Pneumafil Nederman. INDA Presentation October 17, Use of non-woven media for gas turbine air inlet filtration 1.

Transcription

1 Pneumafil Nederman INDA Presentation October 17, 2015 Mcleod Stephens Use of non-woven media for gas turbine air inlet filtration 1

2 Who is Nederman? A 70 year old company founded in Sweden by Philip Nederman. Focus on air filtration solutions for industrial processes. Acquired the filtration assets of Environmental Filtration Technologies 9/2012 *MikroPul *Menardi *Pneumafil 2

3 Development of Non-woven filter media for air inlets of gas turbines Understanding Filtration Needs of Gas Turbines Why media requirements differ from other types of industrial air filtration processes Media used for types of filter house designs Challenges and needs for gas turbine filter house users. 3

4 Air Inlet Filtration for gas Turbines System installations with between 80 and 1800 filters installed Up to ½ million Ft² per filter house 4

5 Turbine inlets Industries On Shore Petroleum Refining Metals/Minerals Food & Beverage Chemical Processing Pulp & Paper Pharmaceutical 5

6 Turbine inlets Off Shore 6

7 Turbine inlets Middle East 7

8 Turbine Population North America * Plants Turbines Hours Base Load Intermediate / 5000 Peaking / 2500 Total 1,754 4,221 * INDUSTRIAL INFORMATION RESOURCES 8

9 Gas Turbine Installation U.S. 9

10 Filtering dusts in varied environments Arctic Urban Rural Desert Coastal 10

11 Why Gas Turbine Inlet filtration is challenging Reference by The Donaldson Company on Turbine Filter Specifications 11

12 Why GT Air Inlet Filtration so Special? CamFil Presentation at Filtration Conference

13 The performance points EN1822 HEPA PERFORMANCE E10 = MPPS E11 = MPPS E12 = MMPS 13

14 Types of Air Inlet Filtration Self Cleaning Pulse systems Canister style filters similar in design to industrial dust collector cartridges Can automatically reverse clean to manage the air flow restriction caused by dust loading. Typically media technology that promotes surface loaded Manufactured for high durability due to operating conditions and equipment design 14

15 Self-Cleaning Filter Arrangement 15

16 The Pulse Jet Cleaning System Use PSI of compressed air to back pulse filters 16

17 Self-Cleaning Pulse Jet Cartridge Final filter Cartridge (s) Wet Laid or spun bond F7 F9, MERV Ft² (single) 500 Ft² (filter set) Air flow from 700 CFM 1760 CFM Media rate 3.0/3.5:1 Designed for surface filtration. 17

18 Multi-stage static systems Requires several stages of pre and final filtration Stages to trap various sizes of particles and water droplets Reduce dust loading down stream Media designed for depth loading Designed to protect the final high efficiency static filter. 18

19 Static System layout 19

20 Multi-Stage Static/Barrier Final Filter V-Cell Micro-fiberglass or Synthetic fibers F7 F9, MERV Ft² 220 Ft² CFM/Filter up to 2500 CFM Media Rate 16.5/11.3:1 Pre-Filter G4 F7, MERV 8 13 Depth loading media 20

21 Pre-Filter Pre-Filter Synthetic fibers G4, MERV 8 11 Ft² 70 Ft² CFM/Filter up to 2500 CFM Media Rate 227/35.7:1 Pre-Filter G4 F7, MERV 8 13 Depth loading media Consumable 21

22 Wet Laid Paper - Cartridges Work horse: dust collection and air filter cartridges Basis weight: 115 g/m² up to 150 g/m² Moisture level key decision factor for fiber selection MERV Efficiency out of the box 100 % Cellulose 100% Synthetic 22

23 Spun Bond - Cartridges High burst strength Better resistance in high humidity/moisture. Relatively flat non texturized surface Low Dust Holding Capacity 170 g/m² 260 g/m² 23

24 Barrier Filters Micro glass Meltblown Low burst strength Good dust holding Poor choice for high moisture High burst strength Acceptable dust holding Fibers can be charged to enhance efficiency 24

25 25

26 Efficiency Enhancement Fine Fiber Composites Separate fiber composites laminated to or laid between multiple surface layers. Improved DHC Efficiency Hi-bred designs teeter between true self-cleaning pulse and static filters. 26

27 Efficiency Enhancement Nano Fiber Technology Nano on Wet Laid Paper Nano on Spun Bonded Media 27

28 Efficiency Enhancements Expanded PTFE Membrane Use primarily as a composite design As stand alone barrier filter typically used in pulse systems only. Low dust holding Subject to fouling when subjected to soot or oily particulates 28

29 Typical Physical Testing Data Media Technology Wet-Laid Paper W/Nano Wet-Laid Paper Composite Spunbond W/Nano Polyester, Glass + Polyester, Glass + Material Type resin resin Weight (g/m2) % polyester Mullen Burst (psi) > 200 MD Tensile Strength (lbs/1 ) CMD Tensile Strength (lbs/1 ) MD Tear Strength (lbs) CMD Tear Strength (lbs) EFFICIENCY MERV 13/F8 MERV 15/F9 MERV 15/F9 29

30 Durability / Performance Differences Static design Minimum 8 w.c. burst pressure High velocity requires pleat stabilization Pulse design Minimum 25 w.c. burst pressure Surface loading/cleaning needs wider more open pleats 30

31 Long term durability of enhancements Nano Surface after 4,500 hours of operation 31

32 Composites add performance benefits.. And potential issues Micro-glass inner Layer Composite Layer Delamination 32

33 Processing becomes more complex Lighter basis weights, composites and efficiency enhancements requires more processing complexity.

34 Separate Pre-Filtration / Coalescing Weather Hood droplet eliminators with coalescing pads 34

35 Pre-filtration and coalescing for Static filters 35

36 Pre-filtration and coalescing for cartridge filters Courtesy of AFC Courtesy of Graver Technologies 36

37 Filter Types 37

38 Selecting the proper Filter Anticipated Run Time Base Load vs Peaking Atmospheric conditions Seasonal vs Recurring Dust loading Continuous or Intermittent Moisture Fog, Rain, Snow, Ice 38

39 Creativity by media manufacturers Core business preferences influence R&D Media Mfgs in the business of selling roll goods Developing solution options integrating their core competencies. Media Mfg have differing R&D challenges in design Similar objectives. Better utilize existing/future investments. 39

40 The future in Gas Turbine Filters Media Manufacturers High degree of moisture and humidity resistance. Industry Users Least controllable factor in operating Gas Turbine Improved combination of clean-a-ble media and dust holding. Better standardization of industry testing standards Greater operational flexibility during adverse conditions Improve decision making based upon comparable and reliable data. 40

41 Challenges/Needs Gas Turbine Inlet Filtration technology may always present a level of compromise. Efficiency High level of turbine protection Airflow and Dust Holding Capacity Wider band of operating flexibility for turbine operators Strength/Durability Improved life expectancy for local atmospheric conditions 41