Sleeving method for multi-layer screw-type heat exchanging tube bundles

Abstract

The invention relates to the technical field for thermal engineering, and discloses a sleeving method for multi-layer screw-type heat exchanging tube bundles. The sleeving method for the multi-layer screw-type heat exchanging tube bundles comprises the following steps: first bearing strips are arranged on first layer heat exchanging tube bundles; an inner barrel is sleeved with the first layer heat exchanging tube bundles; fixing strips are arranged outside the first layer heat exchanging tube bundles; second bearing strips are arranged on second layer heat exchanging tube bundles; the first layer heat exchanging tube bundles are sleeved with the second layer heat exchanging tube bundles; the fixing strips are arranged outside the second layer heat exchanging tube bundles; other heat exchanging tube bundles are sleeved; the outer sides of outer layer heat exchanging tube bundles are sleeved with an outer barrel; the bearing strips are connected with a suspension ribbed plate arranged on the top of the inner barrel. According to the sleeving method for the multi-layer screw-type heat exchanging tube bundles, sleeving on a screw-type heat exchanging tube bundle vapor generator of flexible supporting can be smoothly achieved, the scratch on the surfaces of the tube bundles by supporting parts of the heat exchanging tube bundles can be effectively avoided, and the screw diameter accuracy of the fixed heat exchanging tube bundles is guaranteed.

Description

technical field [0001] The invention relates to the technical field of thermal engineering, in particular to a method for fitting multilayer spiral heat exchange tube bundles. More specifically, a method for fitting and securing helical coiled tubing. Background technique [0002] The gas-cooled reactor steam generator is a once-through steam generator. In order to prevent the instability of vapor-liquid two-phase flow in the heat exchange tube, the mass flow rate of the heat transfer medium (water or steam) in the heat exchange tube must not be less than the critical mass flow rate. At the same time, since the heat-carrying medium in the tube needs to be heated from supercooled water to high-heat steam, the enthalpy rise per unit medium is very large. At the same time, since the heat-carrying medium on the primary side is gas, the corresponding convective heat transfer coefficient is relatively small, which makes the heat exchange tube of the once-through steam generator ...

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is that the installation process in the heat exchange tube set of the spiral tube steam generator of the air-cooled reactor is complicated, the installation period is long, and the surface is scratched or the heat exchange tube is stuck by the supporting parts

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