JNW CleaningSolutions

JNW is the world’s leading provider of cleaning systems and services for the outside cleaning of all kinds of air-cooled heat exchangers. Air-cooled heat exchangers are used in a variety of industrial settings including power plants, waste incineration plants, the chemical industry, refineries, the petrochemical industry, the gas industry, the automobile industry, the timber treatment industry, the food and beverage industry and the ceramic, glass and paper industries. We can provide cleaning systems and services for the outside cleaning of heat exchangers, infrasonic soot and dust cleaning systems, Conco Systems for the inside cleaning of heat exchanger tubes and full maintenance of fan drives

With JNW cleaning systems all known air-cooled heat exchangers can be cleaned:

• Air cooled condensers (ACCs)
• Flat coolers – both induced and forced draft
• V-designs
• Vertical designs
• Hybrid cooling towers
• Natural draught cooling towers

The consequences of fin tube fouling

Air-cooled heat exchangers are constantly at risk from external fouling of the fin tubes by pollen, dust, insects, leaves, plastic bags, bird carcasses, etc. This reduces the airflow and the heat transfer coefficient, causing deterioration in performance and resulting in lower process efficiency and higher operating costs. A small amount of external fouling will have a significantly negative effect on performance. Typically, on a vacuum steam system, a 20% reduction in airflow will increase the turbine backpressure by 33% so even at low ambient temperatures it is not possible to maintain the turbine backpressure.

For types of heat exchangers (e.g. process coolers) other than air-cooled condensers the process temperature will increase or output will reduce. Reductions of 20% are not unusual; in extreme situations it can be as much as 50%. Using a high-pressure hand lance or fire hose only leads to a small improvement and a superficial cleanliness, since only a small part of the fouling can be washed off. The rest is pressed between the fin tubes and will not be rinsed out. Once the fouling itself is compressed it not only obstructs the heat transfer, but also the airflow of the fans. Cleaning by JNW removes deposits from external fouling of finned tubes in a way that is impossible when using a hand lance or fire hose.