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Transcript of 52621910-Pyrolysis
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BTE 4216
BIOMASS ENERGY
FAST PYROLYSIS OF COW DUNG FOR ENERGY
PRODUCTION
MUHAMMAD AIMAN BIN MOHD ZIN (0721471)
MOHD RAZI BIN KODIN (0714313)
ISMAIL TOPA (0713105)
MOHAMMAD ZAID BIN MOHAMMAD ZAINI (0637425)
MAHER MOHAMMED ALI (0612081)
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Contents
Contents 1
Introduction 2
Electricity generationBiomass: New alternative source of energy 4
Case study: Electricity from cow dunk 11
Cost estimation 17
Conclusion 19
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1.0Introduction
As biomass is a natural material, many highly efficient biochemical processes have
developed in nature to break down the molecules of which biomass is composed, and many of
these biochemical conversion processes can be harnessed.
Pyrolysis is the process of heating biomass in low-oxygen, which does not burn the
biomass in a combustion reaction, but instead causes the biomass to release energy-rich gases,
and leave a remainder of "biochar". The gas released in the pyrolysis process is called "producer
gas". It is a mixture of combustible gases that can be used (via combustion) to drive the
continued heating of the pyrolysis process, and can be used to generate electricity. Current
technology uses combustion of producer gas in turbines to generate electricity. Emerging
technologies can feed producer gas into fuel cells, thus generating electricity without
combustion.
Pyrolysis also produces pyrolysis oil, or "pyroil", which condenses out and separates
from the producer gas, which remains in gaseous form. Pyroil is an energy rich biofuel which
can be burned as heating oil, and can potentially be refined to higher-grade biofuel forms.
Biochar is the carbon-rich remainder of the biomass. It has some energy value, and could
be used for energy production in, for example, co-firing with coal. Biochar also has value as a
soil amendment, and it does not tend to break down and release CO2 over time, so it serves the
function of carbon sequestration.
Agricultural activities produce large quantities of animal wastes in the form of manures.
While some of the manure can be used as fertilizer, not all of it can be consumed in this way and
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the excess is an environmental liability. Another possibility is to use the manure as a direct or
indirect source of fuel for remote power generation. The use of animal manure for fuel has
several benefits.
1.1 Fast Pyrolysis
Fast pyrolysis for liquids production is of particular interest currently. Fast pyrolysis
occurs in a time of few seconds or less. Therefore, not only chemical re action kinetics but also
heat and mass transfer processes, as well as phase transition phenomena, play important roles.
The critical is sure is to bring the reacting biomass particle to the optimum process temperature
and minimize its exposure to the intermediate (lower) temperatures that favour formation of char
coal. One way this objective can be achieved is by using small particles, for example in the
fluidised bed processes that are described later. Another possibility is to transfer heat very fast
only to the particle surface that contacts the heat source. This second method is applied in
ablative processes that are described later.
In order to illustrate the science and technology of thermal conversion in sufficient detail
to appreciate the potential, fast pyrolysis is described at length. The use of pyrolysis process to
produce medium Btu fuel gases (350 550 Btu/ft3) for remote biomass power generation was
investigated. This approach has several advantages when compared to more conventional
processes.
Hence, our mini project will concentrate on how to generate electricity using cow dung as
source of biomass by fast pyrolysis means. Throughout this project we will design and estimate
the amount of source needed to generate 5000 MWh electricity using pyrolysis technique.
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2.0Electricity generation
Electricity generation is the process of generating electricity from other forms of energy.
The fundamental principles of electricity generation were discovered during the 1820s and early
1830s by the British scientist Michael Faraday. His basic method is still used today: electricity is
generated by the movement of a loop of wire, or disc of copper between the poles of a
magnet.For electric utilities, it is the first process in the delivery of electricity to consumers. The
other processes, electricity transmission, distribution, and electrical power storage and recovery
using pumped storage methods are normally carried out by the electrical power industry.
Electricity is most often generated at a power station by electromechanical generators,
primarily driven by heat engines fueled by chemical combustion or nuclear fission but also by
other means such as the kinetic energy of flowing water and wind. There are many other
technologies that can be and are used to generate electricity such as solar photovoltaic and
geothermal power.
2.1Methods of generating electricityThere are seven fundamental methods of directly transforming other forms of energy into
electrical energy:
1) Static electricity, from the physical separation and transport of charge (examples:turboelectric effect and lightning)
2) Electromagnetic induction, where an electrical generator, dynamo or alternatortransforms kinetic energy (energy of motion) into electricity
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3) Electrochemistry, the direct transformation of chemical energy into electricity, asin a battery, fuel cell or nerve impulse
4) Photoelectric effect, the transformation of light into electrical energy, as in solarcells
5) Thermoelectric effect, direct conversion of temperature differences to electricity,as in thermocouples, thermopiles, and Thermionic converters.
6) Piezoelectric effect, from the mechanical strain of electrically anisotropicmolecules or crystals
7) Nuclear transformation, the creation and acceleration of charged particles
(examples: betavoltaic or alpha particle emission)
Static electricity was the first form discovered and investigated, and the electrostatic
generator is still used even in modern devices such as the Van de Graaff generator and MHD
generators. Electrons are mechanically separated and transported to increase their electric
potential. Almost all commercial electrical generation is done using electromagnetic induction,
in which mechanical energy forces an electrical generator to rotate. There are many different
methods of developing the mechanical energy, including heat engines, hydro, wind and tidal
power.
The direct conversion of nuclear energy to electricity by beta decay is used only on a
small scale. In a full-size nuclear power plant, the heat of a nuclear reaction is used to run a heat
engine. This drives a generator, which converts mechanical energy into electricity by magnetic
induction.
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Most electric generation is driven by heat engines. The combustion of fossil fuels
supplies most of the heat to these engines, with a significant fraction from nuclear fission and
some from renewable sources.
3.0Biomass: New alternative source of energyBiomass, a renewable energy source, is biological material from living, or recently living
organisms, such as wood, waste, (hydrogen) gas, and alcohol fuels. Biomass is commonly plant
matter grown to generate electricity or produce heat. In this sense, living biomass can also be
included, as plants can also generate electricity while still alive. The most conventional way in
which biomass is used however still relies on direct incineration. Forest residues for example
(such as dead trees, branches and tree stumps), yard clippings, wood chips and garbage are often
used for this. However, biomass also includes plant or animal matter used for production of
fibers or chemicals. Biomass may also include biodegradable wastes that can be burnt as fuel. It
excludes such organic materials as fossil fuels, which have been transformed by geological
processes into substances such as coal or petroleum.
Industrial biomass can be grown from numerous types of plants, including miscanthus,
switchgrass, hemp, corn, poplar, willow, sorghum, sugarcane, and a variety of tree species,
ranging from eucalyptus to oil palm (palm oil). The particular plant used is usually not important
to the end products, but it does affect the processing of the raw material.
3.1Chemical composition
Biomass is carbon, hydrogen and oxygen based. Nitrogen and small quantities of other
atoms, including alkali, alkaline earth and heavy metals can be found as well. Metals are often
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found in functional molecules such as the porphyrins which include chlorophyll which contains
magnesium.
Plants in particular combine water and carbon dioxide to sugar building blocks. The
required energy is produced from light via photosynthesis based on chlorophyll. On average,
between 0.1 and 1 % of the available light is stored as chemical energy in plants. The sugar
building blocks are the starting point for the major fractions found in all terrestrial plants, lignin,
hemicellulose and cellulose
3.2
Biomass sources
Biomass energy is derived from five distinct energy sources: garbage, wood, waste,
landfill gases, and alcohol fuels. Wood energy is derived both from direct use of harvested wood
as a fuel and from wood waste streams. The largest source of energy from wood is pulping liquor
or black liquor, a waste product from processes of the pulp, paper and paperboard industry.
Waste energy is the second-largest source of biomass energy. The main contributors of waste
energy are municipal solid waste (MSW), manufacturing waste, and landfill gas. Biomass
alcohol fuel, or ethanol, is derived primarily from sugarcane and corn. It can be used directly as a
fuel or as an additive to gasoline.
Biomass can be converted to other usable forms of energy like methane gas or
transportation fuels like ethanol and biodiesel. Rotting garbage, and agricultural and human
waste, release methane gas - also called "landfill gas" or "biogas." Crops like corn and sugar
cane can be fermented to produce the transportation fuel, ethanol. Biodiesel, another
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transportation fuel, can be produced from left-over food products like vegetable oils and animal
fats. Also, Biomass to liquids (BTLs) and cellulosic ethanol are still under research.
4.0Case study: Electricity from cow dunk
In 2001, Malaysia has about 723 400 cows in various farm across country. The use of cow
dung as a source of electricity is still rare. Most of the application of cow dung is as a fertilizer.
4.1Reactor design
4.1.1 Process from cow dung to methane gas
COW DUNG
COLLECTIO
NPOND
Pyrolysis
anhydrocellulose
-glocusan
dehyratione
Char, tar, CO, CO2,
H2O
Char
Combustible
volatiles
depolymerization
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4.1.2 Products of pyrolysis from cow dungThe pyrolysis process of cow dong is possible due to the nature of it. It has very high
composition of carbon source. The following table shows the analysis of the elements present in
cow dung.
Basis Moisture Ash C H O S N
Ash free 24.5 - - - - - -
Dry - 74.0 13.2 1.8 8.5 0.6 1.9
Dry Ash Free - - 50.5 7.1 32.8 2.3 7.3
The dung goes under flash pyrolysis producing up to 90% combustible gases. When the process
is finish, other form of solid would be found in small amount about 10%.The emission of the
gases in the primary pyrolysis is collected; the contents are summarized as the following tables.
The first table shows the categories of the gas compositions.The second table shows the
composition in more details.
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The flash pyrolysis uses a very rapid residence t ime (fraction of a second) and very high
temperature (1000-3000C). Thus resulting in gases as the primary products. The data shows the
contents of solid is only 9.06% represents as tar. For the purposes of generating energy, we
conseider only two of the produced gases; CH4 and C2H5. The reason is that they are combusted
into CO2 andH2O and not leaving harmful emotions as Acetaldehyde or Acetone.
CH4 produced per 1 kg dung = 0.74% 100 = 0.0074kg
C2H5 produced per 1 kg dung = 0.13% 100 = 0.0013kg
Component Freewt.%
Tars 9.06
CH4 0.74
H2O 19.93
CO2 24.87
CO 15.64C2H4 0.13
SO2 0.49
COS 0.58
NH3 0.93
HCN 1.46
Formic Acid 0
Acetic Acid 0.5
CH3OH 0.47
Formaldehyde 0.54
Acetaldehyde 2.57
Acetone 0.72
HNCO 0.86
NO 1.42
Component Freewt.%
Moisture 26
Ash 52.7
VolatileMatter 17.2
FixedCarbon 4
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4.1.3 Energy from the gasesThe two main gases in our pyrolysis would be used to produce electricity. We are here to find the
energy given by combustion of these two gases. The energy is the heat of reaction.
For Methane:
CH4(g) + 2 O2(g) CO2(g) + 2 H2O(l) G = -891 kJ/mol
The energy released = 891kJ/mol 1mol/12g = 74.25 kJ/g 1000g/kg = 74,250 kJ/kg
The energy released per 1 kg dung = 74,250 kJ/kg 0.0074 kg = 519.75 kJ
519.75 kJ / 3600 kWh/kJ = 0.144375kWh per 1 kg dung
For Ethylene:
C2H4(g) + 3O2(g) 2 CO2 (g) + 2 H2O(l) G = -1409.5kJ/mol
The energy released = 1409.5kJ/mol 1mol/12g =117.458333kJ/g1000g/kg = 117,458.33kJ/kg
The energy released per 1 kg dung = 117,458.33kJ/kg 0.0013 = 152.7 kJ
152.7 kJ / 3600 kWh/kJ = 0.0424166667kWh per 1 kg dung
The total sum of energy produced by 1 kg of cow dung is = 0.144 + 0.042 = 0.186kWh
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4.2 Energy production
After the pyrolysis processes, the product are collected. In our case the products are
methane and ethy1ene. The heat released by combustion of those gases in 1kg of dung produces
0.186kWh.
These gases have very high combustion value with an efficiency of 78% of the heat converted to
electricity in the plant generator.
To produce 5000MWh of electricity;
5000MWh = 5 000 000 kWh
The energy of heat of reaction has to be = 5,000,000 kWh/0.78 = 6,410,256.41 kWh
The amount of dung needed for 5000MWh electricity = 6,410,256.41/0.186
= 34,463,744.1kg of dung
= 34,463.74tons of cow dung
1 cow produces 0.065 tons of dung per day, in a year = 0.065 365 = 23.72 tons
Total cow for the dung required per day to give 5000MWh electricity =
(34,463.74)* (0.065)= 224,014.31head of cows
In 2001, Malaysia has 723,400 cows across country. Assuming a proper collection of cow
dung is performed and only a single power plant is use. The amount required for 5000MWh
electricity is34,463.74 tons. It is reasonable to be collected and sent one plant since we need only
224,015 cows from 723,400 across the country.
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5.0Economic analysisA. Raw materials
34,463.74 tons of cow dung
RM 20 per ton = RM 20 34,463.74 = RM 689,274.8
= RM 689,274.8
B. ChemicalsThe fuel for the combustion process = RM10,000
= RM10,000
C. Facility constructionAssuming in Pahang
I. Land:RM 16,550 per acre (10) = RM 165,500
= RM 165,500
II. Pyrolysis facility:Bubbling Fluid Bed Reactor @ Dyna Motive (Vancouver,Canada) for 1000t/d ( 34)
= RM 10m 34 = RM 340,000,000
Hot Vapour Filtration @ NREL & VTT
=RM 20k 17 = RM 340,000
Operating cost of the pyrolysis process = RM 1,000,000 annually
=RM 341,340,000
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III. Electricity plant:Generator RM 1 million (4) = RM 4,000,000
= RM 4,000,000
IV. Storages and utilities:Tanks (for dungs) RM 100,000
Tanks (Gas) RM 465,000
Separation Station RM 50,000,000
Pumping Station RM 85,000
Buildings and warehouse RM 5,600,000
Pipings RM 1 ,000,000
Water and Electricity RM 670,000
Maintainace RM 2,500,000
= RM 60,420,000
D. Transportation:25 Lorries RM 3,500,000
Fuels and tolls RM 70,000
= RM 3,570,000
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E. Labors:250 workers RM 2000 per Month 12 Month = RM 6,000,000
= RM 6,000,000
F. Emergency & other costs:RM 50,000 per month x12 month = RM 600,000
Total cost 1st year= RM 416,194,774.80
2nd
year= 1st
year Fixed cost = RM 416,194,774.80 RM 405,225,500 = RM 10,969,274.8
Revenue = 5,000,000 KWh RM 0.23 per KWh = RM 1,150,000 per day
Revenue per year = 1,150,000 365 = RM 419,750,000
Profit 1st
year = RM 419,750,000 - RM 416,194,774.80 = RM 3,555,225.20
Profit 2nd
year = RM 419,750,000 - RM 10,969,274.8 = RM 408,780,725.20
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6.0ConclusionAs discussed in this project, we could conclude that biomass energy is a better alternative
to generate energy and income. Specifically, cow dung that can really build a more feasible
economical project and it keep a clean environment.
Hence, our mini project studied the ways and methods of generating electricity using cow
dung as source of biomass. In the project we have designed and estimated the amount of source
needed to generate 5000 MWh electricity using biochemical conversion. Besides, we also
propose a power plant suitable to generate electricity using cow dung. The economical studies in
terms of costs and profits were also discussed.
To sum up with, We could propose using cow dung as source of energy that can be a very
feasible and viable economical project as well.
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7.0 Reference
http://www.theepochtimes.com/n2/content/view/1604
http://www.oardc.ohio-state.edu/
http://helenchangwriter.com/2010/11/14/creating-electricity-from-cow-dung-and-old-
frying-oil/