I. Main technical parameters of regenerative combustion system
1, aluminum smelting furnace uses: aluminum ingot, recycling aluminum waste smelting, heat preservation and alloy composition adjustment
2, the furnace specification: rectangular or circular aluminum melting furnace, capacity of 10 tons +5%
3. Fuel: natural gas or oil
4. Pressure in front of fuel furnace: pressure in front of furnace 8 ~ 12kPa; The usual pressure is 10kPa
5. Feeding mode: manual or forklift feeding in batches from the furnace door
6. Working temperature of furnace: normal working temperature ≤1150ºC, maximum working temperature 1200ºC
7, liquid aluminum oven temperature: normal oven temperature 680 ~ 720ºC, the highest 750ºC
8, melting period melting rate: 2 ~ 4t/h (varies according to the type of raw materials)
9, burner type and number: upper type regenerative double flame burner, one pair of two with 4 sets of main burner
10. Burner installation position: centered on the side wall of aluminum smelting furnace (or symmetrical installation on both sides of the furnace door)
11, heat storage body material: diameter 25mm to 50mm high aluminum solid ceramic heat storage ball
12, burner maximum combustion capacity: 2000kW, maximum energy consumption 220m3/h natural gas, firepower regulation depends on the gas electric regulating valve opening double gas solenoid valve combination switch, to realize the automatic operation of fire, fire and small fire.
13, air preheating temperature: less than 1000ºC flue gas emission temperature: less than 180ºC
14, temperature measurement mode: furnace temperature and exhaust temperature automatic measurement, liquid aluminum temperature manual measurement
15, temperature control form: PLC automatic control furnace temperature and exhaust temperature, display and record
16, furnace pressure control mode: rely on induced draft fan frequency conversion regulation of flue gas flow, micro positive pressure automatic control of furnace pressure
17, heat load regulation mode: according to the set air-fuel ratio parameters, automatic control of gas flow and combustion air flow of each gear, to achieve automatic regulation and control of heat load.
18. Control idea of air-fuel ratio: First of all, according to the process needs, independent selection of fire, medium fire, small fire (melting file, temperature file, heat preservation file), automatic control of electric gas regulating valve opening double gas solenoid valve combination switch, real-time monitoring of gas flow and combustion air flow, according to the set air-fuel ratio parameters, automatic control of blower and induced draft fan optimal operating frequency, Automatically match the gas flow at the corresponding gear, truly realize the automatic control operation of air-fuel ratio, and effectively avoid the influence of heat storage ball blockage and naked eye judgment error on flame regulation.
19. Gas flow regulation mode: The gas flow of the whole system is operated by electric regulating valve and double gas solenoid valve combination switch, and the gas flow value (firepower) of three gears is set in advance.
20, combustion fan and flow regulation: high pressure fan model 9-19-5.6A, air volume 2600m3/h, motor power 11kW. The combustion air flow is monitored by air flowmeter in real time, and the frequency converter is adjusted automatically.
21. Induced draft fan and flow regulation: High pressure fan model 9-19-6.3D, air volume 3200m3/h, motor power 18.5kW. The gas discharge flow rate is automatically adjusted by frequency converter to keep the furnace pressure stable.
22, compressed air consumption: 0.3m3/min, 0.6 ~ 0.8MPa
23. Installed capacity of power supply: 380/50Hz/3 phase total 30kW
24, energy consumption index: ensure energy saving more than 30% than ordinary combustion system, melting furnace per ton of aluminum energy consumption less than 500,000 kcal/ton aluminum (the total energy consumption of all aluminum ingot melted to 660ºC aluminum water is not higher than 46m3 natural gas per ton aluminum ingot), better than the national special furnace energy standards. Or the energy consumption of 70% clean bulk waste +30% aluminum ingot melting to 660ºC aluminum water is not higher than 52m3 per ton of raw gas, and the energy consumption of melting to 720ºC aluminum water is not higher than 57m3 per ton of raw gas.
25, energy consumption testing standards: according to the "JBT-50168-1999 aluminum melting Fuel furnace energy consumption grade" standard implementation.
26. Safety protection measures: Outage and automatic recovery of furnace temperature exceeding the standard, forced reversing and outage alarm of smoke exhaust temperature exceeding the standard, interlocking of furnace door switch and combustion system, automatic flame monitoring flares out and false alarm protection, automatic protection of ignition air, combustion air, compressed air blocking under pressure leakage, automatic outage of furnace pressure exceeding the standard, automatic monitoring and protection of reversing valve in place, inverter failure by-pass power frequency operation, fan Shutdown self-locking system, etc., to ensure safe operation of equipment.
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