JP3202289B2 - Centrifugal dehydrator with chemical injection rate control unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a chemical injection rate control unit for separating sludge into solid and liquid to form a separated liquid and a dewatered cake.
It relates centrifugal de MizuSo location to.

[0002]

2. Description of the Related Art FIG. 2 is a longitudinal sectional view showing an example of a conventional centrifugal dehydrator. In FIG. 2, reference numeral 1 denotes a centrifugal dehydrator, and this centrifugal dehydrator 1 comprises an outer shell 2 and an inner shell 3. ing. 4 sludge tank, the chemical tanks 5, 6 sludge pump for guiding the sludge in the sludge tank 4 to the mixing tank 7, 8 with a chemical pump for guiding the medicine in the medicine tank 5 to the mixing tank 7, the mixing vessel 7 Mixes sludge and chemicals. Reference numeral 9 denotes a chemical injection rate control unit for controlling the chemical injection rate by measuring the viscosity of the sludge from the sludge tank 4 and the floc sludge from the mixing tank 7. This chemical injection rate control unit 9 comprises a viscometer 10 and a valve unit. 11 and a controller 12.

In the centrifugal dehydrator 1 having such a structure, sludge is supplied to a viscometer 10 by a sludge pump 6 and mixed with the viscometer 10.
The floc sludge from the tank 7 is supplied to the viscometer 10 to measure the viscosity of the sludge and the floc sludge, and the controller 12 controls the chemical injection amount of the chemical pump 8. That is, the torque measured by the viscometer 10
Control. While controlling Such controller 12 dosing amount in the supplies the sludge in the sludge tank 4 to the mixing tank 7 by the sludge pump 6, mixing tank chemicals in chemical tank 5 by means of chemicals pump 8 7 For sludge dewatering.

FIG. 3 shows, for example, Japanese Patent Application Laid-Open No. 60-2064.
58 is a longitudinal sectional view showing a conventional centrifugal dehydrator disclosed in Japanese Patent Application Laid-Open No. 58-63, Japanese Patent Application Laid-Open No. 63-319075, etc. In FIG. 13 is provided, and a separated liquid outlet 14 is provided at the other large-diameter end 2b. The inner body 3 is provided with an inflow pipe 15 for supplying a liquid A to be treated such as sludge, and a screw 16 and an outflow hole 17 for supplying a treatment liquid as a chemical.
Are provided.

[0005] A drive pulley 19 interlocked with a main motor 18 is attached to one shaft of the outer shell 2.
On the other shaft, a gear mechanism 20 including a planetary gear and the like connected to the inner body 3 is arranged. The outer shell 2 is rotated by a main motor 18, and this rotation is transmitted to the inner shell 3 via a gear mechanism 20. The inner trunk 3 rotates in the same direction as the outer trunk 2 with a slight rotation difference. Reference numeral 21 denotes a differential speed motor that changes depending on the type of sludge and the amount of solids in the pool, 22 denotes a detector that detects the current value of the differential speed motor 21, and 23 denotes a current value detected by the detector 22 and a predetermined range set in advance. , And controls the rotation of the differential speed motor 21 so as to approximate the set value. The control means 24 includes the differential speed motor 21, the detector 22, and the rotation controller 23. .

Next, the operation will be described. The liquid A to be treated such as sludge flowing into the inner body 3 from the inflow pipe 15 is supplied from the outflow hole 17 into the outer body 2 as shown by an arrow, where it is separated into solid and liquid by centrifugal force. Then, the separated liquid overflows and is discharged from the separated liquid discharge port 14 at one end. The precipitate is scraped to the other end by the screw 16 and discharged from the solid discharge port 13 as a dehydrated cake. Further, the detector 22 detects the current value of the differential speed motor 21 and controls the rotation of the differential speed motor 21 to a value within a predetermined range by the control means 24 so as to always obtain the optimum differential speed. A dehydrated cake having a low water content can be obtained while the amount of the deposited material can be optimally maintained.

[0007]

SUMMARY OF THE INVENTION A conventional chemical injection rate control unit
Since Tsu centrifugal de MizuSo location having the door is constructed as described above, in a manner that centrifugal dehydration using a mixed tank 7 shown in FIG. 2 is disadvantageously Kusurichuritsu increases.

In the in-machine injection method shown in FIG. 3, floc sludge is formed inside the centrifugal dewatering machine when sludge is dewatered.
There was a problem that floc sludge could not be taken out.

[0009] The present invention has been made to solve the above problems, as well as to avoid creating floc sludge centrifugal dehydrator outer section, always optimal to avoid many chemical feeding, chemical dosing amount and to obtain a centrifugal de MizuSo location with Kusurichuritsu control unit solid-liquid separation in the state is to allow.

[0010]

[Means for Solving the Problems] A drug injection rate system according to the present invention.
Centrifugal de MizuSo location with control unit calculates the flow rate of the sludge and chemicals supplied to the centrifugal dehydrator by the flow ratio calculation unit, sludge and chemicals are supplied on the basis of the flow ratio stirred in a mixing tank The sludge is flocculated as a result, the viscosity of the flocculated floc sludge is measured by a viscometer, and the chemical injection amount of the centrifugal dehydrator is controlled based on the viscosity of the floc sludge measured by the viscometer. It has a controller that performs

[0011]

[Action] <br/> centrifugal de MizuSo location with Kusurichuritsu control unit in the present invention calculates the flow rate of the sludge and chemicals supplied to the centrifugal dehydrator, the sludge and chemicals on the basis of the flow ratio To the mixing tank . The floppy was flocculated by stirring the sludge and chemicals in a mixing tank
The sludge viscosity is measured, and the chemical injection amount of the centrifugal dehydrator is controlled based on this viscosity.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing one embodiment of the present invention.
1, the same or equivalent components as those in FIGS. 2 and 3 are denoted by the same reference numerals, and redundant description will be omitted. In the drawing, reference numeral 25 denotes a chemical injection rate control unit. The chemical injection rate control unit 25 controls the chemical injection rate of the chemical pump 8, a mixing tank 26 for stirring and mixing sludge and chemicals, and a sludge and floc. It comprises a viscosity measuring device 27 for measuring the viscosity with sludge, and an automatic valve unit 29 for controlling the opening and closing of an automatic valve 28 provided in the chemical injection rate control unit 25. Reference numeral 30 denotes a sludge sample pump that supplies sludge to the mixing tank 26, 31 denotes a chemical sample pump that supplies a chemical to the mixing tank 26, and 32 denotes a flow rate calculator that controls the chemical sample pump 31. The flow ratio between the amount of sludge supplied from the sludge tank 4 to the centrifugal dehydrator 1 and the amount of the chemical supplied from the chemical tank 5 to the centrifugal dehydrator 1 is calculated. 33 is a sludge flow meter and 34 is a chemical flow meter.

Next, the operation will be described. They crowded set the Kusurichuritsu control unit 25 to the centrifugal dehydrator 1, centrifugal dehydrator 1
The flow rates of the sludge and the chemical supplied to are measured by the sludge flow meter 33 and the chemical flow meter 34, respectively, and the flow ratio calculator 32 calculates the flow ratio of the sludge and the chemical. And the sludge sample pump 30 and the chemical sample pump 3
Using 1, the sample is sent to the mixing tank 26 so that the flow ratio is the same, and the chemical is stirred in the sludge. The floc sludge is formed in the mixing tank 26 in this manner, and the viscosity of the floc sludge that has been spliced to form a floc is measured by the viscometer 27 to determine the chemical injection rate in the centrifugal dewatering machine 1 by the sludge pump 6.
And the chemical pump 8 is controlled to match the flow rate ratio. That is, if the viscosity of the floc sludge is high, the amount of the chemical is reduced, and if the viscosity of the floc sludge is low, the amount of the chemical is controlled to be increased, so that the amount of the chemical is not too large, and the solid-liquid separation can always be performed in an optimal state. To

[0014]

As described above, according to the present invention , the flow ratio between the sludge and the chemical supplied to the centrifugal dehydrator is calculated by the flow ratio calculator, and the sludge and the chemical supplied based on this flow ratio are calculated. The sludge is flocculated by being stirred in the mixing tank, the viscosity of the flocculated floc sludge is measured by a viscometer, and a centrifugal dehydrator is used based on the viscosity of the floc sludge measured by the viscometer. chemical feeding, chemical dosing rate control uni having a controller for controlling the chemical feeding, chemical dosing amount
Since it is configured to have a Tsu bets, without making flocs sludge centrifugal dehydrator outer portion, moreover not many chemical feeding, chemical dosing amount,
There is an effect that solid-liquid separation can always be performed in an optimal state.

[Brief description of the drawings]

FIG. 1 is a chemical injection rate control unit according to an embodiment of the present invention.
It is a schematic view showing a centrifugal de MizuSo location with.

2 is a schematic diagram showing an example of a centrifugal de-MizuSo <br/> location having conventional Kusurichuritsu control unit.

FIG. 3 is a schematic configuration diagram showing an example of a conventional centrifugal dehydrator.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-34097 (JP, A) JP-A-2-261600 (JP, A) JP-A 62-171799 (JP, A) JP-A 61-161 257300 (JP, A) Japanese Utility Model Showa 60-67200 (JP, U) Japanese Utility Model Showa 62-140436 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) C02F 11/14 B04B 15 / 00

Claims (1)

(57) [Claims] 1. A centrifugal dewatering machine to perform the dehydration of sludge by injecting chemicals into the interior, the flow rate ratio calculation unit for calculating a flow ratio of the sludge and chemicals supplied to the centrifugal dehydrator, the flow rate ratio A mixing tank to which sludge and chemicals are supplied based on the flow ratio calculated by the computer
Click, floppy was full locked reduction stirred at this mix tank
Viscosity measuring device for measuring the viscosity of a click sludge, and drugs having a controller for controlling the chemical feeding, chemical dosing amount of the centrifugal dehydrator based on the viscosity of the floppy click sludge measured by the viscosity measuring instrument
Chemical feeding, chemical dosing rate system characterized by comprising a Note rate control unit
Centrifugal de MizuSo location with control unit.