CN107084387A - The low NOx Horizontal CFB Boilers of multipaths that a kind of flue gas strile-backs - Google Patents
The low NOx Horizontal CFB Boilers of multipaths that a kind of flue gas strile-backs Download PDFInfo
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- CN107084387A CN107084387A CN201710437158.9A CN201710437158A CN107084387A CN 107084387 A CN107084387 A CN 107084387A CN 201710437158 A CN201710437158 A CN 201710437158A CN 107084387 A CN107084387 A CN 107084387A
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- air
- strile
- combustion chamber
- flue gas
- house steward
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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
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
- F23C10/04—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
- F23C10/06—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone the circulating movement being promoted by inducing differing degrees of fluidisation in different parts of the bed
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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
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
- F23C10/04—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
- F23C10/08—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases
- F23C10/10—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases the separation apparatus being located outside the combustion chamber
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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
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
-
- 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
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/24—Devices for removal of material from the bed
- F23C10/26—Devices for removal of material from the bed combined with devices for partial reintroduction of material into the bed, e.g. after separation of agglomerated parts
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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
- F23C2201/00—Staged combustion
- F23C2201/30—Staged fuel supply
-
- 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
- F23C2202/00—Fluegas recirculation
-
- 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
- F23C2206/00—Fluidised bed combustion
- F23C2206/10—Circulating fluidised bed
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The low NOx Horizontal CFB Boilers of multipaths that a kind of flue gas strile-backs, including air compartment, main combustion chamber, a subsidiary combustion chamber etc., lower overfire air port is provided with below main combustion chamber side wall, lower overfire air port bottom is provided with lower secondary air box；Ceiling is provided with overhead central secondary wind jet pipe and overhead curtain Secondary Air jet pipe, respectively at the top of main combustion chamber and subsidiary combustion chamber.Lower secondary air channel is connected with lower secondary air box, and upper secondary air channel is connected with overhead central secondary wind jet pipe and overhead curtain Secondary Air jet pipe respectively；Air-introduced machine exiting flue gas house steward is provided with and is recirculated back to burning fume house steward；Flue gas house steward of strile-bacing is connected with primary air fan entrance airduct and overfire air fan entrance airduct respectively.Strile-back and First air is provided between flue gas house steward and primary air fan entrance airduct strile-backs smoke valve；Strile-back and Secondary Air is provided between flue gas house steward and overfire air fan entrance airduct strile-backs smoke valve.The present invention has the advantages that high combustion efficiency, NOx generation amount be low, boiler operatiopn is reliable.
Description
Technical field
Crouched the present invention relates to a kind of CFBC equipment, more particularly to the low NOx of multipaths that a kind of flue gas strile-backs
Formula CFBC equipment, belongs to the solids such as coal, solid waste, city and industrial sludge, the biomass of low emission
The combustion apparatus of fuel, is particularly suitable for the ciculation fluidized burning of the solid fuel of the ultralow NOx raw emissions of requirement.
Background technology
The primary combustion equipment of the solid fuels such as current China domestic coal, solid waste, sludge, biomass is chain
Bar oven, water-cooling vibration furnace grate boiler and CFBB etc., the different type of furnaces, different stoves are selected according to different fuel
The characteristics of type has respective.
CFBB is the combustion technology of high-efficiency cleaning developed in recent years, and fuel tolerance is wide, flammable
With fuel such as fat coal, colm, solid waste, biomass.Due to its high combustion efficiency, can carry out simultaneously desulfuration in furnace,
The contamination controls such as denitration are operated, and have the advantages that low NOx and SOx are discharged, thus have obtained rapid development in electricity market, just
Develop to maximization direction, 600MWe CFBB has been put into commercial operation.Meanwhile, in Industrial Boiler field,
Because the evaporation capacity of Industrial Boiler is small, flexible operation, maintenance convenience, fuel such as colm, solid waste, biomass etc. is increasingly
Favored, these fuel are especially suitable for using circulating fluidized bed technique burning.Traditional vertical, single-stage circulation fluidized-bed combustion boiler are deposited
High, the shortcomings of boiler island is bulky in shaft, requires higher to workshop building.While the supporting steel frame and boiler of boiler island
The steel consumption of island body is larger so that Project Cost and initial cost are higher.Led for vertical circulation fluidized-bed combustion boiler in Industrial Boiler
The defect in domain, Chinese patent CN1786565A discloses a kind of Horizontal type circulating fluid bed combustion apparatus and its circulating combustion method,
It is divided into three parts using external separator, by the burner hearth of traditional vertical boiler, so as to effectively reduce furnace height.However,
The patent that CN1786565A is announced in terms of low NOx combustion, does not have substantially poor in stove with traditional vertical circulation fluidized-bed combustion boiler
It is different, for solid fuel, it is extremely difficult to the Industrial Boiler emission request of harshness（For example, NOx emission is less than 200 mg/Nm3Even
It is required that lower）.In addition, the recycle stock for entering subsidiary combustion chamber from main combustion chamber is easy to being flushed on the water-cooling wall of opposite, also it is easily caused
Abrasion.
In traditional recirculating fluidized bed field, NOx emission, i.e. fuel combustion can be typically reduced by Researched of Air Staging Combustion Burning Pulverized Coal
Required air is supplied stage by stage, and First air is supplied by air compartment, but primary air flow is not enough to provide fuel and burnt completely institute
The air needed, air of the fuel completely required for burning is supplied by Secondary Air or tertiary air again, empty by this classification supply
The mode of gas builds the reducing atmosphere of combustion zone, so that the NOx for generation of burning is reduced into N2, reduce NOx emission.Mesh
Before, the mode of this Researched of Air Staging Combustion Burning Pulverized Coal has reached bottleneck to NOx emission reduction effect.Flue gas for superheater temperature adjustment is again
Round-robin method can equally strengthen the reducing atmosphere in burner hearth, and reduce the temperature levels in burner hearth, be conducive to low NOx drainage.
Meanwhile, fluidized-bed combustion boiler is low due to ignition temperature, still also has uncombusted trace amounts of CO, CH in flue gas4Deng fuel gas, pass through cigarette
Gas recycling is strile-backd and can improve efficiency of combustion.Researched of Air Staging Combustion Burning Pulverized Coal and flue gas, which strile-back, to be combined, and further depth can reduce NOx
Discharge and the efficiency of combustion of boiler.Meanwhile, by rationally setting air supply position, burning Indoor Flow Field can be regulated and controled, can also be dropped
It is low to wash away and wear and tear.
The content of the invention
In view of the shortcomings of the prior art and defect, the present invention is based on existing Horizontal type circulating fluid bed Industrial Boiler skill
Art, proposes the low NOx Horizontal CFB Boilers of multipaths that a kind of flue gas strile-backs, while structure characteristics of compact layout, fully
The characteristics of Horizontal CFB Boiler point bed burns is make use of, on the basis of staged air distribution mode is retained, using flue gas again
Circulation is strile-backd, and makes to reduce NOx emission while fuel combustion is abundant.
The present invention is achieved by the following technical solutions：
The low NOx Horizontal CFB Boilers of multipaths that a kind of flue gas strile-backs, including air compartment, fuel supply system, a master
Fire room, subsidiary combustion chamber, secondary furnace, separator, material returning device, secondary material returning device, connection flue, back-end ductwork and heating surface；Institute
State main combustion chamber, subsidiary combustion chamber and secondary furnace to be surrounded by water-cooling wall, partition wall water cooling before being disposed between the main combustion chamber and subsidiary combustion chamber
Wall, partition wall water-cooling wall after being disposed between the subsidiary combustion chamber and secondary furnace, in the top layout of the main combustion chamber and subsidiary combustion chamber
There is ceiling；Deduster is arranged after the back-end ductwork and heating surface, the deduster is connected by air-introduced machine with chimney, it is special
Levy and be：
The boiler also includes primary air fan and overfire air fan；The primary air fan port of export is connected with an air compartment, institute
State primary air fan entrance point and be provided with First air air intake；Pass through First air between primary air fan and the First air air intake
Machine entrance airduct is connected；The overfire air fan entrance point is provided with secondary air entrance；The overfire air fan is empty with Secondary Air
Connected between gas entrance by overfire air fan entrance airduct；The overfire air fan outlet sets Secondary Air house steward；The main combustion chamber side
Lower overfire air port, the lower Secondary Air spray are provided with below the water-cooling wall formation main combustion chamber side wall in face, the main combustion chamber side wall
Mouth bottom is provided with lower secondary air box；The ceiling is provided with overhead central secondary wind jet pipe and overhead curtain Secondary Air jet pipe, institute
Overhead central secondary wind jet pipe and overhead curtain Secondary Air jet pipe is stated respectively to be located at the top of main combustion chamber and subsidiary combustion chamber；
The Secondary Air house steward outlet is connected to lower secondary air channel and upper secondary air channel, and the lower secondary air channel is secondary with
Bellows are connected, and the upper secondary air channel is connected with the overhead central secondary wind jet pipe and overhead curtain Secondary Air jet pipe respectively；
It is provided with air-introduced machine exiting flue gas house steward between the air-introduced machine and chimney to be connected, on the air-introduced machine exiting flue gas house steward
Provided with flue gas house steward of strile-bacing；The flue gas house steward of strile-bacing connects with primary air fan entrance airduct and overfire air fan entrance airduct respectively
Connect.
In above-mentioned technical proposal, described strile-back is provided with First air between flue gas house steward and primary air fan entrance airduct and strile-backd
Smoke valve；Described strile-back is provided with Secondary Air and strile-backd smoke valve between flue gas house steward and overfire air fan entrance airduct.
In above-mentioned technical proposal, First air house steward is provided between the primary air fan and an air compartment；The First air
House steward is connected with a material returning device, secondary material returning device by feed back airduct；The First air house steward is connected with an air compartment
There is bottom to put primary air piping.
In above-mentioned technical proposal, the lower overfire air port sets overfire air port under two groups, every group to include several simultaneously
Join overfire air port bottom under the lower overfire air port of arrangement, every group and one lower secondary air box is set；Overfire air port under two groups
It is symmetricly set on the main combustion chamber side wall on the main combustion chamber both sides；The lower overfire air port longitudinal center line and main combustion chamber side wall
Angle α is 75~85 °.
In above-mentioned technical proposal, the overhead central secondary wind jet pipe is located at the center at the top of the main combustion chamber；The top
Put the average flow velocity v of central secondary wind nozzle exit3>5m/s。
In above-mentioned technical proposal, the top of the preceding partition wall water-cooling wall is h, the overhead with the vertical range of the ceiling
The air line distance of curtain Secondary Air jet pipe center and the preceding partition wall water-cooling wall is s1, the heat smoke of subsidiary combustion chamber is entered from main combustion chamber
Density with recycle stock mixture is ρ1, speed be v1, flue gas and the recycle stock mixture is relative to preceding partition wall water-cooling wall
The average spinning momentum square J on top1=0.5·ρ1·v1·h；The density of air-flow sprayed from overhead curtain Secondary Air jet pipe is
ρ2, speed be v2, spinning momentum square J of the air-flow relative to preceding partition wall water-cooling wall top2=ρ2·v2·s1；J2And J1Relation
For J2≥J1。
In above-mentioned technical proposal, by primary air fan feed boiler air capacity account for burning always need air capacity 40% ~
60%。
In above-mentioned technical proposal, the flue gas mark that strile-backs of primary air fan entrance airduct is entered by the First air smoke valve that strile-backs
The ratio of air mark condition volume flow of the condition volume flow with entering primary air fan entrance airduct by First air air intake
For 0 ~ 0.25.By Secondary Air strile-back smoke valve enter overfire air fan entrance airduct strile-back flue gas mark condition volume flow with it is logical
The ratio for crossing the air mark condition volume flow that secondary air entrance enters primary air fan entrance airduct is 0 ~ 0.20.
The present invention compared with prior art, with advantages below and high-lighting effect：1. the present invention uses Horizontal type cloth
Put, the height of boiler can be substantially reduced, boiler steel consumption is saved, so as to significantly reduce boiler cost.Simultaneously because boiler is high
After degree reduction, the construction cost of boiler factory building can be greatly lowered.After boiler height reduction, the stability of boiler is good, can make pot
Stove and mill construction are compacter, also allow for repair and maintenance.2. the present invention is strile-backd technology using Researched of Air Staging Combustion Burning Pulverized Coal and flue gas, can
Efficiency of combustion is improved, because temperature levels are uniform in burner hearth and oxygen content is low, thus NOx generation amount is low, the original NOx rows of boiler
Put less than 100mg/Nm3.3. material returning device is fluidized using partial recirculation flue gas, and the part of residual carbon in material returning device can be avoided strong
Burn and cause material returning device coking, improve the reliability of boiler operatiopn.4. curtain wind is set at the top of subsidiary combustion chamber, gas-solid is changed
Flow field, is reduced because of the abrasion caused by centrifugal action to partition wall water-cooling wall after subsidiary combustion chamber.
Brief description of the drawings
Fig. 1 is the structure for the low NOx Horizontal CFB Boilers of multipaths that a kind of flue gas involved in the present invention strile-backs
Schematic diagram.
Fig. 2 is the main combustion for the low NOx Horizontal CFB Boilers of multipaths that a kind of flue gas involved in the present invention strile-backs
Room B-B sectional views.
Fig. 3 is a kind of A of the low NOx Horizontal CFB Boilers of multipaths that strile-backs of flue gas involved in the present invention to top
Canopy view.
Fig. 4 is the overhead for the low NOx Horizontal CFB Boilers of multipaths that a kind of flue gas involved in the present invention strile-backs
Curtain Secondary Air and flow field schematic diagram.
Fig. 5 is the overhead for the low NOx Horizontal CFB Boilers of multipaths that a kind of flue gas involved in the present invention strile-backs
Central secondary wind and flow field schematic diagram.
In figure：Air compartment of 1-；Secondary air box under 2-；3- fuel supply systems；Overfire air port under 4-；5- water
Cold wall；6- main combustion chambers；7- subsidiary combustion chambers；8- overhead central secondary wind jet pipes；9- overhead curtain Secondary Air jet pipes；10- after-flames
Room；11- separators；12- connection flues；13- back-end ductworks and heating surface；14- dedusters；15- air-introduced machines；16- cigarettes
Chimney；17- Secondary Airs strile-back smoke valve；18- secondary air entrances；19- First air air intakes；20- First airs strile-back
Smoke valve；21- primary air fans；22- overfire air fans；Bis- material returning devices of 23-；Material returning device of 24-；30- air-introduced machines are exported
Flue gas house steward；31- strile-backs flue gas house steward；32- primary air fan entrance airducts；33- overfire air fan entrance airducts；34- bis- times
Wind house steward；35- First air house stewards；36- feed back airducts；37- puts primary air piping in bottom；Secondary air channel under 38-；39- is upper secondary
Airduct；Partition wall water-cooling wall before 40-；Partition wall water-cooling wall after 41-；50- main combustion chamber side walls；51- ceilings.
Embodiment
The embodiment and the course of work to the present invention are further described below in conjunction with the accompanying drawings.
The orientation such as upper and lower, left and right, front and rear in present specification term is based on position relationship shown in the drawings
Set up.Accompanying drawing is different, then corresponding position relationship is also possible to change therewith, therefore can not be interpreted as with this to protection model
The restriction enclosed.
As shown in figure 1, the low NOx Horizontal CFB Boilers of multipaths that a kind of flue gas strile-backs, including air compartment 1,
Fuel supply system 3, main combustion chamber 6, subsidiary combustion chamber 7, secondary furnace 10, separator 11, material returning device 24, secondary material returning device 23, a company
Cigarette receiving road 12, back-end ductwork and heating surface 13.The main combustion chamber 6, subsidiary combustion chamber 7 and secondary furnace 10 are surrounded by water-cooling wall 5, the master
Combustion room 6, subsidiary combustion chamber 7 and secondary furnace 10 are arranged in juxtaposition, partition wall water-cooling wall before being disposed between the main combustion chamber 6 and subsidiary combustion chamber 7
40, partition wall water-cooling wall 41 after being disposed between the subsidiary combustion chamber 7 and secondary furnace 10.With main combustion chamber 6, subsidiary combustion chamber 7 and secondary furnace
10 directions being arranged in juxtaposition are front and rear, and non-touching direction is left and right side between main combustion chamber 6, subsidiary combustion chamber 7 and secondary furnace 10.
The water-cooling wall formation main combustion chamber side wall 50 of the side of main combustion chamber 6, the lower section of main combustion chamber side wall 50 is provided with lower Secondary Air spray
Mouth 4, the lower bottom of overfire air port 4 is provided with lower secondary air box 2.As shown in Fig. 2 a kind of embodiment is, lower Secondary Air spray
Mouth 4 sets overfire air port under two groups, every group to include Secondary Air spray under several lower overfire air ports 4 being arranged in parallel, every group
Mouth bottom sets a lower secondary air box 2.Overfire air port 4 and corresponding two lower secondary air box 2 are respectively symmetrically set under two groups
Put the main combustion chamber side wall 50 in the main combustion chamber left and right sides.The longitudinal center line of overfire air port 4 and the lower Secondary Air under each
The angle α of main combustion chamber side wall 50 where spout 4 is 75~85 °.
The top layout of the main combustion chamber 6 and subsidiary combustion chamber 7 has ceiling 51, and the ceiling 51 is provided with overhead central secondary wind
Jet pipe 8 and overhead curtain Secondary Air jet pipe 9, overhead central secondary wind jet pipe 8 and overhead curtain the Secondary Air jet pipe 9 distinguish position
In main combustion chamber 6 and the top of subsidiary combustion chamber 7.As shown in figure 3, the overhead central secondary wind jet pipe 8 is located at the top of main combustion chamber 6
Center；The average flow velocity v that the overhead central secondary wind jet pipe 8 is exported3>5m/s。
Deduster 14 is arranged after the back-end ductwork and heating surface 13, the deduster 14 passes through air-introduced machine 15 and chimney
16 are connected.
The boiler also includes primary air fan 21 and overfire air fan 22.The port of export of primary air fan 21 and the First air
Room 1 is connected, and the entrance point of primary air fan 21 is provided with First air air intake 19；The primary air fan 21 and First air air
Connected between entrance 19 by primary air fan entrance airduct 32.First air is provided between the primary air fan 21 and an air compartment 1
House steward 35；The First air house steward 35 is connected with a material returning device 24, secondary material returning device 23 by feed back airduct 36；It is described
First air house steward 35 and an air compartment 1 are connected with bottom and put primary air piping 37.
The entrance point of overfire air fan 22 is provided with secondary air entrance 18；The overfire air fan 22 and secondary air
Connected between entrance 18 by overfire air fan entrance airduct 33.The outlet of overfire air fan 22 sets Secondary Air house steward 34.Described two
The secondary outlet of wind house steward 34 is connected to lower secondary air channel 38 and upper secondary air channel 39, the lower secondary air channel 38 and lower Secondary Air
Case 2 be connected, the upper secondary air channel 39 respectively with the overhead central secondary wind jet pipe 8 and the phase of overhead curtain Secondary Air jet pipe 9
Even.
Air-introduced machine exiting flue gas house steward 30 is provided between the air-introduced machine 15 and chimney 16 to be connected, the air-introduced machine outlet
Flue gas house steward 30 is provided with flue gas house steward 31 of strile-bacing；It is described strile-back flue gas house steward 31 respectively with primary air fan entrance airduct 32 and two
Secondary fans entrance airduct 33 is connected.
Described strile-back is provided with First air and strile-backd smoke valve 20 between flue gas house steward 31 and primary air fan entrance airduct 32；Institute
State to strile-back and Secondary Air is provided between flue gas house steward 31 and overfire air fan entrance airduct 33 strile-backs smoke valve 17.
As shown in figure 4, the vertical range of the top of the preceding partition wall water-cooling wall 40 and the ceiling 51 is h, the overhead
The air line distance of the center of curtain Secondary Air jet pipe 9 and the preceding partition wall water-cooling wall 40 is s1, enter subsidiary combustion chamber 7 from main combustion chamber 6
The density of heat smoke and recycle stock mixture isρ 1 , speed be v1, so described heat smoke and recycle stock mixture relative to
The average spinning momentum square J on the preceding top of partition wall water-cooling wall 401=0.5·ρ 1 ·v1·h；Sprayed from overhead curtain Secondary Air jet pipe 9
The density of air-flow beρ 2 , speed be v2, spinning momentum square J of the air-flow relative to the preceding top of partition wall water-cooling wall 402=ρ 2 ·
v2·s1；Both relations are J2≥J1。
The air capacity of the infeed boiler of primary air fan 21, which accounts for burning, always needs the 40% ~ 60% of air capacity.
The flue gas mark condition volume flow of strile-bacing of primary air fan entrance airduct 32 is entered by the First air smoke valve 20 that strile-backs
With entered by First air air intake 19 primary air fan entrance airduct 32 air mark condition volume flow ratio for 0 ~
0.25。
The flue gas mark condition volume flow of strile-bacing of overfire air fan entrance airduct 33 is entered by the Secondary Air smoke valve 17 that strile-backs
With entered by secondary air entrance 19 primary air fan entrance airduct 33 air mark condition volume flow ratio for 0 ~
0.20。
Fuel feeds the boiler by fuel supply system 3, and fuel is mixed with the First air fed by an air compartment 1
Burning, the flue gas produced after burning contains a large amount of unburned gas, and the flue gas containing unburned gas sprays in main combustion chamber 6 with lower Secondary Air
The Secondary Air mixed combustion that mouthfuls 4 Secondary Airs sprayed into, overhead central secondary wind jet pipe 8 are sprayed into, then in subsidiary combustion chamber 7 and overhead
The Secondary Air mixing that curtain Secondary Air jet pipe 9 is sprayed into, further burning.Then, flue gas is through back-end ductwork and heating surface 13, dedusting
Device 14 enters air-introduced machine 15.Flue-gas temperature into air-introduced machine 15 between 100 ~ 160 DEG C, and may containing it is minimal amount of not
Combustion gas body CO, CH4、H2Deng（For example, 110ppm CO, 8ppm CH4）.The partial fume that air-introduced machine 15 is exported is through the flue gas that strile-backs
House steward 31 is respectively allocated to primary air fan entrance airduct 32 and overfire air fan entrance airduct 33, and then is mixed with air, air and
Strile-back flue gas mixed gas as the First air and Secondary Air of boiler, First air feeds from an air compartment 1, Secondary Air respectively from
Lower overfire air port 4, overhead central secondary wind jet pipe 8, curtain Secondary Air jet pipe 9 are fed.Strile-back flue gas in First air, Secondary Air
Ratio according to fuel type, load and ignition temperature level determine.When boiler is in higher load condition, fire box temperature water
The ratio of the flue gas that strile-backs in flat height, First air, Secondary Air can be high.It is intrinsic in burner hearth when the volatile matter content of fuel is high
When the reproducibility of fuel carbon particle is weak, flue gas ratio of strile-bacing can be properly increased.Secondary material returning device 23 and a material returning device 24 are used
Partial recirculation flue gas is fluidized, and can be avoided the local active combustion of residual carbon in material returning device and be caused material returning device coking, improve
The reliability of boiler operatiopn.
Instantly when the Secondary Air penetration depth that overfire air port 4 sprays is weaker, it can increase in overhead central secondary wind jet pipe 8
The secondary air ratio of ejection.As shown in figure 5, because the center of overhead central secondary wind jet pipe 8 and the vertical centre to main combustion chamber 6
Overlap, so Secondary Air can be fed directly into the center of burner hearth herein, be conducive to the mixing of air and fuel, overheavy firing and biography
Heat.
The Secondary Air that curtain Secondary Air jet pipe 9 sprays can change the stream of Dual-Phrase Distribution of Gas olid in from main burning 6 to subsidiary combustion chamber 7
To.When not arranging curtain Secondary Air jet pipe 9, Gas-particle Flows the washing away to rear partition wall water-cooling wall 41 in main combustion chamber to subsidiary combustion chamber
Seriously, when using curtain Secondary Air, it will can be pressed downward turning back from the heat smoke fixed double phase flow of main combustion chamber directive subsidiary combustion chamber, so that
Reduction abrasion.
One of embodiment：
The average flow velocity v exported for certain boiler, overhead central secondary wind jet pipe 83=6m/s, more than fluidising air velocity
（4.5m/s）, can so make mixing in main combustion chamber strong.The angle α of the lower longitudinal center line of overfire air port 4 and the side wall of subsidiary combustion chamber 7
For 80 °, the Secondary Air air-flow at this sprays obliquely, interlocks with Dual-Phrase Distribution of Gas olid heat smoke formation in the main combustion chamber that flows up
Mixing, is conducive to strengthening interior circulation.Enter the heat smoke of subsidiary combustion chamber 7 relative to the preceding top of partition wall water-cooling wall 40 from main combustion chamber 6
Average spinning momentum square J1, moved from the rotation relative to the preceding top of partition wall water-cooling wall 40 of the ejection of overhead curtain Secondary Air jet pipe 9
Measure square J2, J2/J1Adjustable in the range of=1.0 ~ 1.5, the spinning momentum intensity of Secondary Air is higher than the rotation of Dual-Phrase Distribution of Gas olid heat smoke
Momentum, thus jet direction is varied so that the downward Uniform Flow of gas-particle two-phase in subsidiary combustion chamber.According to fuel characteristic, once
The air capacity that blower fan 21 is fed, which accounts for burning, always needs the 55% of air capacity；First air is entered by the First air smoke valve 20 that strile-backs
The flue gas mark condition volume flow of strile-bacing of machine entrance airduct 32 enters one's intention as revealed in what one says with entering primary air fan by First air air intake 19
The ratio of the air mark condition volume flow of pipe 32 is 0.1；Enter overfire air fan by the Secondary Air smoke valve 17 that strile-backs and enter one's intention as revealed in what one says
Sky of the flue gas mark condition volume flow of strile-bacing of pipe 33 with entering primary air fan entrance airduct 33 by secondary air entrance 19
The ratio of gas mark condition volume flow is 0.15.
Due to being strile-backd present invention employs flue gas recirculation, in burner hearth, temperature levels are low, uniform temperature fields, flue gas oxygen content
It is low, thus NOx generation amount is low, when fuel is suitable, the original NOx emission of boiler is smaller than 50mg/Nm3, without SNCR or
SCR is that minimum discharge can be achieved.Curtain wind is set at the top of subsidiary combustion chamber, gas-solid flow field is changed, reduces and led because of centrifugal action
The abrasion to partition wall water-cooling wall after subsidiary combustion chamber caused.The Environmental Protection Level and availability of boiler are increased substantially.
Claims (9)
1. the low NOx Horizontal CFB Boilers of multipaths that a kind of flue gas strile-backs, including an air compartment（1）, fuel supply dress
Put（3）, main combustion chamber（6）, subsidiary combustion chamber（7）, secondary furnace（10）, separator（11）, a material returning device（24）, secondary material returning device
（23）, connection flue（12）, back-end ductwork and heating surface（13）；The main combustion chamber（6）, subsidiary combustion chamber（7）And secondary furnace（10）By
Water-cooling wall（5）Surround, in the main combustion chamber（6）And subsidiary combustion chamber（7）Between be disposed with before partition wall water-cooling wall（40）, in the secondary combustion
Room（7）And secondary furnace（10）Between be disposed with rear partition wall water-cooling wall（41）, in the main combustion chamber（6）And subsidiary combustion chamber（7）Top
It is disposed with ceiling（51）；In the back-end ductwork and heating surface（13）After arrange deduster（14）, the deduster（14）Pass through
Air-introduced machine（15）With chimney（16）It is connected, it is characterised in that：
The boiler also includes primary air fan（21）And overfire air fan（22）；The primary air fan（21）The port of export with it is described once
Air compartment（1）It is connected, the primary air fan（21）Entrance point is provided with First air air intake（19）；The primary air fan（21）With
The First air air intake（19）Between pass through primary air fan entrance airduct（32）Connection；The overfire air fan（22）Entrance point is set
It is equipped with secondary air entrance（18）；The overfire air fan（22）With the secondary air entrance（18）Between pass through overfire air fan
Entrance airduct（33）Connection；The overfire air fan（22）Outlet sets Secondary Air house steward（34）；The main combustion chamber（6）The water of side
Cold wall formation main combustion chamber side wall（50）, the main combustion chamber side wall（50）Lower section is provided with lower overfire air port（4）, it is described under it is secondary
Wind snout（4）Bottom is provided with lower secondary air box（2）；The ceiling（51）It is provided with overhead central secondary wind jet pipe（8）And overhead
Curtain Secondary Air jet pipe（9）, the overhead central secondary wind jet pipe（8）With overhead curtain Secondary Air jet pipe（9）It is located at master respectively
Fire room（6）And subsidiary combustion chamber（7）Top；
The Secondary Air house steward（34）Outlet is connected to lower secondary air channel（38）With upper secondary air channel（39）, it is described under it is secondary
Airduct（38）With lower secondary air box（2）It is connected, the upper secondary air channel（39）Respectively with the overhead central secondary wind jet pipe（8）
With overhead curtain Secondary Air jet pipe（9）It is connected；
The air-introduced machine（15）With the chimney（16）Between be provided with air-introduced machine exiting flue gas house steward（30）, the air-introduced machine goes out
Mouth flue gas house steward（30）Provided with flue gas house steward of strile-bacing（31）；The flue gas house steward of strile-bacing（31）Enter one's intention as revealed in what one says with primary air fan respectively
Pipe（32）With overfire air fan entrance airduct（33）Connection.
2. the low NOx Horizontal CFB Boilers of multipaths strile-backd according to a kind of flue gas described in claim 1, its feature exists
In：The flue gas house steward of strile-bacing（31）With the primary air fan entrance airduct（32）Between be provided with First air and strile-back smoke valve
（20）；The flue gas house steward of strile-bacing（31）With the overfire air fan entrance airduct（33）Between be provided with Secondary Air and strile-back smoke valve
（17）.
3. the low NOx Horizontal CFB Boilers of multipaths strile-backd according to a kind of flue gas described in claim 1, its feature exists
In：The primary air fan（21）With an air compartment（1）Between be provided with First air house steward（35）；The First air house steward
（35）With a material returning device（24）, secondary material returning device（23）Pass through feed back airduct（36）Connection；The First air house steward
（35）With an air compartment（1）It is connected with bottom and puts primary air piping（37）.
4. the low NOx Horizontal CFB Boilers of multipaths strile-backd according to a kind of flue gas described in claim 1, its feature exists
In：The lower overfire air port（4）Overfire air port under two groups, every group is set to include several lower overfire air ports（4）, every group
Lower overfire air port bottom sets a lower secondary air box（2）；Overfire air port under two groups（4）It is symmetricly set on the main combustion chamber
（7）The main combustion chamber side wall on both sides（50）；The lower overfire air port（4）Longitudinal center line and main combustion chamber side wall（50）Angle α
For 75~85 °.
5. the low NOx Horizontal CFB Boilers of multipaths strile-backd according to a kind of flue gas described in claim 1, its feature exists
In：The overhead central secondary wind jet pipe（8）Positioned at the main combustion chamber（6）The center at top；The overhead central secondary wind spray
Pipe（8）The average flow velocity v of outlet3>5m/s。
6. the low NOx Horizontal CFB Boilers of multipaths strile-backd according to a kind of flue gas described in claim 1, its feature exists
In：The preceding partition wall water-cooling wall（40）Top and the ceiling（51）Vertical range be h, overhead curtain Secondary Air spray
Pipe（9）Center and the preceding partition wall water-cooling wall（40）Air line distance be s1, from main combustion chamber（6）Into subsidiary combustion chamber（7）Hot cigarette
The density of gas and recycle stock mixture isρ 1 , speed be v1, heat smoke and the recycle stock mixture is relative to preceding partition wall water
Cold wall（40）The average spinning momentum square J on top1=0.5·ρ 1 ·v1·h；From overhead curtain Secondary Air jet pipe（9）The gas of ejection
The density of stream isρ 2 , speed be v2, the air-flow is relative to preceding partition wall water-cooling wall（40）The spinning momentum square J on top2=ρ 2 ·v2·
s1；J2≥J1。
7. the low NOx Horizontal CFB Boilers of multipaths strile-backd according to a kind of flue gas described in claim 1, its feature exists
In：Pass through the primary air fan（21）Feed the boiler air capacity account for burning always need the 40% ~ 60% of air capacity.
8. the low NOx Horizontal CFB Boilers of multipaths strile-backd according to a kind of flue gas described in claim 1 or 2, it is special
Levy and be：Strile-backd smoke valve by the First air（20）Enter primary air fan entrance airduct（32）The flue gas mark condition body that strile-backs
Product flow is with passing through First air air intake（19）Enter primary air fan entrance airduct（32）Air mark condition volume flow
Ratio is 0 ~ 0.25.
9. the low NOx Horizontal CFB Boilers of multipaths strile-backd according to a kind of flue gas described in claim 1 or 2, it is special
Levy and be：Strile-backd smoke valve by Secondary Air（17）Enter overfire air fan entrance airduct（33）The flue gas mark condition volume flow that strile-backs
Amount is with passing through secondary air entrance（19）Enter primary air fan entrance airduct（33）Air mark condition volume flow ratio
For 0 ~ 0.20.
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| CN111207386A (en) * | 2020-01-16 | 2020-05-29 | 吉林宏日新能源股份有限公司 | Low-nitrogen biomass combustion method and biomass hot blast stove |
| CN111550820A (en) * | 2020-05-25 | 2020-08-18 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Boiler over-fire air adjusting method based on power moment |
| CN111561707A (en) * | 2020-06-03 | 2020-08-21 | 国网浙江省电力有限公司电力科学研究院 | Low-load NO of thermal power generating unitXCombustion optimization method and system |
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| CN111207386A (en) * | 2020-01-16 | 2020-05-29 | 吉林宏日新能源股份有限公司 | Low-nitrogen biomass combustion method and biomass hot blast stove |
| CN111550820A (en) * | 2020-05-25 | 2020-08-18 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Boiler over-fire air adjusting method based on power moment |
| CN111561707A (en) * | 2020-06-03 | 2020-08-21 | 国网浙江省电力有限公司电力科学研究院 | Low-load NO of thermal power generating unitXCombustion optimization method and system |
| CN111561707B (en) * | 2020-06-03 | 2022-05-27 | 国网浙江省电力有限公司电力科学研究院 | Low-load NO of thermal power generating unitXCombustion optimization method and system |
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