Chemical cleaning of oxygen and nitrogen pipelines in water-coal slurry gasification
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I would like to ask the experts: the oxygen pipeline used in slurry coal gasification is made of stainless steel. What are the requirements for the material used for temporary connections? ? Is it possible to connect a nitrogen tank made of carbon steel to an oxygen pipeline for chemical cleaning? ? How to control the cleaning quality during the process? ?
The common practice is to treat oxygen pipelines using either immersion degreasing or cyclic degreasing methods. After the oxygen pipelines have passed the tests using fluorescence and camphor ball detection methods, no further chemical cleaning is required. For nitrogen pipelines in case of accidents, temporary pipes are used for chemical cleaning; the connections are usually valves, and these valves are already fully degreased before leaving the factory, so there are no issues in this regard. Immersion degreasing is applied to oxygen pipelines during the construction phase, while cyclic degreasing is used during the pre-commissioning stage.