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On-line replacing set steam turbine high-pressure governing valve feedback device

A speed-regulating valve and feedback device technology, applied to mechanical equipment, engine components, machines/engines, etc., can solve problems such as short circuit of wires, difficult adjustment of valve position, inability to ensure speed-regulating valve, etc.

Pending Publication Date: 2020-11-27
HEBEI DATANG INTERNATIONAL TANGSHAN THERMAL POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing on-line replacement of the high-pressure speed-regulating valve feedback device of the steam turbine cannot ensure that the speed-regulating valve is fully closed, and the wires will be short-circuited during the replacement process, and the valve position is not easy after replacing the LVDT. The disadvantages of tuning, while the proposed online replacement of the tuning feedback device for the high-pressure speed control valve of the steam turbine

Method used

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  • On-line replacing set steam turbine high-pressure governing valve feedback device
  • On-line replacing set steam turbine high-pressure governing valve feedback device
  • On-line replacing set steam turbine high-pressure governing valve feedback device

Examples

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Embodiment

[0042] Example: A 2*300MW unit in a power plant, Shanghai Boiler Factory produces SG-1025-17.6 subcritical, natural circulation boiler, intermediate reheating, four-corner tangential combustion, positive pressure direct blowing pulverization system, and the steam turbine is Dongfang steam turbine The NC300 / 220-16.7-535 / 535 double-cylinder double-exhaust steam extraction and heating unit produced by the factory, the steam turbine is equipped with 4 high-pressure speed-regulating valves and 2 medium-pressure speed-regulating valves, all of which adopt electro-hydraulic Servo valve control, the unit adopts Beijing Hitachi 5000M DCS control system, DEH is integrated in the DCS system, integrated design.

[0043] Symptoms of failure: The operating personnel monitored the panel and found that the opening of the No. 4 high-profile door on the CRT screen was 48%, and it was in the fully closed position on the spot. The thermal engineer forced the door control command to 0, but the actu...

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Abstract

The invention discloses an on-line replacing set steam turbine high-pressure governing valve feedback device which includes a DEH command module. One side of the DEH command module is unidirectionallyand electrically connected with a servo board, and one side of the servo board is connected with a power amplifier board. One side of the power amplifier board is unidirectionally and electrically connected with a servo valve, one side of the servo valve is connected with an oil motor, the other side of the oil motor is connected with a feedback board. The feedback board is unidirectionally and electrically connected with the power amplifier board, and the feedback board is unidirectionally and electrically connected to the servo board. In the device, output signals of the feedback board is connected to the corresponding positions of the power amplifier board and the servo board by additionally arranging wires, when a power supply is wired, the power supply of an original feedback board is first removed, while each wire is disconnected, the wire is connected to an independent terminal block, the power supply is sent to a new feedback board through the terminal block, the risk of powerloss due to short circuit of wiring is avoided, by isolating an EH oil inlet valve of the high-pressure governing valve oil motor, the power of the oil motor is cut off, and it is ensured that the oil motor is in a fully closed state.

Description

technical field [0001] The invention relates to the technical field of steam turbine equipment, in particular to a feedback device for a high-pressure speed-regulating valve of a steam turbine that can be replaced and set online. Background technique [0002] The steam turbine, also known as the steam turbine engine, is a rotary steam power device. The high-temperature and high-pressure steam passes through the fixed nozzle to become an accelerated air flow and then sprays onto the blades, so that the rotor equipped with blade rows rotates and does work externally at the same time. The panel found that the No. 4 high-profile door on the CRT screen opened at 48%, and was in the fully closed position on the spot. The thermal engineer forced the control command of the door to 0, but the actual power of the unit fluctuated abnormally, and the pressure and temperature of the regulating stage swayed accordingly. The AGC was released, and the on-site inspection found that the No. 4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D17/00F01D17/10
CPCF01D17/00F01D17/105
Inventor 李维陈雨刘建伟
Owner HEBEI DATANG INTERNATIONAL TANGSHAN THERMAL POWER CO LTD
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