High performance exhaustgas heatexchanger
Our exhaustgas heatexchangers are designed to remove heat from the exhaust of a natural-gas or Diesel engine; unfortunately they are not recommendable for boiler flue gas.

They can be used in combined heat and power plants (CHPs) and also on engines operating in hazardous environments were it is necessary to reduce the temperature of the exhaust gases. Tubes, tubeplates and  shell are made of AISI316L (DIN 1.4404) stainless steel, endcovers cast iron; we can at extra costs supply stainless steel endcovers too. The maximum working temperature tube side 700°C, shellside 150°C, 5 bar
(safety valve included).

When using exhaustgas heatexchangers on Diesel-engines considerable soot deposits must be expected on the heatingsurface. These deposits will lead to a reduced performance and an increase of the exhaustgas temperature shortly.
                
All exhaustgas heatexchangers sized by us (for both, natural-gas and Diesel engines) will be provided with a heatingsurface reserve. As a consequence, not until an average soot-thickness of aprox. 0,3 - 0,6 mm,  the desired exhaust outlet-temperature will be exceeded; depending on the quality of the soot. When the heatexchanger is clean, the rated-value, in relation to the watertemperature, will fall short off.

Our products can be mechanically or chemically cleaned; bear in mind to reserve enough room when cleaning by means of brushes. Soot resulting at both methods must be disposed. In order to minimize the soot and not to get below the condensation temperature, it is of utmost importance to keep an eye on the critical exhaust outlet-temperature, depending on the fuel used (natural-gas or Diesel).

                                                   Consult APTE for detailed information!

In case of the exhaust- and the enginewater energy is being transferred together via the secondary cooler  (see scheme) the exhaustgas heatexchanger should receive the enginewater  f i r s t . The tubetemperature inside the exhaustgas heatexchanger will benefit from the warmer water. Next the enginewater is being cooled by the process fluid, i.e. water from return flow of the central heating boiler.
 
When using separate emission of exhaust- and the enginewater energy the secondary cooler can be smaller. Available from 962 to 2042mm (length over all) with a bodydiameter from 89 to 324mm.

Installation
The exhaustgas heatexchangers should be installed horizontally with the water connections on top so that they are always full of water. It is important that any thermostatic values are arranged so, that there is always a flow of water through the heatexchanger; even on starting when the engine is cold. Automatic  engine shutdown equipment should be provided with temperature probes in the exhaust gas heatexchanger and the engine. The heatexchanger should be installed below the level of the cylinderhead, so that in the unlikely event of a tube leak  occurring, water will not leak back into the engine.

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so that we can size the right heatexchanger applicable to your requirement!