Heat exchange device for methanol synthesis reactor

Abstract

The invention relates to a heat exchange device for a methanol synthesis reactor, which comprises a plurality of heat exchange tubes which are arranged along the length direction of the reactor, wherein the two ends of the heat exchange tubes are connected with a water inlet device and a water outlet device respectively. The heat exchange device for the methanol synthesis reactor is characterized in that: the heat exchange tubes are linear; the water inlet device has a box structure and comprises a first surface and an arched second surface which are formed by annular tube plates, the first surface is provided with a water outlet into which end parts of the heat exchange tubes are inserted, and the second surface is provided with a water inlet which is used for connecting an external circulating cooling system; and the structure of the water outlet device is identical with the water inlet device. Compared with the prior art, the heat exchange device provided by the invention is easy to process and high in heat exchange efficiency and suitable for the methanol synthesis reactor of megaton or above.

Description

technical field [0001] The invention relates to a heat exchange device for a methanol synthesis reactor. Background technique [0002] Methanol is widely used and is the basic organic chemical raw material and high-quality fuel. The core equipment of the methanol synthesis reactor is the heat exchange device installed in the reactor shell. Methanol synthesis is an exothermic reaction, and the heat released by the reaction must be removed in time to ensure that the temperature in the reactor is controlled within a certain range. The heat exchange device in the methanol synthesis reactor is one of the core technologies of the methanol synthesis reactor. Such as Figure 5 and Figure 6 As shown, the heat exchange device used in the existing vertical methanol synthesis reactor includes a plurality of heat exchange tubes parallel to each other. The upper and lower ends of these heat exchange tubes are bent and welded on the upper and lower annular headers. The lower annular h...

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Problems solved by technology

[0005] 1. The ends of the heat exchange tubes need to be bent and then connected to the annular main pipe. There are many procedures; and because the annular main pipe is a curved surface structure, the bending length and angle of each heat exchange tube are different, resulting in the exchange between the two annular main pipes. The heat pipes are of different lengths, resulting in inconsistent thermal expansion. In severe cases, the entire heat exchange device will be distorted and deformed, making it impossible to remove the heat exchange device from the reactor for maintenance.

[0006] 2. It is very difficult to process the tube holes of the heat exchange tubes on the circular main tube on the curved surface, and the accuracy is not easy to guarantee; it cannot be operated automatically, and it must be manually drilled one by one and welded one by one. The welding is difficult, labor-intensive, and the welding quality is not easy to guarantee

[0007] 3. Due to the large number of heat exchange tube bundles and large processing deviation, the level difference between the two annular main pipes is large, resulting in uneven heat exchange, resulting in abnormal production conditions and more impurities in methanol

[0008] 4. If a leak occurs at the connection between a certain heat exchange tube and the annular main pipe, it is difficult to repair

[0009] 5. Existing heat exchange devices are mostly used in methanol synthesis reactors with a scale of less than 200,000 tons / year; the above shortcomings determine that they are not suitable for use in large-scale methanol reactors, especially large-scale methanol synthesis with a million-ton level in the reactor

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