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Small scr flue gas denitrification ammonia injection control system and method

A control method and denitration technology, applied in the field of denitration ammonia injection control system, can solve the problems of difficulty in meeting real-time and precise control, overcomplexity and cost, and lack of a very mature and reliable small-scale SCR denitration control system, achieving simple structure and low cost. , the effect of reducing the content

Inactive Publication Date: 2017-08-15
CHINA UNIV OF MINING & TECH
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  • Description
  • Claims
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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

Method used

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  • Small scr flue gas denitrification ammonia injection control system and method
  • Small scr flue gas denitrification ammonia injection control system and method
  • Small scr flue gas denitrification ammonia injection control system and method

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Embodiment Construction

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] Such as figure 1 As shown, the small-scale SCR flue gas denitrification ammonia injection control system of the present invention includes a main control single-chip microcomputer connected with an upper computer, and the main control single-chip microcomputer is respectively connected with a plurality of functional single-chip microcomputer control modules through a communication cascading module; the model of the main control single-chip microcomputer is STC15F2K60S2

[0025] Such as figure 2 As shown, the multifunctional single-chip microcomputer control module includes a single-chip microcomputer, the model of the single-chip microcomputer is STC15F2K60S2, and the input end of the single-chip microcomputer is connected to multiple smoke detection sensors through a voltage and current conditioning circuit, and the voltage ...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/90B01D53/56
Inventor 昝小舒李宇建马标张海凤冯大川
Owner CHINA UNIV OF MINING & TECH
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