JP5680938B2 - Water-containing organic matter drying equipment - Google Patents

Description

  The present invention relates to a drying apparatus for drying water-containing organic matter such as sludge, raw garbage, and livestock waste.

  As a drying apparatus for drying water-containing organic matter such as sludge, a cylindrical casing (outer cylinder) whose central axis is arranged substantially horizontally, and accommodated in the outer cylinder and substantially parallel to the central axis There is known one having an agitating blade rotating around an axis (hereinafter, sometimes referred to as “agitating blade rotating type drying device” for convenience of explanation) (for example, Patent Documents 1 to 5). ). In the stirring blade rotating type drying apparatus, water-containing organic matter to be dried is introduced into the outer cylinder from the front, and hot air is put into the outer cylinder while stirring the water-containing organic matter in the outer cylinder with the stirring blade. Thus, the water-containing organic matter is dried. Thereby, it is possible to prevent the water-containing organic matter from sticking to the outer cylinder, the stirring blade, or the like. The dried water-containing organic matter is sent to the rear of the outer cylinder by the stirring blade or other delivery means.

  However, in the conventional stirring blade rotating type drying apparatus, it was necessary to dry the entire water-containing organic substance introduced into the outer cylinder while pulverizing with the stirring blade. For this reason, the rotating diameter of the stirring blade must be as large as the inner diameter of the outer cylinder, and the conventional stirring blade rotating type drying apparatus requires a large driving force to rotate the stirring blade. It was a thing. The driving force of the stirring blade needs to be increased as the viscosity of the water-containing organic matter such as sewage sludge and livestock dung becomes higher. However, in the conventional stirring blade rotating type drying apparatus, the water-containing organic matter introduced into the outer cylinder from the front may fall into a large lump while maintaining the viscosity, There was also a risk of staying on the inner bottom surface near the front end in the outer cylinder. For this reason, problems such as the stirring blades not rotating easily occur.

Japanese Patent Laid-Open No. 08-010989 JP 09-001197 A JP-A-10-148471 JP 2007-136348 A JP 2008-173551 A

  The present invention has been made in order to solve the above problems, and prevents the water-containing organic material just put into the outer cylinder from dropping and sticking to the vicinity of the front end in the outer cylinder. It is an object of the present invention to provide a water-containing organic matter drying apparatus that can suppress the occurrence of problems such as no longer rotating and can efficiently dry water-containing organic matter. Another object of the present invention is to provide a water-containing organic matter drying device capable of reducing the rotational driving force of a stirring blade or the like as compared with a conventional stirring blade rotating type drying device.

  The above-described problems include an outer cylinder whose central axis is directed in the front-rear direction, an inner cylinder accommodated in the outer cylinder and disposed along the central axis of the outer cylinder, and from the front of the outer cylinder to the outer cylinder. Water-containing organic matter supplying means for supplying water-containing organic matter and dropping the water-containing organic matter onto the outer peripheral surface of the inner cylinder, inner cylinder heating means for heating the inner cylinder, and inner cylinder rotating means for rotating the inner cylinder around its central axis At least a pair of pressing rollers for pressing the water-containing organic matter from both sides before being supplied into the outer cylinder and falling onto the outer peripheral surface of the inner cylinder; and a pressing roller rotating means for rotating each pressing roller around its central axis The water-containing organic substance supplied into the outer cylinder by the water-containing organic substance supply means is formed into a plate shape with a pressing roller and then dropped onto the outer peripheral surface of the inner cylinder, and the water-containing organic substance is heated while being heated by the inner cylinder. It is possible to transfer to the rear of the cylinder It is solved by providing a drying device of the hydrous organic matter.

  In this way, the water-containing organic substance supplied into the outer cylinder is formed into a plate shape with a pressing roller and then dropped into the inner cylinder below it to heat, thereby increasing the surface area of the water-containing organic substance. It is possible to easily evaporate the water on the surface and prevent the water-containing organic matter from sticking to each part of the drying apparatus. For this reason, it is also possible to reliably transfer the water-containing organic matter backward in the outer cylinder so that the water-containing organic matter does not hinder the rotation of the stirring blade described later. Therefore, it is possible to suppress the driving force required for the rotation of the stirring blade described later. If the moisture content of at least the surface of the water-containing organic substance can be reduced to about 50 to 60% at the initial stage of the input of the drying apparatus, sticking of the water-containing organic substance can be prevented.

  In the water-containing organic matter drying apparatus of the present invention, the inner cylinder heating means is not particularly limited as long as it can heat the inner cylinder. However, it is preferable that the inner cylinder heating means be hot air generating means for sending hot air from the rear of the inner cylinder into the inner cylinder. Thereby, it becomes possible to heat the whole inner cylinder efficiently. At this time, it is preferable to provide a plurality of vent holes in the peripheral wall of the inner cylinder so as to communicate the peripheral wall inward and outward so that the hot air sent into the inner cylinder by the hot air generating means escapes to the outside of the inner cylinder through the communication hole. Thereby, the water-containing organic substance supplied into the outer cylinder is not only directly baked by the inner cylinder, but also heated by hot air (hot air) that has flowed out of the inner cylinder through the communication hole. It is also possible to further stir the hydrated organic substance supplied into the outer cylinder with hot air. Therefore, it becomes possible to dry a water-containing organic substance more efficiently.

  Further, in the water-containing organic matter drying apparatus of the present invention, the pressing roller does not need to be heated in particular, but in order to more reliably prevent the water-containing organic matter from re-adhering and more efficiently dry the water-containing organic matter. As with the inner cylinder, it is preferable to heat the pressure roller. In this case, the pressure roller may be heated using the inner cylinder heating means, but it is preferable to provide the pressure roller heating means for heating the pressure roller independently from the inner cylinder heating means. Thereby, it becomes possible to heat the water-containing organic material just supplied into the outer cylinder at a higher temperature with the pressing roller, and it becomes possible to dry the water-containing organic material more efficiently.

  Further, in the water-containing organic matter drying apparatus of the present invention, an outer cylinder rotating means for rotating the outer cylinder around its central axis is provided, and the organic water that has fallen from the outer peripheral surface of the inner cylinder is lifted up to the upper part in the outer cylinder. It is also preferable to provide a stirring blade for inward from the inner peripheral surface of the outer cylinder. Thus, by rotating the outer cylinder itself, it is possible not only to stir the water-containing organic substance more efficiently but also more reliably prevent the water-containing organic substance from staying in the vicinity of the front end portion in the outer cylinder.

  As described above, according to the present invention, it is possible to prevent the water-containing organic material just put into the outer cylinder from dropping and sticking to the vicinity of the front end in the outer cylinder, thereby causing the occurrence of problems such as the stirring blade not rotating. Therefore, it is possible to provide a water-containing organic matter drying apparatus that can efficiently dry the water-containing organic matter. It is also possible to provide a water-containing organic matter drying device capable of reducing the rotational driving force of the stirring blade or the like as compared with a conventional stirring blade rotating type drying device.

It is sectional drawing which showed the state which cut | disconnected the drying apparatus of the water-containing organic substance of this invention by the vertical plane containing the central axis of an outer cylinder. It is sectional drawing which showed the state which cut | disconnected the outer cylinder in the drying apparatus of the water-containing organic substance of this invention by the perpendicular surface (AA surface in FIG. 1) perpendicular | vertical to the central axis.

0. Outline of Hydrous Organic Drying Apparatus A preferred embodiment of the hydrous organic drying apparatus of the present invention will be described more specifically with reference to the drawings. FIG. 1 is a cross-sectional view showing a state in which the water-containing organic matter drying apparatus of the present invention is cut along a vertical plane including the central axis of the outer cylinder 10. FIG. 2 is a cross-sectional view showing a state in which the outer cylinder 10 in the water-containing organic matter drying apparatus of the present invention is cut along a vertical plane (A-A plane in FIG. 1) perpendicular to the central axis.

  As shown in FIG. 1, the water-containing organic matter drying apparatus of the present embodiment includes an outer cylinder 10 whose central axis is directed in the front-rear direction, and an outer cylinder rotating unit 20 that rotates the outer cylinder 10 around the central axis. The inner cylinder 30 accommodated in the outer cylinder 10 and arranged along the central axis of the outer cylinder 10, the water-containing organic substance is supplied from the front of the outer cylinder 10 into the outer cylinder 10, and the water-containing organic substance is supplied to the inner cylinder 30. Water-containing organic substance supplying means 40 for dropping onto the outer peripheral surface of the inner cylinder, inner cylinder heating means 50 for heating the inner cylinder 30, inner cylinder rotating means 60 for rotating the inner cylinder 30 about its central axis, and into the outer cylinder 10 At least a pair of pressing rollers 70 that press the water-containing organic matter before being dropped onto the outer peripheral surface of the inner cylinder 30 from both sides, a pressing roller heating means 80 that heats the pressing rollers 70, and each pressing roller 70 are Rotating pressure roller that rotates around the central axis It has become a thing that includes a stage 90. In this water-containing organic matter drying apparatus, the water-containing organic material supplied into the outer cylinder 10 by the water-containing organic material supply means 40 is formed into a plate shape by the pressing roller 70 and then falls onto the outer peripheral surface of the inner cylinder 30, It is transferred to the rear of the outer cylinder 10 while being heated by the cylinder 30.

1. Outer cylinder In the water-containing organic matter drying apparatus of the present embodiment, the outer cylinder 10 has a substantially cylindrical shape, and its central axis is horizontal as shown in FIG. The central axis may be inclined from the horizontal. In this case, it is preferable that the front end side of the outer cylinder 10 to which the water-containing organic substance is supplied be higher than the rear end side of the outer cylinder 10 to which the water-containing organic substance is delivered. Thereby, the water-containing organic substance supplied to the outer cylinder 10 can be more easily transferred backward in the outer cylinder 10, and the water-containing organic substance can be further prevented from staying at a predetermined location in the outer cylinder 10. When the central axis of the outer cylinder 10 is inclined, the inclination angle is not particularly limited. However, if the inclination angle of the outer cylinder 10 is too small, there is no point in inclining the outer cylinder 10, and if the inclination angle of the outer cylinder 10 is too large, the water-containing organic substance introduced into the front end portion in the outer cylinder 10 May slide down to the rear end of the outer cylinder 10. For this reason, when the outer cylinder 10 is inclined, the inclination angle of the outer cylinder 10 is normally 1 to 50 °, preferably 3 to 40 °, and more preferably 5 to 30 °.

  Further, in the water-containing organic matter drying apparatus of the present embodiment, a stirring blade 11 is provided inward on the inner peripheral surface of the outer cylinder 10 as shown in FIGS. 1 and 2. With the stirring blade 11, the water-containing organic matter that has fallen from the outer peripheral surface of the inner cylinder 30 to the inner peripheral surface of the outer cylinder 10 can be raked up again in the upper part of the outer cylinder 10. In the water-containing organic matter drying apparatus of this embodiment, as shown in FIG. 2, four stirring blades 11 are provided so as to be rotationally symmetrical with respect to the central axis of the outer cylinder 10. As shown in FIG. 1, each stirring blade 11 extends in the central axis direction of the outer cylinder 10 while continuously changing the position in the circumferential direction of the inner peripheral surface of the outer cylinder 10, and as a whole has a spiral shape. I'm doing it. For this reason, when the outer cylinder 10 is rotated around its central axis, the respective stirring blades 11 are also rotated integrally with the outer cylinder 10, and the water-containing organic matter is combined with the stirring blades 31 described later. It can be sent backwards. The number and dimensions of the stirring blades 11 and the stirring blades 31 are appropriately determined so that the filling rate described later can be maintained.

(Radius of the inner peripheral surface excluding the stirring blade 11. Hereinafter, the inner radius R _1.) Inner radius of the outer cylinder 10, such as the dimensions of the outer cylinder 10, in consideration of drying the effective volume of the outer cylinder 10 Determine as appropriate. The calculation method of the dry effective volume of the outer cylinder 10 is as follows.

The weight of water to be evaporated, where W ₁ [kg / h] is the supply weight of water-containing organic matter per hour, α is the water content of the water-containing organic material before drying, and β is the water content of the water-containing organic material after drying. W ₂ [kg / h] is represented by the following formula 1.

W ₂ = {(α−β) / (1-β)} × W ₁ Formula 1

Also, if the latent heat of vaporization of water is X ₁ [kcal / kg], the specific heat of water vapor is c ₁ [kcal / kg ° C.], and the temperature of the non-aqueous component (dry component) in the water-containing organic matter is T [° C.] The latent heat of vaporization Q ₁ [kcal / h] necessary for evaporating water of W ₂ [kg / h] is expressed by the following formula 2.

Q ₁ = W ₂ × (X ₁ + c ₁ × T) Equation 2

Further, assuming that the latent heat of vaporization is X ₂ [kcal / kg], the amount of heat carried out Q ₂ [kcal / h] of the dry component of the water-containing organic material is expressed by the following formula 3.

Q ₂ = (W ₁ −W ₂ ) × X ₂ Formula 3

Furthermore, the amount of heat Q ₃ [kcal / h] required per hour is expressed by the following formula 4.

Q ₃ = Q ₁ + Q ₂ ... Formula 4

When the logarithmic average temperature difference of the outer cylinder 10 is ΔT [° C.], it is necessary to set the heat capacity coefficient representing the “water evaporation capacity in the unit effective volume of the drying apparatus” to C [kcal / m ³ h ° C.]. The dry effective volume V ₁ [m ³ ] of the outer cylinder 10 can be obtained by the following formula 5.

V ₁ = (Q ₃ / ΔT) / C Equation 5

The heat capacity coefficient C in Equation 5 needs to be set as large as possible, and is generally set to about 150 [kcal / m ³ h ° C.].

Specifically, when the supply weight W ₁ is 4,000 [kg / h], the water content α is 0.8, and the water content β is 0.3, the weight W ₂ is 2 857 [kg / h]. Further, when the latent heat of vaporization X ₁ is 540 [kcal / kg], the specific heat c ₁ is 0.47 [kcal / kg ° C.], and the temperature T is 100 [° C.], the latent heat of vaporization Q ₁ is 1,677,059 [kcal / h]. Furthermore, assuming that X ₂ is 100 [kcal / kg], the heat quantity Q ₂ is obtained as 114,300 [kcal / h] from the above equation 3. Therefore, the amount of heat _{Q 2} are the above equation 4 is obtained as 114,300 [kcal / h]. When the logarithmic average temperature difference ΔT is 350 [° C.] and the heat capacity coefficient C is 150 [kcal / m ³ h ° C.], the dry effective volume V ₁ is calculated as 34 [m ³ ] from the above equation 5. . Therefore, if the axial length of the outer cylinder 10 is 11 m under such conditions, the inner radius R ₁ of the outer cylinder may be about ₁ m if the volume of the inner cylinder 30 is ignored. .

By the way, assuming that the residence time of the water-containing organic substance in the outer cylinder 10 is 40 minutes under the conditions specifically calculated in the above paragraph, the filling rate (the volume V of the water-containing organic substance occupying the dry effective volume V ₁ of the outer cylinder 10). ₂ ) is 17.6%. If the filling rate is increased too much, the water-containing organic matter may not be efficiently dried in the outer cylinder 10, so that the filling rate is usually 30% or less. The filling rate is preferably 25% or less, and more preferably 20% or less. On the other hand, if the filling rate is too small, the dimensions of the outer cylinder 10 become unnecessarily large. For this reason, the filling rate is usually 5% or more, preferably 10% or more.

2. Outer cylinder rotating means The outer cylinder rotating means 20 is not particularly limited as long as it can rotate the outer cylinder 10 around its central axis. As the outer cylinder rotating means 20, a motor is usually employed. The outer cylinder rotating means 20 may be configured to directly rotate the central axis (rotating shaft) of the outer cylinder 10, or may be configured to rotate indirectly using a mechanism such as a belt or a chain. May be. The direction in which the outer cylinder 10 is rotated is set to a direction in which the water-containing organic matter can be easily stirred and transferred to the rear according to the direction of the stirring blade 11 and the direction of rotation of the inner cylinder 30. In the method for producing a water-containing organic material of this embodiment, the outer cylinder 10 is rotated in the direction of the arrow a shown in FIG. 2, and the tip of the stirring blade 11 is rotated in an inclined direction. Thereby, the water-containing organic substance can be efficiently stirred by the stirring blade 11. The rotational speed of the outer cylinder 10 is appropriately determined so that the above-described filling rate can be maintained.

3. Inner cylinder In the water-containing organic matter drying apparatus of the present embodiment, the inner cylinder 30 has a substantially cylindrical shape, and penetrates from the front end portion to the rear end portion of the outer cylinder 10 as shown in FIG. Provided. The central axis of the inner cylinder 30 is not necessarily coincident with the central axis of the outer cylinder 10, but in the hydrated organic matter drying apparatus of this embodiment, both central axes (rotating axes) are coincident. The peripheral wall of the inner cylinder 30 is provided with a plurality of vent holes 32 that communicate with the inner and outer walls in a slit shape, and the hot air sent into the inner cylinder 30 by the hot air generating means (inner cylinder heating means 50) communicates. Through the hole 32, the outer cylinder 30 is pulled out. Thereby, it becomes possible to dry a water-containing organic substance more efficiently.

  Further, in the water-containing organic matter drying apparatus of the present embodiment, a stirring blade 31 is provided outward on the outer peripheral surface of the inner cylinder 30 as shown in FIGS. The agitation blade 31 can agitate the water-containing organic matter that has dropped from the inner surface of the pressing roller 70 or the outer cylinder 10 onto the outer surface of the inner cylinder 30. In the water-containing organic matter drying apparatus of this embodiment, as shown in FIG. 2, six stirring blades 31 are provided so as to be rotationally symmetric with respect to the central axis of the inner cylinder 30. As shown in FIG. 1, each stirring blade 31 extends in the central axis direction of the inner cylinder 30 while continuously changing the position in the circumferential direction of the outer peripheral surface of the inner cylinder 30, and has a spiral shape as a whole. doing. For this reason, when the inner cylinder 30 is rotated about its central axis, each stirring blade 31 is also rotated integrally with the inner cylinder 30, and the water-containing organic matter is moved backward together with the stirring blade 11. Can be sent.

Outer radius of the inner cylinder 30 (the radius of the outer circumferential surface excluding the stirring blade 31. Hereinafter, the outer radius R _2.) Is not particularly limited. However, when an outer radius R ₂ of the inner tube 30 is too small, the time hydrated organic material is formed into a plate shape by a pair of pressing rollers 70 is burned on the inner cylinder 30 becomes shorter. On the other hand, if the outer radius R ₂ of the inner cylinder 30 is too large, there is a possibility that a large effective drying volume V ₁ of the outer cylinder 10 cannot be secured. In addition, a space (a gap between the inner peripheral surface of the outer cylinder 10 and the outer peripheral surface of the inner cylinder 30) in which the hydrated organic substance moves cannot be secured, and the hydrated organic substance may be easily clogged in the outer cylinder 10. Moreover, there is a possibility that it is difficult to provide the stirring blade 11 and the stirring blade 31. For this reason, the ratio R ₂ / R ₁ of the outer radius R ₂ of the inner cylinder 30 to the inner radius R ₁ of the outer cylinder 10 is usually 0.03 to 0.9, preferably 0.5 to 0.7, More preferably, it is 0.1-0.5.

4). Water-containing organic substance supply means The water-containing organic substance supply means 40 is not particularly limited as long as it can supply the water-containing organic substance to the front end portion of the outer cylinder 10. In the water-containing organic matter drying apparatus according to the present embodiment, the water-containing organic matter supplying means 40, as shown in FIG. A screw cylinder 42 and a cylindrical casing 43 for accommodating the screw cylinder 42 are employed. By rotating the screw cylinder 42 about its central axis, the water-containing organic matter moves backward in the casing 43. The screw cylinder 43 is rotated by a screw cylinder rotating means 44. The rear end portions of the screw cylinder 42 and the casing 43 in the water-containing organic substance supply means 40 are inserted into the upper portion in the vicinity of the front end portion in the outer cylinder 10. For this reason, the water-containing organic matter is supplied from the upper part in the vicinity of the front end in the outer cylinder 10 into the outer cylinder 10.

5. Inner cylinder heating means The inner cylinder heating means 50 is not particularly limited as long as it can heat the inner cylinder 30. In the water-containing organic matter drying apparatus of this embodiment, the inner cylinder heating means 50 is hot air generating means for sending hot air from the rear of the inner cylinder 30 into the inner cylinder 30. As the hot air generating means, a burner (not shown) and a blower (not shown) for sending the flame generated by the burner forward are used. In the water-containing organic matter drying apparatus of the present embodiment, the hot air generated by the inner cylinder heating means 50 passes through the inner cylinder 30 from the rear to the front, as indicated by an arrow c in FIG.

6). Inner cylinder rotating means The inner cylinder rotating means 60 is not particularly limited as long as it can rotate the inner cylinder 30 about its central axis. As the inner cylinder rotating means 60, a motor is usually employed. The inner cylinder rotating means 60 may be configured to directly rotate the central axis (rotating shaft) of the inner cylinder 30, or may be configured to rotate indirectly using a mechanism such as a belt or a chain. May be. The direction in which the inner cylinder 30 is rotated is set to a direction in which the water-containing organic matter is easily stirred and transported backward according to the direction of the stirring blade 31 and the direction of rotation of the outer cylinder 10. In the water-containing organic matter drying apparatus of the present embodiment, the inner cylinder 30 is rotated in the direction of the arrow b shown in FIG. 2, and coincides with the direction of rotation of the outer cylinder 10. The rotational speed of the inner cylinder 30 is appropriately determined in consideration of the above-described filling rate and the like. When the rotation speed of the inner cylinder 30 and the rotation speed of the outer cylinder 10 are the same, the inner cylinder 30 and the outer cylinder 10 may be connected by a connecting body such as a spoke so as to rotate integrally. it can. In this case, if the outer cylinder 10 is rotated, the inner cylinder 30 is also rotated. Therefore, it is not necessary to separately provide the inner cylinder rotating means 60, the water-containing organic matter drying apparatus is simplified, and the manufacturing cost thereof is reduced. Can be reduced.

7). Pressing roller The pressing roller 70 is not particularly limited as long as it can press the water-containing organic material supplied from the upper part in the vicinity of the front end portion of the outer cylinder 10 from both sides to be formed into a plate shape. In the water-containing organic matter drying apparatus of this embodiment, as shown in FIG. 2, a pair of pressing rollers 70 arranged in parallel at a predetermined interval are provided so that the central axes thereof are parallel to each other. Each pressing roller 70 has a hollow cylindrical shape, in which hot air can be introduced, and the pressing roller 70 itself is also heated. Thus, even when the water-containing organic material is formed into a plate shape by the pressing roller 70, the water-containing organic material is baked by the pressure roller 70 to evaporate the water on the surface, and the water-containing organic material can be dried more efficiently. . In the water-containing organic matter drying apparatus according to this embodiment, the central axis of the pressing roller 70 is parallel to the central axes of the outer cylinder 10 and the inner cylinder 30, but is not necessarily parallel.

The outer radius (referred to as outer radius R ₃ ) of the pressing roller 70 is not particularly limited, and varies depending on the type and characteristics of the water-containing organic material to be dried or the scale of the drying device (the amount of water-containing organic material processed). However, too small an outer radius R ₃ of the pressing roller 70, not only the water organic matter supplied to the outer cylinder 10 from the water-containing organic substance supply unit 40 is not easily introduced into the gap of the pair of pressing rollers 70, pressing The water-containing organic material cannot be sufficiently heated by the roller 70, and the drying efficiency of the water-containing organic material may be reduced. Because the outer radius R ₃ of the pressing roller 70 is small, if a faster rotational speed of the pressing roller 70, but can not be smoothly processed hydrous organic matter supplied to the outer tube 10, in this case , The rotation period of the pressure roller 70 is shortened, and the time taken until the portion of the pressure roller 70 that has been deprived of heat by the water-containing organic material is rotated once to press the water-containing organic material again is shortened. This is because is not heated to the original temperature. Therefore, it is preferable that the outer radius R ₃ of the pressing roller 70 be as large as possible within a range in which the pressing roller 70 can be accommodated between the inner peripheral surface of the outer cylinder 10 and the outer peripheral surface of the inner cylinder 30. Such outer radius R _3, for dimensions conditions of the pressure roller 70, also described in describing the rotational speed of the pressing roller 70 later.

  The distance between the pair of pressing rollers 70 (minimum value of the gap formed by the outer peripheral surfaces) varies depending on the type and characteristics of the water-containing organic matter to be dried, the scale of the drying device (the amount of water-containing organic matter processed), and the like. There is no particular limitation. However, if the distance between the pair of pressing rollers 70 is too narrow, the water-containing organic matter may stay above the pressing rollers 70 and become clogged. For this reason, the space | interval of a pair of press roller 70 shall be 0.5 mm or more normally. The distance between the pair of pressing rollers 70 is preferably 1 mm or more. On the other hand, if the distance between the pair of pressure rollers 70 is too wide, the water-containing organic material cannot be formed into a thin plate by the pressure roller 70, and the drying efficiency of the water-containing organic material may be reduced. For this reason, the distance between the pair of pressing rollers 70 is usually 10 mm or less. The distance between the pair of pressing rollers 70 is preferably 5 mm or less, and more preferably 3 mm or less.

  By the way, in the water-containing organic matter drying apparatus of this embodiment, only one pair of pressing rollers 70 is provided, but a plurality of pairs of pressing rollers 70 may be provided. In this case, it is preferable that a certain pair of pressing rollers 70 is disposed directly below the other pair of pressing rollers 70, and the interval between the pair of pressing rollers 70 disposed in the lower stage is equal to that of the pair of pressing rollers 70 disposed in the upper stage. It is preferable to make it narrower than the interval. Accordingly, even when the water-containing organic material is supplied in a lump shape, the water-containing organic material can be formed into a plate shape step by step. At this time, the rotational speed of the pair of pressing rollers 70 arranged in the lower stage is set to be higher than the rotational speed of the pair of pressing rollers 70 arranged in the upper stage, so that water is contained on the pressing roller 70 arranged in the lower stage. It is possible to prevent the organic matter from staying.

8). Pressing roller heating means The pressing roller heating means 80 is not particularly limited as long as it can heat the pressing roller 70. In the water-containing organic matter drying apparatus of this embodiment, the pressing roller heating means 80 uses hot air generating means similar to the inner cylinder heating means 50 and covers the front end of the outer cylinder 10 as shown in FIG. By sending hot air (arrow d in FIG. 1) into the front duct 100 provided in this manner, the hot air passes from the front to the back through the pressing roller 70 disposed in the vicinity of the front end portion in the outer cylinder 10. . The front duct 10 has not only hot air from the pressing roller heating means 80 but also a function of folding back hot air that has passed through the inner cylinder 30 from the rear to the front by the inner cylinder heating means 50 and introducing it into the outer cylinder 10. It has become. The hot air sent from the pressure roller heating means 80 and passed through the pressure roller 70 rearward, and the hot air sent from the inner cylinder heating means 50 and introduced into the outer cylinder 10 are as shown by an arrow e in FIG. As shown by an arrow f in FIG. 1, it passes through the outer cylinder 10 from the front to the rear, passes through a rear duct 110 provided so as to cover the rear end portion of the outer cylinder 10, and is discharged to the outside air or not shown. It is sent to the dry exhaust gas treatment device.

9. Pressing roller rotating means The pressing roller rotating means 90 is not particularly limited as long as it can rotate the pressing roller 70 around its central axis. As the pressing roller rotating means 90, a motor is usually employed. The pressing roller rotating means 90 may be configured to directly rotate the central axis (rotating shaft) of the pressing roller 70, or may be configured to rotate indirectly using a mechanism such as a belt or a chain. May be. As shown by the arrow g in FIG. 2, the pressing roller 70 is formed from above on the paired pressing roller 70 side so that the water-containing organic material supplied from the water-containing organic material supplying means 40 into the outer cylinder 10 can be formed into a plate shape. It is rotated in the direction of rotating downward. The rotational speed of the pressure roller 70 is not particularly limited, but the rotational speed of the pressure roller 70 is X [rpm], the treatment amount of the water-containing organic matter is V [m ³ / h], and the interval between the pressure rollers 70 is T [mm]. The effective length of the pressing roller 70 (the length of the section acting to form the water-containing organic matter in the entire axial length of the pressing roller 70) is L [cm], and the outer radius of the pressing roller 70 is R ₃ [ cm], it is preferable to set the value represented by the following formula 1.
X = V × 10 ⁶ ÷ (6 × L × R ₃ × T) Equation 1
Thereby, it becomes possible to process the water-containing organic substance supplied from the water-containing organic substance supply means 40 without delay.

10. Method for Drying Water-Containing Organic Material A method for drying a water-containing organic material using the water-containing organic material drying apparatus of this embodiment will be described. As shown in FIG. 1, the water-containing organic substance is put into a hopper 41 in the water-containing organic substance supply means 40. The water-containing organic substance thrown into the hopper 41 moves downward in the hopper 41 and is introduced to the front side of the casing 43 below the hopper 41. The water-containing organic substance introduced into the casing 43 is pushed backward by the screw cylinder 42 and supplied into the outer cylinder 10 from the upper part in the vicinity of the front end portion in the outer cylinder 10.

  The water-containing organic substance supplied into the outer cylinder 10 is formed into a plate shape by pressing both sides thereof by a pair of pressing rollers 70 and falls onto the outer peripheral surface of the inner cylinder 10. At this time, since the water-containing organic material is baked by the pressing roller 70, a part of the water contained therein evaporates. The water-containing organic matter that has dropped onto the inner cylinder 10 rotates with the inner cylinder 30 while being baked by the heated inner cylinder 30. At this time, most of the moisture contained in the water-containing organic material evaporates and becomes granular. The water-containing organic matter adhered to the inner cylinder 30 falls to the upward inner peripheral surface of the outer cylinder 10 (the inner bottom surface of the outer cylinder 10) by gravity when the inner cylinder 30 rotates about a half circumference.

  The water-containing organic matter that has fallen to the inner bottom surface of the outer cylinder 10 is scraped upward in the outer cylinder 10 by the rotation of the outer cylinder 10 and falls again onto the inner cylinder 10. At this time, the water-containing organic matter moves backward in the outer cylinder 10 by hot air passing from the front to the rear in the stirring blade 11, the stirring blade 31, or the outer cylinder 10. As the water-containing organic substance moves rearward in the outer cylinder 10, it is further dried by hot air passing through the outer cylinder 10, heat of the inner cylinder 30, etc., and becomes fine or powdery. The water-containing organic matter that has reached the rear end of the outer cylinder 10 is in a completely dry state. The dried hydrated organic matter falls into the hydrated organic matter delivery pipe 120 provided at the lower portion of the rear duct 110 as indicated by an arrow h shown in FIG. 1, and is taken out of the drying apparatus. The extracted water-containing organic matter (dry matter) can be reused as a raw material for fertilizers and the like.

11. Use The use of the water-containing organic matter drying apparatus of the present invention is not limited, and can be used to dry various kinds of water-containing organic matter. Examples of the water-containing organic material that can be suitably dried by the water-containing organic material drying apparatus of the present invention include sludge, raw garbage, and livestock waste. By using the water-containing organic matter drying apparatus of the present invention, these water-containing organic materials can be easily reused as effective resources (for example, fertilizer and fuel).

DESCRIPTION OF SYMBOLS 10 Outer cylinder 11 Stirring blade 20 Outer cylinder rotating means 30 Inner cylinder 31 Stirring blade 32 Communication hole 40 Hydrous organic substance supply means 41 Hopper 42 Screw cylinder 43 Casing 44 Screw cylinder rotating means 50 Inner cylinder heating means 60 Inner cylinder rotating means 70 Press roller 80 Pressure roller heating means 90 Pressure roller rotation means 100 Front duct 110 Rear duct 120 Hydrous organic matter delivery pipe

Claims (5)

An outer cylinder whose center axis is directed in the front-rear direction and rotates about the center axis ;
An inner cylinder housed in the outer cylinder and arranged along the central axis of the outer cylinder, and rotating around the central axis ;
Water-containing organic matter supplying means for supplying water-containing organic matter into the outer cylinder from a supply section provided in front of the outer cylinder, and dropping the water-containing organic matter onto the outer peripheral surface of the inner cylinder;
An inner cylinder heating means for heating the inner cylinder ;
At least a pair of pressing rollers that press the water-containing organic matter from both sides before being supplied into the outer cylinder and falling onto the outer peripheral surface of the inner cylinder;
A pressing roller rotating means for rotating each pressing roller around its central axis;
With
The first stirring blade for stirring the water-containing organic material formed into a plate shape by the pressing roller is provided outward from the outer peripheral surface of the inner cylinder,
A second agitating blade is provided inward from the inner peripheral surface of the outer cylinder, for lifting the water-containing organic matter falling from the outer peripheral surface of the inner cylinder to the upper part in the outer cylinder;
A pair of pressing rollers is disposed immediately below the supply portion of the water-containing organic substance supply means, and directly above the inner cylinder,
The hydrous organic substance supplied from the supply part of the hydrous organic substance supply means into the outer cylinder is formed into a plate shape by a pressing roller, then dropped onto the outer peripheral surface of the inner cylinder, and the outer cylinder is heated while the hydrous organic substance is heated by the inner cylinder A device for drying a water-containing organic material, characterized in that it can be transported to the rear of the water.   The apparatus for drying a water-containing organic substance according to claim 1, wherein the inner cylinder heating means is hot air generating means for sending hot air from the rear of the inner cylinder into the inner cylinder.   The water content according to claim 2, wherein a plurality of ventilation holes are provided in the peripheral wall of the inner cylinder so as to communicate the inner wall with the outer wall, and the hot air sent into the inner cylinder by the hot air generating means escapes outside the inner cylinder through the communication hole. Organic matter drying equipment.   The water-containing organic matter drying apparatus according to any one of claims 1 to 3, wherein a pressing roller heating means for heating the pressing roller is provided independently of the inner cylinder heating means. A plurality of pairs of pressure rollers are provided, one pair of pressure rollers is disposed directly below the other pair of pressure rollers, and the distance between the pair of pressure rollers disposed on the lower stage is disposed on the upper stage. The water-containing organic matter drying device according to any one of claims 1 to 4, wherein the drying device is narrower than a distance between the pair of pressing rollers.

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