CN207486769U - A kind of high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler of pure combustion - Google Patents
A kind of high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler of pure combustion Download PDFInfo
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- CN207486769U CN207486769U CN201721565754.7U CN201721565754U CN207486769U CN 207486769 U CN207486769 U CN 207486769U CN 201721565754 U CN201721565754 U CN 201721565754U CN 207486769 U CN207486769 U CN 207486769U
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Abstract
The utility model discloses a kind of pure high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boilers of combustion, it includes burner hearth, is connected below burner hearth by small blast cap air distribution plate with isobaric air compartment, lower furnace portion is provided with feed pipe and pipe laying and returning charge mouth；The outlet turn downlink of burner hearth connects the first waterway, and the first waterway lower part, which is gradually reduced after downlink is turned round, to become larger, and connects level-one accelerated sedimentation separator, the lower curtate of level-one accelerated sedimentation separator is connected with subsider, and the bottom of subsider is connect with returning charge mouth；Level-one accelerated sedimentation separator top is connect with the second waterway, and the top arrangement coiled pipe low temperature superheater of the second waterway, the outlet of the second waterway is in series with two level spiral case cyclone separator.It to the heating surface most easily stain reduce and stains design and avoid sodium, potassium high temperature corrosion, solve the phenomenon that coking dust stratification is serious, achieve preferable effect by setting the first and second two water cooled membrane wall cavitys in furnace outlet.
Description
Technical field
The utility model is related to a kind of circulating fluidized bed boiler, more particularly to a kind of high sodium coal two-stage medium temperature separation of pure combustion follows
Ring fluid bed superheated steam boiler, belongs to boiler combustion equipment technical field.
Background technology
At present, generally to Xinjiang, the high sodium coal bad adaptability in quasi- east area, the boiler run are general for circulating fluidized bed boiler
It is that ginseng burns the high sodium coal in part, and universal coking dust stratification is serious, superheater steam temperature declines and sodium, potassium high temperature corrosion, causes boiler
Failure and high fume temperature.The quasi- high sodium coal feature in east is：Low ash, low-sulfur, low middle ash fusion point, high moisture content, high-volatile, middle height
Calorific value, high sodium, potassium, calcium, strong coking capacity, strong contamination, but after-flame function admirable of catching fire.The high sodium coal that burns mainly fundamentally will
Coking dust stratification serious phenomenon is solved, should strictly control ignition temperature, the 850-530 DEG C of heating surface most easily stain reduce and is stained with
Dirt designs and avoids sodium, potassium high temperature corrosion, therefore proposes very high requirement to hearth combustion and heating surface heat transfer.
Invention content
The technical problems to be solved in the utility model is：There is provided a kind of pure combustion high sodium coal two-stage medium temperature separation recirculating fluidized bed
Superheated steam boiler, it is by setting the first and second two water cooled membrane wall cavitys, heating surface inner surface in furnace outlet
Heat preservation isolation, in flying dust circulation loop, ash concentration is high for more cavity membrane walls and heating surface, not only enhances heat transfer but also improves certainly
Cleaning capacity strictly controls ignition temperature, and the 850-530 DEG C of heating surface most easily stain reduce and stains design and avoids
Sodium, potassium high temperature corrosion, solve the phenomenon that coking dust stratification is serious, thoroughly solve above-mentioned technical problem.
The technical solution of the utility model is：A kind of high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam pot of pure combustion
Stove, it includes low speed bed burner hearth, is connected below the low speed bed burner hearth by small blast cap air distribution plate with isobaric air compartment, low speed pool furnace
Thorax lower part is provided with feed pipe and pipe laying and returning charge mouth；Outlet turn downlink the first waterway of connection of low speed bed burner hearth, first
Waterway lower part, which is gradually reduced after downlink is turned round, to become larger, and connects level-one accelerated sedimentation separator, the level-one accelerated sedimentation separation
The lower curtate of device is connected with subsider, and the bottom of the subsider is connect with returning charge mouth；Level-one accelerated sedimentation separator top is another
End is connect with the second waterway, the top arrangement coiled pipe low temperature superheater of second waterway, the outlet point of the second waterway
It is not in series with two level spiral case cyclone separator, several groups of economizers, air preheater, fume treatment auxiliaries；Two level spiral case whirlwind
The bottom of separator is parallel with spiral ash discharger and U-shaped valve, and the U-shaped valve outlet tube passes through subsider to connect with low speed bed burner hearth
It connects.
The low speed bed burner hearth is up-small and down-big full film type wall structure, and low speed bed burner hearth inside smoke exports following side towards the fire
Wall with refractory lining, refracto is laid with, the wall with refractory lining, refracto is is arranged at intervals.Temperature measuring point is set every 2 meters on low speed bed burner hearth.
The cross section structure form of first waterway is up big and down small, and top side towards the fire is all laid with wall with refractory lining, refracto, the
Suspention has membrane wall to exceed the cold screen of vapour in one waterway top, and screen spacing is 500-800mm.
The a diameter of 50mm of blast cap of the small blast cap air distribution plate, a diameter of 4.5-5.2mm of air-permeating hole on blast cap, adjacent wind
Spacing is 70-75mm between cap.
The side towards the fire of the level-one accelerated sedimentation separator is laid with scuff-resistant coating.
The subsider membrane wall side towards the fire is exposed.
Second waterway is full film type wall structure, and coiled pipe low temperature superheater, the coiled pipe are disposed in top
Low temperature superheater is in-line coarse pitch, big pipe arranges pitch structure form, and the second waterway membrane wall side towards the fire bottom is laid with anti-
Grind layer, superheater and following laying insulating layer.
The two level spiral case cyclone separator be heat insulation-type, a length of 2000~2500mm of import steady flow segment.
The air preheater is in-line coarse pitch, big pipe arranges pitch structure form, in air preheater, economizer, snake
Soot blower is configured between shape pipe low temperature superheater for every grade, is connected between air preheater and isobaric air compartment with air hose, in wind
Pipe is equipped with flue gas and adds in mouth.
The beneficial effects of the utility model are：The advantage low by playing burning in circulating fluid bed boiler temperature reduces alkali
Metal and its compound gasification burst size.
（1）The burner hearth of the utility model is using low speed bed, emulsion zone combustion share height, because high sodium coal calorific value is high and catches fire
After-flame function admirable by increasing pipe laying area 20% and being adjusted using medium temperature returning charge cooling, can control ignition temperature in high sodium
Below coal meltbility slagging temperature.
（2）For the burner hearth of the utility model using low speed bed, dilute-phase zone combustion share is low, and water-cooling wall area is big so side towards the fire
Wall with refractory lining, refracto is laid, but is spaced exposed adjustable.The default low-intensity wall with refractory lining, refracto in interval is moldable, and temperature measuring point is set every 2 meters, according to
Running temperature determines the amount of destroying.Ignition temperature can be controlled in high sodium coal meltbility slagging temperature hereinafter, because medium temperature returning charge enters
It needs to increase preheating time after stove, so burner hearth flow time to be extended to about 1s designs more.
（3）The utility model is to 850-530 DEG C of heating surface most easily staiing, using the first and second two water cooled membrane walls
Cavity designs.The heat preservation isolation of heating surface inner surface, in flying dust circulation loop, ash concentration is high for more cavity membrane walls and heating surface,
Not only it enhances heat transfer but also improves automatical cleaning ability.First cavity ash concentration is consistent with burner hearth, flue gas downlink will not dust stratification, avoid
Sodium, potassium high temperature corrosion.Second cavity ash concentration is less than the first cavity, flue gas uplink, and cigarette speed improves 1m/s, is passed conducive to coiled pipe
Heat.Because having plenty of space, coiled pipe uses in-line multitube circle coarse pitch（S2）, big pipe row spacing（S1）, dust stratification bridging is not easy,
And install telescopic soot blower additional.
（4）600-650 DEG C of the utility model level-one accelerated sedimentation separator work temperature, flying dust can also be after in subsider
Continuous cooling.Import steady flow segment is lengthened 400mm by 500-530 DEG C of two level spiral case cyclone separator operating temperature for low culm.It follows
Loop system is safe and reliable, avoids separating at high temperature because high sodium coal ash fusion temperature low strap carrys out the risk of circulatory system coking.
（5）The utility model had not only maintained fluidisation in bed uniform and stable by aweather indoor addition 0-30% tail flue gas, but also
Excess air coefficient is controlled, lower part anoxic and uniform and stable burning inhibit NOXGeneration；Returning charge, burner hearth are detached by two-stage
The carbon containing fine ash concentration in top is high, and interval laying wall with refractory lining, refracto ensures that about 850 DEG C of upper temp does not reduce uniformly（It is also desulfuration in furnace agent
Optimum working temperature）, the red-hot carbon granule of upper furnace high concentration formd to NOXStrong reducing property condition, and extend height, together
When burner hearth flow temporally more extends about 1s designs, reduction reaction reduces NOXDischarge.
Thus, the utility model is suitable for high sodium coal fuel, high combustion efficiency, and steam temperature is stablized, and burner hearth is not easy coking, returns
Expect that the circulatory system is reliable, heating surface is not easy to stain, NOXIt discharges low（＜ 200mg/m3）, reach minimum discharge convenient for SNCR and SCR,
Effect is preferable.
Description of the drawings
Fig. 1 is the structure diagram of the utility model；
It is identified in figure：The low speed bed burner hearths of 1-, the small blast cap air distribution plates of 2-, 3- equipressure air compartments, 4- feed inlets, 5- pipe layings, 6- are returned
Material mouth, the first waterways of 7-, 8- membrane walls exceed the cold screen of vapour, the second waterways of 9-, 10- coiled pipe low temperature superheaters, 11- two levels
Spiral case cyclone separator, 12-U type valves, 13- subsiders, 14- level-one accelerated sedimentation separators, 15- economizers, 16- air preheats
Device, 17- soot blowers, 18- flue gases add in mouth, 19- spiral ash dischargers.
Specific embodiment
To make the purpose of this utility model, technical solution and advantage clearer, below with reference to this specification attached drawing pair
The utility model is described in further detail.
Embodiment 1：As shown in Figure 1, the high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler of a kind of pure combustion,
It includes low speed bed burner hearth 1, and low speed bed 1 lower section of burner hearth is connected by small blast cap air distribution plate 2 with isobaric air compartment 3, low speed bed
1 lower part of burner hearth is provided with feed pipe 4 and pipe laying 5 and returning charge mouth 6；The outlet turn downlink of low speed bed burner hearth 1 connects the first water cooling
Chamber 7,7 lower part of the first waterway, which is gradually reduced after downlink is turned round, to become larger, and connection level-one accelerated sedimentation separator 14, the level-one adds
The lower curtate of fast settlement separator 14 is connected with subsider 13, and the bottom of the subsider 13 is connect with returning charge mouth 6；Level-one accelerates heavy
The drop 14 top other end of separator is connect with the second waterway 9, the top arrangement coiled pipe cryogenic overheating of second waterway 9
Device 10, the second waterway 9 exports is in series with two level spiral case cyclone separator 11, several groups of economizers 15, air preheaters respectively
16th, fume treatment auxiliary；The bottom of two level spiral case cyclone separator 11 is parallel with spiral ash discharger 19 and U-shaped valve 12, described U-shaped
12 outlet of valve is connect across subsider 13 with low speed bed burner hearth 1.
Further, low speed bed burner hearth 1 is up-small and down-big full film type wall structure, the outlet of low speed bed 1 inside smoke of burner hearth with
Lower side towards the fire is laid with wall with refractory lining, refracto, and the wall with refractory lining, refracto is is arranged at intervals.Temperature measuring point is set every 2 meters on low speed bed burner hearth 1.
Further, the cross section structure form of the first waterway 7 is up big and down small, and top side towards the fire, which is all laid with, defends combustion
Band, in 7 top of the first waterway suspention there is membrane wall to exceed the cold screen 8 of vapour, screen spacing is 500-800mm.
Further, a diameter of 50mm of blast cap of small blast cap air distribution plate 2, a diameter of 4.5-5.2mm of air-permeating hole on blast cap,
Spacing is 70-75mm between adjacent blast cap.
Further, the side towards the fire of level-one accelerated sedimentation separator 14 is laid with scuff-resistant coating.
Further, 13 membrane wall side towards the fire of subsider is exposed.
Further, the second waterway 9 is full film type wall structure, and coiled pipe low temperature superheater 10, institute are disposed in top
It states coiled pipe low temperature superheater 10 and arranges pitch structure form, 9 membrane wall side towards the fire bottom of the second waterway for in-line coarse pitch, big pipe
Portion is laid with scuff-resistant coating, superheater and following laying insulating layer.
Further, two level spiral case cyclone separator 11 be heat insulation-type, a length of 2000~2500mm of import steady flow segment, than one
As steady flow segment increase 400~500 mm, improve ash separating effect.
Further, air preheater 16 for in-line coarse pitch, big pipe arrange pitch structure form, air preheater 16,
Be configured with soot blower 17 for every grade between economizer 15, coiled pipe low temperature superheater 10, air preheater 16 and isobaric air compartment 3 it
Between connected with air hose, on air hose be equipped with flue gas add in mouth 18.
A kind of operating method of the high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler of pure combustion, this method include
Following steps：
A, air is sent to air hose in isobaric air compartment 3, after air preheater 16 is preheating to 120~130 DEG C through small wind
It after the blast cap of cap air distribution plate 2 is evenly distributed, enters in low speed bed burner hearth 1 and forms fluidized wind, with feed pipe 4 and returning charge mouth
The coal grain being sent into 6 burns, and forms flue gas and flows up；
B, low speed bed 1 lower part flue gas flow rate of burner hearth is 3~4m/s, and top flue gas flow rate is 4~4.5m/s, in low speed pool furnace
Flue gas flow in thorax 1 is 6~7s；
C, tail flue gas of the fluidized wind of small blast cap air distribution plate 2 for fresh air incorporation 0~30%；
D, for flue gas after low speed bed burner hearth comes out, temperature is 850~860 DEG C, is entered in the first waterway 7；
E, 7 top flue gas downstream speed of the first waterway is 5~6m/s, and lower part outlet flue gas flow rate is 8m/s, into the
In two waterways 9；
F, flue gas uplink 6~7m/s of flow velocity in the second waterway 9 enters two after the cooling of coiled pipe low temperature superheater 10
Grade spiral case cyclone separator 11 detaches, and the operating temperature of two level spiral case cyclone separator 11 is 500~530 DEG C；
G, it is further dropped from the flue gas after the separation of two level spiral case cyclone separator 11 through economizer 15 and air preheater 16
Enter after temperature after fume treatment auxiliary processing and be discharged into air through chimney；
H, after the separation of two level spiral case cyclone separator 11, uncombusted high sodium flying dust is returned by U-shaped valve 12 and returning charge mouth 6
Hearth combustion is returned, fraction flying dust is discharged by spiral ash discharger 19, is served and is adjusted burner hearth differential pressure.
The operation principle of the utility model is summarized as follows：
High sodium coal fuel from feed inlet 4 add in 1 lower part emulsion zone of burner hearth, by fresh air blend 0-30% tail flue gas into
Row fluid boiling burns, and burns more than 2mm coarse granules in emulsion zone.Fine grained is blown into 1 top dilute-phase zone of burner hearth, during through 6-7s
Between burn after flake hearth-tapping 1.The first waterway 7 is advanced under high-temperature flue gas and is cooled to 650-600 DEG C, after turn on be advanced into second
Waterway 9 is cooled to 530-500 DEG C, after two level spiral case cyclone separator 11 again along enter economizer 15, air preheater 16,
Pass through tail portion Environmental-protecting treater qualified discharge.
Flue gas by accelerating during the first 7 lower part of waterway, after turn on be advanced into the second waterway 9, wherein soot particle because
It is detached for accelerated sedimentation, this part（40-60%）Soot particle is collected into return burner hearth 1 in subsider 13 and burns, and forms first order medium temperature
Detach send-back system.When by two level spiral case cyclone separator 11, wherein soot particle is because cyclone centrifugal power detaches flue gas, this portion
Point（90-95%）Soot particle is collected into standpipe to be burnt by U-shaped 12 part of valve through inclined tube return burner hearth 1, forms the separation of second level medium temperature
Send-back system is partly discharged by spiral ash discharger 19.For the soot particle under not intercepted by second-stage separator, because its grain size is very
It is small, and have the burning time of burner hearth 6-7s, particle substantially can after-flame.
By adding in 0-30% tail flue gas into isobaric air compartment 3, not only maintained fluidisation in bed uniform and stable, but also control is excessive
Air coefficient, lower part anoxic and uniform and stable burning inhibit NOXGeneration；Returning charge is detached by two-stage, 1 top of burner hearth is carbon containing
Fine ash concentration is high, and interval laying wall with refractory lining, refracto ensures that about 850 DEG C of upper temp does not reduce uniformly（It is also desulfuration in furnace agent best effort
Temperature）, the 1 red-hot carbon granule of top high concentration of burner hearth formd to NOXStrong reducing property condition, and extend height, while burner hearth 1
Flow temporally more extends about 1s designs, and reduction reaction reduces NOXDischarge.
Part is not described in detail for the utility model, is the known technology of those skilled in the art of the present technique.Finally illustrate, with
Upper embodiment is merely intended for describing the technical solutions of the present application, but not for limiting the present application, although with reference to preferred embodiment to the utility model
It is described in detail, it will be understood by those of ordinary skill in the art that, the technical solution of the utility model can be repaiied
Change or equivalent replacement, without departing from the objective and range of technical solutions of the utility model, should all cover in the utility model
Right in.
Claims (9)
1. a kind of high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler of pure combustion, it is characterised in that：It includes low speed
Pool furnace thorax（1）, the low speed bed burner hearth（1）Lower section passes through small blast cap air distribution plate（2）With isobaric air compartment（3）Connection, low speed pool furnace
Thorax（1）Lower part is provided with feed pipe（4）And pipe laying（5）And returning charge mouth（6）；Low speed bed burner hearth（1）Outlet turn downlink connection
First waterway（7）, the first waterway（7）Lower part, which is gradually reduced after downlink is turned round, to become larger, and connects level-one accelerated sedimentation separator
（14）, the level-one accelerated sedimentation separator（14）Lower curtate be connected with subsider（13）, the subsider（13）Bottom with
Returning charge mouth（6）Connection；Level-one accelerated sedimentation separator（14）The top other end and the second waterway（9）Connection, second water
Cold chamber（9）Top arrangement coiled pipe low temperature superheater（10）, the second waterway（9）Outlet is in series with two level spiral case cyclonic separation
Device（11）, several groups of economizers（15）, air preheater（16）, fume treatment auxiliary；Two level spiral case cyclone separator（11）'s
Bottom is parallel with spiral ash discharger（19）With U-shaped valve（12）, the U-shaped valve（12）Outlet passes through subsider（13）With it is low speed bed
Burner hearth（1）Connection.
2. the high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler of pure combustion according to claim 1, feature
It is：The low speed bed burner hearth（1）For up-small and down-big full film type wall structure, low speed bed burner hearth（1）Inside smoke outlet it is following to
Fiery face is laid with wall with refractory lining, refracto, and the wall with refractory lining, refracto is is arranged at intervals.
3. the high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler of pure combustion according to claim 1, feature
It is：First waterway（7）Cross section structure form to be up big and down small, top side towards the fire is all laid with wall with refractory lining, refracto, the
One waterway（7）Suspention has membrane wall to exceed the cold screen of vapour in top（8）, screen spacing is 500-800mm.
4. the high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler of pure combustion according to claim 1, feature
It is：The small blast cap air distribution plate（2）The a diameter of 50mm of blast cap, a diameter of 4.5-5.2mm of air-permeating hole on blast cap, adjacent wind
Spacing is 70-75mm between cap.
5. the high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler of pure combustion according to claim 1, feature
It is：The level-one accelerated sedimentation separator（14）Side towards the fire be laid with scuff-resistant coating.
6. the high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler of pure combustion according to claim 1, feature
It is：The subsider（13）Membrane wall side towards the fire is exposed.
7. the high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler of pure combustion according to claim 1, feature
It is：Second waterway（9）For full film type wall structure, coiled pipe low temperature superheater is disposed in top（10）, the snake
Shape pipe low temperature superheater（10）Pitch structure form, the second waterway are arranged for in-line coarse pitch, big pipe（9）Membrane wall side towards the fire bottom
Portion is laid with scuff-resistant coating, superheater and following laying insulating layer.
8. the high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler of pure combustion according to claim 1, feature
It is：The two level spiral case cyclone separator（11）For heat insulation-type, a length of 2000~2500mm of import steady flow segment.
9. the high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler of pure combustion according to claim 1, feature
It is：The air preheater（16）Pitch structure form is arranged for in-line coarse pitch, big pipe, in air preheater（16）, save coal
Device（15）, coiled pipe low temperature superheater（10）Between every grade be configured with soot blower（17）, in air preheater（16）With isobaric wind
Room（3）Between connected with air hose, on air hose be equipped with flue gas add in mouth（18）.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721565754.7U CN207486769U (en) | 2017-11-21 | 2017-11-21 | A kind of high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler of pure combustion |
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|---|---|---|---|
| CN201721565754.7U CN207486769U (en) | 2017-11-21 | 2017-11-21 | A kind of high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler of pure combustion |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107763593A (en) * | 2017-11-21 | 2018-03-06 | 贵州新能源开发投资股份有限公司 | A kind of high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler of pure combustion |
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2017
- 2017-11-21 CN CN201721565754.7U patent/CN207486769U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107763593A (en) * | 2017-11-21 | 2018-03-06 | 贵州新能源开发投资股份有限公司 | A kind of high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler of pure combustion |
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