Turbine last-stage blade protection device for high back pressure heat supply

A protection device, the technology of the last stage blade, which is used in mechanical equipment, engine components, machines/engines, etc., can solve the problems of large distance between the last stage blades and the inability to effectively protect the last stage blades, so as to reduce turbulent flow and harmful volume, The effect of smooth and safe low-pressure flow passage

Active Publication Date: 2019-02-15
DONGFANG TURBINE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After derating, the distance between the water spray diversion ring and the last stage blade is too large, see details figure 1 , cannot effectively protect the final blade

Method used

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  • Turbine last-stage blade protection device for high back pressure heat supply
  • Turbine last-stage blade protection device for high back pressure heat supply
  • Turbine last-stage blade protection device for high back pressure heat supply

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the technology of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0024] figure 1 It is a partial view of a steam turbine without protective devices. It can be seen that after the inner cover 9 of the cylinder block 8 is removed from the last stage of the low-pressure section, the steam ejected from the remaining final stage will enter an open irregular space. In turn, severe turbulence will be generated, which will damage the equipment.

[0025] figure 2 Among them, the last-stage blade protection device of the steam turbine, which uses high back pressure for heating, can replace the removed partition and install it in the low-pressure cylin...

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Abstract

The invention discloses a turbine last-stage blade protection device for high back pressure heat supply. The protection device is of a double-layer annular structure, and can be integrally mounted ina low-pressure cylinder with a separation plate demounted, so that a low-pressure through-flow steam passage is smooth. A cooling device is further arranged in the protection device to reduce the toohigh steam discharge temperature of a turbine. By mounting the protection device in the low-pressure cylinder, the demounted last-stage separation plate can be replaced, so that the low-pressure through flow steam passage becomes smooth, and turbulent flow and harmful volume of steam flow are reduced. Meanwhile, a water spray head is arranged to carry out real-time cooling treatment on the overheated steam, the safety of a last-stage blade in remaining blades is effectively protected, and the last-stage blade is prevented from bearing unstable steam flow impacts and damage caused by too high temperature.

Description

technical field [0001] The invention belongs to the technical field of steam turbines, in particular to a protection device for the last-stage blades of steam turbines used for high back pressure heat supply. Background technique [0002] High back pressure circulating water heating is a way of using low-grade energy for heating in steam turbines. Usually, the measures of reducing the level are taken, that is, subtracting the last level or two levels in the low-pressure section, increasing the exhaust pressure, and realizing heating through the condenser. After derating, the distance between the water spray guide ring and the final stage blade is too large, see details figure 1 , cannot effectively protect the final blade. Especially in the case of low load, superheated steam will appear in the exhaust steam of the steam turbine, and the temperature will rise sharply, which will endanger the safety of the final blade among the remaining blades. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D25/12F01D9/02
CPCF01D9/02F01D25/12
Inventor 曾娅黄果郭勇王振锋徐晓康孙伟米斌朱博罗勇马骕骋李永强李锐陈玥赵正华江玲赵东庭
Owner DONGFANG TURBINE CO LTD
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