A recovery system and control method for tail gas from electric furnace zinc smelting

Abstract

The invention discloses an electric furnace zinc-smelting tail gas recovery system and a control method thereof and aims at providing the electric furnace zinc-smelting tail gas recovery system and the control method thereof with the high safety. The electric furnace zinc-smelting tail gas recovery system comprises a safe partition device arranged on a setting pipe, a first buffer, an efficient washer, a second buffer, a water ring type compressor, a separator, a third buffer, a fire arrester and a drying kiln, wherein the first buffer, the efficient washer, the second buffer, the water ring type compressor, the separator, the third buffer, the fire arrester and the drying kiln are connected in sequence through pipelines; an inlet of the first buffer is communicated with the tail gas exhaust position of the top of an electric furnace through the pipeline provided with a second valve; a fifth valve is arranged on the pipeline between the water ring type compressor and the separator; an outlet of the efficient washer is communicated with an inlet of the fifth valve through the pipeline provided with a fourth valve; a ninth valve is arranged on the pipeline between the fire arrester and the drying kiln, and the pipeline between the fire arrester and the ninth valve is communicated with a setting branch pipe with an eighth valve; an inlet and an outlet of the water ring type compressor are communicated through the pipeline provided with a sixth valve.

Description

technical field [0001] The invention relates to the technical field of recovery and utilization of tail gas from an electric furnace for zinc smelting, in particular to a recovery system and a control method for tail gas of an electric furnace for zinc smelting. Background technique [0002] During the Eleventh Five-Year Plan period, my country's nonferrous metal industry has made remarkable achievements. In 2010, the national output of ten commonly used nonferrous metals reached 31.35 million tons, ranking first in the world for 9 consecutive years. [0003] The non-ferrous metal industry is a mineral processing industry, with large logistics volume and long process flow, and is one of the main industries that pollute the environment. Especially because metal minerals in my country are low in grade, complex in structure, and often coexist with toxic metal and non-metallic elements, so a large amount of harmful waste residue (rock), waste water and waste gas are produced in ...

AI Technical Summary

Problems solved by technology

[0006] One is that these gases are flammable and explosive gases, which are prone to leakage during the recovery process and cause gas poisoning of field operators. For example, if they are mixed with humid air, they are prone to explosion, which is a high-risk gas recovery and utilization, with great safety hazards

[0007] Second, the exhaust gas contains a large amount of blue carbon dust, which is easy to block pipes, valves, and wear equipment;

[0008] The third is that the electric furnace is operated intermittently, and the height of the material layer is often checked. During the inspection, the furnace must be stopped. At this time, the furnace is under negative pressure, and the furnace is frequently started and stopped. The conventional recovery method cannot solve the safety production problem. The wet air is mixed into the exhaust system, which will cause explosion accident

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