soot collector

Study of load losses

SUMMARY

In this project an aerodynamic study of a soot collector has been carried out. The objective was to evaluate the overpressure generated in the combustion chamber as a consequence of the loss of load that it generates in the final section of the gas outlet chimney. Due to the natural draft of the combustion gases, it is necessary to check that this increase in pressure does not imply an operation problem.

From real gas outlet operating conditions, the collector pressure drop factor has been modeled. In this way it is possible to evaluate the overpressure that is generated inside the combustion chamber, at different operating points of the burner.

 

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Modelo 3D

To study the influence of the soot collector, the final section of the gas outlet chimney has been modeled. This collector is an element used to collect solid elements from combustion. The heavier solid elements collide with the collector and fall due to the effect of gravity at the bottom. This reduces pollution from industrial combustion.

RESULTS

The results obtained are those corresponding to a real operating point of the burner. The conclusions obtained and the modeling of the collector load loss factor allow us to extrapolate these results to different operating points.

ONLY FIREPLACE

In the first place, the behavior of the chimney has been modeled without any external element. These results are used to compare the simulation results with real gas output values. It is always convenient to start from a real operating point that serves as a reference to validate the conclusions from CFD studies.

Contours for pressure, velocity and temperature are shown below.

ONLY FIREPLACE

In the first place, the behavior of the chimney has been modeled without any external element. These results are used to compare the simulation results with real gas output values. It is always convenient to start from a real operating point that serves as a reference to validate the conclusions from CFD studies.

Contours for pressure, velocity and temperature are shown below.

WITH SOOT COLLECTOR

Next, the effect of the soot collector has been simulated. The objective was to obtain the overpressure value generated as a consequence of the head loss induced by this element. Thanks to obtaining the pressure drop factor, it is possible to obtain this overpressure value for different operating points of the combustion chamber.

Thanks to CFD simulation it is possible to check the aerodynamic effects that an element such as the soot collector can cause in the gas outlet. Specifically, to validate that it is possible to add the collector without affecting the gas outlet flow rate by natural convection.

CURRENT LINES

Finally, the current lines around the soot collector are shown. Thanks to the ability to visualize the fluid field, it is possible to understand at a glance the effect that elements such as the collector have on the behavior of the air. In this case, the chimney alone and the collector with the lower outlet open have been simulated.

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