Method for improving denitration rate of SCR (Selective Catalytic Reduction) denitration system of power station boiler

A technology of power plant boiler and denitration rate, applied in the field of SCR denitration system of coal-fired power station, can solve the problems of affecting the denitration effect of the system and the harm of economic and stable operation.

Inactive Publication Date: 2014-01-22
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

This will affect the overall denitrification effect of the system an

Method used

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  • Method for improving denitration rate of SCR (Selective Catalytic Reduction) denitration system of power station boiler
  • Method for improving denitration rate of SCR (Selective Catalytic Reduction) denitration system of power station boiler
  • Method for improving denitration rate of SCR (Selective Catalytic Reduction) denitration system of power station boiler

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Embodiment Construction

[0031] The present invention is described further below by embodiment.

[0032] The embodiment of the present invention conducts field operation optimization test research on the SCR device of a 600MW unit in a certain power plant.

[0033] 1. Optimized test and measuring instruments for on-site operation

[0034] (1) NO x and O 2 Measurement

[0035] Field test NO x The measuring instrument is infrared NO x Analyzer, O 2 The measuring instrument is usually a paramagnetic oxygen meter. Due to the large area of ​​the SCR reactor, it is usually necessary to adopt such image 3 The automatic measurement system shown.

[0036] by NOx and O 2 Simultaneous measurement of NOx data converted to 6%O 2 benchmark data.

[0037] (2) NH 3 Measurement

[0038] Field Trial NH 3 The measurement can be in accordance with the EPAmethodCTM027 standard, the sampling system such as image 3 shown.

[0039] 2. Analysis and discussion on field operation optimization practice

[0040...

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Abstract

The invention discloses a method for improving the denitration rate of an SCR (Selective Catalytic Reduction) denitration system of a power station boiler. The method comprises the following steps: (1) measuring concentration distribution of NOx at the outlet of an SCR denitration reactor; (2) calculating the unevenness Cv of concentration distribution of NOx according to the measuring result in the step (1); (3) when Cv is greater than 20%, adjusting the valve opening in an area corresponding to an ammonia injection grid according to the concentration distribution of NOx at the outlet of the SCR denitration reactor; (4) repeating the steps (1) to (3) until Cv is less than or equal to 20%. Through optimization and adjustment by the invention, the evenness of distribution of NOx at the outlet of the SCR denitration reactor is remarkably improved, and the relative standard deviation of NOx is reduced from 46.4% to 14.8%. On the premise of ensuring that ammonia escape does not exceed standard, the denitration rate is improved from 77% to 83%. The method disclosed by the invention has important guiding meaning and engineering application value to safe, efficient and stable operation of the SCR denitration system of the power station boiler.

Description

technical field [0001] The invention relates to an SCR denitrification system of a coal-fired power station, in particular to a method for improving the denitrification rate of the SCR denitrification system of a power station boiler. Background technique [0002] my country is a country where coal is the main primary energy source. Coal accounts for more than 60% of total energy consumption, and coal consumption for power generation accounts for 50% of coal consumption, and this trend will continue for a long time. In 2005, the national nitrogen oxide emission was 19.1×106t, and the NO in my country’s atmospheric environment x The concentration is much higher than other countries and regions, among which the contribution rate of power plants is 43%. It can be seen that coal-fired power generation is one of the main sources of air pollutant nitrogen oxides in my country. Since the "Twelfth Five-Year Plan", the Chinese government has attached great importance to the control...

Claims

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Application Information

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IPC IPC(8): B01D53/90B01D53/56
Inventor 李德波
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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