CN114191836A - Triethylene glycol dewatering device and natural gas dewatering system - Google Patents
Triethylene glycol dewatering device and natural gas dewatering system Download PDFInfo
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- CN114191836A CN114191836A CN202010910570.XA CN202010910570A CN114191836A CN 114191836 A CN114191836 A CN 114191836A CN 202010910570 A CN202010910570 A CN 202010910570A CN 114191836 A CN114191836 A CN 114191836A
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- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 title claims abstract description 299
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 116
- 239000003345 natural gas Substances 0.000 title claims abstract description 59
- 230000018044 dehydration Effects 0.000 claims abstract description 85
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 85
- 239000007788 liquid Substances 0.000 claims description 88
- 238000010521 absorption reaction Methods 0.000 claims description 39
- 238000004891 communication Methods 0.000 claims description 12
- 230000004308 accommodation Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 13
- 208000005156 Dehydration Diseases 0.000 description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 58
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 11
- 238000012546 transfer Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 238000009835 boiling Methods 0.000 description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 description 5
- 239000001569 carbon dioxide Substances 0.000 description 5
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- AEDZKIACDBYJLQ-UHFFFAOYSA-N ethane-1,2-diol;hydrate Chemical compound O.OCCO AEDZKIACDBYJLQ-UHFFFAOYSA-N 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Chemical group CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- UWHCKJMYHZGTIT-UHFFFAOYSA-N tetraethylene glycol Chemical compound OCCOCCOCCOCCO UWHCKJMYHZGTIT-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- 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
- B01D3/143—Fractional distillation or use of a fractionation or rectification column by two or more of a fractionation, separation or rectification step
- B01D3/146—Multiple effect 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
- B01D3/322—Reboiler specifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
- C10L3/106—Removal of contaminants of water
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Drying Of Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The disclosure relates to a triethylene glycol dewatering device and a natural gas dewatering system, and belongs to the field of natural gas dewatering. The reboiler has a first inlet and a first outlet. The first buffer tank is provided with a second inlet, a second outlet, a third inlet, a third outlet and a first accommodating cavity, the second inlet and the second outlet are respectively communicated with the first accommodating cavity, the third inlet and the third outlet are isolated from the first accommodating cavity, the second inlet is communicated with the first outlet, the second outlet is used for outputting triethylene glycol lean solution, the third inlet is used for inputting triethylene glycol rich solution, and the third outlet is communicated with the first inlet. The first heat exchanger is arranged in the first accommodating cavity and provided with a first heat exchange inlet and a first heat exchange outlet which are communicated with each other, the first heat exchange inlet and the first heat exchange outlet are respectively arranged at two opposite ends of the first buffer tank, the first heat exchange inlet is communicated with the third inlet, and the first heat exchange outlet is communicated with the third outlet. The triethylene glycol rich solution with higher temperature does not pass through the low temperature end, and the dehydration effect is not influenced.
Description
Technical Field
The disclosure relates to the field of natural gas dehydration, in particular to a triethylene glycol dehydration device and a natural gas dehydration system.
Background
Natural gas produced from a well head contains moisture, and the presence of moisture in natural gas often has serious consequences. For example, the water can form acidic substances with carbon dioxide or hydrogen sulfide in natural gas, and cause corrosion to transportation pipelines or equipment; meanwhile, the water in the natural gas can reduce the pipeline conveying capacity, and unnecessary power consumption is caused. The natural gas needs to be dehydrated during transportation and storage.
In the dehydration process of natural gas, the natural gas is generally sent into an absorption tower, triethylene glycol is distributed in the absorption tower, and the natural gas is contacted with the triethylene glycol in the absorption tower. Triethylene glycol is easily dissolved in water, water in the natural gas is absorbed by a triethylene glycol lean solution (triethylene glycol liquid with low water content) in the absorption tower to form a triethylene glycol rich solution (triethylene glycol liquid with high water content), and the triethylene glycol rich solution is discharged from the absorption tower. And dehydrating the discharged triethylene glycol rich solution to generate triethylene glycol barren solution again and using the triethylene glycol barren solution for dehydrating natural gas. The temperature of triethylene glycol barren solution formed by dehydrating triethylene glycol is very high, and the triethylene glycol barren solution is sent into an absorption tower after being cooled.
And (3) dehydrating the triethylene glycol rich solution through a reboiler, dehydrating the triethylene glycol rich solution to obtain a triethylene glycol barren solution, carrying out heat exchange on the triethylene glycol barren solution obtained after dehydration and the triethylene glycol rich solution discharged from the absorption tower, reducing the temperature of the triethylene glycol barren solution obtained after dehydration, increasing the temperature of the triethylene glycol rich solution, and then feeding the triethylene glycol rich solution with the increased temperature into the reboiler for dehydration. In the related art, the temperature of the triethylene glycol rich liquid after heat exchange is not high enough, and when the triethylene glycol rich liquid enters a reboiler, water vapor in the reboiler is easily condensed into liquid water, so that the dehydration effect is affected.
Disclosure of Invention
The embodiment of the disclosure provides a triethylene glycol dehydration device and a natural gas dehydration system, which can increase the temperature of triethylene glycol rich liquid after heat exchange. The technical scheme is as follows:
in one aspect, the present disclosure provides a triethylene glycol dehydration apparatus, comprising:
a reboiler having a first inlet and a first outlet;
a first buffer tank having a second inlet, a second outlet, a third inlet, a third outlet and a first accommodating chamber, wherein the second inlet and the second outlet are respectively communicated with the first accommodating chamber, the third inlet and the third outlet are isolated from the first accommodating chamber, the second inlet is communicated with the first outlet, the second outlet is used for outputting a triethylene glycol lean solution, the third inlet is used for inputting a triethylene glycol rich solution, and the third outlet is communicated with the first inlet);
the first heat exchanger is positioned in the first accommodating cavity and provided with a first heat exchange inlet and a first heat exchange outlet which are communicated with each other, the first heat exchange inlet and the first heat exchange outlet are respectively positioned at two opposite ends of the first buffer tank, the first heat exchange inlet is communicated with the third inlet, and the first heat exchange outlet is communicated with the third outlet.
In one implementation of the disclosed embodiment, the reboiler is located above the first buffer tank in a vertical direction;
the first outlet is located at the bottom end of the reboiler and the second inlet is located at the top end of the first buffer tank.
In one implementation manner of the embodiment of the present disclosure, the triethylene glycol dehydration apparatus further includes:
the rectification column is provided with a fourth inlet, a fourth outlet, a fifth inlet, a fifth outlet and a second containing cavity, the fourth inlet and the fourth outlet are respectively communicated with the second containing cavity, the fifth inlet and the fifth outlet are isolated from the second containing cavity, the fourth inlet is communicated with the third outlet, the fourth outlet is communicated with the first inlet, the fifth inlet is used for inputting triethylene glycol rich liquid to be dehydrated, and the fifth outlet is communicated with the third inlet;
the preheater is located in the second accommodating cavity and is provided with a preheating inlet and a preheating outlet which are communicated with each other, the preheating inlet is communicated with the fifth inlet, and the preheating outlet is communicated with the fifth outlet.
In one implementation manner of the embodiment of the present disclosure, the triethylene glycol dehydration apparatus further includes:
a second buffer tank having a sixth inlet, a sixth outlet, a seventh inlet, a seventh outlet, and a third accommodating chamber, wherein the sixth inlet and the sixth outlet are respectively communicated with the third accommodating chamber, the seventh inlet and the seventh outlet are isolated from the third accommodating chamber, the sixth inlet is communicated with the second outlet, the sixth outlet is used for outputting a triethylene glycol lean solution, the seventh inlet is communicated with the fifth outlet, and the seventh outlet is communicated with the third inlet;
and the second heat exchanger is positioned in the third accommodating cavity, the second heat exchanger is provided with a second heat exchange inlet and a second heat exchange outlet which are communicated with each other, the second heat exchange inlet is communicated with the seventh inlet, and the second heat exchange outlet is communicated with the third inlet.
In one implementation manner of the embodiment of the present disclosure, the triethylene glycol dehydration apparatus further includes:
a flash tank having a flash inlet in communication with the seventh outlet and a flash outlet in communication with the third inlet.
In another aspect, the present disclosure provides a natural gas dehydration system, which includes the triethylene glycol dehydration apparatus according to any one of the above aspects and an absorption tower.
In one implementation of the disclosed embodiment, the absorption tower has a triethylene glycol rich liquid outlet and a triethylene glycol lean liquid inlet, the third inlet is in communication with the triethylene glycol rich liquid outlet, and the second outlet is in communication with the triethylene glycol lean liquid inlet.
In one implementation of the disclosed embodiment, the natural gas dehydration system further includes:
a third buffer tank having an eighth inlet, an eighth outlet, and a fourth holding chamber, the eighth inlet being in communication with the second outlet, the eighth outlet being in communication with the triethylene glycol lean liquid inlet;
and the third heat exchanger is positioned in the fourth accommodating cavity, the third heat exchanger is provided with a third heat exchange inlet and a third heat exchange outlet which are communicated with each other, the third heat exchange inlet is communicated with the eighth inlet, and the third heat exchange outlet is communicated with the eighth outlet.
In one implementation of the disclosed embodiment, the natural gas dehydration system further includes:
and the first valve is positioned on a pipeline which is communicated with the eighth inlet and the second outlet.
In one implementation of the disclosed embodiment, the natural gas dehydration system further includes:
and the liquid pump is positioned on a pipeline communicated with the eighth outlet and the triethylene glycol lean liquid inlet.
The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:
in the embodiment of the disclosure, a reboiler is used to dehydrate the triethylene glycol rich solution to form a triethylene glycol lean solution after dehydration, the temperature of the triethylene glycol lean solution is high, and the triethylene glycol lean solution flows to the first buffer tank through the first outlet, so that the first accommodating cavity of the first buffer tank is filled with the triethylene glycol lean solution with high temperature. And the triethylene glycol rich solution to be dehydrated enters the first heat exchange inlet through the third inlet and then enters the first heat exchanger, the temperature of the triethylene glycol rich solution entering from the first heat exchange inlet is low, the first heat exchanger is positioned in the first accommodating cavity, and the triethylene glycol rich solution with low temperature in the first heat exchanger exchanges heat with the triethylene glycol poor solution with high temperature filled in the first accommodating cavity, so that the temperature of the triethylene glycol rich solution is increased. The triethylene glycol rich solution with the increased temperature flows to the third outlet through the first heat exchange outlet of the first heat exchanger, the temperature of the triethylene glycol rich solution flowing out of the first heat exchange inlet is higher, and the triethylene glycol rich solution with the higher temperature flows to the first inlet of the reboiler through the third outlet and enters the reboiler for dehydration to form the triethylene glycol lean solution. The triethylene glycol lean solution in the first accommodating cavity is subjected to heat exchange with the triethylene glycol rich solution, so that the temperature is reduced, and the triethylene glycol lean solution is output through the second outlet and is used for dehydrating natural gas. Because first heat transfer entry and first heat transfer export are located the relative both ends of first buffer tank, also the less triethylene glycol rich liquid of temperature and the higher triethylene glycol rich liquid of temperature are located the relative both ends of first buffer tank respectively, the more triethylene glycol rich liquid of temperature need not pass through the low temperature end at first heat transfer entry place, can not make the triethylene glycol rich liquid temperature that flows out from first heat transfer export descend, consequently, the rich liquid temperature of triethylene glycol that gets into in the reboiler is higher, can not make the vapor condensation in the reboiler form liquid water, can not influence dewatering effect.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a triethylene glycol dehydration apparatus provided in an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a natural gas dehydration system provided by an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a triethylene glycol dehydration apparatus provided in an embodiment of the present disclosure. Referring to fig. 1, a triethylene glycol dehydration apparatus 1 includes a reboiler 10, a first buffer tank 20, and a first heat exchanger 30. The reboiler 10 has a first inlet 101 and a first outlet 102. The first buffer tank 20 has a second inlet 201, a second outlet 202, a third inlet 203, a third outlet 204 and a first accommodating chamber 205, the second inlet 201 and the second outlet 202 are respectively communicated with the first accommodating chamber 205, the third inlet 203 and the third outlet 204 are isolated from the first accommodating chamber 205, the second inlet 201 is communicated with the first outlet 102, the second outlet 202 is used for outputting triethylene glycol lean solution, the third inlet 203 is used for inputting triethylene glycol rich solution, and the third outlet 204 is communicated with the first inlet 101. The first heat exchanger 30 is located in the first accommodating cavity 205, the first heat exchanger 30 has a first heat exchange inlet 301 and a first heat exchange outlet 302 which are communicated with each other, the first heat exchange inlet 301 and the first heat exchange outlet 302 are respectively located at two opposite ends of the first buffer tank 20, the first heat exchange inlet 301 is communicated with the third inlet 203, and the first heat exchange outlet 302 is communicated with the third outlet 204.
In the embodiment of the disclosure, a reboiler is used to dehydrate the triethylene glycol rich solution to form a triethylene glycol lean solution after dehydration, the temperature of the triethylene glycol lean solution is high, and the triethylene glycol lean solution flows to the first buffer tank through the first outlet, so that the first accommodating cavity of the first buffer tank is filled with the triethylene glycol lean solution with high temperature. And the triethylene glycol rich solution to be dehydrated enters the first heat exchange inlet through the third inlet and then enters the first heat exchanger, the temperature of the triethylene glycol rich solution entering from the first heat exchange inlet is low, the first heat exchanger is positioned in the first accommodating cavity, and the triethylene glycol rich solution with low temperature in the first heat exchanger exchanges heat with the triethylene glycol poor solution with high temperature filled in the first accommodating cavity, so that the temperature of the triethylene glycol rich solution is increased. The triethylene glycol rich solution with the increased temperature flows to the third outlet through the first heat exchange outlet of the first heat exchanger, the temperature of the triethylene glycol rich solution flowing out of the first heat exchange inlet is higher, and the triethylene glycol rich solution with the higher temperature flows to the first inlet of the reboiler through the third outlet and enters the reboiler for dehydration to form the triethylene glycol lean solution. The temperature of the triethylene glycol lean solution in the first accommodating cavity is reduced due to heat exchange with the triethylene glycol rich solution, and the triethylene glycol lean solution is output through the second outlet and used for dehydrating natural gas. Because first heat transfer entry and first heat transfer export are located the relative both ends of first buffer tank, also the less triethylene glycol rich liquid of temperature and the higher triethylene glycol rich liquid of temperature are located the relative both ends of first buffer tank respectively, the more triethylene glycol rich liquid of temperature need not pass through the low temperature end at first heat transfer entry place, can not make the triethylene glycol rich liquid temperature that flows out from first heat transfer export descend, consequently, the rich liquid temperature of triethylene glycol that gets into in the reboiler is higher, can not make the vapor condensation in the reboiler form liquid water, can not influence dewatering effect.
In the disclosed embodiment, the third inlet 203 and the third outlet 204 are isolated from the first receiving chamber 205, which means that the third inlet 203 and the third outlet 204 are not communicated with the first receiving chamber 205.
Water is an inevitable impurity in natural gas exploitation, and the natural gas containing water can cause insufficient combustion of the natural gas and waste resources; at the same time, the free water in the natural gas will be in contact with the entrained sulfur dioxide (H) in the natural gas2S) and carbon dioxide (CO)2) Forming acidic substances, corroding pipelines and equipment; water in the natural gas can be combined with small molecules in the natural gas to form natural gas hydrate, and the hydrate can cause pipeline blockage in a pipeline, so that the gas transmission quantity of the natural gas is low, the pressure of the pipeline is increased, and the pipeline is easy to damage. It is particularly important to dehydrate natural gas.
In the skyFour glycols have been successfully used in the gas dehydration industry, ethylene glycol, diethylene glycol, triethylene glycol and tetraethylene glycol. The regeneration process of the triethylene glycol is simple, the mass fraction of the triethylene glycol lean solution is high and can reach 98-99%, and the triethylene glycol with the same mass can absorb more water. Triethylene glycol also known as triethylene glycol, having a molecular formula C6H14O4The triethylene glycol contains hydroxyl and ether bonds, can form hydrogen bonds with water, has strong affinity to water, and has high dehydration depth (dehydration degree). Therefore, the triethylene glycol is widely applied to dehydration of natural gas.
In the related art, the first heat exchange inlet 301 and the first heat exchange outlet 302 of the first heat exchanger 30 are both located at the same end of the first buffer tank 20. Since the first heat exchange inlet 301 is communicated with the triethylene glycol rich liquid to be dehydrated, the temperature of the triethylene glycol rich liquid to be dehydrated is low, so that the temperature of the first buffer tank 20 at the end is low, and a low-temperature end is formed. When the triethylene glycol rich solution with higher temperature is formed by heat exchange with the triethylene glycol rich solution, the triethylene glycol rich solution with higher temperature needs to pass through the low-temperature end, so that the temperature of the original triethylene glycol rich solution with higher temperature is reduced. In the related art, the temperature of the triethylene glycol rich solution output from the first heat exchange outlet 302 is about 95 degrees centigrade (deg.c), which is lower than the boiling point of water, and when the triethylene glycol rich solution enters the reboiler 10 through the first inlet 101, the triethylene glycol rich solution meets the water vapor in the reboiler 10, so that the water vapor is condensed into liquid water, and the dehydration effect is affected. At the same time, liquid water may form a liquid seal in the reboiler 10, increasing the pressure in the reboiler 10, causing a safety hazard.
In the disclosed embodiment, the second inlet 201 and the first outlet 102 may communicate through the duct 100.
In the embodiment of the present disclosure, the first heat exchange inlet 301 and the first heat exchange outlet 302 are respectively located at two opposite ends of the first buffer tank 20, the end where the first heat exchange inlet 301 is located is a low temperature end, and the end where the first heat exchange outlet 302 is located is a high temperature end, when heat exchange is performed with the triethylene glycol rich liquid to form the triethylene glycol rich liquid with a higher temperature, the triethylene glycol rich liquid with a higher temperature does not need to pass through the low temperature end, and the temperature of the triethylene glycol rich liquid is not reduced. When the rich triethylene glycol solution enters the reboiler 10 through the first inlet 101, the temperature is higher than the boiling point of the water vapor, and even if the rich triethylene glycol solution meets the water vapor in the reboiler 10, the water vapor is not condensed into liquid water, and the dehydration effect is not affected. The triethylene glycol dehydration device provided by the embodiment of the disclosure enables the temperature of the triethylene glycol rich solution to be dehydrated to be 105-110 ℃ when entering the reboiler 10 through the first inlet 101, and the temperature is higher than the boiling point of water vapor, so that the dehydration effect is not affected. Meanwhile, the water vapor can not be condensed into liquid water, so that a liquid seal is prevented from being formed in the reboiler 10, and the accident rate is reduced.
In the embodiment of the present disclosure, the reboiler 10 is a heater, the rich triethylene glycol solution is heated in the reboiler 10, hydrogen bonds formed by triethylene glycol and water are broken, so that moisture in the rich triethylene glycol solution is separated from triethylene glycol, dehydration of triethylene glycol is realized, and water forms water vapor under a high temperature condition and is dispersed into the air from the top end of the reboiler 10.
In the disclosed embodiment, the hydrogen bond formed by triethylene glycol and water is broken at a temperature higher than 180 degrees celsius, and triethylene glycol is decomposed at a temperature higher than 206.7 degrees celsius. The reboiler 10 in the embodiments of the present disclosure provides a temperature between 180 degrees celsius and 206.7 degrees celsius, i.e., the temperature of the water vapor evaporating from the reboiler 10 is above 108 degrees celsius.
Illustratively, the temperature provided by reboiler 10 may be measured by a thermometer, which may have an error, typically identified as a 10% error. Thus, the temperature provided by the reboiler 10 in embodiments of the present disclosure may be 198 degrees celsius.
As shown in fig. 1, the reboiler 10 includes an igniter 103 and a stack 104, and the igniter 103 ignites the fuel in the reboiler 10 to provide heat to the reboiler 10, thereby achieving heating of the dotriacontal. The stack 104 discharges the tail gas formed by the combustion of the fuel.
As shown in fig. 1, the reboiler 10 is located above the first buffer tank 20 in the vertical direction. The first outlet 102 is located at the bottom end of the reboiler 10 and the second inlet 201 is located at the top end of the first buffer tank 20.
During the heating of the reboiler 10, the evaporated water vapor is dispersed into the air from the top of the reboiler 10 and triethylene glycol is deposited at the bottom of the reboiler 10. The first outlet 102 is arranged at the bottom end of the reboiler 10 and is communicated with the second inlet 201 at the top end of the first buffer tank 20, and the triethylene glycol flows into the first buffer tank 20 under the action of self gravity, so that other power devices are not needed to convey the triethylene glycol in the reboiler 10 to the first buffer tank 20, and the operation is more convenient.
Fig. 2 is a schematic structural diagram of a natural gas dehydration system provided by an embodiment of the present disclosure. Referring to fig. 2, the triethylene glycol dehydration apparatus 1 further includes: a rectification column 40 and a preheater 50. The rectification column 40 is provided with a fourth inlet 401, a fourth outlet 402, a fifth inlet 403, a fifth outlet 404 and a second containing cavity 405, the fourth inlet 401 and the fourth outlet 402 are respectively communicated with the second containing cavity 405, the fifth inlet 403 and the fifth outlet 404 are isolated from the second containing cavity 405, the fourth inlet 401 is communicated with the third outlet 204, the fourth outlet 402 is communicated with the first inlet 101, the fifth inlet 403 is used for inputting triethylene glycol rich liquid to be dehydrated, and the fifth outlet 404 is communicated with the third inlet 203. The preheater 50 is located in the second accommodating chamber 405, the preheater 50 has a preheating inlet 501 and a preheating outlet 502 which are communicated with each other, the preheating inlet 501 is communicated with the fifth inlet 403, and the preheating outlet 502 is communicated with the fifth outlet 404.
The fourth outlet 402 of the rectifying column 40 communicates with the top end of the reboiler 10, triethylene glycol is heated in the reboiler 10, moisture in the triethylene glycol is heated to form water vapor, and the water vapor is discharged through the rectifying column 40. The water vapor also carries a certain amount of triethylene glycol, and the triethylene glycol carried in the water vapor needs to be separated out, so that the resource waste is avoided. The rectification column 40 is provided with a bubble cap, the bubble cap is provided with a plurality of small holes, when the water vapor carrying the triethylene glycol passes through the small holes on the bubble cap, the triethylene glycol with larger volume can be intercepted by the small holes and adsorbed on the bubble cap, and as the deposited amount of the triethylene glycol increases, the triethylene glycol can fall off the bubble cap and be deposited at the bottom end of the rectification column 40 and flows to the reboiler 10 from the fourth outlet 402 to form a triethylene glycol lean solution. The water vapor will pass through the small holes and be discharged to the air. Triethylene glycol is recovered through the rectifying column 40, so that resources are saved. Wherein the fourth inlet 401 is located below the blister.
In the disclosed embodiment, the temperature of the water vapor is higher and is discharged from the top end of the rectification column 40 into the air, that is, the temperature in the rectification column 40 is higher. The preheater 50 is disposed in the second accommodating chamber 405 of the rectifying column 40, the fifth inlet 403 is used for inputting the triethylene glycol rich solution to be dehydrated, the triethylene glycol rich solution to be dehydrated enters the preheating inlet 501 through the fifth inlet 403 and enters the preheater 50 through the preheating inlet 501, and the triethylene glycol rich solution exchanges heat with water vapor in the preheater 50 to increase the temperature of the triethylene glycol rich solution. The triethylene glycol rich liquid with the increased temperature enters the fifth outlet 404 through the preheating outlet 502, enters the third inlet 203 through the fifth outlet, and enters the first heat exchanger 30 through the first heat exchange inlet 301. Since the temperature of the rich triethylene glycol solution has increased by a small difference from the temperature of the lean triethylene glycol solution in the first buffer tank 20, the temperature in the first accommodation chamber 205 is increased, and the temperature of the rich triethylene glycol solution can be increased during the heat exchange between the rich triethylene glycol solution and the lean triethylene glycol solution.
Meanwhile, the fourth inlet 401 is communicated with the third outlet 204, the triethylene glycol rich liquid subjected to heat exchange by the first heat exchanger 30 enters the fourth inlet 401 through the third outlet 204 and exchanges heat with the water vapor in the rectification column 40 again, the fourth inlet 401 is communicated with the fourth outlet 402, the fourth outlet 402 is communicated with the first inlet, and the temperature of the triethylene glycol rich liquid entering the reboiler 10 is further increased.
In the disclosed embodiment, the fourth inlet 401 communicates with the third outlet 204 through the conduit 100.
In the embodiment of the disclosure, triethylene glycol also adsorbs hydrogen sulfide and carbon dioxide in natural gas during dehydration of natural gas by using triethylene glycol. During the dehydration of triethylene glycol, hydrogen sulfide and carbon dioxide are also removed. Therefore, not only water vapor but also gases such as hydrogen sulfide and carbon dioxide are discharged from the top of the rectifying column 40, and these gases are collectively referred to as off gas. The tail gas at the top of the rectification column 40 may provide heat to the rich triethylene glycol solution in the preheater 50.
Referring again to fig. 2, the triethylene glycol dehydration apparatus 1 further includes: a second buffer tank 60 and a second heat exchanger 70.
The second buffer tank 60 has a sixth inlet 601, a sixth outlet 602, a seventh inlet 603, a seventh outlet 604, and a third accommodating chamber 605, the sixth inlet 601 and the sixth outlet 602 are respectively communicated with the third accommodating chamber 605, the seventh inlet 603 and the seventh outlet 604 are isolated from the third accommodating chamber 605, the sixth inlet 601 is communicated with the second outlet 202, the sixth outlet 602 is used for outputting triethylene glycol lean solution, the seventh inlet 603 is communicated with the fifth outlet 404, and the seventh outlet 604 is communicated with the third inlet 203. The second heat exchanger 70 is located in the third accommodating chamber 605, the second heat exchanger 70 has a second heat exchange inlet 701 and a second heat exchange outlet 702 which are communicated with each other, the second heat exchange inlet 701 is communicated with the seventh inlet 603, and the second heat exchange outlet 702 is communicated with the third inlet 203.
The second buffer tank 60 and the second heat exchanger 70 are arranged in the triethylene glycol dehydration apparatus 1, the sixth inlet 601 of the second buffer tank 60 is communicated with the second outlet 202 of the first buffer tank, the triethylene glycol lean solution in the first buffer tank 20 flows to the second buffer tank 60, that is, the third accommodation chamber 605 of the second buffer tank 60 is also filled with the triethylene glycol lean solution with higher temperature. The seventh inlet 603 is communicated with the fifth outlet 404, that is, the triethylene glycol rich solution after heat exchange by the preheater 50 flows to the seventh inlet 603 through the fifth outlet 404. And flows to the second heat exchange inlet 701 through the seventh inlet 603, the second heat exchanger 70 is located in the third accommodating chamber 605, and the triethylene glycol rich solution in the second heat exchanger 70 exchanges heat with the triethylene glycol lean solution with higher temperature in the third accommodating chamber 605. The temperature of the triethylene glycol rich liquid is increased again after passing through the second heat exchanger 70. The triethylene glycol rich liquid flows to the seventh outlet 604 through the second heat exchange outlet 702, then flows to the first heat exchange inlet 301 through the seventh outlet 604, and then flows into the first heat exchanger 30, at this time, the temperature of the triethylene glycol rich liquid is increased, the difference between the temperature of the triethylene glycol rich liquid and the temperature of the triethylene glycol lean liquid in the first accommodating cavity 205 is smaller, the temperature in the first accommodating cavity 205 is increased, and in the process of heat exchange between the triethylene glycol rich liquid and the triethylene glycol lean liquid, the temperature of the triethylene glycol rich liquid can be increased, and the temperature of the triethylene glycol lean liquid is reduced.
In the disclosed embodiment, the sixth inlet 601 communicates with the second outlet 202 through the conduit 100. The seventh inlet 603 communicates with the fifth outlet 404 via the conduit 100. The triethylene glycol lean solution is discharged through a sixth outlet 602 (i.e., the triethylene glycol lean solution outlet of the entire triethylene glycol dehydration unit).
In the embodiment of the present disclosure, after the triethylene glycol rich solution is subjected to heat exchange by the second buffer tank 60 and the second heat exchanger 70, the temperature of the triethylene glycol rich solution entering the first heat exchanger 30 is already increased, and the temperature difference between the triethylene glycol rich solution and the triethylene glycol lean solution in the first buffer tank 20 is reduced, so that no obvious temperature difference is formed. That is, the temperature difference between the low temperature side and the high temperature side in the second buffer tank 60 is small, so that the temperature of the triethylene glycol rich liquid entering the reboiler 10 is ensured to be high.
In the embodiment of the present disclosure, the first heat exchanger 30, the preheater 50, and the second heat exchanger 70 are all curved pipes, so as to increase the contact area between the first heat exchanger 30, the preheater 50, and the second heat exchanger 70 and the triethylene glycol lean solution, that is, to increase the heat exchange effect between the triethylene glycol rich solution and the triethylene glycol lean solution.
Illustratively, the first heat exchanger 30, the preheater 50, and the second heat exchanger 70 are helical tubes, U-shaped tubes, or serpentine tubes. The spiral pipeline, the U-shaped pipeline or the snake-shaped pipeline has large surface area, and the heat exchange effect of the triethylene glycol rich solution and the triethylene glycol poor solution can be improved.
In the embodiment of the present disclosure, the shapes of the first heat exchanger 30, the preheater 50 and the second heat exchanger 70 may be the same or different, and the present disclosure does not limit this.
Referring again to fig. 2, the triethylene glycol dehydration apparatus 1 further includes: a flash tank 80. The flash tank 80 has a flash inlet 801 and a flash outlet 802, the flash inlet 801 communicating with the seventh outlet 604 and the flash outlet 802 communicating with the third inlet 203.
The triethylene glycol rich liquid enters a flash inlet 801 through a seventh outlet 604, then enters the flash tank 80, is subjected to primary dehydration in the flash tank 80, then flows into a third inlet 203 through a flash outlet 802, and then enters the reboiler 10 for secondary dehydration after heat exchange through the first heat exchanger 30. The triethylene glycol is dehydrated for the first time in the flash tank 80 and for the second time in the reboiler 10, i.e., twice in the triethylene glycol dehydration unit 1. The triethylene glycol is dehydrated twice, so that the saying effect is ensured.
As shown in fig. 2, the flash inlet 801 is communicated with the seventh outlet 604, and the triethylene glycol rich liquid enters the flash tank 80 after being subjected to heat exchange through the preheater 50 and the second heat exchanger 70, and the temperature of the triethylene glycol rich liquid is increased. The pressure in the flash tank 80 is lower since the boiling point of the material is higher with increasing pressure and lower with decreasing pressure. The pressure in the flash tank 80 is reduced, the boiling point of water in the flash tank 80 is reduced, and after the triethylene glycol rich liquid containing moisture enters the flash tank 80, the moisture in the triethylene glycol rich liquid can be evaporated due to the lower pressure and the higher temperature of the triethylene glycol rich liquid, so that the triethylene glycol is dehydrated for the first time.
In the disclosed embodiment, the flash outlet 802 communicates with the third inlet 203 through conduit 100. The flash inlet 801 communicates with the seventh outlet 604 via conduit 100.
The embodiment of the present disclosure also provides a natural gas dehydration system, referring to fig. 2, the natural gas dehydration system includes a triethylene glycol dehydration device 1 and an absorption tower 2, and the absorption tower 2 has a triethylene glycol rich liquid outlet 21 and a triethylene glycol lean liquid inlet 22.
The third inlet 203 is communicated with the triethylene glycol rich liquid outlet 21 of the absorption tower 2, and the second outlet 202 is communicated with the triethylene glycol lean liquid inlet 22 of the absorption tower 2.
In the natural gas dehydration system provided by the embodiment of the present disclosure, the triethylene glycol rich solution that has absorbed moisture in the absorption tower 2 is discharged through the triethylene glycol rich solution outlet 21, and enters the triethylene glycol dehydration apparatus 1 through the third inlet 203 for dehydration, so as to form the triethylene glycol lean solution, and the triethylene glycol lean solution enters the triethylene glycol lean solution inlet 22 of the absorption tower 2 through the second outlet 202, and enters the absorption tower 2 for dehydration. Namely, the natural gas dehydration system forms a circulating system to recycle the triethylene glycol, thereby saving resources.
Referring again to fig. 2, the natural gas dehydration system further comprises: a third buffer tank 3 and a third heat exchanger 4. The third buffer tank 3 has an eighth inlet 31, an eighth outlet 32, and a fourth accommodating chamber 33, the eighth inlet 31 communicating with the second outlet 202, and the eighth outlet 32 communicating with the triethylene glycol lean liquid inlet 22. The third heat exchanger 4 is positioned in the fourth accommodating cavity 33, the third heat exchanger 4 is provided with a third heat exchange inlet 41 and a third heat exchange outlet 42 which are communicated with each other, the third heat exchange inlet 41 is communicated with the eighth inlet 31, and the third heat exchange outlet 42 is communicated with the eighth outlet 32.
Wherein the eighth inlet 31 communicates with the second outlet 202 through the second buffer tank 60, i.e. the eighth inlet 31 communicates with the sixth outlet 602.
Although the temperature of the triethylene glycol barren solution discharged from the triethylene glycol dehydration device 1 is reduced after heat exchange, the temperature of the triethylene glycol barren solution is still relatively high for the absorption tower 2, and the triethylene glycol barren solution can be input into the absorption tower 2 after being cooled, so that the absorption tower 2 is prevented from being damaged due to too high temperature.
The second buffer tank 60 stores triethylene glycol lean solution, the triethylene glycol lean solution flows to the eighth inlet 31 through the second outlet 202 in the second buffer tank and flows to the third heat exchange inlet 41 through the eighth inlet 31, the fourth accommodating chamber 33 contains cold water with low temperature which flows circularly, the third heat exchanger 4 is positioned in the fourth accommodating chamber 33, the triethylene glycol lean solution exchanges heat with the cold water in the third heat exchanger 4, the temperature of the triethylene glycol lean solution is reduced, the triethylene glycol lean solution flows to the eighth outlet 32 through the third heat exchange outlet 42, and then the triethylene glycol lean solution flows to the absorption tower 2 through the eighth outlet 32. The triethylene glycol barren solution is contacted with the natural gas in the absorption tower 2 again to dehydrate the natural gas, so that the triethylene glycol solution is recycled, and resources are saved.
In the disclosed embodiment, the eighth inlet 31 communicates with the sixth outlet 602 through the conduit 100. The eighth outlet 32 communicates with the triethylene glycol lean solution inlet 22 through a pipe 100.
As shown in fig. 2, the conduit 100 communicating the flash inlet 801 and the seventh outlet 604 intersects, but does not communicate with, the conduit 100 communicating the eighth inlet 31 and with the sixth outlet 602.
In the embodiment of the present disclosure, the third heat exchanger 4 is a curved pipe, which increases the contact area between the third heat exchanger 4 and the triethylene glycol lean solution and the cold water, that is, increases the heat exchange effect between the cold water and the triethylene glycol lean solution.
Illustratively, the third heat exchanger 4 is a helical tube, a U-shaped tube, or a serpentine tube. The spiral pipeline, the U-shaped pipeline or the snake-shaped pipeline has large surface area, and the heat exchange effect of cold water and triethylene glycol barren solution can be improved.
In the embodiment of the present disclosure, the third heat exchanger 4 may be the same as or different from the first heat exchanger 30, the preheater 50, and the second heat exchanger 70, and the present disclosure does not limit this.
In the embodiment of the present disclosure, the third heat exchanger 4 is cooled by a water bath, and the third heat exchanger 4 may be referred to as a water bath heat exchanger.
Referring again to fig. 2, the natural gas dehydration system further comprises: a first valve 5. The first valve 5 is located on the conduit 100 communicating the eighth inlet 31 and the second outlet 202.
The first valve 5 is disposed on the pipe 100 communicating the eighth inlet 31 and the second outlet 202, and the flow of the triethylene glycol lean solution can be controlled by the first valve 5, which is more convenient. In normal operation, the first valve 5 is opened to allow the triethylene glycol lean solution to flow into the absorption tower 2. When the triethylene glycol dehydration device is damaged, the first valve 5 can be closed, so that triethylene glycol barren solution does not flow any more, and the overhaul is convenient.
Referring again to fig. 2, the natural gas dehydration system further comprises: a liquid pump 6. The liquid pump 6 is located on a pipe that communicates the eighth outlet 32 and the triethylene glycol lean liquid inlet 22.
The triethylene glycol lean solution enters the absorption tower 2 generally from the upper part of the absorption tower 2, that is, the triethylene glycol lean solution inlet 22 is positioned at the upper part of the absorption tower 2. When the triethylene glycol lean solution flows from the upper part of the absorption tower 2 to the lower part of the absorption tower 2, the triethylene glycol lean solution is in contact with the natural gas in the absorption tower 2 to adsorb moisture in the natural gas, and the dehydration effect of the natural gas is ensured. The pipeline communicating the eighth outlet 32 and the triethylene glycol lean solution inlet 22 is provided with the liquid pump 6, and kinetic energy is provided for the triethylene glycol lean solution through the liquid pump 6, so that the triethylene glycol lean solution can enter the absorption tower 2 from the upper part of the absorption tower 2.
Referring again to fig. 2, the fifth inlet 403 communicates with the triethylene glycol rich liquid outlet 21 of the absorption column 2.
In the disclosed embodiment, the fifth inlet 403 is in communication with the triethylene glycol rich liquid outlet 21 through a conduit 100.
The triethylene glycol lean solution is contacted with the natural gas in the absorption tower 2, and water in the natural gas is absorbed to form a triethylene glycol rich solution. The triethylene glycol rich solution in the absorption tower 2 is directly sent to the fifth inlet 403 through the triethylene glycol rich solution outlet 21, that is, the triethylene glycol is recycled, and resources are saved.
Referring again to fig. 2, the triethylene glycol dehydration apparatus further comprises: a second valve 7. The second valve 7 is located on the conduit connecting the fifth inlet 403 and the rich triethylene glycol liquid outlet 21.
The second valve 7 is arranged on a pipeline communicating the fifth inlet 403 and the triethylene glycol rich liquid outlet 21, and the flow of the triethylene glycol rich liquid can be controlled through the second valve 7, so that the operation is more convenient. In normal operation, the second valve 7 is opened to allow the rich triethylene glycol solution to flow into the triethylene glycol dehydration unit. When the triethylene glycol dehydration device is damaged or the absorption tower is damaged, the second valve 7 can be closed, the triethylene glycol rich liquid is not conveyed into the triethylene glycol dehydration device any more, and the overhaul is convenient.
Arrows in fig. 2 represent the flowing direction of triethylene glycol, the triethylene glycol lean solution in the absorption tower 2 absorbs moisture to form triethylene glycol rich solution, and the triethylene glycol rich solution flows from the triethylene glycol rich solution outlet 21 to the fifth inlet 403, then flows to the preheating inlet 501, and flows into the preheater 50, and exchanges heat with the water vapor in the rectification column 40 in the preheater 50 to realize preheating; the triethylene glycol rich solution flows from the preheating outlet 502 to the fifth outlet 404, then flows to the seventh inlet 603, flows to the second heat exchange inlet 701, flows into the second heat exchanger 70, exchanges heat with the triethylene glycol lean solution in the second buffer tank 60 in the second heat exchanger 70, and is heated again; the triethylene glycol rich solution flows into a seventh outlet 604 from the second heat exchange outlet 702, then flows to a flash evaporation inlet 801, and is subjected to primary dehydration in the flash evaporation tank 80; the triethylene glycol rich solution flows from the flash evaporation outlet 802 to the third inlet 203, then flows to the first heat exchange inlet 301, flows into the first heat exchanger 30, exchanges heat with the triethylene glycol lean solution in the first buffer tank 20 in the first heat exchanger 30, and is heated again; the heated triethylene glycol rich solution flows from the first heat exchange outlet 302 to the third outlet 204, flows to the fourth inlet 401 through the third outlet 204, then flows to the first inlet 101 through the fourth outlet 402, and enters the reboiler 10 for secondary dehydration to form a triethylene glycol lean solution. The triethylene glycol lean solution flows from the first outlet 102 to the second inlet 201, enters the first buffer tank 20, flows to the sixth inlet 601 through the second outlet after heat exchange, enters the second buffer tank 60 for heat exchange, then flows to the eighth inlet 31 through the sixth outlet 602 (namely, the triethylene glycol lean solution outlet of the whole triethylene glycol dehydration device), then flows to the third heat exchange inlet 41, exchanges heat with cold water in the third buffer tank 3 in the third heat exchanger 4 for cooling, flows to the eighth outlet 32 through the third heat exchange outlet 42, inputs the triethylene glycol lean solution into the triethylene glycol lean solution inlet 22 through the liquid pump 6, enters the absorption tower 2 again, contacts with natural gas in the absorption tower 2, and absorbs moisture in the natural gas. Namely, the triethylene glycol is recycled, so that resources are saved.
According to the natural gas dehydration system, high-temperature triethylene glycol lean solution and low-temperature triethylene glycol rich solution are subjected to sufficient heat exchange, the triethylene glycol rich solution after heat exchange can reach 107 ℃, and water vapor generated by rectification of the reboiler cannot be condensed into liquid water after entering the rectification column, so that liquid seal cannot be generated, potential safety hazards caused by liquid seal are eliminated, refractory materials of the burning furnace are protected, and maintenance cost of the burning furnace is saved.
The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.
Claims (10)
1. A triethylene glycol dehydration apparatus, characterized in that the triethylene glycol dehydration apparatus (1) comprises:
a reboiler (10) having a first inlet (101) and a first outlet (102);
a first buffer tank (20) having a second inlet (201), a second outlet (202), a third inlet (203), a third outlet (204) and a first accommodating chamber (205), wherein the second inlet (201) and the second outlet (202) are respectively communicated with the first accommodating chamber (205), the third inlet (203) and the third outlet (204) are isolated from the first accommodating chamber (205), the second inlet (201) is communicated with the first outlet (102), the second outlet (202) is used for outputting triethylene glycol lean liquid, the third inlet (203) is used for inputting triethylene glycol rich liquid, and the third outlet (204) is communicated with the first inlet (101);
a first heat exchanger (30) located in the first accommodating cavity (205), the first heat exchanger (30) having a first heat exchange inlet (301) and a first heat exchange outlet (302) communicated with each other, the first heat exchange inlet (301) and the first heat exchange outlet (302) being respectively located at two opposite ends of the first buffer tank (20), the first heat exchange inlet (301) being communicated with the third inlet (203), and the first heat exchange outlet (302) being communicated with the third outlet (204).
2. Triethylene glycol dehydration unit according to claim 1 characterized in that in vertical direction said reboiler (10) is located above said first buffer tank (20);
the first outlet (102) is located at the bottom end of the reboiler (10) and the second inlet (201) is located at the top end of the first buffer tank (20).
3. The triethylene glycol dehydration apparatus according to claim 1, characterized in that the triethylene glycol dehydration apparatus (1) further comprises:
a rectification column (40) having a fourth inlet (401), a fourth outlet (402), a fifth inlet (403), a fifth outlet (404) and a second containing cavity (405), wherein the fourth inlet (401) and the fourth outlet (402) are respectively communicated with the second containing cavity (405), the fifth inlet (403) and the fifth outlet (404) are isolated from the second containing cavity (405), the fourth inlet (401) is communicated with the third outlet (204), the fourth outlet (402) is communicated with the first inlet (101), the fifth inlet (403) is used for inputting triethylene glycol rich liquid to be dehydrated, and the fifth outlet (404) is communicated with the third inlet (203);
a preheater (50) located in the second accommodating chamber (405), the preheater (50) having a preheating inlet (501) and a preheating outlet (502) which are communicated with each other, the preheating inlet (501) being communicated with the fifth inlet (403), and the preheating outlet (502) being communicated with the fifth outlet (404).
4. The triethylene glycol dehydration apparatus according to claim 3, characterized in that the triethylene glycol dehydration apparatus (1) further comprises:
a second buffer tank (60) having a sixth inlet (601), a sixth outlet (602), a seventh inlet (603), a seventh outlet (604) and a third accommodating chamber (605), wherein the sixth inlet (601) and the sixth outlet (602) are respectively communicated with the third accommodating chamber (605), the seventh inlet (603) and the seventh outlet (604) are isolated from the third accommodating chamber (605), the sixth inlet (601) is communicated with the second outlet (202), the sixth outlet (602) is used for outputting triethylene glycol lean solution, the seventh inlet (603) is communicated with the fifth outlet (404), and the seventh outlet (604) is communicated with the third inlet (203);
a second heat exchanger (70) located in the third receiving cavity (605), the second heat exchanger (70) having a second heat exchange inlet (701) and a second heat exchange outlet (702) in communication with each other, the second heat exchange inlet (701) being in communication with the seventh inlet (603), the second heat exchange outlet (702) being in communication with the third inlet (203).
5. The triethylene glycol dehydration apparatus according to claim 4, characterized in that the triethylene glycol dehydration apparatus (1) further comprises:
a flash tank (80) having a flash inlet (801) and a flash outlet (802), the flash inlet (801) being in communication with the seventh outlet (604), the flash outlet (802) being in communication with the third inlet (203).
6. A natural gas dehydration system characterized by comprising the triethylene glycol dehydration apparatus (1) according to any one of claims 1 to 5 and an absorption tower (2).
7. The natural gas dehydration system according to claim 6, characterized in that the absorption tower (2) has a triethylene glycol rich liquid outlet (21) and a triethylene glycol lean liquid inlet (22), the third inlet (203) communicates with the triethylene glycol rich liquid outlet (21), and the second outlet (202) communicates with the triethylene glycol lean liquid inlet (22).
8. The natural gas dehydration system of claim 7 further comprising:
a third buffer tank (3) having an eighth inlet (31), an eighth outlet (32) and a fourth accommodation chamber (33), the eighth inlet (31) communicating with the second outlet (202), the eighth outlet (32) communicating with the triethylene glycol lean liquid inlet (22);
a third heat exchanger (4) located in the fourth accommodating chamber (33), the third heat exchanger (4) having a third heat exchange inlet (41) and a third heat exchange outlet (42) communicated with each other, the third heat exchange inlet (41) being communicated with the eighth inlet (31), the third heat exchange outlet (42) being communicated with the eighth outlet (32).
9. The natural gas dehydration system of claim 8 further comprising:
a first valve (5) located on the conduit connecting the eighth inlet (31) and the second outlet (202).
10. The natural gas dehydration system of claim 8 further comprising:
and the liquid pump (6) is positioned on a pipeline communicated with the eighth outlet (32) and the triethylene glycol lean liquid inlet (22).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010910570.XA CN114191836A (en) | 2020-09-02 | 2020-09-02 | Triethylene glycol dewatering device and natural gas dewatering system |
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| CN202010910570.XA CN114191836A (en) | 2020-09-02 | 2020-09-02 | Triethylene glycol dewatering device and natural gas dewatering system |
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| CN117643744A (en) * | 2024-01-30 | 2024-03-05 | 四川凌耘建科技有限公司 | Efficient dehydration method and related device for natural gas triethylene glycol |
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Application publication date: 20220318 |