Control device for reducing escaped ammonia in denitration process

Abstract

The invention discloses a control device for reducing escaped ammonia in a denitration process. The control device comprises an instant inlet ammonia spraying and distribution control device, wherein the instant inlet ammonia spraying and distribution control device is composed of a main pipe, a plurality of branch pipes, ammonia spraying electric valves, flue pipes, a plurality of ammonia spraying valves, and NH and NOX detectors, wherein one end of each branch pipe is communicated onto the main pipe; the ammonia spraying electric valves are arranged on the plurality of branch pipes respectively; the flue pipes are communicated with the other ends of the plurality of branch pipes; the ammonia spraying valves are arranged on side surfaces of the flue pipes and two opposite end faces of the flue pipes; the NH and NOX detectors are arranged on the plurality of ammonia spraying valves. The control device disclosed by the invention has the beneficial effects of simple structure and high practicability.

Description

technical field [0001] The invention relates to a method for reducing ammonia escape, in particular to a control method for reducing denitration escape ammonia. Background technique [0002] The main source of nitrogen oxides in the atmosphere is fuel, of which nearly 70% comes from the direct combustion of coal. my country is a country with coal as the main energy source, and the coal consumption in thermal power plants accounts for more than half of my country's total coal consumption. According to statistics, in 2000, the total emission of NOx in my country was about 18.8 million tons, of which the emission of nitrogen oxides from thermal power plants was 4.96 million tons. According to the current emission level, it is estimated that by 2020, the nitrogen oxides emitted by thermal power in my country will reach more than 10 million tons. The increase of NOx concentration will increase the oxidative property of the atmosphere, leading to a series of urban and regional e...

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Problems solved by technology

[0004] At present, SCR flue gas denitrification systems at home and abroad basically use laser method, FTRI method and indirect method (extracting flue gas, measuring the NO content in the sample gas that passes through the catalyst and not passing through the catalyst) to monitor the amount of ammonia slip from the denitrification system online. The online ammonia escape monitoring of the SCR denitrification systems that have been put into operation in various regions of the country is not ideal, and there is no mature and reliable detection method in China at present

The detection of ammonia slip is immature, and the control of ammonia slip is not ideal. Most power plants have considerable economic losses due to the poor control of ammonia slip in the denitrification system. It can be said that ammonia slip is currently the most troublesome thing for power plants.

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