Tank arrangement for the metering of fuming sulfuric acid
By introducing a tail gas absorber and dual radar level gauges into the fuming sulfuric acid storage tank, the problem of inaccurate radar level gauge measurement was solved, achieving flue gas purification and accurate level measurement, thus meeting environmental protection requirements.
Patent Information
- Application Number
- CN202521520532.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-21
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-07-21
AI Technical Summary
In existing technologies, when radar level gauges measure the level of fuming sulfuric acid, the electromagnetic waves are scattered and absorbed by particles in the white fumes, resulting in inaccurate measurement results.
A storage tank device for metering fuming sulfuric acid was designed, comprising a tail gas absorber and a dual radar level gauge. The tail gas absorber uses a suction pump to introduce SO3 flue gas in the gas phase space into the tail gas absorption chamber for purification, and uses concentrated sulfuric acid and ceramic balls for absorption. The dual radar level gauge provides redundancy backup.
It effectively reduces the interference of flue gas particles on electromagnetic waves, improves the measurement accuracy of radar level gauges, and achieves purified emission of flue gas, meeting environmental protection standards.
Smart Images
Figure CN224676954U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of liquid level measurement technology, specifically to a storage tank device for measuring fuming sulfuric acid. Background Technology
[0002] Fuming sulfuric acid is a core derivative of the sulfuric acid industry. Its value stems from its highly reactive SO3 component. It is a sulfuric acid solution containing excess sulfur trioxide (SO3), exhibiting strong corrosiveness, hygroscopicity, and oxidizing properties. It also possesses thermal expansion and volatility. When exposed to air, the volatilized SO3 gas reacts with water vapor in the air to form white sulfuric acid fumes. Current technology typically monitors the level of fuming sulfuric acid in storage tanks by installing radar level gauges on the top of the tank. Furthermore, to guide the fumes generated by the fuming sulfuric acid in the tank to be discharged centrally from the top, current technology usually installs vents on the top of the tank.
[0003] However, when the level of fuming sulfuric acid in the storage tank is low and there is ample remaining space, free SO3 in the fuming sulfuric acid continues to volatilize. A larger gas phase space means more room for SO3 to diffuse, but it also leads to a more "uniform" distribution of SO3 in the gas phase and a gradual increase in concentration. When the SO3 concentration reaches a certain threshold, even without external moisture entering, due to the inherent properties of sulfuric acid solutions, the fuming sulfuric acid itself will volatilize trace amounts of moisture, or trace amounts of moisture adhering to the inner wall of the storage tank. These will react rapidly with the high concentration of SO3, generating sulfuric acid that is suspended in the gas phase space as tiny droplets, forming white fumes. The larger the gas phase space, the greater the total amount of SO3 accumulated, and the greater the amount of acid mist generated, ultimately forming visible white fumes within the storage tank.
[0004] When the sulfuric acid level in the storage tank is high and the remaining space is small, there is almost no space for SO3 to diffuse and buffer after volatilization, resulting in a high-concentration SO3 gas layer above the liquid surface. Even if there is very little water vapor in the tank, the high-concentration SO3 will react violently to generate sulfuric acid mist. Due to the narrow space, the generated acid mist cannot diffuse and dilute, forming dense white smoke in some areas, and even adhering to the liquid surface. In addition, when the storage tank space is small, feeding, discharging, or external vibrations will cause the liquid to shake violently, instantly increasing the contact area between the liquid surface and the gas phase space, and a large amount of free SO3 is stirred up and escaped. This SO3 rapidly accumulates in the narrow gas phase space and reacts with the trace water vapor evaporated from the liquid surface (or residual water vapor on the inner wall of the storage tank), instantly generating a large number of sulfuric acid droplets, forming an explosive fumes. In this case, the fumes in the storage tank will continue to churn due to the liquid movement, and may even fill the entire gas phase space. Moreover, when a large amount of SO3 volatilizes in a short period of time, the emission rate of the exhaust port may not be able to keep up with its generation rate, causing the SO3 concentration in the storage tank to temporarily exceed the standard. The acid mist generated by the reaction of high concentration SO3 with water vapor in the storage tank will remain in the storage tank because it cannot be discharged in time with the exhaust gas, forming visible white smoke.
[0005] The core principle of a radar level gauge is as follows: the transmitter emits high-frequency electromagnetic waves, which are reflected after reaching the liquid surface. The receiver determines the liquid level by calculating the time difference (or frequency difference) between transmission and reception. However, particles in the white smoke scatter and absorb the radar electromagnetic waves, causing them to lose a significant amount of energy before reaching the liquid surface, resulting in a substantial reduction in the signal strength reflected back to the antenna. Furthermore, particles in the smoke can cause non-target reflections of the electromagnetic waves (i.e., reflections from the liquid surface), thus interfering with the radar level gauge's detection results.
[0006] Therefore, there is an urgent need to design a storage tank device for metering fuming sulfuric acid, which has a tail gas absorption device that can absorb the white sulfuric acid fumes carrying SO3 in the gas phase space, making the measurement results of the radar level gauge more accurate. Utility Model Content
[0007] The present invention aims to provide a storage tank device for measuring fuming sulfuric acid, so as to solve the technical problem of inaccurate measurement results of radar level gauges in the prior art.
[0008] To achieve the above objectives, the present invention adopts the following technical solution: A storage tank device for metering fuming sulfuric acid includes a first storage tank for loading fuming sulfuric acid, characterized in that: a tail gas absorber is connected above the first storage tank, the first storage tank and the tail gas absorber are connected by a first connecting pipe, and a first suction pump is installed on the first connecting pipe; the tail gas absorber includes a shell, the interior of which forms a tail gas absorption chamber for purifying the fuming gas, an air inlet is provided at the bottom of the shell and is connected to the first connecting pipe, and an exhaust port is provided at the top of the shell for discharging the purified fuming gas; a radar level gauge assembly for detecting the level of fuming sulfuric acid is installed on the top of the first storage tank.
[0009] Fuming sulfuric acid is stored in the first storage tank, and the radar level gauge group on the top of the first storage tank can continuously detect the level of fuming sulfuric acid. The SO3 gas volatilized from the fuming sulfuric acid in the first storage tank reacts with trace amounts of water vapor to form white smoke. The white smoke flows sequentially through the first connecting pipe, the first suction pump, and the air inlet at the bottom of the shell, and finally enters the tail gas absorption chamber. The SO3-containing smoke is purified in the tail gas absorption chamber, and the purified smoke is discharged from the exhaust port on the top of the shell.
[0010] The exhaust gas absorber actively draws SO3-containing flue gas from the gas phase space of the first storage tank using a first suction pump, blocking the accumulation path of acid mist within the tank. When electromagnetic waves emitted by the radar level gauge penetrate the gas phase space, it reduces the impact of flue gas particles on the scattering / absorption of these waves, restoring the reflected signal intensity to normal levels and thus improving the accuracy of the radar level gauge's detection results. This invention can absorb SO3-laden sulfuric acid white flue gas from the gas phase space, making the radar level gauge's measurement results more accurate. Simultaneously, the exhaust gas absorption chamber purifies the SO3-laden sulfuric acid white flue gas, ensuring that the flue gas discharged through the exhaust port at the top of the casing meets emission standards, complying with environmental protection principles.
[0011] According to the storage tank device for metering fuming sulfuric acid as described in 1), wherein: a first partition and a second partition are arranged from bottom to top inside the shell, and a plurality of air passage holes are evenly opened on the first partition and the second partition; the first partition and the second partition divide the tail gas absorption chamber from bottom to top into a first chamber for receiving sulfuric acid solution, a second chamber for dispersing sulfuric acid solution and fumes, and a third chamber for allowing sulfuric acid solution to enter; the first chamber is connected to a second storage tank for loading 98% concentrated sulfuric acid through a second connecting pipe; the third chamber is connected to the second storage tank for loading 98% concentrated sulfuric acid through a third connecting pipe; and a second suction pump is installed on the third connecting pipe.
[0012] The second suction pump pumps 98% concentrated sulfuric acid from the second storage tank into the third chamber. The concentrated sulfuric acid falls into the second chamber through the air passage of the second partition and is dispersed in the second chamber. SO3-containing flue gas actively drawn in by the first suction pump rises from the first chamber and is dispersed in the second chamber. The sulfuric acid dispersed in the second chamber is absorbed by the flue gas dispersed in the second chamber. The absorbed concentrated sulfuric acid falls and accumulates in the first chamber under its own gravity, and finally flows back to the second storage tank through the second connecting pipe.
[0013] The second chamber disperses the sulfuric acid and flue gas, allowing the SO3-containing flue gas to be absorbed evenly by the sulfuric acid, thus improving the SO3 absorption rate. Simultaneously, the 98% concentrated sulfuric acid serves both as an absorbent and is converted into value-added products, which is beneficial for resource recycling.
[0014] According to the storage tank device for metering fuming sulfuric acid as described in 2), the second chamber is filled with a plurality of ceramic balls.
[0015] Concentrated sulfuric acid is sprayed onto the surface of the ceramic spheres, forming a liquid film. The SO3-containing flue gas rises in a tortuous path between the ceramic spheres and is dispersed, allowing for thorough contact and reaction with the liquid film on the sphere surface. The high specific surface area of the ceramic spheres provides a large gas-liquid reaction interface, and the tortuous path of the SO3-containing flue gas prolongs its residence time in the second chamber, resulting in more complete absorption of the SO3-containing flue gas by the concentrated sulfuric acid.
[0016] According to the storage tank device for metering fuming sulfuric acid as described in 1), wherein: the radar level gauge group includes two radar level gauges, and the two radar level gauges are symmetrically arranged with the center point of the top surface of the first storage tank as the center of symmetry.
[0017] Dual radar level gauges simultaneously emit high-frequency electromagnetic waves to detect the level of fuming sulfuric acid. Operators use the measured values from both gauges, along with previous level monitoring records from when loading fuming sulfuric acid, to assess the accuracy. If the measured value from either gauge deviates significantly from previous records, the operator can determine that the readings may be affected by momentary fog interference, leading to inaccurate readings. In this case, the power of the first suction pump can be increased to absorb the fumes in the first tank, thus restoring the radar level gauge readings to normal. Symmetrically positioned with the center point of the first tank's top surface as the center of symmetry provides a wider detection range compared to a single gauge, allowing for faster absorption of fumes and quicker elimination of interference. Furthermore, the two symmetrically positioned radar level gauges provide redundancy: if one fails, the other continues operating, ensuring uninterrupted level monitoring.
[0018] Fuming sulfuric acid is stored in the first storage tank, and the radar level gauge group on the top of the first storage tank can continuously detect the level of fuming sulfuric acid. The SO3 gas volatilized from the fuming sulfuric acid in the first storage tank reacts with trace amounts of water vapor to form white smoke. The white smoke flows sequentially through the first connecting pipe, the first suction pump, and the air inlet at the bottom of the shell, and finally enters the tail gas absorption chamber. The SO3-containing smoke is purified in the tail gas absorption chamber, and the purified smoke is discharged from the exhaust port on the top of the shell.
[0019] The exhaust gas absorber actively draws SO3-containing flue gas from the gas phase space of the first storage tank using a first suction pump, blocking the accumulation path of acid mist within the tank. When electromagnetic waves emitted by the radar level gauge penetrate the gas phase space, it reduces the impact of flue gas particles on the scattering / absorption of these waves, restoring the reflected signal intensity to normal levels and thus improving the accuracy of the radar level gauge's detection results. This invention can absorb SO3-laden sulfuric acid white flue gas from the gas phase space, making the radar level gauge's measurement results more accurate. Simultaneously, the exhaust gas absorption chamber purifies the SO3-laden sulfuric acid white flue gas, ensuring that the flue gas discharged through the exhaust port at the top of the casing meets emission standards, complying with environmental protection principles. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of the storage tank device for metering fuming sulfuric acid according to this utility model. Figure 2This is a top view of the tail gas absorber in the storage tank device for metering fuming sulfuric acid according to this utility model; Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure of AA.
[0021] In the diagram: 1. First storage tank; 2. Exhaust gas absorber; 21. Shell; 22. Air inlet; 23. Exhaust outlet; 24. First baffle; 25. Second baffle; 26. First chamber; 27. Second chamber; 28. Third chamber; 29. Ceramic ball; 3. Second storage tank; 4. First connecting pipe; 5. Second connecting pipe; 6. Third connecting pipe; 7. Radar level gauge. Detailed Implementation
[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0025] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0026] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.
[0027] Please see Figures 1-3 This utility model relates to a storage tank device for metering fuming sulfuric acid. It includes a first storage tank 1 for loading fuming sulfuric acid, a tail gas absorber 2 connected above the first storage tank 1, and the first storage tank 1 and tail gas absorber 2 connected by a first connecting pipe 4. A first suction pump is installed on the first connecting pipe 4. The tail gas absorber 2 includes a housing 21, with a tail gas absorption chamber formed inside the housing 21 for purifying the fuming gas. An air inlet 22 is provided at the bottom of the housing 21, communicating with the first connecting pipe 4. An exhaust port 23 is provided at the top of the housing 21 for discharging the purified fuming gas. A radar level gauge assembly for detecting the level of fuming sulfuric acid is installed on the top of the first storage tank 1. In this embodiment, there are multiple exhaust ports 23, evenly spaced to allow for rapid gas discharge.
[0028] Fuming sulfuric acid is stored in the first storage tank 1. The radar level gauges 7 on the top of the first storage tank 1 can continuously monitor the level of the fuming sulfuric acid. The SO3 gas volatilized from the fuming sulfuric acid in the first storage tank 1 reacts with trace amounts of water vapor to form white smoke. The white smoke flows sequentially through the first connecting pipe 4, the first suction pump, and the air inlet 22 at the bottom of the shell, and finally enters the tail gas absorption chamber. The SO3-containing smoke is purified in the tail gas absorption chamber, and the purified smoke is discharged from the exhaust port 23 at the top of the shell 21.
[0029] The exhaust gas absorber 2 actively draws SO3-containing flue gas from the gas phase space of the first storage tank 1 using a first suction pump, blocking the accumulation path of acid mist within the tank. When the electromagnetic waves emitted by the radar level gauge 7 penetrate the gas phase space, it reduces the impact of flue gas particles on the scattering / absorption of the electromagnetic waves, restoring the reflected signal intensity to normal levels, thus making the detection results of the radar level gauge group more accurate. This invention can absorb SO3-containing sulfuric acid white flue gas in the gas phase space, making the measurement results of the radar level gauge 7 more accurate. Simultaneously, the exhaust gas absorption chamber purifies the SO3-containing sulfuric acid white flue gas, ensuring that the flue gas finally discharged through the exhaust port 23 at the top of the casing meets emission standards, complying with environmental protection principles.
[0030] In this embodiment: A first partition 24 and a second partition 25 are arranged from bottom to top inside the shell 21. Both the first partition 24 and the second partition 25 have a plurality of evenly spaced air passages. The first partition 24 and the second partition 25 divide the exhaust gas absorption chamber from bottom to top into a first chamber 26 for receiving sulfuric acid solution, a second chamber 27 for dispersing sulfuric acid solution and flue gas, and a third chamber 28 for allowing sulfuric acid solution to enter. The first chamber 26 is connected to a second storage tank 3 for loading 98% concentrated sulfuric acid via a second connecting pipe 5. In this embodiment, the end of the second connecting pipe 5 connected to the first storage tank 1 is higher than the end connected to the second storage tank 3. The third chamber 28 is connected to the second storage tank 3 for loading 98% concentrated sulfuric acid via a third connecting pipe 6, on which a second suction pump is installed. In this embodiment, both the first partition 24 and the second partition 25 are made of 316 stainless steel, which is resistant to strong acids and can withstand acid erosion. Furthermore, 316 stainless steel has high tensile strength, high elongation, and excellent toughness, enabling it to withstand the gas pressure of the exhaust gas absorber 2 and resist deformation or breakage caused by long-term acid erosion. Additionally, the first connecting pipe 4, the second connecting pipe 5, and the third connecting pipe 6 in this embodiment are all lined with PTFE steel pipes, which have excellent temperature and corrosion resistance, making them suitable for transporting highly corrosive gases and liquids at high temperatures.
[0031] The second suction pump pumps 98% concentrated sulfuric acid from the second storage tank 3 into the third chamber 28. The concentrated sulfuric acid falls through the air passage of the second partition 25 into the second chamber 27, where it is dispersed. SO3-containing flue gas actively drawn in by the first suction pump rises from the first chamber 26 and is dispersed in the second chamber 27. The sulfuric acid dispersed in the second chamber 27 is absorbed by the dispersed flue gas. The absorbed concentrated sulfuric acid falls and accumulates in the first chamber 26 under its own gravity, and finally flows back to the second storage tank 3 through the second connecting pipe 5. The second chamber 27 disperses the sulfuric acid and flue gas, allowing the SO3-containing flue gas to be uniformly absorbed by the sulfuric acid, thus improving the SO3 absorption rate. Simultaneously, the 98% concentrated sulfuric acid acts as both an absorbent and is converted into a value-added product, which is beneficial for resource recycling.
[0032] In this embodiment, the second chamber 27 is filled with a number of ceramic balls 29.
[0033] Concentrated sulfuric acid is sprayed onto the surface of ceramic spheres 29, forming a liquid film. The SO3-containing flue gas rises in a tortuous path between the ceramic spheres 29 and is dispersed, allowing for sufficient contact and reaction with the liquid film on the surface of the ceramic spheres 29. The high specific surface area of the ceramic spheres 29 provides a large gas-liquid reaction interface, and the tortuous path of the SO3-containing flue gas prolongs its residence time in the second chamber 27, resulting in more thorough absorption of the SO3-containing flue gas by the concentrated sulfuric acid.
[0034] In this embodiment, the radar level gauge group 7 includes two radar level gauges 7, which are symmetrically arranged with the center point of the top surface of the first storage tank 1 as the center of symmetry. In this embodiment, the radar level gauges 7 are installed on the top of the first storage tank 1 by bolts and nuts. Moreover, the radar level gauges 7 in this embodiment are horn-type radar level gauges 7. The horn structure can highly focus electromagnetic waves and reduce false reflections to the inner wall of the first storage tank 1.
[0035] Dual radar level gauges 7 synchronously emit high-frequency electromagnetic waves, enabling simultaneous detection of the fuming sulfuric acid level. Operators can assess the readings of both gauges based on the actual values measured by both gauges 7, along with previous level monitoring records during the loading of fuming sulfuric acid. If the measured value of either gauge 7 deviates significantly from previous records, the operator can determine that the gauges may be affected by momentary fog interference, leading to inaccurate readings. In this case, the power of the first suction pump can be increased to absorb the fumes in the first storage tank 1, thus restoring the normal readings of the radar level gauges 7. Symmetrically positioned with the center point of the top surface of the first storage tank 1 as the center of symmetry, two radar level gauges 7 provide a wider detection range compared to a single gauge 7, allowing for faster absorption of fumes and quickly eliminating interference from the fumes. In addition, the two symmetrically arranged radar level gauges 7 can form a redundant backup: if one fails, the other can continue to work, ensuring that level monitoring is uninterrupted.
[0036] The above are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.
Claims
1. A storage tank apparatus for metering fuming sulfuric acid, comprising a first storage tank for loading fuming sulfuric acid, characterized in that: A tail gas absorber is connected to the top of the first storage tank. The first storage tank and the tail gas absorber are connected by a first connecting pipe, and a first suction pump is installed on the first connecting pipe. The tail gas absorber includes a shell, and a tail gas absorption chamber for purifying flue gas is formed inside the shell. An air inlet is opened at the bottom of the shell, and the air inlet is connected to the first connecting pipe. An exhaust port for purifying flue gas is opened at the top of the shell. A radar level gauge group for detecting the level of fuming sulfuric acid is installed on the top of the first storage tank.
2. The storage tank device for metering fuming sulfuric acid according to claim 1, characterized in that: The shell is provided with a first partition and a second partition from bottom to top. Both the first partition and the second partition are evenly provided with a plurality of air passage holes. The first partition and the second partition divide the exhaust gas absorption chamber from bottom to top into a first chamber for receiving sulfuric acid solution, a second chamber for dispersing sulfuric acid solution and flue gas, and a third chamber for allowing sulfuric acid solution to enter. The first chamber is connected to a second storage tank for loading 98% concentrated sulfuric acid through a second connecting pipe. The third chamber is connected to the second storage tank for loading 98% concentrated sulfuric acid through a third connecting pipe. A second suction pump is installed on the third connecting pipe.
3. The storage tank device for metering fuming sulfuric acid according to claim 2, characterized in that: The second chamber is filled with several ceramic balls.
4. The storage tank device for metering fuming sulfuric acid according to claim 1, characterized in that: The radar level gauge group includes two radar level gauges, which are symmetrically arranged with the center point of the top surface of the first storage tank as the center of symmetry.