Boiler water treatment is a type of industrial water treatment focused on removal or chemical modification of substances potentially damaging to the boiler. Varying types of treatment are used at different locations to avoid scale, corrosion, or foaming.Beside this, why boiler water treatment is required?
Boiler water is treated to prevent scaling, corrosion, foaming, and priming. Chemicals are put into boiler water through the chemical feed tank to keep the water within chemical range. Scale is precipitated impurities out of the water and then forms on heat transfer surfaces.
Additionally, what is the difference between feed water and boiler water? Boiler feed water is a water with very less hardness used in boiler to generate steam. Hardness should not be more than 5 ppm. We can use DM water as boiler feed water but it will increase cost of overall steam generation . Therefore we don't use DM water as boiler feed water.
Besides, what are the chemicals used in boiler water treatment?
Steam Boiler Chemicals - These include Oxygen Scavengers, Amines, Phosphates, Polymers, and Alkalinity Builders.
- Oxygen Scavengers - Most common type is 38%, pH < 4.
- Boiler Alkalinity Builders - Potassium Hydroxide or Sodium Hydroxide are the most common boiler alkaline products..
What is TDS in boiler water?
The actual dissolved solids concentration at which foaming may start will vary from boiler to boiler. Conventional shell boilers are normally operated with the TDS in the range of 2 000 ppm for very small boilers, and up to 3 500 ppm for larger boilers, provided the: Boiler is operating near to its design pressure.
What is P alkalinity in boiler water?
P alkalinity test is the test for amount of hydroxides and carbonates present in boiler water.It gets its name from the indicator phenolphthalein used in this test.It is done to examine the conditions of boiler water's alkalinity mainly due to hydroxides and the necessary action to take to brinng it within limits.Why phosphate is added in boiler?
Phosphate treatment programs precipitate calcium and magnesium hardness from boiler feedwater in the form of hydroxyapatite and serpentine. These compounds form sludge, which, when properly conditioned with polymers, is removed from the boiler via blowdown.What is hardness in boiler water?
Boiler feedwater also contains metal salts such as chlorides, magnesium, sulphur and calcium bicarbonates. All of these salts combine to form what is known as the “hardness” of water, with calcium and magnesium contributing the most to water hardness.What is foaming in boiler?
Foaming and priming in boilers. Boiler water carry-over is the contamination of the steam with boiler-water solids. Bubbles or froth actually build up on the surface of the boiler water and pass out with the steam. This is called foaming and it is caused by high concentration of any solids in the boiler water.What is the pH value of boiler water?
8.5 pH
Why sodium triphosphate is added in boiler water?
Phosphate buffers the boiler water, reducing the chance of large pH changes due to the development of high caustic concentrations. Excess caustic combines with disodium phosphate and forms trisodium phosphate. Elevated temperatures at the boiler tube wall or deposits can result in some precipitation of phosphate.Why we use DM water in boiler?
Demineralized water is required particularly for boiler feed purposes. In case where the total dissolved solids (TDS) of the raw water is very high, demineralized (DM) water is used for the cooling tower make–up water. This is because a small quantity of the circulating water is recycled in the process.What is chloride in boiler water?
It also serves as a standard of boiler water concentration together with total solids. Formation of chloride ions can be done by controlling the amount and time of boiler blow down. Standard value of chloride ion is less than 300 mg Cl/l.Why is conductivity important in boiler water?
The Effects of High Conductivity in Boiler Water Treatment. When this occurs, the boiler becomes less efficient and increases the fuel consumption of the unit. High conductivity levels also heighten the risk that the boiler water becomes contaminated, which can be very dangerous.What is silica in boiler water?
Silica, in amounts ranging from less than 1 to over 100 ppm, is found in all natural water supplies. Silica is the only boiler water salt which vaporizes at pressures below 2400 psig. It can vaporize at pressures as low as 400 psig. This has caused deposition problems in numerous turbines.Why is the pH in my boiler water high?
Oxygen dissolved in water is essential for the cathodic reaction to take place. Second common cause of corrosion in boiler systems is low pH within the boiler. This reduced pH may result from CO2 infiltration or form contamination by other chemicals.What is oxygen scavenger in boiler?
Boiler Oxygen Scavengers are used to remove dissolved oxygen from the boiler feed water and boilers. Dissolved oxygen in the boiler is very corrosive at higher temperatures and pressures. This may lead to localized pitting and premature boiler tube failure or excessive feedwater leaks.What is phosphate used for in boiler water?
Phosphate compounds are common additives for boiler water treatment. Phosphate compounds react with any remaining hard water compounds to create a soft sludge that is eliminated through blowdown. Trisodium phosphate is the most common compound for lower pressure boilers.Why hydrazine is used in boiler water treatment?
Hydrazine Injection for Boiler Water Treatment Corrosion is a major problem for steam boiler systems in power plants with high consumption of make-up water. Hydrazine efficiently eliminates the residual oxygen by reacting with the oxygen forming water and gaseous nitrogen.What should be the pH of boiler feed water?
Controlling pH Natural water is usually between 6.5 and 7.5 pH. A common recommendation is to maintain boiler water at 8.5 pH. Acidic water is corrosive. Alkalinic water is more prone to scaling.What does phosphate do in boiler water?
Phosphates. Phosphate treatment programs precipitate calcium and magnesium hardness from boiler feedwater in the form of hydroxyapatite and serpentine. These compounds form sludge, which, when properly conditioned with polymers, is removed from the boiler via blowdown.Can you drink boiler water?
The answer to this question is quite simple if water is from the main supply then yes you can drink it but if the water in your combi-boiler is fed from storage tank then it is no. So in the case of clean and hygienic storage tank, you can drink water from combi-boiler occasionally. 
