US1922714A - Apparatus for the removal and recovery of oils and grease from oil laden water and the like - Google Patents

Description

E. RIDLEY :n l ll In 1/ e n for: Alfred Edward Ridley. WW8 fltty s.

Aug. 15, 1933.

APPARATUS FOR THE REMOVAL AND RECOVERY OF OILS AND GREASE FROM OIL LADEN WATER AND THE LIKE Filed March 11,

Patented Aug. 15, 1933 UNITED STATES PATENT OFFICE Ailired Edward Ridley, Llanelly, England Application March 11,

and in Great Br L Claim.

This invention relates to apparatus for the removal and recovery of oils and grease from oilladen water and the like and more especially from bilge and ballast water of steam and oil driven ships, condenser water and so forth.

According to the invention the apparatus generally consists of a main receiving tank or vat, the dirty oil and the grease laden water from the bilges, double bottoms and so on or from condensers being delivered into a first section or" such tank or vat by means of a pipe onto a cone which spreads the iiow of water onto an antisplash tray from which it can fall easily into said first section 01 the tank, which can be lined with a removable container. The oil and grease floating on the surface thereof pass through a perforated and slotted division wall orpartition disposed in the tank, into a second section said water having been steadied in the first section.

The oil and grease laden water then passes through a series or" guide plates arranged in the second section of the tank which further deflects and steadies the flow of water in its travel or path to a third section into which section or chamber the oil passes over another division plate. The level of the water is controlled by a float and by a valve arranged in or on the, main discharge pipe, any water which may pass over the top edge of the second division plate being returned to the second section of the tank through a connection or pipe communicating between the two, or drained away to a suitable receiver.

The oil or grease which is recovered in the third section or chamber is carried away to a filter or to oil storage bunkers for re-use or tanks disposed at a suitable level, through an outlet pipe from said third section.

The main discharge pipe is carried upwards into the main air snore cover pipe which is provided with a snore piece so that in the event of the water falling below the level of the top' of the main discharge pipe no oil or grease can pass away there-through as it automatically snores in clean air. The lower part of the snore piece comes down over the upper inlet part of the main discharge pipe.

The level of the water may, as previously stated also be controlled by the float and valve to give a double assurance that all oil and grease is recovered and removed from the oil laden water and that only cleansed water is discharged from the discharge pipe into the sea, river, storage reservoir or wherever else required.

The oil and grease so recovered can be purified for service again in the usual manner, or

1931, Serial No. 521,835, itain July 16, 1930 used for power generation in crude oil engines and the like.

Provision is also made for the application of heat or steam in very cold weather for liqueiying heavy oil or thick grease laden water, when this might be necessary.

The control valve and float may in some cases be dispensed with or fitted inside the snore cover pipe.

The hot dirty water for instance from condensers can thus be treated and used for boiler feeding with resultant economy and the hot condenser overflow water can be fed directly to the economizer instead of cold water.

For marine work the hot dirty water from the condenser can be thus treated and all or part of it used for feeding evaporators. The temperature of the condenser discharge would materially aid evaporization, thus increasing the efficiency of the evaporator.

In order that the invention may be fully understood reference will be had to the accompanying drawing in which: Figure 1 is a sectional longitudinal elevation of an apparatus constructed according to the invention.

Fig. 2 is a corresponding plan; Fig. 3 is an end View Fig. 4 is a longitudinal section of a simplified apparatus. Fig. 5 is a plan view of Fig. 4 connected up with an oil receiving tank for use in connection with garages, works and so on. Figs. 6 to 9 show forms in which the apparatus may be constructed.

According to Figs. 1 to 3, the apparatus which is particularly suitable for the prevention of coastal pollution by oil, the recovery of the oil for re-use and for the de-oiling of hot condenser discharge and the return of clean hot water to evaporator and/or economizers and boilers, consists of a main tank A, a first section A receiving the polluted water from a pipe B on to a cone C spreading the same on to an anti-splash tray D from which it falls into said first section A The oil and grease fioat on the surface thereof and pass through a perforated division E into the section A then through a series of guide plates F to deflect and steady the flow of water to a third section A to which the oil passes over or through another perforated division plate G the level of water being controlled by a float H and a valve I arran ed in or on the main discharge pipe J. Any water flowing over the top edge of the plate G is returned to section A through a communicating pipe K.

It will be observed that the bottom of the section A is disposed at or above the level of the water in the section A and as the level of said water is controlled by the float H said water is prevented from rising through the pipe K into the section A The oil or grease recovered in A is taken to a filter through a pipe L, or to suitable tanks for re-use.

The main discharge pipe J passes upward into the main air snore pipe M provided with a snore piece M Bafiles or deflectors A may also be provided to steady the flow of water.

For use in land work these baffles A as also the plates F may advantageously be omitted.

In the construction shown in Figs. 4 and 5 which is a simple form for use in connection with garages or works, a removable container N for solids is provided beneath the grid or drain N and the valve M would be disposed inside at the top of the entrance to the discharge pipe J. It is shown connected to an oil receiving vessel P.

Figures 6 to 9 show skeleton diagrams of various forms in which the apparatus may be constructed according to the particular purpose for which it is destined, the exact shape and disposition of the chambers and parts described being modified to suit actual requirements.

I claim:'

Apparatus for the removal and recovery of oils and grease from oil-laden water comprising a main tank, a partition dividing said main tank into two sections, an inlet pipe for conveying polluted water into one section, a cone beneath the inlet for receiving the polluted water, a tray beneath said cone, said cone and tray preventing the splashing of the entering polluted water, perforations in said partition, the surface water in the receiving section flowing through said perforations into the next section of the main tank, a discharge pipe for clean water, an air snore pipe to said discharge pipe, a valve in said discharge pipe, a float controlling said valve, an oil tank, a wall dividing said oil tank from said main tank, said wall having perforations, the oil lying on the water in said main. tank passing through said perforations into said oil tank, an oil discharge pipe connected with said oil tank, and a pipe communicating with the main and oil tanks for the return of extraneous water in the oil tank to the main tank.

ALFRED EDWARD RIDLEY.

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