JPH08197099A - Sludge drier - Google Patents

Abstract

PURPOSE: To make a drier compact and to reduce the power consumption by weighing the sludge concd. in a centrifugal concentrator, sending the weighed sludge under pressure to a centrifugal thin-film drier by a line mixer, measuring the torque during the transportation and controlling the revolving speed of a sludge pump with the measured weight and torque. CONSTITUTION: Sludge is supplied to a centrifugal concentrator 3 from a raw liq. sludge tank 1 through a sludge feed pump 2 and concd. The concd. sludge is weighed by a load cell 5, introduced into a line mixer 6 from a hopper 4 and sent to a centrifugal thin-film drier 10. The torque at the drying part 7 of the line mixer is detected by a torque detector 8. The weight weighed by the load cell 5 and the torque detected by the detector 8 are inputted to a control circuit 30, and the revolving speed of the pump 2 is controlled by the control circuit 30 based on the detected weight and torque.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge drying device for drying sludge discharged from water treatment facilities, chemical industry, industrial waste treatment facilities and the like.

[0002]

2. Description of the Related Art As a conventional sludge drying device, a device as shown in FIG. 3 is known.

In FIG. 3, the sludge stored in the sludge stock solution tank 1 is supplied to a centrifugal concentrator 3 by a sludge feed pump 2. After being centrifugally concentrated by the centrifugal concentrator 3, it is kneaded by a concentrated sludge liquid feed feeder 19 attached to the lower part of the centrifugal concentrator 3, and is supplied to the centrifugal thin film dryer 10 from a sludge inlet nozzle 9 by a concentrated sludge liquid feed pump 20. To be done.
In the centrifugal thin film dryer 10, sludge is dispersed along the inner surface of the heat transfer cylinder 13 by the dispersion ring 12 attached to the rotating main shaft 11. The dispersed sludge is further made into a thin film by the blade 14 attached to the lower part of the dispersion ring 12, and is efficiently dehydrated and dried by the heating steam supplied to the heating steam jacket 15 provided outside the heat transfer cylinder 13. Is done. Reference numeral 16 is an electric motor that rotates a main shaft.

[0004]

In the conventional sludge dryer, the concentrated sludge feed feeder becomes overtorque due to the fluctuation of the concentrated sludge solid content concentration, or the discharge pressure of the concentrated sludge feed pump is increased to increase the concentrated sludge. There was a problem that it could not be pumped well.

The present invention has been made in view of the above circumstances, and by using a line mixer in a pipe for feeding sludge concentrated by a centrifugal concentrator to a centrifugal thin film dryer, a concentrated sludge liquid supply device becomes unnecessary, and the device It is an object of the present invention to provide a sludge drying device capable of downsizing and reducing power consumption.

[0006]

The sludge drying apparatus of the present invention comprises a sludge feed pump for feeding sludge stored in a sludge stock solution tank to a centrifugal concentrator, and a concentrated sludge kneaded at the bottom of the centrifugal concentrator. Hopper, a load cell installed in the hopper for measuring the weight of the concentrated sludge, a line mixer for pressure-feeding the concentrated sludge to the centrifugal thin film dryer, a torque detector for detecting the torque generated in the drive part of the line mixer, and a torque A control circuit for controlling the amount of liquid supplied by the sludge liquid supply pump based on the amount of torque output from the detector and the weight of concentrated sludge output from the load cell. Further, in the sludge drying device of claim 2, the line mixer for pressure-feeding the concentrated sludge to the centrifugal thin film dryer is a double pipe, and the heated steam used in the centrifugal thin film dryer is supplied to the double pipe to perform residual heat. It has a feature.

[0007]

In the sludge drying apparatus of the present invention, the sludge stored in the sludge stock solution tank is sent to the centrifugal concentrator by the sludge feed pump, the popper is attached to the lower part of the centrifugal concentrator to knead the concentrated sludge, and then to the hopper. The load cell is equipped to measure the weight of the concentrated sludge, the concentrated sludge is pressure-fed to the centrifugal thin film dryer by the line mixer, the torque generated in the drive part of the line mixer is detected, and the torque amount output from the torque detector and the load cell are detected. It is characterized in that the rotation speed of the sludge feed pump is controlled by the output weight of the concentrated sludge. Further, in the sludge drying device of claim 2, the line mixer for pressure-feeding the concentrated sludge to the centrifugal thin film dryer is a double pipe, and the heated steam used in the centrifugal thin film dryer is supplied to the double pipe to perform residual heat. It has a feature.

[0008]

EXAMPLE Next, an example of the sludge drying apparatus of the present invention will be described. In FIG. 1, a sludge feed pump 2 is a pump that sends out the sludge stored in the sludge stock solution tank 1 to a centrifugal concentrator 3. The hopper 4 is attached to the lower part of the centrifugal concentrator 3 to drop concentrated sludge, and the load cell 5 is connected to the hopper 4
Is installed to measure the weight of the concentrated sludge. Further, the line mixer 6 pressure-feeds the concentrated sludge to the centrifugal thin film dryer 10,
The torque detector 8 is a drive unit 7 that drives the line mixer 6.
The torque generated at is detected. Then, the control circuit 30 controls the amount of torque output from the torque detector 8 and the weight of the concentrated sludge output from the load cell 5 to feed the sludge feed pump 2
Control the rotation speed of.

That is, in FIG. 1, the sludge stored in the sludge stock solution tank 1 is supplied to a centrifugal concentrator 3 by a sludge feed pump 2. After being centrifugally concentrated by the centrifugal concentrator 3, the mixture is kneaded by a hopper 4 attached to the lower part of the centrifugal concentrator 3, and a sludge inlet nozzle 9 is provided by a line mixer 6.
It is supplied to the centrifugal thin film dryer 10. In the centrifugal thin film dryer 10, sludge is dispersed along the inner surface of the heat transfer cylinder 13 by the dispersion ring 12 attached to the rotating main shaft 11. The dispersed sludge is further made into a thin film by the blade 14 attached to the lower part of the dispersion ring 12, and is efficiently dehydrated and dried by the heating steam supplied to the heating steam jacket 15 provided outside the heat transfer cylinder 13. Is done. Reference numeral 16 is an electric motor that rotates a main shaft.

A small hopper 4 is provided at the outlet of the centrifugal concentrator 3.
Is attached to the hopper 4, and the hopper 4 is equipped with a load cell 5 for detecting the weight of the concentrated sludge in the hopper. The centrifugal concentrator 3 is connected to the centrifugal thin film dryer 10 via a line mixer 6. Centrifugal thin film dryer 1
The dispersion ring 1 is attached to the main shaft 11 arranged in the heat transfer cylinder 13
2 and blade 14 are attached. A heating steam jacket 15 is provided outside the heat transfer cylinder 13 of the centrifugal thin film dryer 10. Reference numeral 16 is an electric motor for rotating the main shaft 16, and 2 is a sludge feed pump for supplying sludge from the sludge stock solution tank 1 to the centrifugal concentrator 3.

Next, the operation of this embodiment will be described.

As shown in FIG. 1, sludge is supplied from a sludge stock solution tank 1 to a centrifugal concentrator 3 via a sludge supply pump 2. The concentrated sludge concentrated in the centrifugal concentrator 3 enters the hopper 4 at the outlet of the centrifugal concentrator, and is sent to the centrifugal thin film dryer 10 via a line mixer 6 equipped with a drive unit 7. The discharge amount of the sludge supply pump 2 is controlled by the torque of the drive unit 7 of the load cell 5 and the line mixer 6 attached to the hopper 4. Therefore, the line mixer 6
Can supply the concentrated sludge to the centrifugal thin film dryer 10 in a fixed amount.

The concentrated sludge thus concentrated in the centrifugal concentrator 3 first enters the hopper 4 attached to the outlet of the centrifugal concentrator. In order to quantitatively supply the concentrated sludge to the centrifugal thin film dryer 10, it is necessary that the hopper 4 does not become empty and always stores a certain amount or more of the concentrated sludge. Of the sludge feed pump 2 is controlled by detecting the weight of the
The discharge amount of the sludge feed pump 2 is controlled by detecting the torque in the drive unit 7 of the line mixer 6 so that the concentrated sludge amount does not become excessively overloaded. Further, by using the line mixer 6, the conventional concentrated sludge feed liquid feeder and concentrated sludge feed liquid pump are not required, and the device can be made compact. In addition, power consumption can be reduced accordingly.

Next, an embodiment of claim 2 will be described with reference to FIG.

FIG. 2 shows a double tube 17 used as the line mixer 6 of the sludge drying apparatus shown in FIG. 1, and the heating steam B used in the centrifugal thin film dryer 10 is supplied to the double tube 17 for residual heat. Is characterized by. Then, the heating steam jacket 15 of the centrifugal thin film dryer 10 is attached to the annular portion of the double pipe 17.
The heating steam B discharged from the heating steam jacket 15 is supplied to the heating steam B after being used for indirect drying of the sludge. The concentrated sludge concentrated by the centrifugal concentrator 3 is preheated when passing through the double pipe 17. Further, since the concentrated sludge passes through the line mixer, it is always preheated at a uniform temperature. Double tube 1
A thickened sludge thermometer is attached to 7, and controls the supply amount of steam so that the thickened sludge does not overheat. A is the supplied steam, and C is the exhausted steam.

As another embodiment, a screw conveyor or the like can be used instead of the line mixer.

[0017]

Since the sludge drying device of the present invention is configured as described above, the number of constituent devices can be reduced as compared with the conventional device, the device can be made compact, and the conventional concentrated sludge feeder can be consumed. Power consumption can be reduced. In addition, energy efficiency when drying sludge can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a sludge drying device showing an embodiment of the present invention.

FIG. 2 is a sectional view showing an embodiment of claim 2.

FIG. 3 is a cross-sectional view of a conventional sludge drying device.

[Explanation of symbols]

 2 ... Sludge feed pump 3 ... Centrifugal concentrator 4 ... Hopper 5 ... Load cell 6 ... Line mixer 7 ... Drive unit 8 ... Torque detector

Claims (2)

[Claims] 1. A sludge feed pump for delivering sludge stored in a sludge stock solution tank to a centrifugal concentrator, and a hopper attached to the lower part of the centrifugal concentrator for kneading the concentrated sludge.
A load cell that is provided in the hopper to measure the weight of the concentrated sludge, a line mixer that pressure-feeds the concentrated sludge to a centrifugal thin film dryer, and a torque detector that detects a torque generated in a drive unit of the line mixer, A sludge drying device, comprising: a control circuit that controls a liquid supply amount by the sludge liquid supply pump according to a torque amount output from a torque detector and a concentrated sludge weight output from the load cell. 2. A line mixer for pressure-feeding the concentrated sludge to a centrifugal thin film dryer is a double tube, and the heating steam used in the centrifugal thin film dryer is supplied to the double tube for residual heat. The sludge drying device according to claim 1.