Flue gas denitrating method and flue gas denitrating apparatus with special rectifier cell

Abstract

The invention relates to a smoke gas denitration method and a device provided a special rectifying element; the flue of a tapered section and the horizontal flue of an entrance section on the top of a reactor are communicated successively; at least one catalyzator layer is arranged inside the reactor; the invention is characterized in that at least one rectifying steel tube perpendicular to a smoke gas flow direction is fixed on the head plate of the flue of the tapered section; space between the adjacent two rectifying steel tubes is larger the diameter of the rectifying steel tube. The special rectifying element of the invention has the advantages of simple structure and fixation, and convenient installation and adjustment. The invention adopts a smoke gas rectifying device with simple structure, high efficiency and easy adjustment to distribute evenly the flow field of the smoke gas in a SCR system and make the smoke gas and the catalyzator contacted fully and evenly so as to improve denitration efficiency. The smoke gas denitration method and the device provided the special rectifying element can be applied broadly to a selective catalytic reduction smoke gas denitration system in a heat power plant to adjust the flow field of the smoke gas and guarantee uniform distribution of the flow field in a SCR reactor under various working conditions.

Description

technical field [0001] The invention relates to a fluid rectification method and its device, in particular to a flue gas rectification method and its device in a flue gas denitrification system. Background technique [0002] During the combustion process of the electric boiler, NO and NO will be produced 2 Nitrogen oxides (hereinafter referred to as NOx) as the main component are exhausted to the atmosphere with flue gas, and NOx is a substance harmful to the environment. Selective catalytic reduction (SCR) technology is currently the most widely used denitrification technology in industry, such as figure 1 As shown, in a negative pressure reactor with steel structure, the reducing agent NH is injected into the flue gas 3 , after the mixed flue gas enters the flue in the vertical section, it enters the horizontal flue at the SCR inlet after being turned by the elbow, and the flow channel becomes wider after turning in the tapered section above the SCR reactor, and reaches ...

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Problems solved by technology

[0006] However, this method has some shortcomings. Due to the complex structure of the guide vane, multiple parameters such as the length, radian, angle, and quantity of the guide vane need to be adjusted according to different flue gas conditions. The installation and positioning requirements are very high, and it is not easy Accurate, affecting the installation quality, thus making the reactor structure complex

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