Tail gas breathing tank for concentrated sulfuric acid storage tank

Abstract

The tail gas breathing tank for the concentrated sulfuric acid storage tank comprises a tank body, a tail gas pipe, a feeding pipe, a gas phase pipe and a sight glass, the tail gas pipe, the feeding pipe, the gas phase pipe and the sight glass are located on the outer wall of the tank body, a steel plate is horizontally arranged in the tank body and divides the tank body into a liquid storage area on the lower portion and a filler area on the upper portion, and adsorptive filler is arranged in the filler area. One side of the steel plate is a sealing steel plate, the other side of the steel plate is a grating steel plate, a vertically downward inner partition plate is arranged at the connecting point of the sealing steel plate and the grating steel plate, a solution cavity for storing a water-absorbing solution is arranged below the liquid storage area, and the lowest point of the inner partition plate is lower than the standard liquid level of the water-absorbing solution; the sight glass corresponds to a standard liquid level, one end of the tail gas pipe is communicated with the tail gas side cavity, the other end of the tail gas pipe is used for being communicated with a concentrated sulfuric acid storage tank, the feeding pipe is communicated below the grating steel plate, and the gas phase pipe is communicated above the filler area. According to the concentrated sulfuric acid storage tank, tail gas of the concentrated sulfuric acid storage tank can meet environmental protection requirements when being discharged into the atmosphere, and air sucked into the concentrated sulfuric acid storage tank does not contain moisture, so that the problem that the concentrated sulfuric acid storage tank is corroded is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical production, in particular to a tail gas breathing tank for a concentrated sulfuric acid storage tank. Background Art

[0002] Concentrated sulfuric acid is often used in fine chemical production. Concentrated sulfuric acid is highly acidic, highly oxidizing, hygroscopic, dehydrating, and non-volatile. Whether it is the concentrated sulfuric acid transfer tank in the workshop, the high-level tank or the concentrated sulfuric acid storage tank in the tank area, the material is usually carbon steel. The tail gas of the storage tank is generally directly connected to the atmosphere. Due to the hygroscopicity of concentrated sulfuric acid, it can absorb water molecules in gas and liquid and crystal water in solid. In this way, once the liquid level of the storage tank drops, the concentrated sulfuric acid remaining on the tank wall will absorb water molecules in the air and be diluted into dilute sulfuric acid. Dilute sulfuric acid will corrode the oxide film on the carbon steel and metal surface and thus corrode the equipment. Over time, it is easy to cause equipment leakage. Utility Model Content

[0003] In order to solve the above problems in the prior art, the utility model provides an exhaust gas breathing tank for a concentrated sulfuric acid storage tank, which can avoid the problem of corrosion of the concentrated sulfuric acid storage tank.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] In the first aspect, the utility model provides an exhaust breathing tank for a concentrated sulfuric acid storage tank, comprising a tank body and an exhaust pipe, a feeding pipe, a gas phase pipe and a sight glass located on the outer wall of the tank body, a steel plate is horizontally arranged inside the tank body, the steel plate divides the tank body into a lower liquid storage area and an upper filler area, an absorbent filler capable of adsorbing sulfuric acid gas and moisture is arranged in the filler area, one side of the steel plate is a sealing steel plate and the other side is a grid steel plate, a vertical downward inner partition is arranged at the connection point of the sealing steel plate and the grid steel plate, below the liquid storage area is a solution cavity for storing a water-absorbing solution, and the lowest point of the inner partition is lower than the standard liquid level of the water-absorbing solution;

[0006] The sight glass corresponds to the standard liquid level, one end of the tail gas pipe is connected to the tail gas side cavity between the sealing steel plate and the standard liquid level and the other end is used to connect to the concentrated sulfuric acid storage tank, the feeding pipe is connected to the bottom of the grid steel plate, and the gas phase pipe is connected to the top of the filling area.

[0007] The beneficial effect of the utility model is that since the tail gas pipe on the concentrated sulfuric acid storage tank is connected with the tail gas pipe on the tail gas breathing tank, when the tail gas on the concentrated sulfuric acid storage tank enters the tail gas breathing tank, the adsorptive filler absorbs trace amounts of sulfuric acid gas in the tail gas, ensuring that the tail gas discharged into the atmosphere meets environmental protection requirements; at the same time, when the concentrated sulfuric acid storage tank wants to inhale air, the moisture in the air will be absorbed by the adsorptive filler and the water-absorbing solution, ensuring that the air inhaled into the concentrated sulfuric acid storage tank does not contain moisture, thereby avoiding the problem of corrosion of the concentrated sulfuric acid storage tank.

[0008] Optionally, it further includes a sampling tube and a sampling ball valve, wherein the sampling tube is located on the outer wall of the tank body and is connected to the solution cavity below the standard liquid level, and the sampling ball valve is arranged on the sampling tube.

[0009] Optionally, a feeding ball valve is provided on the feeding pipe.

[0010] Optionally, an overflow pipe and an overflow ball valve are further included. The overflow pipe is located on the outer wall of the tank body and is connected to a position flush with the standard liquid level. The overflow ball valve is arranged on the overflow pipe.

[0011] Optionally, it further includes a drain pipe and a drain ball valve, wherein the drain pipe is located on the outer wall of the tank body and is connected to the bottom of the liquid storage area, and the drain ball valve is arranged on the drain pipe.

[0012] Optionally, the area of ​​the sight glass on the outer wall of the tank body is such that the horizontal center axis of the sight glass is flush with the standard liquid level.

[0013] Optionally, the top of the tank body is a detachable cover.

[0014] According to the above description, the adsorbent filler can be replaced through the detachable cover to ensure the adsorption effect.

[0015] Optionally, the adsorptive filler is a honeycomb activated carbon filler with a thickness of 50-300 mm, and the water-absorbent solution is concentrated sulfuric acid. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of a tail gas breathing tank for a concentrated sulfuric acid storage tank according to an embodiment of the utility model;

[0017] [Description of Reference Numerals]

[0018] 1. Tank body; 11. Bottom plate; 12. Removable cover plate; 13. Sight glass; 14. Sealing steel plate; 15. Grid steel plate; 16. Inner partition plate; 17. Honeycomb activated carbon filler;

[0019] 2. Exhaust pipe;

[0020] 3. Feeding pipe; 31. Feeding ball valve;

[0021] 4. Gas phase tube;

[0022] 5. Sampling tube; 51. Sampling ball valve;

[0023] 6. Overflow pipe; 61. Overflow ball valve;

[0024] 7. Drainage pipe; 71. Drainage ball valve;

[0025] A, liquid storage area; A1, tail gas side cavity; A2, atmosphere side cavity; A3, solution cavity;

[0026] B. Filling area. DETAILED DESCRIPTION

[0027] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0028] Embodiment 1

[0029] Please refer to Figure 1 The embodiment provides an exhaust gas breathing tank for a concentrated sulfuric acid storage tank, comprising a tank body 1 and an exhaust gas pipe 2, a feeding pipe 3, a gas phase pipe 4, a sight glass 13, a sampling tube 5, an overflow pipe 6 and a drain pipe 7 located on the outer wall of the tank body 1.

[0030] like Figure 1 As shown, the tank body 1 is arranged on a bottom plate 11, in which a steel plate is horizontally arranged, and the steel plate divides the tank body 1 into a lower liquid storage area A and an upper filler area B, and the filler area B is provided with an absorbent filler capable of adsorbing sulfuric acid gas and moisture, one side of the steel plate is a sealing steel plate 14 and the other side is a grid steel plate 15, and a vertical downward inner partition 16 is arranged at the connection point of the sealing steel plate 14 and the grid steel plate 15, and below the liquid storage area A is a solution cavity A3 for storing a water-absorbing solution, and the lowest point of the inner partition 16 is lower than the standard liquid level of the water-absorbing solution, so that the upper part of the liquid storage area A is divided into an atmosphere side cavity A2 and an exhaust gas side cavity A1;

[0031] In this embodiment, the top of the tank body 1 is a detachable cover plate 12, through which the adsorbent filler can be replaced to ensure the adsorption effect. In this embodiment, the adsorbent filler is a honeycomb activated carbon filler 17 with a thickness of 200 mm, and its optional thickness is 50-300 mm; in this embodiment, the water-absorbing solution is concentrated sulfuric acid. In this embodiment, the lower part of the inner partition 16 extends into the standard liquid level by 50 mm.

[0032] Among them, the sight glass 13 corresponds to the standard liquid level. In this embodiment, the area of ​​the sight glass 13 on the outer wall of the tank body 1 is such that the horizontal center axis of the sight glass 13 is flush with the standard liquid level. The sight glass 13 is used to observe the liquid level in the liquid storage tank.

[0033] Among them, one end of the tail gas pipe 2 is connected to the tail gas side cavity A1 between the sealing steel plate 14 and the standard liquid level and the other end is used to connect to the concentrated sulfuric acid storage tank, the feeding pipe 3 is connected to the bottom of the grid steel plate 15, the gas phase pipe 4 is connected to the top of the filling area B, the sampling tube 5 is connected to the solution cavity A3 below the standard liquid level, the overflow pipe 6 is connected to the position flush with the standard liquid level, and the drain pipe 7 is connected to the bottom of the storage area A. In this embodiment, the overflow pipe 6 is connected to the drain pipe 7, and their common outlet is used to dock with the movable collection tank body 1. The movable collection tank body 1 is placed on site, but is only used when drainage is needed.

[0034] At the same time, a feeding ball valve 31 is provided on the feeding pipe 3, a sampling ball valve 51 is provided on the sampling pipe 5, an overflow ball valve 61 is provided on the overflow pipe 6, and a drain ball valve 71 is provided on the drain pipe 7. The ball valves are used to control the opening and closing of the pipelines, thereby realizing feeding, sampling, overflow control and draining.

[0035] Reference Figure 1 The present embodiment provides a specific example of an exhaust breathing tank, which is a device with an overall size of 400*900mm, wherein the size of the liquid storage area A is 400*650mm, the size of the filling area B is 400*200mm, and the gas phase pipe 4 is a DN150 gas phase pipe 4.

[0036] Among them, concentrated sulfuric acid storage tanks include concentrated sulfuric acid transfer tanks in workshops, high-level tanks or concentrated sulfuric acid storage tanks in tank areas.

[0037] Therefore, the operation process of this embodiment is described as follows:

[0038] (1) Preparation stage: A honeycomb activated carbon filler 17 with a thickness of 200 mm is loaded into the filler box through the removable cover plate 12, and then the removable cover plate 12 is locked;

[0039] (2) Feeding stage: Ensure that the overflow ball valve 61, the drain ball valve 71, and the sampling ball valve 51 are in the closed state, then open the feeding ball valve 31, and add concentrated sulfuric acid with a mass content of 98% into the solution cavity A3 through the feeding pipe 3. Observe the liquid level inside the solution cavity A3 through the sight glass 13. When the liquid level exceeds the middle of the sight glass 13, close the feeding ball valve 31 to stop feeding, then open the overflow ball valve 61, and let the excess concentrated sulfuric acid be discharged into the movable collection tank through the overflow pipe 6 to ensure that the normal liquid level of the solution cavity A3 is exactly in the middle of the sight glass 13, and then close the overflow ball valve 61.

[0040] (3) Exhalation stage: When the concentrated sulfuric acid storage tank is charged, its exhaust gas enters the exhaust side cavity A1 through the exhaust pipe 2. When the concentrated sulfuric acid storage tank is charged too fast at a certain moment, causing the pressure to rise to more than 1803Pa, the exhaust gas in the exhaust side cavity A1 will break through the liquid seal and enter the atmosphere side cavity A2, and then pass through the grid steel plate 15, the honeycomb activated carbon filler 17, and the DN150 gas phase pipe 4 in sequence to be discharged into the atmosphere. During the exhaust process, trace amounts of sulfuric acid gas will be absorbed by the activated carbon to ensure that the exhaust gas discharged into the atmosphere meets environmental protection requirements.

[0041] (4) Inhalation stage: When the concentrated sulfuric acid storage tank is discharged, causing the pressure to drop by more than 1803Pa, the air in the atmosphere enters the packing area B through the DN150 gas phase pipe 4. In the process of passing through the activated carbon packing layer, part of the moisture in the air will be absorbed, and then enter the atmosphere side cavity A2. Under the action of the pressure difference, the air breaks through the liquid seal and enters the tail gas side cavity A1. In the process of the air breaking through the liquid seal, the remaining moisture in the air is absorbed by the concentrated sulfuric acid in the solution cavity A3, and finally enters the concentrated sulfuric acid storage tank through the tail gas pipe 2, ensuring that the air inhaled by the concentrated sulfuric acid storage tank does not contain moisture.

[0042] At the same time, during the production process, the staff regularly observes the sight glass 13. When the real-time liquid level is full of the sight glass 13, the sampling ball valve 51 is opened, and the liquid in the solution cavity A3 is collected through the sampling tube 5 for detection. When the detection result shows that the mass content of concentrated sulfuric acid is less than 90%, the drain ball valve 71 is opened, and the liquid in the solution cavity A3 is discharged into the movable collection tank through the drain pipe 7. After the liquid in the solution cavity A3 is emptied, the feeding is completed as described in the feeding stage. When the liquid detection result in the solution cavity A3 shows that the mass content of concentrated sulfuric acid is higher than 90%, the overflow ball valve 61 is opened to allow the excess concentrated sulfuric acid to be discharged into the movable collection tank through the overflow pipe 6, ensuring that the normal liquid level of the solution cavity A3 is exactly in the middle of the sight glass 13, and then the overflow ball valve 61 is closed.

[0043] At the same time, the adsorption of the honeycomb activated carbon filler 17 in the packing layer can be judged by observing the pressure of the concentrated sulfuric acid storage tank to determine whether it needs to be replaced. When the real-time liquid level is in the middle of the sight glass 13 and there is no inlet or outlet of the concentrated sulfuric acid storage tank, the honeycomb activated carbon filler 17 needs to be replaced when the pressure on the concentrated sulfuric acid storage tank is greater than 2100 Pa. At this time, open the detachable cover plate 12, take out the honeycomb activated carbon filler 17, fill the new honeycomb activated carbon filler 17 into the filler, and then lock the detachable cover plate 12 to complete the replacement of the filler.

[0044] In summary, this embodiment can ensure that the tail gas on the concentrated sulfuric acid storage tank meets environmental protection requirements when it is discharged into the atmosphere; and ensure that the air inhaled into the concentrated sulfuric acid storage tank does not contain moisture, thereby avoiding the problem of corrosion of the concentrated sulfuric acid storage tank. Moreover, the tail gas breathing tank of this embodiment occupies a small area, has low cost, does not need to modify the original concentrated sulfuric acid storage tank, has low operating loss, long maintenance cycle, convenient material replacement, and simple operation for operators.

[0045] Therefore, it should be noted that the specific selection of each module in this embodiment is a specific example. In other equivalent embodiments, models that can meet the corresponding functions can be used for replacement.

[0046] In the description of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0047] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present utility model, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0049] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0050] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A tail gas breathing tank for a concentrated sulfuric acid storage tank, characterized in that: It comprises a tank body and an exhaust pipe, a feeding pipe, a gas phase pipe and a sight glass located on the outer wall of the tank body. A steel plate is horizontally arranged inside the tank body, and the steel plate divides the tank body into a lower liquid storage area and an upper filler area. The filler area is provided with an absorbent filler capable of adsorbing sulfuric acid gas and moisture. One side of the steel plate is a sealing steel plate and the other side is a grid steel plate. An inner partition plate vertically downward is arranged at the connection point between the sealing steel plate and the grid steel plate. Below the liquid storage area is a solution cavity for storing a water-absorbing solution, and the lowest point of the inner partition plate is lower than the standard liquid level of the water-absorbing solution. The sight glass corresponds to the standard liquid level, one end of the tail gas pipe is connected to the tail gas side cavity between the sealing steel plate and the standard liquid level and the other end is used to connect to the concentrated sulfuric acid storage tank, the feeding pipe is connected to the bottom of the grid steel plate, and the gas phase pipe is connected to the top of the filling area.

2. The tail gas breathing tank for a concentrated sulfuric acid storage tank according to claim 1, characterized in that: It also includes a sampling tube and a sampling ball valve. The sampling tube is located on the outer wall of the tank body and is connected to the solution cavity below the standard liquid level. The sampling ball valve is arranged on the sampling tube.

3. The tail gas breathing tank for a concentrated sulfuric acid storage tank according to claim 1, characterized in that: The feeding pipe is provided with a feeding ball valve.

4. The tail gas breathing tank for a concentrated sulfuric acid storage tank according to claim 1, characterized in that: It also includes an overflow pipe and an overflow ball valve. The overflow pipe is located on the outer wall of the tank body and is connected to a position flush with the standard liquid level. The overflow ball valve is arranged on the overflow pipe.

5. The tail gas breathing tank for a concentrated sulfuric acid storage tank according to claim 1, characterized in that: It also includes a drain pipe and a drain ball valve. The drain pipe is located on the outer wall of the tank body and is connected to the bottom of the liquid storage area. The drain ball valve is arranged on the drain pipe.

6. A tail gas breathing tank for a concentrated sulfuric acid storage tank according to any one of claims 1 to 5, characterized in that: The area of ​​the sight glass on the outer wall of the tank body is such that the horizontal center axis of the sight glass is flush with the standard liquid level.

7. A tail gas breathing tank for a concentrated sulfuric acid storage tank according to any one of claims 1 to 5, characterized in that: The top of the tank body is a detachable cover plate.

8. A tail gas breathing tank for a concentrated sulfuric acid storage tank according to any one of claims 1 to 5, characterized in that: The adsorptive filler is a honeycomb activated carbon filler with a thickness of 50-300 mm, and the water-absorbing solution is concentrated sulfuric acid.

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