CN102809151B - Oxygen-deficient combustion denitration combustor arranged in cement decomposing furnace - Google Patents
Oxygen-deficient combustion denitration combustor arranged in cement decomposing furnace Download PDFInfo
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- CN102809151B CN102809151B CN201210302623.5A CN201210302623A CN102809151B CN 102809151 B CN102809151 B CN 102809151B CN 201210302623 A CN201210302623 A CN 201210302623A CN 102809151 B CN102809151 B CN 102809151B
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Abstract
The invention discloses an oxygen-deficient combustion denitration combustor arranged in a cement decomposing furnace. The combustor consists of three channels which refer to two internal coal air channels and a vortex air channel on the outmost layer respectively, wherein uniformly-distributed adjustable vortex blades are arranged in the vortex air channel. By adjusting the angles and the vortex air volume of the adjustable vortex blades and changing the proportion of coal air in the two coal air channels, the condition of mixing the coal air entering the cement decomposing furnace can be changed, the mixing force can be enhanced, and fuels can be promoted to be subjected to a combustion reaction in the absence of oxygen. The process of heating and decomposing raw materials cannot be influenced in the absence of the oxygen due to relatively high combustion temperatures in the cement decomposing furnace, so that the generation amount of fuel type nitrogen oxides is reduced, the quality of air around a cement plant is improved, and the pollution discharge cost and the operating cost of the whole cement plant are reduced; and simultaneously, the washing and abrading force of dust to the wall of the decomposing furnace and the combustor is reduced, and the service life of the combustor is prolonged.
Description
Technical field
The present invention relates to field of environmental engineering, be specifically related to the burner removing nitrogen oxide in a kind of coal dust firing, particularly relate to a kind of burner being installed on combustion denitration under oxygen-lean atmosphere in cement decomposing furnace.
Background technology
At present, burner used in the dore furnace of cement plant is all carry out the burning of coal dust and the heating Sum decomposition of raw material when excess air coefficient (i.e. the air capacity of effective supply during fuel combustion and the ratio of theoretical air requirement) is greater than 1, and the combustion reference temperature in dore furnace is generally 900 ~ 980 DEG C, more fuel NO can be produced when excess air coefficient is greater than 1, make the discharged nitrous oxides in cement plant not up to standard, add the charges for disposing pollutants in cement plant, too increase the operating cost in whole cement plant simultaneously.In addition, also can increase dust washing away and wearing and tearing and the wearing and tearing to burner furnace wall in dore furnace when air quantity is large, thus decrease the service life of equipment.
In some cement plant dore furnace domestic, burner used comprises igniter at present, and namely arrange torch oil gun at air channel, the center place (coal wind duct 2 namely in Fig. 1 is inner) of burner, its effect is for the coal dust sprayed in dore furnace provides a combustion-supporting condition.The existence of igniter makes device structure more complicated, and manufacturing cost is also higher.Traditional cement kiln, when starting, is first lighted main oil gun and is heated to burner hearth, drops into coal dust again and continue increasing temperature and pressure when fire box temperature reaches uniform temperature, until just can remove main oil gun when kiln load reaches more than 60%; Also the smooth combustion of main oil gun combustion-supporting guarantee kiln must be dropped into during kiln underrun.Compared with the burner not having igniter, the burner structure with igniter is compact, and center caliber is comparatively large, and will consume igniting oil used; In addition, the series of problems occurred when torch oil gun also can be brought to light a fire, such as light a fire whether surely fire, oil firing not exclusively, the phenomenon such as furnace puff, oil dripping and burner hearth coking.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of burner for coal dust firing denitration under oxygen-lean atmosphere in cement decomposing furnace, the fuel NO that the burner that solution is burnt under using excess air coefficient to be greater than 1 condition produces in cement decomposing furnace is more, make cement plant discharged nitrous oxides not up to standard, higher cement plant charges for disposing pollutants and the operating cost in whole cement plant; Increase dust washing away and wearing and tearing and the wearing and tearing to burner furnace wall in dore furnace, thus decrease the problems such as the service life of equipment.
For solving the problems of the technologies described above, the invention provides a kind of burner being installed on combustion denitration under oxygen-lean atmosphere in cement decomposing furnace, this burner is made up of three passages, two coal wind ducts and a Whirl deposite tank passage respectively, wherein Whirl deposite tank passage is at the outermost layer of burner, in this air channel, adjustable swirl vane is set, and two coal wind ducts are two-layer in the inside of burner respectively.
The medium that described two coal wind ducts spray into is all mixtures of coal dust and air, and what take is direct current spray regime; And the medium that Whirl deposite tank passage passes into is air, what take is swirl injection mode.
Be provided with several adjustable swirl vane in described Whirl deposite tank passage, this several adjustable swirl vane is uniformly distributed in Whirl deposite tank passage, and what its quantity depended on coal dust required in the eddy flow air quantity that Whirl deposite tank passage sprays into and dore furnace thereof and air mixes requirement.Preferably, the quantity of described adjustable swirl vane is 4.
By regulate the angle of adjustable swirl vane and eddy flow air quantity and change coal dust in two coal wind ducts and AIR Proportional change enter coal dust and air in cement decomposing furnace mix situation, strengthen mixing dynamics, impel combustion reaction can occur under oxygen lean conditions.Described eddy flow air quantity is lower than the half of whole burner total blast volume; In described two coal wind ducts, the ratio of coal dust and air is at 1.5kg coal dust/1m
3air ~ 3kg coal dust/1m
3regulate in air range; The angle of described adjustable swirl vane regulates within the scope of 7 ° ~ 100 °.
Compared with prior art, beneficial effect of the present invention is:
1, burner of the present invention, while the normal combustion ensureing coal dust in cement decomposing furnace and raw material decomposable process, combustion reaction occurs under oxygen-lean atmosphere, decreases operating cost;
2, the fuel NO that the coal dust of burner ejection generates after combustion with meagre oxygen has had obvious reduction, thus reduce the discharge capacity of cement plant fuel NO, not only improve the air quality of cement plant periphery, but also decrease the charges for disposing pollutants in cement plant;
3, decrease dust washing away and wearing and tearing dynamics the furnace wall of cement decomposing furnace and burner during combustion with meagre oxygen, improve the service life of equipment.
4, because the temperature in cement decomposing furnace is higher, can get up by automatic combustion when pulverized coal injection is entered, therefore burner of the present invention is without the need to igniter, device structure is simple, reduces manufacturing cost.In addition, the present invention be there is no to the burner of igniter, when coal dust sprays into the cement decomposing furnace of high temperature, coal dust can get up by automatic combustion, not only save the manufacturing cost of burner like this, also greatly save the oil mass that igniter will consume, the series of problems brought when also there will not be torch oil gun to light a fire in addition, such as light a fire whether surely fire, oil firing not exclusively, the phenomenon such as furnace puff, oil dripping and burner hearth coking.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation:
Fig. 1 is the vertical section structural map of burner of the present invention;
Fig. 2 is the left view of Fig. 1.
In figure, description of reference numerals is as follows:
1 is coal wind duct, and 2 is coal wind duct, and 3 is Whirl deposite tank passage, and 4 is adjustable swirl vane.
Detailed description of the invention
As shown in Figure 1, whole burner of the present invention does not have igniter, and equipment is simple, burner of the present invention is made up of three passages, and wherein, the inside that coal wind duct 1 and coal wind duct 2 are positioned at burner is two-layer, and coal wind duct 2 is inner most one decks, Whirl deposite tank passage 3 is positioned at outermost layer.Because the temperature in cement decomposing furnace is higher, can get up by automatic combustion when pulverized coal injection is entered, therefore this burner is without the need to igniter, device structure is simple, reduces manufacturing cost.The medium that coal wind duct 1 and coal wind duct 2 spray into comprises coal dust and air two kinds, all mixtures of coal dust and air, what take is direct current spray regime, and the medium that Whirl deposite tank passage 3 passes into is air, what take is swirl injection mode, is provided with adjustable swirl vane 4 in this passage.Under the prerequisite that the total blast volume passed at three passages is certain, the excursion of the eddy flow air quantity that Whirl deposite tank passage 3 sprays into will lower than the half of whole burner total blast volume, and the coal wind ratio (ratio of coal dust and air) of coal wind duct 1 and coal wind duct 2 all can at 1.5kg coal dust/1m
3air ~ 3kg coal dust/1m
3regulate in air range, the angle of adjustable swirl vane 4 can be selected within the scope of 7 ° ~ 100 °, in general finely tunes the angle of blade.Namely when eddy flow air quantity is large, then coal wind duct 1 and coal wind duct 2 air capacity used also just corresponding minimizing, thus coal wind ratio is increased to some extent; By regulating the angle of adjustable swirl vane 4 can change the swirl strength entering Whirl deposite tank in dore furnace, thus affect coal dust and air mix situation.Therefore change the coal wind entered in cement decomposing furnace mix situation by changing the angle of adjustable swirl vane 4 and eddy flow air quantity and coal wind (coal dust and the air) ratio changed in coal wind duct 1 and coal wind duct 2, strengthen mixing dynamics, guarantee coal dust fully mixes with air, wherein excess air coefficient (i.e. the air capacity of effective supply during fuel combustion and the ratio of theoretical air requirement) is lower than 1, and combustion with meagre oxygen (impelling combustion reaction can occur under oxygen lean conditions) occurs the coal dust that this burner is sprayed in the dore furnace of high temperature.Because the ignition temperature in cement decomposing furnace is higher, 900 ~ 980 DEG C of these scopes can be reached, while combustion reaction is carried out under oxygen-lean atmosphere, the heating Sum decomposition process of raw material is not affected yet, not only reduce the growing amount of the fuel NO that coal dust firing generates, improve the ambient air quality in cement plant, reduce charges for disposing pollutants and the operating cost in whole cement plant; Meanwhile, dust to the furnace wall of dore furnace and burner wash away and wearing and tearing dynamics have also been obtained and effectively reduces, thus improve the service life of equipment.Whole combustion process does not affect heating and the decomposition of raw material in cement decomposing furnace.
In the embodiment depicted in figure 2, adjustable swirl vane 4 in Whirl deposite tank passage 3 is equally distributed (showing 4 adjustable swirl vanes 4 in Fig. 2), and in the eddy flow air quantity that the quantity of adjustable swirl vane 4 can spray into according to Whirl deposite tank passage 3 and dore furnace thereof, required coal dust required to increase and decrease with mixing of air.
Claims (5)
1. one kind is installed on the burner of combustion denitration under oxygen-lean atmosphere in cement decomposing furnace, it is characterized in that: this burner is made up of following three passages from inside to outside: the second coal wind duct (2), the first coal wind duct (1) and Whirl deposite tank passage (3), arrange adjustable swirl vane (4) in Whirl deposite tank passage (3); The medium that described second coal wind duct (2), the first coal wind duct (1) spray into is all mixtures of coal dust and air, and what take is direct current spray regime; And the medium that Whirl deposite tank passage (3) passes into is air, what take is swirl injection mode.
2. burner according to claim 1, it is characterized in that: in described Whirl deposite tank passage (3), be provided with several adjustable swirl vane (4), described several adjustable swirl vane (4) is uniformly distributed in Whirl deposite tank passage (3), and what its quantity depended on coal dust required in the eddy flow air quantity that Whirl deposite tank passage (3) sprays into and dore furnace thereof and air mixes requirement.
3. burner according to claim 2, it is characterized in that: by regulate the angle of adjustable swirl vane (4) and eddy flow air quantity and change coal dust in the second coal wind duct (2), the first coal wind duct (1) and AIR Proportional change enter coal dust and air in cement decomposing furnace mix situation, strengthen mixing dynamics, impel combustion reaction can occur under oxygen lean conditions.
4. burner according to claim 2, is characterized in that: the quantity of described adjustable swirl vane (4) is 4.
5. burner according to claim 3, is characterized in that: described eddy flow air quantity is lower than the half of whole burner total blast volume; The ratio of described first coal wind duct (1) and the middle coal dust of the second coal wind duct (2) and air is at 1.5kg coal dust/1m
3air ~ 3kg coal dust/1m
3regulate in air range; The angle of described adjustable swirl vane (4) regulates within the scope of 7 ° ~ 100 °.
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| CN201210302623.5A CN102809151B (en) | 2012-08-23 | 2012-08-23 | Oxygen-deficient combustion denitration combustor arranged in cement decomposing furnace |
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| CN201210302623.5A CN102809151B (en) | 2012-08-23 | 2012-08-23 | Oxygen-deficient combustion denitration combustor arranged in cement decomposing furnace |
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| CN102809151B true CN102809151B (en) | 2015-06-10 |
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| CN105953224B (en) * | 2016-06-20 | 2019-02-26 | 上海三融环保工程有限公司 | A kind of saturated vapor catalytic burner for cement decomposing furnace |
| CN111578270B (en) * | 2020-05-26 | 2022-08-23 | 中国中材海外科技发展有限公司 | Low-nitrogen combustion device for cement kiln tail |
| CN113277760B (en) * | 2021-06-30 | 2023-08-15 | 崇左南方水泥有限公司 | Method and system for cooperatively disposing electrolytic manganese slag by cement kiln |
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| CN202835346U (en) * | 2012-08-23 | 2013-03-27 | 上海三融环保工程有限公司 | Burning denitration burner installed in cement decomposing furnace under lean oxygen atmosphere |
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| CN201215311Y (en) * | 2008-04-30 | 2009-04-01 | 山东电力研究院 | Adjustable bias jet DC coal burner |
| CN202284791U (en) * | 2011-10-22 | 2012-06-27 | 淄博科邦热工科技有限公司 | Burner of decomposition furnace with variable air flow fields |
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| CN202835346U (en) * | 2012-08-23 | 2013-03-27 | 上海三融环保工程有限公司 | Burning denitration burner installed in cement decomposing furnace under lean oxygen atmosphere |
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