Heating device for shaft seal system of photo-thermal power station

Abstract

The utility model belongs to the technical field of heating equipment, and particularly discloses a heating device for a shaft seal system of a photo-thermal power station, which comprises a medium pipe comprising a medium input end and a medium output end which are arranged in an isolated manner, the medium pipe is provided with a differential pressure transmitter used for detecting the pressure difference between the medium input end and the medium output end. The heater is respectively communicated with the medium input end and the medium output end and is used for heating the medium in the medium pipe; and the control box is electrically connected with the differential pressure transmitter and the heater. According to the utility model, the use requirements of complete monitoring functions, real-time automatic control, rapid temperature rise and automatic start and stop according to the flow direction of a medium can be realized, and favorable conditions are created for efficient, stable and safe operation of a turboset.

Description

Heating device for shaft sealing system of solar thermal power plant Technical Field

[0001] This utility model relates to the field of heating equipment for solar thermal power plants, and in particular to a shaft seal heating system. Background Technology

[0002] Solar energy, as an abundant, clean, and renewable energy source, has enormous development potential. With continuous technological advancements, people have gained a deeper understanding of key technologies such as solar energy collection, conversion, and storage, and concentrated solar power (CSP) has now achieved large-scale application. CSP is a power generation method that utilizes solar energy to convert light energy into heat energy, and then converts heat energy into electricity. It mainly relies on solar concentrators to focus sunlight onto a specific heat collection device. Molten salt is used as a heat carrier in the heat collection device. The heat carrier absorbs heat and flows to a medium generation system to generate electricity, which then drives a generator to produce electricity. CSP technology is environmentally friendly, renewable, and highly efficient, making it a promising new type of clean energy.

[0003] This invention relates to a shaft seal heater device applied in the turbine system of a solar thermal power plant. A turbine is a rotary machine that converts the thermal energy of a medium into mechanical energy. When the medium from the solar thermal power plant's medium generation system enters the turbine, its thermal energy is converted into the mechanical energy of the turbine rotor's rotation. This mechanical energy drives the generator rotor to rotate, causing the generator to generate an induced electromotive force and output electrical energy, thus completing the conversion process from thermal energy to mechanical energy and then to electrical energy.

[0004] In the existing technology, shaft seal heaters have a single function, generally only equipped with electric heating elements, pressure vessels, and instruments for interlocking control of heater heating temperature. Due to the variable operating conditions and frequent start-stop of the turbine units in solar thermal power plants, the current heaters cannot achieve automatic control functions according to actual operating conditions. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a heating device for the shaft sealing system of a solar thermal power plant, which solves the problem that the heater in the prior art cannot achieve automatic control according to the actual working conditions.

[0006] To achieve the above and other related objectives, this utility model provides a heating device for a shaft sealing system of a solar thermal power plant, comprising:

[0007] A medium tube, comprising a medium input end and a medium output end, wherein the medium input end and the medium output end are isolated from each other, and the medium tube is provided with a differential pressure transmitter for detecting the pressure difference between the medium input end and the medium output end;

[0008] A heater, which is connected to the medium input terminal and the medium output terminal respectively, and is used to heat the medium in the medium tube;

[0009] A control box, which is electrically connected to the differential pressure transmitter and the heater.

[0010] Optionally, the medium pipe is provided with a first valve for connecting the medium input end and the medium output end, and the medium pipe is provided with a first temperature sensor located near the medium input end. The first valve and the first temperature sensor are electrically connected to the control box.

[0011] Optionally, the heater is provided with an input pipe that communicates with the medium output end. The medium in the medium pipe enters the heater through the input pipe. The input pipe is provided with a second valve, which is electrically connected to the control box.

[0012] Optionally, the heater is provided with an output pipe that communicates with the medium output terminal. The medium in the heater enters the medium output terminal through the output pipe. The output pipe is provided with a third valve and a second temperature sensor. The third valve and the second temperature sensor are electrically connected to the control box.

[0013] Optionally, the heating device for the shaft sealing system of the solar thermal power plant further includes a drainage system, which is installed on the heater.

[0014] Optionally, the hydrophobic system includes a level gauge and a hydrophobic mechanism respectively disposed on the heater. The level gauge is used to detect condensate in the heater, and the input end of the hydrophobic mechanism is connected to the internal space of the heater and is used to drain the condensate in the heater.

[0015] Optionally, the drainage mechanism includes a drain valve and a drain valve. The drain valve is disposed in the heater, and the input end of the drain valve is in communication with the interior of the heater. The input end of the drain valve is also in communication with the interior of the heater.

[0016] Optionally, a first connecting pipe is provided between the medium input end and the second valve, and the free end of the first connecting pipe is connected to the differential pressure transmitter; a second connecting pipe is provided between the third valve and the medium output end, and the free end of the second connecting pipe is connected to the differential pressure transmitter.

[0017] Optionally, the heater is equipped with a safety valve.

[0018] Optionally, the heater is equipped with a pressure transmitter.

[0019] As described above, the heating device for the shaft sealing system of the solar thermal power plant proposed in this utility model has the following beneficial effects:

[0020] In this invention, a differential pressure transmitter is installed to monitor the pressure difference between the medium input end and the medium output end in real time, thereby determining whether the current medium flow direction is forward or reverse, thus determining the operating conditions, and then adjusting the temperature of the heater accordingly. Compared with the prior art, this invention enables the heater to meet the requirements of complete monitoring functions, real-time automatic control, rapid heating, and automatic start-stop according to the medium flow direction under the conditions of variable operating conditions, frequent start-stop, and unattended operation of the steam turbine unit in solar thermal power plants, creating favorable conditions for the efficient, stable, and safe operation of the steam turbine unit. Attached Figure Description

[0021] Figure 1 shows a structural schematic diagram of an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] Medium pipe 1, medium input end 101, medium output end 102, first temperature sensor 2, first connecting pipe 3, second connecting pipe 4, differential pressure transmitter 5, first valve 6, input pipe 7, second valve 8, pressure transmitter 9, safety valve 10, output pipe 11, second temperature sensor 12, third valve 13, level gauge 14, drain valve 15, steam trap 16, heater 17, control box 18. Detailed Implementation

[0024] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0025] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show components related to this utility model and are not drawn according to the actual number, shape, and size of the components in implementation. In actual implementation, the form, quantity, and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex. The structures, proportions, sizes, etc., shown in the accompanying drawings are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0026] As shown in Figure 1, this utility model proposes a heating device for a shaft sealing system of a solar thermal power plant.

[0027] In one exemplary embodiment, the heating device for the shaft sealing system of a concentrated solar power plant includes:

[0028] Medium pipe 1 includes a medium input end 101 and a medium output end 102, which are isolated from each other. A differential pressure transmitter 5 is provided on medium pipe 1 for detecting the pressure difference between medium input end 101 and medium output end 102.

[0029] Heater 17 is connected to medium input terminal 101 and medium output terminal 102 respectively, and is used to heat the medium in medium pipe 1;

[0030] Control box 18 is electrically connected to differential pressure transmitter 5 and heater 17.

[0031] In this embodiment, the differential pressure transmitter 5 can monitor the pressure difference between the medium input end 101 and the medium output end 102 in real time to determine whether the current medium flow direction is forward or reverse, thereby determining the operating conditions and adjusting the temperature of the heater 17 accordingly. Compared with the prior art, this utility model enables the heater 17 to meet the requirements of complete monitoring functions, real-time automatic control, rapid heating, and automatic start-stop according to the medium flow direction under the conditions of variable operating conditions, frequent start-stop, and unattended operation of the steam turbine unit in the solar thermal power plant, creating favorable conditions for the efficient, stable, and safe operation of the steam turbine unit.

[0032] It is worth noting that when the differential pressure transmitter 5 in this embodiment is positive, that is, the pressure at the medium input end 101 is greater than the pressure at the medium output end 102, it proves that the medium is being output normally. When the differential pressure transmitter 5 in this embodiment is negative, that is, the pressure at the medium output end 102 is greater than the pressure at the medium input end 101, it proves that the turbine shaft seal medium is flowing in reverse or is in a load shedding condition, and there is no need to provide medium output. Therefore, the corresponding valve and heater 17 can be closed by controlling the control box 18.

[0033] Specifically: when the differential pressure transmitter 5 is positive and the first temperature sensor 2 has not reached the preset value, the direction of medium flow is determined to be positive. At this time, the heater 17 starts heating normally to achieve automatic temperature control and over-temperature protection.

[0034] When the differential pressure transmitter 5 reads negative and the first temperature sensor 2 reaches a preset value, it is determined that the medium flow direction is reversed, and the heater 17 stops heating. During reverse flow, the hot medium ensures that the heater 17 remains hot. When the medium changes from reverse flow to forward flow, the heater 17 starts. Under turbine load shedding conditions, the heater 17 can also be stopped by reversing the medium flow.

[0035] In an exemplary embodiment, a first valve 6 is provided on the medium pipe 1 for connecting the medium input end 101 and the medium output end 102, and a first temperature sensor 2 is provided on the medium pipe 1 near the medium input end 101. The first valve 6 and the first temperature sensor 2 are electrically connected to the control box 18.

[0036] In this embodiment, the first valve 6 can separate the medium input end 101 and the medium output end 102, or connect the medium input end 101 and the medium output end 102. The first temperature sensor 2 can sense the temperature of the medium at the medium input end 101, so as to control the heating power of the heater 17 through the control box 18.

[0037] For example, in this embodiment, a host computer is provided, which can provide feedback and display the data of the first temperature sensor 2 in real time. In this embodiment, the first temperature sensor 2 can sense the temperature at the medium input terminal 101 in real time.

[0038] For example, in this embodiment, there are two first temperature sensors 2 to avoid damage to one of the first temperature sensors 2.

[0039] In one exemplary embodiment, the heater 17 is provided with an input pipe 7 communicating with the medium output terminal 102. The medium in the medium pipe 1 enters the heater 17 through the input pipe 7. The input pipe 7 is provided with a second valve 8, which is electrically connected to the control box 18. Simultaneously, the heater 17 is provided with an output pipe 11 communicating with the medium output terminal 102. The medium in the heater 17 enters the medium output terminal 102 through the output pipe 11. The output pipe 11 is provided with a third valve 13 and a second temperature sensor 12. The third valve 13 and the second temperature sensor 12 are electrically connected to the control box 18.

[0040] In this embodiment, the input pipe 7 and output pipe 11 enable the medium from the medium input terminal 101 to be fed into the heater 17 or the medium heated in the heater 17 to be fed into the medium output terminal 102 for output. The second valve 8 and the third valve 13 ensure that the medium can be fed into the heater 17 or output to the medium output terminal 102 only when certain conditions are met. Both the second valve 8 and the third valve 13 are electrically connected to the control box 18, enabling automatic operation.

[0041] For example, an armored heat tracing cable is configured outside the housing of heater 17 to maintain the temperature of heater 17 and ensure that heater 17 is always kept hot. This ensures that heater 17 starts up hot and that the heat is fully used for heating the medium. The armored heat tracing cable is automatically temperature-controlled by control box 18 and can realize over-temperature protection.

[0042] Specifically, when a positive flow of medium enters the heater 17 device from the shaft sealing system, the entire heater 17 device starts heating. During this stage, the second valve 8 opens, while the first valve 6 and the third valve 13 close, allowing the medium to flow into the heater 17. Since the third valve 13 is closed, the medium cannot flow into the downstream pipeline. When the second temperature sensor 12 reaches the set value, the third valve 13 opens to a certain extent, for example, 1 / 3, allowing a small portion of the hot medium to flow into the downstream pipeline. When the first temperature sensor 2 reaches the set value, it indicates that the medium in the heater 17 has been fully heated and reaches a stable temperature. At this point, the third valve 13 fully opens, and the medium flows normally into the medium output terminal 102.

[0043] In one exemplary embodiment, the heating device for the shaft seal system of a solar thermal power plant further includes a drainage system disposed on the heater 17.

[0044] In this embodiment, due to the existing structure of the heating equipment, the drainage mechanism has a high failure rate and fails to achieve automatic drainage function over a long period. Furthermore, the heater 17 is located at a lower position in the shaft seal steam system, making it extremely easy for water to accumulate in the casing of the heater 17. This water accumulation seriously affects the safe operation of the system. By setting up a drainage system, excessive condensate in the heating device can be avoided, preventing damage to the heater 17 caused by the inability to drain it in time.

[0045] For example, the drainage system includes a level gauge 14 and a drainage mechanism respectively installed on the heater 17. The level gauge 14 is used to detect condensate in the heater 17. The input end of the drainage mechanism is connected to the internal space of the heater 17 and is used to drain the condensate in the heater 17. In this embodiment, the drainage mechanism includes a drain valve 15 and a drain valve 16. The drain valve 15 is installed on the heater 17, and its input end is connected to the interior of the heater 17. The input end of the drain valve 15 is also connected to the interior of the heater 17. The drain valve 16 and the drain valve 15 are connected in parallel to the interior of the heater 17. In a specific embodiment, the level gauge 14 monitors the liquid level in the heater 17 housing in a timely manner. Under normal use, the drain valve 15 is closed, and the water in the heater 17 housing is directly discharged through the drain valve 16. When the liquid level reaches a set value under abnormal operating conditions, the control system outputs a control signal to open the automatic drain valve 15, thereby timely and effectively draining the water in the heater 17 housing to meet the requirements of safe system operation.

[0046] For example, the steam trap 16 is a mechanical steam trap with automatic drainage and steam isolation functions. Under normal operation, the steam trap 16 can meet the usage requirements.

[0047] In an exemplary embodiment, a first connecting pipe 3 is provided between the medium input terminal 101 and the second valve 8, and the free end of the first connecting pipe 3 is connected to the differential pressure transmitter 5. A second connecting pipe 4 is provided between the third valve 13 and the medium output terminal 102, and the free end of the second connecting pipe 4 is connected to the differential pressure transmitter 5.

[0048] In this embodiment, the pressure data of the medium input terminal 101 and the medium output terminal 102 can be transmitted to the differential pressure transmitter 5 through the first connecting pipe 3 and the second connecting pipe 4 respectively, and the data can be synchronized to the control box 18 so that the control box 18 can determine whether the current pressure difference is positive or negative.

[0049] For example, in this embodiment, the first connecting pipe 3 can be disposed at the medium input end 101 of the medium pipe 1 or on the input pipe 7. Similarly, in this embodiment, the second connecting pipe 4 can be disposed at the medium output end 102 of the medium pipe 1 or on the output pipe 11.

[0050] In one exemplary embodiment, the heater 17 is provided with a safety valve 10 and a pressure transmitter 9.

[0051] In this embodiment, the safety valve 10 installed on the heater 17 can automatically open under specific conditions to discharge the medium from the heater 17, ensuring that the heater 17 operates under normal conditions. The pressure transmitter 9 installed can monitor the pressure inside the heater 17 in real time, improving the safety performance of the equipment.

[0052] Specific implementation steps:

[0053] First, heater 17 is put into heating mode. The medium to be heated is input through the medium input terminal 101 of medium pipe 1. At this time, differential pressure transmitter 5 is positive, second valve 8 is open, and first valve 6 and third valve 13 are closed, allowing the medium to flow into heater 17. Since third valve 13 is closed, the medium cannot flow into the downstream pipeline. When second temperature sensor 12 reaches the set value, third valve 13 is opened to a certain extent, for example, 1 / 3, allowing a small portion of the hot medium to flow into the downstream pipeline. When first temperature sensor 2 reaches the set value, it indicates that the medium in heater 17 has been fully heated and reaches a stable temperature. Third valve 13 is then fully opened, and the medium flows normally to the medium output terminal 102 for output. When differential pressure transmitter 5 is negative and first temperature sensor 2 reaches the preset value, it is determined that the medium flow direction is reversed, and heater 17 stops heating. When the medium flows in reverse, the hot medium ensures that heater 17 remains hot. When the medium changes from reverse flow to forward flow, heater 17 restarts, thus achieving automatic control of the normal operation of the entire heating system.

[0054] In summary, this utility model can meet the requirements of comprehensive monitoring functions, real-time automatic control, rapid heating, and automatic start-stop according to the medium flow direction, creating favorable conditions for the efficient, stable, and safe operation of steam turbine units.

[0055] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A heating device for a shaft sealing system in a solar thermal power plant, characterized in that, include: A medium tube, comprising a medium input end and a medium output end, wherein the medium input end and the medium output end are isolated from each other, and a differential pressure transmitter is provided on the medium tube for detecting the pressure difference between the medium input end and the medium output end; a heater, wherein the heater is respectively connected to the medium input end and the medium output end, and is used to heat the medium in the medium tube; and a control box, wherein the control box is electrically connected to the differential pressure transmitter and the heater.

2. The heating device for the shaft sealing system of a solar thermal power plant according to claim 1, characterized in that: The medium pipe is provided with a first valve for connecting the medium input end and the medium output end, and the medium pipe is provided with a first temperature sensor located near the medium input end. The first valve and the first temperature sensor are electrically connected to the control box.

3. The heating device for the shaft sealing system of a solar thermal power plant according to claim 1, characterized in that: The heater is provided with an input pipe that communicates with the medium output end. The medium in the medium pipe enters the heater through the input pipe. The input pipe is provided with a second valve, which is electrically connected to the control box.

4. The heating device for the shaft sealing system of a solar thermal power plant according to claim 3, characterized in that: The heater is provided with an output pipe that communicates with the medium output end. The medium in the heater enters the medium output end through the output pipe. The output pipe is provided with a third valve and a second temperature sensor. The third valve and the second temperature sensor are electrically connected to the control box.

5. The heating device for the shaft sealing system of a solar thermal power plant according to claim 1, characterized in that: The heating device for the shaft sealing system of the solar thermal power plant also includes a drainage system, which is installed on the heater.

6. The heating device for the shaft sealing system of a solar thermal power plant according to claim 5, characterized in that: The hydrophobic system includes a level gauge and a hydrophobic mechanism respectively installed on the heater. The level gauge is used to detect condensate in the heater, and the input end of the hydrophobic mechanism is connected to the internal space of the heater and is used to drain the condensate in the heater.

7. The heating device for the shaft sealing system of a solar thermal power plant according to claim 6, characterized in that: The drainage mechanism includes a drain valve and a drain valve. The drain valve is disposed in the heater, and the input end of the drain valve is connected to the interior of the heater. The input end of the drain valve is also connected to the interior of the heater.

8. The heating device for the shaft sealing system of a solar thermal power plant according to claim 4, characterized in that: A first connecting pipe is provided between the medium input end and the second valve, and the free end of the first connecting pipe is connected to the differential pressure transmitter. A second connecting pipe is provided between the third valve and the medium output end, and the free end of the second connecting pipe is connected to the differential pressure transmitter.

9. The heating device for the shaft sealing system of a solar thermal power plant according to claim 1, characterized in that: The heater is equipped with a safety valve.

10. The heating device for the shaft sealing system of a solar thermal power plant according to claim 1, characterized in that: The heater is equipped with a pressure transmitter.

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