Carbon deposition prevention oil shield of steam turbine

Abstract

The utility model relates to a steam turbine carbon deposition prevention oil catch, and belongs to the technical field of steam turbine equipment. According to the technical scheme, compressed air pipelines are arranged between a compressed air source and an inlet of an electric heater and between an outlet of the electric heater and an oil retainer, and the compressed air pipelines at the outlet of the electric heater are divided into two paths which are connected with middle cavities of the oil retainer at the front position and the rear position of a bearing box respectively; the ball valve is arranged on the compressed air pipeline at the inlet of the electric heater, and the two needle valves are respectively arranged on the two compressed air pipelines connected with the oil retainer at the front position and the rear position of the bearing box. The oil retainer has the advantages that compressed air is controlled to slightly leak from the oil retainer by introducing the compressed air into the middle cavity of the oil retainer, oil leakage at the joint of a rotor of a bearing box on the high-temperature side of a steam turbine and the bearing box is prevented, and meanwhile the phenomenon of carbon deposition caused by gathering of impurities in smoke and ambient air at the oil retainer is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of anti-carbon oil baffle of steam turbine, belong to steam turbine equipment technical field. BACKGROUND

[0002] In the operation process of steam turbine, oil mist is generated in bearing box due to the agitation of lubricating oil, and invades the whole bearing box. At the same time, due to the effect of oil tank smoke extractor, the inside of bearing box is in a state of micro-negative pressure, and the ambient air will enter the bearing box through the gap between the tooth-shaped plate of oil baffle ring and the shaft. The tiny impurity particles carried by the air will adhere to the surface of tooth-shaped plate and form sludge with the lubricating oil at this place, and carbonization will occur in high temperature environment. With the continuous accumulation and hardening of time, the carbon deposition in the bearing box oil baffle will continue to increase. The gap between the oil baffle and the steam turbine rotor will continue to decrease when carbon deposition occurs, which may cause rubbing, increase the vibration of the rotor, and in severe cases, the local part of the rotor will be overheated and deformed, thereby causing imbalance in quality, aggravating the vibration of the shaft system, and seriously affecting the safe operation of the unit. SUMMARY

[0003] The utility model aims at providing a kind of anti-carbon oil baffle of steam turbine, by the compressed air is introduced into the middle chamber of oil baffle ring, control compressed air slightly leaks from oil baffle ring, prevent the rotor of steam turbine high temperature side bearing box and the leakage of bearing box junction, simultaneously avoid the carbon deposition phenomenon that appears at oil baffle ring due to flue gas and impurity in ambient air, solve the above problems existing in background art.

[0004] The technical scheme of the utility model is as follows: an anti-carbon oil baffle of steam turbine, comprising an oil baffle ring, a needle valve, a ball valve, an electric heater, an electrical cabinet, a DCS cabinet, an electric heater inlet and outlet thermometer, an electric heater internal thermometer and a compressed air pipeline, the compressed air pipeline is arranged between the compressed air source and the inlet of the electric heater and between the outlet of the electric heater and the oil baffle ring, the compressed air pipeline at the outlet of the electric heater is divided into two paths and connected to the middle chamber of the oil baffle ring at the front and rear positions of the bearing box respectively; the ball valve is arranged on the compressed air pipeline at the inlet of the electric heater, and the needle valve has two, which are arranged on the two compressed air pipelines connected to the oil baffle ring at the front and rear positions of the bearing box respectively; the electric heater inlet and outlet thermometer has two, which are arranged on the compressed air pipelines at the inlet and outlet of the electric heater respectively, and the electric heater internal thermometer is arranged in the middle of the electric heater; the electric heater inlet and outlet thermometer and the electric heater internal thermometer are connected to the input end of the electrical cabinet, the output end of the electrical cabinet is connected to the needle valve, the ball valve and the electric heater respectively, and the electrical cabinet is connected to the DCS cabinet.

[0005] The specifications of the needle valve, the ball valve and the compressed air pipeline are DN25, and the materials are stainless steel; the connection mode of the needle valve, the ball valve and the compressed air pipeline is screw connection.

[0006] The maximum output power of the electric heater and the electric cabinet is 5KW, and the power supply is 220V mains.

[0007] The compressed air pipeline is connected with the oil retaining ring through threads.

[0008] The compressed air source pressure is 0.5MPa.

[0009] The beneficial effect of the utility model is: through the compressed air into the middle chamber of the oil retaining ring, control the compressed air from the oil retaining ring slight leakage, prevent the turbine high temperature side bearing box rotor and bearing box joint leakage, avoid the carbon deposition phenomenon of the oil retaining ring place because of the flue gas and environmental air impurities gathering. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is the whole structure schematic view of the utility model;

[0011] In the drawing: oil retaining ring 1, needle valve 2, ball valve 3, electric heater 4, electric cabinet 5, DCS cabinet 6, electric heater inlet and outlet thermometer 7, electric heater internal thermometer 8, compressed air pipeline 9, compressed air source 10, power supply incoming line 11. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical scheme and advantages of the utility model embodiment clearer, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings in the embodiment, obviously, the embodiment expressed is a part of the utility model embodiments, not all the embodiments, and all other embodiments obtained by the ordinary skilled in the art based on the embodiment in the utility model without creative labor belong to the protection scope of the utility model.

[0013] The oil baffle of the steam turbine is provided with an oil baffle ring 1, a needle valve 2, a ball valve 3, an electric heater 4, an electric cabinet 5, a DCS cabinet 6, an electric heater inlet and outlet temperature gauge 7, an electric heater internal temperature gauge 8 and a compressed air pipeline 9. The compressed air pipeline 9 is arranged between a compressed air source 10 and the inlet of the electric heater 4 and between the outlet of the electric heater 4 and the oil baffle ring 1. The compressed air pipeline 9 at the outlet of the electric heater 4 is divided into two branches and connected to the middle chamber of the oil baffle ring 1 at the front and rear positions of the bearing box. The ball valve 3 is arranged on the compressed air pipeline 9 at the inlet of the electric heater 4. The needle valve 2 is arranged on the compressed air pipeline 9 at the front and rear positions of the bearing box. The electric heater inlet and outlet temperature gauge 7 is arranged on the compressed air pipeline 9 at the inlet and outlet of the electric heater 4. The electric heater internal temperature gauge 8 is arranged in the middle of the electric heater 4. The electric heater inlet and outlet temperature gauge 7 and the electric heater internal temperature gauge 8 are connected to the input end of the electric cabinet 5. The output end of the electric cabinet 5 is connected to the needle valve 2, the ball valve 3 and the electric heater 4. The electric cabinet 5 is connected to the DCS cabinet 6.

[0014] The needle valve 2, the ball valve 3 and the compressed air pipeline 9 are DN25 in size and made of stainless steel. The needle valve 2 and the ball valve 3 are connected to the compressed air pipeline 9 by screwing.

[0015] The maximum output power of the electric heater 4 and the electric cabinet 5 is 5KW. The power supply is 220V mains.

[0016] The compressed air pipeline 9 is connected to the oil baffle ring 1 by screwing.

[0017] The pressure of the compressed air source 10 is 0.5MPa.

[0018] In actual application, the compressed air is sent into the middle chamber of the oil baffle ring 1. The compressed air diffuses from the toothed plate of the oil baffle ring and the shaft gap in the axial direction to prevent the oil fume and the ambient air from entering the oil baffle ring. The ball valve 3 and the needle valve 2 constitute a compressed air adjusting and isolating device. The ball valve 3 is closed to cut off the compressed air source. The opening of the needle valve 2 is adjusted to control the flow of the compressed air. In this way, the compressed air slightly leaks from the oil baffle ring 1 to achieve the effect of isolating the oil fume and the ambient air and to avoid unnecessary waste of the compressed air. The compressed air is heated by the electric heater 4 before entering the oil baffle ring 1. The temperature of the compressed air is measured by the electric heater inlet and outlet temperature gauge 7 and transmitted to the electric cabinet 5. The output power of the electric heater is controlled by the DCS cabinet 6 to stabilize the air temperature between 70-90℃ to avoid the dynamic friction between the rotor and the oil baffle ring caused by the shrinkage of the toothed plate due to the overcooling of the compressed air sent into the oil baffle ring. The electric heater internal temperature gauge 8 arranged in the middle of the electric heater 4 measures the internal temperature of the electric heater and transmits it to the electric cabinet 5. The output power of the electric heater is controlled by the DCS cabinet 6 to avoid the damage of the electric heater caused by overtemperature.

[0019] When the steam turbine is in normal operation, the ball valve 3 is in full open state, and the electric heater 4 is put into operation. The opening of the needle valve 2 is adjusted to have slight air overflow at the oil baffle 1, and the power of the electric heater 4 is adjusted to have the outlet temperature between 70-90℃.

[0020] When the steam turbine is in shutdown, the electric heater 4 is withdrawn. The ball valve 3 is closed after stopping the turning.

[0021] The utility model sends the compressed air of suitable temperature into the inside of oil baffle, uses the needle valve to adjust the air supply, makes the air slightly leak to the outside, so as to achieve the purpose of blocking the oil gas and the ambient air to enter the oil baffle, further prevents the production of carbon deposit, does not change the length of the steam turbine shaft system and the appearance size, and solves the problem of carbon deposit of oil baffle by reforming on the original bearing box.

Claims

1. A steam turbine anti-carbon deposit oil baffle, characterized in that: The device includes an oil baffle ring (1), a needle valve (2), a ball valve (3), an electric heater (4), an electrical cabinet (5), a DCS cabinet (6), inlet and outlet thermometers (7) for the electric heater, an internal thermometer (8) for the electric heater, and a compressed air pipeline (9). The compressed air pipeline (9) is located between the compressed air source (10) and the inlet of the electric heater (4), and between the outlet of the electric heater (4) and the oil baffle ring (1). The compressed air pipeline (9) at the outlet of the electric heater (4) is divided into two paths, which are respectively connected to the middle chamber of the oil baffle ring (1) at the front and rear positions of the bearing housing. The ball valve (3) is located at the compressed air pipeline at the inlet of the electric heater (4). On 9), there are two needle valves (2), which are respectively installed on the two compressed air pipelines (9) connected to the oil baffle rings (1) at the front and rear positions of the bearing housing; there are two electric heater inlet and outlet thermometers (7), which are respectively installed on the compressed air pipelines (9) at the inlet and outlet of the electric heater (4), and the electric heater internal thermometer (8) is installed in the middle of the electric heater (4); the electric heater inlet and outlet thermometers (7) and the electric heater internal thermometer (8) are connected to the input end of the electrical cabinet (5), and the output end of the electrical cabinet (5) is connected to the needle valve (2), the ball valve (3) and the electric heater (4) respectively, and the electrical cabinet (5) is connected to the DCS cabinet (6).

2. The turbine anti-carbon deposit oil baffle according to claim 1, characterized in that: The needle valve (2), ball valve (3) and compressed air pipeline (9) are DN25 and made of stainless steel. The needle valve (2) and ball valve (3) are connected to the compressed air pipeline (9) by threaded connection.

3. The turbine anti-carbon deposit oil baffle according to claim 1, characterized in that: The maximum output power of the electric heater (4) and the electrical cabinet (5) is 5KW, and the power supply is 220V AC mains power.

4. The turbine anti-carbon deposit oil baffle according to claim 1, characterized in that: The compressed air pipe (9) is connected to the oil baffle ring (1) by a thread.

5. The turbine anti-carbon deposit oil baffle according to claim 1, characterized in that: The pressure of the compressed air source (10) is 0.5 MPa.

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