JP4657982B2 - Drum dryer cleaning device - Google Patents

Description

  The present invention relates to a drum dryer cleaning apparatus for fixing raw material solutions such as fats and oils, foods, resins, etc., plating waste liquid and waste water in various waste water treatment apparatuses to the drum surface, and scraping and collecting solids from the drum surface. Is.

Drum dryers are used in a wide range of industrial fields, such as when powdered dry products are obtained from liquid foods or when liquids containing crystalline components or undissolved components such as plating waste liquids for electrical parts are treated.
For example, in wastewater treatment, wastewater containing harmful chemical substances is generally converted into an aqueous solution such as inorganic salts by a neutralization reaction, etc., and detoxified. Drum dryers are widely used as means for reducing the amount of inorganic salt or non-dissolved substances.

Such drum dryers are typified by a dip type and a top type. In general, a cylindrical drum, a rotating shaft rotatably supported at both ends of the center of the drum, and a scraper are provided. And a scraping device disposed so as to be in contact with the drum surface, and the liquid to be treated is supplied to the drum. For example, in the dip type, the lower part of the drum is immersed in a liquid to be processed supplied to a liquid reservoir (hereinafter referred to as a pan). In addition, the drum is heated and rotated around the rotation axis, and the liquid to be processed in the pan is attached to the drum surface in the form of a film, and the liquid in the liquid to be processed on the drum surface while the drum rotates. A component evaporates and a solid substance is produced | generated (for example, refer patent document 1).
JP-A-9-192404 (page 2-3, FIG. 2)

  In the conventional drum dryer, the scraper is brought into contact with the drum at a predetermined pressure, and the solid matter fixed on the surface of the drum is scraped off by the scraper blade to collect the solid matter.

However, the end face of the drum is structurally inefficient in terms of heat conduction, so that the dried liquid that is not sufficiently dried may remain attached to the vicinity of the end face as it is. If a large amount of such undried solid material is formed, there is a risk that the rotational power of the drum increases, and that the undried fixed material is accidentally peeled off and mixed into the product or the like, resulting in a decrease in product quality.
Therefore, there is a case in which a scraper is brought into contact with the drum end surface to scrape off undried solid matter in the vicinity of the drum end surface.
However, in the vicinity of the end face of the drum, it is difficult to install and adjust the scraper, and there is a problem that it is very difficult to reliably remove undried solid matter.

  The present invention has been made in consideration of such circumstances, and its purpose is to easily and reliably remove undried solids that are easily formed near the end face of the drum of a drum dryer, and to increase the rotational power of the drum. It is intended to provide a drum dryer cleaning device that is stable in terms of operation and product quality by suppressing mixing into products and products.

In order to achieve the above object, the present invention proposes the following means.
The invention according to claim 1 supplies a liquid to be processed such as a waste liquid to the drum surface, and evaporates liquid components such as moisture contained in the liquid to be processed while rotating the drum on the drum surface. A drum dryer cleaning device for fixing solids contained in the liquid to be treated to the drum surface and scraping off the solids, wherein the drum surface is cleaned by blowing steam into the drum surface. A blow pipe is provided, and the steam blow pipe is open to an end surface of the drum.

According to the drum dryer cleaning device of the present invention, since the steam blowing pipe is opened at the end surface of the drum, the steam is sprayed onto the end surface of the drum, and the undried solid matter adhering to the end surface of the drum is sufficiently removed. be able to.
In addition, since the cleaning is performed by steam, maintenance is easy and there is no possibility of wear on the drum, and undried solids are efficiently removed by steam pressure, sensible heat, and latent heat.

  A second aspect of the present invention is the drum dryer cleaning apparatus according to the first aspect, wherein the steam blowing pipe is opened at corners of an end surface and an outer peripheral surface of the drum.

  According to the drum dryer cleaning apparatus of the present invention, since the steam blowing pipes are open at the corners of the end surface and the outer peripheral surface of the drum, steam is injected to the outer peripheral surface of the drum in addition to the drum end surface. Since steam is sprayed on both the outer peripheral surface and the end surface near the corners of the end surface to remove the undried solid matter, the vicinity of the end surface of the drum can be widely cleaned.

  The invention according to claim 3 is the drum dryer cleaning apparatus according to claim 1 or 2, wherein a flow rate for adjusting the amount of steam is provided in a steam supply path for supplying steam to the steam blowing pipe. A control valve is provided.

  According to the drum dryer cleaning apparatus of the present invention, the steam supply path for supplying steam to the steam blowing pipe is provided with a flow rate control valve for adjusting the amount of steam, so that undried solids are generated. Depending on the situation, by adjusting the flow rate of the steam and appropriately adjusting the range in which the steam is sprayed, the dry solids are thoroughly washed with the minimum amount of steam, and the amount of steam used is reduced. Can be suppressed.

  The invention according to claim 4 is the drum dryer cleaning device according to claims 1 to 3, wherein the steam blowing pipe is fixed by a clamp, and the steam supply path includes a flexible hose. It is characterized by being.

  According to the drum dryer cleaning device of the present invention, the steam blowing pipe is fixed by the clamp, and the steam supply path includes the flexible hose, so that it is easy to appropriately set and maintain the steam injection position. Thus, the undried solid matter can be sufficiently removed.

  According to the drum dryer cleaning device of the present invention, it is possible to easily remove undried solids formed in the vicinity of the drum end surface of the drum dryer, and to prevent increase in the rotational power of the drum and mixing into the product, thereby reducing the operating surface. In terms of product quality, stable operation can be performed. In addition, the number of man-hours related to maintenance and adjustment of the scraper can be reduced.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a view showing a dip type drum dryer according to an embodiment of the present invention. In this figure, reference numeral 10 denotes a drum dryer, and reference numeral 20 denotes a scraping device.
In this embodiment, the drum dryer 10 includes a cylindrical drum 12, a pan 15 that is provided in the lower portion of the drum 12 and stores the liquid M to be treated, a scraping device 20, and a cleaning device 50. The drum 12 is provided with a rotating shaft 14 extending from both end faces to both sides and coaxial with the axis O.

The drum 12 is rotatably supported by bearings 16 and 16 via a rotating shaft 14 and is connected to a driving force transmission device 17, and the rotation of the driving source P is transmitted to the driving force transmission device 17 to rotate. It is supposed to be.
The drum 12 is stored in the drum cover 19 and is immersed in the liquid M to be processed stored in the pan 15.

  Further, if necessary, the supply of the liquid M to be processed is controlled from a liquid tank not shown to keep the liquid M to be processed in the pan 15 at a predetermined amount, and the liquid component of the liquid M to be processed The drum 12 can be heated or cooled so that it can be efficiently evaporated.

  The scraping device 30 is disposed on the side outer wall of the drum 12 so as to contact the outer peripheral surface 13A of the drum 12 along the direction of the axis O, and is provided on the scraper 40, the frame 22 of the scraping device, and the frame 22. A pillow block 23 for pivotally supporting the rotating shaft 22A, a position adjusting mechanism (not shown) for adjusting the position of the scraper 40 by rotating the frame 22, and the scraped dry matter is discharged. And a discharge shooter 32.

  As shown in FIG. 3, the scraper 40 includes a blade body 42, a presser member 28, and a support member 24, which are fixed by screws 29 and rotate the drum 12 (in the direction of arrow R). The cutting edge 44 formed on the blade body 42 extends in the direction of the axis O of the drum 12 so that the cutting edge 44 substantially contacts the surface 13 of the drum 12 and scrapes off the solid material 18. It has become.

  The cleaning device 50 includes a steam blowing pipe 52 and a steam control unit 60, a nozzle 54 is formed at the tip of the steam blowing pipe 52, and an outer peripheral surface 13 </ b> A of the drum 12 is formed from the opening of the nozzle 54. Steam S can be injected to the end faces 13B on both sides.

  As shown in FIG. 4, the steam blowing pipe 52 is constituted by, for example, a cylindrical stainless steel (SUS316) pipe, and its upstream side is connected to the outside of the drum dryer 10 through a hole formed in the drum cover 19. As the opening near the opening at the front end of the steam blowing pipe 52 approaches the opening, the shape in the cross section perpendicular to the axis of the steam blowing pipe 52 is gradually flattened and the tip is opened in a long hole shape. For example, as shown in FIGS. 3A and 3B, the nozzle 54 is open to both the outer peripheral surface 13A and the end surface 13B with the corner portion interposed therebetween.

The steam blowing pipe 52 is fixed by a clamp 55 in the vicinity of the injection nozzle 54 and connected to a steam supply source (not shown) by a flexible hose 69 on the upstream side of the flow rate control valve 64 in the steam supply path 68. Has been.
Further, in this embodiment, the injection nozzle 54 is provided in the vicinity of the both end faces 13B of the drum 12 at a position after the drum 12 has passed through the scraper 40, and the outer peripheral face 13A and the end face 13B of the drum 12 are provided. Steam S can be sprayed to both corners of the drum 12.

As shown in FIG. 5, the steam control unit 60 includes an electromagnetic valve 62, a flow control valve 64 that controls the flow rate of the steam S, and a valve 66 that can manually stop the supply of the steam S, The flow control valve 64 and the valve 66 are provided in series.
The steam control unit 60 is supplied with saturated steam S to the electromagnetic valve 62, and when the electromagnetic valve 62 is turned on and off, the steam S is injected from the injection nozzle 54 of the steam blowing pipe 52. Yes.

Next, operations of the drum dryer 10 and the cleaning device 50 having the above-described configuration will be described.
The drum 12 is immersed in the liquid M to be processed stored in the pan 15 and rotates at an appropriate speed around the rotation shaft 14.
As a result, the liquid M to be processed in the pan 15 adheres to the surface 13 of the drum 12 as a film, and the liquid M is dried on the surface 13 of the drum 12 as the rotation progresses, and reaches the position of the scraper 40. Drying is completed, and a solid 18 in the liquid M to be processed is generated on the surface 13 of the drum 12.
The solid tip 18 of the scraper 40 is brought into contact with the solid matter 18 fixed to the surface 13 of the drum 12 to scrape off the solid matter 18.

In parallel with the operation of the drum 12, the steam S is sprayed from the nozzle 54 at the tip of the steam blowing pipe 52 to the corner near the end face of the drum 12 in the following manner to remove undried solid matter.
First, the flow rate of the flow rate control valve 64 of the steam control unit 60 is set to a predetermined value, and the valve 66 is opened.
Next, the electromagnetic valve 62 was turned on and off by a control device (not shown), and the electromagnetic valve 62 was opened for a predetermined time at a predetermined cycle, and provided at the tip of the steam blowing pipe 52. Steam S is sprayed from the spray nozzle 54 in the direction of arrow T. (See FIGS. 3 (a) and 3 (b))
By operating in this way, the steam S is supplied to the steam control unit 60 in parallel with the rotation operation of the drum 12, and the supplied steam S passes from the nozzle 54 to the corner of the drum 12 through the steam blowing pipe 52. Injected toward the end of the drum 12 to remove undried solid matter.

The injection nozzle 54 is opened at the corners of the outer peripheral surface 13A and the end surface 13B in the vicinity of both end surfaces of the drum 12, and the steam is injected to the outer peripheral surface 13A and the end surface 13B, respectively. The end face 13B is extensively and sufficiently washed to remove undried solid matter.
When the blade edge 44 of the scraper 40 is retracted due to wear or the like, the blade body 42 of the scraper 40 is advanced in the direction of the drum 12 by a position adjusting mechanism (not shown) to adjust the tip position.

  According to the cleaning device 50 for the drum dryer 10 according to this embodiment, since the steam blowing pipe 52 opens at the corners of the outer peripheral surface 13A and the end surface 13B of the drum 12, the outer peripheral surface 13A and the end surface 13B of the drum 12 are used. Steam S is sprayed to the corners of the drum 12 and the vicinity of the end surface of the drum 12 is extensively washed, so that undried solid matter adhering to the corner portion near the end surface of the drum can be sufficiently removed. In addition, maintenance is easy, and undried solids are efficiently removed by steam pressure, sensible heat, and latent heat.

  Further, since the cleaning is performed by the steam S, there is no need for a scraper for removing the undried solid matter in the vicinity of the drum end surface, so there is no need for consumable parts and their replacement work. Since adjustment is possible only in the direction, adjustment work is easy, and production or processing costs can be suppressed.

  Further, since the flow rate control valve 64 for adjusting the amount of steam is provided in the steam supply passage 68 for supplying the steam S to the steam blowing pipe 52, the flow rate of the steam S is determined according to the generation state of the undried solid matter. By adjusting the range and appropriately adjusting the range in which the steam S is sprayed, the undried solid matter can be sufficiently washed with the minimum amount of steam S and the amount of use of the steam S can be suppressed.

  Further, since the steam blowing pipe 52 is fixed by the clamp and the steam supply path 68 includes the flexible hose 69, it is easy to appropriately set and maintain the spraying position of the steam S, and to remove the undried solid matter. It can be removed sufficiently.

In the above-described embodiment, the steam S injection condition is adjusted by adjusting the flow rate control valve 64 in accordance with the properties and stagnation of the liquid M to be processed, the strength of the steam in the scraper 40, and the like. The continuous flow and the intermittent injection in various patterns may be performed by adjusting the flow rate of the valve and controlling the opening / closing time of the electromagnetic valve 62 with a timer or the like.
In the above embodiment, the case where the steam S is sprayed to both the outer peripheral surface 13A and the end surface 13B in the vicinity of the drum end surface at the corner of the drum 12 has been described, but only on the end surface 13B of the spray drum 12. On the other hand, steam S may be injected.

  Moreover, about the shape of the injection nozzle 54 provided at the tip of the steam blowing pipe 52, the position to be arranged, the direction of the long hole of the opening, the pitch, the number of holes, the size of the hole, etc., the liquid M to be treated, undried It can be set according to the properties of solid matter and operating conditions, and the use of the clamp 55 and the flexible hose 69 can be set arbitrarily.

Further, in the above embodiment, the case of the dip type drum dryer has been described, but it is naturally applicable to a top type drum dryer that supplies the liquid M to be processed from above the drum 12.
Further, the processing target of the drum dryer 10 may be any of removal of solids in the waste liquid and production of industrial products such as fats and oils, foods, and resins.

It is a figure which shows one embodiment which concerns on this invention, Comprising: It is the longitudinal cross-sectional view which looked at the drum dryer from the front. It is a figure which shows one embodiment which concerns on this invention, Comprising: It is the longitudinal cross-sectional view which looked at the drum dryer from the side surface. It is a figure which shows one Embodiment which concerns on this invention, Comprising: It is a figure which shows a drum dryer and a scraping apparatus. It is a figure which shows one embodiment which concerns on this invention, Comprising: It is a figure which shows the steam blowing pipe | tube of a washing | cleaning apparatus. It is a figure which shows one embodiment which concerns on this invention, Comprising: It is a figure which shows the steam supply path of a washing | cleaning apparatus.

Explanation of symbols

M Liquid to be treated 10 Drum dryer 12 Drum 13 Drum surface 18 Solid material 20 Scraping device 40 Scraper 50 Cleaning device 52 Steam blowing pipe 68 Steam supply path 69 Flexible hose

Claims (4)

A liquid to be processed such as a waste liquid is supplied to the drum surface, and while rotating the drum, liquid components such as moisture contained in the liquid to be processed are evaporated on the drum surface, and the liquid to be processed is applied to the drum surface. A drum dryer cleaning device for fixing the solid matter contained in and scraping off the solid matter,
A steam blowing pipe for cleaning the drum surface by blowing steam into the drum surface;
The apparatus for cleaning a drum dryer, wherein the steam blowing pipe opens at an end face of the drum. A drum dryer cleaning apparatus according to claim 1,
The drum blower cleaning apparatus according to claim 1, wherein the steam blowing pipe is opened at corners of an end surface and an outer peripheral surface of the drum. A drum dryer cleaning device according to claim 1 or 2,
A drum dryer cleaning apparatus, wherein a steam supply passage for supplying steam to the steam blowing pipe is provided with a flow rate control valve for adjusting the amount of steam. A drum dryer cleaning apparatus according to claim 1,
The steam blower pipe is fixed by a clamp, and the steam supply path is provided with a flexible hose.

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