Feeding pump turbine steam source switching control method

A control method and technology for steam turbines, applied in mechanical equipment, engine components, machines/engines, etc., can solve problems such as unfavorable steam source switching smoothly, and achieve the effect of avoiding water cutoff protection action, huge economic and social benefits, and ensuring stability.

Active Publication Date: 2019-02-01
GUODIAN NANJING ELECTRIC POWER TEST RES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no special treatment for the FCB working condition in the control logic, which is not conducive to the smooth switching of high and low pressure steam sources under the FCB working condition. At this time, the water supply control is very important. How to ensure the rapid switching of the steam source and the stability of the water supply flow Changes will be the key to the realization of the FCB function of the unit

Method used

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  • Feeding pump turbine steam source switching control method
  • Feeding pump turbine steam source switching control method
  • Feeding pump turbine steam source switching control method

Examples

Experimental program
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Effect test

Embodiment

[0028] The steam source switching control method of the feed pump steam turbine in this embodiment enables the high-pressure switching valve to supply steam according to the set inlet steam pressure curve when the unit is under low load or the four-stage steam extraction system fails; in addition, when the turbine generator trips In FCB or FCB working conditions, the logic of feed pump turbine inlet steam adjustment valve and high-pressure switching valve is quickly processed. When the feed pump turbine four-exhaust steam supply is interrupted, the cold re-high pressure steam source can be quickly switched to the feed pump turbine for steam supply, and according to The boiler working condition automatically adjusts the feed water flow, maintains the stable operation of the boiler bypass system, avoids the boiler water cut-off protection action, and controls the main steam temperature within the required range to protect the safe operation of the unit equipment.

[0029] The spe...

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Abstract

The invention discloses a feeding pump turbine steam source switching control method. According to the method, when a unit runs at the low load or a four-section steam extraction system is failed, a high-pressure switching valve can supplement steam according to a steam inlet pressure curve; in addition, when a steam-turbine generator is tripped or under the FCB working condition, logics of a feeding pump turbine steam admission governor valve and a high-pressure switching valve are quickly processed; when the feeding pump turbine four-extraction steam supply is interrupted, a cold re-high-pressure steam source can be quickly switched to a pump turbine so as to supply steam; and the water feeding flow is automatically adjusted according to the working condition of a boiler, so that a boiler by-pass system is maintained to run stably, and the water supply cut-off protection action of the boiler is avoided.

Description

technical field [0001] The invention relates to a steam source switching control method for a feed pump steam turbine, and belongs to the technical field of supercritical unit debugging. Background technique [0002] The steam source switching of feed pump steam turbine is divided into two types: internal switching and external switching. The switching of steam source is realized inside the steam turbine body, which is called internal switching, and the switching realized outside the steam turbine body is called external switching. Such as figure 1 As shown, an ultra-supercritical unit with a capacity of one million units is equipped with a single feed pump steam turbine, and the steam source of the feed pump steam turbine is switched externally. When the FCB condition occurs (the main engine trips or load shedding), it will switch to the cold resteam source. A high-pressure switching valve is designed on the steam inlet pipeline of the cold resupply pump turbine, which is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D17/20
CPCF01D17/20
Inventor 杨希刚林加伍马晓峰蔡培谭锐白冬波李朝兵卢旭东竺有刚殷戈
Owner GUODIAN NANJING ELECTRIC POWER TEST RES CO LTD
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