CN114909195A - Converter slag heat-taking power generation system and power generation method thereof - Google Patents

Converter slag heat-taking power generation system and power generation method thereof Download PDF

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Publication number
CN114909195A
CN114909195A CN202210400480.5A CN202210400480A CN114909195A CN 114909195 A CN114909195 A CN 114909195A CN 202210400480 A CN202210400480 A CN 202210400480A CN 114909195 A CN114909195 A CN 114909195A
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China
Prior art keywords
power generation
slag
generation system
converter
converter slag
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Granted
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CN202210400480.5A
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Chinese (zh)
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CN114909195B (en
Inventor
王艳丽
安卫春
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Hebei Xinda Iron and Steel Group Co Ltd
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Hebei Xinda Iron and Steel Group Co Ltd
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Priority to CN202210400480.5A priority Critical patent/CN114909195B/en
Publication of CN114909195A publication Critical patent/CN114909195A/en
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    • 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
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • C21B3/06—Treatment of liquid slag
    • C21B3/08—Cooling slag
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • 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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N11/00—Generators or motors not provided for elsewhere; Alleged perpetua mobilia obtained by electric or magnetic means
    • H02N11/002—Generators
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/05—Apparatus features
    • C21B2400/06—Conveyors on which slag is cooled
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C2200/00—Recycling of waste material
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

The invention discloses a converter slag heat-taking power generation system and a power generation method thereof, belonging to the field of machinery, and comprising a cast slag hopper, a waste heat recovery boiler and a cast slag hopper conveying system for circularly conveying the cast slag hopper between the position right below a converter and the waste heat recovery boiler, wherein a converter slag steam Rankine cycle power generation system and a converter slag thermal semiconductor temperature difference power generation system are sequentially arranged in the waste heat recovery boiler along the conveying direction of the cast slag hopper, and a cooling air sending port is formed on the side wall of the waste heat recovery boiler. The beneficial effects of the invention are: a converter slag heat-taking power generation system is arranged below the converter, a waste heat boiler system is established at a high-temperature section, and power is generated by adopting a steam Rankine cycle principle; the flue gas that the low temperature section was taken out is <350 ℃, adopts semiconductor thermoelectric generation principle electricity generation, has improved the recovery ability to the low temperature waste heat, has realized the thermal step recycle of converter slag, and then has improved the thermal utilization efficiency of converter slag.

Description

Converter slag heat-taking power generation system and power generation method thereof
Technical Field
The invention relates to the field of machinery, in particular to a converter slag heat-taking power generation system and a power generation method thereof.
Background
The conventional method for generating power by utilizing converter slag through heat transfer mainly comprises the steps of feeding converter smelting slag into a slag basin, piling the slag basin for several times, then discharging the slag out of a furnace slag basin vehicle, and pouring slag into a processing device to chop the slag into fragments. Blowing cold air for heat exchange to obtain hot air; the hot air enters the heat exchanger to heat water and turns into steam, the steam drags the steam turbine to generate electricity, and the steam which does work enters the cooling tower to be cooled. The mode has low efficiency of converting heat energy into electric energy, and can not effectively utilize low-temperature waste heat, and in addition, a large amount of heat is lost in the process of pouring converter slag into a slag basin and conveying the converter slag by a slag basin vehicle, so that great heat waste is caused.
Therefore, the problem to be solved by those skilled in the art is how to improve the utilization efficiency of the heat of the converter slag and reduce the waste of the heat.
Disclosure of Invention
In order to solve the problems of low utilization efficiency of converter slag heat, serious heat waste, incapability of effectively utilizing low-temperature waste heat and the like in the prior art of converter slag heat-taking power generation, the invention provides a converter slag heat-taking power generation system which comprises a cast slag hopper, a waste heat recovery boiler and a cast slag hopper conveying system for circularly conveying the cast slag hopper between the position right below a converter and the waste heat recovery boiler, wherein a converter slag steam Rankine cycle power generation system and a converter slag thermal semiconductor temperature difference power generation system are sequentially arranged in the waste heat recovery boiler along the conveying direction of the cast slag hopper, and a cold air conveying opening is formed in the side wall of the waste heat recovery boiler.
A converter slag heat-taking power generation system is arranged below the converter, a waste heat boiler system is established at a high-temperature section, and power is generated by adopting a steam Rankine cycle principle; the flue gas pumped out from the low-temperature section is less than 350 ℃, power is generated by adopting the semiconductor thermoelectric generation principle, the recovery capacity of low-temperature waste heat is improved, the gradient recycling of converter slag heat is realized, and the utilization efficiency of the converter slag heat is further improved.
Preferably, the converter slag steam Rankine cycle power generation system is located in the waste heat recovery boiler at a position right above the cast slag hopper and close to the inlet. The slag falls into the slag casting hopper and is cast into a slag block, and then the slag block enters the waste heat recovery boiler, and the heat is transferred to the furnace tube of the waste heat boiler by utilizing the high-temperature radiation heat transfer of the slag block, so that the furnace tube of the waste heat boiler directly generates high-temperature steam for power generation.
Preferably, the converter slag steam Rankine cycle power generation system comprises a waste heat boiler tube, a water inlet of the waste heat boiler tube is connected with a water outlet of the condenser, and a water outlet of the waste heat boiler tube is connected with the steam turbine power generation system. A steam pocket is also arranged between the waste heat boiler tube and the steam turbine power generation system. And the air outlet of the steam turbine power generation system is connected with the water inlet of the condenser, so that the water vapor circulation power generation is formed.
Preferably, the waste heat boiler tubes are coiled tube rows. The snakelike bank of tubes is by the level and the main part pipe of mutual parallel arrangement with be used for forming the snakelike connecting portion of main part pipe end to end series, snakelike bank of tubes place plane can be parallel with the horizontal plane, also can be perpendicular, prefers the entry of snakelike bank of tubes is located and is close to waste heat recovery boiler export one side, and the snakelike outlet of tubes is located and is close to waste heat recovery boiler entry one side.
Preferably, a cooling air inlet is formed in the side wall of the waste heat recovery boiler below the slag casting hopper. And after cold air of the air cooling port enters the waste heat recovery boiler, the cold air exchanges heat with slag blocks in the slag casting hopper to form hot air and flows to the converter slag thermal semiconductor temperature difference power generation system, and the hot air can also exchange heat with the pipe wall of the waste heat boiler pipe in the process of flowing to the converter slag thermal semiconductor temperature difference power generation system. The cold air ports can be horizontally arranged into one row or more than two rows.
Preferably, the converter slag thermal semiconductor temperature difference power generation system is located above one end, close to the outlet, of the waste heat recovery boiler, and a cooling air inlet is formed in the side wall of the waste heat recovery boiler at a position between the converter slag steam Rankine cycle power generation system and the converter slag thermal semiconductor temperature difference power generation system. Preferably, the air cooling and conveying nozzles can be horizontally arranged into two rows which are respectively positioned above and below the slag hopper, and can also be horizontally arranged into a plurality of rows.
Preferably, the converter slag thermal semiconductor temperature difference power generation system comprises a hot air collecting main pipe, a hot end heat exchanger, a cold end heat exchanger, a conducting strip, a P-type semiconductor power generation chip and an N-type semiconductor power generation chip, wherein an outlet of the hot air collecting main pipe is connected with an inlet of the hot end heat exchanger, and the hot end heat exchanger and the cold end heat exchanger are both in a tubular structure and are arranged in parallel along the length direction; the conducting strips are alternately arranged on the outer side walls of the hot end heat exchanger and the cold end heat exchanger at positions close to one side of each other along the length direction of the hot end heat exchanger, and the P-type semiconductor power generation chip and the N-type semiconductor power generation chip alternately connect the end parts of the conducting strips on the outer side walls of the hot end heat exchanger and the cold end heat exchanger in series to form a semiconductor temperature difference power generation structure. After the hot air is generated by the hot end heat exchanger, the hot air is dedusted by the bag dedusting device to form clean air which is exhausted by the induced draft fan.
Preferably, a hot end insulating heat transfer layer is arranged between the conducting strip and the outer side wall of the hot end heat exchanger; and a cold end insulating heat transfer layer is arranged between the conducting strip and the outer side wall of the cold end heat exchanger.
Preferably, the casting slag bucket conveying system comprises two horizontally arranged driving gears and a conveying chain arranged on the surfaces of the two driving gears, and the casting slag bucket is arranged on the conveying chain and can move along with the conveying chain. The conveying chain is driven by the driving gear to convey the cast slag bucket, and the large gear motor speed reducer controls the slag bucket on the chain to move seamlessly.
Preferably, the outlet of the waste heat recovery boiler is located below the converter slag thermal semiconductor temperature difference power generation system, the outlet of the waste heat recovery boiler is located underground, a single-roller crushing system is arranged at the outlet, the slag block is demoulded and separated from a slag hopper at the tail end of the conveying chain, a fine slag block is formed after being crushed by the single-roller crushing system, a material lifting conveying rubber belt is used for conveying the fine slag block to a hopper on the ground from the underground, an automobile or a train is conveyed to a tailing treatment plant for grinding, and after iron-containing materials are separated, the waste heat recovery boiler is used for building cement raw materials, so that green pollution-free treatment is realized.
Preferably, in order to facilitate the detachment of the slag bear from the ladle, a layer of mold release agent may be sprayed on the surface of the converter slag before it falls into the ladle. Specifically, a release agent spraying device is arranged below the lower layer conveying chain.
Preferably, the demolding agent spraying device comprises a demolding agent stirring pool, a demolding agent conveying pipeline and a spraying pipe, nozzles are uniformly distributed on the spraying pipe along the length direction, a mechanical swing speed reducer and a driving motor are installed at one end of the spraying pipe, the input end of the mechanical swing speed reducer is installed at the output end of the driving motor, and the spraying pipe can be controlled to rotate and swing on the horizontal plane by 45 degrees under the driving action of the driving motor, so that the uniformity of the demolding agent in the surface spraying of the casting slag hopper is improved.
Preferably, a section of metal hose is arranged at the connecting position of the release agent conveying pipeline and the spraying pipe, so that the spraying pipe can swing mechanically.
Preferably, a stirrer is arranged in the release agent stirring pool.
Preferably, a pump body for delivering the release agent to the spray pipe is installed in the release agent stirring pool at the inlet position of the release agent delivery pipeline.
Preferably, the release agent is formed by mixing white lime, coal slime and water according to a certain proportion.
Preferably, a water returning trench is arranged at the position below the lower layer conveying chain, and the redundant release agent flows back to the release agent stirring pool after passing through the water returning trench.
In many cases, the converter is rotatory to pour into the in-process of converter slag into the cast slag fill, and converter slag takes place to splash easily, causes calorific loss, damages cast slag fill and conveying chain, can harm operating personnel's personal safety even, and the preferred here sets up one between converter and cast slag fill and prevents the slag device that splashes for prevent the in-process calorific loss that converter slag pours into the cast slag fill, reduces the adverse effect that causes equipment and personnel.
Preferably, the steel slag splashing prevention device is of a trapezoidal funnel structure with a wide upper part and a narrow lower part. The converter slag falls into the slag casting hopper from the lower opening of the trapezoidal funnel structure through the upper opening of the trapezoidal funnel structure along the inner wall of the trapezoidal funnel structure, and splashing of the converter slag is effectively prevented.
Preferably, trapezoidal funnel structure is enclosed by the splashproof backplate, installs on its at least one side lateral wall to be used for preventing the hydraulic pressure top cylinder of converter slag adhesion on the splashproof backplate inner wall, hydraulic pressure top cylinder is installed on the splashproof backplate outer wall, just on the splashproof backplate outer wall with hydraulic pressure top cylinder corresponds the department of being located and is formed with the mounting hole.
Preferably, the hydraulic pressure top cylinder fixed end passes through top cylinder pedestal fixed mounting in splashproof backplate outer wall mounting hole border department, the hydraulic pressure top cylinder top is located inside the mounting hole. During operation, the hydraulic top cylinder top head is used for carrying out high-frequency impact in the mounting hole to form vibration, so that converter slag on the inner wall of the splash-proof guard plate falls off from the surface of the splash-proof guard plate, and the converter slag is prevented from being adhered to the inner wall of the splash-proof guard plate.
Preferably, the splash guard plate comprises a corrosion-resistant stainless steel plate, heat insulation cotton and a protection galvanized plate from inside to outside, wherein the thickness of the corrosion-resistant stainless steel plate is preferably 30 mm.
The invention also provides a power generation method of the converter slag heat-taking power generation system, which comprises the following steps:
step one, dumping the converter to enable the slag to fall into a slag casting hopper, and casting the slag into a blocky slag block;
step two, the casting slag hopper enters a waste heat recovery boiler under the conveying action of a casting slag hopper conveying system;
step three, when the slag blocks pass through a converter slag steam Rankine cycle power generation system in movement, heat is conducted to a waste heat boiler tube by utilizing radiation heat transfer, so that steam with higher temperature is directly generated for power generation;
and step four, heating the air of the waste heat recovery boiler by utilizing the slag blocks to form hot air, and conveying the hot air to a converter slag thermal semiconductor temperature difference power generation system for power generation. In the actual operation process, the system can be built under a plurality of converter furnaces and run in parallel, the problem that intermittent deslagging of the converters affects unstable operation of vapor pressure is solved, and stable operation of a power generation system is guaranteed.
Has the advantages that:
the technical scheme of the invention has the following beneficial effects:
(1) a converter slag heat-taking power generation system is arranged below the converter, a waste heat boiler system is established in a high-temperature section, and power is generated by adopting a steam Rankine cycle principle; the flue gas that the low temperature section was taken out is <350 ℃, adopts semiconductor thermoelectric generation principle electricity generation, has improved the recovery ability to the low temperature waste heat, has realized the thermal step recycle of converter slag, and then has improved the thermal utilization efficiency of converter slag.
(2) The existing converter slag conveying and transporting mode is cancelled, a slag-free basin processing system under the converter is adopted, the continuous processing of the converter slag is realized by a slag casting bucket conveying system, a plurality of small converter slag blocks are cast, the processes of slag chopping and crushing are realized, the energy consumption is reduced, the heat radiation area of the high-temperature converter slag on the water-cooled tube waste heat boiler tube is increased, and the high-temperature steam is directly generated for power generation.
(3) The slag falls into the slag casting hopper and is cast into a slag block, and then the slag block enters the waste heat recovery boiler, and the heat is transferred to the furnace tube of the waste heat boiler by utilizing the high-temperature radiation heat transfer of the slag block, so that the furnace tube of the waste heat boiler directly generates high-temperature steam for power generation.
(4) By means of semiconductor temperature difference power generation, low-temperature waste heat in the converter slag cascade waste heat is recovered, the maximum advantage of semiconductor temperature difference power generation of low-end waste heat in the converter slag low-temperature waste heat is fully exerted, and efficient utilization of low-grade energy is achieved.
(5) Through calculation, the system can save the consumption of 0.35Kg of standard coal and 4Kg of water when generating 1KW.h of electricity; the emission of 1.1Kg of Co2, SO2 and nitrogen oxides is reduced, the heat of the converter slag is converted into electric energy, the utilization efficiency of the energy is improved, and the environmental pollution is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of a preferred slag heat-extraction power generation system of the present invention;
FIG. 2 is a schematic diagram of a preferred converter slag thermal semiconductor temperature difference power generation system of the present invention;
FIG. 3 is a schematic diagram of a preferred mold release agent spraying apparatus of the present invention;
FIG. 4 is a schematic diagram of a preferred hydraulic ram of the present invention.
In the figure, 1, a casting slag hopper; 11. a converter; 2. a waste heat recovery boiler; 21. a cold air delivery port;
22. a single-roll crushing system; 23. lifting and conveying a rubber belt; 3. a slag hopper conveying system; 31. a drive gear; 32. a conveying chain; 4. a converter slag steam Rankine cycle power generation system;
41. a waste heat boiler tube; 42. a condenser; 43. a steam turbine power generation system; 44. a steam drum;
5. a converter slag thermal semiconductor temperature difference power generation system; 51. a hot air collection header pipe; 52. a hot end heat exchanger; 53. a cold end heat exchanger; 54. a conductive sheet; 55. a P-type semiconductor power generation chip;
56. an N-type semiconductor power generation chip; 57. a hot end insulating heat transfer layer; 58. a cold end insulating heat transfer layer; 6. a release agent spraying device; 61. a mold release agent stirring tank; 62. a release agent delivery conduit; 63. a spray pipe; 64. a nozzle; 65. a drive motor; 66. a mechanical swing reducer; 67. a metal hose; 68. a blender; 69. a pump body; 7. a steel slag splashing prevention device; 71. a splash guard plate; 711. a corrosion-resistant stainless steel plate; 712. heat preservation cotton; 713. protecting the galvanized sheet; 72. a hydraulic jacking cylinder; 73. a cylinder jacking seat body; 74. and (7) installing holes.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive efforts based on the embodiments of the present invention, are within the scope of protection of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the embodiment, a converter slag heat-taking power generation system is arranged below the converter, a waste heat boiler system is established in a high-temperature section, and power is generated by adopting a steam Rankine cycle principle; the flue gas that the low temperature section was taken out is <350 ℃, adopts semiconductor thermoelectric generation principle electricity generation, has improved the recovery ability to the low temperature waste heat, has realized the thermal step recycle of converter slag, and then has improved the thermal utilization efficiency of converter slag. The specific implementation mode is as follows:
as shown in fig. 1, the converter slag heat-taking power generation system comprises a cast slag bucket 1, a waste heat recovery boiler 2 and a cast slag bucket conveying system 3 for circularly conveying the cast slag bucket 1 between the position right below a converter 11 and the waste heat recovery boiler 2, a converter slag steam rankine cycle power generation system 4 and a converter slag thermal semiconductor temperature difference power generation system 5 are sequentially arranged in the waste heat recovery boiler 2 along the conveying direction of the cast slag bucket 1, and a cooling air inlet 21 is formed in the side wall of the waste heat recovery boiler 2.
A converter slag heat-taking power generation system is arranged below the converter 11, a waste heat boiler system is established at a high-temperature section, and power is generated by adopting a steam Rankine cycle principle; the flue gas that the low temperature section was taken out is <350 ℃, adopts semiconductor thermoelectric generation principle electricity generation, has improved the recovery ability to the low temperature waste heat, has realized the thermal step recycle of converter slag, and then has improved the thermal utilization efficiency of converter slag.
In a preferred embodiment, the converter slag steam rankine cycle power generation system 4 is located in the heat recovery boiler 2 at a position immediately above the slag ladle 1 and near the inlet. The slag falls into the slag casting hopper and is cast into a slag block, and then the slag block enters the waste heat recovery boiler, and the heat is transferred to the furnace tube of the waste heat boiler by utilizing the high-temperature radiation heat transfer of the slag block, so that the furnace tube of the waste heat boiler directly generates high-temperature steam for power generation.
In a preferred embodiment, the converter slag steam rankine cycle power generation system 4 comprises a waste heat boiler tube 41, wherein a water inlet of the waste heat boiler tube 41 is connected with a water outlet of a condenser 42, and a water outlet of the waste heat boiler tube is connected with a steam turbine power generation system 43. A steam pocket 44 is also arranged between the waste heat boiler tube 41 and the steam turbine power generation system 43. The air outlet of the steam turbine power generation system 43 is connected with the water inlet of the condenser 42, so that the steam cycle power generation is formed.
In a preferred embodiment, the heat recovery boiler tubes 41 are serpentine tube rows. The snakelike bank of tubes is by the level and the main part pipe of mutual parallel arrangement with be used for forming the snakelike connecting portion of main part pipe end to end series, snakelike bank of tubes place plane can be parallel with the horizontal plane, also can be perpendicular, prefers the entry of snakelike bank of tubes is located and is close to waste heat recovery boiler export one side, and the snakelike outlet of tubes is located and is close to waste heat recovery boiler entry one side.
In a preferred embodiment, a cool air sending port 21 is formed in the sidewall of the heat recovery boiler 2 at a position below the slag hopper. And after cold air of the air cooling port enters the waste heat recovery boiler, the cold air exchanges heat with slag blocks in the slag casting hopper to form hot air and flows to the converter slag thermal semiconductor temperature difference power generation system, and the hot air can also exchange heat with the pipe wall of the waste heat boiler pipe in the process of flowing to the converter slag thermal semiconductor temperature difference power generation system. The cold air ports can be horizontally arranged into one row or more than two rows.
In a preferred embodiment, the converter slag thermal semiconductor temperature difference power generation system 5 is located above one end of the heat recovery boiler 2 close to the outlet, and a cooling air inlet 21 is formed in a side wall of the heat recovery boiler 2 at a position between the converter slag steam rankine cycle power generation system 4 and the converter slag thermal semiconductor temperature difference power generation system 5. Preferably, the air cooling and air feeding openings can be horizontally arranged into two rows respectively above and below the slag-casting hopper, and can also be horizontally arranged into a plurality of rows.
As a preferred embodiment, as shown in fig. 2, the converter slag thermal semiconductor temperature difference power generation system 5 includes a hot air collecting main pipe 51, a hot-end heat exchanger 52, a cold-end heat exchanger 53, a conducting strip 54, a P-type semiconductor power generation chip 55, and an N-type semiconductor power generation chip 56, an outlet of the hot air collecting main pipe 51 is connected to an inlet of the hot-end heat exchanger 52, and the hot-end heat exchanger 52 and the cold-end heat exchanger 53 are both tubular structures and are arranged in parallel along the length direction; the conducting strips 54 are alternately arranged on the outer side walls of the hot end heat exchanger 52 and the cold end heat exchanger 53 at positions close to one another along the length direction of the hot end heat exchanger 52, and the P-type semiconductor power generation chip 55 and the N-type semiconductor power generation chip 56 alternately connect the ends of the conducting strips 54 on the outer side walls of the hot end heat exchanger 52 and the cold end heat exchanger 53 in series to form a semiconductor thermoelectric power generation structure. After the hot air is generated by the hot end heat exchanger, the hot air is dedusted by the bag dedusting device to form clean air which is exhausted by the induced draft fan.
In a preferred embodiment, a hot-end insulating heat transfer layer 57 is arranged between the conductive sheet 54 and the outer side wall of the hot-end heat exchanger 52; a cold end insulating heat transfer layer 58 is arranged between the conducting strip 54 and the outer side wall of the cold end heat exchanger 53.
In a preferred embodiment, the ladle conveyor system 3 comprises two horizontally arranged drive gears 31 and a conveyor chain 32 mounted on the surface of the two drive gears 31, and the ladle 1 is mounted on the conveyor chain 32 and can move along with the conveyor chain 32. The conveying chain is driven by the driving gear to convey the cast slag hopper, and the large gear motor reducer controls the slag hopper on the chain to move seamlessly.
As a preferred embodiment, the outlet of the waste heat recovery boiler 2 is located below the converter slag thermal semiconductor temperature difference power generation system 5, the outlet is located underground, the single-roller crushing system 22 is arranged at the outlet, the slag blocks at the tail end of the conveying chain 32 are demolded and separated from the slag casting hopper 1, the slag blocks are crushed by the single-roller crushing system to form fine slag blocks, the fine slag blocks are conveyed to a hopper on the ground from the underground by a material lifting conveying rubber belt 23, the fine slag blocks are conveyed to a tailing treatment plant by an automobile or a train to be ground, and after iron-containing materials are separated, the fine slag blocks are used as building cement raw materials to realize green pollution-free treatment.
In order to facilitate the detachment of the slag lumps from the slag hopper, a layer of mold release agent may be sprayed on the surface of the converter slag before it falls into the slag hopper 1. Specifically, a mold release agent spraying device 6 is installed below the lower layer conveying chain.
As a preferred embodiment, as shown in fig. 3, the mold release agent spraying device 6 comprises a mold release agent stirring tank 61, a mold release agent conveying pipeline 62 and a spraying pipe 63, wherein nozzles 64 are uniformly distributed on the spraying pipe 63 along the length direction, a mechanical swing reducer 66 and a driving motor 65 are mounted at one end of the spraying pipe 63, the input end of the mechanical swing reducer 66 is mounted at the output end of the driving motor 65, and the spraying pipe 63 can be controlled to rotate and swing at 45 ° on the horizontal plane under the driving action of the driving motor 65, so that the uniformity of the mold release agent spraying on the surface of the casting slag bucket is improved.
In a preferred embodiment, a section of flexible metal hose 67 is provided on the release agent delivery pipe 62 at the connection position with the spray pipe 63, so as to facilitate the mechanical swing of the spray pipe.
In a preferred embodiment, a stirrer 68 is provided in the mold release agent stirring tank 61.
In a preferred embodiment, a pump 69 for delivering the release agent to the spray pipe is installed in the release agent stirring tank 61 at the inlet of the release agent delivery pipe.
In a preferred embodiment, the release agent is prepared by mixing white lime, coal slime and water according to a certain proportion.
In a preferred embodiment, a water return trench (not shown) is arranged at a position below the lower layer conveying chain, and the excess release agent flows back to the release agent stirring pool after passing through the water return trench.
In many cases, the converter is rotated to pour the converter slag into the cast slag bucket, the converter slag is easy to splash, heat loss is caused, the cast slag bucket and a conveying chain are damaged, and even the personal safety of operators is damaged, and a steel slag splashing prevention device 7 is preferably arranged between the converter and the cast slag bucket and used for preventing the heat loss in the process of pouring the converter slag into the cast slag bucket and reducing adverse effects on equipment and personnel.
In a preferred embodiment, the steel slag splashing prevention device 7 is a trapezoidal funnel structure with a wide upper part and a narrow lower part. The converter slag falls into the slag casting hopper from the lower opening of the trapezoidal funnel structure through the upper opening of the trapezoidal funnel structure along the inner wall of the trapezoidal funnel structure, and splashing of the converter slag is effectively prevented.
As a preferred embodiment, as shown in fig. 4, the trapezoid funnel structure 7 is surrounded by a splash guard 71, and a hydraulic top cylinder 72 for preventing converter slag from adhering to the inner wall of the splash guard is mounted on at least one side wall of the splash guard, the hydraulic top cylinder 72 is mounted on the outer wall of the splash guard, and a mounting hole 74 is formed on the outer wall of the splash guard corresponding to the hydraulic top cylinder.
In a preferred embodiment, the fixed end of the hydraulic cylinder 72 is fixedly installed at the edge of the splash guard outer wall installation hole 74 through a cylinder body 73, and the top of the hydraulic cylinder 72 is located inside the installation hole 74. During operation, the hydraulic top cylinder top head is used for carrying out high-frequency impact in the mounting hole to form vibration, so that converter slag on the inner wall of the splash-proof guard plate falls off from the surface of the splash-proof guard plate, and the converter slag is prevented from being adhered to the inner wall of the splash-proof guard plate.
In a preferred embodiment, the splash guard 71 comprises a corrosion-resistant stainless steel plate 711, a heat-insulating cotton 712 and a protective galvanized plate 713 from inside to outside, wherein the thickness of the corrosion-resistant stainless steel plate is preferably 30 mm.
The embodiment also provides a power generation method of the converter slag heat-taking power generation system, which comprises the following steps:
step one, dumping the converter to enable the slag to fall into a slag casting hopper, and casting the slag into a blocky slag block;
secondly, the casting slag hopper enters a waste heat recovery boiler under the conveying action of a casting slag hopper conveying system;
step three, when the slag blocks pass through a converter slag steam Rankine cycle power generation system in movement, heat is conducted to a waste heat boiler tube by utilizing radiation heat transfer, so that steam with higher temperature is directly generated for power generation;
and step four, heating the air of the waste heat recovery boiler by utilizing the slag blocks to form hot air, and conveying the hot air to a converter slag thermal semiconductor temperature difference power generation system for power generation. In the actual operation process, the system can be built under a plurality of converter furnaces and run in parallel, the problem that intermittent deslagging of the converters affects unstable operation of vapor pressure is solved, and stable operation of a power generation system is guaranteed.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The converter slag heat-taking power generation system is characterized by comprising a cast slag hopper, a waste heat recovery boiler and a cast slag hopper conveying system for circularly conveying the cast slag hopper between the position under a converter and the waste heat recovery boiler, wherein a converter slag water vapor Rankine cycle power generation system and a converter slag thermal semiconductor temperature difference power generation system are sequentially arranged in the waste heat recovery boiler along the conveying direction of the cast slag hopper, and a cold air sending port is formed in the side wall of the waste heat recovery boiler.
2. The converter slag thermal power generation system of claim 1, wherein the converter slag steam Rankine cycle power generation system is located in the heat recovery boiler directly above the slag hopper near the inlet.
3. The converter slag heat-extraction power generation system according to claim 2, wherein the converter slag steam Rankine cycle power generation system comprises a waste heat boiler tube, a water inlet of the waste heat boiler tube is connected with a condenser, and a water outlet of the waste heat boiler tube is connected with a steam turbine power generation system.
4. The converter slag heat recovery power generation system of claim 3, wherein the waste heat boiler tubes are serpentine tube rows.
5. The converter slag heat-extraction power generation system according to claim 3, wherein a cooling air port is formed in the side wall of the waste heat recovery boiler at a position below the slag-casting hopper.
6. The converter slag heat recovery power generation system according to any one of claims 1 to 5, wherein the converter slag thermal semiconductor temperature difference power generation system is located above one end of the heat recovery boiler near the outlet, and a cooling air inlet is formed in a side wall of the heat recovery boiler at a position between the converter slag steam Rankine cycle power generation system and the converter slag thermal semiconductor temperature difference power generation system.
7. The converter slag heat-taking power generation system according to claim 6, wherein the converter slag heat semiconductor temperature difference power generation system comprises a hot air collection header pipe, a hot end heat exchanger, a cold end heat exchanger, a conducting strip, a P-type semiconductor power generation chip and an N-type semiconductor power generation chip, an outlet of the hot air collection header pipe is connected with an inlet of the hot end heat exchanger, and the hot end heat exchanger and the cold end heat exchanger are both of tubular structures and are arranged in parallel along the length direction; the conducting strips are alternately arranged on the outer side walls of the hot end heat exchanger and the cold end heat exchanger at positions close to one side of each other along the length direction of the hot end heat exchanger, and the P-type semiconductor power generation chip and the N-type semiconductor power generation chip alternately connect the end parts of the conducting strips on the outer side walls of the hot end heat exchanger and the cold end heat exchanger in series to form a semiconductor temperature difference power generation structure.
8. The converter slag heat-extraction power generation system according to claim 7, wherein a hot-end insulating heat transfer layer is arranged between the conducting strip and the outer side wall of the hot-end heat exchanger; and a cold end insulating heat transfer layer is arranged between the conducting strip and the outer side wall of the cold end heat exchanger.
9. The converter slag heat-extraction power generation system as claimed in claim 1, wherein the slag hopper conveying system comprises two horizontally arranged driving gears, and a conveying chain mounted on the surfaces of the two driving gears, and the slag hopper is mounted on the conveying chain and can move along with the conveying chain.
10. The method for generating power in a converter slag heat recovery power generation system according to any one of claims 1 to 5 and 7 to 9, comprising the steps of:
step one, dumping the converter to enable the slag to fall into a slag casting hopper, and casting the slag into a blocky slag block;
secondly, the casting slag hopper enters a waste heat recovery boiler under the conveying action of a casting slag hopper conveying system;
step three, when the slag blocks pass through a converter slag steam Rankine cycle power generation system in movement, heat is conducted to a waste heat boiler tube by utilizing radiation heat transfer, so that steam with higher temperature is directly generated for power generation;
and step four, heating the air of the waste heat recovery boiler by utilizing the slag blocks to form hot air, and conveying the hot air to a converter slag thermal semiconductor temperature difference power generation system for power generation.
CN202210400480.5A 2022-04-16 2022-04-16 Converter slag heat-extraction power generation system and power generation method thereof Active CN114909195B (en)

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JP2002310572A (en) * 2001-04-13 2002-10-23 Takuma Co Ltd Slag cooling conveyor system
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CN109182625A (en) * 2018-08-27 2019-01-11 浙江哈斯科节能技术有限公司 A method of hot melt steel slag dry method cooling system and waste heat recycle
CN111733303A (en) * 2020-08-05 2020-10-02 高建勋 Blast furnace slag comprehensive utilization system and method
CN114046506A (en) * 2021-12-09 2022-02-15 中国华能集团清洁能源技术研究院有限公司 Waste incineration waste heat utilization device and method for recycling heat of flue gas furnace slag

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002310572A (en) * 2001-04-13 2002-10-23 Takuma Co Ltd Slag cooling conveyor system
CN102072641A (en) * 2010-12-22 2011-05-25 中国科学院广州能源研究所 Generating system using surface residual heat of dry cement rotary kiln
CN105132604A (en) * 2015-08-17 2015-12-09 北京中冶设备研究设计总院有限公司 Slag casting heat removing device and method
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CN111733303A (en) * 2020-08-05 2020-10-02 高建勋 Blast furnace slag comprehensive utilization system and method
CN114046506A (en) * 2021-12-09 2022-02-15 中国华能集团清洁能源技术研究院有限公司 Waste incineration waste heat utilization device and method for recycling heat of flue gas furnace slag

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