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Analytical model for evaluating lateral capture efficiencies in surface treatment tanks
F Marzal1, E González, A Miñana
1Universidad Politécnica de Cartagena, Departamento de Ingeniería Térmica y de Fluidos, Paseo de Alfonso XIII, 48, 30203 Cartagena, Murcia, Spain. FJ.Marzal@upct.es
Summary
This study evaluated the capture efficiency of a surface treatment tank with a lateral capture system. Results show efficiency depends on airflow and temperature-induced drafts, crucial for industrial ventilation design.
Area of Science:
- Industrial Ventilation
- Environmental Engineering
- Chemical Process Safety
Background:
- Surface treatment tanks can release hazardous vapors.
- Effective capture systems are essential for worker safety and environmental protection.
Purpose of the Study:
- To assess the capture efficiency (ET) of a pilot-scale surface treatment tank.
- To investigate the influence of specific capture flow rate (qc), tank dimensions, and temperature on capture efficiency.
Main Methods:
- A pilot-scale installation (1.8m x 1.6m) was used to simulate a surface treatment tank.
- Sulfur hexafluoride (SF6) was employed as a tracer gas for emission studies.
- Capture efficiency was measured across various tank lengths (1.2m, 1.53m, 1.8m) and temperatures (ambient to 95°C) under low surrounding air velocity conditions (v ≤ 0.1 m/sec).
Main Results:
- Capture efficiency (ET) was found to be dependent on the specific capture flow rate (qc).
- A model relating ET to two exponential functions was developed.
- Efficiency was influenced by the ratio of capture velocity to surrounding air velocity and capture velocity to temperature-induced draft velocity.
Conclusions:
- The pilot-scale system demonstrated a quantifiable capture efficiency.
- The developed model provides a predictive tool for optimizing ventilation in surface treatment operations.
- Understanding the interplay between airflow dynamics and thermal effects is key to designing efficient industrial capture systems.