Emission monitoring and reporting

Emission accounting and its monitoring in oil & gas industry is important to meet the regulatory compliance, transparency & disclosure and setting the emission reduction targets. Reduction in emission will also benefits in increased operational efficiency of the of the plant.

Emission monitoring and reporting is used to calculate CO2 emission equivalent value in each stream (Liquid/Gas). CO2 equivalent calculations are based on assumption that stream is 100 % combustible. With this CO2 emission can be calculated for flue gases and other liquids using AVEVA Production Accounting.

Emission monitoring allows you to:

• Collect all material flows and its associated carbon content data in the streams.

• Perform the emission calculations based on stoichiometry and material balances.

• Generate measured and reconciled data of CO2 equivalent carbon content for each stream.

• Carbon content shall be monitored from feed to dispatch of entire value chain of the industry.

• Simultaneous generation of emission reports along with material balance reports are feasible now.

Calculate CO2 emission equivalent

1. Open Tools->Options->Component. Define the components existed in streams and their carbon fraction.

   Note: AVEVA Production Accounting has in built 118 components library and carbon fraction, Enthalpy and Molecular weight is pre-defined for them, and user can change the value at any time.

   Add components from the library in the components list

   1. Go to Tools->Options->Component, and then in the Component List grid, select the required component.

      

   2. Click the Chemical Name column of the selected component and then select the required Chemical from drop-down list.

      

   3. Once you select the Chemical, the following confirmation message appears:

      

   4. Click Yes to get the default values of the selected chemical name, The following properties Density, Molecular Weight (MW), Heating Value and Carbon Fraction are loaded.

      

   5. You can also can add the new components and define the carbon fraction.

2. Once the components are added in component list, go to stream (Liquid/Gas). Stream contains CO2 Equivalent tab in the Results window which contains Measured CO2, Reconciled CO2 and Compensated CO2 in both Mass and Volume.

   

3. CO2 equivalent in Mass is converted into Volume by using the user-defined CO2 density value in Tools->Options->Eng. Unit.

   Note: By default, CO2 density is selected as 1.8718 kg/Nm3 at NTP conditions as shown in the screen below. You can change the CO2 density at any point and updated value will be saved.

   

4. In the Components section, specify the components existed in the stream.

5. After defining components, click OK.

6. Reopen the stream, go to Results->CO2 Equivalent. CO2 equivalent is calculated for Measured, and Reconciled values.

   Note: CO2 equivalent also supports the compensated values.

Calculate compensated value for CO2 Equivalent:

7. Go to Stream->Design Operation->Operation Tag, select the Compensation check box.

8. Once the compensation is enabled, click OK and then reopen the stream again.

9. Go to Results->CO2 Equivalent tab, the compensated CO2 equivalent is calculated now.

   Note: Measured CO2, Reconciled CO2 and Compensated CO2 calculated values are stored into database (MSACCESS/MSSQL/ORACLE).

   

Import CO2 Equivalent values from database

• You can also import the CO2 Equivalent values from database to Excel using AVEVA Production Accounting Excel add-in and by selecting stream property as MassCO2Eqv/VolCO2Eqv/ RecMassCO2Eqv/RecVolCO2Eqv/ CompMassCO2Eqv/CompVolCO2Eqv.