【Weekly Topic】20150720 What are the purposes and methods of boiler blowdown? (Participation rewards available)

Remove insoluble impurities from the boiler to improve steam quality. For our analyses, we generally check the levels of sodium and silicon. Currently, boiler blowdown is divided into periodic blowdown and continuous blowdown

The purpose of draining waste is to protect the boiler, reduce scaling, and improve steam quality. Waste discharge method: 1. Continuous discharge – the boiler water containing salts and silicon is discharged from the air tank to prevent contamination of the steam; it also helps to remove some suspended solids. 2. Regular sewage discharge to remove the sedimented impurities from the lowest part of the boiler water circulation system.

Boiler blowdown is divided into continuous blowdown and periodic blowdown. The purpose of continuous blowdown is to remove the salts dissolved in the boiler water, in order to maintain a certain level of salt content and alkalinity in it. The purpose of regular slag discharge is to remove insoluble sludge from the boiler water; therefore, it is discharged from the water wall lower header where the most sediment accumulates, or from the bottom of the boiler drum.

Purpose of boiler blowdown: To remove the salts accumulated in the boiler and prevent as well as reduce scaling in the boiler. The feed water that enters the drum always contains a certain amount of salts. After chemical treatment is carried out in the boiler, the scaling substances in the boiler water are converted into sludge. In addition, the corrosion of metals by the boiler water also produces some corrosion products. Therefore, the boiler water contains various soluble and insoluble impurities. During boiler operation, only a small portion of these impurities are carried away by the steam, while the majority remain in the boiler water. As the water in the boiler continues to evaporate, the concentration of these impurities gradually increases. An excessive concentration of impurities in the boiler water not only affects the quality of the steam but also can cause scaling and corrosion on the heat-exchanging surfaces, thereby impacting the safe operation of the boiler. To control the quality of the boiler water, it is necessary to carry out boiler blowdown to remove some of the water contaminated by salts and sludge, and to replenish it with clean feedwater. Boiler blowdown is divided into two types: continuous blowdown and periodic blowdown. The purpose of continuous blowdown is to remove the salts dissolved in the boiler water, in order to maintain a certain level of salt content and alkalinity in it. This type of blowdown is continuously discharged from the boiling surface where the salt concentration in the boiler water is highest; it is also known as surface blowdown. The purpose of regular slag discharge is to remove insoluble sludge from the boiler water, and therefore it is discharged from the water wall lower header where the most sediment accumulates. The discharge time is intermittent; the interval between discharges and the amount of waste discharged shall be determined by chemists based on the requirements regarding the quality of steam and water

1. Purpose: The feedwater that enters the steam drum always contains a certain amount of salts. After chemical treatment is carried out in the boiler, the scaling substances in the boiler water are converted into sludge. In addition, corrosion of metals by the boiler water also generates some corrosion products. Therefore, the boiler water contains various soluble and insoluble impurities. During boiler operation, only a small portion of these impurities are carried away by the steam, while the majority remain in the boiler water. As the water in the boiler continues to evaporate, the concentration of these impurities gradually increases. An excessive concentration of impurities in the boiler water not only affects the quality of the steam but also can cause scaling and corrosion on the heat-exchanging surfaces, thereby impacting the safe operation of the boiler. To control the quality of the boiler water, it is necessary to carry out boiler blowdown to remove some of the water contaminated by salts and sludge, and to replenish it with clean water. 2. There are three forms: continuous discharge, periodic discharge, and irregular discharge

The purpose of draining waste is to protect the boiler, reduce scaling, and improve steam quality. Waste discharge methods are divided into continuous discharge and periodic discharge: 1. Continuous discharge involves releasing the boiler water containing salts and silicon from the air tank, in order to prevent contamination of the steam; it also helps to remove some suspended particles. 2. Regular sewage discharge to remove the sedimented impurities from the lowest part of the boiler water circulation system.

This post was last edited by dongjiang1001 on 2015-7-20 07:27. 1. What is the purpose of boiler blowdown? The feed water that enters the drum always contains a certain amount of salts. After chemical treatment is carried out in the boiler, the scaling substances in the boiler water are converted into sludge. In addition, the corrosion of metals by the boiler water also produces some corrosion products. Therefore, the boiler water contains various soluble and insoluble impurities. During boiler operation, only a small portion of these impurities are carried away by the steam, while the majority remain in the boiler water. As the water in the boiler continues to evaporate, the concentration of these impurities gradually increases. An excessive concentration of impurities in the boiler water not only affects the quality of the steam but also can cause scaling and corrosion on the heat-exchanging surfaces, thereby impacting the safe operation of the boiler. To control the quality of the boiler water, it is necessary to carry out boiler blowdown to remove some of the water contaminated by salts and sludge, and to replenish it with clean feedwater. Boiler blowdown is divided into continuous blowdown and periodic blowdown. The purpose of continuous blowdown is to remove the salts dissolved in the boiler water, in order to maintain a certain level of salt content and alkalinity in it. This type of blowdown is continuously discharged from the boiling surface where the salt concentration in the boiler water is highest; it is also known as surface blowdown. The purpose of regular slag discharge is to remove insoluble sludge from the boiler water, and therefore it is discharged from the water wall lower header where the most sediment accumulates. The discharge time is intermittent, and the interval between discharges as well as the amount of discharge shall be determined by chemists based on the requirements regarding the quality of steam and water. 2. What are the main methods of waste discharge? There are three forms: continuous discharge, periodic discharge, and irregular discharge

Objective: To reduce scaling and corrosion on the heated surfaces and improve steam quality. Methods: Continuous discharge, periodic discharge, irregular discharge

1. Remove ions prone to scaling such as calcium and magnesium. 2. There are three types: continuous discharge, periodic discharge, and irregular discharge

Purpose: To remove salt and water residue from the boiler water in order to improve steam quality. Methods: Continuous discharge, periodic discharge, emergency discharge