A method for realizing sulfur sealing by utilizing the density difference between liquid sulfur and process gas

Abstract

A method for realizing sulfur sealing by utilizing the density difference between liquid sulfur and process gas belongs to the technical field of sulfur recovery equipment. A sealing component separates the inner cavity of the sulfur sealing tank body into a gas phase area and a liquid phase area. The separation component is arranged between the liquid sulfur inlet and the liquid sulfur outlet of the sulfur sealing tank body, and both the liquid sulfur inlet and the liquid sulfur outlet are connected to the liquid phase area; the gas phase area of ​​the sulfur sealing tank body is connected to the condenser gas phase outlet of the condenser of the sulfur equipment, and the condenser liquid phase outlet of the condenser is connected to the liquid sulfur inlet of the sulfur sealing tank body; the pressure of the condenser gas phase outlet is equal to the pressure of the gas phase area, so that the sealing component presses the separation component and closes the flow channel on the separation component. The pressure on both sides of the sealing component of the present invention is equal, so the sealing component will maintain the state of closing the flow channel, and the process gas cannot enter the liquid sulfur pool. When the liquid sulfur flows into the sulfur sealing tank body, the liquid sulfur will push the sealing component to open the flow channel, so that the liquid sulfur can flow smoothly into the liquid sulfur pool.

Description

Technical Field

[0001] The invention discloses a method for realizing sulfur sealing by utilizing the density difference between liquid sulfur and process gas, belonging to the technical field of sulfur recovery equipment. Background Art

[0002] At present, sulfur devices basically use traditional sulfur sealing tanks to prevent process gas from entering the liquid sulfur pool along with liquid sulfur. The design pressure of the sulfur device is about 30-70KPa, and the pressure of the liquid sulfur pool is normal pressure or slightly negative pressure. In order to prevent the process gas of the sulfur device system from entering the liquid sulfur pool, a traditional sulfur sealing tank is installed on each liquid sulfur line from the liquid phase outlet of the condenser to the liquid sulfur pool to prevent the process gas of the sulfur device from entering the liquid sulfur pool.

[0003] Sulfur enters the sulfur seal tank from the liquid phase outlet of the condenser, and finally flows out from the liquid sulfur outlet on the upper part of the tank into the liquid sulfur pool. When the static pressure of the tank is filled with liquid sulfur is greater than the system pressure of the sulfur device, the process gas of the sulfur device system is sealed at the liquid sulfur inlet side of the sulfur seal tank, so that the process gas of the sulfur device does not flow into the liquid sulfur pool.

[0004] From the working principle of the sulfur seal tank, it can be known that only when the static pressure of the liquid sulfur in the tank body is greater than the system pressure of the device, the process gas cannot enter the liquid sulfur pool, otherwise the process gas will break through the sulfur seal of the sulfur seal tank and enter the liquid sulfur pool. This requires that the static pressure of the liquid sulfur in the sulfur seal tank should be greater than the system pressure of the sulfur device, that is, the sulfur seal tank body needs a certain height. In order to ensure that the liquid sulfur of the sulfur device can smoothly flow into the liquid sulfur pool through the sulfur seal tank, there is a certain height difference between the liquid phase outlet height of the condenser of the device and the liquid sulfur outlet of the sulfur seal tank. In order to meet this requirement, the measure is to place the sulfur seal tank in an underground tank or raise the sulfur-making part of the entire sulfur device. This brings two disadvantages: first, placing the sulfur seal tank underground will make it difficult to repair the sulfur seal tank; second, raising the sulfur-making part of the device will increase the investment in the sulfur device.

[0005] Since the traditional sulfur seal tank uses the static pressure generated by liquid sulfur at the height of the traditional sulfur seal tank to be greater than the system pressure of the sulfur device, it is used to prevent the process gas of the sulfur device from entering the liquid sulfur pool along with the liquid sulfur. Due to the limitation of the height of the traditional sulfur seal tank, it is impossible to prevent the higher pressure process gas from entering the liquid sulfur pool along with the liquid sulfur. This is the fundamental reason why the design production pressure of the sulfur device (30-70KPA) is relatively low. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a method for achieving sulfur sealing by utilizing the density difference between liquid sulfur and process gas, which can prevent the process gas from entering the liquid sulfur pool due to excessive pressure in the sulfur device system, thereby avoiding environmental pollution and safety accidents.

[0007] The technical solution adopted by the present invention to solve the technical problem is: the method for realizing sulfur sealing by utilizing the density difference between liquid sulfur and process gas comprises: a sealing component and a partitioning component are arranged inside a sulfur sealing tank body, the sealing component is sealedly connected to the inner wall of the sulfur sealing tank body, and the inner cavity of the sulfur sealing tank body is divided into a gas phase area and a liquid phase area, the partitioning component is arranged between the liquid sulfur inlet and the liquid sulfur outlet of the sulfur sealing tank body, a flow channel is arranged on the partitioning component, and the liquid sulfur inlet and the liquid sulfur outlet are both connected to the liquid phase area;

[0008] The gas phase area of ​​the sulfur sealing tank body is connected to the condenser gas phase outlet of the condenser of the sulfur equipment, and the condenser liquid phase outlet of the condenser is connected to the liquid sulfur inlet of the sulfur sealing tank body;

[0009] The pressure of the gas phase outlet of the condenser is equal to the pressure of the gas phase zone, so that the sealing component maintains the state of closing the flow channel on the partition component;

[0010] The liquid sulfur condensed in the condenser enters the liquid phase region and pushes the sealing component to open the flow channel of the partition component.

[0011] Preferably, the liquid sulfur outlet is arranged in the middle of the sulfur sealing tank body, and the liquid sulfur inlet is arranged at the bottom of the sulfur sealing tank body.

[0012] Preferably, the partition assembly comprises a partition, the partition is sealed and connected to the inner wall of the sulfur sealing tank body, and the flow channel is arranged in the middle of the partition.

[0013] Preferably, the sealing assembly comprises an elastic diaphragm, which is fixedly connected to the inner wall of the sulfur sealing tank body and is sealed.

[0014] Preferably, the elastic diaphragm and the partition are spaced apart from each other, and a liquid sulfur buffer zone is formed between the elastic diaphragm and the partition zone, and the liquid sulfur outlet is connected to the liquid sulfur buffer zone.

[0015] Preferably, there are several liquid sulfur outlets.

[0016] Preferably, the liquid phase outlet of the condenser is located at the bottom of the condenser, the gas phase outlet of the condenser is located at the top of the condenser, and the liquid phase outlet of the condenser is connected to the gas phase outlet of the condenser.

[0017] Preferably, the condenser is arranged higher than the sulfur sealing tank body, and utilizes the static pressure generated by the height difference of liquid sulfur to push the sealing assembly.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] When the method of realizing sulfur sealing by utilizing the density difference between liquid sulfur and process gas is used, the pressure on both sides of the sealing component is equal, so the sealing component will maintain the state of closing the flow channel, and the process gas cannot enter the liquid sulfur pool to pollute the liquid sulfur. When the liquid sulfur flows into the sulfur sealing tank body, the liquid sulfur will push the sealing component to open the flow channel, so that the liquid sulfur can smoothly flow into the liquid sulfur pool.

[0020] The method of achieving sulfur sealing by utilizing the density difference between liquid sulfur and process gas is not affected by changes in the system pressure of the sulfur device, thereby preventing safety and environmental accidents caused by the process gas breaking through the sulfur seal and entering the liquid sulfur pool due to a sudden increase in the system pressure of the sulfur device in the traditional sulfur sealing tank; sulfur sealing can be achieved under higher sulfur system pressure; the new sulfur sealing equipment developed using this method is generally small in size, low in investment, and easy to inspect and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the connection between the sulfur sealing tank and the condenser;

[0022] Figure 2 It is a schematic diagram of the main cross-section of the sulfur sealing tank.

[0023] In the figure: 1. sulfur sealing tank body; 2. liquid sulfur outlet; 3. liquid sulfur buffer zone; 4. elastic diaphragm; 5. liquid phase zone; 6. gas phase zone; 7. partition; 8. condenser; 81. condenser liquid phase outlet; 82. condenser gas phase outlet. DETAILED DESCRIPTION

[0024] Figure 1~Figure 2 The best embodiment of the present invention is shown below in conjunction with the attached Figure 1~Figure 2 The present invention is further described.

[0025] The present invention is further described below in conjunction with specific embodiments. However, people familiar with the art should understand that the detailed description given here in conjunction with the drawings is for better explanation, and the structure of the present invention necessarily exceeds these limited embodiments. For some equivalent replacement schemes or common means, they are no longer described in detail herein, but still belong to the scope of protection of the present application.

[0026] See attached Figure 1-Figure 2 The bottom of the sulfur sealing tank body 1 is a liquid sulfur inlet, and a liquid sulfur outlet 2 is provided in the middle of the sulfur sealing tank body 1. The liquid sulfur outlet 2 is connected to the condenser liquid phase outlet 81 of the condenser 8 through a pipeline, and the condenser gas phase outlet 82 of the condenser 8 is connected to the top of the sulfur sealing tank body 1 through a pipeline.

[0027] In this embodiment, the height of the condenser 8 is higher than the height of the sulfur sealing tank body 1, so that the static pressure of the height difference of the liquid sulfur can push the sealing component to open the flow channel of the partition component.

[0028] The condenser liquid phase outlet 81 of the condenser 8 is located at the lower side of the condenser gas phase outlet 82, and the condenser liquid phase outlet 81 and the condenser gas phase outlet 82 of the condenser 8 are connected, so that the generated liquid sulfur enters the bottom of the sulfur sealing tank body 1 through the pipeline, and flows into the liquid sulfur pool through the liquid sulfur outlet 2, and the process gas is discharged through the condenser gas phase outlet 82.

[0029] The sealing component includes an elastic diaphragm 4, which is arranged on the upper side of the liquid sulfur outlet 2. The elastic diaphragm 4 is sealed with the sulfur sealing tank body 1 and divides the inner cavity of the sulfur sealing tank body 1 into a gas phase area 6 on the upper side and a liquid phase area 5 on the lower side. The liquid sulfur outlet 2 is connected to the liquid phase area 5.

[0030] The partition assembly includes a partition 7, which is arranged in the sulfur sealing tank body 1 and is located at the lower side of the liquid sulfur outlet 2. The partition 7 is fixed and sealed to the inner wall of the sulfur sealing tank body 1, and a liquid sulfur buffer zone 3 is formed between the partition 7 and the elastic diaphragm 4. The liquid sulfur outlet 2 is connected to the liquid sulfur buffer zone 3. In this embodiment, a plurality of liquid sulfur outlets 2 are provided. A flow channel is provided in the middle of the partition 7, so that the liquid sulfur in the liquid phase zone 5 can flow into the liquid sulfur buffer zone 3.

[0031] In the initial state, the middle part of the elastic diaphragm 4 convexes downward and presses the partition 7, thereby closing the flow channel on the partition 7. When and only when the pressure of the liquid phase region 5 is greater than the pressure of the gas phase region 6, the pressure in the liquid phase region 5 pushes the elastic diaphragm 4 upward, thereby realizing the opening of the flow channel.

[0032] When the sulfur sealing tank body 1 leaves the factory, the elastic diaphragm 4 is tightly attached to the flow channel opening, and the flow channel is blocked at this time, that is, the liquid phase area 5 and the liquid sulfur buffer area 3 are two blocked spaces.

[0033] When the sulfur device is started, since there is no liquid sulfur produced in the sulfur device temporarily, the pressure on the gas phase zone 6 side is the pressure of the condenser gas phase outlet 82, and there is no liquid sulfur in the liquid phase zone 5 at this time, and the pressure on the liquid phase zone 5 side is the pressure of the condenser liquid phase outlet 81. Since the pressure of the condenser gas phase outlet 82 is basically equal to the pressure of the condenser liquid phase outlet 81, the elastic diaphragm 4 is tightly attached to the flow channel, and the flow channel is blocked at this time. At this time, the process gas in the liquid phase zone 5 cannot enter the liquid sulfur buffer zone 3 through the flow channel, and then enter the liquid sulfur pool; as the sulfur device produces liquid sulfur, the amount of liquid sulfur from the condenser liquid phase outlet 81 to the liquid phase zone 5 increases, and at this time the elastic diaphragm The pressure on the liquid sulfur side of 4 is the pressure of the condenser liquid phase outlet 81 plus the static pressure generated by the liquid sulfur height from the condenser liquid phase outlet 81 to the liquid phase zone 5, while the pressure in the gas phase zone 6 is still the pressure of the condenser gas phase outlet 82 (the pressure of the condenser gas phase outlet 82 is equal to the pressure of the condenser liquid phase outlet 81), that is, the pressure on the liquid sulfur side of the elastic diaphragm 4 is greater than the pressure on the gas phase side, and the elastic diaphragm 4 is squeezed to move upward toward the gas phase side and separate from the flow channel. At this time, liquid sulfur enters the liquid sulfur buffer zone 3 through the flow channel from the liquid phase zone 5, and enters the liquid sulfur pool from the liquid sulfur outlet 2, thereby realizing that liquid sulfur enters the liquid sulfur pool from the sulfur device.

[0034] When the device produces less liquid sulfur due to various reasons (such as shutdown, etc.), the height of liquid sulfur from the condenser liquid phase outlet 81 to the liquid phase zone 5 decreases, the static pressure decreases, and the pressure difference between the liquid sulfur side of the elastic diaphragm 4 and the gas phase zone 6 gradually decreases until they are equal. At this time, the elastic diaphragm 4 recovers its displacement to the liquid sulfur side due to physical elasticity, and the flow passage area generated by the flow channel and the elastic diaphragm 4 gradually decreases until they are close to zero. At this time, the sulfur device process gas cannot enter the liquid sulfur pool through the flow channel. When the liquid sulfur increases again, the liquid sulfur from the condenser liquid phase outlet 81 to the liquid phase zone 5 gradually increases, the height rises, the static pressure increases, the pressure on the liquid sulfur side of the elastic diaphragm 4 and the pressure on the gas phase side gradually increase. At this time, the elastic diaphragm 4 gradually moves toward the gas phase zone 6 due to extrusion, and the flow area of ​​the liquid sulfur in the flow channel gradually increases. At this time, the liquid sulfur of the sulfur device enters the liquid sulfur buffer zone 3 through the flow channel, and then flows into the liquid sulfur pool.

[0035] The sulfur sealing tank has a small structure and light weight, so that it does not need equipment such as cranes during inspection and maintenance, and only needs to be disassembled and replaced; before work, it is not necessary to buy sulfur and pour it into the sulfur sealing tank when the sulfur device is started, as in the traditional sulfur sealing tank; the sulfur sealing tank of the present invention is not affected by the pressure fluctuation of the sulfur device system; the sulfur sealing tank of the present application can improve the design and operating pressure of the sulfur device, thereby greatly saving the investment of the sulfur device and greatly improving the processing capacity of the sulfur device.

[0036] The present application is not affected by the system pressure of the sulfur device, and prevents the process gas from entering the liquid sulfur pool due to excessive system pressure of the sulfur device, thereby avoiding environmental pollution and safety accidents.

[0037] Since the present application improves the design and operating pressure of the sulfur plant, high pressure is conducive to the Claus reaction 2H2S+SO2→2S+2H2O moving to the right, thereby improving the sulfur conversion rate of the sulfur plant.

[0038] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. A method for achieving sulfur sealing by utilizing the density difference between liquid sulfur and process gas, characterized in that: A sealing component and a partitioning component are arranged inside the sulfur sealing tank body (1); the sealing component is sealedly connected to the inner wall of the sulfur sealing tank body (1) and divides the inner cavity of the sulfur sealing tank body (1) into a gas phase region (6) and a liquid phase region (5); the partitioning component is arranged between a liquid sulfur inlet and a liquid sulfur outlet (2) of the sulfur sealing tank body (1); a flow channel is arranged on the partitioning component; and the liquid sulfur inlet and the liquid sulfur outlet (2) are both connected to the liquid phase region (5); The gas phase region (6) of the sulfur sealing tank body (1) is connected to the condenser gas phase outlet (82) of the condenser (8) of the sulfur equipment, and the condenser liquid phase outlet (81) of the condenser (8) is connected to the liquid sulfur inlet of the sulfur sealing tank body (1); The pressure of the condenser gas phase outlet (82) is equal to the pressure of the gas phase region (6), so that the sealing component maintains the state of closing the flow channel on the partition component; The liquid sulfur condensed in the condenser (8) enters the liquid phase region (5) and pushes the sealing component to open the flow channel of the partition component.

2. The method for realizing sulfur sealing by utilizing the density difference between liquid sulfur and process gas according to claim 1, characterized in that: The liquid sulfur outlet (2) is arranged at the middle of the sulfur sealing tank body (1), and the liquid sulfur inlet is arranged at the bottom of the sulfur sealing tank body (1).

3. The method for realizing sulfur sealing by utilizing the density difference between liquid sulfur and process gas according to claim 1, characterized in that: The partition assembly comprises a partition plate (7), the partition plate (7) is sealedly connected to the inner wall of the sulfur sealing tank body (1), and the flow channel is arranged in the middle of the partition plate (7).

4. The method for realizing sulfur sealing by utilizing the density difference between liquid sulfur and process gas according to claim 1, characterized in that: The sealing component comprises an elastic diaphragm (4), which is fixedly connected to the inner wall of the sulfur sealing tank body (1) and is arranged in a sealing manner.

5. The method for realizing sulfur sealing by utilizing the density difference between liquid sulfur and process gas according to claim 4, characterized in that: The elastic diaphragm (4) and the partition plate (7) are arranged at a distance from each other, and a liquid sulfur buffer zone (3) is formed between the elastic diaphragm (4) and the partition plate (7), and the liquid sulfur outlet (2) is connected to the liquid sulfur buffer zone (3).

6. The method for realizing sulfur sealing by utilizing the density difference between liquid sulfur and process gas according to claim 1 or 5, characterized in that: The liquid sulfur outlets (2) are provided in a plurality.

7. The method for realizing sulfur sealing by utilizing the density difference between liquid sulfur and process gas according to claim 1, characterized in that: The condenser liquid phase outlet (81) is located at the bottom of the condenser (8), the condenser gas phase outlet (82) is located at the top of the condenser (8), and the condenser liquid phase outlet (81) is connected to the condenser gas phase outlet (82).

8. The method for realizing sulfur sealing by utilizing the density difference between liquid sulfur and process gas according to claim 7, characterized in that: The condenser (8) is arranged higher than the sulfur sealing tank body (1), and utilizes the static pressure generated by the height difference of the liquid sulfur to push the sealing component.

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