A process and device for rapidly preparing powdered activated coke for desulfurization by using pulverized coal

Abstract

The invention relates to a process and a device for quickly preparing powdered active coke for desulfurization by utilizing pulverized coal. The process and the device are used for producing a powdered active coke product with certain desulfurization performance and reducing combustible gas. According to the process, the powdered active coke for desulfurization and a byproduct reducing gas are prepared from the pulverized coal of 20 to 500 microns by remaining in an entrained-flow bed fast reaction furnace for 1 to 60 seconds. The process and the device has three characteristics that 1, the desulfurization active coke can be prepared by directly utilizing the pulverized coal for combustion of a boiler, so in-situ preparation of a desulfurizing agent of a coal-fired power plant can be realized, and the production cost and the transportation cost of the active coke are reduced; 2, the reducing combustible gas generated in the production process of the active coke can serve as a reburning fuel and is fed into the boiler, so the production quantity of nitric oxide during combustion of the pulverized coal is reduced and the energy efficiency of the whole process is improved; and 3, sulfur dioxide can be recovered and high-concentration sulfur dioxide can be reduced into elemental sulfur, so resource utilization of the sulfur dioxide can be realized.

Description

technical field [0001] The invention relates to a process and device for preparing powdered active coke by using coal powder. The powdered active coke is a high-efficiency adsorbent and is suitable for dry desulfurization process. Background technique [0002] At present, the main desulfurization process used at home and abroad is the wet or semi-dry flue gas desulfurization process of calcium-based desulfurizers. It is characterized by mature and reliable technology, high desulfurization efficiency and easy access to raw materials. However, there are still defects such as large water consumption, secondary pollution, and high investment. my country is one of the countries in the world that is seriously short of water resources, especially many coal-fired power plants are located in the western region where water resources are seriously short and coal resources are abundant. Therefore, the promotion and application of wet desulfurization technology that consumes a lot of wa...

AI Technical Summary

Problems solved by technology

At present, the active coke used in industry is columnar active coke with a diameter of 5 mm to 8 mm, but there are problems such as complex manufacturing process, high price, low mechanical strength and large loss, which seriously limit the application of active coke desulfurization technology in my country. The price of active coke produced by Germany’s BF Company and Japan’s Mitsui Mine is about 900-1,000 US dollars per ton, and the price of domestically produced active coke products is about 3,000-6,000 yuan per ton

[0004] Domestic research on active coke mainly starts with active coke raw materials and granulation technology to reduce prices and improve mechanical strength, such as Chinese patent applications with application numbers 01141393.X and 2009100830478. Although these processes have improved the performance of active coke to a certain extent , reduce the production cost of active coke, but the main cost of active coke lies in the molding and granulation of active coke, so the existing technology has not fundamentally solved the problems of high production cost and complicated preparation process of active coke

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