Measurement method of high temperature and high pressure working fluid flow distribution in parallel tube bundles

Abstract

The invention discloses a method for measuring the flow distribution of a high-temperature and high-pressure working medium in parallel tube bundles. The method comprises the following steps: 1) determining an enthalpy value of cooling water at a water inlet of a casing pipe, determining an enthalpy value of cooling water at a water outlet of the casing pipe, determining the heat exchange power of cooling water in the casing pipe, and establishing a heat balance equation under the current cooling water flow in the casing pipe; 2) changing the flow of cooling water in the casing pipe, and repeating the step 1); 3) according to the established heat balance equation under the cooling water flow in the casing pipe for two times, solving the mass flow GH and the enthalpy value hH1 of the high-temperature high-pressure steam-water two-phase flow working medium at the inlet of a branch pipe. The method can achieve the flow measurement of the high-temperature high-pressure steam-water two-phase flow working medium in the tube bundle, and can solve the problems that interference is generated to flowing of the high-temperature and high-pressure steam-water two-phase flow working medium in the measurement process, a measurement device cannot bear pressure and resist heat and equipment calibration is difficult.

Description

technical field [0001] The invention belongs to the field of two-phase flow measurement, and relates to a method for measuring flow distribution of high-temperature and high-pressure working fluid in parallel tube bundles. Background technique [0002] In recent years, my country's ultra-supercritical generating units have developed rapidly. With the advantages of large capacity, high parameters, and high efficiency, they have gradually become the mainstream of thermal power equipment development. The design and optimization of the ultra-supercritical unit boiler water wall is the key to the safe and stable operation of the ultra-supercritical boiler. Accurately predicting the flow distribution of two-phase flow in the parallel branch pipes of the header is an important guarantee for the design and operation of the header, and plays an important role in the state monitoring, process control and safe operation of the two-phase flow system. In order to establish a calculation...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide a method for measuring the flow distribution of high-temperature and high-pressure working fluid in parallel tube bundles, which can realize the flow measurement of high-temperature and high-pressure steam-water two-phase flow working fluid in the tube bundle, and It can avoid the interference to the flow of high temperature and high pressure steam-water two-phase flow during the measurement process, the measurement device cannot withstand pressure and heat, and the problem of difficult equipment calibration

Images