Browsing by Subject "fluidized bed"

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Access status: Open Access ,
Experimental capacitance planar array sensor design for flow monitoring in fluidized bed
(Wydawnictwa AGH, 2010) Matusiak, Bartosz; Romanowski, Andrzej; Silva, Marco Jose da; Thiele, Sebastian; Hampel, Uwe
Many different methods can be used to monitor the process in the industry. However, the visualization of phase distributions in a wide range of processes is still a challenge. In this paper we would like to present the planar array design of capacitance sensor, which might be used for this purpose in fluidized beds. The developed sensor is 706 mm long, 86 mm wide and consists of 16 x 64 electrodes, what gives 1024 measurement points. It was placed inside an experimental fluidized bed column and applied to monitor flow regimes. During the experiments the sensor was connected to a recently developed capacitance measuring apparatus, which was already evaluated with a wire-mesh sensor. Since the proposed design is expected to reveal changes only by the surface, due to its planar structure, we performed a numerical analysis of sensor sensitivity, as well.
Access status: Open Access ,
Suszenie Parą w Złożu Fluidalnym pod Ciśnieniem (SPZFC) i oddzielanie dwutlenku węgla przez płuczkę gazową - nowe wyzwanie dla wytwarzania energii elektrycznej z węgla brunatnego
(Wydawnictwa AGH, 2011) Lechner, Stefan; Rombrecht, Hans-Bernd; Krautz, Hans Joachim
The protection of the climate requires the separation and discharge of carbon dioxide proceeding from lignite fired power plants. One measure to achieve this objective is the scrubbing of the flue gas. This process demands a high energy input in form of heating steam of a pressure of ca. 4 bar. A further measure to decrease the carbon dioxide emissions and increase the profitability of the power plant is the predrying of the lignite. A recent process is the Pressurized Steam Fluidized Bed Drying (PSFBD). Due to the high pressure the equipment is smaller than in atmospheric dryers and the steam coming from lignite water has a temperature range between 140 and 160 degrees of Celsius. The integration of this heat in the power plant process is a task still to solve. The combination of drying and gas scrubbing allows the use of the entire heat coming from the dryer in the gas scrubber where nearly 40% of the heat demand in the desorber can be substituted. By this means the necessary heat which has to be got after the intermediate steam turbine is significantly reduced. The overall power plant efficiency rises. The paper gives an overview about the state of the PSFBD-research and discusses possibilities of the use of the this heat in the desorber of a flue gas scrubber.