HEAT EXCHANGERS and COOLING SYSTEMS
WASTE HEAT UTILIZATION
Waste heat utilization systems utilize both local and district heat to maximize the use of recovered energy in a profitable manner. Scheuch developed the Energy Recovery & Cleaning System (ERCS) that maximizes waste heat utilization for boiler outputs of up to 200 MW utilizing condensers and economizers. Condensers and economizers facilitate the use of heat in two stages. In the first stage, the economizer recovers sensible heat on the water side at about 212°F (100°C). In the second stage, the flue gas condenser decouples latent heat on the water side at a temperature about 140°F (60°C).
ERCS waste heat utilization technology can be implemented across several applications such as:
- Increasing efficiency in district and local heat resources
- Process heat (steam or ORC processes)
- Dry shavings, fuel, or timber
- Reducing the steam plume at the chimney outlet
- Reuse heat for industrial processes.
Benefits of the ERCS technology:
- Recover 50% of boiler output in heat
- Save 30% in fuelcosts.s
- Reduce investment costs by 20% for heating thefacility.y
- Minimize particulate emissions

HEAT EXCHANGERS and COOLING SYSTEMS
ECONOMIZER
An economizer is used to recover heat up to 212°F (100°C). ERCS technology can detect if condenser operation is not efficient and switch automatically to the economizer. This allows the waste heat utilization to continue under conditions where conventional waste heat utilization systems would no longer be able to work economically. The economizer can reuse the energy between 194°F and 212°F (90°C and 100°F) in applications such as district heat, process heat, or standard drying applications.
Benefits:
- High efficiency (temperature difference < 37°F (3°C)
- Low flue gas pressure loss minimizes operating costs.
- Direct heat transfer from the flue gas to the heating system
- Compact design
- Can be retrofitted



HEAT EXCHANGERS and COOLING SYSTEMS
CONDENSER
Both sensible and latent heat content can be recovered with a flue gas condenser. The energy output from the condenser improves as the return temperature decreases or as the moisture in the flue gas increases.
High efficiency
The appropriate design cools the flue gas close to the return temperature. This allows a temperature difference of less than 37° F (3° C).
Direct heat transfer
The heat exchanger consists of high-quality, stainless-steel plain tubes. The tubes direct the flue gas around them and the heating water into them, eliminating the need for an additional plate heat exchanger.
Minimize operating costs
The system also features low pressure losses on both the flue gas and heating water sides. In addition, permanent flushing is not necessary for heat extraction, meaning that the rinsing pump is only active periodically. This means a 50% saving of electrical operating costs compared with conventional
scrubber systems.


