Desulfurization equipment and utilization process for sulfur-containing natural gas

Abstract

This invention relates to the field of natural gas purification technology, specifically to desulfurization equipment and utilization process for sulfur-containing natural gas. The desulfurization equipment for sulfur-containing natural gas includes a sulfur-containing natural gas pipeline and a purified gas pipeline. A vertical desulfurization reactor is installed on the sulfur-containing natural gas pipeline. A first inlet is located at the lower part of the vertical desulfurization reactor, with one end of the first inlet pointing upwards, and the other end of the first inlet connected to the sulfur-containing natural gas pipeline. A second inlet is provided on the vertical desulfurization reactor, connected to a filling pipeline. The filling pipeline is also connected to a filling tank. A filling pump is installed on the filling pipeline. A first outlet, connected to the purified gas pipeline, is located at the upper end of the vertical desulfurization reactor. This invention also discloses a process for purifying sulfur-containing natural gas using this desulfurization equipment. This invention can reduce the desulfurization cost of natural gas, ensuring that the purified natural gas meets standards while achieving significant overall benefits.

Description

[0001] This invention is a divisional application based on the application filed on March 28, 2024, with application number 202410366802.8 and entitled "Desulfurization equipment and utilization process for sulfur-containing natural gas". Technical Field

[0002] This invention relates to the field of natural gas purification technology, specifically to desulfurization equipment and utilization processes for sulfur-containing natural gas. Background Technology

[0003] Natural gas flowing from natural gas wells often contains acidic components such as hydrogen sulfide, carbon dioxide, and organic sulfur compounds, which can not only corrode metal materials but also cause human poisoning and emissions problems caused by sulfur dioxide as a combustion product.

[0004] Currently, the main method for desulfurization of small-scale natural gas is to directly spray desulfurizing agents into the gas pipeline. The commonly used desulfurizing agent is triazine desulfurizing agent, which involves setting up multiple spray points on the pipeline and spraying the agent into the pipeline in an atomized manner to achieve desulfurization of natural gas.

[0005] However, referring to Chinese patent CN117467485A and its appendix Figure 1 The existing spraying method has the following drawbacks: 1. Small gas-liquid contact area and poor desulfurization efficiency; 2. A large amount of fresh reagent that does not participate in the reaction is wasted, resulting in a large consumption of desulfurization reagent and high cost; 3. The length of the gas pipeline required for spraying is often greater than 100m; 4. The natural gas desulfurization treatment station occupies a large area; 5. The production and maintenance costs are high.

[0006] Therefore, it is of great significance to provide new desulfurization equipment and supporting processing technology for sulfur-containing natural gas in order to reduce the construction and production costs of desulfurization facilities. Summary of the Invention

[0007] This invention provides desulfurization equipment and utilization process for sulfur-containing natural gas. By using triazine desulfurizing agent to treat sulfur-containing natural gas, the gas-liquid contact area is increased, the desulfurization efficiency is improved, the consumption of desulfurizing agents is reduced, and the cost of natural gas desulfurization is lowered.

[0008] The first objective of this invention is to provide a desulfurization device for sulfur-containing natural gas, comprising a sulfur-containing natural gas pipeline, a vertical desulfurization reactor, and a purifier pipeline; The vertical desulfurization reactor is installed on the sulfur-containing natural gas pipeline. The lower part of the vertical desulfurization reactor is provided with a first inlet. One end of the first inlet inside the vertical desulfurization reactor faces upward, and the other end of the first inlet is connected to the sulfur-containing natural gas pipeline. The sulfur-containing natural gas flows upward through the first inlet. The vertical desulfurization reactor is provided with a second inlet, which is located below the first inlet. One end of the second inlet inside the vertical desulfurization reactor faces upward, and the other end of the second inlet is connected to a filling pipe for conveying triazine desulfurizing agent. The triazine desulfurizing agent flows upward through the second inlet, and the triazine desulfurizing agent and sulfur-containing natural gas come into contact and mix at the first inlet to form a gas-liquid mixture. A first outlet connected to the purified gas pipeline is provided at the upper end of the vertical desulfurization reactor, and a second outlet is provided at the upper part of the vertical desulfurization reactor. The second outlet is connected to the second inlet through a circulation pipeline. A circulation pump is provided on the circulation pipeline to realize the circulation backflow of a portion of the triazine desulfurizing agent. A liquid seal structure is provided between the circulation pipe and the second outlet to prevent the gas-liquid mixture from entering the circulation pump and causing cavitation.

[0009] Preferably, the injection pipeline is connected to the injection tank of the triazine desulfurizer, and an injection pump is installed on the injection pipeline.

[0010] Preferably, a gas-liquid separator is installed on the purified gas pipeline, and the waste liquid outlet of the gas-liquid separator is connected to a waste liquid pool.

[0011] Preferably, a triazine desulfurizing agent collection zone is provided at the bottom of the vertical desulfurization reactor, and the waste liquid outlet at the bottom of the collection zone is connected to a waste liquid pool.

[0012] Preferably, a third outlet is provided on the side of the collection area, the third outlet is connected to a circulation pipe for discharging triazine desulfurizer, and the circulation pipe is connected to the inlet of the circulation pump; and the height of the third outlet is lower than the height of the first inlet.

[0013] Preferably, packing material is provided inside the vertical desulfurization reactor, and the packing material is installed above the first inlet.

[0014] Preferably, the purified gas pipeline is equipped with an online hydrogen sulfide analyzer, which controls the injection pump via a controller.

[0015] Preferably, there are at least two vertical desulfurization reactors. The first inlet of the first vertical desulfurization reactor is connected to the sulfur-containing natural gas pipeline, and the first outlet is connected to the first inlet of the second vertical desulfurization reactor, and so on. The first outlet of the last vertical desulfurization reactor is connected to the purified gas pipeline.

[0016] A second objective of this invention is to provide a desulfurization process for treating sulfur-containing natural gas using the aforementioned desulfurization equipment, comprising the following steps: 1) A desulfurization pathway for removing hydrogen sulfide from sulfur-containing natural gas is formed using a vertical desulfurization reactor; 2) The triazine desulfurizing agent in the filling tank is transported through the filling pump and filling pipeline and introduced into the second inlet on the desulfurization path; the extracted sulfur-containing natural gas is transported through the sulfur-containing natural gas pipeline and introduced into the first inlet on the desulfurization path; 3) The triazine desulfurizing agent introduced into the second inlet flows upward into the vertical desulfurization reactor; the sulfur-containing natural gas introduced into the first inlet flows upward inside the vertical desulfurization reactor. 4) Above the first inlet, the flowing triazine desulfurizer comes into contact with the sulfur-containing natural gas and undergoes a desulfurization reaction to remove hydrogen sulfide from the sulfur-containing natural gas; 5) Desulfurization and gas-liquid separation are completed in the vertical desulfurization reactor, and the purified natural gas obtained enters the purified gas pipeline through the first outlet; or, the gas-liquid mixture of the desulfurization reaction enters the purified gas pipeline through the first outlet, and desulfurization and gas-liquid separation are completed in the purified gas pipeline to obtain purified natural gas.

[0017] The beneficial effects of this invention are: this invention increases the gas-liquid contact area and improves desulfurization efficiency; the sulfur-containing natural gas desulfurization equipment of this invention can reduce the consumption of desulfurization agents, reduce the desulfurization cost of natural gas, and reduce the safety risks caused by manual operation; the pipeline reactor used in the sulfur-containing gas desulfurization equipment of this invention solves the problems of high manufacturing cost and difficult maintenance of tower pressure vessels, and the equipment is easy to install and operate, ensuring that the purified natural gas meets the standards while achieving significant comprehensive benefits. Attached Figure Description

[0018] Figure 1 A schematic diagram of the structure of a prior art sulfur-containing natural gas desulfurization equipment is provided as the background of this invention; Figure 2 This is a schematic diagram of the desulfurization equipment provided in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the vertical desulfurization reactor provided in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the desulfurization equipment provided in Embodiment 2 of the present invention; Figure 5 This is a schematic diagram of the vertical desulfurization reactor provided in Embodiment 2 of the present invention; Figure 6 This is a schematic diagram of the desulfurization equipment provided in Embodiment 3 of the present invention; Figure 7 This is a schematic diagram of the vertical desulfurization reactor provided in Embodiment 3 of the present invention; Figure 8 This is a schematic diagram of the desulfurization equipment provided in Embodiment 4 of the present invention; Figure 9This is a schematic diagram of the desulfurization equipment provided in Embodiment 5 of the present invention; Figure 10 This is a schematic diagram of the structure of the first desulfurization device provided in Embodiment 6 of the present invention; Figure 11 This is a schematic diagram of the structure of the second desulfurization device provided in Embodiment 6 of the present invention; Figure 12 This is a schematic diagram of the structure of the third desulfurization device provided in Embodiment 6 of the present invention; Figure 13 This is a schematic diagram of the fourth desulfurization device provided in Embodiment 6 of the present invention; Figure 14 This is a schematic diagram of the fifth desulfurization device provided in Embodiment 6 of the present invention; Figure 15 This is a schematic diagram of the sixth desulfurization device provided in Embodiment 6 of the present invention; Figure 16 This is a schematic diagram of the structure of the seventh desulfurization device provided in Embodiment 6 of the present invention; Figure 17 This is a schematic diagram of the eighth desulfurization device provided in Embodiment 6 of the present invention; Figure 18 This is a schematic diagram of the ninth desulfurization device provided in Embodiment 6 of the present invention; Figure 19 This is a schematic diagram of the tenth desulfurization device provided in Embodiment 6 of the present invention; Figure 20 This is a structural block diagram of the desulfurization equipment provided in Embodiment 7 of the present invention.

[0019] The attached diagram lists the components represented by each number as follows: 1. Vertical desulfurization reactor; 2. Sulfur-containing natural gas pipeline; 3. Purified gas pipeline; 4. Filling tank; 5. Filling pump; 6. Filling pipeline; 7. Circulation pump; 8. Circulation pipeline; 9. Hydrogen sulfide online analyzer; 10. Waste liquid tank; 11. Nozzle; 12. First inlet; 13. Second inlet; 14. First outlet; 15. Collection area; 16. Third outlet; 17. Packing; 18. Gas-liquid separator; 19. Second outlet; 20. Liquid seal structure. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0021] Example 1 Based on the appendix Figure 2 and attached Figure 3 This embodiment provides a desulfurization device for treating sulfur-containing natural gas using triazine desulfurizing agent, including a sulfur-containing natural gas pipeline 2 and a purified gas pipeline 3. A vertical desulfurization reactor 1 is installed on the sulfur-containing natural gas pipeline 2. The central axis of the vertical desulfurization reactor 1 is perpendicular to the ground and is composed of a stainless steel pipe and stainless steel reducers welded to both ends of the stainless steel pipe.

[0022] A first inlet 12 is provided at the lower part of the vertical desulfurization reactor 1, and one end of the first inlet 12 inside the vertical desulfurization reactor 1 faces upward, while the other end of the first inlet 12 is connected to the sulfur-containing natural gas pipeline 2: sulfur-containing natural gas enters from the first inlet 12, causing the sulfur-containing natural gas to flow upward along the inner cavity of the vertical desulfurization reactor 1. A second inlet 13 is provided in the vertical desulfurization reactor 1. The second inlet 13 is connected to the injection pipe 6 for conveying triazine desulfurizing agent. The second inlet 13 is located above the first inlet 12, and one end of the second inlet 13 inside the vertical desulfurization reactor 1 is oriented downward. A nozzle 11 is provided at one end of the second inlet 13 inside the vertical desulfurization reactor 1. Triazine desulfurizing agent is sprayed out from the nozzle 11. The sprayed triazine desulfurizing agent flows downward along the inner cavity of the vertical desulfurization reactor 1 and comes into contact with the upward flowing sulfur-containing natural gas to carry out a desulfurization reaction. The filling pipe 6 is also connected to the filling tank 4 of the triazine desulfurizer; the filling tank 4 contains triazine desulfurizer that can chemically react with hydrogen sulfide; A filling pump 5 is installed on the filling pipeline 6; the filling pump 5 provides power for the flow of triazine desulfurizing agent inside the vertical desulfurization reactor 1; A first outlet 14 is provided at the upper end of the vertical desulfurization reactor 1, which is connected to the purified gas pipeline 3; the purified natural gas obtained by the desulfurization reaction at the upper part of the vertical desulfurization reactor 1 is discharged into the purified gas pipeline 3 through the first outlet 14.

[0023] In some instances, to facilitate the discharge of waste liquid from the desulfurization reaction, a triazine desulfurizing agent collection zone 15 is provided at the bottom of the vertical desulfurization reactor 1, and the waste liquid outlet at the bottom of the collection zone 15 is connected to the waste liquid pool 10.

[0024] In some instances, to improve the utilization rate of triazine desulfurizer, a third outlet 16 is provided on the side of the collection zone 15. The third outlet 16 is connected to the circulation pipe 8 that discharges the triazine desulfurizer. The circulation pipe 8 is connected to the inlet of the circulation pump 7. The incompletely reacted triazine desulfurizer is collected from the collection zone 15 and circulated using the circulation pump 7 to reduce the waste of triazine desulfurizer.

[0025] In some instances, the height of the third outlet 16 is lower than that of the first inlet 12 to prevent sulfur-containing natural gas from entering the circulation pipeline 8 and to prevent cavitation in the circulation pump 7, thus ensuring the safe and stable operation of the desulfurization process.

[0026] In some instances, to facilitate the discharge of waste liquid after the reaction of triazine desulfurizer and hydrogen sulfide, the waste liquid outlet at the bottom of the collection area 15 is connected to the waste liquid pool 10; the height of the waste liquid outlet of the collection area 15 is lower than the height of the second outlet 19.

[0027] In some instances, the waste liquid outlet of collection zone 15 is equipped with a valve; specifically, the valve is an electric valve, which is opened to discharge the waste liquid generated by the desulfurization reaction in collection zone 15.

[0028] In some instances, in order to increase the gas-liquid contact area, the vertical desulfurization reactor 1 is equipped with packing 17, which is installed above the first inlet 12 and below the second inlet 13; to facilitate the fixing of the packing 17, packing plates are provided above and below the packing 17.

[0029] In some instances, an online hydrogen sulfide analyzer 9 is installed on the purified gas pipeline 3. The online hydrogen sulfide analyzer 9 controls the injection pump via a controller to increase or decrease the injection of triazine desulfurizer.

[0030] In some instances, an online hydrogen sulfide analyzer 9 is installed on the purified gas pipeline 3. The online hydrogen sulfide analyzer 9 controls the circulating pump 7 via a controller to increase or decrease the circulation of the triazine desulfurizer.

[0031] The desulfurization process for treating sulfur-containing natural gas using the desulfurization equipment in this embodiment employs a triazine desulfurizing agent to remove hydrogen sulfide from the sulfur-containing natural gas, and includes the following steps: 1) A desulfurization pathway for removing hydrogen sulfide from sulfur-containing natural gas is formed using vertical desulfurization reactor 1; 2) The triazine desulfurizing agent in the filling tank 4 is transported through the filling pump 5 and the filling pipeline 6 and introduced into the second inlet 13 on the desulfurization path; the extracted sulfur-containing natural gas is transported through the sulfur-containing natural gas pipeline 2 and introduced into the first inlet 12 on the desulfurization path. 3) The triazine desulfurizing agent introduced into the second inlet 13 flows downward into the vertical desulfurization reactor 1; the sulfur-containing natural gas introduced into the first inlet 12 flows upward inside the vertical desulfurization reactor 1. 4) Above the first inlet 12, the flowing triazine desulfurizing agent comes into contact with the sulfur-containing natural gas and undergoes a desulfurization reaction to remove hydrogen sulfide from the sulfur-containing natural gas. 5) After the desulfurization reaction, desulfurization and gas-liquid separation are completed in the vertical desulfurization reactor 1, and the purified natural gas obtained enters the purified gas pipeline 3 through the first outlet 14.

[0032] Example 2 Based on the appendix Figure 4-5 This embodiment provides a desulfurization device for treating sulfur-containing natural gas using triazine desulfurizing agent, including a sulfur-containing natural gas pipeline 2 and a purified gas pipeline 3. A vertical desulfurization reactor 1 is installed on the sulfur-containing natural gas pipeline 2. The central axis of the vertical desulfurization reactor 1 is perpendicular to the ground and is composed of a stainless steel pipe and stainless steel reducers welded to both ends of the stainless steel pipe. A first inlet 12 is provided at the lower part of the vertical desulfurization reactor 1, and one end of the first inlet 12 inside the vertical desulfurization reactor 1 faces upward, while the other end of the first inlet 12 is connected to the sulfur-containing natural gas pipeline 2: sulfur-containing natural gas enters from the first inlet 12, causing the sulfur-containing natural gas to flow upward along the inner cavity of the vertical desulfurization reactor 1. The vertical desulfurization reactor 1 is provided with a second inlet 13, which is connected to the injection pipe 6 for conveying triazine desulfurizing agent; the second inlet 13 is located below the first inlet 12, and one end of the second inlet 13 inside the vertical desulfurization reactor 1 faces upward; the triazine desulfurizing agent enters from the second inlet 13, flows upward in the inner cavity of the vertical desulfurization reactor 1, contacts the upward flowing sulfur-containing natural gas, and carries out a desulfurization reaction; The filling pipe 6 is also connected to the triazine desulfurizer filling tank 4; the filling tank 4 contains triazine desulfurizer that can chemically react with hydrogen sulfide; A filling pump 5 is installed on the filling pipeline 6; the filling pump 5 provides power for the flow of triazine desulfurizing agent inside the vertical desulfurization reactor 1; A first outlet 14 is provided at the upper end of the vertical desulfurization reactor 1, which is connected to the purified gas pipeline 3. The gas-liquid mixture of triazine desulfurizing agent and sulfur-containing natural gas flowing upward is discharged from the first outlet 14 into the purified gas pipeline 3 for gas-liquid separation to obtain purified natural gas.

[0033] In some instances, a gas-liquid separator 18 is installed on the purified gas pipeline 3 to facilitate gas-liquid separation; the waste liquid outlet of the gas-liquid separator 18 is connected to the waste liquid pool 10.

[0034] It should be noted that the desulfurization reaction between the triazine desulfurizer and the gas-liquid mixture of sulfur-containing natural gas occurs due to contact until gas-liquid separation. The gas phase separated in the gas-liquid separator 18 is purified natural gas, and the separated liquid phase is waste liquid with extremely low triazine compound content.

[0035] In some examples, to improve desulfurization efficiency, a second outlet 19 is provided at the top of the vertical desulfurization reactor 1. The second outlet 19 is connected to the inlet of the circulation pump 7 through a circulation pipe 8. A liquid seal structure 20 is provided between the circulation pipe 8 and the second outlet 19. The setting of the second outlet 19 can realize the circulation backflow of a portion of the triazine desulfurizing agent inside the vertical desulfurization reactor 1, thereby ensuring that the triazine desulfurizing agent between the first inlet 12 and the second outlet 19 has a certain concentration, which can fully remove hydrogen sulfide. At the same time, it also ensures that there is a remaining portion of triazine desulfurizing agent between the second outlet 19 and the gas-liquid separator 18, which further removes and reduces the hydrogen sulfide content in the natural gas. The triazine compounds in the triazine desulfurizing agent react completely at the gas-liquid separator 18, preventing triazine compounds from entering the waste liquid and improving the desulfurization efficiency of the triazine desulfurizing agent.

[0036] It should be noted that the liquid seal structure 20 is designed to prevent the gas-liquid mixture from entering the circulating pump 7 through the circulating pipe 8, which would cause "cavitation" and affect the normal operation of the circulating pump 7. The liquid seal structure 20 can be a "U" shaped bend or other structures that can prevent natural gas from entering and promote gas-liquid separation.

[0037] In some instances, to facilitate the discharge of waste liquid from the desulfurization reaction, a triazine desulfurizing agent collection zone 15 is provided at the bottom of the vertical desulfurization reactor 1, and the waste liquid outlet at the bottom of the collection zone 15 is connected to the waste liquid pool 10.

[0038] In some instances, packing material 17 is installed inside the vertical desulfurization reactor 1, and the packing material 17 is installed above the first inlet 12. The packing material 17 can promote the contact between the upward flowing triazine desulfurizing agent and the sulfur-containing natural gas, thereby improving the desulfurization efficiency. Packing plates are provided on both the upper and lower sides of the packing material 17 to fix the packing material 17.

[0039] It should be noted that the product of the reaction between triazine desulfurizer and hydrogen sulfide is non-solid. Therefore, the packing material 17 inside the vertical desulfurization reactor 1 will not block the upward flow of desulfurization path. However, the oxidant for conventional natural gas desulfurization is usually hydrogen sulfide to obtain sulfur solid. Even if the packing material 17 is not installed inside the vertical desulfurization reactor 1, it will still block the vertical desulfurization reactor 1, which is not conducive to the continuous desulfurization of sulfur-containing natural gas and makes subsequent maintenance more complicated.

[0040] In some instances, an online hydrogen sulfide analyzer 9 is installed on the purified gas pipeline 3. The online hydrogen sulfide analyzer 9 controls the injection pump via a controller to increase or decrease the injection of triazine desulfurizer.

[0041] In some instances, an online hydrogen sulfide analyzer 9 is installed on the purified gas pipeline 3. The online hydrogen sulfide analyzer 9 controls the circulating pump 7 via a controller to increase or decrease the circulation of the triazine desulfurizer.

[0042] The desulfurization process for treating sulfur-containing natural gas using the desulfurization equipment in this embodiment employs a triazine desulfurizing agent to remove hydrogen sulfide from the sulfur-containing natural gas, and includes the following steps: 1) A desulfurization pathway for removing hydrogen sulfide from sulfur-containing natural gas is formed using vertical desulfurization reactor 1; 2) The triazine desulfurizing agent in the filling tank 4 is transported through the filling pump 5 and the filling pipeline 6 and introduced into the second inlet 13 on the desulfurization path; the extracted sulfur-containing natural gas is transported through the sulfur-containing natural gas pipeline 2 and introduced into the first inlet 12 on the desulfurization path. 3) The triazine desulfurizing agent introduced into the second inlet 13 flows upward into the vertical desulfurization reactor 1; the sulfur-containing natural gas introduced into the first inlet 12 flows upward inside the vertical desulfurization reactor 1; 4) Above the first inlet 12, the flowing triazine desulfurizing agent comes into contact with the sulfur-containing natural gas and undergoes a desulfurization reaction to remove hydrogen sulfide from the sulfur-containing natural gas. 5) The gas-liquid mixture from the desulfurization reaction enters the purified gas pipeline 3 through the first outlet 14, where desulfurization and gas-liquid separation are completed to obtain purified natural gas.

[0043] Example 3 Based on the appendix Figure 6-7 This embodiment provides a desulfurization device for treating sulfur-containing natural gas using triazine desulfurizing agent, including a sulfur-containing natural gas pipeline 2 and a purified gas pipeline 3. Four vertical desulfurization reactors 1 are installed on the sulfur-containing natural gas pipeline 2. The central axis of each vertical desulfurization reactor 1 is perpendicular to the ground and consists of a stainless steel pipe and stainless steel reducers welded to both ends of the stainless steel pipe. A first inlet 12 is provided at the bottom of each vertical desulfurization reactor 1, and one end of the first inlet 12 inside each vertical desulfurization reactor 1 faces upward. The other end of the first inlet 12 of the first vertical desulfurization reactor 1 is connected to the sulfur-containing natural gas pipeline 2. The sulfur-containing natural gas enters through the first inlet 12, causing the sulfur-containing natural gas to flow upward along the inner cavity of each vertical desulfurization reactor 1. A second inlet 13 is provided in the first vertical desulfurization reactor 1. The second inlet 13 is connected to the injection pipe 6 for conveying triazine desulfurizing agent. The second inlet 13 is located below the first inlet 12 of the first vertical desulfurization reactor 1, and one end of the second inlet 13 inside the first vertical desulfurization reactor 1 faces upward. The triazine desulfurizing agent enters from the second inlet 13, flows upward in the inner cavity of the vertical desulfurization reactor 1, contacts the upward flowing sulfur-containing natural gas, and carries out a desulfurization reaction. The filling pipe 6 is also connected to the triazine desulfurizer filling tank 4; the filling tank 4 contains triazine desulfurizer that can chemically react with hydrogen sulfide; A filling pump 5 is installed on the filling pipeline 6; the filling pump 5 provides power for the flow of triazine desulfurizing agent inside the vertical desulfurization reactor 1; Each vertical desulfurization reactor 1 has a first outlet 14 at its upper end; the gas-liquid mixture of triazine desulfurizing agent and sulfur-containing natural gas flowing upward is discharged from the first outlet 14 into the purified gas pipeline 3 for gas-liquid separation to obtain purified natural gas; wherein, the first outlet 14 of the first vertical desulfurization reactor 1 is connected to the first inlet 12 of the second vertical desulfurization reactor 1, and so on; the first outlet 14 of the last vertical desulfurization reactor 1 is connected to the purified gas pipeline 3.

[0044] In this embodiment, the triazine desulfurizing agent enters the interior of the first vertical desulfurization reactor 1 through the second inlet 13, and the sulfur-containing natural gas enters the interior of the first vertical desulfurization reactor 1 through the first inlet 12. The triazine desulfurizing agent and the sulfur-containing natural gas come into contact and mix at the first inlet 12 to form a gas-liquid mixture. The gas-liquid mixture continues to flow upward and enters the second inlet 13 of the second vertical desulfurization reactor 1 through the first outlet 14 of the first vertical desulfurization reactor 1, and sequentially passes through the remaining vertical desulfurization reactors 1. The gas-liquid mixture is discharged into the purified gas pipeline 3 from the first outlet 14 of the last vertical desulfurization reactor 1, and purified natural gas is obtained through gas-liquid separation.

[0045] In some instances, a gas-liquid separator 18 is installed on the purified gas pipeline 3 to facilitate gas-liquid separation; the waste liquid outlet of the gas-liquid separator 18 is connected to the waste liquid pool 10.

[0046] It should be noted that the desulfurization reaction between the triazine desulfurizer and the gas-liquid mixture of sulfur-containing natural gas occurs due to contact until gas-liquid separation. The gas phase separated in the gas-liquid separator 18 is purified natural gas, and the separated liquid phase is waste liquid with extremely low triazine compound content.

[0047] In some examples, to improve desulfurization efficiency, a second outlet 19 is provided at the bottom of the last vertical desulfurization reactor 1. The second outlet 19 is connected to the inlet of the circulation pump 7 through a circulation pipe 8. The height of the second outlet 19 is lower than the height of the first inlet 12 of the last vertical desulfurization reactor 1. The setting of the second outlet 19 can realize the circulation backflow of a portion of the triazine desulfurizing agent inside the vertical desulfurization reactor 1, thereby ensuring a certain concentration from the first inlet 12 of the first vertical desulfurization reactor 1 to the first inlet 12 of the last vertical desulfurization reactor 1, so as to fully remove hydrogen sulfide.

[0048] In some instances, to facilitate the discharge of waste liquid from the desulfurization reaction, a collection zone 15 is provided at the bottom of each vertical desulfurization reactor 1, and the waste liquid outlet at the bottom of the collection zone 15 is connected to the waste liquid pool 10; the second outlet 19 of the last vertical desulfurization reactor 1 is located on the side of the collection zone 15.

[0049] In some instances, packing material 17 is provided inside each vertical desulfurization reactor 1, and the packing material 17 is installed above the first inlet 12 of each vertical desulfurization reactor 1; the packing material 17 can promote the contact between the upward-growing triazine desulfurizing agent and the sulfur-containing natural gas, thereby improving the desulfurization efficiency; packing plates are provided on both the upper and lower sides of the packing material 17 to fix the packing material 17.

[0050] It should be noted that the product of the reaction between triazine desulfurizer and hydrogen sulfide is non-solid. Therefore, the packing material 17 inside the vertical desulfurization reactor 1 will not block the upward flow of desulfurization path. However, the oxidant for conventional natural gas desulfurization is usually to obtain sulfur solid by oxidizing hydrogen sulfide. Even if the packing material 17 is not installed inside the vertical desulfurization reactor 1, it will still block the vertical desulfurization reactor 1, which is not conducive to the continuous desulfurization of sulfur-containing natural gas and makes subsequent maintenance more complicated.

[0051] In some instances, an online hydrogen sulfide analyzer 9 is installed on the purified gas pipeline 3. The online hydrogen sulfide analyzer 9 controls the injection pump via a controller to increase or decrease the injection of triazine desulfurizer.

[0052] In some instances, an online hydrogen sulfide analyzer 9 is installed on the purified gas pipeline 3. The online hydrogen sulfide analyzer 9 controls the circulating pump 7 via a controller to increase or decrease the circulation of the triazine desulfurizer.

[0053] The desulfurization process for treating sulfur-containing natural gas using the desulfurization equipment in this embodiment employs a triazine desulfurizing agent to remove hydrogen sulfide from the sulfur-containing natural gas, and includes the following steps: 1) A desulfurization pathway for removing hydrogen sulfide from sulfur-containing natural gas is formed using vertical desulfurization reactor 1; 2) The triazine desulfurizing agent in the filling tank 4 is transported through the filling pump 5 and the filling pipeline 6 and introduced into the first second inlet 13 on the desulfurization path; the extracted sulfur-containing natural gas is transported through the sulfur-containing natural gas pipeline 2 and introduced into the first first inlet 12 on the desulfurization path. 3) The triazine desulfurizing agent introduced into the second inlet 13 flows upward into the vertical desulfurization reactor 1; the sulfur-containing natural gas introduced into the first inlet 12 flows upward inside the vertical desulfurization reactor 1; 4) Above the first inlet 12, the flowing triazine desulfurizer comes into contact with the sulfur-containing natural gas and undergoes a desulfurization reaction to remove hydrogen sulfide from the sulfur-containing natural gas. 5) The gas-liquid mixture from the desulfurization reaction enters the first inlet 12 of the second vertical desulfurization reactor 1 through the first outlet 14, and then passes through other vertical desulfurization reactors 1 in sequence. Finally, it is discharged into the purified gas pipeline 3 from the first outlet 14 of the last vertical desulfurization reactor 1. The gas-liquid mixture completes desulfurization and gas-liquid separation in the purified gas pipeline 3 to obtain purified natural gas.

[0054] Example 4 Based on the appendix Figure 7-8 The desulfurization equipment for treating sulfur-containing natural gas using triazine desulfurizing agent provided in this embodiment differs from that in Embodiments 2 and 3 in that the vertical desulfurization reactor 1 is provided with 2 to 3 or at least 5.

[0055] Example 5 Based on the appendix Figure 3 , 9 The desulfurization equipment provided in this embodiment, which uses triazine desulfurizing agent to treat sulfur-containing natural gas, differs from that in Embodiment 1 in that the vertical desulfurization reactor 1 is provided with at least two.

[0056] Example 6 Based on the appendix Figure 3 , 5 7 and 10-19, this embodiment provides the first to tenth desulfurization equipment for treating sulfur-containing natural gas using triazine desulfurizing agent. Compared with embodiments 1-5, the difference is that: at least two vertical desulfurization reactors 1 are provided, and the height position of the second inlet 13 of at least one vertical desulfurization reactor 1 is higher than the height position of its first inlet 12, and the height position of the second inlet 13 of at least one vertical desulfurization reactor 1 is lower than the height position of its first inlet 12.

[0057] Example 7 Based on the appendix Figure 20 This embodiment provides a desulfurization device for treating sulfur-containing natural gas using triazine desulfurizing agent. At least two desulfurization paths are provided between the sulfur-containing natural gas pipeline 2 and the purified gas pipeline 3. The vertical desulfurization reactor 1 on each desulfurization path is selected from any of the embodiments 1-6. Other structures, such as the injection tank 4 and the injection pump 5, can be set separately or in combination according to the vertical desulfurization reactor 1 in embodiments 1-6.

[0058] To further demonstrate the effectiveness of the desulfurization equipment of this invention, which utilizes triazine desulfurizing agent to treat sulfur-containing natural gas, in improving the desulfurization effect of sulfur-containing natural gas, the following experimental examples and comparative examples are provided: Experimental Example 1 This experimental example uses the desulfurization equipment for treating sulfur-containing natural gas with triazine desulfurizing agent as described in Example 1. The equipment is used to treat sulfur-containing natural gas flowing into a pipeline at a flow rate of 400 Nm³. 3 Desulfurization is performed on sulfur-containing natural gas with a hydrogen sulfide content of 1200 ppm per hour.

[0059] After the sulfur-containing natural gas desulfurization equipment in this experiment operated continuously and stably for 10 days, the total amount of fresh triazine desulfurizing agent added was 2150 kg, and the average amount of triazine desulfurizing agent added during the test (= total amount of fresh triazine desulfurizing agent added / number of test days) was 215 kg / d.

[0060] Experiment Example 2 This experimental example uses the desulfurization equipment for treating sulfur-containing natural gas with triazine desulfurizing agent as described in Example 2. The equipment is used to treat sulfur-containing natural gas flowing into a pipeline with a flow rate of 300 Nm³. 3 Desulfurization is performed on sulfur-containing natural gas with a hydrogen sulfide content of 1300 ppm per hour.

[0061] After the sulfur-containing natural gas desulfurization equipment in this experiment operated continuously and stably for 10 days, the total amount of fresh triazine desulfurizer added was 1390 kg, and the average amount of triazine desulfurizer added during the test (=total amount of fresh triazine desulfurizer added / number of test days) was 139 kg / d.

[0062] Experimental Example 3 This experimental example uses the desulfurization equipment for treating sulfur-containing natural gas with triazine desulfurizing agent as described in Example 3. The sulfur-containing natural gas flows into a pipeline at a flow rate of 380 Nm. 3 Desulfurization is performed on sulfur-containing natural gas with a hydrogen sulfide content of 2900 ppm per hour.

[0063] After the sulfur-containing natural gas desulfurization equipment in this experiment operated continuously and stably for 10 days, the total amount of fresh triazine desulfurizer added was 4460 kg, and the average amount of triazine desulfurizer added during the test (=total amount of fresh triazine desulfurizer added / number of test days) was 446 kg / d.

[0064] Comparative Example 1 This comparative example is based on the appendix. Figure 1 The paper describes a desulfurization method using triazine desulfurizing agent directly sprayed into the gas pipeline. This involves setting up three spray points on the pipeline to atomize the agent and spray it into the pipeline, thereby achieving natural gas desulfurization. The total length of the gas pipeline from the gas well to the gas-liquid separator is 105m; purified natural gas is obtained from the gas-liquid separation process in the separator.

[0065] This comparative example demonstrates the desulfurization of sulfur-containing natural gas flowing into a pipeline at a flow rate of 380 Nm³ / h and a hydrogen sulfide content of 2900 ppm.

[0066] After the sulfur-containing natural gas desulfurization equipment in this comparative example operated continuously and stably for 10 days, the daily amount of triazine desulfurizer added during the test was 5360 kg, and the average amount of triazine desulfurizer added during the test (=total amount of fresh triazine desulfurizer added / number of test days) was 536 kg / d.

[0067] Comparative Example 2 The equipment in this comparative example is the same as that in Comparative Example 1.

[0068] This comparative example compares the inflow of sulfur-containing natural gas into a pipeline with a flow rate of 400 Nm. 3 Desulfurization is performed on sulfur-containing natural gas with a hydrogen sulfide content of 1200 ppm per hour.

[0069] After the sulfur-containing natural gas desulfurization equipment in this comparative example operated continuously and stably for 10 days, the total amount of fresh triazine desulfurizing agent added was 2820 kg, and the average amount of triazine desulfurizing agent added during the test (= total amount of fresh triazine desulfurizing agent added / number of test days) was 282 kg / d.

Claims

1. A desulfurization device for sulfur-containing natural gas, characterized in that, This includes sulfur-containing natural gas pipelines, vertical desulfurization reactors, and purifier pipelines; The vertical desulfurization reactor is installed on the sulfur-containing natural gas pipeline. The lower part of the vertical desulfurization reactor is provided with a first inlet. One end of the first inlet inside the vertical desulfurization reactor faces upward, and the other end of the first inlet is connected to the sulfur-containing natural gas pipeline. The sulfur-containing natural gas flows upward through the first inlet. The vertical desulfurization reactor is provided with a second inlet, which is located below the first inlet. One end of the second inlet inside the vertical desulfurization reactor faces upward, and the other end of the second inlet is connected to a filling pipe for conveying triazine desulfurizing agent. The triazine desulfurizing agent flows upward through the second inlet, and the triazine desulfurizing agent and sulfur-containing natural gas come into contact and mix at the first inlet to form a gas-liquid mixture. A first outlet connected to the purified gas pipeline is provided at the upper end of the vertical desulfurization reactor, and a second outlet is provided at the upper part of the vertical desulfurization reactor. The second outlet is connected to the second inlet through a circulation pipeline. A circulation pump is provided on the circulation pipeline to realize the circulation backflow of a portion of the triazine desulfurizing agent. A liquid seal structure is provided between the circulation pipe and the second outlet to prevent the gas-liquid mixture from entering the circulation pump and causing cavitation.

2. The desulfurization equipment for sulfur-containing natural gas according to claim 1, characterized in that, The filling pipeline is connected to the filling tank of the triazine desulfurizer, and a filling pump is installed on the filling pipeline.

3. The desulfurization equipment for sulfur-containing natural gas according to claim 1, characterized in that, A gas-liquid separator is installed on the purified gas pipeline, and the waste liquid outlet of the gas-liquid separator is connected to the waste liquid pool.

4. The desulfurization equipment for sulfur-containing natural gas according to claim 3, characterized in that, A triazine desulfurizing agent collection area is provided at the bottom of the vertical desulfurization reactor, and the waste liquid outlet at the bottom of the collection area is connected to a waste liquid pool.

5. The desulfurization equipment for sulfur-containing natural gas according to claim 4, characterized in that, A third outlet is provided on the side of the collection area. The third outlet is connected to a circulation pipe that discharges triazine desulfurizer. The circulation pipe is connected to the inlet of the circulation pump. The height of the third outlet is lower than that of the first inlet.

6. The desulfurization equipment for sulfur-containing natural gas according to claim 1, characterized in that, The vertical desulfurization reactor is equipped with packing material, which is installed above the first inlet.

7. The desulfurization equipment for sulfur-containing natural gas according to claim 1, characterized in that, An online hydrogen sulfide analyzer is installed on the purified gas pipeline, and the online hydrogen sulfide analyzer controls the injection pump through a controller.

8. The desulfurization equipment for sulfur-containing natural gas according to any one of claims 1-7, characterized in that, The vertical desulfurization reactor comprises at least two reactors. The first inlet of the first vertical desulfurization reactor is connected to the sulfur-containing natural gas pipeline, and the first outlet is connected to the first inlet of the second vertical desulfurization reactor, and so on. The first outlet of the last vertical desulfurization reactor is connected to the purified gas pipeline.

9. A desulfurization process for treating sulfur-containing natural gas using the desulfurization equipment according to any one of claims 1-8, characterized in that, Includes the following steps: 1) A desulfurization pathway for removing hydrogen sulfide from sulfur-containing natural gas is formed using a vertical desulfurization reactor; 2) The triazine desulfurizing agent in the filling tank is transported through the filling pump and filling pipeline and introduced into the second inlet on the desulfurization path; the extracted sulfur-containing natural gas is transported through the sulfur-containing natural gas pipeline and introduced into the first inlet on the desulfurization path; 3) The triazine desulfurizing agent introduced into the second inlet is injected into the vertical desulfurization reactor and flows upward; The sulfur-containing natural gas introduced into the first inlet flows upward inside the vertical desulfurization reactor; 4) Above the first inlet, the flowing triazine desulfurizer comes into contact with the sulfur-containing natural gas and undergoes a desulfurization reaction to remove hydrogen sulfide from the sulfur-containing natural gas; 5) Desulfurization and gas-liquid separation are completed in the vertical desulfurization reactor, and the purified natural gas obtained enters the purified gas pipeline through the first outlet; or, the gas-liquid mixture of the desulfurization reaction enters the purified gas pipeline through the first outlet, and desulfurization and gas-liquid separation are completed in the purified gas pipeline to obtain purified natural gas.

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