CN203768248U - Clinker firing system by taking dried carbide slags as calcium raw material - Google Patents

Clinker firing system by taking dried carbide slags as calcium raw material Download PDF

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Publication number
CN203768248U
CN203768248U CN201420186113.0U CN201420186113U CN203768248U CN 203768248 U CN203768248 U CN 203768248U CN 201420186113 U CN201420186113 U CN 201420186113U CN 203768248 U CN203768248 U CN 203768248U
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China
Prior art keywords
raw material
decomposing furnace
calcium
heating system
carbide
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Expired - Fee Related
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CN201420186113.0U
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Chinese (zh)
Inventor
康宇
李安平
祁亚军
钟根
桑圣欢
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Nanjing Kisen International Engineering Co Ltd
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Nanjing Kisen International Engineering Co Ltd
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    • 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
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
    • 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
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
    • Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods

Abstract

The utility model discloses a clinker firing system by taking dried carbide slags as a calcium raw material. When a raw material for firing a cement clinker is prepared, all calcium raw materials in the raw material are dried carbide slag which is independently prepared and directly fed to a decomposing furnace and is decomposed in the decomposing furnace. Other raw materials are independently grinded to raw material powder and fed to a pre-heater system, the material preheated by the preheater system and the material obtained by decomposing carbide slags are mixed in the preheater system, and then, the mixture directly enters into a rotary kiln to be fired to the cement clinker. The system fully combines the characteristics of decomposition of carbide slags and synthesis of calcium carbonate, separates the carbide slag decomposing process from the non-calcium raw material preheating process and avoids calcium carbonate synthetic reaction of the main component of the carbide slags calcium hydroxide and carbon dioxide in smoke in the preheater system (to further avoid re-decomposition of calcium carbonate to consume more energies), so that energy conservation and consumption reduction of the firing system are realized.

Description

Grog firing system taking dry carbide slag as calcareous raw material
Technical field
The utility model relates to a kind of grog firing system, relates in particular to a kind of dry carbide slag completely for the grog firing system of Wingdale.
Background technology
Carbide slag is the industrial residue that Coal Chemical Industry industry acetylene method is produced the resin such as PVC, PVA, and main component is Ca (OH) 2in production process, have dry row and two kinds of discharging modes of wet row, wet discharging carbide slag slag water ratio is 90 ~ 92%, and dry discharging carbide slag slag water ratio is generally 4% ~ 12%, CaO content very high (more than 60%) in carbide slag is the high-quality calcareous raw material that Cement industry replace lime stone is produced cement clinker.Dry discharging carbide slag pulp water divides low, generally can realize oven dry with kiln hood waste gas, can avoid again Ca (OH) 2with CO 2synthetic.
Main component Ca (OH) in carbide slag 2decomposition temperature and CaCO 3difference, carbide slag decomposition temperature is lower, Ca in carbide slag (OH) 2decomposition temperature 560 DEG C of left and right, lower than CaCO 3decomposition temperature, Ca (OH) 2divide heat of desorption also lower than CaCO 3.With carbide slag replace lime stone production cement clinker, successively experience the long kiln of wet method, shaft kiln, semi-wet method material cake and entered the kinds of processes such as kiln, lepol kiln, five-stage cyclone preheater kiln, new dry process rotary kiln, wherein new dry process rotary kiln Technology advanced person the most.Particularly, along with the technical progress of petrochemical industry, dry discharging carbide slag slag increases gradually, and new dry process rotary kiln Technology demonstrates advantage more.
Carbide slag main component Ca (OH) 2just start above to decompose at 450 DEG C, to 650 DEG C of basic decomposition completely, but carbide slag runs into and contains CO between 450-650 DEG C 2flue gas can synthesize CaCO 3.
CN101265041B discloses " dry discharging carbide slag slag 100% substitutes natural limestone raw material and produces cement clinker processing method ", to after sandstone, flyash, sulfate slag grinding, mix with calcium carbide ground-slag, after feeding three grades of preheater heat exchange, enter decomposing furnace decomposition, then enter rotary kiln calcination of cement clinker.There is Ca (OH) in the method 2with CO 2synthetic CaCO 3reaction problem, because heat-exchange temperature in three grades of preheaters is about 550 DEG C, i.e. Ca (OH) 2with CO 2when lower than 650 DEG C, can synthesize CaCO 3, the CaCO of generation 3in decomposing furnace, to experience again CaCO 3decompose, and CaCO 3decomposition temperature than Ca (OH) 2height, decomposing furnace pre-heating system completes CaCO3 decomposition by consuming higher hear rate.
But calcareous raw material be all carbide slag substitute time, according to the resolution characteristic of Ca (OH) 2 and the energy saving of quality coal in cement kiln systems, the decomposition furnace outlet temperature of quality coal in cement kiln systems only need be controlled at the 700-750 DEG C of decomposition that can meet Ca (OH) 2.Aforesaid method synthetic CaCO3 and dry carbide slag in preheater mixes, calciner temperature must meet CaCO3 (more than 850 DEG C) and decompose and could realize calcareous raw material and decompose comparatively thoroughly, will be in decomposing furnace many consume fuel, thereby cause firing system hear rate to increase.
Utility model content
Provide a kind of dry carbide slag calcining cement clinker system of avoiding carbide slag and carbonic acid gas synthetic calcium carbonate for above problem the utility model.
Provide and comprised tertiary-air pipe, rotary kiln, decomposing furnace, pre-heating system in order to overcome the above problems the utility model, tertiary-air pipe is connected with decomposing furnace, it is characterized in that: decomposing furnace is provided with the direct feeding mouth of dry calcium carbide ground-slag, pre-heating system is provided with raw meal powder feeding mouth, decomposing furnace communicates by pipeline with pre-heating system, and pre-heating system is connected by airduct with rotary kiln.
While preparing the raw material of calcining cement clinker, in raw material, calcareous raw material all uses dry calcium carbide ground-slag, and dry calcium carbide ground-slag is prepared separately also directly feeding decomposing furnace, completes decomposition in decomposing furnace; Other raw material separate grinding becomes raw material powder and feeds in pre-heating system, and the material after the material of pre-heating system preheating decomposes with calcium carbide ground-slag mixes in pre-heating system, then directly enters and in rotary kiln, is fired into cement clinker.
As a kind of improvement of the present utility model, the tremie pipe of pre-heating system is not all connected with decomposing furnace, and last step tremie pipe is directly connected with rotary kiln.The tremie pipe of pre-heating system is not all connected with decomposing furnace, and last step tremie pipe is directly connected with rotary kiln, has avoided other not need the material decomposing to enter decomposing furnace and affect the decomposition of dry carbide slag.In decomposing furnace, only have a kind of material of dry carbide slag, outlet spent air temperture is controlled at 700 DEG C can meet dry carbide slag decomposition above.
As a kind of improvement of the present utility model, rotary kiln is connected by airduct with pre-heating system.A part for rotary kiln exit gas directly passes into pre-heating system, or pass into pre-heating system after mixing with decomposition furnace outlet Gas phase Smoke, by by the shunting of high-temperature flue gas lower rotary kiln oxygen concentration, both can improve mixed flue gas oxygen level (per-cent) in decomposing furnace, be convenient to the burning of decomposing furnace fuel, can improve again the preheating temperature of pre-heating system, and then improve the temperature of charge into rotary kiln.
Beneficial effect:
The utility model system is fully decomposed and the characteristic of synthetic calcium carbonate in conjunction with carbide slag material, dry calcium carbide ground-slag directly feeds in 700 DEG C of above decomposing furnaces, its main component calcium hydroxide is decomposed into calcium oxide and vaporous water in decomposing furnace, avoids the carbonic acid gas synthetic calcium carbonate (avoiding calcium carbonate again to decompose and many consumed energies) in pre-heating system in main component calcium hydroxide and the flue gas of carbide slag.
Calcareous raw material is decomposed the utility model system and non-calcareous raw material preheating is separately carried out under differing temps, is conducive to reduce system energy consumption, also alleviated the load of decomposing furnace, can effectively save heat size, reduces cost of investment.
Brief description of the drawings
Fig. 1 is process flow sheet of the present utility model.
Fig. 2 is improvement process flow sheet of the present utility model.
In its Fig. 1,2,1 is that tertiary-air pipe, 2 is that rotary kiln, 3 is that decomposing furnace, 4 is pre-heating system.
Embodiment
For further understanding content of the present utility model, illustrate preferred embodiment of the present utility model with reference to Fig. 1,2.
As Fig. 1, grog firing system taking dry carbide slag as calcareous raw material, comprise tertiary-air pipe 1, rotary kiln 2, decomposing furnace 3, pre-heating system 4, while preparing the raw material of calcining cement clinker, in raw material, calcareous raw material all uses dry calcium carbide ground-slag, dry calcium carbide ground-slag separately preparation also directly feeds decomposing furnace 3, in decomposing furnace 3, completes decomposition; Other raw material separate grinding becomes raw material powder and feeds in pre-heating system 4, and the material after the material of pre-heating system 4 preheatings decomposes with calcium carbide ground-slag mixes in pre-heating system 4, then directly enters in rotary kiln 2 and is fired into cement clinker.
On the basis of above embodiment, the tremie pipe of pre-heating system 4 is not all connected with decomposing furnace, and last step tremie pipe is directly connected with kiln tail, carries out that calcareous raw material decomposes in decomposing furnace 3, non-calcareous raw material is in pre-heating system 4 preheatings.Decomposing furnace 3 exports spent air temperture and is controlled at more than 700 DEG C, can meet the decomposition of dry carbide slag.
In above embodiment, more much lower than the decomposing furnace flue-gas temperature of traditional new dry process firing system (more than 850 DEG C) owing to going out the flue-gas temperature of decomposing furnace 3, going out the temperature of charge that preheater enters rotary kiln 2 also reduces, corresponding some heats that will increase in rotary kiln 2 are realized the heating into kiln material, can slightly increase kiln hood firing rate, in kiln, exhausted air quantity can suitably increase.Because the burden of decomposing furnace alleviates much, tertiary air quantity and exhaust gas volumn are corresponding to be reduced.Conversion by embodiment can regulate this operating mode, as Fig. 2, can be by the part shunting in kiln exit gas, directly pass into pre-heating system 4, or export after Gas phase Smoke mixes and pass into pre-heating system 4 with decomposing furnace 3, both improve oxygen level in decomposing furnace 3 (per-cent), be convenient to the burning of decomposing furnace 3 fuels, improve again the preheating temperature of pre-heating system 4, and then improved the temperature of charge into rotary kiln 2.
The utility model can also have other embodiment, and the technical scheme that the mode of the equal replacement of all employings or equivalent transformation forms, all drops in protection domain of the present utility model.

Claims (3)

1. the grog firing system taking dry carbide slag as calcareous raw material, comprise tertiary-air pipe (1), rotary kiln (2), decomposing furnace (3), pre-heating system (4), tertiary-air pipe (1) is connected with decomposing furnace (3), it is characterized in that: decomposing furnace (3) is provided with the direct feeding mouth of dry calcium carbide ground-slag, pre-heating system (4) is provided with raw meal powder feeding mouth, decomposing furnace (3) communicates by pipeline with pre-heating system (4), and pre-heating system (4) communicates by pipeline with rotary kiln (2).
2. the grog firing system taking dry carbide slag as calcareous raw material according to claim 1, is characterized in that: the tremie pipe of pre-heating system (4) is not all connected with decomposing furnace (3), and last step tremie pipe is directly connected with rotary kiln.
3. the grog firing system taking dry carbide slag as calcareous raw material according to claim 1, is characterized in that: rotary kiln (2) is connected by airduct with pre-heating system (4).
CN201420186113.0U 2014-04-16 2014-04-16 Clinker firing system by taking dried carbide slags as calcium raw material Expired - Fee Related CN203768248U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420186113.0U CN203768248U (en) 2014-04-16 2014-04-16 Clinker firing system by taking dried carbide slags as calcium raw material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420186113.0U CN203768248U (en) 2014-04-16 2014-04-16 Clinker firing system by taking dried carbide slags as calcium raw material

Publications (1)

Publication Number Publication Date
CN203768248U true CN203768248U (en) 2014-08-13

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Country Status (1)

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20140813

Termination date: 20160416

CF01 Termination of patent right due to non-payment of annual fee