Flue gas desulfurization method

A technology for flue gas and coal-fired flue gas, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles, and can solve problems such as high operating costs

Active Publication Date: 2014-02-12
DAZHOU HENGCHENG ENERGY GROUP
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  • Abstract
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  • Claims
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Problems solved by technology

In the traditional boiler flue gas desulfurization process, lime and caustic soda are generally used as desulfurizers, and the operating cost is too high

Method used

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Embodiment 1

[0039] The calcium-magnesium slag is washed with water, and the amount of water is 150% of the mass of the calcium-magnesium slag. The washed calcium-magnesium slag is mixed with water to prepare a salt mud slurry with a mass percentage of 10%.

[0040] The untreated boiler coal-fired flue gas is transported to the top of the cooling tower by an induced draft fan, and the top of the tower enters the cooling tower. The salt mud slurry is also pumped in from the top of the tower. After being atomized and dispersed, it is in parallel contact with the high-temperature coal-fired flue gas to absorb heat and reduce the temperature of the flue gas. It is a first-class flue gas at 75℃ The temperature-reducing desulfurization slurry is repeatedly used to cool the coal-fired flue gas until its PH value is 7, and the temperature-reducing desulfurization slurry is discharged, and the solid-liquid separation is carried out to obtain calcium sulfate and desulfurization mother liquor. The sepa...

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Abstract

The invention provides a flue gas desulfurization method which comprises the following steps: calcium and magnesium slag is configured to salty mud slurry after washed by water; coal-fired flue gas and the salty mud slurry or primary desulfurized circulatory slurry are subjected to parallel-flow cooling, and simultaneously, part of sulfur dioxide in the coal-fired flue gas is absorbed to obtain primary flue gas and cooled desulfurization slurry; the cooled desulfurization slurry and the coal-fired flue gas are subjected to parallel-flow cooling repeatedly until the pH (potential of hydrogen) value of the cooled desulfurization slurry is 6-7, and solid-liquid separation is performed to obtain calcium sulfate and a desulfurization mother liquid; the primary flue gas and the salty mud slurry or secondary desulfurized circulatory slurry are subjected to reversed-flow desulfurization to obtain secondary flue gas and primary desulfurized circulatory slurry; and the secondary flue gas and the salty mud slurry are subjected to reversed-flow desulfurization to obtain purified flue gas and secondary desulfurized circulatory slurry. With the adoption of the flue gas desulfurization method, the waste calcium and magnesium slag is recycled, the pollution treatment cost of an enterprise is reduced, moreover, sulfur dioxide is effectively removed, and cleanness and environmental protection are achieved.

Description

Technical field [0001] The invention relates to the field of reuse of salt chemical waste residues, in particular to a method for flue gas desulfurization. Background technique [0002] In the brine purification process, the salt industry undergoes removal of Ca 2+ , Mg 2+ The resulting solid waste is commonly called calcium magnesium slag, and its composition is complex, mainly composed of a mixture of insoluble calcium sulfate, calcium carbonate, magnesium hydroxide, and soluble salts. Because the composition of calcium and magnesium slag is complex, the content of valuable components is low, and it is difficult to filter, its comprehensive utilization is difficult. At present, the common domestic treatment methods for calcium and magnesium slag are as solid waste for well injection, landfill, and stacking. These treatment methods waste resources and pollute the environment, and because the treatment also requires investment, it also increases the company’s cost. [0003] As th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50
Inventor 唐兵安普伟王思相
Owner DAZHOU HENGCHENG ENERGY GROUP
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