JPS6127939Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an air supply and exhaust system for a multi-stage fermenter.

Conventionally, when performing aerobic fermentation treatment of sludge, municipal waste, livestock manure, etc. generated from sewage treatment plants and human waste treatment plants, these sludges have a high water content and cannot be fermented as they are. Either pre-drying or adding and mixing additives such as rice husks, rice straw, sawdust, and bark, as well as a part of the product compost, adjust the moisture content, and shape it into a shape suitable for aerobic fermentation. The material to be fermented is introduced from the top of the multi-stage fermenter. Then, while supplying and exhausting air in the fermentation tank, the fermented material is transferred from the upper stage of each tank to the lower stage, that is, from the uppermost fermentation shelf, it is sequentially dropped to the lower fermentation shelf by opening and closing the shelves. , fermentation processing is carried out.

This type of vertical multi-stage fermenter conventionally has an air supply device that blows out air from inside a hollow shelf floor in order to smoothly supply air into the fermenter. There is (for example, 1986-
66300). This multi-stage fermenter consists of 1st and 2nd fermenter.
As shown in the figure, a plurality of shelf boards 3 constituting each shelf 2 of a multi-stage fermenter 1 are made hollow, and a large number of air supply holes 4 are bored in the upper surface of the shelf boards 3. Air is supplied from the inside of the attached hollow rotating shaft 5 through the air supply hole 6 and is blown out from the upper surface of the shelf board 3. In FIG. 1, 7 is an exhaust port provided on the wall of the fermenter 1, 8 is a fermented material supply conveyor, 9 is an input port, 10 is a discharge conveyor, and 11
is the outlet. However, in this conventional multi-stage fermenter, exhaust air is carried out through the exhaust port 7 provided in the tank wall, which makes it difficult for air to pass uniformly in the height direction of the fermented materials loaded on the shelf floor 2. Furthermore, the method has the disadvantage that exhaust gas accumulates and condenses on the surface of the fermented product, preventing uniform fermentation.

This invention eliminates the drawbacks of the conventional methods described above, and allows air to be ventilated uniformly in the height direction of each shelf by exhausting air from the bottom of each shelf, thereby achieving uniform aerobic fermentation. The object of the present invention is to provide an air supply and exhaust device for a multi-stage fermenter that can perform the following steps.

This invention will be explained below based on embodiments shown in the drawings.

In FIGS. 3 and 4, a hollow rotating shaft 12
are cut in half and fixed to opposite positions on the upper and lower surfaces of one side edge of the shelf board 13, and an upper passage 14 is formed between the upper inner circumferential surface of the rotating shaft 12 and the upper surface of the shelf board 13. However, a lower passage 15 is formed between the lower inner peripheral surface of the rotating shaft 12 and the lower surface of the shelf board 13. The upper passage 14 and the lower passage 15 are closed at one end (lower side in FIG. 3), and at the other end (upper side in FIG. 3), the upper passage 14 is connected to an air supply pipe (not shown) in the lower passage. 15 is connected to the exhaust pipe.

A semi-cylindrical cylinder 16 is mounted on the upper surface of the shelf board 13 so that its longitudinal direction is perpendicular to the axis of the rotating shaft 12 and
Multiple pieces along the axis of 2 (5 pieces in the drawing)
They are arranged in parallel and are attached, the front end side is closed, the rear end side is fixed to the peripheral wall of the rotating shaft 12, and an air supply passage 17 is formed inside. These air supply passages 17 are connected to the upper passage 14 by first air supply holes 18 formed in the peripheral wall of the rotating shaft 12, respectively.
It is communicated with.

A plurality of second air holes 19 (four in the drawing) are bored in the upper part of each semi-cylinder 16 along the longitudinal direction to communicate the air passage 17 with the outside.

A plurality of semicylindrical cylinders 20 (in the drawing, four semicylindrical cylinders 20 are arranged on the lower surface of the shelf board 13 so that the longitudinal direction thereof is perpendicular to the axis of the rotating shaft 12 and along the axis of the rotating shaft 12
They are arranged in parallel and are attached, the front end side being closed, and the rear end side being fixed to the peripheral wall of the rotating shaft 12, and an exhaust passage 21 is formed inside. These exhaust passages 21 are communicated with each other through a first exhaust hole 22 bored in the peripheral wall of the rotating shaft 12, and a second exhaust hole 22 is provided in the upper part of the semi-cylindrical cylinder 20, which communicates the exhaust passage 21 with the outside. A plurality of exhaust holes 23 (four in the drawing) are bored along the longitudinal direction.

Both ends of the rotating shaft 12 of the shelf board 13 are horizontally supported by the outer walls 24 on both sides of the fermenter, so that the shelf board 13 can freely swing between a horizontal position and a downward position in a vertical plane. A plurality of shelf boards 13 are arranged horizontally in parallel to constitute each shelf of the multi-stage fermenter.

The air supply and exhaust system is configured such that each shelf board 13 is kept horizontally, and the air is supplied to the air supply pipe.
Upper passage 14 - first air supply hole 18 - air supply passage 17 -
The air is blown out upwardly from each shelf board 13 through the second air supply hole 19 . Then, this blown air flows from the bottom surface of the other shelf board 13 constituting the shelf directly above the second shelf board 13.
The air is exhausted through the exhaust hole 23 - exhaust passage 21 - first exhaust hole 22 - lower passage 15 - exhaust pipe.

5 to 8 show other embodiments of this invention. In FIG. 5, instead of splitting the rotating shaft 12 in half and fixing it to both sides of the shelf board 13,
One end of the partition plate 3' is brought into contact with the outer circumferential wall of the rotating shaft 12', and a partition plate 32 is inserted and fixed inside the rotating shaft 12' in parallel with the shelf plate 13'.

Further, in FIG. 6, the rotating shaft 41, the air supply passage 46, and the exhaust passage 50 are each formed of angle iron.

In FIG. 7, the air supply passage 56 and the exhaust passage 60 are formed by a cylindrical pipe, and two rows of second exhaust holes 58 are formed on both sides slightly laterally from the top of the cylindrical pipe. on both sides of the
In FIG. 8, an air supply passage 66 and an exhaust passage 70 are formed of angle-shaped steel, and a second air supply hole 68 and a second exhaust hole 82 are formed of angle-shaped steel. Two rows are formed on both sides slightly to the side of the top of the steel.

In the embodiments shown in FIGS. 7 and 8 above, when the material to be fermented is placed, the second air supply hole 58 or 68
This has the effect of preventing clogging.

In each of the above embodiments, the opening area of the first air supply hole increases from the side where the air supply pipe is connected to the rotating shaft toward the other end, and the opening area of the second air supply hole increases as the rotation of the air supply passage increases. By increasing the size from the shaft side to the other end side, the amount of air supplied can be kept constant over the entire surface of the shelf board.

By configuring this idea as described above,
By exhausting air from the bottom of the shelf floor, air is evenly vented upward from the top of each fermentation stage.
Air can be evenly supplied to any cross-sectional layer of the fermented material deposited on the tray, and the air for ventilation is effectively heat-exchanged between the exhaust air and the fermenter, and the fermented material is Temperature maintenance is performed effectively.
In addition, since the fermentation exhaust gas is uniformly sucked from the entire surface of the fermented product, the exhaust gas does not get stuck on the surface of the fermented product, become a drain, and partially condense on the surface of the fermented product, preventing fermentation. It has the excellent effect of being able to produce a stable fermented product.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing the internal structure of a conventional multi-stage fermenter, Fig. 2 is a perspective view showing a conventional air supply device, and Fig. 3 is an embodiment of the air supply and exhaust device according to this invention. FIG. 4 is a side sectional view showing the same embodiment in a stepwise section, and FIGS. 5 to 8 are sectional views showing other embodiments of the invention. 12... Rotating shaft, 13... Shelf board, 14... Upper passage, 15... Lower passage, 16... Half cylinder, 17
...Air supply passage, 18...First air supply hole, 19...Second air supply hole, 20...Semi-cylinder, 21...Exhaust passage,
22...first exhaust hole, 23...second exhaust hole.

Claims (1)

[Scope of utility model registration request] The fermenter has a plurality of fermentation shelves in the fermenter, and each fermentation shelf consists of a plurality of shelf plates each fixed to a rotating shaft so as to be able to swing freely between a horizontal position and a downward position. In a multi-stage fermenter, the rotating shaft is hollow and the interior is divided into upper and lower stages to form an upper passage and a lower passage, the upper passage is connected to an air supply pipe, and the lower passage is connected to an exhaust pipe. air passages are formed on the upper surface of the shelf board, and each air passage communicates with the upper passage, and is connected to the outside through an air hole bored in the outer wall of the air passage. An exhaust passage is formed on the lower surface of the shelf board, and this exhaust passage communicates with the lower passage and communicates with the outside through an exhaust hole bored in the outer wall of the exhaust passage. An air supply and exhaust device for a multistage fermenter, characterized in that: