JPH0398601A - Oil recovery device - Google Patents

Abstract

PURPOSE:To recover oil from waste liquid continuously and thereby make a device compact and operative with reduced energy consumption by providing an oil and water separation chamber, a water evaporation chamber and a vapor and liquid separation chamber in the main body of a vessel. CONSTITUTION:An oil and water separation chamber 9 in which a waste liquid feed pipe 6 and the first heating device 8 are arranged is provided in the main body 1 of a vessel. In addition, a sludge separation chamber 12 with a sludge separation plate 11 which separates sludge from an oily component separated from the chamber 9 by specific gravity difference and a water settlement chamber 13 which conducts a water component accumulated in the chamber 9 and settles and separates sludge are arranged in the main body 1 of the vessel. Furthermore, a water evaporation chamber 20 in which the second heating device 19 is provided and the liquid passing through the chambers 13, 12 is conducted and the moisture is evaporated, is provided. Then a vapor and liquid separation chamber 44 and a sludge accumulation chamber 47 are provided. In addition, an oil extraction pipe 33 for extracting the oily component remaining in the chamber 20 and a sludge extraction tube 49 for extracting sludge accumulated in the chamber 47 are provided. As a result, continuous oil recovery is possible.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an oil recovery device that separates moisture and sludge from waste liquid, such as waste oil, and recovers oil.

Conventional technology Normally, in a ship, unnecessary oil and oil are removed from the main engine, auxiliary engine, etc.
Waste oil containing water, sludge, etc. is already generated, but this waste oil cannot be dumped into the sea and must be treated at a facility on land or onboard a ship. However, processing at a facility on land increases processing costs, so it is preferable to process onboard a ship. Conventionally, when processing onboard ships, some ships have removed moisture and sludge from waste oil, taking into account economic considerations, miniaturization of existing processing equipment, and the fact that waste oil contains a large amount of usable oil. Equipped with oil recovery equipment for separation. By the way, as this type of oil recovery apparatus, there are, for example, a specific gravity separation type and an evaporation type.

The former oil recovery device, as shown in FIG. 3, transfers waste oil from a waste oil tank 61 into a separation tank 62, and heats the waste oil with a heating pipe 63 disposed inside this separation tank 62, while heating the waste oil. After standing for a long time until the oil layer, water layer and sludge layer are formed due to the difference in specific gravity between the water and sludge, water is removed from the water outlet pipe 64 on the side of the tank, and sludge is removed from the sludge outlet pipe 65 at the bottom of the tank. After taking out the oil, the oil was also taken out from the oil take-out pipe 66 at the bottom of the tank. In addition, as shown in FIG. 4, the latter oil recovery device transfers waste oil from a waste oil tank 7l into an evaporation tank 72, and heats the waste oil with a heating pipe 73 disposed within this evaporation tank 72. After the water was evaporated, the residual oil was taken out from the bottom take-out pipe 74, and the residual oil was sent to a centrifugal sludge separator (not shown) to separate the sludge.

Problems to be Solved by the Invention According to the above conventional structure, there were the following problems. (1) In the case of the former ■ Since it is a batch type, the time for separation and removal of oil becomes long and the capacity of the separation tank becomes large.

■Since the moisture content is unknown and the moisture is taken out from the water outlet pipe on the side, removal of moisture is uncertain, and if it becomes an emulsion, separation of moisture becomes impossible.

■Difficult to distinguish between sludge and oil, making sludge separation uncertain.

(2) In the latter case ■ Since it is a batch method, the time for evaporation becomes longer and the capacity of the separation tank becomes larger. ■A sludge separator is required to separate sludge from residual oil, making the equipment expensive. Therefore, an object of the present invention is to provide an oil recovery device that can solve the above problems.

Means for Solving the Problems In order to solve the above problems, the oil recovery device of the present invention is an oil recovery device that recovers oil by separating and removing water and sludge from a mixed waste liquid in which oil is mixed with water, sludge, etc. A waste liquid supply pipe for supplying waste liquid is connected to the lower part of the container main body, and an oil-water separation chamber in which a first heater for heating the waste liquid is disposed is provided in the lower part of the container main body. A sludge separation chamber is provided at the top of the container body, in which a sludge separation plate is arranged to separate sludge from the oil separated by the difference in specific gravity in the oil-water separation chamber. A water settling chamber is provided for guiding moisture to sediment and separate the sludge, and a second heater is disposed on the other side of the container body, and for guiding the liquid that has passed through the water settling chamber and the sludge separation chamber. A water evaporation chamber is installed to evaporate water. A gas-liquid separation chamber is provided in the container body above the water evaporation chamber, a sludge storage chamber is provided at the bottom of the container body, and an oil extraction pipe and sludge storage are provided for taking out the oil remaining in the water evaporation chamber to the outside. A sludge removal pipe is provided to take out the sludge accumulated in the chamber.

Operation According to the above structure, the waste liquid supplied from the waste liquid supply pipe to the oil wood separation chamber in the container body is heated to a predetermined temperature by the first heater and separated into three layers of sludge, water and oil. The oil in the uppermost layer then flows into the water evaporation chamber, where it is further heated by the second heater and the water contained in the oil is evaporated and separated. The oil remaining in the water evaporation chamber is collected at a designated location, such as an oil recovery tank, via an oil extraction pipe, and then used in a boiler or the like. On the other hand, the sludge that has settled in the sludge storage chamber is discharged from a sludge take-out pipe to a predetermined location, such as a sludge tank. Further, when the water level in the oil-wood separation chamber rises, water flows into the water evaporation chamber through the water settling chamber and is evaporated, thereby controlling the water level in the oil-water separation chamber.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 and 2.

In Figure 1, 1 is a waste oil tank 2 that stores waste fuel oil (oil containing water, sludge, etc.) generated on board a ship, for example.
This is the container body of an oil recovery device that separates moisture and sludge from waste oil.

That is, in the lower part of the container body l, one end is connected to the waste oil tank 2, and a waste oil pump 3, a first
The other end of a waste oil supply pipe (waste liquid supply pipe) 6 is connected to which a control valve 4 and a waste oil on/off valve 5 are interposed. An oil-wood separation chamber 9 is provided in which a connected first heater (also referred to as a pre-heater) 8 for heating waste oil is arranged. A sludge separation chamber 12 is provided in which a sludge separation plate l1 is disposed to separate sludge from oil, and a water settling chamber l3 is provided on one side of the container body 1 to settle sludge in water. Note that 14 and 15 are side plates for forming the sludge separation chamber 12 and the water settling chamber l3.In addition, the other side of the container body 1 opposite to the water settling chamber 13 side The section is connected to the second steam supply pipe 16 and has a sludge separation chamber l2.
or from the water settling chamber 13 to the first and second transfer pipes 17. a second heater (also called a vaporizer) that heats the liquid, that is, oil and moisture transferred through the tube 18;
A water evaporation chamber 20 in which 19 is arranged is provided. Note that 2l is a partition plate for forming the water evaporation chamber 20;
2 is a second control valve provided in the middle of the first transfer pipe 17.

In addition, first and second steam on-off valves 23. 24 is interposed.

An oil extraction pipe 33 is connected to the water evaporation chamber 20, which leads the oil to an oil recovery tank 31 and has a third control valve 32 interposed therebetween. A liquid level gauge 34 for detecting liquid temperature and a temperature detector 35 for detecting liquid temperature are provided. In addition, the oil-wood separation chamber 9 is provided with a water detector 3G for detecting the water level therein, and signals from the water detector 36 and the temperature sensor 35 are inputted to the oil-water separation chamber 9 and the water level. At least the first to third control valves 4, 22. A control device 37 for controlling 32 is provided. Further, above the water evaporation chamber 20 in the container body 1, a gas-liquid separation plate 41 and an atmosphere discharge pipe 42 are connected at a position above the gas-liquid separation plate 41 and a gas-liquid separation NWI 4.
A gas-liquid separation chamber 44 in which a steam blow valve 45 is disposed is provided at the bottom of the container body 1, and a sludge storage chamber 47 is provided at the bottom of the container body 1 in which a steam blow pipe 46 with a steam blow valve 45 interposed therein is inserted. It is being Note that a sludge take-out pipe 49 for guiding sludge to a sludge tank 48 is connected to the bottom of the sludge storage chamber 47 .

Further, although not shown, a waste oil return pipe is connected midway through the waste oil supply pipe 6 at a position upstream of the first control valve 4.

Next, we will explain the effect. Normally, when the operation is stopped, the container body 1 is filled with waste oil and the temperature is raised to 80°C by the first heater 8.
It is maintained at ℃. In addition, if the water evaporation chamber 20 is empty at the beginning of operation, the C heavy oil will rise up to the normal liquid level in the hopper 50.
It is staked out from At the start of operation, the waste oil on-off valve 5 and the second steam on-off valve 24 are opened, and the waste oil pump 3 is operated. Next, when the oil temperature in the water evaporation chamber 20 reaches 115 to 120°C or higher, the first control valve 4 is opened by the control device 37 via the temperature detector 35, and the waste oil is metered into the oilwood separation chamber 9. Supplied. Note that the oil temperature in the water evaporation chamber 20 is limited to approximately 120°C by an automatic temperature control valve at the steam inlet. 6 The waste oil supplied to the oil-water separation chamber 9 is heated to approximately 80°C while removing oil and moisture. and sludge. The oil separated into the uppermost layer passes through the sludge separation plate 1l, and after the sludge is separated and removed, it flows into the water evaporation chamber 20 through the first transfer pipe. Note that the separated sludge settles in the sludge reservoir chamber 47. The oil content that has flowed into the water evaporation chamber 20 is 115 to 120°C.
The water mixed with the oil is evaporated and separated, and released from the atmosphere discharge pipe 42. The oil from which water has been removed is led to the oil recovery tank 3I via the oil extraction pipe 33. Note that when the oil temperature in the water evaporation chamber 20 falls below the water evaporation temperature, the first and third control valves 4 and 32 are closed by the control device 37 via the temperature detector 35, and the oil temperature becomes 115 again. The supply of waste oil and the removal of oil are temporarily stopped until the temperature reaches ~120°C, that is, until the water has evaporated. On the other hand, the water separated in the oil-water separation chamber 9 accumulates in the upper part of the sludge storage chamber 47, and the water level rises, causing the water detector 3
6 is activated, the second control valve 22 is closed by the control device 37, the accumulated water enters the water settling chamber 13, and the sludge is settled and separated. Water flows into the water evaporation chamber 20 from the second transfer pipe 18, is evaporated, and is discharged into the atmosphere. Note that during this time, the third control valve 32 is closed and the discharge of oil is stopped. This control maintains the water level in the oil wood separation chamber 9 within a certain range. The sludge separated in the oilwood separation chamber 9, the sludge separation chamber 12, and the water settling chamber 13 is discharged into the sludge tank 48 through the sludge take-out pipe 49, and is incinerated after landing. If the sludge is stuck in the sludge storage chamber 47 and cannot be discharged, steam is supplied from the steam blow pipe 46 to heat and soften the sludge, and then the sludge is discharged.

In this way, oil from which moisture and sludge have been removed can be continuously recovered.

When the apparatus is to be stopped, the second steam on-off valve 24 of the second heater 19 is closed, and the waste oil pump 3 is also stopped. Note that steam is constantly supplied to the first heater 8 so that the waste oil in the device does not cool and solidify, and the temperature inside the device is maintained at about 80°C. Incidentally, a schematic flow of the above operation is shown in FIG. 2.

Effects of the Invention As described above, according to the configuration of the present invention, inside the container body,
Since an oil wood separation chamber, a sludge separation chamber, a water evaporation chamber, and a gas-liquid separation chamber are provided, oil can be continuously recovered from waste liquid, which results in the miniaturization of the recovery tank and, in turn, the miniaturization of the entire device. In addition, it saves labor as there is almost no need to operate valves like in batch processing, and it also eliminates the need for a centrifugal sludge separator like in the past, reducing costs.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention,
FIG. t is a schematic overall sectional view, FIG. 2 is a flow chart showing a schematic process, and FIGS. 3 and 4 are sectional views showing a schematic structure of a conventional example. 4... First control valve, 6... Waste oil supply pipe, 8... First heater, 9... Oil/water separation chamber, II... Sludge separation plate, l2... Sludge separation chamber, 13... Water settling chamber, 17... First transfer pipe, 18... Second transfer pipe, 20... Water evaporation chamber, 22... Second control valve, 32
...Third control valve, 33...Oil extraction pipe, 34...
Liquid level indicator. 35...Temperature detector, 36...Water detector,
37... Control device, 43... Gas-liquid separator, 44...
・Gas-liquid separation chamber, 47...Sludge storage chamber, 49...
Sludge removal pipe.

Claims (1)

[Claims] 1. An oil recovery device that separates and removes water and sludge from a mixed waste liquid containing oil, water, sludge, etc., and recovers oil, and a waste liquid supply pipe that supplies waste liquid is connected to the lower part of the container body. An oil-water separation chamber in which a first heater for heating the waste liquid is arranged is provided in the lower part of the container body, and a sludge is separated from the oil separated by the difference in specific gravity in the oil-water separation chamber in the upper part of the container body. A sludge separation chamber is provided in which a sludge separation plate is arranged to separate the sludge, and a water settling chamber is provided on one side of the container body to guide moisture accumulated in the oil-water separation chamber to settle and separate the sludge. A second heater is disposed on the other side, and a water evaporation chamber is provided for guiding the liquid that has passed through the water settling chamber and the sludge separation chamber to evaporate moisture, and the container body is located above the water evaporation chamber. A gas-liquid separation chamber is provided inside the container body, a sludge collection chamber is provided at the bottom of the container body, an oil extraction pipe is provided to take out the oil remaining in the water evaporation chamber to the outside, and a sludge extraction pipe is provided to take out the sludge accumulated in the sludge collection chamber. An oil recovery device characterized by being equipped with a pipe.