Cooling Towers
Graver Technologies offers water treatment filtration technology for cooling tower systems.
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Water Filtration Technology for Cooling Systems
As an integral component of many cooling systems, cooling towers are typically used in industrial applications and in large commercial buildings to extract heat from a process or building system through evaporative cooling. Cooling tower systems operate most efficiently when their heat transfer surfaces are clean, but by design, require a large airwater interface to obtain this cooling. The system is therefore subject to four major water treatment concerns: corrosion, scaling, fouling and microbiological activity. These waterborne deposits (suspended solids) reduce heat transfer efficiency, which substantially increases the energy cost for operation of chillers. As concerns increase with water usage due to drought and the desire to reduce wastewater discharge, many cooling towers are now being operated at higher contaminant concentrations (high cycle) than previous. These higher concentrations of suspended solids created by reduced blowdown, only compound the problems within the system by increasing the deposition rate. However, the suspended solids can be effectively removed from cooling water by means of filtration, allowing for the high cycle operation.
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- Efficient removal of contamination from pipe rust and biofilm that abrasive wear, fouling heat exchangers, coating pipe work, and affecting the operation of valves and mechanical pump seals
- Large geometry available to provide high efficiency and high flow in reduced footprint
- Wide range of rating available to allow a step down ratings process to get trouble systems under control
Product Selection
- CMBF™ or MBC™ Melt blown depth filters for general particle control
- Stratum® Melt blown depth filters when more critical particle control is required below 10 micron
- High Flow™ large geometry filters to meet the large volume flow demands in a small footprint
Frequenty Asked Questions
How often should gas turbine filters be replaced?
This depends on the environment and filter type; however, pre-filters are changed every 3–6 months, while final filters may bechanged once in a year or two. Monitoring pressure drop is key to determiningreplacement timing.
What factors affect the operating life of a gas turbine filter?
Here are some factors:
- Ambient dustand pollution levels
- Operatinghours and load
- Pulse-cleaningfrequency, depending on the type
- Humidity andmoisture
- Filter mediaand design
How do I know when a filter needs to be changed?
Differential pressure across the filter is animportant aspect in this case. If it increases beyond the set threshold, thefilter may be clogged or need cleaning or replacement.
What is pressure drop and why does it matter?
Pressure drop is the resistance to airflow through afilter. A high-pressure drop reduces turbine efficiency and increases energycosts. Selecting low-resistance filters helps improve performance.
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