Presentation on theme: "Question - What size of calcium carbide granule would result in the longest overall burn time in a carbide miner’s lamp?"— Presentation transcript:
1 Acetylene gas production: Effect of carbide granule size on overall burn time in miners’ cap lamps
2 Question -What size of calcium carbide granule would result in the longest overall burn time in a carbide miner’s lamp?
3 Hypothesis –In the reaction of calcium carbide and water, decreasing the granule size of calcium carbide will increase the reaction rate due to an increased total surface area.
4 Background Information- Total surface area increases as granule size decreasesManipulation of reaction is generally done only through control of water flowVarious sizes of calcium carbide is availableVery little information available – (antiquated)Calcium carbide and water are flammable and explosive“Carbide cannons” use powdered calcium carbide
7 Assumptions –Heat of reaction and its effects on burn time are negligibleCalcium carbide samples are consistent qualityWater flow does not vary in lampVariation of water volume at initiation of combustion has negligible effect on overall burn time
9 Calcium carbide(CaC2) was classified by size and weighed into 20 gram samples
10 Equipment Used- Cross-section of lamp Carbide Miner’s Lamp Diagram Source:Cross-section of lampCarbide Miner’s Lamp
11 Procedures- Lamp was loaded with weighed and screened sample Lamp was filled with waterWater flow setting was set at a constantLamp was lit and allowed to burn until flame was extinguishedEach sample size was tested twice and burn time was averagedFlame length was measure at 30 minutes
12 Safety consideration – Due to safety concerns, the finest granule size 2-3mm was not testedLamp was loaded with the sample and reacted without combustionGas production was instantaneous and profuseResults most likely would have been short burn time and extreme flame length, aka. EXPLOSION!!!!!
15 Culminating Argument- Claim - Decreasing CaC2 granule size reduces the overall burn time in carbide lamp by increasing the reaction rate.Support - As successively finer sizes of carbide were reacted in lamp, the burn time in minutes effectively decreased. Flame length was also measured and graphed to indicate reaction rate.
17 Final Thoughts -Based on the sizes of calcium carbide granules tested, the ideal size which would maximize overall burn time would be 12mm.Further testing of granule sizes above 12mm would indicate if larger granule sizes work in this type of lamp.
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