JPS5947603B2 - Rolling oil recovery device in rolling oil fume during metal rolling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for treating rolling oil fume during metal rolling.

In the cold rolling of metal plates, such as steel plates, emulsion compositions such as palm oil, beef tallow, mineral oil, or resin resin are used to reduce friction between the rolling rolls and the rolled material or to prevent the rolling rolls from rising in temperature. Used as rolling oil.

There are two methods of supplying rolling oil to the rolling points: a circulating oil supply method and a non-circulating oil supply method, but recently the circulating oil supply method has been adopted in order to save rolling oil and prevent environmental pollution such as drainage. has been done.

The device for recovering rolling oil from a rolling oil fume according to the present invention can be particularly effectively applied to a circulating oil supply system.

However, the application of the present invention is not limited to the above-mentioned circulating oil supply system, but can be applied to all cases of recovery and reuse.

In metal rolling, for example cold tandem rolling of steel plates,
As the temperature rise becomes severe enough to eventually cause seizure, rolling oil is supplied to cool the rolling rolls and the rolling plate, and to lubricate the rolling rolls and the rolling plate. The temperature is maintained at 50-250°C.

For this reason, approximately 30 or more of the rolling oil supplied to the rolling roll surface becomes fume and evaporates around the rolling mill, polluting the environment and contributing to increased consumption of the rolling oil.

For this purpose, the evaporated fume is collected through a hood installed above the rolling mill, solidified and deposited in a deposition tank, and periodically excavated and removed.

These excavated and removed sediments are subject to deterioration due to, for example, oxidation due to the prolonged deposition time, causing many problems in terms of recycling, and are generally disposed of by incineration.

Furthermore, excavating the sediments in these sedimentation tanks was fraught with many difficulties due to the harsh working conditions in the harsh environment.

The present invention condenses the rolling oil fume generated during rolling, continuously collects it in a fluid state, and recovers the rolling oil in the rolling oil fume during metal rolling, which can be recovered without causing any change in oil or fat. DESCRIPTION OF THE PREFERRED EMBODIMENTS An example in which the present invention is implemented in a rolling oil recovery device for rolling oil fumes during cold rolling of steel plates will be described in detail below with reference to the drawings.

However, the present invention is not limited to this example,
The present invention can also be applied to other metal rolling or hot rolling without departing from the purpose of the present invention.

In the figure, reference numeral 1 denotes a cold rolling mill for steel plates, which is used for tandem rolling or reverse rolling.

1' is a rolling roll, and a rolling oil supply nozzle 2 is provided facing the rolling roll 1'.

Reference numeral 3 denotes an oil collection disk provided on the lower surface of the roll in the rolling mill, and is connected to an oil storage tank 4 through a pipe 3'.

Reference numeral 5 denotes a hood provided above the rolling mill 1 to cover the rolling mill, and is connected to a fume guide pipe 6.

The hood 5 is formed in a shape that can easily collect rolling oil fumes generated during rolling, for example, a canopy shape such as an umbrella shape, and can be attached to the rolling mill housing or a suitable support frame provided separately.

Reference numeral 7 denotes a condensing tank, which is connected to the other end of the humid guide pipe 6 whose one end is connected to the hood 5 described above.

The bottom surface of the condensation tank 7 is formed with inclined surfaces 8, 8' inclined toward one side or the middle thereof, and a condensate collecting groove 9 is provided on the lower inclined side.

Reference numeral 10 denotes an inflow delivery device provided within the collecting groove 9.

The inflow delivery device 10 can be arbitrarily selected, for example, a mechanical conveying device such as a screw conveyor, a hydraulic conveying device using pressure fluid, etc. without departing from the object of the present invention.

The present invention is also applicable to cases where the collecting groove 9 is sloped and the collected material can flow down by itself, for example, when the bottom surface of the condensing tank 7 is formed in the shape of a funnel and the collecting groove is provided at a steep slope from the end of the funnel, the collecting groove is There is no need to force a delivery device to be provided.

Such self-blade flow-feeding structure itself is defined as within the scope of the collecting groove with a feeding device in the present invention.

11 is a storage pit connected to one end of the collecting groove 9.

The collecting groove 9 and the storage pit 11 described above may be provided with a temperature maintaining device necessary to maintain the fluidity of the condensed oil, if necessary.

Reference numeral 12 denotes a pipe for extracting the stored condensed oil and is connected to an oil and fat separation device 14 via an appropriate pumping means 13 such as a pump.

As the separation device 14, an appropriate separation device such as a centrifugal separator for separating oil and fat can be selected.

15.15' is a barrier provided on the discharge side of the condensation tank 7, 1
6 is a suction blower for the rolling oil fume; 117 is an exhaust diffusion tower.

The apparatus for recovering rolling oil in a rolling oil fume according to the present invention is as described above, and its operation will be further described below.

For example, rolling oil fume evaporated during cold rolling of a steel plate is collected from a hood 5 by a suction blower 16 and introduced into a fume condensation tank 7 through a fume guide pipe 6.

These rolling fumes differ depending on the rolling oil used, but for example, they contain 5% oil and fat, 94% water, and the rest are impurities, and this fume has a bad odor. For example, beef tallow oil or palm oil is 250C.
to solidify.

The rolling oil fume introduced into the condensing tank 7 is cooled, condensed and liquefied, drops onto the tank bottoms 8 and 8', flows down along the slope, and is collected in the collecting groove 9.

It is preferable to adjust the temperature of the condensate in the condensation tank 7 so as not to solidify it, and in particular, the condensate should have fluidity necessary to flow down the inclined surface of the bottom of the tank.

Further, the inside of the condensing tank T can be maintained at the liquefaction temperature of the fume by an appropriate cooling means, if necessary.

The condensate that has flowed down into the collecting groove 9 is discharged and stored in a storage pit 11 by automatic blade flow or by a suitable delivery device 10.

On the other hand, non-condensable gas is drawn out from the condensing tank 7 by the suction blower 16 and discharged from the stripping tower.

The condensate in the storage pit 11 is pumped up by a pump 13 and charged into a centrifugal separator 14, where fats and oils are separated and recovered.

The separated and recovered fats and oils are free from deterioration over time such as oxidation and are returned to the oil storage tank 4 to be used again as rolling oil.

In some cases, the separated and recovered fats and oils are used as raw materials for soaps, etc., as well as recycled rolling oil.

The rolling oil recovery device in the rolling oil fume of the present invention has an extremely simple structure as described above, and can be installed in a small space in a rolling mill, and it does not cause the oil and fat content from the rolling oil fume to change and deteriorate as needed. It is an extremely effective device for making thorough use of resources and preventing environmental pollution in rolling mills.

[Brief explanation of drawings]

FIG. 1 is a route layout diagram of the apparatus of the present invention, and FIG. 2 is a cross-sectional view of the condensing tank. 1...Rolling mill, 5...Air collection hood, 8
, 8'... Slope, 9... Gathering groove, 7.
... Condensation tank, 11 ... Storage pit, 14
...Separation device.

Claims (1)

[Claims] 1 The bottom surface connected by a conduit to the air collection hood that covers the upper surface of the rolling mill is formed with an inclined surface, and a collection groove is connected to the sloped end and collects and discharges condensed rolling oil fume from the air collection hood. a condensation tank having a condensation tank, the condensed waste storage pit connected to the collecting groove, and a separation device connected to the storage pit by a conduit and separating oil and fat components mixed in the stored material from the storage pit. A rolling oil recovery device for rolling oil fume during metal rolling.