Sulfur dioxide absorbent using secondary salt mud from lime flue gas process as raw material

A lime flue gas and sulfur dioxide technology is applied in the fields of environmental protection and solid waste resource utilization to achieve the effects of high desulfurization efficiency, simplified process and reduced desulfurization cost.

Active Publication Date: 2015-10-28
CHINASALT JINTAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, filter mud is simply used for desulfurization, and its actual desulfurization effect does not exceed that of limestone powder.

Method used

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  • Sulfur dioxide absorbent using secondary salt mud from lime flue gas process as raw material
  • Sulfur dioxide absorbent using secondary salt mud from lime flue gas process as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Take the limestone flue gas method secondary salt mud, wash it once with the same weight of water, use a vacuum drum filter to dehydrate, and the CaCO in the dry basis 3 The content is 96.3, and the NaCl content is 0.79. Prepare a slurry with a solid content of 15%, then add citric acid (purity ≥ 97%) with a total weight of 0.1% of salt mud on a dry basis, and mix thoroughly to make a desulfurization absorbent slurry.

[0045] Using the electric power industry standard of the People's Republic of China ("Determination of the reaction rate of limestone powder for wet flue gas desulfurization" DL / T943-2005), the activity of calcium carbonate in the prepared slurry was tested.

[0046] The test results of this example show that when the conversion rate of calcium carbonate is 0.8, the consumption time is 58 minutes.

[0047] Desulfurize the flue gas produced by three 75t / h circulating fluidized bed boilers in a thermal power plant. The flue gas temperature is controlled a...

Embodiment 2

[0049] Take limestone flue gas method secondary salt mud, wash it once with 2 times the weight of water, use a vacuum drum filter to dehydrate, the dry basis of CaCO 3 The content is 97.4 and the NaCl content is 0.73. Prepare a slurry with a solid content of 10%, then add citric acid (purity ≥ 97%) with a total weight of 0.2% of salt mud on a dry basis, and mix thoroughly to make a desulfurization absorbent slurry.

[0050] Using the electric power industry standard of the People's Republic of China ("Determination of the reaction rate of limestone powder for wet flue gas desulfurization" DL / T943-2005), the activity of calcium carbonate in the prepared slurry was tested. The test results show that when the conversion rate of calcium carbonate is 0.8, the consumption time is 56 minutes.

[0051] Desulfurize the flue gas produced by three 75t / h circulating fluidized bed boilers in a thermal power plant. The flue gas temperature is controlled at 145°C and the flow rate is contro...

Embodiment 3

[0053] Take the limestone flue gas method secondary salt mud, wash it twice with the same weight of water, use a vacuum drum filter to dehydrate, and the CaCO in the dry basis 3 The content is 97.2, and the NaCl content is 0.74. Prepare a slurry with a solid content of 15%, then add 0.2% citric acid (purity ≥ 97%) in total dry weight of salt mud, and mix thoroughly to make a desulfurization absorbent slurry.

[0054] Using the electric power industry standard of the People's Republic of China ("Determination of the reaction rate of limestone powder for wet flue gas desulfurization" DL / T943-2005), the activity of calcium carbonate in the prepared slurry was tested. The test results show that when the conversion rate of calcium carbonate is 0.8, the consumption time is 51 minutes.

[0055] Desulfurize the flue gas produced by three 75t / h circulating fluidized bed boilers in a thermal power plant. The flue gas temperature is controlled at 145°C and the flow rate is controlled at...

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Abstract

The invention discloses a sulfur dioxide absorbent prepared from a lime-flue gas secondary salt slurry. A preparation method of the absorbent comprises the following steps: washing the lime-flue gas secondary salt slurry with water, adding water to a slurry having a solid content of 5-30%, adding an organic acid additive having a mass being 0.05-1% of the mass of the salt slurry to the obtained slurry, and uniformly mixing. A production technology using a solid waste as a desulphurization raw material has the advantages of simple flow, low apparatus requirements, high desulphurization efficiency, reduction of the consumption of the limestone powder, realization of the recycle of the salt slurry, and large social environmental and economic benefits.

Description

technical field [0001] The invention relates to the application of secondary salt mud using lime flue gas method in wet desulfurization of thermal power plants, in particular to the replacement of limestone in wet desulfurization by limestone flue gas method secondary salt mud in the brine purification process of salt manufacturing enterprises The invention discloses a method for desulfurizing flue gas with powder, and belongs to the field of environmental protection and the technical field of resource utilization of solid waste. Background technique [0002] The brine purification process is a key process for the salt industry to improve the purity of refined salt products, reduce the impurity content in salt, and improve the whiteness of salt products. ; It is one of the important measures to improve the comprehensive utilization rate of resources and be used in salt chemical production; it is one of the important ways to reduce production costs in the salt industry. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/80B01D53/50
Inventor 陈留平韩锋袁斌郝剑波李伟
Owner CHINASALT JINTAN
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