| Biological purification equipment for odor pollutants has become the main force of odor pollution control equipment in the field of environmental protection due to its good purification effect,environmental protection without secondary pollution,and simple installation and maintenance.At present,most of the biological purification equipment has problems such as low utilization rate of purification modules,unreasonable utilization of biological adsorbents,and insufficient utilization of adsorption efficiency.Therefore,based on the purification principle of biological purification equipment,this paper proposes to install a porous plate as a current-sharing element in the biological purification equipment,and numerically analyze the resistance characteristics of the porous plate;based on the above analysis,select a suitable flow-sharing hole Plate structure,using Fluent fluid simulation software to conduct numerical simulation research on the flow field of different combinations of orifice plates and different purification module distribution positions,and selected a structure suitable for the purification device;designed an inlet air flow Deploy the device,and verify the accuracy and feasibility of the optimized design by comparing and analyzing the performance of the original equipment and the equipment equipped with the entrance uniform distribution device.The main contents and conclusions of this study are as follows:1)Combined with the biological purification and mass transfer theory,the purification characteristics of biological purification were investigated from three aspects:inlet wind speed,biological agent spray flow,and biological agent concentration.The results show that the spray flow and preparation concentration of the biological purification module all have a certain degree of purification effect.The effect has an impact.According to the actual situation,considering that the changes in the workplace of the purification equipment require different ventilation volumes,it is extremely important to keep the purification equipment at the optimal purification effect under different ventilation volumes.Therefore,the convection channel and the biological purification module were selected.Study of uniform distribution of internal airflow.2)The flow path of the biological purification device uses a porous plate as an air distribution element,and the fluent software is used to study the resistance characteristics of the average flow perforated plate with an opening ratio of 0.07 to 0.48,an opening number of 286 to 3185,and a relative thickness of 0.17 to 0.75 The analysis summarizes the relationship between the resistance characteristics and the related parameters of the flow equalizing perforated plate.It is concluded that the perforated plate thickness is 2 mm,the opening hole diameter is 8 mm,and the opening ratio is in the case of an inlet wind speed of 2 to 8 m·s-1.In the range of/?>0.2,the change of the resistance coefficient of the perforated plate is small,which is an ideal parameter for uniformly distributing the perforated plate by air flow.3)A numerical simulation model of the uniform air distribution device at the inlet was established,and the flow field distribution and the uniformity of the airflow on the windward side were studied under different opening ratios,different layers of perforated plates,and different purification module locations.Based on the balance between the resistance brought by the perforated plate and the uniformity of the airflow,the research shows that when the double perforated plate is arranged,and the opening ratios of the perforated plate 1 and perforated plate 2 are 0.4 and 0.3,respectively,the airflow on the windward side is uniform The cloth has the best performance,and the speed root mean square RSM value reaches 0.17 on average.4)Based on the above theoretical analysis and numerical simulation test analysis,according to the simulation optimization results,the relevant perforated plate and flow channel structure and inlet uniform distribution device were designed,and the purification equipment and original equipment equipped with the inlet uniform distribution device were optimized For comparative analysis,the RTD curve is used to characterize the residence time of the gas in the cavity,and a single-phase flow field numerical simulation experiment is performed on the entire biological purification equipment at different intake air speeds.The results show that at different inlet air velocities,the purification equipment equipped with the inlet uniform distribution device has a 47.5%increase in the gas residence time inside the cavity compared to the original equipment,and the average air velocity on the windward side of the biological purification module has decreased by an average of 40.8%In summary,the inlet airflow uniformity device designed in this paper satisfies the airflow uniformity requirements of the windward side of the biological purification module on the airflow uniformity.Under the condition that the airflow uniformity is satisfied,the pressure drop generated by the perforated plate is low.And in the overall equipment of the biological purification device,the residence time of the airflow in the cavity can be effectively improved,and the air velocity on the windward side can be delayed.The device can provide a certain theoretical reference and technical support for the structural optimization of biological purification equipment. |
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