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HELLER INDIRECT DRY COOLING SYSTEM

HomeHELLER INDIRECT DRY COOLING SYSTEM
Heller indirect dry cooling systems

Heller system

Invented by Proffessor and mechanical engineer László Heller in the early 1950s, Heller System® has gained worldwide recognition as the ultimate dry cooling choice. Heller Indirect Dry Cooling System is applicable for the cold end of all kinds of steam cycles including fossil fired, nuclear, solar and biomass power plants.

Heller Indirect Dry Cooling Systems include a water-cooled condenser, circulating machine groups, circulating water mains and a dry cooling tower accommodating Forgó-type water-to-air heat exchangers. The water-cooled condenser can either be DC Jet or Surface Condenser type.

Condensation of turbine exhaust steam takes place in a water-cooled condenser while heat rejection takes place in a cooling tower. The system is practically insensitive to wind gusts owing to the thermal inertia of the large, one time water fill of the cooling circuit. Location of the cooling tower is unconstrained; it need not be in the vicinity of the steam turbine. Solutions are available for climatic extremes (extreme cold & extreme hot).

Main benefits:

  • Lowest vacuum space among dry power cooling systems makes it very suitable for fast start-up power plants.
  • Provides ultimate resistance to freezing even in partial load winter operation.
  • Flexible site layout and arrangement.

Natural draft Heller tower

Natural draft Heller dry cooling towers are one of the key components of the Heller System® contributing to its low auxiliary power consumption. Natural draft dry cooling towers can either be of hyperbolic reinforced concrete structure or aluminium-clad steel structure. Owing to its inherent features, the natural draft tower equipped Heller System® is practically noiseless.

The huge thermal of the natural draft cooling tower lends itself to exhausting the clean flue gas via the concrete structure Heller dry cooling tower, thus saving investment and O&M costs and resulting in lower ground level concentration of remaining airborne pollutants. The natural draft cooling tower can accommodate short metal stacks (stack-in-tower) of CFB boilers, or the exhaust of wet scrubber or wet flue gas cleaning systems (FGD-in-tower) of conventional boilers.

Main benefits:​

  • Lowest operational cost and highest operational availability
  • Practically noiseless
  • Can reduce ground level pollution with stack-in-tower
  • Low CAPEX due to eliminating of chimney

Mechanical draft cooling tower

Mechanical draft Heller dry cooling towers are either cell-in-line or circular. The low visual profile, low noise, induced draft design enables siting of power plants in densely populated urban areas. Constrained plot areas do not restrict application of dry cooling, designs of different tower height, width and length are available. Winter-proof design makes the system applicable in harsh winter climate (even beyond the Polar Circle) and solutions are also available for extreme hot environment.

Main benefits:​​

  • Suitable for constrained plot areas
  • Suitable for extreme climates
  • Low visual profile

Direct contact jet condenser

The Direct Contact Jet Condenser is key to our competitiveness. Lack of finite surface and lack of physical barrier of tubes of a surface condenser ensure better vacuum achieved by the same size cooling tower or requires smaller cooling tower to achieve the same vacuum.
Space under vacuum is the same as with Surface Condensers, which makes hogging of vacuum quick and holding simple. Excess pressure of the cooling water returning from the cooling tower is utilized in recovery hydro-turbines on common shaft with the circulating water pump and the driving motor, thus saving 30-35% of pumping power.

Compared to Surface Condensers the DC Jet Condenser is inexpensive and is practically maintenance free.
DC Jet Condenser design is modular; solutions are available for every turbine output and exhaust direction

HELLER SYSTEMS®
Invented by MVM EGI in Hungary in the early 1950s, Heller System® has gained worldwide recognition as the ultimate dry cooling choice where minimum life cycle costs are in focus.