Alkali liquor wet purification technology for aluminum melting furnace smoke

Abstract

The invention discloses an alkali liquor wet purification technology for aluminum melting furnace smoke. An aluminum melting furnace smoke pipe, a cooler, a spray tower, a fan and a chimney are connected through a pipeline; smoke conveyed by the aluminum melting furnace smoke pipe enters the spray tower through the cooler; the spray tower is communicated with the chimney through the negative pressure fan; a water tower and a water treatment system are arranged; the water treatment system consists of an acid pump, a dosing machine, a clear water reservoir, a neutralization tank and a drying bed; clear water pumps are arranged on the neutralization tank and between the clear water reservoir and the spray tower; a sewage pump is arranged between the neutralization tank and the drying bed; the clear water reservoir is communicated with the spray tower through the clear water pump; and the water tower is communicated with the cooler and the clear water reservoir. Compared with the conventional smoke purification technology, the alkali liquor wet technology purifies the smoke generated by the aluminum melting furnace, and can well absorb, neutralize and calcify hydrogen chloride Hel, sulfur dioxide SO2 and nitric oxides in the smoke.

Description

technical field [0001] The invention relates to a flue gas purification technology, in particular to an aluminum smelting furnace flue gas lye wet purification technology. Background technique [0002] At present, the design of the flue gas purification system of aluminum smelting furnaces at home and abroad mainly adopts the gas box type pulse bag filter purification process. However, the bag filter has high requirements for filter bags. bag material. Usually, when the flue gas temperature is lower than 120°C and the filter bag material is required to have acid resistance and durability, polyester flannelette and polyester needle-punched felt are often used; when dealing with high-temperature flue gas < 250°C, graphitized glass filaments are mainly used Cloth; in some special cases, choose carbon fiber filter bag material, etc. However, the outlet temperature of the flue gas produced by the aluminum smelting furnace reaches about 400°C, and the flue gas containing (SO ...

AI Technical Summary

Problems solved by technology

Because the dust contains aluminum compounds (AL 2 o 3 ) and other dust are easy to block the filter bag, which will affect the stability of the furnace pressure, the system will condense and cause the bag to burn, the temperature will be too high to cause the bag to burn and reduce the flow of flue gas

Flue gas contains a lot of CL 2 , HCL, HF and other harmful gases are harmful to the health of employees, and a large amount of acid gas is produced to corrode the plant and equipment, causing a large number of mechanical equipment to rust, and a large number of electrical components to fail and damage, causing safety hazards to the steel structure plant

Although the bag dust collector has fully met the environmental protection technology for dust gas, it cannot purify the acidic and corrosive gas to meet the environmental protection standard.

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