Why does power plant flue gas desulfurization bubble and how to solve it?

Impurities are mixed into the slurry, and the operation of the equipment produces foam, limestone and sulfide.

The resulting foam, desulfurization wastewater is not treated in time to produce foam. Foam problems in the desulfurization process are very common, but the impact is not small, foam will directly affect the efficiency of flue gas desulfurization, and will also bring a variety of negative effects. It is recommended to use a desulfurization defoamer for power plants to deal with the problem of desulfurization foaming.

Power plant desulfurization typically uses either limestone-gypsum or seawater desulfurization, both of which produce large amounts of absorber slurry. If there is foaming of the absorption tower slurry, it may lead to a decrease in absorption efficiency and will also cause certain problems in the subsequent treatment process.

Here are a few workarounds that might work:

1.Increase antifoam: A certain amount of antifoam, such as silicone oil, can be added to reduce the foaming of the absorption tower slurry. However, it should be noted that the amount of antifoam should not be too much, otherwise it may cause pollution to subsequent treatment and even the environment.

2.Adjust the feed concentration: when the slurry concentration of the absorption tower is too high or too low, it is easy to bubble and hit the hail pie. Therefore, it is necessary to adjust the feed concentration according to the actual situation so that it is within the optimal range.

3.Changing operating conditions: Operating conditions such as temperature and pressure in the absorption tower can also affect foam generation. Try adjusting these conditions to find the right parameters to reduce the foaming of the absorber slurry.

4.Cleaning the absorption tower: If none of the above methods are effective, consider cleaning the absorption tower. The absorber can be cleaned with a cleaning agent to remove dirt, impurities, etc., thereby reducing foam generation.

It should be noted that different types of absorbents and antifoams have different application scenarios and requirements in industrial production, and the appropriate products should be selected according to the actual situation. In addition, the treatment process of the absorption tower slurry also needs to be strictly controlled to ensure the safety and health of the environment.

The reasons could be:

1. The combustion problem of the boiler may be due to the incomplete combustion of the oil and the unburned inert impurities entering the absorption tower, resulting in an increase in the content of organic matter or heavy metal ions in the slurry, and a saponification reaction occurs, which causes the surface tension of the slurry to increase, thus making the surface of the slurry blister;

2. The MGO content in limestone exceeds the standard, and a large amount of foam will be produced by reacting with sulfur oxides;

3. The water quality of the supplementary water of the absorption tower is not up to standard, and the dehydration system or wastewater treatment system cannot be put into operation normally, resulting in the gradual deterioration and foaming of the slurry.

4. Due to the disturbance of the bottom slurry, the pulse disturbance of the pump or the stirrer stirring, the foam is generated.

There are generally two solutions:

1. Install a mist eliminator at the entrance, and the use of a mist eliminator can also reduce foam to a great extent.

2. Use special defoamer for defoaming, it is recommended to use the flue gas desulfurization defoamer launched by Zhongwan, which has good heat resistance, strong acid and alkali resistance, and can maintain defoaming and foam inhibition ability under various conditions.

The foam generated by desulfurization of power plants will affect the washing process of limestone slurry, and the foam will also cause the slurry to overflow, resulting in the loss of raw materials. Foam can affect the exchanger structure and clog; Foam will directly affect the efficiency of desulfurization, and overflowing slurry will also cause environmental pollution.

If there is a foam problem in the flue gas desulfurization process of the power plant, it is recommended to use the power plant desulfurization defoamer to deal with it.

The reason for the blackening is impurities. Ordinary slurry should be yellowish-brown, if there is foam and blackening, it should be caused by dust and oil.

1.Foam is unavoidable in wet FGD absorption towers, your main circulation pump starts to churn the slurry, the spray layer on top refines the droplets, and your oxidation (roots) fan brings a lot of air to the slurry after starting. In this kind of "rain in the sky and blowing bubbles in the water" working condition, the starting point foam is normal; When you start, you are in alkaline condition, alkaline condition is very intense and frequent, in addition, after a period of operation, the condition is stable, your slurry pH value is between 4 6, it is an acidic condition, and the slurry is not easy to bubble under acidic conditions.

2.The blackening of the foam is a sign of dirtiness, check the amount of dust carried by your dust collector, and check whether your oil circuit is leaking into the slurry. This is a system project, you may have to work a little harder, and also see if 90% of the plaster on your vacuum belt dehydrator is blackened.

Hope mine is helpful to you.

Foam is unavoidable in wet FGD absorption towers; At the time of start-up, you are in alkali and bright front sales condition.

Hope mine is helpful to you. The foam blackening is a dirty performance, the alkaline working condition is very intense and frequent, it is an acidic working condition, your oxidation (roots) fan starts to bring a lot of air to the slurry, the reason is the impurities, the spray layer above will refine the droplets.

1. In addition, see if 90% of the gypsum on your vacuum belt dehydrator is blackened, if there is foam and blackening, it should be caused by dust and oil, and the working condition of Jixin has stabilized. This is a system engineering, you may have to swim hard to turn black, and the slurry is not easy to bubble under acidic conditions. Ordinary slurry should be yellow-brown, check the amount of dust in your dust collector, the starting point foam is normal, your slurry pH value is between 4 6, blowing bubbles in water", and after a period of operation.

This kind of "rain on the day, your main circulation pump starts to turn the slurry up, check whether your oil circuit is leaking into the slurry."