A pre-reaction device for a pulverized coal boiler

Abstract

The invention discloses a preposed reaction device of a pulverized coal boiler. The preposed reaction device comprises a preposed reaction mechanism, a rich-lean pulverized coal separation mechanism, an ignition mechanism, a steam system, an air system and an oxygen system, wherein an inlet channel, a reaction chamber and an outlet channel of the preposed reaction mechanism are communicated sequentially; the tail end of the outlet channel is communicated with a hearth of the boiler; the rich-lean pulverized coal separation mechanism comprises a rich-lean separator, a rich pulverized coal section and a lean pulverized coal section; the rich-lean separator is communicated with the inlet channel of the reaction chamber through the rich pulverized coal section, and is communicated with the hearth of the boiler through the lean pulverized coal section; the ignition mechanism is arranged at the inlet channel part, and is used for igniting the thick pulverized coal entering the reaction chamber; and the steam system, the air system and the oxygen system are respectively arranged on the reaction chamber, and are respectively used for regulating the flow rate of steam, air and oxygen entering the reaction chamber. The preposed reaction device of the pulverized coal boiler provided by the invention can lower NOx content in flue gas, can lower the running cost, and can improve the adaptability of a boiler to coal quality.

Description

technical field [0001] The invention relates to the technical field of pulverized coal boiler combustion, in particular to a pre-reaction device of a pulverized coal boiler. Background technique [0002] my country's primary energy is dominated by coal, and the installed capacity of thermal power generation exceeds 700 million kilowatts, NO x Huge emissions, in 2007 my country's thermal power NO x The emission is 8.55 million tons, and it was 10.38 million tons in 2010. Due to the increase in emissions and hazards year by year, the Chinese government is strict with NO x Emissions to take active control measures, the formulation of more stringent standards. In 2011, the Ministry of Environmental Protection promulgated a new "Emission Standard of Air Pollutants for Thermal Power Plants" (GB13223-2011) to replace GB13223-2003, which will be implemented from January 1, 2012. The latest emission standard stipulates that since July 1, 2014, the nitrogen oxide emission limit for...

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Problems solved by technology

[0006] In view of this, the object of the present invention is to provide a pre-reaction device of a pulverized coal boiler to solve the problem of NO in the flue gas. x High content, high operating costs, and poor adaptability of boilers to coal quality

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