A desulfurization absorption tower based on a triazine solution

Abstract

This invention discloses a desulfurization absorption tower based on triazine solution, comprising a tower body and a bottom plate. An air inlet is provided on the side wall of the tower body, and a solution injection port is provided at the bottom of the side wall. A drain pipe is connected to the bottom of the side wall. Three distributors are arranged inside the tower body from bottom to top. A centrifugal pump is connected to the bottom plate and communicates with the interior of the tower body, and is fixedly connected to an inlet pipe. The inlet pipe is connected to a four-way connector, and the three branches of the four-way connector are respectively connected to three connecting pipes. The ends of the three connecting pipes pass through the side wall of the tower body and are connected to the three distributors respectively. This invention constructs a three-stage distribution spray and circulation system for triazine solution by setting three distributors inside the tower body and setting a centrifugal pump outside the tower body, which is connected to the three distributors via three connecting pipes on the four-way connector. This allows the triazine solution to form a closed loop of "spraying-reaction-recovery-re-spraying," improving the utilization rate of the triazine solution and the desulfurization efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of desulfurization absorption technology, specifically relating to a desulfurization absorption tower based on triazine solution. Background Technology

[0002] Currently, desulfurization processes for reducing hydrogen sulfide used in oil and gas operations both domestically and internationally include dry, wet, and biological desulfurization methods. Triazine solutions are suitable for removing low concentrations of H2S and hold a place in the liquid desulfurizing agent market. Internationally, direct injection is commonly used, where diluted triazine desulfurizing agents are directly injected into pipelines at suitable locations (such as wellheads or separators). In the mid-1990s, the Gas Research Institute (GRI) developed a direct injection desulfurization process, characterized by directly injecting an aqueous solution of desulfurizing agent into the feed gas pipeline, reducing the H2S content in the feed gas to 6 mg / m³ through a chemical reaction. 3 the following.

[0003] Chinese patent (CN207899220U) discloses a desulfurization absorption tower based on triazine solution, comprising an upper tower body, a middle tower body, and a lower tower body connected sequentially by flanges. Multiple mounting ports are opened on the walls of the upper and lower tower bodies. Differential pressure transmitters and pressure transmitters are installed in the mounting ports of the upper tower body, while temperature transmitters, differential pressure transmitters, and level gauges are installed in the mounting ports of the lower tower body. An inlet is located on the wall of the lower tower body, and an outlet is located at the top of the upper tower body, allowing gas to move upwards within the absorption tower. A desulfurizing agent inlet is located on the wall of the middle tower body, and a desulfurizing agent outlet is located at the bottom of the lower tower body. The triazine solution moves downwards, contacting the gas in a countercurrent manner. The temperature transmitter, pressure transmitter, and differential pressure transmitter within the absorption tower collect and transmit data on temperature, pressure, and differential pressure across the packing material. The absorption tower consists of three tower bodies connected by flanges from top to bottom for easy assembly and disassembly. The lower tower body has a larger diameter than the upper tower body, facilitating the storage of the triazine solution. The current device continuously injects triazine solution into the desulfurization tower through the desulfurizing agent inlet. However, not all of the injected triazine solution reacts with H2S; the unreacted solution falls directly to the bottom of the tower and is discharged with the waste liquid, without being recycled, resulting in a significant waste of chemical reagents. This not only increases operating costs but also wastes recyclable chemical reagents, reducing the overall system's resource utilization efficiency. To address these issues, a desulfurization absorption tower based on triazine solution is proposed. Utility Model Content

[0004] The technical problem this invention aims to solve is to address the shortcomings of the prior art by providing a desulfurization absorption tower based on triazine solution. This desulfurization absorption tower constructs a three-stage distribution spray and circulation system for the triazine solution by installing three distributors inside the tower and a centrifugal pump outside the tower connected to a four-way connector via an inlet pipe. Each connecting pipe on the four-way connector is connected to one of the three distributors. This system allows the triazine solution inside the tower to be distributed to each distributor for spraying and reacting with the H2S-containing gas entering the tower, forming a closed loop of "spraying-reaction-recovery-re-spraying." This improves the utilization rate of the triazine solution, reduces solution waste, and solves the problem of existing devices failing to recycle unreacted triazine solution, resulting in waste.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a desulfurization absorption tower based on triazine solution, characterized in that it includes a tower body and a bottom plate fixedly connected to the bottom of the tower body; An air inlet is provided on the side wall of the tower body, a solution injection port is provided at the bottom of the side wall of the tower body, and a drain pipe is connected to the bottom of the side wall. The tower body is provided with a first distributor, a second distributor and a third distributor in sequence from bottom to top, and the first distributor is located above the air inlet. A centrifugal pump is fixedly connected to the base plate near the tower body. The input end of the centrifugal pump is connected to the lower interior of the tower body through a pipe, and the output end is fixedly connected to the inlet pipe through a flange. The upper end of the inlet pipe is fixedly connected to the main interface of the four-way connector, and the three branch interfaces of the four-way connector are respectively connected to the first connecting pipe, the second connecting pipe, and the third connecting pipe. The end of the first connecting pipe passes through the side wall of the tower body and is connected to the first distributor. The end of the second connecting pipe passes through the side wall of the tower body and is connected to the second distributor. The end of the third connecting pipe passes through the side wall of the tower body and is connected to the third distributor.

[0006] The above-mentioned desulfurization absorption tower based on triazine solution is characterized in that a filter grid is provided below the first distributor inside the tower body, and the position of the filter grid is higher than the position where the input end of the centrifugal pump communicates with the lower interior of the tower body, and a cleaning port is provided on the side wall of the tower body corresponding to the position of the filter grid.

[0007] The above-mentioned desulfurization absorption tower based on triazine solution is characterized in that a level gauge is installed on the tower body and a manhole is provided on the side wall of the tower body.

[0008] The above-mentioned desulfurization absorption tower based on triazine solution is characterized in that an installation frame is fixedly connected above the third distributor inside the tower body, and a demisting layer is installed above the installation frame.

[0009] The above-mentioned desulfurization absorption tower based on triazine solution is characterized in that a conical top cover is provided on the top of the tower body, and an air outlet is provided on the top of the top cover.

[0010] The above-mentioned desulfurization absorption tower based on triazine solution is characterized in that the centrifugal pump is equipped with a flow regulating valve. This utility model has the following advantages compared with the prior art: 1. The desulfurization absorption tower of this utility model constructs a three-stage distribution spray and circulation system for triazine solution by setting a first distributor, a second distributor, and a third distributor inside the tower body, and setting a centrifugal pump outside the tower body and connecting it to a four-way connector via an inlet pipe. The first connecting pipe, the second connecting pipe, and the third connecting pipe on the four-way connector are respectively connected to the first distributor, the second distributor, and the third distributor. This allows the triazine solution inside the tower body to be pumped and distributed to each distributor for spraying and to react with the H2S-containing gas introduced into the tower body for desulfurization. The unreacted triazine solution... After recovery, the solution flows back into the tower for cyclic desulfurization, forming a closed loop of "spraying-reaction-recovery-re-spraying". This maximizes the utilization of the triazine solution, reduces solution waste, improves the utilization rate of the triazine solution, reduces the amount of triazine solution used, lowers the dependence on external raw materials for long-term desulfurization, saves costs, and better controls the stability and desulfurization effect of the triazine solution through recycling, thereby improving the operating efficiency and stability of the desulfurization absorption tower and avoiding problems such as insufficient reaction caused by excessive consumption of triazine solution.

[0011] 2. The desulfurization absorption tower of this utility model has a three-stage distributor structure consisting of a first distributor, a second distributor, and a third distributor inside the tower. This increases the spray points of the triazine solution, achieving 360° full coverage countercurrent contact between the triazine solution and H2S-containing gas. Through staged desulfurization treatment, it helps to remove H2S gas of different concentrations more precisely, ensuring that the desulfurization reaction at each stage achieves the best effect, maximizing the utilization of the contact area between the triazine solution and H2S gas, and improving the desulfurization efficiency.

[0012] 3. The desulfurization absorption tower of this utility model has a reasonable structure and the arrangement of each component is reasonable, making it suitable for industrial applications.

[0013] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0014] Figure 1 This is a front structural schematic diagram of the desulfurization absorption tower based on triazine solution according to this utility model.

[0015] Figure 2 This is a schematic diagram of the back structure of the desulfurization absorption tower based on triazine solution according to this utility model.

[0016] Figure 3 This is a schematic diagram of the internal structure of the desulfurization absorption tower based on triazine solution according to this utility model.

[0017] Figure 4 This is a schematic diagram of the internal and external connection structure of the desulfurization absorption tower based on triazine solution according to this utility model.

[0018] Explanation of reference numerals in the attached figures: Detailed Implementation

[0019] Example 1 like Figures 1-3 As shown, the desulfurization absorption tower based on triazine solution in this embodiment includes a tower body 2 and a bottom plate 1 fixedly connected to the bottom of the tower body 2; An air inlet 4 is provided on the side wall of the tower body 2, a solution injection port 8 is provided at the bottom of the side wall of the tower body 2, and a drain pipe 9 is connected to the bottom of the side wall. The tower body 2 is provided with a first distributor 16, a second distributor 17 and a third distributor 18 arranged sequentially from bottom to top, and the first distributor 16 is located above the air inlet 4. A centrifugal pump 10 is fixedly connected to the base plate 1 near the tower body 2. The input end of the centrifugal pump 10 is connected to the lower interior of the tower body 2 through a pipe, and the output end is fixedly connected to the liquid inlet pipe 11 through a flange. The upper end of the liquid inlet pipe 11 is fixedly connected to the main interface of the four-way connector 12, and the three branch interfaces of the four-way connector 12 are respectively connected to the first connecting pipe 13, the second connecting pipe 14, and the third connecting pipe 15. The end of the first connecting pipe 13 passes through the side wall of the tower body 2 and is connected to the first distributor 16. The end of the second connecting pipe 14 passes through the side wall of the tower body 2 and is connected to the second distributor 17. The end of the third connecting pipe 15 passes through the side wall of the tower body 2 and is connected to the third distributor 18.

[0020] In this embodiment, the desulfurization absorption tower uses tower body 2 as the site for desulfurizing H2S-containing gas with triazine solution. A base plate 1 is fixedly connected to the bottom of tower body 2 to fix and support it, ensuring the stability of the desulfurization process. An air inlet 4 is provided on the side wall of tower body 2 to allow H2S-containing gas to enter. A solution injection port 8 is provided at the bottom of the side wall of tower body 2 to allow triazine solution to enter. A drain pipe 9 is connected to the bottom of the side wall of tower body 2 to discharge waste liquid and impurities after desulfurization. Typically, the air inlet 4 is located at the rear center of tower body 2, while the solution injection port 8 and drain pipe 9 are located at the front of tower body 2 for ease of operation.

[0021] In this embodiment, the desulfurization absorption tower forms a three-stage distributor structure inside the tower body 2, consisting of a first distributor 16, a second distributor 17, and a third distributor 18 arranged sequentially from bottom to top. This structure redistributes the triazine solution introduced into the tower body 2, ensuring it comes into full contact with the H2S-containing gas introduced into the tower body 2, thus achieving gradient desulfurization. Simultaneously, the bottommost first distributor 16 is positioned above the air inlet 4, meaning the three-stage distributor structure is positioned above the air inlet 4. This ensures that the triazine solution flowing out of each distributor can contact the H2S-containing gas introduced into the air inlet 4, guaranteeing smooth gradient desulfurization and improving desulfurization efficiency. In actual production, the three-stage distributor structure is not limited to this specific configuration. Its specific configuration can be adjusted according to the specifications of the tower body 2, the flow rate of the H2S-containing gas, the amount of triazine solution introduced, and the desulfurization requirements to achieve the optimal desulfurization effect.

[0022] As a supporting component of this three-stage distributor structure, in this embodiment, a centrifugal pump 10 is fixedly connected to the base plate 1 near the tower body 2. The input end of the centrifugal pump 10 is connected to the lower interior of the tower body 2 via a pipe, and the output end is fixedly connected to the inlet pipe 11 via a flange. The centrifugal pump 10 pumps the triazine solution sent into the tower body 2 out through the pipe and into the inlet pipe 11. Furthermore, the upper end of the inlet pipe 11 is fixedly connected to the main interface of the four-way connector 12, and the three branch interfaces of the four-way connector 12 are respectively connected to the first connecting pipe 13, the second connecting pipe 14, and the third connecting pipe 15, so that the inlet pipe 11... The triazine solution enters the four-way connector 12 and is then diverted to the first connecting pipe 13, the second connecting pipe 14, and the third connecting pipe 15. By setting the ends of the first connecting pipe 13, the second connecting pipe 14, and the third connecting pipe 15 to pass through the side wall of the tower body 2 and connect to the first distributor 16, the second distributor 17, and the third distributor 18 in the three-stage distributor structure inside the tower body 2, the diverted triazine solution continues to be diverted to the first distributor 16, the second distributor 17, and the third distributor 18, and is sprayed from top to bottom, encountering the H2S-containing gas introduced into the tower body 2 through the air inlet 4, forming a 360° full-coverage countercurrent contact. Specifically, the H2S-containing gas flows from bottom to top. The triazine solution sprayed from the first distributor 16 at the bottom layer first reacts with the high-concentration H2S-containing gas for preliminary desulfurization. Then, the triazine solution sprayed from the second distributor 17 in the middle layer reacts with the further-flowing, pre-desulfurized H2S-containing gas for deeper desulfurization. Finally, the triazine solution sprayed from the third distributor 18 at the top layer reacts with the further-flowing, deeply desulfurized H2S-containing gas for fine purification. Therefore, the three-stage distributor structure in this embodiment achieves uniform distribution of the triazine solution, ensuring that each distributor receives sufficient triazine solution. This significantly increases the contact time and contact area between the triazine solution and the H2S-containing gas, improving the reaction efficiency and greatly enhancing the desulfurization efficiency of the triazine solution. Simultaneously, this staged desulfurization process ensures that each stage of the desulfurization reaction achieves optimal results, facilitating the fine removal of H2S-containing gases of different concentrations and expanding the desulfurization range.

[0023] Meanwhile, in this embodiment, the triazine solution sprayed from the three-stage distributor structure reacts with the H2S-containing gas to generate water-soluble desulfurization reaction products, which fall to the bottom of tower 2 and are discharged uniformly after desulfurization. The unreacted triazine solution also falls to the bottom of tower 2 and accumulates. The unreacted triazine solution accumulated at the bottom of tower 2 is pumped out through a pipeline by centrifugal pump 10 and sent to four-way connector 12. It continues to be distributed to the first distributor 16, the second distributor 17, and the third distributor 18 for spraying, and cyclic desulfurization of the H2S-containing gas, forming a closed loop of "spraying-reaction-recovery-re-spraying". This realizes the utilization of unreacted triazine solution, improves the utilization rate of triazine solution, reduces its waste, avoids the discharge of a large amount of chemical reagents, and improves resource utilization.

[0024] Typically, the first connecting pipe 13, the second connecting pipe 14, and the third connecting pipe 15 are arranged in parallel and in front, middle, and back order around the main interface of the four-way connector 12 to make full use of space, simplify the structure of the desulfurization absorption tower, and improve the aesthetics of the desulfurization absorption tower.

[0025] Typically, the air inlet 4 is connected to the output end of an external exhaust fan via a flange. The exhaust fan allows the H2S-containing gas to smoothly and continuously enter the tower body 2 for staged desulfurization treatment, and the pressurization effect of the exhaust fan can prevent the H2S-containing gas from flowing back.

[0026] like Figure 3 As shown, further, in this embodiment, a filter grid 19 is provided below the first distributor 16 inside the tower body 2, and the position of the filter grid 19 is higher than the position where the input end of the centrifugal pump 10 communicates with the lower interior of the tower body 2. A cleaning port 5 is provided on the side wall of the tower body 2 corresponding to the position of the filter grid 19. Typically, the solution injection port 8 is located below the cleaning port 5, and the drain pipe 9 is located below the solution injection port 8.

[0027] In this embodiment, a filter grid 19 is installed below the first distributor 16, i.e., below the three-stage distributor structure. The filter grid 19 is positioned higher than the connection point between the input end of the centrifugal pump 10 and the lower interior of the tower body 2. The filter grid 19 filters the desulfurization reaction products generated after the triazine solution sprayed from the three-stage distributor structure reacts with H2S-containing gas, separating and removing any precipitates. This prevents precipitates from falling to the bottom of the tower body 2 and being pumped out by the centrifugal pump 10, thus avoiding blockage of the distributors in the three-stage distributor structure and ensuring the normal operation of the desulfurization absorption tower. Typically, the filter grid 19 is made of 316L stainless steel. Simultaneously, this embodiment provides a cleaning port 5 on the side wall of the tower body 2 corresponding to the location of the filter grid 19. This facilitates the cleaning of the precipitates separated and intercepted on the filter grid 19, ensuring the filtration effect of the filter grid 19 and extending the service life of the desulfurization absorption tower.

[0028] like Figure 1 and Figure 4 As shown, in this embodiment, a level gauge 7 is installed on the tower body 2, and a manhole 6 is provided on the side wall of the tower body 2. Typically, the manhole 6 is positioned higher than the filter grid 19 and also higher than the level gauge 7 to prevent the solution at the bottom of the tower from flowing out after the manhole 6 is opened. Both the manhole 6 and the level gauge 7 can be located on the right side of the tower body 2.

[0029] In this embodiment, a level gauge 7 is installed on the tower body 2 to detect and display the solution level inside the tower body 2 in real time, providing operators with accurate level information. When the solution level is lower than the set value and affects the desulfurization reaction, fresh triazine solution is added through the solution injection port 8 to ensure the continuous and normal operation of the desulfurization reaction in the desulfurization absorption tower. Simultaneously, a manhole 6 is provided on the side wall of the tower body 2 to facilitate operators entering the interior of the tower body 2 for inspection, maintenance, and other work, ensuring the safe operation of the sulfur absorption tower.

[0030] like Figure 3 As shown, further, in this embodiment, a mounting bracket 20 is fixedly connected above the third distributor 18 inside the tower body 2, and a demisting layer 21 is installed above the mounting bracket 20. Typically, the demisting layer 21 is made of polypropylene wire mesh with a specific surface area of ​​500 m². 2 / m 3 above.

[0031] In this embodiment, a mounting frame 20 is fixedly connected above the third distributor 18, i.e., above the three-stage distributor structure, and a demister layer 21 is installed above the mounting frame 20. When the desulfurized H2S-containing gas diffuses upward, it passes through the demister layer 21. The demister layer 21 separates and recovers the small amount of triazine solution droplets carried in the desulfurized H2S-containing gas, allowing them to flow back to the bottom of the tower body 2 for recycling and to continue participating in the spraying and desulfurization reaction process. This further improves the utilization rate of the triazine solution, reduces its waste, and simultaneously achieves demisting and purification of the desulfurized H2S-containing gas.

[0032] like Figure 2 and Figure 4 As shown, in this embodiment, a conical top cover 3 is provided above the tower body 2, and an outlet 22 is provided above the top cover 3. In this embodiment, by providing a conical top cover 3 above the tower body 2 and opening an outlet 22 above the top cover 3, the desulfurized H2S-containing gas is collected at the top cover 3 and smoothly discharged through the outlet 22, either entering subsequent processing stages or being released into the atmosphere. The conical structure of the top cover 3 reduces gas turbulence, which helps improve exhaust efficiency.

[0033] Furthermore, in this embodiment, a flow regulating valve is provided in the centrifugal pump 10. This embodiment uses a flow regulating valve in the centrifugal pump 10 to adjust the circulating flow rate of the triazine solution according to the inlet flow rate of H2S-containing gas in the desulfurization absorption tower, typically controlling it at a gas-liquid ratio of 1000:1 to 1500:1, ensuring efficient utilization of the triazine solution.

[0034] The process of using the desulfurization absorption tower based on triazine solution of this utility model is as follows: Gas containing H2S is introduced into the tower body 2 through the inlet 4. Triazine solution is introduced into the bottom of the tower body 2 through the solution injection port 8. The centrifugal pump 10 is started, causing the triazine solution to flow through the pipeline into the inlet pipe 11. It is then diverted through the four-way connector 12 to the first connecting pipe 13, the second connecting pipe 14, and the third connecting pipe 15, and further diverted to the first distributor 16, the second distributor 17, and the third distributor 18. These distributors spray the gas from top to bottom, contacting it counter-currently with the H2S-containing gas diffusing from bottom to top. The H2S-containing gas first passes through the first distributor 16 and reacts with the sprayed triazine solution for preliminary desulfurization. Then it passes through the second distributor 17 and reacts with the sprayed triazine solution for deep desulfurization. Finally, it passes through the third distributor 18 and reacts with the sprayed triazine solution for fine purification. Finally, it enters the demister layer 21 where a small amount of triazine carried by the gas is intercepted and removed. After the triazine solution droplets are collected in the top cover 3, they are smoothly discharged through the outlet 22. The small amount of triazine solution droplets that are intercepted flow back down along the surface of the demister layer 21 to the bottom of the tower body 2. The desulfurization reaction products generated after the triazine solution and H2S-containing gas undergo desulfurization reactions at each stage fall onto the filter grid 19 under gravity for filtration, separating and removing the precipitates contained therein. The cleaning port 5 can be opened to periodically clean the precipitates separated in the filter grid 19. The filtered solution continues to fall to the bottom of the tower body 2. The unreacted triazine solution is pumped out by the centrifugal pump 10 to the distributors at each stage to participate in the spraying and desulfurization reaction process again. During the entire desulfurization process, when the solution level in the tower body 2 is lower than the set value, fresh triazine solution is added to the tower body 2 through the solution injection port 8. After the desulfurization work in the tower body 2 is completed, the waste liquid accumulated at the bottom of the tower body 2 is periodically discharged through the drain pipe 9 for subsequent sulfur and triazine alkane recovery.

[0035] The above description is merely a preferred embodiment of this utility model and does not constitute any limitation on this utility model. Any simple modifications, alterations, and equivalent changes made to the above embodiments based on the technical essence of this utility model shall still fall within the protection scope of this utility model.

Claims

1. A desulfurization absorption tower based on triazine solution, characterized in that, Includes the tower body (2) and the base plate (1) fixedly connected to the bottom of the tower body (2); An air inlet (4) is provided on the side wall of the tower body (2), a solution injection port (8) is provided at the bottom of the side wall of the tower body (2), and a drain pipe (9) is connected to the bottom of the side wall. The tower body (2) is provided with a first distributor (16), a second distributor (17) and a third distributor (18) from bottom to top inside, and the first distributor (16) is located above the air inlet (4); A centrifugal pump (10) is fixedly connected to the base plate (1) near the tower body (2). The input end of the centrifugal pump (10) is connected to the lower interior of the tower body (2) through a pipe, and the output end is fixedly connected to the liquid inlet pipe (11) through a flange. The upper end of the liquid inlet pipe (11) is fixedly connected to the main interface of the four-way connector (12), and the three branch interfaces of the four-way connector (12) are respectively connected to the first connecting pipe (13), the second connecting pipe (14), and the third connecting pipe (15). The end of the first connecting pipe (13) passes through the side wall of the tower body (2) and is connected to the first distributor (16). The end of the second connecting pipe (14) passes through the side wall of the tower body (2) and is connected to the second distributor (17). The end of the third connecting pipe (15) passes through the side wall of the tower body (2) and is connected to the third distributor (18).

2. The desulfurization absorption tower based on triazine solution according to claim 1, characterized in that, A filter grid (19) is provided below the first distributor (16) inside the tower body (2), and the position of the filter grid (19) is higher than the position where the input end of the centrifugal pump (10) communicates with the lower interior of the tower body (2). A cleaning port (5) is provided on the side wall of the tower body (2) at the position corresponding to the filter grid (19).

3. The desulfurization absorption tower based on triazine solution according to claim 1, characterized in that, A level gauge (7) is installed on the tower body (2), and a manhole (6) is opened on the side wall of the tower body (2).

4. A desulfurization absorption tower based on triazine solution according to claim 1, characterized in that, An installation frame (20) is fixedly connected above the third distributor (18) inside the tower body (2), and a demisting layer (21) is installed above the installation frame (20).

5. A desulfurization absorption tower based on triazine solution according to claim 1, characterized in that, A conical top cover (3) is provided on the top of the tower body (2), and an air outlet (22) is provided on the top of the top cover (3).

6. A desulfurization absorption tower based on triazine solution according to claim 1, characterized in that, The centrifugal pump (10) is equipped with a flow regulating valve.

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