CN205191551U - Hierarchical low -nitrogen combustion equipment of wind coal charge - Google Patents
Hierarchical low -nitrogen combustion equipment of wind coal charge Download PDFInfo
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- CN205191551U CN205191551U CN201520983195.6U CN201520983195U CN205191551U CN 205191551 U CN205191551 U CN 205191551U CN 201520983195 U CN201520983195 U CN 201520983195U CN 205191551 U CN205191551 U CN 205191551U
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- tertiary air
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- dore furnace
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Abstract
The utility model relates to a hierarchical low -nitrogen combustion equipment of wind coal charge, including dore furnace, cubic blast gate, a whirlwind section of thick bamboo, rotary kiln and flap valve, this equipment of its characterized in that still includes high temperature resistant lock wind screw conveyer, roots's fan, newly -increased cubic blast gate and depiler valve, the tertiary air that is equipped with tertiary air import on the dore furnace and is divided is away newly imported, and the tertiary air house steward says the tertiary air access connection on tertiary air valve and dore furnace, establish tertiary air branch road pipeline on the total pipeline of the tertiary air through after the cubic blast gate, set up newly -increased cubic blast gate on tertiary air branch road pipeline, tertiary air branch road pipeline is through the new access connection of tertiary air that increases the cubic blast gate newly with divided away, regional for returning to the original condition or shape the resolver between the lower terminal surface of dore furnace cone and the lower limb of tertiary air import, the region suppresses the district for the reduction between the lower limb of the lower limb of tertiary air import and the new import of tertiary air that is divided away.
Description
Technical field
The utility model belongs to technical field of cement production in building materials industry, is specifically related to wind coal charge classification low nitrogen burning equipment and technology and cement clinker burning system.
Background technology
For reply Against Global Climate Changes, China has issued GB4915-2013 " cement industry atmosphere pollutants emission standards ", requires cement production enterprise nitrogen oxide (NO
x) discharge standard is lower than 400mg/Nm
3, key area NO
xemission control is at 320mg/Nm
3within.After new standard is formulated, due to NO in the waste gas of novel dry-method cement clinker sintering process discharge
xcontent is at 800-1600mg/Nm
3, the result of its low-NO_x combustion technology does not also reach new standard, therefore, has to adopt the method for subsequent processing of a large amount of consumption ammoniacal liquor to reduce NO
xdischarge capacity, namely ammoniacal liquor denitration technology (i.e. now widely used SNCR method).SNCR method weak point is the operating cost (about 5 yuan/ton of grogs) significantly increasing enterprise, and, also inevitably there is escape and the ammoniacal liquor volatilization problems of ammonia, ammoniacal liquor volatilization can produce inflammable, explosive and poisonous gas, corresponding safety management expense also can increase, in addition, the energy consumption in the manufacture process of ammoniacal liquor and disposal of pollutants problem have also been transferred in cement production process.
Present stage, be applied to the NO in novel dry-method cement clinker firing system dore furnace
xemission control technique has air staged combustion technology, fuel-staged combustion technology and SNCR (SNCR) technology etc.Observe in actual production, although SNCR technology NO
xreduction efficiency is higher, is 60-80%, but there is serious deficiency in the escape and ammoniacal liquor volatilization, energy consumption, safety etc. of operating cost, ammonia.Air staged combustion technology NO
xreduction efficiency only has 15-25%, large by operation control effect.Fuel-staged combustion technology NO
xreduction efficiency only has 15-30%, but also the problem of sizing on the limit wall that there is dore furnace cone and smoke-box, cause normally producing continuously.The NO of air staged combustion technology and fuel-staged combustion technology
xreduction efficiency is low, also needs associating SNCR technology to improve NO
xreduction efficiency, therefore, all can not reduce the use amount of ammoniacal liquor in SNCR technology significantly.
Utility model content
For the deficiencies in the prior art, the technical problem that the utility model quasi-solution is determined is: provide a kind of wind coal charge classification low nitrogen burning equipment and technology and cement clinker burning system.High temperature resistant lock wind conveying worm and roots blower is introduced to reduction decomposition district conveying raw material in this equipment, improve the dispersion effect of raw material, make doses more stable, and tertiary air bypass line is established on the tertiary air total pipeline after tertiary air valve, can not change the control method of rotary kiln Sum decomposition stove air balance, do not increase the difficulty that operation controls, energy consumption is low, operation controls simple, can significantly improve NO
xreduction efficiency, is more suitable for applying in cement clinker burning system;
Played coal combustion process reductive NO this process efficient
xmechanism, air staged combustion technology, fuel-staged combustion technology are combined with stock grading combustion technology, and by its integrated use in the dore furnace of novel dry-method cement clinker firing system, by tertiary air, coal dust with enter the low nitrogen burning technique that dore furnace raw material carry out classification simultaneously; The advantage of this technique to make in process of coal combustion to be formed in dore furnace one to be used for reductive NO
xregion, NO
xreduction efficiency reaches 60-80%, significantly improves NO
xreduction efficiency, can stop using SNCR technology reduce NO
xthe method of concentration of emission;
Connect wind coal charge classification low nitrogen burning equipment in this cement clinker burning system, and apply wind coal charge classification low nitrogen burning technique, significantly can reduce NO
xdischarge capacity, realize low nitrogen burning, cost is low, and environmental protection more, is conducive to the further genralrlization application of cement production enterprise, significantly increases economic benefit.
The technical scheme that the utility model solves the employing of described equipment and technology problem is: provide a kind of wind coal charge classification low nitrogen burning equipment, comprise dore furnace, tertiary air valve, cyclone cylinder, rotary kiln and flap valve; It is characterized in that this equipment also comprises high temperature resistant lock wind conveying worm, roots blower, newly-increased tertiary air valve and material distributing valve, described dore furnace is provided with tertiary air import and newly imported by the tertiary air divided away, and tertiary air total pipeline is connected with the tertiary air import on dore furnace through tertiary air valve; Tertiary air total pipeline after tertiary air valve establishes tertiary air bypass line, tertiary air bypass line arranges newly-increased tertiary air valve, tertiary air bypass line is connected with by the tertiary air that divides away is newly imported through newly-increased tertiary air valve; Between the lower surface of dore furnace cone and the lower limb of tertiary air import, region is reduction decomposition district, the lower limb of tertiary air import and by region between the newly imported lower limb of the tertiary air that divides away for reducing inhibition zone, by the newly imported lower limb of the tertiary air divided away to the cyclone cylinder is connected with dore furnace top exit import between region be complete combustion zone, reduction decomposition district and the total height of inhibition zone of reducing are not less than 6m;
The tremie pipe of the cyclone cylinder be not connected with dore furnace is connected with material distributing valve after flap valve, described material distributing valve by tremie pipe for reduction inhibition zone and complete combustion zone raw material are provided; Branch road is had at the tremie pipe entering reduction inhibition zone from material distributing valve, the lower end of this branch road is connected with the import of high temperature resistant lock wind conveying worm, the high temperature resistant outlet of lock wind conveying worm is connected with the tremie pipe import in reduction decomposition district, and the tremie pipe outlet in reduction decomposition district is connected with stuff-spraying pipe; Described roots blower is connected with the outlet of high temperature resistant lock wind conveying worm; Former power transportation pipe is provided with distributing valve, and the output through the power transportation pipe of distributing valve is all connected with coal injection pipe, and reduction decomposition district is connected corresponding coal injection pipe respectively with reduction inhibition zone.
The technical scheme that the utility model solves the employing of described technology problem is: provide a kind of wind coal charge classification low nitrogen burning technique, this technique uses above-mentioned wind coal charge classification low nitrogen burning equipment, and concrete technology step is:
(1) tertiary air is by being graded after tertiary air valve, controlled by newly-increased tertiary air valve, a part enters reduction inhibition zone, a part enters complete combustion zone, regulate newly-increased tertiary air valve, the tertiary air quantity controlling to enter complete combustion zone accounts for the 20-40% of total tertiary air quantity, realizes the classification of tertiary air;
(2) coal dust is by the distributing valve on former power transportation pipe, be assigned to reduction decomposition district and reduction inhibition zone respectively, the coal dust amount controlling to be assigned to reduction decomposition district by distributing valve is not less than 50%, is sprayed into coal dust in Liang Ge district respectively, realize the classification of coal dust by coal injection pipe;
(3) raw material collected by the cyclone cylinder be not connected with dore furnace are divided into three parts and enter reduction decomposition district respectively on the tremie pipe of this cyclone cylinder, reduction inhibition zone and complete combustion zone, material distributing valve distributes the raw material entering reduction inhibition zone and complete combustion zone, branched portion on the tremie pipe entering reduction inhibition zone from material distributing valve, by high temperature resistant lock wind conveying worm, by the tremie pipe import department of raw material conveyor to reduction decomposition district, and deliver to stuff-spraying pipe by roots blower, raw material employing sprays into mode and enters in reduction decomposition district, realize the classification of material,
(4) flue gas that the coal dust firing in rotary kiln produces enters reduction decomposition district through smoke-box from the lower surface of dore furnace cone, the NO in flue gas
xafter the product reduction decomposition of pulverized coal pyrolysis, flue gas and coal dust and raw material upwards enter and reduce inhibition zone; In reduction inhibition zone, coal dust burns under excess air coefficient is the hypoxia condition of 0.7-0.9, containing a small amount of NO
xgas continue upwards to enter complete combustion zone with raw material and the unburnt coal dust of part; In complete combustion zone, unburnt coal dust burns and heat release under the condition of oxygen abundance, the raw material entering this district are made to continue to decompose, raw material after being decomposed discharge dore furnace with gas from dore furnace top exit, enter in the cyclone cylinder that is connected with dore furnace top exit, realize wind coal charge classification low nitrogen burning.
The utility model also protects a kind of cement clinker burning system, especially novel dry-method cement clinker firing system, applies above-mentioned wind coal charge classification low nitrogen burning technique in this system.
Compared with prior art, the utility model apoplexy coal charge classification low nitrogen burning technique, refer to wind coal charge fractional combustion technique, this technique can be applicable to novel dry-method cement clinker firing system, can significantly improve NO in novel dry-method cement clinker sintering process
xreduction efficiency, save the expense that SNCR technology consumes, optimize air staged combustion technology and fuel-staged combustion technology further, the application of this technique can not affect the existing technique of novel dry-method cement clinker firing system, is more conducive to novel dry-method cement clinker firing system and reduces NO
xdischarge.Specifically:
1) NO
xreduction efficiency improves.The amount that in the utility model wind coal charge classification low nitrogen burning technique, coal dust is assigned to reduction decomposition district is increased to more than 50%, and the concentration of the product hydrocarbon group CH after this part pulverized coal pyrolysis increases, more effective reduction decomposition NO
x, improve NO
xreduction efficiency.Prior art Zhong Ci district coal dust accounts for the amount of coal dust between 10-20%, NO
xreduction efficiency 15-30%, by oxygen O in rotary kiln flue gas
2content impact is large, as oxygen O in flue gas
2when content is more than 3.5%, NO in flue gas
xreduction efficiency is very low.In contrast to this, the utility model adds the amount of reduction decomposition district coal dust, by oxygen O in rotary kiln flue gas
2changes of contents impact is little, can ensure NO in flue gas
xreduction efficiency reaches 70-90%.
2) raw material dispersion effect is good, and doses is stablized.The utility model technique by high temperature resistant lock wind conveying worm by the tremie pipe import department of raw material conveyor to reduction decomposition district, and deliver to stuff-spraying pipe by roots blower, raw material are sprayed in reduction decomposition district, effectively reduce the temperature in reduction decomposition district, solve limit wall sizing and the normal problem of producing of impact of dore furnace cone; Wherein high temperature resistant lock wind conveying worm is frequency control, adjustment feeding capacity that can be in good time according to the temperature in reduction decomposition district, the coal dust firing temperature in stability contorting reduction decomposition district.And prior art mostly adopts material distributing valve to carry out sub-material, add the way that flap valve carries out locking wind, the gravity by raw material makes raw material flow in dore furnace, and the stable and dispersion of its doses does not all reach requirement.In addition, add Liang Gen reduction decomposition district thermocouple in this district as reference, be more conducive to operation and control.
3) accurately tertiary air quantity is distributed.The utility model technique keeps the tertiary air quantity entering complete combustion zone between 20-40% by the newly-increased tertiary air valve of adjustment, and the best excess air coefficient of reduction inhibition zone can be made to be stabilized between 0.7-0.9, thus contributes to improving NO
xreduction efficiency, make course of reaction more stable.
4) coal dust fully mixes with air, NO
xreduction reaction is more abundant.In the utility model wind coal charge classification low nitrogen burning equipment, the total height of reduction decomposition district and reduction inhibition zone is not less than 6m, can be NO
xreduction provides time enough, and the air-flow average speed of general reduction decomposition district and reduction inhibition zone is 8-10m/s, like this, and NO
xrecovery time altogether about more than 0.5s.The height being not less than 6m is conducive to fully mixing and NO of coal dust and air
xfully react with reducing substances, for improving NO
xreduction efficiency provide guarantee.
5) be easy to control.In prior art, the tertiary air bypass line of complete combustion zone is arranged on before tertiary air valve, namely tertiary air is first assigned to a complete combustion zone part, dore furnace is entered again after tertiary air valve, like this, tertiary air turn increases one and clicks and enters dore furnace on tertiary air pipeline, the problem of the coal dust firing air balance used of the coal dust Sum decomposition stove of restive rotary kiln has been there is, the difficulty that the operation adding Cement clinker buring process controls in practical operation.And the tertiary air bypass line to complete combustion zone is arranged between tertiary air valve and dore furnace by the utility model instrument and supplies, namely tertiary air is by being redistributed to a complete combustion zone part after tertiary air valve, like this, tertiary air valve controls not to be changed into the mode of dore furnace tertiary air total amount, namely the control method of rotary kiln Sum decomposition stove air balance is not changed, therefore, the utility model does not increase the difficulty that operation controls, and is easy to apply.
6) cost is low, does not have secondary pollution.The utility model wind coal charge classification low nitrogen burning instrument and supplies is applied in novel dry-method cement clinker sintering process, the NO of novel dry-method cement clinker sintering process can be made
xreduction efficiency brings up to 60-80%, obviously can reach the NO of SNCR technology
xreduction efficiency, apply operating cost of the present utility model (less than 0.1 yuan/ton of grog) SNCR technology is much lower relatively simultaneously, and can not bring secondary pollution.
In addition, the utility model overcomes present stage requirement cement production enterprise and all installs NO
xexhausting control system, cement production enterprise can for reducing costs and not removing ACTIVE CONTROL NO
xthe drawback of discharge capacity, can be dissolved into completely in novel dry-method cement clinker sintering process, for enterprise brings larger economic benefit.
Accompanying drawing explanation
Fig. 1 is the process chart of a kind of novel dry-method cement clinker firing system in prior art;
Fig. 2 is the regional structure schematic diagram of dore furnace in the utility model wind coal charge classification low nitrogen burning equipment;
Fig. 3 is the process chart of the utility model wind coal charge classification low nitrogen burning technique;
Fig. 4 is the overall structure schematic diagram of the utility model wind coal charge classification low nitrogen burning equipment;
In figure, 1-rotary kiln, 2-preheater, 3-cooler, 4-smoke-box, 5-dore furnace, 6-tertiary air, 7-coal dust, 8-raw material, 9-flap valve, 10-waste gas, 11-coal burner, C1, C2, C3, C4, C5-cyclone cylinder, 5-1-reduction decomposition district, 5-2-reduction inhibition zone, 5-3-combustion zone completely, 12-high temperature resistant lock wind conveying worm, 13-roots blower, 14-tertiary air valve, 15-newly-increased tertiary air valve, 16-material distributing valve.
Detailed description of the invention
The utility model is further illustrated below in conjunction with embodiment and accompanying drawing thereof, but not in this, as the restriction to the application's claims.
The utility model wind coal charge classification low nitrogen burning equipment (is called for short equipment, see Fig. 4) comprise dore furnace 5 (lower surface of dore furnace cone to cyclone cylinder C5 import between be dore furnace, see Fig. 1), tertiary air valve 14, (cyclone cylinder C4 is not connected with dore furnace 5 cyclone cylinder C4-C5, dore furnace 5 top exit is connected with the import of cyclone cylinder C5), rotary kiln 1, flap valve 9, high temperature resistant lock wind conveying worm 12, roots blower 13, newly-increased tertiary air valve 15 and material distributing valve 16, described dore furnace 5 is provided with tertiary air import and newly imported by the tertiary air divided away, tertiary air total pipeline is connected with the tertiary air import on dore furnace 5 through tertiary air valve 14, tertiary air total pipeline after tertiary air valve 14 establishes tertiary air bypass line, tertiary air bypass line arranges newly-increased tertiary air valve 15, tertiary air bypass line is connected with by the tertiary air that divides away is newly imported through newly-increased tertiary air valve 15, reduction decomposition district 5-1, reduction inhibition zone 5-2 and complete combustion zone 5-3 is divided into from bottom to top in dore furnace 5 (see Fig. 2), between the lower surface of dore furnace cone and the lower limb of tertiary air import, region is reduction decomposition district 5-1, the lower limb of tertiary air import and by region between the newly imported lower limb of the tertiary air that divides away for reducing inhibition zone 5-2, between the import of the lower limb newly imported by the tertiary air divided away and cyclone cylinder C5, region is complete combustion zone 5-3, and the total height of reduction decomposition district 5-1 and reduction inhibition zone 5-2 is not less than 6m,
The tremie pipe of the cyclone cylinder C4 be not connected with dore furnace is connected with material distributing valve 16 after flap valve 9, described material distributing valve 16 by tremie pipe for reduction inhibition zone 5-2 and complete combustion zone 5-3 raw material are provided; Branch road is had at the tremie pipe entering reduction inhibition zone 5-2 from material distributing valve 16, the lower end of this branch road is connected with the import of high temperature resistant lock wind conveying worm 12, the outlet of high temperature resistant lock wind conveying worm 12 is connected with the tremie pipe import of reduction decomposition district 5-1, and the tremie pipe outlet of reduction decomposition district 5-1 is connected with stuff-spraying pipe; Described roots blower 13 is connected with the outlet of high temperature resistant lock wind conveying worm 12; Former power transportation pipe is provided with distributing valve, and the output through the power transportation pipe of distributing valve is all connected with coal injection pipe, and reduction decomposition district 5-1 is connected corresponding coal injection pipe respectively with reduction inhibition zone 5-2.
The utility model equipment is further characterized in that the sectional area of described tertiary air bypass line is the 40-50% of the sectional area of tertiary air total pipeline.
The utility model equipment is further characterized in that the lateral attitude of described stuff-spraying pipe is 0.3-1.5m apart from the distance of the lower surface of dore furnace 5 cone, and the spout central line of stuff-spraying pipe and the angle of horizontal direction are 10-45 °; Coal injection pipe in reduction decomposition district 5-1 is 0.5-2m apart from the distance of the lower surface of dore furnace 5 cone.
The utility model equipment is further characterized in that the quantity that reduction decomposition district connects corresponding coal injection pipe and stuff-spraying pipe is 2-4.
The utility model equipment is further characterized in that the quantity of described tertiary air bypass line is 1-2.
The utility model equipment is further characterized in that and is provided with reduction decomposition district thermocouple T1 in the downward 1-2m region of the lower limb of the import of tertiary air; At the top edge of the import of tertiary air, reduction inhibition zone thermocouple T2 is upwards installed in 1-2m region; The circle at the lower limb place newly imported by the tertiary air that divides away is equipped with Pressure gauge P.
The utility model equipment is further characterized in that the quantity of reduction decomposition district thermocouple T1 is 2, and Liang Gen reduction decomposition district thermocouple T1 is positioned at circumferentially same, and angle is therebetween 90 °.
The utility model wind coal charge classification low nitrogen burning technique (being called for short technique, see Fig. 3), the step of this technique is:
(1) tertiary air is by being graded after tertiary air valve 14, controlled by newly-increased tertiary air valve 15, a part enters reduction inhibition zone 5-2, a part enters complete combustion zone 5-3, regulate newly-increased tertiary air valve 15, the tertiary air quantity controlling to enter complete combustion zone 5-3 accounts for the 20-40% of total tertiary air quantity, realizes the classification of tertiary air;
(2) coal dust is by the distributing valve on former power transportation pipe, be assigned to reduction decomposition district 5-1 and reduction inhibition zone 5-2 respectively, the coal dust amount controlling to be assigned to reduction decomposition district 5-1 by distributing valve is not less than 50%, by coal injection pipe, coal dust is sprayed into respectively in Liang Ge district, realize the classification of coal dust;
(3) raw material collected by cyclone cylinder C4 be not connected with dore furnace are divided into three parts and enter reduction decomposition district 5-1 respectively on the tremie pipe of this cyclone cylinder C4, reduction inhibition zone 5-2 and complete combustion zone 5-3, material distributing valve 16 distributes the raw material entering reduction inhibition zone 5-2 and complete combustion zone 5-3, branched portion on the tremie pipe entering reduction inhibition zone 5-2 from material distributing valve 16, by high temperature resistant lock wind conveying worm 12, by the tremie pipe import department of raw material conveyor to reduction decomposition district 5-1, and deliver to stuff-spraying pipe by roots blower 13, raw material employing sprays into mode and enters in reduction decomposition district 5-1, realize the classification of material,
(4) flue gas that the coal dust firing in rotary kiln 1 produces enters reduction decomposition district 5-1 through smoke-box 4 from the lower surface of dore furnace 5 cone, the NO in flue gas
xafter the product reduction decomposition of coal dust 7 pyrolysis, flue gas and coal dust and raw material upwards enter and reduce inhibition zone 5-2; In reduction inhibition zone 5-2, coal dust 7 burns under excess air coefficient is the hypoxia condition of 0.7-0.9, the NO that its product burnt will generate
xreduction and suppression NO
xregeneration, containing a small amount of NO
xgas continue upwards to enter complete combustion zone 5-3 with raw material and the unburnt coal dust of part; At complete combustion zone 5-3, unburnt coal dust burns and heat release under the condition of oxygen abundance, and make the raw material entering this district continue to decompose, the raw material after being decomposed discharge dore furnace 5 with gas, enter in the cyclone cylinder C5 that is connected with dore furnace top exit, realize wind coal charge classification low nitrogen burning.
The utility model also protects a kind of cement clinker burning system, especially novel dry-method cement clinker firing system, it is characterized in that applying above-mentioned wind coal charge classification low nitrogen burning instrument and supplies in this system.
The coal charge of wind described in the utility model fractional combustion refer to by Researched of Air Staging Combustion Burning Pulverized Coal in prior art, fuel-staged combustion, stock grading burning comprehensive, StagedAirandCoalandMealCombustion, english abbreviation is SACMC; The described tertiary air referred to by the tertiary air divided away in tertiary air bypass line; The quantity of the tertiary air bypass line of complete combustion zone enters the mode of dore furnace 5 according to former tertiary air 6 and determines, and is generally 1-2.
Fig. 1 is the process chart of a kind of novel dry-method cement clinker firing system in prior art, and the one that the application chooses in the technological process of all types of novel dry-method cement clinker firing system exemplarily illustrates.Each equipment effect in figure is: rotary kiln 1 is the capital equipment of calcination of cement clinker, rotary kiln 1 comprises smoke-box 4 and coal burner 11, coal burner 11 can make coal dust firing form flame, distribute heat calcination of cement clinker, flue gas after burning discharges the lower inlet entering dore furnace 5 from smoke-box 4, rotary kiln 1 is NO
xone of generation source, the NO that in rotary kiln 1, coal dust firing produces
xall enter in dore furnace 5 with flue gas; Preheater 2 has been the equipment of the preheating Sum decomposition of raw material 8, preheater 2 comprise five-stage whirlwind cylinder C1 ~ C5, flap valve 9 Sum decomposition stove 5 (lower surface of dore furnace cone to cyclone cylinder C5 import between be dore furnace), cyclone cylinder C1 ~ C5 plays preheating and collects raw material, flap valve 9 plays lock wind action to the tremie pipe of cyclone cylinder C1 ~ C5, and dore furnace 5 is for decomposing the CaCO in raw material 8
3, burnt for dore furnace 5 provides CaCO by coal dust 7
3heat needed for decomposition, dore furnace 5 is NO
xone of generation source is also reductive NO simultaneously
xnO is generated with suppression
xequipment; Cooler 3 is for cooling from rotary kiln 1 grog out; An air part for cooling grog enters rotary kiln 1, and be called Secondary Air, a part enters dore furnace 5, is called tertiary air 6.In figure, dotted arrow represents that tertiary air 6 is in intrasystem trend, and the waste gas 10 that system is discharged also represents with dotted arrow, and solid arrow represents that raw material 8 are in intrasystem trend, and dotted line arrow represents that coal dust 7 is in intrasystem trend.
The concrete technology flow process of novel dry-method cement clinker firing system is: raw material 8 are from the increase in pipeline of preheater 2 top feeding cyclone cylinder C2 outlet, being carried by air-flow from bottom to top after raw material 8 feed enters in cyclone cylinder C1, raw material 8 are collected in cyclone cylinder C1, gravity is relied on to enter in the increase in pipeline of cyclone cylinder C3 outlet by flap valve 9, being carried by air-flow from bottom to top enters in cyclone cylinder C2, raw material 8 are collected in cyclone cylinder C2, gravity is relied on to enter in the increase in pipeline of cyclone cylinder C4 outlet by flap valve 9, being carried by air-flow from bottom to top enters in cyclone cylinder C3, raw material are collected in cyclone cylinder C3, gravity is relied on to enter in the increase in pipeline of cyclone cylinder C5 outlet by flap valve 9, being carried by air-flow from bottom to top enters in cyclone cylinder C4, raw material 8 are collected in cyclone cylinder C4, gravity is relied on to enter in dore furnace 5 by flap valve 9, (CaCO after being decomposed in dore furnace 5
3be broken down into CaO and CO
2), being carried by air-flow from bottom to top enters in cyclone cylinder C5, raw material 8 after being decomposed are collected in cyclone cylinder C5, then feed in rotary kiln 1 from smoke-box 4, raw material after being decomposed are burnt till grog in rotary kiln 1, grog enters cooler 3 after being discharged in rotary kiln 1, enters storage facilities through the cooled grog of cooler 3.Now, for cooling the temperature of the air that grog uses, reach 850-1100 DEG C, this part high-temperature gas part enters in rotary kiln 1 (Secondary Air), a part enters in dore furnace 5 (tertiary air 6), and the coal dust 7 be respectively in coal dust (coal dust sprayed into by coal burner 11) the Sum decomposition stove 5 in rotary kiln 1 provides the air of burning; The flue gas that coal dust firing in rotary kiln 1 produces enters in dore furnace 5 through smoke-box 4, and decompose the gas that produces and raw material 8 together enter in cyclone cylinder C5 with the burn flue gas, the raw material 8 that produce of the coal dust 7 in dore furnace 5, after in cyclone cylinder C5, gas is separated with raw material 8, gas upwards enters cyclone cylinder C4, cyclone cylinder C3, cyclone cylinder C2 and cyclone cylinder C1 step by step, complete after raw material transferring heat, finally discharged by the outlet of cyclone cylinder C1, the gas that cyclone cylinder C1 discharges is waste gas 10.Discharge again after lower temperature (250-300 DEG C) gas that cooler produces is discharged into other dust collection device.
Fig. 2 is the regional structure schematic diagram of dore furnace in the utility model wind coal charge classification low nitrogen burning equipment, tertiary air 6 shown in figure, three districts being formed in dore furnace 5 after being graded of coal dust 7 and raw material 8, i.e. reduction decomposition district 5-1, reduction inhibition zone 5-2 and completely combustion zone 5-3, lower area is reduction decomposition district 5-1, in reduction decomposition district 5-1, coal dust 7 pyrolysis under the condition of anoxic, the product hydrocarbon group CH after pyrolysis is by the NO in flue gas
xbe reduced to nitrogen N
2sum decomposition is NH
3, HCN etc.; Central region is reduction inhibition zone 5-2, and in reduction inhibition zone 5-2, coal dust 7 burns reductive NO under the condition of hypoxemia
x, and suppress NO
xregeneration; Upper area is complete combustion zone 5-3, in complete combustion zone 5-3, has sufficient oxygen O
2, make to burn completely at the unburnt coal of reduction inhibition zone 5-2.
The idiographic flow of this schematic diagram is: the flue gas that the coal dust firing in rotary kiln 1 produces is (containing NO
xabout 1000ppm) enter reduction decomposition district 5-1 through smoke-box 4 from the lower surface of dore furnace 5, the NO in flue gas
xafter the product reduction decomposition of coal dust 7 pyrolysis, flue gas and coal dust and raw material upwards enter and reduce inhibition zone 5-2.In reduction inhibition zone 5-2, the NO that the various products that coal dust 7 burns under low oxygen conditions will generate
xreduce and inhibit NO
xregeneration, containing NO
xmeasure low gas to continue upwards to enter complete combustion zone 5-3 with raw material and the unburnt coal dust of part.At complete combustion zone 5-3, unburnt coal dust burns and heat release under the condition of oxygen abundance, make the raw material entering this district continue to decompose, the raw material after being decomposed discharge dore furnace 5 with gas from dore furnace top exit, enter the cyclone cylinder C5 be connected with dore furnace top exit.
Fig. 3 is the process chart of the utility model wind coal charge classification low nitrogen burning technique, and in figure, high temperature resistant lock wind conveying worm 12 is for the raw material of delivery temperature at about 760 DEG C; Roots blower 13 sprays in dore furnace 5 for the raw material sent by high temperature resistant lock wind conveying worm 12; Tertiary air valve 14 is for controlling the balance of rotary kiln 1 Sum decomposition stove 5 air quantity; The effect of newly-increased tertiary air valve 15 controls reduction inhibition zone 5-2 and complete combustion zone 5-3 wind ratio.The effect of material distributing valve 16 is the raw material ratios of distributing reduction inhibition zone 5-2 and complete combustion zone 5-3.Reduction decomposition district thermocouple T1 and reduction inhibition zone thermocouple T2 is respectively used to the temperature measuring reduction decomposition district 5-1 and reduction inhibition zone 5-2, and the effect of the Pressure gauge P of complete combustion zone 5-3 is the pressure detecting 5-3 bottom, complete combustion zone.In figure, dotted arrow represents the trend of gas in equipment, and solid arrow represents the trend of raw material 8 in equipment, and dotted line arrow represents the trend of coal dust 7 in equipment.
The idiographic flow of this technique is: tertiary air 6 is by being graded after tertiary air valve 14, controlled by newly-increased tertiary air valve 15, a part enters reduction inhibition zone 5-2, a part enters complete combustion zone 5-3, the quantity of the tertiary air bypass line of complete combustion zone 5-3 is 2, the tertiary air bypass line sectional area of complete combustion zone 5-3 is the 40-50% of tertiary air total pipeline sectional area, and arrange newly-increased tertiary air valve 15 in the above, tertiary air bypass line inside builds refractory heat-insulating wadding by laying bricks or stones, wadding thickness is 100mm, the position of tertiary air bypass line on tertiary air total pipeline be (namely tertiary air 6 is by classification again after tertiary air valve 14) between tertiary air valve 14 and dore furnace 5.
Coal dust 7 is assigned to reduction decomposition district 5-1 and reduction inhibition zone 5-2 by the method for installing distributing valve on former power transportation pipe, spray in Liang Ge district with coal injection pipe, the coal injection pipe quantity in each district is 2-4, coal injection pipe material selection refractory metal or ceramic material, the size of coal injection pipe is determined according to the parameter of former coal powder conveying system.
The raw material collected by cyclone cylinder C4 be not connected with dore furnace are divided into three parts and enter reduction decomposition district 5-1 respectively, reduce inhibition zone 5-2 and complete combustion zone 5-3 on the tremie pipe of this cyclone cylinder C4, the raw material entering reduction inhibition zone 5-2 and complete combustion zone 5-3 are distributed by material distributing valve 16, there is cutting plate material distributing valve 16 inside has YE in external drive, and the inner all sites of material distributing valve 16 all builds the thick castable of 50mm for heat insulation.Be connected to the import of high temperature resistant lock wind conveying worm 12 in the tremie pipe upper shed entering reduction inhibition zone 5-2 from material distributing valve 16, raw material are made to flow to the charging aperture of high temperature resistant lock wind conveying worm 12 by gravity, and be transported to the tremie pipe import to reduction decomposition district 5-1 by high temperature resistant lock wind conveying worm 12, then deliver to stuff-spraying pipe by roots blower 13, and spray in reduction decomposition district 5-1.High temperature resistant lock wind conveying worm 12 adopts refractory metal material to make, and can work under temperature of charge is the condition of 900 DEG C, and structure is lock wind type, is frequency control.The conveying wind pressure of roots blower 13 is 29-39kPa.Effective internal diameter of the tremie pipe of reduction decomposition district 5-1 is 100mm, and the thick castable of 50mm is built for heat insulation in inside, and this tremie pipe is connected to stuff-spraying pipe, and the quantity of stuff-spraying pipe is 2-4, effective internal diameter 100mm.
Control for ease of operation, on reduction decomposition district 5-1, install reduction decomposition district thermocouple T1 respectively, installed reduction inhibition zone thermocouple T2 in reduction inhibition zone, the range of reduction decomposition district thermocouple T1 and reduction inhibition zone thermocouple T2 is 1200 DEG C.
The technological principle of the utility model wind coal charge classification low nitrogen burning technique is: between the lower surface and the lower limb of tertiary air import of dore furnace 5 cone, set up a reduction decomposition district 5-1, dore furnace 5 part for coal dust 7 is sprayed into this bottom, district, and in rotary kiln, the burning of the coal dust of 1 part coal dust is therewith called as fuel-staged combustion.The temperature produced in rotary kiln 1 enters this district at the flue gas of about 1000 DEG C from the lower surface of dore furnace 5 cone, and after the high-temperature flue gas air-flow of this part coal dust and rising meets, rapid pyrolysis, NO is reduced into N by thermal decomposition product hydrocarbon group CH
2sum decomposition is NH
3, HCN etc., key reaction is: CH+NO → xN (NH
3+ NO+HCN); XN+NO → N
2+ xN.The amount of this part coal dust will account for more than 50% of coal dust 7 total amount, to ensure NO in flue gas
x70-90% be reduced.
Due to sprayed at reduction decomposition district 5-1 account for coal dust 7 total amount more than 50% coal dust, the heat produced after its pyrolysis and small part carbon burning easily makes raw material high temperature be clamminess, and be bonded on the limit wall of dore furnace cone, in order to head it off, a part for the raw material got off by the cyclone cylinder C4 be not connected with dore furnace sprays into the edge of rising flue gas stream stream stock, by CaCO in these raw material
3decomposition absorb heat, thus the problem of sizing on the limit wall avoiding dore furnace cone.The amount that these part raw material spray into reduction decomposition district 5-1 regulates in conjunction with the temperature (temperature controls between 950-1050 DEG C) in production reality detected by reduction decomposition district thermocouple T1, namely regulates the rotating speed of high temperature resistant lock wind conveying worm.
The coal dust of reduction decomposition district 5-1 and raw material rise to reduction inhibition zone 5-2 along with air-flow, tertiary air total pipeline after tertiary air valve 14 establishes tertiary air bypass line, tertiary air bypass line arranges newly-increased tertiary air valve 15, tertiary air in tertiary air bypass line is called by the tertiary air divided away, tertiary air import lower limb and by the region between the newly imported lower limb of tertiary air that divides away for reducing inhibition zone 5-2, be complete combustion zone 5-3 by region between the newly imported lower limb of tertiary air that divides away and the import of cyclone cylinder C5; Tertiary air 6 through tertiary air valve 14, and enters reduction inhibition zone 5-2 and complete combustion zone 5-3 respectively under the control of newly-increased tertiary air valve 15.Will be ensured that the total height of reduction decomposition district 5-1 and reduction inhibition zone 5-2 is not less than 6m by the position that the tertiary air divided away is newly imported, can be NO
xreduction provides time enough, and the air-flow average speed of general reduction decomposition district 5-1 and reduction inhibition zone 5-2 is 8-10m/s, like this, and NO
xrecovery time altogether about more than 0.5s.The height being greater than 6m is conducive to fully mixing and NO of coal dust and air
xfully react with reducing substances, for improving NO
xreduction efficiency provide guarantee.The coal dust of reduction inhibition zone 5-1 and complete combustion zone 5-2 burns under the condition of first hypoxemia (excess air coefficient is less than 1) oxygen enrichment (excess air coefficient is greater than 1) afterwards, is called Researched of Air Staging Combustion Burning Pulverized Coal.The coal dust of reduction decomposition district 5-1 burns after mix with the coal dust of reduction inhibition zone 5-2 under excess air coefficient is the hypoxia condition of 0.7-0.9, and burning generates CO, and the nitrogen in coal decomposes generation a large amount of HN, HCN, CN and NH
ideng, their mutual compounds or by existing NO
xreduction decomposition, thus inhibits NO
xgeneration, its NO
xgrowing amount reduce by more than 50%, the finally NO in this twoth district
xreduction efficiency can reach 60-80%, and the key reaction of reduction inhibition zone 5-2 is: CO+NO → CO
2+ 1/2N
2; XN+xN → N
2+ N+N → N
2; XN+NO → N
2+ xN.For reaching the best excess air coefficient of reduction inhibition zone 5-2 between 0.7-0.9, the tertiary air quantity entering complete combustion zone 5-3 will control between 20-40%, and point wind is too much very few all can reduce NO
xreduction efficiency.The method that tertiary air 6 carries out air classification again after tertiary air valve 14 ensure that the constant of tertiary air 6 total amount, avoids the process system affecting novel dry-method cement clinker firing system because of the change of tertiary air 6 total amount.
The coal dust firing speed of reduction inhibition zone 5-2 directly affects resolution ratio and the NO of raw material in dore furnace
xreduction efficiency, therefore, need the raw material that the cyclone cylinder C4 is not connected with dore furnace gets off to be redistributed to a part of temperature controlling to reduce inhibition zone 5-2 of complete combustion zone 5-3, like this, the raw material that the cyclone cylinder C4 be not connected with dore furnace gets off are divided into reduction decomposition district 5-1, reduce inhibition zone 5-2, completely combustion zone 5-3 tri-part to control the burning of these three district's coal dusts in dore furnace, realize stock grading burning.The temperature that the raw material amount being assigned to complete combustion zone 5-3 detects according to reduction inhibition zone thermocouple T2 controls, and temperature controls between 950-1100 DEG C, adjusts a point doses by the material distributing valve 16 be arranged on the cyclone cylinder C4 tremie pipe that is not connected with dore furnace.In the region of the top edge that reduction inhibition zone thermocouple T2 is arranged on distance tertiary air import upwards 1-2m.
In prior art, the NO that air staged combustion technology and fuel-staged combustion technology are formed
xreduced zone have at more than 15m, only about the 3m had, different, NO
xreduction efficiency also difference is very large, the utility model is with regard to the layout NO of different decomposition stove Sizes
xreduced zone, generally large-scale dore furnace is very easy to arrange the position of reduction decomposition district 5-1, reduction inhibition zone 5-2 and complete combustion zone 5-3, and the NO of a more than 6m arranged by small-sized dore furnace
xafter reduced zone, the height of complete combustion zone 5-3 diminishes, the burn-off rate of coal dust in dore furnace is easily caused to reduce, therefore, the small-sized dore furnace do not met the demands needs to undergo technological transformation, general measures lengthens decomposition furnace outlet duct height, thus extend the time of gas by dore furnace, is the condition provided of burning completely of coal dust.
Embodiment 1
The present embodiment wind coal charge classification low nitrogen burning equipment comprises dore furnace 5, tertiary air valve 14, cyclone cylinder C4-C5, rotary kiln 1, flap valve 9, high temperature resistant lock wind conveying worm 12, roots blower 13, newly-increased tertiary air valve 15 and material distributing valve 16, described dore furnace 5 is provided with tertiary air import and newly imported by the tertiary air divided away, and tertiary air total pipeline is connected with the tertiary air import on dore furnace 5 through tertiary air valve 14; Tertiary air total pipeline after tertiary air valve 14 establishes tertiary air bypass line, tertiary air bypass line arranges newly-increased tertiary air valve 15, tertiary air bypass line is connected with by the tertiary air that divides away is newly imported through newly-increased tertiary air valve 15; Dore furnace 5 is divided into reduction decomposition district 5-1, reduction inhibition zone 5-2 and complete combustion zone 5-3 from bottom to top, between the lower surface of dore furnace cone and the lower limb of tertiary air import, region is reduction decomposition district 5-1, the lower limb of tertiary air import and by region between the newly imported lower limb of the tertiary air that divides away for reducing inhibition zone 5-2, by the newly imported lower limb of the tertiary air divided away to and the import of cyclone cylinder C5 between region be complete combustion zone 5-3, the total height of reduction decomposition district 5-1 and reduction inhibition zone 5-2 is 10m;
The tremie pipe of the cyclone cylinder C4 be not connected with dore furnace is connected with material distributing valve 16 after flap valve 9, described material distributing valve 16 by tremie pipe for reduction inhibition zone 5-2 and complete combustion zone 5-3 raw material are provided; Branch road is had at the tremie pipe entering reduction inhibition zone 5-2 from material distributing valve 16, the lower end of this branch road is connected with the import of high temperature resistant lock wind conveying worm 12, the outlet of high temperature resistant lock wind conveying worm 12 is connected with the tremie pipe import of reduction decomposition district 5-1, and the tremie pipe outlet of reduction decomposition district 5-1 is connected with stuff-spraying pipe; Described roots blower 13 is connected with the outlet of high temperature resistant lock wind conveying worm 12; Former power transportation pipe is provided with distributing valve, and the output through the power transportation pipe of distributing valve is all connected with coal injection pipe, and reduction decomposition district 5-1 is connected corresponding coal injection pipe respectively with reduction inhibition zone 5-2.
The step of the present embodiment wind coal charge classification low nitrogen burning technique is:
(1) tertiary air is by being graded after tertiary air valve 14, controlled by newly-increased tertiary air valve 15, a part enters reduction inhibition zone 5-2, a part enters complete combustion zone 5-3, regulate newly-increased tertiary air valve 15, the tertiary air quantity controlling to enter complete combustion zone 5-3 accounts for the 20-40% of total tertiary air quantity, realizes the classification of tertiary air;
(2) coal dust is by the distributing valve on former power transportation pipe, be assigned to reduction decomposition district 5-1 and reduction inhibition zone 5-2 respectively, the coal dust amount controlling to be assigned to reduction decomposition district 5-1 by distributing valve is not less than 50%, by coal injection pipe, coal dust is sprayed into respectively in Liang Ge district, realize the classification of coal dust;
(3) raw material collected by cyclone cylinder C4 be not connected with dore furnace are divided into three parts and enter reduction decomposition district 5-1 respectively on the tremie pipe of this cyclone cylinder C4, reduction inhibition zone 5-2 and complete combustion zone 5-3, material distributing valve 16 distributes the raw material entering reduction inhibition zone 5-2 and complete combustion zone 5-3, branched portion on the tremie pipe entering reduction inhibition zone 5-2 from material distributing valve 16, by high temperature resistant lock wind conveying worm 12, by the tremie pipe import department of raw material conveyor to reduction decomposition district 5-1, and deliver to stuff-spraying pipe by roots blower 13, raw material employing sprays into mode and enters in reduction decomposition district 5-1, realize the classification of material,
(4) temperature that the coal dust firing in rotary kiln 1 produces enters reduction decomposition district 5-1 through smoke-box 4 from the lower surface of dore furnace 5 cone, the NO in flue gas at the flue gas of about 1000 DEG C
xafter the product reduction decomposition of coal dust 7 pyrolysis, flue gas and coal dust and raw material upwards enter and reduce inhibition zone 5-2; In reduction inhibition zone 5-2, coal dust 7 burns under excess air coefficient is the hypoxia condition of 0.7-0.9, the NO that its product burnt will generate
xreduction and suppression NO
xregeneration, containing a small amount of NO
xgas continue upwards to enter complete combustion zone 5-3 with raw material and the unburnt coal dust of part; At complete combustion zone 5-3, unburnt coal dust burns and heat release under the condition of oxygen abundance, make the raw material entering this district continue to decompose, the raw material after being decomposed are discharged dore furnace 5 with gas and are entered the cyclone cylinder C5 be connected with dore furnace top exit, realize wind coal charge classification low nitrogen burning.
In the present embodiment, the quantity of the tertiary air bypass line of complete combustion zone 5-3 is 2, the sectional area of the tertiary air bypass line of complete combustion zone 5-3 is 50% of the sectional area of tertiary air total pipeline, tertiary air bypass line inside builds refractory heat-insulating wadding by laying bricks or stones, wadding thickness is 100mm, and in reduction decomposition district 5-1 and reduction inhibition zone 5-2, the quantity of coal injection pipe is 2.The distance of the lower surface of the lateral attitude distance dore furnace cone of described stuff-spraying pipe is 0.3m, and the spout central line of stuff-spraying pipe and the angle of horizontal direction are 45 °; Coal injection pipe in reduction decomposition district is 0.5m apart from the distance of the lower surface of dore furnace cone.The ratio that coal dust 7 is assigned to reduction decomposition district 5-1 and reduction inhibition zone 5-2 is 50:50, and there is cutting plate material distributing valve 16 inside has YE in external drive, and the inner all sites of material distributing valve 16 all builds the thick castable of 50mm for heat insulation.
The circle of the downward distance 2m of the lower limb of the import of tertiary air is provided with reduction decomposition district thermocouple T1; The circle of the top edge upwards distance 2m of the import of tertiary air is provided with reduction inhibition zone thermocouple T2; The circle at the lower limb place newly imported by the tertiary air that divides away is equipped with Pressure gauge P, and the range of Pressure gauge P is-1500-0Pa, and the range of reduction decomposition district thermocouple T1 and reduction inhibition zone thermocouple T2 is 1200 DEG C.
High temperature resistant lock wind conveying worm 12 adopts refractory metal material to make, and can work under temperature of charge is the condition of 900 DEG C, and structure is lock wind type, is frequency control.Roots blower 13 carries wind pressure to be 29-39kPa.Effective internal diameter of the tremie pipe of reduction decomposition district 5-1 is 100mm, and the thick castable of 50mm is built for heat insulation in inside, and this tremie pipe is connected to stuff-spraying pipe, and stuff-spraying pipe quantity is 2, and the effective internal diameter of stuff-spraying pipe is 100mm.
The equipment of the wind coal charge classification low nitrogen burning technique in the present embodiment is applied in the novel dry-method cement clinker firing system shown in Fig. 1, significantly improves NO in novel dry-method cement clinker sintering process
xreduction efficiency, has saved the expense that SNCR technology consumes, and is more conducive to the NO realizing novel dry-method cement clinker firing system
xreduce discharging.
Embodiment 2
The annexation of the present embodiment wind coal charge classification low nitrogen burning equipment and the step of technique are with embodiment 1, the lateral attitude of stuff-spraying pipe described in the equipment that difference is the present embodiment apart from the distance of the lower surface of dore furnace cone for being 0.7m, and stuff-spraying pipe is in reduction decomposition district all the time, the spout central line of stuff-spraying pipe and the angle of horizontal direction are 25 °; Coal injection pipe in reduction decomposition district is 1m apart from the distance of the lower surface of dore furnace cone.The sectional area of tertiary air bypass line is 40% of the sectional area of tertiary air total pipeline.The total height of reduction decomposition district and reduction inhibition zone is 12m.
In reduction decomposition district 5-1, the quantity of stuff-spraying pipe is 4, and the quantity of reduction decomposition district 5-1 coal injection pipe is 4, the quantity 2 of coal injection pipe in reduction inhibition zone 5-2.The ratio being assigned to the coal dust of reduction decomposition district 5-1 and reduction inhibition zone 5-2 is 60-100:40-0.Along with the increase of the coal dust ratio of reduction decomposition district 5-1, the NO in flue gas
xthe efficiency be reduced also increases, and is up to more than 90%.
Embodiment 3
The annexation of the present embodiment wind coal charge classification low nitrogen burning equipment and the step of technique are with embodiment 1, difference is that the tertiary air import that tertiary air enters dore furnace only has one, and the tertiary air total pipeline after tertiary air valve 14 establishes tertiary air bypass line also to only have one.The circle of the downward distance 1m of the lower limb of the import of tertiary air is provided with Liang Gen reduction decomposition district thermocouple, and Liang Gen reduction decomposition district thermocouple is positioned at circumferentially same, and angle is therebetween 90 °; The circle of the top edge upwards distance 1m of the import of tertiary air is provided with reduction inhibition zone thermocouple;
Embodiment 4
The annexation of the present embodiment wind coal charge classification low nitrogen burning equipment and the step of technique are with embodiment 1, difference is that in the present embodiment, the size of dore furnace is less, the technological transformation that decomposition furnace outlet pipeline is increased, the specification of described dore furnace is ∮ 5800x27000mm.NO in the waste gas that the undersized or cement clinker burning system of dore furnace discharges
xinitial ejection excessive concentration, when applying of the present utility model, then also needs associating SNCR technology to reduce NO
xconcentration of emission, this technique also can reduce the amount using ammoniacal liquor in SNCR technology significantly, realizes reducing NO
xthe object of discharge.
Embodiment 5
The present embodiment is a kind of novel dry-method cement clinker firing system, and this system applies the wind coal charge classification low nitrogen burning Processes and apparatus of embodiment 2.
The utility model is not addressed part and is applicable to prior art.
Claims (3)
1. a wind coal charge classification low nitrogen burning equipment, comprises dore furnace, tertiary air valve, cyclone cylinder, rotary kiln and flap valve; It is characterized in that this equipment also comprises high temperature resistant lock wind conveying worm, roots blower, newly-increased tertiary air valve and material distributing valve, described dore furnace is provided with tertiary air import and newly imported by the tertiary air divided away, and tertiary air total pipeline is connected with the tertiary air import on dore furnace through tertiary air valve; Tertiary air total pipeline after tertiary air valve establishes tertiary air bypass line, tertiary air bypass line arranges newly-increased tertiary air valve, tertiary air bypass line is connected with by the tertiary air that divides away is newly imported through newly-increased tertiary air valve; Between the lower surface of dore furnace cone and the lower limb of tertiary air import, region is reduction decomposition district, the lower limb of tertiary air import and by region between the newly imported lower limb of the tertiary air that divides away for reducing inhibition zone, by the newly imported lower limb of the tertiary air divided away to the cyclone cylinder is connected with dore furnace top exit import between region be complete combustion zone, reduction decomposition district and the total height of inhibition zone of reducing are not less than 6m;
The tremie pipe of the cyclone cylinder be not connected with dore furnace is connected with material distributing valve after flap valve, described material distributing valve by tremie pipe for reduction inhibition zone and complete combustion zone raw material are provided; Branch road is had at the tremie pipe entering reduction inhibition zone from material distributing valve, the lower end of this branch road is connected with the import of high temperature resistant lock wind conveying worm, the high temperature resistant outlet of lock wind conveying worm is connected with the tremie pipe import in reduction decomposition district, and the tremie pipe outlet in reduction decomposition district is connected with stuff-spraying pipe; Described roots blower is connected with the outlet of high temperature resistant lock wind conveying worm; Former power transportation pipe is provided with distributing valve, and the output through the power transportation pipe of distributing valve is all connected with coal injection pipe, and reduction decomposition district is connected corresponding coal injection pipe respectively with reduction inhibition zone.
2. wind coal charge classification low nitrogen burning equipment according to claim 1, is characterized in that the sectional area of described tertiary air bypass line is the 40-50% of the sectional area of tertiary air total pipeline.
3. wind coal charge classification low nitrogen burning equipment according to claim 1, it is characterized in that the lateral attitude of described stuff-spraying pipe is 0.3-1.5m apart from the distance of the lower surface of dore furnace cone, the spout central line of stuff-spraying pipe and the angle of horizontal direction are 10-45 °; Coal injection pipe in reduction decomposition district is 0.5-2m apart from the distance of the lower surface of dore furnace cone.
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|---|---|---|---|
| CN201520983195.6U CN205191551U (en) | 2015-12-01 | 2015-12-01 | Hierarchical low -nitrogen combustion equipment of wind coal charge |
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|---|---|---|---|
| CN201520983195.6U CN205191551U (en) | 2015-12-01 | 2015-12-01 | Hierarchical low -nitrogen combustion equipment of wind coal charge |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106090982A (en) * | 2016-08-12 | 2016-11-09 | 天伟水泥有限公司 | A kind of Calcium Carbide Ash, gangue second-time burning heat reclaiming system |
| CN110487081A (en) * | 2019-09-29 | 2019-11-22 | 沂水山水水泥有限公司 | A kind of improved method of dore furnace tertiary-air pipe |
| CN111750684A (en) * | 2020-07-07 | 2020-10-09 | 天津水泥工业设计研究院有限公司 | Decomposing furnace dense-dilute oxygen-containing zone partition organization combustion self-denitration system and process |
-
2015
- 2015-12-01 CN CN201520983195.6U patent/CN205191551U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106090982A (en) * | 2016-08-12 | 2016-11-09 | 天伟水泥有限公司 | A kind of Calcium Carbide Ash, gangue second-time burning heat reclaiming system |
| CN110487081A (en) * | 2019-09-29 | 2019-11-22 | 沂水山水水泥有限公司 | A kind of improved method of dore furnace tertiary-air pipe |
| CN111750684A (en) * | 2020-07-07 | 2020-10-09 | 天津水泥工业设计研究院有限公司 | Decomposing furnace dense-dilute oxygen-containing zone partition organization combustion self-denitration system and process |
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