Method and arrangement for handling vent gas mixture

An arrangement for handling a vent gas mixture comprising fuel vapours of a fuel and inert gas, the vent gas mixture originating from a fuel system, the arrangement comprising:

• a boiler system, and
• a vent gas handling system,
• wherein the boiler system comprises
• a burner, and
• a fuel inlet configured to selectively supply a fuel and thereby selectively sustain a primary flame in the burner for production of heat and/or steam in the boiler system,
• wherein the vent gas handling system comprises
• a condenser for condensing the fuel vapours in gas phase into liquid fuel, and
• a vapour-liquid separator for separating the liquid fuel and the inert gas,
• wherein the arrangement further comprises piping configured to
• direct the vent gas mixture from the fuel system to the condenser condensing the fuel vapours into liquid fuel such that the vent gas mixture comprises liquid fuel and inert gas,
• direct the vent gas mixture from the condenser to the vapour-liquid separator separating the liquid fuel and the inert gas, and
• selectively direct the liquid fuel from the vapour-liquid separator to the boiler system, when the boiler system is in a hot condition and is ready to receive and combust the liquid fuel of the vent gas mixture, or
• store the liquid fuel in the vapour-liquid separator and/or in a separate storage tank until the boiler system is in the hot condition and is ready to receive and combust the liquid fuel of the vent gas mixture.