Boiling Hot Air Furnace Series

Applications:

Iron and steel metallurgy industry: pellet drying, vertical slag grinding, coal grinding, iron concentrate drying, manganese ore, zinc leaching residue, lump ore, pyrite, laterite nickel ore, lithium ore, mica ore, lead-zinc ore, tailings, siderite, etc.;

Cement industry: slag micro-powder, coal grinding, raw meal grinding, ball grinding, V powder selection grinding system, clay drying, yellow sand, dry-mixed mortar, slag drying, iron powder drying, building gypsum drying, etc.;

Chemical industry: phosphogypsum, carbon material drying, desulfurization gypsum, lignite drying, white carbon black, titanium dioxide, perlite, compound fertilizer, carbide slag, quartz sand, coal slime, pulverized coal preparation, kaolin, etc.;

Ceramic industry: spray drying towers, etc.;

Solid waste: sludge, tailings, carbide slag, phosphogypsum, limestone powder, fly ash, volcanic ash, etc.;

Working Principle:

Fuel crushed to below 10 mm is evenly fed onto the air distribution plate of the furnace by a controlled mechanical system. A controlled blower injects pressurized air through the air caps on the distribution plate into the furnace, lifting the granular fuel and charge to achieve "fluidized" combustion. Continuous collisions and cracking of the fuel further deepen combustion until complete burnout. Fuels with high ash content and low calorific value, which cannot be burned in conventional furnaces, can achieve stable combustion and high burnout rates in a fluidized bed furnace.

Main Performance and Features:

★ Full combustion, high efficiency, coal saving; burnout rate up to 98% or more, thermal efficiency up to 95%;

★ Capable of burning various solid fuels with low calorific value greater than 1500 KCAL/KG, such as bituminous coal, anthracite, lignite, coal gangue, oil shale, and biomass fuels;

★ Environmentally friendly, limestone can be used for desulfurization inside the furnace, allowing sulfur in coal to be discharged in solid form with slag; low NOX content in flue gas, minimal harmful gas emissions;

★ Flue gas temperature is stably adjustable within the range of 100°C–900°C according to different process requirements, with small fluctuations in heat supply temperature;

★ Easy ignition, capable of banking fire; banking time up to 48 hours; no need to reignite after restarting from banking;

★ High degree of mechanization, simple operation, intelligent thermal control design; long service life, few vulnerable parts, easy maintenance;

★ Large fluidized bed furnace (dual foundation plane): The furnace is built on different foundation planes, reducing the relative height of the furnace body, increasing strength and stability, with low maintenance costs; three-sided operation doors make stoking easier and more convenient;

★ Large fluidized bed furnace (reinforced concrete structure): Stable structure, long service life, short construction period, simple foundation, aesthetically pleasing appearance;

★ Fluidized bed furnace (low-nitrogen vortex environmentally friendly fluidized bed): Low nitrogen oxide generation, higher combustion efficiency, short construction period, dust-free and waste-free construction, good environmental protection, small footprint;

★ Fluidized bed furnace (explosion-proof series): Multi-stage gas-solid separation inside the furnace, low fly ash, no open flame; flue gas outlet temperature controlled at 200–300°C, below ignition point; especially suitable for drying processes involving flammable and explosive materials;

★ Fluidized bed furnace (low fly ash series): Uses repeated circulation burnout technology, allowing unburned pulverized coal in fly ash to be reburned, achieving a burnout rate of over 98%; optimized air distribution system with large pitch variable aperture air caps ensures good fluidization quality and combustion effect; good fuel adaptability, comprehensive utilization of ash and slag, ash and slag not subjected to high-temperature melting, good activity, carbon content less than 1%;

★ FR series fluidized bed furnace has a heat supply capacity 20% higher than the rated value, with multiple protections, safe and reliable;

Fluidized Bed Furnace Selection Parameter Table:

Desulfurization System:

Compared to other coal-fired hot air furnaces, fluidized bed furnaces are easier to desulfurize and offer significant environmental advantages. When burning low-quality high-sulfur coal, limestone is used for sulfur fixation, allowing sulfur in the fuel to be discharged in solid form, reducing SOx pollution. Dry desulfurization in fluidized bed furnaces features low investment, small footprint, low operating costs, simple equipment, and easy maintenance.

Our company designs and produces fluidized bed furnace desulfurization systems as independent systems, scientifically and reasonably configured without affecting the coal supply system. Backup can be reserved, and desulfurization effectiveness is better than mixing coal with desulfurizing agents. Dry fluidized bed flue gas desulfurization is particularly suitable for coal with low sulfur content, offering an economical and effective flue gas desulfurization technology.

Denitrification System:

SNCR, or Selective Non-Catalytic Reduction denitrification technology, involves directly injecting amino-containing reducing agents (such as ammonia water, urea solution, etc.) into high-temperature flue gas at 850–1100°C without using a catalyst. Under high-temperature conditions, the reducing agent decomposes into NH3 and other by-products. Then, NOx in the flue gas further undergoes redox reactions with the decomposed NH3, reducing and removing NOx from the flue gas to produce nitrogen and water, achieving clean denitrification.

Effect: NOx emission concentration: ≤50mg/Nm³; denitrification efficiency: 60%; ammonia escape rate: ≤8ppm

Thermal Control System:

Normal operation keeps furnace temperature, flue gas outlet temperature, and exhaust gas temperature within a certain range to ensure stable heat supply. For different process scenarios, measurement and control parameters vary. According to DCS system requirements, communication channels with the host computer are designed. The PLC outputs required analog 4–20mA signals, switch status signals, and receives switch operation signals from the PLC, which then exchanges information with the host computer via its bus.

Electrical Flowchart:

System Measurement and Control Process Parameters:

Site Photos:

Customer Reviews: