KR20160088678A - MEG regeneration system using waste heat - Google Patents

MEG regeneration system using waste heat Download PDF

Info

Publication number
KR20160088678A
KR20160088678A KR1020150008069A KR20150008069A KR20160088678A KR 20160088678 A KR20160088678 A KR 20160088678A KR 1020150008069 A KR1020150008069 A KR 1020150008069A KR 20150008069 A KR20150008069 A KR 20150008069A KR 20160088678 A KR20160088678 A KR 20160088678A
Authority
KR
South Korea
Prior art keywords
meg
rich
distillation tower
waste heat
rich meg
Prior art date
Application number
KR1020150008069A
Other languages
Korean (ko)
Inventor
김윤기
최용석
이윤주
안재완
나희승
Original Assignee
대우조선해양 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 대우조선해양 주식회사 filed Critical 대우조선해양 주식회사
Priority to KR1020150008069A priority Critical patent/KR20160088678A/en
Publication of KR20160088678A publication Critical patent/KR20160088678A/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/0011—Heating features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/10—Vacuum distillation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/14—Fractional distillation or use of a fractionation or rectification column
    • B01D3/32—Other features of fractionating columns ; Constructional details of fractionating columns not provided for in groups B01D3/16 - B01D3/30

Abstract

The present invention relates to an MEG regeneration system using waste heat. According to the present invention, provided is the MEG regeneration system using waste heat, which comprises: a distillation tower which receives rich mono-ethylene glycol (MEG), and which eliminates water from the rich MEG; and a heat exchanger which is installed in front of a pretreatment vessel disposed in front of the distillation tower, and which heats passing rich MEG through heat exchange with high-temperature condensate water discharged from a top of the distillation tower. According to the present invention, in regeneration of MEG, waste heat of high-temperature lean MEG, condensate water or reflux is recovered and used to heat rich MEG, and thus energy efficiency can be increased and operating expenditure (OPEX) can be reduced.

Description

[0001] MEG regeneration system using waste heat [0002]

The present invention relates to a MEG regeneration system, and more particularly, to an apparatus and method for recovering waste heat to increase energy efficiency when a slip stream concept is applied in an MEG regeneration process, which is one of ocean topside processes. And an MEG regeneration system using the waste heat.

In general, MEG (Mono Ethylene Glycol) is widely used as an antifreeze. It is a thermodynamic hydrate inhibitor (THI) that fundamentally blocks the hydrate generation in the subsea pipeline during subsea drilling. Is used.

1 is a block diagram illustrating a conventional MEG circulation system.

As shown in FIG. 1, the conventional MEG circulation supply system 10 injects the MEG generated in the topside located on the sea floor into a wellhead 1 located on the sea floor, To prevent the generation of the data. The MEG moves to the separator 11 together with the water generated from the well head 1 so that water and gas are primarily separated and then supplied to the MEG regeneration package 12. The separator 11 separates the gas and the condensate from the rich MEG moved from the well head 1 and is sent for gas treatment and condensate treatment. The MEG regeneration package 12 receives rich MEG containing a large amount of water and salt components from the separator 11 and removes water and salt components from the separator 11 to remove the finally generated Lean MEG into the well head 1 .

As described above, the MEG regeneration process using the Slip Stream Concept is composed of an atmospheric distillation process for separating water and MEG, and a vacuum distillation process for removing salts in a water / MEG mixed solution, and is responsible for heating and cooling Is one of the largest topside processes. The large burden of heating and cooling means that the operating expense (OPEX) required for operation of the process is large, so it is very important to design an optimized process in terms of energy. Therefore, there is a need to increase the energy efficiency in the conventional MEG regeneration process.

1. International Publication No. WO2014 / 036253, "PROCESS, METHOD, AND SYSTEM FOR REMOVING HEAVY METALS FROM FLUIDS" 2. U.S. Pub. No. 2008/0023071, "HYDRATE INHIBITED LATEX FLOW IMPROVER"

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a method and apparatus for recovering waste heat to be used for heating a rich MEG in MEG regeneration, thereby improving energy efficiency and reducing operating expense There is a purpose to reduce.

According to an aspect of the present invention, there is provided a MEG (Mono Ethylene Glycol) regeneration system, comprising: a distillation tower which receives rich MEG and removes water from the rich MEG; And a heat exchanger installed at a front end of the pretreatment vessel installed at a front end of the distillation tower and heating the passing rich MEG by heat exchange with the high temperature condensate discharged from the top of the distillation tower do.

The MEG regeneration system includes a pretreatment vessel for removing a divalent salt from a rich MEG and a rich MEG provided at a front end of the pretreatment vessel for performing heat exchange with a condensate at a high temperature discharged from the top of the distillation tower A pretreatment unit including a heat exchanger for heating by the heat exchanger; A re-concentrating unit including a distillation tower which receives a rich MEG from the pretreatment unit and removes water from the rich MEG; And a regenerator including a flash separator for removing salts remaining in the lean MEG passed through the re-condenser.

The distillation column can remove water from the rich MEG by an atmospheric distillation process.

The flash separator can remove salts from the lean MEG by a vacuum distillation process.

According to another aspect of the present invention, in the MEG regeneration system, the high-temperature rich MEG is heated using the high-temperature condensate discharged from the top of the distillation tower, so that the high-temperature condenser cooling cooler is not installed Is provided.

According to the present invention, in the MEG regeneration, waste heat of lean MEG, condensed water or reflux at a high temperature is recovered and used for heating of a rich MEG, Thereby reducing the operating expense (OPEX).

1 is a block diagram illustrating a conventional MEG circulation system.
2 is a configuration diagram illustrating an MEG regeneration system using waste heat according to the first embodiment of the present invention.
3 is a block diagram showing a MEG regeneration system using waste heat according to a second embodiment of the present invention.
FIG. 4 is a block diagram showing a MEG reproducing system using waste heat according to a third embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the following examples can be modified in various forms, and the scope of the present invention is not limited to the following examples.

2 is a configuration diagram illustrating an MEG regeneration system using waste heat according to the first embodiment of the present invention.

2, the MEG regeneration system 1000 using the waste heat according to the first embodiment of the present invention is configured to heat a rich MEG (Rich Mono Ethylene Glycol) by a waste heat recovery unit using waste heat in the system 1000 For this purpose, for example, it includes a distillation column 210 for removing water from the rich MEG, for example, a rich MEG, and a waste heat recovery unit for heating the rich MEG before being supplied to the distillation column 210 using waste heat in the system 1000 do. The waste heat recovering unit may be installed at a front end of the distillation tower 210 in the present embodiment and the rich MEG passing through the waste heat recovering unit may be introduced into a lean line at a high temperature through the reboiler 270 located at the rear end of the distillation tower 210, And a heat exchanger 400 for heating by heat exchange with MEG.

The heat exchanger 400 causes the rich MEG passing through the first transfer line 120 to be heated by heat exchange with the lean MEG passing through the heat exchange line 410. Where the heat exchange line 410 may be provided to extend from a second transfer line 260 for transferring the lean MEG.

The MEG regeneration system 1000 using waste heat according to the first embodiment of the present invention includes a pretreatment section 100 for precipitating divalent ions from the MEG, a reconditioning section 100 for separating water from the MEG, 200), and a Reclamation Section (300) for lowering the salt concentration of the exiting MEG.

The pretreatment unit 100 supplies a rich MEG having passed through a separator from a well head to a pretreatment vessel 110 through a supply line 150 and a pre- The rich MEG precipitated is supplied to the re-condensing unit 200 through the first transfer line 120. The pretreatment vessel 110 is provided with an exhaust line 114 for exhausting. A recycle heater 140 for heating the rich MEG is installed in the re-supply line 121 branched from the first transfer line 120 and connected to the supply line 150.

The pretreatment unit 100 removes divalent salts from the pretreatment vessel 110 by using the property that the divalent salt components such as Fe 2+ , Mg 2+ , and CO 3 2- precipitate well as the temperature increases. Since the temperature of the rich MEG entering the pretreatment vessel 110 is low, the temperature is increased using the recycle heater 140 to create a condition in which the salt is likely to precipitate. The precipitated divalent salt can be removed from a centrifuge installed between the pretreatment unit 100 and the recondensation unit 200.

The re-condenser 200 is provided with a distillation column 210 through which the rich MEG is supplied through the first transfer line 120 and a lean MEG in which water is separated from the distillation column 210 is supplied to the second transfer line 260 To the playback unit 300 through the playback unit 300. A reflux line 220 for circulating the reflux is connected to the top of the distillation column 210 and a reflux condenser 230 for condensing and transferring the reflux is connected to the reflux line 220. [ A reflux drum 240, and a reflux pump 250 are installed, respectively. The reflux line 220 is connected to a discharge line 221 for discharging the condensed water. An exhaust line 241 for exhaust is connected to the reflux drum 240. A second transfer line 260 is provided with a MEG Reboiler 270 for heating the MEG and a recovery line 271 for recovering and circulating the MEG to the distillation column 210 is connected to the reboiler 270, do.

The re-condensing unit 200 uses an atmospheric distillation method using the distillation tower 210 and the reboiler 270 by using boiling point difference between the two materials having a boiling point of water of about 100 ° C at normal pressure and a boiling point of MEG of about 200 ° C Water and MEG are easily separated. That is, water is removed from the rich MEG through re-concentration, and the lean MEG from which the water is removed is transferred to the regeneration unit 300.

The regenerating unit 300 includes a flash separator 310 to which a lean MEG is supplied through a second transfer line 260 and a condenser 320 and a drum 330 are installed. A suction line 331 for connection to the vacuum pump side is connected to the drum 330. A discharge line 340 is connected to the bottom of the flash separator 310 to discharge a slurry fluid to the centrifuge and a circulation line 341 is branched to the discharge line 340 to be connected to the separator 310 . The discharge line 340 is provided with a flash pump 350 and the circulation line 341 is provided with a recycle heater 360.

Since the lean MEG that has passed through the recondenser 200 still contains a large amount of salt component, the regeneration unit 300 performs a process of removing the salt from the lean MEG before injecting the lean MEG into the wellhead of the seabed do. The key to this salt removal process is a vacuum distillation technique using a principle of easy evaporation in a vacuum state. This is a vacuum distillation technique in which a vacuum is formed on the flash separator 310 to evaporate the salt, (310) and removed through a centrifuge.

According to the MEG regeneration system 1000 using the waste heat according to the first embodiment of the present invention, the lean MEG at a high temperature passing through the reboiler 270 is heat-exchanged with the rich MEG stream entering the distillation tower 210 Thereby raising the temperature of the rich MEG, thereby reducing the burden on the reboiler 270. The lean MEG at high temperature past the distillation tower 210 must be cooled before being stored in the tank and the rich MEG entering the distillation tower 210 must be at a high temperature so that the two streams undergo heat exchange, Simultaneously reduce it.

Lin MEG, which is the final product that has passed through the regeneration unit 300, has a high temperature of 150 ° C or higher. Generally, such a high temperature lean MEG should be cooled before it is sent to the tank. In addition to using the waste heat of the lean MEG by the heat exchanger 400, it also reduces the cooling burden of the lean MEG. In addition, the heat exchanger 400 performs heat exchange between a lean MEG at a high temperature of 100 to 150 ° C and a relatively low-temperature rich MEG, thereby reducing the heating burden of the rich MEG. The heating effect of the rich MEG is such that the flow rate of the MEG becomes large The greater the effect, the better.

3 is a block diagram showing a MEG regeneration system using waste heat according to a second embodiment of the present invention.

3, the MEG regeneration system 2000 using the waste heat according to the second embodiment of the present invention is configured to regulate a rich MEG (Mono Ethylene Glycol) by a waste heat recovery unit using waste heat in the system 2000, For example, the waste heat recovering unit is installed at the front end of the pretreatment vessel 110 installed at the front end of the distillation tower 210, and the rich MEG passing therethrough is discharged from the top of the distillation tower 210 And a heat exchanger 500 for heating by heat exchange with the condensed water. The heat exchanger 500 allows the rich MEG passing through the first transfer line 120 to be heated by heat exchange with the condensate discharged from the top of the distillation column 210 through the discharge line 510.

Meanwhile, the MEG reproducing system 2000 using the waste heat according to the second embodiment of the present invention uses the same symbols as those of the MEG reproducing system 1000 using the waste heat according to the first embodiment of the present invention, Will be omitted.

As described above, according to the MEG regeneration system 2000 using the waste heat according to the second embodiment of the present invention, the temperature of the condensate, which is the final product of the top of the distillation column 210, is higher than the temperature of the rich MEG stream. Thus, by making the condensed water perform heat exchange with the rich MEG in the heat exchanger 500, the temperature of the rich MEG is raised, thereby utilizing the waste heat of the condensed water. In addition, since the condensed water passing through the heat exchanger 500 automatically decreases in temperature, there is no need to separately install a condensate water cooler required in the conventional process.

FIG. 4 is a block diagram showing a MEG reproducing system using waste heat according to a third embodiment of the present invention.

4, the MEG regeneration system 3000 using the waste heat according to the third embodiment of the present invention is configured to regenerate a rich MEG (Mono Ethylene Glycol) by a waste heat recovery unit using waste heat in the system 1000, For example, the waste heat recovering unit is installed to condense reflux circulating and supplied to the distillation tower 210, and is disposed in the front end of the distillation tower 210, And a reflux condenser 600 for heating the MEG by heat exchange with a high-temperature reflux condenser. The reflux condenser 600 receives the rich MEG from the front end of the pretreatment vessel 110 by the heat exchange line 610 provided with the flow control valve 620 for opening and closing the circulation of the rich MEG. Therefore, the rich MEG circulation amount to the reflux condenser 600 side is controlled by the operation of the flow rate control valve 620.

The MEG reproducing system 3000 using the waste heat according to the third embodiment of the present invention is similar to the MEG reproducing system 1000 using the waste heat according to the first embodiment of the present invention, Will be omitted.

According to the MEG regeneration system 3000 using the waste heat according to the third embodiment of the present invention, the reflux condenser 600 has a cooling load that is as great as the heating load of the reboiler 270, The reflux condenser 600 can use the rich MEG at the front end of the pretreatment vessel 110 instead of the cooling water as the refrigerant. The rich MEG heat exchanged in the reflux condenser 600 flows into the pretreatment vessel 110.

In the conventional process, when cooling water is used to condense the vapor in the reflux condenser 600, but when the rich MEG is replaced with the rich MEG at the front of the pretreatment vessel 110, the rich MEG has an effect of preheating, 140 can be reduced, and cooling water is not required to be used on the low-temperature side, thereby reducing the burden on cooling. Also, by providing a flow control valve 620 in the heat exchange line 610 according to the required cooling load, the desired amount of rich MEG can be adjusted to heat exchange.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. It is.

100: Pretreatment unit 110: Pretreatment vessel
114: exhaust line 120: first conveyance line
121: Re-supply line 130: Recycle pump
140: Recycle heater 150: Supply line
200: Re-condenser 210: Distillation tower
220: Reflux line 221: Discharge line
230: Reflux condenser 240: Reflux drum
241: exhaust line 250: reflux pump
260: second transfer line 270: reboiler
271: Collection line 300:
310: flash separator 320: condenser
330: Drum 331: Suction line
340: discharge line 341: circulation line
350: Flash pump 360: Recycle heater
400, 500: heat exchanger 410, 610: heat exchange line
510: discharge line 600: reflux condenser
620: Valve

Claims (5)

In a MEG (Mono Ethylene Glycol) regeneration system,
A distillation tower which receives the rich MEG and removes water from the rich MEG; And
And a heat exchanger installed at a front end of the pretreatment vessel installed at a front end of the distillation tower and heating the passing rich MEG through heat exchange with the high temperature condensate discharged from the top of the distillation tower. The method according to claim 1,
The MEG reproduction system includes:
A pretreatment vessel for removing divalent salts from the rich MEG and a heat exchanger installed at the front end of the pretreatment vessel for heating the passing rich MEG by heat exchange with the high temperature condensate discharged from the top of the distillation tower A preprocessing unit including;
A re-concentrating unit including a distillation tower which receives a rich MEG from the pretreatment unit and removes water from the rich MEG; And
And a regeneration section including a flash separator for removing salts remaining in the lean MEG that has passed through the re-enrichment section. The method according to claim 1,
Wherein the distillation column removes water from the rich MEG by an atmospheric distillation process. The method of claim 2,
Wherein the flash separator removes salt from the lean MEG by a vacuum distillation process. In the MEG regeneration system,
Wherein the cooler for cooling the high-temperature condensate water is not installed by heating the relatively low-temperature rich MEG using the high-temperature condensate discharged from the top of the distillation tower.
KR1020150008069A 2015-01-16 2015-01-16 MEG regeneration system using waste heat KR20160088678A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150008069A KR20160088678A (en) 2015-01-16 2015-01-16 MEG regeneration system using waste heat

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150008069A KR20160088678A (en) 2015-01-16 2015-01-16 MEG regeneration system using waste heat

Publications (1)

Publication Number Publication Date
KR20160088678A true KR20160088678A (en) 2016-07-26

Family

ID=56680885

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150008069A KR20160088678A (en) 2015-01-16 2015-01-16 MEG regeneration system using waste heat

Country Status (1)

Country Link
KR (1) KR20160088678A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200144012A (en) * 2019-06-17 2020-12-28 한국조선해양 주식회사 Gas treating system and marine structure including the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080023071A1 (en) 2006-07-28 2008-01-31 Smith Kenneth W Hydrate inhibited latex flow improver
WO2014036253A2 (en) 2012-08-30 2014-03-06 Chevron U.S.A. Inc. Process, method, and system for removing heavy metals from fluids

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080023071A1 (en) 2006-07-28 2008-01-31 Smith Kenneth W Hydrate inhibited latex flow improver
WO2014036253A2 (en) 2012-08-30 2014-03-06 Chevron U.S.A. Inc. Process, method, and system for removing heavy metals from fluids

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200144012A (en) * 2019-06-17 2020-12-28 한국조선해양 주식회사 Gas treating system and marine structure including the same

Similar Documents

Publication Publication Date Title
KR101665453B1 (en) MEG regeneration system
KR101670878B1 (en) MEG Regeneration System
KR101665452B1 (en) MEG regeneration system
MX2011009875A (en) Efficient methods for operation with high pressure liquids.
NO20111157A1 (en) Hydrate inhibitor regeneration process
CN112274958A (en) Ethylene glycol regeneration and recovery system and ethylene glycol recovery method in deep sea natural gas development process
TW201315529A (en) Heat recovery in absorption and desorption processes
CN104707352A (en) Desalting regeneration device of salt-containing ethylene glycol solution
KR20160088678A (en) MEG regeneration system using waste heat
CN104312638B (en) Thermal coupling negative pressure benzene removal, regeneration integrated apparatus
KR20150069389A (en) A natural gas regeneration system
JP5218895B2 (en) Method and apparatus for transporting hot spring water or geothermal water that does not cause carbonate scale failure
US10213705B2 (en) Process for recovering processing liquids from streams containing alkaline earth metal salts
CN209052601U (en) A kind of desalination regenerating unit of saliferous ethylene glycol rich solution
KR20180078092A (en) Salt Removal Using Temperature Swing in MEG Regeneration System
US11446603B2 (en) Acid gas removal system for removing acidic gases from gaseous hydrocarbons
JPH037893A (en) Cleaning method of oil heat exchanger in recovery process of coarse light oil in coke oven gas
KR102373290B1 (en) MEG regeneration system and marine structure including the same
KR102239296B1 (en) Gas treating system and marine structure including the same
CN114212937B (en) System and method for treating water and comprehensively utilizing heat energy of deep coal mine
KR101767553B1 (en) MEG Regeneration System
CN104629818B (en) Vacuum carbonate desulphurization rich solution economic benefits and social benefits desorption technique and system
KR20140041764A (en) Method and apparatus for circulating a glycol stream containing a concentration of divalent cations, and method of producing a natural gas product stream
US10822294B2 (en) Device for regenerating mono-ethylene glycol and method for regenerating mono-ethylene glycol
KR102373291B1 (en) MEG regeneration system and marine structure including the same

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E601 Decision to refuse application