Rotational flow defoaming device based on air jet flow

Abstract

The utility model provides a rotational flow defoaming device based on air jet, and particularly relates to the technical field of defoaming of a coal flotation process. The defoaming device comprises a column section body, a cone section body, a liquid storage tank and a jet pipe, the liquid storage tank is positioned at the bottom of the column section body; the conical section body is positioned in an inner cavity of the liquid storage tank; an overflow pipe is arranged at the top of the column section body; a feeding pipe is arranged on the outer side wall of the column section body; an inlet of the jet pipe is communicated with the bottom of the conical section body through an underflow pipe; an outlet of the jet pipe is communicated with an inner cavity of the liquid storage tank; an exhaust pipe and an air inlet pipe are arranged on the outer side wall of the liquid storage tank, and a liquid discharge pipe is arranged at the bottom of the liquid storage tank. The foam removing device is simple and reasonable in structure, strong shearing force, strong pressure gradient and strong impact force are formed by combining the Venturi principle and rotational flow to remove foam, repeated foam removing can be efficiently and rapidly achieved, secondary foam cannot be generated during discharging, and the foam removing effect is better.

Description

Technical Field

[0001] This utility model relates to the field of defoaming technology in coal flotation processes, specifically to a vortex defoaming device based on air jets. Background Technology

[0002] Flotation is currently the most widely used, technologically mature, and effective method for separating fine-grained coal slime, playing a crucial role in coal preparation production. However, due to various factors such as slurry properties, reagent reactions, and process equipment, a large amount of foam is generated during the flotation process. This foam is stable, highly viscous, and difficult to eliminate naturally. As the flotation concentrate flows into the concentrate tank, the continuous accumulation of foam not only reduces the effective volume of the concentrate tank but also easily leads to pump cavitation, affecting subsequent process feeding. In severe cases, foam overflow can occur, impacting production safety.

[0003] Currently, defoaming in flotation processes both domestically and internationally mainly employs three methods: natural defoaming, chemical defoaming, and physical defoaming. However, all of these methods have the following shortcomings: 1. Defoaming using a spray device can eliminate foam in a short time by applying water spray, but the increased water volume raises the concentrate tank level, further increasing the load on subsequent filter presses; 2. Thermal defoaming requires continuous heating of the foam fluid, resulting in excessive energy consumption. Repeated heating can also affect the properties of the foam fluid; 3. Chemical defoamers can achieve rapid defoaming, but their use limits production costs and causes some pollution; 4. Mechanical stirring has a good defoaming effect, but it is prone to secondary foaming during transport. Spray defoaming has a more ideal effect, but it requires a large amount of water.

[0004] Therefore, the difficulty in eliminating foam in clean coal during flotation has become one of the main problems in coal preparation production. There is an urgent need to develop defoaming technologies suitable for on-site use to improve defoaming efficiency and ensure production efficiency and safety. Utility Model Content

[0005] To overcome the shortcomings of the prior art, this utility model provides a swirling defoaming device based on air jet, the specific technical solution of which is as follows:

[0006] A swirling defoaming device based on air jet includes a column section, a conical section, a storage tank, and a jet pipe. The storage tank is located at the bottom of the column section. The conical section is located inside the storage tank, and its top is fixed to the top of the storage tank's inner cavity. The column section, conical section, and storage tank are fixedly connected by a flange. An overflow pipe is provided at the top of the column section. An inlet pipe communicating with the inner cavity of the column section is provided on the outer wall of the column section near its top. The inlet of the jet pipe is connected to the bottom of the conical section through an underflow pipe. The outlet of the jet pipe is connected to the inner cavity of the storage tank. An exhaust pipe communicating with the inner cavity of the storage tank is provided on the outer wall of the storage tank near the connection between the column section and the storage tank. An air inlet pipe communicating with the air inlet of the jet pipe is provided on the outer wall of the storage tank at a position corresponding to the air inlet of the jet pipe. A drain pipe is provided at the bottom of the storage tank.

[0007] Preferably, the diameter of the overflow pipe is 0.35 to 0.4 times the diameter of the column segment; the top of the overflow pipe extends beyond the top of the column segment and is connected to the fan; and the bottom of the overflow pipe extends into the inner cavity of the column segment for a length of 0.75 to 1 times the diameter of the column segment.

[0008] Preferably, the diameter of the feed pipe is 0.3 to 0.35 times the diameter of the column section.

[0009] Preferably, the cone angle of the cone segment is 20° to 40°.

[0010] Preferably, the diameter of the underflow pipe is 0.25 to 0.35 times the diameter of the column section.

[0011] Preferably, the jet tube includes a constriction section, a throat, and a diffuser section.

[0012] Preferably, the diameter of the liquid storage tank is the same as the diameter of the column segment, and the height of the liquid storage tank is 3 to 5 times the diameter of the column segment.

[0013] More preferably, the drain pipe is equipped with an electric drain valve; the inner cavity of the storage tank is equipped with a liquid level sensor, and the liquid level sensor is electrically connected to the electric drain valve.

[0014] Furthermore, preferably, a sealing ring is provided at the connection between the column section, the cone section, the liquid storage tank and the flange.

[0015] More preferably, the conical segment is a frustum structure with openings at the top and bottom.

[0016] The beneficial effects of this utility model are:

[0017] This invention has a simple and reasonable structure, is easy to operate, and combines the Venturi principle with the strong shear force, strong pressure gradient and strong impact force formed by swirling flow to eliminate foam. It can efficiently and quickly achieve multiple defoaming and will not generate secondary foam during discharge. Attached Figure Description

[0018] The accompanying drawings constituting this application are provided to further understand this application and do not constitute an undue limitation of this application.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a cross-sectional view of the jet tube in this utility model;

[0021] In the diagram, 1-feed pipe; 2-overflow pipe; 3-column section; 4-conical section; 5-underflow pipe; 6-jet pipe; 7-exhaust pipe; 8-air inlet pipe; 9-storage tank; 10-drain pipe; 11-electric drain valve; 12-liquid level sensor; 13-flange. Detailed Implementation

[0022] The specific implementation of the swirling defoaming device based on air jet provided by this utility model will be further described with reference to the accompanying drawings and embodiments.

[0023] like Figure 1 As shown, an air jet-based swirling defoaming device includes a column section 3, a conical section 4 with an open top and bottom forming a frustum structure, a jet pipe 6, and a storage tank 9. The storage tank 9 is located at the bottom of the column section 3. The conical section 4 is located in the inner cavity of the storage tank 9 and is fixed to the top of the inner cavity of the storage tank 9. The column section 3, the conical section 4, and the storage tank 9 are fixedly connected by a flange 13. Preferably, in order to ensure the overall sealing of the device, a sealing ring is provided at the connection between the column section 3, the conical section 4, the storage tank 9 and the flange 13.

[0024] Preferably, the top of the column segment 3 is provided with an overflow pipe 2, wherein the diameter of the overflow pipe 2 is 0.35 to 0.4 times the diameter of the column segment 3; and the top of the overflow pipe 2 extends out of the top of the column segment 3 and is connected to the exhaust fan, and the bottom of the overflow pipe 2 extends into the inner cavity of the column segment 3 for a length of 0.75 to 1 times the diameter of the column segment 3.

[0025] Preferably, a feed pipe 1 communicating with the inner cavity of the column segment 3 is provided on the outer side wall near its top end, and the diameter of the feed pipe 1 is 0.3 to 0.35 times the diameter of the column segment 3;

[0026] Preferably, the inlet of the jet pipe 6 is connected to the bottom of the conical section 4 through the underflow pipe 5, wherein the diameter of the underflow pipe 5 is 0.25 to 0.35 times the diameter of the column section 3; the outlet of the jet pipe 6 is connected to the inner cavity of the liquid storage tank 9; an air inlet pipe 8 connected to the air inlet of the jet pipe 6 is provided on the outer wall of the liquid storage tank 9 at the position corresponding to the air inlet of the jet pipe 6; an exhaust pipe 7 connected to the inner cavity of the liquid storage tank 9 is provided on the outer wall of the liquid storage tank 9 near the connection between the column section 3 and the liquid storage tank 9; and a drain pipe 10 is provided at the bottom of the liquid storage tank 9.

[0027] To ensure sufficient shear force, the cone angle of the cone segment 4 is 20° to 40°.

[0028] like Figure 2 As shown, the jet tube 6 adopts a Venturi jet tube structure, including a constriction section, a throat, and a diffuser section. The working principle of the jet tube is as follows: after the fluid enters the jet tube from the inlet section, it accelerates through the constriction section, reaches its maximum speed and minimum pressure when passing through the throat, and then enters the diffuser section to decelerate and diffuse before finally being discharged.

[0029] More preferably, the diameter of the liquid storage tank 9 is the same as the diameter of the column segment 3, and the height of the liquid storage tank 9 is 3 to 5 times the diameter of the column segment 3.

[0030] More preferably, the drain pipe 10 is equipped with an electric drain valve 11; the inner cavity of the storage tank 9 is equipped with a liquid level sensor 12. It is worth noting that the liquid level sensor 12 is electrically connected to the electric drain valve 11, and the liquid level sensor 12 detects the change in liquid level inside the storage tank 9 and controls the opening degree and discharge amount of the electric drain valve 11.

[0031] In use, firstly, high-pressure gas is introduced into the air inlet of the jet pipe 6 through the air inlet pipe 8. After the high-pressure gas enters the jet pipe 6, under the action of the Venturi principle, the gas is discharged from the outlet of the jet pipe 6 into the storage tank 9, which will then form a vacuum negative pressure at the inlet end of the jet pipe 6. The inlet end of the jet pipe 6 is connected to the conical section 4 through the underflow pipe 5, and the conical section 4 is connected to the inner cavity of the column section 3. Then, a vacuum negative pressure is formed in the inner cavity of the column section 3. At the same time, the exhaust fan draws air out from the outlet of the overflow pipe 2. Under the dual action, a stronger vacuum pressure is formed in the inner cavity of the column section 3. The solid-liquid-gas three-phase foam enters the column section 3 tangentially from the feed pipe 1, and changes from high-speed linear motion to downward rotational motion. Under the strong turbulence at the inlet of the jet pipe 6, the foam is defoamed for the first time.

[0032] Next, the foam rotates downward along column segment 3, forming a combined vortex motion pattern of inner and outer double vortices under the combined action of the column and cone structure. Due to the low density of the foam, it will move radially from the outside to the inside under the action of centrifugal force. When it moves into the range of the forced vortex, the foam is further pulled and broken under the action of strong shear force and strong pressure gradient force, completing the secondary defoaming.

[0033] Then, the broken gas rotates upward under the action of the inner swirling flow and is discharged from the overflow pipe 2. The solid particles separated after the breakage and the small foam formed after the breakage, due to their increased specific gravity, overcome the centrifugal force and re-enter the outer swirling flow. Under the action of the outer swirling flow, they enter the underflow pipe 5 and, under the negative pressure suction of the jet pipe 6, the solid-liquid two-phase mixture and the broken small foam enter the jet pipe 6. Under the impact of the high-speed airflow in the jet pipe 6, the foam is completely broken. The broken solid-liquid two-phase mixture enters the storage tank 9 from the outlet of the jet pipe for temporary storage and is intermittently discharged. It is worth noting here that the high-pressure gas entering the storage tank 9 is discharged from the exhaust pipe 7 at the top of the storage tank 9 after the pressure is released.

[0034] Finally, when the liquid level in the storage tank 9 reaches the height set by the liquid level sensor 12, the electric drain valve 11 automatically opens to discharge the liquid; when the liquid level is lower than the set threshold of the liquid level sensor 12, the electric drain valve 11 automatically closes to prevent gas from entering the drain pipe 10 and forming secondary foam.

[0035] This invention has a simple and reasonable structure, is easy to operate, and combines the Venturi principle with the strong shear force, strong pressure gradient and strong impact force formed by swirling flow to eliminate foam. It can efficiently and quickly achieve multiple defoaming and will not generate secondary foam during discharge.

[0036] In this utility model, terms such as "upper," "lower," "bottom," and "top" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are merely used to facilitate the description of the structural relationships of the various components or elements of this utility model and do not specifically refer to any part or element of this utility model; they should not be construed as limiting this utility model. Terms such as "connected" and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be determined according to the specific circumstances, and they should not be construed as limiting this utility model.

[0037] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A swirling defoaming device based on air jet, characterized in that, It includes a column section, a conical section, a liquid storage tank, and a jet pipe; the liquid storage tank is located at the bottom of the column section; the conical section is located inside the liquid storage tank and its top is fixed to the top of the liquid storage tank's inner cavity; the column section, the conical section, and the liquid storage tank are fixedly connected by a flange; An overflow pipe is provided at the top of the column segment; a feed pipe communicating with the inner cavity of the column segment is provided on the outer side wall of the column segment near its top. The inlet of the jet pipe is connected to the bottom of the conical section through an underflow pipe; the outlet of the jet pipe is connected to the inner cavity of the storage tank. An exhaust pipe communicating with the inner cavity of the liquid storage tank is provided on the outer wall of the liquid storage tank near the connection between the column section and the liquid storage tank; an air inlet pipe communicating with the air inlet of the jet pipe is provided on the outer wall of the liquid storage tank at the position corresponding to the air inlet of the jet pipe; and a drain pipe is provided at the bottom of the liquid storage tank.

2. The swirling defoaming device based on air jet according to claim 1, characterized in that, The diameter of the overflow pipe is 0.35 to 0.4 times the diameter of the column section; The top of the overflow pipe extends beyond the top of the column section and connects to the fan. The bottom of the overflow pipe extends into the inner cavity of the column section for a length of 0.75 to 1 times the diameter of the column section.

3. The swirling defoaming device based on air jet according to claim 1, characterized in that, The diameter of the feed pipe is 0.3 to 0.35 times the diameter of the column section.

4. The swirling defoaming device based on air jet according to claim 1, characterized in that, The cone angle of the cone segment is 20° to 40°.

5. The swirling defoaming device based on air jet according to claim 1, characterized in that, The diameter of the underflow pipe is 0.25 to 0.35 times the diameter of the column section.

6. The swirling defoaming device based on air jet according to claim 1, characterized in that, The jet tube includes a constriction section, a throat, and a diffuser section.

7. The swirling defoaming device based on air jet according to claim 1, characterized in that, The diameter of the storage tank is the same as the diameter of the column section, and the height of the storage tank is 3 to 5 times the diameter of the column section.

8. The swirling defoaming device based on air jet according to claim 1, characterized in that, The drain pipe is equipped with an electric drain valve; the inner cavity of the storage tank is equipped with a liquid level sensor, and the liquid level sensor is electrically connected to the electric drain valve.

9. The swirling defoaming device based on air jet according to claim 1, characterized in that, A sealing ring is provided at the connection between the column section, the cone section, the liquid storage tank and the flange.

10. The swirling defoaming device based on air jet according to claim 1, characterized in that, The cone segment is a frustum structure with openings at the top and bottom.

Images