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Penultimate-stage moving blade for feed pump turbines

A feed pump steam turbine, secondary and final stage technology, applied in the direction of machine/engine, blade supporting elements, mechanical equipment, etc., can solve the problems of long, high power, limited design of the final and secondary moving blades, and reduce the The effect of equipment investment, capital construction and operation and maintenance costs, broad market application prospects, high economy and reliability

Active Publication Date: 2015-07-15
DONGFANG TURBINE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The feed water pump turbine is a special steam turbine, and its particularity is as follows: it is often operated at high speed, variable speed, and variable power to adapt to the load change of the large machine. The steam pressure is low and the temperature is low, but the power is large. The final and next-to-last stage moving blades are very long, and these operating conditions greatly limit the design of the last and next-to-last stage moving blades

Method used

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  • Penultimate-stage moving blade for feed pump turbines
  • Penultimate-stage moving blade for feed pump turbines
  • Penultimate-stage moving blade for feed pump turbines

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Embodiment Construction

[0021] see figure 1 The invention adopts suitable alloy steel blades and rotor materials, and the moving blade manufactured according to the design drawing of this patent is composed of three parts, which are respectively: shroud body 1, blade body 2, and blade root 3. The shroud body 1 is located on the top of the airfoil 2, and the above-mentioned airfoil 2, blade root 3, and shroud 1 are integrally manufactured with the same high-strength alloy steel. The blades are installed in the impeller groove on the outer circle of the rotating shaft through the blade root 3, and 82 blades are installed in each round of the groove. level work level. The blade root 3 is a four-teeth linear axially inserted vertical tree type blade root.

[0022] For the 100% capacity feedwater pump turbine of an ultra-supercritical 1000MW class steam turbine, each large unit only needs one 100% capacity feedwater pump turbine, and one 100% capacity feedwater pump turbine has only one stage of the las...

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Abstract

The invention relates to a penultimate-stage moving blade for feed pump turbines. The effective height of the blade is 358mm, and the relative value of the blade height H is monotonically increased from 0.0 to 1.0; correspondingly, the installation angle c1 is monotonically decreased from 84.260 to 25.130; the change law of the area A from the root section to the top section is: 3.606 greater than or equal to A greater than or equal to 1.0, the change law of the axial width Xa from the root section to the top section is: 2.581 greater than or equal to Xa greater than or equal to 1.0, the change law of the chord length b1 from the root section to the top section is: 1.133 greater than or equal to b1 greater than or equal to 1.0, and the change law of the maximum thickness W1 from the root section to the top section is: 2.964 greater than or equal to W1 greater than or equal to 1.0. The penultimate-stage moving blade is applicable to 100-percent capacity feed pump turbines among 24MW to 44MW power, unidirectional-exhaust (one exhaust port), 2600rpm to 5500rpm variable rotational speed and ultra-supercritical 1000MW class turbines.

Description

technical field [0001] The invention relates to the last-stage moving blade of a feedwater pump steam turbine, which is suitable for 100% capacity of ultra-supercritical 1000MW steam turbines with variable speed of 2600-5500rpm in power 24MW-44MW, one-way steam exhaust (one exhaust port), and speed of 2600-5500rpm. Feed water pump turbine. Background technique [0002] The feed water pump turbine is a special steam turbine, and its particularity is as follows: it is often operated at high speed, variable speed, and variable power to adapt to the load change of the large machine. The steam pressure is low and the temperature is low, but the power is large. The last and next-to-last stage moving blades are very long, and these operating conditions greatly limit the design of the last and next-to-last stage moving blades. Moreover, the economy and safety of the feedwater pump turbine are closely related to the thermal, aerodynamic, strength, and vibration design of the last an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D5/14F01D5/30
Inventor 李伯武肖向浩肖晓玲谭成成文谋黄雪芬贾丹师春燕曾洪勇蒋世希
Owner DONGFANG TURBINE CO LTD
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