CN204829088U - System that natural gas buried pipeline prevented frostbite and expands based on photovoltaic hydrologic cycle - Google Patents

Abstract

The utility model relates to a system for preventing frost heaving of buried natural gas pipelines based on photovoltaic water circulation. The system includes a photovoltaic water circulation loop and a photovoltaic power generation device connected to each other. The photovoltaic water circulation loop includes a pipeline heat exchanger, a water tank, a circulating water pump and Photovoltaic hot water assembly, the pipeline heat exchanger is in contact with the buried natural gas pipeline for heat exchange, the water tank is respectively connected to the pipeline heat exchanger, circulating water pump and photovoltaic water heating assembly through water pipes, and the photovoltaic power generation device and Photovoltaic hot water module connection. Compared with the prior art, the utility model has the advantages of anti-frost heave, good effect, high photovoltaic utilization rate and high practicability.

Description

A system for preventing frost heaving of buried natural gas pipelines based on photovoltaic water circulation

technical field

The utility model relates to the field of natural gas pipeline transportation, in particular to a system for preventing frost heaving of buried natural gas pipelines based on photovoltaic water circulation.

Background technique

During the transportation of natural gas in the high-pressure pipeline network, the pressure of natural gas is relatively high (for example, the second line of the West-East Gas Pipeline is generally 8-12MPa). 4MPa) demand, it is necessary to adjust the pressure at the distribution station. After the high-pressure natural gas is regulated by the pressure regulating valve, the pressure will decrease, and the temperature will suddenly drop below the freezing point due to the Joule-Thomson effect. Especially in winter, it will cause the soil around the buried natural gas pipeline to freeze after pressure regulation, and the phenomenon of "frost heave" will occur.

Frost heaving of pipelines will cause cracks in part of the ground and walls, and some pipelines will be deformed under the action of frost heaving load, and even the valve body of the natural gas pipeline will leave the valve seat, resulting in natural gas leakage, which will greatly affect the safe operation of the distribution station . Therefore, effective measures must be taken to solve the problem of frost heaving to ensure the safe operation of the distribution station.

Among the methods currently available to solve the problem of natural gas frost heave, the most common methods are soil replacement, waterproofing or drainage. These methods reduce the possibility of frost heave by reducing the moisture in the soil, but these methods cannot completely Solve the problem of frost heave. There is also the pipe trench method, which is to build waterproof cement pipes around the natural gas pipeline. However, this method does not perform heat exchange on the natural gas pipeline, and the cooling capacity is not taken away. Therefore, the natural gas pipeline in contact with the soil outside the distribution station will still absorb the heat of the soil and still cause soil frost heaving; at the same time, the most commonly used The most common method is to install an electric heater before the pressure regulating valve of the natural gas pipeline. Since the minimum amount in the heating process is uncertain, the fixed heating method causes energy waste; The method of frost heaving position, this method does not consume high-grade electric energy and heats the soil near the natural gas pipeline relatively uniformly, but during the implementation of this method, the heat exchange between the underground heat and the low-temperature pipeline is relatively slow, which may be due to the fact that the natural gas pipeline does not receive timely geothermal heat Compensation still causes pipeline frost heave.

In summary, it can be found that high-pressure natural gas produces a large amount of cold energy during the pressure regulation process, and because the cooling capacity of natural gas pipelines is not taken away in time, pipeline frost heaves will occur, while solar energy, as a pollution-free renewable energy , how to provide a system based on the principle of fully utilizing solar energy, through reasonable process design can not only solve the problem of frost heaving of buried natural gas pipelines, but also realize energy saving and reduce the use of high-grade electric energy. issues that need to be addressed urgently.

Utility model content

The purpose of this utility model is to provide an anti-frost-heave system for buried natural gas pipelines based on photovoltaic water circulation, which has the advantages of anti-frost heave, good effect, high photovoltaic utilization rate and high practicability in order to overcome the defects of the above-mentioned prior art.

The purpose of this utility model can be achieved through the following technical solutions:

A system for preventing frost heaving of buried natural gas pipelines based on photovoltaic water circulation, the system includes interconnected photovoltaic water circulation loops and photovoltaic power generation devices, and the photovoltaic water circulation loop includes pipeline heat exchangers, water tanks, circulating water pumps and photovoltaic hot water components , the pipeline heat exchanger is in contact with the buried natural gas pipeline for heat exchange, the water tank is connected to the pipeline heat exchanger, the circulating water pump and the photovoltaic water heating module through water pipes respectively, and the photovoltaic power generation device and the photovoltaic water heating module connect.

The photovoltaic hot water module includes a glass layer and an insulation layer in which serpentine water pipes are arranged sequentially from outside to inside, and air is filled between the glass layer and the insulation layer, and the serpentine water pipes are arranged in the insulation layer, and are connected with The water tank is connected.

The photovoltaic power generation device includes a photovoltaic cell, a storage battery, a controller, a heater and a temperature sensor arranged in the water tank, the photovoltaic cell is arranged on the surface of the thermal insulation layer, and the photovoltaic cell, the storage battery and the heater are connected in sequence , the controller is respectively connected with the heater and the temperature sensor.

A plurality of serpentine heat exchange tubes are arranged inside the pipeline heat exchanger, and the serpentine heat exchange tubes are arranged along the outer edge of the buried natural gas pipeline in turn, and communicate with the water pipes in the photovoltaic water circulation loop.

The outlet of the pipeline heat exchanger, the inlet of the circulating water pump, and the water inlet and outlet of the photovoltaic hot water module are all provided with flow regulating valves, and the flow regulating valves are connected with the controller.

Compared with the prior art, the utility model has the following advantages:

1. Anti-frost heave, good effect: In the thermal cycle, the system makes full use of solar energy to heat the circulating water, and then the circulating water fully exchanges heat with the low-temperature pipeline, effectively solving the problem of frost heave of the buried natural gas pipeline.

2. High photovoltaic utilization rate: while the photovoltaic hot water module heats the circulating water, the photovoltaic cells in it generate electricity under the sun's irradiation and store it in the electricity storage and photovoltaic control equipment. At night or when the light is insufficient, the stored electricity The electric energy provides electric energy for the electric heater in the water tank to heat the cold water, ensuring stable and continuous heat compensation for the buried natural gas pipeline.

3. High practicability: Based on the principle of making full use of solar energy, energy saving is realized through reasonable process design, reducing the use of high-grade electric energy, and reducing energy consumption throughout the process. For preventing frost heaving of buried natural gas pipelines after pressure regulation, the utility model has good energy-saving space and wider practical value.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a schematic structural diagram of a photovoltaic water heating module.

Among them, 1. Photovoltaic hot water module, 3. Water tank, 4. Circulating water pump, 5. Pipeline heat exchanger, 6. Buried natural gas pipeline, 11. Glass layer, 12. Insulation layer, 13. Serpentine water pipe, 14. Photovoltaic cell, 21, accumulator, 22, controller, 23, heater, 24, temperature sensor.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example:

As shown in Figures 1 and 2, a system for preventing frost heaving of buried natural gas pipelines based on photovoltaic water circulation includes interconnected photovoltaic water circulation loops and photovoltaic power generation devices. The photovoltaic water circulation loop includes pipeline heat exchangers 5, water tanks 3, Circulating water pump 4 and photovoltaic water heating module 1, pipeline heat exchanger 5 contacts with buried natural gas pipeline 6 for heat exchange, water tank 3 is connected to pipeline heat exchanger 5, circulating water pump 4 and photovoltaic water heating module 1 respectively through water pipes, and photovoltaic water circulation The water pipe of the loop is provided with a plurality of flow regulating valves, and the flow regulating valves are respectively arranged at the outlet of the pipeline heat exchanger 5, the inlet of the circulating water pump 4, and the water inlet and water outlet of the photovoltaic hot water module 1.

Photovoltaic hot water module 1 includes a glass layer 11 and an insulating layer 12 with serpentine water pipes 13 arranged in sequence from outside to inside. The space between the glass layer 11 and the insulating layer 12 is filled with air. 3 connected, the photovoltaic power generation device includes a photovoltaic cell 14, a storage battery 21, a controller 22, a heater 23 and a temperature sensor 24 arranged in the water tank 3, the photovoltaic cell 14 is arranged on the surface of the thermal insulation layer 12, the photovoltaic cell 14, the storage battery 21 and the The heater 23 is connected sequentially, the controller 22 is respectively connected with the heater 23 and the temperature sensor 24, and the pipeline heat exchanger 5 is provided with a plurality of serpentine heat exchange tubes, and the serpentine heat exchange tubes are sequentially along the outer edge of the buried natural gas pipeline 6 Arranged and communicated with the water pipes in the photovoltaic water circulation loop.

In order to overcome many disadvantages existing in the existing methods for solving the problem of frost heaving of buried pipelines, this utility model proposes a system for preventing frost heaving of buried natural gas pipelines based on photovoltaic water circulation, and considers using photovoltaic water heating components 1 to absorb solar energy for heating Cold water turns it into hot water. While the hot water can effectively exchange heat with the buried natural gas pipeline 6, the photovoltaic cell 14 in the photovoltaic hot water module 1 generates electricity and stores it in the battery 21. At night or when there is insufficient sunlight When the temperature of the water in the water tank is not high, the controller 22 controls the battery 21 to store electric energy to provide power support for the operation of the heater 23 in the water tank, thereby heating the cold water, ensuring that the buried natural gas pipeline 6 can obtain stable and continuous thermal compensation, It effectively solves the frost heaving problem of buried natural gas pipelines, reduces energy consumption throughout the process, and has a significant energy-saving effect.

The system design adopted by the utility model to solve its technical problems is as follows: for the heat compensation heat process of the low-temperature natural gas buried pipeline, firstly, the photovoltaic water heating module 1 absorbs solar energy, and transfers the heat to the cold water in the water tank 3 through heat conduction, After the cold water gets heat, it is heated into hot water, and under the action of the circulating water pump 4, it enters the pipeline heat exchanger 5, and the low-temperature natural gas buried pipeline 6 avoids frost heaving of the pipeline due to the heat compensation, while the hot water is A large amount of cold energy becomes cold water, which enters the photovoltaic hot water module 1 again, thereby realizing a heating cycle.

On the other hand, the photovoltaic cell 14 in the photovoltaic water heating module 1 can generate electric energy when the sun irradiates, and the electric energy sent out is stored in the storage battery 21. At night or when the light is insufficient, the stored electric energy provides the heater 23 in the water tank. The energy in turn heats the cold water.

According to the difference between day and night, the utility model makes the following adjustments to the system operation:

1. During the daytime, the flow regulating valves ①, ②, ③, ④ are opened to make full use of solar energy to heat the hot water. When the temperature of the hot water does not reach the temperature for heat exchange of the buried pipeline of low-temperature natural gas, the water tank 3 is turned on. An electric heater whose electricity is supplied by photovoltaic cells. Make full use of solar energy to heat hot water. When the temperature of hot water does not reach the temperature for exchanging heat with low-temperature natural gas buried pipelines, the electric heater in the water tank is turned on, and its electric energy is supplied by photovoltaic cells 14 .

2. At night, the flow regulating valves ① and ④ are opened, and the flow regulating valves ② and ③ are closed. The electric energy stored in the storage battery 21 is used to supply power to the electric heater to heat the cold water. When the electric energy of the battery is insufficient, the local power grid supplies power as Replenish.

The beneficial effect of the utility model is that: the utility model realizes the effective heat exchange of the natural gas buried pipeline 6 by making full use of the solar energy to heat the circulating water, and at the same time, the photovoltaic cell 14 in the photovoltaic water heating module 1 generates electric energy and stores it in the storage battery 21, at night or when there is insufficient light, the controller 22 obtains temperature information through the temperature sensor 24 in the water tank 3, and when the temperature does not meet the requirements, the stored electric energy is provided to the electric heater 23 in the water tank 3 by controlling the storage battery 21 Furthermore, the cold water is heated to ensure that the buried natural gas pipeline 6 can obtain stable and continuous heat compensation, and the energy consumption is reduced in the whole process. For preventing the frost heaving problem of the buried natural gas pipeline 6 after pressure regulation, the utility model has good energy-saving space and Broader practical value.

Claims (5)

1. the system based on the Gas Buried Pipelines anti-freeze expansion of photovoltaic water circulation, it is characterized in that, this system comprises interconnective photovoltaic water-flow circuit and photovoltaic power generation apparatus, described photovoltaic water-flow circuit comprises tube heat exchanger (5), water tank (3), circulating water pump (4) and photo voltaic hot water assembly (1), described tube heat exchanger (5) and Gas Buried Pipelines (6) contact heat-exchanging, described water tank (3) is respectively by water pipe and tube heat exchanger (5), circulating water pump (4) is connected with photo voltaic hot water assembly (1), described photovoltaic power generation apparatus is connected with photo voltaic hot water assembly (1).

2. the system of a kind of Gas Buried Pipelines anti-freeze expansion based on photovoltaic water circulation according to claim 1, it is characterized in that, described photo voltaic hot water assembly (1) comprises the glassy layer (11) and thermal insulation layer (12) that snakelike conduit (13) ecto-entad sets gradually, air is filled between described glassy layer (11) and thermal insulation layer (12), described snakelike conduit (13) is arranged in thermal insulation layer (12), and is communicated with water tank (3).

3. the system of a kind of Gas Buried Pipelines anti-freeze expansion based on photovoltaic water circulation according to claim 2, it is characterized in that, described photovoltaic power generation apparatus comprises photovoltaic cell (14), storage battery (21), controller (22) and the heater (23) be arranged in water tank (3) and temperature transducer (24), described photovoltaic cell (14) is arranged on the surface of thermal insulation layer (12), described photovoltaic cell (14), storage battery (21) is connected successively with heater (23), described controller (22) is connected with heater (23) and temperature transducer (24) respectively.

4. the system of a kind of Gas Buried Pipelines anti-freeze expansion based on photovoltaic water circulation according to claim 1, it is characterized in that, described tube heat exchanger (5) inside is provided with many snakelike heat exchange tubes, described snakelike heat exchange tube successively along Gas Buried Pipelines (6) outer rim arrangement, and with the cross current in photovoltaic water-flow circuit.

5. the system of a kind of Gas Buried Pipelines anti-freeze expansion based on photovoltaic water circulation according to claim 3, it is characterized in that, water intake and the water outlet of described tube heat exchanger (5) outlet, circulating water pump (4) entrance and photo voltaic hot water assembly (1) are equipped with flow control valve, and described flow control valve is connected with controller (22).