KR20010016746A - The Drying Device for Sludge - Google Patents

Abstract

PURPOSE: A sludge drying apparatus is provided, which is characterized in that sludge is dried by contacting with the wall of inside cases(14, 24, 34) which are heated by hot steam generated from an incinerator. CONSTITUTION: The apparatus consists of three dryers(10, 20, 30) which have outside cases(12, 22, 32), inside cases(14, 24, 34) being vapor moving paths(13, 23, 33), inputs(13, 23, 33) for inputting sludge, shafts(15, 25, 35) equipped with blades(16, 26, 36). Scrapers(17, 27, 37) attached to the end of the blades are declined by regular angle for moving sludge and enhancing contact with the wall thereof. Right and reverse rotation cycle of the shaft(15) is 15-30minutes in the first dryer, and rotation cycle of the shaft is 3-10minutes in the second dryer, and in the third dryer, right and reverse rotation of the shaft is 3-10, 15-30minutes respectively.

Description

Sludge Drying Equipment {The Drying Device for Sludge}

The present invention relates to a sludge drying apparatus for drying the sludge (sludge) to the maximum compression by using superheated steam heated to a high temperature, and in particular, recovers the incineration heat generated from waste incinerators, etc., and generates superheated steam by using the same. It is a sludge drying device in which sludge is dried by transferring steam to a sludge drying device to raise the temperature of the inner wall in direct contact with the sludge.

As industrial activities become more active, the disposal of large amounts of industrial waste is a serious problem. Among industrial wastes, dry wastes such as construction wastes can be disposed of in waste dumps, but industrial wastes such as sludge or sludge have a lot of difficulties in their disposal.

Sludge is a mud-shaped industrial waste that contains a lot of moisture, and it contains many harmful substances, which causes many problems such as polluting the soil when disposed in a liquid state. Is forbidden. Such sludge is generated throughout the industrial sector, such as large-scale operations, pulp mills, leather, cardboard production plants, or sewage treatment plants.

Conventionally, various methods and apparatuses have been developed and used to remove water from sludge. For example, a device has been developed that removes water using a press roller, a dewatering roller, a filter cloth, etc., or a method of removing water by crushing it using a crusher while transferring the sludge and then heating it again. Because it processes in a lump state, it does not have a satisfactory water removal effect. In addition, the use of electrical energy and petroleum energy to remove moisture from the sludge was a costly waste of energy.

The present invention has been made to solve the above problems, an object of the present invention is to provide a sludge drying apparatus that improves the drying effect of the sludge by repeating the surface contact with the heat transfer medium by thinning the sludge during the sludge drying. have.

Another object of the present invention is to recover the incineration heat generated in the incinerator during the general waste incineration, such as waste building materials, waste tires and energy-saving sludge drying used in the sludge drying apparatus by generating superheated steam using the incineration heat To provide a device.

The sludge drying apparatus of the present invention for achieving the above object is to form a steam flow path inside the outer cylinder and the outer cylinder and penetrates the inlet and the inner cylinder hole through the inner cylinder and the outer cylinder and the steam movement passage and the scraper is Many connected blades are attached and fixed for a certain period of time. A first drying furnace having a first discharge port having a rotating shaft for repeating reverse rotation; The inner cylinder and the inner cylinder forming the steam flow path inside the outer cylinder and a plurality of blades penetrated through the center of the inner cylinder and the scraper is attached and fixed for a predetermined time. A second drying furnace having a second discharge port having a rotating shaft for repeating reverse rotation; And an inner cylinder and an inner cylinder forming a steam flow path inside the outer cylinder, and a plurality of blades connected with a scraper through the center of the inner cylinder are attached and fixed for a predetermined time. It consists of a third drying furnace in which a rotating shaft and an outlet opening are repeated.

Figure 1 is a side cross-sectional view of the sludge drying apparatus of the present invention

Figure 2 is a front sectional view of the sludge drying apparatus of the present invention

3 is an enlarged cross-sectional view of part A of FIG.

Figure 4 is a perspective view showing the installation state of the blade connected to the scraper

5 is a connection diagram with an incinerator applied to the sludge drying apparatus of the present invention

<Explanation of symbols for main parts of drawing>

10: first drying furnace 11: inlet 12: outer cylinder

13: steam passage 14: inner cylinder 15: rotating shaft

16: blade 17: scraper 18: flange

19: first exit 20: second drying furnace 22: outer cylinder

23: steam moving path 24: inner cylinder 25: rotating shaft

26: blade 27: scraper 28: flange

29: 2nd outlet 31: outlet 32: outer cylinder

33: steam flow path 34: inner cylinder 35: rotating shaft

36: blade 37: scraper 38: flange

Hereinafter, the sludge drying apparatus of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a side cross-sectional view of the sludge drying apparatus of the present invention. The sludge drying apparatus of the present invention is composed of three stages of the first drying furnace 10 of the uppermost layer and the second drying furnace 20 located below and the third drying furnace 30 located below. In each drying furnace (10, 20, 30), superheated steam generated by the heat recovered from the incineration heat generated in the incinerator is supplied to each drying furnace (10, 20, 30). The structure of each drying furnace (10, 20, 30) is essentially similar, and the input and discharge of the sludge differs depending on the type of sludge depending on the type of sludge according to the continuous drying process. In the first drying furnace 10, the scraper is rotated inside, and the scraper repeats the forward and reverse rotation about 15 to 30 minutes so that the sludge adheres as closely as possible to the drum surface of the inner cylinder. Increase the efficiency. The second drying furnace 20 is similar in structure to the first drying furnace 10, and finely grinds the sludge mass generated during drying by repeating the forward and reverse rotation of the scraper for about 3 to 10 minutes. To dry. The third drying furnace 30 has an internal structure and operation principle similar to those of the first and second drying furnaces 10 and 20, and the scraper operation is repeatedly operated at about 3 to 10 minutes for forward rotation and 15 to 30 minutes for reverse rotation. The sludge is refined and discharged in a powder state.

The first drying furnace 10 is provided with an inlet 11 for injecting sludge adjacent to one end portion on the upper surface. Since the position of the inlet 11 is high, it is supplied using a belt conveyor or screw conveyor (not shown) used for sludge input. The sludge supplied from the belt conveyor or the screw conveyor contains a lot of moisture.

In the first drying furnace 10, an outer cylinder 12 is provided at the outermost side, and an inner cylinder 14 having a diameter smaller than that of the outer cylinder 12 is provided inside the outer cylinder 12. Since the outer cylinder 12 and the inner cylinder 14 are different in diameter from each other, a space is formed therebetween, and this is a steam moving path 13 which is a passage through which superheated steam supplies heat required for drying the sludge.

Although not shown in detail, the steam moving path 13 is supplied and discharged from the superheated steam by a pipe f connected through the flange 18. The position of the superheated steam pipe f connected to the steam moving path 13 may be appropriately changed depending on the structure of the sludge drying apparatus of the present invention and the position of the incinerator.

Superheated steam is supplied simultaneously to the first, second and third drying furnaces (10, 20, 30). The superheated steam supplied to the steam moving path 13 heats the inner cylinder 14. Although the pipes f for superheated steam supply are not shown in the second and third drying furnaces 20 and 30, they may be installed in a structure similar to the pipes f of the first drying furnace 10.

Inside the inner cylinder 14, the rotating shaft 15 is provided in the longitudinal direction along the central axis of the inner cylinder 14. As shown in FIG. The rotating shaft 15 is connected to a motor (not shown) so as to rotate forward or reverse according to a control signal. The rotating shaft 15 driven by the motor repeats the forward rotation and the reverse rotation at a predetermined time period to increase the drying efficiency of the sludge. It has been found that the predetermined time is about 3 to 30 minutes, and the drying and forward rotations can be maximized to maximize the drying efficiency. However, it is obvious that this can be changed to have an optimal cycle depending on the sludge input, the size of the drying furnace, the rotation speed of the motor, and the like.

In addition, a plurality of blades 16 are attached to the surface of the rotating shaft 15. The blade 16 is for advancing while mixing the sludge introduced. In addition, a scraper 17 is attached to the end of the blade 16. The scraper 17 is inclined at an end portion so that the sludge containing water adheres to the surface of the inner cylinder 14 and scrapes off from the surface. The blades 16 are also alternately attached to one another along the axis of rotation 15 to facilitate the movement of the sludge. Sludge adhered to and separated from the surface of the inner cylinder 14 by the action of the scraper 17 is dried by the heat of superheated steam emitted while passing through the steam moving path 13.

The first discharge port 19 is configured under the opposite position of the inlet 11 so that the moving sludge moves vertically downward. The moved sludge is freely dropped through the first discharge port 19 and is introduced into the second drying furnace 20. The second drying furnace 20 has an outer cylinder 22 positioned at the outermost side and an inner cylinder 24 positioned inside the outer cylinder 22 and forming a steam passage 23 therebetween. And, penetrating the center of the inner cylinder 24 is attached to a plurality of blades 26 attached to the scraper 27 at the end and has a rotating shaft 25 for repeating the forward and reverse rotation for a predetermined time, the first throw hole It has the structure in which the 2nd discharge port 29 was formed in the opposite position to 19. This is essentially similar to the first drying furnace 10 and the effect is similar, so the detailed description is omitted.

However, in the second drying furnace 20, the forward and reverse rotation periods of the rotating shaft 25 are shortened, unlike the first drying furnace 10, under the conditions of the same rotational speed as the motor of the first drying furnace 10. It becomes about 10 minutes. By doing so, there is an advantage that the sludge mass generated during drying can be dried while being crushed more finely than in the first drying furnace 10. The rotation direction and period of the rotation shaft 25 can be controlled in a forward and reverse direction by adjusting a power source supplied to a motor (not shown), and this function can be easily automated by automatic control (P.C) technology.

While passing through the second drying furnace 20, the dried and finely ground sludge is dropped into the third drying furnace 30 through the second discharge port 29. The structure of the third drying furnace 30 has an outer cylinder 32 positioned at the outermost side, and an inner cylinder disposed at an inner side of the outer cylinder 32 and forming a steam moving path 33 between the outer cylinder 32 ( 34 and a plurality of blades 36 through which a scraper 37 is connected to an end thereof, penetrating the center of the inner cylinder 34, and having a rotating shaft 35 repeating forward and reverse rotations for a predetermined time. A discharge port 31 is formed at a position opposite to the discharge port 29.

The third drying furnace 30 also has a structure essentially similar to the first and second drying furnaces 10 and 20. However, in the third drying furnace 30, the sludge is further pulverized into fine powder and discharged in a powder state. This is due to the effect of further grinding and drying as the dryers go through. For this purpose, the forward rotation and the reverse rotation of the rotation shaft 35 are achieved by repeating the periods of about 3 to 10 minutes for forward rotation and about 15 to 30 minutes for reverse rotation, respectively. The powder component finally discharged through the outlet 31 by the sludge drying apparatus of the present invention can be reduced by more than 85% in volume and weight loss, the water content can be reduced to less than 10%.

Fig. 2 is a sectional view of the sludge drying apparatus of the present invention, showing the shape of the outer cylinder, the inner cylinder, and the shape of the blade and the scraper. In addition, the inlet 11, the first outlet 19, the second outlet 29, and the outlet 31 are all marked for convenience of description and detailed structure description, but this should be determined based on FIG. . For convenience of explanation, the first drying furnace 10 is selected and described.

A cylindrical outer cylinder 12 is positioned at the outermost side of the first drying furnace 10, and an inner cylinder 14 having a cylindrical diameter and smaller than the outer cylinder 12 is also provided at regular intervals. The space between the outer cylinder 12 and the inner cylinder 14 constitutes a steam moving path 13 which is a passage through which superheated steam moves. The supplied superheated steam 13 dissipates heat while being transported in the longitudinal direction along the outer cylinder 12 and the inner cylinder 14. The dissipated heat is dissipated to the inner space where the sludge passing through the inner cylinder 14 is stored, and this heat source dries the sludge attached to the inner surface of the inner cylinder.

The blade 16 located in the inner cylinder 14 protrudes in the shape of a pinwheel around the rotation shaft 15, and a scraper 17 is attached to each end of each blade 16. The scraper 17 is inclined at an angle with respect to the surface of the inner cylinder 14 so that the sludge is automatically moved by the angle of the scraper when the scraper 17 rotates, so that the sludge is discharged through the first drying furnace 10. do. The scraper 17 also increases the drying efficiency by bringing the sludge passing through the inner cylinder 14 as close as possible to the surface of the inner cylinder 14. The outer cylinder 12 and the inner cylinder 14 are blocked by the flange 18 located before and after. FIG. 3 is an enlarged view of portion "A" of FIG. 2, showing the installation form of the blade 16 and the scraper 17 in detail.

In the above description, although one blade 16 is shown as being coupled to one scraper 17, the blade 16a having a pair of blades in one scraper 17 is used to increase the crushing effect of the sludge. It is also possible. It is evident that this form increases the sludge mixing effect and the drying efficiency. 4 shows that the scraper 17 is coupled to a blade having a pair of blades 16a. Even in this case, the respective blades 16 are attached in a staggered form with respect to the rotation axis 15.

Superheated steam supplied to the drying furnace (10, 20, 30) of the present invention by heating the water directly to the steam to be supplied through the steam moving furnace or used to recover the incineration heat from the conventional incinerator as shown in FIG. It is possible to do In the latter case, two effects can be achieved simultaneously with energy conservation and environmental pollution prevention.

In the incinerator, primary and secondary incinerations are carried out in the primary and secondary combustion chambers, respectively, while the waste to be incinerated is introduced through the input device. At this time, a heat exchanger is installed between the secondary combustion chamber and the cyclone dust collector, and the heat generated by recovering the incineration heat is installed in the furnace side of the incinerator flue or cyclone dust collector, and the superheater is switched to the superheated steam to supply the superheated steam to the sludge drying apparatus. The superheated steam supplied is used as the main heat source for drying the sludge as described above.

The structure for supplying the superheated steam to the steam moving furnace of the sludge drying apparatus may be appropriately changed according to the structure of the incinerator or the apparatus for generating the superheated steam, which should be considered in the application of the slush drying apparatus of the present invention.

As described above, according to the present invention, there is an advantage of drying the sludge by recovering the incineration heat generated in the incinerator and generating the superheated steam by using the recovered heat, transferring the sludge to the sludge drying apparatus, and raising the temperature of the inner wall in direct contact with the sludge. have.

Although the invention has been described in detail only with respect to the specific examples described, it will be apparent to those skilled in the art that modifications and variations can be made within the spirit and scope of the invention, and such variations or modifications will belong to the appended claims. .

Claims (5)

In the apparatus for removing water from the sludge, the sludge drying apparatus has three stages: a first drying furnace 10 at the top and a second drying furnace 20 located at the bottom thereof and a third drying furnace 30 at the bottom thereof. The sludge drying apparatus, characterized in that the input and discharge of the sludge is made in a continuous process. The method of claim 1 The sludge drying furnaces 10, 20, 30 have inner cylinders 12, 22, 32 and inner cylinders 14, 24 that form steam passages 13, 23, 33 inside the outer cylinders 12, 22, 32. , 34), and through the outer cylinders (12, 22, 32) and the steam flow paths (13, 23, 33) are in communication with the inner cylinders (14, 24, 34) and the inlet (lower) for injecting sludge ( 11, 19, 29 and blades 16, 26, 36 having scrapers 17, 27, 37 connected to ends of the rotating shafts 15, 25, 35 passing through the centers of the inner cylinders 14, 24, 34. The sludge drying apparatus, characterized in that the plurality of attachment and the discharge port 31 is formed in the opposite position of the discharge port (29). The method of claim 1 The forward rotation reverse rotation period of the rotation shaft 15 of the first drying furnace 10 is 15-30 minutes, the forward rotation reverse rotation cycle of the rotation shaft 25 of the second drying furnace 20 is 3-10 minutes , The sludge drying apparatus, characterized in that the forward rotation period of the reverse rotation of the rotary shaft 35 of the third drying furnace 30 is operated for 3-10 minutes, 15-30 minutes, respectively. The method of claim 1 Sludge drying apparatus, characterized in that the blade (16, 26, 36) has a pair of blades (16A) spaced a predetermined distance to promote the mixing of the sludge. The method of claim 1 The scraper (17, 27, 37) has a certain angle of inclination with respect to the surface of the inner cylinder so that the sludge is automatically transferred by the angle of the scraper (17, 27 37) by the rotation of the scraper (17, 27, 37) Sludge drying equipment.