Ceramic flue gas treatment system

Abstract

The invention discloses a ceramic flue gas treatment system which comprises a hot blast stove, a kiln, a denitration system, a spray drying tower, a desulfurizing tower and a collaborative denitration device, wherein the denitration system is used for denitrating flue gas of a hot blast stove and a kiln; the spray drying tower is positioned between the hot blast stove and the desulfurization tower along the flow direction of flue gas, and the denitration system is positioned at the upstream of the spray drying tower; the desulfurization tower is used for desulfurizing flue gas of a hot blast stove and a kiln and is a circulating fluidized bed dry desulfurization tower which is low in density and low in bed layer and does not spray water, and the collaborative denitration device is communicated with the desulfurization tower and is used for providing a denitration agent for the desulfurization tower. The denitration device is assisted to provide a denitration agent for the desulfurization tower, so that two-time denitration is realized, the denitration effect is improved, and the ultralow emission standard can be met; the equipment investment and the operation and maintenance cost are also reduced; the collaborative denitration device has no limitation on denitration temperature, dust and the like, and is high in working condition adaptability; and the desulfurization efficiency can be improved, and pollutants such as heavy metals and dioxin can be removed.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment, and more particularly, to a ceramic flue gas treatment system. Background technique [0002] my country is one of the largest producers of ceramics in the world, accounting for about 70% of the world's total. While the ceramic industry has made significant contributions to my country's economic construction, it has also brought serious air pollution problems. At present, the ceramic industry has been included in one of the key industries in the national environmental protection plan, and it is an inevitable trend in the future that ceramic flue gas requires ultra-low emissions. [0003] At present, SNCR denitration is mainly used to treat the flue gas of the hot blast stove. However, due to the denitrification efficiency of SNCR, it cannot meet the national emission standards at high concentrations, and it is more difficult to achieve ultra-low emission standards. After the flue gas...

AI Technical Summary

Problems solved by technology

Specifically, the treatment of the flue gas in the spray tower generally adopts the simple single-alkali method and double-alkali method after dust collection by spraying and settling chambers, cyclone dust collectors, and bag dust collectors, but there are large footprints and operating costs. High, easy to block, secondary pollution of alkali particles leads to excessive particulate matter, easy corrosion of equipment, large water consumption and difficult treatment of chlorine ions enriched in water, many discharge outlets, high management costs, etc.

Moreover, the bag filter is not suitable for dealing with the complex flue gas containing water, acid and tar in the spray tower, and it is easy to cause the dust filter bag to be blocked or even damaged, resulting in the failure of dust removal

If a wet desulfurization device is used, although ultra-low emissions can be achieved, the one-time investment and operating costs are relatively large, and this method must have a wastewater treatment system to deal with highly polluted wet desulfurization wastewater; it cannot effectively remove SO 3 Submicron aerosol particles; after desulfurization, white smoke plume, blue smoke plume, and chimney rain are common at the chimney mouth, and the Ringelmann blackness is difficult to meet the national emission level 1 requirements; the flue gas is saturated wet flue gas, which is strongly acidic , The desulfurization tower, flue, and chimney all need to be anti-corrosion, the investment and operation costs are high, and the risk of fire during construction and maintenance is high.

Moreover, the wet process cannot cooperate with the denitrification process, and only the SNCR / SCR process can be used, which has serious ammonia escape and SO 2 / SO 3 The problem of high oxidation rate, resulting in blockage of air preheater and SO 3 high emissions

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