Air at 1 atm and 80 ºC is used for the fluidization of catalyst pellets in...

Air at 1 atm and 80 ºC is used for the fluidization of catalyst pellets in 2.5 mm diameter in a vertical cylindrical reactor. The density of the catalyst particles is 3000 kg/m³. The catalyst particles have a sphericity (Øs) of 0.8 and . What should be the minimum limit of the air velocity? Explain the reasons

b) If the air flow rate is 45000 kg/h and the operational air velocity is 1.5 Vt, what should be the reactor diameter? Viscosity of air is 2.1x10^-5 kg/m.s

Solutions

Expert Solution

samet mamat answered 1 week ago

Next > < Previous

Related Solutions

1.Humid air at 50 ºC and 1.0 atm with 2 ºC of superheat is fed to...

1.Humid air at 50 ºC and 1.0 atm with 2 ºC of superheat is fed to the condenser. Gas and liquid streams leave the condenser in equilibrium at 20 ºC and 1 atm. (a)Assume a basis of calculation of 100 mol inlet air, draw and label a flow chart for the process. (b)Calculate the mass of water condensed per m3 of air fed and kJ transferred per m3 air fed. (c)What cooling rate (kW) would be required to process 250...

Catalyst pellets of 5 mm diameter are to be fluidized with 45,000 kg/h of air at...

Catalyst pellets of 5 mm diameter are to be fluidized with 45,000 kg/h of air at 1 atm and temp. 30 C in a vertical cylindrical vessel. The density of the catalyst particles is 850 kg/m3; their sphericity is 0.85. The given quantity of air is just sufficient to fluidize the solids. Determine the vessel diameter and terminal velocity. Show pressure drop versus superficial velocity characteristic curve showing both fixed and fluidized bed region. Assume void fraction (under fixed bed...

One mole of carbon monoxide at 10 ºC is completely burnt at 1 atm pressure with...

One mole of carbon monoxide at 10 ºC is completely burnt at 1 atm pressure with 50% excess air. The air is fed to the burner at a temperature of 540 ºC. The combustion products leave the burner chamber at 425 ºC. Use a molar flow and enthalpy summary table to help organize your work. Draw a labeled PFD. Define your system. Analyze the energy balance relationship that applies to your system. Calculate the heat involved in this process, in units of kJ per mole...

Air enters a window air conditioner at 1 atm, 36oC and 75% relative humidity (??) at...

Air enters a window air conditioner at 1 atm, 36oC and 75% relative humidity (??) at a rate of 12m3/min and it leaves as saturated air at 18oC. Part of the moisture in the air which condenses during the process is also removed at 18oC. Determine (a) the rate of heat (Q?) and (b) moisture removal from the air. (c) What-if Scenario: What would the rate of heat removal be if moist air entered the dehumidifier at 95 kPa instead...

A thin plate is suspended in air at 1 atm. with T_infinite= 15°C. Air flows on...

A thin plate is suspended in air at 1 atm. with T_infinite= 15°C. Air flows on both sides of the plate where the bottom side absorbs a uniform radiative heat flux of 1542 W/m2. The plate is oriented parallel to the flow and the length along the flow direction is 60 cm. Consider the plate is negligibly thin and the width of the plate (perpendicular to the flow) is large, so that the problem can be considered as a 2D...

Air at a pressure of 1 atm and a temperature of 50°C is in parallel flow...

Air at a pressure of 1 atm and a temperature of 50°C is in parallel flow over the top surface of a flat plate that is heated to a uniform temperature of 100°C. The plate has a length of 0.24 m (in the flow direction) and a width of 0.12 m. The Reynolds number based on the plate length is 30,000. (a) What is the rate of heat transfer from the plate to the air? (b) If the free stream...

Air at 1 atm flowing at a rate of 0.1 kg / s has to be...

Air at 1 atm flowing at a rate of 0.1 kg / s has to be cooled from 400 to 300K in a tube of 10 cm in diameter with a uniform wall temperature of 250 K. Determine the length of the tube.

Air enters an adiabatic compressor at 100 kPa (absolute) and 20 ºC at a rate of...

Air enters an adiabatic compressor at 100 kPa (absolute) and 20 ºC at a rate of 0.075 m3 /s, and it exits at a pressure of 900 kPa (absolute). The compressor has an isentropic efficiency of 70 percent. Neglecting the changes in kinetic and potential energies, determine (a) the exit temperature of air and (b) the power required to drive the compressor.

The heat of fusion of ice is 80 cal/g at 0 °C and 1 atm, and...

The heat of fusion of ice is 80 cal/g at 0 °C and 1 atm, and the ratio of the specific volume of water to that of ice is 1.000:1.091. The saturated vapor pressure and the heat of vaporization of water at 0 °C are 6.026 × 10-3 atm and 600 cal/g, respectively. Estimate the triple point of water using these data

An insulated steel pipe carries hot water at 80 ºC. The outer surface of the insulation...

An insulated steel pipe carries hot water at 80 ºC. The outer surface of the insulation loses heat to the environment by convection and radiation. For convection, assume hconv = 5.8 W/m2.ºC. The emissivity of the insulation is 0.88 and conductivity, k = 0.038 W/mK. The surroundings are at 30 ºC. Assume the inner surface of the insulation is at the water temperature. What is the surface temperature of the insulation?

Subjects