CN106838892A - A kind of energy-efficient Circulating Fluidized Bed Boiler of low nitrogen - Google Patents
A kind of energy-efficient Circulating Fluidized Bed Boiler of low nitrogen Download PDFInfo
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- CN106838892A CN106838892A CN201710081042.6A CN201710081042A CN106838892A CN 106838892 A CN106838892 A CN 106838892A CN 201710081042 A CN201710081042 A CN 201710081042A CN 106838892 A CN106838892 A CN 106838892A
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- air
- burner hearth
- coal
- fluidized bed
- energy
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 18
- 239000003245 coal Substances 0.000 claims abstract description 63
- 239000000463 material Substances 0.000 claims abstract description 27
- 239000004744 fabric Substances 0.000 claims abstract description 9
- 230000035558 fertility Effects 0.000 claims abstract description 7
- 238000004891 communication Methods 0.000 claims abstract description 3
- 235000017274 Diospyros sandwicensis Nutrition 0.000 claims description 6
- 241000282838 Lama Species 0.000 claims description 6
- 239000003546 flue gas Substances 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 5
- 230000008676 import Effects 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000000356 contaminant Substances 0.000 abstract description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 230000003134 recirculating effect Effects 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 239000003500 flue dust Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 206010021143 Hypoxia Diseases 0.000 description 2
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 2
- 235000011613 Pinus brutia Nutrition 0.000 description 2
- 241000018646 Pinus brutia Species 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 208000018875 hypoxemia Diseases 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- 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
-
- 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
- F23C10/20—Inlets for fluidisation air, e.g. grids; Bottoms
-
- 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
- F23C10/22—Fuel feeders specially adapted for fluidised bed combustion apparatus
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention belongs to boiler plant field, the energy-efficient Circulating Fluidized Bed Boiler of specifically related to a kind of low nitrogen, its growing amount that can effectively reduce contaminant gases, boiler efficiency is improved while reducing energy consumption, stable and reliable operation, burner hearth lower end is provided with coal supply system and a secondary air system, burner hearth upper end connects piece-rate system, piece-rate system includes separator inlet flue duct and cyclone separator, gametic fertility system in stove is provided between burner hearth and cyclone separator, separator inlet flue duct connects burner hearth, cyclone separator upper end inlet communication back-end ductwork, material return system is installed between cyclone separator lower part outlet and burner hearth lower end, superheater is provided with back-end ductwork, economizer and preheater and connection outlet flue；One secondary air system includes primary air system and secondary air system, and primary air system includes First air air inlet structure and subregion cloth wind structure, and a secondary air system is the double-decker of the upper and lower, and First air and Secondary Air ratio are 1:1.
Description
Technical field
The invention belongs to boiler plant field, and in particular to a kind of energy-efficient HTHP recirculating fluidized bed pot of low nitrogen
Stove.
Background technology
Coal is the main energy sources of China, and its main Land use systems is coal fired power generation, the N0 that coal combustion is producedx、S02And flue dust
Deng pollutant severe contamination air, and N0x、S02It is the main source to form the pollutions such as acid rain, photochemical fog.As China passes through
The fast development of Ji, pollutant emission is more serious, and greatly puzzlement is brought to people's lives.Therefore, controlled from source
N0 in flue gasx、S02And the discharge of flue dust is extremely urgent.
Combustion technology of circulating fluidized is greatly developed for nearly 30 years with its energy-conserving and environment-protective advantage.In September, 2014,
National Development and Reform Committee, Chinese Ministry of Environmental Protection and ministries and commissions of National Energy Board three combine and issue《Coal electricity energy-saving and emission-reduction upgrading and transformation action plan
（2014-the year two thousand twenty）》, it is desirable to newly-built coal unit nearly or substantially reaches discharge of gas turbine limit value, i.e., in benchmark oxygen content
In the case of 6%, N0x、S02And flue dust respectively reach 50,35,10mg/m3, this enables that low-temperature burning effectively suppresses nitrogen oxides
Generation and stove combustion process can the CFBB of direct desulfurization also have much pressure.
Domestic existing Properties of CFB, due to coal type change is big and Secondary Air proportioning regulation is unreasonable etc. because
Element, causes the CFB boiler N0 of many power plantxConcentration of emission more than 300mg/m3, it is necessary to install SNCR+SCR denitrating systems, this meeting
The operating cost and the transformation cycle that dramatically increase enterprise be long, investment of equipment is very big.
Therefore, in order to solve the above technical problems, combustion characteristics it is necessory to adjust boiler, reduces pollutant from source
The growing amount of gas, in this context, the present invention proposes a kind of energy-efficient HTHP recirculating fluidized bed of low nitrogen
Boiler.
The content of the invention
In order to solve the above problems, the invention provides a kind of energy-efficient HTHP recirculating fluidized bed pot of low nitrogen
Stove, its growing amount that can effectively reduce contaminant gases improves boiler efficiency, stable and reliable operation while reducing energy consumption.
Its technical scheme is such：A kind of energy-efficient Circulating Fluidized Bed Boiler of low nitrogen, its feature exists
In it includes burner hearth, and the burner hearth lower end is provided with coal supply system and a secondary air system, and the burner hearth upper end connects segregative line
System, the piece-rate system includes separator inlet flue duct and cyclone separator, is set between the burner hearth and the cyclone separator
Gametic fertility system in stove is equipped with, the separator inlet flue duct connects the burner hearth, and cyclone separator upper end import connects
Logical back-end ductwork, is provided with material return system, the afterbody cigarette between the cyclone separator lower part outlet and the burner hearth lower end
Superheater, economizer and preheater and connection outlet flue are provided with road；One secondary air system includes primary air system
And secondary air system, the primary air system include First air air inlet structure and subregion cloth wind structure, the First air air intake knot
Structure includes multiple lama's mouth structures, and lama's mouth structure is arranged in the rear wall of the burner hearth, and the subregion cloth wind structure is specific
For the percent opening at the burner hearth surrounding and slag dropping tube is more than other regions, the secondary air system is double for the upper and lower
Rotating fields, First air and Secondary Air ratio are 1:1.
It is further characterized by, and the coal supply system includes the coal spout being in tilted layout, and the coal spout upper end is installed
There is adapter, the adapter upper end connects feeder, and the adapter bottom is provided with send corresponding with the coal spout incline direction
Coal airduct, the coal breakage bottom of the tube is provided with coal spread wind pipe and connects the burner hearth by coal breakage plate.
The adapter upper end connects the feeder by expansion joint, and feed hopper is provided with the feeder；
The adapter is vertically arranged, and the coal spout is 150 ° with the angle of the adapter, and the coal breakage plate is in tilted layout and is
Steel plate, the coal spread wind pipe incline direction is consistent with the coal breakage plate；
The narrow rectangular tubes of coal spread wind Guan Weibian, are highly 30mm, and the coal spout is provided with wear-resistant block with the adapter junction,
Wear-resistant castable is filled with the wear-resistant block；
The lower floor accounts for 15%, and apart from air distribution plate 2.5-2.7m, the upper strata is apart from the air distribution plate 4.5-5.5m for the lower floor；
The scroll-case type vapor-cooling cyclonic separator that the cyclone separator has a down dip for import, the central tube of the cyclone separator is eccentric
Set；
The separator inlet flue duct is plane and, inner side tangent with the cyclone separator along the lateral wall in flow of flue gas direction
Wall is three sections of folding faces, and the folding face and the angle of the lateral wall being connected with the burner hearth are 35 ° ± 10 °, with the whirlwind
The connected folding face of separator is parallel with the lateral wall and the distance between two faces are flue minimum widith, middle institute
It is 15 ° ± 10 ° that folding face is stated with the angle of the lateral wall, the ratio between height and flue minimum widith of the separator inlet flue duct
It is 3-5.5；
Gametic fertility system includes SNCR spray guns in the stove, and the SNCR spray guns are arranged on the burner hearth and the cyclonic separation
Between device；
The material return system include inlet ductwork, U-shaped material returning device and export pipeline, the U-shaped material returning device include returning charge bellows and
Material returning device case, the returning charge bellows include loosening air compartment, flowing air compartment and returning charge air compartment, and the flowing air compartment is arranged in the pine
Move between air compartment and the returning charge air compartment, the loosening air compartment is arranged in the cyclone separator lower end outlet side, described to return
Material air compartment is arranged in the burner hearth side, and the side wall of the loosening air compartment, flowing air compartment and returning charge air compartment is provided with air-vent, institute
State and loosen the bottom of air compartment, flowing air compartment and returning charge air compartment and be provided with ash port, the air-vent connects induced duct, it is described fall ash
Mouth connection ash tube, the returning charge bellows upper end connects air distribution plate, and the air distribution plate upper end is provided with the material returning device case, described
Material returning device blast cap through the air distribution plate is installed, the venthole of the material returning device blast cap is all located at blast cap head on air distribution plate
On.
After using boiler of the invention, using fractional combustion mode, make burner hearth bottom be stronger reducing atmosphere, prevent
It is local oxygen-enriched, while using the method for operation of sunken bed temperature, reducing N0xRaw emissions, so that N0xDischarge reaches 50-120mg/
M3, reduces an overfire air fan pressure head and returning charge fan delivery, reducing energy consumption, so that station service power consumption rate is reduced, than existing same capacity pot
Stove reduction by 30%, overall operation is reliable and stable.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention；
Fig. 2 is the structural representation of coal supply system of the present invention；
Fig. 3 is the structural representation of primary air system of the present invention；
Fig. 4 is the structural representation of secondary air system of the present invention；
Fig. 5 is the structural representation of piece-rate system of the present invention；
Fig. 6 is the top view of Fig. 5；
Fig. 7 is the structural representation of material return system of the present invention.
Specific embodiment
As shown in Fig. 1 to Fig. 7, a kind of energy-efficient Circulating Fluidized Bed Boiler of low nitrogen, it includes burner hearth 1,
The lower end of burner hearth 1 is provided with the secondary air system of coal supply system 2 and, and the upper end of burner hearth 1 connection piece-rate system 3, piece-rate system 3 includes dividing
From device inlet flue duct 23 and cyclone separator 24, gametic fertility system 4 in stove is provided between burner hearth 1 and cyclone separator 23,
Separator inlet flue duct 23 connects burner hearth 1, the upper end inlet communication back-end ductwork 5 of cyclone separator 24, the bottom of cyclone separator 23
It is provided between outlet and the lower end of burner hearth 1 in material return system 6, back-end ductwork 5 and is provided with superheater 7, economizer 8 and preheater 9
And connection outlet flue 10；One secondary air system includes primary air system 11 and secondary air system 12, and primary air system 11 includes
First air air inlet structure and subregion cloth wind structure, First air air inlet structure include multiple lama's mouth structures 13, lama's mouth structure 13
The rear wall of burner hearth 1 is arranged in, First air can be made isobaric uniform along whole bed surface, subregion cloth wind structure is specially the surrounding of burner hearth 1
It is more than other regions with the percent opening at slag dropping tube, secondary air system 12 is the double-decker of the upper and lower, First air and two
Secondary wind ratio is 1:1, it is ensured that the reducing atmosphere of bottom section, lower floor accounts for 15%, and user is easy to apart from air distribution plate 2.6m in lower floor
Become coal operation, upper strata is apart from air distribution plate 5m, and upper strata Secondary Air is higher, be 5 meters away from air distribution plate, increase whole reducing zone, it is high
Position Secondary Air can be such that coal enters after stove is heated, and fugitive constituent separates out combustion phases and is in bottom anoxic reduced zone, effectively suppresses NOx
Generation.
Coal supply system 2 includes the coal spout 15 that is in tilted layout, and the upper end of coal spout 15 is provided with and is vertically arranged and section is square
The adapter 14 of shape, the upper end of adapter 14 connects feeder 18 by expansion joint, and feed hopper 17, the bottom of adapter 14 are provided with feeder 18
Portion is provided with airduct 20 of delivering coal corresponding with the incline direction of coal spout 15, and the bottom of coal spout 15 is provided with coal spread wind pipe 16 and passes through
Coal breakage plate 22 connects burner hearth.Coal spout is 150 ° with the angle of adapter, and coal breakage plate 22 is in tilted layout and is steel plate, coal spread wind pipe 16
Incline direction is consistent with coal breakage plate 22；Coal spread wind pipe 16 is flat narrow rectangular tube, is highly 30mm, reduces coal spread wind amount, reduces oxygen
Amount input., coal spout 15 and the junction of adapter 14 are provided with and wear-resistant castable are filled with wear-resistant block 21, wear-resistant block 21.
The scroll-case type vapor-cooling cyclonic separator that cyclone separator 23 has a down dip for import, the central tube of cyclone separator 23 is eccentric
Set；Separator inlet flue duct 24 is plane and, madial wall tangent with cyclone separator 23 along the lateral wall in flow of flue gas direction
Be three sections of folding faces, the angle of the folding face being connected with burner hearth 1 and lateral wall is 35 °, the folding face being connected with cyclone separator 23 with it is outer
Side wall is parallel and the distance between two faces are flue minimum widith, and middle folding face and the angle of lateral wall is 15, separator
The ratio between height h and flue minimum widith a of inlet flue duct 24 are 4.The separator inlet flue duct 24 of the structure avoids flue gas to rotation
Washing away for the target area of wind separator 23, reduces abrasion, while increased smoke contacts area, makes burner hearth exhanst gas outlet more smooth.
Gametic fertility system 4 includes SNCR spray guns in stove, and SNCR spray guns are arranged between burner hearth 1 and cyclone separator 23；
Simple structure is effective.
Material return system 6 includes inlet ductwork 26, U-shaped material returning device 27 and export pipeline 28, and U-shaped material returning device 27 includes returning charge wind
Case 29 and material returning device case 30, returning charge bellows 29 include loosening air compartment 31, flowing air compartment 32 and returning charge air compartment 33, flow the cloth of air compartment 32
It is placed between loosening air compartment 31 and returning charge air compartment 33, loosens air compartment 31 and be arranged in the lower end of cyclone separator 23 outlet side, returning charge
Air compartment 33 is arranged in the side of burner hearth 1, and the side wall for loosening air compartment 31, flowing air compartment 32 and returning charge air compartment 33 is provided with air-vent, pine
The bottom of dynamic air compartment 31, flowing air compartment 32 and returning charge air compartment 33 is provided with ash port, air-vent connection induced duct, ash port connection
Ash tube 25, the upper end of returning charge bellows 29 connection air distribution plate 34, the upper end of air distribution plate 34 is provided with material returning device case 30, pacifies on air distribution plate 34
Equipped with the material returning device blast cap through air distribution plate 34, the venthole of material returning device blast cap is all located on blast cap head, during replacing blast cap only
Blast cap head need to be changed, it is convenient and swift.Three air compartments of returning charge bellows 29 give loosen wind, flowing wind and returning charge wind on demand,
Returning charge ash temperature and returning charge amount are all more effectively controlled, and returning charge effect is good so that high-efficiency operation is obtained burner hearth at full capacity
Preferably ensure, and simple structure, prevent recirculating fluidized bed material-returning device dust deposition.
Coal enters burner hearth 1 from coal supply system 2, enters one or two times of burner hearth 1 with from primary air system 11, secondary air system 12
Wind, under corresponding sunken bed temperature low excess air operation system operatio, in the burning of the internal classification of burner hearth 1, the ash of generation passes through piece-rate system 3
After efficiently separating, circulating ash returns to burner hearth 1 by the material return system 6 of stabilization, and remaining flying dust passes sequentially through the mistake of back-end ductwork 5
Hot device 7, economizer 8, air preheater 9, exhaust pass 10 enter dust arrester, and superheater 7 includes low temperature superheater and high temperature
Superheater.
Corresponding runtime of the invention is sunken bed temperature, the method for operation of hypoxemia amount, N0xGeneration be that a chemistry is anti-
Should, the factor influence of coal is removed, its production rate is main relevant with temperature, oxygen amount.Research shows, when control burning of coal temperature and
After oxygen amount, N0xGrowing amount can substantially reduce.Therefore, we use sunken bed temperature（880 ~ 910 DEG C of bed temperature at full capacity）, hypoxemia amount
（Furnace outlet excess air coefficient 1.16, oxygen amount 2.9%）The method of operation lower N0x, this mainly has benefited from above-mentioned efficiently separating
Device can guarantee that enough the concentration of furnace ash.
Compared with prior art, the present invention has advantages below：
（1）Low azo-cycle protects-from CFB boiler N0xThe mechanism of generation is set about, and using fractional combustion mode, makes burner hearth bottom be stronger
Reducing atmosphere, prevent local oxygen-enriched, while using the method for operation of sunken bed temperature, reduction N0xRaw emissions, so that N0xRow
It is unconventional and unrestrained to 50-120mg/m3.
（2）Energy-efficient-from the composition of boiler heat loss, the governing factor of various heat losses is analyzed, put forth effort to reduce
Each loss, improves boiler thermal output, and 1% is improved than existing Thermal Efficiency of Circulating Fluidized Bed Boiler；Take measures in the design, drop
Low overfire air fan pressure head and returning charge fan delivery, reducing energy consumption, so that station service power consumption rate is reduced, than existing same capacity boilers reduction
30%。
（3）Reliable and stable-rational flue gas flow rate of selection, and abrasion mechanism to each position of boiler is analyzed, to not
Different Precautionary Measures is used with position, mitigates overall wear, prevent concentrated wear, the service life of each part is improved, to giving
Coal and the slag that falls are using distinctive structure, it is ensured that boiler safe operation steady in a long-term.
Claims (10)
1. the energy-efficient Circulating Fluidized Bed Boiler of a kind of low nitrogen, it is characterised in that it includes burner hearth, the burner hearth
Lower end is provided with coal supply system and a secondary air system, and the burner hearth upper end connects piece-rate system, and the piece-rate system includes dividing
From device inlet flue duct and cyclone separator, gametic fertility system in stove is provided between the burner hearth and the cyclone separator,
The separator inlet flue duct connects the burner hearth, the cyclone separator upper end inlet communication back-end ductwork, the whirlwind point
Material return system is installed between device lower part outlet and the burner hearth lower end, superheater is provided with the back-end ductwork, coal is saved
Device and preheater and connection outlet flue；One secondary air system include primary air system and secondary air system, it is described once
Wind system includes First air air inlet structure and subregion cloth wind structure, and the First air air inlet structure includes multiple lama's mouth structures,
Lama's mouth structure is arranged in the rear wall of the burner hearth, and the subregion cloth wind structure is specially the burner hearth surrounding and the slag that falls
Percent opening at pipe is more than other regions, and the secondary air system is the double-decker of the upper and lower, First air and Secondary Air
Ratio is 1:1.
2. the energy-efficient Circulating Fluidized Bed Boiler of a kind of low nitrogen according to claim 1, it is characterised in that
The coal supply system includes the coal spout that is in tilted layout, and the coal spout upper end is provided with adapter, the adapter upper end connect to
Coal machine, the adapter bottom is provided with airduct of delivering coal corresponding with the coal spout incline direction, and the coal breakage bottom of the tube is set
There is coal spread wind pipe and the burner hearth is connected by coal breakage plate.
3. the energy-efficient Circulating Fluidized Bed Boiler of a kind of low nitrogen according to claim 2, it is characterised in that
The adapter upper end connects the feeder by expansion joint, and feed hopper is provided with the feeder.
4. the energy-efficient Circulating Fluidized Bed Boiler of a kind of low nitrogen according to claim 2, it is characterised in that
The adapter is vertically arranged, and the coal spout is 150 ° with the angle of the adapter, and the coal breakage plate is in tilted layout and is steel plate,
The coal spread wind pipe incline direction is consistent with the coal breakage plate.
5. the energy-efficient Circulating Fluidized Bed Boiler of a kind of low nitrogen according to claim 2, it is characterised in that
The narrow rectangular tubes of coal spread wind Guan Weibian, are highly 30mm, and the coal spout is provided with wear-resistant block with the adapter junction, described
Wear-resistant castable is filled with wear-resistant block.
6. the energy-efficient Circulating Fluidized Bed Boiler of a kind of low nitrogen according to claim 1, it is characterised in that
The lower floor of the secondary air system accounts for 15%, and the lower floor of the secondary air system is apart from air distribution plate 2.5-2.7m, the Secondary Air system
The upper strata of system is apart from the air distribution plate 4.5-5.5m.
7. the energy-efficient Circulating Fluidized Bed Boiler of a kind of low nitrogen according to claim 1, it is characterised in that
The scroll-case type vapor-cooling cyclonic separator that the cyclone separator has a down dip for import, the central tube bias of the cyclone separator sets
Put.
8. the energy-efficient Circulating Fluidized Bed Boiler of a kind of low nitrogen according to claim 7, it is characterised in that
The separator inlet flue duct is along the lateral wall in flow of flue gas direction for plane and, madial wall tangent with the cyclone separator are
Three sections of folding faces, the folding face and the angle of the lateral wall being connected with the burner hearth are 35 ° ± 10 °, with the cyclonic separation
The connected folding face of device is parallel with the lateral wall and the distance between two faces are flue minimum widith, the middle folding
Face is 15 ° ± 10 ° with the angle of the lateral wall, and the ratio between height and flue minimum widith of the separator inlet flue duct are 3-
5.5。
9. the energy-efficient Circulating Fluidized Bed Boiler of a kind of low nitrogen according to claim 1, it is characterised in that
In the stove gametic fertility system include SNCR spray guns, the SNCR spray guns be arranged on the burner hearth and the cyclone separator it
Between.
10. a kind of energy-efficient Circulating Fluidized Bed Boiler of low nitrogen according to claim 1, its feature exists
In the material return system includes inlet ductwork, U-shaped material returning device and export pipeline, and the U-shaped material returning device includes returning charge bellows and returns
Glassware case, the returning charge bellows include loosening air compartment, flowing air compartment and returning charge air compartment, and the flowing air compartment is arranged in the loosening
Between air compartment and the returning charge air compartment, the loosening air compartment is arranged in the cyclone separator lower end outlet side, the returning charge
Air compartment is arranged in the burner hearth side, and the side wall of the loosening air compartment, flowing air compartment and returning charge air compartment is provided with air-vent, described
The bottom for loosening air compartment, flowing air compartment and returning charge air compartment is provided with ash port, and the air-vent connects induced duct, the ash port
Connection ash tube, the returning charge bellows upper end connects air distribution plate, and the air distribution plate upper end is provided with the material returning device case, the cloth
Material returning device blast cap through the air distribution plate is installed, the venthole of the material returning device blast cap is all located at blast cap head on aerofoil
On.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710081042.6A CN106838892A (en) | 2017-02-15 | 2017-02-15 | A kind of energy-efficient Circulating Fluidized Bed Boiler of low nitrogen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710081042.6A CN106838892A (en) | 2017-02-15 | 2017-02-15 | A kind of energy-efficient Circulating Fluidized Bed Boiler of low nitrogen |
Publications (1)
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| CN107191922A (en) * | 2017-06-29 | 2017-09-22 | 平湖热电厂 | Low nitrogen burning CFBB |
| CN107420888A (en) * | 2017-08-10 | 2017-12-01 | 郑州中鼎锅炉股份有限公司 | A kind of high low speed CFBB |
| CN107497268A (en) * | 2017-10-13 | 2017-12-22 | 广东丰乐能源科技有限公司 | A kind of coal-fired flue-gas processing system and coal-burning boiler system |
| CN107940448A (en) * | 2017-12-19 | 2018-04-20 | 太原锅炉集团有限公司 | A kind of pulverized coal particle recirculating fluidized bed combustion system and its combustion method |
| CN108954298A (en) * | 2018-08-20 | 2018-12-07 | 山东省建设高压容器有限公司 | A kind of circulating fluidized bed boiler low nitrogen burning exhaust system and its remodeling method |
| CN109894287A (en) * | 2019-04-03 | 2019-06-18 | 清华大学 | A kind of scroll casing type efficient cyclone |
| CN110500577A (en) * | 2019-08-05 | 2019-11-26 | 陈其钻 | Low nitrogen burning circulating fluidized bed boiler and application method |
| CN111664445A (en) * | 2020-07-10 | 2020-09-15 | 青岛特利尔环保集团股份有限公司 | Semi-coke powder circulating fluidized bed boiler based on material heat balance |
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| CN109894287A (en) * | 2019-04-03 | 2019-06-18 | 清华大学 | A kind of scroll casing type efficient cyclone |
| CN110500577A (en) * | 2019-08-05 | 2019-11-26 | 陈其钻 | Low nitrogen burning circulating fluidized bed boiler and application method |
| CN111664445A (en) * | 2020-07-10 | 2020-09-15 | 青岛特利尔环保集团股份有限公司 | Semi-coke powder circulating fluidized bed boiler based on material heat balance |
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