Unlock instant, AI-driven research and patent intelligence for your innovation.

Water supply pump system

A technology for water supply and test water, applied in the direction of pump, pump control, pump device, etc., can solve the problems of high numerical value, excessive design, large water tank capacity, etc., to achieve the effect of high reliability and simple structure

Inactive Publication Date: 2009-07-22
MITSUBISHI HEAVY IND LTD
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] However, according to the above-mentioned conventional calculation method, the effective NPSH (NPSHav.) design of the water supply pump system is too large
Specifically, the installation height of the water tank is too high, and the capacity of the water tank is too large, resulting in design waste
Or, when the system configuration conditions are first determined, unnecessary machine design or overly complicated control design is adopted, which leads to a decrease in reliability due to increased cost or unstable control
[0021] This is because the required value of NPSH (NPSHreq.) is determined based on normal temperature, saturated air, and industrial water containing impurities, and it is different from the necessary value obtained by using condensate in the state of high temperature, degassing, and pure water in the actual machine. The value becomes too high compared to

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Water supply pump system
  • Water supply pump system
  • Water supply pump system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] First, a basic consideration method for deriving the required NPSH under actual machine operating conditions will be described as Embodiment 1. In the present embodiment, the required NPSH, which is the test result of ordinary room-temperature industrial water, is corrected by the following formula, thereby deriving the required NPSH under the actual machine operating conditions with high accuracy.

[0050] NPSHreq.A=NPSHreq.+f(T)+g(x)+h

[0051] in:

[0052] NPSHreq.A: The required NPSH value when the actual machine is running

[0053] NPSHreq.: The required NPSH value based on the test results of normal temperature industrial water

[0054] f(T): Correction term for the influence of test water temperature

[0055] g(x): Correction term for the influence of dissolved oxygen

[0056] h: Correction term for the influence of particulate impurities

[0057] figure 1 is the derived line graph of f(T). In the figure, the horizontal axis represents the temperature T of...

Embodiment 2

[0061] Next, a more specific method for deriving the required NPSH under actual machine operating conditions will be described as a second embodiment. As factors affecting NPSH, one is generation of occlusion between pump blades. This is because between the rotating blades of the water supply booster pump, the drop in static pressure due to the increase in flow velocity will generate gas, thereby blocking the passage between the blades (cavitation, cavitation), increasing the water supply. The head of the pressure pump is reduced. This is the requirement mechanism of NPSH generally considered by people in the past.

[0062] As the types of gas generated, there are gas generated by dissolved oxygen and vapor generated by boiling under reduced pressure. The gas generated from dissolved oxygen is obtained by decompressing the dissolved oxygen (8 ppm) in a saturated state at normal temperature into a gaseous phase, thereby closing the blades. In addition, the steam generated by...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

In order to provide a simple structure, NPSH based on the requirements of the actual machine operating conditions derived with high precision, and realize a simple, low-cost, and highly reliable water supply pump system, the test water based on normal temperature, saturated air, and containing impurities The first requirement NPSH is corrected to derive the second requirement NPSH based on high temperature, degassing, and condensed water in a pure water state as actual machine operating conditions, and the design is performed based on the second requirement NPSH.

Description

technical field [0001] The present invention relates to a water supply pump system used in atomic power plants or thermal power plants. Background technique [0002] Conventionally, for example, in atomic power plants or thermal power plants, condensate water supply systems have been employed. Fig. 6 is a schematic diagram showing an example of a condensate water supply system in a conventional power generation facility, exemplifying a case of a nuclear power generation facility. In the figure, steam generated in steam generator 1 is driven by heat generated from an atomic furnace not shown in the figure, and high-pressure steam turbine 2 and low-pressure steam turbine 3 are driven, whereby generator 4 generates electricity. Also, when generating electricity by thermal power, a boiler is used instead of an atomic furnace. [0003] The steam generated by these steam turbines is heat-exchanged with seawater not shown in the figure by the water condenser 5 , condensed into co...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): F04D13/00F04D15/00
CPCF04D15/0088
Inventor 真锅纯宫川和芳
Owner MITSUBISHI HEAVY IND LTD