Methanol-to-olefin quenching and washing water micro-bubble pressurized flotation purification device and method

Abstract

The invention relates to a methanol-to-olefin quenching and washing water micro-bubble pressurized flotation purification device and method, and the device comprises a quenching tower, a quenching water micro-bubble generator, a quenching water cyclone flotation device, a washing tower, a washing water micro-bubble generator, a washing water cyclone flotation device and a stripping tower. The quenching water cyclone flotation device is connected to the bottom of the quenching tower, the quenching water micro-bubble generator is connected with the quenching water cyclone flotation device, the washing water cyclone flotation device is connected with the bottom of the washing tower, the washing water micro-bubble generator is connected with the washing water cyclone flotation device, and the quenching tower is connected with the washing tower through a pipeline. The quenching tower, the quenching water cyclone flotation device, the washing tower and the washing water cyclone flotation device are respectively connected with the stripping tower through pipelines. After quenching water and washing water are treated by the method, impurities in the water are reduced, pollutants discharged into the stripping tower are less, and the pollution blockage of the stripping tower is reduced.

Description

technical field [0001] The invention relates to a methanol-to-olefin quenching and washing water treatment device and method, in particular to a methanol-to-olefin quenching and washing water micro-bubble pressurized flotation purification device and method. Background technique [0002] Methanol to olefins is a coal chemical technology that uses a fluidized bed reactor to produce low-carbon hydrocarbons such as polymer-grade ethylene and propylene under the action of a catalyst, using methanol as a raw material. The methanol-to-olefins plant is mainly composed of the following three parts: reaction regeneration system, quenching water washing and stripping system, and waste heat recovery system. Among them, the quenching water washing and stripping system mainly includes a quenching tower, a water washing tower and a stripping tower. The reaction gas from the reaction system is cooled down through the quenching tower and the water washing tower to separate the olefins and ...

AI Technical Summary

Problems solved by technology

This part of oily substances condenses together with water, which not only affects the water quality of the purified water, but also causes the heat exchange efficiency to drop due to its deposition in the system heat exchanger, air cooler, etc. Over time, it will also cause pipeline blockage, forcing the device to Parking for maintenance

At the same time, due to the damage of the methanol-to-olefins catalyst in water, the methylbenzenes produced by the catalyst are waxed below 50 ° C, and the mixture of these waxes and catalysts is more likely to stick to the tube wall of the heat exchanger , resulting in severe clogging of the heat exchanger for olefin separation, a serious decrease in thermal efficiency, and affecting the normal operation of the system

At the same time, due to the fact that the water system is prone to wax formation under low temperature conditions, this part of the water will block the tray after entering the water washing tower, resulting in high tower pressure, which will have a certain adverse effect on the production of the entire system

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