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VFD Proposal for ID Fan

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VFD Proposal for ID Fan

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    1. VFD Proposal for ID Fan By Santosh Mestry , Sr. Manager (OPN)

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    6. Background : Function of ID Fan Thermal power plant has several fans such as Induced draft (ID) fans, Forced draft (FD) Fans, Primary air fans (PA fans). These fans contribute to significant auxiliary power consumption. ID fans alone contribute to about 12% of total auxiliary power consumption The function of Induced Draft fan is to suck the gases out of furnaces and push them into the stack. Boiler is provided with two nos. of Induced Draft Fans. Each ID fan is provided with regulating damper control and scoop control for controlling the loading on fans, Inlet/Outlet gates for isolation to facilitate startup/maintenance of fan.

    8. 8 Technical specification of ID Fan General specification: Application : ID Fan No per boiler : Two Type : NDZV 33 Sidor Medium handle : Flue gas Orientation : 45 degree inclined suction horizontal delivery Fan Design rating: Capacity : 258 cu.m /sec Total head developed : 496 mmwc Temp. of medium : 145 degree C Speed : 701 RPM (Max at 100% scoop) Type of Regulation :Speed & damper Drive Motor: Motor Make : BHEL- Haridwar Rating : 1850 KW Speed : 745 RPM

    9. ENERGY CONSERVATION OPPORTUNITIES

    10. Principle of Hydraulic Coupling The ID fans are controlled with VFC control. The variable fluid coupling works on the principle of hydrodynamics. It consists of an impeller and rotor(runner) enclosed in a Casing. The impeller is connected to the prime mover, while the rotor is connected to the driven machine. The coupling is filled with fluid, usually mineral oil. The speed of the driven equipment is varied by varying the quantity of fluid Supplied between the impeller and the runner. 10

    11. Principle of Hydraulic Coupling

    12. Hydraulic Coupling Losses:-

    13. Hydraulic Coupling Losses: SLIP A difference between input & output speed is essential in a fluid coupling in order to enable it to transmit torque. Difference between input & output speed is normally expressed as percentage of the input speed & refereed to as slip. 13

    14. Hyd. Loss : Heat Loss Method Total heat loss (KW) = ECW flow in m3/h x ECW Temp. Gain in C x 1000 860 Kcal/hr Hydraulic loss:- 14

    15. Validation SLIP Loss Method 15

    16. 16 Validation of Hydraulic loss by slip loss calculation

    17. Efficiency Aspect Efficiency of variable fluid coupling is= 1- slip. Fan driving system efficiency can be improved by regulating fan speed by digital Variable Frequency Drive(VFD) instead of VFC. Fan driving system efficiency ? driving= ? motor* ? VFC = ? motor*(1-slip) 17

    18. Present Efficiency Calculation Average Slip of VFC =21.86%. 18

    19. Recommendation Installing a Variable Frequency Drive for this variation in flow requirements will result in substantial energy savings. The speed of the fan can be varied to attain the desired flow. There are two options: 1. To install variable frequency drives for the ID fans with VFC in place. In this case, fan speed is varied by VFD keeping VFC scoop 100% open.Design VFC slip at scoop 100%: - 3.4% 19

    20. 2. To install variable frequency drives for the ID fans & remove VFC . In this case VFC slip loss is nil since slip =0 20

    21. Cost-Benefits: 21

    22. In DTPS, there are 4no. ID fans. Above energy saving calculation is for one fan. If cost of unit- 3.50 Rs/KWH & annual Operating Hrs. =8200 Hr, benefit & simple payback period is shown in the following table: 22

    23. Thank you

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