HOT VAPOUR FILTER DESIGN AND OPERATION IN PDU-SCALE
The objectives of the task include:
- To install a hot
vapor filter to an existing Process Development Unit
- To verify operation of the filter in continuous operation
- To produce hot vapour filtered product oil
The tasks included are:
- To install a hot vapor filter to an existing Process Development
- To verify PDU operation after modifications
- Initial test with the HVF
- HVF pyrolysis oil production for tests and analysis
- Reporting of the HVF operation
The PDU has been operating since 1996 with a total liquid production
of more than 31 tonnes in more than 2000 h of operation.
Data concerning the PDU operation is presented in the Figures below.
Availability and operation hours for experimental runs during 1998
- 2004 are presented. Availability has been defined for each test
run as total hours in production divided by total hours planned operation
before the test. On average the availability has been during the past
years slightly below 90 %. Amount of pyrolysis oil produced during
1996-2004 is also shown below.
The PDU has been modified. First experimental run without the filter
was carried out in March 2004 to verify new equipment, measurements
The test period was between May 2004 and February 2006. The objective
for the HVF runs was to operate hot vapour filter continuously with
Auxiliary material is fed to the line before the filter to improve
filter dust removal. The primary criteria employed assessing the HVF
performance operation is the pressure drop across the filter.
The first test with a HVF was unsuccessful. During a 5-hour operation,
the pressure drop across the filter increased continuously. Back-pulsing
of the filter did not yield the desired reduction in pressure drop.
After some tests with several modifications to the system and different
operating parameters, a more successful 10 hour test was carried out
Although the filter pressure-drop increase was substantially improved
and operation was smooth, nevertheless pressure-drop increase was
The conclusion is that with the present experimental arrangement HVF
of pyrolysis vapours does not appear feasible.