Development And Performance Evaluation Of Rice Destoning Machine
The title “Development and Performance Evaluation of a Rice Destoning Machine” encapsulates a project focused on the design, construction, and assessment of a specialized device tailored for separating stones and other impurities from rice grains. This endeavor delves into the engineering intricacies involved in crafting such a machine, emphasizing efficiency, reliability, and cost-effectiveness. Through rigorous testing and analysis, the effectiveness and efficiency of the destoning machine are evaluated, considering factors such as throughput capacity, separation accuracy, energy consumption, and ease of operation and maintenance. This research aims to contribute to the enhancement of rice processing technologies, ultimately bolstering the quality and profitability of rice production while minimizing wastage and optimizing resource utilization.
A motorized rice de-stoning machine was designed, fabricated and evaluated for performance. The traditional method of rice de-stoning machine characterized with a lot of deficiency in terms local rice containing smaller stones during de-stoning operation. A lot of energy is expended in solving the problem of operation. The rice de-stoning consists of the following part: Hopper, Vibrating Sieve, Machine Frame, Pulley, Eccentric Shaft, and Blower. The factors investigated were feed rate (500g/min) and variety off rice (Bokola, Kodoqiche, AlhajiA’aba). The result of the evaluation reveals that in Stone Separation Efficiency the third variety has the highest efficiency of (77.3%) and the first variety has the lowest efficiency of 72.6%, while in Rice separation efficiency the third variety also has the highest efficiency of 81.0% and the second variety has the lowest efficiency of 79.0%, the Impurity levels after separation are 7.8%, 7.5% and 6.5% respectively, the Tray losses remains the same. The rice de-stoning machine was powered by 1hp electric motor and the cost of production was estimated to be 108,700.
Title page
Certification
Dedication
Acknowledgement
Abstract
Table of content
CHAPTER ONE
1. INTRODUCTION 1
1.1 Background of the study 1
1.2 Aim and Objective of the project 3
1.3 Justification of the project 3
1.4 Scope of the project 3
CHAPTER TWO
2. LITTERATEUR REVIEW 4
2.1 De-stoning of rice 4
2.2 Rice production in Nigeria 4
2.3 Rice processing 7
2.4 Traditional method of processing rice 7
2.5 Modern method of processing rice 7
2.6 Method of de-stoning 8
2.7 Local method of de-stoning rice 9
2.8 Modern method of de-stoning rice 9
2.9 Review of existing work on rice destining rice 11
CHAPTER THREE:
MATERIALS AND METHOD 13
3.1 Description of the machine 14
3.2 Design Consideration of the machine 14
3.3 Design Calculation and analysis 14
3.4 Material Selection 19
3.5 Fabrication Procedure and Assembly 20
3.6 Principle of Operation 21
3.7 Bill of Engineering Measurement and Evaluation (BEME) 23
3.8 Performance Evaluation 24
CHAPTER FOUR
RESULT AND DISCUSSION
4.1 Result and Discussion 26
CHAPTER FIVE
CONCLUSION AND RECOMMENDATIONS
5.1 Conclusions 28
5.2 Recommendation 28
Reference 29
Appendix 31
INTRODUCTION
1.1 Background of the study
Rice (Oryza sativa) is a cereal belonging to the Gramineae, a large monocotyledonous family of some 600 genera and around 10,000 species (Wibberley, 1989). It is valued as the most important staple food for over half of the world population (International Year of Rice, 2004) and ranks third after wheat and maize in production on world basis. More than half of the world’s population depends on rice as the major source of calories (FAO, 2003).The amount consumed by all these people ranged from100kg to 240kg per annum in the year 2000 alone (FAO,2003). Twospecies have emerged as our most popular cultivated rice,Oryza sativaand Oryzaglaberrima; of these two species the more widely produced is Oryza sativa.
Rice is cultivated in almost all part of the globe including Nigeria. By 2015, it has been estimated that over three-fifth of the world population will depend on rice as their staple food (Echiegu, 2009). Rice is one of the staple foods in Nigeria and it is cherished by almost all the ethnic groups and it is prepare into various delicacies. For instance, in the northern part of Nigeria, rice can be milled and used for flour and also molded and fried into cakes. Large acres of plantation can be found in these areas, Lafia (northern Nigeria), Beneu state (Middle Belt), Osun state (Western Nigeria), Abakaliki (Eastern Nigeria) and several other places.
In Nigeria, rice consumption has risen tremendously at about 10% per annum due to changing consumer preference (Akande, 2003). However, (Ebuehi and Oyewole, 2007) discovered that most Nigerians prefer to consume imported rice brands as compared to local rice varieties. The reason is that most Nigerian rice processors lack adequate technology of rice processing to meet international standard. It is valued as the most important staple food for over half of the worldpopulation (International Year of Rice,2004) and ranks third after wheat and maize inproduction on world basis. More than half of the world’spopulation depends on rice as the major source of calories(FAO, 2003). The amount consumed by all these people ranged from100kg to 240kg per annum in the year 2000 alone (FAO,2003). Twospecies have emerged as our most popular cultivated rice,Oryza sativaand Oryzaglaberrima; of these two species themore widely produced is Oryzasativa.
In Nigeria, rice consumption has risen tremendously atabout 10% per annum due to changing consumer preferences (Akande, 2003). However, Ebuehi and Oyewole (2007) discovered that most Nigerians prefer toconsume imported rice brands as compared to local ricevarieties. The reasonis that most Nigerian rice processors lackadequate technology of rice processing to meet internationalstandard. It is one of the most important staple crops in Nigeria, and local production of the commodity has increased several folds in the last 4 decades. Despite the increasing trend in local production, Nigeria is still a net importer of rice. In the local markets there is a greater consumer preference for imported rice compared to the locally produced commodity because of some quality issues associated with the local rice. Presence of stones in locally processed.
Nigerian rice has been identified as one of the major quality problems. The small Engleberg rice processing mill used by majority of rice processors in Nigeria, which includes a dehusking element and a polisher do not come with de-stoners. De-stoners are found only in a few high-tonnage integrated mills or are sold as separate equipment.
It was in the above context that the DFID-sponsored Promoting Pro-Poor Opportunities in Commodity and Service Markets (PrOpCom, 2012) engaged the services of M & A’s Greenery Ltd to conduct a survey of improved drying and de-stoning techniques and technologies in Nigeria.
1.2 The aim and objectives of the project
The aim of the projectis to de-stone rice in other to have clean rice for human consumption.
The specific objectives are to:
i. develop a rice de-stoning machine
ii. evaluate the rice de-stoning machine in terms of impurity level after separation, tray loss, rice separation efficiency and stone separation efficiency.
1.3 Justification of the project
This project leads to the followings, to improve the quality of rice, to increase production, to minimize time and reduce human labour, to reduce losses in de-stoning of rice compare to the local method, to reduce import of rice to the country and to produce job opportunity for the youths in the country.
1.4 Scope of the project
The project work is limited to rice which are abundantly cultivated in Nigeria for human consumption. The project work of the machine is limited to some selected factors such as rice separation efficiency and stone separation efficiency.
SHARE PROJECT MATERIALS ON:
Rice Destoning Machine:
A rice de-stoning machine, also known as a rice destoner or rice stone removing machine, is a piece of equipment used in the rice milling industry to remove stones, pebbles, and other impurities from rice grains. The presence of these impurities can affect the quality of the rice and damage milling machinery, so it’s essential to eliminate them.
Here’s how a typical rice de-stoning machine works:
- Feeding: Raw rice grains, along with stones and other impurities, are fed into the machine through a hopper.
- Separation: The machine uses various mechanisms to separate the rice grains from the impurities based on their size, weight, and density. One common method is the use of vibrating screens or perforated plates with different hole sizes. As the material moves over these screens or plates, smaller and lighter impurities fall through while the rice grains continue forward.
- Air Flow: Some rice destoners also use air flow to help separate the rice from the impurities. A fan generates a controlled airflow, and as the rice grains are carried along by the air, the heavier stones and impurities drop into a separate chamber due to their greater weight.
- Collection: The separated rice grains and impurities are collected in different containers or chambers. The cleaned rice is typically sent for further processing or packaging, while the impurities are removed for disposal.
Rice de-stoning machines come in various sizes and capacities, depending on the volume of rice processing required. They are widely used in rice mills to improve the quality of the final product and reduce the risk of damage to milling equipment.
These machines are essential for ensuring that the rice produced is free from foreign materials and meets the desired quality standards. They play a crucial role in rice processing operations, helping to produce clean and high-quality rice for consumers worldwide.