Method for reducing energy consumption of device for preparing olefins from oxy-compound

Abstract

The invention provides a method for reducing energy consumption of a device for preparing olefins from an oxy-compound. The method comprises the following steps that: a liquid oxy-compound raw material is firstly preheated to a certain temperature by a raw material preheater and then is divided into two parts, one part is heated and gasified by a raw material gasifier to become a gas phase raw material and the other part is atomized to become an atomized liquid phase raw material; the gas phase raw material and the atomized liquid phase raw material are mixed in front of a raw material/reaction gas heat exchanger and enter the raw material/reaction gas heat exchanger in the form of mist flow to carry out full heat exchange with oil gas generated through high-temperature reaction from a reactor so as to recover the high-temperature level heat of the oil gas generated through high-temperature reaction, the raw material after recovering the high-temperature level heat is totally gasified to become the high-temperature gasified raw gas and the high-temperature gasified raw gas then enters the reactor to undergo reaction; and the oil gas generated through high-temperature reaction from the reactor undergoes heat exchange in the raw material/reaction gas heat exchanger and then is sent to a rear chilled water washing system. The method has the advantages that the heat exchange effect of the heat exchanger can be effectively improved, the volume of the heat exchanger can be reduced and the energy consumption of the device can be reduced.

Description

technical field [0001] The invention relates to a method for reducing device energy consumption in the continuous reaction and regeneration process using oxygen-containing compounds as raw materials and low-carbon olefins as main products. Background technique [0002] Light olefins such as ethylene, propylene, and butadiene, and light aromatics such as benzene, toluene, and xylene are basic raw materials for petrochemicals. At present, the production of ethylene mainly relies on the tube furnace steam cracking process using light naphtha as raw material. Due to the shortage of crude oil resources and the increasing price, naphtha resources have become more and more insufficient, and the production cost of low-carbon olefins is getting higher and higher. At home and abroad, ethylene production routes with richer raw material sources are being actively developed. With methanol, ethanol, dimethyl ether, C 4 ~C 10 Alcohol compounds or their mixtures are used as raw materials...

AI Technical Summary

Problems solved by technology

[0006] What the present invention aims to solve is the technical problem of poor heat exchange effect between methanol gas raw material and high-temperature reaction oil gas and gas, and relatively large volume of heat exchanger in the existing MTO process technology

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