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An SCR denitrification device, its ammonia injection adjustment device and its ammonia injection adjustment method

An adjustment method and a technology for adjusting devices, which are applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve problems such as air preheater clogging, electrostatic precipitator line dust accumulation, etc., to improve quality, reduce investment and maintenance Effort, increased reliability and effect of adjustment accuracy

Active Publication Date: 2019-03-29
浙江兴核智能控制技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When factors such as changes in the type of coal burned, changes in the grinding combination, and adjustment of the burner lead to significant changes in the NOx concentration distribution and flow field at the SCR inlet, the implementation of ultra-low emission standards will greatly increase the number of places where the ammonia-nitrogen molar ratio exceeds 1. The escape rate will far exceed the allowable value (<3ppm), which will easily cause adverse effects such as air preheater blockage and electrostatic precipitator line dust accumulation.

Method used

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  • An SCR denitrification device, its ammonia injection adjustment device and its ammonia injection adjustment method
  • An SCR denitrification device, its ammonia injection adjustment device and its ammonia injection adjustment method
  • An SCR denitrification device, its ammonia injection adjustment device and its ammonia injection adjustment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Such as figure 2 The ammonia injection adjustment device for the SCR denitrification device shown includes an ammonia injection main pipe; the ammonia injection main pipe is branched into three ammonia injection partition main pipes, and each ammonia injection partition main pipe is branched into three ammonia injection branch pipes; each ammonia injection branch pipe Ammonia injection manual regulating valves are provided on each of them, each ammonia spraying partition main pipe is respectively equipped with ammonia spraying partition regulating valve, and the ammonia spraying main pipe before branching is equipped with an ammonia spraying total amount regulating valve.

[0063] Such as image 3 The SCR denitrification device shown includes the denitrification device body, the denitrification device body includes the SCR flue inlet and the SCR flue outlet, and also includes the above-mentioned SCR denitration device ammonia injection adjustment device and SCR outlet ...

Embodiment 2

[0080] It is basically the same as Example 1, except that the multi-point mixed sampling device also includes a hot air blowback subsystem, and the gas source of the hot air blowback subsystem is hot primary air; the hot air blowback subsystem includes at least a blowback pipeline, The blowback control valve and the blowback isolation valve, the blowback isolation valve is set on the flue gas mixing section, the blowback control valve is set on the backflush pipeline, the backflush pipeline is connected to the flue gas mixing section, and is located upstream of the blowback isolation valve.

Embodiment 3

[0082] It is basically the same as Example 1, the difference is: on the sampling branch pipe of the multi-point mixed sampling device and upstream of each sampling control valve, a sampling bypass branch pipe is respectively connected, and each bypass branch pipe is collected into the sampling bypass main pipe The NOx concentration is actually measured on the sampling bypass main pipe, and the original CEMS system is used to measure the NOx concentration on the sampling bypass main pipe, which is used as the main parameter for the control of the total ammonia injection control valve, thereby further improving the efficiency of the total ammonia injection control. quality.

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Abstract

The invention discloses an SCR denitration device as well as an ammonia spraying adjustment device and ammonia spraying adjustment method thereof. The ammonia spraying adjustment device for the SCR denitration device comprises an ammonia spraying mother pipe; the ammonia spraying mother pipe is divided into more than two ammonia spraying sub-mother pipes; each ammonia spraying sub-mother pipe is divided into more than two ammonia spraying branch pipes; each ammonia spraying branch pipe is provided with an ammonia spraying manual regulation valve; an ammonia spraying sub-regulation valve is arranged on each ammonia spraying sub-mother pipe; and an ammonia spraying total regulation valve is arranged on the upstream section of the ammonia spraying mother pipe before division. In the invention, the NOx average concentration and NOx concentration distribution at the SCR exit are monitored, and thus the quality of ammonia spraying control is comprehensively improved; and the design of the whole system lays emphasis on high integration and has remarkable advantages of investment saving, high reliability and the like.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification in large-scale coal-fired power plants, and in particular to an SCR denitrification device, an ammonia injection adjustment device and an ammonia injection adjustment method thereof. Background technique [0002] At present, large coal-fired power plants generally use SCR denitrification devices to reduce the concentration of NOx emissions in flue gas. SCR utilizes NH 3 The reduction characteristics of NOx, under the action of the catalyst, NOx is reduced to N which is harmless to the environment 2 and H 2 O. In the actual operation process, the control of the amount of ammonia injection is particularly critical. Increasing the amount of ammonia injection is beneficial to reduce the concentration of NOx emissions, but the ammonia slip rate will increase accordingly, which will easily cause the downstream air preheater to be blocked and corroded due to the deposition of ammonium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/90B01D53/86B01D53/56
CPCB01D53/8631B01D53/90B01D2258/0283
Inventor 韦红旗石伟伟何长征李文霞
Owner 浙江兴核智能控制技术有限公司