Condensing type unit oil mist removing system

Abstract

The condensation type unit oil mist removing system comprises a bearing, the bearing is located in an inner cavity of a unit, the inner cavity of the unit is communicated with an air inlet pipeline, a negative pressure generator is arranged on the air inlet pipeline, the air inlet pipeline is communicated with a hot end channel of an oil mist condenser, and the hot end channel of the oil mist condenser is communicated with an exhaust pipeline. The system has the beneficial effects that the pressure distribution in the guide bearing of the water-turbine generator set is changed through the large-flow fan or air pump, so that oil gas cannot flow to the contact type sealing position of the guide bearing, and the problem of oil mist overflow is fundamentally solved.

Description

Technical Field

[0001] This application belongs to the technical field of the operation and maintenance of bearings in hydro-generating units, and particularly relates to an oil mist removal system for condensing units. Background Art

[0002] During the operation of the thrust bearing of a hydro-generating unit, the generator shaft drives the thrust head and the mirror plate to rotate at high speed. During the movement of the above-mentioned components, the oil inside the thrust bearing will be stirred at high speed, thus generating a large amount of oil mist. Currently, contact seals and other structures are mainly used at the oil mist outlet of the thrust bearing of hydro-generating units. During the process of contact sealing and shaft friction, due to the influence of shaft out-of-roundness, it is easy to wear. After wear, gaps will be formed on the sealing surface, resulting in easy overflow of oil mist. After the oil mist overflows from the thrust bearing, it will condense on the stator bars and rotor poles, and the oil stains will cause the stator and rotor to adsorb a large amount of dust, further reducing the cooling effect of the stator bars. A large amount of oil mist will also reduce the insulation of the bars, thereby threatening the safety of the stator of the unit.

[0003] All in all, the existing technology has the following disadvantages: 1. Due to the large diameter of the generator shaft of the hydro-generating unit, after long-term operation, due to the influence of rust, impact, friction, etc., there is inevitable out-of-roundness, which affects the sealing tightness; 2. Contact seals often use polymer or graphite materials, and have large wear after long-term operation, resulting in gaps at the sealing place, and oil mist will leak out along the gaps; 3. Due to structural limitations, contact seals cannot be a whole, but are composed of multiple pieces spliced together, resulting in various uneven forces and splicing gaps at the splicing place, affecting the sealing effect. Summary of the Utility Model

[0004] The purpose of this application is to provide an oil mist removal system for condensing units, which solves the problem of oil mist overflow in existing units.

[0005] The purpose of this application is achieved through the following technical solutions:

[0006] An oil mist removal system for condensing units includes a bearing located inside the unit cavity. The unit cavity is connected to an intake pipe, and a negative pressure generator is provided on the intake pipe. The intake pipe is connected to the hot end passage of an oil mist condenser, and the hot end passage of the oil mist condenser is connected to an exhaust pipe.

[0007] Further, the bearing is a thrust bearing, and the unit cavity is the cavity of a hydro-generating unit.

[0008] Further, the thrust bearing is arranged on the rotor shaft, the rotor shaft is connected to the rotor, and a stator is provided outside the rotor.

[0009] Further, the intake pipe is connected to several directions inside the unit cavity.

[0010] Further, the negative pressure generator is a blower or an air pump.

[0011] Further, the hot-end passage of the oil mist condenser is a multi-tube capillary structure; the cold-end passage of the oil mist condenser is a cold air passage, and the cold-end passage communicates with the atmosphere.

[0012] Further, the intake pipe is spirally wound around the outside of the exhaust pipe, and / or the exhaust pipe is spirally wound around the outside of the intake pipe.

[0013] Further, the oil mist condenser is arranged outside the air cooler, or the oil mist condenser is integrally provided with the air cooler.

[0014] Further, the exhaust port of the hot-end passage of the oil mist condenser is located at the bottom, and the exhaust port of the hot-end passage communicates with the downward exhaust pipe, and the exhaust port of the exhaust pipe extends into the oil collector.

[0015] Further, an oil filtering material is provided in the oil collector at the exhaust port of the exhaust pipe.

[0016] Further, the oil filtering material is absorbent cotton.

[0017] Principle of this application:

[0018] 1. Principle of preventing oil mist from overflowing. After the unit oil mist enters the system through the intake pipeline, due to the negative pressure, the flow rate of the oil and gas pipeline entering the contact seal is small, so that the oil mist overflow effect can be quickly reduced.

[0019] 2. Principle of oil and gas condensation. There are two reasons for the generation of oil mist inside the guide bearing. One is that the turbine oil of the water turbine generator unit is easily agitated during the operation of the unit, resulting in the generation of oil mist; the other is that high temperature is generated during the operation of the unit, and the high temperature causes the oil mist to volatilize more easily. When the oil mist at a higher temperature enters the condensation device, its temperature will quickly drop under the action of cold air, and then condense into a liquid and flow down along the pipeline.

[0020] 3. Oil and gas separation. When the condensed oil liquid flows down along the pipeline, since the weight of the liquid is significantly higher than that of the gas, the liquid is located at the lower part of the pipeline, and the liquid and gas can be separated by the liquid collector at the lower part of the pipeline.

[0021] 4. Absorption of residual oil mist. An oil mist collector is provided at the outlet of the oil mist collector. In addition to collecting the oil liquid, this collector also mainly serves as an outflow channel for the gas. At the end of this channel, an oil mist absorption device such as absorbent cotton for oil mist is provided to further remove the oil mist in the gas and ensure the environmental cleanliness.

[0022] Advantages of this application:

[0023] 1. The system changes the pressure distribution inside the thrust bearing of the hydro-generator set through a large-flow fan or air pump, preventing the oil and gas from flowing towards the contact seal of the thrust bearing, and fundamentally solving the problem of oil mist overflow.

[0024] 2. The system mainly consists of pipelines, fans, condensers, etc., all of which are equipment with high reliability and have no wear problems of contact seals, thus having a long service life.

[0025] 3. The condenser of the system utilizes the existing device of the air cooler of the hydro-generator set. The cold air coming out of the air cooler can directly cool the oil mist, and the whole device has a simple structure and is easy to install.

[0026] 4. The system mainly consists of pipelines, etc., and can be flexibly arranged according to the characteristics of the unit, further expanding the application direction of the system.

[0027] 5. The temperature at the outlet of the system pipeline can be monitored in real time, and the fan flow rate can be adjusted according to the actual operating conditions, thereby adjusting the flow rate of the oil mist and gas in the system, changing the passing time of the oil mist in the condensation device, making the outlet gas reach the optimal temperature, and maximizing the effect of removing the oil mist.

[0028] 6. The oil mist collector at the outlet of the system uses materials such as oil-absorbing cotton to further remove the oil mist in the finally discharged gas.

[0029] 7. The main devices of the system are made of stainless steel materials, running safely and reliably with a long service life.

[0030] 8. The main circulating medium in the system is gas, without cooling media such as high-pressure water, avoiding the danger of cooling water leakage into the unit and ensuring the safety of the unit.

[0031] The main solution of the present application and its various further alternative solutions can be freely combined to form multiple solutions, all of which are solutions that can be adopted and claimed in the present application; and in the present application, (each non-conflicting alternative) alternatives can be freely combined with each other and with other alternatives. Those skilled in the art can understand that there are various combinations according to the prior art and common general knowledge after understanding this solution, all of which are the technical solutions to be protected in the present application and will not be enumerated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of the present application.

[0033] In the figure: 1 - rotor, 2 - stator, 3 - bearing, 4 - inner cavity of the unit, 5 - intake pipeline, 6 - negative pressure generator, 7 - oil mist condenser, 8 - exhaust pipeline, 9 - air cooler, 10 - oil collector. DETAILED DESCRIPTION OF THE INVENTION

[0034] The present application will be further described below in conjunction with specific embodiments and the accompanying drawings.

[0035] Referring to Figure 1 As shown, an oil mist removal system for a condensing unit includes a rotor 1, a stator 2, a rotor shaft, bearings 3, a unit inner cavity 4, an intake pipe 5, a negative pressure generator 6, an oil mist condenser 7, an exhaust pipe 8, an air cooler 9, an oil collector 10, and tourism materials. This system is applicable to hydro-generator sets and can also be applicable to other rotating units with bearings.

[0036] For a hydro-generator set, the unit inner cavity 4 is the inner cavity of the hydro-generator set, the bearing 3 is a thrust bearing, the thrust bearing 3 is arranged on the rotor shaft, the rotor shaft is connected to the rotor 1, and the stator 2 is arranged outside the rotor 1. The bearing 3 is located inside the unit inner cavity 4, so the oil mist generated by the rotation of the bearing 3 is inside the unit inner cavity 4.

[0037] The unit inner cavity 4 is communicated with the intake pipe 5, and a negative pressure generator 6 is arranged on the intake pipe 5. The negative pressure generator 6 is a fan or an air pump, and the negative pressure generator is used to generate negative pressure. Under the suction of the negative pressure generator, the oil mist during the operation of the unit will enter the oil mist condenser along the intake pipe.

[0038] There are several intake ports of the intake pipe 5, which are evenly distributed and communicated with several directions of the unit inner cavity 4, so as to ensure that the oil mist in the unit inner cavity 4 can be fully discharged, preventing the oil and gas from flowing towards the contact seal of the thrust bearing, and fundamentally solving the problem of oil mist overflow.

[0039] The intake pipe 5 is communicated with the hot end passage of the oil mist condenser 7 (condenser), and the hot end passage of the oil mist condenser 7 is communicated with the exhaust pipe 8. The oil mist is cooled when it enters the condenser, and the oil in the oil mist condenses, while the purified air is discharged into the atmosphere through the exhaust pipe.

[0040] The hot end passage of the oil mist condenser 7 is a multi-tube capillary structure (formed by sintering process to form more capillary channels). The capillary tubes increase the heat exchange area between the hot end and the cold end, ensuring the heat exchange effect and enabling the oil in the oil mist to be fully condensed. The cold end passage of the oil mist condenser 7 is a cold air passage, which is communicated with the atmosphere, that is, cold air or air is used as the cooling medium to cool the oil mist, which is safe and reliable.

[0041] The air cooler 9 is an air cooler, which is an existing device of the hydro-generator set. The oil mist condenser 7 is arranged outside the air cooler 9, so the condenser can utilize the cold air outside the air cooler 9. Or the oil mist condenser 7 and the air cooler 9 are integrally arranged, and the condenser directly utilizes the cold air of the air cooler 9 itself.

[0042] The exhaust port of the hot end passage of the oil mist condenser 7 is located at the bottom. The oil liquid condensed in the condenser converges at the bottom and then flows out of the condenser through the exhaust port. The exhaust port of the hot end passage is connected to the downward exhaust pipe 8, and the exhaust port of the exhaust pipe 8 extends into the oil collector 10.

[0043] The intake pipe 5 is spirally wound around the outside of the exhaust pipe 8, and / or the exhaust pipe 8 is spirally wound around the outside of the intake pipe 5. Through the mutual winding arrangement between the intake pipe 5 and the exhaust pipe 8, heat transfer between the two pipes is achieved. Since the oil mist in the intake pipe 5 has a temperature but needs to be cooled, and the air in the exhaust pipe 8 has cold energy, the cold air after passing through the oil mist condenser is used to pre-cool the oil mist in the intake pipe 5 in advance, realizing full utilization of cold energy and improving the condensation effect of the oil mist in the condenser. At the same time, the oil mist heats the exhaust pipe 8 through the intake pipe 5, ensuring that the exhaust pipe 8 has a certain temperature, which is conducive to the downward flow of the oil liquid and avoids a large amount of condensed oil liquid adhering to the pipe wall, causing pipe blockage.

[0044] After the oil mist of the thrust bearing enters the condenser, the cold air blown out from the air cooler will cool the oil mist, causing the oil mist in the pipeline to condense into oil liquid, and then flowing into the oil collector along the exhaust pipe, thus completing the collection of the oil mist of the thrust bearing of the hydro-generator unit.

[0045] The oil collector 10 is a cylindrical structure with an upper opening and is used to collect oil liquid. A filter material is provided in the oil collector 10 at the exhaust port of the exhaust pipe 8. The filter material is absorbent cotton, which can further remove the oil mist in the finally discharged gas.

[0046] Key points of this application:

[0047] 1. This system uses condensation to remove the oil liquid in the oil and gas of the thrust bearing of the hydro-generator unit, with high condensation efficiency, avoiding the single method of only sealing the oil mist in the original system, and significantly improving the effect.

[0048] 2. This system uses the cold air of the air cooler as the cooling medium, with good condensation effect. It does not use cooling water for cooling, avoiding the risk of cooling water leakage and ensuring the safety of the unit.

[0049] 3. This system has a flexible layout through a reasonable structural layout.

[0050] The foregoing basic examples of this application and their respective further alternative examples can be freely combined to form multiple embodiments, all of which are embodiments that can be adopted and claimed in this application. In the solution of this application, any alternative example can be arbitrarily combined with any basic example and alternative example.

[0051] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included within the protection scope of the present application.

Claims

1. A de-oiling system for a condensing unit, comprising a bearing (3), the bearing (3) being located in an inner cavity (4) of the unit, and characterized in that: The inner cavity (4) of the unit is in communication with an air intake pipe (5), a negative pressure generator (6) is provided on the air intake pipe (5), the air intake pipe (5) is in communication with a hot end passage of an oil mist condenser (7), and the hot end passage of the oil mist condenser (7) is in communication with an exhaust pipe (8).

2. The oil mist removal system for condensing units according to claim 1, characterized in that: The bearing (3) is a derivation bearing, and the unit inner cavity (4) is the inner cavity of a hydro-generator unit.

3. The oil mist removal system for a condensing unit according to claim 1 or 2, characterized in that: The bearing (3) is arranged on the rotor shaft, the rotor shaft is connected to the rotor (1), and a stator (2) is arranged on the outside of the rotor (1).

4. The oil mist removal system for a condensing unit according to claim 1, characterized in that: The air intake pipe (5) is connected to the inner cavity (4) of the unit in several directions.

5. The oil mist removal system for a condensing unit according to claim 1 or 4, characterized in that: The negative pressure generator (6) is a fan or an air pump.

6. The oil mist removal system for a condensing unit according to claim 1, characterized in that: The hot end passage of the oil mist condenser (7) is a multi-tube capillary structure; the cold end passage of the oil mist condenser (7) is a cold air passage, and the cold end passage is connected to the atmosphere.

7. The oil mist removal system for a condensing unit according to claim 1, characterized in that: The air intake pipe (5) is spirally wound around the outside of the exhaust pipe (8), and / or the exhaust pipe (8) is spirally wound around the outside of the air intake pipe (5).

8. The oil mist removal system for a condensing unit according to claim 1, characterized in that: The oil mist condenser (7) is arranged outside the air cooler (9), or the oil mist condenser (7) and the air cooler (9) are arranged integrally.

9. The oil mist removal system for a condensing unit according to claim 1, characterized in that: The exhaust port of the hot end passage of the oil mist condenser (7) is located at the bottom, and the exhaust port of the hot end passage is connected to the downward exhaust pipe (8), and the exhaust port of the exhaust pipe (8) extends into the oil collector (10).

10. The oil mist removal system for a condensing unit according to claim 9, characterized in that: The oil collector (10) is provided with an oil filter material located at the exhaust port of the exhaust pipe (8); the oil filter material is oil-absorbing cotton.

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