How can you prevent scale formation inside the boiler?

How can you prevent scale formation inside the boiler?

Prevention methods of boiler scaling which must be observed in accordance with boiler operation and maintenance direction are in the following:

1. Decrease in changing on operation parameters.
2. Proper chemical treatment (high quality feed water)
3. Control the PH of water.
4. Accuracy in boiler combustion control.

How scale formation of water can be prevented?

The calcium carbonate and magnesium hydroxide scales can be completely prevented if the appropriate quantity of hydrogen ions is supplied by the injection of acids such as hydrochloric acid or sulphuric acid, or an acid salt such as sodium bisulphate.

How can scale and sludge formation be controlled in boilers by calgon conditioning?

Calgon = sodium hexa meta phosphate The process involves the addition of calgon to boiler water. It prevents scale and sludge formation by forming highly soluble calcium hexa meta phosphate complex compound with CaSO4.

How sludge can be removed from boiler?

You can use magnetic power flushing equipment or an industrial power flushing machine to remove sludge from inside the boiler. Chemical solutions and magnetic filters can be used to prevent sludge build-up, but the only efficient way to get rid of it is by performing a power flush.

What is prevention of scale?

In concentrating the water by evaporation to a point where the concentration of sulfates and calcium in the water exceeds the solubility product of the anhydrite, the prevention of scale is achieved by injecting into each of the evaporator stages of seeds of a crystalline structure which corresponds to the crystalline …

Which method is best to prevent the formation of scale in high pressure boiler Mcq?

Explanation: Calgon is sodium hexa meta phosphate. Calgon prevents limescale build-up in washing machines all over the world to protect the heating element, pipes and drum of the machines. Explanation: Calgon is added to boiler water to prevent sludge and scale formation.

Which method is best to prevent the formation of scale in high pressure boiler?

(viii) Complex metric method involves addition of 1.5 % alkaline (pH = 8.5) solution of EDTA to feed-water. The EDTA binds to the scale-forming cations to form stable and soluble complex. As a result, the sludge and scale formation in boiler is prevented.

How calgon helps in preventing the scale formation?

Explanation: Calgon is added to boiler water to prevent sludge and scale formation. Explanation: At high temperature and pressure, calgon is converted into sodium orthophosphate which reacts with calcium salts to form calcium ortho-phosphate. 6.

How calgon method helps in preventing the scale formation?

In Calgon method, Sodium Hexa Meta Phosphate or Calgon is used in the form of tablets. Calgon reacts with the calcium ions to form a complex which is highly soluble complex. Therefore, it helps in preventing the precipitation of carbonate and bicarbonate salts that form scales. These precipitates can be easily removed.

What causes scaling in boilers?

in a boiler causes impurities to concentrate. Scaling is mainly due to the presence of calcium and magnesium salts (carbonates or sulphates), which are less soluble hot than cold, or to the presence of too high concentration of silica in relation to the alkalinity of the water in the boiler.

How is sludge formed in boilers?

Boiler sludge is a deposit that forms when suspended materials present in the boiler water settle on, or adhere to, hot boiler tubes or other surfaces. Sludge may be formed from a combination of whatever suspended materials are in the water, including loose corrosion products, insoluble mineral precipitates and oil.

How do you prevent scale insects?

The safest effective way to control scale is with a horticultural oil spray. These insecticides contain oil in a form that will mix with water. When mixed and sprayed onto an infested plant, the oil coats the scale insects and clogs their breathing pores.

What are the disadvantages of sludge in a boiler?

Scale and sludge in boilers. 4.1 Disadvantages of sludge formation: 1. Sludges are poor conductors of heat, so they tend to waste a portion of heat used. 2. If sludges are formed along with scales, the former get entrapped in the later and both get deposited as scales.

How does Calgon treatment prevent scale and sludge formation?

Calgon treatment prevents scale formation in boilers. Give reason. Addition of calgon (sodium hexa meta phosphate) to boiler feed water interacts with calcium ions in the CaSO4 forming a soluble complex, thus preventing the precipitation of scale and sludge forming salt. 2CaSO4 + Na2 [Na4 (PO3)6] Na2 [Ca2 (PO3)6] +

How are scale forming impurities removed from boiler water?

An internal treatment is accomplished by adding a proper chemical to boiler water either : (a) to precipitate the scale forming impurities in the form of sludges, which can be removed by blow-down operation, or (b) to convert them into compounds, which will stay in dissolved form in water and thus do not cause any harm.

How does caustic embrittlement prevent scale and sludge formation?

As a result, the sludge and scale formation in boiler is prevented. Moreover, this treatment : (1) prevents the deposition of iron oxides in the boiler, (2) reduces the carryover of oxides with steam, and (3) protects the boiler units from corrosion by wet steam (steam containing liquid water). Caustic embrittlement is a type of boiler corrosion]