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A control system and control method for a lubricating oil pump of a steam turbine

A technology of lubricating oil pump and control system, applied in mechanical equipment, engine components, machine/engine, etc., can solve problems affecting system stability, oil pressure fluctuation, main engine shutdown, etc., to save power consumption of oil pump and achieve stable oil pressure , the effect of easy implementation

Active Publication Date: 2022-04-12
YANKUANG GUOHONG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the traditional oil pump control method adopts dual oil pump contactor control, and uses the oil pressure interlock value and electrical interlock to start the backup pump. After the oil pumps are switched to each other, the oil pressure will still fluctuate and the main engine will stop, seriously affecting the stability of the system operation.

Method used

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  • A control system and control method for a lubricating oil pump of a steam turbine
  • A control system and control method for a lubricating oil pump of a steam turbine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] As shown in Figures 1 and 2, this embodiment provides a steam turbine lubricating oil pump control system, including a first oil pump and a second oil pump.

[0037] The first oil pump includes a first main motor 2, a first frequency converter 1 and a first field control circuit; the first main motor 2 is electrically connected to the first frequency converter 1, and the first frequency converter 1 is electrically connected to the first field control circuit, The first on-site control circuit controls the on-site start-stop, fault stop and high-low speed operation of the first oil pump.

[0038] The second oil pump includes a second main motor 5, a second frequency converter 4 and a second field control circuit; the second main motor 5 is electrically connected to the second frequency converter 4, and the second frequency converter 4 is electrically connected to the second field control circuit, The second on-site control circuit controls on-site start-stop, fault stop ...

Embodiment 2

[0056] This embodiment provides a method for controlling a lubricating oil pump of a steam turbine, including the following steps:

[0057] The first oil pump and the second oil pump run simultaneously;

[0058] When the first oil pump stops or fails, the first oil pump sends a signal to the second oil pump, and the second oil pump increases its operating speed after receiving the signal;

[0059] When the second oil pump stops or fails, the second oil pump sends a signal to the first oil pump, and the first oil pump increases its operating speed after receiving the signal.

[0060] It should be noted that when the two oil pumps are running normally at the same time, they run at a low speed. If any oil pump stops or fails, the other can be operated at a higher speed to ensure stable oil pressure.

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Abstract

The invention provides a steam turbine lubricating oil pump control system and control method. The system includes a first oil pump and a second oil pump. The first oil pump includes a first frequency converter and a first field control circuit. The second oil pump includes a second frequency converter and a second oil pump. 2. On-site control circuit. Under normal circumstances, the first oil pump and the second oil pump run at the same time. When the first oil pump stops or fails, the first on-site control circuit sends a signal to the second inverter, and the second inverter increases the operating frequency; When the second oil pump stops or fails, the second on-site control circuit sends a signal to the first frequency converter, and the first frequency converter increases the operating frequency. The two pumps of the present invention operate at the same time. If one oil pump fails, the other pump will immediately increase the operating frequency to achieve stable oil pressure, shorten the oil pressure establishment time, completely solve the problem of high-speed steam turbine tripping due to lubricating oil pressure fluctuations, and ensure system safety. Stable and long-period operation; and the system and method are easy to implement, save the power consumption of the oil pump, and increase economic benefits.

Description

technical field [0001] The invention relates to the field of lubricating oil pumps for steam turbines, in particular to a control system and method for lubricating oil pumps for steam turbines. Background technique [0002] In chemical production, the stable operation of the steam turbine is particularly important. Some large compressors use steam turbines as prime movers. Because some steam turbines rotate at very high speeds, the fluctuation range of lubricating oil pressure is required to be very small and the recovery time is very short. At present, the traditional oil pump control method adopts dual oil pump contactor control, and uses the oil pressure interlock value and electrical interlock to start the backup pump. After the oil pumps are switched to each other, the oil pressure will still fluctuate and the main engine will stop, seriously affecting the stability of the system operation. . Contents of the invention [0003] In order to solve the above problems, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D25/20F01D21/00
CPCF01D25/20F01D21/00
Inventor 吕晓辉陈永献牟建张波国洪鹏李卫国张心卫朱敏鉴郄海明
Owner YANKUANG GUOHONG CHEM