WO2019143355A1 - Dispositif de chauffage hélicoïdal flexible - Google Patents

Dispositif de chauffage hélicoïdal flexible Download PDF

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Publication number
WO2019143355A1
WO2019143355A1 PCT/US2018/014472 US2018014472W WO2019143355A1 WO 2019143355 A1 WO2019143355 A1 WO 2019143355A1 US 2018014472 W US2018014472 W US 2018014472W WO 2019143355 A1 WO2019143355 A1 WO 2019143355A1
Authority
WO
WIPO (PCT)
Prior art keywords
wire
electrical resistance
heating wire
helical
resistance heating
Prior art date
Application number
PCT/US2018/014472
Other languages
English (en)
Inventor
Daniel Oberle
Gregory L. Beyke
Collin O'brien
Jacob Seeman
Emily Crownover
Original Assignee
Trs Group, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Trs Group, Inc. filed Critical Trs Group, Inc.
Priority to CA3051115A priority Critical patent/CA3051115A1/fr
Priority to CN201880004620.9A priority patent/CN110290953A/zh
Priority to BR112019015502-3A priority patent/BR112019015502A2/pt
Priority to EP18900597.8A priority patent/EP3568310A1/fr
Priority to PCT/US2018/014472 priority patent/WO2019143355A1/fr
Priority to US16/452,141 priority patent/US10675664B2/en
Publication of WO2019143355A1 publication Critical patent/WO2019143355A1/fr
Priority to US16/864,889 priority patent/US20200260533A1/en

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/54—Heating elements having the shape of rods or tubes flexible
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • B09C1/06—Reclamation of contaminated soil thermally
    • B09C1/062—Reclamation of contaminated soil thermally by using electrode or resistance heating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/0072—Special adaptations

Definitions

  • Thermal conduction heater wells have application for removing contaminants from soil, groundwater or rock. Thermal conduction heater wells are heating devices that are typically placed into the ground or soil pile to deliver heat energy into a contaminated media. In most applications, drill rigs are used to auger holes into the ground to install a metal casing that can accommodate a heating device to transfer heat to the contaminated surroundings.
  • Heaters comprised of stiff tubing are also currently used; stainless steel is a common material of construction. Cranes or lift equipment are required to elevate the stiff, pre-constructed, heaters to vertically place them into metal casings below grade. Long conventional heaters must be manufactured on-site because they are too long to ship when pre-constructed. There is no way to change the amount of heating energy delivered for different depth intervals of the heater during the project.
  • Another thermal conduction heating technology includes installing casings in the ground and pushing hot gas internally through the casing to heat the subsurface.
  • the hot gas is usually supplied by a number of natural gas or propane burners and each burner requires an expensive control system and safety measures. This presents problems such as inefficient energy usage due to the large amount of heat loss in the hot gas exhausted to the air from the heaters and the build-up of acidic condensate in the piping systems during early phases of heating.
  • These gas injection piping systems utilize a pipe inside a pipe and therefore are also bulky and heavy. The minimum outside pipe diameter for these systems is typically four to six inches in diameter.
  • gas heater wells have no practical method to vary the heat output at various depths.
  • the current practice in subsurface heating continues to be the installation of stiff tubular heaters that are difficult to ship and install and that cannot be modified to provide heating at different depth intervals or easily modified during differing stages of the project.
  • the systems are bulky and require borings of large diameter to support the heater elements.
  • a flexible helical heater having a helical electrical resistance heating wire connected to a current return wire.
  • the helical electrical resistance heating wire is coiled around the current return wire.
  • the density or pitch of the coils in one or more heating wire sections is maintained by positioning one or more centralizers along the current return wire to create desired heat intensities.
  • the flexible helical heater may be inserted into a casing positioned in a subsurface hole to provide thermal conduction heating to remove contaminants from soil, groundwater or rock.
  • FIG. 1 depicts an embodiment of a flexible heater being inserted into a heater well casing.
  • FIG. 2 is a schematic of a heater well used for subsurface heating applications having a resistance heating wire coiled around a current return wire, wherein the coil density can be adjusted to obtain desired heating intensities.
  • the flexible helical heater is shown within a cross-section of other components that together comprise the heater well.
  • FIG. 3 depicts a centralizer in the form of a notched centralizer.
  • Embodiments of the flexible helical heater include an electrical resistance heating wire coiled about a current return wire that may be shipped and installed more easily than conventional heaters, and may provide adjustability of heating at different levels.
  • Embodiments of the flexible helical heater can be compressed like a spring to create a more compact product for shipping or otherwise transporting.
  • the flexible helical heater may fit inside a subsurface metal casing of much smaller diameter than is typically used in the industry when employing stiff heaters. Special equipment needed to install stiff, tubular heaters, such as cranes or other lift equipment, may not be needed with embodiments of the flexible helical heater.
  • the flexible helical heater can fit inside a pipe as small as 25 millimeters to 50 millimeters in diameter.
  • Coil density or helix pitch can be modified to regulate heating for different depths.
  • “coil density” is the number of coils per length unit and is the inverse of helix pitch. Changes in heating may be more easily implemented in the field after a project has started than with stiff, tubular heaters.
  • the flexible helical heater is more light-weight than conventional stiff heaters, which may make it easier and safer to install.
  • a generally circular type coil will typically be easiest to create and empty but other shape coiling can achieve similar effects and devices.
  • FIG. 1 depicts an embodiment of a flexible helical heater 100 being inserted into a heater well casing 102, which typically comprises metal.
  • Flexible helical heater 100 has a helical heating wire 104, which may be for example, a NiChrome wire, or other suitable electric resistance heating wire.
  • helical heating wire 104 is a flexible, high-temperature wire.
  • NiChrome wires wires consisting of other suitable alloys or metals may be used.
  • iChrome refers to a nickel-chromium alloy. Nickel-chromium alloys that contain other metals may also be used. Typically nickel will be the primaiy metal in the alloy, i.e.
  • helical heating wire 104 may have a diameter in the range of 0.025 millimeters to approximately 10 millimeters, which may be, for example, a NiChrome wire gauge in the size range of 000 to 50 American Wire Gauge (AWG). In a further illustrative embodiment, the diameter of helical heating wire 104 is in the range of 1 to 4 millimeters (17 to 6 AWG). Generally, the diameter of helical heating wire 104 is selected for optimum flexibility and coil density.
  • An illustrative helix internal diameter may range from 5 millimeters to greater than 150 millimeters when used in a large casing.
  • helical heating wire 104 will have an internal helix diameter in the range of 6 millimeters to 40 millimeters. Helical heating wire 104 in this range will typically allow for insertion into small casings which may save time and money. Heat from helical heating wire 104 is transferred to heater well casing 102.
  • a current return wire 106 runs concentrically through the coils of helical heating wire 104 to serve as both a support for the heater and an electrical current return.
  • current return wire 106 is described as being concentrically disposed through the coils, it may not be specifically centered within the coils, and its position with respect to the coils may vary throughout its length.
  • Current return wire 106 may be, for example, a flexible, high- temperature rated, ceramic-insulated wire.
  • An illustrative temperature rating of current return wire 106 is at or near 1000 °C, and therefore, in which case mica and ceramic-braided insulation on a nickel wire conductor may be suitable.
  • Other examples of materials include mica and fiberglass insulation on nickel-plated copper wire; although this option offers a lower temperature rating.
  • Current return wire 106 may also be constructed as an uninsulated wire that is manually wrapped with a high-temperature insulation.
  • bare nickel- plated wire or stock nickel welding wire may be manually wrapped with a ceramic fiber tape to create a flexible, insulated current return wire.
  • Current return wire 106 may have an outer diameter in the range of typical wire sizes ranging from 50 AWG to 000 AWG (which corresponds to approximately 0.025 millimeters to 10 millimeters in diameter). In a further illustrative embodiment, the diameter of current return wire 106 is in the range of approximately 1 millimeter to 7 millimeters (17 to 1 AWG). Illustratively, the diameter of current return wire 106 provides sufficient structural support and adequate surface area to reduce resistance.
  • current return wire 106 occupies helix- internal space defined by coils of helical heating wire 104 in the range of 0.1 to 99%. In an exemplary embodiment, the space occupied by current return wire 106 within the helix- internal space is in the range of 16 to 71%.
  • FIG. 1 Further shown in FIG. 1 is an electrically-insulating centralizers 108a, 108b to position sections of helical heating wire 104, including maintaining selected coil density.
  • FIG. 2 is a schematic of a heater well 101 used for heating, with applications of soil, groundwater or rock to remove contaminants.
  • the submersed portion 124 of heater well 101 is placed within the soil, groundwater or rock (also called the “remediation material”) that is targeted for contaminant removal.
  • Submersed portion 124 of heater well 101 may be created by boring or punching a hole 122 into the remediation material and inserting a casing 102.
  • Hole 122 is shown by a broken line and a cross section of casing 102 is depicted.
  • “punched” means an installation method in which a hole 122 is formed by compressing or displacing subsurface material.
  • hole 122 may not be lined with a casing or may be lined with another material or component. For example, no lining may be required in solid, competent, bedrock.
  • Submersed portion 124 of heater well 101 may also exist in an above-ground heating application.
  • submersed portion 124 of heater well 101 may extend through the remediation material interface 1 10 in an above-ground treatment application.
  • “submersed portion” is intended to mean the portion of heater well 101 that is within the remediation material or its surrounding material.
  • Remediation material interface 110 is defined as the layer that separates the remediation material to be treated (soil, groundwater or rock) from its surroundings.
  • casing 102 may extend into the remediation material for a significant distance.
  • casing 102 may be laid out horizontally or otherwise, non-vertical ly, within the soil, rock or groundwater for heating.
  • casing 102 may extend to the maximum achievable depth of drilling equipment, typically in the range of 30 meters to 60 meters for environmental remediation applications.
  • reducer 1 14 At the top edge of casing 102 is optional reducer 1 14.
  • Reducer 1 14 and a pass-through 1 12 provide a cross-sectional pipe area less than that of casing 102 to reduce vertical thermal conduction and convection outside the targeted remediation material.
  • reducer 1 14 is illustrated as a bell reducer, an equivalent fitting that effectively reduces the diameter to pass-through 1 12 may be used, such as a reducing bushing. Reducing the vertical thermal conduction and convection typically reduces heat losses and the temperature of surface components.
  • Insulating material 156 may also be placed within pass-through 1 12 to further prevent or reduce conductive and convective heat transfer out of casing 102.
  • Insulating material 156 may consist of any high-temperature flexible insulating media such as mineral wool, glass wool or ceramic cloth.
  • Pass-through 1 12 might be constructed of stainless steel or ceramic to further reduce its thermal conductivity. Pass-through 1 12 accommodates a current delivery wire 1 18, and current return wire 106. Illustratively, both current delivery wire 118 and current return wire 106 are insulated wires that have high temperature rating. Pass-through 1 12 supports electrical connection box or“junction box” 130. Junction box 130 can take many forms, including those known in the art. Because junction box 130 is typically near ambient temperature, it can use standard electrical components. Current delivery wire 1 18 and current return wire 106 connect to power source wires 152, 154, respectively, within junction box 130. Power source wires 152, 154 provide electrical power from a power source 160, which applies different voltages to wires 152, 154. Power Source wires 152, 154 may be, for example, standard copper wires, and may be connected to current delivery wire 118 and current return wire 106, respectively, by any conventional connection means, for example by wire nuts 150 as illustrated in FIG. 2.
  • Helical heating wire 104 is disposed within casing 102. Within helical heating wire 104 is current return wire 106. A first centralizer 108a and second centralizer 108b position current return wire 106and helical heating wire 104. First and second centralizers 108a, 108b may provide electrical insulation of helical heating wire 104 and current return wire 106 from casing 102. For insulation purposes, first and second centralizers 108a, 108b may be made of, for example, ceramic (for example; alumina, mullite or zirconia) or porcelain, or other suitable high temperature insulating material that can withstand the temperatures to which they will be exposed in the system during operation.
  • ceramic for example; alumina, mullite or zirconia
  • porcelain or other suitable high temperature insulating material that can withstand the temperatures to which they will be exposed in the system during operation.
  • first and second centralizers 108a, 108b correspond to lower and upper positions, respectively, however, it is noted that submersed portion 124 of heater well 101 need not be vertical, submersed portion 124 of heater well 101 may be positioned as necessary to reach desired heating locations. This may include positioning submersed portion 124 of heater well 101 to avoid interference with structures in the vicinity. Heater well 101 may be positioned below permanently-located or fixedly-located objects.
  • Pass-through 112 extends into junction box 130.
  • Pass-through 112 may be for example, a stainless steel pipe or other hollow component that reduces thermal conduction and convection.
  • pass-through 1 12 is a 12 to 152 millimeter diameter type 304 stainless steel pipe.
  • the optimum material of pass-through 1 12, like other components of heater wel 1 101, depends, at least in part, on the environment. For example, in certain conditions, corrosion-resistant metals or alloys may be beneficial.
  • Current delivery wire 1 18 connects to helical heating wire 104, at the top of the targeted remediation material.
  • Helical heating wire 104 is connected to an insulated current return wire 106 toward or at the bottom of heater well 101 with a wire connector 132, which may be a high-temperature butt splice or other crimp connector. Other components that connect helical heating wire 104 to insulated current return wire 106 and function to provide the necessary electrical qualities may be used.
  • Helical heating wire 104 extends to varying distances within casing 102, but in an exemplary embodiment does not extend any closer to the bottom of casing 102 than a distance“X” equivalent to approximately 2% of the length of the entire flexible helical heater 100 in order to allow room for thermal expansion. For example, if the flexible helical heater 100 were 10 meters in length, a distance“X” of 0.2 meters (2% of 10 meters) should exist between the bottom of flexible helical heater 100 and the bottom of casing 102.
  • Helical heating wire 104 may vary in pitch, i.e. density of the coils, throughout its length, and may also have non-coiled sections.
  • FIG. 2 shows a first coiled section 134 extending from current delivery wire 1 18, and having a relatively high coil density.
  • a second coiled section 136 extends below first coiled section 134, and has a lower coil density.
  • the area surrounding first coiled section 134 will have a higher heat output than the area surrounding second coiled section 136 because of the higher density of coils.
  • a third coiled section 138 is shown extending further into heater well 101, in which the coils have a similar density to that in first coiled section 134.
  • Variation in heat output is desired for many reasons, one of which is to counter heat losses at the top and the bottom of the targeted heated volume, and therefore, achieve a more uniform subsurface temperature at a distance from the heater well.
  • the coils of helical heating wire 104 may be pulled apart or compressed as desired to achieve the most appropriate heating for targeted portions of the remediation material.
  • the coil density of helical heating wire 104 would be compressed across a section of helical heating wire 104 extending from 2 to 5 meters into casing 102, thereby creating a greater heat output per length than a wire section with lower coil density.
  • the coil density may be expanded to provide a lower coil density in other portions of heater well 101.
  • the distribution of coil density along the length of heater well 101 can be varied during a break in heater operation. Illustrative embodiments of flexible helical heater 100 may allow such variations to be accomplished relatively easily and in a short period of time.
  • flexible helical heater 100 can be removed from casing 102, centralizers 108a, 108b can be slipped off current return wire 106, the coil density can be redistributed and centralizers 108a, 108b returned to the current return wire 106, installed to maintain the adjusted coil density and position. Additionally, or instead, one or more centralizers may be removed. This ease of modification allows the operator to adjust to unexpected subsurface conditions encountered during operation, such as a cool interval caused by inflowing groundwater.
  • FIG. 2 shows second centralizer 108b disposed between first coiled section 134 and second coiled section 136. First centralizer 108a is placed below third coiled section 138 and above wire connector 132.
  • Wires may be wrapped at centralizer locations, such as shown by tape 142, between second coiled sections 136 and third coiled section 138.
  • a centralizer may be placed over tape 142.
  • Tape 142 may be ceramic tape, for example.
  • FIG. 3 depicts a centralizer 108 in the form of a notched disk. Although shown as a circular disk, the shape of centralizer 108 is not critical and it may take on other shapes such as a triangle, square, polygon or irregular shape while still maintaining its purpose and function.
  • Notch 140 is provided so centralizer 108 can be pushed laterally onto current return wire 106 to provide an interference fit or friction fit.
  • the notch may be any shape that can provide the proper fit so it can be inserted and remains in place.
  • Centralizer 108 may be placed on helical heating wire 104 either between coils or between a coiled and straight section. Tape 142 may provide extra wire protection at the centralizer location and increase the friction fit. Centralizerl08 may prevent helical heating wire 104 from contacting casing 102 when placed into heater well 101. Centralizer 108 also may secure loops of helical heating wire 104 to current return wire 106 at selected depths into casing 102 to alter the amount of heat intensity as desired. The notched configuration of centralizerl 08 allows coil-density to be changed during a heating project for soil, groundwater or rock.
  • first and second centralizers 108a, 108b are secured to current return wire 106 sufficiently to maintain coiled sections 134, 136, 138 at the desired depths and with the selected coil density. Although three helically coiled sections are shown for illustration purposes in FIG. 2, the design may include more or less helically coiled sections depending on how many different levels of heating are desired. In the configuration shown in FIG. 2, first and second centralizers ! 08a, 108b have a larger diameter than the narrowest part of reducer 1 14.
  • installation includes boring a hole into the ground, roughly of uniform diameter, inserting helical heating wire 104 and current return wire 106, expanding and compressing helical heating wire 104 as desired and placing first and second centralizers 108a, 108b as needed to maintain the desired coil compression or pitch.
  • Reducer 1 14 may then be put in place to reduce the diameter of the opening at the top of casing 102.
  • FIG. 2 shows two centralizers 108a, 108b.
  • one or more centralizer may be needed, or if a uniform coil density is chosen, then no centralizers need to be used, unless required for electrical isolation purposes or other benefits.
  • Centralizers 108a, 108b prevent uninsulated helical heating wire 104 from contacting steel casing 102 and causing an electrical short circuit, which may occur for example, in situations where the diameter of casing 102 is small or the casing is not installed perfectly vertical. If the casing is not vertical, then generally more centralizers are required.
  • power is fed to helical heating wire 104 using high- temperature insulated wires of different voltage potential attached to both ends of helical heating wire 104.
  • Helical heating wire 104 attaches to current delivery wire 1 18 at a first end of helical heating wire 104, and to current return wire 106 at a second, opposite end.
  • helical heating wire 104 is NiChrome and current return wire 106 and current delivery wire 118 are 100% nickel and the insulation surrounding the nickel wire is a ceramic-fiber braid. Note that although current return wire 104 and current delivery wire 118 as described indicate operation of the flexible helical heater 100 in a direct current (DC) mode, electrical current to the helical heating wire 104 may be delivered as either DC or alternating current (AC).
  • DC direct current
  • AC alternating current
  • Embodiments of helical heating wire 104 may provide greater flexibility in the design of heater well 101. The following factors, among possible others, may be independently varied to adjust the configuration and performance of heater well 101 :
  • helix pitch / coil density For a given heat intensity, factors that increase the surface area of helical heating wire 104, such as larger coil diameter or smaller pitch, result in a lower coiled heating wire temperature.
  • the gauge of helical heating wire 104 can be decreased, i.e. diameter increased, if it is desired to make helical heating wire 104 stiffer and more durable. The variability of the factors, may allow heater well 101 to be tailored to a wide range of situations and applications.
  • the applied voltage across helical heating wire 104 is in the range of 5 volts per foot to 15 volts per foot of heated depth or heater well length.
  • the heat intensity is illustratively 200-500 W/ft.
  • Illustrative helical heating wire 104 specifications include, a wire diameter of 6-18 gauge; a helix diameter in the range of 12 millimeters to 25 millimeters; and a pitch of5 millimeters to 50 millimeters.
  • the illustrative pitch range may be varied along a single section coiled section of helical heating wire 104 or between different coiled sections.
  • the insulated current return wire 106 is critical to flexible helical heater 100 in that it provides the support to suspend, and the power to operate, helical heating wire 104.
  • current return wire 106 examples include copper wire with a fluorinated polymer insulation, such as Teflon. Where temperatures in the range of 200°C to 400'C may be anticipated, current return wire 106 may be constructed of nickel- coated copper wrapped in a glass-fiber, mica-fiber or ceramic-fiber insulation. At temperatures above 400°C, current return wire 106 may be constructed of nickel wire with a ceramic-fiber insulation. Such wires may not be available in the market-place, but may be constructed as needed by wrapping a nickel wire with ceramic fiber tape.
  • the coiled design of helical heating wire 104 allows for expansion inside casing 102 while preventing incidental contact of helical heating wire 104 with the walls of casing 102 because the expansion is taken up in the coils.
  • the coil density (number of heating wire coils per specific length of heater or“helix pitch”) can be changed to apply different heating intensities at different depth intervals of heater well 101.
  • Centralizers 108a, 108b can be removed to adjust coil density at nearly any time during use, including prior to or in the middle of a heating project, such as for example, soil, groundwater or rock, if needed.
  • Flexible helical heater 100 may be employed to remediate contaminants using various methods.
  • a hole is bored into the ground, for example by a drill rig.
  • a casing that can accommodate flexible helical heater 100 is installed into the hole.
  • Flexible helical heater 100 transfers heat to the contaminated surroundings. The heat may volatilize contaminants in the soil by increasing the vapor pressure of the contaminants. In other applications, the heat may increase the temperature of groundwater to enhance aqueous-based chemical reactions which destroy the contaminants in place. For compounds that have low volatility, high temperatures may be applied by the heater well to chemically break down the molecular structure of the contaminants. Typically, a series of heater wells will be installed in a contaminated area.
  • illustrative embodiments of flexible helical heater 100 may be easily installed, for example by hand and by only one person, even if flexible helical heater 100 is of substantial length.

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Resistance Heating (AREA)

Abstract

L'invention concerne un dispositif de chauffage comprenant un fil chauffant à résistance électrique hélicoïdale connecté à un fil de retour de courant et enroulé autour de celui-ci. Le dispositif de chauffage est utilisé dans des puits de chauffage à conduction thermique utilisés pour éliminer des contaminants à partir du sol, de l'eau souterraine ou de la roche.
PCT/US2018/014472 2018-01-19 2018-01-19 Dispositif de chauffage hélicoïdal flexible WO2019143355A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
CA3051115A CA3051115A1 (fr) 2018-01-19 2018-01-19 Dispositif de chauffage helicoidal flexible
CN201880004620.9A CN110290953A (zh) 2018-01-19 2018-01-19 柔性螺旋形加热器
BR112019015502-3A BR112019015502A2 (pt) 2018-01-19 2018-01-19 aquecedor helicoidal flexível
EP18900597.8A EP3568310A1 (fr) 2018-01-19 2018-01-19 Dispositif de chauffage hélicoïdal flexible
PCT/US2018/014472 WO2019143355A1 (fr) 2018-01-19 2018-01-19 Dispositif de chauffage hélicoïdal flexible
US16/452,141 US10675664B2 (en) 2018-01-19 2019-06-25 PFAS remediation method and system
US16/864,889 US20200260533A1 (en) 2018-01-19 2020-05-01 Pfas remediation method and system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2018/014472 WO2019143355A1 (fr) 2018-01-19 2018-01-19 Dispositif de chauffage hélicoïdal flexible

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
US15/875,543 Continuation US10201042B1 (en) 2018-01-19 2018-01-19 Flexible helical heater
PCT/US2019/039020 Continuation-In-Part WO2020005966A1 (fr) 2018-01-19 2019-06-25 Procédé et système de remédiation de pfas

Related Child Applications (2)

Application Number Title Priority Date Filing Date
PCT/US2019/039020 Continuation-In-Part WO2020005966A1 (fr) 2018-01-19 2019-06-25 Procédé et système de remédiation de pfas
US16/452,141 Continuation-In-Part US10675664B2 (en) 2018-01-19 2019-06-25 PFAS remediation method and system

Publications (1)

Publication Number Publication Date
WO2019143355A1 true WO2019143355A1 (fr) 2019-07-25

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Application Number Title Priority Date Filing Date
PCT/US2018/014472 WO2019143355A1 (fr) 2018-01-19 2018-01-19 Dispositif de chauffage hélicoïdal flexible

Country Status (5)

Country Link
EP (1) EP3568310A1 (fr)
CN (1) CN110290953A (fr)
BR (1) BR112019015502A2 (fr)
CA (1) CA3051115A1 (fr)
WO (1) WO2019143355A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110508604A (zh) * 2019-08-02 2019-11-29 中科鼎实环境工程有限公司 高效节能的燃气热脱附设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3153342A (en) * 1961-09-07 1964-10-20 Norton T Pierce Fluent material level measuring apparatus and method of manufacturing the same
US3813771A (en) * 1973-07-02 1974-06-04 Gen Electric Method of producing electrical resistance heaters, and the improved heater products
US5221827A (en) * 1992-02-12 1993-06-22 Shell Oil Company Heater blanket for in-situ soil heating
US20100147826A1 (en) * 2008-12-11 2010-06-17 Schlipf Andreas Cartridge type heater
US20110295504A1 (en) * 2008-10-24 2011-12-01 Kenneth Willis Barber Moisture detection wire, a moisture detection system, and a method of detecting moisture

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3153342A (en) * 1961-09-07 1964-10-20 Norton T Pierce Fluent material level measuring apparatus and method of manufacturing the same
US3813771A (en) * 1973-07-02 1974-06-04 Gen Electric Method of producing electrical resistance heaters, and the improved heater products
US5221827A (en) * 1992-02-12 1993-06-22 Shell Oil Company Heater blanket for in-situ soil heating
US20110295504A1 (en) * 2008-10-24 2011-12-01 Kenneth Willis Barber Moisture detection wire, a moisture detection system, and a method of detecting moisture
US20100147826A1 (en) * 2008-12-11 2010-06-17 Schlipf Andreas Cartridge type heater

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110508604A (zh) * 2019-08-02 2019-11-29 中科鼎实环境工程有限公司 高效节能的燃气热脱附设备

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Publication number Publication date
CN110290953A (zh) 2019-09-27
BR112019015502A2 (pt) 2020-07-28
EP3568310A1 (fr) 2019-11-20
CA3051115A1 (fr) 2019-07-25

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