Ammonia water mixer for new boiler denitrification

Abstract

The invention discloses a new type of ammonia water mixer for boiler denitrification, which is designed with the concept of "cut circle", that is, according to the size of the boiler, the original nitrogen oxide discharge, the local environmental protection requirements and other related indicators, in the mixer tank A certain number of spray guns are arranged on the body, and the spray guns are installed at a certain angle, and high-concentration ammonia water and desalinated water pass through the spray guns at intervals. Since the high-concentration ammonia water and desalted water have a certain pressure and speed under the action of their respective pumps, a specific tangential circle is formed in the mixer tank, and the tangential circle direction of the adjacent layer is opposite, so as to achieve a good mixing effect and eliminate The problem of mutual pressure. In addition, a switch is provided on the spray gun of the mixer, and the boiler variable load denitrification adjustment can be realized by closing some of the spray guns of the mixer symmetrically and at intervals. The device of the invention has good effect, low equipment cost, convenient installation and use, and solves the problem of mutual pressure between high-concentration ammonia water and demineralized water in the mixer and the problem of denitrification that cannot be adapted to boiler load changes.

Description

technical field [0001] The invention belongs to the field of denitrification of coal-fired boilers, and relates to a denitrification device using ammonia water as a reducing agent, in particular to equipment for adjusting the mixed concentration of ammonia and water. Background technique [0002] my country is rich in coal resources, and coal occupies a large share in China's energy structure. According to relevant reports, in 2010, my country's thermal power generation accounted for about 75% of the total power generation, hydropower accounted for about 22%, nuclear power accounted for 1.5%, wind power and solar energy accounted for about 1.5%, and coal-fired units accounted for 90% of the total thermal power generation. about. The consequence of a large amount of coal-fired power generation is high pollution, such as the current smog, acid rain, and the hole in the ozone layer. The emergence of these problems has a lot to do with coal-fired power generation. The governme...

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Problems solved by technology

[0004] The present invention is proposed based on the experience and problems of many engineering projects, and is dedicated to solving the problem that the ammonia water mixer does not have the function of adjusting the ammonia water concentration to adapt to variable loads in the prior art system that uses ammonia water as a reducing agent for denitrification, and the ammonia water mixer The problem of mutual topping of pressure and discontinuous injection of ammonia water

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