Limbaja Energy

Fan Study

Fan Study

Overview

The fans are tested for field performance by measurement of flow, head, temperature on the fan side and electrical motor kW input on the motor side. The air velocity was measured by using anemometer. Multiplication of air velocity with the inlet area gives the air flow.

Formulas

Fan Static Efficiency (η) can be calculated by the formula:

  • Fan Static Efficiency (η) = (Volume (m3/s) * ∆p (Total Pressure) mmWC) / (102 * Power Input to Fan Shaft in kW)

Scope of Work

Measurement and Analysis of Fan operating parameters like power consumption, flow rate, head developed & operational sequence.
Comparison of operating efficiency with rated /design efficiency, actual head required vs. operational head.
Identification and suggestions for performance improvement and energy saving potential.
Study of Fan operation/control with respect to variation in operating head/flow due to variation process area requirement to find opportunity for minimizing pumping power.

Case Study: Energy conservation Measures : VFD Controlling System Instead Of Damper Controlling At Plant Mill ID Fan

SNParameterUnitValue
1Power Consumption of blowerkW96.5
2% of throttling at suction valve%50.0
3% of saving Possible%30.0
4Saving powerkW28.9
5Opt. Hr/dayHr24.0
6Unit cost RsRs./kWh8.10
7Annual operation DayDay300.0
8Annual Power SavingkWh208393.0
9Annual Monetary savingRs.1687983.5
10InvestmentRs.Nil
11Simple Payback PeriodMonthImmediate

Mill Blower Trial Data

Take trial at Mill Blower suction damper 50 % throttling and full open Condition.
VFD Already install in the Mill ID Fan.
Pressure data show in the below table and figure.
Mill Blower power is very with product, Mill frequency & Whizzer Frequency.
Energy saving achieved 40 kW per as after 50% throttling remove.
Some Pressure drop occur after the full open condition show in the below figure.
Mill and Whizzer frequency shown in below table.
Vibration in mill is Okay during the trail condition.
Circulation flow of the Mill Blower is also same.

Mill Blower Trial Data

SNParameterUnitRegular RunningDuring Trial
1Damper Position%50% Close100% Open
2Fan Suction Pressure Before DampermmWC231.2231.2
3Fan Suction Pressure After DampermmWC788.800286.96
4Fan Discharge PressuremmWC43.5243.52
5Flowm3/hr30200.030500
6PowerkW8646
7Fan FrequencyHz48.637
8Whizzer FrequencyHz2121
9Mill FrequencyHz3939
Mill Suction Damper 50% Throttling Diagram

Mill Suction Damper 50% Throttling

Mill Suction Damper Full Open Diagram

Mill Suction Damper Full Open

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