English version Frako-Term logo


Liquid ring pumps

Liquid ring pumps are ideally suited for use in a number of vacuum applications in power generation, all of which benefit from the performance characteristics of liquid ring vacuum pumps. Condenser air extraction and waterbox priming both contribute to increased efficiency of the power plant, whilst flue gas desulphurisation and fly ash handling are associated with treatment of the boiler exhaust gas. Edwards have developed a range of standard pump packages to meet the vacuum pumping requirements for each of these applications.

HR liquid ring pumps

Pompa próżniowa z pierścieniem wodnym HR

As a leader in vacuum technology, Edwards has developed a portfolio of products to meet the demanding applications in process industries. HR Series includes EHR and SHR models, these are two stage construction for peak performance at low suction pressures below 150 mbara. Pump capacities up to 40,000 m3h-1 are available in one stage and 7,500 m3h-1 in two stage models.

Features and Benefits
  • Simplex design with dedicated seal water circuit
  • Fully automatic operation
  • Inlet water spray for inlet volume reduction
  • Inter-stage anti cavitation device
  • Recirculation pump to facilitate optimum seal water flow rate
  • Level control with multiple set points
  • Pump discharge temperature switch to detect operational problems
  • Discharge air flow measuring flow meter
  • Shell & tube heat exchanger with stainless steel tubes
  • Option for plate type heat exchanger as alternative to shell & tube type
Applications
  • Petrochemical: vacuum distillation, vapour recovery
  • Chemical: distillation, Evaporation, filtration, polymerisation, deoderisation, polymerisation
  • Pharmaceutical & Fine Chemical: filter drying, degassing, crystallisation, conveying
  • Power Generation: condenser air extraction, deaeration, Waterbox priming, ash handling, filtration
  • Offshore: seawater deaeration, MEG recovery, drilling mud recovery
  • Food Processing: crystallisation, evaporation, filtration, freeze drying

LR liquid ring pumps

Pompa próżniowa z pierścieniem wodnym LR

Comprising of LR1A and LR1B models, these are one stage pumps designed for operation cross the vacuum range, LR1A right down to 30 mbara whilst the LR1B pumps are optimised for applications at higher pressures above 300 mbara.

Liquid ring vacuum pump performance is dependent upon the seal liquid properties; the seal liquid must be AT a temperature which is low enough to enable the pump to operate at the desired suction pressure. To minimise the amount of seal water required it is often desirable to recycle the seal water back into the liquid ring pump, to enable this either some of the water must be replaced with fresh cooled water (partial re-circulation) or it should all be cooled by a heat exchanger (total re-circulation).

The Edwards liquid ring pump range includes both one and two stage machines enabling optimum efficiency for processes operating across the vacuum range. Pump capacities up to 40,000 m3h-1 are available in one stage and 7,500 m3h-1 in two stage models.

Features and Benefits
  • Two stage liquid ring pump – for optimum performance supporting the steam surface condenser outlet pressure
  • Automatic inlet isolating valve controlled by dual pressure transmitters – for effective transition from hogging to holding
  • Inlet water spray nozzle – to reduce the condensable load to the vacuum pump
  • Interstage air bleed – to reduce cavitation when operating at pressure close to the seal water vapour pressure
  • Shell and tube heat exchanger with large diameter stainless steel tubes – maintaining efficiency by minimising fouling and corrosion
  • Plate type heat exchanger option with titanium plates – for use with seawater cooled applications
  • Seal water recirculation pump – to optimise seal water flow rate
  • Skid mounted junction
Applications
  • Petrochemical: vacuum distillation, vapour recovery
  • Chemical: distillation, Evaporation, filtration, polymerisation, deoderisation, polymerisation
  • Pharmaceutical & Fine Chemical: filter drying, degassing, crystallisation, conveying
  • Power generation: condenser air extraction, deaeration, Waterbox priming, ash handling, filtration
  • Offshore: seawater deaeration, MEG recovery, drilling mud recovery
  • Food processing: crystallisation, evaporation, filtration, freeze drying