Heat recovery method of washing tower process water

Abstract

The invention discloses a heat recovery method of washing tower process water, which comprises the following steps: a liquid level of a heat-removed water buffer tank is established through desalted water F, the desalted water F is used as a source of heat-removed water, and heat-removed water G flows out of the bottom of the heat-removed water buffer tank to a heat-removed water circulating pump;and an inlet of the heat-removed water circulating pump receives heat-removed water G from the heat-removed water buffer tank, heat-removed water H is obtained after pressurization, and the heat-removed water H is sent to a shell pass inlet of a washing water cooler to serve as a cold source of the washing water cooler. On the premise of not increasing the consumption of circulating water and steam, the heat balance problem of the system is solved, the operating temperature of the washing tower is stabilized, scaling is avoided, the heat exchange efficiency of a heat exchanger is guaranteed,the overhaul frequency of the heat exchanger is reduced, and the yield of the device is increased.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for recovering heat from washing tower process water. Background technique [0002] The fluidized bed methanol to olefins process is mainly composed of a reaction regeneration device and a compression separation device. The main function of the reaction regeneration device is to contact the raw material methanol with the catalyst to generate process gas mainly composed of ethylene and propylene. The process gas is removed by gas-solid separation equipment. After a large amount of catalyst enters the quenching and washing system at the rear to further cool down and remove dust, the process gas with the temperature and dust content up to the standard is sent to the compression separation device for further processing. The reaction temperature is relatively high, generally about 380-400°C, and the process gas contains a large Water vapor, so the process gas will h...

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Problems solved by technology

[0002] The fluidized bed methanol to olefins process is mainly composed of a reaction regeneration device and a compression separation device. The main function of the reaction regeneration device is to contact the raw material methanol with the catalyst to generate process gas mainly composed of ethylene and propylene. The process gas is removed by gas-solid separation equipment. After a large amount of catalyst enters the quenching and washing system at the rear to further cool down and remove dust, the process gas with the temperature and dust content up to the standard is sent to the compression separation device for further processing. The reaction temperature is relatively high, generally about 380-400°C, and the process gas contains a large Water vapor, so the process gas will have a large amount of water vapor condensed during the washing and cooling process, which will greatly in

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