JPS60220157A - Centrifugal separation apparatus - Google Patents

Abstract

PURPOSE:To prevent inferiority, by making the lead-out free surface position of a treating solution and that of a detection solution same in a radius direction and mounting a flow amount detection means to a detection solution lead-out pipeline. CONSTITUTION:When oil A to be treated is introduced into a rotor 2 rotating several thousands rpm from a raw solution supply port 6, said oil A to be treated receives strong centrifugal force and separated into clean oil B and separated water or impurities D such as sludge when passes gaps of a laminated separation plate 10. Impurities D are accumulated in an impurities chamber 12 and the clean oil B is led out to the outside of the rotor 2 from a treated solution lead-out port 7. A part of the clean oil B flows through the gap flowline between a lead-out plate 11 and the rotor 2 as a detection solution C containing separation imperfect impurities and bypasses a regulation plate 9 to be led out to the outside of the rotor 2 from a detection solution lead-out port 8. The lead- out solution C is detected by an outflow amount detection means 3 before recirculated to the pipeline of the oil A to be treated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application) The present invention relates to a centrifugal separator that separates contaminants from a liquid to be processed using a centrifugal force trap of a rotating body incorporating a plurality of separation plates.

Prior art) Separator plate type centrifugal separators have high performance in separating impurities such as moisture and sludge mixed in the oil to be treated such as fuel oil and lubricating oil, and are easy to maintain and can be operated continuously. Therefore, it is widely used for cleaning the above oils. In ships in particular, the use of low-quality fuel oil has increased in order to reduce operating costs due to the soaring oil prices, and fuel oil is being used extensively for cleaning purposes. It is also used for other solid-liquid separations and liquid-liquid separations with differences in specific gravity. When using the above centrifugal separator as a three-layer separator (hereinafter referred to as a "purifier") that discharges clean oil (light oil), separated water (heavy liquid), and sludge as three layers when treating oil containing impurities. and clean oil (light liquid)
It is sometimes used as a two-layer separation device (hereinafter referred to as a clarifier) that discharges the clarifier and other impurities such as water and sludge in two layers.

In the former beulifier, since separated water can be continuously discharged, efficient KFi separation can be performed when the specific gravity of the oil to be treated is low and there is a difference in specific gravity from water. However, when the specific gravity of the oil (/l/<z℃) becomes as high as 0.9 g to 0.0 tatata, the separation interface inside the rotating body becomes unstable and the adjustment plate that adjusts the position of heavy liquid discharge from the rotating body must be replaced frequently. Moreover, there is a drawback that poor separation may occur due to fluctuations in specific gravity due to temperature changes or incorrect selection of adjustment plates. In the latter type of clarifier, the entire surface of the separation plate can be used effectively, so the separation effect is good, and there is no need for adjustment using a control plate, but the separated water cannot be continuously discharged and the water accumulates inside the rotating body. Since there is no appropriate means to detect the amount of accumulated contaminants such as separated water, if the amount of contaminants in the oil to be treated fluctuates, the discharge interval may become inappropriate, and the contaminant layer may exceed the allowable amount of the contaminant chamber. It has the disadvantage that it reaches the separation plate layer and significantly reduces the separation effect. The above is a case of impurity separation in oil, but the same applies to other liquid-liquid separations and solid-liquid separations.

Purpose of the Invention) The present invention has been made in view of the above circumstances, and eliminates the need for strict selection and frequent replacement of the adjustment plate of the conventional beulifier, and eliminates separation caused by fluctuations in the specific gravity of the liquid to be treated. The purpose of the present invention is to provide a device that can avoid defects as well as separation defects caused by contaminants accumulated in the rotating body of a conventional clarifier that exceed the allowable amount of the contaminant chamber. This is because, in a centrifugal separator that separates and processes a liquid to be processed using a rotary body that incorporates a plurality of separation plates, the free surface position 10 of the processing liquid and the free surface position dw of the detection liquid are approximately radially separated. The detection liquid lead-out conduit is equipped with an outflow amount detection means 3, and the detection means 3
This centrifugal separator is characterized in that it is equipped with a contaminant discharge valve control circuit which opens and closes the contaminant discharge valve j by the output of the centrifugal separator.

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Structure of the Invention) The present invention will be described below in detail based on drawings showing embodiments thereof.

FIG. 1 is a system diagram of an embodiment of the present invention, and FIG. 2 is a schematic enlarged view of essential parts of the rotating body section of FIG. 7.

/ is the main body of the centrifugal separator, 2 is a rotating body that has multiple separation plates and rotates at high speed, 3 is an outflow detection means such as a pressure switch or flow meter installed in the middle of the detection liquid outlet pipe, and g is the outflow amount A contaminant discharge valve control circuit that receives an output signal from the detection means and controls the opening and closing of the contaminant discharge valve, j is movable up and down relative to the working fluid tc such as water, and is opened and closed by various control circuits provided on an automatic operation panel (not shown). Controlled contaminant discharge valve,
B is a raw solution supply port located on the axis of the rotating body λ and supplies the liquid to be processed; 7 is a processing liquid outlet that separates impurities such as moisture and sludge and discharges the purified cleaning liquid; gFi is incomplete; The detection liquid outlet port for discharging a detection liquid such as a cleaning solution for separation is an adjustment plate that sets the free surface position of the detection liquid and ensures stable discharge of the liquid. When the free surface position of the processing liquid in the radial direction from the axis is dO, and the free surface position of the detection liquid is clw, the positional relationship between the two is approximately do=d.
Set w. In setting the above positions, the processing liquid outlet free surface position do can be set by the processing liquid outlet lower position or the inner diameter of the outlet plate //, and the detection liquid outlet free surface position dw can be set at the detection liquid outlet. It can be set by the g position or the inner diameter of the adjustment plate.

IO is a truncated cone-shaped separation plate that is laminated coaxially at equal intervals in the axial direction of the rotating body. This is a lead-out plate that extends from the outer circumference to the front and forms a detection liquid discharge flow path with a constant gap between it and the rotating body 2. 7.2 is a rotating body λ
The contaminant chamber /3 is located at the outermost periphery of the rotating body and accumulates contaminants such as moisture and sludge. /3 is located at the outermost periphery of the rotating body and is opened and closed by the top and bottom of the contaminant discharge valve j to remove contaminants from the rotating body. This is a contaminant discharge port that discharges outside of λ.

Effect of the Invention) An embodiment will be described in which fuel oil containing moisture, sludge, etc. is purified using a centrifugal separator configured as described above.

When the oil to be treated A is introduced into the rotating body λ rotating several thousand revolutions per minute from the raw solution supply 0B, the oil to be treated AVi is subjected to a strong centrifugal force while flowing through the gap between the laminated separation plates 10. The oil is then separated into clean oil B and impurities such as separated water and sludge. Contaminants accumulate in the contaminant chamber/2, and clean oil B is led out of the rotating body λ from the processing liquid outlet lower. Also, some cleaning oil B
The detection liquid C containing some incompletely separated contaminants flows through the gap flow path between the output plate // and the rotating body, bypasses the adjustment plate, and flows from the detection liquid outlet g to the outside of the rotating body λ. is derived.

The amount derived as the detection liquid C varies depending on the spacing of the above-mentioned gap flow paths, but is about the amount of the liquid to be treated A. The detected liquid C that has been drawn out is circulated to the pipe for the oil to be treated A after it is detected that it has flowed out by the outflow amount detection means 3 provided in the middle of the lead-out pipe. In this state, the detection means 3 outputs a signal to close the contaminant discharge valve 5 to the contaminant discharge valve control circuit &, and the valve j is closed. As the operation continues, foreign matter gradually accumulates in the foreign matter chamber /2, and finally reaches the outer peripheral edge of the lead-out plate //. In this state, the detection liquid gap flow path is blocked by the contaminants DK, and the free surface position d from which the processing liquid is led out.

The outflow of the detection liquid C stops due to foreign matter due to the same position as the free surface position dw from which the detection liquid is drawn out, and the liquid pressure balance acting on the surface, and the outflow amount detection means 3 detects the stoppage of the liquid flow. The contaminant discharge valve is connected to the contaminant discharge valve control circuit.
A valve opening signal is output, and the valve j is opened. discharge valve j
Due to the opening of the valve, the contaminants are discharged from the contaminant discharge port/3 to the outside of the rotating body λ by centrifugal force and led out of the system. The above description is about the case where the outflow of the detection liquid C has stopped, but depending on the properties of the liquid to be treated, the outflow amount may gradually decrease. In that case, the control may be set so that the on-off valve signal is output according to the set outflow amount.

Effects) (1) There is no need for strict selection of adjustment plates or frequent replacement unlike in conventional Beaurif earrings, and separation failures caused by fluctuations in specific gravity can be avoided.

(2) Separation efficiency can be maintained at a high level because separation failure caused by exceeding the tolerance of the contaminant chamber, which occurs in conventional clarifiers, can be avoided.

(3) Since the detection means detects the presence or absence or amount of discharge of the detection liquid, there is no need for an expensive detection means such as conventional detection of water content in clean oil.

(4) Applicable to all solid-liquid separations, liquid-liquid separations, liquid-liquid surface separations, etc. in which there is a difference in specific gravity that can be separated by a centrifugal separator.

(5) The replacement recovery efficiency of clean oil retained in the rotating body with water, etc. can also be increased to nearly the theoretical value.

It is an extremely useful device for industry as it provides the following effects.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an embodiment of the present invention, and FIG. 2 is a schematic enlarged view of the rotary body portion of FIG. 1. /: centrifuge main body, 2 rotors, 3: outflow amount detection means, ri: foreign matter discharge valve control circuit, j: foreign matter discharge valve, 6:
Stock solution supply port, 7: Processing liquid outlet, g: Detection liquid outlet, ri: Adjustment plate, IO=separation plate: //: Derivation plate, /-2 contaminant chamber, 13: Contaminant discharge port, A: Liquid to be treated, B: Treatment liquid,
C: Detection liquid, D: Contaminant. Patent applicant: Mitsubishi Kakoki Co., Ltd.

Claims (1)

[Claims] In a centrifugal separator that separates and processes a liquid to be processed from a rotary body incorporating a plurality of separation plates, the free surface position dO of the processing liquid and the free surface position dw of the detection liquid are substantially the same in the radial direction, In addition, an outflow amount detection means 3 is provided in the detection liquid lead-out conduit.
and a contaminant discharge valve control circuit for opening and closing the contaminant discharge valve according to the output of the detection means 3.