การปรับปรุงคุณภาพน้ำมันหล่อลื่นใช้แล้วให้เป็นน้ำมันเชื้อเพลิงโดยกระบวนการไพโรไลซิส

Abstract

This research investigate the improvement of used lubricant quality for five varieties, including engine oil, gear oil, hydraulic oil, turbine oil, and transformer oil, by converting them into fuel via a pyrolysis process in a continuous two-stage reactor. In the second stage, HZSM-5 is added in quantities of 0, 50, and 100 grams as a catalyst. The entire process was conducted in an atmosphere of nitrogen with a flow rate of 1,000 ml/min. Depending on the variety of oil, the pyrolysis temperature was maintained between 350 and 500C. It was discovered that the procedure without the catalyst produces more pyrolysis oil. However, processes that used 50 or 100 grams of catalyst result in increased heating value and decreased viscosity due to the catalyst's ability to shorten the hydrocarbon chains in the molecules. In spite of this, the pyrolysis oils without the catalyst exhibited diesel-like properties, making them appropriate for testing in agricultural diesel engines with direct injection. It was discovered that the engine performance with pyrolysis oil was comparable to diesel. However, it released more carbon monoxide and nitrogen oxides than diesel. Last but not least, when using only thermal cracking, without any catalytic stage, the cost of pyrolytic oil was 35.96 for used engine oil, 26.97 for used transmission oil, 27.84 for used hydraulic oil, 23.97 for used turbine oil, and 17.26 Baht per litre for used transformer oil.