MOCS

Mike HobbsMike SteeleMike McGannScott DanielsJames Linder

PBL-7-98

Chemical Heat Pump

Topics of Discussion

Problem Statement

Given

Required

Solutions

Problem Statement

Analysis of Chemical Heat Pump

Analysis of Cooling Tower

Analysis of Boiler

Flash tank

Heat exchangerExothermicreactor

Distillation column

endo reactor

Flash tankH2Acetone2-Propanol

H2

condenser

MIXED

Acetone

H2

Acetone2-prop

Compressor 1

Pump 1

Compressor 2

Liquid

gas

Reduction valve

water

Hot airCool air

Pump 2

Air 79 % N2 21 % O2

Natural gas

Combustion gassesCO2, H2O, N2, O2T= 375 F

BFW

SS

CR

BOILER

reboiler

Cooling tower

Ambient air85 F80 % RH

CWR 103 F

Exit air

Pump 3

CWS 75 F

COOLING TOWER

MOCSWORKING DIAGRAMPBL-7-98

WATER

2- prop & acetone

Given: Chemical Heat Pump

Diameter of L1 = 6.35 mm

Average Velocity = 10 m/sec

Temperature L6 = 200 C

Mole composition of L1= .97 2-Propanol

Mole composition of L5= .02 2-Propanol

Given: Chemical Heat Pump (continued)

Hot Air going into Endo 23.8 C

Relative Humidity 80 %

Cool Air coming out of Endo 15.5 C

Required: Chemical Heat Pump

Energy Supplied into Endo Reactor (Qin)

Diameter of L6

Partial Pressures of L6

Amount of Water Condensed in Endo

Endo Reactor

Q in

Hot air

Nextpage

L 202

L 2

L 201

Acetone2- Prop

L 3Condenser

L 5

L 4

L 803

Water

Cool air

L 303

Pump 2

L 1L 101

H2

Re-boiler

Reduction valve

Acetone2-Prop

L 801

CWR

Flash Tank 1

DistillationColumn

Analysis: Chemical Heat Pump (Endo)

Qin = 353000 Btu/ hr (29 ton unit)

Water Condensed 168 lb/hr (21 gal/hr)

Exothermic Reactor

L 202 L 203Compressor 1

L 5Pump 1

ExoReactor

L 6L 501 Acetone

Heat ExchangerL 7

L 802

L 801

Gas

Compressor 2

L 8

L 804

H2

H2

Acetone2-Propanol

Flash Tank 2

H2

Analysis: Exothermic Reactor

Diameter of L6 = 29.0 mm

Partial Pressure: 1.96 ATM Acetone

0.04 ATM 2-Propanol

Given: Cooling Tower

Cold Water Return 39.4 C

Cold Water Supply 23.8 C

Input Ambient Air 29.4 C

Relative Humidity 80 % (Ambient Air)

Exit Air 30.5 C RH 90 %

Given: Cooling Tower (continued)

Diameter for CWS and CWR: 0.05 m

Cooling Tower

CWR103 FCooling

Tower

Ambient Air85 F80 % RH

L 301

L 302

Exit Air

Pump 3

WaterL 303CWS 75 F

Required: Cooling Tower

Velocity for Cold Water Supply

Velocity for Cold Water Return

Pounds of Dry Air from Cooling Tower

Analysis: Cooling Tower

Velocity of Cold Water Supply: 1418.0 m/hr

Velocity of Cold Water Return: 1425.0 m/hr

Pounds of Dry Air: 34,600 lb dry air/ hr

Given: Boiler

Steam Supply 220 psig (q=1)

Cold Return (q=0)

Temperature of Exit Gas 190.5 C

Combustion Gasses: CO2, H2O, N2, O2

Excess Air 40 %

Given: Boiler (continued)

Diameter for SS and CR: .05 m

Boiler

Boiler Feed WaterBoiler

CombustionGassesCO2,H20,N2,O2

L 901L 903

CR

SS

Natural GasAir79 % N221 % O2

T= 375F

L 902

Required: Boiler

Velocity of Steam Supply

Velocity of Cold Return

Flow Rate of Natural Gas

Percent Composition of Exit Gasses

Analysis: Boiler

Velocity Steam Supply: 3960.0 m/hr

Velocity Cold Return: 36.7 m/hr

Amount of Natural Gas: 3.51 tons/month

Analysis: Boiler (continued)

Composition of Flue Gasses:

CO2 = 7.0 %

H20 = 13.9 %

O2 = 5.6 %

N2 = 73.5 %

Questions