CN103175394A - Energy-saving emission-reducing partial oxygen-increasing combustion-supporting device used for cement kiln - Google Patents
Energy-saving emission-reducing partial oxygen-increasing combustion-supporting device used for cement kiln Download PDFInfo
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
An energy-saving emission-reducing partial oxygen-increasing combustion-supporting device used for a cement kiln is placed beside the cement kiln. A VPSA oxygen enrichment generation device of the energy-saving emission-reducing partial oxygen-increasing combustion-supporting device is connected with an oxygen enrichment control device. The oxygen enrichment control device is connected with an air blower and connected with an oxygen enrichment preheater through an oxygen conveying pipeline. An oxygen enrichment pressure transmitter, an oxygen enrichment concentration transmitter, an oxygen enrichment flow rate transmitter and a control valve are respectively arranged on the oxygen conveying pipeline. A smoke inlet of the oxygen enrichment preheater is connected with high-temperature waste gas of the cement kiln, and an oxygen enrichment gas outlet is connected with an oxygen enrichment jet nozzle. The oxygen enrichment jet nozzle is arranged on the lower half portion of a rotary kiln combustion device. According to the energy-saving emission-reducing partial oxygen-increasing combustion-supporting device used for the cement kiln, not only can materials absorb more effective heat energy as much as possible, but also the temperature in the upper portion of the cement kiln can be reduced effectively and fuel can be burnt fully, timely and completely with less combustion air. Moreover, performance of high-quality fuel can be fully developed so that usage of poor-quality fuel becomes possible. Smoke dust, dust, CO, CO2, NOX and the like are reduced. The energy-saving emission-reducing partial oxygen-increasing combustion-supporting device used for the cement kiln has remarkable comprehensive energy-saving emission-reducing benefit.
Description
Technical field
The present invention relates to a kind of oxygen-enriched combustion aid for cement kiln.
Background technology
At present general cement kiln adopts is all the combustion-supporting or whole oxygen enriching burning-aids of normal air, 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 the performance of cement kiln and efficiency etc., and the general investment of the latter is very large, side effect many as furnace life obviously descend, NO
xobviously improve etc.As Chinese utility model patent 201120253557.8(CN202177298U) scheme " be 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 being sent among cement rotary kiln ", as according to this scheme, due to rotary kiln Secondary Air normal air temperature between 850-1100 ℃, and Secondary Air oxygen-enriched air temperature is lower, not only not necessarily reach energy-conservation effect after mixing, and investment and side effect all very large, thereby practicality is bad.
The local oxygen enriching burning-aid technology is that the inventor proposes (seeing Chinese invention patent ZL97104465.1(CN1084865C) the earliest), at present successful Application more than 30 kind of kiln, all obtained obvious energy-saving and emission-reduction benefit.For cement kiln application local oxygen enriching burning-aid technology, although have mentioned in following patent application or patent, comprise Chinese invention patent application 200810233560.6(CN101407381A), 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 said as CN101407381A " effect explanation " assumes as a matter of course fully, it is very unrealistic: as kiln hood adds pure oxygen flow 6m
3/ h, temperature can improve 150 ℃, and coal feeding amount drops to 5.9 t/h from 6.15 t/h, coal low heating value 17200 KJ/Kg, calculating 6.15 t/h coal consumptions according to these data, at least to need air capacity be 28240 m
3/ h, if after mixing, oxygen-rich concentration only increases by 0.02 percentage point, so temperature of kiln head can not improve 150 ℃! another this Patent design multiple rich-oxygen nozzle, all Practical significance is little, and special " as Fig. 6 ", be inserted in rich-oxygen nozzle at " kiln head cover side or top ", because in kiln head cover be a large amount of Secondary Airs from grate cooler, oxygen is added in kiln head cover and is equivalent to whole oxygenation! salband temperature near kiln head cover could obviously improve like this, and the process task of salband is to make grog cooling rapidly, improves temperature and can lose more than gain! mention in CN101487593A and CN201344555Y that " for cement rotary kiln the time, the central tube that proprietary rich-oxygen nozzle can be used with cement rotary kiln four-way burner central point firelock substitutes." because the cement rotary kiln influence factor is very many; so often stop kiln; therefore both inconvenient with central tube; again can not adjusting angle; result of use is just had a greatly reduced quality; even do not have effect to also have side effect: because can make flame kernel (clinkering zone) be advanced to salband (shortening) by the central tube oxygenation, have a strong impact on the normal operation of the cooling and rotary kiln of grog; 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, second level membrane separator particularly, 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/ h is example, and the operation energy consumption expense in one-level membrane separator every year is at least 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 CN201344555Y or the described technical scheme of CN101487593A, all as a wind, there is no rich-oxygen nozzle, do not reach the 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 the 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 saturated vapor, and its vapor content is at least 2 times of VPSA, has a strong impact on oxygen enrichment quality and effects of energy saving and emission reduction.
Summary of the invention
The object of the present invention is to provide a kind of advantage that adopts rich-oxygen nozzle to give full play to the local oxygen enriching burning-aid technology, reach the more partial oxygenation combustion-supporting apparatus for the cement kiln energy-saving and emission-reduction of happy festival time energy emission reduction effect.
The present invention adds a set of partial oxygenation combustion-supporting apparatus cement kiln is other, and this device mainly comprises the VPSA(Vacuum Pressure Swing Adsorption) oxygen enrichment generating means, air blast, oxygen enrichment regulation device, rich-oxygen preheater, rich-oxygen nozzle, alarm control unit, oxygen enrichment pressure transmitter, oxygen-rich concentration transmitter, oxygen-rich stream transmitter, emergency stop device and electric control gear etc.Wherein, the outlet of VPSA oxygen enrichment generating means is connected with the oxygen enrichment import of oxygen enrichment regulation device, the air intlet of this oxygen enrichment regulation device is connected with air blast, so be transported to by air blast the oxygen that air in the oxygen enrichment regulation device and oxygen enrichment generating means make, mutually is mixed into oxygen rich gas.Be provided with the oxygen rich gas outlet on above-mentioned oxygen enrichment regulation device, it is connected with the import of rich-oxygen preheater oxygen enrichment by the oxygen therapy pipeline.Be respectively equipped with oxygen enrichment pressure transmitter, oxygen-rich concentration transmitter, oxygen-rich stream transmitter and controlling valve on this oxygen therapy pipeline.Wherein, the oxygen enrichment pressure transmitter is mainly used in monitoring the pressure height on the oxygen enrichment pipeline, if the oxygen enrichment hypertonia, system alarm prompting rich-oxygen nozzle likely stops up, and ascertains the reason as early as possible and solves; If the oxygen enrichment hypotony, system alarm prompting oxygen enrichment pipeline or rich-oxygen preheater etc. likely leak, and ascertain the reason as early as possible and solve.The oxygen-rich concentration transmitter is mainly used in monitoring oxygen-rich concentration, guarantees that oxygen-rich concentration is stable.The oxygen-rich stream transmitter is mainly used in monitoring the oxygen enrichment flow, guarantees the oxygen enrichment stability of flow.Above-mentioned rich-oxygen preheater is air preheater, and its smoke inlet is connected with cement kiln high-temperature waste gas, and the oxygen rich gas outlet is connected with rich-oxygen nozzle.This rich-oxygen nozzle is located at the Lower Half of rotary kiln burner.Described cement kiln high-temperature waste gas can be the kiln hood high-temp waste gas, can be kiln tail high-temp waste gas, can also be the high-temp waste gas of cement kiln bypass; Best above-mentioned oxygen enrichment pipeline also is provided with a branch road, and this branch road is provided with controlling valve and rich-oxygen preheater, and the end of branch road is connected with the rich-oxygen nozzle on being located at the cement kiln tail dore furnace.
For making rich-oxygen nozzle performance optimum efficiency, be preferably on the kiln head cover Lower Half wall of rotary kiln burner and establish n group through hole, 1≤n≤8, establish a sleeve pipe and this sleeve pipe in each through hole and stay 70-300mm outside the kiln head cover wall, establish 4-8 group through hole in this pipe surrounding symmetry, be welded with nut on hole, threaded connection bolt on it.Be built-in with rich-oxygen nozzle at above-mentioned sleeve pipe, both gaps are provided with asbestos cord.Preferably rich-oxygen nozzle is the downside that circular arc is arranged in rotary kiln burner, and departs from angle of rotary kiln direction of rotation, and this angle is directly proportional to rotary kiln rotating speed size, and generally, between 2-50 °, this circular arc must be in the Lower Half of rotary kiln burner simultaneously.
Above-mentioned oxygen enrichment generating means, air blast, oxygen enrichment regulation device, oxygen enrichment pressure transmitter, oxygen-rich concentration transmitter, oxygen-rich stream transmitter, rotary kiln and cement kiln tail dore furnace all are connected by cable with electric control gear, for controlling, respectively install start-stop.This electric control gear also is connected with warning device, for preventing relevant charging equipment overcurrent or lacuna and controlling the stable of oxygen enrichment flow, pressure and concentration.Best above-mentioned electric control gear also is connected with emergency stop device, in the time of can't recovering in time for preventing partial oxygenation combustion-supporting apparatus to be out of order, uses.
The present invention compared with prior art has following advantage:
1, adopt rich-oxygen nozzle, particularly be arranged as circular arc, both made material absorb as far as possible more efficient heat, can effectively reduce again the temperature on cement kiln top, and make fuel fully fully burning in time under less combustion air; The range of application of inferior fuel can be enlarged, the performance of high-grade fuel can be given full play to again; Can be obviously energy-conservation, improve product quality and output, again can prolonging furnace age and maintenance period, minimizing flue dust, dust, CO, CO
2and NO
xdeng, there is significant synthetic energy-saving discharge-reducing benefit.
2, the VPSA method is than embrane method investment with energy consumption is lower, the oxygen enrichment quality better and the VPSA method is more ripe, scale is larger, and investment and the energy consumption of the embrane method that compares are lower.
3 with compare in existing oxygen enrichment is added in wind, Secondary Air or a tertiary air, side effect still less, the synthetic energy-saving discharge-reducing better effects if.
The accompanying drawing explanation
Fig. 1 is the inventive example 1 flow process simplified schematic diagram.
Fig. 2 is the relative position schematic diagram of rotary kiln burner rich-oxygen nozzle of the present invention.
Fig. 3 is the inventive example 2 flow process simplified schematic diagram.
Fig. 4 is the inventive example 3 flow process simplified schematic diagram.
1. emergency stop devices in figure, 2. electric control gear, 3. air blast, 4. alarm control unit, 5. VPSA oxygen enrichment generating means, 6. oxygen enrichment regulation device, 7. oxygen enrichment pressure transmitter, 8. oxygen-rich concentration transmitter, 9. oxygen-rich stream transmitter, 10. controlling valve, 11. rich-oxygen preheater, 12. rich-oxygen nozzles, 13. rotary kiln burner, 14. rotary kiln, 15. the cement kiln tail dore furnace, the direction of rotation of 16. rotary kilns, the position line of 17. grogs in rotary kiln, 18. grog, the deviation angle α of 19. rich-oxygen nozzles and rotary kiln burner central vertical face.
Dotted arrow in figure is pull/control line of electricity.
The specific embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
In the flow process of the partial oxygenation combustion-supporting apparatus for the cement kiln energy-saving and emission-reduction simplified schematic diagram shown in Fig. 1, the outlet of VPSA oxygen enrichment generating means is connected with the oxygen enrichment import of oxygen enrichment regulation device, and the air intlet of this oxygen enrichment regulation device is connected with air blast.Be provided with the oxygen rich gas outlet on above-mentioned oxygen enrichment regulation device, it is connected with the import of rich-oxygen preheater oxygen enrichment by the oxygen therapy pipeline.Be respectively equipped with oxygen enrichment pressure transmitter, oxygen-rich concentration transmitter, oxygen-rich stream transmitter and controlling valve on this oxygen therapy pipeline.The smoke inlet of above-mentioned rich-oxygen preheater is connected with kiln tail high-temp waste gas, and the oxygen rich gas outlet is connected with rich-oxygen nozzle.This rich-oxygen nozzle has four groups, three groups of Lower Halves that are located at rotary kiln burner wherein, and wherein one group is located on the cement kiln tail dore furnace.In the relative position schematic diagram of the rotary kiln burner rich-oxygen nozzle shown in Fig. 2, open three groups of through holes on the kiln head cover Lower Half wall of rotary kiln burner, establish a sleeve pipe and this sleeve pipe in each through hole and stay 70-300mm outside the kiln head cover wall, establish 4-8 group through hole in this pipe surrounding symmetry, be welded with nut on hole, threaded connection bolt on it.Be built-in with rich-oxygen nozzle at above-mentioned sleeve pipe, both gaps are provided with asbestos cord.Rich-oxygen nozzle is the Lower Half that circular arc is arranged in rotary kiln burner, and departs from angle of rotary kiln direction of rotation, and this angle is directly proportional to rotary kiln rotating speed size, generally between 2-50 °.In Fig. 1, above-mentioned oxygen enrichment generating means, air blast, oxygen enrichment regulation device, oxygen enrichment pressure transmitter, oxygen-rich concentration transmitter, oxygen-rich stream transmitter, rotary kiln and cement kiln tail dore furnace all are connected by cable with electric control gear again.This electric control gear also is connected with warning device.Above-mentioned electric control gear also is connected with emergency stop device.
In the flow process of the partial oxygenation combustion-supporting apparatus for the cement kiln energy-saving and emission-reduction simplified schematic diagram shown in Fig. 3, the outlet of VPSA oxygen enrichment generating means is connected with the oxygen enrichment import of oxygen enrichment regulation device, and the air intlet of this oxygen enrichment regulation device is connected with air blast.Be provided with the oxygen rich gas outlet on above-mentioned oxygen enrichment regulation device, it is connected with the import of rich-oxygen preheater oxygen enrichment by the oxygen therapy pipeline.Be respectively equipped with oxygen enrichment pressure transmitter, oxygen-rich concentration transmitter, oxygen-rich stream transmitter and controlling valve on this oxygen therapy pipeline.The smoke inlet of above-mentioned rich-oxygen preheater is connected with the kiln hood high-temp waste gas, and the oxygen rich gas outlet is connected with rich-oxygen nozzle.This rich-oxygen nozzle has four groups, three groups of Lower Halves that are located at rotary kiln burner wherein, and wherein one group is located on the cement kiln tail dore furnace.In the relative position schematic diagram of the rotary kiln burner rich-oxygen nozzle shown in Fig. 2, open three groups of through holes on the kiln head cover Lower Half wall of rotary kiln burner, establish a sleeve pipe and this sleeve pipe in each through hole and stay 70-300mm outside the kiln head cover wall, establish 4-8 group through hole in this pipe surrounding symmetry, be welded with nut on hole, threaded connection bolt on it.Be built-in with rich-oxygen nozzle at above-mentioned sleeve pipe, both gaps are provided with asbestos cord.Rich-oxygen nozzle is the Lower Half that circular arc is arranged in rotary kiln burner, and departs from angle of rotary kiln direction of rotation, and this angle is directly proportional to rotary kiln rotating speed size, generally between 2-50 °.In Fig. 1, above-mentioned oxygen enrichment generating means, air blast, oxygen enrichment regulation device, oxygen enrichment pressure transmitter, oxygen-rich concentration transmitter, oxygen-rich stream transmitter, rotary kiln and cement kiln tail dore furnace all are connected by cable with electric control gear again.This electric control gear also is connected with warning device.Above-mentioned electric control gear also is connected with emergency stop device.
In the flow process of the partial oxygenation combustion-supporting apparatus for the cement kiln energy-saving and emission-reduction simplified schematic diagram shown in Fig. 4, the outlet of VPSA oxygen enrichment generating means is connected with the oxygen enrichment import of oxygen enrichment regulation device, and the air intlet of this oxygen enrichment regulation device is connected with air blast.Be provided with the oxygen rich gas outlet on above-mentioned oxygen enrichment regulation device, it is connected with the import of rich-oxygen preheater oxygen enrichment by the oxygen therapy pipeline.Be respectively equipped with oxygen enrichment pressure transmitter, oxygen-rich concentration transmitter, oxygen-rich stream transmitter and controlling valve on this oxygen therapy pipeline.The smoke inlet of above-mentioned rich-oxygen preheater is connected with kiln tail bypass high-temp waste gas, and the oxygen rich gas outlet is connected with rich-oxygen nozzle.This rich-oxygen nozzle has four groups, three groups of Lower Halves that are located at rotary kiln burner wherein, and wherein one group is located on the cement kiln tail dore furnace.In the relative position schematic diagram of the rotary kiln burner rich-oxygen nozzle shown in Fig. 2, open three groups of through holes on the kiln head cover Lower Half wall of rotary kiln burner, establish a sleeve pipe and this sleeve pipe in each through hole and stay 70-300mm outside the kiln head cover wall, establish 4-8 group through hole in this pipe surrounding symmetry, be welded with nut on hole, threaded connection bolt on it.Be built-in with rich-oxygen nozzle at above-mentioned sleeve pipe, both gaps are provided with asbestos cord.Rich-oxygen nozzle is the Lower Half that circular arc is arranged in rotary kiln burner, and departs from angle of rotary kiln direction of rotation, and this angle is directly proportional to rotary kiln rotating speed size, generally between 2-50 °.In Fig. 1, above-mentioned oxygen enrichment generating means, air blast, oxygen enrichment regulation device, oxygen enrichment pressure transmitter, oxygen-rich concentration transmitter, oxygen-rich stream transmitter, rotary kiln and cement kiln tail dore furnace all are connected by cable with electric control gear again.This electric control gear also is connected with warning device.Above-mentioned electric control gear also is connected with emergency stop device.
The present invention adopts VPSA oxygen enrichment generating means and embrane method to provide the performance comparison result of oxygen enrichment as follows:
The 2500 tons of cement kilns of take are example, choose oxygen enrichment flow 6900Nm
3/ hr, concentration 27(V) %, pressure 17KPa,
The relevant parameters contrast sees table:
As can be seen from the above table: the VPSA method is than the embrane method investment and energy consumption is lower, the oxygen enrichment quality better and the VPSA method is more ripe, scale is larger, and investment and the energy consumption of the embrane method that compares are lower.
Claims (7)
1. the partial oxygenation combustion-supporting apparatus for the cement kiln energy-saving and emission-reduction, it is characterized in that: the outlet of VPSA oxygen enrichment generating means is connected with the oxygen enrichment import of oxygen enrichment regulation device, the air intlet of this oxygen enrichment regulation device is connected with air blast, be provided with the oxygen rich gas outlet on above-mentioned oxygen enrichment regulation device, it is connected with the import of rich-oxygen preheater oxygen enrichment by the oxygen therapy pipeline, be respectively equipped with the oxygen enrichment pressure transmitter on this oxygen therapy pipeline, the oxygen-rich concentration transmitter, oxygen-rich stream transmitter and controlling valve, the smoke inlet of above-mentioned rich-oxygen preheater is connected with cement kiln high-temperature waste gas, and the oxygen rich gas outlet is connected with rich-oxygen nozzle, this rich-oxygen nozzle is located at the Lower Half of rotary kiln burner, above-mentioned oxygen enrichment generating means, air blast, the oxygen enrichment regulation device, the oxygen enrichment pressure transmitter, the oxygen-rich concentration transmitter, the oxygen-rich stream transmitter, rotary kiln all is connected by cable with electric control gear with the cement kiln tail dore furnace.
2. the partial oxygenation combustion-supporting apparatus for the cement kiln energy-saving and emission-reduction according to claim 1, is characterized in that: described cement kiln high-temperature waste gas or kiln hood high-temp waste gas, or kiln tail high-temp waste gas, or cement kiln bypass high-temp waste gas.
3. the partial oxygenation combustion-supporting apparatus for the cement kiln energy-saving and emission-reduction according to claim 2, it is characterized in that: the oxygen enrichment pipeline also is provided with a branch road, this branch road is provided with controlling valve and rich-oxygen preheater, and the end of branch road is connected with the rich-oxygen nozzle on being located at the cement kiln tail dore furnace.
4. according to the described partial oxygenation combustion-supporting apparatus for the cement kiln energy-saving and emission-reduction of claim 2 or 3, it is characterized in that: establish n group through hole on the kiln head cover Lower Half wall of rotary kiln burner, 1≤n≤8, establish a sleeve pipe and this sleeve pipe in each through hole and stay 70-300mm outside the kiln head cover wall, establish 4-8 group through hole in this pipe surrounding symmetry, be welded with nut on hole, threaded connection bolt on it, be built-in with rich-oxygen nozzle at above-mentioned sleeve pipe, both gaps are provided with asbestos cord.
5. the partial oxygenation combustion-supporting apparatus for the cement kiln energy-saving and emission-reduction according to claim 4, it is characterized in that: rich-oxygen nozzle is the downside that circular arc is arranged in rotary kiln burner, and depart from angle of rotary kiln direction of rotation, this angle is directly proportional to rotary kiln rotating speed size, generally, between 2-50 °, this circular arc must be in the Lower Half of rotary kiln burner simultaneously.
6. the partial oxygenation combustion-supporting apparatus for the cement kiln energy-saving and emission-reduction according to claim 1, it is characterized in that: electric control gear also is connected with warning device.
7. the partial oxygenation combustion-supporting apparatus for the cement kiln energy-saving and emission-reduction according to claim 1, it is characterized in that: electric control gear also is connected with emergency stop device.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103411420A (en) * | 2013-08-31 | 2013-11-27 | 魏伯卿 | Oxygen-rich partial oxygenation jet-flow combustion-supporting energy-saving emission-reducing system for rotary kiln |
| CN108680041A (en) * | 2018-05-21 | 2018-10-19 | 沈光林 | A kind of novel integrated energy-saving and emission-reduction volume increase for fuel stove puies forward acting type local oxygen enriching burning-aid system |
| CN110763018A (en) * | 2019-09-20 | 2020-02-07 | 沈忠东 | Decomposing furnace with local directional combustion supporting function |
| CN111306933A (en) * | 2020-02-24 | 2020-06-19 | 沈忠东 | Staged combustion method for saving coal and reducing nitrogen during combustion of rotary cement kiln |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103411420A (en) * | 2013-08-31 | 2013-11-27 | 魏伯卿 | Oxygen-rich partial oxygenation jet-flow combustion-supporting energy-saving emission-reducing system for rotary kiln |
| 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 |
| CN108680041A (en) * | 2018-05-21 | 2018-10-19 | 沈光林 | A kind of novel integrated energy-saving and emission-reduction volume increase for fuel stove puies forward acting type local oxygen enriching burning-aid system |
| CN110763018A (en) * | 2019-09-20 | 2020-02-07 | 沈忠东 | Decomposing furnace with local directional combustion supporting function |
| CN111306933A (en) * | 2020-02-24 | 2020-06-19 | 沈忠东 | Staged combustion method for saving coal and reducing nitrogen during combustion of rotary cement kiln |
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Application publication date: 20130626 |