CN103755171A - Coal gangue activation process adopting synergism of pre-decomposition kiln - Google Patents
Coal gangue activation process adopting synergism of pre-decomposition kiln Download PDFInfo
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- CN103755171A CN103755171A CN201410012646.1A CN201410012646A CN103755171A CN 103755171 A CN103755171 A CN 103755171A CN 201410012646 A CN201410012646 A CN 201410012646A CN 103755171 A CN103755171 A CN 103755171A
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Abstract
The invention discloses a coal gangue activation process adopting synergism of a pre-decomposition kiln. The coal gangue activation process is performed by use of a crushing system, a raw material grinder, a cyclone separator, a conveying device, a lifter, a black coal gangue powder storehouse, a rotary kiln, an activating furnace, a material cooling and air preheating system, a high-efficiency separator, a preheater, an afterheat boiler, a dust collection system, a pneumatic transmission pump and a finished product storehouse. The performances of the coal gangue are activated by utilizing the synergism of a large Portland cement clinker production line in China at present; by optimizing and controlling various technological parameters in the activation, the activity of the black coal gangue is farthest improved; therefore a high-quality mixed material is provided for production of cement and concrete, and the combustion heat of the black coal gangue is also fully utilized to increase the electric energy production of the clinkers, thereby really making the best use of everything.
Description
Technical field
The present invention relates to activating coal gangue technical field, especially a kind of nsp kiln is worked in coordination with activating coal gangue technique.
Background technology
Coal is the topmost energy of China, its resource is very abundant, 2008 annual production surpass 27.16 hundred million tons, and coal gangue is a kind of solid waste producing in process of coal mining, along with the continuous expansion of coal production, the generation of coal gangue grows with each passing day, coal gangue generation is by 15% of raw coal output, and annual coal gangue at least increases by 1.8 hundred million tons, accumulates over the years the coal gangue that gets off over 2,700,000,000 tons, take up an area more than 300,000 mu, and quantity is still continuing increase.A large amount of coal gangues has seriously polluted environment, and has occupied a large amount of soils and farmland, has destroyed land resources. and if it effectively not utilized, will have a strong impact on the normal development of China coal industry, affect surrounding environment quality.Though coal gangue is a kind of solid waste, as long as it is carried out to reasonable use is also a kind of resource, can makes material of construction and low calorie fuels and use.
China is whole world manufacture of cement the first big country, a large amount of energy and resource in the production process of cement, have been consumed, also a large amount of non-renewable natural mineral resources have been consumed simultaneously, as Wingdale, clay, coal etc., how to widen the use range of mixing material, increase the addition content of mixing material in cement, reduce the consumption of grog, thereby economize on resources and the consumption of the energy, alleviate the pollution of ecotope significant.
Coal gangue, in the production of cement utilizes, adopts " two new technology of mixing " conventionally, i.e. equal admixture coal gangue in raw material and cement, for unburned coal gangue, proportioning in raw material is generally 3～7%, when addition content is too high, easily causes decline and the precalcining system Coating clogging of clinker quality; In cement as mixing material and the coal gangue of admixture, normally pass through spontaneous firing, or other modes were calcined and loss on ignition is qualified, because self-igniting coal gangue activity is lower, improve its volume in cement very difficult (general addition content 12～15%), improve the addition content of coal gangue in cement, just must improve the activity of coal gangue.
At present, China's cement industry market competition is day by day fierce, most cement production enterprises are in meagre profit lossing state even, the technology of using in New type coal spoil activation system is by the calcination activation to coal industry waste-black coal spoil or coal slime, the major ingredient of coal slime is black coal spoil, can provide a large amount of high-quality high reactivity cement additives for manufacture of cement, can make full use of again heat that black coal spoil contains for cogeneration, can produce considerable economic benefit for cement production enterprise, also the recycling for the waste that produces in coal production process contributes.
Cement industry is the industrial sector of a large amount of consumption of raw material and the energy, according to National Sustainable Development Strategies, present stage, the developing goal of Cement industry was to realize greenization and high performance, and emphasis is to economize on resources and the energy, and one of important measures are exactly to utilize in a large number industrial residue for manufacture of cement.Coal gangue is the industrial residue that current quantity discharged is maximum, utilization ratio is minimum, and causing major cause that utilization ratio is not high is that the pozzolanic activity of natural gangue is too low, therefore, improve black coal gangue utilization rate, and most important measure improves its pozzolanic activity exactly.
Application number is that 200820209744.4 patent document has been announced a kind of kiln for activating coal gangues, bulky, and body of heater and auxiliary building are built complicated, cost is high, the smoke contamination producing during coal gangue burning is serious, and coal gangue temperature of combustion is uncontrollable, affects coal gangue material activity.
Now invent the collaborative activating coal gangue technique of a kind of nsp kiln, utilize current Chinese large-sized Portland clinker production line to work in coordination with black coal spoil is carried out to performance activation, by optimizing and controlling the various process parameters in reactivation process, improve to greatest extent the activity of black coal spoil, for cement and concrete production provide high-quality mixing material.
Summary of the invention
The object of the invention is in order to overcome deficiency of the prior art, provide a kind of nsp kiln to work in coordination with activating coal gangue technique, utilize current Chinese large-sized Portland clinker production line to work in coordination with coal gangue is carried out to performance activation, by optimizing and controlling the various process parameters in reactivation process, improve to greatest extent the activity of black coal spoil, for cement and concrete production provide high-quality mixing material.
The present invention to achieve these goals, adopts following technical scheme: a kind of nsp kiln is worked in coordination with activating coal gangue technique, is by crushing system, raw material grinding mill, cyclone cylinder separator, e Foerderanlage, lift, black colliery powder storehouse, rotary kiln, activation furnace, the cooling and air preheating system of material, efficient cyclone, preheater, waste heat boiler, dust collecting system, Pneumatic conveying pump, stockyard forms; It is characterized in that: black coal spoil is in crushing system after fragmentation, in feeding raw material grinding mill, carry out grinding, after the separation of cyclone cylinder separator material gas, entering black coal spoil powder storehouse stores, black colliery powder feeding activation furnace carries out calcining and activating, after black colliery powder activation, become activated coal gangue powder, enter material gas separation in efficient cyclone, isolated hot flue gas is for cogeneration, activated coal gangue powder is cooling in cooling and air preheating system at material, finished product is delivered to stockyard and stores.
Black coal spoil is fractured into particulate in crushing system, feeding raw material grinding mill, in raw material grinding mill, by grinding, being become fineness is that 0.08mm square hole sieve tails over the black coal spoil fine powder that is not more than 8%, levigate black colliery powder enters cyclone cylinder separator with the outlet that the air-flow from waste heat boiler mixes through raw material grinding mill, isolated flue gas enter dust collecting system process after discharge, isolated black colliery powder feeds in black colliery powder storehouse and stores through e Foerderanlage and lift.
Black colliery powder in black colliery powder storehouse, after measuring apparatus metering, feeds activation furnace continuously by e Foerderanlage and lift; From the smoke-box of rotary kiln, drawing 5-10% temperature is that the kiln tail gas of 1050-1200 ℃ enters activation furnace; Air enters in the cooling and air preheating system of material and is preheating to after 450-550 ℃, enters activation furnace; In activation furnace, the high temperature hot gas body of black colliery powder and 1050-1200 ℃ of kiln tail gas from below to up, 450-550 ℃ carries out heat exchange, make black coal spoil pruinescence rapid heating, by regulating air capacity and feeding capacity, the temperature of black colliery powder is controlled to 850 ℃, after the decarburization of black colliery powder fast decoupled, dehydration, generates unbodied Al
2o
3, SiO
2, carry out series of physical chemical process simultaneously and be activated, after black colliery powder is activated, become activated coal gangue powder, granularity is less than 45um.
Activated coal gangue powder after activation enters efficient cyclone in company with air-flow and expects that gas is separated, separation efficiency is 92-97%, isolated flue-gas temperature is 750-900 ℃, the waste gas that is 300-350 ℃ with temperature from preheater is mixed into waste heat boiler, the steam that waste heat boiler produces is for cogeneration, the part of smoke that goes out waste heat boiler enters dust collecting system, after processing, dust collecting system discharges, another part flue gas is transported to raw material grinding mill through pipeline, waste heat boiler rear remaining material recycle separated with waste gas.
The isolated activated coal gangue powder of efficient cyclone enters material cold burden and air preheating system, the activated coal gangue powder of high temperature makes air be heated to rapidly 450-550 ℃, active coal gangue pruinescence fast cooling is cooled to 100-120 ℃, high-temperature hot air enters activation furnace, cooling activated coal gangue powder is through the air conveying stockyard that is pumped into, and store after being further cooled to 60-80 ℃, for cement or concrete production.
The invention has the beneficial effects as follows: utilize the existing limestone crushing system of cement clinker production line and raw material preparation system, respectively black coal spoil is carried out to fragmentation, grinding, after grinding, black coal spoil powder fineness reaches more than 0.08mm square hole sieve and is not more than 8%, one circle storehouse is set, for storing black colliery powder.
Formulate the best thermal regulation of black activating coal gangue, the best thermal regulation of black activating coal gangue is to burn soon chilling 850 ℃ of left and right, under the prerequisite that guarantees to dewater completely, heating gradient is higher, soaking time is shorter, and speed of cooling is faster, and the pozzolanic activity of activated coal gangue powder is higher; This just requires: the hot blast from kiln tail is controlled at 5 ﹪～8 ﹪, is generally no more than 10%; Preheated air cooling from material and air preheating system is 450-550 ℃, provides black gangue decarburization required oxygen; Temperature from kiln tail hot blast is 1050～1200 ℃, and both are mixed in proportion approximately 700 ℃ of rear temperature, can guarantee carbon burning contained in black coal spoil burning completely; Carbon burning meeting in black coal spoil makes the temperature rising Bing in activation furnace remain on 850 ℃, and too high temperature will reduce Al
2o
3, SiO
2activity.After black colliery powder activation, have the advantages that specific surface area is large, defect is many, activity is high.Activated coal gangue powder after chilling is sent into activated coal gangue powder stockyard by Pneumatic conveyer.Activated coal gangue powder is used as high activated admixture, and goes out that cement grinding mill cement is arranged in pairs or groups in proportion, is finished cement after homogenizing; Or for concrete production.
Mixing of kiln ash, has the effect of alkali-activator, has improved to a certain extent the activity of activated coal gangue powder, and has an optimum value; The present invention is very effective for the Coating clogging of alleviating precalcining system, is conducive to produce low-alkali clinker; Performance and the GBFS of kiln ash activated coal gangue powder are close, than natural gangue active, obviously improve, and be a kind of well behaved active addition, in complex cement, addition content can be up to 35～50%.
The activated coal gangue powder that the present invention produces, its granularity < 45um, without grinding, and goes out to grind that cement is arranged in pairs or groups in proportion, is finished cement after homogenizing, and power savings is remarkable; Owing to going out the hot blast temperature higher (more than 800 ℃) of efficient cyclone, after mixing with the waste gas (approximately 310 ℃) that goes out preheater, temperature is 365 ℃, be equivalent to temperature and improved 55 ℃, increased substantially the utilising efficiency of waste heat, 1 ton of grog can increase generated energy 10KWh newly; Utilize a small amount of waste heat of kiln tail and kiln ash that black coal spoil is dewatered, activated, both improved to greatest extent the activity after black activating coal gangue, make full use of again the generated energy that the black coal spoil combustion heat improves grog, really accomplish to make the best use of everything.
It is useful that the present invention produces grog, can effectively reduce the internal circulating load of the objectionable impuritiess such as the interior sulphur alkali of grog production system, to producing low-alkali clinker, reducing Coating clogging successful in pre-heating system.Grog burns till hear rate and has a little increase, and the exhaust air rate of system also can some increase, but the hear rate increasing finally all increases for generated energy; The economic benefit highly significant of whole system; Calcined Activate Coal Gangue powder was produced cement testing result and was shown early stage, when cement and activated coal gangue powder specific surface area are at 365m
2above, within 28 days, compressive strength rate reaches 85-95%, and active performance is good; The 5500 tons of grog lines of take are example, can work in coordination with every year and produce ten thousand tons of high-quality high reactivity activated coal gangue powders of 18-20, are equivalent to the annual ten thousand tons of black coal spoils of 22-25 that effectively consume, newly-increased power generation capacity 2200KW.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described:
Fig. 1 is, general assembly structural representation;
Fig. 2 is, process flow sheet;
In Fig. 1: crushing system 1, raw material grinding mill 2, cyclone cylinder separator 3, e Foerderanlage 4, lift 5, black colliery powder storehouse 6, rotary kiln 7, activation furnace 8, the cooling and air preheating system 9 of material, efficient cyclone 10, preheater 11, waste heat boiler 12, dust collecting system 13, Pneumatic conveying pump 14, stockyard 15.
Embodiment
Below in conjunction with embodiment and embodiment, the present invention is described in further detail:
Embodiment 1
Black coal spoil is after the interior fragmentation of crushing system 1, in feeding raw material grinding mill 2, carry out grinding, after the 3 material gas separation of cyclone cylinder separator, entering black coal spoil powder storehouse 6 stores, black colliery powder feeding activation furnace 8 carries out calcining and activating, after black colliery powder activation, become activated coal gangue powder, enter the interior material gas of efficient cyclone 10 separated, isolated hot flue gas is for cogeneration, activated coal gangue powder is cooling and air preheating system 9 is interior cooling at material, finished product is delivered to stockyard 15 and stores.
Black coal spoil is fractured into particulate in crushing system 1, feeding raw material grinding mill 2, at raw material grinding mill 2, interior by grinding, to be become fineness be that 0.08mm square hole sieve tails over the black coal spoil fine powder that is not more than 8%, levigate black colliery powder enters cyclone cylinder separator 3 with the outlet that the air-flow from waste heat boiler 12 mixes through raw material grinding mill 2, isolated flue gas enters after dust collecting system 13 is processed and discharges, and isolated black colliery powder is through e Foerderanlage 4 and lift 5 feeding black colliery powder storehouse 6 interior storages.
Embodiment 3
Black colliery powder in black colliery powder storehouse 6, after measuring apparatus metering, feeds activation furnace 8 continuously by e Foerderanlage 4 and lift 5; From the smoke-box of rotary kiln 7 kiln tails, drawing 5-10% temperature is that the kiln tail gas of 1050-1200 ℃ enters activation furnace 8; Air enters in the cooling and air preheating system 9 of material and is preheating to after 450-550 ℃, enters activation furnace 8; In activation furnace 8, the high temperature hot gas body of black colliery powder and 1050-1200 ℃ of kiln tail gas from below to up, 450-550 ℃ carries out heat exchange, make black coal spoil pruinescence rapid heating, by regulating air capacity and feeding capacity, the temperature of black colliery powder is controlled to 850 ℃, after the decarburization of black colliery powder fast decoupled, dehydration, generates unbodied Al
2o
3, SiO
2, carry out series of physical chemical process simultaneously and be activated, after black colliery powder is activated, become activated coal gangue powder, granularity is less than 45um.
Embodiment 4
Activated coal gangue powder after activation enters efficient cyclone 10 in company with air-flow and expects that gas is separated, separation efficiency is 92-97%, isolated flue-gas temperature is 750-900 ℃, the waste gas that is 300-350 ℃ with temperature from preheater 11 is mixed into waste heat boiler 12, the steam that waste heat boiler 12 produces is for cogeneration, the part of smoke that goes out waste heat boiler 12 enters dust collecting system 13, after processing, dust collecting system 13 discharges, another part flue gas is transported to raw material grinding mill 2 through pipeline, waste heat boiler 12 rear remaining material recycle separated with waste gas.
Embodiment 5
The isolated activated coal gangue powder of efficient cyclone 10 enters material cold burden and air preheating system 9, the activated coal gangue powder of high temperature makes air be heated to rapidly 450-550 ℃, active coal gangue pruinescence fast cooling is cooled to 100-120 ℃, high-temperature hot air enters activation furnace 8, cooling activated coal gangue powder is sent into stockyard 15 through Pneumatic conveying pump 14, and store after being further cooled to 60-80 ℃, for cement or concrete production.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, not all within the solution of the present invention, any modification of doing, be equal to replacement, improve, within all should being included in protection scope of the present invention.
Claims (5)
1. the collaborative activating coal gangue technique of nsp kiln is by crushing system (1), raw material grinding mill (2), cyclone cylinder separator (3), e Foerderanlage (4), lift (5), black colliery powder storehouse (6), rotary kiln (7), activation furnace (8), cooling and the air preheating system (9) of material, efficient cyclone (10), preheater (11), waste heat boiler (12), dust collecting system (13), Pneumatic conveying pump (14), stockyard (15) forms; It is characterized in that: black coal spoil is in crushing system (1) after fragmentation, in feeding raw material grinding mill (2), carry out grinding, after the separation of cyclone cylinder separator (3) material gas, entering black coal spoil powder storehouse (6) stores, black colliery powder feeding activation furnace (8) carries out calcining and activating, after black colliery powder activation, become activated coal gangue powder, enter material gas separation in efficient cyclone (10), isolated hot flue gas is for cogeneration, activated coal gangue powder is cooling in cooling and air preheating system (9) at material, finished product is delivered to stockyard (15) and stores.
2. a kind of nsp kiln according to claim 1 is worked in coordination with activating coal gangue technique, it is characterized in that: black coal spoil is fractured into particulate in crushing system (1), feeding raw material grinding mill (2), in raw material grinding mill (2), by grinding, being become fineness is that 0.08mm square hole sieve tails over the black coal spoil fine powder that is not more than 8%, the outlet that levigate black colliery powder mixes through raw material grinding mill (2) with air-flow from waste heat boiler (12) enters cyclone cylinder separator (3), isolated flue gas enters after dust collecting system (13) is processed and discharges, isolated black colliery powder feeds storage in black colliery powder storehouse (6) through e Foerderanlage (4) and lift (5).
3. a kind of nsp kiln according to claim 1 is worked in coordination with activating coal gangue technique, it is characterized in that: the black colliery powder in black colliery powder storehouse (6), after measuring apparatus metering, feeds activation furnace (8) continuously by e Foerderanlage (4) and lift (5); From the smoke-box of rotary kiln (7) kiln tail, drawing 5-10% temperature is that the kiln tail gas of 1050-1200 ℃ enters activation furnace (8); Air enters in the cooling and air preheating system (9) of material and is preheating to after 450-550 ℃, enters activation furnace (8); In activation furnace (8), the high temperature hot gas body of black colliery powder and 1050-1200 ℃ of kiln tail gas from below to up, 450-550 ℃ carries out heat exchange, make black coal spoil pruinescence rapid heating, by regulating air capacity and feeding capacity, the temperature of black colliery powder is controlled to 850 ℃, after the decarburization of black colliery powder fast decoupled, dehydration, generates unbodied Al
2o
3, SiO
2, carry out series of physical chemical process simultaneously and be activated, after black colliery powder is activated, become activated coal gangue powder, granularity is less than 45um.
4. a kind of nsp kiln according to claim 1 is worked in coordination with activating coal gangue technique, it is characterized in that: the activated coal gangue powder after activation enters efficient cyclone (10) in company with air-flow and expects that gas is separated, separation efficiency is 92-97%, isolated flue-gas temperature is 750-900 ℃, the waste gas that is 300-350 ℃ with temperature from preheater (11) is mixed into waste heat boiler (12), the steam that waste heat boiler (12) produces is for cogeneration, the part of smoke that goes out waste heat boiler (12) enters dust collecting system (13), after processing, dust collecting system (13) discharges, another part flue gas is transported to raw material grinding mill (2) through pipeline, waste heat boiler (12) rear remaining material recycle separated with waste gas.
5. a kind of nsp kiln according to claim 1 is worked in coordination with activating coal gangue technique, it is characterized in that: the isolated activated coal gangue powder of efficient cyclone (10) enters material cold burden and air preheating system (9), the activated coal gangue powder of high temperature makes air be heated to rapidly 450-550 ℃, active coal gangue pruinescence fast cooling is cooled to 100-120 ℃, high-temperature hot air enters activation furnace (8), cooling activated coal gangue powder is sent into stockyard (15) through Pneumatic conveying pump (14), and store after being further cooled to 60-80 ℃, for cement or concrete production.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104072000A (en) * | 2014-07-02 | 2014-10-01 | 尹小林 | Equipment system for producing building material and generating power by roasting gypsum and coal gangue |
| CN104844043A (en) * | 2014-12-02 | 2015-08-19 | 丁铁群 | Method and device used for preparing high-activity mineral material |
| CN106866007A (en) * | 2017-03-20 | 2017-06-20 | 重庆市新嘉南建材有限责任公司 | A kind of method and system fired gangue for cement raw material |
| CN108558364A (en) * | 2018-07-17 | 2018-09-21 | 乌海市黑白环保能源有限公司 | Colliery wastes brick multifuel combustion lime stone technique |
| CN109200963A (en) * | 2018-09-05 | 2019-01-15 | 辽宁盛达环保科技发展有限公司 | Efficient coupling, Poly-generation, the activating coal gangue technique of low nitrogen |
| CN113108602A (en) * | 2021-04-15 | 2021-07-13 | 韶关市柏林再生资源开发有限公司 | Novel activation calcining kiln for coal gangue |
| CN113354314A (en) * | 2021-07-20 | 2021-09-07 | 深圳市和盛环保科技有限公司 | High-activity cementing material based on engineering muck |
| CN113429136A (en) * | 2021-07-06 | 2021-09-24 | 中南大学 | Coal gangue layered distribution sintering decarburization process |
| CN114620958A (en) * | 2022-04-01 | 2022-06-14 | 西安建筑科技大学 | Process and system for activating coal gangue by utilizing hot air of cement kiln in cooperation |
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| CN101456690A (en) * | 2009-01-07 | 2009-06-17 | 中国建筑材料科学研究总院 | Method and system for preparing active coal gangue |
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| CN101456690A (en) * | 2009-01-07 | 2009-06-17 | 中国建筑材料科学研究总院 | Method and system for preparing active coal gangue |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104072000B (en) * | 2014-07-02 | 2016-03-23 | 尹小林 | Burned plaster and coal gangue produce building materials and power generating equipment system |
| CN104072000A (en) * | 2014-07-02 | 2014-10-01 | 尹小林 | Equipment system for producing building material and generating power by roasting gypsum and coal gangue |
| CN104844043A (en) * | 2014-12-02 | 2015-08-19 | 丁铁群 | Method and device used for preparing high-activity mineral material |
| CN106866007A (en) * | 2017-03-20 | 2017-06-20 | 重庆市新嘉南建材有限责任公司 | A kind of method and system fired gangue for cement raw material |
| CN108558364B (en) * | 2018-07-17 | 2021-08-20 | 乌海市黑白环保能源有限公司 | Process for co-firing limestone by using coal gangue bricks |
| CN108558364A (en) * | 2018-07-17 | 2018-09-21 | 乌海市黑白环保能源有限公司 | Colliery wastes brick multifuel combustion lime stone technique |
| CN109200963A (en) * | 2018-09-05 | 2019-01-15 | 辽宁盛达环保科技发展有限公司 | Efficient coupling, Poly-generation, the activating coal gangue technique of low nitrogen |
| CN113108602A (en) * | 2021-04-15 | 2021-07-13 | 韶关市柏林再生资源开发有限公司 | Novel activation calcining kiln for coal gangue |
| CN113108602B (en) * | 2021-04-15 | 2021-12-17 | 韶关市柏林再生资源开发有限公司 | Novel activation calcining kiln for coal gangue |
| CN113429136A (en) * | 2021-07-06 | 2021-09-24 | 中南大学 | Coal gangue layered distribution sintering decarburization process |
| CN113429136B (en) * | 2021-07-06 | 2022-04-12 | 中南大学 | Coal gangue layered distribution sintering decarburization process |
| CN113354314A (en) * | 2021-07-20 | 2021-09-07 | 深圳市和盛环保科技有限公司 | High-activity cementing material based on engineering muck |
| CN114620958A (en) * | 2022-04-01 | 2022-06-14 | 西安建筑科技大学 | Process and system for activating coal gangue by utilizing hot air of cement kiln in cooperation |
| CN114620958B (en) * | 2022-04-01 | 2024-03-12 | 西安建筑科技大学 | Process and system for synergistically activating coal gangue by using hot air of cement kiln |
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| CN103755171B (en) | 2015-09-30 |
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