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From : williamwallus
Added: May 21, 2007
How to reproduce this experiment The CFR project is a High Temperature Plasma Electrolysis fully based on the Tadahiko Mizuno experiment from the university of Hokkaido in Japan. This is a very interesting experiment and its implication can be a real breakthrough in the field of New and Clean energy source.... The enhanced CFR is composed of a 2000 mL thermostatic reaction vessel filled with 800 mL of demineralized water and Potassium Carbonate ( K2CO3 ). The electrolyte solution commonly used is 0.5 molar ( 0.5 M ). There are three temperature probes ( K probe or PT100 ). Two probes are used for measuring the temperature of the cooling water (Temp In and Temp Out ), and one probe is used for measuring the temperature of the electrolyte solution. You need also to use a flowmeter to measure the cooling water flow. The Cathode used is a 4 mm tungsten rod. The tungsten rod can be a pure tungsten rod or a Th-loaded tungsten TIG electrode (WT20) (with thorium oxide ThO2: 1.70% to 2.20% ) commonly used for plasma welding. The use of a Th-loaded rod increases the life of your cathod. The sputtering effect produced by the thermionic emission is lower with a Th-loaded rod than with a pure tungsten rod. The anode used is composed of stainless steel mesh ( a grid ) maintained with stainless steel rods. If you have planned to conduct some chemical analysis, I recommend you to use a grid made with platinum or nickel . All the wires connections are made with a 1.5 mm2 copper flexible wire gained with silicon. To avoid projections of some drops of the electrolyte solution from the CFR during the plasma ignition sequence, I recommend you to put floating balls on the surface of the liquid (hollow floating balls; pp, 20mm, 2000 PK from Cole Parmer Instrument ). Use a DC Power Supply which is able to give about 300 V DC at 20 A ( don't use AC voltage ). The voltage is tuned with an autotransformer Switch on the fume hood, Set the autotransformer to 0 Volt and switch on the power supply, The voltmeter (set on DC) is connected at the input of the CFR cell and the DC current clamp is connected on the positive wire, Turn the knob of the autotransformer so as to get 30V DC on the CFR cell, Let the electrolysis warm up the cell up to 50°C, At 50°C drop the voltage to 0 Volt and switch off the main power supply, Wait 30 sec to exhaust the mixture of hydrogen/oxygen, Measure the temperature ( TSinp ) of the input of the cooling water, Measure the temperature ( TSout ) of the output of the cooling water. Measure the temperature ( Tr_initial ) of the electrolyte then, immediatly, switch on the power supply, Slowly, turn the autotransformer knob so as to get 200 VDC across the cell. Start the chronometer, Note the Voltage and Current values at the permanent regime (pink glow discharge), End the run after ~3 minutes. ( set the voltage to 0 Volt and switch off the power supply ). Stop the chronometer (time). Measure the temperature ( Tr_final ) of the electrolyte, Measure the flow of the cooling water (Flow in L/min), Measure the temperature ( TEinp ) of the input of the cooling water, Measure the temperature ( TEout ) of the output of the cooling water.
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