Oil mist purification and recycling control system for steam turbine of diesel hydrogenation device

Abstract

The utility model belongs to the technical field of petrochemical engineering mechanical equipment, and particularly provides a diesel hydrogenation unit steam turbine oil mist purification and recycling control system which comprises an oil mist separator, an oil return cup, a fan, a motor, an oil mist pipeline, an air outlet pipeline, a first oil return pipeline, a bypass pipeline and an outlet pipeline. The problems that in the prior art, the oil mist recycling rate of steam turbine lubricating oil is low, and safety is not high are solved. According to the utility model, the recycling rate is improved, the discharge amount and the economic cost are reduced, the environmental pollution is effectively reduced, and the safety is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of petrochemical machinery and equipment, and particularly relates to a control system for purifying, recycling and utilizing steam turbine oil mist in a diesel hydrogenation unit. Background Technique

[0002] The lubricating oil of the steam turbine in the diesel hydrogenation unit circulates from the large oil tank through the lubricating oil pump to each lubricating point of the unit, and then cools and reduces the temperature of the bearing bush, resulting in an increase in the temperature of the lubricating oil and generating high-point venting of oil mist. This steam turbine does not have an oil mist recovery and utilization system; the oil mist vented at the high point will form an explosive combustible gas group, posing a safety hazard.

[0003] Since the high-temperature oil mist is discharged into the atmosphere, it causes environmental pollution, and the generated condensed liquid lubricating oil is directly discharged into the waste oil system, resulting in waste of lubricating oil and increased cost.

[0004] Chinese Patent with Publication No. CN210674645U discloses a system for separating oil fume at the outlet of the exhaust fan of the main oil tank of a steam turbine, including a first oil fume separator, an oil drainage and recovery pipeline, an exhaust fan outlet pipeline, a small steam turbine main oil tank exhaust fan, an exhaust fan inlet pipeline, a small steam turbine main oil tank, a second oil fume separator, and an exhaust gas tank. An oil fume separator is installed at a suitable position in the exhaust fan outlet pipeline, and an oil drainage and recovery pipeline is installed at the bottom of the installed oil fume separator to the small steam turbine main oil tank. By installing an oil fume separator and an oil liquid recovery pipeline at the outlet of the exhaust fan of the small steam turbine main oil tank, the oil content in the oil mist is recovered, the oil fume emission is reduced, and environmental pollution is reduced. Although this document recovers the oil content in the oil mist, reduces the oil fume emission, and reduces environmental pollution; however, its oil fume separator is a conventional device with low filtration accuracy and low recovery utilization rate; at the same time, when the oil fume separator fails and is not detected, it will cause the oil fume to be unable to be discharged in time, or after in-situ venting, the high-concentration oil mist will increase the risk of explosion. Content of the Utility Model

[0005] The purpose of a control system for purifying, recycling and utilizing steam turbine oil mist in a diesel hydrogenation unit provided by the utility model is to overcome the problems of low oil mist recovery utilization rate and low safety of the lubricating oil of the steam turbine in the prior art.

[0006] Therefore, the utility model provides a control system for purifying, recycling and utilizing steam turbine oil mist in a diesel hydrogenation unit, which includes an oil mist separator, an oil return cup, a fan, a motor, an oil mist pipeline, an air outlet pipeline, a first oil return pipeline, a branch pipeline and an outlet pipeline. The bottom of the oil mist separator is provided with an oil mist inlet and an oil return port, and the upper part of the oil mist separator is provided with an air outlet;

[0007] The oil mist pipeline is connected to the oil mist inlet of the oil mist separator. The air outlet of the oil mist separator is connected to the fan inlet through the air outlet pipeline. The outlet of the fan is connected to the outlet pipeline. The fan is electrically connected to the motor. The oil return port of the oil mist separator is connected to the oil return cup through the first oil return pipeline;

[0008] The first inlet of the bypass pipeline is connected to the oil mist pipeline. The second inlet of the bypass pipeline is connected to the oil mist separator. The outlet of the bypass pipeline is connected to the outlet pipeline.

[0009] Preferably, the oil mist separator includes a housing and a filter body. The filter body is connected inside the middle of the housing.

[0010] Preferably, the filter body includes multiple filter elements. The multiple filter elements are spaced apart. Each filter element is arranged vertically.

[0011] Preferably, the filter element adopts fiberglass filter paper + composite fiber.

[0012] Preferably, a first negative pressure gauge is connected to the oil mist separator. A second negative pressure gauge is connected to the oil mist pipeline.

[0013] Preferably, a bypass valve is connected to the first inlet of the bypass pipeline. A first control valve is connected to the second inlet of the bypass pipeline. An outlet valve is connected to the outlet of the fan. A second control valve is connected to the first oil return pipeline.

[0014] Preferably, a second oil return pipeline is connected between the outlet pipeline and the oil return cup.

[0015] Preferably, the fan adopts an explosion-proof fan, and the motor adopts an explosion-proof motor.

[0016] Preferably, the first control valve is a check valve.

[0017] Preferably, the oil return cup is filled with lubricating oil.

[0018] Advantages of the present utility model:

[0019] 1. For the steam turbine oil mist purification, recovery and utilization control system of the diesel hydrogenation unit provided by the present utility model, the motor drives the fan. The fan sucks the oil mist into the oil mist separator through the oil mist pipeline for gas-liquid separation. The separated gas is discharged through the air outlet pipeline, the fan and the outlet pipeline. The separated liquid enters the oil return cup through the first oil return pipeline for oil recovery, improving the recovery utilization rate, reducing the emissions and economic costs, and effectively reducing environmental pollution; when the oil mist separator fails, the oil mist is discharged through the bypass pipeline and the outlet pipeline, and will not accumulate in the fuel tank or be discharged at the original point, avoiding the formation of explosive combustible gas groups and improving safety.

[0020] 2. The control system for the purification, recovery and utilization of steam turbine oil mist in this diesel hydrogenation unit provided by the utility model. The filter body includes multiple filter elements, which are distributed at intervals, and each filter element is arranged vertically; it can increase the coalescence ability of the equipment, and the operation of replacing the filter element is simple. There is a certain distance between each filter element, so that the coalesced oil can better return to the oil return cup through the first oil return pipeline.

[0021] 3. The control system for the purification, recovery and utilization of steam turbine oil mist in this diesel hydrogenation unit provided by the utility model. The filter element adopts glass fiber filter paper + composite fiber. The sub-micron glass fiber can efficiently capture fine oil mist particles, form large droplets through multi-layer coalescence, and the large droplets are separated by the separation layer and then flow back to the oil return cup under the action of gravity, which is both environmentally friendly and economical. Brief Description of the Drawings

[0022] The following will further describe the present utility model in detail with reference to the drawings.

[0023] Figure 1 It is a schematic diagram of the structural principle of the control system for the purification, recovery and utilization of steam turbine oil mist in the diesel hydrogenation unit;

[0024] Figure 2 It is the front view of the structure of the control system for the purification, recovery and utilization of steam turbine oil mist in the diesel hydrogenation unit;

[0025] Figure 3 It is the top view of the structure of the control system for the purification, recovery and utilization of steam turbine oil mist in the diesel hydrogenation unit;

[0026] Figure 4 It is a schematic diagram of the connection between the oil mist separator and the first oil return pipeline.

[0027] Description of the reference numerals in the drawings: 1. Oil mist separator; 2. Oil return cup; 3. Fan; 4. Motor; 5. Negative pressure gauge 1; 6. Negative pressure gauge 2; 7. Bypass valve; 8. Control valve 1; 9. Outlet valve; 10. Control valve 2; 11. Oil tank; 12. Second oil return pipeline;

[0028] 1.1. Shell; 1.2. Filter body; 1.21. Filter element. Detailed Embodiments

[0029] The principles and features of the present utility model will be described below with reference to the drawings. The examples given are only for explaining the present utility model and are not intended to limit the scope of the present utility model.

[0030] Embodiment 1:

[0031] As Figures 1 - 4As shown in the figure, a control system for the purification, recovery and utilization of steam turbine oil mist in a diesel hydrogenation unit includes an oil mist separator 1, an oil return cup 2, a fan 3, a motor 4, an oil mist pipeline, an air outlet pipeline, a first oil return pipeline, a bypass pipeline and an outlet pipeline. An oil mist inlet and an oil return port are provided at the bottom of the oil mist separator 1, and an air outlet is provided at the upper part of the oil mist separator 1.

[0032] The oil mist pipeline is connected to the oil mist inlet of the oil mist separator 1. The air outlet of the oil mist separator 1 is connected to the inlet of the fan 3 through the air outlet pipeline. The outlet of the fan 3 is connected to the outlet pipeline. The fan 3 is electrically connected to the motor 4. The oil return port of the oil mist separator 1 is connected to the oil return cup 2 through the first oil return pipeline.

[0033] The inlet 1 of the bypass pipeline is connected to the oil mist pipeline, the inlet 2 of the bypass pipeline is connected to the oil mist separator 1, and the outlet of the bypass pipeline is connected to the outlet pipeline.

[0034] Specifically, the air outlet of the oil mist separator is connected to the air inlet of the fan 3. Relying on the suction force of the fan 3, the oil mist is extracted from the oil tank 11. The oil mist enters the oil mist separator 1 through the oil mist pipeline for gas-liquid separation. The separated gas is discharged through the fan 3, and the separated liquid enters the oil return cup 2 through the first oil return pipeline for oil recovery, improving the recovery utilization rate, reducing the emissions and economic costs, and effectively reducing environmental pollution. When the oil mist separator 1 fails, the oil mist is discharged through the bypass pipeline and the outlet pipeline, and will not accumulate in the oil tank or be discharged at the original point, avoiding the formation of explosive combustible gas clusters and improving safety.

[0035] Embodiment 2:

[0036] Based on Embodiment 1, the oil mist separator 1 includes a housing 1.1 and a filter body 1.2. The filter body 1.2 is connected inside the middle of the housing 1.1.

[0037] Specifically, the oil mist enters the oil mist separator 1 through the oil mist pipeline, is filtered by the filter body 1.2, and then undergoes gas-liquid separation by the oil mist separator 1, reducing the impurities in the separated gas and liquid. The discharged gas does not pollute the environment, and the recovered liquid has good purity.

[0038] Preferably, the filter body 1.2 includes a plurality of filter elements 1.21. The plurality of filter elements 1.21 are distributed at intervals, and each filter element 1.21 is arranged vertically.

[0039] Specifically, this setting can increase the coalescence ability of the equipment. The operation of replacing the filter element is simple. There is a certain distance between each filter element, enabling the coalesced oil to better return to the oil return cup 2 through the first oil return pipeline.

[0040] Preferably, the filter element 1.21 is made of fiberglass filter paper + composite fiber.

[0041] Specifically, the filter element 1.21 uses fiberglass filter paper + composite fiber. The sub-micron fiberglass can efficiently capture fine oil mist particles, form large droplets through multi-layer coalescence, and the large droplets are separated by the separation layer and then flow back to the fuel tank under gravity, which is both environmentally friendly and economical.

[0042] Embodiment 3:

[0043] Based on Embodiment 2, a negative pressure gauge 5 is connected to the oil mist separator 1, and a negative pressure gauge 6 is connected to the oil mist pipeline.

[0044] Specifically, the negative pressure gauge 5 facilitates monitoring the negative pressure generated by the fan, and the negative pressure gauge 6 facilitates monitoring the pressure of the fuel tank 11.

[0045] Preferably, a bypass valve 7 is connected to the first inlet of the bypass pipeline, a control valve 8 is connected to the second inlet of the bypass pipeline, an outlet valve 9 is connected to the outlet of the fan 3, and a control valve 10 is connected to the first oil return pipeline.

[0046] Specifically, the bypass valve 7, the control valve 8, the outlet valve 9 and the control valve 10 facilitate controlling the corresponding pipelines, enabling the mist liquid, the separated gas or liquid to follow a predetermined route.

[0047] Preferably, a second oil return pipeline 12 is connected between the outlet pipeline and the oil return cup 2.

[0048] Specifically, the second oil return pipeline can introduce the droplets in the outlet pipeline into the oil return cup 2.

[0049] Preferably, the fan 3 uses an explosion-proof fan, and the motor 4 uses an explosion-proof motor.

[0050] Specifically, using an explosion-proof fan and an explosion-proof motor has better safety.

[0051] Preferably, the control valve 8 is a check valve.

[0052] Specifically, using a check valve avoids the backflow of oil mist.

[0053] Preferably, the oil return cup 2 is filled with lubricating oil.

[0054] Specifically, the oil return cup 2 must be filled with the same type of lubricating oil as required to ensure liquid seal.

[0055] The working principle of the present utility model is as follows:

[0056] The fan 3 operates, the outlet valve 9 is opened, and the bypass valve 7 is fully closed or opened at a certain angle to adjust the negative pressure in the oil tank 11. At this time, the control valve 8 is closed because the pressure at the inlet of the outlet valve 9 is higher than the pressure at the inlet of the bypass valve 7. The oil mist is discharged through the filter element and the fan; the oil mist enters the oil mist separator 1 through the oil mist pipeline for filtration and gas-liquid separation. The separated gas enters the fan 3 through the air outlet pipeline, is discharged by the fan 3 to the outlet pipeline, and is discharged through the outlet pipeline;

[0057] When manual or fault shutdown occurs, since the fan 3 no longer sucks air, at this time, the pressure at the inlet of the bypass valve 7 is greater than the pressure at the inlet of the outlet valve 9, and the control valve 8 is opened. The oil mist is discharged through the bypass pipeline and the outlet pipeline, and the oil mist is directly discharged without passing through the filter element and the fan.

[0058] With the steam turbine oil mist purification, recovery and utilization control system of the diesel hydrogenation unit of the present utility model, the highly efficient separation ability of the oil mist separator enables the separated oil liquid to return to the oil tank, reducing the loss of lubricating oil by more than 90% and saving expenses; the filtration accuracy of the oil mist separator can reach 99.97%. The external exhaust oil smoke at the original high-point vent was visible green smoke to the naked eye. After adopting this system, there is no visible green smoke to the naked eye. The generated oil mist concentration is low and will not form an explosive combustible gas group. The generated condensed lubricating oil is all purified, recovered and utilized, reducing the emissions and effectively reducing environmental pollution.

[0059] In the description of the present utility model, it should be understood that if there are terms such as "upper", "inner", "lower", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for exemplary illustration and cannot be understood as a limitation to the present utility model.

[0060] The above examples are only illustrative of the present utility model and do not constitute a limitation to the protection scope of the present utility model. Any design identical or similar to the present utility model falls within the protection scope of the present utility model.

Claims

1. A diesel hydrotreating unit steam turbine oil mist purification and recycling control system, characterized by: The oil mist separator (1) comprises an oil mist separator (1), an oil return cup (2), a fan (3), a motor (4), an oil mist pipeline, an air outlet pipeline, an oil return pipeline 1, a branch pipeline and an outlet pipeline. The bottom of the oil mist separator (1) is provided with an oil mist inlet and an oil return port, and the upper part of the oil mist separator (1) is provided with an air outlet. The oil mist pipeline is connected to the oil mist inlet of the oil mist separator (1), the air outlet of the oil mist separator (1) is connected to the inlet of the fan (3) through the air outlet pipeline, the outlet of the fan (3) is connected to the outlet pipeline, the fan (3) is electrically connected to the motor (4), and the oil return port of the oil mist separator (1) is connected to the oil return cup (2) through the oil return pipeline. The first inlet of the side branch pipeline is connected to the oil mist pipeline, the second inlet of the side branch pipeline is connected to the oil mist separator (1), and the outlet of the side branch pipeline is connected to the outlet pipeline.

2. The diesel hydrotreating unit steam turbine oil mist purification and recycling control system according to claim 1, characterized in that: The oil mist separator (1) comprises a shell (1.1) and a filter body (1.2), and the filter body (1.2) is connected to the middle part of the shell (1.1).

3. The diesel hydrotreating unit steam turbine oil mist purification and recycling control system according to claim 2, characterized in that: The filter body (1.2) comprises a plurality of filter cores (1.21), the plurality of filter cores (1.21) are distributed at intervals, and each filter core (1.21) is arranged vertically.

4. The diesel hydrotreating unit steam turbine oil mist purification and recycling control system according to claim 1, characterized in that: The oil mist separator (1) is provided with a negative pressure gauge 1 (5) and the oil mist pipeline is provided with a negative pressure gauge 2 (6).

5. The diesel hydrotreating unit steam turbine oil mist purification and recycling control system according to claim 1, characterized in that: The first inlet of the bypass pipeline is connected to a bypass valve (7), the second inlet of the bypass pipeline is connected to a control valve (8), the outlet of the fan (3) is connected to an outlet valve (9), and the first oil return pipeline is connected to a control valve (10).

6. The diesel hydrotreating unit steam turbine oil mist purification and recovery control system according to claim 1, characterized in that: A second oil return pipeline (12) is provided and connected between the outlet pipeline and the oil return cup (2).

7. The diesel hydrotreating unit steam turbine oil mist purification and recovery control system according to claim 1, characterized in that: The fan (3) is an explosion-proof fan, and the motor (4) is an explosion-proof motor.

8. The diesel hydrotreating unit steam turbine oil mist purification and recovery control system according to claim 5, characterized in that: The control valve 1 (8) is a one-way valve.

9. The diesel hydrotreating unit steam turbine oil mist purification and recycling control system according to claim 1, characterized in that: The oil return cup (2) is filled with lubricating oil.

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