Device and process for realizing denitration reaction and regeneration of SCR catalyst

Abstract

The invention discloses a reactor device for realizing the denitration reaction and regeneration of a selective catalyst reduction (SCR) catalyst. The device comprises a reactor and a circulating pool, wherein a first three-way adapter valve which is connected with a flue gas input pipeline is arranged at an inlet of the reactor; a second three-way adapter valve is arranged between the reactor and the circulating pool; and through a circulating pump, the circulating pool is communicated with a third three-way adapter valve and then is communicated with the first three-way adapter valve. The invention also discloses a process for realizing the denitration reaction and regeneration of the SCR catalyst, wherein the denitration reaction of the SCR catalyst and the regeneration process of the SCR catalyst can be alternately performed in the same reaction device. A regeneration reaction device for the SCR catalyst and a denitration reaction device for the SCR catalyst are fused into one reaction device, the investment cost of equipment is effectively reduced, working procedures and expenses of the detachment and reinstallation of the SCR catalyst are avoided, and tim and labor are saved. Meanwhile, the process greatly reduces the using amount of acid solution and main agent supplement solution in regenerative raw materials.

Description

technical field [0001] The invention relates to the field of air pollution control, in particular to a device and a process for realizing denitrification reaction and regeneration of an SCR catalyst. Background technique [0002] Among the existing flue gas denitrification technologies, the most mature and commercially applied is the selective catalytic reduction method (NH 3 -SCR), which can be expressed as Reactive gas-solid reaction mode. It is well known that medium and high temperature NH 3 -SCR technology, the catalyst is the most important part, and its initial investment accounts for 40-60% of the total investment of the SCR system. Typical commercial SCR catalysts are V containing toxic heavy metal components 2 o 5 -WO 3 (MoO 3 ) / TiO 2 , in the actual coal-fired boiler, because the SCR catalyst is in a high-temperature and high-dust environment for a long time, the presence of alkali (earth) metal potassium K, sodium Na, and calcium Ca in the dust can cause...

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Problems solved by technology

[0005] The above-mentioned patents have achieved good SCR catalyst regeneration effect, but there are still some problems: the Chinese invention patent CN101574671A needs to immerse the SCR catalyst in the regeneration solution, and it can be predicted that the required amount of reagents is large and the investment cost is also high; the Chinese invention Patent CN1768953A and US invention patent US7592283B2 need to be equipped with a special regeneration reaction device, so the catalyst needs to be removed from the denitration reactor first, which is time-consuming and labor-intensive, and the investment cost is high

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