Novel CO isothermal conversion method

Abstract

The present invention discloses a novel CO isothermal conversion method, which comprises the following steps that: raw material gas is subjected to heating temperature increasing, dust filtration and poison removing; the filtered raw material gas enters a first conversion furnace to carry out a conversion reaction; the by-produced medium pressure steam is adopted to remove reaction heat produced in the first conversion furnace; the gas leaves the first conversion furnace, enters a raw material gas pre-heater to preheat the inlet raw material gas, then enters a waste heat boiler to by-produce steam so as to cool, and enters a second conversion furnace to carry out a conversion reaction; the second conversion furnace inlet gas is preheated to remove reaction heat produced in the second conversion furnace; and the gas leaves the second conversion furnace, and then enters the downstream process. The novel CO isothermal conversion method is applicable for characteristics of a wide steam-gas ratio and a wide CO dry base content. With the novel CO isothermal conversion method, a reactor hot spot temperature can be controlled so as to improve a catalyst service life and improve equipment operation conditions; methanation side reaction generation can be effectively inhibited; reaction heat can be efficiently recovered; conversion rate of the single reactor can be increased; the conversion process can be simplified; and equipment cost can be reduced.

Description

Technical field: [0001] The invention relates to a novel conversion method for performing a conversion reaction at a constant temperature, in particular to a novel CO isothermal conversion method. Background technique: [0002] transformation response ( ) is an exothermic reaction. In traditional industrial production, adiabatic reactors are used in converter furnaces. In the process setting, multi-stage reactions are often used, and the way of heat exchange and cooling between stages is used. The traditional conversion method has the characteristics of relatively complicated process, high heat loss and high equipment cost. At the same time, when the dry basis content of CO in the feed gas is high, the hot spot temperature of the shift reactor is high, and the outlet of the shift reactor is prone to overheating, which affects the service life of the shift catalyst. adjustment means to avoid overheating. At present, there are two conversion processes for feed gas with hig...

AI Technical Summary

Problems solved by technology

The high steam-gas ratio conversion process has a high water vapor content, a large reaction driving force, a high hot spot temperature of the catalyst bed, and the reactor is prone to overheating, which affects the service life of the catalyst and the safe operation of the equipment. At the same time, due to the large amount of steam , higher operating costs

The low steam-to-gas ratio conversion process reduces the H in the feed gas 2 The content of O is prone to methanation reaction; the load of a single reactor is low, and the utilization rate of the equipment is poor; 2 O, unable to convert H in the feed gas 2 The content of O is reduced, and the reactor is easy to overheat

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