An automated sulfur injection system

Abstract

The utility model relates to the technical field of chemical production safety, concretely relates to an automatic sulfur injection system, including sulfur injection tank and data analysis processing system, the sulfur injection tank bottom is connected with sulfur injection pipeline, is provided with sulfur injection pump on the sulfur injection pipeline, the sulfur injection pipeline is connected on the feed pipeline away from the sulfur injection tank one end, the feed pipeline conveying end is connected with feed heat exchanger, the feed heat exchanger is connected with heating furnace and reactor in proper order, the reactor's discharge port is connected back with feed heat exchanger, the feed pipeline is connected with sampling pipeline and back sample pipeline, the sampling pipeline and back sample pipeline end all link to each other with sulfur content detector, sulfur content detector and data analysis processing system electric connection, the utility model solves the many drawbacks of traditional manual sulfur injection mode, and has the multiple value of 'improving production efficiency, reducing operating cost, guaranteeing production safety'.

Description

Technical Field

[0001] This utility model relates to the field of chemical production safety technology, specifically to an automated sulfur injection system. Background Technology

[0002] In organic synthesis fields such as fine chemical preparation, the activity and stability of catalysts directly determine reaction efficiency, product purity, and production costs. Precise control of the sulfur content in the reaction system is crucial for maintaining catalyst performance and ensuring safe reactor operation. Dimethyl disulfide (DMDS) is mainly used as a catalyst passivator and sulfiding agent, including: 1. Inhibiting the hydrogenolysis activity of rhenium in platinum-rhenium catalysts, reducing carbon deposition, and improving catalyst stability; 2. Converting oxidized catalysts to sulfidized states, enhancing activity, and delaying carbon deposition and deactivation; 3. Reducing carbide deposition on furnace tubes and reactor walls at high temperatures by sulfiding metal surfaces, ensuring equipment operating efficiency. Therefore, in typical organic synthesis reactions such as hydrogenation reduction and cross-coupling, the amount of DMDS added must be strictly controlled to meet the process requirement of "maintaining the catalyst activity threshold" while avoiding product sulfur contamination due to excessive addition or catalyst deactivation and coking on the reactor inner wall due to insufficient addition.

[0003] In current industrial production, the control of DMDS sulfur injection generally relies on the traditional model of "manual sampling - laboratory testing - lag adjustment". The specific process is as follows: the operator collects the feed oil sample through the manual sampling port on the reactor feed pipeline. The oil sample is sent to the laboratory for sulfur content testing. After the laboratory issues the test report, the operator manually adjusts the flow rate of the DMDS sulfur injection pump according to the deviation between the target sulfur content and the actual test value, so as to maintain the stability of the sulfur content in the reaction system.

[0004] However, this control mode, which relies on manual operation, has many drawbacks and is gradually failing to meet the modern organic synthesis's production requirements of "high efficiency, precision, and stability." Specific problems include: the sulfur content of the feed oil is often dynamically fluctuating due to factors such as raw material batches, pretreatment processes, and adsorption in the delivery pipeline. In the traditional mode, a significant amount of time is required from sampling to completing testing and adjusting the sulfur injection amount. During this time, the sulfur content of the reaction system may have changed significantly. The sulfur injection adjustments made by operators based on "lagging data" cannot match the current reaction requirements in a timely manner, causing the reaction system to be in a long-term cycle of "high sulfur content - low sulfur content - readjustment," affecting the catalyst's activity and lifespan, thus severely impacting production efficiency. Furthermore, the traditional mode requires operators to take multiple samples throughout the day, significantly increasing their workload and introducing additional burdens in terms of time allocation, physical exertion, and operational risks, seriously affecting work efficiency and operational safety. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides an automated sulfur injection system.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: an automated sulfur injection system, comprising a sulfur injection tank and a data analysis and processing system. A sulfur injection pipe is connected to the bottom of the sulfur injection tank, and a sulfur injection pump is installed on the sulfur injection pipe. The end of the sulfur injection pipe furthest from the sulfur injection tank is connected to a feed pipe. A feed heat exchanger is connected to the end of the feed pipe, and a heating furnace and a reactor are sequentially connected to the feed heat exchanger. The outlet of the reactor is reflux-connected to the feed heat exchanger. A sampling pipe and a return sampling pipe are connected to the feed pipe, and the ends of both the sampling pipe and the return sampling pipe are connected to a sulfur content detector. The sulfur content detector is electrically connected to the data analysis and processing system.

[0007] Furthermore, the sulfur injection tank is equipped with an electronic level gauge, which is electrically connected to the data analysis and processing system.

[0008] Furthermore, a sulfur replenishment pipe is provided on the top of the sulfur injection tank, and a sulfur replenishment valve is provided on the sulfur replenishment pipe.

[0009] Furthermore, an electronic flow meter is installed at the outlet end of the sulfur injection pump, and the electronic flow meter is electrically connected to the data analysis and processing system.

[0010] Furthermore, a feed valve is installed on the feed pipe.

[0011] Furthermore, a sampling valve and a venting valve are sequentially installed on the sampling pipeline.

[0012] Furthermore, a return valve is installed on the return pipeline.

[0013] Furthermore, the heating furnace includes a first heating furnace, a second heating furnace, a third heating furnace, and a fourth heating furnace; the reactor includes a first reactor, a second reactor, a third reactor, and a fourth reactor arranged sequentially from top to bottom; the outlet of the feed heat exchanger is sequentially connected to the first heating furnace, the first reactor, the second heating furnace, the second reactor, the third heating furnace, the third reactor, the fourth heating furnace, and the fourth reactor.

[0014] The beneficial effects achieved by this utility model are as follows:

[0015] 1. The sampling pipeline, return pipeline and sulfur content detector of this utility model form a closed loop, eliminating the need for manual sample collection. The detection process is fully automated, and the tested oil is returned to the feed pipeline to avoid material waste. The data analysis and processing system automatically compares the sulfur content data, calculates the deviation and issues adjustment instructions to the sulfur injection pump, replacing manual experience judgment, ensuring the accuracy of operation, ensuring the smooth progress of the reaction and extending the service life of the catalyst.

[0016] 2. This utility model's electronic level gauge monitors the sulfur injection tank level in real time. When the level is low, the system automatically opens the sulfur replenishment valve to replenish the material, ensuring that the sulfur injection tank level is maintained within a safe range and preventing sulfur injection interruptions due to insufficient DMDS. No manual supervision is required to add DMDS. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] The markings in the diagram are as follows: 1. Sulfur injection tank; 2. Sulfur injection pump; 3. Electronic flow meter; 4. Sulfur content detector; 5. Feed heat exchanger; 6. Data analysis and processing system; 7. Feed pipeline; 8. Sampling pipeline; 9. Return sampling pipeline; 10. Sulfur injection pipeline; 11. Heating furnace; 12. Reactor; 13. Sulfur replenishment pipeline; 101. Electronic level gauge; 701. Feed valve; 801. Sampling valve; 802. Vent valve; 901. Return sampling valve; 1101. First heating furnace; 1102. Second heating furnace; 1103. Third heating furnace; 1104. Fourth heating furnace; 1201. First reactor; 1202. Second reactor; 1203. Third reactor; 1204. Fourth reactor. Detailed Implementation

[0019] To better understand the purpose, structure, and function of this utility model, the following description, in conjunction with the accompanying drawings, provides a more detailed account of an automated sulfur injection system of this utility model.

[0020] like Figure 1 As shown, an automated sulfur injection system includes a sulfur injection tank 1 and a data analysis and processing system 6. The bottom of the sulfur injection tank 1 is connected to a sulfur injection pipe 10. A sulfur injection pump 2 and an electronic flow meter 3 are sequentially installed on the sulfur injection pipe 10. The other end of the sulfur injection pipe 10 is connected to a feed pipe 7. The end of the feed pipe 7 is connected to a feed heat exchanger 5. The feed heat exchanger 5 is sequentially connected to a heating furnace 11 and a reactor 12. The outlet of the reactor 12 is reconnected to the feed heat exchanger 5.

[0021] A return sampling port and a sampling port are sequentially arranged on the feed pipe 7 from the feed end to the feed heat exchanger 5. A sampling pipe 8 is connected to the sampling port. A sulfur content detector 4 is connected to the end of the sampling pipe 8. The other end of the sulfur content detector 4 is connected to a return sampling pipe 9. The return sampling pipe 9 is connected to the return sampling port on the feed pipe 7. A sampling valve 801 and a venting valve 802 are sequentially arranged on the sampling pipe 8. A return sampling valve 901 is arranged on the return sampling pipe 9. A feed valve 701 is arranged on the feed pipe 7. The feed valve 701 is located between the connection port of the sulfur injection pipe 10 and the feed pipe 7 and the return sampling port.

[0022] An electronic level gauge 101 is installed on one side of the sulfur injection tank 1. The electronic level gauge 101 can monitor the DMDS level in the sulfur injection tank 1 in real time. A sulfur replenishment pipe 13 is installed on the top of the sulfur injection tank 1. A sulfur replenishment valve is installed on the sulfur replenishment pipe 13 to control the opening and closing of the sulfur replenishment pipe 13. When the electronic level gauge 101 shows that the DMDS level in the sulfur injection tank 1 is insufficient, the sulfur replenishment pipe 13 adds DMDS to the sulfur injection tank 1 to ensure the smooth progress of the reaction in the reactor 12.

[0023] The data analysis and processing system 6 is electrically connected to the electronic flow meter 3, the sulfur content detector 4, the sulfur injection pump 2, and the electronic level gauge 101. The sulfur content detector 4 detects the sulfur content in the feed and feeds the sulfur content information back to the data analysis and processing system 6. The data analysis and processing system 6 controls the flow rate of the sulfur injection pump 2 based on the sulfur content result and monitors the flow rate of the sulfur injection pump 2 through the electronic flow meter 3. When the DMDS in the sulfur injection tank 1 is insufficient, the electronic level gauge 101 feeds back the corresponding electrical signal to the data analysis and processing system 6. The data analysis and processing system 6 controls the sulfur replenishment valve on the sulfur replenishment pipeline 13 to open and add DMDS to the sulfur injection tank 1.

[0024] Heating furnace 11 includes a first heating furnace 1101, a second heating furnace 1102, a third heating furnace 1103, and a fourth heating furnace 1104; reactor 12 includes a first reactor 1201, a second reactor 1202, a third reactor 1203, and a fourth reactor 1204 arranged sequentially from top to bottom. The outlet of feed heat exchanger 5 is sequentially connected to the first heating furnace 1101, the first reactor 1201, the second heating furnace 1102, the second reactor 1202, the third heating furnace 1103, the third reactor 1203, the fourth heating furnace 1104, and the fourth reactor 1204, with the final return flow from the fourth reactor 1204 to the feed heat exchanger 5. Since the reforming reaction is a strongly endothermic reaction, the temperature of the reactants continuously decreases during the reaction. To ensure the reaction proceeds fully, four reactors and four heating furnaces are set up for relay heating to guarantee the smooth progress of the reaction.

[0025] The working process of this utility model is as follows:

[0026] Before system startup, the operator sets the target sulfur content required for the reaction, the initial flow rate of the sulfur injection pump 2, and the upper and lower limits of the liquid level in the sulfur injection tank 1 via the touch screen of the data analysis and processing system 6. Then, the feed valve 701 is opened, and the feed pipeline 7 begins to transport the raw material oil; at the same time, it is confirmed that the sampling valve 801 and the return sampling valve 901 are in the open state, and the vent valve 802 is in the closed state to ensure that the sampling and detection circuit is unobstructed.

[0027] When the raw oil flows in the feed pipe 7, a portion of the oil enters the sampling pipe 8 through the sampling port, then flows sequentially through the sampling valve 801 before entering the sulfur content analyzer 4. The sulfur content analyzer 4 performs real-time sulfur content analysis on the oil. After the analysis is completed, the oil is returned to the feed pipe 7 through the return pipe 9 and the return valve 901, realizing a "sampling-analysis-return" cycle to avoid raw material waste. The sulfur content data obtained from the analysis is transmitted to the data analysis and processing system 6 in real time via an electrical connection.

[0028] After receiving the sulfur content detection data, the data analysis and processing system 6 immediately compares it with the preset target sulfur content to calculate the deviation value. Based on the built-in algorithm of "deviation value - sulfur injection rate" (e.g., for every positive deviation of 0.1 ppm, the sulfur injection rate decreases by 0.1 L / h), the system automatically generates a control command, sending a frequency conversion adjustment signal to the sulfur injection pump 2 to reduce its flow rate. The electronic flow meter 3 on the sulfur injection pipeline 10 monitors the adjusted sulfur injection flow rate in real time and feeds the data back to the data analysis and processing system 6, forming a closed-loop verification—if the feedback flow rate matches the target flow rate, the system maintains the current parameters; if a deviation exists, the frequency of the sulfur injection pump 2 is fine-tuned again until the flow rate accurately matches the requirements.

[0029] The electronic level gauge 101 on the outside of the sulfur injection tank 1 monitors the DMDS level changes inside the tank in real time and continuously transmits the level data to the data analysis and processing system 6. When the level drops to the lower limit, the system determines that "material is insufficient" and immediately issues an opening command to the sulfur replenishment valve on the sulfur replenishment pipeline 13. The external DMDS storage tank replenishes material to the sulfur injection tank 1 through the sulfur replenishment pipeline 13. As replenishment proceeds, when the electronic level gauge 101 detects that the level has risen to the upper limit, the system issues a closing command, the sulfur replenishment valve automatically closes, and replenishment stops, ensuring that the sulfur injection process is continuous and uninterrupted.

[0030] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. An automated sulfur injection system, characterized in that: The system includes a sulfur injection tank (1) and a data analysis and processing system (6). The bottom of the sulfur injection tank (1) is connected to a sulfur injection pipe (10), and a sulfur injection pump (2) is installed on the sulfur injection pipe (10). The end of the sulfur injection pipe (10) away from the sulfur injection tank (1) is connected to a feed pipe (7). The feed pipe (7) is connected to a feed heat exchanger (5) at its delivery end. The feed heat exchanger (5) is connected to a heating furnace (11) and a reactor (12) in sequence. The outlet of the reactor (12) is connected to the feed heat exchanger (5) for reflux. The feed pipe (7) is connected to a sampling pipe (8) and a return sampling pipe (9). The ends of the sampling pipe (8) and the return sampling pipe (9) are both connected to a sulfur content detector (4). The sulfur content detector (4) is electrically connected to the data analysis and processing system (6).

2. The automated sulfur injection system according to claim 1, characterized in that: The sulfur injection tank (1) is equipped with an electronic level gauge (101), which is electrically connected to the data analysis and processing system (6).

3. The automated sulfur injection system according to claim 1, characterized in that: The sulfur injection tank (1) is equipped with a sulfur replenishment pipe (13) at the top, and a sulfur replenishment valve is provided on the sulfur replenishment pipe (13).

4. The automated sulfur injection system according to claim 1, characterized in that: The outlet end of the sulfur injection pump (2) is equipped with an electronic flow meter (3), which is electrically connected to the data analysis and processing system (6).

5. An automated sulfur injection system according to claim 1, characterized in that: A feed valve (701) is installed on the feed pipe (7).

6. An automated sulfur injection system according to claim 1, characterized in that: The sampling pipeline (8) is provided with a sampling valve (801) and a vent valve (802) in sequence.

7. An automated sulfur injection system according to claim 1, characterized in that: A return valve (901) is installed on the return pipe (9).

8. An automated sulfur injection system according to claim 1, characterized in that: The heating furnace (11) includes a first heating furnace (1101), a second heating furnace (1102), a third heating furnace (1103), and a fourth heating furnace (1104); the reactor (12) includes a first reactor (1201), a second reactor (1202), a third reactor (1203), and a fourth reactor (1204) arranged sequentially from top to bottom; the outlet of the feed heat exchanger (5) is sequentially connected to the first heating furnace (1101), the first reactor (1201), the second heating furnace (1102), the second reactor (1202), the third heating furnace (1103), the third reactor (1203), the fourth heating furnace (1104), and the fourth reactor (1204).

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