CN101407381A - Oxygen-enriched combustion process for improving cement kiln clinker calcining temperature and apparatus thereof - Google Patents
Oxygen-enriched combustion process for improving cement kiln clinker calcining temperature and apparatus thereof Download PDFInfo
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- CN101407381A CN101407381A CNA2008102335606A CN200810233560A CN101407381A CN 101407381 A CN101407381 A CN 101407381A CN A2008102335606 A CNA2008102335606 A CN A2008102335606A CN 200810233560 A CN200810233560 A CN 200810233560A CN 101407381 A CN101407381 A CN 101407381A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/44—Burning; Melting
- C04B7/4476—Selection of the kiln atmosphere
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Abstract
The invention relates to an oxygen-enriched combustion technical method for improving heating power of a cement kiln and a device thereof. During the process of cement clinker calcination, the invention is characterized in that: 1) a pure oxygen (over 90 percent) feeding device is added at a coal dust combustion zone of the cement kiln so as to lead the combustion zone to form a local thermonuclear area, and with the gradual diffusion of high temperature at the thermonuclear area, the heating power of the whole cement kiln is further improved and stably controlled; and 2) an oxygen feeding device is added at a combustion area of the cement kiln so as to improve and stably control the oxygen content in combustion air within the range of 21.8-33 percent at the combustion area. In a coal supplying system and an air supplying system of the cement kiln, an oxygen-enriched combustion system is formed by arranging at least one high temperature resistance oxygen jet, a pipeline for transmitting oxygen, an oxygen generation device, an oxygen supply-quantity regulating device, a DCS control device and the like inside each independent combustion area of the cement kiln. The invention has the advantages of improving combustion efficiency of faulty coal and the heating power of the cement kiln, and stabilizing thermal regulation of the kiln so as to enhance the quality of the cement and prolong the service life of various heating equipment of the cement kiln.
Description
Technical field
The present invention relates to a kind of processing method and device thereof of using oxygen-enriched combustion technology at the cement kiln firing system.
Technical background
The cement output of China has ranked the first in the world, and the output of China's cement in 2007 reaches 13.54 hundred million tons, accounts for 50% of global output, and new type nonaqueous cement accounts for 53% of cement total output.The new type nonaqueous cement kiln is had relatively high expectations to ature of coal, and the net calorific value of general requirement coal is more than 20934kj/kg, and the fat coal reserves of China are limited.The fat coal reserves of China's southern area still less, mostly the net calorific value of coal also can't make it fully burn by increasing the air excess amount below 20934kj/kg, and temperature of combustion is reduced, and can't reach the calcining requirement of cement clinker.By adopting oxygen-enriched combustion technology that low-calorie coal is fully burnt, improve the calcining temperature of cement clinker, guaranteed the stable of thermal regulation, improved the grog output of new type dry kiln cement, and then the work-ing life of having improved each equipment, reduced the running cost of new type nonaqueous cement kiln.Evidence comprises in fuel oil, fire coal and the combustion gas stove uses oxygen-enriched combustion technology, and social benefit and economic benefit are all very remarkable: average fuel economy 11.8%, the quality product of cement is improved and stablizes, the also corresponding prolongation of furnace service life.Economic benefit is fairly obvious, and general some months just can be regained fully invested.
Summary of the invention
The objective of the invention is: oxygen-enriched combustion technology is applied to the cement kiln firing system, be kiln hood and the kiln tail firing system that oxygen-enriched combustion technology is applied to cement kiln, solved the problem of cement kiln firing system the requirement of ature of coal and cement kiln firing system temperature de-stabilising effect cement clinker quality and cement kiln equipment life.
Principle of the present invention is: the Theory of Combustion of fuel material in pure oxygen and oxygen-enriched environment.Be that fuel material can burn in the environment of oxygen enrichment in aggravation, shortened the heat release time, amount of theoretical flue gas has reduced accordingly, and the temperature of theoretical flue gas will improve; Fuel material ratio of combustion in the environment of pure oxygen is burnt more violent in the environment of oxygen enrichment, and the heat release time is shorter, and the temperature of theoretical flue gas can be higher, and heat release is more abundant.
Technical scheme of the present invention is: a kind of oxygen-enriched burning process that improves the cement kiln clinker calcining temperature, in the burning clinker of cement process, it is characterized in that: increase more than one oxygen feeder unit in the cement kiln combustion zone, send oxygen to regional the giving in its position, make combustion flame form partial thermonuclear district, the oxygen level in the combustion air is improved and stable being controlled in the 22%-35% scope, actual combustion temperature is improved and be controlled at 1600 ℃～1800 ℃.Described oxygen feeder unit is arranged on cement kiln pulverized coal flame place.Described oxygen feeder unit is arranged on each place, combustion zone of cement kiln.Oxygen is meant the industrial oxygen of concentration in the 40%-100% scope.
A kind of oxygen-enriched burning device that improves the cement kiln clinker calcining temperature, it is by cement kiln and it is characterized in that: the pipeline that at least 1 high temperature resistant oxygen jet and delivering oxygen are set in independent burning zone of cement kiln, oxygen generation device, oxygen feed rate setting device, the DCS control device is formed.High temperature resistant oxygen jet be provided with make oxygen can with the well-mixed oxygen jet of combustion air.The pipeline of delivering oxygen is that the coal powder injection mouth that former cement kiln uses is set up a passage, and the passage of being set up transports oxygen.The pipeline of delivering oxygen is to set up delivering oxygen pipeline and high temperature resistant oxygen jet in the different angles of combustion zone.Oxygen feed rate setting device is made up of under meter, flow control valve and pressure unit etc.The DCS control device plays automatic chain control to flow, the pressure of delivering oxygen, guarantees security of system.
Above technical scheme comprises following two realization approach: first kind is to increase the pure oxygen feeder unit at cement kiln coal dust firing band, makes zone of combustion form partial thermonuclear district.Second kind is to increase the oxygen feeder unit in the cement kiln combustion zone, and the oxygen level in the combustion air of combustion zone is improved and stable being controlled in the 21.8%-33% scope.
By first kind of scheme flow process be: the pure oxygen of being made 90% above concentration by oxygen generation system is sent the cement kiln zone of combustion to through high temperature resistant oxygen jet at last through a series of adjustment safety equipment such as oxygen therapy special stop valve door, flow control valve, tensimeter, under meter, tempering safety valve.
By second kind of scheme flow process be: the pure oxygen or the oxygen process of concentration in the 40%-100 scope of being made 90% above concentration by oxygen generation system are cured by oxygen therapy a series of adjustment safety equipment such as special stop valve door, flow control valve, tensimeter, under meter, tempering safety valve, send the cement kiln combustion zone to through high temperature resistant oxygen jet at last.Stable being controlled in the 21.8%-33% scope of oxygen level in the combustion air of assurance cement kiln combustion zone.
Technical term explanation of the present invention:
Described thermonuclear district is meant what pure oxygen formed among a small circle after nozzle exit and coal dust react, even this among a small circle in low grade coal also can burn fully, discharge whole heats, form partial high-temperature zone, the high-temperature zone progressively enlarges, and then improves and the whole cement kiln calcining temperature of stable control.
Oxygen level in the described combustion air requires to be controlled between the 21.8%-33%, mainly be according to coal-fired calorific value and the required Optimal Temperature of cement kiln designed combustion regulate.
Described combustion zone is the combustion zone of coal dust in the cement kiln, promptly refers to the coal dust firing scope of coal powder in kiln head device and kiln tail decomposing furnace burner for the new type nonaqueous cement kiln.
Described oxygen is meant the industrial oxygen of concentration in the 40%-100% scope.
Described a kind of oxygen-enriched burning device of cement kiln calorific value that improves is by minimum 1 the high temperature resistant oxygen jet that is arranged on each independent burning zone in the cement kiln and the pipeline of delivering oxygen, oxygen generation device, oxygen feed rate setting device, formations such as DCS control device.
Described high temperature resistant oxygen jet be provided with make oxygen can with the well-mixed rotating channel oxygen of combustion air special-purpose high temperature nozzle, can make height contain the oxygen and aiding combustion air on the one hand can be uniformly dispersed, height in nozzle exit formation zonule contains the oxygen and aiding combustion air beam on the other hand, it is partial thermonuclear district, quicken burning of coal speed, improve burning of coal efficient, saved the coal consumption of the normal operation of cement kiln, also saved the high operational throughput that contains the oxygen and aiding combustion air, the electricity consumption of having saved conveying fan accordingly.
The described pipeline of giving high temperature resistant oxygen jet feed oxygen: a kind of is that the coal powder injection mouth that former cement kiln uses is set up a passage, and the passage of being set up transports oxygen; Another kind is to set up pipeline and high temperature resistant oxygen jet to high temperature resistant oxygen jet feed oxygen in the different angles of combustion zone.
Described giving on the pipeline of high temperature resistant oxygen jet feed oxygen also is provided with the tempering safety valve, guaranteed the safety of whole oxygen-enriched combusting system.
Described oxygen feed rate setting device is made up of oxygen flow meter specially, flow control valve and pressure unit etc., guaranteed high visual, controllability and the security that contains oxygen and aiding combustion air consumption, improve the security of operability and operation, also helped the accounting of cost.
Described DCS control device plays automatic chain control to flow, the pressure of delivering oxygen, has further improved the security of operation, has reduced cost of labor simultaneously.
Experiment shows
1) thermonuclear district burning be pure oxygen jet exit among a small circle in formation, even this among a small circle in low grade coal also can burn fully, discharge whole heats, form partial high-temperature zone, the high-temperature zone progressively enlarges, and then improves and the stable operating temperature of controlling whole cement kiln.The raising of the operating temperature of cement kiln and the stable charging capacity of cement kiln that also correspondingly makes improve and stablize.The corresponding reduction of coal consumption of cement kiln operation under the situation of equal temperature of combustion.
2) be equivalent to the resulting temperature of ordinary air combustion heavy oil with the mixing air of 26.7% oxygen level burning brown coal or with 21.8% the resulting theoretical combustion temperature of dense oxygen air combustion hard coal.Improve oxygen level in the combustion air, a nitrogen content reduces, the exhaust gas volumn of used air capacity and discharge all significantly reduces, so flame temperature significantly improves along with the increase of oxygen proportion in the combustion air, this kind oxygen-rich concentration is unsuitable too high, and general oxygen enrichment (mixed combustion air) concentration is best when 23-33%, because when oxygen-rich concentration is high again, flame temperature increases less, and expenses such as system oxygen investment can increase greatly, and comprehensive benefit descends on the contrary.
The advantage that increases oxygen-enriched combustion technology in the cement kiln firing system is: 1) improve the temperature of flame in the cement kiln and keep stable, so just guaranteed the quality of cement, also prolonged the work-ing life of the various equipment that are heated of cement kiln simultaneously; 2) ignition temperature of reduction fuel; 3) accelerate combustionvelocity, promote burning fully; 4) reduce the gas fume after burning amount; 5) increase heat utilization ratio; 6) reduce coefficient of excess air; 7) discharging of reduction black smoke, the protection environment.
Description of drawings
Fig. 1 is apparatus of the present invention kiln hood structural representation.
Fig. 2 is apparatus of the present invention kiln stern construction synoptic diagram.
Fig. 3 is high temperature resistant oxygen jet structural representation.
Fig. 4 replaces oil transportation nozzle synoptic diagram for the oxygen therapy nozzle.
Fig. 5 is improved kiln hood oxygen therapy nozzle synoptic diagram.
Fig. 6 is in kiln hood cover side or oxygen therapy nozzle synoptic diagram is installed at the top.
Fig. 7 is improved kiln tail oxygen therapy nozzle synoptic diagram.
Fig. 8 is installed in tertiary-air pipe and decomposing furnace nest shell joint synoptic diagram for the oxygen therapy nozzle.
Fig. 9 is installed in decomposing furnace nest shell any place's synoptic diagram all around for the oxygen therapy nozzle.
Among the figure: 1 is former kiln hood coal powder injection mouth, and 2 are kiln hood oxygen therapy nozzle, and 3 is ball valve, 4 are the tempering safety valve, and 5 are the oxygen therapy under meter, and 6 is pressure unit, 7 is motor-driven control valve, and 8 is needle type valve, and 9 is the oxygenerator group, 10 is kiln tail nest shell, and 11 are kiln tail oxygen therapy nozzle, and 12 is the nozzle fixed body, 13 is the nozzle rotating head, 14 for transforming back kiln hood nozzle, and 15 is the kiln hood cover, and 16 for transforming back kiln tail nozzle.
Specific embodiment
Embodiment 1:
Application in the 2000t/d new type dry kiln firing system:
Project brief: this project 2005 test of going into operation, to the end of the year 2006 used ature of coal calorific value guarantee substantially that more than 20090KJ/KG charging capacity generally more than 175t/h, is produced more normal.2007 because the supply breach increase of fat coal, the calorific value of used coal is substantially about 17200KJ/KG, cause about about 1000 ℃ of kiln hood cover medial temperatures (1350 ℃ of design loads), the equal temperature of secondary air about 850 ℃ (design load is greater than 950 ℃), the equal temperature of tertiary air about 650 ℃ (design load is greater than 800 ℃), average charging capacity 140t/h (design load 175t/h), the actual output wretched insufficiency, also can't reach design requirements each equipment life, and running cost seriously increases.Operation transfers to go to make kiln system steady running.
Design
Kiln hood oxygen-enriched combusting system: the kiln hood spray bar is taken off, high temperature nozzle and connect rustless steel pipe and be installed to former spray bar position, connect the tempering safety valve with Soft tube for oxygen therapy, oxygen generating plant outlet connection traffic variable valve, under meter and pressure unit, link to each other with tempering safety with Soft tube for oxygen therapy again, the measurement data signals of pressure unit, flow control valve and under meter is passed to the DCS system.Select for use this kind scheme mainly to be for example because this scheme is simple and easy to do, does not change the structure of former coal powder injection mouth, reduces investment outlay, as Fig. 1.
Kiln tail oxygen-enriched combusting system: the junction that nozzle is installed to tertiary-air pipe and decomposing furnace lower end nest shell, connect the tempering safety valve with Soft tube for oxygen therapy, oxygen generating plant outlet connection traffic variable valve, under meter and pressure unit, link to each other with tempering safety with Soft tube for oxygen therapy again, the measurement data signals of pressure unit, flow control valve and under meter is passed to the DCS system, select for use this kind scheme mainly be for example because, this scheme is simple and easy to do, do not change the structure of former coal powder injection mouth, reduce investment outlay, as Fig. 2.
Said flow control valve is the 501T series motor-driven control valve (model: 501T-90JW118-3600LA) that adopts Wuxi frock (KOSO) in the design; Pressure unit is to adopt Rosemount China Inc.'s 1151 series (models: 1151GP-6S22B1M1IFJ1DF); Under meter is the SF12 series metal spinner-type flowmeter (model: SF12-ROYM2EK3EX, specification: DN50, float H15.8, PN1.6) that adopts Chengde GuoCheng Electron company; The DCS system adopts the Freelance v8.1 of German ABB AB.
The effect explanation
1, kiln hood: earlier the pure oxygen top hole pressure is controlled at 0.25MPa, flow control is at 4m3/h.Test-results: temperature of kiln head rises to 1200 ℃ from 1100 ℃, and flame obviously brightens (having improved the burning of coal rate), and this moment, charging capacity rose to 145t/h by 135t/h, and coal powder injection pipe coal feeding amount reduces to 6.15t/h by 6.3t/h; When the pure oxygen top hole pressure is controlled at 0.5MPa, flow control is at 6m3/h, temperature of kiln head rises to 1350 ℃ from 1200 ℃, flame becomes blueness, temperature is very stable, and secondary air temperature, tertiary air temperature have also reached designing requirement (design load secondary air temperature greater than 950 ℃, tertiary air temperature greater than 800 ℃), and this moment, charging capacity rose to 165t/h by 145t/h, coal powder injection pipe coal feeding amount reduces to 5.9t/h by 6.15t/h, and charging capacity also has the trend that rises.
2, kiln tail: earlier the pure oxygen top hole pressure is controlled at 0.25MPa, flow control is at 6m3/h, and calciner temperature rises to 1050 ℃ from 950 ℃, and coal powder injection pipe coal feeding amount reduces to 8.8t/h by 9.0t/h.When the pure oxygen top hole pressure is controlled at 0.5MPa, flow control is at 9m3/h, and calciner temperature rises to 1300 ℃ from 1050 ℃, and coal powder injection pipe coal feeding amount reduces to 8.4t/h by 8.8t/h.
Kiln hood and the kiln tail 1t/h that is sparing in the use of coal altogether, the market price of present non-prime coal is about 500 yuan/ton, per hour saves 500 yuan after promptly adopting oxygen-enriched combustion technology.Per hour shared pure oxygen 15m3, the market price of pure oxygen is about 4.5 yuan/every cube, per hour spends more expense 15*4.5=67.5 unit after promptly adopting oxygen-enriched combustion technology.Here only from what consider, also do not calculate and prolong direct economic benefit, equipment life that the output increase brings the equipment amortization cost that produces and reduce and add and reduce the discharging of black smoke behind the oxygen-enriched combustion technology and then reduce cost such as environmental pollution with the minimizing of coal and oxygen consumption two aspects.Oxygen-enriched combustion technology is applied to the firing system of new type dry kiln thus, promptly helps reducing the Cement Production cost, help the protection of environment again, is the requirement that meets national Eleventh Five-Year Plan plan fully.
Embodiment 2:
The mounting means of nozzle is in the following way:
1, kiln hood: the oil nozzle of original kiln hood coal powder injection mouth system is taken off, the special-purpose oxygen therapy of eddy channel high temperature nozzle is installed, as Fig. 4.
2, kiln tail: the coal powder injection mouth of original two passages is transformed into triple channel coal powder injection mouth, and center-aisle is carried the oxygen-enriched combustion-supporting air, as Fig. 7.
All the other are identical with embodiment 1.
Embodiment 3:
The mounting means of nozzle is in the following way:
1, kiln hood: the coal powder injection mouth in original five-way road is transformed into six passage coal powder injection mouths, and center-aisle delivery industry oxygen is as Fig. 5.
2, kiln tail: meet decomposing furnace nest shell place in tertiary-air pipe the eddy channel high temperature nozzle is installed, as Fig. 8.
All the other are identical with embodiment 1.
Embodiment 4:
The mounting means of nozzle is in the following way:
1, kiln hood: in kiln hood cover side or the top the special-purpose oxygen therapy of eddy channel high temperature nozzle is installed, as Fig. 6.
2, kiln tail: improved kiln tail nozzle is installed at any place around decomposing furnace nest shell, as Fig. 9.
All the other are identical with embodiment 1.
Claims (10)
1, a kind of oxygen-enriched burning process that improves the cement kiln clinker calcining temperature, in the burning clinker of cement process, it is characterized in that: increase more than one oxygen feeder unit in the cement kiln combustion zone, send oxygen to regional the giving in its position, make combustion flame form partial thermonuclear district, the oxygen level in the combustion air is improved and stable being controlled in the 22%-35% scope, actual combustion temperature is improved and be controlled at 1600 ℃～1800 ℃.
2, a kind of oxygen-enriched burning process that improves the cement kiln clinker calcining temperature according to claim 1, it is characterized in that: described oxygen feeder unit is arranged on cement kiln pulverized coal flame place.
3, a kind of oxygen-enriched burning process that improves the cement kiln clinker calcining temperature according to claim 1 is characterized in that: described oxygen feeder unit is arranged on each place, combustion zone of cement kiln.
4, a kind of oxygen-enriched burning process that improves the cement kiln clinker calcining temperature according to claim 1, it is characterized in that: oxygen is meant the industrial oxygen of concentration in the 40%-100% scope.
5, a kind of oxygen-enriched burning device that improves the cement kiln clinker calcining temperature, it is by cement kiln and it is characterized in that: the pipeline that at least 1 high temperature resistant oxygen jet and delivering oxygen are set in independent burning zone of cement kiln, oxygen generation device, oxygen feed rate setting device, the DCS control device is formed.
6, a kind of oxygen-enriched burning device that improves the cement kiln clinker calcining temperature according to claim 5 is characterized in that: high temperature resistant oxygen jet be provided with make oxygen can with the well-mixed oxygen jet of combustion air.
7, a kind of oxygen-enriched burning device that improves the cement kiln clinker calcining temperature according to claim 5 is characterized in that: the pipeline of delivering oxygen is that the coal powder injection mouth that former cement kiln uses is set up a passage, and the passage of being set up transports oxygen.
8, a kind of oxygen-enriched burning device that improves the cement kiln clinker calcining temperature according to claim 5 is characterized in that: the pipeline of delivering oxygen is to set up delivering oxygen pipeline and high temperature resistant oxygen jet in the different angles of combustion zone.
9, a kind of oxygen-enriched burning device that improves the cement kiln clinker calcining temperature according to claim 5, it is characterized in that: oxygen feed rate setting device is made up of under meter, flow control valve and pressure unit etc.
10, a kind of oxygen-enriched burning device that improves the cement kiln clinker calcining temperature according to claim 5 is characterized in that: the DCS control device plays automatic chain control to flow, the pressure of delivering oxygen, guarantees security of system.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101792276B (en) * | 2010-02-25 | 2011-12-21 | 东南大学 | Method for producing partial full-oxygen type cement suitable for separation and collection of CO2 |
| CN101769537B (en) * | 2010-01-12 | 2012-02-22 | 清华大学 | Oxygen-enriched burning device burning inferior coal |
| CN103496863A (en) * | 2013-09-28 | 2014-01-08 | 内蒙古工业大学 | Production method of cement clinker by calcination with oxygen-rich reinforced lignite |
| CN104370120A (en) * | 2013-08-13 | 2015-02-25 | 宁夏嘉翔自控技术有限公司 | Automatic feed system of electric forge furnace |
| CN104534506A (en) * | 2014-12-16 | 2015-04-22 | 北京汉能清源科技有限公司 | Air supply control method and system of oxygen-enriched combustion rotary cement kiln |
-
2008
- 2008-11-12 CN CNA2008102335606A patent/CN101407381A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769537B (en) * | 2010-01-12 | 2012-02-22 | 清华大学 | Oxygen-enriched burning device burning inferior coal |
| CN101792276B (en) * | 2010-02-25 | 2011-12-21 | 东南大学 | Method for producing partial full-oxygen type cement suitable for separation and collection of CO2 |
| CN104370120A (en) * | 2013-08-13 | 2015-02-25 | 宁夏嘉翔自控技术有限公司 | Automatic feed system of electric forge furnace |
| CN103496863A (en) * | 2013-09-28 | 2014-01-08 | 内蒙古工业大学 | Production method of cement clinker by calcination with oxygen-rich reinforced lignite |
| CN103496863B (en) * | 2013-09-28 | 2016-03-02 | 内蒙古工业大学 | A kind of production method of oxygen enrichment strengthening brown coal calcination of cement clinker |
| CN104534506A (en) * | 2014-12-16 | 2015-04-22 | 北京汉能清源科技有限公司 | Air supply control method and system of oxygen-enriched combustion rotary cement kiln |
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Open date: 20090415 |