JCM_ID_AM009_ver02.0
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Joint Crediting Mechanism Approved Methodology ID_AM009“Replacement of conventional burners with regenerative burners for aluminum holdingfurnaces”
A. Title of the methodology
Replacement of conventional burners with regenerative burners for aluminum holding furnaces,ver. 2.0

B. Terms and definitions
Terms

Definitions

Regenerative burner

Burner systems which absorb exhaust gas heat to a reservoir andpreheat combustion air using the absorbed heat in the reservoir toimprove energy efficiency.

Conventional burner

Burner systems which do not have combustion air preheating facility.

Periodical check

Periodical investigation of furnace done by manufacturer or agent
who is authorized by the manufacturer, in order to maintain furnace
performance.

C. Summary of the methodology
Items
GHG

emissionmeasures

Summary
reduction By replacing conventional burners with regenerative burners foraluminum holding furnaces, consumption of natural gas isreduced, which leads to the reduction of GHG emissions.

Calculationofemissions

reference Reference emissions are the CO2 emissions from the use ofreference burners in an aluminum holding furnace, which arecalculated based on the consumption of natural gas in the
project furnace and energy efficiency of the reference andproject burners.

Calculation
emissionsofproject Project emissions are the CO2 emissions from the use of projectburners in an aluminum holding furnace, which are calculated
based on the consumption of natural gas and electricity in the
project furnace.

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Items
Monitoring parameters

Summary-

Consumption of natural gas by the project furnace-

The number of operating days

D. Eligibility criteria
This methodology is applicable to projects that satisfy all of the following criteria.
Criterion 1

The project replaces conventional burners with regenerative burners foraluminum holding furnaces.

Criterion 2

Holding temperature of aluminum melt, which is determined in the furnaceuser’s specification, is within the range from 600 to 800 degrees Celsius.

Criterion 3

The regenerative burners have a structure which leads all exhaust gas to flow
through the heat reservoir before discharging it into the atmosphere.

Criterion 4

Periodical check is planned at least once a year.

E. Emission Sources and GHG types
Reference emissions
Emission sources

GHG typesCombustion of natural gas in the reference furnace

CO2

Project emissions
Emission sources

GHG types

Combustion of natural gas in the project furnace

CO2Power consumption by the project furnace

CO2

F. Establishment and calculation of reference emissions
F.1. Establishment of reference emissions
The methodology results in conservative calculation of emission reductions and ensures net
reduction of emissions by the following approaches:
1. Setting energy efficiencies of burners in a conservative manner
It can be said that the energy efficiency of burners increases as the exhaust gas temperature falls(and vice versa), since high exhaust gas temperature means that heat is released without being
used. In this methodology, the energy efficiencies are set as default values by assuming theI-2

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exhaust gas temperature conservatively.
For the reference burner, the exhaust gas temperature is set as 750 degrees Celsius. When theholding temperature is designed to be within the range from 600 to 800 degrees Celsius, theactual furnace atmospheric temperature is generally in the range of 750 to 950 degrees Celsius.
Therefore, for the reference burner, the exhaust gas temperature is assumed to be equal to thelower end of furnace atmospheric temperature for the sake of conservativeness.
For the project burner, the exhaust gas temperature is set as 300 degrees Celsius. When theholding temperature is designed to be within the range from 600 to 800 degrees Celsius, theactual furnace atmospheric temperature is generally in the range of 750 to 950 degrees Celsius
for project burner, too. In addition, for the project burner, the exhaust gas temperature is lower
than the furnace atmospheric temperature due to the heat absorber; when the furnace
atmospheric temperature is in the range of 750 to 950 degrees Celsius, the possible temperatureof the project exhaust gas is less than 300 degrees Celsius. Therefore, for the project burner, theexhaust gas temperature is set as the upper end of the possible exhaust gas temperature for thesake of conservativeness.
Therefore, this methodology results in the conservative calculation of reference emissions byassuming the lower reference exhaust gas temperature and the higher project exhaust gas
temperature in setting the burner efficiencies.
2. Omitting reference power consumption
Although electricity is used in the reference furnace, CO2 emissions from power consumption
are not included in the reference emissions for the purpose of ensuring simplicity andconservativeness.

F.2. Calculation of reference emissions
Reference emissions are calculated as follows:

Where:
REp

Reference emissions during the period p [tCO2/p]

FCPJ,NG,i,pConsumption of natural gas by the project furnace i during the period p [Nm3/p]

ηPJ,iEnergy efficiency of the project burner of the project furnace i [-]I-3

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ηRE,iEnergy efficiency of the reference burner of the project furnace i [-]NCVNG

Net calorific value of natural gas [GJ/Nm3]EFNG

CO2 emission factor of natural gas [tCO2/GJ]

G. Calculation of project emissions
Project emissions are calculated as follows:

Where:
PEp

Project emissions during the period p [tCO2/p]

PENG,p

Project emissions from natural gas consumption during the period p [tCO2/p]

PEelec,p

Project emissions from electricity consumption during the period p [tCO2/p]

Where:
PENG,pProject emissions from natural gas consumption during the period p [tCO2/p]

FCPJ,NG,i,pConsumption of natural gas by the project furnace i during the period p [Nm3/p]

NCVNG

Net calorific value of natural gas [GJ/Nm3]EFNG

CO2 emission factor of natural gas [tCO2/GJ]

Where:
PEelec,p

Project emissions during the period p (from electricity) [tCO2/ p]

ECPJ,pConsumption of electricity by the project furnace during the period p [MWh/ p]

EFelecCO2 emission factor for consumed electricity [tCO2/MWh]

Where:
ECPJ,pConsumption of electricity by the project furnace during the period p [MWh/p]

RCCAP,iThe total maximum rated capacity of auxiliary equipment of the project furnace i[W]Dop,i,pThe number of operating days of the project furnace i during the period p [day/p]

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H. Calculation of emissions reductions
Emissions reductions are calculated as follows:

Where:
ERp

Emissions reductions during the period p [tCO2/ p]

REp

Reference emissions during the period p [tCO2/ p]

PEp

Project emissions during the period p [tCO2/ p]

I. Data and parameters fixed ex ante
The source of each data and parameter fixed ex ante is listed as below.
Parameter
NCVNG

Description of dataSource

Net calorific value of natural gas

IPCC Special Report on Carbon

3[GJ/Nm ]dioxide Capture and Storage, Annex

The IPCC value is converted by gas

I, Table AI.10. Lower Heating Valuecomposition and molecular weight.

(LHV) is applied.

The default value for NCVNG is set as0.036659 GJ/Nm3.
EFNG

CO2 emission factor of natural gas

Country specific data or IPCC default[tCO2/GJ]

value from “2006 IPCC GuidelinesforNational

Greenhouse

Gas

Inventory”.
Lower limit value of the default CO2
emission factor is applied.
ηRE,iEnergy efficiency of the reference burnerof the project furnace i [-]The project-specific value is calculated by
the equation in explanatory note 1 using
the recommended operational value of air

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See explanatory note 1.

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Parameter

Description of data

Sourceratio in the manual of the project burner.
ηPJ,iEnergy efficiency of the project burner ofSee explanatory note 2.

the project furnace i [-]The project-specific value is calculated by
the equation in explanatory note 2 using
the recommended operational value of air
ratio in the manual of the project burner.
mrAir ratio for the reference burner

The recommended operational value
in the manual of the project burner

The same value as air ratio for the projectburner (mp) is applied.
mp

Air ratio for the project burner

The recommended operational value
in the manual of the project burner

EFelecCO2 emission factor for consumed[Grid electricity]

electricity.

The data is sourced from “Emission

When the project furnace consumes only

Factors of Electricity Interconnection

grid electricity or captive electricity, theSystems”, National Committee on

project participant applies the CO2

Clean Development Mechanism

emission factor respectively.

(Indonesian DNA for CDM), based

When the project furnace may consume

on data obtained by Directorate

both grid electricity and captive

General of Electricity, Ministry ofelectricity, the project participant applies

Energy and Mineral Resources,

the CO2 emission factor with lower value.

Indonesia, unless otherwise instructedby the Joint Committee.

[CO2 emission factor][Captive electricity]

For grid electricity: The most recent value

CDM approved small scale

available from the source stated in thismethodology AMS-I.Atable at the time of validation
For captive electricity: 0.8* [tCO2/MWh]*The most recent value available from
CDM approved small scale methodology
AMS-I.A at the time of validation isapplied.
RCCAP,iThe total maximum rated capacity ofSpecification or nameplate of

auxiliary equipment of the project furnace

auxiliary equipment of the projectI-6

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Parameter

Description of dataSource[W]furnaceI-7

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ηRE =NCVNG - [GwNG * c1,r * (T1,r - T2) + A0,NG * (mr - 1) * c2,r * (T1,r - T2)]
NCVNG

Where:
ηRE

Energy efficiency of the reference burner [-]NCVNG

Net calorific value of natural gas: the default value for NCV NG is set as 36,659[kJ/Nm3] based on IPCC Special Report on Carbon dioxide Capture and Storage,
Annex I, Table AI.10, and it is converted by gas composition and molecular weight.

GwNG

Theoretical volume of wet exhaust gas from combustion of natural gas: the default
value for GwNG is set as 10.694 [Nm3/Nm3] based on the assumed natural gas
composition of CH4: 94.4%, C2H6: 3.1%, C8H8: 0.5%, and C4H10: 0.2% based on
IPCC Special Report on Carbon dioxide Capture and Storage, Annex I, Table
AI.10.

c1,rAverage specific heat at constant pressure of wet exhaust gas of natural gas, at thereference temperature of exhaust gas: the default value for c1,r is set as 1.455 [kJ/Nm3･degree Celsius] based on the aforementioned natural gas composition and JIS
G 0702, Appendix Table 2 (linear prediction is used for the estimation).

T1,rReference temperature of exhaust gas: the default value for T1,r is set as 750[degrees Celsius].

T2

Ambient temperature (annual average in Jakarta): the default value for T2 is set as32.6 [degrees Celsius].

A0,NG

Theoretical amount of air of the natural gas: the default value for A0,NG is set as
9.688 [Nm3/Nm3] based on the aforementioned natural gas composition.

mrAir ratio for the reference burner: the same value as air ratio for the project burner(mp) applied.

c2,rAverage specific heat at constant pressure of air, at the reference temperature of
exhaust gas: the default values for c2,r is set as 1.380 [kJ/ Nm3･degree Celsius]
based on the aforementioned natural gas composition and JIS G 0702, Appendix
Table 2 (Linear prediction is used for the estimation).

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ηPJ =NCVNG - [GwNG * c1,p * (T1,p - T2) + A0,NG * (mp - 1) * c2,p * (T1,p - T2)]
NCVNG

Where:
ηPJ

Energy efficiency of the reference burner [-]NCVNG

Net calorific value of natural gas: the default value for NCVNG is set as 36,659[kJ/Nm3] based on IPCC Special Report on Carbon dioxide Capture and Storage,
Annex I, Table AI.10, and it is converted by gas composition and molecular weight.

GwNG

Theoretical volume of wet exhaust gas from combustion of natural gas: the default
value for GwNG is set as 10.694 [Nm3/Nm3] based on the assumed natural gas
composition of CH4: 94.4%, C2H6: 3.1%, C8H8: 0.5%, and C4H10: 0.2% based on
IPCC Special Report on Carbon dioxide Capture and Storage, Annex I, Table
AI.10.

c1,pAverage specific heat at constant pressure of wet exhaust gas of natural gas, at theproject temperature of exhaust gas: the default value for c 1,p is set as 1.368 [kJ/Nm3･degree Celsius] based on the aforementioned natural gas composition and JISG 0702, Appendix Table 2 (linear prediction is used for the estimation).

T1,pProject temperature of exhaust gas: the default value for T1,p is set as 300 [degreesCelsius].

T2

Ambient temperature (annual average in Jakarta): the default value for T2 is set as32.6 [degrees Celsius].

A0,NG

Theoretical amount of air of the natural gas: the default value for A0,NG is set as
9.688 [Nm3/Nm3] based on the aforementioned natural gas composition.

mp

Air ratio for the project burner: the recommended operational value in the manualof the project burner.

c2,pAverage specific heat at constant pressure of air, at the project temperature of
exhaust gas: the default values for c2,p is set as 1.319 [GJ/Nm3･degree Celsius]
based on the aforementioned natural gas composition and JIS G 0702, Appendix
Table 2 (Linear prediction is used for the estimation).

History of the document
Version02.0

Date
10 February 2017

Contents revised
JC6, Annex 4
Revisions to: Change the description of energy efficiency of thereference burner of the project furnace i in Section I.
 Change the description of air ratio for the reference

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6 August 2015burner (mr) in Section I and Explanatory note 1; and Change the status of parameter “air ratio for the referenceburner” from default value to a parameter fixed ex ante in
the Monitoring Spreadsheet.
Electronic decision by the Joint Committee
Initial approval.

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