CN109162166B - Cement concrete pavement ice melting system comprehensively utilizing geothermal electric heat and construction method - Google Patents
Cement concrete pavement ice melting system comprehensively utilizing geothermal electric heat and construction method Download PDFInfo
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- CN109162166B CN109162166B CN201811230406.3A CN201811230406A CN109162166B CN 109162166 B CN109162166 B CN 109162166B CN 201811230406 A CN201811230406 A CN 201811230406A CN 109162166 B CN109162166 B CN 109162166B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/24—Methods or arrangements for preventing slipperiness or protecting against influences of the weather
- E01C11/26—Permanently installed heating or blowing devices ; Mounting thereof
- E01C11/265—Embedded electrical heating elements ; Mounting thereof
Abstract
The invention provides a cement concrete pavement ice melting system comprehensively utilizing geothermal electric heat and a construction method thereof. The cement concrete road is additionally provided with a heat insulation layer between a road surface layer and a base layer of a traditional structure; the geothermal system transfers the geothermal heat provided by the ground source heat pump device to the road pavement layer by utilizing the geothermal heat exchange tube to realize the preheating function; the electric heating system provides heat energy to the road pavement layer through the embedded electric heating wire by utilizing external electric power so as to realize the function of melting ice and snow of the whole system. The system can be automatically opened and closed according to temperature change, the heating efficiency is automatically controlled, geothermal energy can be fully utilized, the defect that severe cold regions cannot provide enough geothermal energy is avoided, the system is more environment-friendly and economical, and actual engineering requirements are met more.
Description
Technical Field
China is vast in territory, severe ice and snow problems are often faced in winter in the north, particularly the problem of ice and snow accumulation and removal on road surfaces always troubles traffic management departments at all levels, and direct and indirect economic losses caused by the ice accumulation on the road surfaces reach hundreds of millions of yuan every year. All countries in the world pay attention to the problem of treating the road accumulated snow and ice for a long time, a large number of related experimental researches are carried out, and various technical methods for treating the road accumulated snow and ice are explored. In summary, the methods for managing the accumulated snow and the ice on the road surface mainly include two types, namely a removing method and a melting method: 1) the removal methods can be classified into manual removal and mechanical removal, and 2) the melting method is classified into a chemical method and a thermal melting method. The thermal melting method utilizes heat generated by geothermy, electric heat, fuel gas and the like to melt ice and snow on the road surface, wherein the geothermy melts the snow and is greatly concerned by the scientific research and engineering fields due to the advanced performance of environmental protection and energy saving. The earth continuously releases heat energy from the deep underground to the earth surface and the external space, the shallow geothermal resource is an inexhaustible renewable energy, and meanwhile, the shallow geothermal resource does not produce any pollution while having high economic benefit, and is a sustainable development green energy with high environment protection and high benefit. However, in northern areas of China with severe winter climate and snowfall, the heat exchange efficiency of geothermal energy is often not enough to melt snow and ice, the heat energy efficiency can only raise the temperature of the road surface to above 0 ℃, the geothermal energy can only play a role in preheating, and if the complete melting of the snow and ice on the road surface is required, other forms of heating energy are also required to be supplemented.
At present, a plurality of different methods are adopted for melting snow and ice on important road sections of high-grade roads, expressway toll stations, gas stations in high-speed service areas, airport take-off and landing runways and the like, a large amount of electric energy is consumed if only one electric energy is used for providing energy for melting the snow and ice, unnecessary waste is caused, if only one geothermal heat is used for melting the snow and ice, the bottleneck of local geothermal resources can be limited, and under the condition of low temperature, enough ice melting heat cannot be provided, so that the purpose of melting the snow and ice cannot be realized. In conclusion, the technological method for melting snow and ice by comprehensively utilizing electric heat and terrestrial heat can be used as a new research direction and application field, and the development of a ice melting system for cement concrete road pavement and a matched construction method thereof are urgently needed.
Disclosure of Invention
The invention aims to provide a cement concrete pavement ice melting system comprehensively utilizing geothermal heat and electricity aiming at the defects of the traditional electrothermal concrete ice melting system, and simultaneously provides a matched construction method of the cement concrete pavement ice melting system to meet the practical requirement of deicing of roads in severe cold areas in north China where ice is easy to accumulate.
In order to achieve the above object, the present invention provides the following technical solutions:
the ice melting system for the cement concrete pavement comprehensively utilizing geothermal electric heat comprises a cement concrete road structure, a geothermal system and an electric heating system;
the cement concrete road structure is a basic structure of a road, is also an object for a geothermal system and an electric heating system to exert deicing functions, and can be divided into the following parts from top to bottom according to basic forms: the geothermal system and the electric heating system are used for transferring heat to the cement concrete pavement layer, and the cement concrete pavement layer transfers the heat to the ice and snow layer covered on the cement concrete pavement layer to melt the ice and snow so as to realize the function of melting ice and snow of the whole system;
the geothermal system is a functional system which utilizes geothermal energy of shallow soil to provide heat energy for a cement concrete road structure and comprises a ground source heat pump device, a circulating water pump, a first electric valve, a first automatic control device, a first temperature sensor and a geothermal heat exchange tube;
the ground source heat pump device is of a pile valve type structure and consists of heat collecting and storing piles and a heat collecting raft plate at the top, and the ground source heat pump device has the functions of absorbing and utilizing geothermal energy of shallow soil so as to achieve the purpose of heating water flow in a geothermal heat exchange pipe; the geothermal heat exchange tubes are arranged between the cement concrete road surface layer and the heat insulation layer in an overlapped S shape, circulating water flowing in the geothermal heat exchange tubes transfers heat provided by the ground source heat pump device to the cement concrete road surface layer above the geothermal heat exchange tubes, and the heat insulation layer below the geothermal heat exchange tubes obstructs a path for transferring the heat downwards, so that the geothermal heat exchange tubes can transfer heat of a large department to the cement concrete road surface layer to improve the energy conversion rate of a geothermal system;
the ground source heat pump device is connected with the inlet and the outlet of the heat exchange pipeline through pipelines respectively to form a closed circulating loop, so that circulating water is not leaked in the working process of the whole geothermal system, and the circulating water is not required to be supplemented;
a closed loop of the geothermal system is also provided with a circulating water pump, a first electric valve, a first automatic control device and a first temperature sensor; the circulating water pump is an electrically driven mechanical device and has the functions of providing power for water flow in the geothermal heat exchange pipe, enabling the heat exchange water flow to stably flow, timely and efficiently transferring geothermal energy obtained by the ground source heat pump device to a cement concrete road surface layer, and achieving the heat exchange purpose of the whole geothermal system; the first electrovalve is a valve controlled by the first automatic control device, the flow of heat exchange water flow can be controlled by opening and closing the first electrovalve, if the system needs emergency shutdown in case of emergency, the flow of water in the geothermal heat exchange pipe can be stopped by the first electrovalve, and the geothermal system stops working; the first automatic control device is a control component for controlling the geothermal system; the first temperature sensor is a temperature sensor for measuring the temperature of the circulating water and transmits a circulating water temperature signal to the first control device; the first control device receives the temperature signal of the first temperature sensor in real time, directly controls the first electrovalve through internal logic judgment, controls the flow and stop of circulating water, and realizes the on and off of the geothermal system;
the electric heating system is a functional system which utilizes external electric power to provide heat energy for the cement concrete pavement layer through the embedded electric heating wire, and comprises a second automatic control device, a second temperature sensor, a second electrovalve and an electric heating wire; the electric heating wires are embedded in the cement concrete pavement layer and arranged above the geothermal heat exchange tubes of the geothermal system in an overlapped S shape, electric energy is converted into heat energy through an external power supply to supply heat to the cement concrete pavement layer, and the arrangement density of the electric heating wires is higher than that of the geothermal heat exchange tubes because the outer diameter of the electric heating wires is smaller than that of the heat exchange tubes, namely, the wiring intervals of the electric heating wires are smaller; the second automatic control device, the second temperature sensor, the second electrovalve and the electric heating wire are connected to form a closed loop, the second electrovalve is a valve controlled by the second automatic control device, the on and off of electric power in the electric heating wire can be controlled through the on and off of the second electrovalve, the magnitude of the current of the electric heating wire can also be controlled, and further the heating efficiency is controlled, if the system needs to be shut down emergently when meeting an emergency, the electric heating system can stop working through the second electrovalve; the second automatic control device is a control component for controlling the electric heating system; the second temperature sensor is a sensor for measuring the surface temperature, and a temperature signal is transmitted to the second control device; the second control device receives the temperature signal of the second temperature sensor in real time, and directly controls the second electrovalve through internal logic judgment to control the on and off of the electric heating system and the heat exchange rate of the electric heating system.
The invention provides a cement concrete pavement ice melting system comprehensively utilizing geothermal electric heat, which comprises the following matched construction methods:
(1) according to the technical specification and the requirements of the construction process of the road cement concrete road root surface, after the road base layer is laid, a heat insulation material is laid on the road base layer to form a heat insulation layer;
(2) placing a steel wire mesh (the size of the mesh can be but is not limited to 10cm multiplied by 10cm, and is determined according to actual requirements), binding and fixing the geothermal heat exchange tubes on the steel wire mesh, so that the geothermal heat exchange tubes are arranged in an overlapped S-shaped plane, and the arrangement density and the tube spacing of the geothermal heat exchange tubes are determined according to the actual requirements;
(3) continuously pouring cement concrete with a certain thickness, after the maintenance is finished, carving an overlapped S-shaped groove on the surface of the cement concrete, arranging electric heating wires in the groove, and determining the arrangement density and the wire spacing of the electric heating wires according to actual requirements;
(4) continuously pouring cement concrete with a certain thickness to enable the cement concrete pavement layer to reach the designed elevation, and finishing the final maintenance of the pavement structure;
(5) a ground source heat pump device, a circulating water pump, a first electric valve, a first automatic control device and a first temperature sensor are arranged outside the road structure and connected with a geothermal heat exchange tube to form a closed loop, so that the debugging of a geothermal system is completed; installing a second automatic control device, a second temperature sensor and a second electrovalve outside the road structure, connecting an electric heating wire to form a closed loop, and injecting circulating water to finish the debugging and acceptance of the geothermal system; finally, debugging and acceptance of the whole geothermal electric heating comprehensively utilized ice melting system of the cement concrete pavement are completed.
The working process of the invention is as follows: after the snowfall starts in winter, the temperature drop speed of the cement concrete road is generally lower than the temperature drop, and when the temperature of the surface of the cement concrete road is reduced to be close to 5 ℃, the geothermal system is automatically started to work to preheat the cement concrete road surface layer; if the cement concrete pavement layer is further reduced and approaches to 0 ℃, starting the electric heating system to further heat the cement concrete pavement layer; through the public work of geothermal system and electric heating system, make the temperature of cement concrete pavement layer keep more than 0 ℃ all the time to realize the function of melting ice and snow.
Compared with the prior art, the invention has the beneficial effects that: compared with the technology of melting ice and snow by using an electric heating method singly, the invention can fully utilize geothermal energy, reduce electric energy consumption and is more environment-friendly and economical; compared with the technology of using the geothermal method singly, the defect that the area in the area with extremely severe cold or large snowfall amount in winter can not provide enough geothermal energy is avoided, the ice accumulation on the road surface can be avoided, and the function of melting ice and snow is realized. In addition, the system can be operated only when ice and snow are melted in winter, a summer heat storage mode can be supplemented, and a large amount of heat sources can be stored in the ground source heat pump device in summer for ice and snow melting in winter.
Drawings
FIG. 1 is a schematic view of the heat generating line and heat exchanging pipe of the present invention embedded therein.
FIG. 2 is a cross-sectional view of the heat generating wire and heat pipe embedded in the present invention.
Fig. 3 is a schematic view showing the embedment of the heating wire 10 of the present invention in a cement concrete pavement layer.
Fig. 4 is a plan view of the geothermal heat exchange pipe 11 of the present invention in a cement concrete pavement layer.
Reference numbers in the figures: the heat exchanger comprises a ground source heat pump device 1, a circulating water pump 2, a first electric valve 3, a first automatic control device 4, a first temperature sensor 5, a geothermal heat exchange tube 6, a second automatic control device 7, a second temperature sensor 8, a second electric valve 9, an electric heating wire 10, a cement concrete pavement layer 11, a heat insulation layer 12, a road base layer 13, a road cushion layer 14 and a road base layer 15.
Detailed Description
Cement concrete pavement ice melting system comprehensively utilizing geothermal electric heat is characterized in that: the system comprises a cement concrete road structure, a geothermal system and an electric heating system;
the cement concrete road structure can be divided into the following parts from top to bottom according to the basic form: the geothermal system and the electric heating system are used for transferring heat to the cement concrete pavement layer, and the cement concrete pavement layer transfers the heat to the ice and snow layer covered on the cement concrete pavement layer to melt the ice and snow layer so as to realize the function of melting ice and snow of the whole system;
the geothermal system comprises a ground source heat pump device 1, a circulating water pump 2, a first electric valve 3, a first automatic control device 4, a first temperature sensor 5 and a geothermal heat exchange tube 6; the ground source heat pump device 1 is of a pile valve type structure, consists of heat collection and storage piles and a heat collection raft at the top, and has the function of absorbing and utilizing geothermal energy of shallow soil so as to achieve the purpose of heating water flow in a geothermal heat exchange pipe; the geothermal heat exchange tubes 6 are arranged between the cement concrete road surface layer 11 and the heat insulation layer 12 in an overlapped S shape, circulating water flowing in the geothermal heat exchange tubes 6 transfers heat provided by the ground source heat pump device 1 to the cement concrete road surface layer 11, and the heat insulation layer 12 below the geothermal heat exchange tubes separates a path for transferring the heat downwards, so that the geothermal heat exchange tubes 6 can transfer heat of a large department to the cement concrete road surface layer 11, and the energy conversion rate of a geothermal system is improved; the ground source heat pump device 1 is connected with the inlet and the outlet of the heat exchange pipeline 6 through pipelines respectively to form a closed circulating loop, so that circulating water does not leak in the working process of the whole geothermal system, and the circulating water does not need to be supplemented; the circulating water pump 2 is an electrically driven mechanical device and provides power for circulating water in the geothermal heat exchange tube 6, so that the circulating water can stably flow, and geothermal energy provided by the ground source heat pump device 1 is timely and efficiently transferred to the cement concrete road surface layer 11; the first electrovalve 3 is an electric control valve controlled by the first automatic control device 4, the flow of circulating water can be controlled by opening and closing the first electrovalve 3, if emergency shutdown is required in case of emergency, the circulating water in the geothermal heat exchange pipe can stop flowing through the first electrovalve 3, and the geothermal system stops working; the first automatic control device 4 is a control part that controls the geothermal system; the first temperature sensor 5 is a temperature sensor for measuring the temperature of the circulating water, and transmits a circulating water temperature signal to the first control device 4; the first control device 4 receives the temperature signal of the first temperature sensor 5 in real time, directly controls the first electrovalve 3 through internal logic judgment, controls the flow and stop of circulating water, and realizes the on and off of the geothermal system, and simultaneously, the first control device 4 directly controls the circulating water pump 2 through internal logic judgment, controls the flow rate of the circulating water, and further controls the heat exchange rate of the geothermal system;
the electric heating system is a functional system which utilizes external electric power and provides heat energy for a cement concrete pavement layer 11 through an embedded electric heating wire 10, and comprises a second automatic control device 7, a second temperature sensor 8, a second electric valve 9 and an electric heating wire 10; the electric heating wire 10 is embedded in the cement concrete pavement layer 11, is arranged above a geothermal heat exchange pipe 6 of a geothermal system in an overlapped S shape, converts electric energy into heat energy through an external power supply, supplies heat to the cement concrete pavement layer 11, and has the arrangement density higher than that of the geothermal heat exchange pipe 6 because the outer diameter of the electric heating wire 10 is smaller than that of the heat exchange pipe 6; the second automatic control device 7, the second temperature sensor 8, the second electrovalve 9 and the electric heating wire 10 are connected to form a closed loop, the second electrovalve 9 is a circuit switch controlled by the second automatic control device 7, the on and off of the electric heating wire 10 current can be controlled through the on and off of the second electrovalve 9, the magnitude of the electric heating wire 10 current can also be controlled, and further the heating efficiency is controlled, if the system needs emergency shutdown in case of emergency, the electric heating system can stop working through the second electrovalve 9; the second automatic control device 7 is a control component for controlling the electric heating system; the second temperature sensor 8 is a sensor for measuring the surface temperature, and the temperature signal is transmitted to the second control device 7; the second control device 7 receives the temperature signal of the second temperature sensor 8 in real time, and directly controls the second electrovalve 9 through the internal logic judgment to control the on and off of the electric heating system and the heat exchange rate of the electric heating system.
2. The geothermal electric heating integrated cement concrete pavement ice melting system according to claim 1, wherein the matched construction method comprises the following steps:
1) according to the technical specification and the requirements of the construction process of the road cement concrete road root surface, a road cushion layer 14 and a road base layer 13 are sequentially paved on a road soil base layer 15, and after the pavement of the road base layer 13 is finished, a heat insulation material is paved on the road base layer to form a heat insulation layer 12;
2) placing a latticed steel wire mesh on the surface of the heat insulation layer 12, wherein the size of the latticed steel wire mesh is determined according to actual requirements, binding and fixing the geothermal heat exchange tubes 6 on the steel wire mesh to enable the geothermal heat exchange tubes 6 to be arranged in an overlapped S-shaped plane, and determining the arrangement density and the tube spacing of the geothermal heat exchange tubes 6 according to the actual requirements;
3) continuously pouring cement concrete with a certain thickness, after the maintenance is finished, carving an overlapped S-shaped groove on the surface of the cement concrete, arranging electric heating wires 10 in the groove, and determining the arrangement density and the wire spacing of the electric heating wires 10 according to actual requirements;
4) and continuously pouring cement concrete with a certain thickness to enable the cement concrete pavement layer 11 to reach the designed elevation, finishing the final maintenance of the pavement structure and finishing the whole cement concrete pavement structure provided with the comprehensive geothermal electric heating ice melting system.
5) A ground source heat pump device 1, a circulating water pump 2, a first electric valve 3, a first automatic control device 4 and a first temperature sensor 5 are arranged outside the road structure, connected with a geothermal heat exchange tube 6 to form a closed loop, and injected with circulating water, a second automatic control device 7, a second temperature sensor 8 and a second electric valve 9 are arranged outside the road structure, and connected with an electric heating wire 10 to form a closed loop;
6) and the debugging and acceptance of the whole geothermal electric heating comprehensive utilization cement concrete pavement ice melting system are completed.
The technical scheme of the system for melting ice on a cement concrete pavement by comprehensively utilizing geothermal electric heat and the construction method provided by the invention is further explained by combining the specific embodiment and the attached drawings. The advantages and features of the present invention will become more apparent in conjunction with the following description.
Example 1:
the method comprises the following specific steps:
1) according to the technical specification and the requirements of the construction process of the road cement concrete road root surface, a road cushion layer 14 with the thickness of 20cm and a road base layer 13 with the thickness of 15cm are sequentially paved on a road soil base layer 15, and after the pavement of the road base layer 13 is finished, a heat insulation material is paved on the road base layer to form a heat insulation layer 12 with the thickness of 5 cm;
2) placing a latticed steel wire mesh on the surface of the heat insulation layer 12, wherein the size of the latticed steel wire mesh is 10cm multiplied by 10cm, binding and fixing the geothermal heat exchange tubes 6 on the steel wire mesh, so that the geothermal heat exchange tubes 6 are arranged in an overlapped S-shaped plane, and the tube spacing of the geothermal heat exchange tubes 6 is 20 cm;
3) continuously pouring cement concrete with the thickness of 5cm, after the maintenance is finished, carving an overlapped S-shaped groove on the surface of the cement concrete, arranging electric heating wires 10 in the groove, wherein the distance between the electric heating wires 10 is 10 cm;
4) and continuously pouring cement concrete with the thickness of 5cm to enable the cement concrete pavement layer 11 to reach the designed elevation, finishing the final maintenance of the pavement structure and finishing the whole cement concrete pavement structure provided with the comprehensive geothermal electric heating ice melting system.
5) A ground source heat pump device 1, a circulating water pump 2, a first electric valve 3, a first automatic control device 4 and a first temperature sensor 5 are arranged outside the road structure, the ground source heat pump device, the circulating water pump, the first electric valve 3, the first automatic control device and the first temperature sensor 5 are connected with a geothermal heat exchange tube 6 to form a closed loop, enough circulating water with the salt content of 5% is injected, a second automatic control device 7, a second temperature sensor 8 and a second electric valve 9 are arranged outside the road structure, and an electric heating wire 10 is connected to form a closed loop;
6) and the debugging and acceptance of the whole geothermal electric heating comprehensive utilization cement concrete pavement ice melting system are completed.
In addition, the invention also needs to provide a calculation method of the heating efficiency control index, which takes the pavement area as 1m2For example, the following steps are carried out:
1. calculating the heat required by the temperature rise of the road surface
The heat Q required for raising the temperature of the surface of the cement concrete road from-5 ℃ to 0 ℃ is expressed by a formula (I)
Q＝C1M1ΔT 1 ①
C1-represents the specific heat capacity of the cement concrete, in units: j/(kg. degree. C.)
M1-represents the mass of the cement concrete in units: kg of
ΔT1-represents the temperature difference of the cement concrete road surface, in units: c
From the reference data: c1＝840J/(kg·℃)，M12350-2450 kg (material dependent, cement is selected as C30), 0- (-5) 5 deg.C
Calculating by (I): area of 1m2The temperature of the cement concrete road rises from-5 ℃ to 0 ℃, and the required heat Q is 9.87 multiplied by 106J～1.03×107J
2. Calculating the heat conduction rate of the heating wire
The heat transfer rate Q required for the temperature of the cement concrete road to rise from-5 ℃ to 0 DEG C1Is the heat transmitted by the carbon fiber heating wire after being electrified, and the temperature required by the heating wire is assumed to be T1From knowledge about heat conduction, from the temperature T of the heating wire1The temperature of the cement concrete surface which is vertically upward and reaches 0 ℃ meets the formula 2
Q1-represents the rate of heat transfer, in units: w
A-represents the surface area of the cement concrete, in units: m is2
K-represents the thermal conductivity of the cement concrete, in units: W/(m.C.)
T1-temperature of the carbon fiber heating wire, unit: c
T2To show the rise of temperature of cement concreteThe latter temperature is 0 DEG C
L-represents the embedding depth of the carbon fiber heating wire, and meets the structural requirement, unit: m is
From the reference data: a is 1m2，k＝1.28W/(m·℃)，T2＝0℃，L＝0.05m
Calculated by (2): from a surface area of 1m2The heating wire required by the cement concrete road is 5m (see figure 4), and the temperature T of the carbon fiber heating wire of 5m is required for raising the temperature of the cement concrete from-5 ℃ to 0 DEG C1107 ℃, the average temperature to 21 ℃ per 1m of carbon fiber heating wire.
3. Calculating the power of the heating wire
The electric energy P required by the heating temperature of each 1m carbon fiber heating wire reaching 21 ℃ is calculated by a formula
P-represents the power of the carbon fiber heating wire, unit: w
Q2-represents the electrical energy per 1m heating wire, in units: j. the design is a square
T0-represents the heat generation time of the heat generation line, in units: s
N-represents an area of 1m2The length of the heating line embedded in the road. Unit: m is
The electric power of the electric heating wire 10 is calculated by the formula (c) to (d) to be 548W.
It should be noted that the drawings of the present invention are in a very simplified form and are not to be taken in a precise scale, which is merely for convenience and clarity in describing the embodiments of the present invention and is not intended to limit the scope of the present invention.
It should be noted that the embodiments of the present invention have better practicability, and are not limited in any way. Any changes or modifications made by those skilled in the art based on the above disclosure should be considered as equivalent effective embodiments, and all fall within the protection scope of the technical solution of the present invention.
Claims (1)
1. Cement concrete pavement ice melting system comprehensively utilizing geothermal electric heat is characterized in that: the system comprises a cement concrete road structure, a geothermal system and an electric heating system;
the cement concrete road structure can be divided into the following parts from top to bottom according to the basic form: the geothermal system and the electric heating system are used for transferring heat to the cement concrete pavement layer, and the cement concrete pavement layer transfers the heat to the ice and snow layer covered on the cement concrete pavement layer to melt the ice and snow layer so as to realize the function of melting ice and snow of the whole system;
the geothermal system comprises a ground source heat pump device (1), a circulating water pump (2), a first electric valve (3), a first automatic control device (4), a first temperature sensor (5) and a geothermal heat exchange tube (6); the ground source heat pump device (1) is of a pile valve type structure, consists of heat collection and storage piles and a heat collection raft at the top, and has the functions of absorbing and utilizing geothermal energy of shallow soil so as to heat water flow in a geothermal heat exchange pipe; the geothermal heat exchange tubes (6) are arranged between a cement concrete road surface layer (11) and a heat insulation layer (12) in an overlapped S shape, circulating water flowing in the geothermal heat exchange tubes (6) transfers heat provided by the ground source heat pump device (1) to the cement concrete road surface layer (11), and the heat insulation layer (12) below the geothermal heat exchange tubes blocks a path for transferring the heat downwards, so that the geothermal heat exchange tubes (6) can transfer heat of a large department to the cement concrete road surface layer (11) to improve the energy conversion rate of a geothermal system; the ground source heat pump device (1) is connected with the inlet and the outlet of the heat exchange pipeline (6) through pipelines respectively to form a closed circulating loop, so that circulating water does not leak in the working process of the whole geothermal system, and the circulating water does not need to be supplemented; the circulating water pump (2) is an electrically driven mechanical device and provides power for circulating water in the geothermal heat exchange tube (6), so that the circulating water can stably flow and timely and efficiently transfer geothermal energy provided by the ground source heat pump device (1) to the cement concrete road surface layer (11); the first electrovalve (3) is an electric control valve controlled by the first automatic control device (4), the flow of circulating water can be controlled by opening and closing the first electrovalve (3), if emergency shutdown is required in case of emergency, the circulating water in the geothermal heat exchange pipe can stop flowing through the first electrovalve (3), and the geothermal system stops working; the first automatic control device (4) is a control component for controlling the geothermal system; the first temperature sensor (5) is a temperature sensor for measuring the temperature of the circulating water and transmits a circulating water temperature signal to the first control device (4); the first control device (4) receives a temperature signal of the first temperature sensor (5) in real time, directly controls the first electrovalve (3) through internal logic judgment, controls the flow and stop of circulating water, and realizes the on and off of the geothermal system, and meanwhile, the first control device (4) directly controls the circulating water pump (2) through internal logic judgment, controls the flow rate of the circulating water, and further controls the heat exchange rate of the geothermal system;
the electric heating system is a functional system which utilizes external electric power and provides heat energy for a cement concrete pavement layer (11) through an embedded electric heating wire (10), and comprises a second automatic control device (7), a second temperature sensor (8), a second electrovalve (9) and the electric heating wire (10); the electric heating wire (10) is embedded in the cement concrete pavement layer (11) and arranged above a geothermal heat exchange pipe (6) of a geothermal system in an overlapped S shape, electric energy is converted into heat energy through an external power supply, and the heat energy is supplied to the cement concrete pavement layer (11), and the arrangement density of the electric heating wire (10) is higher than that of the geothermal heat exchange pipe (6) because the outer diameter of the electric heating wire is smaller than that of the geothermal heat exchange pipe (6); the second automatic control device (7), the second temperature sensor (8), the second electrovalve (9) and the electric heating wire (10) are connected to form a closed loop, the second electrovalve (9) is a circuit switch controlled by the second automatic control device (7), the on and off of the current of the electric heating wire (10) can be controlled through the on and off of the second electrovalve (9), the magnitude of the current of the electric heating wire (10) can also be controlled, the heating efficiency is further controlled, and if the system needs emergency shutdown in case of emergency, the electric heating system can stop working through the second electrovalve (9); the second automatic control device (7) is a control component for controlling the electric heating system; the second temperature sensor (8) is a sensor for measuring the surface temperature, and a temperature signal is transmitted to the second control device (7); the second control device (7) receives the temperature signal of the second temperature sensor (8) in real time, and directly controls the second electrovalve (9) through internal logic judgment to control the on and off of the electric heating system and the heat exchange rate of the electric heating system;
the matched construction method of the cement concrete pavement ice melting system comprehensively utilizing geothermal electric heat comprises the following steps:
1) according to the technical specification and the requirements of the construction process of the road cement concrete road root surface, a road cushion layer (14) and a road base layer (13) are sequentially paved on a road soil base layer (15), and after the pavement of the road base layer (13) is finished, a heat insulation material is paved on the road base layer to form a heat insulation layer (12);
2) a latticed steel wire mesh is placed on the surface of the heat insulation layer (12), the size of the latticed steel wire mesh is determined according to actual requirements, the geothermal heat exchange tubes (6) are bound and fixed on the steel wire mesh, the geothermal heat exchange tubes (6) are arranged in an overlapped S-shaped plane, and the arrangement density and the tube spacing of the geothermal heat exchange tubes (6) are determined according to the actual requirements;
3) continuously pouring cement concrete with a certain thickness, after the maintenance is finished, carving an overlapped S-shaped groove on the surface of the cement concrete, arranging electric heating wires (10) in the groove, and determining the arrangement density and the wire spacing of the electric heating wires (10) according to actual requirements;
4) continuously pouring cement concrete with a certain thickness to enable the cement concrete pavement layer (11) to reach the designed elevation, finishing the final maintenance of the pavement structure and finishing the whole cement concrete pavement structure provided with the comprehensive geothermal electric heating ice melting system;
5) a ground source heat pump device (1), a circulating water pump (2), a first electric valve (3), a first automatic control device (4) and a first temperature sensor (5) are arranged outside the road structure, are connected with a geothermal heat exchange tube (6) to form a closed loop and inject circulating water; a second automatic control device (7), a second temperature sensor (8) and a second electrovalve (9) are arranged outside the road structure and connected with an electric heating wire (10) to form a closed loop;
6) and the debugging and acceptance of the whole geothermal electric heating comprehensive utilization cement concrete pavement ice melting system are completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN109738312B (en) * | 2019-01-21 | 2021-07-23 | 湖北工业大学 | Road ice melting model test device and method for simulating traffic load |
| CN110055856A (en) * | 2019-04-03 | 2019-07-26 | 湖北工业大学 | Seif-citing rate road surface and heating cable mixing road surface ice melting system and its construction method |
| CN110965424A (en) * | 2020-01-02 | 2020-04-07 | 长安大学 | Active snow-melting and ice-thawing road surface structure and paving process thereof |
| CN113174805B (en) * | 2020-05-22 | 2023-04-18 | 中国科学院青海盐湖研究所 | Road snow melting device of coupling energy system and use method thereof |
| CN113668320A (en) * | 2021-09-02 | 2021-11-19 | 内江师范学院 | Geothermal energy collection road surface |
| CN113914169A (en) * | 2021-11-29 | 2022-01-11 | 天津大学 | Heatable pavement structure |
| CN114657839B (en) * | 2022-05-07 | 2023-03-31 | 浙江华东工程建设管理有限公司 | Easily maintain road surface based on geothermol power water conservancy diversion |
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| CN104060515A (en) * | 2014-06-30 | 2014-09-24 | 中国民航机场建设集团公司 | Heating system for airport bituminous concrete runway |
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