TESTS OF BABCOCK & WILCOX BOILERS WITH GREEN BAGASSE ____________________________________________________________________ | Duration of Test | Hours | 12 | 10 | 10 | 10 | | Rated Capacity of Boiler |Horse Power| 319 | 319 | 319 | 319 | | Grate Surface |Square Feet| 33 | 33 | 16.5 | 16.5 | | Draft in Furnace | Inches | .30 | .28 | .29 | .27 | | Draft at Damper | Inches | .47 | .45 | .46 | .48 | | Blast under Grates | Inches | ... | ... | ... | .34 | | Temperature of Exit Gases | Degrees F.| 536 | 541 | 522 | 547 | | /CO_{2} | Per Cent | 13.8 | 12.6 | 11.7 | 12.8 | | Flue Gas Analysis { O | Per Cent | 5.9 | 7.6 | 8.2 | 6.9 | | \CO | Per Cent | 0.0 | 0.0 | 0.0 | 0.0 | | Bagasse per Hour as Fired | Pounds | 4980 | 4479 | 5040 | 5586 | | Moisture in Bagasse | Per Cent |52.39 |52.93 |51.84 |51.71 | | Dry Bagasse per Hour | Pounds | 2371 | 2108 | 2427 | 2697 | | Dry Bagasse per Square Foot| | | | | | | of Grate Surface per Hour| Pounds | 71.9 | 63.9 |147.1 |163.4 | | Water per Hour from and at | | | | | | | 212 Degrees | Pounds |10141 | 9850 |10430 |11229 | | Per Cent of Rated Capacity | | | | | | | Developed | Per Cent | 92.1 | 89.2 | 94.7 |102.0 | |____________________________|___________|______|______|______|______| Tan Bark--Tan bark, or spent tan, is the fibrous portion of bark remaining after use in the tanning industry. It is usually very high in its moisture content, a number of samples giving an average of 65 per cent or about two-thirds of the total weight of the fuel. The weight of the spent tan is about 2.13 times as great as the weight of the bark ground. In calorific value an average of 10 samples gives 9500 B. t. u. per pound dry.[43] The available heat per pound as fired, owing to the great percentage of moisture usually found, will be approximately 2700 B. t. u. Since the weight of the spent tan as fired is 2.13 as great as the weight of the bark as ground at the mill, one pound of ground bark produces an available heat of approximately 5700 B. t. u. Relative to bituminous coal, a ton of bark is equivalent to 0.4 ton of coal. An average chemical analysis of the bark is, carbon 51.8 per cent, hydrogen 6.04, oxygen 40.74, ash 1.42.