Application of multi-section composition pollutant removing technology in novel coal powder industrial boilers

Abstract

The invention discloses the technology for removing pollutants in coal powder burning, in particular to application of multi-section composition pollutant removing technology in novel coal powder industrial boilers. The application includes steps of reducing sulfur content and ash content of fuel coal by washing raw coal, burning by low-nitrogen cyclone burner, realizing low-nitrogen combustion of coal powder, completing efficient dust extraction after burning by adopting cloth bag dust extraction technology, desulfurizing smoke, and desulfurizing tail smoke by the smoke desulfurizing technology after a cloth bag deduster. Pollutant removal technologies before, during and after burning are combined to use, and since the multi-section composition pollutant removing technology is adopted from raw coal to tail smoke purifying, high smoke and sulfur dioxide removal efficiency is realized on the premise of low burden of the single technology.

Description

technical field [0001] The invention relates to a pollutant removal technology in pulverized coal combustion, in particular to the application of a multi-stage combined pollutant removal technology in a new pulverized coal industrial boiler. Background technique [0002] Coal-fired industrial boilers are the main thermal energy equipment in my country. According to statistics, as of 2010, the total number reached 601,200 units, with a total capacity of 3.48 million steam tons and an annual coal consumption of nearly 700 million tons. The emission of coal-fired pollutants is large, second only to coal-fired power generation, and it is the main source of urban air pollution. At present, coal-fired industrial boilers are mainly chain furnaces, accounting for more than 85%. In addition, there are a small amount of reciprocating grates, fixed Grates, circulating fluidized bed boilers and other chain furnaces use crushed coal for combustion, with uneven particle size, high air exc...

AI Technical Summary

Problems solved by technology

[0006] (1) The quality and variety of fuel coal cannot be effectively controlled. In some areas, only "low sulfur" is used as a control indicator, and the control of chain boilers on key indicators such as volatile matter and particle size of fuel coal is ignored, which reduces operating efficiency and increases pollutants. emission

[0007] (2) Most of the existing dust removal technologies and equipment cannot effectively control and reduce the concentration of smoke and dust emissions

[0008] (3) The chain boiler is fired in a crushed coal layer, and there is basically no control method for the generation and emission of NOx

[0009] (4) For coal-fired industrial boilers with small and medium capacity (less than 20 tons / hour), they are generally equipped with simple tail gas desulfurization technology and equipment, which has poor operational reliability and low average desulfurization rate

Desulfurization waste residues often have secondary pollution problems

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