Treatment method for exhaust gas of chlorohydrination epoxypropane device

Abstract

The invention discloses a treatment method for exhaust gas of a chlorohydrination epoxypropane device. The treatment method comprises the following steps: washing a chlorohydrination organic waste gasof the epoxypropane device through an alkali washing tower to remove an acid gas; then introducing a safety water seal tank provided with an air inlet, and mixing the chlorohydrination organic wastegas with supplementary air to enter a fan; detecting the content of a combustible gas of the gas in an outlet line of the fan through a VOC online gas detector, and conveying to a caustic soda flake device safety water seal tank after measuring through a remote transmitting flow meter; and then entering a molten salt furnace to be used as combustion-supporting air to perform combustion. The treatment method further comprises an interlocking control method for determining the safety while working. The process refers to dilute a large amount of the exhaust gas to reach less than 25% of the explosive limit concentration of each component of the exhaust gas, and then take the exhaust gas as the combustion-supporting air of an incinerator to be incinerated, thereby not only being safe in operation, but also being capable of completely treating the waste gas effectively, and even being capable of recycling heat or saving fuel in specific combustion equipment.

Description

technical field [0001] The invention provides a method for treating tail gas of a propylene oxide plant by a chlorohydrin method, which is applied to a chemical plant producing organic waste gases such as alkanes, olefins, 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 de...

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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 method for treating the tail gas of a propylene oxide plant by chlorohydrin method, which solves the problems of organic waste gases such as alkanes, alkenes, and alkynes in chemical plants. Pollution problems caused by emissions

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