CN107842849A - A kind of low NO of cement decomposing furnace coal dust pre-vaporizedXCombustion system and method - Google Patents
A kind of low NO of cement decomposing furnace coal dust pre-vaporizedXCombustion system and method Download PDFInfo
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- CN107842849A CN107842849A CN201711039993.3A CN201711039993A CN107842849A CN 107842849 A CN107842849 A CN 107842849A CN 201711039993 A CN201711039993 A CN 201711039993A CN 107842849 A CN107842849 A CN 107842849A
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- coal
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- stove
- furnace
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- 239000002817 coal dust Substances 0.000 title claims abstract description 87
- 239000004568 cement Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000003245 coal Substances 0.000 claims abstract description 54
- 238000002485 combustion reaction Methods 0.000 claims abstract description 32
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000004744 fabric Substances 0.000 claims abstract description 10
- 239000007921 spray Substances 0.000 claims abstract description 10
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 9
- 239000002002 slurry Substances 0.000 claims abstract description 9
- 239000003034 coal gas Substances 0.000 claims description 13
- 239000000446 fuel Substances 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 8
- 239000003546 flue gas Substances 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 238000000354 decomposition reaction Methods 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 4
- 238000007084 catalytic combustion reaction Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 33
- 238000002309 gasification Methods 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 210000004894 snout Anatomy 0.000 description 2
- 241000143973 Libytheinae Species 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/54—Gasification of granular or pulverulent fuels by the Winkler technique, i.e. by fluidisation
- C10J3/56—Apparatus; Plants
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
Abstract
The invention discloses it is an object of the invention to provide a kind of cement decomposing furnace coal dust pre-vaporized low NOx combustion system and method, it can stablize and burn and can effectively reduce NOx emission, while improve the efficiency of combustion of dore furnace.Including：Coal feeder, coal dust pre-vaporized stove, cloth wind system and dore furnace；The cloth wind system includes coal dust jet pipe, primary air piping and tertiary-air pipe, and the coal feeder includes coal bunker and coal pulverizer, and the coal pulverizer is connected by the coal dust jet pipe with the lower end of the coal dust pre-vaporized stove；The upper end of the coal dust pre-vaporized stove is connected by the primary air piping with the reducing zone of the dore furnace；The tertiary-air pipe is three-port structure, and its one end connects with the grate-cooler of outside, and its two other branch end connects with the middle part of the coal dust pre-vaporized stove and the burning-out zone of the dore furnace respectively；Cement slurry spout is provided with the top of the burning-out zone, spray ammonia pipe is provided with the top of the dore furnace.
Description
Technical field
The invention belongs to low NOx combusting technology field, and in particular to a kind of cement decomposing furnace coal dust pre-vaporized low NOx combustion
System and method.
Background technology
Cement kiln is typical maximum discharge Industrial Stoves, the especially discharge of nitrogen oxides, and according to statistics, often 1 ton of production is ripe
Material about produces 1.5kg~1.8kg NOx, and cement industry accounts for the 10% of China's nitrogen oxides total release.With China's economy
Fast development, the demand of cement is still occupied it is high do not subtract, cause discharged nitrous oxides to be continuously increased, and country is to cement industry
The discharge standard of nitrogen oxides is more and more stricter.Promulgated in country in 2013《Cement industry atmosphere pollutants emission standardses》
In, it is specified that discharged nitrous oxides are no more than 400mg/m3, key area must not exceed 320mg/m3.With people's environmental consciousness
Improve, the cry more and more higher to reducing cement industry discharged nitrous oxides, the research of cement industry low nitrogen burning is very urgent.
At present, cement industry, will generally using the discharged nitrous oxides of grading combustion technology control dore furnace combustion process
Air point two-stage required for fuel combustion enters, and the excess air coefficient of primary combustion zone is relatively low in stove, forms reducing zone,
On the basis of suppressing fuel type NOx generations, substantial amounts of thermal NO x in kiln exit gas can be reduced to N2.Due to air classification
Into coal dust and raw material need to be changed to multi-point multi-layer feeding accordingly, not only need to set up multiple points of wind in operation, divide coal
Deng hardware facility, it is also necessary to around burn till main line in strict accordance with as defined in actual production line technological parameter carry out total system it is fine
Change operation, extensive operator scheme can not effectively reduce the discharge of nitrogen oxides, only be difficult to completely by the technology, NOx CER
Sufficient discharging standards requirement.
The content of the invention
, can it is an object of the invention to provide a kind of cement decomposing furnace coal dust pre-vaporized low NOx combustion system and method
It is stable to burn and effectively reduce NOx emission, while improve the efficiency of combustion of dore furnace.
In order to achieve the above object, concrete technical scheme of the invention is as follows：
A kind of cement decomposing furnace coal dust pre-vaporized low NOx combustion system, including：Coal feeder, coal dust pre-vaporized stove, cloth wind
System and dore furnace；The cloth wind system includes coal dust jet pipe, primary air piping and tertiary-air pipe,
The coal feeder includes coal bunker and coal pulverizer, and the discharge end of the coal pulverizer connected with the coal bunker passes through institute
The lower end that coal dust jet pipe is stated with the coal dust pre-vaporized stove connects；The upper end of the coal dust pre-vaporized stove passes through the primary air piping
It is communicated to the reducing zone of the dore furnace；The tertiary-air pipe is three-port structure, and its one end connects with the grate-cooler of outside, and its is another
Wherein one of Wai Liangge branches connects with the coal dust pre-vaporized stove, its another burning-out zone for being communicated to the dore furnace；
Cement slurry spout is provided with the decomposition furnace sidewall of the top of the burning-out zone, on the top of the dore furnace
Portion is provided with spray ammonia pipe.
Present invention also offers utilize a kind of cement decomposing furnace coal dust pre-vaporized low NOx combustion system described in claim 1
The method that system carries out coal dust pre-vaporized, comprises the following steps：
A. raw coal is sent into coal bunker and wears into coal dust into coal pulverizer, and institute is sprayed onto by the coal dust jet pipe by wind of delivering coal
State in coal dust pre-vaporized stove；
B. the coal dust carries out part burning in the coal dust pre-vaporized stove, discharges heat, while by the tertiary air
Pipe be sent into come from grate-cooler high temperature tertiary air provide heat, maintain the coal dust pre-vaporized in-furnace temperature 800 DEG C~
Between 900 DEG C, coal dust pre-vaporized is realized；
C. described in the coal gas after pre-vaporized and semicoke mixture being sprayed into by fuel nozzle by the primary air piping
In dore furnace, and the oxygen catalytic combustion in high-temperature flue gas, the water that the combustion heat of release will enter from the cement slurry spout
Mud raw material decompose.
Further, in step c, the coal gas includes CO, H2。
Reducing gas CO, H in the coal gas2、CH4Contacted with high-temperature flue gas, reduce nitrogen oxides therein；Described three
Secondary airduct is sent into high temperature tertiary air into the dore furnace to provide the oxygen needed for burning, the spray ammonia pipe in the dore furnace
The further nitrogen oxides reduction of ammonia sprayed into the dore furnace, reduce NOx emission.
A kind of cement decomposing furnace coal dust pre-vaporized low NOx combustion system provided by the invention and method, by coal dust pre-vaporized
Stove is combined with dore furnace, and coal dust is first gasified and burnt again, avoid coal dust directly burn, fuel type NOx generation, and high-temperature coal
Gas and high-temperature oxygen carry out flameless combustion once contacting immediately, and temperature is uniform, it is suppressed that thermal NO x generation, gasifies simultaneously
Reducing gas CO, H in coal gas afterwards2、 CH4The nitrogen oxides in high-temperature flue gas can be reduced, further reduces NOx emission,
Realize formation control and reduction decomposition of the whole combustion process to NOx.In addition, after coal dust pre-vaporized temperature reach 800 DEG C with
On, stablize burning immediately entering reducing zone, improve the efficiency of combustion of dore furnace.
Brief description of the drawings
Fig. 1 provides cement decomposing furnace coal dust pre-vaporized low NOx combustion system figure for the present invention；
Fig. 2 is dore furnace burning-out zone sectional top view；
1. coal bunker, 2. coal pulverizers, 3. coal dust jet pipes, 4. coal dust pre-vaporized stoves, 5. fuel nozzles, 6. dore furnaces, 7. three times
Airduct, 8. tertiary air nozzles, 9. spray ammonia pipes, 10. primary air pipings, 11. cement slurry spouts.
Embodiment
Embodiments of the present invention are illustrated below in conjunction with the accompanying drawings.
A kind of cement decomposing furnace coal dust pre-vaporized low NOx combustion system, including：Coal feeder, coal dust pre-vaporized stove 4, cloth
Wind system and dore furnace 6；The cloth wind system includes coal dust jet pipe 3, primary air piping 10 and tertiary-air pipe 7,
The coal feeder includes coal bunker 1 and coal pulverizer 2, the discharge end of the coal pulverizer 2 connected with the coal bunker 1
Connected by the coal dust jet pipe 3 with the lower end of the coal dust pre-vaporized stove 4；The upper end of the coal dust pre-vaporized stove 4 passes through institute
State the reducing zone that primary air piping 10 is communicated to the dore furnace 6；The tertiary-air pipe 7 is three-port structure, its one end and outside
Grate-cooler connects, and wherein one of its two other branch connects with the coal dust pre-vaporized stove 4, its another be communicated to described in
The burning-out zone of dore furnace 6；
Cement slurry spout 11 is provided with the side wall of the dore furnace 6 of the top of the burning-out zone, in the dore furnace 6
Top be provided with spray ammonia pipe 9.
Coal dust pre-vaporized stove 4 therein is improved by existing coal powder pre-burning room, and its agent structure and coal dust are pre-
It is identical to fire room, meanwhile, the tertiary-air pipe 7 being connected with grate-cooler is added, improves the temperature of conventional coal powder pre-burning room, Jin Erbao
Between card furnace temperature maintains 800 DEG C~900 DEG C, partial gasification of the coal dust in this temperature range is realized.
The primary air piping 10 and tertiary-air pipe 7 being passed through in the dore furnace 6 are three-port structure, can be preferably comprehensive
The feed oxygen into dore furnace 6.
This programme is delivered to dore furnace 6 and burnt again by the way that Pulverized Coal is gasified in advance, avoid coal dust directly burn, fuel
Type NOx generation, and coal dust carries out part burning in pre-vaporized stove, discharges heat, furnace temperature is maintained into 800 DEG C~900 DEG C
Between, partial gasification can be achieved in coal dust in this temperature range, becomes coal gas after coal dust partial gasification and the mixture of semicoke enters
Enter dore furnace 6 to burn, directly burnt the oxidation of volatile matter nitrogen, and coal gas of high temperature and the sky in high-temperature flue gas due to avoiding coal dust
Gas carries out flameless combustion immediately in reducing zone once contact, and temperature is uniform, so as to inhibit the life of nitrogen oxides to a certain extent
Into.Further as CO, H in coal gas2With reproducibility, can also reduce caused in high-temperature flue gas and dore furnace 6
Nitrogen oxides, realize formation control and reduction decomposition of the overall process to NOx.
The method that coal dust pre-vaporized is carried out using described cement decomposing furnace coal dust pre-vaporized low NOx combustion system：
Raw coal enters coal pulverizer 2 from coal bunker 1, and raw coal is worn into coal dust by coal pulverizer 2, and by delivering coal, wind is sprayed by coal dust jet pipe 3
Into coal dust pre-vaporized stove 4.Coal dust carries out part combustion heat release amount, while high temperature tertiary air in coal dust pre-vaporized stove 4
Partial heat is provided, between furnace temperature is maintained into 800 DEG C~900 DEG C, realizes coal dust pre-vaporized.The CO that is obtained by pre-vaporized,
CH4、H2Coal gas and semicoke mixture Deng mixture are sprayed into dore furnace 6 by primary air piping 10, with the oxygen in high-temperature flue gas
Catalytic combustion, the combustion heat is discharged, to decompose the cement slurry for entering dore furnace 6 from cement slurry feed opening 11.In the middle part of coal gas
Divide reducing gas to be in contact with high-temperature flue gas, reduce nitrogen oxides therein.High temperature tertiary air from grate-cooler passes through three times
Two wind snouts three times 8 being oppositely arranged that airduct 7 delivers to burning-out zone spray into dore furnace 6 respectively, for ensureing that pre-heating fuel is complete
Full burning.Spray ammonia pipe 9 is provided with the topmost of dore furnace 6, appropriate ammonia can be sprayed into, further nitrogen oxides reduction, reduce NOx
Discharge.
Fig. 1 and Fig. 2 is respectively that cement decomposing furnace coal dust pre-vaporized low NOx combustion system figure and dore furnace burning-out zone section are bowed
View.
The dore furnace coal dust pre-vaporized low NOx combustion system includes coal feeder, gasification installation, cloth wind system and decomposition
Stove.Coal feeder is coal bunker 1 and coal pulverizer 2, for supplying coal dust to whole combustion system.Gasification installation is the pre- gas of a fluid bed
Change stove 4, coal dust carries out part burning wherein, and bed temperature is stable between 800 DEG C~900 DEG C, make coal dust pre-vaporized into CO,
CH4、H2Deng coal gas of high temperature and semicoke mixture.Cloth wind system includes coal dust jet pipe 3, primary air piping 10 and tertiary-air pipe 7.
Wind of being delivered coal in coal dust jet pipe 3 carries in the coal dust penetrating pre-vaporized stove 4 that coal pulverizer 2 supplies and carries out pre-vaporized；Once
Airduct 10 is located between pre-vaporized stove 4 and dore furnace 6, the fuel obtained after pre-vaporized is sprayed into dore furnace reducing zone, it is distinguished
Dore furnace 6 is sprayed into respectively from two fuel nozzles being oppositely arranged 5.High temperature tertiary air from grate-cooler is divided into two strands, and first
Stock is delivered to dore furnace burning-out zone by tertiary-air pipe 7, and for providing the oxygen amount needed for fuel after-flame, it is relative from two respectively
Wind snout 8 sprays into dore furnace respectively three times for setting, so as to increase gas stream in the stove degree of mixing, improves efficiency of combustion；Second strand passes through
Tertiary-air pipe 7 is delivered in pre-vaporized stove, and for supplementing the air capacity and heat needed for coal dust pre-vaporized, two strands of tertiary airs can root
Flow proportional is adjusted according to actual conditions.
Embodiment：
The combustion system is used on 3200t/d cement kiln.Coal pulverizer supplies coal dust by 3.32kg/sec speed,
By delivering coal, wind sprays into gasification furnace, and wind mass flow of delivering coal is 1.4kg/sec, accounts for the 5% of system required air quantity.Remaining 95% is
High temperature tertiary air, high temperature tertiary air are divided into two strands, and one is sent into gasification furnace, and for used in coal dust gasification, its mass flow is
4.45kg/sec, account for the 17% of tertiary air total amount；In another strand of feeding dore furnace, giving gas, it is used to burn away, its quality stream
Measure as 22.23kg/sec, account for the 83% of tertiary air total amount.
Decomposition furnace outlet gas component is as follows：
| Component | H2 | O2 | N2 | CO | CO2 | SO2 | H2O |
| Percentage (%) | 0.03 | 2.76 | 62.68 | 0.37 | 28.95 | 0.03 | 4.98 |
Dore furnace combustion system is directly entered compared to coal dust, the system can reduce NOx generations 60%-70%.
More than, although the description of several embodiments of the invention, but these embodiments are intended only as example proposition
, it is not intended to limit the scope of the present invention.For these new embodiments, can be implemented in a manner of other are various,
In the range of idea of the invention is not departed from, various omissions, displacement and change can be carried out.These embodiments and its change
Shape, the invention being also contained in described in claims while being contained in scope and spirit of the present invention and its impartial model
In enclosing.
Claims (3)
- A kind of 1. cement decomposing furnace coal dust pre-vaporized low NOx combustion system, it is characterised in that including：The pre- gas of coal feeder, coal dust Change stove, cloth wind system and dore furnace；The cloth wind system includes coal dust jet pipe, primary air piping and tertiary-air pipe,The coal feeder includes coal bunker and coal pulverizer, and the discharge end of the coal pulverizer connected with the coal bunker passes through the coal Powder jet pipe connects with the lower end of the coal dust pre-vaporized stove；The upper end of the coal dust pre-vaporized stove is connected by the primary air piping To the reducing zone of the dore furnace；The tertiary-air pipe is three-port structure, and its one end connects with the grate-cooler of outside, and its other two Wherein one of individual branch connects with the coal dust pre-vaporized stove, its another burning-out zone for being communicated to the dore furnace；Cement slurry spout is provided with the decomposition furnace sidewall of the top of the burning-out zone, is set at the top of the dore furnace There is spray ammonia pipe.
- 2. carry out coal dust pre-vaporized using a kind of cement decomposing furnace coal dust pre-vaporized low NOx combustion system described in claim 1 Method, it is characterised in that comprise the following steps：A. raw coal is sent into coal bunker and wears into coal dust into coal pulverizer, and the coal is sprayed onto by the coal dust jet pipe by wind of delivering coal In powder pre-vaporized stove；B. the coal dust carries out part burning in the coal dust pre-vaporized stove, discharges heat, while sent by the tertiary-air pipe The high temperature tertiary air for coming from grate-cooler entered provides heat, maintains the coal dust pre-vaporized in-furnace temperature at 800 DEG C~900 DEG C Between, realize coal dust pre-vaporized；C. the coal gas after pre-vaporized and semicoke mixture are sprayed into the decomposition by the primary air piping by fuel nozzle In stove, with the oxygen catalytic combustion in high-temperature flue gas, the combustion heat of release gives birth to the cement entered from the cement slurry spout Material decomposes.
- 3. a kind of cement decomposing furnace coal dust pre-vaporized low NOx combustion system according to claim 2 carries out coal dust pre-vaporized Method, it is characterised in that in step c, the coal gas includes CO, CH4、H2。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711039993.3A CN107842849A (en) | 2017-10-31 | 2017-10-31 | A kind of low NO of cement decomposing furnace coal dust pre-vaporizedXCombustion system and method |
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| CN201711039993.3A CN107842849A (en) | 2017-10-31 | 2017-10-31 | A kind of low NO of cement decomposing furnace coal dust pre-vaporizedXCombustion system and method |
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| CN109111136A (en) * | 2018-10-11 | 2019-01-01 | 北京汉能清源科技有限公司 | Cement kiln low-grade coal highly effective combustion system and method |
| CN109539245A (en) * | 2018-10-30 | 2019-03-29 | 西安交通大学 | A kind of pulverized coal preheating solution decoupling combustion device |
| CN110360843A (en) * | 2019-07-31 | 2019-10-22 | 中国科学院力学研究所 | A kind of cement decomposing furnace coal dust high-efficiency gasification low-NO_x combustion technology device |
| CN111960698A (en) * | 2019-08-20 | 2020-11-20 | 中国科学院工程热物理研究所 | Fuel supply system and method for industrial kiln equipment and industrial kiln equipment |
| CN113124410A (en) * | 2019-12-31 | 2021-07-16 | 浙江千尧环境工程有限公司 | Combustion device with low nitrogen oxide emission |
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| CN111960698A (en) * | 2019-08-20 | 2020-11-20 | 中国科学院工程热物理研究所 | Fuel supply system and method for industrial kiln equipment and industrial kiln equipment |
| CN112408823A (en) * | 2019-08-20 | 2021-02-26 | 中国科学院工程热物理研究所 | Fuel supply system and method for industrial kiln equipment and industrial kiln equipment |
| CN113124410A (en) * | 2019-12-31 | 2021-07-16 | 浙江千尧环境工程有限公司 | Combustion device with low nitrogen oxide emission |
| CN113124410B (en) * | 2019-12-31 | 2023-03-07 | 浙江千尧环境工程有限公司 | Combustion device with low nitrogen oxide emission |
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