A storage device for the fractional recovery of hydrogen sulfide solutions in chemical systems

Abstract

The utility model relates to hydrogen sulfide solution recycling technical field, specifically disclose a kind of for the storage device of hierarchical recovery hydrogen sulfide solution in chemical system, including storage tank A, storage tank B, storage tank C, primary feed pipeline, secondary feed pipeline, primary liquid phase recovery pipeline, secondary liquid phase recovery pipeline and gas phase recovery pipeline, the primary feed pipeline and primary liquid phase recovery pipeline are connected with storage tank B and storage tank C respectively, the secondary feed pipeline and secondary liquid phase recovery pipeline are connected with storage tank A respectively, the gas phase recovery pipeline is connected with storage tank A, storage tank B and storage tank C respectively.The storage device can be according to hydrogen sulfide solution concentration hierarchical storage and return as required, to realize the safe, efficient, closed loop recycling of hydrogen sulfide, reduce enterprise operating cost, meet increasingly stringent environmental protection and safety production requirement simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen sulfide solution recycling technology, specifically disclosing a storage device for graded recovery of hydrogen sulfide solution in a chemical system. Background Technology

[0002] Hydrogen sulfide (H2S), as an important chemical raw material, is widely used in petroleum refining, natural gas purification, fertilizer production, and fine chemicals. However, hydrogen sulfide has dangerous characteristics such as being highly toxic, flammable, explosive, and corrosive. During the operation of chemical plants, in the event of a malfunction, planned shutdown, or maintenance, any residual hydrogen sulfide-containing materials in the system must be discharged promptly and safely to ensure personnel safety and equipment integrity.

[0003] Currently, industrial applications commonly use water-sealed storage tanks or alkaline absorption systems for temporary capture and treatment of emitted hydrogen sulfide. While this method can suppress direct hydrogen sulfide emissions to some extent, it has significant drawbacks: Firstly, due to the limited solubility of hydrogen sulfide in water and its significant influence from temperature and pressure, large amounts of gas are difficult to absorb effectively, easily leading to a rapid increase in pressure inside the storage tank. Secondly, to prevent overpressure-induced safety accidents, the system is usually equipped with a safety venting device, which burns excess hydrogen sulfide that cannot be absorbed through a flare. This "absorption-overpressure-venting-incineration" treatment mode not only wastes a large amount of high-value hydrogen sulfide resources but also increases the environmental burden due to the potential generation of secondary pollutants such as sulfur dioxide caused by incomplete combustion.

[0004] More importantly, the concentration of hydrogen sulfide discharged in actual operation fluctuates greatly, ranging from low to high concentrations. Existing storage systems are mostly single-tank structures, lacking the ability to store hydrogen sulfide solutions of different concentrations in stages. This results in high-concentration solutions being diluted or mixed with low-concentration materials, which not only reduces the efficiency of subsequent recycling but also increases purification costs.

[0005] In summary, existing technologies for hydrogen sulfide emission treatment suffer from significant resource losses, high environmental pollution risks, inefficient storage methods, and the inability to achieve concentration-based management. Therefore, there is an urgent need to develop a dedicated storage device capable of tiered storage based on hydrogen sulfide concentration and supporting on-demand return. This would enable safe, efficient, and closed-loop recycling of hydrogen sulfide, reduce enterprise operating costs, and meet increasingly stringent environmental and safety production requirements. Utility Model Content

[0006] The purpose of this invention is to provide a storage device for graded recovery of hydrogen sulfide solution in a chemical system. This device can store hydrogen sulfide solution in stages according to its concentration and return it as needed, thereby achieving safe, efficient, and closed-loop recovery and utilization of hydrogen sulfide, reducing enterprise operating costs, and meeting increasingly stringent environmental protection and safety production requirements.

[0007] This utility model is achieved through the following technical solution: A storage device for the graded recovery of hydrogen sulfide solution in a chemical system includes storage tank A, storage tank B, storage tank C, a primary feed line, a secondary feed line, a primary liquid phase recovery line, a secondary liquid phase recovery line, and a gas phase recovery line. The primary feed line and the primary liquid phase recovery line are connected to storage tank B and storage tank C, respectively. The secondary feed line and the secondary liquid phase recovery line are connected to storage tank A, respectively. The gas phase recovery line is connected to storage tank A, storage tank B, and storage tank C, respectively.

[0008] Furthermore, level gauges and pressure gauges are installed on storage tanks A, B, and C.

[0009] Furthermore, the primary feed pipeline is connected to storage tank B and storage tank C respectively via feed branch pipes. Valve 1 is installed on the primary feed pipeline, and valve 2 is installed on the feed branch pipe.

[0010] Furthermore, the primary liquid phase recovery pipeline is connected to storage tank B and storage tank C respectively through the discharge branch pipe. The primary liquid phase recovery pipeline is equipped with valve three and reflux pump one, and the discharge branch pipe is equipped with valve four.

[0011] Furthermore, valve five is installed on the secondary feed pipeline, and valve six and reflux pump two are installed on the secondary liquid phase recovery pipeline.

[0012] Furthermore, sampling lines are installed on the primary liquid phase recovery pipeline and the secondary liquid phase recovery pipeline, and valve seven is installed on the sampling lines.

[0013] Furthermore, the gas phase recovery pipeline is connected to storage tanks A, B and C respectively via gas phase branch pipes, the end of the gas phase recovery pipeline is connected to a water tank, valve eight is installed on the gas phase recovery pipeline, and valve nine is installed on the gas phase branch pipe.

[0014] Furthermore, a venting line is also connected to the gas phase recovery pipeline, and a valve is installed on the venting line.

[0015] The technical solution of this utility model has at least the following advantages and beneficial effects: Because the feed solution contains saturated hydrogen sulfide, the other components in the feed solution have different values ​​depending on their concentration. The first stage has a large volume of dilute feed solution, while the second stage has a small volume of high-concentration feed solution but higher value. If a low-concentration feed solution enters the second stage, the second stage will need a longer operating time to increase the concentration within the stage to achieve system concentration balance and reach production status. If a high-concentration feed solution goes to the first stage, it will be diluted and its value will be reduced.

[0016] Therefore, this invention, based on the different concentrations of different stages in the system, can simultaneously meet the recovery and storage of liquid containing hydrogen sulfide of different concentrations through graded storage, and return the corresponding stage according to the concentration, thereby reducing the concentration rebalancing time when the system starts up.

[0017] The storage tank allows for the complete recovery of both liquid feed and hydrogen sulfide gaseous phase from the chemical system, eliminating the safety hazard of system overpressure caused by water absorption. It also enables tiered storage based on different feed concentrations, and the hydrogen sulfide solution is returned to the corresponding stage in the system based on the liquid concentration in the storage tank, achieving safe and efficient closed-loop recovery and reuse of hydrogen sulfide. During process system startup, the data from the liquid feed and hydrogen sulfide concentration monitoring in the storage tank is returned to the corresponding stage in the process system. Hydrogen sulfide that would otherwise be incinerated in traditional processes is stored and reused after startup, significantly reducing hydrogen sulfide loss in the system, lowering environmental pollution, and improving system safety. Tiered storage and return of the liquid feed reduces system concentration fluctuations and effectively shortens system balancing time. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a storage device for graded recovery of hydrogen sulfide solution in a chemical system, provided in Embodiment 1 of this utility model.

[0020] Attached reference numerals: 1-Storage Tank A, 2-Storage Tank B, 3-Storage Tank C, 4-Primary Feed Line, 5-Secondary Feed Line, 6-Primary Liquid Phase Recovery Line, 7-Secondary Liquid Phase Recovery Line, 8-Gas Phase Recovery Line, 9-Level Gauge, 10-Pressure Gauge, 12-Feed Branch Pipe, 13-Valve 1, 14-Valve 2, 15-Discharge Branch Pipe, 16-Valve 3, 17-Reflux Pump 1, 18-Valve 4, 19-Valve 5, 20-Valve 6, 21-Reflux Pump 2, 22-Sampling Line, 23-Valve 7, 24-Gas Phase Branch Pipe, 25-Valve 8, 26-Valve 9, 27-Vent Line, 28-Valve 10. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] Example 1 Reference Figure 1This embodiment provides a storage device for the staged recovery of hydrogen sulfide solution in a chemical system, including storage tanks A1, B2, and C3, a primary feed line 4, a secondary feed line 5, a primary liquid phase recovery line 6, a secondary liquid phase recovery line 7, and a gas phase recovery line 8. Level gauges 9 and pressure gauges 10 are installed on storage tanks A1, B2, and C3. Sampling lines 22 are installed on the primary liquid phase recovery line 6 and the secondary liquid phase recovery line 7, and valves 23 are installed on the sampling lines 22. It should be noted that the storage tanks have a large volume and high pressure resistance; their volume is three times that of a water absorption tank, and they can withstand a high pressure of 2.0 MPa. The storage tanks are made of composite steel and are resistant to hydrogen sulfide corrosion. The purpose of the storage tanks is to store hydrogen sulfide and hydrogen sulfide solution in the system during shutdown and to return the hydrogen sulfide solution to the corresponding stage during startup.

[0026] The primary feed line 4 is connected to storage tanks B2 and C3 via feed branch pipes 12. Valve 13 is installed on the primary feed line 4, and valve 14 is installed on the feed branch pipe 12. The primary liquid phase recovery line 6 is connected to storage tanks B2 and C3 via discharge branch pipes 15. Valve 16 and reflux pump 17 are installed on the primary liquid phase recovery line 6, and valve 18 is installed on the discharge branch pipe 15.

[0027] The secondary feed line 5 is equipped with valve 19, and the secondary liquid phase recovery line 7 is equipped with valve 20 and reflux pump 21.

[0028] The gas phase recovery pipeline 8 is connected to storage tanks A1, B2, and C3 via gas phase branch pipes 24. The end of the gas phase recovery pipeline 8 is connected to a water tank. A valve 8 25 is installed on the gas phase recovery pipeline 8, and a valve 9 26 is installed on the gas phase branch pipe 24. A vent pipeline 27 is also connected to the gas phase recovery pipeline 8, and a valve 10 28 is installed on the vent pipeline 27.

[0029] Operating procedures: (I) Primary hydrogen sulfide solution and return process (Primary stage is suitable for the storage and return of large quantities of low-concentration hydrogen sulfide solutions): 1. Open valve 2 13 on the feed branch pipe 12 connecting storage tank B2 and storage tank C3, and at the same time open valve 9 26 on the top gas phase branch pipe 24. Close valve 4 18 on the discharge branch pipe 15 connecting storage tank B2 and storage tank C3 and valve 8 25 on the gas phase recovery pipeline 8.

[0030] 2. Open valve 13 on the primary feed line 4 to discharge liquid or hydrogen sulfide gas into storage tanks B2 and C3.

[0031] 3. By observing the liquid level gauge 9 and pressure gauge 10 of storage tanks B2 and C3, when the pressure level and pressure no longer rise, the drainage or venting is completed, and valve 13 and valve 24 are closed.

[0032] 4. The liquid in storage tanks B2 and C3 is sampled through sampling pipeline 22, i.e., by opening valve 23 to take samples, and the corresponding liquid concentrations of storage tanks B2 and C3 are marked. Valve 16 on the primary liquid phase recovery pipeline 6 is opened. According to the liquid concentration, the return pump 17 is opened to return the liquid to the primary sleeve with a similar concentration. After the return is completed, valve 16 is closed.

[0033] 5. When hydrogen sulfide gas remains in storage tanks B2 and C3, open valve 825. The hydrogen sulfide enters the water tank for absorption, dissolves in the water, and then returns to the system. When the pressure in storage tanks B2 and C3 drops to 0.02 MPa, the return gas is completed and valve 825 is closed.

[0034] (II) Secondary hydrogen sulfide solution storage and return process (secondary is suitable for storing high-concentration hydrogen sulfide solutions in small quantities): 1. Open the liquid inlet valve of storage tank A1 and valve 26 on the top gas phase branch pipe 24, and close valve 20 on the bottom secondary liquid phase outlet pipe 7 and valve 25 on the gas phase recovery pipe 8.

[0035] 2. Open valve 19 on the secondary feed line 5 to discharge the liquid feed or hydrogen sulfide gas into the storage tank A1.

[0036] 3. By observing the liquid level gauge 9 and pressure gauge 10 of storage tank A1, when the pressure level and pressure no longer rise, the drainage or venting is completed, and the liquid inlet valve, valve 9 26 and valve 5 19 of storage tank A1 are closed.

[0037] 4. The liquid in storage tank A1 is sampled through sampling pipeline 22, that is, by opening valve 23 to take a sample and marking the liquid concentration corresponding to storage tank A1.

[0038] 5. When the system returns material in stages, open valve 620 and close the corresponding valves of other storage tanks. Based on the concentration of the liquid, start reflux pump 221 to return the material to the stage with a similar concentration. Once the return is complete, close valve 620.

[0039] 6. When hydrogen sulfide gas remains in storage tank A, open valves 825 and 926. The hydrogen sulfide enters the water tank, is absorbed, dissolves in the water, and then returns to the system. When the pressure in storage tank A1 drops to 0.02 MPa, the gas return ends and valve 825 is closed.

[0040] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A storage device for the staged recovery of hydrogen sulfide solution in a chemical system, characterized in that, It includes storage tank A, storage tank B, storage tank C, primary feed pipeline, secondary feed pipeline, primary liquid phase recovery pipeline, secondary liquid phase recovery pipeline and gas phase recovery pipeline. The primary feed pipeline and primary liquid phase recovery pipeline are connected to storage tank B and storage tank C respectively. The secondary feed pipeline and secondary liquid phase recovery pipeline are connected to storage tank A respectively. The gas phase recovery pipeline is connected to storage tank A, storage tank B and storage tank C respectively.

2. The storage device for graded recovery of hydrogen sulfide solution in a chemical system according to claim 1, characterized in that, The storage tanks A, B and C are equipped with level gauges and pressure gauges.

3. The storage device for graded recovery of hydrogen sulfide solution in a chemical system according to claim 1, characterized in that, The primary feed pipeline is connected to storage tank B and storage tank C respectively via feed branch pipes. Valve 1 is installed on the primary feed pipeline, and valve 2 is installed on the feed branch pipe.

4. The storage device for graded recovery of hydrogen sulfide solution in a chemical system according to claim 1, characterized in that, The primary liquid phase recovery pipeline is connected to storage tank B and storage tank C respectively through the discharge branch pipe. The primary liquid phase recovery pipeline is equipped with valve three and reflux pump one, and valve four is installed on the discharge branch pipe.

5. The storage device for graded recovery of hydrogen sulfide solution in a chemical system according to claim 1, characterized in that, The secondary feed pipeline is equipped with valve five, and the secondary liquid phase recovery pipeline is equipped with valve six and reflux pump two.

6. The storage device for graded recovery of hydrogen sulfide solution in a chemical system according to claim 1, characterized in that, Sampling lines are installed on the primary liquid phase recovery pipeline and the secondary liquid phase recovery pipeline, and valve seven is installed on the sampling lines.

7. The storage device for graded recovery of hydrogen sulfide solution in a chemical system according to claim 1, characterized in that, The gas phase recovery pipeline is connected to storage tanks A, B and C respectively via gas phase branch pipes. The end of the gas phase recovery pipeline is connected to a water tank. Valve 8 is installed on the gas phase recovery pipeline and valve 9 is installed on the gas phase branch pipe.

8. The storage device for graded recovery of hydrogen sulfide solution in a chemical system according to claim 7, characterized in that, The gas phase recovery pipeline is also connected to a vent pipeline, and a valve is installed on the vent pipeline.

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