SU1529184A1 - Arrangement for controlling the draining of oil-containing water from oil tankers - Google Patents

Abstract

The invention relates to the management and control of the discharge of oily water from tankers and is associated with the problem of environmental protection. The purpose of the invention is to improve the accuracy of the device. This goal is achieved by introducing an integrator, a subtraction unit, a threshold unit, and a setter for the permissible overflow volume of the water-oil mixture, thereby determining the zone of the final discharge period for the permissible discharged volume and stopping the discharge. 2 Il.

Description

The invention relates to the management and control of the discharge of oil-containing water from tankers and is associated with the problem of environmental protection, more specifically, with the problems of contamination of marine flora and fauna with oil from tankers during the transportation of oil on ships.

The aim of the invention is to improve the accuracy of the device.

FIG. 1 shows a functional diagram of the device; in fig. 2 is a diagram of a control unit for sampling meters and drain valves.

The device contains a sampler 1, a sampling valve 2, a sampling pipeline 3, a sampling pump 4, a sensor 5 for the concentration of the oil / water mixture, a block 6 for monitoring the limiting values of oil content, drain valves 7 and 8, a sensor 9 for the oil – water mixture, a block 10 for multiplying, the divider 11, the first integrator 12, the first 13 and the second 14 threshold blocks, the OR 15 element, the sampling and drain valve control unit 16, the second integrator 17, the subtraction unit 18, the control unit 19 for the allowable overflow volume of the water-oil mixture and the third thresholds th block 20.

The control unit 16 includes a hydraulic distributor 21, hydraulic cylinders 22 and 23, a pneumatic distributor 24 and a pneumatic pilot 25.

The device works as follows.

Vessel water is discharged from a slop tank where ballast and wash water is collected for sludge for a certain time. During sludge oil separation occurs at a height. The main mass of sediment water in height contains an insignificant concentration of oil, then the transition zone is an emulsified mass and then almost pure oil follows. In order to avoid contamination of the marine environment, the discharge of oily water should automatically stop as soon as the controlled parameters of oil and gas

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content exceeds specified limits. When the dumping is automatically stopped before the drain pump is stopped, the residual oil-containing water is sent to the settling tank. Prior to the start of the system, in block 13, the limit value for the total amount of oil discharged, equal to one tristaty oil transported, is set, and at unit 19 - the value of the limited volume of the discharged mixture. The specified value of the maximum volume of the discharged mixture is determined by the level of the interface between the oil and water medium in the settling tank by a level sensor (not shown). The oil-water interface is a strip of emulsified mass. The determination of the boundary layer (emulsified mass) is based on the gaseous effect and consists of registering the occurrence of gingival current when the zinc electrode is transferred from the oil of the oil O neprov () to the first layer to the aqueous conductive layer. The media separation level is determined by a device consisting of a sensing element, which is a zinc disc, which is inserted into a metal cup, a measuring tape, and a millivoltmeter. Measurement of media separation using this sensor is carried out as follows. The lowering of the sensing element in the settling tank, s, 1 unit t following the change of the PCT, mi.1linoltmetra-. With the maximization of the st) Christmas tree of the millivoltmeter, the operator stops the mechanical immersion of the sensing element and starts to honey, flawlessly raise the sensing element up, pub, 1 start. Humor of the movement of stre, 1kI of a voltmeter to, well, a smart ogmegke. At the moment when the arrow of the millivoltmeter starts moving to the zero mark, the readings on the measuring tape, corresponding to the level of the oil-to-water medium section, are taken. Next, the volume corresponding to the level of the interface between the media is counted, and by setting,: on the unit 19 Egch), the value that and in,; 1 is the limit1) ON the valid oGiiCMOM s, 1ive. In the case of a drain piping through the discharge pipeline, the mixture sample is passed through the microprocessor 1, the sampling valve (X) is selected by the sampling valve 2 and the hydraulic sampling conduit 3 is fed by the sampling pump 4 to the input of the sensor 5 and yes, the same IU (.1 d b.yuka 6 controllers with insignificant oil contents in the drainage waters of the lake, the inherent valve 7 is open and the valve I is closed. In block 6 of the counter, 1, besides the oil concentration signal, a signal is received, 1y on the flow rate from the 1 inlet water from the sensor 9 and the signal from the ship's speed meter (not shown). These signals are processed by multiplication unit 10, divider II and integrator 12. At The output of integrator 12 generates a signal about the total amount of oil knocked off, and at the output of divider 1 I, a signal of instantaneous intensity, 1 is not (} 1.) 14 - to a specific level of instantaneous oil discharge. When the established limits are exceeded, threshold blocks 13 and 14 are triggered. The integrator 17 determines the volume of the discharged mixture, which is compared in subtractor 18 With the signal of the limit level set on the setter 19. When one of the three monitored parameters exceeds the set limits, the threshold blocks are triggered and, via the OR 15 element, the command to stop the drain is sent to the input of the control unit 16.

The control unit 16 operates as follows.

If there is a signal at the output of block 6 that permits the discharge of the mixture overboard, the hydraulic distributor 21 supplies the working. Under pressure to the cavity of the hydraulic cylinders 22 and 23, as a result of which the valve 7 opens with the stem of the hydraulic cylinder 22, passing the mixture overboard, and the valve 8 closing the pipeline leading to the standpipe of the hydraulic cylinder 23. At the same time, the pneumatic distributor 24 supplies compressed air to the primary cylinder 25, the stem of which opens the samples (X) and the inlet valve 2, as a result of which the mixture is fed to the input of the concepttrapia sensor.

Claims (1)

Invention Formula A device for controlling the discharge of oil-containing water from tankers, containing a sampler installed at the inlet of the sampling pipeline and discharged on the drain pipeline, installed in series on the sampling pipeline sampling valve and pump, a sensor of the oil-water mixture installed at the outlet of the sampling pipeline, and also connected in series b.yuk control limit values oil1) holding and the control unit of the sampling (..) rn valve.m and drain. to.; Tapan, and The oil content limit control unit includes a series-connected multiplication unit, a first integrator, a first threshold unit and an OR element and a serially connected divider and a second threshold unit connected by an output to the second input of the OR element, the output of which is connected to the output of the oil content limit control unit, The first and second inputs of which are connected to the outputs, respectively, of the concentration sensor of the oil / water mixture and the flow sensor of the oil / water mixture, located in the drain pipe The divider input is connected to the output of the multiplication unit, the inputs of which are connected to the corresponding inputs of the oil content limit control block, characterized in that, in order to improve the accuracy of the device, the second integrator, the subtractor and the third threshold are entered into the counter limit oil value block the unit, as well as the setting unit of the allowable overflow volume of the water-oil mixture, the output of which is connected to the second input of the subtraction unit, the input of the integrator is connected to the second input of the control unit limits the oil content, and the output of the third threshold unit is connected to the third input of the OR element. I L: Phys .1 5o5ort 7 t From pumped out pump Over 5opin In a slop tank From 15 To npoSoomfopnof y pump Fig 2