U shape tubular isothermal low-temperature methanol synthesis tower

Abstract

The invention relates to a new U-shaped isothermal low-pressure methanol converter, comprising a outer cylinder, and inner elements, wherein, said outer cylinder comprises a upper closure head, a cylinder body, a positioning ring, and a lower closure head; and said inner elements comprises a separation plate, a cold gallbladder, and a support ring, while said upper closure head has a charging pipe; said lower closure head has a discharging pipe; the air guiding pipe of cold gallbladder is sealed on the separation plate with stuffing and catalyst is arranged outside said cold gallbladder; the cold gallbladder pipe is in multiple rings U-shaped and via support ring supported on the positioning ring welded on the inner wall of outer cylinder to hang and support cold gallbladder; said outer cylinder also comprises a new air distributor inside the upper closure head to connect the charging pipe. The invention provides a new U-shaped isothermal low-pressure methanol converter with uniformly distributed charged air, high synthesizing efficiency, simple structure and lower producing cost, which can apply large methanol synthesizing device.

Description

(1) Technical field [0001] The invention belongs to a cold tube type gas-solid phase reactor, which is especially suitable for low-pressure methanol synthesis, and can also be used for the synthesis reaction of ammonia and dimethyl ether. (2) Background technology [0002] Low-pressure methanol synthesis, due to low synthesis pressure and low overall energy consumption, low-pressure synthesis is generally used for large-scale production of methanol at home and abroad, and the synthesis pressure is 5-10 MPa. Copper-based catalyst is used, the reaction temperature is 200-280°C, and the space velocity is 6000-10000h -1 . [0003] The methanol synthesis reaction has a large heat release, while the methanol catalyst has poor heat resistance and a narrow range of active temperatures. The conversion rate of synthetic methanol under low pressure is higher than that under low pressure. Catalyst loading capacity is large. Therefore, the low-pressure methanol synthesis tower not on...

AI Technical Summary

Problems solved by technology

Therefore, for the fixing of the two ends of the descending cold pipe in the U-shaped cold pipe, there is a certain thermal stress, which is likely to cause cracking at the weld between the cold pipe and the ring pipe, seriously affecting production.

[0007] In addition, with the expansion of production capacity, the diameter of the synthesis tower has increased to 2-4m, and the absence of a gas distributor at the inlet of the tower will also affect the uniform distribution of the gas flow, thereby affecting the reaction.

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