Jiri Smid

Hot gas cleanup: pilot testing of moving bed filters

In recent issues of the magazine, J Smid, SS Hsiau, CY Peng and HT Lee have assessed granular moving bed hot gas particulate clean up systems for advanced IGCC and PFBC power stations; looked at the development of particulate collection devices; as well as highlighting new designs of moving bed filters. In the final part, they examine filter media and moving bed filter pilot plants.

Hot gas granular moving bed filters for advanced power systems

In advanced coal-fire cycles it is important to remove the fine particles from high temperature and high pressure gas streams, to satisfy gas turbine fuel quality requirements. J Smid, S S Hsiau, C Y Peng and H T Lee assess granular moving bed hot gas particulate clean-up systems for advanced IGCC and PFBC, under development in the USA.

Granular moving bed filters and adsorbers (GM-BF/A) — patent review: 1970-2000

Abstract Granular moving bed filters and adsorbers (GM-BF/A) for hot gas cleanup continue to be developed as a key component of current integrated gasification combined cycle and advanced pressurized fluidized bed combustion power generation systems. This paper contains a review of the patent literature on GM-BF/A equipment with sidewalls provided with a number of louvers or screenless granular moving bed systems. Patents granted to GM-BF/A equipment are categorized in groups according to thedesign characteristics. Non-uniform flow of a granular moving bed (filter medium, sorbent) is discussed in detail.

Moving bed filters for hot gas cleanup

In the December issue of Filtration+Separation, J Smid, S.S Hsiau, CY Peng and HT Lee assessed granular moving bed hot gas particulate clean up systems for advanced IGCC and PFBC advanced power stations, under development in the USA. They now turn their attention to the development of the particulate collection devices themselves…

The discharge of fine silica sands in a silo

Numerous industrial processing operations involve the handling and transport of powders, bulk solids, and granules. Silos and bins are widely used to store granular solids, and it is imperative to be able to control the flow rate during the discharge of these solids from such equipment. It is important to study the gravity discharge of fine particles because of its many industrial applications. Most theoretical and empirical equations for the calculation of the discharge rate of fine powders tend to overestimate when particles smaller than about 500u2002μm are used. An air stream flows through a silo from an outlet on the top which may cause the discharge process to become unstable and erratic. We used open-top and closed-top silos with different sizes of outlet openings for an experimental study of the discharge behaviors of different-sized silica sands. The impact force, average discharge rate and pressure drop were measured and are discussed. Darcy’s law was used to predict the pressure drop and this calcu...

The Discharge of Fine Silica Sands in a Silo

Numerous industrial processing operations involve the handling and transport of powders, bulk solids and granules. Silos and bins are widely used to store granular solids. Most theoretical and empirical equations for calculation of discharge rate of fine powders are overestimated when particles smaller than about 500 μm. An air stream flows through silo from outlet to the top which may cause the discharge process becoming unstable and erratic. Open‐top silos and closed‐top silos with different sizes of outlet openings were used for experimentally studying the discharge behaviors using different‐sized silica sands. The impact force, average discharge rate, pressure drop were measured and discussed. Darcy’s law was used to predict the pressure drop and compared with the experimental results. Bubble phenomena may occur in the very fine‐powder silo system.