Small scr flue gas denitrification ammonia injection control system and method

Abstract

A small SCR flue gas denitrification ammonia injection control system and method are suitable for use on small coal-fired furnaces. Including the main control single-chip microcomputer connected with the host computer, the main control single-chip microcomputer is respectively connected with multiple functional single-chip microcomputer control modules through the communication cascading module; the multi-functional single-chip microcomputer control module includes a single-chip microcomputer, and the single-chip microcomputer is connected to multiple smoke detection sensors through a voltage and current conditioning circuit , the input end of the single-chip microcomputer is also connected with a touch screen display input module and a communication cascade module, the output end of the single-chip microcomputer is respectively connected with a steam regulating valve and a liquid nitrogen regulating valve through a drive circuit, and multiple sets of relay input modules and relays are connected to the single-chip microcomputer output module. Use the flue gas detection sensor to detect the NOx content of the coal-fired furnace, and increase the NH when the NOx emission concentration is too high 3 output, when the NOx emission concentration is normal to maintain NH 3 Smooth output. The utility model has the advantages of simple structure, convenient use, good denitrification effect and low cost.

Description

technical field [0001] The invention relates to a denitrification ammonia injection control system and method, and is especially suitable for a small SCR flue gas denitrification ammonia injection control system and method used on a small coal-fired furnace. Background technique [0002] With the state on NO X The management of (nitrogen oxide) emissions is becoming more and more stringent, and accurate and controllable denitrification technology is becoming more and more important in practical applications. SCR (Selective Catalytic Reduction) denitrification technology is currently the most widely used and highly effective denitrification technology among various denitrification technologies. In my country, in the current denitrification technical transformation of power plants, SCR denitrification technology is mostly used, and its denitrification efficiency can reach more than 80%. SCR technology mainly uses the reducing agent NH 3 with NO X The reaction produces harm...

AI Technical Summary

Problems solved by technology

[0005] 2. The existing measurement method of the flue gas volume at the flue gas outlet has large errors and delays, and it is difficult to meet the requirements of real-time and precise control

For small coal-fired boilers, the general DCS (distributed computer control) system exceeds expectations in terms of complexity and cost.

At present, there is no very mature and reliable small SCR denitrification control system

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