Full-low-transformation technique for tail gas of calcium carbide furnaces

Abstract

The invention relates to a full-low-transformation technique for tail gas of calcium carbide furnaces. The full-low-transformation technique adopts a deoiling furnace, a purifying furnace, a heat exchanger I, a deoxidizing furnace, a first humidifier, a pre-transformation furnace, a main transformation furnace, a steam manifold, a second humidifier, a second transformation furnace, a heat exchanger II, a third transformation furnace and a heat exchanger III which are sequentially connected and form a full-low-transformation system for tail gas purifying of the calcium carbide furnaces. Tail gas of the calcium carbide furnace can be treated by the full-low-transformation technique, the problems about too much reduction of catalyst at low steam and gas ratio, sulfur poisoning, low equipment performance in existing gas transformation technique of the calcium carbide furnaces are thoroughly solved, industrialization of high-concentration CO transformation is realized, the gas transformation technology utilizing insulating furnaces in conventional coal chemical industry is thoroughly changed, and sulfur-compensation transformation of low-sulfur gas is realized. The full-low-transformation technique has the advantages of high carbon monoxide transformation efficiency, low steam consumption, reliable devices and the like and can be widely applied to the technical field of gas separation.

Description

technical field [0001] The invention relates to the technical field of coal gas separation, and is especially suitable for the full-low conversion process of calcium carbide furnace gas. Background technique [0002] Calcium carbide is an industry with high energy consumption and high emissions. In calcium carbide production, calcium carbide furnace gas is the biggest source of pollution. Data show that there are currently nearly 400 calcium carbide production enterprises in the country, with a total annual output of more than 15 million tons. Every year, 3.5 billion m3 of calcium carbide furnace tail gas is produced, about 8 million tons of waste gas (carbon dioxide) and 600,000 tons of dust are emitted. In particular, the main component of calcium carbide furnace gas is carbon monoxide (75%~90%), all of which are white "sky lanterns". It is equivalent to wasting 2.4 million tons of standard coal every year and emitting about 12 million tons of CO 2 , causing great pollu...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the prior art, and to provide a method that fundamentally solves the excessive reducing agent sulfur poisoning of the catalyst under low steam-gas ratio in the prior art, high-concentration CO shift, and low-sulfur gas for sulfur supplement shift etc., under the same operating conditions and working conditions, its equipment capacity and energy-saving effect are good, and the device has high reliability, convenient operation and easy maintenance.

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