Research on the filtration performance of plush filter media for air conditioning return air filtration

A large amount of dust will be generated during the production of shredded tobacco and the rolling of cigarettes in the cigarette workshop, which not only affects the production process of cigarettes, but is also detrimental to the health of workers [1-5]. The air-conditioning system of the cigarette workshop not only ensures the workshop temperature and humidity required by the production process, but also ensures the air cleanliness stipulated by the process and labor hygiene standards. Especially in the coiling and bagging workshop, the process dust production is large and the air dust concentration is high. Although a variety of new filter material filter cartridge dust removal technologies have been adopted [6], the air conditioning return air purification effect is not ideal. It will still affect the air conditioning The heat exchange effect of the surface cooler [7] makes the air conditioner unable to operate normally [8]. At present, the commonly used filter materials in the filter section of the air conditioning system include stainless steel plate mesh, stainless steel wire mesh, multi-layer nylon mesh or non-woven fabric, etc.[9] Fiber filter media [10] and plush filter media. In recent years, there have been reports on the research of gradient ultra-submicron fiber filter materials in the field of dust removal in cigarette workshops [11-12], but there is still a lack of research on the dust filtering performance of plush filter materials. Therefore, the filtration performance parameters (mainly including efficiency, resistance, and dust holding capacity) of the plush filter material under different wind speeds and different dust concentrations were tested and analyzed, and the filtration performance of different types of plush filter materials was analyzed by a comparative method. The best filter performance section of the plush filter material is designed to provide theoretical help for selecting the best filter material for air conditioning return air filtration in cigarette workshops. 1 Materials and methods 1.1 Materials, equipment and instruments 1.1.1 Experimental dust The dust from the air-conditioning return air of the cigarette workshop (poor sliding property and strong adhesion) was selected as the experimental dust. 1.1.2 Plush filter material sample The experimental object is plush knitted filter material, which is a fleece fabric based on knitted single-sided cushion weft knitting structure. It consists of two kinds of yarns: ground yarn and cushion yarn (velvet yarn). It is made of brushed fabric and a uniform fluff layer is formed on the surface. The samples in this experiment are long-pile knitted filter media JM2, JM5 and low-pile knitted filter media DM (Figure 1). Among them, the flocking density of JM5 is larger than that of JM2, and the flocking length of JM5 and JM2 is longer than that of DM. The parameters of the plush filter material used in the experiment are shown in Table 1. 1.1.3 Experimental bench The experimental bench is shown in Figure 2, which consists of the experimental dust supply part, the air duct, the fixing device of the experimental filter, the pressure loss measuring device, the dust measuring device and the wind speed measuring device. devices, etc. Among them, the dust generator sets the inlet dust concentration range (0.6-3 mg/m3) according to the workshop air dust limit [13] of the tobacco dust hygiene standard (2 mg/m3). The air duct is made of plexiglass to observe the flow state of dust in the air duct. Baffles are installed at the inlet of the pipe, the inlet pipe section of the interface between the pipe and the fan, and the exhaust pipe section to make the air flow in the pipe uniform, so that the experimental air flow and dust concentration can be uniform, so as to ensure that the dust concentration can be measured in a stable state. The test ports for measuring the pressure loss are set on the upper and lower airflow sides respectively, and the distance from the fixed part of the experimental filter is half the diameter of the air duct, in the form of a static pressure ring pressure measuring device. 1.1.4 Instrument FA1104 digital electronic balance (sensitivity: 0.1 mg, Shanghai Hengping Scientific Instrument Co., Ltd.); U-tube pressure gauge (Changzhou Jiangtai Electronics Co., Ltd.); GH100E dust concentration measuring instrument (Zhengzhou Guangli Technology Co., Ltd.) company); CLIMOMASTER MODEL A531 multi-function instrument (Kanomax, USA). 1.2 Methods Through comparative experiments, the filtration efficiency and filtration resistance values ​​of each plush filter material sample at wind speeds of 0.2, 0.4, 0.6, 0.8 and 1.0 m/s, and at dust concentrations of 0.6, 1.0, 2.0 and 3.0 mg/s were obtained. Filtration efficiency and filtration resistance value under m3, etc. The specific measurement and calculation methods are as follows: (1) Filtration efficiency. Determine the inlet dust concentration by controlling the dust generation time and dust amount, and use the dust concentration measuring instrument to collect the dust concentration after the filter material, then the filtration efficiency is:η=(C1-C2)/C1 In the formula: C1—Dust concentration at dust inlet, mg/m3; C2—Dust concentration at the outlet, mg/m3. If the dust is stably and continuously emitted into the pipeline, the inlet dust concentration C1 is: C1= G/tQt (2) where: G— Dust emission, mg; Qt— Gas flow, m2/s; t— Dust generation time, s. In the same way, the outlet dust concentration C2 can be converted from the dust capture amount G2 in the filtered gas: C2= G2/tQt (3) (2) Gas flow rate and filtering wind speed. The air velocity in the pipeline is measured by the CLIMOMASTER multi-function instrument, the gas flow is calculated, and the dynamic pressure method (pipe tube) is used for calibration

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