use of commingling to avoid propane addition at biomethane injection points
DESCRIPTION
Use of commingling to avoid propane addition at biomethane injection points. Objective of the measurement regime for CV Protect downstream customers Comply with Gas (Calculation of Thermal Energy) Regulations - PowerPoint PPT PresentationTRANSCRIPT
1
Use of commingling to avoid propane addition at biomethane injection points
Objective of the measurement regime for CV
Protect downstream customers
Comply with Gas (Calculation of Thermal Energy) Regulations
At suitable locations where sufficient gas grid flow exists, commingling may be sufficient to produce a blended CV that does not trigger CV “cap”
CV of “pure” biomethane flow measured and used to establish energy content of gas input (and for RHI purposes) but not for testing against the local network CV re triggering CV cap
CV of commingled flow measured downstream of blending point and tested against network CV for purposes of CV cap
3
Example of how this works in practice – based on Adnams
Biomethane flow CV = 36.6 MJ/m3 (120 m3/h max)
Network FWACV = 39.6 MJ/m3
Minimum flow to blending point = 5 * BM flow
Worst case blended CV = 39.1 MJ/m3
This is 0.5 MJ/m3 less than Network FWACV; does not trigger cap
If biomethane flow were included in area FWACV calculation, it would have negligible effect on FWACV
No consumers supplied with gas prior to blending
4
Conclusions
Blending and remote CV monitoring can in some cases avoid the need for propane addition
In other cases blending can limit the period for which propane addition is required (and/or the volume of propane to be input) to periods of low network flow
Financial benefit to biomethane producer
Environmental benefit from mitigating fossil fuel addition
GDNs should be incentivised to identify and implement commingling opportunities