CN102620563A - Annular sleeve kiln capable of realizing flameless combustion - Google Patents
Annular sleeve kiln capable of realizing flameless combustion Download PDFInfo
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- CN102620563A CN102620563A CN2012101041550A CN201210104155A CN102620563A CN 102620563 A CN102620563 A CN 102620563A CN 2012101041550 A CN2012101041550 A CN 2012101041550A CN 201210104155 A CN201210104155 A CN 201210104155A CN 102620563 A CN102620563 A CN 102620563A
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Abstract
The invention relates to an annular sleeve kiln capable of realizing flameless combustion, which belongs to the technical field of calcining equipment. An annular passage is formed among a kiln shell of the sleeve kiln, an upper inner sleeve and a lower inner sleeve, the outer circumference of the kiln shell is provided with upper combustion chambers and lower combustion chambers, gas nozzles are mounted at the outer ends of the upper combustion chambers and the lower combustion chambers respectively, the top end of the lower inner sleeve is closed, the lower end of the lower inner sleeve is provided with a recycle gas inlet, the upper end of the lower inner sleeve is provided with recycle gas outlet passages as same as the lower combustion chambers in number, an ejector nozzle is mounted on one side of each gas nozzle of the upper combustion chambers and the lower combustion chambers, each inner sleeve is provided with a cooling interlayer, flue gas at the upper end of the upper inner sleeve is discharged via a flue gas passage of a first heat exchanger and a second heat exchanger in serial connection, cooling air enters the cooling interlayer from the bottom of the lower inner sleeve prior to being subjected to heat exchange by the first heat exchanger, and is delivered to ejectors of the gas nozzles of the upper combustion chambers and the lower combustion chambers, and then fuel gas is delivered to the gas nozzles of the upper combustion chambers and the lower combustion chambers after being subjected to heat exchange of the second heat exchanger. By the aid of the annular sleeve kiln, flameless combustion conditions can be guaranteed to be established in the kiln so that flameless combustion can be truly realized.
Description
Technical field
The present invention relates to a kind of annular lime kiln, especially a kind of flameless combustion annular lime kiln belongs to the calciner technical field.
Background technology
The typical structure such as the US4431407 United States Patent (USP) of existing annular lime kiln are disclosed; Burning in this type of sleeve kiln combustion chamber is the diffusion type flaming combustion; The main drawback that exists has: tangible ligulate flame is arranged; Form the localized hyperthermia district easily, be prone to cause the burning phenomenon of combustion chamber and arch bridge refractory material; NOx in the flue gas, CO and hydrocarbon object height concentration-temperature district appear in chamber temperature skewness inevitably, cause the inabundant burning of fuel combustible component and the phenomenon of a large amount of discharge of poisonous waste things; The diffusion type flaming combustion relies on the flame propagation velocity and the balance of air velocity and the heat transfer of high temperature heat source and guarantees, makes fuel gas with low heat value such as pure blast furnace gas on the sleeve kiln, to use; Chemical reaction rate and calcination efficiency are low, and radiation effect is poor in the stove, so hear rate is high, and the energy waste phenomenon is serious.
In order to overcome above-mentioned drawback, application number is that 201110023248.6 one Chinese patent application has proposed a kind of flameless combustion annular lime kiln, forms the circular passage between its kiln shell and the upper and lower inner sleeve; The outer end, upper and lower combustion chamber of following inner sleeve is installed gas nozzle respectively; Gas nozzle exports on the combustion chamber of a side tangential injector is housed; Discharge behind heat exchanger the upper end of last inner sleeve, and lower ending opening is communicated with the circular passage; The upper end closed of following inner sleeve, lower end have the recyclegas inlet that is communicated with the circular passage; Injector has awl end drive air jet pipe and recyclegas inlet; The cooling sandwith layer lower end of following inner sleeve is communicated with the cooling air source, and the upper end leads to the fuel gas inlet of gas nozzle; The upper end of following inner sleeve leads to the recyclegas inlet of injector gas nozzle drive air jet pipe side through the recyclegas pipe.After adopting this technical scheme, can make chamber temperature even, improve calcination efficiency, and cut down the consumption of energy, reduce discharge of poisonous waste.
Because realizing aphlogistic primary condition is that anaerobic environment (oxygen content about 15%) and the preceding temperature of ignition mixture burning are higher than 650 ℃; And the gaseous mixture that gets into upper and lower combustion chamber in the above-mentioned patent application technical scheme does not reach desirable preheat temperature and anaerobic environment; Therefore be difficult to satisfy aphlogistic condition; Actual aphlogistic effect is unsatisfactory, and especially upper combustion chamber is all the more so.
Summary of the invention
The objective of the invention is to: be directed against the problem that above-mentioned prior art reflects in practice; Pipeline structure through to air, flue gas and gas burning system improves; Propose a kind ofly can realize aphlogistic annular lime kiln conscientiously, thereby reduce emission of harmful substances such as NOx, reduce anti-material scaling loss.
In order to achieve the above object, flameless combustion annular lime kiln of the present invention comprises the have upper and lower inner sleeve kiln shell (4) of (5,6), and said kiln shell (4) and upper and lower inner sleeve form the circular passage between (5,6); Cloth system (2) is equipped with in the upper end of said circular passage, and the lower end is communicated with ash hole (12); The outer circumference of said kiln shell (4) has upper and lower two rows upper combustion chamber (9) and lower combustion chamber (10) spaced apart; Said inner sleeve (6) down has the arch bridge (16) that refractory material is built into respectively with upper and lower combustion chamber (9,10), and the outer end of said upper and lower combustion chamber (9,10) is installed the gas nozzle (25,20) with fuel gas inlet respectively; The said top closure of inner sleeve (6) down, top has recyclegas exit passageway (21), and the lower end has the recyclegas inlet (15) that is communicated with the circular passage; Gas nozzle (25, a 20) side of said upper and lower combustion chamber (9,10) is equipped with the nozzles with injector (30,19) vertical with gas nozzle (25,20) direction respectively; Said upper and lower inner sleeve (5,6) has cooling sandwith layer; Its improvements are: said upper end of going up inner sleeve (5) leads to atmosphere behind the exhaust gases passes of first heat exchanger (23) of series connection and second heat exchanger (31); Cooling air inlet leads to the injector (28,26) of said upper and lower combustion chamber (9,10) gas nozzle (25,20) by after inner sleeve (6) bottom leads to said cooling sandwith layer down through first heat exchanger (23); Fuel gas inlet is led to the gas nozzle (25,20) of upper and lower combustion chamber (9,10) through second heat exchanger.
Said cooling air inlet is by after inner sleeve (6) bottom leads to said cooling sandwith layer down; Also lead to the gas nozzle (20) of said lower combustion chamber (10) through first heat exchanger (23), so be able to transport to lower combustion chamber (10) gas nozzle (20) as primary air through a part of fresh air after first heat exchanger (23) heat exchange.
Adopt like this, on the one hand rationally through the cooling sandwith layer preheating, again through first heat exchanger further the air after the intensification as injection combustion air and primary air; Then utilize fume afterheat on the other hand, make gas-preheating, thereby make the gaseous mixture that gets into upper and lower combustion chamber have suitable preheat temperature, thereby make ignition temperature enough high through second heat exchanger; On the other hand, the higher injection volume of air of temperature expands, and need not a large amount of air and just can satisfy required injection power requirement, thereby reduced the supply of oxygen; Therefore after adopting the present invention, can guarantee the foundation of flameless combustion condition in kiln, thereby realize flameless combustion conscientiously.
The present invention further improves: nozzles with injector (30) side of said upper combustion chamber (9) gas nozzle (25) one sides has injection return flow line (29); Therefore can be by ejector action; Make the high-temperature low-oxygen smoke backflow and the combustion gas mixing that form between kiln shell (4) and the following inner sleeve (6) in the circular passage, thus the oxygen content that more helps improving ignition temperature, reduces the preceding mixture of burning.
The present invention further improves again: the blast tube inwall in gas nozzle (25) the place ahead of said upper combustion chamber (9) is provided with protruding sawtooth brick (27), more helps combustion gas and Air mixing through the breakable layer laminar boundary layer, makes burning more abundant.
Description of drawings
Below in conjunction with accompanying drawing the present invention is further described.
Fig. 1 is the structural representation of one embodiment of the invention.
Fig. 2 is the broken section enlarged diagram of upper combustion chamber among Fig. 1.
Fig. 3 is a B-B section structure for amplifying sketch map among Fig. 2.
1 is truck among the figure; The 2nd, cloth system; The 4th, kiln shell; The 5th, last inner sleeve; The 6th, following inner sleeve; The 9th, upper combustion chamber; The 10th, lower combustion chamber; The 12nd, ash hole; The 13rd, kiln bed material storehouse; The 14th, ash hoist; The 15th, the recyclegas inlet; The 16th, arch bridge; The 17th, cooling-air duct; The 18th, following endless tube; The 30th, last nozzles with injector; The 28th, last injector; The 25th, last gas nozzle; The 21st, the recyclegas exit passageway; 23 is first heat exchangers; The 24th, last endless tube; The 20th, following gas nozzle; The 27th, the sawtooth brick; 31 is second heat exchangers; The 29th, the injection return flow line; The 19th, following nozzles with injector; The 26th, following injector; F2 is a roots blower; The F3 main smoke discharging blower fan.
The specific embodiment
Embodiment one
The flameless combustion annular lime kiln of present embodiment is as shown in Figure 1, have upper and lower inner sleeve 5,6 kiln shell 4 and upper and lower inner sleeve 5, form the circular passage between 6.The cloth system 2 of accepting truck 1 is equipped with in the upper end of this circular passage, and lower end one side is communicated with ash hole 12.The outer circumference of kiln shell 4 has upper and lower two rows upper combustion chamber 9 and lower combustion chamber 10 spaced apart.The outer end of upper and lower combustion chamber 9,10 is installed the gas nozzle 25,20 with fuel gas inlet respectively.The top closure of following inner sleeve 6, lower end have the recyclegas inlet 15 that is communicated with the circular passage, and top has the recyclegas exit passageway 21 with quantity with lower combustion chamber 10; Gas nozzle one side of upper and lower combustion chamber 9,10 is equipped with the nozzles with injector 30,19 (referring to Fig. 2) vertical with gas nozzle 25,20 directions respectively.Upper and lower inner sleeve 5,6 has cooling sandwith layer; Different with prior art is: the lower end of this interlayer is communicated with the cooling air source that roots blower F2 provides; The upper end does not directly lead to the fuel gas inlet of gas nozzle, but leads to first heat exchanger 23 behind cooling-air duct 17 and following endless tube 18.Therefore; The cooling air is under the effect of roots blower F2; Get into cooling sandwith layer by following inner sleeve 6 bottoms; Through 23 heat exchange of first heat exchanger, transport to the injector 28,26 of upper and lower combustion chamber 9,10 gas nozzles 25,20 again through distribution circuit, and transport to lower combustion chamber's 10 gas nozzles 20 as primary air.Therefore, can make the air and the primary air temperature that get into injector rise to 550 ℃, compared with prior art the injection air themperature has raise about 100 ℃, the primary air temperature raise about 350 ℃.The cooling air that roots blower F2 provides is both as cooling off the interlayer cooling medium of inner sleeve 6 down, the driven medium that also refluxes as upper and lower combustion chamber 9,10 injections.Because medium temperature has reached 200 ℃ before participating in heat exchange, therefore this fresh air temperature after 23 heat exchange of first heat exchanger will reach more than 550 ℃, enter into endless tube 24 then.The upper end of last inner sleeve 5 behind the exhaust gases passes of first heat exchanger 23 of series connection and horizontal tube bundle formula tubular heat exchanger 31 (i.e. second heat exchanger) by main smoke discharging blower fan F3 suction discharge.In addition, combustion gas after temperature rises to 250 ℃, is transported to the gas nozzle 25,20 of upper and lower combustion chamber 9,10 at first through 31 heat exchange of second heat exchanger through branch's fuel gas pipeline.
Other design feature of present embodiment such as Fig. 2, shown in Figure 3, nozzles with injector 30 sides of upper combustion chamber's 9 gas nozzles, 25 1 sides have injection return flow line 29, and the blast tube inwall in gas nozzle 25 the place aheads of upper combustion chamber 9 is provided with protruding sawtooth brick 27.
During work, after the cooling sandwith layer preheating of air in kiln of roots blower F2 input, through first heat exchanger 23 with from the kiln extracted out of inner sleeve 5 bottoms after the high-temp waste gas heat exchange; Temperature reaches more than 550 ℃; Spray in the injector 28 at a high speed from last nozzles with injector 30 as drive air, mix, form the combustion-supporting gas of oxygen content about 10% with the high-temperature flue gas more than 1100 ℃ of circulation through the return flow line; Under the effect of sawtooth brick 27 structures; Fully mix with the combustion gas that has initial temperature, realize the flameless combustion of high-temperature low-oxygen conscientiously, realize flameless combustion.
Facts have proved that present embodiment can be realized following effect: with 1Nm
3The combustion gas conversion, the gas composition that gets into lower combustion chamber's 10 reaction zones has: 1Nm
3Temperature is 250 ℃ combustion gas, 0.71Nm
3Temperature is that 550 ℃ of oxygen content are 21% injection gas, 0.26Nm
3Temperature is that 550 ℃ of oxygen content are 21% primary air, 2.51Nm
3Temperature is that 850 ℃ of oxygen content are 12% recyclegas, and therefore, the oxygen content of combustion air is 14.5% before lower combustion chamber's reaction zone burning, and the temperature of mixture is 651 ℃ before lower combustion chamber's reaction zone burning; The gas composition that gets into upper combustion chamber's reaction zone has: 1Nm
3Temperature is 250 ℃ combustion gas, 0.6Nm
3Temperature is that 550 ℃ of oxygen content are 21% injection air, 1.5Nm
3Temperature is that 1100 ℃ of oxygen content are 10% middle part burning zone backflow flue gas, and therefore, the oxygen content of combustion air is 13.1% before upper combustion chamber's 9 reaction zones burning, and the temperature of mixture is 719 ℃ before upper combustion chamber's reaction zone burning.Thereby upper and lower combustion chamber has all reached aphlogistic two necessary conditions of natural formation: the oxygen content of combustion air is lower than 15% before the burning of combustion chamber reaction zone, and the temperature of mixture is higher than 650 ℃ before the burning of combustion chamber reaction zone.
In a word; Because present embodiment has also been realized smoke backflow in upper combustion chamber, rationally utilize cooling sandwith layer and be provided with second heat exchanger, therefore effectively improved the initial temperature of combustion air and combustion gas; Reduced the consumption of drive air; Reduce replenishing of oxygen, properly settled the flameless combustion difficult problem of combustion chamber, had following remarkable advantage:
1. improve the temperature of the preceding mixture of combustion chamber reaction zone burning, and reduced the oxygen content of combustion air before the burning, realized the flameless combustion environment of upper and lower combustion chamber.
2. realize the abundant recovery of flue gas heat, improved the thermal efficiency of kiln, energy savings.
3. improved calcine technology in the kiln, improved the burner hearth mean temperature, guaranteed that the kiln temperature field distribution is even, avoided the formation in localized hyperthermia district, thereby improved calcination efficiency, and improved furnace service life.
4. the raising of mixture temperature makes its physics heat improve before the burning, and adoptable fuel value expanded range has realized the utilization of fuel gas with low heat value on annular lime kiln.
5. reduced NO
xEtc. emission of harmful substances.
Except that the foregoing description, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (5)
1. flameless combustion annular lime kiln comprises the have upper and lower inner sleeve kiln shell (4) of (5,6), and said kiln shell (4) and upper and lower inner sleeve form the circular passage between (5,6); Cloth system (2) is equipped with in the upper end of said circular passage, and the lower end is communicated with ash hole (12); The outer circumference of said kiln shell (4) has upper and lower two rows upper combustion chamber (9) and lower combustion chamber (10) spaced apart; Said inner sleeve (6) down has the arch bridge (16) that refractory material is built into respectively with upper and lower combustion chamber (9,10), and the outer end of said upper and lower combustion chamber (9,10) is installed the gas nozzle (25,20) with fuel gas inlet respectively; The said top closure of inner sleeve (6) down, top has recyclegas exit passageway (21), and the lower end has the recyclegas inlet (15) that is communicated with the circular passage; Gas nozzle (25, a 20) side of said upper and lower combustion chamber (9,10) is equipped with the nozzles with injector (30,19) vertical with gas nozzle (25,20) direction respectively; Said upper and lower inner sleeve (5,6) has cooling sandwith layer; It is characterized in that: said upper end of going up inner sleeve (5) leads to atmosphere behind the exhaust gases passes of first heat exchanger (23) of series connection and second heat exchanger (31); Cooling air inlet leads to the injector (28,26) of said upper and lower combustion chamber (9,10) gas nozzle (25,20) by after inner sleeve (6) bottom leads to said cooling sandwith layer down through first heat exchanger (23); Fuel gas inlet is led to the gas nozzle (25,20) of upper and lower combustion chamber (9,10) through second heat exchanger.
2. flameless combustion annular lime kiln according to claim 1; It is characterized in that: said cooling air inlet is by after inner sleeve (6) bottom leads to said cooling sandwith layer down; Get into endless tube (18) down; Behind first heat exchanger (23), get into again and go up endless tube (24), lead to the gas nozzle (20) of said lower combustion chamber (10) then.
3. flameless combustion annular lime kiln according to claim 1 and 2 is characterized in that: nozzles with injector (30) side of said upper combustion chamber (9) gas nozzle (25) one sides has injection return flow line (29).
4. flameless combustion annular lime kiln according to claim 3 is characterized in that: the blast tube inwall in gas nozzle (25) the place ahead of said upper combustion chamber (9) is provided with protruding sawtooth brick (27).
5. flameless combustion annular lime kiln according to claim 4 is characterized in that: said second heat exchanger (28) is a horizontal tube bundle formula tubular heat exchanger.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210104155.0A CN102620563B (en) | 2012-04-10 | 2012-04-10 | Annular sleeve kiln capable of realizing flameless combustion |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210104155.0A CN102620563B (en) | 2012-04-10 | 2012-04-10 | Annular sleeve kiln capable of realizing flameless combustion |
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| CN102620563B CN102620563B (en) | 2014-04-02 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940238A (en) * | 2014-05-14 | 2014-07-23 | 江苏中圣园科技股份有限公司 | Annular sleeve kiln |
| CN105157415A (en) * | 2015-09-01 | 2015-12-16 | 北京嘉永会通能源科技有限公司 | Annular shaft kiln |
| CN109574522A (en) * | 2018-12-25 | 2019-04-05 | 石家庄新华能源环保科技股份有限公司 | A kind of sleeve kiln combustion system |
| CN111592241A (en) * | 2020-05-28 | 2020-08-28 | 江苏中圣园科技股份有限公司 | Low NO for sleeve kilnxCombustion process and low NOxBurning sleeve kiln |
| CN112648613A (en) * | 2020-12-25 | 2021-04-13 | 江苏宇力节能科技有限公司 | Combustor for annular sleeve kiln lower combustion chamber and flameless combustion method |
| CN114216331A (en) * | 2022-02-22 | 2022-03-22 | 河北携海工程技术有限公司 | Internal combustion cross flow type sleeve kiln |
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| US4431407A (en) * | 1981-10-13 | 1984-02-14 | Ulrich Beckenbach | Process for burning limestone, dolomite or the like and annular shaft furnace for performing the same |
| CN2937979Y (en) * | 2006-06-28 | 2007-08-22 | 南京中圣园机电设备有限公司 | Ring-shaped sleeve kiln of burning low heat value gas |
| CN101476726A (en) * | 2009-01-14 | 2009-07-08 | 河北工业大学 | High-temperature low-oxygen combustor |
| CN201449130U (en) * | 2009-07-16 | 2010-05-05 | 南京中圣园机电设备有限公司 | Exhaust recirculating calcining kiln |
| CN102072648A (en) * | 2011-01-20 | 2011-05-25 | 江苏中圣园科技股份有限公司 | Flameless combustion annular sleeve kiln |
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Patent Citations (5)
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| US4431407A (en) * | 1981-10-13 | 1984-02-14 | Ulrich Beckenbach | Process for burning limestone, dolomite or the like and annular shaft furnace for performing the same |
| CN2937979Y (en) * | 2006-06-28 | 2007-08-22 | 南京中圣园机电设备有限公司 | Ring-shaped sleeve kiln of burning low heat value gas |
| CN101476726A (en) * | 2009-01-14 | 2009-07-08 | 河北工业大学 | High-temperature low-oxygen combustor |
| CN201449130U (en) * | 2009-07-16 | 2010-05-05 | 南京中圣园机电设备有限公司 | Exhaust recirculating calcining kiln |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940238A (en) * | 2014-05-14 | 2014-07-23 | 江苏中圣园科技股份有限公司 | Annular sleeve kiln |
| CN105157415A (en) * | 2015-09-01 | 2015-12-16 | 北京嘉永会通能源科技有限公司 | Annular shaft kiln |
| CN109574522A (en) * | 2018-12-25 | 2019-04-05 | 石家庄新华能源环保科技股份有限公司 | A kind of sleeve kiln combustion system |
| CN111592241A (en) * | 2020-05-28 | 2020-08-28 | 江苏中圣园科技股份有限公司 | Low NO for sleeve kilnxCombustion process and low NOxBurning sleeve kiln |
| CN112648613A (en) * | 2020-12-25 | 2021-04-13 | 江苏宇力节能科技有限公司 | Combustor for annular sleeve kiln lower combustion chamber and flameless combustion method |
| CN112648613B (en) * | 2020-12-25 | 2023-03-24 | 江苏宇力节能科技有限公司 | Combustor for annular sleeve kiln lower combustion chamber and flameless combustion method |
| CN114216331A (en) * | 2022-02-22 | 2022-03-22 | 河北携海工程技术有限公司 | Internal combustion cross flow type sleeve kiln |
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