Search

BR-102024017557-A2 - HEATED AIR DIFFUSION SYSTEM

BR102024017557A2BR 102024017557 A2BR102024017557 A2BR 102024017557A2BR-102024017557-A2

Abstract

The present invention relates to a heated air diffusion system comprising four perforated propellers, in the form of a mechanical fan, which is fitted to the inlet of a rotating drying chamber of a horizontal rotary gas dryer. The heated air blown into the perforated diffuser, which, upon rotation, inserts the air in a distributed and homogeneous manner into the drying chamber to encounter the product, in this case grains, and carry out the drying process. The utilization of drying air is greater with the application of this system, resulting in faster, more homogeneous drying with lower energy consumption. The drying and heating systems are controlled by sensors, and a programmable controller was used to control the drying system.

Inventors

  • PAULO CARTERI CORADI
  • PAULO EDUARDO TEODORO
  • DALMO PAIM DE OLIVEIRA
  • ROSANA SANTOS DE MORAES
  • NAIRIANE DOS SANTOS BILHALVA

Assignees

  • UNIVERSIDADE FEDERAL DE MATO GROSSO DO SUL
  • UNIVERSIDADE FEDERAL DE SANTA MARIA

Dates

Publication Date
20260310
Application Date
20240827

Claims (5)

  1. 1. HEATED AIR DIFFUSION SYSTEM (10), wherein the system (10) is preferably used in rotary dryers comprising a cylindrical and rotating drying chamber (3) with an air flow and temperature meter (2), a gas burner (4), a flame generator (5) for heating the air, an air fan (6) and a drying chamber (8), characterized in that the system (10) comprises: - a heated air distribution and movement diffuser (1); and - an electric motor (7) for moving the diffuser (1), wherein the diffuser (1) is fixed at the entrance of the chamber (3), and this diffuser (1) directs the airflow to the bottom of the drying chamber (3).
  2. 2. HEATED AIR DIFFUSION SYSTEM (10), according to claim 1, characterized in that the diffuser (1) comprises a mechanical fan (100) with at least four perforated propellers (101) that conform to a similar star shape.
  3. 3. HEATED AIR DIFFUSION SYSTEM (10), according to claims 1 and 2, characterized in that the propeller perforations (100) comprise hollow circular holes of 1.0 mm diameter, and are constructed of sheet metal, wherein the propellers (101) are fixed to a shaft (102).
  4. 4. HEATED AIR DIFFUSION SYSTEM (10), according to any of the preceding claims, characterized in that the diffuser (1) comprises a diameter of 100 cm, and the propellers (101) comprise a diameter of 70 cm, wherein the central shaft (102) comprises a radius of 5 cm and a length of 30 cm.
  5. 5. HEATED AIR DIFFUSION SYSTEM (10), according to any of the preceding claims, characterized in that the air blown through the air blower (6), and heated by the flame generator (5), reaches the perforated propellers (101), which, when rotating, insert the air in a distributed and homogeneous manner into the interior of the drying chamber (3) and, thereby, performs the drying of the grains.

Description

FIELD OF APPLICATION [0001] The present invention is part of the field of application relating to implements for drying grains or seeds. More specifically, the present invention relates to a heated air diffusion system comprising four perforated propellers, in the form of a mechanical fan, which is fitted to the inlet of a rotating drying chamber of a horizontal rotary gas dryer. The blown and heated air reaches the perforated diffuser which, as it rotates, inserts the air in a distributed and homogeneous manner into the drying chamber, to encounter the product, in this case grains, and carry out the drying process. The utilization of drying air is greater with the application of this system, resulting in faster, more homogeneous drying with lower energy consumption. The drying and heating systems are controlled by sensors, and a programmable controller was used to control the drying system. DESCRIPTION OF THE STATE OF THE ART [0002] Coffee beans, to be consumed in the usual way as a beverage, need to be roasted and ground, and then the resulting powder filtered. A common way to dry coffee beans is through rotary dryers, agricultural implements designed for drying beans using a furnace that heats a rotating drying chamber, in which air passes from bottom to top and drying occurs through the alternation between masses of hot and cold air inside a box where the coffee beans are kept. [0003] The state of the art includes several examples of dryers with drying chambers, and many solutions feature a drying diffuser with an airflow, and chambers with various perforations, usually at the base of the drying chamber, to improve this airflow, with the aim of making the drying of the granules more uniform. An example is revealed by document US2003154624 (ownership: SEARS CHARLES F), which presents a drying method for material processing and a horizontal rotary dryer, allowing better mass processing performance of the processing material and allowing size reduction, improving the drying performance of the dryer. A drying hopper for plastic resin pellets has an inverted frusto-conical lower section and a diffuser with an inverted frusto-conical lower section and an inverted vertical frusto-conical upper section. A supply conduit is connected to the upper section and to a source of heated drying air. An inverted frusto-conical basket is arranged in the hopper at a spaced ratio with the lower portion of the diffuser and at a spaced ratio with the lower portion of the hopper. The basket is perforated so that a flow of heated drying air occurs through an annular frusto-conical passage for drying the pellets. The outward airflow through the lower end portion of the diffuser passes substantially continuously through the pellets and through the passage for highly efficient final drying of the pellets and thence to a space outside the basket and upwards for initial drying of the pellets in the hopper above. [0004] Another example is revealed by document US10132565 (ownership: GLATT INGTECH GMBH), which refers to a star-shaped rotary dryer (1) for segmenting a fluidization chamber (4) into process compartments (11), wherein the star-shaped rotary dryer (1) is pivot-mounted and has a dividing wall (9) or similar. for transporting solid particles along a transport path, where a flow receiving base (10) is detachably mounted below the star-shaped rotary dryer (1); the invention also refers to a method of spray coating solid particles for the purpose of agglomeration, coating, stratification, spray granulation or pelletizing, wherein the retention time spectrum of the solid particles inside the fluidized bed apparatus (2) has a margin of at least 1:3. [0005] However, state-of-the-art solutions do not offer air diffusers that are sufficiently distinct from those already common, and furthermore, these solutions do not take advantage of air movement for homogeneous distribution, particularly through a fan-shaped system in a rotating drum drying chamber. [0006] Considering the above, the state of the art would clearly benefit from the introduction of an air diffusion system that enables more uniform, homogeneous drying, with greater energy efficiency and lower energy consumption by the dryer and higher product quality during drying, and which can achieve a reduction in the heat transfer coefficient, resulting in an increase in temperature and a higher air velocity in the heat generator. OBJECTIVES OF THE INVENTION [0007] In order to solve the problems of the state of the art, it is an objective of the present invention to present an air diffuser system for a rotary dryer, which enables more uniform, homogeneous drying, with greater energy efficiency, lower energy consumption by the dryer and higher quality of the product in the drying process. [0008] Another objective of the present invention is to provide an air diffuser system that achieves a reduction in the heat transfer coefficient, which results in an increase in temperature and a