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Co-firing with biomass at Edenderry Power Station

Exemption of Biomass Power Plants of capacity less than 15 MW from the need of taking Environment Clearance

Rajasthan (2015)

Biomass Resource Assessment for Haryana state

Vol 9, Issue 4- February 2016

Decentralized Application of Biomass Gasifier for thermal energy demand

Issue 6- Oct-Dec 2015

Biomass resource availability in Kerala

A Model of Fuel Supply Linkages at SLS Power, Nellore

Issue 5- July-Sept 2015

Vol 9, Issue 3- December 2015

Biomass Supply Management Using ERP Platform

Electricity Generation using Pine Needles in Uttarakhand

Amendments in the Tariff Policy

CERC approved modified procedure for implementation of REC Mechanism w.e.f. 05.11.2015

Rajasthan biomass fuel supply study 2015

Ensuring sustainable biomass supply at Malwa Biomass Power Project

Agro residue resource availability in Andaman & Nicobar

Cane trash as an alternate fuel resource for biomass cogeneration plant

Rescheduling of 2nd Renewable Energy Global Investors’ Meet & Expo (RE-INVEST) to 14 - 16 March, 2017

Biomass gasification based combined heat and power plant at Güssing, Austria

Maharashtra policy for grid connected power projects based on new and renewable energy sources – 2015

Biomass agro-residue resource availability in Tamil Nadu

Biomass agro-residue resource availability in Karnataka

Engine manufacturers for Producer Gas

Andhra Pradesh biomass resource study  

Uttarakhand biomass resource study  

CSP-Biomass hybrid plant In Spain - a case study  

Summary of Policies and Tariff for Promotion of Grid Connected Biomass Power Projects  

Tax Free Infrastructure Bonds for renewable energy
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Biomass conversion technologies

Biomass can be used for different applications such as cooking, process heating, electricity generation, steam generation and mechanical or shaft power. There are several conversion technologies that can convert biomass resources into power and heat for various potential uses. The biomass conversion processes can broadly be classified as follows:


·    Physical - Fuel processing (chopping, shredding, pulverizing, and densification into briquettes/pellets)

·    Thermo-chemical - Combustion, Pyrolysis, Gasification, Liquification, Ammonia production

·    Chemical - Acid hydrolysis

·    Biochemical - Anaerobic digestion, Ethanol fermentation


Most common biomass conversion technologies (used for meeting power generation and thermal energy requirement) in India are biomass combustion, biomass cogeneration (combined heat and power) and biomass gasification. These technologies are covered here in the Biomass Knowledge Portal. Soon biomass conversion technologies such as anaerobic digestion, ethanol fermentation, solar-biomass hybrid etc. would be covered.



Comparison of biomass conversion technologies

Parameters

Biomass Combustion

Biomass Gasification

Bagasse / Biomass Cogeneration

Process

 

Combustion is burning of biomass to produce heat via series of chemical reactions

Gasification involves burning biomass under restricted air supply for the generation of producer gas.

Cogeneration refers to the process of obtaining both heat and electricity at the same time.

Allowable moisture content of fuel

Up to 30%

Less than 15%

Up to 50%

Capacity range

Above 2 MW

Up to 2 MW

Bagasse cogeneration is feasible for sugarmill with crushing capacity of more than 2,500 tonnes per day (TCD)
For others industries, capacity depends on type of technology used and requirement of heat and electricity.

Annual Plant Load Factor (PLF)

70-80%

80-85%

45-55%

Specific fuel consumption

0.9-1.3 kg per kWh

1.2-1.5 kg per kWh for biomass
1.5-1.8 kg per kWh for rice husk

1.3-1.6 kg per kWh for bagasse cogeneration
0.9-1.2 kg per kWh for biomass cogeneration

Steam to bagasse ratio ranges from 2.20 to 2.50 according to low to high boiler pressure conditions from 45 bar to 85 bar

Typical Capacity range

10 MW

1 MW

2500 TCD

Power output at different pressures:
6 MW at 45 bar/440°C
13.5 MW at 64 bar/480°C
17 MW at 85 bar/510°C

Biomass fuel requirement (TPA)

95,000 (at 80%PLF )

~ 9,000 (at 85%PLF)

1,30,500 Tonnes bagasse
(For about 180 days operation of 2500 TCD plant)

Ash generation

  • 950 to 2800 TPA
        (for woody biomass with 1-3%
        ash content)
  • 4600 to 9300 TPA
        (For agro residues, with 5-10%
        ash content)
  • 95 to 280 TPA
        (for woody biomass with 1-3%
        ash content)
  • 470 to 930 TPA
        (For agro residues, with 5-10%
        ash content)
  • 2600 to 5200 Tonnes of bagasse
        ash from 2500 TCD plant
        considering 2-4% ash content in
        bagasse)
  • Indicative investment cost*

  • Rs 5.58 crore per MW [other
        than rice straw and juliflora
       (plantation)] with water cooled
        condensers (WCC)
  • 6.00 crore per MW [other than
        rice straw and juliflora
        (plantation) with air cooled
        condenser  (ACC)
  • Rs 6.10 crore per MW [rice
        straw and juliflora (plantation)]
        WCC with
  • Rs 6.51 crore per MW [rice
        straw and juliflora (plantation)]
        with ACC
  • Rs 5.92 crore per MW.
    Rs 4.42 crore per MW on accounting the capital subsidy of Rs 1.50 crore per MW

    Rs 4.52 crore per MW

    O & M Cost* as provided by CERC for FY 2015-16

    Rs 44.71 Lakh/MW

    Rs 18.91 Lakh/MW

    Rs 47.26 Lakh/MW

    Auxiliary consumption*

    Plants with WCC = 10%
    Plants with ACC= 12%

    8.5%

    10%

    Benefit of Accelerated Depreciation (Rs/kWh)*

  • 0.18 [other than rice straw and
         juliflora (plantation)] with WCC
  • 0.20 for project [other than rice
         straw and juliflora (plantation)]
         with ACC
  • 0.20 for project [rice straw and
         juliflora (plantation)] with WCC
  • 0.21 for project [rice straw and
         juliflora (plantation)] with ACC
  • Varies for different states

    Andhra Pradesh – 0.25
    Haryana – 0.21
    Maharashtra – 0.18
    Punjab – 0.21
    Tamil Nadu – 0.18
    Uttar Pradesh – 0.25
    Others – 0.21

    0.13

    Application of the technology

    Large scale grid connected or captive power plants

    Sub-megawatt scale grid connected, captive  and small scale decentralized power production and part load operations (gasifier can have turn down ration of 4:1)

    Industrial applications requiring both power and process heat in sugar mills and others process industries like food processing, pharmaceutical, pulp and paper, oil refinery, textiles, steel, cement, glass, ceramic, etc.

    Limitations of the technology

    Not suitable for small scale and part load operation.
    Not preferable for capacity above 10 MW due to biomass supply management issues.
    Fuel preparation as per the boiler design

    Not suitable for large MW capacity
    Not suitable for high moisture content fuels.
    Preferred to have uniform fuel woody biomass or briquettes of loose biomass or single loose fuel like paddy husk

    Bagasse based cogeneration: additional fuel requirement for non-crushing season.
    Technology selection depends on proportion of power and heat requirement.

    Technology document

    click here to read

    click here to read

    click here to read

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