Why does the bright annealing furnace use hydrogen
Nov. 19, 2020
Why does the bright annealing furnace use hydrogen
If the temperature is too high, it is possible to oxidize some metal elements in the steel, and use hydrogen as a protective gas. We know that hydrogen is reducing and can reduce some metal oxides when heated. When annealing, because the temperature is still Very high, hydrogen can reduce certain oxidized metals, thereby protecting the quality of steel. Nitrogen does not have this property, so hydrogen is used.
Regulations for safe use of hydrogen in bright annealing furnace:
1. Check protective measures and wear protective equipment.
2. Regularly check whether the equipment, pipes, meters, and electrical appliances are normal; whether the gas, electricity, and water systems are unblocked; check the air tightness of each seal, water seal and other parts. Air leakage, electricity leakage, water leakage, poor electrical contact or instrument failure should be repaired in time.
3. The gas generator should be operated by a dedicated person to determine a high degree of responsibility.
4. Coal should be added frequently, less coal, and drills should be drilled frequently to ensure that there is no coking inside the furnace.
5. Ensure the normal water level in the air bag, prevent water-free operation, and pay attention to the reading on the air bag pressure gauge, and it must be controlled below 1 kg.
6. The coal seam is controlled at about 1.4 meters (gas space distance). To prevent too much ash, coal seam is too low to burn the hood. Put an end to lazy ash, coal seam is too high, burned bell jar and formed gas outlet temperature is too high.
7. The ash tray should rotate 1/4 revolution per hour to keep the gas stove with good ventilation performance.
8. Operate strictly in accordance with the ignition procedure of the gas producer and the ignition procedure of the heating furnace.
hydrogen protection bright annealing furnace
9. There should be no open flames and high-temperature substances near the ammonia decomposition generating device and purification device.
10. Ammonia bottle cooling water tank, the water level is not less than 1.2 meters
11, ammonia decomposition pure gas flowmeter <15m3/h.
12. Ammonia decomposition pressure gauge ≤0.1Mpa.
13. Ammonia decomposition inlet pressure gauge ≤0.04Mpa.
14. Ammonia decomposition regeneration flow meter is less than 0.35m3/h.
15. The normal gas supply time of the adsorption tower is 72 hours.
16. Replace the ammonia and oxygen hoses on the ammonia decomposition machine regularly.
17. When the ammonia decomposition machine group I and group II are used interchangeably, 50 minutes of gas must be rushed.
18. The ammonia decomposition generating device and the gas purifying device are malfunctioning, and the normal gas supply cannot be guaranteed. The ammonia inlet valve should be closed, the ammonia decomposition gas outlet valve should be closed, the vent valve should be opened, and the safety nitrogen valve should be opened immediately, and the inner cover should be opened immediately The mixed gas of nitrogen and hydrogen is exhausted and heating is stopped.
19. Stop the ammonia decomposition machine and operate strictly according to the regulations.
20. When hoisting the heating furnace body and cooling cover, the power supply should be cut off, and live operation is strictly prohibited. When hoisting the inner tank and cooling cover, pay attention to turning on the cooling water switch.
21. Frequently check the water level in the riot box to keep it stable, and it is strictly forbidden to cause accidents when the air is backflowed due to too low or no water.
22. Always check whether the sealing rubber ring on the furnace seat is in good condition. When the inner tank is fastened, the opposite bolts must be tightened to prevent flattening and air leakage.
23. Before vacuuming, close the ammonia decomposition inlet valve of the furnace base, close the exhaust valve of the furnace base, and open the vacuum valve of the furnace.
24. The ignition color of the exhaust gas of the riot box is orange.
25. The furnace base fan is not allowed to start at high speed directly, it should be low speed and then high speed to ensure the service life of the motor.
26. During the burning process, the gas generator operator and the heating furnace operator cooperate and operate synchronously, and operate in strict accordance with the operating process requirements.
