Flue structure for SNCR (selective non-catalytic reduction) denitration of flue gas of pulverized coal boiler and heating of sludge drying heat-conducting oil

Abstract

The invention provides a flue structure for SNCR (selective non-catalytic reduction) denitration of flue gas of a pulverized coal boiler and heating of sludge drying heat-conducting oil. An SNCR denitration device is arranged in a proper area in a flue of the pulverized coal boiler, so that the flue gas carrying a reducing agent can be fully mixed when flowing through the SNCR denitration device,and ideal denitration efficiency is achieved. A heat-conducting oil heater pipeline is embedded in a basic mechanism unit, so that a heat-conducting oil heating system is simplified, and part of heatenergy in high-temperature flue gas is obtained for drying of municipal sludge. The whole design structure is simple, the concentration of NOx in the flue gas in front of an SCR device is greatly reduced, energy in the flue gas is obtained with the simple structure for drying of the municipal sludge, and better economic benefits and social benefits can be obtained in two aspects of pollutant emission reduction and municipal waste utilization.

Description

technical field [0001] The invention relates to the field of coal-fired boiler environmental protection technology and waste harmless treatment, in particular to a flue structure for SNCR denitrification of flue gas of pulverized coal boiler and heating sludge drying heat transfer oil. Background technique [0002] In order to meet the national requirements for ultra-low emission of pollutants (such as NOx, etc.) in flue gas emitted by coal-fired units, pulverized coal boilers generally use the selective catalytic reduction (SCR) method for NOx removal. This method has the disadvantages of high construction costs for denitrification devices, There are many problems such as high catalyst consumption, catalyst failure or poisoning, high disposal cost of spent catalyst and great potential harm to the environment. If most of the NOx can be removed before the flue gas enters the SCR device, the denitrification pressure of the downstream SCR device can be effectively relieved, whi...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a flue structure for SNCR denitrification of flue gas of pulverized coal boilers and heating sludge to dry heat transfer oil, which solves the problems of high construction cost and high cost of catalyst use in the flue gas denitration of existing pulverized coal boilers , as well as the complex structure of the dry municipal sludge heat exchanger that exists when coal-fired units are coupled to combust biomass

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