Triethylene glycol regenerated condensate purification treatment system

Abstract

The utility model discloses a triethylene glycol regenerated condensate purification treatment system which comprises a gas-liquid separator, a reaction tank and a filter which are sequentially connected along the flowing direction of a triethylene glycol solution, the gas-liquid separator is used for carrying out gas-liquid separation on the triethylene glycol regenerated condensate, and the separated triethylene glycol solution can be introduced into the reaction tank; the reaction tank is also connected with a purifying agent storage tank for storing and supplying a purifying agent; the filter is used for filtering solid impurity particles in the triethylene glycol solution; the gas outlet of the reaction tank is also provided with a gas purifier. The triethylene glycol regenerated condensate purification treatment system disclosed by the utility model can be used for carrying out purification treatment on reboiled triethylene glycol condensate so as to remove acidic substances, solid impurities and the like mixed in triethylene glycol.

Description

Technical Field

[0001] This utility model relates to the technical field of triethylene glycol regenerated condensate treatment device, and particularly to a triethylene glycol regenerated condensate purification treatment system. Background Technology

[0002] Natural gas extracted from geological formations has a certain level of moisture. If it is not dehydrated, the following problems will occur: During the transportation of natural gas through pipelines, moisture continuously precipitates out. This precipitated moisture combines with acidic gases such as hydrogen sulfide and carbon dioxide in the gas, corroding the pipelines. Furthermore, when the temperature inside the pipeline falls below the freezing point of water, the water in the natural gas will freeze, potentially causing blockages. Therefore, dehydration treatment is necessary before transporting and distributing natural gas.

[0003] Triethylene glycol (TED) is a colorless and transparent liquid with strong water-miscibility and hygroscopic properties. Therefore, TED is widely used in natural gas dehydration processes. In traditional TED dehydration processes, wet natural gas comes into contact with TED in a dehydration tower, where the water in the wet natural gas is absorbed by the TED (lean TED). The dehydrated dry gas enters the pipeline, while the aqueous TED (rich TED) enters a reboiler for regeneration through heating, reboiling, and stripping. Finally, the regenerated TED is returned to the dehydration tower for recycling.

[0004] However, various contaminants carried in natural gas, such as condensate oil, corrosion products like hydrogen sulfide, mechanical impurities, and inorganic salts, may come into contact with and contaminate triethylene glycol during the dehydration process. The triethylene glycol condensate formed after reboiling and stripping regeneration still contains contaminants.

[0005] Therefore, the present invention aims to provide a triethylene glycol regenerated condensate purification system for purifying triethylene glycol condensate after reboiling. Utility Model Content

[0006] This invention provides a triethylene glycol regenerated condensate purification system for purifying triethylene glycol condensate after reboiling, in order to remove acidic substances and solid impurities mixed in triethylene glycol.

[0007] This invention provides a triethylene glycol regenerated condensate purification system, which includes a gas-liquid separator, a reaction tank, and a filter connected sequentially along the flow direction of the triethylene glycol solution.

[0008] The gas-liquid separator is used to separate the gas and liquid in the triethylene glycol regenerated condensate, and the separated triethylene glycol solution can be introduced into the reaction tank.

[0009] The reaction vessel is also connected to a purification agent storage tank for storing and supplying purification agents.

[0010] The filter is used to filter solid impurity particles from the triethylene glycol solution;

[0011] The gas outlet of the reaction vessel is also equipped with a gas purifier.

[0012] In one embodiment, the gas purifier has several airflow channels, and activated carbon is disposed in the airflow channels.

[0013] In one embodiment, the gas purifier includes several airflow pipes, the airflow channel is defined by the inner wall of the airflow pipes, and the several airflow pipes are spliced ​​together side by side to form a honeycomb structure.

[0014] In one embodiment, the cross-section of each of the airflow pipes is a regular polygon.

[0015] In one embodiment, the gas outlet of the reaction vessel is located at the top of the reaction vessel.

[0016] In one embodiment, a hydraulic element is provided downstream of the filter for hydraulically conveying the solution in the reaction vessel to the filter and equipment or pipelines located downstream of the filter.

[0017] As one implementation method, it also includes:

[0018] A level gauge is used to measure the liquid level inside the reaction vessel.

[0019] In one embodiment, the hydraulic component is a hydraulic pump;

[0020] Both the hydraulic pump and the level gauge are electrically connected to the controller, which is configured to control the start and stop of the hydraulic pump based on the level value measured by the level gauge.

[0021] When the measured liquid level is higher than the highest preset threshold, the controller controls the hydraulic pump to start; when the measured liquid level is lower than the lowest preset threshold, the controller controls the hydraulic pump to stop running.

[0022] In one embodiment, the gas-liquid separator includes:

[0023] The shell has a gas-liquid inlet and a gas phase outlet and a liquid phase outlet respectively located at both ends of the shell along the axial direction;

[0024] A spiral guide plate is spirally arranged inside the housing, extending around the central axis of the housing. Its initial end is located above and close to the gas-liquid inlet, and its end is located close to the liquid phase outlet.

[0025] The gas-liquid inlet, the spiral guide plate, and the shell sidewall together form the spiral channel.

[0026] In one embodiment, the gas-liquid separator further includes:

[0027] A baffle plate is installed between the gas phase outlet and the spiral guide plate.

[0028] Compared with the prior art, the advantages of this utility model are:

[0029] 1. The gas-liquid separator is used to separate the gas and liquid phases of triethylene glycol regenerated condensate, removing water vapor and some other gaseous substances from the triethylene glycol. The triethylene glycol solution after gas-liquid separation can be introduced into the reaction tank. The purifying agent in the purifying agent storage tank is introduced into the reaction tank, where it undergoes an acid-base neutralization reaction with acidic and corrosive substances in the triethylene glycol, such as hydrogen sulfide, thereby purifying the triethylene glycol.

[0030] 2. After the triethylene glycol solution is purified by neutralization reaction in the reaction vessel, it still contains inorganic salts generated by the acid-base reaction, as well as the original solid impurities. The triethylene glycol solution is discharged from the reaction vessel and flows to the filter to remove the fixed impurities in the triethylene glycol.

[0031] 3. When substances such as hydrogen sulfide in the liquid inside the reaction vessel are released and emitted as gas from the outlet, they will first pass through a gas purifier to purify them, adsorbing toxic and odorous substances in the gas, before being discharged into the atmosphere.

[0032] 4. Both the hydraulic pump and the level gauge are electrically connected to the controller. The controller is configured to control the start and stop of the hydraulic pump based on the level value measured by the level gauge: when the measured level value is higher than the highest preset threshold, the controller controls the hydraulic pump to start, and the hydraulic pump draws out the solution in the reaction tank to avoid overflow of the solution in the reaction tank; when the measured level value is lower than the lowest preset threshold, the controller controls the hydraulic pump to stop running to avoid the hydraulic pump running dry due to low liquid content in the reaction tank. Attached Figure Description

[0033] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0034] Figure 1 This is a connection diagram of the triethylene glycol regenerated condensate purification system;

[0035] Figure 2 This is a schematic diagram of a gas-liquid separator;

[0036] Figure 3 This is a schematic diagram of the cross-section of a gas purifier;

[0037] Figure 4This is a schematic diagram of the filter structure;

[0038] Figure label:

[0039] 1. Gas-liquid separator;

[0040] 11. Shell; 111. Gas-liquid inlet; 112. Gas phase outlet; 113. Liquid phase outlet;

[0041] 12. Spiral guide vane; 13. Baffle plate;

[0042] 2. Reaction tank; 3. Purifying agent storage tank;

[0043] 4. Gas purifier; 41. Airflow channel; 42. Activated carbon; 43. Partition;

[0044] 5. Filter; 51. Tube body; 511. Inlet; 512. Outlet; 52. Mounting groove; 53. Filter element; 54. Sealing cap;

[0045] 6. Level gauge; 7. Hydraulic pump; 8. Controller;

[0046] 91. First valve; 92. Second valve; 93. Third valve; 94. Fourth valve; 95. Electric valve; 96. Shut-off valve;

[0047] 101. First conveying pipe; 102. Second conveying pipe; 103. First connecting pipe; 104. Second connecting pipe. Detailed Implementation

[0048] The present invention will be further described below with reference to the accompanying drawings.

[0049] This utility model provides a triethylene glycol regenerated condensate purification system, which includes a gas-liquid separator 1, a reaction tank 2, a filter 5, a purifying agent storage tank 3, and a gas purifier 4.

[0050] The gas-liquid separator 1, the reaction tank 2, and the filter 5 are connected in sequence along the flow direction of the triethylene glycol solution. The gas-liquid separator 1 is used to separate the triethylene glycol regenerated condensate into gas and liquid phases to separate water vapor and some other gaseous substances from the triethylene glycol. The triethylene glycol solution after gas-liquid separation can be introduced into the reaction tank 2.

[0051] The following describes the gas-liquid separator 1, such as... Figure 1 and Figure 2 As shown.

[0052] The gas-liquid separator 1 includes a housing 11, a spiral guide plate 12, and a baffle plate 13.

[0053] The housing 11 has a gas-liquid inlet 111, a gas phase outlet 112 and a liquid phase outlet 113. The gas phase outlet 112 and the liquid phase outlet 113 are respectively located at the two ends of the housing 11 in the axial direction. The gas phase outlet 112 is located at the top of the housing 11 and the liquid phase outlet 113 is located at the bottom of the housing 11.

[0054] The spiral guide plate 12 is disposed inside the housing 11 and extends spirally around the central axis of the housing 11. The initial end of the spiral guide plate 12 is located above the gas-liquid inlet 111 and is disposed close to the gas-liquid inlet 111. The end of the spiral guide plate 12 is disposed close to the liquid phase outlet 113. The gas-liquid inlet 111, the spiral guide plate 12, and the side wall of the housing 11 together constitute a spiral channel.

[0055] The baffle 13 is disposed inside the housing 11 and located between the gas phase outlet 112 and the spiral guide plate 12.

[0056] The baffle 13 is located above the spiral guide plate 12. The baffle 13 is a flat plate that is staggered and installed inside the housing 11. The baffle 13 and the side wall of the housing 11 form a baffle channel.

[0057] The gas-liquid separator 1 is connected to the upstream reboiler via the first delivery pipe 101. The triethylene glycol regenerated condensate discharged from the reboiler can enter the shell 11 through the gas-liquid inlet 111 on the shell 11. After entering the shell 11, the triethylene glycol regenerated condensate is confined in the spiral channel and centrifugally separated along the spiral channel. The fine droplets are separated and flow down from the liquid phase outlet 113, while the gas rises from the gas phase rising channel. When the gas rises to the baffle plate 13, it runs along the tortuous upward baffle channel again. This process separates the fine droplets entrained in the gas again. The gas after the second separation finally exits from the gas phase outlet 112, which greatly improves the separation effect.

[0058] A first valve 91 is also provided at the gas-liquid inlet 111 of the gas-liquid separator 1, and a second valve 92 is connected between the liquid outlet 113 of the gas-liquid separator 1 and the reaction vessel 2. The first valve 91 and the second valve 92 can be manual valves. When it is necessary to maintain the gas-liquid separator 1, the first valve 91 and the second valve 92 can be closed to block the internal and external communication of the gas-liquid separator 1.

[0059] The following describes the purification agent storage tank 3, such as... Figure 1 As shown.

[0060] The purification agent storage tank 3 contains an alkaline purification agent, which can be a 5% sodium hydroxide solution. The purification agent in the storage tank 3 is introduced into the reaction tank 2. In the reaction tank 2, the purification agent reacts with acidic and corrosive substances in the triethylene glycol, such as hydrogen sulfide, in an acid-base neutralization reaction, thereby purifying the triethylene glycol.

[0061] A third valve 93 connects the purifying agent storage tank 3 and the reaction tank 2. The third valve 93 can be manually opened or closed. Opening the third valve 93 allows purifying agent to be added to the reaction tank 2. The inlet of the third valve 93 is connected to the outlet of the purifying agent storage tank 3. The third valve 93 is connected to the reaction tank 2 via a first connecting pipe 103. One end of the first connecting pipe 103 extends to the bottom of the reaction tank 2 to prevent splashing of the purifying agent when it flows into the reaction tank 2, thus improving the flow stability of the purifying agent during the injection process into the reaction tank 2.

[0062] Filter 5 is used to filter solid impurity particles in the triethylene glycol solution. After the triethylene glycol solution is purified by neutralization reaction in reaction tank 2, it still contains inorganic salts generated by the acid-base reaction, as well as the original solid impurities. The triethylene glycol solution is discharged from reaction tank 2 and flows to filter 5 to remove the fixed impurities in the triethylene glycol.

[0063] The following describes gas purifier 4, such as... Figure 1 and Figure 3 As shown.

[0064] Gas purifier 4 is installed at the gas outlet of reaction tank 2. When substances such as hydrogen sulfide in the liquid in reaction tank 2 are released and emitted as gas from the gas outlet, they will first pass through gas purifier 4 for purification to adsorb toxic and odorous substances in the gas before being discharged into the atmosphere.

[0065] In this embodiment, the gas outlet of the reaction vessel 2 is located at the top of the reaction vessel 2. The inlet of the gas purifier 4 is connected to the gas outlet of the reaction vessel 2 via a connecting pipe, and an electric valve 95 is installed on the connecting pipe. A pressure sensor (not shown in the figure) is also installed at the gas outlet of the reaction vessel 2. The pressure sensor and the electric valve 95 are electrically connected to the controller 8. When the pressure sensor detects that the pressure inside the reaction vessel 2 is greater than 0.1 MPa, the controller 8 controls the electric valve 95 to open. At this time, the gas purifier 4 is connected to the reaction vessel 2 to purify the gas escaping from the reaction vessel 2. Only after purification can the gas flow into the atmosphere.

[0066] The gas purifier 4 has several airflow channels 41, which are filled with activated carbon 42. Gas escaping from the outlet of the reaction tank 2 can flow through the airflow channels 41, and the activated carbon 42 in the airflow channels 41 adsorbs the toxic and odorous substances therein. The activated carbon 42 has a removal rate of 99.3% for hydrogen sulfide and a removal rate of 98.7% for VOCs.

[0067] The gas purifier 4 includes several airflow pipes, and the airflow channel 41 is defined by the inner wall of the airflow pipes. Several airflow pipes are spliced ​​together in parallel to form a honeycomb structure.

[0068] Each airflow tube has a regular polygonal cross-section. The cross-section of the airflow tube is preferably a regular hexagon. The airflow tube is fixed by several partitions 43, and two adjacent regular hexagonal airflow tubes can share a partition 43.

[0069] In this embodiment, a hydraulic component is installed downstream of the filter 5 to pump the solution out of the reaction tank 2. The hydraulic component is used to hydraulically transport the solution in the reaction tank 2 to the filter 5 and the equipment or pipeline located downstream of the filter 5. The hydraulic component can be a hydraulic pump 7.

[0070] The triethylene glycol regenerated condensate purification system also includes a level gauge 6, which is at least partially installed inside the reaction tank 2 to measure the liquid level inside the reaction tank 2.

[0071] Both the hydraulic pump 7 and the level gauge 6 are electrically connected to the controller 8. The controller 8 is configured to control the start and stop of the hydraulic pump 7 based on the level value measured by the level gauge 6: when the measured level value is higher than the highest preset threshold, the controller 8 controls the hydraulic pump 7 to start, and the hydraulic pump 7 draws out the solution in the reaction tank 2 to avoid the solution in the reaction tank 2 from overflowing; when the measured level value is lower than the lowest preset threshold, the controller 8 controls the hydraulic pump 7 to stop running to avoid the hydraulic pump 7 from running dry due to the low liquid content in the reaction tank 2.

[0072] The following describes filter 5, such as... Figure 1 and Figure 4 As shown.

[0073] The filter 5 is a Y-shaped filter, comprising a tube 51 for conveying fluid. One end of the tube 51 has an inlet 511, which is the inlet for the fluid before filtration; the other end of the tube 51 has an outlet 512, which is the outlet for the filtered fluid. An installation groove 52 is installed diagonally below the tube 51 for installing a filter element 53, which filters the fluid. A sealing cover 54 is detachably installed on the outer end of the installation groove 52, allowing the filter element 53 to be replaced or cleaned and maintained by opening the sealing cover 54.

[0074] The filter 5 is connected to the reaction vessel 2 via a second connecting pipe 104. One end of the second connecting pipe 104 is connected to the inlet 511 of the filter 5, and the other end of the second connecting pipe 104 extends into the reaction vessel 2 and extends to the bottom of the reaction vessel 2.

[0075] A fourth valve 94 is provided between the filter 5 and the hydraulic pump 7. The inlet of the fourth valve 94 is connected to the outlet 512 on the filter 5, and the outlet end of the fourth valve 94 is connected to the inlet end of the hydraulic pump 7 through a connecting pipe.

[0076] The hydraulic pump 7 is connected to the downstream purification equipment through the second delivery pipe 102, and a shut-off valve 96 is installed on the second delivery pipe 102.

[0077] like Figure 1 As shown, the basic working principle of the triethylene glycol regenerated condensate purification system in this embodiment is as follows:

[0078] The triethylene glycol regenerated condensate discharged from the reboiler is passed into gas-liquid separator 1 for gas-liquid separation to remove water vapor and some other gaseous substances from the triethylene glycol. The triethylene glycol solution after gas-liquid separation can be passed into reaction tank 2. The third valve 93 is opened to replenish the purifying agent stored in purifying agent storage tank 3 into reaction tank 2. The purifying agent reacts with acidic substances such as hydrogen sulfide mixed in the triethylene glycol in reaction tank 2 to undergo an acid-base neutralization reaction, thereby purifying the triethylene glycol. After purification, the triethylene glycol flows out of reaction tank 2 and then flows through filter 5 to remove solid impurities from the triethylene glycol. The triethylene glycol filtered by filter 5 flows to downstream equipment.

[0079] During this process, when the gas released in the reaction tank 2 reaches the preset content, the electric valve 95 opens, and the gas escapes from the outlet of the reaction tank 2 to the gas purifier 4. The gas purifier 4 adsorbs and filters the toxic and odorous substances in the gas, and the gas is then discharged into the atmosphere after filtration.

[0080] Furthermore, during the purification process described above, if the liquid level measured by the level gauge 6 is higher than the highest preset threshold, the controller 8 controls the hydraulic pump 7 to start, and the hydraulic pump 7 draws out the solution in the reaction tank 2 to prevent the solution in the reaction tank 2 from overflowing; if the liquid level measured by the level gauge 6 is lower than the lowest preset threshold, the controller 8 controls the hydraulic pump 7 to stop running to prevent the hydraulic pump 7 from running dry due to the low liquid content in the reaction tank 2.

[0081] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A purification system for triethylene glycol regenerator condensate, comprising: It includes a gas-liquid separator, a reaction vessel, and a filter connected sequentially along the flow direction of the triethylene glycol solution, wherein, The gas-liquid separator is used to separate the gas and liquid in the triethylene glycol regenerated condensate, and the separated triethylene glycol solution can be introduced into the reaction tank. The reaction vessel is also connected to a purification agent storage tank for storing and supplying purification agents. The filter is used to filter solid impurity particles from the triethylene glycol solution; The gas outlet of the reaction vessel is also equipped with a gas purifier.

2. The triethylene glycol regenerated condensate purification system according to claim 1, characterized in that, The gas purifier has several airflow channels, and activated carbon is placed inside the airflow channels.

3. The triethylene glycol regenerated condensate purification system according to claim 2, characterized in that, The gas purifier includes several airflow pipes, the airflow channel is defined by the inner wall of the airflow pipes, and the several airflow pipes are spliced ​​together in parallel to form a honeycomb structure.

4. The triethylene glycol regenerated condensate purification system according to claim 3, characterized in that, The cross-section of each of the airflow pipes is a regular polygon.

5. The triethylene glycol regeneration condensate purification system according to any one of claims 1-4, characterized in that, The gas outlet of the reaction vessel is located at the top of the reaction vessel.

6. The triethylene glycol regeneration condensate purification system according to claim 1, characterized in that, A hydraulic component is located downstream of the filter, which is used to hydraulically transport the solution in the reaction vessel to the filter and the equipment or pipeline located downstream of the filter.

7. The triethylene glycol regenerator condensate polishing system of claim 6, wherein, Also includes: A level gauge is used to measure the liquid level inside the reaction vessel.

8. The triethylene glycol regenerated condensate purification system according to claim 7, characterized in that, The hydraulic component is a hydraulic pump; Both the hydraulic pump and the level gauge are electrically connected to the controller, which is configured to control the start and stop of the hydraulic pump based on the level value measured by the level gauge. When the measured liquid level is higher than the highest preset threshold, the controller controls the hydraulic pump to start; when the measured liquid level is lower than the lowest preset threshold, the controller controls the hydraulic pump to stop running.

9. The triethylene glycol regenerator condensate polishing system of claim 1, wherein, The gas-liquid separator includes: The shell has a gas-liquid inlet and a gas phase outlet and a liquid phase outlet respectively located at both ends of the shell along the axial direction; A spiral guide plate is spirally extended inside the housing around the central axis of the housing. Its initial end is located above and close to the gas-liquid inlet, and its end is located close to the liquid phase outlet. The gas-liquid inlet, the spiral guide plate, and the shell sidewall together form the spiral channel.

10. The triethylene glycol regenerator condensate polishing system of claim 9, wherein, The gas-liquid separator also includes: A baffle plate is installed between the gas phase outlet and the spiral guide plate.

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