Recovery device for gas-liquid separation of tail gas

Abstract

The invention relates to a recovery device for gas-liquid separation of tail gas. The recovery device comprises a barrel, a hollow partition plate, at least one recovery filter element and a pluralityof sealing baffles; the inner wall of the barrel is provided with an annular groove for fixing the hollow partition plate, and the hollow partition plate divides the barrel into an upper barrel bodyand a lower barrel body; the side wall of the upper barrel body is provided with an air inlet; the top surface of the hollow partition plate is provided with an air inlet hole; the position between the air inlet hole and the air inlet is provided with an air inlet channel which is formed for fixing the multiple sealing baffles; the top surface of the hollow partition plate is further provided withat least one through hole used for sealing and installing the recovery filter element; the hollow partition plate is provided with a liquid discharge port enabling an inner cavity of the upper barrelbody to be communicated with an inner cavity of the lower barrel body in a penetrating mode and a first liquid seal pipeline connected to the liquid discharge port; and the bottom surface of the hollow partition plate is provided with a liquid discharge hole for discharging liquid in an inner cavity of the hollow partition plate and a second liquid seal pipeline communicated with the liquid discharge hole. The recovery device for gas-liquid separation of the tail gas has the advantages of being high in gas-liquid separation rate and low in maintenance cost.

Description

technical field [0001] The invention relates to the field of tail gas recovery devices, in particular to a recovery device for gas-liquid separation tail gas. Background technique [0002] Propylene oxide is the second largest propylene derivative after polypropylene. As an organic chemical product, it is widely used in the production of polyurethane, unsaturated resin, surfactant, etc. Its products are closely related to the daily life of residents. Since the hydrogen peroxide method for producing propylene oxide is to replace the hydrogen peroxide method (HPPO process) with the chlorohydrin method of propylene oxide, which is still widely used in China, has serious environmental pollution and backward technology, the existing tail gas treatment device, that is, the wire mesh demister, has been changed from The gas phase and liquid phase are separated in the mixed gas-liquid flow, and a primary separation area and a secondary separation area are provided. The gas-liquid mix...

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Problems solved by technology

[0003] Since the mist eliminator can only collect mist with a particle size ≥ 3-5um, the collection efficiency can reach 98%-99.8% (HG / T21618-1998), and the tail gas treatment system requires separation accuracy of particle size > 0.3μm to remove droplets The rate is 99.98%, and the liquid flooding gas velocity of the wire mesh demister (that is, the limit gas velocity in the operation of the wire mesh demister) uf, the required operating gas velocity Ug = 0.5-0.8uf (m / s), while from the upstream The exhaust gas velocity ≥ 20m / s is easy to cause liquid flooding, causing the wire mesh demister to fail easily, failing to meet the requirements for aromatics collection, overloading the recovery device, and finally increasing the emission of VOCs

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