JPH06103147B2 - Indirect heating type fluid dryer - Google Patents

Description

TECHNICAL FIELD The present invention relates to an indirect heating type fluid drying apparatus for liquid, slurry and viscous materials.

[Prior Art] The present inventors previously proposed a conduction heat-receiving type stirring drying device described in JP-A-58-72868 as a drying device for various powders containing water (Fig. 7- (See FIG. 8).

In this example, a hollow rotary shaft 13 having a hollow coil-shaped heat transfer stirring member 14 for circulating a heat medium therein is rotatably provided in a flow chamber 4 of a dryer main body 1, and the hollow rotary shaft 13 is stirred together with the hollow rotary shaft 13. The material to be dried, which is driven by the driving device of the member 14 and forms the fluidized bed by the gas (hot air) from the perforated plate through the wind box 3, is dried while imparting heat conduction and stirring and crushing action.

In this case, there is an advantage that effective drying is performed when the water content of the material is not so large.

[Problems to be Solved by the Invention] However, by the first-stage conduction heat-receiving type stirring and drying device
When attempting to dry a liquid / slurry / viscous material (hereinafter referred to as a liquid material) which is a raw material to be dried, aggregates are generated in the fluid chamber. Such agglomerates are not fluidized by the gas blown out from the perforated plate, and eventually remain on the perforated plate without undergoing a sufficient crushing action, which hinders the formation of a fluidized bed and causes drying. There is a problem that the effect becomes worse.

The present invention solves the problems of the conventional devices as described above.
An object of the present invention is to provide an indirect heating type fluidized drying device which can move agglomerates smoothly on a perforated plate and provide a crushing mechanism to crush reliably to obtain a remarkable drying effect.

[Means for Solving the Problems] In order to achieve the above object, in the indirect heating type fluid drying apparatus of the present invention, the perforated plate is divided into a front portion, an intermediate portion and a rear portion, and the air outlets of the respective portions are front. The part is oriented in the flow direction of the material, the intermediate part is oriented in a direction perpendicular to the flow direction of the material, and the rear part is directed in the direction opposite to the flow direction of the front part, and the side wall of the flow chamber faces the outlet of the intermediate part. The side chambers were connected to each other, and a rotary vane type crusher was provided in the side chambers.

[Operation] The liquid material supplied into the fluidized bed is fluidized by blowing gas (hot air) from the perforated plate.

On the other hand, the agglomerates generated in the fluidization chamber are not fluidized and remain on the perforated plate. The agglomerates are first sent to the downstream side by the gas (hot air) from the front blowout port and perforated. Come to the middle of the board. Here, the agglomerate is sent to the side by the gas (hot air) from the air outlet of the middle part and enters the side chamber.

The agglomerates that have entered the side chamber are crushed by a rotary blade crusher into fine particles.

The fine particles are floated by the rotation of the disintegrator and the gas flow from the blowout port of the intermediate portion and enter the flow chamber to be fluidized.

Further, the agglomerates that have passed through the intermediate portion are subjected to a reverse feed (to the upstream side) action by the gas (hot air) from the rear outlet and are returned to the intermediate portion.

In this way, the agglomerates move smoothly without any stagnation on the perforated plate and are reliably crushed.

[Examples] Hereinafter, details of the present invention will be described based on Examples shown in the accompanying drawings.

In FIGS. 1 to 6, reference numeral 1 denotes a main body of a drying apparatus, in which a flat porous plate (gas dispersion plate) 2 is provided, a lower part thereof serves as a wind box 3, and an upper part thereof serves as a flow chamber. A liquid material supply nozzle 5 is provided on the upper front side of the main body 1, a discharge chute 7 is connected to a rear side wall 6, and a discharge port 8 is provided below the discharge chute 7.

The porous plate 2 is composed of three parts, a front part 2a on the supply nozzle 5 side, an intermediate part 2b and a rear part 2c on the discharge side, and each part changes the direction of the gas (hot air) outlet 9. That is, the front portion 2a faces the discharge chute 7 side (arrow a), the middle portion faces the lateral direction (arrow b), and the rear portion faces the supply nozzle 5 side (arrow c).

The gas outlet 9 is formed by punching as shown in FIG.

The wind box 3 is divided by a partition wall 3a so as to correspond to the front part 2a, the middle part 2b and the rear part 2c of the perforated plate, and a hot air introduction port 10 is provided for each of the divisions so that the hot air of a predetermined temperature is supplied to the inside of the wind box 3. And an exhaust port 11 is provided in the upper portion of the main body 1.

Reference numeral 12 is a dry material supply pipe.

Reference numeral 13 denotes two hollow rotary shafts arranged in parallel on the perforated plate 2 of the flow chamber 4, both ends of which are rotatably supported by bearings provided on the main body 1.

A heat transfer stirring member 14 is provided on the outer side of the hollow rotary shaft 13. The member 14 is formed by winding a pipe into a coil, and both ends of the member 14 communicate with the inside of the hollow rotary shaft 13.

Further, the hollow rotary shaft 13 is divided into a supply passage 13a and a discharge passage 13b by a partition plate 15 as shown in FIG. 3, the front end of the supply passage 13a is closed, and a rotary joint 16 is connected to the end of the discharge passage 13b. . The rotary joint 16 has two circumferential grooves 17, 18 inside,
The circumferential groove 17 and the supply passage 13a are communicated with each other via a conduit 19, and the circumferential groove 18
And the discharge path 13b.

Reference numerals 20 and 21 denote supply pipes and discharge pipes connected to the circumferential grooves 17 and 18, respectively. However, the structure of the joint 16 is an example, and various other types can be used.

Reference numeral 22 denotes a side chamber provided on one side wall (front wall) of the main body 1 so as to communicate with the flow chamber 4, and the side chamber is located at the intermediate portion 2b of the porous plate 2.

Reference numeral 23 denotes a rotary vane type crusher provided in the side chamber 22. A rotary shaft 24 is provided from the outside of the side chamber 22 through the side chamber 22 in a direction perpendicular to the side wall of the main body 1, and the rotary shaft 24 in the side chamber 22 is crushed. With blades 25
A motor 26 is provided on a rotary shaft 24 outside the side chamber 22. This crushing blade
A large number of flat plate members 25 are erected on the rotary shaft 24 at appropriate angles. By rotating the crushing blades 25 thus formed, crushing of agglomerates, feeding action of crushed fine particles into the fluid chamber, and further generation of airflow to the fluid chamber side are generated.

27 is a gear fixed to the hollow rotary shaft 13, and both gears are directly meshed.

Reference numeral 28 denotes a chain wheel fixed to the hollow rotary shaft 13 and is driven by a drive device (not shown) including a motor and a speed reducer.

29 is a discharge port, and the discharge pipe 30 is connected to this discharge port. This is to remove the material in the flow chamber 4 after the operation is stopped.

Next, the operation of the above embodiment will be described.

First, in the initial stage of operation, from the dry material inlet 12 to the flow chamber 4
Put the dry material (product) inside, and each hot air inlet
When hot air is introduced into the wind box 3 from 10, it is blown up into the fluid chamber 4 from the respective outlets 9 of the perforated plate 2, whereby the dry raw material becomes a floating body to form a fluidized bed in advance.

Then, from this state, the liquid material is continuously charged from the supply nozzle 5 into the flow chamber 4, so that the liquid material flows while adhering to the dry material.

Further, during this time, the rotating shaft 13 rotates and a heat medium such as hot water or steam is supplied to the supply pipe 20 → the peripheral groove 17 → the conduit 19 → the supply passage 13a.
→ Heat transfer member 14 → Discharge path 13b → Circumferential groove 18 → Discharge pipe 21 flows to heat the member 14, heat transfer from the heated member 14 to the liquid material of the fluidized bed and heat from the hot air to the material. Movement and parts 14
Due to the synergistic effect of the stirring action by the mixing of the materials and partial crushing, the drying effect is enhanced.

In this way, the material is gradually moved and discharged from the discharge chute 7 → the discharge port 8 while repeatedly stirring in the flow chamber 4, and the exhaust gas is discharged from the exhaust port 11.

The heat transfer member 14 is embedded in the fluidized bed, and the amount of gas blown out from the perforated plate 2 is adjusted so that the upper surface thereof is slightly above. However, a part of the liquid material adheres to the dry material and coagulates and enlarges into a coagulated mass.

In this way, the agglomerates are not easily fluidized by the gas blown out from the perforated plate 2, but stay on the perforated plate 2. This agglomerate moves to the outlet 8 side by the gas from the air outlet 9 of the front part 2a, and when it reaches the intermediate part 2b of the porous plate 2, the agglomerate is caused by the gas from the air outlet 9 of the intermediate part 2b. Move to side chamber 22 and enter side chamber 22.

The agglomerates that have entered the side chamber 22 are finely crushed by the rotation of the crushing blades 25 of the crusher 23. The crushed fine particles are floated by the gas flow from the blowout port 9 and the rotation action of the crushing blades 25, and are recirculated into the flow chamber 4 and fluidized. At this time, as shown in FIG. 2, the rotating shaft 13 is rotated in the direction of the arrow with respect to the mounting angle of the crushing blades 25, so that the crushed fine particles are smoothly recirculated.

The agglomerates that have passed through the intermediate portion 2b of the porous plate 2 and flowed onto the rear portion 2c are fed back to the intermediate portion 2b by the gas (hot air) from the gas outlet 9 facing the intermediate portion 2b. The crushing action of the crushing blades 25 is again passed through the intermediate portion 2b of the porous plate 2.

Such agglomerates move smoothly on the perforated plate 2 without stopping, and are reliably crushed.

In addition, although two rotary shafts are provided in the above embodiment, a single shaft type may be used.

[Effects of the Invention] Since the present invention has the above-described configuration, it has the following effects.

The perforated plate is divided into a front part, an intermediate part and a rear part, and the outlets of the parts are arranged such that the front part is in the material flow direction, the middle part is in the direction perpendicular to the material flow direction and the rear part is in the direction opposite to the front part flow direction. Since it is directed, the agglomerates move smoothly under the fluidized bed, that is, immediately above the perforated plate, and there is no congestion. Therefore, a chattering phenomenon (air is blown through a part of the perforated plate) and a slacking phenomenon (materials are not evenly dispersed because air does not uniformly pass through each material) are formed. Uniform drying due to formation is possible.

In addition, a side chamber is provided on the side wall of the flow chamber so as to face the air outlet in the middle part of the perforated plate, and a rotary vane type crusher is provided in this side chamber. The gas from the air outlet enters the side chamber while moving toward the side wall of the flow chamber, and is reliably crushed into fine particles by the crushing blades rotating there.

Therefore, a stable fluidized state is formed without hindering the fluidized bed formation of the liquid material due to the aggregates staying on the perforated plate, and the particle size distribution of the product thus obtained becomes uniform.

Furthermore, since a uniform temperature distribution of the material is secured, the amount of hot air required for drying, the fluidizing air velocity, and the pressure loss can be reduced, and the energy consumption can be greatly reduced.

[Brief description of drawings]

1 is a vertical plan view showing an embodiment of the present invention, FIG. 2 is a partially enlarged sectional view taken along the line I-I of FIG. 1, and FIG. 3 is a partially cutaway enlarged vertical side view of a heat transfer member, FIG. 4 is an enlarged plan view of the perforated plate, FIG. 5 is an enlarged plan view of the perforated plate outlet, FIG. 6 is an enlarged vertical sectional view of the perforated plate outlet, and FIG. 7 is a longitudinal front view showing a conventional example. FIG. 8 is a vertical sectional side view showing a conventional example. 1 ... Main body, 2 ... Perforated plate, 3 ... Wind box 4 ... Flow chamber, 13 ... Hollow rotating shaft 14 ... Heat transfer member, 16 ... Rotary joint 22 ... Side chamber, 23 ... Rotating blade Mold crusher 24 …… Crushing blade

Claims (1)

[Claims] 1. A dryer main body having a material supply port at one end and a dry product discharge port at the other end is divided into a flow chamber on the upper side and a wind box on the lower side by a perforated plate provided inside, and the flow chamber is provided in the flow chamber. A hollow rotary shaft having a hollow coil-shaped heat transfer fluid member that circulates a heat medium inside is rotatably arranged, and an indirect heating type fluid drying device in which a drive device is connected to the hollow rotary shaft is used. The front part, the middle part and the rear part are divided, and the air outlets of the respective parts are oriented such that the front part is in the flow direction of the material, the middle part is in the direction orthogonal to the flow direction of the material, and the rear part is in the direction opposite to the flow direction of the front part. An indirect heating type fluidization drying device characterized in that a side chamber is connected to a side wall of the flow chamber so as to face the air outlet of the intermediate portion, and a rotary vane type crusher is provided in the side chamber.