JP2004114004A - Sludge transfer system and sludge heat treatment facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To supply a sludge cake to the following step without stopping a sludge treatment system. <P>SOLUTION: The sludge discharge side of an existing sludge storage hopper 2 is provided with a freely attachable and detachable sludge transfer hopper 3 for transferring the sludge accepted from the hopper to a remote place 3. The hopper 3 is provided with a transfer means for the sludge. The hopper 3 includes a lifting means 32 and wheels 33 and is freely movable in vertical and horizontal directions. The sludge is transferred through flexible piping 311 and piping 312 to a remote heat treatment facility. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
It relates to a sludge transfer system and a sludge heat treatment (drying, pyrolysis) facility. In particular, it is a sludge transfer system suitable for heating dehydrated sludge generated in sewage treatment facilities and factories in the facility. It relates to a heat treatment facility for sludge.
[0002]
[Prior art]
FIG. 6 is a schematic diagram of a conventional sludge transfer system, showing a form of release of dehydrated sludge in a sewage treatment plant, for example.
[0003]
The hydrated sludge generated in the sewage treatment plant is usually subjected to dehydration treatment in the dehydrator 1, for example, to a water content of about 85%. The dewatered sludge is temporarily stored in a sludge storage hopper 2 (for example, 5 to 10 m ³ ), and then periodically guided to a lower part of the sludge storage hopper 2 to carry out a sludge discharge truck 10. The lower opening / closing part 22 is opened, and is transferred to the truck 10. The dehydrated sludge is usually carried out of the facility by a truck 10 or the like, and is then provided for incineration or landfill. Alternatively, for example, drying treatment and carbonization treatment in a heat treatment facility have been attempted.
[0004]
[Problems to be solved by the invention]
In the existing sludge treatment facility, when drying and further carbonizing the dewatered sludge, the sludge will be taken out from the existing sludge discharge port and transported.How to transport this sludge to the drying device and carbonizing device It is important to configure.
[0005]
For example, when inspecting the drying and carbonizing equipment, equipment related to these equipment will be stopped for a certain period of time. It is necessary to keep.
[0006]
At this time, there is a method of processing the hopper and installing a carry-out pump. However, it is difficult to stop the dewatered sludge from the dehydrator, so that it is difficult to install a discharge pump.
[0007]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a sludge transfer system and a sludge heating treatment facility that can provide dehydrated sludge to the next step without stopping a 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 according to claim 1 is characterized in that a sludge transfer hopper for transferring sludge received from this hopper to a remote place is detachably provided on the sludge discharge side of the existing sludge storage hopper, and the sludge transfer hopper is configured to transfer the sludge out of the system. And a transfer means for transferring to
[0010]
The invention according to claim 2 is the sludge transfer system according to claim 1,
The sludge transfer hopper is characterized by comprising lifting means and wheels, and being movable vertically and horizontally.
[0011]
The invention according to claim 3 is a sludge heating treatment facility provided with a sludge transfer system that transfers sludge received from an existing sludge storage hopper,
The sludge transfer system includes, on the sludge discharge side of the sludge storage hopper, a detachable sludge transfer hopper for transferring the sludge received from the hopper to a remote place,
The sludge transfer hopper is provided with 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, the heat treatment furnace includes a pyrolysis furnace for thermally decomposing the sludge supplied from the drying furnace.
[0014]
According to a sixth aspect of the present invention, in the sludge heat treatment facility according to any one of the third to fifth aspects, the sludge heat treatment facility is provided on the side of the drying furnace or the pyrolysis furnace on the supply side of the object to be treated, and the object to be treated is charged. After the amount is measured and integrated, a metering / supplying unit is provided for supplying a fixed amount of sludge to each of the drying furnace and the pyrolysis furnace based on the integrated result. Here, the input amount means mass or volume.
[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 remodel or change the facility. This allows any sludge treatment, such as transferring sludge to a new heat treatment facility or carrying out sludge by truck during maintenance and inspection of the heat treatment facility, without stopping the sludge from the dehydrator. It becomes. In addition, by installing a heat treatment facility in which sludge is provided via a sludge transfer hopper in an existing sludge treatment facility, sludge processing at a sludge generation source becomes possible.
[0016]
By providing the sludge transfer system as in the heat treatment facility according to claims 3 to 6, the existing sludge can be dried and further thermally decomposed, and sludge generation at the sludge generation source can be performed. Since the processing can be performed, the sludge treatment can be performed at a lower cost than in the case where the sludge is carried out outside the facility and treated as in the related art. In addition, since the dry matter and the carbide obtained by the drying and thermal decomposition treatments can be used as effective resources, there is no need to incinerate or reclaim the sludge, so that a more inexpensive sludge treatment can be performed.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0018]
1 and 2 are schematic diagrams showing an embodiment of the sludge transfer system of the present invention. In particular, FIG. 1 shows an embodiment in which the received sludge is transferred to a heat treatment facility, and shows a state in which a sludge transfer hopper is mounted on a sludge storage hopper. FIG. 2 shows an embodiment in which a truck is carried in, and shows a state in which a sludge transfer hopper is detached from a sludge storage hopper.
[0019]
As shown in FIG. 1, the sludge transfer system of the present embodiment includes a sludge storage hopper 2 and a sludge transfer hopper 3 in a sludge transfer area of a sludge treatment facility provided 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 same facility.
[0020]
The sludge storage hopper 2 is provided on a ceiling of a sludge discharge area through a duct 20 for introducing sludge from the dewatering machine 1 on the second floor, and stores a sludge in the sludge in the storage unit 21 for storing sludge introduced therein. And a pair of opening / closing portions 22 for discharging (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 / carbonization) treatment facility.
[0022]
FIG. 3 is a schematic diagram of a sludge transfer hopper, and shows a form in which sludge is introduced from a 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. In addition, a seal 34 is provided on the upper edge of the storage unit 30 so that the lower edge of the storage unit 21 of the sludge storage hopper 2 can be connected in an airtight manner.
[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 a valve means (hereinafter, referred to as V01) is connected thereto. A flexible pipe 311 is appropriately connected to V01 so as to facilitate the removal operation. At this time, by connecting a valve means (hereinafter, referred to as V02) to one end of the flexible pipe 310 connected to V01, it is possible to prevent sludge from flowing out of the pipe 310 when the flexible pipe 310 is removed from V01. I have. Further, when the sludge is transferred to a remote heat treatment facility, a pipe 312 for transferring the 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. As described above, by setting the storage position of the storage unit 30 freely, it is easy to guide the storage unit 30 to the storage unit 21 when 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 there is, the flexible pipe 311 is removed from V01. Next, the sludge transfer hopper 3 is moved by a forklift or the like (for example, moved to a dotted line portion in the drawing) to secure a truck carrying space. Thereby, 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 diagram showing one embodiment of a heat treatment facility provided with the sludge transfer system of the present invention.
[0027]
The drying furnace 4 is a means for drying the sludge supplied from the sludge transfer hopper 3 via the pipe 312 (see FIG. 1). At this time, the sludge is quantitatively supplied while being measured by the measuring and supplying means 402.
[0028]
FIG. 5 is a schematic diagram showing one embodiment of the metering means.
[0029]
The metering / supplying unit includes a storage hopper 91 for temporarily storing the object to be processed, a measuring unit 92 for measuring the object to be processed, and a control unit 93 for controlling the operation of these.
[0030]
Here, between the storage hopper 91 and the weighing section 92, a pipe conveyor 911 for transporting the workpiece is provided. The pipe conveyor 911 is provided with a discharge port 912 for guiding the object to be processed to the measuring section 92, and is provided with a drive source 913. The pipe conveyor 911 is air-tightly connected to the measuring section 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. Further, valve means (hereinafter, referred to as V3) is 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 measuring hopper 921 is appropriately provided with a buffer tank on the processing object supply side.
[0032]
The heat treatment furnace (for example, the drying furnace 2) to which the treatment object is supplied restricts the introduction of air and sucks and discharges generated steam and pyrolysis gas, so that the inside of the furnace has a negative pressure. . Therefore, it is difficult for the weighing hopper 921 to measure accurately under the influence of the negative pressure. Therefore, the measuring section 92 connects the V1 to the object discharge side of the measuring hopper 921, connects the flexible joint 923 to the V1, connects the V1, the joint 924, and the V2, thereby forming the object to be processed. Enables accurate weighing.
[0033]
The weighing sensor 922 is a sensor that measures the mass of the processing target introduced into the weighing hopper 921. The weighing sensor 922 includes, for example, 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 arithmetic processing function, and controls operations of V1, V2, V3 and the drive source 913 by arithmetic processing based on the measurement signal supplied from the weighing sensor 922. An operation control example 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 certain time (for example, 20 seconds). After that, the driving source 913 is stopped, and the charging of the object is interrupted. Here, the weighing sensor 922 measures the amount (for example, mass) of the charged object to be processed. The measured value is supplied to the control means 93, where it is integrated and stored. Thereafter, V1 and V2 are controlled to open, and the weighed workpiece moves into the joint 924. Next, V1 and V2 are controlled to be closed, and V3 is controlled to be opened, and the object in the joint 924 is introduced into a heat treatment furnace such as a drying furnace. The control means 93 can calculate the volume of sludge to be treated per day (m ³ / day) by measuring the amount of the object to be treated introduced into the hopper 921 with a level sensor or the like.
[0036]
FIG. 6 shows an example in which the integrated processing amount of the processing object per hour is controlled.
[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 indicates the time T, and the vertical axis indicates the processing amount W per unit time. A indicates the input amount per reference (reference amount), 2A indicates the second input, and nA indicates the n-th input and the integrated amount of each (dotted line). As shown in the drawing, if the integrated processing amount is less than the set value at the time of the input nA, the input of the processing object is continued, but if the set value is exceeded at the next input, the time does not reach one hour. in t _1, introduction of the treatment object is aborted. Then, at 1 hour after t _2, introduction of the treatment object is started again.
[0038]
In FIG. 4, the metering / supplying unit 402 supplies the sludge to the drying furnace 4 so as to be less than 10 m ³ / day. For example, the sludge is supplied at a constant flow rate of less than 0.4 m < ³ > / hour and about 360 to 400 kg / hour in terms of weight. As described above, in the drying furnace 6, the amount of treatment can be reliably grasped, the heat treatment is stabilized, and the legal procedure as a drying facility is simplified.
[0039]
Next, the drying furnace 4 employs a rotary kiln system, a rotatable rotary furnace 41 and 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 plurality of support rollers 410 for rotatably supporting the rotary furnace 41 at both ends, and a driving unit 411 for driving the rotary furnace 41 to rotate. The hot-air gas is introduced from a hot-air furnace 54 described later.
[0040]
The rotary furnace 41 is provided at one end with a supply port for loading a workpiece, and at the other end with a discharge port, and is provided with a plurality of feed blades inside the rotating body 41 for stirring and transporting the transported material. . Then, the workpiece 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 allows the workpiece to be transferred to the discharge port while stirring the workpiece. Let me. Further, the supply duct 40 is provided with a hopper facility 401 for charging the object to be processed.
[0041]
The pyrolysis furnace 5 is a means for pyrolyzing 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 such that the supply port of the pyrolysis furnace 4 communicates with the discharge port of the drying furnace 4 as illustrated. At this time, a communication duct 50 is provided at the discharge port of the drying furnace 4 and the supply port of the pyrolysis furnace 5 so as to cover and communicate with the discharge port and the supply port. The communication duct 50 is provided with a crushing unit 501 for crushing the object to be dried which has been subjected to the drying treatment in the drying furnace 5, and a metering / supplying unit 504 for supplying the crushed object to the pyrolysis furnace 5. .
[0043]
The crushing means 501 is provided on 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. Then, sludge is inserted between rotating bodies having different rotation directions from each other and pressed to crush pulverized dried sludge. 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]
As the measuring and supplying unit 504, the same as the measuring and supplying unit 402 is employed. The metering means conveys the sludge to the pyrolysis furnace 5 so that the sludge treatment amount is, for example, less than 200 kg / hour. As described above, by setting the amount of sludge introduced into the pyrolysis furnace 5 to be less than 200 kg / hour, the pyrolysis furnace 5 has a stable heat treatment and has a simple legal procedure as an incineration facility. It becomes.
[0045]
The hot blast stove 54 is a means for supplying hot blast gas, and includes a combustion burner 540 for generating hot blast gas. The hot blast gas is first supplied to the heating jacket 52 of the pyrolysis furnace 5, and after heating the rotary furnace 51, is 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 supplied with air for temperature adjustment, and the gas temperature is appropriately adjusted. For example, in the drying furnace 4, adjustment is performed so that the rotary furnace 41 is heated at 200 to 500 ° C. At this time, the temperature inside the rotary furnace 41 is heated to about 100 to 150 ° C. due to evaporation of the contained water. On the other hand, in the pyrolysis furnace 5, the rotary furnace 51 is heated at about 350 to 600 ° C. Thus, the sludge introduced into the drying furnace 4 is dried by indirect heating. Moreover, the sludge introduced into the pyrolysis furnace 5 is subjected to a pyrolysis process by indirect heating. The dry matter and carbonized material obtained in the drying furnace 4 and the pyrolysis furnace 5 can be reused as raw materials such as a soil conditioner, a snow melting agent, an ice melting agent, a flocculant, and an adsorbent. This is a means for crushing and collecting the obtained carbide. The crushing and transferring means 6 includes a screw driven by a driving source M having a variable rotation speed in a cylindrical body 61 for conveying a conveyed material (carbide). The cylindrical body 61 is provided with 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 converts the steam generated in the drying furnace 4 and the pyrolysis gas generated in the pyrolysis furnace 5 under a constant atmosphere and a residence time (for example, in an atmosphere of about 850 ° C. for 2 seconds or more). (Residence time) Burn and detoxify. Steam and pyrolysis gases are introduced by ejector blowers 542, 543 via paths 507,508. At this time, air is appropriately introduced into any of the gases to be processed 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, steam and pyrolysis gas are introduced through ejectors 71a and 71b, respectively, and mixed and burned by a combustion burner 70. At this time, when the pyrolysis gas is sufficiently generated, the combustion by the combustion burner 70 is appropriately restricted by restricting the fuel supply. 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 air is released from the chimney 83 to the atmosphere by the blower 82. 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 remodel or change the facility. As a result, any sludge treatment is possible without stopping the dewatering sludge from the dewatering machine, such as transferring the dewatered sludge to a new heat treatment facility or carrying out sludge by truck during maintenance and inspection of the heat treatment facility. It becomes. In addition, by installing a heat treatment facility in which sludge is provided via a sludge transfer hopper in an existing sludge treatment facility, sludge processing at a sludge generation source becomes possible.
[0051]
The heat treatment facility according to claims 3 to 6 is provided with the sludge transfer system, so that the existing sludge can be dried and further thermally decomposed, and the sludge generated at the sludge generation source can be treated. Since the processing can be performed, the sludge treatment can be performed at a lower cost than in the case where the sludge is carried out outside the facility and treated as in the related art. In addition, since the dry matter and the carbide obtained by the drying treatment and the thermal decomposition treatment can be used as effective resources, there is no need to incinerate or reclaim the sludge, so that a more inexpensive sludge treatment can be performed.
[Brief description of the drawings]
FIG. 1 is a schematic diagram 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 diagram of a sludge transfer hopper.
FIG. 4 is a schematic diagram showing an embodiment of a heat treatment facility provided with the sludge transfer system of the present invention.
FIG. 5 is a schematic view showing an example of an embodiment of a metering / supplying unit.
FIG. 6 is an explanatory diagram showing a control execution example of a control unit.
FIG. 7 is a schematic diagram 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 ... Wheels, 34 ... Seals, 310, 312: piping, 311: flexible piping, V01, V02: valve means 4, drying furnace 5, pyrolysis furnace, 501, crushing means 6, crushing transfer means 7, gas combustion furnace 8, heat exchanger 402 ... Measurement supply means, 502 ... Measurement supply means, 91 ... Storage 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 for transferring the sludge received from this hopper to the outside of the system is detachably provided,
A sludge transfer system, wherein the sludge transfer hopper includes transfer means for transferring the sludge to a remote place. The sludge transfer system according to claim 1, wherein the sludge transfer hopper includes a 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 includes, on the sludge discharge side of the sludge storage hopper, a detachable sludge transfer hopper for transferring the sludge received from the hopper to a remote place,
The sludge heat treatment facility, wherein the sludge transfer hopper includes a transfer means for transferring the sludge to a heat treatment furnace provided in the heat treatment facility. The sludge heat treatment facility according to claim 3, wherein the heat treatment furnace includes a drying furnace for drying sludge supplied from the sludge treatment system. The sludge heat treatment facility according to claim 4, wherein the heat treatment furnace includes a pyrolysis furnace that thermally decomposes the sludge supplied from the drying furnace. Each of the drying furnace and the pyrolysis furnace is provided on the supply side of the material to be processed, and after measuring and integrating the amount of the material to be processed, a certain amount of sludge is supplied to each of the drying furnace and the 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 / supplying unit that performs the measurement.

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