CN104613752A - Secondary air oxygen-enrichment pulse combustion gas spraying device and method of rotary kiln - Google Patents
Secondary air oxygen-enrichment pulse combustion gas spraying device and method of rotary kiln Download PDFInfo
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- CN104613752A CN104613752A CN201510002906.1A CN201510002906A CN104613752A CN 104613752 A CN104613752 A CN 104613752A CN 201510002906 A CN201510002906 A CN 201510002906A CN 104613752 A CN104613752 A CN 104613752A
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- oxygen
- oxygen enrichment
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- 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
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Abstract
The invention relates to a secondary air oxygen-enrichment pulse combustion gas spraying device and method of a rotary kiln. The device comprises a plurality of oxygen-enrichment spray guns which are fixed to a kiln hood of the rotary kiln. The end, corresponding to the oxygen-enrichment spray guns, of the portion, located in a cooling zone, of a kiln lining is provided with air inlets of an oxygen-enrichment secondary air channel. Outlets of the oxygen-enrichment secondary air channel are formed in the inner wall of the portion, located in a firing zone, of the kiln lining. The kiln lining and the oxygen-enrichment secondary air channel are formed by pouring refractory castable integrally. The method comprises the steps that when the oxygen-enrichment spray guns and the oxygen-enrichment secondary air channel coincide, valves are opened to spray gas, and when the oxygen-enrichment spray guns are moved away from the oxygen-enrichment secondary air channel, the valves are closed, gun spraying is stopped, and then the oxygen-enrichment pulse combustion pulse process is completed. Compared with the prior art, the secondary air oxygen-enrichment pulse combustion gas spraying device and method of the rotary kiln have the advantages that through butt joint between the oxygen-enrichment spray guns and the oxygen-enrichment secondary air channel in the rotating process of the rotary kiln, oxygen-enriched air is supplied to the firing zone for after-combustion, the flow of the oxygen-enriched air is controllable, air supply is even, the oxygen-enriched air entering the kiln is fully preheated so that the combustion efficiency can be further improved, and the purposes of utilizing waste heat, eliminating pollution, saving energy and reducing emission are achieved.
Description
Technical field
The present invention relates to rotary kiln oxygen-enriched combustion technology field, particularly relate to the building materials such as a kind of cement, lime and agglomerates of sintered pellets rotary kiln Secondary Air oxygen enrichment pulse-combustion air jet system and method.
Background technology
At present, in the rotary kiln based on fire coal is produced, coal consumption accounts for the over half of whole production cost substantially, how to reduce the economic benefit that coal consumption is directly connected to manufacturing enterprise.Under natural conditions, burning needs consumption oxygen, in conventional combustion, air only has the oxygen of 20.9% to participate in combustion process, in air, the nitrogen of 78% then will absorb a large amount of combustion reaction liberated heat, and discharges as flue gas, causes serious environmental pollution and energy waste; Meanwhile, coal burns because anoxic can cause the thermal efficiency low in stove.
Oxygen-enriched combusting can improve the combustion conditions of fuel, improves flame temperature and blackness, shortens the time needed for fuel combustion, wider fuel range of choice can be obtained, realize the burning completely of fuel, thus strengthen flame to the radiant heat transfer ability of material in rotary kiln, improve the thermal efficiency of whole system; Reduce coefficient of excess air, reduce the discharge capacity of the pernicious gas such as waste gas and CO, NOx, be conducive to energy-saving and emission-reduction; The thermal regulation of whole rotary system can also be stablized simultaneously, improve production efficiency and the quality of product.
The traditional air supply mode of rotary kiln can be divided into following several: 1) coal wind: the wind of pulverized coal conveying; By the independent air feed of roots blower.2) First air: by kiln hood roots blower air feed, in burner nozzle place and coal dust mixed combustion, First air only accounts for 10 ~ 15% of rotary kiln fuel combustion supporting air.3) Secondary Air: from a part for grate-cooler material cooling air burns till product sensible heat and the pre-hot blast that obtains for cooling the product of burning till and absorbing.This part wind is drawn in rotary kiln by kiln tail negative pressure and participates in burning, is the main wind of rotary system fuel combustion; This part wind is to provide the combustion air of residual coke particle and unburnt volatile combustion in coal dust, provides heat simultaneously and supplements second-time burning at clinkering zone, make fuel after-flame to burning.Secondary Air deficiency can cause reducing atmosphere to produce, and will affect product quality.4) tertiary air: be the pre-hot blast from grate-cooler equally, this part wind does not enter kiln body and directly guides to dore furnace by the air-introduced machine of kiln tail from kiln head cover, mainly burns for dore furnace and provides heat to dore furnace.
Rotary kiln oxygen-enriched combusting generally adopts local oxygen enriching mode, adopts pure oxygen to be mixed to form oxygen-enriched air according to a certain percentage with air after reducing pressure and stablizing.The air distribution mode of rotary kiln oxygen-enriched combusting has three kinds: 1) First air oxygen enrichment, mixes with the First air through relative decrement with pure oxygen, accelerates coal dust firing; 2) Secondary Air oxygen enrichment, the oxygen-enriched air of high concentration and Secondary Air are mixed to form the combustion air of the oxygen-enriched content of requirement, to meet in coal dust residual coke particle and unburnt volatile matter at clinkering zone completely, Thorough combustion; For burning inferior coal, adopt oxygen enrichment Secondary Air even more important.3) tertiary air oxygen enrichment, delivers to dore furnace with a certain proportion of pure oxygen mixture tertiary air combustion-supporting.
As seen from the above analysis, realize rotary kiln inner second air oxygen enrichment and there is more importantly meaning.But because of the restriction of process conditions; mostly what current domestic rotary kiln adopted is First air and tertiary air oxygen-enriched burning process; along with the aggravation of global environment crisis and improving constantly of environmental requirement; exploitation has the oxygen-enriched combustion technology of independent intellectual property right, equipment has become the task of top priority with method, and apply pure oxygen, object that the method for oxygen enrichment pulse-combustion and flue gas recirculation burning more easily realizes energy-saving and emission-reduction, increases production and improves productivity.
Summary of the invention
The invention provides a kind of rotary kiln Secondary Air oxygen enrichment pulse-combustion air jet system and method, by oxygen enrichment spray gun and oxygen enrichment secondary air channel docking in rotary kiln rotary course, oxygen-enriched air is delivered to clinkering zone aftercombustion, oxygen-enriched air flow is controlled, air-supply evenly, the oxygen-enriched air entering kiln obtains abundant preheating, can further improve efficiency of combustion, and can reach the object of UTILIZATION OF VESIDUAL HEAT IN, energy-saving and emission-reduction.
In order to achieve the above object, the present invention realizes by the following technical solutions:
Rotary kiln Secondary Air oxygen enrichment pulse-combustion air jet system, comprise the several oxygen enrichment spray guns be fixed on rotary kiln head-shield, the salband kiln lining end that described oxygen enrichment spray gun spray nozzle is corresponding is provided with oxygen enrichment secondary air channel air inlet, and oxygen enrichment secondary air channel ejiction opening is located on clinkering zone kiln lining inwall.
Described oxygen enrichment spray gun evenly arranges 1 ~ 5 along kiln head cover top circumferencial direction, and spray gun spray nozzle is towards rotary kiln liner.
Described oxygen enrichment secondary air channel air inlet and oxygen enrichment spray gun spray nozzle are in same radius circumferentially, and quantity is 1 ~ 8 and evenly arranges.
Described oxygen enrichment secondary air channel is circular channel, and air inlet establishes the ellipse of band chamfering structure to introduce section; Middle air supply section and kiln body axis parallel longitudinal direction are arranged, ejection section becomes 30 ° ~ 60 ° angle Sloped rotatings to arrange with kiln body axis, and establish multiple ejiction opening, ejiction opening is towards Yao Ti center, and ejection section has the flat spout in slit deformation cross section narrowed in direction in kiln.
Described kiln lining and oxygen enrichment secondary air channel form by castable refractory is integrated poured.
The jet method of rotary kiln Secondary Air oxygen enrichment pulse-combustion air jet system, comprises the steps:
1) from the oxygen of pure oxygen preparation facilities or factory's oxygen pipe network by before Cemented filling to rotary kiln, decompression is carried out and voltage stabilizing according to coming oxygen pressure and purity, with rotary kiln combustion air oxygen-enriched content mixture on demand, the oxygen-enriched air that mixture is qualified delivers to oxygen enrichment spray gun by the road;
2) rotary kiln rotates by constant speed or frequency control, and oxygen enrichment spray gun is jet to timing valve opening with oxygen enrichment secondary air channel air inlet, and when removing, pass valve is held one's breath; When valve opening is jet, oxygen-enriched air is entered by oxygen enrichment secondary air channel air inlet, spray into clinkering zone by ejiction opening and participate in burning, open and close valve events is controlled to rotate with rotary kiln to realize automatic interlock action by rotary kiln, is realized to pulse supply oxygen enrichment in kiln by the alternating movement of open and close valve.
Reserved passageway when described oxygen enrichment secondary air channel is kiln lining cast, imbed in castable refractory with PVC hard plastic tube by the quantity set and position when rotary kiln liner is constructed, at the setting oxygen enrichment nozzle of clinkering zone by PVC hard plastic tube with set angle to the centroclinal rotation of kiln body, and along inclined direction flatten gradually, during rotary kiln baker, the fusing of PVC hard plastic tube is burnt and is namely become oxygen enrichment secondary air channel.
Compared with prior art, the invention has the beneficial effects as follows:
1) by oxygen enrichment spray gun and oxygen enrichment secondary air channel, oxygen-enriched air is delivered to clinkering zone and participate in burning, make residual coke particle and unburnt volatile matter Thorough combustion and after-flame in coal dust;
2) bring high temperature gases recirculating during oxygen enrichment spray gun injection into in kiln, be conducive to UTILIZATION OF VESIDUAL HEAT IN;
3) oxygen-enriched air obtains abundant preheating in oxygen enrichment secondary air channel, can further improve efficiency of combustion;
4) oxygen enrichment spray gun corresponding kiln body even circumferential is arranged, air flow rate is even, and flow is controlled;
5) form the pulse supply of oxygen enrichment when single oxygen enrichment spray gun is set, when multiple oxygen enrichment spray gun is set, semicontinuous supply oxygen enrichment in kiln can be realized;
6) oxygen-enriched combusting can make coal dust firing complete, and pollution abatement, realizes energy-saving and emission-reduction, and ensures the safe and stable operation of rotary kiln.
Accompanying drawing explanation
Fig. 1 is the front view of device of the present invention.(locally)
Fig. 2 is the A direction view of Fig. 1.
Fig. 3 is the I portion enlarged drawing in Fig. 1.
Fig. 4 a is the schematic diagram of oxygen enrichment secondary air channel air inlet when horizontal axis direction is docked with oxygen enrichment spray gun.
Fig. 4 b is the schematic diagram of oxygen enrichment secondary air channel air inlet when vertical axis direction is docked with oxygen enrichment spray gun.
In figure: 1. rotary kiln 2. kiln head cover 3. oxygen enrichment spray gun 4. kiln lining 5. oxygen enrichment secondary air channel 51. air inlet 52. section of introducing 53. air supply section 54. section of ejection 55. ejiction opening
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
Seeing Fig. 1-Fig. 3, is the structural representation of device of the present invention.Rotary kiln Secondary Air oxygen enrichment pulse-combustion air jet system of the present invention, comprise the several oxygen enrichment spray guns 3 be fixed on rotary kiln head-shield 2, salband kiln lining 4 end that described oxygen enrichment spray gun 3 shower nozzle is corresponding is provided with oxygen enrichment secondary air channel air inlet 51, and oxygen enrichment secondary air channel ejiction opening 55 is located on clinkering zone kiln lining 4 inwall.
Described oxygen enrichment spray gun 3 evenly arranges 1 ~ 5 along kiln head cover 2 circumferencial direction, and spray gun spray nozzle is towards rotary kiln liner 4.
Described oxygen enrichment secondary air channel air inlet 51 is in same radius circumferentially with oxygen enrichment spray gun 3 shower nozzle, and quantity is 1 ~ 8 and evenly arranges.
Described oxygen enrichment secondary air channel 5 is circular channel, and air inlet 51 place establishes the ellipse of band chamfering structure to introduce section 52; Middle air supply section 53 is arranged with kiln body axis parallel longitudinal direction, ejection section 54 becomes 30 ° ~ 60 ° angle Sloped rotatings to arrange with kiln body axis, and establish multiple ejiction opening 55, ejiction opening 55 is towards Yao Ti center, and ejection section 54 has the flat spout in slit deformation cross section narrowed in direction in kiln.
Described kiln lining 4 and oxygen enrichment secondary air channel 5 form by castable refractory is integrated poured.
The jet method of rotary kiln Secondary Air oxygen enrichment pulse-combustion air jet system, comprises the steps:
1) from the oxygen of pure oxygen preparation facilities or factory's oxygen pipe network by before Cemented filling to rotary kiln 1 kiln, decompression is carried out and voltage stabilizing according to coming oxygen pressure and purity, with rotary kiln combustion air oxygen-enriched content mixture on demand, the oxygen-enriched air that mixture is qualified delivers to oxygen enrichment spray gun 3 by the road;
2) rotary kiln 1 rotates by constant speed or frequency control, and oxygen enrichment spray gun 3 is jet with oxygen enrichment secondary air channel air inlet 51 pairs of timing valve opening, closes valve and hold one's breath when removing; When valve opening is jet, oxygen-enriched air is entered by oxygen enrichment secondary air channel air inlet 51, spray into clinkering zone by ejiction opening 55 and participate in burning, open and close valve events is controlled to rotate with rotary kiln 1 to realize automatic interlock action by rotary kiln, is realized to pulse supply oxygen enrichment in kiln by the alternating movement of open and close valve.
Described oxygen enrichment secondary air channel 5 is the reserved passageway of kiln lining 4 when pouring into a mould, imbed in castable refractory with PVC hard plastic tube by the quantity set and position when rotary kiln liner 4 is constructed, at the setting oxygen enrichment nozzle of clinkering zone by PVC hard plastic tube with set angle to the centroclinal rotation of kiln body, and along inclined direction flatten gradually, during rotary kiln 1 baker, the fusing of PVC hard plastic tube is burnt and is namely become oxygen enrichment secondary air channel 5.
Secondary Air is clinkering zone aftercombustion in rotary kiln 1, makes fuel after-flame, wherein may be attended by micro-combustible component, and therefore Secondary Air oxygen enrichment delivers to clinkering zone in kiln after will mixing ratio outside kiln; Rotary kiln 1 periodically rotates by constant speed or frequency control, therefore oxygen enrichment spray gun 3 can be fixed on top or the side of kiln head cover 2, and can along the circumferential direction evenly arrange multiple, when it docks with the reserved oxygen enrichment secondary air channel 5 on kiln lining 4, valve opening is jet, close valve when removing to hold one's breath, namely complete pulse Rich Oxygen Combustion.
The present invention may be used for the multiple rotary kiln device such as lime rotary kiln, agglomerates of sintered pellets rotary kiln and chemical industry rotary kiln, single spraying rifle arranges and can form pulse supply oxygen enrichment to rotary kiln 1, many spray guns arrange the semicontinuous supply oxygen enrichment that then can realize rotary kiln 1 burning process, and ensure that the safe and stable operation of system to greatest extent.The present invention simultaneously realizes the accurate control to rotary kiln Secondary Air by detecting and controlling system, and solving rotary kiln Secondary Air for a long time cannot the difficult problem of quantified controlling.
Oxygen enrichment spray gun 3 sprays in the process of oxygen enrichment at aligning oxygen enrichment secondary air channel 5, can be stirred the high-temperature flue gas of overflowing in the kiln in kiln head cover 2 and the cooling wind be preheated by ejector action, injection is brought partial fume and cooling wind and oxygen enrichment into and is mixed into clinkering zone simultaneously.Realize part smoke backflow in this process in kiln, be conducive to reducing oxidization burning loss and reduce NOx producing, recovery waste heat to greatest extent, and high-temp waste gas reduction of discharging can be realized.
As shown in fig. 4 a, be the schematic diagram of oxygen enrichment secondary air channel air inlet 51 when docking with oxygen enrichment spray gun 3 when being in horizontal axis direction.See Fig. 2, oxygen enrichment spray gun 3 is fixed on the side of rotary kiln head-shield 2, along with kiln body rotates, oxygen enrichment secondary air channel air inlet 51 aligns with the shower nozzle of oxygen enrichment spray gun 3, checkout gear sends signal to control system, control system controls the valve open of the oxygen enrichment conveyance conduit being communicated with oxygen enrichment spray gun 3, and the multiple ejiction openings 55 of oxygen-enriched air on oxygen enrichment secondary air channel 5 spray into clinkering zone and participate in burning.When kiln body continues to rotate, when oxygen enrichment secondary air channel air inlet 51 removes dislocation with the shower nozzle of oxygen enrichment spray gun 3, checkout gear sends signal to control system, and control system controls the valve closing of the oxygen enrichment conveyance conduit being communicated with oxygen enrichment spray gun 3, stops jet.As shown in Figure 4 b, be the schematic diagram of oxygen enrichment secondary air channel air inlet 51 when docking with oxygen enrichment spray gun 3 when being in vertical axis direction.It is identical with the principle that oxygen enrichment spray gun 3 docks when its operation principle and oxygen enrichment secondary air channel air inlet 51 are in horizontal axis direction.
Claims (7)
1. rotary kiln Secondary Air oxygen enrichment pulse-combustion air jet system, it is characterized in that, comprise the several oxygen enrichment spray guns be fixed on rotary kiln head-shield, the salband kiln lining end that described oxygen enrichment spray gun spray nozzle is corresponding is provided with oxygen enrichment secondary air channel air inlet, and oxygen enrichment secondary air channel ejiction opening is located on clinkering zone kiln lining inwall.
2. rotary kiln Secondary Air oxygen enrichment pulse-combustion air jet system according to claim 1, it is characterized in that, described oxygen enrichment spray gun evenly arranges 1 ~ 5 along kiln head cover top circumferencial direction, and spray gun spray nozzle is towards rotary kiln liner.
3. rotary kiln Secondary Air oxygen enrichment pulse-combustion air jet system according to claim 1, it is characterized in that, described oxygen enrichment secondary air channel air inlet and oxygen enrichment spray gun spray nozzle are in same radius circumferentially, and quantity is 1 ~ 8 and evenly arranges.
4. rotary kiln Secondary Air oxygen enrichment pulse-combustion air jet system according to claim 1, it is characterized in that, described oxygen enrichment secondary air channel is circular channel, and air inlet establishes the ellipse of band chamfering structure to introduce section; Middle air supply section and kiln body axis parallel longitudinal direction are arranged, ejection section becomes 30 ° ~ 60 ° angle Sloped rotatings to arrange with kiln body axis, and establish multiple ejiction opening, ejiction opening is towards Yao Ti center, and ejection section has the flat spout in slit deformation cross section narrowed in direction in kiln.
5. rotary kiln Secondary Air oxygen enrichment pulse-combustion air jet system according to claim 1, it is characterized in that, described kiln lining and oxygen enrichment secondary air channel form by castable refractory is integrated poured.
6. the jet method of rotary kiln Secondary Air oxygen enrichment pulse-combustion air jet system according to claim 1, is characterized in that, comprise the steps:
1) from the oxygen of pure oxygen preparation facilities or factory's oxygen pipe network by before Cemented filling to rotary kiln, decompression is carried out and voltage stabilizing according to coming oxygen pressure and purity, with rotary kiln combustion air oxygen-enriched content mixture on demand, the oxygen-enriched air that mixture is qualified delivers to oxygen enrichment spray gun by the road;
2) rotary kiln rotates by constant speed or frequency control, and oxygen enrichment spray gun is jet to timing valve opening with oxygen enrichment secondary air channel air inlet, and when removing, pass valve is held one's breath; When valve opening is jet, oxygen-enriched air is entered by oxygen enrichment secondary air channel air inlet, spray into clinkering zone by ejiction opening and participate in burning, open and close valve events is controlled to rotate with rotary kiln to realize automatic interlock action by rotary kiln, is realized to pulse supply oxygen enrichment in kiln by the alternating movement of open and close valve.
7. rotary kiln Secondary Air oxygen enrichment pulse-combustion jet method according to claim 6, it is characterized in that, reserved passageway when described oxygen enrichment secondary air channel is kiln lining cast, imbed in castable refractory with PVC hard plastic tube by the quantity set and position when rotary kiln liner is constructed, at the setting oxygen enrichment nozzle of clinkering zone by PVC hard plastic tube with set angle to the centroclinal rotation of kiln body, and along inclined direction flatten gradually, during rotary kiln baker, the fusing of PVC hard plastic tube is burnt and is namely become oxygen enrichment secondary air channel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510002906.1A CN104613752B (en) | 2015-01-05 | 2015-01-05 | Rotary kiln secondary wind oxygen-enriched pulse-combustion air jet system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510002906.1A CN104613752B (en) | 2015-01-05 | 2015-01-05 | Rotary kiln secondary wind oxygen-enriched pulse-combustion air jet system and method |
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| CN104613752A true CN104613752A (en) | 2015-05-13 |
| CN104613752B CN104613752B (en) | 2016-08-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108302932A (en) * | 2018-01-16 | 2018-07-20 | 中钢集团鞍山热能研究院有限公司 | A kind of horizontal air duct structure of carbon-calcining rotary kiln |
| CN111910071A (en) * | 2020-09-11 | 2020-11-10 | 黄湛明 | Grate-rotary kiln pellet low NOx production system |
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| JP2004003738A (en) * | 2002-05-31 | 2004-01-08 | Tsukishima Kikai Co Ltd | External heat kiln and thermal decomposition treatment method for material treated by external heat kiln |
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| CN103090665A (en) * | 2012-11-30 | 2013-05-08 | 沈光林 | Partial oxygenation combustion-supporting device and method for rotary kiln |
| CN104197696A (en) * | 2014-09-11 | 2014-12-10 | 烟台九州环保节能科技有限公司 | Oxygen-enriched combustion-supporting and pulverized coal pure-oxygen compensation energy conservation system of rotary kiln |
| CN204438754U (en) * | 2015-01-05 | 2015-07-01 | 中钢集团鞍山热能研究院有限公司 | Rotary kiln Secondary Air oxygen enrichment pulse-combustion air jet system |
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2015
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2004003738A (en) * | 2002-05-31 | 2004-01-08 | Tsukishima Kikai Co Ltd | External heat kiln and thermal decomposition treatment method for material treated by external heat kiln |
| CN201103897Y (en) * | 2007-07-18 | 2008-08-20 | 王延明 | Thoroughly cleaning combustion device |
| CN103090665A (en) * | 2012-11-30 | 2013-05-08 | 沈光林 | Partial oxygenation combustion-supporting device and method for rotary kiln |
| CN104197696A (en) * | 2014-09-11 | 2014-12-10 | 烟台九州环保节能科技有限公司 | Oxygen-enriched combustion-supporting and pulverized coal pure-oxygen compensation energy conservation system of rotary kiln |
| CN204438754U (en) * | 2015-01-05 | 2015-07-01 | 中钢集团鞍山热能研究院有限公司 | Rotary kiln Secondary Air oxygen enrichment pulse-combustion air jet system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108302932A (en) * | 2018-01-16 | 2018-07-20 | 中钢集团鞍山热能研究院有限公司 | A kind of horizontal air duct structure of carbon-calcining rotary kiln |
| CN111910071A (en) * | 2020-09-11 | 2020-11-10 | 黄湛明 | Grate-rotary kiln pellet low NOx production system |
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