CN210070699U - Lean-rich liquid heat exchanger for acid gas removal by alcohol amine method - Google Patents
Lean-rich liquid heat exchanger for acid gas removal by alcohol amine method Download PDFInfo
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- CN210070699U CN210070699U CN201920829384.6U CN201920829384U CN210070699U CN 210070699 U CN210070699 U CN 210070699U CN 201920829384 U CN201920829384 U CN 201920829384U CN 210070699 U CN210070699 U CN 210070699U
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Abstract
The utility model relates to a lean and rich liquid heat exchanger that is used for alcohol amine method to take off sour gas in the oil gas warehousing and transportation field mainly by the shell body, one-level cold fluid import, the tube sheet, purifier change mouthful, amine liquid purifier A, cold flow straight tube way, the baffle, one-level hot-fluid import, amine liquid purifier B, the baffle, one-level cold fluid export, one-level hot-fluid export, second grade hot-fluid import, second grade cold fluid import, cold flow ripples pipeline, second grade hot-fluid export, second grade cold fluid exports and constitutes, its characterized in that: the heat exchanger adopts a two-stage series structure; an amine liquid purification device A and an amine liquid purification device B are arranged in the primary heat exchanger; the first-stage heat exchanger adopts a cold flow straight pipeline, and the second-stage heat exchanger adopts a cold flow corrugated pipeline. The utility model has the advantages that: compact structure can effectively prevent the inside by the corruption of heat exchanger and improve the heat transfer effect.
Description
Technical Field
The utility model relates to a poor rich liquid heat exchanger that is used for acid gas is taken off to alcohol amine method in the oil gas warehousing and transportation field.
Background
The natural gas produced from the field often contains H2S、CO2And the presence of acidic components can cause corrosion of storage and transportation equipment and pipelines, and sulfide can pollute the atmospheric environment after being wound, so that the removal of the acidic gas in the natural gas is one of the main tasks of natural gas purification. The prior method for removing acidic components from natural gas mainly comprises the following steps: chemical solvent absorption, physical chemical absorption, direct oxidation, etc., of which the alcohol amine method is the most widely used method among chemical solvent absorption. In the natural gas purification process, the hydramine aqueous solution absorbs H at low temperature and high pressure in the absorption tower2S、CO2Gas, generating corresponding amine salt and giving off heat; in the regeneration tower, the solution is heated to a certain temperature, and the reaction is carried out in the opposite direction under low pressure and high temperature, namely, the amine salt in the solution is decomposed, the acid gas is released again, and simultaneously, the solution is regenerated. The main equipment of the alcohol amine method comprises: the absorption tower, the stripping tower, the lean/rich liquid heat exchanger, the lean liquid cooler and the rich liquid flash tank, wherein the heat exchange equipment accounts for a large proportion. However, the heat exchange coefficient of the heat exchange equipment used in the process flow is low, the occupied area of the device is large, and the device is easy to corrode, so that the equipment investment and energy consumption indexes are high.
Disclosure of Invention
The utility model discloses the purpose is: in order to improve the efficiency of gas-liquid heat exchange in an oil gas gathering and transportation system, the lean-rich liquid heat exchanger for acid gas removal by an alcohol amine method is provided, the heat exchanger is compact in structure, the inside of the heat exchanger can be effectively prevented from being corroded, and the heat exchange effect can be improved.
The utility model adopts the technical proposal that:
the utility model relates to a lean and rich liquid heat exchanger for acid gas is taken off to hydramine method, mainly by the shell body, one-level cold flow body import, the tube sheet, purifier change the mouth, amine liquid purifier A, the cold flow straight tube way, the baffle, the import of one-level hot-fluid, amine liquid purifier B, the baffle, one-level cold flow fluid export, the export of one-level hot-fluid, the import of second grade cold flow body, cold flow ripple pipeline, the export of second grade hot-fluid, second grade cold flow body exports and constitutes, its characterized in that: the heat exchanger adopts a two-stage series structure; an amine liquid purification device A and an amine liquid purification device B are arranged in the primary heat exchanger; the first-stage heat exchanger adopts a cold flow straight pipeline, and the second-stage heat exchanger adopts a cold flow corrugated pipeline.
The utility model has the advantages that: compact structure can effectively prevent the inside by the corruption of heat exchanger and improve the heat transfer effect.
Drawings
FIG. 1 is a flow chart of the acid gas removal process by the alcohol amine method.
Fig. 2 is a schematic structural diagram of a lean-rich liquid heat exchanger for acid gas removal by an alcohol amine method.
Fig. 3 is a schematic view of the internal flow of the alcohol amine process acid gas removal heat exchanger of fig. 2.
In the figure: 1. the device comprises an outer shell, 2, a primary cold fluid inlet, 3, a tube plate, 4, a purifying device replacing port, 5, an amine liquid purifying device A, 6, a cold fluid straight pipeline, 7, a baffle, 8, a primary hot fluid inlet, 9, an amine liquid purifying device B, 10, a partition plate, 11, a primary cold fluid outlet, 12, a primary hot fluid outlet, 13, a secondary cold fluid inlet, 14, a secondary hot fluid inlet, 15, a cold fluid corrugated pipeline, 16, a secondary cold fluid outlet and 17, a secondary hot fluid outlet.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1, the technological process for removing acid gas by the alcohol amine method comprises the following steps: the raw gas enters the tower from the lower part of the absorption tower and flows from top to bottom, and is in countercurrent contact with the alcohol amine solution from top to bottom, and after the acid gas is absorbed by the alcohol amine solution, the purified natural gas flows out from the top of the tower. And the rich alcohol amine liquid after acid gas absorption flows out from the bottom of the absorption tower, passes through a flash tank, passes through a lean/rich liquid heat exchanger and is sent into a regeneration tower. And the regenerated alcohol amine lean solution flows out from the bottom of the regeneration tower, exchanges heat with cold rich solution in a heat exchanger, is further cooled in a cooler, and then is circulated back to the absorption tower.
As shown in fig. 2, the utility model relates to a lean and rich liquid heat exchanger for acid gas is taken off to alcohol amine method, a lean and rich liquid heat exchanger for acid gas is taken off to alcohol amine method mainly by shell body (1), one-level cold fluid import (2), tube sheet (3), purifier change mouth (4), amine liquid purifier A (5), cold flow straight tube way (6), baffle (7), one-level hot-fluid import (8), amine liquid purifier B (9), baffle (10), one-level cold fluid export (11), one-level hot-fluid export (12), second grade cold fluid import (13), second grade hot-fluid import (14), cold flow ripple pipeline (15), second grade cold fluid export (16), second grade hot-fluid export (17) are constituteed, its characterized in that: the heat exchanger adopts a two-stage series structure; an amine liquid purification device A (5) and an amine liquid purification device B (9) are arranged in the primary heat exchanger; the primary heat exchanger adopts a cold flow straight pipeline (6), and the secondary heat exchanger adopts a cold flow corrugated pipeline (15).
When cold rich liquid enters the heat exchanger from the first-level cold fluid inlet 2 on the left side of the heat exchanger and flows to the cold fluid straight pipeline (6), hot lean liquid enters the amine liquid purification device 7 from the first-level hot fluid inlet (8) on the right side of the heat exchanger and is treated by chloride ions, and then the hot lean liquid is sent to the shell pass of the heat exchanger to flow. The cold rich liquid flows in the cold flow straight pipeline (6), the hot lean liquid flows outside the cold flow straight pipeline, the stroke of the hot lean liquid flowing inside the cold flow straight pipeline is called a tube side, the stroke of the hot lean liquid flowing outside the cold flow straight pipeline is called a shell side, and the cold rich liquid and the hot lean liquid exchange heat through the cold flow straight pipeline. The cold rich liquid flows from right to left along the cold straight pipeline (6) during the primary heat exchange, flows from right to left along the cold corrugated pipeline (15) during the secondary heat exchange, the hot lean liquid flows from bottom to top and from left to right along the baffle (7) during the primary heat exchange, the hot lean liquid flows from top to bottom and from right to left along the baffle (7) during the secondary heat exchange, the black arrows in the figure 2 are the flowing directions of the cold rich liquid, and the black arrows are the flowing directions of the hot lean liquid. When the cold rich liquid flows downwards to the tube plate, the cold rich liquid enters the cold flow pipeline and flows from left to right, meanwhile, the hot lean liquid enters the heat exchanger and flows from right to left along the baffle plate, and indirect heat exchange is carried out on the hot lean liquid and the rich liquid flowing from left to right through the cold flow pipeline. The principle of secondary heat exchange is the same. The rich liquid after heat exchange flows out of the heat exchanger from the secondary cold fluid outlet (16), and the lean liquid after heat exchange flows out of the heat exchanger from the secondary hot fluid outlet (17), namely the heat exchange process is finished.
Wherein, the hot barren liquor can enter the shell pass to flow after being treated by the amine liquor purification device A (5) and the amine liquor purification device B (9). The amine liquid purification device can remove heat stability salt, such as salt generated by chloride ions and sulfate radicals, thereby reducing the corrosion in the system and effectively preventing the corrosion in the heat exchanger.
Claims (4)
1. The utility model provides a lean and rich liquid heat exchanger for acid gas is taken off to alcohol amine method, mainly by shell body (1), one-level cold fluid import (2), tube sheet (3), purifier change mouth (4), amine liquid purifier A (5), cold flow straight pipeline (6), baffle (7), one-level hot-fluid import (8), amine liquid purifier B (9), baffle (10), one-level cold fluid export (11), one-level hot-fluid export (12), second grade cold fluid import (13), second grade hot-fluid import (14), cold flow ripple pipeline (15), second grade cold fluid export (16), second grade hot-fluid export (17) are constituteed, its characterized in that: the heat exchanger adopts a two-stage series structure; an amine liquid purification device A (5) and an amine liquid purification device B (9) are arranged in the primary heat exchanger; the primary heat exchanger adopts a cold flow straight pipeline (6), and the secondary heat exchanger adopts a cold flow corrugated pipeline (15).
2. The lean-rich liquid heat exchanger for acid gas removal by an alcohol amine method according to claim 1, characterized in that: what this heat exchanger adopted is two-stage serial structure, the upper portion of heat exchanger is one-level cold fluid import (2), one-level hot-fluid import (8), the middle part of heat exchanger is that one-level cold fluid export (11) are connected with second grade cold fluid import (13), one-level hot-fluid export (12) are connected with second grade hot-fluid import (14), the bottom of heat exchanger is second grade cold fluid export (16), second grade hot-fluid export (17), the structure of two-stage serial not only compact structure, reducible area, and can reach abundant heat transfer's effect, thereby it is extravagant to reduce the energy consumption.
3. The lean-rich liquid heat exchanger for acid gas removal by an alcohol amine method according to claim 1, characterized in that: an amine liquid purification device A (5) and an amine liquid purification device B (9) are installed in the primary heat exchanger, and the amine liquid purification device can remove chloride ions and heat stable salts in amine liquid used in an alcohol amine method acid gas removal process so as to achieve the effect of effectively preventing the inside of the heat exchanger from being corroded, wherein the heat stable salts are the main reasons for corrosion of the inside of the heat exchanger.
4. The lean-rich liquid heat exchanger for acid gas removal by an alcohol amine method according to claim 1, characterized in that: the primary heat exchanger adopts a cold flow straight pipeline (6), the secondary heat exchanger adopts a cold flow corrugated pipeline (15), and the disturbance of fluid micro molecules is increased by the straight pipeline of the cold flow pipeline flowing to the cold flow corrugated pipeline so as to improve the heat exchange efficiency of the fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201920829384.6U CN210070699U (en) | 2019-06-04 | 2019-06-04 | Lean-rich liquid heat exchanger for acid gas removal by alcohol amine method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920829384.6U CN210070699U (en) | 2019-06-04 | 2019-06-04 | Lean-rich liquid heat exchanger for acid gas removal by alcohol amine method |
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| CN210070699U true CN210070699U (en) | 2020-02-14 |
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| CN201920829384.6U Expired - Fee Related CN210070699U (en) | 2019-06-04 | 2019-06-04 | Lean-rich liquid heat exchanger for acid gas removal by alcohol amine method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112432517A (en) * | 2020-10-28 | 2021-03-02 | 中石化宁波工程有限公司 | Lean-rich methanol heat exchange system and heat exchange method |
-
2019
- 2019-06-04 CN CN201920829384.6U patent/CN210070699U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112432517A (en) * | 2020-10-28 | 2021-03-02 | 中石化宁波工程有限公司 | Lean-rich methanol heat exchange system and heat exchange method |
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Granted publication date: 20200214 Termination date: 20210604 |
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| CF01 | Termination of patent right due to non-payment of annual fee |