Sludges and scales
WebbFormation of deposits: Scale and sludge formation. Scale:If the precipitate forms hard and adherent coating on the inner walls of the boiler is known as scale. It is formed by the substances like CaSO4, Mg (OH)2 and Ca (HCO3)2. Scales are difficult to remove even with the help of hammer and chisel. Scales are the main sources of boiler troubles. Webba) Sludges are soft, loose and slimy precipitate b) They are non-adherent deposits and can be easily removed c) Formed generally at heated portions of the boiler d) Can be removed by blow down operation View Answer Check this: Engineering Chemistry I MCQ Engineering Chemistry II Books 6.
Sludges and scales
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Webb19 maj 2024 · Most movement just stops. In the case of boiler sludge and scale, that movement is heat. It's trying to get from the fire, through the metal, and then onto the … WebbSBRs were operated in a 12–20 h SBR cycle depending on the origin of the tested inoculum or deammonifying sludge. SBRs with the sludges of MWWTP 01–02 and 05–06 originated from a single-stage deammonification reactor and were therefore operated for 8 h of aerobic phase and 12 h of anoxic phase, in which the NH 4-N start concentration of 150 …
Webb20 nov. 2024 · Differences between sludge and scale:- No Sludge Scale 1 Loose, slim , non-adherent Hard, thick , strong adherent precipitate precipitate 2 Due to salts like MgSO4 , MgCl2 Due to salts like CaSO4 , Ca (HCO3)2 3 Due to poor conductance, they Due to poor conductance, they decrease the boiler efficiency to decrease the boiler efficiency to … WebbDifferentiate between Sludge & Scale Sludge Scale 1 Due to heating, the salt containing water will get concentrated and changes into loose and slimy precipitates called sludge. …
WebbObserving all of the above losses which are resulted out of boiler scale formation, it is very important to avoid the scale formation. On financial fronts, scales and deposits can aggravate following costs/ losses-1. Higher maintenance costs. 2. High repair costs in case of tube failures. 3. Down times which can affect the production line badly. 4. Webboccur necessarily in the full-scale plant (4). For very high suspended solids concentrations [greater than 6,000 mg/l for plants E and A2 (Figure 2)] the sludge still may not agglomerate; but since the maximum possible SVI n-1-1 INITIAL SUSPENDED SOLIDS CONCENTRA TION = 2000 mg// J 10 20 TIME, min FIGURE 1.?These two sludges, with
WebbScales, sludges, inorganic deposits, and foulants Corrosion takes many forms but is always an electrochemical process, whereas deposition and fouling are often combinations of …
Webb24 nov. 2024 · In case of the piston press with a mechanical drive, the machine develops a compressive force of around 200 MPa and is typically used for large-scale production, ranging 200 kilograms per hour (kg/h) to 2,500 kg/h. The achieved briquette densities are normally in the range between 1,000 kg/cum to 1,200 kg/cum. grahamsville ny zip codeWebb5 okt. 2024 · Problems caused by Hard Water: Hard water can cause costly breakdowns in boilers, cooling towers and plumbing. When hard water is heated, the hardness causing salts tend to precipitate out of solution, forming a hard scale or soft sludges in pipes and surfaces, thereby completely plugging pipes and restricting flows. china industrial hydraulic jacksWebbLow specific activity scales consisting of alkaline earth metal carbonates and sulfates are often present in some gaseous and liquid hydrocarbon plants; these scales contain a certain concentration of radium, uranium and thorium, which can cause a risk of γ-irradiation and of internal radiocontamination when they must be mechanically removed. grahamsville new york weatherWebbScales, sludges, inorganic deposits, and foulants Corrosion takes many forms but is always an electrochemical process, whereas deposition and fouling are often combinations of both chemical and physical processes, involving inorganic and organic contaminants, the effective controlof which tends to be much more of an art than a science. [Pg.104] china industrial handheld vacuumsWebbSludges are formed by substances like MgCl2, MgCO3, MgSO4 and CaCl2. They have greater solubilities in hot water than cold water. Scale 1) If the precipitate forms hard and adherent coating on the inner walls of the boiler, it is called scale. china industrial coating equipment factoryWebbSludges are poor conductors of heat, so they tend to waste a portion of heat generated. Excessive sludge formation disturbs the working of the boiler. Sludge can be removed by … china industrial international trustWebbOption-1 : scales : Option-2 : sludges: Option-3 : both of these. Option-4 : hot water only: Question 37 : soluibility of calcuim sulphate in water. Option-1 : increases with rise in temperature. Option-2 : decreases with rise of tempreture. Option-3 : remains unaltered with rise of temperature. grahams vehicle repairs aberystwyth