A steam turbine exhaust steam temperature regulating device

Abstract

The present invention discloses a steam turbine exhaust temperature regulating device, which includes a low-pressure cylinder and a cooling mechanism. The cooling mechanism includes a cooling component, a water delivery pipe, a water return pipe and a cooling tank. The cooling tank is arranged inside the side wall of the low-pressure cylinder. One end of the water delivery pipe is connected to the water outlet of the cooling component, and the other end of the water delivery pipe is connected to the water inlet of the cooling tank. One end of the water return pipe is connected to the water outlet of the cooling tank, and the other end of the water return pipe is connected to the water inlet of the cooling component. The achieved technical effects are as follows: The cooling tank is arranged inside the side wall of the low-pressure cylinder, and the cooling effect is better. During the use process, the temperature of the low-pressure cylinder can be reduced more evenly, so as to ensure that the exhaust temperature will not be too high; The cooling component, the water delivery pipe, the water return pipe and the cooling tank form a closed loop, and can continuously circulate during the use process. During the use process, by flexibly adjusting the size of the water flow in the closed loop, the temperature of the low-pressure cylinder can be kept continuously stable, so as to ensure the stability of the steam turbine exhaust temperature.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbine exhaust, and in particular to a steam turbine exhaust temperature regulating device. Background Art

[0002] Large steam turbines have strict requirements on the exhaust temperature of the low-pressure cylinder. When the temperature exceeds a certain range, it will cause serious damage to the cylinder, rotor, blades, and condenser of the steam turbine. Therefore, a cooling device is usually installed on the low-pressure cylinder.

[0003] When the steam turbine is started, running at no load or at low load, the steam flow rate is very small, which is not enough to take away the heat generated by the blast friction in the low-pressure cylinder, so the exhaust temperature rises, and the exhaust cylinder temperature also rises accordingly. Excessive exhaust cylinder temperature will cause a large deformation of the cylinder, destroy the consistency of the center line of the moving and static parts of the steam turbine, and in severe cases will cause unit vibration or other accidents. The usual cooling method is water spraying, but the flow rate of cooling water is fixed when spraying water. When the exhaust temperature just exceeds the set value, a large amount of water spraying will cause the exhaust temperature to drop below the set value suddenly, which will have an adverse effect on the low-pressure cylinder; when the exhaust temperature is high, the cooling speed is too slow, which will still have an adverse effect on the cylinder, rotor, blades, and condenser of the steam turbine. Therefore, a device that can flexibly adjust the exhaust temperature of the steam turbine is urgently needed. Summary of the invention

[0004] To this end, the present invention provides a steam turbine exhaust temperature regulating device to solve the above-mentioned problems in the prior art.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] According to a first aspect of the present invention, a steam turbine exhaust temperature regulating device comprises a low-pressure cylinder and a cooling mechanism, wherein the cooling mechanism comprises a cooling component, a water supply pipe, a return water pipe and a cooling tank, wherein the cooling tank is arranged in the side wall of the low-pressure cylinder, one end of the water supply pipe is connected to the water outlet of the cooling component, the other end of the water supply pipe is connected to the water inlet of the cooling tank, one end of the return water pipe is connected to the water outlet of the cooling tank, and the other end of the return water pipe is connected to the water inlet of the cooling component.

[0007] Furthermore, the cooling component includes a water tank and a water pump, the water pump is installed on the water tank, the water inlet of the water pump is connected to the inside of the water tank, and the water outlet of the water pump is connected to the end of the water pipe away from the cooling tank.

[0008] Furthermore, the cooling component also includes a water inlet pipe and a water outlet pipe, the water inlet pipe is connected to the water inlet of the water tank, and the water outlet pipe is connected to the water outlet of the water tank.

[0009] Further, the temperature reduction assembly further includes a spiral pipeline, which is arranged in the water tank. One end of the spiral pipeline is connected to the water inlet of the water pump, and the other end of the spiral pipeline is connected to the end of the return pipe away from the temperature reduction tank.

[0010] Further, the temperature reduction assembly further includes a first valve and a second valve. The first valve is arranged on the water inlet pipe, and the second valve is arranged on the water outlet pipe.

[0011] Further, the temperature reduction mechanism further includes a first temperature sensor, which is arranged on the inner side wall of the low-pressure cylinder.

[0012] Further, the temperature reduction mechanism further includes a second temperature sensor, which is arranged in the water tank.

[0013] Further, the temperature reduction mechanism further includes a controller. The first valve and the second valve are both solenoid valves. The first valve, the second valve, the water pump, the first temperature sensor, and the second temperature sensor are all electrically connected to the controller, and the controller is electrically connected to an external power supply.

[0014] Further, a connecting pipe is further included, which is arranged at one end of the low-pressure cylinder.

[0015] Further, an alarm is further included, which is electrically connected to the controller.

[0016] The present invention has the following advantages: The temperature reduction mechanism includes a temperature reduction assembly, a water delivery pipe, a return pipe, and a temperature reduction tank. The temperature reduction tank is arranged inside the side wall of the low-pressure cylinder, and the temperature reduction effect is better. During the use process, the temperature of the low-pressure cylinder can be reduced more evenly, so as to ensure that the exhaust steam temperature will not be too high; By setting the temperature reduction assembly, the temperature reduction assembly, the water delivery pipe, the return pipe, and the temperature reduction tank form a temperature reduction closed loop, which can continuously circulate during the use process. During the use process, by flexibly adjusting the size of the water flow in the temperature reduction closed loop, the temperature of the low-pressure cylinder can be kept continuously stable, so as to ensure the stability of the steam turbine exhaust steam temperature. Description of the Drawings

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained according to the provided drawings.

[0018] The structures, proportions, sizes, etc. illustrated in this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present invention. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention.

[0019] Figure 1 FIG. 4 is a schematic diagram of the overall structure of a steam turbine exhaust temperature regulating device provided by some embodiments of the present invention.

[0020] Figure 2 FIG. 8 is a schematic diagram of the structure of a cooling tank of a steam turbine exhaust temperature regulating device provided by some embodiments of the present invention.

[0021] Figure 3 FIG. 12 is a schematic diagram of the structure of a water tank of a steam turbine exhaust temperature regulating device provided by some embodiments of the present invention.

[0022] Figure 4 FIG. 16 is a schematic diagram of the structure of a spiral pipeline of a steam turbine exhaust temperature regulating device provided by some embodiments of the present invention.

[0023] Figure 5 FIG. 20 is a schematic diagram of the installation of a first temperature sensor of a steam turbine exhaust temperature regulating device provided by some embodiments of the present invention.

[0024] In the figure: 1, low-pressure cylinder; 2, connecting pipe; 3, water tank; 4, water delivery pipe; 5, return water pipe; 6, water pump; 7, water inlet pipe; 8, water outlet pipe; 9, controller; 10, cooling tank; 11, first temperature sensor; 12, first valve; 13, second valve; 14, spiral pipeline; 15, second temperature sensor. Detailed Embodiments

[0025] The following specific embodiments illustrate the implementation manners of the present invention. Those familiar with this technology can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Such as Figures 1 to 5As shown in the figure, a steam turbine exhaust steam temperature regulating device in an embodiment of the first aspect of the present invention includes a low-pressure cylinder 1 and a cooling mechanism. The cooling mechanism includes a cooling component, a water delivery pipe 4, a water return pipe 5, and a cooling tank 10. The cooling tank 10 is arranged inside the side wall of the low-pressure cylinder 1. One end of the water delivery pipe 4 is connected to the water outlet of the cooling component, and the other end of the water delivery pipe 4 is connected to the water inlet of the cooling tank 10. One end of the water return pipe 5 is connected to the water outlet of the cooling tank 10, and the other end of the water return pipe 5 is connected to the water inlet of the cooling component.

[0027] In the above embodiment, it should be noted that during use, when the temperature of the low-pressure cylinder 1 is higher than the set value, the cooling component forms cooling water, and the cooling water is conveyed to the cooling tank 10 through the water delivery pipe 4, thereby cooling the low-pressure cylinder 1. After the cooling water in the cooling tank 10 absorbs heat, it then enters the cooling component through the water return pipe 5 to be cooled again and recycled. The cooling component, the water delivery pipe 4, the water return pipe 5, and the cooling tank 10 form a closed loop and can continuously circulate during use. The water output of the cooling water in the cooling component is adjustable; seals are provided at the connections of the water delivery pipe 4 and the water return pipe 5 with other components to prevent liquid leakage.

[0028] The technical effects achieved by the above embodiment are as follows: The cooling mechanism includes a cooling component, a water delivery pipe 4, a water return pipe 5, and a cooling tank 10. The cooling tank 10 is arranged inside the side wall of the low-pressure cylinder 1, and the cooling effect is better. During use, the temperature of the low-pressure cylinder 1 can be reduced more evenly, thereby ensuring that the exhaust steam temperature will not be too high; by setting the cooling component, the cooling component, the water delivery pipe 4, the water return pipe 5, and the cooling tank 10 form a closed loop. During use, by flexibly adjusting the size of the water flow in the cooling closed loop, the temperature of the low-pressure cylinder 1 can be kept continuously stable, thereby ensuring the stability of the steam turbine exhaust steam temperature. Moreover, the cooling water is recycled, which can effectively save water.

[0029] Optionally, as Figures 1 to 5 shown, in some embodiments, the cooling component includes a water tank 3 and a water pump 6. The water pump 6 is installed on the water tank 3. The water inlet of the water pump 6 is communicated with the inside of the water tank 3, and the water outlet of the water pump 6 is connected to the end of the water delivery pipe 4 away from the cooling tank 10.

[0030] In the above optional embodiment, it should be noted that a fixing frame is provided on the water tank 3, and the water pump 6 is installed on the fixing frame.

[0031] The beneficial effects of the above optional implementation regulations are as follows: the cooling component includes a water tank 3 and a water pump 6. The water tank 3 can provide cooling water, and the cooling water in the water tank can be added to the cooling tank 10 through the water pump 6, so as to cool the low-pressure cylinder 1. Combined with the return pipe 5, a closed circulation loop is formed, and the cooling water flow rate can be flexibly adjusted by adjusting the water output of the water pump 1, thereby flexibly controlling the cooling effect and ensuring that the temperature of the low-pressure cylinder 1 is always within a stable numerical range.

[0032] Optional, such as Figures 1 to 5 As shown, in some embodiments, the cooling component further includes a water inlet pipe 7 and a water outlet pipe 8, the water inlet pipe 7 is connected to the water inlet of the water tank 3, and the water outlet pipe 8 is connected to the water outlet of the water tank 3.

[0033] In the above optional embodiments, it should be noted that the water inlet of the water tank 3 is located at the top of the water tank 3, the water outlet of the water tank 3 is located at the bottom of the water tank 3, the water inlet pipe 7 is connected to the external cooling water supply network, and the water outlet pipe 8 is connected to the external cooling water return network.

[0034] The beneficial effect of the above optional implementation regulations is: by setting the water inlet pipe 7 and the water outlet pipe 8, when the temperature of the cooling water in the water tank 3 is too high and the cooling effect cannot be achieved, the cooling water in the water tank 3 can be conveniently discharged for replacement, thereby ensuring the cooling effect.

[0035] Optional, such as Figures 1 to 5 As shown, in some embodiments, the cooling component also includes a spiral pipe 14, which is arranged in the water tank 3, one end of the spiral pipe 14 is connected to the water inlet of the water pump 6, and the other end of the spiral pipe 14 is connected to the end of the return pipe 5 away from the cooling tank 10.

[0036] In the above optional embodiment, it should be noted that the spiral pipe 14 is spiral-shaped and is made of a copper pipe.

[0037] The beneficial effect of the above optional implementation regulations is: by setting up the spiral pipe 14, the spiral pipe 14, the water pipe 4, the cooling tank 10 and the return pipe 5 together form a closed loop, and the cooling water in the cooling tank 10 is cooled in the water tank 3 through the spiral pipe 14 and then circulated. The spiral pipe 14 is spiral, which increases the contact area with the cooling water inside the water tank 3 and has a better cooling effect.

[0038] Optional, such as Figures 1 to 5 As shown, in some embodiments, the cooling component further includes a first valve 12 and a second valve 13 , the first valve 12 is disposed on the water inlet pipe 7 , and the second valve 13 is disposed on the water outlet pipe 8 .

[0039] In the above optional embodiment, it should be noted that the first valve 12 and the second valve 13 are both electric valves.

[0040] The beneficial effects of the above optional embodiments are as follows: By providing the first valve 12 and the second valve 13, it is possible to conveniently control the addition and discharge of the cooling water in the water tank 3, facilitating the regular cleaning of the water tank 3.

[0041] Optionally, as Figures 1 to 5 shown, in some embodiments, the cooling mechanism further includes a first temperature sensor 11, and the first temperature sensor 11 is disposed on the inner side wall of the low-pressure cylinder 1.

[0042] In the above optional embodiments, it should be noted that the first temperature sensor 11 is used to monitor the temperature of the low-pressure cylinder 1, so as to timely adjust the temperature of the low-pressure cylinder 1.

[0043] The beneficial effects of the above optional embodiments are as follows: By providing the first temperature sensor 11, it is possible to conveniently monitor the temperature of the low-pressure cylinder 1, and thus flexibly adjust the water output of the cooling water of the cooling component according to the temperature of the low-pressure rod 1, ensuring the stability of the temperature of the low-pressure cylinder 1.

[0044] Optionally, as Figures 1 to 5 shown, in some embodiments, the cooling mechanism further includes a second temperature sensor 15, and the second temperature sensor 15 is disposed in the water tank 3.

[0045] In the above optional embodiments, it should be noted that the second temperature sensor 15 is used to monitor the temperature of the cooling water in the water tank 3.

[0046] The beneficial effects of the above optional embodiments are as follows: By providing the second temperature sensor 15, it is possible to conveniently monitor the temperature of the cooling water in the water tank 3, so as to timely replace it when the temperature of the cooling water in the water tank 3 is too high, thereby ensuring the cooling effect.

[0047] Optionally, as Figures 1 to 5 shown, in some embodiments, the cooling mechanism further includes a controller 9. The first valve 12 and the second valve 13 are both solenoid valves. The first valve 12, the second valve 13, the water pump 6, the first temperature sensor 11, and the second temperature sensor 15 are all electrically connected to the controller 9, and the controller 9 is electrically connected to an external power supply.

[0048] In the above optional embodiments, it should be noted that during use, the first temperature sensor 11 and the second temperature sensor 15 transmit the detected temperature information to the controller 9. The controller 9 controls the rotation speed of the water pump 6 according to the level of the temperature detected by the first temperature sensor 11. The higher the temperature detected by the first temperature sensor 11 exceeds the set value, the faster the rotation speed of the water pump 6, so as to provide sufficient cooling water to timely reduce the temperature of the low-pressure cylinder 1. When the temperature detected by the first temperature sensor 11 exceeds the set value by a small amount, the controller 9 controls the water pump 9 to run at a low speed, thereby preventing excessive cooling from causing the temperature of the low-pressure cylinder 1 to be too low. When the first temperature sensor 11 detects that the temperature of the low-pressure cylinder 1 has dropped below the set temperature, the controller 9 controls the water pump 6 to close; when the second temperature sensor 15 detects that the temperature of the cooling water in the water tank 3 exceeds the set value, the controller 9 controls the first valve 12 and the second valve 13 to open to replace the cooling water in the water tank 3. After the replacement is completed, the controller 9 controls the first valve 12 and the second valve 13 to close.

[0049] The beneficial effects of the above optional embodiments are as follows: By setting the controller 9, both the first valve 12 and the second valve 13 are solenoid valves. The first valve 12, the second valve 13, the water pump 6, the first temperature sensor 11, and the second temperature sensor 15 are all electrically connected to the controller 9. Automatic control can be achieved during use, with higher control accuracy and more convenient use.

[0050] Optionally, as Figures 1 to 5 shown, in some embodiments, it further includes a connecting pipe 2 and an alarm. The connecting pipe 2 is arranged at one end of the low-pressure cylinder 1, and the alarm is electrically connected to the controller 9.

[0051] In the above optional embodiments, it should be noted that during use, when the controller 9 recognizes that the temperature detected by the first temperature sensor 11 or the second temperature sensor 15 exceeds the set value, the controller 9 activates the alarm to issue an alarm.

[0052] The beneficial effects of the above optional embodiments are as follows: By setting the connecting pipe 2, the low-pressure cylinder 1 can be conveniently connected to other components of the steam turbine; by setting the alarm, an alarm can be issued in a timely manner when the temperature of the low-pressure cylinder 1 or the water tank 3 is too high, thereby reminding the on-site personnel to pay attention to the operation of the equipment.

[0053] Although the present invention has been described in detail above with general descriptions and specific embodiments, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

[0054] Terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of clear description and are not used to limit the scope of implementation of the present invention. Changes or adjustments in their relative relationships, without substantial changes in the technical content, should also be regarded as the scope of implementation of the present invention.

Claims

1. A steam turbine exhaust temperature regulating device, characterized in that, The invention comprises a low-pressure cylinder (1) and a cooling mechanism, wherein the cooling mechanism comprises a cooling component, a water delivery pipe (4), a water return pipe (5) and a cooling trough (10), wherein the cooling trough (10) is arranged in the side wall of the low-pressure cylinder (1) to more evenly reduce the temperature of the low-pressure cylinder (1), wherein one end of the water delivery pipe (4) is connected to the water outlet of the cooling component, and the other end of the water delivery pipe (4) is connected to the water inlet of the cooling trough (10), and one end of the water return pipe (5) is connected to the water outlet of the cooling trough (10), and the other end of the water return pipe (5) is connected to the water inlet of the cooling component; The cooling component comprises a water tank (3), a water pump (6), a water inlet pipe (7), a water outlet pipe (8), a first valve (12) and a second valve (13); the water pump (6) is installed on the water tank (3); the water inlet of the water pump (6) is communicated with the interior of the water tank (3); the water outlet of the water pump (6) is connected to an end of the water delivery pipe (4) away from the cooling tank (10); the water inlet pipe (7) is connected to the water inlet of the water tank (3); the water outlet pipe (8) is connected to the water outlet of the water tank (3); the first valve (12) is arranged on the water inlet pipe (7); the second valve (13) is arranged on the water outlet pipe (8); the first valve (12) and the second valve (13) are both electric valves; The cooling mechanism further comprises a controller (9), a first temperature sensor (11) and a second temperature sensor (15); the first temperature sensor (11) is arranged on the inner wall of the low-pressure cylinder (1), and the second temperature sensor (15) is arranged in the water tank (3); the first temperature sensor (11) and the second temperature sensor (15) transmit detected temperature information to the controller (9); the controller (9) controls the rotation speed of the water pump (6) according to the temperature detected by the first temperature sensor (11); the higher the temperature detected by the first temperature sensor (11) exceeds the set value, the faster the rotation speed of the water pump (6); and when the temperature detected by the first temperature sensor (11) exceeds the set value, the rotation speed of the water pump (6) increases. When the temperature detected by a temperature sensor (11) is close to a set value, the controller (9) controls the water pump (6) to operate at a low speed; when the first temperature sensor (11) detects that the temperature of the low-pressure cylinder (1) drops below the set temperature, the controller (9) controls the water pump (6) to turn off; when the second temperature sensor (15) detects that the temperature of the cooling water in the water tank (3) exceeds the set value, the controller (9) controls the first valve (12) and the second valve (13) to open, and replaces the cooling water in the water tank (3); after the replacement is completed, the controller (9) controls the first valve (12) and the second valve (13) to close.

2. The steam turbine exhaust temperature regulating device according to claim 1, characterized in that, The cooling component further comprises a spiral pipe (14), wherein the spiral pipe (14) is arranged in the water tank (3), one end of the spiral pipe (14) is connected to the water inlet of the water pump (6), and the other end of the spiral pipe (14) is connected to an end of the return pipe (5) away from the cooling tank (10).

3. The steam turbine exhaust temperature regulating device according to claim 1, characterized in that, It also includes a connecting pipe (2), wherein the connecting pipe (2) is arranged at one end of the low-pressure cylinder (1).

4. The steam turbine exhaust temperature regulating device according to claim 1, characterized in that, It also includes an alarm, which is electrically connected to the controller (9).

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