CN105509469A - Low-oxynitride decomposition furnace with precombustion furnace - Google Patents
Low-oxynitride decomposition furnace with precombustion furnace Download PDFInfo
- Publication number
- CN105509469A CN105509469A CN201610012222.4A CN201610012222A CN105509469A CN 105509469 A CN105509469 A CN 105509469A CN 201610012222 A CN201610012222 A CN 201610012222A CN 105509469 A CN105509469 A CN 105509469A
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- furnace
- burner
- cylinder
- flue
- dore furnace
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B17/00—Furnaces of a kind not covered by any preceding group
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
Abstract
The invention discloses a low-oxynitride decomposition furnace with a precombustion furnace, which comprises a precombustion furnace and a decomposition furnace which are connected through a flue, wherein the decomposition furnace comprises an upper column, a middle necking section, a lower column and a bottom cone which are sequentially arranged from top to bottom; the top of the precombustion furnace is provided with a fume outlet connected with the inlet of the flue; the bottom of the precombustion furnace is provided with a coal powder inlet I and a crude material inlet I; the middle part of the lower column is provided with a fume inlet; the outlet of the flue is connected with a fume inlet of the lower column; the bottom cone is provided with a coal powder inlet II; the internal region of the bottom cone and the lower region in the lower column form a reducing region; and the inside of the decomposition furnace forms a fuel burnup region from the middle part of the lower column to the outlet of the decomposition furnace. The low-oxynitride decomposition furnace can lower the oxynitride discharge concentration of the cement clinker production line.
Description
Technical field
The present invention relates to a kind of cement manufacture plant, particularly a kind of low nitrogen oxides decomposition furnace with pre-burner.
Background technology
In China, the Energy Mix of cement industry based on coal ought for the previous period in can not change, the gases such as nitrogen oxide can be discharged in coal burning process, simultaneously because cement industry is in large scale, the nitrogen oxide of cement industry discharge accounts for 10% of discharged nitrous oxides total amount, and improvement situation is very severe.
Dore furnace with pre-burner is China's cement industry application class dore furnace more widely, the disclosed a kind of band precombustion many air intakes denitrogenation-type decomposing furnace of such as patent application 200820185243.7; The disclosed inferior and anthracite dore furnace burning apparatus of patent application 200520094812.3, the dore furnace of the disclosed band double vortex preburning chamber of patent application 02282211.9, the other Combined decomposition furnace putting vortex precombustion chamber of the disclosed band of patent application 99205795.7.The above-mentioned dore furnace with pre-burner can be the pre-burner of eddy flow, also can be suspended state stove, and the number of pre-burner can be one and also can be two.But precombustion chamber is all connected with the main stove of dore furnace, in the main stove of dore furnace, there is no special reproducibility region, reduce the poor effect of discharged nitrous oxides concentration.
The major measure that current China cement production enterprise reduces discharged nitrous oxides selects non-catalytic reduction technology, grading combustion technology, discarded object cooperative disposal, oxygen-enriched combustion technology etc.These methods above-mentioned respectively have deficiency, adopt SNCR technical controlling discharged nitrous oxides, need to consume ammoniacal liquor, directly increase the operating cost of enterprise; Grading combustion technology is general all for the dore furnace of certain type, is not generally suitable for the dore furnace cement producing line with pre-burner; Discarded object cooperative disposal is then subject to the multiple objective factor impact such as policy, local discarded object composition; Oxygen-enriched combustion technology is still in experimental stage, and repeatability is bad.
Summary of the invention
The present invention provides a kind of low nitrogen oxides decomposition furnace with pre-burner for solving in known technology the technical problem that exists, and this dore furnace can reduce the discharged nitrous oxides concentration of cement clinker production line.
The technical scheme that the present invention takes for the technical problem existed in solution known technology is: a kind of low nitrogen oxides decomposition furnace with pre-burner, comprise the pre-burner Sum decomposition stove be connected by flue, described dore furnace comprises the top cylinder set gradually from top to bottom, middle part necking segment, bottom cylinder and bottom centrum, the exhanst gas outlet be connected with flue entrance is provided with at the top of described pre-burner, coal powder entrance I and raw material entrance I is provided with in the bottom of described pre-burner, smoke inlet is provided with at the middle part of described bottom cylinder, the outlet of described flue is connected with the smoke inlet of described bottom cylinder, described bottom centrum is provided with coal powder entrance II, lower area in the interior zone of described bottom centrum and described bottom cylinder forms reproducibility region, start from the middle part of described bottom cylinder in the inside of described dore furnace until the exit of described dore furnace forms fuel after-flame region.
Raw material entrance II is provided with in the bottom of described top cylinder.
Hygrosensor is equipped with in the bottom of described bottom cylinder, on the top of described bottom cylinder and at the middle part of described top cylinder.
The advantage that the present invention has with good effect is: by the dore furnace flue entrance be connected with pre-burner position being risen to the middle part of dore furnace bottom cylinder, and coal powder entrance is added on the centrum of bottom, make fully to contact with a small amount of coal dust of feeding from the flue gas of rotary kiln smoke-box, because oxygen concentration is lower, the middle part of bottom cylinder in dore furnace is made to form reproducibility region below; Because pre-burner brings oxygen into dore furnace, make the middle part of bottom cylinder in dore furnace form fuel after-flame region above, the concentration of emission of rotary kiln nitrogen oxide can be reduced.The present invention adopts fuel staging techniques, be applicable to the transformation of the existing dore furnace with pre-burner, flexibly simple to operate, by controlling the coal dust in each region, the addition of raw material, create a reproducibility region at dore furnace bottom cylinder lower area, can effectively reduce cement plant discharged nitrous oxides.Thus reduce the consumption of ammoniacal liquor, and then reduce operating cost.For the cement clinker production line of the 2500t/d with pre-burner, after adopting the present invention, discharged nitrous oxides concentration declines 10% ~ 50%, for enterprise reduces costs 0.2 ~ 0.8 ten thousand yuan every day, reduces costs 60 ~ 2,400,000 yuan year.In addition, the present invention by adding raw material entrance on dore furnace, part raw material are added on the cylinder of dore furnace top, because the raw material amount absorbing heat within the scope of necking segment in the middle part of pre-burner, flue, dore furnace bottom cylinder Sum decomposition stove reduces, temperature raises, thus improve the burn rate of coal dust, be conducive to the stable of cement plant production.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure: 1, cement rotary kiln, 2, kiln tail smoke-box, 3, bottom centrum, 4, bottom cylinder, 5, top cylinder, 6, pre-burner, 7, flue, 8, coal powder entrance I, 9, coal powder entrance II, 10, raw material entrance I, 11, raw material entrance II, 12, hygrosensor.
Detailed description of the invention
For summary of the invention of the present invention, Characteristic can be understood further, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:
Refer to Fig. 1, a kind of low nitrogen oxides decomposition furnace with pre-burner of the present invention, comprise the pre-burner 6 Sum decomposition stove be connected by flue 7, described dore furnace comprise set gradually from top to bottom top cylinder 5, middle part necking segment, bottom cylinder 4 and bottom centrum 3, the exhanst gas outlet be connected with flue entrance is provided with at the top of described pre-burner 6, coal powder entrance I 8 and raw material entrance I 10 is provided with in the bottom of described pre-burner 6, be provided with smoke inlet at the middle part of described bottom cylinder 4, the outlet of described flue 7 is connected with the smoke inlet of described bottom cylinder 4; Described bottom centrum 3 is provided with coal powder entrance II 9; Lower area in the interior zone of described bottom centrum 3 and described bottom cylinder 4 forms reproducibility region; Start from the middle part of described bottom cylinder 4 in the inside of described dore furnace until the exit of described dore furnace forms fuel after-flame region.
In the present embodiment, raw material entrance II 11 is provided with in the bottom of described top cylinder 5.Raw material all can feed pre-burner 6, also a part can feed pre-burner 6, the top cylinder 5 of another part feeding dore furnace.In order to control the temperature in reproducibility region.Hygrosensor 12 is equipped with in the bottom of described bottom cylinder, on the top of described bottom cylinder and at the middle part of described top cylinder.Above-mentioned pre-burner 6 can be suspended state stove, also can be the pre-burner of the pre-burner of eddy flow or other types.
Operation principle of the present invention:
When the present invention applies in cement clinker production line, the bottom of pre-burner 6 is connected with the kiln hood tertiary-air pipe of cement rotary kiln 1, and the bottom of dore furnace is connected with the kiln tail smoke-box 2 of cement rotary kiln 1.
Cement slurry is after grinding, preheating, a part is entered in pre-burner 6 by raw material entrance I 10 decomposes, coal dust is entered in pre-burner by coal powder entrance I 8 and carries out combustion heat release, tertiary air from kiln head of rotary cement kiln enters pre-burner 6 and makes coal dust firing, and the flue gas in pre-burner 6 carries unburnt coal dust and undecomposed raw meal powder completely enters the middle part of dore furnace bottom cylinder 4 by pipeline 7.
Flue gas from cement rotary kiln tail smoke-box 2 enters bottom cylinder 4 by the bottom centrum 3 of dore furnace, and a part of coal dust feeds bottom centrum 3 from coal powder entrance II 9.This part coal dust forms reproducibility region with the smoke contacts from cement rotary kiln tail smoke-box, greatly can reduce the nitrous oxides concentration in cement rotary kiln kiln exit gas.
Start until the exit of dore furnace is the fuel after-flame region of dore furnace at the middle part of selfdecomposition stove bottom, the inside cylinder 4 of dore furnace.Flue gas from pre-burner 6 mixes in this region with the flue gas through reproducibility region.Because pre-burner 6 has brought oxygen into, make the coefficient of excess air in this region reach 1.1 ~ 1.2, because oxygen concentration improves, make unburnt coal dust through reproducibility region and carbon monoxide at this zonal combustion after-flame, raw material are endothermic decomposition then.A part of raw material are fed pre-burner, and another part raw material feeding dore furnace top cylinder 4, can be used to the temperature regulating dore furnace.
Although be described the preferred embodiments of the present invention by reference to the accompanying drawings above; but the present invention is not limited to above-mentioned detailed description of the invention; above-mentioned detailed description of the invention is only schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, can also make a lot of form, these all belong within protection scope of the present invention.
Claims (3)
1. the low nitrogen oxides decomposition furnace with pre-burner, comprise the pre-burner Sum decomposition stove be connected by flue, described dore furnace comprise set gradually from top to bottom top cylinder, middle part necking segment, bottom cylinder and bottom centrum, the exhanst gas outlet be connected with flue entrance is provided with at the top of described pre-burner, coal powder entrance I and raw material entrance I is provided with in the bottom of described pre-burner, it is characterized in that
Be provided with smoke inlet at the middle part of described bottom cylinder, the outlet of described flue is connected with the smoke inlet of described bottom cylinder; Described bottom centrum is provided with coal powder entrance II; Lower area in the interior zone of described bottom centrum and described bottom cylinder forms reproducibility region; Start from the middle part of described bottom cylinder in the inside of described dore furnace until the exit of described dore furnace forms fuel after-flame region.
2. the low nitrogen oxides decomposition furnace with pre-burner according to claim 1, is characterized in that, is provided with raw material entrance II in the bottom of described top cylinder.
3. the low nitrogen oxides decomposition furnace with pre-burner according to claim 1, is characterized in that, is equipped with hygrosensor in the bottom of described bottom cylinder, on the top of described bottom cylinder and at the middle part of described top cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610012222.4A CN105509469A (en) | 2016-01-04 | 2016-01-04 | Low-oxynitride decomposition furnace with precombustion furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610012222.4A CN105509469A (en) | 2016-01-04 | 2016-01-04 | Low-oxynitride decomposition furnace with precombustion furnace |
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| CN105509469A true CN105509469A (en) | 2016-04-20 |
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| CN201610012222.4A Pending CN105509469A (en) | 2016-01-04 | 2016-01-04 | Low-oxynitride decomposition furnace with precombustion furnace |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111750672A (en) * | 2020-07-07 | 2020-10-09 | 天津水泥工业设计研究院有限公司 | Gradient combustion self-denitration system with external combustion chamber for decomposing furnace |
| CN112594697A (en) * | 2020-12-28 | 2021-04-02 | 华润水泥技术研发（广西）有限公司 | External expansion and nitrogen reduction combined decomposition furnace |
| CN115325529A (en) * | 2022-10-13 | 2022-11-11 | 邢台金隅咏宁水泥有限公司 | Denitration device |
| CN116947344A (en) * | 2023-07-28 | 2023-10-27 | 成都建筑材料工业设计研究院有限公司 | Cement production system and method with adjustable ratio of alternative fuel to fossil fuel |
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| CN2365622Y (en) * | 1999-03-04 | 2000-02-23 | 国家建筑材料工业局天津水泥工业设计研究院 | Combined decomposition furnace with side swirl precombustion chamber |
| EP1310467A2 (en) * | 2001-11-10 | 2003-05-14 | KHD Humboldt Wedag AG | Method and apparatus for the introduction of solid dusting fuel in the calciner of a cement clinker production line |
| CN201250187Y (en) * | 2008-08-27 | 2009-06-03 | 南京凯盛水泥技术工程有限公司 | Multi-air-intake denitrogenation-type decomposing furnace with prechamber |
| CN102636026A (en) * | 2012-03-27 | 2012-08-15 | 安徽海螺川崎装备制造有限公司 | Environment-friendly type C-KSV decomposition furnace |
| CN202770241U (en) * | 2012-09-25 | 2013-03-06 | 徐吉富 | Spiral-flow type cement decomposing furnace |
| CN104713360A (en) * | 2015-03-17 | 2015-06-17 | 武汉理工大学 | Decomposing furnace based on stepped combustion and emission reduction NOx technology and control method thereof |
| CN205482347U (en) * | 2016-01-04 | 2016-08-17 | 天津中材工程研究中心有限公司 | Low nitrogen oxide dore furnace with furnace in advance |
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2016
- 2016-01-04 CN CN201610012222.4A patent/CN105509469A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2365622Y (en) * | 1999-03-04 | 2000-02-23 | 国家建筑材料工业局天津水泥工业设计研究院 | Combined decomposition furnace with side swirl precombustion chamber |
| EP1310467A2 (en) * | 2001-11-10 | 2003-05-14 | KHD Humboldt Wedag AG | Method and apparatus for the introduction of solid dusting fuel in the calciner of a cement clinker production line |
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| CN102636026A (en) * | 2012-03-27 | 2012-08-15 | 安徽海螺川崎装备制造有限公司 | Environment-friendly type C-KSV decomposition furnace |
| CN202770241U (en) * | 2012-09-25 | 2013-03-06 | 徐吉富 | Spiral-flow type cement decomposing furnace |
| CN104713360A (en) * | 2015-03-17 | 2015-06-17 | 武汉理工大学 | Decomposing furnace based on stepped combustion and emission reduction NOx technology and control method thereof |
| CN205482347U (en) * | 2016-01-04 | 2016-08-17 | 天津中材工程研究中心有限公司 | Low nitrogen oxide dore furnace with furnace in advance |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111750672A (en) * | 2020-07-07 | 2020-10-09 | 天津水泥工业设计研究院有限公司 | Gradient combustion self-denitration system with external combustion chamber for decomposing furnace |
| CN112594697A (en) * | 2020-12-28 | 2021-04-02 | 华润水泥技术研发（广西）有限公司 | External expansion and nitrogen reduction combined decomposition furnace |
| CN112594697B (en) * | 2020-12-28 | 2023-08-08 | 华润水泥技术研发（广西）有限公司 | Combined decomposing furnace with external capacity expansion and nitrogen reduction functions and use method thereof |
| CN115325529A (en) * | 2022-10-13 | 2022-11-11 | 邢台金隅咏宁水泥有限公司 | Denitration device |
| CN116947344A (en) * | 2023-07-28 | 2023-10-27 | 成都建筑材料工业设计研究院有限公司 | Cement production system and method with adjustable ratio of alternative fuel to fossil fuel |
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Application publication date: 20160420 |