Antifoaming agent for flue gas desulphurization system and preparing method thereof

A kind of desulfurization system, technology of defoamer

Inactive Publication Date: 2017-01-18
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Sulfur dioxide is extremely harmful to the environment, causing acid rain and acid fog, corrosive to the environment, and carcinogenic to the human body
However, in the actual operation of the power plant, there are also many unstable factors such as large fluctuations in coal quality, uneven coal types, and fluctuations in boiler power generation loads, which greatly interfere with the operation of the desulfurization tower.
[0005] Due to fluctuations in operation, the desulfurization tower slurry will generate a large amount of foam in the slurry pool, which will affect the measurement of the liquid level and directly reduce the actual volume of the effective oxidation zone of the slurry, and excessive foam will cause overflow and affect the power of the circulating pump, reducing Circulation volume
[0006] Existing defoamers have problems such as low efficiency, inapplicability to high-solid slurry, and inconvenient dosing, and cannot be applied to flue gas desulfurization systems with high chlorine and fluoride ions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: A kind of defoamer of limestone-gypsum wet flue gas desulfurization system of a thermal power plant of the present invention, calculated by mass percentage, its composition is as follows: modified silicon polyether 30%, modified siloxane 10%, Fatty acid salt 10%, polyethylene glycol 5%, calcium chloride 4%, white carbon black 1%, aluminum sulfate 5%, deionized water 35%.

[0029] Preparation process: Add deionized water, fatty acid salt, and polyethylene glycol in proportion to the reaction kettle, and stir and mix at 150°C for 10 minutes. Continue to add modified silicon polyether, modified siloxane, calcium chloride, white carbon black and aluminum sulfate, then stir and raise the temperature to 160°C, keep warm and stir for 3h. After the product is ground by a colloid mill for 15 minutes, it is cooled to room temperature and solidified into a solid product.

Embodiment 2

[0030] Embodiment 2: A limestone-gypsum wet flue gas desulfurization system defoamer of a thermal power plant of the present invention, calculated by mass percentage, its composition is as follows: modified silicon polyether 10%, dimethyl silicone oil 30%, fat Salt 15%, ethylene bis stearamide 5%, sorbitol fatty acid ester 5%, modified bentonite 2%, white carbon black 1%, polyaluminium 2%, deionized water 30%.

[0031] Preparation process: Add deionized water, fatty acid salt, ethylene bisstearamide, and sorbitol fatty acid ester in proportion to the reaction kettle, and stir and mix at 150°C for 20 minutes. Continue to add modified silicon polyether, dimethyl silicone oil, modified bentonite, white carbon black and polyaluminum, then stir and raise the temperature to 180°C, keep warm and stir for 4h. After the product is ground by a colloid mill for 10 minutes, it is cooled to room temperature and solidified into a solid product.

Embodiment 3

[0032] Embodiment 3: A kind of defoamer of limestone-gypsum wet flue gas desulfurization system of a thermal power plant of the present invention, calculated by mass percentage, its composition is as follows: simethicone 50%, fatty acid salt 10%, dodecane Sodium sulfonate 5%, modified bentonite 1%, white carbon black 2%, aluminum sulfate 2%, deionized water 30%.

[0033] Preparation process: Add deionized water, fatty acid salt, and sodium dodecylsulfonate in proportion to the reaction kettle, and stir and mix at 150°C for 30 minutes. Continue to add simethicone, modified bentonite, white carbon black and aluminum sulfate, then stir and heat up to 170°C, keep warm and stir for 3h. After the product is ground by a colloid mill for 15 minutes, it is cooled to room temperature and solidified into a solid product.

[0034] Examples of effect tests:

[0035] The actual desulfurization system slurry is used as a sample, and a quartz glass cylinder with a diameter of 5 cm and a hei...

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Abstract

The invention discloses an antifoaming agent for a flue gas desulphurization system. The antifoaming agent is prepared from, by mass, 30%-60% of antifoaming components, 10%-20% of foam inhibition components, 5%-10% of an emulsion stabilizer, 5%-10% of a synergist and the balance deionized water. The antifoaming agent is suitable for a thermal-power-plant limestone-gypsum wet flue gas desulfurization system adapting to high chlorine, fluorion and solid-content slurry liquid and aeration, and has the advantages of being good in antifoaming effect and long in foam inhibition time; the foaming characteristic of desulfuration slurry liquid can be improved, the stability of a slurry-liquid oxidation zone is effectively controlled, the foam content of the slurry liquid is reduced, losses of the slurry liquid of a circulating pump are reduced, the circulation amount of the slurry liquid is increased, and it is avoided that foam overflows to a pipe zone, the slurry liquid is deposited in a pipe, and scale formation corrosion is caused.

Description

technical field [0001] The invention relates to a chemical auxiliary agent, in particular to a desulfurization defoamer used in a limestone-gypsum wet flue gas desulfurization system of a thermal power plant. Background technique [0002] my country is a large coal producing country, and the energy structure determines that my country's market structure is dominated by thermal power generation. Taking 2014 as an example, my country's coal production reached 3.87 billion tons, nearly half of the world's output; in the same year, my country's thermal power generation was 398 billion kWh, accounting for more than 70% of the country's coal consumption, and it is the main source of air pollution. Among them, the emission of sulfur dioxide in flue gas accounts for more than 90% of the total emission of sulfur dioxide in the country, and the total emission in 2014 reached 19.744 million tons. [0003] Sulfur dioxide is extremely harmful to the environment, causing acid rain and ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04B01D53/80B01D53/50
CPCB01D19/0409B01D53/502B01D2251/404
Inventor 王超王昊石硕年秦立娟陶蕾
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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