annular furnace

Packaging detail: PP/PE/PVC paper water-proof wrapped with anti-rust function in wooden cases. Delivery: Within 90 days 1.annular furnace 2.Turnkey project of complete line 3.Powerful working team and technology support 4.Cooperated with Best China Metallurgical Design Institute 5.Excellent user achievement and good positive feedback 6.Very challenging project quotation 7.Lifelong after-sales & maintenance support Characteristics of our furnace: 1. Production capacity and description and technical parameters (1) Its production capacity is 80,000tons/year (for steel billet 60.32mm) based on 7200 working hours (2) Steel grade of billet: Carbon steel and alloy steel Billet diameter: 48.26mm - 114.3mm Billet length: 2000mm The tapping speed: 120 pieces/hour, the speed can be regulated. (3) Heating temperature of furnace Heating temperature for billet: 1250°C - 1280°C Temperature in the furnace hearth: 1300°C - 1350°C (4) Furnace type: Annular (5) Furnace size Middle diameter of furnace: 12000mm Inside width of furnace: 2740mm Bottom width of furnace: 2400mm Outside width of furnace: 3740mm (6) Fuel condition Fuel: Natural gas Thermal value: 8500 x 4.18 KJ/m3 Juncture pressure: <0.1MPa Burning way: straight flame Fuel supply: 1200Nm3/h at maximum, 800Nm3/h at average (7) Medium condition <1> Water It is for cooling beams, loading and unloading equipment, fan and fume discharger. Water quality: Circular water, hardness: 8-10 degree, suspension: <=20mg/L Water temperature: Inlet: 35°C Outlet: <=45°C Temperature rise: <10°C Juncture pressure: >=0.3MPa Circular water flow: 100t/h New water flow: 5t/h Water consumption: 20t/h <2> Nitrogen gas It is for cleaning tubing by blow and pneumatic equipments Juncture pressure: 0.3 – 0.4Mpa Flow: 100+30kg/h Blow duration: 30min/time <3> Power consumption It is for fan, fume discharger, loading equipment, unloading equipment, hydraulic station, circulation pump, furnace gate equipment. Voltage: 380V, AC Voltage fluctuation: ±5% Frequency: 50Hz±2% Power: 250KW 2. Furnace specification (1) Maximum fuel consumption: 1200Nm3/h Maximum air consumption: 12000Nm3/h Air preheating temperature: 350 – 450°C Maximum fume: 13200Nm3/h Thermal consumption: 1.2 – 1.5GJ/T Combustor: 30 pieces (flat flame gas nozzle) Inside seam: 65mm Outside seam: 115mm (2) General blueprint: The bottom rotation of furnace is driven by pin gear for keeping long-term, steady work. Its transmission device is equipped with 3 sets of motors <1>Production flowchart: The billets are automatically dialed onto roller path from billet table, then move to appointed position in the furnace; then, the billets rotate on the bottom of furnace. When receiving tapping signal, the heated billets are moved to outlet table and roll to roller path by tapping device. The billets are automatically moved to hot piercing mill. <2> Furnace shape It has 3 phase: preheating, heating, thermal preservation, the furnace is automatically controlled by PLC. The rotation type prevents from overheating and heavy oxidation of billet surface. <3> Mechanical loading hand work flowchart: Lay down – clamp – rise – door open – carriage forward – lay down – loosen – mechanical hand rise – carriage reverse – door close Mechanical unloading hand work flowchart: Hand rise – loosen – door open – carriage forward – lay down – clamp – hand rise – carriage reverse – door close – lay down – loosen – hand rise <4> Hydraulic station It is equipped cooling system. It is composed of oil box, main oil pump, control valve table, and others. <5> Combustion system Its function: automatic igniting, order control, voltage transformer, flame supervision, temperature adjustment, flameout alarm. Relieve valve, electromagnetic valve, global valve, pressure gauge and so on are fixed on the tubing. Electromotion butterfly valve, pressure gauge, filter, electromagnetic valve, proportion valve, safety valve, global valve is fixed before each burner. If any emergency such as sudden power off, over-low pressure natural gas, fan malfunction, the natural gas input can be swiftly stopped for keeping furnace safe. <6> Air supply system The air is fed into heating phase, thermal preservation phase by fan through tubing, heat exchanger and thermal air tubing. <7> Fume system It is composed of fume tubing, preheater and fume discharger and chimney. <8> Blow system It is for eliminating natural gas in the hearth when start and stop of furnace work. <9> Control system It is computer-control system of combustion control and mechanical control. Combustion control system It includes temperature control, pressure control, safety alarm inter-lock control. Combustion control system is equipped with programmable controller and project controller. Each variable from gauge is input to PLC, then relevant instruction and ideal value and generated by PLC and input to each executive parts for controlling temperature, pressure, flow at each juncture. 2. Turnkey project Our experienced experts will be dispatched to buyer’s site for plant construction, installation, commissioning and training workers.