Tunnel kiln waste gas treatment system and method

Abstract

The invention discloses a tunnel kiln waste gas treatment system and method. The tunnel kiln waste gas treatment system comprises a drying kiln and a roasting kiln, wherein kiln bodies of the drying kiln and the roasting kiln are independent of each other; a roasting side gas conveying channel for allowing a gas mixture in the roasting kiln to enter the drying kiln, and a drying side gas conveyingchannel for allowing a gas mixture in the drying kiln to enter the roasting kiln are formed between the drying kiln and the roasting kiln; and the drying side gas conveying channel is provided with awashing unit for conducting spray washing on the corresponding gas mixture, and a condensing unit for conducting gas and water separation on steam after washing, and separated gas enters the roastingkiln through the drying side gas conveying channel. High-value repeated recycling of the waste gas between the roasting kiln and the drying kiln is reliably achieved, thus 'zero' discharge of the waste gas in a tunnel kiln is achieved, meanwhile the production scale of the tunnel kiln is not limited, energy conservation and consumption reduction can further be achieved, overall economic value andenvironmental protection value are remarkable, and market application prospects and social benefits are good.

Description

technical field [0001] The invention relates to an industrial waste gas treatment technology, in particular to a tunnel kiln (especially brick kiln) waste gas treatment system and treatment method. Background technique [0002] Tunnel kiln is made of refractory materials, thermal insulation materials and building materials, and is equipped with kiln cars and other vehicles inside. It is similar to a tunnel. It is mainly used for firing refractory materials, ceramics and sintered bricks. . Taking the brick kiln for firing sintered bricks as an example, the exhaust gas treatment of the tunnel kiln is described in detail as follows. [0003] Sintered bricks are made of clay, shale, coal gangue or fly ash as raw materials, and are made by billeting and high-temperature roasting. The whole molding process includes billet making, drying and roasting. The adobes are dried and dehydrated, and the roasting is achieved by sintering the dried adobes at a high temperature of 900-1100°...

AI Technical Summary

Problems solved by technology

In response to this, many brick kilns have changed the traditional chimneys for exhaust gas discharge into discharge towers, and installed environmental protection treatment systems in the discharge towers, so that the waste gas generated by brick kilns can be emptied through the environmental protection treatment of the discharge towers. Although this waste gas treatment method is relatively direct Venting has made great technological progress and good environmental protection, but it still has a large environmental pollution problem, which is mainly reflected in: because brick kilns will produce a large amount of waste gas during production, especially large brick kilns, so that it will enter the discharge tower The flow of exhaust gas in the exhaust tower is large, and the environmental protection treatment system in the discharge tower is difficult to achieve effective environmental protection treatment of the exhaust gas passing by. The exhaust gas that has not been completely environmentally friendly treated is discharged through the discharge tower, and the discharged gas is carried and is not friendly to the environment. Harmful substances (including dust, sulfur, nitrate, fluorine, etc.) will pollute the environment; if we want to enhance the environmental protection effect of the discharge tower on the waste gas, we need to control the flow of waste gas entering the discharge tower, so we need to limit the production scale of the brick kiln , will obviously affect the production efficiency of the brick kiln. Even so, the gas emptied by the discharge tower always carries harmful substances that are not friendly to the environment (including dust, sulfur, nitrate, fluorine, etc.), which will still pollute the environment

[0006] To sum up, based on the particularity of tunnel kiln production including brick kilns and the inadequacy of existing tunnel kiln waste gas treatment technology, the waste gas produced by tunnel kiln production will inevitably pollute the surrounding environment and fail to meet environmental protection requirements. technical requirements, urgently need to make technical breakthroughs

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