A double-rotor composite gas-liquid separator capable of automatically draining liquid

Abstract

The application discloses a double-rotor composite gas-liquid separator capable of automatically discharging liquid, which comprises a supporting assembly, two rotors, an inner cylinder, a liquid blocking ring, an outer cylinder, a baffle, a water-containing shell, an exhaust port, a floating block, a liquid discharging device and a liquid discharging nozzle. One rotor is arranged in each of two centrifugal separation liquid removal zones, and a gravity separation zone is arranged after the centrifugal separation liquid removal zones. Liquid is continuously accumulated to the liquid discharging device after separation, and air is discharged into other gas pipelines through the exhaust port after liquid removal. When the liquid level in the liquid discharging device reaches a designed value, the floating block floats, and the liquid is discharged through the liquid discharging nozzle. When the liquid level drops below the designed value, the floating block sinks under the action of gravity and the pressure difference between the inside and outside of the cavity, thereby achieving the sealing effect. The application has the advantages of compact structure, high separation efficiency, guaranteed maximum separation efficiency of the gas-liquid separator in a limited space, automatic liquid discharge and continuous liquid discharge under the condition of no external power supply, and prevention of air leakage of the air induction pipeline through the liquid discharging nozzle in the closed state.

Description

Technical Field

[0001] This invention is applicable to fields such as aircraft, ships, and gas turbines, and specifically relates to a dual-rotor guide vane type, composite gas-liquid separator with automatic liquid drainage, belonging to the technical field of gas-liquid separators. Background Technology

[0002] Gas-liquid separators are widely used in heat pumps and refrigeration systems. The basic principle is that during the pressurization or cooling of saturated gas, a portion of the condensable gas will form small droplets that flow with the gas. By utilizing the difference in static pressure between the gas and liquid, the gas and liquid in the pipeline system can be separated to achieve condensate recovery or gas purification.

[0003] The existing technology "Qi Binbin. Numerical simulation and experimental study of axial flow gas-liquid separator [D]. China University of Petroleum (East China), 2018. DOI:10.27644 / d.cnki.gsydu.2018.001425." analyzes and studies the influence of the structure of the guide vanes (including the guide vane outlet angle, number of vanes, diameter of the central column, blade thickness, and whether the blades have straight sections) on the separation efficiency and pressure drop, but it is still limited to the concept of a single rotor axial flow separator.

[0004] like Figure 1 The image shows the structure of a traditional single-type (pure centrifugal) gas-liquid separator. Traditional gas-liquid separators still have many problems in use, including:

[0005] (1) Misalignment between the inlet gas column and the rotor shaft is likely to occur, resulting in reduced separation efficiency;

[0006] (2) There are many problems in the pneumatic layout that lead to low separation efficiency. For example, the rotor is not placed properly, the rotor is too close to the air inlet and too far from the inner cylinder outlet, resulting in low rotation speed of the air column when it reaches the inner cylinder outlet through the rotor, and low separation efficiency.

[0007] (3) The expansion section is not equipped with an opening section for water separation, the distance between the opening sections is too small, and a single separator method is used, etc.

[0008] (4) The drain port of the gas-liquid separator cannot be automatically sealed, resulting in gas leakage in the separator and unstable pressure in the separation system. Summary of the Invention

[0009] In view of the problems existing in the prior art gas-liquid separator, the present invention aims to provide a dual-rotor composite gas-liquid separator with automatic liquid drainage, which solves the problems of low separation efficiency and gas leakage of the existing single-rotor gas-liquid separator.

[0010] To solve the above problems, the present invention adopts the following solution approach:

[0011] The centrifugal separation zone of the gas-liquid separator is divided into at least two centrifugal separation liquid-removing zones, and one rotor is arranged in each of the two liquid-removing zones, so that the gas column at the gas inlet of each liquid-removing zone is completely centered with the axis of the rotor, and when the gas flow at the gas inlet flows through the rotor, the liquid is thrown out under the action of centrifugal force due to the difference in static pressure difference between the gas and the liquid, and enters the liquid discharge device through the liquid blocking ring. On the other hand, gravity separation is continued after centrifugal separation, thereby further improving the separation efficiency. At the same time, a support assembly is arranged in the separator to strengthen the structural strength of the separator and reduce the damage of gas-liquid oscillation at the gas inlet to the overall structural strength.

[0012] A closed cavity is arranged at the lower end of the gas-liquid separator for collecting the separated liquid, and a liquid discharge nozzle and a float are arranged in the cavity, the float floats up and down under the action of buoyancy, and the liquid discharge nozzle is automatically opened and closed through the action of buoyancy.

[0013] Specifically, the solution of the present application is as follows:

[0014] A double-rotor composite gas-liquid separator capable of automatically discharging liquid, comprising,

[0015] An inner cylinder, the inner part of the inner cylinder comprises at least a first centrifugal separation liquid-removing zone and a second centrifugal separation liquid-removing zone, the first centrifugal separation liquid-removing zone and the second centrifugal separation liquid-removing zone are two straightly extended channels with circular cross sections, the axial first end of the channel forms a gas inlet, the axial second end of the channel forms an outlet, a first liquid outlet hole is opened in the vicinity of the outlet, the first liquid outlet hole is distributed on the circumferential surface of the channel, and the first centrifugal separation liquid-removing zone and the second centrifugal separation liquid-removing zone are arranged symmetrically about the center of the axis of the inner cylinder and parallel to the axis of the inner cylinder;

[0016] A support assembly, the support assembly is arranged at least at the gas inlet of the first centrifugal separation liquid-removing zone and the second centrifugal separation liquid-removing zone in the inner cylinder;

[0017] A rotor, the rotor comprises a first rotor and a second rotor which are completely identical, wherein the first rotor is arranged in the first centrifugal separation liquid-removing zone and the rotation axis of the first rotor is parallel to the axis of the inner cylinder, the second rotor is arranged in the second centrifugal separation liquid-removing zone and the rotation axis of the second rotor is parallel to the axis of the inner cylinder, and the axial distance from the first rotor and the second rotor to the respective gas inlet is equal;

[0018] The liquid blocking ring is arranged at the outlet of the first centrifugal separation liquid removal area and the second centrifugal separation liquid removal area respectively and coaxial with the space area where the first liquid outlet hole is located, and the second liquid outlet hole is opened on the liquid blocking ring, the distance from the second liquid outlet hole to the rotation center of the rotor is greater than the distance from the first liquid outlet hole to the rotation center of the rotor, and the water containing shell is located outside the first centrifugal separation liquid removal area and the second centrifugal separation liquid removal area, so that the first liquid outlet hole and the second liquid outlet hole are located in the inner cavity of the water containing shell, and the liquid discharge port is opened on the water containing shell.

[0019] The outer cylinder includes a first cylinder segment, a second cylinder segment and a third cylinder segment, the first cylinder segment is inserted into the outlet of the inner cylinder and coaxially communicated with the first centrifugal separation liquid removal area and the second centrifugal separation liquid removal area, an annular channel is formed between the outer surface of the first cylinder segment and the liquid blocking ring and at least a part of the space area where the liquid outlet hole is located, the second cylinder segment is communicated with the first cylinder segment, and the inner diameter of the second cylinder segment is greater than the inner diameter of the first cylinder segment, the inner cavity of the second cylinder segment forms a gravity separation cavity, the second cylinder segment is communicated with the third cylinder segment, and the inner diameter of the third cylinder segment is smaller than the inner diameter of the second cylinder segment, the liquid discharge port is opened on the second cylinder segment, and the baffle is arranged at the junction of the third cylinder segment and the second cylinder segment, and the exhaust port is opened on the third cylinder segment.

[0020] The liquid discharge device is arranged outside the inner cylinder and the water containing shell, the liquid discharge device includes a cabin, a liquid discharge nozzle and a float, the inner cavity of the cabin is communicated with the liquid discharge port of the water containing shell and the liquid discharge nozzle, and one end of the float is inserted into the communication channel of the liquid discharge nozzle and the inner cavity of the cabin.

[0021] Further, the inner cylinder includes a front cylinder and a rear cylinder connected in sequence along the axial direction of the inner cylinder, and the front cylinder and the rear cylinder are connected into one body by argon arc welding.

[0022] Further, the support assembly includes a first support plate located at the air inlet of the first centrifugal separation liquid removal area and the second centrifugal separation liquid removal area, and a second support plate located between the first centrifugal separation liquid removal area and the second centrifugal separation liquid removal area in the inner cylinder, and the first support plate and the second support plate are fixed by a connecting plate.

[0023] Further, the rotor is arranged at the position of 1 / 2 of the axial length of the first centrifugal separation liquid removal area and the second centrifugal separation liquid removal area.

[0024] Further, the rotor is of a guide vane type structure.

[0025] Further, the exhaust port has a plurality of exhaust ports, which are respectively communicated with a plurality of different air outlet pipelines.

[0026] As an extension, the gas-liquid separator can also have three or more centrifugal separation liquid removal zones, which are symmetrically arranged about the inner cylinder axis, so that the gas column of the inlet gas can be well centered with the rotor axis, and the centrifugal separation efficiency is improved. The support assembly is used to strengthen the strength of the different centrifugal separation liquid removal zones and the inner cylinder as a whole, so as to avoid deformation of the separation zones or the cylinder caused by air flow impact, thereby affecting the centering and finally affecting the centrifugal separation efficiency.

[0027] Compared with the prior art, under the premise of the same space occupation volume, the double-rotor and double-inlet structure is adopted, so that the gas column of the inlet gas is centered with the rotor axis, the first liquid outlet hole is increased, the liquid content rate at the outlet of the centrifugal separation zone is reduced, the combination of centrifugal separation and gravity separation is selected, and finally the separation efficiency of the separator is greatly improved. The automatic liquid discharge device is used to automatically discharge liquid, so that the separator has the automatic liquid discharge function under the sealed condition, and the air leakage phenomenon is avoided.

[0028] The double-rotor composite gas-liquid separator provided by the application can effectively solve the problem of low separation efficiency caused by the misalignment of the rotor axis and the gas column of the inlet gas of the traditional gas-liquid separator, reduce the liquid content rate at the outlet of the centrifugal separation zone, and greatly improve the separation efficiency by using gravity separation after centrifugal separation. In addition, since the automatic opening and closing liquid discharge device is provided, the liquid discharge port of the gas-liquid separator is in a normally closed state before the liquid separated by the gas-liquid separator reaches the designed amount, so that air leakage is avoided, and the stability of the system air pressure is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a traditional single-rotor single-type gas-liquid separator;

[0030] Figure 2 is a double-rotor composite gas-liquid separator capable of automatically discharging liquid according to the application;

[0031] Figure 3 is a partial enlarged view of the liquid discharge device;

[0032] In the figure: 1-support assembly, 2-rotor, 3-inner cylinder, 4-liquid blocking ring, 5-outer cylinder, 6-baffle, 7-gas outlet, 8-float, 9-liquid discharge device, 10-liquid discharge nozzle, 11-centrifugal separation cavity, 12-gravity separation cavity. DETAILED DESCRIPTION

[0033] The application will be further described below in combination with the drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the application is limited to the following embodiments. Any modifications, replacements and changes made according to the ordinary technical knowledge and conventional means in the art without departing from the technical idea of the application are included in the scope of the application.

[0034] AsFigure 2 and Figure 3 As shown, the dual-rotor composite gas-liquid separator with automatic liquid drainage includes a support assembly 1, a rotor 2, an inner cylinder 3, a liquid-retaining ring 4, an outer cylinder 5, a baffle 6, a water-containing shell, an exhaust port 7, a float 8, a liquid drainage device 9, and a liquid drainage nozzle 10.

[0035] The inner cylinder 3 is provided with two centrifugal separation and liquid removal zones. The two centrifugal separation and liquid removal zones are two straight channels with circular cross-sections. The two channels are symmetrical about the axis of the inner cylinder 3 and are parallel to the axis of the inner cylinder 3. The left end of the channel is the air inlet and the right end of the channel is the outlet. The first support plate of the support assembly 1 is provided at the end of the channel near the air inlet. A second support plate is also provided inside the inner cylinder 3 and between the two centrifugal separation and liquid removal zones. The first support plate and the second support plate are fixedly connected by a connecting plate. Multiple first liquid outlet holes are evenly distributed on the circumferential surface of the channel near the outlet. The inner cylinder 3 is composed of a front cylinder and a rear cylinder connected together by argon arc welding; there are two rotors 2, which are respectively set in the two centrifugal separation and liquid removal zones of the inner cylinder 3, and the rotors 2 are guide vane type structures; the liquid baffle ring 4 is set on the right side of the space area where the first liquid outlet is located, and the liquid baffle ring 4 has a second liquid outlet. The liquid baffle ring 4 and the first liquid outlet are covered by the outer water-containing shell, so that the liquid flowing out of the first liquid outlet and the second liquid outlet can enter the inner cavity of the water-containing shell. The lower end of the water-containing shell has a drain port, and the liquid baffle ring 4 is connected to the inner cylinder 3 by argon arc welding. The outer cylinder 5 is sealed to the inner cylinder 3 from one end of the outlet of the inner cylinder 3. The outer cylinder 5 includes three sections, namely the first cylinder section, the second cylinder section and the third cylinder section. The third cylinder section is provided with three exhaust ports 7, which are connected to three different air outlet pipelines. The first cylinder section has two segments, which are respectively inserted into the outlets of the two centrifugal separation liquid removal zones. The air after liquid removal is introduced into other air intake pipelines through the outlets of the two liquid removal zones and the exhaust ports 7. That is, the air separated by the two centrifugal separation liquid removal zones is transferred into three air streams through the outer cylinder 5.

[0036] like Figure 2 and Figure 3The draining device 7 is a compartment located outside the inner cylinder 3 and the outer cylinder 5, enclosing part of the inner cylinder 3, the water-containing shell, and part of the outer cylinder 5. The inner cavity of the compartment is connected to the water-containing shell through a drain port at the lower end of the water-containing shell. After separation in the centrifugal separation and liquid removal zone, the liquid flows into the inner cavity of the water-containing shell through the first and second liquid outlets, and then flows into the inner cavity of the draining device 9 through the drain port. The float 8 and the drain nozzle 10 are located in the inner cavity of the draining device 9, with the float 8 positioned above the drain nozzle 10. The lower end of float 8 is inserted into the channel connecting the drain nozzle 10 and the cabin cavity. When the cabin cavity of the drain device 9 collects a sufficient amount (design volume) of liquid, float 8 floats upward, and its lower end gradually disengages from the channel connecting the drain nozzle 10 and the cabin cavity, allowing the liquid to flow out from the drain nozzle 10. When a large amount of liquid is discharged, the buoyancy of float 8 decreases, so the lower end of float 8 re-inserts into the channel connecting the drain nozzle 10 and the cabin cavity, blocking the liquid from flowing out of the drain nozzle 10.

[0037] As an alternative, the two rotors 2 in the two-way centrifugal separation and liquid removal zone of the inner cylinder 3 are guide vane impellers with a medium flow rate of 2160 kg / h and a pressure of 365 kPa.

[0038] In the gas-liquid separator of this invention, the discharge nozzle 10 of the discharge device 9 controls the discharge of liquid through the buoyancy of the float 8, while ensuring no air leakage when there is no liquid accumulation in the pipeline. The gas-liquid separator employs two centrifugal separation and liquid removal zones, each containing a dual rotor 2. The air column from the inlet of each centrifugal separation and liquid removal zone is completely concentrated at the center of the rotor 2. Under centrifugal force, the liquid is thrown out, and the gas flows out from the center of the hub. Tests have shown that the separation efficiency of this invention is approximately [a certain percentage] that of conventional separators. Figure 1 (twice as much as)

[0039] Unlike traditional separators, this invention features a drain device 9 located below the water-containing shell on the cylinder 2. Liquid ejected by the rotor 2 flows through the water-containing shell and ultimately enters the drain device 9. Figure 3 When the liquid level is below the design value, the draining device 9 is in a closed state under the action of the gravity of the float 8 and the pressure difference between the inner and outer cavities. When the liquid level reaches the design value, the float 8 floats up under the action of buoyancy, and the liquid is discharged through the drain nozzle 10. When the liquid level drops below the design value, the buoyancy disappears, and the draining device 9 is in a closed state again.

[0040] As described above, the present invention is a combined centrifugal and gravity gas-liquid separator, comprising... Figure 2 The centrifugal separation chamber 11 and gravity separation chamber 12 are shown. By rationally arranging the interior of the separator, a high-efficiency gas-liquid separator with a separation efficiency of 92% was obtained.

[0041] like Figure 2As shown, the present invention firstly incorporates a support structure at the air inlet to reduce the damage to the overall structural strength caused by gas-liquid oscillation. The dual-separation-chamber, dual-rotor 2 design ensures that the air column at the air inlet is aligned with the axis of the rotor 2, improving separation efficiency. The rotor 2 is rationally positioned; simulation calculations show that when the rotor 2 is placed at 1 / 2 of the axial length of the inner cylinder 3, the gas-liquid mixture can maintain a high tangential velocity at the outlet of the inner cylinder 3 while preventing excessive impact velocity within the gravity separation chamber 12. Secondly, an opening section, i.e., the first liquid outlet, is provided in the water separation section to allow the liquid ejected by the rotor 2 to be discharged in advance, reducing the liquid content at the outlet of the inner cylinder 3. A gravity separation chamber 12 is added on one side of the outlet of the inner cylinder 3. The gas-liquid mixture undergoes primary separation via the centrifugal separation chamber 11 of the centrifugal separator. After entering the outer cylinder 5, the gas-liquid mixture still has a high tangential velocity. The liquid will collide with the baffle 6 and, under the influence of gravity, enter the liquid chamber through the outlet (the liquid outlet on the second cylinder section). The gas will enter the downstream pipeline through the exhaust port 7, completing secondary separation. The automatic liquid discharge mechanism of the present invention is as follows Figure 2 and Figure 3 As shown, after separation, the liquid flows through the baffle ring 4 and the water-containing shell, and continuously accumulates in the draining device 9. When the liquid level in the draining device 9 reaches the design value ( Figure 3 When the liquid level drops below the designed value, the float 8 rises, and the liquid is discharged through the drain nozzle 10. When the liquid level drops below the designed value, it sinks under the influence of gravity of the float 8 and the pressure difference between the inside and outside of the cavity, thus achieving a sealing effect. This invention has a compact structure and high separation efficiency, ensuring that the gas-liquid separator achieves maximum separation efficiency within a limited space. Under conditions without power or other external conditions, it achieves automatic liquid discharge through the buoyancy of the separated liquid, continuously separating liquids. In the closed state, the float can prevent air from leaking from the venting pipe through the drain nozzle 10.

[0042] The above description is merely one specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A dual-rotor composite gas-liquid separator with automatic liquid drainage, characterized in that: include, The inner cylinder includes at least a first centrifugal separation and liquid removal zone and a second centrifugal separation and liquid removal zone. The first centrifugal separation and liquid removal zone and the second centrifugal separation and liquid removal zone are two straight channels with circular cross-sections. An air inlet is formed at the first axial end of the channel, and an outlet is formed at the second axial end of the channel. A first liquid outlet is opened in the area near the outlet. The first liquid outlet is distributed on the circumferential surface of the channel. The first centrifugal separation and liquid removal zone and the second centrifugal separation and liquid removal zone are parallel to the axis of the inner cylinder and are symmetrically arranged about the center of the axis of the inner cylinder. The support assembly includes a first support plate located at the air inlet of the first centrifugal separation and liquid removal zone and the second centrifugal separation and liquid removal zone, and a second support plate located between the first centrifugal separation and liquid removal zone and the second centrifugal separation and liquid removal zone in the inner cylinder. The first support plate and the second support plate are fixed together by a connecting plate. The rotor includes an identical first rotor and a second rotor, wherein the first rotor is disposed in the first centrifugal separation and liquid removal zone and the axis of rotation of the first rotor is parallel to the axis of the inner cylinder, the second rotor is disposed in the second centrifugal separation and liquid removal zone and the axis of rotation of the second rotor is parallel to the axis of the inner cylinder, the axial distances of the first rotor and the second rotor to their respective air inlets are equal, and the rotor is disposed at 1 / 2 position of the axial length of the first centrifugal separation and liquid removal zone and the second centrifugal separation and liquid removal zone; The system includes a liquid-retaining ring and a water-containing shell. The liquid-retaining ring is respectively located at the outlet of the first centrifugal separation and liquid removal zone and the second centrifugal separation and liquid removal zone and is coaxial with the space area where the first liquid outlet is located. The liquid-retaining ring has a second liquid outlet, and the distance from the second liquid outlet to the rotor rotation center is greater than the distance from the first liquid outlet to the rotor rotation center. The water-containing shell is located outside the first centrifugal separation and liquid removal zone and the second centrifugal separation and liquid removal zone, so that both the first liquid outlet and the second liquid outlet are located in the inner cavity of the water-containing shell. The water-containing shell has a drain port. The outer cylinder includes a first cylinder section, a second cylinder section, and a third cylinder section. The first cylinder section is inserted into the outlet of the inner cylinder and is coaxially connected with the first centrifugal separation and liquid removal zone and the second centrifugal separation and liquid removal zone. An annular channel is formed between the outer surface of the first cylinder section, the liquid-blocking ring, and the spatial area where at least a portion of the liquid outlet holes are located. The second cylinder section is connected to the first cylinder section, and the inner diameter of the second cylinder section is larger than the inner diameter of the first cylinder section. The internal cavity of the second cylinder section forms a gravity separation chamber. The second cylinder section is connected to the third cylinder section, and the inner diameter of the third cylinder section is smaller than the inner diameter of the second cylinder section. A baffle is provided at the junction of the third cylinder section and the second cylinder section. A drain port is opened on the second cylinder section, and an exhaust port is opened on the third cylinder section. A draining device is provided on the outside of the inner cylinder and the water-containing shell. The draining device includes a chamber, a drain nozzle, and a float. The inner cavity of the chamber is connected to the drain port of the water-containing shell and the drain nozzle. One end of the float is inserted into the communication channel between the drain nozzle and the inner cavity of the chamber.

2. The dual-rotor composite gas-liquid separator with automatic liquid drainage according to claim 1, characterized in that: The inner cylinder includes a front cylinder and a rear cylinder connected sequentially along the inner cylinder axis, and the front cylinder and the rear cylinder are connected as one piece by argon arc welding.

3. The dual-rotor composite gas-liquid separator with automatic liquid drainage according to claim 1, characterized in that: The rotor has a guide vane structure.

4. The dual-rotor composite gas-liquid separator with automatic liquid drainage according to claim 1, characterized in that: The exhaust port has multiple outlets, each connected to a different air outlet pipe.

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