Cel
LOW CALORIFIC VALUE WASTE GASES ARE OFTEN PRODUCED AS A BY-PRODUCT OF INDUSTRIAL PROCESSES (E.G. THE OFF GASES FROM THE MANUFACTURE OF CARBON BLACK AND SMOKELESS FUELS). THESE ARE REGARDED AS A NUISANCE AND ARE FREQUENTLY DISPOSED OF BY INCINERATION. THIS REQUIRES, IN MANY CASES, THE ADDITION OF PREMIUM FUEL TO ENSURE STABLE COMBUSTION. HOWEVER, THESE GASES CAN BE DISPOSED OF MORE COST-EFFECTIVELY IN A SYSTEM WHICH UTILISES THEIR INHERENT POTENTIAL AS A LOW GRADE FUEL. (IN THE UK, IT IS ESTIMATED THAT 0.5 MILLION TOE PER ANNUM OF WASTE GAS ARE PRODUCED).
THE OBJECTIVE OF THIS PROJECT IS TO DEMONSTRATE THE CAPABILITY OF SWIRL BURNER/FURNACE SYSTEMS TO EFFICIENTLY BURN AN RECOVER HEAT FROM LOW CALORIFIC VALUE GASES. (A PREVIOUS STUDY INDICATED THAT A SWIRL BURNER IS WELL SUITED TO THIS APPLICATION WHILE COMMERCIAL BURNERS WOULD NOT OPERATE IN THIS CASE).
SWIRL BURNER/FURNACE SYSTEMS OF 100 KW HAVE BEEN OPTIMISED BOTH BY LABORATORY AND INDUSTRIAL TRIALS :
-THE LABORATORY TRIALS HAVE ENABLED FOUR REGIONS IN THE FURNACE TO BE DEFINED. THE MAIN REACTION REGION IS OF MOST SIGNIFICANCE AS THE MAJORITY OF HEAT RELEASE OCCURS WITHIN IT. THE RATE OF HEAT RELEASE IS DEPENDENT ON THE FLOW IN THE SWIRL REGION. THE FLOW IN THIS REGION IS SIMILAR TO THAT FOUND IN SWIRL BURNERS AND DICTATES THE PRESSURE LOSS THROUGH THE SYSTEM.
-THE INDUSTRIAL TRIALS HAVE BEEN ON THE INCINERATION OF THE WASTE GAS PRODUCED DURING THE DISCHARGE FROM THE OVENS AT THE NATIONAL SMOKELESS FUELS LTD.'S PHURNACITE PLANT. THESE HAVE SHOWN THE POTENTIAL OF SUCH SYSTEMS TO INCINERATE LOW C.V. GASES UTILISING THEIR OWN INHERENT POTENTIAL AS FUEL. THIS PART OF THE PROJECT HAS ALSO LED TO THE DEVELOPMENT OF AUTOMATIC CONTROL SYSTEMS TO ENSURE EFFICIENT MATCHING OF THE AIR AND SUPPORT FUEL REQUIREMENTS TO MINIMISE FUEL CONSUMPTION WHILE RETAINING EFFICIENT COMBUSTION.. (THE UNIT CONSUMED LESS THAN 12 % OF THE SUPPORT FUEL REQUIRED BY THE EXISTING FLAMESTACK SYSTEM).
THE RESULTING FURNACE IS CONSIDERABLY SHORTER THAN THOSE PREVIOUSLY USED FOR THIS PURPOSE, THUS REDUCING (BY ABOUT 50 %) THE CAPITAL COSTS OF AN INSTALLATION. IT HAS BEEN DEVELOPED INTO A COMPACT LIGHTWEIGHT UNIT WITH THE CLEAN HIGH TEMPERATURE EXHAUST GASES BEING ABLE TO BE USED FOR PROCESS HEATING. A COMMERCIAL SCALE UNIT OF 1 MW IS CURRENTLY BEING CONSTRUCTED IN THE UNIVERSITY.
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CF2 1TA Cardiff
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