Dear mechanicalconsultant,

Start with visiting the following links:

Pneumatic conveying, Performance and Calculations:

https://news.bulk-online.com/?p=65

Dense phase- or dilute phase pneumatic conveying:

https://news.bulk-online.com/?p=238

Pneumatic conveying, turbo- or positive displacement air mover:

https://news.bulk-online.com/?p=309

Energy consumption per ton of a pneumatic conveying system:

https://news.bulk-online.com/?p=331

Pneumatic conveying, an unexpected relationship.

https://news.bulk-online.com/?p=445

Influence of electro static charge on pneumatic conveying.

https://news.bulk-online.com/?author=15

Forget about the thumb rules in respect of pneumatic conveying.

The number of involved parameters and their interrelated dependency is the reason that they do not exist.

Success

Teus ■

Originally Posted by Teus Tuinenburg

Dear mechanicalconsultant,

Start with visiting the following links:

Pneumatic conveying, Performance and Calculations:

https://news.bulk-online.com/?p=65

Dense phase- or dilute phase pneumatic conveying:

https://news.bulk-online.com/?p=238

Pneumatic conveying, turbo- or positive displacement air mover:

https://news.bulk-online.com/?p=309

Energy consumption per ton of a pneumatic conveying system:

https://news.bulk-online.com/?p=331

Pneumatic conveying, an unexpected relationship.

https://news.bulk-online.com/?p=445

Influence of electro static charge on pneumatic conveying.

https://news.bulk-online.com/?author=15

Forget about the thumb rules in respect of pneumatic conveying.

The number of involved parameters and their interrelated dependency is the reason that they do not exist.

Success

Teus

Dear sir

Hope you are fine

My qury is

1) what is the value of wall shear angle for fly ash as based on your previous experience? . ■

Originally Posted by Teus Tuinenburg

Dear mechanicalconsultant,

Start with visiting the following links:

Pneumatic conveying, Performance and Calculations:

https://news.bulk-online.com/?p=65

Dense phase- or dilute phase pneumatic conveying:

https://news.bulk-online.com/?p=238

Pneumatic conveying, turbo- or positive displacement air mover:

https://news.bulk-online.com/?p=309

Energy consumption per ton of a pneumatic conveying system:

https://news.bulk-online.com/?p=331

Pneumatic conveying, an unexpected relationship.

https://news.bulk-online.com/?p=445

Influence of electro static charge on pneumatic conveying.

https://news.bulk-online.com/?author=15

Forget about the thumb rules in respect of pneumatic conveying.

The number of involved parameters and their interrelated dependency is the reason that they do not exist.

Success

Teus

Kind attention :- Mr Teus

Dear sir

1) What is the effect and implication of presence of silica in fly ash for pneumatic conveying system ?

2) Based on your experience , what is the wall shear angle / wall friction angle of fly ash ?

3) In vacuum conveying system (from ESP to bag filter buffer hopper) , which location vaccum is more ? at pickup point or suction of vaccum pump . I presume , it must be on pickup point . Please correct me ■

Originally Posted by mechanicalconcultant

I want to clear full fundamental of pneumatic conveying .Please give link of ebook for understanding of variety of pneumatic conveying in cement plant viz. dense phase, lean phase, pneumatic screw pump

Also let me know please, Thumb rules for pipe sizing and conaveying air requirement for above said equipment



Regards

==========================================================================================

You have to do the following before you get any further with your needs.

Fist things first, You have to read and understand the six laws of gasses,

then you need to physically purchase a textbook regarding this method of conveying materials from Mcgraw Hill or another publisher. ■

Dear kj,

In pneumatic conveying, the important parameters are the suspension velocity and the Solid Loss Factor.

All materials in the fly ash influence these parameters.

The effect of the silica (also depending on the concentration) is unknown.

Each fly ash should be tested in respect to pneumatic conveying properties.

Use 0.5 as an approximation. This value is on the safe side and due to the fact that this parameter is only active in a bend, the influence on the total pressure drop is very limited.

Measuring the wall friction factor is advised.

Air- and material flow is in the direction from a high absolute pressure to a low absolute pressure.

In a vacuum system, the “high absolute pressure” is the atmospheric pressure at the pickup point and the “low absolute pressure” is the vacuum at the vacuum pump intake.

Your assumption that the vacuum pump is applied to create the highest absolute pressure in a vacuum system is curious.

How can the vacuum pump at the end of a system create the lowest absolute pressure at the beginning of the system?

(Are you confusing a pressure system with the compressor at the beginning of a pipeline with a vacuum system with the vacuum pump at the end of the pipeline?)

Consider the advice of Mr Izaharis:

Have a nice day

Teus ■

Originally Posted by Teus Tuinenburg

Dear kj,

In pneumatic conveying, the important parameters are the suspension velocity and the Solid Loss Factor.

All materials in the fly ash influence these parameters.

The effect of the silica (also depending on the concentration) is unknown.

Each fly ash should be tested in respect to pneumatic conveying properties.

Use 0.5 as an approximation. This value is on the safe side and due to the fact that this parameter is only active in a bend, the influence on the total pressure drop is very limited.

Measuring the wall friction factor is advised.

Air- and material flow is in the direction from a high absolute pressure to a low absolute pressure.

In a vacuum system, the “high absolute pressure” is the atmospheric pressure at the pickup point and the “low absolute pressure” is the vacuum at the vacuum pump intake.

Your assumption that the vacuum pump is applied to create the highest absolute pressure in a vacuum system is curious.

How can the vacuum pump at the end of a system create the lowest absolute pressure at the beginning of the system?

(Are you confusing a pressure system with the compressor at the beginning of a pipeline with a vacuum system with the vacuum pump at the end of the pipeline?)

Consider the advice of Mr Izaharis:

Have a nice day

Teus

Dear sir

I came across important point in regard of pneumatic fly ash conveying system

Apparently the fly ash from precipitator has been proposed (by client) to convey up to intermediate fly ash silo and then further from intermediate silo to remote silo . Two stage conveying system by dense phase

Parameter 1 Distance

a) Esp to intermediate silo :- 300mtr

b) Intermediate silo to remote silo :- 900mtr (900mtr Horz , 30 vert)

2 Fly ash capacity :- 250 TPH

3 Temp :- 150 Deg c

Now in attempt explore more optimization of system , I am proposing single stage conveying from ESP to remote silo which is 1200mtr conveying distance (1200 Horz, 20 vertical) .

Now my quiry is

1) Please suggest , whether the explored optimization of single stage will be more advent as against two stage ?

2) What will be the process and maintenance disadvantage of single stage if any ? ■

Originally Posted by Teus Tuinenburg

Dear kj,

In pneumatic conveying, the important parameters are the suspension velocity and the Solid Loss Factor.

All materials in the fly ash influence these parameters.

The effect of the silica (also depending on the concentration) is unknown.

Each fly ash should be tested in respect to pneumatic conveying properties.

Use 0.5 as an approximation. This value is on the safe side and due to the fact that this parameter is only active in a bend, the influence on the total pressure drop is very limited.

Measuring the wall friction factor is advised.

Air- and material flow is in the direction from a high absolute pressure to a low absolute pressure.

In a vacuum system, the “high absolute pressure” is the atmospheric pressure at the pickup point and the “low absolute pressure” is the vacuum at the vacuum pump intake.

Your assumption that the vacuum pump is applied to create the highest absolute pressure in a vacuum system is curious.

How can the vacuum pump at the end of a system create the lowest absolute pressure at the beginning of the system?

(Are you confusing a pressure system with the compressor at the beginning of a pipeline with a vacuum system with the vacuum pump at the end of the pipeline?)

Consider the advice of Mr Izaharis:

Have a nice day

Teus

Dear sir

I came across important point in regard of pneumatic fly ash conveying system

Apparently the fly ash from precipitator has been proposed to convey up to intermediate fly ash silo and then further from intermediate silo to remote silo

Parameter

1) Distance

a) Esp to intermediate silo :- 300mtr

b) Intermediate silo to remote silo :- 900mtr

2) Fly ash capacity :- 250 TPH

3) Temp :- 150 Deg c

Now in attempt explore more optimization of system , I am proposing single stage conveying from ESP to remote silo which is 1200mtr conveying distance .

Now my quiry is

1) Please suggest , whether the explored optimization of single stage will be more advent as against two stage ?

2) What will be the process and maintenance disadvantage of single stage ?

jk ■

Dear kj,

The double-stage installation calculates as follows:

1st stage:

Compressor: 2x Aerzen VM75 at 7500 rpm

Pipe diameters: 16”/18”

Capacity: 278 tons/hr at 2.5 bar

Energy consumption: 1.63 kWh/ton

2nd stage:

Compressor: 2x Aerzen VM85 at 8275 rpm

Pipe diameters: 20”/24”

Capacity: 295 tons/hr at 2.5 bar

Energy consumption: 2.29 kWh/ton

Total energy consumption: 1.63 + 2.29 = 3.92 kWh/ton

The single stage installation calculate as follows:

Compressor: 3x Aerzen VM75 at 8275 rpm

Pipe diameters: 24”/28”

Capacity: 317 tons/hr at 2.5 bar

Energy consumption: 2.53 kWh/ton

These calculations are intended as an indication and are not intended as a design.

Have a nice day

Teus ■

Originally Posted by Teus Tuinenburg

Dear kj,

The double-stage installation calculates as follows:

1st stage:

Compressor: 2x Aerzen VM75 at 7500 rpm

Pipe diameters: 16”/18”

Capacity: 278 tons/hr at 2.5 bar

Energy consumption: 1.63 kWh/ton

2nd stage:

Compressor: 2x Aerzen VM85 at 8275 rpm

Pipe diameters: 20”/24”

Capacity: 295 tons/hr at 2.5 bar

Energy consumption: 2.29 kWh/ton

Total energy consumption: 1.63 + 2.29 = 3.92 kWh/ton

The single stage installation calculate as follows:

Compressor: 3x Aerzen VM75 at 8275 rpm

Pipe diameters: 24”/28”

Capacity: 317 tons/hr at 2.5 bar

Energy consumption: 2.53 kWh/ton

These calculations are intended as an indication and are not intended as a design.

Have a nice day

Teus

Sir

Tonnage of thanks

My quiry in previous thread was majorly to identify the system reliability with single stage conveying system. Yet , this subject would have already discussed quite times in forum but would have not be galvenized with latest technology and practice evidence . Now i once again put following quiry in regard of single stage conveying system for 1.5 km for conveying capacity 250tph

1) Is the proposed system (single stage ) will be practically workable .? . If we have to make it work , then what are the great care needs to be taken while designing the system?

2) What will be the advantage of single stage over double stage in light of operational, functional, maintenance?

3) Would you to enclose the design sheet (pdf) for the calculation made above ?

4) I been advised by one of contractor to use internal by pass pipe (Pipe in pipe) to convey the system in dense phase for 1.5km. In this system long plug will be broken into short slug and hence as being high air retention will be successfully conveyed . I would like to be advised by you , whether this technology (pipe in pipe) will work or not ? . If we have to make it work , then what is extra points we need to take care? ■

Dear kj

The single stage installation calculate as follows:

Compressor: 3x Aerzen VM75 at 10198 rpm

Pipe diameters: 24”/28”

Double tank system: Tank volume = 40 m3 – Material volume = 34 m3

Capacity: 300 tons/hr at 2.5 bar

Energy consumption: 2.81 kWh/ton

These calculations are intended as an indication and are not intended as a design.

Use a reputable and experienced consultant or supplier.

Half the number of components.

I calculated at velocities between 7 and 14 m/sec that approx. 27 tons of fly ash is underway in the pipeline.

Whether a plug conveying system over 1.5 km will work, I do not know, as I have no experience with this type of conveying.

Let the contractor convince you.

Success

Teus ■