A thermal natural circulation experimental instrument and method with stepless flow rate adjustment device

Abstract

The invention discloses a thermal natural circulation experimental instrument and a method with a stepless flow rate adjusting device, belonging to the field of experimental equipment. In the stepless flow rate adjustment device in the thermal natural circulation experiment instrument, the flow rate adjustment pipe is provided with an inlet port and an outlet port; and along the flow direction of the fluid in the flow rate adjustment pipe, the inlet port is not located upstream of the outlet port; The inflow port and the outflow port are respectively connected with the first water tank to form a first circulation loop, and the first water pump is a speed-adjusting water pump. By adjusting the water pump, the flow rate of the influent water can be changed, and the water plug effect can be realized in the flow rate adjustment pipe, so as to realize the flow rate adjustment of the fluid in the thermal natural circulation experiment instrument. In addition, the present invention can also open the top of the circulation pipeline and connect an external exhaust and water supply device, so as to periodically pump the gas generated in the circulation pipeline and supplement the loss of fluid. The stepless flow rate adjusting device of the present invention can adjust the fluid flow rate in the thermal natural circulation experimenter to a required value according to actual needs, so as to realize stepless speed change adjustment.

Description

technical field [0001] The invention belongs to the field of experimental instruments, in particular to a thermal natural circulation experimental instrument and a method with a stepless flow rate adjustment device. Background technique [0002] Thermal Natural Circulation Experimenter is an experimental instrument used to simulate the natural circulation process in nuclear reactors. The so-called natural circulation refers to a closed loop that does not rely on external power sources and only uses the driving pressure generated by the density difference between the hot and cold fluids and the high and low head differences to overcome the local resistance and frictional resistance of the pipeline along the way. A cyclic flow. [0003] In this type of thermal natural circulation experimental instrument, it is necessary to simulate the operating conditions under different flow rates, so the flow rate in the pipe needs to be adjusted. The traditional flow rate adjustment is a...

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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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