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Rotor for low pressure turbine
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A low-pressure turbine and high-pressure turbine technology, used in mechanical equipment, non-variable-capacity engines, engine components, etc., can solve the problems of excess impurity content, increase in manufacturing days, delay in delivery, etc. The effect of boundary segregation and no manufacturing cost
Inactive Publication Date: 2010-07-07
MITSUBISHI HITACHIPOWER SYST LTD
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Problems solved by technology
However, since the rotor for the low-pressure turbine is particularly large, the technology disclosed in Patent Document 1 has the following problems: in the case of manufacturing an integrated rotor for the low-pressure turbine, the cost increases, the number of days of manufacture increases, and the delivery The reliability of the quality of manufactured steam turbine rotors due to the delay of the deadline and the high possibility of impurity content exceeding the reference value due to deviation, etc.
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Embodiment 1
[0034] figure 1 It is a figure which shows the structure of the steam turbine power generation facility of Example 1.
[0035] refer to figure 1 , a power generation facility constituted by a steam turbine facility using the low-pressure turbine rotor of the present invention will be described. also, figure 1 This is an example of the first-stage reheating, and the present invention is also applicable to the implementation of the second-stage reheating and only the reheating temperature is increased (630° C. or higher), and is not particularly limited.
[0036] figure 1 The illustrated steam turbine power plant 10 is mainly composed of a high pressure turbine 14 , an intermediate pressure turbine 12 , a low pressure turbine 16 , a generator 18 , a condenser 20 , and a boiler 24 . Steam according to boiler 24, main steam pipe 26, high pressure turbine 14, low temperature reheat pipe 28, boiler 24, high temperature reheat pipe 30, medium pressure turbine 12, overhead pipe 32...
Embodiment 2
[0066] (constitute)
[0067] In Example 2, the rotor 16B for low pressure turbines of another form will be described.
[0068] In Example 2, as image 3 As shown, the low-pressure turbine rotor 16B is composed of a single member (hereinafter referred to as a low-impurity 3.5Ni steel portion) 16d composed of a low-impurity 3.5Ni steel having a small impurity content, a normal 3.5Ni steel portion 16b, 16c.
[0069] That is, Example 2 is an alternative to figure 2 The low-impurity 3.5Ni steel portion 16d is adopted as the chromium steel portion 16a of the low-pressure turbine rotor of the embodiment of the illustrated embodiment. Hereinafter, since it is the same as that of Example 1 except for the low-impurity 3.5Ni steel portion 16d, the description thereof will be omitted.
[0070] In addition, the low-impurity 3.5Ni steel portion 16d is arranged at a position exposed to steam at 380°C or higher, and the 3.5Ni steel portions 16b and 16c are generally arranged at a positio...
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Abstract
Provided is a rotor for a low-pressure turbine wherein the mechanical strength characteristics can be maintained even if the temperature of steam introduced into the low-pressure turbine becomes high, and no quality problem is posed without an increase in the manufacturing costs or days. The rotor for a low-pressure turbine which is used in a steam turbine facility equipped with a high-pressure turbine, an intermediate-pressure turbine and a low-pressure turbine is constituted such that a member formed of 1CrMoV steel, 2.25CrMoV steel or 10CrMoV steel and arranged on the steam inlet side and a member formed of 3.5Ni steel and arranged on the steam outlet side are joined by welding. Alternatively, a member formed of 3.5Ni steel and arranged on the steam inlet side and a member formed of 3.5Ni steel and arranged on the steam outlet side are joined by welding, wherein the member arranged on the steam inlet side is formed of low-impurity 3.5Ni steel containing Si:0.1% or less by wt%, Mn: 0.1% or less by wt%, and inevitable impurities of P:0.02% or less, S: 0.02% or less, Sn: 0.02% or less, As: 0.02% or less, Sb:0.02% or less, Al:0.02% or less, and Cu:0.1% or less by wt%.
Description
technical field [0001] The present invention relates to a rotor for a low-pressure turbine used in a steam turbine facility including a high-pressure turbine, an intermediate-pressure turbine, and a low-pressure turbine, and particularly relates to a suitable rotor for use in a steam turbine facility with a steam inlet temperature of 380° C. or higher. Rotors for low pressure turbines. Background technique [0002] Currently, nuclear power, thermal power, and hydraulic power are used as the main power generation methods. From the viewpoint of resource amount and energy density, it is expected that the above three power generation methods will be used as the main power generation methods in the future. Among them, thermal power generation has high utility value as a power generation method that is safe and has a high ability to cope with load fluctuations, and it is expected that it will continue to play an important role in the field of power generation in the future. [00...
Claims
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Application Information
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