Advance process Engineering - Assignment Example

(I) Any value in a pump system can be taken as an outlet. Therefore, taking point j to be an outlet, it the head loss of the point can be calculated from the point j as; …(II) Therefore the flow velocities in the pumps will be given as; …. (III) … (IV) … (V) The friction factors in the respective pipes can be calculated using Colebrook equation as below … (VI) … (VII) …. (VIII) Question 3 a) i.) Such high pressure is needed to provide the propelling force of the gas and to reduce the volume of the gas being transported. . This is achieved by putting a given quantity of a solid into appropriate conditions that result in solid/fluid mixture to have properties of a fluid.

The relationship developed to predict the minimum fluidizing velocity is mainly based on experimental work, despite the fact that many of its important applications is in high temperature locations. According to the tests to show the relationship between fluidization over a range of given temperature, there is a marked discrepancy between prediction and the value of the measured velocity when physical properties values are used appropriating the operating conditions. There is a relationship between the pressure drop across the fluidized bed and buoyant weight per unit area in that the pressure drops is approximately equal to buoyant weight per unit area.

There are two approaches in describing these two phenomena in which one considers the process of sedimentation occurring due to dense packing and the other considers the general velocity of the particles. For either consideration, bed voidage is necessary at minimum fluidization. Voidage refers to the function to the particle distribution, particle size and particle shape. The voidage reduces with an increasing size distribution. Also, the operating temperature relates to the voidage in that as the bed voidage increases, there is a significant increase in operating temperature.

During the experiment, the hot fluidized bed is contained in a 188 mm diameter stainless steel cylinder. The fluidization gas is then introduced into the bed through stainless steel distributor plates having a diameter of 0.5 and 1.0 mm drilled holes on a 6 mm 6 mm square pitch