Background
Crop | Residue | Residue-to-product ratio | Total crop production | Residue production |
---|---|---|---|---|
(tonnes/tonnes of crop) | (tonnes) | (tonnes) | ||
Maize | Cob | 1.00 | 1,872,000 | 1,872,000 |
Millet | Stalk | 3.00 | 219,000 | 657,000 |
Rice | Straw | 1.50 | 429,000 | 643,500 |
Sugar cane | Bagasse | 0.30 | 145,000 | 43,500 |
Coconut | Shell | 0.60 | 298,000 | 178,800 |
Oil palm fruits | EFB | 0.25 | 2,004,000 | 501,000 |
Cocoa | Pods, husk | 1.00 | 632,000 | 632,000 |
Coffee | Husk | 2.10 | 1200 | 2,520 |
Total | 5,600,200 | 4,530,320 |
Methods
Materials and material preparation
Moisture content
Briquetting process
Physical and mechanical properties of briquettes
Relaxed density
Compressive strength
Impact resistance index
Results and discussions
Relaxed density of briquettes produced from maize cob particles, Ceibapentandra and their mixture
Biomass material | Mixing percentages | Compacting pressure | |||
---|---|---|---|---|---|
(weight basis) | 20 MPa | 30 MPa | 40 MPa | 50 MPa | |
Maize cobs only | Pure (100%) | 541 | 611 | 636 | 659 |
C. pentandra only | Pure (100%) | 523 | 622 | 666 | 716 |
C. pentandra/Maize cobs | 90:10 | 565 | 641 | 695 | 742 |
C. pentandra/Maize cobs | 70:30 | 584 | 645 | 708 | 749 |
C. pentandra/Maize cobs | 50:50 | 588 | 661 | 730 | 774 |
Source |
df
| ANOVA SS | Mean square | Fratio | pvalue |
---|---|---|---|---|---|
Biomass raw material | 4 | 76,341.54 | 19,085.3850 | 114.13 | <0.0001* |
CP | 3 | 392,450.76 | 130,816.92 | 782.28 | <0.0001* |
Biomass material × CP | 12 | 12,562.94 | 1,046.9117 | 6.26 | <0.0001* |
Error | 80 | 13,378.00 | 167.225 |
Compressive strength in cleft of briquettes produced from maize cobs,Ceiba pentandra and their combination
Biomass material | Mixing percentages | Compacting pressure | |||
---|---|---|---|---|---|
(weight basis) | 20 MPa | 30 MPa | 40 MPa | 50 MPa | |
Maize cobs only | Pure (100%) | 0.12 | 0.12 | 0.41 | 0.54 |
C. pentandra only | Pure (100%) | 29.23 | 39.26 | 40.40 | 44.58 |
C. pentandra/Maize cobs | 90:10 | 27.29 | 37.33 | 44.98 | 59.22 |
C. pentandra/Maize cobs | 70:30 | 16.66 | 22.82 | 30.00 | 33.47 |
C. pentandra/Maize cobs | 50:50 | 7.72 | 13.02 | 19.46 | 24.04 |
Source |
df
| ANOVA SS | Mean square | Fratio | pvalue |
---|---|---|---|---|---|
Biomass raw material | 4 | 23,287.04 | 5,821.76 | 865.24 | <0.0001* |
CP | 3 | 3,530.87 | 1,176.96 | 174.92 | <0.0001* |
Biomass material × CP | 12 | 1,437.39 | 119.78 | 17.80 | <0.0001* |
Error | 80 | 538.28 | 6.73 |
Impact resistance index of briquettes produced from maize cobs, Ceibapentandra and their combination
Biomass material | Mixing percentages | Compacting pressure | |||
---|---|---|---|---|---|
(weight basis) | 20 MPa | 30 MPa | 40 MPa | 50 MPa | |
Maize cobs only | Pure (100%) | 0 | 0 | 0 | 0 |
C. pentandra only | Pure (100%) | 200 | 283 | 316 | 350 |
C. pentandra/Maize cobs | 90:10 | 200 | 300 | 400 | 500 |
C. pentandra/Maize cobs | 70:30 | 142 | 192 | 233 | 450 |
C. pentandra/Maize cobs | 50:50 | 115 | 133 | 150 | 217 |
Source |
df
| ANOVA SS | Mean square | Fratio | pvalue |
---|---|---|---|---|---|
Biomass raw material | 4 | 1,496,860.70 | 374,215.175 | 62.44 | <0.0001* |
CP | 3 | 394,655.95 | 131,551.983 | 21.95 | <0.0001* |
Biomass material × CP | 12 | 223,064.90 | 18,588.742 | 3.10 | 0.0012* |
Error | 80 | 479,451.20 | 5,993.140 |