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 Co-products TagsCo-products
GHGenius 4.00
 Co-Products Report
 October 2011
 Download | View Abstract | Hide Abstract
There were three primary tasks undertaken as part of this work. The first task was to expand the number of process chemicals that can be modelled as inputs to the various fuel production processes on the Alt Fuel Prod sheet. Recent modelling work for biodiesel plants has found that there is a significant variation in the process chemicals that are used. In addition to sodium hydroxide, some plants use potassium hydroxide or sodium methylate as the catalysts. Different acids are also used in the process. The following additional chemicals have been added to the model:
Acetic acid
Ammonium sulphate
Citric acid
Hydrochloric acid
Magnesium silicate
Nitric acid
Phosphoric acid
Potassium hydroxide
Sodium methylate

One additional change to this section of the model has been made. In some processes there is a significant amount of electricity that is used for some of the chemical inputs and the model had used generic power for the calculation of emissions for these chemicals. This meant that the chemical GHG emissions were dependent on the location where they were used and not necessarily where they were produced. This has been changed so that the user can choose between using the average Canada power, the average US power or the regional generic power for the chemical production.

The second task has been to expand the treatment of co-products in the model. Over the years, the co-products have been added on a when required basis for each new pathway. This has resulted in a somewhat inconsistent treatment of the calculation methodology. A more structured approach to calculating the energy and emissions that are displaced by the co-products has been adopted, more like the approach used on the Alt Fuel Prod sheet for the input chemicals. This should make it easier to add new co-products in the future as bio-refineries develop.

Some additional co-products, or co-product uses have been added. Some biodiesel plants are using glycerine as an animal feed, or as a source of fuel. Others are using it as a feedstock for propylene glycol production.

Some LCA models use alternate co-product allocation methods other than system expansion/displacement such as mass or energy allocation. The functionality of GHGenius has been expanded to allow the user to choose between displacement (default), mass, or energy allocation.

The third part of the update has been to re-organize some sheets. As the model developed and new pathways or functions were added, the layout of some of the sheets becomes compromised and less than ideal. Many of these compromises have been addressed.

Tags: Co-products - GHGenius 4.00
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