Methanol waste gas treatment device and treatment method thereof

Abstract

The invention provides a methanol waste gas treatment device which comprises an absorption tower group, a gas inlet end of the absorption tower group is communicated with a first fan, and the first fan is used for sucking factory methanol waste gas into the absorption tower group. An exhaust end of the absorption tower group is communicated with an exhaust pipeline through a second fan; the absorption tower group is used for treating methanol waste gas in a plant area. An liquid inlet end of the absorption tower group is communicated with a desalted water pipeline, desalted water circulates inthe desalted water pipeline, a spraying device is arranged at the upper part of a packing layer of the absorption tower group, and the spraying device enables the desalted water to circulate in the absorption tower group through a first water pump and a first electromagnetic valve. A liquid outlet at the lower part of the absorption tower group is communicated with an alcohol-containing water storage tank at the front end of an alcohol washing tower, a gas inlet end of the alcohol washing tower is communicated with a methanol purge gas exhaust pipe, the alcohol washing tower is used for recovering methanol in methanol purge gas, and a liquid outlet of the alcohol washing tower is communicated to a methanol rectification process through a pipeline. The device has the advantages of wide application range, low cost, low energy consumption and high efficiency.

Description

technical field [0001] The invention relates to the technical field of methanol gas recovery and treatment, in particular to a methanol waste gas treatment device and a treatment method thereof. Background technique [0002] Methanol (Methanol, CH 3 OH) is the simplest saturated monohydric alcohol with a molecular weight of 32.04 and a boiling point of 64.7°C. It is not only an important chemical raw material, but also an energy source and vehicle fuel with excellent performance. Methanol has certain harm to the human body, and it is easy to volatilize at room temperature or when heated. Methanol gas and air can form explosive mixtures, which can easily cause combustion and explosion accidents when encountering open flames and high heat energy. Therefore, methanol storage tanks are generally buried underground to achieve storage of methanol. [0003] Due to the volatile nature of methanol, in order to ensure the safety of the factory area, for example, in the methanol stor...

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Problems solved by technology

[0003] Due to the volatile nature of methanol, in order to ensure the safety of the factory area, for example, in the methanol storage area, several breathing holes are often set as needed, so that the volatile methanol gas in the underground storage area can be discharged in time. Most enterprises Most of the breathing holes in the methanol storage area are directly emptied, which will cause environmental pollution and waste of methanol, which cannot meet the current environmental protection requirements; some enterprises also use water treatment devices to absorb the methanol discharged from the breathing holes through raw water (the principle is : Methanol is easily soluble in water), but the alcohol content in the water absorbing methanol is low, and its direct discharge will still pollute the environment. If it is treated by a wastewater treatment system, it will increase the burden on the wastewater treatment system and waste A large amount of raw water greatly increases the cost of methanol waste gas treatment in methanol storage areas

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