Power plant desulfurization defoaming agent defoaming solution

Most power plants in my country use coal for power generation. Desulfurizers are used in the power generation process of thermal power plants. During the operation of wet desulfurization systems, slurry foaming is also an important factor affecting slurry quality and desulfurization efficiency. The foaming of the slurry can be controlled by adding a defoamer to ensure the stable operation of the desulfurization system. The following is Nanhui provides customers with desulfurization slurry defoaming solutions.

(Picture: Desulfurization power generation scenario)

1. Customer information: Zhongyi Company encountered the problem of foaming of desulfurization slurry in power plants, and contacted Nanhui through the Internet, hoping to find a desulfurization and defoaming agent that can withstand high temperatures.

2. Sample information: desulphurization slurry

Customer request

1. The desulfurization defoamer can be used at a temperature of 40 degrees.

2. The defoamer has good effect, will not increase the viscosity of the slurry, and will not affect the normal process operation.

(Picture: Sample of Nanhui desulfurization defoamer)

Solution

1. The cause of desulfurization foaming

(1) During the normal operation of the desulfurization absorption tower, oxidizing air is blown into the desulfurization absorption tower through an oxidation fan to oxidize calcium sulfite into calcium sulfate. In this process, under the action of the agitator and spraying the slurry, the oxidizing air enters the slurry and forms bubbles on the liquid surface. When the slurry is more viscous, the viscous force hinders the flow of the liquid in the liquid film, and the foam is relatively stable to form a foam layer.

(2) With the circulation of the desulfurization slurry, the slurry continuously absorbs impurities such as surfactants, dust, heavy metal ions, and oil droplets in the flue gas, and the surface tension difference between the surface and the inner solution increases. When the local liquid film becomes thinner, the liquid with higher surface tension in the inner layer is exposed, forming a tension gradient at the liquid surface, and the liquid with lower surrounding tension will move there to prevent it from further thinning, so the liquid film has a stronger The stability of the foam is longer.

(Picture: Desulfurization power generation scenario)

2. The hazards of desulfurization and foaming

(1) The foaming of the desulfurization slurry will affect the desulfurization system to varying degrees, such as insufficient combustion when the unit is started or in an accident state.

(2) Some surface-active impurities enter the absorption tower, which may cause slurry bubbles and even limestone "blindness", resulting in slurry poisoning, and thus affecting desulfurization efficiency.

(3) When the amount of slurry bubbles in the desulfurization absorption tower is large, the actual liquid level in the absorption tower is low, resulting in insufficient gypsum oxidation time and high sulfite content, which will also reduce the desulfurization efficiency.

(4) When the slurry bubbles are serious, part of the slurry may overflow into the booster fan, and when it is serious, the blades may break, affecting the safe operation of the entire desulfurization system.

3. Nanhui targeted experimental solutions

4. Recommended desulfurization defoamer

Nanhui power plant desulfurization defoamer is specially developed for desulfurization slurry foaming system. It has transparency, good capacity, long-term defoaming and antifoaming performance, which can control the false high liquid level caused by the liquid level foam in the tower and prevent the slurry from overflowing. Flow, alleviate the fouling and clogging of the heat exchanger (GGH) caused by foam.

5. Features of desulfurization defoamer

(1) Tests should be carried out to determine applicability before use;

(2) Stir gently before use;

(3) Calculation of dosing amount: Generally, the addition amount of defoaming agent is 0.1%~0.3%, and the final use amount is based on actual experiments. Under normal operation, the amount of slurry is the standard. This product should be dosed in a one-off impact mode for the first time, and then added once every 24 hours, but the actual dosage is determined by the composition of the foaming liquid, the amount of flue gas, the composition of coal and the combustion process. Conditions, absorbents, and sulfur dioxide content. The user can finally determine the dosage according to the actual situation.

(4) In the process of continuous addition, the pump can be used to calculate the addition, and it can be added once in the batch process.

Nanhui metalworking fluid defoamer is added in the production, which can control the foam from the production source, optimize the formula of the metalworking fluid, reduce the surface tension of the system, and reduce the foaming power. The defoaming agent can also be added during the use of metalworking fluids, generally about three thousandths of the foaming system. The addition amount is small, which can quickly defoam the foam and inhibit foam regeneration for a long time.

The source manufacturer of Nanhui defoamer can solve various industrial foam problems in a targeted manner. If you encounter bubble problems in related industries, you can call Nanhui technical specialist Yoyo +86 134 28601010