CARBO CONSULT & ENGINEERING (Pty) Ltd
P.O. Box 1397, Cramerview 2060 Johannesburg, South Africa
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THE ENVIRONMENTALLY FRIENDLY WOOD GAS PRODUCER SYSTEM WITH
TAR FREE CONTINUOUS GAS PRODUCTION FOR ELECTRIC POWER GENERATION AND / OR HEAT APPLICATIONS.
TABLE I. DETAILED DATA OF SYSTEM JOHANSSON STANDARD DESIGN, NORMAL SIZE WOOD GAS
PRODUCERS FOR ENGINE AND HEATING APPLICATIONS.
The maximum gas production and power output given in the
table below, is based on working at an atmospheric pressure
of 760 mm Hg and a temperature of 0° C, as “normal”
conditions. The power output is also based on using diesel
engines converted to natural aspirated spark ignited wood
gas power with reduced compression ratio and with valve
timing modified for the slow wood gas combustion. A lower
wood gas heat value of 5,500 kJ/Nm3 with combined engine x
alternator efficiencies as shown in the table below and
including adjustment for unavoidable losses, has been used.
Should the combined efficiencies vary from those given in
this table, the power output can then be adjusted pro-rata.
Unavoidable efficiency losses occur with the combustion of
wood gas in an internal combustion engine. These result
mainly from volume reduction, as compared to expansion with
the combustion of liquid petroleum fuel. There are also
smaller losses resulting from the slight increase in the
polytrophic exponent for the engine compression stroke and
the small loss caused by the advanced timing, which is
necessary for obtaining full wood gas combustion. In order
to compensate for some of these losses an estimated 10%
power reduction has been allowed, after converting the
thermal energy to electric power, while using the combined
engine x generator efficiencies as shown below. |
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GASPRODUCER
STANDARD TYPE |
UNIT/DATA |
13-15/30 |
16-30/60 |
20-60/100 |
25-100/150 |
35-150/300 |
| MAX GAS OUTPUT |
Nm³/h |
120 |
180 |
300 |
450 |
850 |
| MAX. THERMAL
OUTPUT |
kWth. |
180 |
275 |
460 |
685 |
1,300 |
MAX.WOOD BLOCK
FUEL CONSUMPTION. |
kg/h |
60 |
90 |
150 |
225 |
425 |
GROSS VOLUME FULL
FUEL COMPARTMENT |
m³ |
0,7 |
1,0 |
1,7 |
2,5 |
4,75 |
GROSS WEIGHT FULL
SOFT WOOD (250 Kg/m3). |
kg |
175 |
250 |
425 |
625 |
1,180 |
GROSS WEIGHT FULL
HARD WOOD (340 Kg/m3). |
kg |
240 |
340 |
580 |
850 |
1,600 |
COMBINED ENGINE x
GENERATOR EFFICIENCY. |
% |
32 |
32 |
33 |
33 |
34 |
MAX. POWER OUTPUT
WITH ABOVE COMBINED
EFFICIENCY LESS 10%. |
kVA |
50 |
80 |
140 |
200 |
400 |
75% SAFE RUNNING
TIME ON SOFT WOOD. |
Hrs |
2,2 |
2,0 |
2,1 |
2,1 |
2,1 |
75% SAFE RUNNING
TIME ON HARD WOOD. |
Hrs |
3,0 |
2,8 |
2,8 |
2,8 |
2,8 |
MAIN SAWDUST FILTER
DIAMETER (TWO OFF). |
Metres |
1,35 |
1,6 |
2,0 |
2,5 |
3,5 |
DONALDSON ENGINE
SAFETY FILTERS. |
TYPE |
FHG 08-0200
(1 OFF) |
FHG 12-0014
(1 OFF) |
FHG 14-0022
(1 OFF) |
FHG 16-0048
(1 OFF) |
FHG 16-0048
(2 OFF) |
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TABLE II.
DETAILED DATA OF SYSTEM JOHANSSON SPECIAL DESIGN, LARGE NON-STANDARD
SIZE
WOOD GAS PRODUCERS FOR ENGINE AND HEATING APPLICATIONS. |
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