Gradient adjustment method of limestone content in wet desulphurization circulating liquid

A limestone and circulating fluid technology, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve problems such as increased manufacturing costs and operating costs, complex structures, etc., and achieve reduced equipment costs and operating costs, simple operation, Easy to run effects

Active Publication Date: 2017-02-01
SHANDONG UNIV
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Problems solved by technology

[0008] However, the improved single-tower double-cycle desulfurization technology is to modify the interior of the desulfurization tower, making its structure complex and increasing manufacturing and operating costs

Method used

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  • Gradient adjustment method of limestone content in wet desulphurization circulating liquid

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Embodiment Construction

[0019] Such as figure 1 As shown, the gradient adjustment method of limestone content in the wet desulfurization circulating fluid of the present invention adopts the existing conventional desulfurization tower, the bottom of the desulfurization tower is provided with an aeration tank, and the top of the desulfurization tower is provided with multi-layer (2-5 layers) The slurry nozzle forms a multi-layer spray layer. The internal components of the desulfurization tower do not need to be changed or modified. In addition, an independent limestone slurry tank is set up.

[0020] The bottom layer of the desulfurization tower is directly connected to the slurry aeration tank through the desulfurization circulating pump, and directly transfers the desulfurization circulating liquid in the aeration tank (the original desulfurization limestone slurry in the aeration tank and the flue gas desulfurization that falls from the spray layer) The final slurry) forms a circulation in the de...

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Abstract

The invention relates to a gradient adjustment method of limestone content in a wet desulphurization circulating liquid. The method comprises the following steps: detecting the flow rate of waste flue gas entering a desulfurizing tower and the sulfur dioxide content in the waste flue gas, and detecting the sulfur dioxide concentration in flue gas at the outlet of the desulfurizing tower; determining the opening number of spray layers according to the total amount and concentration of sulfur dioxide in the waste flue gas, and optimizing the limestone content in the mixed slurries entering the spray layers. The total new added calcium / sulfur ratio in the mixed slurry of all the opened spray layer is 1:(1.03-1.05); in the mixed slurries of all the spray layers from top to bottom, the limestone content sequentially lowers, thereby forming the limestone content gradient distribution along the spray layers in different heights; and when the desulfurization load of the desulfurizing tower changes along with the changes of the sulfur dioxide concentration and total amount in the waste flue gas, the limestone slurry amount is adjusted according to the total calcium / sulfur ratio to adapt to the corresponding sulfur dioxide increased load. The method implements high desulfurization efficiency under the single-tower single-circulation conditions. The desulfurization process is simple to operate and convenient to run, and lowers the cost.

Description

technical field [0001] The invention relates to a method for adjusting the limestone content in wet desulfurization circulating liquid, belonging to the technical field of wet desulfurization. Background technique [0002] Limestone wet desulfurization is currently the most effective desulfurization method for flue gas desulfurization in coal-fired power plants. With the further stringent requirements for ultra-low emission of flue gas, the limestone wet desulfurization process has gradually revealed some disadvantages. For example, the change of boiler load and the change of coal sulfur content will affect the change of sulfur dioxide concentration and emission in flue gas, which will increase the difficulty of ultra-low emission control of sulfur dioxide. The use of technologies such as wet electrostatic demisting of flue gas after desulfurization can effectively control indicators such as mist particles and smoke dust in the exhaust flue gas, but the overall effect on ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/80
CPCB01D53/502B01D2251/404
Inventor 苏继新王路瑶王国庆张晓霞程一倩孙德山
Owner SHANDONG UNIV
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