JP3784022B2 - Residence prevention apparatus and method for drying equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for preventing dwelling in a drying facility connected to a dryer that dries an object to be dried generated in a chemical factory, a sewage treatment plant, etc., and produces a dried product.
[0002]
[Prior art]
Many devices have been proposed for drying the material to be dried. The transfer of the material to be dried to the drying material supply port of the dryer is carried by a transfer device such as a screw conveyor or a flight conveyor. (For example, refer to Patent Document 1).
[0003]
Here, the moisture contained in the object to be dried evaporates in the dryer, and the air containing the moisture is contained in the transport line connected to the object to be dried or the discharge port of the dryer or in the transfer device. In some cases, stagnation or reverse flow occurred, and condensation occurred inside these. The dried material to be transported adheres to the powdered or granular material to be condensed, grows and stays in a lump, and the lump becomes an obstacle to the transport of the dried material. The process is disturbed.
[0004]
In addition, even if condensation does not occur, the powdered or granular material of the material to be dried stays in the corners of the conveyance pipe or the transfer device, which not only hinders the transfer of the material to be dried, but also smoothly. This will prevent the transfer of the object to be dried.
[0005]
For this reason, conventionally, it has been necessary to periodically inspect the inside of the conveyance pipeline and the inside of the transfer device.
[Patent Document 1]
Japanese Patent Laid-Open No. 5-104098 (5 pages, FIG. 1)
[0006]
[Problems to be solved by the invention]
However, in the above case, it is troublesome to regularly inspect and clean the inside of the transfer pipe and the transfer device, which increases the running cost including labor costs.
[0007]
Therefore, the main problem of the present invention is to prevent the powdery or granular material of the material to be dried in the conveying pipe or the transfer device from staying, and to perform the drying process without periodically inspecting and cleaning the inside. The goal is to maintain smooth operation and normal operation.
[0008]
[Means for Solving the Problems]
The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
The invention described in claim 1 is provided in a conveyance pipeline that is connected to a drying object supply port or a discharge port of a dryer for manufacturing a dried product from the drying object, and that the drying object is transferred by its own weight fall. The apparatus prevents the stagnation of the object to be dried, and forms an air vent above the transport pipeline, and operates the inside of the dryer under a negative pressure state to allow outside air to flow from the air vent, The retention preventing device is characterized in that an air flow is generated downward from an upper end portion of the conveyance pipeline.
[0009]
(Function and effect)
According to the first aspect of the present invention, the moisture contained in the object to be dried evaporates in the dryer, and the air containing the moisture is supplied to the object to be dried or the discharge port of the dryer by the outside air introduced from the vent. Since no backflow occurs in the conveying pipe line connected to the pipe, and no air or the like accumulates, no condensation occurs inside these. Therefore, since the powdery body and granular material of the to-be-dried material transferred to these do not adhere, it does not become a hindrance to the transfer of to-be-dried material, and does not interfere with a smooth drying process.
[0010]
In addition, the outside air that has flowed in from the air vents generates an air flow in the conveyance pipeline, and assists in the transfer of the powdery or granular material of the material to be dried. It is also possible to prevent the powdery body and the granular body from staying. In addition, since it has taken the structure which flows in external air from a vent hole by driving | running in the inside of a dryer with a negative pressure state, it is not necessary to provide an exhaust fan etc., and there also exists an advantage that installation cost and running cost do not start.
[0011]
As described above, the drying process can be smoothed and normal operation can be maintained at low cost.
[0012]
<Invention of Claim 2>
The invention according to claim 2 is a conveyance pipe lined in communication with a drying object supply port of a dryer for producing a dried product from the substance to be dried; and; And a transfer device for transferring the material to be dried to a road, the device for preventing the material to be dried from staying, and covering an inspection port provided at an upper portion of the transfer device and the inspection port. A stagnation prevention device characterized in that a ventilation port is formed between the inspection port hatch and the inside of the dryer is operated in a negative pressure state to allow outside air to flow from the ventilation port.
[0013]
(Function and effect)
In the invention which concerns on Claim 2, the water | moisture content which a to-be-dried object evaporates in a dryer, the air containing this water | moisture content is the inspection port provided in the upper part of the transfer apparatus, and the inspection port hatch which covers the said inspection port, The outside air that has flowed in through the air vents formed between the air and the air does not flow back into the transport pipeline or the transfer device connected to the drying object supply port of the dryer, and air may accumulate. Because there is no condensation inside these. Therefore, since the powdery body and granular material of the to-be-dried material transferred to these do not adhere, it does not become a hindrance to the transfer of to-be-dried material, and does not interfere with a smooth drying process.
[0014]
In addition, it is possible to prevent an air flow from being generated in the conveyance pipe line or the transfer device due to the outside air flowing in from the air vents, and the powdery or granular material of the object to be dried is prevented from staying in corners or the like inside these. . In addition, since it has taken the structure which flows in external air from a vent hole by driving | running in the inside of a dryer with a negative pressure state, it is not necessary to provide an exhaust fan etc., and there also exists an advantage that installation cost and running cost do not start.
[0015]
As described above, the drying process can be smoothed and normal operation can be maintained at low cost.
[0016]
<Invention of Claim 3>
According to a third aspect of the present invention, a flange portion is formed at an end portion of the inspection port, and a plurality of block bodies are attached to the upper surface of the flange portion at intervals. The stay prevention device according to claim 2, wherein the vent is formed in a portion surrounded by a side surface of the body, an upper surface of the flange portion, and a bottom surface of the inspection port hatch.
[0017]
(Function and effect)
In the invention according to claim 3, since the vent is formed in the portion surrounded by the side surface of each block body, the upper surface of the flange portion, and the bottom surface of the inspection port hatch, it is relatively inexpensive and the outside air Can be provided.
[0018]
In addition, dust and dirt adhering to the surroundings of the vent hole can be cleaned by opening the inspection port hatch, thereby providing excellent maintainability.
[0019]
<Invention of Claim 4>
A fourth aspect of the present invention is the retention prevention device according to any one of the first to third aspects, wherein a filter made of a dustproof filter medium is attached to the vent hole.
[0020]
(Function and effect)
In the invention according to claim 4, since a filter made of a dustproof filter medium is attached to the vent hole, dust and dust do not flow in with the outside air into the transport pipe or the transfer device, so that a smooth drying process is performed. In addition, it is possible to reliably maintain normal operation and to reduce the trouble of cleaning in the drying facility.
[0021]
<Invention of Claim 5>
The invention according to claim 5 is a pipe that communicates with a drying object supply port of a dryer that manufactures a dried product from the object to be dried, and that transports the object to be dried by falling under its own weight. In a drying facility provided with a transfer device that is connected to a pipe line and transfers the substance to be dried to the conveyance pipe line, The object to be dried stays in the drying facility by operating in a state, allowing outside air to flow in from a vent formed above the conveying pipeline, and generating an air flow downward from the upper end of the conveying pipeline. This is a method for preventing retention.
[0022]
(Function and effect)
In the invention according to claim 5, the inside of the dryer is operated in a negative pressure state, and the outside air is allowed to flow into the drying facility, whereby the inside of the transport pipe connected to the drying object supply port of the dryer or the inside of the transfer device Therefore, no condensation occurs in these components because no air flows back and no air accumulates. Therefore, since the powdery body and granular material of the to-be-dried material transferred to these do not adhere, it does not become a hindrance to the transfer of to-be-dried material, and does not interfere with a smooth drying process.
[0023]
In addition, it is possible to prevent an air flow from being generated in the conveyance pipe line or the transfer device due to the outside air flowing in from the vents, and the powdery or granular material of the object to be dried is prevented from staying in corners or the like inside these. In addition, since the outside air is caused to flow by operating the dryer in a negative pressure state, there is an advantage that there is no need to provide an exhaust fan or the like, and there is no equipment manufacturing cost or running cost.
[0024]
As described above, the drying process can be smoothed and normal operation can be maintained at low cost.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
<Outline of drying process>
The outline of the drying process will be described in advance based on one embodiment according to the present invention.
As shown in FIG. 1, first, the material to be dried sent out from the storage feeder 31 that accommodates the material to be dried such as dewatered sludge and can be discharged is passed through the conveying line 13 by its own weight fall. 1 is transferred to the screw conveyor 11 from a supply port 25 of the screw conveyor 11 which is a transfer device. And the to-be-dried thing transferred is transferred to the discharge port 14 of the screw conveyor 11 toward the X direction of the arrow shown in FIG. 2 (2), rotating with the rotation of the screw 12 of the screw conveyor 11. The first drier 32 is charged and filled in the first dryer 32 by its own weight drop through the conveying pipe 15 connected to the discharge port 14. The material to be dried that has been subjected to the primary drying by the first dryer 32 is subjected to the second transfer shown in FIG. 3 by its own weight drop through the conveyance pipe 20 connected to the first dryer 32. It is transferred to the flight conveyor 21 as means. Then, the object to be dried is transferred to the discharge port 23 of the flight conveyor 21 in the Y direction indicated by the arrow by the flight 22, and the second weight is dropped due to its own weight via the transfer conduit 24 connected to the discharge port 23. The inside of the dryer 33 is charged and filled. When the material to be dried is secondarily dried by the second dryer 33, a dried product is generated.
[0026]
<Dryer>
FIG. 4 and FIG. 5 show an embodiment of the first dryer 32 and the second dryer 33. However, the present invention is not limited to the various dryers shown below. That is, as will be described later, anything may be used as long as the inside of the dryer is maintained at a negative pressure with respect to the outside.
[0027]
First, an example of the first dryer 32 will be described.
4 (1) and 4 (2) show a heat transfer heat receiving groove type stirring / drying machine out of the stirring / drying machine which is an embodiment of the first drying machine 32, and the body jacket 1 of the container. Thus, there is shown a dryer of the type in which the vessel wall is used as a heating surface, and the rotary stirring blade 2 has a hollow structure, a heating medium is passed through the hollow structure, and the rotary stirring blade surface is used as a heating surface. Here, FIG. 4A is a front view and a longitudinal sectional view of the heat transfer type grooved agitation dryer, and FIG. 4B is a sectional view in the width direction.
[0028]
As a basic configuration of this heat transfer heat receiving type agitation dryer, two rotary shafts 3 are provided side by side in the longitudinal direction of the container, and a rotary stirring blade 2 is provided at an interval from the rotary shaft 3. The rotary stirring blade 2 has a hollow structure, and has a structure in which a heating medium such as steam is introduced from a heating medium inlet provided in the container, and an object to be dried contacting the rotary stirring blade 2 can be heated. In addition, a body jacket 1 is provided at the bottom of the container so that the container wall can be heated and the object to be dried contacting the container wall can be dried. Further, an exhaust fan (not shown) is provided inside the container, and a carrier gas such as air (natural ventilation) flows from the carrier gas inlet 27 and is exhausted through the carrier gas exhaust port 28, so that the container The inside is kept at a negative pressure relative to the outside.
[0029]
This type of heat transfer heat receiving type agitation dryer is known, and the present invention is not limited to the above basic configuration. For example, it may not be a biaxial shaft as shown in FIG. 4 (2), but may be a multiaxial shaft such as one or four axes. Moreover, although not shown in figure, the hot air receiving dryer which stirs a to-be-dried object with a rotary stirring blade, jumps up and dries it in contact with a hot air and a parallel flow may be used. Moreover, the rotary dryer with a heating pipe which is the 2nd dryer mentioned later may be sufficient. That is, as long as the inside of the dryer is maintained at a negative pressure relative to the outside, it may be a hot air dryer, in other words, any type of dryer.
[0030]
4 (1) and 4 (2), the operation of the heat transfer type grooved stirring dryer will be described. The rotary stirring blade 2 whose surface is heated by a heat medium such as steam is driven. The motor 4 is rotated through the rotation shaft 3 by the rotation of the motor 4. By this rotation, the material to be dried is stirred, and the material to be dried is dried by contact with the surface of the rotary stirring blade 2 or contact with the heated container wall.
Next, an example of the second dryer 33 will be described.
FIG. 5 shows a rotary dryer with a heating tube, which is an embodiment of the second dryer 33. As a basic configuration of the rotary dryer with a heating tube, a rotating cylinder 9 is rotated around its axis by a drive motor 6 via a pinion gear 7 and a girth gear 8. On the inner wall of the rotating cylinder 9, a plurality of heating pipes 5 are stacked in a longitudinal direction at the annular position around the rotation center and along the inner wall of the rotating cylinder. The heating tube 5 is heated by introducing steam or the like as a heat medium, and water or the like that is thermally conducted and condensed with respect to the material to be dried is discharged from the drain outlet.
[0032]
Further, an exhaust fan (not shown) is provided inside the rotating cylinder 9, and a carrier gas such as air (natural ventilation) is introduced from the carrier gas inlet 29, and the carrier gas absorbs moisture moved from the inside of the individual. Since the exhaust is performed through the carrier gas exhaust port 30, the inside is kept at a negative pressure with respect to the outside.
[0033]
This type of rotary dryer with a heating tube is known, and the present invention is not limited to the above basic configuration. Further, it is not a rotary dryer with a heating tube, but a rotary dryer of a type having a scraping blade for scraping up an object to be dried inside a rotating cylinder and supplying hot air in a countercurrent or parallel flow. Also good. Furthermore, the agitation dryer used in the first embodiment may be used. That is, any type of dryer may be used as long as the inside of the dryer is maintained at a negative pressure with respect to the outside.
[0034]
The operation of the rotary dryer with a heating tube shown in FIG. 5 will be described. The heating tube 5 whose surface is heated by a heating medium such as steam rotates as the rotating cylinder 9 rotates, The material to be dried is agitated, and the temperature of the solid is raised by the contact of the material to be dried with the surface of the heating tube 5. Air and carrier gas absorb the moisture that has moved from the inside of the solid to the surface, and the solid is dried. Is done.
[0035]
<Drying equipment>
Based on FIG. 1 thru | or FIG. 3, the drying installation which concerns on this invention provided with the conveyance pipeline and the transfer apparatus is demonstrated.
As shown in FIG. 1, with respect to the conveyance pipeline, the conveyance pipeline 13, the conveyance pipeline 15, the conveyance pipeline 20, and the conveyance pipeline 24 are respectively a discharge port and a screw for a dry object (not shown) in the storage feeder 31. Between the supply port 25 of the conveyor 11, between the discharge port 14 of the screw conveyor 11 and the supply port of the first dryer 32, the discharge port of the first dryer 32, and the supply port (not shown) of the flight conveyor 21 In the meantime, it is connected between the discharge port 23 of the flight conveyor 21 and the supply port of the second dryer 33.
[0036]
FIG. 2A is a plan view of the screw conveyor 11 as the first transfer measure, and FIG. 2B is a cross-sectional view. The screw conveyor 11, which is the first transfer measure, includes a screw 12 including a screw shaft 12a and screw blades 12b and a casing 34 surrounding the screw 12. An inspection port 35 described later is formed in the upper portion of the casing 34, and an inspection port hatch 36 for covering the inspection port 35 is also provided. Although not shown, the inspection port 35 and the inspection port hatch 36 may be provided at a plurality of locations on the upper portion of the casing 34.
[0037]
FIG. 3 shows a partial cross-sectional view of the flight conveyor 21 that is the second transfer device. The flight conveyor 21, which is the second transfer device, includes a pulley 37, a chain 38, a flight 22, and a casing 39 surrounding them. As described above, the inspection port 35 described later is formed on the upper portion of the casing 39, and an inspection port hatch 36 for covering the inspection port 35 is also provided. Here, the first transfer device and the second transfer device are not limited to the above-described screw conveyor or flight conveyor, and may be anything as long as they can transfer an object to be dried.
[0038]
<Inspection and ventilation openings>
The inspection port 35 and the vent 40 will be described with reference to FIGS. 2, 3, and 6 to 10. 9 (1) is a plan view of the inspection port 35, FIG. 9 (2) is a plan view of the inspection port hatch 36, and FIGS. 9 (3) and 9 (4) are AA and BB cross-sectional views, respectively. Show.
[0039]
Inspection ports 35 are formed in the upper portions of the casings 34 and 39 of the screw conveyor 11 that is the first transfer means and the flight conveyor 21 that is the second transfer device, and in the upper portion of the transport pipeline 20 shown in FIG. . The inspection port 35 includes what is generally referred to as a hand hole, and is used for performing various operations such as visual inspection and cleaning in the transfer device and the transfer pipeline. The installation location and the number of installation of the inspection port 35 are arbitrary.
[0040]
A flange portion 35 a is formed at the end of the inspection port 35. As shown in FIG. 9 (1), a block body 41 is fixed to the corner portion of the upper surface of the flange portion 35a by adhesion or fitting, and shock absorbers when the inspection opening hatch 36 is opened and closed. It has become. The inspection opening hatch 36 is fixed to an arbitrary side of the flange portion 35a by a hinge (not shown), and can be opened and closed using a handle 42. The shape of the inspection port is not limited to a rectangle, but may be a circle, an ellipse, or other polygonal shapes.
[0041]
Here, as the material of the block body 41, various plastic materials as a hard resin material, soft resins such as various rubber materials as a soft resin material, and elastic bodies such as a rubber body can be considered. Anything can be used as long as the shock is buffered. In FIG. 9 (1), a total of four block bodies 41 are attached to the corners of the upper surface of the flange portion 35a, but the range in which the vent hole 40 is formed without hindrance to the inflow of outside air to be described later. And the installation location and the number of installation are arbitrary.
[0042]
9 (1), (3), and (4), the vent 40 is formed in a portion surrounded by the side surface of the block body 41, the upper surface of the flange portion 35a, and the bottom surface of the inspection port hatch 36.
[0043]
As described above, since the inside of the first dryer 32 and the second dryer 33 is maintained at a negative pressure with respect to the outside, as shown in FIG. 6, FIG. 7, and FIG. Outside air is introduced through the mouth 40 so as to be pulled toward the dryer.
[0044]
As a result, air containing moisture obtained by evaporating the moisture contained in the object to be dried in the first dryer 32 or the second dryer 33 is provided in the screw conveyor 11, the flight conveyor 21, and the conveyance pipeline 20. The outside air that has flowed in through the vent 40 does not flow back into the transport pipelines 15, 20, 24, the screw conveyor 11, the flight conveyor 21, and the air does not accumulate. No condensation occurs inside.
[0045]
Therefore, since the powdery body and granular material of the to-be-dried material transferred to these do not adhere, it does not become a hindrance to the transfer of to-be-dried material, and a smooth drying process is not hindered.
[0046]
In addition, the outside air that has flowed in from the vent 40 generates an air flow in the transport pipelines 15, 20, 24, the screw conveyer 11, and the flight conveyer 21, and assists in the transfer of the powder or granular material to be dried. For this reason, it is possible to prevent the powdery or granular material of the material to be dried from staying in the corners or the like inside these. In addition, since it has taken the structure which flows in external air from the vent 40 by operating the inside of the 1st dryer 32 and the 2nd dryer 33 in a negative pressure state, it is not necessary to provide an exhaust fan etc., There is no equipment manufacturing cost or running cost.
[0047]
As shown in FIG. 10, if a filter 43 made of a dustproof filter medium is installed in the vent hole 40, dust or dirt along with the outside air will be introduced into the transport pipelines 15, 20, 24, the screw conveyor 11 and the flight conveyor 21. Since dust and the like do not flow in, a smooth drying process and normal operation can be reliably maintained, and the cleaning work in the drying facility is reduced.
[0048]
【The invention's effect】
As described above, according to the present invention, it is possible to prevent stagnation of the powdery or granular material of the material to be dried inside the conveying pipe or the transfer device, and to perform the drying process without periodically inspecting and cleaning the inside. Smoothing and maintaining normal operation are brought about.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining an outline of a drying process.
FIGS. 2A and 2B are a plan view and a cross-sectional view showing an embodiment of a first transfer device. FIGS.
FIG. 3 is a partial cross-sectional view showing an embodiment of a second transfer device.
FIG. 4 is a diagram showing an example of a first dryer.
FIG. 5 is a diagram showing an example of a second dryer.
FIG. 6 is a view for explaining the flow of outside air in one embodiment of the first transfer device.
FIG. 7 is a diagram for explaining the flow of outside air in one embodiment of the second transfer device.
FIG. 8 is a diagram for explaining the flow of outside air from a vent hole installed in a conveyance pipeline.
FIG. 9 is a view showing an inspection port and a ventilation port.
FIG. 10 is a view showing a state in which a filter is attached to the vent hole.
DESCRIPTION OF SYMBOLS 1 ... trunk | drum jacket, 2 ... rotary stirring blade, 3 ... rotating shaft, 4 ... drive motor, 5 ... heating tube, 6 ... drive motor, 7 ... pinion gear, 8 ... girth gear, 9 ... rotating cylinder, 11 ... screw conveyor, DESCRIPTION OF SYMBOLS 12 ... Screw, 12a ... Screw shaft, 12b ... Screw blade, 13 ... Conveyance line, 14 ... Discharge port, 15 ... Conveyance line, 21 ... Flight conveyor, 22 ... Flight, 23 ... Discharge port, 24 ... Conveyance line , 25 ... supply port, 27 ... carrier gas inlet, 28 ... carrier gas exhaust port, 29 ... carrier gas inlet, 30 ... carrier gas exhaust port, 31 ... storage feeder, 32 ... first dryer, 33 ... second Dryer, 34 ... casing, 35 ... inspection port, 35a ... flange, 36 ... inspection port hatch, 37 ... pulley, 38 ... chain, 39 ... casing, 40 ... vent, 41 ... Click body, 42 ... handle, 43 ... filter.

Claims (5)

Prevents stagnation of to-be-dried material in the transport pipe that is connected to the to-be-dried material supply port or discharge port of a dryer that manufactures dried products from the to-be-dried material, and is transported by its own weight fall. A device that performs
By forming a vent above the transport pipe, and operating the inside of the dryer in a negative pressure state, the outside air flows in from the vent,
With a configuration that generates an air flow downward from the upper end of the conveyance pipeline,
The retention prevention apparatus characterized by the above-mentioned. Conveyance pipe line connected to the dry substance supply port of a dryer for producing a dry product from the dry substance, and; connected to the conveyance pipe line and transferring the dry substance to the conveyance pipe line An apparatus for preventing retention of the material to be dried in a drying facility comprising:
A vent is formed between the inspection port provided at the top of the transfer device and the inspection port hatch covering the inspection port,
By operating the inside of the dryer in a negative pressure state, it was configured to allow outside air to flow from the vent.
The retention prevention apparatus characterized by the above-mentioned. A flange portion is formed at an end portion of the inspection port, and a plurality of block bodies are attached to the upper surface of the flange portion at intervals. A side surface of each block body and the flange portion The stay prevention device according to claim 2, wherein the vent is formed in a portion surrounded by an upper surface and a bottom surface of the inspection port hatch. The stay prevention device according to any one of claims 1 to 3, wherein a filter made of a dustproof filter medium is attached to the vent hole. A pipe that is connected to a drying object supply port of a dryer that manufactures a dried product from the substance to be dried, and is connected to the conveyance pipe line to which the substance to be dried is transferred by its own weight fall. A transfer device for transferring the material to be dried to a conveyance pipe, and a method for preventing the material to be dried from staying in a drying facility comprising:
The inside of the dryer is operated in a negative pressure state, and outside air is introduced from a vent formed above the transfer pipeline, and an air flow downward from the upper end of the transfer pipeline is generated in the drying facility. Preventing retention of the material to be dried;
A retention prevention method characterized by that.

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