CN110388684B - Inorganic phase-change heat accumulating type electric heating stove and heating method - Google Patents
Inorganic phase-change heat accumulating type electric heating stove and heating method Download PDFInfo
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- CN110388684B CN110388684B CN201910602515.1A CN201910602515A CN110388684B CN 110388684 B CN110388684 B CN 110388684B CN 201910602515 A CN201910602515 A CN 201910602515A CN 110388684 B CN110388684 B CN 110388684B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D11/00—Central heating systems using heat accumulated in storage masses
- F24D11/002—Central heating systems using heat accumulated in storage masses water heating system
- F24D11/004—Central heating systems using heat accumulated in storage masses water heating system with conventional supplementary heat source
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1096—Arrangement or mounting of control or safety devices for electric heating systems
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- General Engineering & Computer Science (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention discloses an inorganic phase-change heat-accumulating type electric heating furnace and a heating method, wherein the heating furnace comprises a heat preservation water tank, an inorganic phase-change heat-accumulating pipe, an electric heating unit, a water mixing temperature control unit and an electric control unit, wherein the inorganic phase-change heat-accumulating pipe is uniformly distributed in the heat preservation water tank, the electric heating unit is arranged in the center of the heat preservation water tank, the water mixing temperature control unit is arranged between a water inlet pipe and a water outlet pipe of the heat preservation water tank, the water temperature of electric heating water outlet is controlled through the water mixing temperature control unit, the electric control unit is arranged outside the heat preservation water tank, and the heat accumulating degree in the heat preservation water tank is controlled through the electric control unit. Through the mode, the inorganic phase-change heat accumulating type electric heating furnace and the heating method have independent heating circulation and heat release circulation, can be operated independently or in a superposition manner, and can be suitable for three different working conditions: the pure heat storage working condition, the pure heat release working condition and the simultaneous heat storage and discharge working condition can realize the inorganic phase change heat storage type electric heating with low cost and long service life.
Description
Technical Field
The invention relates to the technical field of phase-change heat storage, in particular to an inorganic phase-change heat storage type electric heating furnace and a heating method.
Background
The heat accumulating electric heating stove is one device to convert electric energy into heat energy for storing in certain period and to release heat energy for heating. The electric energy can adopt solar photovoltaic power generation in daytime and valley power at night, the discontinuous photovoltaic power generation can be changed into continuous use or controllable use of heating through the use of the heat accumulating type electric heating furnace, peak clipping and valley filling of power grid power utilization are realized, and the energy utilization efficiency is improved.
The heat storage material is classified into sensible heat storage and latent heat storage according to the division of the heat storage medium.
Sensible heat storage is generally divided into water storage and solid storage: the water storage cost is the lowest and the water storage is the safest, but the sensible heat with limited temperature difference can be taken, so that the defects of small heat storage density per unit volume, large occupied area and the like are brought.
The solid storage utilizes the characteristics of large temperature change and small volume change of solid materials (magnesia bricks, ceramics, cement and the like) to realize the sensible heat storage with large temperature difference, and has the advantages of large heat storage density per unit volume and low manufacturing cost; but also has the following disadvantages: (1) High-temperature heat accumulation at the temperature of more than 600 ℃ can not ensure the operation safety and reliability of equipment; (2) The air is adopted for heat exchange, the heat exchange temperature difference is large, and the effective utilization rate of heat energy is low; (3) the heat loss of the system is extremely high.
The latent heat storage refers to a heat storage mode which utilizes a phase change energy storage material to generate solid-liquid phase change at a specific temperature (phase change temperature) and is accompanied with a large amount of heat absorption and heat release, has the characteristics of large heat storage density, almost isothermal in the heat absorption and heat release processes and the like, has the advantages of small volume, small heat storage/heat release temperature difference and the like compared with water storage and solid storage, can be applied to space-time adjustment of heat flow density, and improves the utilization efficiency of energy.
Existing phase change materials can be classified into organic phase change materials, inorganic phase change materials and composite phase change materials. The inorganic phase change material comprises crystalline hydrated salt, molten salt, metal alloy and other inorganic matters, wherein the most widely used crystalline hydrated salt and molten salt have the advantages of low material cost, high heat storage density and the like. However, the inorganic phase change material has the defects of strong corrosiveness, large volume change in the solid-liquid phase change process, poor heat conduction performance and the like, and the defects of high manufacturing cost, short service life and the like of the electric heating heat storage device are brought.
Disclosure of Invention
The invention mainly solves the technical problems of providing an inorganic phase-change heat accumulating type electric heating furnace and a heating method, which have independent heating circulation and heat release circulation, can be independently operated and also can be overlapped to be operated, and can adapt to three different working conditions: the pure heat storage working condition, the pure heat release working condition and the simultaneous heat storage and discharge working condition can realize the inorganic phase change heat storage type electric heating with low cost and long service life.
In order to solve the technical problems, the invention adopts a technical scheme that: an inorganic phase-change heat accumulating type electric heating furnace is provided, which comprises a heat preservation water tank, an inorganic phase-change heat accumulating pipe, an electric heating unit, a mixed water temperature control unit and an electric control unit, wherein the inorganic phase-change heat accumulating pipe is uniformly distributed in the heat preservation water tank, the electric heating unit is arranged in the center of the heat preservation water tank,
the mixed water temperature control unit is arranged between the water inlet pipe and the water outlet pipe of the heat preservation water tank, the electric heating water outlet temperature is controlled through the mixed water temperature control unit, the electric control unit is further arranged outside the heat preservation water tank, and the heat storage degree inside the heat preservation water tank is controlled through the electric control unit.
In a preferred embodiment of the invention, the heat preservation water tank comprises an inner container, an outer container and a heat preservation layer arranged between the inner container and the outer container, the heat preservation water tank is also provided with a water inlet, a water outlet and a flange opening,
the water inlet is positioned at the upper part of the heat preservation water tank, the water inlet pipe penetrates through the outer liner and the inner liner to be welded with a guide ring at the upper part of the guide pipe in the central electric heating unit of the heat preservation water tank, and the water inlet pipe penetrates through the inner liner of the heat preservation water tank to be sealed by welding;
the water outlet is positioned at the lower part of the heat preservation water tank, the water outlet pipe penetrates through the outer liner and the inner liner and then extends to the central position of the bottom of the inner cavity of the heat preservation water tank and is downwards perforated, and the water outlet pipe penetrates through the inner liner of the heat preservation water tank and is sealed by welding;
the flange opening is positioned at the top of the heat preservation water tank and comprises a flange bolt hole, a flange cover plate, a sealing ring and a connecting bolt, the connecting bolt penetrates through the flange bolt holes at two sides of the flange cover plate to be fixed, the sealing ring is also arranged at the inner side of the flange cover plate,
the center of the flange cover plate is also provided with a mounting hole for mounting the electric heating pipe, the mounting hole is an internal threaded hole or a flange hole, and the electric heating pipe is connected with the flange opening by adopting threaded connection or flange connection.
In a preferred embodiment of the invention, a heat storage pipe rack is arranged in the heat preservation water tank, and the inorganic phase change heat storage pipes are uniformly distributed in the heat preservation water tank through the heat storage pipe rack.
In a preferred embodiment of the invention, the inorganic phase change heat storage tube comprises an organic plastic tube, an inorganic phase change material and a tube cap, wherein the inorganic phase change material is filled in the organic plastic tube, and the tube cap is welded and fixed at two ends of the organic plastic tube.
In a preferred embodiment of the invention, the heat storage pipe rack comprises an upper pore plate, a lower pore plate and supporting columns, wherein the upper pore plate and the lower pore plate are horizontally arranged in the heat preservation water tank, and the supporting columns are arranged at the bottoms of the upper pore plate and the lower pore plate for supporting.
In a preferred embodiment of the invention, the electric heating unit comprises a guide pipe, an electric heating pipe and a guide ring, wherein the guide pipe is positioned at the central straight cylinder position of the inner cavity shaft of the heat preservation water tank, the upper opening and the lower opening of the guide pipe,
the lower part of the electric heating pipe is inserted in the guide pipe, a nickel-chromium resistance heating wire is arranged in the electric heating pipe inserted in the guide pipe, a guide ring is arranged at the top of the guide pipe, and the guide ring and the guide pipe are concentrically arranged for water inlet guide.
In a preferred embodiment of the invention, the water mixing temperature control unit comprises a bypass flow regulating valve, an electric two-way valve, a backwater temperature measuring probe and a connecting water pipe, wherein the backwater temperature measuring probe is arranged between the water inlet pipe and the water outlet pipe, the electric two-way valve is arranged at the end part of the water inlet pipe, the water inlet pipe and the water outlet pipe are communicated through the connecting water pipe to form a bypass pipeline, and the bypass flow regulating valve is arranged on the bypass pipeline.
In a preferred embodiment of the invention, the electrical control unit comprises a leakage protection switch, an alternating current contactor, a microcomputer control main board, a temperature measurement sensor and a dry-fire protection switch,
the temperature measuring blind pipe at the bottom of the heat preservation water tank is internally provided with a temperature measuring sensor, the microcomputer control main board is electrically connected with the temperature measuring sensor and the alternating current contactor, the microcomputer control main board is also in control connection with the electric leakage protection switch and the dry heating protection switch, and the electric leakage protection switch is connected to the power input end of the electric control unit.
In a preferred embodiment of the invention, the heating cycle and the heat release cycle are realized by taking water as a heat exchange medium in the inorganic phase-change heat accumulating type electric heating furnace.
In order to solve the technical problems, the invention adopts another technical scheme that: the heating method of the inorganic phase-change heat accumulating type electric heating furnace comprises the following steps of pure heat accumulating circulation working condition, pure heat releasing circulation working condition and heat accumulating and discharging working condition:
the working process of the pure heat storage cycle is as follows:
the electric heating pipe is electrified to generate heat to heat medium water in the guide pipe, the heated water temperature rise density becomes smaller and floats upwards, overflows from an upper opening of the guide pipe, is blocked by an arc end cover on the heat preservation water tank and is guided, then turns 180 degrees, sinks along a channel of the inorganic phase change heat storage pipe outside the guide pipe, is cooled and cooled, the density becomes larger, the sinking speed is faster, passes through a lower pore plate, is collected at the arc end cover below the heat preservation water tank, and turns 180 degrees to enter a lower opening of the guide pipe to supplement heated and risen water flow, so that heat storage circulation is formed;
the exothermic cycle working process is as follows:
loading a water pump, pressurizing heating backwater by the water pump, guiding the backwater through a water inlet of a heat preservation water tank, blocking the backwater by an arc end cover on the heat preservation water tank, turning the backwater 180 degrees, sinking along a channel between inorganic phase-change heat accumulating pipes outside the guide pipe, heating and heating up, penetrating through a lower pore plate, converging at the arc end cover under the heat preservation water tank, discharging water at a set temperature through a collecting pipe, a water outlet of the heat preservation water tank and a water mixing temperature control unit, cooling the water at a set temperature, entering a heating pipe network and a heat dissipation tail end, cooling the heat, pressurizing by the water pump, and entering the water inlet of the heat preservation water tank to form heat release circulation;
the working process of heating and heat release cycle is as follows:
the water heated by the electric heating pipe in the diversion pipe rises to be converged into one strand from the upper opening of the diversion pipe, the water inlet of the heat preservation water tank pressurized by the water pump and the heating backwater flowing through the diversion ring,
sinking along the channel between inorganic phase-change heat accumulating pipes outside the guide pipe, releasing heat, reducing temperature or heating up, passing through the lower pore plate, collecting at the arc end cover of the lower part of the heat-insulating water tank, supplementing heated water flow through the lower opening of the guide pipe to form heating circulation,
the other water is discharged at a certain temperature through the water mixing and temperature controlling of the water collecting pipe, the water outlet of the heat preservation water tank and the water mixing and temperature controlling unit, enters the heating pipe network and the heat dissipation tail end for heat dissipation and temperature reduction, and enters the water inlet of the heat preservation water tank through the pressurization of the water pump to form heat release circulation.
The beneficial effects of the invention are as follows: the inorganic phase-change heat accumulating type electric heating furnace and the heating method have independent heating circulation and heat release circulation, can be independently operated or operated in a superposition way, and can be suitable for three different working conditions: the pure heat storage working condition, the pure heat release working condition and the simultaneous heat storage and discharge working condition can realize the inorganic phase change heat storage type electric heating with low cost and long service life.
Drawings
For a clearer description of the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the description below are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:
FIG. 1 is a schematic view of an inorganic phase-change heat accumulating electric heating stove according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of the structure of an inorganic phase-change heat accumulating pipe in the inorganic phase-change heat accumulating type electric heating furnace;
FIG. 3 is a schematic view of the structure of a heat accumulating pipe rack and an electric heating unit in the inorganic phase change heat accumulating type electric heating furnace;
fig. 4 is a schematic structural view of a water mixing temperature control unit in the inorganic phase change heat accumulating type electric heating furnace according to the present invention;
FIG. 5 is a control schematic diagram of a water mixing temperature control unit in the inorganic phase change heat accumulating type electric heating furnace;
FIG. 6 is a control schematic diagram of an electrical control unit in the inorganic phase change heat accumulating type electric heating furnace of the present invention;
the components in the drawings are marked as follows: 100. the water heater comprises a heat preservation water tank, 110, an inner container, 120, an outer container, 130, a heat preservation layer, 140, a water inlet, 150, a water outlet, 160, a flange port, 161, a flange bolt hole, 162, a flange cover plate, 163, a sealing ring, 164, a connecting bolt, 165, a mounting hole, 170, a water inlet pipe, 180, a water outlet pipe, 190, a temperature measurement blind pipe, 200, an inorganic phase change heat storage pipe, 210, an organic plastic pipe, 220, a pipe cap, 230, an inorganic phase change material, 300, a heat storage pipe rack, 310, an upper pore plate, 320, a lower pore plate, 330, a support column, 400, an electric heating unit, 410, a guide pipe, 420, an electric heating pipe, 430, a guide ring, 500, a mixed water temperature control unit, 510, a bypass flow regulating valve, 520, an electric two-way valve, 530, a backwater temperature measuring probe, 540, a connecting pipe, 600, an electric control unit, 610, a leakage protection switch, 620, an alternating current contactor, 630, a microcomputer control main board, 640, a temperature sensor, 650 and a dry combustion protection switch.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 6, an embodiment of the present invention includes:
example 1
An inorganic phase-change heat accumulating type electric heating furnace comprises a heat preservation water tank 100, an inorganic phase-change heat accumulating pipe 200, an electric heating unit 400, a mixed water temperature control unit 500 and an electric control unit 600, wherein the inorganic phase-change heat accumulating pipe 200 is uniformly distributed in the heat preservation water tank 100, and the electric heating unit 400 is arranged in the center of the heat preservation water tank 100.
The mixed water temperature control unit 500 is arranged between the water inlet pipe and the water outlet pipe of the heat preservation water tank 100, the electric heating water outlet temperature is controlled by the mixed water temperature control unit 500, the heat preservation water tank 100 is also provided with an electric control unit 600, and the heat storage degree inside the heat preservation water tank 100 is controlled by the electric control unit 600.
The heat preservation water tank 100 comprises an inner container 110, an outer container 120 and a heat preservation layer 130 arranged between the inner container 110 and the outer container 120, wherein the heat preservation water tank 100 is also provided with a water inlet 140, a water outlet 150 and a flange opening 160,
the water inlet 140 is positioned at the upper part of the heat preservation water tank 100, the water inlet pipe 170 passes through the outer container 120 and the inner container 110 to be welded with a guide ring at the upper part of a guide pipe in the central electric heating unit 400 of the heat preservation water tank 100, and the water inlet pipe 170 passes through the inner container 110 of the heat preservation water tank 100 to be provided with a welding sealing structure.
The water outlet 150 is positioned at the lower part of the heat preservation water tank 100, the water outlet pipe 180 extends to the center position of the bottom of the inner cavity of the heat preservation water tank 100 after passing through the outer container 120 and the inner container 110 and is downwards opened, and the water outlet pipe 180 passes through the inner container 110 of the heat preservation water tank 100 and has a welding sealing structure.
The flange port 160 is located at the top of the heat preservation water tank 100, the flange port 160 comprises a flange bolt hole 161, a flange cover plate 162, a sealing ring 163 and a connecting bolt 164, the connecting bolt 164 penetrates through the flange bolt hole 161 at two sides of the flange cover plate 162 to be fixed, and the sealing ring 163 is further arranged at the inner side of the flange cover plate 162.
The center of the flange cover plate 162 is also provided with a mounting hole 165 for mounting the electric heating pipe, the mounting hole 165 is an internal threaded hole or a flange hole, and the electric heating pipe is connected with the flange opening 160 by adopting threaded connection or flange connection.
The heat storage pipe rack 300 is arranged in the heat preservation water tank 100, and the inorganic phase change heat storage pipes 200 are uniformly distributed in the heat preservation water tank 100 through the heat storage pipe rack 300.
The inorganic phase-change heat storage tube 200 comprises an organic plastic tube 210, an inorganic phase-change material 230 and a tube cap 220, wherein the inorganic phase-change material 230 is filled in the organic plastic tube 210, and the tube cap 220 is welded and fixed at two ends of the organic plastic tube 210.
The inorganic phase-change heat storage tube 200 is manufactured by the following steps: a. one end of the organic plastic tube 210 and the tube cap 220 are welded by hot melting and are vertically placed, and an opening is upward; b. filling the prepared inorganic phase change energy storage material 230 with liquid from the upper opening of the organic plastic tube 21; c. crystallizing the electrodeless phase change energy storage material 230 into a solid by water cooling or air cooling; d. the upper opening of the organic plastic pipe 210 and the pipe cap 220 are welded by hot melting to complete the manufacture of the inorganic phase change heat storage pipe 200.
The organic plastic tube 210 is made of PET, PE, PP, PS, PA, ABS and is drawn by an extrusion process.
The material of the cap 220 is the same as that of the organic plastic tube 210, and is formed by injection molding.
The inorganic phase change material 230 is a crystalline hydrated salt, including eutectic salt aqueous solutions of halides, sulfates, nitrates, phosphates, carbonates, acetates, etc. of alkali and alkaline earth metals.
The heat storage pipe rack 300 includes an upper orifice plate 310, a lower orifice plate 320, and a supporting column 330, the upper orifice plate 310 and the lower orifice plate 320 being horizontally arranged inside the heat preservation water tank 100, the supporting column 330 being provided at bottoms of the upper orifice plate 310 and the lower orifice plate 320 to support.
The electric heating unit 400 comprises a flow guide pipe 410, an electric heating pipe 420 and a flow guide ring 430, wherein the flow guide pipe 410 is positioned at the central straight cylinder position of the inner cavity shaft of the heat preservation water tank 100, and the upper opening and the lower opening of the flow guide pipe 410 are formed;
the electric heating pipe 420 is a 304 stainless steel pipe, a nickel-chromium resistance heating wire is arranged in the electric heating pipe 420 and filled with quartz powder, the lower part of the electric heating pipe 420 is inserted into the flow guiding pipe 410, and only the electric heating pipe 420 inserted into the flow guiding pipe 410 is provided with the nickel-chromium resistance heating wire;
the guide ring 430 is disposed at the top of the guide tube 410, and the guide ring 430 is disposed concentrically with the guide tube 410 for guiding the incoming water.
The water mixing temperature control unit 500 comprises a bypass flow regulating valve 510, an electric two-way valve 520, a backwater temperature measuring probe 530 and a connecting water pipe 540, wherein the backwater temperature measuring probe 530 is arranged between the water inlet pipe 170 and the water outlet pipe 180, the electric two-way valve 520 is arranged at the end part of the water inlet pipe 170, the water inlet pipe 170 and the water outlet pipe 180 are communicated through the connecting water pipe 540 to form a bypass pipeline, and the bypass flow regulating valve 510 is arranged on the bypass pipeline.
The principle of operation of the water mixing temperature control unit 500 is:
external circulating water pump starts, and heating terminal water route begins to circulate, and return water temperature probe 530 detects the return water temperature, and when return water temperature was less than the setting value, electronic two-way valve 520 was opened, and heating return water gets into the inside heating of phase change heat storage water tank from heat preservation water tank 100 water inlet and heaies up, then gets into heating terminal water route from the delivery port, through adjusting bypass flow control valve 510, let partial proportion's low temperature return water mix in the high temperature water that comes out from the delivery port through the bypass line, reaches the purpose of adjusting the play water temperature.
The electrical control unit 600 includes a leakage protection switch 610, an ac contactor 620, a microcomputer control main board 630, a temperature sensor 640 and a dry-fire protection switch 650,
a temperature measuring sensor 640 is arranged in the temperature measuring blind pipe at the bottom of the heat preservation water tank 100, a microcomputer control main board 630 is electrically connected with the temperature measuring sensor 640 and an alternating current contactor 620, the microcomputer control main board 630 is also in control connection with a leakage protection switch 610 and a dry-heating protection switch 650, the leakage protection switch 610 is connected with a power input end of an electric control unit 600,
when the water cut-off condition occurs in the heat preservation water tank, the dry heating protection switch is started, and the power supply is cut off to work no longer.
The electrical control unit 600 operates on the principle that:
after the system is electrified and started, the microcomputer control main board 630 detects the water temperature T in the heat preservation water tank 100 through the temperature sensor 640 in the heat preservation water tank 100 2 ：
When T is 2 If the set temperature is not reached, the alternating-current contactor 620 is started, and the electric heating pipe 420 is electrified to heat;
when T is 2 The set temperature is reached, which indicates that the heat storage in the heat preservation water tank 100 is full, the ac contactor 620 is closed, and the electric heating pipe 420 is powered off to stop heating.
The heating circulation and the heat release circulation are realized by taking water as a heat exchange medium in the inorganic phase-change heat accumulating type electric heating furnace, the heat accumulation degree of the inorganic phase-change heat accumulating type electric heating furnace is controlled by the electric control unit 600, and the water temperature of the inorganic phase-change heat accumulating type electric heating water outlet is controlled by the water mixing temperature control unit 500.
The heating cycle and the heat release cycle are two mutually independent systems, can be operated independently and can also be operated in a superposition way, so as to adapt to three different working conditions of the inorganic phase-change heat accumulating type electric heating furnace: pure heat storage working condition, pure heat release working condition and heat storage and release working condition.
Example two
The inorganic phase-change heat accumulating type electric heating furnace in the first embodiment is adopted, and the heating cycle working principle is as follows:
the electric heating pipe 420 is electrified to generate heat to heat the heat exchange medium water in the flow guide pipe 410, the heated water temperature rise density is reduced, the water floats upwards, overflows from the upper opening of the flow guide pipe 410, is blocked and guided by the circular arc end cover on the heat preservation water tank 100, turns 180 degrees, sinks along the channel of the inorganic phase change heat storage pipe 200 outside the flow guide pipe 410, is cooled, has higher density, has higher sinking speed, passes through the lower pore plate 320, is collected at the circular arc end cover under the heat preservation water tank 100, and enters the lower opening of the flow guide pipe 410 to supplement the heated water flow to form a cycle, which is the natural convection internal cycle of electric heating, namely the heating cycle.
In the heating cycle, because the temperature of the hot water is greater than the phase change point of the electrodeless phase change material 230 in the heat storage tube 200, the electrodeless phase change material 230 in the inorganic phase change heat storage tube 200 is heated and dissolved and is changed into a liquid state from a solid state when cooling down and sinking when passing through a gap channel of the inorganic phase change heat storage tube 200.
Since the volume of the electrodeless phase change material 230 expands in the dissolution process, local swelling of the organic plastic tube 210 is brought, and long-term operation affects the service life of the organic plastic tube 210, the problem is effectively solved by adopting heating from top to bottom.
Example III
The inorganic phase-change heat accumulating type electric heating furnace in the first embodiment is adopted, and the heat release circulation working principle is as follows:
the heat release cycle is forced convection heat exchange cycle loaded with a water pump, heating backwater is pressurized by the water pump, is guided by a water inlet 140 of a heat preservation water tank 100 through a guide ring 430, is blocked by an arc end cover on the heat preservation water tank 100, turns 180 DEG, sinks along a channel between inorganic phase change heat accumulating pipes 2 outside the guide pipe 410, is heated and warmed, passes through a lower orifice plate 320, is collected at the arc end cover under the heat preservation water tank 100, is discharged at a certain temperature through a collecting pipe, a heat preservation water tank water outlet 150 and a mixed water temperature control unit 500, enters a heating pipe network, and is cooled and cooled at the tail end of heat dissipation, and is pressurized by the water pump, and enters the water inlet 140 of the heat preservation water tank 100 to form a cycle, which is forced convection heat exchange cycle and is also called heat release cycle.
In the heat release cycle process, the return water temperature is smaller than the phase change point of the electrodeless phase change material 230 in the inorganic phase change heat storage tube 200, so that the temperature is heated and raised when the gap passage of the inorganic phase change heat storage tube 200 passes through, and the electrodeless phase change material 230 in the inorganic phase change heat storage tube 200 releases heat and crystallizes, so that the inorganic phase change heat storage tube 200 is changed from a liquid state to a solid state.
Example IV
The working principle of adopting the inorganic phase-change heat accumulating type electric heating stove in the first embodiment and heating and heat releasing circulation is as follows:
the heating-while-heat release cycle is the superposition of a heating cycle and a heat release cycle, in the process, water heated by the electric heating pipe 420 in the flow guide pipe 410 rises to form a strand with heating backwater flowing through the water inlet 140 of the heat preservation water tank 100 and the flow guide ring 430 when being pressurized by the water pump from the upper opening of the flow guide pipe 410;
the inorganic phase-change heat storage pipes 200 sink along the channels outside the guide pipe 410, and emit heat to cool (the mixed water temperature is higher than the phase-change point temperature of the inorganic phase-change material 230) or heat to warm (the mixed water temperature is lower than the phase-change point temperature of the inorganic phase-change material 230), pass through the lower pore plate 320, are gathered at the arc end cover of the lower part of the heat-preservation water tank 100, and one stream of water enters the lower opening of the guide pipe 410 to supplement the heated water flow to form heating circulation;
the other water is discharged at a certain temperature through the water mixing and temperature controlling of the water collecting pipe, the water outlet 150 of the heat preservation water tank 100 and the water mixing and temperature controlling unit 500, enters the heating pipe network and the heat dissipation tail end for heat dissipation and temperature reduction, and enters the water inlet 140 of the heat preservation water tank 100 through the pressurization of the water pump to form heat release circulation.
The inorganic phase-change heat accumulating type electric heating furnace and the heating method have the beneficial effects that:
the heating device has independent heating circulation and exothermic circulation, can be independently operated and can also be operated in a superposition manner, and can adapt to three different working conditions: the pure heat storage working condition, the pure heat release working condition and the simultaneous heat storage and discharge working condition can realize the inorganic phase change heat storage type electric heating with low cost and long service life.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related arts are included in the scope of the present invention.
Claims (8)
1. An inorganic phase-change heat accumulating type electric heating furnace is characterized by comprising a heat preservation water tank, an inorganic phase-change heat accumulating pipe, an electric heating unit, a mixed water temperature control unit and an electric control unit, wherein the inorganic phase-change heat accumulating pipe is uniformly distributed in the heat preservation water tank, the electric heating unit is arranged in the center of the heat preservation water tank,
the water mixing temperature control unit is arranged between the water inlet pipe and the water outlet pipe of the heat preservation water tank, the water temperature of the electric heating water outlet is controlled by the water mixing temperature control unit, the heat preservation water tank is also provided with an electric control unit, the heat storage degree in the heat preservation water tank is controlled by the electric control unit,
wherein the electric heating unit comprises a flow guide pipe, an electric heating pipe and a flow guide ring, the flow guide pipe is positioned at the central straight cylinder position of the inner cavity shaft of the heat preservation water tank, the upper opening and the lower opening of the flow guide pipe,
the lower part of the electric heating pipe is inserted into the guide pipe, a nickel-chromium resistance heating wire is arranged in the electric heating pipe inserted into the guide pipe, a guide ring is arranged at the top of the guide pipe, the guide ring and the guide pipe are concentrically arranged for water inlet guide,
the water mixing temperature control unit comprises a bypass flow regulating valve, an electric two-way valve, a backwater temperature measuring probe and a connecting water pipe, wherein the backwater temperature measuring probe is arranged between the water inlet pipe and the water outlet pipe, the electric two-way valve is arranged at the end part of the water inlet pipe, the water inlet pipe is communicated with the water outlet pipe through the connecting water pipe to form a bypass pipeline, and the bypass flow regulating valve is arranged on the bypass pipeline.
2. The inorganic phase-change heat accumulating type electric heating furnace according to claim 1, wherein the heat preservation water tank comprises an inner container, an outer container and a heat preservation layer arranged between the inner container and the outer container, the heat preservation water tank is also provided with a water inlet, a water outlet and a flange opening,
the water inlet is positioned at the upper part of the heat preservation water tank, the water inlet pipe penetrates through the outer liner and the inner liner to be welded with a guide ring at the upper part of the guide pipe in the central electric heating unit of the heat preservation water tank, and the water inlet pipe penetrates through the inner liner of the heat preservation water tank to be sealed by welding;
the water outlet is positioned at the lower part of the heat preservation water tank, the water outlet pipe penetrates through the outer liner and the inner liner and then extends to the central position of the bottom of the inner cavity of the heat preservation water tank and is downwards perforated, and the water outlet pipe penetrates through the inner liner of the heat preservation water tank and is sealed by welding;
the flange opening is positioned at the top of the heat preservation water tank and comprises a flange bolt hole, a flange cover plate, a sealing ring and a connecting bolt, the connecting bolt penetrates through the flange bolt holes at two sides of the flange cover plate to be fixed, the sealing ring is also arranged at the inner side of the flange cover plate,
the center of the flange cover plate is also provided with a mounting hole for mounting the electric heating pipe, the mounting hole is an internal threaded hole or a flange hole, and the electric heating pipe is connected with the flange opening by adopting threaded connection or flange connection.
3. The inorganic phase-change heat accumulating type electric heating furnace according to claim 1, wherein a heat accumulating pipe rack is arranged in the heat preserving water tank, and the inorganic phase-change heat accumulating pipes are uniformly distributed in the heat preserving water tank through the heat accumulating pipe rack.
4. The inorganic phase-change heat accumulating type electric heating furnace according to claim 3, wherein the inorganic phase-change heat accumulating tube comprises an organic plastic tube, an inorganic phase-change material and a tube cap, the inorganic phase-change material is filled in the organic plastic tube, and the tube cap is welded and fixed at two ends of the organic plastic tube.
5. The inorganic phase-change heat accumulating type electric heating furnace according to claim 3, wherein the heat accumulating tube rack comprises an upper orifice plate, a lower orifice plate and a supporting column, the upper orifice plate and the lower orifice plate are horizontally arranged in the heat insulating water tank, and the supporting column is arranged at the bottoms of the upper orifice plate and the lower orifice plate for supporting.
6. The inorganic phase-change heat accumulating type electric heating furnace according to claim 1, wherein the electric control unit comprises an electric leakage protection switch, an alternating current contactor, a microcomputer control main board, a temperature measuring sensor and a dry heating protection switch,
the temperature measuring blind pipe at the bottom of the heat preservation water tank is internally provided with a temperature measuring sensor, the microcomputer control main board is electrically connected with the temperature measuring sensor and the alternating current contactor, the microcomputer control main board is also in control connection with the electric leakage protection switch and the dry heating protection switch, and the electric leakage protection switch is connected to the power input end of the electric control unit.
7. The inorganic phase-change heat accumulating type electric heating furnace according to claims 1-6, wherein the heating cycle and the heat release cycle are realized by taking water as a heat exchange medium in the inorganic phase-change heat accumulating type electric heating furnace.
8. A heating method of an inorganic phase-change heat accumulating type electric heating furnace, which is characterized in that the inorganic phase-change heat accumulating type electric heating furnace according to claim 7 is adopted, and the heating method comprises the following working conditions of pure heat accumulating circulation, pure heat releasing circulation and heat accumulating and discharging simultaneously:
the working process of the pure heat storage cycle is as follows:
the electric heating pipe is electrified to generate heat to heat medium water in the guide pipe, the heated water temperature rise density becomes smaller and floats upwards, overflows from an upper opening of the guide pipe, is blocked by an arc end cover on the heat preservation water tank and is guided, then turns 180 degrees, sinks along a channel of the inorganic phase change heat storage pipe outside the guide pipe, is cooled and cooled, the density becomes larger, the sinking speed is faster, passes through a lower pore plate, is collected at the arc end cover below the heat preservation water tank, and turns 180 degrees to enter a lower opening of the guide pipe to supplement heated and risen water flow, so that heat storage circulation is formed;
the exothermic cycle working process is as follows:
loading a water pump, pressurizing heating backwater by the water pump, guiding the backwater through a water inlet of a heat preservation water tank, blocking the backwater by an arc end cover on the heat preservation water tank, turning the backwater 180 degrees, sinking along a channel between inorganic phase-change heat accumulating pipes outside the guide pipe, heating and heating up, penetrating through a lower pore plate, converging at the arc end cover under the heat preservation water tank, discharging water at a set temperature through a collecting pipe, a water outlet of the heat preservation water tank and a water mixing temperature control unit, cooling the water at a set temperature, entering a heating pipe network and a heat dissipation tail end, cooling the heat, pressurizing by the water pump, and entering the water inlet of the heat preservation water tank to form heat release circulation;
the heat release cycle working process while heating is as follows:
the water heated by the electric heating pipe in the diversion pipe rises to be converged into one strand from the upper opening of the diversion pipe, the water inlet of the heat preservation water tank pressurized by the water pump and the heating backwater flowing through the diversion ring,
sinking along the channel between inorganic phase-change heat accumulating pipes outside the guide pipe, releasing heat, reducing temperature or heating up, passing through the lower pore plate, collecting at the arc end cover of the lower part of the heat-insulating water tank, supplementing heated water flow through the lower opening of the guide pipe to form heating circulation,
the other water is discharged at a certain temperature through the water mixing and temperature controlling of the water collecting pipe, the water outlet of the heat preservation water tank and the water mixing and temperature controlling unit, enters the heating pipe network and the heat dissipation tail end for heat dissipation and temperature reduction, and enters the water inlet of the heat preservation water tank through the pressurization of the water pump to form heat release circulation.
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| CN113654385B (en) * | 2021-08-31 | 2023-08-08 | 中国船舶重工集团公司第七0三研究所 | High-efficient solid-state heat storage device's circuit structure |
| CN115059952B (en) * | 2022-05-27 | 2023-06-27 | 常州大学 | Ice source heat pump system and device utilizing phase change density difference for heat exchange |
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