所有的干燥和冷卻處理的核心是“滯留時間的概念。”工藝工程師將它定義為對于一個給定的產(chǎn)品，與指定的水分含量，粒度，物理結(jié)構(gòu)和溫度達到期望的^終狀態(tài)的干燥處理所需的時間量。在常規(guī)的或“直管”閃蒸干燥機，確定的停留時間是一個計算涉及管的長度的要被處理的材料，而移動的材料從進料排出的空氣速度，上妝。

Heyl和帕特森有Renneburg的部取代這種傳統(tǒng)的方法來干燥器/冷卻器技術(shù)，提供變量中的停留時間更短管，由于幾何高度不依賴于保留時間。在Renneburg閃蒸干燥機，將停留時間調(diào)??整的顆粒由spiroidal路徑。運營商可以增加停留時間，盡可能多的為五個因素，根據(jù)具體產(chǎn)品的要求。

常規(guī)直管閃蒸干燥機中的停留時間大約是相同的所有產(chǎn)品，無論個別物理性質(zhì)。更細的顆粒，當暴露在高入口氣體溫度，可被降解或烤。在某些情況下，熱敏感產(chǎn)品著火或引起爆炸。

與此相反，在Renneburg Rotacurrent和Venturijet閃存干燥器確保選擇性的停留時間相稱的每個產(chǎn)品的顆粒尺寸和重量，相應(yīng)spiraloid粒子軌跡的長度表示的。

的設(shè)計中，“選擇性”，這意味著同質(zhì)化的^終水分含量和高品質(zhì)的商業(yè)產(chǎn)品，沒有物理或化學降解 - 加工行業(yè)無法比擬的。

加入的直管的閃蒸干燥機中，所有的處理是根據(jù)在一個的線性空氣流和不可避免的短的停留時間。傳熱是有限的利用直線流，給定產(chǎn)品的顆粒之間的相對速度和輸送熱空氣。作為一種替代方法，Renneburg閃存干燥器開發(fā)的切向空氣流。此設(shè)計，大大提高的保留時間和傳熱。

產(chǎn)品輸送Renneburg閃蒸干燥機內(nèi)，誘導(dǎo)由空氣流動 - 打算在直接接觸的產(chǎn)品盡可能低的機械零件的數(shù)目保持在一個重要的設(shè)計概念。其結(jié)果是，即使在處理腐蝕性和/或研磨材料的植物Renneburg維護是比較低的。為了進一步加強這方面的問題，所有Renneburg閃蒸干燥機內(nèi)置的可視化監(jiān)控功能，并提供方便的物理訪問內(nèi)飾清潔。

雖然兩個Renneburg閃蒸干燥機利用選擇性的原則運作，各機都有自己的獨特的優(yōu)勢。 Rotacurrent可以處理非粘性的產(chǎn)品，而不包混合。另一方面，Venturijet具有其自己的內(nèi)部回收系統(tǒng)和，減少旋風和互補集塵設(shè)備的大小。

Residence Time Makes All the Difference for Flash Dryers

Central to all drying and cooling processing is the concept of "residence time." Process engineers define this as the amount of processing time necessary for a given product with a specified moisture content, particle size, physical structure and temperature to reach a desired final state of dryness. In conventional or "straight-tube" flash dryers, determining the residence time is a calculation involving the length of the tube, the makeup of the material to be processed and the air velocity which moves the material from feed to discharge.

Heyl & Patterson has a Renneburg Division alternative to this traditional approach to dryer/cooler technology, offering variable residence time in a shorter tube, since geometrical height is not tied to retention time. In the Renneburg Flash Dryer, the residence time is adjusted by the spiroidal path of the particles. Operators can increase residence time by as much as a factor of five, depending on specific product requirements.

The residence time in conventional straight-tube flash dryers is approximately the same for all products, regardless of individual physical properties. Finer particles, when exposed to high inlet gas temperatures can be degraded or toasted. In some cases, heat-sensitive products can catch fire or cause explosions.

In contrast, the Renneburg Rotacurrent and Venturijet Flash Dryers ensure a selective residence time proportionate to each product's particle size and weight, represented by the length of the corresponding spiraloid particle trajectory.

This designed-in "selectivity" means homogeneous final moisture content and a high quality commercial product, without physical or chemical degradation -- unmatched in the processing industry.

Inside the straight-tube flash dryer, all processing is based on a linear air flow and the unavoidable short residence time. Heat transfer is limited utilizing linear flow, given the relative velocity between the product particle and the conveying hot air. As an alternative, Renneburg Flash Dryers develop tangential air flow. This design greatly improves the retention time and heat transfer.

Within Renneburg Flash Dryers, product conveying is induced by air movement -- an important design concept intended to keep the number of mechanical parts in direct contact with the product as low as possible. As a consequence, Renneburg maintenance even in plants which process corrosive and/or abrasive materials is relatively low. To further enhance this aspect, all Renneburg Flash Dryers have built-in visual monitoring capabilities and provide easy physical access to interiors to clean out.

While both Renneburg Flash Dryers operate utilizing the selective principle, each dryer has its own particular advantages. The Rotacurrent can handle non-sticky products without pack-mixing. On the other hand, the Venturijet has its own internal recycle system and reduces the size of cyclones and complementary dust collection equipment.