Pyrolysis vapour condenser system and method of condensing pyrolysis vapour

A pyrolysis vapour condenser system, comprising:

• a pyrolysis reactor pyrolyzing biomass, the pyrolysis reactor configured to have a variable rate of pyrolysis expressed in amount of material pyrolyzed per unit of time;
• and
• a condenser vessel, comprising a vapour inlet for feeding pyrolysis vapour from the pyrolysis reactor to be condensed into the condenser vessel, wherein the vapour inlet comprises a tube section defining a longitudinal direction;
• and
• a cleaning device for removing deposits from the vapour inlet, deposited thereon during a pyrolysis vapour condensation process, and thereby cleaning said inlet,
• characterized in that the cleaning device is moveable between a cleaning position, in which it is disposed at least partially in the vapour inlet for cleaning it, and a retracted position, in which the cleaning device is retracted away from the vapour inlet towards the condenser vessel,
• wherein the pyrolysis vapour condenser system is further configured to temporarily reduce the input rate of pyrolysis vapour at least during cleaning of the vapour inlet by reducing the rate of pyrolysis by pyrolyzing less material per unit of time in the pyrolysis reactor, thereby avoiding or reducing a build-up of pressure during said cleaning.