CN108302950B - Slag waste heat utilization device - Google Patents
Slag waste heat utilization device Download PDFInfo
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- CN108302950B CN108302950B CN201810220462.2A CN201810220462A CN108302950B CN 108302950 B CN108302950 B CN 108302950B CN 201810220462 A CN201810220462 A CN 201810220462A CN 108302950 B CN108302950 B CN 108302950B
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- slag
- waste heat
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- water
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- 239000002893 slag Substances 0.000 title claims abstract description 178
- 239000002918 waste heat Substances 0.000 title claims abstract description 66
- 238000009423 ventilation Methods 0.000 claims abstract description 9
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 105
- 239000000428 dust Substances 0.000 claims description 15
- 230000005855 radiation Effects 0.000 claims description 11
- 230000005484 gravity Effects 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 238000011084 recovery Methods 0.000 abstract description 14
- 239000000463 material Substances 0.000 description 8
- 238000013178 mathematical model Methods 0.000 description 6
- 238000010248 power generation Methods 0.000 description 6
- 239000013585 weight reducing agent Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 229920006395 saturated elastomer Polymers 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000009845 electric arc furnace steelmaking Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000010884 boiler slag Substances 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 238000007885 magnetic separation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910001341 Crude steel Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000013473 artificial intelligence Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid group Chemical group S(O)(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention belongs to the technical field of waste heat utilization, and discloses a slag waste heat utilization device. The slag waste heat utilization device comprises a waste heat recoverer, wherein the waste heat recoverer is sequentially provided with an outer shell, an outer shell inner sleeve, an inner shell and an inner shell inner sleeve from outside to inside, an exhaust pipe is arranged between the outer shell and the outer shell inner sleeve in a penetrating manner, and slag trays are fixedly arranged at the bottoms of the inner shell and the inner shell inner sleeve; the inner shell sleeve and the slag disk are matched to form an air inlet cavity, and the inner shell sleeve, the inner shell and the slag disk are matched to form a slag storage cavity; the second slag stirrer is spirally distributed on the outer side of the inner shell, and the slag breaker is arranged on the inner side of the inner sleeve of the outer shell; the second slag stirrer is provided with a through hole, a ventilation pipe communicated with the air inlet cavity is arranged in the second slag stirrer, and the air inlet end of the exhaust pipe faces the slag storage cavity. According to the invention, a convection heat transfer heat exchange mode is additionally arranged in the existing slag waste heat recovery equipment, namely, the through hole of the second slag stirrer is utilized, and an air passage is formed by the through hole, the air inlet cavity, the ventilation pipe and the exhaust pipe, so that the heat exchange efficiency of the slag waste heat utilization device is further improved.
Description
Technical Field
The invention relates to the technical field of waste heat utilization, in particular to a slag waste heat utilization device.
Background
Slag is an inevitable by-product in the steelmaking process, and the discharge amount of the slag is about 12% -15% of the yield of the crude steel. The slag has a high sensible heat at 1500-1700 ℃, so the slag is one of main byproducts in the steel production process, belongs to high-grade waste heat resources, and has high recycling value. The reasonable utilization and effective recovery of slag can realize sustainable development of the steel industry, reduce the production cost, improve the economic benefit of enterprises, reduce pollution and change waste into valuable.
The patent with the application number of CN201510754750.2 discloses equipment and a method for recovering waste heat of slag in electric arc furnace steelmaking, which are mainly aimed at recovering waste heat of slag in electric arc furnace steelmaking and producing steam, and have the advantages of advancement and novelty. But this patent has the following disadvantages: 1) The application field is too narrow and is limited to the recovery of waste heat of the steelmaking slag of the electric arc furnace; 2) Only saturated steam can be generated, which is unfavorable for stable operation of the extended power generation; 3) The device has few regulation and control means, and is difficult to cope with the ever-changing industrial working conditions; 4) The heat exchange mechanism lacks convective heat transfer and has relatively low heat exchange efficiency.
Therefore, a new slag waste heat utilization device is needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a slag waste heat utilization device to solve the problem of low heat exchange efficiency of the existing slag waste heat recovery equipment.
To achieve the purpose, the invention adopts the following technical scheme:
the slag waste heat utilization device comprises a waste heat recoverer, wherein an outer shell, an outer shell inner sleeve, an inner shell and an inner shell inner sleeve are sequentially arranged on the waste heat recoverer from outside to inside, an exhaust pipe is arranged between the outer shell and the inner shell inner sleeve in a penetrating manner, slag plates are fixedly arranged at the bottoms of the inner shell and the inner shell inner sleeve, and the inner shell, the inner shell inner sleeve and the slag plates rotate relative to the outer shell and the outer shell inner sleeve;
the inner shell sleeve and the slag disk are matched to form an air inlet cavity, and the inner shell sleeve, the inner shell and the slag disk are matched to form a slag storage cavity; the outer shell and the inner shell are matched to form a first water inlet cavity, the inner shell and the inner shell are matched to form a second water inlet cavity, and the first water inlet cavity is communicated with the second water inlet cavity;
the inner side of the inner sleeve of the outer shell is provided with a slag breaker, and the inside of the slag breaker is communicated with the first water inlet cavity; the second slag stirrer is provided with a through hole, a ventilation pipe communicated with the air inlet cavity is arranged in the second slag stirrer, and the air inlet end of the exhaust pipe faces the slag storage cavity.
Preferably, the shell is internally sleeved into an integrated structure, a feed inlet is arranged at the top of the shell, and a feed hopper and a heat preservation cover are arranged at the feed inlet.
Preferably, the inner side of the shell inner sleeve is provided with a radiation heat exchange tube, and both ends of the radiation heat exchange tube are communicated with the shell inner sleeve.
Preferably, the interior of the first slag stirrer is communicated with the second water inlet cavity, and the volume of the first slag stirrer is larger than that of the second slag stirrer.
Preferably, the waste heat recovery device further comprises three sleeves arranged in the waste heat recovery device, wherein the three sleeves sequentially comprise a first pipe, a second pipe and a third pipe from outside to inside;
the outlet end of the first pipe is positioned in the air inlet cavity, and the inlet end of the first pipe is connected with the circulating fan;
the outlet end of the second pipe is provided with a water retaining cap and is positioned in the second water inlet cavity, and the inlet end of the second pipe is connected with the circulating water pump;
the inlet end of the third pipe is positioned in the first slag stirrer at the topmost end, and the outlet end of the third pipe is communicated with the first water inlet cavity.
Preferably, the system also comprises a heat exchange device, wherein the heat exchange device comprises a superheater, a gas-water heat exchanger and an economizer which are sequentially arranged from top to bottom.
Preferably, the steam turbine is further provided with an energy accumulator and a steam drum which are connected in parallel and are communicated with the top of the shell, the steam outlet end of the energy accumulator and the steam drum is connected with the steam turbine through a superheater, the water outlet end is respectively communicated with the inlet end of the second pipe and one end of the air-water heat exchanger through a circulating water pump, and the other end of the air-water heat exchanger is communicated with the steam drum.
Preferably, the outlet end of the exhaust pipe is sequentially connected with a cyclone dust collector and a gravity dust collector, the air outlet pipe of the gravity dust collector is communicated with the top end of the superheater, and the bottom end of the economizer is communicated with the circulating fan.
Preferably, the slag pan is rotatably arranged on the support sleeve through a bearing, a weight sensor is arranged in the support sleeve, and the controller is respectively and electrically connected with the hydraulic electromagnetic valve and the weight sensor.
Preferably, the slag pan is circumferentially provided with slag rings which cooperate with the housing to form slag holes, the slag holes being filled with water for cooling the slag.
The invention has the beneficial effects that:
according to the invention, a convection heat transfer heat exchange mode is additionally arranged in the existing slag waste heat recovery equipment, namely, the through hole of the second slag stirrer is utilized, and an air passage is formed by the through hole, the air inlet cavity, the ventilation pipe and the exhaust pipe, so that the heat exchange efficiency of the slag waste heat utilization device is further improved; the hot air extracted from the exhaust pipe is repeatedly dedusted by a cyclone dust collector and a gravity dust collector, and then the hot air passes through a superheater to overheat saturated steam from a steam drum, and the overheat steam is conveyed to a steam turbine for power generation; the hot air extracted from the exhaust pipe passes through the superheater, then passes through the air-water heat exchanger and the water in the economizer heating system, and the low-temperature hot air after heat exchange of the heater, the air-water heat exchanger and the economizer flows out from the bottom end of the economizer and enters the inlet of the circulating fan to provide cold air for the waste heat recovery device, so that the slag waste heat utilization device forms closed circulation heat absorption, heat carrying and heat transfer.
Drawings
FIG. 1 is a schematic diagram of a waste heat recoverer of a slag waste heat utilization device provided by the invention;
FIG. 2 is a schematic structural view of the slag waste heat utilization device provided by the invention;
fig. 3 is a schematic structural view of a power generation part of a steam turbine of the slag waste heat utilization device provided by the invention.
In the figure:
1. a waste heat recoverer; 11. a housing; 12. an inner housing; 13. an inner case; 14. an inner housing; 15. an exhaust tube; 16. a slag pan; 17. slag ring;
21. a first slag stirrer; 22. a second slag stirrer; 23. a slag breaker; 24. a ventilation pipe;
31. a feed hopper; 32. a thermal insulation cover; 33. a radiant heat exchange tube;
41. a first tube; 42. a second tube; 43. a third tube;
51. a superheater; 52. a gas-water heat exchanger; 53. an economizer; 54. a steam turbine; 55. a generator; 56. a condenser; 57. a cooling tower; 58. a cool water tank;
61. an accumulator; 62. a steam drum; 63. a circulating water pump;
71. a cyclone dust collector; 72. a gravity dust remover; 73. a circulating fan;
81. a support sleeve; 82. a weight sensor;
91. a discharge chute; 92. a conveyor belt; 93. lifting the hopper; 94. a hoist; 95. magnetic separation belt machine; 96. a storage bin; 97. a scrap steel bin; 98. and (5) a material transporting vehicle.
Detailed Description
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
As shown in fig. 1, the waste heat recoverer 1 of the slag waste heat utilization device provided by the invention is provided with an outer shell 11, an inner shell 12, an inner shell 13 and an inner shell inner sleeve 14 from outside to inside in sequence, wherein the inner shell 13 and the inner shell inner sleeve 14 form a truncated cone-like structure, and the truncated cone-like structure are fixedly arranged on a slag pan 16. Wherein:
the outer shell inner sleeve 12, the inner shell 13 and the slag pan 16 are matched to form a slag storage cavity, the outer shell 11 and the outer shell inner sleeve 12 are matched to form a first water inlet cavity, the inner shell 13 and the inner shell inner sleeve 14 are matched to form a second water inlet cavity, the first water inlet cavity and the second water inlet cavity are communicated through a pipeline, and the waste heat recovery device 1 conducts heat transfer with slag through the first water inlet cavity and the second water inlet cavity.
The inner shell sleeve 14 and the slag pan 16 are matched to form an air inlet cavity, a first slag stirrer 21 and a second slag stirrer 22 positioned below the first slag stirrer 21 are spirally distributed on the outer side of the inner shell 13, a slag breaker 23 is arranged on the inner side of the outer shell inner sleeve 12, and the inner part of the slag breaker 23 is communicated with the first water inlet cavity; an exhaust pipe 15 is arranged between the outer shell 11 and the inner shell 12 in a penetrating way, a through hole (not shown in the figure) is arranged in the second slag stirrer 22, a ventilation pipe 24 communicated with the air inlet cavity is arranged in the second slag stirrer 22, the air inlet end of the exhaust pipe 15 faces the slag storage cavity, and the waste heat recoverer 1 utilizes the through hole of the second slag stirrer 22 and performs convection heat transfer on slag with an air passage formed by the air inlet cavity, the ventilation pipe 24 and the exhaust pipe 15.
The inner side of the shell inner sleeve 12 is provided with a radiation heat exchange tube 33, both ends of the radiation heat exchange tube 33 are communicated with the shell inner sleeve 12, and the waste heat recoverer 1 performs radiation heat transfer on slag by using the radiation heat exchange tube 33. The invention makes the heat exchange efficiency more efficient compared with the prior slag waste heat utilization device through newly added convection heat transfer and radiation heat transfer.
Specifically, the inner housing 13, the inner housing 14 and the slag pan 16 rotate relative to the outer housing 11 and the inner housing 12, and when the inner housing 13, the inner housing 14 and the slag pan 16 rotate, the rotation direction is always kept opposite to the direction of the spiral descending trend of the first slag stirrer 21 and the second slag stirrer 22, so that the first slag stirrer 21 and the second slag stirrer 22 can generate better crushing effect on slag in the slag storage cavity, and simultaneously can generate downward pressure on the slag, so that the slag can be extruded out of the slag storage cavity more easily. Further, the volume of the first slag stirrer 21 is larger than that of the second slag stirrer 22, the first slag stirrer 21 mainly plays a role in stirring slag, and the second slag stirrer 22 and the slag breaker 23 mainly play a role in tearing molten slag, so that the volume of the slag is torn smaller, and sufficient heat exchange is facilitated.
Specifically, the inner housing sleeve 12 is of an integral structure, a feed inlet is formed in the top of the inner housing sleeve 11, a feed hopper 31 and a heat insulation cover 32 are arranged at the feed inlet, and the heat insulation cover 32 is screwed down through a T-shaped bolt (not shown in the figure). Compared with the open-type shell inner sleeve in the existing waste heat utilization device (such as the Chinese patent application No. CN 201510754750.2), the heat exchange area (namely the first water inlet cavity) at the feed inlet is larger, and the heat loss is further prevented by adding the heat preservation cover 32, so that the heat exchange efficiency is improved. Specifically, the position sensor, the controller and the hydraulic cylinder (not shown in the figure) are further arranged at the feed inlet, when the loading tank filled with slag is close to the feed inlet, the loading tank triggers the position sensor, the position sensor sends a signal to the controller, the controller controls the hydraulic cylinder to advance, the T-shaped bolt is pushed to rotate, the heat preservation cover 32 is driven to be opened, the loading tank fully pours slag into the slag storage cavity and leaves, the position sensor cannot detect the loading tank, and the controller controls the hydraulic cylinder to retract to cover the heat preservation cover 32.
Specifically, the inner shell 13 and the inner shell inner sleeve 14 form a truncated cone-like structure, the inner shell 13 and the inner shell inner sleeve 14 are fixedly arranged on the slag pan 16, the slag pan 16 is rotatably arranged on the support sleeve 81 through a bearing (not shown in the figure) at the bottom of the slag pan 16, and a weight sensor 82 is arranged in the support sleeve 81. The slag waste heat utilization device further comprises a controller and a hydraulic solenoid valve (not shown in the figure), and the controller is respectively electrically connected with the hydraulic solenoid valve and the weight sensor 82. When slag is poured into the slag storage cavity, the weight sensor 82 transmits a weight sudden increase signal to the controller, the controller starts a weight reduction mathematical model after receiving the weight sensor 82 signal, and controls the hydraulic electromagnetic valve to increase the oil supply amount so as to accelerate the rotation speed of the slag pan 16 and the slag discharging speed of slag, and simultaneously, the controller also controls the opening of circulating water and air quantity so as to accelerate heat exchange and heat transfer. When the minimum preset weight is detected by the weight sensor 82 after the slag is gradually extruded out of the slag storage cavity, the signal is transmitted to the controller, the controller stops the operation of the weight reduction mathematical model, returns to the normal operation mode, and controls the hydraulic solenoid valve to reduce the oil supply amount so as to slow down the rotation speed of the slag pan 16 and the slag tapping speed of the slag. In summary, the controller adopts a mathematical model of weight reduction method, and a computer automatically controls the hydraulic electromagnetic valve, so as to further control the advancing speed of the hydraulic oil cylinder, namely the rotating speed of the slag pan 16 and the slag discharging speed of slag, so as to further ensure that the waste heat recovery is matched with the production cycle.
Specifically, the slag waste heat utilization device further comprises three sleeves arranged inside the waste heat recoverer 1, wherein the three sleeves sequentially comprise a first pipe 41, a second pipe 42 and a third pipe 43 from outside to inside. Wherein:
the outlet end of the first pipe 41 is positioned in the air inlet cavity, and the inlet end is connected with a circulating fan 73 (shown in fig. 2);
the outlet end of the second pipe 42 is provided with a water retaining cap and is positioned in the second water inlet cavity, and the inlet end is connected with a circulating water pump 63 (shown in figure 2);
the inlet end of the third pipe 43 is positioned in the first slag stirrer 21 at the top end, the outlet end of the third pipe is communicated with the first water inlet cavity, and the interior of the first slag stirrer 21 is communicated with the second water inlet cavity.
Referring to fig. 2, the slag waste heat utilization device further includes an accumulator 61 and a drum 62 connected in parallel and each connected to the top of the housing 11, wherein the accumulator 61 is located above the drum 62, so that the steam-water mixture from the first water inlet chamber first enters the drum 62. When the controller starts the weight reduction mathematical model, the controller controls the inlet valve of the accumulator 61 to be opened, the outlet valve to be closed and the outlet valve to be slightly opened, and at this time, excessive superheated water is stored in the accumulator 61. After the controller stops the operation of the weight reduction mathematical model, the inlet valve of the accumulator 61 is closed, so that the accumulator 61 is not supplemented with energy storage water (i.e. superheated water), and meanwhile, the circulating water pump 63 and the circulating fan 73 are subjected to variable frequency speed reduction, so that the water and gas circulation quantity is reduced, and the superheated water temperature and the hot air temperature are ensured to be in accordance with the set value range of the system. Specifically, the steam outlet ends of the accumulator 61 and the steam drum 62 are provided with a steam flowmeter (not shown in the figure) and are connected with the steam turbine 54 through the superheater 51, when the steam flowmeter detects that the steam flow is insufficient, the opening of the steam outlet valve of the accumulator 61 is automatically opened, and superheated water stored in the accumulator 61 is flashed at this time to supplement the steam flow, so that the supplement steam flow reaches a normal value and the normal operation of the steam turbine 54 is ensured.
Referring to fig. 3, superheated steam enters a steam turbine 54 to drive a generator 55 to generate electricity, and the generated electricity is connected to a steel mill (not connected to the internet). After the superheated steam releases energy to generate electricity, low-pressure low-temperature steam at the outlet of the steam turbine 54 enters the condenser 56, is cooled into distilled water by cooling water pumped from the cooling water tank 58 by a cooling water pump (not shown), and overflows into the cooling water tank 58 after being cooled by the cooling tower 57 after being subjected to heat exchange and temperature rise. Distilled water is sent to the economizer 53 through a condensate pump (not shown in the figure) to exchange heat with hot air to raise the temperature and heat the temperature to 108 ℃ for deoxidation, and then sent to the inlet of the circulating water pump 63 by a booster pump (not shown in the figure) to be used as system supplementing water.
With continued reference to fig. 2, the slag waste heat utilization device further includes a heat exchange apparatus including a superheater 51, a gas-water heat exchanger 52 and an economizer 53, which are sequentially disposed from top to bottom. The accumulator 61 and the water outlet end of the steam drum 62 are respectively communicated with the inlet end of the second pipe 42 and one end of the air-water heat exchanger 52 through the circulating water pump 63, and the other end of the air-water heat exchanger 52 is communicated with the steam drum 62. The circulating water increased by the circulating water pump 63 flows into the second water inlet cavity and the first water inlet cavity through the second pipe 42 in the three sleeves, when the circulating water pump 63 drives the circulating water into the second water inlet cavity, the water flows into the second water inlet cavity through the water retaining cap to diffuse to the periphery, the whole second water inlet cavity is filled, the water level gradually rises until flowing into the first slag stirrer 21 positioned at the top end, the circulating water flows back into the third pipe 43, the third pipe 43 is communicated with the first water inlet cavity, the water flow gradually fills the whole first water inlet cavity, and the water in the first water inlet cavity and the second water inlet cavity and slag in the slag storage cavity realize conduction heat transfer together. By communicating both ends of the air-water heat exchanger 52 with the circulation water pump 63 and the drum 62, respectively, the circulation water split by the circulation water pump 63 is heated to superheated water and then returned to the drum 62 to evaporate into saturated steam.
With continued reference to fig. 2, the outlet end of the exhaust pipe 15 is sequentially connected to a cyclone dust collector 71 and a gravity dust collector 72, the air outlet pipe of the gravity dust collector 72 is communicated with the top end of the superheater 51, and the bottom end of the economizer 53 is communicated with a circulating fan 73. The circulation fan 73 blows cold air formed after heat exchange of the heat exchange equipment into the first pipe 41, the cold air sequentially passes through the air inlet cavity, the ventilation pipe 24, the through hole of the second slag stirrer 22, the slag storage cavity and the exhaust pipe 15, air after gradual temperature rise is sucked out through the exhaust pipe 15, hot air enters the cyclone 71 and the gravity dust remover 72 to remove most dust particles, then enters the superheater 51 to superheat saturated steam generated by the steam drum 62, then enters the air-water heat exchanger 52 and the economizer 53 to heat water, the air temperature of the hot air is reduced and then enters the inlet of the circulation fan 73, and then the hot air is blown into the waste heat recoverer 1.
With continued reference to fig. 1, slag pan 16 is circumferentially provided with slag collar 17, slag collar 17 cooperating with housing 11 to form a slag hole filled with water for cooling slag. The slag added into the waste heat recoverer 1 is driven by a hydraulic oil cylinder to rotate together with a slag pan 16, an inner shell 13 and an inner shell inner sleeve 14, and is crushed step by a second slag stirrer 22 and a slag crusher 23 while transferring heat to circulating water and circulating air, and gradually descends until all the slag falls into water stored in a slag hole, low-temperature waste heat higher than 100 ℃ is transferred to the stored water, water vapor formed after the stored water is heated rises to a fragment gap with higher temperature, heat is further absorbed and raised, the water vapor becomes a medium with better heat carrying capacity than air (namely, air with higher moisture content) is mixed with the heated hot air, the mixture is pumped out together from an exhaust pipe 15, and the carried heat is transferred to saturated steam, circulating water and supplementing water.
With continued reference to fig. 2, the automatically rolled cold crushed material blocks fall onto the discharge chute 91 and onto the conveyor belt 92 at the lower part of the discharge chute 91, and finally fall into the lifting hopper 93, an electronic weight sensor (not shown) is installed under the lifting hopper 93, when the lifting hopper 93 is full of material, the electronic sensor starts the lifting winch 94 to lift the lifting hopper 93 to a position where the skip is dumped (i.e. the top position of the winch 94) to stop, and simultaneously stops the conveyor belt 92 from running, the crushed material blocks falling onto the discharge chute 91 are temporarily accumulated in the discharge chute 91, and when the lifting hopper 93 falls to the original position, the controller controls the winch 94 to stop rotating and the conveyor belt 92 to start running to feed. After the lifting hopper 93 ascends and the skip bucket is used for pouring, the magnetic separation belt conveyor 95 operates, crushed iron blocks in the crushed material blocks are selected and fall into the scrap steel bin 97, other crushed material blocks fall into the bin 96, and when the bin 96 is full, the crushed material blocks are transported away by the material transporting vehicle 98.
It is to be understood that the present invention is not limited to slag, and may be, for example, liquid heat-carrying objects such as electric arc furnace steelmaking slag, converter steelmaking slag, submerged arc furnace slag, alloy furnace slag, and pyrometallurgical copper smelting slag, solid heat-carrying objects such as fluidized bed boiler slag, boiling boiler slag, magnesium metal roasting residues, and roasting sulfuric acid residues, and solid heat-carrying objects such as sintered ores and pellets.
In summary, the invention has the following advantages based on the invention patent with the patent number ZL 201510754750.2:
1) An air circulation heat exchange system (namely, a heat exchange mode of convection heat exchange is additionally arranged) is added, so that the heat exchange efficiency of the waste heat utilization device is improved, and superheated steam can be generated at the same time;
2) The energy accumulator 61 is added, so that the contradiction between the changed waste heat recovery working condition and the balanced steam generation and stable power generation can be effectively regulated;
3) Means such as a weight reduction mathematical model control mode, a hydraulic electromagnetic valve, a frequency converter and the like are introduced, and the waste heat recovery power generation system is easy to match with the production working condition of a heat-carrying object;
4) The whole process is controlled by artificial intelligence, so that the waste heat recovery power generation system is safe, efficient, simple, accurate and compact;
5) The heat insulation cover 32 of the feed inlet, all heat exchange equipment and pipelines are added for thickening and heat insulation, so that the heat loss is less, and the waste heat recovery rate is high;
6) The radiation heat exchange tube 33 arranged on the inner side of the shell inner sleeve 12 is added, so that high-temperature radiation heat transfer is fully utilized, and the heat exchange efficiency is further accelerated.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above description will be apparent to persons of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. The slag waste heat utilization device comprises a waste heat recoverer (1), and is characterized in that the waste heat recoverer (1) is sequentially provided with an outer shell (11), an outer shell inner sleeve (12), an inner shell (13) and an inner shell inner sleeve (14) from outside to inside, an exhaust pipe (15) is arranged between the outer shell (11) and the outer shell inner sleeve (12) in a penetrating manner, slag trays (16) are fixedly arranged at the bottoms of the inner shell (13) and the inner shell inner sleeve (14), and the inner shell (13), the inner shell inner sleeve (14) and the slag trays (16) rotate relative to the outer shell (11) and the outer shell inner sleeve (12);
the inner shell inner sleeve (14) is matched with the slag pan (16) to form an air inlet cavity, and the outer shell inner sleeve (12), the inner shell (13) and the slag pan (16) are matched to form a slag storage cavity; the outer shell (11) and the inner shell sleeve (12) are matched to form a first water inlet cavity, the inner shell (13) and the inner shell sleeve (14) are matched to form a second water inlet cavity, and the first water inlet cavity is communicated with the second water inlet cavity;
a first slag stirrer (21) and a second slag stirrer (22) positioned below the first slag stirrer (21) are spirally distributed on the outer side of the inner shell (13), a slag breaker (23) is arranged on the inner side of the inner sleeve (12) of the outer shell, and the inner part of the slag breaker (23) is communicated with the first water inlet cavity; the second slag stirrer (22) is provided with a through hole, a ventilation pipe (24) communicated with the air inlet cavity is arranged in the second slag stirrer (22), and the air inlet end of the exhaust pipe (15) faces the slag storage cavity.
2. The slag waste heat utilization device according to claim 1, wherein the shell inner sleeve (12) is of an integrated structure, a feed inlet is formed in the top of the shell (11), and a feed hopper (31) and a heat preservation cover (32) are arranged at the feed inlet.
3. The slag waste heat utilization device according to claim 1, wherein a radiation heat exchange tube (33) is provided on the inner side of the housing inner sleeve (12), and both ends of the radiation heat exchange tube (33) are communicated with the housing inner sleeve (12).
4. The slag waste heat utilization device according to claim 1, characterized in that the interior of the first slag stirrer (21) is in communication with the second water inlet chamber, and the volume of the first slag stirrer (21) is larger than the volume of the second slag stirrer (22).
5. The slag waste heat utilization device according to claim 4, further comprising three sleeves arranged inside the waste heat recoverer (1), wherein the three sleeves sequentially comprise a first pipe (41), a second pipe (42) and a third pipe (43) from outside to inside;
the outlet end of the first pipe (41) is positioned in the air inlet cavity, and the inlet end of the first pipe is connected with the circulating fan (73);
the outlet end of the second pipe (42) is provided with a water retaining cap and is positioned in the second water inlet cavity, and the inlet end of the second pipe is connected with a circulating water pump (63);
the inlet end of the third pipe (43) is positioned in the first slag stirrer (21) at the topmost end, and the outlet end of the third pipe is communicated with the first water inlet cavity.
6. The slag waste heat utilization device according to claim 5, further comprising a heat exchange apparatus comprising a superheater (51), a gas-water heat exchanger (52) and an economizer (53) arranged in this order from top to bottom.
7. The slag waste heat utilization device according to claim 6, further comprising an accumulator (61) and a steam drum (62) which are connected in parallel and are both communicated with the top of the housing (11), wherein the accumulator (61) and the steam drum (62) are connected at the steam outlet end with a steam turbine (54) through the superheater (51), the water outlet end is respectively communicated with the inlet end of the second pipe (42) and one end of the gas-water heat exchanger (52) through the circulating water pump (63), and the other end of the gas-water heat exchanger (52) is communicated with the steam drum (62).
8. The slag waste heat utilization device according to claim 6, wherein the outlet end of the exhaust pipe (15) is sequentially connected with a cyclone dust collector (71) and a gravity dust collector (72), the air outlet pipe of the gravity dust collector (72) is communicated with the top end of the superheater (51), and the bottom end of the economizer (53) is communicated with the circulating fan (73).
9. The slag waste heat utilization device according to claim 1, further comprising a controller and a hydraulic electromagnetic valve, wherein the slag pan (16) is rotatably arranged on the support sleeve (81) through a bearing, a weight sensor (82) is arranged in the support sleeve (81), and the controller is respectively electrically connected with the hydraulic electromagnetic valve and the weight sensor (82).
10. The slag waste heat utilization device according to any one of claims 1-9, characterized in that the slag pan (16) is provided with a slag collar (17) circumferentially, the slag collar (17) cooperating with the housing (11) to form a slag hole, which is filled with water for cooling the slag.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810220462.2A CN108302950B (en) | 2018-03-16 | 2018-03-16 | Slag waste heat utilization device |
| PCT/CN2018/115146 WO2019174287A1 (en) | 2018-03-16 | 2018-11-13 | Slag residual heat utilization device and molten slag granulation method |
| JP2020554348A JP7179868B2 (en) | 2018-03-16 | 2018-11-13 | Slag residual heat utilization device and molten slag granulation method |
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| CN201810220462.2A CN108302950B (en) | 2018-03-16 | 2018-03-16 | Slag waste heat utilization device |
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| CN108302950B true CN108302950B (en) | 2024-04-12 |
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| JP7179868B2 (en) * | 2018-03-16 | 2022-11-29 | 南京有▲栄▼▲節▼能科技有限公司 | Slag residual heat utilization device and molten slag granulation method |
| CN109250719A (en) * | 2018-07-22 | 2019-01-22 | 安徽华塑股份有限公司 | A kind of residual neat recovering system and its application method in calcium carbide production process |
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