Induced draft fan system dragged by steam turbine in power workshop

Abstract

The utility model discloses an induced draft fan system dragged by a steam turbine in a power workshop, and relates to the technical field of energy-saving systems. Comprising a steam turbine; the speed reducer is connected with the steam turbine; the motor is connected with the speed reducer through a clutch; the hydraulic coupler is connected with the motor; and the induced draft fan is connected with the hydraulic coupler. Steam of a power workshop boiler enters the steam turbine and is converted into kinetic energy to drive the speed reducer, the speed reducer drives the motor, the motor drives the induced draft fan, the energy is fully utilized through the steam turbine, and the boiler induced draft fan is dragged to achieve the purposes of energy conservation and consumption reduction.

Description

Technical Field

[0001] The utility model relates to the technical field of energy-saving systems, in particular to a steam turbine driven induced draft fan system for a power workshop. Background Art

[0002] Generally, induced draft fans are driven by electric motors. Since the motors used in induced draft fans are relatively powerful, the starting current of induced draft fans is relatively large, which results in relatively large energy consumption.

[0003] When the power plant boiler is at full load, the deaerator requires about 100T / H of 0.55MPa steam. This steam is taken from the pipeline network (1.0MPa) and sent to the deaerator after being reduced in pressure, resulting in energy loss.

[0004] Therefore, in order to reduce the energy loss of the power plant and the energy consumption of driving the induced draft fan, a power plant steam turbine driven induced draft fan system is urgently needed. Utility Model Content

[0005] In order to solve the existing technical problems, the utility model provides a power workshop steam turbine driven induced draft fan system, comprising:

[0006] Steam turbine;

[0007] A reducer connected to the steam turbine;

[0008] An electric motor connected to the reducer via a clutch;

[0009] A hydraulic coupler connected to the electric motor;

[0010] The induced draft fan is connected with the hydraulic coupling.

[0011] Furthermore, the type of the steam turbine is back pressure type.

[0012] Furthermore, it also includes: a condenser connected to the steam turbine.

[0013] Further,

[0014] Furthermore, the steam turbine and the reducer are connected via a diaphragm coupling.

[0015] Furthermore, the steam turbine is provided with a protection system;

[0016] The protection system comprises: three magnetic speed sensors installed on the front bearing seat of the steam turbine, respectively used to collect three sets of speed signals and send them to the controller;

[0017] The electric actuator is electrically connected to the controller, receives a standard current signal from the controller, outputs a torque, and adjusts the opening of the regulating valve of the steam turbine, thereby adjusting the air intake of the steam turbine.

[0018] Furthermore, it also includes: a lubricating oil station system for simultaneously supplying oil to the main bearing, thrust bearing and reducer bearing of the steam turbine;

[0019] The lubricating oil station system comprises: an oil tank;

[0020] an electric lubricating oil pump connected to the oil tank, and the electric lubricating oil pump is electrically connected to the controller;

[0021] An oil filter connected to an electric lubricating oil pump through a pipeline;

[0022] A cooler is connected to the oil filter through a pipeline.

[0023] Furthermore, a pressure sensor is installed on the pipeline, and the pressure sensor is electrically connected to the controller.

[0024] Furthermore, a temperature sensor is connected to the oil return pipeline connected to the oil tank, and the temperature sensor is electrically connected to the controller.

[0025] Furthermore, the protection system also includes: a first thermal resistor connected to the main bearing and thrust bearing of the steam turbine and a second thermal resistor connected to the reducer bearing, and the first thermal resistor and the second thermal resistor are both electrically connected to the controller.

[0026] The beneficial effects of the technical solution provided by the utility model are as follows: a steam turbine, a reducer, an electric motor, a clutch, a hydraulic coupling and an induced draft fan are arranged in the utility model, the output shaft of the steam turbine is connected to the input shaft of the reducer, the output shaft of the reducer is connected to the input shaft of the electric motor, the output end of the electric motor is connected to the rotor of the induced draft fan, the steam of the boiler in the power workshop enters the steam turbine, is converted into kinetic energy, drives the reducer, the reducer drives the electric motor, the electric motor drives the induced draft fan, and this part of energy is fully utilized by the steam turbine to drive the boiler induced draft fan to achieve the purpose of energy saving and consumption reduction.

[0027] In addition, the output shaft of the reducer is connected to the input shaft of the motor through a clutch. When the turbine system fails and shuts down, the clutch automatically disengages without affecting the original operation of the induced draft fan system. When the speed of the reducer low-speed end is the same as the speed of the induced draft fan motor, the clutch engages and the speeds are synchronized. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural schematic diagram of a steam turbine driven induced draft fan system for a power plant provided by the utility model;

[0029] Figure 2 It is a schematic diagram of a protection system provided by the utility model;

[0030] Figure 3 The utility model is a structural schematic diagram of a water storage tank provided by the utility model.

[0031] Figure markings: 1-steam turbine; 2-reducer; 3-motor; 4-clutch; 5-hydraulic coupling; 6-induced draft fan; 7-condenser; 8-diaphragm coupling; 9-magnetic speed sensor; 10-controller; 11-electric actuator; 12-regulating air valve; 13-oil tank; 14-electric lubricating oil pump; 15-oil filter; 16-cooler; 17-pressure sensor; 18-temperature sensor; 19-first thermal resistor; 20-second thermal resistor; 21-first sound and light alarm; 22-second sound and light alarm; 23-third sound and light alarm; 24-condensate pump; 25-intelligent tachometer; 26-water storage tank; 27-steam baffle. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] It should be noted that in this embodiment, the directions or positional relationships indicated by "bottom", "top", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0035] It should also be noted that, in this embodiment, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] See also Figure 1-Figure 3 A steam turbine driven induced draft fan system for a power workshop includes: a steam turbine 1, a reducer 2, a motor 3, a clutch 4, a hydraulic coupling 5 and an induced draft fan 6. The output shaft of the steam turbine 1 is connected to the input shaft of the reducer 2 through a diaphragm coupling 8, and the output shaft of the reducer 2 is connected to the input end of the motor 3, which can adjust the speed ratio or increase the torque; the output end of the motor 3 is connected to the rotor of the induced draft fan 6 through the hydraulic coupling 5; wherein the model of the diaphragm coupling 8 can be LS5-C68-1519, the model of the hydraulic coupling 5 can be ALFA 60, and the motor 3 can be an asynchronous motor.

[0037] The output shaft of the reducer 2 is connected to the input shaft of the motor 3 through the clutch 4. The clutch 4 can be an overrunning clutch and the model can be XHL-36. When the turbine system fails and shuts down, the clutch 4 is disengaged and the induced draft fan is directly driven to rotate by the motor 3 as a driving mechanism, thereby not affecting the original operation of the induced draft fan system. When the speed of the low-speed end of the reducer 2 is the same as the speed of the induced draft fan motor, the clutch 4 automatically engages and the speed is synchronized; the specification of the reducer 2 is 3700:1000.

[0038] The steam from the power workshop boiler enters the steam turbine 1, is converted into kinetic energy, drives the reducer 2, the reducer 2 drives the motor 3, the motor 3 drives the induced draft fan, and this energy is fully utilized by the steam turbine to drive the boiler induced draft fan to achieve the purpose of energy saving and consumption reduction.

[0039] Furthermore, the type of the steam turbine 1 is a back pressure type. In this embodiment, the model of the steam turbine 1 may be B1.8-1.0 / 0.55.

[0040] The turbine body is mainly composed of the rotor part and the stator part. The rotor part includes the rotor, impeller, blades, coupling, etc. The stator part includes the cylinder, nozzle group, partition, steam seal, bearing, bearing seat, regulating steam valve, etc. The turbine cylinder body is a cast steel part, divided into upper and lower cylinders, of which the upper and lower cylinders are divided into front and rear halves, and the flange surfaces at both ends are connected and fixed together by cylinder bolts; the cylinder aging is carried out through heat treatment, the turbine inlet is at the right end of the front cylinder, and the exhaust port is at the right end of the rear cylinder; the turbine interstage nozzle and partition stator blades are grouped and welded with a belt structure, and finally welded in the nozzle ring groove, and then heat treated after welding and fine processing; the main shaft and impeller of the turbine rotor are respectively heat-treated integral forged alloy steel parts, and the impeller is mounted on the main shaft through hot-fitting technology. Each stage of blades is manually inlaid in the blade root groove of the same impeller, and the last blade of each row is fixed to the impeller by welding.

[0041] Furthermore, a protection system is provided on the steam turbine 1, which includes: three magnetic speed sensors 9 and an electric actuator 11 installed on the front bearing seat of the steam turbine 1, the three magnetic speed sensors 9 are respectively used to collect three groups of speed signals and send them to the controller 10, wherein the model of the controller 10 can be WOODWARD 505 / 505E, the model of the magnetic speed sensor 9 can be SICB-01; the model of the electric actuator 11 can be Siemens F-2SA3032.

[0042] The steam turbine can operate continuously and stably at 30% to 105% of the rated load. The three magnetic speed sensors 9 installed on the front bearing seat of the steam turbine sample the three groups of speed signals and transmit them to three groups of intelligent tachometers (DTZ-C-031S) respectively. The three magnetic speed sensors 9 are electrically connected to the three groups of intelligent tachometers 25 respectively, and the three groups of intelligent tachometers 25 are electrically connected to the controller 10. The electric actuator 11 is electrically connected to the controller 10. The controller 10 compares the speed with the preset speed. When more than two groups indicate overspeed, the controller 10 sends a command to the electric actuator 11. The electric actuator 11 receives the standard current signal of the controller 10, outputs torque, and adjusts the opening of the regulating valve 12 of the steam turbine 1, thereby adjusting the air intake of the steam turbine 1; even if one group of magnetic speed sensors 9 fails, it will not cause the system to malfunction and shut down, causing adverse effects on production.

[0043] Furthermore, the power plant steam turbine driven induced draft fan system also includes: a lubricating oil station system for simultaneously supplying oil to the main bearing, thrust bearing and reducer 2 bearing of the steam turbine 1.

[0044] The lubricating oil station system includes: an oil tank 13, an electric lubricating oil pump 14, an oil filter 15 and a cooler 16. The oil tank 13 can be 1.5 cubic meters. The electric lubricating oil pump 14 is connected to the oil tank 13 through a pipeline. The electric lubricating oil pump 14 is connected to the oil filter 15 and the cooler 16 through a pipeline. The cooler 16 supplies oil to the main bearing, thrust bearing and bearing of the reducer 2 of the steam turbine 1 at the same time through the pipeline. The oil cooler 16 cools the lubricating oil in the pressure oil circuit before entering the key lubrication points to ensure that the oil temperature is appropriate. The oil filter 15 is used to filter impurities in the lubricating oil in the oil circulation path to improve the oil quality.

[0045] In addition, a heating device may be provided in the oil tank 13 to maintain the temperature of the lubricating oil within an appropriate range, ensuring that the lubricating oil can quickly reach the operating temperature at startup and remain stable during the entire operation process to ensure the fluidity of the lubricating oil, the lubricating effect and the safe operation of the equipment.

[0046] The lubricating oil station system can be used to lubricate and cool the main bearing, thrust bearing of the steam turbine 1 and the bearing of the reducer 2.

[0047] Furthermore, a pressure sensor 17 is installed on the pipeline of the lubricating oil station system. The pressure sensor 17, the electric lubricating oil pump 14, and the first sound and light alarm 21 are all electrically connected to the controller 10. The model of the pressure sensor 17 may be MPM388. Under any operating conditions, the normal operating oil pressure is 0.1-0.15 MPa. The pressure sensor 17 detects the pressure data on the pipeline and sends it to the controller 10. When the controller 10 determines that the lubricating oil pressure is lower than 0.08 MPa, the electric lubricating oil pump 14 is controlled to start. When the controller 10 determines that the lubricating oil pressure is lower than 0.05 MPa, a first alarm signal is sent to the first sound and light alarm 21 to alert the staff.

[0048] Furthermore, the oil tank 13 also receives the lubricating oil returning from each lubrication point through the return oil pipeline. Under any operating conditions, the return oil temperature of each bearing does not exceed 65°C. Therefore, a temperature sensor 18 is connected to the return oil pipeline. The model of the temperature sensor 18 can be Kobold TWP. The temperature sensor 18 and the second sound and light alarm 22 are both electrically connected to the controller 10. The temperature sensor 18 monitors the temperature on the return oil pipeline at all times and sends the temperature data to the controller 10. When the controller 10 determines that the temperature data exceeds 65°C, it sends a second alarm signal to the second sound and light alarm 22 to remind the staff.

[0049] Furthermore, the protection system also includes: a first thermal resistor 19 connected to the main bearing and thrust bearing of the turbine 1 and a second thermal resistor 20 on the bearing of the reducer 2. The first thermal resistor 19, the second thermal resistor 20 and the third sound and light alarm 23 are all electrically connected to the controller 10. The first thermal resistor 19 and the second thermal resistor 20 are PT100 graduations and double-branch three-wire systems. The first thermal resistor 19 and the second thermal resistor 20 respectively measure the temperature of the main bearing, thrust bearing and reducer 2 bearing of the turbine 1, and send the temperature measurement data to the controller 10. When the controller 10 determines that the temperature exceeds 85°C, it sends a third alarm signal to the third sound and light alarm 23 to remind the staff.

[0050] Furthermore, the turbine driven induced draft fan system of the power workshop also includes: a condenser 7, a drain port is arranged before and after each stage of the partition of the turbine 1 cylinder, and a high and low pressure drain box is externally provided, and the high and low pressure stage drains are sucked into the condenser through the water seal pipe.

[0051] The condenser is a surface condenser, and the tube bundle is made of stainless steel. The exhaust steam of the turbine 1 is condensed in the condenser 7; the water outlet of the condenser 7 is connected to the water inlet of the water storage tank 26, and the water inlet of the water storage tank 26 is located in the middle; a plurality of steam baffles 27 are connected to the inner wall of the water storage tank 26 and are arranged at an upward angle, and the steam baffles 27 are located above the water inlet of the water storage tank 26, and the water storage cavity is below the water inlet of the water storage tank 26, wherein the inclination angle of the steam baffles 27 is 20 to 45°.

[0052] The condensed water from the condenser 7 enters the water storage tank 26, and the condensed water flows into the water storage chamber below. A small amount of steam still existing in the condensed water is transported upward, blocked by the steam baffle 27, condensed on the steam baffle 27 to become condensed water, and then slides along the steam baffle 27 to the water storage chamber, and the non-condensable gas is discharged from the exhaust port above.

[0053] A float level gauge is provided in the water tank 26. The float level gauge and the condensate pump 24 are electrically connected to the controller 10. The lower limit water level value and the upper limit water level value of the water tank 26 are pre-stored in the controller 10. The water outlet of the water tank 26 is connected to the condensate pump. The controller 10 is electrically connected to the condensate pump. When the water level of the water tank 26 is lower than the lower limit water level, the controller 10 controls the condensate pump to stop working. When the water level of the water tank 26 is higher than the upper limit water level, the controller 10 controls the condensate pump 24 to start and discharge the condensate into the circulating water system of the factory.

[0054] It should be noted that the above-mentioned electrical connection is a connection method for achieving electrical continuity between circuits. It can be by connecting different parts of the circuit through components such as wires, cables, connectors, etc., so that current can flow between them; it can also be wireless, such as electromagnetic waves, radio frequencies, etc., to achieve energy or signal transmission without physical wire connection.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A steam turbine driven induced draft fan system for a power plant, characterized in that: include: Steam turbine (1); A speed reducer (2) connected to the steam turbine (1); An electric motor (3) is connected to the reducer (2) via a clutch (4); A hydraulic coupler (5) connected to the electric motor (3); An induced draft fan (6) connected to the hydraulic coupling (5); The steam turbine (1) is of a back pressure type; a protection system is provided on the steam turbine (1); The protection system comprises: three magnetic speed sensors (9) installed on the front bearing seat of the steam turbine (1), respectively used to collect three groups of speed signals and send them to the controller (10); An electric actuator (11) is electrically connected to the controller (10), and the electric actuator (11) receives a current signal from the controller (10), outputs a torque, and adjusts the opening of the regulating valve (12) of the steam turbine (1), thereby adjusting the air intake of the steam turbine (1).

2. The power plant steam turbine driven induced draft fan system according to claim 1, characterized in that: Also includes: A condenser (7) is connected to the steam turbine (1).

3. The power plant steam turbine driven induced draft fan system according to claim 2, characterized in that: Also includes: Water storage tank (26); The water outlet of the condenser (7) is connected to the water inlet of the water storage tank (26), and the water inlet of the water storage tank (26) is located in the middle; A plurality of steam baffles (27) arranged at an angle are connected to the inner wall of the water storage tank (26), and the steam baffles (27) are located above the water inlet of the water storage tank (26), and a water storage cavity is located below the water inlet of the water storage tank (26).

4. The power plant steam turbine driven induced draft fan system according to claim 1, characterized in that: The steam turbine (1) and the reducer (2) are connected via a diaphragm coupling (8).

5. The power plant steam turbine driven induced draft fan system according to claim 1, characterized in that: It also includes: a lubricating oil station system, used for simultaneously supplying oil to the main bearing, thrust bearing of the steam turbine (1) and the bearing of the reducer (2); The lubricating oil station system comprises: an oil tank (13); An electric lubricating oil pump (14) connected to the oil tank (13), and the electric lubricating oil pump (14) is electrically connected to the controller (10); An oil filter (15) is connected to the electric lubricating oil pump (14) through a pipeline; A cooler (16) is connected to the oil filter (15) through a pipeline.

6. The power plant steam turbine driven induced draft fan system according to claim 5, characterized in that: A pressure sensor (17) is installed on the pipeline, and the pressure sensor (17) is electrically connected to the controller (10).

7. The power plant steam turbine driven induced draft fan system according to claim 6, characterized in that: A temperature sensor (18) is connected to the oil return pipeline connected to the oil tank (13), and the temperature sensor (18) is electrically connected to the controller (10).

8. The power plant steam turbine driven induced draft fan system according to claim 5, characterized in that: The protection system further comprises: a first thermal resistor (19) connected to the main bearing and thrust bearing of the steam turbine (1) and a second thermal resistor (20) connected to the bearing of the reducer (2); the first thermal resistor (19) and the second thermal resistor (20) are both electrically connected to the controller (10).

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