CN111141124A

CN111141124A - Hot air type wood chip drying system

Info

Publication number: CN111141124A
Application number: CN201911146996.6A
Authority: CN
Inventors: 袁志雄; 晏才文
Original assignee: Jingzhou Huarong Active Carbon Co ltd
Current assignee: Jingzhou Huarong Active Carbon Co ltd
Priority date: 2019-11-21
Filing date: 2019-11-21
Publication date: 2020-05-12

Abstract

The invention discloses a hot air type wood chip drying system, which belongs to the technical field of active carbon processing, and comprises a storage tank, a dryer, a cyclone separator and a filtering device which are sequentially connected; the storage tank is used for storing sawdust to be dried, the dryer comprises a cylinder body, a hot air inlet and a hot air outlet are arranged on the dryer, the hot air inlet and the hot air outlet are respectively positioned at two ends of the cylinder body, and the hot air outlet is connected with a pipeline of the cyclone separator; a blanking channel is arranged between the storage tank and the dryer, and the blanking channel is positioned at the top of the cylinder and is close to the hot air inlet; the barrel is a horizontal barrel, the longitudinal section of the barrel is isosceles trapezoid, one end of the barrel is small-caliber, the other end of the barrel is large-caliber, the hot air inlet is positioned in the middle of the small caliber, and the hot air outlet is positioned above the middle of the large caliber; be provided with the discharge port on the barrel, the discharge port is located the barrel bottom and is close to heavy-calibre one end, has solved the uneven problem of current drying device saw-dust thermally prone.

Description

Hot air type wood chip drying system

Technical Field

The invention relates to the technical field of active carbon processing, in particular to a hot air type wood chip drying system.

Background

China belongs to a large country with abundant wood resources, a large number of branches and wood chips are not utilized every year, if waste materials can be changed into valuable materials, important chemical raw materials are produced by using the branches and the wood chips, and the branches and the wood chips contain a large number of pores, so that the branches and the wood chips have strong adsorption capacity, can decolorize and remove invisible substances, and can be widely applied to aspects of national defense, pharmacy, chemical industry, food, environmental protection and the like.

With the development of agricultural and sideline product processing, the demand of activated carbon is increasing, and the requirements of maltose decoloring, oil and fat deodorization, gas separation and purification, water purification, gold and silver recovery, chemical agent purification, pharmacy and the like can not be kept away. The activated carbon can be sawdust of coniferous hardwood or pulverized branches and sawdust, preferably hard shells such as walnut shell and hammer shell, and large bones of animals.

Activated carbon is in process of production, need carry out drying process to the saw-dust, and current drying device generally all is drum dryer, is provided with the heating coil who is used for drying the saw-dust in the cylinder, and heating coil generally is hot-water line, hot-blast main or electrothermal tube, so design, though can realize the effect that the saw-dust was dried, nevertheless passes through heating coil and conducts heat, and the saw-dust is heated inequality easily, causes the stoving time longer, and the stoving effect is relatively poor.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a hot air type wood chip drying system, which solves the problem that wood chips are easily heated unevenly in the existing drying device.

In order to achieve the purpose, the invention provides the following technical scheme:

a hot air type sawdust drying system comprises a storage tank, a dryer, a cyclone separator and a filtering device which are connected in sequence;

the storage tank is used for storing sawdust to be dried, the dryer comprises a barrel, a hot air inlet and a hot air outlet are formed in the dryer, the hot air inlet and the hot air outlet are respectively located at two ends of the barrel, and the hot air outlet is connected with a pipeline of the cyclone separator;

a blanking channel is arranged between the storage tank and the dryer and is positioned at the top of the cylinder body and close to the hot air inlet;

the barrel is a horizontal barrel, the longitudinal section of the barrel is in an isosceles trapezoid shape, one end of the barrel is small in caliber, the other end of the barrel is large in caliber, the hot air inlet is located in the middle of the small caliber, and the hot air outlet is located above the middle of the large caliber;

the barrel is provided with a discharge port, and the discharge port is located at the bottom of the barrel and close to one end with the large caliber.

Through above-mentioned technical scheme, the saw-dust of treating drying enters into the barrel through the unloading passageway, and hot-air enters into the barrel through hot-blast import, and under the effect of hot gas flow, the saw-dust flows along with hot-air, because hot-air enters into the barrel from the pipeline, enters into big space from the little space promptly, consequently enters into the hot-air in the barrel and will drive the saw-dust and form the air current swirl in the barrel. For the saw-dust that humidity is big, the quality is heavier because the air current can't drive, generally can sink in the barrel bottom earlier, wait steam slowly to be taken away by hot-air, after the quality got lighter gradually, will slowly follow the air and fly apart to the barrel middle part, until being taken away by the air, enter into cyclone. Under the effect of cyclone separator, the saw-dust after drying will be separated out, and air current and some tiny particles will enter into filter equipment, and filter equipment's setting is mainly used for collecting the tiny particle in the air current, clears away the impurity in the air current, makes it reach the emission requirement. By adopting the hot-flow drying method, the sawdust is directly contacted with hot air, so that the moisture in the sawdust can be rapidly driven, the drying speed is high, and the effect is good.

More preferably: a wind shield is arranged in the cylinder, the upper end of the wind shield is fixed at the top in the cylinder, and the lower end of the wind shield is suspended above the central shaft of the cylinder;

the wind shield is arranged in an arc shape, the outer arc surface faces the small caliber, and the inner arc surface faces the large caliber.

More preferably: the deep bead is provided with a plurality ofly, and is a plurality of the deep bead is followed barrel length direction is equidistant to be set up.

More preferably: the dryer also comprises a rotating mechanism, wherein the rotating mechanism comprises a first motor, a connecting shaft, a paddle and a mounting block;

the first motor is fixed in the large-caliber center of the cylinder, one end of the connecting shaft is inserted into the mounting block, the other end of the connecting shaft penetrates through the cylinder and is connected with the first motor, and the mounting block is fixed on the inner wall of the cylinder;

the central shaft of the connecting shaft and the central shaft of the cylinder body are positioned on the same straight line;

the paddle is fixed on the circumferential surface of the connecting shaft and rotates coaxially with the connecting shaft.

More preferably: the circumferential surface of the cylinder body is coated with a jacket, and a hot water inlet and a hot water outlet are arranged on the jacket;

the hot water inlet is located at the bottom of the cylinder body and close to the small-caliber end of the cylinder body, and the hot water outlet is located at the top of the cylinder body and close to the large-caliber end of the cylinder body.

More preferably: the dryer also comprises a material guiding mechanism, wherein the material guiding mechanism comprises a second motor, a material stirring block and a rotating shaft;

the second motor is fixed on the shell of the blanking channel, the rotating shaft is positioned in the blanking channel and is vertical to the central shaft of the blanking channel, and the blanking channel is vertically arranged;

one end of the rotating shaft is inserted into the inner wall of the blanking channel, and the other end of the rotating shaft penetrates through the blanking channel and is connected with the output shaft of the second motor;

the material stirring block is fixed on the circumferential surface of the rotating shaft and used for controlling the wood chip blanking speed.

More preferably: the material shifting block is hexagonal prism-shaped, and the central axis of the material shifting block and the central axis of the rotating shaft are positioned on the same straight line.

More preferably: the hot air blower is used for providing hot air, and an outlet of the hot air blower is connected with the hot air inlet.

More preferably: the cyclone separator is provided with a sawdust outlet, a mixture inlet and a waste gas outlet;

the sawdust outlet is positioned in the center of the bottom of the cyclone separator, so that dried sawdust is discharged outwards through the sawdust outlet;

the waste gas outlet is connected with the filtering device through a pipeline, and the mixture inlet is connected with the hot air outlet through a pipeline.

More preferably: the filtering device is a cloth bag type filter.

In conclusion, the invention has the following beneficial effects: the dryer is mainly divided into two stages in the use process, wherein the first stage is a blanking stage, air is not supplied from the hot air inlet at the moment, the second stage is a hot air drying stage, and hot air enters the barrel through the hot air inlet at the moment. In the first stage, second motor and first motor all are in the open mode, and the pivot drives group material piece and rotates for the saw-dust of waiting to dry slowly enters into the barrel along with group material piece's rotation, and the paddle rotates the in-process, can constantly stir the saw-dust in the barrel, makes the saw-dust in the barrel be heated evenly, and the stoving is mainly through the hot water in the clamp cover this moment. In the second stage, first motor is in the on-state, and the work of second motor stops, and the saw-dust in the barrel has carried out once heating at first stage in-process, but the degree of dryness still is not enough, perhaps some saw-dust degree of dryness has reached, some have not reached yet, consequently in order to improve the stoving effect, has set up the hot air current and has dried, makes the saw-dust that meets the requirements enter into cyclone through hot air outlet and carries out cyclone. The paddle mainly plays the stirring effect in the first stage, and in the second stage, mainly used breaks up the air current, forms new air current swirl, improves the saw-dust dwell time, and the stoving effect is better.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment, which is mainly used for embodying the structure of a wood chip drying system;

fig. 2 is a schematic sectional view of an embodiment, which is mainly used for embodying the structure of the dryer.

In the figure, 1, a storage tank; 2. a dryer; 21. a barrel; 22. a jacket; 23. a hot water inlet; 24. a discharge port; 25. a hot water outlet; 26. a wind deflector; 271. a material stirring block; 272. a rotating shaft; 281. a first motor; 282. a connecting shaft; 283. a paddle; 284. mounting blocks; 3. a cyclone separator; 4. a filtration device; 5. a hot air inlet; 6. a blanking channel; 7. a sawdust outlet; 8. and a hot air outlet.

Detailed Description

The invention is described in detail below with reference to the figures and examples.

Example (b): a hot air type wood chip drying system, as shown in fig. 1-2, comprises a hot air blower (not shown in the figure) for providing hot air, and a storage tank 1, a dryer 2, a cyclone separator 3 and a filtering device 4 which are connected in sequence. The storage tank 1 stores wood chips to be dried, and the dryer 2 comprises a cylinder 21, a rotating mechanism and a material guiding mechanism. The dryer 2 is provided with a hot air inlet 5 and a hot air outlet 8, the hot air inlet 5 and the hot air outlet 8 are respectively positioned at two ends of the cylinder 21, and the hot air outlet 8 is connected with the cyclone separator 3 through a pipeline. Be provided with unloading passageway 6 between holding vessel 1 and drying-machine 2, unloading passageway 6 upper end and 1 bottom exit linkage of holding vessel, the lower extreme is connected with barrel 21 top, and unloading passageway 6 is close to with hot-blast import 5. Specifically, the air heater export is connected with hot-blast 5 pipe connections of import, and the air heater is arranged in heating air and lets in the hot-air after will heating to barrel 21 to make the hot-air fully contact with the saw-dust of waiting to dry in the barrel 21, realize this function of drying. Specifically, the cyclone separator 3 is provided with a wood chip outlet 7, a mixture inlet and a waste gas outlet. The sawdust outlet 7 is positioned at the center of the bottom of the cyclone separator 3, and the dried sawdust is discharged outwards through the sawdust outlet 7. The waste gas outlet is connected with the filtering device 4 by a pipeline, and the mixture inlet is connected with the hot air outlet 8 by a pipeline. The filter device 4 is a bag filter.

In the above technical scheme, the wood chips to be dried enter the cylinder 21 through the blanking channel 6, the hot air enters the cylinder 21 through the hot air inlet 5, the wood chips flow along with the hot air under the action of the hot air flow, and the hot air entering the cylinder 21 drives the wood chips to form airflow vortexes in the cylinder 21 because the hot air enters the cylinder 21 from the pipeline, namely enters the large space from the small space. For the sawdust with high humidity and heavy mass, because the air flow can not drive, the sawdust generally sinks at the bottom in the cylinder 21 firstly, when water vapor is slowly taken away by hot air, the sawdust gradually becomes light in mass, and then the sawdust slowly flies to the middle of the cylinder 21 along with the air until being taken out by the air and enters the cyclone separator 3. Under the effect of cyclone 3, the saw-dust after drying will be discharged outward through saw-dust export 7, and air current and some tiny particles will enter into the bag filter, and filter equipment 4's setting is mainly used for collecting the tiny particle in the air current, clears away the impurity in the air current, makes it reach the emission requirement.

Referring to fig. 1-2, specifically, the barrel 21 is a horizontal barrel, the longitudinal section of the barrel is an isosceles trapezoid, one end of the barrel 21 is a small caliber, the other end of the barrel is a large caliber, the hot air inlet 5 is located in the middle of the small caliber, and the hot air outlet 8 is located above the middle of the large caliber. The cylinder 21 is provided with a discharge port 24, and the discharge port 24 is positioned at the bottom of the cylinder 21 and close to one end with a large caliber. The discharge port 24 is plugged or fitted with a control valve to facilitate closing or opening of the discharge port 24.

In above-mentioned technical scheme, it is big to set the one end diameter with barrel 21 to, the one end diameter is little, mainly used changes barrel 21 space size, when the air current blows to barrel 21 wide bore end from barrel 21 small bore end, because barrel 21 space grow gradually, will produce the vortex in barrel 21, prolonged the stay time of saw-dust in barrel 21 and the contact time of saw-dust and hot-air, improved the area of contact of saw-dust and hot-air, the stoving effect is better, the stoving time has been shortened. Set barrel 21 to horizontal barrel and longitudinal section for isosceles trapezoid in addition, the saw-dust of can being convenient for subsides the bottom in barrel 21, the saw-dust that just drops from holding vessel 1, humidity is big, the quality is heavy, consequently generally all can pile up bottom in barrel 21 earlier, along with the blowing of hot-air, steam in the saw-dust is slowly taken away, begin to follow the hot-air gradually and remove and fly in barrel 21, up to flying to the inside top of barrel 21, then enter into cyclone 3 through hot air outlet 8. The discharge port 24 is provided to discharge impurities having a relatively heavy weight, such as iron wires, wood blocks, etc., which cannot be blown up by hot air due to their own weight, and thus are accumulated only at the inner bottom of the large-diameter end of the drum 21.

Referring to fig. 1-2, a wind shield 26 is arranged in the cylinder 21, the upper end of the wind shield 26 is fixed at the top of the cylinder 21, and the lower end is suspended above the central axis of the cylinder 21. The wind deflector 26 is arc-shaped with the outer arc facing the small caliber and the inner arc facing the large caliber. The wind guard 26 is provided in plural, and the wind guards 26 are provided at equal intervals along the longitudinal direction of the cylinder 21. Specifically, in the present embodiment, four wind deflectors 26 are provided.

In the above technical solution, the wind shield 26 is mainly used to form a plurality of air swirls to prolong the stay time of the wood chips in the cylinder 21.

Referring to fig. 1-2, dryer 2 further includes a rotation mechanism including a first motor 281, a connecting shaft 282, paddles 283, and a mounting block 284. The first motor 281 is fixed at the large-caliber center of the cylinder 21, one end of the connecting shaft 282 is inserted into the mounting block 284 and is in running fit with the mounting block 284, the other end passes through the cylinder 21 and is connected with the output shaft of the first motor 281, and the mounting block 284 is fixed on the inner wall of the cylinder 21. The central axis of the connecting shaft 282 is aligned with the central axis of the cylinder 21. The paddle 283 is fixed to the circumferential surface of the connecting shaft 282 and rotates coaxially with the connecting shaft 282. Specifically, paddle 283 is a two-inclined-blade paddle, paddle 283 is provided with a plurality of, and a plurality of paddles 283 are equidistant along the length direction of connecting shaft 282. The circumferential surface of the cylinder 21 is coated with a jacket 22, and the jacket 22 is provided with a hot water inlet 23 and a hot water outlet 25. The hot water inlet 23 is located at the bottom of the cylinder 21 and close to the small-caliber end of the cylinder 21, and the hot water outlet 25 is located at the top of the cylinder 21 and close to the large-caliber end of the cylinder 21. Preferably, the hot water temperature is 40-90 deg.C, and particularly, in the present embodiment, the hot water temperature is 60 deg.C. Besides hot water heating and drying, gas generated by burning wood chip boundary skin can be introduced into the jacket, or an electric heating mode is directly adopted, so that the wood chips are dried. The material guiding mechanism comprises a second motor (not shown in the figure), a material shifting block 271 and a rotating shaft 272. The second motor is fixed on the shell of the blanking channel 6, the rotating shaft 272 is positioned in the blanking channel 6 and is vertical to the central shaft of the blanking channel 6, and the blanking channel 6 is vertically arranged. One end of the rotating shaft 272 is inserted on the inner wall of the blanking channel 6 and is in running fit with the inner wall of the blanking channel 6, and the other end passes through the blanking channel 6 and is connected with the output shaft of the second motor. The material stirring block 271 is fixed on the circumferential surface of the rotating shaft 272 and is used for controlling the wood chip blanking speed. The material pulling block 271 is hexagonal prism-shaped, and the central axis of the material pulling block 271 and the central axis of the rotating shaft 272 are located on the same straight line.

In the above technical scheme, hot water enters the jacket 22 through the hot water inlet 23, is discharged outwards through the hot water outlet 25 after heat exchange, and the dryer 2 is mainly divided into two stages in the using process, wherein the first stage is a blanking stage, air is not supplied to the hot air inlet 5, the second stage is a hot air drying stage, and hot air enters the cylinder 21 through the hot air inlet 5. In the first stage, the second motor and the first motor 281 are both in an open state, and the rotating shaft 272 drives the material stirring block 271 to rotate, so that the wood chips to be dried slowly enter the barrel 21 along with the rotation of the material stirring block 271, and the blades 283 rotate in the rotating process, so that the wood chips in the barrel 21 are continuously stirred, the wood chips in the barrel 21 are uniformly heated, and at the moment, the drying is mainly performed by hot water in the jacket 22. In the second stage, first motor 281 is in the on-state, the second motor stops working, in order to facilitate the control of the sawdust unloading, a plugging device can be installed on the unloading passageway 6, such as a valve, the sawdust in the barrel 21 is heated once in the first stage process, but the dryness is still not enough, or some sawdust dryness has been reached, something has not yet reached, consequently, in order to improve the drying effect, hot air flow drying is set, the sawdust meeting the requirements enters into cyclone 3 through hot air outlet 8 to be subjected to cyclone separation. Paddle 283 is in the first stage, mainly plays the stirring effect, and in the second stage, mainly used breaks up the air current, forms new air current swirl, improves the saw-dust dwell time, and stoving effect is better.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that several improvements and modifications without departing from the principle of the present invention will occur to those skilled in the art, and such improvements and modifications should also be construed as within the scope of the present invention.

Claims

1. The utility model provides a hot-blast formula saw-dust drying system which characterized in that: comprises a storage tank (1), a dryer (2), a cyclone separator (3) and a filtering device (4) which are connected in sequence;

sawdust to be dried is stored in the storage tank (1), the dryer (2) comprises a barrel (21), a hot air inlet (5) and a hot air outlet (8) are arranged on the dryer (2), the hot air inlet (5) and the hot air outlet (8) are respectively positioned at two ends of the barrel (21), and the hot air outlet (8) is connected with the cyclone separator (3) through a pipeline;

a blanking channel (6) is arranged between the storage tank (1) and the dryer (2), and the blanking channel (6) is positioned at the top of the barrel (21) and is close to the hot air inlet (5);

the barrel (21) is a horizontal barrel, the longitudinal section of the barrel is isosceles trapezoid, one end of the barrel (21) is small in caliber, the other end of the barrel is large in caliber, the hot air inlet (5) is located in the middle of the small caliber, and the hot air outlet (8) is located above the middle of the large caliber;

the barrel (21) is provided with a discharge port (24), and the discharge port (24) is located at the bottom of the barrel (21) and close to one end with the large caliber.

2. The hot air type wood chip drying system according to claim 1, wherein: a wind shield (26) is arranged in the cylinder (21), the upper end of the wind shield (26) is fixed at the inner top of the cylinder (21), and the lower end of the wind shield is suspended above the central shaft of the cylinder (21);

the wind shield (26) is arranged in an arc shape, the outer arc surface faces the small caliber, and the inner arc surface faces the large caliber.

3. The hot air type wood chip drying system according to claim 2, wherein: the wind deflectors (26) are arranged in a plurality, and the wind deflectors (26) are arranged at equal intervals along the length direction of the cylinder (21).

4. The hot air type wood chip drying system according to claim 1, wherein: the dryer (2) further comprises a rotating mechanism, wherein the rotating mechanism comprises a first motor (281), a connecting shaft (282), blades (283) and a mounting block (284);

the first motor (281) is fixed at the large-caliber center of the barrel (21), one end of the connecting shaft (282) is inserted into the mounting block (284), the other end of the connecting shaft penetrates through the barrel (21) and is connected with the first motor (281), and the mounting block (284) is fixed on the inner wall of the barrel (21);

the central shaft of the connecting shaft (282) and the central shaft of the cylinder body (21) are positioned on the same straight line;

the paddle (283) is fixed on the circumferential surface of the connecting shaft (282) and rotates coaxially with the connecting shaft (282).

5. The hot air type wood chip drying system according to claim 1, wherein: the circumferential surface of the cylinder body (21) is coated with a jacket (22), and the jacket (22) is provided with a hot water inlet (23) and a hot water outlet (25);

the hot water inlet (23) is located at the bottom of the cylinder body (21) and close to the small-caliber end of the cylinder body (21), and the hot water outlet (25) is located at the top of the cylinder body (21) and close to the large-caliber end of the cylinder body (21).

6. The hot air type wood chip drying system according to claim 1, wherein: the dryer (2) also comprises a material guiding mechanism, wherein the material guiding mechanism comprises a second motor, a material stirring block (271) and a rotating shaft (272);

the second motor is fixed on the shell of the blanking channel (6), the rotating shaft (272) is positioned in the blanking channel (6) and is vertical to the central shaft of the blanking channel (6), and the blanking channel (6) is vertically arranged;

one end of the rotating shaft (272) is inserted on the inner wall of the blanking channel (6), and the other end of the rotating shaft penetrates through the blanking channel (6) and is connected with the output shaft of the second motor;

the material stirring block (271) is fixed on the circumferential surface of the rotating shaft (272) and is used for controlling the wood chip blanking speed.

7. The hot air type wood chip drying system of claim 6, wherein: the material poking block (271) is hexagonal prism-shaped, and the central axis of the material poking block (271) and the central axis of the rotating shaft (272) are positioned on the same straight line.

8. The hot air type wood chip drying system according to claim 1, wherein: the hot air blower is used for providing hot air, and an outlet of the hot air blower is connected with the hot air inlet (5).

9. The hot air type wood chip drying system according to claim 1, wherein: the cyclone separator (3) is provided with a wood chip outlet (7), a mixture inlet and a waste gas outlet;

the sawdust outlet (7) is positioned in the center of the bottom of the cyclone separator (3) so that dried sawdust is discharged outwards through the sawdust outlet (7);

the waste gas outlet is connected with the filtering device (4) through a pipeline, and the mixture inlet is connected with the hot air outlet (8) through a pipeline.

10. The hot air type wood chip drying system of claim 9, wherein: the filtering device (4) is a cloth bag type filter.