Flue gas denitration equipment for industrial silicon submerged arc furnace

Abstract

The invention discloses flue gas denitration equipment for an industrial silicon submerged arc furnace. The flue gas denitration equipment comprises a treatment box and a treatment pool, wherein a filter screen is arranged in the treatment box, and a first cleaning assembly is arranged on the filter screen; a movable spraying assembly is arranged above the filter screen; an adsorption assembly isarranged above the movable spraying assembly; a placement plate is arranged in the treatment box; a suction ventilator is arranged on the placement plate; an air pipe is connected to the upper portionof the right side wall of the treatment box; the other end of the air pipe is arranged in the treatment pool; an absorption liquid is arranged in the treatment pool; a sewage draining exit is formedin the bottom part of the right side of the treatment box; and a second cleaning assembly is arranged at the bottom part in the treatment box. According to the flue gas denitration equipment, dust influe gas is filtered by means of the filter screen at first, the dust on the filter screen can be cleaned by using the first cleaning assembly, the movable spraying assembly is used for spraying the flue gas, when the flue gas flows, the adsorption assembly is driven to rotate, the adsorption assembly can adsorb small-particle dust and nitre, the absorption liquid absorbs the nitre, and dirt at the bottom part of the treatment box can be removed by using the second cleaning assembly.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification, and in particular relates to flue gas denitrification equipment for industrial silicon submerged arc furnaces. Background technique [0002] At present, there is no mature denitrification technology for flue gas of industrial silicon submerged arc furnaces in China. Due to the unique flue gas characteristics of industrial silicon submerged arc furnaces, mature denitrification technologies (such as selective non-catalytic reduction SNCR process and Selective Catalytic Reduction SCR process) cannot be directly transferred to industrial silicon submerged arc furnace flue gas denitrification. The main reasons are as follows: First, the flue gas temperature of industrial silicon submerged arc furnace is low, extremely unstable, and the range of change is large. There is no stable reaction temperature range suitable for conventional SNCR and SCR denitrification processes. The reaction ...

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Problems solved by technology

If the low-temperature denitrification catalyst that is not yet very mature is used, firstly, the demand for the catalyst is huge, and secondly, the price of the catalyst is extremely high, which makes the entire project investment very staggering, and the company cannot accept it.

If chemical oxidation denitrification is carried out after bag dust removal, there are problems such as low denitrification effect, inability to meet the emission standards stably, and high operating costs. The strong oxidant oxidizes NOx and also oxidizes Sox and other reducing substances in the flue gas. Therefore, the oxidant consumption is very large, resulting in extremely high operating costs, which is unacceptable to the company; at the same time, it is easy to produce secondary pollution, so this method has not been recognized and promoted by the environmental protection department so far.

[0003] China Patent Network Publication No. CN108339397A discloses an industrial silicon submerged arc furnace flue gas denitrification system, including a waste heat boiler and an SCR reactor; the industrial silicon submerged arc furnace is connected with the SCR reactor through a waste heat boiler; There is at least one layer of heat exchanger; there is at least one layer of heat exchanger behind the SCR reactor; although this application can achieve a certain denitrification effect, the cost is relatively high, and the denitrification effect is average

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