JPS6343672B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot air heated groove type stirring dryer.

Groove-type agitation dryers have been used for a long time to transfer materials while stirring them inside the grooves, and dry them either by direct heating with hot air or by heat transfer heating through the walls of the grooves or the stirring shaft. . An example of a conventional hot air heating groove type stirring dryer is shown in FIGS. 1 and 2.

The dryer shown in FIGS. 1 and 2 is commercially available under the trade name Rapid Dryer. In the drawings, black arrows indicate the flow direction of the material, and open arrows indicate the flow direction of the drying gas. This dryer consists of a horizontal cylindrical drying chamber 30 having two parallel hollow cylindrical grooves 34 for accommodating a stirrer 31 having two stirring shafts 32 on the lower side. The stirring shaft 32 has a stirring blade 3 that moves the material backward while bouncing it upward.
3 is installed with a twisted angle or in an inclined configuration. The stirring shaft 32 is arranged parallel and horizontally in the front-rear direction with the stirring blades 33 close to each other.
As shown by the arrows in the figure, they are rotated in opposite directions with adjacent sides facing upward. Inside the drying chamber 30, there are a plurality of vertical partition plates 35 except for the part of the agitator 31.
The front and rear directions are separated by A hot air inlet 36 is provided on the front side of the drying chamber 30, and an exhaust port 37 is provided on the upper rear side.
A raw material (wet material) supply port 38 is provided in the upper front part, and a groove 3
Product (dried material) outlet 39 at the rear end of the 4th section
are provided for each.

The drying chamber 30 of this dryer is partitioned by a partition plate 35 and has a multi-chamber structure. The material is splashed up to the top of each chamber by the stirrer 31 and sent to the discharge port 39.
will be transported towards. The hot air passes under the partition plate 35 and flows in parallel with the material.

This dryer uses relatively high-temperature hot air (up to 900℃).
The structure is suitable for drying powder and granular materials. That is, since the hot air needs to pass several times under the partition plate 35 and between the material and the stirring blade 33 of the stirrer 31 that is transporting the material, a relatively small amount of high-temperature hot air is forcibly sent. That is appropriate.

When relatively low-temperature exhaust gas is introduced into this dryer to exhibit the same drying ability as high-temperature hot air, a large amount of exhaust gas is inevitably required. The temperature of the waste gas discharged from various furnaces is about 200 to 350℃, and if the gas temperature after use is about 100℃, it will be 3 to 7℃ when using hot gas of 800 to 900℃.
It is required to introduce twice the amount of waste gas.

If this large amount of waste gas is introduced into an existing rapid dryer, the gas velocity will be excessive, resulting in an extremely high pressure drop, the granular material will be blown away, and the lumps in the granular material will be sufficiently broken up. They tend to be discharged outside the vessel together with the gas without drying and are insufficiently dried, and the abrasion caused by the high-speed gas flow also increases. These problems result in higher running costs due to increased power energy and increased wear. On the other hand, although the relatively high running cost can be reduced by using a large-sized dryer, an increase in the cost of the dryer is unavoidable.

The purpose of the present invention is to prevent the formation of lumps even if there are lumps mixed in the powder material, to improve the drying ability by using low-temperature hot air, and to reduce the ventilation resistance of the hot air. To provide a hot air heating groove type stirring dryer which can reduce power consumption, and has low running costs and equipment costs.

The hot air heating groove type stirring dryer according to the present invention has a hollow drying chamber which has an exhaust port on the upper side, a raw material supply port on the front side, a product outlet on the rear end of the bottom plate, and a stirrer at the bottom. The agitator has two agitating shafts equipped with agitating blades that transport the material backward while bouncing the material upward, and the agitating shafts move the agitating blades close to each other in the front-rear direction. The bottom plate of the drying chamber is arranged horizontally side by side and rotated in opposite directions with the adjacent sides facing upward, and the bottom plate of the drying chamber is close to the stirring blade, and has two parallel hollow cylindrical groove-shaped hot air heating grooves. In the type stirring dryer, a hot air blowing port is provided over the entire length of both sides of the drying chamber, with the tip thereof facing the downward rotating position of the stirring blade from diagonally above and approaching the stirring blade, The inner wall plate of the hot air inlet is shared with the lower side plate of the drying chamber, and the material that is splashed up by the agitator and falls on this plate is guided to the agitator from a direction approximately perpendicular to the rotational tangent direction of the agitating blade. This dryer is characterized by having a sliding board.

Another hot air heating groove-type stirring dryer according to the present invention is one in which the two stirring shafts of the stirrer in the dryer according to the present invention described above are combined into one. Therefore, this device also has a hot air blowing port. The other configurations are the same as the above-mentioned device.

In a preferred embodiment of the dryer according to the present invention, the drying chamber is provided with one or more vertical partition plates that partition the inside of the drying chamber in the front and back direction.

In another preferred embodiment of the dryer according to the present invention, the drying chamber is provided with a baffle plate above the interior thereof to separate floating matter entrained in the hot air.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a hot air heating groove type stirring dryer according to the present invention will be described in detail based on drawings of embodiments. FIG. 3 is a longitudinal sectional view of an embodiment of the dryer of the present invention, and FIG. 4 is a sectional view taken along the - arrow in FIG.

Referring to FIGS. 3 and 4, this dryer has an exhaust port 13 on the upper side, a raw material (material to be dried) supply port 14 on the front side, and a product (dried material) outlet on the rear end of the bottom plate. It consists of a hollow drying chamber 10 having an outlet 16 and a stirrer 4 at the bottom. The hot air blowing port 6 will be described later. Black arrows indicate the flow direction of the material, and white arrows indicate the flow direction of the gas. Gas seal gates 15 and 17 such as rotary valves are provided at the raw material supply port 14 and the product output port 16, respectively.

The agitator 4 is similar in structure to the agitator in the conventional dryer shown in FIGS. 1 and 2. That is,
The stirrer 4 has two stirring shafts 1, 1, and a plurality of stirring arms 2 are attached to each stirring shaft 1, and abrasion-resistant stirring blades 3 are attached to the tips of the stirring arms 2. The stirring blades 3 are attached with a twisted angle or in an inclined shape in order to transfer the material backward while bouncing it upward. The two stirring shafts 1, 1 are arranged horizontally in the front-rear direction with the stirring blades 3 close to each other, with the adjacent sides facing upward as shown by the arrows in FIG. is rotated in the opposite direction.

The bottom plate 5 of the drying chamber 10 has two parallel hollow cylindrical grooves corresponding to the shape of the stirrer 4, and is placed close to the stirring blades 3. The space formed by the groove in the bottom plate 5 is indicated by the reference numeral 21.

A hot air inlet is installed over the entire length of both sides of the drying chamber 10, with its tip facing the downward rotating position of the stirring blade 3 (outside with respect to the stirring shaft 1) from diagonally above and close to the stirring blade. 6 is provided. Further, in the illustrated embodiment, the wall plate 7 inside the hot air inlet 6 is shared with the lower side plate of the drying chamber 10, and the wall plate 7 is pivotally attached to the upper side plate of the drying chamber 10 so as to be swingable. The wall board 7 is flipped up by the agitator 4,
A sliding plate is formed that slides the material falling due to gravity and guides it to the stirrer from a direction substantially perpendicular to the rotational tangent direction of the stirring blade. Since the wall plate, ie, the sliding plate 7, is swingable, the width of the hot air inlet 6 and the position at which the sliding material is returned to the stirrer can be adjusted. The outer wall plate of the hot air inlet 6 and the inner side of the bottom plate 5 are lined with a wear-resistant liner 8. Sliding board 7
The inside of the holder is also lined with a wear-resistant liner 9.

Hot air is blown into the downwardly rotating position of the stirring blade 3 from the hot air inlet 6, passes through the groove space 21 as the blade 3 rotates, and enters the drying chamber 1 from the center of the stirrer 4.
It is blown up within 0. On the other hand, raw materials (materials) are fed from the raw material supply port 14 to a position in the center of the stirrer 4 where the stirring blades 3 are rotating upward. The material is therefore immediately blown up by the hot air. The space required for drying the material below the cavity of the drying chamber 10 is indicated by reference numeral 11, and the space above it necessary for separating the material and gas is indicated by reference numeral 12.

The inside of the drying chamber 10, mainly the space 11, is partitioned by one or more vertical partition plates 18, and the thrown up material moves irregularly in the front and back direction, which affects the transfer by the stirrer. avoid exposing yourself to Further, since it would be rather inconvenient to extend the hot air outlet 6 to the rear of the drying chamber 10 where the product outlet 16 is provided, the hot air outlet 6 is fixed in front of the product outlet 16. A partition plate 19 is also provided in the drying chamber 10 corresponding to the rear end portion to prevent hot air from blowing through. Further, in the separation space 12, a baffle plate 20 is provided to promote separation of floating matter and gas.

Further, the raw material supply port 14 is heated by heated gas, and a jacket type is adopted to prevent the material from adhering to the sliding surface, or it is provided vertically from the upper part of the drying chamber 10.

Next, the operation of this dryer will be explained. First, the raw material, which is the material to be dried, passes through the gate 15 and the raw material supply port 14, and is directly supplied to the upward center of the stirring blades 3, 3 rotating at an appropriate circumferential speed. Jumps up to a height and falls due to gravity. Some parts are direct stirring blades 3
Some of the particles slide up the sliding plate 7, are struck by the stirring blades 3, are effectively crushed, fall into the groove space 21 formed by the bottom plate 5 and the rotating shaft 1, and are stirred again. It is thrown up by the blade 3 and gradually sent to the product outlet 16 side by the feeding shape of the stirring blade. At the same time, the hot gas introduced into the vessel from the hot air inlet 6 enters from the outside of the stirring shaft 1, flows through the groove space 21 in the same direction as the rotational direction of the stirring blade 3, and enters the space 11 while coming into contact with the material. It contacts the violently bouncing material, dries it, reaches the space 12 with some fine particles, and exits from the exhaust port 13 while being separated from particles having a terminal velocity greater than the rising gas velocity. Get out.

On the other hand, the material is dried in the groove space 21 and the space 11, and after being appropriately retained in the container by the partition plate 18 that prevents it from bypassing in a short time, it is discharged from the product outlet 16.

Another embodiment of the hot air heating groove type stirring dryer of the present invention is shown in FIG. This dryer combines the two stirring shafts 1 of the stirrer 4 in the dryer shown in FIGS. 3 and 4 into one. Therefore, there is only one hot air blowing port 6. The other configurations are the same as the dryers shown in Figures 3 and 4. The structure and operation of this dryer are also clear from the above description of the dryer shown in the drawings and FIGS. 3 and 4, so a repeated explanation will be omitted.

The hot air heating groove type stirring dryer of the present invention can provide superior effects compared to conventional dryers of this type. That is, when both are operated under the same drying conditions, i.e., the same processed material, the same drying capacity, and the same heat source such as waste gas, heating gas temperature, gas amount, etc., the dryer of the present invention has the following advantages compared to the conventional dryer. It can be said that it is effective.

(1) Dryer weight and cost can be significantly reduced.

(2) The installation area of the dryer itself can be significantly reduced.

(3) Reduces pressure loss throughout the drying equipment and reduces power consumption.

(4) The number of agitating blades and other wear and consumable items can be reduced.

This can significantly reduce both equipment costs and running costs.

In the dryer of the present invention, the gas flow introduced into the container is made to be an upward flow over the entire surface to improve contact between the material to be dried and the gas, and the stirring and beating action of the stirring blade is added. As a result, lumps in the powder material are effectively broken up, and the drying capacity per volume of the drying chamber is greatly improved. Also, rising gas flow reduces stirring power, and proper stirring speed, not too fast, reduces wear.

In addition, since the dryer of the present invention has low ventilation resistance for heating gas, it is possible to introduce a large amount of relatively low-temperature heating gas, and the waste heat energy of the waste gas can be effectively used to save resources. Can be done.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an example of a conventional hot air heating groove type stirring dryer, Fig. 2 is a sectional view taken along the line - - in Fig. 1, and Figs. 3 to 5 are hot air heating groove type stirring dryers of the present invention. Fig. 3 is a longitudinal sectional view of one embodiment, Fig. 4 is a sectional view taken along the line - in Fig. 3, and Fig. 5 corresponds to Fig. 4 of another embodiment. FIG. 1... Stirring shaft, 3... Stirring blade, 4... Stirrer, 5...
Bottom plate, 6... Hot air blowing port, 7... Sliding plate, 10... Drying chamber, 13... Exhaust port, 14... Raw material supply port, 16... Product outlet, 18, 19... Partition plate, 20... Baffle plate.

Claims (1)

[Scope of Claims] 1 Consists of a hollow drying chamber having an exhaust port on the upper side, a raw material supply port on the front side, a product outlet on the rear end of the bottom plate, and a stirrer in the lower part; The machine has two stirring shafts equipped with stirring blades that move the material backward while bouncing it upwards. In the hot air heating groove type stirring dryer, the bottom plate of the drying chamber is close to the stirring blade, and the two parallel hollow cylindrical grooves are arranged and rotated in opposite directions with the mutually adjacent sides facing upward. , a hot air inlet is provided over approximately the entire length of both sides of the drying chamber, with the tip of the agitating blade facing downwardly rotating from above, and with its tip approaching the agitating blade; The inner wall plate is shared with the lower side plate of the drying room,
A hot air heating groove type stirring dryer characterized in that the plate is a sliding plate that guides the material splashed up by the stirrer and falling to the stirrer from a direction substantially perpendicular to the rotational tangent direction of the stirring blades. 2. The hot-air heating groove type stirring dryer according to claim 1, wherein the drying chamber is provided with one or more vertical partition plates that partition the inside of the drying chamber in the front-rear direction. 3. The hot air heating groove type stirring dryer according to claim 1 or 2, wherein the drying chamber is provided with a baffle plate above the interior thereof to separate floating matter entrained in the hot air. 4 Consists of a hollow drying chamber with an exhaust port on the upper side, a raw material supply port on the front side, a product outlet on the rear end of the bottom plate, and a stirrer at the bottom. The drying chamber has one stirring shaft attached with a stirring blade that moves backward while flipping up, and the stirring shaft is arranged horizontally in the front-rear direction. In the hot-air heating groove-type stirring dryer, the direction is directed from diagonally above toward the position where the stirring blade is rotating downward, over approximately the entire length of the side plate of the drying chamber on the side where the stirring blade is rotating downward. A hot air inlet is provided with its tip close to the stirring blade, and the inner wall plate of the hot air inlet is shared with the lower side plate of the drying chamber, and the plate is used to catch the material that is thrown up by the agitator and falls. A hot-air heating groove-type stirring dryer characterized by having a sliding plate that guides the stirring blade toward the stirrer from a direction substantially perpendicular to the rotational tangent direction of the stirring blade. 5. The hot-air heating groove type stirring dryer according to claim 4, wherein the drying chamber is provided with one or more vertical partition plates that partition the inside of the drying chamber in the front-rear direction. 6. The hot air heating groove type agitation drying device according to claim 4 or 5, wherein the drying chamber is provided with a baffle plate above the inside thereof to separate floating matter entrained in the hot air.