Effect of leaks on performance of a fabric filter in pulse jet cleaning assisted filtration system

326-331Study embodies assessment of outlet emission in the baghouse exhaust while hole appears on filter due to pyrophoric particles during hot gas filtration or damages due to cages. As it is difficult to study full-scale baghouse, flat PTFE coated polyester filter fabric has been tested in the present study. Experimental research has been carried out to observe and understand the emission behavior of leaks throughout the filtration time. After stabilization of media, the effect of three independent parameters has been used for the study of hole diameter, position of hole and face velocity. The behavior of emitted particles has been studied based on the data generated during online particle measurement system. The experiment leads to the inferences that with increase in hole size, the rate of outlet emission increases but in different manner. Smaller diameter hole does not make prominent effect to position with the face velocity. At all level of hole size, progressive increase in emission and peak pressure have been observed with the face velocity

Effect of leaks on performance of a fabric filter in pulse jet cleaning assisted filtration system

Study embodies assessment of outlet emission in the baghouse exhaust while hole appears on filter due to pyrophoric particles during hot gas filtration or damages due to cages. As it is difficult to study full-scale baghouse, flat PTFE coated polyester filter fabric has been tested in the present study. Experimental research has been carried out to observe and understand the emission behavior of leaks throughout the filtration time. After stabilization of media, the effect of three independent parameters has been used for the study of hole diameter, position of hole and face velocity. The behavior of emitted particles has been studied based on the data generated during online particle measurement system. The experiment leads to the inferences that with increase in hole size, the rate of outlet emission increases but in different manner. Smaller diameter hole does not make prominent effect to position with the face velocity. At all level of hole size, progressive increase in emission and peak pressure have been observed with the face velocity.

Impact of abrasion on mass loss and appearance of injected slub yarn fabrics

Effect of different slub parameters, viz. slub length, slub thickness and slub frequency, on abrasive damage of knitted fabric has been studied. Abrasive damage has been assessed by two ways, namely using loss in fabric mass and deterioration of fabric appearance due to abrasion. The effect of slub parameters, viz. slub length, its thickness and frequency in the injected slub yarn on mass loss of fabric due to abrasion is found to be different than consequent damage in surface appearance. It is observed that the visual effect of abrasion damage of fabric surface appearance is entirely opposite to that of conventional method of measuring abrasion damage in terms of fabric mass loss. In case of slub yarn fabrics, it is possible to have higher damage in surface appearance but lower mass loss of fabric and vice versa due to abrasion

Impact of activated carbon contents on cabin air filter performance at different fume flow rates

The present study has been undertaken to analyze the filtration performance of two different nonwoven polypropylene filter media, viz. needle felt and spun-bonded sandwiched with granular activated carbon of varying concentration under different face velocities. The materials are studied on a laboratory based cabin air filter test rig. Spun bonded material reveals relatively lower emission and pressure drop. Interestingly, lower face velocity reveals relatively improved filter behavior in case of both the filter materials. Further, a reduction in downstream emission in terms of PM2.5 & PM10, number concentration and peal pressure drop is observed at higher concentration of activated carbon.

Impact of progressive pulse cleaning pressure on polyester filter media performance using pulse jet filtration test rig

The effect of progressive pulse cleaning pressure (2 bar to 3.5 bar) on filtration behaviour of two different polyester needle-punched nonwoven filter materials, viz. PTFE finished and without finished media has been studied at varying dust densities using flyash aerosol. The filter materials have been investigated on a flatbed filtration test rig based on cleaning at a fixed peak pressure drop of 1000 Pascal for an equal number of test cycles during the first three phases (conditioning, ageing and stabilizing phase) and further for the final measuring phase of four hours. The particulate emission and residual pressure drop behaviour are found to be significantly less in the case of PTFE-coated material under all the operating conditions. However, a significant difference among all levels of progressive pulse pressure has been found for both the examined materials

Effect of varying cycle time interval and aerosol pre-charge on filtration performance of polyester media

Present study embodies filtration characterization of two nonwoven needle-felt polyester filter materials, viz. PTFE coated and without coated media. The materials have been assessed using flyash aerosol under varying time intervals (6, 9 and 12 min) at different inlet dust densities (50, 90 and 150 g/m3). The flyash particles are charged prior to their deposition over the filter media using a three phase parallel plate box pre-charger at two different levels of pre-charge, viz. 4 kV and 8 kV along with 0 kV. Results reveal that the filtration performance for PTFE coated material is better under all conditions. However, an enhanced filtration performance in terms of particle emission and pressure drop is noted at increased pre-charge level and higher cyclic interval. It may also be noted that the level of improvement in filtration behavior for both the materials has been better at initial level of pre-charge from 0 kV to 4 kV. However, the cumulative behavior of all the factors is also found significant.

Energy consumption analysis of electrostatically assisted flat and tubular based filtration test rigs using polyester conductive media

n current study, the energy utilized by two types of laboratory based electrostatically assisted pulse jet filtration set-ups, viz. flat media test rig and tubular based test rig has been analyzed and compared. Three types of polyester nonwoven conductive filter media viz. polytetraflouroethylene coated media, stainless steel fibre blended with polyethylene terephthalate media and stainless steel scrim media have been characterized on both setups at three levels of aerosol charge, viz. 4 kV, 8 kV, 12 kV and without charge. The results reveal a significant drop in energy utilization ranging from 20% to 35% at pre-charge levels for both setups. Among all three materials, polytetraflouroethylene coated material is known to perform the best in both test setups. The contribution of compression energy in total power consumption is found to decrease in tubular based setup. However, the total energy consumption has been found to be the lower for flat media test rig.

Energy consumption analysis of electrostatically assisted flat and tubular based filtration test rigs using polyester conductive media

269-274In current study, the energy utilized by two types of laboratory based electrostatically assisted pulse jet filtration set-ups, viz. flat media test rig and tubular based test rig has been analyzed and compared. Three types of polyester nonwoven conductive filter media viz. polytetraflouroethylene coated media, stainless steel fibre blended with polyethylene terephthalate media and stainless steel scrim media have been characterized on both setups at three levels of aerosol charge, viz. 4 kV, 8 kV, 12 kV and without charge. The results reveal a significant drop in energy utilization ranging from 20% to 35% at pre-charge levels for both setups. Among all three materials, polytetraflouroethylene coated material is known to perform the best in both test setups. The contribution of compression energy in total power consumption is found to decrease in tubular based setup. However, the total energy consumption has been found to be the lower for flat media test rig

Impact of activated carbon contents on cabin air filter performance at different fume flow rates

350-355The present study has been undertaken to analyze the filtration performance of two different nonwoven polypropylene filter media, viz. needle felt and spun-bonded sandwiched with granular activated carbon of varying concentration under different face velocities. The materials are studied on a laboratory based cabin air filter test rig. Spun bonded material reveals relatively lower emission and pressure drop. Interestingly, lower face velocity reveals relatively improved filter behavior in case of both the filter materials. Further, a reduction in downstream emission in terms of PM2.5 & PM10, number concentration and peal pressure drop is observed at higher concentration of activated carbon

Reliability analysis of stretchable workwear fabric under abrasive damage: influence of stretch yarn composition

Movement comfort is an important performance parameter for workwear fabric. The lower value of load developed in the fabric at a certain extension level indicates lower stress on the skin and easier body movement. After repeated usage, there is a possibility of degradation in this movement comfort due to abrasion and cyclic loading. Measurement of the probability of successful performance of the workwear fabric in terms of movement comfort during usage is possible through reliability analysis. The present study is concerned with the reliability analysis of the body movement comfort of the workwear fabric under abrasive damage. The effect of composition and structure of different types of stretch yarn, i.e. cotton core spun, polyester core spun and polyester multifilament air-covered yarn, on this reliability has been studied. It is seen that after repeated cyclic loading there is a degradation in the movement comfort of the fabrics. The extent of degradation depends on the composition of the stretch yarn. Although the workwear fabric with the elastane contained cotton core spun weft yarn showed lower abrasion resistance, it showed the best reliability values in terms of movement comfort. Abrasive damage resulted in improvement in the level of movement comfort at higher levels of loading cycles