Float valve type sulfur-sealed tank

Abstract

A float valve type sulfur-sealed tank relates to the field of sulfur-sealed tanks and comprises a vertical sulfur-sealed tank body, the side wall of the sulfur-sealed tank body is provided with a liquid sulfur inlet and a liquid sulfur outlet, and the liquid sulfur inlet is located above the liquid sulfur outlet; a lower limiting piece, a floating valve assembly and an upper limiting piece are sequentially arranged in the sulfur-sealed tank body from bottom to top; the float valve assembly comprises a float bowl and a guide rod fixed to the float bowl, and the two ends of the guide rod penetrate through the upper limiting piece and the lower limiting piece in a sliding mode respectively. The lower limiting part comprises a partition plate, a sealing base plate located on the upper side of the partition plate and a guide support located on the lower side of the partition plate, the sealing base plate is located above the liquid sulfur outlet and provided with a liquid sulfur channel, and the floating valve assembly is provided with a sealing plug capable of blocking the liquid sulfur channel. The utility model provides a device structure different from the prior art so as to avoid excavation of a sulfur sealing pit for placing a traditional sulfur sealing tank.

Description

Technical Field

[0001] The utility model relates to the field of sulfur sealing tanks, in particular to a floating valve type sulfur sealing tank. Background Art

[0002] Sulfur seal tank, also known as liquid sulfur seal, is an essential safety equipment for the liquid sulfur system of sulfur recovery unit. Its principle is to use the sealing structure to effectively seal the process gas to avoid process gas leakage while allowing liquid sulfur to pass normally. The separated liquid sulfur is stored in the liquid sulfur pool, while the gas is discharged, thus ensuring the normal production of the unit.

[0003] In the liquid sulfur system, the position relationship between the traditional sulfur sealing tank and the liquid sulfur pool is as follows: Figure 4 As shown, the process gas comes from the upstream combustion furnace, the waste heat boiler or sulfur cooler is usually a ground equipment, and the liquid sulfur flows from the outlet of the waste heat boiler or sulfur cooler to the liquid sulfur pool in a gravity state. The liquid sulfur outlet is located at the lowest point of the outlet pipe box of the waste heat boiler or sulfur cooler, usually within 1m from the ground. The total height of the traditional liquid sulfur sealing equipment is 4 to 5 meters, so it is necessary to dig a sulfur sealing pit next to the sulfur pool to place the liquid sulfur seal and its necessary operation and maintenance space. The traditional sulfur sealing pit has the following disadvantages: 1. The sulfur sealing pit needs to be excavated underground, and the civil engineering cost is high; 2. The interior of the sulfur sealing pit is a closed space, which is easy to cause H 2 S accumulates at the bottom, posing a major safety hazard during operation and maintenance; 3. The liquid sulfur pipeline and the corresponding steam heating pipeline in the sulfur sealing pit are not easy to lay, and the pipeline connecting to the liquid sulfur pool is easily damaged due to thermal expansion and contraction, resulting in leakage.

[0004] A Chinese utility model patent with publication number CN 205740363 U discloses a float liquid sulfur sealing tank, comprising a liquid sulfur vertical pipe section and a steam jacket arranged outside the liquid sulfur vertical pipe section, a jacket vent valve is arranged on the top of the liquid sulfur vertical pipe section through a flange, a liquid sulfur straight pipe section is arranged on one side of the liquid sulfur vertical pipe section, the liquid sulfur straight pipe section is connected to the liquid sulfur vertical pipe section, the upper part of the liquid sulfur straight pipe section is a cylindrical barrel, and the lower part is a convergent cylindrical barrel, a float is arranged at the convergence inside the liquid sulfur straight pipe section, and the liquid sulfur pipeline is blocked or opened by the float.

[0005] However, the sulfur sealing tank that uses the buoyancy of liquid sulfur to control the opening and closing of the valve to achieve liquid sulfur transportation and prevent the leakage of harmful gases is not limited to the above structure. The utility model discloses a floating valve type sulfur sealing tank that is different from the prior art structure. Utility Model Content

[0006] The utility model aims to provide a floating valve type sulfur sealing tank to avoid digging a sulfur sealing pit for placing a traditional sulfur sealing tank.

[0007] In order to solve the above technical problems, the specific scheme adopted by the utility model is as follows: a float valve type sulfur sealing tank, comprising a vertical sulfur sealing tank body, a side wall of the sulfur sealing tank body is provided with a liquid sulfur inlet and a liquid sulfur outlet, and the liquid sulfur inlet is located above the liquid sulfur outlet; a lower limit piece, a float valve assembly and an upper limit piece are sequentially arranged in the sulfur sealing tank body from bottom to top; the float valve assembly comprises a float and a guide rod fixed on the float, and the two ends of the guide rod are respectively slidably penetrated through the upper limit piece and the lower limit piece; the lower limit piece comprises a partition plate, a sealing pad plate located on the upper side of the partition plate and a guide bracket located on the lower side of the partition plate, the sealing pad plate is located above the liquid sulfur outlet and a liquid sulfur channel is opened on the sealing pad plate, and a sealing plug capable of blocking the liquid sulfur channel is provided on the float valve assembly.

[0008] As a further optimization of the above technical solution, a sealing plug is arranged at the bottom of the buoy.

[0009] As a further optimization of the above technical solution, the sealing plug is arranged on the guide rod below the buoy.

[0010] As a further optimization of the above technical solution, the sealing plug is in the shape of a cone with the tip pointing downward.

[0011] As a further optimization of the above technical solution, the guide bracket is fixed on the partition plate, and the guide bracket has a guide hole for the guide rod to pass through.

[0012] As a further optimization of the above technical solution, a guide hole for the guide rod to pass through is provided on the upper limit member.

[0013] As a further optimization of the above technical solution, the guide rod is inserted into the buoy, and the guide rod and the buoy are coaxially arranged.

[0014] As a further optimization of the above technical solution, the guide rod includes an upper guide rod and a lower guide rod that are coaxially arranged.

[0015] As a further optimization of the above technical solution, a filter is arranged in the sulfur sealing tank body between the liquid sulfur inlet and the upper limit member.

[0016] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0017] The height of the float valve sulfur seal tank of the utility model is only 1 / 4 of that of the traditional liquid sulfur seal tank. The reduction in height makes the sulfur seal tank change from underground equipment to above-ground equipment, avoiding many disadvantages of the sulfur seal pit. The reduction in the height of the sulfur seal tank can make the downstream liquid sulfur storage tank become above-ground equipment or semi-buried equipment, reducing the construction cost of the sulfur pool and making operation and maintenance more convenient. With the reduction in the height of the sulfur seal tank, the float valve sulfur seal tank can be directly installed on the pipe mouth of the liquid sulfur storage tank, making the entire system more airtight, effectively preventing the leakage of harmful gases, and making replacement and maintenance more convenient.

[0018] By providing a guide structure for the float, the float can be prevented from shaking in the sulfur sealing tank; the larger the contact area of ​​the guide structure, the greater the risk of the float being stuck due to the deposition, precipitation and crystallization of liquid sulfur. The guide structure adopted in the utility model allows the float guide rod to pass through the guide hole in the middle of the limiter. The contact area between the movable part and the fixed part is very small. Even if impurities are deposited in the contact area, it only needs to overcome a very small shear resistance to operate normally, thereby effectively preventing the float from being stuck.

[0019] The utility model provides a guide rod through the buoy, and a sealing plug is arranged on the rod body of the lower guide rod. The liquid sulfur inlet and the liquid sulfur outlet are connected or blocked by the cooperation between the sealing plug and the sealing pad. The adaptability of the sealing plug and the through hole on the sealing pad can be controlled to achieve a better sealing effect. The utility model is suitable for actual production and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model;

[0021] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0022] Figure 3 This is a schematic diagram of the positional relationship between the float valve type sulfur sealing tank and the liquid sulfur tank in the utility model;

[0023] Figure 4 It is a schematic diagram of the positional relationship between the conventional sulfur sealing tank and the liquid sulfur pool in the prior art;

[0024] Figure numerals: 1. sulfur sealing tank body, 2. filter, 3. upper limit member, 301. strip plate, 302. first fixing bolt, 303. support block, 4. float valve assembly, 401. guide rod, 402. float, 403. sealing plug, 5. lower limit member, 501. sealing pad, 502. partition, 503. guide bracket, 504. second fixing bolt, 505. third fixing bolt, 506. support platform, 6. liquid sulfur outlet, 7. annular boss, 8. liquid sulfur inlet. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments. Parts that are not described and disclosed in detail in the following description of the present invention, such as the installation method of the filter on the sulfur sealing tank, the arrangement method of the end covers at the upper and lower ends of the sulfur sealing tank, the connection between the liquid sulfur inlet and the upstream sulfur cooler, the connection between the liquid sulfur outlet and the downstream liquid sulfur tank in the liquid sulfur system, etc., should be understood as the prior art known or should be known to those skilled in the art.

[0026] The utility model discloses a floating valve type sulfur sealing tank, comprising a vertical sulfur sealing tank body 1 and end covers arranged at the upper and lower ends of the sulfur sealing tank body 1. The sulfur sealing tank body 1 is cylindrical, and its side wall is provided with a liquid sulfur inlet 8 and a liquid sulfur outlet 6, the liquid sulfur inlet 8 and the liquid sulfur outlet 6 are located on different sides of the sulfur sealing tank body 1, and the liquid sulfur inlet 8 is located above the liquid sulfur outlet 6, such as Figure 1 As shown, the liquid sulfur inlet 8 is located at the upper left part of the sulfur enclosure tank body 1 , and the liquid sulfur outlet 6 is located at the lower right part of the sulfur enclosure tank body 1 .

[0027] A lower limit member 5, a float valve assembly 4 and an upper limit member 3 are sequentially arranged in the sulfur sealing tank body 1 from bottom to top.

[0028] The float valve assembly 4 includes a float 402 and a guide rod 401 fixed on the float 402, and the two ends of the guide rod 401 are respectively slidably arranged in the upper limit member 3 and the lower limit member 5. The float 402 is cylindrical and is coaxially arranged with the cylindrical sulfur sealing tank body 1. The outer diameter of the float 402 is smaller than the inner diameter of the sulfur sealing tank body 1, so that the float 402 can move up and down in the sulfur sealing tank body 1. The upper and lower end surfaces of the float 402 are both set as convex cylindrical surfaces. This setting method can reduce the resistance generated by liquid sulfur when the float 402 floats up and down.

[0029] The outer wall of the buoy 402 is made of corrosion-resistant stainless steel, and the interior is filled with lightweight heat-resistant materials such as expanded perlite and glass bricks. The interior of the buoy 402 is at normal pressure at room temperature. However, in the working state, as the temperature rises, the internal pressure will reach about 0.15MPa. When operating in a long-term high temperature and high pressure environment, the buoy 402 may face the risk of leakage failure. In order to cope with this situation, the lightweight heat-resistant material filled inside the buoy 402 can slow down the entry of liquid sulfur. Even if a small amount of liquid sulfur enters the interior of the buoy 402, it will not immediately cause the entire equipment to fail.

[0030] The guide rod 401 is fixed in the buoy 402 and is coaxially arranged with the buoy 402 . The fixing method with the buoy 402 is the existing technology, such as interference fit, bonding, etc.

[0031] As another arrangement of the guide rod, the guide rod includes an upper guide rod located above the buoy 402 and a lower guide rod located below the buoy 402. The upper guide rod and the lower guide rod are two separately arranged rod bodies. The upper guide rod and the lower guide rod are respectively fixedly connected to the buoy 402 and are coaxially arranged.

[0032] The guide rod 401 will inevitably rotate in the horizontal direction along with the float 402 during its up and down movement. In order to avoid the guide rod 401 from getting stuck with the upper and lower limit members, the guide rod 401 is configured to be cylindrical, and accordingly, the guide hole provided on the limit member is also circular.

[0033] In order to facilitate the detailed explanation of the scheme, the guide hole opened in the upper limit member 3 is set as the upper guide hole, the guide hole opened in the lower limit member 5 is set as the lower guide hole, the guide rod 401 located above the float 402 is the upper guide rod, and the guide rod 401 located below the float 402 is the lower guide rod.

[0034] The upper limit member 3 includes a strip plate 301 which is transversely arranged in the sulfur sealing tank body 1. A support block 303 is arranged in the sulfur sealing tank body 1. The strip plate 301 is supported on the support block 303, and the connection between the strip plate 301 and the support block 303 is fixedly connected by a first fixing bolt 302. An upper guide hole is provided in the middle of the strip plate 301 for the upper guide rod to be inserted. The diameter of the upper guide hole is slightly larger than the diameter of the upper guide rod. The strip plate 301 is mainly provided to form the upper guide hole so as to guide and constrain the upper guide rod. Therefore, the width of the strip plate 301 is larger than the diameter of the upper guide hole, so as to prevent the strip plate 301 from being too wide and interfering with the flow of liquid sulfur.

[0035] It is understandable that the upper limit member 3 can also be set as a guide ring distributed concentrically with the sulfur sealing tank body 1 and a connecting rod connected between the guide ring and the inner wall of the sulfur sealing tank body 1. The upper guide hole opened in the upper limit member 3 is the center hole of the guide ring. The inner wall of the sulfur sealing tank body 1 is provided with a support block 303 for supporting the connecting rod. The connecting rod and the support block 303 are connected by bolts. In order to maintain the stability of the upper limit member 3, the number of connecting rods is set to more than two, and a flow channel for liquid sulfur to flow downward is formed between adjacent connecting rods and the inner wall of the sulfur sealing tank body 1. As a specific setting mode, four connecting rods are set, and the four connecting rods are all arranged horizontally in the sulfur sealing tank body 1. Each connecting rod keeps one end connected to the inner wall of the sulfur sealing tank body 1 and the other end is fixed to the guide ring. The four connecting rods are located in the same horizontal plane and are vertically distributed to each other. In addition, the specific structure of the upper limit member 3 can also be set to other forms, and it is only necessary to ensure that the upper guide hole is formed, which will not be repeated here.

[0036] The lower stopper 5 includes a partition plate 502 disposed transversely in the sulfur sealing tank body 1 and a sealing pad 501 located on the upper side of the partition plate 502. The partition plate 502 has an inner diameter that is the same as or slightly smaller than the inner diameter of the sulfur sealing tank body 1. An annular support platform 506 is disposed along the circumference of the inner wall of the sulfur sealing tank body 1. The partition plate 502 is supported on the annular support platform 506 and fixed by a third fixing bolt 505. It should be noted that the annular support platform 506 is disposed on the inner wall of the sulfur sealing tank body 1 in order to stably support the partition plate 502. The annular support platform 506 may also be disposed as a plurality of support blocks distributed along the circumference of the inner wall of the sulfur sealing tank.

[0037] The sealing pad 501 is located on the upper side of the partition plate 502 and is concentrically distributed with the partition plate 502 . The sealing pad 501 and the partition plate 502 are connected by a second fixing bolt 504 .

[0038] A sealing plug 403 is arranged on the rod body of the lower guide rod. The sealing plug 403 is a cone with a downward tip and is fixed to the bottom of the float 402. A through hole is provided in the middle of the partition plate 502 and the sealing pad plate 501. The diameter of the through hole is smaller than the diameter of the large diameter end of the sealing plug 403. The through hole of the sealing pad plate 501 is a reduced diameter structure with a diameter gradually decreasing from top to bottom. The through hole provided in the sealing pad plate 501 is a liquid sulfur channel for liquid sulfur to flow. The utility model divides the inner cavity of the sulfur sealing tank body 1 into upper and lower parts by setting the partition plate 502 and the sealing pad plate 501. The floating drum 402 drives the sealing plug 403 to be inserted into or separated from the liquid sulfur channel of the sealing pad plate 501 under the action of the buoyancy of the liquid sulfur in the sulfur sealing tank body 1, so as to connect or block the liquid sulfur inlet 8 and the liquid sulfur outlet 6.

[0039] The sealing plug 403 and the sealing pad 501 are made of non-metallic materials that are resistant to high temperatures, liquid sulfur corrosion, and have good resilience. Such a design can ensure its reliability in extreme working environments.

[0040] The guide bracket 503 is a U-shaped bent plate, both ends of which are fixed to the lower plate surface of the partition plate 502, and the lower guide hole is opened in the middle of the bent plate. Alternatively, a guide bracket 503 is provided on the lower side of the partition plate 502, and the guide bracket 503 has a lower guide hole for the lower guide rod to pass through. The guide bracket 503 includes a plurality of vertical connecting rods fixed on the lower plate surface of the partition plate 502, and a connecting plate arranged at the end of the connecting rod, the connecting plate and the partition plate 502 are concentrically arranged, and the lower guide hole is opened in the middle of the connecting plate; as another arrangement of the guide bracket 503, the guide bracket 503 includes a plurality of inverted L-shaped connecting rods fixed on the lower plate surface of the partition plate 502, and the ends of the plurality of inverted L-shaped connecting rods away from the partition plate 502 converge toward the center line of the sulfur sealing tank and are connected to a guide ring, and the lower guide hole is the inner hole of the guide ring; in short, the arrangement of the guide bracket 503 is to form a lower guide hole below the partition plate 502, and its specific structure will not be repeated one by one.

[0041] During use, as the amount of liquid sulfur in the sulfur sealing tank body 1 varies, the float 402 will float up and down under the buoyancy of the liquid sulfur. When the liquid sulfur level is low and the buoyancy is less than the gravity of the float 402, the float 402 sinks to insert the sealing plug 403 into the liquid sulfur channel on the sealing pad 501, blocking the flow of liquid sulfur in the sulfur sealing tank body 1, and also preventing the process gas from entering the subsequent device; when the liquid sulfur level rises and the buoyancy is greater than the gravity of the float 402, the float 402 rises to separate the sealing plug 403 from the sealing pad 501, and the liquid sulfur can flow into the bottom of the sulfur sealing tank body 1 from the liquid sulfur channel of the sealing pad 501 and the through hole of the partition plate 502, and flow to the subsequent device through the liquid sulfur outlet 6. When the float 402 floats up and down, the guide hole can limit and guide the guide rod 401, so that it can move vertically up and down, avoiding the horizontal shaking of the float 402 and the deviation phenomenon. The cooperation of the sealing plug 403 and the sealing pad 501 connects or blocks the flow of liquid sulfur in the sulfur sealing tank body 1. In addition, the upper limit member 3 and the lower limit member 5 can also limit the upward and downward movement of the float valve assembly 4, preventing the guide rod 401 from being separated from the corresponding guide hole during the floating process of the float valve assembly 4.

[0042] Liquid sulfur usually contains some impurities, and during long-term operation, it is inevitable that sedimentation, precipitation and crystallization will occur. These sediments may accumulate in the equipment, especially in the guide part of the float 402, which will lead to a decrease in the performance of the equipment or even failure. The utility model adopts a point contact design between the float 402 and the guide bracket 503. The guide structure adopted is to allow the guide rod 401 on the float 402 to pass through the guide hole of the limiter. The contact area between the movable part guide rod 401 and the fixed part guide hole is very small. This design feature is that its shear resistance is relatively small, so it can effectively prevent the float 402 from getting stuck, ensuring that the equipment can continue to operate stably. Even if there are impurities deposited in the contact area, it only needs to overcome a small shear resistance to operate normally, so it can effectively prevent the float 402 from getting stuck.

[0043] A filter 2 is provided at the upper part of the upper limit member 3 in the sulfur sealing tank body 1. The filter 2 is a filter net. An annular boss 7 for supporting the filter 2 is provided in the sulfur sealing tank body 1. The filter 2 is located below the liquid sulfur inlet 8. The filter 2 filters the impurities in the liquid sulfur, which not only ensures the quality of the liquid sulfur in the system, but also can prevent the impurities from entering the contact between the guide rod and the limit member to a certain extent, affecting the normal use of the device.

[0044] The sulfur sealing tank body 1 is also equipped with a jacket, a heating pipe or an electric heating system on the outside to maintain the tank body temperature and prevent the liquid sulfur from solidifying. This is the prior art and will not be described in detail here.

[0045] like Figure 3As shown, the float valve type sulfur sealing tank of the utility model is applied in the liquid sulfur system. The height of the float valve type sulfur sealing tank is only 1 / 4 of the traditional sulfur sealing tank. The reduction in height makes the sulfur sealing tank change from underground equipment to above-ground equipment, avoiding many disadvantages of setting up sulfur sealing pits. The reduction in the height of the sulfur sealing tank can make the downstream liquid sulfur storage tank become above-ground equipment or semi-buried equipment, reducing the construction cost of the sulfur pool and making operation and maintenance more convenient. The float valve type sulfur sealing tank can be directly installed on the pipe mouth of the liquid sulfur storage tank, so that the whole system has better airtightness, which can effectively prevent the leakage of harmful gases and is more convenient for replacement and maintenance.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A floating valve type sulfur sealing tank, comprising a vertical sulfur sealing tank body (1), characterized in that: A liquid sulfur inlet (8) and a liquid sulfur outlet (6) are provided on the side wall of the sulfur sealing tank body (1), and the liquid sulfur inlet (8) is located above the liquid sulfur outlet (6); A lower limiter (5), a float valve assembly (4) and an upper limiter (3) are sequentially arranged in the sulfur sealing tank body (1) from bottom to top; The float valve assembly (4) comprises a float (402) and a guide rod (401) fixed on the float (402), and two ends of the guide rod (401) are respectively slidably arranged on the upper limit member (3) and the lower limit member (5); The lower limit member (5) comprises a partition plate (502), a sealing pad (501) located on the upper side of the partition plate (502), and a guide bracket (503) located on the lower side of the partition plate (502); the sealing pad (501) is located above the liquid sulfur outlet (6) and a liquid sulfur channel is provided on the sealing pad (501); and a sealing plug (403) capable of blocking the liquid sulfur channel is provided on the float valve assembly (4).

2. A floating valve type sulfur sealing tank according to claim 1, characterized in that: The sealing plug (403) is arranged at the bottom of the buoy (402).

3. A floating valve type sulfur sealing tank according to claim 1, characterized in that: The sealing plug (403) is arranged on the guide rod (401) below the buoy (402).

4. A floating valve type sulfur sealing tank according to claim 1, characterized in that: The sealing plug (403) is in a tapered shape with the tip pointing downward.

5. A floating valve type sulfur sealing tank according to claim 1, characterized in that: The guide bracket (503) is fixed on the partition plate (502), and the guide bracket (503) has a guide hole for the guide rod (401) to pass through.

6. A floating valve type sulfur sealing tank according to claim 1, characterized in that: The upper limit member (3) is provided with a guide hole for the guide rod (401) to pass through.

7. A floating valve type sulfur sealing tank according to claim 1, characterized in that: The guide rod (401) is inserted into the buoy (402), and the guide rod (401) and the buoy (402) are coaxially arranged.

8. The floating valve type sulfur sealing tank according to claim 1, characterized in that: The guide rod (401) comprises an upper guide rod and a lower guide rod which are coaxially arranged.

9. A floating valve type sulfur sealing tank according to claim 1, characterized in that: A filter (2) is arranged in the sulfur sealing tank body (1) between the liquid sulfur inlet (8) and the upper limit member (3).

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