Super-long-distance steam pipe network heat preservation control system and method based on new energy storage

Abstract

The invention discloses an ultra-long-distance steam pipe network heat preservation control system and method based on new energy storage. The system comprises an ultra-long-distance steam pipe network, a plurality of vertical axis wind turbine units distributed along the steam pipe network, a photovoltaic array installed on the same framework with the steam pipe network, a plurality of battery energy storage units distributed, a plurality of fused salt heat storage units distributed, a plurality of distributed electric heating compensation units and a plurality of heat exchange compensation units. And an energy management platform. And the energy management platform dynamically adjusts the heating power of the distributed electric heating compensation unit and the heat exchange compensation unit and performs multi-mode cooperative thermal compensation on the steam pipe network.

Description

Technical Field

[0001] The present invention relates to the field of heat transmission technology, and in particular to an ultra-long distance steam pipeline network insulation control system and method based on new energy storage. Background Art

[0002] The coupled development of comprehensive utilization of nuclear energy and high-energy-consuming industries will further highlight the zero-carbon value of nuclear energy and can meet the diverse energy needs of high-energy-consuming industries. Using nuclear power steam in high-energy-consuming industries such as the petrochemical industry to reduce carbon emissions is a key issue in solving energy waste. It can be seen that the existing steam pipeline compensation heating technology mostly relies on the booster stations or secondary boilers added along the pipeline, which has the defects of high energy consumption, complex operation and maintenance, and large carbon emissions. The prior art CN201720142747.X discloses a heating device for heating and pressurizing long-distance thermal pipes. The thermal pipes are heated by solar collectors, batteries, and heating sleeves. However, this technical solution has the defect of being greatly affected by the weather, resulting in large heat losses. Therefore, how to ensure stable and efficient steam pipeline compensation heating under the premise of reducing energy consumption and carbon emissions is a problem that needs to be solved urgently in this field. Summary of the Invention

[0003] The present invention provides an ultra-long-distance steam pipeline network insulation control system based on new energy storage. The system includes an ultra-long-distance steam pipeline network, multiple vertical axis wind turbines distributed along the steam pipeline network, a photovoltaic array installed on the same frame as the steam pipeline, multiple distributed battery energy storage units, multiple distributed molten salt heat storage units, multiple distributed electric heating compensation units, multiple heat exchange compensation units, and an energy management platform.

[0004] The vertical axis wind turbine is connected to the energy management platform through an AC / DC rectifier, and the photovoltaic array is connected to the energy management platform through an MPPT controller and a DC / DC booster. The energy management platform is also connected to the AC grid.

[0005] The energy management platform is connected to the battery energy storage unit through a bidirectional DC / DC controller. The energy management platform is connected to the molten salt heat storage unit and the distributed electric heating compensation unit. The molten salt heat storage unit is connected to the heat exchange compensation unit.

[0006] Furthermore, during the high temperature period during the day, the energy management platform allocates the power output by the vertical axis wind turbines and photovoltaic arrays to the distributed electric thermal compensation unit, and stores the excess power in the battery energy storage unit. When the battery energy storage unit reaches a fully charged state, the energy management platform stores the excess power in the molten salt thermal storage unit.

[0007] Furthermore, the battery energy storage unit includes a lithium battery pack and a supercapacitor pack. When the energy management platform detects the power gradient of the vertical axis wind turbine and photovoltaic array output power The supercapacitor group is started to output power to the distributed electrothermal compensation unit to achieve instantaneous response, and the lithium battery group is started to discharge at a constant current to output power to the distributed electrothermal compensation unit to compensate for the power gap caused by the sudden drop in the output power of the vertical axis wind turbine and / or photovoltaic array. When the output voltage of the supercapacitor group and the lithium battery group is lower than their respective threshold voltages and the output power of the vertical axis wind turbine and the photovoltaic array still maintains the power gradient When the power is distributed from the AC grid to the distributed electric thermal compensation unit, the energy management platform will allocate power to the vertical axis wind turbine and photovoltaic array output power.

[0008] Furthermore, during nighttime low-temperature periods, the energy management platform allocates power from the vertical-axis wind turbines to distributed electric-thermal compensation units and stores excess power in battery energy storage units. Once the battery energy storage units are fully charged, the energy management platform transfers the excess power to the molten salt thermal storage units. Simultaneously, the energy management platform controls the molten salt pumps in the molten salt thermal storage units, pumping the molten salt to the heat exchange compensation units to provide constant-power temperature compensation for the steam network, thereby compensating for the significant heat loss during nighttime low-temperature periods.

[0009] Furthermore, the energy management platform dynamically adjusts the heating power of the distributed electric heating compensation units and the heat exchange compensation units, performs multimodal collaborative thermal compensation on the steam network, and gives priority to compensating the power of the electric heating compensation units and the heat exchange compensation units far away from the steam network inlet.

[0010] Furthermore, the electrothermal compensation unit includes carbon fiber electric heating cables that are equidistantly arranged in sections in the steam pipe; and the heat exchange compensation unit includes shell and tube heat exchangers that are equidistantly arranged in sections in the steam pipe.

[0011] The present invention also relates to a method for controlling the thermal insulation of an ultra-long-distance steam pipe network based on new energy storage. The method is used for the aforementioned ultra-long-distance steam pipe network thermal insulation control system based on new energy storage. During the daytime high temperature period, the method comprises the following steps:

[0012] S11. The energy management platform allocates power from the vertical-axis wind turbines and photovoltaic arrays to the distributed electric thermal compensation units and stores excess power in the battery energy storage units. When the battery energy storage units are fully charged, the energy management platform stores the excess power in the molten salt thermal storage units.

[0013] S12. If the energy management platform detects a power gradient between the vertical axis wind turbine and the photovoltaic array output power Then the supercapacitor group is started to output power to the distributed electrothermal compensation unit to achieve instantaneous response, and at the same time the lithium battery group is started to discharge at a constant current to output power to the distributed electrothermal compensation unit;

[0014] S13. If the energy management platform detects the power gradient of the vertical axis wind turbine and photovoltaic array output power Then execute step S11; if the output voltage of the supercapacitor group and the lithium battery group is lower than the respective threshold voltage and the output power of the vertical axis wind turbine and the photovoltaic array still maintains the power gradient Then execute step S14;

[0015] S14. The energy management platform allocates power from the AC grid to the distributed electric thermal compensation unit, and then to the power gradient of the vertical axis wind turbine and photovoltaic array output power. Then repeat step S11;

[0016] During the nighttime low temperature period, the method comprises the following steps:

[0017] S21. The energy management platform allocates power from the vertical-axis wind turbines to the distributed electric thermal compensation units and stores excess power in the battery energy storage units. When the battery energy storage units are fully charged, the energy management platform stores the excess power in the molten salt thermal storage units. The energy management platform controls the molten salt pump in the molten salt thermal storage units to pump the molten salt to the shell-and-tube heat exchanger for constant power temperature compensation of the steam network.

[0018] S22. If the energy management platform detects a power gradient in the output power of the vertical axis wind turbine Then the supercapacitor group is started to output power to the distributed electrothermal compensation unit to achieve instantaneous response, and at the same time the lithium battery group is started to discharge at a constant current to output power to the distributed electrothermal compensation unit;

[0019] S23. If the energy management platform detects a power gradient in the output power of the vertical axis wind turbine Then execute step S21; if the output voltage of the supercapacitor group and the lithium battery group is lower than the respective threshold voltage and the output power of the vertical axis wind turbine still maintains the power gradient Then execute step S24;

[0020] S24. The energy management platform allocates power from the AC grid to the distributed electric thermal compensation unit, and then to the vertical axis wind turbine, outputting power gradients. Then step S21 is repeated.

[0021] Furthermore, the energy management platform allocates power to the distributed electric heating compensation units. Specifically, the energy management platform dynamically adjusts the heating power of the distributed electric heating compensation units, performs multi-modal collaborative thermal compensation on the steam network, and prioritizes power compensation for electric heating compensation units and heat exchange compensation units far from the steam network inlet.

[0022] The dynamic adjustment of the heating power of the distributed electrothermal compensation unit specifically includes controlling the power Q of the i-th electrothermal compensation unit counted from the pipeline inlet. i ,

[0023]

[0024] Among them, Q set is the same power reference value output to each electrothermal compensation unit, ΔQ is the power adjustment value, β is the control coefficient, x i is the shortest pipe length from the i-th electrothermal compensation unit counting from the pipe inlet to the steam inlet of the pipe network, and N is the number of electrothermal compensation units.

[0025] The present invention also relates to a computer program product, which includes a computer program. The computer program is executed by a processor to execute the above-mentioned ultra-long distance steam pipeline insulation control method based on new energy storage.

[0026] The present invention also relates to a computer-readable storage medium, which is used to store a computer program. The computer program is executed by a processor to execute the above-mentioned ultra-long distance steam pipeline insulation control method based on new energy storage.

[0027] The technical solution of the present invention dynamically adjusts the heating power of distributed electric heating compensation units and heat exchange compensation units through an energy management platform, and performs multi-modal collaborative thermal compensation on the steam pipeline network, thereby ensuring stable and efficient steam pipeline compensation heating while reducing energy consumption and carbon emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural block diagram of an ultra-long-distance steam pipeline insulation control system based on new energy storage in the present invention. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to the accompanying drawings. The following examples are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present invention.

[0030] Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention pertains. It should be noted that the terms used herein are intended only to describe specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] Example 1 of the present invention relates to an ultra-long distance steam pipe network insulation control system based on new energy storage, as shown in the attached Figure 1 As shown, the system includes an ultra-long-distance steam pipeline network, multiple vertical-axis wind turbines distributed along the steam pipeline network, a photovoltaic array installed on the same frame as the steam pipeline, multiple distributed battery energy storage units, multiple distributed molten salt heat storage units, multiple distributed electric heating compensation units, multiple heat exchange compensation units, and an energy management platform.

[0032] The vertical-axis wind turbine is connected to the energy management platform via an AC / DC rectifier. The photovoltaic array is connected to the energy management platform via an MPPT controller and a DC / DC booster. The energy management platform is also connected to the AC grid. The energy management platform is connected to the battery energy storage unit via a bidirectional DC / DC controller. The energy management platform is also connected to the molten salt thermal storage unit and the distributed electric thermal compensation unit. The molten salt thermal storage unit is connected to the heat exchange compensation unit.

[0033] During the high temperature period during the day, the energy management platform allocates the power output of the vertical axis wind turbines and photovoltaic arrays to the distributed electric thermal compensation unit, and stores the excess power in the battery energy storage unit. When the battery energy storage unit reaches a full charge, the energy management platform stores the excess power in the molten salt thermal storage unit.

[0034] The battery energy storage unit includes a lithium battery pack and a supercapacitor pack. When the energy management platform detects the power gradient of the vertical axis wind turbine and photovoltaic array output power The supercapacitor group is started to output power to the distributed electrothermal compensation unit to achieve instantaneous response, and the lithium battery group is started to discharge at a constant current to output power to the distributed electrothermal compensation unit to compensate for the power gap caused by the sudden drop in the output power of the vertical axis wind turbine and / or photovoltaic array. When the output voltage of the supercapacitor group and the lithium battery group is lower than their respective threshold voltages and the output power of the vertical axis wind turbine and the photovoltaic array still maintains the power gradient When the power is distributed from the AC grid to the distributed electric thermal compensation unit, the energy management platform will allocate power to the vertical axis wind turbine and photovoltaic array output power.

[0035] During nighttime low-temperature periods, the energy management platform allocates power from the vertical-axis wind turbines to the distributed electric-thermal compensation units and stores excess power in the battery energy storage units. Once the battery energy storage units are fully charged, the energy management platform transfers the excess power to the molten salt thermal storage units. Simultaneously, the energy management platform controls the molten salt pumps in the molten salt thermal storage units, pumping the molten salt to the heat exchange compensation units to provide constant-power temperature compensation for the steam network, thereby compensating for the significant heat loss during nighttime low-temperature periods.

[0036] The energy management platform dynamically adjusts the heating power of the distributed electric heating compensation unit and the heat exchange compensation unit, performs multi-modal collaborative thermal compensation on the steam network, and gives priority to compensating the power of the electric heating compensation unit and the heat exchange compensation unit far away from the steam network inlet.

[0037] The electric heating compensation unit includes carbon fiber electric heating cables that are arranged in equal distance sections in the steam pipe.

[0038] The heat exchange compensation unit includes a shell and tube heat exchanger which is arranged in equal distance sections in the steam pipeline.

[0039] Example 2 of the present invention relates to an ultra-long distance steam pipeline network insulation control method based on new energy storage, which is used for an ultra-long distance steam pipeline network insulation control system based on new energy storage as described in Example 1.

[0040] During the daytime high temperature period, the method includes the following steps:

[0041] S11. The energy management platform allocates the power output by the vertical axis wind turbines and photovoltaic arrays to the distributed electric thermal compensation units, and stores the excess power in the battery energy storage units. When the battery energy storage units are fully charged, the energy management platform stores the excess power in the molten salt thermal storage units.

[0042] S12. If the energy management platform detects a power gradient between the vertical axis wind turbine and the photovoltaic array output power The supercapacitor group is started to output power to the distributed electrothermal compensation unit to achieve instantaneous response, and at the same time, the lithium battery group is started to discharge at a constant current to output power to the distributed electrothermal compensation unit.

[0043] S13. If the energy management platform detects the power gradient of the vertical axis wind turbine and photovoltaic array output power Then execute step S11; if the output voltage of the supercapacitor group and the lithium battery group is lower than the respective threshold voltage and the output power of the vertical axis wind turbine and the photovoltaic array still maintains the power gradient

[0044] Then execute step S14.

[0045] S14. The energy management platform allocates power from the AC grid to the distributed electric thermal compensation unit, and then to the power gradient of the vertical axis wind turbine and photovoltaic array output power. Then step S11 is repeated.

[0046] During the nighttime low temperature period, the method includes the following steps:

[0047] S21. The energy management platform allocates the power output by the vertical-axis wind turbine to the distributed electric thermal compensation unit and stores the excess power in the battery energy storage unit. When the battery energy storage unit reaches a full charge, the energy management platform stores the excess power in the molten salt heat storage unit. The energy management platform controls the molten salt pump in the molten salt heat storage unit to pump the molten salt to the shell-and-tube heat exchanger to provide constant power temperature compensation for the steam network.

[0048] S22. If the energy management platform detects a power gradient in the output power of the vertical axis wind turbine The supercapacitor group is started to output power to the distributed electrothermal compensation unit to achieve instantaneous response, and at the same time, the lithium battery group is started to discharge at a constant current to output power to the distributed electrothermal compensation unit.

[0049] S23. If the energy management platform detects a power gradient in the output power of the vertical axis wind turbine Then execute step S21; if the output voltage of the supercapacitor group and the lithium battery group is lower than the respective threshold voltage and the output power of the vertical axis wind turbine still maintains the power gradient Then execute step S24.

[0050] S24. The energy management platform allocates power from the AC grid to the distributed electric thermal compensation unit, and then to the vertical axis wind turbine, outputting power gradients. Then step S21 is repeated.

[0051] In the above method, the energy management platform allocates electricity to the distributed electric heating compensation units, specifically including: the energy management platform dynamically adjusts the heating power of the distributed electric heating compensation units, performs multi-modal collaborative thermal compensation on the steam network, and gives priority to compensating power to the electric heating compensation units and heat exchange compensation units far away from the steam network entrance.

[0052] The dynamic adjustment of the heating power of the distributed electrothermal compensation unit specifically includes controlling the power Q of the i-th electrothermal compensation unit counted from the pipeline inlet. i ,

[0053]

[0054] Among them, Q setis the same power reference value output to each electrothermal compensation unit, ΔQ is the power adjustment value, β is the control coefficient, x i is the shortest pipe length from the i-th electrothermal compensation unit counting from the pipe inlet to the steam inlet of the pipe network, and N is the number of electrothermal compensation units.

[0055] Embodiment 3 of the present invention relates to a computer program product, which includes a computer program. The computer program is executed by a processor to execute the insulation control method of an ultra-long-distance steam pipeline network based on new energy storage in embodiment 2.

[0056] Embodiment 4 of the present invention relates to a computer-readable storage medium, which is used to store a computer program. The computer program is executed by a processor to execute an ultra-long-distance steam pipeline insulation control method based on new energy storage in embodiment 2.

[0057] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be considered as the scope of protection of the present invention.

Claims

1. An ultra-long distance steam pipe network insulation control system based on new energy storage, characterized in that: The system includes an ultra-long-distance steam pipeline network, multiple vertical-axis wind turbines distributed along the steam pipeline network, a photovoltaic array installed on the same frame as the steam pipeline, multiple distributed battery energy storage units, multiple distributed molten salt heat storage units, multiple distributed electric heating compensation units, multiple heat exchange compensation units, and an energy management platform. The vertical axis wind turbine is connected to the energy management platform through an AC / DC rectifier, and the photovoltaic array is connected to the energy management platform through an MPPT controller and a DC / DC booster. The energy management platform is also connected to the AC grid. The energy management platform is connected to the battery energy storage unit through a bidirectional DC / DC controller. The energy management platform is connected to the molten salt heat storage unit and the distributed electric heating compensation unit. The molten salt heat storage unit is connected to the heat exchange compensation unit.

2. The ultra-long distance steam pipe network insulation control system based on new energy storage according to claim 1 is characterized in that: During the high temperature period during the day, the energy management platform allocates the power output of the vertical axis wind turbines and photovoltaic arrays to the distributed electric thermal compensation unit, and stores the excess power in the battery energy storage unit. When the battery energy storage unit reaches a full charge, the energy management platform stores the excess power in the molten salt thermal storage unit.

3. The ultra-long distance steam pipe network insulation control system based on new energy storage according to claim 2 is characterized in that: The battery energy storage unit includes a lithium battery pack and a supercapacitor pack. When the energy management platform detects the power gradient of the vertical axis wind turbine and photovoltaic array output power The supercapacitor group is started to output power to the distributed electrothermal compensation unit to achieve instantaneous response, and the lithium battery group is started to discharge at a constant current to output power to the distributed electrothermal compensation unit to compensate for the power gap caused by the sudden drop in the output power of the vertical axis wind turbine and / or photovoltaic array. When the output voltage of the supercapacitor group and the lithium battery group is lower than their respective threshold voltages and the output power of the vertical axis wind turbine and the photovoltaic array still maintains the power gradient When the power is distributed from the AC grid to the distributed electric thermal compensation unit, the energy management platform will allocate power to the vertical axis wind turbine and photovoltaic array output power.

4. The ultra-long distance steam pipe network insulation control system based on new energy storage according to claim 1 is characterized in that: During nighttime low-temperature periods, the energy management platform allocates power from the vertical-axis wind turbines to the distributed electric-thermal compensation units and stores excess power in the battery energy storage units. Once the battery energy storage units are fully charged, the energy management platform transfers the excess power to the molten salt thermal storage units. Simultaneously, the energy management platform controls the molten salt pumps in the molten salt thermal storage units, pumping the molten salt to the heat exchange compensation units to provide constant-power temperature compensation for the steam network, thereby compensating for the significant heat loss during nighttime low-temperature periods.

5. An ultra-long distance steam pipe network insulation control system based on new energy storage according to any one of claims 1 to 4, characterized in that: The energy management platform dynamically adjusts the heating power of the distributed electric heating compensation unit and the heat exchange compensation unit, performs multi-modal collaborative thermal compensation on the steam network, and gives priority to compensating the power of the electric heating compensation unit and the heat exchange compensation unit far away from the steam network inlet.

6. An ultra-long distance steam pipe network insulation control system based on new energy storage according to any one of claims 1 to 4, characterized in that: The electric heating compensation unit includes carbon fiber electric heating cables that are arranged in equal distance sections in the steam pipeline; the heat exchange compensation unit includes shell and tube heat exchangers that are arranged in equal distance sections in the steam pipeline.

7. A method for controlling the thermal insulation of an ultra-long-distance steam pipe network based on new energy storage, the method being used for the thermal insulation control system of an ultra-long-distance steam pipe network based on new energy storage as claimed in any one of claims 1 to 6, characterized in that: During the daytime high temperature period, the method includes the following steps: S11. The energy management platform allocates power from the vertical-axis wind turbines and photovoltaic arrays to the distributed electric thermal compensation units and stores excess power in the battery energy storage units. When the battery energy storage units are fully charged, the energy management platform stores the excess power in the molten salt thermal storage units. S12. If the energy management platform detects a power gradient between the vertical axis wind turbine and the photovoltaic array output power Then the supercapacitor group is started to output power to the distributed electrothermal compensation unit to achieve instantaneous response, and at the same time the lithium battery group is started to discharge at a constant current to output power to the distributed electrothermal compensation unit; S13. If the energy management platform detects the power gradient of the vertical axis wind turbine and photovoltaic array output power Then execute step S11; if the output voltage of the supercapacitor group and the lithium battery group is lower than the respective threshold voltage and the output power of the vertical axis wind turbine and the photovoltaic array still maintains the power gradient Then execute step S14; S14. The energy management platform allocates power from the AC grid to the distributed electric thermal compensation unit, and then to the power gradient of the vertical axis wind turbine and photovoltaic array output power. Then repeat step S11; During the nighttime low temperature period, the method comprises the following steps: S21. The energy management platform allocates power from the vertical-axis wind turbines to the distributed electric thermal compensation units and stores excess power in the battery energy storage units. When the battery energy storage units are fully charged, the energy management platform stores the excess power in the molten salt thermal storage units. The energy management platform controls the molten salt pump in the molten salt thermal storage units to pump the molten salt to the shell-and-tube heat exchanger for constant power temperature compensation of the steam network. S22. If the energy management platform detects a power gradient in the output power of the vertical axis wind turbine Then the supercapacitor group is started to output power to the distributed electrothermal compensation unit to achieve instantaneous response, and at the same time the lithium battery group is started to discharge at a constant current to output power to the distributed electrothermal compensation unit; S23. If the energy management platform detects a power gradient in the output power of the vertical axis wind turbine Then execute step S21; if the output voltage of the supercapacitor group and the lithium battery group is lower than the respective threshold voltage and the output power of the vertical axis wind turbine still maintains the power gradient Then execute step S24; S24. The energy management platform allocates power from the AC grid to the distributed electric thermal compensation unit, and then to the vertical axis wind turbine, outputting power gradients. Then step S21 is repeated.

8. The method for controlling thermal insulation of an ultra-long distance steam pipe network based on new energy storage according to claim 7, characterized in that: The energy management platform allocates power to distributed electric heating compensation units. Specifically, the energy management platform dynamically adjusts the heating power of distributed electric heating compensation units, performs multi-modal collaborative thermal compensation on the steam network, and prioritizes power compensation for electric heating compensation units and heat exchange compensation units far from the steam network inlet. The dynamic adjustment of the heating power of the distributed electrothermal compensation unit specifically includes controlling the power Q of the i-th electrothermal compensation unit counted from the pipeline inlet. i , Among them, Q set is the same power reference value output to each electrothermal compensation unit, ΔQ is the power adjustment value, β is the control coefficient, x i is the shortest pipe length from the i-th electrothermal compensation unit counting from the pipe inlet to the steam inlet of the pipe network, and N is the number of electrothermal compensation units.

9. A computer program product, characterized in that The computer program product includes a computer program, which is executed by a processor and is used to execute the ultra-long-distance steam pipeline insulation control method based on new energy storage as described in claim 7 or 8.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium is used to store a computer program, and the computer program is executed by a processor to execute the ultra-long-distance steam pipeline insulation control method based on new energy storage as described in claim 7 or 8.

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