Oil-gas separation container

Abstract

The utility model discloses an oil-gas separation container, and relates to the technical field of refrigeration. The oil tank comprises a tank body, a liquid / gas outlet, a plurality of liquid / gas inlets, a fluid structure, a screen and an oil outlet, wherein the liquid / gas outlet and the liquid / gas inlets are sequentially arranged from the top to the bottom of the tank body; the screen is arranged below the liquid / gas inlet and divides the internal space of the tank body into an upper chamber and a lower chamber; the fluid structure comprises a horn-shaped liquid / gas collecting port and a channel, and the fluid structure is communicated with the liquid / gas outlet through the channel; and the pressure of the working environment of the tank body is in the range of 2.0-10.0 MPa. According to the utility model, a certain working pressure is applied to the oil / gas separation container to separate lubricating oil dissolved in refrigeration equipment which takes liquid CO2 as a medium, and then the mesh screen is arranged in the oil separation container to carry out final oil filtration.

Description

Technical Field

[0001] The utility model belongs to the technical field of refrigeration, in particular to an oil-gas separation container. Background Art

[0002] When carbon dioxide is used as a refrigerant, system pressures are extremely high. Its saturation pressure at 0°C is seven times higher than that of R22, and its suction and exhaust pressures are 10 MPa and 3 MPa higher, respectively. Furthermore, it exhibits exceptional solubility at supercritical pressures and exhibits its acidic nature in the presence of water. Under supercritical conditions, carbon dioxide is an effective solvent for various hydrocarbons. Because the exhaust gas from a carbon dioxide compressor is in a supercritical state, lubricant carryover will occur under all conditions due to the solubility of supercritical carbon dioxide. The lubricant provides effective power to the compressor within the system's operating conditions and temperature range without affecting the system's operational capabilities.

[0003] From the above characteristics of carbon dioxide and lubricating oil, it can be seen that the compressor lubricating oil and the refrigerant must be miscible; otherwise, the lubricating oil will be deposited in the heat exchanger to form an oil film, which will not only affect the heat exchange effect but also cause the compressor to lack oil, resulting in a series of problems; and because no matter what the circumstances, the liquid high-temperature and high-pressure transcritical CO2 output by the transcritical CO2 heat conversion unit will also absorb various oil pollutants in the process of forming gaseous CO2 after passing through the heating equipment end, so it is also necessary to separate the mixed gaseous CO2 with oil pollutants from oil and gas. Utility Model Content

[0004] The purpose of the utility model is to provide an oil-gas separation container, which realizes the process of separating the lubricating oil dissolved in the refrigeration equipment with liquid CO2 as the medium by applying a certain working pressure in the oil-liquid / gas separation container, thereby solving the problem that the lubricating oil dissolved in the refrigeration equipment with CO2 as the medium cannot be separated.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The utility model discloses an oil-gas separation container, comprising a tank body, on which are arranged in sequence from the top to the bottom of the tank body a liquid / gas outlet, a plurality of liquid / gas inlets, a fluid structure located inside the tank body, a screen, and an oil outlet; the screen is arranged below the liquid / gas inlet and divides the internal space of the tank body into an upper and a lower chamber; and the fluid structure comprises a bell-shaped liquid / gas collecting port and a channel, and the fluid structure is connected to the liquid / gas outlet through the channel; the working environment pressure of the tank body is in the range of 2.0-10.0MPa.

[0007] Furthermore, the working environment pressure of the tank body is in the range of 2.0-3.0 MPa.

[0008] Furthermore, the working environment pressure of the tank is in the range of 8-10.0 MPa.

[0009] Furthermore, the fluid structure is centrally arranged in the upper chamber of the tank body.

[0010] Furthermore, the fluid structure is a rotating tubular structure.

[0011] Furthermore, the oil outlet is located at the bottom of the tank.

[0012] Furthermore, the sewage outlet is located at the bottom of the tank body.

[0013] Furthermore, an observation mirror for observing the position of the liquid inside the container is also provided on the peripheral side of the tank body.

[0014] Furthermore, a liquid level sensor is also provided inside the tank body.

[0015] The utility model has the following beneficial effects:

[0016] The utility model separates the lubricating oil dissolved in the refrigeration equipment with liquid CO2 as the medium by applying a certain working pressure in the oil / gas separation container, and then performs the final oil filtration by arranging a mesh screen in the oil / gas separation container.

[0017] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 This is a structural schematic diagram of an oil-gas separation container of this embodiment;

[0020] Figure 2 for Figure 1 Schematic diagram of the half-section structure;

[0021] Figure 3 Schematic diagram of the structure of the mesh screen;

[0022] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0023] 1-liquid / gas collecting port, 2-tank body, 201-liquid / gas outlet, 202-liquid / gas inlet, 203-observation mirror, 204-drain port, 205-fluid structure, 206-screen, 207-oil outlet. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention / utility model, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Various tank containers utilize vertical separation vessels. The principle behind this separation is to rely on gravity to settle liquids or separate them from gases. In a gravity separator, when a droplet no longer accelerates, it descends at a steady rate, known as the terminal velocity. At this velocity, all forces acting on the droplet are in equilibrium: drag and buoyancy balance gravity. Liquid that does not fall to the bottom of the separation vessel resembles small, stationary droplets in a cloud in the sky. They remain suspended in the sky, not falling as raindrops, because their diameter is not large enough (they lack mass) to fall. Instead, they are held in place by the buoyancy of the air and not small enough to be evaporated by the sun or blown away by the wind. The diameter of these droplets is defined as the critical droplet diameter for the separation calculation of a particular refrigerant. In a refrigeration system, as the temperature decreases, the mass of a refrigerant droplet of the same diameter increases (the lower the temperature, the higher the refrigerant density), and the droplet's upward velocity also increases. This increases the separation rate and, consequently, the separation capacity. This is why the separation capacity varies with decreasing evaporation temperature. Based on the above principles, a separation structure of the tank is designed to solve the problem of separating low-temperature and low-pressure gaseous CO2 or high-pressure and high-temperature liquid CO2 with lubricating oil.

[0026] Since the density of compressed supercritical carbon dioxide is lower than that of lubricating oil, the oil-liquid mixture entering the second tank body 2, under the influence of gravity, has a speed greater than the falling speed of supercritical CO2. Since the dynamic pressure of gas flow is formed inside the mesh 206, its upward flow forms an upward thrust. Since the volume mass of supercritical carbon dioxide is small, it will be deposited on the upper part of the tank body 2. At this time, the upper part of the mesh of the tank body 2 is an upward gas flow, and supercritical CO2 will be concentrated at the top of the tank body 2. At the same time, supercritical carbon dioxide enters from the side and flows along the wall. The contact area and volume decrease from large to small, forming a vortex, and the fluid will move upward. Since the fluid structure is similar to a trumpet-shaped mechanism, it has an effect similar to a vacuum cleaner. Therefore, according to the movement trajectory of the fluid, the separated transcritical carbon dioxide will come out from the top.

[0027] Example 1

[0028] In a combined cooling and heating unit based on transcritical carbon dioxide, gaseous CO2 is compressed by a transcritical carbon dioxide compressor to form high-temperature and high-pressure supercritical CO2.

[0029] like Figure 1 and Figure 2 As shown, this embodiment is an oil-gas separation container, including a tank body 2, on which a liquid / gas outlet 201, a plurality of liquid / gas inlets 202, a fluid structure 205 located inside the tank body 2, a screen 206, and an oil outlet 207 are sequentially arranged from the top to the bottom of the tank body 2; the liquid / gas inlet 202 generally corresponds to the high-temperature and high-pressure supercritical CO2 output by the transcritical carbon dioxide compressor. In this case, the liquid / gas inlet 202 is the liquid inlet, and the liquid / gas outlet 201 is the liquid outlet. The high-temperature and high-pressure supercritical CO2 carries the lubricating oil in the compressor.

[0030] The liquid / gas inlet 202 is set according to the number of corresponding transcritical carbon dioxide compressor units, generally one or two. Figure 3 As shown, the screen 206 is arranged below the liquid / gas inlet 202 and divides the internal space of the tank body 2 into two upper and lower chambers; and completely separates the gaseous carbon dioxide and the lubricating oil.

[0031] The fluid structure 205 is centrally disposed within the upper chamber of the tank body 2. The fluid structure 205 is a rotating tubular structure and includes a bell-shaped liquid / gas collection port 1 and a channel. The fluid structure 205 is connected to the liquid / gas outlet 201 via the channel 102. The liquid / gas collection port 1 is now the liquid collection port.

[0032] The oil outlet 207 is located at the bottom of the tank body 2. After separation, the lubricating oil returns to the oil inlet of the oil storage tank from the oil outlet 207 to replenish the oil to the compressor. The oil outlet 207 is connected to the oil inlet of the oil storage tank.

[0033] The drain port 204 is located at the bottom of the tank 2 to remove the accumulated oil impurities. It is also convenient for later maintenance and repair to empty the oil and relieve the pressure of the unit.

[0034] An observation mirror 203 is also provided on the side of the tank body 2 for observing the position of the liquid inside the container, using the refractive surface of a prism.

[0035] A liquid level sensor is also provided inside the tank body 2, and the liquid level sensor is installed at the position of the observation mirror 203, which is used to detect the displacement of the tank container in real time. If it is lower than the lowest position, it continues to advance, and if it is higher than the highest position, it stops advancing.

[0036] At this time, the working environment pressure of the tank body 2 is in the range of 8-10.0 MPa.

[0037] Example 2

[0038] In a transcritical CO2-based combined cooling and heating system, gaseous CO2 is compressed by a transcritical CO2 compressor to form high-temperature, high-pressure supercritical CO2. After passing through a heating device, the high-temperature, high-pressure supercritical CO2 is converted to low-temperature, low-pressure gaseous CO2 through heat exchange.

[0039] like Figure 1 and Figure 2 As shown, this embodiment is an oil-gas separation container, comprising a tank body 2. Disposed sequentially from the top to the bottom of the tank body 2 are a liquid / gas outlet 201, several liquid / gas inlets 202, a fluid structure 205 located within the tank body 2, a screen 206, and an oil outlet 207. The liquid / gas inlet 202 generally corresponds to the high-temperature, high-pressure supercritical CO2 output by a transcritical CO2 compressor. After passing through a heating device, the high-temperature, high-pressure supercritical CO2 undergoes heat exchange, becoming low-temperature, low-pressure gaseous CO2. In this case, the liquid / gas inlet 202 serves as the gas inlet, and the liquid / gas outlet 201 serves as the gas outlet. The low-temperature, low-pressure gaseous CO2 carries lubricating oil from various devices.

[0040] like Figure 3 As shown, the screen 206 is arranged below the liquid / gas inlet 202 and divides the internal space of the tank body 2 into upper and lower chambers; the fluid structure 205 is centrally arranged in the upper chamber of the tank body 2, and the fluid structure 205 is a rotating tubular structure.

[0041] The fluid structure 205 includes a bell-shaped liquid / gas collecting port 1 and a channel. The fluid structure 205 is connected to the liquid / gas outlet 201 through the channel 102. The liquid / gas collecting port 1 is now a gas collecting port.

[0042] The oil outlet 207 is located at the bottom of the tank body 2. After separation, the lubricating oil returns to the oil inlet of the oil storage tank from the oil outlet 207 to replenish the oil to the compressor. The oil outlet 207 is connected to the oil inlet of the oil storage tank.

[0043] The drain port 204 is located at the bottom of the tank 2 to remove the accumulated oil impurities. It is also convenient for later maintenance and repair to empty the oil and relieve the pressure of the unit.

[0044] An observation mirror 203 is also provided on the side of the tank body 2 for observing the position of the liquid inside the container, using the refractive surface of a prism.

[0045] A liquid level sensor is also provided inside the tank body 2, and the liquid level sensor is installed at the position of the observation mirror 203, which is used to detect the displacement of the tank container in real time. If it is lower than the lowest position, it continues to advance, and if it is higher than the highest position, it stops advancing.

[0046] At this time, the working environment pressure of the tank body 2 is in the range of 2.0-3.0 MPa.

[0047] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0048] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An oil-gas separation container, characterized in that: It comprises a tank body (2), wherein a liquid / gas outlet (201), a plurality of liquid / gas inlets (202), a fluid structure (205) located inside the tank body (2), a screen (206), and an oil outlet (207) are sequentially arranged from the top to the bottom of the tank body (2); The screen (206) is arranged below the liquid / gas inlet (202) and divides the internal space of the tank body (2) into an upper chamber and a lower chamber; The fluid structure (205) includes a bell-shaped liquid / gas collecting port (1) and a channel, and the fluid structure (205) is connected to the liquid / gas outlet (201) through the channel; The working environment pressure of the tank body (2) is in the range of 2.0-10.0 MPa.

2. The oil-gas separation container according to claim 1, characterized in that: The working environment pressure of the tank body (2) is in the range of 2.0-3.0 MPa.

3. The oil-gas separation container according to claim 1, characterized in that: The working environment pressure of the tank body (2) is in the range of 8-10.0 MPa.

4. The oil-gas separation container according to claim 1, characterized in that: The fluid structure (205) is centrally arranged in the upper chamber of the tank body (2).

5. The oil-gas separation container according to claim 1, characterized in that: The fluid structure (205) is a rotating tubular structure.

6. The oil-gas separation container according to claim 1, characterized in that: The oil outlet (207) is located at the bottom of the tank body (2).

7. The oil-gas separation container according to claim 1, characterized in that: A sewage outlet (204) is provided at the bottom of the tank body (2).

8. The oil-gas separation container according to claim 1, characterized in that: An observation mirror (203) for observing the position of the liquid inside the container is also provided on the peripheral side of the tank body (2).

9. The oil-gas separation container according to claim 1, characterized in that: A liquid level sensor is also provided inside the tank body (2).

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