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A type selection method and system for safety valves of feedwater heaters in nuclear power plants

A technology of feed water heater and safety valve, applied in the field of nuclear power, can solve problems such as shortage

Active Publication Date: 2018-06-15
中广核工程有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The embodiment of the present application provides a safety valve selection method and system for a nuclear power plant feed water heater, which solves the lack of an effective and reliable method to select a suitable type of safety valve for the safety valve selection of a nuclear power plant feed water heater in the prior art. Valve to ensure the safe operation of the feed water heater, through the design and estimation of the flow rate of the safety valve of the feed water heater in the nuclear power plant, and at the same time considering the steam flow rate when the regulating valve on the pipeline connected to the steam-water separation reheater fails to fully open , and according to the HEI standard, the flow of feed water entering the heater shell when the heat exchange tube is broken, and based on these two flows to determine the flow rate of the safety valve, based on this flow rate design a suitable safety valve or select a suitable Model safety valve, based on this safety valve to maintain the pressure value of the feed water heater within the safe pressure range, thereby improving the reliability of the feed water heater of the nuclear power plant and improving the safety of the nuclear power plant operation

Method used

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  • A type selection method and system for safety valves of feedwater heaters in nuclear power plants
  • A type selection method and system for safety valves of feedwater heaters in nuclear power plants
  • A type selection method and system for safety valves of feedwater heaters in nuclear power plants

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Embodiment 1

[0062] In the specific implementation process, the feedwater heating system of a nuclear power plant is generally composed of two high-pressure feedwater heater columns, and each column includes a No. 6 high-pressure feedwater heater and a No. 7 high-pressure feedwater heater (hereinafter referred to as "high plus" ),Such as figure 2 As shown, first introduce the No. 6 high-pressure tube, which mainly includes the shell 10a and the heat exchange tube 20a (specifically, it can be U-shaped, including the water inlet 201a and the water outlet 202a); wherein, the shell 10a forms a closed space 30a, is divided into two chambers (i.e. water chamber 301a and heating chamber 302a) by a dividing plate; There is a low-temperature feedwater inlet pipe 101a for connecting with the feedwater pump, and a high-temperature feedwater outlet pipe 102a for connecting with the next-level equipment is arranged on the shell of the hot water half chamber 3012a; the heat exchange pipe 20a is arrange...

Embodiment 2

[0135] Based on the same inventive concept, the embodiment of this application also provides a safety valve selection system for nuclear power plant feedwater heaters, please refer to Figure 7 The feedwater heater of a nuclear power plant includes a shell and a heat exchange tube; the shell is provided with a drain pipe with a drain flow regulating valve connected to the steam-water separation reheater of the nuclear power plant; the steam-water separation reheater The heater provides drainage for the feed water heater through the drain pipe, so as to heat the feed water in the heat exchange tube as the heat source of the feed water heater; An exhaust pipeline for exhausting steam when the internal pressure exceeds the safety critical pressure value; the exhaust pipeline is provided with a safety valve for controlling the exhaust flow; the safety valve selection system includes:

[0136] The first calculation module 701 is configured to calculate and obtain the first flow are...

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Abstract

The invention discloses a safety valve type selection method and system for a nuclear power plant feed water heater, which is used to solve the lack of an effective and reliable method to select a suitable type of safety valve in the type selection of the nuclear power plant feed water heater safety valve in the prior art To solve the technical problem of ensuring the safe operation of the feed water heater, the method includes: calculating and obtaining the first flow area of ​​the safety valve based on the working condition that the hydrophobic flow regulating valve is in a fully open state; According to the working condition of the breach, the second flow area of ​​the safety valve is calculated; based on the first flow area and the second flow area, the flow rate of the safety valve is determined, and the flow rate is determined based on the flow rate. Safety valve type selection; realize the design and calculation of the safety valve flow rate of the nuclear power plant feed water heater according to the actual application situation, and design or select a suitable safety valve based on the flow rate to ensure that the pressure value of the feed water heater can be maintained within the safe pressure range .

Description

technical field [0001] The invention relates to the technical field of nuclear power, in particular to a type selection method and system for a safety valve of a feed water heater of a nuclear power plant. Background technique [0002] The feed water heating system of the nuclear power plant is an important process system of the conventional island of the nuclear power plant. The main equipment in the feed water heating system of the nuclear power plant is the feed water heater, such as figure 1 As shown, the feed water heater is a surface heat exchanger for heating feed water, mainly composed of a shell 10 and a U-shaped heat exchange tube 20 (including a water inlet 201 and a water outlet 202); the shell 10 constitutes a sealed shell space, the U-shaped heat exchange tube 20 is set in the housing space; the housing 10 is provided with a water supply inlet 101 and a water supply outlet 102 respectively connected to the water inlet 201 and the water outlet 202 of the U-shape...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 王学华王志明石建中
Owner 中广核工程有限公司