Natural gas desulfurization and decarbonization device

Abstract

The utility model relates to the technical field of natural gas desulfurization and decarburization and discloses a natural gas desulfurization and decarburization device. High-pressure natural gas is introduced into one side of the bottom of an absorption tower; the heat exchanger is connected with the bottom of the absorption tower through a rich liquid pipe, and the rich liquid pipe is coiled in the heat exchanger; the regeneration tower is connected with a rich liquid pipe in the heat exchanger, the rich liquid pipe is connected to the upper part of the regeneration tower, the bottom of the regeneration tower is connected with a barren liquid pipe, the barren liquid pipe is coiled in the heat exchanger and exchanges heat with the rich liquid pipe, and the other end of the barren liquid pipe extends out of the heat exchanger and is connected with the top of the absorption tower; according to the present invention, the heat exchanger is installed between the barren liquor pipe and the rich liquor pipe, the heat exchanger exchanges heat of the MDEA solution in the barren liquor pipe and the rich liquor pipe, the MDEA solution entering the regeneration tower is heated, the heat exchanger can further cool the MDEA solution flowing back to the absorption tower, and the MDEA solution can be recycled. And the temperature of the MDEA solution entering the regeneration tower can be prevented from being too low.

Description

Technical Field

[0001] This application relates to the field of natural gas desulfurization and decarbonization technology, for example, to a natural gas desulfurization and decarbonization device. Background Technology

[0002] Currently, after natural gas is extracted, the sulfides and carbides mixed in it reduce its calorific value and combustion efficiency. By removing sulfur and carbon, the calorific value and combustion efficiency of natural gas can be improved, thereby increasing energy utilization efficiency.

[0003] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0004] Traditional natural gas desulfurization and decarbonization processes require desulfurization of the natural gas first, followed by decarbonization again, which increases the desulfurization and decarbonization workflow. Furthermore, the rich solution after replacement needs to be heated for reaction, and the lean solution after reaction needs to be cooled and refluxed. Utility Model Content

[0005] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0006] This disclosure provides a natural gas desulfurization and decarbonization device to solve the problem of energy waste caused by the simultaneous need for cooling and heating of the solution during natural gas desulfurization and decarbonization.

[0007] In some embodiments, the natural gas desulfurization and decarbonization device includes: an absorption tower, into which high-pressure natural gas is introduced at one bottom side, the absorption tower being used to absorb impurities in the natural gas, and purified natural gas being discharged from the top of the absorption tower; a heat exchanger, connected to the bottom of the absorption tower via a rich liquid pipe, the rich liquid pipe being coiled inside the heat exchanger; and a regeneration tower, connected to the rich liquid pipe inside the heat exchanger, the rich liquid pipe being connected to the upper part of the regeneration tower, a lean liquid pipe being connected to the bottom of the regeneration tower, the lean liquid pipe being coiled inside the heat exchanger to exchange heat with the rich liquid pipe, and the other end of the lean liquid pipe extending out of the heat exchanger and connected to the top of the absorption tower.

[0008] In some embodiments, a reboiler is connected to the side of the regeneration tower for circulating heating of the solution within the regeneration tower.

[0009] In some embodiments, the top of the regeneration tower is provided with a gas delivery pipe, a cooler is connected to the middle of the gas delivery pipe, and the other end of the gas delivery pipe is connected to the middle of the separator. The bottom of the separator is connected to the middle of the regeneration tower through a return water pipe.

[0010] In some embodiments, the separator is provided with an exhaust pipe at its upper part, a blower is connected to the exhaust pipe, and the exhaust pipe is connected to the complexed iron desulfurization tank.

[0011] In some embodiments, the complexed iron desulfurization tank is provided with an outlet pipe at the top.

[0012] In some embodiments, the bottom of the complexed iron desulfurization tank is connected to a liquid delivery pipe, which is connected to the upper part of the reduction tower.

[0013] In some embodiments, the reduction tower is provided with a liquid outlet pipe on its side, and the other end of the liquid outlet pipe is connected to the upper part of the complexed iron desulfurization tank.

[0014] In some embodiments, the reduction tower is provided with a discharge pipe at the bottom.

[0015] In some embodiments, the liquid outlet pipe is connected to the upper part of the complexed iron desulfurization tank.

[0016] The natural gas desulfurization and decarbonization device provided in this disclosure can achieve the following technical effects:

[0017] By installing a heat exchanger between the lean solution and the rich solution, the MDEA solution in the lean solution and the rich solution are heated to reduce energy waste in the regeneration tower. The heat exchanger can also cool the MDEA solution returning to the absorption tower, preventing excessive temperature changes in the absorption tower and preventing the MDEA solution entering the regeneration tower from being too cold, thus reducing energy waste.

[0018] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0019] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0020] Figure 1 This is a schematic diagram of the structure of the natural gas desulfurization and decarbonization device provided in the embodiments of this disclosure;

[0021] Figure 2 This is a schematic diagram of the marking structure of the natural gas desulfurization and decarbonization device provided in the embodiments of this disclosure;

[0022] Figure label:

[0023] 100. Absorption tower; 101. Heat exchanger; 102. Rich liquid pipe; 103. Lean liquid pipe; 200. Regeneration tower; 201. Reboiler; 202. Gas conveying pipe; 203. Cooler; 204. Return water pipe; 300. Separator; 301. Exhaust pipe; 302. Blower; 400. Complexed iron desulfurization tank; 401. Gas outlet pipe; 402. Liquid conveying pipe; 500. Reduction tower; 501. Liquid outlet pipe; 502. Discharge pipe. Detailed Implementation

[0024] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0025] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0026] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0027] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0028] Unless otherwise stated, the term "multiple" means two or more.

[0029] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0030] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0032] Combination Figure 1-2 As shown in the figure, this disclosure provides a natural gas desulfurization and decarbonization device, including: an absorption tower 100, through which high-pressure natural gas is introduced on one side of the bottom, the absorption tower 100 is used to absorb impurities in the natural gas, and the purified natural gas is discharged from the top of the absorption tower 100; a heat exchanger 101, connected to the bottom of the absorption tower 100 through a rich liquid pipe 102, and the rich liquid pipe 102 is coiled inside the heat exchanger 101; a regeneration tower 200, connected to the rich liquid pipe 102 inside the heat exchanger 101, and the rich liquid pipe 102 is connected to the upper part of the regeneration tower 200, the bottom of the regeneration tower 200 is connected to a lean liquid pipe 103, the lean liquid pipe 103 is coiled inside the heat exchanger 101 to exchange heat with the rich liquid pipe 102, and the other end of the lean liquid pipe 103 extends out of the heat exchanger 101 and is connected to the top of the absorption tower 100.

[0033] Using the natural gas desulfurization and decarbonization device provided in this embodiment, MDEA solution can be transported into the absorption tower 100 through the lean liquid pipe 103. Unreacted natural gas can be introduced into the bottom of the absorption tower 100. The MDEA solution transported into the absorption tower 100 allows the natural gas entering the absorption tower 100 to undergo an absorption reaction. The purified natural gas can be discharged from the top of the absorption tower 100. The MDEA solution can adsorb hydrogen sulfide and carbon dioxide in the natural gas, and displace the hydrogen sulfide and carbon dioxide in the natural gas. The purified natural gas can then be discharged through the rich liquid pipe 103. 02. The solution is fed into regeneration tower 200 for heating. The heating in regeneration tower 200 evaporates the hydrogen sulfide, carbon dioxide, and water in the MDEA and removes them from the regeneration tower 200. The MDEA solution with the displaced hydrogen sulfide and carbon dioxide in regeneration tower 200 enters absorption tower 100 through lean liquid pipe 103 for absorption of impurities in the natural gas. When natural gas is fed into absorption tower 100, the gas pressure decreases after entering absorption tower 100. The natural gas absorbs a large amount of heat after depressurization, causing the temperature of the MDEA in absorption tower 100 to drop. The low-temperature MDEA mixed with hydrogen sulfide and... Carbon dioxide is then transported to the regeneration tower 200 via the rich solution pipe 102. The regeneration tower 200 requires heating of the MDEA solution. Since excessive cooling of the MDEA necessitates significant heat during reheating, the MDEA solution in the regeneration tower 200 is heated to boiling, allowing hydrogen sulfide and carbon dioxide to be expelled. The MDEA solution, now free of hydrogen sulfide and carbon dioxide, is then returned to the absorption tower 100 via the lean solution pipe 103. The high temperature of the MDEA solution can easily increase the temperature within the absorption tower 100. Therefore, a heat exchanger is installed between the lean solution pipe 103 and the rich solution pipe 102. 101. Heat exchanger 101 is used to exchange heat between the lean solution tube 103 and the rich solution tube 102. This heats the MDEA solution entering the regeneration tower 200, reducing energy waste in the regeneration tower 200. Heat exchanger 101 can also cool the MDEA solution returning to the absorption tower 100, preventing excessive temperature changes in the absorption tower 100 and preventing the MDEA solution entering the regeneration tower 200 from being too cold, thus reducing energy waste. The lean solution tube 103 is coiled inside the heat exchanger 101 to increase heat exchange efficiency.

[0034] Optionally, a reboiler 201 is connected to the side of the regeneration tower 200 for circulating heating of the solution within the regeneration tower 200. In this way, the reboiler 201 on the side of the regeneration tower 200 can heat the MDEA solution within the regeneration tower 200 to 115°C, thereby facilitating the evaporation and discharge of hydrogen sulfide, carbon dioxide, and water from the MDEA solution, allowing these substances to evaporate and exit from the regeneration tower 200.

[0035] Optionally, the top of the regeneration tower 200 is provided with a gas delivery pipe 202, the middle of which is connected to a cooler 203, and the other end of the gas delivery pipe 202 is connected to the middle of a separator 300. The bottom of the separator 300 is connected to the middle of the regeneration tower 200 through a return water pipe 204. In this way, the gas delivery pipe 202 at the top of the regeneration tower 200 can discharge a mixture of hydrogen sulfide, carbon dioxide, and water through the delivery pipe. The hydrogen sulfide, carbon dioxide, and water gas passing through the delivery pipe are cooled by the cooler 203, and the water vapor condenses into water and part of the MDEA solution. The gaseous hydrogen sulfide, carbon dioxide, and the condensed water and part of the MDEA solution enter the separator 300. The condensed water and part of the MDEA solution then flow back into the regeneration tower 200 through the return water pipe 204, thereby replenishing the solution in the regeneration tower 200. The carbon dioxide and hydrogen sulfide are discharged from the separator 300.

[0036] Optionally, the separator 300 is provided with an exhaust pipe 301 at its upper part, and a blower 302 is connected to the exhaust pipe 301. The exhaust pipe 301 is connected to the complexed iron desulfurization tank 400. In this way, carbon dioxide and hydrogen sulfide can be discharged through the exhaust pipe 301 on the separator 300, and the blower 302 on the exhaust pipe 301 can pressurize the carbon dioxide and hydrogen sulfide entering the complexed iron desulfurization tank 400, which can increase the reaction between hydrogen sulfide and complexed iron in the complexed iron desulfurization tank 400, thereby better separating carbon dioxide and hydrogen sulfide to obtain carbon dioxide without hydrogen sulfide.

[0037] Optionally, the complexed iron desulfurization tank 400 is provided with an exhaust pipe 401 at its upper part. In this way, the exhaust pipe 401 can discharge carbon dioxide from the complexed iron desulfurization tank 400, thereby separating carbon dioxide from hydrogen sulfide.

[0038] Optionally, the bottom of the complexed iron desulfurization tank 400 is connected to a liquid delivery pipe 402, which is connected to the upper part of the reduction tower 500. In this way, the liquid delivery pipe 402 can transport the complexed iron solution mixed with sulfur into the reduction tower 500, and air is introduced into the reduction tower 500 so that the sulfur in the complexed iron reacts with the air to form a solid substance.

[0039] Optionally, the reduction tower 500 is provided with a liquid outlet pipe 501 on its side. In this way, solid sulfur and complexed iron solution are separated in the reduction tower 500, and the separated complexed iron solution is then discharged through the liquid outlet pipe 501.

[0040] Optionally, the reduction tower 500 is provided with a discharge pipe 502 at the bottom, so that the discharge pipe 502 at the bottom of the reduction tower 500 can discharge solid sulfur.

[0041] Optionally, the liquid outlet pipe 501 is connected to the upper part of the complexed iron desulfurization tank 400. In this way, the separated complexed iron solution is discharged through the liquid outlet pipe 501, and the separated complexed iron solution enters the complexed iron desulfurization tank 400 through the liquid outlet pipe 501 for subsequent desulfurization reaction.

[0042] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A natural gas desulfurization and decarbonization device, characterized in that, include: The absorption tower (100) is supplied with high-pressure natural gas on one side of its bottom. The absorption tower is used to absorb impurities in the natural gas, and the purified natural gas is discharged from the top of the absorption tower (100). The heat exchanger (101) is connected to the bottom of the absorption tower (100) via a rich liquid pipe (102), and the rich liquid pipe (102) is coiled inside the heat exchanger. The regeneration tower (200) is connected to the rich liquid pipe (102) in the heat exchanger (101), and the rich liquid pipe (102) is connected to the upper part of the regeneration tower (200). The bottom of the regeneration tower (200) is connected to the lean liquid pipe (103). The lean liquid pipe (103) is coiled in the heat exchanger (101) to exchange heat with the rich liquid pipe (102), and the other end of the lean liquid pipe (103) extends out of the heat exchanger (101) and is connected to the top of the absorption tower (100).

2. The natural gas desulfurization and decarbonization device according to claim 1, characterized in that, A reboiler (201) is connected to the side of the regeneration tower (200) for circulating heating of the solution inside the regeneration tower (200).

3. The natural gas desulfurization and decarbonization device according to claim 1, characterized in that, The top of the regeneration tower (200) is provided with a gas delivery pipe (202), a cooler (203) is connected to the middle of the gas delivery pipe (202), and the other end of the gas delivery pipe (202) is connected to the middle of the separator (300). The bottom of the separator (300) is connected to the middle of the regeneration tower (200) through a return water pipe (204).

4. The natural gas desulfurization and decarbonization device according to claim 3, characterized in that, The separator (300) is provided with an exhaust pipe (301) on its upper part, and a blower (302) is connected to the exhaust pipe (301). The exhaust pipe (301) is connected to the complexed iron desulfurization tank (400).

5. The natural gas desulfurization and decarbonization device according to claim 4, characterized in that, The complexed iron desulfurization tank (400) is equipped with an exhaust pipe (401) at the top.

6. The natural gas desulfurization and decarbonization device according to claim 5, characterized in that, The bottom of the complexed iron desulfurization tank (400) is connected to a liquid delivery pipe (402), which is connected to the upper part of the reduction tower (500).

7. The natural gas desulfurization and decarbonization device according to claim 6, characterized in that, The reduction tower (500) is provided with a liquid outlet pipe (501) on its side, and the other end of the liquid outlet pipe (501) is connected to the upper part of the complexed iron desulfurization tank (400).

8. The natural gas desulfurization and decarbonization device according to claim 6, characterized in that, The reduction tower (500) is equipped with a discharge pipe (502) at the bottom.

9. The natural gas desulfurization and decarbonization device according to claim 7, characterized in that, The liquid outlet pipe (501) is connected to the upper part of the complexed iron desulfurization tank (400).

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