JP4158470B2 - Sludge transfer system and sludge heat treatment facility - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
Sludge transfer system and sludge heat treatment (drying, pyrolysis) facilities, especially sludge transfer system suitable for heat treatment of dewatered sludge generated in sewage treatment facilities and factories It relates to a heat treatment facility for sludge.
[0002]
[Prior art]
FIG. 6 is a schematic view of a conventional sludge transfer system, and shows, for example, a dewatered sludge discharge form in a sewage treatment plant.
[0003]
The water-containing sludge generated at the sewage treatment plant is usually dehydrated in the dehydrator 1 and dehydrated to a moisture content of about 85%, for example. The dewatered sludge is temporarily stored in a sludge storage hopper 2 (for example, 5 to 10 m ³ ), and then periodically sends a sludge carrying truck 10 to the lower portion of the sludge storage hopper 2 so that the sludge storage hopper 2 The lower opening / closing part 22 is opened and moved to the track 10. The dewatered sludge is usually carried out for incineration or landfill after being carried out of the facility by a truck 10 or the like. Alternatively, for example, a drying process or a carbonization process is also attempted in a heat treatment facility.
[0004]
[Problems to be solved by the invention]
When dewatered sludge is dried and further carbonized in an existing sludge treatment facility, it will be taken out from the existing sludge discharge port and transferred, but how can this sludge be transported to the dryer and carbonizer? It is important to configure.
[0005]
For example, when inspecting the drying and carbonization equipment, the equipment related to these equipments will be stopped for a certain period of time. It is necessary to keep it.
[0006]
At this time, there is an idea of processing the hopper and installing a carry-out pump. However, since the dewatered sludge from the dehydrator cannot be stopped, the installation of the discharge pump is difficult.
[0007]
The present invention has been made in view of such circumstances, and an object thereof is to provide a sludge transfer system and a sludge heat treatment facility capable of supplying dehydrated sludge to the next step without stopping the sludge treatment system.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is characterized by the following.
[0009]
The invention described in claim 1 is provided with a sludge transfer hopper that detachably attaches sludge received from the hopper to a remote place on the sludge discharge side of an existing sludge storage hopper, and the sludge transfer hopper is configured to remove the sludge from the system. It is characterized in that it is provided with transfer means for transferring it.
[0010]
The invention according to claim 2 is the sludge transfer system according to claim 1,
The sludge transfer hopper includes lifting means and wheels, and is characterized by being movable in the vertical direction and the horizontal direction.
[0011]
The invention described in claim 3 is a sludge heat treatment facility equipped with a sludge transfer system for transferring sludge received from an existing sludge storage hopper,
The sludge transfer system is detachably equipped with a sludge transfer hopper on the sludge discharge side of the sludge storage hopper for transferring the sludge received from the hopper to a remote place,
The sludge transfer hopper includes a transfer means for transferring the sludge to a heat treatment furnace provided in a heat treatment facility.
[0012]
According to a fourth aspect of the present invention, in the sludge heat treatment facility according to the third aspect, the heat treatment furnace includes a drying furnace for drying the sludge supplied from the sludge treatment system.
[0013]
According to a fifth aspect of the present invention, in the sludge heat treatment facility according to the fourth aspect of the present invention, the heat treatment furnace includes a pyrolysis furnace for pyrolyzing the sludge supplied from the drying furnace.
[0014]
A sixth aspect of the present invention is the sludge heat treatment facility according to any one of the third to fifth aspects, wherein the sludge heat treatment facility is provided on a workpiece supply side of a drying furnace or a pyrolysis furnace, and the workpiece is input. It is characterized in that a metering supply means is provided for supplying a fixed amount of sludge to each of the drying furnace and the pyrolysis furnace based on the result of the integration after the quantity is measured and integrated. Here, the input amount means mass or capacity.
[0015]
In the sludge transfer system according to claims 1 and 2, since the sludge transfer hopper is detachably provided in the existing facility, there is no need to modify or change the facility. This makes it possible to carry out any sludge treatment such as transporting dewatered sludge to a new heat treatment facility or carrying out sludge by truck during maintenance inspection of the heat treatment facility without stopping the dewatered sludge from the dehydrator. It becomes. In addition, in the existing sludge treatment facility, by installing a heat treatment facility to which sludge is provided via a sludge transfer hopper, it is possible to process the sludge at the sludge generation source.
[0016]
Further, as in the heat treatment facility according to claims 3 to 6, by providing the sludge transfer system, it is possible to perform sludge drying treatment and thermal decomposition treatment at an existing facility, and sludge generation at the sludge generation source. Since processing is possible, it is possible to perform sludge treatment at a lower cost than when sludge is transported out of the facility and processed. Moreover, since the dry matter and carbide obtained by the drying and pyrolysis treatment can be used as effective resources, there is no need for incineration or landfilling of sludge, and a more inexpensive sludge treatment can be performed.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0018]
FIG.1 and FIG.2 is schematic which shows one Embodiment of the sludge transfer system of this invention. In particular, FIG. 1 shows a state in which the received sludge is transferred to the heat treatment facility, and shows a state where the sludge transfer hopper is mounted on the sludge storage hopper. FIG. 2 shows a state in which a truck is carried in, and shows a state in which the sludge transfer hopper is detached from the sludge storage hopper.
[0019]
As shown in FIG. 1, the sludge transfer system of this embodiment is provided with a sludge storage hopper 2 and a sludge transfer hopper 3 in a sludge transfer area of a sludge treatment facility equipped with a dehydrator 1. In the present embodiment, the dehydrator 1 is disposed on the second floor of the sludge treatment facility, and the sludge discharge area is disposed on the first floor of the facility.
[0020]
The sludge storage hopper 2 is provided in the ceiling portion of the sludge discharge area through the duct 20 for introducing sludge from the dehydrator 1 on the second floor, and stores the sludge in the storage portion 21 for storing the introduced sludge. A pair of opening / closing sections 22 to be discharged (see FIG. 2).
[0021]
The sludge transfer hopper 3 is a facility for transferring the introduced sludge out of the system. Here, the sludge is transferred to a heating (drying / carbonizing) treatment facility.
[0022]
FIG. 3 is a schematic view of the sludge transfer hopper and shows a form in which sludge is introduced from the sludge storage hopper 2. The sludge transfer hopper 3 includes a storage unit 30 that stores the sludge transferred from the sludge storage hopper 2, and a transfer unit 31 that discharges the sludge in the storage unit 30. A seal 34 is provided at the upper edge of the reservoir 30 so as to be airtightly connected to the lower edge of the reservoir 21 of the sludge storage hopper 2.
[0023]
The transfer means 31 includes a pump. The pump may be any pump that can discharge sludge. For example, there is a known Mono pump. Further, a pipe 310 is connected to the transfer means 31, and further a valve means (hereinafter referred to as V01) is connected thereto. And flexible piping 311 is suitably connected to V01 so that removal work becomes easy. At this time, the valve means (hereinafter referred to as V02) is also connected to one end of the flexible pipe 310 connected to V01, thereby preventing sludge from flowing out of the pipe 310 when the flexible pipe 310 is removed from V01. Yes. Further, when sludge is transferred to a separate heat treatment facility, a pipe 312 for transferring sludge to the heat treatment facility is connected to the flexible pipe 311 as shown in FIG.
[0024]
Further, the sludge transfer hopper 3 includes a plurality of lifting means 32 and wheels 33 as appropriate, and the installation position of the storage unit 30 is movable in the vertical direction and the horizontal direction. Examples of the lifting means 32 include a hydraulic jack. Thus, by making the installation position of the storage unit 30 flexible, it is easy to guide the storage unit 30 to the storage unit 21 when the sludge is introduced from the sludge storage hopper 2.
[0025]
On the other hand, when the sludge in the sludge storage hopper 2 is carried out by truck, as shown in FIG. 2, after the sludge transfer hopper 3 is detached from the sludge storage hopper 2 by the lifting means 32, V01 and V02 are closed. After confirming that it exists, the flexible piping 311 is removed from V01. Next, the sludge transfer hopper 3 is moved by a hawk lift or the like (for example, moved to the dotted line portion shown in the figure) to secure a truck loading space. As a result, the sludge stored in the sludge storage hopper 2 can be carried out of the system by the truck.
[0026]
FIG. 4 is a schematic view showing an embodiment of a heat treatment facility equipped with the sludge transfer system of the present invention.
[0027]
The drying furnace 4 is means for drying the sludge supplied from the sludge transfer hopper 3 through the pipe 312 (see FIG. 1). At this time, the sludge is quantitatively supplied while being measured by the measurement supply means 402.
[0028]
FIG. 5 is a schematic view showing an embodiment of the metering means.
[0029]
The weighing supply unit includes a storage hopper 91 for temporarily storing the workpiece, a weighing unit 92 for weighing the workpiece, and a control unit 93 for controlling these operations.
[0030]
Here, between the storage hopper 91 and the weighing unit 92, a pipe conveyor 911 for conveying the workpiece is installed. The pipe conveyor 911 is provided with a discharge port 912 for guiding the object to be processed to the measuring unit 92 and a drive source 913. The pipe conveyor 911 is airtightly connected to the measuring unit 92 by the flexible cover 914.
[0031]
The weighing unit 92 includes a weighing hopper 921. The weighing hopper 921 includes a weighing sensor 922 and valve means (hereinafter referred to as V1), to which valve means (hereinafter referred to as V2) is connected via a flexible joint 923. The valve means (hereinafter referred to as V3) is further connected to V2 via a joint 924. V1, V2 and V3 open and close based on a control signal from the control means 93. The weighing hopper 921 is appropriately provided with a buffer tank on the workpiece supply side.
[0032]
The heat treatment furnace (for example, the drying furnace 2) to which the object to be treated is supplied restricts the introduction of air and sucks and discharges the generated water vapor and pyrolysis gas, so that the inside of the furnace has a negative pressure. . Accordingly, it is difficult for the weighing hopper 921 to accurately measure under the influence of the negative pressure. Therefore, the weighing unit 92 has a configuration in which V1 is connected to the workpiece discharge side of the weighing hopper 921, a flexible joint 923 is connected thereto, and V1, the joints 924, and V2 are assembled. It is possible to perform accurate weighing.
[0033]
The weighing sensor 922 is a sensor that measures the mass of the workpiece introduced into the weighing hopper 921. Examples of the weighing sensor 922 include a load cell. The mass measured by the weighing sensor 922 is supplied to the control means 93 as a measurement signal.
[0034]
The control means 93 has a storage and calculation processing function, and controls the operations of V1, V2, V3 and the drive source 913 by calculation processing based on the measurement signal supplied from the measurement sensor 922. An example of operation control will be described below.
[0035]
At the time of weighing, V1, V2, and V3 are controlled to be closed. In this state, an object to be processed (for example, about 2 kg) is supplied to the weighing hopper 921 by the pipe conveyor 911 by operating the drive source 913 for a predetermined time (for example, 20 seconds). Thereafter, the drive source 913 is stopped, and the input of the workpiece is interrupted. Here, the weighing sensor 922 measures the filling amount (for example, mass) of the input workpiece. The measured value is supplied to the control means 93, integrated and stored. Thereafter, V1 and V2 are controlled to be opened, and the measured workpiece is moved into the joint 924. Next, V1 and V2 are controlled to be closed and V3 is controlled to be opened, and the workpiece in the joint 924 is introduced into a heat treatment furnace such as a drying furnace. In addition, the control means 93 can calculate the volume (m ³ / day) of sludge to be processed per day by measuring the filling amount of the workpiece introduced into the hopper 921 with a level sensor or the like.
[0036]
FIG. 6 shows an example of controlling the integrated processing amount of the object to be processed per hour.
[0037]
Figure shows the relationship between the input amount and the processing amount set value of the object in a case where the set value W _S of the processing amount per unit time was 180 kg / hr. The horizontal axis represents time T, and the vertical axis represents the processing amount W per unit time. A indicates the input amount (reference amount) per time, 2A indicates the second time, and nA indicates the n-th time input and the integrated amount (dotted line). As shown in the figure, when the integrated processing amount does not reach the set value at the time of the input nA, the input of the workpiece is continued, but when the set value is exceeded at the next input, it does not become one hour. in t _1, introduction of the treatment object is aborted. Then, at t ₂ after one hour has elapsed, the input of the workpiece is started again.
[0038]
In FIG. 4, the metering supply means 402 supplies the sludge to the drying furnace 4 so as to be less than 10 m ³ / day. For example, a fixed amount is supplied so that the flow rate of sludge is less than 0.4 m ³ / hour and about 360 to 400 kg / hour in terms of weight. In this way, the drying furnace 6 ensures the grasp of the processing amount, stabilizes the heat treatment, and simplifies the legal procedure as a drying facility.
[0039]
Next, the drying furnace 4 employs a rotary kiln system, a rotatable rotary furnace 41, a gas duct formed on the outer periphery of the rotary furnace 41, and external heating means for introducing hot air gas to heat the rotary furnace 41 from the outside. A heating jacket 42, a plurality of support rollers 410 that rotatably support the rotary furnace 41 at both ends, and a driving means 411 that rotationally drives the rotary furnace 41. The hot air gas is introduced from a hot air furnace 54 described later.
[0040]
The rotary furnace 41 is provided with a supply port for carrying a workpiece on one end side and a discharge port on the other end side, and a plurality of feed blades for stirring and transporting the conveyed product are provided inside the rotary body 41. . Then, the object to be processed supplied from the supply duct 40 is introduced into the rotary furnace 41 from the supply port side, and the rotation of the rotary furnace 41 enables transfer to the discharge port side while stirring the object to be processed. I am letting. In addition, the supply duct 40 is provided with a hopper facility 401 for feeding an object to be processed.
[0041]
The pyrolysis furnace 5 is a means for pyrolyzing the sludge dried in the drying furnace 4, adopts a rotary kiln system, has the same configuration as the drying furnace 4, and includes a rotary furnace 41 and a heating jacket 42. .
[0042]
The drying furnace 4 and the pyrolysis furnace 5 are arranged so that the supply port of the pyrolysis furnace 4 communicates with the discharge port of the drying furnace 4 as illustrated. At this time, the discharge port of the drying furnace 4 and the supply port of the pyrolysis furnace 5 are provided with a communication duct 50 that covers and communicates with the discharge port and the supply port. The communication duct 50 is provided with a crushing means 501 for crushing the object to be processed dried in the drying furnace 5 and a metering supply means 504 for measuring and supplying the object to be disintegrated to the thermal decomposition furnace 5. .
[0043]
The crushing means 501 is provided in the duct 50 via flexible joints 502 and 503. The crushing means 501 includes a pair of rotating bodies in a cylindrical body into which an object to be processed is introduced. And sludge is squeezed by inserting sludge between rotating bodies having different rotation directions and squeezing. Although not shown, a guide plate for guiding the sludge to the crushing means 501 is appropriately provided on the sludge supply side of the crushing means 501.
[0044]
The weighing supply unit 504 is the same as the weighing supply unit 402. The metering means conveys the sludge to the pyrolysis furnace 5 so that the amount of sludge treated is less than 200 kg / hour, for example. Thus, by setting the amount of sludge input to the pyrolysis furnace 5 to be less than 200 kg / hour, the pyrolysis furnace 5 has a stable heat treatment and a simple legal procedure as an incineration facility. It becomes.
[0045]
The hot air furnace 54 is a means for supplying hot air gas, and includes a combustion burner 540 for generating hot air gas. First, the hot air gas is supplied to the heating jacket 52 of the pyrolysis furnace 5 to heat the rotary furnace 51 and then supplied into the heating jacket 42 of the drying furnace 4 to heat the rotary furnace 41. The hot air gas discharged from the heating jacket 42 is exhausted, but a part of the gas is used as an ejector driving gas in the gas combustion furnace 7.
[0046]
The hot air gas is injected with temperature adjusting air, and the gas temperature is adjusted appropriately. For example, in the drying furnace 4, it adjusts so that the rotary furnace 41 may be heated at 200-500 degreeC. At this time, the temperature in the rotary furnace 41 is heated to about 100 to 150 ° C. by evaporation of the contained water. On the other hand, in the pyrolysis furnace 5, the rotary furnace 51 is heated at about 350-600 degreeC. In this way, the sludge introduced into the drying furnace 4 is dried by indirect heating. Further, the sludge introduced into the pyrolysis furnace 5 is pyrolyzed by indirect heating. The dry matter and carbide obtained in the drying furnace 4 and the pyrolysis furnace 5 can be reused as raw materials such as a soil conditioner, snow melting agent, ice melting agent, flocculant, adsorbent, etc. It is a means for pulverizing and collecting the obtained carbide. The pulverizing / transferring means 6 includes a screw that is driven by a drive source M having a variable rotation speed in a cylinder 61 that conveys a conveyed product (carbide). The cylinder 61 is accompanied by a cooling jacket 62, and the carbide is pulverized and transferred while being cooled. The cooling jacket 62 is provided with a refrigerant exemplified by air, water, and the like.
[0047]
The gas combustion furnace 7 uses the steam generated in the drying furnace 4 and the pyrolysis gas generated in the pyrolysis furnace 5 under a certain atmosphere and residence time (for example, in an atmosphere of about 850 ° C. for 2 seconds or more). Residence time) Combustion and detoxification treatment. Water vapor and pyrolysis gas are introduced by ejector blowers 542 and 543 via paths 507 and 508. At this time, air is appropriately introduced into any gas to be treated from outside the system.
[0048]
The gas combustion furnace 7 includes a gas combustion chamber for burning the introduced gas. In the gas combustion chamber, water vapor and pyrolysis gas are introduced through ejectors 71a and 71b, respectively, and mixed and burned by the combustion burner 70. At this time, when the pyrolysis gas is sufficiently generated, the combustion by the combustion burner 70 is appropriately limited by narrowing the supply of fuel. The gas burned in the gas combustion furnace 7 was cooled to about 200 to 150 ° C. by a gas-gas heat exchange type heat exchanger 8 using air as a cooling medium, and further supplied to a bag filter 81. Thereafter, the blower 82 opens the chimney 83 to the atmosphere. The air heated in the heat exchanger 8 is used for generating hot air gas in the hot air furnace 54.
[0049]
【The invention's effect】
As is clear from the above description, the present invention has the following effects.
[0050]
In the sludge treatment system according to claims 1 and 2, since the sludge transfer hopper is detachably provided in the existing facility, there is no need to modify or change the facility. This makes it possible to carry out any sludge treatment such as transporting dewatered sludge to a new heat treatment facility or carrying out sludge by truck during maintenance inspection of the heat treatment facility without stopping the dewatered sludge from the dehydrator. It becomes. In addition, in the existing sludge treatment facility, by installing a heat treatment facility to which sludge is provided via a sludge transfer hopper, it is possible to process the sludge at the sludge generation source.
[0051]
The heat treatment facility according to claims 3 to 6 includes the sludge transfer system, so that the existing sludge can be dried and further thermally decomposed. Since processing is possible, it is possible to perform sludge treatment at a lower cost than when sludge is transported out of the facility and processed. Moreover, since the dry matter and carbide obtained by the drying treatment and the pyrolysis treatment can be used as effective resources, it is not necessary to incinerate or landfill sludge, and a more inexpensive sludge treatment can be performed.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an embodiment of a sludge transfer system according to the present invention.
FIG. 2 is a schematic view showing an embodiment of a sludge transfer system according to the present invention.
FIG. 3 is a schematic view of a sludge transfer hopper.
FIG. 4 is a schematic view showing an embodiment example of a heat treatment facility equipped with the sludge transfer system of the present invention.
FIG. 5 is a schematic view showing an embodiment example of a metering supply means.
FIG. 6 is an explanatory diagram showing an example of control execution of the control means.
FIG. 7 is a schematic view of a conventional sludge transfer system.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Dehydrator 2 ... Sludge storage hopper, 20 ... Duct, 21 ... Storage part, 22 ... Opening / closing part 3 ... Sludge transfer hopper, 30 ... Storage part, 31 ... Transfer means, 32 ... Lifting means, 33 ... Wheel, 34 ... Seals, 310, 312 ... piping, 311 ... flexible piping, V01, V02 ... valve means 4 ... drying furnace 5 ... pyrolysis furnace, 501 ... crushing means 6 ... grinding transfer means 7 ... gas combustion furnace 8 ... heat exchanger 402 Measured supply means 502 Measured supply means 91 Storing hopper 911 Pipe conveyor 912 Discharge port 913 Drive source 914 Flexible cover 92 Measuring unit 921 Measuring hopper 922 Measuring sensor 923 ... Flexible joint, 924 ... Joint, 93 ... Control means, V1, V2, V3 ... Valve means

Claims (6)

On the sludge discharge side of the existing sludge storage hopper, a sludge transfer hopper that transfers the sludge received from this hopper out of the system is detachable,
The sludge transfer hopper is provided with a transfer means for transferring the sludge to a remote place. 2. The sludge transfer system according to claim 1, wherein the sludge transfer hopper includes lifting means and wheels, and is movable in a vertical direction and a horizontal direction. A sludge heat treatment facility equipped with a sludge transfer system for transferring sludge received from an existing sludge storage hopper,
The sludge transfer system is detachably equipped with a sludge transfer hopper that transfers sludge received from the hopper to a remote place on the sludge discharge side of the sludge storage hopper,
The sludge transfer hopper is provided with transfer means for transferring the sludge to a heat treatment furnace provided in the heat treatment facility. 4. The sludge heat treatment facility according to claim 3, wherein the heat treatment furnace includes a drying furnace for drying the sludge supplied from the sludge treatment system. 5. The sludge heat treatment facility according to claim 4, wherein the heat treatment furnace includes a pyrolysis furnace for pyrolyzing the sludge supplied from the drying furnace. Provided on the workpiece supply side of the drying furnace or pyrolysis furnace, and after adding up the amount of workpieces to be measured and integrated, a certain amount of sludge is supplied to the drying furnace and pyrolysis furnace based on the integration result. The sludge heat treatment facility according to any one of claims 3 to 5, further comprising a metering supply means.

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