Fume wet-type magnesia desulfated waste-liquid recovery method

A technology of desulfurization waste liquid and recovery method, which is applied in the field of flue gas desulfurization, can solve the problems of long process, secondary pollution, high investment, etc., and achieve the effects of reducing energy consumption, saving energy, and reducing recycling costs

Active Publication Date: 2009-10-07
HEFEI GUOHUI ENVIRONMENTAL PROTECTION TECH
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Problems solved by technology

Most of these methods have a long process, high investment, and unsatisfactory absorption rate. At the same time, due to the reaction of sulfur dioxide and lime, a layer of coating will be formed on the surface, and the utilization rate of the ab

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Embodiment Construction

[0033] The present invention is achieved in this way: a method for recovering waste liquid from flue gas wet type magnesium oxide desulfurization, the method is to adopt flash evaporation concentration treatment magnesium sulfate solution, the method comprises the following steps:

[0034] One-effect concentration step of magnesium sulfate solution,

[0035] This step adopts positive pressure operation, the pressure is: 0.4-0.8Mpa, and its heater uses fresh steam as the heat source; heating to a temperature of: 120-135°C, and concentrating the magnesium sulfate solution to 20%-25%;

[0036] The second effect concentration step of magnesium sulfate solution,

[0037] Use the secondary steam generated by the first-effect evaporation to heat the solution to provide heat for this step. The temperature is 105-115°C and the pressure is 0.2-0.4Mpa, so as to continuously evaporate and remove excess water in the magnesium sulfate solution to the magnesium sulfate solution. Achieving a...

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Abstract

The invention relates to the field of the fume wet-type magnesia desulfated waste-liquid recovery of boilers and sinter machines, and the like, in particular to a fume wet-type magnesia desulfated waste-liquid recovery method which adopts flash-evaporating concentration for processing a magnesium sulfate solution, the steps are as follows: the first-effect concentrating step of the magnesium solution, using positive-pressure operation and using fresh vapor as a heat resource, and concentrating the magnesium sulfate solution to 20 percent to 25 percent; the second-effect step of the magnesium sulfate solution, heating the solution by using secondary vapor generated in the first-effect evaporation until the concentration of the magnesium sulfate solution reaches 30 percent to 35 percent; the triple-effect concentrating step of the magnesium solution, heating by triple vapor generated in the second-effect concentrating step by adopting an atmosphere condenser and an evacuator so that the triple-effect concentrating step is operated in a vacuum state, and concentrating the magnesium sulfate solution to the set concentration to form a super-saturation solution in the thrice-effect concentrating step of the magnesium solution; the crystallizing step of magnesium sulfate: conveying the super-saturation solution to a crystallizer to enable the magnesium sulfate to form the crystal of magnesium sulfate heptahydrate to be continuously separated out; and the recovery step of the magnesium sulfate heptahydrate. The invention can generate hydrous magnesium sulfate and achieve high recovery rate.

Description

technical field [0001] The invention relates to flue gas desulfurization, in particular to the fields of boiler, sintering machine flue gas wet magnesia desulfurization waste liquid recovery and the like. Background technique [0002] The flue gas of the coal power industry and the flue gas of the sintering machine used in the iron and steel industry have the following characteristics: [0003] Sulfur dioxide is low and unstable. [0004] There are two main ways to deal with flue gas: [0005] (1) Ammonia desulfurization technology [0006] Use liquid ammonia or ammonia water as an absorbent to remove sulfur dioxide in the flue gas of the sintering machine to reduce the emission of sulfur dioxide and dust. The by-product is ammonium sulfate fertilizer. [0007] This method is used in conjunction with the electron beam method and the pulsed corona method, and these two methods are not only expensive, but also difficult to apply to large-scale units because the equipment co...

Claims

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Application Information

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IPC IPC(8): B01D1/26B01D1/14B01D9/02F26B11/00
Inventor 于宁瑞华涵
Owner HEFEI GUOHUI ENVIRONMENTAL PROTECTION TECH
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