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Sulfur dioxide absorbent with two base salt mud as raw materials

A technology of sulfur dioxide and absorbent, which is applied in the field of solid waste resource utilization to achieve the effects of cost saving, energy consumption reduction and high desulfurization efficiency

Active Publication Date: 2016-03-02
CHINASALT JINTAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 with two base salt mud as raw materials
  • Sulfur dioxide absorbent with two base salt mud as raw materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Take the salt mud of two alkali methods, 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 94.8, and the NaCl content is 0.97. Prepare a slurry with a solid content of 15%, then add 0.1 citric acid (purity ≥ 97%) in total dry weight of salt mud, and mix thoroughly to make a desulfurization absorbent slurry.

[0046] 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 60 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 at 145°C and the flow rate is controlled at 380,000m 3 / h,...

Embodiment 2

[0049] Take the two-alkali salt mud, wash it once with 2 times the weight of water, use a vacuum drum filter to dehydrate, and the CaCO in the dry basis 3 The content is 96.4, and the NaCl content is 0.84. Prepare a slurry with a solid content of 10%, and then add 0.2 citric acid (purity ≥ 97%) in dry weight of salt mud, 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 controlled at 380,000m 3 / h, after 2 h...

Embodiment 3

[0053] Take the two-alkali 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 96.8, and the NaCl content is 0.81. Prepare a slurry with a solid content of 15%, then add 0.2% citric acid (purity ≥ 97%) in salt mud dry basis, 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 49 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 380,000m 3 / h, after 2 hours of s...

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Abstract

The invention discloses a sulfur dioxide absorbent prepared from a two-alkali salt slurry. A preparation method of the absorbent comprises the following steps: washing the two-alkali 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. In the invention, limestone powder is substituted by the processed two-alkali salt slurry, thereby multiple purposes comprising the change of wastes to wastes, the change of wastes to valuables, energy saving, emission reduction desulphurization cost reduction and the like are realized.

Description

technical field [0001] The invention relates to wet desulfurization, in particular to a sulfur dioxide absorbent using two-alkali salt mud as a raw material, and belongs to the field of environmental protection and the technical field of resource utilization of solid waste. Background technique [0002] Brine purification, also known as brine pretreatment, is one of the key processes in the salt production process, the purpose is to remove the Ca in the original brine 2+ , Mg 2+ The ions are separated before entering the heating chamber. Salt mud is the general term for various inorganic salts discharged during the process. [0003] Two-alkali brine purification is to use caustic soda (NaOH) to remove Mg in brine 2+ , with Mg(OH) 2 Precipitation is removed, using soda ash (NaCO 3 ) will Ca in the brine 2+ CaCO 3 Precipitate form is removed. The basic reaction formula of the two-alkali method is as follows: [0004] 2OH - +Mg 2+ →Mg(OH) 2 ↓ [0005] Ca 2+ +CO 3...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/50B01D53/80
Inventor 韩锋陈留平郝剑波袁斌谢兴胜
Owner CHINASALT JINTAN
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