US20190376726A1 - Heat exchanger and method - Google Patents
Heat exchanger and method Download PDFInfo
- Publication number
- US20190376726A1 US20190376726A1 US16/414,583 US201916414583A US2019376726A1 US 20190376726 A1 US20190376726 A1 US 20190376726A1 US 201916414583 A US201916414583 A US 201916414583A US 2019376726 A1 US2019376726 A1 US 2019376726A1
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- United States
- Prior art keywords
- coil
- heater
- tank
- heat transfer
- heat exchanger
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
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Classifications
-
- 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
- F24H7/00—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release
- F24H7/02—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid
-
- 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
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/0206—Heat exchangers immersed in a large body of liquid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/0206—Heat exchangers immersed in a large body of liquid
- F28D1/0213—Heat exchangers immersed in a large body of liquid for heating or cooling a liquid in a tank
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/0226—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with an intermediate heat-transfer medium, e.g. thermosiphon radiators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
- F28D1/0472—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being helically or spirally coiled
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F23/00—Features relating to the use of intermediate heat-exchange materials, e.g. selection of compositions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/0024—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for combustion apparatus, e.g. for boilers
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Definitions
- Fluid heating systems which have a tank, a heater, a liquid medium, and a pipeline for transferring a process fluid to be heated are typically referred to as indirect heaters or indirect line heaters, since the heater does not directly heat the process fluid.
- a pressurized coil transporting the fluid to be heated is serpentine in long lengths running from the front to back within a tank and above the firetube.
- the firetube is positioned below the coil in the lower arc of the tank, and the coil is in the higher arc of the tank.
- the area of displacement may be filled with a 50/50 glycol water solution as a heat transfer medium to absorb energy from the firetube which then transfers heat to the pressurized coil.
- heat from the firetube is transferred to the glycol medium, after which the energy is then transferred to the pressure coil to preheat, for example, a process fluid such as natural gas under pressure.
- a heat exchanger having a tank filled or to be filled with a heat transfer fluid. At least partly within the tank is a heater for heating the heat transfer fluid. The heater is arranged within the tank to be in contact with the heat transfer fluid when heat transfer fluid is in the tank. There is also a coil for transporting a process fluid to be heated wound around the heater with a gap between the coil and the heater. The coil extends between an inlet and outlet, for respectively receiving a process fluid to be heated and delivering the heated process fluid.
- the heater and the coil may be mounted to opposed ends of the tank. The heater and coil may also be mounted to plates that seal opposed ends of the tank.
- a method of heat exchange including the steps of filling a sealed tank with a heat transfer fluid, heating the heat transfer fluid with a heater, winding the coil around the heater and leaving a gap between the coil and heater, receiving a process fluid to be heated through an inlet extending from the coil, and delivering the heated process fluid through an outlet extending from the coil.
- the tank is cylindrical and has a first end at least partly supporting the heater and a second end, opposed to the first end, at least partly supporting the coil; the coil extends through the second end at two locations; the tank contains heat transfer fluid; the heat transfer fluid comprises glycol; an expansion chamber connected to or forming part of the tank for receiving expanded heat transfer fluid; the heater comprises a firetube burner; the firetube burner comprises a multi-pass firetube; a sensor on the coil; the sensor comprises a temperature sensor at one of the inlet of the coil and outlet of the coil; a structure supporting at least one of the enclosure, heater, and coil; the gap between the heater and the coil is sufficiently large to avoid corrosive electric currents passing between the coil and heater; the step of directing overflowing heat transfer fluid into an expansion chamber; the step of measuring characteristics of the process fluid as it flows through the coil.
- FIG. 1 is an exploded perspective view of a heat exchanger with a U-shaped firetube, according to one embodiment.
- FIG. 2 is a top plan cross-sectional view of the heat exchanger of FIG. 1 .
- FIG. 3 is a side elevation cross-sectional view of the heat exchanger of FIGS. 1 and 2 .
- FIG. 4 is a side view of a coil mounted to one plate, according to the heat exchanger of FIG. 1 .
- FIG. 5 is a perspective view of the plate and coil of FIG. 4
- FIG. 6 is a front elevation view of the plate and coil of FIGS. 4 and 5 .
- FIG. 7 is a top plan view of a U-shaped firetube found in the embodiment as shown in FIGS. 1-3 .
- FIG. 8 is a side elevation view of a 4-pass firetube and plate according to another embodiment.
- FIG. 9 is a front elevation view of the firetube and plate of FIG. 8 .
- heat exchanger 100 comprises a tank 102 containing a heat transfer fluid.
- Tank 102 may be cylindrically shaped or any other appropriate shape and material for containing a fluid.
- the heater is a firetube burner.
- Firetube 104 is attached to a cap 114 at one end of the tank 102 , which is sealed using fastening means.
- a flame produced by burner 124 enters the firetube 104 through firetube inlet 106 , and exhaust exits the firetube through the firetube chimney 108 .
- the firetube burner may also be comprised of a multi-pass coil to further increase heating energy while maintaining a small footprint for the system, as shown in FIGS. 8 and 9 , which comprise a 4-pass firetube 204 . It should be appreciated that while the exemplary embodiments provide a firetube type burner, other types of heaters may also be used as the heating source.
- the heat transfer fluid may be a solution of water and/or glycol.
- Glycol may be used where higher heat transfer fluid temperatures are required, and glycol may be mixed with water as a heat transfer fluid where lower freezing temperatures are required, such as in cooler climates.
- an expansion chamber 120 as shown in FIG. 1 , may be connected to or form part of the tank 102 to address the issue of expansion of the heat transfer fluid as temperature increases. Expansion chamber 120 creates additional space for expanded heat transfer fluid such as glycol so it does not exceed the maximum volume allowed by the tank 102 .
- the process fluid may be a gas such as natural gas, or any other fluid including but not limited to an explosive fluid, light oil, or liquefied natural gas.
- the system can also be used for heating and vaporizing liquefied natural gas.
- FIGS. 2-3 are cross-sectional views of the heat exchanger according to one embodiment. As shown in these figures, the coil 110 winds around the firetube 104 while leaving a gap between the coil 110 's inner radius and the surface of the firetube 104 .
- a smaller gap may result in greater heating efficiency.
- the coil 110 carrying the process fluid may be heated by the hottest part of the heat transfer fluid, i.e., the fluid closest to the firetube 104 . Heating efficiency is further increased since heat radiating from the firetube 104 is trapped by the coil 110 which forms a wall around the firetube 104 .
- the gap between the inner radius of the coil 110 and the firetube 104 should not be so small that arcing occurs between heater and coil.
- the coil 110 is supported by a plate 112 that seals one end of the tank.
- the coil extends through one end at two locations, inlet 116 and outlet 118 .
- This particular configuration makes the coil 110 , together with both inlet 116 and outlet 118 , detachable from the rest of the tank 102 .
- Both ends of the tank 102 may be sealed using bolts and nuts as shown in the figures, although other fastening means may be used.
- a sensor such as a temperature sensing means may be added to both the inlet 116 and outlet 118 of the coil 110 , to allow for accurate measurement of the process fluid temperature at both steps in the process.
- FIGS. 1-3 is supported by a support structure 122 , which is used for supporting and transporting the heat exchanger 100 .
- Exemplary methods provide a method of heat exchange, the method comprising the steps of filling a tank with a heat transfer fluid, heating the heat transfer fluid with a heater at least partly within the tank, winding a coil around the firetube with a gap between the coil and firetube, receiving a process fluid to be heated through an inlet extending from the coil, and delivering the heated process fluid through an outlet extending from the coil.
- each of the individual elements there is a 30-65,000 Btu/hr firetube within a 20′′ ⁇ 36′′ tank, with a coil with CRN approval from 20′ to 220′.
- the coil is wrapped 15′′ ID to 17′′ ID 40′ in length, with a 4′′ ⁇ 60′′ firetube delivering the volumetric requirements.
- a 3′′ firetube 60′′ in length supplies the volumetric requirements.
- the provided heat exchangers can support firetube heaters with heat transfer of up to and beyond 3 MM Btu/hr, with appropriate adjustments to the other components of the system.
- a flame arrestor for example of the crimped ribbon type, should be provide on the end of the tank to attenuate flame fronts passing through the heater. If glycol or like fluid is used for the heat transfer medium, then the glycol needs level control and an expansion chamber. The amount of heating should be regulated so that the exit process fluid temperature exceeds 5 C or other preset amount as needed for the process fluid line. Thermocouples may be used to detect the inlet and outlet process fluid temperatures, and the glycol temperature, and the heat produced by the heater adjusted accordingly.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
- Heat exchangers.
- Fluid heating systems which have a tank, a heater, a liquid medium, and a pipeline for transferring a process fluid to be heated are typically referred to as indirect heaters or indirect line heaters, since the heater does not directly heat the process fluid.
- In some line heaters using firetubes as the heat source, a pressurized coil transporting the fluid to be heated is serpentine in long lengths running from the front to back within a tank and above the firetube. The firetube is positioned below the coil in the lower arc of the tank, and the coil is in the higher arc of the tank. The area of displacement may be filled with a 50/50 glycol water solution as a heat transfer medium to absorb energy from the firetube which then transfers heat to the pressurized coil. In practice, heat from the firetube is transferred to the glycol medium, after which the energy is then transferred to the pressure coil to preheat, for example, a process fluid such as natural gas under pressure.
- There is disclosed a heat exchanger having a tank filled or to be filled with a heat transfer fluid. At least partly within the tank is a heater for heating the heat transfer fluid. The heater is arranged within the tank to be in contact with the heat transfer fluid when heat transfer fluid is in the tank. There is also a coil for transporting a process fluid to be heated wound around the heater with a gap between the coil and the heater. The coil extends between an inlet and outlet, for respectively receiving a process fluid to be heated and delivering the heated process fluid. The heater and the coil may be mounted to opposed ends of the tank. The heater and coil may also be mounted to plates that seal opposed ends of the tank.
- There is also provided a method of heat exchange, the method including the steps of filling a sealed tank with a heat transfer fluid, heating the heat transfer fluid with a heater, winding the coil around the heater and leaving a gap between the coil and heater, receiving a process fluid to be heated through an inlet extending from the coil, and delivering the heated process fluid through an outlet extending from the coil.
- In various embodiments, there may be included any one or more of the following features: the tank is cylindrical and has a first end at least partly supporting the heater and a second end, opposed to the first end, at least partly supporting the coil; the coil extends through the second end at two locations; the tank contains heat transfer fluid; the heat transfer fluid comprises glycol; an expansion chamber connected to or forming part of the tank for receiving expanded heat transfer fluid; the heater comprises a firetube burner; the firetube burner comprises a multi-pass firetube; a sensor on the coil; the sensor comprises a temperature sensor at one of the inlet of the coil and outlet of the coil; a structure supporting at least one of the enclosure, heater, and coil; the gap between the heater and the coil is sufficiently large to avoid corrosive electric currents passing between the coil and heater; the step of directing overflowing heat transfer fluid into an expansion chamber; the step of measuring characteristics of the process fluid as it flows through the coil.
- The foregoing summary is not intended to summarize each potential embodiment or every aspect of the subject matter of the present disclosure.
- These and other aspects of the device and method are set out in the claims.
- Embodiments will now be described with reference to the figures, in which like reference characters denote like elements, by way of example, and in which:
-
FIG. 1 is an exploded perspective view of a heat exchanger with a U-shaped firetube, according to one embodiment. -
FIG. 2 is a top plan cross-sectional view of the heat exchanger ofFIG. 1 . -
FIG. 3 is a side elevation cross-sectional view of the heat exchanger ofFIGS. 1 and 2 . -
FIG. 4 is a side view of a coil mounted to one plate, according to the heat exchanger ofFIG. 1 . -
FIG. 5 is a perspective view of the plate and coil ofFIG. 4 -
FIG. 6 is a front elevation view of the plate and coil ofFIGS. 4 and 5 . -
FIG. 7 is a top plan view of a U-shaped firetube found in the embodiment as shown inFIGS. 1-3 . -
FIG. 8 is a side elevation view of a 4-pass firetube and plate according to another embodiment. -
FIG. 9 is a front elevation view of the firetube and plate ofFIG. 8 . - Immaterial modifications may be made to the embodiments described here without departing from what is covered by the claims.
- In one particular embodiment as illustrated in
FIG. 1 ,heat exchanger 100 comprises atank 102 containing a heat transfer fluid.Tank 102 may be cylindrically shaped or any other appropriate shape and material for containing a fluid. - There is a heater at the one end of the tank for heating the heat transfer fluid. In this particular embodiment, the heater is a firetube burner. Firetube 104 is attached to a
cap 114 at one end of thetank 102, which is sealed using fastening means. A flame produced by burner 124 enters thefiretube 104 throughfiretube inlet 106, and exhaust exits the firetube through thefiretube chimney 108. In addition to the U-shapedfiretube 104 as shown inFIGS. 1-3 and 7 , the firetube burner may also be comprised of a multi-pass coil to further increase heating energy while maintaining a small footprint for the system, as shown inFIGS. 8 and 9 , which comprise a 4-pass firetube 204. It should be appreciated that while the exemplary embodiments provide a firetube type burner, other types of heaters may also be used as the heating source. - For natural gas heating systems, the heat transfer fluid may be a solution of water and/or glycol. Glycol may be used where higher heat transfer fluid temperatures are required, and glycol may be mixed with water as a heat transfer fluid where lower freezing temperatures are required, such as in cooler climates. In addition, an
expansion chamber 120, as shown inFIG. 1 , may be connected to or form part of thetank 102 to address the issue of expansion of the heat transfer fluid as temperature increases.Expansion chamber 120 creates additional space for expanded heat transfer fluid such as glycol so it does not exceed the maximum volume allowed by thetank 102. - Also provided within the heat exchanger is a
coil 110 for transporting a process fluid to be heated. The process fluid may be a gas such as natural gas, or any other fluid including but not limited to an explosive fluid, light oil, or liquefied natural gas. The system can also be used for heating and vaporizing liquefied natural gas. - As shown in
FIGS. 1-3 , thecoil 110 is arranged such that it is wound around thefiretube 104 but does not make contact with the firetube, leaving a gap between thecoil 110 and thefiretube 104. The gap should be minimized to enhance heat transfer but should be sufficiently large to avoid corrosive electric currents passing between heater and coil.FIGS. 2-3 are cross-sectional views of the heat exchanger according to one embodiment. As shown in these figures, thecoil 110 winds around thefiretube 104 while leaving a gap between thecoil 110's inner radius and the surface of thefiretube 104. - A smaller gap may result in greater heating efficiency. The
coil 110 carrying the process fluid may be heated by the hottest part of the heat transfer fluid, i.e., the fluid closest to thefiretube 104. Heating efficiency is further increased since heat radiating from thefiretube 104 is trapped by thecoil 110 which forms a wall around thefiretube 104. However, the gap between the inner radius of thecoil 110 and thefiretube 104 should not be so small that arcing occurs between heater and coil. - By having a coil wrapped around a heater, a small footprint of the heat exchanger may be obtained.
- According to the specific embodiment found in
FIG. 1 and as shown in greater detail inFIGS. 4-6 , thecoil 110 is supported by aplate 112 that seals one end of the tank. In this particular embodiment, the coil extends through one end at two locations,inlet 116 andoutlet 118. This particular configuration makes thecoil 110, together with bothinlet 116 andoutlet 118, detachable from the rest of thetank 102. Both ends of thetank 102 may be sealed using bolts and nuts as shown in the figures, although other fastening means may be used. Furthermore, a sensor, such as a temperature sensing means may be added to both theinlet 116 andoutlet 118 of thecoil 110, to allow for accurate measurement of the process fluid temperature at both steps in the process. - This particular design allows for simpler manufacture and assembly, and also allows the heat exchanger to be more easily maintained, due to the fact that the tank, the heater and coil can all be separately manufactured, cleaned and repaired. However, it should be appreciated that alternative designs could be made without departing from the scope of the claims, for example, where the heater and coil do not necessarily form part of the plate, or any other arrangement where the
coil 110 wraps around thefiretube 104. - Although not required, the embodiment as shown in
FIGS. 1-3 is supported by asupport structure 122, which is used for supporting and transporting theheat exchanger 100. - Exemplary methods provide a method of heat exchange, the method comprising the steps of filling a tank with a heat transfer fluid, heating the heat transfer fluid with a heater at least partly within the tank, winding a coil around the firetube with a gap between the coil and firetube, receiving a process fluid to be heated through an inlet extending from the coil, and delivering the heated process fluid through an outlet extending from the coil.
- It will be apparent that various other changes and modifications can be made without departing from the scope of in the claims. For example, the particular dimensions and characteristics of each of the individual elements may be varied. According to one embodiment, there is a 30-65,000 Btu/hr firetube within a 20″×36″ tank, with a coil with CRN approval from 20′ to 220′. In this particular embodiment, the coil is wrapped 15″ ID to 17″ ID 40′ in length, with a 4″×60″ firetube delivering the volumetric requirements. There may also be a 18-30,000 Btu/hr unit with a 16″×36″ tank and a 1″ wrapped 12″ ID 13½″ OD and 20′ of coil to deliver the heat transfer needed. Based on this particular embodiment, a 3″
firetube 60″ in length supplies the volumetric requirements. The provided heat exchangers can support firetube heaters with heat transfer of up to and beyond 3 MM Btu/hr, with appropriate adjustments to the other components of the system. - Standard safety procedures should be followed. A flame arrestor, for example of the crimped ribbon type, should be provide on the end of the tank to attenuate flame fronts passing through the heater. If glycol or like fluid is used for the heat transfer medium, then the glycol needs level control and an expansion chamber. The amount of heating should be regulated so that the exit process fluid temperature exceeds 5 C or other preset amount as needed for the process fluid line. Thermocouples may be used to detect the inlet and outlet process fluid temperatures, and the glycol temperature, and the heat produced by the heater adjusted accordingly.
- In the claims, the word “comprising” is used in its inclusive sense and does not exclude other elements being present. The indefinite articles “a” and “an” before a claim feature do not exclude more than one of the feature being present. Each one of the individual features described here may be used in one or more embodiments and is not, by virtue only of being described here, to be construed as essential to all embodiments as defined by the claims.
Claims (15)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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CA3007557A CA3007557A1 (en) | 2018-06-07 | 2018-06-07 | Heat exchanger and method |
CA3007557 | 2018-06-07 |
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US20190376726A1 true US20190376726A1 (en) | 2019-12-12 |
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US16/414,583 Abandoned US20190376726A1 (en) | 2018-06-07 | 2019-05-16 | Heat exchanger and method |
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CA (1) | CA3007557A1 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130340985A1 (en) * | 2012-06-26 | 2013-12-26 | Junhyeon Hwang | Heat exchanger |
-
2018
- 2018-06-07 CA CA3007557A patent/CA3007557A1/en active Pending
-
2019
- 2019-05-16 US US16/414,583 patent/US20190376726A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130340985A1 (en) * | 2012-06-26 | 2013-12-26 | Junhyeon Hwang | Heat exchanger |
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