Coal gas pipeline drain deicing method and system coupled with photovoltaic power generation

Abstract

The present application relates to photovoltaic power generation technical field, especially to a kind of coupling photovoltaic power generation's coal gas pipeline drainer anti-freezing method and system, including according to environmental temperature and preset drainer temperature lower limit, the required heating power required to maintain drainer safety is calculated;If real-time photovoltaic power generation power≥required heating power, photovoltaic power is used to supply electric heating device in full amount;If real-time photovoltaic power generation power<required heating power, photovoltaic power is output according to current maximum capacity, and the balance power is supplemented from plant grid.The present application has the advantages that: photovoltaic power generation is used as the preferred energy of electric heating, clean energy is used to drive electric heating device, reduce the dependence on plant grid, when photovoltaic power is sufficient, system is completely powered by photovoltaic;Meanwhile, energy storage device is provided to store the remaining power of photovoltaic system, when photovoltaic power generation is insufficient, supplementary power is provided by energy storage device, and grid is used as the final backup, forming triple protection.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic power generation technology, and in particular to a method and system for preventing freezing of gas pipeline drainers coupled with photovoltaic power generation. Background Technology

[0002] Gas drainers are critical safety accessories in gas pipeline networks of metallurgical, chemical, and other enterprises. They are used to continuously drain condensate from pipelines, preventing blockages and gas leaks. In northern winters, the inside of the drainer and its outlet pipes are highly susceptible to freezing, leading to water seal failure, poor drainage, gas pressure fluctuations, and even leaks. Therefore, antifreeze measures are essential for the safe operation of gas drainers.

[0003] Currently, electric heating is the most common method for antifreeze treatment.

[0004] In the prior art, application number CN202121402314.6 discloses a gas drainer with electric heating function, which reduces the occurrence of gas drainer freezing during operation through electric heating, greatly improving the practicality of the gas drainer. However, the electricity used in this patent comes from the factory's own power grid, and there is no power load regulation method, which inevitably increases the factory's electricity load and causes energy waste.

[0005] Application number CN202022533564.5 discloses a gas drainer with a built-in heater. The low-pressure chamber of the gas drainer contains a heat-conducting cylinder, which houses heat-conducting oil and an electric heating rod extending into the oil. The heater is placed in the low-pressure chamber, and the electric heating rod heats the heat-conducting oil. The heat is then transferred through the heater's outer wall to the drainer's heating chamber and other chambers. A temperature control and protection device is installed on the upper part of the heater to monitor the heat-conducting oil temperature and control the heater's power supply. The protection device automatically disconnects the power supply in case of electrical faults such as heater leakage, ensuring safe operation. While this design uses a simple temperature control switch, it fails to consider changes in ambient temperature to adjust the heating power in a timely manner, resulting in significant ineffective heating and substantial energy waste.

[0006] Application number CN201320042088.4 discloses a medium-pressure gas drainer with bottom electric heating and antifreeze function. It features an electric heating rod at the bottom of a high-level water tank and support, along with an electric heating temperature controller. The heating rod is connected to the temperature controller via wires, and the temperature controller is connected to a distribution box via wires. These components are respectively installed on the outer walls of the drainer body, the drain gas stop valve, the drain pipe, the vent pipe, and the overflow pipe. This patent achieves temperature detection at key locations of the drainer through a temperature control system, enabling the control of the electric heating system based on temperature signals. However, it does not explain the basic logic of the electric heating control signal and still raises the issue of increasing the plant's electrical load.

[0007] In summary, the existing electric heating antifreeze technology for gas drainers has the following main shortcomings: Using constant power operation or simple temperature control switch makes it difficult to dynamically adjust the heating power according to the ambient temperature and day-night changes, resulting in a large amount of ineffective heating and serious waste of electricity.

[0008] Meanwhile, existing electric heating technology relies entirely on the factory's power grid for power supply, fails to utilize renewable energy, has high operating costs, and increases the company's electricity load.

[0009] This patent provides a method for preventing freezing of gas pipeline drainers that can reduce energy consumption, optimize energy structure and achieve intelligent control, which is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0010] The purpose of this invention is to provide a method and system for preventing freezing of gas pipeline drainers coupled with photovoltaic power generation, which solves the problems of high energy consumption, crude control, and single energy structure of existing electric heating freezing solutions. This invention prioritizes photovoltaic power supply and dynamically calculates the required heating power based on ambient temperature and photovoltaic power generation capacity to achieve precise heating. When photovoltaic power is sufficient, excess electricity is stored, and when insufficient, the difference is supplemented by the power grid, thereby reducing energy consumption and operating costs, optimizing the energy structure, and ensuring the safe operation of the drainer.

[0011] To achieve the above objectives, the present invention provides the following technical solution: A method for preventing freezing of a gas pipeline drainer coupled with photovoltaic power generation includes: Collect ambient temperature and photovoltaic power generation ; According to ambient temperature and the preset lower limit of the drain temperature Calculate the required heating power to maintain the safety of the drain valve. ; Real-time photovoltaic power generation With required heating power Comparison: If the real-time photovoltaic power generation capacity ≥Required heating power The electric heating device will be powered entirely by photovoltaic electricity. If the real-time photovoltaic power generation capacity <Required heating power Then the photovoltaic power will be output at its current maximum capacity, and the difference in power will be supplemented from the power grid in the plant area.

[0012] Heating power required The expression is: ①; in: Indicates the overall heat transfer coefficient; This indicates the effective heat dissipation area of ​​the drain body and pipes. This indicates the lower limit of the drain temperature, with a range of 3–5°C above the freezing point. This represents the risk factor for freezing, with a value range of 1.1 to 2.0.

[0013] The expression for the freeze risk factor is: ②; in: This represents the weighting coefficient, with a value range of [value range missing]. ; This indicates the local wind speed, expressed in m / s. This indicates the ambient temperature, expressed in °C.

[0014] The expression for supplementing the power difference from the plant's power grid is: ②; in: P n This indicates the difference in power supplied from the plant's power grid, expressed in kW.

[0015] If photovoltaic power generation capacity ≥Required heating power When the photovoltaic power generation exceeds the required heating power, the surplus power is used to charge the energy storage device, forming a photovoltaic-storage-thermal closed-loop system.

[0016] A gas pipeline drain valve antifreeze system coupled with photovoltaic power generation includes a photovoltaic panel, an energy storage device, an inverter, and an electric heating device, which are connected in sequence. The photovoltaic panel is used to collect solar energy and convert it into electrical energy; the energy storage device is used to store excess photovoltaic power; the inverter is used to convert direct current into alternating current to provide power for the electric heating device; the electric heating device is installed on the outer surface of the valve of the gas drain valve. The electric heating device is also connected to the factory's power grid.

[0017] The valve of the gas drainer is located on the drain pipe of the gas drainer, which is used to drain the condensate in the gas pipeline.

[0018] The electric heating device is an electric heater.

[0019] It also includes thermocouples, which are installed on the gas drain valve and used to measure ambient temperature.

[0020] It also includes a control unit, which collects ambient temperature signals and photovoltaic power generation signals, calculates the required heating power, and drives the electric heating device to start and stop. The control unit includes a power drive module and a mains power supply unit; The power drive module is connected to the inverter and is used to output commands to make the photovoltaic panel prioritize providing working power to the electric heating device; The power grid supply unit is connected to the plant's power grid and the electric heating device respectively. When the photovoltaic power is insufficient, it outputs commands to make the plant's power grid supplement the electric heating device with the difference in power.

[0021] Compared with the prior art, the beneficial effects of the present invention are: 1. A thermodynamic model for electric heating of gas drainers was established. Taking into account real-time parameters such as ambient temperature and wind speed, the required heating power was dynamically calculated to achieve precise control of heating output, avoid ineffective heating, and significantly reduce energy consumption. 2. Photovoltaic power generation is the preferred energy source for electric heating. Clean energy is prioritized to drive electric heating devices, reducing dependence on the factory's power grid. When photovoltaic power is sufficient, the system is entirely powered by photovoltaics, significantly reducing the enterprise's electricity load. At the same time, energy storage devices are available to store the surplus power of the photovoltaic system. When photovoltaic power generation is insufficient, supplementary power is provided through energy storage devices, with the power grid serving as the final backup, forming a triple guarantee and improving the system's power supply stability. 3. By sequentially connecting photovoltaic panels, energy storage devices, inverters, and electric heating devices, an energy chain with photovoltaic power priority is formed. The structure is simple and easy to install directly on existing gas drainers, realizing the priority use of clean energy and reducing dependence on the plant's power grid. The electric heating device is also connected to the plant's power grid and works in conjunction with the power drive module in the control unit and the grid power supply unit to form a dual-source power supply structure of "photovoltaic priority and grid supplementation". When photovoltaic power is insufficient, it switches or supplements the difference in power to ensure continuous and reliable heating and avoid antifreeze failure due to power fluctuations. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the antifreeze system for a gas pipeline drainer coupled with photovoltaic power generation.

[0023] Figure 2 This is the power control logic diagram for a photovoltaic-coordinated electric heater.

[0024] In the diagram: 1. Photovoltaic panel; 2. Energy storage device; 3. Inverter; 4. Plant power grid; 5. Gas drainer; 6. Electric heater. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0026] The following embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the following embodiments. Unless otherwise specified, the methods used in the following embodiments are conventional methods. Example 1:

[0027] See Figure 1 A gas pipeline drainer antifreeze system coupled with photovoltaic power generation includes a photovoltaic panel 1, an energy storage device 2, an inverter 3, an electric heating device, a thermocouple, and a control unit, wherein the photovoltaic panel 1, energy storage device 2, inverter 3, and electric heating device are connected in sequence. The photovoltaic panel 1 is used to collect solar energy and convert it into electrical energy; the energy storage device 2 is used to store excess photovoltaic power; the inverter 3 is used to convert direct current into alternating current to provide power for the electric heating device; the electric heating device is installed on the outer surface of the valve of the gas drainer 5; the valve of the gas drainer 5 is located on the drain pipe of the gas drainer 5, and the gas drainer 5 is used to drain condensate from the gas pipeline; the thermocouple is located on the gas drainer 5 and is used to detect ambient temperature.

[0028] The electric heating device is also connected to the plant's power grid 4, and the electric heating device is an electric heater 6.

[0029] The control unit is used to collect ambient temperature signals and photovoltaic power generation signals, calculate the required heating power, and drive the electric heating device to start and stop. The control unit includes a power drive unit and a grid power supply unit. The power drive unit is connected to the inverter 3 and is used to output commands to make the photovoltaic panel 1 give priority to providing working power to the electric heating device. The grid power supply unit is connected to the plant grid 4 and the electric heating device respectively, and is used to output commands to make the plant grid 4 supplement the electric heating device with the difference in power when the photovoltaic power is insufficient.

[0030] See Figure 2 A method for preventing freezing of a gas pipeline drainer coupled with photovoltaic power generation, comprising: S1, Ambient Temperature and photovoltaic power generation ; Ambient temperature is collected in real time by thermocouples installed on the gas drain valve. For example, on a winter day, the ambient temperature ℃, the control unit counts the available photovoltaic power generated from the inverter. For example, the current photovoltaic power generation capacity KW.

[0031] S2, based on ambient temperature and the preset lower limit of the drain temperature Calculate the required heating power to maintain the safety of the drain valve. ; Heating power required The expression is: ①; in: The overall heat transfer coefficient is determined by the material, thickness, and structure of the drainer's insulation layer. For example, taking... W / (m 2 ·℃); This indicates the effective heat dissipation area of ​​the drain body and pipes, such as m 2 ; Indicates the lower limit of the drain valve temperature, taken as... ℃; Indicates ambient temperature, take ℃; This represents the freezing risk factor, which is dynamically adjusted based on local wind speed and temperature, and its value ranges from 1.1 to 2.0. The expression for the freeze risk factor is: ②; in: Represents the weighting coefficient, taking... ; To indicate the local wind speed, take m / s; Indicates ambient temperature, take ℃; ; The required heating power is: W≈0.71kW.

[0032] S3, Real-time photovoltaic power generation With required heating power Comparison: Photovoltaic power generation KW, required heating power ,because With sufficient photovoltaic power, the control unit instructs the power drive unit to use photovoltaic power to drive the electric heating device at full capacity, while the grid power supply module is in standby or zero output state.

[0033] Simultaneously, the surplus power generated by photovoltaic power generation beyond the required heating power is used to charge the energy storage device, forming a closed-loop photovoltaic-storage-thermal system. The surplus power is: ; The remaining power of 39.39kW is used entirely to charge the energy storage device.

[0034] Photovoltaic power generation Less than the required heating power For example, at night or in rainy weather, the photovoltaic power generation capacity... kW, then At this time, the photovoltaic power is output at its current maximum capacity, and the difference in power is supplemented from the power grid in the plant area. The difference in power is: ; An optimized strategy to prioritize photovoltaic power consumption and supplement the power gap with the power grid.

[0035] This invention establishes a thermodynamic model for the electric heating of a gas drainer, comprehensively considering real-time parameters such as ambient temperature and wind speed to dynamically calculate the required heating power, achieving precise control of heating output, avoiding ineffective heating, and significantly reducing energy consumption. It prioritizes photovoltaic power generation as the primary energy source for electric heating, utilizing clean energy to drive the electric heating device, reducing dependence on the plant's power grid. When photovoltaic power is sufficient, the system is entirely powered by photovoltaics, significantly reducing the enterprise's electricity load. Simultaneously, an energy storage device is provided to store the surplus power of the photovoltaic system. When photovoltaic power generation is insufficient, supplementary power is provided through the energy storage device, with the power grid serving as the final backup. This system employs a triple-layer protection mechanism to enhance power supply stability. By sequentially connecting photovoltaic panels, energy storage devices, inverters, and electric heating devices, a photovoltaic power-priority power supply link is formed. This simple structure allows for direct installation on existing gas drainers, prioritizing the use of clean energy and reducing reliance on the plant's power grid. The electric heating device is also connected to the plant's power grid, working in conjunction with the power drive module in the control unit and the grid power supply unit to form a dual-source power supply structure of "photovoltaic priority, grid supplementation." When photovoltaic power is insufficient, it switches or supplements the difference in power to ensure continuous and reliable heating and prevent anti-freezing failure due to power fluctuations.

Claims

1. A method for preventing freezing of a gas pipeline drainer coupled with photovoltaic power generation, characterized in that, include: Collect ambient temperature and photovoltaic power generation ; According to ambient temperature and the preset lower limit of the drain temperature Calculate the required heating power to maintain the safety of the drain valve. ; Real-time photovoltaic power generation With required heating power Comparison: If the real-time photovoltaic power generation capacity ≥Required heating power The electric heating device will be powered entirely by photovoltaic electricity. If the real-time photovoltaic power generation capacity <Required heating power Then, the photovoltaic power will be output at its current maximum capacity, and the difference in power will be supplemented from the power grid in the plant area.

2. The method for preventing freezing of a gas pipeline drainer coupled with photovoltaic power generation according to claim 1, characterized in that, The required heating power The expression is: ①； in: Indicates the overall heat transfer coefficient; This indicates the effective heat dissipation area of ​​the drain body and pipes. This indicates the lower limit of the drain temperature, with a range of 3–5°C above the freezing point. This represents the risk factor for freezing, with a value range of 1.1 to 2.

0.

3. The method for preventing freezing of a gas pipeline drainer coupled with photovoltaic power generation according to claim 2, characterized in that, The expression for the aforementioned freezing risk factor is: ②； in: This represents the weighting coefficient, with a value range of [value range missing]. ; This indicates the local wind speed, expressed in m / s. This indicates the ambient temperature, expressed in °C.

4. The method for preventing freezing of a gas pipeline drainer coupled with photovoltaic power generation according to claim 1, characterized in that, The expression for supplementing the differential power from the plant's power grid is as follows: ②； in: P n This indicates the difference in power supplied from the plant's power grid, expressed in kW.

5. The method for preventing freezing of a gas pipeline drainer coupled with photovoltaic power generation according to claim 1, characterized in that, If the photovoltaic power generation capacity is as described ≥Required heating power When the photovoltaic power generation exceeds the required heating power, the surplus power is used to charge the energy storage device, forming a photovoltaic-storage-thermal closed-loop system.

6. A gas pipeline drainer antifreeze system for implementing the method of any one of claims 1-5 for coupled photovoltaic power generation, characterized in that, It includes a photovoltaic panel, an energy storage device, an inverter, and an electric heating device, which are connected in sequence. The photovoltaic panel is used to collect solar energy and convert it into electrical energy; the energy storage device is used to store excess photovoltaic power; the inverter is used to convert DC power into AC power to provide working power for the electric heating device; the electric heating device is installed on the outer surface of the valve of the gas drainer. The electric heating device is also connected to the factory's power grid.

7. The antifreeze system for a gas pipeline drainer coupled with photovoltaic power generation according to claim 6, characterized in that, The valve of the gas drainer is located on the drain pipe of the gas drainer, and the gas drainer is used to drain the condensate in the gas pipeline.

8. The antifreeze system for a gas pipeline drainer coupled with photovoltaic power generation according to claim 6, characterized in that, The electric heating device is an electric heater.

9. A gas pipeline drain antifreeze system coupled with photovoltaic power generation according to claim 6, characterized in that, It also includes thermocouples, which are installed on the gas drain valve and used to measure ambient temperature.

10. A gas pipeline drain antifreeze system coupled with photovoltaic power generation according to claim 6, characterized in that, It also includes a control unit, which collects ambient temperature signals and photovoltaic power generation signals, calculates the required heating power, and drives the electric heating device to start and stop. The control unit includes a power drive module and a mains power supply unit; The power drive module is connected to the inverter and is used to output commands to make the photovoltaic panel prioritize providing working power to the electric heating device; The power grid supply unit is connected to the plant's power grid and the electric heating device respectively. When the photovoltaic power is insufficient, it outputs commands to make the plant's power grid supplement the electric heating device with the difference in power.

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