2 replies to this topic

[boffin]

I have to design a low temperature water gas shift reactor, which has the following reaction

CO + H2O <-> CO2 + H2

The feed is 1786.76 kg/hr

The mass balance is in the attached file. 

 

The conversion rates are

CH4 0.96

C2H6 1

C3H8 1

CO (HTS) 0.97

CO (LTS) 0.999

 

Can someone please help me design the reactor vessel, I need to know the height and diameter, it is a packed bed reactor using a CoMo catalyst. 

 

Thank you.

Attached Files

•  Mass Balance for WGS Reactor.docx   18.95KB   22 downloads

[Steve Ransome]

I would suggest you contact a catalyst company for this, assuming you are in industry and not a student, they will be more than willing to help. If you are a student, this is less likely, they may provide some help, if you happen-chance on somebody willing.

 

For a HTS catalyst, you will find they are typically iron based, whilst LTS catalysts are typically copper based.

 

For the vessel design, you need to consider the bed size, wrt to the pressure drop (use the Ergun equation) that you want to achieve to ensure good distribution and hence good conversion. This will give you the overall vessel dimensions. Don't forget to consider the inlet distributor and outlet collector. The collector needs to be designed so that the outlet pressure drop is not too significant. You should also consider temperature measurement and catalsyt support (often achieved using graded alumina balls - high purity (low silica) in the case of HTS).

 

There is insufficient information in your document to provide an answer as you have not supplied the required inlet/outlet temperatures.

 

Typically exit concentrations (on a molar/volume basis) would be 3 mol% (dry) for HTS and 0.3 mol % (dry) for LTS. Clearly this is dependant on several factors, including temperature and ATE (or catalyst activity).

 

I hope the above is of some help to you.

[boffin]

I would suggest you contact a catalyst company for this, assuming you are in industry and not a student, they will be more than willing to help. If you are a student, this is less likely, they may provide some help, if you happen-chance on somebody willing.

 

For a HTS catalyst, you will find they are typically iron based, whilst LTS catalysts are typically copper based.

 

For the vessel design, you need to consider the bed size, wrt to the pressure drop (use the Ergun equation) that you want to achieve to ensure good distribution and hence good conversion. This will give you the overall vessel dimensions. Don't forget to consider the inlet distributor and outlet collector. The collector needs to be designed so that the outlet pressure drop is not too significant. You should also consider temperature measurement and catalsyt support (often achieved using graded alumina balls - high purity (low silica) in the case of HTS).

 

There is insufficient information in your document to provide an answer as you have not supplied the required inlet/outlet temperatures.

 

Typically exit concentrations (on a molar/volume basis) would be 3 mol% (dry) for HTS and 0.3 mol % (dry) for LTS. Clearly this is dependant on several factors, including temperature and ATE (or catalyst activity).

 

I hope the above is of some help to you.

Thank you!