Leather Waste Collection
If you intend to use the three inch pipe for waste
dust from buffing you will need to consider a large enough rotary lobe or screw lobe blower with a three inch inlet and outlet-480-600 volt 3 phase electrical connections to handle the vacuum needs in a dilute phase conveying scenario.
Complete units/systems are available and all you need to do is contact your local Roots Blower or Gardner Denver distributor to buy a pre[packeaged unit ready to work-save your self a lot of headaches and work.
lzaharis
Remeber your number 1 enemy is air leakage going into the piping system from the outside from a bad weld, gasket, pin hole leak, bad thread etc. and that will reduce efficiency and HG readings. Just be sure to buy a milk house vacuum gauge to be able to check your HG at the inlet occasionaly to make sure its running ok. ■
Question Still Outstanding
Lzarahis,
I appreciate your insight and recommendation to develop a new blower system, however, my client is limited on funds and is using existing blowers. These blowers will be configured into a header system with the majority of the air being supplied to the buffers and a small portion being used to transport the dust from the bottom of the dust collector to the pelletizer. This is why I need to be able to calculate the required cfm to transport the dust. Again, the dust mass flow rate and density are known and the 3" is the starting point.
My question is still outstanding. ■
Dust
look at all the name plates on the air movers-if they still exist- other wise you will have to measure each blowers volume to gather the totals for air volume moved/used. ■
Re: Cfm Required
I have all the nameplate information and know the cfm that is required to supply air to the buffers.
I hate to be dense, but the question is this: How do I calculate the cfm required to move the 132 lb/hr of dust? I've been doing a bit of reading and do not know about floating velocity, the resistance factors, etc. Again, I need some assistance in calculating required cfm of the blower to adequately move the 132 lb/hr a specified distance with a specified number of bends, etc. I need to be certain that the cfm supplied will be able to adequately pick up and move the particles. ■
Leather Dust
Greetings from my corner of the "Frozen Eastern Wilderness@1140 feet above mean sea level".
Kind sir you are not dense,
The blower manufacturers-if they are still a going concern can help you other wise there are many good books available at any engineering library and or M. Mulani's book will be of much help to you as both a reference and a bible of sorts regarding same- if you are short on time contact a nearby universities engineering faculty member and they will help find the formularies needed for your project- this would be the fastest way as you are dealing with gas laws and finite properties i.e. the leather dust.
The golden rule to remeber is "do not forget to factor in the altitiude and air temeperature where the system is located" because you are deailng with a low pressure atmosperic air delivery system and its quirks as related to temeperature at different times of the year.
I would definitely suggest though that you obtain a "delaval" brand milk house vacuum gauge kit to verify your initial vacuum as a reference and it will always be handy to have any way-use it once and it pays for it self in lost time doing calculations and finding vacuum leaks.
I am used to dealing with silicon laden rock dust in my previous occupation so it is pretty nasty stuff to deal with as far as vacuum, collection and disposal. ■
Cfm required
I am in the process of re-designing a dust conveying system using existing equipment (blowers, dust collector, etc.).
The material is dust from a leather buffing machine with the worst case flow at 132 lb/hr. I'm considering using a recommended velocity of 3500 ft/minute to 3700 ft/minute and a suction to pick up the material at 2.5" W.C. I'm using a density of between 7.2 to 9 lb/ft^3.
The current pipe size is 3" and I will use this as a starting point. How do I calculate the cfm requirement for blower? I'm familiar with air systems, but this is my first dust conveying system.
Thanks. ■