Novel ammonia desulphurization absorption device

Abstract

The invention relates to a novel ammonia desulphurization absorption device which comprises a desulphurization tower, concentration circulating pumps, a liquid discharge pump, a washing circulating tank and a washing circulating pump, wherein the desulphurization tower is sequentially provided with a desulphurization tower slurry pool, a flue gas inlet, a concentration absorption area spraying layer, a liquid collection hopper, a washing absorption area spraying layer, a filler layer, a demister and a flue gas outlet from bottom to top; an aeration pipe is arranged at the bottom of the desulphurization tower slurry pool; a slurry outlet is arranged at the bottom of the desulphurization tower; and an inlet of the liquid discharge pump is connected with the slurry outlet. The concentration circulating pumps are arranged outside the desulphurization tower; the number of the concentration circulating pumps is consistent with the number of the concentration absorption area spraying layers; the outlet of each circulating pump is connected with one spraying layer; and the washing absorption circulating liquid collected by the liquid collection hopper flows to the washing circulating tank and is sprayed by the washing circulating pump to the washing absorption area spraying layer for circular washing. The device provided by the invention has the advantages of high desulphurization efficiency, low liquid-gas ratio and the like, and does not easily generate scaling blockage, the content of ammonium sulfate particles and liquid drops mixed in the flue gas at the outlet is low, and the byproduct quality is good,.

Description

technical field [0001] The invention relates to a novel ammonia desulfurization absorbing device for removing sulfur dioxide in flue gas such as coal-fired boiler flue gas, sintering machine flue gas, glass kiln flue gas and the like by using ammonia (ammonia water, liquid ammonia). Background technique [0002] At present, the absorption device for ammonia removal of sulfur dioxide in flue gas mainly adopts wet spray absorption tower, and there are two main forms of absorption tower: one is the empty tower spray tower represented by the American Masule Company, and the other The first is a three-stage multifunctional packed tower developed by East China University of Science and Technology. [0003] The structure of the empty tower spray tower is simple, the resistance is small, and it is not easy to cause fouling and blockage. However, the disadvantage of this device is that the absorption efficiency is low. If the desulfurization rate of the desulfurization system is to ...

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Problems solved by technology

However, the disadvantage of this device is that the absorption efficiency is low. If the desulfurization rate of the desulfurization system is to be guaranteed, the spraying amount of the absorption liquid must be increased, that is, a larger liquid-gas ratio is adopted, which will inevitably lead to an increase in energy consumption of the entire device; in addition, Empty tower spraying, the content of fine ammonium sulfate particles in the net flue gas at the outlet is high, which will cause secondary pollution and significantly increase the desulfurization operation cost

However, the three-stage multi-functional tower currently used in China has a complex structure, especially because its concentration section is decontacted with high-temperature flue gas, so that a large amount of dust in the flue gas directly enters the product, which not only affects the final by-product ammonium sulfate The quality of chemical fertilizers will lead to dust accumulation in the concentration section and fouling and blockage; later in China, the three-stage multifunctional tower was improved, such as the patent number: ZL 20112 0100190.6, a new two-stage multifunctional ammonia desulfurization device. The one-stage absorption tower is improved to two-stage, which greatly simplifies the structure of the absorption tower, but there are still disadvantages that the inner wall of the riser in the tower is easy to scale, reduces the flow area, and increases the resistance of the flue gas.

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