JPH11165193A - Transfer system for dewatered sludge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly transfer a dewatered sludge in a pipe under pressure. SOLUTION: A dewatered sludge 2 is fed into a hopper 1 and the sludge 2 in the hopper 1 is transferred through a pipe 3 and a pipe 13 by a first transfer means 10, following which the sludge 2 is heated by a heating device 4 to improve its fluidity. The heated sludge 2 is then transferred through a pipe 14 to an incinerator 5 by a second transfer means 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

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

[0003]

The conveyor 4 described above.
When transferring the dewatered sludge by a, 4b, 4c, and 4d, there are the following problems.

That is, (1) conveyors 4a, 4b, 4
For c and 4d, a transport unit and a case are required, so that the space is increased. In addition, linear transfer is mainly performed, and it is troublesome to secure the transfer route.

(2) The conveyors 4a, 4b, 4c, and 4d have many drive units (drive rollers, guide rollers, gears, chains, and the like) and require a great deal of inspection labor to prevent wear of the guide rollers.

(3) In operation by the conveyors 4a, 4b, 4c and 4d, the conveyor 4a, 4b
4b, 4c, and 4d are likely to cause odor leakage from the connection portion,
Also, it is difficult to prevent odor leakage during overhaul.

[0007] The present invention has been made in view of the above points, and an object of the present invention is to provide a dewatered sludge transfer system that can smoothly transfer dehydrated sludge without taking up space.

[0008]

According to the present invention, there is provided a hopper for storing dewatered sludge, and a transfer device connected via piping to a downstream side of the hopper and for pressure-feeding the dewatered sludge. A dehydration apparatus characterized by providing a heating device for heating the dewatered sludge in the piping, a thermometer near the transfer device, and a control device for operating the transfer device based on a signal from the thermometer. Sludge transfer system, sludge heating and dewatering machine, tubular shooter connected to heating and dewatering machine and tapering downward, and connected via piping to the downstream side of tubular shooter to feed dewatered sludge A transfer device for dewatered sludge, comprising a lubricating oil injection device for injecting lubricating oil toward the inner wall of the shooter, and a heating and dewatering device for sludge, comprising: Dehydrator A transfer device connected to the flow side via a pipe and for pumping dewatered sludge is provided, and a hot water pipe for supplying hot water to a pipe on the downstream side of the transfer apparatus and a discharge pipe for discharging hot water are sequentially connected from the upstream side. It is a transfer system of dewatered sludge characterized by the following.

According to the present invention, the fluidity of the dewatered sludge can be increased by heating the dewatered sludge with a heating device,
Thereafter, the dewatered sludge can be smoothly pumped in the pipe by the transfer device.

In addition, the dewatered sludge heated by the heating dehydrator is sent to the cylindrical chute, and the lubricating oil is injected along the inner surface of the chute so that the sludge falls smoothly in the chute and is sent to the transfer device. Can be. The transfer device can smoothly feed the dewatered sludge having high fluidity into the pipe under pressure.

Further, the dewatered sludge which has been heated by the heating dehydrator and has increased fluidity is pressure-fed in the pipe by the transfer device. In this case, the dewatered sludge is transferred more smoothly by supplying hot water from the hot water pipe to the downstream pipe of the transfer device and discharging the hot water from the discharge pipe to increase the temperature of the pipe.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 are diagrams showing a first embodiment of a dewatered sludge transfer system according to the present invention.

As shown in FIGS. 1 to 3, the dewatered sludge transfer system includes a hopper 1 containing a dewatered sludge 2 and having a weighing scale (load cell) attached thereto, and pipes 3 and 13 connected to the hopper 1. , 14, a pressure-feeding first transfer means 10 disposed in the pipe 13, and a pressure-feeding second transfer means 11 disposed in the pipe 14.

The first transfer means 10 and the second transfer means 11 are driven by drive units 10a and 11a, respectively. The first transfer means 10 comprises a multi-screw feeder, and the second transfer means 11 comprises an extrusion pump.

A jacket-type heating device 4 is provided outside the pipe 13, and the heating device 4 has a heat-dissipating boiler (not shown) by discharging heat from an incinerator 5 as described later. Is heated from the steam pipe 17. Further, an automatic valve 16 is attached to the steam pipe 17.

The downstream end of the pipe 14 is connected to an incinerator 5 into which heated dehydrated sludge 18 is charged and incinerated. Exhaust heat from the incinerator 5 is taken out as steam by an 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 dewatered sludge 2 is attached to a pipe 14 between the heating device 4 and the second transfer means 11.
A second thermometer 19 for measuring the temperature of the dewatered sludge 2 is attached to the downstream pipe 14 of the transfer means 11.

The weight scale 20, the first thermometer 15, the second thermometer 19, the driving units 10a and 11a, and the automatic valve 16
Each is connected to the control device 12.

In FIG. 1, the heating device 4 is located upstream of the second transfer means 11.

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

First, the properties of the dewatered sludge 2 will be described with reference to FIG. As a means for dewatering sludge, there are usually a belt press dewatering and a centrifugal dewatering.
Before and after, moisture content around 75-85%, VS (organic solids)
With a / TS (solid content) ratio of around 80%, there is no fluidity. However, as shown in FIG. 2, the fluidity of the dewatered sludge 2 is improved by heating and heating, and the
The pressure loss at is reduced. For this reason, piping pressure feeding becomes possible.

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

The operation of the drive unit 10a causes the piping 3, 13
In the inside, the first transfer means 10 transfers the dewatered sludge 2, and at the same time, the heating device 4 heats the dewatered sludge with the opening of the automatic valve 16.

During this time, the temperature of the dewatered 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 control unit 12 activates the drive unit 11 a of the second transfer unit 11. By the operation of the driving unit 11a, the second transfer means 11 transfers the dewatered sludge 2 in the pipe 14, whereby the dewatered sludge 2 is sent to the incinerator 5.

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

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

As described above, according to the present embodiment, the fluidity of the dewatered sludge 2 can be improved by heating the dewatered sludge 2 by the heating device 4, and accordingly, the second transfer means 11 , And troubles such as abrasion and blockage in the pipe 14 can be avoided. Further, by making the heating device 4 a jacket type, the heating device 4 can be made more compact. In addition, the steam heated by the exhaust heat of the incinerator is led to the heating device 4 by the steam pipe 17 so that the heat can be reduced. Effective utilization can be achieved.

Further, since the first transfer means 10 is a multi-screw screw feeder, self-cleaning of the screw blades can be performed to prevent poor transfer of dehydrated sludge. In addition, since the second transfer means 11 is constituted by an extrusion pump, a high discharge pressure and high quantitativeness can be obtained. 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, a heating device 32 including a tube group 33 and a connecting tube 34 connecting the tube group 33 is provided instead of the jacket-type heating device 4. Is substantially the same as the first embodiment shown in FIGS.

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

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

The tube banks 33 are arranged in a zigzag pattern at a pitch of about 100 mm in order to prevent bridge formation of the dewatered sludge and increase heat conversion efficiency.

In FIG. 4, the heating device 32 is the first
It is located upstream with respect to 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, an automatic valve 4 is installed in a pipe 14 on the downstream side of the second transfer means 11.
0 and a drain pipe 4 with an automatic valve 42
3 are sequentially connected, and the other configuration is substantially the same as that of the second embodiment shown in FIG.

Referring to FIGS. 5 and 6, the second
The same reference numerals are given to the same portions as those in the embodiment, and the detailed description is omitted.

5 and 6, a hot water pipe 41 is provided with a waste heat boiler (not shown) by waste heat from the incinerator 5.
The steam heated in is introduced. The automatic valve 40 of the hot water pipe 41 and the automatic valve 42 of the drain pipe 43 are connected to the control device 12, respectively. 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.

5 and 6, first, the dehydrated sludge 2 is put into the hopper 1, and then the heating device 32 is operated by the control device 12 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
3 automatic valve 42 is opened, and 50 ° C.-1
Hot water of 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.

Thereafter, the first transfer means 10 is operated, and the dewatered sludge 2 is fed under pressure in the pipe 13. Next, the first thermometer 1
When the temperature of 5 becomes 60 ° C. or more, the second transfer means 11 is operated, and the dewatered sludge 2 is pumped in the pipe 14.

Next, 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 inflow of hot water into the inside is stopped, the hot water is replaced in the pipe 14 by the inflow of dehydrated sludge, and is discharged from the drain pipe 43.

Thereafter, when the concentration from the concentration meter 44 becomes 10% or more, the automatic valve 42 of the discharge pipe 43 is closed, and the dewatered sludge in the pipe 14 is sent into the incinerator 5.

According to the present embodiment, by supplying hot water from the hot water pipe 41 into the pipe 14, the inside of the pipe 14 can be preheated, and the temperature of the dewatered sludge in the pipe 14 can be prevented from lowering. it can. Further, since the dewatered sludge in the pipe 14 is always in contact with the 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 tapering downward is provided. 49, and other configurations are substantially the same as those of the first embodiment shown in FIGS.

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

There are several types of shooters 50. In the embodiment shown in FIG. 7, a plurality of nozzles 52 for jetting lubricating oil are provided on the inner wall of the upper portion of the shooter 50. Also, a pump (or automatic cylinder) is attached to the nozzle 52.
A lubricating oil tank 54 for waste oil, heavy oil, or the like is connected via 53. Further, the pump 53 is driven intermittently or continuously, and jets a small amount (eg, 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 mechanical equipment of a sewage treatment plant is used.

As the heating dehydrator 49, for example, a vertical thin film centrifugal dehydrator is used. Vertical thin film centrifugal dewatering machine is sludge (primary dewatered sludge: usually 80-90% water content) 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 heat and dehydrator 49 uses the latent heat of steam, the inflow steam 59a
Is usually 120 to 180 ° C., and the effluent steam 59b
Is leaked as. The temperature of the heated dewatered sludge 2 is around 90 ° C., and the water content is usually 40 to 50% (solid content 60 to 50%).
However, in this case, pumping cannot be performed as shown in FIG. 2, so that the water content is increased to 60 to 70% (solid content 40 to 30%) by increasing the supply amount of the sludge 55.

A blower 61 for discharging exhaust gas from the inside is provided above the heating and dehydrating machine 49. Further, a cut-out feeder 60 driven by a driving unit 60a is provided at a downstream end of the pipe 14.

In FIG. 7, the heat dewatered sludge 2 having a water content of 60 to 70% obtained by the heat dehydrator 49 has tackiness and smeltability, and adheres to the inner wall of the chute 50 and is laminated. The present invention prevents this, and the first transfer means 1 in the subsequent stage.
0 smoothly passes the entire amount of dewatered sludge.

That is, when the lubricating oil is injected from the nozzle 52 along the inner wall of the chute 50, the lubricating oil is
Cover the inner wall in a ring shape and then descend along the inner wall.
At this time, a lubricating oil film is formed on the entire inner wall of the shooter 50, and this film lasts for several hours. For this reason, the dewatered sludge 2 discharged and dropped from the heating type dehydrator 49 is
Drop to the first transfer means 10 without adhering to the inner wall of the first transfer means. The duration of the lubricating oil film on the inner wall of the shooter 50 is
Although it depends on the driving situation, it is usually several hours. Therefore, by injecting the lubricating oil about once an hour, the adhesion of the dewatered sludge 2 can be prevented.

The inner wall of the shooter 50 is covered or coated with a substance having a very small coefficient of friction (for example, a fluorine resin or polyethylene). For this reason, the dewatered sludge 2 descends without adhering to or laminating on the inner wall of the chute 50 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 being provided in the pipe 13, and a tapered screw feeder is used as the first transfer means 10.

The other structure is substantially the same as that of the fourth embodiment shown in FIG. 8, the same components as those of the fourth embodiment shown in FIG. 7 are denoted by the same reference numerals, and detailed description is omitted.

In FIG. 8, the dewatered sludge obtained by the dehydrator 49 is smoothly dropped downward by the first transfer means 10 comprising a tapered screw feeder in the shooter 50. Therefore, in FIG. 8, there is no need to provide a nozzle for injecting 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 hopper 1 is replaced with a heating dehydrator 4.
9 is provided, and the heating and dehydrating machine 49 is connected to the pipe 13 provided with the first transfer means 10 via the pipe 3.

In FIG. 9, the same portions as those in the first embodiment shown in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description is omitted.

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

The pipe 13 is provided with a first thermometer 15, and the pipe 14 is further provided with a hot water pipe 41 and a drain pipe 4.
The second thermometer 15 and the densitometer 44 are mounted between the second thermometer 3 and the third thermometer 3.

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

In FIG. 9, the sludge 55 in the storage tank 80
Is fed into the heating and dehydrating machine 49 by the transfer pump 81 to be heated and dehydrated. Therefore, the dewatered 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 operates. When the automatic valve 40 of the hot water pipe 41 is opened, for example, hot water of 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 becomes 60 ° C. or higher, 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 supply of hot water into the pipe 14 is stopped.

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

[0061]

As described above, according to the present invention, the dewatered sludge which has been heated and has improved fluidity can be smoothly fed into the pipe by the transfer device. Since the dewatered sludge is pumped in the pipe in this manner, the dewatered sludge is not exposed to the outside and does not cause a problem of odor pollution. In addition, since the fluidity of the dewatered sludge is improved by heating, troubles such as overload do not occur in the transfer device.

[Brief description of the drawings]

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

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

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

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

FIG. 5 is a schematic view showing a third embodiment of the transfer system for dewatered sludge.

FIG. 6 is a schematic diagram showing a third embodiment of the transfer system for dewatered sludge.

FIG. 7 is a schematic view showing a fourth embodiment of the transfer system for dewatered sludge.

FIG. 8 is a schematic view showing a fifth embodiment of the dewatered sludge transfer system.

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

FIG. 10 is a diagram showing a conventional dewatered sludge transfer system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hopper 2 Dehydration sludge 4 Heating device 10 1st transfer means 10a drive part 11 2nd transfer means 11a drive part 12 control device 13, 14 piping 15 1st thermometer 16 automatic valve 17 hot water pipe 19 2nd thermometer 32 heating device 41 Hot water pipe 43 Discharge pipe 44 Thermometer 49 Heat dehydrator 50 Shooter 52 Nozzle

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Keijiro Yasumura 2-4, Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Inside the Toshiba Keihin Plant (72) Inventor Koji Hayashi 1st Toshibacho, Fuchu-shi, Tokyo Toshiba Corporation Fuchu Factory

Claims (4)

[Claims] 1. A hopper for storing dewatered sludge, and a transfer device connected to a downstream side of the hopper via a pipe for pumping the dewatered sludge, wherein the dewatered sludge in the pipe is interposed between the hopper and the transfer device. A transfer system for dewatered sludge, comprising: a heating device for heating; a thermometer provided near the transfer device; and a control device for operating the transfer device based on a signal from the thermometer. 2. The dewatered sludge transfer system according to claim 1, wherein a hot water pipe for supplying hot water and a drain pipe for discharging hot water are sequentially connected to the downstream pipe of the transfer device from the upstream side. 3. A sludge heating and dewatering machine, a tubular shooter connected to the heating and dewatering machine and tapering downward, and connected to a downstream side of the tubular shooter via a pipe to pump the dewatered sludge. And a lubricating oil injection device for injecting lubricating oil toward the inner wall of the shooter is provided above the tubular shooter. 4. A hot water dewatering machine, comprising: a sludge heat dehydrator; and a transfer device connected to a downstream side of the heat dehydrator via a pipe for pumping the dewatered sludge, and supplying hot water to a pipe downstream of the transfer apparatus. A transfer system for dewatered sludge, wherein a pipe and a discharge pipe for discharging hot water are sequentially connected from an upstream side.