VFE

Injection combustion 850 to 5,200 kW

The very dry and pul­verised fuel is blown into the ful­ly fire­clay-lined, high-qual­i­ty insu­lat­ed com­bus­tion cham­ber via one or more injec­tion pipes. The injec­tion with a spe­cial­ly devel­oped com­bus­tion cham­ber geom­e­try ensures opti­mum burnout of the fuel as well as the required tur­bu­lence and flow con­di­tions.

MAWERA-Feuerung-VFE

The specialist for the wood industry

Fuels:

Dusty, very dry fuels from indus­tri­al
wood pro­cess­ing

Blow-in fir­ing with high-tem­per­a­ture air com­bus­tion for the ener­getic util­i­sa­tion of pul­verised wood residues from wood pro­cess­ing.

Injec­tion com­bus­tion

The very dry and pul­verised fuel is blown into the ful­ly fire­clay-lined, high-qual­i­ty insu­lat­ed com­bus­tion cham­ber via one or more injec­tion pipes. The injec­tion with a spe­cial­ly devel­oped com­bus­tion cham­ber geom­e­try ensures opti­mum burnout of the fuel as well as the required tur­bu­lence and flow con­di­tions.

The fuel is blown in accord­ing to the injec­tor prin­ci­ple. This means that no fuel enters the injec­tion fan and there­fore no wear occurs on the fan due to the fuel.

The heat stor­age in the fire­clay mass ensures the cor­re­spond­ing­ly high com­bus­tion cham­ber tem­per­a­tures, which guar­an­tee very low emis­sion val­ues. The hor­i­zon­tal 3‑pass flame tube smoke tube boil­er is installed on the com­bus­tion cham­ber as a warm or hot water boil­er. Steam boil­ers or ther­mal oil boil­ers can also be sup­plied as required.

Designed for the wood indus­try

The VFE has been spe­cial­ly devel­oped for indus­tri­al wood pro­cess­ing. Even fuels such as MDF or chip­board residues pose no prob­lem for the fir­ing sys­tem.

The low-NOX com­bus­tion cham­ber is designed with mea­sures on the pri­ma­ry side, such as air stag­ing to reduce NOX emis­sions. The reg­u­la­tion of the pri­ma­ry air sup­ply in com­bi­na­tion with flue gas recir­cu­la­tion ensures sub-sto­i­chio­met­ric com­bus­tion in the reduc­tion zone.

The sec­ondary air is sup­plied down­stream of the com­bus­tion chamber‘s reduc­tion zone. The cor­re­spond­ing com­bus­tion cham­ber geom­e­try in com­bi­na­tion with the com­bus­tion air sup­ply ensures high tur­bu­lence and mix­ing with the flue gas and thus opti­mum oxi­da­tion (CO burnout) of the com­bus­tion gas­es.

Design and accessories

TYPE POWER RANGE*
850 510 to 850 kW
1100 660 to 1,100 kW
1400 420 to 1,400 kW
1700 510 to 1,700 kW
2100 630 to 2,100 kW
2600 780 to 2,600 kW
3300 990 to 3,300 kW
4200 1,260 to 4,200 kW
5200 1,560 to 5,200 kW

*depends on fuel and water con­tent

MAWERA-Feuerung-VFE

Design and performance — VFE

Mod­el 850 1100 1400 1700 2100 2600 3300 4200** 5200**
Rat­ed heat­ing out­put 850 1,100 1,400 1,700 2,100 2,600 3,300 4,200 5,200 kw
Dimen­sions EBL
Length 4,900 5,200 5,800 5,800 6,150 6,150 7,000 4,006 4,960 mm
Width 2,000 2,050 2,100 2,300 2,300 5,600 2,850 2,326 2,880 mm
Height 4,480 4,710 4,950 5,050 6,120 6,120 6,750 6,900 7,700 mm
Max. oper­at­ing pres­sure 6 or 10*
or 16*		 6 or 10*
or 16*		 6 or 10*
or 16*		 6 or 10*
or 16*		 6 or 10*
or 16*		 6 or 10*
or 16*		 6 or 10*
or 16*		 6 or 10*
or 16*		 6 or 10*
or 16*		 bar (ü)

*on request  |  **Boil­er with water wall  |  EBL = Injec­tion com­bus­tion

VFE

Injec­tion com­bus­tion 850 — 5,200 kW

Design and accessories

MAWERA-Feuerung-VFE

Equipment and accessories

Flue gas re-circulation

The exhaust gas is extract­ed in the exhaust pipe and fed back into the com­bus­tion cham­ber via a fan. This caus­es a reduc­tion in the flame tem­per­a­ture and a reduc­tion in nitro­gen oxides. The effi­cien­cy of the sys­tem is increased, as a low resid­ual oxy­gen con­tent in the flue gas can be achieved even with dry fuels.

Measurements of the primary and recirculation air

The vol­ume flows of the pri­ma­ry and recir­cu­la­tion air are mea­sured and the required air vol­umes are cal­cu­lat­ed in advance. This enables opti­mum com­bus­tion results and emis­sion val­ues to be achieved at all load lev­els, even with dif­fi­cult fuels.

Use of high-quality O2 probes

The sec­ondary air vol­ume flow is reg­u­lat­ed to the actu­al oxy­gen val­ue. The use of high-qual­i­ty O2 probes enables a con­stant­ly low resid­ual oxy­gen con­tent in the flue gas (approx. 5–6 % O2 (wet) — depend­ing on the fuel). This enables max­i­mum effi­cien­cy to be achieved even in mod­u­lat­ing par­tial load oper­a­tion.

Ash removal

Very lit­tle ash is pro­duced in the com­bus­tion cham­ber as a result of the air com­bus­tion. Ash is removed from the com­bus­tion cham­ber man­u­al­ly or auto­mat­i­cal­ly via a water-cooled screw.

Take advantage of these benefits:

  • Ful­ly auto­mat­ic bio­mass com­bus­tion sys­tem with injec­tion fir­ing 850 to 5,200 kW
  • Water con­tent in the fuel: 6 to 15 %, ash con­tent (for­eign mat­ter) up to 2 % (4 % with sta­tion­ary com­bus­tion cham­ber)
  • Mod­u­lat­ing load con­trol from 55 to 100 % while main­tain­ing the emis­sion val­ues
  • Stop-and-go oper­a­tion: If the pow­er require­ment of the sys­tem falls below the min­i­mum out­put, the sys­tem switch­es off auto­mat­i­cal­ly and goes into stand-by mode. If the flow tem­per­a­ture falls below the set­point tem­per­a­ture and the pow­er require­ment is thus renewed, the sys­tem is restart­ed. If the fir­ing sys­tem is shut down for a longer peri­od, the auto­mat­ic pilot burn­er moves into the com­bus­tion cham­ber and heats the com­bus­tion cham­ber back up to the required tem­per­a­ture for the fuel sup­ply

Optional accessories:

  • Pneu­mat­ic boil­er clean­ing sys­tem (sig­nif­i­cant­ly extends the time between clean­ing process­es)
  • Auto­mat­ic igni­tion device
  • Option­al two injec­tion noz­zles for mod­u­lat­ing load con­trol up to 35 % (from 1,700 kW)
  • Remote main­te­nance and visu­al­i­sa­tion sys­tems (full sys­tem access from PC, tablet or mobile phone)
  • Flue gas tem­per­a­ture increase (to pre­vent con­den­sa­tion in the flue gas path and in down­stream com­po­nents)
  • Den­i­tri­fi­ca­tion sys­tem (to reduce NOX emis­sions using the SNCR process)
  • Con­tin­u­ous emis­sion mea­sure­ment

Ques­tions?

VFE

Injec­tion com­bus­tion 850 — 5,200 kW

Example:
Furniture industry (profiles and panelling)

Com­bus­tion: VFE
Out­put: 1,700 kW
Fuel: Dust and chips from pro­duc­tion

VFE-anlagenbeispiel
  1. Fuel stor­age in silo 
  2. Pneu­mat­ic fuel trans­port
  3. Com­bus­tion: VFE
  4. Auto­mat­ic igni­tion device
  5. Flue gas clean­ing Mul­ti-cyclone fil­ter incl. ash removal
  6. Puffer tank

Application areas VFE:

Wood­work­ing indus­try

Wood pro­cess­ing indus­try

Local and dis­trict heat­ing

Munic­i­pal and pub­lic prop­er­ty

Hotels and hos­pi­tal­i­ty indus­try

Plant nurs­eries

Ques­tions?