Mass Balance of a Kiln System

The following diagram illustrates an example of the mass flows in a cement plant and the mass balance of a kiln system from raw meal (RM) to clinker.

Figure 2: Schematic diagram of material and dust flows in a cement plant

The reporting of CO2 emissions from the calcination of raw materials depends on the principle choice of the method for determining the mass balance: 1. from the input side (raw meal consumption) or 2. from the output side (clinker production).

Accordingly, you need to consider the reporting of the mass flows Bypass dustClosed, cement kiln dust (CKDClosed) leaving the kiln system (and crossing the red boundary in the diagram) and additional raw materials (ARMClosed), which are not part of the normal kiln feed, as follows:

1. Simple input method (A1) and detailed input method (A2): The actual amount of raw meal consumed for clinker production can be determined by weighing the kiln feed and subtracting the Dust returnClosed.

2. Simple output method (B1) and detailed output method (B2): The amount of clinker production can be determined from calculating the clinker mass balance (see Clinker and Cement Production) or by direct weighing.