In India, rice is cultivated on a mass scale. Rice is one of its most important dietary staples and more than 65% of its human population relies on rice for its daily food requirement. The rice crop occupies more than 37% of the total crop area in India and accounts for almost 44% of all the food grains produced in the country. An integral process of rice production is rice milling. And just like in any nation where rice is produced on a large scale, rice milling has been around for a very long time in India. The need for milling arises because paddy cannot be consumed in its raw form and requires rice grader. Owing to this huge global demand for rice, rice milling, today, is a fast-growing agro-business which you can successfully leverage for financial benefits. However, being a commercially profitable business, setting up a rice mill requires extensive knowledge and capital.

Rice is an important food crop in India and second most important crop in the world. It is the staple food for the world’s most densely populated region and for hundreds of millions in Asia, Africa and Latin America. In India, rice processing is the oldest and the largest agro processing industry. At present it has a turnover of more than Rs. 36,500 crores per annum. India processes about 85 million tones of paddy per year and provides staple foodgrain and other valuable products required by the population. Recently, more than 50 % of the overall rice production is processed by modern mills, 40 % by conventional mills, and the remaining 10 % by hand pounding.

Rice milling industry is one of the most energy consuming industries. Like capital, labour and material, energy is one of the production factors which used to produce final product. In economical term, energy is demand-derived goods and can be regarded as intermediate good whose demand depends on the demand of final product. This paper deals with various types of energy pattern used in rice milling industries viz., thermal energy, mechanical energy, electrical energy and human energy. The important utilities in a rice mill are water, air, steam, electricity and labour. In a rice mill some of the operations are done manually namely, cleaning, sun drying, feeding paddy to the bucket elevators, weighing and packaging, etc. So the man-hours are also included in energy accounting. Water is used for soaking and steam generation. Electricity is the main energy source for these rice mills and is imported form the state electricity board grids. Electricity is used to run motors, pumps, blowers, conveyors, fans, lights, etc. The variations in the consumption rate of energy through the use of utilities during processing must also accounted for final cost of the finished product. The paddy milling consumes significant quantity of fuels and electricity. The major energy consuming equipments in the rice milling units are; boilers and steam distribution, blowers, pumps, conveyers, elevators, motors, transmission systems, weighing, etc. Though, wide variety of technologies has been evolved for efficient use of energy for various equipments of rice mills, so far, only a few have improved their energy efficiency levels. Most of the rice mills use old and locally available technologies and are also completely dependent on locally available technical personnel.

Paddy in its raw form cannot be consumed by human beings. Therefore, it needs to be suitably processed for obtaining rice. Basically, rice milling is the process that helps in removal of hulls and bran’s from paddy grains to produce polished rice. If you live in a highly paddy producing area, you can establish a rice mill plant of your own. The improved rice mills have a better husk and rice bran aspiration system. The same prevents mixing of finely broken with rice bran. Therefore, the quality of rice bran obtained is better. Moreover, rice mill plant is the techno-commercially profitable business.

Rice destoner is for removing stones and broken grains from a batch of milled rice. This research was carried out to modify an existing rice destoner for the purpose of increasing its capacity and efficiency. Modification introduced addressed challenges associated with the existing machine, such as low stone removal efficiency and low air flow channel, which affects the aerodynamic lifting of the rice grains. Performance was evaluated for 3 kg of locally milled rice samples based on the design capacity of the machine, cleaning efficiency and degree of grain flow. The result showed that the design capacity (1.8 kg/h) of the modified destoner was higher than that of the existing (0.86 kg/h). Also, the modified machine has 40.8% destoning efficiency which is higher than that of existing machine (2.58%).

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