Built-in cold wall type shift reactor for heat exchanger and direction connection structure for shift reactor and downstream heat exchanging equipment

Abstract

The invention discloses a built-in cold wall type shift reactor for a heat exchanger. In the invention, a heat exchanging component and an outlet center pipe are arranged in a pressure-bearing shell; low-temperature feed gas exchanges heat with reacted heat shift gas through the heat exchanging component, and then enters into a catalyst bed layer for an adiabatic transformation reaction, and the adiabaticly reacted heat shift gas is sent out through the outlet center pipe. The invention changes a gas-gas heat exchanger in a traditional process flow into an inner component of a reactor, reduces one pressure-bearing equipment shell according to the design by pressure difference, lowers the design temperature and the wall thickness of a reactor shell, improves the safety and the reliability of reactor operation, decreases external connection pipelines and occupation space, and eliminates many leakage sources and fail points. The invention also discloses a direct connection structure for the heat exchange between the shift reactor and the downstream equipment, wherein the shift reactor is arranged vertically, the downstream equipment is arranged horizontally, the shift reactor is directly connected with the downstream equipment through a connection pipe and flanges, and one connection pipeline and the occupation space are saved, thereby improving the safety of system devices.

Description

technical field [0001] The invention relates to the technical field of a shift reactor and the connection between the shift reactor and downstream heat exchange equipment, in particular to a cold-walled shift reactor with a built-in heat exchanger and a direct connection structure between the shift reactor and downstream heat exchange equipment. In the present invention, the gas-gas heat exchanger downstream of the old-type shift reactor in the traditional process is placed in the interior of the reactor as a whole, and becomes an internal part of the reactor to achieve structural and functional innovations. The present invention is suitable for carbon monoxide shift reactors. Also suitable for methanation reactors. Background technique [0002] see figure 1 , the existing axial shift reactor includes a pressure housing 10, the pressure housing 10 is installed on the foundation through a support 20 (not shown in the figure), and the catalyst bed 30 is arranged in the pressu...

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Problems solved by technology

[0005] Because the carbon monoxide shift reaction is carried out at relatively high pressure and temperature, the outlet temperature of the shift reactor R101 is between 400 and 500°C, and the main component of the process medium is H 2 , CO, CO 2 and water vapor, the medium hydrogen partial pressure is high, flammable and explosive; in addition, due to the high-temperature and special medium corrosion environment of the process medium, the material of the old shift reactor shell is generally made of medium-temperature hydrogen-resistant steel lined with stainless steel, and the gas-gas heat exchanger tube The process uses medium-temperature hydrogen-resistant steel lined with stainless steel, and the pipeline material is stainless steel; the cost of materials, manufacturing, inspection, and maintenance are very high

[0006] In addition, in the traditional process based on the connection of old-style shift reactors and old-style equipment, the old-style equipment is connected by pipelines. These pipelines and connected equipment not only occupy a large space for layout and piping, but also because of The pipe carries high pressure, high temperature, large diameter, and correspondingly thick pipe wall

At the same time, the layout of the pipeline and the elimination of the thrust of the pipeline require the use of a large number of elbow pipe fittings, which increases the number of girth welds. These reasons will result in high costs for pipeline materials, manufacturing, and inspection, and a large amount of investment. Corrosion in high-temperature special media environment, creating a large number of potential leak sources and failure points

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