Wet-process multistage washing multi-pollutant purifying equipment integrated system for coal-fired boiler flue gas

Abstract

The invention relates to a wet-process multistage washing multi-pollutant purifying equipment integrated system for coal-fired boiler flue gas. The purifying equipment integrated system includes: a flue gas oxidizing section, a washing column and a gas-liquid separation device. The washing column is a multi-phase pneumatic cyclone flow washing column. A washing agent nozzle is disposed at a flue gas inlet. A plurality of water film and curtain forming devices are disposed inside a column body and under the washing agent nozzle. Each water film and curtain forming device includes a circular cone shaped liquid homogenizing cap. A plurality of cyclone flow sheets are disposed under the liquid homogenizing cap and on a side wall of an inner core cylinder. The cyclone flow sheets are arranged longitudinally and inclinedly and are annularly distributed on the side wall of the inner core cylinder. In the system, a flue gas oxidization section, the multi-phase pneumatic cyclone flow washing column and a dewatering and demisting column are continuously combined to form the purifying apparatus in a multi-stage manner, wherein the absorption and purification efficiency is improved since a multiple water film and curtain is formed in the washing column.

Description

technical field [0001] The invention relates to the field of coal-fired boiler flue gas purification, in particular to an integrated system of coal-fired boiler flue gas wet multi-stage washing and multi-pollutant purification equipment. Background technique [0002] Coal-fired boilers produce a large amount of dust, SO 2 The coal-fired flue gas of nitrogen oxides is extremely polluting to the air, and the purification of coal-fired boiler flue gas is an urgent problem to be solved. At present, the country's current "Emission Standards of Air Pollutants for Boilers" clearly stipulates that boilers in key areas are subject to special emission limits for air pollutants, while existing coal-fired heating boilers in northern regions have been put into use for a long time due to flue gas environmental protection facilities. The technology is backward and the efficiency is not high, and it is facing the problem that the smoke emission is not up to standard. Commonly used flue ga...

AI Technical Summary

Problems solved by technology

At present, the country's current "Emission Standards of Air Pollutants for Boilers" clearly stipulates that boilers in key areas are subject to special emission limits for air pollutants, while existing coal-fired heating boilers in northern regions have been put into use for a long time due to flue gas environmental protection facilities. The technology is outdated and the efficiency is not high, facing the problem that the smoke emission is not up to standard

Commonly used flue gas dust removal technologies include mechanical cyclone centrifugal dust removal, electrostatic dust removal, filter bag dust removal, etc. Desulfurization technologies include furnace calcium spraying method, lime / limestone-gypsum method, double alkali method, rotary spray drying method, etc., denitrification technology There are Selective Catalytic Reduction (SCR) and Selective Non-Catalytic Reduction (SNCR). The above methods have good removal efficiency for the corresponding pollutants when used independently, but for particulate matter, sulfur dioxide, nitrogen oxides, etc. For coal-fired boiler flue gas with multiple pollutants, if the above methods are used in combination, the back-end environmental protection system is relatively complex and large, the transformation cost is high, the operation cost is high, and the removal efficiency of various pollutants is reduced, and the area occupied Large, especially for heating companies located in inner cities, the space available for renovation is limited

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