JPH0871595A - Solidification treatment and pressure feed equipment for soft mud - Google Patents

Abstract

PURPOSE: To subject dredged soft mud or the like to solidification treatment automatically, continuously and uniformly. CONSTITUTION: Solidification treatment and pressure feed equipment for soft mud is constituted of a transfer device 200 consisting of a vertical screw conveyor 210, a pressure pump 220, a discharge pipe 250 and the flowmeter 230, check valve 240 and ejector 260 provided on the way of the discharge pipe and a solidifying agent adding device 300 consisting of a solidifying agent silo 310, a solidifying agent feeder 320 and a vertical screw conveyor 330.

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] The present invention continuously and uniformly adds a solidifying agent to soft soil such as mud dredged and collected in rivers, lakes and marshes, sewage sludge and dehydrated sludge in sewage treatment plants, etc. The present invention relates to a solidification treatment pressure-feeding facility for soft mud transferred by transportation.

[0002]

2. Description of the Related Art Conventionally, in order to knead and solidify such soft mud, a certain amount of soft mud and a solidifying agent corresponding to this quantity are put into a tank and mixed with a kneader having an agitation function attached to the tank or portable. The mixture was uniformly mixed by manually stirring it with the stirrer of No. 1, or the soft mud contained in the container and the solidifying agent were mixed with each other by human manipulation using a civil construction equipment such as a backhoe.

[0003]

The above-mentioned kneading in the tank and kneading by the operation of the stirrer or the civil construction equipment are all batch processes, which not only take a lot of time and are complicated, but also mud feeding. , Operations such as solidifying agent addition, kneading, and discharging are performed intermittently, resulting in poor work efficiency.
If the flow rate of the treated soft mud changes momentarily, it is difficult to deal with this promptly, and since the proper solidifying agent that does not match the flow rate is not mixed, there is a problem that the strength of the solidified softened sludge produced is not constant. It was For this reason, there has been a strong demand for a method of efficiently and automatically mixing the solidifying agent that matches the flow rate of the soft mud.

[0004]

In order to solve the above-mentioned problems, in the present invention, a solidification treatment of soft mud in which the stored soft mud is transferred and a solidifying agent is uniformly mixed with the soft mud during the transfer. A pumping facility comprising a transfer device and a solidifying agent adding device, the transfer device comprising a vertical screw conveyor, a pressure pump disposed downstream of the vertical screw conveyor, a discharge pipe, and the discharge pipe And a solidifying agent supplying device connected to the solidifying agent silo and an upstream side of the pressurizing pump subsequent to the solidifying agent silo, and a flowmeter and an ejector for injecting compressed air. It is composed of a vertical screw conveyor. Further, in the second invention, the vertical screw conveyor of the solidifying agent adding device is 300-800.
It is a variable speed in the range of rpm. Furthermore, the third
In the invention, a variable speed rotary feeder is adopted as the solidifying agent feeder. Further, in the fourth aspect of the invention, the check valve is arranged immediately below the vertical screw conveyor of the solidifying agent adding device to prevent the solidifying agent from flowing back. On the other hand, in the fifth aspect of the invention, in order to efficiently suck the stored soft mud, a stirrer is provided in front of the suction port of the vertical screw conveyor of the transfer device to stir and fluidize the soft mud rotationally driven around the vertical axis. .

[0005]

In the present invention, an appropriate amount of the solidifying agent is added immediately before the pressurizing pump according to the flow rate of the softener during the air transferring of the sludge to the transfer place such as a landfill, and when passing through the pressurizing pump or air conveying. It is mixed and stirred with the soft mud while flowing in the discharge pipe,
A uniform mixed state is transferred to the destination. The solidifying agent adding device in the present invention is usually arranged immediately before the negative pressure pressurizing pump to facilitate mixing of the solidifying agent into the transfer mud. In order to prevent the trouble that the positive pressure is generated and the solidifying agent flowing back flows, the vertical screw conveyor is operated at high speed,
Alternatively, a rotary feeder is used as a feeder having an air sealing function under the solidifying agent silo, and a check valve is provided. Further, in the fifth invention, a stirring device having a stirring blade that rotates around the vertical axis is provided in front of the suction port at the lower end of the vertical screw conveyor, and the stirring and fluidization of the soft mud around the vertical screw conveyor suction port is achieved. , Cutting and subdividing a large solidified mud mixed in soft mud to facilitate suction into a vertical screw conveyor.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 4 relate to an embodiment of the present invention,
FIG. 1 is an overall configuration diagram of the solidification treatment pumping facility, FIG. 2 is an overall side view of the vertical screw conveyor, FIG. 3 is a side view taken along line AA of FIG. 2, and FIG. 4 is a plan view taken along line BB of FIG. It is a figure. As shown in FIG. 1, the soft mud solidification treatment pumping equipment 1000 of the present invention is roughly divided into a transfer device 200 and a solidifying agent addition device 300.
Formed from. The transfer device 200 takes in the soft mud M stored in the earth carrier 100 and other storage tanks and transfers it to a remote destination, and the vertical screw conveyor 210.
The soft mud M taken in is pressurized by the pressure pump 220, transferred to the discharge pipe 250 via the flow meter 230 and the check valve 240, and supplied by the compressor 262 by the ejector 260 provided in the middle of the discharge pipe 250. The compressed sludge is blown in and the sludge is transported by plug transport (plug transport).

On the other hand, the solidifying agent adding device 300 includes a solidifying agent silo 310 for storing the solidifying agent, a solidifying agent supplier 320 following the solidifying agent silo 310, a vertical screw conveyor 330, and a check valve 34.
It is formed from 0 and. The reason why the solidifying agent adding device 300 is connected to the discharge pipe 250 immediately before the pressurizing pump 220 is that the normal pressurizing pump 220 is always in a negative pressure state immediately before the pressurizing pump 220, so that the solidifying agent is smoothed. To the discharge pipe 25
This is because the soft mud M can be mixed into the soft mud M without causing any trouble. However, due to some unforeseen circumstances during operation, a positive pressure (plus pressure) is also applied to the discharge pipe 250 immediately before the pressurizing pump.
In this case, the solidifying agent to be added flows backward to cause a trouble of hindering smooth supply. As a measure to prevent such trouble, a check valve 340 is provided under the vertical screw conveyor 330 to prevent backflow, and the solidifying agent is strongly transferred to the discharge pipe 250 even in a slight positive pressure state as a transfer means. A vertical screw conveyor 330 that can be transferred is used. The vertical screw conveyor 330 strongly moves the solidifying agent downward without backflow even in the above-mentioned positive pressure state, so that the rotation speed thereof is variable in the range of 300 to 800 rpm. The reason for limiting the above numerical values is that the lower limit value of 300 rpm is likely to cause backflow below the upper limit value of 800 rpm.
This is because pm does not change the backflow prevention effect even if the speed is higher than the actually generated plus pressure. The solidifying agent feeder 320 may be of any type such as a table feeder, a piston feeder or a belt feeder as long as it can quantitatively supply the powdery solidifying agent. It should be noted that the rotary feeder, which has a simple structure and is compact, can supply an arbitrary fixed amount, and can be transferred and supplied in an airlock state, is adopted.

A flow meter 23 for detecting the flow rate of the soft mud M.
The control device 400 that receives a detection signal of 0 stores in advance the set value of the supply amount of the solidifying agent that is adapted to the soft mud flow rate, and the controller 400 sets the solidifying agent supply amount that is compatible with the actual measured value of the soft mud flow rate during operation. After calculating, solidifying agent supply machine 320
An operation command is sent to the driving device 320a of FIG. 2 to supply an appropriate amount of the solidifying agent, which is introduced immediately before the pressure pump 220 and mixed into the soft mud M by the negative pressure suction force of the pressure pump 220.

On the other hand, in the vertical screw conveyor 210 according to the embodiment of the present invention, as shown in FIGS. 2 to 4, a vertical cylindrical casing 211 is concentric with the casing 211 and has a spiral screw around the periphery thereof. The rotary shaft 212 to which the blades 213 are attached is rotatably supported via bearings at the upper and lower ends,
It is rotatably driven at a variable speed by the hydraulic motor 212a at the top, and the soft mud taken in from the suction port 214 which is an opening provided in the lower side surface is discharged from the discharge port 215 and transferred to the pressure pump 220 to be pressurized as described above. . Screw speed is 40
Variable from 0 to 1200 rpm. A stirrer 216 is provided in front of the suction port 214 in order to stir and flow the soft mud around the suction port 214 in the vertical screw conveyor 210 to facilitate and facilitate the transfer to the suction port 214.

The stirrer 216 includes supports 216a, 21 extending horizontally from the upper and lower portions of the casing 211.
A pair of upper and lower stirring blades 218 (218a, 218b) attached to a vertical stirring shaft 217 supported by bearings 217b and 217c arranged at the tip of the hydraulic pump 217a.
It is configured to be rotationally driven at a variable speed via. The stirrer 216 is installed at one position in front of the suction port 214, and as shown in FIG. Stirring blade 218
Bends the ends of a plurality of arms (four in the example of FIGS. 2 to 4) horizontally from the stirring shaft 217 upward or downward at a substantially right angle, and arranges a plurality of protrusions on the outside at substantially equal intervals. It is provided, and the tip of the protrusion is formed into a sharp blade shape. Three
In the type having the stirring device 216 at the part, only the stirring device 216 at the center has upper and lower stirring blades 218a and 218.
b, and the left and right stirring devices 216 are provided on the lower stirring blades 21.
The one provided with only 8b is also used, and it is used when the equipment 1000 directly dredges and transfers it at the dredging site, and is particularly suitable when water pollution due to stirring is disliked. Of course, in such a device for treating soft mud in a storage tank without fear, the left and right stirring devices 216 also include a pair of upper and lower stirring blades 218a, 2a.
One provided with both 18b may be adopted. All of the stirring devices 216 shown in FIGS. 2 to 4 are driven to rotate by a hydraulic motor 217a provided at the top, and there is a merit that the rotation direction and the rotation speed can be freely selected independently. is there. On the other hand, as another driving method, there is also a type in which the central stirring device 216 among the three stirring devices 216 is driven by the hydraulic motor 212a, and the stirring devices 216 on both sides are chain-driven via sprockets.
In this type, the rotation direction and the rotation speed cannot be set independently, but the drive device cost can be reduced. The rotation speed of the stirring shaft 217 of the stirring device 216 is usually 5 to 5.
The speed is variable at 50 rpm, and the number of rotations is increased / decreased according to the viscosity of the soft mud and the degree of water content (water content). Flow meter 230
The electromagnetic flowmeter of the principle of measuring the electromotive force induced by applying a magnetic field perpendicular to the flow direction according to the size of the amount of the soft mud passing is used, but other flowmeters may be used.

On the other hand, the solidifying agent adding device 300 is connected to the discharge pipe 250 between the discharge port 215 of the vertical screw conveyor 210 and the pressurizing pump 220 as described above, and the discharge pipe 250 is being transferred. The solidifying agent corresponding to the flow rate is supplied to the soft mud. The solidifying agent silo 310 contains powder such as cement or cement-based solidifying agent, and the solidifying agent feeder 3
20 is, for example, a rotary feeder or a table feeder,
Flow meter 230 using a feeder such as a piston feeder
The drive device 320a is controlled in accordance with the actual flow rate of the soft mud measured in 1. to adjust the supply amount. The solidifying agent may be in the form of powder, or a slurry with water added,
The choice is determined by the degree of soil mix. However, it is more economical to use the powder as it is, so use the powder as it is if there is not much difference. When the powder is sent as a powder, the solidifying agent supplied in a fixed amount by the solidifying agent feeder 320 is transferred downward by the vertical screw conveyor 330. The solidifying agent may be supplied as a powder, but depending on the soil quality, a slurry with water added is desirable in order to mix it uniformly with the soft mud. In the case of slurry-like addition, a solidifying agent supply device 320 is provided with a storage tank equipped with a mixer (mixing stirrer), and a water supply line is connected thereto to make powdery solidifying agent into a slurry, which is then discharged by a piston pump. To the solidifying agent ooze 1m ^3, 50~200k
g (usually 100 kg). In the present invention, as described above, the solidifying agent is introduced from immediately before the pressurizing pump 220 by using the negative pressure of the pressurizing pump 220 into the soft sludge that is pneumatically conveyed in the discharge pipe 250. By rotating the blades, the slurry is mixed well with the soft mud and the powder or water is added in an amount commensurate with the flow rate of the soft mud to supply the slurry, so that it is evenly mixed with the soft mud during plug transport to a remote destination. After reaching, after a certain period of time (usually 2 to 7 days), it solidifies beyond the required strength. In other words, the amount of solidifying agent added depends on the type of mud soil and how many kgf / cm
Determine the addition amount depending on whether you want the strength of ² . As a matter of course, the larger the added amount, the faster and harder the solidified. As described above, since the uniform mixing of the soft mud and the solidifying agent in the present invention is efficiently performed during the plug transportation in the discharge pipe, the length of the discharge pipe 250 is required to be at least 50 m. It is also possible to directly equip the dredger with the equipment of the present invention, dredge soft mud such as sludge on the sea floor, perform solidification treatment, and transport to a distant destination. The feature of the present invention is that mixing of the solidifying agent and the soft mud has one-stage mixing by rotation of the pressure pump and two-stage mixing by repeated operation of plug generation to destruction in plug transportation in the discharge pipe. This is that the stirring is sufficiently performed and the homogeneity (kneading degree) is very high. Further, in the present invention, as the solidifying agent adding device 300, the solidifying agent supplied from the solidifying agent silo 310 is transferred to the vertical screw conveyor 330 immediately before the pressurizing pump 220. The vertical screw conveyor 330 can be installed at 300 rp even if a positive pressure is generated in the discharge pipe for some reason.
It is possible to prevent the backflow of the solidifying agent by increasing the speed to m or more, using the solidifying agent feeder 320 as a rotary feeder having an air-sealing function, or providing a check valve 340 directly below the vertical screw conveyor 330. Therefore, the backflow trouble can be avoided.

[0012]

Industrial Applicability As described above, in the solidification treatment pressure-feeding facility of the present invention, mud feeding, transfer, solidifying agent feeding, kneading, and discharging are automatically performed in a continuous operation. As described above, since a solidifying and kneading step is not required separately, an efficient and uniform mixed and solidified softened sludge can be obtained.
Further, since the solidifying agent is introduced from the pressure pump, the solidifying agent is easily supplied, and the kneading with the soft mud is sufficiently performed, so that a more uniform mixed state is secured. Moreover, since the solidifying agent adding device has a function of preventing the reverse flow of the solidifying agent due to the positive pressure in the discharge pipe, the smooth supply of the solidifying agent is ensured.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a solidification processing pressure-feeding facility according to an embodiment of the present invention.

FIG. 2 is an overall side view of a vertical screw conveyor according to an embodiment of the present invention.

FIG. 3 is a side view taken along the line AA of FIG.

FIG. 4 is a plan view taken along the line BB of FIG.

[Explanation of symbols]

 100 earth carrier 200 transfer device 210 vertical screw conveyor 211 casing 212 rotary shaft 212a hydraulic motor 213 screw blade 214 suction port 215 discharge port 216 stirring device 216a support 216b support 217 stirring shaft 217a hydraulic motor 217b bearing 217c bearing 218 stirring blade 218a Stirring blade (upper) 218b Stirring blade (lower) 219 Fixed blade 220 Pressurizing pump 220a Hydraulic motor 230 Flowmeter 240 Check valve 250 Discharge pipe 260 Ejector 262 Compressor 300 Solidifying agent addition device 310 Solidifying agent silo 320 Solidifying agent feeder (Rotary feeder) 320a Drive device 330 Vertical screw conveyor 340 Check valve 400 Control device 1000 Solidification processing pumping facility

Claims (5)

[Claims] 1. A sludge solidification treatment pressure-feeding facility for transporting stored soft sludge and uniformly mixing a solidifying agent with the soft sludge during transport, comprising a transport device and a solidifying agent adding device.
The transfer device is composed of a vertical screw conveyor, a pressure pump arranged downstream of the vertical screw conveyor, a discharge pipe, a flow meter arranged in the middle of the discharge pipe, and an ejector for injecting compressed air. A solidification processing pressure-feeding facility for soft mud, wherein the solidification agent addition device is composed of a solidification agent silo, a solidification agent feeder that is connected to the solidification agent silo and is connected to the upstream side of the pressure pump, and a vertical screw conveyor. 2. The vertical screw conveyor of the solidifying agent adding device has a variable speed in the range of 300 to 800 rpm.
Equipment for solidification treatment and pumping of soft mud as described. 3. The solidification processing pressure-feeding facility for soft mud according to claim 1 or 2, wherein the solidifying agent feeder is a variable speed rotary feeder. 4. The soft mud solidification treatment pressure-feeding facility according to claim 1, 2 or 3, wherein a check valve is provided directly below the vertical screw conveyor of the solidifying agent addition device. 5. The softening treatment pressure feeding of soft mud according to claim 3 or 4, further comprising a stirrer in front of the suction port of the vertical screw conveyor of the transfer device for stirring and fluidizing the soft mud which is rotationally driven about the vertical axis. Facility.