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Surface pre-oxidation device and method for improving vapor oxidation resistance of heat resisting material

A heat-resistant material, anti-steam technology, applied in metal material coating process, solid-state diffusion coating, coating and other directions, can solve problems such as large surface treatment equipment, other performance changes, accelerated oxidation process, etc., to improve the steam resistance. Oxidation performance, device and method are easy and simple to operate

Active Publication Date: 2017-05-24
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] Although these methods can improve the steam oxidation resistance of materials to a certain extent, each method has certain limitations, such as: the Cr plating layer formed by the Cr plating treatment in method (1) is easy to It falls off from the surface, so that the base material is directly exposed to high-temperature steam, further accelerating the oxidation process; (2) The shot peening process requires huge surface treatment equipment, and the processing cost is high; (3) The combined addition of Cr, Si, Al and other elements Will cause changes in other properties of the material

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  • Surface pre-oxidation device and method for improving vapor oxidation resistance of heat resisting material

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0031] Such as figure 1 As shown, a surface pre-oxidation device for improving the steam oxidation resistance of heat-resistant materials provided by the present invention includes a gas mixer 5, an ozone generator 1 and an inert gas storage tank 2 connected to the inlet of the gas mixer 5, respectively. No. 1 flowmeter 3 and No. 2 flowmeter 4 on the pipeline where gas mixer 5 communicates with ozone generator 1 and inert gas storage tank 2, heat-resistant steel or alloy communicated with gas mixer 5 outlet through circulation pipeline 8 The tube panel 6 is an ozone detector 7 arranged at the outlet of the heat-resistant steel or alloy tube panel 6, and the outlet of the gas mixer 5 is connected to the inlet of the heat-resistant steel or alloy tube panel 6 through a circulation pipeline 8 to form a loop.

[0032] Such as figure 1 As shown, a surface pre-oxidation o...

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Abstract

The invention discloses a surface pre-oxidation device and method for improving vapor oxidation resistance of a heat resisting material. Ar / O3 mixed gas containing a trace amount of ozone reacts with heat resisting steel or an alloy pipe panel interface at 0-40 DEG C, and the element Cr is oxidized into a dense Cr-rich oxidation film so as to effectively prevent oxygen ions or hydroxide ions from spreading towards the heat resisting steel and an alloy matrix, and prevent metal iron ions from spreading towards the oxide and vapor interface. The device can be applied to surface pre-oxidation treatment of a power station boiler or vapor generator manufacturing plant after pipe bundle or pipeline processing, and can also be applied to surface pre-oxidation treatment of pipe bundles or pipelines of a power station boiler or a vapor generator after assembling but before operation, the pipe bundles or the pipelines do not need to be detached before a unit operates, and cyclic pre-oxidation of inert gas / O3 is carried out only through inlet and outlet collection tanks of superheater or reheater pipe bundles. According to the surface pre-oxidation device and method, the principle is simple, implementation is easy, and the application prospects are broad.

Description

technical field [0001] The invention relates to the technical field of material technology, in particular to a low-temperature ozone surface pre-oxidation device and method for improving the resistance to high-temperature steam oxidation of heat-resistant steel and alloy materials. Background technique [0002] At present, improving the steam parameters of fossil fuel generating units is one of the most effective methods to improve the utilization rate of fossil energy and reduce pollutant emissions. In the practical application of fossil fuel-burning ultra-supercritical generator sets, the main steam pressure and main steam temperature can reach 26-31MPa and 605-623°C, respectively. However, under the condition of high temperature and high pressure, the problem of anti-steam oxidation of high-temperature components of the unit becomes more and more prominent. For example, the tube bundles and pipes in which high-temperature and high-pressure steam flows in power plant boil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/14
CPCC23C8/14
Inventor 梁志远于淼徐洪王云刚赵钦新
Owner XI AN JIAOTONG UNIV
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