FLUID FLOW - PUMPS. Discharge Section. Section. Two main types of pumps: Positive Displacement pumps Centrifugal pumps.
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1 FLUID FLOW - PUMPS 4 3 Control valve Suction Section Discharge Section Two main types of pumps: Positive Displacement pumps Centrifugal pumps ChE Design I
2 FLUID FLOW - PUMP PERFORMANCE Mechanical Energy Balance: Between points and (note that these are and 4 in previous slide): Divide by g to get units of length. = +Δ + Δ F W V dp Z g o ρ ( ) = Δ + + F W V V p p Z Z g o ρ ρ h f h g V g p Z g V g p Z = Δ ρ ρ ChE Design I ChE Design I 4 3 Control valve
3 FLUID FLOW - PUMP PERFORMANCE Z: Potential or static Head P/ρg: Pressure head : Velocity head Δh: Total head of the pump h f : Head loss due to friction Note: Total head of the system: Solution of the MEB eqn. Total head of the pump: The manufacturer provides it. h f h g V g p Z g V g p Z = Δ ρ ρ g V ChE Design I ChE Design I
4 FLUID FLOW - PUMP PERFORMANCE Total Dynamic Head, TDH TDH = P d P S P d = discharge pressure P s = suction pressure Hydraulic Horsepower Shaft Efficiency W h ( hp) = Q( gpm) TDH ( psi) 74.3 Wh η = Wb W h = theoretical required power (hp) W b = actual shaft work or brake-horsepower Note: η < because there are friction losses inside the pump. ChE Design I
5 Positive Displacement pumps FLUID FLOW - PUMPS Used in cases when large pressure heads are needed.. Rotary pumps (rotating gears, lobes or screws).. Reciprocating pumps (pistons). 3. Miscellaneous (e.g. peristaltic pumps). ADVANTAGES: Self-priming. Can work in two directions. Can pump liquids with gases for a small amount of time. DISADVANTAGES: Most of them cannot operate with closed discharge. Might produce oscillations in discharge. ChE Design I
6 ChE Design I
7 ChE Design I
8 ChE Design I
9 ChE Design I
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11 Centrifugal pumps FLUID FLOW - PUMPS. Volute pumps (shell and simple impeller).. Diffuser pumps (diffuser vanes around the impeller). 3. Turbine pumps. 4. Propeller pumps. ADVANTAGES: Low cost - easy maintenance. Do not produce a lot of noise. Uniform discharge (no oscillations). DISADVANTAGES: Do not produce large heads. Do not work well with high viscosity fluids. ChE Design I
12 ChE Design I
13 ChE Design I
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16 Advantages Centrifugal pumps- Advantages and dissadvantages Volute Diffuser Turbines Propeller pumps pumps pumps Simple construction X X Quiet operation X X X X Long life-time X X Capable of pumping X X X fluids with particles Capable of pumping X fluids with gases or vapors Self-priming X No need for X X X X variable rpm motor Disadvantages Not good for high X X X X viscosity fluids Low discharge head X X X X Accurate machining X for rotor-shell required ChE Design I
17 P s = suction pressure P v = vapor pressure of fluid Fluid Flow - Pumps Available Net Positive Suction Head P P NPSHA = S V ρg ρg NPSHA has to be positive. Otherwise, the fluid enters the pump with bubbles. ChE Design I
18 Fluid Flow - Pumps NPSHA: As pressure increases inside the pump the bubbles collapse. This phenomenon is called CAVITATION and it -Reduces capacity -Damages the pump ChE Design I
19 Fluid Flow - Pumps Net Required Positive Suction Head (NPSHR) Ideal pumps will not cavitate if NPSHA is positive. However a small pressure decrease can take place in a pump due to internal losses close to the suction. ====> if NPSHA = 0 bubbles can form and cavitation takes place. ====> NPSHR is a required value suggested by the manufacturer ChE Design I Specification Criteria NPSHA > NPSHR
20 Head Capacity Curves Fluid Flow - Pumps head (P d -P S ) Rotary Centrifugal Reciprocating Positive displacement pumps give an approximate constant flow Flowrate (gpm) ChE Design I
21 Fluid Flow - Pumps Thus, centrifugal pumps are chosen because they can operate in a wider range of flowrates (better control and process flexibility) If you are stuck with a positive displacement pump, the following diagram shows how you can regulate flow. However, this arrangement will: - use more energy - heat up the fluid ChE Design I
22 Fluid Flow - Pumps Centrifugal Pump Performance Curves Δh NPHSR Want to operate somewhere here % Efficiency 60% Characteristic Curve 6 8 Impeller size ChE Design I Q (flow rate)
23 Specifying a Pump Parameters you can control when selecting the pump: impeller diameter, speed (not very common), the model Things to look for: Maximum efficiency, NPSHA > NPSHR
24 Specifying a Pump 4 3 Need to calculate: System head H S = -[(P 4 -P 3 )+(P -P )] Pump head: Hp But: Hp = Hs Hs Control valve As flow increases friction losses increase friction losses ChE Design I Static head Flow rate
25 Specifying a Pump Hs Valve closes Flowrate Effect of throttling a valve. ChE Design I
26 Specifying a Pump H Pump curve System curve Max. flow in this interval Flowrate Since Hs = Hp, pick the Hs curve close to 80% open, at maximum flow
27 What to do if NPSHA is too low NPSHA = (P -P V )/rg Increase P!!! (How?) Increase Z This is the reason why pumping fluids that are close to saturated conditions require that the vessel upstream be elevated. Flash tanks are typical examples of this. Pumps that return flow from the reboiler to distillation columns need to be bellow the column level. ChE Design I
28 Pumps in parallel: Fluid Flow - Pumps Total head: Δh tot =Δh =Δh Total flow rate: Q tot =Q +Q Pumps in series: Total head: Δh tot =Δh +Δh Total flow rate: Q tot =Q = Q ChE Design I
29 REFERENCES Pumps McCabe, W.L., Smith, J.C., and P. Harriott, Unit Operations of Chemical Engineering, 5th edition, McGraw-Hill, New York, 993. (good for pumps and other unit ops equipment) ChE Design I
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