4 replies to this topic

[Gole]

I want to design a heat exchanger/ heater for a gas stream where the inlet conditions range are 40 deg C and 79 bar and a flowrate of around 400kg/hr or a 460Nm^3/hr flow.

The gas compostions are as following (in mol%),

CO2- 2.08000000000000e-002

Nitrogen - 2.22000000000000e-002

Methane - 0.783800000000000

Ethane - 9.46000000000000e-002

Propane - 4.98000000000000e-002

i-Butane - 9.10000000000000e-003

n-Butane - 1.23000000000000e-002

i-Pentane - 2.70000000000000e-003

n-Pentane - 2.10000000000000e-003

n-Hexane - 6.00000000000000e-004

n-Heptane - 7.00000000000000e-004

n-Octane - 8.00000000000000e-004

n-Nonane - 5.00000000000000e-004

 

The desired outlet temperature needs to be 70 Deg C and a normal pressure drop of upto 1.5 bar is allowable. These inlet conditions may seem very unrealistic or a bit odd, but it is currently being used in a industry I currently work in. Are there any type of exchangers that may be used in the process of gas heating for relatively small flowrates which may be efficient?

Thank You!

[breizh]

Hi,

You wrote Mole% and you gave composition using other units .......! 

 

Pressure in absolute?

What is the heating source?

What kind of technology do you use in your industry?

More info better answer.

 

https://www.pdhonlin...m371content.pdf

CheCalc ‐ Heat Transfer

 

Breizh 

[Gole]

Sure breizh, my bad. Here are some other detailed specs you migh need to share some valuable information

 

1) Mass Flow Compositions (in kg/hr):- 

 

CO2 18.17

Nitrogen 12.34

Methane 249.6

Ethane 56.4

Propane 43.59

i-Butane 10.50

n-Butane 14.19

i-Pentane 3.86

n-Pentane 3.0

n-Hexane 1.0

n-Heptane 1.3

n-Octane 1.8

n-Nonane 1.2

The overall phase is gaseous.

 

2) Yes, the pressure in absolute and not gauge.

 

3) Currently block heaters are used in my industry which use emf wound coils for gas heating, but I wonder if any other heat exchangers can be used for the same? 

 

I am totally proficient in using edr especially designing STHE's and PHE's. However I feel that maybe a better type of heat exchanger than a Shell and Tube heat exchanger can be used for heating or even a STHE can be considered for such small flowrates in the first place!

 

Hope this helps, feel free to ask for more info. 

 

PS: As such no size restrictions are in place unless it is greater than a combined area of 2m*2m.

 

Thank You!

 

 

Hi,

You wrote Mole% and you gave composition using other units .......! 

 

Pressure in absolute?

What is the heating source?

What kind of technology do you use in your industry?

More info better answer.

 

https://www.pdhonlin...m371content.pdf

CheCalc ‐ Heat Transfer

 

Breizh 

[breizh]

Hi,

You may want to consider a compact heat exchanger. 

Prepare a specification sheet and submit it to vendors.

https://www.alfalava...-ppi00324en.pdf

https://www.alfalava...gers/compabloc/

Good luck

Breizh 

[Said Salim]

Hi,

What heating media which will be used?
Is a saturated steam?


Said