CN212902702U - Steelmaking converter flue gas waste heat recovery system - Google Patents
Steelmaking converter flue gas waste heat recovery system Download PDFInfo
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- CN212902702U CN212902702U CN202021803526.0U CN202021803526U CN212902702U CN 212902702 U CN212902702 U CN 212902702U CN 202021803526 U CN202021803526 U CN 202021803526U CN 212902702 U CN212902702 U CN 212902702U
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- flue gas
- fused salt
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The utility model provides a steelmaking converter flue gas waste heat recovery system, including flue gas pipeline, cyclone dust collector, two-stage particle dust collector, ceramic formula flue gas fused salt heat exchanger, cold fused salt storage tank, hot fused salt storage tank and fused salt steam heat transfer device, last cyclone dust collector, two-stage particle dust collector, the ceramic formula flue gas fused salt heat exchanger of having set gradually of flue gas pipeline, the fused salt entry of ceramic formula flue gas fused salt heat exchanger and the exit linkage of cold fused salt storage tank, the fused salt export of ceramic formula flue gas fused salt heat exchanger respectively with the entry linkage of cold fused salt storage tank, hot fused salt storage tank, the export of hot fused salt storage tank pass through fused salt steam heat transfer device with the entry linkage of cold fused salt storage tank. The utility model discloses utilize ceramic formula flue gas fused salt heat exchanger to accomplish the waste heat recovery storage process of high temperature flue gas, the high temperature fused salt produces superheated steam through exchanging heat with water, gets into the power generation of terminal generator of steam turbine drive.
Description
Technical Field
The utility model belongs to the waste heat recovery field, in particular to steelmaking converter flue gas waste heat recovery system.
Background
The furnace gas temperature of the steel-making converter leaving the furnace mouth is 1450-. The waste heat of the flue gas below the temperature is cooled by water spraying no matter in a wet method, semi-dry method or dry method dust removal process, so that not only is a large amount of waste heat wasted, but also the energy of the water spraying is consumed.
The existing evaporation flue cooling system has the defects that the fluctuation of parameters such as flue gas temperature, flow and composition is large, the intermittent waste heat is generated, high-quality steam with high temperature and high pressure is difficult to generate, only a low-parameter saturated steam turbine can be adopted for power generation, the power generation efficiency is low, the operation mode can only fix the steam quantity by the waste heat, the power output cannot be flexibly adjusted, and the power peak regulation requirement cannot be met. The flue gas at the temperature of 700-900 ℃ is not recovered and is not converted into continuous adjustable controllable high-temperature steam heat energy to generate electricity. And the smoke at 700-900 ℃ contains a large amount of sticky ash, so that the common smoke heat exchanger is difficult to bear the rapid cooling and heating change and overcome the flammable and explosive characteristics of the smoke.
Disclosure of Invention
The utility model discloses to the technical problem who exists among the prior art, provide a steelmaking converter flue gas waste heat recovery system, utilize ceramic formula flue gas fused salt heat exchanger to accomplish the waste heat recovery storage process of high temperature flue gas, the high temperature fused salt produces superheated steam through exchanging heat with water, gets into the terminal generator electricity generation of steam turbine drive.
The utility model adopts the technical proposal that: the utility model provides a steelmaking converter flue gas waste heat recovery system, includes flue gas pipeline, cyclone, two-stage particle dust collector, ceramic formula flue gas fused salt heat exchanger, cold molten salt storage tank, hot molten salt storage tank and fused salt steam heat transfer device, last cyclone, two-stage particle dust collector and the ceramic formula flue gas fused salt heat exchanger of having set gradually of flue gas pipeline, the fused salt entry of ceramic formula flue gas fused salt heat exchanger and the exit linkage of cold molten salt storage tank, the fused salt export of ceramic formula flue gas fused salt heat exchanger respectively with the entry linkage of cold molten salt storage tank, hot molten salt storage tank, the export of hot molten salt storage tank pass through fused salt steam heat transfer device with the entry linkage of cold molten salt storage tank.
Preferably, the molten salt steam heat exchange device comprises a superheater, an evaporator and a preheater which are connected in sequence.
Preferably, the superheater, the steam turbine, the condenser, the deaerator, the water feed pump and the preheater are communicated in sequence, and the steam turbine is connected with the generator.
Preferably, the outlets of the cold molten salt storage tank and the hot molten salt storage tank are respectively provided with a molten salt pump.
Preferably, the material of the outer wall of the heat exchange tube of the ceramic type flue gas molten salt heat exchanger is ceramic.
Preferably, two ends of the cold flue are respectively communicated with the flue gas pipelines at two ends of the ceramic type flue gas molten salt heat exchanger, and a three-way valve is arranged at the joint of the front end of the cold flue and the flue gas pipelines.
Preferably, the dust removing equipment at the front end of the ceramic heat exchanger is a cyclone dust remover and a two-stage particle dust removing device.
Preferably, an anti-condensation heater is arranged in the cold molten salt storage tank.
The working principle is as follows: the system adopts a bypass to lead out flue gas from a vaporization flue cooler of the original system, or improves the existing flue gas cooling coarse dust removal equipment on line, the flue gas is subjected to cyclone and two-stage particle dust removal, enters a ceramic flue gas molten salt heat exchanger to exchange heat with molten salt, does not intersect with the original cooling system, and cannot influence the normal production of the steelmaking converter.
The system utilizes the ceramic smoke fused salt heat exchanger to exchange heat between the smoke at the temperature of 700 plus 900 ℃ and the fused salt, stores the heat of the high-temperature smoke in the high-temperature fused salt, and finishes the waste heat recovery and storage process of the high-temperature smoke. The high-temperature molten salt exchanges heat with water to generate superheated steam, and the superheated steam enters a steam turbine to drive a tail-end generator to generate electricity.
Due to the intermittent flue gas characteristic in the converter steelmaking cycle, relevant equipment is in a high-temperature state when flue gas is generated, the flue gas is rapidly cooled to a low-temperature state after interruption, the heat storage and exchange process is changed between high temperature and low temperature all the time, and huge temperature difference exists.
In order to solve the change state of the rapid cooling and rapid heating, the system improves the process flow of the heat storage and exchange of the molten salt. When high-temperature flue gas is not generated, the temperature of the heat exchanger is sharply reduced, and at the moment, the temperature of the heat exchanger needs to be kept not lower than the working temperature of molten salt. Otherwise, when the temperature of the heat exchanger is reduced to be lower than the working temperature of the molten salt, the normal heat exchange in the next period is influenced, even the molten salt is solidified in the heat exchanger, and the whole set of equipment cannot be recovered to operate. Can switch to fused salt circulation heat preservation state this moment, cold fused salt storage tank fused salt low-load returns cold fused salt storage tank after through the heat exchanger circulation promptly, when jar interior fused salt temperature reduces, starts jar interior anti-condensing heater and carries out the concurrent heating, maintains fused salt and heat exchanger all the time and switches to normal heat transfer state at any time. The technology ensures that the heat exchange between the molten salt and the flue gas in the steelmaking period forms a virtuous cycle, and ensures the stable long-term operation of the whole system.
Compared with the prior art, the utility model discloses the beneficial effect who has is: the utility model adopts the ceramic flue gas molten salt heat exchanger, the heat exchange tube is not adhered with ash, and the heat exchanger can bear rapid cooling and rapid heating change and overcome the characteristics of flammable and explosive flue gas; the utility model discloses a structural design can make the flue gas waste heat obtain fully retrieving to medium temperature middling pressure superheated steam of byproduct, the electricity generation utilization efficiency is high, has still saved flue gas cooling's energy consumption. The utility model is particularly suitable for the 700 ℃ -900 ℃ steel-making converter flue gas containing a large amount of sticky ash after the waste heat of the radiation type flue is recovered.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
In the figure, 1-converter, 2-flue gas pipeline, 3-flue cooler, 4-two-stage particle dust removal device, 5-ceramic flue gas molten salt heat exchanger, 6-cyclone dust removal device, 7-cold molten salt storage tank, 8-hot molten salt storage tank, 9-molten salt pump, 10-superheater, 11-evaporator, 12-preheater, 13-steam turbine, 14-condenser, 15-deaerator, 16-water supply pump, 17-generator, 18-three-way valve and 19-cold flue.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The embodiment of the utility model provides a steelmaking converter flue gas waste heat recovery system, as shown in figure 1, it includes flue gas pipeline 2, flue cooler 3, cyclone 6, two-stage particle dust collector 4, ceramic formula flue gas fused salt heat exchanger 5, cold fused salt storage tank 7, hot fused salt storage tank 8, fused salt steam heat transfer device, and converter 1 links to each other with flue gas pipeline 2, flue gas pipeline 2 is last to have set gradually flue cooler 3, cyclone 6, two-stage particle dust collector 4, ceramic formula flue gas fused salt heat exchanger 5, and 19 both ends of cold flue gas pipeline communicate respectively in the flue gas pipeline 2 at 5 both ends of ceramic formula flue gas fused salt heat exchanger, the 19 front ends of cold flue gas pipeline and the junction of flue gas pipeline 2 are provided with three-way valve 18. The material of the outer wall of the heat exchange tube of the ceramic type flue gas molten salt heat exchanger 5 is ceramic. The molten salt inlet of the ceramic flue gas molten salt heat exchanger 5 is connected with the outlet of the cold molten salt storage tank 7, the molten salt outlet of the ceramic flue gas molten salt heat exchanger 5 is respectively connected with the inlets of the cold molten salt storage tank 7 and the hot molten salt storage tank 8, and the outlet of the hot molten salt storage tank 8 is connected with the inlet of the cold molten salt storage tank 7 through a molten salt steam heat exchange device. And the outlets of the cold molten salt storage tank 7 and the hot molten salt storage tank 8 are respectively provided with a molten salt pump 9. And an anti-condensation heater is arranged in the cold molten salt storage tank 7. The molten salt steam heat exchange device comprises a superheater 10, an evaporator 11 and a preheater 12 which are connected in sequence. The superheater 10, the steam turbine 13, the condenser 14, the deaerator 15, the feed water pump 16 and the preheater 12 are sequentially communicated, and the steam turbine 13 is connected with the generator 17.
The converter 1 generates flue gas with the temperature of about 1500 ℃, the temperature of the flue gas is reduced to about 800 ℃ after passing through the flue cooler 3, the flue gas passes through the bypass and is dedusted by the cyclone dedusting device 6 and the two-stage particle dedusting device 4, the flue gas enters the flue gas pipeline 2 where the ceramic type flue gas molten salt heat exchanger 5 is located, and low-temperature molten salt and the flue gas exchange heat at the ceramic type flue gas molten salt heat exchanger 5. And after heat exchange, the temperature of the flue gas is reduced to low temperature, and the low-temperature flue gas enters a dust remover for subsequent dust removal and coal gas cooling recovery. The temperature rises to high temperature from low temperature after the fused salt heat transfer, and high temperature fused salt gets into hot molten salt storage tank 8 and stores, and high temperature fused salt is pumped into over heater 10, evaporimeter 11, pre-heater 12 and water supply system heat transfer through molten salt pump 9, and the fused salt temperature after the heat transfer falls to low temperature and returns to cold fused salt storage tank 7. The feed water is subjected to heat exchange with molten salt through a preheater 12, an evaporator 11 and a superheater 10 to be changed into high-temperature high-pressure superheated steam, and the superheated steam enters a steam turbine 13 to drive a tail end generator 17 to generate electricity.
When high-temperature flue gas is not generated, the state is switched to a molten salt circulation heat preservation state, namely, low-temperature molten salt in the cold molten salt storage tank 7 returns to the cold molten salt storage tank 7 after circulating through the ceramic flue gas molten salt heat exchanger 5, when the temperature of the molten salt in the tank is reduced, the in-tank anti-condensation heater is started to supplement heat, and the molten salt and the heat exchanger are always kept to be switched to a normal heat exchange state at any time. At the same time, the three-way valve 18 is switched and the flue gas enters the cold flue 19.
The present invention has been described in detail with reference to the embodiments, but the description is only exemplary of the present invention and should not be construed as limiting the scope of the present invention. The protection scope of the present invention is defined by the claims. Technical scheme, or technical personnel in the field are in the utility model technical scheme's inspiration the utility model discloses an essence and protection within range, design similar technical scheme and reach above-mentioned technological effect, perhaps to the impartial change that application scope was made and improve etc. all should still belong to within the protection scope is covered to the patent of the utility model.
Claims (8)
1. The utility model provides a steelmaking converter flue gas waste heat recovery system which characterized in that: including flue gas pipeline, cyclone, two-stage particle dust collector, ceramic formula flue gas fused salt heat exchanger, cold fused salt storage tank, hot fused salt storage tank and fused salt steam heat transfer device, cyclone, two-stage particle dust collector and ceramic formula flue gas fused salt heat exchanger have set gradually on the flue gas pipeline, the fused salt entry of ceramic formula flue gas fused salt heat exchanger and the exit linkage of cold fused salt storage tank, ceramic formula flue gas fused salt heat exchanger's fused salt export respectively with the entry linkage of cold fused salt storage tank, hot fused salt storage tank, the export of hot fused salt storage tank pass through fused salt steam heat transfer device with the entry linkage of cold fused salt storage tank.
2. The steelmaking converter flue gas waste heat recovery system of claim 1, wherein: the molten salt steam heat exchange device comprises a superheater, an evaporator and a preheater which are connected in sequence.
3. The steelmaking converter flue gas waste heat recovery system of claim 2, wherein: the superheater, the steam turbine, the gas condensing machine, the deaerator, the water feed pump and the preheater are sequentially communicated, and the steam turbine is connected with the generator.
4. The steelmaking converter flue gas waste heat recovery system of claim 1, wherein: and the outlets of the cold molten salt storage tank and the hot molten salt storage tank are respectively provided with a molten salt pump.
5. The steelmaking converter flue gas waste heat recovery system of claim 1, wherein: the outer wall of the heat exchange tube of the ceramic type flue gas molten salt heat exchanger is made of ceramic.
6. The steelmaking converter flue gas waste heat recovery system of claim 1, wherein: two ends of the cold flue are respectively communicated with flue gas pipelines at two ends of the ceramic type flue gas molten salt heat exchanger, and a three-way valve is arranged at the joint of the front end of the cold flue and the flue gas pipelines.
7. The steelmaking converter flue gas waste heat recovery system of claim 1, wherein: the dust removing equipment at the front end of the ceramic type flue gas heat exchanger is a cyclone dust removing device and a two-stage particle dust removing device.
8. The steelmaking converter flue gas waste heat recovery system of claim 1, wherein: and an anti-condensation heater is arranged in the cold molten salt storage tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021803526.0U CN212902702U (en) | 2020-08-26 | 2020-08-26 | Steelmaking converter flue gas waste heat recovery system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021803526.0U CN212902702U (en) | 2020-08-26 | 2020-08-26 | Steelmaking converter flue gas waste heat recovery system |
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| CN212902702U true CN212902702U (en) | 2021-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021803526.0U Expired - Fee Related CN212902702U (en) | 2020-08-26 | 2020-08-26 | Steelmaking converter flue gas waste heat recovery system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237349A (en) * | 2021-04-27 | 2021-08-10 | 北京中冶设备研究设计总院有限公司 | Converter steam waste heat utilization device |
| CN114921608A (en) * | 2022-06-15 | 2022-08-19 | 北京勤泽鸿翔冶金科技有限公司 | Converter flue gas waste heat recovery and purification process |
| CN115307473A (en) * | 2022-08-11 | 2022-11-08 | 西安西热锅炉环保工程有限公司 | Heat storage system and method utilizing smoke heat of coal-fired boiler |
-
2020
- 2020-08-26 CN CN202021803526.0U patent/CN212902702U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237349A (en) * | 2021-04-27 | 2021-08-10 | 北京中冶设备研究设计总院有限公司 | Converter steam waste heat utilization device |
| CN114921608A (en) * | 2022-06-15 | 2022-08-19 | 北京勤泽鸿翔冶金科技有限公司 | Converter flue gas waste heat recovery and purification process |
| CN115307473A (en) * | 2022-08-11 | 2022-11-08 | 西安西热锅炉环保工程有限公司 | Heat storage system and method utilizing smoke heat of coal-fired boiler |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210406 Termination date: 20210826 |
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| CF01 | Termination of patent right due to non-payment of annual fee |