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Home Environmental Combustion of wood waste in the boiler with underfeed retort

Combustion of wood waste in the boiler with underfeed retort


World experience shows that 1 MWth wood fired boilers with furnaces equipped with underfeed retorts are widely applied. Such boilers are characterized by moderate investments and low labor-intensiveness for operation and maintenance. The retort furnaces work stably while using wood chips or saw dust with moisture content up to 35 % by mass and low ash content. When supplying fuel with higher moisture content the combustion becomes unstable and ecological indexes of boiler operation take a turn for the worse. Increased content of ash or contamination of fuel by soil causes slagging and other problems during combustion.

To resolve this problem the Institute of Engineering Thermophysics has developed an improved technology for the combustion of wood waste in a boiler with furnace equipped with underfeed retort.

The main parameters of boiler operation:

  • efficiency 83.2%,
  • emission of CO and NOx 250-300 ppm under excess air factor 1.4…1.5.

In addition to wood chips the boiler can use saw dust, chaffed straw and peat as a fuel.

Innovative Aspect and Main Advantages

In comparison with other underfeed boilers the developed technology has a number of advantages. The boiler is of better design and that allows to combust fuel with moisture content up to 50-55%. The retort has extended zone for complete burning of coke-ash rest on grate. It is its principal difference from ordinary retorts. Extended zone for after burning gives the possibility to use fuel with high ash content and contaminated with mineral additives. Design of the furnace with moderate cooling allows keeping temperature at a level which is enough for combustion of wood waste with 50-55% moisture content.

Fuel is supplied to the boiler by a screw feeder. The feeder has original design that results in avoiding its blockage by fuel.

Areas of Application

The boiler can be used in district heating systems and also at enterprises of timber and wood processing industry for heating and process heat supply

General view of a 100 kW experimental boiler
Fig. 1 General view of a 100 kW experimental boiler

Stage of Development

A 100 kW experimental boiler has been constructed and investigated in the laboratory. Detail design and design documentation is available. The boiler can be easily scaled up to 1 MW.

Contact Details

Contact person: Dr. Geletukha Georgiy
Institute of Engineering Thermophysics, NAS of Ukraine
Address: 2A, Zhelyabov street, 03057, Kyiv, Ukraine
Tel./fax: (+380 44) 456-9462
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it


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