CN103090665B - Partial oxygenation combustion-supporting device - Google Patents
Partial oxygenation combustion-supporting device Download PDFInfo
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- CN103090665B CN103090665B CN201310025287.9A CN201310025287A CN103090665B CN 103090665 B CN103090665 B CN 103090665B CN 201310025287 A CN201310025287 A CN 201310025287A CN 103090665 B CN103090665 B CN 103090665B
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- oxygen
- rotary kiln
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- nozzle
- kiln
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- 238000006213 oxygenation reaction Methods 0.000 title claims abstract description 29
- 239000001301 oxygen Substances 0.000 claims abstract description 169
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 169
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 113
- 238000001179 sorption measurement Methods 0.000 claims description 5
- 238000009423 ventilation Methods 0.000 claims description 5
- 230000033228 biological regulation Effects 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 17
- 238000005516 engineering process Methods 0.000 abstract description 12
- 230000008901 benefit Effects 0.000 abstract description 8
- 239000000446 fuel Substances 0.000 abstract description 8
- 238000004134 energy conservation Methods 0.000 abstract description 6
- 239000007921 spray Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 12
- 239000000463 material Substances 0.000 description 11
- 239000004568 cement Substances 0.000 description 10
- 238000002485 combustion reaction Methods 0.000 description 8
- 230000007423 decrease Effects 0.000 description 8
- 238000005265 energy consumption Methods 0.000 description 8
- 229910002091 carbon monoxide Inorganic materials 0.000 description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 5
- 235000011941 Tilia x europaea Nutrition 0.000 description 5
- 239000004571 lime Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 239000002912 waste gas Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 206010020852 Hypertonia Diseases 0.000 description 1
- -1 Jiao Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- IXQWNVPHFNLUGD-UHFFFAOYSA-N iron titanium Chemical compound [Ti].[Fe] IXQWNVPHFNLUGD-UHFFFAOYSA-N 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention relates to a partial oxygenation combustion-supporting device and a method for a rotary kiln. The device is placed beside the rotary kiln and comprises an oxygen source, an oxygen enrichment preheater, an oxygen enrichment spray nozzle, an oxygen enrichment pressure transmitter, an oxygen enrichment concentration transmitter and an electric control gear. A spray opening of the oxygen enrichment spray nozzle is an arc-shaped flat opening and is plugged into a shield wall of a hot kiln hood of the rotary kiln through a sleeved pipe and is arranged according to specific positions, so that the method of the arc-shaped partial oxygenation combustion-supporting is achieved. The advantages of partial oxygenation combustion-supporting technology are fully expressed, the energy conservation and high efficiency are balanced, and obvious comprehensive energy conservation and emission reduction benefits are obtained. The partial oxygenation combustion-supporting device and the method for the rotary kiln can be widely used for most fuels and a variety of rotary kilns.
Description
Technical field
The present invention relates to combustion apparatus, relate in particular to a kind of partial oxygenation combustion-supporting apparatus for rotary kiln and integrated technology.
Background technology
Combustion-supporting or the overall oxygen enriching burning-aid of normal air that what at present general rotary kiln adopted is all, the former is owing to only containing the oxygen less than 21% in air, all the other are inert gas, not only do not participate in combustion-supporting, absorb on the contrary a large amount of heats, thereby reduced performance and the efficiency etc. of rotary kiln, and the general investment of the latter is very large, side effect is many, as furnace life obviously decline, NO
xobviously improve etc.As the scheme of Chinese utility model patent 201120253557.8 (CN202177298U) " is provided with air blast and premixed device in grid cooler bottom; for Secondary Air normal air and the oxygen-enriched air mixed merging of Secondary Air are sent among rotary kiln " as according to this scheme, because cement rotary kiln Secondary Air normal air temperature is between 850-1100 DEG C, and Secondary Air oxygen-enriched air temperature is lower, after mixing, not only not necessarily reach energy-conservation effect, and investment and side effect all very large, thereby practicality is bad.
Local oxygen enriching burning-aid technology is that the inventor proposes (seeing Chinese invention patent ZL97104465.1 (CN1084865C)) the earliest, and 30 kinds of kilns of successful Application at present, have all obtained obvious energy-saving and emission-reduction benefit.But for rotary kiln application local oxygen enriching burning-aid technology, in following patent application or patent, have mentioned, comprise Chinese invention patent application 200910010412.2 (CN101487593A), Chinese utility model patent 200920010534.7 (CN201344555Y) and 201120436379.2 (CN202390203U), but there is respectively following deficiency in these patents: as mentioned in CN101487593A and CN201344555Y " when for cement rotary kiln, the central tube that proprietary rich-oxygen nozzle can be used with cement rotary kiln four-way burner central point firelock substitutes." because cement rotary kiln influence factor is very many, thus often stop kiln, thus both inconvenient with central tube, again can not adjusting angle, result of use is just had a greatly reduced quality; The problem of CN202390203U aspect practical function is more outstanding: practice and research that the inventor separates and applies for oxygen permeable membrane, provable above-mentioned patent energy consumption aspect oxygen is higher, particularly second level membrane separator, energy consumption is higher, and energy consumption cost is also more expensive than installation cost; As the 3000Nm according to proposing in aforementioned patent
3/ hr is example, and the annual operation energy consumption expense of one-level membrane separator is at least the more than 1/2 of installation cost, and adopts VPSA, and its installation cost is lower more than 10% than embrane method, and energy consumption cost is only 65% left and right of embrane method; In addition, this patent " is sent oxygen rich gas into multicenter combustor ", the same with technical scheme described in CN201344555Y or CN101487593A, all as a wind, there is no rich-oxygen nozzle, do not reach maximum energy-saving emission reduction effect, can not give full play to the advantage of local oxygen enriching burning-aid technology.Another above-mentioned technology all adopts embrane method oxygen source, and adopts water-ring vacuum pump and gas-water separation dehumidification stable-pressure device, consequently makes oxygen-enriched air all be with steam, thereby affects oxygen enrichment quality and effects of energy saving and emission reduction.
Summary of the invention
In view of the existing the problems referred to above of prior art, the present invention aims to provide a kind of partial oxygenation combustion-supporting apparatus for rotary kiln to give full play to the advantage of local oxygen enriching burning-aid technology, reaches the effect of better energy-saving and emission-reduction.
Technical solution of the present invention is achieved in that
A kind of partial oxygenation combustion-supporting apparatus for rotary kiln, comprise oxygen source, rich-oxygen preheater, rich-oxygen nozzle, oxygen enrichment pressure transmitter, oxygen-rich concentration transmitter and electric control gear, described oxygen source, rich-oxygen preheater and rich-oxygen nozzle are connected successively by pipeline, described rich-oxygen nozzle is connected with rotary kiln and is arranged in the bottom of rotary kiln burner, and electric control gear is connected respectively with oxygen source, oxygen enrichment pressure transmitter, oxygen-rich concentration transmitter with control line by cable; It is characterized in that:
The spout of described rich-oxygen nozzle is that upper lower edge is flat mouthful of circular arc, and the width of flat mouthful is 0.2～10 with the ratio of height;
Described rich-oxygen nozzle is equidistantly evenly inserted in the interior Lower Half of cover wall of kiln head cover, the spout center of described rich-oxygen nozzle is all positioned on the same concentric circles in cylinder of rotary kiln front end cross section, and described concentrically ringed diameter is 0.3～0.9 with the ratio of the internal diameter of the cylindrical shell of rotary kiln; And the middle vertical plane of the circular arc of the described spout line of centres departs from angle [alpha] of middle vertical plane of the kiln head cover of rotary kiln along the direction of rotation of rotary kiln, α=1～30 °, and depend on the rotary speed of rotary kiln;
Between described rich-oxygen nozzle and kiln head cover cover wall, be provided with the sleeve pipe in order to fixing rich-oxygen nozzle and its angle of adjustment, the outer 70～300mm of cover wall is exposed in sleeve pipe outer end.
Further, under duty, the circular arc of the upper lower edge of described its spout of rich-oxygen nozzle is positioned on the concentric circles in barrel front end cross section of rotary kiln respectively.
Or further, its tube wall symmetry of described sleeve pipe is offered 4-8 group hole, and then the bolt nut in order to the rich-oxygen nozzle of plug-in mounting in fine setting and fixed sleeving is installed.
The invention provides a kind of local oxygen enriching for rotary kiln energy-saving and emission-reduction " camber " burning-aid method: because cylinder of rotary kiln tilts and rotation to kiln head cover direction, so the material in cylindrical shell overturns to kiln head cover direction, and be mainly deposited in the latter half of cylinder of rotary kiln, but be not equally distributed but depart from direction of rotation.So developed the novel rich-oxygen nozzle that is applicable to rotary kiln according to actual kiln condition, the spout of this nozzle is flat mouthful of circular arc, and and then mate with rotary kiln, when its in working order under, the circular arc of its flat mouthful upper lower edge is positioned on the concentric circles in cylindrical shell cross section of rotary kiln respectively; Nozzle quantity is determined according to rotary kiln size.Make like this material heating surface can obtain more efficient heat, the temperature on rotary kiln top is effectively reduced simultaneously, and makes fuel under less combustion air, in time fully fully burning; Thereby realize the range of application that can expand inferior fuel, can give full play to again the performance of high-grade fuel; With the energy-saving and emission-reduction and the prolongation kiln object in age that ensure to reach best.
Bring into play best effects of energy saving and emission reduction for making partial oxygenation combustion-supporting apparatus, the invention provides placement and the maintenance technology scheme of rich-oxygen nozzle: on the cover wall of the kiln head cover of rotary kiln, first open one group of hole according to designing requirement, the center of the end face of this group hole on cover wall inwall is all positioned on the same concentric circles in barrel front end cross section of rotary kiln, this group hole Lower Half in cover wall is equidistant layout: in the time that number of aperture is odd number, angle of kiln head cover central vertical face of rotary kiln is departed from the center of its interstitial hole along the direction of rotation of rotary kiln, similarly, if number of aperture is even numbers, the mid point of 2 middle hole lines of centres departs from angle of rotary kiln middle vertical plane, this angle is carrying out under the duty of local oxygen enriching burning-aid in order to ensureing, the middle vertical plane that is placed on the circular arc that is inserted in the spout line of centres of the rich-oxygen nozzle in described cover cinclides in sleeve pipe departs from angle [alpha] of middle vertical plane of the kiln head cover of rotary kiln along the direction of rotation of rotary kiln, α=1～30 °, depend on the rotary speed of cylinder of rotary kiln, due to cylindrical shell rotation, the material that cylindrical shell turning in turns departs from and will depart from along rotary kiln direction of rotation, for making material absorb as much as possible the efficient heat that oxygen-enriched combustion-supporting discharges, so rich-oxygen nozzle (its by sleeve plug in described hole) also should depart from.Hold successfully behind hole preprepared sleeve pipe (conventionally adopting steel pipe) is placed on to the inside, then with good seals such as refractory materials, then rich-oxygen nozzle is placed on to sleeve pipe the inside, adjust position and angle, fix with jam-packs such as asbestos cords.When described sleeve pipe is installed, reserve the pipeline section of 70-300mm outward at the cover wall of the kiln head cover of rotary kiln, the consideration that goes out to place in the inner rich-oxygen nozzle heat insulation effect on the one hand, has to obtain maintenance and the adjusting of insulation nozzle on the other hand; Simultaneously, described sleeve pipe surrounding symmetry is offered 4 to 8 groups of holes, can be at the outside weldings nut of perforate, this nut internal diameter should be less than the hole of offering, guarantee the corresponding bolt of screwing on, this bolt is for regulating angle and the fixing rich-oxygen nozzle between rich-oxygen nozzle and rotary kiln burner axis, and the angle between rich-oxygen nozzle and rotary kiln burner axis and the length of rotary kiln and the production technology of product are relevant, generally between 10-100 °, regulates.
Or, further, described partial oxygenation combustion-supporting apparatus also comprises the alarm control unit for preventing charging equipment overcurrent or phase shortage, and it is connected with control line by cable with electric control gear, in order to guarantee the safe and stable operation of described partial oxygenation combustion-supporting apparatus itself and rotary kiln.
Further, described partial oxygenation combustion-supporting apparatus also comprises the emergency stop device that is installed on respectively on-the-spot and central control room, it is connected with control line by cable with electric control gear, cannot recover in time in order to prevent partial oxygenation combustion-supporting apparatus to be out of order time, use, guarantee partial oxygenation combustion-supporting apparatus and rotary kiln safe and stable operation.
For small-sized rotary kiln, described oxygen source obtains by embrane method, and the device of oxygen source comprises air cleaner, ventilation blower, film oxygen-enriched generator and dry vacuum pump.This embrane method is without water-ring vacuum pump, thereby oxygen enrichment not only do not need dehumidifying, and oxygen enrichment quality is better.
For medium-and-large-sized rotary kiln, adopt vacuum pressure swing adsorption process (VPSA method) to obtain oxygen source, described oxygen source device comprises air cleaner, air blast, cooler, vavuum pump, adsorption tower, transfer valve and oxygen enrichment regulation and control surge tank.
The Rich Oxygen Amount that general oxygen source provides is that 0.5-100%, the oxygen-rich concentration of the combustion-supporting required air quantity of rotary kiln is generally that 22-90%, oxygen enrichment linear speed are generally 5-500m/s, oxygen enrichment pressure is generally 1-200KPa.
Described oxygen enrichment pressure transmitter is mainly used to monitor the pressure height on oxygen enrichment pipeline.If oxygen enrichment hypertonia, system alarm prompting rich-oxygen nozzle likely stops up, and ascertains the reason as early as possible and solves.If oxygen enrichment hypotony, system alarm prompting oxygen enrichment pipeline or oxygen enrichment high-efficient preheater etc. are likely revealed, and ascertain the reason as early as possible and solve, and guarantee the safe and stable operation of partial oxygenation combustion-supporting apparatus itself and rotary kiln.
Described oxygen-rich concentration transmitter is mainly used in monitoring oxygen-rich concentration, guarantees that oxygen-rich concentration is stablized and the safe and stable operation of rotary kiln.
Full-automatic function control system is set in described electric control gear, there is the start-stop of partial oxygenation combustion-supporting apparatus and the chain function of rotary kiln.
Visible, it is high that the present invention has effectively overcome existing rotary kiln partial oxygenation combustion-supporting apparatus oxygen source energy consumption, the poor problem such as even not energy-conservation of effects of energy saving and emission reduction, flue dust, dust, CO, CO
2, SO
2and NO
xdeng discharge greatly reduce, realized best effects of energy saving and emission reduction; Saving in cost of investment, take into account energy-conservation and efficient, product quality and output raising, side effect minimizing, thereby be more conducive to extend kiln age; Thereby there is significant synthetic energy-saving discharge-reducing benefit.
The present invention is widely used in most of fuel as various oil, gas, powder, Jiao, slurry etc., can expand the range of application of inferior fuel, can give full play to again the performance of high-grade fuel; And can be widely used in various rotary kilns, as cement rotary kiln, zinc oxide rotary kiln, iron oxide rotary kiln, magnesia rotary kiln, Alumina Rotary Kiln, ferrite rotary kiln, lime rotary kiln, titanium-iron powder rotary kiln, Magnetism-Materials Rotary Kiln, roasting rotary kiln with isolation, incineration of waste rotary kiln, carbon rotary kiln, stone coal ore rotary kiln etc.
Brief description of the drawings
Fig. 1 is device schematic diagram of the present invention;
Fig. 2 is the oxygen source device schematic diagram of embodiment 1;
Fig. 3 is the oxygen source device schematic diagram of embodiment 2;
Fig. 4 is rich-oxygen nozzle spout schematic diagram;
Fig. 5 is under duty, the position view of rich-oxygen nozzle spout.
In figure: 1. emergency stop device, 2. electric control gear, 3. oxygen source, 4. rich-oxygen preheater, 5. rich-oxygen nozzle, 6. rotary kiln burner, 7. rotary kiln, 8. alarm control unit, 9. micro-pressure transmitter, 10. oxygen-rich concentration transmitter, 11. materials, the position line of 12. materials in rotary kiln
30. air cleaners, 31. ventilation blowers, 32. film oxygen-enriched generators, 33. dry vacuum pumps, 34. air blasts, 35. coolers, 36. vavuum pumps, 37. adsorption towers, 38. transfer valves, 39. oxygen enrichment regulation and control surge tanks.
A, the width of rich-oxygen nozzle, b, the height of rich-oxygen nozzle
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the invention will be further described:
1 one kinds of film oxygen enriching partial oxygenation combustion-supporting apparatus for lime rotary kiln of embodiment
The described film oxygen enriching partial oxygenation combustion-supporting apparatus for lime rotary kiln, as shown in Figure 1, comprise a kind of partial oxygenation combustion-supporting apparatus for rotary kiln, comprise emergency stop device 1, electric control gear 2, oxygen source 3, rich-oxygen preheater 4, rich-oxygen nozzle 5, oxygen enrichment pressure transmitter 9, oxygen-rich concentration transmitter 10 and warning device 8; Electric control gear 2 is connected with emergency stop device 1, oxygen source 3, warning device 8, oxygen enrichment pressure transmitter 9, oxygen-rich concentration transmitter 10 philosophies with control line by cable, and oxygen source 3, rich-oxygen preheater 4 and rich-oxygen nozzle 5 are connected successively by pipeline; Described oxygen source adopts film oxygen enriching device, as shown in Figure 2, comprises air cleaner 30, ventilation blower 31, film oxygen-enriched generator 32 and dry vacuum pump 33.
Described rich-oxygen nozzle 5 adopts 1～5 group, and its spout as shown in Figure 4, is that upper lower edge is flat mouthful of circular arc, and the width a of flat mouthful is 0.2～10 with the ratio of height b; Under duty, the circular arc of the upper lower edge of its spout is positioned on the concentric circles in barrel front end cross section of rotary kiln, as shown in Figure 5 respectively.
Described rich-oxygen nozzle 5 plug-in mountings are sealed in corresponding 1-5 group sleeve pipe;
Described sleeve pipe equidistantly evenly seals the interior Lower Half of cover wall that is inserted into kiln head cover the pipeline section that exposes outside 70-300mm in the cover wall of kiln head cover; The center of circle of the end face of described sleeve pipe in cover wall is all positioned on the same concentric circles in cylinder of rotary kiln front end cross section, and the ratio of the diameter of circular arc that the end face center of circle of described sleeve pipe in cover wall forms and the internal diameter of the cylindrical shell of rotary kiln is 0.3～0.9; And the middle vertical plane of this circular arc departs from angle [alpha] of middle vertical plane of the kiln head cover of rotary kiln along the direction of rotation of rotary kiln, α=1～30 °, as shown in Figure 5.
Because lime rotary kiln is smaller, therefore oxygen source adopts embrane method both economical.Air is removed and after ventilation blower 31 is pressurized to 0.5-5KPa, is entered film oxygen-enriched generator 32 after the dust that particle diameter is greater than 0.5 μ and carry out oxygen/nitrogen and separate by air cleaner 30, its rich nitrogen is emptying from the top of film oxygen-enriched generator 32, and oxygen enrichment vacuumizes acquisition oxygen-enriched air by dry vacuum pump 33, then deliver in rotary kiln flue, the shell and tube rich-oxygen preheater 4 made from the metal tube of corrosion-and high-temp-resistant carrys out preheating, oxygen enrichment temperature after preheating is between 200-600 DEG C, after insulation, deliver to again the flame kernel of rotary kiln 7 by being placed on one group of rich-oxygen nozzle 5 of rotary kiln burner 6 bottom Cheng Yuan arcs layouts.Described 1-5 group rich-oxygen nozzle 5, be Lower Half in the cover wall of kiln head cover that circular arc is arranged in rotary kiln by the sleeve pipe setting in advance, before described circular arc and cylinder of rotary kiln, correcting is concentric circles, and its diameter is relevant with the internal diameter of cylinder of rotary kiln front end, and ratio between two is between 0.3-0.9.The spout of rich-oxygen nozzle 5 is flat mouthful of circular arc simultaneously, as previously mentioned, under duty, the circular arc of the upper lower edge of its spout is positioned on the concentric circles in barrel front end cross section of rotary kiln respectively, utilize oxygen enrichment high linear speed that flame kernel is moved down near material surface and also do not wash away material 11, as shown in Figure 5, the temperature on rotary kiln 7 tops is declined.Repeatedly regulate again and optimize " combustion wind ratio ", make total combustion air volume reduce 6-40%, reach overheavy firing, improve flame temperature, promote burning completely with minimum oxygen, reduce the discharge of waste gas and dust, minimizing flue gas washes away rotary kiln, thereby reaches synthetic energy-saving discharge-reducing and prolonging furnace age etc.Its Rich Oxygen Amount is approximately the 0.5-100% of combustion air volume, the about 1-5KPa of pressure, and oxygen enrichment linear speed is between 20-100m/s.Device start-stop controlled by electric control gear 2, and realization and rotary kiln 7 chain.High efficiency particle air filter 30 has also designed the filter cotton replacing time and has reported to the police, and meanwhile, alarm control unit 8, micro-pressure transmitter 9, oxygen-rich concentration transmitter 10 and emergency stop device 1, guaranteed the operation of package unit stability and safety.Use after this technology not only lime quality obviously to improve, and energy-conservation 4-20%, CO reduce 20-95%, NO
xreduce 15-70%, CO
2reduce 4-20%, SO
2reduce 4-20%, lingemann blackness decline 1-3 level, coefficient of excess air decline 6-40%, exhaust gas temperature decline 5-30 DEG C, can also use part inferior fuel, thereby obtain better comprehensive benefit.
The present embodiment is applicable to small-sized rotary kiln, and the embrane method oxygen source proposing due to this programme is without water-ring vacuum pump, therefore oxygen enrichment does not only need dehumidifying, and oxygen enrichment quality is better, more easily implements, and synthetic energy-saving discharge-reducing effect is also better.
2 one kinds of VPSA oxygen partial oxygenation combustion-supporting apparatus for cement rotary kiln of embodiment
The described VPSA oxygen partial oxygenation combustion-supporting apparatus for cement rotary kiln, as shown in Figure 1, different from 1 of embodiment, the oxygen source 3 that the present embodiment uses is VPSA oxygens, because the energy consumption of this method is lower, as 10000 sides/time, 29.5% oxygen enrichment, the energy consumption of this method is only 65% left and right of embrane method, and oxygen enrichment quality is better than embrane method.Described oxygen source 3, as shown in Figure 3, comprises air cleaner 30, air blast 34, cooler 35, vavuum pump 36, adsorption tower 37, transfer valve 38 and oxygen enrichment regulation and control surge tank 39.The oxygen-rich concentration of this oxygen source 3 is generally higher, monitors oxygen-rich concentration and guarantees rotary kiln 7 stable operations so need to add oxygen-rich concentration transmitter 10.After being preheating to oxygen enrichment 200-400 DEG C of left and right and being incubated, the kiln hood high-temp waste gas that utilizes rotary kiln 7 delivers to the flame kernel (clinkering zone) of rotary kiln 7 by being placed on one group of rich-oxygen nozzle 5 that rotary kiln burner 6 bottoms become arc line shapeds to arrange.Described rich-oxygen nozzle 5 adopts 3～9 groups, and its spout and the layout in rotary kiln thereof are the same manner as in Example 1, respectively as shown in Figure 4, Figure 5.
Utilize oxygen enrichment high linear speed that flame kernel is moved down near material surface and also do not wash away material 11, as shown in Figure 5, the temperature on rotary kiln 7 tops is declined.Because the clinkering zone of cement rotary kiln 7 is also across the salband near kiln hood, can utilize high-speed oxygen enrichment that rich-oxygen nozzle 5 sprays moving after flame kernel, repeatedly regulate again and optimize " combustion wind ratio ", make total combustion air volume reduce 5-30%, reach overheavy firing, improve flame temperature, promote burning completely with minimum oxygen, reduce the discharge of waste gas and dust, minimizing flue gas washes away rotary kiln, thereby reaches synthetic energy-saving discharge-reducing and prolonging furnace age etc.Its Rich Oxygen Amount is approximately the 0.5-10% of combustion air volume, the about 5-100KPa of pressure, and oxygen enrichment linear speed is between 80-500m/s.The start-stop of device is controlled by electric control gear 2, and can be chain with rotary kiln 7.
Cement rotary kiln uses generally economize on coal after this technology 2-15%, CO to reduce 30-95%, NO
xreduce 20-80%, CO
2reduce 2-15%, SO
2reducing 2-15%, coefficient of excess air decline 5-30%, 10-50 DEG C of exhaust gas temperature decline, lingemann blackness decline to some extent, cement output and quality obviously improves, rotary kiln 7 fault rates obviously decline, the overhaul life obviously extends, can also use part colm, thereby comprehensive benefit can be better etc.
The above; it is only preferably detailed description of the invention of the present invention; but protection scope of the present invention is not limited to this; any be familiar with those skilled in the art the present invention disclose technical scope in; be equal to replacement or changed according to technical scheme of the present invention and inventive concept, within all should being encompassed in protection scope of the present invention.
Claims (6)
1. the partial oxygenation combustion-supporting apparatus for rotary kiln, comprise oxygen source (3), rich-oxygen preheater (4), rich-oxygen nozzle (5), oxygen enrichment pressure transmitter (9), oxygen-rich concentration transmitter (10) and electric control gear (2), described oxygen source (3), rich-oxygen preheater (4) is connected by pipeline successively with more than 1 group rich-oxygen nozzle (5), described rich-oxygen nozzle (5) is connected with rotary kiln and is arranged in the bottom of rotary kiln burner (6), electric control gear (2) is by cable and control line and oxygen source (3), oxygen enrichment pressure transmitter (9), oxygen-rich concentration transmitter (10) connects respectively, it is characterized in that:
Described rich-oxygen nozzle (5) spout is that upper lower edge is flat mouthful of circular arc, and the width a of flat mouthful is 0.2～10 with the ratio of height b;
Described rich-oxygen nozzle (5) is equidistantly evenly inserted in the interior Lower Half of cover wall of kiln head cover, the spout center of described rich-oxygen nozzle (5) is all positioned on the same concentric circles in cylinder of rotary kiln front end cross section, and described concentrically ringed diameter is 0.3～0.9 with the ratio of the internal diameter of the cylindrical shell of rotary kiln; And the middle vertical plane of the circular arc of the described spout line of centres departs from angle [alpha] of middle vertical plane of the kiln head cover of rotary kiln, α=1～30 ° along the direction of rotation of rotary kiln;
Between described rich-oxygen nozzle (5) and kiln head cover cover wall, be provided with the sleeve pipe in order to fixing rich-oxygen nozzle and its angle of adjustment, the outer 70～300mm of cover wall is exposed in sleeve pipe outer end;
Under duty, the circular arc of the upper lower edge of the spout of described rich-oxygen nozzle (5) is positioned on the concentric circles in barrel front end cross section of rotary kiln respectively.
2. the partial oxygenation combustion-supporting apparatus for rotary kiln as claimed in claim 1, is characterized in that:
Described sleeve ring is offered 4-8 group hole around its tube wall symmetry, and the bolt nut in order to the rich-oxygen nozzle (5) of plug-in mounting in fine setting and fixed sleeving is installed.
3. the partial oxygenation combustion-supporting apparatus for rotary kiln as claimed in claim 2, is characterized in that:
Also comprise the alarm control unit (8) for preventing charging equipment overcurrent or phase shortage, described alarm control unit (8) is connected with control line by cable with electric control gear (2).
4. the partial oxygenation combustion-supporting apparatus for rotary kiln as claimed in claim 3, is characterized in that:
Also comprise the emergency stop device (1) that is installed on respectively on-the-spot and central control room, described emergency stop device (1) is connected with control line by cable with electric control gear (2).
5. as the partial oxygenation combustion-supporting apparatus for rotary kiln of claim 1,2,3 or 4 as described in arbitrary, it is characterized in that:
Described oxygen source (3) comprises air cleaner (30), ventilation blower (31), film oxygen-enriched generator (32) and dry vacuum pump (33).
6. as the partial oxygenation combustion-supporting apparatus for rotary kiln of claim 1,2,3 or 4 as described in arbitrary, it is characterized in that: described oxygen source (3) comprises air cleaner (30), air blast (34), cooler (35), vavuum pump (36), adsorption tower (37), transfer valve (38) and oxygen enrichment regulation and control surge tanks (39).
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| CN201310025287.9A CN103090665B (en) | 2012-11-30 | 2013-01-23 | Partial oxygenation combustion-supporting device |
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| CN201210500865 | 2012-11-30 | ||
| CN201210500865.5 | 2012-11-30 | ||
| CN201310025287.9A CN103090665B (en) | 2012-11-30 | 2013-01-23 | Partial oxygenation combustion-supporting device |
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| CN103090665B true CN103090665B (en) | 2014-10-15 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103411420B (en) * | 2013-08-31 | 2014-10-01 | 魏伯卿 | Oxygen-rich partial oxygenation jet-flow combustion-supporting energy-saving emission-reducing system for rotary kiln |
| CN103438699A (en) * | 2013-09-07 | 2013-12-11 | 魏伯卿 | Oxygen-enriched-catalyzing, energy-saving and emission-reducing system for decomposition furnace of rotary kiln |
| CN103672886A (en) * | 2014-01-06 | 2014-03-26 | 南京凯盛国际工程有限公司 | Local oxygen-enriched combustor for cement kiln furnace |
| CN104058606B (en) * | 2014-05-31 | 2016-08-24 | 石家庄新华能源环保科技股份有限公司 | Oxygen-enriched combusting produces the method and apparatus of lime |
| CN104613752B (en) * | 2015-01-05 | 2016-08-17 | 中钢集团鞍山热能研究院有限公司 | Rotary kiln secondary wind oxygen-enriched pulse-combustion air jet system and method |
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