Design and Fabrication of Pellet Stove

:- A Pellet stove is Mechanical Device which uses compressed wood or biomass pellets to create a source of heat for residential and industrial spaces [6]. These stoves are electronically sophisticated appliances that offer an environmentally friendly and low-cost heating option. Its Fuel consists of wood chips, waste of nuts, grasses, and lumber yard waste. The Pellets which are filled in the combustion chamber is then ignited [3]. Pellets are heavily compressed, so they're dense and low in moisture, creating a hotter flame. The combustion chamber serves as the carburettor for the stove, mixing the air and fuel to create combustion. The ashes from the burnt pellets are captured in an ash pot, which needs to be cleaned periodically. Wood pellet stoves are generally small, and the bags of pellets are about the size of a mulch bag, making them easy to store. They're also easy to operate; they only require loading pellets and igniting the flame. Because the fire is contained in a heat box inside the unit, there is a minimum of smoke, which lessens the smell in your home and prevents the outside of the unit from heating up. Pellets create considerably less ash than firewood [5], giving off less creosote, a flammable by product of combustion that can build up and cause chimney fires.


INTRODUCTION:
Energy is the key input for socio-economic development of any Nation. The fast industrialization and rapid urbanization have generated a high demand of energy in all forms i.e. thermal, mechanical and electrical. To meet this everincreasing demand, fossil fuels such as coal, oil and natural gas have been overexploited in an unsustainable manner. The overexploitations of fossil fuels have been posing serious environmental problems such as global warming and climate change [4]. We are more dependent on imports of petroleum. To concerns over health, climate change and energy security so the energy crisis of the World to look for less expensive and more efficient. To solve mentions problem and efficient cooking the Pellet stove is best option we had. By provide efficient cooking stoves to rural areas an effort to reduce air pollution and conservation of other energy sources. The Main reason behind less pollutant emission by Pellet Stove is Wood Pellet which containing less Carbon [4]. Our Objective is to produce residential Multi burner Pellet Stove which can replace Domestic home appliances as Gas Burner. We will try to optimize cost effective and high efficient cooking by using Multi burner Pellet Stove. Pellet stoves could also significantly reduce greenhouse gas emissions and zero percentage CO2 emission [5]. Such a program would avoid 17 percent of the premature deaths and disability from respiratory infections, heart disease, and bronchitis that would have occurred in 2020, saving some 55.5 million years of healthy life that would otherwise be lost from air pollution exposure, the study found[4].

WORKING PRINCIPLE:
The pellets are filled in combustion chamber to within 2 cm of the secondary air supply. Then pellets are ignited at the top zone with a match and allowed to burn for a minute or so. When a stable flame is established all around, Using the power supply or rechargeable battery fans are operated and primary air is supplied to the combustion chamber. Primary air is used for "gasification process" of pellets. Then the secondary air is supplied to the top of the combustion chamber with the help of the fan [7]. ➢ Ungratified pellets: -This is the zone where the unburnt pellets are placed. It is above the grate plate in combustion chamber.
➢ Pyrolysis zone: -Pyrolysis is a thermo chemical decomposition of organic material at elevated temperatures without the participation of oxygen. The pyrolysis gas is forming in this zone due to the decomposition of pellets.
➢ Intermediate zone: -This is the zone, in which the formed pyrolysis gas goes to the flaming zone.
➢ Flaming zone: -In the flaming zone, gas is burnt with the help of secondary air.
LITRETURE REVIEW: Larry Hepper, Carl Williamson show a pellet stove is disclosed comprising a reverse flow heated air pathway defined by stove sections. In an illustrated embodiment, the space between upper and lower stove sections is open to provide a heating or oven area. The stove can be readily disassembled in part for easy portability [8]. Gary Wisener Says A pellet stove utilizing gravity feed and natural draft more effectively and efficiently burns pellet fuel while producing less air pollution and ash. In one embodiment, the pellet stove has a primary combustion area comprising a burn unit removably disposed in the vent tube, a feed tube defining a fuel chamber above the burn unit and a secondary combustion area, comprising a burn box defining a secondary burn chamber, below the burn unit. A control mechanism controls the air flow to regulate the heat generated by the pellet stove [1].

MATERIAL SELECTION: ➢ Insulating Material
For the insulating purpose different material like Cerawool, Ceramics are there. As we know cerawool is good insulator but due to cost of cerawool is high and we have to provide some material to protect cerawool against direct contact with heat, in that case pellets are over burnt due to natural conduction of material. To eliminate above mentioned problem we select ceramic as insulating Material. ➢ Grate For the grate material we can select M.S. and Cast Iron. Due to the advantages of Cast Iron (C.I.) like easily machinability, low cost, low weight so we select Cast Iron as grate material. ➢ Supporting structure For supporting the structure and proving good strength, ductile material, easily available we select the Mild steel as outer body.

COMPARISON OF ENERGY RATING OF FUELS:
This is a breakdown of what the most common forms of energy rating.  CONCLUSION:-It is conclude that, the wood pellet stove has been started and operated indoors without creating pollution with high grade of thermal Energy. The wood pellet stove is ecofriendly, which emit less carbon dioxide compare to other fuel. We are introducing multiple burner pellet stove which is useful for domestic purpose such as cooking, heating etc. Our stove has multi burner which has different configuration and dimension so we can use it lower and higher capacity as per requirement. However, we believe that there is still much work to be done in optimizing the stove for various fuels, determining the effect of moisture, adapting it to various cooking situations and developing other uses. For that reason we are publishing our preliminary results here and hope that others will help adapt these principles to improve world cooking and energy conservation. REFERENCES: