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AssigneeKonus-Kessel Gesellschaft fur Warmetechnik mbH & Co. KG
InventorsNiklaus Rychen, Peter Werner Fuchshuber
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In an apparatus for heating a heat transfer fluid flowing through concentrically arranged pipe coils in a boiler casing, the casing is supported on top of a furnace in which solid fuel is burned in the combustion chamber. The combustion gases flow directly from the combustion chamber into the boiler casing for passage over the pipe coils. Solid fuel is supplied by a conveyer into a grate below the combustion chamber and air is supplied to a primary combustion air chamber and a secondary combustion air chamber for flow into the combustion chamber. The heat transfer fluid is circulated through the pipe coils by a pump and, if the pump becomes inoperative or flow otherwise stops, the supply of fuel and air is automatically discontinued to avoid overheating of the heat transfer fluid.
Apparatus for using a solid fuel in heating a heat transfer fluid, such as a thermal oil, which is to be protected against overheating, comprising a boiler, means for effecting forced circulation of the heat transfer fluid through said boiler, said means for effecting forced circulation comprising an electrically operated pump, said boiler comprising a vertically arranged boiler casing forming a vertically extending passage, a pipe coil system located in said passage for flowing the heat transfer fluid therethrough, a furnace connected to said boiler for flowing heating gases into said passage for flow in indirect heat transfer relation with the heat transfer fluid within said pipe coil system, means for supplying solid fuel into said furnace, means for supplying combustion air into said furnace, an outlet connected to said casing for discharging heating gases after they flow over said pipe coil, and means for stopping the heating of said pipe coil system when the forced circulation of the heat transfer fluid stops, wherein the improvement comprises that said boiler casing is open at the bottom forming an opening into the lower end of said passage, said furnace comprises a vertically extending combustion chamber having an upper end and a lower end with said upper end thereof opening into the lower end of said passage for flowing heating gases from said combustion chamber into said passage, said furnace supporting the lower end of said boiler casing, and said means for stopping the heating of said pipe coil system being connected to said means for supplying solid fuel and to said means for supplying combustion air for rendering both of said means inoperative when the forced circulation of said heat transfer fluid is stopped.
Dependencies are inferred from the claim text.