Methanol synthesis system and steam expansion method for the methanol synthesis system

Abstract

The invention provides a methanol synthesis system and a steam dilatation method of the methanol synthesis system. The methanol synthesis system comprises a feed gas pretreatment device connected with a feed gas delivery pipe, a methanol synthesis reactor connected with the feed gas pretreatment device, and a boiler feed water pipe connected with the methanol synthesis reactor to enable boiler feed water to perform heat exchange in the methanol synthesis reactor so as to output byproduct steam, wherein a boiler feed water preheater is arranged on the boiler feed water pipe, and a heat supply inlet of the boiler feed water preheater is connected with a gaseous product output port of the methanol synthesis reactor so as to preheat the boil feed water in the boiler feed water preheater with a gaseous product in the methanol synthesis reactor and then output the gaseous product. By means of the technical scheme, the problem that heat output from the methanol synthesis reactor in the prior art cannot be effectively carried away or utilized and accordingly the temperature of waste heat of an output product is high can be solved.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a methanol synthesis system and a steam expansion method for the methanol synthesis system. Background technique [0002] In the existing methanol synthesis system, the methanol synthesis reactor is a radial flow reactor, the gas enters through the central distribution pipe, and then passes radially through the catalyst bed packed on the shell side, so that the methanol synthesis reaction occurs. This methanol synthesis reaction is an exothermic reaction. A large number of heat exchange tubes are distributed in the methanol synthesis reactor, which are connected to the boiler feed water. The boiler feed water is provided from the outside. The boiler feed water absorbs the reaction heat generated by the methanol synthesis reaction to form by-product steam, thereby controlling the temperature range in the methanol synthesis reactor. Part of the by-product steam is used t...

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a methanol synthesis system and a steam capacity expansion method for the methanol synthesis system, so as to solve the problem that the heat released by the synthesis reaction in the methanol synthesis reactor in the prior art cannot be effectively taken away or utilized, resulting in the output of the product The problem of high waste heat temperature

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