency is improved; and nitrogen oxide is low in content and can meet environmental protection requirements, and denitrification is not required. The method comprises the following steps: sending biomass raw materials into a gasification device for preparing middle-heat-value biomass combustible gas, gasifying the biomass raw materials under the action of air-vapor premixed gasifying agent at 700-850 DEG C so as to produce combustible gas, wherein the heat value of the combustible gas is 1600Kcal-1800Kcal, and the temperature is 200-300 DEG C; directly introducing the combustible gas into an environment-friendly combustion cavity for combustion, introducing the combustible gas into the high-temperature high-pressure boiler for combustion to produce high-temperature high-pressure steam so as to push the steam turbine to generate power, and utilizing steam waste heat discharged from the steam turbine; and heating air by virtue of an air preheater through boiler tail gas, respectively introducing hot air into a combustion cavity and the gasification device by virtue of an air blower, and utilizing the waste heat.

Description

technical field [0001] The invention relates to a biomass fixed-bed gasification device and process for co-producing charcoal and heat, belonging to the field of biomass energy. Background technique [0002] Under the dual pressure of energy and the environment, vigorously developing clean and renewable energy has become a very urgent worldwide issue before governments all over the world. Compared with other new energy sources, biomass energy has the characteristics of being renewable, less polluting, transportable and storing, and most compatible with the current energy industry, so it has attracted special attention. China is a large agricultural country with rich agricultural and forestry biomass resources, huge quantity and diverse varieties. Under the background of favorable policies, the utilization of biomass resources has achieved considerable development in China, but at the same time, many problems in technology and equipment have arisen. [0003] Biomass gasific...

AI Technical Summary

Problems solved by technology

Looking at the current biomass resource utilization gasification power generation process and equipment: single product, low economic benefits; wet purification system, resulting in water pollution; internal combustion engine and gas turbine power generation system with poor stability due to incomplete purification

The team of Nanjing Forestry University proposed a polygeneration process in which biomass gasification heat is fired by a gas-fired boiler to drive a steam turbine to generate electricity. The content of nitrogen oxides is low, but due to the increasing environmental protection requirements, tail gas denitrification treatment is also necessary, and the denitrification treatment is expensive, so it is not suitable for small-scale industrial projects; Low value, not suitable for high-temperature and high-pressure boilers, affecting the overall efficiency of power generation

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