A natural gas methanol production raw material gas pretreatment device with high desulfurization efficiency

Abstract

The utility model relates to a kind of raw gas pretreatment device of high-efficiency desulfurization for natural gas methanol, applied to the field of chemical equipment, including premixing component, the right side of premixing component is fixedly connected with first-stage desulfurization tower component, the right side of first-stage desulfurization tower component is fixedly connected with second-stage desulfurization tower component, strengthening component is all arranged in first-stage desulfurization tower component and second-stage desulfurization tower component, premixing component includes premixing tank body, the upper end left side of premixing tank body is fixedly connected with raw gas inlet pipe, the upper end right side of premixing tank body is fixedly connected with hydrogen inlet pipe, the synergistic effect of the present scheme, first-stage desulfurization tower component and second-stage desulfurization tower component, realize the deep desulfurization treatment of raw gas, raw gas and hydrogen are fully mixed in premixing component, in turn enter first-stage desulfurization tower component and second-stage desulfurization tower component and carry out desulfurization reaction, strengthening component is arranged in two-stage desulfurization tower to improve desulfurization efficiency.

Description

Technical Field

[0001] This utility model relates to a raw material gas pretreatment device, and in particular to a high-efficiency desulfurization raw material gas pretreatment device for natural gas to methanol production, which is applied in the field of chemical equipment. Background Technology

[0002] In the industrial production process of methanol from natural gas, desulfurization of the feed gas is a crucial preliminary step. Sulfur compounds such as hydrogen sulfide, mercaptans, and thioethers contained in the feed gas, even in extremely low concentrations, can cause catalyst poisoning during the methanol synthesis stage, leading to a significant decrease in catalyst activity and selectivity, a marked shortening of its lifespan, and a reduction in the quality and production efficiency of the methanol product.

[0003] Chinese patent CN209836109U discloses a natural gas desulfurization system, belonging to the field of desulfurization technology. The natural gas desulfurization system includes an MDEA desulfurization unit and a TSA desulfurization unit. The desulfurization unit has an inlet and an outlet, allowing finely desulfurized natural gas to exit from a first outlet and first regenerated gas to exit from a second outlet. The first regenerated gas can remove sulfides adsorbed by the TSA desulfurization unit and exit from the second outlet. The finely desulfurized natural gas obtained after treatment by the MDEA and TSA desulfurization units meets higher usage requirements.

[0004] Chinese Patent CN202576374U discloses a natural gas desulfurization and liquid removal device, belonging to the field of chemical technology. The device includes a natural gas transmission pipeline, a gas-liquid separator, and desulfurization equipment. This invention returns the desulfurized natural gas to the lower cavity below the gas-liquid separator, and uses a large flow of natural gas to atomize the liquid, which is then returned to the main natural gas pipeline along with the desulfurized gas. When using the desulfurization device described in this invention for natural gas desulfurization, it has the advantages of low cost, environmentally friendly desulfurization process, and resource conservation.

[0005] However, traditional desulfurization devices suffer from uneven gas-liquid distribution, which prevents the desulfurizing agent from fully contacting the raw gas, making it difficult to meet the requirements for deep desulfurization. The mixing effect between the raw gas and hydrogen is poor, and the hydrodesulfurization reaction is incomplete. In particular, the removal efficiency of organic sulfur is low, making it difficult to stably remove sulfur from the raw gas to the level required by the process. Utility Model Content

[0006] The technical problem to be solved by this utility model in view of the above-mentioned prior art is that the gas-liquid distribution of traditional desulfurization devices is uneven, which makes it difficult for the desulfurizing agent to fully contact the raw gas, making it difficult to meet the requirements of deep desulfurization. The mixing effect of raw gas and hydrogen is not good, and the hydrodesulfurization reaction is insufficient. In particular, the removal efficiency of organic sulfur is low, and it is difficult to stably remove sulfur from the raw gas to the level required by the process.

[0007] To address the aforementioned problems, this utility model provides a high-efficiency desulfurization pretreatment device for raw gas used in methanol production from natural gas, comprising a premixing component, a primary desulfurization tower component fixedly connected to the right side of the premixing component, a secondary desulfurization tower component fixedly connected to the right side of the primary desulfurization tower component, and both the primary and secondary desulfurization tower components being equipped with enhancement components.

[0008] The premixing assembly includes a premixing tank. A raw material gas inlet pipe is fixedly connected to the upper left side of the premixing tank, and a hydrogen inlet pipe is fixedly connected to the upper right side of the premixing tank. A gas distributor is fixedly connected to the upper side of the inner end of the premixing tank. A motor is fixedly connected to the upper end of the premixing tank. The output end of the motor is connected to a stirring shaft. Stirring blades are symmetrically fixedly connected to the lower left and right sides of the stirring shaft.

[0009] The primary desulfurization tower assembly includes a primary desulfurization tower tank. A first gas redistributor is fixedly connected to the middle of the inner end of the primary desulfurization tower tank. Multiple first guide fan blades arranged in a ring-shaped spiral are fixedly connected to the inner end of the first gas redistributor. First desulfurizing agent packing layers are fixedly connected to both the upper and lower sides of the inner end of the primary desulfurization tower tank. The two first desulfurizing agent packing layers are located on the upper and lower sides of the first gas redistributor, respectively. A first drain port is fixedly connected to the lower right side of the primary desulfurization tower tank.

[0010] The secondary desulfurization tower assembly includes a secondary desulfurization tower. A second gas redistributor is fixedly connected to the middle of the inner end of the secondary desulfurization tower. Multiple second guide fan blades arranged in a ring-shaped spiral are fixedly connected to the inner end of the second gas redistributor. Second desulfurizing agent packing layers are fixedly connected to both the upper and lower sides of the inner end of the secondary desulfurization tower. The two second desulfurizing agent packing layers are located on the upper and lower sides of the second gas redistributor, respectively. A second drain port is fixedly connected to the lower right side of the secondary desulfurization tower, and a gas outlet is fixedly connected to the upper end of the secondary desulfurization tower.

[0011] In the aforementioned high-efficiency desulfurization natural gas to methanol feedstock pretreatment unit, this scheme achieves deep desulfurization of the feedstock gas through the synergistic effect of the premixing component, the primary desulfurization tower component, and the secondary desulfurization tower component. After the feedstock gas and hydrogen are fully mixed in the premixing component, they enter the primary desulfurization tower component and the secondary desulfurization tower component in sequence for desulfurization reaction. Both desulfurization towers are equipped with enhancement components to improve desulfurization efficiency.

[0012] As a further improvement of this application, the premixing tank, the primary desulfurization tower tank, and the secondary desulfurization tower are respectively fixedly connected by connecting pipes, and the left and right ends of the premixing tank are symmetrically fixedly connected by supports.

[0013] As a further improvement of this application, a stirring groove hole is provided in the middle of the gas distributor, and multiple ventilation grooves are provided on the surface of the gas distributor.

[0014] As a further improvement of this application, the outer side of the primary desulfurization tower tank is fixedly connected with multiple first manholes, and the outer end of the secondary desulfurization tower is fixedly connected with multiple second manholes.

[0015] As another improvement of this application, the strengthening component includes a plurality of resonant cavity body grooves respectively disposed on the surfaces of the first guide fan blade and the second guide fan blade.

[0016] As a further improvement to this application, a resonant cavity is fixedly connected to the inner end of the resonant cavity main body groove, and a short tube neck is fixedly connected to the upper end of the resonant cavity.

[0017] As a further improvement to this application, a cylindrical cavity is fixedly connected to the lower end of the short pipe neck, and ultrasonic generators are fixedly connected to the upper inner walls of the primary desulfurization tower and the secondary desulfurization tower, respectively.

[0018] In summary, this solution achieves deep desulfurization of the raw gas through the synergistic effect of the premixing component, the primary desulfurization tower component, and the secondary desulfurization tower component. After the raw gas and hydrogen are fully mixed in the premixing component, they sequentially enter the primary and secondary desulfurization tower components for desulfurization reaction. In the premixing component, after the raw gas and hydrogen are injected through the raw gas inlet pipe and the hydrogen inlet pipe, the strong stirring of the gas distributor's venting groove and stirring blades improves the uniformity of gas mixing. In the primary and secondary desulfurization tower components, the annular spiral design of the first and second guide fan blades, combined with the first and second gas redistributors, achieves uniform gas distribution within the tower. Furthermore, both desulfurization towers are equipped with enhancement components to improve desulfurization efficiency. Attached Figure Description

[0019] Figure 1 This is an isometric view of the processing apparatus according to the first embodiment of this application;

[0020] Figure 2 This is a diagram showing the internal structure of the processing apparatus according to the first and second embodiments of this application.

[0021] Figure 3 This is a structural diagram of the gas distributor according to the first embodiment of this application;

[0022] Figure 4 This is a structural diagram of the first gas redistributor according to the first embodiment of this application;

[0023] Figure 5 This is a structural diagram of an ultrasonic generator according to the second embodiment of this application;

[0024] Figure 6 This is a structural diagram of the enhanced component according to the second embodiment of this application;

[0025] Figure 7This is a side cross-sectional view of the resonant cavity according to the second embodiment of this application.

[0026] Explanation of the labels in the diagram:

[0027] 1. Premixing assembly; 100. Premixing tank; 101. Raw material gas inlet pipe; 102. Hydrogen inlet pipe; 103. Gas distributor; 1030. Ventilation trough; 1031. Stirring tank hole; 104. Motor; 105. Stirring main shaft; 106. Stirring blades; 107. Support; 108. Connecting pipe; 2. Primary desulfurization tower assembly; 200. Primary desulfurization tower tank; 202. First gas redistributor; 203. First guide fan blades; 204. First desulfurizing agent filler 1. Material layer; 205. First manhole; 206. First drain outlet; 3. Secondary desulfurization tower assembly; 300. Secondary desulfurization tower; 302. Second gas redistributor; 303. Second guide fan blade; 304. Second desulfurizing agent packing layer; 305. Second manhole; 306. Second drain outlet; 307. Gas outlet; 4. Reinforcement assembly; 400. Resonance cavity main body tank; 401. Resonance cavity; 402. Cylindrical cavity; 403. Short pipe neck; 404. Ultrasonic generator. Detailed Implementation

[0028] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0029] First implementation method:

[0030] Figures 1-4 A high-efficiency desulfurization natural gas-to-methanol feedstock pretreatment device is shown, including a premixing component 1, a primary desulfurization tower component 2 fixedly connected to the right side of the premixing component 1, a secondary desulfurization tower component 3 fixedly connected to the right side of the primary desulfurization tower component 2, and an enhancement component 4 provided in both the primary desulfurization tower component 2 and the secondary desulfurization tower component 3.

[0031] The premixing assembly 1 includes a premixing tank 100. A raw material gas inlet pipe 101 is fixedly connected to the upper left side of the premixing tank 100, and a hydrogen inlet pipe 102 is fixedly connected to the upper right side of the premixing tank 100. A gas distributor 103 is fixedly connected to the upper side of the inner end of the premixing tank 100. A motor 104 is fixedly connected to the upper end of the premixing tank 100. The output end of the motor 104 is connected to a stirring shaft 105. Stirring blades 106 are symmetrically fixedly connected to the lower left and right sides of the stirring shaft 105.

[0032] The primary desulfurization tower assembly 2 includes a primary desulfurization tower tank 200. A first gas redistributor 202 is fixedly connected to the middle of the inner end of the primary desulfurization tower tank 200. Multiple first guide fan blades 203 arranged in a ring spiral are fixedly connected to the inner end of the first gas redistributor 202. A first desulfurizing agent packing layer 204 is fixedly connected to both the upper and lower sides of the inner end of the primary desulfurization tower tank 200. The two first desulfurizing agent packing layers 204 are located on the upper and lower sides of the first gas redistributor 202, respectively. A first drain port 206 is fixedly connected to the lower right side of the primary desulfurization tower tank 200.

[0033] The secondary desulfurization tower assembly 3 includes a secondary desulfurization tower 300. A second gas redistributor 302 is fixedly connected to the middle of the inner end of the secondary desulfurization tower 300. Multiple second guide fan blades 303 arranged in a ring-shaped spiral are fixedly connected to the inner end of the second gas redistributor 302. Second desulfurizing agent packing layers 304 are fixedly connected to both the upper and lower sides of the inner end of the secondary desulfurization tower 300. The two second desulfurizing agent packing layers 304 are located on the upper and lower sides of the second gas redistributor 302, respectively. A second drain port 306 is fixedly connected to the lower right side of the secondary desulfurization tower 300. A gas outlet 307 is fixedly connected to the upper end of the secondary desulfurization tower 300.

[0034] A connecting pipe 108 is fixedly connected between the premixing tank 100, the primary desulfurization tower tank 200, and the secondary desulfurization tower 300. Supports 107 are symmetrically fixedly connected to the left and right ends of the premixing tank 100. A stirring groove hole 1031 is opened in the middle of the gas distributor 103. Multiple ventilation grooves 1030 are opened on the surface of the gas distributor 103. Multiple first manholes 205 are fixedly connected to the outside of the primary desulfurization tower tank 200. Multiple second manholes 305 are fixedly connected to the outside of the secondary desulfurization tower 300.

[0035] Figures 1-4 This scheme demonstrates that the premixing component 1, the primary desulfurization tower component 2, and the secondary desulfurization tower component 3 work together to achieve deep desulfurization of the raw gas. After the raw gas and hydrogen are fully mixed in the premixing component 1, they enter the primary desulfurization tower component 2 and the secondary desulfurization tower component 3 in sequence for desulfurization reaction. Both desulfurization towers are equipped with enhancement components 4 to improve desulfurization efficiency. The entire process is connected to each component through connecting pipe 108.

[0036] Raw material gas enters the premixing tank 100 through raw material gas inlet pipe 101, and hydrogen is injected simultaneously through hydrogen inlet pipe 102. The two gases first come into contact with the gas distributor 103. The ventilation grooves 1030 on the surface of the distributor disperse the gas into fine airflow, initially improving the mixing uniformity. The motor 104 drives the stirring shaft 105 to rotate. The motor 104 is a Y2-132M-4 three-phase asynchronous motor, which drives the stirring blades 106 to strongly stir the gas. During the stirring process, the gas forms a circulating flow path through the stirring groove holes 1031 in the middle of the gas distributor 103, further enhancing the mixing effect. The support 107 provides stable support for the premixing tank 100.

[0037] After the mixed gas enters the primary desulfurization tower tank 200 through the connecting pipe 108, it first passes through the first gas redistributor 202. The first guide fan blades 203 in the distributor are arranged in a ring spiral, so that the gas forms a rotating and rising flow state, ensuring that the gas is evenly distributed on the cross-section of the tower. The gas undergoes a desulfurization reaction in the first desulfurizing agent packing layer 204. One layer is set on each of the upper and lower sides of the packing layer to extend the contact path between the gas and the desulfurizing agent. The liquid impurities generated by the reaction are discharged outside the tower through the first drain port 206. The first manhole 205 is used for equipment maintenance and packing replacement.

[0038] The gas after primary desulfurization enters the secondary desulfurization tower 300 through the connecting pipe 108. Under the action of the second gas redistributor 302 and the second guide fan blade 303, it is evenly distributed again. The second desulfurizing agent packing layer 304 performs deep desulfurization to further reduce the sulfur content. The liquid impurities generated by the reaction are discharged through the second drain port 306. The clean gas after desulfurization is output to the subsequent process through the gas outlet 307. The second manhole 305 is used for equipment maintenance inside the tower.

[0039] Second implementation method:

[0040] Figure 2 , Figures 5-6 A high-efficiency desulfurization natural gas-to-methanol feedstock pretreatment device is shown. The enhancement component 4 includes multiple resonant cavity main body grooves 400 respectively disposed on the surface of the first guide fan blade 203 and the second guide fan blade 303. A resonant cavity 401 is fixedly connected to the inner end of the resonant cavity main body groove 400. A short pipe neck 403 is fixedly connected to the upper end of the resonant cavity 401. A cylindrical cavity 402 is fixedly connected to the lower end of the short pipe neck 403. An ultrasonic generator 404 is fixedly connected to the upper inner wall of the primary desulfurization tower tank 200 and the secondary desulfurization tower 300 respectively.

[0041] Figure 2 , Figures 5-6This illustrates that due to the operation of some equipment in harsh and extreme environments such as cold or high temperatures, changes in the physical properties of the gas can affect the desulfurization reaction. In low-temperature environments, gas viscosity increases and diffusion rate decreases, while in high-temperature environments, the activity of the desulfurizing agent may decrease. In such cases, the synergistic effect of the strengthening component 4, the primary desulfurization tower component 2, and the secondary desulfurization tower component 3 can be selected. For example, the resonant cavity main groove 400 on the surface of the first guide fan blade 203 is embedded with a resonant cavity 401 made of 316L stainless steel. Its short pipe neck 403 and cylindrical cavity 402 form a Helmholtz symbol. The Holtz resonance structure generates sound waves of a specific frequency under the excitation of gas flow. The ultrasonic waves emitted by the ultrasonic generator 404 are coupled with the resonant sound waves and superimposed in the space inside the tower. The ultrasonic generator 404 is model HS-2000, which forms an enhanced sound field. This sound field breaks the boundary layer between the gas and the desulfurizing agent surface through the acoustic flow effect and cavitation effect, accelerating the decomposition and diffusion of sulfur compounds. In high-temperature environments, the acoustic flow effect can accelerate the heat exchange between the gas and the desulfurizing agent surface, preventing the desulfurizing agent from being deactivated due to local overheating, and effectively ensuring the stable operation of this equipment under extreme environments.

[0042] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this utility model.

Claims

1. A high-efficiency desulfurization natural gas-to-methanol feedstock pretreatment device, characterized in that: It includes a premixing component (1), a primary desulfurization tower component (2) is fixedly connected to the right side of the premixing component (1), a secondary desulfurization tower component (3) is fixedly connected to the right side of the primary desulfurization tower component (2), and a reinforcing component (4) is provided in both the primary desulfurization tower component (2) and the secondary desulfurization tower component (3). The premixing component (1) includes a premixing tank (100), a raw material gas inlet pipe (101) is fixedly connected to the upper left side of the premixing tank (100), a hydrogen inlet pipe (102) is fixedly connected to the upper right side of the premixing tank (100), a gas distributor (103) is fixedly connected to the upper side of the inner end of the premixing tank (100), a motor (104) is fixedly connected to the upper end of the premixing tank (100), the output end of the motor (104) is connected to a stirring spindle (105), and stirring blades (106) are symmetrically fixedly connected to the lower left and right sides of the stirring spindle (105). The primary desulfurization tower assembly (2) includes a primary desulfurization tower tank (200). A first gas redistributor (202) is fixedly connected to the middle of the inner end of the primary desulfurization tower tank (200). A plurality of first guide fan blades (203) arranged in a ring spiral are fixedly connected to the inner end of the first gas redistributor (202). A first desulfurizing agent packing layer (204) is fixedly connected to both the upper and lower sides of the inner end of the primary desulfurization tower tank (200). The two first desulfurizing agent packing layers (204) are located on the upper and lower sides of the first gas redistributor (202) respectively. A first drain port (206) is fixedly connected to the lower right side of the primary desulfurization tower tank (200). The secondary desulfurization tower assembly (3) includes a secondary desulfurization tower (300). A second gas redistributor (302) is fixedly connected to the middle of the inner end of the secondary desulfurization tower (300). A plurality of second guide fan blades (303) arranged in a ring spiral are fixedly connected to the inner end of the second gas redistributor (302). A second desulfurizing agent packing layer (304) is fixedly connected to both the upper and lower sides of the inner end of the secondary desulfurization tower (300). The two second desulfurizing agent packing layers (304) are located on the upper and lower sides of the second gas redistributor (302), respectively. A second drain port (306) is fixedly connected to the lower right side of the secondary desulfurization tower (300). A gas outlet (307) is fixedly connected to the upper end of the secondary desulfurization tower (300).

2. The high-efficiency desulfurization natural gas-to-methanol feedstock pretreatment device according to claim 1, characterized in that: The premixing tank (100), the primary desulfurization tower tank (200), and the secondary desulfurization tower (300) are respectively fixedly connected by connecting pipes (108), and the left and right ends of the premixing tank (100) are symmetrically fixedly connected by supports (107).

3. The high-efficiency desulfurization natural gas-to-methanol feedstock pretreatment device according to claim 1, characterized in that: The gas distributor (103) has a stirring groove hole (1031) in the middle and a plurality of ventilation grooves (1030) on the surface of the gas distributor (103).

4. The high-efficiency desulfurization natural gas-to-methanol feedstock pretreatment device according to claim 1, characterized in that: The outer side of the primary desulfurization tower tank (200) is fixedly connected with multiple first manholes (205), and the outer end of the secondary desulfurization tower (300) is fixedly connected with multiple second manholes (305).

5. The high-efficiency desulfurization natural gas-to-methanol feedstock pretreatment device according to claim 1, characterized in that: The strengthening component (4) includes a plurality of resonant cavity main body grooves (400) respectively disposed on the surface of the first guide fan blade (203) and the second guide fan blade (303).

6. The high-efficiency desulfurization natural gas-to-methanol feedstock pretreatment device according to claim 5, characterized in that: The inner end of the main groove (400) of the resonant cavity is fixedly connected to a resonant cavity (401), and the upper end of the resonant cavity (401) is fixedly connected to a short tube neck (403).

7. The high-efficiency desulfurization natural gas-to-methanol feedstock pretreatment device according to claim 6, characterized in that: A cylindrical cavity (402) is fixedly connected to the lower end of the short pipe neck (403), and an ultrasonic generator (404) is fixedly connected to the upper inner wall of the primary desulfurization tower tank (200) and the secondary desulfurization tower (300).

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