CN115492587A - Freezer capable of realizing multi-section differential freezing and multi-section differential freezing construction method - Google Patents
Freezer capable of realizing multi-section differential freezing and multi-section differential freezing construction method Download PDFInfo
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- CN115492587A CN115492587A CN202211175485.9A CN202211175485A CN115492587A CN 115492587 A CN115492587 A CN 115492587A CN 202211175485 A CN202211175485 A CN 202211175485A CN 115492587 A CN115492587 A CN 115492587A
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- 238000007710 freezing Methods 0.000 title claims abstract description 416
- 230000008014 freezing Effects 0.000 title claims abstract description 415
- 238000010276 construction Methods 0.000 title claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 217
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000009413 insulation Methods 0.000 claims abstract description 30
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 26
- 239000011780 sodium chloride Substances 0.000 claims abstract description 26
- 239000012267 brine Substances 0.000 claims description 50
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 50
- 230000015572 biosynthetic process Effects 0.000 claims description 11
- 150000003839 salts Chemical class 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 8
- 239000011810 insulating material Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 3
- 239000002689 soil Substances 0.000 description 18
- 238000005755 formation reaction Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000003643 water by type Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000012266 salt solution Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000001338 self-assembly Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a freezer capable of realizing multi-section differential freezing and a multi-section differential freezing construction method, wherein the freezer comprises a freezing pipe, a liquid return pipe, a waterproof heat insulation plate and a liquid inlet pipe; the freezing pipe is divided into two or more freezing sections by the waterproof heat insulation plate; one end of the liquid inlet pipe penetrates through the waterproof heat insulation plate and extends into the bottom of the freezing pipe, a check valve is arranged on part or all of the liquid inlet pipe in the freezing section above the bottommost freezing section, and a valve is arranged on part or all of the liquid inlet pipe in the bottommost freezing section; one end of the liquid return pipe penetrates through the waterproof heat insulation plate and extends into the bottommost freezing section, and a liquid return pipe saline water inlet is formed in the liquid return pipe in all freezing sections above the bottommost freezing section; the construction method is a method for realizing multi-stage differential freezing by using the freezer. The invention solves the problem that the existing freezing pipe cannot freeze according to different heat conductivity differences of the stratum.
Description
Technical Field
The invention relates to the technical field of freezing construction. In particular to a freezer capable of realizing multi-section differential freezing and a multi-section differential freezing construction method.
Background
The artificial stratum freezing method is a special stratum reinforcing technology which utilizes an artificial refrigeration technology to convert natural hydrous rock-soil into artificial frozen soil in a mode of low-temperature brine circulation in a freezing pipe so as to greatly improve the strength and stability of the original stratum, form a continuous frozen wall which can resist rock-soil pressure and effectively isolate underground water and use the continuous frozen wall as a support to carry out construction activities.
In the stratum penetrated by the freezing pipe, the freezing expansion rates of soil layers with different properties are different, and the required cold quantity and the freezing temperature are also different. Compared with the stratum with poor heat conductivity, the stratum with good heat conductivity has the advantages that the frozen wall grows faster at the same freezing temperature, so that the frozen soil curtain at the position exceeds the design requirement under the same condition, cold energy is wasted, more frost heaving force is generated, and construction safety is not facilitated.
The freezing pipes used in the prior construction are all the freezing pipes with cylindrical sections and self-assembly and adjustment lengths. A liquid supply pipe is arranged in the freezing pipe to introduce frozen salt water, and the outer wall of the freezing pipe is in contact with a soil body to realize heat exchange, so that a soil layer around the freezing pipe gradually forms a frozen soil column. The radius of the frozen soil column increases along with time, and the frozen soil column develops to a certain degree and forms a curtain after being looped. However, the freezing pipe can only perform full-section freezing at a single freezing temperature, and cannot meet the requirement of differential freezing.
There is therefore a need for a freezing tube that allows for a variety of formations and that provides different freezing temperatures in multiple freezing sections depending on the formation characteristics.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide a freezer capable of realizing multi-stage differential freezing in freezing construction and a multi-stage differential freezing construction method, so as to solve the problem that the existing freezing pipe cannot be frozen according to different heat conductivity differences of the stratum.
In order to solve the technical problems, the invention provides the following technical scheme:
the freezer capable of realizing multi-section differential freezing comprises a freezing pipe, a liquid return pipe, a waterproof heat insulation plate and two or more liquid inlet pipes; the waterproof heat-insulating plate is arranged in the freezing pipe and divides the freezing pipe into two or more freezing sections from top to bottom; one end of the liquid inlet pipe penetrates through the waterproof heat insulation plate and extends into the bottom of the freezing pipe, a check valve is arranged on the liquid inlet pipe which is partially or completely positioned in the freezing section above the bottommost freezing section, and a valve is arranged on the liquid inlet pipe which is partially or completely positioned in the bottommost freezing section; one end of the liquid return pipe penetrates through the waterproof heat insulation plate and extends into the bottommost freezing section, and a liquid return pipe saline water inlet is formed in the liquid return pipe in all freezing sections above the bottommost freezing section.
According to the freezer capable of realizing multi-section differential freezing, the freezing pipe is divided into three freezing sections, namely an upper freezing control section, a middle freezing control section and a lower freezing control section from top to bottom by the waterproof heat insulation plate;
one end of the liquid inlet pipe penetrates through the waterproof heat insulation plate and extends into the lower freezing control section, the one-way valve is arranged on the liquid inlet pipe which is partially or completely positioned in the upper freezing control section and the middle freezing control section, and the valve is arranged on the liquid inlet pipe which is partially or completely positioned in the lower freezing control section; one end of the liquid return pipe penetrates through the waterproof heat insulation plate and extends into the lower freezing control section, and a salt water inlet of the liquid return pipe is respectively arranged on the liquid return pipe in the upper freezing control section and the middle freezing control section.
According to the freezer capable of realizing multi-section differential freezing, one end of the liquid return pipe penetrates through the waterproof heat insulation plate and extends into the top of the lower freezing control section, and the saline water inlet of the liquid return pipe is respectively positioned at the top of the upper freezing control section and the top of the middle freezing control section.
The freezer capable of realizing multi-section differential freezing comprises a liquid inlet pipe, a liquid outlet pipe and a liquid outlet pipe, wherein the check valve comprises a first check valve, a second check valve, a third check valve and a fourth check valve;
one end of the first liquid inlet pipe penetrates through the waterproof heat-insulating plate and extends into the bottom of the freezing pipe, and one end of the second liquid inlet pipe penetrates through the waterproof heat-insulating plate and extends into the bottom of the freezing pipe; the first liquid inlet pipe positioned in the upper freezing control section is provided with the first one-way valve, and the first liquid inlet pipe positioned in the middle freezing control section is provided with the third one-way valve; the second liquid inlet pipe positioned in the upper part freezing control section is provided with the second one-way valve, and the second liquid inlet pipe positioned in the middle part freezing control section is provided with the fourth one-way valve; the valve is arranged on the second liquid inlet pipe in the lower freezing control section.
In the freezer capable of realizing multi-section differential freezing, the first one-way valve is arranged on the first liquid inlet pipe positioned at the inner lower part of the upper freezing control section; the third one-way valve is arranged on the first liquid inlet pipe positioned at the inner lower part of the middle freezing control section; the second one-way valve is arranged on the second liquid inlet pipe positioned at the inner lower part of the upper freezing control section; the fourth one-way valve is arranged on the second liquid inlet pipe positioned at the inner lower part of the middle freezing control section; the valve is arranged on the second liquid inlet pipe at the top in the lower freezing control section.
According to the freezer capable of realizing multi-section differential freezing, the outer pipe walls of the liquid return pipe, the first liquid inlet pipe and the second liquid inlet pipe are respectively provided with a heat insulating material.
The construction method of the multi-section difference freezing utilizes a freezer capable of realizing the multi-section difference freezing to carry out the multi-section difference freezing construction; the freezer capable of realizing multi-section differential freezing comprises a freezing pipe, a liquid return pipe, a waterproof heat-insulating plate and two or more liquid inlet pipes; the waterproof heat insulation plate is arranged in the freezing pipe and divides the freezing pipe into two or more freezing sections from top to bottom; one end of the liquid inlet pipe penetrates through the waterproof heat insulation plate and extends into the bottom of the freezing pipe, a check valve is arranged on the liquid inlet pipe which is partially or completely positioned in the freezing section above the bottommost freezing section, and a valve is arranged on the liquid inlet pipe which is partially or completely positioned in the bottommost freezing section; one end of the liquid return pipe penetrates through the waterproof heat insulation plate and extends into the bottommost freezing section, and a liquid return pipe saline water inlet is formed in the liquid return pipe in all freezing sections above the bottommost freezing section.
The construction method for the multi-section differential freezing comprises the following steps:
step A: determining the number of the liquid inlet pipes and the installation positions of the one-way valves and the valves according to the freezing requirements of different positions of the stratum to be frozen; dividing the stratum to be frozen into two or more stratum freezing areas from top to bottom;
and B: b, according to the stratum freezing area divided in the step A, adjusting the installation position of the waterproof heat insulation plate in the freezing pipe, and completing the assembly of the freezer capable of realizing multi-section differential freezing, so that the freezing sections formed in the freezing pipe in a separated mode correspond to the stratum freezing area;
and C: low-temperature brine with different temperatures is respectively conveyed into the freezing pipes through two or more than two liquid inlet pipes, and the freezing temperatures in different freezing sections are controlled by adjusting the opening and closing states of the one-way valves and the valves in the different freezing sections on the liquid inlet pipes.
In the construction method of the multi-section differential freezing, in the step A, when the number of the stratum freezing areas is 3, two waterproof heat-insulating plates are selected to divide the freezing pipe into an upper part freezing control section, a middle part freezing control section and a lower part freezing control section from top to bottom; the liquid inlet pipe comprises a first liquid inlet pipe and a second liquid inlet pipe, and the one-way valve comprises a first one-way valve, a second one-way valve, a third one-way valve and a fourth one-way valve;
in the step B, when the freezer capable of realizing multi-stage differential freezing is assembled: one end of the first liquid inlet pipe penetrates through the waterproof heat-insulating plate and extends into the bottom of the freezing pipe, and one end of the second liquid inlet pipe penetrates through the waterproof heat-insulating plate and extends into the bottom of the freezing pipe; the first check valve is arranged on the first liquid inlet pipe positioned at the inner lower part of the upper part control freezing section, and the third check valve is arranged on the first liquid inlet pipe positioned at the inner lower part of the middle part control freezing section; the second one-way valve is arranged on the second liquid inlet pipe positioned at the inner lower part of the upper freezing control section, and the fourth one-way valve is arranged on the second liquid inlet pipe positioned at the inner lower part of the middle freezing control section; the valve is arranged on the second liquid inlet pipe at the top in the lower freezing control section; one end of the liquid return pipe penetrates through the waterproof heat insulation plate and extends into the top of the lower freezing control section, and a salt water inlet of the liquid return pipe is respectively positioned at the top in the upper freezing control section and the top in the middle freezing control section.
The construction method of the multi-section difference freezing comprises the following steps:
when the desired freezing temperature of the lower freeze control zone formation is between the upper freeze control zone and the middle freeze control zone: adjusting the second, third, and valve to an open state; the low-temperature frozen brine with two temperatures respectively enters the freezing pipe through the first liquid inlet pipe and the second liquid inlet pipe and fills the upper freezing control section and the middle freezing control section; meanwhile, the low-temperature frozen brine with two temperatures is mixed in the lower control freezing section to form low-temperature frozen brine with a third temperature (the temperature of the low-temperature frozen brine with the third temperature is in the temperature range of the frozen brine of the upper control section and the frozen brine of the middle control section); the low-temperature freezing brine in the upper freezing control section, the middle freezing control section and the lower freezing control section, which completes heat exchange, respectively enters the liquid return pipe through the brine inlet of the liquid return pipe and then flows into a freezing station;
when the desired freezing temperature of the middle control freeze zone formation is between the upper control freeze zone and the lower control freeze zone: adjusting the second, third, and fourth check valves to an open state, the valves being in a closed state; the low-temperature frozen brine with two temperatures respectively enters the freezing pipe through the first liquid inlet pipe and the second liquid inlet pipe and fills the upper freezing control section and the lower freezing control section; simultaneously mixing the low-temperature frozen brines with two temperatures in the middle controlled freezing section to form a low-temperature frozen brine with a third temperature; the low-temperature freezing brine in the upper freezing control section, the middle freezing control section and the lower freezing control section, which completes heat exchange, respectively enters the liquid return pipe through the brine inlet of the liquid return pipe and then flows into a freezing station;
when the desired freezing temperature of the upper freeze control zone formation is between the middle freeze control zone and the lower freeze control zone: adjusting the first, second, and fourth check valves to an open state, the valves being in a closed state; the low-temperature frozen brine with two temperatures respectively enters the freezing pipe through the first liquid inlet pipe and the second liquid inlet pipe and fills the middle freezing control section and the lower freezing control section; simultaneously mixing the cryogenic frozen brines of the two temperatures in the upper controlled freezing section to form a cryogenic frozen brine of a third temperature; and the low-temperature freezing saline water which finishes heat exchange in the upper freezing control section, the middle freezing control section and the lower freezing control section respectively enters the liquid return pipe through the saline water inlet of the liquid return pipe and then flows into the freezing station.
The technical scheme of the invention achieves the following beneficial technical effects:
the freezer can realize multi-section differential freezing in freezing construction, realizes different temperatures of frozen brine in each section of freezing section by controlling the one-way valve and the valve on the liquid inlet pipe, and realizes the targeted freezing of strata with different heat conductivities; the freezing effect regulation and control capability and the freezing effect are better by changing the temperature, the flow speed and other measures of the frozen brine of each liquid inlet pipe in the freezing pipe. The invention can realize the differential freezing of multi-section combination, and is particularly suitable for the condition that the difference of heat conductivity, frozen soil strength and the like between different stratums exists in the whole freezing range.
Drawings
FIG. 1 is a schematic structural diagram of a freezer capable of achieving multi-stage differential freezing according to embodiment 1 of the present invention;
fig. 2 in embodiment 2 of the present invention: the flow diagram of the low-temperature brine when the required freezing temperature of the stratum of the lower freezing control section is between the upper freezing control section and the middle freezing control section;
fig. 3 in embodiment 2 of the present invention: the flow diagram of the low-temperature brine when the required freezing temperature of the stratum of the middle freezing control section is between the upper freezing control section and the lower freezing control section;
fig. 4 in embodiment 2 of the present invention: and when the required freezing temperature of the stratum of the upper freezing control section is between the middle freezing control section and the middle freezing control section, the low-temperature brine flow schematic diagram is shown.
The reference numbers in the figures denote: 1-a first liquid inlet pipe; 2-a second liquid inlet pipe; 3-a liquid return pipe; 4-freezing the tube; 5-a drill bit; 6-a valve; 7-a salt water inlet of a liquid return pipe; 8-a first one-way valve; 9-a second one-way valve; 10-a third one-way valve; 11-a fourth one-way valve; 12-waterproof and heat-insulating plate.
Detailed Description
Example 1
The structural schematic diagram of the freezer capable of realizing multi-stage differential freezing in the embodiment is shown in fig. 1: comprises a freezing pipe 4, a liquid return pipe 3, a waterproof heat-insulating plate 12, a first liquid inlet pipe 1 and a second liquid inlet pipe 2; the waterproof heat insulation plate 12 is arranged in the freezing pipe 4, and the freezing pipe 4 is divided into three freezing sections (namely, freezing areas with different temperatures) from top to bottom, namely, an upper freezing control section, a middle freezing control section and a lower freezing control section by the waterproof heat insulation plate 12; one end of a first liquid inlet pipe 1 penetrates through the waterproof heat-insulating plate 12 and extends into the bottom of the freezing pipe 4, and one end of a second liquid inlet pipe 2 penetrates through the waterproof heat-insulating plate 12 and extends into the bottom of the freezing pipe 4; a first one-way valve 8 is arranged on the first liquid inlet pipe 1 at the lower part in the upper freezing control section, and a third one-way valve 10 is arranged on the first liquid inlet pipe 1 at the lower part in the middle freezing control section; a second one-way valve 9 is arranged on the second liquid inlet pipe 2 positioned at the lower part in the upper freezing control section, and a fourth one-way valve 11 is arranged on the second liquid inlet pipe 2 positioned at the lower part in the middle freezing control section; a valve 6 is arranged on the liquid inlet pipe of the second liquid inlet pipe 2 positioned in the lower freezing control section; one end of the liquid return pipe 3 penetrates through the waterproof heat insulation plate 12 and extends into the top of the lower freezing control section, and liquid return pipe salt water inlets 7 are formed in the liquid return pipes 3 which are positioned at the top of the upper freezing control section and the top of the middle freezing control section.
In this embodiment, the first liquid inlet pipe, the second liquid inlet pipe and the liquid return pipe of the freezer capable of realizing multi-section differential freezing are all installed in the freezing pipe and parallel to the axis of the freezing pipe, and the upper end of the freezing pipe extends out of the freezing pipe; the first liquid inlet pipe and the second liquid inlet pipe are equal in length, the lower ends of the first liquid inlet pipe and the second liquid inlet pipe are located at the bottom of the lower freezing control section, and the lower end of the liquid return pipe is located at the top of the lower freezing control section; the arrangement mode ensures that the position of the liquid inlet pipe orifice of each section of the freezing control section is positioned at the bottom of the section, and the position of the liquid return pipe orifice is positioned at the top of the section, so that the full heat exchange between the low-temperature frozen brine and the surrounding stratum in each section of the freezing control section is facilitated. The setting of first check valve, second check valve, third check valve and fourth check valve can allow freezing salt solution can only follow first feed liquor pipe or second feed liquor pipe and flow into in freezing the pipe, avoids freezing salt solution to first feed liquor pipe or second feed liquor pipe backward flow.
In the embodiment, the tail ends of the first liquid inlet pipe, the second liquid inlet pipe and the liquid return pipe form a brine circulation of the lower control freezing section; the one-way valve 10 of the first liquid inlet pipe, the one-way valve 11 of the second liquid inlet pipe and the saline water return inlet 7 of the liquid return pipe form saline water circulation of a middle control freezing section; the one-way valve 8 of the first liquid inlet pipe, the one-way valve 9 of the second liquid inlet pipe and the saline water return inlet 7 of the liquid return pipe form saline water circulation of an upper control freezing section; the three parts are connected together by welding at the reserved positions to form a whole.
And thermal insulation materials are arranged on the outer pipe walls of the liquid return pipe 3, the first liquid inlet pipe 1 and the second liquid inlet pipe 2, so that the cold energy is prevented from being dissipated, and the temperature of the differential freezing control section is influenced by the cold energy diffusion when the brine circulates in the freezing pipe. The waterproof heat-insulating plate 12 is a waterproof heat-insulating plate with three holes, so that a first liquid inlet pipe, a second liquid inlet pipe and a liquid return pipe can penetrate through the waterproof heat-insulating plate; the waterproof heat insulation plate is used for fixing the positions of the liquid return pipe 3, the first liquid inlet pipe 1 and the second liquid inlet pipe 2, and the temperature of the saline water on the two sides of the waterproof heat insulation plate is guaranteed not to influence each other.
The freezing pipe in the embodiment has a simple structural form, only needs simple welding or threaded connection, is convenient for on-site splicing and installation, and is convenient for flexible lengthening according to the requirement of freezing depth.
Example 2
In this embodiment, a freezing construction site of a ground layer requiring 3 different freezing temperatures is taken as a test example, and a method of freezing construction using the multi-stage differential freezing freezer in embodiment 1 is described in further detail.
The construction method for the multi-section difference freezing in the embodiment specifically comprises the following steps:
step A: according to the freezing requirements of different positions of a stratum to be frozen, the number of liquid inlet pipes is determined to be 2, namely a first liquid inlet pipe 1 and a second liquid inlet pipe 2; the installation positions of the check valve and the valve 6 are determined at the same time, and the installation positions of the check valve and the valve 6 are detailed in embodiment 1; dividing the stratum to be frozen into 3 stratum freezing areas from top to bottom;
and B: b, adjusting the installation position of the waterproof heat-insulating plate 12 in the freezing pipe 4 according to the stratum freezing area divided in the step A, and completing the assembly of the freezer capable of realizing multi-section differential freezing, so that an upper control freezing section, a middle control freezing section and a lower control freezing section which are formed in the freezing pipe 4 in a separated mode can correspond to the stratum freezing area; the concrete structure of the freezer which can realize the multi-section differential freezing after the assembly is shown in the embodiment 1;
step C: low-temperature brine with different temperatures is respectively conveyed into a freezing pipe 4 through a first liquid inlet pipe 1 and a second liquid inlet pipe 2, and the freezing temperatures in different freezing sections are controlled by adjusting the opening and closing states of check valves and valves in different freezing sections on the first liquid inlet pipe 1 and the second liquid inlet pipe 2;
as shown in fig. 2, when the desired freezing temperature of the formation in the lower controlled freeze zone is between the upper controlled freeze zone and the middle controlled freeze zone: adjusting the second check valve 9, the third check valve 10 and the valve 6 to an open state; the low-temperature frozen brine with two temperatures respectively enters the freezing pipe 4 through the first liquid inlet pipe 1 and the second liquid inlet pipe 2 and fills the upper freezing control section and the middle freezing control section; simultaneously, the low-temperature frozen brine with two temperatures is mixed in the lower freezing control section to form low-temperature frozen brine with a third temperature; the low-temperature freezing brine which finishes heat exchange in the upper control freezing section, the middle control freezing section and the lower control freezing section respectively enters the liquid return pipe 3 through the liquid return pipe brine inlet 7 and then flows into the freezing station; the frozen salt water in the freezing pipe exchanges heat with the surrounding soil body through the freezing pipe wall, and the surrounding soil layer is frozen.
As shown in fig. 3, when the desired freezing temperature of the formation in the middle controlled freezing section is between the upper controlled freezing section and the lower controlled freezing section: the second check valve 9, the third check valve 10 and the fourth check valve 11 are adjusted to be in an opening state, and the valve 6 is in a closing state; the low-temperature frozen brine with two temperatures respectively enters the freezing pipe 4 through the first liquid inlet pipe 1 and the second liquid inlet pipe 2 and fills the upper freezing control section and the lower freezing control section; simultaneously, the low-temperature frozen saline water with two temperatures is mixed in the middle controlled freezing section to form low-temperature frozen saline water with a third temperature; the low-temperature freezing brine in the upper freezing control section, the middle freezing control section and the lower freezing control section, which completes heat exchange, respectively enters the liquid return pipe 3 through the liquid return pipe brine inlet 7 and then flows into the freezing station; the frozen salt water in the freezing pipe exchanges heat with the surrounding soil body through the freezing pipe wall, and the surrounding soil layer is frozen.
As shown in fig. 4, when the desired freezing temperature of the formation in the upper controlled freeze zone is between the middle controlled freeze zone and the lower controlled freeze zone: the first check valve 8, the second check valve 9 and the fourth check valve 11 are adjusted to be in an opening state, and the valve 6 is in a closing state; the low-temperature frozen brine with two temperatures respectively enters the freezing pipe 4 through the first liquid inlet pipe 1 and the second liquid inlet pipe 2 and fills the middle freezing control section and the lower freezing control section; simultaneously, the low-temperature frozen brine with two temperatures is mixed in the upper freezing control section to form low-temperature frozen brine with a third temperature; the low-temperature freezing brine which finishes heat exchange in the upper control freezing section, the middle control freezing section and the lower control freezing section respectively enters the liquid return pipe 3 through the liquid return pipe brine inlet 7 and then flows into the freezing station; the frozen salt water in the freezing pipe exchanges heat with the surrounding soil body through the freezing pipe wall, and the surrounding soil layer is frozen.
In this embodiment, the working principle of the freezer capable of realizing multi-stage differential freezing is as follows: frozen saline water with different temperatures is conveyed to the bottom of a correspondingly designed freezing control section through a first liquid inlet pipe and a second liquid inlet pipe, then passes through a saline water return inlet of a liquid return pipe from bottom to top through a steel pipe of the freezing section, and low-temperature refrigerants exchange heat with surrounding soil bodies through the wall of a metal pipe to realize freezing; when the frozen brine flows to different freezing control sections, due to the blocking effect of the waterproof heat-insulating plate and the flow direction control of the one-way valve, the frozen brine with two temperatures has different circulation paths to generate different freezing effects; and the freezing saline water with two temperatures is mixed to generate a third different freezing temperature (between the temperatures of the two freezing saline waters), and the flow rates of the two freezing saline waters with different temperatures can be adjusted as required to control the volume proportion of the two freezing saline waters with different temperatures in the mixed freezing section, so that any temperature between the two freezing temperatures is obtained, and the differential freezing of the three freezing temperatures is realized.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are possible which remain within the scope of the appended claims.
Claims (10)
1. The freezer capable of realizing multi-section differential freezing is characterized by comprising a freezing pipe (4), a liquid return pipe (3), a waterproof heat-insulating plate (12) and two or more liquid inlet pipes; the waterproof heat-insulating plate (12) is arranged in the freezing pipe (4), and the freezing pipe (4) is divided into two or more freezing sections from top to bottom by the waterproof heat-insulating plate (12); one end of the liquid inlet pipe penetrates through the waterproof heat insulation plate (12) and extends into the bottom of the freezing pipe (4), a check valve is arranged on part or all of the liquid inlet pipe positioned in the freezing section above the bottommost freezing section, and a valve (6) is arranged on part or all of the liquid inlet pipe positioned in the bottommost freezing section; one end of the liquid return pipe (3) penetrates through the waterproof heat insulation plate (12) and stretches into the bottommost freezing section, and a liquid return pipe saline water inlet (7) is formed in all freezing sections above the bottommost freezing section and is formed in the liquid return pipe (3).
2. The freezer capable of realizing multistage differential freezing according to claim 1, characterized in that the freezing pipe (4) is divided into three freezing sections, namely an upper freezing control section, a middle freezing control section and a lower freezing control section from top to bottom by the waterproof and heat-insulating plate (12);
one end of the liquid inlet pipe penetrates through the waterproof heat insulation plate (12) and extends into the lower freezing control section, the one-way valve is arranged on the liquid inlet pipe which is partially or completely positioned in the upper freezing control section and the middle freezing control section, and the valve (6) is arranged on the liquid inlet pipe which is partially or completely positioned in the lower freezing control section; one end of the liquid return pipe (3) penetrates through the waterproof heat insulation plate (12) and extends into the lower freezing control section, and a saline water inlet (7) of the liquid return pipe is respectively arranged on the liquid return pipe (3) in the upper freezing control section and the middle freezing control section.
3. The freezer capable of realizing multiple-stage differential freezing according to claim 2, wherein one end of the liquid return pipe (3) extends into the top of the lower freezing-controlling section through the waterproof heat-insulating plate (12), and the liquid return pipe brine inlet (7) is respectively positioned at the top of the upper freezing-controlling section and the top of the middle freezing-controlling section.
4. A freezer capable of realizing multi-stage differential freezing according to claim 2, characterised in that the liquid inlet pipes comprise a first liquid inlet pipe (1) and a second liquid inlet pipe (2), and the check valves comprise a first check valve (8), a second check valve (9), a third check valve (10) and a fourth check valve (11);
one end of the first liquid inlet pipe (1) penetrates through the waterproof heat-insulating plate (12) and extends into the bottom of the freezing pipe (4), and one end of the second liquid inlet pipe (2) penetrates through the waterproof heat-insulating plate (12) and extends into the bottom of the freezing pipe (4); the first liquid inlet pipe (1) positioned in the upper freezing control section is provided with the first one-way valve (8), and the first liquid inlet pipe (1) positioned in the middle freezing control section is provided with the third one-way valve (10); the second liquid inlet pipe (2) positioned in the upper freezing control section is provided with the second one-way valve (9), and the second liquid inlet pipe (2) positioned in the middle freezing control section is provided with the fourth one-way valve (11); the valve (6) is arranged on the second liquid inlet pipe (2) in the lower freezing control section.
5. A freezer capable of realizing multi-stage differential freezing according to claim 4, characterised in that the first one-way valve (8) is mounted on the first liquid inlet pipe (1) at the lower part in the upper freezing control stage; the third one-way valve (10) is arranged on the first liquid inlet pipe (1) positioned at the inner lower part of the middle freezing control section; the second one-way valve (9) is arranged on the second liquid inlet pipe (2) positioned at the inner lower part of the upper freezing control section; the fourth one-way valve (11) is arranged on the second liquid inlet pipe (2) positioned at the inner lower part of the middle freezing control section; and the valve (6) is arranged on the second liquid inlet pipe (2) at the top in the lower freezing control section.
6. A freezer according to claim 5, characterised in that the liquid return pipe (3), the first liquid inlet pipe (1) and the second liquid inlet pipe (2) have an insulating material on their outer pipe wall.
7. The construction method of the multi-section difference freezing is characterized in that a freezer capable of realizing the multi-section difference freezing is used for carrying out the multi-section difference freezing construction; the freezer capable of realizing multi-section differential freezing comprises a freezing pipe (4), a liquid return pipe (3), a waterproof heat-insulating plate (12) and two or more liquid inlet pipes; the waterproof heat-insulating plate (12) is arranged in the freezing pipe (4), and the freezing pipe (4) is divided into two or more freezing sections from top to bottom by the waterproof heat-insulating plate (12); one end of the liquid inlet pipe penetrates through the waterproof heat insulation plate (12) and extends into the bottom of the freezing pipe (4), a check valve is arranged on part or all of the liquid inlet pipe positioned in the freezing section above the bottommost freezing section, and a valve (6) is arranged on part or all of the liquid inlet pipe positioned in the bottommost freezing section; one end of the liquid return pipe (3) penetrates through the waterproof heat insulation plate (12) and extends into the bottommost freezing section, and a liquid return pipe saline water inlet (7) is formed in the liquid return pipe (3) in all freezing sections above the bottommost freezing section.
8. The construction method for multi-segment differential freezing according to claim 7, comprising the steps of:
step A: determining the number of the liquid inlet pipes and the installation positions of the one-way valves and the valves (6) according to the freezing requirements of different positions of the stratum to be frozen; dividing the stratum to be frozen into two or more stratum freezing areas from top to bottom;
and B: b, adjusting the installation position of the waterproof heat insulation plate (12) in the freezing pipe (4) according to the stratum freezing area divided in the step A, and completing the assembly of the freezer capable of realizing multi-section differential freezing, so that the freezing sections formed in the freezing pipe (4) in a separated mode correspond to the stratum freezing area;
and C: low-temperature brine with different temperatures is respectively conveyed into the freezing pipes (4) through two or more than two liquid inlet pipes, and the freezing temperatures in different freezing sections are controlled by adjusting the opening and closing states of the check valves and the valves (6) in different freezing sections on the liquid inlet pipes.
9. The construction method for multi-section differential freezing according to claim 8, wherein in step A, when the number of the stratum freezing areas is 3, two waterproof heat insulation boards (12) are selected to divide the freezing pipe (4) into an upper freezing control section, a middle freezing control section and a lower freezing control section from top to bottom; the liquid inlet pipe comprises a first liquid inlet pipe (1) and a second liquid inlet pipe (2), and the one-way valve comprises a first one-way valve (8), a second one-way valve (9), a third one-way valve (10) and a fourth one-way valve (11);
in the step B, when the freezer capable of realizing multi-stage differential freezing is assembled: one end of the first liquid inlet pipe (1) penetrates through the waterproof heat-insulating plate (12) and extends into the bottom of the freezing pipe (4), and one end of the second liquid inlet pipe (2) penetrates through the waterproof heat-insulating plate (12) and extends into the bottom of the freezing pipe (4); the first one-way valve (8) is arranged on the first liquid inlet pipe (1) positioned at the inner lower part of the upper freezing control section, and the third one-way valve (10) is arranged on the first liquid inlet pipe (1) positioned at the inner lower part of the middle freezing control section; the second one-way valve (9) is arranged on the second liquid inlet pipe (2) positioned at the inner lower part of the upper freezing control section, and the fourth one-way valve (11) is arranged on the second liquid inlet pipe (2) positioned at the inner lower part of the middle freezing control section; the valve (6) is arranged on the second liquid inlet pipe (2) at the top in the lower freezing control section; one end of the liquid return pipe (3) penetrates through the waterproof heat insulation plate (12) and extends into the top of the lower freezing control section, and a salt water inlet (7) of the liquid return pipe is respectively positioned at the top in the upper freezing control section and the top in the middle freezing control section.
10. The construction method of multistage differential freezing according to claim 9, wherein in step C:
when the desired freezing temperature of the lower freeze control zone formation is between the upper freeze control zone and the middle freeze control zone: -adjusting the second one-way valve (9), the third one-way valve (10) and the valve (6) to an open state; the low-temperature frozen brine with two temperatures respectively enters the freezing pipe (4) through the first liquid inlet pipe (1) and the second liquid inlet pipe (2) and fills the upper freezing control section and the middle freezing control section; simultaneously mixing the low temperature frozen brines of the two temperatures in the lower controlled freezing section to form a low temperature frozen brine of a third temperature; the low-temperature freezing saline water which finishes heat exchange in the upper freezing control section, the middle freezing control section and the lower freezing control section respectively enters the liquid return pipe (3) through the liquid return pipe saline water inlet (7) and then flows into a freezing station;
when the desired freezing temperature of the formation of the middle controlled freezing section is between the upper controlled freezing section and the lower controlled freezing section: -adjusting the second (9), third (10) and fourth (11) one-way valves to an open state, the valve (6) being in a closed state; the low-temperature frozen brine with two temperatures respectively enters the freezing pipe (4) through the first liquid inlet pipe (1) and the second liquid inlet pipe (2) and fills the upper freezing control section and the lower freezing control section; simultaneously mixing the low-temperature frozen brines with two temperatures in the middle controlled freezing section to form a low-temperature frozen brine with a third temperature; the low-temperature frozen brine completing heat exchange in the upper freezing control section, the middle freezing control section and the lower freezing control section respectively enters the liquid return pipe (3) through the liquid return pipe brine inlet (7) and then flows into a freezing station;
when the desired freezing temperature of the upper freeze control zone formation is between the middle freeze control zone and the lower freeze control zone: -adjusting the first (8), second (9) and fourth (11) one-way valves to an open state, the valve (6) being in a closed state; the low-temperature frozen brine with two temperatures respectively enters the freezing pipe (4) through the first liquid inlet pipe (1) and the second liquid inlet pipe (2) and fills the middle freezing control section and the lower freezing control section; simultaneously mixing the cryogenic frozen brines of the two temperatures in the upper controlled freezing section to form a cryogenic frozen brine of a third temperature; the low-temperature freezing saline water which finishes heat exchange in the upper freezing control section, the middle freezing control section and the lower freezing control section respectively enters the liquid return pipe (3) through the liquid return pipe saline water inlet (7) and then flows into the freezing station.
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| CN202211175485.9A CN115492587B (en) | 2022-09-26 | 2022-09-26 | Freezer capable of realizing multi-section difference freezing and multi-section difference freezing construction method |
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| CN115492587B CN115492587B (en) | 2024-11-08 |
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| CN213204078U (en) * | 2020-09-18 | 2021-05-14 | 刘明根 | Liquid nitrogen freezing equipment for segmented freezing |
| CN112922002A (en) * | 2021-04-14 | 2021-06-08 | 安徽理工大学 | Local difference freezing pipe capable of controlling freezing section applied to freezing construction |
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2022
- 2022-09-26 CN CN202211175485.9A patent/CN115492587B/en active Active
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| JP2005023614A (en) * | 2003-06-30 | 2005-01-27 | Fukuda Corp | Freezing pipe used for freezing treatment and freezing method using freezing pipe |
| CN102619213A (en) * | 2012-02-16 | 2012-08-01 | 中国矿业大学(北京) | Freezing apparatus with double circulating systems |
| US20200063391A1 (en) * | 2017-05-11 | 2020-02-27 | Vinci Construction | Method and device for freezing a mass of soil |
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|---|---|
| CN115492587B (en) | 2024-11-08 |
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