SU787059A1 - Automatic system for medium separation process control - Google Patents

Description

(54) AUTOMATIC REGULATION SYSTEM FOR THE SEPARATION OF THE MEDIUM

one

The invention relates to the treatment of liquids, in particular, to the technique of automatic control of the separation process of two immiscible media, such as oil and water, and can be used mainly in installations for cleaning waste and circulating water from dispersed oil products (lubricating oil, oil, fuel oil) in case of violation of the tightness of the pipe system, their respective heat exchangers: oil coolers, oil coolers, etc.

The systems for automatic regulation of the process of separation of petroleum product-water media in an installation are known, including an oil sump equipped with an electrically driven pump, sensors controlling the upper and lower liquid levels and the control unit 1.

The disadvantage of this system is the low reliability of measuring the level of a liquid medium “oil-product-water” by ohmic sensors installed in an oil sump. With the accumulation in the oil tank oil products, sensor electrodes

coated with oil film. In the process of pumping out oil products from the oil sump, the latter is filled with water which creates an electrical circuit for the flow of current from the sensor to the tank body.

J But due to the sometimes remaining oil film on the electrode, the conduction of the electrical circuit is disrupted and there is no signal to turn on the pump for pumping out oil products. As a result, the normal operation of the automatic control system will be impaired and the efficiency of the media separation process will be underestimated.

The purpose of the invention is to increase the efficiency of the process of separation of media due to

15 improvements in regulation quality.

This goal is achieved in that the system further comprises a media separation sensor installed at the outlet of the oil collection tank, a delay unit, an adder 20, and a comparison unit associated with the upper and lower level sensors and one of the inputs of the adder connected by its other input to the delay unit and the output is via the control unit to the pump electric drive.

The drawing shows a system for automatically controlling the separation process of "petroleum product-water" media.

To the tank 1 are connected in series oil pump. 2, an oil cooler 3 with pipes 4 and 5 for supplying and discharging water, units 6 for lubricating a machine with a pipeline for draining used oil. Directly in the pipeline 5 there is a multi-unit apparatus in the form of a package of equidistant inclined partitions 7. Oil-catching pockets 8 are installed in the upper part of the pipeline for draining oil, and water drains 9 are in the lower part.

The oil tank 10 is connected by oil lines 11 to the pockets 8. On the oil line 12 is installed sensor 13 of the media section. The pump 14 with the electric drive 15 pumps the liquid from the reservoir 1. The upper and lower level sensors 16 and 17, respectively, through the comparison unit 18 and the media separation sensor 13 through the time delay unit 19 are connected by a logic circuit that includes the adder 20, block 21 control and pump 14 with electric drive 15. Breathing tube 22 communicates tank 10 with atmosphere. The system contains an oil cleaning machine 23.

The system of automatic control of the separation process of the product product operates in the following way.

The oil from reservoir 1 is pumped through pump 2 through oil coolers 3 and is supplied to machine lubrication units 6. The oil used in the machine is drained back to the tank. Water is supplied through line 4 to the oil cooler 3, and water is led away through line 5. If the tightness of the pipe system of the oil cooler is impaired, oil begins to flow into the water flow. The flow of the water-oil emulsion moves along inclined channels formed by equidistant partitions 7 of the multi-unit apparatus package. Low flow rates contribute to the fact that oil inclusions are quickly separated from the water in the space of the inclined channels, diverted to the pockets 8 and further along the oil pipe I to 10. The purified oil from the drainage water 9 is diverted into the reservoir. The oil accumulates in the tank 10. As the oil accumulates in the tank 10, its level increases and displaces water from the tank. When the oil reaches the upper level sensor 16, a signal is supplied to the comparison unit 18. With a further increase in the volume of oil in the tank 10, the low level sensor 17 outputs a signal to the comparison unit 18 via the second input. If two signals are equal from the output of the comparator unit 18, the signal arrives at the first input of the adder 20, as a result of which

the input of the control unit 21 receives a signal, and the control unit 21 turns on the electric drive 15 of the pump 14. When the oil product moves along the oil line, the separation sensor 13 does not emit a signal, and the second input of the adder does not receive a signal. This confirms the actual presence of oil moving through the oil pipe. As the oil is pumped out of the tank 10, its level decreases, and the low level sensor 17 is in a water environment. The latter triggers and removes its signal from the comparison unit 18, but the pump continues to operate, since the signal of the lower level sensor is blocked in the comparison unit 18. With a further decrease in the level of oil in the tank, the sensor 16 of the upper level also appears in the water, it works and removes its signal from the comparison unit 18. After the second disappearance of the signal from the input of the comparator unit 18, the latter removes its signal from the adder 20 and the control unit 21, and the pump 14 stops. The further cycle of work is repeated in the same way.

In case of failure of the sensors in the tank 10 after a certain period of time, the program control unit 21 will give a signal to turn on the pump 14. If oil is flowing through the oil pipe 12 when pumping out, the media separation sensor confirms this by the absence of a signal in the control unit 21. As soon as the oil product stops moving along the oil pipe and water goes, the medium separation sensor 13 is activated and issues a signal to the control unit 21 to shut off the pump 14.

In case the program has occurred

the start of the pump, and the oil pipe 12

 water will go immediately, the separation sensor 13

the environment will also shut off the pump with a shutter speed

of time.

Thus, such an automatic control system increases the efficiency of the process of capturing and removing accumulated oil products in the tank 10.

The proposed system of automatic regulation of the separation process of oil-water-to-water mediums prevents the pollution of water bodies with oil products and reduces the cost of funds for the construction of plant-wide stationary treatment plants and their operation.

Claims (1)

Invention Formula The system of automatic control of the separation process of the oil product in an installation that includes an oil sump, equipped with an electrically driven pump, sensors monitoring the upper and lower liquid levels and the control unit, which is