| OCR Text |
Show From in excess of 20 years experience it is possible for the Model Test Room staff to apply splitter plates, baffles and turning vanes to the model that will immediately improve the flow paths without increasing the system resistance. It is then necessary to "fine tune" the splitters etc. to achieve equal air distribution to the burners and ' ensure that the burners are presented with the air flow for which they were originally designed. The "fine tuning" is achieved by repetition and a combination of air flow and water flow tests as described previously. As can be imagined the number of tests required on a large multi-burner installation can be impressive. Experience has shown that if a flow discrepancy of less than ± 2% can be achieved on the model and providing the combustion air is supplied to the burners correctly then the basis for optimum combustion efficiency and minimum pollution is established. This of course presupposes that the original burners were actually capable of such operation with the optimum supply conditions. If not change the burners. Many hundreds of models have been tested in the manner described above and in every case the benefits achieved have been most impressive on systems that were originally designed without sufficient thought as to the basic concept of fluid flow. The techniques have been applied to combustion systems incorporating practically every type of burner design, including axial flow suspended flame, high intensity, vortex combustion, swirl flow etc and for all types of fossil fuels. - 11 - |
