Natural gas desulfurization device capable of preventing alkali liquor from being solidified
By adding heating pipelines to the alkali pool of the natural gas desulfurization unit, the problem of alkali solidification at low temperatures was solved, the alkali was kept in a liquid state, the desulfurization efficiency and separation effect were improved, and frequent shutdowns were avoided.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-11
- Publication Date
- 2026-03-24
AI Technical Summary
Existing natural gas desulfurization equipment is prone to crystallization and solidification under low temperature conditions, leading to frequent shutdowns for cleaning, reducing desulfurization efficiency and increasing costs.
A heating pipeline is installed in the alkali solution tank of the desulfurization unit, and a heating medium is introduced to heat the alkali solution, keeping the alkali solution in a liquid state at a low temperature to prevent solidification.
It effectively prevents alkali solution from solidifying, improves desulfurization efficiency and separation effect, reduces downtime frequency, and lowers labor and material costs.
Smart Images
Figure CN224030937U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of natural gas purification and treatment equipment, and in particular to a natural gas desulfurization device that prevents alkaline solution from solidifying. Background Technology
[0002] Currently, natural gas desulfurization mainly employs desulfurization towers and related supporting equipment. Desulfurization methods can be divided into dry desulfurization and wet desulfurization. For wet desulfurization, the principle is to transfer H2S from the gas to the liquid phase through gas-liquid two-phase contact, thereby purifying the gas. Commonly used wet desulfurization methods include alkaline absorption and catalytic oxidation. Taking alkaline absorption as an example, the alkaline solution used in this method generally consists of ammonia, sodium carbonate (Na2CO3), sodium hydroxide (NaOH), etc., and can also be alkanolamines, such as monoethanolamine (MEA) and diethanolamine (DEA). These solvents react chemically with H2S in the natural gas to form corresponding salts, thereby removing H2S from the natural gas. Afterwards, the alkaline solution rich in impurities can enter the regeneration tower, where the impurities are desorbed through heating and stripping, thus regenerating the alkaline solution. The regenerated alkaline solution can be recycled after cooling. However, in the low temperatures of winter, the alkaline solution in existing desulfurization equipment is prone to crystallization and solidification inside the equipment, which can clog the pipelines and affect the circulation of alkaline solution and natural gas in the equipment. The existing solution is to stop the operation and replace the alkaline solution when the equipment is clogged, and clean and unclog the blockage points in the equipment. However, this solution leads to frequent shutdowns during operation, reduces desulfurization efficiency, and increases labor and material costs. Utility Model Content
[0003] The purpose of this invention is to overcome the technical problem that existing desulfurization equipment is prone to crystallization and solidification under low temperature conditions, requiring frequent shutdowns for cleaning and reducing operational efficiency, and to provide a natural gas desulfurization device that prevents alkali solution from solidifying.
[0004] This utility model provides a natural gas desulfurization device for preventing alkali solution from solidifying, comprising several desulfurization units connected in series. Each desulfurization unit includes an alkali solution tank and a purification tower. The purification tower is located above and connected to the alkali solution tank. A water pump is also provided on the alkali solution tank. The suction port of the water pump is connected to the alkali solution tank, and the discharge port of the water pump is connected to the purification tower. After being drawn into the alkali solution tank by the water pump, the alkali solution can enter the purification tower for spraying and mixing with the sulfur-containing gas in the purification tower for desulfurization. A heating pipeline is provided in the alkali solution tank, and a heating medium can be introduced into the heating pipeline to heat the alkali solution in the alkali solution tank.
[0005] This application heats the alkali solution in the desulfurization unit by adding a heating pipeline that allows the introduction of a heating medium into the alkali solution tank. This can increase the temperature of the alkali solution under low-temperature conditions in winter, thereby preventing the alkali solution from crystallizing and solidifying. This allows the alkali solution to remain in a liquid state throughout the circulation system of the desulfurization unit, effectively improving the efficiency of desulfurization operations and the effect of desulfurization separation. It also avoids the technical problem of low operating efficiency caused by frequent shutdowns due to manual cleaning.
[0006] Preferably, both ends of the heating pipeline extend outside the alkali solution tank and are connected to a heater, and the heater is equipped with a circulation pump.
[0007] Preferably, the desulfurization unit further includes an inlet pipeline and an outlet pipeline. The inlet pipeline is connected to the side wall of the alkali solution tank and communicates with the alkali solution tank. One end of the outlet pipeline is connected to the top of the purification tower and communicates with the purification tower.
[0008] Preferably, the desulfurization unit includes a first desulfurization unit, a second desulfurization unit, and a third desulfurization unit, wherein the outlet pipeline of the first desulfurization unit is connected to the inlet pipeline of the second desulfurization unit, and the outlet pipeline of the second desulfurization unit is connected to the inlet pipeline of the third desulfurization unit.
[0009] Preferably, the outlet pipeline of the third desulfurization unit is connected to an exhaust pipe.
[0010] Preferably, a first fan is connected between the outlet pipeline of the first desulfurization unit and the inlet pipeline of the second desulfurization unit, a second fan is connected between the outlet pipeline of the second desulfurization unit and the inlet pipeline of the third desulfurization unit, and a third fan is connected between the outlet pipeline of the third desulfurization unit and the exhaust pipe.
[0011] Preferably, a sensor is provided in the exhaust pipe.
[0012] Preferably, the first desulfurization unit includes a branch pipeline, the two ends of which are respectively connected to the inlet pipeline and the outlet pipeline of the first desulfurization unit.
[0013] Preferably, valves are provided on the inlet pipeline, the outlet pipeline, and the branch pipeline.
[0014] Preferably, the purification tower is provided with a plurality of sieve plates spaced apart along the height direction of the purification tower.
[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0016] This invention provides a natural gas desulfurization device to prevent alkali solution from solidifying. By adding a heating pipeline that can carry a heating medium to the alkali solution tank of the desulfurization device, the temperature of the alkali solution in the tank can be increased under low temperature conditions in winter, thereby preventing the alkali solution from crystallizing and solidifying. This allows the alkali solution to remain in a liquid state throughout the circulation system of the desulfurization device, which can effectively improve the efficiency of desulfurization operations and the effect of desulfurization separation. It also avoids the technical problem of low operating efficiency caused by frequent shutdowns due to manual cleaning. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of the natural gas desulfurization device for preventing alkali solution from solidifying according to this utility model.
[0018] Figure 2 This is a schematic diagram showing the locations of the heater, heating pipelines, and alkali tank.
[0019] Marked in the image:
[0020] 1. First desulfurization unit; 2. Second desulfurization unit; 3. Third desulfurization unit; 4. Alkali tank; 5. Purification tower; 51. Screen plate; 6. Water pump; 7. Heating pipeline; 8. Heater; 9. Inlet pipeline; 10. Outlet pipeline; 11. Exhaust pipe; 12. Fan; 13. Branch pipeline; 14. Valve. Detailed Implementation
[0021] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.
[0022] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.
[0023] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.
[0024] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.
[0025] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.
[0026] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.
[0027] Example
[0028] This embodiment provides a natural gas desulfurization device to prevent alkali solution from solidifying.
[0029] Figure 1 This is a schematic diagram of the natural gas desulfurization device for preventing alkali solution from solidifying according to this utility model. Figure 2 This is a schematic diagram showing the locations of the heater, heating pipelines, and alkali tank.
[0030] like Figures 1 to 2As shown in the figure, the natural gas desulfurization device for preventing alkali solidification described in this embodiment may include multiple desulfurization units connected in series. Each desulfurization unit includes an alkali tank 4 and a purification tower 5. The purification tower 5 is positioned above and connected to the alkali tank 4. A water pump 6 is also installed on the alkali tank 4. The suction inlet of the water pump 6 is connected to the alkali tank 4, and the discharge outlet of the water pump 6 is connected to the purification tower 5. The alkali solution in the alkali tank 4 is drawn into the purification tower 5 by the water pump 6 and sprayed thereon, mixing with the sulfur-containing gas in the purification tower 5 for desulfurization. A heating pipeline 7 is installed in the alkali tank 4, through which a heating medium can be introduced to heat the alkali solution in the alkali tank 4. Figure 1 The diagram shows three desulfurization units. Sulfur-containing gas can undergo three-stage desulfurization by sequentially passing through these three units connected in series. Each of the three desulfurization units has an alkali solution tank 4 equipped with a heating pipeline 7. The heating pipeline 7 can be formed into a serpentine coil structure, allowing a longer heating pipeline 7 to be placed in the alkali solution for heat exchange. This increases the contact area between the heating pipeline 7 and the alkali solution, thereby improving the heating efficiency of the alkali solution. The heating medium introduced into the heating pipeline 7 can be water or other liquid or gaseous media. Of course, the number of desulfurization units connected in series in the desulfurization device can be arbitrarily selected as needed, and is not limited to... Figure 1 The present invention does not specifically limit the three shown.
[0031] This application heats the alkali solution in the alkali solution tank 4 of the desulfurization unit by adding a heating pipeline 7 that can carry a heating medium. This can increase the temperature of the alkali solution under low temperature conditions in winter, thereby preventing the alkali solution from crystallizing and solidifying. This allows the alkali solution to remain in a liquid state throughout the circulation system of the desulfurization unit, which can effectively improve the efficiency of desulfurization operation and the effect of desulfurization separation. It also avoids the technical problem of low operation efficiency caused by frequent shutdowns due to manual cleaning.
[0032] In this embodiment, both ends of the heating pipeline 7 extend outside the alkali tank 4 and are connected to the heater 8. The heater 8 is equipped with a circulation pump (not shown in the figure). The heater 8 can be an electric heater, which converts electrical energy into the heat energy of the heating medium. Alternatively, the heating medium can be heated in other ways, such as by burning natural gas, which converts the chemical energy of natural gas into the heat energy of the heating medium. The heating temperature of the heating medium can be selected and adjusted by the heater 8, so that the alkali can be heated to a suitable temperature. The circulation pump can provide circulation power for the heating medium in the heating pipeline 7. It can input the high-temperature heating medium heated in the heater 8 into the heating pipeline 7. After the heating medium exchanges heat with the alkali in the heating pipeline 7, its temperature decreases. The low-temperature heating medium can return to the heater 8 after being output from the heating pipeline 7 to continue heating and raising the temperature, so that the next cycle can be performed.
[0033] In this embodiment, the desulfurization unit may further include an inlet pipeline 9 and an outlet pipeline 10. The inlet pipeline 9 is connected to the side wall of the alkali tank 4 and communicates with the alkali tank 4. One end of the outlet pipeline 10 is connected to the top of the purification tower 5 and communicates with the purification tower 5. Sulfur-containing gas can be introduced into the alkali tank 4 along the inlet pipeline 9, so that the sulfur-containing gas mixes and reacts with the alkali solution in the alkali tank 4 to carry out desulfurization. The sulfur-containing gas can enter the purification tower 5 upwards, and the alkali solution in the alkali tank 4 can be pumped upwards by the water pump 6 into the purification tower 5. Since the outlet pipeline of the water pump 6 is in the purification tower 5, the sulfur-containing gas can enter the purification tower 5 upwards. The connection point on the side wall of the purification tower 5 has a certain height, allowing the alkaline solution sprayed into the purification tower 5 to flow downwards. This causes the alkaline solution and sulfur-containing gas in the purification tower 5 to move in opposite directions, further promoting the mixing of the alkaline solution and sulfur-containing gas in the purification tower 5, thereby improving the efficiency of the desulfurization operation and the effect of desulfurization separation. After desulfurization, the sulfur-containing gas entering the purification tower 5 from the alkaline solution pool 4 continues to rise and can enter the outlet pipeline 10 through the top of the purification tower 5, from the desulfurization unit, and then enter the next stage of the desulfurization unit or be directly discharged from the desulfurization device.
[0034] In this embodiment, the desulfurization unit includes a first desulfurization unit 1, a second desulfurization unit 2, and a third desulfurization unit 3. The outlet pipeline 10 of the first desulfurization unit 1 is connected to the inlet pipeline 9 of the second desulfurization unit 2, and the outlet pipeline 10 of the second desulfurization unit 2 is connected to the inlet pipeline 9 of the third desulfurization unit 3. Figure 1 The diagram shows a three-stage desulfurization unit. After the sulfur-containing gas passes through the first stage of desulfurization in the first desulfurization unit 1, it can enter the second stage of desulfurization in the second desulfurization unit 2. After the second stage of desulfurization in the second desulfurization unit 2, it can enter the third stage of desulfurization in the third desulfurization unit 3. After the three-stage desulfurization, the sulfur content in the gas can be reduced to below the required qualified standard.
[0035] Optionally, the outlet pipeline 10 of the third desulfurization unit 3 is connected to an exhaust pipe 11. The gas discharged from the last stage desulfurization unit can be input from the outlet pipeline 10 of the third desulfurization unit 3 into the exhaust pipe 11, and then input from the exhaust pipe 11 into other equipment for use. Specifically, the outlet pipeline 10 of the third desulfurization unit 3 can be connected to the side wall of the exhaust pipe 11, and the purified gas can be transported along the outlet pipeline 10 and the exhaust pipe 11 of the third desulfurization unit 3.
[0036] In this embodiment, a first fan is connected between the outlet pipeline 10 of the first desulfurization unit 1 and the inlet pipeline 9 of the second desulfurization unit 2; a second fan is connected between the outlet pipeline 10 of the second desulfurization unit 2 and the inlet pipeline 9 of the third desulfurization unit 3; and a third fan is connected between the outlet pipeline 10 of the third desulfurization unit 3 and the exhaust pipe 11. That is, each desulfurization unit has a fan 12 connected to its outlet. The fan 12 can increase the gas delivery pressure in the pipeline when the gas pressure is low, thus playing a secondary pressurization role. Of course, under normal circumstances, the sulfur-containing gas input from the inlet pipeline 9 of the first desulfurization unit 1 already has sufficient pressure. When the pressure is sufficient, the fan 12 can be kept closed. When the pressure in the pipeline is lost, resulting in a pressure drop, the fans 12 at different positions can be turned on for secondary pressurization. Pressurization by the fan 12 can increase the pressure and flow velocity of the gas in the pipeline, thereby improving the efficiency of the desulfurization operation.
[0037] Optionally, a sensor (not shown in the figure) is installed in the exhaust pipe 11. Specifically, the sensor can be a sensor for detecting the sulfur content in the gas. Its specific location can be downstream of the connection between the outlet pipe 10 of the last desulfurization unit and the exhaust pipe 11. That is, after the gas enters the exhaust pipe 11 from the outlet pipe 10 of the last desulfurization unit, it can pass through the sensor. The sensor can detect the sulfur content in the purified gas. If the sulfur content in the purified gas exceeds the standard, it indicates that the sulfur content in the alkali solution is gradually approaching saturation. The desulfurization capacity decreases, resulting in an increase in the residual sulfide content in the gas. At this time, it is necessary to stop the operation and replace the alkali solution in the alkali solution tank 4.
[0038] Optionally, the first desulfurization unit 1 includes a branch pipeline 13, with both ends of the branch pipeline 13 connected to the inlet pipeline 9 and the outlet pipeline 10 of the first desulfurization unit 1, respectively. Connecting the branch pipeline 13 between the inlet pipeline 9 and the outlet pipeline 10 of the first desulfurization unit 1 allows adjustment of the flow path of the sulfur-containing gas, determining whether it flows through the first desulfurization unit 1. Specifically, the inlet of the first desulfurization unit 1 can be closed while the branch pipeline 13 is opened, allowing the sulfur-containing gas to enter the branch pipeline 13 only through the inlet pipeline 9 of the first desulfurization unit 1, and then directly reach the second desulfurization unit 2 through the outlet pipeline 10. In other words, under these conditions, the sulfur-containing gas skips the first desulfurization unit 1, and only undergoes two-stage desulfurization operations in the second and third desulfurization units 2 and 3. This two-stage desulfurization method is typically suitable for gases with low sulfur content, where the sulfur content can meet requirements through only two stages of desulfurization. The desulfurization device can be switched between two-stage and three-stage desulfurization by adjusting the inlet end of the first desulfurization unit 1 and the branch pipeline 13.
[0039] In this embodiment, valves 14 are provided on the inlet pipeline 9, the outlet pipeline 10, and the branch pipeline 13. Specifically, the opening and closing of the inlet pipeline 9 and the outlet pipeline 10 of each desulfurization unit, as well as the branch pipeline 13, can be controlled by valves 14. For example, during the switching process of the two-stage or three-stage desulfurization mode of the above-mentioned desulfurization device, it is necessary to control the opening and closing of the pipeline by adjusting the valves 14 of the inlet pipeline 9 and the branch pipeline 13 of the first desulfurization unit 1. When it is necessary to stop work to replace the alkali solution or for maintenance, it is also necessary to close the valves 14 on each pipeline.
[0040] In this embodiment, a plurality of sieve plates 51 are spaced apart along the height of the purification tower 5. The sieve plates 51 can be formed with a sieve-like structure, which allows the gas and liquid in the purification tower 5 to flow up and down. The alkaline solution can adhere to the sieve plates 51 and fully mix and react with the gas flowing through the sieve plates 51 to achieve desulfurization. The sieve plates 51 can improve the gas-liquid mixing efficiency and desulfurization effect in the purification tower 5. Of course, the number of sieve plates 51 in the purification tower 5 can be arbitrarily selected according to actual needs, and this utility model does not make a specific limitation in this regard.
[0041] In summary, this utility model provides a natural gas desulfurization device to prevent alkali solution from solidifying. By adding a heating pipeline that can carry a heating medium to the alkali solution tank of the desulfurization device, the temperature of the alkali solution in the tank can be increased under low temperature conditions in winter, thereby preventing the alkali solution from crystallizing and solidifying. This allows the alkali solution to remain in a liquid state throughout the circulation system of the desulfurization device, which can effectively improve the efficiency of desulfurization operations and the effect of desulfurization separation. It also avoids the technical problem of low operating efficiency caused by frequent shutdowns due to manual cleaning.
[0042] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A natural gas desulfurization device for preventing alkali solution from solidifying, characterized in that, It includes several desulfurization units, which are connected in series. Each desulfurization unit includes an alkaline solution tank (4) and a purification tower (5). The purification tower (5) is located above the alkaline solution tank (4) and is connected to the alkaline solution tank (4). A water pump (6) is also provided on the alkaline solution tank (4). The suction port of the water pump (6) is connected to the alkaline solution tank (4), and the discharge port of the water pump (6) is connected to the purification tower (5). After the alkaline solution in the alkaline solution tank (4) is drawn in by the water pump (6), it can enter the purification tower (5) for spraying and mix with the sulfur-containing gas in the purification tower (5) for desulfurization. The alkaline solution tank (4) is equipped with a heating pipeline (7), and a heating medium can be introduced into the heating pipeline (7) to heat the alkaline solution in the alkaline solution tank (4).
2. The natural gas desulfurization device for preventing alkali solution solidification according to claim 1, characterized in that, The two ends of the heating pipeline (7) extend out of the alkaline solution tank (4) and are connected to the heater (8), which is equipped with a circulation pump.
3. The natural gas desulfurization device for preventing alkali solution solidification according to claim 1, characterized in that, The desulfurization unit also includes an inlet pipeline (9) and an outlet pipeline (10). The inlet pipeline (9) is connected to the side wall of the alkali tank (4) and communicates with the alkali tank (4). One end of the outlet pipeline (10) is connected to the top of the purification tower (5) and communicates with the purification tower (5).
4. The natural gas desulfurization device for preventing alkali solution solidification according to claim 3, characterized in that, The desulfurization unit includes a first desulfurization unit (1), a second desulfurization unit (2) and a third desulfurization unit (3). The outlet pipeline (10) of the first desulfurization unit (1) is connected to the inlet pipeline (9) of the second desulfurization unit (2), and the outlet pipeline (10) of the second desulfurization unit (2) is connected to the inlet pipeline (9) of the third desulfurization unit (3).
5. The natural gas desulfurization device for preventing alkali solution solidification according to claim 4, characterized in that, The outlet pipeline (10) of the third desulfurization unit (3) is connected to an exhaust pipe (11).
6. The natural gas desulfurization device for preventing alkali solution solidification according to claim 5, characterized in that, A first fan is connected between the outlet pipeline (10) of the first desulfurization unit (1) and the inlet pipeline (9) of the second desulfurization unit (2), a second fan is connected between the outlet pipeline (10) of the second desulfurization unit (2) and the inlet pipeline (9) of the third desulfurization unit (3), and a third fan is connected between the outlet pipeline (10) of the third desulfurization unit (3) and the exhaust pipe (11).
7. The natural gas desulfurization device for preventing alkali solution solidification according to claim 5, characterized in that, A sensor is installed in the exhaust pipe (11).
8. The natural gas desulfurization device for preventing alkali solution solidification according to claim 4, characterized in that, The first desulfurization unit (1) includes a branch pipeline (13), the two ends of which are connected to the inlet pipeline (9) of the first desulfurization unit (1) and the outlet pipeline (10) of the first desulfurization unit (1), respectively.
9. The natural gas desulfurization device for preventing alkali solution solidification according to claim 8, characterized in that, Valves (14) are provided on the inlet pipeline (9), the outlet pipeline (10), and the branch pipeline (13).
10. The natural gas desulfurization device for preventing alkali solidification according to any one of claims 1 to 9, characterized in that, The purification tower (5) is provided with a number of sieve plates (51) spaced apart along the height direction of the purification tower (5).