JPH08108200A - Solidifying treatment and pressure feed equipment of soft mud - Google Patents

Abstract

PURPOSE: To provide an equipment capable of solidifying stored soft mud automatically, continuously and easily. CONSTITUTION: Solidifying treatment and pressure feed equipment of soft mud is constituted of a soft mud quantitative supply device 100, a solidifying agent quantitative supply device 200, a soft mud kneader 300 and a soft mud pressure feed device 400. The soft mud quantitative supply device 100 is the vertical screw conveyor 120 of which the lower end is inserted in a mud storage tank 110 and the soft mud kneader 300 is a vertical or horizontal twin-screw paddle mixer and the soft mud pressure feed device 400 is constituted of a pressure pump 410, a discharge pipe 420 and an ejector 430.

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 equipment, which comprises a soft mud quantitative supply device, a solidifying agent quantitative supply device, a soft mud kneading device, and a soft mud pumping device, and the soft mud quantitative supply device immerses the lower end into a mud tank and the soft mud in the mud tank. A vertical screw conveyor, and the solidification agent quantitative supply device comprises a solidification agent silo and a solidification agent supply device connected to the softening agent silo and connected to the soft mud kneading device, and the soft mud kneading device is the soft mud mixing device. It consists of a vertical or horizontal two-axis paddle mixer following the constant quantity supply device, and the soft mud pressure feeding device is a pressurizing pump following the soft mud kneading device, a discharge pipe, and compressed air injection provided in the middle of the discharge pipe. With the ejector of It was. Further, in the second invention, a variable speed rotary feeder is adopted as the solidifying agent feeder. Furthermore, in the third aspect of the invention, a check valve is further added between the pressurizing pump and the ejector to prevent the backflow of the soft mud or to supply the solidifying agent that matches the flow rate of the soft mud. Further, in the fourth aspect of the invention, in order to efficiently suck the stored soft mud, a stirring device that is rotationally driven around the vertical axis is provided in front of the suction port of the vertical screw conveyor.

[0005]

In the present invention, the soft mud stored in the mud storage tank is conveyed by air to a distant transfer place such as a landfill, and an appropriate amount of a solidifying agent is added during the process, and the kneading is sufficiently kneaded to solidify the soft mud. The agent is transferred to the destination in a state where it is sufficiently uniformly mixed. That is, the soft mud in the mud storage tank is lifted by the vertical screw conveyor, discharged from the upper part, and then enters the soft mud kneading device, and is sufficiently kneaded in the soft mud kneading device together with the solidifying agent added by the solidifying agent quantitative supply device. After
The pressure is increased by the pressure pump, and the compressed air supplied by the ejector is transferred by the ejector pipe and transported by the plug to be ejected to a distant destination. When the solidifying agent feeder is a rotary feeder, the solidifying agent is kept airtight, and scattering to the surroundings and backflow due to back pressure are prevented. In addition, a flow meter for measuring the flow rate of soft mud is installed immediately after the vertical screw conveyor,
It is possible to easily supply an appropriate amount of the solidifying agent that matches the flow rate of the soft mud, and a check valve is provided between the pressurizing pump and the ejector to prevent the back flow of the soft mud in the discharge pipe. Further, in the fourth invention, a stirring device having a stirring blade rotating around the vertical axis is provided in front of the suction port at the lower end of the vertical screw conveyor, and the soft mud around the vertical screw conveyor suction port is stirred and fluidized. , 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 5 relate to an embodiment of the present invention,
FIG. 1 is an overall configuration diagram of the solidification processing pressure-feeding equipment, FIG. 2 is a detailed vertical sectional view of a main part of the solidification processing pressure-feeding equipment, FIG. 3 is a side view taken along line AA of FIG. 2, and FIG. 4 is BB of FIG. FIG. 5 is a schematic plan view showing various examples of the solidifying agent feeder. As shown in FIG. 1, the soft mud solidification treatment pressure-feeding facility 1000 of the present invention is roughly divided into a soft-mud quantitative supply device 100, a solidifying-agent quantitative supply device 200, a soft mud kneading device 300, and a soft mud pressure feeding device 400. To be done. Soft mud quantitative supply device 100
Is composed of a mud storage tank 110 and a vertical screw conveyor 120 that immerses the lower portion into the mud storage tank 110 to suck up the soft mud. The vertical screw conveyor 120 has a cylindrical casing 121 as shown in FIG. A rotary shaft 122 around which spiral screw blades 123 are fixedly installed is rotatably provided inside, and is rotatably driven by a hydraulic motor 122a to lift the soft mud from a lower suction port 124 and discharge it at an upper discharge port. It is designed to be discharged from 125. The amount of lifted mud is controlled by operating the hydraulic motor 122a to control the rotation speed of the rotary shaft 122.

The soft mud kneading device 300 is connected to the outlet 125 of the vertical screw conveyor 120 after the connection and is shown in FIGS.
As shown in FIG. 2, a vertical two-axis paddle mixer or a horizontal two-axis paddle mixer is adopted, but other kneading devices may be used. The vertical two-axis paddle mixer 300A includes two vertical rotary shafts 31 parallel to each other in a casing having an oval cross section.
0 is rotatably arranged in the opposite direction, and each rotary shaft 3
A plurality of paddle blades 320 are fixedly installed at a substantially equal interval in the pad 10, and the paddle blades 320 of one rotating shaft 310 are arranged in a state of being inserted in the middle of the paddle blades 320 of the other rotating shaft 310. The horizontal two-axis paddle mixer is a vertical two-axis paddle mixer just placed horizontally, and a plurality of paddle blades are attached around two parallel horizontal rotation axes. As shown in FIG. 1, a solidifying agent constant amount supply device 200 is disposed above the soft mud kneading device 300 (vertical biaxial paddle mixer 300A). The solidifying agent quantitative supply device 200 includes a solidifying agent silo 210 and a solidifying agent feeder 220 subsequent to the solidifying agent silo 210, and adds an appropriate amount of the solidifying agent to the soft mud of the soft mud kneading device 300. The solidifying agent feeder 220 may be of any type as long as it can quantitatively supply the powdery solidifying agent, and various types as shown in FIG. 5 can be used. Then, in order to enable the solidifying agent feeder 220 to supply the solidifying agent addition amount that matches the softening agent flow rate measured by the flow meter 130 arranged between the vertical screw conveyor 120 and the soft mud kneading device 300, control is performed. The motor 220m is controlled via the device 230 to a rotation speed that gives an addition amount that matches the soft mud flow rate. Further, the result is confirmed by the flowmeter 440 arranged behind the pressurizing pump 410.
The solidifying agent feeder 220 preferably has a closed structure including a closed cover in order to handle the powdery solidifying agent. Also,
As shown in FIG. 2, the rotary feeder 220A equipped with an airlock mechanism is solidified so that the backflow of the solidifying agent does not occur due to the reverse pressure (plus pressure) from the soft mud kneading device 300 connected to the solidifying agent feeder 220. It can also be adopted in the agent feeder 220. Further, in order to prevent such a back pressure trouble, a check valve may be provided between the solidifying agent feeder 220 and the soft mud kneading device 300.

Next, the soft mud pressure feeding device 400 will be described. The soft mud pressure feeding device 400 includes a pressurizing pump 410 following the soft mud kneading device 300, a discharge pipe 420 for transferring the soft mud after the pressurizing pump, an ejector 430 for injecting compressed air provided in the middle of the discharge pipe 420, and a compression device. It is composed of a compressor 432 serving as an air supply source. Soft mud kneading device 3
The soft mud sufficiently mixed with the solidifying agent at 00 is pressurized by the pressurizing pump 410, is transferred to the downstream inside the discharge pipe 420, and is further plug-transported (plugged) by the compressed air injected from the ejector 430 on the way. Transportation) and is transported by air to a distant destination. A flow meter 440 and a check valve 450 are preferably disposed between the pressurizing pump 410 and the ejector 430, and the check valve 450 prevents the compressed air injected from the ejector 430 from flowing backward. As described above, the flow meter 440 measures the flow rate of the soft mud after the addition of the solidifying agent, while the vertical screw conveyor 120 preliminarily informs the control device 230 that receives the detection signal of the flow meter 130 that detects the flow rate of the soft mud. The set value of the supply amount of the solidifying agent suitable for the soft mud flow rate is stored, and the controller 230 calculates the solidifying agent supply amount suitable for the actual measured value of the soft mud flow rate during operation. An operation command is sent to the (motor) 220 m to supply an appropriate amount of the solidifying agent to the soft mud kneading device 300.

On the other hand, in the vertical screw conveyor 120 according to the embodiment of the present invention, as shown in FIGS. 2 to 4, a vertical cylindrical casing 121 is concentric with the casing 121 and has a spiral screw. The rotary shaft 122 to which the blades 123 are attached is rotatably supported via upper and lower bearings,
It is rotatably driven at a variable speed by the hydraulic motor 122a at the top, and the soft mud taken in from the suction port 124 which is an opening provided in the lower side surface is discharged from the discharge port 125 and transferred to the soft mud kneading device 300 as described above. Screw speed is 400-1
Variable at 200 rpm. Vertical screw conveyor 12
A stirrer 126 is disposed in front of the suction port 124 for the purpose of stirring and flowing the soft mud around the suction port 124 at 0 to facilitate and facilitate the transfer to the suction port 124.

The stirrer 126 includes supports 126a and 12 which are horizontally projected from two upper and lower portions of the casing 121.
A pair of upper and lower stirring blades 128 (128a, 128b) attached to a vertical stirring shaft 127 supported by bearings 127b, 127c arranged at the tip of 6b is used as a hydraulic motor 127a.
It is configured to be rotationally driven at a variable speed via. The stirrer 126 is installed at one place in front of the suction port 124, and as shown in FIG. Stirring blade 128
Bend the tips of a plurality of arms (four in the example of FIGS. 2 to 4) horizontally from the stirring shaft 127 upward or downward at substantially right angles, and arrange 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 126 at each position, only the stirring device 126 at the center has upper and lower stirring blades 128a, 128.
b, and the left and right stirring devices 126 are the lower stirring blades 12
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 any fear, the left and right stirring devices 126 also have a pair of upper and lower stirring blades 128a, 1a.
One provided with both 28b may be adopted. All of the stirring devices 126 shown in FIGS. 2 to 4 are driven by a hydraulic motor 127a provided at the top thereof, which is advantageous in that the rotation direction and the rotation speed can be independently selected. is there. On the other hand, as another driving method, there is also a type in which the central stirring device 126 among the three stirring devices 126 is driven by the hydraulic motor 122a, and the stirring devices 126 on both sides are driven by a chain 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 127 of the stirring device 126 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 440
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, as described above, the solidifying agent quantitative supply device 200 is disposed on the top of the soft mud kneading device 300 and is connected to the soft mud kneading device 300. A suitable solidifying agent is supplied. Powder such as cement or cement-based solidifying agent is put in the solidifying agent silo 210, and the solidifying agent feeder 220 is, for example, as described above, the rotary type as shown in FIG. A feeder such as a feeder, a table feeder, or a piston feeder is adopted, and the motor 220m is controlled according to the actual flow rate of the soft mud measured by the flow meter 130 to adjust the supply amount. The solidifying agent may be a powder as it is or a slurry with water added, and the selection is determined by the degree of mixing depending on the soil. 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. In the case of sending in the form of powder, the solidifying agent supplied in a fixed amount by the solidifying agent feeder 220 is sufficiently kneaded by the soft mud kneading device 300 and then transferred downward. 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 220 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. 1m softening agent
^It is added in a ratio of 50 to 200 kg (usually 100 kg) with respect to ³ . In the present invention, as described above, the softening agent which is air-transported in the discharge pipe 420 is added in advance with the solidifying agent in the softening agent kneading device 300 to sufficiently knead it to make it uniform, and the blade of the pressurizing pump 410 The slurry is further kneaded by rotating and is mixed with powder or water in an amount commensurate with the flow rate of the soft mud to supply the slurry, so that the soft mud during plug transport is evenly mixed well and after reaching the remote destination. After a certain period of time (usually 2 to 7 days), it solidifies beyond the required strength. That is, the addition amount of the solidifying agent is determined depending on the type of mud soil and how many kgf / cm ² of strength the material should have after a certain number of days. As a matter of course, the larger the added amount, the faster and harder the solidified. As described above, the uniform mixing of the soft mud and the solidifying agent in the present invention is carried out efficiently during the plug transportation in the discharge tube after the sufficient mixing in the soft mud kneading device 300 in advance, and thus the discharge tube 420 A length of at least 50 m in the past can further reduce the required length. 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 the solidifying agent and the soft mud are mixed in the soft mud kneading device 300 first.
After the first-stage mixing is completed, the two-stage mixing by the rotation of the pressure pump and the three-stage mixing by the repeated operation of the plug generation and the destruction in the plug transportation in the discharge pipe are performed, so that the mixing and stirring are sufficiently performed and the uniform mixing is performed. The point is that once (kneading degree) is very high. Further, in the present invention, the solidifying agent constant amount supply device 200
As the solidifying agent supplied from the solidifying agent silo 210 is kneaded by the soft mud kneading apparatus 300, at the same time, the soft mud kneading apparatus 3
Since the head pressure of the soft mud in 00 is immediately before the pressurizing pump 410, it is not only smoothly introduced into the negative pressure discharge pipe 420, but also a positive pressure is generated in the discharge pipe for some reason. Even if the solidifying agent feeder 220 is a rotary feeder having an air seal function, or the solidifying agent feeder 22 is used.
Since a backflow of the solidifying agent can be prevented by providing a check valve directly below 0, backflow trouble can be avoided.

[0012]

Industrial Applicability As described above, the sludge solidification treatment pressure-feeding equipment of the present invention is efficient and efficient in that mud feeding, solidifying agent feeding, kneading, and discharging are carried out automatically and continuously. And,
A uniform mixed and solidified soft mud can be obtained. Further, since the solidifying agent is introduced into the soft mud kneading device, it can be easily supplied, and since it is sufficiently kneaded with the soft mud, a more uniform mixed state is secured. Further, the solidifying agent quantitative supply device is connected to the soft mud kneading device and has a function of preventing backflow because the soft mud in the soft mud kneading device absorbs the reverse flow of the solidifying agent due to the positive pressure in the discharge pipe. Therefore, 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 a detailed vertical cross-sectional view of a main part of a solidification processing pressure-feeding facility 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.

FIG. 5 is a schematic explanatory view of various solidifying agent feeders according to an embodiment of the present invention.

[Explanation of symbols]

 100 Soft Mud Amount Supply Device 110 Soil Storage Tank 120 Vertical Screw Conveyor 121 Casing 122 Rotating Shaft 122a Hydraulic Motor 123 Screw Blade 124 Suction Port 125 Discharge Port 126 Stirrer 126a Support 126b Support 127 Stirring Shaft 127a Hydraulic Motor 127b Bearing 127c Bearing 128 Blade 128a Stirring blade (upper) 128b Stirring blade (lower) 129 Fixed blade 130 Flowmeter 200 Solidifying agent constant amount supply device 210 Solidifying agent silo 220 Solidifying agent feeder 220A Rotary feeder 220m Motor 230 Control device 300 Soft mud kneading device 300A Vertical type 2 Axial paddle mixer 310 Rotating shaft 320 Paddle blade 400 Soft mud pressure feeding device 410 Pressurizing pump 410a Motor 420 Discharge pipe 430 Ejector 432 Compressor 440 The amount a total of 450 non-return valve 1000 solidification processing pumping equipment

Claims (4)

[Claims] 1. A solidification treatment pressure-feeding facility for softened sludge, which transports the stored sludge and uniformly mixes the solidified agent with the softened sludge during the transport, which comprises a fixed sludge constant supply device, a solidifying agent constant supply device, and a sludge. The kneading device and the soft mud pressure feeding device are configured, and the soft mud quantitative feeding device is composed of a mud storage tank and a vertical screw conveyor whose lower end is immersed in the soft mud in the mud storage tank. The agent silo and a solidifying agent feeder connected to the solidifying agent silo and connected to the soft mud kneading apparatus, and the soft mud kneading apparatus comprises a vertical or horizontal two-axis paddle mixer following the soft mud quantitative feeding apparatus. The soft mud pressure-feeding device is a solidification treatment pressure-feeding facility for the soft mud, which comprises a pressurizing pump following the soft mud kneading device, a discharge pipe, and an ejector for injecting compressed air disposed in the discharge pipe. 2. The softening treatment pressure-feeding facility according to claim 1, wherein the solidifying agent feeder is a variable speed rotary feeder. 3. A check valve is added between the pressurizing pump and the ejector, a soft mud flow meter is provided between the vertical screw conveyor and the soft mud kneading device, and the soft mud flow rate is adjusted via a control device. The softening treatment pressure-feeding facility according to claim 1 or 2, wherein the solidifying agent feeder is controlled so as to do so. 4. A stirrer for stirring and fluidizing the sludge, which is rotationally driven around a vertical axis, is provided in front of the suction port of the vertical screw conveyor of the fixed sludge metering device. Equipment for solidification treatment of soft mud.