Heat exchange is the transfer of heat energy from one medium to another. For each application, A.H. Lundberg works with the client to get the most economically efficient configuration and process-effective solution.

In many cases, this requires working with contaminated low pressure steam and liquids that may contain fiber, corrosives, and severely fouling solids. A.H. Lundberg has extensive experience in specific industrial processes such as:

  1. • TMP mills - Efficient and reliable refiner steam heat recovery steam generators that provide the clean steam necessary for the associated paper machine.
  3. •  Kraft batch mills - Blow heat recovery systems that provide very hot water to the mill.
  5. •  Kraft continuous digester mills - Flash steam condensers which provide warm to very hot water. Alternately, the flash steam may be used directly in pre-evaporators.
  7. •  Nickel processing - Recovery of heat from autoclave flashed sulphuric acid laden steam in a minimally sized direct contact arrangement.

In all cases, knowledge of, and capability to deal, with the contaminants are integral to successfully recovering the energy in the contaminated steam as well as keeping the equipmentt costs down especially when the metallurgies required are exotic.

In other cases, our expertise includes working with fluids that require special attention:

  1. •  Kraft mills - Recovery of heat from the hot extraction stage discharge to cold chlorine dioxide requires special arrangements to allow for the explosive nature of de-entrained vapour as well as the metallurgy demanded by the chlorine dioxide.
  3. •  Kraft mills - Heavy liquor is best heated just prior to burning in the recovery boiler to improve combustion.  An indirect heater is best utilized in this service as this avoids extra water from condensed steam being injected into the fuel.  Our specialized Indirect Heavy Liquor Heater is offered with REX technology to reduce pumping power requirements, to enhance heat transfer rate, and to prevent scaling.

In all cases, knowledge of the specific processes and of heat exchange are necessary to ensure reliable and cost effective energy savings.