CN101776277B - Method and device for improving heat efficiency of combustion furnace by oxygen-rich partial oxygen-enriched jet flow combustion supporting - Google Patents
Method and device for improving heat efficiency of combustion furnace by oxygen-rich partial oxygen-enriched jet flow combustion supporting Download PDFInfo
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- CN101776277B CN101776277B CN2010101154507A CN201010115450A CN101776277B CN 101776277 B CN101776277 B CN 101776277B CN 2010101154507 A CN2010101154507 A CN 2010101154507A CN 201010115450 A CN201010115450 A CN 201010115450A CN 101776277 B CN101776277 B CN 101776277B
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- oxygen
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- rich gas
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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
Abstract
The invention discloses a method for improving the heat efficiency of a combustion furnace by oxygen-rich partial oxygen-enriched jet flow combustion supporting, which comprises the following steps of: introducing a fuel and an oxygen-rich gas into the combustion furnace respectively; and gathering the fuel and the oxygen-rich gas together for combustion, wherein the oxygen-rich gas is pressurized first, then is jetted into a fuel flow area at a linear velocity which is 1.2 to 4.0 times the flow velocity of the fuel by forming an included angle of 10 to 45 degrees with the jetted fuel, and is mixed with the fuel for combustion, and the entering position of the oxygen-rich gas is an area which is between the top end of a combustion flame and a jet tip and is 1/4 to 4/2 away from the jet tip of a fuel nozzle. The invention also provides a device for improving the heat efficiency of the combustion furnace by the oxygen-rich partial oxygen-enriched jet flow combustion supporting. The method and the device has the following advantages that: by using a special oxygen-rich jet flow nozzle and a heat radiation principle, not only the duel energy-saving efficiencies of reducing the combustion-supporting air volume and completely combusting the fuel are kept, but also the temperature of a combustion flame area can be raised to the utmost extent, so the flue gas heat radiation is improved to the utmost extent.
Description
Technical field
The present invention relates to method and device thereof that combustion furnace by oxygen-rich partial oxygen-enriched jet flow combustion supporting improves the thermal efficiency; Be applicable to various fuel and all kilns; Like the Industrial Boiler of fuel-firing gas-firing, heating furnace, smelting furnace, ceramic kiln, glass furnace, cement kiln etc., belong to the synthetic energy-saving discharge-reducing technical field.
Background technology
At present general kiln all adopts normal air combustion-supporting, owing to only contain 20.93% oxygen in the air, all the other are inert gas, and these inert gases are not only not combustion-supporting, absorb great amount of heat on the contrary, reduce the performance and the efficient of kiln greatly.
The present domestic Shen Guanglin of having etc. applied for the patent (CN97104465.1, CN00110217.6, CN02281418.3, CN200420004099.4, CN200420014005.1) of local oxygen enriching burning-aid; Shen Bo (CN101487593A) and Wei Baiqing (200920023792.9,200920195965.5,200920195812.0,200920195966.X) also applied for the improvement patent of the energy-conservation and device of local oxygen enriching burning-aid in addition; But these patents all are from practical application, to consider a problem, not from improving the essence of the thermal efficiency---and improve radiation efficiency and deal with problems:
1, these patents only pay attention to utilizing state-of-the-art embrane method oxygenerating technology to obtain the oxygen rich gas of 30% left and right sides concentration; The instead of part combustion air is to reduce intake; Thereby reduce the heat that inert gas is taken away, promote burning to reach energy-conservation fully thereby consider to improve oxygen content simultaneously; But not more consideration fullest utilizes these limited oxygen enrichment resources to increase the method for its radiation efficiencies.
2, adopt common oxygen jet; Debugging apparatus is not set; And the position of oxygen jet and angle are the factors that local oxygen enriching burning-aid improves the energy-saving efficiency most critical, therefore, do not have adjustable debugging apparatus just can not oxygen-rich gas nozzle be transferred to best position and angle.
3, position, angle and the linear velocity of oxygen rich gas entering flame area are not right: at present oxygen rich gas is sent into the combustion flame center; And have only the several years with the angle of fuel nozzle; And the linear velocity of oxygen rich gas is relatively low again; This can not make oxygen rich gas really be sent to the combustion flame most critical zone; Thereby the length that therefore also just can not shorten combustion flame well prolongs the time of staying of combustion product gases in burner hearth, more can not improve the regional temperature of flame to greatest extent, thereby improve radiation efficiency to greatest extent.
4, debugging is unscientific fully by rule of thumb: though also there are not computational methods can calculate the optimum position and the angle of oxygen-rich gas nozzle design now; But burning is very complicated chemical process; And the point for measuring temperature of any its former setting of combustion furnace is very limited; And do not have relatedly with burner hearth heat radiation and distribution thereof, therefore, the position and the angle that by experience nozzle are set fully are unscientific.By infrared radiation thermometer; Selection comprises tens points for measuring temperature such as each section of heated medium pipe outer wall and each zone of combustion flame, under the temperature-resistant condition that guarantees each district of heated medium pipe outer wall, utilizes heat radiation theory and fluidics; Oxygen enrichment jet nozzle through special use; Turn the fuel supply flow as far as possible down, adjust the relative position and the angle of oxygen-rich gas nozzle and fuel nozzle simultaneously, to improve the regional temperature of combustion flame to greatest extent; Thereby improve the flue gas radiation efficiency, and then maximum raising oxygen-enriched combustion-supporting energy-saving efficiency.
Summary of the invention
A kind ofly can overcome above-mentioned deficiency and utilize the heat radiation theory and fluidics improves the method that combustion furnace by oxygen-rich partial oxygen-enriched jet flow combustion supporting that combustion flame temperature improves combustion heat radiation efficiency improves the thermal efficiency thereby the purpose of this invention is to provide, corresponding device thereof also is provided.
Combustion furnace by oxygen-rich partial oxygen-enriched jet flow combustion supporting improves the method for the thermal efficiency; Comprising that oxygen rich gas is injected in through fuel nozzle with fuel through oxygen-rich gas nozzle burns; It is characterized in that; Angle angle between oxygen-rich gas nozzle and the fuel nozzle is 10 °～45 °; The linear velocity of oxygen rich gas is 1.2～4.0 times of fuel line speed, and oxygen rich gas is sent between the spout of combustion flame top and fuel nozzle distance near the position between the fuel nozzle spout 1/4th to 2/4ths.
Because above-mentioned improvement; Combustion centre's fuel is mixed with oxygen rich gas fully and the combustion-supporting oxygen with abundance; Thereby make combustion centre be in high oxygen combustion and improved the ignition temperature of combustion centre significantly; The temperature of radiation chamber can improve more than 20 ℃ in the tubular heater, so its thermal efficiency is higher, and its theoretical foundation is following:
Tubular heater commonly used, whole reheat furnace system mainly is made up of radiation chamber, convection cell and air preheater; In radiation chamber high-temperature flue gas mainly with thermal-radiating mode with the heat transferred radiant tube, the radiant heat transfer in the radiation chamber account for radiation chamber total conduct heat about 90%, remaining heat transfer of about 10% is to pass to radiant tube by high-temperature flue gas with the mode of convection current; Heated medium accounts for more than 70% of total heat-obtaining amount in the heat-obtaining amount of radiation chamber.
Theoretical according to heat radiation: radiant heat Q=KH (T1
4-T2
4),
Wherein: K is a heat emissivity coefficient, is a constant for same combustion furnace;
H is a flame blackness, and the good more H value of combustion efficiency is big more;
T1 is the mean temperature of its radiation chamber of heating furnace;
T2 is the mean temperature of heat medium at radiation chamber.
The mean temperature of supposing certain its radiation chamber of heating furnace is 700 ℃, and heat medium is 360 ℃ in the mean temperature of radiation chamber; Ordinary circumstance is utilized the present invention can improve combustion flame temperature to reach more than 20 ℃, and the mean temperature of its radiation chamber is 720 ℃ behind the oxygen enrichment jet combustion supporting, and then its radiation efficiency can improve:
Behind the Q/Q before=[H2 (720
4-360
4)]/[H1 (700
4-360
4)]
＝1.1282H2/H1＞1.1282
H2 is greater than H1 after using oxygen enrichment, therefore, and behind the Q/be greater than 1.1282 before the Q; That is to say that its radiation efficiency will improve 12.82% at least, this conducts heat for heat radiation and accounts for the heating furnace of total media heat-obtaining amount more than 60%, and the raising of its integrated heat efficiency is very considerable.This is consistent with experimental result: the raising of its integrated heat efficiency of fuel oil experiment can reach calculates 25.4%～40.7% of radiation efficiency raising value, and the combustion gas experiment reaches 21.1%～33.5%, and the raising of flame zone temperature reaches 18～29 ℃.
Also regulate the fuel quantity that (mainly being to reduce) gets into the combustion zone through the temperature in test fuel zone.If do not reduce the supply of fuel; The temperature of heated medium pipe outer wall just correspondingly improves around the combustion flame; Not changing the arranged distribution structure of burner hearth fuel nozzle and heated medium pipe etc. because system of the present invention only through special-purpose oxygen enrichment jet nozzle oxygen rich gas is sent into combustion centre, is that the heat exchange pattern led is constant with the heat radiation so add before and after the oxygen enrichment flue gas in the burner hearth; (is starting point with Fire Radiation to heated medium pipe outer wall minimum distance point to measure each regional temperature of heated medium pipe outer wall by infrared radiation thermometer; Get a thermometric along the every approximately 50CM of each heat medium pipe); And the control valve of fuel metering supply pipe; Reduce the supply flow of fuel; The temperature of each point for measuring temperature of heated medium pipe outer wall reached and add basically identical before the oxygen enrichment, this moment combustion centre the temperature ratio add oxygen enrichment before combustion centre's temperature generally to exceed more than 20 ℃, so the radiation efficiency of flue gas improves very big in the burner hearth.
Correspondingly; The present invention also provides corresponding combustion furnace to improve the device of the thermal efficiency according to said method; Comprise oxygen concentration device and fuel injection device; Also comprise gas pressurized device, gas pressurized device connects oxygen-rich gas nozzle, and the fuel nozzle angle angle of oxygen-rich gas nozzle and fuel injection device is 10.(fuel is thick more, fuel nozzle is bigger, combustion position is poor more, combustion flame is long more for 45 ° angle; The angle of special-purpose jet nozzle of its oxygen rich air and fuel nozzle is just big more); Oxygen rich gas gets into combustion flame (being that fuel nozzle ports arrives the flame top zone) near between fuel nozzle spout 1/4th to 2/4ths zones with linear velocity (fuel is thick more, fuel nozzle is bigger, combustion position is poor more, combustion flame is long more, and the speed ratio of its oxygen rich gas and fuel flow rate the is big more) jet of 1.2～4.0 times of fuel flow rates.
Infrared radiation thermometer also is set, when the burning flow is set, by infrared radiation thermometer in fuel injection device; Selection comprises tens points for measuring temperature such as each section of heated medium pipe outer wall and each zone of combustion flame, under the temperature-resistant condition that guarantees each district of heated medium pipe outer wall, through fuel flow control valve; Turn the fuel supply flow down; The oxygen-rich gas nozzle micromatic setting also is set on oxygen-rich gas nozzle simultaneously, and the angle of adjustment oxygen-rich gas nozzle and fuel nozzle is to improve the regional temperature of combustion flame to greatest extent; Thereby improve the flue gas radiation efficiency, and then maximum raising oxygen-enriched combustion-supporting energy-saving efficiency.The temperature of general combustion centre could improve and reaches tens degree even spend 100 more if do not reduce the supply flow of fuel! Therefore; When turning the fuel supply flow down; Measure each regional temperature of heated medium pipe outer wall by infrared radiation thermometer, with guarantee to add behind the oxygen-enriched combustion-supporting with the stove that adds before the oxygen-enriched combustion-supporting in heated medium process conditions basically identical and reach optimum energy-saving effect.
The present invention compared with prior art has the following advantages:
Utilize special-purpose oxygen enrichment jet nozzle and heat radiation principle, can not only keep reducing combustion air volume and make outside the complete dual energy-saving efficiency of fuel combustion, and can also improve the flame area temperature to greatest extent, thereby improve the flue gas heat radiation to greatest extent.
Help by infrared radiation thermometer; The temperature of each section of the heated medium pipe outside with add oxygen enrichment before under the consistent condition; Regulate the angle and the fuel flow rate of oxygen-rich gas nozzle and fuel nozzle; Make the regional temperature of combustion flame bring up to maximum, thereby can improve radiation efficiency to greatest extent.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention;
Fig. 2 is the structural representation of middle oxygen-rich gas nozzle embodiment illustrated in fig. 1 and fuel nozzle relative position;
Fig. 3 is a middle nozzle micromatic setting structural representation embodiment illustrated in fig. 1.
Among the figure: 1; Filter cotton 2; High efficiency particle air filter 3; Air-supply arrangement 4; Oxygen permeable membrane device 5; Vavuum pump 6; Gas and water separator 7; Gas pressurized device 8; Oxygen enrichment preheater 9; Oxygen rich gas distributor 10; Control valve 11; Nozzle micromatic setting 12; Oxygen-rich gas nozzle 13; Fuel nozzle 14; Combustion furnace 15; The angle 16 of oxygen-rich gas nozzle and fuel nozzle; Combustion flame 17; Infrared radiation thermometer 18; Heated medium pipe 19; Becket 20; Center support ring 21; A plurality of adjusting bolts 22; Oxygen-rich gas nozzle pipe 23; Fuel flow control valve
The specific embodiment
In the embodiment shown in Fig. 1-3: filter cotton 1 is fixed on the inlet of high efficiency particle air filter 2; Air-supply arrangement 3 is connected between the outlet and oxygen permeable membrane device 4 of high efficiency particle air filter 2; The outlet of oxygen permeable membrane device 4 connects gas pressurized device 7 through vavuum pump 5, gas and water separator 6 successively; Gas pressurized device 7 is a booster pump; Gas pressurized device 7 outlets connect the inlet of oxygen enrichment preheater 8; The outlet of oxygen enrichment preheater 8 connects oxygen rich gas distributor 9, and each outlet line of oxygen rich gas distributor 9 all is equipped with control valve 10, and each control valve 10 all connects a nozzle micromatic setting 11 and corresponding oxygen-rich gas nozzle 12; The bilateral symmetry of each fuel nozzle 13 is provided with two oxygen-rich gas nozzles 12 on the combustion furnace 14; Each oxygen-rich gas nozzle 12 can through regulating a plurality of adjusting bolts 21 on the nozzle micromatic setting 11, be regulated the relative position of oxygen-rich gas nozzle pipe 22 in becket 19 and center support ring 20 under the help of infrared radiation thermometer 17; Thereby regulate the relative position and the angle Φ 15 of oxygen-rich gas nozzle 12 and fuel nozzle 13, it is combustion-supporting to make oxygen rich gas be cut into combustion flame 16 (being that fuel nozzle ports arrives the flame top zone) high-efficiency jet in the set of regions of fuel nozzle 13 spouts 1/4th to 2/4ths with the linear velocity set and angle.
Measure temperature by infrared radiation thermometer 17; When each regional temperature sum of heated medium pipe 18 outer walls surpassed the temperature sum of measuring before adding oxygen enrichment, regulate fuel flow control valve 23 reduced the fuel supply flow; The temperature that guarantees heated medium pipe 18 each section of the outside with add oxygen enrichment before under the consistent condition; Make combustion flame 16 central temperatures bring up to maximum, thereby when guaranteeing former heats, reduce the consumption of fuel, thereby realize energy-conservation.
As shown in Figure 3; Nozzle micromatic setting 11 comprises becket 19, is installed in a plurality of adjusting bolts 21 and a center support ring 20 on the becket 19 perpendicular to becket 19 axis screw threads; Wherein oxygen-rich gas nozzle pipe 22 passes becket 19 and center support ring 20 in the gap successively; Connect oxygen-rich gas nozzle 12, a plurality of adjusting bolts 21 are distributed on the becket 19, regulate the end of bolt (21) and conflict on oxygen-rich gas nozzle pipeline 22.
Claims (6)
1. combustion furnace by oxygen-rich partial oxygen-enriched jet flow combustion supporting improves the method for the thermal efficiency; Comprising that fuel and oxygen rich gas get into to flock together in the combustion furnace separately mixes and burns; It is characterized in that: described oxygen rich gas is after supercharging; Mix and burn to become 10 °～45 ° angle with injected fuel and to get into fuel stream zone with the linear velocity jet of 1.2～4.0 times of fuel flow rates, the position that oxygen rich gas gets into is apart near the position between the fuel nozzle spout 1/4th to 2/4ths between the spout of combustion flame top and fuel nozzle (13).
2. combustion furnace by oxygen-rich partial oxygen-enriched jet flow combustion supporting as claimed in claim 1 improves the method for the thermal efficiency, it is characterized in that: also regulate the fuel flow rate that gets into the combustion zone through the temperature of test combustion zone and radiation areas.
3. combustion furnace by oxygen-rich partial oxygen-enriched jet flow combustion supporting improves the device of the thermal efficiency; Comprise oxygen concentration device and fuel injection device; It is characterized in that: also comprise gas pressurized device (7); Gas pressurized device (7) connects oxygen-rich gas nozzle (12); Fuel nozzle (13) the angle angle of oxygen-rich gas nozzle (12) and fuel injection device is 10 °～45 ° a angle (15), and gets into fuel stream zone with the linear velocity jet of 1.2～4.0 times of fuel flow rates and mix and burn, and the position that oxygen rich gas gets into is apart near the position between the fuel nozzle spout 1/4th to 2/4ths between the spout of combustion flame top and fuel nozzle (13).
4. combustion furnace by oxygen-rich partial oxygen-enriched jet flow combustion supporting as claimed in claim 3 improves the device of the thermal efficiency, and it is characterized in that: oxygen-rich gas nozzle (12) is provided with nozzle micromatic setting (11), with the angle between adjustment oxygen-rich gas nozzle (12) and fuel nozzle (13).
5. combustion furnace by oxygen-rich partial oxygen-enriched jet flow combustion supporting as claimed in claim 4 improves the device of the thermal efficiency; It is characterized in that: described nozzle micromatic setting (11) comprises becket (19), is installed in a plurality of adjusting bolts (21) and a center support ring (20) on the becket (19) perpendicular to becket (19) axis screw thread; Wherein oxygen-rich gas nozzle pipe (22) passes becket (19) and center support ring (20) in the gap successively; Connect oxygen-rich gas nozzle (12); A plurality of adjusting bolts (21) are distributed on the becket (19), regulate the end of bolt (21) and conflict on oxygen-rich gas nozzle pipeline (22).
6. improve the device of the thermal efficiency like claim 3,4 or 5 described combustion furnace by oxygen-rich partial oxygen-enriched jet flow combustion supporting; It is characterized in that: infrared radiation thermometer (17) is set; Measure heated medium pipe (18) each section of outer wall and each regional point for measuring temperature temperature of combustion flame (16); Fuel flow control valve is set in the fuel injection device, adjusts the fuel-feed amount according to the temperature that infrared radiation thermometer records.
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| CN2010101154507A CN101776277B (en) | 2010-02-27 | 2010-02-27 | Method and device for improving heat efficiency of combustion furnace by oxygen-rich partial oxygen-enriched jet flow combustion supporting |
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| CN101776277B true CN101776277B (en) | 2012-07-04 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101893254A (en) * | 2010-09-03 | 2010-11-24 | 魏伯卿 | Method and device for improving production load of combustion furnace by oxygen enrichment and local oxygenation jet combustion supporting |
| CN101893253A (en) * | 2010-09-03 | 2010-11-24 | 魏伯卿 | Method for improving combustion temperature of combustion furnace by local oxygen-enriched oxygenation jet combustion-supporting technology and device thereof |
| CN102425803A (en) * | 2011-09-14 | 2012-04-25 | 魏伯卿 | Method of supporting layering combustion in multistage paramagnetic enriched oxygen local oxygen increasing and jetting flow manner |
| CN102607029A (en) * | 2012-03-15 | 2012-07-25 | 南京钢铁股份有限公司 | Regenerative heating furnace |
| 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 |
| CN103423761B (en) * | 2013-08-31 | 2016-05-11 | 魏伯卿 | The local oxygen-enriched oxygenation jet combustion supporting of oil plant heating furnace energy-saving and emission-reduction system |
| 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 |
| CN105953409A (en) * | 2016-06-27 | 2016-09-21 | 河南中托力合化学有限公司 | Vertical energy saving device for fuel gas heating medium furnace |
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2010
- 2010-02-27 CN CN2010101154507A patent/CN101776277B/en not_active Expired - Fee Related
Patent Citations (6)
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|---|---|---|---|---|
| WO1994024489A1 (en) * | 1993-04-13 | 1994-10-27 | Gas Research Institute | Reduction of nitrogen oxides in oxygen-enriched combustion |
| US5688115A (en) * | 1995-06-19 | 1997-11-18 | Shell Oil Company | System and method for reduced NOx combustion |
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