• [alt2]

Coal or Biomass Fired Hot Air Furnace

  • Thermal Power 0.12~1.4MW
  • Thermal Efficiency 70~75%
  • Fuel coal, biomass, wood, straw, etc.
  • Application textile mill, chemical industry, printing and dyeing, farm, building material factory, thermal insulation material factory, etc.
  • Certificate ISO9001, CE, BV, SGS

We're here to help:Easy ways to get the answers you need

get priceSend Email

 hot air furnace
Coal/biomass fired hot air furnace is a kind of energy saving heating equipment with simple structure, the heating principle is heat transfer. The temperature offered by the hot air furnace could reach about 300℃, has excellent drying effect. Hot air furnace could measure and display the temperature automatic, convenient for operation.

Air and flue gas flow separately for heat exchanging. Both of air and flue gas flow two passes, heat transfer area is large, high heat transfer rate, and save energy. In order to improve thermal efficiency, Sitong boiler adopts the multiple head helical groove plate heat exchanging technology and turbulent flow principle, decrease the thickness of laminar flow, to make the air and flow gas exchange heat constantly and revolve during flowing, thus, greatly strengthened the heat transfer efficiency.


The combustion chamber and heat exchanger of coal/biomass fired hot air furnace is integrated.  It uses the structure of full steel plate multi-layer sleeve, the consumption chamber is under the furnace center, the upper and around are annular heat exchanger, the furnace is two-pass structure, both air and flue gas flow two pass separately for heat exchanging.
Main Equipment
main equipment of hot air furnace

The coal/biomass fired hot air furnace is consisted of grate, refractory brick, baffle board, hot air furnace body, flue as duct and air inlet pipes, dust catcher, chimney, induced draft fan (including adjusting valve), blower fan (including adjusting valve) and dedicated temperature measuring instrument, etc.
As the flue gas and air flow separately for heat exchanging, the heated air is clean. So, hot air furnace is widely used for drying the goods that not allowed to be polluted, such as milk powder, medicine, and synthetic resin, etc.
The coal/biomass fired hot air furnace are widely used for:
1. Rotary kiln
2. Drying for chemical and medicine products  
3. Textile and printing and dyeing industry  
4. Drying for molding industry  
5. Drying for wood in architectural material industry, gypsum board and firegalss products  
6. Baking for agricultural products, fodder and food processing  
7. Supply heating project industrial factory and civil buildings and henhouse, etc 
Operation Process
operate process of hot air furnace

The coal burned in the furnace, the high temperature flue gas flow into gas channels, and exchange heat with air outside the channel, and then the flue gas flow through flue gas duct, and finally discharged into the atmosphere through chimney.
The cold air is blew into the shell of the stove by blower, and then enter the external air channel through furnace roof, after heat exchanging, the clean hot air is supplied to where needed through the air outlet tube.
High Quality Assurance

1) There is a professional design engineer team, before manufacturing, every boiler design drawing have to be approved by boiler and pressure vessel experts of CSBTS ( State Bureau of Quality Technical Supervision ), and then the boiler could be produced only if qualified.
2) To ensure the raw materials quality, all the steel plates are special-used for boiler with the Inspection Certificates. The raw material materials are inspected when entering factory, and only the qualified material could be put in storage and used for production.
3) To ensure the welding quality, there a professional welding team, including more than 30 senior welders. The welding materials are stored under constant temperature and humidity, to ensure the welding material quality.
4) The welding quality will be further examined during boiler manufacturing, by using x-ray detection, ultrasonic flaw detection, magnetic test, or penetration test, etc.
5) To ensure the boiler quality, the leakproofness and strength of pressure parts will be tested. The hydrostatic test is done to make sure there are no water drop or water mist leakage appear on steal wall or welding joint, no water leakage appear at the place of expansion, and no obvious residual deformation and abnormal situation.
6) To ensure no problems before boiler delivery, all the raw materials and boilers are supervised and inspected by the experts of Inspection Institution for Boiler and Pressure Vessel. There are international uality certificates of ISO 9001 and CE, we can also offer the inspection report of SGS, BV, etc., Quality Certificates, Energy audit report, and Energy Efficiency Test Report, etc.

Professional Installation and After-sale Service Team
1) Professional engineer installation team offer the door to door installation and after sale service. The boilers will operate smoothly and safety, and you will get them without worries.
2) 24 hours hot-line to solve your problems, and offer the professional technical supports and after sale service in time to all over the world.


Name Hot Air Outlet Temperature(C) Heating Supplied(mw) Air Volume(Nm3/h) Thermal Efficiency(%) Diameter (mm) Height (mm)
ZLRF-10 200-300 0.12 3297-2198 70 1220 2450
ZLRF-20 200-300 0.24 3847-3572 70 1500 2740
ZLRF-30 200-300 0.35 5447-3912 70 1750 3500
ZLRF-40 200-300 0.47 6445-7513 70 1840 3790
ZLRF-60 200-300 0.7 6786-7532 75 1850 4350
ZLRF-80 200-300 0.93 7813-8685 75 2100 6395
ZLRF-100 200-300 1.17 8867-9984 75 2340 6400
ZLRF-120 200-300 1.4 10556-12370 75 2500 6800
Note: 1. Parameter is for reference, if any changes should follow the actual drawing. 2. Here are parts of products, please inquire for the details.
Transaction Process
Customer Inquiry -- Offer Professional Consulting Service -- Place Order -- Customize Boiler Based on Customers’ needs --Production-manufacturing -- Payment -- Impeccable After Sale Service (installation and debugging, periodic maintenance, etc.)

Offered Technical Documentations
Installment and Operation Instruction
Quality Certificate
Inspection Certificate of Boiler quality
General Drawing of Boiler
Foundation Drawing
Boiler Body Drawing
Boiler Room Design Drawing
Drawing of Valves, Instruments and Accessories

Company Strength
Sitong boiler is a national approved and designated enterprise, with design and manufacture license permits of Class A boiler and D1, D2 pressure vessel. The company has passed ISO 9001 international quality system certification, and gained the international certificates of CE, SGS, and BV, etc. The boiler products are exported to more than 60 countries. The factory covers an area of 120 thousands㎡, equipped with plenty of international advanced manufacture equipment, such as CNC cutting machine, automatic submerged arc welding machine, X-ray detection machine, etc.
company strength of Sitong Boiler


Contact us now if you have any question about our company and products[email protected]. Any of your inquiry and suggestion will be highly appreciated. We will keep your information completely private.