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Control method and device for preventing water rush during operation of feedwater pump system and feedwater pump system

A control method and control device technology, applied in pump control, liquid variable displacement machinery, machine/engine, etc., can solve problems such as resistance mismatch

Active Publication Date: 2019-11-08
CHINA SHENHUA ENERGY CO LTD +2
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The object of the present invention is to provide a control method and device for preventing water grabbing during the operation of the feedwater pump system, and a feedwater pump system. The water rush problem when the water pumps are running in parallel realizes the stable control of the water supply flow

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  • Control method and device for preventing water rush during operation of feedwater pump system and feedwater pump system
  • Control method and device for preventing water rush during operation of feedwater pump system and feedwater pump system
  • Control method and device for preventing water rush during operation of feedwater pump system and feedwater pump system

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Embodiment Construction

[0029] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0030] Figure 4 It is a control method for preventing water grabbing during operation of a feedwater pump system provided by an embodiment of the present invention. Such as Figure 4As shown, the control method may include the following three steps: S401, respectively obtain the feed water flow rates that each of the plurality of automatic feed water pumps needs to provide through the flow distribution circuit; S402, according to the obtained The feed water flow rate to be provided is respectively obtained through the main adjustment circuit to obtain the required rotation speeds of the plurality of automatic feed water pumps; The regulating circuit respecti...

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Abstract

The invention relates to the fields of thermal control and automation, and discloses a control method and device of water robbing prevention in operation of a feed water pump system and the feed waterpump system. The control method comprises the following steps that feedwater flow needing to be provided by multiple automatic feed water pumps is separately obtained through a flow distribution loop; rotating speeds needing to be provided by the multiple automatic feed water pumps are separately obtained through a main loop according to the obtained feedwater flow needing to be provided by the multiple automatic feed water pumps; and the multiple automatic feed water pumps are separately controlled to feed water through a subsidiary loop according to the obtained rotating speeds needing to be provided by the multiple automatic feed water pumps. The problem of water robbing during simultaneous operating of the multiple automatic feed water pumps is solved, and stable control over the feedwater flow is realized.

Description

technical field [0001] The invention relates to the field of thermal control and automation, in particular to a control method and device for preventing water grabbing during the operation of a feed water pump system and a feed water pump system. Background technique [0002] For domestic 600MW and above supercritical air-cooled units, the water supply system usually uses three electric speed-adjustable feedwater pumps with a capacity of 35%, such as figure 1 shown. Due to system design reasons, the resistance along the way does not match. When two feedwater pumps are running side by side under medium and low load conditions (the third pump is withdrawn and cold standby), two feedwater pumps often rush to water, resulting in a large feedwater flow fluctuation. Especially when No. 1 and No. 2 or No. 2 and No. 3 feed water pumps run in parallel (the paths to the outlet feed water pipes are different), the stability of the feed water flow cannot be guaranteed, resulting in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04B49/20
CPCF04B49/007F04B49/20
Inventor 吴志刚张秋生刘磊王富强
Owner CHINA SHENHUA ENERGY CO LTD
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