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A Feedwater Control Method to Suppress Main Steam Pressure Rise in FCB Process

A control method and technology of main steam pressure, applied in the direction of controlling water supply, steam generation, lighting and heating equipment, etc., can solve the problems of large equipment renovation costs and equipment installation costs, equipment ordering and equipment commissioning cycle, difficult implementation of active units, etc. , to avoid mutual interference problems, reduce the range of rapid rise, and improve the success rate

Active Publication Date: 2018-12-21
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Disadvantage 1: It is necessary to redesign the relevant thermal system, replace the turbine bypass control system or increase the PCV valve, which is difficult to implement in the active unit
[0005] Disadvantage 2: Need to increase the cost of huge equipment transformation and equipment installation
[0006] Disadvantage 3: The cycle of system design, equipment ordering, equipment installation and equipment debugging is long, and it is difficult to implement in active units

Method used

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  • A Feedwater Control Method to Suppress Main Steam Pressure Rise in FCB Process
  • A Feedwater Control Method to Suppress Main Steam Pressure Rise in FCB Process
  • A Feedwater Control Method to Suppress Main Steam Pressure Rise in FCB Process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1: Taking a 660MW supercritical unit as an example, after the central control unit detects the action of the FCB, the first feedwater pump quickly reduces the output and the second feedwater pump controls the total feedwater flow.

[0045] Step S101: the central control unit detects the FCB action signal sent by the FCB action signal sending module;

[0046] Step S102: After the central control unit detects the action of the FCB, switch the steam source driven by the steam-driven feedwater pump, and immediately interlock and open the electric door and the regulating door of the steam pipeline from the cold section of the unit reheating steam to the small steam turbine, and the regulating door is quickly opened to a certain opening degree (e.g. 60%) and put into automatic operation; at the same time, close the steam extraction check door and electric door of the fourth stage of the steam turbine to the small steam turbine and deaerator to prevent the steam in t...

Embodiment 2

[0050] Embodiment 2: Taking a 660MW supercritical unit as an example, after the central control unit detects the action of the FCB, two feedwater pumps are paralleled to control the total feedwater flow at the same time.

[0051] It includes steps:

[0052] Step S201: the central control unit detects the FCB action signal sent by the FCB action signal sending module;

[0053] Step S202: After the central control unit detects the action of the FCB, switch the steam source driven by the steam-driven feedwater pump, and immediately interlock and open the electric door and the regulating door of the steam pipeline from the cold section of the unit reheating steam to the small steam turbine, and the regulating door is quickly opened to a certain opening degree (e.g. 60%) and put into automatic operation; at the same time, close the steam extraction check door and electric door of the fourth stage of the steam turbine to the small steam turbine and deaerator to prevent the steam in ...

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Abstract

The invention provides a feed water control method for restraining main steam pressure increasing in the FCB process. After a central control unit detects the FCB action, a small steam turbine drive steam source switching control module controls a steam feed pump drive steam source to be switched so that the steam feed pump drive steam source can be switched to steam from a boiler reheater cold segment from original steam turbine four-level pumped steam; after a first time interval is up, the central control unit sends a second pulse signal to a steam feed pump recycling adjusting door module, a first feed pump minimum flow valve is opened to a preset opening degree in an overriding manner and is switched into a manual control manner; and after a second time interval is up, the central control unit sends a third pulse signal to a steam feed pump rotating speed adjusting module, and the preset feed pump target output force is reduced in an overriding manner according to a preset rate. The stability of running of a water supply system is improved; and by means of quick reducing of the feed pump output force, the quick increasing of main steam pressure after the FCB action is effectively restrained, and a good basis is laid for FCB function achieving of a unit.

Description

technical field [0001] The invention relates to the field of automatic control of thermal power units, in particular to a feedwater control method for suppressing the main steam pressure rise in the FCB process. Background technique [0002] In order to save the one-time investment of thermal power unit equipment for thermal power generating units, most thermal power units in China currently do not have FCB functions designed, which include steam pipelines, deaerator capacity, steam turbine high / low pressure bypass, boiler power discharge valve (referred to as "PCV" valve) and other thermal systems and thermal equipment are conventionally configured. The capacity of the power grid is increasing, and the capacity of a single unit is increasing. The capacity and quantity of units with black start and FCB functions are seriously insufficient. In order to improve the safe operation of the power grid, a group of units are urgently needed to realize the FCB function. [0003] In ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F22D5/00
CPCF22D5/00
Inventor 黄卫剑潘凤萍邓少祥湛志刚李锋叶向前
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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