JP3529609B2 - Dewatered sludge transfer system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dehydration sludge transfer system installed in a sewage treatment plant, and more particularly to a dehydration sludge transfer system capable of smoothly and compactly transferring dehydrated sludge.

[0002]

2. Description of the Related Art A conventional dehydrated sludge transfer system is shown in FIG.
Shown in. In FIG. 10, the dehydrated sludge 2 obtained by a dehydrator (not shown) is stored in the hopper 1. Then, the dehydrated sludge 2 is transferred by the transfer device 3, and then the conveyors 4a, 4
It is transferred to the incinerator 5 by b, 4c and 4d.

[0003]

[Problems to be Solved by the Invention] The above-mentioned conveyor 4
When the dehydrated sludge is transferred by a, 4b, 4c, and 4d, there are the following problems.

That is, (1) conveyors 4a, 4b, 4
For c and 4d, a transport section and a case are required, which increases the space. In addition, the straight line transfer is mainly used, which makes it difficult to secure the transfer route.

(2) Conveyors 4a, 4b, 4c, and 4d have many driving portions (driving rollers, guide rollers, gears, chains, etc.), and a great deal of inspection labor is required to prevent wear of the guide rollers and the like.

(3) In the operation by the conveyors 4a, 4b, 4c, 4d, the conveyor 4a,
Odor easily occurs from the connection parts 4b, 4c, 4d,
Also, it is difficult to prevent odor leakage during overhaul.

The present invention has been made in view of the above points, and an object of the present invention is to provide a dehydrated sludge transfer system capable of smoothly transferring dehydrated sludge without taking up space.

[0008]

The present invention is directed to a sludge heating dehydrator, a cylindrical shooter connected to the heating dehydrator and tapering downward, and a pipe provided downstream of the cylindrical shooter. And a transfer device for sending the dehydrated sludge under pressure,
A dehydration sludge transfer system, which is equipped with a lubricating oil injection device that injects lubricating oil toward the inner wall of the shooter, and a sludge heating dehydrator, and piping downstream of the heating dehydrator. And a transfer device for sending the dehydrated sludge under pressure, and a hot water pipe for supplying hot water to a pipe on the downstream side of the transfer device and a discharge pipe for discharging the hot water are sequentially connected from the upstream side. This is a dewatered sludge transfer system.

[0009]

According to the present invention, the dehydrated sludge heated by the heating dehydrator is sent to the cylindrical shooter, and the lubricating oil is sprayed along the inner surface of the shooter to smoothly drop the dehydrated sludge in the shooter. It can be sent to a transfer device. The transfer device can smoothly pump the dehydrated sludge having high fluidity in the pipe.

Further, the dehydrated sludge heated by the heating dehydrator and having high fluidity is pressure-fed in the pipe by the transfer device. In this case, by supplying hot water from the hot water pipe to the downstream pipe of the transfer device and discharging it from the discharge pipe to raise the temperature of the pipe, the dehydrated sludge can be transferred more smoothly.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION First Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 3 are views showing a first embodiment of a dehydrated sludge transfer system according to the present invention.

As shown in FIGS. 1 to 3, the dehydrated sludge transfer system stores a dehydrated sludge 2 and a hopper 1 to which a weight scale (load cell) is attached, and pipes 3 and 13 connected to the hopper 1. , 14, a first pressure-feeding type transfer means 10 arranged in the pipe 13, and a second pressure-feeding type transfer means 11 arranged in the pipe 14.

Of these, the first transfer means 10 and the second transfer means 11 are adapted to be driven by drive units 10a and 11a, respectively. The first transfer means 10 is a multi-screw feeder, and the second transfer means 11 is an extrusion pump.

A jacket-type heating device 4 is provided outside the pipe 13, and the heating device 4 uses an exhaust heat boiler (not shown) by exhaust heat from an incinerator 5 as described later. The steam heated in 1 flows in from the steam pipe 17. Further, an automatic valve 16 is attached to the steam pipe 17.

Further, the downstream end of the pipe 14 is connected to the incinerator 5 in which the heated dehydrated sludge 18 is charged and incinerated, and the exhaust heat from the incinerator 5 is taken out as steam by the exhaust heat boiler, This steam is sent to the steam pipe 17.

Further, as shown in FIG. 1, a first thermometer 15 for measuring the temperature of the dehydrated sludge 2 is attached to the pipe 14 between the heating device 4 and the second transfer means 11,
A second thermometer 19 for measuring the temperature of the dehydrated sludge 2 is attached to the downstream pipe 14 of the transfer means 11.

Further, the weighing scale 20, the first thermometer 15, the second thermometer 19, the drive units 10a and 11a and the automatic valve 16 are
Each is connected to the control device 12.

The heating device 4 is located upstream of the second transfer means 11 in FIG.

Next, the operation of this embodiment having such a configuration will be described.

First, the properties of the dehydrated sludge 2 will be described with reference to FIG. Belt sludge dewatering and centrifugal dewatering are commonly used as sludge dewatering means.
Before and after, water content around 75-85%, VS (organic solids)
When the / TS (solid content) ratio is around 80%, there is no fluidity. However, as shown in FIG. 2, the fluidity of the dehydrated sludge 2 is improved by heating and heating, so that the inside of the pipes 3, 13, 14
The pressure loss at is reduced. Therefore, it is possible to pump the pipe.

Next, the specific operation will be described with reference to the flow chart shown in FIG. As shown in FIG. 3, first, when the dehydrated sludge 2 is put into the hopper 1, a signal from the weighing scale 20 is input to the control device 12, and the control device 12 causes the first
The drive part 10a of the transfer means 10 is operated and the automatic valve 16 is opened.

By the operation of the drive unit 10a, the pipes 3, 13
The first transfer means 10 transfers the dehydrated sludge 2 therein, and simultaneously with the opening of the automatic valve 16, the dehydrator sludge is heated by the heating device 4.

During this time, the temperature of the dehydrated sludge 2 is measured by the first thermometer 15 and the second thermometer 19, and the measured temperature is sent to the controller 12. Then, when the temperature measured by the first thermometer 15 reaches, for example, 60 ° C. or higher, the controller 12 operates the drive unit 11 a of the second transfer unit 11. By the operation of the drive unit 11a, the second transfer means 11 transfers the dehydrated sludge 2 in the pipe 14, and thus the dehydrated sludge 2 is sent to the incinerator 5.

Usually, when the dehydrated sludge 2 is heated to 60 ° C. or higher, the fluidity is improved, and the pressure loss becomes about 3 to 10 kgf / cm ² in the pipe 14 having a length of 20 to 100 m, for example. Therefore, the dehydration sludge 2 can be more reliably pressure-fed by the second transfer means 11.

The heating temperature of the dehydrated sludge 2 can be adjusted to 50 ° C. to 100 ° C. as desired by using the first thermometer 15 and the second thermometer 19.

As described above, according to the present embodiment, by heating the dehydrated sludge 2 by the heating device 4, the fluidity of the dehydrated sludge 2 can be improved, and the second transfer means 11 is accompanied therewith. It is possible to avoid the excessive torque, and the troubles such as wear and blockage in the pipe 14. Furthermore, by making the heating device 4 a jacket type, the heating device 4 can be made compact, and the steam heated by the exhaust heat of the incinerator is guided to the heating device 4 by the steam pipe 17, so It can be effectively used.

Further, since the first transfer means 10 is a multi-screw feeder, it is possible to prevent the defective transfer of the dehydrated sludge by self-cleaning the screw blades. Further, since the second transfer means 11 is composed of an extrusion pump, it is possible to obtain high discharge pressure and high quantitativeness. Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment shown in FIG. 4, instead of the jacket-type heating device 4, a heating device 32 including a tube group 33 and a connecting tube 34 connecting the tube group 33 is provided, and another configuration is provided. Is substantially the same as that of the first embodiment shown in FIGS.

In FIG. 4, the same parts as those in the first embodiment shown in FIGS. 1 to 3 are designated by the same reference numerals and detailed description thereof will be omitted.

That is, as shown in FIG. 4, a heating device 32 consisting of a tube group 33 and a connecting pipe 34 is provided, and this heating device 32 is attached to the pipe 3 connected to the lower end of the hopper 1. . Further, in the tube group 33 of the heating device 32,
A steam pipe 17 to which an automatic valve 16 is attached is connected. Furthermore, the automatic valve 16 is connected to the control device 12.

The tube groups 33 are arranged in a staggered pattern at a pitch of about 100 mm in order to prevent the formation of bridges of dewatered sludge and to enhance the heat conversion efficiency.

In FIG. 4, the heating device 32 is the first
It is located upstream of the transfer means 10 and the second transfer means 11. Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIGS.

In the third embodiment shown in FIGS. 5 and 6, the automatic valve 4 is provided in the pipe 14 on the downstream side of the second transfer means 11.
Hot water pipe 41 having 0 and drain pipe 4 having automatic valve 42
3 are sequentially connected, and the other structure is substantially the same as that of the second embodiment shown in FIG.

In FIGS. 5 and 6, the second shown in FIG.
The same parts as those of the embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

In FIG. 5 and FIG. 6, a hot water pipe 41 is provided with an exhaust heat boiler (not shown) by exhaust heat from the incinerator 5.
It is designed so that the steam heated at will flow in. The automatic valve 40 of the hot water pipe 41 and the automatic valve 42 of the drain pipe 43 are each connected to the control device 12. Further, a concentration meter 44 is attached to the pipe 14 near the second thermometer 19, and the concentration meter 44 is connected to the control device 12.

In FIGS. 5 and 6, first, the dehydrated sludge 2 is put into the hopper 1, and then the controller 32 operates the heating device 32 to heat the dehydrated sludge 2 from the hopper 1. At the same time, the automatic valve 40 of the hot water pipe 41 and the drain pipe 4
The automatic valve 42 of No. 3 is opened, and the hot water pipe 41 moves from 50 ° C. to 1
Hot water at 00 ° C. flows into the pipe 14 at a pressure of 1 to ² kgf / cm ² and is discharged from the drain pipe 43.

After that, the first transfer means 10 is operated and the dehydrated sludge 2 is pressure-fed in the pipe 13. Next, the first thermometer 1
When the temperature of 5 becomes 60 ° C. or higher, the second transfer means 11 operates and the dehydrated sludge 2 is pressure-fed in the pipe 14.

Next, when the temperature of the second thermometer 19 exceeds 50 ° C., the automatic valve 40 of the hot water pipe 41 is closed and the pipe 14
The inflow of hot water into the inside is stopped, and the hot water is replaced in the pipe 14 by the inflow of the dehydrated sludge, and the hot water is discharged from the drain pipe 43.

After that, when the concentration from the densitometer 44 reaches 10% or more, the automatic valve 42 of the discharge pipe 43 is closed and the dehydrated sludge in the pipe 14 is sent into the incinerator 5.

According to the present embodiment, by supplying hot water into the pipe 14 from the hot water pipe 41, the inside of the pipe 14 can be preheated and the temperature decrease of the dehydrated sludge in the pipe 14 can be prevented. it can. Moreover, since the dehydrated sludge in the pipe 14 is always in contact with hot water, the resistance in the pipe 14 can be reduced. Fourth Embodiment Next, a fourth embodiment of the present invention will be described with reference to FIG.

In the fourth embodiment shown in FIG. 7, the heating device 4 is removed, and instead of the hopper 1, a cylindrical shooter 50 that tapers downward is provided, and a heating dehydrator is provided above the shooter 50. 49 is provided, and the other structure is substantially the same as that of the first embodiment shown in FIGS. 1 to 3.

In FIG. 7, the same parts as those of the first embodiment shown in FIGS. 1 to 3 are designated by the same reference numerals and detailed description thereof will be omitted.

Several types of shooters 50 are conceivable, but in the embodiment shown in FIG. 7, a plurality of nozzles 52 for jetting lubricating oil are provided on the upper inner wall of the shooter 50. Also, a pump (or an automatic cylinder) for the nozzle 52
A lubricating oil tank 54 for waste oil, heavy oil, etc. is connected via 53. Further, the pump 53 is intermittently or continuously driven to eject a small amount (for example, about 10 ml) of lubricating oil substantially horizontally along the inner wall of the shooter 50. As the lubricating oil stored in the lubricating oil tank 54, heavy oil or waste oil generated from the mechanical equipment of the sewage treatment plant is used.

As the heating dehydrator 49, for example, a vertical thin film type centrifugal dehydrator is used. Vertical thin film centrifugal dehydrator is sludge (primary dehydrated sludge: normal water content is 80-90%) 5
5 is formed into a thin film by the rotating scraper blades 56, and is indirectly heated and dehydrated by heat from the steam jacket 57. Since the latent heat of steam is used in the heating dehydrator 49, the incoming steam 59a
Temperature is usually 120-180 ℃, the outflow steam 59b
Is leaked as. The temperature of the heated dehydrated sludge 2 is around 90 ° C, and the water content is usually 40 to 50% (solid content 60 to 50%).
However, since pumping is impossible with this as shown in FIG. 2, the water content is set to 60 to 70% (solid content 40 to 30%) by increasing the supply amount of the sludge 55.

A blower 61 for discharging the exhaust gas inside is provided above the heating dehydrator 49. Further, a cutting feeder 60 driven by a driving unit 60a is provided at the downstream end of the pipe 14.

In FIG. 7, the heated dewatered sludge 2 having a water content of 60 to 70% obtained by the heated dewatering machine 49 has adhesiveness and causticity, and adheres to the inner wall of the shooter 50 and is laminated. The present invention prevents this, and the first transfer means 1 in the subsequent stage
It allows the total amount of dehydrated sludge to pass smoothly to zero.

That is, when the lubricating oil is sprayed from the nozzle 52 along the inner wall of the shooter 50, the lubricating oil is discharged.
The inner wall of the is covered in a ring shape and then descends along the inner wall.
At this time, a film of lubricating oil is formed on the entire inner wall of the shooter 50, and the film lasts for several hours. For this reason, the dehydrated sludge 2 discharged and dropped from the heating type dehydrator 49 is not captured by the shooter 50.
To the first transfer means 10 without adhering to the inner wall thereof. The duration of the lubricating oil film on the inner wall of the shooter 50 is
It usually takes several hours, although it depends on the driving situation. Therefore, by injecting the lubricating oil once per hour, it is possible to prevent the dewatered sludge 2 from adhering.

The inner wall of the shooter 50 is covered or coated with a substance having a very small friction coefficient (for example, fluorine resin, polyethylene, etc.). For this reason, the dehydrated sludge 2 does not adhere to the inner wall of the shooter 50 or descends without being stacked, and is smoothly supplied to the first transfer means 10. Fifth Embodiment Next, a fifth embodiment of the present invention will be described with reference to FIG. In the fifth embodiment shown in FIG. 8, the first transfer means 10 is provided in the shooter 50 instead of in the pipe 13, and a taper screw feeder is used as the first transfer means 10.

The other structure is almost the same as that of the fourth embodiment shown in FIG. In FIG. 8, the same parts as those of the fourth embodiment shown in FIG. 7 are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 8, the heated dehydrated sludge obtained by the heated dehydrator 49 smoothly drops downward in the shooter 50 by the first transfer means 10 composed of a taper screw feeder. Therefore, in FIG. 8, it is not necessary to provide a nozzle for injecting the lubricating oil toward the inner wall of the shooter 50. Sixth Embodiment Next, a sixth embodiment of the present invention will be described with reference to FIG.

In the sixth embodiment shown in FIG. 9, the heating device 4 is removed and the heating dehydrator 4 is used instead of the hopper 1.
9 is provided, and this heating dehydrator 49 is connected via the pipe 3 to the pipe 13 provided with the first transfer means 10.

In FIG. 9, the same parts as those of the first embodiment shown in FIGS. 1 to 3 are designated by the same reference numerals and detailed description thereof will be omitted.

In FIG. 9, a heating dehydrator 49 is provided upstream of the first transfer means 10, and a storage tank 80 for storing sludge 55 is provided further upstream of the heating dehydrator 49. A transfer pump 81 is arranged between the storage tank 80 and the heating dehydrator 49.

Further, the pipe 1 on the downstream side of the second transfer means 11
4, a hot water pipe 41 having an automatic valve 40 and a drain pipe 43 having an automatic valve 42 are sequentially connected.

A first thermometer 15 is attached to the pipe 13, and a hot water pipe 41 and a drain pipe 4 are attached to the pipe 14.
The second thermometer 15 and the densitometer 44 are attached between the second thermometer 15 and the third thermometer 15.

In FIG. 9, steam heated by an exhaust heat boiler (not shown) due to exhaust heat from the incinerator 5 flows into the hot water pipe 41. Further, the automatic valve 40 of the hot water pipe 41 and the automatic valve 42 of the discharge pipe 43 are respectively provided in the control device 1
Connected to 2. Further, the first thermometer 15, the second thermometer and the densitometer 44 are also connected to the control device 12.

In FIG. 9, the sludge 55 in the storage tank 80
Is sent into the heating dehydrator 49 by the transfer pump 81 to be heated and dehydrated. Therefore, the dehydrated sludge is in a heated state.

Next, the automatic valve 40 of the hot water pipe 41 and the automatic valve 42 of the discharge pipe 43 are opened, and the first transfer means 10 is operated. When the automatic valve 40 of the hot water pipe 41 is opened, hot water of, for example, 50 ° C. to 100 ° C. is supplied from the hot water pipe 41 to the pipe 14 at a pressure of 1 to ² kgf / cm ² to heat the pipe 14.

When the temperature of the first thermometer 15 exceeds 60 ° C., the second transfer means 11 operates. Further, when the temperature of the second thermometer 19 becomes 50 ° C. or higher, the automatic valve 40 of the hot water pipe 41 is closed and the hot water supply to the pipe 14 is stopped.

Then, in the pipe 14, the hot water is replaced by the dehydrated sludge, and the hot water is discharged from the discharge pipe 43. When the concentration of the densitometer 44 becomes 10% or more, the automatic valve 42 of the discharge pipe 43 is closed and the dehydrated sludge is sent to the incinerator 5.

[0061]

As described above, according to the present invention, the dehydrated sludge that is heated and has improved fluidity can be smoothly pumped in the pipe by the transfer device. Since the dehydrated sludge is pressure-fed in the pipe as described above, the dehydrated sludge is not exposed to the outside and the problem of odor pollution does not occur. Moreover, since the fluidity of the dehydrated sludge is improved by heating, trouble such as overloading of the transfer device does not occur.

[Brief description of drawings]

FIG. 1 is a schematic view showing a first embodiment of a dehydrated sludge transfer system according to the present invention.

FIG. 2 is a characteristic diagram showing the relationship between the temperature of dewatered sludge and the pressure loss in the pipe.

FIG. 3 is a flowchart showing the operation of the transfer system.

FIG. 4 is a schematic diagram showing a second embodiment of a dewatered sludge transfer system.

FIG. 5 is a schematic diagram showing a third embodiment of a dehydrated sludge transfer system.

FIG. 6 is a schematic diagram showing a third embodiment of a dehydrated sludge transfer system.

FIG. 7 is a schematic diagram showing a fourth embodiment of a dewatered sludge transfer system.

FIG. 8 is a schematic diagram showing a fifth embodiment of a dehydrated sludge transfer system.

FIG. 9 is a schematic diagram showing a sixth embodiment of a dehydrated sludge transfer system.

FIG. 10 is a view showing a conventional dehydrated sludge transfer system.

[Explanation of symbols]

1 hopper 2 Dewatered sludge 4 heating device 10 First transfer means 10a drive unit 11 Second transfer means 11a drive unit 12 Control device 13, 14 piping 15 First thermometer 16 Automatic valve 17 Hot water pipe 19 Second thermometer 32 heating device 41 Hot water pipe 43 Discharge pipe 44 thermometer 49 heating dehydrator 50 shoots 52 nozzles

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Keijiro Anmura, Inventor 2-4 Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Keisei Plant, Toshiba Corporation (72) Inventor, Koji Hayashi 1 Address: Toshiba Fuchu factory (56) Reference JP-A-1-315396 (JP, A) JP-A-58-163499 (JP, A) JP-A-6-7799 (JP, A) JP-A-1 -284400 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) C02F 11 / 00-11 / 20

Claims (2)

(57) [Claims] 1. A sludge heating / dehydrating machine, a tubular shooter connected to the heating / dehydrating machine and tapering downward, and connected via a pipe to the downstream side of the tubular shooter to pump the dehydrated sludge under pressure. A transfer system for dehydrated sludge, characterized in that a lubricating oil injection device for injecting lubricating oil toward the inner wall of the shooter is provided on the upper part of the cylindrical shooter. 2. Hot water for supplying sludge heat dehydrator and a transfer device which is connected to the downstream side of the heat dehydrator via a pipe and pressure-feeds the dehydrated sludge, and supplies hot water to the pipe downstream of the transfer device. A transfer system for dehydrated sludge, characterized in that a pipe and a discharge pipe for discharging hot water are sequentially connected from the upstream side.