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After that development, the original patent was no longer used. The "Benson boiler" name, however, was retained. 1957: Unit 6 at the Philo Power Plant in Philo, Ohio was the first commercial supercritical steam-electric generating unit in the world, [2] and it could operate short-term at ultra-supercritical levels. [3]
The ability to change an existing sub-critical boiler over to an OT program is very limited. "Common injection points are just after the condensate polisher and again at the deaerator outlet." [ 1 ] This forms a thicker protective layer of hematite (Fe 2 O 3 ) on top of the magnetite.
Blechynden boiler: An early naval water-tube boiler. [6] [9] Bolsover Express boiler [10] box boiler: An early marine boiler with flat sides. Owing to the flat sides, even with extensive rod stays, the boilers were only suitable for low pressures. These boilers were physically large and contained a few large flues, each heated by its own furnace.
Three-drum boiler, casing removed. Three-drum boilers are a class of water-tube boiler used to generate steam, typically to power ships. They are compact and of high evaporative power, factors that encourage this use. Other boiler designs may be more efficient, although bulkier, and so the three-drum pattern was rare as a land-based stationary ...
Although the definitions are somewhat flexible, it can be said that older steam generators were commonly termed boilers and worked at low to medium pressure (7–2,000 kPa or 1–290 psi) but, at pressures above this, it is more usual to speak of a steam generator. A boiler or steam generator is used wherever a source of steam is required.
Recovery boilers were soon licensed and produced in Scandinavia and Japan. These boilers were built by local manufacturers from drawings and with instructions of licensors. One of the early Scandinavian Tomlinson units employed an 8.0 m high furnace that had 2.8×4.1 m furnace bottom which expanded to 4.0×4.1 m at superheater entrance. [3]
Electric steam boiler on the training ship Golden Bear. An electric steam boiler is a type of boiler where the steam is generated using electricity, rather than through the combustion of a fuel source. Such boilers are used to generate steam for process purposes in many locations, for example laundries, food processing factories and hospitals ...
A typical Cochran boiler, as illustrated, [5] might be 15 feet (4.57 m) high and 7 feet (2.13 m) in diameter, giving a heating surface of 500 square feet (46.45 m 2), and a grate area of 24 square feet (2.23 m 2). Working pressure is between 100 and 125 psi (6.9 and 8.6 bar; 690 and 860 kPa).
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