JP2856275B2 - Centrifuge cleaning equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for cleaning a centrifuge, and more particularly, to an apparatus for efficiently cleaning the inside of a centrifuge having a separating plate.

[0002]

2. Description of the Related Art Separating plate centrifuges have a high acceleration (G) due to high-speed rotation and a large sedimentation area. Therefore, they are suitable for separating and removing fine particles in a liquid with high accuracy, and are used in many industrial fields. In particular, it is widely used for refining fuel oil and lubricating oil of marine diesel engines. The centrifugal separator according to the present invention is a centrifugal separator in which, as shown in FIG. 1, a multiplicity of frustum-conical metal thin plates are stacked in a rotating bowl in the axial direction of the rotating bowl. Means the machine.

In order to increase the sedimentation area as described above, a separation plate type centrifuge is provided with a large number of truncated conical separation plates stacked with a small gap of 1 mm or less. Afterwards, sticky sludge and agglomerated particles in the treated oil adhere to the gaps in the separator, so
Approximately once, it is removed by washing using a washing liquid mainly containing a neutral detergent or the like.

[0004] The applicant of the present invention has previously described the Japanese Utility Model Application
No. 5 proposed an apparatus capable of automatically cleaning the centrifuge of this separator type. In addition to this, Japanese Patent Publication No. 4-66616 has been proposed as a washing apparatus for a separator centrifuge. Subsequently, as a result of diligent studies of these devices, the present applicant has found that there are the following problems.

That is, in the former case, the cleaning liquid is drawn out of the tank by a cleaning liquid circulation pump provided near the cleaning liquid tank, and the cleaning liquid is centrifugally separated from the stock solution supply port of a centrifugal separator of a separating plate type. I have been forced into the cabin. The cleaning liquid passes between the rotating separation plates, and is discharged from the light liquid discharge port and the heavy liquid discharge port while cleaning the attached matter.
It returns to the washing liquid tank via a pipe and is used for circulation.

In the latter case, the cleaning liquid is drawn out from the cleaning liquid tank by the cleaning liquid circulation pump and sent to the centrifugal separator, and the discharge pressure of the heavy liquid and light liquid impellers of the centrifugal separator is increased. The washing is performed by increasing a circulating amount by circulating a part of the cleaning liquid discharged from the heavy liquid discharge port and the light liquid discharge port together with the discharge liquid of the cleaning liquid circulation pump.

[0007] In any of the above cleaning apparatuses, it is necessary to install a circulating pump for the cleaning liquid, which increases the equipment cost and requires a place for installing the pump and its electric motor. It is customary that there is no room in places such as engines and auxiliary equipment, and it is a problem that a valuable place is occupied by equipment that is used only once a month. Furthermore, it is necessary to install electric system equipment such as a control panel for the driving motor, which is a problem in terms of equipment cost.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and does not require the installation of a cleaning liquid circulation pump, and also optimally controls the amount of circulation of the cleaning liquid. An object of the present invention is to provide a washing apparatus for a separation plate type centrifuge that can be used.

[0009]

According to a first aspect of the present invention, a cleaning liquid is introduced from a stock solution supply port of a centrifugal separator, and a discharge port of the separated solution is a light liquid.
An apparatus for cleaning the inside of a separation plate type centrifugal separator by circulating a cleaning liquid discharged from a light liquid discharge port through a pipe line and comprising a discharge port, wherein a closed type cleaning liquid tank capable of being pressurized with a pressurized gas; A feed pipe for drawing out the cleaning liquid from the lower portion of the cleaning liquid tank and feeding the cleaning liquid to the undiluted liquid supply port, a return pipe connected to the light liquid discharge port to return the cleaning liquid to the cleaning liquid tank, and the feed pipe; A circulation pipe for connecting an intermediate portion of each return pipe to circulate the cleaning liquid discharged from the light liquid discharge port to the undiluted liquid supply port, and a gas pipe connected to the cleaning liquid tank for introducing a pressurized gas into the tank. Road and washing
Adjust the pressure in the cleaning solution tank with pressure gas to circulate the cleaning solution
A centrifugal separator washing device characterized by operating by controlling the flow rate , and the gist of claim 2 is as follows.
The washing liquid is introduced from the undiluted solution supply port of the separation plate type centrifuge,
The outlet for the separated liquid consists of a light liquid outlet and a heavy liquid outlet.
The cleaning liquid discharged from the liquid discharge port and heavy liquid discharge port is
To circulate and wash the inside of the separator centrifuge
, Closed-type cleaning liquid tank that can be pressurized with pressurized gas
And derive the cleaning liquid from the lower part of the cleaning liquid tank and
The feed line for feeding the undiluted liquid supply port and the light liquid discharge port
A return line for returning the washing solution to the washing solution tank;
Connect the outlet line of the heavy liquid discharge port to the return line, and
Connect the respective intermediate portions of the pipeline and the return pipeline to
Circulates the cleaning liquid discharged from the liquid discharge port to the undiluted liquid supply port
Connect to the circulation pipe and the cleaning liquid tank to
Gas line to be introduced into the cleaning liquid tank.
The pressure of the cleaning liquid is adjusted by the pressure gas to control the circulation flow rate of the cleaning liquid.
Cleaning apparatus for centrifugal separators,
You.

[0010]

When a pressurized gas is introduced into the cleaning liquid tank, the cleaning liquid in the cleaning liquid tank is fed under pressure from the undiluted liquid supply port of the centrifugal separator through the feed pipe. The cleaning liquid that has entered the machine is once guided to the lower portion of the separation plate layer by the guide cylinder, and then flows while moving up the gap between the rotating separation plates toward the inner diameter side, and cleans and removes attached sludge.

The sludge having a high specific gravity moves radially outward due to centrifugal force, accumulates in the separation chamber, and is discharged outside the machine by opening the valve cylinder after the completion of the washing operation. On the other hand, the cleaning liquid from which sludge has been removed enters the impeller chamber through the light liquid passage above the separation plate layer and is pumped out of the machine by the action of the centripetal pump type impeller. At this time, the discharge pressure of the impeller is determined by the following equation Is done. ^{P = γ / 2g × ω 2} (r 1 2 -r 2 2) ( Saburo Kamei al., Calculated to the theory of chemical-mechanical, industry books, p4
27, 1970) where P: discharge pressure, γ: liquid specific gravity, g: gravitational acceleration,
ω: angular velocity, r ₁ : impeller radius, r ₂ : liquid level radius in impeller chamber

As can be seen from FIG. 1, the discharge side of the impeller communicates with the feed pipe via the return pipe and the circulation pipe. Circulate in the mouth. At this time, the valve that enters the cleaning liquid tank in the return line is closed. Therefore, if the pressure in the cleaning liquid tank is increased to appropriately increase the amount of the cleaning liquid fed into the centrifugal separator from the feed pipe, the liquid level r in the impeller chamber can be increased.
₂ also moves to the inner diameter side, the discharge pressure P determined by the above equation also increases, and the circulation amount increases accordingly.

When the discharge pressure P of the impeller rises and the circulation amount of the cleaning liquid reaches a predetermined amount, the valve of the feed pipe is closed.
As a result, the washing liquid sent into the centrifugal separator is impeller → light liquid outlet →
Return line → Circulation line → Feed line → Stock solution supply port → Guide tube →
The inside of the centrifuge is washed by circulating through the separation plate layer → light liquid passage → impeller chamber → impeller path.

At this time, if the pressure of the cleaning liquid tank is increased, the discharge pressure of the impeller, which balances with the pressure, is also increased.
The circulation flow rate of the cleaning liquid can be increased. The above description of the operation is for the case of claim 1, but for claim 2
In the case of (1), the operation is the same except that the washing liquid flows out of the light liquid outlet and the heavy liquid outlet.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention having the above configuration and operation will be described with reference to the drawings. FIG.
Is a device configuration diagram when the separation plate type centrifuge has only a light liquid discharge port, and FIG. 2 is a device configuration diagram when the separation plate type centrifuge has a light liquid discharge port and a heavy liquid discharge port.

In FIG. 1, reference numeral 1 denotes a cylindrical airtight cleaning liquid tank, which is connected to a gas pipe 2 having a pressure control valve 2P and an opening / closing valve 2V at an upper portion thereof. A pressurized gas such as nitrogen is introduced and pressurized to a predetermined pressure. Numeral 3 is a feed line for feeding the washing liquid, one end of which is connected to the lower part of the washing liquid tank 1 and the other end of which is connected to the undiluted solution supply port 11 of the centrifugal separator 10.
And a flow meter 3F.

Reference numeral 4 denotes a return line for the washing liquid, one end of which is connected to the light liquid outlet 12 of the centrifugal separator 10 and the other end of which is connected to the washing liquid tank 1, and a pressure gauge 4P and a valve for opening and closing. 4V. Reference numeral 5 denotes a circulation line for the cleaning liquid having one end connected to the intermediate portion of the return line 4 and the other end connected to the intermediate portion of the feed line 3, and includes a valve 5V for opening and closing.

In the present invention configured as described above, the valve 2V of the gas line 2 is opened to introduce the pressurized air into the cleaning liquid tank 1. At this time, the pressure in the cleaning liquid tank 1 is raised to a predetermined pressure and maintained by the pressure control valve 2P. Next, when the valve 3V of the feed pipe 3 is opened, the cleaning liquid in the cleaning liquid tank 1 is pressure-fed, and
From the centrifuge.

The washing liquid that has entered the centrifuge is separated from the guide cylinder 1
By 4, the sludge adhering to the separation plate is washed and removed while being guided to the lower part of the outer periphery of the separation plate layer 15 rotating at high speed and moving inward in the radial direction in the gap between the separation plates. Then, the removed sludge is accumulated in the separation chamber 17 at the outermost periphery of the rotary bowl 16 under the action of the centrifugal force, and is discharged outside the machine by opening the valve cylinder 18 after the cleaning operation. .

The washing liquid that has flowed to the inner diameter side in the gap between the separation plate layers 15 rises along the outer peripheral portion of the guide cylinder 14 and then moves to the light liquid passage 19.
, And flows into the impeller chamber 20. Then, the disc-shaped centripetal impeller, which is mounted stationary in the impeller chamber 20, enters the central portion from the outer peripheral edge, pressurizes under the action of the centripetal pump described above, and returns from the light liquid discharge port 12 to the return pipe 4. Discharged. At this time, since the valve 4V of the return line 4 is closed and the valve 5V of the circulation line 5 is open, the cleaning liquid is fed into the feed line 3 and circulated and supplied to the stock solution supply port 11.

In this manner, the cleaning liquid is circulated by skillfully utilizing the action of the centripetal impeller, and by increasing or decreasing the pressure of the cleaning liquid tank 1, the circulation amount of the cleaning liquid can be optimally controlled while observing the flow meter. Can control. It is also possible to mount the washing liquid tank on a cart and make it mobile so that it can be installed and operated near the centrifuge every time washing is performed.

The above embodiment is described with reference to the case of FIG. 1, but in the case of FIG. 2, the separation plate type centrifuge is of a three-phase separation type. Out of the heavy liquid discharge port 13 and the light liquid discharge port 12 for discharging the light liquid. If the heavy liquid discharge port 13 is connected to the return pipe 4 via the pipe 6, the same operation as in FIG. 1 can be obtained. However, since the light liquid impeller 21 and the heavy liquid impeller 22 have different discharge pressures, it is necessary to adjust the pressure using the valve 6V.

[0023]

According to the present invention having the above configuration and operation, the following effects can be obtained. (1) Since it is not necessary to install a circulation pump for cleaning liquid and its motor, it is possible to reduce equipment costs of cleaning equipment,
Valuable places around the centrifuge can be used effectively. (2) The circulation flow rate of the cleaning liquid can be easily adjusted to be optimal for the cleaning action only by increasing or decreasing the pressure for pressurizing the cleaning liquid tank. (3) Since there is no rotary drive part, maintenance of the apparatus can be saved.

[Brief description of the drawings]

FIG. 1 is an apparatus configuration diagram in a case where a separation plate type centrifuge is a two-phase separation type and a liquid phase outlet is only a light liquid outlet.

FIG. 2 is an apparatus configuration diagram in a case where a separation plate type centrifugal separator is a three-phase separation type and a liquid phase discharge port includes a light liquid discharge port and a heavy liquid discharge port.

[Explanation of symbols]

1; cleaning liquid tank, 2; gas line, 2P; pressure control valve,
2V; valve, 3; feed line, 3V; valve, 3F; flow meter,
4; return line, 4P; pressure gauge, 4V; valve, 5; circulating line, 5V; valve, 6; connecting line, 6V; regulating valve, 10; centrifugal separator, 11; , 12; light liquid outlet, 13; heavy liquid outlet, 14; guide cylinder, 15; separation plate layer, 16; rotating bowl, 17; separation chamber, 18; valve cylinder, 19; light liquid passage, 20; Chamber, 21; light liquid impeller, 22; heavy liquid impeller.

Continuation of the front page (56) References JP-A-1-224406 (JP, A) JP-A-57-156595 (JP, A) JP-A-4-122652 (JP, U) JP-B-4-66616 (JP) , B2) (58) Field surveyed (Int. Cl. ⁶ , DB name) B04B 15/06 B04B 1/08

Claims (2)

(57) [Claims] 1. A washing liquid is introduced from a stock solution supply port of a centrifugal separator of a separation plate type, a discharge port of the separation solution is constituted by a light liquid discharge port, and the washing liquid discharged from the light liquid discharge port is circulated through a pipe. A device for washing the inside of a separation plate type centrifugal separator, comprising: a closed-type cleaning liquid tank pressurizable with a pressurized gas; and a feed pipe for leading a cleaning liquid from a lower portion of the cleaning liquid tank and feeding the cleaning liquid to the stock solution supply port. A return line connected to the light liquid discharge port to return the cleaning liquid to the cleaning liquid tank; and a cleaning liquid discharged from the light liquid discharge port by connecting intermediate portions of the feed line and the return line. a circulation pipe for circulating the solution feed port and comprising a gas conduit for introducing a pressure gas into the tank and connected to the cleaning liquid tank, the pressure in the cleaning liquid tank
Operate by adjusting the pressure gas and controlling the circulation flow rate of the cleaning solution.
Cleaning apparatus of the centrifuge, characterized in that that. 2. Washing from a stock solution supply port of a separation plate type centrifuge.
The liquid is introduced, and the outlet for the separated liquid is the light liquid outlet and the heavy liquid outlet.
Cleaning consisting of light liquid outlet and heavy liquid outlet
The liquid is circulated through the pipe and the inside of the centrifuge
Closed washing that can be pressurized with pressurized gas in the washing equipment
The cleaning liquid is introduced from the cleaning liquid tank and the lower part of the cleaning liquid tank.
A feed line for taking out and feeding the undiluted solution supply port;
Return to the cleaning liquid tank by connecting to the discharge port
Connect the pipe and the outlet pipe of the heavy liquid discharge port to the return pipe
Then, the intermediate portions of the feed pipe and the return pipe are connected.
Subsequently, the cleaning liquid discharged from the light liquid discharge port is supplied as a stock solution.
Connected to the circulation line circulating in the mouth and the washing liquid tank
A gas line for introducing a pressurized gas into the tank;
Adjust the pressure in the cleaning solution tank with pressure gas to circulate the cleaning solution
A centrifuge characterized by operating with a controlled flow rate
Cleaning equipment.