CN110984124B - Spiral liquid nitrogen freezer and method - Google Patents
Spiral liquid nitrogen freezer and method Download PDFInfo
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- CN110984124B CN110984124B CN201911124410.6A CN201911124410A CN110984124B CN 110984124 B CN110984124 B CN 110984124B CN 201911124410 A CN201911124410 A CN 201911124410A CN 110984124 B CN110984124 B CN 110984124B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/11—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means
- E02D3/115—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means by freezing
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- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
A spiral liquid nitrogen freezer and a method are suitable for artificial freezing construction of underground engineering. The spiral air return pipe comprises a liquid supply pipe and an air return pipe which are of a spiral structure, the liquid supply pipe and the air return pipe are connected with each other and provided with a liquid supply pipe opening and an air return pipe opening, and the tail ends of a spiral coil of the liquid supply pipe and a spiral coil of the air return pipe are connected with each other, arranged in a staggered mode and not in direct contact with each other. The loss of cold energy is less, and the characteristic of quick freezing of liquid nitrogen is fully exerted. The refrigerating fluid is directly close to the stratum to be frozen, so that the transmission efficiency of the refrigerating fluid to the stratum is improved, and the advantage of high refrigerating efficiency of the liquid nitrogen is exerted. The spiral liquid nitrogen freezer can be directly applied to stratum freezing projects of different depths, the freezing effect of different depth positions is controlled by adjusting the interval between spiral pipes, and different freezing of different depths is realized.
Description
Technical Field
The invention relates to a spiral liquid nitrogen freezer and a method thereof, in particular to a spiral liquid nitrogen freezer and a method thereof which are suitable for artificial freezing construction of underground engineering.
Background
In the process of urban underground engineering construction, when complex geological conditions such as a soft and weak water-sand-rich soil layer are crossed, a manual freezing technology is often adopted to reinforce the stratum and improve the stratum performance so as to complete the construction of underground engineering in a water-bearing stratum, and liquid nitrogen freezing is used as an efficient and time-saving freezing method and widely applied to municipal underground engineering. The liquid nitrogen freezer used in the freezing of liquid nitrogen at present is constructed by inserting a liquid supply pipe with a small diameter into the interior of a steel freezing pipe to form a freezing circulation system. When the liquid nitrogen is frozen, low-temperature liquid nitrogen is poured from the liquid supply pipe opening, flows into the bottom of the freezing pipe through the liquid supply pipe, absorbs heat and is gasified, the gasified high-temperature nitrogen flows upwards along the annular space between the freezing pipe and the liquid supply pipe, and is discharged into the atmosphere through the freezing pipe opening to form a freezing cycle. Because the liquid supply pipe is surrounded by the gasified high-temperature nitrogen, the liquid nitrogen flowing through the liquid supply pipe is firstly subjected to heat exchange with the surrounding high-temperature nitrogen to be gasified, when the freezing pipe is long, the heat exchange distance between the liquid nitrogen in the liquid supply pipe and the surrounding nitrogen is long, and the liquid nitrogen cannot be conveyed to the bottom of the freezing pipe by the liquid supply pipe. And the nitrogen gas discharged from the pipe orifice of the freezing pipe and the liquid nitrogen in the liquid supply pipe are directly discharged into the atmosphere after heat exchange, so that the loss of the cold energy of the liquid nitrogen is greatly increased. Aiming at the situation, a novel liquid nitrogen freezer is provided, namely a spiral liquid nitrogen freezer, and the direct heat exchange between liquid nitrogen and high-temperature nitrogen is avoided by isolating a liquid supply pipe and an air return pipe, so that the effects of long-distance liquid nitrogen conveying and cold loss reduction are realized, and the freezing efficiency of the liquid nitrogen is improved.
Disclosure of Invention
Aiming at the technical defects, the spiral liquid nitrogen freezer and the method have the advantages of simple structure, good use effect, small loss of cold energy caused by heat exchange between the liquid supply pipe and nitrogen, high liquid nitrogen freezing efficiency and convenience for long-distance liquid nitrogen conveying.
In order to achieve the technical purpose, the spiral liquid nitrogen freezer comprises a liquid supply pipe and an air return pipe, wherein one ends of the liquid supply pipe and the air return pipe are connected with each other, the other ends of the liquid supply pipe and the air return pipe are respectively provided with a liquid supply pipe opening and an air return pipe opening, wherein the liquid supply pipe and the air return pipe are of spiral structures, the liquid supply pipe is provided with a liquid supply pipe coil with the same diameter as the freezing hole, the air return pipe is provided with an air return pipe coil with the same diameter as the freezing hole, the tail ends of the coil of the liquid supply pipe and the coil of the air return pipe are mutually connected and are arranged in a staggered way without being in direct contact with each other, a plurality of supporting reinforcing steel bars for fixing the two positions are arranged between the coil of the liquid supply pipe and the coil of the air return pipe, the vertical spacing distances of the coil of the liquid supply pipe and the coil of the air return pipe at different positions are adjusted according to engineering requirements, the freezing effects of different vertical positions are controlled through different intervals, and vertical differential freezing is realized.
When the longitudinal depth of the project is 5-10 m, the thickness of the required freezing wall is 3m, and when the thickness of the required freezing wall from the ground surface to the underground is 5m, the distance between adjacent spiral coils at 0-5 m of the spiral freezer formed by the liquid supply pipe and the air return pipe is adjusted to be large, and the distance between adjacent spiral coils at 5-10 m is adjusted to be small, so that different-depth differential freezing is realized.
And the spiral coil of the liquid supply pipe on the liquid supply pipe and the air return pipe is fixedly connected with the spiral coil of the air return pipe vertically by using a supporting steel bar.
A spiral liquid nitrogen freezing method comprises the following steps:
constructing a freezing hole according to the designed size and position, processing a liquid supply pipe spiral coil and a gas return pipe spiral coil of the spiral liquid nitrogen freezer into the size matched with the freezing hole, and connecting the liquid supply pipe spiral coil and the gas return pipe spiral coil together by using a support steel bar, so that the distance between the liquid supply pipe spiral coil and the gas return pipe spiral coil is not changed in the construction process, the stability of the liquid nitrogen freezer is improved, the spiral liquid nitrogen freezer with the matched size is placed into the freezing hole, and meanwhile, the liquid supply pipe spiral coil and the gas return pipe spiral coil on the liquid supply pipe and the gas return pipe are ensured to be tightly attached to the stratum at the edge of the freezing hole, so that the cold quantity of liquid nitrogen;
when freezing, low-temperature liquid nitrogen is filled into the liquid supply pipe from the liquid supply pipe opening, the liquid nitrogen rapidly exchanges heat with the surrounding stratum in contact in the process of passing through the liquid supply pipe to realize stratum freezing, the liquid nitrogen is gasified into high-temperature nitrogen when reaching the joint with the air return pipe and flows upwards along the air return pipe, as part of the liquid nitrogen is still mixed with the gasified nitrogen, the residual liquid nitrogen continues to be gasified to absorb heat in the upwards discharging process and exchanges cold with the stratum again to transmit the cold to the stratum to realize secondary freezing, and finally the liquid nitrogen is discharged into the atmosphere through the air return pipe opening, and in the whole circulation process, no heat exchange occurs between the liquid nitrogen and the liquid nitrogen, so that the freezing efficiency of the liquid nitrogen is improved.
Has the advantages that:
according to the invention, the spiral liquid nitrogen freezer can realize direct contact between the liquid supply pipe and the stratum, so that the freezing efficiency is improved; the direct transmission of cold energy between the liquid supply pipe and the air return pipe is avoided, and the loss of the cold energy of the liquid nitrogen is reduced; the liquid nitrogen delivery of the liquid supply pipe in a long distance is realized, and the advantage of quick freezing of low-temperature liquid nitrogen is exerted; the outside does not have the shell, adopts and inserts two steel reinforcement welding in the solenoid inside and supports the reinforcement processing, and solenoid has certain support intensity similar to steel reinforcement cage in addition, and this structure has saved the outside steel pipe parcel that adopts of traditional liquid nitrogen freezer as the shell, and the advantage is that liquid nitrogen feed pipe and muffler are direct and the soil layer contact, and cold volume transmission efficiency is high, and the advantage is second in feed pipe and muffler are not in same airtight space, and the two does not have direct cold volume exchange, effectively improves and freezes efficiency.
Drawings
Fig. 1 is a schematic front view of a spiral liquid nitrogen freezer according to an embodiment of the present invention.
FIG. 2 is a schematic top view of a spiral liquid nitrogen freezer according to an embodiment of the present invention.
In the figure: 1-air return pipe mouth, 2-liquid supply pipe mouth, 3-liquid supply pipe, 4-air return pipe, 5-support reinforcing steel bar, 6-liquid supply pipe spiral coil and 7-air return pipe spiral coil.
Detailed Description
The following description of the embodiments refers to the accompanying drawings for illustrating the specific embodiments in which the invention may be practiced.
As shown in fig. 1 and 2, the spiral liquid nitrogen freezer of the present invention comprises a liquid supply pipe 3 and a gas return pipe 4, one end of the liquid supply pipe 3 and one end of the gas return pipe 4 are connected with each other, the other end is respectively provided with a liquid supply pipe orifice 2 and a gas return pipe orifice 1, wherein the liquid supply pipe 3 and the gas return pipe 4 are of a spiral structure, the liquid supply pipe 3 is provided with a liquid supply pipe coil 6 having the same diameter as the freezing hole, the gas return pipe 4 is provided with a gas return pipe coil 7 having the same diameter as the freezing hole, the liquid supply pipe coil 6 and the gas return pipe 4 are vertically fixedly connected with each other by a support steel bar 5, the tail ends of the liquid supply pipe coil 6 and the gas return pipe coil 7 are connected with each other and are arranged in a staggered manner without directly contacting with each other, a plurality of support steel bars 5 are provided between the liquid supply pipe coil 6 and the gas return pipe coil 7, the vertical spacing distance between the liquid supply pipe coil 6 and the air return pipe coil 7 at different positions is adjusted according to engineering requirements, and the freezing effect at different vertical positions is controlled through different spacing distances, so that vertical differential freezing is realized; when the required frozen wall thickness is 3m when the engineering longitudinal depth is 5-10 m, and the required frozen wall thickness is 1m from the ground surface to the underground 5m, the distance between adjacent spiral coils at 0-5 m of the spiral freezer formed by the liquid supply pipe 3 and the air return pipe 4 is adjusted to be large, and the distance between adjacent spiral coils at 5-10 m is adjusted to be small, so that different-depth differential freezing is realized.
A freezing method of a spiral liquid nitrogen freezer comprises the following steps:
constructing a freezing hole according to the designed size and position, processing a liquid supply pipe coil 6 and a gas return pipe coil 7 of the spiral liquid nitrogen freezer into the size matched with the size of the freezing hole, and connecting the two together by using a support steel bar 5, ensuring that the distance between the liquid supply pipe coil 6 and the gas return pipe coil 7 is not changed in the construction process, improving the stability of the liquid nitrogen freezer, putting the spiral liquid nitrogen freezer with the matched size into the freezing hole, and simultaneously ensuring that the liquid supply pipe coil 6 and the gas return pipe coil 7 on the liquid supply pipe 3 and the gas return pipe 4 are tightly attached to the stratum at the edge of the freezing hole so as to ensure that the cold energy of liquid nitrogen is directly transmitted into the stratum;
when freezing, low-temperature liquid nitrogen is filled into the liquid supply pipe 3 from the liquid supply pipe opening 2, the liquid nitrogen rapidly exchanges heat with the surrounding stratum in contact in the process of passing through the liquid supply pipe 3 to realize stratum freezing, the liquid nitrogen is gasified into high-temperature nitrogen at the joint of the liquid nitrogen and the air return pipe 4 and flows upwards along the air return pipe 4, as the gasified nitrogen still can be mixed with a part of liquid nitrogen, the residual liquid nitrogen can continue to be gasified to absorb heat in the upward discharging process and simultaneously exchanges cold with the stratum again to transfer the cold to the stratum to realize secondary freezing, and finally the liquid nitrogen is discharged into the atmosphere through the air return pipe opening 1, and in the whole circulation process, no heat exchange occurs between the liquid nitrogen and the liquid nitrogen, so that the freezing efficiency of the liquid nitrogen is.
Claims (4)
1. A spiral liquid nitrogen freezer is characterized in that: the freezing and freezing device comprises a liquid supply pipe (3) and an air return pipe (4), wherein one end of the liquid supply pipe (3) is connected with one end of the air return pipe (4), the other end of the liquid supply pipe is provided with a liquid supply pipe opening (2) and an air return pipe opening (1), the liquid supply pipe (3) and the air return pipe (4) are of a spiral structure, a liquid supply pipe spiral coil (6) with the same diameter as a freezing hole is arranged on the liquid supply pipe (3), an air return pipe spiral coil (7) with the same diameter as the freezing hole is arranged on the air return pipe (4), the tail ends of the liquid supply pipe spiral coil (6) and the air return pipe spiral coil (7) are connected with each other, the tail ends of the liquid supply pipe spiral coil (6) and the air return pipe spiral coil (7) are arranged in a staggered mode and are not in direct contact with each other, a plurality of supporting reinforcing steel bars (5) for fixing the liquid supply pipe spiral coil (6) and the air, the freezing effects of different vertical positions are controlled through different intervals, and vertical differential freezing is realized.
2. The spiral liquid nitrogen freezer of claim 1, wherein: when the required frozen wall thickness is 3m when the engineering longitudinal depth is 5-10 m, and the required frozen wall thickness is 1m from the ground surface to the underground 5m, the distance between adjacent spiral coils at 0-5 m of the spiral freezer formed by the liquid supply pipe (3) and the air return pipe (4) is adjusted to be large, and the distance between adjacent spiral coils at 5-10 m is adjusted to be small, so that different-depth differential freezing is realized.
3. The spiral liquid nitrogen freezer of claim 1, wherein: and the spiral ring (6) of the liquid supply pipe on the liquid supply pipe (3) and the air return pipe (4) and the spiral ring (7) of the air return pipe are fixedly connected by using a supporting steel bar (5) vertically.
4. A freezing method using the spiral liquid nitrogen freezer of claim 1, characterized by the steps of:
constructing a freezing hole according to the designed size and position, processing a liquid supply pipe coil (6) and a gas return pipe coil (7) of a spiral liquid nitrogen freezer into the size matched with the freezing hole, connecting the liquid supply pipe coil (6) and the gas return pipe coil (7) together by using a support steel bar (5), ensuring that the distance between the liquid supply pipe coil (6) and the gas return pipe coil (7) is not changed in the construction process, improving the stability of the liquid nitrogen freezer, putting the spiral liquid nitrogen freezer with the matched size into the freezing hole, and simultaneously ensuring that the liquid supply pipe coil (6) and the gas return pipe coil (7) on a liquid supply pipe (3) and a gas return pipe (4) are tightly attached to the stratum at the edge of the freezing hole so as to ensure that the cold energy of liquid nitrogen is directly transmitted to the stratum;
when freezing, low-temperature liquid nitrogen is poured into the liquid supply pipe (3) from the liquid supply pipe opening (2), the liquid nitrogen rapidly exchanges heat with the surrounding stratum in the process of passing through the liquid supply pipe (3) to freeze the stratum, the liquid nitrogen is gasified into high-temperature nitrogen when reaching the joint of the liquid nitrogen and the air return pipe (4), the high-temperature nitrogen flows upwards along the air return pipe (4), as the gasified nitrogen still can be mixed with a part of liquid nitrogen, the residual liquid nitrogen continues to be gasified to absorb heat in the upwards discharging process and simultaneously exchanges cold energy with the stratum again, the cold energy is transferred to the stratum to realize secondary freezing, and finally the liquid nitrogen is discharged into the atmosphere through the air return pipe opening (1), and in the whole circulation process, no heat exchange occurs between the liquid nitrogen and the liquid nitrogen, so that the freezing efficiency of the liquid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911124410.6A CN110984124B (en) | 2019-11-15 | 2019-11-15 | Spiral liquid nitrogen freezer and method |
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| CN201911124410.6A CN110984124B (en) | 2019-11-15 | 2019-11-15 | Spiral liquid nitrogen freezer and method |
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| CN110984124B true CN110984124B (en) | 2020-10-02 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113106964B (en) * | 2021-05-14 | 2022-08-05 | 北京中煤矿山工程有限公司 | Freezing pipe weld cracking prevention mechanism and freezing pipe weld cracking prevention method |
| CN114304135A (en) * | 2021-11-22 | 2022-04-12 | 美东汇成生命科技(昆山)有限公司 | Multifunctional freezing storage pipe |
| CN113981944A (en) * | 2021-11-24 | 2022-01-28 | 盾构及掘进技术国家重点实验室 | Double-helix liquid nitrogen freezer |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5520361A (en) * | 1978-07-31 | 1980-02-13 | Tokyo Shibaura Electric Co | Supercritical helium generator |
| CN201077982Y (en) * | 2007-09-11 | 2008-06-25 | 兖矿新陆建设发展有限公司 | Partial freezing device |
| CN102221496B (en) * | 2011-02-28 | 2012-11-07 | 西南交通大学 | Filter cake freezing device of slurry shield test system |
| CN204456065U (en) * | 2015-01-30 | 2015-07-08 | 海南大学 | A kind of X-type freezing pipe |
| CN206052685U (en) * | 2016-09-26 | 2017-03-29 | 海南大学 | Screw thread freezing pipe |
| CN107258881B (en) * | 2017-08-08 | 2023-08-29 | 浙江海洋大学 | Spiral aquatic product quick-freezing device |
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