CN111076536A - External heating type rotary kiln for calcining carbonate minerals, waste heat recovery system and implementation method - Google Patents
External heating type rotary kiln for calcining carbonate minerals, waste heat recovery system and implementation method Download PDFInfo
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- CN111076536A CN111076536A CN201911378619.5A CN201911378619A CN111076536A CN 111076536 A CN111076536 A CN 111076536A CN 201911378619 A CN201911378619 A CN 201911378619A CN 111076536 A CN111076536 A CN 111076536A
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- carbon dioxide
- waste heat
- dust remover
- heat boiler
- rotary kiln
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- 239000002918 waste heat Substances 0.000 title claims abstract description 82
- 238000010438 heat treatment Methods 0.000 title claims abstract description 55
- 238000001354 calcination Methods 0.000 title claims abstract description 22
- 229910001748 carbonate mineral Inorganic materials 0.000 title claims abstract description 21
- 238000011084 recovery Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 12
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 196
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 98
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 98
- 239000000463 material Substances 0.000 claims abstract description 75
- 239000000428 dust Substances 0.000 claims abstract description 61
- 238000001816 cooling Methods 0.000 claims abstract description 35
- 239000002994 raw material Substances 0.000 claims abstract description 23
- 239000007787 solid Substances 0.000 claims abstract description 17
- 238000007599 discharging Methods 0.000 claims abstract description 16
- 239000002912 waste gas Substances 0.000 claims abstract description 14
- 238000002360 preparation method Methods 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 239000000112 cooling gas Substances 0.000 claims abstract description 4
- 238000010248 power generation Methods 0.000 claims abstract description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 7
- 239000000446 fuel Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000003245 coal Substances 0.000 claims description 2
- 239000003034 coal gas Substances 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 230000009970 fire resistant effect Effects 0.000 claims 2
- 230000000694 effects Effects 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 2
- 239000001095 magnesium carbonate Substances 0.000 description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 2
- 235000014380 magnesium carbonate Nutrition 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- -1 rare earth carbonate Chemical class 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/08—Rotary-drum furnaces, i.e. horizontal or slightly inclined externally heated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/2016—Arrangements of preheating devices for the charge
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/22—Rotary drums; Supports therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/34—Arrangements of heating devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/38—Arrangements of cooling devices
-
- 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
- F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
-
- 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
- F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
- F27D15/02—Cooling
-
- 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
- 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
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/006—Systems for reclaiming waste heat using a boiler
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
- Furnace Details (AREA)
Abstract
An external heating rotary kiln for calcining carbonate minerals and a waste heat recovery system and an implementation method thereof are disclosed, raw materials in a raw material bin are fed into the external heating rotary kiln through a feeding device, and are decomposed into oxides and carbon dioxide through a heating chamber, and the oxides and the carbon dioxide are discharged through a discharging device; high-temperature waste gas discharged from the heating chamber is discharged through the material preheating feeder and the waste heat boiler III. Carbon dioxide raw gas discharged from the discharging device sequentially passes through a primary carbon dioxide dust remover, a waste heat boiler, a secondary carbon dioxide dust remover, a tertiary carbon dioxide dust remover and a liquid-solid carbon dioxide preparation system to be prepared into food-grade liquid and solid carbon dioxide products, and discharged high-temperature materials are conveyed to a finished product bin through a material cooling device. The circulating cooling gas completes primary material cooling and waste heat recovery circulation through the material cooling device, the waste heat boiler II and the material cooling device in sequence. And materials discharged by the waste heat boiler, the waste heat boiler II, the secondary carbon dioxide dust remover and the tertiary carbon dioxide dust remover are conveyed to a finished product bin. The waste heat is used for heat supply and power generation.
Description
Technical Field
The invention relates to an external heating rotary kiln for calcining carbonate minerals, a waste heat recovery system and an implementation method, which can be used for calcining carbonate minerals such as limestone, magnesite, dolomite, rare earth carbonate and the like.
Background
Carbonate minerals are compounds in which metal cations are combined with carbonate. The carbonate minerals are widely distributed, and calcium and magnesium carbonate minerals are the most. The metal cations mainly comprise sodium, calcium, magnesium, barium, rare earth elements and the like, and are combined with anionic carbonate by ionic bonds to form three structural types of island, chain and layer, wherein the island structure carbonate is taken as the main structure.
Calcination is the process of thermal dissociation or crystal transformation of natural or man-made compounds; the compound is thermally dissociated into a simpler compound or undergoes a crystal transformation. The calcination can be used for directly treating mineral raw materials to meet the requirements of subsequent processes, and can also be used for preparing chemical concentrate through the post-treatment of chemical ore dressing, so that the requirements of users on products are met.
The prior art for calcining carbonate minerals mainly adopts the technologies of shaft furnaces, rotary kilns, tunnel kilns and the like. The commonly adopted shaft furnace and tunnel kiln technology generally adopts massive ore to be calcined in a furnace, and because the temperature uniformity in the furnace is poor, the particle size of the ore material entering the furnace is large, the site of over-burning or under-burning is easy to appear, and the final calcined product has the defects of uneven quality, low activity and the like; in addition, because the grain diameter of the fed ore is not less than 40mm, ores and powder with smaller grain diameters are usually discarded or treated at low price during mining and ore crushing, so that huge resource waste and environmental protection problems are caused. The main defects of the prior art are that the fuel is in direct contact with the materials, the produced product has more impurities, lower activity and large heat consumption, the produced carbon dioxide is difficult to recycle, the waste gas environmental protection treatment cost is high, and a large amount of solid and gas waste heat generated in the production process can not be effectively utilized.
Disclosure of Invention
In view of the problems in the prior art, the invention provides an external heating type rotary kiln for calcining carbonate minerals, a waste heat recovery system and a realization method thereof, which are used for producing high-quality and high-activity calcined products, simultaneously recovering carbon dioxide generated by calcining and decomposing materials, producing food-grade liquid solid carbon dioxide products and completely recycling waste heat in the production process.
In order to achieve the purpose, the invention adopts the technical scheme that: an external heating type rotary kiln and waste heat recovery system for calcining carbonate minerals is characterized in that: the system comprises a material preheating feeder, a heating chamber, an external heating rotary kiln, a waste heat boiler I, a waste heat boiler II, a waste heat boiler III, a primary carbon dioxide dust remover, a secondary carbon dioxide dust remover, a tertiary carbon dioxide dust remover, a liquid-solid carbon dioxide preparation system, a finished product bin, a material cooling device and a raw material bin;
one end of the external heating rotary kiln is hermetically connected with the feeding device, and the other end of the external heating rotary kiln is hermetically connected with the discharging device;
the material preheating feeder is of a coil pipe structure, a material inlet is connected with the raw material bin through a pipeline, and a material outlet of the material preheating feeder is connected with the feeding device;
the heating chamber is hermetically connected with two ends of a cylinder of the external heating rotary kiln through sealing, a waste gas outlet arranged at the upper part of the heating chamber is connected with a waste heat boiler III through a waste gas pipeline and a material preheating feeder coil pipe, and a discharge hole at the lower part of the heating chamber is connected with a material cooling device;
the primary carbon dioxide dust remover adopts a cyclone structure, an air outlet at the upper part of the primary carbon dioxide dust remover is connected with a pipeline of a waste heat boiler I, an air outlet of the waste heat boiler I is connected with a pipeline of a secondary carbon dioxide dust remover, an air outlet of the secondary carbon dioxide dust remover is connected with a pipeline of a tertiary carbon dioxide dust remover, and an outlet of the tertiary carbon dioxide dust remover is connected with a liquid-solid carbon dioxide preparation system;
the air inlet and the air outlet of the material cooling device are respectively connected with the air outlet and the air inlet of the waste heat boiler II; and the lower discharge ports of the material cooling device, the waste heat boiler I, the waste heat boiler II, the primary carbon dioxide dust remover, the secondary carbon dioxide dust remover and the tertiary carbon dioxide dust remover are connected with a finished product bin.
An implementation method of an external heating type rotary kiln and a waste heat recovery system for calcining carbonate minerals is characterized by comprising the following steps:
firstly, raw materials in a raw material bin are fed into an external heating type rotary kiln through a feeding device, and after the raw materials are heated and calcined by a heating chamber, carbonate in the raw materials is decomposed into oxides and carbon dioxide which are discharged through a discharging device;
secondly, high-temperature waste gas discharged from the heating chamber sequentially enters a material preheating feeder and a waste heat boiler III to be cooled and then is discharged;
thirdly, pre-dedusting the carbon dioxide feed gas discharged from the upper part of the discharging device by a first-stage carbon dioxide dust remover, cooling the carbon dioxide feed gas in a waste heat boiler I, sequentially feeding the carbon dioxide feed gas into a second-stage carbon dioxide dust remover and a third-stage carbon dioxide dust remover, wherein the dust content of carbon dioxide at the outlet of the third-stage carbon dioxide dust remover is less than 1mg/Nm3Sending into a liquid-solid carbon dioxide preparation system to prepare food-grade liquid and solid carbon dioxide products;
fourthly, high-temperature materials discharged from the lower part of the discharging device enter a material cooling device, and the cooled materials are conveyed to a finished product bin;
fifth, circulating cooling gas enters from the lower part of the material cooling device, exchanges heat with high-temperature materials, is discharged from the upper part of the material cooling device, enters the waste heat boiler II for cooling, and then is sent back to the lower part of the material cooling device, and primary material cooling and waste heat recovery circulation is completed;
and sixthly, all the materials discharged from the lower parts of the waste heat boiler I, the waste heat boiler II, the secondary carbon dioxide dust remover and the tertiary carbon dioxide dust remover are conveyed to a finished product bin.
The invention has the technical effects that: the carbonate minerals are calcined and decomposed by adopting an external heating type rotary kiln, the application range of raw materials and fuels is wide, and tailings or raw materials with lower quality can be fully utilized to produce high-quality and high-activity calcined products; the carbon dioxide generated by decomposing the carbonate can be recovered to produce food-grade liquid solid carbon dioxide; the power consumption and the heat consumption in production are reduced, and the economic and social benefits are good.
The invention adopts a medium-temperature and medium-pressure natural circulation waste heat boiler to recover waste gas and produce steam by using waste heat of materials for heat supply and power generation.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the external heating type rotary kiln and the waste heat recovery system for calcining carbonate minerals comprise a material preheating feeder 1, a heating chamber 2, an external heating type rotary kiln 3, a waste heat boiler i4, a waste heat boiler ii 5, a waste heat boiler iii 6, a primary carbon dioxide dust remover 7, a secondary carbon dioxide dust remover 8, a tertiary carbon dioxide dust remover 9, a liquid-solid carbon dioxide preparation system 10, a finished product bin 11, a material cooling device 12 and a raw material bin 13.
One end of the external heating type rotary kiln 3 is hermetically connected with a feeding device 3-1, and the other end is hermetically connected with a discharging device 3-2.
The material preheating feeder 1 adopts a coil pipe structure, a material inlet is connected with the raw material bin 13 through a pipeline, and a material outlet of the material preheating feeder 1 is connected with the feeding device 3-1; the heating chamber 2 is hermetically connected with two ends of a cylinder of the external heating type rotary kiln 3 through sealing, a waste gas outlet arranged at the upper part of the heating chamber 2 is connected with a waste heat boiler III 6 through a waste gas pipeline by a coil pipe of the material preheating feeder 1, an air outlet at the upper part of the discharging device 3-2 is connected with an air inlet pipeline of a primary carbon dioxide dust remover 7, and a discharging port at the lower part is connected with a material cooling device 12; the primary carbon dioxide dust remover 7 adopts a cyclone structure, an air outlet at the upper part of the primary carbon dioxide dust remover 7 is connected with a pipeline of a waste heat boiler I4, an air outlet of the waste heat boiler I4 is connected with a pipeline of a secondary carbon dioxide dust remover 8, an air outlet of the secondary carbon dioxide dust remover 8 is connected with a pipeline of a tertiary carbon dioxide dust remover 9, and an outlet of the tertiary carbon dioxide dust remover 9 is connected with a liquid-solid carbon dioxide preparation system 10; the air inlet and the air outlet of the material cooling device 12 are respectively connected with the air outlet and the air inlet of the waste heat boiler II 5; and the lower discharge ports of the material cooling device 12, the waste heat boiler I4, the waste heat boiler II 5, the primary carbon dioxide dust remover 7, the secondary carbon dioxide dust remover 8 and the tertiary carbon dioxide dust remover 9 are connected with a finished product bin 11.
The second-stage carbon dioxide dust remover 8 and the third-stage carbon dioxide dust remover 9 adopt low-flow-rate cloth bag dust removers.
The heating chamber 2 is composed of a metal shell, an inner heat preservation layer and a fireproof layer, wherein the inner heat preservation layer is made of a nanometer heat preservation material, the thickness of the nanometer heat preservation layer is 50-100mm, and the thickness of the fireproof layer is 100-200 mm.
The cylinder body of the external heating type rotary kiln 3 is formed by welding heat-resistant steel, and the horizontal inclination angle is 1-3 degrees.
An external heating type rotary kiln for calcining carbonate minerals and a waste heat recovery system and an implementation method thereof comprise the following steps:
firstly, feeding raw materials with the diameter less than 5mm in a raw material bin 13 into an external heating type rotary kiln 3 through a feeding device 3-1, heating and calcining the raw materials in a heating chamber 2, and decomposing carbonate in the raw materials into oxides and carbon dioxide to be discharged through a discharging device 3-2;
and secondly, high-temperature waste gas discharged from the heating chamber 2 sequentially enters the material preheating feeder 1 and the waste heat boiler III 6 to be cooled and then discharged.
Thirdly, the carbon dioxide raw gas discharged from the upper part of the discharging device 3-2 is pre-dedusted by a first-stage carbon dioxide deduster 7, enters a waste heat boiler I4 for cooling, and then sequentially enters a second-stage carbon dioxide deduster 8 and a third-stage carbon dioxide deduster 9, wherein the dust content of carbon dioxide at the outlet of the third-stage carbon dioxide deduster 9 is less than 1mg/Nm3And then sent to a liquid-solid carbon dioxide preparation system 10 to be prepared into food-grade liquid and solid carbon dioxide products.
Fourthly, the high-temperature material discharged from the lower part of the discharging device 3-2 enters a material cooling device 12, and the cooled material is sent to a finished product bin 11.
And fifthly, circulating cooling gas enters from the lower part of the material cooling device 12, exchanges heat with high-temperature materials, is discharged from the upper part of the material cooling device 12, enters the waste heat boiler II 5, is cooled, and is then returned to the lower part of the material cooling device 12, so that primary material cooling and waste heat recovery circulation is completed.
Sixthly, all materials discharged from the lower parts of the waste heat boiler I4, the waste heat boiler II 5, the secondary carbon dioxide dust remover 8 and the tertiary carbon dioxide dust remover 9 are conveyed to the finished product bin 11.
The heating chamber 2 adopts any one of coal, coal gas, high-temperature gas and electric energy as a heat source to uniformly heat the external heating type rotary kiln 3, and the unit low-level heating value of the used fuel is 1200-3000 kcal.
The waste heat boiler I4, the waste heat boiler II 5 and the waste heat boiler III 6 adopt medium-temperature medium-pressure natural circulation waste heat boilers to recover waste gas and waste heat of materials, and steam is produced for heat supply and power generation.
Claims (7)
1. An external heating type rotary kiln and waste heat recovery system for calcining carbonate minerals is characterized in that: the device comprises a material preheating feeder (1), a heating chamber (2), an external heating type rotary kiln (3), a waste heat boiler I (4), a waste heat boiler II (5), a waste heat boiler III (6), a primary carbon dioxide dust remover (7), a secondary carbon dioxide dust remover (8), a tertiary carbon dioxide dust remover (9), a liquid-solid carbon dioxide preparation system (10), a finished product bin (11), a material cooling device (12) and a raw material bin (13);
one end of the external heating type rotary kiln (3) is hermetically connected with a feeding device (3-1), and the other end of the external heating type rotary kiln is hermetically connected with a discharging device (3-2);
the material preheating feeder (1) adopts a coil pipe structure, a material inlet is connected with the raw material bin (13) through a pipeline, and a material outlet of the material preheating feeder (1) is connected with the feeding device (3-1);
the heating chamber (2) is hermetically connected with two ends of a cylinder of the external heating type rotary kiln (3) through sealing, a waste gas outlet arranged at the upper part of the heating chamber (2) is connected with a waste heat boiler III (6) through a waste gas pipeline by a coil pipe of the material preheating feeder (1), and a discharge hole at the lower part is connected with a material cooling device (12);
the primary carbon dioxide dust remover (7) adopts a cyclone structure, an air outlet at the upper part of the primary carbon dioxide dust remover (7) is connected with a waste heat boiler I (4) through a pipeline, an air outlet of the waste heat boiler I (4) is connected with a secondary carbon dioxide dust remover (8) through a pipeline, an air outlet of the secondary carbon dioxide dust remover (8) is connected with a tertiary carbon dioxide dust remover (9) through a pipeline, and an outlet of the tertiary carbon dioxide dust remover (9) is connected with a liquid-solid carbon dioxide preparation system (10);
the air inlet and the air outlet of the material cooling device (12) are respectively connected with the air outlet and the air inlet of the waste heat boiler II (5); the lower discharge ports of the material cooling device (12), the waste heat boiler I (4), the waste heat boiler II (5), the primary carbon dioxide dust remover (7), the secondary carbon dioxide dust remover (8) and the tertiary carbon dioxide dust remover (9) are connected with the finished product bin (11).
2. The externally heated rotary kiln and waste heat recovery system for calcining carbonate minerals according to claim 1 wherein: the second-stage carbon dioxide dust remover (8) and the third-stage carbon dioxide dust remover (9) adopt low-flow-rate bag-type dust removers.
3. The externally heated rotary kiln and waste heat recovery system for calcining carbonate minerals according to claim 1 wherein: the heating chamber (2) is composed of a metal shell, an inner heat preservation layer and a fire-resistant layer, wherein the inner heat preservation layer is made of a nanometer heat preservation material and has a thickness of 50-100mm, and the fire-resistant layer has a thickness of 100-200 mm.
4. The externally heated rotary kiln and waste heat recovery system for calcining carbonate minerals according to claim 1 wherein: the cylinder body of the external heating type rotary kiln (3) is formed by welding heat-resistant steel, and the horizontal inclination angle is 1-3 degrees.
5. A method for implementing an external thermal rotary kiln and a waste heat recovery system for calcining carbonate minerals according to claim 1, comprising the steps of:
firstly, raw materials in a raw material bin (13) are fed into an external heating type rotary kiln (3) through a feeding device (3-1), and after the raw materials are heated and calcined by a heating chamber (2), carbonate in the raw materials is decomposed into oxides and carbon dioxide which are discharged through a discharging device (3-2);
secondly, high-temperature waste gas discharged from the heating chamber (2) sequentially enters the material preheating feeder (1) and the waste heat boiler III (6) to be cooled and then is discharged;
thirdly, the carbon dioxide raw gas discharged from the upper part of the discharging device (3-2) is pre-dedusted by a first-stage carbon dioxide deduster (7), enters a waste heat boiler I (4) for cooling, and then sequentially enters a second-stage carbon dioxide deduster (8) and a third-stage carbon dioxide deduster (9), wherein the dust content of carbon dioxide at the outlet of the third-stage carbon dioxide deduster (9) is less than 1mg/Nm3Sending the carbon dioxide into a liquid-solid carbon dioxide preparation system (10) to prepare food-grade liquid and solid carbon dioxide products;
fourthly, high-temperature materials discharged from the lower part of the discharging device (3-2) enter a material cooling device (12), and the cooled materials are conveyed to a finished product bin (11);
fifth, circulating cooling gas enters from the lower part of the material cooling device (12), exchanges heat with high-temperature materials, is discharged from the upper part of the material cooling device (12), enters the waste heat boiler II (5), is cooled, and then is sent back to the lower part of the material cooling device (12), and primary material cooling and waste heat recovery circulation is completed;
and sixthly, all the materials discharged from the lower parts of the waste heat boiler I (4), the waste heat boiler II (5), the secondary carbon dioxide dust remover (8) and the tertiary carbon dioxide dust remover (9) are conveyed to a finished product bin (11).
6. The method for implementing an external thermal rotary kiln and waste heat recovery system for the calcination of carbonate minerals according to claim 5, wherein: the heating chamber (2) adopts any one of coal, coal gas, high-temperature gas and electric energy as a heat source to uniformly heat the external-heating rotary kiln (3), and the unit low-level heating value of the used fuel is 1200-3000 kcal.
7. The method for implementing an external thermal rotary kiln and waste heat recovery system for the calcination of carbonate minerals according to claim 5, wherein: the waste heat boiler I (4), the waste heat boiler II (5) and the waste heat boiler III (6) adopt a medium-temperature medium-pressure natural circulation waste heat boiler to recover waste gas and waste heat of materials, and steam is produced for heat supply and power generation.
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| CN114136114A (en) * | 2021-11-12 | 2022-03-04 | 上海置信能源综合服务有限公司 | Low-carbon-dioxide-emission external-heating calcining kiln combustion heating system |
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