Novel dry-process cement kiln tail flue gas desulfurization system and desulfurization process thereof

Abstract

The invention discloses a novel dry-process cement kiln tail flue gas desulfurization system. A material taking device (1) is connected with an outlet of a decomposing furnace (6); the material taking device (1) is connected with a storage device (3); the storage device (3) is connected with a pulping device (2); and the pulping device (2) is respectively connected with a humidifier tower (7) and a raw mill (8) by virtue of a conveying device (4) and an injection device (5). The invention also discloses a desulfurization process for the system. With the adoption of the technical scheme, the desulfurization efficiency is high, and the desulfurization efficiency is more than 50 percent; the operation is convenient, and the degree of automation is high; the construction period is short, and normal production of the production line is not influenced by most of constructions of the desulfurization system; and moreover, an extra desulfurizing agent does not need to be purchased, and the investment cost and the operating cost are low.

Description

technical field [0001] The invention belongs to the technical field of cement production equipment, and relates to environmental protection technology in cement production. More specifically, the invention relates to a novel dry-process cement kiln tail flue gas desulfurization system. In addition, the invention also relates to the desulfurization process of the system. Background technique [0002] Currently, my country's SO 2 The emissions are more than 20 million t / year, of which the cement industry accounts for 3% to 4%. As we all know, SO 2 It is the main cause of acid rain, and it is also the main component of PM2.5. PM2.5 can form smog and cause respiratory diseases; acid rain seriously pollutes the environment, which can cause yellowing, falling off and even death of trees, reduced crop production, and corrosion of building materials. , the ecological balance of aquatic organisms, etc. The acid rain area has expanded from the southwest region in the 1970s to the v...

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Problems solved by technology

[0004] More than 1,500 new dry process cement production lines across the country are subject to geographical restrictions. Due to the difference in sulfur content in raw materials and fuels, SO 2 The emission concentration is also different. The sulfur content in raw materials and fuels of most production lines is low or does not contain sulfur, and SO in flue gas 2 The emission concentration is lower than 200mg / Nm 3 (10%O 2 ), which is not even detected on SO 2 However, some production lines have high sulfur content in raw materials and fuels, especially in limestone, which leads to SO 2 High emission concentration, some even as high as 1000mg / Nm 3 (10%O 2 )above

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