CN214620778U - Spiral coil pipe type phase change heat storage device - Google Patents
Spiral coil pipe type phase change heat storage device Download PDFInfo
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- CN214620778U CN214620778U CN202023320296.5U CN202023320296U CN214620778U CN 214620778 U CN214620778 U CN 214620778U CN 202023320296 U CN202023320296 U CN 202023320296U CN 214620778 U CN214620778 U CN 214620778U
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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/14—Thermal energy storage
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Abstract
The utility model discloses a spiral coil pipe formula phase transition heat-retaining device, include: a protective housing having an interior cavity; the heat preservation layer is arranged in the protective shell and comprises an inner container arranged at an interval with the protective shell and a heat preservation material arranged between the protective shell and the inner container; the spiral coil type heat exchange tube is arranged in the cavity of the protective shell; a plurality of rows of electric heating elements, wherein each row is positioned between every two heat exchange coil pipes, each row comprises the electric heating elements which are uniformly distributed in a multi-layer manner from top to bottom, and each electric heating element is horizontally arranged; and the phase change material is filled in the protective shell and outside the spiral coil type heat exchange tube. The problem of current multilayer coil pipe series connection flow resistance too big is solved.
Description
Technical Field
The utility model belongs to the technical field of the phase transition heat-retaining, concretely relates to spiral coil formula phase transition heat-retaining device.
Background
The heat storage technology can effectively solve the problem that the energy consumption end and the energy supply end are not matched in time and quantity, wherein the phase-change heat storage technology has the advantages of high heat storage density, stable heat supply temperature and the like, and is considered to be one of the most promising energy storage technologies at the present stage. The heat storage device is the core part of the phase-change heat storage system, the spiral coil is a heat exchange tube with a compact structure, and compared with a straight tube, the heat transfer coefficient of fluid in the spiral coil is higher. At present, the current spiral coil pipe formula phase change heat-retaining device adopts the form of single-deck spiral coil pipe structure or multilayer spiral coil pipe end to end series connection, and wherein single-deck spiral coil pipe structure is simple, but it only is applicable to the less environment of device thermal capacity, this is because under great thermal capacity, in order to satisfy the heat transfer demand, the number of coils is more when adopting single-deck spiral coil pipe structure, and the device flow resistance is too big, and in addition, single-deck coil pipe structure easily brings the inside heat-retaining material temperature distribution inhomogeneous problem of device, melts-solidifies the blind area more. The structural form of adopting the multilayer coil pipe to establish ties can effectively improve the inside heat-retaining material temperature distribution homogeneity of device, still can not effectively solve the too big problem of device flow resistance under big thermal capacity still.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a spiral coil pipe formula phase transition heat-retaining device to solve the too big problem of current multilayer coil pipe series connection flow resistance.
The utility model adopts the following technical scheme: a spiral coil type phase change heat storage device comprises:
a protective housing having an interior cavity;
the heat preservation layer is arranged in the protective shell and comprises an inner container arranged at an interval with the protective shell and a heat preservation material arranged between the protective shell and the inner container;
the spiral coil type heat exchange tube is arranged in the cavity of the protective shell;
the structure is as follows:
the upper header is an annular or spherical header and is positioned at the top of the cavity of the protective shell;
the lower collecting box is an annular or spherical collecting box, is arranged under the upper collecting box at intervals, and is provided with the bottom of the cavity of the protective shell;
the heat exchange system comprises at least two heat exchange coil pipes, a heat exchanger and a heat exchanger, wherein the at least two heat exchange coil pipes are uniformly and annularly distributed between a lower header and an upper header;
a plurality of rows of electric heating elements, wherein each row is positioned between every two heat exchange coil pipes, each row comprises the electric heating elements which are uniformly distributed in a multi-layer manner from top to bottom, and each electric heating element is horizontally arranged;
and the phase change material is filled in the protective shell and outside the spiral coil type heat exchange tube.
Furthermore, the upper header is connected with a vertically arranged heat exchange fluid outlet pipe, and the lower header is connected with a vertically arranged heat exchange fluid inlet pipe.
Furthermore, a temperature measuring element is arranged above the center in the protective shell and is a thermocouple with a temperature measuring blind pipe.
Further, the protective housing has an open top with a removable cover plate 8 disposed on the top.
Furthermore, each electric heating element is fixed on the side wall of the protective shell through a flange tube seat.
Furthermore, an insulating layer is arranged outside the electric heating element.
Furthermore, the diameter of the heat exchange coil is 10-30 mm, and the thickness of the tube wall is 1.5-3.5 mm.
Further, the heat exchange coil is in a spiral ascending type or a horizontal surrounding type.
Furthermore, the bending radius of the heat exchange coil is at least 3-5 times of the tube diameter of the heat exchange coil.
The utility model has the advantages that: the structure form that a plurality of groups of spiral coil pipes with equal pitch and equal length are connected in parallel is adopted, and the flow resistance of each group of heat exchange coil pipes is equal, so that the flow deviation of heat exchange fluid entering each group of heat exchange coil pipes is reduced, the temperature distribution uniformity of heat storage materials in the device in the heat charging and discharging stage is improved, the melting-solidification dead zone is eliminated, and the heat storage and discharge efficiency of the device is improved. When the heat capacity is large, the heat exchange tube parallel structure is adopted, and under the condition of meeting the heat exchange area, the flow resistance of the heat storage device can be reduced, and the energy consumption of the system is reduced.
Drawings
Fig. 1 is a schematic structural view of a spiral coil type phase change heat storage device of the present invention;
FIG. 2 is a top view of FIG. 1;
fig. 3 is the structural schematic diagram of the spiral coil type heat exchange tube of the spiral coil type phase change heat storage device of the present invention.
In the figure, 1 is a heat exchange fluid inlet pipe, 2 is a lower collecting box, 3 is a heat exchange coil, 4 is an upper collecting box, 5 is a heat exchange fluid outlet pipe, 6 is a heat insulation layer, 7 is an electric heating element, 8 is a cover plate, 9 is a phase change heat storage material, and 10 is a protective shell.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The utility model provides a spiral coil type phase change heat-retaining device, as shown in figure 1-2, including protecting sheathing 10, heat preservation 6, spiral coil type heat exchange tube, multiseriate electric heating element 7 and phase change material 9.
Therein, a protective housing 10 having an interior cavity. The heat preservation layer 6 is arranged in the protective shell 10, and the heat preservation layer 6 comprises an inner container and a heat preservation material, wherein the inner container and the heat preservation material are arranged at intervals of the protective shell 10, and the heat preservation material is arranged between the protective shell 10 and the inner container.
Wherein, the spiral coil type heat exchange tube is arranged inside the cavity of the protective shell 10. As shown in fig. 3, the spiral coil type heat exchange tube includes an upper header 4, a lower header 2, and at least two heat exchange coils 3. The structure specifically includes: the upper header 4 is a ring-shaped or spherical header and is located at the top of the cavity of the protective enclosure 10. The lower header 2 is an annular or spherical header and is arranged under the upper header 4 at intervals and is suspended at the bottom of the cavity of the protective shell 10. At least two heat exchange coil pipes 3 are uniformly and annularly distributed between the lower header 2 and the upper header 4, a fluid inlet pipe of each heat exchange coil pipe 3 is respectively welded in parallel to the lower header 2, and a fluid outlet pipe of each heat exchange coil pipe 3 is respectively welded in parallel to the upper header 4.
The pitches and the lengths of the heat exchange coil pipes 3 are equal. A plurality of heat exchange coil pipes 3 with equal pitch and equal length are uniformly distributed and arranged in the cylinder, and the number of the heat exchange coil pipes is a natural number more than 1. The diameter of each heat exchange coil is 10-30 mm, and the wall thickness of each heat exchange coil is 1.5-3.5 mm. The compression strength of the heat exchange tube with small diameter is increased, the wall thickness can be reduced compared with the heat exchange tube with large diameter, and the material consumption of the heat exchange tube is reduced; and the small pipe diameter can improve the heat exchange coefficient and enhance the heat exchange effect. However, the diameter of the heat exchange pipe is too small, so that the flow resistance is increased, the heat exchange effect and the flow resistance condition are integrated, and the diameter of the heat exchange coil is 10-30 mm; under the condition of simultaneously considering heat conduction resistance and corrosion resistance of the heat exchange tube, the thickness of the tube wall is 1.5-3.5 mm.
The vertical direction and the horizontal direction of each heat exchange coil 3 are respectively fixed through multiple points on the inner wall of the protective shell, the fixing mode can be welding, or U-shaped bolts are sleeved on the heat exchange coils, and then the U-shaped bolts are welded on the inner wall of the protective shell through angle steel.
In some embodiments, the heat exchange coil 3 is spiral-wound or horizontally wound. The bending radius of the heat exchange coil 3 is at least 3-5 times of the pipe diameter of the heat exchange coil.
The gaps of each heat exchange coil 3 are filled with phase change heat storage materials 9, and 10% of volume expansion space of the phase change heat storage materials 9 is reserved at the top of a cavity formed by the protective shell.
Wherein, in the multiseriate electric heating element 7 every row electric heating element 7 is located between two liang of heat transfer coil pipes 3, every row electric heating element 7 includes the electric heating element 7 that divides the multilayer to lay evenly from top to bottom, and every electric heating element 7 is the level setting. And a row of electric heating elements 7 is arranged between every two adjacent groups of heat exchange coil pipes 3. In some embodiments, one end of each electric heating element 7 is supported and fixed by a flange pipe seat on the side wall of the protective shell, and the other end of each electric heating element 7 is supported and limited by a supporting pipe in the protective shell. Wherein, the stay tube adopts the stainless steel pipe of vertical arrangement or horizontal arrangement, and two adjacent stainless steel pipe junctions adopt the clamp to fix, and the tip of stainless steel pipe and protective housing's bottom or lateral wall welding.
The electric heating element 7 is matched with a control device, so that the heating power can be adjusted, and the heating power can be flexibly adjusted according to the valley power time and the user requirements. The outer side of the flange tube seat of the electric heating element 7 is wrapped with a heat insulation layer, and the thickness of the heat insulation layer is selected according to the use temperature of the phase change heat storage material and the heat loss requirement of the device.
Compared with a single high-power heating element, the multi-group low-power electric heating elements increase the heat transfer surface area, are easy to distribute and arrange, improve the uniformity of heat transfer, and improve the problem of dead zones caused by the heated melting of PCM. The single low-power electric heating element is light in weight and easy to arrange and install. The adoption of multiple groups of low-power heating elements is more convenient for flexibly regulating and controlling the heating power compared with the adoption of a single high-power heating element.
Wherein, the phase change material 9 is filled inside the protective shell 10 and outside the spiral coil type heat exchange tube. According to the temperature requirement of the heat using environment, the phase change heat storage material with the appropriate phase change temperature is selected. For example, when the heat storage device is used for valley heating, the phase change temperature of the selected phase change heat storage material is 45-85 ℃, and crystalline hydrated salt or paraffin can be selected.
In some embodiments, the upper header 4 is connected to a vertically arranged heat exchange fluid outlet pipe 5 and the lower header 2 is connected to a vertically arranged heat exchange fluid inlet pipe 1. The arrangement mainly ensures that the heat exchange fluid enters from bottom to top, the fluid can be filled in the space of the heat exchange pipeline, air and the like in the pipeline are easy to flow along with the heat exchange fluid and are discharged from an upper outlet, and the heat exchange effect is ensured.
In some embodiments, a temperature measuring element is disposed above the center inside the protective casing 10 to monitor the temperature change of the phase change heat storage material and prevent over temperature. The temperature measuring element is a thermocouple with a temperature measuring blind pipe. The temperature measuring element is a thermocouple with a temperature measuring blind pipe, and the blind pipe is used for isolating the thermocouple from being in direct contact with the phase change heat storage material to prevent the phase change heat storage material from being corroded. The temperature measuring element is arranged at the position far away from the heat exchange tube bundle and having the maximum thermal resistance, namely the position above the center of the device, and the temperature at the position is the slowest position of the temperature change of the phase change material in the spiral coil type phase change heat storage device, so that the temperature at the position reaches a preset value in the heat storage or heat release process, and the temperature of the whole spiral coil type phase change heat storage device reaches the preset value.
In some embodiments, the protective enclosure 10 has an open top with a removable cover plate 8 disposed on top. Protective housing's inside wall and bottom all set up heat preservation 6, and the top sets up detachable apron 8 to reduce holistic heat loss.
The pipeline materials of the inner container, the protective shell, the heat exchange coil, the upper collecting box, the lower collecting box and the heat exchange fluid inlet and outlet pipe are all stainless steel, two ports of the heat exchange coil are respectively welded and sealed with the upper collecting box and the lower collecting box, the heat exchange fluid inlet pipe and the inner container are welded and sealed, the heat exchange fluid outlet pipe and the inner container are welded and sealed, and finally, an integrated structure is fixedly formed.
The utility model relates to a method for using spiral coil pipe formula phase transition heat-retaining device does:
1. the heat storage process: the electric heating element 7 is started according to the heat demand, because the heating of the heating element 7 causes the phase-change heat storage material 9 around the heating element to gradually heat up and change from a solid state to a liquid state, the heat energy converted from the electric energy of the heating element 7 is stored in the phase-change heat storage material 9 in the form of small part of sensible heat and large amount of latent heat, and the process is a heat storage stage of a spiral coil type phase-change heat storage device. In this stage, a temperature measuring element arranged inside the spiral coil type phase change heat storage device monitors the internal temperature change in real time, and when the temperature rises to a preset value, all the electric heating elements 7 are turned off, and the heat storage process is completed.
2. An exothermic process: when a user needs to take heat, the low-temperature heat transfer fluid boosted by the delivery pump flows into the lower header 2 from the heat transfer fluid inlet pipe 1, and mixed distribution of the fluid is performed in the lower header 2, so that the heat transfer fluid is uniformly distributed to the heat transfer coils 3 connected in parallel. The high-temperature phase-change heat storage material 9 after the heat storage is finished transfers heat to low-temperature heat exchange fluid through the pipe wall of the heat exchange coil 3, the heat exchange fluid heated by each group of spiral coils 3 is collected in the upper header 4 and flows out to a user side from the heat exchange fluid outlet pipe 5, and the process is a heat release process of the spiral coil type phase-change heat storage device. When a temperature measuring element arranged in the spiral coil type phase change heat storage device displays that the internal temperature is reduced to a preset value, the fluid conveying device of the heat exchange fluid inlet pipe 1 is closed, and the heat release process is finished.
The utility model discloses an among the spiral coil formula phase change heat storage device, adopt the parallelly connected structural style of multiunit spiral heat transfer coil pipe of equal pitch length, because each group's parallelly connected heat transfer coil pipe's structural parameter is the same completely, each group's heat transfer coil pipe 3's flow resistance equals, thereby eliminated because each group's heat transfer coil pipe resistance falls the different flow deviation problem that brings, improve the inside heat-retaining material of spiral coil formula phase change heat storage device and fill the temperature distribution homogeneity of heat stage, eliminate and melt-solidify the blind spot, the improvement device stores the thermal efficiency.
When the heat capacity is large, the heat exchange coil parallel structure is adopted, and under the condition of meeting the heat exchange area, the flow resistance of the heat storage device can be reduced, and the energy consumption of the system can be reduced. The spiral coil type phase change heat storage device is internally provided with the electric heating element, active heat storage and passive heat release are realized, the heat loss of the heating element is reduced, the heat storage rate is improved, the integration level of the device is high, the structure is simple, and the processing is easy. Each component of the spiral coil type phase-change heat storage device is made of stainless steel materials, has high temperature resistance, pressure resistance and corrosion resistance, can select ideal phase-change heat storage materials according to actual heat temperature, and is wide in working temperature range.
Claims (9)
1. A spiral coil type phase change heat storage device is characterized by comprising:
a protective housing (10) having an interior cavity;
the heat preservation layer (6) is arranged in the protective shell (10) and comprises an inner container arranged at an interval with the protective shell (10) and a heat preservation material arranged between the protective shell (10) and the inner container;
the spiral coil type heat exchange tube is arranged in the cavity of the protective shell (10);
the structure is as follows:
an upper header (4) which is a ring-shaped or spherical header and is positioned at the top of the cavity of the protective shell (10);
the lower collecting box (2) is an annular or spherical collecting box, is arranged under the upper collecting box (4) at intervals, and is arranged at the bottom of the cavity of the protective shell (10);
the heat exchanger comprises at least two heat exchange coil pipes (3), wherein the at least two heat exchange coil pipes (3) are uniformly and annularly distributed between a lower header (2) and an upper header (4), one end of each heat exchange coil pipe (3) is connected to the upper header (4), the other end of each heat exchange coil pipe (3) is connected to the lower header (2), and the pitch and the length of each heat exchange coil pipe (3) are equal;
a plurality of rows of electric heating elements (7), wherein each row is positioned between every two heat exchange coil pipes (3), each row comprises the electric heating elements (7) which are uniformly distributed in a plurality of layers from top to bottom, and each electric heating element (7) is horizontally arranged;
and the phase change material (9) is filled inside the protective shell (10) and outside the spiral coil type heat exchange tube.
2. The spiral coil type phase-change heat storage device as claimed in claim 1, wherein the upper header (4) is connected to a vertically arranged heat exchange fluid outlet pipe (5), and the lower header (2) is connected to a vertically arranged heat exchange fluid inlet pipe (1).
3. The spiral coil type phase change heat storage device as claimed in claim 1 or 2, wherein a temperature measuring element is arranged above the center inside the protective casing (10), and the temperature measuring element is a thermocouple with a temperature measuring blind pipe.
4. A spiral coil type phase change heat storage device according to claim 3, wherein the protective casing (10) has an open top, and a detachable cover plate (8) is provided on the top.
5. A spiral coil type phase change heat storage device as claimed in claim 3, wherein each of said electric heating elements (7) is fixed to a side wall of said protective casing (10) by a flange base.
6. A spiral coil type phase change heat storage device according to claim 5, wherein an insulating layer is provided outside the electric heating element (7).
7. The spiral coil type phase change heat storage device as claimed in claim 3, wherein the diameter of the heat exchange coil (3) is 10-30 mm, and the thickness of the tube wall is 1.5-3.5 mm.
8. A spiral coil type phase change heat storage device as claimed in claim 3, wherein the heat exchange coil (3) is of a spiral rising type or a horizontal surrounding type.
9. The spiral coil type phase change heat storage device as claimed in claim 3, wherein the bending radius of the heat exchange coil (3) is at least 3-5 times the tube diameter of the heat exchange coil.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023320296.5U CN214620778U (en) | 2020-12-31 | 2020-12-31 | Spiral coil pipe type phase change heat storage device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023320296.5U CN214620778U (en) | 2020-12-31 | 2020-12-31 | Spiral coil pipe type phase change heat storage device |
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| CN214620778U true CN214620778U (en) | 2021-11-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112683096A (en) * | 2020-12-31 | 2021-04-20 | 思安新能源股份有限公司 | Spiral coil pipe type phase change heat storage device |
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- 2020-12-31 CN CN202023320296.5U patent/CN214620778U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112683096A (en) * | 2020-12-31 | 2021-04-20 | 思安新能源股份有限公司 | Spiral coil pipe type phase change heat storage device |
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