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ITC Paperboards and Specialty Papers Division - Green Boiler

Technology


Green Boiler

Installation of Green boiler is an initiative to replace one of the coal fired boilers with a biomass residue fired boiler for steam generation. Boiler is designed to fire biomass residues (wood bark, tops and lops) from the plantations of pulpwood as the major fuel (90% of the total biomass residue used), along with agricultural crop residue from paddy, cotton, chilly, maize, red gram. A small amount of chip dust is also fired in the boiler which is a biomass derived by-product of the process of chipping of wood in the paper plant.

Green boiler utilizes the biomass in absence of which the equivalent amount of biomass residue would have been burnt in an uncontrolled manner without utilizing them for energy purposes.
 

The green boiler contributes to the generation of green energy, which prevents the firing of coal which would have been used in the absence of the boiler.


Green boiler will also help to avoid the methane emission which would have happened due to decay of biomass residues in the plantation sites. The biomass for the steam generation in the boiler will be obtained from the following sources:


a) Tree barks from the ITC’s plantation
b) Lops and tops from ITC’s plantation.
c) Chip dust from the ITC’s in-house wood chipping unit.
d) Rice husk from nearby agricultural fields.
e) Cotton stalk from the nearby agricultural fields.
f) Chilly stalk from the nearby agricultural fields.

The above biomass used in the project boiler (obtained from the agricultural fields and plantation sites) otherwise would have been dumped or left to decay under clearly anaerobic conditions.

Besides other points, it has been stated that the project technology (i.e. Biomass residue fired boiler) would result in better fuel combustion and would result in lesser ash generation as the ash content in biomass is less than the ash content in coal.

Benefits:

COAL: Coal savings through fuel switch 

CDM: Reduction in CO2 emission due to saving coal generates more than 73,000 CER per annum through CDM

Utilization of available biomass improves the biomass component in the unit’s primary fuel mix. Unit Bhadrachalam has fuel mix of 55% fossil and 45% carbon neutral (biomass.


Installation of biomass fired boiler significantly improves the biomass component, reducing carbon foot print.
 

Ash handling

As total steam generation remains same before and after Green Boiler and due to usage of biomass in place of coal, fly ash generation will reduce by ~20,000TPA.

 
ENVIRONMENTAL IMPACT OF THE PROJECT

As a general rule, considering surface moisture & lower GCV, 1 MT of coal is replaced by 2 MT of biomass consumption.  

Social Benefit: Source of revenue for farmer by selling the biomass from their fields which otherwise is burnt without realizing the energy value.

Environmental Benefit: Lower GHG emissions in manufacturing pulp & paper resulting in lower carbon footprint

Economic Benefit: Lower ash generation means lesser handling cost.

Ash: Biomass has ash content less than 10% compared to 55% in F grade coal. 

Emission Reduction: GHG emission is reduced to the extent of fossil fuel replacement by biomass.

Dust emission: Biomass preparation plant has a dust extraction system to recover and utilize the dust for boiler. 

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