Demisting system for oil mist

Abstract

The utility model discloses a demisting system for oil mist, and belongs to the technical field of oil mist removal of lubricating systems. Comprising a venturi ejector (6), a material inlet of the venturi ejector (6) is connected with an oil tank (8) through a pipeline, a main gas inlet pipe (14) is connected with a power gas inlet of the venturi ejector (6), and an outlet of the venturi ejector (6) is connected with an inlet of an oil-gas separator (5). The device is characterized in that a negative pressure device for forming negative pressure at an outlet of the oil-gas separator (5) is arranged at the outlet of the oil-gas separator (5). In the demisting system for the oil mist, the negative pressure device is arranged at the outlet of the oil-gas separator, and the negative pressure formed by the negative pressure device is superposed with the air pressure at the inlet of the oil-gas separator, so that the air pressure of an oil-gas mixture in the oil-gas separator is increased, micro oil drops in a gas-liquid mixture can be conveniently collected by the gathering filter element, and the separation effect is ensured.

Description

Technical Field

[0001] The invention discloses an oil mist demisting system, belonging to the technical field of removing oil mist from a lubrication system. Background Art

[0002] In the production facilities of refining enterprises, there are a large number of large mechanical equipment such as steam turbines, compressors, and generators. As an important part of the lubrication system of these large equipment, the lubricating oil station plays a role in lubricating and cooling the rotating parts of the equipment. However, while the lubricating oil plays a lubricating effect, it will inevitably cause temperature rise due to the friction, shearing and heat transfer of the main engine gears or bearings. Repeated heating of the lubricating oil forms oil mist, which overflows from the exhaust port of the oil tank mixed with carbonized tiny particles. The overflowed oil mist cools in the air to form oil droplets. Arbitrary discharge will cause environmental pollution and increase oil loss, so it is necessary to set up an oil mist removal device.

[0003] Nowadays, there are two ways to deal with oil mist in industry: direct discharge and self-priming. The direct discharge type generally uses a fan, relying on the suction of the fan to extract the oil mist from the lubricating oil tank, such as the technical solution disclosed in the Chinese utility model patent with application number 202022854050.X, application date December 2, 2020, and patent name "an integrated oil mist removal device", and the technical solution disclosed in the Chinese utility model patent with application number 202122911404.4, application date November 25, 2021, and patent name "an oil mist removal lubrication system".

[0004] However, since the fan is an electrical device and is surrounded by an oil mist environment, it is not suitable to use the fan for oil mist treatment in the following occasions, and the self-priming method realized by the Venturi tube principle is used for demisting: the power wind provided by the power workshop passes through the Venturi tube, negative pressure is generated at the suction port, the oil mist in the lubricating oil tank is sucked out, and then the subsequent equipment (such as oil-gas separator) is used for oil-gas separation. For example, the technical solution disclosed in the Chinese utility model patent with application number 00245986.8, application date July 31, 2000, and patent name "A wet oil mist purifier", and the technical solution disclosed in the Chinese utility model patent with application number 201320854648.6, application date December 23, 2013, and patent name "A de-oiling mist device".

[0005] However, in the actual implementation of the existing technologies for achieving demisting by the Venturi tube principle, including the above-mentioned technical solutions, it was found that there was generally insufficient negative pressure in the throat of the Venturi tube. Therefore, when the oil and gas are subsequently separated by the oil-gas separator, it is difficult to achieve the required gas pressure in the oil-gas separator, thereby affecting the oil removal effect. Some oil droplets still remain in the exhausted gas, which still causes environmental pollution to a certain extent. Utility Model Content

[0006] The technical problem to be solved by the utility model is: to overcome the shortcomings of the prior art and to provide a demisting system for oil mist by arranging a negative pressure device at the outlet of the oil-gas separator, superimposing the negative pressure formed by the negative pressure device and the air pressure at the inlet of the oil-gas separator, thereby increasing the air pressure of the oil-gas mixture in the oil-gas separator, so as to gather the micro oil droplets in the gas-liquid mixture by the filter element, thereby ensuring the separation effect.

[0007] The technical solution adopted by the utility model to solve the technical problem is: the demisting system of the oil mist comprises a venturi injector, the material inlet of the venturi injector is connected to the oil tank through a pipeline, the main air intake pipe is connected to the power gas inlet of the venturi injector, the outlet of the venturi injector is connected to the inlet of the oil-gas separator, and the utility model is characterized in that: a negative pressure device for forming a negative pressure at the outlet of the oil-gas separator is arranged at the outlet of the oil-gas separator.

[0008] Preferably, the negative pressure device is a pneumatic conveying system, the outlet of the oil-gas separator is connected to the feed inlet of the pneumatic conveying system, and the main air inlet pipe is connected to the power air inlet of the pneumatic conveying system.

[0009] Preferably, at least one coalescing filter element is installed at the outlet of the oil-gas separator, and an exhaust pipe is installed at the outlet of the coalescing filter element.

[0010] Preferably, a shell is provided, and the venturi ejector, the oil-gas separator, and the pneumatic conveying system are all located inside the shell.

[0011] Preferably, an inlet temperature gauge and a vacuum gauge are installed on the pipeline between the Venturi ejector and the oil tank; and an outlet temperature gauge is installed on the pipeline between the Venturi ejector and the oil-gas separator.

[0012] Preferably, a pressure gauge and a flow meter are provided on the section where the main air intake pipe is connected to the Venturi injector.

[0013] Preferably, an air compressor is provided, one end of the main air inlet pipe is connected to the air outlet of the air compressor, and the other end is divided into two paths: a first air inlet pipe and a second air inlet pipe, the first air inlet pipe is connected to the Venturi ejector, and the second air inlet pipe is connected to the pneumatic conveying system.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] In the oil mist demisting system, a negative pressure device is arranged at the outlet of the oil-gas separator. The negative pressure there acts in the opposite direction on the oil-gas separator and is superimposed with the air pressure at the inlet of the oil-gas separator, thereby increasing the air pressure of the oil-gas mixture in the oil-gas separator so as to gather the micro oil droplets in the gas-liquid mixture by the filter element and ensure the separation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the oil mist demisting system structure.

[0017] Figure 2 This is a schematic diagram of the oil mist demisting system flow chart.

[0018] Among them: 1. exhaust pipe 2. shell 3. coalescing filter element 4. pneumatic conveying system 5. oil-gas separator 6. venturi ejector 7. outlet temperature gauge 8. oil tank 9. inlet temperature gauge 10. vacuum gauge 11. pressure gauge 12. flow meter 13. first air intake pipe 14. main air intake pipe 15. second air intake pipe 16. air compressor. DETAILED DESCRIPTION

[0019] Figure 1~2 It is the best embodiment of the utility model, and the following Figure 1~2 The utility model is further described.

[0020] like Figure 1 As shown, an oil mist demisting system (hereinafter referred to as demisting system) includes a housing 2, and an oil tank 8 is fixed at the bottom of the housing 2. An oil-gas separator 5 is arranged in the housing 2, and a venturi ejector 6 is arranged at the inlet of the oil-gas separator 5. The material inlet of the venturi ejector 6 extends to the bottom of the housing 2 through a pipeline, and the pipeline enters the oil tank 8 after penetrating the housing 2. On the connecting pipeline between the venturi ejector 6 and the oil tank 8, an inlet temperature gauge 9 and a vacuum gauge 10 are installed in sequence.

[0021] The outlet of the venturi ejector 6 is connected to the inlet of the oil-gas separator 5, and an opening (not shown) is provided on the surface of the housing 2 at a position corresponding to the oil-gas separator 5, so as to enter the housing 2 at a regular time to collect the oil separated by the oil-gas separator 5. An outlet temperature gauge 7 is provided on the connecting pipeline between the venturi ejector 6 and the oil-gas separator 5, and the outlet temperature gauge 7 and the above-mentioned inlet temperature gauge 9 and vacuum gauge 10 simultaneously pass through the housing 2 and extend to the outside of the housing 2, so as to monitor their corresponding monitoring values.

[0022] A pneumatic conveying system 4 is provided at the outlet of the oil-gas separator 5 , and the outlet of the oil-gas separator 5 is connected to the feed port of the pneumatic conveying system 4 . The pneumatic conveying system 4 is implemented by a structure known in the art, and its specific structure and principle are not described in detail here.

[0023] A main air intake pipe 14 is arranged outside the housing 2, and the main air intake pipe 14 is divided into a first air intake pipe 13 and a second air intake pipe 15, and the first air intake pipe 13 and the second air intake pipe 15 respectively penetrate the housing 2 and enter the interior of the housing 2. The first air intake pipe 13 is connected to the power gas inlet of the venturi ejector 6 after entering the housing 2, and the second air intake pipe 15 is connected to the power gas inlet of the pneumatic conveying system 4 after entering the housing 2. A pressure gauge 11 and a flow meter 12 are installed on the first air intake pipe 13, and the pressure gauge 11 and the flow meter 12 are both located outside the housing 2.

[0024] Two coalescing filter elements 3 are simultaneously connected to the discharge port of the pneumatic conveying system 4, and the outlets of the two coalescing filter elements 3 are respectively led out of the housing 2 and respectively connected to the exhaust pipe 1. The pneumatic conveying system 4 can also be implemented by a Venturi ejector.

[0025] The specific working process and working principle are as follows:

[0026] Combination Figure 2 The main air intake pipe 14 is led out from the air compressor 16 and is divided into two paths: one path is connected to the Venturi ejector 6 through the first air intake pipe 13, and the other path is connected to the pneumatic conveying system 4 through the second air intake pipe 15.

[0027] The negative pressure generated in the venturi ejector 6 is used to draw the oil mist in the oil tank 8 into the interior thereof. Inside the venturi ejector 6, the oil mist is mixed with the power wind sent in by the first air inlet pipe 13, cooled and output, and the oil mist will condense and increase its particle size after cooling.

[0028] The oil-gas mixture output from the venturi ejector is passed into the oil-gas separator 5, and the outlet of the oil-gas separator 5 is connected to the suction port of the pneumatic conveying system 4. After the oil-gas mixture is separated in the oil-gas separator 5, only gas is discharged. The power gas fed in by the second air inlet pipe 15 and the gas output from the oil-gas separator 5 are mixed and cooled for a second time in the pneumatic conveying system 4, and the power gas fed in by the second air inlet pipe 15 forms a negative pressure at the suction port of the pneumatic conveying system 4. The negative pressure there acts in reverse on the oil-gas separator 5 and is superimposed on the air pressure at the inlet of the oil-gas separator 5, thereby increasing the air pressure of the oil-gas mixture in the oil-gas separator 5, so that the aggregation filter element can collect the micro oil droplets in the gas-liquid mixture, thereby ensuring the separation effect. The gas output from the pneumatic conveying system 4 is discharged into the atmosphere after passing through the coalescing filter element 3.

[0029] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. An oil mist demisting system, comprising a venturi ejector (6), wherein a material inlet of the venturi ejector (6) is connected to an oil tank (8) through a pipeline, a main air intake pipe (14) is connected to a power air inlet of the venturi ejector (6), and an outlet of the venturi ejector (6) is connected to an inlet of an oil-gas separator (5), characterized in that: A negative pressure device is provided at the outlet of the oil-gas separator (5) for forming a negative pressure at the outlet of the oil-gas separator (5); The negative pressure device is a pneumatic conveying system (4), the outlet of the oil-gas separator (5) is connected to the feed inlet of the pneumatic conveying system (4), and the main air inlet pipe (14) is connected to the power air inlet of the pneumatic conveying system (4); An air compressor (16) is provided, one end of a main air intake pipe (14) is connected to an air outlet of the air compressor (16), and the other end is divided into two paths: a first air intake pipe (13) and a second air intake pipe (15), the first air intake pipe (13) is connected to a Venturi ejector (6), and the second air intake pipe (15) is connected to a pneumatic conveying system (4).

2. The oil mist demisting system according to claim 1, characterized in that: At least one coalescence filter element (3) is installed at the outlet of the oil-gas separator (5), and an exhaust pipe (1) is installed at the outlet of the coalescence filter element (3).

3. The oil mist demisting system according to claim 2, characterized in that: A housing (2) is provided, and a Venturi ejector (6), an oil-gas separator (5), and a pneumatic conveying system (4) are all located inside the housing (2).

4. The oil mist demisting system according to claim 1, characterized in that: An inlet temperature gauge (9) and a vacuum gauge (10) are installed on the pipeline between the Venturi ejector (6) and the oil tank (8); and an outlet temperature gauge (7) is installed on the pipeline between the Venturi ejector (6) and the oil-gas separator (5).

5. The oil mist demisting system according to claim 1, characterized in that: A pressure gauge (11) and a flow meter (12) are provided on the section of the main air intake pipe (14) connected to the Venturi ejector (6).

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