SUPER TURBO RICE HUSK STOVE FOR SMALL COTTAGE INDUSTRY USE

Engr. Alexis T. Belonio
College of Agriculture - Appropriate Technology Center
Central Philippine University
Iloilo City
Good newsand glory to God!
A larger-scale super turbo rice husk stove that
injects super-heated steam into the burning
chamber was recently developed for small
cottage industry use. By injecting superheated steam into the stove’s burning
chamber, a luminous pinkish-flame, which is
rich in hydrogen gas, is obtained. While
cooking, the stove produces clean gas that is
released to the atmosphere.
This technology is another breakthrough in
biomass stove research and development of
the Appropriate Technology Center of the
Department of Agricultural Engineering and
Environmental Management, College of
Agriculture, Central Philippine University, Iloilo City. This project was
collaboratively assisted by the following agricultural engineering students of CPU
namely: Daniel Belonio, Lucio
Larano, Ian John Fabellore, Mark
Alvin Almazan, and Clark Ian
Sansolis.
As schematically shown below,
the stove consists of a conical
hopper that is made of GI sheet
no. 16 where rice husk is being
fed for burning inside the
combustion chamber, a 5 liter
capacity steam tank which boils
the water and converts it into
super-heated steam, a
combustion chamber cover
having a diameter of 30 cm that also supports the steam tank, a 2-in. diameter air
pipe which supplies the air needed for the combustion of rice husk, a char
discharge lever that allows the removal of burnt rice husk during operation, a
steam burner that is made of2-in. diameter stainless steel pipe that ignites
hydrogen gas from thesteam, a 12-mm diameter round bar support to firmly hold
the stove, and pot holder to support the cooking pot.
During operation, rice
husk fuel is ignited inside
the combustion chamber
using few pieces of
paper. The water inside
the steam tank is heated
until it becomes superheated steam. As the
steam passes through
the burner, hydrogen gas
is released and is ignited
inside the burner. A
luminous pinkish-to-
yellow flame is obtained
from the burner during
cooking. Burnt rice husk
is discharged at the
bottom of the grate by slightly pushing the lever. Disposal of char is made easy
by using a pan. The degree of burning of rice husk is controlled by regulating the
amount of fuel being fed in the combustion chamber. The amount of steam can
be regulated by adjusting the relief valve located at the side of the steam tank.
Schematic Drawing ofthe SuperTurboRice Husk GasifierStove
Fuel
Hopper
Air
Pipe
Support
Stand
Ash
Pan
Char
Discharge
Lever
Pot
Holder
Steam
Burner
Steam
Tank
Conical
Cover
Relief
Valve
Performance evaluation showed that the stove has a poweroutput of 5.5 kW. It
consumes 10.2 kg of rice husk per hour. Firing the stove only requires 1.2 min.
using few pieces of papers. Five liters ofwater can provide steam into the burner
for 1 hour and 30 minutes before reloading. Test also showed that 12.5 liters of
water can be boiled within 15 minutes. The average thermal efficiency of the
stove during the tests is 15.2%. Burning rate is 38.2 kg/hr-m
2
while the amount
of char produced is 25%.
The stove has the advantage compared with other rice husk stoves in terms of
the minimal amount of hydrocarbon released during burning, high efficiency in
heat utilized, ease of ignition andfiring, and less cost of operation. Commercial
models using stainless steel liner for steam burner is P15,000.00 per unit for
model 30D while P20,000.00 per unit for model 40D. Interested organizationsor
individuals who wish to adopt this technology may contact the Project Director,
AppropriateTechnology Center, Department of Agricultural Engineering and
Environmental Management, College of Agriculture, Central Philippine University,
Iloilo City, Philippines.Our landline is 063-033-3291971 loc 1071. You can also
send email to cpu_aprotech@yahoo.com. Good day and God bless!!!