Design Requirements for Smoke Exhaust System of Generator Set

Today, we will briefly introduce the design requirements and considerations of the smoke exhaust system of the generator unit.

Noise level: the noise generated by the generator unit shall be effectively attenuated to meet the requirements of local regulations and installation site. This can be achieved by selecting the silencer correctly: industrial type: 12 to 18 dBA, residential type: 18 to 25 dBA, critical type: 25 to 35 dBA.

Smoke exhaust system setting: reduce the back pressure of the smoke exhaust system as much as possible. Too high back pressure will negatively affect combustion efficiency, increase exhaust temperature, resulting in engine power loss and shorten its working life. Therefore, the length of smoke pipe should be shortened as far as possible, the number of elbows should be reduced, the resistance of muffler should be reduced and the diameter of smoke pipe should be increased.

Location of smoke exhaust outlet: the most convenient outlet is not the best location. The designer should comprehensively consider wind direction, building design, layout, distance, smoke exhaust flow rate and other factors. Smoke exhaust shall be prevented from entering any important fresh air inlet (window, door, air inlet, combustion fresh air inlet of generator unit, cooling and ventilation inlet of generator set, etc.) to prevent fresh air from being polluted by smoke exhaust; It is also necessary to reduce the impact of chimney noise on workers and neighbors and the accumulation of dust contained in smoke exhaust on adjacent buildings.

Pipeline design: all smoke exhaust pipelines shall be well supported and fixed. The unsupported muffler cannot be installed at the exhaust manifold of the generator set or the outlet of the generator set supercharger.

A soft connection shall be installed between the smoke pipe and the generator unit to absorb the thermal expansion and contraction of the pipe, the displacement and vibration of the unit, and reduce the heavy pressure of the smoke pipe on the unit and between the smoke pipes; The flexible connection shall be as close as possible to the unit exhaust outlet (supercharger or exhaust manifold).

The smoke exhaust terminal shall be installed with rain-proof cap, cover and other rain-proof design to prevent rain and snow from entering. The smoke pipe close to the unit shall be installed with condensate collector and drain valve.

It is recommended that the generator set does not share smoke exhaust pipes with furnaces, boilers or other equipment. The accumulation of carbon dust and condensate emitted by the equipment in operation will cause damage to non-operating units, and the lack of lubrication of the passively driven supercharger will cause bearing failure.

Length: shorten the length of the smoke exhaust system as much as possible, thus reducing the resistance (back pressure) of the system, which is more conducive to smoke emission; Reduce the chance of gas condensation and reduce the degree of flue gas.

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