In the present study, the market wastes were treated and made as fine briquettes by using a portable rotary dryer. For the experimental purpose, a portable rotary dryer was designed and developed to determine the drying conditions of market waste. A U-type electric air heater of 1000 W were installed in the heating unit along with solar parabolic dish collector. The input parameters for the experiments are drying temperature (120 °C), rotation of dryer (3 rpm), air velocity (5 m/s), initial residue temperature (30 °C) and residue bulk density (200–250 kg/m³). Mixed market wastes are in the proportions such as: Briquette 1: watermelon lund 40% + drumstick pods 10% + beans pods 30% + drumstick peels 20%, briquette 2: watermelon lund 30% + drumstick pods 30% + beans pods 20% + drumstick peels 20%. The final product resulted in fiber form, which can be compacted to an even size of fuel briquettes which can be directly used for commercial and domestic heating. The performance of rotary dryer was analyzed based on inner rotary drum depth position (z = 0 m, z = 0.25 m, z = 0.5 m) and drying time (up to 150 min). The performance parameters like variation in moisture ratio, drying temperature, dry air humidity and air temperature were investigated in the present study. Residence time required for drying the mixed market waste up to milling moisture content (< 20%) in the developed dryer takes 150 min, while the sun drying takes 12–14 h generally. Calorific value of the fuel briquettes produced in the study is determined as 16.2–17.8 MJ/kg. The developed rotary air dryer provides a promising alternative to landfilling because of its low cost of construction, easy operation, green energy utilization and portability.

中文翻译：

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新型旋转式空气干燥机处理混合市场垃圾的实验研究

在本研究中，使用便携式旋转干燥机将市场废物处理成细团块。为了实验目的，设计并开发了一种便携式旋转干燥机，以确定市场废料的干燥条件。在加热单元中安装了1000 W的U型电空气加热器以及太阳能抛物面集热器。实验的输入参数是干燥温度（120°C），干燥器旋转（3 rpm），风速（5 m / s），初始残渣温度（30°C）和残渣堆积密度（200–250 kg / ³米）。市场废料的比例如下：煤饼1：西瓜隆德40％+鸡腿荚10％+豆荚30％+鸡腿果皮20％，煤饼2：西瓜隆德30％+鸡腿荚30％+豆荚20％ +鸡腿皮剥落20％。最终产品形成纤维形式，可以将其压制成均匀大小的燃料团块，可直接用于商业和家庭取暖。根据内部旋转滚筒的深度位置（z = 0 m，z = 0.25 m，z = 0.5 m）和干燥时间（长达150分钟）分析旋转干燥机的性能。在本研究中研究了诸如水分比，干燥温度，干燥空气湿度和空气温度的变化等性能参数。在已开发的干燥机中，将混合市场废料干燥至磨粉含水量（<20％）所需的停留时间为150分钟，太阳晒一般需要12-14小时。研究中产生的燃料团块的热值确定为16.2-17.8 MJ / kg。研发的旋转式空气干燥机具有造价低，易于操作，绿色能源利用和便携性等优点，可作为填埋的替代方案。