CN113446608A - Dry cement preheating decomposition system - Google Patents

Dry cement preheating decomposition system Download PDF

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Publication number
CN113446608A
CN113446608A CN202110752605.6A CN202110752605A CN113446608A CN 113446608 A CN113446608 A CN 113446608A CN 202110752605 A CN202110752605 A CN 202110752605A CN 113446608 A CN113446608 A CN 113446608A
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China
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garbage
furnace
air duct
treatment chamber
dry cement
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CN202110752605.6A
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罗翔
夏毅
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Sinoma Suzhou Construction Co ltd
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Sinoma Suzhou Construction Co ltd
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Priority to CN202110752605.6A priority Critical patent/CN113446608A/en
Publication of CN113446608A publication Critical patent/CN113446608A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F23G5/033—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment comminuting or crushing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
    • F23G5/14—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion
    • F23G5/16—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion in a separate combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F23J15/025—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F23J15/027—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using cyclone separators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • 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
    • F27B19/00—Combinations of furnaces of kinds not covered by a single preceding main group
    • F27B19/04—Combinations of furnaces of kinds not covered by a single preceding main group arranged for associated working
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2201/00—Pretreatment
    • F23G2201/80—Shredding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2202/00—Combustion
    • F23G2202/10—Combustion in two or more stages
    • F23G2202/103—Combustion in two or more stages in separate chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2204/00—Supplementary heating arrangements
    • F23G2204/10—Supplementary heating arrangements using auxiliary fuel
    • F23G2204/101—Supplementary heating arrangements using auxiliary fuel solid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00—Preventing emissions
    • F23J2215/20—Sulfur; Compounds thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00—Preventing emissions
    • F23J2215/30—Halogen; Compounds thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00—Preventing emissions
    • F23J2215/30—Halogen; Compounds thereof
    • F23J2215/301—Dioxins; Furans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2217/00—Intercepting solids
    • F23J2217/10—Intercepting solids by filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2217/00—Intercepting solids
    • F23J2217/40—Intercepting solids by cyclones

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention discloses a dry-method cement preheating decomposition system which comprises a decomposition furnace, wherein one side of the decomposition furnace is provided with a decomposition assisting mechanism, the lower end of the decomposition furnace is provided with a pulverized coal burner, one side of the pulverized coal burner is provided with a dilution cooler, one side of the dilution cooler is connected with a dilution air blower, the upper end of the dilution cooler is connected with a cyclone separator, the upper end of the cyclone separator is connected with chlorine removal equipment, one side of the chlorine removal equipment is connected with a dust collector, and one side of the dust collector is connected with a draught fan; and a rotary kiln is also arranged on one side of the pulverized coal burner. The system can treat harmful gas (dioxin) in the household garbage incineration process in a dry cement preheating decomposition system.

Description

Dry cement preheating decomposition system
Technical Field
The invention relates to the technical field of cement production, in particular to a dry-method cement preheating decomposition system.
Background
Along with the improvement of living standard of people, the discharge of domestic garbage is more and more. At present, the stock of municipal solid waste in China reaches 60 hundred million tons, occupies 5 hundred million square meters of cultivated land, produces 2 hundred million tons of municipal solid waste every year, and is rapidly increased by 9 percent. These huge amounts of domestic waste have posed a growing threat to the urban and periurban ecological environment.
The traditional garbage disposal methods comprise a landfill method, a composting method and an incineration method, the municipal garbage disposal in China starts late, and the sanitary landfill is mainly used at present. Although waste incineration and power plants are built in some cities, the waste incineration method still has a certain controversy at present due to the problems of low treatment capacity, and discharge of harmful gas (dioxin), sewage (landfill leachate), waste residues (high heavy metal content) and the like in the treatment process.
The unique production process (alkaline gas content, high temperature of more than 1000 ℃) of the dry cement production provides excellent conditions for treating the municipal solid waste, and firstly, a cement firing system can be utilized to eliminate harmful gas (dioxin) in the waste storage and incineration process; and secondly, part of high-temperature waste gas generated by the cement kiln system can be used as a supplementary heat source or a whole heat source for waste incineration, so that the incineration process of the waste is more sufficient, and the emission of dioxin is further reduced or even eliminated. Realizes the harmless and recycling of the garbage treatment.
Therefore, a dry-method cement preheating decomposition system capable of treating household garbage is designed.
Disclosure of Invention
Therefore, the invention provides a dry cement preheating decomposition system, which can treat harmful gas (dioxin) in the household garbage incineration process in the dry cement preheating decomposition system.
In order to achieve the above purpose, the invention provides the following technical scheme: a dry-method cement preheating decomposition system comprises a decomposition furnace, wherein a decomposition assisting mechanism is arranged on one side of the decomposition furnace, a pulverized coal burner is arranged at the lower end of the decomposition furnace, a dilution cooler is arranged on one side of the pulverized coal burner, a dilution air blower is connected to one side of the dilution cooler, a cyclone separator is connected to the upper end of the dilution cooler, a chlorine removal device is connected to the upper end of the cyclone separator, a dust collector is connected to one side of the chlorine removal device, and a draught fan is connected to one side of the dust collector;
a rotary kiln is further arranged on one side of the pulverized coal burner;
the decomposition assisting mechanism comprises a sealed garbage treatment chamber, a garbage unloading platform is arranged on one side of the garbage treatment chamber, a garbage transfer chamber is further arranged on one side of the garbage treatment chamber, a garbage carrying device is arranged at the top of the garbage treatment chamber, deodorizing equipment is arranged on the other side of the garbage treatment chamber, a first garbage pit and a second garbage pit are arranged on one side of the bottom of the garbage treatment chamber, a garbage crusher is arranged on the other side of the bottom of the garbage treatment chamber, the lower end of the garbage crusher is connected with the second garbage pit, a garbage supply device is further arranged on the other side of the bottom of the garbage treatment chamber, the lower end of the garbage supply device is connected with an oxidizing furnace through a pipeline, the lower end of the oxidizing furnace is connected with a circulating device, one side of the circulating device is connected with non-combustible sorting equipment, and one side of the circulating device is also connected with combustion-supporting equipment, one side of the combustion-supporting equipment is connected with the oxidation furnace, one side of the oxidation furnace is connected with an air heater, and the top end of the oxidation furnace is connected with the decomposition furnace through a second pipeline.
Further, the pulverized coal burner comprises a four-layer air duct structure which is respectively a cooling air duct, an axial flow air duct, a coal air duct and a rotational flow air duct from outside to inside.
Furthermore, the air outlet of the axial flow air duct is composed of 8 air ducts, cooling pipes are arranged between adjacent air ducts, and the air ducts and the cooling pipes are distributed in an annular direction.
Furthermore, the air outlet of the rotational flow air channel consists of 12 air channels, cooling pipes are arranged between adjacent air channels, the air channels and the cooling pipes are distributed in an annular direction, and the rotational direction of the air outlet of the rotational flow air channel is the same as that of the rotary kiln.
Further, a flame holding cover is arranged on the periphery of the cooling air duct.
Further, the first pipeline is provided with a first control regulating valve.
Further, the second pipeline is provided with a second control regulating valve.
Further, the decomposing furnace is a TTF furnace.
The invention has the beneficial effects that:
1. the smoke of the garbage incinerator is combusted and decomposed by fully utilizing the high-temperature condition of the rotary kiln and the decomposing furnace above 850 ℃, and the residence time of the smoke in the decomposing furnace reaches more than 4 seconds, so that the aim of thoroughly decomposing organic matters in the garbage is fulfilled, the formation amount of harmful substances such as dioxin and the like is greatly reduced, and the smoke is lower than the national standard requirement of the garbage incinerator for incinerating harmful substance emission.
2. The method fully utilizes the alkaline components such as calcium oxide, calcium carbonate and the like in the raw material powder in the rotary kiln system, SO that the acidic gas and substances generated by waste incineration are fully absorbed, washed and purified by the raw material powder, SO2, Cl and the like are fixed by synthetic salts, and the re-synthesis of the acidic harmful gas and dioxin in the flue gas after the waste incineration is greatly reduced.
3. Through sealed refuse treatment room, be provided with rubbish transfer room in one side of refuse treatment room, can effectively prevent the excessive of rubbish peculiar smell gas, and the refuse treatment room still is provided with deodorization equipment, eliminates the peculiar smell in the refuse treatment room, and this part gas is sent into the cement clinker cooler simultaneously to it makes harmful gas obtain thorough burning to get into rotary kiln and decomposition furnace.
4. During the decomposition of CaC03, nascent Ca0 is formed, which has high activation energy and strong reactivity. In the decomposing furnace, the decomposing rate of the materials entering the kiln is at least over 90 percent, and only a small amount of carbonate decomposing tasks are left to be completed in the kiln. The high-temperature zone in the furnace is only limited in the flame radiation section, and for a decomposing furnace with the general length-diameter ratio of L/D of 14-16, the materials which have completed the decomposition task need to stay in a transition zone at 900-1300 ℃ for too long time, generally 15-16 min, so that the material heating process is delayed. Therefore, the reactivity of Ca0 is not fully embodied, resulting in the growth of C2S and Ca0 minerals. Because the clinker is not heated rapidly by enough heat, the agglomeration and sintering of the clinker are restricted, and the structure of the clinker is poor. The system utilizes the smoke generated by the decomposition assisting mechanism to contain a large amount of heat, so that the decomposition furnace can be rapidly heated, the granulation and sintering of clinker are promoted, and the sintering quality of the clinker is improved.
5. The pulverized coal burner of the system is of a four-channel type, and has no abrasion in the use process and long service life; the thrust of the combustor is large and can reach more than 1500m/s, and the adaptability to various coal qualities is good.
Drawings
FIG. 1 is a schematic view of the overall structure provided by the present invention;
fig. 2 is a schematic structural view of the pulverized coal burner provided by the present invention.
In the figure: 1. a decomposing furnace; 2. a pulverized coal burner; 3. a dilution cooler; 4. a dilution blower; 5. a cyclone separator; 6. a dechlorination device; 7. a dust collector; 8. an induced draft fan; 9. a rotary kiln; 10. a waste disposal chamber; 11. unloading the garbage platform; 12. a garbage transfer chamber; 13. a refuse handling device; 14. a deodorizing device; 15. a first garbage pit; 16. a second garbage pit; 17. a garbage crusher; 18. a waste supply device; 19. a first pipeline; 20. controlling the first regulating valve; 21. an oxidation furnace; 22. a circulation device; 23. a non-combustible sorting device; 24. combustion-supporting equipment; 25. a hot air blower; 26. a second pipeline; 27. controlling a regulating valve II; 201. a cooling air duct; 202. an axial flow duct; 203. a coal air duct; 204. a swirling flow air duct; 205. a flame gathering cover; 206. and (7) cooling the tube.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
The embodiment of the invention relates to a dry-method cement preheating decomposition system, and in reference to the attached drawings 1-2, the dry-method cement preheating decomposition system provided by the invention comprises a decomposition furnace 1, wherein a decomposition assisting mechanism is arranged on one side of the decomposition furnace 1, a pulverized coal burner 2 is arranged at the lower end of the decomposition furnace 1, a dilution cooler 3 is arranged on one side of the pulverized coal burner 2, a dilution blower 4 is connected to one side of the dilution cooler 3, a cyclone separator 5 is connected to the upper end of the dilution cooler 3, a chlorine removal device 6 is connected to the upper end of the cyclone separator 5, a dust collector 7 is connected to one side of the chlorine removal device 6, and a draught fan 8 is connected to one side of the dust collector 7;
a rotary kiln 9 is also arranged on one side of the pulverized coal burner 2;
the decomposition assisting mechanism comprises a sealed garbage treatment chamber 10, a garbage unloading platform 11 is arranged on one side of the garbage treatment chamber 10, a garbage transfer chamber 12 is further arranged on one side of the garbage treatment chamber 10, a garbage carrying device 13 is arranged at the top of the garbage treatment chamber 10, a deodorizing device 14 is arranged on the other side of the garbage treatment chamber 10, a garbage pit I15 and a garbage pit II 16 are arranged on one side of the bottom of the garbage treatment chamber 10, a garbage crusher 17 is arranged on the other side of the bottom of the garbage treatment chamber 10, the lower end of the garbage crusher 17 is connected with the garbage pit II 16, a garbage supply device 18 is further arranged on the other side of the bottom of the garbage treatment chamber 10, the lower end of the garbage supply device 18 is connected with an oxidation furnace 21 through a pipeline I19, the lower end of the oxidation furnace 21 is connected with a circulating device 22, and one side of the circulating device 22 is connected with a non-combustible sorting device 23, one side of the circulating device 22 is also connected with combustion-supporting equipment 24, one side of the combustion-supporting equipment 24 is connected with the oxidation furnace 21, one side of the oxidation furnace 21 is connected with a hot air blower 25, and the top end of the oxidation furnace 21 is connected with the decomposition furnace 1 through a second pipeline 26.
In this embodiment, the pulverized coal burner 2 includes a four-layer air duct structure, which includes a cooling air duct 201, an axial flow air duct 202, a coal air duct 203, and a rotational flow air duct 204 from outside to inside.
In this embodiment, the air outlet of the axial flow air duct 202 is composed of 8 air ducts, cooling pipes 206 are disposed between adjacent air ducts, and the air ducts and the cooling pipes 206 are distributed in an annular direction.
In this embodiment, the air outlet of the swirling air duct 204 is composed of 12 air ducts, the cooling pipes 206 are arranged between adjacent air ducts, the air ducts and the cooling pipes 206 are distributed in an annular direction, and the swirling direction of the air outlet of the swirling air duct 204 is the same as that of the rotary kiln 9.
In this embodiment, a flame collecting cover 205 is disposed on the periphery of the cooling air duct 201. The flame-gathering hood 205 has an annular structure to improve the usability and cooling performance. When the length of the flame-holding cover 205 is the same as the length of the cooling air duct 201, the flame-holding cover 205 is in a "0" position state, at this time, the length of the flame-holding cover 205 is 25mm, and an expansion joint and an adjusting screw rod are arranged on the flame-holding cover 205 for adjusting the length of the flame-holding cover 205.
In this embodiment, the first pipe 19 is provided with a first control regulating valve 20.
In this embodiment, the second pipe 26 is provided with a second control regulating valve 27.
In this embodiment, the decomposing furnace 1 is a TTF furnace.
The working principle and the working process of the invention are as follows:
the garbage truck conveys household garbage to a garbage unloading platform 11, the household garbage enters a garbage transfer chamber 12 to be unloaded to a first garbage pit 15, a garbage conveying device 13 conveys the garbage in the first garbage pit 15 to a material inlet of a garbage crusher 17, the garbage enters the garbage crusher 17 from the material inlet of the garbage crusher 17, the crushed garbage enters the first garbage pit 15 from the garbage crusher 17, the garbage conveying device 13 conveys the garbage in the second garbage pit 16 to a material inlet of a garbage supply device 18, the garbage enters the garbage supply device 18 from the material inlet of the garbage supply device 18, the garbage in the garbage supply device 18 enters an oxidation furnace 21 through a first pipeline 19, the first pipeline 19 is provided with a first adjusting control valve for controlling the flow rate of the garbage, after the garbage in the oxidation furnace 21 is fully reacted, the garbage which is not fully reacted and is not combustible enters a circulating device 22, and the circulating device 22 circulates the garbage which is not fully reacted to a combustion-supporting device 24 to be reacted again, the gas generated by the reaction is discharged into the oxidation furnace 21; in addition, the circulating device 22 circulates the incombustible waste into the incombustible sorting apparatus 23, and the incombustible sorting apparatus 23 sorts and stores the incombustible waste. The gas generated by the reaction of the oxidation furnace 21 is discharged into the decomposing furnace 1 through a second pipeline 26, and a second adjusting control valve is arranged on the second pipeline 26 and can adjust and control the smoke quantity entering the decomposing furnace 1.
The decomposing furnace 1 is a TTF furnace, gas generated in the furnace is discharged into the dilution cooler 3, and the gas in the dilution cooler 3 passes through the cyclone separator 5, the chlorine removal equipment 6, the dust collector 7 and the induced draft fan 8 in sequence and is discharged into the air. A dilution blower 4 is connected to the dilution cooler 3 to facilitate gas discharge in the dilution cooler 3. The dust collector 7 adopts the film-coated filter bag, has small running resistance (can reduce about 800 Pa), reduces the wind pressure of the exhaust fan and reduces the power consumption in production. For a cement production line with a scale of 5500t/d, the electricity is saved by about 0.5 degree per ton of clinker.
It should be noted that the cyclone 5 is capable of separating solid particles or liquid droplets from the gas flow by centrifugal force.
The lower part of the decomposing furnace 1 is connected with a pulverized coal burner 2, and the burnt substances are discharged into a rotary kiln 9. The pulverized coal burner 2 is of a four-channel type, and has no abrasion in the use process and long service life; the thrust of the combustor is large and can reach more than 1500m/s, and the adaptability to various coal qualities is good.
The TTF furnace has the advantages of three-spouting and roof-collision effects, large solid-gas retention time ratio (Tm is 4-5), strong turbulent flow reflux effect, large solid-gas retention time ratio, uniform temperature field and concentration field, good material dispersion and heat exchange effects, simple furnace body structure and low resistance coefficient; compared with the pipeline type decomposing furnace 1, the TTF decomposing furnace 1 has lighter equipment weight under the condition of the same volume, and meanwhile, the volume efficiency of the decomposing furnace 1 is higher than that of a pipeline, so that the laminar flow phenomenon caused by a long pipeline is avoided;
the local high-temperature area in the middle of the combustion area of the decomposing furnace 1 can reach 1300 ℃, the local temperature of the decomposing furnace 1 can greatly improve the combustion effect of the pulverized coal, and the high-temperature area is designed for 1.5s, so that the inferior coal and the anthracite can be ensured to be fully combusted; the materials are placed right above the tertiary air and can be fully dispersed, the materials of the decomposing furnace 1 are uniformly distributed, the flow field is more reasonable, the cone-shaped material collapse can be reduced, the pressure loss of the decomposing furnace 1 can be greatly reduced, and the corresponding resistance of the system is reduced.
The system makes full use of the high temperature condition of the rotary kiln 9 and the decomposing furnace 1 above 850 ℃ to burn and decompose the flue gas of the garbage incinerator, the residence time of the flue gas in the decomposing furnace 1 reaches more than 4 seconds, thereby achieving the purpose of thoroughly decomposing organic matters in the garbage, greatly reducing the formation amount of harmful substances such as dioxin and the like, and being lower than the national standard requirement of the garbage incinerator for incinerating harmful substance emission.
In addition, basic components such as calcium oxide, calcium carbonate and the like in the raw material powder in the rotary kiln 9 system are fully utilized, SO that acid gas and substances generated by waste incineration are fully absorbed, washed and purified by the raw material powder, SO2, Cl and the like are fixed in the form of synthetic salts, and the re-synthesis of acid harmful gas and dioxin in flue gas after the waste incineration is greatly reduced.
In addition, the garbage transfer chamber 12 is arranged on one side of the garbage treatment chamber 10 through the sealed garbage treatment chamber 10, so that the overflowing of the peculiar smell gas of the garbage can be effectively prevented, the garbage treatment chamber 10 is also provided with a deodorization device 14, the peculiar smell in the garbage treatment chamber 10 is eliminated, and meanwhile, the part of gas is sent into the cement clinker cooler and enters the rotary kiln 9 and the decomposing furnace 1, so that the harmful gas is completely combusted.
In addition, nascent Ca0 is formed in the decomposition process of CaC03, and has high activation energy and strong reactivity. In the decomposing furnace 1, the decomposing rate of the materials entering the kiln is at least over 90 percent, and only a small amount of carbonate decomposing tasks are left to be completed in the kiln. The high-temperature zone in the furnace is only limited in the flame radiation section, and for the decomposing furnace 1 with the general length-diameter ratio L/D of 14-16, the materials which have completed the decomposition task need to stay in the transition zone at 900-1300 ℃ for too long time, generally 15-16 min, so that the material heating process is delayed. Therefore, the reactivity of Ca0 is not fully embodied, resulting in the growth of C2S and Ca0 minerals. Because the clinker is not heated rapidly by enough heat, the agglomeration and sintering of the clinker are restricted, and the structure of the clinker is poor. The system utilizes the smoke generated by the decomposition assisting mechanism to contain a large amount of heat, so that the decomposing furnace 1 can be rapidly heated, the granulation and sintering of clinker are promoted, and the sintering quality of the clinker is improved.
The above description is only a preferred embodiment of the present invention, and any person skilled in the art may modify the present invention or modify it into an equivalent technical solution by using the technical solution described above. Therefore, any simple modifications or equivalent substitutions made in accordance with the technical solution of the present invention are within the scope of the claims of the present invention.

Claims (8)

1. A dry cement preheating decomposition system is characterized in that: the device comprises a decomposing furnace (1), wherein a decomposition assisting mechanism is arranged on one side of the decomposing furnace (1), a pulverized coal burner (2) is arranged at the lower end of the decomposing furnace (1), a dilution cooler (3) is arranged on one side of the pulverized coal burner (2), a dilution air blower (4) is connected to one side of the dilution cooler (3), a cyclone separator (5) is connected to the upper end of the dilution cooler (3), a chlorine removal device (6) is connected to the upper end of the cyclone separator (5), a dust collector (7) is connected to one side of the chlorine removal device (6), and an induced draft fan (8) is connected to one side of the dust collector (7);
a rotary kiln (9) is also arranged on one side of the pulverized coal burner (2);
the decomposition assisting mechanism comprises a sealed garbage treatment chamber (10), a garbage unloading platform (11) is arranged on one side of the garbage treatment chamber (10), a garbage transfer chamber (12) is further arranged on one side of the garbage treatment chamber (10), a garbage carrying device (13) is arranged at the top of the garbage treatment chamber (10), a deodorizing device (14) is arranged on the other side of the garbage treatment chamber (10), a garbage pit I (15) and a garbage pit II (16) are arranged on one side of the bottom of the garbage treatment chamber (10), a garbage crusher (17) is arranged on the other side of the bottom of the garbage treatment chamber (10), the lower end of the garbage crusher (17) is connected with the garbage pit II (16), a garbage supply device (18) is further arranged on the other side of the bottom of the garbage treatment chamber (10), and an oxidizing furnace (21) is connected to the lower end of the garbage supply device (18) through a pipeline I (19), the lower extreme of oxidation furnace (21) is connected with circulating device (22), one side of circulating device (22) is connected with incombustible thing sorting facilities (23), one side of circulating device (22) still is connected with combustion-supporting equipment (24), one side of combustion-supporting equipment (24) with oxidation furnace (21) is connected, one side of oxidation furnace (21) is connected with air heater (25), the top of oxidation furnace (21) pass through pipeline two (26) with decomposing furnace (1) is connected.
2. The dry cement preheating decomposition system according to claim 1, characterized in that: the pulverized coal burner (2) comprises a four-layer air duct structure which is respectively a cooling air duct (201), an axial flow air duct (202), a coal air duct (203) and a rotational flow air duct (204) from outside to inside.
3. The dry cement preheating decomposition system according to claim 2, characterized in that: the air outlet of the axial flow air duct (202) is composed of 8 air ducts, cooling pipes are arranged between adjacent air ducts, and the air ducts and the cooling pipes are distributed in an annular direction.
4. The dry cement preheating decomposition system according to claim 2, characterized in that: the air outlet of the rotational flow air duct (204) is composed of 12 air ducts, cooling pipes are arranged between adjacent air ducts, the air ducts and the cooling pipes are distributed in an annular direction, and the rotational direction of the air outlet of the rotational flow air duct (204) is the same as that of the rotary kiln (9).
5. The dry cement preheating decomposition system according to claim 2, characterized in that: and a flame collecting cover (205) is arranged on the periphery of the cooling air duct (201).
6. The dry cement preheating decomposition system according to claim 1, characterized in that: the first pipeline (19) is provided with a first control regulating valve (20).
7. The dry cement preheating decomposition system according to claim 1, characterized in that: and the second pipeline (26) is provided with a second control regulating valve (27).
8. The dry cement preheating decomposition system according to claim 1, characterized in that: the decomposing furnace (1) is a TTF furnace.
CN202110752605.6A 2021-07-02 2021-07-02 Dry cement preheating decomposition system Pending CN113446608A (en)

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CN101786809A (en) * 2009-12-31 2010-07-28 安徽海螺建材设计研究院 Garbage disposal system used in cement dry kiln production and disposal method thereof
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Application publication date: 20210928