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Operation process and attention of passing high-purity hydrogen into the atmosphere furnace
1. Check the airtightness of the furnace. After installing the flange, hold the pressure for 2 hours to see if the pressure gauge deflects. The next step should be carried out when the airtightness is intact.
2. Use the vacuum pump to pre vacuum the gas in the furnace:
(1) Connect the outlet nozzle of the tubular furnace with the vacuum hose.
(2) Pre vacuum the furnace chamber to -0.08MPa,
(3) , and then introduce the protective gas (nitrogen or argon is better),
(4) Pre vacuum the furnace chamber to -0.08MPa
(5) Cycle for several times to meet the requirements of furnace atmosphere.
3. After the chamber is cleaned, vacuumize the furnace body, and then flush hydrogen into it. As hydrogen is a dangerous gas, and its content is between 4% and 75%, it will explode with air. Therefore, after the chamber is cleaned, it is necessary to check whether the chamber is cleaned, that is
Whether the hydrogen in the furnace is pure. At this time, hydrogen should be purified with hydrogen purification equipment to ensure high purity of hydrogen.
4. After using high-purity hydrogen, let the hydrogen enter from the back and exit from the front. In order to prevent the hydrogen from accumulating too much in the furnace and causing excessive pressure in the furnace, the best way is to insert the gas outlet into the mineral water bottle filled with water. The mineral water bottle should be placed outdoors. Turn the gas outlet valve to the maximum and adjust the gas flow through the air inlet valve.
5. Heat the furnace after the gas flow is normal,
6. Turn off the gas after the furnace is shut down, and turn off the gas after the furnace is cooled down. To avoid danger.
When the vacuum atmosphere furnace is filled with hydrogen, remember to use the discharged gas, instead of directly discharging it into the air. The contact between hydrogen and oxygen will cause danger. When vacuuming, remember to pump the air clean, and when necessary, use nitrogen to flush it before entering the atmosphere.
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