Flue gas desulphurization system suitable for downstream spraying semi-dry method

Abstract

The invention discloses a flue gas desulphurization system suitable for a downstream spraying semi-dry method. The system comprises a desulphurization tower, a distribution machine, a material lifting and conveying device and bag-type dust collectors. The desulphurization tower is vertical, the distribution machine is arranged at the top of the desulphurization tower, a flue gas inlet is formed in the tower wall below the distribution machine, and one or more stages of atomizing spraying guns are arranged on the inner side of the middle of the desulphurization tower, wherein the distances between the atomizing spraying guns of the same stage and the bottom of the tower are the same. First ash hoppers and a flue gas outlet are formed in the bottom of the desulphurization tower, the flue gas outlet is communicated with the bag-type dust collectors, and second ash hoppers are arranged on the bag-type dust collectors. Conveying devices used for conveying desulphurization ash are arranged between all the ash hoppers and the material lifting and conveying device. By the adoption of the desulphurization system, in treating flue gas, cooling of the flue gas and digestion of desulphurization agents are transferred into the desulphurization tower, so that the desulphurization technology process is shortened; the contact surface area of gas, liquid and solid phases is greatly increased, and the desulphurization efficiency is high; a little of equipment is arranged, operation is easy, and the change adaptability to the flow, SO2 concentration and temperature of the flue gas is high.

Description

technical field [0001] The invention relates to the technical field of industrial flue gas desulfurization treatment, in particular to a flue gas desulfurization system suitable for a downstream spraying semi-dry method. Background technique [0002] Flue gas desulfurization technologies are mainly divided into dry / semi-dry and wet flue gas desulfurization technologies. Dry / semi-dry flue gas desulfurization technologies mainly include spray spin drying absorption (SDA), circulating fluidized bed flue gas desulfurization (CFB), dense phase dry tower desulfurization technology, etc.; wet methods mainly include: lime / limestone-gypsum wet process, ammonia flue gas desulfurization process, magnesium oxide wet process, etc. [0003] At present, there are two kinds of semi-dry desulfurization methods commonly used, circulating fluidized bed semi-dry method and dense phase tower semi-dry method. The flue gas of the circulating fluidized bed semi-dry method enters from the bottom o...

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Problems solved by technology

[0006] In order to overcome the large investment, high energy consumption and difficult operation of the existing flue gas desulfurization system, the flue gas flow rate, SO 2 Concentration and temperature change adaptation range is small, gas-liquid-solid three-phase contact surface area is small, water adding device is easy to block and other defects, providing a new flue gas desulfurization system

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