JPS586559B2 - Fermenter gas diffusion prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas diffusion prevention device for preventing the diffusion of harmful gases generated in a fermenter for composting organic sludge.

When sludge accumulated in a fermentation tank is turned over, a larger amount of gas is generated than in a steady state, the odor concentration increases rapidly, and a large amount of water vapor is generated.

As an absorber for such generated gas, there has been a conventional device shown in FIG.

, 1 indicates a fermentation tank, and this fermentation tank 1 has a rectangular shape with an open top surface, and for example, two tanks AB are arranged in parallel.

Inside the fermentation tank 1, sludge 2 is stored in an accumulated state up to a predetermined height.

Air (oxygen) is supplied to the sludge 2 from an air supply port 4 communicating with an air supply blower 3, and composting is promoted by this action.

On the other hand, 5 is a sludge turning device, which is movably supported by rails 6 attached to the upper part of the fermentation tank 1.

The switching device 5 includes a frame-shaped vehicle body 7 that moves along the rails 6, and a flight conveyor 8 that is held in a downwardly inclined manner by the vehicle body 7.

Therefore, by moving the vehicle body 7 in the direction of the arrow (forward movement),
The sludge 2 is scooped up by the flight conveyor 8 and dropped backward.

As a result, the accumulated sludge is folded back.

On the other hand, reference numeral 9 denotes a moving trolley supported on a trolley rail 10 provided at the bottom of the fermenter in a direction perpendicular to the rail 6, and its movement moves the switching device 5 from the A tank side to the B tank side. Then, move them from the B tank side to the A tank side.

Below the moving trolley 9 is a flight conveyor 11 for discharging.
is provided.

When the above-mentioned turning device 5 moves and turns back the accumulated sludge 2, a large amount of gas is generated.

Therefore, a plurality of exhaust ports 12 are formed on the side of the fermenter 1, and the generated gas is discharged to the outside via the exhaust pipe 12a.

By the way, in this case, the gas generated inside the fermenter 1 during normal operation can be suctioned and discharged from the exhaust port 12, but as shown in the figure, most of the gas generated when turning back is directed upward. Therefore, the exhaust port 12 cannot absorb the air.

If this is to be absorbed at a stage inside the fermenter, a large-capacity exhaust fan is required, which has the disadvantage of increasing operating costs.

This invention was made in order to eliminate such drawbacks, and by packaging the upper part of the cutting area and providing ventilation means inside the packaging, the gas collected in the packaging is returned to the fermenter. It is an object of the present invention to provide a gas diffusion prevention device for a fermenter that does not release gas generated when turning over to the outside and has a high exhaust effect.

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 2 to 9.

In FIG. 2, parts 1 to 12 are the same as in FIG. 1 above.

Reference numeral 13 denotes a package part provided to cover the part above the open surface of the fermenter of the turning device 5, and the inside contains the parts shown in FIG.
As shown in FIG. 4, a ventilation blower 14 is provided as ventilation means.

This ventilation blower 14 sucks the gas inside the package through an intake port 15 and discharges it through a ventilation duct 16.
Return to the front inside.

Additionally, necessary equipment (not shown) such as a flight conveyor driving motor is also installed in the package section 13.

On the other hand, a cord reel 17 is installed in the upper part of the package part 13, and a power cord 17a is wound therein in a flexible manner.

Therefore, the switching device 5 can be moved freely.

The power cord 17a is for supplying power to the ventilation blower 14, the driving section (not shown) of the switching device 5, etc. inside the package section 13.

This is convenient when arranging fermenters in multiple rows.

On the other hand, telescopic covers 18, 18 are provided before and after the package part 13 on the open surface of the fermenter 1.

The covers 18, 18 are connected to the package part 13 on the front side, for example, via a motor cylinder or a magnetic attachment/detachment device (not shown), and on the rear side, a fixing member (not shown) is formed on the package part 13. and is connected by locking a hanger, which will be described later, to the fixing member.

The structure of the cover 18 is shown in FIG.

The structure of the cover itself is the same on both the front and rear sides.

Reference numeral 20 denotes a cover hanger, and rotating rollers 20a are provided at both ends of the hanger.

A plurality of these hunkers 20 are attached to, for example, the upper surface of the cover 18 in parallel at predetermined intervals.

The cover 18 is, for example, sheet-like and can hang between adjacent hangers 20.

On the other hand, guide grooves 21, 21 are formed inside the upper wall surface of the fermenter 1 as shown in FIG.

The guide grooves 21, 21 are provided with the hanger 2.
The rollers 20a, 20a of 0 are fitted.

As a result, the cover is stretched as shown in FIG. 2.

In the above case, the attachment part between the cover 18 and the hanger 20 is
For example, it may be widened as shown in FIG.

If it is inconvenient for the guide groove 21 to protrude from the wall surface as shown in FIG. 5, it can be provided by forming a step at the upper end of the side wall as shown in FIG. good.

Then, the guide groove 21 is scraped by a scraper (not shown) provided in the package part 13 as necessary.

Therefore, the roller always rolls smoothly.

Furthermore, instead of the scraper, air blowing from the ventilation means within the package section 13 may be used to achieve the same purpose as the scraper.

Incidentally, such a scraping means is similarly provided for the rail 6 as well.

Next, FIG. 9 shows the flow system of the air supply and exhaust system of FIG. 2.

An exhaust pipe 22 has each end communicating with each exhaust port 12 of the fermenter 1, and the other end communicates with two exhaust blowers 23a and 23b.

In the illustrated example, two groups of fermenters are installed, so the same configuration is adopted for the other fermenter.

Each of the blowers 23a and 23b is connected to the deodorizing device 2.
4a and 24b, and then further connected to the odor 25.

The deodorizing devices 24a and 24b have exactly the same function, but are designed to be used selectively. For example, the deodorizing device 24a is used both when the switching device 5 is not operating normally and when the switching device 5 is not operating. The deodorizing device 24b is used only when the switching device 5 is activated.

Each of the blowers 23a, 23b also has the deodorizing device 24a,
24b.

Therefore, the displacement amount by each of the blowers 23a and 23b is at its maximum when turning back.

Next, the operation will be explained.

Now, when the switching device 5 is operated, the flight conveyor 8 rotates to sequentially turn back the sludge 2 that has been accumulated and fermented for a predetermined time, and the turned back sludge 2 is sent backward by a predetermined distance.

At this time, the cover on the rear side of the package part 13 of the cover 18.18 is expanded, while the cover on the front cover 14 is contracted.

Therefore, even if the switching device 5 moves, the open surface of the fermenter 1 remains covered by the covers 18, 18 at all times.

As already mentioned, during this turning, a larger amount of gas is generated than during normal operation, and this gas rises above the turning device 5.

Most of this rising gas is accommodated inside the package section 13.

The gas inside the cage part 13 is fed to the air intake port 1 of the ventilation blower 14.
5 and returned to the fermenter 1 through the ventilation duct 16.

The gas returned into the fermenter 1 is sucked together with the gas generated in the stationary portion through an exhaust port 12 provided on the side surface of the fermenter 1, and is guided through an exhaust pipe 22 to exhaust blowers 23a, 23b.

When switching over, both the ventilation blowers 23a and 23b are driven together and the exhaust volume is at its maximum, so that the fermenter 1
The effect of internal gas emissions is also maximized.

Therefore, it can sufficiently cope with a large amount of gas generated when turning back.

The waste gases that have passed through the blowers 23a and 23b are deodorized through the corresponding deodorizing devices 24a and 24b, respectively, and then discharged to the outside from the odor port 25a.

On the other hand, the stable generated gas when the switching device 5 is not activated and in a steady state is concentrated in the upper part of the fermenter 1 .

Therefore, this gas is sucked by the exhaust port 12 that is opened just at the concentrated portion, is led to the exhaust blower 23a via the exhaust pipe 22, and then is introduced into the deodorizing device 24.
After being deodorized through a, the odor exit 25
released to the outside.

The amount of gas generated in this case is much smaller than that in the above-mentioned case of turning back.

Therefore, the exhaust blower 24a alone can provide a sufficient exhaust effect.

The same applies to deodorizing equipment.

The above operation is exactly the same for the fermenter group on the other side.

It is preferable that the ventilation duct 16 at the time of turning is extended downward and opened just at the exhaust port 12, and the exhaust effect will be high.

Furthermore, in the above embodiments, the exhaust volume was controlled by changing the number of exhaust blowers during turnaround and steady state, but it may also be controlled by changing the rotation speed instead of the number of blowers. .

Moreover, they can also be combined.

Note that the above-mentioned switching period is approximately (1 to 2 hours/1 tank/1 day).

As described above, according to the present invention, the upper part of the sludge cutting device is covered with a package part, and the open surface of the fermenter is covered with a cover, and a large amount of gas generated during cutting is collected in the package part, and the collected gas is passed through the ventilation means. Since the fermenter is discharged by returning it to the vicinity of the exhaust port in the fermenter, a large amount of gas generated at the time of turning can be reliably collected, and the generated gas can be released from the fermenter to the outside. There is no.

Therefore, the capacity of the exhaust means can be much smaller than that of the conventional one.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the configuration of a conventional fermenter, FIG. 2 is a perspective view of a gas diffusion prevention device for a fermenter according to an embodiment of the present invention, and FIG. 3 is a side view of the same device. Fig. 4 is a front view of the same device, Fig. 5 is a perspective view of the main parts of the same device, Fig. 6 is a perspective view of a modification thereof, and Fig. 7 is a cross section of other main parts of the same device. FIG. 8 is a sectional view of a modification thereof, and FIG. 9 is an air supply and exhaust system diagram of the same device. 1...Fermentation tank, 5...Sludge cutting device, 12...Exhaust port, 13...Package section, 14...Ventilation blower, 23
a, 23b...Exhaust blower.

Claims (1)

[Scope of Claims] 1. A sludge turning device that moves along the open surface of a fermenter, a package portion that covers a portion of the turning device above the fermenter, and a package portion provided within the package portion,
A fermenter gas dispersion device comprising a ventilation means for returning the gas in the package part to the vicinity of the exhaust port in the fermenter, and an exhaust means for sucking the gas in the fermenter from the exhaust port and discharging it to the outside. Prevention device. 2. Gas dissipation in a fermenter according to claim 1, wherein the exhaust volume is varied between when the switching device is activated and when it is not activated by providing a plurality of exhaust stages and controlling the number thereof. Prevention device.