A claus tail gas delivery system

Abstract

The application relates to the tail gas conveying technical field and provides a Claus tail gas conveying system, which comprises a tail gas pipeline, a washing tower, a sulfur separator A and a sulfur separator B. One end of the tail gas pipeline is connected with the washing tower, and the other end of the tail gas pipeline is connected with the sulfur separator A and the sulfur separator B. A sulfur discharge pipe and a first H2S / SO2 online analyzer are arranged on the tail gas pipeline. The sulfur discharge pipe is located between the sulfur separator A and the sulfur separator B, and the first H2S / SO2 online analyzer is located between the sulfur separator A and the washing tower. According to the application, the sulfur discharge pipe is arranged at the low point of the tail gas pipeline. In the tail gas conveying process, liquid sulfur can be used to discharge the accumulated sulfur in the tail gas pipeline, so that the tail gas conveying is smooth, the tail gas pipeline blockage frequency is reduced, and the operation life of a single Claus system is prolonged.

Description

Technical Field

[0001] This application relates to the field of exhaust gas delivery technology, and more specifically, to a Claus exhaust gas delivery system. Background Technology

[0002] During the coking process, some of the sulfur in the coal enters the raw coal gas. If these sulfur-containing gases are emitted directly without treatment, they will cause serious environmental pollution, corrode equipment, and affect the subsequent steel smelting process and product quality. Therefore, desulfurization treatment must be carried out before they are sent to steel plants or used as city gas.

[0003] The Claus furnace works by converting sulfides into elemental sulfur through a chemical reaction. Specifically, acidic gases (mainly containing hydrogen sulfide) first undergo incomplete combustion with air or oxygen in the combustion furnace to produce sulfur dioxide and water vapor. Under the action of a catalyst, the sulfur dioxide reacts with the remaining hydrogen sulfide in the Claus reactor to produce sulfur and water. This process can significantly reduce sulfide emissions.

[0004] like Figure 1 As shown, before the modification, the coke oven gas primary desulfurization and recovery system had two Claus furnace systems. The two Claus furnace systems (A Claus furnace and B Claus furnace) shared a tail gas pipeline 1, which was designed to be located at a low position. The H2S / SO2 online analyzer 6 was installed on the tail gas pipeline 1. During normal production, one Claus furnace system was in operation and the other was on standby. The tail gas from the Claus furnace was separated by sulfur separator A or sulfur separator B and then entered the interior of the tail gas pipeline 1. During use, when sulfur separator A3 / or sulfur separator B4 could not separate the tail gas from sulfur completely, liquid sulfur was prone to accumulate inside the tail gas pipeline 1. The accumulation of liquid sulfur would increase the resistance of the Claus system, and in severe cases, it would cause the system to shut down. The accumulation of liquid sulfur would also submerge the sampling tube of the H2S / SO2 online analyzer 6, causing the H2S / SO2 online analyzer 6 to be unable to sample, ultimately affecting the air volume ratio of the Claus furnace and causing the hydrogen sulfide content of the gas after the desulfurization tower to increase. Utility Model Content

[0005] The purpose of this application is to provide a Claus exhaust gas delivery system that, by modifying existing exhaust gas pipelines, ensures smooth exhaust gas delivery, reduces the frequency of exhaust gas pipeline blockage, and extends the service life of a single Claus system.

[0006] This application provides a Claus exhaust gas delivery system, which adopts the following technical solution:

[0007] A Claus exhaust gas delivery system includes an exhaust gas pipeline, a scrubbing tower, a sulfur separator A, and a sulfur separator B. One end of the exhaust gas pipeline is connected to the scrubbing tower, and the other end of the exhaust gas pipeline is connected to the sulfur separator A and the sulfur separator B.

[0008] The exhaust gas pipeline is equipped with a sulfur discharge pipe and a first H2S / SO2 online analyzer. The sulfur discharge pipe is located between the sulfur separator A and the sulfur separator B, and the first H2S / SO2 online analyzer is located between the sulfur separator A and the scrubbing tower.

[0009] Preferably, the exhaust gas pipeline is provided with a branch pipeline, the two ends of which are respectively connected to the exhaust gas pipeline. The branch pipeline is provided with a second H2S / SO2 online analyzer and two first control valves. The second H2S / SO2 online analyzer is located between the two first control valves. The exhaust gas pipeline is provided with two second control valves, one of which is located between sulfur separator A and sulfur separator B, and the other of which is located between sulfur separator A and the scrubbing tower.

[0010] Preferably, a first tee pipe is provided between one end of the branch pipe and the exhaust gas pipe, the first tee pipe is connected to the sulfur separator B, and a second tee pipe is provided between the other end of the branch pipe and the exhaust gas pipe.

[0011] Preferably, the branch pipe includes a first ascending section, a first horizontal section, and a descending section. The lower end of the first ascending section is connected to the first tee pipe, and the upper end of the first ascending section is connected to the first horizontal section. The second H2S / SO2 online analyzer is located in the first horizontal section.

[0012] Preferably, the exhaust gas pipeline includes a second horizontal section, a second rising section, and a third horizontal section. The second horizontal section connects sulfur separator A and sulfur separator B. The first H2S / SO2 online analyzer is located in the second horizontal section. The lower end of the second rising section is connected to the second horizontal section, and the upper end of the second rising section is connected to the second tee pipe. One end of the third horizontal section is connected to the second tee pipe, and the other end of the third horizontal section is connected to the scrubbing tower.

[0013] Preferably, a third control valve is provided on the exhaust gas pipe, and the third control valve is located in the third horizontal section.

[0014] Compared with the prior art, the beneficial effects of this application are as follows:

[0015] This application arranges a sulfur discharge pipe at the low point of the exhaust gas pipeline. During the exhaust gas transportation process, liquid sulfur can be used to discharge the sulfur accumulated inside the exhaust gas pipeline by gravity, thereby ensuring smooth exhaust gas transportation, reducing the frequency of exhaust gas pipeline blockage, and extending the service life of the single Claus system. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a Claus exhaust gas delivery system in the prior art;

[0018] Figure 2 This is a schematic diagram of the structure of this utility model.

[0019] The reference numerals in the attached figures are as follows:

[0020] 1. Exhaust gas pipeline; 2. Scrubber tower; 3. Sulfur separator A; 4. Sulfur separator B; 5. Sulfur discharge pipe; 6. First H2S / SO2 online analyzer; 7. Branch pipeline; 8. Second H2S / SO2 online analyzer; 9. First control valve; 10. Second control valve; 11. First tee pipe; 12. Second tee pipe; 13. First rising section; 14. First horizontal section; 15. Falling section; 16. Second horizontal section; 17. Second rising section; 18. Third horizontal section; 19. Third control valve; 20. Sulfur sealing tank A; 21. Sulfur sealing tank B. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application 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 this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[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 application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., 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 of this application is in use. They are only for the convenience of describing this application 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 on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "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 application based on the specific circumstances.

[0027] Example

[0028] like Figure 1 and Figure 2 As shown in the embodiment of this application, the Claus tail gas conveying system includes a tail gas pipeline 1, a scrubbing tower 2, a sulfur separator A3, and a sulfur separator B4. One end of the tail gas pipeline 1 is connected to the scrubbing tower 2, and the other end of the tail gas pipeline 1 is connected to the sulfur separator A3 and the sulfur separator B4. The sulfur in the sulfur separator A3 is discharged into the sulfur sealing tank A20 through the pipeline, and the sulfur in the sulfur separator B4 is discharged into the sulfur sealing tank B21 through the pipeline. A sulfur discharge pipe 5 and a first H2S / SO2 online analyzer 6 are installed on the tail gas pipeline 1. The sulfur discharge pipe 5 is located between the sulfur separator A3 and the sulfur separator B4, and the lower end of the sulfur discharge pipe 5 is connected to the sulfur sealing tank B21. The first H2S / SO2 online analyzer 6 is located between the sulfur separator A3 and the scrubbing tower 2.

[0029] During the tail gas transportation process, liquid sulfur can be used to discharge the sulfur accumulated inside the tail gas pipeline 1 by gravity flow to ensure smooth tail gas transportation, thereby reducing the frequency of tail gas pipeline 1 blockage and extending the service life of the single Claus system. During the tail gas transportation process, the first H2S / SO2 online analyzer 6 samples and analyzes the tail gas to ensure the accuracy of the Claus furnace air ratio, making the hydrogen sulfide content in the gas after the desulfurization tower more controllable and ensuring the quality of coke oven gas.

[0030] In this embodiment, a branch pipe 7 is provided on the exhaust gas pipe 1. The two ends of the branch pipe 7 are respectively connected to the exhaust gas pipe 1. A second H2S / SO2 online analyzer 8 and two first control valves 9 are provided on the branch pipe 7. The second H2S / SO2 online analyzer 8 is located between the two first control valves 9. Two second control valves 10 are provided on the exhaust gas pipe 1. One second control valve 10 is located between sulfur separator A3 and sulfur separator B4, and the other second control valve 10 is located between sulfur separator A3 and scrubbing tower 2.

[0031] During normal production, the Claus furnace system operates with one furnace on standby. When the Claus A furnace system is working, the first control valve 9 is closed and the second control valve 10 is opened. At this time, the Claus B furnace system stops working, and the sulfur separator B4 is blocked, ensuring safety during maintenance of the Claus B furnace system and the sulfur separator B4. After the sulfur separator A3 desulfurizes the tail gas, the tail gas is transported to the scrubbing tower 2 through the tail gas pipeline 1. When the Claus B furnace system is working, the first control valve 9 is opened and the second control valve 10 is closed. At this time, the Claus A furnace system stops working, and the sulfur separator A3 is blocked, ensuring safety during maintenance of the Claus A furnace system and the sulfur separator A3. After the sulfur separator B4 desulfurizes the tail gas, the gas enters the interior of the branch pipeline 7. The branch pipeline 7 transports the tail gas to the end of the tail gas pipeline 1 near the scrubbing tower 2. The tail gas pipeline 1 then transports the tail gas into the interior of the scrubbing tower 2.

[0032] In this embodiment, a first tee pipe 11 is provided between one end of the branch pipe 7 and the tail gas pipe 1, and the first tee pipe 11 is connected to the sulfur separator B4. A second tee pipe 12 is provided between the other end of the branch pipe 7 and the tail gas pipe 1.

[0033] In this embodiment, the branch pipe 7 includes a first ascending section 13, a first horizontal section 14, and a descending section 15. The lower end of the first ascending section 13 is connected to the first tee pipe 11, and the upper end of the first ascending section 13 is connected to the first horizontal section 14. The second H2S / SO2 online analyzer 8 is located in the first horizontal section 14. Since the first horizontal section 14 is arranged at a high position, liquid sulfur will not accumulate in the first horizontal section 14, thereby ensuring that the second H2S / SO2 online analyzer 8 can sample the exhaust gas normally.

[0034] In this embodiment, the exhaust gas pipeline 1 includes a second horizontal section 16, a second rising section 17, and a third horizontal section 18. The second horizontal section 16 is connected to sulfur separator A3 and sulfur separator B4. The first H2S / SO2 online analyzer 6 is located in the second horizontal section 16. The lower end of the second rising section 17 is connected to the second horizontal section 16, and the upper end of the second rising section 17 is connected to the second tee pipe 12. One end of the third horizontal section 18 is connected to the second tee pipe 12, and the other end of the third horizontal section 18 is connected to the scrubbing tower 2.

[0035] In this embodiment, a third control valve 19 is provided on the exhaust pipe 1, and the third control valve 19 is located in the third horizontal section 18.

[0036] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A Claus exhaust gas delivery system, characterized in that: It includes an exhaust gas pipeline, a scrubbing tower, sulfur separator A and sulfur separator B, with one end of the exhaust gas pipeline connected to the scrubbing tower and the other end of the exhaust gas pipeline connected to sulfur separator A and sulfur separator B; The exhaust gas pipeline is equipped with a sulfur discharge pipe and a first H2S / SO2 online analyzer. The sulfur discharge pipe is located between the sulfur separator A and the sulfur separator B, and the first H2S / SO2 online analyzer is located between the sulfur separator A and the scrubbing tower.

2. The Claus exhaust gas delivery system according to claim 1, characterized in that: The exhaust gas pipeline is provided with a branch pipeline, the two ends of which are respectively connected to the exhaust gas pipeline. A second H2S / SO2 online analyzer and two first control valves are provided on the branch pipeline. The second H2S / SO2 online analyzer is located between the two first control valves. The exhaust gas pipeline is provided with two second control valves. One second control valve is located between sulfur separator A and sulfur separator B, and the other second control valve is located between sulfur separator A and the scrubbing tower.

3. A Claus exhaust gas delivery system according to claim 2, characterized in that: A first tee pipe is provided between one end of the branch pipe and the tail gas pipe, and the first tee pipe is connected to the sulfur separator B. A second tee pipe is provided between the other end of the branch pipe and the tail gas pipe.

4. A Claus exhaust gas delivery system according to claim 3, characterized in that: The branch pipeline includes a first ascending section, a first horizontal section, and a descending section. The lower end of the first ascending section is connected to the first tee pipe, and the upper end of the first ascending section is connected to the first horizontal section. The second H2S / SO2 online analyzer is located in the first horizontal section.

5. A Claus exhaust gas delivery system according to claim 3 or 4, characterized in that: The exhaust gas pipeline includes a second horizontal section, a second rising section, and a third horizontal section. The second horizontal section connects sulfur separator A and sulfur separator B. The first H2S / SO2 online analyzer is located in the second horizontal section. The lower end of the second rising section is connected to the second horizontal section, and the upper end of the second rising section is connected to the second tee pipe. One end of the third horizontal section is connected to the second tee pipe, and the other end of the third horizontal section is connected to the scrubbing tower.

6. A Claus exhaust gas delivery system according to claim 5, characterized in that: A third control valve is installed on the exhaust pipe, and the third control valve is located in the third horizontal section.

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