System for recycling waste heat of ethylbenzene production device for preparing steam

Abstract

The invention provides a system for recycling waste heat of an ethylbenzene production device for preparing steam. The steam comprises the ethylbenzene production device, a second-class lithium bromide absorption heat pump unit, a booster pump, a flash tank, a hot water circulating pump, a desalted water-condensed water mixer, a medium-temperature hot water-water replenishing heat exchanger, a circulating water-sewage water heat exchanger and a styrene production device. A medium-temperature hot water system in the ethylbenzene production device is communicated and connected with an inlet of the second-class lithium bromide absorption heat pump unit through a pipeline; a water inlet of the booster pump is communicated and connected with the second-class lithium bromide absorption heat pumpunit through a pipeline, and a water outlet of the booster pump is communicated and connected with a water return pipeline in the medium-temperature hot water system through a pipeline; and the invention provides a method for recovering waste heat of process hot water of the ethylbenzene production device for preparing low-pressure steam, the problem of low waste heat utilization rate of the production process flow of an existing refining enterprise is solved, the consumption of circulating cooling water is effectively reduced and the use effect is better.

Description

technical field [0001] The invention relates to an ethylbenzene production device, in particular to a steam production system using waste heat recovery of the ethylbenzene production device. Background technique [0002] Ethylbenzene is an intermediate product in the production of styrene, an important chemical raw material widely used as a monomer in the production of rubber, resins and plastics. At present, 90% of styrene on the market is produced by ethylbenzene dehydrogenation process. The main method of industrial production of styrene is to use iron-based catalysts to catalyze the dehydrogenation of ethylbenzene in a large amount of superheated steam environment. This process is limited by thermodynamic equilibrium, and the equilibrium conversion rate is low. At the same time, it consumes a lot of energy and costs high . [0003] At present, refining and chemical enterprises need to consume a large amount of 0.25MPaG and 0.35MPaG steam in the production process of st...

AI Technical Summary

Problems solved by technology

Unable to recycle the waste heat well, resulting in a low utilization rate of medium-temperature hot water, and consume a large amount of circulating cooling water, resulting in a great waste of energy

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