CN111977995A - Powder lime calcining and reforming system based on novel dry-process cement clinker calcining system - Google Patents
Powder lime calcining and reforming system based on novel dry-process cement clinker calcining system Download PDFInfo
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- 238000001354 calcination Methods 0.000 title claims abstract description 119
- 235000008733 Citrus aurantifolia Nutrition 0.000 title claims abstract description 75
- 235000011941 Tilia x europaea Nutrition 0.000 title claims abstract description 75
- 239000004571 lime Substances 0.000 title claims abstract description 75
- 239000000843 powder Substances 0.000 title claims abstract description 53
- 239000004568 cement Substances 0.000 title claims abstract description 38
- 238000001035 drying Methods 0.000 title claims abstract description 24
- 238000002407 reforming Methods 0.000 title abstract description 11
- 239000000725 suspension Substances 0.000 claims abstract description 179
- 238000001816 cooling Methods 0.000 claims abstract description 24
- 238000002485 combustion reaction Methods 0.000 claims description 37
- 239000002912 waste gas Substances 0.000 claims description 32
- 235000019738 Limestone Nutrition 0.000 claims description 29
- 239000006028 limestone Substances 0.000 claims description 29
- 239000002994 raw material Substances 0.000 claims description 18
- 239000000446 fuel Substances 0.000 claims description 17
- 238000011084 recovery Methods 0.000 claims description 16
- 239000002918 waste heat Substances 0.000 claims description 15
- 239000000428 dust Substances 0.000 claims description 13
- 238000010304 firing Methods 0.000 claims description 10
- 238000000227 grinding Methods 0.000 claims description 10
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- 239000000779 smoke Substances 0.000 claims description 8
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- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 6
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- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 6
- 239000011425 bamboo Substances 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 5
- 239000003546 flue gas Substances 0.000 claims description 5
- 239000003245 coal Substances 0.000 claims description 4
- 239000000295 fuel oil Substances 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- 238000012986 modification Methods 0.000 claims description 4
- 239000003345 natural gas Substances 0.000 claims description 4
- 238000005453 pelletization Methods 0.000 claims description 4
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- 239000000203 mixture Substances 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 13
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical group [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 24
- 238000000354 decomposition reaction Methods 0.000 description 19
- 229910000019 calcium carbonate Inorganic materials 0.000 description 12
- 235000010216 calcium carbonate Nutrition 0.000 description 12
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 10
- 239000000292 calcium oxide Substances 0.000 description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 6
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- 239000002245 particle Substances 0.000 description 5
- 244000261422 Lysimachia clethroides Species 0.000 description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 4
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- 235000012054 meals Nutrition 0.000 description 2
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000005997 Calcium carbide Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 230000008859 change Effects 0.000 description 1
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- 230000003247 decreasing effect Effects 0.000 description 1
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- 239000002075 main ingredient Substances 0.000 description 1
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- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/432—Preheating without addition of fuel
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
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- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Furnace Details (AREA)
Abstract
The invention discloses a powdered lime calcining and reforming system based on a novel dry-process cement clinker calcining system, which comprises a preheater decomposing furnace in the novel dry-process cement clinker calcining system, a secondary suspension calcining system and a suspension cooling system, wherein the preheater decomposing furnace is used as a primary suspension calcining system, the secondary suspension calcining system is composed of a suspension calcining furnace and a cyclone separator, the suspension cooling system comprises a multistage series suspension cooler, and the multistage series suspension cooler is composed of multistage suspension cooler cyclone cylinders which are connected in series. The invention utilizes the existing equipment and facilities of the novel dry-method cement production line to transform the clinker sintering system into the calcined powder lime product, has advanced process, environmental protection, energy conservation and high automation degree, and can realize intelligent operation. Meanwhile, idle equipment can be effectively utilized, a new product field is developed, and enterprise benefits are increased.
Description
Technical Field
The invention relates to the field of a novel dry-process cement clinker sintering system, in particular to a lime powder calcining transformation system based on the novel dry-process cement clinker sintering system.
Background
The active lime is an indispensable important industrial raw material for various industrial departments, is widely used in industries such as calcium carbide, electric power, glass fiber, building materials, papermaking, sewage treatment and the like, and the annual consumption is nearly 3 hundred million tons. The powdered lime is mainly used in the industries of electric desulfurization, glass fiber, building materials, papermaking, sewage treatment and the like, and the market of the powdered lime can be replaced by the powdered lime, and the annual total consumption of the powdered lime is nearly 1.5 hundred million tons.
At present, lime is mainly obtained by calcining massive limestone, production enterprises are small and scattered, and the technology is laggard and the environment is poor. The common limestone calcining device mainly comprises a mechanical shaft kiln, a beam type shaft kiln, a sleeve shaft kiln, a double-hearth shaft kiln and a vertical preheater rotary kiln, and the device has the advantages of low heat exchange efficiency, high calcining heat consumption, difficult guarantee of product quality and uniformity, and the phenomena of surface overburning and internal underfiring and the like in different degrees due to the calcining of massive limestone.
At present, the powdery lime is obtained by selecting, crushing and grinding blocky lime, but the blocky lime is far poorer in grindability than limestone and high in grinding power consumption. With the increasing demand of the powdered lime, the powdered lime calcination process which is green, energy-saving and environment-friendly is more suitable.
The limestone calcination reaction is decomposition of calcium carbonate CaCO3 → CaO + CO2, which is an endothermic reaction, CaCO3 starts to decompose endothermically into CaO and CO2 gas is released when the temperature rises to 550 ℃, the decomposition rate increases with the rise in temperature, and a large amount of decomposition starts at 750 ℃ or higher, and the endothermic amount is 1660kj/kg (397 kcal/kg). The decomposition reaction speed of calcium carbonate is mainly related to factors such as the temperature of a calcining furnace, the partial pressure of CO2, the particle size of calcium carbonate and the like. The limestone particle size is the most important factor influencing the decomposition reaction speed of the calcium carbonate, and the larger the limestone particle is, the deeper the limestone particle is, the slower the permeation of heat and the overflow of CO2 generated by decomposition are, and the slower the decomposition reaction of the calcium carbonate is.
The method for changing limestone from block to powder calcination is the most effective method for improving the decomposition reaction speed of calcium carbonate, namely, the suspension preheating decomposition technology is utilized to complete the preheating and decomposition process of limestone powder in a suspension state. Experiments show that under laboratory conditions, limestone with a particle size of 0.1mm has a complete decomposition time of less than 2 seconds at 950 ℃.
And the suspension preheating decomposition technology is widely applied in China, especially in the cement industry, a clinker firing system of a novel dry cement production line in China is shown as figure 1, and mainly comprises a preheater decomposing furnace 5, a kiln tail smoke chamber 6, a rotary kiln 7, a kiln head burner 9, a grate cooler 8, a waste heat recovery device 4 and a high-temperature fan 3, wherein the preheater decomposing furnace 5 comprises five-stage preheater cyclone cylinders 5-1, 5-2, 5-3, 5-4 and 5-5, a decomposing furnace 5-6 and a gooseneck pipe 5-7, raw powder A taking limestone powder as a main ingredient enters the decomposing furnace 5-6 after being sequentially preheated step by step through four-stage preheater cyclone cylinders 5-1, 5-2, 5-3 and 5-4, is calcined and decomposed in the decomposing furnace 5-6, then enters the fifth-stage preheater cyclone cylinder 5-5 through the gooseneck pipe 5-7 for separation and collection, and then the high-temperature waste gas discharged from the waste gas outlet end of the first-stage preheater cyclone 5-1 is subjected to partial heat recovery by a waste heat recovery device 4, and then is sent to at least one of an external waste gas dedusting system and a raw material grinding system through a dedusting system waste gas pipeline 1 and a raw material grinding system waste gas pipeline 2 by a high-temperature fan 3. A core preheater decomposing furnace of a clinker firing system of a novel dry-method cement production line is a preheating calcining system mainly based on calcium carbonate decomposition reaction, the proportion of limestone in raw meal powder subjected to preheating calcining is about 80-85%, the content of calcium oxide is 43-45%, and the decomposition rate of raw meal powder calcium carbonate discharged from a furnace and fed into the kiln generally reaches 90-95%.
Because the development of the domestic novel dry-process cement industry is rapid, the excess capacity condition of the cement market is gradually intensified in recent years, the state sets industrial policies such as 'total control, structure adjustment, big-to-small change' and the like for the cement industry, and a plurality of novel dry-process cement production lines with small scale and poor benefit are shut down and are left unused. It is possible and necessary to modify the core preheater decomposing furnace of the calcining system to calcine the powdered lime product, meanwhile, the limestone and the fuel can be crushed and stored by using the existing equipment and facilities, the limestone powder can be prepared by using the existing raw material preparation system, the existing raw material homogenization system can be used for storing and metering the feed, and the fuel powder can also be ground and metered by using the existing fuel preparation system, so that a new product field and a live stock asset of a plate are developed for enterprises.
In the modification, raw material powder with a limestone proportion of about 80-85% is changed into single limestone powder, the content of calcium oxide in the limestone is higher, namely the content of calcium oxide in the calcined raw material is increased from 43-45% to 52-55% or higher, and the main technical problems to be solved are how to increase the decomposition rate of calcium carbonate to 97-99% to obtain purer powdered lime and how to cool a high-temperature powdered lime product obtained by calcination.
Disclosure of Invention
The invention aims to provide a powdered lime calcining and reforming system based on a novel dry cement clinker calcining system, which uses the existing preheater decomposing furnace as a primary suspension calcining system to preheat and decompose the fed limestone powder to obtain a powdered lime primary product; a secondary suspension calcining system is added to further decompose the powdered lime primary product obtained by the primary suspension calcining system; and adding a suspension cooling system to cool the powdered lime finished product of the secondary suspension calciner.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
powder lime calcination transformation system based on novel dry process cement clinker system of firing burns, including the preheater dore furnace in the novel dry process cement clinker system of firing, the preheater dore furnace includes multistage preheater whirlwind section of thick bamboo, dore furnace, its characterized in that: regard as one-level suspension system of calcining with preheater dore furnace, still include second grade suspension system of calcining, suspension cooling system, wherein:
in the first-stage suspension calcining system, limestone powder as a raw material is sequentially preheated by the cyclone cylinders of all stages of preheaters except the last stage and then enters a decomposing furnace, the limestone powder is calcined in the decomposing furnace to obtain a primary product of powdered lime, the primary product of powdered lime enters the cyclone cylinders of the last stage of preheaters for separation and collection,
the secondary suspension calcining system comprises a suspension calcining furnace and a cyclone separator, wherein the discharge end of a cyclone cylinder of a last stage preheater in the primary suspension calcining system is connected with the feed end of the suspension calcining furnace, the discharge end of the suspension calcining furnace is connected with the feed end of the cyclone separator, the collected primary powdered lime product is sent into the suspension calcining furnace by the cyclone cylinder of the last stage preheater in the primary suspension calcining system for further calcining to obtain finished powdered lime, and the finished powdered lime is sent into the cyclone separator for separation and collection by the suspension calcining furnace;
the suspension cooling system comprises multistage series suspension coolers, the multistage series suspension coolers are formed by connecting multistage suspension cooler cyclone cylinders in series, wherein the feed end of a first stage suspension cooler cyclone cylinder is connected with the discharge end of a cyclone separator in the second stage suspension calcining system, the discharge end of an adjacent previous stage suspension cooler cyclone cylinder is connected with the feed end of a next stage suspension cooler cyclone cylinder, the finished product powder lime in the cyclone separator is subjected to heat exchange cooling in sequence through the multistage suspension cooler cyclone cylinders, the finished product powder lime is finally collected by the last stage suspension cooler cyclone cylinder, and the finished product powder lime is discharged from the discharge end of the last stage suspension cooler cyclone cylinder.
The lime powder calcining and reforming system based on the novel dry-process cement clinker calcining system is characterized in that: in the primary suspension calcining system, an original kiln tail smoke chamber of the decomposing furnace is replaced by an air inlet chamber; and the waste gas outlet end of the cyclone separator in the secondary suspension calcining system is communicated with the air inlet of the air inlet chamber of the decomposing furnace, and the waste gas discharged by the cyclone separator enters the air inlet chamber of the decomposing furnace to be used as combustion air and suspension medium flue gas of the decomposing furnace.
The lime powder calcining and reforming system based on the novel dry-process cement clinker calcining system is characterized in that: still include the waste heat recovery device among the novel dry process cement clinker system of firing into, the high temperature fan, the waste gas outlet end and the inlet connection of waste heat recovery device of first order preheater whirlwind section of thick bamboo in the system are calcined in the one-level suspension, the outlet end of waste heat recovery device and the inlet connection of high temperature fan, the outlet end and the dust pelletizing system exhaust gas pipeline of high temperature fan, at least one of the two of raw materials grinding system exhaust gas pipeline is connected, after the high temperature waste gas of first order preheater whirlwind section of thick bamboo discharge was retrieved partial heat by waste heat recovery device, send outside waste gas dust pelletizing system to through the high temperature fan again, at least one of the two.
The lime powder calcining and reforming system based on the novel dry-process cement clinker calcining system is characterized in that: the suspension calciner in the secondary suspension calcining system is provided with an auxiliary combustion ignition chamber, and combustion air and combustion fuel are introduced into the suspension calciner from the auxiliary combustion ignition chamber so as to ignite and improve the combustion air temperature of the suspension calciner;
the suspension cooling system also comprises a cooler exhaust fan, the hot air outlet end of the first stage suspension cooler cyclone cylinder in the suspension cooling system is connected with the inlet end of the cooler exhaust fan, the outlet end of the cooler exhaust fan is connected with the inlet end of the auxiliary combustion ignition chamber, and most of hot air exhausted by the first stage suspension cooler cyclone cylinder is sent into the auxiliary combustion ignition chamber through the cooler exhaust fan to support combustion of the suspension calciner.
The lime powder calcining and reforming system based on the novel dry-process cement clinker calcining system is characterized in that: the outlet end of the exhaust fan of the cooler is also connected with a waste gas pipeline of the dust removal system through an air release valve, and the rest of hot air exhausted by the cyclone cylinder of the first-stage suspension cooler is sent to the waste gas pipeline of the dust removal system through the exhaust fan of the cooler and the air release valve.
The lime powder calcining and reforming system based on the novel dry-process cement clinker calcining system is characterized in that: the fuel used by the decomposing furnace and the suspension calcining furnace is one or a mixture of more of coal, natural gas, fuel oil and petroleum coke in any proportion.
The lime powder calcining and reforming system based on the novel dry-process cement clinker calcining system is characterized in that: and the outlet temperature of the decomposing furnace of the primary suspension calcining system is controlled to be 850-930 ℃.
The lime powder calcining and reforming system based on the novel dry-process cement clinker calcining system is characterized in that: and the temperature of the outlet of the suspension calciner of the secondary suspension calcining system is controlled to be 900-980 ℃.
The invention has the advantages that:
the modified powdered lime secondary suspension calcining cooling system organically integrates the processes of limestone powder preheating, decomposition, secondary re-decomposition and powdered lime cooling, and the whole process is completed in a suspension state. Therefore, the heat efficiency is high, and the energy consumption of the system is low; the reaction speed is high, the temperature distribution is uniform and controllable, the product quality is stable, and the content of active calcium oxide in the finished product of powdered lime can be effectively controlled;
the existing environmental protection facilities of the novel dry-method cement production line are complete and high in mechanical automation degree, and the improved powder lime secondary suspension calcining cooling system is favorable for realizing green energy conservation and intelligent operation.
The novel dry-method cement production line accumulates abundant experience in the aspects of operation, management, operation and the like of the existing suspension preheating decomposition system and can be used for reference.
The idle equipment and facilities of the novel dry-process cement production line are effectively utilized, a new product field is developed, and enterprise benefits are increased.
Drawings
FIG. 1 is a schematic diagram of a novel dry process cement clinker firing system of the prior art.
Fig. 2 is a block diagram of the system of the present invention.
In the figure: the device comprises a dust removal system waste gas pipeline 1, a raw material grinding system waste gas pipeline 2, a high-temperature fan 3, a waste heat recovery device 4, a preheater decomposing furnace 5, a C1 cyclone 5-1, a C2 cyclone 5-2, a C3 cyclone 5-3, a C4 cyclone 5-4, a C5 cyclone 5-5, a decomposing furnace 5-6, a gooseneck 5-7, a kiln tail smoke chamber 6, a rotary kiln 7, a grate cooler 8, a kiln head burner 9, a two-stage series suspension cooler 10, a CL1 cyclone 10-1, a CL2 cyclone 10-2, a cooler exhaust fan 11, an air release valve 12, an air inlet chamber 13, an auxiliary ignition chamber 14, a suspension calciner 15 and a cyclone separator 16. A is raw material powder, B is cement clinker, C is limestone powder, D is a powdered lime primary product, and E is a powdered lime finished product.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in fig. 2, the system for calcining and transforming lime powder based on the novel dry cement clinker sintering system comprises a preheater decomposing furnace 5 in the novel dry cement clinker sintering system, wherein the preheater decomposing furnace 5 comprises five-stage preheater cyclones 5-1, 5-2, 5-3, 5-4, 5-5 and a decomposing furnace 5-6, the preheater decomposing furnace is used as a primary suspension calcining system, and the system further comprises a secondary suspension calcining system and a suspension cooling system, wherein:
in the first-stage suspension calcination system, the limestone powder C is preheated by the cyclone cylinders 5-1, 5-2, 5-3 and 5-4 of the preheaters at all stages except the last stage in sequence and then enters a decomposing furnace 5-6, the limestone powder C is calcined in the decomposing furnace 5-6 to obtain a primary product D of powdered lime, and the primary product D of powdered lime enters the cyclone cylinder 5-5 of the last stage preheater through a gooseneck 5-7 to be separated and collected;
the secondary suspension calcining system comprises a suspension calcining furnace 15 and a cyclone separator 16, wherein the discharge end of a last stage preheater cyclone cylinder 5-5 in the primary suspension calcining system is connected with the feed end of the suspension calcining furnace 15, the discharge end of the suspension calcining furnace 15 is connected with the feed end of the cyclone separator 16, a collected lime powder primary product D is sent into the suspension calcining furnace 15 by the last stage preheater cyclone cylinder 5-5 in the primary suspension calcining system for further calcining to obtain a finished lime powder E, and the finished lime powder E is sent into the cyclone separator 16 from the suspension calcining furnace 15 for separation and collection;
the suspension cooling system comprises a two-stage series suspension cooler 10, the two-stage series suspension cooler 10 is formed by connecting two-stage suspension cooler cyclone cylinders 10-1 and 10-2 in series, wherein the feed end of the first stage suspension cooler cyclone 10-1 is connected with the discharge end of the cyclone separator 16 in the second stage suspension calcining system, the discharge end of the first stage suspension cooler cyclone 10-1 is connected with the feed end of the second stage suspension cooler cyclone 10-2, meanwhile, air is introduced into the feeding end of the second stage suspension cooler cyclone cylinder 10-2, the finished product powder lime E in the cyclone separator 16 is subjected to heat exchange and cooling in turn through the two stage suspension cooler cyclone cylinders 10-1 and 10-2, and finally the finished product powder lime E is collected by the second stage suspension cooler cyclone cylinder 10-2, and the finished product powder lime E is discharged from the discharge end of the second-stage suspension cooler cyclone cylinder 10-2.
In the primary suspension calcining system, an original kiln tail smoke chamber of a decomposing furnace 5-6 is replaced by an air inlet chamber 13; the waste gas outlet end of the cyclone separator 16 in the secondary suspension calcining system is communicated with the air inlet of the air inlet chamber 13 of the decomposing furnace 5-6, and the waste gas discharged by the cyclone separator 16 enters the air inlet chamber 13 of the decomposing furnace 5-6 to be used as the combustion air and the suspension medium smoke of the decomposing furnace 5-6.
The invention also comprises a waste heat recovery device 4 and a high-temperature fan 3 in the novel dry-method cement clinker sintering system, wherein the waste gas outlet end of the first-stage preheater cyclone 5-1 in the first-stage suspension calcining system is connected with the inlet end of the waste heat recovery device 4, the outlet end of the waste heat recovery device 4 is connected with the inlet end of the high-temperature fan 3, the outlet end of the high-temperature fan 3 is connected with at least one of the waste gas pipeline 1 of the dust removal system and the waste gas pipeline 2 of the raw material grinding system, and the high-temperature waste gas discharged by the first-stage preheater cyclone 5-1 is sent to at least one of the external waste gas dust removal system and the raw material grinding system through the high-temperature fan 3 after.
In the invention, the suspension calciner 15 in the secondary suspension calcining system is provided with an auxiliary combustion ignition chamber 14, and combustion air and combustion fuel are introduced into the suspension calciner 15 by the auxiliary combustion ignition chamber 14 so as to ignite and improve the combustion air temperature of the suspension calciner;
the suspension cooling system also comprises a cooler exhaust fan 11, the hot air outlet end of the first-stage suspension cooler cyclone cylinder 10-1 in the suspension cooling system is connected with the inlet end of the cooler exhaust fan 11, the outlet end of the cooler exhaust fan 11 is connected with the inlet end of the auxiliary combustion ignition chamber 14, and most of the hot air exhausted by the first-stage suspension cooler cyclone cylinder 10-1 is sent to the auxiliary combustion ignition chamber 14 through the cooler exhaust fan 11 to support combustion of the suspension calciner.
In the invention, the outlet end of the exhaust fan 11 of the cooler is also connected with the exhaust gas pipeline 1 of the dust removal system through the air release valve 12, and the rest part of the hot air exhausted by the first-stage suspension cooler 10-1 is sent to the exhaust gas pipeline 1 of the dust removal system through the exhaust fan 11 of the cooler and the air release valve 12.
In the invention, the fuel used by the decomposing furnace and the suspension calcining furnace is one or a mixture of more of coal, natural gas, fuel oil and petroleum coke in any proportion.
In the invention, the outlet temperature of the decomposing furnace of the primary suspension calcining system is controlled to be 850-930 ℃. The temperature of the outlet of the suspension calciner of the secondary suspension calcining system is controlled to be 900-980 ℃.
The invention improves the clinker sintering system of the novel dry-method cement production line into a powdered lime secondary suspension calcining cooling system for producing powdered lime. It is characterized in that:
(1) utilize current preheater dore furnace 5 as one-level suspension system of calcining
Limestone powder C serving as a raw material is firstly fed into an inlet pipeline of a first-stage preheater cyclone 5-1, is preheated by the preheater cyclones 5-1, 5-2, 5-3 and 5-4 step by step and then is collected by a fourth-stage preheater cyclone 5-4, and then enters a decomposing furnace 5-6, the limestone powder C serving as the raw material is calcined in the decomposing furnace 5-6 by fuel under the environment of combustion air, and a primary product D of powdered lime obtained after calcination is separated and collected by a fifth-stage preheater cyclone 5-5.
The invention changes the kiln tail smoke chamber under the existing decomposing furnace 5-6 into the air inlet chamber 13, and introduces combustion air and suspension medium smoke into the decomposing furnace 5-6.
After part of heat is recovered by the waste heat recovery device 4, the high-temperature waste gas at the outlet of the cyclone cylinder 5-1 of the first-stage preheater is sent to an external waste gas dedusting system or a raw material grinding system through the high-temperature fan 3.
(2) Adding a two-stage suspension calcining system
The secondary suspension calcining system comprises a suspension calcining furnace 15, a cyclone separator 16, an auxiliary combustion ignition chamber 14 and the like, and further decomposes a powdered lime primary product D obtained by the primary suspension calcining system.
The primary product D of the powdered lime collected by the cyclone 5-5 of the fifth-stage preheater enters a newly added suspension calciner 15 through a discharge pipe, the primary product D of the powdered lime is further calcined in the suspension calciner 8 in a combustion air environment by using fuel, the suspension calciner 15 is initially in a pure air environment, wherein the carbon dioxide partial pressure is lower than the flue gas, and the oxygen partial pressure is higher than the flue gas, so that the fuel combustion and the further decomposition of the calcium carbonate which is not decomposed in the primary product D of the powdered lime are facilitated. The finished product powder lime E obtained after the calcination is separated and collected by a cyclone separator 16, and the waste gas at the outlet of the cyclone separator 16 is sent to an air inlet chamber 13 below the decomposing furnace 5-6 by a pipeline to be used as the combustion air and the suspension medium flue gas of the decomposing furnace 5-6.
The lower end of the suspension calciner 15 is connected with an auxiliary combustion ignition chamber 14 through a necking, and the auxiliary combustion ignition chamber 14 introduces combustion air into the suspension calciner 15, ignites and burns fuel to increase the temperature of the combustion air.
(3) Adding a suspension cooling system
The suspension cooling system comprises a secondary suspension cooler 10, a cooler exhaust fan 11 and the like which are connected in series, and the finished product powder lime E of the secondary suspension calciner is cooled.
The finished product powder lime E out of the suspension calciner 15 is separated and collected by a cyclone separator 16, then is fed into an inlet pipeline of a first-stage suspension cooler cyclone cylinder 10-1, and is separated from the first-stage suspension cooler cyclone cylinder 10-1 through heat exchange; then feeding into an inlet pipeline of a second stage suspension cooler cyclone cylinder 10-2, wherein cold air enters from the feeding end of the second stage suspension cooler cyclone cylinder 10-2, and is separated and collected by the second stage suspension cooler cyclone cylinder 10-2 through heat exchange.
The second-stage series suspension cooler 10 cools the finished product powder lime E to obtain hot air at the outlet of the cyclone cylinder 10-1 of the first-stage suspension cooler, most of the hot air is sent into the suspension calciner 15 through the cooler exhaust fan 11 to be burnt and supported by fuel, and a small part of redundant hot air is sent into the pipeline 1 of the waste gas dedusting system through the air release valve 12.
In the embodiment, the outlet temperature of the decomposing furnace 5-6 of the primary suspension calcining system is controlled to be 850-930 ℃, and the outlet temperature of the suspension calcining furnace 15 of the secondary suspension calcining system is controlled to be 900-980 ℃.
In this embodiment, the fuel used in the decomposing furnaces 5 to 6 and the suspension calcining furnace 15 is one or more of coal, natural gas, fuel oil and petroleum coke.
In this embodiment, the number of the preheater of the existing preheater decomposing furnace 5 is five, but not limited thereto. And six or four stages are also possible.
In this embodiment, various optimization modifications may be performed on the constituent units of the existing preheater decomposing furnace 5 for the purpose of reducing resistance, increasing efficiency, and the like, including increasing or decreasing the number of the primary preheaters.
In this embodiment, the number of stages in which the two-stage series suspension coolers 10 are connected in series is two, but is not limited thereto. Three stages are also possible.
In this embodiment, the hot air of the secondary suspension cooler 10 may be introduced to the fuel pulverizing system as a heat source for drying the fuel.
The embodiments of the present invention are described only for the preferred embodiments of the present invention, and not for the limitation of the concept and scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall into the protection scope of the present invention, and the technical content of the present invention which is claimed is fully set forth in the claims.
Claims (8)
1. Powder lime calcination transformation system based on novel dry process cement clinker system of firing burns, including the preheater dore furnace in the novel dry process cement clinker system of firing, the preheater dore furnace includes multistage preheater whirlwind section of thick bamboo, dore furnace, its characterized in that: regard as one-level suspension system of calcining with preheater dore furnace, still include second grade suspension system of calcining, suspension cooling system, wherein:
in the first-stage suspension calcining system, limestone powder as a raw material is sequentially preheated by the cyclone cylinders of all stages of preheaters except the last stage and then enters a decomposing furnace, the limestone powder is calcined in the decomposing furnace to obtain a primary product of powdered lime, the primary product of powdered lime enters the cyclone cylinders of the last stage of preheaters for separation and collection,
the secondary suspension calcining system comprises a suspension calcining furnace and a cyclone separator, wherein the discharge end of a cyclone cylinder of a last stage preheater in the primary suspension calcining system is connected with the feed end of the suspension calcining furnace, the discharge end of the suspension calcining furnace is connected with the feed end of the cyclone separator, the collected primary powdered lime product is sent into the suspension calcining furnace by the cyclone cylinder of the last stage preheater in the primary suspension calcining system for further calcining to obtain finished powdered lime, and the finished powdered lime is sent into the cyclone separator for separation and collection by the suspension calcining furnace;
the suspension cooling system comprises multistage series suspension coolers, the multistage series suspension coolers are formed by connecting multistage suspension cooler cyclone cylinders in series, wherein the feed end of a first stage suspension cooler cyclone cylinder is connected with the discharge end of a cyclone separator in the second stage suspension calcining system, the discharge end of an adjacent previous stage suspension cooler cyclone cylinder is connected with the feed end of a next stage suspension cooler cyclone cylinder, the finished product powder lime in the cyclone separator is subjected to heat exchange cooling in sequence through the multistage suspension cooler cyclone cylinders, the finished product powder lime is finally collected by the last stage suspension cooler cyclone cylinder, and the finished product powder lime is discharged from the discharge end of the last stage suspension cooler cyclone cylinder.
2. The system of claim 1, wherein the system comprises: in the primary suspension calcining system, an original kiln tail smoke chamber of the decomposing furnace is replaced by an air inlet chamber; and the waste gas outlet end of the cyclone separator in the secondary suspension calcining system is communicated with the air inlet of the air inlet chamber of the decomposing furnace, and the waste gas discharged by the cyclone separator enters the air inlet chamber of the decomposing furnace to be used as combustion air and suspension medium flue gas of the decomposing furnace.
3. The system of claim 1, wherein the system comprises: still include the waste heat recovery device among the novel dry process cement clinker system of firing into, the high temperature fan, the waste gas outlet end and the inlet connection of waste heat recovery device of first order preheater whirlwind section of thick bamboo in the system are calcined in the one-level suspension, the outlet end of waste heat recovery device and the inlet connection of high temperature fan, the outlet end and the dust pelletizing system exhaust gas pipeline of high temperature fan, at least one of the two of raw materials grinding system exhaust gas pipeline is connected, after the high temperature waste gas of first order preheater whirlwind section of thick bamboo discharge was retrieved partial heat by waste heat recovery device, send outside waste gas dust pelletizing system to through the high temperature fan again, at least one of the two.
4. The system of claim 1, wherein the system comprises: the suspension calciner in the secondary suspension calcining system is provided with an auxiliary combustion ignition chamber, and combustion air and combustion fuel are introduced into the suspension calciner from the auxiliary combustion ignition chamber so as to ignite and improve the combustion air temperature of the suspension calciner;
the suspension cooling system also comprises a cooler exhaust fan, the hot air outlet end of the first stage suspension cooler cyclone cylinder in the suspension cooling system is connected with the inlet end of the cooler exhaust fan, the outlet end of the cooler exhaust fan is connected with the inlet end of the auxiliary combustion ignition chamber, and most of hot air exhausted by the first stage suspension cooler cyclone cylinder is sent into the auxiliary combustion ignition chamber through the cooler exhaust fan to support combustion of the suspension calciner.
5. The pulverized lime calcination modification system based on the novel dry cement clinker firing system as claimed in claim 3 or 4, wherein: the outlet end of the exhaust fan of the cooler is also connected with a waste gas pipeline of the dust removal system through an air release valve, and the rest of hot air exhausted by the cyclone cylinder of the first-stage suspension cooler is sent to the waste gas pipeline of the dust removal system through the exhaust fan of the cooler and the air release valve.
6. The system of claim 1, wherein the system comprises: the fuel used by the decomposing furnace and the suspension calcining furnace is one or a mixture of more of coal, natural gas, fuel oil and petroleum coke in any proportion.
7. The system of claim 1, wherein the system comprises: and the outlet temperature of the decomposing furnace of the primary suspension calcining system is controlled to be 850-930 ℃.
8. The system of claim 1, wherein the system comprises: and the temperature of the outlet of the suspension calciner of the secondary suspension calcining system is controlled to be 900-980 ℃.
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| CN113045224A (en) * | 2021-03-10 | 2021-06-29 | 中国中材国际工程股份有限公司 | System and method for preparing powdery active lime by modifying cement clinker production line |
| CN113185152A (en) * | 2021-04-28 | 2021-07-30 | 浙江钙科机械设备有限公司 | High-quality calcium oxide grading suspension calcination production line and suspension calcination process thereof |
| CN113493211A (en) * | 2021-05-24 | 2021-10-12 | 合肥水泥研究设计院有限公司 | Spodumene concentrate suspension drying calcination transformation process |
| CN113511824A (en) * | 2021-05-08 | 2021-10-19 | 浙江钙科机械设备有限公司 | Suspension calcining process for large-particle calcium oxide |
| CN114956610A (en) * | 2022-05-20 | 2022-08-30 | 南京乐巨国际工程有限公司 | Carbide slag suspension calcining system |
| CN116854383A (en) * | 2023-06-29 | 2023-10-10 | 唐金泉 | Novel low-energy-consumption process system for producing light-burned MgO powder |
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