CN112113195B - Apparatus and method for heating molten salt - Google Patents
Apparatus and method for heating molten salt Download PDFInfo
- Publication number
- CN112113195B CN112113195B CN202010849677.8A CN202010849677A CN112113195B CN 112113195 B CN112113195 B CN 112113195B CN 202010849677 A CN202010849677 A CN 202010849677A CN 112113195 B CN112113195 B CN 112113195B
- Authority
- CN
- China
- Prior art keywords
- molten salt
- electrode
- insulating
- storage tank
- heating
- 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.)
- Active
Links
- 150000003839 salts Chemical class 0.000 title claims abstract description 382
- 238000010438 heat treatment Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000003860 storage Methods 0.000 claims abstract description 77
- 238000005086 pumping Methods 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims description 38
- 238000004891 communication Methods 0.000 claims description 26
- 239000012530 fluid Substances 0.000 claims description 26
- 230000009969 flowable effect Effects 0.000 claims description 7
- 238000005260 corrosion Methods 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 abstract description 2
- 238000005485 electric heating Methods 0.000 description 10
- 239000010416 ion conductor Substances 0.000 description 4
- 238000005338 heat storage Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/06—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being molten; Use of molten metal, e.g. zinc, as heat transfer medium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
-
- 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
- F24H7/002—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release using electrical energy supply
-
- 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
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
-
- 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
-
- 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
- H05B3/02—Details
- H05B3/03—Electrodes
-
- 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
- F28D2020/0047—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 using molten salts or liquid metals
-
- 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
Landscapes
- 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)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Electrolytic Production Of Metals (AREA)
- Resistance Heating (AREA)
Abstract
The present invention relates to an apparatus and method for heating molten salt. The device comprises: a first molten salt storage tank; a second molten salt storage tank; at least one group of molten salt electrodes, each group of molten salt electrodes comprising a plurality of molten salt electrode boxes; at least one set of electrode-entering insulating pipelines; at least one set of outgoing electrode insulation pipes; at least one first connecting duct; at least one second connecting duct; at least one first molten salt circulating pump which is arranged in the corresponding first connecting pipeline and is used for pumping the molten salt in the first molten salt storage tank to the molten salt electrode box; and a power supply device including a plurality of alternating-current power and having the same number of phases as the plurality of molten salt electrode boxes, each phase of the alternating-current power of the power supply device being electrically connected to a corresponding one of the plurality of molten salt electrode boxes.
Description
Technical Field
The present invention relates to the field of molten salt heating, and more particularly to an apparatus and method for heating molten salt using an electrode.
Background
The molten salt is a heat transfer and heat storage medium with excellent fluidity, has the characteristics of low vapor pressure, wide applicable temperature range, stable chemical property, large heat capacity, no combustion, low price, easy preparation and the like, and has wide application prospect in the heat storage field, in particular to the middle and high temperature heat storage field.
At present, the electric heating of molten salt mostly adopts an indirect heating mode of an electric heating rod through heat conduction, the service life of the electric heating wire is shorter as the working temperature of the electric heating wire is higher, and the heat transfer is worse as the insulation between the electric heating wire and the outer sleeve is better, so that the electric heating device is not beneficial to being applied to the high-temperature high-power electric heating of molten salt.
The electrode type heating method is that the current directly passes through the molten salt to generate heat, the molten salt is a heating body, and the problem caused by indirect heating does not exist, but the current density on the surface of an electrode cannot be controlled in a reasonable range by the conventional electrode heating technical means because the molten salt has high conductivity, so that corrosion of electrode materials and electrolysis of the molten salt are difficult to avoid.
The information disclosed in the background section of the invention is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
It is an object of the present invention to provide an apparatus and method for heating molten salt using an electrode. The invention can successfully solve the technical problem of realizing the low-current density operation of the electrode in various ion conductors under any voltage, is not only suitable for molten salt electrode type heating, but also suitable for electrode type heating of other ion conductors with fluidity, and can be used for designing and manufacturing molten salt electric heating equipment with various power values suitable for various voltage ranges.
To achieve the above object, the present invention provides an apparatus for heating molten salt, comprising: a first molten salt storage tank; a second molten salt storage tank; at least one group of molten salt electrodes, each group of molten salt electrodes comprising a plurality of molten salt electrode boxes; at least one set of electrode-entering insulating pipes, the number of pipes in each set of electrode-entering insulating pipes being the same as the number of the plurality of molten salt electrode boxes in each set of molten salt electrodes, a first end of the electrode-entering insulating pipe being fluidly connected to a corresponding one of the plurality of molten salt electrode boxes, a second end of the electrode-entering insulating pipe being fluidly connected to the first connecting pipe so that molten salt can flow through the electrode-entering insulating pipe; at least one set of outlet electrode insulating pipes, the number of pipes in each set of outlet electrode insulating pipes being the same as the number of the plurality of molten salt electrode boxes in each set of molten salt electrodes, a first end of the outlet electrode insulating pipe being fluidly connected to a corresponding one of the plurality of molten salt electrode boxes, a second end of the outlet electrode insulating pipe being fluidly connected to a second connecting pipe so that molten salt can flow through the outlet electrode insulating pipe; at least one first connecting conduit having a number equal to the number of sets of electrode-entering insulating conduits, a first end of the first connecting conduit being in fluid communication with the first molten salt reservoir and a second end of the first connecting conduit being in fluid communication with a second end of a corresponding set of electrode-entering insulating conduits; at least one second connecting tube, the number of second connecting tubes being equal to the number of groups of outlet electrode insulating tubes, the first ends of the second connecting tubes being in fluid communication with the second molten salt reservoir, the second ends of the second connecting tubes being in fluid communication with the second ends of a respective group of outlet electrode insulating tubes; at least one first molten salt circulation pump provided in the corresponding first connection pipe and configured to pump molten salt in the first molten salt storage tank to the molten salt electrode tank; and a power supply device including a plurality of alternating-current power and having the same number of phases as the plurality of molten salt electrode boxes, each phase of the alternating-current power of the power supply device being electrically connected to a corresponding one of the plurality of molten salt electrode boxes.
In the above-mentioned apparatus for heating molten salt, the plurality of molten salt electrode boxes of each group of molten salt electrodes are three, the multiphase alternating current is a three-phase alternating current, each group of electrode-in insulating pipes includes three electrode-in insulating pipes, and each group of electrode-out insulating pipes includes three electrode-out insulating pipes.
In the above-described apparatus for heating molten salt, the molten salt flowing in each of the electrode-entering insulating pipes of each set generates a first resistance value resistor having the same resistance value, and the molten salt flowing in each of the electrode-exiting insulating pipes of each set generates a second resistance value resistor having the same resistance value.
Further, the first resistance value and the second resistance value are also the same.
In the above-described apparatus for heating molten salt, the electrode-entering insulating pipes are horizontally arranged, the lengths of the respective pipes in each group of electrode-entering insulating pipes are the same, and the flow cross-sectional areas of the respective pipes in each group of electrode-entering insulating pipes are the same, so as to ensure that the flow rates of the respective pipes in each group of electrode-entering insulating pipes are the same; the outlet electrode insulating pipelines are horizontally arranged, the lengths of the pipelines in each group of outlet electrode insulating pipelines are the same, and the flow cross sections of the pipelines in each group of outlet electrode insulating pipelines are the same, so that the flow rates of the pipelines in each group of outlet electrode insulating pipelines are the same.
In the above-mentioned apparatus for heating molten salt, the molten salt electrode tank is made of a corrosion-resistant, high-temperature-resistant metal material to have a container with a specific inner surface area, and has an electrode-in insulating pipe connection port and an electrode-out insulating pipe connection port, the first end of the electrode-in insulating pipe being fluidly connected to the electrode-in insulating pipe connection port of the corresponding molten salt electrode tank, and the first end of the electrode-out insulating pipe being fluidly connected to the electrode-out insulating pipe connection port of the corresponding molten salt electrode tank; and the outer wall of the molten salt electrode box is connected with a conductive copper bar.
The apparatus for heating molten salt according to the present invention is further provided with: a loop conduit having a first end fluidly connected to the first molten salt storage tank and a second end fluidly connected to the second molten salt storage tank to enable molten salt to flow through the loop conduit; and molten salt return pumps provided in the respective loop pipes for pumping the molten salt in the second molten salt storage tank to the first molten salt storage tank.
The apparatus for heating molten salt according to the present invention is further provided with: at least one first preheater provided in the first molten salt storage tank for heating the salt in the first molten salt storage tank; at least one second preheater disposed in the second molten salt storage tank for heating the salt in the second molten salt storage tank; a liquid level sensor disposed in the first molten salt storage tank for measuring a liquid level height in the first molten salt storage tank; and a controller electrically connected to the first pre-heater, the second pre-heater, the power supply device, the first molten salt circulating pump, the molten salt return pump and the liquid level sensor to control on or off of the first pre-heater and the second pre-heater, power supply or power off of the power supply device, rotational speeds of the first molten salt circulating pump and the molten salt return pump, and to receive a sensing signal of the liquid level sensor to control the rotational speed of the molten salt pump according to a liquid level height in the first molten salt storage tank.
The apparatus for heating molten salt according to the present invention is further provided with: at least one second molten salt circulation pump provided in the corresponding second connection pipe for pumping the molten salt in the molten salt electrode tank to the second molten salt storage tank; wherein the controller is further electrically connected to the second molten salt circulation pump to control the rotational speed of the second molten salt circulation pump.
The invention further provides a method for heating molten salt using an apparatus for heating molten salt according to the above, the method comprising the steps of: heating the salts in the first molten salt storage tank and the second molten salt storage tank by using a first preheater and a second preheater respectively, and heating the salts in the first molten salt storage tank and the second molten salt storage tank to a flowable molten state; after the salt is in a flowable molten state, the first preheater and the second preheater are turned off; pumping molten salt in a first molten salt storage tank to a molten salt electrode box through a first connecting pipeline and an electrode feeding insulating pipeline by using a first molten salt circulating pump; flowing molten salt in the molten salt electrode box to a second molten salt storage tank through an electrode outlet insulating pipeline and a second connecting pipeline; when the molten salt in the molten salt electrode box reaches the preset liquid level, a power supply device is started to supply power, so that the molten salt is heated.
By the various exemplary embodiments described above, the advantages of utilizing the present invention are: the insulating pipeline and the molten salt electrode can be designed according to any power supply voltage and heating power to form a suitable molten salt heating device. The electrode type molten salt heating device and method provided by the invention adopt molten salt as a heating body, have no heat conduction loss and no risk of dry heating of an electric heating wire, and the only moving parts are the first molten salt circulating pump, the second molten salt circulating pump and the molten salt return pump, so that once molten salt is not heated in the molten salt electrode, the molten salt heating is stopped. Most importantly, the invention successfully solves the technical problem of realizing the low current density operation of the electrode in various high-conductivity ion conductors under any operating voltage.
Drawings
Fig. 1 is a schematic view of an apparatus for heating molten salt according to an exemplary embodiment of the invention.
It should be understood that the drawings are not to scale but rather illustrate various features that are somewhat simplified in order to explain the basic principles of the invention. In the drawings of the present invention, like reference numerals designate like or equivalent parts of the present invention.
Detailed Description
Reference will now be made in detail to various embodiments of the invention, examples of which are illustrated in the accompanying drawings and described below. While the invention will be described in conjunction with the exemplary embodiments thereof, it will be understood that the present description is not intended to limit the invention to those exemplary embodiments. On the contrary, the invention is intended to cover not only the exemplary embodiments of the invention, but also various alternatives, modifications, equivalents, and other embodiments, which are included within the spirit and scope of the invention as defined by the appended claims.
Hereinafter, various exemplary embodiments of the present invention will be described more specifically with reference to the accompanying drawings.
Fig. 1 shows an apparatus 100 for heating molten salt according to an exemplary embodiment of the invention, which may include:
A first molten salt storage tank 10 made of a high temperature and corrosion resistant material and grounded, at least one first preheater 11 being provided inside the first molten salt storage tank 10;
A second molten salt storage tank 20 made of a high temperature and corrosion resistant material and grounded, at least one second preheater 12 being provided inside the second molten salt storage tank 20;
at least one set of molten salt electrodes 30, each set of molten salt electrodes 30 comprising a plurality of molten salt electrode boxes;
At least one set of electrode-entering insulating pipes 40, the number of pipes in each set of electrode-entering insulating pipes being the same as the number of the plurality of molten salt electrode boxes in each set of molten salt electrodes, a first end of the electrode-entering insulating pipe 40 being in fluid communication with a respective one of the plurality of molten salt electrode boxes, a second end of the electrode-entering insulating pipe 40 being in fluid communication with the first connecting pipe 13 so that molten salt can flow through the electrode-entering insulating pipe 40;
at least one set of outlet electrode insulating pipes 50, the number of pipes in each set of outlet electrode insulating pipes being the same as the number of the plurality of molten salt electrode boxes in each set of molten salt electrodes, a first end of the outlet electrode insulating pipe 50 being fluidly connected to a respective one of the plurality of molten salt electrode boxes, a second end of the outlet electrode insulating pipe 50 being fluidly connected to the second connecting pipe 14 such that molten salt can flow through the outlet electrode insulating pipe 50;
At least one first connection pipe 13, the number of first connection pipes 13 being equal to the number of groups of electrode-entering insulating pipes 40, a first end of the first connection pipe 13 being in fluid communication with the first molten salt storage tank 10, a second end of the first connection pipe 13 being in fluid communication with a second end of a respective group of electrode-entering insulating pipes 40;
At least one second connecting conduit 14, the number of second connecting conduits 14 being equal to the number of groups of outlet electrode insulating conduits 50, the first ends of the second connecting conduits 14 being in fluid communication with the second molten salt reservoir 20, the second ends of the second connecting conduits 14 being in fluid communication with the second ends of a respective group of outlet electrode insulating conduits 50;
At least one first molten salt circulation pump 16 provided in the respective first connection pipes 13 for pumping molten salt in the first molten salt storage tank 10 to the molten salt electrode 30;
a power supply device 60 including a plurality of alternating-current power and having the same number of phases as the plurality of molten salt electrode boxes, each phase of the alternating-current power of the power supply device 60 being electrically connected to a corresponding one of the plurality of molten salt electrode boxes;
a loop conduit 15, a first end of the loop conduit 15 being in fluid communication with the first molten salt storage tank 10, a second end of the loop conduit 15 being in fluid communication with the second molten salt storage tank 20 to enable molten salt to flow through the loop conduit 15;
molten salt return pumps 18 provided in the respective loop pipes 15 for pumping the molten salt in the second molten salt storage tank 20 to the first molten salt storage tank 10;
at least one first preheater 11 provided in the first molten salt tank 10 for heating the salt in the first molten salt tank 10;
at least one second preheater 12 provided in said second molten salt storage tank 20 for heating the salt in the second molten salt storage tank 20;
A liquid level sensor (not shown) provided in the first molten salt tank 10 for measuring a liquid level height in the first molten salt tank 10;
At least one second molten salt circulation pump 17 provided in the respective second connection pipes 14 for pumping the molten salt in the molten salt electrode 30 to the second molten salt storage tank 20; and
A controller 70 electrically connected to the first preheater 11, the second preheater 12, the power supply device 60, the first molten salt circulation pump 16, the second molten salt circulation pump 17, the molten salt return pump 18, and the liquid level sensor to control on or off of the first and second preheaters 11 and 12, power supply or off of the power supply device 60, on or off of the first and second molten salt circulation pumps 16 and 17, and to receive a sensing signal of the liquid level sensor to control a rotational speed of the molten salt pump including the first and/or second molten salt circulation pumps 16 and 17 and/or the molten salt return pump 18 according to a liquid level height in the first molten salt storage tank 10.
Specifically, in the present exemplary embodiment, the plurality of molten salt electrode boxes of each set of molten salt electrodes 30 are three (denoted by reference numerals 31, 32, 33, respectively, in fig. 1), the multi-phase alternating current is a three-phase alternating current (denoted by reference numerals L1, L2, L3), each set of electrode-entering insulating pipes 40 includes three electrode-entering insulating pipes (denoted by reference numerals 41, 42, 43, respectively, in fig. 1), and each set of electrode-exiting insulating pipes 50 includes three electrode-exiting insulating pipes (denoted by reference numerals 51, 52, 53, respectively, in fig. 1). Specifically, each phase L1, L2, L3 of the three-phase alternating current is electrically connected to three molten salt electrode boxes 31, 32, 33, respectively. It will be appreciated by those skilled in the art that three-phase alternating current is merely an example, and that more or fewer phases of alternating current are possible, such as two-phase alternating current.
In the embodiment shown in fig. 1, only one set of molten salt electrodes 30 is shown, but it will be understood by those skilled in the art that two, three or more sets of molten salt electrodes 30 may be provided, and that each set of molten salt electrodes 30 includes a plurality of molten salt electrode tanks (illustrated as each set of molten salt electrodes 30 including three molten salt electrode tanks 31, 32, 33). Accordingly, taking three-phase alternating current as an example, in the case of including three sets of the molten salt electrodes 30, the L1 phases of the three-phase alternating current are electrically connected to the first molten salt electrode boxes 31 of each set of the molten salt electrodes 30, the L2 phases of the three-phase alternating current are electrically connected to the second molten salt electrode boxes 32 of each set of the molten salt electrodes 30, and the L3 phases of the three-phase alternating current are electrically connected to the third molten salt electrode boxes 33 of each set of the molten salt electrodes 30, respectively. Further, fig. 1 shows only one set of the electrode-in insulating ducts 40 and one set of the electrode-out insulating ducts 50, that is, one set of the electrode-in insulating ducts 40 and one set of the electrode-out insulating ducts 50 are provided for one set of the molten salt electrodes 30. It will be appreciated by those skilled in the art that two or more sets of juxtaposed inlet electrode insulating ducts 40 and two or more sets of juxtaposed outlet electrode insulating ducts 50 may be provided for a set of molten salt electrodes 30, as desired.
Specifically, in the present exemplary embodiment, the molten salt flowing in each of the sets of electrode-entering insulating pipes 40 generates the same resistance value of the first resistance value resistance, that is, the resistance values generated by the molten salt flowing in each of the electrode-entering insulating pipes 41, 42, 43 are the same as each other. And, the molten salt flowing in each of the discharge electrode insulating pipes 50 of each group generates a second resistance value resistance having the same resistance value, that is, the resistance values generated by the molten salt flowing in each of the discharge electrode insulating pipes 51, 52, 53 are the same as each other.
In order to make the resistance values generated by the molten salt flowing in the respective electrode-feeding insulating pipes 41, 42, 43 identical to each other, the electrode-feeding insulating pipes may have a circular, oval, rectangular, hexagonal or other closed cross section, each insulating pipe is a complete pipe or is formed by combining a plurality of sections of short pipes, each group of electrode-feeding insulating pipes has the same flow cross section and the same length, so that the same resistance value is ensured after each pipe of each group of electrode-feeding insulating pipes is filled with molten salt liquid. Further, the electrode inlet insulating pipeline is horizontally arranged.
Similarly, in order to make the resistance values generated by the molten salt flowing in the respective electrode outlet insulating pipes 51, 52, 53 identical to each other, the electrode outlet insulating pipes may have a circular, oval, rectangular, hexagonal or other closed-shaped cross section, each insulating pipe is a complete pipe or is formed by combining short sections, and each group of electrode outlet insulating pipes has the same flow cross section and the same length, so that the same resistance value is ensured after each pipe of each group of electrode outlet insulating pipes is filled with the molten salt liquid. Further, the electrode outlet insulating pipeline is horizontally arranged.
In a preferred embodiment, the first resistance value and the second resistance value are also the same. That is, the resistance value generated by the molten salt flowing in each of the electrode-entering insulating pipes 41, 42, 43 and the resistance value generated by the molten salt flowing in each of the electrode-exiting insulating pipes 51, 52, 53 are also the same as each other.
In an exemplary embodiment of the invention, the fused salt electrode tanks 31, 32, 33 are vessels of a specific internal surface area made of a corrosion-resistant, high temperature-resistant metallic material and have an inlet electrode insulated conduit connection port, a first end of which is in fluid communication with the inlet electrode insulated conduit connection port of the respective fused salt electrode tank, and an outlet electrode insulated conduit connection port, a first end of which is in fluid communication with the outlet electrode insulated conduit connection port of the respective fused salt electrode tank. Further, an outer wall of the molten salt electrode box is connected with a conductive copper bar (not shown).
Further, in the present exemplary embodiment, a liquid level sensor (not shown) is provided inside the first molten salt tank 10. The controller 70 is electrically connected to the liquid level sensor to receive a sensing signal of the liquid level sensor, and when the liquid level in the first molten salt storage tank 10 sensed by the liquid level sensor is lower than or equal to the first liquid level, the controller 70 controls the first molten salt circulation pump 16 to slow down or stop working, and increases the rotational speed of the molten salt return pump 18 so that the liquid level in the first molten salt storage tank 10 increases; when the liquid level in the first molten salt storage tank 10 sensed by the liquid level sensor is higher than or equal to the second liquid level, the controller 70 restarts the first molten salt circulation pump 16 and reduces the rotational speed of the molten salt return pump 18 to the rotational speed before the rotational speed is increased.
Hereinafter, a method for heating molten salt using the above-described apparatus for heating molten salt is specifically described, the method comprising the steps of: heating the salts in the first molten salt tank 10 and the second molten salt tank 20 using the first preheater 11 and the second preheater 12, respectively, and heating both the salts in the first molten salt tank 10 and the second molten salt tank 20 to a flowable molten state; after the salt is in a flowable molten state, the first preheater 11 and the second preheater 12 are turned off; pumping molten salt in the first molten salt storage tank 10 to the molten salt electrode tank 30 through the first connecting pipe 13 and the electrode-feeding insulating pipe 40 using the first molten salt circulating pump 16; flowing molten salt in the molten salt electrode tank 30 to the second molten salt storage tank 20 through the electrode outlet insulating pipe 50 and the second connecting pipe 14; when the molten salt in the molten salt electrode box 30 reaches a predetermined liquid level, the power supply device 60 is turned on to supply power, thereby heating the molten salt.
By the above-described method of heating molten salt, molten salt is pumped from the first molten salt storage tank 10 to the molten salt electrode tank 30 via the first connecting pipe 13 and the electrode-feeding insulating pipe 40, then molten salt in the molten salt electrode tank 30 flows to the second molten salt storage tank 20 via the electrode-discharging insulating pipe 50 and the second connecting pipe 14, and then molten salt in the second molten salt storage tank 20 is pumped to the first molten salt storage tank 10 via the loop pipe 15, whereby a cycle is formed. At the same time as the above cycle, the power supply device 60 is turned on to supply power, so that the molten salt is heated.
By the above-described method of heating molten salt, after the power supply device 60 is turned on to heat the molten salt, the second molten salt circulation pump 17 is turned on, and the rotational speed of the second molten salt circulation pump 17 is controlled to be the same as that of the first molten salt circulation pump 16, so that the amount of molten salt pumped into the molten salt electrode box 30 through the electrode-entering insulating pipe 40 is equal to the amount of molten salt flowing out of the molten salt electrode box 30 through the electrode-exiting insulating pipe 50.
In the invention, three-phase alternating current is taken as an example, and electrodes are used for heating molten salt, which corresponds to a star connection method using the three-phase alternating current. The star connection method is that the neutral line is not connected, the current can flow between the phase lines, if the three-phase loads are the same, the vector sum of the three-phase currents is zero, and thus the neutral line current is zero. Therefore, the electrodes can heat the molten salt as long as the balance among the electrodes is ensured, namely the flow rate and the flow velocity of the molten salt flowing through the electrodes are the same, and the sizes of the electrodes are the same.
In an exemplary embodiment of the present invention, when heated by the first and second pre-heaters 11 and 12, the salt may be heated to 200-275 ℃ to make the salt in a flowable molten state, thereby enabling the above-described cycle; further, after turning on the power supply device 60, the molten salt may be heated to 300-600 ℃, even up to 800 ℃.
In the preferred embodiment of the present invention, the molten salt electrode 30 is connected to a three-phase alternating current, the molten salt is heated in the above-described cycle, the heated high-temperature molten salt flows into the second molten salt storage tank 20, the molten salt is pumped from the second molten salt storage tank 20 to the first molten salt storage tank 10 by the molten salt return pump 18 to be continuously circulated, and the molten salt simultaneously takes heat out in the circulation process.
The molten salt heated by the present invention can be applied to: the heat exchanger is used for providing industrial high-temperature steam at different temperatures, so that the high-temperature steam can be directly provided for a power plant steam turbine, and the steam at different temperatures can also be provided for brewing, pharmacy, mining industry and the like. Further, the invention can utilize peak shaving power of the power plant to convert the power into heat for storage or use. The invention can also directly utilize the electric power generated by the abandoned clean energy to directly convert into heat for storage or directly use.
In an exemplary embodiment of the present invention, according to the above-described method for heating molten salt, when the liquid level in the first molten salt storage tank 10 sensed by the liquid level sensor is lower than or equal to the first liquid level, the controller 70 controls the first molten salt circulation pump 16 to slow down or stop operating, and increases the rotational speed of the molten salt return pump 18 so that the liquid level in the first molten salt storage tank 10 increases; when the liquid level in the first molten salt storage tank 10 sensed by the liquid level sensor is higher than or equal to the second liquid level, the controller 70 restarts the first molten salt circulation pump 16 and reduces the rotational speed of the molten salt return pump 18 to the rotational speed before the rotational speed is increased.
In the exemplary embodiment of the present invention, according to the above-described method for heating molten salt, when the heating is to be ended, the controller may first control the first molten salt circulation pump 16 to stop operating so that molten salt no longer enters the molten salt electrode 30 through the electrode-entering insulating pipe 40, so that the liquid level in the molten salt electrode 30 may gradually decrease, and then control the rotation speed of the second molten salt circulation pump 17 to gradually decrease until stopping, and after the molten salt in the molten salt electrode 30 flows into the second molten salt storage tank 20 through the electrode-exiting insulating pipe 50 and the second connecting pipe 14, the heating is stopped.
By the various exemplary embodiments described above, the advantages of utilizing the present invention are: the insulating pipeline and the molten salt electrode can be designed according to any power supply voltage and heating power to form a suitable molten salt heating device. The electrode type molten salt heating device and method provided by the invention adopt molten salt as a heating body, no heat conduction loss and no risk of dry heating of an electric heating wire are caused, and the only moving part is a molten salt pump (comprising a first molten salt circulating pump 16 and/or a second molten salt circulating pump 17 and/or a molten salt return pump 18), so that once molten salt is not heated in a molten salt electrode, the molten salt is stopped. Most importantly, the invention successfully solves the technical problem of realizing the low current density operation of the electrode in various high-conductivity ion conductors under any operating voltage.
Finally, in order to more clearly illustrate the invention, applicant has described the following in connection with examples. The invention relates to a size design of an insulating tube, which is characterized in that molten salt flowing through the insulating tube is regarded as a cylindrical resistor, the resistance value of the molten salt is R=ρ L/S, wherein R is the resistance value of the cylindrical resistor, ρ is the conductivity of the molten salt, L is the length of the insulating tube, S is the inner diameter area of the cross section of the insulating tube, and when L/S reaches a certain value, the resistance of the molten salt flowing through the insulating tube can be large, so that the molten salt current is small after the molten salt passes through the insulating tube.
The foregoing description of specific exemplary embodiments of the invention has been presented for the purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to thereby enable others skilled in the art to make and utilize various exemplary embodiments and various alternatives and modifications thereof. It is intended that the scope of the invention be defined by the following claims and their equivalents.
Claims (6)
1. An apparatus for heating molten salt, comprising:
A first molten salt storage tank;
A second molten salt storage tank;
at least one group of molten salt electrodes, each group of molten salt electrodes comprising a plurality of molten salt electrode boxes;
At least one set of electrode-entering insulating pipes, the number of pipes in each set of electrode-entering insulating pipes being the same as the number of the plurality of molten salt electrode boxes in each set of molten salt electrodes, a first end of the electrode-entering insulating pipe being in fluid communication with a respective one of the plurality of molten salt electrode boxes, a second end of the electrode-entering insulating pipe being in fluid communication with a first connecting pipe so that molten salt can flow through the electrode-entering insulating pipe;
At least one set of outlet electrode insulating pipes, the number of pipes in each set of outlet electrode insulating pipes being the same as the number of the plurality of molten salt electrode boxes in each set of molten salt electrodes, a first end of the outlet electrode insulating pipe being in fluid communication with a respective one of the plurality of molten salt electrode boxes, a second end of the outlet electrode insulating pipe being in fluid communication with a second connecting pipe to enable molten salt to flow through the outlet electrode insulating pipe;
at least one first connecting conduit, the number of first connecting conduits being equal to the number of sets of electrode-entering insulating conduits, a first end of the first connecting conduit being in fluid communication with the first molten salt reservoir, a second end of the first connecting conduit being in fluid communication with a second end of a corresponding set of electrode-entering insulating conduits;
at least one second connecting conduit, the number of second connecting conduits being equal to the number of groups of outlet electrode insulating conduits, the first ends of the second connecting conduits being in fluid communication with the second molten salt reservoir, the second ends of the second connecting conduits being in fluid communication with the second ends of a respective group of outlet electrode insulating conduits;
at least one first molten salt circulation pump provided in the corresponding first connection pipe and configured to pump molten salt in the first molten salt storage tank to the molten salt electrode tank; and
A power supply device including a plurality of alternating-current power and having the same number of phases as the plurality of molten salt electrode boxes, each phase of the alternating-current power of the power supply device being electrically connected to a corresponding one of the plurality of molten salt electrode boxes;
The electrode inlet insulating pipelines are horizontally arranged, the lengths of the pipelines in each group of electrode inlet insulating pipelines are the same, and the flow cross sections of the pipelines in each group of electrode inlet insulating pipelines are the same, so that the flow rates of the pipelines in each group of electrode inlet insulating pipelines are the same;
The outlet electrode insulating pipelines are horizontally arranged, the lengths of the pipelines in each group of outlet electrode insulating pipelines are the same, and the flow cross sections of the pipelines in each group of outlet electrode insulating pipelines are the same, so that the flow rates of the pipelines in each group of outlet electrode insulating pipelines are the same;
The molten salt electrode box is made of a corrosion-resistant and high-temperature-resistant metal material, is provided with an electrode inlet insulating pipeline connecting port and an electrode outlet insulating pipeline connecting port, wherein the first end of the electrode inlet insulating pipeline is in fluid communication with the electrode inlet insulating pipeline connecting port of the corresponding molten salt electrode box, and the first end of the electrode outlet insulating pipeline is in fluid communication with the electrode outlet insulating pipeline connecting port of the corresponding molten salt electrode box; the outer wall of the molten salt electrode box is connected with a conductive copper bar;
the apparatus for heating molten salt further comprises:
A loop conduit having a first end in fluid communication with a first molten salt storage tank and a second end in fluid communication with a second molten salt storage tank to enable molten salt to flow through the loop conduit;
molten salt return pumps provided in the respective loop pipes for pumping the molten salt in the second molten salt storage tank to the first molten salt storage tank;
At least one first preheater provided in the first molten salt storage tank for heating the salt in the first molten salt storage tank;
At least one second preheater provided in the second molten salt storage tank for heating the salt in the second molten salt storage tank;
a liquid level sensor disposed in the first molten salt storage tank for measuring a liquid level height in the first molten salt storage tank; and
And a controller electrically connected to the first pre-heater, the second pre-heater, the power supply device, the first molten salt circulating pump, the molten salt return pump, and the liquid level sensor to control on or off of the first pre-heater and the second pre-heater, power supply or power off of the power supply device, rotational speeds of the first molten salt circulating pump and the molten salt return pump, and to receive sensing signals of the liquid level sensor to control the rotational speeds of the first molten salt circulating pump and the molten salt return pump according to a liquid level height in the first molten salt storage tank.
2. The apparatus for heating molten salt of claim 1 wherein the number of the plurality of molten salt electrode boxes is three for each set of molten salt electrodes, the multiphase alternating current is a three-phase alternating current, each set of electrode-in insulated conduits includes three electrode-in insulated conduits, and each set of electrode-out insulated conduits includes three electrode-out insulated conduits.
3. The apparatus for heating molten salt of claim 1 wherein molten salt flowing in each of the plurality of electrode-entering insulating conduits produces a first resistance value resistor having the same resistance value and molten salt flowing in each of the plurality of electrode-exiting insulating conduits produces a second resistance value resistor having the same resistance value.
4. A device for heating molten salt as claimed in claim 3 wherein the first and second resistance values are also the same.
5. The apparatus for heating molten salt of claim 1, further comprising:
At least one second molten salt circulation pump provided in the corresponding second connection pipe for pumping the molten salt in the molten salt electrode tank to the second molten salt storage tank;
Wherein the controller is further electrically connected to the second molten salt circulation pump to control the rotational speed of the second molten salt circulation pump.
6.A method for heating molten salt using the apparatus for heating molten salt according to claim 1, the method comprising the steps of:
heating the salts in the first molten salt storage tank and the second molten salt storage tank by using a first preheater and a second preheater respectively, and heating the salts in the first molten salt storage tank and the second molten salt storage tank to a flowable molten state;
After the salt is in a flowable molten state, the first preheater and the second preheater are turned off;
Pumping molten salt in a first molten salt storage tank to a molten salt electrode box through a first connecting pipeline and an electrode feeding insulating pipeline by using a first molten salt circulating pump;
Flowing molten salt in the molten salt electrode box to a second molten salt storage tank through an electrode outlet insulating pipeline and a second connecting pipeline;
When the molten salt in the molten salt electrode box reaches the preset liquid level, a power supply device is started to supply power, so that the molten salt is heated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010849677.8A CN112113195B (en) | 2020-08-21 | 2020-08-21 | Apparatus and method for heating molten salt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010849677.8A CN112113195B (en) | 2020-08-21 | 2020-08-21 | Apparatus and method for heating molten salt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112113195A CN112113195A (en) | 2020-12-22 |
| CN112113195B true CN112113195B (en) | 2024-07-26 |
Family
ID=73805264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010849677.8A Active CN112113195B (en) | 2020-08-21 | 2020-08-21 | Apparatus and method for heating molten salt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112113195B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212339186U (en) * | 2020-08-21 | 2021-01-12 | 北京瑞特爱能源科技股份有限公司 | Device for heating molten salt |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009192193A (en) * | 2008-02-18 | 2009-08-27 | Miura Co Ltd | Boiler system |
| CN103292485B (en) * | 2013-05-09 | 2014-11-26 | 东方电气集团东方锅炉股份有限公司 | Fused salt heat storage and exchange system for solar thermal power generation |
| CN204042829U (en) * | 2014-08-12 | 2014-12-24 | 淮南中科储能科技有限公司 | High-temperature molten salt steam generation and pre-heating system |
| CN107906489B (en) * | 2017-11-30 | 2024-03-19 | 中冶南方都市环保工程技术股份有限公司 | Energy storage system for isolated power grid |
-
2020
- 2020-08-21 CN CN202010849677.8A patent/CN112113195B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212339186U (en) * | 2020-08-21 | 2021-01-12 | 北京瑞特爱能源科技股份有限公司 | Device for heating molten salt |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112113195A (en) | 2020-12-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3777117A (en) | Electric heat generating system | |
| CN106595046A (en) | Segmented heating type submerged heat exchange tube assembly | |
| CN212339186U (en) | Device for heating molten salt | |
| CN112113195B (en) | Apparatus and method for heating molten salt | |
| CN212339185U (en) | Device for heating molten salt | |
| CN111947118A (en) | Device for heating molten salt | |
| CN107318180A (en) | A kind of use heat-conducting plate heats the electric heater of fluid | |
| CN111947120A (en) | Apparatus and method for heating molten salts | |
| CN106595357A (en) | Coiled tube submerged type heat exchange assembly | |
| CN212339187U (en) | Device for heating molten salt | |
| CN212841475U (en) | Device for heating molten salt | |
| CN212339188U (en) | Device for heating molten salt | |
| CN205208945U (en) | Spiral PTC fluid heater | |
| CN111947119A (en) | Apparatus and method for heating molten salts | |
| CN205037281U (en) | Steam generator and steam cleaner | |
| CN115884452A (en) | Electric heater, heat storage device and heat storage and exchange system | |
| CN111947117A (en) | Apparatus and method for heating molten salts | |
| CN206865772U (en) | The single-end electrothermal tube of three-phase electricity input | |
| CN106595058A (en) | Immersed heat exchange tube assembly adopting regularly changed heating tube diameters | |
| CN206743575U (en) | A kind of high-performance electric heating tube | |
| CN213355616U (en) | Fused salt storage tank and fused salt system | |
| CN205957488U (en) | Water tank heat exchange structure and water heater | |
| CN204115198U (en) | A kind of PTC liquid heater | |
| CN207438916U (en) | Electromagnetic induction heater | |
| CN207180030U (en) | High voltage gas-insulated resistance-heated furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |