Method for improving Reynolds number of condensed water flow device

Abstract

The invention discloses a method for improving the verification Reynolds number of a condensed water flow device. The method comprises the following steps: 1), checking that valves F1, F2, F3, F4, F5,F6, F7, F8 and F10 in the condensed water flow device are in a closed state, and F9 is located at a position A; 2) injecting water into the system until a water tank is filled with water and clean water overflows from an overflow port, and closing the F1; 3) performing system preheating: starting a water pump, stabilizing the water pressure through a pressure stabilizing box, circulating the water in the water tank in the system, and preheating the whole system for 20 minutes; 4) filling a standard water tank with hot water, fully infiltrating the container wall of the standard water tank, and draining the water; 5) repeating the step 4) for 2-3 times; 6) draining water from the system: draining the water in the water tank into a lower water tank of a cooling tower of a power plant; and 7) injecting circulating water outlet high-temperature water of the power plant into the water tank for the second time and starting the calibration process of the flow device. The calibration Reynoldsnumber and the calibration precision of the flow device are improved by utilizing the waste heat of the high-temperature circulating water of the power plant.

Description

technical field [0001] The invention relates to a verification method, in particular to a method for verifying the Reynolds number of a condensate flow device. Background technique [0002] At present, a large number of high-precision flow devices are used in thermal power, gas-steam combined cycle, and nuclear power plant unit performance tests. Among them, ASME flow nozzles are the most accurate, and the measurement accuracy can reach 0.15%. The measurement principle is to measure the fluid (the general working medium is Water) flow through the nozzle body to calculate the pressure drop. These flow devices have high measurement accuracy, mainly because they have been strictly calibrated on the standard test bench before use. The calibration process is a process of comparison with the standard device. In actual engineering use, the calibrated flow nozzles pass Using the outflow system obtained from the calibration for flow calculation can greatly improve the test accuracy....

AI Technical Summary

Problems solved by technology

[0005] In the actual operation of the power plant, the main condensate temperature is generally above 100°C, and the Reynolds number of the nozzle throat reaches 7.0×10 6 ~9.0×10 6 , while domestic nozzle calibration tests are mostly carried out at room temperature (summer is generally between 20°C and 25°C, winter is generally between 10°C and 15°C), and the calibration Reynolds number is generally 1.0×10 6 ~3.0×10 6 Between, there is an error in Reynolds number extrapolation

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