An investment-saving heat-insulating sulfur-resistant shift device and process

Abstract

An investment-saving heat-insulating sulfur-resistant shift device is disclosed. The device includes an inlet-outlet heat exchanger, a detoxification tank, a sulfur-resistant shift reactor, a steam superheater and a shift gas waste boiler. The inlet-outlet heat exchanger includes a low-temperature segment and a high-temperature segment. The sulfur-resistant shift reactor includes a shell and an inner protective cylinder, with an annular space formed between the shell and the inner protective cylinder. The detoxification tank is connected to the annular space of the sulfur-resistant shift reactor. The annular gap of the sulfur-resistant shift reactor is connected to the inlet-outlet heat exchanger. According to the device, the inlet-outlet heat exchanger of raw material gas is divided intothe low-temperature segment and the high-temperature segment, outlet gas of the low-temperature segment after being detoxified is fed into the annular space to protect the shell, is then fed into thehigh-temperature segment of the inlet-outlet heat exchanger to be further preheated, and is then fed into the sulfur-resistant shift reactor and subjected to a sulfur-resistant shift reaction, thus greatly reducing the design temperature of the shell of the sulfur-resistant shift reactor, reducing the wall thickness of the reactor, and reducing the material selection grade of the reactor, so thatthe investment of the device is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to an adiabatic and sulfur-resistant conversion device and a conversion process applicable to coal-to-synthesis gases such as coal-to-synthetic ammonia, methanol, natural gas, ethylene glycol, and hydrogen production. Background technique [0002] In the adiabatic sulfur-tolerant shift device, the sulfur-tolerant shift reactor is the core equipment. The equipment is filled with a relatively expensive sulfur-tolerant shift catalyst. The raw material gas entering the equipment will mainly undergo the following reactions under the action of the catalyst : [0003] CO+H 2 O=CO 2 +H 2 [0004] The above reaction is a strong exothermic reaction. Although the operating temperature of the raw material gas at the reactor inlet is not high (usually 200-310°C), the bed temperature of the reactor is as high as about 420°C (in the early stage of the catalyst) to 450°C (...

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