Biomass gas and coal dust mixed combustion process

A biomass gas and biomass technology, which is applied in the direction of burners, joint combustion mitigation, lighting and heating equipment, etc., can solve the problems that co-combustion technology does not pay attention to biomass and coal co-combustion technology, so as to reduce the generation of NO, The effect of reducing emission levels and alleviating slagging in the furnace

Inactive Publication Date: 2010-11-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

Although my country's current policies and regulations have not adopted corresponding incentive mechanisms to promote the de...

Method used

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  • Biomass gas and coal dust mixed combustion process
  • Biomass gas and coal dust mixed combustion process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Taking the 600MW unit boiler of a power plant as an example, the four-corner tangential combustion method is adopted, the coal consumption is 116.37kg / s, the low-level calorific value of coal is 14.7MJ / kg, and the composition of the biomass gasification gas by volume ratio is : CO: 25.5%, H 2 : 18.5%, CH 4 : 1%, CO 2 : 5.3%, N 2 : 49.7%, when the blending amount is 200,000 tons / year, the blending ratio is 5%.

Embodiment 2

[0024] When 400,000 t / y (combustion ratio is 8%), biomass gasification gas is injected from biomass gas nozzle A, the nozzle is 0.705m long and 0.305m wide, and the cross-sectional area of ​​biomass gas injection is 1.72m 2 , the injection speed is 20.67m / s, and the NO removal rate can reach 60%; when the blended firing rate is 750,000 t / y (the blended firing ratio is 15%), the injection cross-sectional area is 1.72m 2 , the injection speed is 38.75m / s, and the NO removal rate can reach 66%.

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Abstract

The invention belongs to the technical field of biomass power generation, and particularly relates to a new biomass gas and coal dust mixed combustion process. The process adopts a biomass gasification system, a high-temperature dust removal system, a coal dust boiler and an auxiliary system thereof; and the biomass is gasified in a gasification furnace, the generated biomass gasification gas enters the high-temperature dust removal system, solid granules are removed, and then the high-temperature biomass gas is sprayed into the coal dust boiler and is combusted in the coal dust boiler. The process realizes efficient and reasonable utilization of fuels with low heat value, can avoid the problems of boiler slag formation and monitoring and the like produced in a direct mixed combustion process of the biomass, effectively reduce the discharge of pollutants such as NOX and the like and improve the combustion efficiency, and meanwhile can prevent the coal dust components from being affected, ensure later effective utilization and fulfill dual purposes of energy conservation and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of biomass power generation, and in particular relates to a new co-combustion process of biomass gas and pulverized coal. Background technique [0002] my country is a large agricultural country with relatively rich biomass resources. The annual output of four types of biomass resources, such as crop straw, firewood, animal manure and domestic waste, is equivalent to 780 million tce, which is 50% higher than my country's total energy consumption in 2000. % more. Therefore, the use of biomass for power generation and heating has gradually attracted people's attention, but it is difficult for many biomass direct-fired power plants operating in my country to achieve high utilization efficiency, and the co-firing of biomass and pulverized coal can effectively improve the combustion efficiency. No need for boiler modification and can effectively reduce NO X and CO 2 It is a low-cost, low-risk renewable energy ut...

Claims

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Application Information

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IPC IPC(8): F23D17/00
CPCY02E20/16Y02E20/18
Inventor 张俊姣赵芳芳董长青杨勇平陆强刘文毅
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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