What is the conveying distance, Horizontal / vertical and number of bends?

PSD of coarse Calcium Carbonate will help?

GM 90 is a big beast with a range of 90 – 200 kw depending on the pressure differential required.

Give some details of your system to get some meaning full advice. ■

Dear mr hamsterhigs69

An Aerzen rotary blower GM90S can only deliver 90 m3/min of free air at a pressure increase of 500 mbar (If running at full rpm)

The amount of coarse carbonate which can be conveyed depends on the layout of the pneumatic conveying installation. (pipe diameter, length, elevation, bends) and the particle size distribution of the carbonate.

Is your system a vacuum- or a pressure system?

Without the full scope of information it is not possible to address the problem which you seem to have.

With the full scope of information, we can try to help you (and learn from your case)

In vacuum conveying a GM90S is a small machine. I worked with GMb 20.21 blowers in grain unloaders, consuming 750 kW and even those were not the biggest ones.

with friendly greetings

teus ■

Dear Teu i have a similar problem.

Can i have your contact details so i can discuss the things with you ■

Dear gukhan,

You can use the "private message' option of this forum.

best regards ■

Dear Mr. Teus,

I have post my problem and aqddressed to you.

PLs see n reply.

Regards

Ghazanfarullah Khan ■

I seem unable to understand blower performance curve.I do not know the relationship between deltaT(temperature),pressure and flow rate.We have bellow condition,

Suction temperature:40Degc

Discharge temperature:90Degc

Discharge pressure:300bar

RPM:1500

In above mentioned condition how mush our flow rate will be?

What would happen if the temperature reach 110Degc? ■

Dear HAMIDREZA,

The Aerzen blower GM-90S is for a maximum pressure of 1.0 bar (1000 mbar) and 2400 rpm.

In the performance curve, the rpm is given along the x-axis.

If you go upwards at 1500 rpm, you will meet a set of straight lines for a given pressure drop.

From the 300 mbar (not 300 bar as you indicate) line intersection you go to the left where you find the corresponding airflow along the y-axis.

Recalculating the data, which you have given, the airflow should be approx. 55.2 m3/min and the outlet temperature should be approx. 69 degrC.

However, you state an outlet temperature of 90 degrC, which is too high for a pressure of 300 mbar.

This indicates a too high internal leakage or a blocked inlet filter. (or a malfunctioning thermometer).

Check the internal rotor clearances and the inlet filter.

A too high temperature increase deforms the cylinder and might cause ceasing of the rotors.

A too high temperature is also a problem for the lubrication oil.

Take care

Teus ■

Dear Expert,

Thank you so very much for your time and support.

I need your reply at the earliest as we may have an issue.Please let me have more details today.

How do you find the temperature is 69Degc from the graph?

Our suction temperature is about 30-40Degc and our discharge temperature is 90-110Degc.

How much shall be the motor amp?

I have one more question regarding seal and N2 nozzle applied on the seals.

Please let me know why we shall use this nozzle?

How much the pressure of this line shall be?

Our dis. pressure is 300mbar,so what is the pressure of N2?

Please kindly explain the purpose of this line so that we will be able to use properly.

What is the relationship between N2,Discharge and Suction Pressures?

Appreciating your assistance in advance and looking forward to hearing from you today.

Best Regads

Hamidreza Ghanavaty ■

Dear Hamidreza,

If you go upwards at 1500 rpm, you will meet a set of temperature lines for a given pressure drop. At the intersection of the 1500 rpm line, you can read the temperature.

I calculated the temperature.

You can also read the temperature from the Aerzen table.

The required shaft power should be approx. 35 kW at 0.3 bar.

The amperage cannot be estimated, as the Amps are depending on the voltage and the power factor, which we do not know.

Please, explain more on the seal and the N2 nozzle, because I am not aware of what is meant.

Have a nice day

Teus ■

Originally Posted by HAMIDREZA

Dear Expert,

Thank you so very much for your time and support.

I need your reply at the earliest as we may have an issue.Please let me have more details today.

How do you find the temperature is 69Degc from the graph?

Our suction temperature is about 30-40Degc and our discharge temperature is 90-110Degc.

How much shall be the motor amp?

I have one more question regarding seal and N2 nozzle applied on the seals.

Please let me know why we shall use this nozzle?

How much the pressure of this line shall be?

Our dis. pressure is 300mbar,so what is the pressure of N2?

Please kindly explain the purpose of this line so that we will be able to use properly.

What is the relationship between N2,Discharge and Suction Pressures?

Appreciating your assistance in advance and looking forward to hearing from you today.

Best Regads

Hamidreza Ghanavaty

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Dear Mr. Ghanavaty,

You will get answers to all of your questions in my article "Moving Air in Pneumatic Conveying Systems" published by Chemical Engineering magazine in its September 2011 issue. Let me know if you need its copy.

Regards,

Amrit Agarwal

Consulting Engineer

Pneumatic Conveying Consulting

Email: polypcc@aol.com ■

Dear Amrit,

This is my pleasure to have the copy of the mentioned magazine.

Best Regards

Amin498@gmail.com ■

Dear Mr Amrit,

Thank you so very much for your valuable article which helps us a lot.This is fully understood with the help of your great article.

The most important problem we are facing with is damaged inlet filter.Afterward,the powder will come into blower chamber and finally premature failure of our unit.We do not know how to find the intake filter is damaged earlier than blower big failure.

I will post my comments on Bulk Online Forum as well.

Another issue we are facing with is high vibration on our unit.We have suspicious if the cause is entering powder or other mechanical issues.

Having informed earlier,the most important problem is powder comes into blower chamber after damaging the inlet filter.

Again thank you so very much for your valuable article.

Best Regards

Hamidreza Ghanavaty ■