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DE-102019003467-B4 - drying device

DE102019003467B4DE 102019003467 B4DE102019003467 B4DE 102019003467B4DE-102019003467-B4

Abstract

Drying device for drying material (2) in the form of agricultural products, in particular for agricultural medicinal herbs or grains, comprising a housing (3) enclosing a drying chamber (4) with drying material (2) arranged therein and comprising at least one blower (5) for conveying drying air (T) to the drying material (2), wherein the drying air (T) is guided via at least one flow channel (6) to one side (7) of the drying material (2), and wherein the geometry of the flow channel (6) is designed such that it exerts a rectifying function on the drying air (T) and in that in the flow channel (6) a deflection of the drying air (T) in a deflection area (8) from a first section (9) to a second section (12) by more than 90° towards the drying material (2) is provided, characterized in that flow guide elements (11) are provided in the first section and in the deflection area (8) to reduce the are arranged according to the degree of turbulence (T U ) of the drying air.

Inventors

  • Albert Esper
  • Matthias Bubser

Assignees

  • INNOTECH INGENIEURSGESELLSCHAFT MBH

Dates

Publication Date
20260513
Application Date
20190513

Claims (14)

  1. Drying device for drying material (2) in the form of agricultural products, in particular for agricultural medicinal herbs or grains, comprising a housing (3) enclosing a drying chamber (4) with drying material (2) arranged therein and comprising at least one blower (5) for conveying drying air (T) to the drying material (2), wherein the drying air (T) is guided via at least one flow channel (6) to one side (7) of the drying material (2), and wherein the geometry of the flow channel (6) is designed such that it exerts a rectifying function on the drying air (T) and in that in the flow channel (6) a deflection of the drying air (T) in a deflection area (8) from a first section (9) to a second section (12) by more than 90° towards the drying material (2) is provided, characterized in that flow guide elements (11) are provided in the first section and in the deflection area (8) to reduce the are arranged according to the degree of turbulence (T U ) of the drying air.
  2. Drying device after Claim 1 , characterized in that the rectifier function is represented at least by a conically tapered first section (9) of the flow channel (6) extending from the blower (5).
  3. Drying device after Claim 2 , characterized in that the first section (9) of the flow channel (6) has a flow channel narrowing to about half the clear width (l 9 ) that the first section (9) has at the blower (5).
  4. Drying device according to one of the Claims 1 until 3 , characterized in that a clear width (l 8 ) of the deflection area (8) increases or decreases from the tapered end (10) of the first section (9) towards the material to be dried (2).
  5. Drying device according to one of the Claims 1 until 4 , characterized in that the first section (9) and the second section (12) are formed of approximately the same length, and that the second section (12) connects to the deflection area (8) and is formed with one of its sides (13) open towards the material to be dried (2).
  6. Drying device according to one of the Claims 1 until 5 , characterized in that the clear width (l 12 ) of the second section (12) decreases from the deflection area (8) to the end (13) located away from the deflection area (8).
  7. Drying device according to one of the Claims 1 until 6 , characterized in that the first section (9) and the second section (12) taper continuously in a conical shape.
  8. Drying device according to one of the Claims 1 until 7 , characterized in that the deflection area (8) is formed in the manner of an arc segment (14) with approximately 180° arc length and that a guide plate (15) is arranged in the deflection area (8) at approximately the center of the flow (16), which performs a rectifying function on the drying air (T) flowing through it.
  9. Drying device according to one of the Claims 1 until 8 , characterized in that the first section (9) and the second section (12) are longer than the drying chamber (4) for receiving the dry goods (2).
  10. Drying device according to one of the Claims 1 until 9 , characterized in that the flow channel (6) has a rectangular or square cross-sectional shape in at least one length region (17).
  11. Drying device according to one of the Claims 1 until 10 , characterized in that the drying device (1) is formed in the form of a continuous dryer (18) in which the material to be dried (2) is fed continuously, quasi-continuously or intermittently to the drying chamber (4) at one of its sides (19) and discharged at another side (20).
  12. Drying device after Claim 11 , characterized in that the material to be dried (2) in the continuous dryer (18) is permeated and/or overflowed by drying air (T).
  13. Drying device according to one of the Claims 1 until 12 , characterized in that at least one device (21) for controlling an exhaust air and/or supply air volume flow to/from the environment of the drying device (1) is assigned to the drying room (4).
  14. Drying device according to one of the Claims 1 until 13 , characterized in that the drying device (1) is designed to be operable in a recirculating air operation.

Description

The invention relates to a drying device for drying material in the form of agricultural products, in particular for agricultural products, especially for agricultural bulk goods such as medicinal herbs or grains, with a housing that encloses a drying chamber with drying material arranged therein and with at least one blower for conveying drying air to the drying material, wherein the drying air is guided to one side of the drying material via at least one flow channel, according to the preamble of claim 1. The drying of agricultural products, such as medicinal herbs or other bulk goods like corn or other grains, horticultural harvests such as tomatoes, apples, or other vegetables and fruits, or even medicinal, aromatic, and spice plants or parts thereof, enables the storage stability of the dried goods while simultaneously preserving product quality for a sufficient period. Such agricultural goods and harvested products have a natural initial moisture content after harvest of approximately 35% of their weight or more, while for stable storage, their moisture content should be between 14% and 15%. In drying devices of this type, air is drawn in from the surrounding area by a fan and passed through a heat exchanger, which is powered by solar energy or a gas or oil burner, and heated. The warm air is then passed over or through the goods being dried. In this process, the goods heat up and release their moisture to the passing warm air. The drying air absorbs moisture and cools down before either escaping from the drying room or being conveyed back into the flow channel by the blower. The DE 20 2018 003 400 U1 describes a batch dryer for agricultural products, with a housing that encloses a drying chamber with the material to be dried arranged therein and with at least one blower for conveying drying air to the material to be dried, wherein the drying air is guided to one side of the material to be dried via at least one flow channel, and wherein the geometry of the flow channel is designed such that it exerts a rectifying function on the drying air and wherein in the flow channel a deflection of the drying air in a deflection area from a first section to a second section by more than 90° towards the material to be dried is provided. The DE 10 2009 007 789 B3 This describes a drying device for agricultural products, particularly grains, with a tall silo-shaped housing that encloses a drying chamber containing a column of material stacked within it. A warm air supply is provided to deliver warm drying air to and through the material along the entire height of the drying column. An exhaust air outlet is also provided along the drying column to remove water-laden air. However, the flow channels intended for guiding the drying air and exhaust air are not suitable for ensuring low-loss transport of the drying air due to their geometric characteristics. Instead, the flow channels cause turbulence in the drying air and even backflow, resulting in a large, unoptimized blower design with unfavorably high connection values. This is exemplified by many known drying devices according to the state of the art. Based on this prior art, the invention therefore aims to create a drying device for drying material in the form of agricultural products, whose energy requirements are minimized and which enables the shortest possible drying time for the drying material with a uniform drying process. The problem is solved with a drying device having all the features of claim 1. By incorporating flow-guiding elements in the first section and the deflection area to reduce the turbulence of the drying air, design measures are implemented that enable a largely laminar flow, or at least a low-turbulence flow of the drying air in the flow channel. This results in, firstly, a very uniform application of drying air to the material being dried, and secondly, minimizes the energy consumption of the drying device. Consequently, the material being dried dries evenly and quickly. Preferred embodiments are set forth in the dependent claims. It can be advantageous to effect the rectifying function of the flow channel geometry on the drying air by using a conically tapered, preferably strongly tapered, section of the flow channel to reduce turbulence in the drying air. to reduce air. This is a measure that is particularly easy to implement from a structural perspective. It has surprisingly turned out that the narrowing of the flow channel should be advantageously designed in such a way that the clear width of the flow channel in the section from the blower to the deflection area is reduced by about half, thus providing for a reduction in the cross-sectional area of the flow channel to about 1/4 to 1/2. In the deflection zone of the flow channel, its internal diameter can either increase or decrease towards the material being dried, creating a diffuser-like effect. An increase in internal diameter in the deflection zone can occur particularly when flo