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EC: Lesson 11. Scale and sludge formation in boilers
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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. 3. Excessive sludge formation disturbs the working
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Applied Chemistry Lecture#7 1 Scale And Chemistry Involved In the Formation of Scale and its Prevention Scale: A chemical process of deposition of rough rags of insoluble impurities followed by hardness and increased adhesion on surface of boiler by direct transfer of heat is called scale formation and deposits/rags formed are called scales. Chemistry of Scale Formation: Boiler …
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difference between scale and sludge formation in boilers – CFBC Boile…
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Jun 18, 2015 · Boilers 1. 1 SCALE & SLUDGE FORMATION PRIMING AND FOAMING BOILER CORROSION CAUSTIC EMBRITTLEMENT BOILER PROBLEMS 2. Causes High steam velocity, +nce of large quantities of dissolved salts, Very high water level in boiler, Sudden boiling and improper design of boiler Prevention: by using soft water, fitting mechanical steam purifiers, controlling …
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6 Chapter 1 •Fouling: often used to describe scale deposits created by living organisms •Microbiological Fouling: scale deposits created by living organisms •Sediment (sludge): loosed deposits on pipelines and vessels •Gypsum: all types of scale deposits in the oil industry •Stone: deposits in the brewing and dairy industries •Incrustation: scale in marine (sea water) boilers
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Boiler scale is caused by impurities being precipitated out of the water directly on heat transfer surfaces or by suspended matter in water settling out on the metal and becoming hard and adherent. Common feed water contaminants that can form boiler deposits include calcium, magnesium, iron, aluminum, and silica.
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scale and sludge in steam boiler; scale and sludge in steam boiler. WNS series gas-fired (oil-fired) steam boiler. Product thermal capacity:1-20 t/h. Working pressure: 0.7-2 Mpa. Read More. DZL series coal-fired steam boiler. Scale and sludge formation in boilers
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Dec 31, 2009 · Scale formation in boiler due to the presence of various salts, which comes out of solution and deposited because of the effects of temperature and density. The salts of calcium and magnesium are the major sources of scale formation. Typical constituents of scale and deposits in boiler are: Calcium Carbonate : CaCO3. Calcium Sulphate : CaSO4.
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A. Sludge formation B. Corrosion C. Scale formation D. Priming and foaming Ans. D Que10. The hard and strong coating formed inside the boiler tube by chemical reaction is called as _. A. Sludge B. Scale C. Carry over D. Hard water Ans. B Que11. Normally sludge formation is towards the __ parts of the boiler tube. A.
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Scale formation and sludge formation in boilers, Chemistry. Scale formation and sludge formation in boilers, Q. Explain scale formation and . Boilers are used for steam generation. When hard water is evaporated, progressively the concentration of dissolved salt is increased. When their saturation points are reached, the dissolved salts of
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Due to the scale formation we have to heat the boiler to high temperatures this causes the weakening of boiler material. Distortion of boiler tubes makes boiler unsafe to bear pressure of the steam (especially in high pressure boiler) Decease in efficiency. Due to scale deposits the chocking of boiler is observed.
Get priceScale and sludge formation in boilers. In boilers, water evaporates continuously and the concentration of the dissolved salts increases progressively. When their concentrations reach saturation point, they are thrown out of water in the form of precipitates on the inner walls of the boiler. If the precipitation takes place in the form of loose and slimy precipitate, it is called …
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If the pH of the boiler water is higher than 11.5 and at the same time the boiler water is transparent, this fundamentally indicates the absence of sludge formation processes in the boiler. At the same time, if the pH of the boiler water is from 8.5 to 9.5 and the water is transparent in most cases this indicates an active scale formation in
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scale. The most common components of boiler deposits are calcium phosphate, calcium carbonate (in low-pressure boilers), magnesium hydroxide, magnesium silicate, various forms of iron oxide, silica adsorbed on the previously mentioned precipitates, and alumina (see Table 39.1). If phosphate salts are used to treat the
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May 02, 2000 · This is a brief discussion on low-pressure steam boiler chemistry. It provides dry Their removal dramatically reduces the possibility of boiler scale formation. Water softening can be performed by ion exchange, whereby favorable
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A boiler feeding with hard water leads 4 types of problems-1. Sludge and Scale formation2. Caustic Embrittlement3. Boiler Corrosion4. Priming and FoamingIn t
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Excess of impurities, if present, in boiler feed water generally cause some boiler-problems like Scale and sludge formation, corrosion, priming and foaming, caustic embrittlement. I. Sludge and Scale Formation in Boilers: In a boiler, water is continuously evaporated to form steam. This increases the concentration of dissolved salts.
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If hard water obtained from natural sources is fed directly into the boilers, the following troubles may arise, (i) Scale and sludge formation (ii) Priming and foaming (carry over) (iii) Caustic embrittlement (iv) Boiler corrosion. 6. What are scales and sludges? Sludge: If the precipitate is loose and slimy it is called sludge. Sludges are
Get priceScale formation and sludge formation in boilers, Chemistry. The sludge are generally form by the substance, which have greater solubility in hot water than cold water. So, sludge is formed in colder parts of boiler. Theories of scale formation 1. View More; Boiler Scales - …
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12/17/2021 6 Disadvantages of scale formation 1. Fuel wastage – scales have low thermal conductivity 2. Degradation of boiler material and increases the risk of accident 3. Reduces the efficiency of the boiler and- deposit on the valves and condensers 4. The boiler may explode – if crack occurs in scale Removal of scale 1. Using scrapper, wire brush often 2.
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Boiler sludge is a Scale prevention experiments in the real small boiler tell us exposed sample results in 3659% less scale formation than an unexposed one. Get a Quote On the other hand if the inner walls of the boiler is not made up of scale and sludge formation in boilers wikipedia – Oil and Gas BoilerJan 20, 2017 – Marine Boilers
Get priceNov 26, 2019 · How do you prevent scale and sludge formation? (i) Colloidal conditioning : In low-pressure boilers, scale formation can be avoided by adding organic substances like kerosene, tannin, agar-agar (a gel), etc., which get coated over the forming precipitates, thereby yielding non-sticky and loose deposits, which can easily be removed by pre-determined blow-down …
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Scale and sludge formation in boilers 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). 11.5 CAUSTIC
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Alkalinity Feed-Rate Requirements - [ASME Consensus table 1: Suggested water chemistry limits. Industrial watertube, high duty, primary fuel fired, drum typeMakeup water percentage: Up to of feedwater. Conditions: Includes superheater, turbine drives or process restriction on steam purity] - [ASME Consensus table 2: Suggested chemistry limits.
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Scale and sludge formation in boilers · Sludges are poor conductor of heat, so they tend to waste a portion of heat generated. · If. Scale formation and sludge formation in boilers, ChemistryThe sludge are generally form by the substance, which have greater solubility in hot water than cold water. So, sludge is formed in colder parts of boiler.
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Boiler scale is caused by impurities being precipitated out of the water directly on heat transfer surfaces or by suspended matter in water settling out on the metal and becoming hard and adherent. Common feed water contaminants that can form boiler deposits include calcium, magnesium, iron, aluminum, and silica.
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Alkalinity Feed-Rate Requirements - [ASME Consensus table 1: Suggested water chemistry limits. Industrial watertube, high duty, primary fuel fired, drum typeMakeup water percentage: Up to of feedwater. Conditions: Includes superheater, turbine drives or process restriction on steam purity] - [ASME Consensus table 2: Suggested chemistry limits.
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Dec 31, 2009 · Scale formation in boiler due to the presence of various salts, which comes out of solution and deposited because of the effects of temperature and density. The salts of calcium and magnesium are the major sources of scale formation. Typical constituents of scale and deposits in boiler are: Calcium Carbonate : CaCO3. Calcium Sulphate : CaSO4.
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Excess of impurities, if present, in boiler feed water generally cause some boiler-problems like Scale and sludge formation, corrosion, priming and foaming, caustic embrittlement. I. Sludge and Scale Formation in Boilers: In a boiler, water is continuously evaporated to form steam. This increases the concentration of dissolved salts.
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Chemistry Assignment Help, different between scale and sludge formation in boiler?, What is the difference between scale and sludge formationgive difference between them more then 6 …
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scale formation and deposits Common impurities in water may lead to scale formation or sludge deposits in boilers and cooling towers. Scale and sludge deposits in boilers and cooling towers impede heat transfer, which leads to higher energy costs and can cause a loss of equipment operation and premature failure.
Get priceBoiler Scale. 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. Such deposits may contain sodium, calcium, magnesium, phosphate, iron, and silica. The disadvantages of scale formation
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MCQ (Multiple Choice Questions with answers about Engineering Chemistry Quiz. The quantity of calgon to be added to prevent scale and sludge formation is _____ Options. A : 10-20 ppm. B : 30-50 ppm. C : 0.005-0.1 ppm. D : 0.5-5 ppm. View Answer. Iron oxide and copper depositions can be prevented by adding _____ to the boiler water. Options. A
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Scale formation and sludge formation in boilers, Chemistry. Boiler feedwater is an essential part of boiler operations. The feed water is put into the steam Boiler water is treated to prevent scaling, corrosion, foaming, and priming. there is a low amount of sludge content it is better to use dispersants because it disperses the sludge
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Scale formation and sludge formation in boilers, ChemistryThe sludge are generally form by the substance, which have greater solubility in hot water than cold water. So, sludge is formed in colder parts of boiler. Theories. Scale & sludge formation - IsquareITScales are hard sticky deposits on the inner walls of boiler.
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6 Chapter 1 •Fouling: often used to describe scale deposits created by living organisms •Microbiological Fouling: scale deposits created by living organisms •Sediment (sludge): loosed deposits on pipelines and vessels •Gypsum: all types of scale deposits in the oil industry •Stone: deposits in the brewing and dairy industries •Incrustation: scale in marine (sea water) boilers
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Nov 24, 2020 · #scale #sludge #scaleandsludge #scaleandsludgeformationinwater #boilertrouble #engineeringchemistry #waterchemistry #chemistryLink of my Water Chemistry Play
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SCALE AND SLUDGE. FORMATION IN BOILERS Concentration Concentrations Water of the reach Precipitates on evaporates dissolved salts saturation the inner walls increase point. If precipitation are loose and slimy – sludge. If precipitation are hard, adhering crust/coating on the inner walls of boiler - scal SLUDGE • Soft,loose and slimy precipitate • It can easily be scrapped …
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