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A 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: 2016-03-16
DAZHOU HENGCHENG ENERGY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A flue gas desulfurization method

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Embodiment 1

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

[0040] The untreated boiler coal-fired flue gas is transported to the top of the cooling tower by the 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, and after being atomized and dispersed, it contacts with the high-temperature coal-fired flue gas in parallel flow to absorb heat and cool down the flue gas. After being processed by the cooling tower, the desulfurized slurry and temperature It is the primary flue gas at 75°C. The cooling and desulfurization slurry is repeatedly used for cooling the coal-fired flue gas until the pH value is 7, then the cooling and desulfurization slurry is discharged, and solid-liquid separation is performed to...

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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 in the salt industry, after Ca removal 2+ , Mg 2+ The solid waste produced is commonly known as calcium-magnesium slag, and its composition is complex, mainly composed of insoluble calcium sulfate, calcium carbonate, magnesium hydroxide and soluble salts. Due to the complex composition of calcium-magnesium slag, low content of valuable components, and difficulty in filtering, its comprehensive utilization is difficult. At present, the common domestic treatment methods for calcium-magnesium slag are well injection, landfill, and stacking as solid waste. These treatment methods not only waste resources, but also pollute the environment, and because the treatment requires investment, it also increases the cost of the enterprise. cost. [0003] As the main fu...

Claims

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Application Information

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Patent Type & Authority Patents(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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