CN107975953A - Wing heat exchange structure and stepped utilization method in one kind extraction dry-hot-rock geothermal energy - Google Patents
Wing heat exchange structure and stepped utilization method in one kind extraction dry-hot-rock geothermal energy Download PDFInfo
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- CN107975953A CN107975953A CN201711249192.XA CN201711249192A CN107975953A CN 107975953 A CN107975953 A CN 107975953A CN 201711249192 A CN201711249192 A CN 201711249192A CN 107975953 A CN107975953 A CN 107975953A
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
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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
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Wing heat exchange structure and stepped utilization method in one kind extraction dry-hot-rock geothermal energy, belong to hot dry rock earth energy field, geothermal energy recovery rate is low, underground heat exchange fluid is easy to run off, destroys unknown disaster caused by geologic structure in solution hot dry rock, the interior wing heat exchange structure includes hot dry rock heat-exchange system, monitoring system, geothermal energy gradient utilization system, improves the extraction efficiency to containing the geothermal energy in xeothermic rock stratum in hot dry rock heat-exchange system by finned tube in heat conduction excellent clad and enhanced heat exchange；Designed using coaxial enclosed construction, it is environment friendly and pollution-free；Monitoring system controls to adjust extraction temperature, flow and returns liquid temperature degree, flow and convenient solution organic working medium leakage problem in time；Geothermal energy supplies steam turbine power generation in organic working medium extraction hot dry rock in geothermal energy gradient utilization system, and realizes the cascade utilization of geothermal energy using organic working medium middle-low grade energy heats heating water after power generation to meet the needs of heating user.
Description
Technical field
The present invention relates to hot dry rock earth energy field, and in particular to wing heat exchange structure in one kind extraction dry-hot-rock geothermal energy
And stepped utilization method.
Background technology
Hot dry rock refer to stratum depths (buried more than 2000m) generally existing without water or steam, fine and close impermeable
Hot rock mass, mainly various metamorphic rocks or Crystalline rock masses, occurrence status have steam type, hot-water type, die mould, the ground of Magmatic
Thermal resource, reusable edible, energy conservation and environmental protection, rich reserves can meet mankind's long-time service needs.
The pattern of exploitation hot dry rock resource mainly has three kinds at present：Man-made fracture, intrinsic fracture, intrinsic fracture-tomography, three
All be in person's principle from earth's surface toward hot dry rock in beat injection well at a glance, close relatively low to well mesohigh implantation temperature after wellhole
Water, generates very high pressure.These high pressure waters can make the direction of the substantially vertical minimum crustal stress of rock mass produce many cracks,
If natively there is a small amount of natural joint in rock mass, these high pressure waters can directly expand the crack for bigger, finally by hot dry rock
In crack as heat source extract underground heat thermal energy.But deep geology structure, future can be changed by the way of crack extract underground heat
Uncertain disaster may occur, and water injection pipe causes to take up a large area with tube spacing too big (200m~600m) of drawing water,
The characteristics such as the problem of occupation of land utilization rate is low, but final or hot dry rock permeability are low, porosity is low cause the rate of geothermal utilization low, ground
Lower heat exchanging fluid turnover rate is high.
The content of the invention
Low in order to solve dry-hot-rock geothermal extraction efficiency, underground heat exchange fluid loss rate is high and causes underground pollution, geology
The technical barriers such as change, the present invention provide wing heat exchange structure and stepped utilization method in a kind of extraction dry-hot-rock geothermal energy.
The present invention is achieved by the following technical programs.
Wing heat exchange structure in one kind extraction dry-hot-rock geothermal energy, including hot dry rock heat-exchange system 1, monitoring system 2 and underground heat
Can gradient utilization system 3；The hot dry rock heat-exchange system 1 includes geothermal well 11, the heat exchanger tube 13 being placed in geothermal well 11 and changes
Liquid back pipe 14 in heat pipe 13, is socketed in the well cementing casing pipe 12 that geothermal well 11 is outer and is located in scall, positioned at well cementing casing pipe
Between 12 and geothermal well 11 and the insulation pack coating 15 in horizon d is extended to, is socketed in outside geothermal well 11 and in xeothermic rock stratum
Heat conduction clad 16, be arranged on the outlet(discharge) flange 19 of 13 top exit of heat exchanger tube and be arranged on the import of 14 entrance of liquid back pipe
Flange 18；The heat exchanger tube 13 designs for split structure, including the non-heat exchanging segment light pipe in scall and horizon d
131 and finned tube 132 and it is arranged on the back cover disk 133 of 13 bottom of heat exchanger tube in the heat exchanging segment in xeothermic rock stratum；
The monitoring system 2 includes being arranged on the pumping control valve 21 and booster pump 22 of the outlet of geothermal well 11, is arranged on and changes
The data collecting system being made of liquid level sensor 26, temperature sensor 27 and flowmeter 28 in heat pipe 13, is arranged on back liquid
Display control module 23, return hydraulic control valve 24 and time liquid pump 25 of 14 entrance of pipe；
The geothermal energy gradient utilization system 3 includes the gas-liquid separation device 31 being connected with booster pump 22, with gas-liquid separation
The steam turbine 32 of the high temperature organic gas outlet connection of device 31, steam turbine 32 drive generator 33 to send out using organic Rankine bottoming cycle
Electricity, the gas outlet of steam turbine 32 and organic liquor outlet connection 34 entrance of heat exchanger of gas-liquid separation device 31, steam turbine 32 export
The heating water that the organic liquor that gas is isolated with gas-liquid separator 31 together enters in heat exchanger 34 with the user 35 that heats exchanges heat, heat exchange
The outlet of device 34 connection 36 entrance of condensing tower, condensing tower 36 connect back to liquid pump 25.
Back cover disk 133 is set in the heat exchanging segment at 132 bottom preset distance of finned tube, which ensures 180 ° of working medium downlink
Turning do not formed vortex and even into fluid interchange between fin.
Finned tube 132 is manufactured using monolithic molding mode in the heat exchanging segment, i.e., using solid forging, monolithic extruded and overall
Machine add-on type；Or shaped using wire cutting, the gap when molybdenum filament of wire cutting enters and exits wants soldering and sealing to become closed circular
Pipe；Or using being welded, welding structure be by two solid forgings are monolithic extruded or mach semicircle in finned tube docking
Welding twice longitudinal joint forms.
132 surface of finned tube is smooth surface in the heat exchanging segment, or does longitudinal ripple processing, corrugated form for enhancing exchange capability of heat
For zigzag, rectangle or SIN function waveform.
When finned tube 132 is using axial symmetry comb teeth-shaped structure in the heat exchanging segment, the quantity of inner fin pair is 3~8 pairs, thickness
For 2~4mm, suitable inner fin parameter is selected according to pipe diameter size, Working fluid flow situation in specific make.
Finned tube 132 and back cover disk 133 are alusil alloy, copper or Copper alloy material in the heat exchanging segment, non-heat exchanging segment light pipe
131 head uses heat safe fluoroplastics material using the low metal material of thermal conductivity factor, liquid back pipe 14.
The heat conduction clad 16 is using the material cast that fusing point is lower than finned tube in heat exchanging segment 132, heat conduction is excellent and nontoxic
Form；The insulation pack coating 15 is poured using the fusing point heat-insulated and nontoxic material lower than non-heat exchanging segment light pipe 131 and formed, and is risen
To insulation effect.
Coating parcel heat preserving and insulating material is prevented on the liquid level sensor 26, temperature sensor 27, flowmeter 28 and circuit
The instrument circuit being only on active service in hot environment is destroyed.
The geothermal energy stepped utilization method of wing heat exchange structure, includes the following steps in the extraction dry-hot-rock geothermal energy：
A, hot dry rock exploration and drilling well：
The depth and underground heat energy storage capacity of the xeothermic rock stratum of underground deep layer are detected using geothermal measurement equipment, choose underground heat
, to selected areas drilling well, put down using oil-well drilling equipment to firm rock stratum and after being drilled into predetermined depth in the big region of energy storage capacity
Well cementing casing pipe 12, and insert cement 17 on the outside and cement the well, use deep 4000 meters~5000m is drilled under small size drill bit afterwards
At xeothermic rock stratum, using circulating detergent remover cleaning down geothermal well 11；
B, the coaxial preparation of closed heat exchanger tube and the encapsulation of data collecting system：
Finned tube 132 in heat exchanging segment, envelope are prepared according to the diameter of the diameter of the depth of xeothermic rock stratum, geothermal well 11 selection adaptation
Chassis 133 and non-heat exchanging segment light pipe 131 and its head, liquid back pipe 14 is prepared according to the quantity of heat storage design diameter of xeothermic rock stratum, will
Liquid level sensor 26 is encapsulated in the relevant position of liquid back pipe 14 and the good circuit of cloth；Further by finned tube in heat exchanging segment 132 and back cover
The preparation of heat exchange pipeline section is completed in the welding of 133 back cover of disk；By packaged temperature sensor 27 and the non-heat exchanging segment light pipe of flowmeter 28
131st, light pipe head, finned tube 132, liquid back pipe 14 assemble in heat exchanging segment, light pipe head and non-heat exchanging segment light pipe 131 are welded finally
Light pipe 131 and 14 junction of liquid back pipe are sealed；
C, prepared by clad：
The heat exchanger tube that upper step is assembled is placed in well, and after fixing, passes through gap between heat exchanger tube and well cementing casing pipe 12
By fusing point is lower than finned tube in heat exchanging segment 132, heat conduction is excellent and nontoxic mould material melt after be pressed into xeothermic rock stratum heat exchanging segment, pour
Note process in which materials and xeothermic rock stratum realize that diffusion and melting are beneficial to heat transfer, it is ensured that pour hot dry rock after material solidification shaping
Layer thermal energy continuously passes to finned tube 132 in heat exchanging segment；Further by heat-insulated lower than non-heat exchanging segment light pipe 131 of fusing point and
It is nontoxic pour material melts after poured into from ground to non-heat exchanging segment, form insulation pack coating 15, play insulation effect；
D, temperature, flow, Liquid level：
The data of collection are passed through with flowmeter 28 by the temperature sensor 27 installed in non-131 head of heat exchanging segment light pipe
After data transfer to display control module 23, operating personnel show and generate electricity according to temperature, data on flows, the need for the user 35 that heats
Ask, by control pumping control valve 21 and booster pump 22, return hydraulic control valve 24 and return liquid pump 25 with bleeding regulating, return flow quantity and
Temperature, liquid level sensor 26 feeds back liquid level data in heat exchanger tube, convenient to solve organic working medium leakage problem in time；
E, can cascade utilization：
Geothermal energy gradient utilization system 3 is circulated using double-work medium, organic working medium finned tube 132 in the heat exchanging segment of xeothermic rock stratum
Middle extraction ground energy, is extracted out the height be sent into gas-liquid separator 31, isolated by booster pump 22 after gasification through non-heat exchanging segment light pipe 131
Warm organic gas enters steam turbine 32, drives generator 33 to generate electricity using organic Rankine bottoming cycle, steam turbine 32 is worked off one's feeling vent one's spleen and gas-liquid
The organic liquor that separator 31 is isolated together enters in heat exchanger 34 to exchange heat with heating water, and the last condensed tower 36 of organic working medium is cold
Liquid is returned to geothermal well bottom by returning liquid pump 25 after solidifying, is recycled, the heating water containing low grade heat energy is then supplied to heating user 35
It is warm, realize the cascade utilization of geothermal energy.
The present invention has the advantages that compared with prior art：
(1) present invention is circulated using double-work medium, by the cascade utilization of energy, improve ground can utilization rate；
(2) present invention employs split type coaxial closed heat exchanger tube, the extraction efficiency of thermal energy in xeothermic rock stratum is strengthened
And scattering and disappearing for non-heat exchanging segment heat is reduced, while to can effectively improve traditional heat exchange element center lazy for the inner finned tube structure that illustrates of case
Property heat transfer zone, realize that cross-section temperature field uniformly maximizes, improving can extraction efficiency in hot dry rock；
(3) present invention employs the excellent material cast with heat-insulated nonhazardous of heat conduction to prepare heat exchanger tube clad, exchanges heat
The excellent clad of section place's heat conduction can improve the extraction efficiency of the energy of finned tube section in heat exchanging segment, non-heat exchanging segment light pipe in hot dry rock
Insulation pack coating at section plays the effect of insulation, prevents high temperature organic working medium gas from radiating to outside well；
(4) present invention employs coaxial closed heat exchanger tube, cycle fluid not to contact with environment, will not influence each other, ring
Protect pollution-free；
(5) present invention employs monitoring system, can according to power generation, the demand of heating user, bleeding regulating, return flow quantity and
Temperature can simultaneously solve organic working medium leakage problem in time.
Brief description of the drawings
Fig. 1 is overall structure diagram of the present invention.
Fig. 2 is underground heat heat-exchange system schematic diagram.
Fig. 3 is previous to wing semi-circular tube top view in axial symmetry comb teeth-shaped to weld.
Fig. 4 is wing semi-circular tube stereogram in axial symmetry comb teeth-shaped.
Fig. 5 is finned tube top view in integrally formed axial symmetry comb teeth-shaped.
Fig. 6 is finned tube partial cross-sectional perspective view in axial symmetry comb teeth-shaped.
Fig. 7 is radial direction inner panel finned tube top view.
Fig. 8 is radial direction inner panel finned tube partial cross-sectional perspective view.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
As depicted in figs. 1 and 2, wing heat exchange structure in a kind of extraction dry-hot-rock geothermal energy of the present invention, including hot dry rock heat exchange
System 1, monitoring system 2 and geothermal energy gradient utilization system 3；The hot dry rock heat-exchange system 1 includes geothermal well 11, is placed in underground heat
The liquid back pipe 14 in heat exchanger tube 13 and heat exchanger tube 13 in well 11, is socketed in the well cementation that geothermal well 11 is outer and is located in scall
Casing 12, between well cementing casing pipe 12 and geothermal well 11 and extends to the insulation pack coating 15 in horizon d, is socketed in geothermal well
11 heat conduction clads 16 outer and in xeothermic rock stratum, are arranged on the outlet(discharge) flange 19 of 13 top exit of heat exchanger tube and set
In the suction flange 18 of 14 entrance of liquid back pipe；The heat exchanger tube 13 designs for split structure, including positioned at scall and base
Non- heat exchanging segment light pipe 131 in rock stratum and finned tube 132 and it is arranged on 13 bottom of heat exchanger tube in the heat exchanging segment in xeothermic rock stratum
The back cover disk 133 in portion；
The monitoring system 2 includes being arranged on the pumping control valve 21 and booster pump 22 of the outlet of geothermal well 11, is arranged on and changes
The data collecting system being made of liquid level sensor 26, temperature sensor 27 and flowmeter 28 in heat pipe 13, is arranged on back liquid
Display control module 23, return hydraulic control valve 24 and time liquid pump 25 of 14 entrance of pipe；
The geothermal energy gradient utilization system 3 includes the gas-liquid separation device 31 being connected with booster pump 22, with gas-liquid separation
The steam turbine 32 of the high temperature organic gas outlet connection of device 31, steam turbine 32 drive generator 33 to send out using organic Rankine bottoming cycle
Electricity, the gas outlet of steam turbine 32 and organic liquor outlet connection 34 entrance of heat exchanger of gas-liquid separation device 31, steam turbine 32 export
The heating water that the organic liquor that gas is isolated with gas-liquid separator 31 together enters in heat exchanger 34 with the user 35 that heats exchanges heat, heat exchange
The outlet of device 34 connection 36 entrance of condensing tower, condensing tower 36 connect back to liquid pump 25.
In the hot dry rock heat-exchange system 1：
Well cementing casing pipe 12 and utilization cement 17 are relatively small coaxial by diameter after cementing the well down in the loose stratum of geology
Closed heat exchanger tube is integrally gone into the well, after being pressed into thawing successively according to the depth of the height of finned tube in heat exchanging segment 132 and xeothermic rock stratum
The excellent material of heat conduction and pour into heat-barrier material, corresponding heat conduction clad 16 and insulation pack coating 15 are formed after cooling；Institute
State in heat exchanging segment that fin has the function that correcting at the same time in finned tube 132, it is ensured that liquid back pipe 14 is overall parallel with heat exchanger tube 13；Institute
The height for stating finned tube 132 in heat exchanging segment is determined by the depth of xeothermic rock stratum after geological prospecting and drilling well；The heat conduction clad 16
Formed using the excellent and nontoxic material cast of the fusing point heat conduction lower than finned tube in heat exchanging segment 132, material and dry in casting process
Hot rock stratum realizes that excellent diffusion and melting are beneficial to heat transfer, after it is solidified, it is ensured that thermal energy is continuously in xeothermic rock stratum
Pass to finned tube 132 in heat exchanging segment；The insulation pack coating 15 is using heat-insulated and nontoxic lower than non-heat exchanging segment light pipe 131 of fusing point
All material pour and form, play insulation effect.
In the monitoring system 2：
Monitoring system 2 gathers coaxial closed heat exchanger tube by liquid level sensor 26, temperature sensor 27 and flowmeter 28
Temperature of Working, data on flows after interior liquid level and heat exchange, data collecting system are arranged in hot dry rock heat-exchange system 1, are passed in liquid level
Sensor 26, temperature sensor 27 and coating parcel heat preserving and insulating material on flowmeter 28 and circuit prevent from being on active service in hot environment
Instrument circuit be destroyed；The display control module 23 is Data Acquisition System Terminal, and operating personnel are according to temperature, flow number
According to display and generate electricity, the demand of heating user, by controlling pumping control valve 21 and booster pump 22, return hydraulic control valve 24 and time liquid
Pump 25 is with bleeding regulating, time flow quantity and temperature；The liquid level sensor 26 feeds back liquid level data in heat exchanger tube, convenient solution in time
Certainly organic working medium leakage problem；
In the geothermal energy gradient utilization system 3：
Geothermal energy gradient utilization system 3 using double-work medium circulate, can extract hot dry rock, gas-liquid separation, gas-turbine generate electricity,
It is condensed back to liquid and organic Rankine bottoming cycle is carried out using organic working medium such as pentane etc., since the heating equipment for the user 35 that heats often occurs
Working medium phenomenon is revealed, is circulated from safety considerations using water, the heating water after organic working medium heat exchange in heat exchanger 34, flow direction
User heat for its demand.
Wing heat exchange structure and stepped utilization method in one kind extraction dry-hot-rock geothermal energy, carry out successively according to the following steps：
A, hot dry rock exploration and drilling well：
The depth and underground heat energy storage capacity of the xeothermic rock stratum of underground deep layer are detected using advanced geothermal measurement equipment, selected
The region of geothermal energy large storage capacity is taken to use oil-well drilling equipment to firm rock stratum and to be drilled into enough depth to selected areas drilling well
After put down well cementing casing pipe 12, and insert cement 17 on the outside and cement the well, it is 4000 meters deep using being drilled under small size suitable drill bit afterwards
At the xeothermic rock stratum of~5000m, using circulating detergent remover cleaning down geothermal well 11；
B, the coaxial preparation of closed heat exchanger tube and the encapsulation of data collecting system：
Suitable diameter is selected to prepare finned tube 132 in heat exchanging segment, envelope according to the diameter of the depth of xeothermic rock stratum, geothermal well 11
Chassis 133 and non-heat exchanging segment light pipe 131 and its head, further interior finned tube 132 is by solid forging, monolithic extruded, overall
Machine addition shape or wire cutting shaping form, and can also be welded by finned tube in two semicircles as shown in Figure 3；According to hot dry rock
The quantity of heat storage design diameter of layer prepares liquid back pipe 14, and liquid level sensor 26 is encapsulated in relevant position and the good line of cloth of liquid back pipe 14
Road；Finned tube in heat exchanging segment 132 and the welding of 133 back cover of back cover disk are further completed to the preparation of heat exchange pipeline section；By packaged temperature
The non-heat exchanging segment light pipe 131 of sensor 27 and flowmeter 28, light pipe head, finned tube 132, liquid back pipe 14 press such as Fig. 1 in heat exchanging segment
Shown assembling, light pipe head and non-heat exchanging segment light pipe 131 are welded and finally seal light pipe 131 and 14 junction of liquid back pipe；
C, prepared by clad：
The heat exchanger tube that upper step is assembled is placed in well, after handling with care and fixing, passes through heat exchanger tube and well cementing casing pipe
12 gaps are pressed into xeothermic rock stratum after the excellent and nontoxic mould material of the fusing point heat conduction lower than finned tube in heat exchanging segment 132 is melted
Heat exchanging segment, material and xeothermic rock stratum realize that excellent diffusion and melting are beneficial to heat transfer in casting process, it is ensured that pour material
Hot dry rock thermosphere can continuously pass to finned tube 132 in heat exchanging segment after coagulation forming；Further by fusing point than non-heat exchanging segment
Low heat-insulated and nontoxic of light pipe 131 is poured into non-heat exchanging segment after pouring material melts from ground, is formed insulation pack coating 15, is risen
To insulation effect；
D, temperature, flow, Liquid level：
The data of collection are passed through with flowmeter 28 by the temperature sensor 27 installed in non-131 head of heat exchanging segment light pipe
After data transfer to display control module 23, operating personnel show and generate electricity according to temperature, data on flows, the need for the user 35 that heats
Ask, by control pumping control valve 21 and booster pump 22, return hydraulic control valve 24 and return liquid pump 25 with bleeding regulating, return flow quantity and
Temperature, liquid level sensor 26 feeds back liquid level data in heat exchanger tube, convenient to solve organic working medium leakage problem in time；
E, can cascade utilization：
Geothermal energy gradient utilization system 3 is circulated using double-work medium, the heat exchanging segment in xeothermic rock stratum such as organic working medium such as pentane
Extraction ground energy in interior finned tube 132, is extracted out by booster pump 22 through non-heat exchanging segment light pipe 131 after gasification and is sent into gas-liquid separator 31,
The high temperature organic gas isolated enters gas-turbine 32, drives generator 33 to generate electricity using organic Rankine bottoming cycle, gas-turbine 32 goes out
The organic liquor that implication is isolated with gas-liquid separator 31 together enters in heat exchanger 34 to exchange heat with heating water, last organic working medium warp
Condensing tower 36 returns liquid to geothermal well bottom, recycling, the heating water containing low grade heat energy by time liquid pump 25 after condensing and then gives and supply
Warm user 35 heats, and realizes the cascade utilization of geothermal energy.
It is described in more detail with reference to the internal fin tube structure of attached drawing：
Case study on implementation one
Fig. 3 is previous to wing semi-circular tube top view in axial symmetry comb teeth-shaped to weld.
Fig. 4 is wing semi-circular tube stereogram in axial symmetry comb teeth-shaped.
Fig. 5 is finned tube top view in integrally formed axial symmetry comb teeth-shaped.
Fig. 6 is finned tube partial cross-sectional perspective view in axial symmetry comb teeth-shaped.
Finned tube section includes finned tube 132 and back cover disk 133 in axial symmetry comb teeth-shaped heat exchanging segment in the heat exchanging segment；The heat exchanging segment
Interior finned tube 132 can be manufactured using monolithic molding mode as shown in Figure 5, i.e., using solid forging, monolithic extruded, integrated machine addition
Type；Secondly, can also wire cutting be used to shape, the gap when molybdenum filament of only wire cutting enters and exits also wants soldering and sealing could be into
To close pipe；3rd, it can use and be welded, welding structure is by two solid forgings or monolithic extruded as shown in Figure 3
Or finned tube butt welding twice longitudinal joint forms in mach semicircle；Further finned tube in most single hops is welded successively, most
Back cover disk 133 is completed finned tube section in heat exchanging segment and is manufactured in soldering and sealing afterwards；
As shown in figure 4, the axial symmetry comb teeth-shaped inner fin structure is different from the symmetrical interior wing of any radial center
Formula heat exchange element structure, from the point of view of the perturbation action to flowing, the wing type structure of any radial direction can not all realize main flow area
The homogenization in temperature field, can reduce heat transfer coefficient there are high temperature concentrated area.In single-phase heat transfer process, axial symmetry comb
Some heat exchange areas have been split in the interior wing design of dentation, are changed by effectively optimizing the temperature gradient of intraductal working medium radial direction
The heat transfer effect of centre idler heat transfer zone in kind pipe, realizes the uniform maximization of interface temperature field.
As the preferred embodiments of the invention, the logarithm of the inner fin is 3~8 pairs, being capable of root in specific make
Suitable inner fin quantity is selected according to pipe diameter size, Working fluid flow situation.
As the preferred embodiments of the invention, the thickness of the inner fin being capable of basis in specific make for 2~4mm
Pipe diameter size, Working fluid flow situation select suitable inner fin thickness.
As the preferred embodiments of the invention, the inner fin can do longitudinal ripple processing on surface, and corrugated form is
Zigzag, rectangle or SIN function waveform etc., increase the heat exchange area of inner fin and significantly enhance flow disturbance, improve
Heat-transfer effect, suitable corrugated shape can be selected in specific make according to cost of manufacture, heat exchange efficiency and Working fluid flow situation.
Case study on implementation two
Fig. 7 is radial direction inner panel finned tube top view.
Fig. 8 is radial direction inner panel finned tube partial cross-sectional perspective view.
In the present embodiment, for the structure identical with embodiment one, identical symbol is given, and omits identical say
It is bright.
The radial direction inner panel finned tube is using plate fin structure in centrosymmetric radial direction.
As the preferred embodiments of the invention, the logarithm of the inner panel wing is 2~8 pairs, being capable of root in specific make
Suitable inner panel wing quantity is selected according to required heat-transfer capability size, Working fluid flow situation in pipe.
As the preferred embodiments of the invention, the consistency of thickness of the inner panel wing and for 2~4mm in specific make energy
It is enough that suitable inner panel wing thickness is selected according to pipe diameter size, Working fluid flow situation.
Claims (10)
1. wing heat exchange structure in one kind extraction dry-hot-rock geothermal energy, it is characterised in that：Including hot dry rock heat-exchange system (1), monitoring
System (2) and geothermal energy gradient utilization system (3)；The hot dry rock heat-exchange system (1) includes geothermal well (11), is placed in geothermal well
(11) liquid back pipe (14) in heat exchanger tube (13) and heat exchanger tube (13) in, is socketed in geothermal well (11) outside and is located at scall
In well cementing casing pipe (12), between well cementing casing pipe (12) and geothermal well (11) and extend to the insulation pack coating in horizon d
(15), the heat conduction clad (16) for being socketed in geothermal well (11) outside and being located in xeothermic rock stratum, is arranged at the top of heat exchanger tube (13)
The outlet(discharge) flange (19) of outlet and the suction flange (18) for being arranged on liquid back pipe (14) entrance；The heat exchanger tube (13) is split
Formula structure design, including non-heat exchanging segment light pipe (131) in scall and horizon d and in xeothermic rock stratum
Finned tube (132) and the back cover disk (133) of heat exchanger tube (13) bottom is arranged in heat exchanging segment；
The monitoring system (2) includes being arranged on the pumping control valve (21) and booster pump (22) of geothermal well (11) outlet, sets
The data acquisition system being made of liquid level sensor (26), temperature sensor (27) and flowmeter (28) in heat exchanger tube (13)
System, is arranged on the display control module (23), return hydraulic control valve (24) and time liquid pump (25) of liquid back pipe (14) entrance；
The geothermal energy gradient utilization system (3) includes the gas-liquid separation device (31) being connected with booster pump (22), with gas-liquid point
From the steam turbine (32) of the high temperature organic gas outlet connection of device (31), steam turbine (32) drives hair using organic Rankine bottoming cycle
Motor (33) generates electricity, and the gas outlet of steam turbine (32) and the organic liquor outlet connection heat exchanger (34) of gas-liquid separation device (31) enter
Mouthful, steam turbine (32) work off one's feeling vent one's spleen the organic liquor isolated with gas-liquid separator (31) together into heat exchanger (34) with it is heating
The heating water heat exchange at family (35), heat exchanger (34) outlet connection condensing tower (36) entrance, condensing tower (36) connect back to liquid pump (25).
2. wing heat exchange structure in a kind of extraction dry-hot-rock geothermal energy according to claim 1, it is characterised in that：The heat exchange
Back cover disk (133) is set in section at finned tube (132) bottom preset distance, which ensures that working medium downlink half-turn does not form whirlpool
Stream and even into fluid interchange between fin.
3. wing heat exchange structure in a kind of extraction dry-hot-rock geothermal energy according to claim 1, it is characterised in that：The heat exchange
Finned tube (132) is manufactured using monolithic molding mode in section, i.e., using solid forging, monolithic extruded and integrated machine add-on type；Or adopt
Shaped with wire cutting, the gap when molybdenum filament of wire cutting enters and exits wants soldering and sealing to become closing pipe；Or using welding
Form, welding structure be by two solid forgings are monolithic extruded or mach semicircle in finned tube butt welding twice longitudinal joint and
Into.
4. wing heat exchange structure in a kind of extraction dry-hot-rock geothermal energy according to claim 1, it is characterised in that：The heat exchange
Finned tube (132) surface is smooth surface in section, or does longitudinal ripple processing for enhancing exchange capability of heat, and corrugated form is zigzag, rectangle
Or SIN function waveform.
5. wing heat exchange structure in a kind of extraction dry-hot-rock geothermal energy according to claim 1, it is characterised in that：The heat exchange
When finned tube (132) uses axial symmetry comb teeth-shaped structure in section, the quantity of inner fin pair is 3~8 pairs, and thickness is 2~4mm, is being had
Inner fin parameter is selected according to pipe diameter size, Working fluid flow situation when system is made.
6. wing heat exchange structure in a kind of extraction dry-hot-rock geothermal energy according to claim 1, it is characterised in that：The heat exchange
When finned tube (132) uses plate fin structure in central symmetry in section, the quantity of inner fin pair is 2~8 pairs, and thickness is 2~4mm,
Inner fin parameter is selected according to pipe diameter size, Working fluid flow situation during specific making.
7. wing heat exchange structure in a kind of extraction dry-hot-rock geothermal energy according to claim 1, it is characterised in that：The heat exchange
Finned tube (132) and back cover disk (133) are alusil alloy, copper or Copper alloy material in section, and the head of non-heat exchanging segment light pipe (131) is adopted
With the low metal material of thermal conductivity factor, liquid back pipe (14) uses heat safe fluoroplastics material.
8. wing heat exchange structure in a kind of extraction dry-hot-rock geothermal energy according to claim 1, it is characterised in that：The heat conduction
Clad (16) is using fusing point is lower than finned tube in heat exchanging segment (132), heat conduction is excellent and nontoxic material cast forms；It is described heat-insulated
Clad (15) is poured using the fusing point heat-insulated and nontoxic material lower than non-heat exchanging segment light pipe (131) and formed, and is played insulation and is made
With.
9. wing heat exchange structure in a kind of extraction dry-hot-rock geothermal energy according to claim 1, it is characterised in that：The liquid level
Coating parcel heat preserving and insulating material prevents from being on active service in height on sensor (26), temperature sensor (27), flowmeter (28) and circuit
Instrument circuit in warm environment is destroyed.
10. the geothermal energy cascade utilization side of wing heat exchange structure in claim 1 to 9 any one of them extraction dry-hot-rock geothermal energy
Method, it is characterised in that：Include the following steps：
A, hot dry rock exploration and drilling well：
The depth and underground heat energy storage capacity of the xeothermic rock stratum of underground deep layer are detected using geothermal measurement equipment, choose geothermal energy storage
Big region is measured using oil-well drilling equipment to selected areas drilling well, to firm rock stratum and is drilled into after predetermined depth and puts down well cementation
Casing (12), and cement (17) well cementation is inserted on the outside, use deep 4000 meters~5000m is drilled under small size drill bit afterwards
At xeothermic rock stratum, using circulating detergent remover cleaning down geothermal well (11)；
B, the coaxial preparation of closed heat exchanger tube and the encapsulation of data collecting system：
Finned tube in heat exchanging segment (132), envelope are prepared according to the diameter of the diameter of the depth of xeothermic rock stratum, geothermal well (11) selection adaptation
Chassis (133) and non-heat exchanging segment light pipe (131) and its head, liquid back pipe is prepared according to the quantity of heat storage design diameter of xeothermic rock stratum
(14), liquid level sensor (26) is encapsulated in relevant position and the good circuit of cloth of liquid back pipe (14)；Further by wing in heat exchanging segment
Manage the preparation that heat exchange pipeline section is completed in the welding of (132) and back cover disk (133) back cover；By packaged temperature sensor (27) and flowmeter
(28) non-heat exchanging segment light pipe (131), light pipe head, finned tube (132), liquid back pipe (14) assembling in heat exchanging segment, by light pipe head
Finally light pipe (131) and liquid back pipe (14) junction are sealed with the welding of non-heat exchanging segment light pipe (131)；
C, prepared by clad：
The heat exchanger tube that upper step is assembled is placed in well, and after fixing, passes through gap general between heat exchanger tube and well cementing casing pipe (12)
Fusing point is lower than finned tube in heat exchanging segment (132), heat conduction is excellent and nontoxic mould material melt after be pressed into xeothermic rock stratum heat exchanging segment, pour
Note process in which materials and xeothermic rock stratum realize that diffusion and melting are beneficial to heat transfer, it is ensured that pour hot dry rock after material solidification shaping
Layer thermal energy continuously passes to finned tube in heat exchanging segment (132)；Further by fusing point it is lower than non-heat exchanging segment light pipe (131) every
It is hot and nontoxic pour material melts after poured into from ground to non-heat exchanging segment, form insulation pack coating (15), play insulation effect；
D, temperature, flow, Liquid level：
The data of collection are led to flowmeter (28) by the temperature sensor (27) installed in non-heat exchanging segment light pipe (131) head
After crossing data transfer to display control module (23), operating personnel show and generate electricity according to temperature, data on flows, heat user 35
Demand, by control pumping control valve (21) with booster pump (22), return hydraulic control valve (24) and return liquid pump (25) with adjust pumping
Gas, return flow quantity and temperature, and liquid level sensor (26) feeds back liquid level data in heat exchanger tube, convenient to solve organic working medium leakage in time
Problem；
E, can cascade utilization：
Geothermal energy gradient utilization system (3) is circulated using double-work medium, organic working medium finned tube (132) in the heat exchanging segment of xeothermic rock stratum
Middle extraction ground energy, is extracted out by booster pump (22) through non-heat exchanging segment light pipe (131) after gasification and is sent into gas-liquid separator (31), separation
The high temperature organic gas gone out enters gas-turbine (32), and generator (33) power generation, gas-turbine (32) are driven using organic Rankine bottoming cycle
The organic liquor isolated with gas-liquid separator (31) of working off one's feeling vent one's spleen together enters in heat exchanger (34) to exchange heat with heating water, last organic
Liquid is returned to geothermal well bottom by returning liquid pump (25) after the condensed tower of working medium (36) condensation, is recycled, the confession containing low grade heat energy
Warm water then gives heating user (35) heating, realizes the cascade utilization of geothermal energy.
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