CN110726320A - Electric heating protective sleeve for solid electric heat storage furnace - Google Patents
Electric heating protective sleeve for solid electric heat storage furnace Download PDFInfo
- Publication number
- CN110726320A CN110726320A CN201910947486.2A CN201910947486A CN110726320A CN 110726320 A CN110726320 A CN 110726320A CN 201910947486 A CN201910947486 A CN 201910947486A CN 110726320 A CN110726320 A CN 110726320A
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- China
- Prior art keywords
- electric heating
- heat storage
- electric
- ceramic tube
- protective sleeve
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- 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.)
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- 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
- F28D20/0056—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using solid heat storage material
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- 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
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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
- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Details (AREA)
Abstract
A protective sleeve for a solid electric storage furnace relates to a system which converts electric energy into heat energy, stores the heat energy in a solid heat storage material, takes out the stored heat energy by using air, and supplies hot water or steam to the outside by heating water in a boiler. The protection sleeve for the solid electric storage furnace comprises: (1) the electric heating element is placed in an electric heating protective sleeve which is arranged in an electric heating channel, so that the scheme that a heat storage material is used as an insulating material and is directly installed in a contact mode or an electric heating rod with a metal sleeve outside in the prior art is replaced; (2) the electric heating protective sleeve consists of a ceramic tube and an insulating ring; (3) the electric heating element is installed in contact with the ceramic tube, a plurality of holes are formed in the ceramic tube along the length direction, and the ceramic tube mainly has the functions of high temperature resistance and is isolated from the solid heat storage material; (4) the insulating rings are sleeved outside the ceramic tubes, more than two insulating rings are arranged along the length direction of the ceramic tubes to isolate the ceramic tubes from the solid heat storage material, and the insulating rings mainly have the function of good insulation at high temperature. The invention has the advantages of reducing the manufacturing and operating cost of the electric regenerative furnace and improving the service life and reliability of the electric heating element.
Description
Technical Field
The invention relates to a solid electric heat storage furnace device, in particular to a system which converts electric energy into heat energy, stores the heat energy in a solid heat storage material, takes out the stored heat energy by utilizing air, and supplies hot water or steam to the outside by heating water in a boiler.
Background
With the improvement of the living standard of people, the power supply peak-valley difference is increased year by year, which brings great difficulty and economic loss to the operation of the power grid. In order to alleviate the contradiction, the power department of China sets up a relevant power utilization guide policy, namely: in the low ebb period of the electricity consumption, the price of the electricity is lower; in the peak period of power utilization, the price of the power is higher, and the power utilization in the off-peak period is encouraged. The solid electric heat accumulation furnace device is a technical scheme appearing on the background, electric energy is converted into heat energy to be stored in the electricity utilization valley period, the stored heat energy can be used in the electricity utilization peak period and is continuously released to a heating system or a domestic hot water system, and therefore electricity utilization pressure in the electricity utilization peak period is relieved.
A typical internal structure of a solid electric regenerator is shown in fig. 1. The heat accumulating bricks of different types and structures are piled up to form solid heat accumulating material, and at the same time, the heat accumulating material also forms air channel and electrothermal channel. The circulating air in the air duct continuously takes out the heat in the heat storage material through heat exchange with the heat storage material.
The electric heating channel is arranged for the electric heating element, and the electric heating channel converts electric energy into heat energy with larger electric power by utilizing valley electricity in a low electricity price period, heats the solid heat storage material to a higher temperature and stores the heat energy. In the prior art, the electric heating elements arranged in the electric heating channel are generally in two types, namely a bare leaking spiral electric heating wire and an electric heating rod which is internally provided with high-purity magnesium oxide insulating material and externally provided with a metal sleeve, in the figure 2. There are problems in that: (1) the bare and leaked spiral heating wire is in direct contact with the solid electric heat storage material, the solid electric heat storage material has two performances of heat storage and insulation, the insulation performance is greatly reduced when the temperature of the general solid electric heat storage material exceeds 400-500 ℃, the solid electric heat storage material is frequently in a conductor short circuit at the temperature of 600-800 ℃ under high voltage, an electric heating element and the solid electric heat storage material are burnt and melted, and equipment damage accidents occur; (2) in the prior art, the heat storage material is generally magnesia bricks, the insulation performance of the magnesia bricks at high temperature mainly depends on the purity of magnesia, the manufacturing cost of the high-purity magnesia bricks is high, and the quality cannot be ensured due to the large amount of the heat storage material; (3) the electric heating rod internally provided with the high-purity magnesium oxide insulating material and externally provided with the metal sleeve electrically insulates and separates the electric heating element from the solid heat storage material, but the thermal resistance between the electric heating element and the solid heat storage material is greatly increased, the heat storage material is difficult to heat to a high temperature, and the electric heating rod body is often subjected to a fusing accident at the high temperature.
The method influences the maximum heat storage temperature of the solid electric heat storage furnace, limits the heat storage voltage grade and increases the heat storage cost.
Disclosure of Invention
The invention aims to provide an electric heating protective sleeve for a solid electric heat storage furnace, which is different from the prior art and is characterized in that: (1) the electric heating element is placed in an electric heating protective sleeve which is arranged in an electric heating channel, so that the scheme that a heat storage material is used as an insulating material and is directly installed in a contact mode or an electric heating rod with a metal sleeve outside in the prior art is replaced; (2) the electric heating protective sleeve consists of a ceramic tube and an insulating ring; (3) the electric heating element is installed in contact with the ceramic tube, and the ceramic tube is provided with a plurality of holes along the length direction, so that the heat dissipation of the electric heating element is facilitated. The ceramic tube can be made of high-purity alumina and other materials with high-temperature strength, certain high-temperature insulation performance and proper price, and mainly has the functions of high temperature resistance and isolation from solid heat storage materials; (4) the insulating rings are sleeved outside the ceramic tubes, more than two insulating rings are arranged along the length direction of the ceramic tubes to isolate the ceramic tubes from the solid heat storage material, the insulating rings mainly have the function of good insulation at high temperature, and the insulating rings can be made of special ceramic materials such as boron nitride and the like with good insulation performance at high temperature.
The core of the invention is: decoupling high voltage insulation and heat conduction problems at high temperatures. The ceramic tube in the electric heating protective sleeve is high-temperature resistant, the ceramic tube is provided with holes, the heat dissipation is good, but the high-temperature insulation performance is general, the material cost is lower, and the required quantity is large; the insulating ring in the electric heating protective sleeve has high-temperature insulating property and high material cost, but the required amount is small.
The invention has the advantages and effects that: (1) the highest heat storage temperature in the electric heat storage furnace is improved, so that the using amount of solid heat storage materials is greatly reduced, and the manufacturing cost of the electric heat storage furnace is reduced; (2) the solid heat storage material only considers the heat storage and high temperature resistance characteristics, common refractory materials, even cheap materials such as cobblestones and the like can be adopted, the insulating property of the heat storage material does not need to be considered, and the manufacturing cost of the electric heat storage furnace is greatly reduced; (3) the high-grade voltage electric-heat conversion can be adopted, so that the equipment cost such as voltage transformation and capacity increase and the operating cost such as line loss are reduced; (4) the service life and the reliability of the electric heating element are improved.
Drawings
FIG. 1 is a schematic diagram of the internal structure of a solid electric heat storage furnace, wherein 1 is an air duct; 2, heat storage bricks; 3 electric heating channels.
FIGS. 2 and 3 are schematic views of prior art electrocaloric channel electrocaloric element arrangements wherein 4: terminals; 5, wall head; 6 heating wire 7 metal tube 8 magnesia powder.
FIG. 4 is a schematic view of an embodiment of the electrothermal element in the electrothermal channel of the present invention; 9, ceramic tubes; 10 insulating ring.
Detailed Description
The technical solutions in the embodiments of the present invention are fully described below with reference to the embodiments shown in the drawings. The invention provides a novel electric heating element protective sleeve, which separates a bare electric leakage heating element and a solid heat storage material in an electric heating channel in the prior art and replaces the scheme of an electric heating rod which is internally provided with a high-purity magnesium oxide insulating material and externally provided with a metal sleeve in the prior art. The electrothermal protective sleeve provided by the invention consists of a ceramic tube and an insulating ring, and the structure of the electrothermal protective sleeve is shown in figure 3. The ceramic tube is provided with a plurality of holes along the length direction, the bare leakage heating element is sleeved in the ceramic tube, and the ceramic tube can be made of materials with proper price, such as high-purity alumina and the like. The ceramic tube has the functions of isolating the electric heating element from the heat storage material and has good heat dissipation performance, and the ceramic tube material is required to have high-temperature strength; the insulating rings are sleeved outside the ceramic tubes, more than two insulating rings are arranged along the length direction of the ceramic tubes to isolate the ceramic tubes from the solid heat storage material, the insulating rings mainly have the function of good insulation at high temperature, and the insulating rings can be made of special ceramic materials such as boron nitride and the like with good insulation performance at high temperature.
The invention decouples the problems of high voltage insulation and heat conduction at high temperature. The ceramic tube in the electric heating protective sleeve is high-temperature resistant, the ceramic tube is provided with holes, the heat dissipation is good, but the high-temperature insulation performance is general, the material cost is lower, and the required quantity is large; the insulating ring in the electric heating protective sleeve has high-temperature insulating property and high material cost, but the required amount is small.
The above description is only an embodiment of the present invention, but the protection scope of the present invention is not limited thereto. In the solid electric heat storage furnace, the technical scheme of the electric heating protective sleeve structure consisting of any high-temperature-resistant other ceramic material and an insulating ring with good insulating property at high temperature is within the protection scope of the invention.
Claims (4)
1. The invention places the electric heating element in the electric heating protective sleeve, and the electric heating protective sleeve is installed in the electric heating channel, thereby replacing the prior art that the heat storage material is used as the insulating material and is directly installed in contact with the insulating material.
2. The electrothermal protective sleeve of claim 1, wherein the electrothermal element is mounted in contact with the ceramic tube and the ceramic tube is perforated along its length.
3. The ceramic heat storage tube as claimed in claim 1, wherein the insulating ring is sleeved outside the ceramic tube, and the ceramic tube is isolated from the solid heat storage material by more than two insulating rings along the length direction of the ceramic tube, and mainly has the function of good insulation at high temperature, and the insulating ring can be made of special ceramic materials such as boron nitride and the like with good insulation performance at high temperature.
4. The core of the invention is to decouple the high voltage insulation and heat conduction problems at high temperature, the ceramic tube in the electric heating protective sleeve is high temperature resistant, and the ceramic tube is provided with holes to dissipate heat well, as stated in claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910947486.2A CN110726320A (en) | 2019-10-08 | 2019-10-08 | Electric heating protective sleeve for solid electric heat storage furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910947486.2A CN110726320A (en) | 2019-10-08 | 2019-10-08 | Electric heating protective sleeve for solid electric heat storage furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110726320A true CN110726320A (en) | 2020-01-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910947486.2A Pending CN110726320A (en) | 2019-10-08 | 2019-10-08 | Electric heating protective sleeve for solid electric heat storage furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110726320A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2382192Y (en) * | 1999-08-13 | 2000-06-07 | 李明文 | Heating unit for electric water heater |
| EP1282341A2 (en) * | 2001-07-30 | 2003-02-05 | Ngk Spark Plug Co., Ltd | Ceramic heater and method for manufacturing the same |
| CN103002612A (en) * | 2011-09-19 | 2013-03-27 | 中国科学院金属研究所 | Built-in porous heater |
| CN202859429U (en) * | 2012-10-10 | 2013-04-10 | 佛山市顺德区美美创新电器有限公司 | Electric heating hand warmer with ceramic electric heating substrate |
| JP2018073657A (en) * | 2016-10-31 | 2018-05-10 | 信越化学工業株式会社 | Heating element |
-
2019
- 2019-10-08 CN CN201910947486.2A patent/CN110726320A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2382192Y (en) * | 1999-08-13 | 2000-06-07 | 李明文 | Heating unit for electric water heater |
| EP1282341A2 (en) * | 2001-07-30 | 2003-02-05 | Ngk Spark Plug Co., Ltd | Ceramic heater and method for manufacturing the same |
| CN103002612A (en) * | 2011-09-19 | 2013-03-27 | 中国科学院金属研究所 | Built-in porous heater |
| CN202859429U (en) * | 2012-10-10 | 2013-04-10 | 佛山市顺德区美美创新电器有限公司 | Electric heating hand warmer with ceramic electric heating substrate |
| JP2018073657A (en) * | 2016-10-31 | 2018-05-10 | 信越化学工業株式会社 | Heating element |
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Application publication date: 20200124 |
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