Lignite boiler combustion method capable of reducing nitrogen oxide emission

Abstract

The invention provides a brown coal boiler combustion method capable of reducing discharge of nitrogen oxide and relates to a method for boiler combustion of the brown coal. The method solves the problems that slag bonding is easy to appear in the boiler combustion of the brown coal by adopting air fractional combustion technology, a catalyst is needed, system investment is huge and operating cost is high in the boiler combustion of the brown coal by adopting selective catalytic reduction technology and denitration efficiency is low in the boiler combustion of the brown coal by adopting selective non-catalytic reduction technology. A brown coal boiler with the furnace being divided into a primary combustion zone (1) and a burnout zone (2) from bottom to top is adopted in the brown coal boiler combustion method capable of reducing discharge of nitrogen oxide. An amino group reducer is sprayed grade by grade during the combustion process of the brown coal. By the two methods of the invention, the discharge of the nitrogen oxide can be reduced by more than 60% and the combustion efficiency of the brown coal is up to more than 98%. By the two methods, no slag bonding appears during the combustion of the brown coal, no catalyst is needed and the operating cost is only around 30% of the operating cost of the selective catalytic reduction method.

Description

technical field [0001] The invention relates to a method for burning lignite in a boiler. Background technique [0002] Nitrogen oxides (NO X ) is one of the main air pollutants emitted by coal-fired boilers. In addition to forming acid rain and destroying the ecological environment, nitrogen oxides can also form photochemical smog, which directly endangers human health. At present, nitrogen oxides have become an air pollutant second only to sulfur dioxide in my country, and their impact on acid rain, air quality and ground ozone concentration is increasing. On January 1, 2004, the new "Emission Standard of Air Pollutants for Thermal Power Plants" (GB13223-2003) was implemented, which is more stringent than the previous standard. Since July 1, 2004, the state has charged 0.6 yuan per pollution equivalent of nitrogen oxides (0.95 kilograms of nitrogen oxides) directly to the unit that emits pollutants. Therefore, it is necessary to reduce nitrogen while ensuring coal combus...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of slagging that is easy to occur in boilers burning lignite with air staged combustion technology at present, the need for catalysts, huge system investment and high operating cost when using selective catalytic reduction technology to burn lignite in boilers, and the use of selective non-catalytic reduction technology for denitrification In order to solve the problem of low efficiency, it provides a lignite boiler combustion method that can reduce nitrogen oxide emissions

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