Water-cooled reactor for methanol synthesis

Abstract

The invention relates to a water-cooled reactor for methanol synthesis. The reactor comprises a furnace body, and a catalyst frame and a synthetic gas collection tube which are arranged in the furnacebody; a plurality of heat exchange tubes are arranged in a catalyst bed, the synthetic gas collection tube is provided with a plurality of gas inlet holes communicated with the catalyst bed and the inner cavity of the synthetic gas collection tube, and the outlet of the synthetic gas collection tube is connected with a synthetic gas outlet; every heat exchange tube comprises an outer tube and aninner tube; the lower port of every outer tube is closed, the inner tube is inserted into the outer tube from the upper port of the outer tube, the lower port of the inner tube is close to the lower port of the outer tube and is communicated with the inner cavity of the outer tube, the upper port of the inner tube is connected with a boiler water pipeline, and the sidewall of every inner tube is provided with a plurality of through holes at intervals; a gap exists between the sidewall of the outer tube and the sidewall of the inner tube; and the upper ports of the outer tubes are connected with a steam collection tube.

Description

technical field [0001] The invention relates to chemical equipment, in particular to a water-cooled reactor for methanol synthesis. Background technique [0002] Methanol synthesis is a reversible exothermic reaction process. For copper-based methanol synthesis catalysts, the reaction temperature needs to be maintained between 220°C and 280°C. If the temperature is too low, the catalyst will not be active, and if the temperature is too high, it will affect the life of the catalyst and product quality. In order to enable the methanol synthesis reaction to proceed in a suitable temperature range, heat exchange tubes are usually buried in the catalyst reaction bed, and the reaction heat released during methanol synthesis is removed through the vaporization of boiler water in the heat exchange tube to generate steam. This type of reaction The reactor is called an isothermal methanol synthesis reactor. [0003] Based on the consideration of prolonging the life of the methanol s...

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Problems solved by technology

[0005] (1) Considering the design pressure, since the pressure of the steam produced in the heat exchange tube fluctuates between 2.7MPAG and 5.2MPAG, the equipment and pipelines associated with it need to consider a higher design pressure, otherwise it cannot meet the requirements of 5.2 in the later stage of the catalyst. The steam pressure requirements of MPAG, and the increase of equipment and pipe wall thickness pushed up the project investment;

[0006] (2) Considering the rich steam production, although the catalyst can produce high-quality steam of 5.2MPAG in the later stage, the balance of the steam pipe network of the whole plant is determined by the 2.7MPAG steam in the early stage of the catalyst, and the high-quality steam of 5.2MPAG can only be adjusted in engineering design The decompression and downgrading of high-quality steam not only requires the addition of pipeline valves and automatic control instrument components related to decompression, but also has a certain impact on the steam pipe network of the whole plant

However, there is an increase in the pressure of the rich steam in the later stage of the catalyst, and the equipment and pipelines associated with it have to be designed according to the steam pressure and temperature in the later stage, which increases the project investment; at the same time, when the process system performs the balanced design of the steam pipe network of the whole plant, it can only The design is based on the low steam pressure and steam quality at the initial stage of the catalyst, but it will have a certain impact on the steam pipe network of the whole plant in the later stage of the catalyst

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