CN115808094A - Radiant tube heating system - Google Patents
Radiant tube heating system Download PDFInfo
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- CN115808094A CN115808094A CN202111074734.0A CN202111074734A CN115808094A CN 115808094 A CN115808094 A CN 115808094A CN 202111074734 A CN202111074734 A CN 202111074734A CN 115808094 A CN115808094 A CN 115808094A
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- molten salt
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- heating system
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 58
- 150000003839 salts Chemical class 0.000 claims abstract description 110
- 238000012806 monitoring device Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000012546 transfer Methods 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 15
- 238000002844 melting Methods 0.000 description 10
- 230000008018 melting Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 230000005855 radiation Effects 0.000 description 7
- 239000002737 fuel gas Substances 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910001627 beryllium chloride Inorganic materials 0.000 description 1
- LWBPNIJBHRISSS-UHFFFAOYSA-L beryllium dichloride Chemical compound Cl[Be]Cl LWBPNIJBHRISSS-UHFFFAOYSA-L 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000003915 liquefied petroleum gas Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
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Abstract
The application discloses radiant tube heating system, this system includes: the system comprises a radiant tube, molten salt, a temperature monitoring device and a molten salt flow control device, wherein the molten salt is filled in the radiant tube; the radiant tube is provided with a molten salt inlet and a molten salt outlet; the molten salt flow control device is connected with the molten salt inlet; the temperature monitoring device is connected with the molten salt flow control device and used for transmitting the monitored temperature signal to the molten salt flow control device so that the molten salt flow control device can adjust the molten salt flow entering and exiting the radiant tube according to the temperature signal. The radiant tube heating system of the embodiment of the application prolongs the service life of the radiant tube; the flow of the molten salt is controlled by the molten salt flow control device, so that the heating temperature can be efficiently adjusted, and the heat transfer efficiency of the radiant tube is improved; the heating system has a simplified structure, relevant equipment such as a burner, a heat exchanger, a draught fan, an air blower and the like of a gas radiant tube are omitted, and the equipment investment cost is reduced.
Description
Technical Field
The application relates to the technical field of industrial heating, in particular to a radiant tube heating system.
Background
With the development of modern science and technology, people have higher and higher requirements on energy conservation, efficiency and service life of heating parts of the heating furnace. Radiant tubes are the primary heating elements that are widely used in furnaces. The currently used radiant tubes are mainly divided into two main categories: gas radiant tubes and electric radiant tubes.
The traditional gas radiant tube mainly comprises three parts: combustor, heat exchanger, radiant tube body. The gas radiant tube heats the tube wall through gas combustion in the tube, and then the tube wall heats the materials in a heat radiation mode. The specific working principle of the gas radiant tube is as follows: the combustor is installed in the gas input end of radiant tube, and the heat exchanger is installed to the tail gas exit end, and combustion gas carries out the combustion reaction with the air in inclosed pipeline, and burning flame heats the pipe wall with the form of heat radiation in the pipeline, and the burning waste gas flow direction exit end at last, and the cold air heating of new entering is passed through to waste gas again through the heat exchanger, saves the resource. The radiant tube is mainly composed of a radiant tube body, and the radiant tube body is easy to lose efficacy because the radiant tube body is in a high-temperature working environment for a long time due to the fact that heating is carried out through tube body radiation. The failure reasons of the radiant tube body mainly include: 1) Local long-time burning and oxidation; 2) The tube body has a larger temperature drop in the length direction, so that the tube body is subjected to larger thermal stress; 3) The explosion of the gas flow generated during the combustion chemical reaction causes the radiant tube to vibrate continuously.
The traditional electric radiation tube is a high-temperature-resistant stainless steel tube, a heating element in the radiation tube is a heating body consisting of a plurality of resistance wires, the resistance wire heating body consists of a plurality of resistance wires and insulators for serial insertion and isolation, and heat generated after the resistance wire heating body is electrified firstly radiates heat to the outside through the radiation tube, so that the heat energy of a heating component is consumed firstly; secondly, heat is concentrated in the radiant tube, which affects the service life of the whole radiant tube. Meanwhile, the traditional electric radiant tube is hollow, so that the heat capacity of gas is small, the heating state of the heating body assembly needs to be frequently switched, and the electric radiant tube is easy to heat and lose efficacy.
Disclosure of Invention
The object of the present application is to solve at least to some extent one of the above mentioned technical problems.
Therefore, a first objective of the present application is to provide a radiant tube heating system, which can prolong the service life of the radiant tube, improve the heat transfer efficiency of the radiant tube, and reduce the equipment investment cost.
In order to achieve the above object, an embodiment of the first aspect of the present application provides a radiant tube heating system, including:
a radiant tube, fused salt, a temperature monitoring device and a fused salt flow control device,
wherein the molten salt is filled in the interior of the radiant tube;
the radiant tube is provided with a molten salt inlet and a molten salt outlet;
the molten salt flow control device is connected with the molten salt inlet;
the temperature monitoring device is connected with the molten salt flow control device and used for transmitting the monitored temperature signal to the molten salt flow control device, so that the molten salt flow control device adjusts the molten salt flow entering and exiting the radiant tube according to the temperature signal.
Optionally, the temperature monitoring device comprises a temperature measuring part and a temperature signal transmitter,
the temperature measuring part is connected with the temperature signal transmitter;
the temperature measuring part is used for monitoring the temperature inside, on the surface or outside the radiant tube;
the temperature transmitter is used for transmitting the temperature signal.
Optionally, the measuring point of the temperature measuring part is arranged in the radiant tube, a conveying pipeline of the molten salt inlet or the molten salt outlet, the surface of the radiant tube or a heating environment outside the radiant tube.
Optionally, the temperature monitoring device and the molten salt flow control device are arranged outside the radiant tube.
Optionally, the selection factor of the molten salt includes at least one of a heating load of the radiant tube, a physical and chemical property of the molten salt itself, and a material of the radiant tube.
Optionally, the molten salt is a single molten salt or a composite molten salt.
Optionally, the molten salt flow control device comprises a valve, a molten salt pump, or a combination thereof.
Optionally, the operating temperature range of the radiant tube is 200-1200 ℃.
Optionally, the molten salt inlet and the molten salt outlet are arranged on the surface of the radiant tube.
Optionally, the shape of the radiant tube is one of an I-shape, a U-shape, a P-shape and a W-shape.
According to the radiant tube heating system, the existing fuel gas heating is replaced by molten salt heat exchange, so that the use of fuel gas can be reduced, and the service life of the radiant tube is prolonged; the flow of the fused salt is controlled by the fused salt flow control device, so that the heating temperature can be efficiently adjusted, and the heat transfer efficiency of the radiant tube is improved; the heating system has a simplified structure, relevant equipment such as a burner, a heat exchanger, a draught fan, an air blower and the like of a gas radiant tube are omitted, and the equipment investment cost is reduced.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
FIG. 1 is a schematic diagram of a radiant tube heating system according to one embodiment of the present application;
FIG. 2 is a schematic structural view of a radiant tube heating system according to another embodiment of the present application;
fig. 3 is a schematic structural view of a radiant tube heating system according to yet another embodiment of the present application.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The present application is described in further detail below with reference to specific examples, which should not be construed as limiting the scope of the invention as claimed.
In the existing radiant tube heating system, there are several problems: 1) Local long-time burning and oxidation; 2) The tube body has a larger temperature drop in the length direction, so that the tube body is subjected to larger thermal stress; 3) The blast of the airflow generated in the process of combustion chemical reaction enables the radiant tube to vibrate continuously; 4) The residual heat of the flue gas can not be completely used. Therefore, the application provides a radiant tube heating system, the existing fuel gas heating is replaced by molten salt heat exchange, the use of fuel gas, especially the use of natural gas or liquefied petroleum gas, can be reduced, and the use cost is reduced; the structure of the heating system is simplified, relevant equipment such as a burner, a heat exchanger, a draught fan, an air blower and the like of a gas radiant tube are omitted, and the equipment investment cost is reduced; the problems that the unit area heat load of the existing electric radiant tube is low, the heat transfer temperature difference is large, the heat transfer thermal resistance is large, the heating element frequently switches the heating state, so that the radiant tube is easy to lose efficacy and the like are solved.
The radiant tube heating system of the embodiments of the present application is described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a radiant tube heating system according to an embodiment of the present application.
As shown in fig. 1, the radiant tube heating system includes a radiant tube 1, molten salt 2, a temperature monitoring device 3, and a molten salt flow control device 4.
The molten salt 2 is filled in the radiant tube 1. The molten salt 2 heats the radiant tube 1 by the carried heat, and then the heat is transferred to the space around the radiant tube 1 through the radiant tube 1. Filling the molten salt 2 inside the radiant tube 1 makes it possible to transfer heat to the body of the radiant tube 1 by means of radiation and conduction (mainly by means of conduction), so that the radiant tube 1 can be maintained at a suitable temperature.
The radiant tube 1 is provided with a molten salt inlet 11 and a molten salt outlet 12. The molten salt inlet 11 and the molten salt outlet 12 are provided on the surface of the radiant tube 1. For example, a molten salt inlet 11 and a molten salt outlet 12 shown in fig. 1 are provided at both ends of the radiant tube 1, respectively. The molten salt flow control device 4 is connected to the molten salt inlet 11. The temperature monitoring device 3 is connected with the molten salt flow control device 4. The temperature monitoring device 3 can transmit the monitored temperature signal to the molten salt flow control device 4, and the molten salt flow control device 4 can adjust the flow of the molten salt entering and exiting the radiant tube 1 according to the temperature signal, namely, control the flow of the molten salt 2 flowing in from the molten salt inlet 11 and flowing out from the molten salt outlet 12. Wherein the temperature monitoring device 3 and the molten salt flow control device 4 are both arranged outside the radiant tube 1.
Further, the temperature monitoring device 3 includes a temperature measuring member 31 and a temperature signal transmitter 32.
The temperature measuring member 31 is connected to the temperature signal transmitter 32. The temperature measuring unit 31 is used to monitor the internal temperature, the surface temperature, and the external temperature of the radiant tube 1. Specifically, as shown in fig. 1, when the measuring point of the temperature measuring device 31 is disposed inside the radiant tube 1, the internal temperature of the radiant tube 1 is monitored. When the measuring point of the temperature measuring part 31 is arranged on the conveying pipeline of the molten salt inlet 11 or the molten salt outlet 12, the surface temperature of the radiant tube 1 is monitored. For example, as shown in fig. 2, the measurement point of the temperature measuring member 31 is disposed on the surface of the radiant tube 1 near the molten salt outlet 12. As shown in fig. 3, when the measuring point of the temperature measuring member 31 is disposed in the heated environment outside the radiant tube 1, the outside temperature of the radiant tube 1 is monitored.
After obtaining the above temperature, the temperature transmitter 32 transmits the monitored temperature signal to the molten salt flow control device 4, and the flow rate of the molten salt 2 is adjusted by the molten salt flow control device 4. Wherein the molten salt flow control device 4 may further comprise a valve, a molten salt pump, or a combination thereof. Specifically, the molten salt flow control device 4 may convert the received temperature signal into an electrical signal, and then control the opening of the valve based on the electrical signal, or control the power of the molten salt pump, or simultaneously control the combination of the valve and the molten salt pump to realize the adjustment of the molten salt flow.
The type of the molten salt can be selected according to factors such as the heating load of the radiant tube 1, the physical and chemical properties of the molten salt 2, the material of the radiant tube 1 body and the like. Specifically, a single molten salt or a composite molten salt having strong corrosion resistance, good thermal stability, low steam pressure, and a wide operating temperature range may be selected. The molten salt 2 can be classified into two categories according to whether it is heated above the melting point: the first type is a covalent compound molten salt which can be heated to a melting point or above, and representatives are BeCl2, alCl3, hgCl2, znCl2 and the like. The second type is a molten salt that can satisfy the heat storage requirement without being heated above the melting point, and typically includes SiO2, al2O3, etc., and only satisfies the heat storage and heat conduction requirements.
The dimensions of the radiant tube 1 can be selected according to the size of the heating load and the temperature to be reached. For example, standard radiant tubes with different diameters of DN 100-DN 250 can be selected, and the pipeline is made of high-temperature-resistant alloy steel. The highest temperature that the radiant tube 1 can withstand is selected according to the temperature that the radiant tube 1 needs to reach, and the temperature that the radiant tube 1 needs to reach can be higher than the melting point of the molten salt 2 or lower than the melting point of the molten salt 2. The material is selected according to the temperature to be reached and the highest temperature to be endured by the radiant tube 1, and materials such as ZG35Cr24Ni7SiNRe, ZG30Cr25Ni12Si2NRe, ZG40Cr25Ni20Si2 and the like can be selected. The shape of the radiant tube 1 can be selected from I-shaped, U-shaped, P-shaped, W-shaped and other different forms.
The radiant tube adopting the fused salt for heat exchange can realize the temperature operation at a wider temperature range of 200-1200 ℃ or even higher according to the requirements of the working temperature and the working load. It is limited only by the radiant tube itself, such as HTS melting point 142 ℃, naBF4-NaF melting point 384 ℃, FLiNaK melting point 454 ℃, siO2 melting point 1723 ℃, al2O3 melting point 2050 ℃, can meet various industrial heating requirements.
Because the specific heat and the heat conductivity coefficient of the fused salt are larger than those of smoke and air with the same volume, the working curve of the radiant tube based on fused salt heat exchange is smoother and less fluctuant than those of a gas radiant tube and an electric radiant tube. Meanwhile, the heat conductivity coefficient is high and the efficiency is high. In addition, compared with a gas radiant tube, the gas radiant tube has the advantages of lower operation cost, no need of equipment such as an air blower, an induced draft fan, a chimney and the like, and low equipment investment cost.
According to the radiant tube heating system, the existing fuel gas heating is replaced by molten salt heat exchange, so that the use of fuel gas can be reduced, and the service life of the radiant tube is prolonged; the flow of the molten salt is controlled by the molten salt flow control device, so that the heating temperature can be efficiently adjusted, and the heat transfer efficiency of the radiant tube is improved; the heating system has a simplified structure, relevant equipment such as a burner, a heat exchanger, a draught fan, an air blower and the like of a gas radiant tube are omitted, and the equipment investment cost is reduced.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a component of' 8230; \8230;" does not exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It should be noted that in the description of the present specification, reference to the description of the term "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Claims (10)
1. A radiant tube heating system, comprising: a radiant tube, fused salt, a temperature monitoring device and a fused salt flow control device,
wherein the molten salt is filled in the interior of the radiant tube;
the radiant tube is provided with a molten salt inlet and a molten salt outlet;
the molten salt flow control device is connected with the molten salt inlet;
the temperature monitoring device is connected with the molten salt flow control device and used for transmitting the monitored temperature signal to the molten salt flow control device, so that the molten salt flow control device can adjust the molten salt flow entering and exiting the radiant tube according to the temperature signal.
2. A radiant tube heating system as in claim 1 wherein said temperature monitoring means comprises a temperature measuring member, a temperature signal transmitter,
the temperature measuring part is connected with the temperature signal transmitter;
the temperature measuring part is used for monitoring the temperature inside, on the surface or outside the radiant tube;
the temperature transmitter is used for transmitting the temperature signal.
3. A radiant tube heating system as claimed in claim 2 wherein the measuring point of said temperature measuring means is provided within the radiant tube, a conduit for the molten salt inlet or outlet, the radiant tube surface or the heated environment outside the radiant tube.
4. A radiant tube heating system as claimed in claim 1 wherein said temperature monitoring means and said molten salt flow control means are provided externally of said radiant tube.
5. A radiant tube heating system as claimed in claim 1 wherein the molten salt selection factors include at least one of the heating load of the radiant tube, the physical and chemical properties of the molten salt itself and the material of the radiant tube.
6. A radiant tube heating system as claimed in claim 1 wherein the molten salt is a single molten salt or a composite molten salt.
7. A radiant tube heating system as claimed in claim 1 wherein said molten salt flow control means comprises a valve, a molten salt pump or combinations thereof.
8. A radiant tube heating system as claimed in claim 1 wherein said radiant tube operates at a temperature in the range of 200 to 1200 ℃.
9. A radiant tube heating system as claimed in claim 1 wherein said molten salt inlet and said molten salt outlet are provided at the surface of said radiant tube.
10. A radiant tube heating system as claimed in any of claims 1 to 9 wherein said radiant tube is one of I-shaped, U-shaped, P-shaped, W-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111074734.0A CN115808094A (en) | 2021-09-14 | 2021-09-14 | Radiant tube heating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111074734.0A CN115808094A (en) | 2021-09-14 | 2021-09-14 | Radiant tube heating system |
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| CN115808094A true CN115808094A (en) | 2023-03-17 |
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| CN202111074734.0A Pending CN115808094A (en) | 2021-09-14 | 2021-09-14 | Radiant tube heating system |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN206431473U (en) * | 2016-10-18 | 2017-08-22 | 沧州四星光热玻璃有限公司 | A kind of evaporator of energy controlled medium flow |
| CN109489023A (en) * | 2017-09-11 | 2019-03-19 | 甘肃光热发电有限公司 | Photo-thermal electricity high-efficiency steam generating system and control method |
| CN208765550U (en) * | 2018-07-20 | 2019-04-19 | 常州索拉尔熔盐泵阀科技有限公司 | A kind of double tank power generation molten salt energy storage systems |
| CN110388683A (en) * | 2019-06-20 | 2019-10-29 | 西安交通大学 | A kind of low ebb electric-heating heat-conductive oil and fused salt composite heat storage heating system and its method |
| CN111256375A (en) * | 2020-03-23 | 2020-06-09 | 东莞理工学院 | Heat transfer pipe for molten salt fluid and heat absorber thereof |
| CN213178515U (en) * | 2020-08-20 | 2021-05-11 | 常州能源设备总厂有限公司 | Molten salt central heating device |
-
2021
- 2021-09-14 CN CN202111074734.0A patent/CN115808094A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206431473U (en) * | 2016-10-18 | 2017-08-22 | 沧州四星光热玻璃有限公司 | A kind of evaporator of energy controlled medium flow |
| CN109489023A (en) * | 2017-09-11 | 2019-03-19 | 甘肃光热发电有限公司 | Photo-thermal electricity high-efficiency steam generating system and control method |
| CN208765550U (en) * | 2018-07-20 | 2019-04-19 | 常州索拉尔熔盐泵阀科技有限公司 | A kind of double tank power generation molten salt energy storage systems |
| CN110388683A (en) * | 2019-06-20 | 2019-10-29 | 西安交通大学 | A kind of low ebb electric-heating heat-conductive oil and fused salt composite heat storage heating system and its method |
| CN111256375A (en) * | 2020-03-23 | 2020-06-09 | 东莞理工学院 | Heat transfer pipe for molten salt fluid and heat absorber thereof |
| CN213178515U (en) * | 2020-08-20 | 2021-05-11 | 常州能源设备总厂有限公司 | Molten salt central heating device |
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