What are the causes of foaming in soda?

The bubbling of soda water is also caused by too many impurities in the water; continuous drainage should be carried out to resolve this issue

How can short-term peak heat loads cause foaming? Short-term peak heat loads generate more steam than usual, which requires the addition of large amounts of deoxygenated water. If the generated steam cannot be removed in time, a situation of steam and water boiling together occurs.

Agree with the opinion above. Simply put, during peak times, the steam generated is not sufficient to meet the demand; as a result, during the evaporation process, water vapor is carried along, leading to a situation where both gas and water bubble up together.

Peak heat load generates more steam, requiring the addition of large amounts of deoxygenated water. If the steam produced cannot be discharged in time, a situation of steam and water boiling together occurs.

There are two reasons: (1) As the boiler water evaporates, more and more impurities accumulate in it; when these impurities reach a certain level, changes in the boiler’s load can cause a phenomenon similar to rice boiling over in a pot. (2) The system pressure drops suddenly, causing the entire boiler to boil.

The so-called peak heat load refers to a sudden increase in the external steam demand, which causes a significant drop in the pressure of the steam drum. As a result, the water inside the steam drum becomes supersaturated and vaporizes rapidly, leading to a sharp rise in the liquid level. This is what is known as boiling over of the steam-water drum caused by peak heat loads.

I would like to add two points: 1. If there are abnormalities in the quality of the boiler water, it is necessary to increase the water supply while also increasing the amount of wastewater discharged. 2) Excessive changes in the boiler’s heat output, water supply volume, and steam generation rate are the cause of this issue

Agree with the view from floor 7. The water level line of the gas-liquid two-phase mixture inside the drum is the point where the pressures of the two phases are in balance. During peak periods, the steam consumption increases significantly, which causes the pressure in that space to drop greatly. As a result, the pressure in the water space becomes higher than that in that space, causing the water level to rise and creating an apparent water level.

Soda bubbles together: http://bbs.hcbbs.com/viewthread. ... B%CB%AE%B9%B2%CC%DA

Is the harm caused by foaming soda significant? What about the emergency measures?

The two main issues are: 1. The load is increased too quickly; 2. There are too many impurities

The concentration ratio is too high; it is recommended to manage wastewater discharge and chemical addition properly

During boiler operation, the boiler water and steam rise together, forming bubbles that blur the boundary between them; this leads to severe fluctuations in water level, and a large amount of water is carried along with the steam, posing a threat to the safe operation of the boiler. This phenomenon is known as a steam-water surge accident. When a foaming accident occurs, it is difficult to monitor the water level. The large amount of moisture in the steam reduces its quality; if there are superheaters, this can lead to excessive scaling and overheating in those superheaters, and in severe cases, tube bursts may occur. Reasons for steam-water foaming in boilers: (1) The quality of the boiler water does not meet the specified standards; alkalinity and salt content are significantly too high. The feed water contains large amounts of oil and suspended particles, which leads to a severe deterioration in the quality of the boiler water. (2) Improper discharge operation: continuous discharge is not activated or the opening degree is too low; regular discharge is not carried out or the interval between discharges is too long – in short, the amount of discharge is too small. (3) During paralleling, the boiler pressure is higher than that of the steam header; opening the main steam valve too quickly causes the boiler pressure to drop sharply, resulting in a flash flood of steam and water. (4) Severe overloading, or too rapid increase in load. Treatment of boiler steam-water flooding: (1) Reduce combustion, close the main steam valve, decrease the boiler’s evaporation rate, and lower the load while maintaining stability. (2) Fully open the surface blowdown valve (continuous blowdown valve) of the upper drum, and carry out regular blowdown at the lower part of the drum as appropriate. At the same time, increase the water supply volume to reduce the alkalinity and salt content of the boiler water; attention should be paid to controlling the boiler water level at this time. (3) For boilers that use in-boiler chemical treatment, the addition of chemicals should be stopped. (4) Open the drain valves on the superheater, steam pipes, and steam distributors. (5) Maintain the boiler water level slightly below the normal level. (6) Notify the water treatment personnel to take measures to ensure a supply of qualified softened water. Increase the frequency of water sampling and testing in the boiler until the water quality meets the standards, after which normal operation can be resumed. (7) It is strictly prohibited to increase the boiler load until the boiler water quality is improved. After the accident is resolved, the water level gauge should be flushed promptly.