KR101434430B1 - System For Condensing Volatile Organic Compound - Google Patents

Abstract

A volatile organic compound condensation system is disclosed.
The volatile organic compound condensing system according to an embodiment of the present invention includes a crude oil transfer line drawn from the lower portion of the crude oil reservoir and connected to the lower portion of the crude oil reservoir again, a pumping portion provided in the crude oil transfer line, An evaporator, a volatile organic compound transfer line drawn from the upper portion of the crude oil reservoir and connected to the eductor, and a mixer for condensing volatile organic compounds connected to the downstream end of the oil transfer line.

Description

System For Condensing Volatile Organic Compound "

The present invention relates to a volatile organic compound condensing system, and more particularly, to a volatile organic compound condensing system in which a volatile organic compound generated in a crude oil carrier or a storage tank of a liquid cargo is liquefied without releasing it to the atmosphere, .

Generally, crude oil is mined from the production site, loaded on a crude oil carrier, and then transported to the destination by voyage.

In the conventional crude oil carrier, a large amount of volatile organic compounds (VOC) was generated in the process of loading crude oil from a crude oil storage tank of a crude oil carrier to a crude oil storage tank of a crude oil carrier from land or sea.

In addition, when the crude oil carrier is navigated by sea, a considerable amount of volatile organic compounds have been generated due to fluctuation of crude oil storage tank of the crude oil carrier by waves, winds or the like depending on the sea condition.

When such a volatile organic compound is generated, the pressure inside the crude oil storage tank is increased and thus the safety of the crude oil storage tank becomes a problem. Hitherto, such a volatile organic compound has been released to the atmosphere.

The release of volatile organic compounds has caused serious environmental problems such as pollution of the atmosphere. IMO will prepare regulations on greenhouse gas reduction for offshore structures such as ships in response to global GHG reduction efforts, Development of eco-friendly technologies such as crude oil carrier is required.

 In addition, since volatile organic compounds are the main components of crude oil, there is a problem of loss of crude oil transported as volatile organic compounds are released into the atmosphere.

Korean Patent Publication No. 10-2011-0052259 Korean Patent Publication No. 10-2008-0092971

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a system capable of treating volatile organic compounds without releasing volatile organic compounds generated from crude oil carriers or the like.

According to an aspect of the present invention, there is provided a method of manufacturing a crude oil reservoir, comprising: a crude oil transfer line drawn from a lower portion of a crude oil reservoir and connected to a lower portion of the crude oil reservoir; And a mixer for liquefying the volatile organic compound transfer line connected to the eductor and the volatile organic compound transfer line connected to the rear end of the oil transfer line of the crude transfer line may be provided.

The pumping unit may be a centrifugal pump.

The crude oil reservoir also includes a first crude oil reservoir and a second crude oil reservoir, wherein the first crude oil reservoir has a smaller crude storage capacity than the second crude oil reservoir, and the first crude oil reservoir and the second crude oil reservoir And a crude oil connection line connected to the oil supply line.

The apparatus may further include an anti-pressure line branched from the volatile organic compound transfer line and connected to the second crude oil reservoir.

According to another aspect of the present invention, there is provided a method for controlling a flow rate of a crude oil, comprising: a crude oil transfer line drawn from a lower portion of a crude oil reservoir and connected to a lower portion of the crude oil reservoir; a first flow control valve installed in the crude oil transfer line; A mixer installed in the transfer line, a mixing line provided at an upstream side of the first flow control valve of the crude transfer line and connected to the mixer, a first line drawn from the upper portion of the crude reservoir and connected to the ejector, A volatile organic compound condensing system of a ship including a pressurizer, a cooler, and a pressure vessel sequentially installed on the transfer line and the first volatile organic compound transfer line may be provided.

A pumping section and an eductor and a second flow rate control valve sequentially installed between a rear end of the first flow control valve and a front end of the mixer in the crude oil transfer line are provided, And a second volatile organic compound transfer line branched from the first volatile organic compound transfer line and connected to the eductor.

The apparatus may further include a third flow control valve disposed upstream of the pressurizer of the first VOC transport line.

In addition, the cooler may be made of seawater or cooling water in a ship.

The apparatus may further include a fourth flow control valve between a downstream end of the pressure vessel of the first volatile organic compound transfer line and a front end of the ejector.

The embodiment of the present invention mixes and condenses a liquid crude oil and a volatile organic compound as a gas so as to recover crude volatile organic compounds from the storage tank to the storage tank without releasing a significant amount of volatile organic compounds generated during storage or shipping during the operation period .

In addition, since the volatile organic compound is not released to the atmosphere, air pollution can be prevented.

Further, the volatile organic compounds can be recovered again, and the main components of the crude oil can be recycled.

In addition, by using a centrifugal pump in pumping crude oil, the maintenance of the vessel is easier than in other pumps.

In addition, by mixing the crude oil and the volatile organic compound using an ejector which uses a pressurized volatile organic compound as a driving force and condensing it using a mixer, the volatile organic compound can be condensed even in the initial stage of loading the crude oil.

1 is a schematic view showing a volatile organic compound condensing system according to an embodiment of the present invention.
FIG. 2 is a view for explaining a volatile organic compound condensing method according to the volatile organic compound condensing system shown in FIG. 1. FIG.
3 is a sectional view showing an eductor applied to an embodiment of the present invention.
4 is a schematic view showing a volatile organic compound condensing system according to another embodiment of the present invention.
5 is a schematic view showing a volatile organic compound condensing system according to another embodiment of the present invention.
6 is a view for explaining a volatile organic compound condensing method according to the volatile organic compound condensing system shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is to be understood, however, that the appended drawings illustrate the present invention in order to more easily explain the present invention, and the scope of the present invention is not limited thereto. You will know.

In describing the embodiments of the present invention, it is to be noted that components having the same function are denoted by the same names and the same symbols, but substantially not identical to those of conventional storage tanks for liquid cargo.

Also, the terms used in the present application are used only to describe certain embodiments and are not intended to limit the present invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

The meanings of the front end and the rear end used in the embodiment of the present invention are defined based on the supply path of the fluid. For example, the rear end of the pressurizer means the portion of the fluid flowing out of the pressurizer.

In this application, crude oil is described for clarification of the present invention, but it is not limited to this, and it means a liquid-phase fluid in which a volatile organic compound can be generated.

1 is a schematic view showing a volatile organic compound condensing system according to an embodiment of the present invention.

1, the volatile organic compound condensation system 100 includes a crude oil reservoir 10, a crude oil transfer line 20, an eductor 30, and a volatile organic compound transfer line 40.

The crude oil reservoir 10 is installed in a crude oil carrier, a crude oil production facility or an offshore structure for storing crude oil, and provides a storage space for storing crude oil. Generally, when crude oil is loaded on the crude oil reservoir 10, the crude oil may be vaporized due to the motion of the crude oil carrier or the external environment to generate volatile organic compounds. Accordingly, the crude oil reservoir 10 has a structure capable of withstanding the internal pressure of the volatile organic compound in an appropriate amount.

The crude oil transfer line 20 is withdrawn from the bottom of the crude oil reservoir 10 and is connected again to the bottom of the crude oil reservoir 10 and a pumping portion 22 is installed in the crude oil transfer line 20.

The pumping unit 22 simultaneously pumps the crude oil stored in the crude oil reservoir 10 through the crude oil transfer line 20 while simultaneously pressurizing the pumped oil.

The pumping unit 22 may be a centrifugal pump 22.

The Centrifugal Pump uses a centrifugal force generated by rotating one or more impellers in a closed casing to perform the pump action of the liquid, that is, the action of transporting the liquid, or the pump generating the pressure It says.

 The centrifugal pump 22 is simpler in structure than other pumps and can be more easily managed in a ship.

The eductor (30) is connected to the downstream end of the pumping portion (22) of the crude oil transfer line (10). A detailed description of the eductor 30 will be given later with reference to the drawings.

The volatile organic compound transfer line 40 is drawn from the upper portion of the crude oil reservoir 10 and connected to the eductor 30 to transfer the volatile organic compounds present in the upper portion of the crude oil reservoir 10 to the eductor 30, As shown in FIG.

Meanwhile, the eductor 30 serves to suck a volatile organic compound into the eductor 30 by using pressurized crude oil, and at the same time, mix the pressurized crude oil with a volatile organic compound.

The mixer 50 is connected to the downstream end of the eductor 30 of the crude oil transfer line 10 and increases the mixing of the two-phase crude oil supplied from the eductor 30 with the volatile organic compound to condense the volatile organic compound .

The mixed fluid passing through the mixer (50) flows into the crude oil reservoir (10) having a constant fluid pressure due to the liquid level. The gaseous component of the mixed fluid that has passed through the mixer 50 can be better incorporated into the liquid component and the diameter of the gaseous component can be reduced. Also, the effect that the volatile organic compound, which is a gaseous component, is trapped by the liquid crude oil present in the lower portion of the crude oil reservoir 10 is increased, and as a result, the vaporization of the volatile organic compound can be prevented.

Meanwhile, the mixer 50 may be a static mixer 50. The static mixer uniformly mixes and discharges the mixed fluid having two or more types while flowing the fluid.

The volatile organic compound condensing system 100 capable of condensing the volatile organic compounds generated in the crude oil reservoir and returning it to the crude oil storage can be used not only for the crude oil carrier but also for all the ones using the crude oil as fuel It is applied to ships and volatile organic compounds are not discharged to the atmosphere, and air pollution can be prevented.

FIG. 2 is a view for explaining a volatile organic compound condensing method according to the volatile organic compound condensing system shown in FIG. 1. FIG.

Referring to FIG. 2, a volatile organic compound condensing method according to a volatile organic compound condensing system pumped crude oil through a pumping section 22 along a crude oil transfer line 20 connected at an oil reservoir 10.

The pumped crude oil is pressurized and flows into the eductor (30). -①

Volatile organic compounds are sucked into the eductor 30 along the volatile organic compound transfer line 40 connected to the upper portion of the crude oil reservoir 10 by using liquid crude oil flowing into the eductor 30 as a driving force. -②

Accordingly, the eductor 30 can mix the crude oil and the volatile organic compound.

The crude oil and the volatile organic compound mixed in the eductor 30 are supplied to the mixer 50 and the volatile organic compound is condensed in the mixer 50 and recovered into the crude oil reservoir 10. -③

As described above, the volatile organic compound condensing method according to this embodiment can liquefy and recycle the volatile organic compounds generated in the crude oil reservoir 10 and can prevent air pollution by not discharging the volatile organic compounds into the air .

3 is a cross-sectional view illustrating an eductor applied to an embodiment of the present invention.

A typical use of a conventional eductor is to smoothly discharge the fluid by transporting the fluid above a certain height or by using a vacuum phenomenon caused by the high velocity.

The eductor 30 shown in FIG. 3 represents an example of a general eductor, and a detailed description of the structure will be omitted.

Referring to FIG. 3, pressurized crude oil is introduced through the crude oil transfer line 20 connected to the nozzle side of the eductor 30, and pressure is lowered around the pressurized crude oil passing through the nozzle while surrounding the nozzle.

Accordingly, the volatile organic compound can be sucked through the volatile organic compound transfer line 40 connected to the upper portion of the eductor 30.

The crude oil injected from the nozzles of the eductor 30 and the volatile organic compounds sucked in can be mixed along the moving direction inside the eductor.

The eductor 30, which is applied to one embodiment of the present invention, plays a role of sucking the volatile organic compound with the pressurized crude oil as a driving force and at the same time, mixing the crude oil and the volatile organic compound.

4 is a schematic view showing a volatile organic compound condensing system according to another embodiment of the present invention.

As shown in the figure, the volatile organic compound condensing system 110 according to another embodiment of the present invention is similar to the volatile organic compound condensing system 100 of FIG. 1 described above, It will be omitted.

4, the volatile organic compound condensation system 110 includes a first crude oil reservoir 11, a second crude oil reservoir 12, a pressure resistant line 47, and a crude oil connection line 47, in accordance with one embodiment of the present invention. (13).

In the initial loading of the crude oil in the crude oil reservoir 10 according to the embodiment of the present invention, the volume of the crude oil in the liquid oil in the crude oil reservoir 10 is small and the volatile organic compound is excessively generated in the crude oil reservoir 10 It is possible.

Accordingly, in another embodiment of the present invention, crude oil is first loaded into the first crude oil reservoir 11, which is smaller in capacity than the normal crude oil storage tank of the crude oil carrier.

In the first crude oil reservoir 11, an inert gas such as nitrogen is filled.

The second crude oil reservoir 12 has a larger crude oil storage capacity than the first crude oil reservoir 11, and may have a plurality of unlike.

Pressure resistant line 47 branches off from the volatile organic compound transfer line 40 and is connected to the second crude oil reservoir 12.

The pressure-resistant line 47 is provided with a fifth flow control valve 48 for controlling the movement of the volatile organic compound.

A sixth flow control valve 46 is provided in the volatile organic compound transfer line 40.

Wherein when the crude oil is stored in the first crude oil reservoir 11 in an amount less than about 1/3 of the storage capacity of the first crude oil reservoir 11 and when the crude oil is supplied to the first crude oil reservoir 11, 46 is closed and the fifth flow control valve of the pressure-resistant line 47 is opened.

In addition, the first crude oil reservoir 11 may be provided with a level gauge for measuring the crude oil storage capacity.

As the crude oil is vaporized into volatile organic compounds due to the initial crude oil supply to the first crude oil reservoir 11, the internal pressure of the first crude oil reservoir 11 may increase.

The volatile organic compound may be supplied to the lower portion of the second crude oil reservoir 12 along with the pressure resistant line 47 together with an inert gas such as nitrogen.

Since the molecular weight of the volatile organic compound is relatively large as compared with the inert gas, the volatile organic compounds introduced into the second crude oil reservoir 12 may flow downward, and the inert gas may be decomposed into volatile organic compounds It can be raised to the top by the sinking flow. As the volatile organic compound moves to the second crude oil reservoir 12, the internal pressure of the first crude oil reservoir 11 can be reduced.

On the other hand, when the crude oil is stored in the first crude oil reservoir 11 in an amount of about 1/3 or more of the storage capacity, when the crude oil is supplied to the first crude oil reservoir 11, (48) is closed and the sixth flow control valve (46) of the pressure resistant line (47) is opened.

The process by which the volatile organic compound can be condensed through the eductor 30 and the mixer 50 has already been described above, so a detailed description thereof will be omitted.

When the crude oil is supplied to the first crude oil reservoir 11, a certain amount of the crude oil is secured in the first crude oil reservoir 11, so that the space in which the crude oil is vaporized into the volatile organic compound can be reduced do.

When crude oil is supplied to the first crude oil reservoir 11, the crude oil is supplied to the crude oil reservoir 12 through the crude oil connection line 13.

By supplying the crude oil first to the first crude oil reservoir 11 which can correspond to the auxiliary tank without directly supplying the crude oil to the second crude oil reservoir 12 which may correspond to the crude oil storage tank, ) Can be increased to a total capacity which can be stacked and a capacity ratio of the crude oil to be loaded can be increased so that the space where the crude oil can be vaporized by the volatile organic compound can be reduced and the excessive generation of volatile organic compounds in the initial shipment stage of the crude oil can be suppressed.

 In this way, the volatile organic compound condensing system 110 according to another embodiment of the present invention can use the first crude oil reservoir 11, which can correspond to the auxiliary tank in the crude oil storage tank, Volatile organic compounds can be reduced.

5 is a schematic view showing a volatile organic compound condensing system according to another embodiment of the present invention.

As shown in the figure, the volatile organic compound condensing system 200 according to another embodiment of the present invention is similar to the volatile organic compound condensing system 100 of FIG. 1 described above, It will be omitted.

5, the volatile organic compound condensation system 200 may include an ejector 80, a mixing line 90, a first volatile organic compound transfer line 70, and a second volatile organic < RTI ID = 0.0 > And further includes a compound transfer line (41).

The crude oil transfer line (20) is provided with a first flow control valve (23). The first flow control valve 23 is a valve for controlling volatile organic compounds in the crude oil reservoir 10 by using the eductor 30 and the mixer 50 when the volatile organic compound is excessively generated in the crude oil reservoir 10, Thereby preventing the system from condensing.

The mixing line 90 is provided with an ejector 80 and branched at the front end of the first flow control valve 23 of the crude oil transfer line 20 and connected to the mixer 50.

In general, an ejector ejects a liquid having a high pressure from an ejection port at a high speed to draw the fluid around the ejection port, or eject the gas at a high speed to make the surroundings vacuum.

The ejector 80 functions to suck the crude oil from the crude oil reservoir 10 to the ejector 80 by using a volatile organic compound that is pressurized through a first volatile organic compound transfer line 70 At the same time, it plays a role of mixing the crude oil and the volatile organic compound.

The first volatile organic compound transfer line 70 is drawn from the top of the crude oil reservoir 10 and connected to the ejector 80. A third flow control valve 71, a pressurizer 72, a cooler 73, a pressure vessel 74, and a fourth flow control valve 75, which are sequentially installed, are installed in the first volatile organic compound transfer line 70 do.

The third flow control valve 71 can be opened when an excessive amount of volatile organic compounds are generated in the crude oil reservoir 10. The third flow control valve 71 may be closed when the first flow control valve 23 is opened and may be opened when the first flow control valve 23 is closed.

The pressurizer 72 pressurizes the volatile organic compound to a pressure of about 25 bar to be conveyed along the first volatile transfer line 70.

The cooler 73 cools the pressurized volatile organic compound using seawater or cooling water in the vessel.

The pressure vessel 74 provides a space through which the volatile organic compounds transferred through the cooler 73 can reach a certain pressure.

When the volatile organic compound reaches a predetermined pressure, that is, a pressure capable of providing a driving force to the ejector, which will be described later, the fourth flow control valve 75 flows into the ejector 80 So that it can be controlled.

The second volatile organic compound transfer line 41 is similar to the volatile organic compound transfer line 40 of FIG. 1 but is branched at the front end of the third flow control valve 71 of the first volatile organic compound transfer line 70 , And a second flow control valve (42) is installed in the second volatile organic compound transfer line (41).

The second flow control valve 42 can be operated to open and close the third flow control valve 71 in reverse.

The mixer 50 has the same function as described above, but is connected to the ejector 80, unlike the embodiment of the present invention. Accordingly, the mixing ratio of the crude oil mixed with the volatile organic compound through the ejector 80 increases and the volatile organic compound can be condensed.

6 is a view for explaining a volatile organic compound condensing method according to the volatile organic compound condensing system shown in FIG.

6, when a volatile organic compound is generated in an excessive amount in the crude oil reservoir 10 such as an initial stage of crude oil shipment and the amount of the crude oil in the liquid oil is relatively small in the crude oil reservoir 10 A first flow control valve 23 provided on the crude oil transfer line 20 and a second flow control valve 42 provided on the second volatile organic compound transfer line 41 are closed.

At this time, the third flow control valve 71 is opened and the volatile organic compound is pressurized to about 25 bar through the pressurizer 72.

Thereafter, the pressurized volatile organic compound is cooled through the cooler 73 and compressed to a predetermined pressure in the pressure vessel 74.

The pressurized volatile organic compound is introduced into the ejector 80 by opening the fourth flow control valve 75 when a predetermined pressure, that is, a pressure sufficient to generate the driving force of the ejector 80 is reached. -④

And the crude oil is sucked into the ejector (80) through the crude oil transfer line (20) using the high-pressure volatile organic compound introduced into the ejector (80) as a driving force. -⑤

Accordingly, the volatile organic compound and crude oil can be mixed in the ejector 80.

In addition, the mixed volatile organic compound and crude oil are transferred to the mixer 50 along the mixing line 90. -⑥

The mixing ratio of the volatile organic compound and the crude oil mixed by the mixer 50 is increased and the volatile organic compound can be condensed.

As described above, the method of condensing volatile organic compounds according to another embodiment of the present invention is different from the embodiment of the present invention. The volatile organic compounds can be condensed and recovered to the crude oil reservoir 10 even if the amount of crude oil is relatively small at the initial stage of shipment.

In addition, air pollution can be prevented because the volatile organic compounds are not released to the atmosphere.

It will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention as defined by the appended claims, It is obvious.

10, 11: Crude Oil Storage
12: Crude oil storage tank
20: Crude oil transfer line
22: Centrifugal pump
30: eductor
40: Volatile organic compound transfer line
41: second volatile organic compound transfer line
42: second flow control valve
46: fifth flow control valve
47: pressure-proof line
48: Sixth flow control valve
50: Mixer
70: First volatile organic compound transfer line
71: third flow control valve
72: Presser
73: Pressure vessel
75: fourth flow control valve
80: Ejector
90: Mixed line

Claims (5)

A crude oil transfer line drawn from the bottom of the crude oil reservoir and connected to the bottom of the crude oil reservoir again;
A first flow control valve installed in the crude oil transfer line;
A mixer installed in the crude oil transfer line at a rear end of the first flow control valve;
A mixing line provided with an ejector, branched from the upstream of the first flow control valve of the crude oil transfer line and connected to the mixer;
A first volatile organic compound transfer line drawn from an upper portion of the crude oil reservoir and connected to the ejector; And
A pressurizer, a cooler, and a pressure vessel sequentially installed on the first volatile organic compound transfer line;
And a volatile organic compound condensing system. The method according to claim 1,
A pumping section and an eductor sequentially installed between a rear end of the first flow control valve and a front end of the mixer in the crude oil transfer line; And
A second volatile organic compound transfer line branched from the front end of the pressurizer of the first volatile organic compound transfer line and connected to the eductor,
Further comprising a volatile organic compound condensation system. The method according to claim 1,
And a third flow control valve installed at a front end of the pressurizer of the first volatile organic compound transfer line. The method according to claim 1,
Wherein the cooler comprises seawater or cooling water in a ship. The method according to claim 1,
Further comprising a fourth flow control valve between a downstream end of the pressure vessel of the first volatile organic compound transfer line and the front end of the ejector.

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