CN113237349A - Converter steam waste heat utilization device - Google Patents
Converter steam waste heat utilization device Download PDFInfo
- Publication number
- CN113237349A CN113237349A CN202110458602.1A CN202110458602A CN113237349A CN 113237349 A CN113237349 A CN 113237349A CN 202110458602 A CN202110458602 A CN 202110458602A CN 113237349 A CN113237349 A CN 113237349A
- Authority
- CN
- China
- Prior art keywords
- molten salt
- steam
- converter
- heat
- temperature
- Prior art date
- 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.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G1/00—Steam superheating characterised by heating method
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/006—Systems for reclaiming waste heat using a boiler
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/007—Systems for reclaiming waste heat including regenerators
-
- 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
Abstract
The invention provides a converter steam waste heat utilization device, which comprises a converter device, a molten salt heat storage device, a steam storage device and a steam waste heat consumption device, wherein the converter device comprises a converter body and a steam waste heat storage device; the converter device comprises a converter and a converter cooling flue; the molten salt heat storage device comprises a molten salt heat exchanger connected with the tail part of the cooling flue of the converter, a high-temperature molten salt tank, a low-temperature molten salt tank and a steam superheater, wherein the high-temperature molten salt tank and the low-temperature molten salt tank are respectively connected with the molten salt heat exchanger; the steam storage device comprises a converter steam drum connected with the converter cooling flue and a steam heat accumulator connected with the converter steam drum; a saturated steam outlet of the steam heat accumulator is connected with a steam superheater; the steam waste heat consumption device is connected with a superheated steam outlet of the steam superheater; and a condensed water outlet of the waste heat utilization device is connected with a cooling flue of the converter through a pipeline. The invention can solve the problems of serious cavitation, much condensed water and hydrophobic loss and the like of a steam waste heat utilization device in the prior art due to discontinuous and fluctuating steam of the converter and high steam humidity.
Description
Technical Field
The invention relates to the technical field of energy conservation and emission reduction of converter steel plants, in particular to a converter steam waste heat utilization device.
Background
As a large energy consumption household in China, the energy consumption of the iron and steel industry accounts for about 15% of the total national energy consumption, wherein the waste heat resource accounts for about 37%. At present, the utilization rate of high-temperature and medium-temperature waste heat resources in the domestic steel industry reaches up to 44 percent and 30 percent, and the utilization rate of low-temperature waste heat resources is only 0.6 percent. Therefore, the development of the low-temperature waste heat resource recycling technology in the steel industry is greatly promoted, and the method has important significance. In the converter steelmaking process, oxygen sprayed by an oxygen lance reacts with elements such as carbon in molten iron to generate a large amount of mixed gas mainly containing carbon monoxide, the high-temperature flue gas enters a gas purification system after being cooled by a cooling flue, cooling water in the cooling flue is heated and vaporized into low-pressure saturated steam, statistics shows that the steam yield of steel per ton of the converter is 80-120kg, the steel yield of the converter in China is 73798 ten thousand tons according to the development trend of electric furnace steelmaking in China in 2017, and the steel making of the converter is still the main steelmaking method in China in a long time in the future, the temperature of the saturated steam generated by the vaporization flue of the converter is generally 250 ℃ with 170 degrees centigrade, so that the recovery of the waste heat of the steam of the converter has great energy-saving potential and economic value. However, because converter steam is low-pressure saturated steam, the converter steam has high humidity, is easy to condense and is discontinuous in steam production, and the existing converter steam waste heat utilization system has the problems of low power generation efficiency, serious unit cavitation and the like.
Therefore, an effective technical approach is explored, saturated steam generated by the converter is heated into superheated steam, the power generation efficiency of the steam turbine unit is improved, and the method becomes a major subject in the field of environmental protection and energy conservation of metallurgical processes.
The existing converter steam waste heat utilization system is provided with a steam heat accumulator between a converter steam drum and a steam turbine set, and although the steam heat accumulator solves the problems of discontinuity and fluctuation of converter steam, the steam output by the steam heat accumulator is saturated steam with higher humidity, and the problems of low generating efficiency of the steam turbine set, serious steam corrosion of the steam turbine set, more condensed water and drainage loss and the like cannot be solved.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a device for utilizing residual heat of converter steam, so as to solve the problems of serious cavitation, and much condensed water and hydrophobic loss of the conventional device for utilizing residual heat of converter steam caused by discontinuity and fluctuation of converter steam and high steam humidity.
The invention provides a converter steam waste heat utilization device, which comprises a converter device, a molten salt heat storage device, a steam storage device and a steam waste heat consumption device, wherein the converter device comprises a converter body and a steam waste heat storage device; the converter device comprises a converter and a converter cooling flue connected with the converter; the molten salt heat storage device comprises a molten salt heat exchanger connected with the tail part of the converter cooling flue, a high-temperature molten salt tank and a low-temperature molten salt tank which are respectively connected with the molten salt heat exchanger, and a steam superheater connected between the high-temperature molten salt tank and the low-temperature molten salt tank; the steam storage device comprises a converter steam drum connected with the converter cooling flue and a steam heat accumulator connected with the converter steam drum; a saturated steam outlet of the steam heat accumulator is connected with a saturated steam inlet of the steam superheater; the steam waste heat consumption device is connected with a superheated steam outlet of the steam superheater; and a condensed water outlet of the steam waste heat consumption device is connected with the cooling flue of the converter through a pipeline.
In addition, the preferable scheme is that the molten salt heat exchanger is a built-in molten salt heat exchanger; the whole built-in molten salt heat exchanger is inserted in the tail of the cooling flue of the converter.
In addition, preferably, a gas purification system is connected to the lower end of the tail of the cooling flue of the converter.
In addition, it is preferable that the molten salt heat exchanger includes a heat exchange pipe; the heat exchange tube comprises at least two stainless steel tubes, and the adjacent stainless steel tubes are connected end to form a serpentine tube structure.
In addition, the preferable scheme is that a nano ceramic layer is arranged on the outer side wall of the heat exchange tube.
In addition, the preferable scheme is that the high-temperature molten salt tank, the steam superheater and the low-temperature molten salt tank are arranged in a row from top to bottom; a high-temperature molten salt outlet is formed in the bottom end of the high-temperature molten salt tank and connected with a molten salt inlet of the steam superheater; a low-temperature molten salt inlet is formed in the top end of the low-temperature molten salt tank, and the low-temperature molten salt outlet is connected with a molten salt outlet of the steam superheater; the low-temperature molten salt tank is connected with a molten salt inlet of the molten salt heat exchanger through a low-temperature molten salt pipeline, and a molten salt circulating pump is arranged on the low-temperature molten salt pipeline; the high-temperature molten salt tank is connected with a molten salt outlet of the molten salt heat exchanger through a high-temperature molten salt pipeline.
In addition, preferably, a first electric regulating valve is arranged at the connection position of a high-temperature molten salt outlet of the high-temperature molten salt tank and a molten salt inlet of the steam superheater; and/or a second electric regulating valve is arranged at the joint of the low-temperature molten salt inlet of the low-temperature molten salt tank and the molten salt outlet of the steam superheater.
In addition, the molten salt circulating pump is preferably an axial flow type circulating pump; and/or the steam superheater is a plate-shell type heat exchanger.
In addition, the capacity of the high-temperature molten salt tank and the capacity of the low-temperature molten salt tank are respectively 1.2 times of the storage capacity of the operating molten salt; and/or the outer side walls of the high-temperature molten salt tank and the low-temperature molten salt tank are provided with observation ports and instrument monitoring holes; and/or, the temperature of the operating molten salt is not higher than 450 ℃; and/or a first heat-preservation outer guard plate and a second heat-preservation outer guard plate are respectively arranged on the outer wall of the high-temperature molten salt tank and the outer side wall of the low-temperature molten salt tank; the temperature of the first heat-preservation outer protective plate and the temperature of the second heat-preservation outer protective plate are not higher than 50 ℃; and/or the flue gas temperature of the flue gas inlet of the molten salt heat exchanger is 800-1000 ℃.
In addition, the steam waste heat consumption device preferably comprises a steam turbine connected with a superheated steam outlet of the steam superheater, a condenser connected with the steam turbine, and a cooling tower connected with the condenser; and a condensed water outlet of the cooling tower is connected with the cooling flue of the converter through a pipeline.
According to the technical scheme, the converter steam waste heat utilization device provided by the invention forms thermodynamic cycle through the converter device, the molten salt heat storage device, the steam storage device and the steam waste heat consumption device; by utilizing the heat absorption characteristic and the heat storage characteristic of the fused salt, the violent change heat of the high-temperature flue gas is converted into continuous and stable output heat for heating low-pressure saturated steam, and the high-efficiency utilization of the flue gas waste heat is realized. The converter saturated steam superheating device exchanges heat with converter high-temperature flue gas with volatility through molten salt, the molten salt after heat absorption flows into the steam superheater through the high-temperature molten salt tank, the high-temperature molten salt exchanges heat with low-pressure saturated steam in the steam superheater, the high-temperature molten salt can continuously stabilize saturated steam (180 ℃) produced by the steam heat accumulator to be superheated to 300 ℃, and the superheated steam enters the steam waste heat consumption device for use, so that the loss of steam-water separation before steam transportation and use can be greatly reduced, the loss is about 10-15%, the workload of the steam waste heat consumption device can be increased by about 25%, and meanwhile, the steam corrosion of the steam waste heat consumption device is also reduced; because the molten salt has no physical property of phase change in the temperature increasing process, the molten salt flows in the pipe without pressure and does not belong to a pressure pipeline, and the system safety is high; the invention has the advantages of simple structure, small occupied area, full utilization of the waste heat of the high-temperature flue gas of the converter, heating of low-pressure saturated steam into superheated steam, contribution to improving the working efficiency of a steam waste heat consumption device, reduction of device cavitation, solving of the problems of much condensed water, drainage loss and the like, improvement of the utilization rate of waste heat steam, promotion of energy-saving development of metallurgical industry and the like.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Further, the present invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and results of the present invention will become more apparent and more readily appreciated as the same becomes better understood by reference to the following description taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 is a schematic structural diagram of a device for utilizing waste heat of converter steam according to an embodiment of the invention.
In the attached drawing, 11-converter, 12-converter cooling flue, 21-molten salt heat exchanger, 22-high temperature molten salt tank, 23-low temperature molten salt tank, 24-steam superheater, 25-low temperature molten salt pipeline, 26-molten salt circulating pump, 31-converter steam drum, 32-steam heat accumulator, 4-coal gas purification system, 51-steam turbine, 52-condenser and 53-cooling tower.
The same reference numbers in all figures indicate similar or corresponding features or functions.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details.
Aiming at the problems that the steam of the prior converter is discontinuous and fluctuated, and the steam humidity is high, so that the steam waste heat utilization device has serious cavitation, more condensed water and drainage loss and the like, the converter steam waste heat utilization device is provided.
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In order to explain the device for utilizing the residual heat of converter steam provided by the present invention, fig. 1 shows the structure of the device for utilizing the residual heat of converter steam according to the embodiment of the present invention.
As shown in fig. 1, the device for utilizing the steam waste heat of the converter provided by the invention comprises a converter device, a molten salt heat storage device, a steam storage device and a steam waste heat consumption device; the converter device comprises a converter 11 and a converter cooling flue 12 connected with the converter 11; the molten salt heat storage device comprises a molten salt heat exchanger 21 connected with the tail part of the converter cooling flue 12, a high-temperature molten salt tank 22 and a low-temperature molten salt tank 23 which are respectively connected with the molten salt heat exchanger 21, and a steam superheater 24 connected between the high-temperature molten salt tank 22 and the low-temperature molten salt tank 23; the steam storage device comprises a converter steam drum 31 connected with the converter cooling flue 12 and a steam heat accumulator 32 connected with the converter steam drum 31; a saturated steam outlet of the steam heat accumulator 32 is connected with a saturated steam inlet of the steam superheater 24; the steam waste heat consumption device is connected with a superheated steam outlet of the steam superheater 24; the condensed water outlet of the waste heat utilization device is connected with the cooling flue 12 of the converter through a pipeline.
A large amount of high-temperature flue gas generated by the converter 11 in a smelting period enters the converter cooling flue 12, cooling water and the high-temperature flue gas exchange heat in the converter cooling flue 12 by utilizing a condensed water outlet of a steam waste heat consumption device connected with the converter cooling flue 12, the cooling water absorbs heat and is evaporated and then enters the converter steam drum 31, low-pressure saturated steam flows into the steam heat accumulator 32 from the converter steam drum 31 after steam-water separation for storage, the high-temperature flue gas releases heat from the converter cooling flue 12 and then flows into the molten salt heat exchanger 21, low-temperature molten salt from the low-temperature molten salt tank 23 exchanges heat with the high-temperature flue gas through the molten salt heat exchanger 21, and after the high-temperature flue gas releases heat, the high-temperature flue gas is treated by a gas purification system; the low-temperature molten salt absorbs heat and then enters the high-temperature molten salt tank 22 to be stored, when the steam waste heat consumption device needs superheated steam, the molten salt in the high-temperature molten salt tank 22 enters the steam superheater 24 to exchange heat with saturated steam, the molten salt flows into the low-temperature molten salt tank 23 after releasing heat, the molten salt stored in the low-temperature molten salt tank enters the molten salt heat exchanger 21 to absorb heat, a complete molten salt heat absorption-heat storage-heat release circulation process is formed, and low-pressure saturated steam absorbs heat in the steam superheater 24 and becomes superheated steam for the steam waste heat consumption device to use.
A thermodynamic cycle is formed by the converter device, the molten salt heat storage device, the steam storage device and the steam waste heat consumption device; by utilizing the heat absorption characteristic and the heat storage characteristic of the fused salt, the violent change heat of the high-temperature flue gas is converted into continuous and stable output heat for heating low-pressure saturated steam, and the high-efficiency utilization of the flue gas waste heat is realized. The converter saturated steam superheating device exchanges heat with converter high-temperature flue gas with volatility through molten salt, the molten salt after heat absorption flows into the steam superheater through the high-temperature molten salt tank, the high-temperature molten salt exchanges heat with low-pressure saturated steam in the steam superheater, the high-temperature molten salt can continuously stabilize saturated steam (180 ℃) produced by the steam heat accumulator to be superheated to 300 ℃, and the superheated steam enters the steam waste heat consumption device for use, so that the loss of steam-water separation before steam transportation and use can be greatly reduced, the loss is about 10-15%, the workload of the steam waste heat consumption device can be increased by about 25%, and meanwhile, the steam corrosion of the steam waste heat consumption device is also reduced; because the molten salt has no physical property of phase change in the temperature increasing process, the molten salt flows in the pipe without pressure and does not belong to a pressure pipeline, and the system safety is high; the invention has the advantages of simple structure, small occupied area, full utilization of the waste heat of the high-temperature flue gas of the converter, heating of low-pressure saturated steam into superheated steam, contribution to improving the working efficiency of a steam waste heat consumption device, reduction of device cavitation, solving of the problems of much condensed water, drainage loss and the like, improvement of the utilization rate of waste heat steam, promotion of energy-saving development of metallurgical industry and the like.
As a preferable scheme of the present invention, the molten salt heat exchanger 21 is a built-in molten salt heat exchanger; the whole built-in molten salt heat exchanger is inserted in the tail part of the cooling flue 12 of the converter. The molten salt heat exchanger 21 adopts a single-layer or double-layer built-in design, and the molten salt heat exchanger 21 is integrally inserted into the tail part of the cooling flue 12 of the converter, so that the occupied area is small, and the heat exchange effect is good.
In a preferred embodiment of the present invention, a gas purification system 4 is connected to the lower end of the tail of the cooling flue 12 of the converter. The device is used for treating the flue gas after waste heat utilization, and reduces pollution.
As a preferred aspect of the present invention, the molten salt heat exchanger 21 includes a heat exchange pipe; the heat exchange tube comprises at least two stainless steel tubes, and the adjacent stainless steel tubes are connected end to form a serpentine tube structure. The fused salt heat exchanger 21 adopts a large-space tube bundle structure, and the heat exchange tubes are made of seamless special high-temperature-resistant wear-resistant stainless steel tubes and made into coiled tubes, so that the convective heat transfer coefficient of the wall surface is improved.
As a preferable scheme of the present invention, a nano ceramic layer is disposed on the outer side wall of the heat exchange tube. The method has the advantages that dust deposition in the converter flue gas is reduced, the operation of the original converter gas purification system is not influenced in order to ensure that the temperature of the converter flue gas is within a reasonable range, the fused salt heat exchanger 21 adopts a single-layer or double-layer design, the thickness of the heat exchanger is small, the transformation is convenient, the influence on the original system is small, the temperature drop of the flue gas is not more than 150 ℃ under the working condition of the maximum flue gas temperature heat exchange quantity, and the subsequent dust removal and recovery processes of the converter gas are. The fused salt pipeline and the fused salt heat exchanger adopt a thickening heat preservation design, so that heat loss is reduced as much as possible.
As a preferred embodiment of the present invention, the high-temperature molten salt tank 22, the steam superheater 24, and the low-temperature molten salt tank 23 are arranged in a row from top to bottom; a high-temperature molten salt outlet is arranged at the bottom end of the high-temperature molten salt tank 22 and is connected with a molten salt inlet of the steam superheater 24; a low-temperature molten salt inlet is formed in the top end of the low-temperature molten salt tank 23, and the low-temperature molten salt outlet is connected with a molten salt outlet of the steam superheater 24; the low-temperature molten salt tank 23 is connected with a molten salt inlet of the molten salt heat exchanger 21 through a low-temperature molten salt pipeline 25, and a molten salt circulating pump 26 is arranged on the low-temperature molten salt pipeline 25; the high-temperature molten salt tank 22 is connected with a molten salt outlet of the molten salt heat exchanger 21 through a high-temperature molten salt pipeline. Molten salt flows into the steam superheater 24 from the high-temperature molten salt tank 22 through the action of gravity, exchanges heat with low-pressure saturated steam in the steam superheater 24, flows into the low-temperature molten salt tank 23 from the steam superheater 24 through the action of gravity again after the molten salt releases heat, and the molten salt stored in the low-temperature molten salt tank 23 is pressurized by the molten salt circulating pump 26 and is pumped into the molten salt heat exchanger 21 to absorb heat.
As a preferable scheme of the present invention, a first electric control valve is arranged at the connection of the high-temperature molten salt outlet of the high-temperature molten salt tank 22 and the molten salt inlet of the steam superheater 24; and/or a second electric regulating valve is arranged at the joint of the low-temperature molten salt inlet of the low-temperature molten salt tank 23 and the molten salt outlet of the steam superheater 24. The molten salt flow is adjusted through the valve opening.
As a preferred embodiment of the present invention, the molten salt circulation pump 26 is an axial flow type circulation pump; and/or the steam superheater 24 is a plate-and-shell heat exchanger. The heat exchanger combines the advantages of a plate heat exchanger and a shell-and-tube heat exchanger, steam flows in the tube, molten salt medium flows between the plate shells, the flowing resistance of each medium is small, and the heat exchange efficiency is high.
As a preferable scheme of the present invention, the capacities of the high-temperature molten salt tank 22 and the low-temperature molten salt tank 23 are respectively 1.2 times of the storage amount of the operating molten salt; and/or, the outer side walls of the high-temperature molten salt tank 22 and the low-temperature molten salt tank 23 are provided with observation ports and instrument monitoring holes; and/or, the temperature of the operating molten salt is not higher than 450 ℃; and/or a first heat-preservation outer guard plate and a second heat-preservation outer guard plate are respectively arranged on the outer wall of the high-temperature molten salt tank 22 and the outer side wall of the low-temperature molten salt tank 23; the temperature of the first heat-preservation outer protective plate and the temperature of the second heat-preservation outer protective plate are not higher than 50 ℃; and/or the flue gas temperature at the flue gas inlet of the molten salt heat exchanger 21 is 800-1000 ℃. The tank body is provided with a necessary fused salt inlet and outlet, an observation port and an instrument monitoring hole; according to the parameters of the converter system and the heat storage capacity of the molten salt system.
As a preferred embodiment of the present invention, the steam waste heat consuming apparatus includes a steam turbine 51 connected to the superheated steam outlet of the steam superheater 24, a condenser 52 connected to the steam turbine 51, and a cooling tower 53 connected to the condenser 52; the condensed water outlet of the cooling tower 53 is connected to the converter cooling flue 12 through a pipe. The low-pressure saturated steam absorbs heat in the steam superheater 24 and turns into superheated steam, the superheated steam enters a steam turbine unit, the superheated steam works in a steam turbine 51 and is cooled in a condenser 52 by circulating water from a cooling tower 53 to form condensed water, and the condensed water is pressurized by a converter water feeding pump and is pumped into a converter cooling flue system to exchange heat with converter flue gas to generate converter steam, so that complete thermodynamic cycle is formed.
According to the converter steam waste heat utilization device, a converter device, a molten salt heat storage device, a steam storage device and a steam waste heat consumption device form thermodynamic cycle; by utilizing the heat absorption characteristic and the heat storage characteristic of the fused salt, the violent change heat of the high-temperature flue gas is converted into continuous and stable output heat for heating low-pressure saturated steam, and the high-efficiency utilization of the flue gas waste heat is realized. The converter saturated steam superheating device exchanges heat with converter high-temperature flue gas with volatility through molten salt, the molten salt after heat absorption flows into the steam superheater through the high-temperature molten salt tank, the high-temperature molten salt exchanges heat with low-pressure saturated steam in the steam superheater, the high-temperature molten salt can continuously stabilize saturated steam (180 ℃) produced by the steam heat accumulator to be superheated to 300 ℃, and the superheated steam enters the steam waste heat consumption device for use, so that the loss of steam-water separation before steam transportation and use can be greatly reduced, the loss is about 10-15%, the workload of the steam waste heat consumption device can be increased by about 25%, and meanwhile, the steam corrosion of the steam waste heat consumption device is also reduced; because the molten salt has no physical property of phase change in the temperature increasing process, the molten salt flows in the pipe without pressure and does not belong to a pressure pipeline, and the system safety is high; the invention has the advantages of simple structure, small occupied area, full utilization of the waste heat of the high-temperature flue gas of the converter, heating of low-pressure saturated steam into superheated steam, contribution to improving the working efficiency of a steam waste heat consumption device, reduction of device cavitation, solving of the problems of much condensed water, drainage loss and the like, improvement of the utilization rate of waste heat steam, promotion of energy-saving development of metallurgical industry and the like.
The converter steam waste heat utilization device proposed according to the present invention is described above by way of example with reference to the accompanying drawings. However, it should be understood by those skilled in the art that various modifications can be made to the converter steam waste heat utilization device provided by the invention without departing from the scope of the invention. Therefore, the scope of the present invention should be determined by the contents of the appended claims.
Claims (10)
1. A converter steam waste heat utilization device is characterized by comprising a converter device, a molten salt heat storage device, a steam storage device and a steam waste heat consumption device; wherein the content of the first and second substances,
the converter device comprises a converter and a converter cooling flue connected with the converter;
the molten salt heat storage device comprises a molten salt heat exchanger connected with the tail part of the converter cooling flue, a high-temperature molten salt tank and a low-temperature molten salt tank which are respectively connected with the molten salt heat exchanger, and a steam superheater connected between the high-temperature molten salt tank and the low-temperature molten salt tank;
the steam storage device comprises a converter steam drum connected with the converter cooling flue and a steam heat accumulator connected with the converter steam drum; a saturated steam outlet of the steam heat accumulator is connected with a saturated steam inlet of the steam superheater;
the steam waste heat consumption device is connected with a superheated steam outlet of the steam superheater; and a condensed water outlet of the waste heat utilization device is connected with the cooling flue of the converter through a pipeline.
2. The device for utilizing the residual heat of steam in the converter according to claim 1,
the molten salt heat exchanger is a built-in molten salt heat exchanger;
the whole built-in molten salt heat exchanger is inserted in the tail of the cooling flue of the converter.
3. The device for utilizing the residual heat of steam in the converter according to claim 2,
and the lower end of the tail part of the cooling flue of the converter is connected with a coal gas purification system.
4. The device for utilizing the residual heat of steam in the converter according to claim 2,
the molten salt heat exchanger comprises a heat exchange tube;
the heat exchange tube comprises at least two stainless steel tubes, and the adjacent stainless steel tubes are connected end to form a serpentine tube structure.
5. The device for utilizing the residual heat of steam in the converter according to claim 4,
and a nano ceramic layer is arranged on the outer side wall of the heat exchange tube.
6. The device for utilizing the residual heat of steam in the converter according to claim 1,
the high-temperature molten salt tank, the steam superheater and the low-temperature molten salt tank are arranged in a row from top to bottom;
a high-temperature molten salt outlet is formed in the bottom end of the high-temperature molten salt tank and connected with a molten salt inlet of the steam superheater;
a low-temperature molten salt inlet is formed in the top end of the low-temperature molten salt tank, and the low-temperature molten salt outlet is connected with a molten salt outlet of the steam superheater;
the low-temperature molten salt tank is connected with a molten salt inlet of the molten salt heat exchanger through a low-temperature molten salt pipeline, and a molten salt circulating pump is arranged on the low-temperature molten salt pipeline;
the high-temperature molten salt tank is connected with a molten salt outlet of the molten salt heat exchanger through a high-temperature molten salt pipeline.
7. The device for utilizing the residual heat of steam in the converter according to claim 6,
a first electric regulating valve is arranged at the joint of the high-temperature molten salt outlet of the high-temperature molten salt tank and the molten salt inlet of the steam superheater; and/or the presence of a gas in the gas,
and a second electric regulating valve is arranged at the joint of the low-temperature molten salt inlet of the low-temperature molten salt tank and the molten salt outlet of the steam superheater.
8. The device for utilizing the residual heat of steam in the converter according to claim 6,
the molten salt circulating pump is an axial-flow circulating pump; and/or the presence of a gas in the gas,
the steam superheater is a plate-shell type heat exchanger.
9. The device for utilizing the residual heat of steam in the converter according to claim 1,
the capacities of the high-temperature molten salt tank and the low-temperature molten salt tank are respectively 1.2 times of the storage amount of the operating molten salt; and/or the presence of a gas in the gas,
the outer side walls of the high-temperature molten salt tank and the low-temperature molten salt tank are respectively provided with an observation port and an instrument monitoring hole; and/or the presence of a gas in the gas,
the temperature of the operating molten salt is not higher than 450 ℃; and/or the presence of a gas in the gas,
a first heat-preservation outer protective plate and a second heat-preservation outer protective plate are respectively arranged on the outer wall of the high-temperature molten salt tank and the outer side wall of the low-temperature molten salt tank; the temperature of the first heat-preservation outer protective plate and the temperature of the second heat-preservation outer protective plate are not higher than 50 ℃; and/or the presence of a gas in the gas,
the flue gas temperature of the flue gas inlet of the molten salt heat exchanger is 800-1000 ℃.
10. The device for utilizing the residual heat of steam in the converter according to claim 1,
the steam waste heat consumption device comprises a steam turbine connected with a superheated steam outlet of the steam superheater, a condenser connected with the steam turbine and a cooling tower connected with the condenser;
and a condensed water outlet of the cooling tower is connected with the cooling flue of the converter through a pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110458602.1A CN113237349A (en) | 2021-04-27 | 2021-04-27 | Converter steam waste heat utilization device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110458602.1A CN113237349A (en) | 2021-04-27 | 2021-04-27 | Converter steam waste heat utilization device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113237349A true CN113237349A (en) | 2021-08-10 |
Family
ID=77129319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110458602.1A Pending CN113237349A (en) | 2021-04-27 | 2021-04-27 | Converter steam waste heat utilization device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113237349A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114704815A (en) * | 2022-04-08 | 2022-07-05 | 西安热工研究院有限公司 | Vapor heat storage system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104911296A (en) * | 2015-06-17 | 2015-09-16 | 中冶南方工程技术有限公司 | Converter coal gas treatment method and system |
| CN207095315U (en) * | 2017-07-19 | 2018-03-13 | 中冶南方工程技术有限公司 | Electric furnace flue gas processing 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 |
| CN111238248A (en) * | 2020-03-20 | 2020-06-05 | 北京中冶设备研究设计总院有限公司 | Converter steam waste heat utilization system additionally provided with self-superheater |
| CN212902702U (en) * | 2020-08-26 | 2021-04-06 | 裕润丰(天津)科技有限公司 | Steelmaking converter flue gas waste heat recovery system |
-
2021
- 2021-04-27 CN CN202110458602.1A patent/CN113237349A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104911296A (en) * | 2015-06-17 | 2015-09-16 | 中冶南方工程技术有限公司 | Converter coal gas treatment method and system |
| CN207095315U (en) * | 2017-07-19 | 2018-03-13 | 中冶南方工程技术有限公司 | Electric furnace flue gas processing 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 |
| CN111238248A (en) * | 2020-03-20 | 2020-06-05 | 北京中冶设备研究设计总院有限公司 | Converter steam waste heat utilization system additionally provided with self-superheater |
| CN212902702U (en) * | 2020-08-26 | 2021-04-06 | 裕润丰(天津)科技有限公司 | Steelmaking converter flue gas waste heat recovery system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114704815A (en) * | 2022-04-08 | 2022-07-05 | 西安热工研究院有限公司 | Vapor heat storage system |
| CN114704815B (en) * | 2022-04-08 | 2023-11-07 | 西安热工研究院有限公司 | Steam heat storage system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102997267B (en) | Smoke reheating device of combining phase-change heat exchanger with net gas heater | |
| CN201028471Y (en) | Low-temperature waste-gas exhaust-heat boiler of sintering cooler | |
| CN101881436A (en) | Separate low pressure coal economizer of elliptical fin heat pipe | |
| CN105570956B (en) | A kind of residual heat from boiler fume circulating heat supply system | |
| CN102410549A (en) | Composite phase change heat exchange system for flue gas heat recovery of boiler | |
| CN113237349A (en) | Converter steam waste heat utilization device | |
| CN104089268B (en) | A kind of power type heat pipe waste heat boiler device | |
| CN205402641U (en) | Become residual heat from flue gas boiler of space unsteady flow field | |
| CN108373925B (en) | Coke oven raw gas sensible heat recycling device | |
| CN104089267B (en) | A kind of power type heat pipe-type exhaust heat recovering method | |
| CN203517747U (en) | Anticorrosion wear-resistant composite phase-change heat exchanger | |
| CN105588095B (en) | The flue gas waste heat recovery boiler of emptying unsteady flow field | |
| CN206247310U (en) | Condensate circulating heater | |
| CN103363539A (en) | Comprehensive flue waste heat utilization device | |
| CN203375525U (en) | Comprehensive utilization device of flue waste heat | |
| CN203159420U (en) | System for reducing corrosion to tail heating surface of glass melter waste heat boiler | |
| CN206001435U (en) | A kind of boiler blow-off hydrothermal exchange intermediate water tank | |
| CN207006100U (en) | A kind of central cooler waste gas and sintering smoke from big gas duct waste heat comprehensive utilization system | |
| CN205387578U (en) | Exhaust -heat boiler behind blast furnace slag dry granulation | |
| CN104729307A (en) | Heat exchange set for flue gas waste heat recovery | |
| CN110243009A (en) | Absorption heat pump heat accumulation and thermal desorption system and its working method for thermal power plant unit | |
| CN209622754U (en) | Superhigh temperature ultrahigh pressure coal gas boiler horizontal flue convection current vapo(u)rization system | |
| CN203742688U (en) | Industrial waste heat power generation device | |
| CN216769435U (en) | Reheating steam heating system of high-parameter waste incineration exhaust-heat boiler | |
| CN218916014U (en) | Vertical spiral tube evaporator using low-melting-point liquid alloy as heat exchange working medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |