Gaseous fuel control system and apparatus for furnaces

Claim 1

AN APPARATUS FOR THE CONTROL OF THE GASEOUS FUELBLAST AIR FLOW IN A FURNACE PROVIDED WITH A BUSTLE PIPE AND A TUYERE LOCATED ON THE SIDE OF THE FURNACE SO AS TO PERMIT HEATED BLAST GASES TO FLOW THROUGH THE BUSTLE PIPE AND INTO THE TUYERE FOR INJECTION INTO THE FURNACE, WHICH APPARATUS COMPRISES IN COMBINATION: A FUEL SOURCE; A GAS RING MANIFOLD FED BY THE FUEL SOURCE; FUEL INJECTION PIPE COMMUNICATING WITH THE RING MANIFOLD WHEREBY WHEREBY GASEOUS FUEL IS ALLOWED TO FLOW FROM THE RING MANIFOLD INTO SAID INJECTION PIPE; MEANS TO MEASURE THE BLAST AIR TEMPERATURE; A BLAST AIR FLOW RECORDER-CONTROLLER; A FUEL RECORDER-CONTROLLER; A DIFFERENTIAL PRESSURE RECORDER-CONTROLLER, WHICH CONTROLLER MONITORS THE PRESSURE DIFFERENTIAL BETWEEN THE AIR BLAST OF THE BUSTLE PIPE AND THE FUEL IN THE RING MANIFOLD; A CONTROL RELAY WHICH IS INTERLOCKED WITH THE BLAST AIR, FUEL FLOW AND DIFFERENTIAL PRESSURE RECORDER-CONTROLLERS AND THE TEMEPRATURE MEASURING MEANS; MEANS TO MONITOR THE RECORDINGS OF THE RECORDER-CONTROLLERS AND TEMPERATURE MEASURING MEANS TO THE CONTROL RELAY; MEANS WHEREBY SAID CONTROL RELAY ACTUATES THE FUEL CONTROLLER AND STOPS FUEL FLOW WHEN ONE OF THE FOLLOWING FUNCTIONS OCCURS; (A) UPON REDUCTION IN THE BLAST AIR TEMPERATURE TO ANY PREDETERMINED VALUE; (B) UPON REDUCTION OF THE BLAST AIR FLOW TO ANY PREDETERMINED VALUE; AND (C) UPON REDUCTION OF THE GAS PRESSURE IN THE RING MANIFOLD TO ANY PREDETERMINED POSITIVE PRESSURE DIFFERENTIAL FROM THAT OF THE BLAST AIR IN THE BUSTLE PIPE.

Claim 2

AN APPARATUS FOR THE CONTROL OF THE GASEOUS FUELBLAST AIR FLOW IN A FURNACE PROVIDED WITH A BUSTLE PIPE AND A TUYERE LOCATED ON THE SIDE OF THE FURNACE SO AS TO PERMIT HEATED BLAST GASES TO FLOW THROUGH THE BUSTLE PIPE AND INTO THE TUYERE FOR INJECTION INTO THE FURNACE, WHICH APPARATUS COMPRISES IN COMBINATION: A FUEL SOURCE; A GAS RING MANIFOLD FED BY THE FUEL SOURCE; FUEL INJECTION PIPE COMMUNICATING WITH THE RING MANIFOLD WHEREBY WHEREBY GASEOUS FUEL IS ALLOWED TO FLOW FROM THE RING MANIFOLD INTO SAID INJECTION PIPE; MEANS TO MEASURE THE BLAST AIR TEMPERATURE; A BLAST AIR FLOW RECORDER-CONTROLLER; A FUEL RECORDER-CONTROLLER; A DIFFERENTIAL PRESSURE RECORDER-CONTROLLER, WHICH CONTROLLER MONITORS THE PRESSURE DIFFERENTIAL BETWEEN THE AIR BLAST OF THE BUSTLE PIPE AND THE FUEL IN THE RING MANIFOLD; A CONTROL RELAY WHICH IS INTERLOCKED WITH THE BLAST AIR, FUEL FLOW AND DIFFERENTIAL PRESSURE RECORDER-CONTROLLERS AND THE TEMEPRATURE MEASURING MEANS; MEANS TO MONITOR THE RECORDINGS OF THE RECORDER-CONTROLLERS AND TEMPERATURE MEASURING MEANS TO THE CONTROL RELAY; MEANS WHEREBY SAID CONTROL RELAY ACTUATES THE FUEL CONTROLLER AND STOPS FUEL FLOW WHEN ONE OF THE FOLLOWING FUNCTIONS OCCURS; (A) UPON REDUCTION IN THE BLAST AIR TEMPERATURE TO ANY PREDETERMINED VALUE; (B) UPON REDUCTION OF THE BLAST AIR FLOW TO ANY PREDETERMINED VALUE; AND (C) UPON REDUCTION OF THE GAS PRESSURE IN THE RING MANIFOLD TO ANY PREDETERMINED POSITIVE PRESSURE DIFFERENTIAL FROM THAT OF THE BLAST AIR IN THE BUSTLE PIPE.