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BI Comb SGM.GB

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3. FEED SYSTEM3.1 SOLID FUELThe Bi <strong>Comb</strong> Sgm boiler is fitted with an FM series mechanicalstoker, which is calibrated during the initial testing andinspection phase. A storage hopper, placed above, feeds theboiler. The hopper must however be fed in automatic mode.3.1.1 AUTOMATIC HOPPER FEED SYSTEMSTwo diagrams are enclosed which illustrate two traditionalsolutions; the screw system is the more simple, yet can beused only for silos installed near the heating plant, while thepneumatic system can cover large distances. The conveyingsystem receives the signal to start from the level controllersfitted on the hopper, and must guarantee a feed flow rate of atleast 30% more than the maximum power consumption of theboiler, which is calculated using the formula:FEED FLOW RATE =kcal/h DELIVEREDPs x PCI x 0,8x 1,3 = m 3 /hPs = Specific weight - kg/m 3PCI = Heat power (varies from 3000-5000 kcal/kg)Fig. 1 - SCREW SYSTEMFig. 2 - PNEUMATIC SYSTEM1 Silo2 Extractor and dosing device3 Radial valve4 Conveying screw5 Grinder6 Pneumatic conveying fan7 Check valve8 Passage indicator9 Decanter dust separator10 Sleeve filter11 Radial valve12 Mechanical stoker13 Boiler6

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