JP2015145001A - Dry sludge moisture adjustment mechanism in sludge dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop a dry sludge moisture adjustment mechanism in a new sludge dryer, capable of realizing the mixture of sludge before being charged into the sludge dryer and dry sludge discharged from the sludge dryer, by an extremely simple configuration, and performing moisture adjustment of dry sludge.SOLUTION: A dry sludge moisture adjustment mechanism is a mechanism for obtaining moisture adjusted sludge M2 having a desired moisture content, by charging dewatered sludge M0 into an input port 51 in a sludge dryer 5, drying the sludge by the action of hot wind supplied from a hot wind suction port 53 followed by discharging as dry sludge M1 from a discharge port 52, and mixing the dry sludge M1 with the dewatered sludge M0 split before being charged into the input port 51. A transfer device 10 is provided with a transfer starting end facing the discharge port 52 in the sludge dryer 5, and the transfer device 10 is connected with a split flow passage 11 for supplying the dewatered sludge M0 split before being supplied to the input port 51.

Description

  The present invention relates to a sludge drier that handles an object to be treated having a high water content such as sludge. B. The dry sludge can be obtained at low cost and easily in a sludge drier in a sludge dryer.

Sludge (60% WB or more) generated in sewage treatment facilities, human waste treatment facilities, factory waste liquid treatment facilities, etc., after the water content has been reduced by an appropriate drying device (dry sludge), as industrial waste It will be disposed of in the final disposal site.
At this time, it is required to reduce transportation costs, and in Japan, where it is difficult to secure a disposal site, the moisture content of dry sludge is reduced as much as possible, and dry sludge is being reduced in volume. .
On the other hand, in countries other than Japan, transportation costs are not so high, and it is not uncommon for the disposal site to be easily secured. In this case, the moisture content of the dried sludge is approximately 40 to 60% W.W. B. If it is within the range, it can be discarded.
However, sludge is 40-60% W.V. B. When trying to discharge from the sludge dryer with a moisture content within the range of, the sludge in this state has high viscosity, so it may adhere to the transfer path, not be evenly discharged, There was a problem that the operating rate of the sludge dryer was lowered because the transfer speed was slow.
In general, the sludge has a relatively high fluidity when the water content is high, and becomes a granular material when the water content is low, and has high transportability.

Therefore, in reality, the sludge is dried to obtain a dry sludge having a low water content, and then the sludge having a desired water content is mixed with the sludge having a high water content. (For example, see Patent Document 1).
In order to realize such mixing, a mixer and a conveying means to the mixer are indispensable. Further, a hopper or the like is required for each conveying means in order to ensure quantitativeness. In some cases, it may be necessary to provide a flight conveyor or the like depending on the height limit of the factory.
The installation of such peripheral equipment for sludge dryers is somewhat free when constructing new facilities, but when modifying existing facilities, the initial cost may increase or the installation space may increase. There was also a situation where it was difficult to secure this.

JP-A-9-110666

  The present invention has been made from such a background, and the mixing of the sludge before being put into the sludge dryer and the dried sludge discharged from the sludge dryer is realized by an extremely simple equipment configuration and drying. It is a technical problem to develop a dry sludge moisture adjustment mechanism in a novel sludge dryer that can adjust the moisture content of sludge.

  In other words, the dry sludge moisture adjusting mechanism according to claim 1 inputs dehydrated sludge to the inlet of the sludge dryer, and dries it by the action of hot air supplied from the hot air inlet, and from the outlet as dry sludge. A mechanism for discharging and mixing the dried sludge with dewatered sludge that has been diverted before being introduced into the inlet, to obtain a moisture-adjusted sludge having a desired moisture content, wherein the sludge drying A transfer device is provided in such a manner that a transfer start end faces a discharge port in the machine, and further, a branch channel for supplying dewatered sludge before being supplied to the input port is connected to the transfer device. Is.

  Further, the dry sludge moisture adjusting mechanism according to claim 2 is characterized in that, in addition to the above requirements, the diversion channel is configured to be able to supply dehydrated sludge to the vicinity of the discharge portion in the transfer device. Is.

  Furthermore, the dry sludge moisture adjusting mechanism according to claim 3 is characterized in that, in addition to the above requirements, the discharge portion of the transfer device is configured to be located below the inlet in the sludge dryer. Is.

  Furthermore, the dry sludge moisture adjusting mechanism according to claim 4 is characterized in that, in addition to the above requirements, the transfer device is provided with a moisture meter between the connecting portion with the distribution channel and the discharging portion. It consists of.

  Furthermore, the dry sludge moisture adjusting mechanism according to claim 5 is characterized in that, in addition to the above requirements, the diversion channel and the transfer device are integrally configured.

Furthermore, the dry sludge moisture adjusting mechanism according to claim 6 is characterized in that, in addition to the above requirements, a supply device is provided in the branch flow path.
The above-described problems can be solved by using the inventions described in these claims as means.

  First, according to the first aspect of the present invention, the mixing of the dewatered sludge before being put into the sludge dryer and the dried sludge discharged from the sludge dryer is realized by an extremely simple equipment configuration, and a desired Moisture-adjusted sludge with a moisture content can be obtained.

  According to the second aspect of the present invention, adhesion of dewatered sludge to the transfer device can be suppressed to a minimum range.

  Furthermore, according to the invention of claim 3, the occupation area (occupied space) of the drying equipment including the dry sludge moisture adjusting mechanism can be minimized.

  Furthermore, according to the invention described in claim 4, it is possible to measure the moisture value of the moisture adjusting sludge and perform control to obtain a desired moisture content.

  Furthermore, according to the fifth aspect of the present invention, it is possible to easily attach the dry sludge moisture adjusting mechanism to the sludge dryer, and the installation cost can be significantly reduced. Moreover, it becomes possible to install a dry sludge moisture adjustment mechanism very easily and at low cost for a sludge dryer already installed in a factory.

  Furthermore, according to the sixth aspect of the present invention, it is possible to store the dewatered sludge before being charged into the transfer device, and avoid the shortage of supply of the dehydrated sludge to the transfer device.

It is a skeleton figure which shows the drying equipment comprised as a main member the sludge dryer provided with the dry sludge moisture adjustment mechanism of this invention. It is a three-view figure which shows the sludge dryer provided with the dry sludge moisture adjustment mechanism of this invention. It is a skeleton figure showing composition which enables selection of a supply destination of dehydrated sludge in a transfer device.

  The best mode of the dry sludge moisture adjustment mechanism (hereinafter referred to as the dry sludge moisture adjustment mechanism) in the sludge dryer of the present invention is as shown in the following embodiment, and further, the technical aspect of the present invention is compared with this embodiment. Changes can be made as appropriate within the scope of the idea.

What is schematically shown in FIG. 1 is a drying facility D composed mainly of a sludge dryer 5 provided with a dry sludge moisture adjusting mechanism 1 of the present invention, which includes a supply conveyor 2, hot air as peripheral devices. It comprises a furnace 3, a relay conveyor 6, and a control unit (not shown).
In the following description, what is generated at a sewage treatment facility, human waste treatment facility, factory waste liquid treatment facility, etc. is called sludge M (approximately 60% WB or more), and this is dehydrated by an appropriate dehydrator. The dehydrated sludge M0 (generally 80 to 85% WB) is called, and the one further dried by the sludge dryer 5 is called dry sludge M1 (generally 20 to 30% WB). The water whose water content is adjusted by the dry sludge water content adjusting mechanism 1 of the present invention will be referred to as water content control sludge M2 (40-60% WB).

Hereinafter, the members constituting the drying equipment D will be described in detail. First, the supply conveyor 2 will be described. This is provided with a screw conveyor 2a at the bottom of a box-shaped container, and discharges an appropriate amount of sludge M as an object to be dried accommodated in the container depending on the rotation state of the screw conveyor 2a.
In addition, a discharge port 2b is formed in the vicinity of the conveyance end of the screw conveyor 2a, and a diversion port 2c is formed in front of the discharge port 2b.

  Next, the hot stove 3 will be described. In this embodiment, the combustion chamber 30 and the burner 31 are provided as an example. The oil is burned in the burner 31 and the air is heated to dry hot air. Is generated.

  Next, the sludge dryer 5 will be described. In this embodiment, a rotary drum dryer is adopted as an example. In this apparatus, as shown in FIG. 2, four support rollers 57 are arranged with respect to the base B, a cylindrical drum 50 is placed on the support roller 57, and output shafts of the drum 50 and the motor 56 are arranged. Further, the chain 59 is wound around and the drum 50 is rotationally driven by the motor 56. A lifter 50c made of a plate-like member is provided on the inner surface of the drum 50 to scrape up an object to be dried.

Further, both ends of the drum 50 are closed with the boundary portions sealed by the lid members 50a and 50b. A shaft 55a provided so as to penetrate the vicinity of the center of the drum 50 is configured to be rotationally driven by a motor 56a. The shaft 55a includes a plurality of stirring blades 55.
The stirring blade 55 has an effect of crushing the object to be processed by the rotation of the drum 50 and also has an effect of crushing, thereby efficiently drying. Of course, the sludge dryer 5 having only a structure for scraping or dispersing the object to be processed, such as a structure including only the lifter 50c without the stirring blade 55, may be used.

A charging port 51a is formed in the charging device 51 provided in the upper part of the lid member 50a, and a hot air blowing port 53 is formed on the side surface of the lid member 50a. On the other hand, the discharge port 52 is formed in the lower part of the lid member 50b, and the exhaust port 54 is formed in the upper part.
In addition, the supply conveyor 2 is installed so that the discharge port 2 b faces the input port 51 a of the input device 51.

And the dry sludge moisture adjustment mechanism 1 of this invention is assembled | attached with respect to the above-mentioned sludge dryer 5 and its peripheral device, First, the transfer apparatus 10 makes the transfer start end face the discharge port 52 in the sludge dryer 5 first. Installed. In this embodiment, the relay conveyor 6 is provided between the discharge port 52 and the transfer device 10.
As the transfer device 10, for example, a screw conveyor is provided in the pipe, and the dried sludge M1 supplied into the pipe is sequentially discharged according to the rotation degree of the screw conveyor. Further, a part of the screw near the discharge unit 10a of the transfer device 10 may be replaced with a paddle.

In addition, a diversion channel 11 for supplying dewatered sludge M0 that has been diverted before being supplied to the input port 51a in the input device 51 to the transfer device 10 is connected. In this embodiment, the diversion channel 11 is connected. However, it shall be connected so that it may connect between the diversion port 2c in the supply conveyor 2, and the vicinity of the discharge part 10a in the transfer apparatus 10. FIG.
Here, the vicinity of the discharge unit 10a in the transfer device 10 is, for example, a portion of 500 to 1000 mm from the discharge unit 10a, and the drying sludge M1 and the dewatered sludge M0 in the transfer device 10 can be sufficiently mixed. It means an area closest to the discharge part 10a. When the dewatered sludge M0 is supplied to a portion closer to the discharge unit 10a than such a region, the dried sludge M1 and the dehydrated sludge M0 are not sufficiently mixed.

  In addition, as shown in FIG. 3, while providing the deflection plate 11a in the connection location of the diversion channel 11 and the transfer apparatus 10, this deflection plate 11a is connected to the rod of the air cylinder 11b through an appropriate link mechanism. As a result, the supply destination of the dewatered sludge M0 in the transfer device 10 can be selected within a certain range.

Furthermore, in this embodiment, the discharge unit 10a of the transfer device 10 is arranged to be positioned below the charging port 51 in the sludge dryer 5. That is, the transfer device 10 is arranged so that the discharge port 52 side of the sludge sludge dryer 5 is the transfer start end and the input port 51a side is the transfer end. Furthermore, the provision of the relay conveyor 6 makes it possible to install the transfer device 10 so as to be substantially parallel to the drum 50 as shown in the plan view of FIG. It is.
Due to such an installation mode, the diversion channel 11 and the transfer device 10 can be configured in a compact and integrated manner, and the dry sludge moisture adjusting mechanism 1 can be easily attached to the sludge dryer 5. And installation costs can be significantly reduced. Moreover, it becomes possible to install the dried sludge moisture adjusting mechanism 1 very easily and at low cost with respect to the sludge dryer 5 already installed in the factory.

An opening / closing mechanism 12 configured with an air cylinder or the like as appropriate is provided at a connection point between the diversion port 2c and the diversion channel 11 in the supply conveyor 2.
In addition, a moisture meter 13 is provided between the connection portion of the diversion channel 11 and the discharge portion 10 a in the transfer device 10, and a moisture meter 14 is further provided on the upstream side of the connection portion of the diversion channel 11.

  In addition, as shown by the phantom line in FIG. 1, you may make it provide supply apparatuses, such as the auxiliary conveyor 7 which provided the hopper part, with respect to the said branch flow path 11, In this case, to the transfer apparatus 10 It becomes possible to store the dewatered sludge M0 before being thrown in, and it is possible to avoid a shortage of supply of the dewatered sludge M0 to the transfer device 10.

The drying equipment D constituted by the sludge dryer 5 provided with the dry sludge moisture adjusting mechanism 1 of the present invention as a main member takes the form as described above as an example, and the operation of the drying equipment D will be described below. The action and effect of the dry sludge moisture adjusting mechanism 1 of the present invention will be described together with the above.
First, dewatered sludge M0 (generally 80 to 85% WB) is obtained by dewatering sludge M generated in a sewage treatment facility, human waste treatment facility, factory waste liquid treatment facility, and the like by an appropriate dewatering device. It is done.

Next, the dewatered sludge M0 is charged into the supply conveyor 2 and supplied into the drum 50 of the sludge dryer 5 through the charging device 51.
Then, the dewatered sludge M0 is stirred by the stirring blade 55 and further exposed to the hot air generated by the burner 31 while being swung up by the rotation of the drum 50, whereby the moisture is evaporated and the moisture content is lowered. It will be.

The dewatered sludge M0 thus dried by the sludge dryer 5 is discharged from the discharge port 52 as the dried sludge M1 (generally 20 to 30% WB), and is transferred to the transfer device 10 via the relay conveyor 6. It is thrown.
The moisture content of the dried sludge M1 is measured by the moisture meter 14, and the degree of solution of the opening / closing mechanism 12 is adjusted based on this value. To the transfer device 10.
The dewatered sludge M0 supplied to the transfer device 10 through the branch channel 11 is mixed with the dried sludge M1 by the action of a screw or paddle, and the moisture-adjusted sludge M2 having a desired moisture content (approximately 40 to 60% WB) and It is discharged from the discharge unit 10a and supplied to the next process.
At this time, since the diversion channel 11 is configured to supply the dewatered sludge M0 to the vicinity of the discharge portion 10a in the transfer device 10, the adhesion of the dewatered sludge M0 to the transfer device 10 is suppressed to a minimum range. However, the dehydrated sludge M0 and the dried sludge M1 are mixed well, and the moisture-adjusted sludge M2 having a uniform moisture content is obtained.

  In addition, since the transfer device 10 is provided with a moisture meter 13 between the connection portion with the branch channel 11 and the discharge portion 10a, the moisture content of the moisture adjusting sludge M2 located in the transfer device 10 is set. It is possible to perform control more complicatedly to achieve a desired moisture content, for example, by measuring and adjusting the opening degree of the switching device 12 together with the measurement result by the moisture meter 14.

DESCRIPTION OF SYMBOLS 1 Dry sludge moisture adjustment mechanism 10 Transfer apparatus 10a Discharge part 11 Divided flow path 11a Deflection plate 11b Air cylinder 12 Opening / closing mechanism 13 Moisture meter 14 Moisture meter 2 Supply conveyor 2a Screw conveyor 2b Discharge port 2c Split port 3 Hot air furnace 30 Combustion chamber 31 Burner 5 Sludge dryer 50 Drum 50a Lid member 50b Lid member 50c Lifter 51 Loading device 51a Loading port 52 Outlet port 53 Hot air blowing port 54 Exhaust port 55 Stirring blade 55a Shaft 56 Motor 56a Motor 57 Support roller 59 Chain 6 Relay conveyor 7 Auxiliary conveyor 8 Take-out conveyor B Base D Drying equipment M Sludge M0 Dehydrated sludge M1 Dry sludge M2 Moisture control sludge

Claims (6)

Dehydrated sludge is introduced into the inlet of the sludge dryer, dried by the action of hot air supplied from the hot air inlet, and discharged from the outlet as dried sludge. This is a mechanism for mixing the dewatered sludge that has been diverted before being processed to obtain a moisture-adjusted sludge having a desired moisture content, and the transfer device is arranged so that the transfer start end faces the discharge port in the sludge dryer. A drying sludge moisture adjusting mechanism in a sludge dryer, further comprising a branch passage for supplying dewatered sludge before being supplied to the charging port.
2. The dry sludge moisture adjusting mechanism in a sludge dryer according to claim 1, wherein the diversion channel is configured to be able to supply dehydrated sludge in the vicinity of a discharge portion in the transfer device.
The dry sludge moisture adjusting mechanism in the sludge dryer according to claim 1 or 2, wherein the discharge unit of the transfer device is configured to be positioned below a charging port in the sludge dryer.
The dry sludge moisture adjusting mechanism in a sludge dryer according to claim 1, 2 or 3, wherein the transfer device is provided with a moisture meter between the connecting portion with the distribution channel and the discharge portion. .
The dry sludge moisture adjusting mechanism in the sludge dryer according to claim 1, 2, 3, or 4, wherein the diversion channel and the transfer device are integrally configured.
  6. The dry sludge moisture adjusting mechanism in a sludge dryer according to claim 1, wherein a supply device is provided in the branch flow path.

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