Method for vinyl chloride synthesis waste treatment and control

Abstract

The invention discloses a method for vinyl chloride synthesis waste treatment and control. High-temperature flue gas generated by waste incineration enters a quench tower and contacts with circulating acid fluid to be cooled; the cooled flue gas enters a condenser to be cooled again; the flue gas cooled once again enters a falling film absorber to be absorbed, and absorbed tail gas enters an alkaline tower to be treated. A waste treatment device can stably generate high-concentration and pure hydrochloric acid, the quality of the byproduct hydrochloric acid is ensured, the device can run by adopting different control methods according to different working conditions, the running cost can be reduced, and flue gas generated by incineration can also meet environmental protection requirements.

Description

technical field [0001] The invention belongs to the field of waste gas and liquid treatment, and in particular relates to a waste treatment control method for vinyl chloride synthesis. Background technique [0002] The main task of the incineration unit in the existing vinyl chloride (VCM) production and synthesis process is to incinerate the light and heavy component wastes produced by vinyl chloride (VCM), and also incinerate the exhaust gas from each process. These wastes are burned at a temperature above 1100°C to produce water vapor, carbon dioxide, hydrogen chloride, and of course a small amount of nitrogen oxides and chlorine gas. After the combustion products leave the incinerator, they pass through the waste heat boiler for heat exchange, and the temperature drops to 550°C. Then, water is used in the quenching tower. Absorb cooling. In the gas phase from the quench tower, there is still a small part of hydrogen chloride gas, which is absorbed in the falling film ab...

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Problems solved by technology

[0003] In this process, since the quenching tower cools the flue gas tail gas by adding water, it cannot be guaranteed that the amount of water matches the amount of hydrogen chloride in the flue gas, so that only low-concentration hydrochloric acid (18%) can be produced; at the same time, in In the quench tower, the exchange of flue gas and cooling liquid is generally not sufficient, and the temperature is still high when leaving the quench tower, which also affects the absorption of the subsequent falling film absorber.

In addition, the incinerator itself and the waste heat boiler are made of steel and the heavy components contain iron. The high-temperature exhaust gas may bring iron ions to the absorption system, and it is difficult to ensure The products of complete combustion and incomplete combustion will pollute hydrochloric acid and affect its quality

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