Low-temperature conversion structure for synthesizing ammonia by using hydrocarbon steam conversion method

Abstract

The invention discloses a low-temperature conversion structure for synthesizing ammonia by using a hydrocarbon steam conversion method. The low-temperature conversion structure comprises an additionallow-temperature conversion furnace, wherein the interior of the additional low-temperature conversion furnace is filled with a low-temperature conversion catalyst; the additional low-temperature conversion furnace is arranged in a circuit of an original low-temperature conversion unit through a pipeline; the installation position of the additional low-temperature conversion furnace is located atthe installation position of any desulfurization tank of an original desulfurization unit. According to the invention, an idle standby desulfurization tank is used as the additional low-temperature conversion furnace, and a desulfurization agent in the standby desulfurization tank can be replaced with the low-temperature conversion catalyst to increase the total amount of the low-temperature conversion catalyst while desulfurization effect is not influenced, so a part of conversion load is shared; and thus, the operation period of the low-temperature conversion unit catalyst is prolonged, theservice life of the catalyst is prolonged, and forced shutdown caused by replacement of the low-temperature conversion catalyst is reduced.

Description

technical field [0001] The invention relates to the technical field of ammonia synthesis equipment, in particular to a low-temperature shift structure for ammonia synthesis produced by hydrocarbon steam reforming. Background technique [0002] The carbon monoxide conversion section is set in the classic hydrocarbon steam reforming ammonia synthesis process. The carbon monoxide conversion section is further divided into a high-temperature conversion unit and a low-temperature conversion unit. Low-temperature conversion units generally use copper-based catalysts. Because the copper-based catalyst is easy to react with sulfur-containing and chlorine-containing compounds, the catalyst will be poisoned and lose its catalytic activity. Usually, the overhaul period of the synthetic ammonia system is 2 years. However, due to the uncertainty of the life of the low-shift catalyst itself due to the influence of the service conditions, it is often necessary to replace the catalyst due...

AI Technical Summary

Problems solved by technology

Copper-based catalysts are easy to react with sulfur-containing and chlorine-containing compounds, resulting in catalyst poisoning and loss of catalytic activity

Usually, the shutdown and overhaul time of the synthetic ammonia system is 2 years. However, due to the uncertainty of the service life of the low-shift catalyst itself due to the influence of the service conditions, the low-temperature shift unit often needs to replace the catalyst, resulting in the entire plant being forced to shut down in advance and losing production time.

[0003] New factories can increase the service time of the low-temperature conversion unit by connecting small low-voltage furnaces in series or installing larger low-voltage furnaces. However, for in-service factories, due to the compact arrangement of equipment, if new low-voltage Almost no construction space

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