Tail gas recovery treatment and cyclic utilization device for zinc plating continuous annealing furnace and treatment technology thereof

Abstract

The invention provides a tail gas recovery treatment and cyclic utilization device for an annealing furnace. The tail gas recovery treatment and cyclic utilization device comprises a tail gas recoverypipeline, a primary pressurizing system, a tail gas pretreatment system, a secondary pressurizing system, an oxygen removing device, a water pre-removing system, an adsorbing and drying system, a first pressure adjusting device and a PLC which are sequentially connected, wherein the PLC is in signal connection with the electric power. Tail gas is connected into an annealing furnace protecting gasinput main pipe after being connected with the first pressure adjusting device through the adsorbing and drying system. The treated tail gas is used by the zinc plating line annealing furnace in a cyclic manner. According to the treatment technology, after the tail gas generated by the furnace system passes through a cooler, most oil dirt is treated; then the tail gas enters the tail gas pretreatment system through the primary pressurizing system, so that oil dirt, dust, residual ammonia and carbureted hydrogen impurity in the tail gas are removed, and the tail gas enters the secondary pressurizing system, so that oxygen is removed; then the tail gas enters the water pre-removing system, so that water is separated out; the adsorbing and drying system carries out depth water removing and impurity gas removing, finally, the first pressure adjusting device adjusts pressure, the tail gas is fed into the zinc plating line continuous annealing furnace, cyclic utilization is achieved, and the device saves energy and is environmentally friendly.

Description

technical field [0001] The invention relates to the field of annealing furnace production equipment in the metallurgical industry, in particular to a galvanizing continuous annealing furnace tail gas recycling device and a galvanizing continuous annealing furnace tail gas recycling process. Background technique [0002] At present, the protective gas used in the continuous annealing furnace of the galvanizing line is mainly a mixture of nitrogen and hydrogen, and the tail gas is basically burned directly or evacuated to the atmosphere, which not only wastes energy, but is also very unsafe. The continuous annealing furnace of the galvanizing line is generally fed with a nitrogen-hydrogen mixture as a protective gas. The hydrogen content of the shielding gas ranges from 5% to 30%. The actual loss of this part of the shielding gas during operation is only about 1% of the hydrogen content. The rest of the shielding gas is burned directly or emptied into the atmosphere. In view ...

AI Technical Summary

Problems solved by technology

[0002] At present, the protective gas used in the continuous annealing furnace of the galvanizing line is mainly a mixture of nitrogen and hydrogen, and the tail gas is basically burned directly or emptied into the atmosphere, which not only wastes energy, but is also very unsafe

Images