A kind of kiln tail gas purification device and purification method

Abstract

The invention relates to a kiln exhaust gas purifying device and a kiln exhaust gas purifying method. The purifying device comprises a cleaning groove, a tar condenser, a cooling tower, a pressure buffer tank, a frequency conversion fan, a spraying absorption tower, an original absorption liquid pool, an ammonium sulfate transfer pool, a cooler, a crystallization tank, a centrifugal machine, a blender mixer and a drier. The purifying method comprises the following steps: S1, condensing and recovering tar; S2, supplying fresh air; S3, spraying and absorbing ammonia; and S4, carrying out post-treatment of an ammonium sulfate liquid. According to the technical scheme, the exhaust gas purifying device and the exhaust gas purifying method can be used for purifying exhaust gas containing ammonia and tar in the process of sintering lithium iron phosphate in an industrial kiln, so that the sintering atmosphere in the kiln is in a normal state.

Description

technical field [0001] The invention relates to the technical field of industrial electric kiln tail gas purification, in particular to a kiln tail gas purification device and a purification method. Background technique [0002] During the sintering of lithium iron phosphate in industrial electric kilns, tail gas containing ammonia and a small amount of tar will be produced. Ammonia is a foul odor, if it is directly discharged into the atmosphere, it will seriously affect the human respiratory system, circulatory system, and digestive system. In addition, while purifying and absorbing the tail gas, attention should be paid to recovering the tar, otherwise the tar will affect the absorption effect of ammonia. The sintering process in the kiln has a strict upper limit on the oxygen content, and the change in pressure near the exhaust port is very likely to affect the sintering atmosphere in the furnace. Therefore, it has become a difficult problem to deal with the tail gas ge...

AI Technical Summary

Problems solved by technology

[0003] At present, the exhaust gas treatment method of lithium iron phosphate kiln is not mature enough, and most manufacturers adopt non-contact ventilation method. There are two problems in this method: 1. Although the slight positive pressure in the furnace is guaranteed, the air at the exhaust port There is a high oxygen concentration difference with the atmosphere in the furnace body, and the oxygen in the air is likely to penetrate into the furnace and affect the oxygen content in the furnace; 2. The temperature of the exhaust gas discharged from the exhaust port is about 200 ° C, absorbing a large amount of air Afterwards, the temperature of the gas will be significantly lowered, and a large amount of tar will be accumulated in the non-contact suction hood and air duct. It is necessary to remove the tar regularly, but the removal of tar is not easy

Images