CN209325769U - Circulating fluidized bed boiler fly ash reinjection system - Google Patents
Circulating fluidized bed boiler fly ash reinjection system Download PDFInfo
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- CN209325769U CN209325769U CN201821942100.6U CN201821942100U CN209325769U CN 209325769 U CN209325769 U CN 209325769U CN 201821942100 U CN201821942100 U CN 201821942100U CN 209325769 U CN209325769 U CN 209325769U
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Abstract
The utility model belongs to circulating fluidized bed boiler field, and in particular to a kind of circulating fluidized bed boiler fly ash reinjection system.The fly ash reinjection system, including burner hearth, high temperature superheater and deduster, upper furnace are connected by cyclone separator with high temperature superheater one end bottom, and the high temperature superheater other end is connected with deduster, and deduster bottom is provided with dust collector ash hopper；Lower furnace portion one end is connected with burner hearth returning charge battered leg, flying dust jet pipe is provided on the upside of boiler returning charge battered leg, flying dust jet pipe is connect by pipeline one with powder pumps outlet end, powder pumps top is connected with electric frequency conversion star-shaped feeding machine, electric frequency conversion star-shaped feeding machine is connected with flying dust gate valve respectively by the both ends of defeated grey skewed slot, and defeated ash gate valve is connect by defeated ash material envelope pump, pipeline two with grey library.The fly ash reinjection system can not only improve the on-load ability and the thermal efficiency of boiler, reduce unburned carbon in flue dust, and structure is simple, energy consumption is lower.
Description
Technical field
The utility model belongs to circulating fluidized bed boiler field, and in particular to a kind of circulating fluidized bed boiler fly-ash reburning dress
It sets.
Background technique
Technology of Circulating Fluidized Bed Boiler is a kind of high-efficiency low-pollution cleaning coal-burning boiler rapidly developed in recent ten years, is made
For the important representative of clean coal technology, because the direct desulfurization in furnace combustion process may be implemented in it, simultaneously because its low temperature point
Section burning (900 DEG C or so) the characteristics of, can effectively inhibit the discharge of nitrogen oxides, in industrial productivity enterprise using compared with
It is more, but that there are boiler on-load abilities in actual motion use process is poor, bed temperature is high, flying dust calorific value height, serious wear, fortune
The problems such as row period is short, SNCR denitration low efficiency；It generally requires to pass through increasing to enhance the on-load ability of circulating fluidized bed boiler
The on-load for adding first and second air quantity of boiler, reducing the means measures such as coal-fired calorific value to reduce bed temperature, increase Coal-fired capacity and boiler
Ability, taking the above measure will lead to, the flue gas flow rate in boiler is accelerated, abrasion aggravates, excess air coefficient increases, and makes boiler
Pollutant emission reduced value in flue gas increases, and threatens the long-term operation of boiler, and according to the coal of somewhere local government
Quality requirement, the calorific value need >=21.74MJ/Kg (5200 kilocalorie) of station boiler, Industrial Boiler coal, because of fuel tolerance
Problem, this will reduce the on-load ability of circulating fluidized bed boiler, and the fly ash combustible material of circulating fluidized bed boiler can be made big
Amplitude increases, and increases physics heat loss due to incomplete combustion.
The remodeling method for improving boiler on-load ability at present mostly uses cyclone separator to improve separative efficiency or using combustion
The low granularity transformation of coal crusher improves separative efficiency with cyclone separator and united method is transformed, although achieving certain effect
Fruit, but the defect of this method is that partial particulate degree is still difficult to separate capture by cyclone separator compared with thin, the higher flying dust of calorific value
Get off, the unburned carbon in flue dust of boiler is caused significantly to increase, highest unburned carbon in flue dust is up to 25% or more, physics imperfect combustion
Heat loss is still more serious.
Chinese invention patent CN203442806U discloses a kind of circulating fluidized bed boiler fly ash reinjection system, is provided with furnace
The equipment such as Qian Cang, storehouse pump, air accumulator, air compressor plant, pulse dust collector, pneumatic control valve realize fly-ash reburning, improve boiler
The purpose of on-load ability and boiler thermal efficiency, but its equipment and system is more complex, control point is more, first cost and energy consumption
Higher, occupied area is larger.In addition, the flying dust spout of the patent is located at lower furnace portion, no matter coal feeding hole or Secondary Air are used
There is the abrasion of flying dust access section in mouth access, influence boiler long-term operation.
Utility model content
In view of the deficiencies of the prior art, problem to be solved in the utility model is: it is winged to provide a kind of circulating fluidized bed boiler
The on-load ability and the thermal efficiency of boiler not only can be improved in grey reburning device, reduces unburned carbon in flue dust, and initial cost cost
Low, structure is simple, and occupied area is small, and energy consumption is lower.
To achieve the above object, the utility model adopts the following technical scheme:
A kind of circulating fluidized bed boiler fly ash reinjection system, including burner hearth, high temperature superheater and deduster, upper furnace are logical
It crosses cyclone separator to be connected with high temperature superheater one end bottom, the high temperature superheater other end is connected with deduster, deduster bottom
Portion is provided with dust collector ash hopper；Lower furnace portion one end is connected with boiler returning charge battered leg, is provided with flying dust on the upside of boiler returning charge battered leg
Jet pipe, flying dust jet pipe are connect by pipeline one with powder pumps outlet end, and powder pumps top is connected with electric frequency conversion star-shaped feeding machine,
Electric frequency conversion star-shaped feeding machine is connected with flying dust gate valve respectively by the both ends of defeated grey skewed slot, and defeated ash gate valve is sealed by defeated ash material
Pump, pipeline two are connect with grey library, and powder pumps arrival end is connect by pipeline three with roots blower；The arrival end of defeated ash material envelope pump is logical
Piping four is connected with roots blower.
The dust collector ash hopper bottom is provided with defeated grey gate valve and flying dust gate valve；Boiler returning charge battered leg by material returning device with
Cyclone separator bottom end is connected.
Fluidized wind is accessed from roots blower exit in the powder pumps bottom.
Flying dust in the dust collector ash hopper is proportionally delivered in grey library and boiler returning charge battered leg.
The electric frequency conversion star-shaped feeding machine and flying dust gate valve connects by the way of defeated grey skewed slot, defeated ash skewed slot
Quantity is that the quantity of dust collector ash hopper subtracts the quantity of powder pumps.
The quantity of the defeated grey gate valve is equal to the quantity of defeated ash material envelope pump, and the quantity of flying dust gate valve is equal to defeated grey skewed slot
Quantity adds the quantity of powder pumps.
The dust collector ash hopper cooperates with control with the revolving speed of electric frequency conversion star-shaped feeding machine by the aperture of defeated ash material envelope pump
The material position of dust collector ash hopper processed.
The quantity of the roots blower is equal to the quantity of boiler returning charge battered leg multiplied by two；The quantity and boiler of flying dust jet pipe
The quantity of returning charge battered leg is equal.
The quantity of the powder pumps is equal with the quantity of boiler returning charge battered leg；The quantity of electric frequency conversion star-shaped feeding machine with
The quantity of powder pumps is equal.
The dust collector ash hopper passes through the aperture of defeated ash material envelope pump for the flying dust for storing deduster separation, capturing
With the material position of the ash bucket of the revolving speed Collaborative Control boiler dust remover of electric frequency conversion star-shaped feeding machine, guarantee that flying dust returns continuous
Property.
Compared with prior art, the utility model has the following beneficial effects:
1) deduster collect flying dust through fly ash reinjection system return furnace in again burning can be improved boiler burner hearth it is poor
Pressure, improves the on-load ability of boiler, the phosphorus content of flying dust is effectively reduced, and can significantly improve the upper furnace of boiler, divide
Temperature from device and high temperature superheater is conducive to the SNCR denitration reaction of boiler, improves the denitration efficiency of SNCR denitration system, drop
NOX Pollutant emission concentration in low boiler smoke；
2) flying dust that boiler dust remover is collected returns to the furnace heat transfer that boiler can be enhanced in furnace through fly ash reinjection system, makes
The top and the bottom temperature gap of boiler furnace is reduced, and is improved the circulating ratio of boiler, is reduced the bed temperature of boiler, to make boiler
It is reduced with air quantity, power consumption；
3) return furnace in flying dust controlled through electric frequency conversion star-shaped feeding machine, it is ensured that flying dust gray back amount it is continuous
Property and adjustability, by change electric frequency conversion star-shaped feeding machine revolving speed can control burner hearth differential pressure, avoid because of flying dust amount not
Stable or burner hearth differential pressure causes the fluctuation of boiler parameter extremely, and may be implemented remotely to control；
4) flying dust that the fly ash reinjection system described in stores deduster separation by boiler dust remover ash bucket, captures,
Without additionally building flying dust storage warehouse and stokehold storehouse, and pass through turn of the aperture of defeated ash material envelope pump and electric frequency conversion star-shaped feeding machine
The material position of the ash bucket of fast Collaborative Control boiler dust remover guarantees the continuity that flying dust returns；
5) fly ash reinjection system described in has initial cost at low cost, and structure is simple, and occupied area is small, and energy consumption is lower and winged
The non-maintaining advantage in the position of ash access boiler.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model；
In figure, 1- boiler returning charge battered leg；2- flying dust jet pipe；3- pipeline one；4- powder pumps；5- star-shaped feeding machine；The defeated ash of 6-
Skewed slot；7- flying dust gate valve；8- dust collector ash hopper；The defeated grey gate valve of 9-；The defeated ash material envelope pump of 10-；11- pipeline two；12- ash library；13-
Pipeline three；14- roots blower；15- material returning device；16- burner hearth；17- cyclone separator；18- upper furnace；19- hyperthermia and superheating
Device；20- deduster；21- pipeline four.
Specific embodiment
The utility model is further described with reference to the accompanying drawings and examples.
Embodiment 1
A kind of circulating fluidized bed boiler fly ash reinjection system, including burner hearth, high temperature superheater and deduster, upper furnace 18
It is connected by cyclone separator 17 with 19 one end bottom of high temperature superheater, 19 other end of high temperature superheater is connected with deduster
20, deduster bottom is provided with dust collector ash hopper 8；16 lower end thereof of burner hearth is connected with boiler returning charge battered leg 1, boiler returning charge battered leg
1 upside is provided with flying dust jet pipe 2, and flying dust jet pipe 2 is connect by pipeline 1 with 4 outlet end of powder pumps, the connection of 4 top of powder pumps
Have an electric frequency conversion star-shaped feeding machine 5, electric frequency conversion star-shaped feeding machine 5 by the both ends of defeated grey skewed slot 6 respectively with flying dust gate valve 7
It is connected, defeated ash gate valve 9 is connect by defeated ash material envelope pump 10, pipeline 2 11 with grey library 12, and 4 arrival end of powder pumps passes through pipeline three
13 connect with roots blower 14；The arrival end of defeated ash material envelope pump 10 is connected by pipeline 4 21 with roots blower 14.
8 bottom of dust collector ash hopper is provided with defeated grey gate valve 9 and flying dust gate valve 7；Boiler returning charge battered leg 1 passes through returning charge
Device 15 is connected with 17 bottom end of cyclone separator.
Fluidized wind is accessed from 14 exit of roots blower in 4 bottom of powder pumps.
The connection of the electric frequency conversion star-shaped feeding machine 5 and flying dust gate valve 7 is by the way of defeated grey skewed slot 6, and defeated ash is tiltedly
The quantity of slot 6 is that the quantity of dust collector ash hopper 8 subtracts the quantity of powder pumps 4.
The quantity of the defeated grey gate valve 9 is equal to the quantity of defeated ash material envelope pump 10, and the quantity of flying dust gate valve 7 is equal to defeated ash tiltedly
The quantity of slot 6 adds the quantity of powder pumps 4.
The dust collector ash hopper 8 is assisted by the aperture of defeated ash material envelope pump 10 and the revolving speed of electric frequency conversion star-shaped feeding machine 5
With the material position of control dust collector ash hopper 8.
The quantity of the roots blower 14 is equal to the quantity of boiler returning charge battered leg 1 multiplied by two；The quantity of flying dust jet pipe 2 with
The quantity of boiler returning charge battered leg 1 is equal.
The quantity of the powder pumps 4 is equal with the quantity of boiler returning charge battered leg 1；The number of electric frequency conversion star-shaped feeding machine 5
It measures equal with the quantity of powder pumps 4.
Working process and principle: when operation, the outlet of the dust collector ash hopper 8 of boiler is provided with defeated grey gate valve 9 and flying dust lock
Valve 7 is connect with fly ash reinjection system, ash conveying device respectively, passes through the aperture and the star-like feed of electric frequency conversion of defeated ash material envelope pump 10
The material position of the revolving speed Collaborative Control boiler dust remover ash bucket 8 of machine 5 guarantees the continuity that flying dust returns, falls into inside powder pumps 4
Flying dust enters under the conveying capacity effect for Roots's wind that roots blower 14 provides through pipeline 1, the flying dust jet pipe 2 before flying dust jet pipe
Boiler returning charge battered leg 1, and burner hearth 16 is returned together with the material in boiler returning charge battered leg 1, participate in the Matter Transfer in burner hearth 16
Pot can be improved in outer circulation between burner hearth 16, cyclone separator 17 and material returning device 15, the Matter Transfer participated in burner hearth 16
The burner hearth differential pressure of furnace, improves the on-load ability of boiler, and participate between burner hearth 16, cyclone separator 17 and material returning device 15 outer follows
Ring can make flying dust repeatedly participate in burning, and the phosphorus content of flying dust is effectively reduced, and can significantly improve boiler furnace top 18, rotation
The temperature of wind separator 17 and high temperature superheater 19 improves the de- of SNCR denitration system so that the SNCR denitration of boiler is reacted
Nitre efficiency reduces the NOX Pollutant emission concentration in boiler smoke.
When normal operation, according to the burner hearth differential pressure value of boiler furnace 16, by adjusting the aperture control of defeated ash material envelope pump 10
The output flying dust amount of deduster 20 makes the deduster 20 of boiler export the flying dust amount that flying dust amount is generated with boiler and reaches balance.
In the above-described embodiments, the operation embodiment of the utility model is described, it is clear that in the utility model
Under inventive concept, it can produce a variety of variations.Illustrate herein, any change made under the inventive concept of utility model is all
It will fall into the protection scope of the utility model.
Claims (8)
1. a kind of circulating fluidized bed boiler fly ash reinjection system, including burner hearth, high temperature superheater and deduster, it is characterised in that:
Upper furnace (18) is connected by cyclone separator (17) with high temperature superheater (19) one end bottom, and high temperature superheater (19) is another
One end is connected with deduster (20), and deduster bottom is provided with dust collector ash hopper (8)；Burner hearth (16) lower end thereof is connected with boiler
Returning charge battered leg (1), boiler returning charge battered leg (1) upside are provided with flying dust jet pipe (2), and flying dust jet pipe (2) passes through pipeline one (3) and powder
(4) the outlet end connection of material pump, powder pumps (4) top is connected with electric frequency conversion star-shaped feeding machine (5), electric frequency conversion star-shaped feeding machine
(5) it is connected respectively with flying dust gate valve (7) by the both ends of defeated grey skewed slot (6), defeated ash gate valve (9) is sealed by defeated ash material to be pumped
(10), pipeline two (11) is connect with grey library (12), and powder pumps (4) arrival end is connected by pipeline three (13) and roots blower (14)
It connects；The arrival end of defeated ash material envelope pump (10) is connected by pipeline four (21) with roots blower (14).
2. circulating fluidized bed boiler fly ash reinjection system according to claim 1, it is characterised in that: dust collector ash hopper (8)
Bottom is provided with defeated grey gate valve (9) and flying dust gate valve (7)；Boiler returning charge battered leg (1) passes through material returning device (15) and cyclone separator
(17) bottom end is connected.
3. circulating fluidized bed boiler fly ash reinjection system according to claim 1, it is characterised in that: powder pumps (4) bottom
Fluidized wind is accessed from roots blower (14) exit.
4. circulating fluidized bed boiler fly ash reinjection system according to claim 1, it is characterised in that: electric frequency conversion is star-like to be given
By the way of defeated grey skewed slot (6), the quantity of defeated ash skewed slot (6) is dust collector ash hopper for the connection of material machine (5) and flying dust gate valve (7)
(8) quantity subtracts the quantity of powder pumps (4).
5. circulating fluidized bed boiler fly ash reinjection system according to claim 1, it is characterised in that: defeated ash gate valve (9)
Quantity is equal to the quantity of material envelope pump (10)；The quantity that the quantity of grey gate valve (7) is equal to defeated grey skewed slot (6) adds the number of powder pumps (4)
Amount.
6. circulating fluidized bed boiler fly ash reinjection system according to claim 1, it is characterised in that: dust collector ash hopper (8)
The revolving speed Collaborative Control dust collector ash hopper (8) of the aperture and electric frequency conversion star-shaped feeding machine (5) that pump (10) is sealed by defeated ash material
Material position.
7. circulating fluidized bed boiler fly ash reinjection system according to claim 1, it is characterised in that: roots blower (14)
Quantity is equal to the quantity of boiler returning charge battered leg (1) multiplied by two；The quantity of flying dust jet pipe (2) and the quantity of boiler returning charge battered leg (1)
It is equal.
8. circulating fluidized bed boiler fly ash reinjection system according to claim 1, it is characterised in that: the number of powder pumps (4)
It measures equal with the quantity of boiler returning charge battered leg (1)；The quantity phase of the quantity of electric frequency conversion star-shaped feeding machine (5) and powder pumps (4)
Deng.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821942100.6U CN209325769U (en) | 2018-11-23 | 2018-11-23 | Circulating fluidized bed boiler fly ash reinjection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821942100.6U CN209325769U (en) | 2018-11-23 | 2018-11-23 | Circulating fluidized bed boiler fly ash reinjection system |
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| CN209325769U true CN209325769U (en) | 2019-08-30 |
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| CN201821942100.6U Active CN209325769U (en) | 2018-11-23 | 2018-11-23 | Circulating fluidized bed boiler fly ash reinjection system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110701607A (en) * | 2019-11-14 | 2020-01-17 | 山东福宽生物工程有限公司 | Boiler fly ash reburning device and method |
| CN111853763A (en) * | 2020-06-08 | 2020-10-30 | 山鹰华南纸业有限公司 | Method for supplying return circulating ash of circulating fluidized bed boiler |
| CN112178623A (en) * | 2020-08-27 | 2021-01-05 | 烟台清泉实业有限公司 | Generating set for large-proportion mixed combustion of dried sludge |
| CN113757640A (en) * | 2021-10-09 | 2021-12-07 | 焦作市华康糖醇科技有限公司 | Biomass chain boiler soot recycling system |
-
2018
- 2018-11-23 CN CN201821942100.6U patent/CN209325769U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110701607A (en) * | 2019-11-14 | 2020-01-17 | 山东福宽生物工程有限公司 | Boiler fly ash reburning device and method |
| CN111853763A (en) * | 2020-06-08 | 2020-10-30 | 山鹰华南纸业有限公司 | Method for supplying return circulating ash of circulating fluidized bed boiler |
| CN112178623A (en) * | 2020-08-27 | 2021-01-05 | 烟台清泉实业有限公司 | Generating set for large-proportion mixed combustion of dried sludge |
| CN113757640A (en) * | 2021-10-09 | 2021-12-07 | 焦作市华康糖醇科技有限公司 | Biomass chain boiler soot recycling system |
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