The effect of heat, air mass flow rate and temperature on paddy drying time using rotary type dryer

2nd Nommensen International Conference on Technology and Engineering

Zainuddin^1 ; Eswanto^1 ; Jufrizal^1 ; Mulyadi^1 ; Barita^1 ; Nasution, Amirsyam^2

Mechanical Engineering Department, Faculty of Industrial Technology, Institut Teknologi Medan, Jl. Gedung Arca No. 52, Medan

20217, Indonesia^1

Mechanical Engineering Department, Universitas Medan Area, Medan, Indonesia^2

关键词: Air mass flow rate;    Air temperature;    Alternative energy;    Data retrieval;    Drying process;    Exhaust gas temperatures;    Helical coil heat exchangers;    Maximum speed;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/420/1/012017/pdf
DOI  :  10.1088/1757-899X/420/1/012017

来源: IOP

【 摘 要 】

In this study a heat exchanger was manufactured and utilised as paddy dryer. Diesel engine exhaust gas was used to heat the air and supplied to the heat exchanger. A shell and multi tube helical coil heat exchanger was employed with shell length and diameter of 1,050 mm and 152.4 mm, respectively. Furthermore, a tube with twenty coil and 3,250 mm length was attached inside the shell where coil diameter and helical coil number are 58.8 mm and 4, correspondingly. Besides, Heat source was generated from the diesel engine exhaust gas. The engine can generate 54 kW of power and maximum speed of 3600 rpm. The aim of this research is to analyse the paddy drying time using rotary type dryer equipped with heat exchanger. This study based on experimental work, the data retrieval procedure is the way in which to obtain the necessary data to be analyzed, where the procedure is initially the water is loaded into the tank and the valves are all open, then the pump switch is switched on so that water flows in the drains of the appliance heat exchanger and then diesel engine turned on so that hot gas flow in the gas line. This is done to dispose of the air contained in the heat exchanger, let it last for a while until the exhaust gas temperature goes into the heat exchanger in steady state. The result revealed that in order to obtain 14% of paddy moisture content, it took 8 hr and 33 minutes of drying time at 46.7 °C of air temperature with the rate of air mass flow of 0,057383 kg/s. Whereas, it was 8 hr and 37 minutes long to get the same moisture content when the air temperature and air mass flow were maintained at 70.4 °C and 0,082788 kg/s, accordingly. The energy needed to dry the paddy at 46.7 °C was 19374.89 kJ. In contrast, it was required 18932.03 kJ of energy at 70.4 °C. If it is seen from the explanation then the main conclusions of this research that by using this rotary type drying tool the drying process can be done and can save cost and time, besides that also this finding provide recommendation information related to the utilization of alternative energy for drying.