Adjusting method and adjusting device of methanol synthesis system

Abstract

The invention relates to an adjusting method and an adjusting device of a methanol synthesis system. At the early stage of a catalyst, a part of a process gas at the inlet of a primary methanol synthesis reactor is directly led into the inlet of a secondary methanol synthesis reactor without a reaction, so that the secondary reaction load can be increased, one-reaction temperature exceeding is avoided, the service life of the catalyst of two reactors can be balanced, and the overall service life of the catalyst can be prolonged; at the tail stage of the catalyst, a part of a high-temperature gas at the outlet of the primary methanol synthesis reactor is directly led into the inlet of the secondary methanol synthesis reactor without a reaction, so that the initialization temperature of the catalyst and requirements of reactor heat exchange can be met; and a part of a fresh gas is directly led into a part between the outlet of the primary methanol synthesis reactor and the inlet of the secondary methanol synthesis reactor without passing through the primary methanol synthesis reactor, so that reactions can be delayed, the primary reaction load can be reduced, the secondary reaction load can be reduced, and reaction yields can be ensured.

Description

technical field [0001] The invention relates to the technical field of methanol synthesis, in particular to an adjustment method and an adjustment device for a methanol synthesis system. Background technique [0002] At present, the large-scale methanol synthesis technology mainly adopts two-stage methanol synthesis technology: water-cooled-air-cooled two-stage methanol synthesis technology and water-cooled-water-cooled two-stage methanol synthesis technology. Among them, the water-cooled-air-cooled two-stage methanol synthesis technology uses a water-cooled methanol synthesis tower for the first reaction, which produces high-grade steam by-products, and an air-cooled methanol synthesis tower for the second reaction. The reactor has both functions of a heat exchanger and a reactor; Water-cooling-water-cooling two-stage methanol synthesis technology uses a water-cooled methanol synthesis tower for the first reaction, which produces high-grade steam by-product, and a water-coo...

AI Technical Summary

Problems solved by technology

[0003] Both methanol synthesis technologies need to adjust the product load to a certain extent. In the existing technology, the circulating gas of the water-cooled-air-cooled methanol synthesis technology is directly fed into the cold reactor, and the bypass gas volume is large, which cannot be quickly adjusted. Function; water-cooled-air-cooled methanol synthesis technology and water-cooled-water-cooled methanol synthesis technology have no effective control means for the inlet temperature of the secondary reactor. When the load of the interstage heat exchanger increases, the inlet temperature of the secondary reactor may be too low to reach Catalyst activation temperature

[0004] In order to solve the above problems, the Chinese utility model patent "a low-pressure methanol synthesis system" (application number: CN201720469825.7) with the authorized announcement number CN206767965U and the Chinese patent application "low-pressure methanol synthesis method" with the application publication number CN107216236A (application number : CN201710296252.7) A bypass adjustment is set in the water-cooling technology, but the bypass is directly set at the entrance of the secondary reactor. For the water-cooling-air cooling process, fresh air directly enters the secondary reactor, which may cause the secondary reactor to react violently and be difficult to control , there is a risk of overheating; the Chinese patent application "A Process and Device for Methanol Synthesis" (Application No.: CN201710568542.2) with the application publication number CN107382665A is also provided with a bypass, but it directly introduces the fresh gas into the second reactor, and the same It may lead to violent reactions in the second reaction, and there is a risk of overheating. Although another bypass is provided in the patent application, it introduces the mixed process gas after air cooling and preheating into the first reaction to adjust the temperature of the first reaction. The load and temperature of the secondary reactor have no regulating effect

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