Device and method for reducing thermal fatigue in cold and thermal fluid mixing process in T-shaped pipe

Abstract

The invention discloses a device for reducing thermal fatigue in the cold and thermal fluid mixing process in a T-shaped pipe, and the device is composed of porous media which is installed in the cold and thermal fluid mixing zone of the T-shaped pipe; the invention further discloses a method for reducing thermal fatigue in the cold and thermal fluid mixing process in the T-shaped pipe. In the invention, the fluid mixing zone of the T-shaped pipe is filled with porous media, and speed fluctuation and temperature fluctuation in the cold and thermal fluid mixing process can be restrained, thus weakening the thermal shock of the cold and thermal fluid on the pipe wall, effectively reducing transient temperature and time average temperature and temperature fluctuation range, improving energy spectrum characteristics of transient temperature fluctuation and reducing the thermal fatigue of the T-shaped pipe.

Description

technical field [0001] The invention relates to the technical field of thermal fatigue protection, in particular to a device and method for reducing thermal fatigue during the mixing process of cold and hot fluids in a T-shaped pipe. Background technique [0002] There are a large number of T-shaped pipes in petrochemical, aerospace, nuclear power plants and thermal power plants, HVAC, liquefied natural gas terminals and many other fields. A three-dimensional T-shaped pipe cold and hot fluid mixing process in the prior art is as follows: figure 1 As shown, the section of the main pipe and the branch pipe are both square, and the side length of the main pipe is d m is 100mm, side length of branch pipe d b is 50mm; the inlet of the main pipe is hot water, and the inlet temperature is T h is 343.48K, the inlet velocity is 0.15m / s; the branch pipe inlet is cold water, and the inlet temperature T c It is 296.78K, and the entrance velocity is 0.3m / s. During the mixed flow of c...

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Problems solved by technology

[0003] The problem to be solved by the embodiments of the present invention is to provide a device and method for reducing thermal fatigue during the mixing of hot and cold fluids in T-shaped pipes, so as to overcome the temperature fluctuations caused by the mixing of hot and cold fluids inside the T-shaped pipes in the prior art. Defects Inducing Thermal Fatigue of T-shaped Pipes

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