Air current baking system and method of large size vacuum vessel
A technology of vacuum container and baking method, which is applied in the direction of climate sustainability, reduction of greenhouse gas, coating, etc., can solve the problems of small thermal conductivity of stainless steel, affecting life, structural safety damage, etc., to achieve uniform heating of the structure, Increase reliability and avoid damage effects
Inactive Publication Date: 2007-08-01
INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
For example, Russia's T-15 Tokamak device and my country's HL-2A Tokamak device, but the disadvantages of this method are that due to the relatively small thermal conductivity of stainless steel, the temperature distribution of the container wall after heating is very uneven, especially the cloth with The local temperature of the electric heating wire is very high, and the temperature of the part deviated from the heating wire is very low, so it is easy to form a large temperature difference, which will cause excessive local thermal stress in the container and damage the structural safety. At the same time, the heating wire at high temperature Easy to oxidize, affecting life
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[0012] The system flow is as follows:
[0013] 1. The nitrogen flow first comes out of the nitrogen storage tank, passes through the compression fan, muffler and filter, then passes through the heat exchanger to raise the temperature to 140 degrees, and then passes through the heater to heat the air flow temperature to 300 degrees, and finally enters the large The interlayer channel or pipe on the wall of the vacuum container (the interlayer channel refers to the inside of the device wall, the pipe refers to the installation on the surface of the device wall, and the interlayer channel or pipe has inlet and outlet air ports all set on the outer wall of the vacuum container), nitrogen The flow temperature can be controlled by adjusting the heater voltage.
[0014] 2. After the nitrogen flow is circulated in the interlayer of the vacuum container or the pipeline, the temperature of the air flow out is 250 degrees, and it returns to the heat exchanger for heat exchange. The tempe...
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The invention disclosed the system and method of air flow baking of coconut vacuum vessel, the characteristic of which is that the flow of hot gas flows through the interlayer channel or conduct pipe, whose inlet and exit of the gas are installed on the outer wall of vacuum vessel, installed on the chamber wall of vacuum vessel, baking the internal wall of vacuum vessel with the heat from air flow dissipating heat effect. The advantages of the invention are structure heated homogeneously, small temperature difference and small thermal stress, enhancing the reliability of baking system.
Description
technical field [0001] The invention belongs to a method for treating the baking wall of a vacuum inner wall. Background technique [0002] Large-scale vacuum containers have been widely used in aerospace nuclear energy and other fields, especially controlled magnetic confinement nuclear fusion devices. It is the direct place for plasma operation. Its vacuum must reach ultra-high vacuum (10-7Pa) to realize D-D ( Deuterium) and D-T (tritium) nuclear fusion reaction to produce high temperature plasma. For similar large ultra-high vacuum vessels, the wall must be baked before operation, mainly because the stainless steel structural materials are all obtained by melting and casting. During the smelting process, compounds such as hydrogen, oxygen and carbon dissolve in the material to varying degrees. During the manufacturing process, other substances permeate into the material body due to changes in the compactness of its own structure. In this way, when vacuuming, the resoluti...
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IPC IPC(8): C21D1/767C23C8/80G21B1/00
CPCY02E30/10
Inventor 宋云涛姚达毛武松涛翁佩德
Owner INST OF PLASMA PHYSICS CHINESE ACAD OF SCI