Page 71 - Industrial Plant 2015

Table 1 - Results of case study 1 Original system setup Upgraded system
4400 m3/h, filter 4400 m3/h, filter
Air flow bag filter F7 Cam-Flo XMGT, F9
Pre-filter stage E10 CamGT 3V-600; E12
Final filter stage 250 Pa 200 Pa
Intial pressure drop over system 85% 99.5%
Final stage efficiency MPPS (*) 20%
Reduction in air resistance

(*) Most Penetrating Particle Size according to EN1822_2009

particles, moist salt and small water dropletsmedia the gas turbine clean to assure good economy and

area: 6-8 m2 reliably. Secondly, a clean gas turbine operates

- face velocity: 2.3 - 2.9 m/s efficiently and with less environmental impact and

- media velocity: 0.29 - 0.48 m/s finally, the cost of clean air is not the cost of replacement

• Stage 4: compact filter F9-E10 (optional E11-E12, filters – it is how much energy the filters use during their

H13) high efficiency filter. The fine filter stage working life at the desired efficiency.

collect small, dry salt particles, sticky hydrocarbons

and sub-micron dust particles Case study 1
- media area: 18 - 26 m2

- media velocity: 0.09 - 0.16 m/s

• Stage 5: (optional) to protect the turbine from Filtration system upgrade solves salt

harmful fouling the final stage is a EPA or HEPA ingestion problem for land based
class filter with filtration efficiencies from 85% power generation turbine
MPPS (Most Penetrating Particle Size)

- media area: 29 - 30 m2

- media velocity: 0.076 - 0.1 m/s A 33 MW land based gas turbine installed near a salt Fig. 4 - CamGT 3V-
600 gas turbine filter
mine, where potash and magnesium crude salts are (courtesy Camfil
Power Systems)
The above system is proven after 10 years of operation extracted, suffered from peaks in air resistance and

on hundreds of installation world-wide. Even if frequent exchanges of final filters after some time in

dimensions are larger compared to the high velocity operation. The air inlet system was equipped with

type it offers a number advantages in terms of reliability a standard filter setup consisting of a F7 bag

and efficiency: filter and an E10 final filter.

An on-site air analysis

reliability assurance → less stops revealed that levels of

• clean engine due to minimized An on-site air analysis sodium chloride – salt –
penetration of sub micron revealed that levels were higher than
particulate of sodium chloride expected, due to the
– salt – were higher production and transport
• long operational cycles gives than expected, due of potash in the surrounding
maintenance during planned to the production and area. Salt, in combination
shutdowns transport of potash in with seasonal humidity,
the surrounding area creates a challenging
• flexibility, the individual filter
elements can be replaced if site

conditions shows to be different environment for gas

than expected turbines. Dry salt was

being captured in the pre-

efficiency assurance → more production: filter media, and when humidity rose, liquid

• higher power due to less engine degradation salt slowly penetrated the pre-filter and

• higher power due to lower pressure drop was carried over to the final filter, causing

• less shutdowns due to higher dust holding a rapid increase in pressure drop.

capacity and less fouling To deal with this amount of contaminant,

the system was upgraded with deep

We can conclude that it’s extremely important to keep filters CamGT 3V-600 (figure 4), a

Industrial Plants - May 2015

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