Temperature-variable isothermal shift reactor

Abstract

The invention relates to a temperature-variable isothermal shift reactor, comprising a furnace body, a catalyst frame, a syngas collecting pipe and a heat exchange pipe, wherein an inlet and an outletof the heat exchange pipe are respectively connected to water inlet pipelines and a steam pipeline; the variable temperature isothermal shift reactor is characterized in that the heat exchange pipe comprises a first heat exchange pipe group consisting of multiple first heat exchange pipes and a second heat exchange pipe group consisting of multiple second heat exchange pipes; wherein the cross section of each first heat exchange tube along the catalyst frame is evenly arranged in a cavity between the catalyst frame and the syngas collecting pipe; each second heat exchange pipe is evenly arranged along the outer circumference of the respective corresponding first heat exchange tube, and at least three second heat exchange tubes are evenly arranged around each first heat exchange pipe; twowater inlet pipelines are provided, and each water inlet pipeline is provided with a valve; inlets of all the first heat exchange pipes are communicated to the first water inlet pipe, inlets of all the second heat exchange pipes are communicated to the second water inlet pipe; outlets of the first heat exchange pipes and outlets of the second heat exchange pipes are both communicated to the steampipeline.

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, which will inevitably lead to a sharp increase in the pressure in the steam drum and heat exchange tubes; at the same time, the design wall thickness of the steam drum and heat exchange tubes should be increased accordingly

In addition to strict requirements on equipment, this will also lead to a series of other problems. For example, due to the increase in the wall thickness of the heat exchange tube, the heat transfer coefficient of the heat exchange tube will decrease, and the amount of heat exchange in the early stage of the reaction will also need to increase; and, Due to changes in the temperature and pressure of the outlet steam drum, it will inevitably lead to corresponding changes in supporting pipelines and equipment

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