CN107726285A - A kind of high sodium coal two-stage medium temperature separation recirculating fluidized bed wet steamer of pure combustion - Google Patents
A kind of high sodium coal two-stage medium temperature separation recirculating fluidized bed wet steamer of pure combustion Download PDFInfo
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- CN107726285A CN107726285A CN201711168603.2A CN201711168603A CN107726285A CN 107726285 A CN107726285 A CN 107726285A CN 201711168603 A CN201711168603 A CN 201711168603A CN 107726285 A CN107726285 A CN 107726285A
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- waterway
- burner hearth
- flue gas
- low speed
- high sodium
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- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 title claims abstract description 37
- 229910052708 sodium Inorganic materials 0.000 title claims abstract description 37
- 239000011734 sodium Substances 0.000 title claims abstract description 37
- 239000003245 coal Substances 0.000 title claims abstract description 32
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 28
- 238000000926 separation method Methods 0.000 title claims abstract description 27
- 230000003134 recirculating effect Effects 0.000 title claims abstract description 18
- 239000012528 membrane Substances 0.000 claims abstract description 31
- 238000001816 cooling Methods 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000000428 dust Substances 0.000 claims abstract description 15
- 239000003546 flue gas Substances 0.000 claims description 42
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 41
- 239000004071 soot Substances 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 239000003517 fume Substances 0.000 claims description 6
- 210000000038 chest Anatomy 0.000 claims description 5
- 230000008676 import Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 238000010348 incorporation Methods 0.000 claims description 3
- 238000011017 operating method Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 239000000779 smoke Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 10
- 238000004939 coking Methods 0.000 abstract description 7
- 238000013461 design Methods 0.000 abstract description 6
- 238000013517 stratification Methods 0.000 abstract description 6
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052700 potassium Inorganic materials 0.000 abstract description 5
- 239000011591 potassium Substances 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 208000002925 dental caries Diseases 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 239000002956 ash Substances 0.000 description 15
- 239000002245 particle Substances 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 239000000839 emulsion Substances 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000005243 fluidization Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 230000001603 reducing effect Effects 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/0007—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus with combustion in a fluidized bed
- F22B31/0015—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus with combustion in a fluidized bed for boilers of the water tube type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention discloses a kind of pure high sodium coal two-stage medium temperature separation recirculating fluidized bed wet steamer of combustion, it includes burner hearth, 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；Turn round the first waterway of descending connection for the outlet of burner hearth, and the first waterway bottom becomes big after descending turn is gradually reduced, and connects one-level Accelerated subsidence separator, the lower curtate of one-level Accelerated subsidence separator is connected with subsider, and the bottom of subsider is connected with returning charge mouth；One-level Accelerated subsidence separator top is connected with the second waterway, and the top arrangement membrane wall water cooling shield 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 serious phenomenon of coking dust stratification, achieve preferable effect by setting the first and second two water cooled membrane wall cavitys in furnace outlet.
Description
Technical field
The present invention relates to a kind of CFBB, more particularly to a kind of high sodium coal two-stage medium temperature separation recycle stream of pure combustion
Change bed wet steamer, belong to boiler combustion equipment technical field.
Background technology
At present, for CFBB generally to the quasi- high sodium coal bad adaptability in east area in Xinjiang, the boiler run is general
It is that ginseng burns the high sodium coal in part, and universal coking dust stratification is serious, 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 high heating value, high sodium, potassium, calcium,
Strong coking capacity, strong contamination, but after-flame function admirable of catching fire.It is serious that the high sodium coal that burns mainly will fundamentally solve coking dust stratification
Phenomenon, should strictly control ignition temperature, to the 850-530 DEG C of heating surface most easily stain carry out reduce stain design and avoid sodium,
Potassium high temperature corrosion, therefore very high requirement is proposed to hearth combustion and heating surface heat transfer.
The content of the invention
The technical problem to be solved in the present invention is：There is provided a kind of pure combustion high sodium coal two-stage medium temperature separation recirculating fluidized bed saturation
Steam boiler, it is by setting the first and second two water cooled membrane wall cavitys, the insulation of heating surface inner surface in furnace outlet
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 automatically cleaning
Ability, ignition temperature is strictly controlled, the 850-530 DEG C of heating surface most easily stain reduce staiing and designs and avoid sodium, potassium
High temperature corrosion, solve the serious phenomenon of coking dust stratification, thoroughly solve above-mentioned technical problem.
The technical scheme is that：A kind of high sodium coal two-stage medium temperature separation recirculating fluidized bed wet steamer of pure combustion,
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 bed burner hearth
Bottom is provided with feed pipe and pipe laying and returning charge mouth；Turn round the first waterway of descending connection for the outlet of low speed bed burner hearth, the first water
Cold chamber bottom becomes big after descending turn is gradually reduced, and connects one-level Accelerated subsidence separator, the one-level Accelerated subsidence separator
Lower curtate be connected with subsider, the bottom of the subsider is connected with returning charge mouth；The one-level Accelerated subsidence separator top other end
It is connected with the second waterway, the top arrangement membrane wall water cooling shield of second waterway, the outlet of the second waterway is gone here and there respectively
It is associated with two level spiral case cyclone separator, some groups of economizers, air preheater, fume treatment auxiliaries；Two level spiral case cyclonic separation
The bottom of device is parallel with spiral ash discharger and U-shaped valve, and the U-shaped valve outlet tube is connected through subsider with burner hearth.
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 interval setting.Temperature measuring point is set every 2 meters on low speed bed burner hearth.
First waterway is full film type wall structure, and its cross section structure form is up big and down small, and bottom is gradually reduced, on
Portion's side towards the fire is all exposed, and being suspended in midair in the first waterway top has membrane wall water-cooling screen, a width of 400-600mm of its screen, shields spacing
For 200-400mm.
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 one-level Accelerated subsidence 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 membrane wall water cooling shield, the membrane wall water are disposed with top
Cold shut screen screen spacing is 500-800mm, and scuff-resistant coating is laid in the second waterway membrane wall side towards the fire bottom.
The two level spiral case cyclone separator is heat insulation-type, a length of 2000~2500mm of import steady flow segment.
The air preheater is in-line coarse pitch, big pipe row's pitch structure form, in air preheater, economizer and film
Every grade is configured with soot blower between formula wall water cooling shield, is connected between air preheater and isobaric air compartment with airduct, in airduct
It is provided with flue gas and adds mouth.
A kind of operating method of the high sodium coal two-stage medium temperature separation recirculating fluidized bed wet steamer of pure combustion, this method include
Following steps：
A, air is sent in isobaric air compartment after air preheater is preheating to 120~130 DEG C with airduct, through small blast cap cloth wind
After the blast cap of plate is evenly distributed, enter in low speed bed burner hearth and form fluidized wind, with being sent into feed pipe and returning charge mouth
Coal grain is burnt, and is formed flue gas and is flowed up；
B, low speed bed lower furnace portion flue gas flow rate is 3~4m/s, and top flue gas flow rate is 4~4.5m/s, in low speed bed burner hearth
Flue gas flow be 6~7s；
C, the fluidized wind of small blast cap air distribution plate is the tail flue gas of 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；
E, the first waterway top flue gas downstream speed is 5~6m/s, and lower part outlet flue gas flow rate is 8m/s, into the second water cooling
Intracavitary；
F, the up 6~7m/s of flow velocity of flue gas in the second waterway, the rotation of two level spiral case is entered after the cooling of membrane wall water cooling shield
Wind separator separates, and the operating temperature of two level spiral case cyclone separator is 500~530 DEG C；
G, cigarette is entered after economizer and air preheater further cool from the flue gas after the separation of two level spiral case cyclone separator
After the processing of gas disposal equipment air is discharged into through chimney；
H, after the separation of two level spiral case cyclone separator, uncombusted high sodium flying dust returns to burner hearth by U-shaped valve and returning charge mouth and fired
Burn, fraction flying dust is discharged by spiral ash discharger, plays regulation burner hearth differential pressure.
The beneficial effects of the invention are as follows：Compared with prior art, its advantage is as follows：
The advantage low by playing burning in circulating fluid bed boiler temperature, reduce alkali metal and its compound gasification burst size.
（1）The burner hearth of the present invention is using low speed bed, emulsion zone combustion share height, because high sodium coal calorific value height and the after-flame that catches fire
Function admirable, by increasing pipe laying area 20% and using medium temperature returning charge cooling regulation, ignition temperature can be controlled to be melted in high sodium coal
Below melting property slagging temperature.
（2）For the burner hearth of the present invention using low speed bed, dilute-phase zone combustion share is low, and water-cooling wall area is big so side towards the fire is laid
Wall with refractory lining, refracto, but interval is exposed adjustable, and the default low-intensity wall with refractory lining, refracto in interval is moldable, temperature measuring points is set every 2 meters, according to operation
Temperature determines the amount of destroying.Ignition temperature can be controlled below high sodium coal meltbility slagging temperature, because after medium temperature returning charge enters stove
Need to increase preheating time, so burner hearth flow time to be extended to about 1s designs more.
（3）The present invention is to 850-530 DEG C of heating surface most easily staiing, using the first and second two water cooled membrane wall skies
Chamber, sets up double-sided exposure water-cooling screen, and heating surface area is big.More cavity membrane walls are in flying dust circulation loop, and speed is low but ash concentration
Height, not only enhance heat transfer but also improve automatical cleaning ability.First cavity ash concentration is consistent with burner hearth, and flue gas is descending will not dust stratification.
Second cavity ash concentration is less than the first cavity, and flue gas is up, and cigarette speed improves 1m/s, is not easy dust stratification beneficial to heat transfer, has also installed additional and stretched
Contracting soot blower.
（4）600-650 DEG C of one-level Accelerated subsidence separator work temperature of the present invention, flying dust can also continue to cold in subsider
But.500-530 DEG C of two level spiral case cyclone separator operating temperature, import steady flow segment is lengthened into 400mm for low culm.Cyclic system
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 present invention had both been maintained fluidisation in bed uniform and stable, controlled again by aweather indoor addition 0-30% tail flue gas
Excess air coefficient, bottom anoxic and uniform and stable burning inhibit NOXGeneration；Returning charge, upper furnace are separated by two-stage
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（And desulfuration in furnace agent is optimal
Operating temperature）, the red-hot carbon granule of upper furnace high concentration formd to NOXStrong reducing property condition, and extend height, while stove
Thorax flow temporally more extends about 1s designs, and reduction reaction reduces NOXDischarge.
Thus, the present invention is applicable high sodium coal fuel, high combustion efficiency；Burner hearth is not easy coking, and the returning charge circulatory system is reliable,
Heating surface is not easy to stain；NOXDischarge low（＜ 200mg/m3）, it is easy to SNCR and SCR to reach minimum discharge.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
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- charging apertures, 5- pipe layings, 6- returning charge mouths,
The waterways of 7- first, 8- membrane wall water-cooling screens, the waterways of 9- second, 10- membrane wall water cooling shields, 11- two level spiral cases whirlwind point
From device, 12-U type valves, 13- subsiders, 14- one-level Accelerated subsidence separators, 15- economizers, 16- air preheaters, 17- soot blowings
Device, 18- flue gases add mouth, 19- spiral ash dischargers.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below with reference to this specification accompanying drawing to this hair
It is bright to be described in further detail.
Embodiment 1：As shown in Figure 1, the high sodium coal two-stage medium temperature separation recirculating fluidized bed wet steamer of a kind of pure combustion,
It includes low speed bed burner hearth 1, and the low speed bed lower section of burner hearth 1 is connected by small blast cap air distribution plate 2 with isobaric air compartment 3, low speed bed
The bottom of burner hearth 1 is provided with feed pipe 4 and pipe laying 5 and returning charge mouth 6；Outlet turn the first water cooling of descending connection of low speed bed burner hearth 1
Chamber 7, the bottom of the first waterway 7 become big after descending turn is gradually reduced, and connection one-level Accelerated subsidence separator 14, the one-level adds
The lower curtate of fast settlement separator 14 is connected with subsider 13, and the bottom of the subsider 13 is connected with returning charge mouth 6；One-level accelerates heavy
The drop top other end of separator 14 is connected with the second waterway 9, the top arrangement membrane wall water cooling shield of second waterway 9
10, the second waterway 9 export be in series with respectively two level spiral case cyclone separator 11, some groups of economizers 15, air preheater 16,
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, the U-shaped valve
12 outlets are connected through 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 the low speed bed inside smoke of burner hearth 1 with
Lower side towards the fire is laid with wall with refractory lining, refracto, and the wall with refractory lining, refracto is interval setting.Temperature measuring point is set every 2 meters on low speed bed burner hearth.
Further, the first waterway 7 is full film type wall structure, and its cross section structure form is up big and down small, and bottom is gradual
Reduce, top side towards the fire is all exposed, and being suspended in midair in the top of the first waterway 7 has membrane wall water-cooling screen 8, a width of 400- of its screen
600mm, screen spacing are 200-400mm.
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 one-level Accelerated subsidence separator 14 is laid with scuff-resistant coating.
Further, the membrane wall side towards the fire of subsider 13 is exposed.
Further, the second waterway 9 is full film type wall structure, and membrane wall water cooling shield 10 is disposed with top, described
The screen spacing of membrane wall water cooling shield 10 is 500-800mm, and scuff-resistant coating is laid in the membrane wall side towards the fire bottom of the second waterway 9.
Further, two level spiral case cyclone separator 11 is 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 be in-line coarse pitch, big pipe arrange pitch structure form, air preheater 16,
Every grade is configured with soot blower 17 between economizer 15 and membrane wall water cooling shield 10, air preheater 16 and isobaric air compartment 3 it
Between connected with airduct, on airduct be provided with flue gas add mouth 18.
A kind of operating method of the high sodium coal two-stage medium temperature separation recirculating fluidized bed wet steamer of pure combustion, this method include
Following steps：
A, air is sent in isobaric air compartment 3 after air preheater 16 is preheating to 120~130 DEG C with airduct, through small blast cap cloth
After the blast cap of aerofoil 2 is evenly distributed, enter in low speed bed burner hearth 1 and form fluidized wind, and in feed pipe 4 and returning charge mouth 6
The coal grain of feeding is burnt, and is formed flue gas and is flowed up；
B, the low speed bed bottom flue gas flow rate of burner hearth 1 is 3~4m/s, and top flue gas flow rate is 4~4.5m/s, in low speed bed burner hearth 1
Interior flue gas flow is 6~7s；
C, the fluidized wind of small blast cap air distribution plate 2 is the tail flue gas of 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, the top flue gas downstream speed of the first waterway 7 is 5~6m/s, and lower part outlet flue gas flow rate is 8m/s, into the second water
In cold chamber 9；
F, the up 6~7m/s of flow velocity of flue gas in the second waterway 9, two level spiral case is entered after the cooling of membrane wall water cooling shield 10
Cyclone separator 11 separates, and the operating temperature of two level spiral case cyclone separator 11 is 500~530 DEG C；
G, from the flue gas after the separation of two level spiral case cyclone separator 11 after economizer 15 and air preheater 16 further cool
After into fume treatment auxiliary processing air is discharged into through chimney；
H, after the separation of two level spiral case cyclone separator 11, uncombusted high sodium flying dust returns to stove by U-shaped valve 12 and returning charge mouth 6
Thorax is burnt, and fraction flying dust is discharged by spiral ash discharger 19, plays regulation burner hearth differential pressure.
The operation principle of the present invention is summarized as follows：
High sodium coal fuel adds the bottom emulsion zone of burner hearth 1 from charging aperture 4, is flowed by fresh air blending 0-30% tail flue gas
Change Boiling Combustion, burnt more than 2mm coarse granules in emulsion zone.Fine grained is blown into the top dilute-phase zone of burner hearth 1, is fired through the 6-7s times
Flake hearth-tapping 1 after burning.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 the second water cooling
Chamber 9 is cooled to 530-500 DEG C, passes through again along economizer 15, air preheater 16 is entered after two level spiral case cyclone separator 11
Afterbody Environmental-protecting treater qualified discharge.
Flue gas by accelerating during the first 7 bottom of waterway, after turn on be advanced into the second waterway 9, wherein soot particle because
Separated for Accelerated subsidence, this part（40-60%）Soot particle, which is collected into subsider 13, returns to hearth combustion, forms first order medium temperature
Separate send-back system.When by two level spiral case cyclone separator 11, wherein soot particle is because cyclone centrifugal power separates flue gas, this portion
Point（90-95%）Soot particle is collected into standpipe returns to hearth combustion by the U-shaped part of valve 12 through inclined tube, forms the separation of second level medium temperature
Send-back system, partly discharged by spiral ash discharger 19.For the soot particle under not intercepted by second-stage separator, because its particle diameter is very
It is small, there is burner hearth 6-7s burning time again, particle substantially can after-flame.
By adding 0-30% tail flue gas into isobaric air compartment 3, both maintained fluidisation in bed uniform and stable, controlled again excessive
Air coefficient, bottom anoxic and uniform and stable burning inhibit NOXGeneration；Returning charge is separated by two-stage, the top of burner hearth 1 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（And desulfuration in furnace agent best effort
Temperature）, the red-hot carbon granule of top high concentration of burner hearth 1 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 by the present invention, is the known technology of those skilled in the art of the present technique.Finally illustrate, the above is real
Example is applied to be merely illustrative of the technical solution of the present invention and unrestricted, although having been carried out specifically to the present invention with reference to preferred embodiment
It is bright, it will be understood by those within the art that, technical scheme can be modified or equivalent substitution, and
The objective and scope of technical solution of the present invention are not departed from, it all should cover among scope of the presently claimed invention.
Claims (10)
- A kind of 1. high sodium coal two-stage medium temperature separation recirculating fluidized bed wet steamer 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）Bottom is provided with feed pipe（4）And pipe laying（5）And returning charge mouth（6）；Low speed bed burner hearth（1）Outlet turn round descending connection First waterway（7）, the first waterway（7）Bottom becomes big after descending turn is gradually reduced, and connects one-level Accelerated subsidence separator （14）, the one-level Accelerated subsidence separator（14）Lower curtate be connected with subsider（13）, the subsider（13）Bottom with Returning charge mouth（6）Connection；One-level Accelerated subsidence separator（14）The top other end and the second waterway（9）Connection, second water Cold chamber（9）Top arrangement membrane wall water cooling shield（10）, the second waterway（9）Outlet is in series with two level spiral case cyclone separator （11）, some groups of economizers（15）, air preheater（16）, fume treatment auxiliary；Two level spiral case cyclone separator（11）Bottom Portion is parallel with spiral ash discharger（19）With U-shaped valve（12）, the U-shaped valve（12）Outlet passes through subsider（13）With low speed pool furnace Thorax（1）Connection.
- 2. the high sodium coal two-stage medium temperature separation recirculating fluidized bed wet steamer of pure combustion according to claim 1, its 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 interval setting.
- 3. the high sodium coal two-stage medium temperature separation recirculating fluidized bed wet steamer of pure combustion according to claim 1, its feature It is：First waterway（7）For full film type wall structure, its cross section structure form is up big and down small, and bottom is gradually reduced, on Portion's side towards the fire is all exposed, the first waterway（7）Suspention has membrane wall water-cooling screen in top（8）, a width of 400-600mm of its screen, Screen spacing is 200-400mm.
- 4. the high sodium coal two-stage medium temperature separation recirculating fluidized bed wet steamer of pure combustion according to claim 1, its 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 wet steamer of pure combustion according to claim 1, its feature It is：The one-level Accelerated subsidence 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 wet steamer of pure combustion according to claim 1, its 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 wet steamer of pure combustion according to claim 1, its feature It is：Second waterway（9）For full film type wall structure, membrane wall water cooling shield is disposed with top（10）, the membrane type Wall water cooling shield（10）Screen spacing is 500-800mm, the second waterway（9）Scuff-resistant coating is laid in membrane wall side towards the fire bottom.
- 8. the high sodium coal two-stage medium temperature separation recirculating fluidized bed wet steamer of pure combustion according to claim 1, its 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 wet steamer of pure combustion according to claim 1, its 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）With membrane wall water cooling shield（10）Between every grade be configured with soot blower（17）, in air preheater（16）With isobaric air compartment （3）Between connected with airduct, on airduct be provided with flue gas add mouth（18）.
- 10. recirculating fluidized bed wet steamer is separated according to any high sodium coal two-stage medium temperatures of described pure combustion of claim 1-9 Operating method, it is characterised in that：This method comprises the following steps：A, air is through air preheater（16）After being preheating to 120~130 DEG C, isobaric air compartment is sent to airduct（3）In, through small wind Cap air distribution plate（2）Blast cap evenly distributed after, enter low speed bed burner hearth（1）Middle formation fluidized wind, with feed pipe（4）And Returning charge mouth（6）The coal grain of middle feeding is burnt, and is formed flue gas and is flowed up；B, low speed bed burner hearth（1）Bottom flue gas flow rate is 3~4m/s, and top flue gas flow rate is 4~4.5m/s, in low speed bed burner hearth （1）Interior flue gas flow is 6~7s；C, small blast cap air distribution plate（2）Fluidized wind for fresh air incorporation 0~30% tail flue gas；D, for flue gas after low speed bed burner hearth comes out, temperature is 850~860 DEG C, enters the first waterway（7）It is interior；E, the first waterway（7）Top flue gas downstream speed is 5~6m/s, and lower part outlet flue gas flow rate is 8m/s, into second Waterway（9）It is interior；F, the second waterway（9）Up 6~the 7m/s of flow velocity of interior flue gas, through membrane wall water cooling shield（10）Enter two level after cooling Spiral case cyclone separator（11）Separation, two level spiral case cyclone separator（11）Operating temperature be 500~530 DEG C；G, from two level spiral case cyclone separator（11）Flue gas after separation is through economizer（15）And air preheater（16）Further Enter after cooling after fume treatment auxiliary processing and be discharged into air through chimney；H, through two level spiral case cyclone separator（11）After separation, uncombusted high sodium flying dust passes through U-shaped valve（12）And returning charge mouth（6） Hearth combustion is returned to, fraction flying dust passes through spiral ash discharger（19）Discharge, play regulation burner hearth differential pressure.
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