A connector and a wet acid production apparatus

Abstract

This utility model relates to the field of wet acid production technology, and particularly to a connector and a wet acid production device. The connector is a hollow cylindrical structure with a hollow channel for conveying materials. A first flange is formed on the connector, and the first flange has a first air inlet. The wall of the hollow channel of the connector has an interlayer that communicates with the first air inlet, and the interlayer is open at the end of the wall along the conveying direction of the hollow channel. This utility model solves the problem in existing wet acid production processes where process flue gas easily condenses into hot sulfuric acid when it enters the condenser inlet through a pipeline, corroding the connecting flange at the condenser inlet, causing corrosion damage to the condenser, which is irreparable and eventually leads to its scrapping and replacement.

Description

Technical Field

[0001] This utility model relates to the field of wet acid production technology, and in particular to a connector and a wet acid production device. Background Technology

[0002] The condenser is one of the key pieces of equipment in a wet acid production unit. It consists of multiple sets of parallel glass tubes, each equipped with a glass spiral column and a demister. Sulfur trioxide and water vapor contained in the process gas exit from the SO2 converter and enter the condenser from the bottom through pipes. The gas flows upwards through the tubes, while air flows through the shell side, undergoing heat exchange and cooling condensation. The condensed air produces hot sulfuric acid at approximately 250°C and a concentration of 98%, which flows down the glass tube wall into the acid collection tank at the bottom. The cooled and condensed process exhaust gas meets emission standards and is discharged through the chimney.

[0003] In wet sulfuric acid production processes, the flue gas consistently contains water vapor, filling the equipment and pipelines. Especially as it enters the condenser inlet, sulfuric acid begins to condense because the temperature at this inlet is below the sulfuric acid dew point. SO3 and water vapor begin to condense into hot sulfuric acid, which corrodes the condenser inlet flange. The high-temperature sulfuric acid is highly corrosive, and almost no metal material can withstand it, leading to irreparable damage to the condenser, ultimately requiring replacement. Therefore, this utility model proposes a connector and a wet acid production device. Utility Model Content

[0004] The utility model of this invention provides a connector and a wet acid production device, which mainly solves the problem in the existing wet acid production process that when the process flue gas enters the condenser inlet through the pipeline, it easily condenses to form hot sulfuric acid, which corrodes the connecting flange of the condenser inlet, causing corrosion damage to the condenser, making it irreparable and eventually requiring replacement.

[0005] This utility model proposes a connector, which is a hollow cylindrical structure with a hollow channel for conveying materials to pass through; A first flange is formed on the connector, and the first flange has a first air inlet hole; the cylinder wall of the hollow channel of the connector has a sandwich layer that communicates with the first air inlet hole, and the sandwich layer is open at the end of the cylinder wall along the conveying direction of the hollow channel.

[0006] Preferably, the connector further includes: The second flange is sequentially arranged on the connector along the conveying direction of the hollow channel with the first flange; the second flange is provided with a second air inlet that communicates with the interlayer and the first air inlet.

[0007] Preferably, there are several first air inlets, which are spaced apart along the circumference of the first flange; There are several second air inlets, which are spaced apart along the circumference of the second flange; The first flange and the second flange are arranged in parallel, and the second flange and the air inlet end of the hollow channel are arranged on the same plane. The first flange is arranged on the outer periphery of the middle section of the hollow channel.

[0008] Preferably, the outer diameter of the first flange is larger than the outer diameter of the second flange.

[0009] Preferably, the first flange and the second flange are each provided with a number of positioning holes, and the positioning holes are spaced apart along the circumferential direction on both the first flange and the second flange; the positioning holes are located on the outer edges of the first air inlet and the second air inlet.

[0010] Preferably, the outer edge of the first flange has a protruding lug and a support, and the lug and support are symmetrically distributed along the central axis of the first flange.

[0011] This utility model also proposes a wet acid production device, including the aforementioned connector, and further including a process flue gas pipeline and a condenser, wherein the process flue gas pipeline is detachably connected to the connector via a second flange on the connector. The condenser is detachably connected to the connector via a first flange on the connector, and the hollow channel of the connector, which protrudes from the first flange, extends into the condenser.

[0012] Preferably, it further includes: The first sealing element is interference-fitted between the outer wall of the hollow channel and the inner wall of the condenser; The second seal is interference-fitted between the first flange and the condenser. The first air inlet is located between the horizontal planes where the first seal and the second seal are located.

[0013] Preferably, the first air inlet and the second air inlet are connected to an inert gas storage device.

[0014] Preferably, a protective layer is provided on the inner wall of the end of the condenser facing the connector; The top end face of the protective layer, which is located at the bottom of the connector along the direction of gravity, has a downwardly sloping surface.

[0015] As can be seen from the above, the following beneficial effects can be obtained by applying the technical solution provided by this utility model: First, the connector and wet acid production device including the connector proposed in this utility model reduce the corrosion of the condenser connection flange by process flue gas and hot sulfuric acid through the connector of a specific shape, reduce the maintenance frequency, and improve the operational stability of the device. Secondly, in the connector and wet acid production device including the connector proposed in this utility model, the gap between the condenser and the connector is sealed by the setting of the first seal and the second seal. When the unit is stopped for maintenance periodically, only the filler of the first seal and the second seal needs to be replaced, which reduces the maintenance difficulty and maintenance cost. Third, in the connector and wet acid production device including the connector proposed in this utility model, inert gas is also supplied to both sides of the first sealing member and the second sealing member. Under the premise that the first sealing member and the second sealing member are insufficient, the inert gas is used for secondary sealing to blow the process flue gas into the condenser, thereby avoiding sulfuric acid condensation and further improving the service life of the wet acid production device. Fourth, in the connector and wet acid production device including the connector proposed in this utility model, the input of inert gas can also cool and protect the first sealing element and the second sealing element and the cylinder wall of the hollow channel, thereby improving the service life of the wet acid production device in high temperature environment. Fifth, in the wet acid production device proposed in this utility model, a protective layer is provided inside the condenser, which can protect the foam bricks at the bottom, reduce the corrosion of the foam bricks by acid, and improve the service life of the condenser in the wet acid production device. Sixth, in the wet acid production device proposed in this utility model, the protective layer at the bottom of the condenser is inclined, which allows the sulfuric acid formed by condensation to slide into the interior of the condenser along the inclined surface, reducing corrosion to the connecting parts or the flange at the end of the condenser. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the connector structure in Embodiment 1 of this utility model; Figure 2 This is a structural diagram and a cross-sectional view of the connector in Embodiment 1 of this utility model; Figure 3 This is a schematic diagram of the connecting parts and condenser assembly structure of the wet acid production device in Embodiment 2 of this utility model; Figure 4 for Figure 3 Enlarged view of part A in the image; Figure 5 for Figure 3 Enlarged view of part B in the image. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0019] In existing wet acid production processes, when process flue gas enters the condenser inlet through pipelines, it easily condenses to form hot sulfuric acid, which corrodes the connecting flange at the condenser inlet, causing corrosion damage to the condenser that cannot be repaired and eventually has to be scrapped and replaced.

[0020] Example 1 like Figure 1 and Figure 2 As shown, in order to solve the above problems, this embodiment proposes a connector 100, which is a hollow cylindrical structure with a hollow channel 130 for conveying materials to pass through; a first flange 110 is formed on the connector 100, and the first flange 110 has a first air inlet 111; the cylindrical wall of the hollow channel 130 on the connector 100 has an interlayer that communicates with the first air inlet 111, and the interlayer is set as an open surface at the end of the cylindrical wall along the conveying direction of the hollow channel 130.

[0021] Preferably, in this embodiment, the hollow channel 130 is arranged in a cylindrical channel, and the first flange 110 is arranged to protrude vertically from the outer wall of the cylindrical channel.

[0022] Preferably, in this embodiment, the conveying material of the connector 100 is gas.

[0023] Preferably, in this embodiment, there are four first air inlets 111, which are symmetrically and evenly distributed on the first flange. It is not limited to the fact that the first air inlets 111 are connected to an inert gas, so that the interlayer and the area where the first air inlets 111 are located are filled with inert gas.

[0024] Preferably, in this embodiment, the connector 100 is constructed of carbon steel covered with PTFE plate, wherein the first flange is 200mm thick, the hollow channel 130 of the connector 100 is 3mm thick, and it is made of PTFE material.

[0025] More specifically, the connector 100 is also provided with a second flange 120; the second flange 120 and the first flange 110 are sequentially arranged on the connector 100 along the conveying direction of the hollow channel 130; the second flange 120 is provided with a second air inlet 121 that communicates with the interlayer and the first air inlet 111.

[0026] Preferably, in this embodiment, there are four second air inlets 121, which are symmetrically and evenly distributed on the second flange 120. It is not limited to the fact that any one of the first air inlets 111 is located on the extension line of the straight line between the center of the second flange 120 and the line containing any one of the second air inlets 121.

[0027] Preferably, in this embodiment, the diameter of the second air inlet 121 is equal to that of the first air inlet 111.

[0028] Preferably, in this embodiment, the outer diameter of the first flange 110 is larger than the outer diameter of the second flange 120.

[0029] Preferably, in this embodiment, the material of the second flange 120 is the same as that of the first flange 110, both of which are made of carbon steel covered with PTFE sheet.

[0030] In this embodiment, the air inlets provided on the first flange 110 and the second flange 120 are used to fill the interlayer of the hollow channel 130 with inert gas or other components of gas, so as to accelerate the gas transport rate of the hollow channel 130 and avoid reverse gas transmission.

[0031] More specifically, the first flange 110 and the second flange 120 are arranged in parallel, and the second flange 120 and the air inlet end of the hollow channel 130 are arranged on the same plane; the first flange 110 is located on the outer periphery of the middle section of the hollow channel 130.

[0032] In this embodiment, when the first flange 110 is connected to an external pipe, the connector 100 is directly abutted against the external pipe. When the second flange 120 is connected to an external structure, the hollow channel 130 on the connector 100 extends into the external structure, which is usually a condenser. Therefore, the end of the connector 100 extending into the condenser can prevent hot sulfuric acid formed by condensation at the end of the condenser from seeping out along the gap and corroding the connector 100.

[0033] More specifically, a number of positioning holes are formed on the first flange 110 and the second flange 120 respectively, and the positioning holes are spaced apart along the circumferential direction on the first flange 110 and the second flange 120; the positioning holes are located on the outer edge of the first air inlet 111 and the second air inlet 121.

[0034] Preferably, in this embodiment, the positioning hole is used for bolt insertion and fixing.

[0035] Preferably, in this embodiment, the positioning holes on the first flange 110 and the positioning holes on the second flange 120 have the same diameter.

[0036] More specifically, the outer edge of the first flange 110 has a protrusion forming a lifting lug 150 and a support 140, and the lifting lug 150 and the support 140 are symmetrically distributed along the central axis of the first flange 110.

[0037] Preferably, in this embodiment, the support 140 is disposed at the bottom end of the connector 100, and the lug 150 is disposed at the top end of the connector 100.

[0038] Preferably, in this embodiment, there are two supports 140, which are identical in structure and arranged in parallel; and two lugs 150, which are identical in structure and arranged in parallel.

[0039] In this embodiment, the lifting lug 150 and support 140 on the first flange 110 can ensure the setting height of the first flange 110 with the connector 100, and prevent the connector 100 from sagging due to its own weight, causing misalignment of the sealing surface, or even leakage of gaps, thus losing its sealing function.

[0040] Example 2 like Figures 3-5 As shown, in order to solve the aforementioned problems, this embodiment proposes a wet acid production device, including the connector 100 of Embodiment 1, and also including a process flue gas duct and a condenser 200. The process flue gas duct is detachably connected to the second flange 120 on the connector 100; the condenser 200 is detachably connected to the first flange 110 on the connector 100, and the hollow channel 130 of the connector 100 protruding from the first flange 110 extends into the condenser 200.

[0041] Preferably, in this embodiment, the length difference between the hollow channel 130 extending into the condenser 200 and the inside of the condenser 200 does not exceed 50mm, to prevent the glass tube inside the condenser 200 from breaking and falling down and damaging the PTFE plate due to excessive insertion.

[0042] In this embodiment, since the hollow channel 130 on the upper part of the connector 100 extends into the condenser 200, it can effectively guide the process flue gas into the condenser 200, reducing the possibility of overflow or backflow. At the same time, the part of the hollow channel 130 extending into the end of the condenser 200 can effectively protect the open end of the condenser 200, preventing the hot sulfuric acid formed by condensation from corroding the open end of the condenser 200.

[0043] More specifically, it also includes a first seal 310 and a second seal 320; the first seal 310 is interference-fitted between the outer wall of the hollow channel 130 and the inner wall of the condenser 200; the second seal 320 is interference-fitted between the first flange 110 and the condenser 200; and the first air inlet 111 is located between the horizontal planes where the first seal 310 and the second seal 320 are located.

[0044] Preferably, in this embodiment, both the first sealing element 310 and the second sealing element 320 are made of soft PTFE material. The first sealing element 310 is preferably a 30cm soft PTFE sealing gasket, and the second sealing element 320 is preferably a sealing strip.

[0045] In this embodiment, by providing the first sealing element 310 and the second sealing element 320, the possibility of hot sulfuric acid formed by condensation seeping outward along the gap between the condenser 200 and the connector 100, thereby corroding the end of the condenser 200 or other parts of the connector 100, can be eliminated.

[0046] More specifically, the first air inlet 111 and the second air inlet 121 should be connected to an inert gas storage device.

[0047] Preferably, nitrogen is used as the inert gas in this embodiment.

[0048] Preferably, in this embodiment, the injection pressure of the inert gas storage device is about 0.5 kPa, ensuring that it is always higher than the pressure of the condenser 200, thus achieving the function of nitrogen sealing.

[0049] In this embodiment, the first air inlet 111 and the second air inlet 121 on the connector 100 are distributed on both sides of the inner and outer pipe sealing strips. When the sealing strip packing cannot block it, the inert gas pressure is higher than the process flue gas pressure, so the process flue gas is blown into the pit condensation system. There will be no leakage and condensation to cause corrosion. In addition, because the inert gas at room temperature has a cooling protection effect on the sealing strip and PTFE plate, the sealing strip and PTFE plate will not be damaged due to high temperature.

[0050] More specifically, a protective layer 210 is provided inside the end of the condenser 200 facing the connector 100; the top end face of the protective layer 210, which is located at the bottom of the connector 100 along the direction of gravity, forms a downwardly inclined slope.

[0051] Preferably, in this embodiment, the protective layer 210 is an acid-resistant brick structure used to protect the foam brick structure inside it.

[0052] Preferably, in this embodiment, the slope of the top end face of the protective layer 210 at the bottom of the condenser 200 is a downward slope sloping toward the inside of the condenser 200. It is not limited to the slope angle being 15°.

[0053] In this embodiment, the protective layer 210 can be used to attach a sealing strip to prevent the foam bricks on the cylinder wall of the condenser 200 from being corroded during acid condensation. It protects the foam bricks and thus maintains the structural integrity of the condenser 200. The inclined surface is provided so that when acid condenses, it flows into the condenser 200 along the inclined surface and does not flow into the flange surface connected to the connector 100.

[0054] In summary, Embodiments 1 and 2 present a connector and a wet acid production device. By using a connector of a specific shape, the edge gaps of the condenser in the assembled wet acid production device are effectively blocked. Furthermore, by injecting inert gas and attaching sealing elements, the sealing effect of the edge gaps can be further improved, thereby extending the service life of the wet acid production device.

[0055] The embodiments described above do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the above embodiments should be included within the scope of protection of this technical solution.

Claims

1. A connector, characterized in that: The connector is a hollow cylindrical structure with a hollow channel for conveying materials to pass through; A first flange is formed on the connector, and the first flange has a first air inlet hole; the cylinder wall of the hollow channel of the connector has a sandwich layer that communicates with the first air inlet hole, and the sandwich layer is open at the end of the cylinder wall along the conveying direction of the hollow channel.

2. A connector according to claim 1, characterized in that, The connector also includes: The second flange is sequentially arranged on the connector along the conveying direction of the hollow channel with the first flange; the second flange is provided with a second air inlet that communicates with the interlayer and the first air inlet.

3. A connector according to claim 2, characterized in that: There are several first air inlets, which are spaced apart along the circumference of the first flange. There are several second air inlets, which are spaced apart along the circumference of the second flange; The first flange and the second flange are arranged in parallel, and the second flange and the air inlet end of the hollow channel are arranged on the same plane. The first flange is arranged on the outer periphery of the middle section of the hollow channel.

4. A connector according to claim 3, characterized in that: The outer diameter of the first flange is larger than the outer diameter of the second flange.

5. A connector according to claim 4, characterized in that: The first flange and the second flange each have a number of positioning holes, and the positioning holes are spaced apart along the circumferential direction on both the first flange and the second flange; the positioning holes are located on the outer edge of the first air inlet and the second air inlet.

6. A connector according to claim 5, characterized in that: The outer edge of the first flange has protruding lugs and supports, and the lugs and supports are symmetrically distributed along the central axis of the first flange.

7. A wet acid production apparatus, comprising the connecting member as described in any one of claims 1 to 6, and further comprising a process flue gas duct and a condenser, characterized in that: The process flue gas duct is detachably connected to the second flange on the connector. The condenser is detachably connected to the first flange on the connector, and the hollow channel of the connector, which protrudes from the first flange, extends into the condenser.

8. A wet acid production apparatus according to claim 7, characterized in that, Also includes: The first sealing element is interference-fitted between the outer wall of the hollow channel and the inner wall of the condenser; The second seal is interference-fitted between the first flange and the condenser; The first air inlet is located between the horizontal planes where the first seal and the second seal are located.

9. A wet acid production apparatus according to claim 8, characterized in that: The first air inlet and the second air inlet are connected to an inert gas storage device.

10. A wet acid production apparatus according to any one of claims 7 to 9, characterized in that: A protective layer is provided on the inner wall of the end of the condenser facing the connector; The top end face of the protective layer located at the bottom of the condenser along the direction of gravity has a downward sloping surface.

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