CN103253879B - Cement clinker production technology for enriching CO2 by use of O2/CO2 combustion technology - Google Patents
Cement clinker production technology for enriching CO2 by use of O2/CO2 combustion technology Download PDFInfo
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- CN103253879B CN103253879B CN201310164913.2A CN201310164913A CN103253879B CN 103253879 B CN103253879 B CN 103253879B CN 201310164913 A CN201310164913 A CN 201310164913A CN 103253879 B CN103253879 B CN 103253879B
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Abstract
The invention discloses a cement clinker production technology for enriching CO2 by use of an O2/CO2 combustion technology, belonging to the field of cement clinker production technology. In the cement clinker production technology, O2 separated from the air is mixed with a high-concentration CO2 circulating flue gas, and then the mixture is introduced into a decomposing furnace and a rotary kiln to realize O2/CO2 combustion; the kiln-tail flue gas after the coal powder combustion and clinker decomposition in the decomposing furnace and the rotary kiln is rich in CO2, and the concentration of CO2 in the kiln-tail flue gas exceeds 95%; after flue gas treatment, the concentration of CO2 in the kiln-tail flue gas exceeds 99%; the kiln-tail flue gas can be stored and recycled so as to realize enrichment and recovery of CO2 in a cement production process; and meanwhile, the reduction of CO2 emission is realized in the cement production technology.
Description
Technical field
The present invention relates to a kind of new cement clinker production technology method, particularly one adopts O
2/ CO
2combustion technology enrichment CO
2cement clinker production technology.
Background technology
Under the background that global climate warms gradually, various countries propose CO one after another
2emission reduction targets, low-carbon technology and green products exploitation be day by day subject to extensive concern both domestic and external.Cement industry, as the energy and the intensive industry of resource consumption, has become the second largest CO of industrial production after occupying thermal power generation
2emission source, realizes Cement industry CO
2reduction of discharging be a unavoidable strategic task.Under prior art level conditions, often produce the CO of 1 ton of cement discharge
2about amount is about 0.7-1.1 ton, wherein nearly half is from (the mainly CaCO of carbonate decomposition in raw material
3, MgCO
3deng decomposition), come from coal dust firing about second half.The CO discharged in cement production process
2the concentration of concentration ratio power plant emission is higher, makes Cement industry enrichment CO
2effectively control CO can be become
2potential approach.
Current cement production process generally adopts new dry process production technique, and it is primarily of equipment compositions such as decomposing furnace, mulitistage cyclone, rotary kiln, grate-cooler, cleaning apparatus, connection airducts.Raw material decompose in decomposing furnace, and part coal dust is in decomposing furnace combustion and supply raw material and decompose institute energy requirement; Raw material after decomposition enter in rotary kiln and are sintered into cement clinker by another part coal dust firing.The high-temperature gas that decomposing furnace is discharged passes into multistage preheater classification preheating material, and exit gas enters air through dedusting again.Because the gas passing into quality coal in cement kiln systems is air, its expellant gas CO
2concentration is about 30%.Flue gas CO conventional at present
2isolation technique mainly contains chemical absorption method, physical absorption method and membrane separation process technology etc.The pressure of usual flue gas is little, volume large, CO
2concentration is low, and containing a large amount of N
2, therefore trapping system is huge, needs to consume a large amount of energy.Therefore CO in cement production process
2process be one be worth research important topic.
Summary of the invention
For overcoming the shortcoming and defect of above-mentioned prior art, the object of the present invention is to provide a kind of employing O
2/ CO
2combustion technology enrichment CO
2cement clinker production technology.This production technique to be mixed with circulating flue gas by pure oxygen and passes into decomposing furnace and rotary kiln, forms O
2/ CO
2atmosphere, thus make the flue gas product of decomposing furnace and rotary kiln be high concentration CO
2, realize Cement industry enrichment CO
2so that recycling and sealing up for safekeeping.
Order of the present invention is realized by following process technology scheme: a kind of employing O
2/ CO
2combustion technology enrichment CO
2cement clinker production technology, mainly comprise technical process as shown in Figure 1:
By flow direction of material, raw meal powder feeds air lift mud pump by feeding machine, blasts air by blower fan, raw material are brought into five-stage whirlwind cylinder pre-heating by transport pipe, in cyclone cylinder, realize gas solid separation, enter decomposing furnace after raw material and air separation, in decomposing furnace, raw material are with O
2/ CO
2mixed airflow does swirling motion, decomposes in decomposing furnace, with pneumatic separation after enter rotary kiln, the grog burnt till enter grate-cooler cooling after draw off, obtain cement clinker;
O in cement clinker production process
2/ CO
2gas mixture is utilized by following step cycle: mixed O according to a certain percentage
2/ CO
2gas mixture passes into grate-cooler, is divided into three road gases, the O that first via temperature is lower after grog preheating
2/ CO
2gas mixture passes into fuel dryer and carries coal dust and enter decomposing furnace and rotary kiln; Second road high temperature O
2/ CO
2gas mixture directly enters rotary kiln as secondary air for kiln fuel combustion; The O that 3rd tunnel temperature is higher
2/ CO
2gas mixture is through the tertiary-air pipe of decomposing furnace, stove is mixed in the bottom of decomposing furnace and kiln gas, the coal dust carried with the first via gas sprayed in stove meets, for coal dust firing, raw material in stove are decomposed, then decomposition furnace outlet flue gas enters five-stage whirlwind cylinder pre-heating, from the CO of five-stage whirlwind cylinder pre-heating flue gas out
2concentration > 95%, pass into waste heat boiler and carry out warm-up power generation, then partial fume passes into raw material pulverizing mill and dries raw material, converge with other flue gases again and enter smoke processing system, in smoke processing system, first dedusting is carried out to flue gas, a flue gas part after dedusting carries out cooling de-watering technique and dry decontamination technique, obtains the CO being used for recycling
2the gas that concentration is greater than more than 99%, the O that the flue gas another part after dedusting is separated with from air as circulating flue gas
2carry out mixing as O
2/ CO
2gas mixture passes into grate-cooler and carries out recycle;
Described decomposition furnace outlet flue gas concentration is high concentration CO
2gas, CO
2concentration > 95%, CO after fume treatment
2concentration reaches more than 99%, can seal up for safekeeping or recycling;
In described decomposing furnace, during decomposes, the flue-gas temperature of decomposing furnace is 900 ~ 1000 DEG C;
Isolated O in described air
2preferably by air separation plant, acquisition O is separated to air handling
2;
Described mixed according to a certain percentage O
2/ CO
2o in gas mixture
2with CO
2ratio can calorific value coal-fired as required and decomposing furnace and the service temperature needed for rotary kiln regulate; O in mixed gas
2shared volume ratio is preferably 23% ~ 33%;
The O that described temperature is lower
2/ CO
2the preferable temperature of gas mixture is 180 ~ 220 DEG C;
The O that described temperature is higher
2/ CO
2the preferable temperature of gas mixture is 650 ~ 750 DEG C;
Described high temperature O
2/ CO
2the preferable temperature of gas mixture is 750 ~ 850 DEG C;
Described cooling de-watering technique is chosen as air cooling de-watering apparatus;
Described dry decontamination technique is chosen as air separation plant, carries out CO to flue gas
2purification.
Principle of the present invention is:
In technological process, will from air isolated O
2with high concentration CO
2circulating flue gas mixing after form O
2/ CO
2gas mixture, then by O
2/ CO
2gas mixture sends into decomposing furnace and rotary kiln, thus realizes the O of cement production process
2/ CO
2burning; Decomposing furnace atmosphere is the CO of high density
2flue gas, and the N in common process in decomposing furnace being high density
2, CO
2radiation capacity compare N
2radiation capacity be eager to excel, increase the radiation capacity of air-flow in decomposing furnace, enhance the heat transfer in stove, to the full furnace temperature of promotion evenly advantageously; Decomposition furnace outlet flue gas is high concentration CO
2flue gas, form above-mentioned high concentration CO through dedusting rear portion flue gas
2circulating flue gas, with O
2be mixed to form O
2/ CO
2gas mixture circulates; Another part flue gas then can be carried out recycling by cooling de-watering and dry decontamination or seal up for safekeeping, thus realizes CO in cement clinker production process
2enrichment and recovery.Therefore, the present invention proposes O
2/ CO
2combustion technology is applied to cement clinker and produces, and forms a kind of new O
2/ CO
2cement kiln production technique.
The present invention has following advantage and effect relative to prior art:
1, O is utilized
2/ CO
2combustion technology is to make the CO of exhaust for high density of cement kiln
2, realize the CO of Cement industry
2direct enrichment.
2, whole technical process can realize O in rotary kiln Sum decomposition stove
2/ CO
2oxygen-enriched combusting, the atmosphere in decomposing furnace and rotary kiln is the CO of high density
2flue gas, and the N in common process in decomposing furnace being high density
2, CO
2radiation capacity compare N
2radiation capacity be eager to excel, increase the radiation capacity of air-flow in decomposing furnace, enhance the heat transfer in stove, to the full furnace temperature of promotion evenly advantageously.
Accompanying drawing explanation
Fig. 1 adopts O
2/ CO
2combustion technology enrichment CO
2cement clinker production technology figure.
Fig. 2 adopts O
2/ CO
2combustion technology enrichment CO
2the process flow sheet of cement clinker.
Fig. 3 is the thermogravimetric test graphic representations of raw material in various atmosphere.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1
As shown in Figure 2, entering raw material pulverizing mill humidity is the raw material of about 8%, carries out heat exchange with the kiln exit gas of heat boiler outlet, and after heat exchange, raw material drying is humidity about 1%, and temperature is elevated to 90 ~ 110 DEG C, to raw material homogenizing; By lift, raw material are transported to five-stage whirlwind cylinder pre-heating, raw material can be preheated to 700 ~ 800 DEG C; Through the raw meal powder of preheating after decomposing furnace carries out predecomposition, become the ripe raw material of 850 ~ 950 DEG C, rotary kiln is entered by tremie pipe, then in rotary kiln, the grog of temperature 1200 ~ 1300 DEG C is become through high-temperature calcination, drop to grate-cooler through revolution kilneye to cool, by clinker cooling to about 90 ~ 100 DEG C.Five-stage whirlwind cylinder pre-heating kiln exit gas temperature is out about 300 ~ 400 DEG C, carries out waste gas residual heat generating at preheater kiln tail waste heat boiler, and to control its exiting flue gas be 140 ~ 150 DEG C; Heat boiler outlet flue gas is divided into two-way, and a road flue gas passes into cleaning apparatus again through the dry raw material of raw material pulverizing mill, and another road flue gas directly passes into cleaning apparatus and carries out dedusting; CO in flue gas after dedusting
2volume fraction > 95%, is further divided into two portions, and part of smoke directly carries out cooling and dewatering process, drying and purification process, obtains CO
2the gas that concentration is greater than more than 99%, then carries out recycling treatment or seals up for safekeeping; The O that another part flue gas is separated as circulating flue gas and air separation plant
2at the O of mixing tank mixing acquisition 60 ~ 80 DEG C
2/ CO
2gas mixture, introduces grate-cooler after mixing; Grate-cooler draws three road gases: first via gas is the O drawing temperature lower (180 ~ 220 DEG C) from grate-cooler
2/ CO
2gas mixture enters fuel dryer and carries coal dust and as the First air of system, the second road gas is the O drawing temperature higher (650 ~ 750 DEG C) from grate-cooler
2/ CO
2gas mixture enters the tertiary air of decomposing furnace by tertiary-air pipe, and the 3rd road gas is the O exported from grate-cooler gas (750 ~ 850 DEG C)
2/ CO
2gas mixture directly passes into the secondary air of rotary kiln.The flue-gas temperature of decomposing furnace is 900 ~ 1000 DEG C, is the middle and upper reaches temperature of conventional operating temperature, at O
2/ CO
2under atmosphere, raw material decomposition can be postponed, but rate of decomposition is accelerated, and applicant has carried out experimental study, finds at 100%CO
2under atmosphere, raw material at 947 DEG C of fast decoupleds, and can complete decomposition at 964 DEG C; At O
2/ CO
2when ratio is 30/70, its rate of decomposition is substantially identical with the rate of decomposition of air atmosphere.
Through above-mentioned employing O
2/ CO
2combustion technology enrichment CO
2cement clinker production technology technical scheme, make the exhaust of cement kiln be CO
2the gas of volume fraction > 95%, by obtaining CO after fume treatment
2the gas of volume fraction > 99%, realizes the CO of Cement industry
2enrichment and recycling.
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from spirit of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Embodiment 2
Adopt the resistance to STA409PC of the executing thermogravimetric analyzer of Germany to test Egyptian raw material, starting temperature is 40 DEG C, and end temp is 1000 DEG C, and heat-up rate is 20 DEG C/min, and raw meal quality is 10mg.Experiment shows (as Fig. 3 and table 1): under air atmosphere, and raw material just start to decompose at 755 DEG C, and reach maximum value at the rate of decomposition of 810 DEG C, just decompose end at 831 DEG C, the resolving time is 3.8min, and rate of decomposition reaches 33.14%; Work as O
2/ CO
2when concentration is 40/60, raw material start to decompose at 895 DEG C, reach maximum value at the rate of decomposition of 918 DEG C, and decompose at 941 DEG C and terminate, the resolving time is 2.3min, and rate of decomposition reaches 33.74%; Work as O
2/ CO
2when concentration is 30/70, raw material start to decompose at 912 DEG C, reach maximum at 928 DEG C of rate of decomposition, and decompose at 954 DEG C and terminate, the resolving time is 2.1min, and rate of decomposition reaches 32.37%; Work as O
2/ CO
2when concentration is 21/79, raw material start decomposition reaction occurs at 918 DEG C, reach rate of decomposition maximum at 942 DEG C, and decompose at 960 DEG C and terminate, the resolving time is 2.1min, and rate of decomposition reaches 31.29%; Work as O
2/ CO
2when concentration is 0/100, raw material start decomposition reaction occurs at 932 DEG C, reach rate of decomposition maximum at 947 DEG C, and decompose at 964 DEG C and terminate, the resolving time is 1.6min, and rate of decomposition reaches 31.24%.
Above data declaration, for normal atmosphere air, at O
2/ CO
2in atmosphere, raw material decompose start and end temp higher, the resolving time is shorter; At O
2/ CO
2in atmosphere, along with CO
2increasing of concentration, raw material decomposition starting temperature and end temp all increase, and the resolving time shortens, and rate of decomposition then reduces, but works as O
2/ CO
2ratio its rate of decomposition 30/70 time is substantially identical with the rate of decomposition of air atmosphere.CO
2concentration when being 100%, can decompose completely in 964 DEG C.
The thermogravimetric test result of table 1 raw material under different atmosphere
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from spirit of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (3)
1. one kind adopts O
2/ CO
2combustion technology enrichment CO
2cement clinker production technology, it is characterized in that: comprise following technical process: by flow direction of material, raw meal powder feeds air lift mud pump by feeding machine, air is blasted by blower fan, raw material are brought into five-stage whirlwind cylinder pre-heating by transport pipe, in cyclone cylinder, realize gas solid separation, enter decomposing furnace after raw material and air separation, in decomposing furnace, raw material are with O
2/ CO
2mixed airflow does swirling motion, decomposes in decomposing furnace, with pneumatic separation after enter rotary kiln, the grog burnt till enter grate-cooler cooling after draw off, obtain cement clinker;
O in cement clinker production process
2/ CO
2gas mixture is utilized by following step cycle: mixed O according to a certain percentage
2/ CO
2gas mixture passes into grate-cooler, is divided into three road gases, the O that first via temperature is lower after grog preheating
2/ CO
2gas mixture passes into fuel dryer and carries coal dust and enter decomposing furnace and rotary kiln; Second road high temperature O
2/ CO
2gas mixture directly enters rotary kiln as secondary air for kiln fuel combustion; The O that 3rd tunnel temperature is higher
2/ CO
2gas mixture is through the tertiary-air pipe of decomposing furnace, stove is mixed in the bottom of decomposing furnace and kiln gas, the coal dust carried with the first via gas sprayed in stove meets, for coal dust firing, raw material in stove are decomposed, then decomposition furnace outlet flue gas enters five-stage whirlwind cylinder pre-heating, from the CO of five-stage whirlwind cylinder pre-heating flue gas out
2concentration > 95%, passes into waste heat boiler and carries out warm-up power generation; Then, pass into raw material pulverizing mill from waste heat boiler partial fume out and dry raw material, enter smoke processing system with converging from waste heat boiler other flue gases out again, in smoke processing system, first dedusting is carried out to flue gas, a flue gas part after dedusting carries out cooling de-watering technique and dry decontamination technique, obtains the CO being used for recycling
2the gas that concentration is greater than more than 99%, the O that the flue gas another part after dedusting is separated with from air as circulating flue gas
2carry out mixing as O
2/ CO
2gas mixture passes into grate-cooler and carries out recycle;
Described decomposition furnace outlet flue gas concentration is high concentration CO
2gas, CO
2concentration > 95%, CO after fume treatment
2concentration reaches more than 99%, can seal up for safekeeping or recycling;
Described mixed according to a certain percentage O
2/ CO
2o in gas mixture
2shared volume ratio is 23% ~ 33%;
The O that described temperature is lower
2/ CO
2the temperature of gas mixture is 180 ~ 220 DEG C;
The O that described temperature is higher
2/ CO
2the temperature of gas mixture is 650 ~ 750 DEG C;
Described high temperature O
2/ CO
2the temperature of gas mixture is 750 ~ 850 DEG C.
2. employing O according to claim 1
2/ CO
2combustion technology enrichment CO
2cement clinker production technology, it is characterized in that: in described decomposing furnace, during decomposes, the flue-gas temperature of decomposing furnace is 900 ~ 1000 DEG C.
3. employing O according to claim 1
2/ CO
2combustion technology enrichment CO
2cement clinker production technology, it is characterized in that: isolated O in described air
2for being separated acquisition O by air separation plant to air handling
2.
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|---|---|---|---|
| CN201310164913.2A CN103253879B (en) | 2013-05-07 | 2013-05-07 | Cement clinker production technology for enriching CO2 by use of O2/CO2 combustion technology |
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|---|---|---|---|
| CN201310164913.2A CN103253879B (en) | 2013-05-07 | 2013-05-07 | Cement clinker production technology for enriching CO2 by use of O2/CO2 combustion technology |
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| CN103253879B true CN103253879B (en) | 2015-04-22 |
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| CN109813129B (en) * | 2019-01-04 | 2019-11-12 | 北京科技大学 | One kind being based on circulation of tail gas O2-CO2Combustion-supporting pelletizing production technique and preparation system |
| CN112390553B (en) * | 2019-08-12 | 2023-10-31 | 天津水泥工业设计研究院有限公司 | CO (carbon monoxide) realization method 2 Zero-emission cement kiln system and method for preparing cement clinker |
| CN112390551B (en) * | 2019-08-12 | 2023-07-25 | 天津水泥工业设计研究院有限公司 | Adjustable CO retrofitted from off-line decomposing furnace 2 Enriched cement kiln system and method |
| CN112654590B (en) * | 2019-08-12 | 2022-07-01 | 天津水泥工业设计研究院有限公司 | Cement kiln system capable of adjusting CO2 enrichment amount and improved by online decomposing furnace and using method thereof |
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| CN112321183B (en) * | 2020-11-12 | 2022-06-24 | 天津水泥工业设计研究院有限公司 | Cement kiln system for realizing zero emission of carbon dioxide and cement clinker preparation method |
| WO2022126410A1 (en) * | 2020-12-16 | 2022-06-23 | 天津水泥工业设计研究院有限公司 | Low-energy-consumption carbon-enriched cement production system and method for producing cement clinker |
| CN112984783A (en) * | 2021-02-05 | 2021-06-18 | 陕西翼飞航智能科技有限公司 | Based on CO2Cement production and CO production in plasma hot blast stove2Decomposed gas recovery system and method |
| CN113509834B (en) * | 2021-04-08 | 2023-02-14 | 华南理工大学 | Local calcium circulation and pure oxygen combustion coupled cement production carbon capture device and process |
| CN114195414A (en) * | 2022-01-05 | 2022-03-18 | 西南科技大学 | Carbon emission reduction method for production of cementing material |
| CN114459236A (en) * | 2022-01-29 | 2022-05-10 | 西南化工研究设计院有限公司 | Energy-saving cement kiln flue gas carbon capture method |
| CN114735956B (en) * | 2022-03-04 | 2023-12-29 | 华东理工大学 | Low-carbon production method and system for cement clinker |
| CN115159876B (en) * | 2022-06-29 | 2023-10-27 | 天津水泥工业设计研究院有限公司 | Low-energy-consumption carbon-trapping cement clinker production system and cement clinker preparation method |
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