IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0204578
(1998-12-03)
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발명자
/ 주소 |
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인용정보 |
피인용 횟수 :
28 인용 특허 :
3 |
초록
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A once-through steam generator or boiler of simple modular construction that utilizes vertical heat transfer tubes, intended primarily for heat recovery in combined cycles. It utilizes a novel method of assembly and operation that make it particularly effective for large combined cycles. Circuit ass
A once-through steam generator or boiler of simple modular construction that utilizes vertical heat transfer tubes, intended primarily for heat recovery in combined cycles. It utilizes a novel method of assembly and operation that make it particularly effective for large combined cycles. Circuit assemblies with a once-through flow path are the key building blocks used to assemble boilers to fit any size gas turbine. They are individually bench fabricated in a horizontal plane. The boiler is manufactured by sequentially stacking individual circuit assemblies in parallel thereby building a circuit module. During the stacking process the inlet and outlet of each circuit assembly are connected to headers to allow the modules to be erected into a heat transfer bundle. For large boilers several transportable circuit modules are interconnected in the field to complete a once-through boiler. Through the use of jumper tubes and a novel maintenance space integrated in the boiler, interconnection of modules in the field is simplified at installation and repair made easy. A novel method of dewatering and drying vertical tube boilers is incorporated. The dewatering method uses stored energy to reverse the flow of water and steam in the boiler thus forcing water out of the tubes. This operating method is important in preventing corrosion of carbon steel tubes, thereby permitting the practical application of carbon steel tubes to vertical tube once-through steam generators.
대표청구항
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[ I claim:] [1.] A once-through boiler comprising:(a) A plurality of circuit assemblies, each said circuit assembly comprising: a plurality of vertical heat transfer tubes, a plurality of crossover tubes, and a plurality of U-bend tubes, welded together into at least one independent once-through ste
[ I claim:] [1.] A once-through boiler comprising:(a) A plurality of circuit assemblies, each said circuit assembly comprising: a plurality of vertical heat transfer tubes, a plurality of crossover tubes, and a plurality of U-bend tubes, welded together into at least one independent once-through steam generating serpentine flow path, means for installing said heat transfer tubes horizontally into individual said circuit assemblies in the shop, means for supporting said circuit assembly by hanging, means for transferring the weight of said circuit assembly to the ground, means for spacing said heat transfer tubes for thermal effectiveness, means for sealing said circuit assembly to prevent blowby leakage, means for accommodating thermal expansion of said circuit assembly, means for damping tube vibration, means for dewatering said circuit assemblies, means for repairing said circuit assembly, means for transporting said circuit assemblies horizontally to the field, means for connecting said circuit assemblies in series in the field and thereby providing said boiler with individual preheater, vaporizer and superheater in each once-through flow path, means for interspersing different independent steam pressure flow paths to provide high thermal performance to the boiler with multiple pressure, whereby said boilers with long horizontal gas flow paths, and with a plurality of different steam generating flow paths, can be constructed from said circuit assemblies having widths narrow enough to be transported,(b) a plurality of circuit sub-modules comprising: a plurality of said circuit assemblies stacked in parallel with a plurality of connection weld joints to at least one high pressure feedwater header, and at least one high pressure steam header,(c) a boiler casing comprising: a gas inlet duct, a gastight shell structure around said circuit sub-modules, a boiler exhaust stack, an insulation system, a plurality of blowby seals, whereby hot gas flow is sealed and directed to flow across said circuit assemblies, and whereby said circuit assemblies are supported and blowby loss is minimized,(d) means for effecting the flow of water into said feedwater headers of said circuit assemblies, whereby water as it flows through said circuit assemblies is heated, evaporated to steam by hot gases flowing horizontally across said heat transfer tubes that are vertically positioned in the gas flow path that is directed by said boiler casing from a gas turbine heat source,(e) means for distributing water flow uniformly to the feedwater inlet end of said circuit assemblies to stabilize flow and provide uniform outlet steam temperature from each independent flow path in said circuit assembly, said means for distributing water comprising a flow resistor at the feedwater inlet end of each flow path in said circuit assembly,whereby any size of the boiler can be constructed from said circuit assemblies with most of the welds completed in the shop and a plurality of different pressures can be provided to the boiler and,whereby said circuit asssemblies with long tubes can be transported to the field horizontally for erection into a vertical operating position.
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