CN111677053A - Cold region tunnel fire pipeline anti-freezing heat preservation system utilizing geothermal energy - Google Patents
Cold region tunnel fire pipeline anti-freezing heat preservation system utilizing geothermal energy Download PDFInfo
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- CN111677053A CN111677053A CN202010442411.1A CN202010442411A CN111677053A CN 111677053 A CN111677053 A CN 111677053A CN 202010442411 A CN202010442411 A CN 202010442411A CN 111677053 A CN111677053 A CN 111677053A
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/09—Component parts or accessories
- E03B7/10—Devices preventing bursting of pipes by freezing
- E03B7/12—Devices preventing bursting of pipes by freezing by preventing freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
- F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
- F24T10/17—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes using tubes closed at one end, i.e. return-type tubes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention relates to a cold region tunnel fire pipeline anti-freezing heat preservation system utilizing geothermal energy, which comprises: the heat exchange tube is drilled, buried in the deep part of the surrounding rock of the tunnel through the drill hole and used for absorbing geothermal energy; the water inlet main pipe is connected with the inlet of the drilled heat exchange pipe and is used for introducing low-temperature water; the water outlet main pipe is connected with the outlet of the drilling heat exchange pipe and is used for discharging high-temperature water; the water supply pipe is connected between the fire fighting pipeline and the water outlet main pipe and is used for introducing high-temperature water into the fire fighting pipeline; and the backheating water pipe is connected between the fire fighting pipeline and the water inlet main pipe, and a circulating pumping unit is arranged in the backheating water pipe and used for circulating the low-temperature water in the fire fighting pipeline into the drilling heat exchange pipe. The invention utilizes the ground temperature of the surrounding rock of the tunnel to circularly heat the water in the fire fighting pipe, only needs to provide the electric power required by the water pump to drive the water circulation, and the water pump mainly overcomes the on-way resistance of the heat-preservation water supply and return pipes to do work, has small energy consumption and greatly reduces the operation cost.
Description
Technical Field
The invention belongs to the technical field of tunnel fire safety, and particularly relates to an anti-freezing and heat-insulating system for a cold region tunnel fire pipeline by using geothermal energy.
Background
Fire hydrant systems are widely used in the design of fire protection systems for long and large highway tunnels as timely and effective fire suppression systems. However, in cold regions, fire hydrant systems in tunnels face the problem that water in fire fighting pipe networks freezes under low temperature environments, resulting in system failure.
The common anti-freezing and heat-insulating measures of the fire-fighting pipeline in the tunnel comprise a pipeline heat-insulating layer, an electric heat tracing heating technology, an anti-freezing liquid filling technology and the like. The cost of laying the heat preservation layer is low, the construction and maintenance are convenient, but the anti-freezing and heat preservation effects are limited, and the anti-freezing is difficult to realize under the extremely low temperature condition in winter. Although the initial investment is small, the filling of the antifreeze solution needs to ensure that the antifreeze solution has no combustion-supporting property, flammability and toxicity during implementation, and simultaneously solves the technical problems of absorbing the expansion amount of the antifreeze solution during temperature rising, filling the contraction amount of the antifreeze solution during temperature lowering and the like. The electric tracing heating technology has high requirements on electric heating devices and corresponding supporting facilities, the early-stage capital investment is high, the whole-process monitoring and control is needed in the working process of a tracing system, the later-stage operation and maintenance cost is high, the electric tracing has the characteristics of slow temperature rise, fast temperature reduction, more power consumption and high heat loss, the service life is short, and the electric tracing heating technology still has great application limitation.
One direction to reduce the investment and operating cost of antifreeze engineering for the pipe network of the fire hydrant system in cold regions is to utilize natural energy. The water-discharging heat-insulating technology is a technology for preventing pipeline from freezing by using ground temperature, and is characterized by that the water whose temp. in the pipe is lower than set temp. is placed in underground recharge well, and the ground temperature is used to raise temp. of said water, and the water whose underground temp. is higher is pumped into fire-fighting pipeline from water-taking well. However, the waterway circulation path of the technology is not closed, the seepage path of the underground water is complicated, the discharged water cannot completely permeate to the position of the water taking well, the water is difficult to continue after a plurality of times of water pumping and discharging circulation, and the water temperature return effect is difficult to ensure due to the complexity of the underground seepage, so that higher ground temperature conditions are required. On the other hand, frequent water pumping and draining can damage the in-situ water seepage environment, and serious consequences such as settlement, collapse and the like can occur. Therefore, there is a need for a fire fighting pipeline anti-freezing and thermal insulation system with wider application range, low cost and running cost, less influence on environment and more effective utilization of ground temperature energy.
Patent CN 106498827a discloses an energy tunnel combined type geothermal energy anti-freezing heating system, however, this patent utilizes geothermal energy through the longitudinal heat exchange tubes laid between the primary lining and the secondary lining of the tunnel, between the inverted arch and the backfill layer, mainly heats the tunnel lining, in view of the restriction of the position of the heat exchange layer, this patent method of utilizing geothermal energy can only exchange the heat energy of the surrounding rock of the shallow layer of the tunnel, and this part of heat energy is easily affected by driving in the tunnel, ventilation, etc., the quantity is lower and unstable, therefore, a heat pump is needed to transport extra energy, and the geothermal energy is difficult to supplement in the long-term operation working condition.
Disclosure of Invention
The invention aims to solve the problem that water in a highway tunnel fire-fighting pipe network in a cold region is frozen in a low-temperature environment, and provides an anti-freezing heat-preservation system for a tunnel fire-fighting pipeline in the cold region by using geothermal energy, so as to overcome the defects of extremely low-temperature applicability, long-period reliability, engineering investment effectiveness and the like of the existing anti-freezing heat-preservation technology.
The purpose of the invention is realized by the following technical scheme:
the utility model provides an utilize cold district tunnel fire pipeline heat preservation system that prevents frostbite, includes:
the heat exchange tube is drilled, buried in the deep part of the surrounding rock of the tunnel through the drill hole and used for absorbing geothermal energy;
the water inlet main pipe is connected with the inlet of the drilled heat exchange pipe and is used for introducing low-temperature water;
the water outlet main pipe is connected with the outlet of the drilling heat exchange pipe and is used for discharging high-temperature water;
the water supply pipe is connected between the fire fighting pipeline and the water outlet main pipe and is used for introducing high-temperature water into the fire fighting pipeline; and
and the backheating water pipe is connected between the fire fighting pipeline and the water inlet main pipe, and a circulating pumping unit is arranged in the backheating water pipe and used for circulating the low-temperature water in the fire fighting pipeline into the drilling heat exchange pipe.
The drilling heat exchange tube, the water inlet main pipe, the hot water supply tube, the fire fighting pipeline, the heat return water pipe and the water outlet main pipe form a circulation loop, the circulation flow of water in the circulation loop is realized under the action of the circulation pumping unit, the drilling heat exchange tube is embedded into the deep part of the surrounding rock of the tunnel, continuously absorbs geothermal energy, and conveys the geothermal energy to the fire fighting pipeline for freeze protection and heat preservation of the fire fighting pipeline of the tunnel in a cold region.
Furthermore, the drilling heat exchange tubes are one or more groups of U-shaped tube heat exchangers buried in the deep position of the surrounding rock of the tunnel through drilling, and the inlet and the outlet of each U-shaped tube heat exchanger are respectively connected with the water inlet header pipe and the water outlet header pipe.
Further, the position and the quantity of the drilling heat exchange tubes are adjusted according to the ground temperature environment and the construction conditions of the tunnel so as to achieve optimal heat exchange efficiency, and the drilling holes are arranged along the radial direction of the tunnel surrounding rock.
Further, the circulating pumping unit comprises a circulating water pump and a water pump controller connected with the circulating water pump.
Further, the circulating water pump adopts a heat pump, and when the temperature of the tunnel surrounding rock is not high enough, water in the pipeline can be heated for the second time through the heat pump and then supplied to the heating section.
Furthermore, electric valves are respectively arranged on the hot water supply pipe and the heat return water pipe;
the fire fighting pipeline is respectively provided with a water temperature sensor at the joint of the fire fighting pipeline and the hot water supply pipe and at the joint of the fire fighting pipeline and the heat return water pipe;
the water pump controller is electrically connected with the electric valve and the water temperature sensor respectively;
and the water pump controller, the water temperature sensor, the electric valve and the circulating water pump form an automatic control system for system operation. The water temperature sensor measures the temperature of water entering the fire fighting pipeline from the hot water supply pipe, and when the temperature of the water is lower than a set temperature, the water pump controller starts the water pump to pump water; the water temperature sensor measures the water temperature in the fire water pipe, which is about to flow into the regenerative water pipe, the water temperature at the position is relatively low, and when the water temperature at the position is higher than the set temperature, the water pump controller closes the water pump to stop pumping water, so that the system can be controlled to stop.
Furthermore, the water supply pipe and the heat return water pipe are water flowing pipes coated with heat insulation materials.
Furthermore, the water outlet of the hot water supply pipe and the water inlet of the heat return water pipe are respectively communicated with the fire fighting pipeline through a tee joint.
Furthermore, the water inlet main pipe and the water outlet main pipe are positioned between the secondary lining and the primary lining of the tunnel wall, the tunnel wall is annularly arranged, and the fire fighting pipelines are arranged in a fire fighting pipe ditch at the bottom of the tunnel wall; the circulating pumping unit is arranged in a hole reserved or dug in the tunnel wall. When the drilling heat exchange pipe is used for heating a fire pipeline at the opening section of the hole, the heat exchange pipe is buried in the hole from the ground surface through drilling; when the fire pipeline of heating tunnel body section, from the tunnel bottom downwards, from tunnel lateral wall or vault to the drilling of country rock depths set up the heat exchange tube.
According to the intelligent water circulation anti-freezing heat preservation system for the highway tunnel fire fighting pipeline in the cold region, the water in the fire fighting pipe is heated by utilizing the ground temperature circulation of the surrounding rock of the tunnel, although the expenses of drilling, a water pump device and the like are required to be increased in the early construction and installation stage, the electric power required by the water pump for driving the water circulation is only required to be provided in the later operation process, and the water pump mainly overcomes the on-way resistance of the heat preservation water supply and return pipes to do work, so that the energy consumption is low, and compared with the electric tracing technology, the operation expense is greatly.
Compared with the prior art, the invention has the following beneficial effects:
1. the circulation process is through the heat transfer of flow of high low temperature water with heat preservation of preventing frostbite, and is more gentle even than electric tracing heating process, and electric tracing technique need be equipped with special cable short circuit monitor, alarm, temperature controller etc. and control system is complicated, and the inefficacy risk is high, and the result of inefficacy is very serious, and this system only need opening and closing of automatic control circulating water pump, and is simple effective, even inefficacy also can not bring big hidden danger for tunnel fire control safety.
2. Compared with the common water drainage and heat preservation technology, the system provides a closed circulation mode independent of underground seepage, a deep well and a high-lift water pump do not need to be drilled, the circulation process is automatically started or stopped according to the real-time water temperature in the fire fighting pipeline, and the mechanical circulation of the common water drainage and heat preservation technology at fixed time intervals is replaced, so that the underground water environment is not influenced.
3. The system has the advantages that the utilization of terrestrial heat is more effective, the engineering investment is not high, the fire control water supply is influenced in the general water drainage and heat preservation process under the fire working condition, the fire rescue is extremely unfavorable, and the flow of a fire pipeline is not changed in the water circulation process of the system, so that the fire rescue is not hindered.
4. From the long-term anti-freezing effect, the economy and the reliability of the technology of the invention are superior to those of an electric heat tracing system and a common water-discharging heat-preserving technology.
5. The system has great advantages in the aspects of applicability and economy, and the position and the number of the heat-taking part, namely the drilled heat exchange tube of the system can be flexibly adjusted according to the ground temperature environment and the construction conditions of the tunnel so as to achieve the optimal heat exchange efficiency.
6. The invention has wide applicable environmental temperature range, improves the heat exchange cycle frequency and reduces the heat exchange loss by additionally arranging the drilling heat exchange pipe, and can ensure the normal work of a fire-fighting pipe network system at lower temperature.
7. The heat supply part can pertinently heat the part with the lowest temperature of the fire-fighting pipe network of the tunnel, and the system is operated by the actually measured temperature parameter controller, so that the efficiency is high, the system is operated only by overcoming the on-way resistance of the pipeline circulation system, the power consumption is low, the environment is not greatly influenced, and the system is energy-saving and environment-friendly.
8. The heat exchange pipe penetrates into the deep surrounding rock with high and stable heat energy through the drill hole, the continuous and reliable heat source is ensured, the heat exchange efficiency is improved through reasonably arranging the number of the buried pipe groups, the heat exchange part adopts a convection heat exchange method, the heat energy utilization rate is high, the anti-freezing heat-insulation design aims at the anti-freezing heat-insulation pipeline in the tunnel, and the main mode of utilizing geothermal energy is the drill hole buried pipe heat exchange.
Drawings
FIG. 1 is a schematic view of an anti-freezing and heat-insulating system for a fire pipeline of a highway tunnel in a cold region by using geothermal energy;
in the figure: 1-drilling a heat exchange tube; 2, drilling; 3-drilling and backfilling; 4-a water outlet main pipe; 5-a water inlet main pipe; 6-fire fighting pipe trench; 7-a hot water supply pipe; 8-a tee joint; 9-a fire-fighting pipeline; 10-a regenerative water pipe; 11-a circulating water pump; 12-a water pump controller; 13-a low temperature water temperature sensor; 14-high temperature water temperature sensor; 15-an electrically operated valve; 16-an electrical wire; 17-holes; 18-tunnel sidewalls; 19-two liners; 20-primary lining.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Referring to fig. 1, in order to solve the problem that water in a highway tunnel fire-fighting pipe network in a cold region freezes in a low-temperature environment, the invention provides an anti-freezing and heat-preserving system for a tunnel fire-fighting pipe in the cold region by using geothermal energy, so as to overcome the defects of extremely low-temperature applicability, long-period reliability, engineering investment effectiveness and the like of the existing anti-freezing and heat-preserving technology.
As in fig. 1, the system comprises:
the heat exchange tube 1 is drilled, buried in the deep of the surrounding rock of the tunnel through the drill hole 2 and used for absorbing geothermal energy;
the water inlet main pipe 5 is connected with an inlet of the drilling heat exchange pipe 1 and is used for introducing low-temperature water;
the water outlet header pipe 4 is connected with the outlet of the drilling heat exchange pipe 1 and is used for discharging high-temperature water;
the hot water supply pipe 7 is connected between the fire fighting pipeline 9 and the water outlet main pipe 4 and is used for introducing high-temperature water into the fire fighting pipeline 9; and
and the heat return water pipe 10 is connected between the fire pipeline 9 and the water inlet main pipe 5, and a circulating pumping unit is arranged in the heat return water pipe 10 and used for circulating low-temperature water in the fire pipeline 9 to the drilling heat exchange pipe 1.
The drilling heat exchange tube 1 is a group or a plurality of groups of U-shaped tube heat exchangers buried in the deep part of the surrounding rock of the tunnel through the drilling hole 2, the inlet and the outlet of the U-shaped tube heat exchanger are respectively connected with a water inlet header pipe 4 and a water outlet header pipe 4, the drilling heat exchange tube 1 adjusts the position and the quantity of the drilling heat exchange tube according to the ground temperature environment and the construction conditions of the tunnel, the drilling hole 2 is arranged along the radial direction of the surrounding rock of the tunnel, and the drilling hole backfill material 3 with good heat conductivity coefficient is backfilled.
The circulating pumping unit comprises a circulating water pump 11 and a water pump controller 12 connected with the circulating water pump 11, the circulating water pump 11 adopts a heat pump, and electric valves 15 are respectively arranged on the hot water supply pipe 7 and the heat return water pipe 10; water temperature sensors are respectively arranged at the connection part of the fire pipeline 9 and the hot water supply pipe 7 and the connection part of the fire pipeline 9 and the regenerative water pipe 10; the water pump controller 12 is respectively electrically connected with the electric valve 15 and the water temperature sensor through electric wires 16; the water pump controller 12, the water temperature sensor, the electric valve 15 and the circulating water pump 11 form an automatic control system for system operation.
The hot water supply pipe 7 and the heat return water pipe 10 are water supply pipelines coated with heat insulation materials, and the water outlet of the hot water supply pipe 7 and the water inlet of the heat return water pipe 10 are respectively communicated with the fire fighting pipeline 9 through a tee joint 8. The water inlet main pipe 4 and the water outlet main pipe 4 are positioned between a secondary lining 19 and a primary lining 20 of the tunnel wall, the tunnel wall is annularly arranged, and the fire fighting pipelines 9 are arranged in the fire fighting pipe trench 6 at the bottom of the tunnel wall; the circulation pumping unit is arranged in a hole 17 reserved or excavated in the tunnel wall. When the heat exchange pipe 1 is drilled and arranged at the fire pipeline 9 at the opening section of the hole, the heat exchange pipe is buried in the hole from the ground surface through drilling; when the fire pipeline 9 of the tunnel body section is heated, heat exchange pipes are drilled from the bottom of the tunnel downwards and from the side wall 18 or the vault of the tunnel to the depth of the surrounding rock.
The hot water supply pipe 7 and the heat return pipe 10 are led out from fire-fighting pipelines through tee joints 8 at two ends, the hot water supply pipe 7 is connected with a water outlet main pipe, the heat return pipe is connected with a water inlet main pipe and is arranged in a pipe ditch at one side in a tunnel together with a fire fighting pipeline, a heat preservation layer is applied outside the heat supply pipe and the heat return pipe, and the purpose of heat preservation is to reduce the heat energy loss in the circulation process.
The water inlet and outlet header pipes of the drilling heat exchange tube are connected in parallel between the U-shaped heat exchange tubes of each group, are positioned between the secondary lining 19 and the primary lining 20 and are annularly arranged along the side wall 18 of the tunnel. The heat exchange pipes can be embedded outside the holes from the ground surface in a drilling way when the fire-fighting pipeline at the opening section of the hole is heated; when heating shaft section fire control pipeline, can follow the tunnel bottom downwards, set up the heat exchange tube to the drilling of country rock depths from tunnel lateral wall and vault. In order to ensure the heat exchange efficiency, the distance between the effective heat exchange parts of each heat exchange tube is 3-6m according to the engineering technical specification of a ground source heat pump system (GB 50366-. The heat exchange amount of the system depends on the ground temperature value, so that when the temperature of the tunnel surrounding rock is not high enough, the water in the heat taking pipe can be heated again by the heat pump and then supplied to the heating section.
The circulating water pump drives the system to operate circularly, and the water in the pipe is maintained to flow only by overcoming the on-way resistance of the water flowing in the pipeline, so that the pressure and the flow of the water pump are not large. The small-volume water pump can meet the use requirement of the system, so the water pump is arranged in the water pump box and the water pump box is arranged in a hole reserved or dug on the tunnel wall, and the installation of the water pump is similar to that of the fire hydrant box.
The low-temperature water temperature sensor 13 measures the temperature of water entering the fire fighting pipeline from the hot water supply pipe, and when the temperature of the water at the position is lower than a set temperature, the water pump controller starts the water pump to pump water; the high-temperature water temperature sensor 14 measures the temperature of water in the fire hose which is about to flow into the regenerative water pipe, the temperature of the water at the position is relatively low, and when the temperature of the water at the position is higher than a set temperature, the water pump controller closes the water pump to stop pumping the water, so that the system can be controlled to stop.
The electric valve 15 is provided with three positions which are respectively positioned at the outlet of the hot water supply pipe 7, the inlet of the heat return water pipe 10 and the position near the water pump water outlet, the opening and the closing of the water pump are controlled by a water pump controller, the water pump can be started after the valve is opened, the valve can be closed after the water pump is stopped, wherein the first electric valve and the second electric valve are used for ensuring that water in an external circulation pipeline of the system can not flow in series with a fire pipeline when the system does not run and a heating section pipeline is overhauled, the second electric valve and the third electric valve are convenient to be arranged when the circulating water pump is overhauled, the influence on a drilling heat exchange pipe can not be generated.
The water pump controller is also connected to a tunnel fire-fighting alarm system, when a fire is found and an alarm is given out, the controller forcibly stops the water pump to close the valve, and the system does not run during the fire rescue period; the electric valve is beneficial to the safe operation and convenient maintenance of the system.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The utility model provides an utilize cold district tunnel fire pipeline heat preservation system that prevents frostbite which geothermal energy can, includes:
the drilled heat exchange tube (1) is buried in the deep of the surrounding rock of the tunnel through a drilled hole (2) and is used for absorbing geothermal energy;
the water inlet main pipe (5) is connected with an inlet of the drilled heat exchange pipe (1) and is used for introducing low-temperature water;
the water outlet main pipe (4) is connected with an outlet of the drilling heat exchange pipe (1) and is used for discharging high-temperature water;
the hot water supply pipe (7) is connected between the fire fighting pipeline (9) and the water outlet main pipe (4) and is used for introducing high-temperature water into the fire fighting pipeline (9); and
the heat recovery water pipe (10) is connected between the fire pipeline (9) and the water inlet main pipe (5), and a circulating pumping unit is arranged in the heat recovery water pipe (10) and used for circulating low-temperature water in the fire pipeline (9) to the inside of the drilling heat exchange pipe (1).
2. The anti-freezing and heat-insulating system for the tunnel fire pipeline (9) in the cold region by using the geothermal energy as claimed in claim 1, wherein the drilled heat exchange pipes (1) are one or more groups of U-shaped heat exchangers buried deep in the surrounding rock of the tunnel through drilled holes (2), and the inlet and outlet of each U-shaped heat exchanger are respectively connected with the water inlet header pipe (4) and the water outlet header pipe (4).
3. The anti-freezing and heat-insulating system for the cold-region tunnel fire pipeline (9) by utilizing geothermal energy as claimed in claim 2, wherein the position and the number of the drilled heat exchange pipes (1) are adjusted according to the geothermal environment and construction conditions of the tunnel, and the drilled holes (2) are arranged along the radial direction of the surrounding rock of the tunnel.
4. The anti-freezing and heat-preserving system for the cold-region tunnel fire pipeline (9) by using geothermal energy as claimed in claim 1, wherein the circulating pumping unit comprises a circulating water pump (11) and a water pump controller (12) connected with the circulating water pump (11).
5. The anti-freezing and heat-insulating system for the cold-region tunnel fire-fighting pipeline (9) by using the geothermal energy as claimed in claim 4, wherein the circulating water pump (11) adopts a heat pump.
6. The anti-freezing and heat-insulating system for the cold-region tunnel fire-fighting pipeline (9) by using geothermal energy is characterized in that electric valves (15) are respectively arranged on the hot water supply pipe (7) and the heat recovery water pipe (10);
water temperature sensors are respectively arranged at the connection part of the fire fighting pipeline (9) and the hot water supply pipe (7) and the connection part of the fire fighting pipeline (9) and the heat return water pipe (10);
the water pump controller (12) is electrically connected with the electric valve (15) and the water temperature sensor respectively;
the water pump controller (12), the water temperature sensor, the electric valve (15) and the circulating water pump (11) form an automatic control system for system operation.
7. The anti-freezing and heat-insulating system for the cold-region tunnel fire pipeline (9) by using geothermal energy as claimed in claim 1, wherein the hot water supply pipe (7) and the heat recovery water pipe (10) are both water running pipes coated with heat-insulating materials.
8. The anti-freezing and heat-insulating system for the cold-region tunnel fire-fighting pipeline (9) by using geothermal energy as claimed in claim 1, wherein the water outlet of the hot water supply pipe (7) and the water inlet of the heat recovery water pipe (10) are respectively communicated with the fire-fighting pipeline (9) through a tee joint (8).
9. The cold region tunnel fire fighting pipeline (9) anti-freezing and heat preservation system according to any one of claims 1 to 8, wherein the water inlet and outlet main pipes (4) are located between the secondary lining (19) and the primary lining (20) of the tunnel wall, the tunnel wall is arranged annularly, and the fire fighting pipeline (9) is arranged in the fire fighting pipe ditch (6) at the bottom of the tunnel wall; the circulating pumping unit is arranged in a hole (17) reserved or dug in the tunnel wall.
10. The anti-freezing and heat-insulating system for the fire fighting pipeline (9) of the cold region tunnel by utilizing the geothermal energy as claimed in claim 9, wherein the drilled heat exchange pipe (1) is buried outside the tunnel from the surface of the ground by drilling when the fire fighting pipeline (9) at the entrance section of the tunnel is heated; when the fire-fighting pipeline (9) of the tunnel body section is heated, a heat exchange pipe is drilled from the bottom of the tunnel downwards and from the side wall (18) or the vault of the tunnel to the depth of the surrounding rock.
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| CN208547147U (en) * | 2018-07-03 | 2019-02-26 | 中国地质大学（北京） | A kind of underground buried tube heat-exchanger rig |
| CN110359334A (en) * | 2019-07-10 | 2019-10-22 | 苏交科集团股份有限公司 | The ice melting system of tunnel road surface |
| CN110486038A (en) * | 2019-09-05 | 2019-11-22 | 西南交通大学 | A kind of the heat self-balancing system and its construction method of tunnel in cold area freeze injury prevention and control |
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Application publication date: 20200918 |