JPS62101803A - Steam turbine for quick start - Google Patents

Abstract

PURPOSE:To keep a turbine rotor at a high temperature and shorten the starting time in the DSS (Daily Start & Stop) operation, even when a steam turbine is at rest, by supplying pyrogenetic lubricating oil to a turbine rotor bearing and introducing the pyrogenetic steam into a shaft sealing part. CONSTITUTION:A steam introducing hole 11, which is connected to a connecting hole 13 that is provided in a labyrinth seal 14, is made in a dummy seal 2, and moreover the steam introducing hole 11 is connected to a steam pipe 12 which is led to a high temperature steam supplying equipment. On the other hand, the drain oil from a bearing 7 supporting a rotor 1 is sucked from a suction pipe 21 by means of an oil pump 22 and is supplied to an oil filler port 25 of the bearing 7 via a heater 23. With this contrivance, when the turbine is at rest, the pyrogenetic steam is blown into a casing from the dummy seal 2, while the lubricating oil, which is heated by the heater 23 having a circulating heating-medium, is supplied to the bearing 7. Accordingly, the turbine rotor 1 can be kept at a high temperature even when it is at rest, and at the same time the starting time in the DSS operation can be shortened.

Description

[Detailed description of the invention] [Industrial application field] DSS (Daily 5tart & 5top
) Concerning improvements to operational steam turbines.

tC) and a schematic diagram showing the bearing section. A rotor 01 is provided with a pressure seal 02 between it and an inner vehicle compartment 03 for dividing the pressure compartments within the vehicle compartment.

Further, there are gland seals 05 and 06 between the outer car chamber 04 and the rotor 01 is supported by a bearing 07.

[Problem that the invention seeks to solve]

D S S (Daily 5tart & 5top
) When a steam turbine in operation is in a standstill state,
Low 201 Rapid start is required during the next operation →r←÷
→.

When high-temperature steam is introduced, excessive thermal stress is generated in rotor 01, so rapid startup is not actually possible. , I have no choice but to accelerate slowly.

This warm-up time until turbine startup is a major problem in DSS operation.

[Failure to solve the problem]

As a means of heating the rotor of a steam turbine operated by DSS when it is not in operation, a system that supplies high-temperature lubricating oil to the bearings is connected, and the turbine rotor is heated by ejecting high-temperature steam from the gland seal or dummy seal to warm the rotor. A flow path for guiding high-temperature steam was provided in the shaft seal part of the shaft to guide high-temperature steam.

[Effect]

High-temperature lubricating oil is supplied to the bearings that support the rotor, and high-temperature steam is also introduced to the shaft seal, so the rotor is always maintained at a high temperature even when the steam turbine is at rest.

〔Example〕

FIG. 1 is a sectional view showing an embodiment of a dummy seal portion according to the present invention. For dummy seal 2.

A steam introduction hole 11 is bored that connects to a communication hole 13 provided in the labyrinth seal 14.
It communicates with Although not shown here, a similar configuration may be adopted for the gland seal.

FIG. 2 is a conceptual diagram of an embodiment in which heat is supplied to the rotor 1 from the bearing 7.
The oil pump 22 sucks in the oil, and the waste oil is supplied to the oil supply hole 25 of the bearing 7 from the oil supply pipe 24 via the heater 23. Therefore, when the steam turbine is not operating, high-temperature steam is blown into the cabin from the dummy seal and gland seal of the turbine (not shown), and the bearing 7 is heated by a heater 23 in which a heat medium 26 circulates as shown by the arrow. lubricating oil is supplied.

〔Effect of the invention〕

By supplying heat to the casing penetration part (seal part) and the bearing part of the turbine rotor that is at rest, it is possible to reduce the heat dissipation cooling of the turbine rotor.

Therefore, the present invention greatly contributes to the development of industry, such as being able to maintain the rotor at a high temperature while it is at rest, and shortening the start-up time in DSS operation.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram of a steam supply system to a seal section showing an embodiment of the present invention, and FIG. 2 is a conceptual diagram of a high temperature oil supply system to a bearing showing an embodiment of the present invention. Figure 3 shows the axial suction pipe of a conventional turbine, 22... oil pump, 23...
・Heater, 24... Oil supply pipe, 25... Oil supply hole, 26.
・Heating medium. 1st circle M2 circle

Claims (1)

[Claims] A lubrication system consisting of an oil pump and a heater for supplying high-temperature lubricating oil to the bearings that pivotally support the turbine rotor is connected, and a passage for guiding high-temperature steam is provided in the shaft seal of the turbine rotor. A quick-start steam turbine characterized by a high-temperature steam pipe connected to the flow path.