Device and method for online regenerating low-temperature denitration catalyst by rotary fixed bed

Abstract

The invention discloses a device for online regenerating a low-temperature denitration catalyst by a rotary fixed bed. The device comprises a fixed bed reactor, an upper end cover, a lower end cover, four air inlet pipes, four air outlet pipes, a driving shaft, a first sealing element, a supporting rack, a motor, a coupler, a rack and a second sealing element, wherein four separators are used for separating the inner space of the fixed bed reactor into four independent reaction zones; the four reaction zones are sequentially a removing zone, a first transition zone, a regeneration zone and a second transition zone; the four air inlet pipes are arranged on the lower end cover, and the four air outlet pipes are arranged on the upper end cover; and each reaction zone respectively corresponds to respective air inlet pipe and respective air outlet pipe. According to the device, a low-temperature denitration catalyst can be online continuously regenerated. The invention further provides an online regeneration method by utilizing the device, and the problem that the low-temperature denitration catalyst is hardly online regenerated in current process of denitrating coal-fired flue gas in the thermal power industry is solved.

Description

technical field [0001] The invention relates to the field of preparation of low-temperature denitration catalysts, in particular to a device and method for on-line regeneration of low-temperature denitration catalysts in a rotary fixed bed. Background technique [0002] my country is the largest coal-consuming country in the world, and coal consumption accounts for about 76% of primary energy consumption. In the process of burning coal and other coal resources, a large amount of soot, sulfur dioxide, nitrogen oxides and other harmful substances will be produced. Among them, nitrogen oxides are one of the main harmful substances that pollute the atmosphere. Its types include: N 2 o 5 , N 2 o 4 , N 2 o 3 , N 2 o 2 , N 2 O, NO, NO 2 , collectively referred to as NOx. The world emits about 50 million tons of NOx into the atmosphere every year, of which about 60% comes from coal combustion flue gas. Coal combustion produces mainly NO and NO 2 , NO accounts for about...

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Problems solved by technology

[0005] technical problem: The technical problem to be solved by the present invention is to provide a device for regenerating low-temperature denitrification catalyst on-line with a rotary fixed bed, which can realize continuous regeneration of low-temperature denitrification catalyst on-line, and also provides a method for on-line regeneration using the device, which solves the problem of At present, in the denitrification process of coal-fired flue gas in the thermal power industry, the low-temperature denitrification catalyst is easily deactivated, and it is difficult to achieve online regeneration.

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