the effect of presence of scale and sludge in efficiency of steam boiler

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What are boiler troubles? - Quora

Mar 12, 20180183;32;1 Boiler feed water 1 .Definition: The setup used to produce steam in industries is known as 'Boiler'. Water is fed to the boiler and heated to produce steam. The water fed into the boiler is known as "Boiler feed water". 2. Requirements for boile

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Boiler Water Treatment Chlorine Dioxide ClO2 - Pureline

Scale and sludge deposits can form on boiler heat transfer surfaces, resulting in efficiency loss and possible failure due to overheating. The most common types of deposits, those formed by calcium salts, are due to the presence of excessive hardness in the boiler feedwater.

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Introduction to Boiler Scales - Trusted Partners in Steam

Boiler Scales. As all of us are aware, in a boiler, steam formation takes place because of heat transfer from fire side to water side. So, performance of any boiler not solely but mainly depends on the efficiency of the heat transfer. Metals are good conductors of heat. Hence, all the contact surfaces between fire side and steam side are metals

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Section 3 - Module 10: Internal Water Treatment for

The chief effects of scale are: 1. Scale restricts heat transfer 2. Scale causes severe turbulence 3. Scale Traps water beneath it and encourages corrosion 4. Scale sloughs off and casues flow restriction 5. Scale traps water beneath it and encourages erosion a. 1,2,3,4 b. 1,2,3 c. 1,3,4 d. 1,2,5

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What is a Sludge? - Definition from Corrosionpedia

Sludge reduces heat efficiency and may cause scale formation in boilers and heat exchangers. 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.

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Chapter 12 Boiler Deposits: Occurence And Control SUEZ

Sludge is the accumulation of solids that precipitate in the bulk boiler water or enter the boiler as suspended solids. Sludge deposits can be hard, dense, and tenacious. When exposed to high heat levels (e.g., when a boiler is drained hot), sludge deposits are often baked in place.

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How Boiler Feedwater Quality Can Affect Boiler Operations

Mar 24, 20150183;32;Boiler feedwater that is out of specification can cause corrosion (which may lead to boiler failures) and scale (which may lead to significantly reduced efficiency or boiler failures). If low quality feedwater is used, there is the potential to cause boiler system problems that are costly to correct.

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THE BASICS OF BOILER WATER CHEMISTRY -

• Some oxygen enters a boiler system, even with effective mechanical pretreatment • Oxygen scavengers are use to tie up oxygen to prevent oxygen attack • The #1 cause of boiler tube failure is Oxygen Corrosion • Preventing Oxygen Corrosion • Chemical control Oxygen scavengers • Sulfite reacts with oxygen to form harmless salt

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Boiler water testing equipment and procedures explained

Boiler water testing is an integral part of the routine boiler tests carried out on board a ship. Precise boiler water test assures higher efficiency and reduced maintenance of boilers. Careful monitoring of boiler water is of utmost importance in order to maintain correct water conditions.

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Introduction to Boiler Scales - Trusted Partners in Steam

Boiler Scales. As all of us are aware, in a boiler, steam formation takes place because of heat transfer from fire side to water side. So, performance of any boiler not solely but mainly depends on the efficiency of the heat transfer. Metals are good conductors of heat. Hence, all the contact surfaces between fire side and steam side are metals

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Soot & Scale Affects Boiler Performance Goodway

Oct 11, 20160183;32;Scale builds up over a longer period of time and also contributes to boiler inefficiency. Heat loss of 8% and increased fuel consumption of 2% will result from only 132" (0.8mm)of scale in the boiler tubes. In a watertube boiler, water runs through tubes that are surrounded by the heating source.

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Boiler Scale Inhibitors ChemTreat, Inc.

The formation of scale and sludge can cause tube failures, restrict circulation, reduce system efficiency, and compromise your boiler system's reliability. Boiler scale is a deposit that forms directly on heat transfer surfaces when constituent solubility limits are exceeded and the resulting compounds precipitate onto the tube surfaces.

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How Scale Impacts Boiler Performance Goodway

How Scale Impacts Boiler Performance HVAC Scale Affects Boiler Performance Remove Scale From Boilers for Better Performance Maintaining a scheduled cleaning program for boilers is essential to reduce costs and increase equipment life. dirty boiler tubes - whether the firetube or watertube type - cause more fuel to be used and drive up heating

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How the scale and sludge is formed in boiler - answers.com

Hard Scale(Scale) - Forms in steam boiler -Has the appearance of a white and brown concentration -smooth texture Soft Scale(Sludge) -Forms in the hot water heaters -Appears as a thick,brown or

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How the sludge and scale formed in boilers - answers.com

Hard Scale(Scale) - Forms in steam boiler -Has the appearance of a white and brown concentration -smooth texture Soft Scale(Sludge) -Forms in the hot water heaters -Appears as a thick,brown or

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Boiler feed water - Lenntech

Boiler feed water. As steam is produced, dissolved solids become concentrated and form deposits inside the boiler. This leads to poor heat transfer and reduces the efficiency of the boiler. Dissolved gasses such as oxygen and carbon dioxide will react with the metals in the boiler system and lead to boiler corrosion.

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Experimental Study of Chemical De-scaling-I: Effect of

efficient de-scaling. The scale from an industrial boiler is treated with four different acid solutions at five different strengths to study their dissolving effect on the scaledeposits in the tubes of the boilers. Results reveal that 5% solution of HCl is the most effective to dissolve the scale in a specified time at room temperature.

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Improving Boiler Life and Reducing Cast Iron Boiler Accidents

Improving Boiler Life and Reducing Cast Iron Boiler Accidents Introduction. The original version of this article appeared in a 1975 issue of The Locomotive. But a key fact remains true today: overheating due to low water condition is still the major cause of boiler failures.

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Care and Maintenance of Steam Systems - FMLink

Steam systems are most affected by scale, foaming and carryover, and corrosion. Sludge buildup and caustic embrittlement can also reduce boiler efficiency. Scale in Boilers. Scale in boilers inhibits efficient heat transfer. Scale buildup of 18 inch can reduce heat transfer by 15 percent. Take a look at how scale increases your energy costs:

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Improving Boiler Life and Reducing Cast Iron Boiler Accidents

Cracks from overheating can prevent proper operation of a boiler. Excessive make-up using hard water (high mineral content) is a typical factor in scale and sludge build-up. Softening the water will reduce the mineral content, but can lead to corrosion. Test raw water to determine if water treatment is required.

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