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Multifunctional composite additive for wet-method flue gas desulfuration process and using method thereof

A wet flue gas desulfurization and compound additive technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the desulfurization efficiency decline, system scaling and overflow, affecting the comprehensive utilization of desulfurized gypsum, and the crystallization of desulfurized gypsum. Defects and other problems, to achieve the effect of inhibiting the formation of soft scale, facilitating the operation of the system, and improving the utilization rate of calcium

Inactive Publication Date: 2011-04-20
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing additives often cause poor crystallization of desulfurized gypsum, which affects the subsequent comprehensive utilization of desulfurized gypsum; some desulfurized additives have a single effect and cannot simultaneously solve the problems of desulfurization efficiency decline, system scaling and overflow

Method used

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  • Multifunctional composite additive for wet-method flue gas desulfuration process and using method thereof
  • Multifunctional composite additive for wet-method flue gas desulfuration process and using method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The compound additive of this embodiment is made up of following components: nylon acid, sodium humate, organosilicon defoamer, potassium formate, manganese sulfate and p-hydroxybenzoic acid, nylon acid, sodium humate, organosilicon defoamer in compound additive The most preferred mass percentages of foaming agent, potassium formate, manganese sulfate and p-hydroxybenzoic acid are respectively: 40%, 40%, 8%, 4%, 4%, 4%, and the silicone defoamer is modified Polysiloxane, the content of adipic acid in the nylon acid is greater than 50%.

[0025] Get 80g of calcium carbonate, 100g of calcium sulfite and dissolve it in 1L of deionized water, add compound additives of different qualities respectively, and measure the dissolution rate of limestone on the calcium carbonate dissolution rate test bench with the method of dilute sulfuric acid titration, the experiment shows that , adding 400mg / L of composite additives increases the dissolution rate of limestone by 1.4 times; add...

Embodiment 2

[0027] The compound additive of this embodiment is made up of following components: nylon acid, sodium humate, organosilicon defoamer, potassium formate, manganese sulfate and p-hydroxybenzoic acid, nylon acid, sodium humate, organosilicon defoamer in compound additive The most preferred mass percentages of foaming agent, potassium formate, manganese sulfate and p-hydroxybenzoic acid are respectively: 40%, 40%, 8%, 4%, 4%, 4%, and the silicone defoamer is modified Polysiloxane, the content of adipic acid in the nylon acid is greater than 50%. .

[0028] Get 4g of calcium carbonate, 5g of calcium sulfate and mix with 400ml of deionized water, add 20mg of compound additives and the mixed solution, titrate with 0.95mol / L dilute sulfuric acid and the same titration speed, the change rule of slurry pH value with titration time is as follows figure 1 shown. The figure shows that the composite additive has a buffering effect on the pH of the slurry, which facilitates the operation ...

Embodiment 3

[0030] The compound additive of this embodiment is made up of following components: nylon acid, sodium humate, organosilicon defoamer, potassium formate, manganese sulfate and p-hydroxybenzoic acid, nylon acid, sodium humate, organosilicon defoamer in compound additive The most preferred mass percentages of foaming agent, potassium formate, manganese sulfate and p-hydroxybenzoic acid are respectively: 40%, 40%, 8%, 4%, 4%, 4%, and the silicone defoamer is modified Polysiloxane, the content of adipic acid in the nylon acid is greater than 50%. .

[0031] Add the desulfurization compound additive to the limestone slurry in the limestone gypsum desulfurization experimental system, and the addition amount is 400mg / L. The measured 24-hour desulfurization efficiency of the system is above 93%, which is 5% higher than that without desulfurization compound additive.

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Abstract

The invention belongs to the technical field of a limestone-gypsum wet-method flue gas desulfuration process and relates to a multifunctional composite additive for a wet-method flue gas desulfuration process and a using method thereof. The composite additive comprises the following components in percentage by mass: 31 to 45 percent of nylon acid, 31 to 45 percent of sodium humate, 6 to 9 percentof organic silicon defoaming agent, 2 to 5 percent of potassium formate, 2 to 5 percent of manganese sulfate and 2 to 5 percent of p-hydroxybenzoic acid. The composite additive can promote the dissolution of the limestone and reduce the using amount of the limestone, has an enhancement factor for improving an absorption reaction of sulfur dioxide (SO2), accelerates the migration speed of SO2 gas liquid, promotes the adsorption reaction of the SO2 in a liquid membrane, inhibits the soft scales of calcium sulfate (CaSO3) from generating, improves the pH value buffer capacity of limestone slurry, slows down the reducing speed of the pH value in the process of absorbing the SO2 by the desulfuration slurry continuously, and achieves the effect of avoiding bubbling and overflow of the desulfuration slurry.

Description

technical field [0001] The invention belongs to the technical field of limestone-gypsum wet flue gas desulfurization technology, and in particular relates to a multifunctional device for wet flue gas desulfurization technology that improves system desulfurization efficiency, prevents system fouling, and prevents foaming and overflow in the desulfurization tower. Composite additives and methods of use thereof. Background technique [0002] There are various sulfur dioxide control methods. There are more than 200 sulfur dioxide control technologies researched and developed by various countries in the world. Among the coal-fired flue gas desulfurization methods, the limestone-gypsum wet desulfurization technology is due to the cheap and easy availability of limestone, high desulfurization efficiency, and mature technology. , high equipment commissioning rate, strong unit adaptability, comprehensive utilization of desulfurization by-products, etc., which have been widely used al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50
Inventor 陈传敏刘松涛
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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