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Biomass Conversion Research Centre [Comparison of the biogas Plants]
Comparison among Different Models of
BIOGAS Plants
...
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Biomass Conversion Research Centre [Comparison of the biogas Plants]
CONTENTS
• Types of Biogas Plants.
• Figures of Bio...
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Biomass Conversion Research Centre [Comparison of the biogas Plants]
• TYPES OF BIOGAS PLANTS
Generally three tyes of ba...
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Biomass Conversion Research Centre [Comparison of the biogas Plants]
II. Fixed Dome Type Biogas Plant:
In fixed dome dig...
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Biomass Conversion Research Centre [Comparison of the biogas Plants]
• FIGURES OF THE BIOGAS PLANTS
1. Floating Gas Hold...
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Biomass Conversion Research Centre [Comparison of the biogas Plants]
2. Fixed Dome Type Biogas Plant.
Biomass Conversion Research Centre [Comparison of the biogas Plants]
3. Fixed Dome type With Expansion Chamber Biogas Plan...
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Biomass Conversion Research Centre [Comparison of the biogas Plants]
• COMPARISON TABLE OF DIFFERENT MODELS
Properties F...
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Biomass Conversion Research Centre [Comparison of the biogas Plants]
Life Span Life span is short. Life span is comparat...
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Biomass Conversion Research Centre [Comparison of the biogas Plants]
• SUMMARY OF THE ENTIRE COMPARISON.
From the study...
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Biomass Conversion Research Centre [Comparison of the biogas Plants]
• REFERENCES
• Biomass for Renewable energy, Fuels...
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Comparison among Different Models of Biogas Plants,
Design,
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Comparison among different_models_of_biogas_plant

  1. 1. 1 Biomass Conversion Research Centre [Comparison of the biogas Plants] Comparison among Different Models of BIOGAS Plants Absar Saleh SP09-BEC-001 Department Of Chemical Engineering, COMSATS Institute of Information Technology, LAHORE
  2. 2. 2 Biomass Conversion Research Centre [Comparison of the biogas Plants] CONTENTS • Types of Biogas Plants. • Figures of Biogas Plants. • Comparison Table of the Biogas Plants. • Summary of the entire comparison. • Conclusion. • References.
  3. 3. 3 Biomass Conversion Research Centre [Comparison of the biogas Plants] • TYPES OF BIOGAS PLANTS Generally three tyes of basic biogas plants are existing all over the world. The most abundant countries in producing biogas are United states of America, United Kingdom, Germany, Indian Subcontinent and China. The Currently working biogas plants are; Floating Gas Holder Type Biogas Plant. Fixed Dome Thpe Biogas Plant. Fixed Dome type With Expansion Chamber Biogas Plant. Basic Experimental Setup of all three biogas plants is briefly described below: I. Floating Gas Holder type Plants: This type of plant basically comprises of an under ground brick masonry digester connected with an inlet and outlet covered by a floating steel gas holder for gas collection. Gasholder moves up and down guided by a central guide pipe depending upon accumulation and discharge of gas. Floating gas holder made of mild steel alone accounts for some 40 percent of the total plant cost and accordingly these plants are much more expansive than fixed dome type. The gas holder is separated from the digester. A partition is provided in digester to encourage circulation. The floating gas holder provided at the top of the digester helps to keep the pressure constant. The gas holder rises when the pressure is increased due to production of gas and allows the generated gas to let out through the gas supply pipe. It lowers when pressure is decreased to stop the supply of the biogas.
  4. 4. 4 Biomass Conversion Research Centre [Comparison of the biogas Plants] II. Fixed Dome Type Biogas Plant: In fixed dome digester , the gas holder and the digester are combined. Gas is stored in the upper part of the digester. Upper portion of digester pit itself acts as a gas holder. Displaced level of slurry provides requisite pressure for release of gas for its subsequent use. The pressure inside the digester varies as the gas is collected. Fixed dome digester is usually built below the ground level and is suitable for cold regions. AAs the plant does not involves any steel parts, it can be built with local materials and hence its construction costs are low. III. Fixed Dome With Expansion Chamber type Biogas Plant: It has a curved bottom and hemispherical top which are joined at their bases with no cylindrical portion in between. Displaced slurry following digestion moves to the outlet displacement chamber as there is no displacement space on the inlet side. An inlet pipe connects mixing tank with the digester. This type of biogas palnt is very cheaper as compared with the other two types of Biogas plants.
  5. 5. 5 Biomass Conversion Research Centre [Comparison of the biogas Plants] • FIGURES OF THE BIOGAS PLANTS 1. Floating Gas Holder Type Biogas Plant.
  6. 6. 6 Biomass Conversion Research Centre [Comparison of the biogas Plants] 2. Fixed Dome Type Biogas Plant.
  7. 7. Biomass Conversion Research Centre [Comparison of the biogas Plants] 3. Fixed Dome type With Expansion Chamber Biogas Plant. Biomass Conversion Research Centre [Comparison of the biogas Plants] Fixed Dome type With Expansion Chamber Biogas Plant. 7
  8. 8. 8 Biomass Conversion Research Centre [Comparison of the biogas Plants] • COMPARISON TABLE OF DIFFERENT MODELS Properties Floating Gas Holder Type Biogas Plant Fixed Dome Type Biogas Plant Fixed Dome with Expansion Chamber Type Biogas Plant Experimental Setup The digester of this Plant is a deep well shaped masonry structure. In these is a partition in middle of the digester. Digester of this plant is a shallow well shaped masonry structure. No partition wall is provided. Digester id made of two segments of two spheres one each for the top and Bottom. Biogas Holder Gas Holder is generally made of the mild steel. It is inverted into the digester and goes up and down with the formation and utilization of gas. Gas holders the integral part of the masonry structure of the plant. Slurry from the gas storage portion is displaced out of the digester with the formation of gas and comes back when it is used. The structure described above includes digester and the gas storage chamber. Gas is stored in the same way as in the F.D type plant. Gas Pressure Remains Constant about 10 cm of water. Varies from 0-90 cm of water. Varies from 0-75 cm of water. Maintenance Cost Of maintenance is high because gas holder is to be prevented from corrosion. Cost of maintenance is low. Cost of maintenance is low.
  9. 9. 9 Biomass Conversion Research Centre [Comparison of the biogas Plants] Life Span Life span is short. Life span is comparatively long. Life span is between the other two plants. Extra features Identifying the defects in gas holder is easy. Space above the gas holder can be used. Ther is no moving part so no recurring expenditure. Required work place Requires relatively less excavation. Requires more excavation work. Requires high excavation work. Construction Digester can be constructed locally. The gas holder needs sophisticated workshop facilities. A trained mason using locally available materials can build entire plant. Entire plant can be build by a trained mason using locally available materials. Installation Cost Installation cost is very high. Over Rs. 6900.00 (Indian Currency) It is Cheaper then previous and the plant costs about Rs.5400.00 (Indian Currency) It is much Cheaper than both plants and its plant design costs Rs.4000.00 (Indian Currency).
  10. 10. 10 Biomass Conversion Research Centre [Comparison of the biogas Plants] • SUMMARY OF THE ENTIRE COMPARISON. From the study of entire comparison of the biogas plants we got the basic construction aspects and the experimental setup of a biogas plant that is generally an underground construction of a biogas digester with local materials such a as bricks, sand, cement etc. the instrumentation needed for the construction of the biogas plant are; • An underground digester – may be made of bricks, stones, concrete etc • An inlet pipe with a substrate receptacle, • An outlet pipe of exhauster slurry, • A floating gas dome for gas collection, • A gas outlet pipe Raw material supplied to the biogas plant can be cow dung ,human waste, wheat crops, sewage, paper waste, field grass and other cellulosic materials. • CONCLUSION Using the described methods of the biogas plants operation the third type of biogas plant which is fixed dome type with expansion chamber is more feasible and economically favorable than that of other two types of biogas digester palnts to get the benefits of renewable energy produced from gas at our campus.
  11. 11. 11 Biomass Conversion Research Centre [Comparison of the biogas Plants] • REFERENCES • Biomass for Renewable energy, Fuels and Chemicals (2006), Donald L Klass • Bio Renewable Resources (2004), Robert C Brown • Renewable Energy Resources (2005), G N Tiwari and M K Ghosal • Stewart, D and McLeod, NewZealand Journal of Agriculture, sept.1980 • Wikipedia: http://www.wikipedia.com/ • Microgy: http://www.microgy.com/technology.htm • Feasibility of an campus biogas operation at the university of Waterloo (2April 005) • Research Journal : Landfill Biogas and its use for Energy Generation, University of Sao Paulo • Ofoefule, Akuzuo U. , Nwankwo, Joseph I , Ibeto, Cynthio N, (Biogas Production from paper easte and its blend with cow dung), Advances in applied sciences research 2010 • Pelagia research Library: http://www.pelagiaresearchlibrary.com • Oumer Salim Mohamed Kaba, 2007 , Pilot Project for the installation of domestic biogas • Academic journals: http://www.academicjournals.com/INGOJ • Journal of achievements in materials and manufacturing engineering (2009) JAMMEP.Vindis,B.Mursec, M. Janzekovic, F. Cus • Uzodinma, E.O. and Ofoefule,A.u. , (Biogas production from blends of field grass with animal waste) • Technical note series, KARI Techniacal Note.10,january2003 (biogas Production)

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