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Shaft seal electric heater system and method preventing steam seal journal sticking of 1000MW ultra supercritical turbine

An electric heater, ultra-supercritical technology, applied in the direction of leakage prevention, machines/engines, mechanical equipment, etc., can solve problems such as low auxiliary steam temperature, rotor lock, large shaft bending, etc., to meet the requirements of shaft seal temperature, Prevent the steam seal from holding the shaft and avoid dry burning

Pending Publication Date: 2018-01-19
SHANDONG ZHONGSHI YITONG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially for new units, since the auxiliary steam temperature of the whole plant provided by the start-up furnace is often low and cannot meet the temperature requirements, often when the new unit is started or after a high-load shutdown, No. If they do not match, the rotor will lock up during cranking, and the steam seal will lock the shaft. If it is not handled properly, it will even cause a bending accident of the large shaft.
[0004] To sum up, in the prior art, there is still no effective solution to the problem of how to control the steam temperature of the steam turbine shaft seal with Siemens technology and prevent the shaft seal of the 1000MW ultra-supercritical steam turbine with Siemens technology

Method used

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  • Shaft seal electric heater system and method preventing steam seal journal sticking of 1000MW ultra supercritical turbine
  • Shaft seal electric heater system and method preventing steam seal journal sticking of 1000MW ultra supercritical turbine

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Embodiment 1

[0038] Such as figure 1As shown, the present application provides an electric heater system for preventing 1000MW ultra-supercritical steam turbine steam seal from holding the shaft, the system includes a supercritical steam turbine shaft seal system, and the ultra-supercritical steam turbine shaft seal system includes 1, the high-pressure cylinder shaft seal 4 at both ends, the medium-pressure cylinder shaft seal 5 disposed at both ends of the medium-pressure steam turbine 2, and the low-pressure cylinder shaft seal 6 disposed at both ends of the low-pressure steam turbine 3, the high-pressure cylinder shaft seal 4, the medium-pressure cylinder shaft seal 5 and the low-pressure cylinder shaft seal 6 communicate with the shaft seal steam supply main pipe 10 respectively through the shaft seal steam pipeline, and the steam supply regulating valve 7 is arranged on the pipeline connecting the shaft seal steam supply main pipe 10 and the auxiliary steam system; The critical steam ...

Embodiment 2

[0044] Such as figure 2 As shown, this embodiment provides a shaft seal electric heater system for preventing 1000MW supercritical steam turbine seal, including a supercritical steam turbine shaft seal system and a shaft seal electric heater system, and the ultra-supercritical steam turbine shaft seal system It includes a high-pressure cylinder shaft seal 4 arranged at both ends of the high-pressure steam turbine 1, an intermediate-pressure cylinder shaft seal 5 arranged at both ends of the medium-pressure steam turbine 2, and a low-pressure cylinder shaft seal 6 arranged at both ends of the low-pressure steam turbine 3. The high-pressure cylinder shaft seal 4, The medium-pressure cylinder shaft seal 5 and the low-pressure cylinder shaft seal 6 communicate with the shaft seal steam supply main pipe 10 through the shaft seal steam pipe respectively, and the shaft seal steam supply main pipe is connected to the auxiliary steam system 15 through the auxiliary steam pipe 16. A st...

Embodiment 3

[0052] This embodiment proposes a working method for preventing a 1000MW supercritical steam turbine steam seal shaft-hugging shaft seal electric heater system, including the following steps:

[0053] When the steam turbine starts and the load is low, if the shaft seal steam does not meet the temperature requirements, the electric heater system is put into operation, and the shaft seal steam electric door and the shaft seal electric heater bypass door are opened;

[0054] Open the front electric door of the shaft seal electric heater and the rear electric door of the shaft seal electric heater, and keep the drain valve normally open;

[0055] Put in the electric shaft seal heater and close the bypass door of the shaft seal electric heater;

[0056] Adjust the shaft seal steam temperature to 240°C to 300°C according to the shaft seal temperature limit curve.

[0057] The above-mentioned working method for preventing the 1000MW ultra-supercritical steam turbine steam seal shaft...

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Abstract

The invention discloses a shaft seal electric heater system and method preventing steam seal journal sticking of a 1000MW ultra supercritical turbine. The shaft seal electric heater system comprises an ultra supercritical turbine shaft seal system. The ultra supercritical turbine shaft seal system comprises a shaft seal steam supply mains. The shaft seal steam supply mains is connected to an auxiliary steam system through an auxiliary steam pipeline. A steam supply regulation valve, a shaft seal steam electrically operated valve and a check valve are mounted on the auxiliary steam pipeline. Ashaft seal electric heater system is arranged between the check valve and the steam supply regulation valve and comprises a shaft seal electric heater, a front shaft seal electric heater electricallyoperated valve, a rear shaft seal electric heater electrically operated valve, a shaft seal electric heater bypass valve, a drain valve, an in-situ temperature gauge and a thermocouple. A drain pipe is connected with the auxiliary steam pipeline. The drain valve is arranged on the drain pipe. The shaft seal steam temperature is controlled about 300 DEG C, the shaft seal temperature requirement ismet, and steam seal journal sticking of the ultra supercritical turbine of a Siemens technology is prevented.

Description

technical field [0001] The invention relates to an electric heater system and method for preventing a 1000MW ultra-supercritical steam turbine steam seal from holding a shaft seal. Background technique [0002] In the existing Siemens technology steam turbine body shaft seal system, there is only one steam source for steam supply, which comes from the auxiliary steam system of the unit. The steam turbine with Siemens technology has strict requirements on the temperature of the shaft seal steam. When the rotor temperature is lower than 200 °C, the temperature of the shaft seal steam should be between 240 °C and 300 °C. When the rotor temperature rises above 300 °C, the shaft seal steam temperature requirements Between 280°C and 320°C. [0003] Since the existing Siemens steam turbine body shaft seal system only uses one steam supply source, the temperature control means of the system itself is lacking. A 1000MW ultra-supercritical steam turbine with Siemens technology in do...

Claims

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Application Information

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IPC IPC(8): F01D11/04F01D11/06F01D25/10
Inventor 唐峰许怀志韩庆华张中正陈奇
Owner SHANDONG ZHONGSHI YITONG GRP
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