Gas-solid separation device and vacuum deslagging system

Abstract

The utility model belongs to the technical field of equipment for separating particles in gas, and particularly provides a gas-solid separation device and a vacuum deslagging system. The gas-solid separation device comprises a tank body, the tank body is provided with a gas inlet and a gas outlet, an isolation cylinder extending up and down is further arranged in the tank body, the isolation cylinder is provided with a channel allowing gas entering from the gas inlet to flow towards the gas outlet, and the through-flow area of the upper end of the isolation cylinder is larger than that of the lower end of the isolation cylinder. The vacuum deslagging system comprises the gas-solid separation device. According to the utility model, the gas circulation path is actively changed under the condition that the overall volume of the tank body is not changed, and the gas flow rate is reduced. Meanwhile, due to the fact that the through-flow area of the upper end of the isolation cylinder is larger, the flow speed of the gas can be continuously reduced in the upward circulation process, and the better gas-solid separation effect is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of equipment for separating particles in gas, in particular to a gas-solid separation device and a vacuum slag discharging system. Background Art

[0002] The gas-solid separation device is used to separate the gas-solid two-phase flow, making the discharged gas cleaner and cleaner, thereby meeting environmental protection standards and facilitating the recovery or secondary use of gas and solid. In the field of tunnel construction, the gas-solid separation device is used in the vacuum slag removal system, which generally includes a basically closed tank body, which is provided with an air inlet, an air outlet and a slag discharge port. The air inlet is provided with an air inlet pipe for connecting the slag extraction pipeline, and the air outlet is used to connect the vacuum pump, and the air outlet is located above the air inlet, and the slag discharge port is located at the bottom. The gas-slag mixture enters the tank body from the air inlet, and the gas-slag separation is achieved under the action of gravity. After a certain amount of rock slag remains in the tank body, the slag discharge port is opened to discharge the rock slag.

[0003] Unlike the general industrial field, the air flow velocity in the vacuum slag system is high (otherwise it is difficult to extract larger pieces of slag), and small particles of slag (lighter) are easy to flow with the gas, making it difficult to separate gas and slag. However, the space in the tunnel is limited, which limits the volume of the tank body of the gas-solid separation device. In other words, the space inside the tank body for gas-solid two-phase flow to achieve separation (axial and radial directions of the tank body) is limited, that is, the path from the air inlet to the air outlet is short, which further increases the difficulty of gas-slag separation in high-speed airflow. In addition, the physical properties of slag particles in the tunnel vary greatly, and there may be dry powder, large particles, wet powder, mud, etc. The air inlet pipe of the traditional gas-solid separation device is arranged along the radial direction of the tank body, and the gas-slag mixture entering the tank body is easy to directly hit the inner wall of the tank body, especially when the tank body diameter is small and the air flow velocity is high. When extracting wet powder or mud, the wet powder or mud is also easy to adhere to the inner wall of the tank body to form a mud cake.

[0004] In combination with the relevant technology of centrifugal separation, such as the oil fume separation device disclosed in the Chinese utility model patent with authorization announcement number CN211176854U, it is easy to think of changing the air inlet pipe to be set along the tangent direction of the tank body. At this time, the gas-slag mixture entering the tank body will flow along the inner wall of the tank body. Under the action of inertia and gravity, the gas-slag mixture will spiral along the inner wall of the tank body, which can improve the effect of gas-slag separation to a certain extent and prevent wet powder or mud from sticking to the inner wall of the tank body. However, the applicant's research found that for a vacuum slag discharge system with high-speed airflow and clear restrictions on the volume of the tank body, simply changing the air inlet to be along the tangent direction of the tank body still cannot fully meet the needs of gas-slag separation. Utility Model Content

[0005] The purpose of the utility model is to provide a gas-solid separation device to solve the technical problem that the gas-solid separation device in the prior art is difficult to meet the gas-solid separation requirements under small space and high-speed airflow conditions. The purpose of the utility model is also to provide a vacuum slag discharge system to solve the technical problem that the vacuum slag discharge system has a poor gas-slag separation effect.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the gas-solid separation device provided by the utility model is:

[0007] A gas-solid separation device comprises a tank body, wherein the tank body is provided with an air inlet and an air outlet, and an isolation cylinder extending up and down is also provided in the tank body, wherein the isolation cylinder has a passage for gas entering from the air inlet to flow to the air outlet, and the flow area at the upper end of the isolation cylinder is larger than the flow area at the lower end.

[0008] As a further improvement, at least a portion of the air inlet is located above the lowermost end of the isolation tube.

[0009] As a further improvement, the air inlet is only partially located above the lowermost end of the isolation tube.

[0010] As a further improvement, the isolation tube is a trumpet-shaped trumpet.

[0011] As a further improvement, the air inlet is connected to an air inlet pipe, and the air inlet pipe is arranged along the tangential direction of the tank body.

[0012] As a further improvement, a filter screen is further provided in the tank body, and the filter screen is arranged above the isolation cylinder.

[0013] As a further improvement, the gas-solid separation device is also equipped with a filter vibrator.

[0014] As a further improvement, the tank body is also connected to a flushing pipe for flushing the filter screen.

[0015] As a further improvement, the flushing pipe extends into the tank body, and the flushing pipe is provided with a plurality of nozzles directed toward the filter screen.

[0016] The beneficial effect is: the utility model is an improved invention. Specifically, when in use, under the action of the isolation tube, the air outlet and the air inlet are directly separated. Therefore, after the high-speed airflow (gas-solid mixture) enters, the gas must flow upward through the isolation tube, which is equivalent to actively changing the gas flow path while the overall volume of the tank body remains unchanged, thereby reducing the gas flow rate. At the same time, since the flow area at the upper end of the isolation tube is larger, the flow rate of the gas will continue to decrease during the upward flow. At this time, the process of gas circulation in the isolation tube is also a process of further separating small particles of solids, thereby achieving a better gas-solid separation effect. It can be seen from the analysis that the utility model achieves a better gas-solid separation effect without increasing the overall volume of the tank body by setting a "small at the bottom and large at the top" isolation tube in the tank body, and is suitable for working conditions with high-speed airflow.

[0017] In order to achieve the above-mentioned purpose, the technical solution of the vacuum slag discharging system provided by the utility model is:

[0018] A vacuum slag removal system includes a gas-solid separation device for connecting to a vacuum pump, the gas-solid separation device includes a tank body, the tank body is provided with an air inlet and an air outlet, and the tank body is also provided with an isolation cylinder extending up and down, the isolation cylinder has a channel for gas entering from the air inlet to flow to the air outlet, and the flow area of ​​the upper end of the isolation cylinder is larger than the flow area of ​​the lower end.

[0019] As a further improvement, at least a portion of the air inlet is located above the lowermost end of the isolation tube.

[0020] As a further improvement, the air inlet is only partially located above the lowermost end of the isolation tube.

[0021] As a further improvement, the isolation tube is a trumpet-shaped trumpet.

[0022] As a further improvement, the air inlet is connected to an air inlet pipe, and the air inlet pipe is arranged along the tangential direction of the tank body.

[0023] As a further improvement, a filter screen is further provided in the tank body, and the filter screen is arranged above the isolation cylinder.

[0024] As a further improvement, the gas-solid separation device is also equipped with a filter vibrator.

[0025] As a further improvement, the tank body is also connected to a flushing pipe for flushing the filter screen.

[0026] As a further improvement, the flushing pipe extends into the tank body, and the flushing pipe is provided with a plurality of nozzles directed toward the filter screen.

[0027] The beneficial effect is that the utility model is an improved invention. Specifically, when the vacuum slag removal system extracts rock slag during tunnel construction, the air outlet and the air inlet are directly separated, and the gas must flow upward through the isolation tube, which is equivalent to actively changing the gas flow path while the overall volume of the tank body remains unchanged, thereby reducing the gas flow rate. At the same time, since the flow area at the upper end of the isolation tube is larger, the flow rate of the gas will continue to decrease during the upward flow. At this time, the process of gas circulation in the isolation tube is also a process of further separating small particles of rock slag, thereby achieving a better gas-slag separation effect. It can be seen from the analysis that the utility model achieves a better gas-slag separation effect without increasing the overall volume of the tank body by setting a "small at the bottom and large at the top" isolation tube in the tank body, thereby improving the gas-slag separation effect of the vacuum slag removal system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of an embodiment of a gas-solid separation device in the utility model;

[0029] Figure 2 It is a top view of an embodiment of the gas-solid separation device in the utility model (with the cover plate hidden);

[0030] Description of reference numerals:

[0031] 1. Cover plate; 2. Tank body; 3. Flushing pipe; 4. Filter vibrator; 5. First air inlet pipe; 6. Solid discharger; 7. Isolation cylinder; 8. Filter; 9. Air outlet pipe; 10. Second air inlet pipe. DETAILED DESCRIPTION

[0032] After the high-speed gas-solid mixture enters the tank of the gas-solid separation device, the lighter small solid particles tend to flow with the gas, making separation difficult. The existing technology generally adopts the solution of increasing the volume of the tank to increase the airflow path. However, unlike the open environment outside, the overall volume of the vacuum slag removal system used in tunnel construction is limited by the actual space inside the tunnel, and it is difficult to increase the airflow path by increasing the volume of the tank.

[0033] In view of the above problems, the basic technical concept of the utility model is to configure an isolation cylinder inside the tank body to isolate the air inlet and the air outlet, and configure the isolation cylinder to be a cylinder with a lower flow area smaller than the upper flow area. At this time, the gas-solid mixture entering from the air inlet flows to the air outlet through the isolation cylinder, and the flow rate of the gas-solid mixture will decrease. At the same time, while the gas flows inside the isolation cylinder, the gas flow rate will be further reduced due to the larger upper flow area. Therefore, under the condition of high-speed airflow, the utility model achieves the effect of improving gas-solid separation without increasing the volume of the tank body.

[0034] The present invention is further described in detail below in conjunction with the embodiments.

[0035] Specific embodiments of the gas-solid separation device provided by the utility model:

[0036] The gas-solid separation device provided in this embodiment is as follows Figure 1-Figure 2 As shown, it includes a basically sealed tank body 2, and a cover plate 1 is provided at the upper end of the tank body 2. The cover plate 1 can be opened movably, so as to facilitate the maintenance of the structure inside the tank body 2. The tank body 2 is provided with an air inlet, an air outlet and a solid discharge port. The solid discharge port is at the bottom. Under the action of gravity, the separated solids can fall to the solid discharge port. At the same time, the solid discharge port is provided with a solid discharger 6. When the solids do not need to be discharged, the solid discharger 6 is closed. After the solids in the tank body 2 are retained to a certain height, the solid discharger 6 can be opened to discharge the solids. Preferably, the solid discharger 6 uses a star-shaped discharger. Of course, structures such as a plate gate and a knife gate are also feasible options. The air outlet is arranged above the air inlet, and the air outlet is connected to an air outlet pipe 9. For the gas-solid (slag) separation device used in the vacuum slag discharge system, the air outlet is used to connect to the vacuum pump. The purpose of setting the air outlet pipe 9 is to facilitate docking with different equipment. Of course, in other embodiments, only the air outlet is opened in the tank body 2. When it is used, if it is necessary to dock with other equipment, the pipeline of the equipment is inserted into the tank body 2. There are two air inlets, and the two air inlets are connected to a first air inlet pipe 5 and a second air inlet pipe 10 respectively. For the gas (solid) slag separation device used in the vacuum system, the first air inlet pipe 5 and the second air inlet pipe 10 are used to connect with the slag extraction pipeline. In other embodiments, the air inlet is not limited to two, and it is also feasible to set one or three. Of course, it is also possible not to set an air inlet pipe, and directly insert the air inlet pipeline (slag extraction pipeline) into the air inlet.

[0037] like Figure 1 As shown, the interior of the tank body 2 is also provided with an isolation cylinder 7 extending up and down, and the isolation cylinder 7 is fixed on the inner wall of the tank body 2, and can be fixed specifically by bolts or welding. The isolation cylinder 7 serves to isolate the air inlet and the air outlet, and the space inside it forms a channel for air flow. The flow area at the upper end of the isolation cylinder 7 is larger than the flow area at the lower end. At this time, during the process of the airflow flowing upward from the interior of the isolation cylinder 7, the gas flow rate will be further reduced. In order to avoid pressure holding, the flow area at the lower end of the isolation cylinder 7 should match the flow area of ​​the air inlet.

[0038] When in use, for example, when applied to a vacuum slag discharge system, after the gas-slag mixture entering through the first air inlet pipe 5 and the second air inlet pipe 10 enters the tank body 2, the gas will not be discharged directly from the gas outlet under the action of the isolation tube 7, that is, the airflow direction is constrained by the isolation tube 7, and the flow rate will be reduced during this process. At the same time, when the gas flows in the isolation tube 7, the flow rate inside the isolation tube 7 will be further reduced due to the larger flow area at the upper end. Therefore, for high-speed airflow, this embodiment can effectively reduce the flow rate of the gas, and naturally has a better separation effect.

[0039] like Figure 2 As shown, further, the first air inlet pipe 5 and the second air inlet pipe 10 are arranged along the tangent direction of the tank body 2. At this time, under the action of gravity and inertia, the airflow entering the tank body 2 can spiral along the inner wall of the tank body 2, which is equivalent to forming a vortex, and the separation effect is better. At the same time, when conveying wet powder or mud mixture, this can also avoid the phenomenon of mud cake on the inner wall of the tank body 2. For special use occasions of dry powder, in other embodiments, the first air inlet pipe 5 and the second air inlet pipe 10 may not be strictly arranged along the tangent direction of the tank body 2.

[0040] In this embodiment, the position of the air inlet is substantially flush with the position of the lowermost end of the isolation tube 7. Specifically, a portion of the air inlet is located below the lowermost end of the isolation tube 7, and a portion of the air inlet is located above the lowermost end of the isolation tube 7. At this time, firstly, the vertical space of the tank body 2 can be better utilized. While ensuring that the isolation tube 7 is relatively long, the overall height of the tank body 2 is still controllable, and the position of the air inlet will not be too low, ensuring that the tank body 2 can retain more solids. At the same time, compared with setting the air inlet below the isolation tube 7, the isolation tube 7 also has the function of blocking the airflow, preventing the airflow from flowing directly through the isolation tube 7 after entering the tank body 2, and the separation effect is better. In addition, when the air inlet pipe is arranged tangentially, the annular space between the isolation tube 7 and the inner wall of the cylinder is equivalent to forming a guide space for the airflow, which has a guiding effect on the spiral airflow and is more likely to form a spiral airflow. In other embodiments, the position of the air inlet can be set completely above the lowermost end of the isolation tube 7. However, considering that the cross-sectional area of ​​the upper end of the isolation tube 7 is relatively large, that is, the annular space between the isolation tube 7 and the inner wall of the tank body 2 is narrow, in order to avoid solids from being stuck between the isolation tube 7 and the inner wall of the tank body 2, the position of the air inlet should not be set at a position that is too high.

[0041] The isolation tube 7 is preferably as follows Figure 1 The trumpet shape shown, that is, the isolation tube 7 is a trumpet. The trumpet is easy to process and has low cost. At the same time, the flow area of ​​the trumpet gradually increases from bottom to top. When in use, the flow velocity of the airflow is reduced steplessly and continuously, and the deceleration effect is more stable. Of course, in other embodiments, the isolation tube 7 can also be a funnel-shaped isolation tube 7.

[0042] In order to enhance the separation effect of fine particles, in this embodiment, a filter screen 8 is further provided in the tank body 2, and the filter screen 8 is arranged above the isolation cylinder 7. Specifically, the number of layers of the filter screen 8 is not limited, and those skilled in the art can flexibly set it according to actual needs. In order to avoid the particles blocking the filter screen 8 during long-term use, the present embodiment is also equipped with a filter screen vibrator 4, and the particles adhering to the filter screen 8 are removed by the vibration of the filter screen vibrator 4. Of course, in other embodiments, if the filter screen vibrator 4 is not configured, the filter screen 8 can be taken out and replaced when the filter screen 8 is blocked. Specifically, the filter screen vibrator 4 can be a reciprocating impact vibrator, such as a cam vibrator, a vibrator driven by an oil cylinder or a cylinder, etc. The filter screen vibrator 4 can also be an ultrasonic vibrator. During installation, the filter screen vibrator 4 can be arranged inside the tank body 2, and the vibration is directly output to the filter screen 8. Of course, the filter screen vibrator 4 can also be arranged outside the tank body 2, and the vibration is transmitted to the filter screen 8 through the tank body 2.

[0043] At the same time, this embodiment is also equipped with a flushing system. Specifically, the tank body 2 is connected to a flushing pipe 3, which is a water pipe that can pass flushing water into the tank body 2 to clean the filter screen 8. Figure 1 and Figure 2 As shown, the flushing pipe 3 extends to the inside of the tank body 2 and is provided with a nozzle facing the filter screen 8. At this time, the water in the flushing pipe 3 can be sprayed out from the nozzle and directly sprayed onto the filter screen 8 along the axial direction of the tank body 2, thereby achieving a better cleaning effect. In other embodiments, the flushing pipe 3 can also be connected only to the inner wall of the tank body 2, and the water in the flushing pipe 3 is sprayed into the tank body 2 along the radial direction of the tank body 2 and falls on the filter screen 8 in a dispersed parabolic trajectory.

[0044] Of course, the filter 8 is not necessarily provided in the tank body 2. In some embodiments, the filter 8 may be provided at the end of the air outlet pipe 9, which can also play a role in separating fine particles.

[0045] Specific embodiment of the vacuum slag discharging system in the utility model:

[0046] The vacuum slag removal system includes a vacuum pump, a slag extraction pipeline and a gas-solid separation device. The gas-solid separation device has the same structure as the gas-solid separation device in the above-mentioned embodiment of the gas-solid separation device, and will not be described in detail here.

[0047] Finally, it should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments without creative work, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A gas-solid separation device, comprising a tank body, the tank body being provided with an air inlet and an air outlet, characterized in that: The tank body is also provided with an isolation cylinder extending up and down, which has a passage for gas entering from the air inlet to flow to the air outlet, and the flow area of ​​the upper end of the isolation cylinder is larger than the flow area of ​​the lower end.

2. The gas-solid separation device according to claim 1, characterized in that: At least a portion of the air inlet is located above the lowermost end of the isolation tube.

3. The gas-solid separation device according to claim 2, characterized in that: The air inlet is only partially located above the lowermost end of the isolation tube.

4. The gas-solid separation device according to claim 1, 2 or 3, characterized in that: The isolation tube is a trumpet-shaped trumpet.

5. The gas-solid separation device according to claim 1, 2 or 3, characterized in that: The air inlet is connected with an air inlet pipe, and the air inlet pipe is arranged along the tangential direction of the tank body.

6. The gas-solid separation device according to claim 1, 2 or 3, characterized in that: A filter screen is also provided in the tank body and is arranged above the isolation cylinder.

7. The gas-solid separation device according to claim 6, characterized in that: The gas-solid separation device is also equipped with a filter vibrator.

8. The gas-solid separation device according to claim 6, characterized in that: The tank body is also connected with a flushing pipe for flushing the filter screen.

9. The gas-solid separation device according to claim 8, characterized in that: The flushing pipe extends into the tank body and is provided with a plurality of nozzles facing the filter screen.

10. A vacuum slag removal system, comprising a gas-solid separation device connected to a vacuum pump, characterized in that: The gas-solid separation device is the gas-solid separation device according to any one of claims 1 to 9.

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