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Control method of SNCR-SCR coupled denitration system of chain grate-rotary kiln system

A technology of rotary kiln and chain grate machine, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve problems such as system control mechanism to be optimized, achieve good promotion value, convenient source of parameters, and simple operation

Active Publication Date: 2022-01-04
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the system control mechanism needs to be optimized

Method used

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  • Control method of SNCR-SCR coupled denitration system of chain grate-rotary kiln system
  • Control method of SNCR-SCR coupled denitration system of chain grate-rotary kiln system
  • Control method of SNCR-SCR coupled denitration system of chain grate-rotary kiln system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0142] For the SNCR deNOx system set up for the chain grate machine-rotary kiln denitrification system, the initial concentration of NOx before SNCR denitrification (x), the ammonia nitrogen ratio of SNCR ammonia injection (m) and the window temperature of SNCR ammonia injection (t) are mainly considered. The influence of denitrification rate, after data analysis and data curve fitting, determine the formula of SNCR denitrification efficiency:

[0143] (1) Determine the denitration rate y based on the initial concentration of NOx before SNCR denitration x for:

[0144]

[0145] NOx initial concentration x before SNCR denitrification, mg / m 3

Denitrification rate y x

270 26.30％ 407 48.40％ 424 59.00％ 670 67.20％

[0146] Carry out empirical equation: through empirical equation fitting, get:

[0147] the y x =-0.000003x 2 +0.0043x-0.6646.

[0148] (2) Determine the denitrification rate y based on the ammonia nitrogen ratio of SNCR...

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Abstract

The invention discloses a control method of an SNCR-SCR coupled denitration system of a chain grate-rotary kiln system. According to the method, a denitration process based on the SNCR-SCR coupling denitration system of the chain grate-rotary kiln system is optimally designed, and a multi-index test comprehensive weighted scoring method is adopted, so a source, process and tail end control coupled denitration mathematical model is established; and a coupled pellet denitration optimization control method is formed by comprehensively considering the matching relation between process parameters, cost, technical and economic indexes and the like and the optimal denitration rate and the like. By adopting the method, an optimal coupled ultralow NOx emission technology can be formed, denitration efficiency can be effectively ensured on the premise of reducing the consumption of SNCR ammonia, the service life of an SCR denitration catalyst can be prolonged, and the denitration operation cost and investment cost of a system are obviously reduced.

Description

technical field [0001] The invention relates to a chain grate machine-rotary kiln denitrification system, in particular to a control method for a chain grate machine-rotary kiln system SNCR-SCR coupled denitrification system, and belongs to the technical field of chain grate machine flue gas treatment. Background technique [0002] The National Guidance Catalog for Industrial Structure Adjustment (2019 Edition) clearly states that the encouraged technologies include blast furnace high-proportion pellet smelting technology, because the pellet production process has low energy consumption, relatively friendly environment, and the products have good strength, high grade, metallurgical With the advantages of good performance, when applied to blast furnace smelting, it can increase production and save coke, improve ironmaking technical and economic indicators, reduce pig iron cost, and improve economic benefits. From 2015 to 2018, my country's pellet production increased from 128...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/56B01D53/78B01D53/86B01D53/75B01D53/88
CPCB01D53/56B01D53/78B01D53/8628B01D53/75B01D53/88B01D2258/0283B01D2251/2062
Inventor 胡兵曾辉刘臣魏进超
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD