Device and method for treating tail gas by utilizing carbide slag slurry in acetylene production through indirect circulation method

Abstract

The invention relates to a device and a method for treating tail gas by utilizing a carbide slag slurry in acetylene production through an indirect circulation method. According to the method, a carbide slag slurry is poured into a neutralization tank, and is conveyed into a clarification barrel by using a mortar pump; the carbide slag slurry is layered in the clarification barrel according to a sedimentation principle, wherein the solid part sinks to the bottom of the barrel, and the clear liquid rises to the top of the barrel and overflows into a clear water barrel; the slag slurry supernatant in the clear water barrel is conveyed to a leaching tower by using a leaching pump, and a leaching liquid is uniformly distributed in the leaching tower through spraying heads, and completely contacts, reacts with and absorbs acidic waste gas from a production device or waste gas capable of reacting with water to generate acidic substances; and the qualified tail gas after treatment is discharged to the atmosphere, and the neutralized leaching water enters a leaching tank, overflows into the neutralizing tank, and then is conveyed into the clarification barrel through the mortar pump so asto be recycled. The device of the invention is low in cost, convenient to control, remarkable in waste gas treatment effect and capable of continuously operating.

Description

technical field [0001] The invention relates to a tail gas treatment device that is acidic or generates acidic substances when it encounters water, in particular to a tail gas treatment device and method using the indirect circulation method of calcium carbide slag slurry in acetylene production. Background technique [0002] Traditional tail gas treatment methods that are acidic or produce acidic substances in contact with water include: [0003] (1) Sodium hydroxide lye absorption method. Using sodium hydroxide alkaline solution to treat the tail gas that is acidic or acidic when it encounters water is the method currently used by most manufacturers. The problem is that sodium hydroxide is extremely corrosive and has a strong impact on equipment and pipelines. Corrosiveness; if the lye is splashed on the skin, if the treatment is not timely or the method is not appropriate, it will cause severe burns to the skin, and in severe cases, life-threatening; and affected by the ...

AI Technical Summary

Problems solved by technology

Using sodium hydroxide alkaline solution to treat the tail gas that is acidic or acidic when it encounters water is the method currently used by most manufacturers. The problem is that sodium hydroxide is extremely corrosive and has a strong impact on equipment and pipelines. Corrosiveness; if the lye is splashed on the skin, if the treatment is not timely or the method is not appropriate, it will cause severe burns to the skin, which may be life-threatening; and affected by the market, the price of sodium hydroxide is relatively expensive

The existing problem is that clean water is used to absorb acidic waste gas at the beginning, but with the accumulation of operation time, clean water absorbs a certain amount of acidic waste gas and becomes acidic water, because water cannot absorb acidic gas indefinitely, waiting to be absorbed When it reaches a certain amount, it will become saturated acidic water, which can no longer absorb acidic waste gas, which will eventually lead to a reduction in waste gas treatment capacity

When water absorbs acid waste gas, it will release a certain amount of heat. The continuous accumulation of this heat will lead to a higher temperature of acidic water participating in the cycle, and the evaporation of high-temperature water will increase, and the evaporated water will take away a certain amount of absorbed acidic substances. As a result, the final exhaust gas contains a large amount of acid substances, which affects the treatment effect

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