CN114234160A - Hot rolled steel waste heat recovery system and method based on phase change control - Google Patents
Hot rolled steel waste heat recovery system and method based on phase change control Download PDFInfo
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- CN114234160A CN114234160A CN202111419885.5A CN202111419885A CN114234160A CN 114234160 A CN114234160 A CN 114234160A CN 202111419885 A CN202111419885 A CN 202111419885A CN 114234160 A CN114234160 A CN 114234160A
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- salt
- salt solution
- rolled steel
- temperature
- salt bath
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 69
- 239000010959 steel Substances 0.000 title claims abstract description 69
- 239000002918 waste heat Substances 0.000 title claims abstract description 32
- 238000011084 recovery Methods 0.000 title claims abstract description 26
- 230000008859 change Effects 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 16
- 150000003839 salts Chemical class 0.000 claims abstract description 72
- 239000012266 salt solution Substances 0.000 claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 230000007704 transition Effects 0.000 claims description 9
- 230000009466 transformation Effects 0.000 claims description 6
- 238000005098 hot rolling Methods 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 229910000658 steel phase Inorganic materials 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 3
- 238000010168 coupling process Methods 0.000 claims 3
- 238000005859 coupling reaction Methods 0.000 claims 3
- 238000004064 recycling Methods 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 description 4
- 229910001562 pearlite Inorganic materials 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000047 product Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910001563 bainite Inorganic materials 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 150000002823 nitrates Chemical class 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical group OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 150000003841 chloride salts Chemical class 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 235000010333 potassium nitrate Nutrition 0.000 description 1
- 239000004323 potassium nitrate Substances 0.000 description 1
- 239000010819 recyclable waste Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/06—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being molten; Use of molten metal, e.g. zinc, as heat transfer medium
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention particularly relates to a hot-rolled steel waste heat recovery system and a waste heat recovery method based on phase change control. The method comprises the steps that heat of hot rolled steel is absorbed by salt solution after the hot rolled steel enters a salt bath, the temperature of the salt solution is increased after the salt solution absorbs the heat and is sent to an evaporator through a molten salt pump, the salt solution and water which is input to a deaerator through a water pump and is treated realize forced circulation heat exchange, the temperature of the salt solution is reduced to the temperature required by the phase change of the steel after the heat exchange of the salt solution and is sent back to the salt bath, the hot rolled steel is subjected to the phase change in the salt bath, the water is converted into medium-pressure steam after the heat exchange of the water and the salt solution in the evaporator, and the waste heat recycling is realized.
Description
Technical Field
The invention relates to the technical field of hot rolled steel waste heat recovery, in particular to a hot rolled steel waste heat recovery system and a waste heat recovery method based on phase change control.
Background
The carbon emission amount of the steel industry in China accounts for about 14% of the total carbon emission amount of China, and the low-carbon high-energy-efficiency green development of the steel industry has great significance for realizing the double-carbon target in China. For long-process steel enterprises, about 34% of the energy input into the process is converted into various residual heats. Most processes in the long-flow steel industry, such as sintering, coking, ironmaking, steelmaking and the like, have mature technical schemes in the aspect of waste heat recovery, and hot rolling processes, particularly hot rolled steel, contain waste heat resources which are not ideal in a recovery mode. The temperature of the steel after hot rolling is about 900 ℃, the carried waste heat energy is about 19.12kg/t (converted into coal), the hot rolled steel is generally cooled in the air at present, and the heat such as sensible heat, phase change latent heat and the like contained in the red hot steel is dissipated into the air, so that the waste is wasted and the working environment is deteriorated. The prior art assumes that air is directly utilized for heat recovery, the mode needs to be provided with a high-power fan for forced circulation to take away large heat, the equipment is difficult to seal, the air leakage is serious, the required natural air volume is large, most of the temperature after heat exchange is low, the loss is large, the requirement on subsequent dust removal equipment is high, and the industrial application cannot be realized.
The difficulty of recovering the waste heat of the hot rolled steel is that besides taking away and utilizing the heat of the steel in a proper mode, the cooling process of the steel must be controlled in the process so that the steel is subjected to phase change as required, and proper structure performance is obtained to meet the final application of the steel. If only the rest heat resources are recycled, but the product performance of the steel is neglected, the steel is obviously inverted at the end and cannot be implemented.
Disclosure of Invention
The invention aims to provide a hot-rolled steel waste heat recovery system and a waste heat recovery method based on phase change control, which can ensure that steel can obtain proper structure performance and can recycle waste heat resources contained in the steel.
The invention provides a hot-rolled steel waste heat recovery system based on phase change control, which comprises a salt bath, a molten salt pump, an evaporator, a deaerator and a water pump, wherein a salt solution outlet of the salt bath is connected with a salt solution inlet of the evaporator through a first pipeline, the molten salt pump is arranged on the first pipeline, the salt solution inlet of the salt bath is connected with a salt solution outlet of the evaporator through a second pipeline, the deaerator is connected with a water inlet of the evaporator through a third pipeline, the water pump is arranged on the third pipeline, and a steam outlet of the evaporator is connected with a fourth pipeline.
Preferably, a conveying roller way is arranged in the salt bath and extends to the outside of the salt bath.
Preferably, the salt bath temperature is set to be 150-580 ℃, and the temperature difference between the salt solution inlet and the salt solution outlet of the evaporator is set to be 50-200 ℃.
Preferably, the molten salt pump is a variable frequency pump, the total amount of the salt solution participating in heat exchange is calculated according to the yield and the temperature difference of the hot-pressed steel and the temperature difference of the salt solution at the inlet and the outlet of the evaporator, and then the frequency of the molten salt pump is adjusted within a proper range so as to maintain the temperature change of the salt bath at 3-5 ℃.
Preferably, the water pump is a variable frequency pump, the total amount of water participating in heat exchange is calculated according to the yield and the temperature difference of the hot-pressed steel and the temperature of the evaporator water, and then the frequency of the water pump is adjusted within a proper range so as to maintain the temperature change of the salt bath at 3-5 ℃.
The invention also provides a hot rolled steel waste heat recovery method, which comprises the following steps: the heat is absorbed by the salt solution behind the hot rolled steel gets into the salt bath, the salt solution absorbs the heat after the temperature risees and send into the evaporimeter by the molten salt pump, and realize the forced circulation heat transfer with the water that imports the oxygen-eliminating device through the water pump and handle, the salt solution heat transfer after-mentioned temperature reduction is sent back the salt bath to make salt bath temperature maintain in the required temperature range of steel phase transition, the hot rolled steel takes place the phase transition in the salt bath, water turns into middling pressure steam with salt solution heat transfer after in the evaporimeter, realize waste heat recovery and utilize.
Compared with the prior art, the invention has the beneficial effects that:
the good heat exchange and heat storage capacity of the salt bath are utilized to simultaneously realize the phase change control and waste heat recovery of the hot rolled steel, and the good heat exchange capacity enables the salt bath to rapidly cool the red hot rolled steel to the phase change temperature and realize constant temperature change, thereby ensuring that the steel has excellent organization performance and meeting the use requirement; the salt bath can be kept stable in a large temperature window, so that the heat contained in the red hot steel is stored and transferred to other media for utilization; this patent utilizes the characteristic of salt bath to realize hot rolled steel's waste heat recovery, utilizes waste heat resource to change water into high-quality middling pressure steam and utilizes.
Drawings
FIG. 1 is a schematic diagram of a waste heat recovery system for hot rolled steel based on phase change control according to the present invention;
FIG. 2 is a photograph of the microstructure of the hot-rolled steel of the present invention obtained after completion of the treatment in the salt bath.
The figure is marked with: salt bath 1, molten salt pump 2, evaporator 3, deaerator 4, water pump 5, first pipeline 6, second pipeline 7, third pipeline 8, fourth pipeline 9, transportation roller table 10, laying head 11.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
Referring to fig. 1, the hot-rolled steel waste heat recovery system based on phase change control provided in this embodiment includes a salt bath 1, a molten salt pump 2, an evaporator 3, an oxygen remover 4, and a water pump 5, a salt solution outlet of the salt bath 1 is connected to a salt solution inlet of the evaporator 3 through a first pipeline 6, the molten salt pump 2 is disposed on the first pipeline 6, a salt solution inlet of the salt bath 1 is connected to a salt solution outlet of the evaporator 3 through a second pipeline 7, the molten salt pump 2 is used for circulation of a salt solution between the salt bath 1 and the evaporator 3, the salt solution is conveyed into the evaporator 3 for heat exchange and the salt solution after heat exchange returns to the salt bath 1, the oxygen remover 4 is connected to a water inlet of the evaporator 3 through a third pipeline 8, the water pump 5 is disposed on the third pipeline 8, a steam outlet of the evaporator 3 is connected to a fourth pipeline 9, the water pump 5 is used for circulation of water, the water pump 5 pumps the water into the evaporator 3 for heat exchange of the salt solution, the heated water changes phase into medium-pressure steam, the pressure of the medium-pressure steam is more than or equal to 4.5Mpa, the medium-pressure steam is output to the evaporator 3 through the fourth pipeline 9, the medium-pressure steam can be used for power generation and other purposes, and finally the waste heat recovery of the hot rolled steel is realized.
As a preferred embodiment of this embodiment, a transport table 10 is disposed in the salt bath 1, and the transport table 10 extends to the outside of the salt bath 1. The transportation roller table 10 is used for transporting hot rolled steel, the hot rolled steel is rolled by the laying head 11, the red hot rolled steel at about 900 ℃ continuously enters the salt bath 1 at a yield of 100t/h, and the hot rolled steel finally needs to obtain a fine pearlite structure, so that the salt solution of the embodiment adopts molten nitrate formed by mixing and melting sodium nitrate and potassium nitrate, the temperature of the salt bath is set to be 500 ℃, the salt bath passes through the salt bath 1 according to the time of technological requirements, the hot rolled steel completing phase change in the salt bath 1 continuously enters the next procedure through the transportation roller table 10, and a microstructure photo of the hot rolled steel completing phase change in the salt bath 1 is shown in fig. 2, so that the steel is seen to be all fine pearlite (sorbite) structures, small in size, uniform in distribution and more excellent than the steel structure obtained by traditional air cooling. The using temperature of the molten nitrate salt solution is 150-580 ℃, the phase transformation requirements of pearlite, bainite, martensite and mixed structures of different steel products can be met, and if bainite or martensite structure steel products are produced, the salt bath temperature can be respectively reduced to be below 400 ℃ and 200 ℃, so that the recyclable waste heat resources and the generated energy are more. The salt solution can also adopt carbonate, chloride salt and the like according to other phase transition temperature requirements. By properly modifying auxiliary mechanical equipment such as the conveying roller way 10 and the like, the waste heat recovery system can be applied to waste heat recovery of hot rolled steel, steel casting blanks and the like in various shapes such as bars, sections, plate strips and the like.
In a preferred embodiment of this embodiment, the temperature of the salt bath 1 is set to 150 to 580 ℃, the molten nitrate salt bath is used in this embodiment, the temperature is set to 500 ℃, and the temperature difference between the inlet and outlet of the salt bath of the evaporator 3 is set to 50 ℃.
As a preferred embodiment of this embodiment, the molten salt pump 2 is a variable frequency pump, and the total amount of the salt solution participating in heat exchange is calculated according to the output and temperature difference of the hot-pressed steel and the temperature difference of the salt solution at the inlet and the outlet of the evaporator 3, so as to adjust the frequency of the molten salt pump 2 in a proper range to maintain the temperature change of the salt bath 1 at 3-5 ℃.
As a preferred embodiment of this embodiment, the water pump 5 is an inverter pump, and the total amount of water participating in heat exchange is calculated according to the output of hot-pressed steel, the temperature difference, and the water temperature of the evaporator 3, and then the frequency of the water pump 5 is adjusted within a suitable range to maintain the temperature change of the salt bath 1 at 3-5 ℃.
The embodiment also provides a method for recovering the waste heat of the hot rolled steel, which comprises the following steps: the hot rolled steel gets into salt bath 1 from laying head 11 after the heat is absorbed by the salt solution, the salt solution absorbs behind the heat temperature rise and send into evaporimeter 3 by molten salt pump 2, with the water of inputing to oxygen-eliminating device 4 through water pump 5 and through the forced circulation heat transfer, the salt solution heat transfer after the temperature reduce to the required temperature of steel phase transition and send back salt bath 1, hot rolled steel relies on the good heat conduction characteristic of salt bath to cool off fast to phase transition temperature and carry out the constant temperature phase transition, water turns into middling pressure steam after the salt solution heat transfer in evaporimeter 3, realize waste heat recovery and utilize. Calculated according to 50 ten thousand tons of fine pearlite wire rods produced by the high-speed wire rod every year, 21600 tons of 4.5MPa260 ℃ saturated steam byproducts can be produced, the steam pressure difference is recovered and converted into electric energy, the power generation is about 388.08 ten thousand KW, the industrial electricity consumption is 0.75 yuan/KW, and 291 ten thousand yuan is gained each year.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a hot rolling steel waste heat recovery system based on control phase transition which characterized in that: including salt bath, molten salt pump, evaporimeter, oxygen-eliminating device and water pump, the salt solution export of salt bath is through the salt solution import of first tube coupling evaporimeter, the molten salt pump sets up on first tube way, the salt solution import of salt bath passes through the salt solution export of second tube coupling evaporimeter, the oxygen-eliminating device passes through the water intlet of third tube coupling evaporimeter, the water pump sets up on the third tube way, the steam outlet of evaporimeter connects the fourth pipeline.
2. The system for recovering the residual heat of the hot-rolled steel based on the controlled phase transformation as claimed in claim 1, wherein: and a transport roller way is arranged in the salt bath and extends to the outside of the salt bath.
3. The system for recovering the residual heat of the hot-rolled steel based on the controlled phase transformation as claimed in claim 1, wherein: the salt bath temperature is set to be 150-580 ℃, and the temperature difference between the salt solution inlet and the salt solution outlet of the evaporator is set to be 50-200 ℃.
4. The system for recovering the residual heat of the hot-rolled steel based on the controlled phase transformation as claimed in claim 3, wherein: the molten salt pump is a variable frequency pump, the total amount of the salt solution participating in heat exchange is calculated according to the output and the temperature of the hot-pressed steel and the temperature difference of the salt solution at the inlet and the outlet of the evaporator, and then the frequency of the molten salt pump is adjusted within a proper range so as to maintain the temperature change of the salt bath at 3-5 ℃.
5. The system for recovering the residual heat of the hot-rolled steel based on the controlled phase transformation as claimed in claim 3, wherein: the water pump is a variable frequency pump, the total amount of water participating in heat exchange is calculated according to the yield of hot-pressed steel, the temperature difference and the temperature of the evaporator water, and then the frequency of the water pump is adjusted within a proper range so as to maintain the temperature change of the salt bath at 3-5 ℃.
6. A waste heat recovery method using the system for recovering waste heat of hot rolled steel based on phase transformation control according to claim 1, wherein the method comprises: the heat is absorbed by the salt solution after hot rolled steel gets into the salt bath, the salt solution absorbs the heat after the temperature risees and is sent into the evaporimeter by the molten salt pump, realize the forced circulation heat transfer with the water of inputing to the oxygen-eliminating device through the water pump through the oxygen-eliminating device through the processing, the salt solution heat transfer, the salt bath is sent back to after the temperature reduction, so that salt bath temperature is stabilized in the required temperature range of steel phase transition, hot rolled steel takes place the phase transition in the salt bath, obtain ideal micro-structure and performance, water turns into middling pressure steam with the salt solution heat transfer in the evaporimeter, realize waste heat recovery and utilize.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111419885.5A CN114234160A (en) | 2021-11-26 | 2021-11-26 | Hot rolled steel waste heat recovery system and method based on phase change control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111419885.5A CN114234160A (en) | 2021-11-26 | 2021-11-26 | Hot rolled steel waste heat recovery system and method based on phase change control |
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| CN114234160A true CN114234160A (en) | 2022-03-25 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5592890A (en) * | 1978-12-28 | 1980-07-14 | Hitachi Zosen Corp | Method of recovering heat from inorganic salt-containing waste liquid |
| WO2010138597A2 (en) * | 2009-05-26 | 2010-12-02 | Worleyparsons Group, Inc. | Waste heat recovery system |
| CN102808668A (en) * | 2012-08-28 | 2012-12-05 | 无锡市东方环境工程设计研究所有限公司 | Continuous-casting two-cooling-section waste heat power generation method and equipment based on organic working medium Rankine cycle |
| CN105552406A (en) * | 2016-01-14 | 2016-05-04 | 贵阳铝镁设计研究院有限公司 | Heat energy utilization method and device for power generation through molten-salt batteries employing flue gas waste heat |
| CN208475309U (en) * | 2018-07-11 | 2019-02-05 | 北京京诚科林环保科技有限公司 | Fused salt heat accumulating type steam superheating device and system |
| CN110057201A (en) * | 2019-03-27 | 2019-07-26 | 北京岠匠科技有限责任公司 | Band energy storage efficient waste heat recycling system |
| CN110220388A (en) * | 2019-03-27 | 2019-09-10 | 北京中冶设备研究设计总院有限公司 | A kind of converter gas waste heat recovery device and method |
| CN112985139A (en) * | 2021-02-25 | 2021-06-18 | 中国重型机械研究院股份公司 | Molten salt constant temperature system and use method thereof |
-
2021
- 2021-11-26 CN CN202111419885.5A patent/CN114234160A/en not_active Withdrawn
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5592890A (en) * | 1978-12-28 | 1980-07-14 | Hitachi Zosen Corp | Method of recovering heat from inorganic salt-containing waste liquid |
| WO2010138597A2 (en) * | 2009-05-26 | 2010-12-02 | Worleyparsons Group, Inc. | Waste heat recovery system |
| US20100319348A1 (en) * | 2009-05-26 | 2010-12-23 | Worleyparsons Group, Inc. | Waste heat recovery system |
| CN102808668A (en) * | 2012-08-28 | 2012-12-05 | 无锡市东方环境工程设计研究所有限公司 | Continuous-casting two-cooling-section waste heat power generation method and equipment based on organic working medium Rankine cycle |
| CN105552406A (en) * | 2016-01-14 | 2016-05-04 | 贵阳铝镁设计研究院有限公司 | Heat energy utilization method and device for power generation through molten-salt batteries employing flue gas waste heat |
| CN208475309U (en) * | 2018-07-11 | 2019-02-05 | 北京京诚科林环保科技有限公司 | Fused salt heat accumulating type steam superheating device and system |
| CN110057201A (en) * | 2019-03-27 | 2019-07-26 | 北京岠匠科技有限责任公司 | Band energy storage efficient waste heat recycling system |
| CN110220388A (en) * | 2019-03-27 | 2019-09-10 | 北京中冶设备研究设计总院有限公司 | A kind of converter gas waste heat recovery device and method |
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