Simulation method for heat exchange performance of straight tube type once-through steam generator

Abstract

The invention discloses a simulation calculation model for the heat exchange performance of a straight tube type once-through steam generator and an algorithm thereof. According to the simulation calculation model, a one-dimensional homogeneous flow mathematic model of the once-through steam generator based on heat transfer partition is established, a secondary side heat exchange process is divided by adopting appropriate distinguishing conditions, a once-through steam generator heat exchange simulation program based on MATLAB (matrix laboratory) software is developed independently on the basis of the simulation calculation model, and the simulation for the steady state heat exchange performance of the once-through steam generator under different working conditions is carried out. The programming difficulty is simplified and reduced, automatic judgment and piecewise calculation can be realized, the range and position of wall temperature uprise and the lengths of heat exchange tubes in all heat transfer areas under different working conditions are accurately predicted, and thus a serious working area of the once-through steam generator is obtained. Theoretical support can be provided for preventing the accidents, such as overtemperature tube burst, of the once-through steam generator.

Description

technical field [0001] The invention belongs to the technical field of nuclear power, and relates to a simulation method for the heat exchange performance of a straight-tube direct-flow steam generator. Background technique [0002] The once-through steam generator is an important equipment in nuclear reactors, and has been mostly used in integrated pressurized water reactors in recent years. Since the working medium on the secondary side will be evaporated to dryness during the process of being heated from supercooled water to superheated steam, it is easy to cause the heat transfer tube to rupture, which in turn leads to serious problems such as shutdown of the entire reactor and nuclear radiation leakage. Therefore, the safety and reliability of once-through steam generators during the operation of nuclear power plants has attracted great attention. [0003] In 1982, Walter applied the first-order one-dimensional conservation equation, and used the drift flow model to de...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a simulation method for the heat transfer performance of straight-tube once-through steam generators, which solves the problems of complicated heat transfer calculation methods and inaccurate calculation results of heat transfer tube wall temperature in current once-through steam generators

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