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System and method for controlling shaft seal electric heater of shaft seal system of ultra-supercritical unit

A technology of ultra-supercritical units and electric heaters, which is applied in the direction of machines/engines, mechanical equipment, engine components, etc., can solve the problems of electric heater failure tripping, etc., to ensure safety and stability, and ensure safe, reliable and economical operation Effect

Pending Publication Date: 2022-06-03
XIAN THERMAL POWER RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the shaft seal steam supply part is equipped with a shaft seal electric heater to ensure the temperature of the steam supply, but there is a problem that the electric heater frequently fails and trips due to overheating during operation.

Method used

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  • System and method for controlling shaft seal electric heater of shaft seal system of ultra-supercritical unit

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Embodiment Construction

[0024] In order to make those skilled in the art better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only The embodiments are part of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Furthermore, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts disclosed in the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] The accompanying drawings show a schematic structural diagram of an embodimen...

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Abstract

The invention discloses a control system and method for a shaft seal electric heater of a shaft seal system of an ultra-supercritical unit. An outlet of an auxiliary steam header is communicated with an inlet of a front electric valve of the shaft seal electric heater and an inlet of a bypass electric valve of the shaft seal electric heater; an outlet of the shaft seal electric heater front electric valve passes through the shaft seal electric heater and then is combined with an outlet of the shaft seal electric heater bypass electric valve through a pipeline to be divided into two paths, and one path is communicated with a shaft seal steam main pipe through an auxiliary steam supply shaft seal bypass electric valve. The other path is communicated with the shaft seal steam main pipe through an auxiliary steam supply shaft seal electric valve and an auxiliary steam supply shaft seal adjusting valve; a first temperature measuring point T1 is arranged at an outlet of the shaft seal electric heater, a second temperature measuring point T2 is arranged at an inlet of the auxiliary steam supply shaft seal electric valve, and the system and the method can guarantee safe, reliable and economical operation of the shaft seal system.

Description

technical field [0001] The invention belongs to the technical field of steam turbine shaft seal electric heaters, and relates to a shaft seal electric heater control system and method for a shaft seal system of an ultra-supercritical unit. Background technique [0002] The shaft sealing system is an important part of the steam turbine. For the high pressure area, its function is to prevent the high temperature and high pressure steam from leaking out of the cylinder to cause heat loss; for the low pressure area, its function is to prevent the air from leaking into the vacuum part of the cylinder to ensure the high-efficiency operation of the unit. The shaft seal system has strict requirements on the temperature and pressure of the steam supply, so as to ensure that excessive thermal stress will not be generated at the shaft seal of the steam turbine, and prevent the large shaft from bending due to the entry of supercooled or superheated steam. [0003] For ultra-supercritica...

Claims

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Application Information

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IPC IPC(8): F01D25/10F01D21/00F01D11/00
CPCF01D25/10F01D21/00F01D11/00
Inventor 闫文辰张杰蔺奕存何卫斐杨光张明理伍刚王涛张泉刘鸿
Owner XIAN THERMAL POWER RES INST CO LTD
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