Waste heat reclaiming process for CO transformation

Abstract

A waste heat recovery technics is used for CO conversion. The invention is characterized in that conversion gas recycles quantity of heat by a 1 conversion furnace, a medium-pressure waste pot, a 2 conversion furnace, a boiler water preheater, a 3 conversion furnace and a low-pressure waste pot, and then enters a low temperature formaldehyde washing reboiler and a desalting water preheater in turn after a 1 liquor condensate separator separates the liquor condensate to recycle reaction waste heat. The conversion gas enters the 2 liquor condensate separator and the conversion gas separated by the 2 liquor condensate separator is cooled 15 DEG C to not more than 40 DEG C by a conversion gas cooler, and then the conversion gas enters the 3 liquor condensate separator to be sent to the next working procedure. The generating low pressure steam is partly used for the steam of low pressure liquor condensate steam stripping. The invention has the advantages that a plurality of medium-pressure steam and low-pressure steam are saved and the waste heat of the CO conversion is recycled thoroughly.

Description

technical field [0001] The invention relates to a waste heat recovery process for CO transformation. Background technique [0002] The CO shift process is widely used in ammonia synthesis units and hydrogen production units. It is a major part of the purification process. Its process location is set after the gasification or conversion process. According to whether the selected catalyst is sulfur-resistant, it is divided into sulfur-resistant shift and non-resistant There are two processes of sulfur shift; according to the use temperature of the catalyst, it is divided into medium temperature shift and low temperature shift. Different transformation processes are mainly reflected in the changes in the number of transformation reaction stages, reaction temperature, and heat recovery methods, which mainly depend on the performance of the transformation catalyst, the raw materials for gas production used in industrial production, the gas production process, and subsequent purif...

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Problems solved by technology

[0006] Because the CO content in the crude synthesis gas produced by Shell pulverized coal gasification is very high, it is more than 10 percent higher than the CO content in the crude synthesis gas produced by the "coal-water slurry gasification" method with higher CO content, so high There is no precedent for the CO concentration and atmospheric volume of crude synthesis gas in the conversion process of all fertilizer plants in China and internationally, so the traditional waste heat recovery process cannot be applied here, and a new waste heat recovery process needs to be invented

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