Device and method for catalytic degassing of liquid sulfur

Abstract

The present invention relates to the technical field of liquid sulfur degassing, and discloses a device and method for catalytic liquid sulfur degassing, including a liquid sulfur tank for storing liquid sulfur and a catalytic degassing tower for degassing, a tank partition is provided in the liquid sulfur tank to separate the liquid sulfur tank into a buffer zone and a finished product zone, a tower partition is provided in the catalytic degassing tower to separate the catalytic degassing tower into a catalytic chamber and a liquid sulfur chamber, and the top of the catalytic degassing tower is connected to an exhaust structure; the buffer zone is connected to the catalytic chamber through a feeding pipeline, an overflow pipe is provided in the liquid sulfur chamber and is connected to reflux to the finished product zone; the inlet of the overflow pipe is lower than the outlet, and the pipe body includes a pipe section higher than the outlet. The present invention effectively promotes catalytic degassing by separating the structures of the liquid sulfur tank and the catalytic degassing tower, and setting the overflow pipe to a structure with a low inlet and a high outlet, and avoids the catalyst powder from flowing back into the liquid sulfur tank along the overflow pipe. Such a design improves the efficiency of degassing and also improves the quality of the liquid sulfur product after degassing.

Description

Technical Field

[0001] The invention relates to the technical field of liquid sulfur degassing, in particular to sulfur recovery in petroleum and natural gas engineering, coal chemical industry and other industries, and in particular to a device and method for catalytic liquid sulfur degassing. Background Art

[0002] The liquid stream produced by the Claus sulfur recovery unit contains H2S dissolved in it. Most of the H2S dissolved in the liquid sulfur is in the form of H2S x In order to avoid environmental pollution and damage to the health of operators during the packaging, storage and transportation of sulfur products, liquid sulfur needs to be degassed. The degassing technologies widely used in the prior art include air stripping (such as bubbling degassing process in liquid sulfur pool) and circulating spray degassing (generally with the addition of ammonia or quinoline), as well as catalytic degassing, which accelerates the removal of H2S in liquid sulfur under the action of catalyst. x The decomposition of the gas makes the degassing effect better.

[0003] The existing catalytic degassing technology is to directly pass air and liquid sulfur into the lower part of the degassing tower equipped with a catalyst bed. The liquid sulfur passes through the catalyst bed and converts H2S x The decomposition of H2S and elemental sulfur, while part of H2S is oxidized into elemental sulfur by oxygen in the air, jointly promoting the escape and removal of H2S in liquid sulfur. The degassed liquid sulfur flows out from the top of the degassing tower into the liquid sulfur seal, and then flows back to the finished product pool in the liquid sulfur pool.

[0004] When liquid sulfur and air pass through the catalyst bed, the catalyst is washed away. In addition, the catalyst may break or pulverize in the later stage of catalytic use. Since the density of the catalyst is less than that of liquid sulfur, the catalyst fragments will float on the upper layer of liquid sulfur and be carried into the degassed liquid sulfur product through the overflow pipeline, causing the sulfur product to fail to meet the standards. In severe cases, it causes the pipeline and equipment to be blocked. In addition, the existing catalytic degassing method relies on the liquid sulfur pool to collect and store liquid sulfur, and the H2S generated during the degassing process corrodes the liquid sulfur pool wall, causing frequent inspections and maintenance of the liquid sulfur pool. In severe cases, the liquid sulfur pool collapses, affecting normal production operations.

[0005] Therefore, the existing catalytic liquid sulfur degassing equipment and methods have obvious deficiencies, and need to be studied and optimized to obtain a more reasonable technical solution to solve the deficiencies in the existing technology. Summary of the invention

[0006] In order to overcome the defects of the prior art mentioned above, the present invention provides a device and method for catalytic degassing of liquid sulfur, aiming to use a more reliable structure as a storage container for liquid sulfur, and optimize the structure of the degassing tower, so as to avoid the catalyst from breaking or pulverizing during the degassing process of liquid sulfur and entering the overflow pipe with the liquid sulfur, causing many problems with the quality of the liquid sulfur product, the overflow pipe and the container.

[0007] In order to achieve the above object, the technical solution specifically adopted by the present invention is:

[0008] A device for catalytically degassing liquid sulfur comprises a liquid sulfur tank for storing liquid sulfur and a catalytic degassing tower for degassing, wherein a tank partition is provided in the liquid sulfur tank to divide the liquid sulfur tank into a buffer zone and a finished product zone, a tower partition is provided in the catalytic degassing tower to divide the catalytic degassing tower into a catalytic chamber and a liquid sulfur chamber, and the top of the catalytic degassing tower is connected to an exhaust structure; the buffer zone is connected to the catalytic chamber through a feeding pipeline, an overflow pipe is provided in the liquid sulfur chamber to connect and reflux to the finished product zone; the inlet of the overflow pipe is lower than the outlet, and the pipe body comprises a pipe section higher than the outlet.

[0009] The above-disclosed degassing device is a device that separates a liquid sulfur tank into a buffer zone and a finished product zone by a tank partition. The liquid sulfur material to be degassed is stored in the buffer zone, and the degassed liquid sulfur product is stored in the finished product zone. The liquid sulfur product can be transported to external equipment for desolidification or direct sales. At the same time, the catalytic degassing tower is divided into a catalytic chamber and a liquid sulfur chamber by a tower partition. The catalytic degassing reaction is mainly carried out in the catalytic chamber. The degassed sulfur-containing gas accumulates at the inner top of the catalytic degassing tower. With the accumulation of sulfur-containing gas, the gas pressure value in the catalytic degassing tower will gradually increase. The liquid sulfur in the catalytic chamber is degassed and overflows from the tower partition into the liquid sulfur chamber, and enters the overflow pipe under the action of gas pressure, rises through the outlet of the overflow pipe, and then flows back to the finished product zone.

[0010] Furthermore, the overflow pipe disclosed in the above technical solution can adopt a variety of structures, which are optimized here and a specific solution is given: the overflow pipe adopts an inverted U-shaped pipe structure. As one of the multiple feasible options, when this structure is adopted, the two pipe openings of the inverted U-shaped pipe face downward, one of which serves as an inlet and extends close to the bottom of the liquid sulfur chamber, and the other serves as an outlet and is connected to the tank wall.

[0011] Furthermore, before the degassed liquid sulfur in the buffer area is transported to the catalytic degassing tower, pretreatment can achieve a better degassing effect. Therefore, the degassed liquid sulfur is pretreated on the feeding pipeline, so the feeding pipeline is optimized. Here, the following feasible scheme is given: a static mixer is provided on the feeding pipeline, and an air mixing branch is provided on the feeding pipeline. After the external air enters the feeding pipeline through the air mixing branch, it is transported to the static mixer together with the degassed liquid sulfur in the buffer area. In the static mixer, the external air is mixed with the degassed liquid sulfur, and the air can promote the removal of sulfur-containing gas from the liquid sulfur.

[0012] Furthermore, the liquid phase in the liquid sulfur tank is not completely filled, so there is a partial gas phase. There is a part of sulfur-containing gas in the gas phase, which can be guided for treatment. There are many specific treatment methods. Here, the structure of the liquid sulfur tank is optimized, and the internal gas phase is removed. The following specific feasible scheme is given: a gas phase pipeline is provided on the liquid sulfur tank, and the gas phase pipeline is connected to a static mixer or an exhaust structure.

[0013] When the gas phase passes through the gas phase pipeline to the static mixer, it is mixed with air and degassed liquid sulfur, and then discharged uniformly after catalytic degassing. When the gas phase passes through the gas phase pipeline to the exhaust structure, it can be directly discharged to the subsequent system equipment through the exhaust structure.

[0014] Furthermore, in order to promote the outflow of the gas phase in the liquid sulfur tank, a negative pressure device for assisting the flow of gas is provided on the gas phase pipeline. Generally, the negative pressure device includes but is not limited to an exhaust fan, a steam ejector, and the like.

[0015] Furthermore, when the gas phase in the liquid sulfur tank is discharged through the gas phase pipeline, in order to maintain the gas pressure balance in the liquid sulfur tank, an air supply pipe is also provided on the liquid sulfur tank. An air valve structure is provided in the air supply pipe so that external air can only enter the liquid sulfur tank in one direction.

[0016] During the catalytic degassing process, the catalyst on the catalytic bed is prone to fragmentation and powderization, and then overflows into the liquid sulfur chamber with the liquid sulfur. In order to prevent the catalyst from entering the overflow pipe and flowing back to the finished product area, the catalyst is removed as waste slag here. Specifically, a feasible solution is given: a slag discharge pipeline connected to the liquid sulfur tank is provided on the tank wall at the liquid sulfur chamber, the pipe inlet of the slag discharge pipeline is flush with the tower partition, and a detachable filtering device is provided on the slag discharge pipeline. When the catalyst enters the liquid sulfur chamber with the liquid sulfur, it will be suspended on the surface of the liquid sulfur because the density of the catalyst is less than that of the liquid sulfur. When the liquid level in the liquid sulfur chamber reaches the pipe inlet of the slag discharge pipeline, the slag discharge process can be carried out; the substance in the slag discharge pipeline is a mixture of liquid sulfur and catalyst, and the filtering device can filter the catalyst, and the degassed liquid sulfur flows into the liquid sulfur tank along the slag discharge pipeline, wherein the pipe outlet of the slag discharge pipeline can be connected to the finished product area.

[0017] Furthermore, the buffer area and the finished product area in the liquid sulfur tank are isolated from each other, but the substances may not be completely discharged, and the substances retained in the liquid sulfur tank may cause damage to the tank body, so it is necessary to make dedicated improvements to assist in the discharge; specifically, the following feasible solutions are given: a discharge pipeline is provided between the buffer area and the finished product area, and a discharge pump and a valve group for controlling the on-off are provided on the discharge pipeline.

[0018] The above content discloses a device for catalytic degassing of liquid sulfur. The present invention also discloses a method for catalytic degassing of liquid sulfur. The specific content is described as follows.

[0019] A method for catalytic degassing of liquid sulfur, using the device for catalytic degassing of liquid sulfur as described above, comprising:

[0020] The overflow pipe inlet in the liquid sulfur chamber forms a liquid seal;

[0021] At least the external air from the air mixing branch and the liquid sulfur to be degassed in the buffer area are premixed in the static mixer;

[0022] The premixed mixed medium passes through the catalyst bed from bottom to top in the catalytic chamber, and the liquid sulfur is degassed under the combined action of the catalyst and air;

[0023] The removed sulfur-containing gas gathers at the top of the catalytic degassing tower, and the degassed liquid sulfur overflows into the liquid sulfur chamber through the top of the tower partition, and flows back to the finished product area of ​​the liquid sulfur tank through the overflow pipe.

[0024] In the above disclosed catalytic liquid sulfur degassing method, liquid sulfur of a certain liquid level is first accumulated in the liquid sulfur chamber to close the inlet of the overflow pipe to prevent the removed sulfur-containing gas from being discharged along the overflow pipe. This step is called liquid sealing. After the liquid sealing is achieved, the liquid sulfur to be degassed in the buffer area is mixed with air and then transported to the catalytic chamber for catalytic degassing. The removed sulfur-containing gas accumulates at the top of the catalytic degassing tower. The degassed liquid sulfur overflows into the liquid sulfur chamber for temporary storage and flows back to the finished product area after reaching the outlet of the overflow pipe.

[0025] In this process, since a tower partition is provided and the inlet of the overflow pipe is lower than the outlet and the pipe body is higher than the outlet, the catalyst mixed with liquid sulfur will not flow into the liquid sulfur tank from the overflow pipe; and the slag discharge pipeline provided can remove the catalyst from the liquid sulfur chamber and perform filtering treatment.

[0026] Furthermore, the method of forming a liquid seal at the overflow pipe inlet in the liquid sulfur chamber includes:

[0027] Appropriate sulfur is placed in the liquid sulfur chamber and heated to melt to form a liquid seal; or the overflow pipe is blocked first, and the liquid sulfur overflowing from the catalytic chamber floods the inlet of the overflow pipe to form a liquid seal.

[0028] Furthermore, since the top section of the overflow pipe is higher than the outlet and higher than the tower partition, in order to facilitate the smooth removal of liquid sulfur, the air pressure in the catalytic degassing tower is set. When the air pressure value in the catalytic degassing tower reaches 70kPa, the exhaust structure at the top of the catalytic desulfurization tower is opened to discharge the removed sulfur-containing gas.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention effectively promotes catalytic degassing by separating the structure of the liquid sulfur tank and the catalytic degassing tower, and arranging the overflow pipe into a structure with a low inlet and a high outlet, and avoids the catalyst from flowing back into the liquid sulfur tank along the overflow pipe. Such a design improves the degassing efficiency and the quality of the liquid sulfur product after degassing. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only represent some embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 is a schematic diagram of the device component modules in Example 1;

[0033] Figure 2 It is a schematic diagram of the device component modules in Example 2.

[0034] The meanings of the numbers in the accompanying drawings are as follows: 1. Buffer area; 2. Liquid sulfur degassing pump; 3. Valve group; 4. Finished product area; 5. Liquid sulfur delivery pump; 6. Tank partition; 7. Liquid sulfur tank; 8. Negative pressure equipment; 9. Catalytic degassing tower; 10. Filter device; 11. Tower partition; 12. Outlet of overflow pipe; 13. Steam jacket valve; 14. Air supply pipe; 15. Static mixer; 16. Overflow pipe. DETAILED DESCRIPTION

[0035] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0036] It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. The specific structures and functional details disclosed herein are only used to describe the exemplary embodiments of the present invention. However, the present invention can be embodied in many alternative forms, and it should not be understood that the present invention is limited to the embodiments set forth herein.

[0037] Example 1

[0038] This embodiment describes a device for degassing liquid sulfur. On the basis of the prior art, the structure of the device is optimized and improved, liquid sulfur is stored in partitions, and the catalytic degassing space in the catalytic degassing tower 9 is divided into two cavities, and degassing and overflow are performed separately, which can improve the efficiency of degassing and prevent the catalyst from entering the liquid sulfur tank 7 along the overflow pipe 16, thereby improving the quality of the product.

[0039] Specifically, Figure 1As shown, a device for catalytic liquid sulfur degassing disclosed in this embodiment includes a liquid sulfur tank 7 for storing liquid sulfur and a catalytic degassing tower 9 for degassing, wherein the liquid sulfur tank 7 is provided with a tank partition 6 to divide the liquid sulfur tank 7 into a buffer area 1 and a finished product area 4, and the catalytic degassing tower 9 is provided with a tower partition 11 to divide the catalytic degassing tower 9 into a catalytic chamber and a liquid sulfur chamber, and the top of the catalytic degassing tower 9 is connected to an exhaust structure; the buffer area 1 is connected to the catalytic chamber through a feeding pipeline, and an overflow pipe 16 is provided in the liquid sulfur chamber to be connected and refluxed to the finished product area 4; the inlet of the overflow pipe 16 is lower than the outlet, and the pipe body includes a pipe section higher than the outlet.

[0040] In this embodiment, the feeding pipeline includes pipeline ② and pipeline ④; the overflow pipe 16 is connected to the finished product area 4 through pipeline ⑥.

[0041] The above disclosed degassing device, through the tank partition 6, separates the liquid sulfur tank 7 into a buffer area 1 and a finished product area 4, the buffer area 1 stores the liquid sulfur material to be degassed, and the finished product area 4 stores the degassed liquid sulfur product, and the liquid sulfur product can be transported to an external device for desolidification molding or directly sold, such as Figure 1 As shown, it can be transported to the outside through pipeline ⑨; at the same time, the catalytic degassing tower 9 is divided into a catalytic chamber and a liquid sulfur chamber by the tower partition 11. The catalytic chamber mainly carries out catalytic degassing reaction, and the desorbed sulfur-containing gas accumulates at the inner top of the catalytic degassing tower 9. With the accumulation of sulfur-containing gas, the gas pressure value in the catalytic degassing tower 9 will gradually increase; the liquid sulfur in the catalytic chamber is degassed and overflows from the tower partition 11 to the liquid sulfur chamber, and enters the overflow pipe 16 under the action of gas pressure, rises through the outlet 12 of the overflow pipe, and then flows back to the finished product area 4.

[0042] Preferably, in this embodiment, a liquid sulfur degassing pump 2 and a liquid sulfur delivery pump 5 are provided on the liquid sulfur tank 7, and the liquid sulfur to be degassed in the buffer area 1 enters the feeding pipeline through the liquid sulfur degassing pump 2 and finally enters the catalytic chamber; the liquid sulfur in the genuine area is transported to the outside through the liquid sulfur delivery pump 5 for sulfur desolidification molding or product system.

[0043] In this embodiment, the loading amount of the catalyst is about 0.6 to 1 m 3 Corresponding to 1t / h of liquid sulfur, the height-to-diameter ratio of the catalyst bed is 1.5-2.

[0044] The overflow pipe 16 disclosed in the above technical solution can adopt a variety of structures. This embodiment is optimized and a specific solution is given: the overflow pipe 16 adopts an inverted U-shaped pipe structure. As one of the multiple feasible options, when this structure is adopted, the two pipe openings of the inverted U-shaped pipe face downward, one of which serves as an inlet and extends close to the bottom of the liquid sulfur chamber, and the other serves as an outlet and is connected to the tank wall.

[0045] Preferably, the distance between the inlet of the inverted U-shaped tube and the bottom of the liquid sulfur chamber is less than or equal to 300 mm, and the outlet of the inverted U-shaped tube is 100 mm lower than the highest point of the overflow pipe 16.

[0046] In this embodiment, the height of the tower partition 11 is set to be greater than or equal to 4.2 m; after the distance between the tower partition 11 and the inlet of the inverted U-shaped tube and the bottom of the liquid sulfur chamber is set, the height of the liquid seal can withstand at least 70 kPa of gas pressure after reaching the height of the tower partition.

[0047] Before the degassed liquid sulfur in the buffer area 1 is transported to the catalytic degassing tower 9, pretreatment can achieve better degassing effect. Therefore, the degassed liquid sulfur is pretreated on the feeding pipeline, so the feeding pipeline is optimized. Here, the following feasible solutions are given: a static mixer 15 is provided on the feeding pipeline, and an air mixing branch is provided on the feeding pipeline, such as Figure 1 As shown, the air mixing branch is pipeline ①; after the external air enters the feeding pipeline through the air mixing branch, it is transported to the static mixer 15 together with the liquid sulfur to be degassed in the buffer area 1. In the static mixer 15, the external air is mixed with the liquid sulfur to be degassed, and the air can promote the removal of sulfur-containing gas from the liquid sulfur.

[0048] A static mixer 15 is provided to fully premix the air, liquid sulfur and the gas extracted from the liquid sulfur tank 7, so as to improve the oxidation degassing effect and avoid the problem of liquid sulfur solidifying and clogging the pores after shutdown when a gas distributor is provided at the bottom of the degassing tower.

[0049] The liquid phase in the liquid sulfur tank 7 is not completely filled, so there is a partial gas phase. There is a part of sulfur-containing gas in the gas phase, which can be guided for treatment. There are many specific treatment methods. Here, the structure of the liquid sulfur tank 7 is optimized, and the internal gas phase is removed. The following specific feasible scheme is given: the liquid sulfur tank 7 is provided with a gas phase pipeline, and the gas phase pipeline is connected to the static mixer 15 or the exhaust structure.

[0050] Preferably, in this embodiment, the outlet of the gas phase pipeline is located above the finished product area 4, such as Figure 1 As shown, the gas phase pipelines are pipeline ⑩ and pipeline ③.

[0051] In this embodiment, when the gas phase passes through the gas phase pipeline to the static mixer 15, it is mixed with air and degassed liquid sulfur, and then discharged uniformly after catalytic degassing treatment. Figure 1 As shown, all the waste is discharged through pipeline ⑦.

[0052] In order to promote the outflow of the gas phase in the liquid sulfur tank 7, a negative pressure device 8 for assisting the flow of gas is arranged on the gas phase pipeline.

[0053] Preferably, the negative pressure device 8 is an exhaust fan, which creates negative pressure in the gas phase pipeline, sucks out the gas phase in the liquid sulfur tank 7 and transports it to the static mixer 15.

[0054] The overflow pipe 16 is directly connected to the liquid sulfur tank 7. Even in extreme cases, when the liquid seal is broken, part of the H2S-containing gas enters the gas phase space of the liquid sulfur tank 7 and is sucked out by the exhaust fan and sent to the closed system for circulation treatment, which will not cause harm to people and the environment.

[0055] After the gas phase in the liquid sulfur tank 7 is discharged through the gas phase pipeline, in order to maintain the gas pressure balance in the liquid sulfur tank 7, an air supply pipe 14 is further provided on the liquid sulfur tank 7, and a gas valve structure is provided in the air supply pipe 14 so that the external air can only enter the liquid sulfur tank 7 in one direction. Preferably, the gas valve structure adopts a one-way gas valve.

[0056] During the catalytic degassing process, the catalyst on the catalytic bed is prone to breakage and powderization, and then overflows into the liquid sulfur chamber with the liquid sulfur. In order to prevent the catalyst from entering the overflow pipe 16 and flowing back to the finished product area 4, the catalyst is removed as waste slag here. Specifically, a feasible solution is given: a slag discharge pipeline connected to the liquid sulfur tank 7 is provided on the tank wall at the liquid sulfur chamber, the pipe inlet of the slag discharge pipeline is flush with the tower partition 11, and a detachable filtering device 10 is provided on the slag discharge pipeline, such as Figure 1 As shown, the slag discharge pipeline is pipeline ⑤. When the catalyst enters the liquid sulfur chamber with the liquid sulfur, the catalyst will be suspended on the surface of the liquid sulfur because its density is lower than that of the liquid sulfur. When the liquid surface in the liquid sulfur chamber reaches the pipe inlet of the slag discharge pipeline, the slag discharge process can be carried out; the substance in the slag discharge pipeline is a mixture of liquid sulfur and catalyst, and the filtering device 10 can filter the catalyst, while the degassed liquid sulfur flows into the liquid sulfur tank 7 along the slag discharge pipeline, wherein the pipe outlet of the slag discharge pipeline can be connected to the finished product area 4.

[0057] Preferably, in this embodiment, the pipe inlet height of the slag discharge pipeline is flush with the upper end of the tower partition 11, and the filter arranged thereon is a steam jacket filter. Steam jacket valves 13 are arranged at both ends, and the filter can be regularly disassembled and taken out for cleaning.

[0058] The buffer area 1 and the finished product area 4 in the liquid sulfur tank 7 are isolated from each other, but the substances may not be completely discharged. The substances retained in the liquid sulfur tank 7 may damage the tank body, so it is necessary to make efforts to improve and assist in the discharge. Specifically, the following feasible solutions are given: a discharge pipeline is set between the buffer area 1 and the finished product area 4, and a discharge pump and a valve group 3 for controlling the on-off are set on the discharge pipeline. Figure 1 As shown, the discharge pipeline is pipeline ⑧.

[0059] Preferably, the valve group 3 provided on the discharge pipeline is a steam jacketed valve 13. The steam jacketed liquid sulfur tank 7 avoids the corrosion problem of the wall of the traditional concrete liquid sulfur tank, and the liquid sulfur tank 7 has a longer service life and a lower risk of damage.

[0060] The gas removed in the catalytic degassing tower 9 is discharged through the exhaust structure at the top and then transported to the main combustion furnace of the sulfur recovery device for treatment. The exhaust structure here includes an exhaust pipe connected to the catalytic degassing tower 9 and a pressure regulating valve arranged on the exhaust pipe.

[0061] The liquid sulfur after degassing by the integrated device can meet the H2S requirement of less than 10ppm.

[0062] Example 2

[0063] This embodiment is optimized on the basis of a device for catalytic liquid sulfur degassing disclosed in Example 1. Similar to Example 1, the device disclosed in this embodiment includes a liquid sulfur tank 7 for storing liquid sulfur and a catalytic degassing tower 9 for degassing. The liquid sulfur tank 7 is provided with a tank partition 6 to divide the liquid sulfur tank 7 into a buffer area 1 and a finished product area 4. The catalytic degassing tower 9 is provided with a tower partition 11 to divide the catalytic degassing tower 9 into a catalytic chamber and a liquid sulfur chamber. The top of the catalytic degassing tower 9 is connected to an exhaust structure; the buffer area 1 is connected to the catalytic chamber through a feeding pipeline, and an overflow pipe 16 is provided in the liquid sulfur chamber to be connected and refluxed to the finished product area 4; the inlet of the overflow pipe 16 is lower than the outlet, and the pipe body includes a pipe section higher than the outlet.

[0064] Different from Example 1, this example has a different arrangement for the gas phase pipeline.

[0065] like Figure 2 As shown, in this embodiment, the gas phase is passed to the exhaust structure along the gas phase pipeline, and can be directly discharged to the subsequent system equipment along the exhaust structure.

[0066] Preferably, in this embodiment, a steam ejector is used as the negative pressure device 8 .

[0067] The structures of other parts of this embodiment are the same as those of Embodiment 1 and will not be described again here.

[0068] Example 3

[0069] The contents in the above embodiments disclose a device for catalytically degassing liquid sulfur. This embodiment discloses a method for catalytically degassing liquid sulfur. The specific contents are described as follows.

[0070] A method for catalytic degassing of liquid sulfur, using the device for catalytic degassing of liquid sulfur as described above, comprising:

[0071] S01: forming a liquid seal at the inlet of the overflow pipe 16 in the liquid sulfur chamber;

[0072] S02: at least premixing the external air from the air mixing branch and the liquid sulfur to be degassed in the buffer zone 1 in the static mixer 15;

[0073] S03: The premixed mixed medium passes through the catalyst bed from bottom to top in the catalytic chamber, and liquid sulfur is degassed under the combined action of the catalyst and air;

[0074] S04: The removed sulfur-containing gas gathers at the top of the catalytic degassing tower 9, and the degassed liquid sulfur overflows into the liquid sulfur chamber through the top of the tower partition 11, and flows back to the finished product area 4 of the liquid sulfur tank 7 through the overflow pipe 16.

[0075] In the above disclosed catalytic liquid sulfur degassing method, liquid sulfur of a certain liquid level is first accumulated in the liquid sulfur chamber to close the inlet of the overflow pipe 16 to prevent the removed sulfur-containing gas from being discharged along the overflow pipe 16. This step is called liquid sealing. After the liquid sealing is achieved, the liquid sulfur to be degassed in the buffer area 1 is mixed with air and transported to the catalytic chamber for catalytic degassing. The removed sulfur-containing gas accumulates at the top of the catalytic degassing tower 9. The degassed liquid sulfur overflows into the liquid sulfur chamber for temporary storage, reaches the outlet 12 of the overflow pipe, and then flows back to the finished product area 4.

[0076] In this process, since the tower partition 11 is provided and the inlet of the overflow pipe 16 is lower than the outlet and the pipe body is higher than the outlet, the catalyst mixed with liquid sulfur will not flow into the liquid sulfur tank 7 from the overflow pipe 16; and the slag discharge pipeline provided can remove the catalyst from the liquid sulfur chamber and perform filtering treatment.

[0077] In this embodiment, the overflow pipe 16 in the liquid sulfur chamber is sealed by two methods, including the following solutions:

[0078] 1. Place appropriate amount of sulfur in the liquid sulfur chamber and heat it to melt it to form a liquid seal.

[0079] 2. The overflow pipe 16 is blocked first, and the inlet of the overflow pipe 16 is flooded by the liquid sulfur overflowing from the catalytic chamber to form a liquid seal.

[0080] Since the top pipe section of the overflow pipe 16 is higher than the outlet and higher than the tower partition 11, in order to facilitate the smooth removal of liquid sulfur, the air pressure in the catalytic degassing tower 9 is set. When the air pressure value in the catalytic degassing tower 9 reaches 70kPa, the exhaust structure at the top of the catalytic desulfurization tower is opened to discharge the removed sulfur-containing gas.

[0081] The above are the embodiments of the present invention, but the present invention is not limited to the above optional embodiments. Those skilled in the art can arbitrarily combine the above methods to obtain other various embodiments. Anyone can obtain other various forms of embodiments under the enlightenment of the present invention. The above specific embodiments should not be understood as limiting the scope of protection of the present invention. The scope of protection of the present invention shall be based on the definition in the claims, and the description can be used to interpret the claims.

Claims

1. A device for catalytic degassing of liquid sulfur, characterized in that: The invention comprises a liquid sulfur tank (7) for storing liquid sulfur and a catalytic degassing tower (9) for degassing, wherein a tank partition (6) is arranged in the liquid sulfur tank (7) to divide the liquid sulfur tank (7) into a buffer area (1) and a finished product area (4), and a tower partition (11) is arranged in the catalytic degassing tower (9) to divide the catalytic degassing tower (9) into a catalytic chamber and a liquid sulfur chamber, and the top of the catalytic degassing tower (9) is connected to an exhaust structure; the buffer area (1) is connected to the catalytic chamber through a feeding pipeline, and an overflow pipe (16) is arranged in the liquid sulfur chamber to connect and reflux to the finished product area (4); the inlet of the overflow pipe (16) is lower than the outlet, and the pipe body includes a pipe section higher than the outlet; The overflow pipe (16) adopts an inverted U-shaped pipe structure; The feed pipeline is provided with a static mixer (15), and an air mixing branch is provided on the feed pipeline. External air enters the feed pipeline through the air mixing branch and is then transported to the static mixer (15) together with the liquid sulfur to be degassed in the buffer area (1). A slag discharge pipeline connected to the liquid sulfur tank (7) is arranged on the tank wall at the liquid sulfur chamber, the pipe inlet of the slag discharge pipeline is flush with the tower partition (11), and a detachable filtering device (10) is arranged on the slag discharge pipeline; A discharge pipeline is provided between the buffer area (1) and the finished product area (4), and a discharge pump and an on-off control valve group (3) are provided on the discharge pipeline.

2. The device for catalytic degassing of liquid sulfur according to claim 1, characterized in that: The liquid sulfur tank (7) is provided with a gas phase pipeline, which is connected to the static mixer (15) or the exhaust structure.

3. The device for catalytic degassing of liquid sulfur according to claim 2, characterized in that: The gas phase pipeline is provided with a negative pressure device (8) for assisting the flow of gas.

4. A method for catalytic degassing of liquid sulfur, using the device for catalytic degassing of liquid sulfur as claimed in any one of claims 1 to 3, characterized in that: include: The inlet of the overflow pipe (16) in the liquid sulfur chamber is sealed with liquid; At least external air from the air mixing branch and the liquid sulfur to be degassed in the buffer area (1) are premixed in the static mixer (15); The premixed mixed medium passes through the catalyst bed from bottom to top in the catalytic chamber, and the liquid sulfur is degassed under the combined action of the catalyst and air; The removed sulfur-containing gas gathers at the top of the catalytic degassing tower (9), and the degassed liquid sulfur overflows into the liquid sulfur chamber through the top of the tower partition (11), and flows back to the finished product area (4) of the liquid sulfur tank (7) through the overflow pipe (16).

5. The method for catalytic degassing of liquid sulfur according to claim 4, characterized in that: The method of forming a liquid seal at the inlet of the overflow pipe (16) in the liquid sulfur chamber comprises: An appropriate amount of sulfur is placed in the liquid sulfur chamber and heated to melt to form a liquid seal; or the overflow pipe (16) is first blocked, and the liquid sulfur overflowing from the catalytic chamber floods the inlet of the overflow pipe (16) to form a liquid seal.

6. The method for catalytic degassing of liquid sulfur according to claim 4, characterized in that: When the gas pressure in the catalytic degassing tower (9) reaches 70 kPa, the exhaust structure at the top of the catalytic desulfurization tower is opened to discharge the desulfurized sulfur-containing gas.

Images