초록 ▼

An asphalt heating system is comprised of a fuel fired, flue type tank heater, a heat transfer oil system for heating the oil circulated through the plant, and an electric booster heater for heating the oil and for use as a back-up heating means for the tank heater. Control means are provided for au

An asphalt heating system is comprised of a fuel fired, flue type tank heater, a heat transfer oil system for heating the oil circulated through the plant, and an electric booster heater for heating the oil and for use as a back-up heating means for the tank heater. Control means are provided for automatically activating the electric booster heater in the event of flame failure of the tank heater.

대표청구항 ▼

Apparatus for heating a fluid in storage such as asphalt or similar fluids that are viscous or solid under heated conditions and a circulating heat transfer fluid comprising: a storage tank; a fuel fired heating means mounted to extend horizontally a substantial distance within said tank for deliver

Apparatus for heating a fluid in storage such as asphalt or similar fluids that are viscous or solid under heated conditions and a circulating heat transfer fluid comprising: a storage tank; a fuel fired heating means mounted to extend horizontally a substantial distance within said tank for delivering heat to a heating zone within said tank for heating the fluid in storage; a heat transfer fluid; and a conduit means providing for the recirculating flow of said heat transfer fluid, said conduit means including a flow path within said storage tank for conducting the flow of the heat transfer fluid to the interior of said storage tank; said flow path of said conduit means being constructed and arranged to extend with said heating zone in close proximity to and in heat exchange relationship with said fuel fired heating means; the improvement comprising electric heating means constructed and arranged to heat the heat transfer fluid for maintaining a desired temperature thereof, said conduit means including an elongated portion within said tank and said electric heating means being arranged to extend within said elongated portion of said conduit means, said conduit means including a scavenger coil portion including a plurality of loops extending into the heating zone some portion of which is above the fuel fired heating means, said fuel fired heating means being located near the bottom of said tank with said elongated conduit portion being located with an elongated conduit on each side of fuel fired heating means at the bottom of the tank with said scavenger coil being located above both said fuel fired heater and said electric heating means.