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Category
Title
NFR:
2.B.7
Soda ash production
SNAP:
040619
Soda ash production and use
ISIC:
Version Guidebook 2016
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Coordinator
Jeroen Kuenen
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Contents
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Overview ................................................................................................................................... 3
Description of sources ............................................................................................................... 3
2.1 Process description .............................................................................................................. 3
2.2 Techniques .......................................................................................................................... 3
2.3 Emissions and controls ........................................................................................................ 3
Methods..................................................................................................................................... 4
3.1 Choice of method ................................................................................................................ 4
3.2 Tier 1 default approach........................................................................................................ 4
3.3 Tier 2 technology-specific approach ................................................................................... 5
3.4 Tier 3 emission modelling and use of facility data .............................................................. 5
Data quality ............................................................................................................................... 5
4.1 Completeness ...................................................................................................................... 5
4.2 Avoiding double counting with other sectors ...................................................................... 5
4.3 Verification.......................................................................................................................... 5
4.4 Developing a consistent time series and recalculation ........................................................ 6
4.5 Uncertainty assessment ....................................................................................................... 6
4.6 Inventory quality assurance/quality control (QA/QC) ........................................................ 6
4.7 Gridding .............................................................................................................................. 6
4.8 Reporting and documentation.............................................................................................. 6
Glossary .................................................................................................................................... 6
References ................................................................................................................................. 7
Point of enquiry......................................................................................................................... 7
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1
Overview
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The present chapter presents a simple emission estimation method (Tier 1 only) for the production
of soda ash. Information has been taken from external sources, including the 2006 IPCC
Guidelines for National Greenhouse Gas Inventories (IPCC, 2006) and the Best Available
Technique Reference (BREF) document for large volume solid inorganic chemicals (European
Commission, 2007).
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2
Description of sources
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2.1
Process description
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Soda ash is used in a variety of applications, including glass production, soaps and detergents, flue
gas desulphurisation, chemicals, pulp and paper and other common consumer products. Soda ash
production and consumption (including sodium carbonate, Na2CO3) results in the release of
pollutants. The main pollutant is carbon dioxide (CO2) and it is good practice to report this
pollutant in compliance with the IPCC Guidelines for National Greenhouse Gas Inventories
(IPCC, 2006). On average, 200–300 kg CO2 are vented into the atmosphere per tonne of soda ash
produced.
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A more detailed description of the soda ash industry is available in the BREF document on large
solid inorganic chemicals (European Commission, 2007). This description includes an extensive
process description, present consumption and emission levels as well as information on Best
Available Techniques for this source.
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2.2
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This document does not distinguish technologies in the soda ash industry. For more information,
please refer to the BREF document (European Commission, 2007).
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2.3
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Carbon monoxide (CO) is virtually inert through the process. All CO must therefore be vented to
the atmosphere either at the kilns or through the carbonation tower after gas scrubbers. The
amount of CO released depends on the conversion of CO into CO2 (Boudouart reaction) during
the limestone calcinations step.
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During the oxidation of nitrogen in the kiln, NOx and SOx are emitted. The formation of NOx is
limited due to the moderate temperature of the combustion (approximately 1 100 °C). The
formation of SOx depends on the sulphur in the compounds and in the fuel. Emissions of NOx and
SOx must be reported under source category 1.A.2.c and the use of the combustion-related factors
in 1.A.2.c will account for the majority of the emissions.
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In addition, dust is emitted from soda ash production in limited quantities, arising from handling
and also from limestone conversion in kilns. It is common to use bag filters or wet scrubbers,
which significantly reduce the levels of dust emitted to the atmosphere.
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Measurements made in some plants indicate that more than 75 % of the dust emissions are
relatively large particles (> 10 μm) and that the contribution of PM10 is relatively low.
Techniques
Emissions and controls
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3
Methods
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3.1
Choice of method
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The present chapter only sets out a Tier 1 default approach to estimate the emissions from the
production and use of soda ash.
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3.2
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The present subsection provides default emission factors for this source category. Since it is only a
minor source of emissions and not a key category, only Tier 1 default emission factors are
provided.
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3.2.1 Algorithm
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The Tier 1 approach uses the general equation:
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E pollutant  AR production  EFpollutant
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Tier 1 default approach
(1)
where:
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Epollutant
=
the emission of the specified pollutant
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ARproduction
=
the activity rate for the soda ash production/use
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EFpollutant
=
the emission factor for this pollutant
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The Tier 1 emission factors assume an ‘averaged’ or typical technology and abatement
implementation in the country and integrate all sub-processes.
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3.2.2 Default emission factors
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The default emission factors for soda ash production are given in Table 3.1 below. These are taken
from the section on soda ash in the IPPC BREF document for large volume solid inorganic
chemicals (European Commission, 2007).
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Emission factors in the BREF documents are mostly given in ranges. The range is interpreted as
the 95 % confidence interval, while the geometric mean of this range is chosen as the value for the
emission factor in the table below.
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Table 3.1
Tier 1 emission factors for source category 2.B.7 Soda ash production
Tier 1 default emission factors
Code
NFR Source Category 2.B.7
Name
Soda ash production
Fuel
NA
Not applicable
NOx, NMVOC, SOx, Pb, Cd, Hg, As, Cr, Cu, Ni, Se, Zn, Aldrin, Chlordane,
Chlordecone, Dieldrin, Endrin, Heptachlor, Heptabromo-biphenyl, Mirex,
Toxaphene, HCH, DDT, PCB, PCDD/F, Benzo(a)pyrene,
Benzo(b)fluoranthene, Benzo(k)fluoranthene, Indeno(1,2,3-cd)pyrene, Total 4
PAHs, HCB, PCP, SCCP
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Pollutant
PM10, PM2.5, BC
Value
Unit
95% confidence
Reference
interval
CO
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NH3
0.9
kg/Mg soda ash
Lower
Upper
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20
0.6
1.5
produced
kg/Mg soda ash
(2007)
produced
TSP
0.1
kg/Mg soda ash
European Commission
European Commission
(2007)
0.1
0.15
produced
European Commission
(2007)
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Guidance on estimating emissions of NOx and SOx is given in source category 1.A.2.c
(combustion emissions from chemicals manufacturing).
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3.2.3 Activity data
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A lot of information on production statistics (for various source categories) is available from
national statistics or United Nations statistical yearbooks.
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Further guidance might also be provided in the 2006 IPCC Guidelines for National Greenhouse
Gas Inventories (IPCC, 2006).
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3.3
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Not available for this source.
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3.4
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Not available for this source.
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Data quality
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4.1
Completeness
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No specific issues.
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4.2
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No specific issues.
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4.3
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4.3.1 Best Available Technique (BAT) emission factors
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The present subsection presents Best Available Technique emission factors derived from the
BREF document for this industry, available at: http://eippcb.jrc.es/pages/FActivities.htm. The
present subsection provides associated emission levels (AELs) with the use of BAT as defined in
Tier 2 technology-specific approach
Tier 3 emission modelling and use of facility data
Avoiding double counting with other sectors
Verification
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the BREF document. These are applicable to soda ash plants in the EU-25 based on the Solvay
process.
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Table 4.1
BAT associated emission factors for source category 2.B.7 Soda ash production
Code
Name
NFR Source Category
2.B.7
Soda as h production
Fuel
NA
not applicable
SNAP (if applicable)
040619
Soda as h production and us e
Technologies/practices
Solvay proces s
Abatement
Pollutant
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Value
Unit
95% confidence interval
Lower
Upper
TSP (dry gas s treams )
10
mg / Nm3
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20
TSP (wet gas s treams )
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mg / Nm3
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4.4
Developing a consistent time series and recalculation
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No specific issues.
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4.5
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No specific issues.
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4.5.1 Emission factor uncertainties
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No specific issues.
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4.5.2 Activity data uncertainties
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No specific issues.
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4.6
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No specific issues.
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4.7
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No specific issues.
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4.8
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No specific issues.
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Uncertainty assessment
Inventory quality assurance/quality control (QA/QC)
Gridding
Reporting and documentation
Glossary
ARproduction the activity rate for the soda ash production or use
E pollutant
the emission of the specified pollutant
EF pollutant
the emission factor for this pollutant
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References
European Commission, 2007. Integrated Pollution Prevention and Control (IPPC), Reference
Document on Best Available Techniques (BREF) in Large Volume Inorganic Chemicals – Solids
and others industry, August 2007.
IPCC, 2006. 2006 IPCC Guidelines for National Greenhouse Gas Inventories. Eggleston, H.S.,
Buendia, L., Miwa, K., Ngara, T. and Tanabe, K. (eds), National Greenhouse Gas Inventories
Programme. IGES, Japan.
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Point of enquiry
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Enquiries concerning this chapter should be directed to the relevant leader(s) of the Task Force on
Emission Inventories and Projection’s expert panel on combustion and industry. Please refer to the
TFEIP website (www.tfeip-secretariat.org) for the contact details of the current expert panel
leaders.
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