CN103922623B - The sinter leaching system being calcareous raw material with dry carbide slag - Google Patents
The sinter leaching system being calcareous raw material with dry carbide slag Download PDFInfo
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- CN103922623B CN103922623B CN201410153762.5A CN201410153762A CN103922623B CN 103922623 B CN103922623 B CN 103922623B CN 201410153762 A CN201410153762 A CN 201410153762A CN 103922623 B CN103922623 B CN 103922623B
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- raw material
- slag
- heating system
- decomposing furnace
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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
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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
- Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods
Abstract
The invention discloses a kind of sinter leaching system being calcareous raw material with dry carbide slag, comprise tertiary-air pipe, rotary kiln etc., when 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 is prepared separately and directly feeds decomposing furnace, in decomposing furnace, complete decomposition; 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 in rotary kiln and is fired into cement clinker.This system is fully in conjunction with the characteristic that carbide slag material decomposes and calcium carbonate synthesizes, non-to carbide slag decomposition course and other calcareous raw material warm is separated, avoid the generation calcium carbonate building-up reactions (and then avoid calcium carbonate again decompose and many consumed energy) of the carbonic acid gas in the main component calcium hydroxide of carbide slag and flue gas in pre-heating system, thus achieve the energy-saving and cost-reducing of firing system.
Description
Technical field
The present invention relates to a kind of sinter leaching system, particularly relate to a kind of dry carbide slag completely for the sinter leaching system of Wingdale.
Background technology
Carbide slag is the industrial residue that coal chemical industry acetylene method produces the resins such as PVC, PVA, and main component is Ca (OH)
2have dry row and wet row two kinds of discharging modes in production process, 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 substitutes that Wingdale produces cement clinker.Dry discharging carbide slag pulp water divides low, generally can realize drying with kiln hood waste gas, can avoid again Ca (OH)
2with CO
2synthesis.
Main component Ca (OH) in carbide slag
2decomposition temperature and CaCO
3difference, carbide slag decomposition temperature is lower, Ca (OH) in carbide slag
2decomposition temperature at about 560 DEG C, lower than CaCO
3decomposition temperature, Ca (OH)
2divide heat of desorption also lower than CaCO
3.Substitute Wingdale with carbide slag and produce cement clinker, successively experienced by the long kiln of wet method, shaft kiln, semi-wet method material cake enter 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 is the most advanced.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 to decompose more than 450 DEG C, substantially decompose completely to 650 DEG C, but carbide slag runs into containing 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 ", mix after sandstone, flyash, sulfate slag grinding with calcium carbide ground-slag, enter decomposing furnace after feeding three grades of preheater heat exchange to decompose, then enter rotary kiln calcination of cement clinker.There is Ca (OH) in the method
2with CO
2synthesis CaCO
3reaction problem, because in three grades of preheaters, heat-exchange temperature is about 550 DEG C, i.e. Ca (OH)
2with CO
2can CaCO be synthesized lower than when 650 DEG C
3, the CaCO of generation
3caCO to be experienced again in decomposing furnace
3decompose, and CaCO
3decomposition temperature than Ca (OH)
2height, the higher hear rate of consumption is completed CaCO3 and decomposes by decomposing furnace pre-heating system.
But calcareous raw material is all carbide slag when substituting, and 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 control the decomposition that can meet Ca (OH) 2 at 700-750 DEG C.The CaCO3 that aforesaid method synthesizes in preheater and dry carbide slag mix, calciner temperature must meet CaCO3 (more than 850 DEG C) and decompose and could realize calcareous raw material and decompose comparatively thoroughly, will in decomposing furnace many consume fuel, thus cause firing system hear rate to increase.
Summary of the invention
A kind of dry carbide slag calcining cement clinker system avoiding carbide slag and carbonic acid gas synthetic calcium carbonate is the invention provides for above problem.
A kind of sinter leaching system being calcareous raw material with dry carbide slag is the invention provides in order to overcome the above problems, comprise tertiary-air pipe, rotary kiln, decomposing furnace, pre-heating system, it is characterized in that: when 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 is prepared separately and directly feeds decomposing furnace, in decomposing furnace, complete decomposition; 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 in rotary kiln and is fired into cement clinker.
As a modification of the present invention, 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, and avoiding other does not need the material decomposed enter decomposing furnace and affect the decomposition of dry carbide slag.Only have a kind of material of dry carbide slag in decomposing furnace, outlet exhaust temperature controls to meet dry carbide slag more than 700 DEG C and decomposes.
As a modification of the present invention, 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 the shunting by high-temperature flue gas lower for rotary kiln oxygen concentration, both mixed flue gas oxygen level (per-cent) in decomposing furnace can have been improved, be convenient to the burning of decomposing furnace fuel, the preheating temperature of pre-heating system can be improved again, and then improve the temperature of charge into rotary kiln
Beneficial effect:
Present system fully decomposes and the characteristic of synthetic calcium carbonate in conjunction with carbide slag material, dry calcium carbide ground-slag directly feeds in the decomposing furnace of more than 700 DEG C, its main component calcium hydroxide is decomposed into calcium oxide and vaporous water in decomposing furnace, avoids the synthetic calcium carbonate (avoiding calcium carbonate again to decompose and many consumed energies) in pre-heating system of the carbonic acid gas in the main component calcium hydroxide of carbide slag and flue gas.
Present system is decomposed by calcareous raw material and non-calcareous raw material preheating is separately carried out at different temperatures, is conducive to reducing system energy consumption, also mitigates the load of decomposing furnace, effectively can save heat size, reduce cost of investment.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Fig. 2 is improving technique schema of the present invention.
In its Fig. 1,2,1 be tertiary-air pipe, 2 be rotary kiln, 3 be decomposing furnace, 4 for pre-heating system.
Embodiment
For content of the present invention can be understood further, illustrate the preferred embodiments of the present invention with reference to Fig. 1,2.
As Fig. 1, the sinter leaching system being calcareous raw material with dry carbide slag, comprise tertiary-air pipe 1, rotary kiln 2, decomposing furnace 3, pre-heating system 4, when 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 is prepared separately and is directly fed decomposing furnace 3, in decomposing furnace 3, complete 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 preheating 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 preheating.Decomposing furnace 3 outlet exhaust temperature controls, more than 700 DEG C, can meet the decomposition of dry carbide slag.
In above embodiment, because the flue-gas temperature going out decomposing furnace 3 is more much lower than the decomposing furnace flue-gas temperature (more than 850 DEG C) of traditional new dry process firing system, go out the temperature of charge that preheater enters rotary kiln 2 also to reduce, the corresponding heating that will increase some heats to realize into kiln material in rotary kiln 2, can slightly increase kiln hood firing rate, in kiln, exhausted air quantity can suitably increase.Burden due to decomposing furnace alleviates much, tertiary air quantity reduction corresponding to exhaust gas volumn.Can be regulated this operating mode by the conversion of embodiment, as Fig. 2, can by the part shunting in kiln exit gas, directly pass into pre-heating system 4, or pass into pre-heating system 4 after mixing mutually with decomposing furnace 3 exiting flue gas, both improve oxygen level (per-cent) in decomposing furnace 3, be convenient to the burning of decomposing furnace 3 fuel, turn improve the preheating temperature of pre-heating system 4, and then improve the temperature of charge into rotary kiln 2.
The present invention can also have other embodiment, and the technical scheme that all employings are replaced on an equal basis or the mode of equivalent transformation is formed, all drops in protection scope of the present invention.
Claims (3)
1. with the sinter leaching system that dry carbide slag is calcareous raw material, comprise tertiary-air pipe (1), rotary kiln (2), decomposing furnace (3), pre-heating system (4), it is characterized in that: when 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 is prepared separately and is directly fed decomposing furnace (3), in decomposing furnace (3), complete decomposition; Other raw material separate grinding becomes raw material powder and feeds in pre-heating system (4), material after the material of pre-heating system (4) preheating 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; A part for rotary kiln (2) kiln exit gas directly passes into pre-heating system (4) or passes into pre-heating system (4) after mixing mutually with decomposing furnace (3) exiting flue gas.
2. the sinter leaching system that is calcareous raw material with dry carbide slag according to claim 1, is characterized in that: the tremie pipe of pre-heating system (4) is not all connected with decomposing furnace, and last step tremie pipe is directly connected with rotary kiln.
3. the sinter leaching system that is calcareous raw material with dry carbide slag according to claim 1, is characterized in that: decomposing furnace (3) outlet exhaust temperature controls more than 700 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410153762.5A CN103922623B (en) | 2014-04-16 | 2014-04-16 | The sinter leaching system being calcareous raw material with dry carbide slag |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410153762.5A CN103922623B (en) | 2014-04-16 | 2014-04-16 | The sinter leaching system being calcareous raw material with dry carbide slag |
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| Publication Number | Publication Date |
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| CN103922623A CN103922623A (en) | 2014-07-16 |
| CN103922623B true CN103922623B (en) | 2015-08-05 |
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| CN105585263B (en) * | 2015-12-23 | 2018-01-16 | 中国建筑材料科学研究总院 | The preparation method of clinker |
| CN113816412A (en) * | 2021-10-27 | 2021-12-21 | 新疆凯盛建材设计研究院（有限公司） | Method for firing calcium oxide by carbide slag |
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| JP4901274B2 (en) * | 2006-04-07 | 2012-03-21 | 太平洋セメント株式会社 | Method for producing fired product |
| CN102114387B (en) * | 2010-12-22 | 2012-10-10 | 浙江工商大学 | Process for preventing cement clinker produced from high-sulfur raw material from skinning |
| CN102173608A (en) * | 2011-01-31 | 2011-09-07 | 新疆凯盛建材设计研究院（有限公司） | Method for preparing cement clinker from high-proportion carbide slag through decomposition outside kiln of five-stage preheater |
| CN202511622U (en) * | 2012-02-16 | 2012-10-31 | 合肥水泥研究设计院 | Device using carbide slag to manufacture cement |
| CN202648402U (en) * | 2012-03-30 | 2013-01-02 | 新疆天业（集团）有限公司 | Device for calcining portland cement clinker by using high chlorine ion residue raw material |
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Address after: 303 Hanzhongmen street, Gulou District, Nanjing City, Jiangsu Province Patentee after: Zhongcai International Intelligent Technology Co.,Ltd. Address before: 303 Hanzhongmen street, Gulou District, Nanjing City, Jiangsu Province Patentee before: NANJING KISEN INTERNATIONAL ENGINEERING Co.,Ltd. |
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