Tail gas circulating equipment of sleeve lime kiln

Abstract

The invention discloses tail gas circulating equipment of a sleeve lime kiln. The tail gas circulating equipment comprises a base, anair extracting pump, a powder filter and a cooling tower; the air extracting pump is fixedly mounted on the top end surface of the base; the powder filter is arranged over the air extracting pump, a top port of the powder filter is communicated with an exhaust port of the sleeve lime kiln through an air extracting pipe, and a bottom port of the powder filter is connected with a top port of the air extracting pump through a pipe; and the cooling tower is fixedly installed on the top end face of the base through an installation frame, and a bottom port of the cooling tower is connected with a left port of the sucking pump through a pipe. The tail gas treatment process adopted in the equipment comprises the steps of powder filtering, cooling and gas catalytic reduction, the tail gas can be greatly reduced, the treated tail gas is discharged into the sleeve lime kiln again to be recycled, and the discharge amount of the tail gas is reduced.

Description

technical field [0001] The invention relates to the technical field of a tail gas treatment device of a sleeve lime kiln, in particular to a tail gas circulation device of a sleeve lime kiln. Background technique [0002] The main component of calcium carbide furnace gas is CO. The furnace gas generally also contains tar, dust, a small amount of cyanide (HCN), etc. Using it as gas for secondary utilization not only saves production costs, but also reduces the harm of calcium carbide furnace CO emissions to the environment , but also calcined lime of good quality. The recovery and utilization of calcium carbide furnace gas is mainly used as a fuel for calcining lime, and the annular sleeve lime kiln has become the preferred kiln type for the production of high-quality active quicklime calcined with the tail gas of a closed calcium carbide furnace. [0003] However, compared with metallurgy and other industries, due to the high calorific value of calcium carbide furnace gas i...

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Problems solved by technology

[0003] However, compared with metallurgy and other industries, due to the high calorific value of calcium carbide furnace gas itself and nitrogen-containing compounds such as HCN, the use of calcium carbide furnace gas as fuel makes the NOx in the final flue gas emitted by the annular sleeve kiln generally higher (generally>300mg / Nm 3 @8% benchmark oxygen content), can no longer meet the increasingly stringent environmental emission requirements

[0004] Therefore, personnel in this field adopted a large amount of lime cooling air in order to reduce the ash discharge temperature and improve the service life of the belt conveyor at the bottom of the kiln, but excessive lime cooling air entered the kiln, resulting in an increase in the air coefficient in the kiln, resulting NOx out of control

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