CO (Carbonic Oxide) sulfur-tolerant shift catalytic reaction process

Abstract

The invention relates to a CO (Carbonic Oxide) sulfur-tolerant shift catalytic reaction process belonging to a method for producing hydrogen through subjecting CO and steam to reaction by using a catalyst. A main shift reaction system and a pre-shift reaction system are adopted in the sulfur-tolerant shift catalytic reaction process, wherein the pre-shift reaction system is formed by arranging a pre-shift reactor A and a pre-shift reactor B in parallel and connecting the pre-shift reactor A and the pre-shift reactor B in parallel, wherein the structure of the pre-shift reactor A is identical to that of the pre-shift reactor B; the pre-shift reactor A and the pre-shift reactor B sequentially and alone operate on line; then, the pre-shift reactor A and the pre-shift reactor B simultaneously operate on line in a parallel connection way. The invention provides a relatively ideal CO sulfur-tolerant shift catalytic reaction process which can be used for prolonging the service life of a pre-shift catalyst, increasing the utilization ratio of the pre-shift catalyst, reducing the replacing frequency of the whole shift system catalyst, further reducing the operation cost of the catalyst, prolonging the operation period of the whole shift operation unit, improving the production capacity of a sulfur-tolerant shift device and reducing the production cost. The operation life of the pre-shift catalyst is prolonged by over 30%.

Description

technical field [0001] The invention relates to a CO sulfur-resistant shift catalytic reaction process. It belongs to the method of producing hydrogen by reacting carbon monoxide with water vapor using a catalyst. Background technique [0002] Water-gas shift is an important process in industrial production such as ammonia synthesis, methanol synthesis, and hydrogen production. During this process, the development and industrial operation methods of carbon monoxide sulfur-tolerant shift catalysts with high activity and high stability have attracted much attention. Among them, the cobalt-molybdenum-based sulfur-tolerant shift catalyst has the most outstanding industrial application performance in the water-gas shift process because of its wide temperature range, high shift activity, and no sulfur poisoning. [0003] In recent years, the large-scale development trend of domestic coal chemical industry has become increasingly significant, and the scale of coal-to-synthesis ga...

AI Technical Summary

Problems solved by technology

[0010] 1. The multiple pre-shift reactors set up in the shift system can only serve as backup for each other and reduce the load of the main shift system. When the catalytic activity of the filled catalyst is low, it will be deactivated and discarded, resulting in pre-shift The reaction catalyst has short service life, frequent replacement and low utilization efficiency;

[0011] 2. The operating cost of the pre-shift catalyst is high;

[0012] 3. The temperature fluctuation range of the pre-shift catalyst is large at the beginning of operation and at the end of operation, which has an adverse effect on the service life of the catalyst;

[0013] 4. If the pre-shift catalyst is not properly applied, the main shift catalyst will be directly exposed to impurities such as ash, water, and poisons in the raw gas, resulting in shortened service life, affecting the poor operation stability of the entire sulfur-resistant shift operation unit, and resulting in sulfur-resistant shift devices Reduced production capacity and increased production costs

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