Preheating recovery device for lubricating oil system of steam turbine

Abstract

The utility model provides a steam turbine lubricating oil system preheating recovery device, which relates to the technical field of steam turbines, and comprises a main oil tank, an engine oil refining device, a waste heat oil cooler and a side water replenishing pipeline, an oil return pipeline is connected between an oil return opening of the engine oil refining device and the main oil tank, and an oil inlet and an oil outlet of the waste heat oil cooler are connected with an oil inlet branch pipe and an oil side bypass respectively. According to the waste heat gradient reutilization principle, the steam turbine oil purification device is used for driving lubricating oil to circulate waste heat to heat desalted water and replenish water, heat of oil introduced into the waste heat oil cooler is recycled through water introduced into the waste heat oil cooler, the heat is used for heating and increasing the temperature of the replenished water, and the heat of the oil introduced into the waste heat oil cooler is recycled. The water vapor index performance of a condenser of a follow-up unit is improved, the heat absorption capacity of circulating cooling water of a machine oil cooler of follow-up original equipment is reduced, and the corrosion rate of a circulating water pipeline and scaling of a water valve baffle at an outlet of the oil cooler are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to steam turbine technical field especially relates to steam turbine lubricating oil system preheating recovery device. BACKGROUND

[0002] At present, the steam turbine lubricating oil cooler of power plant all adopts open circulating water medium to take away lubricating oil heat, and the circulating water is circulated by evaporation and cooling in the cooling tower of the system, and the heat is discharged to the atmosphere, so that the heat cannot be effectively utilized and is wasted.

[0003] Specifically, in the normal operation of the existing low-pressure cylinder zero output heating (direct supply) steam turbine, a large amount of heat is generated by the high-speed rotation of the bearing, and the bearing heat is mainly brought back to the main oil tank (the lubricating oil temperature is above 50 DEG C) through the lubricating oil. The heat is taken away by the circulating water through the cooler, which causes the heat to be wasted. At the same time, the inlet water temperature of the condenser's chemical make-up water tank is generally about 25 DEG C. After the low-pressure cylinder zero output heating steam turbine is operated, a large amount of water needs to be supplied. Once the water supply temperature is low, it is easy to cause the condensate water dissolved oxygen to exceed the standard. Therefore, the steam turbine lubricating oil system preheating recovery device is proposed to solve the problems in the prior art. SUMMARY

[0004] In view of the above problems, the steam turbine lubricating oil system preheating recovery device is provided. The steam turbine lubricating oil system preheating recovery device recovers the heat of the oil introduced into the waste heat oil cooler by the water introduced into the waste heat oil cooler, heats and improves the chemical make-up water temperature, improves the water vapor index performance of the subsequent unit condenser, and reduces the heat absorption of the circulating cooling water of the subsequent original equipment oil cooler. It is very beneficial to reduce the corrosion rate of the circulating water pipeline and the scaling of the outlet water valve of the oil cooler.

[0005] To achieve the purpose of the utility model, the following technical scheme is adopted: a steam turbine lubricating oil system preheating recovery device, comprising a main oil tank, an oil refining device, a waste heat oil cooler and a side water supply pipeline, an oil outlet pipeline is connected between the oil outlet of the main oil tank and the oil refining device, and an oil return pipeline is connected between the oil return port of the oil refining device and the main oil tank, an oil inlet branch pipe and an oil side bypass are connected to the oil inlet and outlet of the waste heat oil cooler, respectively, and the ends of the oil inlet branch pipe and the oil side bypass away from the waste heat oil cooler are connected to the oil outlet pipeline, the oil inlet branch pipe and the oil side bypass are open-close switching type pipelines, and a first stop valve is arranged on the oil outlet pipeline between the oil inlet branch pipe and the oil side bypass.

[0006] The water inlet and the water outlet of the waste heat oil cooler are respectively provided with water inlet pipeline and water outlet pipeline, the water inlet pipeline and the water outlet pipeline are connected with the side water supplement pipeline at the far end from the waste heat oil cooler, the water inlet pipeline and the water outlet pipeline are open-close switching pipelines, the second stop valve is arranged on the side water supplement pipeline at the position between the water inlet pipeline and the water outlet pipeline, and the side water supplement pipeline is used for connecting the condenser.

[0007] Further improvement lies in that the oil inlet branch pipe is provided with a third stop valve, the oil inlet branch pipe is used for guiding the oil in the oil outlet pipeline into the waste heat oil cooler, the oil side bypass is provided with a fourth stop valve, and the oil side bypass is used for guiding the oil in the waste heat oil cooler into the oil outlet pipeline.

[0008] Further improvement lies in that the water inlet pipeline is provided with a fifth stop valve, the water inlet pipeline is used for guiding the water in the side water supplement pipeline into the waste heat oil cooler, the water outlet pipeline is provided with a sixth stop valve, and the water outlet pipeline is used for guiding the water in the waste heat oil cooler into the side water supplement pipeline.

[0009] Further improvement lies in that the first valve is arranged on the oil outlet pipeline at the position of the oil outlet of the main oil tank, and the second valve is arranged at the far end of the oil outlet pipeline from the first valve.

[0010] Further improvement lies in that the third valve is arranged on the oil return pipeline at the position of the oil return port of the oil refining device, and the fourth valve is arranged at the far end of the oil return pipeline from the third valve.

[0011] Further improvement lies in that the outer sides of the oil inlet branch pipe, the oil side bypass, the water inlet pipeline and the water outlet pipeline are all wrapped with heat preservation cotton.

[0012] The beneficial effects of the utility model are as follows:

[0013] 1. The utility model combines the waste heat gradient recycling principle, utilizes the steam turbine oil purification device to drive the lubricating oil circulation waste heat to heat the desalted water supplement, specifically, the oil outlet pipeline at the inlet of the steam turbine oil purification device system is connected with the waste heat oil cooler through the oil inlet branch pipe and the oil side bypass, the side water supplement pipeline of the condenser is connected with the waste heat oil cooler through the water inlet pipeline and the water outlet pipeline, the heat of the oil into the waste heat oil cooler is recycled through the water into the waste heat oil cooler, the heat is heated to improve the chemical water supplement temperature, the water vapor index performance of the subsequent unit condenser is improved, the heat absorption of the subsequent original equipment machine cooler is reduced, the corrosion rate of the circulating water pipeline is reduced, and the oil cooler outlet water valve baffle scaling is very beneficial.

[0014] 2, the utility model discloses make steam turbine cold end heat source loss big proportion reduce, unit water supplement rate greatly improve, heating improves the temperature of side water supplement pipeline in desalted water, solve the index abnormal problem of the operation index of the operation during the winter large heating, the condensate water supercooling degree of each unit condenser hot well is large after a large amount of water supplement, condensate water dissolved oxygen is seriously over the specified value. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the front view of the utility model.

[0016] Among them: 1, main oil tank;2, oil refining device;3, waste heat oil cooler;4, side water supplement pipeline;5, oil outlet pipeline;6, oil return pipeline;7, oil inlet branch pipe;8, oil side bypass;9, first stop valve;10, water inlet pipeline;11, water outlet pipeline;12, second stop valve;13, third stop valve;14, fourth stop valve;15, fifth stop valve;16, sixth stop valve;17, first valve;18, second valve;19, third valve;20, fourth valve. DETAILED DESCRIPTION

[0017] In order to deepen the understanding of the utility model, the utility model will be further described in combination with examples below, and the present embodiment is only used to explain the utility model, and does not constitute the limitation to the protection scope of the utility model.

[0018] Example one

[0019] According to Figure 1 As shown in the figure, the present embodiment proposes a steam turbine lubricating oil system preheating recovery device, which comprises a main oil tank 1, an oil refining device 2, a waste heat oil cooler 3 and a side water supplement pipeline 4, the oil outlet of the main oil tank 1 is connected with the oil refining device 2 through an oil outlet pipeline 5, and the oil return port of the oil refining device 2 is connected with the main oil tank 1 through an oil return pipeline 6, the oil inlet and oil outlet of the waste heat oil cooler 3 are connected with an oil inlet branch pipe 7 and an oil side bypass 8 respectively, and the ends of the oil inlet branch pipe 7 and the oil side bypass 8 away from the waste heat oil cooler 3 are connected with the oil outlet pipeline 5, the oil inlet branch pipe 7 and the oil side bypass 8 are both open-close switching type pipelines, and the oil outlet pipeline 5 between the oil inlet branch pipe 7 and the oil side bypass 8 is provided with a first stop valve 9;

[0020] The water inlet and outlet of the waste heat oil cooler 3 are respectively provided with water inlet pipeline 10 and water outlet pipeline 11, the far end of the water inlet pipeline 10 and the water outlet pipeline 11 from the waste heat oil cooler 3 are connected with the side water supplement pipeline 4, the water inlet pipeline 10 and the water outlet pipeline 11 are open-close switching pipelines, and the second stop valve 12 is arranged on the side water supplement pipeline 4 at the position between the water inlet pipeline 10 and the water outlet pipeline 11, and the side water supplement pipeline 4 is used for connecting the condenser. The waste heat oil cooler 3 is a general cooler, and has an oil cavity connected with the oil inlet branch pipe 7 and the oil side bypass 8, and also has a water channel connected with the water inlet pipeline 10 and the water outlet pipeline 11, the water channel surrounds the oil cavity to achieve the heat exchange purpose.

[0021] The third stop valve 13 is arranged on the oil inlet branch pipe 7, and the oil inlet branch pipe 7 is used for guiding the oil in the oil outlet pipeline 5 into the waste heat oil cooler, the fourth stop valve 14 is arranged on the oil side bypass 8, and the oil side bypass 8 is used for guiding the oil in the waste heat oil cooler into the oil outlet pipeline 5. The fifth stop valve 15 is arranged on the water inlet pipeline 10, and the water inlet pipeline is used for guiding the water in the side water supplement pipeline 4 into the waste heat oil cooler 3, and the sixth stop valve 16 is arranged on the water outlet pipeline 11, and the water outlet pipeline 11 is used for guiding the water in the waste heat oil cooler 3 into the side water supplement pipeline 4.

[0022] Step 1: prepare to put into the waste heat oil cooler 3;

[0023] Step 2: slightly open the third stop valve 13 to perform the oil side oil filling operation, and then slowly fully open the third stop valve 13 to connect the oil inlet branch pipe 7;

[0024] Step 3: fully open the first stop valve 9, and then slowly close the fourth stop valve 14 to close the oil side bypass 8;

[0025] Step 4: sequentially close the fifth stop valve 15, the sixth stop valve 16, and the second stop valve 12;

[0026] The condenser has a vacuum deoxidizing device, and due to the low temperature of the unit water supplement, it is difficult to remove the non-condensable gas in the water at one time. After the technology, the desalted water temperature is heated before entering the condenser to improve the water supplement temperature to above 40 DEG C, and the deoxidizing effect of the condenser vacuum deoxidizing device is improved.

[0027] The first valve 17 is arranged on the oil outlet pipeline 5 at the oil outlet position of the main oil tank 1, and the second valve 18 is arranged on the oil outlet pipeline 5 away from the first valve 17. The third valve 19 is arranged on the oil return pipeline 6 at the oil return position of the oil refining device 2, and the fourth valve 20 is arranged on the oil return pipeline 6 away from the third valve 19. The first valve 17 and the second valve 18 are used for closing or opening the oil outlet pipeline 5, and the third valve 19 and the fourth valve 20 are used for closing or opening the oil return pipeline 6.

[0028] Example two

[0029] According to Figure 1 As shown in the figure, the embodiment proposes a steam turbine lubricating oil system preheating recovery device, which comprises a main oil tank 1, an oil refining device 2, a waste heat oil cooler 3 and a side water supplement pipeline 4. An oil outlet of the main oil tank 1 is connected with the oil refining device 2 through an oil outlet pipeline 5, and a return oil port of the oil refining device 2 is connected with the main oil tank 1 through a return oil pipeline 6. An oil inlet and an oil outlet of the waste heat oil cooler 3 are respectively connected with an oil inlet branch pipe 7 and an oil side bypass 8, and one ends of the oil inlet branch pipe 7 and the oil side bypass 8 away from the waste heat oil cooler 3 are connected with the oil outlet pipeline 5. The oil inlet branch pipe 7 and the oil side bypass 8 are open-close switching pipelines, and a first stop valve 9 is arranged on the oil outlet pipeline 5 at a position between the oil inlet branch pipe 7 and the oil side bypass 8.

[0030] A water inlet and a water outlet of the waste heat oil cooler 3 are respectively provided with a water inlet pipeline 10 and a water outlet pipeline 11, one ends of the water inlet pipeline 10 and the water outlet pipeline 11 away from the waste heat oil cooler 3 are connected with the side water supplement pipeline 4. The water inlet pipeline 10 and the water outlet pipeline 11 are open-close switching pipelines, and a second stop valve 12 is arranged on the side water supplement pipeline 4 at a position between the water inlet pipeline 10 and the water outlet pipeline 11. The side water supplement pipeline 4 is used for connecting a condenser. The waste heat oil cooler 3 is a general cooler, which has an oil cavity connected with the oil inlet branch pipe 7 and the oil side bypass 8, and also has a water channel connected with the water inlet pipeline 10 and the water outlet pipeline 11. The water channel surrounds the oil cavity to achieve the purpose of heat exchange.

[0031] A first valve 17 is arranged on the oil outlet pipeline 5 at a position of the main oil tank 1, and a second valve 18 is arranged on the oil outlet pipeline 5 away from the first valve 17. A third valve 19 is arranged on the return oil pipeline 6 at a position of the oil refining device 2, and a fourth valve 20 is arranged on the return oil pipeline 6 away from the third valve 19. The first valve 17 and the second valve 18 are used for closing or opening the oil outlet pipeline 5, and the third valve 19 and the fourth valve 20 are used for closing or opening the return oil pipeline 6.

[0032] The oil inlet branch pipe 7, the oil side bypass 8, the water inlet pipeline 10 and the water outlet pipeline 11 are all wrapped with thermal insulation cotton. In actual application, in order to ensure the best precipitation effect of dissolved oxygen in the water supplement, the water outlet temperature of the waste heat oil cooler 3 is strictly controlled to be not less than 40℃, and the specific operation is carried out by reducing the water supplement flow. In addition, since the device is arranged far away from the condenser water supplement port, in order to ensure that the temperature of the desalted water after the transformation does not drop too much, the related water supplement pipelines are insulated to reduce the heat source loss.

[0033] Through the electronic enthalpy entropy table: water temperature 25 DEG C check the enthalpy value 104.81 kj / kg, 40 DEG C enthalpy value 167.48 kj / kg; steam pressure 0.90 Mpa, temperature 290 DEG C check the enthalpy value 3029.5 kj / kg;Chemical make-up water (single side) / large machine oil purification flow is 110 / 170 t / h. Through steam heating into the equivalent lubricating oil waste heat utilization, energy saving benefits according to winter heating season 120 days calculation:

[0034] 130 yuan × 24 h × 120 d = 84.54 million yuan.

[0035] Winter heating period using lubricating oil waste heat to improve the temperature of chemical make-up water, compared with using steam heating, can save the production cost of steam heating 84.54 million yuan / year.

[0036] The preheating recovery device of the steam turbine lubricating oil system combines the waste heat gradient recycling principle, and uses the circulating waste heat of the lubricating oil purification device of the steam turbine to heat the desalted water make-up water, specifically, the oil outlet pipeline 5 at the inlet of the lubricating oil purification device system is connected to the waste heat oil cooler 3 through the oil inlet branch pipe 7 and the oil side bypass 8, and the side make-up water pipeline 4 of the condenser is connected to the waste heat oil cooler 3 through the water inlet pipeline 10 and the water outlet pipeline 11, the heat of the oil entering the waste heat oil cooler 3 is recovered by the water entering the waste heat oil cooler 3, the heat of the oil is heated to improve the temperature of the chemical make-up water, to improve the water vapor index performance of the subsequent unit condenser, and the heat absorption of the circulating cooling water of the subsequent original equipment oil cooler is reduced, which is very beneficial to reducing the corrosion rate of the circulating water pipeline and the fouling of the outlet water valve of the oil cooler. And the loss of the cold end heat source of the steam turbine is greatly reduced, the make-up water rate of the unit is greatly improved, the temperature of the desalted water in the side make-up water pipeline 4 is heated to improve, and the problem of the overlarge subcooling degree of the condensate water and the serious over-regulation of the dissolved oxygen of the condensate water after a large amount of make-up water is supplied to the condenser of each unit during winter heating operation is solved.

[0037] The above shows and describes the basic principle, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above examples, and the above examples and descriptions in the specification are only to illustrate the principle of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A preheating recovery device for a steam turbine lubricating oil system, comprising a main oil tank (1), an oil refining device (2), a waste heat oil cooler (3), and a side water supply pipeline (4), characterized in that: An oil outlet pipe (5) is connected between the oil outlet of the main oil tank (1) and the oil refining device (2), and an oil return pipe (6) is connected between the oil return port of the oil refining device (2) and the main oil tank (1). An oil inlet branch pipe (7) and an oil side bypass (8) are connected to the oil inlet and the oil outlet of the waste heat cooler (3), respectively. The ends of the oil inlet branch pipe (7) and the oil side bypass (8) that are away from the waste heat cooler (3) are connected to the oil outlet pipe (5). The oil inlet branch pipe (7) and the oil side bypass (8) are both open and closed switching pipes. A first shut-off valve (9) is provided on the oil outlet pipe (5) at the position between the oil inlet branch pipe (7) and the oil side bypass (8). The waste heat cooler (3) has an inlet pipe (10) and an outlet pipe (11) respectively. The ends of the inlet pipe (10) and the outlet pipe (11) away from the waste heat cooler (3) are connected to the side water supply pipe (4). The inlet pipe (10) and the outlet pipe (11) are both open and closed switching pipes. A second shut-off valve (12) is provided on the side water supply pipe (4) at the position between the inlet pipe (10) and the outlet pipe (11). The side water supply pipe (4) is used to connect to the condenser.

2. The preheating and recovery device for a turbine lubricating oil system according to claim 1, characterized in that: The oil inlet branch pipe (7) is equipped with a third shut-off valve (13), and the oil inlet branch pipe (7) is used to pass the oil in the oil outlet pipe (5) into the waste heat cooler. The oil side bypass (8) is equipped with a fourth shut-off valve (14), and the oil side bypass (8) is used to pass the oil in the waste heat cooler into the oil outlet pipe (5).

3. The preheating and recovery device for a turbine lubricating oil system according to claim 2, characterized in that: The water inlet pipe (10) is equipped with a fifth shut-off valve (15), and the water inlet pipe is used to pass water from the side water supply pipe (4) into the waste heat cooler (3). The water outlet pipe (11) is equipped with a sixth shut-off valve (16), and the water outlet pipe (11) is used to pass water from the waste heat cooler (3) into the side water supply pipe (4).

4. The preheating and recovery device for a turbine lubricating oil system according to claim 1, characterized in that: A first valve (17) is provided on the oil outlet pipe (5) at the oil outlet position of the main oil tank (1), and a second valve (18) is provided at the end of the oil outlet pipe (5) away from the first valve (17).

5. The preheating and recovery device for a turbine lubricating oil system according to claim 4, characterized in that: The oil return pipe (6) at the oil return port of the oil refining device (2) is provided with a third valve (19), and a fourth valve (20) is provided at the end of the oil return pipe (6) away from the third valve (19).

6. The preheating and recovery device for a turbine lubricating oil system according to claim 1, characterized in that: The outer sides of the oil inlet branch pipe (7), oil side bypass (8), water inlet pipe (10) and water outlet pipe (11) are all covered with thermal insulation cotton.

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