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Full-load precise ammonia spraying system with functions of online speed field leveling and concentration field measuring

A technology of concentration measurement and concentration field, applied in the field of environmental treatment, to achieve the effect of improving denitrification efficiency, reducing ammonia injection volume and ammonia escape rate

Inactive Publication Date: 2018-08-17
南京新瓦特智控科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Purpose of the invention: The purpose of the invention is to address the deficiencies of the prior art, to provide a full-load precision ammonia injection system for online velocity field leveling and concentration field measurement, and to solve the problem that the existing SCR denitrification system cannot be based on the concentration and flow rate of NOx at the inlet of the catalyst layer. The problem of on-demand ammonia injection, under the demand of frequent peak shaving in power plants, can reduce the amount of ammonia injection and ammonia slip rate as much as possible under full load conditions, and can make the NOx concentration at the tail of the flue reach the standard smart ammonia injection system

Method used

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  • Full-load precise ammonia spraying system with functions of online speed field leveling and concentration field measuring
  • Full-load precise ammonia spraying system with functions of online speed field leveling and concentration field measuring
  • Full-load precise ammonia spraying system with functions of online speed field leveling and concentration field measuring

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Embodiment 1

[0028] Example 1: Taking the SCR denitrification system of a 660MW supercritical unit in a power plant in Jiangsu as an example, there are currently problems with SCR: (1) NOx flow field at the outlet of SCR: There are many points of serious uneven distribution of NOx in both north-south and east-west directions ( The deviation exceeds 50%); (2) In some working conditions, there are multiple points of ammonia escape exceeding 3ppm; (3) The air preheater has been severely blocked many times, and it is forced to implement online water flushing of the air preheater during operation; (4) After low-level transformation, the above-mentioned problems are more prominent.

[0029] Since the SCR denitrification system of the power plant is divided into side A and side B, the configurations on both sides are exactly the same. Taking side A as an example, according to the content of the present invention, it is modified and installed with a full-load precision ammonia injection system bas...

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Abstract

The invention discloses a full-load precise ammonia spraying system with functions of online speed field leveling and concentration field measuring. The full-load precise ammonia spraying system comprises a zone flue gas speed measuring device and a zone NOx (oxynitride) concentration measuring device corresponding to a vertical flue zone between a first corner fixed flow guide plate and a primaryammonia spraying grid, and a secondary micro-ammonia spraying and supplementing system, a zone speed measuring device, and a zone ammonia and nitrogen integrated concentration measuring device whichare arranged from top to bottom corresponding to each zone between a flow equalizer and a catalyst layer; a zone ammonia and nitrogen integrated concentration measuring device is arranged corresponding to each zone between the catalyst layer and an exit flue; a zone flue gas speed measuring device, a zone NOx concentration measuring device, a zone speed measuring device and the zone ammonia and nitrogen integrated concentration measuring device are used for respectively transmitting the measuring data to an input port of a control unit, and the control unit is used for generating a control adjusting signal, and sending to a primary ammonia spraying grid, a dynamic flow field leveling flow guide device, and a secondary micro-ammonia spraying and supplementing system via an output end. The full-load precise ammonia spraying system has the advantages that the speed field in front of the catalyst can be flexibly leveled according to the characteristics of the flue gas flow field formed bythe combination of different coal types, different loads and different combustors.

Description

technical field [0001] The invention relates to a full-load precise ammonia injection system for online velocity field leveling and concentration field measurement, and belongs to the technical field of environmental treatment. Background technique [0002] The newly revised "Emission Standards of Air Pollutants for Thermal Power Plants" has set very strict requirements on NOx emissions, requiring NOx emission standards to be within 50 mg / Nm3. Only relying on low-nitrogen combustion cannot meet the emission target requirements. Therefore, controlling NOx after combustion, That is, installing a denitrification device at the tail of the flue has become an inevitable choice for coal-fired power plants. Among denitrification technologies, SCR has become the main choice for coal-fired power plants due to its high denitrification efficiency and mature technology. However, due to the strong nonlinearity and large hysteresis of the existing SCR system itself, there is a problem tha...

Claims

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Application Information

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IPC IPC(8): B01D53/90B01D53/56G05D27/02
CPCB01D53/8653B01D53/90B01D2251/2062B01D2258/0283G05D27/02
Inventor 王丹秋朱曙光李良春赵厚任吴艳曹纯建
Owner 南京新瓦特智控科技有限公司
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