JPS6230515A - Apparatus for treating contaminated liquid - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention comprises liquid supply and discharge connections and is provided with a guide surface for guiding a liquid containing deposit-forming contaminants of solid particles, through which said liquid flows. The present invention relates to an apparatus for treating contaminated liquid, comprising at least one treatment chamber.

(Prior art and its problems) The above-described device can be used, for example, as a stationary or centrifugal separator for fuel or lubricating oil, or as a heat exchanger.

Oil used as fuel in large diesel engines must be purified of water and contaminants before being supplied to the motor. Usually this is done using a centrifuge. Such a centrifugal separator comprises a group of coaxially arranged conical cover-shaped valve separation plates which, in operation, are rotated about a common solid axis. Contaminated oil supplied in the vicinity of the solid shaft flows through a group of separator plates.

The centrifugal force acting on the contaminants in the oil ensures that these contaminants are separated from the oil and collected in the large diameter section of the processing chamber. The purified oil is again discharged from the small diameter section of the processing chamber.

If the separator is of the so-called self-draining type, the collected contaminants are discharged from the separator during operation. The above contaminants can be removed after disassembly of the separator.

In centrifugal molecular analyzers and other devices such as those described above, a problem arises in that solid particles present in the liquid form deposits on the guide surfaces in the processing chamber of the device. This necessitates periodic disassembly and cleaning of the device; failure to do so may result in blockage of the device due to accumulated contaminants. Not only does this require periodic cleaning, which increases costs, but the equipment also deteriorates in operation as contamination increases. In order not to shorten the cleaning interval too much, the device must have a very large capacity.

(Means for Solving the Problems) An object of the present invention is to provide a device of the type described at the beginning of the Detailed Description of the Invention column of this specification, which has a low operating cost. do.

According to the invention, the above object is achieved by forming at least the surface part of the guide surface which is most exposed to the deposits of contaminants from a plastic having the properties of polytetrafluoroethylene. It has been found that as a result of this, the surfaces are no longer free of any deposits of contaminants, thus increasing the time interval between two periodic cleanings considerably.

It has been known for a long time to use polytetrafluoroethylene (tetrafluoroethylene resin: hereinafter abbreviated as PTPE) as a non-adhesive layer in pans and the like. PTFE prevents food adhesion due to partial carbonization, especially when heated excessively. In accordance with the present invention, it has been found that PTFE may also prevent deposit formation.

There is no doubt that in this case no adhesion occurs due to local carbonization as a result of overheating.

(Example) The present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, a centrifugal separator I comprises a housing 2,
The housing surrounds the separation chamber 3.

A casing (not shown) is arranged around the housing 2 . The housing 2 is rotationally driven by a shaft 5. As a result of this rotation, a centrifugal force field is created in the separation chamber 3 in which, for example, oil contaminated with solid particles and sometimes water can be purified.

The contaminated oil is fed into the supply line 4 via suitable connections in the casing. This supply line 4
An artificial flow path 6 is provided at the lower end of the inlet flow path, and the inlet flow path communicates with the separation wheel 3.

A large number of separation disks 8 are provided coaxially within this separation chamber 3. A flow path 9 is formed between these disks 8 . Due to the centrifugal force field formed by rotation, (1(16λ1.f-
Oil's visit t1 left n-sai agency main office X k! The l l'i part is subjected to an outward force, while the lighter component is subjected to an inward force. As a result, contaminants 13 consisting of solid particles collect at the largest diameter of the chamber 3, water, sometimes present, also collects at the outermost periphery of the chamber 3, and the lighter oil collects at the smallest diameter.

The icy element fraction in the oil flows upwardly through a channel 15 starting in a relatively large diameter section of the chamber 3 and is discharged along a channel edge 16 to the water outlet 12 . The water outlet is connected to an outlet formed in the casing in a known manner.

By selecting the radius of the passage edge 16, it is possible to adjust the level of separation of water and oil in the separation chamber 3, indicated schematically by number 7.

The oil present in the flow path 9 is still affected by the centrifugal field and any contaminants still present here are separated from the oil. The purified oil is discharged to an oil outlet 11 via a discharge passage 10.

The illustrated centrifugal separator 51 is of a so-called automatic discharge type.

This can be accomplished by moving the lower part of the housing a short distance relative to the upper part of the housing by a suitable method to create a contaminant drainage channel between the two housing parts, thereby transferring the collected contaminants 13 to the contaminant outlet 14. This means that the scales will be automatically drained through.

Embodiments are also known in which the housing is not divided and the collected contaminants are periodically removed during disassembly.

According to the invention, the surface portion through which the liquid containing solid particles is guided is formed of polytetrafluoroethylene (PTFE) or a material having properties equivalent to it. In FIG. 1, the areas to which this plastic is applied are indicated by dots. As shown in the figure, the inner wall of chamber 3 has 18 layers of PTFE.
Covered. Plate 8 is made entirely of PTFE. Note that the plate 8 is made of stainless steel, and these plates are made of PT.
It may be coated with FE.

According to one deaf aspect of the invention, only the surface portion of the separating plate on which the force of the force field is directed can be provided with PTFE. In the centrifugal separator 1 of FIG. 1, the separation force is radially outward, which suggests that the lower side of the plate can be made of PTFE or coated with PTFE. Since these surfaces are usually the most exposed to contaminants, the greatest benefit is obtained precisely by making these surfaces from PTFE.

As shown in FIG. 2, the present invention can also be suitably applied to a fixed separator 25. This separator 25 is primarily intended to remove solid particles and oil from water.

Such separators are used, for example, on ships to purify waste water.

The separator 25 includes a housing 26 in which a separation chamber 27 is formed. The waste water is supplied via a waste water supply 28 and reaches a pre-separation area 29 .

The flow rate in all separators is set low so that separation of the contaminated parts can occur under the influence of gravity.

A portion of the oil has already collected at the top of the pre-separation area 29 and this oil can be discharged via the oil outlet 34. Some of the solid particulate contaminants settle within the pre-separation zone and come to rest on the bottom of chamber 27.

The pre-purified water then flows upwardly through some separation plates 30 at a low flow rate. Within the channels formed between these plates 30, extremely small droplets of oil coalesce to form larger droplets. This oil collects at the top of chamber 27 and can be drained via oil outlet 32. The water thus purified from oil and solids is discharged through outlet 31. The solid particles collected at the bottom of the chamber 27 are periodically discharged via the solids outlet 33.

According to the invention, the surface area exposed to the deposit of contaminants is made of PTFE or a material with similar properties. The walls of the pre-separation area 29 and the bottom of the processing chamber 27 are provided with PTPEB 35. Considering that the solid particles are in the best contact with these walls, the tendency for deposits to form is greatest on these walls. Also, the separation plate 30 may be made of PTFE or l'
It can be coated with TFH.

Is the invention separate? It is particularly suitable for use as a deaf device. However, considering that these are intended for general treatment of liquids containing contaminants consisting of solid particles forming deposits, the present invention is applicable to heat exchangers such as fuel oil preheaters or lubricating oil coolers, etc. can also be applied with favorable results. In such heat exchangers, depending on the flow conditions, there can be a tendency for solid particle deposits to form.

The formation of these deposits is effectively prevented by application of the present invention.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a centrifugal separator according to the present invention, and FIG. 2 is a vertical cross-sectional view of a fixed separator according to the present invention. 3.27... Chamber, 8.30... Separation plate, 13... Contaminants. Patent applicant Euro Technical Oil Services B.V.

Claims (4)

[Claims] (1) A contaminated liquid treatment device comprising at least one treatment chamber having liquid supply and discharge connections and provided with a guide surface for guiding a liquid containing solid particle deposit-forming contaminants, through which the liquid flows, A contaminated liquid treatment device characterized in that a surface portion of the guide surface that is most exposed to deposits of the contaminant is formed of a plastic having properties of polytetrafluoroethylene. (2) A patent in which the processing device is a separator having a number of separating plates arranged at a certain angle to the force field at least during operation, and the surface to which the force in the force field is directed is formed of the plastic. Apparatus according to claim 1. (3) The device according to claim 1 or 2, wherein the plastic is applied as a surface coating. (4) The device according to claim 2, wherein the entire separating plate is made of the plastic.