Method for producing and assembling superheater coil tubes of steam generators
A steam generator, coiled tube technology, applied in the field of superheater coiled tubes used in the manufacture and assembly of steam generators, to achieve the effect of eliminating influence and flawless precipitation hardening
Active Publication Date: 2010-03-24
GENERAL ELECTRIC TECH GMBH
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Materials currently used do not meet these requirements
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[0020] figure 1 By way of example, a superheater serpentine or superheater heating surface 1 is shown schematically produced and arranged and assembled inside a tube wall 6 of a steam generator (not shown), including the connection tube 4 passing through the tube wall 6 . For the sake of clarity, it is pointed out that inside the pipe wall 6 there are a plurality of figure 1 Superheater coils 1 shown in . The superheater coil 1 is produced in the workshop from a plurality of straight pipes 2 and bent parts 3 and is welded to the connection pipe 4 passing through the pipe wall 6 at the installation position, ie on the assembly side. The connecting pipe 4 itself is connected outside the pipe wall 6 to distribution and collection devices not shown, with which the working medium circulating in the steam generator—usually water, steam or a mixture of water and steam—can be fed to the superheated Coiled pipe 1 or derived from the superheater coiled pipe. The method for producing ...
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The present invention relates to a method for manufacturing superheater coil tubes and connecting tube thereof as well as assembling to the tube wall of the steam generator, wherein the coil tube is respectively formed by a straight tube and a bended component at least. The connecting tube is respectively provided with a sleeve equipped to the outside of the connecting tube at least. The method comprises the following steps: providing straight, bend precursor and connecting tubes of deposition-hardened nickel-based alloy in solution-annealed form, and sheaths of material not to be heat-treated, in a workshop; forming the bends and connecting tubes in a workshop, using bending tools; forming the individual coils by joining the straight tubes and bends, and joining the sheaths with the connecting tubes in the region where the pipes pass through the tube wall, using weld seams formed in a workshop; deposition-hardening the coils and sheathed connecting tubes in a first heater in a workshop; producing the coils through connecting the straight tubes with the bends by weld seams and connecting the sleeve with the connecting tubes through the weld seams; deposition hardening these seams between the straight tubes and bended components and between the sleeve and the connecting tubes by a second heater in the workshop; connecting the coils and the connecting tubes through weld seams andconnecting the sleeve and an accommodating component through the weld seams; and deposition hardening these weld seams with the second heater at the mounting site.
Description
technical field [0001] The invention relates to a method for manufacturing and assembling superheater coils of a steam generator. Background technique [0002] Superheater coils are primarily used in steam generators in power stations heated with fossil fuels. Here, the superheater serpentine tube is arranged as a heating surface in a flue surrounded by tube walls, which is located downstream of the combustion chamber formed by the burner, as seen in the flow direction of the combustion exhaust gas, wherein the flue and the combustion chamber The cross-section of the chamber is generally rectangular. The individual tubes of the superheater coils, which are formed from welded straight tubes and bends and optionally further welded parts, conduct the working medium heated by the combustion of fossil fuels or superheated in the superheater coils and Continue to pass it on to other processes. In known welded superheater coils, steels containing 9-12% chromium and subsequent he...
Claims
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IPC IPC(8): B23P15/26
CPCB23P15/26F28D7/08F28F21/087B21D53/06C22F1/10F28D7/085C21D6/02F22G7/12F28F9/26B21D53/08B23K2203/08B23K35/3033B23K2201/14B23K2103/26B23K2101/14
Inventor R·哈特维希A·黑尔姆里希D·穆特A·沙尔克
Owner GENERAL ELECTRIC TECH GMBH