Inlet House Air Filters Presented By: Zahi Youwakim

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Clarence Russell
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1 Inlet House Air Filters Presented By: Zahi Youwakim How do we select the correct filter for our site. What do we need to do to keep the compressor clean. Frequency of filter replacement Cost $ s Monitor compressor eff. Base load units vs peak load. Filter house design and velocity Publications GE GER 3419 A Gas turbine Inlet Air Treatment GE oil and Gas Turbine high efficiency filtration systems. Gas turbine Performance Deterioration. Others

2 Filter velocity 1994 original filiter house 1999 filter house upgrade 84 deg IGV 86 Deg IGV Square Canisters design 600cu ft/min/sq ft 321.6cu ft/min Hydro V design 86 Deg IGV 500per sq ft 731cu ft/min/sq ft

3 Effect of New Filter Element Installation Air Filters Compressor Turbine Generator Filters 1. Higher efficiency 2. Low Pressure drop 3. Less contamination Compressor 1. Cleaner compressor 2. Higher CPD (Compressor Pressure Discharge) Turbine 1. Increased MW production

4 Analyze Phase The ambient temperature and MegaWatt production information was collected on CoGen 1 during a 6 month period in 2014 from April to October Prior to filter element change. Lower ambient temperature will result in higher MegaWatt production. A scatter plot was constructed The results show the effects of ambient temperature (X) on MegaWatt production (Y) prior to element change during a specified period. An equation developed and R 2 calculated for the existing data to compensate for the ambient temperature variance (results can be seen on the following slide).

5 X (Temperature) Effect on the Y Prior to Filter Element Change

6 X (Temperature) Effect on the Mw After Filter Element Change

7 Unit 1 old filters Oct 2013 to March Water wash and installed new filters Unit 1 has new filters after the 2016 April outage Unit 2 New filters Oct 2015 after outage major clean compressor blades y = x R² = y = x R² = amb temp deg f old filters New filters data avg increase in MW 2.4

9 Efficiency 100% 95% 90% 85% 80% 75% 70% 65% 60% E12 Membrane E10 MERV 15 / F9 MERV 13 / F7 55% 50% Particle Size (microns) Overall collection efficiency at most penetrating particle size (MPPS) EN 1822 Standard Filter Class Filtration Efficiency Penetration (H)EPA E10 85 % 15 % E11 95 % 5 % E % 0.5 %

10 What is next for Huntsman Pre filter Testing complete Final Filter complete Re-evaluate the Coalescers and Pre-filter so that we get to 3 years for final filter replacement. Recommended to go with a Coalescers filters of Merv 9 and replace every 3 months (current is a merv 6 and replace every 2 months) Recommended to go with a Merv 15 for the pre filters and replace every 18 months (current is a Merv 8 and replace every 12 months) Keep the After filter E12 and replace every 3 years.

11 Efficiency AmerShield Performance Huntsman Current rating MERV 8 100% 80% 60% 40% 20% 0% AmerShield Efficiency 12 months Particle Size (microns) Laboratory Data MERV 10 Efficiency 0.20 WG 2000 CFM

12 Efficiency HVHXL120 Performance Huntsman Current rating E12 100% 90% 80% HVHXL120 Efficiency 12 months Laboratory Data E11 Efficiency 1.54 WG 1875 CFM 70% 60% 50% Particle Size (microns)

13 Environmental Factors Site Conditions / Operations Life Optimum Filter System Filter Grade Selection Pre-filter Selection Filter Systems Site analysis Pre-filtration systems that work with existing site conditions Sustainability of efficiency Long life for a ROI Factor in both environmental and man made conditions Geological Man made - tower drift, hydrocarbons, etc., etc. What grade is required and why? Product Sustainability

14 Filtration stages work in harmony Pre-filtration is important to lifetime and performance of final filter Filters designed to overcome some of the site specific and seasonal problems not addressed by inlet house (moisture, insects, etc.) Final filter is the polishing filter for submicron particulate capture (H)EPA filtration provides the best protection for engine Keep the moisture out of the engine. Optimum performance and lifetime when properly protected Overall low air flow resistance with optimum engine protection Sustained performance throughout installation life

Filter Framing Any by-pass around high-efficiency filters can decrease performance A 1mm gap causes a MERV 15 to perform as a MERV 14 A 10mm gap causes a MERV 15 filter to perform like a MERV 8

15 Filter Framing Any by-pass around high-efficiency filters can decrease performance A 1mm gap causes a MERV 15 to perform as a MERV 14 A 10mm gap causes a MERV 15 filter to perform like a MERV 8 filter. Framing needs to be correct for the filter product being used Latching of final filter at proper points to frame for proper seal Final filter inspection from Back side. 1 Ward, M., & Siegel, J. (2005). Modeling filter bypass: Impact on Filter efficiency. ASHRAE Transactions, 111, 1,091-1,100.

16 US Standard ASHRAE 52.2 EN779 EN1822 Targeted Particle Size Range (mm) MERV Representative Targeted Particles 1 < 20% 2 < 20% 3 < 20% 4 < 20% % G % % % 9 < 50% > 85% % > 85% % > 85% G1 - G2 > 10.0 G4 M5 M5 - M % > 90% M6-F7 13 < 75% > 90% > 90% F % > 90% > 90% F % > 90% > 90% F Leaves, insects, rain, mist, geological dust, pollen, agricultural dust Fog, talc, coal dust, cement dust, process dusts Coal dust, talc, oil smoke, process dusts Oil smoke, diesel exhaust 16 > 95% > 95% > 95% F9 Hydrocarbon exhaust, N/A E10 > MPPS* carbon black, metallurgical dusts N/A E11 > MPPS* and fumes N/A E12 > MPPS* - MPPS = Most Penetrating Particle Size (varies depending upon media, and media velocity) is typically between 0.07 and 0.2 mm

higher air flow volumes than others Localized higher resistances across

17 Inlet House Design Effects on Filtration Efficiency Flow profile across the filter bank can affect performance Some areas of inlet house experience higher air flow volumes than others Localized higher resistances across filter bank Dependent upon intake filter house design space and economic requirements

18 Filter Resistance Compared to Relative Humidity Static Filter

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