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Suspended Solids Removal by Hydrocyclone |
The removal of solids from water can be a complicated process because of the multitude of different methods of filtration that are available to choose from. B & V have considerable experience in choosing the correct method of solids removal for a particular application.
One method of suspended solids removal that has particular use in water treatment for the removal of a variety of deposits from cooling systems and closed system heating and chilled water circuits is by using a hydrocyclone.
How it Works
Driven by the the inlet pressure, the water or liquid with particles enters the top chamber at a tangent causing rapid rotation and acceleration through the tangential slots/holes in the top section of the separator, down into the centre section.
The rotation of the liquid forms a vortex in the centre of the separator with the centrifugal force causing separation of the heavy particles from the liquid. The separated particles accumulate in the bottom collection chamber where they are periodically purged.
Advantages
- No moving parts
- No filter elements,screens, bags or media
- No cleaning costs
- No down time - continuous filtration
- Low water loss when purging
- Low pressure loss.
- No backwash
Cooling Towers
Cooling towers by the method that they operate act as an air scrubber and continually collect solid matter from airborne dust and pollution They can also collect precipitated hardness salts and corrosion products. All this material circulates throughout the system, combining with the biofilm and can cause fouling of condensers, heat exchangers and other process equipment reducing operating efficiency and increasing maintenance and cleaning
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The Solution
The STC Cobra range of high performance cyclone separators are designed for sidestream filtration on cooling towers and evaporative condensers to continually remove suspended solids down to less than 20 micron in size from the cooling water and purge the cooling tower sumps of any accumulated debris. The accumulated dirt is automatically purged to drain without backwashing and with no interruption in the filtration using the minimum amount of water. |
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Benefits
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Closed Circuit Heating and Chilled Water Systems
Dirt, debris, swarf, welding splatter and mill-scale are all incorporated into closed circuit water systems during construction. The complexity of pipework design in modern buildings means that it is impossible to remove all this contamination by pre-commission cleaning and flushing.
CSF Cobra sidestream filters remove suspended solids and debris from the system down to less than 20 micron and ensure systems achieve and maintain design performance with the minimum of maintenance throughout their working life, eliminating blockages and ensuring continuation of operation controls.
CSF Sidestream filters incorporated during construction will augment the pre-commission cleaning and flushing to rapidly remove mill-scale, rust and debris incorporated in the system during construction, reducing the risk of blockages and damage to valves and equipment.
By continuously removing and preventing any accumulation of suspended solids, CSF filters enable chemical corrosion inhibitors and biocides to work effectively, maintaining system integrity and ensuring reliable and trouble free operation of controls.
Any debris introduced by modification and alterations to the system subsequent to commissioning will be rapidly removed by the CSF Sidestream Filter, ensuring ongoing plant reliability.
CSF Sidestream Filters can also be used with mild dispersants to effectively clean up old or fouled systems with minimum of disruption
Applications
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Heating Systems
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Chilled Water Systems
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Glycol Systems using zero liquid loss dirt collector
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Brine Systems using zero liquid loss dirt collector
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Thermal Fluid Systems using zero liquid loss dirt collector
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High Pressure Hot Water Systems
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Versatemp Systems
Benefits
- Continuous Filtration with no change in pressure loss - can be used in mainstream flow. No variation in pressure loss or flow rate as dirt is collected.
- No Backwash Required - filtered dirt is purged to drain with minimum water loss whilst service flow is maintained.
- Zero Water Loss Option - when fitted with closed recovery dirt collector the unit will operate with no system water loss, ideally suited to glycol and brine systems. Allows visual inspection of dirt removed.
- Compact Easily Installed - can normally be fitted as sidestream filter using existing connections. High filtration with minimal plantroom are required.
- Easily Integrated into System Design - fixed flow and pressure loss characteristics and continuous flow capability allow units to be easily integrated into systems at the design stage.
- Filtration to less than 20 micron - progressive removal of particulates down to 5 micron on recirculating systems.
- Prevents Valve and Control Problems - installed for at least 3 months following commissioning of new installations, COBRA cyclone systems will remove any remaining silt and debris following pre-commissioned cleaning preventing problems control equipment and valves. Especially applicable to sensitive fan coil systems which are difficult to flush and which incorporate complex and sensitive control valves.
- Reduces Cleaning by continually removing suspended solids and preventing any build up.
- Improves Plant Efficiency by maintaining clean surfaces in heat exchangers
If you would like to make a no obligation appointment with one of our qualified water treatment engineers to discuss your application, please email sales@bvwater.co.uk or telephone +44 (0)1327 871967
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