Process for converting high-concentration CO-tolerant sulfur

Abstract

The invention discloses a process for converting high-concentration CO-tolerant sulfur, which belongs to production of hydrogen-containing mixed gases. The process is characterized in that: a, at least one pre-converting reactor and at least one main converting reactor are adopted; b, a raw material process gas at least accounts for 15 to 40 percent of the total volume and is introduced into the pre-converting reactor in a to perform a pre-converting reaction first, then the pre-converted process gas is mixed with a raw material process gas which is not introduced into the pre-converting reactor, and the mixed gas is introduced into the main converting reactor to perform a converting reaction continuously; and c, the process condition of the pre-converting reactor is that: the water / gas volume ratio is 0.8 to 3.0, the dry gas space velocity is 1,000 to 10,000 m<3> / h, and the intake temperature is 220 to 320 DEG C. The process for converting the high-concentration C0-tolerant sulfur has low steam consumption, saves equipment investment, can effectively prevent overhigh temperature of a converting reactor bed layer, and makes the heat generated by the converting reaction in the converting reactors fully utilized.

Description

technical field [0001] The invention relates to a high-concentration CO sulfur-resistant conversion system and a process method. It belongs to the production of oxo synthesis gas and hydrogen-containing mixed gas, and particularly relates to a process for producing oxo synthesis gas and hydrogen-containing mixed gas by using sulfur-resistant shift catalysts and reacting water vapor with high-concentration carbon monoxide. Background technique [0002] The process gas produced by coal gasification mainly contains CO, CO 2 、H 2 、H 2 O, also contains a small amount of N 2 、CH 4 、H 2 S, COS, Ar, etc. The downstream products that use coal gas as raw material have an effect on the H in the raw gas 2 The requirements for the / CO ratio are different. When coal gas is used as raw material to prepare methanol, dimethyl ether, olefins, acetic acid and other products through oxo synthesis, generally only part of the CO in the gas needs to be converted into H 2 : The CO conten...

AI Technical Summary

Problems solved by technology

Another method is to add a pre-reactor before the main conversion reactor, introduce all the gasification process gas into the pre-reactor, reduce the dry basis composition of CO to about 40%-50% at high space velocity, and then enter the main conversion Reactor, the problem is that the pre-shift reaction product needs to cool down before entering the main reactor, otherwise the main reactor will still be overheated; since all the gas passes through the pre-shift reactor, the heat transfer area needs to be large enough

Another method is to use a very low water-gas ratio (such as 0.2 to 0.4) in the first shift reactor, and limit the reaction degree through water consumption, thereby controlling the bed temperature; but there are methanation reactions at low water-gas ratios However, the methanation reaction is a strong exothermic reaction. Once the methanation reaction occurs, the reactor bed will "overheat", causing catalyst sintering and even damage to the reactor; more importantly, most of the gasification process gas The water-air ratio itself is higher than 0.2-0.4, and the low water-air ratio process has multiple cooling and heating processes of materials, resulting in high energy consumption and large investment in equipment

[0006] From the above, in the prior art, for the high-concentration carbon monoxide raw material process gas entering the shift system, the increase in the load of the shift reactor caused by it and the overheating of the shift catalyst caused by it, the technical solutions that have been disclosed still have the following deficiencies: 1. The high water-gas ratio reduces the bed temperature, the steam consumption is large, and the energy consumption increases; 2. The pre-shift reaction product needs to be equipped with a heat exchanger with a large heat exchange area, which increases equipment investment; 3. The low water-gas ratio limit The reaction is exothermic, and there is a danger of methanation reaction, causing catalyst sintering failure, and even serious consequences of reactor damage

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