JPH0422880Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a method for treating sludge with chemicals in order to improve the dewatering efficiency when the dewatered cake discharged from the primary dehydrator is supplied to the secondary dehydrator. Regarding a chemical mixer for secondary dehydration.

[Prior Art] A conventional chemical mixer only mixes the input dehydrated cake and the chemical. Therefore, if a chemical mixer is installed directly at the outlet of the primary dehydrator, the amount of chemical injection is constant, but the discharge of dehydrated cake from the primary dehydrator is not necessarily constant.
There was a problem where the drug injection rate fluctuated.

For this reason, a method has been adopted in which the dehydrated cake discharged from the primary dehydrator is temporarily stored in a hopper, and the dehydrated cake is quantitatively fed from the hopper into a chemical mixer using a quantitative feeder.

[Problems to be solved by the invention] However, when using the above method, two devices are required: a quantitative feeder and a chemical mixer.
There was a problem with the equipment being too large.

Therefore, the present invention was devised to solve the problems of the conventional technology, and its purpose is to be able to quantitatively cut out the dehydrated cake and mix it with chemicals using one device, thereby reducing the size of the device. An object of the present invention is to provide a chemical mixer for secondary sludge dewatering.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a storage hopper for storing the dehydrated cake from the primary dehydrator;
A chemical feeding processing chamber which processes the dehydrated cake and sends it to a secondary dehydrator is formed through a partition wall having an opening that communicates the two, and a storage hopper and a chemical feeding processing chamber are formed through the opening. A rotating shaft is straddled over the storage hopper, and a quantitative cutting screw is installed on the rotating shaft on the storage hopper side, and a stirring blade is installed on the rotating shaft on the chemical feeding processing chamber side, so that the dehydrated cake overflows into the chemical feeding processing chamber. It is characterized by forming a chute having a retention amount adjusting plate for discharging.

[Function] The rotation of the rotating shaft rotates the metered cutting screw and the stirring blade. As a result, the dehydrated cake stored in the storage hopper is quantitatively cut out by the screw into the chemical feeding processing chamber, mixed with the chemical to be quantitatively sprayed, and then supplied to the secondary dehydrator. . In particular, the storage hopper and the chemical injection processing chamber are partitioned by a partition plate having an opening that communicates them, and a quantitative cut-out screw is installed on the storage hopper side of the rotating shaft that is spanned through the opening. Since stirring blades are provided on the chamber side, the role sharing between the storage hopper and the chemical injection processing chamber is ensured, and uniform cutting and reliable mixing are achieved. In addition, since the chute formed in the chemical injection processing chamber has a retention amount adjustment plate that allows dehydrated cake to overflow and discharge, it is possible to arbitrarily adjust the retention amount or retention time of dehydrated cake depending on the kneading state. It becomes possible.

[Examples] Examples of the present invention will be described in detail below based on the accompanying drawings.

In Fig. 1, 1 is a casing whose top is open and whose bottom is semicircular in cross section, and inside the casing 1 is a storage hopper 2 that accommodates and stores the dehydrated cake discharged from the primary dehydrator. ,
It is partitioned off via a partition wall 4 into a chemical injection processing chamber 3 in which the dehydrated cake is subjected to chemical injection treatment.

The storage hopper 2 is placed in the casing 1.
A rotating shaft 5 is spanned over the and chemical injection processing chamber 3,
It is rotatably supported by bearings 6 and 7 mounted outside the casing 1. A motor M is connected to one end of the rotating shaft 5 via a reducer 8.

The partition wall 4 is formed with an opening 9 through which the rotating shaft 5 passes and for discharging the dehydrated cake from the storage hopper 2 to the chemical feeding processing chamber 3. A quantitative cutting screw 10 for cutting out the dehydrated cake into the chemical injection processing chamber 3 is installed on the rotating shaft 5 on the side of the storage hopper 2 from the partition wall 4, and the rotation shaft on the side of the chemical injection processing chamber 3 from the partition wall 4 A stirring blade 11 is attached to the shaft 5 to mix the cut-out dehydrated cake with chemicals.

The bottom portion 2a of the storage hopper 2 is formed to have a semicircular cross section so as to surround the screw 10, as shown in FIG.

The stirring blade 11 is connected to the rotating shaft 5 as shown in FIG.
formed into a two-piece fitting 12 that is attached to the
The nut 13 attached to the rotating shaft 5 is detachable from the rotating shaft 5, as shown in FIG.
It may be installed by screwing the threaded portion 14 at one end into the holder. The shape of the stirring blade 11 is a flat bar parallel to the rotating shaft 5 as shown in FIG. 5A, but it may also be slanted as shown in FIG. Note that the shape, number of attachments, interval between attachments, attachment angle, etc. of the stirring blades 11 can be changed as necessary, and for example, the number of attachments and the interval may be changed as shown in FIG. In the figure, A shows the case where strong stirring is required, B shows the case where the stirring is gradually weakened, C shows the case where reaction time is required rather than stirring, and D shows the case where the auxiliary stirring blade 15 is installed. . An auxiliary rotating shaft 16 to which an auxiliary stirring blade 15 is attached is connected to the rotating shaft 5 via gears 17 and 18.

In the chemical injection processing chamber 3, the partition wall 4 side is located upstream, and a chemical injection nozzle 19 for spraying chemicals is attached to this upstream portion. In addition, a retention amount adjusting plate 22 is detachably attached to the downstream part of the chemical injection processing chamber 3 with screws 23 to dam the dehydrated cake and cause the dehydrated cake to overflow from the sink portion 20 and the cutout portion 21. A chute 24 is formed to discharge the water.

Next, we will discuss the effect. The driving force of the motor M is transmitted to the rotating shaft 5 via the reducer 8, and the screw 10 and stirring blade 11, which are coaxial, rotate simultaneously.
A dehydrated cake having a moisture content of 75 to 90% is fed into the storage hopper 2 from the primary dehydrator and is quantitatively cut out from the opening 9 into the chemical injection processing chamber 3 by the rotation of the screw 10. Storage hopper 2 and quantitative cutting screw 1
0, even if the input amount of dehydrated cake varies, the dehydrated cake can be quantitatively cut into the chemical injection processing chamber 3 and chemicals can be mixed therein, and the chemical injection rate can be kept constant. I can do it.

The chemical from the chemical injection nozzle 19 is sprayed onto the dehydrated cake cut into the chemical injection processing chamber 3, and the dehydrated cake and the chemical are stirred and mixed by the rotation of the stirring blade 11 in the process of flowing from upstream to downstream. Ru. Then, this agitated and mixed dehydrated cake is transferred to the retention amount adjusting plate 22.
It overflows through the basin 20 and the notch 21, is discharged out of the casing through the chute 24, and is fed into the secondary dehydrator.

Since quantitative cutting and stirring are performed using one rotating shaft 5 in this way, it is possible to downsize the device, and the motor M,
One reducer 8 is sufficient, and if the amount of cutout is increased, the stirring speed will also automatically increase. In particular, the storage hopper 2 and the chemical injection processing chamber 3 are partitioned by a partition wall 4 having an opening 9 that communicates them, and the storage hopper side of the rotating shaft 5, which is suspended through the opening 9, has a fixed quantity cutout. Since the screw 10 is provided with the stirring blade 11 on the side of the chemical injection processing chamber, the role sharing between the storage hopper 2 and the chemical injection processing chamber 3 is ensured, and uniform cutting and reliable mixing are achieved.

Note that the upper open portion of the casing 1 may be covered with a lid if necessary.

The retention time of the dehydrated cake in the chemical injection processing chamber 3 is determined by the height of the groove 22 of the retention amount adjusting plate 22 and the notch 2.
It can be changed depending on the size of 1.

[Effects of the invention] In summary, the present invention provides the following excellent effects.

(1) The storage hopper and the chemical injection processing chamber are separated by a partition plate having an opening that communicates them, and a quantitative cutting screw is installed on the storage hopper side of the rotating shaft that is hung through the opening. Since a stirring blade is installed on the processing chamber side, the role sharing between the storage hopper and the chemical injection processing chamber is ensured.
Uniform cutting and reliable mixing are achieved. In addition, since the chute formed in the chemical injection processing chamber has a retention amount adjustment plate that allows dehydrated cake to overflow and discharge, it is possible to arbitrarily adjust the retention amount or retention time of dehydrated cake depending on the kneading state. can.

(2) Since quantitative cutting and stirring are performed using a single rotating shaft, only one motor and one reducer are required, allowing for a more compact device and a one-to-one correspondence between cutting speed and stirring speed. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing one embodiment of the present invention, Fig. 2 is an enlarged sectional view taken along the line A-A in Fig. 1, and Fig. 3 is a longitudinal sectional view showing an embodiment of the present invention.
FIG. 4 is a diagram showing the mounting structure of the stirring blade, FIG. 5 is a diagram showing the shape of the stirring blade, and FIG. 6 is a diagram showing an example of the arrangement of the stirring blade. In the figure, 1 is the casing, 2 is the storage hopper, and 3
1 is a chemical injection processing chamber, 5 is a rotating shaft, 10 is a quantitative cutting screw, and 11 is a stirring blade.

Claims (1)

[Scope of utility model registration request] A storage hopper that stores the dehydrated cake from the primary dehydrator and a chemical injection processing chamber that processes the dehydrated cake and sends it to the secondary dehydrator are formed through a partition wall having an opening that communicates them. , a rotating shaft passes through the opening and spans the storage hopper and the chemical injection processing chamber, and a metered cutting screw is installed on the rotational shaft on the storage hopper side, and a stirring shaft is installed on the rotational shaft on the chemical injection processing chamber side. A chemical mixer for secondary sludge dewatering, characterized in that a chute is provided with blades and has a retention amount adjusting plate for overflowing and discharging dehydrated cake into a chemical feeding processing chamber.