A kind of nsp kiln works in coordination with activating coal gangue technique
Technical field
The present invention relates to activating coal gangue technical field, especially a kind of nsp kiln works in coordination with activating coal gangue technique.
Background technology
Coal is the topmost energy of China, its resource is very abundant, 2008 annual production are more than 27.16 hundred million tons, and coal gangue is a kind of solid waste produced 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, and the coal gangue accumulated over the years is more than 2,700,000,000 tons, take up an area more than 300,000 mu, and quantity still increases in continuation.A large amount of coal gangues seriously pollutes environment, and has occupied a large amount of soils and farmland, destroys land resources. and if effectively do not utilized it, will the normal development of China coal industry be had a strong impact on, affect surrounding environment quality.Though coal gangue is a kind of solid waste, as long as carrying out reasonable employment to it is also a kind of resource, material of construction and low calorie fuels use can be made.
China is whole world manufacture of cement first big country, a large amount of energy and resource is consumed in the production process of cement, also consumes natural mineral resource non-renewable in a large number 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, thus economize on resources and the consumption of the energy, alleviate the pollution of ecotope significant.
Coal gangue, in the Commercial cultivation of cement, usually adopts " two mix new technology ", 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 the coal gangue of admixture, normally through spontaneous firing, or other modes are calcined and loss on ignition is qualified, because self-igniting coal gangue activity is lower, improve its volume very difficult (general addition content 12 ~ 15%) in cement, 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 enterprise is in meagre profit even lossing state, the technology used 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, a large amount of high-quality high reactivity cement additive can be provided for manufacture of cement, heat that black coal spoil contains can be made full use of again for cogeneration, considerable economic benefit can be produced for cement production enterprise, also for the recycling of the waste produced 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 realizes greenization and high performance, and emphasis economizes on resources and the energy, and one of important measures are exactly utilize industrial residue for manufacture of cement in a large number.Coal gangue is the industrial residue that current quantity discharged is maximum, utilization ratio is minimum, and cause the not high major cause of utilization ratio to be that the pozzolanic activity of natural gangue is too low, therefore, improve black coal gangue utilization rate, most important measure improves its pozzolanic activity exactly.
Application number be 200820209744.4 patent document disclose a kind of kiln for activating coal gangues, bulky, body of heater and auxiliary building are built complicated, cost is high, the smoke contamination produced during coal gangue combustion is serious, and coal gangue combustion temperature is uncontrollable, affects coal gangue material activity.
Now invent a kind of nsp kiln and work in coordination with activating coal gangue technique, utilize current Chinese large-sized Portland clinker production line to work in coordination with and performance activation is carried out to black coal spoil, by optimizing and controlling the various process parameters in reactivation process, improve the activity of black coal spoil to greatest extent, for cement and concrete production provide the mixing material of high-quality.
Summary of the invention
The object of the invention is to overcome deficiency of the prior art, a kind of nsp kiln is provided to work in coordination with activating coal gangue technique, utilize current Chinese large-sized Portland clinker production line to work in coordination with and performance activation is carried out to coal gangue, by optimizing and controlling the various process parameters in reactivation process, improve the activity of black coal spoil to greatest extent, for cement and concrete production provide the mixing material of high-quality.
The present invention to achieve these goals, adopts following technical scheme: a kind of nsp kiln works 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, material cooling and air preheating system, efficient cyclone, preheater, waste heat boiler, dust collecting system, Pneumatic conveying pump, stockyard is formed; It is characterized in that: black coal spoil is in crushing system after fragmentation, grinding is carried out in feeding raw material grinding mill, after cyclone cylinder separator material gas is separated, enter black coal spoil powder storehouse store, black colliery powder feeding activation furnace carries out calcining and activating, become activated coal gangue powder after black colliery powder activation, enter material gas in efficient cyclone and be separated, isolated heat smoke is used for cogeneration, activated coal gangue powder cools in material cooling and air preheating system, 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, become fineness to be that 0.08mm square hole sieve tails over the black coal spoil fine powder being not more than 8% by grinding, the outlet mixed through raw material grinding mill enters cyclone cylinder separator to levigate black colliery powder with the air-flow from waste heat boiler, isolated flue gas discharges after entering dust collecting system process, and isolated black colliery powder feeds in black colliery powder storehouse through e Foerderanlage and lift and stores.
Black colliery powder in black colliery powder storehouse, after measuring apparatus metering, feeds activation furnace continuously by e Foerderanlage and lift; The kiln tail gas being 1050-1200 DEG C from the smoke-box extraction 5-10% temperature of rotary kiln enters activation furnace; Air enters activation furnace after entering and being preheating to 450-550 DEG C in material cooling and air preheating system; In activation furnace, black colliery powder carries out heat exchange with the high-temperature hot gas of 1050-1200 DEG C of kiln tail gas from below to up, 450-550 DEG C, make black coal spoil pruinescence rapid heating, by regulating air capacity and feeding capacity, the temperature of black colliery powder is controlled at 850 DEG C, after the decarburization of black colliery powder fast decoupled, dehydration, generate unbodied Al
2o
3, SiO
2, carry out series of physical chemical process simultaneously and activated, become activated coal gangue powder after black colliery powder is activated, granularity is less than 45um.
Activated coal gangue powder after activation enters efficient cyclone in company with air-flow and carries out the separation of material gas, separation efficiency is 92-97%, isolated flue-gas temperature is 750-900 DEG C, the waste gas being 300-350 DEG C with the temperature from preheater is mixed into waste heat boiler, the steam that waste heat boiler produces is used for cogeneration, the part of smoke going out waste heat boiler enters dust collecting system, discharge after dust collecting system process, another part flue gas is through Cemented filling to raw material grinding mill, and waste heat boiler is separated rear remaining material recycle 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 rapidly heated to 450-550 DEG C, active coal gangue pruinescence fast cooling is cooled to 100-120 DEG C, high-temperature hot air enters activation furnace, the activated coal gangue powder of cooling is pumped into stockyard through air conveying, and store after being cooled to 60-80 DEG C further, 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 fragmentation, grinding are carried out to black coal spoil, 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 burns chilling soon at about 850 DEG C, dewaters completely under prerequisite in guarantee, 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 controls, at 5 ﹪ ~ 8 ﹪, to be generally no more than 10%; Preheated air from material cooling and air preheating system is 450-550 DEG C, provides the oxygen needed for black gangue decarburization; Temperature from kiln tail hot blast is 1050 ~ 1200 DEG C, and both are mixed in proportion rear temperature about 700 DEG C, can ensure carbon burning contained in black coal spoil and burn completely; Carbon burning in black coal spoil can make the temperature in activation furnace raise Bing and remain on 850 DEG C, and too high temperature will reduce Al
2o
3, SiO
2activity.Have the advantages that specific surface area is large, defect is many, activity is high after black colliery powder activation.Activated coal gangue powder after chilling sends into activated coal gangue powder stockyard by Pneumatic conveyer.Activated coal gangue powder uses 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, improves the activity of activated coal gangue powder to a certain extent, and there is an optimum value; The present invention is very effective for the Coating clogging alleviating precalcining system, is conducive to producing low-alkali clinker; The performance of kiln ash activated coal gangue powder is close with GBFS, and significantly improve than natural gangue active, be a kind of active addition of good performance, in complex cement, addition content can up to 35 ~ 50%.
The activated coal gangue powder that the present invention produces, its granularity < 45um, without the need to grinding, and go out to grind that cement is arranged in pairs or groups in proportion, be finished cement after homogenizing, power savings is remarkable; Due to the hot blast temperature going out efficient cyclone higher (more than 800 DEG C), after mixing with the waste gas (about 310 DEG C) going out preheater, temperature is 365 DEG C, be equivalent to temperature and improve 55 DEG C, increased substantially the utilising efficiency of waste heat, 1 ton of grog can new increment life insurance 10KWh; Utilize a small amount of waste heat of kiln tail and kiln ash to dewater to black coal spoil, activate, both improved the activity after black activating coal gangue to greatest extent, made full use of again the black coal spoil combustion heat to improve the generated energy of grog, really accomplish to make the best use of everything.
It is useful that the present invention produces grog, effectively can reduce the internal circulating load of the objectionable impuritiess such as sulphur alkali in grog production system, to production low-alkali clinker, reduces Coating clogging successful in pre-heating system.Sinter leaching hear rate has a little increase, and the exhaust air rate of system also can some increase, but the hear rate increased finally all increases for generated energy; The economic benefit highly significant of whole system; Calcined Activate Coal Gangue powder production in early stage cement testing result shows, when cement and activated coal gangue powder specific surface area are at 365m
2above, within 28 days, compressive strength rate reaches 85-95%, and activities present is excellent; For 5500 tons of grog lines, every year can cooperating manufacture 18-20 ten thousand tons of high-quality high reactivity activated coal gangue powders, be equivalent to effectively consume 22-25 ten thousand tons of black coal spoils, newly-increased power generation capacity 2200KW every year.
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, material cooling and air preheating system 9, 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 in crushing system 1 after fragmentation, grinding is carried out in feeding raw material grinding mill 2, after cyclone cylinder separator 3 material gas is separated, enter black coal spoil powder storehouse 6 store, black colliery powder feeding activation furnace 8 carries out calcining and activating, become activated coal gangue powder after black colliery powder activation, enter material gas in efficient cyclone 10 and be separated, isolated heat smoke is used for cogeneration, activated coal gangue powder cooling in material cooling and air preheating system 9, is delivered to stockyard 15 and stores by finished product.
Embodiment 2
Black coal spoil is fractured into particulate in crushing system 1, feeding raw material grinding mill 2, in raw material grinding mill 2, become fineness to be that 0.08mm square hole sieve tails over the black coal spoil fine powder being not more than 8% by grinding, the outlet mixed through raw material grinding mill 2 enters cyclone cylinder separator 3 to levigate black colliery powder with the air-flow from waste heat boiler 12, isolated flue gas enters dust collecting system 13 and processes rear discharge, and isolated black colliery powder feeds in black colliery powder storehouse 6 through e Foerderanlage 4 and lift 5 and stores.
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; The kiln tail gas being 1050-1200 DEG C from the smoke-box extraction 5-10% temperature of rotary kiln 7 kiln tail enters activation furnace 8; Air enters activation furnace 8 after entering and being preheating to 450-550 DEG C in material cooling and air preheating system 9; In activation furnace 8, black colliery powder carries out heat exchange with the high-temperature hot gas of 1050-1200 DEG C of kiln tail gas from below to up, 450-550 DEG C, make black coal spoil pruinescence rapid heating, by regulating air capacity and feeding capacity, the temperature of black colliery powder is controlled at 850 DEG C, after the decarburization of black colliery powder fast decoupled, dehydration, generate unbodied Al
2o
3, SiO
2, carry out series of physical chemical process simultaneously and activated, become activated coal gangue powder after black colliery powder is activated, granularity is less than 45um.
Embodiment 4
Activated coal gangue powder after activation enters efficient cyclone 10 in company with air-flow and carries out the separation of material gas, separation efficiency is 92-97%, isolated flue-gas temperature is 750-900 DEG C, the waste gas being 300-350 DEG C with the temperature from preheater 11 is mixed into waste heat boiler 12, the steam that waste heat boiler 12 produces is used for cogeneration, the part of smoke going out waste heat boiler 12 enters dust collecting system 13, discharge after dust collecting system 13 processes, another part flue gas is through Cemented filling to raw material grinding mill 2, and waste heat boiler 12 is separated rear remaining material recycle 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 rapidly heated to 450-550 DEG C, active coal gangue pruinescence fast cooling is cooled to 100-120 DEG C, high-temperature hot air enters activation furnace 8, the activated coal gangue powder of cooling sends into stockyard 15 through Pneumatic conveying pump 14, and store after being cooled to 60-80 DEG C further, for cement or concrete production.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all within the solution of the present invention, any amendment done, equivalent replacement, improvement, all should be included within protection scope of the present invention.