SRT

Step grate combustion 850 to 10,000 kW

The step grate com­bu­tion is par­tic­u­lar­ly suit­able for the com­bus­tion of wood fuels with a high water con­tent of up to 60 % and an ash con­tent of up to 10 %. These con­di­tions allow the flex­i­ble use of inex­pen­sive, not pre-dried fuels such as green cut, bark, wood from land­scape cul­ti­va­tion and waste wood. The wood com­bus­tion sys­tem SRT with step grate is designed for con­tin­u­ous oper­a­tion of up to 8,000 hours per year.

Designed for continuous operation

Fuels:
Wood from land­scape cul­ti­va­tion
bark
green cut
waste wood
short rota­tion wood
spe­cial fuels

The SRT is par­tic­u­lar­ly suit­able for the com­bus­tion of wood fuels with a high water and ash con­tent. These require­ments enable flex­i­ble use of afford­able, not pre-dried fuels.

Flue gas recir­cu­la­tion »over« and »below« grate

The flue gas is sucked in the exhaust pipe and fed via a fan of the com­bus­tion cham­ber »over« or »below« the grate again. This caus­es a reduc­tion of the flame tem­per­a­ture and a reduc­tion of nitro­gen oxides. The effi­cien­cy of the sys­tem is increased because a low­er resid­ual oxy­gen con­tent in the exhaust gas can be used even with dry fuels. In flue gas recir­cu­la­tion »below« grate, the recir­cu­lat­ed exhaust gas is mixed in mix­ing cham­bers with pri­ma­ry air and fed back under the grate. The flue gas recir­cu­la­tion »below« grate also improves burnout and pre­vents slag­ging on the grate.

Low­est life cycle costs

We attach great impor­tance to dura­bil­i­ty and a long ser­vice life of the sys­tem. That‘s why we rely on a robust sys­tem tech­nol­o­gy. Sol­id steel con­struc­tion and the use of high-qual­i­ty lin­ing mate­r­i­al guar­an­tee reli­able plant avail­abil­i­ty over many years. Low­est pow­er con­sump­tion in all load con­di­tions of the plant is guar­an­teed by fre­quen­cy-con­trolled screws, grate dri­ves and exhaust gas recir­cu­la­tion.

Design and accessories

TYPE POWER RANGE*
850 170 to 850 kW
1100 220 to 1,100 kW
1400 280 to 1,400 kW
1700 340 to 1,700 kW
2100 420 to 2,100 kW
2600 520 to 2,600 kW
3300 660 to 3,300 kW
4200 840 to 4,200 kW
5200 1,040 to 5,200 kW
6500 1,300 to 6,500 kW
8000 1,600 to 8,000 kW
10000 2,000 to 10,000 kW

*depends on fuel and water con­tent

MAWERA-SRT-finzelberg

Design and performance — SRT

Mod­el 850 1100 1400 1700 2100 2600 3300 4200 5200 6500 8000 10000
Rat­ed heat­ing out­put 850 1,100 1,400 1,700 2,100 2,600 3,300 4,200 5,200 6,500 8,000 10,000 kW
Dimen­sions SE
Length 4,910 4,910 5,223 5,223 5,898 5,898 6,573 6,573 7,573 7,573 8,853 9,813 mm
Width 2,100 2,100 2,100 2,300 2,300 2,600 2,850 2,860 2,880 3,600 3,700 4,200 mm
Height 5,475 5,475 5,927 6,127 7,200 7,200 8,235 7,725 9,085 9,825 10,422 11,206 mm
Dimen­sions ESH
Length 5,272 5,272 5,590 5,590 6,431 6,431 6,724 6,724 7,721 7,721 9,001 9,961 mm
Width 2,100 2,100 2,100 2,300 2,300 2,600 2,850 2,860 2,880 3,600 3,700 4,200 mm
Height 5,475 5,475 5,927 6,127 7,200 7,200 8,235 7,726 9,085 9,825 10,422 11,206 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*		 6 or 10*
or 16*		 6 or 10*
or 16*		 6 or 10*
or 16*		 bar (ü)

*on request
SE = Screw feed
ESH = Feed neck

SRT

Step grate com­bus­tion 850 — 10,000 kW

Design and accessories

MAWERA-Feuerung-SRT

Equipment and accessories

Measurements of primary and recirculated air

In order to ensure opti­mal com­bus­tion results and emis­sion val­ues in all load lev­els, even with dif­fi­cult fuels, the vol­ume flows of the pri­ma­ry air and flue gas recir­cu­la­tion are mea­sured and the required air quan­ti­ties are cal­cu­lat­ed in advance. The grate of the SRT is divid­ed into four inde­pen­dent pri­ma­ry air zones. As a result, the required air vol­umes can be adapt­ed to the fuel.

Use of high quality O2 -probes

The sec­ondary air vol­ume flow is reg­u­lat­ed to the actu­al oxy­gen val­ue. Through the use of high qual­i­ty O2 probes a con­stant low resid­ual oxy­gen con­tent in the exhaust gas is pos­si­ble (about 4–5 % O2 (moist) – depend­ing on the fuel). As a result, high­est effi­cien­cies are achieved even in mod­u­lat­ing part-load oper­a­tion.

Automatic ash removal

Depend­ing on fuel and ash con­tent, var­i­ous vari­ants are avail­able for the ash removal of the com­bus­tion cham­ber as well as cyclone and the elec­tro­sta­t­ic pre­cip­i­ta­tor. The ash can be dis­charged togeth­er or sep­a­rate­ly. The removal is car­ried out in con­tain­ers up to 800 l or in skips of 5.5 to 12 m2. In addi­tion, the ash removal is also pos­si­ble in big bags.

The fol­low­ing vari­ants are avail­able:

  • With chain con­vey­ors
  • With screws
  • Lat­er­al­ly from the com­bus­tion cham­ber
  • Direct­ly below the com­bus­tion cham­ber

Take advantage of these benefits:

  • Ful­ly auto­mat­ic bio­mass com­bus­tion sys­tem with step grate 850 to 10,000 kW
  • Water con­tent in fuel: 6 to 60 %, ash con­tent (for­eign parts) up to 10 %
  • Step grate com­bus­tion tech­nol­o­gy with up to four inde­pen­dent pri­ma­ry air and hydrauli­cal­ly dri­ven grate zones
  • Low pow­er con­sump­tion is achieved in all of the system‘s load ranges through the use of fre­quen­cy-con­trolled screw con­vey­ors, grate dri­ves and fans such as flue gas, sec­ondary air and recir­cu­la­tion fans
  • Low flow veloc­i­ties over the fuel bed pre­vent tur­bu­lence and ensure low-emis­sion com­bus­tion in all load con­di­tions
  • The opti­mized and gen­er­ous­ly dimen­sioned fire­box geom­e­try guar­an­tees reduced stress on com­po­nents and the refrac­to­ry lin­ing. As a result, the com­bus­tion sys­tem is rec­om­mend­ed for con­tin­u­ous oper­a­tion of up to 8,000 hours

Optional accessories:

  • Pneu­mat­ic boil­er clean­ing sys­tem (con­sid­er­ably increas­es the time between clean­ing inter­vals)
  • Auto­mat­ic igni­tion sys­tem (auto­mat­ic igni­tion for fuels up to a water con­tent of 35 %)
  • Remote main­te­nance and visu­al­iza­tion sys­tems (full sys­tem access from PC, tablet or mobile phone)
  • Exhaust gas tem­per­a­ture increase (to avoid con­den­sa­tion in exhaust gas pipes and down­stream com­po­nents)
  • Den­i­tri­fi­ca­tion sys­tem (to reduce NOX emis­sions using the SNCR method)
  • Con­tin­u­ous emis­sion mea­sure­ment
  • LUVO (pre­heat­ing of pri­ma­ry air for wet fuels)
  • Fur­nace cam­era for mon­i­tor­ing the fire­box as an opti­mal sup­ple­ment to a visu­al­iza­tion sys­tem

Ques­tions?

SRT

step grate com­bus­tion 850 — 10,000 kW

Example:
Process steam for industry

Com­bus­tion: SRT
Out­put: 8,000 kW
Fuel: Wood from land­scape cul­ti­va­tion M55, A10

MAWERA-SRT-anlage
  1. Fuel stor­age with mov­ing floor
  2. Fuel trans­port: Trough chain con­vey­or and hydraulic feed­er
  3. Com­bus­tion sys­tem: SRT
  4. Hot water econ­o­miz­er 
  5. Spark arrester
  6. Fab­ric fil­ter
  7. Con­den­sa­tion sys­tem incl. econ­o­miz­er
  8. Flue tube con­nec­tion
  9. Recir­cu­la­tion
  10. Chim­ney

Application areas SRT:

Wood­work­ing indus­try

Wood pro­cess­ing indus­try

Indus­try

Local and dis­trict heat­ing

Munic­i­pal and pub­lic prop­er­ty

Installation of a step grate combustion with 8,000 kW

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Installation of a step grate combustion with 8,500 kW

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