RU2377488C1 - Convection drier - Google Patents

Abstract

FIELD: heating systems, drying.

SUBSTANCE: invention refers to drying procedure of disperse high-moisture materials and can be used in food, chemical and other industries. Convection drier includes vertical shaft of rectangular section with loading silo and unloading device, which consists of sections with inclined perforated flanges, which are isolated from each other as to drying agent and installed one above the other and comprising zigzag-shaped channel for moving dried material from loading silo to unloading device. At that, each section includes supply and discharge drying agent headers. Each flange represents a frame on which a perforated grid is fixed thus forming an opening in its lower part throughout the width for unloading dried material from the above located flange to below located one; in each section under the opening in the flange there made are openings so that dried material can be charged to upper part of below located flange; the last flange is installed in unloading device zone and made without material unloading opening; lower edge of each frame is connected to internal shaft wall with a hinge located in attachment points of sections, and upper edge of frame is brought into vibratory movement in vertical plane by means of vibratory drive installed on external side of each section; at that, flange vibration is performed relative to the hinge along guides.

EFFECT: improving dried product quality.

2 dwg

Description

The invention relates to techniques for drying dispersed high-moisture materials and can be used in food, chemical and other industries.

The closest in technical essence and the achieved effect is a convective dryer [RF Patent No. 2287751, IPC ⁷ F26B 17/12. Convective dryer / A.A.Shevtsov, A.V. Drannikov, V.V. Ivanov, No. 2005112090/06; Declared April 25, 2005; Published on November 20, 2006. Bulletin No. 32], including a vertical rectangular shaft with a loading hopper and an unloading device, consisting of sections isolated from each other by a drying agent and mounted one above the other with inclined perforated shelves forming a zigzag channel for moving the dried material from the loading hopper to the unloading device wherein each section contains inlet and outlet collectors of a drying agent.

Known convective dryer has several disadvantages:

- insufficiently high quality of the dried material;

- unevenness and trauma of particles of certain materials during drying due to the presence of overflow nozzles;

- the possibility of failure of the shelves during operation due to their complexity in design;

- large dimensions and high metal consumption of the dryer.

An object of the invention is to improve the quality of the dried product, reducing metal consumption and simplifying the design of the dryer.

The object of the invention is achieved in that in a convective dryer, including a vertical shaft of rectangular cross-section with a loading hopper and an unloading device, consisting of sections isolated from each other by a drying agent and mounted on top of each other with inclined perforated shelves forming a zigzag channel for moving the dried material from the loading hopper to the unloading device, with each section containing inlet and outlet collectors drying about the agent, it is new that each shelf is a frame on which a perforated lattice is fixed with the formation of a window in its lower part over the entire width for unloading the dried material from the upstream shelf to the downstream one, in each section under the window in the shelf there are windows thus so that the material to be dried is poured onto the upper part of the lower shelf, the last shelf is installed in the area of the unloading device and is made without a window for unloading material, the lower edge of each frame is connected nene with the inner wall of the shaft by a hinge located at the junction of the sections, and the upper edge of the frame is oscillated in the vertical plane by means of a vibrator mounted on the outside of each section, while the shelf oscillates relative to the hinge along the guides mounted on the inner side of each sections.

In Fig.1 shows a General view of a convective dryer, and in Fig.2 - shelf design.

A convective dryer contains a vertical shaft of rectangular cross section, consisting of three sections 1, 2, 3 mounted on top of each other (the number of sections depends on the type of bulk materials). Each section has a perforated inclined shelf 4, which is a frame 5, on which a perforated grating 6 is fixed with the formation of a window 9 in its lower part over the entire width. At the same time, at the junction of sections under the window in the shelf 4, windows are made in such a way that the material to be dried is poured onto the upper part of the lower shelf. The last shelf 4 is made without a window. The lower edge of each frame 5 is connected to the inner wall of the shaft by a hinge 7. The upper edge of the frame is oscillated in a vertical plane relative to the hinge along the guides 8 of the vibrodrive 10. The vibrodrive is mounted on the outside of each section and connected to the upper edge of the frame through the hole 11. To each sections from the outside are connected inlet 14 and outlet 15 collectors of the drying agent. The mine is equipped with a feed hopper 12 for supplying wet material and a discharge device 13.

Convective dryer operates as follows.

The wet material enters section 1 through the feed hopper 12 and enters the perforated inclined shelf 4, consisting of a frame 5 and a perforated grate fixed thereon 6. From below, a drying agent passes through the perforated grate of the shelf with moist dispersed material through a supply manifold 14. Size the holes of the perforated grate are selected for each material so that it does not spill out through the grate during the drying process. The spent drying agent leaves the section through the outlet manifold 15. The material moves down the perforated shelf 4 under the influence of gravity and due to vibrational movements of the shelf in the vertical plane relative to the hinge 7 along the guides 8 fixed on the inner side of each section. The hinges 7 connect the lower edge of the frame 5 with the inner wall of the shaft and are located at the junction of the sections in order to reduce the height of the dryer and, therefore, its metal consumption. The shelf is driven in vibrational motion by means of a vibrodrive 10 mounted on the outer side of each section and connected to the upper edge of the frame 5 through the hole 11. The amplitude and frequency of vibrations of the shelf 4 can vary depending on the type of material being processed and its humidity. So, if the humidity of the material is high and (or) the material is prone to clumping, then the amplitude and frequency of oscillations of the shelf increase. In addition, by changing the frequency and (or) the amplitude of oscillation of the shelf, you can adjust the time spent by the material in each section and, accordingly, in the dryer as a whole.

The dried material from the upper section 1 through the window 9 of the shelf 4 and then through the windows of the sections 1 and 2 is poured onto the upper part of the inferior perforated shelf 4 of the section 2. Successively passing through all sections of the vertical shaft through a zigzag channel formed by inclined perforated shelves, the dried material enters the last perforated shelf, which is made without a window for unloading material, and is removed from the shaft by an unloading device 13.

Thus, the proposed convection dryer, compared with the prototype, allows

- improve the quality of the finished product due to the replacement of the filling nozzles on the window for unloading material from one section to another;

- to increase the reliability of the dryer through the use of more simple in design perforated shelves;

- reduce the dimensions and metal consumption of the dryer due to a more rational layout of the components of the dryer.

Claims (1)

A convective dryer, including a vertical rectangular shaft with a loading hopper and an unloading device, consisting of sections isolated from each other by a drying agent and mounted on top of each other with inclined perforated shelves forming a zigzag channel for moving the dried material from the loading hopper to the unloading device, this each section contains inlet and outlet collectors of the drying agent, characterized in that each shelf is a frame on which the perforated grating is fixed with the formation of a window in its lower part over the entire width for unloading the dried material from the upstream shelf to the lower one, in each section under the window in the shelf there are windows so that the dried material is poured onto the upper part of the lower shelf, the last the shelf is installed in the area of the unloading device and is made without a window for unloading material, the lower edge of each frame is connected to the inner wall of the shaft by a hinge located in places with of the connections of sections, and the upper edge of the frame is driven to oscillate in a vertical plane by means of vibration drive mounted on the outer side of each section, wherein the swing hinge is relatively shelves on guides fixed to the inner side of each section.

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