CN113107495B - Inclined shaft freezing and cold energy recovery device capable of improving safe operation of ammonia system without stopping - Google Patents
Inclined shaft freezing and cold energy recovery device capable of improving safe operation of ammonia system without stopping Download PDFInfo
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- CN113107495B CN113107495B CN202110338617.4A CN202110338617A CN113107495B CN 113107495 B CN113107495 B CN 113107495B CN 202110338617 A CN202110338617 A CN 202110338617A CN 113107495 B CN113107495 B CN 113107495B
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 285
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 132
- 238000007710 freezing Methods 0.000 title claims abstract description 119
- 230000008014 freezing Effects 0.000 title claims abstract description 118
- 238000011084 recovery Methods 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 296
- 239000012267 brine Substances 0.000 claims abstract description 132
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 131
- 238000000605 extraction Methods 0.000 claims abstract description 23
- 239000012530 fluid Substances 0.000 claims description 193
- 238000004891 communication Methods 0.000 claims description 93
- 230000007246 mechanism Effects 0.000 claims description 37
- 239000007921 spray Substances 0.000 claims description 36
- 238000005507 spraying Methods 0.000 claims description 28
- 239000007788 liquid Substances 0.000 claims description 16
- 238000007599 discharging Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 6
- 239000000498 cooling water Substances 0.000 description 64
- 238000001816 cooling Methods 0.000 description 23
- 239000013505 freshwater Substances 0.000 description 18
- 238000000034 method Methods 0.000 description 14
- 238000010276 construction Methods 0.000 description 12
- 239000003507 refrigerant Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 4
- 230000005641 tunneling Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- XZPVPNZTYPUODG-UHFFFAOYSA-M sodium;chloride;dihydrate Chemical compound O.O.[Na+].[Cl-] XZPVPNZTYPUODG-UHFFFAOYSA-M 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D1/00—Sinking shafts
- E21D1/10—Preparation of the ground
- E21D1/12—Preparation of the ground by freezing
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D1/00—Sinking shafts
- E21D1/10—Preparation of the ground
- E21D1/12—Preparation of the ground by freezing
- E21D1/14—Freezing apparatus
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
Abstract
The invention discloses a freeze and cold recovery device for an inclined shaft, which is capable of improving safe operation of an ammonia system without stopping, and comprises a brine system, an ammonia system, a clean water system and a frozen wall cold extraction system in a finished stage, wherein the brine system provides cold for frozen walls in an unfinished stage, the ammonia system provides cold for low-temperature brine of the brine system, the clean water system provides cold for high-temperature and high-pressure ammonia of the ammonia system, and the frozen wall cold extraction system provides cold for the clean water system. The invention adopts the additionally arranged frozen wall cold energy extraction system at the finished stage to extract the cold energy accumulated in the frozen wall at the finished stage, can ensure that the inclined shaft freezing system can realize continuous operation without stopping the machine, reduces the operation cost, effectively avoids the waste of water resources and energy, and greatly improves the safety of the pit shaft freezing system.
Description
Technical Field
The invention relates to the technical field of cold energy recovery, in particular to a inclined shaft freezing and cold energy recovery device capable of improving the safe operation of an ammonia system without stopping.
Background
The freezing method well sinking is a construction method for temporarily reinforcing an unstable stratum and isolating underground water by adopting an artificial refrigeration technology. The freezing method is suitable for loose and unstable bedding layers, fractured water bearing rock layers, soft mudstones and rock layers with particularly high water content and water pressure. The freezing method well sinking can be used as a conventional construction method of mine engineering with complex geological conditions, can also be used as engineering rescue and accident handling means, is widely applied to the construction of a vertical well, an inclined well, a horsehead door and the like in coal mine roadway engineering, and also has application in the construction of subways, bridges and culverts, large-volume underground chambers and deep foundation pit engineering. In addition, many large-scale refrigerators are designed by adopting an artificial refrigeration technology, and besides fluoride, ammonia media are widely applied due to good physical and chemical properties of the refrigerants.
Currently, according to the technical route of conventional construction of wellbore freezing, the artificial refrigeration freezing technology is generally divided into three systems, namely a brine system (or chilled water system), an ammonia system and a clean water system (or cooling water system). The working principle is that the brine system circulates cold energy to the underground to exchange heat with the stratum, and the brought stratum heat achieves the purpose of cooling through the phase change diffusion of ammonia in the ammonia system, and the way of the phase change diffusion is mainly represented by the temperature difference of water entering and returning of the clean water system.
Due to the influence of a construction plan and a construction process, a plurality of freezing shafts are in a positive shaft freezing period in wet and hot weather, all units need to be operated under full load according to the formation cooling capacity requirement, and even standby units need to be started. However, the clean water system has high water inlet temperature, high air wet bulb temperature and insufficient evaporation capacity in the environment, so that the cooling water system has less heat taken away, the latent heat of the phase change of the refrigerant cannot be dissipated, the operation efficiency of the refrigerant is greatly influenced, and the refrigerating capacity of the system is reduced. Meanwhile, the refrigerant always keeps high-temperature and high-pressure operation, the exhaust pressure of the system is high, and great potential safety hazards are generated to equipment, pipelines, safety valves and the like in the refrigerant system, and especially when the refrigerant is a toxic, harmful, inflammable and explosive medium such as ammonia, the safety performance is extremely poor.
To ensure the safety of the system, the following measures are generally taken:
1) The device is off-load. The method is the most common and direct means, and reduces the temperature difference between the water inlet and the water return of a brine system by reducing the load of part of equipment or stopping the equipment so as to reduce the heat absorption quantity of the system from the stratum (namely, reduce the heat required to be dissipated by a cooling system), and the equipment is generally modified and reduced by taking the 'no temperature rise in daytime and no temperature drop at night' as targets in a freezing construction site. Although the method effectively ensures the safety of the system, the stratum has poor heat exchange efficiency, thus being easy to cause construction period delay and electric power loss. In addition, if partial load shedding cannot achieve the depressurization effect, a means of stopping a part of the unit is often adopted, and when the unit is restarted in high humidity weather or in continuous overcast and rainy days, three-phase resistance values of a motor of the refrigerator need to be measured in advance, if the starting requirement cannot be met, the unit needs to be heated and baked, otherwise forced starting is extremely easy to cause motor burning accidents.
2) The equipment is added. In the freezing design, the condenser is installed with a ratio of 1:1.2 or even 1:1.5 beyond the current installation ratio of the freezer to the evaporative condenser of 1:1. The refrigerant is cooled in a mode of increasing the evaporation area, so that the heat exchange efficiency is ensured. The method not only increases the investment, installation and maintenance workload of equipment, but also increases the transportation cost.
3) And reducing the water inlet temperature of the cooling water. Firstly, adding a spraying device in a clear water backwater system, cooling by air, and then mixing with water supply to enter the system for circulation; secondly, the fresh water supply is completely adopted for circulation, a certain effect can be generated by arranging the spraying device, but the fresh water supply can cause great water resource waste.
In addition, if a multi-circle hole freezing design is adopted in the vertical shaft construction, the fact that the freezing wall is not intersected with circles indicates that the cooling capacity in the stratum is insufficient, and the cooling capacity supply needs to be further enhanced; if the freezing wall has crossed circles, the shaft is basically provided with trial digging conditions, the inner ring hole can be selected to be shut down or reduced in flow after formal digging according to actual conditions, the maintenance freezing period is carried out, the temperature of brine can be generally adjusted to be more than minus 25 ℃ from minus 28 ℃, and at the moment, the refrigerating units can meet the formation cooling requirement without extracting cooling again. If the construction engineering adopts the inclined shaft freezing mode, the inclined shaft freezing mode is adopted at present, the inclined shaft freezing mode is adopted in a staged and segmented local freezing mode, the inclined shaft freezing mode is stepwise and segmented freezing [ can refer to ZL201310692506.9 ], after the frozen wall meets the design requirement, tunneling is started, freezing passing through the excavation face is required to be cut off during tunneling, tunneling is performed under the guarantee of the frozen wall, permanent support is performed after the tunneling is completed, after the support is completed, the frozen wall completes the life under the condition that the construction of the initial section is completed, a large amount of cold energy still exists in the frozen wall at the moment, energy is wasted if the cold energy cannot be effectively utilized, and the residual heat of the inner frozen wall has timeliness and the safety of the well wall is required to be further evaluated.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide the inclined shaft freezing and cold energy recovery device for improving the safe operation of the ammonia system without stopping, so as to solve the problems of cost increase, water resource waste, safety and the like caused by taking measures of equipment load reduction, equipment increase or cooling water inlet temperature reduction and the like in the prior art.
In order to solve the technical problems, the invention provides the following technical scheme:
the inclined shaft freezing and cold recovery device is characterized by comprising a brine system, an ammonia system, a clean water system and a frozen wall cold extraction system in a finished stage, wherein the brine system provides cold for frozen walls in an unfinished stage, the ammonia system provides cold for low-temperature brine in the brine system, the clean water system provides cold for high-temperature and high-pressure ammonia in the ammonia system, and the frozen wall cold extraction system provides cold for the clean water system. The device reduces the temperature of the clean water cooling water of the clean water system by extracting the cold energy of the frozen wall in the finished stage, and can effectively improve the utilization efficiency of the cold energy stored in the frozen wall in the finished stage, thereby improving the circulation efficiency of freezing the whole cold energy of the inclined shaft, not only ensuring that the inclined shaft freezing system can continuously operate without stopping, reducing the operation cost, but also effectively avoiding the waste of resources such as water and the like, and greatly improving the safety of the pit shaft freezing system.
The inclined shaft freezing and cold energy recovery device for improving the safe operation of the ammonia system without stopping the machine comprises a finished stage freezing wall, a finished stage freezing pipe, a finished stage brine pump and a heat exchanger for exchanging heat between the finished stage brine and clear water of a clear water system; the brine outlet of the brine pump at the finished stage is in fluid communication with the brine inlet of the brine pump at the finished stage, the freezing pipe at the finished stage is positioned in the freezing wall at the finished stage, a thermometer is arranged on a pipeline communicated between the heat exchanger and the brine pump at the finished stage, and a gate valve and a thermometer are sequentially arranged on the pipeline between the brine pump at the finished stage and the freezing pipe at the finished stage along the flow direction of fluid in the pipeline; the brine pump in the finished stage can extract and transfer a large amount of cold energy stored in the freezing wall in the finished stage to the section to be frozen through the heat exchanger for cooling the cooling water of the clean water system.
The clear water system comprises a first clear water pump, a first clear water tank, a spraying mechanism, an evaporative condenser and a condenser bracket, wherein the evaporative condenser is fixedly arranged on the condenser bracket; the clear water outlet of the first clear water pump is in fluid conduction with the clear water inlet of the heat exchanger, the clear water cooling water flowing out of the clear water outlet of the first clear water pump is higher in temperature, and after entering the heat exchanger, the clear water cooling water exchanges heat with cold energy carried by brine flowing out of a freezing pipe in a finished stage in the heat exchanger, so that the temperature of the clear water cooling water is reduced, and cooled clear water flows out of the clear water outlet of the heat exchanger and is used for cooling an ammonia system. The clean water outlet of the heat exchanger is in fluid connection with the spray water inlet of the spray mechanism, the spray mechanism is positioned in the evaporative condenser, the spray water outlet of the spray mechanism is opposite to an ammonia coil pipe positioned in the evaporative condenser, high-temperature and high-pressure ammonia gas of the ammonia system is arranged in the ammonia coil pipe, and the spray water outlet of the evaporative condenser is in fluid connection with the spray water inlet of the first clean water tank; and a communicating pipeline between the heat exchanger and the spraying mechanism is provided with a thermometer.
The inclined shaft freezing and cold energy recovery device for improving the safe operation of the ammonia system without stopping the machine, wherein the cold energy extraction system of the frozen wall in the finished stage comprises the frozen wall in the finished stage and a frozen pipe in the finished stage; the clear water system comprises a first clear water pump, a first clear water tank, a spraying mechanism, an evaporative condenser and a condenser bracket, wherein the evaporative condenser is fixedly arranged on the condenser bracket;
the fresh water outlet of the first fresh water pump is in fluid communication with the fluid inlet of the freezing pipe at the finished stage, the fluid outlet of the freezing pipe at the finished stage is in fluid communication with the fluid inlet of the spraying mechanism through a first pipeline, the spraying mechanism is positioned in the evaporative condenser, the spray water outlet of the spraying mechanism is opposite to an ammonia coil pipe positioned in the evaporative condenser, high-temperature and high-pressure ammonia gas of the ammonia system is arranged in the ammonia coil pipe, the spray water outlet of the evaporative condenser is in fluid communication with the spray water inlet of the first fresh water tank, and the fluid outlet of the first fresh water tank is in fluid communication with the fluid inlet of the first fresh water pump. At this time, the clear water cooling water with higher temperature flowing out from the clear water outlet of the first clear water pump directly enters the freezing pipe at the finished stage to extract the cold energy accumulated in the freezing wall at the finished stage, and is used for heat dissipation of the ammonia system through the spraying mechanism.
The inclined shaft freezing and cold energy recovery device for improving the safe operation of the ammonia system without stopping is characterized in that a fluid outlet of a second clean water tank of the clean water system is in fluid communication with a clean water inlet of a second clean water pump, and the clean water outlet of the second clean water pump is in fluid communication with a first pipeline through a second pipeline; the temperature measuring device is characterized in that a temperature measuring meter and a gate valve are sequentially arranged on the second pipeline along the fluid flow direction, the temperature measuring meter, the gate valve and the temperature measuring meter are sequentially arranged on the first pipeline along the fluid flow direction, and the communication position of the second pipeline and the first pipeline is located between the gate valve on the first pipeline and the downstream of the first pipeline. When the cooling water quantity for circulation in the first clean water tank is insufficient or the temperature is higher in the circulation process, the gate valve is opened, so that the cooling water in the second clean water tank is supplemented into the clean water system through the second clean water pump to adjust the quantity and the temperature of the cooling water, and the cooling water enters the evaporative condenser along with the clean water cooling water to cool the ammonia system.
The inclined shaft freezing and cold energy recovery device for improving the safe operation of the ammonia system without stopping the machine, wherein the cold energy extraction system of the frozen wall in the finished stage comprises the frozen wall in the finished stage and a frozen pipe in the finished stage; the clear water system comprises a first clear water pump, a first clear water tank, a heat exchange coil, an evaporative condenser and a condenser bracket, wherein the evaporative condenser is fixedly arranged on the condenser bracket; the cold quantity extracted from the freezing wall in the finished stage is cooled by heat radiation of the ammonia system in the evaporative condenser through the heat exchange coil.
The fresh water outlet of the first fresh water pump is in fluid communication with the fluid inlet of the freezing pipe at the finished stage, the fluid outlet of the freezing pipe at the finished stage is in fluid communication with the fluid inlet of the heat exchange coil pipe through a first pipeline, the heat exchange coil pipe is positioned in the evaporative condenser, the heat exchange coil pipe is adjacent to the ammonia coil pipe positioned in the evaporative condenser, high-temperature and high-pressure ammonia gas of the ammonia system is arranged in the ammonia coil pipe, the fluid outlet of the heat exchange coil pipe is in fluid communication with the fluid inlet of the first fresh water tank, and the fluid outlet of the first fresh water tank is in fluid communication with the fluid inlet of the first fresh water pump.
The inclined shaft freezing and cold energy recovery device for improving the safe operation of the ammonia system without stopping is characterized in that a fluid outlet of a second clean water tank of the clean water system is in fluid communication with a clean water inlet of a second clean water pump, and the clean water outlet of the second clean water pump is in fluid communication with a first pipeline through a second pipeline; the temperature measuring device is characterized in that a temperature measuring meter and a gate valve are sequentially arranged on the second pipeline along the fluid flow direction, the temperature measuring meter, the gate valve and the temperature measuring meter are sequentially arranged on the first pipeline along the fluid flow direction, and the communication position of the second pipeline and the first pipeline is located between the gate valve on the first pipeline and the downstream of the first pipeline. When the cooling water quantity for circulation in the first clean water tank is insufficient or the temperature of the cooling water is higher in the circulation process, the gate valve is opened, so that clean water in the second clean water tank is supplemented into the clean water system through the second clean water pump to adjust the quantity and the temperature of the cooling water, and the cooling water enters the evaporative condenser along with the clean water cooling water to cool the ammonia system.
The inclined shaft freezing and cold recovery device capable of improving the safe operation of the ammonia system without stopping the machine comprises an unfinished stage brine pump, an unfinished stage brine tank, a liquid collecting and distributing ring, an unfinished stage freezing pipe and a stratum to be frozen, wherein the low-temperature brine outlet of the unfinished stage brine tank is in fluid communication with the low-temperature brine inlet of the unfinished stage brine pump, the low-temperature brine outlet of the unfinished stage brine pump is in fluid communication with the low-temperature brine inlet of the liquid collecting and distributing ring, the low-temperature brine outlet of the liquid collecting and distributing ring is in fluid communication with the low-temperature brine inlet of the unfinished stage freezing pipe, the high-temperature brine outlet of the liquid collecting and distributing ring is in fluid communication with the high-temperature brine inlet of an evaporator of the ammonia system, the low-temperature brine outlet of the evaporator of the ammonia system is in fluid communication with the low-temperature brine inlet of the liquid collecting and distributing ring, and the high-temperature brine outlet of the unfinished stage freezing pipe is in fluid communication with the stratum to be frozen.
The inclined shaft freezing and cold recovery device capable of improving safe operation of the ammonia system without stopping the machine comprises a compressor, an oil collector, a siphon tank and an ammonia storage tank, wherein a first fluid outlet of an evaporator for discharging low-temperature low-pressure ammonia gas is in fluid communication with a low-temperature low-pressure ammonia gas inlet of the compressor, a high-temperature high-pressure ammonia gas outlet of the compressor is in fluid communication with a high-temperature high-pressure ammonia gas inlet of an ammonia coil, a fluid outlet of the ammonia coil is in fluid communication with a fluid inlet of the siphon tank, a fluid outlet of the siphon tank is in fluid communication with a fluid inlet of the ammonia storage tank, a first fluid outlet of the ammonia storage tank is in fluid communication with a fluid inlet of the oil collector, a second fluid outlet of the ammonia storage tank is in fluid communication with a liquid ammonia inlet of the evaporator, a fluid outlet of the oil collector is in fluid communication with a low-temperature low-pressure ammonia gas inlet of the compressor, and a second fluid outlet of the evaporator is in fluid communication with a fluid inlet of the oil collector.
The technical scheme of the invention has the following beneficial technical effects:
(1) According to the invention, the cold quantity accumulated in the frozen wall in the finished stage is extracted by additionally arranging the frozen wall cold quantity extraction system in the finished stage on the basis of the traditional shaft freezing three-system, so that the water inlet temperature of clean water cooling water of the clean water system is reduced, and the utilization efficiency of the cold quantity accumulated in the frozen wall in the finished stage is improved, thereby effectively improving the circulation efficiency of the whole cold quantity frozen by the inclined shaft. The essence of the frozen wall cold extraction system in the finished stage is heat exchange, an original freezing pipe is used as a heat exchanger, after fluid with higher circulating temperature enters the freezing pipe, the cold in the frozen wall is absorbed, the temperature of the fluid is reduced, and the medium to be cooled is cooled by using low-temperature fluid, so that the extraction of the cold in the frozen wall is realized. The system is additionally arranged, so that the inclined shaft freezing system can realize continuous operation without stopping, the operation cost is reduced, the waste of water resources and energy is effectively avoided, and the safety of the shaft freezing system is greatly improved.
(2) In the system for extracting cold of the frozen wall in the finished stage, the brine pump in the finished stage pumps brine water into the freezing pipe in the finished stage to extract the cold stored in the frozen wall in the finished stage, and the heat exchanger is used for extracting and transferring a large amount of cold stored in the frozen wall in the finished stage to the section to be frozen for cooling the cooling water of the clean water system. The cooling water cooling and heat exchanging mode is as follows: the clear water cooling water flowing out from the clear water outlet of the first clear water pump has higher temperature, and exchanges heat with the cold energy carried by the brine flowing out from the freezing pipe at the finishing stage in the heat exchanger after entering the heat exchanger, so that the temperature of the clear water cooling water is reduced, and cooled clear water flows out from the clear water outlet of the heat exchanger for cooling of the ammonia system.
(3) The invention can also directly convey clear water cooling water with higher temperature flowing out from the clear water outlet of the first clear water pump into the freezing pipe at the finished stage to extract the cold energy accumulated in the freezing wall at the finished stage, and then the cold energy is used for heat dissipation of the ammonia system through the spraying mechanism. Meanwhile, when the quantity of the clean water used for circulation in the first clean water tank is insufficient or the temperature is higher in the circulation process, the gate valve is opened, so that the clean water in the second clean water tank is supplemented into the clean water system through the second clean water pump to adjust the quantity and the temperature of the cooling water. When the ammonia system is subjected to heat dissipation and temperature reduction, the clean water system end can adopt an opening mode and a closing mode, for example, the heat exchange system can be realized by arranging a spraying mechanism or a heat exchange coil pipe respectively.
(4) According to the invention, the cooling water cooling heat exchange system is arranged, so that the cold quantity of the original saline water system for cooling the stratum is circularly fed into the clean water system. From an energy conservation perspective, the total energy input for wellbore freezing is not increased; but from a security point of view, and field applications, it has shown: the water inlet temperature of the clean water system can be reduced by 2-4 ℃, the evaporation efficiency is effectively increased, the exhaust pressure of a compressor (a refrigerator) is reduced (about 0.1MPa can be generally reduced), the safety of equipment, pipelines and safety valves is greatly improved, and the safe and stable operation of the ammonia system in a high-temperature and high-humidity environment is realized.
Drawings
FIG. 1 is a schematic diagram of a wellbore freeze technique;
FIG. 2 is an enlarged view of a schematic of a wellbore freeze technique;
FIG. 3 is a schematic diagram of the operation of the cold recovery device according to embodiment 1 of the present invention;
FIG. 4 is a schematic diagram of the operation of the cold recovery device according to embodiment 2 of the present invention;
FIG. 5 is a schematic diagram of the operation of the cold recovery device according to embodiment 3 of the present invention;
FIG. 6 is a schematic diagram of the operation of the open-ended clear water system of the present invention;
FIG. 7 is a schematic diagram of the operation of the closed-type clean water system of the present invention.
The reference numerals in the drawings are as follows: 1-a brine pump in an unfinished stage; 2-a brine tank in an unfinished stage; an evaporator of a 3-ammonia system; 4-compressors; 5-an oil collector; 6-an ammonia storage tank; 7-a siphon tank; 8-an evaporative condenser; 9-a first clean water pump; 10-a first clear water tank; 11-collecting and preparing liquid ring; 12-freezing the tube in an unfinished stage; 13-formation to be frozen; 14-gate valve; 15-brine tank; 16-coil pipe; 1-1 a brine pump at the finishing stage; 1-2 second pipelines; 1-3 thermometers; 1-4 spraying mechanisms; 1-5 ammonia coils; 1-6 first pipelines; 1-7 condenser brackets; 1-8 heat exchange coils; 1-9 heat exchangers; 1-10 freezing the tube at the finished stage; 1-11 freezing the wall at the finished stage; 1-12 second clean water pumps; 1-13 second clear water tank.
Detailed Description
Example 1
The utility model provides a freeze and cold volume recovery unit of inclined shaft that ammonia system safety was operated is improved to non-stop, includes brine system, ammonia system, clear water system and the stage that has finished freezes wall cold volume extraction system, and brine system provides cold volume to the stage that does not finish freezes wall, and ammonia system provides cold volume to brine system's low temperature salt water, and clear water system provides cold volume to ammonia system's high temperature high pressure ammonia, and stage that has finished freezes wall cold volume extraction system provides cold volume to clear water system. The device reduces the temperature of the clean water cooling water of the clean water system by extracting the cold energy of the frozen wall in the finished stage, and can effectively improve the utilization efficiency of the cold energy stored in the frozen wall in the finished stage, thereby improving the circulation efficiency of freezing the whole cold energy of the inclined shaft, not only ensuring that the inclined shaft freezing system can continuously operate without stopping, reducing the operation cost, but also effectively avoiding the waste of resources such as water and the like, and greatly improving the safety of the pit shaft freezing system.
As shown in fig. 1 and 2, the brine system includes an unfinished stage brine pump 1, an unfinished stage brine tank 2, a liquid collecting ring 11, an unfinished stage freezing pipe 12 and a formation 13 to be frozen, wherein a low-temperature brine outlet of the unfinished stage brine tank 2 is in fluid communication with a low-temperature brine inlet of the unfinished stage brine pump 1, a low-temperature brine outlet of the unfinished stage brine pump 1 is in fluid communication with a low-temperature brine inlet of the liquid collecting ring 11, a low-temperature brine outlet of the liquid collecting ring 11 is in fluid communication with a low-temperature brine inlet of the unfinished stage freezing pipe 12, a high-temperature brine outlet of the liquid collecting ring 12 is in fluid communication with a high-temperature brine inlet of the liquid collecting ring 11, a high-temperature brine outlet of the evaporator 3 of the ammonia system is in fluid communication with a low-temperature brine inlet of the unfinished stage brine tank 2, and the unfinished stage freezing pipe 12 is located in the formation 13 to be frozen.
As shown in fig. 2, the ammonia system comprises a compressor 4, an oil collector 5, an ammonia storage tank 6 and a siphon tank 7, wherein a first fluid outlet of the evaporator 3 for discharging low-temperature low-pressure ammonia gas is in fluid communication with a low-temperature low-pressure ammonia gas inlet of the compressor 4, a high-temperature high-pressure ammonia gas outlet of the compressor 4 is in fluid communication with a high-temperature high-pressure ammonia gas inlet of the ammonia coil 1-5, a fluid outlet of the ammonia coil 1-5 is in fluid communication with a fluid inlet of the siphon tank 7, a fluid outlet of the siphon tank 7 is in fluid communication with a fluid inlet of the ammonia storage tank 6, a first fluid outlet of the ammonia storage tank 6 is in fluid communication with a fluid inlet of the oil collector 5, a second fluid outlet of the ammonia storage tank 6 is in fluid communication with a liquid ammonia gas inlet of the evaporator 3, a fluid outlet of the oil collector 5 is in fluid communication with a low-temperature low-pressure ammonia gas inlet of the compressor 4, and a second fluid outlet of the evaporator 3 is in fluid communication with a fluid inlet of the oil collector 5.
As shown in fig. 3, the clean water system comprises a first clean water pump 9, a first clean water tank 10, a spraying mechanism 1-4, an evaporative condenser 8 and a condenser bracket 1-7, wherein the evaporative condenser 8 is fixedly arranged on the condenser bracket 1-7; the clear water outlet of the first clear water pump 9 is in fluid conduction with the clear water inlet of the heat exchangers 1-9, the clear water cooling water flowing out of the clear water outlet of the first clear water pump has higher temperature, and after entering the heat exchanger, the clear water cooling water exchanges heat with the cold energy carried by the brine flowing out of the freezing pipe in the finished stage in the heat exchanger, so that the temperature of the clear water cooling water is reduced, and cooled clear water flows out of the clear water outlet of the heat exchanger for cooling of the ammonia system. The clear water outlet of the heat exchanger 1-9 is in fluid connection with the spray water inlet of the spray mechanism 1-4, the spray mechanism 1-4 is positioned in the evaporative condenser 8, the spray water outlet of the spray mechanism 1-4 is opposite to the ammonia coil 1-5 positioned in the evaporative condenser 8, high-temperature and high-pressure ammonia gas of an ammonia system is arranged in the ammonia coil 1-5, and the spray water outlet of the evaporative condenser 8 is in fluid connection with the spray water inlet of the first clear water tank 10; a communicating pipe between the heat exchanger 1-9 and the spraying mechanism 1-4 is provided with a thermometer 1-3.
As shown in fig. 3, the frozen wall cold energy extraction system in the finished stage comprises a frozen wall 1-11 in the finished stage, a frozen pipe 1-10 in the finished stage, a brine pump 1-1 in the finished stage and a heat exchanger 1-9 for exchanging heat between brine in the finished stage and clear water in a clear water system; the brine fluid outlet of the finished stage freezing pipe 1-10 is in fluid communication with the brine inlet of the heat exchanger 1-9, the brine outlet of the heat exchanger 1-9 is in fluid communication with the brine inlet of the finished stage brine pump 1-1, the brine outlet of the finished stage brine pump 1-1 is in fluid communication with the brine inlet of the finished stage freezing pipe 1-10, the finished stage freezing pipe 1-10 is positioned in the finished stage freezing wall 1-11, a temperature measuring meter 1-3 is arranged on a pipeline communicated between the heat exchanger 1-9 and the finished stage brine pump 1-1, and a gate valve 14 and the temperature measuring meter 1-3 are sequentially arranged on the pipeline between the finished stage brine pump 1-1 and the finished stage freezing pipe 1-10 along the fluid flow direction in the pipeline; the brine pump in the finished stage can extract and transfer a large amount of cold energy stored in the freezing wall in the finished stage to the section to be frozen through the heat exchanger for cooling the cooling water of the clean water system.
The working flow is as follows: when the shaft is frozen, the cooling water in the clean water system flows out of the ammonia system after providing cold energy, the temperature of the clean water cooling water is higher, and the clean water cooling water with higher temperature is pumped into the clean water inlet of the heat exchanger 1-9 through the first clean water pump 9 and enters the heat exchanger 1-9; whereas the brine pump 1-1 in the finishing stage pumps brine with higher temperature into the freezing pipe 1-10 in the finishing stage to extract the cold energy accumulated in the freezing wall 1-11 in the finishing stage, the temperature of the brine coming out of the brine fluid outlet of the freezing pipe 1-10 in the finishing stage is reduced, and the brine enters the heat exchanger 1-9 from the brine inlet of the heat exchanger 1-9; in the heat exchanger 1-9, the clear water cooling water with higher temperature exchanges heat with the brine with lower temperature, after the heat exchange, the temperature of the clear water cooling water flowing out of the clear water outlet of the heat exchanger 1-9 is reduced, and the clear water cooling water enters the spraying mechanism 1-4 through a pipeline, the clear water cooling water with reduced temperature exchanges heat with the ammonia coil 1-5 in the evaporative condenser 8, after the heat exchange is carried out in the evaporative condenser 8, the temperature of the clear water cooling water rises, and the clear water cooling water flows out of the spraying water outlet of the evaporative condenser 8 and enters the first clear water tank 10, and the clear water cooling water with higher temperature in the first clear water tank is pumped into the clear water inlet of the heat exchanger 1-9 through the first clear water pump 9 and enters the heat exchanger for heat exchange again; at the same time, after heat exchange, the temperature of the brine flowing out of the brine fluid outlet of the heat exchanger 1-9 becomes high, and the brine is re-conveyed to the brine pump 1-1 at the finished stage through the pipeline, and pumped into the freezing pipe at the finished stage through the brine pump 1-1 at the finished stage to enter the heat exchange cycle of the next round.
Through practical tests, the well bore freezing is carried out in high-temperature and high-humidity weather, and the cold energy recovery device can reduce the water inlet temperature of the clean water system by 2 ℃ and the exhaust pressure of the compressor by 0.1MPa, so that the safe and stable operation of the ammonia system in a high-temperature and high-humidity environment is realized.
In the embodiment, the clear water outlet of the heat exchanger 1-9 is in fluid communication with the spray water inlet of the spray mechanism 1-4, and the spray water outlet of the spray mechanism 1-4 is opposite to the ammonia coil 1-5 positioned in the evaporative condenser 8; as shown in fig. 6, the fresh water cooling and heat exchanging unit in this embodiment essentially circulates part of the cold energy of the low-temperature brine in the brine tank 15 into the fresh water system through the coil pipe, and the end of the fresh water system can adopt two modes, namely an opening mode and a closing mode, in this embodiment, the opening mode is shown in fig. 6. In addition, in other embodiments, the clean water system end may also adopt a closed-end mode as shown in fig. 7, and heat transfer between the clean water in the first clean water tank and the brine in the brine system is realized by using the clean water circularly flowing in the coil pipe, so that the closed-end clean water system can achieve the technical effect equivalent to the embodiment.
Example 2
The utility model provides a freeze and cold volume recovery unit of inclined shaft that ammonia system safety was operated is improved to non-stop, includes brine system, ammonia system, clear water system and the stage that has finished freezes wall cold volume extraction system, and brine system provides cold volume to the stage that does not finish freezes wall, and ammonia system provides cold volume to brine system's low temperature salt water, and clear water system provides cold volume to ammonia system's high temperature high pressure ammonia, and stage that has finished freezes wall cold volume extraction system provides cold volume to clear water system.
The brine system and ammonia system of this embodiment are the same in structure as in embodiment 1, see in particular fig. 1 and 2. As shown in fig. 4, the finished stage frozen wall cold extraction system includes a finished stage frozen wall 1-11 and a finished stage frozen pipe 1-10; the clear water system comprises a first clear water pump 9, a first clear water tank 10, a spraying mechanism 1-4, an evaporative condenser 8 and a condenser bracket 1-7, wherein the evaporative condenser 8 is fixedly arranged on the condenser bracket 1-7; the clear water outlet of the first clear water pump 9 is in fluid communication with the fluid inlet of the finished stage freezing pipe 1-10, the fluid outlet of the finished stage freezing pipe 1-10 is in fluid communication with the fluid inlet of the spraying mechanism 1-4 through the first pipeline 1-6, the spraying mechanism 1-4 is positioned in the evaporative condenser 8, the spray water outlet of the spraying mechanism 1-4 is opposite to the ammonia coil 1-5 positioned in the evaporative condenser 8, high-temperature and high-pressure ammonia gas of an ammonia system is arranged in the ammonia coil 1-5, the spray water outlet of the evaporative condenser 8 is in fluid communication with the spray water inlet of the first clear water tank 10, and the fluid outlet of the first clear water tank 10 is in fluid communication with the fluid inlet of the first clear water pump 9. In this embodiment, the higher temperature fresh water cooling water flowing out of the fresh water outlet of the first fresh water pump is not cooled by the heat exchangers 1-9 as described in embodiment 1, but directly enters the finished stage freezing pipe to extract the cold energy accumulated in the finished stage freezing wall, and is then used for heat dissipation of the ammonia system by the spray mechanism.
In fig. 4, the fluid outlet of the second clean water tank 1-13 of the clean water system is in fluid communication with the clean water inlet of the second clean water pump 1-12, the clean water outlet of the second clean water pump 1-12 being in fluid communication with the first pipeline 1-6 via the second pipeline 1-2; a temperature detector 1-3 and a gate valve 14 are sequentially arranged on the second pipeline 1-2 along the fluid flow direction, a temperature detector 1-3, a gate valve 14 and a temperature detector 1-3 are sequentially arranged on the first pipeline 1-6 along the fluid flow direction, and the communication position of the second pipeline 1-2 and the first pipeline 1-6 is positioned between the gate valve 14 on the first pipeline 1-6 and the downstream temperature detector 1-3 on the first pipeline 1-6; when the quantity of the clean water used for circulation in the first clean water tank is insufficient or the temperature is higher in the circulation process, the gate valve is opened, so that the clean water in the second clean water tank is supplemented into the clean water system through the second clean water pump to adjust the quantity and the temperature of the cooling water, and the cooling water enters the evaporative condenser along with the clean water cooling water to cool the ammonia system.
The working flow is as follows: when the shaft is frozen, the cooling water in the clear water system is higher in temperature of the clear water cooling water flowing out of the evaporative condenser 8 after the cooling capacity is provided for the ammonia system, the clear water cooling water with higher temperature enters the first clear water tank 10 and is directly pumped into the finished stage freezing pipes 1-10 through the first clear water pump 9 to extract the cooling capacity stored in the finished stage freezing walls 1-11, and the temperature of the clear water cooling water flowing out of the fluid outlets of the finished stage freezing pipes 1-10 is reduced and enters the first pipelines 1-6; at the same time, the gate valve 14 is opened, a part of clear water cooling water in the second clear water tank 1-13 is converged with the clear water cooling water flowing out of the fluid outlet of the finished stage freezing pipe 1-10 in the first pipeline 1-6 through the second clear water pump 1-12 so as to be used for adjusting the quantity of circulating cooling water or the temperature of the clear water cooling water, the converged clear water cooling water is conveyed to the spraying mechanism 1-4 to exchange heat with the ammonia coil 1-5 in the evaporative condenser 8, after the heat exchange in the evaporative condenser 8, the temperature of the cooling water is increased, and flows out of the spray water outlet of the evaporative condenser 8 into the first clear water tank 10, fluid with higher temperature in the first clear water tank is pumped into the finished stage freezing pipe 1-10 through the first clear water pump 9 again so as to extract the cold quantity in the next finished stage freezing wall 1-11, and after the cold quantity extraction is finished, the heat exchange with the ammonia system is carried out again through the first pipeline 1-6.
Through practical tests, the well bore freezing is carried out in high-temperature and high-humidity weather, and the cold energy recovery device can reduce the water inlet temperature of the clean water system by 4 ℃ and the exhaust pressure of the compressor by 0.1MPa, so that the safe and stable operation of the ammonia system in a high-temperature and high-humidity environment is realized. Compared with the embodiment 1, the embodiment directly conveys the clear water cooling water with higher temperature after the heat exchange of the ammonia system in the clear water system to the freezing pipe at the finished stage to extract cold energy, and does not depend on the cooling of the heat exchangers 1-9, so that the cold energy extracted from the freezing pipe at the finished stage is higher in utilization efficiency, and meanwhile, the water in the second clear water tank is used for adjusting the quantity and the temperature of the circulating clear water cooling water, so that the inflow temperature of the clear water system is reduced to a greater extent.
Example 3
In this embodiment, in the inclined shaft freezing and cooling capacity recovery device for improving the safe operation of the ammonia system without stopping, the brine system, the ammonia system and the frozen wall cooling capacity extraction system in the finished stage have the same structure as in embodiment 2, and the clear water system is different from embodiment 2 in that: the way of the clean water system for providing cold energy for the high-temperature high-pressure ammonia gas of the ammonia system is a closed type. The working principle of the closed clear water system is shown in fig. 7, and the specific structure is shown in fig. 5.
As shown in fig. 5, the finished stage frozen wall cold extraction system includes a finished stage frozen wall 1-11 and a finished stage frozen pipe 1-10; the clear water system comprises a first clear water pump 9, a first clear water tank 10, heat exchange coils 1-8, an evaporative condenser 8 and a condenser bracket 1-7, wherein the evaporative condenser 8 is fixedly arranged on the condenser bracket 1-7; the cold quantity extracted from the freezing wall in the finished stage is cooled by heat radiation of the ammonia system in the evaporative condenser through the heat exchange coil. The clear water outlet of the first clear water pump 9 is in fluid communication with the fluid inlet of the finished stage freezing pipe 1-10, the fluid outlet of the finished stage freezing pipe 1-10 is in fluid communication with the fluid inlet of the heat exchange coil pipe 1-8 through the first pipeline 1-6, the heat exchange coil pipe 1-8 is positioned in the evaporative condenser 8, the heat exchange coil pipe 1-8 is adjacent to the ammonia coil pipe 1-5 positioned in the evaporative condenser 8, high-temperature and high-pressure ammonia gas of an ammonia system is positioned in the ammonia coil pipe 1-5, the fluid outlet of the heat exchange coil pipe 1-8 is in fluid communication with the fluid inlet of the first clear water tank 10, and the fluid outlet of the first clear water tank 10 is in fluid communication with the fluid inlet of the first clear water pump 9. The fluid outlet of the second clean water tank 1-13 of the clean water system is in fluid communication with the clean water inlet of the second clean water pump 1-12, and the clean water outlet of the second clean water pump 1-12 is in fluid communication with the first pipeline 1-6 through the second pipeline 1-2; a temperature detector 1-3 and a gate valve 14 are sequentially arranged on the second pipeline 1-2 along the fluid flow direction, a temperature detector 1-3, a gate valve 14 and a temperature detector 1-3 are sequentially arranged on the first pipeline 1-6 along the fluid flow direction, and the communication position of the second pipeline 1-2 and the first pipeline 1-6 is positioned between the gate valve 14 on the first pipeline 1-6 and the downstream temperature detector 1-3 on the first pipeline 1-6; the clear water cooling water in the second clear water tank is supplemented into the cooling water circulation of the clear water system to adjust the circulation quantity and the temperature of the cooling water, and the cooling water enters the evaporative condenser along with the clear water cooling water to cool the ammonia system.
The working flow is as follows: the working procedure of this example is basically the same as that of example 2, except that the clean water system exchanges heat with the ammonia system in a closed-type manner, i.e. the heat exchange between the heat exchange coil 1-8 and the ammonia coil 1-5 is used to replace the heat exchange between the spraying mechanism 1-4 and the ammonia coil in example 2.
Through practical tests, the well bore freezing is carried out in high-temperature and high-humidity weather, and the cold energy recovery device can reduce the water inlet temperature of the clean water system by 3 ℃ and the exhaust pressure of the compressor by 0.1MPa, so that the safe and stable operation of the ammonia system in a high-temperature and high-humidity environment is realized.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While the obvious variations or modifications which are extended therefrom remain within the scope of the claims of this patent application.
Claims (3)
1. The inclined shaft freezing and cold energy recovery device capable of improving safe operation of an ammonia system without stopping is characterized by comprising a brine system, an ammonia system, a clean water system and a frozen wall cold energy extraction system in a finished stage, wherein the brine system provides cold energy for frozen walls in an unfinished stage, the ammonia system provides cold energy for low-temperature brine of the brine system, the clean water system provides cold energy for high-temperature and high-pressure ammonia gas of the ammonia system, and the frozen wall cold energy extraction system provides cold energy for the clean water system in the finished stage;
the system for extracting cold of the frozen wall in the finished stage comprises a frozen wall (1-11) in the finished stage, a frozen pipe (1-10) in the finished stage, a brine pump (1-1) in the finished stage and a heat exchanger (1-9) for exchanging heat between brine in the finished stage and clear water in a clear water system; the brine fluid outlet of the finished stage freezing pipe (1-10) is in fluid communication with the brine inlet of the heat exchanger (1-9), the brine outlet of the heat exchanger (1-9) is in fluid communication with the brine inlet of the finished stage brine pump (1-1), the brine outlet of the finished stage brine pump (1-1) is in fluid communication with the brine inlet of the finished stage freezing pipe (1-10), the finished stage freezing pipe (1-10) is positioned in the finished stage freezing wall (1-11), a temperature measuring meter (1-3) is arranged on a pipeline communicated between the heat exchanger (1-9) and the finished stage brine pump (1-1), and a gate valve (14) and the temperature measuring meter (1-3) are sequentially arranged on the pipeline between the finished stage brine pump (1-1) and the finished stage freezing pipe (1-10) along the fluid flow direction in the pipeline;
the clear water system comprises a first clear water pump (9), a first clear water tank (10), a spraying mechanism (1-4), an evaporative condenser (8) and a condenser bracket (1-7), wherein the evaporative condenser (8) is fixedly arranged on the condenser bracket (1-7); the clean water outlet of the first clean water pump (9) is in fluid communication with the clean water inlet of the heat exchanger (1-9), the clean water outlet of the heat exchanger (1-9) is in fluid communication with the spray water inlet of the spray mechanism (1-4), the spray mechanism (1-4) is positioned in the evaporative condenser (8), the spray water outlet of the spray mechanism (1-4) is opposite to an ammonia coil (1-5) positioned in the evaporative condenser (8), high-temperature and high-pressure ammonia gas of the ammonia system is arranged in the ammonia coil (1-5), and the spray water outlet of the evaporative condenser (8) is in fluid communication with the spray water inlet of the first clean water tank (10); a communicating pipe between the heat exchanger (1-9) and the spraying mechanism (1-4) is provided with a thermometer (1-3);
alternatively, the finished stage frozen wall cold extraction system comprises a finished stage frozen wall (1-11) and a finished stage frozen pipe (1-10); the clear water system comprises a first clear water pump (9), a first clear water tank (10), a spraying mechanism (1-4), an evaporative condenser (8) and a condenser bracket (1-7), wherein the evaporative condenser (8) is fixedly arranged on the condenser bracket (1-7);
the clear water outlet of the first clear water pump (9) is in fluid communication with the fluid inlet of the finished stage freezing pipe (1-10), the fluid outlet of the finished stage freezing pipe (1-10) is in fluid communication with the fluid inlet of the spraying mechanism (1-4) through a first pipeline (1-6), the spraying mechanism (1-4) is positioned in the evaporative condenser (8), the spray water outlet of the spraying mechanism (1-4) is opposite to an ammonia coil (1-5) positioned in the evaporative condenser (8), high-temperature and high-pressure ammonia gas of the ammonia system is arranged in the ammonia coil (1-5), the spray water outlet of the evaporative condenser (8) is in fluid communication with the spray water inlet of the first clear water tank (10), and the fluid outlet of the first clear water tank (10) is in fluid communication with the fluid inlet of the first clear water pump (9); the fluid outlet of a second clean water tank (1-13) of the clean water system is in fluid communication with the clean water inlet of a second clean water pump (1-12), and the clean water outlet of the second clean water pump (1-12) is in fluid communication with the first pipeline (1-6) through a second pipeline (1-2); a temperature detector (1-3) and a gate valve (14) are sequentially arranged on the second pipeline (1-2) along the fluid flow direction, the temperature detector (1-3), the gate valve (14) and the temperature detector (1-3) are sequentially arranged on the first pipeline (1-6) along the fluid flow direction, and the communication position of the second pipeline (1-2) and the first pipeline (1-6) is positioned between the gate valve (14) on the first pipeline (1-6) and the downstream temperature detector (1-3) on the first pipeline (1-6);
alternatively, the finished stage frozen wall cold extraction system comprises a finished stage frozen wall (1-11) and a finished stage frozen pipe (1-10); the clear water system comprises a first clear water pump (9), a first clear water tank (10), heat exchange coils (1-8), an evaporative condenser (8) and a condenser bracket (1-7), wherein the evaporative condenser (8) is fixedly arranged on the condenser bracket (1-7);
the clear water outlet of the first clear water pump (9) is in fluid communication with the fluid inlet of the finished stage freezing pipe (1-10), the fluid outlet of the finished stage freezing pipe (1-10) is in fluid communication with the fluid inlet of the heat exchange coil (1-8) through a first pipeline (1-6), the heat exchange coil (1-8) is positioned in the evaporative condenser (8), the heat exchange coil (1-8) is adjacent to an ammonia coil (1-5) positioned in the evaporative condenser (8), high-temperature and high-pressure ammonia gas of the ammonia system is in the ammonia coil (1-5), the fluid outlet of the heat exchange coil (1-8) is in fluid communication with the fluid inlet of the first clear water tank (10), and the fluid outlet of the first clear water tank (10) is in fluid communication with the fluid inlet of the first clear water pump (9); the fluid outlet of a second clean water tank (1-13) of the clean water system is in fluid communication with the clean water inlet of a second clean water pump (1-12), and the clean water outlet of the second clean water pump (1-12) is in fluid communication with the first pipeline (1-6) through a second pipeline (1-2); a temperature measuring meter (1-3) and a gate valve (14) are sequentially arranged on the second pipeline (1-2) along the fluid flow direction, the temperature measuring meter (1-3), the gate valve (14) and the temperature measuring meter (1-3) are sequentially arranged on the first pipeline (1-6) along the fluid flow direction, and the communication position of the second pipeline (1-2) and the first pipeline (1-6) is located between the gate valve (14) on the first pipeline (1-6) and the downstream of the first pipeline (1-6) on the temperature measuring meter (1-3).
2. The non-stop inclined shaft freezing and cold recovery device for improving safe operation of an ammonia system according to claim 1, wherein the brine system comprises an unfinished stage brine pump (1), an unfinished stage brine tank (2), a liquid collecting ring (11), a unfinished stage freezing pipe (12) and a stratum to be frozen (13), the low temperature brine outlet of the unfinished stage brine tank (2) is in fluid communication with the low temperature brine inlet of the unfinished stage brine pump (1), the low temperature brine outlet of the unfinished stage brine pump (1) is in fluid communication with the low temperature brine inlet of the liquid collecting ring (11), the low temperature brine outlet of the liquid collecting ring (11) is in fluid communication with the low temperature brine inlet of the unfinished stage freezing pipe (12), the high temperature brine outlet of the unfinished stage freezing pipe (12) is in fluid communication with the high temperature brine inlet of the liquid collecting ring (11), the high temperature brine outlet of the liquid collecting ring (11) is in fluid communication with the low temperature brine inlet of the evaporator (3) of the ammonia system, and the low temperature brine outlet of the ammonia system is in fluid communication with the unfinished stage freezing pipe (12).
3. The inclined shaft freezing and cold recovery device for improving the safe operation of an ammonia system without stopping the machine according to claim 2, wherein the ammonia system comprises a compressor (4), an oil collector (5), an ammonia storage tank (6) and a siphon tank (7), a first fluid outlet of the evaporator (3) for discharging low-temperature low-pressure ammonia is in fluid communication with a low-temperature low-pressure ammonia inlet of the compressor (4), a high-temperature high-pressure ammonia outlet of the compressor (4) is in fluid communication with a high-temperature high-pressure ammonia inlet of the ammonia coil (1-5), a fluid outlet of the ammonia coil (1-5) is in fluid communication with a fluid inlet of the siphon tank (7), a fluid outlet of the siphon tank (7) is in fluid communication with a fluid inlet of the ammonia storage tank (6), a first fluid outlet of the ammonia storage tank (6) is in fluid communication with a fluid inlet of the oil collector (5), a second fluid outlet of the ammonia storage tank (6) is in fluid communication with a fluid inlet of the evaporator (3), and a fluid outlet of the ammonia storage tank (5) is in fluid communication with a fluid inlet of the low-pressure of the oil collector (5).
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| CN109781843A (en) * | 2018-12-12 | 2019-05-21 | 煤炭科学研究总院 | A kind of frost wall expansion rate ultrasonic detection method |
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| US6796139B2 (en) * | 2003-02-27 | 2004-09-28 | Layne Christensen Company | Method and apparatus for artificial ground freezing |
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| CN109781843A (en) * | 2018-12-12 | 2019-05-21 | 煤炭科学研究总院 | A kind of frost wall expansion rate ultrasonic detection method |
| CN111396115A (en) * | 2020-03-30 | 2020-07-10 | 中国矿业大学 | Cold quantity recycling system for artificial frozen soil layer of freezing construction mine for mine cooling |
| CN111472344A (en) * | 2020-04-28 | 2020-07-31 | 中国矿业大学 | Method for extracting cold energy at inner side of upper freezing wall to strengthen lower freezing |
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