W-grate (BS) Mark 5 air-cooled - the result of 30 years of development
What is a combustion grate?
A combustion grate is a transport device with reciprocating movement transporting burning fuel from inlet through the furnace to the bottom ash outlet.
During transport the fuel is mixed and combustion air is added.
Volatile material is released to the furnace and fixed carbon is burned on the grate.
The BS Mark 5 - a result of 30 years of development
The Mark 5 version is the result of 30 years of development. Very high combustion efficiency is obtained with greater energy recovery for the production of electricity and/or heat while limiting environmental pollution.
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Application:
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Features:
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- Combustion of all types of waste
- Steam, hot water and district heating
- Capacity: 3 - 30 t/h
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- High thermal efficiency
- Can handle unsorted waste
- Low total organic carbon in ash content
- Possibility of biomass co-firing
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Our proven air-cooled w-grate, the BS Mark 5, is ideal for combustion of refuse
Apart from the obvious process advantages, the Mark 5 offers full integration with the BWV water-cooled Mark 6 BS w-grate providing Babcock & Wilcox Vølund clients with complete freedom in the area of grates, whether it is air-cooled, water-cooled, or both.
Process advantages of the air-cooled w-grate, BS Mark 5:
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- Air gap of 1.5-1.8% of the projected area, giving uniform air distribution through individual grate sections. Fuel can be heavy, light or heterogeneous, such as household or non-hazardous trade and industrial waste.
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- Agitation of the waste fuel, giving efficient combustion and ensuring very low CO emission.
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- Minimal unburnt organic compounds in combustion gases.
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- Slow and continuous grate movement, giving small quantities of dust and fly ash.
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- The grate is operated close to substoichiometric conditions, giving low bed temperature and thus minimising bottom ash melting and caking. The result is a high degree of burnout and fine-grained bottom ash.
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- Excellent primary air distribution, minimising excess air and giving reduced quantities of combustion gases.
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- Uniform and steady combustion results in uniform energy production and an almost constant combustion gas flow.
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Mechanical advantages of the air-cooled w-grate, BS Mark 5:
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- No physical contact between moving grate parts, thus limiting wear and reducing the mechanical forces to which the grate is exposed during operation.
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- Air-cooled side plates secure their durability. Thermal grate expansion does not affect gaps between outer grate bar and side plate.
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- Driving mechanism situated outside the furnace prevents grate siftings, molten tin, aluminum, etc. from fouling and blocking the system. Easy access for maintenance.
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- Adjustment and lubrication can be carried out from outside the furnace.
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