Compound additive for limestone-gypsum wet-process flue gas desulfurization

A wet flue gas desulfurization and compound additive technology, applied in gas treatment, separation methods, chemical instruments and methods, etc., can solve the problems of delayed onset time, short duration, long duration, etc., and achieve long duration , fast onset, prolonged effect

Inactive Publication Date: 2017-05-31
鄂尔多斯市瀚博科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inorganic additives can rapidly improve the desulfurization efficiency, but the dosage is large, the duration is short, and the consumption is high; the addition of additives is small, the duration is long, and the consumption is small, but the onset time is delayed; although the composite additive has the advantages of inorganic additives and organic additives Double advantages, but the formula is complicated, the price is more expensive, and the dosage is larger

Method used

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  • Compound additive for limestone-gypsum wet-process flue gas desulfurization
  • Compound additive for limestone-gypsum wet-process flue gas desulfurization
  • Compound additive for limestone-gypsum wet-process flue gas desulfurization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add the high-efficiency composite additive in the present invention in the 1# absorption tower and account for 550ppm of the total amount of the slurry, according to the following components and mass percentages: 40% adipic acid, 20% sodium acetate, 20% potassium acetate, dodecane Sodium phenyl sulfonate 10%, manganese sulfate 3%, polysiloxane 2%, sodium chloride 5%. At a unit load of 300MW, the SO2 inlet concentration of the desulfurization tower is 4195.3mg / Nm 3 , running 5 circulating slurry pumps, the concentration at the outlet of the desulfurization tower can reach 22.1mg / Nm 3 , the desulfurization efficiency is increased by 1.5%, and the slurry limestone is saved by 13.8%. The comparison of the main indicators of the blank test with additives and without additives is shown in Table 1.

Embodiment 2

[0035] Add the high-efficiency composite additive in the present invention to 1# absorption tower and account for 520ppm of the total amount of slurry, according to the following components and mass percentages: acetic acid 20%, adipic acid 20%, sodium formate 10%, sodium citrate 30% , Sodium Lauryl Sulfate 10%, Manganese Chloride 3%, Polyoxyethylene Ether 2%, Sodium Chloride 5%. When the load of the unit is 300MW, the SO2 inlet concentration of the desulfurization tower is 4215.4mg / Nm3 , running 5 circulating slurry pumps, the concentration at the outlet of the desulfurization tower can reach 25.9mg / Nm 3 , the desulfurization efficiency is increased by 1.5%, and the slurry limestone is saved by 10.9%. The comparison of the main indicators of the blank test with additives and without additives is shown in Table 2.

Embodiment 3

[0037] Add the high-efficiency composite additive in the present invention in the 1# absorption tower and account for 500ppm of the total amount of the slurry, according to the following components and mass percentages: 20% formic acid, 20% adipic acid, 20% sodium formate, 20% sodium acetate, Sodium Lauryl Sulfate 6%, Lauryl Sultaine 4%, Manganese Chloride 3%, Polysiloxane 2%, Sodium Sulfate 5%. When the unit load is 300MW, the SO2 inlet concentration of the desulfurization tower is 4227.8mg / Nm 3 , running 5 circulating slurry pumps, the concentration at the outlet of the desulfurization tower can reach 22.7mg / Nm 3 , the desulfurization efficiency is increased by 1.5%, and the slurry limestone is saved by 15.6%. Add additive and do not add additive blank test main index contrast, as shown in table 3; Add the real-time concentration monitoring of absorption tower outlet flue gas after adding additive of the present invention, as shown in Table 3 figure 1 shown. figure 1 It r...

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Abstract

The invention relates to a compound additive for limestone-gypsum wet-process flue gas desulfurization. The compound additive is prepared from the following components in percentage by mass: 25 percent to 50 percent of a limestone dissolving promoter, 20 percent to 60 percent of a pH (Potential of Hydrogen) buffering agent, 5 percent to 15 percent of a surfactant, 3 percent to 10 percent of an oxidization catalyst, 2 percent to 5 percent of a de-foaming agent and 2 percent to 10 percent of a correlated auxiliary agent. The compound additive provided by the invention combines the dual advantages of an inorganic additive and an organic additive of rapid effect, less use amount, long lasting time, less consumption and the like in a limestone-gypsum wet-process flue gas desulfurization system of a thermal power plant; the formula is simple and components have a low price and are easy to obtain; on the basis of not doing any engineering reconstruction, the absorption efficiency of SO2 can be greatly improved, the quality of gypsum can also be improved and the scaling and blocking of the system are reduced.

Description

technical field [0001] The invention relates to the field of limestone-gypsum wet flue gas desulfurization in thermal power plants, in particular to a composite additive for limestone-gypsum wet flue gas desulfurization. Background technique [0002] S0 from coal burning 2 Pollution has posed a serious threat to our country's atmospheric environment, especially the thermal power industry. In order to control S0 2 At the same time, the cost of desulfurization is reduced to the greatest extent. At present, more than 90% of domestic thermal power plants have established limestone-gypsum wet flue gas desulfurization systems. However, on the one hand, due to the increasingly tight supply of electric coal, the sulfur content of the coal used by existing boilers has increased significantly compared with the design value; on the other hand, due to the 2 Insufficient processing capacity design margin leads to a series of problems such as low desulfurization efficiency of wet flue ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50
CPCB01D53/80B01D53/50B01D2258/0283B01D2259/126
Inventor 赵长森夏伟周斌王会昌牛强
Owner 鄂尔多斯市瀚博科技有限公司
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