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A zero-output control and protection method for low-pressure cylinders of a double-low-pressure cylinder steam turbine

A control method and low-pressure cylinder technology, applied to mechanical equipment, engine components, machines/engines, etc., to achieve the effect of ensuring normal and smooth operation

Active Publication Date: 2021-12-21
DONGFANG TURBINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Previously, domestically, there has been a 300MW single-low-pressure cylinder steam turbine low-pressure cylinder zero-efficiency retrofit performance. For 600MW and above double-low-pressure cylinder steam turbine units, it is urgent to propose a four-split double low-pressure cylinder (low-pressure cylinder A and low-pressure cylinder B). Low-pressure cylinder zero output Operational control and protection schemes to solve the conflicting current situation of increasing heating demand and structural constraints for steam turbine units

Method used

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  • A zero-output control and protection method for low-pressure cylinders of a double-low-pressure cylinder steam turbine

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Embodiment 1

[0046] In this embodiment, a control method for zero output of the low-pressure cylinder of a double-low-pressure cylinder steam turbine is provided, including a high-pressure cylinder, a medium-pressure cylinder, A low-pressure cylinder, B low-pressure cylinder and a DEH control system arranged in a double-low-pressure cylinder steam turbine. The low-pressure cylinder steam turbine belongs to the existing equipment. In this method, only its partial steam circuit is modified to achieve the purpose of enabling low-pressure cylinder A and low-pressure cylinder B to be put into / out of the low-pressure cylinder's zero-effort operation separately or simultaneously. Those skilled in the art The internal structure of the double low-pressure cylinder steam turbine should be known, as well as the assembly relationship among the high-pressure cylinder, medium-pressure cylinder, A low-pressure cylinder, B low-pressure cylinder and DEH control system.

[0047] This control method includes:...

Embodiment 2

[0087] In order to further improve the stable operation of the double-low-pressure cylinder steam turbine, on the basis of Embodiment 1, a protection method for zero output of the low-pressure cylinder of the double-low-pressure cylinder steam turbine is disclosed. method, which includes:

[0088] (1) Monitor the pressure P1 of the exhaust port of the medium-pressure cylinder (detected by the medium-pressure sensor p1), if the pressure P1 is greater than the predetermined value, the feedback signal will be sent to the DEH control system, and the DEH control system will adjust A butterfly valve 5 and The opening degree of B butterfly valve 6; the specific steps are as follows:

[0089] (1.1) The exhaust port pressure P1 of the medium pressure cylinder is at the first level of warning

[0090] 1) If the heating and extraction pipeline is used for heating and extracting steam under the zero output operation of double low-pressure cylinders, and the water spray cooling system 10 ...

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Abstract

The invention discloses a zero-output control and protection method for a low-pressure cylinder of a double-low-pressure cylinder steam turbine, which belongs to the technical field of thermal power steam turbine power generation. Butterfly valve A and butterfly valve B cut off all the intake steam of low-pressure cylinder A and low-pressure cylinder B respectively, and set up separate cooling steam bypasses for low-pressure cylinder A and low-pressure cylinder B to introduce a small amount of cooling steam to take away low-pressure cylinder A The blast heat generated during zero-output operation or low-pressure cylinder B zero-output operation, the DEH control system adjusts the opening of different valves through control, so as to realize the low-pressure cylinder A and low-pressure cylinder B respectively or simultaneously input / exit low-pressure cylinder zero output run.

Description

technical field [0001] The invention belongs to the technical field of thermal power steam turbine power generation, and specifically relates to a method for controlling and protecting zero output of a low-pressure cylinder of a double-low-pressure cylinder steam turbine. Background technique [0002] With the continuous improvement of residents' living standards, the demand for central heating continues to increase. Thermal power heating units, as an important source of heat supply, have higher and higher requirements for their heat supply. The zero-efficiency operation technology of low-pressure cylinders is mainly for Meet the development needs of the heating market, maximize the heating capacity of the units, and change the current operating mode of most units to "fix power by heat" to realize the peak-shaving capacity of the units, especially during heating operation, to accommodate more More renewable energy generation. [0003] The low-pressure cylinder zero-output o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D17/14
CPCF01D17/145
Inventor 赵卫军黄坤谭云童万均邱超全陈容江张志勇朱博刘壹华
Owner DONGFANG TURBINE CO LTD