CN116987833B - Hot air energy storage unit and molten steel slag waste heat recovery and utilization system - Google Patents
Hot air energy storage unit and molten steel slag waste heat recovery and utilization system Download PDFInfo
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- CN116987833B CN116987833B CN202311242159.XA CN202311242159A CN116987833B CN 116987833 B CN116987833 B CN 116987833B CN 202311242159 A CN202311242159 A CN 202311242159A CN 116987833 B CN116987833 B CN 116987833B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 61
- 239000010959 steel Substances 0.000 title claims abstract description 61
- 239000002893 slag Substances 0.000 title claims abstract description 60
- 238000004146 energy storage Methods 0.000 title claims abstract description 29
- 238000011084 recovery Methods 0.000 title claims abstract description 23
- 239000002918 waste heat Substances 0.000 title claims abstract description 22
- 230000008859 change Effects 0.000 claims abstract description 48
- 230000029087 digestion Effects 0.000 claims abstract description 27
- 238000005096 rolling process Methods 0.000 claims abstract description 18
- 238000001035 drying Methods 0.000 claims abstract description 14
- 239000012782 phase change material Substances 0.000 claims description 82
- 239000007789 gas Substances 0.000 claims description 48
- 230000000903 blocking effect Effects 0.000 claims description 29
- 230000005540 biological transmission Effects 0.000 claims description 21
- 238000007664 blowing Methods 0.000 claims description 7
- 238000009826 distribution Methods 0.000 claims description 5
- 210000001503 joint Anatomy 0.000 claims description 2
- 238000009423 ventilation Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 7
- 229910000640 Fe alloy Inorganic materials 0.000 abstract description 2
- 230000009466 transformation Effects 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 13
- 229910002804 graphite Inorganic materials 0.000 description 13
- 239000010439 graphite Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 11
- ZZQONARHCZFIRY-UHFFFAOYSA-N acetamide octadecanoic acid Chemical compound C(CCCCCCCCCCCCCCCCC)(=O)O.C(C)(=O)N ZZQONARHCZFIRY-UHFFFAOYSA-N 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 239000002131 composite material Substances 0.000 description 8
- 239000000428 dust Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 238000005457 optimization Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Furnace Details (AREA)
Abstract
The application relates to the technical field of treatment of iron alloy in a molten state, and discloses a hot air energy storage unit and a molten steel slag waste heat recovery and utilization system, which comprises a hot air energy storage unit, wherein a main pipeline of the hot air energy storage unit is connected with a steel slag rolling crushing device; the two-phase transformation structure of the hot air energy storage unit is connected with the drying digestion device and the vertical mill equipment; the hot air energy storage unit comprises a pipeline, the pipeline comprises a main pipeline and branch pipelines, the inlet end of the main pipeline is used for being connected with the heat generating equipment, the outlet end of the main pipeline is connected with at least two pipelines, and the branch pipelines are provided with stop valves; the free end of the branch pipeline is connected with a phase change structure, and the phase change structure is connected with heat receiving equipment; the application solves the problem that heat loss is caused by adopting a hot-disintegrating technology to treat molten steel slag.
Description
Technical Field
The application relates to the technical field of treatment of iron alloy in a molten state, in particular to a hot air energy storage unit and a molten steel slag waste heat recovery and utilization system.
Background
At present, when steel is smelted in a steel mill, a large amount of molten steel slag is generated, and the temperature of the molten steel slag just discharged from the iron-smelting furnace can reach more than 1000 ℃; in the prior art, various treatment technologies for molten steel slag, such as hot splashing, wind quenching, a roller method and the like exist, but the metal recovery rate is low, the hidden danger of the stability of the tailings cannot be solved, and the zero emission of the steel slag cannot be realized, so that the existing molten steel slag is usually treated by a hot-closed method, the technology can realize the separation of slag and iron, solve the hidden danger of poor stability in the tailings, and provide technical support for realizing the zero emission of the steel slag; related hot disintegrating technology of molten steel slag is disclosed in China patent library, for example, patent document with publication number CN101967533A discloses a rotary type steam discharging and dust removing method and device for a hot disintegrating device, comprising a rotary device, a flue gas collecting device, a spraying device and an exhaust pipeline; the rotating device comprises a driving device, a bend pulley device and a supporting device; the flue gas collecting device comprises a gas collecting hood and a conveying pipeline; the spraying device comprises a water pipe and an atomizing nozzle; the exhaust duct includes a metal hose and a main exhaust duct.
Also for example, in the patent document with publication number CN114735954B, a method for treating converter steel slag by hot-disintegrating is disclosed, which comprises alternately spraying water mist to cool down the molten steel slag and crushing by rolling, and then hot-disintegrating in a disintegrating pit.
The hot disintegrating technology of the molten steel slag disclosed above has the following problems: the heat generated by the molten steel slag is not collected or utilized, so that a large amount of heat is lost to waste energy.
Disclosure of Invention
In view of the above, the application aims to provide a hot air energy storage unit and a molten steel slag waste heat recovery and utilization system, which solve the problem that heat loss is caused by adopting a hot-disintegrating technology to treat molten steel slag.
In a first aspect, the application discloses a hot air energy storage unit, which comprises a pipeline, wherein the pipeline comprises a main pipeline and branch pipelines, the inlet end of the main pipeline is used for being connected with heat generating equipment, the outlet end of the main pipeline is connected with at least two branch pipelines, and a stop valve is arranged on each branch pipeline; the free end of the branch pipe is connected with a phase change structure which is used for being connected with heat receiving equipment.
A further defining scheme of the phase change structure is as follows: the phase change structure comprises a phase change bin body, wherein the phase change bin body is respectively provided with an air inlet nozzle and an air outlet nozzle, the air inlet nozzle is connected with the free end of the branch pipeline, and the air outlet nozzle is used for being connected with heat receiving equipment; the phase change bin body is internally provided with a phase change member, and a phase change material is arranged on the phase change member; the main bin is connected with an air blowing nozzle which is connected with the blower through an air duct.
The further limiting scheme of the phase change bin body is as follows: the phase change bin body comprises a main bin, a buffer bin and a base, the base is arranged at the bottom of the main bin, the top of the main bin is connected with the buffer bin, and the buffer bin is connected with an air outlet nozzle; the main bin is provided with an air inlet nozzle, and the main bin is internally provided with a phase change member.
A further definition of the phase change member is as follows: the phase change member comprises a power shaft, two ends of the power shaft are respectively and rotatably connected with the top of the main bin and the base, the power shaft is of a cavity structure, the cavity of the power shaft is communicated with the cache bin, and a diversion hole is formed in the power shaft; at least two support shafts are arranged on the power shaft, and the support shafts are connected with a phase change material placing shaft for placing phase change materials.
As a preferable scheme of the hot air energy storage unit: the phase change member is provided with a rotating member, wherein the rotating member comprises an annular fluted disc which is sleeved on the power shaft and forms clearance fit with the power shaft; the annular fluted disc is fixedly connected to the main bin, the phase change material placing shaft is rotationally connected with the support shaft, one end of the phase change material placing shaft is connected with the transmission gear, and the transmission gear is meshed with the annular fluted disc to form linkage; the power shaft is connected with a power source for driving the power shaft to rotate.
As a preferable embodiment of the rotating member: the support shaft is rotatably connected with another phase change material placing shaft, the phase change material placing shaft is connected with a pinion, and the pinion is meshed with the transmission gear to form linkage.
The application discloses a molten steel slag waste heat recovery and utilization system, which comprises a hot air energy storage unit, wherein a main pipeline of the hot air energy storage unit is connected with a steel slag rolling crushing device; the two-phase transformation structure of the hot air energy storage unit is connected with the drying digestion device and the vertical mill equipment.
The further limiting scheme of the steel slag rolling and crushing device is as follows: the steel slag rolling and crushing device comprises a box body, wherein a chain plate conveyor and a crushing roller are arranged in the box body, the crushing roller is arranged on the chain plate conveyor, and a turning hopper is arranged on the box body above the crushing roller; the box body is provided with a driving motor which is used for driving the turning hopper to turn over; a buffer hopper is arranged below the box body, and the other end of the chain plate conveyor extends to the upper part of the buffer hopper; the box body is provided with a gas transmission hole which is connected with the main pipeline.
A further limiting scheme of the drying digestion device is as follows: the drying digestion device comprises a digestion bin, a feed inlet is formed in the top of the digestion bin, a discharger is arranged at the bottom of the digestion bin, a hopper is arranged below the discharger, and a quantitative feeder is arranged at the bottom of the hopper.
As an optimization scheme of a molten steel slag waste heat recovery and utilization system: the molten steel slag waste heat recovery and utilization system further comprises an explosion-proof unit, wherein the explosion-proof unit is arranged at the joint of the main pipeline and the branch pipeline; when the pressure of hot gas in the main pipeline is smaller than the pressure of an elastic part of the explosion-proof unit, the explosion-proof unit seals the joint of the main pipeline and the branch pipeline; when the pressure of hot gas in the main pipeline is greater than the pressure of the elastic component of the explosion-proof unit, the explosion-proof unit is separated from the joint of the main pipeline and the branch pipeline.
The application has the beneficial effects that:
the application can temporarily store the heat generated in the heat generating equipment by combining the phase change structure, so as to avoid the problem that the heat loss is caused when the molten steel slag is subjected to the hot disintegrating treatment or crushing treatment; the application further combines with equipment such as a blower and the like to timely release heat in the phase change material when needed.
Drawings
Fig. 1 is a schematic diagram of a display structure of a hot air energy storage unit.
Fig. 2 is a schematic diagram of a cut-away view of a phase change structure.
FIG. 3 is a schematic diagram of the fry-open structure of the phase change cartridge body.
Fig. 4 is a schematic perspective view of a phase change material placement shaft after deformation.
FIG. 5 is a schematic diagram showing connection of the air tap and the blower.
FIG. 6 is a schematic diagram of an assembled structure of a rotating member, phase change member.
Fig. 7 is a schematic view of the mounting structure of the pinion gear and the corresponding phase change material placement shaft.
Fig. 8 is a schematic diagram of the overall structure of the molten steel slag waste heat recovery and utilization system.
Fig. 9 is a schematic structural view of a steel slag rolling and crushing device.
Fig. 10 is a schematic perspective view of a drying digestion apparatus.
Fig. 11 is a partial enlarged view at a in fig. 8.
Fig. 12 is a schematic view of a use structure of the explosion-proof unit.
Fig. 13 is a schematic view of an annular groove.
Fig. 14 is a perspective cut-away view of a blocking structure.
In the figure, a main pipe 1, a branch pipe 2, a stop valve 3, a phase change bin body 4, a main bin 401, a buffer bin 402, a base 403, a through hole 5, an air outlet 6, an air outlet 7, an air inlet nozzle 8, a phase change member 9, a power shaft 901, a guide hole 902, a fulcrum 903, a phase change material placement shaft 904, an air blowing nozzle 905, an air blower 906, a rotating member 10, an annular fluted disc 1001, a positioning column 1002, a transmission gear 1003, a fan blade 11, a pinion 12, a blow-off valve 13, a box 14, a link plate conveyor 15, a crushing roller 16, a turning hopper 17, a buffer hopper 18, a first gas pipe 19, a second gas pipe 20, a gas pipe 21, a vertical mill 22, a digestion bin 23, a discharger 24, a hopper 25, a quantitative feeder 26, a main shaft 27, a first bearing beam 28, a first fan blade 29, a first bevel gear 30, a counter shaft 31, a second bevel gear 32, an annular groove 33, a blocking structure 34, a base 3401, an air vent 2, a large shaft groove 3403, a small shaft groove 3404, a spring 5, a third bevel gear 35, a fourth bevel gear 36, a second bearing beam 37, a second bevel blade 39, and a second bearing beam 39 are shown.
Detailed Description
In order to clearly understand the technical scheme of the application, the hot air energy storage unit and the molten steel slag waste heat recovery and utilization system provided by the application are described in detail below by combining specific embodiments with the attached drawings.
The terminology used in the following examples is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification and claims of the present application, the singular forms "a," "an," "the," and "the" are intended to include, for example, "one or more" such forms of expression, unless the context clearly indicates to the contrary. It should also be understood that in the following embodiments of the present application, "at least one", "one or more" means one, two or more than two.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in various places throughout this specification are not necessarily all referring to the same embodiment, but mean "one or more, but not all, embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
Example 1
The embodiment provides a hot air energy storage unit, referring to fig. 1, a schematic diagram of a display structure of the hot air energy storage unit is shown, and as can be seen from the figure, the hot air energy storage unit comprises a pipeline, the pipeline is divided into a main pipeline 1 and a branch pipeline 2, an inlet end and an outlet end are formed on the main pipeline 1, the inlet end of the main pipeline 1 is used for being connected with heat generating equipment (for example, the heat generating equipment can be a steel slag rolling crushing device or a hot stuffy pit), two branch pipelines 2 are connected on the outlet end of the main pipeline 1, and a stop valve 3 (the stop valve 3 can be an electric valve or a manual butterfly valve which can be purchased in the market and is not described herein); the free end of the branch pipe 2 is connected with a phase change structure, and the specific structure of the phase change structure is as follows.
Referring to fig. 2, a schematic view of a split-type phase-change structure is shown, it can be seen from the figure that the phase-change structure comprises a phase-change bin body 4, and in combination with fig. 3 (fig. 3 is a schematic view of a frying structure of the phase-change bin body 4), it can be seen from fig. 2-3 that the phase-change bin body 4 is composed of a main bin 401, a buffer bin 402 and a base 403, an opening is formed at the bottom of the main bin 401, the base 403 is connected to the opening by bolts, and a through hole 5 is formed at the top of the main bin 401; the top of the main bin 401 is connected with a cache bin 402, the cache bin 402 and the main bin 401 are communicated through a through hole 5, and the top of the cache bin 402 is provided with an air outlet hole 6; the air outlet hole 6 is connected with an air outlet nozzle 7, and the air outlet nozzle 7 is used for being connected with heat receiving equipment (for example, the heat receiving equipment can be a drying digestion device or a vertical mill equipment 22); the shape of the buffer bin 402 may be specifically configured as a tapered structure so as to accelerate the outflow rate of the gas; an air inlet nozzle 8 is arranged on the main bin 401, and the air inlet nozzle 8 is connected with the free end of the branch pipeline 2; a phase change member 9 is provided in the main chamber 401, and the phase change member 9 has the following more specific structure.
The phase change member 9 comprises a power shaft 901, one end of the power shaft 901 is in rotary connection with a top through hole 5 of the main bin 401, the other end of the power shaft 901 is in rotary connection with the center of the base 403, a cavity is formed in the power shaft 901, a diversion hole 902 is formed in the power shaft 901, and the diversion hole 902 is communicated with the cavity of the power shaft 901, the main bin 401 and the cache bin 402; the side wall of the power shaft 901 is annularly provided with 6 support shafts 903, and the single support shaft 903 is connected with a phase change material placing shaft 904; in order to provide more phase change material on the phase change material placement shaft 904, the length of the phase change material placement shaft 904 may be extended, and referring to fig. 4, a schematic perspective view of the phase change material placement shaft 904 after deformation is shown, where it can be seen that the phase change material placement shaft 904 is bent and extended in a serpentine arrangement. The phase change material placement shaft 904 is provided with a phase change material, which is not shown in the figure, and the phase change material is placed on the phase change material placement shaft 904 in a manner that the phase change material can be directly filled or poured into a cavity of the phase change material placement shaft 904, which is not shown in the figure. The phase change material of the present application may be directly an aqueous solution (the aqueous solution is usually filled in the cavity of the phase change material placement shaft 904 when the aqueous solution is used as the phase change material), or may be a stearic acid-acetamide/expanded graphite composite phase change material; the raw materials and the preparation method of the stearic acid-acetamide/expanded graphite composite phase change material are as follows.
The stearic acid-acetamide/expanded graphite composite phase change material comprises the following raw materials: stearic acid-acetamide, expanded graphite, table 1 shows DSC test results of stearic acid-acetamide/expanded graphite composite phase change materials, as follows:
as can be seen from table 1, when the addition amount of the expanded graphite is higher than 16%, part of the expanded graphite is not adsorbed to the phase change material, resulting in a larger difference between the phase change latent heat value and the theoretical value of the phase change material, thereby indicating that the addition ratio of the expanded graphite is not as high as possible; in order to ensure the heat storage capacity of the phase change material, the proportion of the expanded graphite contained in the composite phase change material is measured according to experimental data and cannot be higher than 16%.
The preparation method of the stearic acid-acetamide/expanded graphite composite phase-change material comprises the following steps: firstly, 84% by weight of stearic acid-acetamide eutectic phase change material and 16% by weight of expanded graphite are weighed, placed in a beaker, and mixed by centrifugal force of a vortex mixer (model: fw 908); and then vibrating for 50s under the maximum power of a vortex mixer, placing the mixture into a constant-temperature water bath, and standing and heating for 4h at the temperature of 80 ℃ to obtain the stearic acid-acetamide/expanded graphite composite phase-change material.
The use principle of the stearic acid-acetamide/expanded graphite composite phase-change material is as follows: when a fluid medium (such as gas) flows through the phase change material, the temperature is higher than that of the phase change material, the phase change occurs, and heat is absorbed, particularly the phase change material is changed from solid state to liquid state; when a fluid medium (e.g., a gas, etc.) flows through the phase change material, the temperature is lower than the phase change material, and the phase change occurs and gives off heat, specifically the phase change material changes from a liquid state to a solid state.
A blowing nozzle 905 is connected to the main cabin 401, and referring to fig. 5, a schematic connection diagram of the blowing nozzle 905 and a blower 906 is shown, and it can be seen from the figure that an air duct is connected to the blowing nozzle 905, and the other end of the air duct is connected to the blower 906 (the existing product can be purchased in the market). And (3) injection: in actual operation, the temperature of the external natural wind is generally lower than the temperature of the phase change material, but a condenser is still arranged at the air outlet end of the blower 906 (using the existing products in the market), and when a special condition that the temperature of the external natural wind is higher than the temperature of the phase change material occurs, the condenser is started to cool the external natural wind.
When the fluid medium flows through the phase change material on the phase change material placing shaft 904, the phase change material placing shaft 904 and the phase change material are always in a static state, so that insufficient contact between the fluid medium and the phase change material can be caused, and the phase change efficiency of the phase change material is reduced; for this purpose, the phase change structure is optimized, and the specific scheme is as follows.
Referring to fig. 6 in combination with fig. 2, fig. 6 shows an assembly structure of a rotating member 10 and a phase change member 9, and as can be seen from the two diagrams, the rotating member 10 includes an annular fluted disc 1001, the annular fluted disc 1001 is movably sleeved on the upper portion of a power shaft 901, and the power shaft 901 and the center of the annular fluted disc 1001 are located at the same axis; the surface of the annular fluted disc 1001 is connected with a positioning column 1002, and the other end of the positioning column 1002 is fixed with the top of the main bin 401; the phase change material placing shaft 904 is rotatably connected with the fulcrum 903 through a turntable bearing (in the prior art, which is not described herein), the top of the phase change material placing shaft 904 is concentrically connected with a transmission gear 1003, and the transmission gear 1003 is meshed with the annular fluted disc 1001 to form linkage; a power source is connected to the power shaft 901, and the power source can drive the power shaft 901 to rotate. The following embodiments may be employed as the power source.
Specifically, the power source is a fan blade 11, the fan blade 11 is connected to the lower part of the power shaft 901, and the center of the fan blade 11 is concentric with the axis of the power shaft 901. The working principle of the power source is as follows: by means of the fluidity of the fluid medium, when the fluid medium flows into the main bin 401, the fluid medium is in continuous contact with the fan blades 11 in the flowing process, so that the fan blades 11 rotate under the pushing action of the fluid medium, and finally, the power shaft 901 is indirectly driven to rotate.
The rotating member 10 operates on the principle that: firstly, under the action of a power source, the fan blades 11 and the power shaft 901 rotate, and the rotating power shaft 901 drives 6 support shafts 903 and corresponding phase change material placing shafts 904 to rotate (namely, the phase change material placing shafts 904 revolve around the power shaft 901); then, due to the meshing connection between the transmission gear 1003 and the ring gear 1001, the phase change material placement shaft 904 also rotates (i.e., rotates) on the support shaft 903 when the revolution occurs. When the phase change material placement shaft 904 revolves and rotates synchronously, the phase change material in the single phase change material placement shaft 904 can be fully contacted with the fluid medium, so that the phase change efficiency of the phase change material is improved.
As a further optimization of the hot air energy storage unit, referring to fig. 7, there is shown a schematic installation structure of the pinion 12 and the corresponding phase change material placement shaft 904, and as can be seen from the figure, another phase change material placement shaft 904 is additionally connected to the single support shaft 903, the top of the phase change material placement shaft 904 is concentrically provided with the pinion 12, and the pinion 12 is meshed with the transmission gear 1003 and forms a linkage. By providing a plurality of phase change material placement shafts 904 on a single fulcrum 903 at the same time, the amount of phase change material is indirectly increased, so that more heat can be stored.
As a further optimization of the hot air energy storage unit, referring to fig. 2 and 3, a blow-off valve 13 (using the conventional technology in the market, such as model number: DN 25) is provided on the main cabin 401, the blow-off valve 13 is connected to the controller, and an air pressure threshold is set in the controller, and when the air pressure in the main cabin 401 is greater than the air pressure threshold, the blow-off valve 13 is automatically opened, and otherwise closed.
The whole working principle of the hot air energy storage unit is as follows: first case: with continued reference to fig. 1, as shown in the drawing, first, the heat generating device (such as a steel slag rolling and crushing device) continuously generates fluid medium (such as gas, etc.), the stop valve 3 is kept in an open state, and the fluid medium flows through the main pipeline 1, then flows along the edges a1 and a2 respectively into the two branch pipelines 2, and then flows through the air inlet nozzle 8 to enter the main bin 401. Then, the fluid medium in the main bin 401 flows through the diversion hole 902 to enter the cavity of the power shaft 901, and flows through the buffer bin 402 to flow out of the air outlet nozzle 7, so that heat is supplied to the heat receiving device; meanwhile, when the fluid medium flows in the main bin 401, the fluid medium contacts with the phase change material, when the high-temperature fluid medium flows through the phase change material, the phase change material changes phase and absorbs heat to the high-temperature fluid medium, and the phase change material stores the heat; the rotating member 10 rotates under the action of the power source, and the rotating member 10 further indirectly drives the phase change material to revolve and rotate.
Second case: during maintenance, the heat generating device is stopped, and the heat stored in the phase change material is temporarily used; referring to fig. 1, firstly, the stop valve 3 is closed, the blower 906 is started, the blower 906 blows external natural wind into the two main bins 401 along the edges b1 and b2, the natural wind contacts with the phase change material, the phase change material is subjected to phase change and releases heat, and after the temperature of the natural wind is increased, the heat is continuously supplied to heat receiving equipment of the next process.
The application can temporarily store the heat generated in the heat generating equipment by combining the phase change structure, so as to avoid the problem that the heat loss is caused when the molten steel slag is subjected to the hot disintegrating treatment or crushing treatment; the application can timely release the heat in the phase change material when needed by further combining with the blower 906 and other devices.
Example 2
The embodiment provides a molten steel slag waste heat recovery and utilization system, referring to fig. 8, an overall structure schematic diagram of the molten steel slag waste heat recovery and utilization system is shown, and as can be seen from the figure, the molten steel slag waste heat recovery and utilization system comprises a hot air energy storage unit, a steel slag rolling and crushing device is arranged on the left side of a main pipeline 1 of the hot air energy storage unit, and the concrete structure of the steel slag rolling and crushing device is as follows.
Referring to fig. 9, there is shown a schematic structural diagram of a steel slag rolling and crushing device, and as can be seen from the figure, the steel slag rolling and crushing device comprises a box 14, a chain plate conveyor 15 (using existing products, model: 304) and a crushing roller 16 (using existing products, model: 250×400) are arranged in the box 14, and the crushing roller 16 is arranged on the upper left side of the chain plate conveyor 15; a turning hopper 17 is arranged above the crushing roller 16, and the turning hopper 17 is connected to the box body 14 through a connecting shaft; a driving motor (not shown in the figure) is arranged on the box 14, and an output shaft of the driving motor is connected with the connecting shaft; a buffer hopper 18 is arranged below the box body 14, and the right side of the chain plate conveyor 15 extends to the upper side of the buffer hopper 18; the box body 14 is provided with a gas transmission hole which is connected with the main pipeline 1.
The working flow of the steel slag rolling and crushing device is as follows: firstly, pouring molten steel slag in a ladle into a turning hopper 17 by using a travelling crane, and rotating the turning hopper 17 by using a driving motor until the molten steel slag is poured into a crushing roller 16 for rolling and crushing treatment; then, the molten steel slag is discharged from the crushing roller 16 to the link plate conveyor 15 after being crushed, and the link plate conveyor 15 carries the crushed molten steel slag into the buffer hopper 18; meanwhile, hot gas generated in the crushing process of the molten steel slag flows through the gas transmission holes and enters the main pipeline 1; on the other hand, the molten steel slag is cooled by circulating air in the rolling and crushing process, and the molten steel slag is crushed and cooled to obtain a hot material.
With continued reference to fig. 8, a drying digestion device and a vertical mill device 22 are respectively arranged on the right side of the hot air energy storage unit, a first gas transmission pipeline 19 and a second gas transmission pipeline 20 are respectively connected to the gas outlet nozzle 7 of the two-phase change structure, the free ends of the first gas transmission pipeline 19 and the second gas transmission pipeline 20 are connected to the pipe body of the gas distribution pipeline 21, and the two gas outlet ends of the gas distribution pipeline 21 are respectively connected to the drying digestion device and the vertical mill device 22. By means of the connection and arrangement modes of the first gas transmission pipeline 19, the second gas transmission pipeline 20 and the gas distribution pipeline 21, a single hot air energy storage unit can be ensured to provide heat for the drying digestion device and the vertical mill equipment 22.
The vertical mill 22 is a commercially available product, such as a vertical mill of HLM series, and will not be described in detail herein.
Referring to fig. 10, a schematic three-dimensional structure of a drying digestion device is shown, it can be seen from the figure that the drying digestion device comprises a digestion bin 23, a feed inlet is formed at the top of the digestion bin 23, a discharger 24 (for example, a discharge valve in the market is directly used, model: YJD 10) is installed at the bottom of the digestion bin 23, a hopper 25 is installed below the discharger 24, the discharger 24 can seal the bottom of the digestion bin 23, and when the discharger 24 discharges, materials in the digestion bin 23 can be temporarily discharged into the hopper 25 below, and a quantitative feeder 26 (for example, model: GZV 2) is installed at the bottom of the hopper 25. The hot state material obtained by the steel slag rolling and crushing device and the wet state material obtained by the hot disintegrating treatment are added into the digestion bin 23, and the hot state material and the wet state material are mixed and contacted, so that the water content in the wet state material is reduced.
In the long-time use process of the molten steel slag waste heat recovery and utilization system, as a great amount of dust is inevitably contained in hot gas, the dust is continuously accumulated on the inner wall of the main pipeline 1 or the branch pipeline 2, and the inner cavity of the main pipeline 1 or the branch pipeline 2 is narrowed along with the increase of the dust; when the hot gas passes through the narrowing part of the main pipeline 1 or the branch pipeline 2, the air pressure at the narrowing part can be increased, and finally the main pipeline 1 or the branch pipeline 2 can be blasted; for this purpose, referring to fig. 8, the present application further designs an explosion-proof unit, which is installed at the junction of the main pipe 1 and the branch pipe 2, and has the following specific structure.
Referring to fig. 11, which is a partially enlarged view of a portion of fig. 8, it can be seen that the explosion-proof unit includes a main shaft 27, a first spandrel girder 28 is connected to a left end portion of the main shaft 27, the first spandrel girder 28 is connected to an inner wall of the main pipe 1 (note: the first spandrel girder 28 does not affect the passage of hot gas through the main pipe 1), a first fan 29 is installed on the main shaft 27, a first bevel gear 30 is installed on a right end portion of the main shaft 27, and a center of the first bevel gear 30 is concentric with the main shaft 27; a countershaft 31 is arranged at the upper right of the first conical gear 30, the top end of the countershaft 31 passes through the joint of the main pipeline 1 and the branch pipeline 2 to form rotary connection with the top of the branch pipeline 2 above, a second conical gear 32 is concentrically arranged at the bottom end of the countershaft 31, and the first conical gear 30 is meshed with the second conical gear 32 to form linkage; an annular groove 33 (refer to the schematic view of the annular groove 33 shown in fig. 13) is formed in the middle of the shaft body of the auxiliary shaft 31, and a blocking structure 34 is arranged on the annular groove 33; specifically, referring to the perspective cut-away view of the blocking structure 34 shown in fig. 14, it can be seen from the figure that the bottom of the blocking structure 34 is formed with a seat 3401 having an i-shaped cross section; a gap of about 1mm is formed at the pipe wall at the joint of the upper and lower edges of the base 3401 of the blocking structure 34 with the main pipe 1 and the branch pipe 2 (in actual use, trace hot gas still passes through the gap), and 4 ventilation holes 3402 are formed on the edge of the bottom side of the base 3401 of the blocking structure 34 in an annular array manner; the axial direction of the through blocking structure 34 is provided with a circular shaft groove, the shaft groove is composed of a large shaft groove 3403 and a small shaft groove 3404, and the bottom of the large shaft groove 3403 is in butt joint with the top of the small shaft groove 3404 and is communicated with the top of the small shaft groove 3404; referring to fig. 11, the small shaft groove 3404 of the blocking structure 34 forms a sliding fit with the annular groove 33, and the large shaft groove 3403 of the blocking structure 34 forms a rotational connection with the auxiliary shaft 31 above the annular groove 33; an elastic member (e.g., a spring 3405, etc.) is connected to the annular groove 33, and the other end of the elastic member is connected to the blocking structure 34.
As a further optimization of the explosion-proof unit, with continued reference to fig. 11, the top of the blocking structure 34 is formed with a third conical gear 35, a fourth conical gear 36 is arranged on the right side of the third conical gear 35, the third conical gear 35 and the fourth conical gear 36 can form a vertical gear set and are linked, and the fourth conical gear 36 is concentrically connected to the auxiliary shaft 37; when the elastic member is in a natural state, the third bevel gear 35 and the fourth bevel gear 36 are in a separated state; the other end of the auxiliary shaft 37 is connected to a second spandrel girder 38 (note: the second spandrel girder 38 does not affect the passage of hot gas through the branch pipe 2), and a second fan 39 is connected to the auxiliary shaft 37.
A manhole 40 is arranged at the bottom of the main pipeline 1, so that the staff can conveniently enter and remove dust.
The working principle of the explosion-proof unit is as follows: in the first case, see fig. 11, the amount of dust deposited in the main duct 1 is small, and the gas pressure in the main duct 1 is much smaller than the elastic force of the elastic member, so that the blocking structure 34 does not move upward; at this time, after the hot gas flows through the main pipe 1, it can only enter one branch pipe 2 along c 1.
In the second case, referring to fig. 12, which shows a schematic view of the usage structure of the explosion-proof unit, it can be seen from the figure that the amount of dust deposited in the main pipe 1 is large, and the gas pressure in the main pipe 1 is much greater than the elastic force of the elastic member, so that the hot gas will jack up the blocking structure 34 up until the upper edge of the base 3401 of the blocking structure 34 is out of contact with the main pipe 1 and the branch pipe 2; wherein a small amount of hot gas still enters the narrower branch pipeline 2 along the c1, and a large amount of hot gas sequentially passes through the air holes 3402 and the gaps in the middle of the seat 3401 and finally enters the other branch pipeline 2 along the c2, so that the strong pressure generated by the hot gas instantaneously is relieved, and the risk of blasting of the main pipeline 1 and the branch pipeline 2 is avoided.
On the other hand, when the blocking structure 34 moves upwards, the third bevel gear 35 also moves upwards synchronously until the third bevel gear 35 contacts with the fourth bevel gear 36 and forms a meshing fit; simultaneously, the first fan blade 29 and the main shaft 27 are driven by hot gas to rotate, so that the first bevel gear 30, the second bevel gear 32, the auxiliary shaft 31, the third bevel gear 35, the fourth bevel gear 36 and the auxiliary shaft 37 are correspondingly rotated in sequence, the auxiliary shaft 37 further drives the second fan blade 39 to rotate, the rotating second fan blade 39 can suck hot gas, high-pressure hot gas in the main pipeline 1 can be rapidly split, and the efficiency of the hot gas entering the other branch pipeline 2 is improved.
Note that: in both cases, the shut-off valve 3 is always in an open state.
Claims (8)
1. A molten steel slag waste heat recovery and utilization system is characterized in that: the hot air energy storage device comprises a hot air energy storage unit, wherein the hot air energy storage unit comprises a pipeline, the pipeline comprises a main pipeline (1) and branch pipelines (2), the inlet end of the main pipeline (1) is used for being connected with a steel slag rolling crushing device, the outlet end of the main pipeline (1) is connected with the two branch pipelines (2), and a stop valve (3) is arranged on the branch pipelines (2); the free end of the branch pipeline (2) is connected with a phase change structure; the two phase-change structure air outlet nozzles (7) are respectively connected with a first air conveying pipeline (19) and a second air conveying pipeline (20), the free ends of the first air conveying pipeline (19) and the second air conveying pipeline (20) are connected to the pipe body of the air distribution pipeline (21), and the two air outlet ends of the air distribution pipeline (21) are respectively connected with a drying digestion device and a vertical mill device (22); the explosion-proof unit is arranged at the joint of the main pipeline (1) and the branch pipeline (2); the explosion-proof unit comprises a main shaft (27), a first spandrel girder (28) is connected to the left end part of the main shaft (27), the first spandrel girder (28) is connected with the inner wall of the main pipeline (1), a first fan blade (29) is arranged on the main shaft (27), a first conical gear (30) is arranged on the right end part of the main shaft (27), and the center of the first conical gear (30) is concentric with the main shaft (27); a secondary shaft (31) is arranged at the upper right of the first conical gear (30), the top end of the secondary shaft (31) penetrates through the joint of the main pipeline (1) and the branch pipeline (2) to form rotary connection with the top of the branch pipeline (2) above, a second conical gear (32) is concentrically arranged at the bottom end of the secondary shaft (31), and the first conical gear (30) is meshed with the second conical gear (32) to form linkage; an annular groove (33) is formed in the middle of the shaft body of the auxiliary shaft (31), and a blocking structure (34) is arranged on the annular groove (33); the bottom of the blocking structure (34) is provided with a seat body (3401) with an I-shaped cross section; the upper edge and the lower edge of the base body (3401) of the blocking structure (34) form a gap with the pipe wall at the joint of the main pipe (1) and the branch pipe (2), and 4 ventilation holes (3402) are formed in the edge of the bottom side of the base body (3401) of the blocking structure (34); the axial direction of the through blocking structure (34) is provided with a circular shaft groove, the shaft groove is composed of a large shaft groove (3403) and a small shaft groove (3404), and the bottom of the large shaft groove (3403) is in butt joint with the top of the small shaft groove (3404) and is communicated with the top of the small shaft groove; the small shaft groove (3404) of the blocking structure (34) is in sliding fit with the annular groove (33), and the large shaft groove (3403) of the blocking structure (34) is in rotary connection with the auxiliary shaft (31) above the annular groove (33); an elastic part is connected in the annular groove (33), and the other end of the elastic part is connected with a blocking structure (34); a third conical gear (35) is formed at the top of the blocking structure (34), a fourth conical gear (36) is arranged on the right side of the third conical gear (35), the third conical gear (35) and the fourth conical gear (36) can form a vertical gear set and are linked, and the fourth conical gear (36) is concentrically connected to the auxiliary shaft (37); when the elastic part is in a natural state, the third bevel gear (35) and the fourth bevel gear (36) are in a separated state; the other end of the auxiliary shaft (37) is connected to a second spandrel girder (38), and the auxiliary shaft (37) is connected with a second fan (39); the gas pressure of the main pipeline (1) is smaller than the elasticity of the elastic part, the blocking structure (34) cannot move upwards, and the hot gas enters one branch pipeline (2) after flowing through the main pipeline (1); the gas pressure in the main pipeline (1) is larger than the elasticity of the elastic component, and the hot gas can jack up the blocking structure (34) upwards until the upper edge of the base body (3401) of the blocking structure (34) is separated from contact with the main pipeline (1) and the branch pipeline (2); the hot gas passes through the air holes (3402) and the gaps in the middle of the seat body (3401) and enters the other branch pipeline (2); when the blocking structure (34) moves upwards, the third bevel gear (35) also moves upwards synchronously until the third bevel gear (35) contacts with the fourth bevel gear (36) and forms a meshing fit; the first fan blade (29) and the main shaft (27) are driven by hot gas to rotate, so that the first bevel gear (30), the second bevel gear (32), the auxiliary shaft (31), the third bevel gear (35), the fourth bevel gear (36) and the auxiliary shaft (37) rotate in sequence, and the auxiliary shaft (37) drives the second fan blade (39) to rotate.
2. The molten steel slag waste heat recovery and utilization system according to claim 1, wherein: the phase change structure comprises a phase change bin body (4), wherein the phase change bin body (4) is respectively provided with an air inlet nozzle (8) and an air outlet nozzle (7), the air inlet nozzle (8) is connected with the free end of the branch pipeline (2), and the air outlet nozzle (7) is used for being connected with a drying digestion device and a vertical mill device (22); a phase change member (9) is arranged in the phase change bin body (4), and a phase change material is arranged on the phase change member (9); the main bin (401) is connected with a blowing nozzle (905), and the blowing nozzle (905) is connected with a blower (906) through an air duct.
3. The molten steel slag waste heat recovery and utilization system according to claim 2, wherein: the phase change bin body (4) comprises a main bin (401), a cache bin (402) and a base (403), the base (403) is arranged at the bottom of the main bin (401), the top of the main bin (401) is connected with the cache bin (402), and the cache bin (402) is connected with an air outlet nozzle (7); the main bin (401) is provided with an air inlet nozzle (8), and the main bin (401) is internally provided with a phase change member (9).
4. The molten steel slag waste heat recovery and utilization system according to claim 3, wherein: the phase change member (9) comprises a power shaft (901), two ends of the power shaft (901) are respectively connected with the top of the main bin (401) and the base (403) in a rotating way, the power shaft (901) is of a cavity structure, the cavity of the power shaft (901) is communicated with the cache bin (402), and a diversion hole (902) is formed in the power shaft (901); at least two support shafts (903) are arranged on the power shaft (901), and a phase change material placing shaft (904) for placing the phase change material is connected to the support shafts (903).
5. The molten steel slag waste heat recovery and utilization system according to claim 4, wherein: the phase change member (9) is provided with a rotating member (10), wherein the rotating member (10) comprises an annular fluted disc (1001), the annular fluted disc (1001) is sleeved on a power shaft (901), and the annular fluted disc (1001) and the power shaft (901) form clearance fit; the annular fluted disc (1001) is fixedly connected to the main bin (401), the phase change material placing shaft (904) is rotationally connected with the fulcrum shaft (903), one end of the phase change material placing shaft (904) is connected with the transmission gear (1003), and the transmission gear (1003) is meshed with the annular fluted disc (1001) to form linkage; the power shaft (901) is connected with a power source for driving the power shaft (901) to rotate.
6. The molten steel slag waste heat recovery and utilization system according to claim 5, wherein: the fulcrum (903) is rotatably connected with another phase change material placing shaft (904), the phase change material placing shaft (904) is connected with a pinion (12), and the pinion (12) is meshed with the transmission gear (1003) to form linkage.
7. The molten steel slag waste heat recovery and utilization system according to claim 1, wherein: the steel slag rolling and crushing device comprises a box body (14), wherein a chain plate conveyor (15) and a crushing roller (16) are arranged in the box body (14), the crushing roller (16) is arranged on the chain plate conveyor (15), and a turning hopper (17) is arranged on the box body (14) above the crushing roller (16); a driving motor is arranged on the box body (14) and is used for driving the turning hopper (17) to turn; a buffer hopper (18) is arranged below the box body (14), and the other end of the chain plate conveyor (15) extends to the upper part of the buffer hopper (18); the box body (14) is provided with a gas transmission hole which is connected with the main pipeline (1).
8. The molten steel slag waste heat recovery and utilization system of claim 7, wherein: the drying digestion device comprises a digestion bin (23), a feed inlet is formed in the top of the digestion bin (23), a discharger (24) is arranged at the bottom of the digestion bin (23), a hopper (25) is arranged below the discharger (24), and a quantitative feeder (26) is arranged at the bottom of the hopper (25).
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| CN103575123A (en) * | 2012-08-03 | 2014-02-12 | 王智慧 | Waste heat recovery, storage and utilization system and method for intermittent spread steam |
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