Device and method for reducing discharging of boiler NOx in powder mode

Abstract

The invention discloses a device and method for reducing discharging of boiler NOx in a powder mode. The device comprises a first smoke pipeline and a second smoke pipeline. The initial end of the first smoke pipeline is arranged behind an economizer in a smoke channel, and the tail end of the first smoke pipeline is arranged in a hearth. A first check valve, a boiler smoke draught fan, a third electrically operated valve and a coal mill are connected to a pipe way of the first smoke pipeline in sequence. The second smoke pipeline is connected to the pipe way between the first check valve and the boiler smoke draught fan. When mixed smoke carrying coal dust enters the hearth to burn, burning is carried out in an oxygen deficient state, combination between N and O is reduced, the reducing atmosphere of the hearth is enhanced, the production of NOx is restrained intensely, and the content of NOx in the smoke is reduced. The device and method are combined with the tail smoke denitrition technology, the usage amount of catalyst and reductant can be saved, denitration cost and energy consumption are reduced, the denitration efficiency is guaranteed, and a denitration system can safely run in an economical mode. The device and method can be widely applied to smoke denitration systems in the electric power industry, the petrochemical industry and the like.

Description

technical field [0001] The invention relates to boiler flue gas NO x In the field of emission reduction, it particularly relates to a device and method for reducing boiler NOx emission by pulverizing. Background technique [0002] NO x As an air pollutant, it is not only one of the main substances that form acid rain, but also the three major environmental hazards in the world are related to it. NO x There are a wide range of sources, human activities, industrial production, etc. can produce NO x . Environmental protection data show that the NO produced by industrial production due to fuel combustion x Emissions are increasing year by year. In 2012 alone, the emissions reached 23.378 million tons, an increase of 8.805 million tons compared with 2006, an increase of 57.8%. With the enhancement of environmental protection awareness and economic level, environmental protection laws and regulations on NO contained in industrial flue gas x The emission control is becoming ...

AI Technical Summary

Problems solved by technology

[0004] In order to ensure tail flue gas NO x The emission reaches the standard, and at the same time overcomes the shortcomings of the existing tail flue gas denitrification technology, such as harsh reaction conditions, high construction costs, and high operating costs. The combination of gas side denitrification technology can not only reduce the NOx when the flue gas enters the denitrification tower x content, and can reduce the use of catalysts and reducing agents, thereby reducing the load on the tail flue gas denitrification system, so that the denitrification system can operate safely and economically

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