Temperature-variable isothermal shift reactor

Abstract

The present invention relates to a temperature-variable isothermal shift reactor, comprising a furnace and a catalyst frame arranged within the furnace; a shifted gas collecting pipe, with an exit connecting to the outside, is arranged in the middle part of the catalyst frame; through holes, communicating with the inside and outside spaces of the catalyst frame, are formed in the walls of the catalyst frame; multiple heat exchange pipes are arranged in an cavity formed between the catalyst frame and a synthesis gas collecting pipe, wherein each heat exchange pipe comprises an outer pipe and aninner pipe; the first port of the outer pipe is closed, the inner pipe is inserted into the outer pipe through a second port of the outer pipe; the first port of the inner pipe is close to the firstport of the outer pipe and communicates with the inner cavity of the outer pipe; the second port of the inner pipe is connected with a feed gas pipe; the second port of the outer pipe communicates with an cavity formed between the catalyst frame and the furnace; the second ports of all inner pipes are connected with the feed gas pipe; and the second port of the outer pipe communicates with the cavity formed between the catalyst frame and the furnace.

Description

technical field [0001] The invention relates to chemical equipment, in particular to an isothermal shift reactor. Background technique [0002] CO shift reaction It is an exothermic reaction. The temperature of the fully reacted shift gas can reach about 450°C, but the energy barrier (reactivity energy) of the reaction is relatively high. Before the reaction, the reaction raw material, namely crude gas, needs to be heated to 260°C or higher. temperature. Therefore, the previous shift process uses the shift gas and crude gas heat exchanger, which uses the shift gas with higher temperature generated after the shift reaction to exchange heat with the raw gas before the shift reaction. A large amount of energy can be saved, and at the same time, the reaction rate and efficiency can be greatly improved. However, because the outlet temperature of the converter is very high, the pressure of the conversion reaction is very high, usually 3-6 MPa, which puts forward higher require...

AI Technical Summary

Problems solved by technology

[0005] However, as the reaction progresses, the activity of the catalyst decreases, leading to an increase in the catalyst's active temperature, from about 240°C in the initial stage to about 280°C, which requires the reaction temperature to increase accordingly.

The current solution to this problem is usually to increase the temperature of cooling water and heat exchange steam in the later stage of the reaction, resulting in strict requirements on the equipment, and subsequent supporting pipelines and equipment need to be changed accordingly

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