Thermotechnical natural circulation experimental instrument with stepless flow velocity adjusting device and method

Abstract

The invention discloses a thermotechnical natural circulation experimental instrument with a stepless flow velocity adjusting device and a method, and belongs to the field of experimental equipment. In the stepless flow rate adjusting device in the thermal natural circulation experimental instrument, a flow rate adjusting pipe is provided with a flow inlet and a flow outlet; the flow inlet is notlocated at the upstream of the flow outlet in the flowing direction of the fluid in the flow velocity adjusting pipe; the flow inlet and the flow outlet are connected with the first water tank to forma first circulation loop, and the first water pump is a velocity regulating water pump. The water inlet flow velocity can be changed by adjusting the water pump, the water plug effect is achieved inthe flow velocity adjusting pipe, and therefore the flow velocity of fluid in the thermotechnical natural circulation experimental instrument is adjusted. In addition, the top of the circulating pipeline can be opened, and the circulating pipeline is externally connected with an exhaust water supplementing device and used for regularly sucking gas generated in the circulating pipeline and supplementing fluid loss. The stepless flow velocity adjusting device can adjust the flow velocity of the fluid in the thermotechnical natural circulation experimental instrument to a required value accordingto actual requirements, and stepless velocity change adjustment is achieved.

Description

technical field [0001] The invention belongs to the field of experimental instruments, and in particular relates to a thermal natural circulation experimental instrument and method with a stepless flow rate regulating device. Background technique [0002] The Thermal Natural Circulation Experimental Instrument is a test instrument used to simulate the natural circulation process in a nuclear reactor. The so-called natural circulation refers to the closed circuit that does not depend on the external power source, and only uses the driving pressure generated by the density difference between the hot and cold fluids and the height difference to overcome the local resistance and frictional resistance of the pipeline along the way. A circular flow. [0003] In this type of thermal natural circulation tester, it is necessary to simulate the operating conditions at different flow rates, so the flow rate in the tube needs to be adjusted. Traditional flow rate adjustment is realize...

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Problems solved by technology

Traditional flow rate adjustment is achieved through valves, but due to the small flow rate formed by natural circulation flow, it is difficult to ensure that the flow curve of ordinary valves is linear, so it is difficult to use ordinary valves to achieve accurate low flow rate control

The special valve is relatively expensive, and its cost is too high for the thermal natural circulation tester only used for testing, so it is difficult to popularize and use it.

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