A kind of flue gas backflow double cylinder rotary kiln

Abstract

The invention discloses a double-barrel rotary kiln for flue gas backflow. The double-barrel rotary kiln for flue gas backflow comprises a kiln body which is arranged in an inclined manner, wherein the kiln body comprises an outer barrel and an inner barrel positioned in the outer barrel; the inner barrel and the outer barrel are coaxially and fixedly arranged; one end, close to the kiln tail, of the inner barrel is equipped with a material inlet; the position, at a kiln head, of the outer barrel is equipped with a finished product outlet; a flue gas outlet of the outer barrel is connected to a dust settling chamber; a desulfurization dust collector and a flue gas backflow air blower are connected onto the dust settling chamber; inlet air of the flue gas backflow air blower is hot flue gas of the dust settling chamber; and an air outlet of the flue gas backflow air bower extends into a charge hole of the inner barrel. The double-barrel rotary kiln for flue gas backflow disclosed by the invention has the advantages that hot flue gas introduced out from the outer barrel partially flows back into the inner barrel through the air blower, so that heating for materials in the inner barrel can be realized, polluted gas generated in the inner barrel is forced to move towards a high-temperature section of the kiln head, and polluted air us subjected to sufficient high-temperature incineration disposal, and therefore, pollution of harmful gases such as dioxin and stink is prevented, and waste heat is efficiently utilized.

Description

technical field [0001] The invention relates to a rotary kiln, in particular to a flue gas recirculation double-tube rotary kiln, which belongs to the technical fields of environmental engineering and building materials. Background technique [0002] Rotary kiln is a rotary calcining or sintering kiln, which is widely used in building materials, metallurgy, chemical industry, environmental protection and many other production industries to calcine, incinerate or sinter solid materials. In the field of environmental protection, rotary kilns are usually used for waste incineration, sludge incineration, sludge ceramsite sintering, and contaminated soil cracking and sintering treatment. [0003] At present, most of the rotary kilns used in the domestic environmental protection field are single-cylinder rotary kilns. For example, in the sludge ceramsite sintering process, the ceramsite blank enters the rotary kiln from the inlet of the kiln tail (referring to the feed and exhaus...

AI Technical Summary

Problems solved by technology

Its disadvantages include: (1) a large amount of gaseous pollutants are discharged into the atmosphere without any treatment, including strong carcinogens such as dioxin, and form stench, causing serious air pollution; (2) a large amount of carbon particles enter the smoke (3) Desorption of organic pollutants and pyrolysis gas and carbon particles are not incinerated, resulting in a great waste of energy

The double-barrel rotary kiln produced in Denmark is more famous abroad, but its disadvantage is that it is expensive and difficult to apply to the air pollution control requirements of my country's use of sludge and polluted soil to make ceramsite

Domestic CN 205228189 U proposes a double-barrel rotary kiln flue gas recovery and purification device, but its purpose is to use a double-barrel rotary kiln to reduce the cracking and adhesion of ceramsite raw material due to excessive temperature, and to reduce organic pollution. There is no improvement in the treatment and utilization of material desorption and cracking gas and carbon particles; CN102706140 B proposes a double-barrel rotary kiln pyrolysis garbage process, but its essence is to combine the material precalciner and cement rotary kiln

This process is applied to the co-processing of domestic waste in cement rotary kiln, and high-temperature pyrolysis waste cooled by cement clinker, but it is not suitable for sludge ceramsite sintering and polluted soil ceramsite sintering process

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