CN206504320U - The energy-efficient Circulating Fluidized Bed Boiler of low nitrogen - Google Patents
The energy-efficient Circulating Fluidized Bed Boiler of low nitrogen Download PDFInfo
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- CN206504320U CN206504320U CN201720135640.2U CN201720135640U CN206504320U CN 206504320 U CN206504320 U CN 206504320U CN 201720135640 U CN201720135640 U CN 201720135640U CN 206504320 U CN206504320 U CN 206504320U
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Abstract
A kind of energy-efficient Circulating Fluidized Bed Boiler of low nitrogen, it can effectively reduce the growing amount of contaminant gases, boiler efficiency is improved while reduction 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 utility model belongs to boiler plant field, and in particular to a kind of energy-efficient HTHP of low nitrogen is ciculation fluidized
Bed boiler.
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 great 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, which combine, to be issued《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 reaches 50,35,10mg/m3, this enables low-temperature burning effectively to suppress 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
Dramatically increase the operating cost of enterprise and transformation cycle length, investment of equipment are 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 utility model proposes a kind of energy-efficient HTHP recycle stream of low nitrogen
Fluidized bed boiler.
Utility model content
In order to solve the above problems, the utility model provides a kind of energy-efficient HTHP recirculating fluidized bed of low nitrogen
Boiler, it can effectively reduce the growing amount of contaminant gases, improve boiler efficiency while reduction energy consumption, it is stable can
Lean on.
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 bell-mouth structure of air, and the bell-mouth structure of air is arranged in the rear wall of the burner hearth, and the subregion cloth wind structure is specific
It is more than other regions for the percent opening at the burner hearth surrounding and slag dropping tube, the secondary air system is the double of 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 is connected by expansion joint and is provided with feed hopper on the feeder, the feeder；
The adapter is vertically arranged, and the coal spout and the angle of the adapter are 150 °, and the coal breakage plate is in tilted layout
And be 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 with the adapter junction provided with resistance to
Wear-resistant castable is filled with abrading block, the wear-resistant block；
The lower floor accounts for 15%, and the lower floor is apart from air distribution plate 2.5-2.7m, and the upper strata is apart from the air distribution plate 4.5-
5.5m；
The cyclone separator is the scroll-case type vapor-cooling cyclonic separator that import has a down dip, the central tube of the cyclone separator
Eccentric setting；
Lateral wall of the separator inlet flue duct along flow of flue gas direction be plane and with the cyclone separator it is tangent,
Madial wall is three sections of folding faces, and the angle of the folding face being connected with the burner hearth and the lateral wall is 35 ° ± 10 °, and described
The connected folding face of cyclone separator is parallel with the lateral wall and the distance between two faces are flue minimum widith, centre
The angle of the folding face and the lateral wall be 15 ° ± 10 °, height and the flue minimum widith of the separator inlet flue duct
The ratio between be 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 whirlwind
Between separator；
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 wind
Case 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 institute
State between loosening air compartment and the returning charge air compartment, the loosening air compartment is arranged in cyclone separator lower end outlet side, institute
State returning charge air compartment and be arranged in the burner hearth side, the side wall of the loosening air compartment, flowing air compartment and returning charge air compartment is provided with air inducing
Mouthful, 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, institute
Ash port connection ash tube is stated, the returning charge bellows upper end connects air distribution plate, and the air distribution plate upper end is provided with the material returning device
Material returning device blast cap through the air distribution plate is installed, the venthole of the material returning device blast cap is all set on case, the air distribution plate
On blast cap head.
After boiler of the present utility model, using fractional combustion mode, it is stronger reducing atmosphere to make burner hearth bottom,
Prevent local oxygen-enriched, while using the method for operation of sunken bed temperature, reducing N0xRaw emissions, so that N0xDischarge reaches 50-
120mg/m3, one overfire air fan pressure head of reduction and returning charge fan delivery, reduce energy consumption, so that station service power consumption rate is reduced, it is more same than existing
Capacity boilers reduction by 30%, overall operation is reliable and stable.
Brief description of the drawings
Fig. 1 is the utility model structural representation；
Fig. 2 is the structural representation of the utility model coal supply system；
Fig. 3 is the structural representation of the utility model primary air system；
Fig. 4 is the structural representation of the utility model secondary air system；
Fig. 5 is the structural representation of the utility model piece-rate system；
Fig. 6 is Fig. 5 top view；
Fig. 7 is the structural representation of the utility model material return system.
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 one, 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 bell-mouth structure of air 13, bell-mouth structure of air 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 make coal enter stove it is heated after, 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, which is provided with, to be vertically arranged and section is square
The adapter 14 of shape, the upper end of adapter 14 is connected by expansion joint and is provided with feed hopper 17, the bottom of adapter 14 on feeder 18, 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 passed through
Coal breakage plate 22 connects burner hearth.Coal spout is 150 ° with the angle taken over, 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 is provided with wear-resistant block 21, wear-resistant block 21 with the junction of adapter 14 and is filled with wear-resistant castable.
Cyclone separator 23 is the scroll-case type vapor-cooling cyclonic separator that import has a down dip, and the central tube of cyclone separator 23 is eccentric
Set；Lateral wall of the separator inlet flue duct 24 along flow of flue gas direction be plane and with cyclone separator 23 is tangent, madial wall
For three sections folding faces, the folding face being connected with burner hearth 1 and the angle of lateral wall are 35 °, the folding face being connected with cyclone separator 23 and outside
Side wall is parallel and the distance between two faces are flue minimum widith, and middle folding face and the angle of lateral wall are 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 adding 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；
It is simple in construction 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, which is provided with material returning device case 30, air distribution plate 34, pacifies
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 on demand loosens wind, flowing wind and returning charge wind,
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 it is simple in construction, prevent recirculating fluidized bed material-returning device dust deposition.
Coal enters burner hearth 1 from coal supply system 2, with entering one or two times of burner hearth 1 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 stable material return system 6, 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.
The corresponding runtime of the utility model is sunken bed temperature, the method for operation of hypoxemia amount, N0xGeneration be a chemistry
Reaction, removes the factor influence of coal, and its production rate is main relevant with temperature, oxygen amount.Research shows, when control burning of coal temperature
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 efficient point
Enough the concentration of furnace ash are can guarantee that from device.
Compared with prior art, the utility model has advantages below：
（1）Low azo-cycle protects-from CFB boiler N0xThe mechanism of generation is set about, using fractional combustion mode, makes the burner hearth bottom be
Stronger reducing atmosphere, prevents local oxygen-enriched, while using the method for operation of sunken bed temperature, reducing N0xRaw emissions, so that
N0xDischarge reaches 50-120mg/m3.
（2）Energy-efficient-from the composition of boiler heat loss, the governing factor of various heat losses is analyzed, puts forth effort reduction
Each loss, improves boiler thermal output, and 1% is improved than existing Thermal Efficiency of Circulating Fluidized Bed Boiler；Take measures, drop in the design
Low overfire air fan pressure head and returning charge fan delivery, reduce energy consumption, so as to reduce station service power consumption rate, are reduced than existing same capacity boilers
30%。
（3）Reliable and stable-rational flue gas flow rate of selection, and the abrasion mechanism at each position of boiler is analyzed, to not
Use different Precautionary Measures with position, mitigate overall wear, prevent concentrated wear, improve the service life of each part, to
Coal uses distinctive structure with slag is fallen, 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
Superheater, province's coal are provided with from being provided between device lower part outlet and the burner hearth lower end in material return system, the back-end ductwork
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 bell-mouth structure of air,
The bell-mouth structure of air is arranged in the rear wall of the burner hearth, and the subregion cloth wind structure is specially the burner hearth surrounding and falls slag
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. a kind of energy-efficient Circulating Fluidized Bed Boiler 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. a kind of energy-efficient Circulating Fluidized Bed Boiler of low nitrogen according to claim 2, it is characterised in that
The adapter upper end is connected by expansion joint and is provided with feed hopper on the feeder, the feeder.
4. a kind of energy-efficient Circulating Fluidized Bed Boiler of low nitrogen according to claim 2, it is characterised in that
The adapter is vertically arranged, and the coal spout and the angle of the adapter are 150 °, 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. a kind of energy-efficient Circulating Fluidized Bed Boiler 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. a kind of energy-efficient Circulating Fluidized Bed Boiler 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. a kind of energy-efficient Circulating Fluidized Bed Boiler of low nitrogen according to claim 1, it is characterised in that
The cyclone separator is the scroll-case type vapor-cooling cyclonic separator that import has a down dip, and the central tube bias of the cyclone separator is set
Put.
8. a kind of energy-efficient Circulating Fluidized Bed Boiler of low nitrogen according to claim 7, it is characterised in that
Lateral wall of the separator inlet flue duct along flow of flue gas direction be plane and with the cyclone separator is tangent, madial wall is
Three sections of folding faces, the folding face being connected with the burner hearth and the angle of the lateral wall 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
The angle of face and the lateral wall is 15 ° ± 10 °, and the ratio between height and flue minimum widith of the separator inlet flue duct are 3-
5.5。
9. a kind of energy-efficient Circulating Fluidized Bed Boiler of low nitrogen according to claim 1, it is characterised in that
Gametic fertility system includes SNCR spray guns in the stove, 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 returned
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 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
Ash tube is connected, 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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720135640.2U CN206504320U (en) | 2017-02-15 | 2017-02-15 | The energy-efficient Circulating Fluidized Bed Boiler of low nitrogen |
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| CN201720135640.2U CN206504320U (en) | 2017-02-15 | 2017-02-15 | The energy-efficient Circulating Fluidized Bed Boiler of low nitrogen |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106838892A (en) * | 2017-02-15 | 2017-06-13 | 无锡华光锅炉股份有限公司 | A kind of energy-efficient Circulating Fluidized Bed Boiler of low nitrogen |
| CN108826280A (en) * | 2018-06-29 | 2018-11-16 | 无锡华光锅炉股份有限公司 | A kind of circulating fluidized bed boiler using Indonesia coal |
| CN110500577A (en) * | 2019-08-05 | 2019-11-26 | 陈其钻 | Low nitrogen burning circulating fluidized bed boiler and application method |
| CN116481021A (en) * | 2023-05-17 | 2023-07-25 | 哈尔滨红光锅炉总厂有限责任公司 | Environment-friendly energy-saving circulating fluidized bed boiler capable of respectively burning coal and coal water slurry |
-
2017
- 2017-02-15 CN CN201720135640.2U patent/CN206504320U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106838892A (en) * | 2017-02-15 | 2017-06-13 | 无锡华光锅炉股份有限公司 | A kind of energy-efficient Circulating Fluidized Bed Boiler of low nitrogen |
| CN108826280A (en) * | 2018-06-29 | 2018-11-16 | 无锡华光锅炉股份有限公司 | A kind of circulating fluidized bed boiler using Indonesia coal |
| CN110500577A (en) * | 2019-08-05 | 2019-11-26 | 陈其钻 | Low nitrogen burning circulating fluidized bed boiler and application method |
| CN116481021A (en) * | 2023-05-17 | 2023-07-25 | 哈尔滨红光锅炉总厂有限责任公司 | Environment-friendly energy-saving circulating fluidized bed boiler capable of respectively burning coal and coal water slurry |
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Address after: 214028 No. 3 Chengnan Road, new Wu District, Jiangsu, Wuxi Patentee after: Wuxi Huaguang Environmental Protection Energy Group Co., Ltd Address before: 214028 No. 3 Chengnan Road, new Wu District, Jiangsu, Wuxi Patentee before: WUXI HUAGUANG BOILER Co.,Ltd. |
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