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Gernot Krammer – One of the best experts on this subject based on the ideXlab platform.

  • influence of operating parameters on cake formation in pilot scale pulse jet Bag Filter
    Powder Technology, 2012
    Co-Authors: Mahmood Saleem, Gernot Krammer, Rafi Ullah Khan, Suleman M Tahir

    Abstract:

    Bag Filters are commonly used for fine particles removal in off-gas purification. There dust laden gas pervades through permeable Filter media starting at a lower pressure drop limit leaving dust (called Filter cake) on the Filter media. The Filter cakeformation is influenced by many factors including filtration velocity, dust concentration, pressure drop limits, and Filter media resistance. Effect of the stated parameters is investigated experimentally in a pilot scale pulse-jet Bag Filter test facility where lime stone dust is separated from air at ambient conditions. Results reveal that filtration velocity significantly affects Filter pressure drop as well as cake properties; cake density and specific cake resistance. Cake density is slightly affected by dust concentration. Specific resistance of Filter cake increases with velocity, slightly affected by dust concentration, changes inversely with the upper pressure drop limit and decreases over a prolonged use (aging). Specific resistance of Filter media is independent of upper pressure drop limit and increases linearly over a prolonged use.

  • effect of filtration velocity and dust concentration on cake formation and Filter operation in a pilot scale jet pulsed Bag Filter
    Journal of Hazardous Materials, 2007
    Co-Authors: Mahmood Saleem, Gernot Krammer

    Abstract:

    Bag Filters are used for the removal of fine solid particles from process gases. Thus, understanding the Filter cake build up and its properties is a subject of interest. The Filter cakes properties may depend on many factors like, for example, filtration velocity and dust concentration. The effect of dust concentration and filtration velocity on filtration time, specific cake resistance and mean cake density is investigated in a pilot scale jet pulsed Bag Filter. An in situ optical system is used to measure cake thickness distributions on the Filter surface. Additionally, the operation is simulated using a one-dimensional model and results are compared with experiments. The experimental results indicate that cake density and specific resistance increase with increasing velocity at constant dust concentration. The effect of dust concentration on Filter cake density and specific resistance is small.

  • optical in situ measurement of Filter cake height during Bag Filter plant operation
    Powder Technology, 2007
    Co-Authors: Mahmood Saleem, Gernot Krammer

    Abstract:

    Abstract A pilot scale jet pulsed Bag Filter test facility is operated at conditions similar to those of the industrial Bag Filters. The facility is equipped with a stereo vision based optical system for in-situ cake height distribution measurements on the Bag Filter surface. Experimental data are presented and data evaluation procedures are discussed to elaborate the features of the measuring system. The results show that the cake height distribution becomes narrower towards the end of filtration cycles. A steep pressure drop rise is observed at the start of a filtration cycle in the absence of re-attachment and a non-uniform Bag cleaning, which may be attributed to different cake properties. The specific cake resistance remains constant over the linear part of the pressure drop curve indicating a non-compressible cake formation. The analysis of residual cake patches shows a large number of small sized cake patches and a few large sized cake patches on the Filter surface. The cake patch size increases with the cake formation. The fractal analysis of patches boundary indicates preferential cake formation at the boundary of the residual cake patches shortly after regeneration.

Hyun Seol Park – One of the best experts on this subject based on the ideXlab platform.

  • Non-uniform filtration velocity of process gas passing through a long Bag Filter
    Journal of Hazardous Materials, 2018
    Co-Authors: Sangcheol Park, Joonmok Shim, Hyun Seol Park, Yun Haeng Joe, Weon Gyu Shin

    Abstract:

    Filtration velocity is one of the dominant parameters that determine the pressure drop through a Bag Filter. Experimental investigation of the air flow pattern around a Bag Filter inside a Bag house is very difficult because of the complexity of the 3-D air flow. For this reason, we numerically investigated flow characteristics along a Bag Filter in detail. We newly found that the filtration velocity is non-uniform along the axial direction of a long Bag Filter when the height of the Filter is greater than 10 m. The filtration velocity is very small at the bottom of the Bag Filter but very large at the top. For Bag Filter lengths of over 10 m, 70% of total inlet flow is Filtered in just the top 30% of the long Bag Filter. This indicates that the top section of the long Bag Filter could deteriorate faster than the bottom section, making it necessary to develop a new method to avoid the problem. We developed an equation that can help predict the initial pressure drop across long Bag Filters with different heights, but identical filtration characteristics.

  • Influence of air injection nozzles on Filter cleaning performance of pulse-jet Bag Filter
    Powder Technology, 2017
    Co-Authors: Joonmok Shim, Yun Haeng Joe, Hyun Seol Park

    Abstract:

    The Filter cleaning performance of different air injection nozzles installed in a pulse-jet Bag Filter dust collector were compared. The examined nozzles were a hole nozzle, a nipple nozzle, and a dual-slit injector. The latter is an air injection nozzle with two circumferential slits, which was newly designed in this study to introduce large volumes of cleaning air with a small amount of compressed air, thereby significantly improving the Filter cleaning efficiency. When the dual-slit injector was applied under a 2.0 m/min filtration velocity, superior Filter cleaning performance and lower dust emission were observed compared to those for the hole and nipple nozzles. In addition, there was little difference in Filter cleaning efficiency according to pulsing air pressure, indicating that low and high pulse pressures can yield similar levels of Filter cleaning performance when the dual-slit injector is employed; thus, the pulsing energy for Filter regeneration can be reduced. Under a 4.0 m/min filtration velocity, neither the hole nor nipple nozzle yielded effective Filter cleaning, generating a higher pressure drop and a significantly reduced pulse-jet cleaning interval. On the other hand, the dual-slit injector applied to the pulse-jet Bag Filter maintained stable Filter cleaning performance, even under the high filtration velocity.

  • Evaluation of the can velocity effect on a Bag Filter
    Powder Technology, 2017
    Co-Authors: Yun Haeng Joe, Joonmok Shim, Hyun Seol Park

    Abstract:

    In this study, the effects of can velocity on the performance of a pilot-scale Bag Filter dust collector were examined. Test Bag Filters were made of polyester fabric and had a 156 mm diameter and a 3 m length. The cleaning interval of the pulse-jet cleaning system and the effects of inlet particle concentration with various can velocities were considered. When the dust collector was operated with insufficient can velocity, an unreasonable increase in the cleaning interval was observed. The cleaning interval decreased with the increased can velocity. Furthermore, under the unsuitable can velocity condition, the increasing tendencies of the cleaning interval and dust emission by decreased inlet particle concentration deviated from the expected theoretical tendency. Therefore, the appropriate can velocity should be selected in a pilot-scale experiment for improving the prediction of actual-scale dust collector performance.

Mahmood Saleem – One of the best experts on this subject based on the ideXlab platform.

  • influence of operating parameters on cake formation in pilot scale pulse jet Bag Filter
    Powder Technology, 2012
    Co-Authors: Mahmood Saleem, Gernot Krammer, Rafi Ullah Khan, Suleman M Tahir

    Abstract:

    Bag Filters are commonly used for fine particles removal in off-gas purification. There dust laden gas pervades through permeable Filter media starting at a lower pressure drop limit leaving dust (called Filter cake) on the Filter media. The Filter cakeformation is influenced by many factors including filtration velocity, dust concentration, pressure drop limits, and Filter media resistance. Effect of the stated parameters is investigated experimentally in a pilot scale pulse-jet Bag Filter test facility where lime stone dust is separated from air at ambient conditions. Results reveal that filtration velocity significantly affects Filter pressure drop as well as cake properties; cake density and specific cake resistance. Cake density is slightly affected by dust concentration. Specific resistance of Filter cake increases with velocity, slightly affected by dust concentration, changes inversely with the upper pressure drop limit and decreases over a prolonged use (aging). Specific resistance of Filter media is independent of upper pressure drop limit and increases linearly over a prolonged use.

  • effect of filtration velocity and dust concentration on cake formation and Filter operation in a pilot scale jet pulsed Bag Filter
    Journal of Hazardous Materials, 2007
    Co-Authors: Mahmood Saleem, Gernot Krammer

    Abstract:

    Bag Filters are used for the removal of fine solid particles from process gases. Thus, understanding the Filter cake build up and its properties is a subject of interest. The Filter cakes properties may depend on many factors like, for example, filtration velocity and dust concentration. The effect of dust concentration and filtration velocity on filtration time, specific cake resistance and mean cake density is investigated in a pilot scale jet pulsed Bag Filter. An in situ optical system is used to measure cake thickness distributions on the Filter surface. Additionally, the operation is simulated using a one-dimensional model and results are compared with experiments. The experimental results indicate that cake density and specific resistance increase with increasing velocity at constant dust concentration. The effect of dust concentration on Filter cake density and specific resistance is small.

  • optical in situ measurement of Filter cake height during Bag Filter plant operation
    Powder Technology, 2007
    Co-Authors: Mahmood Saleem, Gernot Krammer

    Abstract:

    Abstract A pilot scale jet pulsed Bag Filter test facility is operated at conditions similar to those of the industrial Bag Filters. The facility is equipped with a stereo vision based optical system for in-situ cake height distribution measurements on the Bag Filter surface. Experimental data are presented and data evaluation procedures are discussed to elaborate the features of the measuring system. The results show that the cake height distribution becomes narrower towards the end of filtration cycles. A steep pressure drop rise is observed at the start of a filtration cycle in the absence of re-attachment and a non-uniform Bag cleaning, which may be attributed to different cake properties. The specific cake resistance remains constant over the linear part of the pressure drop curve indicating a non-compressible cake formation. The analysis of residual cake patches shows a large number of small sized cake patches and a few large sized cake patches on the Filter surface. The cake patch size increases with the cake formation. The fractal analysis of patches boundary indicates preferential cake formation at the boundary of the residual cake patches shortly after regeneration.