Abstract
Sidewall pressure of the filter is one of the dominant parameters that determine its dust cleaning performance. However, the flow field characteristics of pulse-jet dust cleaning have a great influence on the sidewall pressure distribution. This study aimed to determine the prediction and calculation methods of the sidewall pressure of the filter under different experimental conditions. Based on the theory of fluid impinging jet, a numerical simulation was used to investigate the sidewall pressure distribution law in this study. It was found that the pressure stable phase plays a major role in cleaning dust, and the pulse-jet dust cleaning process can be divided into five sections in the stable phase. The relationship between central axis velocity, inlet pressure, injection distance, and filter structural size at five sections was summarized. Subsequently, the sidewall pressure distribution was obtained by the distribution law of velocity field. Finally, these results were verified by experiments, and the resulting error was less than 23%. The study findings can be used to evaluate the effect of dust cleaning in engineering, assist in selecting dust cleaning parameters, and provide theoretical reference for designing pulse-jet dust cleaning system.
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Data availability
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- \(\Delta p\) :
-
Pressure drop \((P_{a} )\)
- \(\alpha\) :
-
Surface permeability of filter material (\((m^{2} )\))
- \(\mu\) :
-
Laminar viscosity coefficient \((P_{a} \cdot s)\)
- \(D_{P}\) :
-
Average pore diameter of filter material \((m)\)
- \(\varepsilon\) :
-
Porosity of filter material (%)
- \(\Delta m\) :
-
Thickness of filter \((m)\)
- \(C_{2}\) :
-
Pressure jump coefficient \((m^{ - 1} )\)
- \(T\) :
-
Inlet temperature \((K)\)
- \(T_{0}\) :
-
Steady temperature after complete attenuation \((K)\)
- \(c_{p}\) :
-
Specific heat capacity at constant pressure, \(\left( {{{kJ} \mathord{\left/ {\vphantom {{kJ} {\left( {kg \cdot k} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {kg \cdot k} \right)}}} \right)\)
- \(k\) :
-
Specific heat ratio, \(k = 1.4\) for diatomic gas
- \(P\) :
-
Inlet pressure \((P_{a} )\)
- \(P_{b}\) :
-
Absolute atmospheric pressure \((P_{a} )\), \(P_{b} = 0.1MP_{a}\)
- \(P_{{{\text{ain}}}}\) :
-
Absolute inlet pressure \((P_{a} )\), \(P_{{{\text{ain}}}} = P + P_{b}\)
- \(P_{w}\) :
-
Sidewall pressure \((P_{a} )\)
- \(V_{0}\) :
-
Steady velocity after complete attenuation \((m/s)\)
- \(V_{p}\) :
-
Average velocity \((m/s)\)
- \(V_{m}\) :
-
Axial velocity \((m/s)\)
- \(\Psi^{2}\) :
-
Degree of fitting
- \(\Delta_{{ma{\text{x}}}}\) :
-
Maximum error
- \(dQ\) :
-
Permeation air quantity \((kg/m^{2} \cdot s)\)
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (grant number 11572269, 51606159) and the Project of Education Department in Sichuan (grant number 17ZA0405, 17ZB0439).
Funding
This work was supported by the National Natural Science Foundation of China (Grant Number 11572269, 51606159) and the Project of Education Department in Sichuan (Grant Number 17ZA0405, 17ZB0439).
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All authors contributed to the study conception and design. QZ, AJH, and HLX. prepared data, experimented, and analyzed. The first draft of this manuscript was written by QZ, AJH. modeled the model, and DL and HYC guide the whole process. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Zhang, Q., Liu, D., Hu, A.J. et al. Flow field and pressure characteristics in pulse-jet dust cleaning. Int. J. Environ. Sci. Technol. 20, 6735–6746 (2023). https://doi.org/10.1007/s13762-022-04347-w
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DOI: https://doi.org/10.1007/s13762-022-04347-w