The Freon Burning Pre-preliminary Experimental Study Of The Mixed Hydrolysis Resources

CFCs are broadly utilized in chemical industry due to its superior physical and chemical properties. However there have been severe environmental issues, such as greenhouse effect, caused by the damages in ozone layer as a result of CFCs emissions in the atmosphere. The threat of CFCs is becoming a global topic and it raises the importance of complete destruction of CFCs. This paper discusses an enhanced combustion method for CFCs destruction. The combustion of a premix of CFC (CFC-12), LPG, air, and water will generate HF, HC1 and CO₂ . Sodium hydroxide lye is then used to absorb the mixture, and CaCl₂ solution stabilizes the fluorine that has been absorbed by the lye. This process result in the reutilization of chlorofluorocarbon. The major results are as follows:(1) This paper proposes the design of a set of CFCs decomposition equipment, including its setup, test, and operational procedures, and identifies the correlation with temperature change and other operational parameters. During the decomposition process, temperature of the mixture close to the inlet will rise quickly, and reach 550-600℃ in 10 minutes, and then stabilizes and reaches its balance at 1150℃. Our tests have revealed that the best combustion occurs when the coefficient of surplus air is 1.2 and the ratio of assistant air supply is 30%. The maximum flux of LPG for our system is 1801/h, and the maximum flux of CFCs at the inlet is 1151/h.(2) Various test results were analyzed for different mix level of reactant and for different combustion temperatures. It has also been indicated that high temperature and oversupply of steam are key factors contributing to the decomposition. For our system, the best result is reached while the ratio of steam to CFCs is 3:1. When the combustion temperature is below 500°C, the decomposition efficiency is below 10%. This number increases with the temperature and will reach 85% at 1000℃ .(3) The fluorine in the absorbent will be stabilized by CaCl₂ solution. Very high conversion ratio can be achieved when the amount of CaCl₂ exceeds 10 times of the theoretic calculation capacity of the need of the fluo(?)ine,while our test has shown the highest conversion ratio to be 98.8%. However, the content of CaF2 was only 12.3%, and we used HC1 to boost the yield of CaF2. It also has been demonstrated that the added HC1 should be sufficient to make the pH value of solution to be lower than 1.0.The final results of our study indicates that our design can achieve a decomposition efficiency as high as 83%, which achieves the effective reutilization of fluorocarbon.