Croll Reynolds has supplied units for a broad spectrum of applications for over 75 years. The following are some examples of areas where Croll Reynolds thermocompressors provide significant energy savings.


Paper Production requires a tremendous amount of steam. Spindle operated units provide important energy savings because of their ability to compensate for variations in the temperature of the dryer and changes in discharge pressure.

Petro-Chemical Processing Equipment such as dryers, stills, strippers and deodorizers usually discharge water vapor at relatively low pressures. A thermcompressor compresses this vapor to a reusable higher pressure.

Desalination Multi effect evaporators used in seawater desalination utilize Croll Reynolds Thermocompressors after the final effect to capture and recycle energy which might otherwise be wasted.

Food Concentrates such as fruit and vegetable juices, tomato paste, etc., are processed in evaporators and dryers. Significant savings can result from recompressing the vapors removed from the food products and then returning them to the process at a higher temperature.

Pharmaceutical Products are frequently heat sensitive, requiring evaporation or drying at relatively low temperatures. Thermocompressors yield maximum efficiency when operated at the low temperature ranges required for such applications.

Dairy and similar evaporators normally operate under a partial vacuum to minimize potential heat damage to the food flavor. Thermocompressors cut costs here.

Evaporators lend themselves to the use of thermal recompression as an effective method of achieving significant reduction in live steam consumption. A portion of the overhead vapors, which contain significant latent heat can be recycled to the steam chest. The thermocompressor essentially replaces the pressure regulator or the reducing valve that controls steam pressure and temperature for evaporation. Under most conditions Thermocompressors can easily be applied to single and multiple-effect units.

A thermal recompression evaporator can operate over a much wider range of pressures than a typical mechanical recompression unit. More importantly, a Croll Reynolds Thermocompressor requires relatively low capital investment to achieve meaningful energy savings in the overall operation. Properly applied, a savings equivalent to the addition of another effect at a substantially lower equipment and installation cost can be realized.

Users typically specify thermal recompression in the initial design of their units. In existing installations, evaporators may be retrofitted to increase thermal efficiency and, in some cases, to increase the quality of the end product.


Croll Reynolds Thermocompressors can also be used for mixing gases (steam, air, natural gas, etc.) at different temperatures or different pressures to achieve an intermediate condition. The proportion of the two gases can be accurately and consistently controlled. The proportions of the mixture are limited only by the motive-to-load ratio.

Paper Dryers

The regulation of steam temperature on the rolls of Yankee Dryers, used in the Paper Industry, is an ideal application for a Spindle Operated Thermocompressor . The pneumatically controlled unit maintains the pressure drop across the dryer to allow for the Delta P through the rolls, flash tank and piping. Efficient temperature control is achieved in several other industries with thermocompressors as well.

Waste Heat Recovery Systems

It is in the area of energy conservation that the Thermcompressor exhibits its most cost-effective advantage. In this type of application waste high temperature condensate is collected in a centralized flash chamber then flashed at atmospheric temperature and recirculated. Condensate from heating jackets or kettles can be flashed, recompressed by the Thermocompressor, and then recirculated to the jacket, with significant savings in energy costs.