HEAT EXCHANGERS and COOLING SYSTEMS

WASTE HEAT UTILIZATION

Waste heat utilization systems used with local heat and district heat allow the energy that is recovered to be put to the best possible use in a profitable way. 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. Economizers and condensers enable heat to be used in two stages. In the first stage, the economizer recovers sensible heat on the water side at about 212^o F (100^oC). In the second stage, the flue gas condenser decouples latent heat on the water side at a temperature about 140^o F (60^o 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 process

Benefits of the ERCS technology:

Recover 50% of boiler output in heat
Save 30% in fuel costs
Reduce investment costs by 20% for heating the facility
Minimize particulate emissions

Scheuch heat recovery and condensation technology

HEAT EXCHANGERS and COOLING SYSTEMS

ECONOMIZER

An economizer is used to recover heat up to 212^o F (100^o 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^o F and 212^o F (90^o C and 100^o c) in applications such as district heat, process heat, or standard drying applications.

Benefits:

High efficiency (temperature different < 37^o F (3^o 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
With the appropriate design, the flue gas close to return temperature is cooled. 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 flue gas is directed around the tubes and the heating water into the tubes – an additional plate heat exchanger is not necessary.

Minimize operating costs
The system also features low pressure losses on both the flue gas and heating water side. 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.