Pyroflex FFU

Underfeed firing system 180 to 850 kW

The under­feed fir­ing sys­tem with dou­ble grate is spe­cial­ly suit­ed for burn­ing fuels such as scraps from wood pro­cess­ing (chip­board and MDF) and sawmill scraps. The rest­ing fire bed results in low pol­lu­tant emis­sions even with fluc­tu­at­ing and prob­lem­at­ic fuels.

Underfeed firing system FFU

State-of-the-art, highly robust firing technology

Fuels:
Log­ging and sawmill scraps
Saw shav­ings
Dust
MDF
Chip­board
Plan­ing shav­ings

Min­i­mal life cycle costs togeth­er with robust and reli­able sys­tem engi­neer­ing. MAWERA places the utmost impor­tance on dura­bil­i­ty and a long lifes­pan for our sys­tems.

Design and function

The com­plete insu­la­tion of the entire boil­er sys­tem as well as the elab­o­rate wall struc­ture of the fir­ing sys­tem guar­an­tees min­i­mal ther­mal radi­a­tion from the com­bus­tion cham­ber and high sys­tem effi­cien­cy.

The dou­ble grate design (out­er and inner grate) is opti­mised for the fuel. The fuel is ful­ly com­bust­ed by the out­er grate of the fir­ing sys­tem. The upper and low­er air flows can be reg­u­lat­ed sep­a­rate­ly. The fuel can be fed into the com­bus­tion cham­ber from the rear, right or left. The sys­tem sup­ports ful­ly mod­u­lat­ed oper­a­tion from 25 to 100%.

Robust quality

Sol­id steel con­struc­tion and the use of high-qual­i­ty refrac­to­ry mate­r­i­al guar­an­tee reli­able sys­tem avail­abil­i­ty for many years. Thanks to fre­quen­cy-con­trolled screws, dri­ves and flue gas recir­cu­la­tion, we can guar­an­tee min­i­mal pow­er con­sump­tion in all load states of the sys­tem.

Design and output ratings

Type Out­put range*
FFU 180 RIA 45 to 180 kW
FFU 220 RIA 55 to 220 kW
FFU 280 RIA 70 to 280 kW
FFU 350 RIA 87 to 350 kW
FFU 440 RIA 110 to 440 kW
FFU 550 RIA 137 to 550 kW
FFU 700 RIA 175 to 700 kW
FFU 850 RIA 212 to 850 kW

*Depend­ing on fuel and water con­tent

Pyroflex FFU

Mod­el FFU 180 RIA FFU 220 RIA FFU 280 RIA FFU 350 RIA FFU 440 RIA FFU 550 RIA FFU 700 RIA FFU 850 RIA
Rat­ed ther­mal out­put 180 220 280 350 440 550 700 850 kW
Dimen­sions
Length 2288 2288 2916 2916 2990 2990 2990 3730 mm
Width 1180 1180 1280 1280 1380 1380 1600 1700 mm
Height 2134 2134 2330 2330 2552 2763 2943 3105 mm
Oper­at­ing weight 3464 3440 5325 5275 6606 8060 9425 13192 kg
Water vol­ume 730 730 1075 1075 1546 1860 1925 3412 litres
Sectional drawing FFU
  1. 3‑pass boil­er (4.0 bar – high­er pres­sure rat­ings on request)
  2. Safe­ty heat exchang­er (inte­grat­ed into boil­er)
  3. Com­bus­tion cham­ber with fir­ing depres­sion
  4. Injec­tion of low­er air
  5. Injec­tion of upper air
  6. Injec­tion of flue gas recir­cu­la­tion (option­al)
  7. Auto­mat­ic com­bus­tion cham­ber ash removal (option­al)
  8. Fuel infeed right, left or rear
  9. Fire­box door
  10. Pneu­mat­ic boil­er clean­ing (option­al)

Profit from these benefits:

  • Min­i­mal pow­er con­sump­tion thanks to fre­quen­cy-con­trolled screws and dri­ves
  • Low pol­lu­tant emis­sions due to the rest­ing fire bed even with MDF and chip­board
  • High effi­cien­cy of up to 92%
  • 3‑pass flame tube-flue tube boil­er with flue gas tem­per­a­tures below 190 °C at full load
  • Min­i­mal oper­at­ing actions required
  • Com­plete com­bus­tion of all fuels thanks to high­ly insu­lat­ed, ful­ly ceram­ic-lined com­bus­tion cham­ber and opti­mal­ly designed com­bus­tion air injec­tion
  • Inte­grat­ed emer­gency heat exchang­er for rapid con­trol as per DIN 4751 Part 2
  • Slid­ing load reg­u­la­tion from 25 to 100% of the rat­ed heat out­put in com­pli­ance with the emis­sions val­ues

Ques­tions?

Example installation

Carpentry workshop (solid wood floors and profile boards)

Fir­ing sys­tem: Pyroflex FFU
Out­put: 440 kW
Fuel: Saw shav­ings, plan­ing shav­ings and dust mixed with chips

Anlagenbeispiel FFU
  1. Fuel stor­age in a silo
  2. Fuel dis­charge with a pen­du­lum screw
  3. Fuel trans­port with screw sys­tem
  4. Fir­ing sys­tem: Pyroflex FFU
  5. Ash removal from the com­bus­tion cham­ber into 240 l con­tain­er
  6. Coarse dust sep­a­ra­tion with mul­ti­cy­clone sep­a­ra­tor
  7. Fine dust sep­a­ra­tion with elec­tro­sta­t­ic fil­ter

Areas of application

Wood indus­try

Local and dis­trict heat­ing

Pub­lic devel­op­ers

Hos­pi­tal­i­ty

Nurs­eries