Detailed Input Method (A2) - Input CO2 Balance

This method is in principle based on determining the amount of raw meal consumed and analysing the CO2 released from total carbon (TCClosed) of raw meal (uncalcined). The CO2 released from TC1 of the kiln feed can be used instead if it is demonstrated, that no systematic difference exists between both parameters, and that the complete CO2 emissions are reported, with regard to the limits of accuracy and practicality.
The detailed input method (A2) accounts for CO2 emissions from the organic carbon content (TOC) of raw materials and the calcination of bypass dust, CKDClosed leaving the kiln system.

Please also see the Protocol Guidance Document (Chapter 3.3).

The following diagram illustrates the flow of mass and dust in a cement plant.

Figure 4: Diagram of the detailed input method (A2)

The names of mass flows in the diagram directly relate to the reporting with the calcination sheet CalcA2:

Calculation Details

Equation for the detailed input method (A2) as implemented in the auxiliary sheet CalcA2:

Equation 4: Detailed Input Method (A2)

where:

In the case of using the values from a CaCO3 and MgCO3 analysis, the CO2 emissions from the total organic carbon content (TOC) of the raw materials consumed must be added manually in order to determine the correct input values for the CO2 released from TC and the "Total CO2 from raw materials" (line676) according to the detailed input method (A2).

Equation 5: Total CO2 from raw material

where:

  • fCO2 = weight fraction of carbonate CO2 (%)
  • CaCO3, MgCO3 = relative amount of elements (%)
  • Total Organic Carbon (TOC) = relative amount of organic carbon (%)
  • MCaCO3 = 100.087 g/mol (*)
  • MMgCO3 = 84.314 g/mol (*)
  • MC = 12,010 g/mol (*)
  • MCO2 = 44,010 g/mol (*)

* Please also see List of Constants and Default CO2 emission factors

The CO2 released from inorganic carbon of the input materials and CKDClosed and bypass dust leaving the kiln system can alternatively be determined from CaCO3 and MgCO3 analysis (CO2 from total inorganic carbon, TIC). In this case the CO2 emissions from the organic carbon content (TOC) of the raw materials consumed must be added manually to determining the input values for lines 602, 611, 614, 617, etc. in order to account for the complete CO2 emissions (CO2 from total carbon content TC = TICClosed+TOCClosed).

Please note:

  • The resulting "Total CO2 from raw materials" in line 671 and 676 should in any case account for CO2 emissions from the total carbon (TC, including CO2 from organic carbon) content of raw materials according to the detailed input method (A2).
  • CO2 emissions from TIC and TOC of additional raw materials (ARMClosed), which are not part of the kiln feed, should be accounted for by filling in lines 610 to 639 as appropriate.
  • The CO2 emissions from the organic carbon content (TOC) of additional raw materials are correctly accounted for in lines 610 to 639 by specifying the complete CO2 emissions.
  • As for raw meal, this can be done e.g. by total carbon (TC) analysis (or CO2 IR-analysis of the gases released from the heated and fully oxidised sample).

Adjustments to the concept of the input method: In special cases an adjustment of the concept of the input methods might be necessary in order to reflect certain material flows in a plant and to ensure that they are correctly accounted for. In this case, the corresponding adjustments should be made in a customised auxiliary sheet, not in the plant sheet. The adjustments should be explained, and accompanied by an overview of all relevant material flows. Furthermore it should be demonstrated that CO2 emissions from the complete and partial calcination of raw materials and from the organic carbon content of raw materials are completely and more accurately accounted for by the adjusted method.

Please also see the Protocol Guidance Document (Chapter 3.3).
An alternative method of accounting for CO2 emissions from additional raw materials with very high organic carbon content (TOC) is described in the Protocol Guidance Document.

Where to put the results from the calcination sheet

Please see task Integrate the results of the Calcination sheet into the Plant sheet for further information on how to transfer the results from the output line(s) of your calculation from a calcination sheet into the corresponding Plant sheet.

Please note that the calcination sheet(s) will not be checked by the automatic validation tool.

Sheets

FAQs

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