Liquid nitrogen intercepting system

Abstract

The utility model relates to the technical field of pipeline maintenance, in particular to a liquid nitrogen intercepting system which comprises a fluid pipeline, a liquid nitrogen bottle, a liquid nitrogen pipeline connected with the liquid nitrogen bottle and a control device. The middle section of the liquid nitrogen pipeline is a bent pipeline arranged around the fluid pipeline in an embracing mode, the bent pipeline comprises a plurality of C-shaped pipelines which are sequentially arranged from top to bottom, arc-shaped connectors used for connection are arranged between the head ends and the tail ends of every two adjacent C-shaped pipelines, and gaps are reserved between the arc-shaped connectors at the head ends and the tail ends of the C-shaped pipelines; a first temperature sensor is fixedly arranged at the installation position, corresponding to the bent pipeline in the liquid nitrogen pipeline, of the fluid pipeline, and a second temperature sensor is fixedly arranged at the outlet position of the liquid nitrogen pipeline; according to the scheme, the technical problem that the fluid freezing efficiency of an existing liquid nitrogen cooling system is not high can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline maintenance technical field, concretely is liquid nitrogen intercepts flow system. BACKGROUND

[0002] Although fluid transportation by pipeline has the advantages of low cost, high efficiency, small transportation loss and controllable risk, etc., the pipeline is prone to blockage in the long-term use process, which brings many challenges to the normal operation of the pipeline. The pipeline blockage is usually caused by the gradual accumulation of solid particles, impurities, sediments, etc. in the fluid in the inner wall of the pipeline or the elbow of the pipeline over time, resulting in a decrease in the flow cross section of the pipeline and a blockage of the fluid flow. For example, in oil and gas pipelines, the impurities such as wax and sand in crude oil will gradually deposit and form blockage; in chemical pipelines, due to the complexity of the medium, such as containing solid particles, corrosion products, etc., it will also cause pipeline blockage.

[0003] Therefore, it is necessary for the staff to timely dredge and repair the pipeline. For production lines in industrial production that rely on pipeline transportation of fluid, pipeline dredging will cause production interruption, affecting production progress and output. For urban water supply, gas supply and other pipeline systems, water and gas stop during pipeline dredging will cause inconvenience to residents' daily life. The prior art discloses a pipeline repair method and device (publication number: CN114526397A), which utilizes liquid nitrogen vaporization refrigeration technology to freeze and block the damaged pipeline according to the position of the damaged pipeline, thereby repairing the damaged pipeline without cutting off the entire network water distribution.

[0004] However, the existing technology has the technical problem that the freezing efficiency of the frozen thawing sleeve on the pipeline is not high, and the reason is that the flow path of liquid nitrogen in the sleeve is short and the flow velocity distribution is uneven. Moreover, the sleeve can only be wrapped on a straight pipe and cannot be adjusted and bent according to the actual installation space requirements. UTILITY MODEL CONTENTS

[0005] The utility model provides liquid nitrogen intercepts flow system, can solve the technical problem that the efficiency of freezing fluid of prior art liquid nitrogen cooling system is not high.

[0006] The present application provides the following technical solutions:

[0007] The liquid nitrogen intercepting system comprises a fluid pipeline, a liquid nitrogen bottle, a liquid nitrogen pipeline connected with the liquid nitrogen bottle, and a control device. The middle section of the liquid nitrogen pipeline is a curved pipeline wrapped around the fluid pipeline. The curved pipeline comprises a plurality of C-shaped pipelines arranged from top to bottom. Arc-shaped joints are arranged between the leading ends and trailing ends of adjacent two C-shaped pipelines for connection. Gaps are left between the arc-shaped joints on the leading ends and trailing ends of the C-shaped pipelines. A first temperature sensor is fixedly arranged on the fluid pipeline at a position corresponding to the curved pipeline of the liquid nitrogen pipeline. A second temperature sensor is fixedly arranged at an outlet position of the liquid nitrogen pipeline.

[0008] Advantages:

[0009] 1. Improved efficiency of frozen fluid: The spiral-shaped channel composed of multiple C-shaped pipelines and arc-shaped joints makes the flow path of liquid nitrogen in the pipeline longer, increasing the contact area between liquid nitrogen and the inner wall of the pipeline. According to the basic principle of heat exchange, the larger the contact area, the higher the heat exchange efficiency. When liquid nitrogen flows in the spiral pipe, it can more fully absorb the heat of the inner wall of the pipeline, thereby more effectively reducing the temperature in the pipeline. Due to the long path of the spiral pipe, the residence time of liquid nitrogen in the pipeline is relatively long, which allows liquid nitrogen to exchange heat with the thermal energy in the pipeline for a longer time, further improving the cooling effect. In contrast, the linear structure of the sleeve makes the flow path of liquid nitrogen shorter and the residence time shorter, resulting in relatively low heat exchange efficiency. This improvement greatly improves the efficiency and reliability of frozen plugging.

[0010] 2. Enhanced installation flexibility: The gaps between the arc-shaped joints on the leading ends and trailing ends of the C-shaped pipelines, rather than completely closing the fluid pipeline, allow the liquid nitrogen pipeline to be adjusted and bent according to the actual installation space and requirements. In some space-limited or obstacle-avoiding situations, the flexibility of the spiral pipe allows it to better adapt to complex installation environments. Traditional sleeves, which are usually linear in structure, require a larger space and a straight path for installation, and have relatively low flexibility. This design not only solves the problem of inconvenient installation in the prior art, but also expands the application scenarios of the system, improving its applicability in different environments.

[0011] 3. Precise control of the system through real-time monitoring: Workers can monitor the temperature conditions detected by the first temperature sensor and the second sensor to determine the freezing condition of the fluid and whether to adjust the flow rate or flow of liquid nitrogen to ensure the efficiency of frozen fluid. This real-time monitoring mechanism ensures precise control of the freezing process, avoids problems caused by insufficient or excessive cooling, and improves the safety and effectiveness of the operation. Users can dynamically adjust the liquid nitrogen supply parameters based on temperature data to ensure optimal freezing effect and reduce unnecessary energy waste.

[0012] Further, as an improvement, the control device includes a valve and a water pump arranged on the liquid nitrogen pipe, and a controller for controlling the opening and closing of the valve and the operation of the water pump.

[0013] Beneficial effects: The most prominent effect of this improvement is to enhance the controllability and efficiency of the liquid nitrogen shutoff system. By introducing a controller to manage the opening and closing of the valve and the operation of the water pump, users can accurately control the flow rate and flow of liquid nitrogen, ensuring optimal freezing effect.

[0014] Further, as an improvement, the control device further includes an external power source for providing power to the valve and the first temperature sensor, and the power source is electrically connected to the valve, temperature sensor, and water pump through wires.

[0015] Beneficial effects: The most prominent effect of this improvement is to enhance the reliability and operational flexibility of the system. By using an external independent power source, all key components such as the valve, temperature sensor, and water pump can obtain stable power supply, ensuring normal operation of the system. By placing the power source on the ground rather than underground, the risk of electrical failure caused by the humid or complex underground environment is avoided, and daily inspection and maintenance are also facilitated. If the power source needs to be replaced or repaired, workers can directly operate on the ground without the need to dig or enter underground space, greatly simplifying the maintenance process and improving work efficiency.

[0016] Further, as an improvement, it further includes a water pumping device, which includes a second water pump and a water pumping pipeline connected to the outlet of the second water pump.

[0017] Beneficial effects: The most prominent effect of this improvement is to solve the problem of accumulated water during the cooling process, ensuring the dryness and safety of the working environment. By introducing a special water pumping device, accumulated water caused by temperature changes during the liquid nitrogen freezing and plugging process can be pumped out in time, avoiding safety hazards such as slippery working area or electrical equipment short circuit caused by accumulated water. In addition, keeping the working area dry not only improves the operational convenience and safety of workers, but also prevents potential damage to underground structures or surrounding facilities.

[0018] Further, as an improvement, the curved pipe in the liquid nitrogen pipeline is made of 304 stainless steel.

[0019] Beneficial effects: 304 stainless steel has excellent low-temperature resistance and good mechanical strength, which can maintain good toughness and strength in extremely low-temperature environment and is not prone to brittle fracture, which can adapt to the ultra-low temperature environment of liquid nitrogen at -196℃.

[0020] Further, as an improvement, a temperature gauge for displaying temperature values is electrically connected to the first temperature sensor.

[0021] The most prominent effect of this improvement is to provide intuitive and instant temperature feedback, greatly facilitating the operation and monitoring of the staff. By directly connecting the temperature meter on the first temperature sensor, the staff can view the temperature changes in the fluid pipeline in real time and adjust the flow rate or flow of liquid nitrogen in a timely manner as needed to ensure the efficiency of the optimal freezing liquid nitrogen. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a top view of the liquid nitrogen intercepting system of the first embodiment of the utility model;

[0023] Figure 2 is a top view of the liquid nitrogen intercepting system of the first embodiment of the utility model; Figure 1 is an A-A sectional view of the liquid nitrogen intercepting system of the first embodiment of the utility model;

[0024] Figure 3 is an A-A sectional view of the liquid nitrogen intercepting system of the first embodiment of the utility model; Figure 2 is an enlarged schematic view of the B position in the liquid nitrogen intercepting system of the first embodiment of the utility model. DETAILED DESCRIPTION

[0025] The following will be further described in detail through specific embodiments:

[0026] The marks in the drawings of the specification include: fluid pipeline 100, liquid nitrogen bottle 200, liquid nitrogen pipeline 300, C-shaped pipeline 301, arc-shaped joint 302, electromagnetic valve 400, first water pump 500, power supply 600, probe 700, temperature meter 701, second temperature sensor 800, second water pump 900, water pumping pipeline 901.

[0027] Embodiment one

[0028] As shown in the first embodiment of the utility model, the liquid nitrogen intercepting system comprises a fluid pipeline 100, a liquid nitrogen bottle 200, a liquid nitrogen pipeline 300 connected with the liquid nitrogen bottle 200, and a control device. Figures 1-3 The fluid pipeline 100 is buried underground, and the fluid pipeline 100 has a wide range of applications in industry and daily life and is the main tool for transporting fluids such as liquids and gases. For example, the water pipeline transports water from the water source to the user's home, and the oil and gas pipeline transports oil and gas from the production site to the processing or use site. The place where the fluid pipeline 100 is blocked can be any segment of the fluid pipeline 100.

[0029]

[0030] ​The liquid nitrogen bottle 200 is placed on the ground, and the liquid nitrogen pipeline 300 is connected to the outlet of the liquid nitrogen bottle 200, which creates conditions for the liquid nitrogen to flow around the fluid pipeline 100. A control device is arranged at the inlet of the liquid nitrogen pipeline 300, which includes an electromagnetic valve 400 and a first water pump 500 mounted on the liquid nitrogen pipeline 300, a controller for controlling the opening and closing of the electromagnetic valve 400 and the operation of the first water pump 500, and an external power supply 600 for providing power for the valve and the first and second temperature sensors 800. The controller is integrated on the power supply 600, and the power supply 600 is electrically connected to the valve, the first temperature sensor, and the first water pump 500 by wires. The first water pump 500 is responsible for pumping the liquid nitrogen in the liquid nitrogen bottle 200 into the liquid nitrogen pipeline 300, and the electromagnetic valve 400 is used to control the opening and closing of the liquid nitrogen pipeline 300.

[0031] The middle section of the liquid nitrogen pipeline 300 is a curved pipeline wrapped around the fluid pipeline 100, which is made of 304 stainless steel and can maintain good toughness and strength in extremely low temperature environment. The curved pipeline includes a plurality of C-shaped pipelines 301 arranged from top to bottom, and arc-shaped joints 302 are arranged between the leading ends and trailing ends of adjacent two C-shaped pipelines 301 for connection. Gaps are left between the leading ends and trailing ends of the C-shaped pipelines 301, so that the staff can arbitrarily twist the C-shaped pipelines 301 to wrap the liquid nitrogen pipeline 300 around the fluid pipeline 100.

[0032] A first temperature sensor is fixedly arranged on the fluid pipeline 100 at a position corresponding to the curved pipeline of the liquid nitrogen pipeline 300, and a second temperature sensor 800 is fixedly arranged at the outlet position of the liquid nitrogen pipeline 300. Specifically, the sensing end of the first temperature sensor is three waterproof temperature probes 700 tightly attached to the outer surface of the fluid pipeline 100, and a temperature table 701 for displaying temperature values is electrically connected to the first and second temperature sensors 800 respectively to facilitate the staff to check the cooling and freezing conditions; the waterproof temperature probes 700 are clamped between the arc-shaped probes 700 at the leading ends and trailing ends of the C-shaped pipelines 301 to achieve clamping and fixing without the need for special fixing devices. The second temperature sensor 800 is used to monitor the temperature of the output liquid nitrogen to determine whether the flow rate or flow of the liquid nitrogen needs to be increased to maintain the frozen state in the fluid pipeline 100.

[0033] The water pumping device includes a second water pump 900 and a water pumping pipeline 901 connected to the outlet of the second water pump 900. The second water pump 900 is placed at the bottom of the pit below the fluid pipeline 100. Since the temperature of the liquid nitrogen is very low, water droplets will condense and fall to the bottom of the pit during the cooling process of the fluid pipeline 100. If the maintenance time is longer, the water droplets will easily accumulate into a water pool, and at this time the water pumping device is needed to timely drain the water accumulated at the bottom of the pit.

[0034] The specific application process is as follows:

[0035] In use, first, the position of the fluid pipeline 100 blockage is determined, the fluid pipeline 100 blockage position can be determined by the existing technology in the acoustic detection method, pressure pulse wave method and other commonly used detection method. Then the liquid nitrogen pipeline 300 is surrounded on the front section of the fluid pipeline 100 blockage position, and the temperature probe 700 in the first temperature sensor is clamped and fixed on the outer surface of the fluid pipeline 100 by using the arc-shaped joint 302 on the liquid nitrogen pipeline 300. Then the power supply 600 is connected, the water pump 500 and the electromagnetic valve 400 are opened by operating the controller, so that the liquid nitrogen in the liquid nitrogen bottle 200 is injected into the liquid nitrogen pipeline 300 to flow, and the flow of the liquid nitrogen will freeze the fluid in the fluid pipeline 100 surrounded by the curved pipeline to achieve the effect of cutting off. It is worth mentioning that the staff should pay attention to the temperature monitored by the first temperature sensor and the second sensor to judge the freezing condition of the fluid and whether it is necessary to adjust the flow rate or flow of the liquid nitrogen to ensure the freezing efficiency of the fluid.

[0036] The above is only an embodiment of the present application, the present application is not limited to this embodiment. The specific structure and characteristics of the scheme and other common knowledge in the art are not described in detail. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and other records in the specification can be used to explain the content of the claims.

Claims

1. A liquid nitrogen interception system, characterized in that: Includes fluid pipelines, liquid nitrogen cylinders, liquid nitrogen pipelines connected to the liquid nitrogen cylinders, and control devices; The middle section of the liquid nitrogen pipeline is a curved pipe that surrounds the fluid pipeline. The curved pipe includes several C-shaped pipes arranged sequentially from top to bottom. An arc-shaped connector is provided between the beginning and end of two adjacent C-shaped pipes for connection. A gap is left between the arc-shaped connectors at the beginning and end of the C-shaped pipes. A first temperature sensor is fixedly installed on the fluid pipeline at the installation position corresponding to the bend in the liquid nitrogen pipeline, and a second temperature sensor is fixedly installed at the outlet position of the liquid nitrogen pipeline.

2. The liquid nitrogen interception system according to claim 1, characterized in that: The control device includes a valve and a first water pump mounted on a liquid nitrogen tube, and a controller for controlling the opening and closing of the valve and the operation of the first water pump.

3. The liquid nitrogen interception system according to claim 2, characterized in that: The control device also includes an external power supply for providing power to the valve and temperature sensor, the power supply being electrically connected to the valve, the first temperature sensor, and the water pump via wires.

4. The liquid nitrogen interception system according to claim 3, characterized in that: It also includes a pumping device, which includes a second pump and a pumping pipe connected to the outlet of the second pump.

5. The liquid nitrogen interception system according to claim 4, characterized in that: The curved pipes in the liquid nitrogen pipeline are made of 304 stainless steel.

6. The liquid nitrogen interception system according to claim 5, characterized in that: A temperature gauge for displaying temperature values ​​is electrically connected to the first temperature sensor.

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