CN104132523B - A kind of flash dryer - Google Patents

Abstract

The invention discloses a flash drying machine, which comprises a transmission mechanism and a material breaking mechanism. The material breaking mechanism includes a hollow outer rotating shaft and an inner rotating shaft arranged in the hollow outer rotating shaft; it also includes drying cylinders sequentially connected from top to bottom , sieve plate section cylinder, and air inlet cylinder; the transmission mechanism includes an inner shaft drive mechanism and a hollow outer shaft drive mechanism; the lower section of the drying cylinder is equipped with an upper blade and a lower blade for breaking up materials; the upper blade is connected to the inner shaft, and the inner The rotating shaft is connected with the inner rotating shaft driving mechanism through the inner rotating shaft pulley; the lower blade is connected with the hollow outer rotating shaft, and the hollow outer rotating shaft is connected with the hollow outer rotating shaft driving mechanism through the hollow outer rotating shaft pulley. The combined shaft system of the hollow outer shaft and the inner shaft realizes the opposite high-speed rotation of the upper and lower blades, which can make the lumpy or pasty materials reciprocate and hit between the upper and lower blades at high speed, and has the ability to disperse more thoroughly. , the wet material particles are finer, and the energy saving effect is remarkable.

Description

A flash dryer

technical field

The invention relates to airflow drying equipment and energy saving thereof, in particular to a flash drying machine.

Background technique

Flash dryer is a large-scale drying equipment integrating drying technology and fluidization technology. Compared with other drying equipment, it has the advantages of continuous operation, compact structure, convenient operation, less failure and low maintenance cost. Existing flash dryers generally include a flash drying chamber, a dispersing device, a transmission device, an air inlet, a feed inlet, a classifier, and a discharge outlet. The hot air enters the drying chamber from the annular gap at the bottom of the drying cylinder. The materials are broken up by the dispersing device and fully contact with the hot air to complete the heat transfer and mass transfer process. The hot air carrying the materials leaves the drying chamber after being filtered by the classifier and enters the bag Separation equipment such as type dust collector for gas-solid separation, so as to obtain dry materials.

At present, there are still many problems in flash drying equipment, and the drying effect is not ideal when drying filter cake-like and viscous materials. The existing dispersing blades have a single structure and a fixed rotation mode, resulting in inconspicuous dispersing effect and coarse wet material particles, prolonging the drying time of wet materials. In addition, there is an inverted cone structure at the bottom of the drying cylinder, although it can produce effective Rotating airflow, but the narrow annular gap has great resistance to airflow. Therefore, the energy consumption of flash drying is high.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings and deficiencies of the above-mentioned prior art, and provide a flash dryer, which can effectively solve the problem of breaking up filter cake and paste materials, effectively solve the problem of large airflow resistance, and achieve the purpose of energy saving .

The present invention realizes through following technical scheme:

A flash dryer, comprising a transmission mechanism and a material breaking mechanism, the material breaking mechanism includes a hollow outer rotating shaft 19 and an inner rotating shaft 23 arranged in the hollow outer rotating shaft 19; it also includes a drying cylinder 9 sequentially connected from top to bottom , sieve plate section tube 7, air inlet tube 5; the transmission mechanism includes an inner shaft drive mechanism and a hollow outer shaft drive mechanism;

The lower section of the drying cylinder 9 is equipped with an upper blade 8 and a lower blade 15 for breaking up materials;

The upper blade 8 is connected to the inner shaft 23, and the inner shaft 23 is connected to the inner shaft driving mechanism through the inner shaft pulley 24; the lower blade 15 is connected to the hollow outer shaft 19, and the hollow outer shaft 19 is connected to the hollow outer shaft driving mechanism through the hollow outer shaft pulley 21. connect.

The bottom scraper blade 16 is arranged inside the sieve section cylinder 7, and the bottom scraper blade 16 is installed on the hollow outer rotating shaft 19; the lower end of the sieve section cylinder 7 is provided with a porous sieve plate 6.

The upper blade 8 and the lower blade 15 are respectively composed of left and right blades installed obliquely in the shape of a "one";

The direction of rotation of the blades of the upper blade 8 and the lower blade 15 is opposite;

The inclined surfaces of the upper blades 8 and the lower blades 15 are opposite or the same.

The sidewall of the lower end of the drying cylinder 9 is equipped with a screw feeder 13; the inside of the upper end of the drying cylinder 9 is equipped with a filter screen 12; Mouth 11.

The side wall of the drying cylinder 9 is provided with a sight glass 10 for observing the material in the drying cylinder 9 .

The flash dryer also includes a bracket 4 for fixing the hollow outer shaft 19 and the inner shaft 23;

The hollow outer rotating shaft 19 is placed outside the inner rotating shaft 23, and the end of the inner rotating shaft 23 extends outside the hollow outer rotating shaft 19;

The hollow outer rotating shaft 19 and the inner rotating shaft 23 are installed on the support 4 through bearings respectively.

The air inlet tube 5 is provided with an air inlet 17; the bottom of the air inlet tube 5 is provided with a slag discharge hole 18.

The inner shaft 23 below the upper blade 8 is provided with an anti-leakage material end cover 14 to prevent materials from entering the hollow outer shaft 19 .

Compared with the prior art, the present invention has the following advantages and effects:

1. The combined shaft system of the hollow outer shaft and the inner shaft realizes the opposite high-speed rotation of the upper and lower blades, which can make the blocky or pasty materials reciprocate at high speed between the upper and lower blades, and disperse more thoroughly. , making the wet material particles finer, shortening the drying time, and the energy saving effect is remarkable.

2. The obliquely installed blades, combined with the high-speed motion effect of opposite directions, can effectively break up and break up lumpy or pasty materials quickly.

3. The lower end of the sieve plate section is equipped with a porous sieve plate 6, which can realize the uniform distribution of the hot air velocity field, and when the hot air flows through the small holes of the sieve plate, the speed is relatively high, which can effectively blow up the large material and scrape it from the bottom layer. The material blade is crushed several times to make the wet material particles finer.

4. The lower end of the flash dryer is equipped with a porous sieve plate 6 structure, which makes the air flow resistance smaller and the energy saving effect is obvious.

5. The technical means of the flash drying machine is practical and feasible, and the effect of dispersing, crushing and energy saving is obviously better than that of the prior art.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

detailed description

The present invention will be described in further detail below in conjunction with specific embodiments.

Example

As shown in Figure 1. The flash dryer of the present invention includes a transmission mechanism and a material breaking mechanism, and the material breaking mechanism includes a hollow outer rotating shaft 19 and an inner rotating shaft 23 arranged in the hollow outer rotating shaft 19; it also includes a drying cylinder 9 sequentially connected from top to bottom , sieve plate section tube 7, air inlet tube 5; the transmission mechanism includes an inner shaft drive mechanism and a hollow outer shaft drive mechanism;

The lower section of the drying cylinder 9 is equipped with an upper blade 8 and a lower blade 15 for breaking up materials;

The upper blade 8 is connected to the inner shaft 23, and the inner shaft 23 is connected to the inner shaft driving mechanism through the inner shaft pulley 24; the lower blade 15 is connected to the hollow outer shaft 19, and the hollow outer shaft 19 is connected to the hollow outer shaft driving mechanism through the hollow outer shaft pulley 21. connect.

The bottom scraper blade 16 is arranged inside the sieve section cylinder 7, and the bottom scraper blade 16 is installed on the hollow outer rotating shaft 19; the lower end of the sieve section cylinder 7 is provided with a porous sieve plate 6.

The upper blade 8 and the lower blade 15 are respectively composed of left and right blades installed obliquely in the shape of a "one";

The direction of rotation of the blades of the upper blade 8 and the lower blade 15 is opposite;

The inclined surfaces of the upper blades 8 and the lower blades 15 are opposite or the same.

The sidewall of the lower end of the drying cylinder 9 is equipped with a screw feeder 13; the inside of the upper end of the drying cylinder 9 is equipped with a filter screen 12; Mouth 11.

The side wall of the drying cylinder 9 is provided with a sight glass 10 for observing the material in the drying cylinder 9 .

The flash dryer also includes a bracket 4 for fixing the hollow outer shaft 19 and the inner shaft 23;

The hollow outer rotating shaft 19 is placed outside the inner rotating shaft 23, and the end of the inner rotating shaft 23 extends outside the hollow outer rotating shaft 19;

The hollow outer rotating shaft 19 and the inner rotating shaft 23 are installed on the support 4 through bearings respectively.

The air inlet tube 5 is provided with an air inlet 17; the bottom of the air inlet tube 5 is provided with a slag discharge hole 18.

The inner shaft 23 below the upper blade 8 is provided with an anti-leakage material end cover 14 to prevent materials from entering the hollow outer shaft 19 .

The working mechanism of the flash dryer is as follows:

The hot air enters from the air inlet 17, and after passing through the air inlet tube 5, enters the sieve plate section tube 7 from the bottom. The structure of the air inlet tube 5 is similar to a 90° elbow, which can effectively reduce resistance loss. When the hot air flows through the perforated sieve plate 6, the speed of the hot air increases rapidly because the flow section suddenly becomes a small hole. The bulk material that is not sufficiently broken up at the bottom of the section cylinder 7 is blown up and enters the breaking area again, and the bulk material is broken by the bottom scraping blade 16 for many times.

Compared with the inverted cone structure of traditional flash drying equipment, the structure of the sieve plate section can generate linear airflow evenly distributed along the radial direction instead of the traditional rotating airflow, which makes full use of the drying space, shortens the circulation path, and effectively reduces the Resistance loss, energy-saving effect is remarkable. The cake-like or paste-like material falls through the screw feeder 13 into the breaking up area formed by the high-speed rotating upper blade 8 and the lower blade 15. Since the blades are installed obliquely, the material impacted by the upper blade 8 moves obliquely downward. There is a great relative speed between the high-speed moving material and the counter-rotating lower blade 15, and the lower blade hits the material violently. Since the upper and lower blades have the same inclination direction but different rotation directions, the material hit by the lower blade 15 Immediately reverse movement, and collide with the upper blade 8, the material is completely broken up in the process of reciprocating movement.

At the same speed, the transmission mechanism of this flash dryer can make the upper and lower blades rotate in a positive and negative direction. Compared with the traditional dispersing device, it has a greater relative dispersing speed and generates a greater dispersing force. The wet material particles are dispersed after being dispersed. It becomes smaller, thereby shortening the drying time and effectively saving drying energy.

A small amount of lumpy materials that are not fully dispersed fall into the bottom of the sieve plate section cylinder 7 under the action of gravity, and then are quickly blown up by the high-speed airflow passing through the porous sieve plate 6, and the high-speed rotating bottom scraping blade 16 performs multiple Breaking up and crushing for the first time, the fine particles after crushing move upward with the hot air, and the drying process is completed quickly. At the same time, the passage (drying cylinder 9 or sieve plate section cylinder 7) is cleaned, reducing the possibility of material accumulation. Even a small amount of material residue can be discharged through the slag discharge hole 18.

After being fully dispersed, the finer material particles and the hot air evenly distributed in the velocity field are fully contacted in the drying area (drying cylinder 9), and the heat transfer and mass transfer processes are quickly realized. Compared with traditional flash evaporation equipment, the drying process of the present invention The time is significantly shortened. A large amount of material rises rapidly with the hot air, passes through the screening effect of the filter screen 12, and the material that meets the drying requirements and has a particle size lower than the screened particle size passes through the filter screen 12, is discharged through the discharge port 11, and passes through the subsequent separation device such as a bag filter. The collection of dry materials is realized, and the large particle materials in the drying cylinder are blocked back to the drying cylinder for continuous crushing and drying.

As described above, the present invention can be preferably carried out.

The implementation of the present invention is not limited by the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods, and are all included in within the protection scope of the present invention.

Claims (7)

1. A flash dryer, comprising a transmission mechanism and a material breaking-up mechanism, characterized in that: the material breaking-up mechanism includes a hollow outer shaft (19) and an inner shaft (23) located in the hollow outer shaft; The drying cylinder (9), the sieve plate section cylinder (7), and the air inlet cylinder (5) are sequentially connected from top to bottom; the transmission mechanism includes an inner rotating shaft driving mechanism and a hollow outer rotating shaft driving mechanism; The lower section of the drying cylinder (9) is equipped with an upper blade (8) and a lower blade (15) for breaking up materials; The upper blade (8) is connected to the inner shaft (23), and the inner shaft (23) is connected to the inner shaft driving mechanism through the inner shaft pulley (24); the lower blade (15) is connected to the hollow outer shaft (19), and the hollow outer shaft ( 19) Connect with the hollow outer shaft drive mechanism through the hollow outer shaft pulley (21); The upper blade (8) and the lower blade (15) are respectively composed of left and right blades installed obliquely in the shape of a "one"; The direction of rotation of the blades of the upper blade (8) and the lower blade (15) is opposite; The inclined surfaces of the upper blades (8) and the lower blades (15) are opposite or the same. 2. The flash dryer according to claim 1, characterized in that: the bottom scraper blade (16) is arranged inside the sieve section cylinder 7, and the bottom scraper blade (16) is installed on the hollow outer shaft (19 ); the lower end of the sieve plate section (7) is provided with a porous sieve plate (6). 3. The flash drying machine according to claim 2, characterized in that: the sidewall of the lower end of the drying cylinder (9) is equipped with a screw feeder (13); the upper end of the drying cylinder (9) A filter screen (12) is installed inside; a discharge port (11) is provided on the upper side wall of the filter screen (12) of the drying cylinder (9). 4. The flash dryer according to any one of claims 1 to 3, characterized in that: the side wall of the drying cylinder (9) is provided with a sight glass for observing the material in the drying cylinder (9) ( 10). 5. The flash drying machine according to claim 4, characterized in that: the flash drying machine also includes a bracket (4) for fixing the hollow outer shaft (19) and the inner shaft (23); The hollow outer rotating shaft (19) is placed outside the inner rotating shaft (23), and the end of the inner rotating shaft (23) stretches out of the hollow outer rotating shaft (19); The hollow outer rotating shaft (19) and the inner rotating shaft (23) are installed on the support (4) by bearings respectively. 6. The flash dryer according to claim 4, characterized in that: the air inlet cylinder (5) is provided with an air inlet (17); the bottom of the air inlet cylinder (5) is provided with a slag discharge hole (18). 7. The flash dryer according to claim 4, characterized in that: the inner shaft (23) below the upper blade (8) is equipped with a leak-proof material end to prevent materials from entering the hollow outer shaft (19) Cover (14).