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3 PT/03/BD1076/R Revision 2 There are two methods of determining the amount of coal entering the boiler at Plant Hammond. Plant Hammond is equipped with Stock Gravimetric feeders that provide a real time estimate of the coal delivered to the furnace. Alternatively a coal weight is available from the conveyor belts delivering coal to the storage bunkers. This however is only viable over a long period of time while the unit is operating at a steady load. During the testing both these measurements of coal flow have been compared to the coal flow estimated from the gas analysis and ash collection rate. In general there was slightly better agreement between the belt and feed estimates than the emissions, Fig 4.5 shows some typical results for a variation in electrical load of the unit. This on-line heat rate calculation uses 16 off-line data values and 29 inputs from the operating unit to predict the following four quantities: Air heater leakage Coal Flow rate Heat Rate (Net) Stack flow rate Currently this package is not an optimiser and thus does not recommend settings for any of the on-line inputs that will optimise the heat rate. Changes though to any of the 29 inputs by any of the other optimisers will affect the plant efficiency. This provides a detailed calculation of the effect upon the plant efficiency. A comparison of a daily calculated on-line heat rate to an accurate assessment is shown in Fig 4.6. It can be seen that the on-line calculation does not exhibit the same variability as is expected for plant operation during that day. It is clear that a significant part of the project has been devoted to developing the on-line heat rate calculation. Development of an on-line heat rate calculation is an ambitious target though it would seem from the results shown in Fig 4.6 that the model predictions are not yet satisfactory.
FD FAN CEMS 4 PT/03/BD1076/R Revision 2 TEMPERING AIR COAL RADIATION PRIMARY AIR PULVERIZERS SECONDARY AIR AIR PREHEATER 2. LEAKAGE (CO2 & SO2 3. STACK ID FAN AIR PREHEATER INDEX OF NUMBERS USED: 1. HOT REHEAT 3. MAIN STEAM 2. COLD REHEAT 4. FEED WATER FLUE GAS + FLY ASH O2 & CO Figure 4.1 - Schematic Of Air Flow Through The Boiler Used By The Heat Rate Calculation B O I L E R BOTTOM ASH 1. 4.
Page 1: Advanced Optimisation - Coal Fired
Page 5 and 6: Power Technology E.ON UK plc, Ratcl
Page 7 and 8: CONTENTS PT/03/BD1076/R Revision 2
Page 9: 3 INDIVIDUAL OPTIMISERS 2 PT/03/BD1
Page 13 and 14: NO 6 PT/03/BD1076/R Revision 2 Step
Page 15 and 16: 8 PT/03/BD1076/R Revision 2 Figure
Page 17 and 18: 10 PT/03/BD1076/R Revision 2 temper
Page 19 and 20: Testing to confirm performance Inte
Page 21 and 22: Operating Data Coal Properties (up
Page 23 and 24: 16 PT/03/BD1076/R Revision 2 FIGURE
Page 25 and 26: 18 PT/03/BD1076/R Revision 2 opt.op
Page 27 and 28: As an example the following values
Page 29 and 30: 22 PT/03/BD1076/R Revision 2 6. The
Page 31 and 32: 24 PT/03/BD1076/R Revision 2 have a
Page 33 and 34: 26 PT/03/BD1076/R Revision 2 Gadira
Page 35 and 36: Optimiser 1 DCS Real Time Database

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