Hazardous waste rotary kiln incineration air supply method

Abstract

The invention relates to the technical field of hazardous waste incineration, and particularly discloses a hazardous waste rotary kiln incineration air supply method. The method is achieved through animproved air supply structure. The air supply structure comprises a supporting frame, a rotary drum and a kiln head cover. The kiln head cover is cylindrical, a main air hole and an auxiliary air hole are formed in the side wall of the kiln head cover, the main air hole is located in the top of the kiln head cover, the main air hole and the auxiliary air hole are not located in the same circumferential line of the kiln head cover, the main air hole is close to the rotary drum, and the auxiliary air hole is away from one side of the rotary drum. When the temperature in the rotary drum rises toa preset value, air is supplied into the kiln head cover from the main air hole and the auxiliary air hole, and the air speeds of the main air hole and the auxiliary air hole are consistent. Throughmodel simulation, the air excess coefficient of hazardous waste incineration is controlled to range from 0.8 to 1.0 to adjust the air supply amount, the rotary turbulence flow field of the scheme is obtained through calculation, the hazardous waste incineration heat ignition loss rate of a rotary kiln can be lower than 3%, thus, the scheme can guarantee the much lower heat ignition loss rate on the premise that the low excess coefficient is guaranteed, and the combustion rate is increased.

Description

technical field [0001] The invention relates to the technical field of hazardous waste incineration, in particular to an air supply method for hazardous waste rotary kiln incineration. Background technique [0002] A large amount of domestic garbage and waste are produced every day in the country. Most of these domestic garbage and waste contain toxic and harmful substances. If they are discharged indiscriminately, they will pollute the environment. Therefore, these hazardous wastes must be treated before they can be discharged. At present, the rotary kiln is mainly used to incinerate hazardous waste. The thermal ignition loss rate of the ash after hazardous waste incineration is the most powerful basis for judging whether the rotary kiln is normal or not, and can calculate the completion status of incineration. [0003] Usually, if the air passing into the rotary kiln cannot be sufficiently diffused, the formed flow field is not fully covered, and the moving speed along th...

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Problems solved by technology

[0003] Usually, if the air passing into the rotary kiln cannot be sufficiently diffused, the formed flow field is not fully covered, and the moving speed along the axis of the rotary kiln is too high, etc., the thermal loss rate will increase, that is, the full combustion of hazardous waste cannot be guaranteed. The method is to increase the air supply, but this will make the excess air coefficient of the rotary kiln too high, resulting in a large loss of heat. Ensure that the thermal loss rate is within the range of 5% to 8%, and the air excess coefficient of the rotary kiln has reached 1.5 to 2.0. Therefore, it is necessary to ensure both a low thermal loss rate and a low air excess coefficient at present. Hazardous waste incineration Key research topics of rotary kiln

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