Re: Mbm (Meat & Bone Meal) - Pneumatically Unloading Bulk Trucks
From what I have seen with MBM (or Dead Mad Cow as known in the UK), the flow properties are best suited to mechanical transfer in to, and out of, storage. It will compact, can have a high angle of repose and can stubbornly refuse to flow out of discharge openings. One thing the stuff I have seen is not, and that's anything like the cement you are used to.
There must be good reasons why most use walking floor or tipper trailers. ■
Re: Mbm (Meat & Bone Meal) - Pneumatically Unloading Bulk Trucks
Originally posted by designer
It will compact, can have a high angle of repose and can stubbornly refuse to flow out of discharge openings.
Hmm.. Thanks for the reply. That's what I was concerned with. I have heard of a few conveying the stuff pneumatically, but rumors are all I have to go on at this point. I'm convinced that chilling the blower air could lead to a positive outcome, the question is how, and is it economical? Hopefully someone on this board has seen the stuff pneumatically conveyed whether successfully or unsuccessfully.. ■
Re: Mbm (Meat & Bone Meal) - Pneumatically Unloading Bulk Trucks
MBM can be transferred from bulk tankers into silos. There are 2 installations in UK which I know are getting bulk tanker deliveries and MBM gets pneumatically conveyed into a silo and then loss in weight feeder injects pneumatically at control rate as an alternative fuel. The “40 degree” fat melting and blocking the lines is a myth I have seen coming in tankers at 45 degrees with no problems. But the conveying air in these installations is chilled with pre-cooler and an after cooler. ■
Re: Mbm (Meat & Bone Meal) - Pneumatically Unloading Bulk Trucks
Evan
There are many applications in pneumatic conveying where materials are temperature sensitive and require cooling of the blower discharge air before entraining the product. A classical example is the conveying of plastic pellets.
There are several choices for cooling of the air. Coolers / Chillers can be placed on the intake side of the blower or on the discharge side. Coolers can be water cooled or air cooled. Closed loop systems can be set up to minimize the total water consumption. If water and ambient temperature are a concern, the coolers/ chillers can be a recirculating glycol type or even a refrigerant condenser type.
The 5% moisture can be problematic depending whether it's inherent or free moisture. There are techniques such as using flexible hose for the conveying line to help mitigate product build-up, etc.
Your requirement is not insurrmoundable but will require some detailed considerations with respect to the storage and conveying parameters. ■
Re: Mbm (Meat & Bone Meal) - Pneumatically Unloading Bulk Trucks
During the last Foot & Mouth epidemic in Britain a major part of the national herd was incinerated. To facilitate disposal of the products the authorities chose to ignore the statutory transport regulations.
If there is any biological hazard involved the 'peactime' situation will not be so lenient. Make sure you can transport the stuff along the route you select. I would also recommend you clean out the tubs before filling them with concrete. ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Re: Mbm (Meat & Bone Meal) - Pneumatically Unloading Bulk Trucks
Originally posted by Mantoo
There are 2 installations in UK which I know are getting bulk tanker deliveries
epeters,
If there is direct experience in the UK it would be worth the effort in trying to contact them. No point in re-inventing the wheel. ■
MBM (meat & bone meal) - pneumatically unloading bulk trucks
Hello All,
I'm currently looking into the feasability of burning MBM (meat & bone meal) at our plant as an alternate fuel. I've had good feedback regarding the mechanical transport of the MBM from the storage silo to the burning line, however, I'm running into a hiccup when it comes to transporting it from the trucks to the storage silo pneumatically.
Most outfits that use MBM transport it using walking floor trailers or dumpers, but as we use bulk tankers to move our product (cement) we want to use the same type of truck to transport the MBM. The catch is that it would require pneumatically conveying the MBM from the trucks into the storage silo.
MBM resembles sawdust, but has the following characteristics:
Moisture up to 5%
Fat content up to 13%
The main consideration for pneumatically conveying the MBM is temperature. The MBM must be kept at a temperature around 30 degrees C, no greater than 40 degrees C. At warmer temperatures, due to the fat content, the material becomes sticky and will certainly not convey as intended.
My questions are:
Has anyone had any experience pneumatically conveying this type of material? What solutions were conceived to chill the blower air in order to maitain reasonable temperature? What other problems should be considered when conveying this type of material?
Any insight would be much appreciated,
Evan Peters ■