Conventional power generation is
typically about 25% efficient - that is most of the energy
generated from burning the fuel is wasted as heat lost to the
atmosphere as illustrated by the large cooling towers associated
with Power Stations. Generation of heat from boilers is a much
more efficient process with about 80% of the thermal content of
the fuel being typically converted to useful heat.
Separately, electricity and heat production are in the region of
45% efficient, together the efficiency rises to above 80% with
consequent fuel savings and reductions in harmful emissions. |
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Fuel
Carbon dioxide from the atmosphere
and water from the earth are combined in the photosynthetic
process to produce carbohydrates (sugars) that form the building
blocks of biomass. The solar energy that drives photosynthesis
is stored in the chemical bonds of the structural components of
biomass. If we burn biomass efficiently (extract the energy
stored in the chemical bonds) oxygen from the atmosphere
combines with the carbon in plants to produce carbon dioxide and
water. The process is cyclic because the carbon dioxide is then
available to produce new biomass. Biomass is a renewable
resource, but above all, it is carbon neutral, therefore not
contributing to global warming!
Although much of the focus on Combined Heat and Power in the U.K. has been focused
on electricity generation in recent years, we believe it is
important to ensure for any planned project that there is a
strong thermal requirement to ensure an efficient system.
- With the increase in Landfill Tax and the introduction
of the latest Climate Control Levy, biomass will become even
more competitive with fossil fuels.
- Biomass is a chosen growth sectors in the U.K.
- Opportunities for district heating and Combined Heat and
Power projects.
- Increased awareness of opportunities at grass roots
levels and beyond.
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Although much of the focus on
Combined Heat and Power in
the U.K. has been focused on electricity generation in recent
years, we believe it is important to ensure for any planned
project that there is a strong thermal requirement to ensure an
efficient system. Typical successful Combined Heat and Power users in the U.K. have
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- Leisure centres
- Hospitals
- Schools
- Universities
- Community centres
- District heating schemes
- Colleges
- Industrial
Energy usage often ranges from
100kW to 6mW and above, with typically, a 2:1 ratio between
thermal and electrical output. |
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Equipment
With many years of experience in
manufacturing, supplying and installing wood combustion systems,
Bioenergy Technology are able to offer wood fired boilers
ranging from domestic to Combined Heat and Power plants
including all ancillary equipment.
Bioenergy prides itself on its
ability to provide a full installation specification from
storage systems through to the chimney, and together with a
detailed knowledge of mechanical services we can offer a full
Turnkey solution.
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Storage
Bunker |
Silo |
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These are often
constructed below ground as a classic solution for
large volumes or on sites where fuel delivery
requires the facility to tip the material from a
vehicle easily. |
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This is intended for
storing dry wood chip. Available in 3m, 4m or 5m
diameter. |
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Ro-Ro bins
This is a purpose designed heavy
duty mobile steel bins with two flap end doors. Each bin fitted
with a single moving floor scraper system and hydraulic cylinder
with quick release flexible hoses and fixed pipe work. A Ro-Ro
bin can 'plug in' directly to the wood combustion system. |
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Boiler
Bioenergy Technology Limited
supplies different combustion plants, meant for all kinds of
biomass streams. Each boiler and plant is supplied to the
specific demands of the customer, the starting point is always
the basic plant as to the kilowatt output requirement.
Constant monitoring of
improvements incorporating modern designs and can include the
following equipment:
- Moving Grate technology
- Static retorts
- Pre-combustors
A 2.3mWatt wood fired steam
boiler system , which utilises a Spilling one cylinder system
steam engine generator unit , to produce approximately 170kWatts
of electricity from steam at 14bar was installed in Northern
Ireland by Bioenergy. For smaller installations of less than 1mW
, steam engines (reciprocating engines powered by steam) are
more cost effective and flexible solution to producing power
efficiently. |
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Electrical
Generation
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There are broadly two
methods of generating electricity from combustion
via steam turbines or by use of very clean (non
particulate) fuels (e.g. natural gas or diesel) via
reciprocating engines.
Bioenergy Technology
favour the use of steam turbines cycle (the Rankine
Cycle) for use of wood combustion to develop
Combined Heat and Power. This is well established
technology with a high level of reliability. It is
possible to develop gas from wood to run
reciprocating engines or gas turbines reciprocating
engines, but this technology (gasification) is
currently at an earlier stage of development and
therefore lower reliability.
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Free Standing
Chimney
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Bioenergy chimney is a
twin insulated chimney constructed generally as
detailed below:
The inner liner is
manufactured from stainless steel grade 316 0.46mm,
whilst the outer casing is stainless steel 304
0.46mm.
The insulating
material on internal diameters 125mm—200mm is a high
quality silica based powder which ensures optimum
performance.
The sockets and
spigots are manufactured from stainless steel grade
316 0.46mm, their construction having bayonet type
engagement which lock rigidly together. |
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The inner liner is lock
formed and fixed to the upper male spigot only, and
the outer casing is lock formed and is joined to
both the male spigot and female socket end caps.
This form of construction allows the inner liner to
expand and contract with the varying temperatures
without affecting the outer casing.
Bioenergy Chimney
internal diameter is from 250mm—600mm and is
constructed in the same manner as the smaller
diameters. |
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Additional
Equipment
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Dissipator |
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Bioenergy
Wood Granulator |
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Flatbed air blast
cooler, incorporating heat exchanger and axial fans
to cool the water. |
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Bioenergy has the right solution for every type of
application, all the machines are manufactured in
line with the standards of the wood processing
industry.
The basic model can be modified according to
specific requirements (e.g. desired output, hopper
shape and rotor types). |
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