Low capacity and low pressure boilers (typically firetube boilers) primarily rely on simple gravity separation of water and steam. Prevention of carryover can also be divided into mechanical and chemical means. Consequently, boiler water silica level must be carefully limited in higher pressure systems, especially if turbines are present.
While this is not a concern with most common minerals at pressures less than 1,000 psi, vaporous carryover of silica can occur at pressures as low as 400 psig. At high pressures, steam actually dissolves a portion of the mineral salts in boiler water. Selective vaporous carryover occurs due to the solvent properties of steam. The alkalinity in boiler water can react with these contaminants to produce a crude soap that causes foaming and carryover. Oil, grease, or other organic contaminants can also cause carryover due to foaming. In some plants, dissolved solids level is the primary factor controlling whether carryover occurs while in others it is alkalinity level.
High suspended solids, high dissolved solids, high alkalinity, and process contamination from the condensate system can all cause foaming. Chemical Causesįoaming and selective vaporous carryover are the two main mechanisms of chemical carryover. If a boiler is operated at loads in excess of its design rating or is subject to sudden increases in load, the potential for carryover dramatically increases. Operating characteristics also directly influence steam purity. Design factors affecting carryover include design pressure, steam drum size, design steam generating rate, circulation rate, and type of mechanical separating equipment used. Mechanical Causesīoiler design directly influences steam purity. Chemical causes of carryover include high solids concentration (dissolved or suspended), excessive alkalinity, grease, oil, or other contamination. Mechanical causes of carryover include boiler design, high water level, firing method, and load characteristics. The causes of carryover are generally classified as either mechanical or chemical. Since water at a given pressure has a lower heat content than steam, wet steam has a lower heat content than dry steam. Additionally, carryover can strip away the protective magnetic layer on steam lines, remove the film formed by filming amine programs, cause erosion-induced corrosion, and result in product quality problems in processes using live steam.Īn often overlooked consequence of boiler water carryover is efficiency loss due to wet steam. If deposits are significant, heat transfer and/or turbine efficiency may be reduced. Explore and see how LG is making life good.Boiler water carryover can cause deposits to form in valves, heat exchangers, turbines, and superheaters. Browse LG washer dryer combinations and all of our innovative home appliances and washing machines, including TurboWash™, Steam Washing Machines, and 6 Motion Direct Drive washing machines. Get the latest in cutting-edge technology with the dependability you have to come to expect. With innovations like SenseClean, sanitary cycle and LoDecibel motors, LG washer dryer combos are designed with your valuable space in mind. Using half the water, energy and space of a traditional side-by-side washer and dryer set, LG washer dryer combos are the ultimate time- and space-saving laundry solution. Get the space-saving solution you need with the performance you expect. Sophisticated LG design: LG’s washer dryer combinations feature a sleek and sophisticated design meant to enhance any home décor. Cutting-edge interface: LG washer dryer combinations feature LED display indicators and Dial-A-Cycle controls to help ensure the correct setting with every load. Direct drive motor: Offers fewer moving parts for decreased troubleshooting and less that can go wrong, all while backed with a 5-year warranty. Sanitary cycle: Heats water up to 158 degrees for the ultimate sanitising solution while removing stains and bacteria. LG’s selection of washer dryer combos are loaded with state-of-the-art technology, including: SenseClean system: Automatically sets the water level and wash time for each load based upon the weight of your clothes.
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