Coal-fired flue gas treatment apparatus and method by baking soda dry desulfurization

Abstract

The invention relates to coal-fired flue gas treatment, and provides coal-fired flue gas treatment apparatus by baking soda dry desulfurization. The coal-fired flue gas treatment apparatus comprises acoal-fired gas boiler; a flue gas outlet of the coal-fired boiler communicates with a chimney through a flue gas purification treatment assembly; a coal economizer and an air preheater are arranged in the coal-fired boiler; the coal-fired flue gas treatment apparatus also comprises a baking soda adding device; and the baking soda adding device comprises a baking soda bin and a spraying pipe, wherein a feeding port of the spraying pipe communicates with the baking soda bin, a discharging port of the spraying pipe communicates with a flue of the coal-fired gas boiler, and the discharging port is positioned between a flue gas outlet of the coal economizer and a flue gas outlet of the coal-fired gas boiler. The invention further provides a coal-fired flue gas treatment method by baking soda dry desulfurization. According to the invention, baking soda is sprayed into the flue of the coal-fired gas boiler, the baking soda can be effectively decomposed by high temperature in the flue of thecoal-fired gas boiler, and sodium carbonate generated after decomposition can fully reacts with sulfur dioxide in the flue gas under a proper temperature condition, so that a purpose of desulfurization is achieved, and baking soda desulfurization efficiency can be guaranteed.

Description

technical field [0001] The invention relates to coal-fired gas flue gas treatment, in particular to a coal-fired gas flue gas treatment device and method using baking soda dry desulfurization. Background technique [0002] In recent years, many iron and steel enterprises have begun to gradually strengthen the recovery of surplus gas resources (such as blast furnace gas, converter gas, coke oven gas, etc.) for use in gas-fired boiler generator sets. According to the National Pollutant Emission Standard GB13223-2011 "Emission Standard of Air Pollutants for Thermal Power Plants", the emission concentration of sulfur dioxide from gas-fueled boilers or gas turbine units is not higher than 35mg / Nm 3 , so the flue gas desulfurization treatment of gas-fired boilers is particularly important. Although the use of baking soda dry desulfurization is currently disclosed, it is difficult for baking soda desulfurizers to effectively carry out chemical reactions in the flue to adsorb sulfu...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a coal-fired gas flue gas treatment device and method using baking soda dry desulfurization, aiming to solve the problem that the existing coal-fired gas flue gas using baking soda has a poor desulfurization effect

Images