For farmers, rural businesses and local
communities looking for cost-effective heating systems,
straw-fired biomass boilers offer significant advantages.
Straw is thermally efficient, and cheaper than all fossil
fuels and other forms of biomass. It is readily available
as a by-product of agriculture and requires minimal processing
to be used as a fuel.
MetalERG has manufactured straw-fired boilers since 1993,
refining its designs in response to customer demand. Its
latest model, Bio-Eco-Matic, offers greater automation
at every stage to further enhance both ease of use and
These are low-temperature boilers, designed to work in
an open system with a storage tank. The boilers have the
biomass combustion (gasification) chamber, afterburner
and a tube type heat exchanger.
The EKOPAL RM boiler is fitted with a high pressure fan
with an air damper adjusted automatically and microprocessor-based
control system, which controls the biomass combustion
process according to optimal parameters.
Container Mounted Boilers Fired with Straw & Other
There is also the possibility to execute the EKOPAL RM
boilers as container-mounted. No need to build an additional
boiler room is an undoubted advantage of this solution.
The appliance is free-standing and does not require permanent
bonding with the base.
Air Heaters Fired with Straw & Other Biomass
Based on the straw-filled boilers, MetalERG has developed
the design of a range of air heaters, which can heat air
to 120 degrees Centigrade. The straw burning system is
the same as in EKOPAL RM boilers, i.e. the countercurrent
system. The range of air heaters includes 6 sizes of heaters
with power from 1000 kW to 1000 kW, adapted to all kinds
of bales of straw starting from the smallest cubes with
dimensions of 80x40x40 cm through the round bales with
a diameter of 120-810 cm, up to high density cuboids with
dimensions of 250x120x80 cm.
Bio-Eco-Matic is the first fully automatic straw-fired
batch boiler. The use of the system for automatic loading
of the whole bales of straw along with a feeding chamber
which is also a filter and dryer allows for significant
improvement of the straw combustion process, which results
in time and financial savings for the final customers.
It can be additionally fitted with an automatic ash removal
system and heat-exchanger cleaning system to maximize
the easiness of service. Bio-Eco-Matic was optimized in
terms of both efficiency and low emissions. With the outputs
from 500 KW to 2 MW it is an excellent solution for large
agricultural farms, rural communities, as well as companies
located in rural areas.
The basic and easiest dust removal system used by MetalERG.
This "collecting chamber" removed the largest
fraction of particulate matter in the exhaust gas. It
operated on a principle of a cyclone (centrifugal force),
which causes the greater solids in the exhaust gas to
be separated and fall to the ash reservoir and dedusted
exhaust gas is directed to the stack. The efficiency is
about 40% in the range of the largest fraction of particulate
An extended, more advanced version of the collecting
chamber. The system operates similarly to the collecting
chamber using a centrifugal force. The device consists
of a set of small collecting chambers, where the flowing
exhaust gas reaches high peripheral speeds. Because the
dimensions of individual "cyclones" are small,
the system creates several or more small "cyclones."
This design allows the achievement of much higher efficiency
(up to 70%) and a much wider range of dust PM10 and PM2.5.
This design causes that only clean (free of dust) exhaust
gases are sucked in through the stack and the dust falls
into the dust chamber.
Electric precipitator is a kind of dust collector where
dust removal from the flue gas occurs with the help of
electrostatic forces acting on the particles of gas. Voltage
usually used is at 30-80kV, which is very effective. In
our system we use a dual exhaust gas cleaning system,
thereby obtaining an overall efficiency of over 90%.