Silicomanganese furnace tail gas isothermal and sulfur-free transformation technology and system

Abstract

The invention relates to a tail gas isothermal and sulfur-free transformation technology and system. The technology comprises the following step of desulfurization treatment, and in specific cases, the tail gas being subjected to dust removing and compressing is directly desulfurized. The system comprises a pre-treatment device and a fine desulfurization device. The input end of the pre-treatmentdevice is used for being directly connected with a tail gas generation device so as to receive the tail gas generated by the tail gas generation device and conducting dust removing treatment of the tail gas. The input end of the fine desulfurization device is directly connected with the output end of the pre-treatment device and used for directly receiving and desulfurizing the tail gas treated bythe pre-treatment device. The silicomanganese furnace tail gas isothermal and sulfur-free transformation technology and system solve the problems including that a catalyst conducts over reduction ortemperature runaway under a low steam-gas ratio, the high concentration CO is prone to being partly sintered when the original impetus is transformed, the technological procedure is complex, the number of the equipment is large, the life of the catalyst is short, the system resistance is high, and the occupation area is large in the prior art, thoroughly change the transformation technique of a traditional coal chemical industry, and effectively improve the heat recycling efficiency of the device.

Description

technical field [0001] The invention relates to the technical field of gas separation and purification, and is particularly suitable for an isothermal sulfur-free conversion process and system for tail gas of a silico-manganese furnace. Background technique [0002] Silico-manganese production is an industry with high energy consumption and high emissions. At present, the production of silicomanganese mainly adopts closed submerged arc furnace, which melts ore raw materials by electric heating, and then uses carbonaceous reducing agent to reduce silicon, manganese and other elements in the ore, and finally produces silicomanganese alloy products, and at the same time, a large amount of rich Contains CO and H 2 exhaust. According to data, the current total domestic production of silicomanganese is about 12 million tons per year, and the by-product exhaust gas of about 750 Nm per ton of silicomanganese alloy products is produced 3 According to calculation, about 9 billion N...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problems existing in the prior art, and provide a method that fundamentally solves the excessive reduction or overheating of the catalyst in the prior art at low steam-to-gas ratio, high-concentration CO conversion, easy partial sintering of the initial driving force, low Sulfur gas first replenishes sulfur and converts to desulfurization. Under the same operating conditions and working conditions, the process flow is simple, the equipment is small, the system resistance, the catalyst operation period is long, the heat recovery rate is high, and the energy-saving effect is good. It is especially suitable for silicomanganese furnaces. Isothermal sulfur-free shift process of tail gas

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