CN204830904U - Big difference in temperature alternately material flows predecomposition system of preheating - Google Patents
Big difference in temperature alternately material flows predecomposition system of preheating Download PDFInfo
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- CN204830904U CN204830904U CN201520601024.2U CN201520601024U CN204830904U CN 204830904 U CN204830904 U CN 204830904U CN 201520601024 U CN201520601024 U CN 201520601024U CN 204830904 U CN204830904 U CN 204830904U
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Abstract
The utility model relates to a big difference in temperature alternately material flows predecomposition system of preheating, this system includes whirlwind pre -heater system, dore furnace system and kiln tail smoke -box, whirlwind pre -heater system includes a N level whirlwind section of thick bamboo, other whirlwind section of thick bamboos except that a N level whirlwind section of thick bamboo are all including dividing the material valve, send into than its offgrade whirlwind section of thick bamboo import tuber pipe through the partial material of minute material valve in with the feed opening separately to a N -2 level whirlwind section of thick bamboo for the 1st grade, send another part material into the whirlwind section of thick bamboo that the flue -gas temperature the is higher import tuber pipe or the dore furnace system of this offgrade whirlwind section of thick bamboo, thereby increase the gas -solid difference in temperature in each whirlwind section of thick bamboo import tuber pipe and the dore furnace system. Through the technical scheme of the utility model, having improved raw material heat exchange efficiency, having reduced system's exhaust gas temperature, improved the raw material rate of decomposition, economic benefits and environmental benefit are showing. Be applicable to and create the transformation of preheating the predecomposition system with current cement, also can be used to the powder heat transfer system in the trades such as metallurgy, chemical industry.
Description
Technical field
The utility model belongs to cement industry Thermal Equipment technical field, is specifically related to a kind of large temperature difference cross material flow precalcining system.
Background technology
The development of current new type nonaqueous cement rapidly, energy shortage, adopt cheap low quality coal or anthracite imperative as burning clinker of cement fuel.In New Type Dry-process Cement Production, the harmful components of crude fuel can cause the harm such as skinning in dore furnace, cause the reduction of grog yield and quality and system running rate.As the dore furnace of nucleus equipment, how wherein rational deployment and coupling wind, coal, material, fuel is made to stablize in the dore furnace that raw material are dense, burn completely, make temperature field in furnace even, do not produce localized hyperthermia, and within very short time, complete raw material Decomposition of Calcium Carbonate, and operating flexibility is large, to the strong adaptability etc. of different ature of coal, remain the problem of puzzlement industry.In addition, in high altitude localities, the low impact on cement production system especially heat power engineering system of atmospheric pressure is larger, such as, fuel combustion characteristics alters a great deal, very large on the impact of material suspension, heat exchange, Geldart-D particle, drying materials etc., the heat-insulation and heat-preservation of pre-heating system and the heat radiation of rotary kiln surface are also had a great impact.
There are some intrinsic problems in the solid air preheat decomposition technique of existing height, such as, adopt bi serie pre-heating system to make complex structure, cyclone cylinder is many, and heat loss is large, and blower fan power consumption is high, is not suitable for using on the cement producing line that scale is less; Ature of coal more responsive causing is adapted to as being difficult to during fuel at use low-grade coal or anthracite; And the natural environment of high altitude localities cannot be adapted to, single series preheater is difficult to realize its corresponding technical indicator.
Therefore, be necessary to develop the new and effective precalcining system adapting to different scales or single bi serie, different High aititude natural environment and crude fuel characteristic.
Utility model content
In order to solve the problems of the technologies described above, the utility model proposes a kind of large temperature difference cross material flow precalcining system, the utility model can use low-grade coal or anthracite as fuel, the burning completely in dore furnace, do not produce localized hyperthermia, ensure dore furnace safe operation; Further, the utility model strengthening raw material, in effective heat exchange of precalcining system, reduce system outlet EGT, improve into kiln meal calcining rate; Further, the utility model eliminates the problem of the system skinning caused because volatility of raw material component is higher; In addition, the utility model solves the adaptability problem of system to natural environment under Different Altitude high condition; In addition, the utility model reduces the initial concentration of the NOx that comes out of the stove.
The one that the utility model proposes large temperature difference cross material flow precalcining system, this precalcining system comprises Analyses on Cyclone Preheater System, decomposition furnace system and kiln tail smoke-box, Analyses on Cyclone Preheater System comprises N level cyclone cylinder, flue gas from rotary kiln is discharged from decomposition furnace system after kiln tail smoke-box, then sequentially flow to the 1st grade of cyclone cylinder by airduct from N level cyclone cylinder, and finally discharged by the air outlet of the 1st grade of cyclone cylinder; Other cyclone cylinders except N level cyclone cylinder include material distributing valve, each via material distributing valve, the partial material in feed opening is sent into the cyclone cylinder import airduct of one-level low than it to N-2 level cyclone cylinder for 1st grade, by cyclone cylinder import airduct higher for the flue-gas temperature of another part material feeding comparatively this rudimentary cyclone cylinder or decomposition furnace system; The charging aperture of the diverse location in decomposition furnace system sent into by material in its feed opening by N-1 level cyclone cylinder by material distributing valve; Thus the gas-solid temperature difference increased in each cyclone cylinder import airduct Sum decomposition furnace system; Wherein, the adjustment proportion of each material distributing valve is 0 ~ 50%;
Here N represents the progression of cyclone cylinder in Analyses on Cyclone Preheater System, and in Analyses on Cyclone Preheater System, each cyclone cylinder arranges from top to bottom, and the 1st grade of cyclone cylinder represents cyclone cylinder at the highest level, is called for short C1 cyclone cylinder; N-2 level cyclone cylinder represents level cyclone cylinder third from the bottom, is called for short C
n-2cyclone cylinder; N-1 level cyclone cylinder represents penultimate stage cyclone cylinder, is called for short C
n-1cyclone cylinder; N level cyclone cylinder represents minimum one cyclonic cylinder, is called for short C
ncyclone cylinder.
Further, this decomposition furnace system is that superposition multiple spot supplied materials recirculation type dore furnace is revolved in spray, and this dore furnace comprises dore furnace main body, gooseneck and feed separation and EGR; Wherein, C
n-2partial material in cyclone cylinder feed opening sends into C
ncyclone cylinder outlet conduit, dore furnace main body sent into by another part material;
C
n-1whole materials in cyclone cylinder feed opening, C
n-2material in this another part material in cyclone cylinder feed opening and feed separation and EGR enters in dore furnace main body as the material source of dore furnace, this dore furnace main body arranges reducing respectively at the upper and lower of the position that these materials enter in stove, and enter into the position in stove at material the tertiary air entrance and the coal powder entrance that to enter dore furnace with tangential direction are set along the front end of flue gas direct of travel, when flue gas enters in dore furnace in the mode of spurting from bottom to top from kiln tail smoke-box, the effect that the effect of spurting of the whirlwind effect and flue gas that can reach tertiary air and coal dust superposes mutually, wherein, the reducing that the below, the material place of entering of feed separation and EGR is arranged is the reducing of kiln tail, and this kiln tail reducing is connected with this kiln tail smoke-box downwards,
Material in dore furnace main body enters gooseneck with flue gas, and the partial material in gooseneck enters feed separation and EGR by the inertia moved in flue gas and centrifugal force, and rest materials enters C with flue gas
ncyclone cylinder, this partial material entering feed separation and EGR is the material in described feed separation and EGR.
Further, this dore furnace main body comprises tertiary air entrance, this kiln tail reducing, coal dust cone entrance, dore furnace lower cone, C
n-1subordinate's reducing in underfeed mouth, coal dust cylinder entrance, stove, C
n-1middle part charging aperture, C
n-2reducing is gone up in the middle part of middle part charging aperture and stove;
In stove, in the middle part of subordinate's reducing and stove, upper reducing is separately positioned on lower end in the middle part of dore furnace main body and upper end;
Dore furnace lower cone is positioned at dore furnace lower body part, and the material in feed separation and EGR enters the top of dore furnace lower cone;
Tertiary air enters dore furnace body interior from the upper end of dore furnace lower cone with tangential way along the tertiary air entrance of downward-sloping setting, and in stove, cycle is advanced, in whirlwind effect;
This kiln tail reducing is positioned at the lower end of dore furnace lower cone;
Coal dust cone entrance is positioned on dore furnace lower cone, on the dore furnace cylinder of coal dust cylinder entrance in dore furnace lower cone and stove between subordinate's reducing; Coal dust sprays into from coal dust cone entrance and coal dust cylinder entrance respectively, and two coal injection pipes of each entrance tangentially spray into the circumferencial direction of asymmetric manner along a certain diameter, forms whirlwind effect;
C
n-1underfeed mouth is positioned at also near dore furnace lower cone above dore furnace lower cone, C
n-1middle part charging aperture is arranged in above stove subordinate reducing also near stove subordinate reducing; C
n-1material in cyclone cylinder feed opening is all from C
n-1underfeed mouth enters above dore furnace lower cone; Or a part is from C
n-1middle part charging aperture enters in dore furnace above subordinate's reducing, and another part is from C
n-1underfeed mouth enters above dore furnace lower cone;
C
n-2middle part charging aperture is arranged in also near stove subordinate reducing above stove subordinate reducing, C
n-2this another part material in cyclone cylinder feed opening is from C
n-2middle part charging aperture to enter in dore furnace above subordinate's reducing.
Further, this gooseneck comprises gooseneck ammoniacal liquor spout, block-proof type 180 ° of elbows, airduct and reducing bends; Wherein,
Gooseneck ammoniacal liquor spout is positioned on gooseneck ascending tube;
This gooseneck is connected with dore furnace body top, by airduct and C by block-proof type 180 ° of elbows
ncyclone cylinder connects;
Reducing bend level and cyclone cylinder C
nconnect.
Further, described block-proof type 180 ° of elbow vortex type pipeline turning devices replace.
Further, feed separation and EGR comprise cone of gathering materials, air valve and pipeline; Wherein,
Material in gooseneck enters C respectively
ncyclone cylinder and cone of gathering materials, the top of dore furnace lower cone sent into by the material entering cone of gathering materials by air valve, pipeline.
Further, in the middle part of dore furnace, the top of reducing arranges furnace main body ammoniacal liquor spout, and/or arranges gooseneck ammoniacal liquor spout at gooseneck ascending tube position, makes ammoniacal liquor and NO
xreaction, thus reduce NO
xconcentration of emission.
Further, when the progression of described N level cyclone cylinder is 5 grades, i.e. C1 cyclone cylinder, C2 cyclone cylinder, C3 cyclone cylinder, C4 cyclone cylinder and C5 cyclone cylinder; Wherein,
Gooseneck is connected with the air inlet of C5 cyclone cylinder, and the reducing bend bottom of gooseneck is connected with the underfeed mouth of dore furnace main body through feed separation and EGR;
The feed opening of C5 cyclone cylinder is connected with the charging aperture of kiln tail smoke-box through C5 air valve and tremie pipe, and the air outlet of C5 cyclone cylinder is connected through the air inlet of C5-C4 airduct with C4 cyclone cylinder;
The feed opening of C4 cyclone cylinder is connected with material distributing valve through tremie pipe, two C4 air valves and the tremie pipe thereof of material distributing valve outlet are connected with the underfeed mouth of dore furnace main body and middle part charging aperture respectively, and the air outlet of C4 cyclone cylinder is connected through the air inlet of C4-C3 airduct with C3 cyclone cylinder;
The feed opening of C3 cyclone cylinder is connected with material distributing valve through tremie pipe, two C3 air valves and the tremie pipe thereof of material distributing valve outlet are connected with the charging aperture in the middle part of C5-C4 airduct Sum decomposition furnace main body respectively, and the air outlet of C3 cyclone cylinder is connected through the air inlet of C3-C2 airduct with C2 cyclone cylinder;
The feed opening of C2 cyclone cylinder is connected with material distributing valve through tremie pipe, and two C2 air valves and the tremie pipe thereof of material distributing valve outlet are connected with C4-C3 airduct and C5-C4 airduct respectively, and the air outlet of C2 cyclone cylinder is connected through the air inlet of C2-C1 airduct with C1 cyclone cylinder;
C1 cyclone cylinder is two, the feed opening of these two C1 cyclone cylinders different tremie pipe of respectively hanging oneself is connected with a material distributing valve respectively, the outlet of each material distributing valve is divided into two-way, the C1 air valve having a way outlet respectively to hang oneself different in each material distributing valve outlet and tremie pipe A are connected with C3-C2 airduct, in two material distributing valve outlets, the tremie pipe of two-way outlet unites two into one in addition, is connected with C4-C3 airduct through C1 air valve and tremie pipe B.
The beneficial effects of the utility model:
1. the raw material of cyclone cylinder feed opening are separated a part (0 ~ 50% is adjustable) by material distributing valve by the utility model, the next stage heat exchange unit that feeding flue-gas temperature is higher, form the gas-solid temperature difference larger than former feeding position, to improve gas-solid heat exchange speed, enhanced heat exchange function.In tradition 5 grades of precalcining systems, raw material with thermal current only through 5 heat exchanges, and the utility model technology is by the sub-material to cyclone cylinder outlet raw material, while part raw material carry out the heat exchange of 5 conventional temperature difference in former heat exchange unit, in the next stage heat exchange unit that another part raw material then cross-entry temperature is higher, achieve 4 large temperature difference heat to exchange, fully absorb the heat content in flue gas, improve the raw material temperature after this part heat exchange, reduce flue-gas temperature, thus, the outlet exhaust temperature of system is considerably reduced.
2. the utility model adopts spray to revolve superposition multiple spot supplied materials recirculation type dore furnace, make dore furnace when volume is identical, improve solid-gas ratio in stove, enhance the heat exchange of material, substantially prolongs material at residing time in furnace, ensure that low quality coal and the anthracite Thorough combustion in stove, the adaptability of High aititude and raw materials and fuel is strengthened, thermal regulation is stablized, and operating flexibility increases.
(1) dore furnace main body of the present utility model has unique advantage from vibrational power flow.Stove mode is entered by kiln exit gas, tertiary air and coal dust, and the reasonable setting of reducing in stove, form spurt for three times effect and three whirlwind effects, and spurt and the synergistic effect of whirlwind, improve solid-gas ratio in stove, substantially prolongs material powder and the time of staying of coal dust in stove, improve the efficiency of combustion of raw material heat exchange efficiency and coal dust.
(2) setting of feed separation and EGR in the utility model, directly enhance the solid-gas ratio in dore furnace, improve the burnout rate of meal calcining rate and coal dust to greatest extent, stabilize the thermal regulation of firing system, reduce the thermic load of rotary kiln, improve grog yield and quality.Meanwhile, the problem such as eliminate the accumulation of high-temperature material bottom reducing bend, the smooth and system of ventilation that blocking, skinning cause is unstable, improves the running rate of system, reduces production cost.Be effectively supplementing dore furnace volume, the function also for effectively playing dore furnace serves the important effect of checking on.
(3) dore furnace of the present utility model adopts supplied materials path different from the past, a part of raw material of level cyclone cylinder outlet third from the bottom and whole raw material of penultimate stage cyclone cylinder outlet are introduced dore furnace middle and lower part, both the large temperature difference had been utilized to add the heat exchange amount of raw material, effectively improve heat exchange efficiency, also prevent the appearance moving the problems such as the dore furnace localized hyperthermia that causes and skinning when using low-grade coal or anthracite behind combustion zone, ensure that the safety of dore furnace, for dore furnace adaptation low quality coal or anthracitic burning provide necessary technical guarantee.In addition, also reduce decomposition furnace outlet temperature, effectively prevent the inversion phenomenon of dore furnace and minimum one cyclonic cylinder outlet temperature, reduce the probability of minimum one cyclonic cylinder high temperature blocking.
(4) the utility model adopts the low-NO_x combustion technology of stage burning and Optimizing Combustion system at dore furnace, reduces the part NOx in kiln discharge flue gas, inhibits the generation of NOx in dore furnace, effectively reduce the concentration of NOx in waste gas.
3. the utility model has given full play to should having superiority of suspension preheating and using predecomposition technology, makes to improve 3 ~ 5 percentage points into kiln meal calcining rate, improves clinker 10% ~ 15%; Reduce grog substep power consumption 3.5 ~ 5.0kW.h/t; Reduce heater outlet temperature 35 DEG C ~ 55 DEG C, reduce sinter leaching coal consumption 2.9 ~ 4.5kgce/t; Reduce NOx content 100 ~ 150ppm in waste gas.
For the 2500t/d clinker production line of 1700m High aititude height, according to running calculating in 310 days year, year volume increase 7.750 ~ 11.625 ten thousand tons, grog, year economize on electricity 267 ~ 3,840,000 kWh, year saves standard coal 2248 ~ 3488 tons, and year reduces CO
2discharge capacity 6698 ~ 10296 tons, year reduces SO
2discharge capacity 62 ~ 95 tons, year reduces NOx discharge 183 ~ 358 tons, and year increases total profit more than 762 ~ 1,139 ten thousand yuan, improves grog yield and quality, reduces energy consumption, achieve environmental emission reduction, economic benefit and obvious environment benefit.
Accompanying drawing explanation
Fig. 1 is the structural representation of precalcining system of the present utility model.
Fig. 2 is the structural representation of dore furnace of the present utility model.
Description of reference numerals: 1-C1 cyclone cylinder; 2-C2-C1 airduct; 3-C2 cyclone cylinder; 4,8,13,18-material distributing valve; 5-C1 air valve and tremie pipe A; 6-C3-C2 airduct; 7-C1 air valve and tremie pipe B; 9-C2 air valve and tremie pipe A; 10-C2 air valve and tremie pipe B; 11-C3 cyclone cylinder; 12-C4-C3 airduct; 14-C3 air valve and tremie pipe A; 15-C3 air valve and tremie pipe B; 16-C4 cyclone cylinder; 17-C5-C4 airduct; 19-C4 air valve and tremie pipe A; 20-C4 air valve and tremie pipe B; 21-dore furnace main body; 22-gooseneck; 23-feed separation and EGR; 24-C5 cyclone cylinder; 25-C5 air valve and tremie pipe; 26-kiln tail smoke-box;
101-tertiary air entrance; The reducing of 102-kiln tail; 103-circumference inverter tube; 104-coal dust cone entrance; 105-dore furnace lower cone; 106-C4 underfeed mouth; 107-coal dust cylinder entrance; Subordinate's reducing in 108-stove; Charging aperture in the middle part of 109-C4; Charging aperture in the middle part of 110-C3; Upper reducing in the middle part of 111-stove; 112-dore furnace main body ammoniacal liquor spout; 201-expansion joint; 202-gooseneck ammoniacal liquor spout; 203-block-proof type, 180 ° of elbows; 204-airduct; 205-reducing bend; 301-cone of gathering materials; 302-air valve; 303-tremie pipe; 304-expansion joint.
Detailed description of the invention
For making the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the utility model is further described.But those skilled in the art know, the utility model is not limited to accompanying drawing and following examples.
One, theoretical foundation of the present utility model and principle
1. according to the law of thermodynamics " heat always by high temp objects spontaneous be transmitted to cryogenic object, there is temperature difference in two kinds of fluids, just must have heat transmission ".For cement suspension preheating system, the heat transmission between its raw material and gas is heat convection.According to heat convection philosophy---Newton's law of cooling, the hot-fluid of heat convection is directly proportional to the temperature difference of fluid and solid wall surface, that is:
Q＝α·(t
m-t
g)·F＝α·Δt·F
Or, q=α (t
m-t
g)=α Δ t
In formula: Q---heat flow (heat output), W;
Q---heat flux (heat flow density), W/m
2;
α---gas-solid heat exchange coefficient, W/ (m
2dEG C);
T
m---powder temperature, DEG C;
T
g---gas temperature, DEG C;
F---gas-solid contact area, m
2.
As can be seen from the above equation: for certain cement precalcining system, its material-strewing device, air velocity duct, raw material fineness (specific area) etc. have been fixed substantially, α and F is substantially constant, gas-solid heat exchange amount is only relevant with the temperature difference, and be directly proportional, so the gas-solid temperature difference is larger, heat exchange rate is higher, and heat exchange amount is larger.
Meanwhile, from heat formula:
Q＝G·C·Δt
In formula: Q---heat, kJ/h;
G---rate-of flow, kg/h, or Nm
3/ h;
C---specific heat, kJ/ (kg DEG C), or kJ/ (Nm
3dEG C);
Δ t---the temperature difference, DEG C.
Also can find out, when rate-of flow is constant, in certain temperature range, very less or almost constant than thermal change, then, the change of heat is directly related with the temperature difference, and is directly proportional.
Therefore, for cement precalcining system, the raw material of low-temperature heat exchange unit are introduced in the heat exchange unit of the high temperature gas flow higher than former heat exchange part, just can form the larger gas-solid heat exchange temperature difference, realize the maximization of heat exchange amount.
2. for powder technology, related documents shows the solid-gas ratio of Analyses on Cyclone Preheater System and the theoretical research of the thermal efficiency: as solid-gas ratio Z<2, solid-gas ratio is very responsive on the impact of the thermal efficiency, increases and increase along with Z value; When 2≤Z≤3.6, solid-gas ratio becomes slow to thermal efficiency impact; As Z>3.6, reduce along with Z value increases the thermal efficiency.
Therefore, the solid-gas ratio improving precalcining system is one of effective way improving gas-solid heat exchange.
Two, system layout of the present utility model
The one that the utility model proposes large temperature difference cross material flow precalcining system, comprises N level Analyses on Cyclone Preheater System, decomposition furnace system and kiln tail smoke-box.The utility model, for the 5 grades of cyclone preheater precalcining systems of the single series shown in Fig. 1, illustrates the structure of this system.This precalcining system comprises 5 grades of cyclone preheaters, superposition multiple spot supplied materials recirculation type dore furnace and kiln tail smoke-box are revolved in spray.Every grade of cyclone cylinder, import airduct and tremie pipe thereof form a heat exchange unit, wherein, cyclone cylinder is made up of spiral case, cylinder, cone and inner core etc., and blast pipe is made up of pipeline, material feeding box and material-strewing device, and tremie pipe is made up of material distributing valve, air valve and pipeline etc.Spray revolve superposition multiple spot supplied materials recirculation type dore furnace by dore furnace main body, gooseneck and feed separation and EGR etc. three part form.Kiln tail smoke-box is connected with the rotary kiln of running by sealing device, is connected with dore furnace bottom by reducing, plays the effect of forming a connecting link, and prevents cold air from entering system, and raw material are entered kiln in time.Each parts are made by steel plate, and inwall lays refractory material and heat-barrier material.
(1) structure of superposition multiple spot supplied materials recirculation type dore furnace is revolved in spray
The design of this dore furnace is: material is from C
n-1cyclone cylinder enters C
nbefore cyclone cylinder, first process through dore furnace.This dore furnace will from C
n-1whole material of cyclone cylinder and C
n-2the partial material of cyclone cylinder and the partial material after this dore furnace process are as carrying out material source, this dore furnace arranges reducing respectively at the upper and lower of the position that these materials enter in stove, and tertiary air entrance and coal powder entrance are set in material front end of running orbit in dore furnace, when kiln discharge high-temperature flue gas enters in dore furnace in the mode of spurting from bottom to top, the effect that whirlwind effect superposes mutually with the effect of spurting of kiln discharge high-temperature flue gas can be reached, thus make the material powder concentration in gas stream in the stove be much higher than import or export concentration, improve material-gas ratio in stove, substantially prolongs material powder and the time of staying of coal dust in stove, and then improve heat exchange efficiency, improve the burnout rate of coal dust.The material entered in dore furnace main body enters gooseneck along flue gas direct of travel, and the partial material in gooseneck enters feed separation and EGR by the inertia moved in flue gas and centrifugal force, and rest materials enters C
ncyclone cylinder, the material in feed separation and EGR enters in dore furnace main body as carrying out one of material source.The utility model can realize spray and revolves superposition, multiple spot supplied materials and recirculation thus.
Here N represents the progression of Analyses on Cyclone Preheater System, C
ncyclone cylinder represents the minimum one cyclonic cylinder that N level Analyses on Cyclone Preheater System cyclone cylinder at different levels arranges from top to bottom, and be C4 concerning 4 grades of preheaters, be C5 concerning 5 grades of preheaters, is C6 concerning 6 grades of preheaters; C
n-1cyclone cylinder represents the penultimate stage cyclone cylinder that N level Analyses on Cyclone Preheater System cyclone cylinder at different levels arranges, C from top to bottom
n-2cyclone cylinder represents the level cyclone cylinder third from the bottom that N level Analyses on Cyclone Preheater System cyclone cylinder at different levels arranges from top to bottom.
Below for the dore furnace that the 5 grades of cyclone preheaters of the single series shown in Fig. 2 are used, illustrate that the structure of superposition multiple spot supplied materials recirculation type dore furnace is revolved in spray.
Dore furnace main body 21 comprises tertiary air entrance 101, kiln tail reducing 102, has an area of in the middle part of subordinate's reducing 108 in inverter tube 103, coal dust cone entrance 104, dore furnace lower cone 105, C4 underfeed mouth 106, coal dust cylinder entrance 107, stove, C4 and go up reducing 111 and furnace main body ammoniacal liquor spout 112 in the middle part of charging aperture 110, stove in the middle part of charging aperture 109, C3.
Gooseneck 22 comprises expansion joint 201, gooseneck ammoniacal liquor spout 202, block-proof type 180 ° of elbows (or vortex type pipeline turning device) 203, airduct 204 and reducing bend 205.Wherein, expansion joint 201 can be arranged as required.
Feed separation and EGR 23 comprise cone 301 of gathering materials, air valve 302, pipeline 303 and expansion joint 304.Wherein, the feed separation principle of described feed separation and EGR 23 mainly comprises: the dust in flue gas by the inherent feature such as gravitational settling, centrifugal force power and inertia effect and dust collection is got off.The cone 301 of gathering materials of described feed separation and EGR 23 comprises: different, cone, polygonal pyramid etc. that angle is different suitable for reading.Wherein, expansion joint 304 can be arranged as required.
Decomposition furnace system is connected to form successively between dore furnace main body 21, gooseneck 22 and feed separation and EGR 23.The kiln tail reducing 102 of dore furnace is connected with kiln tail smoke-box downwards, and reducing bend 205 level is connected with C5 cyclone cylinder.Each parts are manufactured by steel plate, and refractory material is laid in inside.
Below in conjunction with Fig. 1 from decomposition furnace structure, wind, coal, material enter stove mode and denitration mode describes in detail to the utility model.
1. decomposition furnace structure
Bottom and the kiln tail smoke-box connecting portion of dore furnace main body 21 arrange first reducing, i.e. kiln tail reducing 102, make kiln discharge flue gas enter stove in effect of spurting for the first time, form first combustion zone, make fuel decomposition and burning.Setting party's circle transformation pipe 103 above kiln tail reducing 102.Dore furnace body interior arranges two reducings, namely reducing 111 is gone up in the middle part of subordinate's reducing 108 and stove in stove, make the flue gas in dore furnace in second time and effect of spurting for the third time, accelerate the mixing of air-flow and raw material, whipping process, and form Liang Ge subsequent combustion district, under lower excess air, coal dust is burnt completely, accelerate the heat exchanging process with raw material.
The top of dore furnace main body 21 is connected with gooseneck 22, the effect of gooseneck is when not increasing frame height, such as by block-proof type 180 ° of elbows (or vortex type pipeline turning device) 203 and airduct 204, be connected with the minimum one cyclonic cylinder of pre-heating system, effectively utilize the space of preheater framework, increase dore furnace volume, extend the time of staying of material in dore furnace, improve the resolution ratio into kiln raw material.
Be connected with cone 301 of gathering materials with the minimum one cyclonic cylinder of Analyses on Cyclone Preheater System downwards at gooseneck 22, the inertia that cone of gathering materials 301 utilizes material to move in flue gas and centrifugal force collect out the part high-temperature material (accounting for 25% ~ 30% of total amount) in kiln gas, and by material by air valve 302, pipeline 303 grade sends into the top of dore furnace lower cone 105, recycle in dore furnace inside, reach and improve raw material heat exchange efficiency, improve meal calcining rate, stablize dore furnace operation, and reach the high-temperature material accumulation eliminated bottom reducing bend 205, the object of blocking and skinning.
2. wind, coal, material enter stove mode
(1) kiln gas and tertiary air enter stove mode
Kiln discharge high-temperature flue gas enters dore furnace lower cone 105 by kiln tail reducing 102 in the mode of spurting from bottom to top, by the gas of dore furnace lower cone surrounding and material powder and coal dust constantly entrainment, upwards spray, cause many by the extrorse vortex in center, formation is spurted effect, greatly extend material powder and the time of staying of coal dust in stove, accelerate various chemical reaction.
Tertiary air entrance 101 is arranged in the mode of downward-sloping certain angle (10 ° ~ 15 °), tertiary air enters dore furnace main body 21 inside along tertiary air entrance 101 from the upper end of dore furnace lower cone 105 with tangential way, in stove, cycle is advanced, in whirlwind effect.
The whirlwind effect of tertiary air superposes mutually with the effect of spurting of kiln discharge flue gas, significantly extend the material time of staying of powder in stove, make the material powder concentration in gas stream in the stove be much higher than import or export concentration, improve material-gas ratio, and then raising heat exchange efficiency, accelerate various chemical reaction.This air inlet mode, makes to obtain between kiln discharge exhaust gas volumn and tertiary air quantity to balance on the one hand, makes decomposition furnace structure simple on the other hand, facilitates technology arrangement, decrease skinning in stove.
(2) coal dust enters stove mode
Coal dust sprays into from coal dust cone entrance 104 and coal dust cylinder entrance 107 respectively, and two coal injection pipes of each entrance tangentially spray into the circumferencial direction of asymmetric manner along a certain diameter, forms whirlwind effect.Preferably, the coal dust that coal dust cone entrance 104 sprays into accounts for 15% ~ 30% of dore furnace coal consumption, and the coal dust that coal dust cylinder entrance 107 sprays into accounts for 70% ~ 85% of dore furnace coal consumption.
Form reducing atmosphere after the kiln gas of the coal dust and anoxic that spray into dore furnace lower cone contacts, reduce the part NO in kiln discharge flue gas
x, inhibit NO in dore furnace
xgeneration, reduce the NO of system
xconcentration of emission.
The dore furnace cylinder of major part coal dust above tertiary air is tangentially to spray into, form whirlwind effect, extend the time of staying that coal dust enters dore furnace the initial segment, make it rapid heating, on fire, pre-burning, decompose immediately, be oxidized and burn under excess oxygen, its heat passes to rapidly the raw material in suspended state, meets the requirement that raw material decompose.
To the fire coal of low volatile, adopt dore furnace burner special, strengthen wind, coal mixing further; According to the difference of production scale, dore furnace coal consumption, coal and ature of coal, coal powder injection point position and quantity are adjusted.
Respectively enter the position close fit of coal position and tertiary air, reasonable Arrangement.
(3) raw material enter stove mode
The supplied materials path that the utility model adopts with enter stove mode and traditional supplied materials path and enter stove mode different, dore furnace raw material of the present utility model to enter dore furnace above subordinate's reducing 108 from C3, C4 and feed separation and EGR 23, C3 supplied materials from charging aperture 110 in the middle part of C3 respectively; C4 supplied materials both can all enter above dore furnace lower cone 105 from C4 underfeed mouth 106, also can a part enter dore furnace above subordinate's reducing 108 from charging aperture 109 in the middle part of C4, another part enters above dore furnace lower cone 105 from C4 underfeed mouth 106; The supplied materials of feed separation and EGR 23 enters above dore furnace lower cone 105.Each point supplied materials is suspended in immediately after entering stove and spurts and among vortex sheet, accelerate the heat exchanging process with raw material.
According to the difference of stove ature of coal, height above sea level natural environment, the doses of coming of each charging aperture of C3 and C4 carries out ratio adjustment by the material distributing valve under cyclone cylinder, and the ratio that C3 carrys out doses is preferably 0 ~ 50% adjustable.When stove ature of coal is better, send into C4 and feed separation and EGR 23 supplied materials above dore furnace lower cone 105 while, the less C3 supplied materials of sub-material ratio is sent into above subordinate's reducing 108 from dore furnace, utilize the large temperature difference heat exchange that C3 low temperature material and furnace high-temperature gas are formed, absorb the heat content of furnace gas, reduce decomposition furnace outlet temperature; When using low quality coal or anthracite, while above C4 and feed separation and EGR 23 supplied materials feeding dore furnace lower cone 105, C3 and C4 supplied materials is sent into above subordinate's reducing 108 from dore furnace, with the heat content of high-temperature region gas in more absorption furnace, eliminate owing to moving the problems such as the localized hyperthermia that causes and skinning behind main combustion zone when using low quality coal or anthracite, simultaneously, also decomposition furnace outlet temperature is reduced, effectively prevent dore furnace and C5 cyclone cylinder temperature is hung upside down, and the high temperature blocking of C5 cyclone cylinder.
Each feed points and tertiary air, the position entering coal carry out close fit, reasonable Arrangement.
According to aforementioned, the mode of dore furnace and the running status in dore furnace are entered to wind, coal, material, the key technology that the utility model uses is three whirlwind (1 tertiary air, 2 coal dusts), spurt for three times (in the reducing of kiln tail, dore furnace upper reducing in the middle part of subordinate's reducing and stove) and three carry out material source (C3, C4, feed separation and EGR).
3. denitration mode
The excess air coefficient of kiln discharge flue gas is less (generally 1.05 ~ 1.10), sprays into 15% ~ 30% of stove coal consumption at dore furnace lower cone, coal dust cracking when anoxic, burning, generates H
2, CO and C
mh
ndeng reducibility gas, Al in raw material
2o
3and Fe
2o
3as catalyst, by the NO in kiln discharge flue gas
xbe replaced as N
2and H
2the innocuous gas such as O, the NO in the waste gas that pre-heating system is discharged
xcontent reduces by 100 ~ 150ppm.When environmental protection standard requires strict, according to the height of calciner temperature, the top of reducing in the middle part of dore furnace, such as furnace main body ammoniacal liquor spout 112, such as, or gooseneck ascending tube position arranges ammoniacal liquor and sprays into a little, and gooseneck ammoniacal liquor spout 202, makes ammoniacal liquor and NO
xreaction, thus reduce NO
xconcentration of emission.
(2) overall structure of system
As shown in Figure 1, rotary kiln is connected with kiln tail smoke-box 26; Tertiary-air pipe is connected with the tertiary air import of dore furnace 21 cone upper end; Pulverized coal channel is connected (as shown in Figure 2) with the top coal feed point of dore furnace 21 cone middle and lower part and tertiary air entrance respectively; C1 cyclone cylinder air outlet is connected with system exhaust blower.
The kiln tail reducing of dore furnace 21 is connected with kiln tail smoke-box 26 downwards, and dore furnace gooseneck 22 is connected with the air inlet of C5 cyclone cylinder 24, and the reducing bend bottom of gooseneck 22 is connected with the underfeed mouth of dore furnace 21 through dore furnace feed separation and EGR 23.
The feed opening of C5 cyclone cylinder 24 is connected with the charging aperture of kiln tail smoke-box 26 through C5 air valve and tremie pipe 25, and the air outlet of C5 cyclone cylinder 24 is connected through the air inlet of C5-C4 airduct 17 with C4 cyclone cylinder 16.
The feed opening of C4 cyclone cylinder 16 is connected with material distributing valve 18 through tremie pipe, two C4 air valves that material distributing valve 18 exports and tremie pipe 19,20 thereof are connected with the underfeed mouth of dore furnace 21 and middle part charging aperture respectively, and the air outlet of C4 cyclone cylinder 16 is connected through the air inlet of C4-C3 airduct 12 with C3 cyclone cylinder 11.
The feed opening of C3 cyclone cylinder 11 is connected with material distributing valve 13 through tremie pipe, two C3 air valves that material distributing valve 13 exports and tremie pipe 14,15 thereof are connected with the charging aperture in the middle part of C5-C4 airduct 17 Sum decomposition stove 21 respectively, and the air outlet of C3 cyclone cylinder 11 is connected through the air inlet of C3-C2 airduct 6 with C2 cyclone cylinder 3.
The feed opening of C2 cyclone cylinder 3 is connected with material distributing valve 8 through tremie pipe, two C2 air valves that material distributing valve 8 exports and tremie pipe 9,10 thereof are connected with C4-C3 airduct 12 and C5-C4 airduct 17 respectively, and the air outlet of C2 cyclone cylinder 3 is connected through the air inlet of C2-C1 airduct 2 with C1 cyclone cylinder 1.
The feed opening of two C1 cyclone cylinders 1 different tremie pipe of respectively hanging oneself is connected with two material distributing valves 4 respectively, the outlet of each material distributing valve 4 is divided into two-way, the C1 air valve having a way outlet respectively to hang oneself different in each material distributing valve outlet and blanking pipe A5 are connected with C3-C2 airduct 6, the tremie pipe of two-way outlet unites two into one in addition, is connected with C4-C3 airduct 12 through C1 air valve and tremie pipe B7.
(3) method flow of the present utility model
As shown in Figure 1, the utility model precalcining system carries out preheating predecomposition method and comprises the following steps:
Raw material from raw material homogenizing silo enter in C2-C1 airduct 2 after Weighing, meet with the thermal updrafts from C2 cyclone cylinder 3 air outlet and carry out heat exchange, when thermal current carries after raw material enter C1 cyclone cylinder 1, be forced in the spiral case of cyclone cylinder and the intercropping rotational flow of inner core, and rotate while move downward, by cylindrical shell to cone, extend to the end of cone, then transfer to rotate to rise, air-flow is discharged by inner core.
Raw material by air-flow carry make rotational flow time, because raw material density is greater than gas density, by centrifugal action, raw material are to the speed of edge movement much larger than gas, cause and increase near wall place, limit concentration, simultaneously due to viscosity resistance effect, wall place, limit fluid velocity reduces, suspension resistance is reduced greatly, raw material sedimentation and separated from the gas.
The raw material completing Conveyance collection are divided into two-way (0 ~ 50% is adjustable) by material distributing valve, leading up to C1 air valve and tremie pipe A5 enters in C3-C2 airduct 5, meet with the thermal current of C3 cyclone cylinder 11 air outlet, carry out most heat exchange instantaneously, enter in C2 cyclone cylinder 3 with air-flow, large temperature difference heat exchange then by C1 air valve and tremie pipe B7, is carried out in cross-entry C4-C3 airduct 12 in another road.
In like manner, complete Conveyance in C2 cyclone cylinder 3 after, air-flow is discharged from air outlet, the raw material collected are divided into two-way (0 ~ 50% is adjustable) by material distributing valve 8, leading up to C2 air valve and tremie pipe A9 enters in C4-C3 airduct 12, and together with the supplied materials of C1 air valve and tremie pipe B7, after the thermal current come with C4 cyclone cylinder 16 air outlet carries out heat exchange, brought in C3 cyclone cylinder 11 by air-flow, large temperature difference heat exchange then by C2 air valve and tremie pipe B10, is carried out in cross-entry C5-C4 airduct 17 in another road.
In C3 cyclone cylinder 11 complete Conveyance after, air-flow is discharged from air outlet, heat exchange is carried out with the supplied materials of upper level cyclone cylinder feed opening, raw material are then also divided into two-way (0 ~ 50% is adjustable) by material distributing valve 13, wherein a road is in the middle part of C3 air valve and tremie pipe B15 cross-entry dore furnace 21, large temperature difference heat exchange is carried out in dore furnace main body, another road raw material enter in C5-C4 airduct 17 through C3 air valve and tremie pipe A14, and together with the supplied materials of C2 air valve and tremie pipe B10, carry out heat exchange with the thermal current of C5 cyclone cylinder 24 air outlet.
After heat exchange, raw material enter in C4 cyclone cylinder 16 under the carrying of thermal current, complete Conveyance, air-flow is discharged from its air outlet, raw material are then collected and are divided into two-way (adjustable 0 ~ 50%) by material distributing valve 18, leading up to C4 air valve and tremie pipe A19 enters dore furnace 21 bottom, separately leads up to C4 air valve and tremie pipe B20 to enter in the middle part of dore furnace 21.
After dore furnace 21 Inner carries out the decomposition of the heat exchange of gas material and carbonate, raw material enter in C5 cyclone cylinder 24 with air-flow by dore furnace gooseneck major part, simultaneously, due to the effect of centrifugal force, fraction raw material (accounting for 25% ~ 30%) enter dore furnace by feed separation and EGR 23, achievement unit divides the recirculation of high temperature raw material of coming out of the stove, make undecomposed raw material and do not fire clean coal dust further heat exchange and burning in dore furnace, directly increasing in stove while solid-gas ratio, improve the burnout rate of meal calcining rate and coal dust to greatest extent, stabilize the thermal regulation of dore furnace, reduce the thermic load of rotary kiln, improve grog yield and quality.
After completing Conveyance collection in C5 cyclone cylinder 24, raw material enter kiln tail smoke-box 26 through its air valve and tremie pipe 25, enter in rotary kiln subsequently and calcine.
In whole Analyses on Cyclone Preheater System, every grade of cyclone cylinder, blast pipe and tremie pipe thereof form a heat exchange unit, and from top to bottom, heat smoke carries out countercurrent heat exchange from bottom to top to raw material.Tremie pipe is provided with material-strewing device with the connecting portion being connected airduct, when object is that the raw material that higher level's cyclone cylinder is got off enter airduct, gravitate is punched on dispersion device and splashes, raw material are disperseed rapidly and fully, uniformly be distributed among subordinate's cyclone cylinder thermal current out, increase heat exchange area, realize the high efficient heat exchanging of raw material.The effect of air valve is both to keep the isolated raw material of higher level's cyclone cylinder unimpededly to enter airduct by tremie pipe, can prevent again subordinate's cyclone cylinder thermal current out from scurrying into higher level's cyclone cylinder via tremie pipe short circuit to greatest extent, avoid causing the secondary fly-up being separated raw material, the separative efficiency reducing cyclone cylinder.
One of improvement of the present utility model is by reallocating to the raw material of Analyses on Cyclone Preheater System 4 cyclone cylinder feed openings, a part of raw material are made to change original heat exchange position, large temperature difference heat exchange is carried out in the heat exchange unit of the next stage that cross-entry gas flow temperature is higher, improve heat exchange efficiency, reduce the waste gas outlet temperature of system.
Dore furnace is as the thermal apparatus of fuel combustion and raw material carbonate decomposition, its Main Function guarantees fuel Thorough combustion in stove, and make the endothermic process of the exothermic process of fuel and raw material carbonate decomposition wherein promptly to carry out under suspended state, guarantee higher to enter kiln meal calcining rate, therefore, dore furnace carries important function in systems in which.
Two of improvement of the present utility model is that dore furnace have employed spray and revolves superposition multiple spot supplied materials recirculation type dore furnace.It by dore furnace furnace main body, gooseneck and feed separation and EGR etc. three part form.Enter tertiary air and the eddy airstream of coal wind formation, the thermal current that spurts of kiln tail reducing Sum decomposition furnace interior reducing formation of dore furnace, be suspended in immediately after Shi Ge road supplied materials enters stove among the floor that spurts, accelerate the heat exchanging process with raw material, and, the whirlwind effect of tertiary air superposes mutually with the effect of spurting of kiln discharge flue gas, significantly extend the material time of staying of powder in stove, the material powder concentration in gas stream in the stove is made to be much higher than import or export concentration, improve solid-gas ratio, and then raising heat exchange efficiency, accelerate various chemical reaction; By the reallocation of cyclone cylinder outlet raw material, a part of raw material of C3 and C4 cyclone cylinder feed opening are fed in the middle part of dore furnace, realize large temperature difference heat to exchange, at raising heat exchange efficiency, while reducing decomposition furnace outlet temperature, prevent the appearance owing to moving the problem such as localized hyperthermia and skinning in the middle part of the dore furnace that causes behind combustion zone when using low quality coal or anthracite, guarantee the security of operation of dore furnace, adapt to low quality coal for dore furnace or anthracitic use provides necessary technical guarantee; The a part of high-temperature material gone out in kiln gas is then separated by feed separation and EGR, and feed in dore furnace and recycle, directly improving in stove while solid-gas ratio, improve the burnout rate of meal calcining rate and coal dust to greatest extent, stabilize the thermal regulation of firing system, reduce the thermic load of rotary kiln, improve grog yield and quality, simultaneously, the problems such as the smooth and system of the accumulation of high-temperature material bottom reducing bend, blocking and skinning, ventilation that eliminates is unstable, improve system running rate, reduce production cost.
" sub-material " described in the utility model both by cyclone cylinder at different levels sub-material use simultaneously, also can the independent sub-material of single cyclone cylinder can use.
Precalcining system described in the utility model, comprises single series preheater and bi serie preheater.
The utility model is applicable to the transformation of newly-built and existing cement precalcining system, also can be used for the powder heat-exchange system in the industry such as metallurgy, chemical industry.
The utility model, by above-mentioned means, is intended to improve raw material heat exchange efficiency, reduces system off gas temperature, improve meal calcining rate, stablize kiln system thermal regulation, improve system running rate, improve grog yield and quality.
Below with height above sea level 1700m, clinker 2500t/d, heat consumption of clinker 760kcal/kg-cl, the condition of grog substep power consumption 38kWh/t-cl is example, to adopting the system of original dore furnace and adopting the key technical indexes of the system of the utility model dore furnace to carry out comparison, comparison result is as shown in the table:
Remarks: original system calculates according to 2500t/d, patent system calculates according to sub-material 20%, circulation 25%.
According to running calculating in 310 days year, year volume increase 7.750 ~ 11.625 ten thousand tons, grog, year economize on electricity 267 ~ 3,840,000 kWh, year saves standard coal 2248 ~ 3488 tons, and year reduces CO
2discharge capacity 6698 ~ 10296 tons, year reduces SO
2discharge capacity 62 ~ 95 tons, year reduces NOx discharge 183 ~ 358 tons, and year increases total profit more than 762 ~ 1,139 ten thousand yuan, improves grog yield and quality, reduces energy consumption, achieve environmental emission reduction, economic benefit and obvious environment benefit.
Above, embodiment of the present utility model is illustrated.But the utility model is not limited to above-mentioned embodiment.All within spirit of the present utility model and principle, any amendment made, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (8)
1. a large temperature difference cross material flow precalcining system, this precalcining system comprises Analyses on Cyclone Preheater System, decomposition furnace system and kiln tail smoke-box, Analyses on Cyclone Preheater System comprises N level cyclone cylinder, flue gas from rotary kiln is discharged from decomposition furnace system after kiln tail smoke-box, then sequentially flow to the 1st grade of cyclone cylinder by airduct from N level cyclone cylinder, and finally discharged by the air outlet of the 1st grade of cyclone cylinder; It is characterized in that, other cyclone cylinders except N level cyclone cylinder include material distributing valve, each via material distributing valve, the partial material in feed opening is sent into the cyclone cylinder import airduct of one-level low than it to N-2 level cyclone cylinder for 1st grade, by cyclone cylinder import airduct higher for the flue-gas temperature of another part material feeding comparatively this rudimentary cyclone cylinder or decomposition furnace system; The charging aperture of the diverse location in decomposition furnace system sent into by material in its feed opening by N-1 level cyclone cylinder by material distributing valve; Thus the gas-solid temperature difference increased in each cyclone cylinder import airduct Sum decomposition furnace system; Wherein, the adjustment proportion of each material distributing valve is 0 ~ 50%;
Here N represents the progression of cyclone cylinder in Analyses on Cyclone Preheater System, and in Analyses on Cyclone Preheater System, each cyclone cylinder arranges from top to bottom, and the 1st grade of cyclone cylinder represents cyclone cylinder at the highest level, is called for short C1 cyclone cylinder; N-2 level cyclone cylinder represents level cyclone cylinder third from the bottom, is called for short C
n-2cyclone cylinder; N-1 level cyclone cylinder represents penultimate stage cyclone cylinder, is called for short C
n-1cyclone cylinder; N level cyclone cylinder represents minimum one cyclonic cylinder, is called for short C
ncyclone cylinder.
2. precalcining system as claimed in claim 1, it is characterized in that, this decomposition furnace system is that superposition multiple spot supplied materials recirculation type dore furnace is revolved in spray, and this dore furnace comprises dore furnace main body (21), gooseneck (22) and feed separation and EGR (23); Wherein, C
n-2partial material in cyclone cylinder feed opening sends into C
ncyclone cylinder outlet conduit, dore furnace main body (21) sent into by another part material;
C
n-1whole materials in cyclone cylinder feed opening, C
n-2material in this another part material in cyclone cylinder feed opening and feed separation and EGR (23) enters in dore furnace main body (21) as the material source of dore furnace, this dore furnace main body (21) arranges reducing respectively at the upper and lower of the position that these materials enter in stove, and enter into the position in stove at material the tertiary air entrance and the coal powder entrance that to enter dore furnace with tangential direction are set along the front end of flue gas direct of travel, when flue gas enters in dore furnace in the mode of spurting from bottom to top from kiln tail smoke-box (26), the effect that the effect of spurting of the whirlwind effect and flue gas that can reach tertiary air and coal dust superposes mutually, wherein, the reducing that the below, the material place of entering of feed separation and EGR (23) is arranged is kiln tail reducing (102), and this kiln tail reducing is connected with this kiln tail smoke-box downwards,
Material in dore furnace main body (21) enters gooseneck (22) with flue gas, partial material in gooseneck (22) enters feed separation and EGR (23) by the inertia moved in flue gas and centrifugal force, and rest materials enters C with flue gas
ncyclone cylinder, this partial material entering feed separation and EGR (23) is the material in described feed separation and EGR (23).
3. precalcining system as claimed in claim 2, it is characterized in that, this dore furnace main body (21) comprises tertiary air entrance (101), this kiln tail reducing (102), coal dust cone entrance (104), dore furnace lower cone (105), C
n-1subordinate's reducing (108) in underfeed mouth (106), coal dust cylinder entrance (107), stove, C
n-1middle part charging aperture (109), C
n-2reducing (111) is gone up in the middle part of middle part charging aperture (110) and stove;
Lower end and the upper end that reducing (111) is separately positioned on dore furnace main body (21) middle part is gone up in the middle part of subordinate's reducing (108) and stove in stove;
Dore furnace lower cone (105) is positioned at dore furnace main body (21) bottom, and the material in feed separation and EGR (23) enters the top of dore furnace lower cone (105);
Tertiary air enters dore furnace main body (21) inside from the upper end of dore furnace lower cone (105) with tangential way along the tertiary air entrance (101) of downward-sloping setting, and in stove, cycle is advanced, in whirlwind effect;
This kiln tail reducing (102) is positioned at the lower end of dore furnace lower cone (105);
Coal dust cone entrance (104) is positioned on dore furnace lower cone (105), and coal dust cylinder entrance (107) is arranged on the dore furnace cylinder between dore furnace lower cone (105) and stove subordinate reducing (108); Coal dust sprays into from coal dust cone entrance (104) and coal dust cylinder entrance (107) respectively, and two coal injection pipes of each entrance tangentially spray into the circumferencial direction of asymmetric manner along a certain diameter, forms whirlwind effect;
C
n-1underfeed mouth (106) is positioned at dore furnace lower cone (105) top and close dore furnace lower cone (105), C
n-1middle part charging aperture (109) is arranged in stove subordinate reducing (108) top and close stove subordinate reducing (108); C
n-1material in cyclone cylinder feed opening is all from C
n-1underfeed mouth (106) enters dore furnace lower cone (105) top; Or a part is from C
n-1middle part charging aperture (109) enters subordinate's reducing (108) top in dore furnace, and another part is from C
n-1underfeed mouth (106) enters dore furnace lower cone (105) top;
C
n-2middle part charging aperture (110) is arranged in stove subordinate reducing (108) top and close stove subordinate reducing (108), C
n-2this another part material in cyclone cylinder feed opening is from C
n-2middle part charging aperture (110) enters subordinate's reducing (108) top in dore furnace.
4. precalcining system as claimed in claim 3, it is characterized in that, this gooseneck (22) comprises gooseneck ammoniacal liquor spout (202), block-proof type 180 ° of elbows (203), airduct (204) and reducing bend (205); Wherein,
Gooseneck ammoniacal liquor spout (202) is positioned on gooseneck ascending tube;
This gooseneck (22) is connected with dore furnace main body (21) top, by airduct (204) and C by block-proof type 180 ° of elbows (203)
ncyclone cylinder connects;
Reducing bend (205) level and cyclone cylinder C
nconnect.
5. precalcining system as claimed in claim 4, is characterized in that, described block-proof type 180 ° of elbows (203) replace with vortex type pipeline turning device.
6. the precalcining system as described in claim 4 or 5, is characterized in that, feed separation and EGR (23) comprise cone of gathering materials (301), air valve (302) and pipeline (303); Wherein,
Material in gooseneck (22) enters C respectively
ncyclone cylinder and cone (301) of gathering materials, the top of dore furnace lower cone (105) sent into by the material entering cone of gathering materials (301) by air valve (302), pipeline (303).
7. the precalcining system as described in claim 3 or 4, it is characterized in that, the top of reducing in the middle part of dore furnace (111) arranges furnace main body ammoniacal liquor spout (112), and/or gooseneck ammoniacal liquor spout (202) is set at gooseneck (22) ascending tube position, make ammoniacal liquor and NO
xreaction, thus reduce NO
xconcentration of emission.
8. precalcining system as claimed in claim 2, is characterized in that, when the progression of described N level cyclone cylinder is 5 grades, i.e. and C1 cyclone cylinder, C2 cyclone cylinder, C3 cyclone cylinder, C4 cyclone cylinder and C5 cyclone cylinder; Wherein,
Gooseneck (22) is connected with the air inlet of C5 cyclone cylinder (24), and the reducing bend bottom of gooseneck (22) is connected with the underfeed mouth of dore furnace main body (21) through feed separation and EGR (23);
The feed opening of C5 cyclone cylinder (24) is connected with the charging aperture of kiln tail smoke-box (26) through C5 air valve and tremie pipe (25), and the air outlet of C5 cyclone cylinder (24) is connected through the air inlet of C5-C4 airduct (17) with C4 cyclone cylinder (16);
The feed opening of C4 cyclone cylinder (16) is connected with material distributing valve (18) through tremie pipe, two C4 air valves that material distributing valve (18) exports and tremie pipe (19,20) thereof are connected with the underfeed mouth of dore furnace main body (21) and middle part charging aperture respectively, and the air outlet of C4 cyclone cylinder (16) is connected through the air inlet of C4-C3 airduct (12) with C3 cyclone cylinder (11);
The feed opening of C3 cyclone cylinder (11) is connected with material distributing valve (13) through tremie pipe, two C3 air valves that material distributing valve (13) exports and tremie pipe (14,15) thereof are connected with the charging aperture at C5-C4 airduct (17) Sum decomposition furnace main body (21) middle part respectively, and the air outlet of C3 cyclone cylinder (11) is connected through the air inlet of C3-C2 airduct (6) with C2 cyclone cylinder (3);
The feed opening of C2 cyclone cylinder (3) is connected with material distributing valve (8) through tremie pipe, two C2 air valves that material distributing valve (8) exports and tremie pipe (9,10) thereof are connected with C4-C3 airduct (12) and C5-C4 airduct (17) respectively, and the air outlet of C2 cyclone cylinder (3) is connected through the air inlet of C2-C1 airduct (2) with C1 cyclone cylinder (1);
C1 cyclone cylinder is two, the feed opening of these two C1 cyclone cylinders (1) different tremie pipe of respectively hanging oneself is connected with a material distributing valve (4) respectively, the outlet of each material distributing valve (4) is divided into two-way, the C1 air valve having a way outlet respectively to hang oneself different in each material distributing valve outlet and tremie pipe A (5) are connected with C3-C2 airduct (6), in two material distributing valve outlets, the tremie pipe of two-way outlet unites two into one in addition, is connected with C4-C3 airduct (12) through C1 air valve and tremie pipe B (7).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106152774A (en) * | 2015-08-11 | 2016-11-23 | 甘肃土木工程科学研究院 | A kind of spray rotation superposition multiple spot supplied materials recirculation type dore furnace |
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2015
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106152774A (en) * | 2015-08-11 | 2016-11-23 | 甘肃土木工程科学研究院 | A kind of spray rotation superposition multiple spot supplied materials recirculation type dore furnace |
| CN106152774B (en) * | 2015-08-11 | 2018-02-09 | 甘肃土木工程科学研究院 | One kind spray rotation superposition multiple spot supplied materials recirculation type dore furnace |
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