CN110006030A - A kind of efficient after-flame of pulverized coal preheating solution and low nitrogen reduction apparatus and method - Google Patents
A kind of efficient after-flame of pulverized coal preheating solution and low nitrogen reduction apparatus and method Download PDFInfo
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- CN110006030A CN110006030A CN201910208800.5A CN201910208800A CN110006030A CN 110006030 A CN110006030 A CN 110006030A CN 201910208800 A CN201910208800 A CN 201910208800A CN 110006030 A CN110006030 A CN 110006030A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
- F23B80/00—Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel
- F23B80/02—Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel by means for returning flue gases to the combustion chamber or to the combustion zone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
- F23B90/00—Combustion methods not related to a particular type of apparatus
- F23B90/04—Combustion methods not related to a particular type of apparatus including secondary combustion
- F23B90/06—Combustion methods not related to a particular type of apparatus including secondary combustion the primary combustion being a gasification or pyrolysis in a reductive atmosphere
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- 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
- F23C1/00—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air
- F23C1/12—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air gaseous and pulverulent fuel
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- 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
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/06—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for completing combustion
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Abstract
A kind of efficient after-flame of pulverized coal preheating solution of the invention and low nitrogen reduction apparatus and method achieve the purpose that pyrolysis gas and coke separate by being rotatably pyrolyzed plate, and structure is simple, and separative efficiency is high.Described device, including boiler are pyrolyzed cylinder, rotate coaxially the pyrolysis plate being arranged in pyrolysis cylinder, and be arranged in pyrolysis cylinder top to powder device；The pyrolysis plate is horizontally disposed, and intermittent around central axis overturning；Pyrolysis cylinder is divided into pre- pyrolysis chamber and the coke chamber of lower part on top by pyrolysis plate；The front end of pre- pyrolysis chamber is provided with for providing the mixing chamber of pyrolysis atmosphere, rear end connection setting pyrolysis gas jets；Primary air piping, rear end connection setting coke nozzle is arranged in the front end of coke chamber；The reducing zone setting pyrolysis gas jets of the boiler furnace, burning-out zone setting control nozzle, coke nozzle is arranged in primary zone；Input terminal of the furnace outlet flue gas through flue gas recirculation piping connection mixing chamber, the input terminal of mixing chamber are additionally provided with center primary air duct and gas pipeline.
Description
Technical field
The invention belongs to the burners of Thermal Energy and Power Engineering technical field, are related to clean energy using device, specifically
For a kind of efficient after-flame of pulverized coal preheating solution and low nitrogen reduction apparatus and method.
Background technique
The energy pattern of China's few gas rich in coal and poor in oil determines energy utilization situation of the China based on coal, and China is one again
A industrial power, the industries such as electric power, steel, metallurgy are all based on fire coal, and the nitrogen oxides that coal burning generates can bring light
The environmental issues such as chemical fumes, control discharged nitrous oxides have become the matter of great urgency, it would be highly desirable to develop the low efficient coal dust combustion of nitrogen
Burn device.
Patent [101761920 B of CN] is by being introduced directly into pyrolysis reactor for the high-temperature flue gas of furnace outlet as pyrolysis
Process provides pyrolysis heat source, which has the following problems: when boiler load is lower, furnace outlet gas temperature is not enough to provide heat
When solving institute's calorific requirement, then without other heat sources as supplement；When using the coals such as the lower anthracite of volatile matter, pyrolytic reaction
When device can not provide enough pyrolysis gas reduction nitrogen oxides that primary zone generates, also without other reducibility gas as benefit
It fills, it is higher to eventually lead to formation of nitrogen oxides.The invention can not adjust pyrolysis temperature according to the variation of operating load and coal
Degree, flexibility are poor.
Patent [103697469 A of CN] realizes pyrolysis and burning directly by fuel gas buring as pyrolysis heat source substantially
The decoupling of process, compared with patent [101761920 B of CN], pyrolysis temperature is not by factors such as boiler operatiopn load and coals
Limitation, improves flexibility, but gas price is expensive, if pyrolytic process institute calorific requirement fully relies on fuel gas buring to provide,
Operating cost certainly will be significantly increased.
Be mainly in process of coal combustion volatile matter and fixed carbon in action, and volatile matter can be with warm in pyrolytic process
The form vented one's spleen releases, and using fuel type NOx as main component when coal dust firing, and pyrolysis gas can be in pyrolytic process by one
Part nitrogen is with HCN and NH3Form take out of, the stronger pyrolysis gas of reproducibility is secondly sent into reducing zone for part NOx also
Originally it is N2, the generation of fuel type NOx can be significantly reduced.Conventional pyrolytic device is all by cyclone separator by pyrolysis gas and coke
Charcoal separation, structure is complicated.
Summary of the invention
Aiming at the problems existing in the prior art, the present invention provides a kind of efficient after-flame of pulverized coal preheating solution and low nitrogen is also original-pack
It sets and method, achievees the purpose that pyrolysis gas and coke separate by being rotatably pyrolyzed plate, structure is simple, and separative efficiency is high.
The present invention is to be achieved through the following technical solutions:
A kind of efficient after-flame of pulverized coal preheating solution and low nitrogen reduction apparatus, including boiler are pyrolyzed cylinder, rotate coaxially and are arranged in heat
Solve the pyrolysis plate in cylinder, and be arranged in pyrolysis cylinder top to powder device；
The pyrolysis plate is horizontally disposed, and intermittent around central axis overturning；Pyrolysis plate is divided into top for cylinder is pyrolyzed
The coke chamber of pre- pyrolysis chamber and lower part；The front end of pre- pyrolysis chamber is provided with for providing the mixing chamber of pyrolysis atmosphere, rear end connection
Setting pyrolysis gas jets；Primary air piping, rear end connection setting coke nozzle is arranged in the front end of coke chamber；
The reducing zone setting pyrolysis gas jets of the boiler furnace, burning-out zone setting control nozzle, coke is arranged in primary zone
Nozzle；Input terminal of the furnace outlet flue gas through flue gas recirculation piping connection mixing chamber, during the input terminal of mixing chamber is additionally provided with
Heart primary air duct and gas pipeline.
Preferably, it is described to powder device include the coal scuttle set gradually, pulverizer coal feeder, to powder pipeline and dial coal machine, dial coal
Machine is arranged close to the side of mixed air vessel.
Further, the pulverizer coal feeder is provided with feed back control system, and feed back control system is for real-time reception coal warm
Solve characteristic, furnace outlet amount of nitrogen oxides and operating load parameter, and according to the parameter received calculate Limestone control to
Powder machine.
Preferably, the plate-like setting of pyrolysis plate, is made of corundum；Pyrolysis board ends are equipped with bearing, and with
Driving device connection outside pyrolysis cylinder is set.
Preferably, sealing tooth is provided at the end of the pyrolysis plate and pyrolysis cylinder inner wall；Coke chamber and pre- pyrolysis chamber are equal
Equipped with pressure sensor, pre- pyrolysis chamber pressure is 70-90Pa higher than the pressure of coke chamber.
Preferably, it is equipped with thermocouple the real time measure pyrolysis gas temperature in the outlet of pre- pyrolysis chamber, temperature is lower than given threshold
When, it is passed through natural gas.
Preferably, the every face furnace wall of boiler furnace is disposed with air nozzle, pyrolysis gas jets and coke nozzle from top to bottom；
The same layer of pyrolysis gas jets or coke nozzle is uniformly distributed on peripheries with two groups of nozzles, is opposed firing coal-powder boiler, and opposite nozzle is
One group, two groups of nozzles are separately connected the pre- pyrolysis chamber of two pyrolysis cylinders and alternately put into operation, for continuously supplying or to powder.
Preferably, the center primary air duct of mixing chamber input terminal, gas pipeline and flue gas recirculation pipeline successively by
It is coaxially arranged from inside to outside；The first valve is arranged in center primary air duct and natural gas tube road, and the second valve is arranged on primary air piping
, third valve is set on flue gas recirculation pipeline, connects the 4th valve of setting on the after-flame air pipe line of air nozzle.
A kind of efficient after-flame of pulverized coal preheating solution and low nitrogen restoring method, based on device described in above-mentioned any one,
The part high-temperature flue gas of furnace outlet, which is sent into pre- pyrolysis chamber from flue gas recirculation pipeline, makes pulverized coal pyrolysis, pyrolysis knot
Pyrolysis gas after beam is sent into the reducing zone of burner hearth by pyrolysis gas jets, and the NOx that primary zone generates is reduced into N2, then from sky
Gas jets are sent into air in burning-out zone for imperfect combustion pyrolysis gas and coal dust firing；
Meanwhile positioned at the pyrolysis plate of pre- pyrolysis chamber center around 180 ° of center axis rotation, pyrogenous origin coke is in weight
The lower pyrolysis plate that is detached from of power effect falls into coke chamber, and pyrolysis gas is separated with coke, then carries pyrolysis by the air that primary air piping is sent into
The coke of generation is sent into burner hearth primary zone from coke nozzle.
Preferably, when because of coal type change, pyrolysis gas underproduces to restore the nitrogen oxides generated and lead to furnace outlet nitrogen
When oxide is higher, natural gas is sent by gas pipeline and adjusts reduction effect；
At low load when flue-gas temperature is relatively low is not enough to provide pyrolysis institute's calorific requirement, day is increased by gas pipeline
Right gas conveying capacity and center primary air piping primary air flow increase pre- pyrolysis Indoor Thermal amount release.
Compared with prior art, the invention has the following beneficial technical effects:
Device of the present invention realizes the separation of pyrolysis gas and coke by the intermittent rotation of pyrolysis plate, to be pyrolyzed in advance
After indoor pyrolysis gas is pulled away, coke is brought into the coke chamber of lower section, improves separative efficiency by pyrolysis plate rotation；It is pyrolyzed plate
Two sides can carry out pulverized coal pyrolysis, shorten interval time；Simultaneously by having in the pre- indoor investment natural gas and air of being pyrolyzed
Effect improves coal adaptability and condition range；Coke after pre- pyrolysis is sent into burner hearth in time after being pyrolyzed, and improves fuel
Initial temperature plays the role of surely firing.
Further, burner hearth surrounding is evenly distributed with the burner of two groups of opposed firings, and alternate run further shortens due to pyrolysis
Time interval caused by plate rotates.
Detailed description of the invention
Fig. 1 is the overall structure diagram of device described in present example.
Fig. 2 is the arrangement schematic diagram of burner described in present example.
Fig. 3 is pyrolysis cylinder schematic diagram described in present example.
Fig. 4 is casing partial enlargement diagram described in present example.
Fig. 5 is pyrolysis cylinder left view sectional view described in present example.
Fig. 6 is packing partial enlargement diagram described in present example
In figure: the first valve 1, coal scuttle 3, pulverizer coal feeder 4, mixing chamber 5, dials coal machine 6, pyrolysis plate 7, coke chamber at second valve 2
8, pre- pyrolysis chamber 9, third valve 10, air nozzle 11, the 4th valve 12, pyrolysis gas jets 13, coke nozzle 14, first jet
15, second nozzle 16, third nozzle 17, the 4th nozzle 18, center primary air duct 19, gas pipeline 20, flue gas recirculation
Pipeline 21, primary air piping 22 give powder pipeline 23, bearing 24, thermocouple 25, sealing tooth 26.
Specific embodiment
Below with reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.Example is not intended to limit the scope of the invention for illustrating the present invention.In description of the invention, it is to be understood that
, the orientation or positional relationship of the instructions such as term " center ", "upper", "lower" is that orientation based on the figure or position are closed
System is only the present invention and simplified description for ease of description, rather than spy must be had by indicating or imply signified device or element
Fixed orientation is constructed and is operated for specific orientation, thus should not be understood as the limitation to present invention protection content.
A kind of efficient after-flame of pulverized coal preheating solution of the invention and low nitrogen reduction apparatus and method, by dividing pyrolysis gas and coke
From fast and simple separation is carried out, realize that the pre- pyrolysis of coal dust is fired again；Specifically, utilizing the recycling pre- pyrolyzing coal of high-temperature flue gas
Pyrolysis gas and coke separation are realized that the low NOx of 3rd area burning fires again by the intermittent rotation of pyrolysis plate by powder.
A kind of efficient after-flame of pulverized coal preheating solution of the invention and low nitrogen reduction apparatus, as shown in Figure 1, including pre- pyrolysis chamber 9, burnt
Charcoal room 8, pyrolysis plate 7, flue gas recirculation pipeline 21, gas pipeline 20, center primary air duct 19, pyrolysis gas jets 13, sky
Gas jets 11, coke nozzle 14 and other accessories composition.It is described by coal scuttle 3, pulverizer coal feeder 4, group coal machine 6 and to be given to powder device
Powder pipeline 23 forms.The pyrolysis installation includes that pyrolysis cylinder dials coal machine, heart primary air duct 19, gas pipeline 20, flue gas again
Circulating line 21, pre- pyrolysis chamber 9, coke chamber 8, pyrolysis plate 7 etc..
In order to avoid as it is intermittent pyrolysis it is too long to the intermittent time caused by powder, as depicted in figs. 1 and 2, the present invention exists
The every face furnace wall of burner hearth is disposed with air nozzle 11, pyrolysis gas jets 13, coke nozzle 14 from top to bottom；Be pyrolyzed gas jets 13 or
The same layer of coke nozzle 14 is uniformly distributed on peripheries with two groups of nozzles, is opposed firing coal-powder boiler, two groups of opposite first jet 15- the
Three nozzles 17 and the 4th nozzle 18 of second nozzle 16- alternately put into operation, and realize continuously to powder or gas supply.
It is described to powder device by coal scuttle 3, pulverizer coal feeder 4, dial coal machine 6 and form to powder pipeline 23, in order to reach precisely to powder
Purpose, the pulverizer coal feeder 4 is connected to feedback device, can real-time reception coal pyrolysis characteristics, furnace outlet amount of nitrogen oxides,
The parameters such as operating load.It can be according to the coal pyrolysis characteristics, furnace outlet amount of nitrogen oxides, operation received by computer
The real-time parameters such as load calculate coal-supplying amount by method in the prior art, and reducing zone is made to be maintained at best reduction intensity section,
And then furnace outlet amount of nitrogen oxides is reduced to greatest extent.
In order to reach efficiently separating for pyrolysis gas and coke, the present invention is equipped with the pyrolysis installation of special construction, such as Fig. 3 institute
Show, is specifically divided into pre- pyrolysis chamber 9 and coke chamber 8 for cylinder is pyrolyzed by pyrolysis plate 7.The pyrolysis plate 7 is the surface of corundum material
More smooth plate, pyrolysis 7 both ends of plate are equipped with bearing 24, make pyrolysis plate 7 that can realize pyrolysis around pyrolysis cylinder center axis rotation
The separation of gas and pyrolysis coke.
As shown in figure 5, since pyrolysis plate 7 is rotating mechanism, it is impossible to which realization is fully sealed, in order to prevent coke chamber 8
Air largely leaks into pre- pyrolysis chamber 9 and causes coal dust firing, is equipped with pressure sensor in coke chamber 8 and pre- pyrolysis chamber 9, passes through tune
Whole tolerance, so that the high 70-90Pa of pressure of 9 pressure ratio coke chamber 8 of pre- pyrolysis chamber.Meanwhile it being pyrolyzed in the top and pyrolysis chamber of plate 7
Sealing tooth 26 is machined at wall.As shown in fig. 6, the sealing tooth 26 includes the seal convexity at middle part and the sealing of upper and lower ends
Boss；Seal boss is triangular in shape and is arranged outward along plate face, and the bevel edge adjacent with plate face slopes inwardly；Seal convexity and sealing
Boss is contour, arranges in pyrolysis 7 thickness direction of plate in gap.
As shown in figure 4, the front end of the pre- pyrolysis chamber 9 is connected to mixing chamber 5 and center primary air duct 19, natural respectively
Air pipe 20, flue gas recirculation pipeline 21.5 front end of mixing chamber and center primary air duct 19, gas pipeline 20, flue gas
Recirculating line 21 connects, and First air, natural gas, flue gas are sufficiently mixed in mixing chamber 5, carries pyrolysis gas as reduction NOx
Also Primordial Qi through pyrolysis gas jets 13 be sent into burner hearth reducing zone.The center primary air duct 19, gas pipeline 20, flue gas are again
Circulation line 21 be three layers of casing, center be center primary air piping 19, secondary outer layer be gas pipeline 20, outermost layer be flue gas again
Circulation line 21.First air, natural gas, flue gas are sufficiently mixed in mixing chamber 5, carry reduction of the pyrolysis gas as reduction NOx
Gas is sent into burner hearth reducing zone through pyrolysis gas jets 13.25 the real time measure of thermocouple, which is equipped with, in the outlet of pre- pyrolysis chamber 9 is pyrolyzed temperature
Degree.When coal is the less coal of the volatile matters such as anthracite, in order to enhance the reproducibility and combustion stability of reducing zone, can lead to
Enter appropriate natural gas；When boiler operatiopn is when compared with underload, and flue-gas temperature is difficult to meet pyrolysis temperature requirement, can be passed through few
Measure natural gas and air, natural gas burns heat release in oxygen deficient atmospheres, improves pre- pyrolysis room temperature.
Primary air piping 22 is terminated with before the coke chamber 8, the air that primary air piping 22 is sent into will be due to warm from coke chamber 8
The coke that solution plate 7 is rotated and settled under the effect of gravity is sent into coke nozzle 14, since coke passes through in pre- pyrolysis chamber 9
High temperature preheating is easy so catching fire when being sent into burner hearth, plays the role of surely firing.The upper and lower surface of pyrolysis plate 7 all passes through
High temperature resistant processing, two sides can be pyrolyzed, and while pyrolysis coke is sent into burner hearth by First air, being pyrolyzed can be same on plate 7
The pulverized coal pyrolysis in a Shi Jinhang lower period, the two do not conflict mutually, shorten the time interval of pyrolysis.
Method of the present invention is to be sent into the part high-temperature flue gas of furnace outlet from flue gas recirculation pipeline 21 to preheat
Solution room 9 makes coal dust fast pyrogenation, and the pyrolysis gas after pyrolysis is sent into the reducing zone of burner hearth by pyrolysis gas jets 13, by main combustion
A large amount of NOx that area generates are reduced into N2, being then sent into air from air nozzle 11 will not fire completely in the lower burning-out zone of temperature
The pyrolysis gas and coal dust firing of burning are totally.
25 the real time measure pyrolysis gas temperature of thermocouple is equipped in the outlet of pre- pyrolysis chamber 9.When because coal type change be anthracite
When the less coal of equal volatile matters, pyrolysis gas underproduces to restore the nitrogen oxides generated and cause furnace outlet nitrogen oxides inclined
Gao Shike is sent into appropriate natural gas by gas pipeline 20 and adjusts reduction effect, reduces discharged nitrous oxides；When boiler operatiopn exists
Flue-gas temperature is relatively low when under underload, is not enough to provide pyrolysis institute's calorific requirement, can also increase natural gas by gas pipeline
The air air quantity of conveying capacity and center primary air duct 19, natural gas burn heat release under oxygen debt environment, increase in pre- pyrolysis chamber 9
Heat release, improves temperature.Meanwhile positioned at the pyrolysis plate of pre- 9 center of pyrolysis chamber around 180 ° of center axis rotation, pyrolysis is generated
Coke be detached from pyrolysis plate under the effect of gravity and fall into coke chamber 8, realize the separation of pyrolysis gas and coke, then by primary air piping 22
The air of feeding is carried to be sent into from coke nozzle.The device has coal adaptability wide, flameholding, discharged nitrous oxides low etc.
Feature.
By taking quasi- eastern well work coal as an example:
The theoretical air requirement of 1kg well work coal are as follows:
V0=0.0889 (Car+0.375Sar)+0.265Har-0.0333Oar=6.749m3/kg
The amount of theoretical flue gas that 1kg well work coal generates are as follows:
Enthalpy of the flue gas that 1kg well work coal generates at 1000 DEG C are as follows:
Enthalpy of the flue gas that 1kg well work coal generates at 700 DEG C are as follows:
The heat that the flue gas that 1kg well work coal generates discharges in by 1000 DEG C of -700 DEG C of temperature-fall periods are as follows:
The heat that 1kg well work coal coal dust is absorbed by flue gas to 700 DEG C are as follows:
Qcoal=cm Δ t=1050kJ/kg
By example calculations it can be found that flue gas recycled amount only the total exhaust gas volumn of Zhan 1/3 less than the invention mainly passes through
Flue gas provide pyrolysis institute's calorific requirement, natural gas is oxygen debt burning auxiliary adjustment heat method be feasible.
During existing boiler improvement, furnace outlet, which draws flue gas recycled, to be influenced by existing device, only
When can draw low-temperature flue gas from back-end ductwork, the present invention can also be using combustion of natural gas as institute in pre- 9 pyrolytic process of pyrolysis chamber
The main source of calorific requirement, the flue gas recycled drawn from back-end ductwork, which introduces pre- pyrolysis chamber 9, can play homogeneous temperature field
Effect.
Wherein, the first valve 1 is for adjusting 20 flow of 19 air quantity of center primary air duct and gas pipeline, the second valve
2 are used to adjust the flow of primary air piping 22, third valve 10 is used to adjust flow, the 4th valve 12 of flue gas recirculation pipeline 21
For adjusting after-flame wind flow.
Specifically, a kind of efficient after-flame of pulverized coal preheating solution of the invention and low nitrogen restoring method.
Coal dust enters pulverizer coal feeder 4 by coal scuttle 3, and pulverizer coal feeder 4 is connected with computer, can be according to coal pyrolysis characteristics, burner hearth
It exports the real-time parameters such as amount of nitrogen oxides, operating load and coal-supplying amount is calculated by method in the prior art, it is ensured that reducing zone
Best reduction intensity section is operated in, the original nitrogen oxides of furnace outlet is lower, and coal dust enters through pulverizer coal feeder 4, to powder pipeline 23
Coal machine 6 is dialled, dialling coal machine can be such that coal dust is equably distributed in pre- pyrolysis chamber 9, and coal dust is prevented to be unevenly distributed the heap on pyrolysis plate 7
Product, the high temperature flue gas recycled being sent by flue gas recirculation pipeline 21 will be carried from left to right by dialling the coal dust that coal machine 6 comes out, subtracted
Pyrolysis plate left end dials coal machine 6 and exports coal dust accumulation less, during high temperature flue gas recycled carries coal dust from left to right and advances
It is deposited on pyrolysis plate 7 under the effect of gravity, under the pyrolysis of high temperature flue gas recycled, the pyrolysis gas of pulverized coal pyrolysis release
Enter pyrolysis gas jets 13 with flue gas recycled, is finally fed to burner hearth reducing zone.
Pyrolysis gas release finishes, and pyrolysis plate 7 is around 180 ° of cylinder center axis rotation of pyrolysis, at this point, being located at 7 top of pyrolysis plate originally
Pyrolysis coke be located at pyrolysis plate below, under the effect of gravity coke be detached from pyrolysis plate sedimentation, by one in coke infall process
The First air that secondary air pipe line 19 is sent into, which carries, is sent into coke nozzle 14, burner hearth primary zone is finally fed to, since coke is being pyrolyzed
It is preheated in the process by high temperature flue gas recycled, improves the combustion stability of coke.
The flue gas containing more nitrogen oxides that primary zone generates enters reducing zone, and reducing zone excess air coefficient is about
0.6, be reducing atmosphere, pyrolysis gas by pulverized-coal fired boiler primary zone burning generate most of NOx be reduced into N2, then flue gas into
Enter burning-out zone and mixed with the burnout degree that burnout degree nozzle 11 is sent into, realizes completely burned.Burning-out zone excess air coefficient is 1.2 left
The right side, finally, flue gas completes the combustion process that pulverized coal pyrolysis fires low NOx again by superheaters at different levels.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention.It should be pointed out that pair
For those skilled in the art, without departing from the inventive concept of the premise, several deformations can also be made and changed
Into all within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in the present invention
Protection scope within.
Claims (10)
1. a kind of efficient after-flame of pulverized coal preheating solution and low nitrogen reduction apparatus, which is characterized in that including boiler, it is pyrolyzed cylinder, it is coaxial to turn
The dynamic pyrolysis plate (7) being arranged in pyrolysis cylinder, and be arranged in pyrolysis cylinder top to powder device；
The pyrolysis plate (7) is horizontally disposed, and intermittent around central axis overturning；Pyrolysis plate (7) is divided into top for cylinder is pyrolyzed
Pre- pyrolysis chamber (9) and lower part coke chamber (8)；The front end of pre- pyrolysis chamber (9) is provided with for providing the mixed gas of pyrolysis atmosphere
Room (5), rear end connection setting pyrolysis gas jets (13)；Primary air piping (22) are arranged in the front end of coke chamber (7), rear end connection setting
Coke nozzle (14)；
Reducing zone setting pyrolysis gas jets (13) of the boiler furnace, burning-out zone setting control nozzle (11), primary zone setting
Coke nozzle (14)；Input terminal of the furnace outlet flue gas through flue gas recirculation pipeline (21) connection mixing chamber (5), mixing chamber (5)
Input terminal be additionally provided with center primary air duct (19) and gas pipeline (20).
2. the efficient after-flame of a kind of pulverized coal preheating solution according to claim 1 and low nitrogen reduction apparatus, which is characterized in that described
Include the coal scuttle (3) set gradually, pulverizer coal feeder (4) to powder device, to powder pipeline (23) and dial coal machine (6), group coal machine (6) are leaned on
The side setting of nearly mixed air vessel (5).
3. the efficient after-flame of a kind of pulverized coal preheating solution according to claim 2 and low nitrogen reduction apparatus, which is characterized in that described
Pulverizer coal feeder (4) be provided with feed back control system, feed back control system is used for real-time reception coal pyrolysis characteristics, furnace outlet nitrogen
Oxide content and operating load parameter, and Limestone control pulverizer coal feeder (4) are calculated according to the parameter received.
4. the efficient after-flame of a kind of pulverized coal preheating solution according to claim 1 and low nitrogen reduction apparatus, which is characterized in that described
Pyrolysis plate (7) plate-like setting, be made of corundum；Pyrolysis plate (7) both ends are equipped with bearing (24), and are being pyrolyzed with setting
Driving device connection outside cylinder.
5. the efficient after-flame of a kind of pulverized coal preheating solution according to claim 1 and low nitrogen reduction apparatus, which is characterized in that described
It is pyrolyzed at the end and pyrolysis cylinder inner wall of plate (7) and is provided with sealing tooth (26)；Coke chamber (7) and pre- pyrolysis chamber (9) are equipped with pressure
Force snesor, the high 70-90Pa of pressure of pre- pyrolysis chamber (9) pressure ratio coke chamber (7).
6. the efficient after-flame of a kind of pulverized coal preheating solution according to claim 1 and low nitrogen reduction apparatus, which is characterized in that pre-
The outlet of pyrolysis chamber (9) is equipped with thermocouple (25) the real time measure pyrolysis gas temperature, when temperature is lower than given threshold, is passed through natural
Gas.
7. the efficient after-flame of a kind of pulverized coal preheating solution according to claim 1 and low nitrogen reduction apparatus, which is characterized in that boiler
The every face furnace wall of burner hearth is disposed with air nozzle (11), pyrolysis gas jets (13) and coke nozzle (14) from top to bottom；Pyrolysis gas
The same layer of nozzle (13) or coke nozzle (14) is uniformly distributed on peripheries with two groups of nozzles, is opposed firing coal-powder boiler, opposite nozzle
It is one group, two groups of nozzles are separately connected the pre- pyrolysis chamber (9) of two pyrolysis cylinders and alternately put into operation, for continuously supplying or to powder.
8. the efficient after-flame of a kind of pulverized coal preheating solution according to claim 1 and low nitrogen reduction apparatus, which is characterized in that mixed gas
The center primary air duct (19), gas pipeline (20) and flue gas recirculation pipeline (21) of room (5) input terminal are successively by introversion
It is coaxially arranged outside；It is arranged the first valve (1) on center primary air duct (19) and gas pipeline (20), on primary air piping (22)
It is arranged the second valve (2), third valve (10) is set on flue gas recirculation pipeline (21), connects the burnout degree of air nozzle (11)
4th valve (12) is set on pipeline.
9. a kind of efficient after-flame of pulverized coal preheating solution and low nitrogen restoring method, which is characterized in that be based on claim 1-8 any one
The device,
The part high-temperature flue gas of furnace outlet, which is sent into pre- pyrolysis chamber (9) from flue gas recirculation pipeline (21), makes pulverized coal pyrolysis, heat
Pyrolysis gas after solution is sent into the reducing zone of burner hearth by pyrolysis gas jets (13), and the NOx that primary zone generates is reduced into N2,
Then air is sent into burning-out zone by imperfect combustion pyrolysis gas and coal dust firing from air nozzle (11)；
Meanwhile positioned at the pyrolysis plate of pre- pyrolysis chamber (9) center around 180 ° of center axis rotation, pyrogenous origin coke is in gravity
The lower pyrolysis plate that is detached from of effect falls into coke chamber (8), and pyrolysis gas is separated with coke, then is carried by the air that primary air piping (22) are sent into
It is pyrolyzed the coke generated and is sent into burner hearth primary zone from coke nozzle (14).
10. the efficient after-flame of a kind of pulverized coal preheating solution according to claim 9 and low nitrogen restoring method, which is characterized in that
When because of coal type change, pyrolysis gas underproduces to restore the nitrogen oxides generated and cause furnace outlet nitrogen oxides higher
When, natural gas, which is sent into, by gas pipeline (20) adjusts reduction effect；
At low load when flue-gas temperature is relatively low is not enough to provide pyrolysis institute's calorific requirement, natural gas is increased by gas pipeline
Conveying capacity and center primary air piping primary air flow increase the interior heat release in pre- pyrolysis chamber (9).
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