Flow mixing device, SCR denitration system and denitration system flue flow field homogenization method

Abstract

The invention provides a flow mixing device, which belongs to the technical field of SCR denitration of a coal-fired boiler of a thermal power plant, The flow mixing device comprises a swing flow deflector, comprising a first flow deflector and a second flow deflector which are arranged on two sides of a flue center line as well as are respectively and rotatably connected with a flue side wall, aflue is divided into several sub-flues by the first flow deflector and the second flow deflector; and an angle adjusting mechanism is respectively connected to the first flow deflector and the secondflow deflector for driving the first flow deflector or the second flow deflector to rotate. The invention also provides a SCR denitration system and a denitration system flue flow field homogenizationmethod. The flow mixing device, the SCR denitration system and the SCR denitration system flue flow field homogenization method solve the technical problem that the installation and fixing of the flow deflectors in the flue flow field cannot guarantee the uniformity of the flow field in the prior art.

Description

technical field [0001] The invention belongs to the technical field of SCR denitrification of a coal-fired boiler in a thermal power plant, and more specifically relates to a mixed flow device, an SCR denitrification system and a method for uniform flow field of a flue of the denitrification system. Background technique [0002] Selective catalytic reduction technology (SCR) is currently the most mature and reliable flue gas denitrification method in coal-fired power plants. It uses ammonia, carbon monoxide, etc. as reducing agents in the presence of a catalyst to reduce NO in the flue gas to nitrogen, water or carbon dioxide. Most of the SCR denitrification systems of coal-fired boilers in my country are post-installed. The installation space of the unit was not considered at the initial stage of design. After the flue gas is led out of the economizer outlet, it continuously passes through multiple 90° elbows and encounters the flue space. The sharp change in size makes the...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a mixed flow device, SCR denitrification system and a method for uniform flow field in the flue of the denitrification system, aiming to solve the technical problem that only installing a fixed deflector in the flow field of the flue cannot guarantee the uniformity of the flow field

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