A gas holdup measuring mechanism for a gas-liquid mixed agitator

Abstract

The application discloses a gas content measuring mechanism for a gas-liquid mixing stirrer, which comprises a cover plate arranged horizontally in a cylinder body, wherein the middle part of the cover plate is provided with a through hole, the cover body is sleeved on a stirring shaft through the through hole, the cover plate can be adjusted in the length direction of the stirring shaft and is fixed relative to the cylinder body, and a gap is formed between the cover plate and the inner side wall of the cylinder body, so that the cover plate can prevent the liquid surface of the cylinder body from forming a conical rotary area when the stirring assembly is working; and a liquid level reading plate is fixed with the cover plate, and the part of the liquid level reading plate above the cover plate is provided with scale lines. The cover plate can cover the liquid, the "conical rotary area" is prevented from being formed or the size of the "conical rotary area" is effectively reduced in a physical isolation manner, the data read through the scale lines is more accurate, and the gas content measuring operation is facilitated to be more accurate.

Description

Technical Field

[0001] This utility model relates to the field of gas-liquid mixing stirrers, and specifically to a gas content measuring mechanism for gas-liquid mixing stirrers. Background Technology

[0002] In the chemical industry, agitators play a wide range of roles. When agitators are used as reactors for gas-liquid reactions, the gas content of the liquid inside the agitator can be further increased by replacing traditional impellers with self-priming agitators, and the gas-liquid reaction can take place at the gas-liquid interface.

[0003] To increase the reaction rate of gas-liquid reactions, the gas content of the liquid in the stirrer can be increased to increase the gas-liquid interface area, thereby improving the reaction rate.

[0004] The self-priming gas-liquid mixing impeller utilizes the negative pressure generated by the impeller's high-speed rotation in a liquid to draw air or other gases from the hollow shaft driving the impeller or the sleeve outside the shaft to the impeller. The impeller then disperses the gas into the liquid in the form of microbubbles. It can be used in gas-liquid chemical reactions to improve mass transfer efficiency and simplify equipment structure. It can also be used in phase separation applications such as liquid-liquid separation and liquid-solid separation, for example, to remove solids, oil, and fiber pollutants from wastewater. Pollutants adhere to the microbubbles and rise to the water surface with them, achieving pollutant separation and water purification. Because the gas-liquid mixing impeller simultaneously performs air intake and gas-liquid mixing functions, it simplifies equipment structure and eliminates various auxiliary devices found in traditional equipment, offering significant economic and technical advantages. It can be widely used in water treatment, waste gas treatment, chemical, metallurgical, and papermaking fields, forming various specialized equipment such as wastewater biochemical treatment equipment, flotation machines, waste gas purification equipment, and gas-liquid reaction equipment in chemical, pharmaceutical, metallurgical, food, and papermaking industries.

[0005] When designing a self-priming agitator, the gas holdup in the liquid within the reactor is a crucial indicator for evaluating the agitator's reaction rate. One readily apparent method is to calculate the overall gas holdup during self-priming operation by determining the rise in liquid level within the agitator. However, due to the lack of strong reflectivity of air bubbles, radar level gauges cannot accurately measure changes in liquid level. Since the density of air bubbles relative to liquid is negligible, traditional differential pressure level gauges also fail, failing to accurately reflect the liquid level height within the gas-liquid mixing agitator when a large number of air bubbles are present. Especially during agitator operation, severe disturbances and significant liquid level fluctuations, coupled with the presence of a central "conical rotation zone" near the agitator shaft, make it difficult to accurately measure the effective liquid level rise. Utility Model Content

[0006] To address the aforementioned problems, this invention proposes a gas content measurement mechanism for a gas-liquid mixing agitator.

[0007] The technical solution adopted by this utility model is as follows:

[0008] A gas holdup measuring mechanism for a gas-liquid mixing agitator, the gas-liquid mixing agitator comprising a cylinder, a stirring assembly disposed within the cylinder, and a gas distribution structure disposed within the stirring assembly or the cylinder, the stirring assembly comprising a stirring shaft and stirring blades fixed to the lower part of the stirring shaft; the gas holdup measuring mechanism comprising: A cover plate is located inside the cylinder and is horizontally arranged. The cover plate has a through hole in the middle. The cover body is sleeved on the stirring shaft through the through hole. The cover plate can be adjusted in position along the length of the stirring shaft and fixed relative to the cylinder. There is a gap between the cover plate and the inner wall of the cylinder. The cover plate is used to prevent the liquid surface of the cylinder from forming a conical rotating zone when the stirring assembly is working. A liquid level reading plate is fixed to the cover plate, and the portion of the liquid level reading plate above the cover plate has scale lines.

[0009] When the stirring component is working, it generally rotates at a high speed, which can easily create a "conical rotation zone". This application can cover the liquid by setting a cover plate, which can prevent the formation of a "conical rotation zone" or effectively reduce the size of the "conical rotation zone" through physical isolation. This makes the data read by the scale line more accurate and facilitates more accurate gas content measurement.

[0010] In practical applications, one measurement method can be: Fill the cylinder with liquid to a level H1. Since the cylinder dimensions are fixed, the liquid volume V1 inside the cylinder can be obtained using the H1 technique. Insert the cover plate into the agitator and adjust its position so that the bottom surface of the cover plate is slightly in contact with the liquid. After adjusting it to the correct position, make the cover plate face the cylinder. When the gas-liquid mixing agitator is working, the gas from the gas distribution structure enters the liquid. Due to the rotation of the agitator components, the gas is evenly dispersed into the liquid, forming a gas-liquid mixture. As the gas content in the gas-liquid mixture increases, the overall volume of the gas-liquid mixture increases, and the liquid level rises. Because of the presence of the cover plate, the rising liquid can only pass through the gaps around the cover plate. The central vortex zone (i.e., the conical rotating zone) cannot be formed because of the presence of the cover plate. Therefore, although there is violent flow of the gas-liquid mixture below the cover plate, a stable, undulating liquid surface can be formed above the cover plate through the physical isolation of the cover plate. The liquid level rise height, H2, can be read from the scale on the liquid level reading plate. The cross-sectional area of ​​the cylinder is equal to the gas volume V2 in the gas-liquid mixture (i.e., the increased volume is the gas volume).

[0011] Gas volume V2 / Total volume of gas-liquid mixture (V1 + V2) = Gas holdup of gas-liquid mixing agitator.

[0012] In practical applications, the cover plate of this application can be fixed to the cylinder in various existing methods.

[0013] The cover plate of this application is adapted to the shape of the inner wall of the cylinder. For example, when the cylinder is cylindrical, the cover plate is also a circular cover plate.

[0014] In one embodiment of this utility model, the thickness of the cover plate is 1mm to 10mm, preferably 1mm to 3mm.

[0015] In one embodiment of the present invention, the distance between the edge of the cover plate and the inner wall of the cylinder is 3mm to 10mm, preferably 3mm to 5mm; the through hole is coaxial with the stirring shaft, and the gap between the through hole and the stirring shaft is 3mm to 10mm, preferably 3mm to 5mm.

[0016] In one embodiment of the present invention, a vertically arranged baffle is fixed to the inner side wall of the cylinder, and the baffle has a plurality of spaced first fixing holes; A connecting plate is fixed to the cover plate, and the connecting plate has a plurality of spaced-apart second fixing holes; The connecting plate cooperates with the baffle and is fixed by fasteners passing through the corresponding second fixing holes and the first fixing holes.

[0017] In addition to fixing the cover plate (which works with the connecting plate and is fixed by fasteners), the baffle of this application can also eliminate the "conical gyratory zone" in the center of the tank during turbulent flow.

[0018] In one embodiment of the present invention, the edge of the cover plate has a clearance notch for the baffle to pass through.

[0019] In one embodiment of this utility model, there are multiple baffles evenly distributed around the axis of the cylinder, and multiple connecting plates evenly distributed around the axis of the cylinder, with the baffles and connecting plates corresponding to each other.

[0020] In one embodiment of the present invention, at least one connecting plate serves as the liquid level reading plate.

[0021] In one embodiment of this utility model, the gas distribution structure includes: The gas delivery channel is located on the stirring shaft; A gas delivery pipe is fixed on the stirring blade, and one end of the gas delivery pipe is connected to the gas delivery channel.

[0022] That is, the stirring component of this application is a self-priming gas-liquid mixing impeller.

[0023] In one embodiment of this utility model, the gas distribution structure is an aeration pipe for inputting gas into the cylinder.

[0024] In one embodiment of the present invention, a telescopic element is further included, wherein the piston rod of the telescopic element is fixed to the cover plate; A trigger sensor for detecting liquid is fixed on the lower surface of the cover plate; The telescopic element is used to move the cover plate downwards until the sensor detects liquid.

[0025] In practical applications, the telescopic element can be an electric push rod. A trigger sensor that detects the liquid can be linked with the telescopic element to quickly and accurately adjust the cover to the appropriate position (the lower end of the cover just contacts the liquid inside the cylinder).

[0026] The beneficial effects of this utility model are: by setting a cover plate, this application can cover the liquid, and prevent the formation of a "conical rotation zone" or effectively reduce the size of the formed "conical rotation zone" through physical isolation. In this way, the data read by the scale line is more accurate, and it is convenient to carry out more accurate gas content measurement operations. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the gas holdup measuring mechanism used in the gas-liquid mixing stirrer in Example 1; Figure 2 This is a top view of the gas holdup measuring mechanism used in a gas-liquid mixing agitator; Figure 3 yes Figure 2 Sectional view of AA; Figure 4 This is an exploded view of the gas holdup measuring mechanism used in gas-liquid mixing agitators; Figure 5 This is a schematic diagram when the initial liquid level in the cylinder is T1; Figure 6 This is a schematic diagram showing the rise in H2 liquid level inside the working cylinder of the stirring assembly and gas distribution structure. Figure 7 This is a schematic diagram of the gas holdup measuring mechanism for a gas-liquid mixing stirrer used in Example 2.

[0028] The labels for the attached figures are as follows: 1. Cylinder body; 11. Baffle; 111. First fixing hole; 2. Stirring assembly; 21. Stirring shaft; 22. Stirring blades; 3. Gas distribution structure; 31. Gas delivery channel; 32. Gas delivery pipeline; 4. Cover plate; 41. Through hole; 42. Connecting plate; 421. Second fixing hole; 42a. Liquid level reading plate; 42b. Scale line; 43. Clearance notch; 5. Fastener; 6. Telescopic element; 61. Piston rod; 7. Trigger sensor. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] In the description of this application, it should be noted that the terms "inner" and "outer," 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 product is in use. They are used only for the convenience of describing this application and for 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 application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0031] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] The present invention will now be described in detail with reference to the accompanying drawings.

[0033] Example 1 like Figures 1-4 As shown, a gas holdup measuring mechanism for a gas-liquid mixing agitator is disclosed. The gas-liquid mixing agitator includes a cylinder 1, a stirring assembly 2 disposed within the cylinder 1, and a gas distribution structure 3 disposed within the stirring assembly 2 or the cylinder 1. The stirring assembly 2 includes a stirring shaft 21 and stirring blades 22 fixed to the lower part of the stirring shaft 21. The gas holdup measuring mechanism includes: The cover plate 4 is located inside the cylinder 1 and is horizontally arranged. The cover plate 4 has a through hole 41 in the middle. The cover is sleeved on the stirring shaft 21 through the through hole 41. The cover plate 4 can be adjusted in position along the length of the stirring shaft 21 and fixed relative to the cylinder 1. There is a gap between the cover plate 4 and the inner wall of the cylinder 1. The cover plate 4 is used to prevent the liquid surface of the cylinder 1 from forming a conical rotating area when the stirring assembly 2 is working. The liquid level reading plate 42a is fixed to the cover plate 4, and the portion of the liquid level reading plate 42a located above the cover plate 4 has scale lines 42b.

[0034] When the stirring component 2 is working, it generally rotates at a high speed, which can easily generate a "conical rotation zone". This application can cover the liquid by setting a cover plate 4, which can prevent the formation of a "conical rotation zone" or effectively reduce the size of the formed "conical rotation zone" through physical isolation. This makes the data read by the scale line 42b more accurate and facilitates more accurate gas content measurement.

[0035] In practical applications, one measurement method can be: See Figure 5 Fill the cylinder 1 with liquid to a level H1. Since the dimensions of cylinder 1 are fixed, the volume V1 of the liquid inside cylinder 1 can be calculated based on H1. Place the cover plate 4 into the stirrer and adjust the position of the cover plate 4 until the bottom surface of the cover plate 4 is slightly in contact with the liquid. After adjusting it into place, make the cover plate 4 face the cylinder 1. When the gas-liquid mixing agitator is working, the gas from the gas distribution structure 3 enters the liquid. Due to the rotation of the stirring component 2, the gas is evenly dispersed into the liquid, forming a gas-liquid mixture. As the gas content in the gas-liquid mixture increases, the overall volume of the gas-liquid mixture increases, and the liquid level rises. Due to the presence of the cover plate 4, the rising liquid can only pass through the gaps around the cover plate 4. The central vortex zone (i.e., the conical rotating zone) cannot be formed due to the presence of the cover plate 4. Therefore, although there is violent flow in the gas-liquid mixture below the cover plate 4, a stable, undulating liquid surface can be formed above the cover plate 4 through the physical isolation of the cover plate 4. See Figure 6 The liquid level rise height H2 can be read from the scale line 42b on the liquid level reading plate 42a. The cross-sectional area of ​​cylinder 1 is equal to the gas volume V2 in the gas-liquid mixture (i.e., the increased volume is the gas volume).

[0036] Gas volume V2 / Total volume of gas-liquid mixture (V1 + V2) = Gas holdup of gas-liquid mixing agitator.

[0037] The cover plate 4 of this application is adapted to the shape of the inner wall of the cylinder 1. For example, when the cylinder 1 is a cylindrical cylinder 1, the cover plate 4 is also a circular cover plate 4.

[0038] In practical applications, the thickness of the cover plate 4 is 1mm to 10mm, preferably 1mm to 3mm.

[0039] In practical applications, the distance between the edge of the cover plate 4 and the inner wall of the cylinder 1 is 3mm to 10mm, preferably 3mm to 5mm; the through hole 41 is coaxially arranged with the stirring shaft 21, and the gap between the through hole 41 and the stirring shaft 21 is 3mm to 10mm, preferably 3mm to 5mm.

[0040] In practical applications, the cover plate 4 of this application can be fixed to the cylinder 1 using various existing methods. For example... Figure 1 , 3 As shown in Figure 4, in this embodiment, a vertically arranged baffle 11 is fixed on the inner wall of the cylinder 1, and the baffle 11 has a plurality of spaced first fixing holes 111. A connecting plate 42 is fixed on the cover plate 4, and the connecting plate 42 has a plurality of spaced second fixing holes 421; The connecting plate 42 cooperates with the baffle 11 and is fixed by fasteners 5 passing through the corresponding second fixing hole 421 and first fixing hole 111.

[0041] In addition to fixing the cover plate 4 (which cooperates with the connecting plate 42 and is fixed by fasteners 5), the baffle 11 of this application can also eliminate the "conical gyratory zone" in the center of the tank in turbulent conditions.

[0042] like Figure 4 As shown, in this embodiment, the edge of the cover plate 4 has a clearance notch 43 for the baffle 11 to pass through.

[0043] In this embodiment, there are multiple baffles 11, which are evenly distributed around the axis of the cylinder 1, and multiple connecting plates 42, which are evenly distributed around the axis of the cylinder 1. The baffles 11 and the connecting plates 42 are matched one-to-one.

[0044] like Figure 1 As shown, in this embodiment, at least one connecting plate 42 serves as a liquid level reading plate 42a.

[0045] like Figure 3 and 4 As shown, in this embodiment, the gas distribution structure 3 includes: Gas delivery channel 31 is provided on stirring shaft 21; Gas delivery pipe 32 is fixed on stirring blade 22, and one end of gas delivery pipe 32 is connected to gas delivery channel 31.

[0046] That is, the stirring component 2 of this application is a self-priming gas-liquid mixing impeller.

[0047] In other embodiments, the gas distribution structure 3 is an aeration pipe for inputting gas into the cylinder 1.

[0048] The following is a set of data obtained from actual testing: The cylinder has a diameter of 1 meter and a height of 1.5 meters, with an elliptical end cap at the bottom. Water was placed inside the cylinder to test the gas intake capacity of the stirring assembly (self-priming stirring paddle).

[0049] 1. Initial state: The cylinder is filled with water, and the liquid level reaches 1m above the cylinder height. At this time, the liquid holding capacity in the cylinder is: (capacity of the head) 0.1191m³ + π 0.5² 1m (cylinder volume) = 0.7854. The total liquid holding capacity is 0.9045m³.

[0050] The thickness of the cover plate is 0.005m. At this point, the bottom of the cover plate is in contact with the water surface, which is the initial cover plate height H1.

[0051] 2. Equipment Start-up: The stirring shaft rotates in a circular motion. When the stirring shaft rotates at high speed, a negative pressure zone is formed in the stirring blades, thereby drawing gas sequentially from the gas delivery channel and gas delivery pipe into the liquid, that is, discharging it from the stirring blades into the liquid. Through stirring, the gas is dispersed into the liquid phase, forming a gas-liquid mixture. Due to the presence of the cover plate and baffles, the central vortex zone and liquid surface fluctuations are counteracted.

[0052] 3. As the gas content in the liquid increases, the liquid level also rises. The rising liquid level gradually increases through the gaps between the cover plate and the cylinder. The height of the liquid level rise, H2 = 0.05m, can be read through the scale.

[0053] 0.05m 0.5² π = 0.0393 m³.

[0054] 0.0393m³ / (0.9045m³+0.0393m³)≈4.2%.

[0055] The final gas holdup was approximately 4.2%.

[0056] Example 2 like Figure 7 As shown, the difference between this embodiment and Embodiment 1 lies in the adjustment and fixing structure of the cover plate. In this embodiment, a telescopic element 6 is included, and the piston rod 61 of the telescopic element 6 is fixed to the cover plate 4; A trigger sensor 7 for detecting liquid is fixed on the lower surface of the cover plate 4; The telescopic element 6 is used to move the cover plate 4 downward until the sensor 7 is triggered to detect liquid.

[0057] In practical applications, the telescopic element 6 can be an electric push rod. The trigger sensor 7, which detects the liquid, can be linked with the telescopic element 6 to quickly and accurately adjust the cover plate 4 to the appropriate position (the lower end of the cover plate 4 just contacts the liquid inside the cylinder 1).

[0058] The above description is only a preferred embodiment of the present utility model and does not limit the scope of patent protection of the present utility model. Any equivalent structural transformations made based on the content of the present utility model specification and drawings, whether directly or indirectly applied to other related technical fields, are similarly included within the scope of protection of the present utility model.

Claims

1. A gas holdup measuring mechanism for a gas-liquid mixing agitator, the gas-liquid mixing agitator comprising a cylinder, a stirring assembly disposed within the cylinder, and a gas distribution structure disposed within the stirring assembly or the cylinder, the stirring assembly comprising a stirring shaft and stirring blades fixed to the lower part of the stirring shaft; characterized in that, The gas content measurement apparatus includes: A cover plate is located inside the cylinder and is horizontally arranged. The cover plate has a through hole in the middle. The cover body is sleeved on the stirring shaft through the through hole. The cover plate can be adjusted in position along the length of the stirring shaft and fixed relative to the cylinder. There is a gap between the cover plate and the inner wall of the cylinder. The cover plate is used to prevent the liquid surface of the cylinder from forming a conical rotating zone when the stirring assembly is working. A liquid level reading plate is fixed to the cover plate, and the portion of the liquid level reading plate above the cover plate has scale lines.

2. The gas content measuring mechanism for a gas-liquid mixing stirrer as described in claim 1, characterized in that, The cover plate has a thickness of 1mm to 10mm.

3. The gas content measuring mechanism for a gas-liquid mixing stirrer as described in claim 1, characterized in that, The distance between the edge of the cover plate and the inner wall of the cylinder is 3mm to 10mm; the through hole is coaxial with the stirring shaft, and the gap between the through hole and the stirring shaft is 3mm to 10mm.

4. The gas content measuring mechanism for a gas-liquid mixing stirrer as described in claim 1, characterized in that, The inner wall of the cylinder is fixed with a vertically arranged baffle, and the baffle has a plurality of spaced first fixing holes. A connecting plate is fixed to the cover plate, and the connecting plate has a plurality of spaced-apart second fixing holes; The connecting plate cooperates with the baffle and is fixed by fasteners passing through the corresponding second fixing holes and the first fixing holes.

5. The gas content measuring mechanism for a gas-liquid mixing stirrer as described in claim 4, characterized in that, The edge of the cover plate has a clearance notch for the baffle to pass through.

6. The gas content measuring mechanism for a gas-liquid mixing stirrer as described in claim 4, characterized in that, There are multiple baffles, which are evenly distributed around the axis of the cylinder; there are multiple connecting plates, which are evenly distributed around the axis of the cylinder; the baffles and connecting plates are matched one-to-one.

7. The gas content measuring mechanism for a gas-liquid mixing stirrer as described in claim 4, characterized in that, At least one connecting plate serves as the liquid level reading plate.

8. The gas content measuring mechanism for a gas-liquid mixing stirrer as described in claim 1, characterized in that, The gas distribution structure includes: The gas delivery channel is located on the stirring shaft; A gas delivery pipe is fixed on the stirring blade, and one end of the gas delivery pipe is connected to the gas delivery channel.

9. The gas content measuring mechanism for a gas-liquid mixing stirrer as described in claim 1, characterized in that, The gas distribution structure is an aeration pipe used to input gas into the cylinder.

10. The gas holdup measuring mechanism for a gas-liquid mixing stirrer as described in claim 1, characterized in that, It also includes a telescopic element, the piston rod of which is fixed to the cover plate; A trigger sensor for detecting liquid is fixed on the lower surface of the cover plate; The telescopic element is used to move the cover plate downwards until the sensor detects liquid.

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