Design method of guide plate of reducing flue of SCR (selective catalytic reduction) de-nitration device

Abstract

The invention provides a design method of a guide plate of a reducing flue of an SCR (selective catalytic reduction) de-nitration device. According to the method, the flue gas running through the reducing flue is divided by using the guide plate; the guide plate is arranged inside a horizontal reducing flue of the SCR de-nitration device; the guide plate changes the moving direction of fly ash particles in the reducing flue to avoid the local gathering of the fly ash particles; according to the length, inlet width and outlet width of the reducing flue, the structural parameter and the mounting position of the guide plate in the reducing flue are further determined; the structure parameter of the guide plate comprises number (n) of the guide plates, length (L) of the guide plate, distance (d) between the guide plates and included angle (theta) between the guide plate and the cross section of the inlet of the reducing flue. Due to the adoption of the design method, the evenness of the distribution of the fly ash particles is improved simultaneously when the distribution evenness of the flue gas speed can be met, and therefore, the partial gathering of the fly ash particles in the catalysis layer and the flush damage to a catalyst are avoided.

Description

technical field [0001] The invention relates to a design method for a variable-diameter flue guide plate of an SCR denitrification device aimed at adjusting the distribution of fly ash particles, and belongs to the technical field of thermal power environmental protection. Background technique [0002] Flue gas denitrification methods include selective catalytic reduction (SCR-Selective Catalytic Reduction) technology, selective non-catalytic reduction (SNCR) technology, SNCR / SCR combined flue gas denitrification technology, liquid absorption method, etc. Among the existing thermal power flue gas denitrification methods, SCR denitrification has become the most widely used flue gas purification technology due to its advantages of high denitrification efficiency, good selectivity, and low operating temperature. The main principle of the selective catalytic reduction method is to use ammonia (NH 3 ) and nitrogen oxides (NO x ) at V 2 o 5 / WO 3 / TiO 2 or V 2 o 5 / MoO 3 ...

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Problems solved by technology

However, this paper did not analyze and study the distribution of fly ash particles inside the device, and the design of the corresponding deflector did not take this factor into consideration.

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