Energy-saving drying technology – heat pump process
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This post was last edited by wiseboy on 2018-6-21 at 14:12. Nowadays, drying technology is used in a wide range of applications, such as drying sunflower seeds, and so on. However, against the backdrop of energy conservation, emission reduction, and cost cutting, many companies still use traditional drying technologies. As far as I know, there are companies in this forum that deal with drying sunflower seeds and still use 10 kilograms of steam; no heat recovery is employed, which results in high costs. Now I would like to introduce a drying process based on heat pump technology that I use; of course, it’s not something new, but it remains novel for some companies. In simple terms, it involves using a heat pump to recycle the exhaust gas after the dryer, which can **save energy**. Not only is recycling obvious, but the latent heat of the steam in the exhaust gases is also recovered. The diagram below shows an overview of this process; the temperatures and other values shown are also illustrative. The entire process can be designed in a modern way.
The hot air in this process also operates in a closed cycle, which is both environmentally friendly and energy-efficient. Corporate efficiency has improved significantly.
This post was last edited by wiseboy on 2018-6-22 at 11:41 as a placeholder; I’ll deal with it once I’m done with these tasks. I will introduce a practical example of the end-to-end design of heat pumps: from the process to the equipment. By modernizing the design process, it is hoped that energy savings and emission reductions can be achieved in the field of drying technology, thereby fostering technological progress.
Hello, expert; you can give live lectures on Haichuan University’s large-class platform. More intuitive. My WeChat is zheng0439
OP, I’m sorry, but my eyes aren’t good enough to understand it
Simply put: this is drying by direct contact between hot air and the material. The hot air at 125°C is reduced to exhaust gas at 90°C after passing through the dryer. At this point, the exhaust gas not only still possesses sensible heat at 90°C, but it also contains water vapor evaporated from the dryer, which is also a form of thermal energy. Traditional drying processes simply discharge the waste gas, which wastes the thermal energy contained in it. The purpose of a heat pump is to reuse waste gas: remove the moisture from it (otherwise, when it is used for drying again, it will be saturated with water and unable to absorb more moisture), raise its temperature to 125 °C, and reuse it.
What scary technology! ①Determine whether the latent heat of vaporization can occur at 60°C? ②Heat transfer can’t reach such a level, right? Are there any industrial examples for ③, or are it just theoretical data?
This post was last edited by wiseboy on 2018-7-9 at 13:38. It’s basic knowledge: in a gas mixture saturated with water vapor, condensation occurs when the temperature drops. Otherwise, you don’t truly know what “saturation” is. As for you saying it’s “so scary,” that’s just excessive alarm without any knowledge. As for what you mentioned, “③ Are there any industrial examples or are it only theoretical data?” I can answer you with certainty: there are manufacturers that specialize in this. There is also “① Determine the latent heat required for steam to form at 60°C?” ”——This is an even more absurd question.