CN106196020A - The tertiary air of pulverized-coal fired boiler is made into the method and device that First air carries out burning - Google Patents

The tertiary air of pulverized-coal fired boiler is made into the method and device that First air carries out burning Download PDF

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Publication number
CN106196020A
CN106196020A CN201510228309.0A CN201510228309A CN106196020A CN 106196020 A CN106196020 A CN 106196020A CN 201510228309 A CN201510228309 A CN 201510228309A CN 106196020 A CN106196020 A CN 106196020A
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China
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air
wind
tertiary air
unit
burning
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CN201510228309.0A
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Chinese (zh)
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张圣伟
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上海四方锅炉集团工程成套股份有限公司
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Priority to CN201510228309.0A priority Critical patent/CN106196020A/en
Publication of CN106196020A publication Critical patent/CN106196020A/en

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Abstract

The invention discloses and a kind of into the tertiary air of pulverized-coal fired boiler is made the method and device that First air carries out burning, method step includes that tertiary air carries out concentrating and separating obtains thick coal culm tertiary air and thin powdered coal tertiary air, the First air of thick coal culm tertiary air and feeding burner hearth is mixed together, by the First air after mixing thick coal culm tertiary air, secondary wind is sprayed in feeding burner hearth and the formation primary combustion zone that burns respectively, simultaneously by thin powdered coal tertiary air, secondary wind is sprayed respectively and is sent into burner hearth and form the combustion zone again for low oxygen combustion reduction NOx in the burning of the top of described primary combustion zone;Device includes main burner noz(zle) unit, again burner noz(zle) unit and tertiary air separative element.Denitrification effect of the present invention is good, NOx emission concentration is low, it is possible to prevents furnace outlet flue gas overtemperature, solve that unburned carbon in flue dust is high and the situation of incomplete combustion, the burning operation conditions of boiler improved.

Description

The tertiary air of pulverized-coal fired boiler is made into the method and device that First air carries out burning
Technical field
The present invention relates to boiler coal-ash field of combustion technology, be specifically related to a kind of make the tertiary air of pulverized-coal fired boiler into First air and carry out The method and device of burning.
Background technology
When generally on station boiler, burning coal is the colm of anthracite and low volatile, pulverized coal preparation system uses intermediate storage-type Pulverized coal carried by hot air mode, is now divided into three kinds the air required for boiler combustion in pulverized-coal fired boiler: be referred to as First air, two Secondary wind, tertiary air.First air be by pipeline pulverized coal conveying enter burner hearth part air, generally according to volatile matter size, The mode of powder process and the transportation concentration of primary mixture determine the ratio of primary air flow, coal dust early stage ignition to be met Amount of oxygen.Secondary wind is to be sent into the hot-air of burner hearth by the single nozzles of burner, enters after burner hearth the most gradually and First air Mix mutually.Secondary wind provides oxygen for coal dust firing, and can add the agitation of air blast, and the burning completely for coal dust provides oxygen. Tertiary air is when burning the fuel such as the most fire-hazardous anthracite, low-volatite coal, the gas after pulverized coal preparation system separates coal dust, Also referred to as weary gas.In tertiary air with 10~15 coal dust, inject directly into burner hearth by single tertiary air pipeline and nozzle.
Along with formulation and the enforcement of the new environmental protection standard of country, station boiler emission request is improved constantly.Therefore pulverized-coal fired boiler is led to Often will carry out low NO, find in the transformation of burner when put into operation tertiary air time will generate substantial amounts of NOx, cause Atmospheric pollution.When power plant's actual motion, often with 15~the fine breeze of 20% in tertiary air, owing to the temperature of tertiary air is 60 DEG C, the temperature of wind is low makes coal dust therein be difficult to catch fire, and causes combustion process to postpone.Therefore run at pulverized coal preparation system when boiler Often causing boiler furnace outlet flue gas overtemperature when putting into tertiary air burning, water-spraying control amount increases, and unburned carbon in flue dust increases, combustion Burn not exclusively.Air capacity additionally, due to tertiary air is big, and oxygen content causes NOx emission concentration over-standard more.So the depositing of tertiary air It is being disadvantageous to burning.The such as boiler of a 220t/h, boiler uses anthracite, and burner is the tangential firing of positive corner. Before being provided without low NO transformation, using two layers of First air interval to arrange, pulverized coal carried by hot air, spout is arranged the most suitable Sequence is 3221212.Torch oil gun is arranged in lower row's overfire air jet.The burner carrying out before transformation flue gas The test of discharge, usual smoke emissioning concentration is NOx=800~1000mg/Nm3.When the situation disabling pulverized coal preparation system and tertiary air Under, smoke emissioning concentration is NOx=700~780mg/Nm3.Find to disable at tertiary air in the case of boiler combustion test In the case of, the concentration of emission of NOx can be substantially reduced, and finds that the load of boiler can drop in the case of tertiary air disables simultaneously Low by about 15%.Thus the coal powder density being converted in tertiary air reaches 15~20%, owing to the air quantity of tertiary air is big, temperature is low, The jet expansion airflow design of tertiary air is 50~60m/s by conventional burner design.The breeze airflow making tertiary air is permissible It is penetrated into ignition in the combustion heat flue gas group of burner hearth.Actually owing to tradition tertiary air air quantity is all towards main burner top, In the case of pulverized coal preparation system runs, bigger tertiary air quantity, wherein with substantial amounts of oxygen, to the destruction of reducing zone relatively Greatly.Thus result in NOx emission concentration to increase.Simultaneously because the impact that tertiary air quantity is bigger than normal, put on the top of hearth combustor Run and often postponed coal dust combustion process in burner hearth, make the flue-gas temperature of boiler furnace outlet raise, the water spray of superheater Amount strengthens.Especially after low NO is transformed, it occur frequently that extend, owing to carrying out fractional combustion region and tertiary air, the shadow burnt Ring, cause the flue-gas temperature of furnace outlet to raise, the situation such as boiler furnace outlet coking, badly result, the pot such as incomplete combustion Stove can only reduce load operation.The most how to solve the impact of tertiary air, with satisfied country new environmental protection standard, station boiler is discharged Requirement, has become as the key technical problem of low NO transformation.
Summary of the invention
The technical problem to be solved in the present invention is to provide one, and denitrification effect is good, NOx emission concentration is low, it is possible to prevent furnace outlet Flue gas overtemperature, solve that unburned carbon in flue dust is high and the situation of incomplete combustion, improve boiler burning operation conditions by pulverized-coal fired boiler Tertiary air make the method and device that First air carries out burning into.
For solving above-mentioned technical problem, the technical solution used in the present invention is:
The present invention provides a kind of and the tertiary air of pulverized-coal fired boiler makes into the method that First air carries out burning, and step includes: by tertiary air Carry out concentrating and separating and obtain thick coal culm tertiary air and thin powdered coal tertiary air, by thick coal culm tertiary air together with sending into the First air of burner hearth Mixing, sprays in feeding burner hearth and the formation primary combustion zone that burns by the First air after mixing thick coal culm tertiary air, secondary wind respectively, Thin powdered coal tertiary air, secondary wind are sprayed respectively feeding burner hearth simultaneously and is used for low in the burning formation of the top of described primary combustion zone The combustion zone again of oxygen burning reduction NOx.
Preferably, also include that secondary wind is injected into burner hearth formation on the top of combustion zone again is used for the unknown rational number that burns Burn region, described in burn region and be positioned on the upside of primary combustion zone at 2~3m.
Preferably, the described top in combustion zone again is injected into burner hearth and forms the region that burns for the unknown rational number that burns Secondary wind specifically uses swing mode to spray in burner hearth.
Preferably, described primary combustion zone is correspondingly provided with 5 layers of air inlet unit, and described 5 layers of air inlet unit are from bottom to up with layer as list Position is followed successively by secondary wind air door, First air nozzle, secondary wind air door, is mixed with the First air nozzle of thick coal culm tertiary air, secondary Wind air door;Described combustion zone again is correspondingly provided with 2 layers of air inlet unit, and described 2 layers of air inlet unit are sequentially fed into light from bottom to up Coal dust tertiary air nozzle, secondary wind air door;The described region that burns is correspondingly provided with 2 layers of nozzle, and described 2 layers of nozzle are secondary wind Nozzle.
The present invention also provides for a kind of the tertiary air of pulverized-coal fired boiler making the device that First air carries out burning, including main burner noz(zle) list into Unit, again burner noz(zle) unit and tertiary air separative element, described main burner noz(zle) unit is respectively by pipeline and First air, secondary Wind facies connects, and the thick coal culm tertiary air that the pipeline of this First air exports with described tertiary air separative element is connected by pipeline, described Again burner noz(zle) unit be connected with secondary wind by pipeline and and the thin powdered coal tertiary air of described tertiary air separative element output pass through Pipeline is connected, and the input of described tertiary air separative element is connected with tertiary air, and described main burner noz(zle) unit will mix thick coal culm First air after tertiary air, secondary wind are sprayed in feeding burner hearth and the formation primary combustion zone that burns, described burner noz(zle) list more respectively Thin powdered coal tertiary air, secondary wind are sprayed feeding burner hearth and are used for hypoxia in the burning formation of the top of described primary combustion zone by unit respectively The combustion zone again of burning reduction NOx.
Preferably, also include burning nozzle unit, described in burn nozzle unit and be connected with secondary wind by pipeline, described in burn spray Mouth unit is positioned at the top of burner noz(zle) unit again, and described in burn unit secondary wind be injected on the top of combustion zone again Burner hearth is formed and burns region for burn unknown rational number, described in burn region and be positioned on the upside of primary combustion zone at 2~3m.
Preferably, the nozzle burning nozzle unit described in is movable nozzle.
Preferably, described main burner noz(zle) unit includes 5 layers of air inlet unit, and described 5 layers of air inlet unit are from bottom to up with layer as list Position is followed successively by secondary wind air door, First air nozzle, secondary wind air door, is mixed with the First air nozzle of thick coal culm tertiary air, secondary Wind air door;The described unit of burner noz(zle) again includes 2 layers of air inlet unit, and described 2 layers of air inlet unit are sequentially fed into light from bottom to up Coal dust tertiary air nozzle, secondary wind air door;The described nozzle unit that burns includes that 2 layers of nozzle, described 2 layers of nozzle are secondary wind Nozzle.
Preferably, described tertiary air separative element includes that cyclone separator, storage struggle against, to tube cell, to powder valve and blender, institute The input port stating cyclone separator is connected with tertiary air, and the thin powdered coal tertiary air of the outlet output at described cyclone separator top passes through Pipeline is connected with burner noz(zle) unit again, and the outlet bottom described cyclone separator is provided with storage bucket, and the lower end of described storage bucket leads to Cross and be connected with the blender on the First air pipeline being located at main burner noz(zle) unit to tube cell, described be located on tube cell to powder valve, The thick coal culm tertiary air of the outlet output bottom described cyclone separator passes sequentially through storage bucket, to tube cell with to powder valve, blender Send into the First air pipeline of main burner noz(zle) unit.
The present invention has an advantage that
1, the research and analysis of the present invention impact of tertiary air, based on tertiary air air-coal separating, carries out concentrating and separating by tertiary air and obtains To thick coal culm tertiary air and thin powdered coal tertiary air, the First air of thick coal culm tertiary air and feeding burner hearth is mixed together, will mix dense First air after coal dust tertiary air, secondary wind are sprayed in feeding burner hearth and the formation primary combustion zone that burns respectively, thus improve master The coal powder density of combustion zone, reduces the oxygen concentration of primary combustion zone, also serves as the basic means of denitrogenation in stove, reduces The purpose of NOx emission concentration, can reduce the concentration of emission 100~150mg/Nm of NOx in the combustion case of identical boiler3
2, tertiary air is carried out concentrating and separating and obtains thick coal culm tertiary air and thin powdered coal tertiary air by the present invention, by thin powdered coal tertiary air, Secondary wind is sprayed respectively and is sent into burner hearth and the top of described primary combustion zone burning formation firing again for low oxygen combustion reduction NOx Burn region, then combustion zone is one of necessary requirement reducing nitrogen oxides, such that it is able to greatly reduce NOx emission concentration, Being prevented from furnace outlet flue gas overtemperature, solving unburned carbon in flue dust increases and the situation of incomplete combustion, improves the burning fortune of boiler Row situation.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or prior art In description, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only the one of the present invention A little embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to these Accompanying drawing obtains other accompanying drawing.
Fig. 1 is the application principle structural representation of the embodiment of the present invention.
Fig. 2 is the structural representation of the embodiment of the present invention.
Fig. 3 is the layout plan structure schematic diagram of main burner noz(zle) unit in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings the preferred embodiments of the present invention are described in detail, so that advantages and features of the invention can be easier to It is readily appreciated by one skilled in the art, thus protection scope of the present invention is made apparent clear and definite defining.
As it is shown in figure 1, the operation principle that the tertiary air of pulverized-coal fired boiler is made into the device that First air carries out burning by the present embodiment is: Tertiary air is carried out concentrating and separating and obtains thick coal culm tertiary air and thin powdered coal tertiary air, by thick coal culm tertiary air and the one of feeding burner hearth Secondary wind is mixed together, and by the First air after mixing thick coal culm tertiary air, secondary wind is sprayed respectively in feeding burner hearth and formation of burning is main Combustion zone, sprays thin powdered coal tertiary air, secondary wind feeding burner hearth simultaneously respectively and burning is formed on the top of primary combustion zone Combustion zone again for low oxygen combustion reduction NOx.The present embodiment also includes being injected into secondary wind on the top of combustion zone again Enter burner hearth to be formed and burn region for the unknown rational number that burns, burn region and be positioned on the upside of primary combustion zone at 2~3m.This reality Execute in example, be injected into burner hearth on the top of combustion zone again and form the secondary wind tool burning region for the unknown rational number that burns Body is to use swing mode to spray in burner hearth.In the present embodiment, primary combustion zone is correspondingly provided with 5 layers of air inlet unit, described 5 layers Air inlet unit is followed successively by secondary wind air door, First air nozzle, secondary wind air door from bottom to up in units of layer, is mixed with thick coal culm The First air nozzle of tertiary air, secondary wind air door;Described combustion zone again is correspondingly provided with 2 layers of air inlet unit, described 2 layers of air intake Unit is sequentially fed into thin powdered coal tertiary air nozzle, secondary wind air door from bottom to up;The described region that burns is correspondingly provided with 2 layers of nozzle, Described 2 layers of nozzle are overfire air jet.
As depicted in figs. 1 and 2, the tertiary air of pulverized-coal fired boiler is made into the device that First air carries out burning and includes main combustion by the present embodiment Burning nozzle unit 1, again burner noz(zle) unit 2 and tertiary air separative element 3, main burner noz(zle) unit 1 is respectively by pipeline and Secondary wind, secondary wind are connected, and the thick coal culm tertiary air of the pipeline of this First air and tertiary air separative element 3 output is by pipeline phase Connect, then burner noz(zle) unit 2 is connected with secondary wind by pipeline and and the thin powdered coal tertiary air of tertiary air separative element 3 output Being connected by pipeline, the input of tertiary air separative element 3 is connected with tertiary air, and main burner noz(zle) unit 1 will mix thick coal culm First air after tertiary air, secondary wind are sprayed in feeding burner hearth and the formation primary combustion zone that burns respectively, then burner noz(zle) unit 2 Thin powdered coal tertiary air, secondary wind are sprayed respectively feeding burner hearth and is used for low oxygen combustion also in the burning formation of the top of primary combustion zone The combustion zone again of former NOx.And, the thin powdered coal tertiary air coal dust of tertiary air separative element 3 output is the most rare, it is also possible to Use as secondary wind.
As in figure 2 it is shown, the present embodiment also includes burning nozzle unit 4, burn nozzle unit 4 and be connected with secondary wind by pipeline, Burn nozzle unit 4 and be positioned at the top of burner noz(zle) unit 2 again, and burn nozzle unit 2 by secondary wind in combustion zone again Top is injected into burner hearth and is formed and burn region for the unknown rational number that burns, burn region be positioned on the upside of primary combustion zone 2~ At 3m.Tertiary air is carried out concentrating and separating and obtains thick coal culm tertiary air and thin powdered coal tertiary air by the present embodiment, defines main combustion zone Territory, sprays in feeding burner hearth and the formation primary combustion zone that burns by the First air after mixing thick coal culm tertiary air, secondary wind respectively, Thin powdered coal tertiary air, secondary wind are sprayed respectively feeding burner hearth simultaneously and is used for low in the burning formation of the top of described primary combustion zone The combustion zone again of oxygen burning reduction NOx, hence in so that burned flame center have dropped in burner hearth, so that furnace outlet Cigarette temperature rise a lot, burning nozzle unit 4 even if increasing, also not resulting in furnace outlet coking, injection flow rate increases, boiler The situation of load reduction.
In the present embodiment, the nozzle burning nozzle unit 4 is movable nozzle.Movable nozzle both can swing up and down, simultaneously The air that with horizontal hunting, can make again jet expansion both can control to be injected into direction and the time of combustion zone, can adjust again The size of joint jet-stream wind adjusts the size of burning swirling eddy.
As in figure 2 it is shown, main burner noz(zle) unit 1 includes 5 layers of air inlet unit, 5 layers of air inlet unit are from bottom to up in units of layer Be followed successively by secondary wind air door 1#1, First air nozzle 1#2, secondary wind air door 1#3, be mixed with thick coal culm tertiary air First air spray Mouth 1#4, secondary wind air door 1#5;Burner noz(zle) unit 2 includes that 2 layers of air inlet unit, 2 layers of air inlet unit depend on from bottom to up again Secondary it is admitted to thin powdered coal tertiary air nozzle 2#1, secondary wind air door 2#2;Burn nozzle unit 4 and include 2 layers of nozzle 4#1~4#2, 2 layers of nozzle 4#1~4#2 are overfire air jet.
As depicted in figs. 1 and 2, the present embodiment can be divided into 9 layers from bottom to up.
1,5 layers of air inlet unit of main burner noz(zle) unit 1 constitute 1~5 layer, including First air nozzle 1#2 be mixed with The First air nozzle 1#4 of thick coal culm tertiary air, the First air of the First air nozzle 1#4 entrance being mixed with thick coal culm tertiary air contains The thick coal culm tertiary air of First air and mixing, the concentration of coal dust is high, can be by the oxygen amount of this primary combustion zone by two in this region Secondary wind air door 1#1, secondary wind air door 1#3, secondary wind air door 1#5 totally three secondary wind air doors are controlled such that it is able to pass through The air quantity reducing secondary nozzle makes oxygen amount reduce, and reduces the NOx concentration of generation.
2,2 layers of air inlet unit of burner noz(zle) unit 2 constitute 6~7 layers again, and this region is formed conduct by 6 layers~7 layers of nozzle Combustion zone again, owing to coal powder density is low, the NOx that the burning of trace can make part generate is reduced.
3, burn that 2 layers of nozzle 4#1~4#2 of nozzle unit 4 are constituted 8~9 layers, nozzle 4#1~4#2 can be as SOFA wind Nozzle (i.e. burnt wind), burns for the secondary wind of 20~30% is arranged in the height composition of distance primary combustion zone 2~3m Region, makes unburned coal dust burned complete in this region, reduces the generation of NOx.And can between 8 layers~9 layers of nozzle Individually to adjust, can adjust respectively and swing up and down or horizontal hunting, add the means of firing optimization, can adjust again simultaneously The flue-gas temperature deviation of joint furnace outlet.
As in figure 2 it is shown, the tertiary air separative element 3 of the present embodiment include cyclone separator 31, storage bucket 32, to tube cell 33, To powder valve 34 and blender 35, the input port of cyclone separator 31 is connected with tertiary air, the outlet at cyclone separator 31 top The thin powdered coal tertiary air of output is connected with burner noz(zle) unit 2 again by pipeline, and the outlet bottom cyclone separator 31 is provided with storage Bucket 32, the lower end of storage bucket 32 is by tube cell 33 and the blender 35 being located on the First air pipeline of main burner noz(zle) unit Being connected, be located on tube cell 33 to powder valve 34, the thick coal culm tertiary air of the outlet output bottom cyclone separator 31 passes sequentially through Storage bucket 32, to tube cell 33 with send into the First air pipeline of main burner noz(zle) unit 1 to powder valve 34, blender 35.
As it is shown on figure 3, the burner hearth of pulverized-coal fired boiler is square in the present embodiment, the most main burner noz(zle) unit 1, burn again Nozzle unit 2 still burns nozzle unit 4, and each layer of air door all includes that 4 air doors, each layer of nozzle all include 4 nozzles, And 4 air doors or nozzle are injected into the burner hearth of pulverized-coal fired boiler respectively, with ground floor secondary wind along four angles of square burner hearth As a example by air door 1#1, this layer include secondary wind air door 1#1-1, secondary wind air door 1#1-2,1, secondary wind air door 1#1-3,1, Secondary wind air door 1#1-4 totally four air doors.Pass through said structure, it is ensured that in burner hearth, the stable and burning of each combustion zone is fully. Certainly, it is also possible to use air door or the nozzle of each layer of other arrangements as required, be not described in detail in this.
The foregoing is only the preferred embodiment of the present invention, protection scope of the present invention is not limited in above-mentioned embodiment, all The technical scheme being belonging to the principle of the invention belongs to protection scope of the present invention.For a person skilled in the art, not The some improvements and modifications carried out on the premise of departing from the principle of the present invention, these improvements and modifications also should be regarded as the protection of the present invention Scope.

Claims (9)

1. the tertiary air of pulverized-coal fired boiler is made into the method that First air carries out burning by one kind, it is characterised in that step includes: by three times Wind carries out concentrating and separating and obtains thick coal culm tertiary air and thin powdered coal tertiary air, by thick coal culm tertiary air and the First air one of feeding burner hearth Play mixing, the First air after mixing thick coal culm tertiary air, secondary wind are sprayed respectively in feeding burner hearth and burnt and form main combustion zone Territory, sprays thin powdered coal tertiary air, secondary wind feeding burner hearth simultaneously respectively and burning forms use on the top of described primary combustion zone Combustion zone again in low oxygen combustion reduction NOx.
The most according to claim 1 the tertiary air of pulverized-coal fired boiler making the method that First air carries out burning into, its feature exists In: also include being injected into secondary wind on the top of combustion zone again that burner hearth forms the unknown rational number that is used for burning burns region, The described region that burns is positioned on the upside of primary combustion zone at 2~3m.
The most according to claim 2 the tertiary air of pulverized-coal fired boiler making the method that First air carries out burning into, its feature exists In: the described top in combustion zone again is injected into burner hearth and forms the secondary wind tool burning region for the unknown rational number that burns Body is to use swing mode to spray in burner hearth.
The most according to claim 3 the tertiary air of pulverized-coal fired boiler making the method that First air carries out burning into, its feature exists In: described primary combustion zone is correspondingly provided with 5 layers of air inlet unit, and described 5 layers of air inlet unit are followed successively by from bottom to up in units of layer Secondary wind air door, First air nozzle, secondary wind air door, it is mixed with the First air nozzle of thick coal culm tertiary air, secondary wind air door; Described combustion zone again is correspondingly provided with 2 layers of air inlet unit, and described 2 layers of air inlet unit are sequentially fed into thin powdered coal three times from bottom to up Wind nozzle, secondary wind air door;The described region that burns is correspondingly provided with 2 layers of nozzle, and described 2 layers of nozzle are overfire air jet.
5. the tertiary air of pulverized-coal fired boiler is made into the device that First air carries out burning by one kind, it is characterised in that: include main burner noz(zle) Unit, again burner noz(zle) unit and tertiary air separative element, described main burner noz(zle) unit respectively by pipeline and First air, two Secondary wind facies connects, and the thick coal culm tertiary air that the pipeline of this First air exports with described tertiary air separative element is connected by pipeline, institute State again burner noz(zle) unit be connected with secondary wind by pipeline and and the thin powdered coal tertiary air of described tertiary air separative element output logical Piping is connected, and the input of described tertiary air separative element is connected with tertiary air, and described main burner noz(zle) unit will mix dense coal First air after powder tertiary air, secondary wind are sprayed in feeding burner hearth and the formation primary combustion zone that burns, described burner noz(zle) more respectively Thin powdered coal tertiary air, secondary wind are sprayed feeding burner hearth and are used for low in the burning formation of the top of described primary combustion zone by unit respectively The combustion zone again of oxygen burning reduction NOx.
The most according to claim 5 the tertiary air of pulverized-coal fired boiler making the device that First air carries out burning into, its feature exists In: also include burning nozzle unit, described in burn nozzle unit and be connected with secondary wind by pipeline, described in burn nozzle unit position In the top of burner noz(zle) unit again, and described in burn nozzle unit secondary wind be injected into burner hearth on the top of combustion zone again Formed and burn region for burn unknown rational number, described in burn region and be positioned on the upside of primary combustion zone at 2~3m.
The most according to claim 6 the tertiary air of pulverized-coal fired boiler making the device that First air carries out burning into, its feature exists In: described in burn the nozzle of nozzle unit be movable nozzle.
The most according to claim 7 the tertiary air of pulverized-coal fired boiler making the device that First air carries out burning into, its feature exists In: described main burner noz(zle) unit includes that 5 layers of air inlet unit, described 5 layers of air inlet unit are followed successively by from bottom to up in units of layer Secondary wind air door, First air nozzle, secondary wind air door, it is mixed with the First air nozzle of thick coal culm tertiary air, secondary wind air door; The described unit of burner noz(zle) again includes that 2 layers of air inlet unit, described 2 layers of air inlet unit are sequentially fed into thin powdered coal three times from bottom to up Wind nozzle, secondary wind air door;The described nozzle unit that burns includes that 2 layers of nozzle, described 2 layers of nozzle are overfire air jet.
9. according to described in any one in claim 5~8 into the tertiary air of pulverized-coal fired boiler being made the dress that First air carries out burning Put, it is characterised in that: described tertiary air separative element include cyclone separator, storage bucket, to tube cell, to powder valve and blender, The input port of described cyclone separator is connected with tertiary air, and the thin powdered coal tertiary air of the outlet output at described cyclone separator top leads to Piping is connected with burner noz(zle) unit again, and the outlet bottom described cyclone separator is provided with storage bucket, the lower end of described storage bucket By being connected with the blender on the First air pipeline being located at main burner noz(zle) unit to tube cell, described it is located on tube cell to powder valve, The thick coal culm tertiary air of the outlet output bottom described cyclone separator passes sequentially through storage bucket, to tube cell with to powder valve, blender Send into the First air pipeline of main burner noz(zle) unit.
CN201510228309.0A 2015-05-06 2015-05-06 The tertiary air of pulverized-coal fired boiler is made into the method and device that First air carries out burning CN106196020A (en)

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JPH01200106A (en) * 1988-02-04 1989-08-11 Babcock Hitachi Kk Method and device of feeding combustion air
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CN203718765U (en) * 2014-02-10 2014-07-16 四川川锅锅炉有限责任公司 Low-NOx burner with tertiary air
CN204593369U (en) * 2015-05-06 2015-08-26 上海四方锅炉集团工程成套股份有限公司 The tertiary air of pulverized-coal fired boiler is made into the device that First air carries out burning

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01200106A (en) * 1988-02-04 1989-08-11 Babcock Hitachi Kk Method and device of feeding combustion air
CN1757966A (en) * 2004-10-10 2006-04-12 辽宁东电燃烧设备有限公司 Combustion technology of low nitrogen oxide
CN103216821A (en) * 2013-04-27 2013-07-24 东方电气集团东方锅炉股份有限公司 Multi-stage stratified combustion system and method for primary air and secondary air of boiler
CN103672863A (en) * 2013-12-31 2014-03-26 北京国电龙高科环境工程技术有限公司 Low-nitrogen combustion device for medium storage cabin hot air powder feeding boiler and use method thereof
CN203718765U (en) * 2014-02-10 2014-07-16 四川川锅锅炉有限责任公司 Low-NOx burner with tertiary air
CN204593369U (en) * 2015-05-06 2015-08-26 上海四方锅炉集团工程成套股份有限公司 The tertiary air of pulverized-coal fired boiler is made into the device that First air carries out burning

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Application publication date: 20161207