Long pipeline unfreezing device without determining freezing and blocking point
By introducing a methanol thawing system into the U-shaped pipeline of the long conveying pipeline, the problem of water easily freezing and blocking at the U-shaped pipeline turns in the long conveying pipeline is solved, and thawing without determining the freezing bottleneck is achieved, which improves production efficiency and reduces costs.
Patent Information
- Application Number
- CN202421335427.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-13
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-06-13
AI Technical Summary
The water at the turn of U-shaped pipelines in long conveying pipelines is prone to freezing and blocking, resulting in the hindering of the transport of water-containing liquefied gas. The existing thawing method requires stopping to check the freezing blockage, which is inefficient and costly.
A long pipeline thawing device is designed without determining the freezing bottleneck. By setting up a diversion pipeline and a methanol pipeline at the bottom of the first U-shaped pipeline of the material conveying pipeline, methanol is introduced into the U-shaped pipeline. Methanol volatilizes the gas, dissolves in water, diffuses in the conveying direction, thaws other areas, and replenishes methanol in time through a methanol content detector.
It realizes that long pipelines can be thawed without determining freezing bottlenecks at low temperatures, which improves production efficiency, reduces production costs, and prevents pipeline freezing and blockage.
Smart Images
Figure CN222669688U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pipeline transportation, in particular to a long pipeline thawing device which does not require determination of freezing and blocking points. Background Art
[0002] In industrial production, there are many U-shaped pipes in long transmission pipelines. In the process of transporting water-containing liquefied gas, especially when the flow rate of water-containing liquefied gas is low, water will accumulate at the turning points of the U-shaped pipes in the long transmission pipeline, and some of the water cannot be transported out with the water-containing liquefied gas. In winter, when the temperature drops below zero, the accumulated water at the turning points of the U-shaped pipes is prone to freezing and blocking, affecting the normal transportation of the water-containing liquefied gas. Since there are multiple U-shaped pipes in the long transmission pipeline, it is difficult to determine which U-shaped pipe is frozen after freezing. In the existing thawing technology, methanol is mostly directly introduced into the freezing point for thawing. After the long transmission pipeline is frozen, it is necessary to stop the vehicle and check the freezing points one by one before methanol can be introduced for thawing. This wastes time and reduces production efficiency. In addition, the antifreeze device is installed on each U-shaped pipe, which will also increase the production cost.
[0003] In view of the above problems in the prior art, the present invention combines many years of design and use experience in related fields to design and manufacture a long pipe thawing device that does not require the determination of the freezing point to overcome the above defects. Utility Model Content
[0004] In order to solve the problems existing in the prior art, the utility model provides a long pipeline thawing device which does not require the determination of freezing points. When transporting water-containing liquefied gas at low temperature, the long pipeline can be thawed without the need to determine the freezing points, thereby avoiding stopping to check the freezing points. It can also prevent freezing of the long pipeline, improve production efficiency and reduce production costs.
[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: a long pipeline thawing device without determining the freezing point, comprising a material conveying pipeline;
[0006] The material conveying pipeline is provided with a plurality of U-shaped pipelines. Along the material conveying direction, a guide pipeline is provided at the bottom of the first U-shaped pipeline, a methanol pipeline is connected to the guide pipeline, and the end of the methanol pipeline away from the guide pipeline is connected to a methanol storage tank. A control valve is provided on the methanol pipeline. Along the material conveying direction, after methanol is passed into the first U-shaped pipeline, the methanol gas formed by the volatilization of methanol can diffuse along the material conveying direction and dissolve in the water deposited at the bottom of the U-shaped pipeline;
[0007] Along the material conveying direction, a methanol content detector is provided in the first U-shaped pipe, and the methanol content detector signal can be transmitted to the DCS in the central control room.
[0008] Preferably, the methanol pipeline is provided with liquid conveying equipment near the methanol storage tank end.
[0009] Preferably, along the material conveying direction, the diversion pipe is provided with a pouring valve near the bottom end of the first U-shaped pipe.
[0010] Preferably, it also includes a sewage pipe, and a three-way valve is connected between the diversion pipe, the methanol pipe and the sewage pipe;
[0011] The control valve, pouring valve and three-way valve are all automatic control valves.
[0012] Preferably, the control valve, pouring valve and three-way valve are all controlled by the DCS in the central control room.
[0013] The utility model is beneficial in that:
[0014] 1. The utility model is provided with a methanol pipeline and a methanol content detector. Methanol is introduced into the first U-shaped pipeline along the material conveying direction to defrost the first U-shaped pipeline. Methanol is easily volatile to form methanol gas, which diffuses in the conveying direction driven by the water-containing liquefied gas and dissolves in water, and defrosts other areas of the material conveying pipeline, thereby realizing the thawing of the material conveying pipeline under the condition of uncertain freezing and blocking points. Methanol is introduced before the water-containing liquefied gas is conveyed, so as to prevent freezing and blocking of the material conveying pipeline. The methanol content detector detects the methanol gas content, and methanol is replenished in time through the DCS in the central control room to ensure that the material conveying pipeline will not be frozen and blocked.
[0015] 2. The utility model is easy to operate, does not need to stop the machine to check the freezing point, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 The front view of a long pipe thawing device that does not require the determination of the freezing point.
[0017] In the figure: 1-material conveying pipeline, 2-U-shaped pipeline, 3-backwash valve, 4-diversion pipeline, 5-three-way valve, 6-methanol pipeline, 7-control valve, 8-liquid conveying equipment, 9-methanol storage tank, 10-sewage pipeline. DETAILED DESCRIPTION
[0018] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.
[0019] like Figure 1As shown, a long pipeline thawing device without determining a freezing point includes a material conveying pipeline 1, wherein the material conveying pipeline 1 is provided with a plurality of U-shaped pipelines 2. Along the material conveying direction, a guide pipeline 4 is provided at the bottom of the first U-shaped pipeline 2, and a methanol pipeline 6 is connected to the guide pipeline 4. The other end of the methanol pipeline 6 is connected to a methanol storage tank 9. A control valve 7 is provided on the methanol pipeline 6. Along the material conveying direction, after methanol is introduced into the first U-shaped pipeline 2, methanol gas formed by methanol volatilization can diffuse along the material conveying direction and dissolve in water deposited at the bottom of the U-shaped pipeline 2. Along the material conveying direction, a methanol content detector is provided inside the first U-shaped pipeline 2, and the signal of the methanol content detector can be transmitted to the DCS in the central control room.
[0020] A liquid conveying device 8 is provided at the end of the methanol pipeline 6 near the methanol storage tank 9. The liquid conveying device 8 can be a pump. Along the material conveying direction, a backwash valve 3 is provided at the end of the diversion pipeline 4 near the first U-shaped pipeline 2. It also includes a sewage pipeline 10. A three-way valve 5 is connected between the diversion pipeline 4, the methanol pipeline 6 and the sewage pipeline 10. The control valve 7, the backwash valve 3 and the three-way valve 5 are all automatic control valves. The control valve 7, the backwash valve 3 and the three-way valve 5 are all controlled by the DCS in the central control room.
[0021] Specifically, the first U-shaped pipe 2 below is along the material conveying direction. The first U-shaped pipe 2 on the material conveying pipe 1 introduces methanol into the first U-shaped pipe 2. When the aqueous liquefied gas passes through, the methanol and the water in the aqueous liquefied gas are miscible, lowering the freezing point of the water. The water deposited in the first U-shaped pipe 2 will not freeze, and the methanol in the first U-shaped pipe 2 is easily volatilized from the methanol aqueous solution. The volatilized methanol gas diffuses in the conveying direction driven by the aqueous liquefied gas. While diffusing, part of the methanol gas dissolves in the water containing the aqueous liquefied gas and enters other U-shaped pipes 2 along the water. The water containing methanol stays at the bottom of the U-shaped pipe 2, and the frozen U-shaped pipe 2 is thawed at the same time. Each U-shaped pipe 2 that is easily frozen contains methanol, so there is no need to determine the freezing point. The material conveying pipeline 1 can be thawed, and methanol can be introduced before the water-containing liquefied gas is conveyed, so as to prevent the material conveying pipeline 1 from freezing and blocking. The methanol content detector in the first U-shaped pipeline 2 can transmit the methanol gas content to the DCS in the central control room. The DCS in the central control room can control the control valve 7, the pouring valve 3 and the three-way valve 5. When it is found that the methanol gas content in the first U-shaped pipeline 2 is almost no longer changed, it is considered that the methanol content in the methanol aqueous solution at the bottom of the first U-shaped pipeline 2 is small, and methanol can be conveyed to the first U-shaped pipeline 2 in time to ensure that there is always methanol in the first U-shaped pipeline 2, so that the material conveying pipeline 1 will not be frozen and blocked again. After the water-containing liquefied gas is conveyed, the liquid deposited in the first U-shaped pipeline 2 is discharged by opening the connection between the diversion pipeline 4 and the sewage pipeline 10 in the three-way valve 5.
[0022] Specific operation process
[0023] The first U-shaped pipe 2 described below is the first U-shaped pipe 2 on the material conveying pipe 1 along the material conveying direction. After the material conveying pipe 1 is frozen and blocked, the following operations are performed through the central control room DCS: open the control valve 7, the connection between the methanol pipe 6 and the diversion pipe 4 in the three-way valve 5, and the backwash valve 3. Methanol flows out from the methanol storage tank 9, and is added to the first U-shaped pipe 2 through the methanol pipe 6 by a pump. Then the backwash valve 3, the connection between the corresponding methanol pipe 6 and the diversion pipe 4 in the three-way valve 5, and the control valve 7 are closed in turn. During this process, the connection between the three-way valve 5 corresponding to the diversion pipe 4 and the sewage pipe 10 is always closed. Methanol dissolves with the water retained at the bottom of the first U-shaped pipe 2 to form a methanol aqueous solution, which lowers the freezing point. Methanol is volatile. The methanol in the methanol aqueous solution at the bottom of the first U-shaped pipe 2 evaporates. Driven by the water-containing liquefied gas, methanol Alcohol gas diffuses along the conveying direction of water-containing liquefied gas, while methanol gas dissolves in water to form methanol aqueous solution. When passing through the bottom of other U-shaped pipes 2, part of the methanol aqueous solution will be deposited at the bottom of the U-shaped pipe 2. The methanol aqueous solution has a low freezing point, and the frozen U-shaped pipe 2 is thawed, thereby thawing all frozen points in the material conveying pipe 1. The methanol content detector transmits the methanol gas content to the central control room DCS in real time. When it is found that the methanol gas content in the first U-shaped pipe 2 is almost no longer changing, it is considered that the methanol content in the methanol aqueous solution at the bottom of the first U-shaped pipe 2 is small. At this time, the control valve 7, the three-way valve 5 corresponding to the connection between the methanol pipe 6 and the diversion pipe 4, and the backwash valve 3 are reopened, and methanol is added to the first U-shaped pipe 2. Then the backwash valve 3, the connection between the three-way valve 5 corresponding to the methanol pipe 6 and the diversion pipe 4, and the control valve 7 are closed in turn.
[0024] It should be understood that the purpose of these embodiments is only to illustrate the utility model and is not intended to limit the protection scope of the utility model. In addition, it should also be understood that after reading the technical content of the utility model, those skilled in the art can make various changes, modifications and / or variations to the utility model, and all of these equivalent forms also fall within the protection scope defined by the claims attached to this application.
Claims
1. A long pipe thawing device without the need to determine the freezing point, characterized in that: It comprises a material conveying pipeline (1); The material conveying pipeline (1) is provided with a plurality of U-shaped pipelines (2). Along the material conveying direction, a guide pipeline (4) is provided at the bottom of the first U-shaped pipeline (2). The guide pipeline (4) is connected to a methanol pipeline (6). The end of the methanol pipeline (6) away from the guide pipeline (4) is connected to a methanol storage tank (9). A control valve (7) is provided on the methanol pipeline (6). Along the material conveying direction, after methanol is introduced into the first U-shaped pipeline (2), methanol gas formed by methanol volatilization can diffuse along the material conveying direction and dissolve in water deposited at the bottom of the U-shaped pipeline (2); Along the material conveying direction, a methanol content detector is provided inside the first U-shaped pipe (2), and the signal of the methanol content detector can be transmitted to the DCS in the central control room.
2. A long pipe thawing device without determining the freezing point according to claim 1, characterized in that: The methanol pipeline (6) is provided with a liquid conveying device (8) at the end close to the methanol storage tank (9).
3. A long pipe thawing device without determining the freezing point according to claim 1, characterized in that: Along the material conveying direction, the diversion pipe (4) is provided with a pouring valve (3) near the end of the first U-shaped pipe (2).
4. A long pipe thawing device without determining the freezing point according to claim 3, characterized in that: It also includes a sewage discharge pipeline (10), wherein a three-way valve (5) is connected between the diversion pipeline (4), the methanol pipeline (6) and the sewage discharge pipeline (10); The control valve (7), the pouring valve (3) and the three-way valve (5) are all automatic control valves.
5. A long pipe thawing device without determining the freezing point according to claim 4, characterized in that: The control valve (7), the pouring valve (3) and the three-way valve (5) are all controlled by the DCS in the central control room.