PROXIMATE AND ULTIMATE ANALYSIS The analysis of a woody biomass from California

Question

PROXIMATE AND ULTIMATE ANALYSIS

The analysis of a woody biomass from California is reported as follows (wt. %)

Moisture                            38.6

Volatile Matter                 80.9

Fixed Carbon                     18.3

Ash                                      0.8

Carbon                               50.7

Hydrogen                           5.7

Sulfur                                  0.09

Oxygen                               42.94

Nitrogen                             0.57

Calculate the “as received”, “dry”, “dry-ash-free” proximate and ultimate analysis

Explanation / Answer

Proximate analysis: This analysis is carried out to determine the chemical composition of coal. Compositions included in this analysis are moisture , volatile compounds, ash content , fixed carbon. As-received: this is a category where items are considered without any loss of ingredients. Moisture: 38.6 Volatile matter: 80.9 Fixed carbon: 18.3 Ash: 0.8 Total: 138.6 Dry : without moisture . Therefore: total is 138.6-38.6 = 100 Dry-ash free: without ash and moisture : 100-0.8 99.2 Ultimate analysis : carbon hydrogen sulphur oxygen and nitrogen content which is total 100 in weight.

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