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 (TCTotal carbon) of raw meal (uncalcined). The CO₂ released from TC1CO2 from total carbon is used as clarification for the analytical parameters of the Detailed Input Method A2. The term "CO2 content", which is used in the Protocol Guidance Document and in the Protocol Spreadsheet, leads to misunderstandings. 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, CKDCement kiln dust 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:

• The section Raw meal in the calcination sheet contains the information on the amount of kiln feed, its correction for dust return and the analysis of the total CO₂ released from TC of the raw meal. See the additional information on the determination of dust return correction regarding input methods (A1) and (A2).
  
  Line600 to line603 calculate the calcination of raw meal consumed, in order to prevent double counting of the recycled part of the kiln feed. The corresponding amount of CO₂ is determined based on the CO₂ released from TC2CO2 from total carbon is used as clarification for the analytical parameters of the Detailed Input Method A2. The term "CO2 content", which is used in the Protocol Guidance Document and in the Protocol Spreadsheet, leads to misunderstandings. of the raw meal (RM). The complete CO₂ emissions of the raw meal must be determined. 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).
  
  
• The section Additional raw material # 1 (not part of kiln feed) (#1 - #10; # = number) contains the amount of additional raw materials and the analysis of their CO₂ released from TC.
  
  
• The section bypass dust correction for uncalcined fraction refers to the amount of bypass dust and its residual CO₂ from total carbon in the diagram.
  
  
• The section CKD leaving the kiln system in the calcination sheet refers only to the amount of cement kiln dust (CKD) and its CO₂ released from TC that is not recycled to the kiln feed in the diagram.

• Lines 671 to 676 determine the total CO₂ emissions from the calcination of raw materials (TIC) and from their organic carbon content (TOC).

Calculation Details

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

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).

The CO₂ released from inorganic carbon of the input materials and CKDCement kiln dust 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 = TICTotal inorganic carbon+TOCTotal organic carbon).

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

• See Sheet CalcA2 (Detailed Input Method)

FAQs

• See FAQs on Calcination

Line-by-Line

• See Calcination Sheet A2

See Also