CN2573977Y - Decomposing furnace with double vortex preburning chamber - Google Patents
Decomposing furnace with double vortex preburning chamber Download PDFInfo
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- CN2573977Y CN2573977Y CN 02282211 CN02282211U CN2573977Y CN 2573977 Y CN2573977 Y CN 2573977Y CN 02282211 CN02282211 CN 02282211 CN 02282211 U CN02282211 U CN 02282211U CN 2573977 Y CN2573977 Y CN 2573977Y
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- coal
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Abstract
The utility model relates to a decomposing furnace with double vortex precombustion chambers, which is mainly composed of two vortex precombustion chambers connected with the front and the back parts of a double-jetting main furnace in series into a furnace group, wherein the lower ends of the vortex precombustion chambers are respectively connected with inclined flues, and the lower ends of the inclined flues are connected with both sides below the double-jetting main furnace; the upper end of each of the vortex precombustion chambers is provided with an air inlet, materials and coal powder spiral casing, and the sides of the spiral casings are connected with tangential air inlets for hot tertiary air coming from a kiln head; the upper parts of the spiral casings are provided with coal powder inlets, and the tangential air inlets are also connected with flowing tubes for preheating materials; the lower ends of the spiral casing are connected with the upper ends of the vortex precombustion chambers. The decomposing furnace adopts a double-precombustion chamber structure, has obviously better distribution evenness of materials than that of a single-precombustion chamber structure, can effectively enhance the volume utilization of the decomposing furnace, and solves the problem of difficult application of low-grade coal. The production practice indicates that when the utility model adopts coal calcining cement clinker with low volatile matter, for a cement plant with the production scale of 1000t/d, the coal fee item can nearly save the cost of three million yuan one year.
Description
Technical field
The utility model belongs to the cement manufacture plant dore furnace, particularly a kind of dore furnace with bispin stream precombustion chamber.
Background technology
Dore furnace is to adopt suspension preheating predecomposition technology (NSP) to produce the core technology equipment of cement, have the dore furnace of all polymorphic types at present in the world, but most only being applicable to uses the fuel (as middle and high fugitive constituent bituminous coal, heavy oil, natural gas etc.) that more easily catches fire with after-flame, and can be applicable to that difficulty is caught fire, the low-volatile coal of difficult after-flame (containing anthracite) or other low-grade fuel person for number very less and come with some shortcomings, if any, equipment big to the material bad adaptability of collapsing, the easy skinning of vertical heating flue that has, the need volume that has heavy or the like.Along with the reasons such as needs of scientific and technological progress, industrial development, using energy source and fuel price and market competition, quality coal is preferably mostly supplied with coal chemical industry and metallurgical industry use, and cement rotary kiln is more and more poor with the coal quality.Current existing increasing rotary kiln cement factory requires to use cheap low-volatile bituminous coal even anthracite as the burning clinker of cement coal, enriches the decomposition type of furnace that is adapted to this class low-grade fuel so be necessary to innovate, improve or develop.
Summary of the invention
Technical problem to be solved in the utility model is: a kind of dore furnace with bispin stream precombustion chamber is provided, the fine adaptation of dore furnace energy uses low-volatile coal or low grade coal also is can overcome some weak point of existing dore furnace to satisfy the production needs, the material distributing homogeneity on the assurance clinker large-scale production line in the big stove of the dore furnace major ingredient directly in order to solve.
The technical solution of the utility model is:
A kind of dore furnace with bispin stream precombustion chamber, it is characterized in that: it mainly is connected into a stove group by two vortex precombustion chambers 2 with two main stove 1 front and back of spurting and constitutes, the lower end of two vortex precombustion chambers is connected with oblique flue 3 respectively, and tiltedly the flue lower end is connected the both sides of two main stove belows of spurting; There is the spiral case 8 of air intake, material and coal dust the upper end of each vortex precombustion chamber, and the spiral case sidepiece is the tangent air inlet 6 that connects from the tertiary air of kiln head heat; The into inlet 5 of coal dust is arranged at spiral case top, and tangent air inlet also connects the elephant trunk 4 of pre-thermal material; The spiral case lower end connects the vortex precombustion chamber upper end.
The utility model main feature advantage is as follows: in the top-down vortex precombustion chamber of gas, material and fuel, the adherent rotation of material, can play protection land lining, the lower material concentration in middle part helps fuel high temperature brightness flame conflagration in pure air, and suitable high temperature combustion zone can significantly shorten the tail-off time of coal; Vortex precombustion chamber top construction shape can be impelled the optimization in more even distribution of material Yan Bi and flow field, allows middle part flame to reach higher temperature and higher coal dust after-flame degree; When material material of collapsing prolongs oblique flue and can rush at two main stoves or through main stove lower inlet rotary kiln of spurting, and no offline model dore furnace or the duct type dore furnace material that collapses easily blocks up the anxiety of tertiary-air pipe; Can adopt special multicenter combustor, flexible modulation flame profile and nozzle location guarantee the steady combustion of low-volatile coal and regulate and control fuel combustion speed; Vortex precombustion chamber can be arranged near the interior two main stoves that spurt of preheater pylon usually, and connecting airduct does not have skinning usually, need not cleaning; Adopt Flow Field Distribution rationally, turbulent flow and the stronger two stoves that spurt of the eddy current stove of deciding, can bring into play the overall efficiency of stove group preferably, reach required coal dust burn-off rate and raw material resolution ratio;
This dore furnace adopts two pre-combustion chambers, and from cold model experiment, the obviously more single precombustion chamber of material distributing homogeneity is good in its main stove of dore furnace of the two precombustion chambers of band, can improve the capacity utilization of dore furnace effectively.
Dore furnace of the present invention has been widened cement industry coal scope, has solved the difficult problem that low grade coal is used.Production practices show, adopt the low volatile coal calcination clinker, and for the cement plant that a production scale is 1000t/d, only coal takes nearly 3,000,000 yuan of 1 year escapable cost.Description of drawings
Fig. 1 is the structural representation of the dore furnace of band bispin stream precombustion chamber
The specific embodiment
Accompanying drawing 1 is seen in the structural representation of the dore furnace of band bispin stream precombustion chamber of the present invention.It mainly is connected into a stove group by two vortex precombustion chambers 2 with two main stove 1 front and back of spurting and constitutes.Tertiary air from the heat of kiln hood divides two-way tangentially to enter two vortex precombustion chambers by spiral case 8 tangent air inlets 6 respectively; Coal dust adopts special burner to spray into precombustion chamber and stable ignition and conflagration in the hot environment of pure air; Pre-thermal material from upper level whirlwind tube feeds precombustion chamber tertiary air tangent air inlets 6 by elephant trunk 4; Unburnt coal dust and material enter through oblique flue 3 from precombustion chamber and continue the main stove to decompose while burn, come out of the stove at last to enter final stage whirlwind tube and carry out after the gas solid separation preheating and feed in the rotary kiln near the full material that decomposes; The revolution kiln tail gas directly sprays into two main furnace bottoms and mix with the hot gas of precombustion chamber and to come out of the stove of spurting through main stove reducing 7.
Main points of the present invention and characteristics: key of the present invention is to have adopted to low-volatile coal (containing anthracite) or low-grade fuel is adaptable, can stable ignition, the offline model vortex precombustion chamber of conflagration and efficient strong turbulence, many eddy current two spurt that main stove is tied mutually and the stove group, can adapt to low activity fuel after-flame and material resolution ratio and reach 90% or above need, fastidious meticulously on air inlet, feeding, hello coal position and planform and running parameter, with the stable ignition of assurance coal dust and the overall efficiency and the safe operation of conflagration and stove group.Certainly, in addition still need measures such as cooperating raising fineness of pulverized coal, raising tertiary air temperature to guarantee the stable ignition and the after-flame of low activity coal dust.
Test shows adopts two precombustion chambers to make the interior material distribution of main stove obviously good than single pre-burner.
Dore furnace of the present invention is seen with the pluses and minuses comparison sheet 1 of the existing representational type of furnace
The contrast of table 1 dore furnace of the present invention and several representative dore furnaces
| The dore furnace pattern | The basic index parameter | Essential characteristic | Pluses and minuses |
| Dore furnace of the present invention | 1. main stove sectional wind velocity: 7～10m/s precombustion chamber sectional wind velocity: 6～10m/s, 2. residence time of material, 10～21s, 3. operating temperatures: main stove: 870～920 ℃ of precombustion chambers: 850～1300 ℃ of 4. material resolution ratio 85～95% | In the pre-burner stronger eddy flow and turbulent flow are arranged, the adherent motion of material, the centre material concentration is rarer, help the steady combustion and the conflagration of fuel: in two main stoves that spurt, rely on to spurt material is distributed in the whole burner hearth, formation is spurted and is distinguished and annulus, strengthens the carrying out of gas-solid mixed heat transfer and reaction.Fuel is lighted in pure air, and the burning of part high temperature brightness flame helps catching fire and after-flame of fuel | 1. main stove material, uniformity of temperature profile.2. main furnace structure is simple, easy and simple to handle.3. local off-line arranges, for " off-line pre-burning ", " online decomposition " 4. precombustion chamber be high-temperature operation.It is better to help in its main stove of 5. pairs of pre-combustion chamber dore furnaces of conflagration of low activity coal dust the material distributing homogeneity, can improve the capacity utilization of dore furnace effectively. |
| Type spurts | 1. 870～920 ℃ of 4. material resolution ratio 85～92% of stove sectional wind velocity 5.5～9.5m/s 2. residence time of material 8～17s 3. operating temperatures | Main dependence is spurted material is distributed in the whole burner hearth, forms spurt district and annulus.Off-line type: fuel burns in pure air.Online: fuel burns in the gaseous mixture of kiln gas and tertiary air. | 1. it is even that material distributes, Temperature Distribution does not have dore furnace of the present invention.2. but off-line or online layout.3. part type of furnace NO xConcentration is lower.4. freely do not cause the material that collapses to stop up to off-line type dore furnace Chang Yinqiang material pulse or tertiary air. |
| Pipeline type | 1. 3. 880～920 ℃ of 4. material resolution ratio 85～90% of operating temperature of stove sectional wind velocity 8～18m/s 2. residence time of material 8～20s when special construction (top adopt be 30s) | This type of furnace is a pipeline stream, and in order to prolong the time of staying of material in pipeline, pipeline need be done very longly. | 1. temperature distribution uniform.2. the material distributing homogeneity is between fluidized bed furnace and other several type of furnaces.3. online or local off-line is arranged.4. be difficult for skinning.5. when burning low-volatile coal, pipeline is longer |
| The fluidization type | 1. expect resolution ratio 60～75% in 820～865 ℃ of 4. stove of stove sectional wind velocity dilute-phase zone 3.5～5.5m/s concentrated phase area 7.5～12m/s 2. residence time of material 45～140s, 3. operating temperatures | Material carries out fluidization with fluidized wind, and tertiary air enters with approximate head-on collision, has dilute-phase zone and concentrated phase area in the stove; This stove is realized reaching 90～95% into " secondary puts in place " of kiln material resolution ratio with vertical gas pass. | 1. material is evenly distributed.2. in the uniformity of temperature profile, stove the temperature difference be everlasting ± 10 ℃ in, can not cause skinning because of hot-spot.3. the stove operation is more stable.4. help the burning of inferior fuel.5. off-line is arranged usually, no high-temperature region, and low-temperature operation, but be unfavorable for fine breeze stop in bed |
| Combined | 1. the stove section variation is bigger, and wind speed changes 860～910 ℃ of 4. material resolution ratio 85～92% of 5～20m/s, 2. residence time of material, 7～18s, 3. operating temperatures greatly | -as divide SB, SC and three chambers of MC. at SB, SC chamber fuel precombustion in pure air, go out to enter the MC chamber behind the SC chamber and further burn, mix and decompose. | 1. two room temperatures distribute difference slightly.It is suitable with the stove that spurts that 2.MC the chamber material distributes, SC chamber thing section skewness, and no dore furnace of the present invention is even.3. local off-line is arranged, is " off-line pre-burning " " online decomposition ".4. sometimes because of the hot-spot skinning.5. belong to part high-temperature operation dore furnace. |
Claims (1)
1, a kind of dore furnace with bispin stream precombustion chamber, it is characterized in that: it mainly constitutes by being connected into a stove group behind two vortex precombustion chambers and the two main stokeholds of spurting, the lower end of two vortex precombustion chambers is connected with oblique flue respectively, and tiltedly the flue lower end is connected the both sides of two main stove belows of spurting; There is the spiral case of air intake, material and coal dust the upper end of each vortex precombustion chamber, and the spiral case sidepiece is the tangent air inlet that connects from the tertiary air of kiln head heat; The into inlet of coal dust is arranged at spiral case top, and tangent air inlet also connects the elephant trunk of pre-thermal material; The spiral case lower end connects the vortex precombustion chamber upper end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02282211 CN2573977Y (en) | 2002-10-16 | 2002-10-16 | Decomposing furnace with double vortex preburning chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02282211 CN2573977Y (en) | 2002-10-16 | 2002-10-16 | Decomposing furnace with double vortex preburning chamber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2573977Y true CN2573977Y (en) | 2003-09-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02282211 Expired - Lifetime CN2573977Y (en) | 2002-10-16 | 2002-10-16 | Decomposing furnace with double vortex preburning chamber |
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| Country | Link |
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| CN (1) | CN2573977Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102080926B (en) * | 2009-11-30 | 2012-10-24 | 华新水泥股份有限公司 | High-efficiency environmentally-friendly predecomposition furnace |
| CN114562875A (en) * | 2022-01-24 | 2022-05-31 | 华新水泥股份有限公司 | Three-spraying double-rotary-cutting gradient combustion low-carbon low-nitrogen environment-friendly decomposing furnace for cement production |
-
2002
- 2002-10-16 CN CN 02282211 patent/CN2573977Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102080926B (en) * | 2009-11-30 | 2012-10-24 | 华新水泥股份有限公司 | High-efficiency environmentally-friendly predecomposition furnace |
| CN114562875A (en) * | 2022-01-24 | 2022-05-31 | 华新水泥股份有限公司 | Three-spraying double-rotary-cutting gradient combustion low-carbon low-nitrogen environment-friendly decomposing furnace for cement production |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: TIANJIN DESIGN INST. OF CEMENT INDUSTRY CO., LTD. Free format text: FORMER OWNER: TIANJIN DESIGN INST. OF CEMENT INDUSTRY Effective date: 20070309 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20070309 Address after: Tianjin District of Beichen city in the 300400 major North Road No. 1 Patentee after: Tianjin Cement Industry Design & Research Institute Co., Ltd. Address before: 300400 Tianjin Beichen Yinhe North Road, No. 1 Patentee before: Tianjin Design Inst. of Cement Industry |
|
| ASS | Succession or assignment of patent right |
Owner name: SINOMA TECHNOLOGY + EQUIPMENT GROUP CO., LTD. Free format text: FORMER OWNER: TIANJIN CEMENT INDUSTRY DESIGN + RESEARCH INSTITUTE CO., LTD. Effective date: 20110916 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20110916 Address after: Tianjin District of Beichen city in the 300400 major North Road No. 1 Patentee after: Sinoma Technology & Equipment Group Co., Ltd. Address before: Tianjin District of Beichen city in the 300400 major North Road No. 1 Patentee before: Tianjin Cement Industry Design & Research Institute Co., Ltd. |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20121016 Granted publication date: 20030917 |