System and method for directly measuring total helium mass flow rate of primary loop of high-temperature gas cooled reactor

Abstract

The invention discloses a system for directly measuring the total helium mass flow rate of a primary loop of a high-temperature gas cooled reactor and belongs to the technical field of air mass flow rate measurement. The system comprises an elbow meter set, and a data acquisition and processing device. Single elbow meter comprises an elbow flow sensor, a differential pressure transmitter, a pressure transmitter and a temperature transmitter; the pressure transmitter is used for measuring helium differential pressure inside and outside the elbow flow sensor; the pressure transmitter is used for measuring helium pressure; the temperature transmitter is used for measuring helium temperature; and the data acquisition and processing device is connected with the output ends of the differential pressure transmitter, and the pressure transmitter and the temperature transmitter of each elbow flow meter respectively and is used for calculating the helium mass flow rate according to differentialpressure signals, pressure signals and temperature signals and calculating the total helium mass flow rate of the primary loop of the high-temperature gas cooled reactor by multiplying the helium mass flow rate by a correction factor. The system has a simple structure, is high in reliability and reproductibility accuracy, and does not have additional pressure loss.

Description

technical field [0001] The invention relates to the technical field of gas mass flow measurement, in particular to a system and method for directly measuring the total mass flow of helium in a primary circuit of a high-temperature gas-cooled reactor. Background technique [0002] In the 10MW high-temperature gas-cooled experimental reactor (HTR-10), ceramic coated granular fuel elements are used, with graphite as the moderator and helium as the coolant. The heat carried by the helium in the primary circuit heats the water in the secondary circuit into steam through the steam generator, and sends it to the steam turbine for power generation [1] . In order to ensure the safe operation of the reactor, the mass flow rate of helium in the primary circuit is one of the essential thermal parameters for performing the reactor protection function and calculating the thermal power of the reactor. Due to the limitations of the internal structure of the high-temperature gas-cooled exp...

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Problems solved by technology

It can be seen that there is no position suitable for installing a flow meter for directly measuring the total flow of helium in the primary circuit helium circulation channel of the high-temperature gas-cooled demonstration reactor; although the 14 cold helium risers 4 have installed orifice plates and Venturi tube throttling However, the same flowmeter must be installed to maintain the balance of its flow resistance; at this time, the total mass flow rate of the primary circuit helium can be obtained from the sum of the sub-flows of the cold helium riser 4, but only It can be regarded as the measurement result obtained by one measurement channel, which cannot meet the redundancy requirements; in addition, the pressure loss of the orifice plate and the Venturi tube throttling device is relatively large, which will increase the power requirement of the helium fan

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