Chlorohydrin method propylene oxide plant tail gas treatment device

Abstract

The tail gas treatment device of the chlorohydrin method propylene oxide plant of the present invention comprises an alkali washing tower, a safety water-sealed tank, a blower fan, a caustic soda device safety water-sealed tank and a molten salt furnace connected in sequence; it also includes an interlock control system, the described The interlock control system includes a VOC online gas detector, a remote flowmeter, a caustic soda delivery cut-off valve connected in sequence between the fan and the caustic soda plant safety water-sealed tank, and a venting quick-opening valve connected above the soda washing tower and Venting regulating valve; the VOC online gas detector is used to detect the combustible gas content in the pipeline; the gas in the pipeline is measured by the remote flowmeter and then transported to the safety water-sealed tank of the caustic soda device and then enters the molten salt furnace as a combustion-supporting air for incineration . This process is to dilute the tail gas in a large amount to reach below 25% of the explosion limit concentration of each component of the tail gas, and then incinerate as the combustion-supporting air of the incinerator, which is not only safe in operation, but also can completely and effectively treat the waste gas. It can even recover heat or save fuel usage.

Description

technical field [0001] The invention provides a tail gas treatment device of a propylene oxide device by a chlorohydrin method, which is applied to a chemical device producing organic waste gases such as alkanes, alkenes and alkynes. Background technique [0002] Existing tail gas treatment technologies are as follows: [0003] 1. Adsorption method: mainly use adsorbents, such as activated carbon, to adsorb organic tail gas, and replace the adsorbents regularly. However, in this method, the adsorbent needs to be supplemented and regenerated; the exhaust gas with high temperature needs to be cooled first; the complex exhaust gas needs to be pretreated. [0004] The main disadvantage of this method is that it needs to be operated under certain pressure conditions. For the tail gas of the chlorohydrin method propylene oxide plant, the concentration of oxygen in the tail gas is about 45%. If the tail gas is compressed, there will be an explosion. danger. Secondly, if the deso...

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Problems solved by technology

[0011] In order to solve the defects in the prior art, such as potential safety hazards, need for secondary treatment, and incomplete purification, the present invention provides a tail gas treatment device for propylene oxide plant by chlorohydrin method, which solves the problem of organic waste gas such as alkanes, alkenes and alkynes in chemical plants. Pollution problems caused by emissions

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