Proximate and ultimate analysis of cotton pod used in the updraft gasifier

PROXIMATE AND ULTIMATE ANALYSIS OF COTTON POD USED IN THE UPDRAFT GASIFIER – A
REVIEW
G. GowriShankar
Assistant Professor,
Department Of Mechanical Engineering,
Erode Sengunthar Engineering College,
Erode, Tamilnadu, India.
Email: gowri3shankar@gmail.com
ABSTRACT:
Gasification is the process in which a solid
carbonaceous fuel is converted into combustible gas
using partial amount of air. The gases which evolve
are known as “producer gas”. This gas is more
suitable than the direct combustion of biomass.
Gasification involves partial combustion of the
organic part of the fuels to combustible gas in carbon
monoxide, hydrogen and some saturated
hydrocarbon gases, principally methane. In this paper
an updraft gasifier is constructed and is used to carry
out the experiment. The waste material like cotton
pod is used for the generation of producer gas. The
main objective of the present study is to investigate
many aspects of cotton pod as a potential energy
source, including major properties and characteristics
of cotton pod and way to evaluate cotton pod.
1. INTRODUCTION
In recent years the world facing a major
energy crisis. The fossil fuel have high energy density
compared to the biomass. Its bulkiness and
inconvenient form of biomass is the major problem for
utilization. Handling, storage, and transportation of
biomass is more costly compared to conventional fuel.
One of the easy way to handling the biomass is
converting solid biomass into liquid or gaseous fuel.
This conversion will be achieved by the two ways
biochemical and thermo chemical. Some Chemical
reaction, heat, mass transfer and pressure changes are
the complex process involving in biomass gasification.
The gasification process involved are drying ,
pyrolysis ,combustion ,reduction[1].wood and other
form of biomass including energy crops and
agricultural and forestry wastes are some of the main
renewable energy resources available. Combustion: it
is commercially available technology and minimum
risk to investor’s .it is used for immediately heat and
power generation. Heat storage is not a viable option
in the combustion process. Gasification: in the process
biomass produce the fuel gas or producer gas with the
mixture of carbon monoxide, carbon dioxide,
hydrogen and methane. pyrolysis: it is the thermal
decomposition process with absence of oxygen .it also
one of the process in the gasification[2].the biomass
fuels which have a different moisture contents, less
than 50% produces the gaseous fuel in the pyrolysed
with absence of oxygen. The biomass gasification
technology are expected to play an important role in
the future development of energy system. Based on the
gasification medium the biomass gasification can be
classified air, steam, air-steam mixture and oxygen-
steam mixture these are main gasification agent used
in the gasifiers. Basically air is used as the working
medium for the producer gas and it has low heating
value around 4000-7000 KJ/NM². The pure oxygen
result is highest quality gas around 10000-
18000KJ/NM3.[3]. Thermo chemical gasification of
biomass has been identified as a possible system for
producing renewable hydrogen.[4].biomass fuel such
as wood ,agricultural by products are the currently
form world’s third largest primary energy resources
after coal and oil.(1)pyrolysis or release of volatiles
and (2)conversion of the residual char are the two
overlapping stages in gas production in biomass.[5].
BIOMASS GASIFICATION PROCESS
In the gasification process the partial thermal
oxidation takes places and also produce a gas products
co2, water, carbon monoxide, hydrogen and gaseous
hydrocarbons and also produce the small quantities of
tar and ash based on the steam, air or oxygen
supplied[6].
The gasification process consists of the following
stages:
1. Drying: Moisture content in the biomass should be
in the range of 5% to 30%. It should be reduced into
5% due to the temperature range from 100-200°C.
2. Pyrolysis: Thermal decomposition of the biomass
with the absence of oxygen or air. Volatile matter in
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the biomass is reduced into hydrocarbon gases and
also the biomass converted into solid charcoal.
3. Oxidation: In the oxidation process carbon-dioxide
will be formed due to the reaction between the solid
carbonized biomass and oxygen in the air and the
hydrogen oxidized are generate water. Hydrogen will
oxidized and produce the large amount of heat. Partial
oxidation of carbon may occur resulting in the
generation of carbon monoxide.
4. Reduction: These reaction are mostly endothermic
the temperature range between 800-1000°C with the
absence of oxygen. several reaction are given below
[7], [8].
BIOMASS CHARACTERISTICS
1. PARTICLE SIZE
Heat transfer should be better when the
biomass size will be smaller and also the temperature
will be uniform[9]. The particle size of the biomass
material depends on the hearth dimension .it is
typically 10-20% of the hearth diameter. Large
particles can form bridges. While smaller particles are
clog the available air void age and leading to a high
pressure drop. Biomass pre-processing phase have a
major impact on gasification outcomes. Based on the
size of the biomass the be haviour will be differently
in the process[10].
2. MOISTURE CONTENT
Below 15% of moisture content is required
are otherwise the more energy is required for
gasification reaction. Moisture content above 30%
makes ignition difficult and reduces the CV of the gas
due to the need to evaporate the additional moisture
before gasification can occur. A high moisture content
reduces the temperature achieved in the oxidation
zone, and also incomplete cracking of hydrocarbons
released from pyrolysis zone. Increased levels of
moisture content and the presence of CO produces H2
by the water gas shift reaction and in turn the increased
hydrogen content of the gas produces more CH4[11].
3. ASH CONTENT
The gasification is impossible when the
mineral matter will be high. The oxidation temperature
is often above the melting point of the ash, leading to
clinkering or slagging problem in the feed and hearth.
Clinker is a problem for ash content it may be above
5% the ash is high in alkali oxides and salts. [11], [12].
PROCESS PARAMETERS AND THEIR
EFFECTS
Its affect the various performance aspects
like efficiency, product gas quality, energy and exergy
inputs. Such as temperature and heating rate on the
composition of the products and temperature changed.
addition of catalyst particle changed the selective of
gasification reaction enhancing hydrogen production
while reducing the level of methane produced at
temperature of above 500°C [13].
1. HEATING RATE
Fast pyrolysis the temperature rates of up to
1000°C /min at and low temperature below 650°C and
with rapid quenching the liquid. in the high heating
rate the char formation will be reduced[2]. Practical
technology must convert the biomass into cellulose,
hemicelluloses, lignin, protein and extractive
components of a biomass feedstock into a gas rich in
hydrogen and carbon dioxide and amount of tar and
char are formed. In the bed low temperature and high
feed concentrations, char formation occurs[14].
Cellulose, hemicelluloses, lignin are the major
components of wood[15].
2. EQUIVALENCE RATIO
Equivalence ratio strongly affected the gas
composition including the tar content these is ratio
between the oxygen content in the oxidant supply[16].
The ratio between the theoretical and
practical air demand in steam gasification process
utilizing air or O2 is termed the equivalence ratio (ER).
For each kind of biomass, there is a theoretical O2
demand needed to achieve the combustion based on its
contents of combustible materials. High ER decreases
the H2 production and increases the CO2 output.
increasing the equivalence ratio resulted in lower
pressure drop in the dense bed when the gasifier
operated at different fluidization velocities and bed
heights[17].
EFFECT OF GASIFICATION AGENT
Biomass like (cotton stalk, ground nut shell)
can be gasified using different gasifying media, the
choice depends on the product gas composition and
energy consideration. In Gasifier generally use steam
or air. Air gaification is an exothermic process which
produce a low heating value in CO and having small
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amount of H2 and higher hydrocarbons. Steam
gasification on the other hand is an endothermic
processes, which produce a medium heating value gas
in H2 and CO. used air steam mixture in the
gasification process in fluidized bed reactor. Steam to
air ratio on char was particularly strong at small ratio
due to the fact that the steam released at the
devolitization stage contributed to the gasification
process even in the case when steam was added. the
steam-air ratio increased the heating value was
increased and reached its peak value[18]. Investigated
the effect of air to steam ratio on the gasification of
wood shavings. An increase in the steam flow rate
resulted in lowering the gas yield, the heating value
and the energy recovery, although the reactor was
heated from outside which helped to keep the
temperature constant without any adjustment of the
flows[19][20].
EFFECT OF TURNDOWN RATIO
Turndown is the ability of the gasifier to
respond to the changes in the demand for the product
gas with different capacity and also the same time,
operated with a stable reaction zone. Turndown is
often quoted in the trade leaflets gasifier, but most of
these are ambiguous. It was observed that turndown
ratio goes up almost linearly with the increase of the
capacity of the dry fuel as well as the amounts of the
produced gas and combustible gas[21].
EFFECT OF TEMPERATURE
The different range of temperature in the
gasifier affects on the reaction rate and the
composition of the product; reduction in CO, CO2, and
CH4 occurs, and more H2 produced with increasing the
temperature .the char conversion decreases with the
temperature increase. Thus the gasification
temperature is needed to be selected carefully as a
tradeoff between the char conversion and the H2
output. that high H2 yield can be obtained at low
temperature (600oC) by using 90% steam content[22].
It is necessary to ensure that the product gas
is free of any solid carbon. As temperature increase,
carbon and methane both are reformed. In 726 °C both
are reduced to very small amount and in the process
get converted into CO and H2. Increase in hydrogen
mole numbers. At 756 °C, the hydrogen yield reaches
a maximum values in moles. At higher rate of
temperatures the H2 yield starts reducing. This is
attributed to the water gas shift reaction[23].
In most chemical reactions, the rate of
gasification is highly dependent on the temperature
.the product gas yield in the flash pyrolysis of maple
saw dust increased as the reactor temperature
increased whereas the liquid and solid products
decreased with increase in the pressure. The
decreasing the amount of the char indicated that the
conversion increased with increase in the temperature.
10 % and 50% basis conversion of the lignin at 350
and 450 °C, respectively it was attained[24].
Tars are normally produced during the
pyrolysis stage in low temperature. It decrease in the
tars content from 6290 mg/Nm3 dry gas at 740 °C to
412 mg/Nm3 at 850 °C of the producer gas with
increase in the temperature during air gasification of
beech wood. found that the tar content of the gas from
steam wood gasification is decreased from 3.17% at
504 °C to 0.58 % at 780 °C[25].
EFFECT OF PRESSURE
Simulation carried out to study the effect of
reducing pressure below 101.3KPa on equilibrium
product yield showed that increase in H2yield is
negligible even for pressures as low as 10.13 KPa.
Pressure has been reported to have a significant effect
on the gasification processes[26]. the first order rate
constant for the char gasification increased with
increase in the pressure. The role of increased pressure
has been investigated on the equilibrium percentage of
various species in the dry gas, char, and calorific value
of the gas, gasification efficiency, outlet gas
temperature and heat absorbed in the reduction zone.
It follows that the percentages of CO and H2 decrease
as the pressure increases while the CH4, CO2, N2 and
unconverted char grow with increasing the
pressure[27].
PROXIMATE ANALYSIS
The proximate analysis gives the moisture,
the volatiles, the fixed carbon and the ash contents in
the biomass fuel. From the analysis, the quality of
biomass fuel for usage in the gasifier is determined.
The significance of the volatiles and fixed carbon is
that they provide a measure of the ease with which the
biomass can be ignited and subsequently gasified or
oxidized, depending on how the biomass is to be
utilized as an energy source For example, a volatile
content of the wood of about 80% is higher compared
to a charcoal with volatile content of only 30%. This
is good for initiating the combustion in the oxidation
zone but too high means creating problems associated
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with tar formation because the formation of tar is
proportional to the volatile content [28].
MOISTURE CONTENT
The heating value of the gas produced by any
type of gasifier depends at least in part on the moisture
content of the feedstock. Moisture content can be
determined on a dry basis as well as on a wet basis.
Accurately measured 1g of the fuel samples was
measured and dried in an muffle furance at a
temperature of 105o
C for one hour. The following data
was obtained from the test [29].
Weight of the cotton pod before drying in the oven.
Weight of the cotton pod after drying in the oven.
The moisture content of the cotton pod on the wet basis
is defined as
MCwet =
𝑤𝑒𝑡 𝑤𝑒𝑖𝑔ℎ𝑡−𝑑𝑟𝑦 𝑤𝑒𝑖𝑔ℎ𝑡
𝑤𝑒𝑡 𝑤𝑒𝑖𝑔ℎ𝑡
× 100
The moisture content of the cotton pod on the dry
basis is defined as
MCdry =
100×𝑀𝐶(𝑤𝑒𝑡)
100+𝑀𝐶(𝑤𝑒𝑡)
VOLATILE MATTER
Accurately measured 1g of the fuel samples
was measured and dried in an muffle furnace at a
temperature of 950o
C for 7 minutes. This indicates that
all volatile matter has been driven off. After this, the
weight of the heated samples was taken [30].
Weight of the cotton pod before placing on
hot plate.
Weight of the cotton pod after heating on the
hot plate.
VM =
𝑊𝑒𝑖𝑔ℎ𝑡 𝑖𝑛𝑡𝑖𝑎𝑙−𝑊𝑒𝑖𝑔ℎ𝑡 𝑓𝑖𝑛𝑎𝑙
𝑊𝑒𝑖𝑔ℎ𝑡 𝑖𝑛𝑡𝑖𝑎𝑙
× 100
ASH CONTENT
Accurately measured 1g of the fuel samples
was measured and dried in a muffle furnace at a
temperature of 500-600o
C for two hours, the weight of
the samples was taken, and given as follows:
Initial weight of the cotton pod before placing on hot
plate [31].
Final weight of the cotton pod after heating on the hot
plate.
Ash = 100 −
𝑖𝑛𝑖𝑡𝑖𝑎𝑙 𝑤𝑒𝑖𝑔ℎ𝑡−𝑓𝑖𝑛𝑎𝑙 𝑤𝑒𝑖𝑔ℎ𝑡
𝑖𝑛𝑖𝑡𝑖𝑎𝑙 𝑤𝑒𝑖𝑔ℎ𝑡
× 100%
Ashes can cause a variety of problems
particularly in up or downdraught gasifiers. Slagging
or clinker formation in the reactor, caused by melting
and agglomeration of ashes, at the best will greatly add
to the amount of labour required to operate the gasifier.
If no special measures are taken, slagging can lead to
excessive tar formation and/or complete blocking of
the reactor. A worst case is the possibility of air-
channeling which can lead to a risk of explosion,
especially in updraft gasifiers [31] [32].
FIXED CARBON
The value of the fixed carbon is calculated as follows
[32]:
FC = 100 – (%moisture + %volatile matter +
%ash)
ULTIMATE ANALYSIS
Biomass fuels are characterized using the
ultimate and proximate analysis. The ultimate
analysis gives the composition of the biomass in
weight percentage of carbon, hydrogen and oxygen as
well as sulfur and nitrogen. This analysis will show the
elemental composition differences between sawdust
and other biomass fuels. The composition variations
among biomass fuels are large, but as a class biomass
has substantially more oxygen and less carbon than
other fuels. Less obviously, nitrogen, chlorine, and ash
vary significantly among biomass fuels. Generally,
biomass has relatively low sulfur compared to other
fuels [33].
1. Calculation of the percent fixed carbon on a dry,
mineral-matter-free basis:
DMMFFC =
𝐹𝐶
𝐹𝐶+𝑉𝑂𝐿
× 100
DMMFFC = dry mineral matter free fixed
carbon
FC = fixed carbon from fuel analysis
VOL = volatile matter
2.Calculation of the percentage volatile matter on
dry, mineral-matter basis
DMMFVOL =
𝑉𝑂𝐿
𝐹𝐶+𝑉𝑂𝐿
× 100
DMMFVOL = dry mineral matter free
volatile matter
VOL = volatile matter
3.Calculation of the weight percent of carbon in the
fuel.
C =
𝐷𝑀𝑀𝐹𝐹𝐶+0.9(𝐷𝑀𝑀𝐹𝑉𝑂𝐿−14)×(𝑉𝑂𝐿+𝐹𝐶)
100
C = elemental carbon in the fuel
DMMFFC = dry mineral matter free fixed
carbon
volatile matter
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4.Calculation of the weight percent of nitrogen in the
fuel.
N2 =
(2.1−0.012×𝐷𝑀𝑀𝐹𝑉𝑂𝐿)×(𝑉𝑂𝐿+𝐹𝐶)
100
N2 = Nitrogen in the fuel.
C = elemental carbon in the fuel.
volatile matter.
FC = fixed carbon from fuel analysis.
5.Calculation of the weight percent of hydrogen in
the fuel.
H2 =
𝐷𝑀𝑀𝐹𝑉𝑂𝐿 ×7.35
𝐷𝑀𝑀𝐹𝑉𝑂𝐿+10
− 0.013 × (𝑉𝑂𝐿 + 8)
H2 = Hydrogen in the fuel.
volatile matter.
FC = fixed carbon from fuel analysis.
VOL = volatile matter.
6.Calculation of the weight percent of oxygen in the
fuel.
O2 = 100 – (Ash + H2 + C + MOISTURE +
N2)
O2 = Elemental oxygen in the fuel.
Ash = ash analysis from the fuel.
H2 = Elemental hydrogen in the fuel.
C = Elemental carbon in the fuel.
7.Higher calorific value (HCV);
HCV =
1
100
(35000𝐶 + 143000(𝐻 −
𝑂
8
)
H = Hydrogen in the fuel (%).
C = Carbon content in the fuel (%).
O = Oxygen in the fuel (%).
8.Lower calorific value(LCV);
LCV = HCV -
9
100
× 𝐻 × 2442
HCV = Higher calorific value in KJ/Kg
H = hydrogen in the fuel [34] [35] [36]
BIOMASS AVAILABILITY
Agricultural waste may be used in several
applications, they are used as a fuels for cooking,
water and process heating, foods for animals, feed
stocks for fertilizer for agricultural field, materials for
roof construction, direct burning in boilers. All the
non-fodder, non-fertilizer agricultural residues with
low moisture content it will be considered as
feedstock’s for biomass gasification process. Biomass
are not available throughout the year, and the amounts
available depend upon harvesting time, storage related
characteristics, the storage facility. It has been
observed that, except for cotton pod, it considered in
the present work are available for a maximum period
of 6 months. The broad periods of availability of some
important agricultural residues are presented in
Table[37].
COLLECTION COST
The biomass are required to be collected at a
single point in a farm/agro-industry for stacking before
transportation. The collection cost of agricultural
residues depends upon the agricultural wage rate and
time required for their collection in a particular area.
The collection cost, Crc can be determined by dividing
the daily wage rate. W, by the carrying capacity, Cc
(tones per trip) and the number of trips, n, made by a
person in a day[38].
Crc = W / (Cc × n)
CONCLUSION
Renewable biomass has also been considered
as potential feed stocks for gasification to produce the
producer gas. They gasification of biomass is the
thermal treatment which result in a high proportion of
gaseous products and small quantities of char and ash.
Different process parameters should be consider for
the gasification process for proper production of gas.
This proximate and ultimate analysis of material will
helpful for producing good quality and quantity of
producer gas.
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