CN107763593A - 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 PDF

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Publication number
CN107763593A
CN107763593A CN201711166166.0A CN201711166166A CN107763593A CN 107763593 A CN107763593 A CN 107763593A CN 201711166166 A CN201711166166 A CN 201711166166A CN 107763593 A CN107763593 A CN 107763593A
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CN
China
Prior art keywords
waterway
burner hearth
flue gas
superheated steam
low speed
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CN201711166166.0A
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Chinese (zh)
Inventor
王志中
杨志伟
杨博铭
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Guizhou New Energy Development Investment Ltd By Share Ltd
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Guizhou New Energy Development Investment Ltd By Share Ltd
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Priority to CN201711166166.0A priority Critical patent/CN107763593A/en
Publication of CN107763593A publication Critical patent/CN107763593A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/22—Methods of steam generation characterised by form of heating method using combustion under pressure substantially exceeding atmospheric pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22G—SUPERHEATING OF STEAM
    • F22G1/00—Steam superheating characterised by heating method
    • F22G1/02—Steam superheating characterised by heating method with heat supply by hot flue gases from the furnace of the steam boiler
    • 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
    • F23C10/28—Control devices specially adapted for fluidised bed, combustion apparatus
    • F23C10/30—Control devices specially adapted for fluidised bed, combustion apparatus for controlling the level of the bed or the amount of material in the bed
    • F23C10/32—Control devices specially adapted for fluidised bed, combustion apparatus for controlling the level of the bed or the amount of material in the bed by controlling the rate of recirculation of particles separated from the flue gases
    • 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 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F23C9/06—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for completing 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 
    • F23C2202/00—Fluegas recirculation
    • F23C2202/30—Premixing fluegas with combustion air

Abstract

The invention discloses a kind of pure high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler 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 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 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

A kind of high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler of pure combustion
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 superheated steam boiler, 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, and 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 Solve coking dust stratification serious phenomenon, should strictly control ignition temperature, carrying out reduction to the 850-530 DEG C of heating surface most easily stain is stained with Dirt designs and avoided sodium, potassium high temperature corrosion, therefore proposes very high requirement 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 overheat 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 superheated steam boiler 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 coiled pipe low temperature superheater of second waterway, the second waterway outlet difference It is in series with two level spiral case cyclone separator, some groups of economizers, air preheater, fume treatment auxiliaries；Two level spiral case whirlwind point Bottom from device is parallel with spiral ash discharger and U-shaped valve, and the U-shaped valve outlet tube is connected through subsider with low speed bed 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.
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 its 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 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 coiled pipe low temperature superheater, the coiled pipe are disposed with top Low temperature superheater is in-line coarse pitch, big pipe row's pitch structure form, and the second waterway membrane wall side towards the fire bottom is laid with anti- Grind layer, superheater and following laying heat-insulation layer.
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, snake Every grade is configured with soot blower between shape pipe low temperature superheater, is connected between air preheater and isobaric air compartment with airduct, in wind Pipe 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 superheated steam boiler 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, two level spiral case is entered after the cooling of coiled pipe low temperature superheater Cyclone 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：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 be spaced exposed adjustable.The default low-intensity wall with refractory lining, refracto in interval is moldable, temperature measuring point 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 cavitys Design.The insulation isolation of heating surface inner surface, in flying dust circulation loop, ash concentration is high, both increases for more cavity membrane walls and heating surface Strong heat transfer improves automatical cleaning ability again.First cavity ash concentration is consistent with burner hearth, flue gas it is descending will not dust stratification, avoid sodium, Potassium high temperature corrosion.Second cavity ash concentration is less than the first cavity, and flue gas is up, and cigarette speed improves 1m/s, is conducted heat beneficial to coiled pipe.Cause To have plenty of space, coiled pipe uses the more pipeloop coarse pitches of in-line（S2）, big pipe row spacing（S1）, dust stratification bridging is not easy, and install additional Telescopic 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 applied to high sodium coal fuel, and high combustion efficiency, steam temperature is stable, and burner hearth is not easy coking, and returning charge follows Loop system is reliable, and heating surface is not easy to stain, NOXDischarge low（＜ 200mg/m3）, it is easy to SNCR and SCR to reach minimum discharge, effect Preferably.
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 walls exceed the cold screen of vapour, the waterways of 9- second, 10- coiled pipe low temperature superheaters, 11- two level spiral cases Cyclone separator, 12-U type valves, 13- subsiders, 14- one-level Accelerated subsidence separators, 15- economizers, 16- air preheaters, 17- soot blowers, 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 superheated steam boiler 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 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, some 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 The outlet of valve 12 is 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 1.
Further, the cross section structure form of the first waterway 7 is up big and down small that top side towards the fire, which is all laid with, defends combustion Band, in the top of the first waterway 7 suspention there is membrane wall to exceed the cold screen 8 of vapour, its 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 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 coiled pipe low temperature superheater 10, institute are disposed with top State coiled pipe low temperature superheater 10 and arrange pitch structure form, the membrane wall side towards the fire bottom of the second waterway 9 for in-line coarse pitch, big pipe Portion is laid with scuff-resistant coating, superheater and following laying heat-insulation layer.
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, coiled pipe low temperature superheater 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 superheated steam boiler 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 snail is entered after the cooling of coiled pipe low temperature superheater 10 Shell 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 is collected into return burner hearth 1 in subsider 13 and burnt, and 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 to be burnt by the U-shaped part of valve 12 through inclined tube return burner hearth 1, 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)

  1. A kind of 1. 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）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 coiled pipe low temperature superheater（10）, the second waterway（9）Outlet is in series with two level spiral case cyclonic separation Device（11）, some 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. 2. the high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler 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. 3. the high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler of pure combustion according to claim 1, its 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）, its screen spacing is 500-800mm.
  4. 4. the high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler 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. 5. the high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler 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. 6. the high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler of pure combustion according to claim 1, its feature It is：The subsider（13）Membrane wall side towards the fire is exposed.
  7. 7. the high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler of pure combustion according to claim 1, its feature It is：Second waterway（9）For full film type wall structure, coiled pipe low temperature superheater is disposed with 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 heat-insulation layer.
  8. 8. the high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler 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. 9. the high sodium coal two-stage medium temperature separation recirculating fluidized bed superheated steam boiler 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）, 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 airduct, on airduct be provided with flue gas add mouth（18）.
  10. 10. recirculating fluidized bed superheated steam boiler 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 coiled pipe low temperature superheater（10）Enter two after cooling Level 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.
CN201711166166.0A 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 Pending CN107763593A (en)

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