Large-scale gas flow molecular sieve desulfurization device

Abstract

The invention discloses a large-scale gas flow molecular sieve desulfurization device. The device comprises a first filter assembly, two ends of the desulfurization and dehydration assembly are respectively connected with the first filtering assembly and the second filtering assembly through valve assemblies, and the end part of the second filtering assembly is connected with a metering assembly. Through molecular sieve desulfurization, on one hand, rapid purification of hydrogen sulfide can be realized, on the other hand, the problems of low sulfur content and large treatment capacity in gas storage desulfurization are solved, the desulfurization operation treatment efficiency is improved, and compared with an MDEA direct desulfurization process, the equipment size can be reduced, the land can be saved, and the production cost input can be reduced. And moreover, the molecular sieve desulfurization operation can effectively avoid the corrosion problem of transportation pipelines and equipment, so that the risk of leakage is avoided to a certain extent, and a safe and reliable operation environment is provided for operators.

Description

Technical Field

[0001] The present invention belongs to the technical field of natural gas desulfurization, and particularly relates to a molecular sieve desulfurization device for a large-scale gas volume. Background Technique

[0002] H2S is a harmful impurity in oil and gas fields. It not only corrodes transportation pipelines, equipment, etc., affects subsequent processing processes, but also seriously threatens human safety. The H2S content in the gas reservoir of the Leiwanlong gas storage well area is 678.02 mg / m 3 , which is rich in saturated water, and the produced gas needs to be desulfurized and dehydrated.

[0003] Currently, the process method for desulfurization needs to be selected according to the sulfur content. If the latent sulfur content is small (S < 0.1 t / d), the dry desulfurization process is mainly used; if the latent sulfur content is large (S ≥ 5 t / d), the alkanolamine desulfurization + sulfur recovery process is used; if the latent sulfur content is medium (0.1 - 5 t / d) between the above two, the liquid-phase redox process is adopted, such as the complex iron and biological desulfurization direct desulfurization processes, etc.

[0004] In purification plants, due to the large processing volume and high latent sulfur content, the alkanolamine desulfurization process or the complex iron desulfurization process is often used. The alkanolamine desulfurization process has the advantages of low regeneration energy consumption, high gas purification degree, and low corrosion degree; the complex iron desulfurization process has the advantages of high hydrogen sulfide removal rate, wide application range, large operation flexibility, environmental friendliness, and simple process. However, for gas storage reservoirs, as the injection and production cycles increase, the acid gases in the formation are continuously washed, and the H2S content and free water content in the formation mixed fluid gradually decrease. In addition, the gas production scale of gas storage reservoirs is large. Directly adopting the alkanolamine desulfurization process or the complex iron oxidation desulfurization process of treatment plants requires large equipment size and high investment, resulting in waste of resources. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems in the prior art, and provides a molecular sieve desulfurization device for a large-scale gas volume.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions to be realized:

[0007] A molecular sieve desulfurization device for a large-scale gas volume, comprising:

[0008] A first filtration assembly;

[0009] A desulfurization and dehydration assembly, both ends of which are respectively connected to the first filtration assembly and the second filtration assembly through valve assemblies, and the end of the second filtration assembly is connected to a metering assembly.

[0010] Preferably, the desulfurization and dehydration assembly includes a desulfurization and dehydration tower and a porcelain grille. There are multiple desulfurization and dehydration towers, and a first working area and a second working area are provided in each of the multiple desulfurization and dehydration towers. The first working area and the second working area are separated by the porcelain grille.

[0011] Preferably, the first working area is a dehydration molecular sieve, the second working area is a desulfurization molecular sieve, and the first working area is located below the second working area.

[0012] Preferably, the number of the desulfurization and dehydration towers is four. Three of the desulfurization and dehydration towers are used for adsorption, and the other desulfurization and dehydration tower is used for regeneration.

[0013] Preferably, the first filtration assembly includes a first pre-filter separator and a second pre-filter separator, and both the first and second pre-filter separators are connected to one end of the desulfurization and dehydration assembly.

[0014] Preferably, the second filtration assembly includes a first post-filter separator and a second post-filter separator, and both the first and second post-filter separators are connected to the other end of the desulfurization and dehydration assembly.

[0015] Preferably, the first post-filter separator and the second post-filter separator have the same structure.

[0016] Preferably, it further includes:

[0017] A pressurization assembly;

[0018] A heat exchange assembly, which is connected to the pressurization assembly through a flow detection part and a ball valve assembly;

[0019] A cooling assembly, which is connected to the heat exchange assembly;

[0020] A regeneration gas separator, one end of which is connected to the cooling assembly and the other end is connected to a regeneration gas compressor unit.

[0021] Preferably, the flow detection part is a flowmeter.

[0022] Preferably, the heat exchange assembly is a plate and shell heat exchanger.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. By desulfurizing with molecular sieves, on the one hand, rapid purification of hydrogen sulfide can be achieved. On the other hand, the problem of low sulfur content but large treatment volume in gas storage desulfurization is solved, improving the desulfurization operation efficiency. Compared with the direct MDEA desulfurization process, it can reduce the equipment size, save land, and reduce the production cost investment. Moreover, the molecular sieve desulfurization operation can effectively avoid the corrosion of transportation pipelines and equipment, and to a certain extent, eliminate the risk of leakage, providing a safe and reliable working environment for operators.

[0025] 2. The desulfurization and dehydration tower is divided into upper and lower sections by a partition, separated in the middle by a porcelain grid, and filled with different types of molecular sieves. The upper layer is filled with desulfurization molecular sieves, and the lower layer is filled with dehydration molecular sieves to achieve simultaneous desulfurization and dehydration, reducing the operation process.

[0026] 3. By using the desulfurization and dehydration tower, two processes of desulfurization and dehydration can be achieved simultaneously in the same device, reducing the process and lowering the device investment.

[0027] 4. After the raw gas is desulfurized and dehydrated by molecular sieves, it becomes dry gas and enters the downstream gas distribution area. When the molecular sieve is regenerated, the regeneration gas carries H2S and becomes a rich regeneration gas, which enters the MDEA desulfurization + complex iron sulfur recovery process for subsequent desulfurization and sulfur recovery.

[0028] 5. By using multiple columns of molecular sieve desulfurization towers, the adsorption and regeneration processes can be flexibly switched. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a schematic diagram of the overall molecular sieve desulfurization device for large-scale gas volume provided by the present invention;

[0031] Figure 2 It is a schematic diagram of the desulfurization and dehydration tower in the molecular sieve desulfurization device for large-scale gas volume provided by the present invention;

[0032] Wherein: 1. First filtration component; 101. First pre-filter separator; 102. Second pre-filter separator; 2. Valve component; 201. First pneumatic valve; 202. Second pneumatic valve; 203. Third pneumatic valve; 204. Fourth pneumatic valve; 3. Desulfurization and dehydration tower; 4. Regenerated gas compressor unit; 5. Heat exchange component; 501. First plate and shell heat exchanger; 502. Second plate and shell heat exchanger; 6. Regenerated gas separator; 7. Regenerated gas air cooler; 8. Blowdown and liquid separation tank; 9. First flowmeter; 10. Second flowmeter; 11. Plate and shell heater; 12. Ball valve component; 1201. First electric ball valve; 1202. Second electric ball valve; 1203. Third electric ball valve; 1204. Fourth electric ball valve; 1205. Fifth electric ball valve; 13. Second filtration component; 1301. First post-filter separator; 1302. Second post-filter separator; 14. Regenerated gas MDEA desulfurization device; 15. First high-pressure blowdown system; 16. Gas gathering and distribution area; 17. Sewage treatment system; 18. Heat transfer oil conveying system; 19. Heat transfer oil recovery system; 20. Dry gas metering area; 21. Second high-pressure blowdown system; 22. Lean gas boosting component. Detailed implementation manners

[0033] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Components of the embodiments of the present invention described and illustrated herein can generally be arranged and designed in a variety of different configurations.

[0034] Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] It should be noted that: like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0036] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0037] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0038] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected" are understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0039] The following further describes the present invention in detail with reference to the drawings:

[0040] Embodiment 1:

[0041] The embodiment of the present invention provides a large-scale gas volume molecular sieve desulfurization device, including: a first filtration component 1; a valve component 2, located at both ends of the desulfurization and dehydration component, and a second filtration component 13 is connected to the end of the desulfurization and dehydration component. As Figure 1As shown in the figure, both ends of the desulfurization and dehydration assembly are respectively connected to the first filtration assembly 1 and the second filtration assembly 13 through the valve assembly 2. A metering assembly is connected to the end of the second filtration assembly 13. For this metering assembly, one path from the end of the second filtration assembly 13 goes to the dry gas metering area 20, and the other path goes through the metering assembly to the first plate and shell heat exchanger 501 and the second plate and shell heat exchanger 502; the first filtration assembly 1 includes a first pre-filter separator 101 and a second pre-filter separator 102, and the first pre-filter separator 101 and the second pre-filter separator 102 have the same structure. Among them, both the first pre-filter separator 101 and the second pre-filter separator 102 are connected to the valve assembly 2 through pipelines. The first pre-filter separator 101 is in a normal use state, and the second pre-filter separator 102 is in a standby state; the valve assembly 2 is then connected to the desulfurization and dehydration assembly through a pipeline. The second filtration assembly 13 includes a first post-filter separator 1301 and a second post-filter separator 1302. Both the first post-filter separator 1301 and the second post-filter separator 1302 are connected to the metering assembly through a pipeline. The first post-filter separator 1301 is in a normal use state, and the second post-filter separator 1302 is in a standby state. The sulfur-containing natural gas is transported from the gas gathering and distribution area 16, passes through the first pre-filter separator 101 for filtration and separation, and then reaches the molecular sieve desulfurization and dehydration assembly. There is a fifth electric ball valve 1205 in front of the first pre-filter separator 101. The fifth electric ball valve 1205 is used to control the gas flow direction, so that the gas passes through the separation sieve desulfurization and dehydration assembly from top to bottom and enters the first post-filter separator 1301 for further filtration. After filtration, the dry gas purification gas goes to the metering assembly. Valve assemblies 2 are installed before and after the molecular sieve desulfurization and dehydration assembly, and the valve assemblies 2 can switch the desulfurization and dehydration and regeneration processes.

[0042] In this embodiment, the desulfurization and dehydration assembly includes a desulfurization and dehydration tower 3 and a porcelain grid 301. There are multiple desulfurization and dehydration towers 3. A first working area 302 and a second working area 303 are provided in each of the multiple desulfurization and dehydration towers 3. The first working area 302 and the second working area 303 are separated by the porcelain grid 301. Specifically, the first working area 302 is the dehydration molecular sieve, and the second working area 303 is the desulfurization molecular sieve. The first working area 302 is located below the second working area 303. The first working area 302 and the second working area 303 cooperate to achieve the simultaneous desulfurization and dehydration; in this embodiment, in one implementation manner, the number of desulfurization and dehydration towers 3 is three, and two of the desulfurization and dehydration towers 3 are used for adsorption, and the other desulfurization and dehydration tower 3 is used for regeneration. Valve assemblies 2 are provided at both ends of the desulfurization and dehydration tower 3, such as Figure 1As shown, the valve assembly 2 includes a first pneumatic valve 201, a second pneumatic valve 202, a third pneumatic valve 203, and a fourth pneumatic valve 204. The first pneumatic valve 201 and the second pneumatic valve 202 are arranged at the upper end of the desulfurization and dehydration tower 3, and the third pneumatic valve 203 and the fourth pneumatic valve 204 are arranged at the lower end of the desulfurization and dehydration tower 3; As Figure 2 shown, a drain port 304 is provided at the bottom end of the desulfurization and dehydration tower 3, a gas inlet 305 is provided on the left side of the bottom end, an air outlet 306 is provided at the top end, a charging port 307 is provided above the right side, and two catalyst discharging ports 308 are provided in the middle of the right side. During the desulfurization and dehydration process, the first pneumatic valve 201 and the fourth pneumatic valve 204 are opened, and the second pneumatic valve 202 and the third pneumatic valve 203 are closed; When the regeneration process is carried out, the second pneumatic valve 202 and the third pneumatic valve 203 are opened, and the first pneumatic valve 201 and the second pneumatic valve 202 are closed.

[0043] In this embodiment, the desulfurization device further includes a boosting assembly; a heat exchange assembly 5, which is connected to the boosting assembly through a flow detection component and a ball valve assembly 12; a cooling assembly, which is connected to the heat exchange assembly 5; One end of the regenerated gas separator 6 is connected to the cooling assembly, and the other end is connected to the regenerated gas compressor unit 4. Specifically, as Figure 1As shown, the pressurizing assembly is the lean gas pressurizing assembly 22. The flow detection components include the first flowmeter 9 and the second flowmeter 10. The ball valve assembly 12 includes the first electric ball valve 1201, the second electric ball valve 1202, the third electric ball valve 1203, and the fourth electric ball valve 1204. The first electric ball valve 1201 and the second electric ball valve 1202 are respectively connected to the second post-filter separator 1302 and the first post-filter separator 1301. The heat exchange assembly 5 includes the first plate-shell heat exchanger 501 and the second plate-shell heat exchanger 502. The cooling assembly is the regenerated gas air cooler 7. After the regenerated lean gas is output from the lean gas pressurizing assembly 22, it sequentially passes through the first flowmeter 9, the third electric ball valve 1203, the first plate-shell heat exchanger 501, and the second plate-shell heat exchanger 502, and exchanges heat with the molecular sieve regenerated gas through the first plate-shell heat exchanger 501 and the second plate-shell heat exchanger 502. After heat exchange, it enters the plate-shell heater 11 and is heated to 280 °C. The heat source heat transfer oil of the plate-shell heater 11 is output from the heat transfer oil delivery system 18 and is transported to the heat transfer oil recovery system 19 after heat exchange. The heated lean gas goes to the regeneration tower to absorb hydrogen sulfide and water. The absorbed regenerated gas is the molecular sieve regenerated gas (rich gas). After the molecular sieve regenerated gas exchanges heat with the lean gas through the first plate-shell heat exchanger 501 and the second plate-shell heat exchanger 502, it enters the regenerated gas air cooler 7 for cooling. The cooled molecular sieve regenerated gas respectively enters the regenerated gas separator 6 for separation. The separated liquid enters the venting and liquid separation tank 8 for further separation, and then the sewage goes to the sewage treatment system 17 for treatment. The gas separated by the regenerated gas separator 6 enters the regenerated gas MDEA desulfurization device 14 after passing through the regenerated gas compressor unit 4, and then the hydrogen sulfide gas is removed through the traditional MDEA solution to become lean gas, and then enters the regeneration process again through the lean gas pressurizing assembly 22. When an accident occurs, the regenerated gas is vented through the first high-pressure venting system 15, and the purified dry gas after desulfurization and dehydration goes to the second high-pressure venting system 21 for venting.

[0044] It should be noted that the third electric ball valve 1203 and the fourth electric ball valve 1204 are linked with the first flowmeter 9 and the second flowmeter 10. When the flow rate is greater than 75×10 4 m 3 / d, the opening of the third electric ball valve 1203 changes. When the flow rate is less than 75×10 4 m 3 / d, the opening of the third electric ball valve 1203 becomes larger. The plate-shell heater 11 can control the heat transfer oil flow rate through the second flowmeter 10, the thermometer, and the fourth electric ball valve 1204. When the temperature of the heated molecular sieve regenerated gas is greater than 280 °C or the heat transfer oil flow rate is large, the opening of the fourth electric ball valve 1204 beside the second flowmeter 10 becomes smaller, and vice versa. There are liquid level control systems on the regenerated gas separator 6 and the venting and liquid separation tank 8. When the liquid level gauge reaches the high liquid level, the opening of the pneumatic valve becomes larger, and when it reaches the low liquid level, the valve opening becomes smaller.

[0045] Example Two:

[0046] In this example, different from Example One, the number of desulfurization and dehydration towers 3 is set to four, two of which are used for desulfurization and dehydration, and the other two are used for regeneration.

[0047] Taking the raw gas of 1800×10 4 m 3 / d entering the first pre-filter separator 101 (one in use and one in reserve) as an example, it enters the 1000×10 4 m 3 / d molecular sieve desulfurization and dehydration tower 3. There are a total of four molecular sieve desulfurization and dehydration towers 3, two of which are used for desulfurization and dehydration, and the other two are used for regeneration; for each set of devices, every 4 hours, the desulfurization and regeneration processes are switched. The raw gas becomes purified dry gas after desulfurization and dehydration and goes to the dry gas metering area 20. The regenerated gas absorbing hydrogen sulfide and water exchanges heat with the lean gas through the first plate heat exchanger 501 and the second plate heat exchanger 502. After heat exchange, the temperature drops from 280°C to 200°C, and then enters the regenerated gas air cooler 7 for cooling. After cooling, the temperature of the molecular sieve regenerated gas drops to 50°C. Subsequently, the molecular sieve regenerated gas enters the regenerated gas separator 6 for separation. The separated gas enters the MDEA solution through the regenerated gas compressor unit 4 for further removal of hydrogen sulfide. The lean gas after removal enters the regeneration system again through the regenerated gas compressor unit 4, is heated to 280°C after being heated by the first plate heat exchanger 501 and the heat-conducting oil, enters from the bottom of the desulfurization and dehydration tower 3, and is output from the top, and becomes the molecular sieve regenerated gas again from the lean gas.

[0048] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A molecular sieve desulfurization device for a large-scale gas volume, characterized in that, Comprising: A first filtration component; A desulfurization and dehydration component, both ends of which are respectively connected to the first filtration component and the second filtration component through valve components, and the end of the second filtration component is connected to a metering component.

2. The desulfurization device according to claim 1, characterized in that, The desulfurization and dehydration component includes a desulfurization and dehydration tower and a porcelain grille. There are multiple desulfurization and dehydration towers, and a first operation area and a second operation area are provided in each of the multiple desulfurization and dehydration towers. The first operation area and the second operation area are separated by the porcelain grille.

3. The desulfurization device according to claim 2, wherein, The first operation area is a dehydration molecular sieve, the second operation area is a desulfurization molecular sieve, and the first operation area is located below the second operation area.

4. The desulfurization device according to claim 2, characterized in that, The number of the desulfurization and dehydration towers is four, three of which are used for adsorption and the other is used for regeneration.

5. The desulfurization device according to claim 1, wherein, The first filtration component includes a first pre-filter separator and a second pre-filter separator, and both the first and second pre-filter separators are connected to one end of the desulfurization and dehydration component.

6. The desulfurization device according to claim 1, characterized in that, The second filtration component includes a first post-filter separator and a second post-filter separator, and both the first and second post-filter separators are connected to the other end of the desulfurization and dehydration component.

7. The desulfurization device according to claim 6, wherein, The first post-filter separator and the second post-filter separator have the same structure.

8. The desulfurization device according to claim 1, characterized in that, Further comprising: A pressurization component; A heat exchange component, which is connected to the pressurization component through a flow detection component and a ball valve component; A cooling component, which is connected to the heat exchange component; A regeneration gas separator, one end of which is connected to the cooling component and the other end is connected to a regeneration gas compressor unit.

9. The desulfurization device according to claim 7, characterized in that, The flow detection component is a flowmeter.

10. The desulfurization device according to claim 7, characterized in that, The heat exchange component is a plate and shell heat exchanger.

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