Is it necessary to install a chemical dosing system in the boiler?

What boiler? Why doesn’t our company have such a device?

It is specified in the Code for Design of Boiler Rooms.

This post was last edited by goldliyang on 2017-7-13 at 16:40. It is recommended to use a chemical dosing device for boiler feed water. I. Characteristics of water treatment in boilers: Water treatment in boilers involves adding a certain amount of softening agents to the boiler water, which converts the scaling substances present in the feed water into sludge. This sludge is then removed from the boiler through blowdown, thereby slowing down or preventing the formation of scale. This water treatment is primarily carried out inside the boiler, which is why it is called internal boiler water treatment. Water treatment inside boilers has the following characteristics: 1. Water treatment in boilers does not require complex equipment, thus resulting in low investment and costs, as well as easy operation. 2. The chemical dosing method inside the boiler is the most basic water treatment method, and it represents a continuation and complement to chemical water treatment outside the boiler. Even after external water treatment, residual hardness may remain; to prevent scaling and corrosion in the boiler, certain water treatment chemicals are still added. 3. Water treatment inside the boiler still cannot completely prevent scale formation in the boiler; especially the sludge that forms can easily lead to secondary scale accumulation if waste water is not removed in a timely manner. 4. The chemical dosing method used in boilers causes no pollution to the environment. Unlike water treatment methods such as ion exchange, which remove certain impurities from natural water but still discharge those same impurities after regeneration, this method does not result in the release of large amounts of residual regenerants or products resulting from regeneration. The chemical treatment method used in boilers converts the main impurities in water into insoluble sludge, thus causing no pollution naturally. 5. The formula used in the chemical dosing method inside the boiler must be compatible with the quality of the feedwater; when the hardness of the feedwater is too high, a large amount of sludge will be formed, accelerating the scaling of the heat transfer surfaces. Therefore, it is generally not suitable for water with high hardness

Generally, low-pressure boilers (equal to or less than 1.0 MPa) do not require chemical dosing, while medium- and high-pressure boilers (greater than 1.0 MPa) do need it. There are mainly two reasons: 1. When the steam pressure is high, the temperature is also high, resulting in a small temperature difference with the fire; due to scaling in the boiler, the heat transfer efficiency is reduced ； 2. High-pressure boilers can explode when there is excessive scaling, whereas low-pressure boilers do not explode.