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Measurement method for reverse backflow amount of vapor generator heat conduction tube and system of measurement method

A steam generator and measurement system technology, applied in reactors, nuclear power generation, nuclear reactor monitoring, etc., can solve the problems of difficult backflow flow measurement, complex steam generator structure, and insufficient installation space, so as to avoid insufficient space and structural damage , good use prospects and market application value, and the effect of reducing technical difficulty and cost

Inactive Publication Date: 2017-09-05
NUCLEAR POWER INSTITUTE OF CHINA
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: due to the complexity of the structure of the steam generator and the lack of installation space, it is only possible to judge whether there is backflow in the pipe, but the flow information cannot be obtained
The purpose of the present invention is to provide a method for measuring the flow rate of the reverse flow of the heat transfer tube of the steam generator. Under the condition that no flow measuring device is installed on the internal heat transfer tube bundle of the steam generator, the present invention uses the conservation principle and Pressure drop and temperature measurement can effectively obtain the total reverse flow of the heat transfer tube on the primary side of the steam generator due to flow reversal, which solves the problem of difficult measurement of reverse flow caused by complex structure and insufficient installation space

Method used

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  • Measurement method for reverse backflow amount of vapor generator heat conduction tube and system of measurement method
  • Measurement method for reverse backflow amount of vapor generator heat conduction tube and system of measurement method
  • Measurement method for reverse backflow amount of vapor generator heat conduction tube and system of measurement method

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Embodiment 1

[0039] A measurement system for reverse and reverse flow of steam generator heat transfer tubes, such as figure 1 As shown, it includes a flow meter 1 , an inlet temperature measuring device 8 , an inlet pressure measuring device 9 , an inlet chamber temperature measuring device 7 , and an outlet chamber temperature measuring device 10 .

[0040] The measurement system of the present invention is applied to a U-shaped tube steam generator, wherein the U-shaped tube steam generator includes a primary side and a secondary side 2 . According to the flow direction, the primary side is followed by an inlet chamber 5, a U-shaped heat transfer tube bundle 3 and an outlet chamber 6. The U-shaped heat transfer tube bundle 3 is fixed on the tube sheet 4 in the steam generator, and the inlet chamber 5 and the outlet chamber The front and rear ends of the chamber 6 are respectively connected with the inlet pipe and the outlet pipe of the steam generator. The secondary side 2 of the steam...

Embodiment 2

[0050] The difference between this embodiment and Embodiment 1 is that this embodiment provides the structure of the optimized inlet chamber temperature measuring device 7, which includes a temperature measuring assembly 71, a thermocouple 72, a sealing pad 73 and hold-down nut 74, concrete settings are as follows:

[0051] The front end of the temperature measuring component 71 is welded on the pipe wall on the primary side of the steam generator, and the rear end is sealed by a gasket 73 and a compression nut 74 . A through hole is opened on the pipe wall at the position of the welding temperature measuring assembly 71, and a through hole corresponding to the through hole on the pipe wall is set on the temperature measuring assembly 71 at the same time, and the thermocouple 72 passes through the temperature measuring assembly 71 and the through hole on the pipe wall. The hole is inserted into the fluid to be tested on the primary side of the steam generator for temperature m...

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Abstract

The invention discloses a measurement method for the reverse backflow amount of a vapor generator heat conduction tube and a system of the measurement method, and aims to solve the problems that only whether backflow is caused inside a tube or not can be judged and flow information of the tube cannot be acquired as a vapor generator is complex in structure and insufficient in mounting space. The measurement method comprises the following steps: (1) measuring the pressure P, the flow Win and the fluid temperature Tin of a primary side inlet of a vapor generator, measuring the temperature Tav, i of a primary side inlet chamber of the vapor chamber, and measuring the temperature Tav, o of a primary side outlet of the vapor generator; (2) according to a water and vapor thermal property table, respectively checking corresponding enthalpy values hin, hF and hR of Tin, Tav, i and Tav, o under a condition of pressure P; and (3) according to equations as shown in the specification, calculating a backflow amount WR. The measurement method has the advantages that the backflow amount of the vapor generator heat conduction tube is acquired, the technical difficulties and the cost of measurement are lowered, and flow measurement reliability and practicability are improved.

Description

technical field [0001] The invention relates to the technical field of thermal hydraulics and safety of reactors, in particular to a method for measuring the reverse flow rate of a heat transfer tube of a steam generator. Background technique [0002] The new generation of nuclear power plant reactors puts more emphasis on the inherent safety of the system, and its notable feature is that the reactor can discharge heat in a passive way when the external power source is lost. The popularization of passive safety technology makes the technology of reactor natural circulation operation more important. In the passive operation mode, the coolant in the primary circuit of the reactor is driven by the gravity pressure head generated by its own density difference to carry out natural circulation in the system. Compared with forced circulation powered by a circulation pump, the driving force under natural circulation conditions is weak and not constant. For example, a number of exp...

Claims

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Application Information

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IPC IPC(8): G21C17/032
CPCG21C17/032Y02E30/30
Inventor 唐瑜谢添舟徐建军黄彦平周慧辉谭曙时
Owner NUCLEAR POWER INSTITUTE OF CHINA
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