Method and device for determining feasibility of setting filters at inlet pipes of water pumps in nuclear power plants
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A determination method and filter technology, applied in the field of data processing, to achieve the effect of convenient and easy determination and avoiding cavitation
Active Publication Date: 2018-06-15
GUANGDONG NUCLEAR POWER JOINT VENTURE +4
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[0008] In order to solve the problem in the prior art that there is no solution for determining the feasibility of installing a filter on the pump inlet pipe, the embodime
Method used
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Embodiment 1
[0067] refer to figure 1 , shows a flow chart of the steps of a method for determining the feasibility of installing a filter in the inlet pipe of a nuclear power plant water pump according to the present invention, and the method may specifically include:
[0068] Step 101, determine the maximum pressure drop value ΔP of the filter max ;
[0069] Specifically, ΔP max It can be determined by the following formula:
[0070]
[0071] Wherein, K is the coefficient of formula (1), is a definite constant value; A0 is the initial flow cross-sectional area of filter; a is the clogging coefficient of filter, and its value is from 0 to 100%, and amax is the filter's Maximum blockage factor.
[0072] Since A0 is the initial cross-sectional area of the filter, when the filter is continuously blocked, its cross-sectional area becomes A0×(1-a), and its specific value depends on the size of the clogging coefficient a. When a reaches the maximum blocking coefficient, the cross-se...
Embodiment 2
[0102] refer to figure 2 , shows a structural block diagram of an embodiment of a device for determining the feasibility of installing a filter in the inlet pipe of a nuclear power plant water pump according to the present invention, the device includes: a first determining module 21, a second determining module 22, a judging module 23 and a second determining module Determining module 24; wherein,
[0103] The first determination module 21 is used to determine the maximum pressure drop value ΔP of the filter max ;
[0104] The second determination module 22 is used to determine the effective NPSH NPSHa of the water pump;
[0105] Judgment module 23, for judging ΔP max Is it less than NPSHa;
[0106] The third determining module 24 is used for determining ΔP when the judging module 23 max When it is less than NPSHa, it is determined that it is feasible to install a filter at the water pump inlet; it is also used when the judgment module 23 judges ΔP max When it is great...
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Abstract
Embodiments of the invention provide a method for determining feasibility of setting filters at inlet pipes of water pumps in nuclear power plants. The method comprises the following steps of: determining a maximum pressure reduction value <delta>Pmax of a filter; determining an effective net positive suction head NPSHa of a water pump; judging whether <delta>Pmax is smaller than NPSHa or not; when <delta>Pmax is smaller than NPSHa, determining that the operation of setting the filter at the inlet of the water pump is feasible; and when <delta>Pmax is greater than or equal to NPSHa, determining that the operation of setting the filter at the inlet of the water pump is unfeasible. According to the method, the feasibility of setting corresponding filters at inlet pipes of water pumps can beassessed and determined through a simple and effective manner before setting the filters at the inlet pipes of the water pumps, and the determination manner is convenient and easy to operate, so thatthe problem that the water pumps generate cavitation due to filter differential pressure increase as the corresponding filters are additionally arranged can be effectively avoided.
Description
technical field [0001] The invention relates to the technical field of data processing, in particular to a method and device for determining the feasibility of installing a filter in a water pump inlet pipe of a nuclear power plant. Background technique [0002] At present, many enterprise factories have water systems, which usually include water tanks, pipelines and water pumps. The safe and stable operation of water systems has also become a concern of enterprises. [0003] Taking the Daya Bay Nuclear Power Plant as an example, there are various water systems in the nuclear power plant, such as the important plant water system of the nuclear island, the equipment cooling water system, the chilled water system of the electrical plant, the circulating water treatment system, the fire water production system and so on. [0004] During the working process of the water system, it often occurs that foreign matter enters the gap between the outer ring of the water pump inlet pipe...
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