CN110290953A - Flexible screw shape heater - Google Patents

Abstract

A kind of heater, which, which has, is connected to the electric current line of return and around the spirality resistance heater wire of electric current line of return coiling.The heater from the heat transfer heater well for removing pollutant in soil, underground water or rock for using.

Description

Flexible screw shape heater

Background technique

Heat transfer heater well can be used for removing pollutant from soil, underground water or rock.Heat transfer heater well is Heating device is generally positioned in ground or mound so that thermal energy to be transported in contaminated medium.In most applications, make It is drilled in ground with drilling machine to install metal sleeve, it is contaminated to transfer heat to which can accommodate heating device Ambient.The existing design of electric heater well is concentrated on generates heat using tubular electric heating in metal sleeve.These add Hot device is hard and is difficult to install, especially in the case where heater is very long.Length of traditional heater design in heater Uniform heating is provided on degree, and cannot change and adjust the heating at different interval.Conventional system or bulky, It is generally necessary to which six inches or bigger of casing diameter to be so that heater to be contained in casing, and special equipment is needed to install Big casing and heater block.

Currently also use the heater being made of rigid tubing；Stainless steel is common structural material.Need crane or Lifting means raises the rigid heater constructed in advance, the metal sleeve that they is placed into vertically under datum plane In.Long Conventional heaters must manufacture at the scene, can not ship because they are too long in preparatory construction.In the project phase Between, the amount of the heat energy of the different depth interval conveying of heater can not be changed into.

Another heat transfer heating technique, which is included in ground, to be installed casing and is pushed into hot gas to add from inside pipe casing Under thermally.Hot gas is usually supplied by many natural gases or propane burner, and each burner needs expensive control system System and safety measure.This has that such as energy ecology is low, this is because heating early stage from heater It is discharged in a large amount of heat loss and the pipe-line transportation system in the hot gas in air caused by the accumulation of acidic condensate. These gas injection tube pipeline conveying systems are also unnecessarily bulky and heavy using the pipeline in pipeline.These systems The diameter of minimum outer tube diameter is usually four to six inches.As tubular electric heating, gas heater well does not have practical Method changes the thermal output at different depth.

The way in underground heating is still installation rigid tubular heater at present, which is difficult to ship and install And it cannot modify so that offer heats or cannot be during the different phase of project easily at different depth intervals It modifies.The systems bulky and the drilling of major diameter is needed to carry out supports heaters element.

Summary of the invention

A kind of flexible screw shape heater is disclosed, which there is the spirality resistance for being connected to the electric current line of return to add Hot line.Spirality resistance heater wire is coiled around the electric current line of return.By positioning one or more rightings along the electric current line of return Device maintains the density or pitch of the coil in one or more heater wire sections, to generate desired calorific intensity.Illustrative In, flexible screw shape heater be can be inserted into the casing in hole located underground, to provide heat transfer heating, so as to from soil Pollutant is removed in earth, underground water or rock.

Detailed description of the invention

When combining the attached drawing of illustrated embodiment to read, the present invention can be best understood from the following detailed description.

Fig. 1 depicts the embodiment of the flexible heater in insertion heater well casing.

Fig. 2 is the schematic diagram for the heater well of underground heating application, which, which has, surrounds the electric current line of return The resistance heater wire of coiling, wherein can adjust loop density to obtain desired heating intensity.Heater well is constituted together Flexible screw shape heater is shown in the section face of other component.

Fig. 3 depicts the centralizer of the centralizer form with recess.

Specific embodiment

The embodiment of flexible screw shape heater includes the resistance heater wire around the coiling of the electric current line of return, the heater It more easily ships and installs than Conventional heaters, and can provide the adjustability of the heating at different level.Flexible screw The embodiment of shape heater can be compressed to produce more compact product as spring, for shipping or otherwise transporting It is defeated.Flexible screw shape heater may be mounted in underground metalliferous casing, when the diameter ratio of the metal sleeve is using rigid heater Usually used diameter is much smaller in industry.In the case where the embodiment of flexible screw shape heater, it may be unnecessary to install Special installation needed for rigid tubular heater, such as crane or other lifting means.In a specific embodiment, flexible spiral shell Rotation shape heater may be mounted in as low as 25 millimeters to 50 millimeters of diameter of pipeline.Loop density or screw pitch can be modified to adjust Save the heating of different depth.As used herein, " loop density " is the coil number of every length unit, and is spiral segment Away from inverse.Compared with rigid tubular heater, after project initiation, it can be easier to realize the variation of heating at the scene.? In illustrative embodiments, flexible screw shape heater is lighter than conventional rigid heater, this may make that it is easier and more Safely install.The coil of roughly circular pattern usually will be easiest to manufacture and empty, but the coil of other shapes can also be realized Similar effect and device.

Fig. 1 depicts the embodiment of the flexible screw shape heater 100 in insertion heater well casing 102, the casing 102 generally include metal.Flexible screw shape heater 100 has spiral shape heater wire 104, which can be for example Nickel chromium triangle (NiChrome) line or other suitable resistance heater wires.In the exemplary embodiment, spiral shape heater wire 104 is soft Property higher temperature line.Although the present invention can be described for nichrome wire, the line being made of other suitable alloy or metals can be used. As used herein, " nickel chromium triangle " refers to nichrome.The nichrome comprising other metals can also be used.In general, nickel will It is the major metal in alloy, that is, accounts for the metal of largest percentage.Term " spiral shape " and " spiral " are widely used, and including It is not mathematically the coiling of spiral, includes the coiling of mathematical spiral yet.In the exemplary embodiment, spiral shape heater wire 104 Diameter can in the range of 0.025 millimeter to about 10 millimeters, the diameter can be for example size range be 000 to 50 U.S.'s line Advise the nickel chromium triangle line gauge of (AWG).In another illustrated embodiment, the diameter of spiral shape heater wire 104 is at 1 millimeter to 4 millimeters In the range of (17 to 6AWG).In general, the diameter of spiral shape heater wire 104 is chosen to obtain optimal flexibility and coil is close Degree.

When in big casing in use, illustrative spiral internal diameter can be in the range of from 5 millimeters to more than 150 millimeters. In another embodiment, spiral shape heater wire 104 will be with inside spin diameter in the range of 6 millimeters to 40 millimeters.? Spiral shape heater wire 104 within the scope of this usually will allow to be inserted into small casing, this can save time and money.From spiral shell The heat of rotation shape heater wire 104 is transferred to heater well casing 102.

The electric current line of return 106 extends concentrically about the coil across spiral shape heater wire 104, for use as the supporting member of heater With electric current return.Although the electric current line of return 106 is described as being concentrically disposed with across coil, it be can not be especially medially In coil, and it can change over the whole length relative to the position of coil.The electric current line of return 106 can be for example Ceramic insulated wire flexible, high temperature is specified.The illustrative temperature rating of the electric current line of return 106 is 1000 DEG C or close to 1000 DEG C, and therefore, in this case, mica and ceramics braiding insulator on nickel wire conductor may be suitable.It is other Examples of materials includes mica and fibre glass insulation on nickel plated copper wire；Although this option provides lower TempNominal Value.The electric current line of return 106 is also configured as the uninsulated line manually wrapped up with high temperature insulator.For example, exposed nickel plating Line or blank nickel bonding wire useful ceramics fibre cartridge band manually wrap up, to form the insulation current line of return flexible.Electric current returns The outer diameter of line 106 can be in the conventional linear dimension model of 50AWG to 000AWG (its diameter for corresponding to about 0.025 millimeter to 10 millimeters) In enclosing.In another illustrated embodiment, the model of the diameter of the electric current line of return 106 about 1 millimeter to 7 millimeters (17 to 1AWG) In enclosing.Illustratively, the diameter of the electric current line of return 106 provides enough structure supports and enough surface areas to reduce resistance. In illustrated embodiment, the electric current line of return 106 is occupied by the threaded interior space of the coil definition of spiral shape heater wire 104 Range be 0.1% to 99%.In the exemplary embodiment, the sky in threaded interior space that the electric current line of return 106 occupies Between in the range of 16% to 71%.

The section for setting screw shape heater wire 104 is also shown in Fig. 1 (including maintaining selected loop density) Be electrically insulated centralizer 108a, 108b.

Fig. 2 is the schematic diagram of heater well 101 for heating, which is used for soil, underground water or rock To remove pollutant.In illustrated embodiment, the submergence part 124 of heater well 101 is placed on as pollutant removal Soil, underground water or the rock (also referred to as " repair materials ") of target are interior.The submergence part 124 of heater well 101 can by Hole 122 is drilled out or gone out in repair materials and is inserted into casing 102 to be formed.Hole 122 shown in dotted line, and depict casing 102 cross section.As used herein, the installation for referring to and forming hole 122 by compressing or moving subsurface materials " is gone out " Method.In other underground embodiments, hole 122 can not be lined with casing, or can be lined with another material or component.For example, It may not be needed lining in firm, strong basement rock.The submergence part 124 of heater well 101 also is present in be added on the ground In heat application.For example, if excavating soil or rock and stacking or be deposited at earth's surface, the submergence part of heater well 101 124 can handle on the ground application in extend through repair materials interface 110.Therefore, " submergence part " is intended to indicate that heater well 101, part in repair materials or its adjacent material.Repair materials interface 110 is limited to repair materials to be processed The layer that (soil, underground water or rock) is separated with its ambient.On the ground or in underground application, casing 102 may extend to reparation Quite long distance in material.In applying on the ground, several hundred feet of casing 102 can horizontally be arranged or otherwise non- It is vertically disposed in soil, rock or underground water for heating.In underground application, casing 102 may extend to probing and set Depth (usually in the range of 30 meters to 60 meters) can be achieved to be used for environment remediation application in standby maximum.

Optional reducer 114 is located at the top edge of casing 102.Reducer 114 and channel (pass-through) The 112 cross section pipeline areas provided are less than the cross section pipeline area of casing 102, perpendicular outside target repair materials to reduce Directly-heated conduction and convection current.Although reducer 114 is shown as bell reducer, it can also be used and effectively reduce diameter to channel 112 equivalent accessory, such as reduce bushing.The temperature of heat loss and surface elements would generally be reduced by reducing vertical heat transfer and convection current Degree.Insulating materials 156 may also placed in channel 112, to further prevent or reduce the conduction and the advection heat that leave casing 102 Transmitting.Insulating materials 156 can be made of the flexible insulation medium of any high temperature, such as mineral wool, mineral wool or ceramic cloth.Channel 112 can be made of stainless steel or ceramics, to further decrease its thermal conductivity.Channel 112 accommodates current transmission line 118 and electric current returns Loop line 106.Illustratively, current transmission line 118 and the electric current line of return 106 are all the insulated wires with high temperature rated value.Channel 112 bearing electric connection boxes or " terminal box " 130.Terminal box 130 can take many forms, including form known in the art.Cause It is generally near environment temperature for terminal box 130, so it may use that standard electrical component.Current transmission line 118 and electric current return Line 106 is respectively connected to power supply line 152, power supply line 154 in terminal box 130.Power supply line 152, power supply line 154 are provided from electricity The electric power in source 160, power supply 160 apply different voltage to electric wire 152, electric wire 154.Power supply line 152, power supply line 154 can be Such as standard copper wire, and any conventional attachment device (for example, passing through line nut 150 as shown in Figure 2) point can be passed through It is not connected to current transmission line 118 and the electric current line of return 106.

Spiral shape heater wire 104 is arranged in casing 102.The electric current line of return 106 is located in spiral shape heater wire 104.The One centralizer 108a and the second centralizer 108b location current line of return 106 and spiral shape heater wire 104.First centralizer 108a It can provide being electrically insulated for spiral shape heater wire 104 and the electric current line of return 106 and casing 102 with the second centralizer 108b.In order to exhausted Edge purpose, the first centralizer 108a and the second centralizer 108b can be by for example ceramic (for example, aluminium oxide, mullite or zirconium oxides) Or porcelain or them can be born during operation by other suitable high temperature insulating material systems of exposure temperature in systems At.

In the exemplary embodiment, one or more centralizers are installed on the electric current line of return 106.In Fig. 2, first Centralizer 108a and the second centralizer 108b correspond respectively to lower part and upper position, it should be noted, however, that heater well 101 Submergence part 124 need not be vertical.The submergence part 124 of heater well 101 can be positioned as needed to reach expectation Heating location.This may include the submergence part 124 of position heater well 101 to avoid the structure near interference.Heater well 101 can be positioned below the object of permanent positioning or stationary positioned.

Electric current is delivered to spiral shape heater wire 104 by current transmission line 118 by power supply line 152, and current transmission line 118 exists Channel 112 is passed through at or near the top of heater well 101.Channel 112 extends in terminal box 130.Channel 112 can be example Such as stainless steel tube or other hollow parts of reduction heat transfer and convection current.In the exemplary embodiment, channel 112 is that diameter is 12 to 152 millimeters of 304 type stainless steel tubes.As the other component of heater well 101, the optimal material in channel 112 is at least It is partly dependent on environment.For example, under certain conditions, corrosion resistant metal or alloy may be beneficial.Current transmission line 118 are connected to the spiral shape heater wire 104 at the top of target repair materials.

Spiral shape heater wire 104 is by wiring connector 132 towards heater well 101 or at the bottom of heater well 101 It is connected to the electric current line of return 106 of insulation, wiring connector 132 can be high temperature banjo fixing butt jointing or other pressing connectors.It can make With spiral shape heater wire 104 is connected to the insulation current line of return 106 and is used to provide the other component of necessary electrical quality. Spiral shape heater wire 104 extends different distances in casing 102, but in the exemplary embodiment, be not extended to than away from From the space that " X " reserves thermal expansion closer to the bottom of casing 102, distance " X " is equivalent to entire flexible screw shape heating About the 2% of the length of device 100.For example, if the length of flexible screw shape heater 100 is 10 meters, in flexible screw shape The bottom of heater 100 should exist at a distance from 0.2 meter (the 2% of 10 meters) " X " between the bottom of casing 102.

The pitch (i.e. the density of coil) of spiral shape heater wire 104 over the whole length is alterable, and can also have The section of non-coiling.Fig. 2 shows the first coiling sections for extending and having relatively high loop density from current transmission line 118 134.Second coiling section 136 extends below the first coiling section 134, and has lower loop density.Due to coil Density is higher, and the region around the first coiling section 134 will be defeated with the higher heat in region coiled around section 136 than second Out.Third coiling section 138 be shown as further extending in heater well 101, the third coiling section 138 in, line Enclosing has the density similar with the coil in the first coiling section 134.Due to many, it is expected that the variation of thermal output, wherein One heat loss the reason is that counteracting target is heated at the top and bottom of volume, and therefore away from heater well certain distance Realize subsurface temperature more evenly in place.The coil of spiral shape heater wire 104 can be stretched or be compressed as needed, to realize to reparation The most suitable heating of the target part of material.For example, if a place is reached below ground 10 by fuel leakage contribution Rice (110 10 meters of lower section of repair materials interface), but known most of fuel is present between 2 meters to 5 meters of depth, then it will be in spiral shell Rotation shape heater wire 104 extends in casing 102 loop density that spiral shape heater wire 104 is compressed on 2 meters to 5 meters of section, To which each length generates the thermal output bigger than the line section with lower loop density.Expansible loop density is to add Lower loop density is provided in the other parts of hot device well 101.In addition, the loop density of the length along heater well 101 Distribution can change during heater operation interrupts.The illustrated embodiment of flexible screw shape heater 100 allows opposite It is easy and is completed in a short time this variation.It, can be by flexible screw shape heater 100 from casing 102 in illustrative methods Centralizer 108a, centralizer 108b can be slided from the electric current line of return 106, can redistribute loop density by middle removal, and Centralizer 108a, centralizer 108b can be back to the electric current line of return 106, installed with maintain loop density adjusted and Position.Additionally or alternatively, one or more centralizers can be removed.It is this to be easy to modify during allowing operator's adaptation operation The unexpected underground situation encountered, such as chilling room as caused by the underground water flowed into every.

Fig. 2 shows the second centralizer 108b being arranged between the first coiling section 134 and the second coiling section 136. First centralizer 108a is placed on 138 lower section of third coiling section and 132 top of wiring connector.Line can coil section second Centralizer position (such as shown in tape 142) between 136 and third coiling section 138 is wound.Centralizer can be placed in On tape 142.For example, tape 142 can be ceramic box band.

Fig. 3 depicts the centralizer 108 of the disc format with recess.While shown as round disk, but centralizer 108 Shape is not vital, and other shapes, such as triangle, square, polygon or irregular shape can be used in it, Its purpose and function are still maintained simultaneously.Recess 140 is provided, therefore can laterally shift centralizer 108 onto the electric current line of return On 106, to provide interference fit or frictional fit.Recess can be any shape for being capable of providing and suitably cooperating, therefore it can It is inserted into and is held in place.Other mechanisms can be used that centralizer 108 is fixed on the line of return 106, as long as they are filled Divide ground positioning centralising device, maintains desired loop density, and bear environment and heating process.Term " transverse direction " is herein In be widely used, and do not mean that accurate direction.Centralizer 108 can be placed between coil or coil and straight area On spiral shape heater wire 104 between section.Tape 142 can provide additional line at centralizer position and protect and increase friction Cooperation.When being placed into heater well 101, centralizer 108 can prevent spiral shape heater wire 104 from contacting casing 102.Centralizer The loop of spiral shape heater wire 104 can be also fixed to the electric current line of return 106 by 108, in selected depth sleeve pipe 102, to change calorific intensity amount as needed.The band recess configuration of centralizer 108 allows be directed to soil, underground water or rock Heating project during change loop density.

It returns to Fig. 2, the first centralizer 108a and the second centralizer 108b and is adequately secured to the electric current line of return 106, will coil Desired depth is maintained around section 134,136,138 and there is selected loop density.Although for illustrating mesh in Fig. 2 Show the section of three spiral wounds, but design may include the section of more or fewer spiral wounds, this depends on In the heat levels for needing how many kinds of different.

In configuration shown in Fig. 2, the diameter of the first centralizer 108a and the second centralizer 108b are greater than reducer 114 Narrowest part.Therefore, installation includes the hole drilled out in ground substantially with homogeneous diameter, is inserted into 104 He of spiral shape heater wire The electric current line of return 106, as needed extension and compression spiral shape heater wire 104, and the first centralizer of placement as needed 108a and the second centralizer 108b are to maintain desired coil compression or pitch.Then reducer 114 can be placed on appropriate position It sets, to reduce the diameter of the opening at the top of casing 102.

Fig. 2 shows two centralizers 108a, 108b.The coil according to needed for obtaining desired heating distribution or heating amount Density Distribution, it may be necessary to one or more centralizers, or if selecting uniform loop density, do not need using righting Device, unless for the needs of electrical isolation purpose or other benefits.Centralizer 108a, centralizer 108b prevent uninsulated spiral Shape heater wire 104 contacts steel sleeve 102 and simultaneously causes electric short circuit, this can diameter for example in casing 102 it is smaller or casing does not have Occur in the case where substantially vertical installation.If casing be not it is vertical, it is generally necessary to more centralizers.

In illustrated embodiment, the height of the different voltages potential at the both ends for being attached to spiral shape heater wire 104 is used Warm insulated wire is by feeding power to spiral shape heater wire 104.First end of the spiral shape heater wire 104 in spiral shape heater wire 104 Place is attached to current transmission line 118, and in the second attached at opposite ends to the electric current line of return 106.In illustrative embodiments In, spiral shape heater wire 104 is nickel chromium triangle, and the electric current line of return 106 and current transmission line 118 are 100% nickel, and surround The insulator of nickel wire is ceramic fibre braided fabric.Although should be noted that the described electric current line of return 104 and current transmission line Operation of the 118 instruction flexible screw shape heaters 100 under direct current (DC) mode, but lead to the electricity of spiral shape heater wire 104 Stream can be used as DC or alternating current (AC) conveying.

The embodiment of spiral shape heater wire 104 can provide greater flexibility in the design of heater well 101.It can be only On the spot change the following factor among other possible factors, to adjust the configuration and performance of heater well 101:

1. the voltage applied on flexible screw shape heater

2. calorific intensity

3. linear diameter

4. screw diameter

5. screw pitch/loop density.

For given calorific intensity, increase factor (such as biggish coil diameter of the surface area of spiral shape heater wire 104 Or lesser pitch) lead to lower coiling heater wire temperature.If it is desire to make spiral shape heater wire 104 more rigidity and more resistant to With can then reduce the specification of spiral shape heater wire 104, i.e., diameter increases.The changeability of factor allows heater well 101 to adapt to Large-scale situation and application.

In illustrated embodiment, the voltage applied on spiral shape heater wire 104 is in every foot of heated depth or adds In the range of 5 volts to every foot 15 volts of hot device well length.Calorific intensity is shown as 200 to 500W/ft.Illustrative spiral shape heating The specification of line 104 includes: that linear diameter is 6 to 18 specifications；Screw diameter is in the range of 12 millimeters to 25 millimeters；And pitch is 5 Millimeter is to 50 millimeters.Illustrative pitch range can be along the single disc of spiral shape heater wire 104 around section or in different disks Change between section.

The electric current line of return 106 of insulation is vital for flexible screw shape heater 100, because it provides bearing To hang spiral shape heater wire 104 and provide electric power to operate spiral shape heater wire 104.It is applicable to the electric current of various temperature The example of 106 material of the line of return is as follows.In the application of medium high temperature in expected heater well only lower than 200 DEG C, electric current The line of return 106 can be made of the copper wire with fluorinated polymer insulator (such as polytetrafluoroethylene (PTFE)).Extremely at expectable 200 DEG C In the case where temperature within the scope of 400 DEG C, the electric current line of return 106 can be by being wrapped in glass fibre, mica fiber or ceramic fibre Nickel-clad copper in insulator is constituted.Higher than 400 DEG C at a temperature of, the electric current line of return 106 can be by with ceramic fiber insulation body Nickel wire constitute.Such line may can't buy on the market, but can as desired by with ceramic fibre tape wrap up nickel wire come Construction.The coiling design of spiral shape heater wire 104 allows expansion in casing 102, at the same prevent spiral shape heater wire 104 with The brought into incidental contact of the wall of casing 102, because being expanded in coil.Changeable loop density (the heater of every specific length Or the quantity of the heater wire coil of " screw pitch "), so that the different depth interval in heater well 101 applies different add Calorific intensity.Centralizer 108a, centralizer 108b can be removed, with substantially any time gauge line circle density during use, packet It includes (if necessary) before or during heating project (such as soil, underground water or rock).

Flexible screw shape heater 100 can be used and repair pollutant to use various methods.In illustrated embodiment In, for example, by drilling machine in ground drilling bore hole.The casing that flexible screw shape heater 100 can be accommodated is installed in hole.It is soft Property spiral heater 100 transfers heat to contaminated ambient.Heat can be waved by increasing the vapour pressure of pollutant Send out the pollutant in soil.In other application, heat can increase the temperature of underground water, to enhance water-based chemistry reaction, thus The pollutant to destory the scene.For the compound with low volatility, heater well can apply high temperature chemically to divide Solve the molecular structure of pollutant.In general, a series of heated wells will be mounted in contaminated area.

Compared with conventional, bulky, rigid tubular heater, flexible screw shape heater 100 it is illustrative Embodiment can be easily installed, such as by being installed manually and only by a people, even if flexible screw shape heater 100 has There is sizable length.

Various embodiments of the invention have been described, each embodiment all has different element combinations.This hair It is bright to be not limited to disclosed particular implementation, but may include the omission of the various combination, some elements of disclosed element Or element is replaced by the equivalent of these structures.This method and heater may include previous existing element, including for example at this Element described in the background section of application.

When modifying quantity, such as " about ", the term of " about " includes typical measurement error or meets quantity purpose Amount.The Specific amounts of modification amount does not include for disclosed parameter yet.

Although having been illustrated by property embodiment describes the present invention, those skilled in the art will expect other excellent Point and modification.Therefore, the present invention is not limited to specific detail shown and described herein in its broader aspect.It is not departing from In the case where the spirit and scope of the present invention, it can modify to the combination of such as size and component materials and equivalent unit. Accordingly, it is intended that the present invention is not limited to specific illustrative embodiments, but in the appended claims and its equivalent Whole spirit and scope in explain.

Claims (15)

1. a kind of heating equipment, comprising:

The current transmission line of insulation is configured to connect to power supply, and extends below in ground level to soil, underground water or rock In opening in；

Uninsulated spirality resistance heater wire, has a first end and a second end；

The spirality resistance heater wire is electrically connected to the current transmission line of the insulation at its first end, and from the electricity Stream pipeline further extends in the opening；

The electric current line of return of insulation, has a first end and a second end, and the first end of the electric current line of return is electrically attached to the spiral shell Revolve the second end of shape resistance heater wire；And

The electric current line of return extends from the second end of the spirality resistance heater wire, and by by the spirality resistance The threaded interior space of the coil definition of heater wire returns, and further extends to ground level or more, and be configured to connect to The power supply.

2. heating equipment as described in claim 1 further includes one or more electrical isolation centralizers, one or more of electricity Insulating centralizer is configured to maintain the position of the section of the spirality resistance heater wire, and the spirality resistance is maintained to heat The loop density of the coil of the section of line.

3. heating equipment as claimed in claim 2, wherein one or more of one or more of centralizers are that have The disk of recess, wherein the recess configuration slides laterally at the permission centralizer to the electric current line of return, described recessed The size of mouth is determined at when one or more of centralizers are in operating position, prevents the spirality resistance heater wire Coil passes through the recess.

4. heating equipment as claimed in claim 2, wherein one or more of centralizers are configured to be attached to the electric current The line of return, and maintain one or more of centralizers along the position of the length of the electric current line of return.

5. heating equipment as described in claim 1 further includes heating calibration system.

6. heating equipment as described in claim 1, wherein the diameter of the spirality resistance heater wire at 0.025 millimeter extremely In the range of 10 millimeters.

7. heating equipment as claimed in claim 6, wherein the diameter of the spirality resistance heater wire is at 1 millimeter to 4 millimeters In the range of.

8. heating equipment as described in claim 1, wherein the coil for limiting the threaded interior space has in 5 millis Rice is to the diameter in the range of 150 millimeters.

9. heating equipment as described in claim 1, wherein the coil for limiting the threaded interior space has 0.5 Millimeter is to the diameter in the range of 25 millimeters.

10. heating equipment as described in claim 1, wherein the diameter of the electric current line of return is at 0.025 millimeter to 10 millimeters In the range of.

11. heating equipment as described in claim 1, wherein the spirality resistance heater wire has multiple selective spacers Coil, wherein selected coil pitch controls the calorific intensity generated by the spirality resistance heater wire.

12. the method that the soil of a kind of pair of underground, underground water or rock are heated, comprising:

The flexible screw shape resistance heater wire for being attached to the flexible current line of return is provided；

For one or more sections of the length along heater well, one or more calorific intensitys are selected；

Select the voltage applied on the spirality resistance heater wire, the diameter of the spirality resistance heater wire and coil straight One or more of diameter, to obtain selected one or more heating intensities；

The flexible screw shape resistance heater wire for being attached to the flexible current line of return is inserted into the heater well.

13. method as claimed in claim 12, further includes:

It is inserted into the heater well in the flexible screw shape resistance heater wire that will be attached to the flexible current line of return Before, one or more centralizers are positioned along the spirality resistance heater wire, to maintain the spirality resistance heater wire One or more sections length, and maintain the spirality resistance heater wire one or more of sections it is selected The loop density selected.

14. method as claimed in claim 13, further includes:

One or more centralizers in one or more of centralizers are relocated along the spirality resistance heater wire, To maintain the length of one or more sections of the spirality resistance heater wire newly selected, and maintain the spiral shape electricity The selected loop density of one or more of sections of heater wire is hindered, so as to adjust the calorific intensity.

15. method as claimed in claim 12, further includes:

The coil pitch of spirality resistance heater wire is selected, to obtain selected one or more heating intensities.