The oxygen cleaning of the oxygen diaphragm compressor has strong oxidizing properties, especially the high pressure and high temperature oxygen after being pressurized by the diaphragm compressor. The danger of properly cleaning, using and maintaining the diaphragm compressor is an important measure to prevent accidents. This article mainly introduces the method steps of diaphragm compressor cleaning and several problems that should be paid attention to in daily use.
1 . Purpose and scope of cleaning Oxygen diaphragm compressors must be cleaned prior to passing oxygen to remove harmful contaminants. Harmful contaminants include oil, grease, cotton, etc. that remain on the surface of diaphragm compressor components during manufacturing, thermal processing, assembly, and testing. If these contaminants are not removed, they may react with oxygen to cause a dangerous accident. The parts of the diaphragm compressor that are cleaned by heavy steam include all parts that are in direct contact with oxygen, namely coolers, valves, cylinder heads, diaphragms, all gas lines and other components.
2 . Cleaning requirements, steps and methods (1) Cleaning requirements In order to ensure the correct operation during the cleaning process and the parts after cleaning are no longer secondary pollution, to ensure the cleanliness of the diaphragm compressor, the following requirements are specified:
(l) The cleaning personnel should have a cleaning technology that is responsible for supervising the cleaning operation and the final inspection.
(2) The cleaning environment must be clean, completely oil-free, and have good ventilation. Cleaning personnel's clothing, shoes, and hands should be clean and free of oil.
(3) Any tools and equipment used in the cleaning process must be free of oil or oil.
(4) Cleaning personnel should wear masks and glasses to avoid damage to the face and eyes.
(5) After the cleaning is completed, it must be confirmed by the relevant personnel and recorded accordingly.
The choice of strong cleaning agent The main pollutants of the diaphragm compressor are edges and grease. Therefore, the cleaning agent generally uses chlorinated hydrocarbons to remove organic substances such as oil and grease on the surface of the parts. Commonly used cleaning agents are dichloromethane, perchloroethylene, trichloroethylene, etc. Their main chemical and physical properties are shown in Table 1.
At present, most manufacturers and users use carbon tetrachloride (CCL4) as a cleaning agent, but it is very toxic and should not be used at any time. It is recommended to use several cleaning agents in L:
(3) Cleaning method steps and inspection requirements l) Separating the diaphragm compressor into a cooler, a gas line, a gas valve, a cylinder head, a oil distribution plate, a diaphragm, a pressure regulating valve, a middle body, a casing, and a bearing end Cover and other parts. Inspection requirements: do not have to be completely removed, but there is no place to clean.
2) First wipe off the oil and grease on the surface of all parts with clean cotton wire. If there is oxide scale and weld, use wire brush to polish. Inspection requirements: Any parts should not have obvious oil flow and small pieces of grease.
3) Soak all the parts and assembled tools in the cleaning agent, soaking time is 6-sh, thoroughly remove the oil and grease on the surface. Inspection requirements: The surface of the parts is free of oil and grease.
4) Purge the parts and piping with high-purity nitrogen, thoroughly sweep away the cleaning agent that has dissolved the oil and grease. Inspection requirements: There is no trace of cleaning agent on the surface of the parts, and there is no cleaning agent flowing out of the outlet of the pipeline and the coolant.
5) Wipe the curved part of the cylinder head, the diaphragm, the air valve, the piping and the air circuit part of the cooler with a clean white paper or a lint-free white cloth. Inspection requirements: no oil stains appear on white paper or white cloth. The amount of contamination allowed for oxygen equipment is approximately 1076.43 m/m2 (100 mg / ft2).
6) After cleaning the inner surface of the crankcase, moving parts, cylinder block, oil distribution plate, piston and middle body, apply 4839 anti-chemical lubricating oil or silicone oil as soon as possible. The placement time before application is less than 10 min. Prevent rust.
7) Assemble the diaphragm compressor as required, and block the inlet and exhaust ports with a wooden plug. Pay attention to the secondary pollution during assembly, storage and transportation.
8) After the cleaning and acceptance is completed, the words “This equipment has been cleaned according to a certain cleaning procedure for oxygen use†should be indicated in the eye-catching position of the diaphragm compressor or packaging, and the date and personnel of the cleaning and inspection should be explained.
3 . Several problems should be paid attention to in daily use. In addition to the necessary cleaning of the components, the oxygen diaphragm compressor must pay attention to the following aspects during use:
( l ) The environment used must be clean, completely oil-free, and have good ventilation. Install a ventilation fan if necessary to allow the surrounding air to circulate.
[2] Pay attention to the maintenance and maintenance of the diaphragm compressor to ensure that the oil circuit can not leak, because the hydraulic oil used in the oxygen diaphragm compressor is the Type 4839 chemical-proof lubricating oil, which is very expensive.
(3) Special tools must be configured and cannot be borrowed from other workshops or departments to prevent oil or grease contamination.
(4) Equipment and piping for the use and storage of oxygen must also be oil-free. http://news.chinawj.com.cn Submission:
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