Transporting high-temperature red charcoal by wind power

Recently, there have been quite a few requests for help regarding wind delivery systems, and they are all relatively obscure. A few days ago, there was a post asking for the transfer of 6 tons per hour of rice husks into the boiler – that’s absolutely ridiculous.

It’s high-temperature; pressure transmission should be used.

You can also have a pot of drink before finding the answer! :lol

Horizontal + vertical – won’t it break?

Is the final vertical segment upward or downward? It would be better to change it from upward to downward; the output port can be raised by 5M, and then transportation can be achieved using ramp pipes combined with air flow!

I don’t understand this process: is it such that the charcoal is cooled by air flow, while at the same time the cold air is heated? Doesn’t the charcoal continue to burn during this air flow process?

It is charcoal resulting from high-temperature decomposition; it has not reached the point where it can burn. Moreover, the transportation distance is very short, only about twenty meters.

It is best to use N2 for delivery; otherwise, burning damage may occur

This post was last edited by arpcd on 2015-9-13 at 14:21. I have implemented more than 10 systems for the pneumatic transport of high-temperature powders with temperatures exceeding 600°C; I’d like to offer some suggestions and ideas to the original poster (since the information you provided is incomplete, I can’t give many details). ) 1. It is recommended to transport under fully sealed negative pressure conditions for safety; it certainly wouldn’t be fun if charcoal at several hundred degrees flew out and injured people ； :Lol. 2. This process is a typical example of pneumatic conveying combined with medium cooling – that is, the medium needs to be cooled simultaneously during transportation. In the projects I’ve worked on, the conditions were even more demanding than those described by the original poster, and the distance involved was greater (40 meters). The process requirement was that powders at a temperature of 600°C had to be cooled down to below 65°C before they could be stored in the storage silos ； Redwood charcoal is prone to breaking, and it may be necessary to install equipment such as grating plates or lump crushers at its discharge outlet. 3. For the reason mentioned in point 2, the selection of air volume is particularly important; two requirements must be met simultaneously. The first is the gas-solid ratio in pneumatic conveying, that is, the ratio of the mass flow rate of air to that of solid charcoal. This ratio is an important parameter for pneumatic conveying, and it generally needs to be above a certain value for conveying to be possible. The second requirement is that, in order to meet the needs of cooling the charcoal and heating the air, there must be limits on the amount of air used. I’m not sure whether it’s more important to cool the charcoal or to raise the air temperature to 120°C. If raising the air temperature is more important, then one can only wish the person in question good luck, because if such a temperature rise is required, then the amount of air available will be limited. If this limitation prevents meeting the required gas-solid ratio – for example, if the required gas-solid ratio is 5 while the amount of air available allows only a ratio of 3 – then unfortunately, pneumatic conveying isn’t an option; it’s necessary to cool the charcoal first to raise its temperature to 120°C, and then use another method to transport the cooled charcoal. 4. The pneumatic conveying + medium cooling process involves complex calculations, as the process calculations require the determination of the volumetric heat transfer coefficient. The volumetric heat transfer coefficient refers to the amount of heat transferred per unit volume (i.e., the volume of the pneumatic conveying pipeline), and its unit is kcal/m3·°C. Compared to the surface heat transfer coefficient of heat exchangers (note the units), its calculation is significantly more complex; in such cases, empirical data or formulas are often used (many suppliers keep these details confidential). The formula is: Q = Heat released by charcoal = Heat required to raise the air temperature = K × Volume × Pipeline volume × Logarithmic temperature difference. In this formula, Heat released by charcoal and Heat required to raise the air temperature are easy to calculate, but the value of K is difficult to determine. Without knowing K, it’s impossible to determine the volume, and the volume is directly related to the diameter of the pipeline. The pipeline diameter determines the flow rate, which in turn affects the gas-solid ratio in pneumatic conveying as well as the choice of fan. . 5. The pneumatic conveying + medium cooling process itself is a set of multi-variable, interdependent equations; solving these equations requires sufficient amount of basic data and conditions, as well as some experience. Compared to that post about rice husk conveying, this task is more difficult – rice husk conveying is actually quite simple; it’s just that those working in the chemical industry are not familiar with it, while technicians from grain, oil, food, and wine factories are very familiar with it. . Finally, if the original poster can provide more detailed data and explanations, this process can offer you some empirical data for reference.