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A kind of desulfurization process of brine purification waste residue

A technology of brine purification and desulfurization process, applied in the field of desulfurization, can solve the problems of cumbersome operation, adverse impact on the ecological environment, high operating cost, etc., and achieve the effects of solving environmental pollution problems, reducing desulfurization investment, and saving raw materials for brine making

Active Publication Date: 2016-05-25
HUNAN XIANGHENG SALT CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The flue gas desulfurization of existing power plants cannot solve the following problems: first, desulfurization requires desulfurization raw materials, and the operating cost is high; second, the cost of waste residue treatment after desulfurization is high, small power plants can hardly form a processing scale, and large power plants have high utilization costs
Lime-gypsum desulfurization uses lime and limestone as desulfurizers, and the desulfurization products calcium sulfite or calcium sulfate are mostly discarded, often causing secondary pollution; double-alkali desulfurization is to add alkaline substances such as sodium carbonate and sodium hydroxide to the solution , Precipitate calcium and magnesium ions in it, reduce the impurity content in the product, and generally treat impurities as waste residue for landfill treatment, causing adverse effects on the ecological environment
[0005] CN102553423A disclosed on July 11, 2012 a method for removing sulfur dioxide in flue gas with brine purification slag, in which the brine purification slag, circulating clear water and industrial water from the sedimentation tank were prepared in proportion under stirring conditions The desulfurization agent slurry is pumped into the desulfurization tower through the desulfurization circulation pool for flue gas desulfurization, and then the desulfurization slurry returns to the desulfurization circulation pool. for pulping; however, the concentration of brine purified slag is reduced after dilution, thereby reducing the SO 2 The absorption efficiency and absorption speed are high, and the precipitated desulfurization slag has not been properly treated. For power plants, this method is relatively cumbersome to operate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A brine purification waste residue desulfurization process, using the lime-flue gas method for brine purification, that is, adding CaO—CO to the brine 2 , using quicklime to react with water to generate Ca(OH) 2 in "OH - " except Mg 2+ , with CO 2 with the generated OH - The reaction produces "CO 3 2- "In addition to Ca 2+ , and its main reaction formula is:

[0021] Primary purification reaction: CaO+H 2 O=Ca(OH) 2

[0022] Ca(OH) 2 +MgSO 4 =Mg(OH) 2 ↓+CaSO 4 ↓

[0023] Ca(OH) 2 +Na 2 SO 4 =2NaOH+CaSO 4 ↓

[0024] Secondary purification reaction: CO 2 +2NaOH=Na 2 CO 3 +H 2 o

[0025] Na 2 CO 3 +CaSO 4 =CaCO 3 ↓+Na 2 SO 4

[0026] The waste residue used for desulfurization is mainly the waste residue of the primary purification reaction, and its main component is Ca in the liquid phase. 2+ 、Na + , SO4 2- , Cl - , OH - Ionic and solid-phase CaSO 4 , Mg(OH) 2 , the main component in desulfurization is Na in the liquid phase + , OH -...

Embodiment 2

[0038] A brine purification waste residue desulfurization process, the difference from Example 1 is that the main component of the waste residue of the primary purification reaction is Ca in the liquid phase 2+ 、Na + , SO4 2- , Cl - , OH - Ionic and solid-phase CaSO 4 , Mg(OH) 2 , the main component in desulfurization is Na in the liquid phase + , OH - Mg(OH) in ion and solid phase 2 , where OH - The concentration is 0.7g / L, Mg(OH) 2 The concentration accounts for 15% of the solid phase.

[0039] The desulfurization efficiency of the waste residue produced by the primary purification of brine by the lime-flue gas method can reach more than 93%.

Embodiment 3

[0041] A brine purification waste residue desulfurization process, the difference from Example 1 is that the main component of the waste residue of the primary purification reaction is Ca in the liquid phase 2+ 、Na + , SO4 2- , Cl - , OH - Ionic and solid-phase CaSO 4 , Mg(OH) 2 , the main component in desulfurization is Na in the liquid phase + , OH - Mg(OH) in ion and solid phase 2 , where OH - The concentration is 1.2g / L, Mg(OH) 2 The concentration accounts for 20% of the solid phase.

[0042] The desulfurization efficiency of the waste residue produced by the primary purification of brine by lime-flue gas method can reach more than 95%.

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PUM

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Abstract

The invention relates to a brine purification waste-residue desulfurization process. The process is characterized in that the waste residue produced after the brine is purified is used as a desulfurization agent and is pumped into a desulfurization tower through a reaction barrel to be contacted with the smoke and to be desulfurized, and the desulfurization waste residue after the desulfurization is returned to a well to recover halogen and to be recycled. By adopting the brine purification waste-residue desulfurization process, the running cost is low, the one-time investment cost is low, the waste-residue treatment cost is low, the absorption efficiency of SO2 is improved, and a purpose for treating the waste by utilizing the waste can be realized.

Description

technical field [0001] The invention relates to the field of desulfurization, in particular to a brine purification waste residue desulfurization process for power plants. Background technique [0002] With the strengthening of the country's environmental governance, domestic power plants have launched flue gas desulfurization projects one after another, and have achieved certain results. For the salt industry, the boiler flue gas produced by the power station equipped with vacuum salt production contains a large amount of SO 2 Harmful gases and some other substances, SO 2 Without treatment, it will be directly discharged into the atmosphere and cause serious pollution to the environment. Therefore, flue gas desulfurization is also an inevitable development trend of waste gas treatment in the salt industry in the future. [0003] The flue gas desulfurization of existing power plants cannot solve the following problems: first, desulfurization requires desulfurization raw m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/50
Inventor 赵昌武周立葆
Owner HUNAN XIANGHENG SALT CHEM
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