JPS6153635B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a rotary dryer with a built-in heating tube, which is employed for drying materials such as resin chips and coal.

Conventional technology As a rotary dryer, "Drying equipment, P136~
As disclosed in P139, February 10, 1981, 12th edition, published by Nikkan Kogyo Shimbun, there are direct heating types, indirect heating types, and indirect direct heating types. Among these, the indirect heating type is a type in which the material is heated indirectly through a metal wall, and hot air or steam is used as the heat medium. For example, a steam-type indirect heating rotary dryer
A large number of steam pipes are arranged along the tilted axis in a cylindrical drying body that is rotatable around the tilted axis, and water vapor is communicated with each steam pipe provided at the lower tilted side of the main body. Steam is allowed to flow into each steam pipe from a steam neck via a manifold, and the desired indirect drying is performed by utilizing the latent heat of phase change when this water vapor condenses within the steam pipe. At this time, the latent heat released and condensed (drain) flows down the slope in the steam pipe and is discharged through the steam neck section.

Problems to be Solved by the Invention According to such a conventional configuration, the water vapor inlet and the drain outlet are the same, so that as a heat medium,
Only phase change materials such as vapor, which change phase from gas to liquid, could be used; other heat carriers could not be used. In addition, since it is not possible to increase the flow rate of water vapor, the heat transfer coefficient cannot be improved, and in order to achieve sufficient drying, a long drying path must be taken, so the length of the dryer is increased. I was getting used to it.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotary dryer with a built-in heating tube that can use a heat medium that does not undergo a phase change and can increase the flow rate of the heat medium.

Means for Solving the Problems In order to solve the above problems, the rotary dryer with a built-in heating tube according to the present invention has an annular header attached to one end of the dryer body, and an annular partition plate provided inside the header. to form a pair of inner and outer annular chambers, and a plurality of radial partition plates with different phases are provided in both the annular chambers to form a plurality of partitioned chambers in the circumferential direction and the same number of chambers, and the adjacent inner A U-shaped heating pipe extending into the dryer main body communicates between the compartment and the outer compartment, and a heat medium supply path is communicated with one of the inner compartments, and the other compartment is opposite to the inner compartment. A heat medium discharge path is communicated with the inner compartment located on the side.

Effects According to the configuration of the present invention, the heat medium supplied from the heat medium supply path to one inner compartment flows into the heating pipe communicating with this inner compartment. After the heating medium flowing in this heating tube turns, it flows into an outer compartment adjoining the inner compartment from the outside and flows out into another heating pipe communicating with this outer compartment. It then flows into another inner compartment adjoining this outer compartment from the inside and circumferentially adjoining the aforementioned one inner compartment. Such a pass flow is performed a plurality of times depending on the number of sections in the circumferential direction, and the heat medium is finally discharged from the inner compartment through the heat medium discharge path.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the drawings. Reference numeral 1 denotes a cylindrical dryer main body, which is supported by a rotary drive device through tires, and is rotatable around an inclined axis. An annular header 2 is attached to one end of the dryer main body 1, and an annular partition plate 3 is provided within the header 2 to define a pair of inner and outer annular chambers 4, 5. Said inner annular chamber 4
Inside, four (plural) radial partition plates 6 are provided at 90 degree intervals to form four (plural) inner compartments 7, 8, 9, 10 in the circumferential direction. Also, four radial partition plates 11 (the same number as the inner annular chamber side) are provided in the outer annular chamber 5 at 90 degree intervals and 45 degrees out of phase with the radial partition plates 6,
Four (plural) outer compartments 12, 13 in the circumferential direction,
14 and 15 are formed. The inner compartment 7 and the adjacent outer compartments 12 and 15 communicate with each other through a U-shaped heating pipe 16, and the outer compartments 12 and 15 and the inner compartments 8 and 10 communicate with each other through a heating pipe 17,
The inner compartments 8 and 10 and the outer compartments 13 and 14 communicate with each other through a heating pipe 18, and the outer compartments 13 and 14 and the inner compartment 9 communicate with each other through a heating pipe 19.
Each heating tube 16, 17, 18, 19 extends into the dryer main body 1, and a plurality of each are arranged. An outer tube 20 is attached to the center core of the header 2,
An inner tube 21 is disposed within the outer tube 20 with a fixed seal member 30 interposed therebetween. The inner end of the inner tube 21 communicates with one inner compartment 7 via a heat medium supply path (pipe) 22, and the inner end of the outer tube 20
It communicates with the inner compartment 9 located on the opposite side via a heat medium discharge path (pipe) 23. A joint pipe 25 is fitted over the outer tube 20 from the middle to the outer end via a plurality of seals/bearings 24, and a heat medium inlet 26 is formed at the outer end of the joint pipe 25. At the same time, a heat medium outlet 27 is formed at the inner end. The heat medium inlet 26 communicates with the inner tube 21 through a communication hole 28 formed at the outer end of the outer tube 20, and the heat medium outlet 27 communicates with the inner tube 21 through a communication hole 29 formed at the middle portion of the outer tube 20. and communicates with the outer tube 20.

The heat medium supplied through the heat medium inlet 26 is
It passes through the inner tube 21 through the communication hole 28 and enters one of the inner compartments 7 through the heat medium supply path 22 . After this, the heating medium enters the outer compartments 12, 15 through the heating pipe 16, into the inner compartments 8, 10 through the heating pipe 17, and into the outer compartments 13, 14 through the heating pipe 18. It then enters the inner compartment 9 through the heating tube 19. In this way, the material to be dried in the dryer main body 1 is dried by flowing (passing) through each of the heating tubes 16, 17, 18, and 19 in sequence. The heat medium taken out to the inner compartment 9 passes through the heat medium discharge path 23 to the outer pipe 20.
The heat medium is then discharged from the heat medium outlet 27 through the communication hole 29 .

Note that when a phase-changeable heat medium is used, for example, water that has condensed in the flow path will gradually move to the heat medium outlet 2 due to the feeding action of the flow of the heat medium.
It will be moved to the 7th side.

Effects of the Invention According to the present invention having the above configuration, by providing the U-shaped heating tube, the heat medium (heat source) can flow without stopping, and the heat medium may be a gas or a liquid with a phase change. Even non-flexible materials can be used, and a wide range of heat carriers can be selected, such as waste hot water, high-temperature exhaust gas, or heat carriers recovered from waste heat. In addition, in general, the heat transfer performance when using a heat medium that does not undergo a phase change is inferior to that when using steam that causes a phase change, but in the present invention, the The number of passes of the heat medium passing through the dryer can be increased by dividing the header part, which is the supply/discharge part of the heat medium (diameter, cylinder length, number of heating tubes), and the flow rate of the heat medium inside the heating tubes. As a result, the length of the dryer can be shortened and the overall size can be made more compact.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional front view of the main part, and FIG. 2 is a cross-sectional view taken in FIG. 1. 1... Dryer main body, 2... Header, 3... Annular partition plate, 4... Inner annular chamber, 5... Outer annular chamber,
6, 11... Radial partition plate, 7, 8, 9, 10
...Inner compartment, 12, 13, 14, 15...Outer compartment, 16, 17, 18, 19...Heating tube, 22
...heat medium supply path, 23...heat medium discharge path.

Claims (1)

[Claims] 1. A rotary dryer having a cylindrical dryer body that is rotatable around an inclined axis, in which an annular header is attached to one end of the dryer body, and an annular partition plate is provided inside the header to separate the inside and outside. A pair of annular chambers are formed into sections, and a plurality of radial partition plates are provided in both annular chambers with different phases, so that a plurality of partitions and the same number of partitions are formed in the circumferential direction, and inner partitions are adjacent inside and outside. A U-shaped heating tube extending into the dryer body communicates between the and the outer compartment, and a heat medium supply path is communicated with one of the inner compartments, and a heat medium supply path is communicated with one of the inner compartments, and a A rotary dryer equipped with a built-in heating tube, characterized in that a heat medium discharge passage is communicated with an inner compartment located in the dryer.