Technology
The development of Bio-mass Gasification technology over the past 20 years has significantly increased the use of various solid fuels & synthesis gas. The Gasifier is essentially a reactor, where various complex physical & chemical processes take place like Drying, Heating, Pyrolysing, Particle Oxidation & finally Reduction as it flows through it. The gas, which produced is know as Producer Gas.
Direct combustion of biomass is generally inefficient and smoky and cannot be easily controlled. About 200 million tonnes of firewood and an equivalent amount of agricultural residues are burnt annually in India with an approximate end-use efficiency of 10%. Under controlled conditions characterized by low oxygen supply and high temperatures, most biomass materials can be converted into a gaseous fuel known as producer gas, which has a lower calorific value (1000–1200 kcal/Nm3) but can be burnt with high efficiency and good degree of control without emitting smoke. In energy terms, the conversion efficiency of the gasification process is in the range of 60%–70%. Usage of Gasifier instead of conventional direct burning devices will lead to savings of a minimum of 50% fuel.
For thermal applications, the technology has been well proven and gasifier systems are already working in the field. The capacity installed so far covers a wide range of applications at different capacities. The Gasifier range is from 900 KW(t) to 7500 KW(t).
The Gasifier can convert any type of coal/Bio-mass into Producer Gas, The chemical composition of Producer Gas are:
CO 20 ±2%
CH4 03 ±1%
H2 18 ±2%
CO2 11 ±2%
N2 Rest
Process
The essence of gasification process is the conversion of solid carbon fuels into carbon monoxide by thermo chemical process. The gasification of solid fuel is accomplished in air sealed, closed chamber, under slight suction or pressure relative to ambient pressure. Gasification process occurring in general explained in this section.
Gasification is quite complex thermo chemical process. Splitting of the gasifier into strictly separate zones is not realistic, but nevertheless conceptually essential. Gasification stages occurs at the same time in different parts of gasifier.
In gasification, the combustion is carried out at sub-stoichiometric conditions with air to fuel ratio being 1.5:1 to 1.8:1. The product gas thus generated during the gasification process is combustible. This process is made possible in a device called gasifier with a limited supply of air.
A gasifier system basically comprises of a reactor, where the gas is generated and is followed by a cooling and cleaning train which cools and cleans the gas. The clean combustible gas known as producer gas is available for high grade heat in burners, power generation through reciprocating engines or gas turbines. In the reactor the biomass pieces after undergoing drying and devolatisation in the upper zones, leave behind the char.
The volatiles undergo oxidation in the combustion zone, with air being partially supplied by the surrounding nozzles and the remaining drawn from the open top. The product gases of oxidation further gets reduced by a bed of charcoal and yield a combustible gas having a calorific value of 4.5-5.0 MJ/Kg with an average composition of CO: 20 +/- 1%, CH4: 3 +/- 1%, H2: 20 +/- 1%, CO2: 12 +/- 1% and rest N2.
Features of Bio-mass Gasifier
- Low Nox, Sox formation due to low flame temperature.
- As producer gas burnt instead of solid fuel, particulates and smoke emissions are extremely low.
- Does not contribute to green house gas emission and global warming, as Biomass is CO2 neutral.
- Worldwide environment friendly accepted renewable technology.
- Payback periods are 6 – 8 months.
The essence of gasification process is the conversion of solid carbon fuels into carbon monoxide by thermo chemical process. The gasification of solid fuel is accomplished in air sealed, closed chamber, under slight suction or pressure relative to ambient pressure. Gasification process occurring in general explained in this section.
Applications
The Gasification technology has wide range of applications, notably in:
Ceramic Kilns, Forgings Industries, Lime Kilns, Biscuit Kiln, Hot Air Generator, Rotary Kilns, Glaze Kiln, Spray Dryer, Annealing Kilns, Roller Kiln, Various types of Dryers, Oven & Furnaces, Billet Pre-Heating Kilns and Incinerator Boiler.
Maximum temperatures 1300 ºC can be obtain by optimal air pre-heating & pre-mixing of air with producer gas.
Applicable Solid Fuel
- Charcoal
- Briquette/Bio-coal
- Lignite
- Steam Coal (Imported/Indian)
Solid Fuel Size
Solid Fuel Size > 10 mm
Moisture % Max. 25%
Ash Content Up-t0 30%
Applicable Industries
Ceramics Industries, Chemicals Industries, Rubber Industries, Food Processing Unit, Pharmaceuticals, Paper & Pulp Industries, Textile Processing Unit, Various Dryers, Cement Industries, Forgings Industries, Rolling Mills and other Industries where heat is required.
Models
|
Models
|
Thermal Output Capacity in K.cal/Hr.
|
Liquid Fuel Replace Capacity (Litre/Day)
|
Liquid Fuel Replace Capacity (Litre/Hr.)
|
|
RREDA-900
|
774000
|
1080 – 1800
|
45 – 75
|
|
RREDA-1500
|
1290000
|
1800 – 3000
|
75 – 130
|
|
RREDA-2000
|
1720000
|
2400 – 4200
|
100 – 175
|
|
RREDA-2500
|
2150000
|
3000 – 5000
|
125 – 215
|
|
RREDA-3000
|
2580000
|
3600 – 6000
|
150 – 260
|
|
RREDA-4000
|
3440000
|
4000 – 8000
|
175 – 325
|
|
RREDA-5000
|
4300000
|
5000 – 10000
|
200 – 430
|
|
RREDA-6000
|
5160000
|
7000 – 12000
|
300 – 500
|
|
RREDA-7000
|
6200000
|
10000 – 14000
|
400 – 600
|
|
RREDA-8000
|
6880000
|
12000 – 15500
|
500 – 650
|
Want to know more? Download product leaflet here or send us an email.
