A positive pressure dilute-phase pneumatic transport system is used to transport catalyst particles with a mean particle size x =200 m and particle density (pp) = 2250 kg m-3 across a horizontal distance of 200 metres using ambient air density pf = 1.2 kg m-3. The required flow rate (Mp) of the granules is 600 kg h-1. An initial choice of a pipe with an internal diameter, D = 50 mm was made in the initial stages of the design. The maximum allowable pressure drop p is 0.5 bar.

1. A positive pressure dilute-phase pneumatic transport system is used to transport catalyst particles with a mean particle size x=200m and particle density (p)=2250kgm3 across a horizontal distance of 200 metres using ambient air density f=1.2kgm3. The required flow rate (Mp) of the granules is 600kgh1. An initial choice of a pipe with an internal diameter, D=50mm was made in the initial stages of the design. The maximum allowable pressure drop p is 0.5 bar. uesiyi. [2 MARKS] Additional Information: Useful equations: p1p2=21fUf2+21p(1)Up2+FgwL+FfpL+pL(1)gsin+fLggsinUsalt=(f4Mp10g2D22)+11=1400x+1.96=1100x+2.5 Mass flow rate of solids: Mp=AUp(1)p For horizontal sections: Up=U(10.0638x0.3p0.5)FpwL=D2fp(1)pUp2L Hinkle (1953) correlation: fp=83pfCd(UpUfUp)2fg=0.079Re0.25Cd=Rep24forRep>118.5Rep0.6if1