CN109028045A - The anti-high sodium coal combustion of one kind stains circulating fluidized bed boiler and releasing pollution discharge treatment method - Google Patents
The anti-high sodium coal combustion of one kind stains circulating fluidized bed boiler and releasing pollution discharge treatment method Download PDFInfo
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- CN109028045A CN109028045A CN201810603271.4A CN201810603271A CN109028045A CN 109028045 A CN109028045 A CN 109028045A CN 201810603271 A CN201810603271 A CN 201810603271A CN 109028045 A CN109028045 A CN 109028045A
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- flue gas
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- phase zone
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- 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
- F23C10/06—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 the circulating movement being promoted by inducing differing degrees of fluidisation in different parts of the bed
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- 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
Abstract
The anti-high sodium coal combustion of one kind stains circulating fluidized bed boiler and releasing pollution discharge treatment method, burner hearth is equipped in the boiler, burner hearth is divided into concentrated phase area and dilute-phase zone, at least two fin panel casing is set in dilute-phase zone, it misplaces parallel between all fin panel casings and then dilute-phase zone is divided into serpentine flow path, the furnace outlet of dilute-phase zone is connected to separator inlet, and the flue-gas temperature of the furnace outlet of dilute-phase zone is 520 DEG C or less；Deashing device is not equipped on the fin panel casing adjacent with concentrated phase area, deashing device includes deashing component and transmission component, transmission component drives deashing component to pump on fin panel casing, elastic metallic yarn is equipped in deashing component, elastic metallic yarn is laterally arranged along the width direction of fin panel casing and is bonded with the wall surface of fin panel casing.The present invention can solve the problem of high sodium coal combustion stains by above-mentioned boiler.
Description
Technical field
The invention belongs to circulating fluidized bed technique fields, and in particular to a kind of anti-high sodium coal combustion contamination recirculating fluidized bed pot
Furnace and releasing pollution discharge treatment method.
Background technique
The coal resources in Xinjiang account for the 2/5 of Chinese coal gross reserves, up to 2.19 trillion tons, rank first in the whole country.And the whole district
The 95% of total resources concentrates on quasi- east, spits the ground such as Kazakhstan.It is 213,600,000,000 tons that only eastern Junggar coalfield, which has verified coal resources reserves, Sha Er
It is 90,000,000,000 tons that coal resources reserves have been verified in lake coalfield.Quasi- east and the lake Sha Er coal are in volatile matter high (30% or more), calorific value
Deng, ash content few (10% or less), sulfur content low (0.2~0.3%) the advantages that, but sodium content is high in coal (is higher than 2% in general coal ash
Referred to as high sodium coal), there are serious slagging and fouling characteristics.
Slagging and fouling characteristics refer to high sodium coal particle in combustion, and sodium salt can all be discharged and be deposited with gas phase in ash
It is in flue gas.Condensation effects occur when gas phase sodium salt touches temperature lower heating surface and are gathered in tube surface, and inhale
Ultra-fine ash in attached flue gas forms contamination internal layer, and then with the continuous condensation of gas phase sodium salt on the boiler for the high sodium coal that burns
It with the fly ash granule in capture flue gas, is constantly grown so that staiing layer, causes tube wall to stain layer and thicken, Landfill covering is entirely managed
Wall, or even entire heating surface will appear " bridging " phenomenon.The contamination layer is very rigid, and conventional boiler soot-blowing cannot be removed,
In this way convection heating surface heat-transfer effect will sharp fall, directly influence the long-term safety stable operation of boiler.
Since early stage is domestic inadequate to the understanding for the high sodium coal that burns, and lack engineering operation experience, in boiler design and fortune
It is treated on row by common coal quality, so that the boiler that active service puts into operation tail portion convection heating surface bonding occurred after using high sodium coal
Property dust stratification Severe blockage and the case where by forced-stopping machine.Logical inquiry pertinent literature and practical investigation discovery: boiler mainly bonds
Property dust stratification mainly concentrates the convection heating surfaces such as high and low temperature superheater, reheater section, tail portion economizer, air preheater.It is sent out by analysis
Existing, these heating surface flue-gas temperature regions are at 700 DEG C hereinafter, condensing section in sodium vapor.
The burning of high sodium coal is utilized at present mainly to use and mixes the weak coal of burning contamination or uses additive.This control
Method processed can only slow down contamination, and the sodium compound steam in coal can condense on heated surface bundle eventually, can not fundamentally solve
Certainly problem.When outer coal mixed-fuel burning proportion is excessive, the demand of outer coal is larger, but is limited by traffic condition, and fortune has been significantly greatly increased
Row cost.Additive also there is a problem of same.The extensive efficiently pure burning for limiting quasi- east and the lake Sha Er coal utilizes, and causes big
Amount cost of winning it is low, combustion activity is good, low pollution, low emission high sodium coal cannot utilize well.Also have and utilize change pot
Furnace structure mode is to slow down the method for caking property dust stratification.Method that there are mainly two types of:
1, flue gas recirculation mode, it is " a kind of to reduce high sodium coal using flue gas recirculation and stain active dress disclosed in the prior art
Set " the high sodium coal contamination of the middle high-temperature flue gas reduction using the region behind cold flue gas chilling screen bottom or screen is active, and is attached to it
In fly ash granule, thus the problems such as avoiding or mitigate the contamination of tail portion convection heating surface appearance, abrasion and corrosion, this method is main
There are problems that flue gas undercompounding and flue-gas temperature cannot integrally reduce the freezing point of sodium salt, the sodium vapor part in flue gas
Being attached on grey fly but encountering the lower heating surface of temperature also has caking property, also will form cohesiveness dust stratification.Therefore this method is only
Contamination problems, which can be mitigated, not can solve problem.
2, increase the mode of low wall temperature heat exchanger, " a kind of low high sodium coal combustion of wall temperature heat-transfer surface solution disclosed in the prior art
Low wall temperature heat exchange area is set before the heat convection region of boiler in the system that burning is stain ", and burner hearth flue gas is by whirlwind point
After device, using low wall temperature heat-transfer surface low-temperature heat exchange, solidification is precipitated in the sodium salt in flue gas.Part sodium can only be precipitated in this method
Salt, so that a large amount of gaseous state sodium salt can not solidify when passing through the device, what part was precipitated may exist with liquid,
The sodium salt of liquid captures thin flying dust, equally has contamination.This method can only also mitigate heated surface at the end of boiler contamination.Not
It can fundamentally solve the problems, such as.
It not can solve problem based on can only suitably mitigate contamination problems in the prior art, it is necessary to which providing one kind can be with
Solve the scheme that high sodium coal combustion stains.
Summary of the invention
Circulating fluidized bed boiler is stain the technical problem to be solved by the invention is to provide a kind of anti-high sodium coal combustion and is prevented
Processing method is stain, can solve the problem of high sodium coal combustion stains, prevents from reducing convection heating surface heat transfer effect because staiing layer
The case where fruit, occurs, and is further ensured that the long-term safety stable operation of boiler.
The technical solution adopted by the present invention to solve the technical problems is:
The anti-high sodium coal combustion of the present invention stains circulating fluidized bed boiler, including burner hearth, air compartment, separator and back-end ductwork, institute
Burner hearth is stated equipped with coal feeding hole, the air compartment, burner hearth, separator, back-end ductwork are sequentially communicated；
The burner hearth is divided into concentrated phase area and dilute-phase zone, and the concentrated phase area is located at lower furnace portion, and the dilute-phase zone is located on burner hearth
Portion, at least provided with 2 fin panel casings in the dilute-phase zone, dislocation is parallel and then in dilute-phase zone between adjacent fin panel casing
Serpentine flow path is formed, the furnace outlet of the dilute-phase zone is connected to separator inlet, the furnace outlet of the dilute-phase zone
Flue-gas temperature is 520 DEG C or less；
Deashing device is not equipped on the fin panel casing adjacent with concentrated phase area, the deashing device includes deashing component and transmission
Component, the transmission component drive deashing component to pump on fin panel casing, set in the deashing component
Flexible wire, the elastic metallic yarn is laterally arranged along the width direction of fin panel casing and the wall with fin panel casing
Face paste is closed.
By theoretical and experimental study discovery, heating surface occurs to stain phenomenon to be that flue-gas temperature and wall temperature of heated surface are made jointly
Result.The effect of smoke temperature is so that sodium compound is precipitated (with liquid or gaseous form presence) from coal or is not precipitated.Sodium
Close whether object stains heating surface depending on sodium compound condensation cure process.By the discovery, further research, which obtains, works as flue gas
Temperature is lower than 520 DEG C, and sodium compound all has been condensed in flue gas, no longer steams at this time containing sodium metallic compound in flue gas
Gas, the heating surface for encountering lower temperature will not form the cohesiveness dust stratification being difficult to clean off.Therefore this programme is by improving burner hearth
The flue-gas temperature of furnace outlet is dropped to interior clever structure 520 DEG C hereinafter, in turn all by sodium compound in tail flue gas
It has been condensed, flue gas can be effectively prevented and stain boiler room back-end surfaces etc., and then bring security risk.Together
When, since flue-gas temperature of the high sodium coal after the burning of concentrated phase area is up to 800 DEG C~950 DEG C, in order to make the cigarette of furnace outlet
Temperature degree drop to 520 DEG C hereinafter, the present invention using being arranged at least two fin panel casing in dilute-phase zone, and then by dilute phase zoning
It is divided into serpentine flow path, realizes more backhaul coolings, can more efficiently cool down.
Furthermore due to being cooled down in dilute-phase zone to flue gas, therefore condenses sodium compound and be all collected at fin panel casing
On, the present invention is arranged deashing device, utilizes deashing device for the cohesiveness dust stratification cleared up on fin panel casing much sooner
In elastic metallic yarn on fin panel casing pumping come timely deashing.
Elastic metallic steel wire can be made of 316L stainless steel wire drawing, and ash-removal effect can be improved in elasticity and toughness.
Preferably, 3 fin panel casings are equipped in the dilute-phase zone, the serpentine flow path in the dilute-phase zone is divided into
Three flue gas backhauls, the corresponding fin panel casing of each flue gas backhaul；
Wherein, the flue gas mean temperature of the first flue gas backhaul is 750 DEG C, flue gas flow rate 3.5m/s；
The flue gas mean temperature of second flue gas backhaul is 600-650 DEG C, flue gas flow rate 4m/s；
The flue gas mean temperature of third flue gas backhaul is 520-550 DEG C, flue gas flow rate 3m/s.
It is consumed etc. from the long-pending accounting and boiler outer dimension with back-end surfaces of furnace heating surface, land occupation and boiler totality steel comprehensive
Conjunction factor considers that it is optimal that three fin panel casings, which are arranged,.Control different temperature in three flue gas backhauls, can more added with
Effect ground condenses sodium vapor.Wherein, the second flue gas backhaul processing heat exchange and sodium vapor condense most frequent region, control low flow velocity
It is beneficial to sodium vapor condensation.
Flue-gas temperature in each backhaul is dropped into above-mentioned preset temperature in order to realize, according to boiler gross tonnage and membrane type
The fin panel casing of the quantity selection appropriate size of water-cooling wall.
Preferably, the deashing component further includes fixing element and pulley, and the elastic metallic yarn is fixed on fixed member
On part, the fixing element is fixedly connected with pulley；
The transmission component includes driving element, actuated element and pulley track, and the actuated element includes power axle, passes
Driving wheel and transmission steel wire；The driving element is connect with actuated element, and the power axle penetrates driving wheel, the transmission steel
Silk winding driving wheel and pulley, the pulley are arranged on pulley track.
Preferably, the fin panel casing is made of several heat exchange pipelines and band steel, and the band steel is set to two heat exchange
Between pipeline；
Cooling medium in the heat exchange pipeline is the saturated water in drum, and the temperature of the cooling medium is lower than 400 DEG C.
Preferably, the width of the band steel and the radius of heat exchange pipeline are equal.The width of band steel and the radius of heat exchange pipeline
Exchange capability of heat is stronger when equal, while deashing is also more convenient.
Preferably, the concentrated phase area is equipped with abrasionproof fin pipe laying, and the abrasionproof fin pipe laying is with 12~15 ° of tilt angle
Setting, the abrasionproof fin pipe laying it is lateral, longitudinal away from for 100mm~150mm.The abrasionproof fin for selecting heat transfer coefficient high buries
Technique in Boiler Membrane Water Cooled Wall area can be greatly reduced in pipe, reduce boiler steel consumption and occupied area, and abrasionproof fin pipe laying is direct
It is washed away by high temperature bed material.It directly exchanges heat with flue gas, improves pipe laying heat transfer coefficient, it can be ensured that the enough heating surfaces of boiler.
Preferably, convection heating surface, economizer and air preheater are additionally provided in the back-end ductwork, flue gas passes sequentially through stream
Heating surface, economizer and air preheater；
It is additionally provided with deduster and air-introduced machine between the back-end ductwork and chimney, the outlet of the back-end ductwork and deduster
Input port connection, the outlet of the deduster are connected to the input port of air-introduced machine, and the outlet and chimney of the air-introduced machine connect
It is logical.
On the other hand, the present invention also provides the releasing pollution discharge treatment method of above-mentioned boiler, include the following steps:
(1): high sodium coal is sent into burner hearth by coal feeding hole；
(2): aweather chamber ventilated, and the high sodium coal that burns in burner hearth concentrated phase area；
(3): the sodium in coal enters flue gas after burning distillation, and gradually condensation is precipitated in fin panel casing in membrane wall backhaul
On, flying dust is attached on fin panel casing；
(4): the deashing device on starting fin panel casing, the elastic metallic yarn of deashing device carry out up and down on fin panel casing
It moves back and forth, cleans up the cohesiveness dust stratification on fin panel casing；
Wherein, the flue gas that high sodium coal combustion generates enters dilute-phase zone by concentrated phase area, the serpentine flow formed along fin panel casing
Channel flowing cooling, and the flue-gas temperature of the furnace outlet of dilute-phase zone is made to be 520 DEG C or less；
(5): the flue gas of the furnace outlet of dilute-phase zone is successively arranged to separator, back-end ductwork.
Preferably, 3 fin panel casings are equipped in the dilute-phase zone, the serpentine flow path in the dilute-phase zone is divided into
Three flue gas backhauls, the corresponding fin panel casing of each flue gas backhaul；
Wherein, the flue gas mean temperature of the first flue gas backhaul is 750 DEG C；
The flue gas mean temperature of second flue gas backhaul is 600-650 DEG C；
The flue gas mean temperature of third flue gas backhaul is 520-550 DEG C.
Preferably, the flue gas flow rate of the first flue gas backhaul is 3.5m/s, the flue gas flow rate of the second flue gas backhaul
For 4m/s, the flue gas flow rate of the third flue gas backhaul is 3m/s.
Compared with prior art, the present invention has the following advantages:
1, the present invention realizes that more backhaul coolings drop to the flue-gas temperature at furnace outlet by the way that fin panel casing is arranged
520 DEG C hereinafter, simultaneously it has been investigated that when flue-gas temperature be lower than 520 DEG C, sodium compound all has been condensed in flue gas, this
When flue gas in no longer contain sodium metal compound vapor, the heating surface for encountering lower temperature will not form cohering of being difficult to clean off
Property dust stratification.Therefore the present invention by improvement burner hearth in clever structure by the flue-gas temperature of furnace outlet drop to 520 DEG C with
Under, flue gas contamination problems can be efficiently solved.Usual circulating sulfuration boiler hearth temperature is in 800 DEG C~900 DEG C sections.Burner hearth
Outlet temperature is 650 DEG C~850 DEG C, and the present invention is dropped to the flue-gas temperature at furnace outlet by breaking through conventional means
520 DEG C hereinafter, reach effect outstanding, and guarantee the normal operation of boiler simultaneously.Exactly because the generation for staiing phenomenon contains
Condensation effects occur for the heating surface that sodium metal compound vapor encounters lower temperature and the cohesiveness dust stratification that is formed, and at heating surface
Bend is more, narrow space, is unfavorable for cleaning, and the present invention is based on problems of the prior art, exactly sharp using reverse thinking
The principle that condensation effects occur for low temperature is met with containing sodium metal compound vapor, burner hearth is flowed out before flue gas is passed to heating surface
Just the sodium compound in flue gas is all condensed out before outlet, so that the flue gas flowed out at furnace outlet no longer contains sodium gold
Belong to compound vapor, and then solves the problems, such as cohesiveness dust stratification on heating surface.
2, it due to cooling down in dilute-phase zone to flue gas, therefore condenses sodium compound and is all collected on fin panel casing, this
Invention pumping come timely deashing on fin panel casing using the elastic metallic yarn in deashing device, thoroughly solves
The problem of recirculating fluidized bed tail portion heat convection cohesiveness dust stratification, such that boiler is safe and stable, continuous operation, increases pot
Furnace operation duration improves boiler effective rate of utilization.It is irregular that condensation sodium compound gathers on fin panel casing, and then is led
The wall surface of cause fin panel casing is uneven and wall surface state is not unalterable, elastic metallic used in the present invention
Silk can be fitted closely based on its elasticity and toughness under any state with fin panel casing, can be more convenient and more
Add the cohesiveness dust stratification effectively cleared up on fin panel casing；In addition, the back-end ductwork of boiler is snakelike, built-in bundled tube pair
It is big to flow heating surface cohesiveness dust stratification cleaning difficulty, and is easy blocking channel, and the present invention passes through fin panel casing and elastic metallic
The cooperation of silk realizes that purge mode is simple, and ash-removal effect is good, and cleaning efficiency reaches 99%.
3, by more backhaul smoke corridors, hearth combustion smoke temperature is reduced, inhibits the generation of NOx, realizes low nitrogen burning, is reduced
Pollutant blowdown.
Detailed description of the invention
Fig. 1 is that the anti-high sodium coal combustion of the present invention stains the structural schematic diagram of circulating fluidized bed boiler embodiment；
Fig. 2 is the film water cold wall structure schematic diagram with deashing device；
Fig. 3 is the fin panel casing sectional schematic diagram with deashing device；
In figure: 1- air compartment, the concentrated phase area 2-, 3- pipe laying, 4- coal feeding hole, 5-the first fin panel casings, 6- hearth wall, the second membrane type of 7-
Water-cooling wall, 8- deashing device, 9- third fin panel casing, 10- furnace outlet, 11- separator, 12- material returning device, 13- convection current by
Hot face, 14- economizer, 15- air preheater, 16- deduster, 17- air-introduced machine, 18- chimney, 71- heat exchange pipeline, 72- band steel, 73-
Fin panel casing header, 81- deashing component, 811- elastic metallic yarn, 812- fixing element I, 813- fixing element II, 814- are sliding
Wheel, 82- transmission component, 821- driving element, 822- power axle, 823- driving wheel, 824- are driven steel wire, and 825- slides rail
Road, 20- fin panel casing, 21- dilute-phase zone.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and embodiments.
Referring to Fig.1, a kind of anti-high sodium coal combustion stains circulating fluidized bed boiler, including air compartment 1, burner hearth, 11 and of separator
Back-end ductwork, the burner hearth are equipped with coal feeding hole 4, and the burner hearth is divided into positioned at the concentrated phase area 2 of lower part and superposed
Dilute-phase zone 21, the back-end ductwork is interior to be equipped with convection heating surface 13, economizer 14 and air preheater 15, the back-end ductwork and cigarette
Deduster 16 and air-introduced machine 17 are equipped between chimney 18；
The air compartment 1 is connected to the concentrated phase area 2 of burner hearth, and the furnace outlet 10 of the dilute-phase zone 21 and the entrance of separator 11 connect
Logical, the dust-exhausting port of the separator 11 connects material returning device 12 by pipeline, and the material returning device 12 connects burner hearth by feed back pipe
The exhanst gas outlet of concentrated phase area 2, the separator 11 is connected to the entrance of back-end ductwork, the outlet of the back-end ductwork and dedusting
The input port of device 16 is connected to, and the outlet of the deduster 16 is connected to the input port of air-introduced machine 17, the row of the air-introduced machine 17
Outlet is connected to chimney 18, therefore high sodium coal enters burner hearth by coal feeding hole 4, and suspend in burner hearth combustion with the air from air compartment 1
It burns, the sodium compound in coal is sublimed into sodium compound steam in burner hearth concentrated phase area 2, and incorporates in high-temperature flue gas, high-temperature flue gas
Separator 11 is entered by burner hearth dilute-phase zone 21, then successively flows to convection heating surface from the flue gas that separator 11 comes out
13, economizer 14, air preheater 15, deduster 16 and air-introduced machine 17, most heel row is to chimney 18.
In the present embodiment, abrasionproof fin pipe laying 3 is equipped in the concentrated phase area 2 of the burner hearth, the abrasionproof fin pipe laying 3 is with 12
~15 ° of tilt angle setting, the abrasionproof fin pipe laying 3 it is lateral, longitudinal away from for 100mm~150mm.
In the present embodiment, be equipped with 3 fin panel casings 20 in the dilute-phase zone 21 of the burner hearth, all fin panel casings 20 it
Between misplace parallel and then dilute-phase zone 21 be divided into serpentine flow path, cooled down using fin panel casing 20 to flue gas, made
The flue-gas temperature of the furnace outlet 10 of dilute-phase zone 21 is 520 DEG C or less, wherein being close to the fin panel casing 20 of concentrated phase area 2 is the
One fin panel casing 5, the fin panel casing adjacent with concentrated phase area is not the second fin panel casing 7 and third fin panel casing 9, institute
It states and is equipped with deashing device 8 on the second fin panel casing 7 and third fin panel casing 9.The deashing device 8 includes deashing component
81 and transmission component 82, the transmission component 82 drives deashing component 81 to pump on fin panel casing 20,
In the deashing component 81 be equipped with elastic metallic yarn 811, the elastic metallic yarn 811 along fin panel casing 20 width direction
Laterally it is arranged and is bonded with the wall surface of fin panel casing 20.
In the present embodiment, serpentine flow path is divided into three flue gas backhauls, the corresponding membrane type water of each flue gas backhaul
Cold wall 20, wherein the flue gas mean temperature of the first flue gas backhaul is 750 DEG C, flue gas flow rate 3.5m/s；Second flue gas backhaul
Flue gas mean temperature is 600-650 DEG C, flue gas flow rate 4m/s；The flue gas mean temperature of third flue gas backhaul is 520-550 DEG C,
Flue gas flow rate is 3m/s, and then the flue-gas temperature at furnace outlet 10 is made to be down to 520 DEG C or less.In other feasible embodiments,
20 quantity of fin panel casing in burner hearth dilute-phase zone 21 can be other numerical value, and corresponding flue gas backhaul quantity also changes.Example
If the quantity of fin panel casing 20 is 2, then corresponding flue gas backhaul quantity is also 2, and the flue gas of the first flue gas backhaul is average at this time
Temperature is 700-750 DEG C, flue gas flow rate 3.5m/s, and the flue gas mean temperature of the second flue gas backhaul is 520-550 DEG C, flue gas stream
Speed is 3m/s, and compared to the boiler of 3 fin panel casings 20, the boiler of 2 fin panel casings 20 mainly passes through change membrane type
The size of water-cooling wall 20 cools down to realize.
Wherein, fin panel casing 20 is made of several heat exchange pipelines 71 and band steel 72, and the band steel 72 is set to two and changes
Between heat pipeline 71, the width of band steel 72 is equal with the radius of heat exchange pipeline 71, and the cooling medium in heat exchange pipeline 71 is drum
In saturated water, and the temperature of cooling medium be lower than 400 DEG C.Therefore more effectively cool down to flue gas.
Through research discovery for solid matter, degree of volatility depends on the height of fusing point, and for wherein one
For a little easily sublimates, sublimation point then determines the key factor of its degree that distils, and the sodium compound in coal is in addition to silicate
Melting point compound existing for form is very high outer, and the sodium compound fusing point of other forms is all very low.The fusing point of common sodium compound
It is as shown in table 1 below:
According to the above-mentioned melting point analysis to sodium compound, it is known that (melted lower than sodium compound when flue-gas temperature drops to 520 DEG C or less
Point) when, solidification will be all precipitated in the sodium salt steam in flue gas, so that flue gas is purified, no longer steams containing sodium metallic compound
Gas, the heating surface for encountering lower temperature will not form the cohesiveness dust stratification being difficult to clean off.Therefore it can fundamentally solve high sodium
Contamination problems caused by coal combustion.At the same time, with the decline of flue-gas temperature, sodium salt vapors in burner hearth dilute-phase zone 21
Object will be collected on fin panel casing 20, can timely and effectively clear up condensation using the deashing device 8 on fin panel casing 20
Sodium compound.
It should be noted that fusing point of the temperature of the first flue gas backhaul higher than most of sodium compound, therefore first film
It can be not provided with deashing device 8 on formula water-cooling wall, but need to be arranged on other fin panel casings.Other feasible embodiments
In, deashing device 8 also can be set on first fin panel casing, the present invention is to this without specifically limiting.
Referring to Fig. 2 and Fig. 3, the deashing component 81 in the deashing device 8 further includes fixing element 812 I, fixing element II
813 and pulley 814, elastic metallic yarn 811 be fixed in fixing element 812 I, fixing element I 812 pass through fixing element II
813 are fixedly connected with pulley 814.Transmission component 82 in the deashing device 8 include driving element 821, actuated element and
Pulley track 825, actuated element include power axle 822, driving wheel 823 and transmission steel wire 824, the driving element 821
For driving motor, such as asynchronous motor supplied with variable frequency；Power axle 822 penetrates driving wheel 823, and transmission steel wire 824 winds driving wheel 823
With pulley 814, pulley 814 is arranged on pulley track 825.Driving element 821 drives power axle 822 to rotate, and then drives
Driving wheel 823 rotates, and moves in the traction lower sheave 814 of transmission steel wire 824 along pulley track 825, so that elastic metallic yarn
811 pump along fin panel casing 20.
Wherein, elastic metallic yarn 811 and fixing element 812 set Active Interface, to facilitate elastic metallic yarn 811 regular more
It changes.
Based on above-mentioned boiler structure, the boiler course of work is as follows:
Raw coal is sent into burner hearth by coal feeding hole 4, raw coal, in burner hearth suspension combustion, generates under the air effect from air compartment 1
The thickness gas backhaul that is formed by fin panel casing 20 of high-temperature flue gas gradually cool down, and make the flue-gas temperature at furnace outlet 10
At 520 DEG C hereinafter, the sodium compound steam in flue gas all solidifies precipitation on fin panel casing 20, deashing device 8 is synchronized clearly
Except the cohesiveness dust stratification on fin panel casing 20.Clean flue gas enters separator 11 and carries out gas solid separation, the flue gas after separation
Continue to exchange heat into back-end ductwork and in stream heating surface 13, economizer 14, air preheater 15, temperature passes through after being reduced to 135 DEG C to be removed
After 16 dedusting of dirt device, is sucked out by air-introduced machine 17 to chimney 18 and be discharged into atmosphere.
Based on above-mentioned boiler, the present invention also provides the releasing pollution discharge treatment methods of above-mentioned boiler, include the following steps:
(1): high sodium coal is sent into burner hearth by coal feeding hole 4；
(2): divulging information to air compartment 1, and the high sodium coal that burns in burner hearth concentrated phase area；
(3): the sodium in coal enters flue gas after burning distillation, and gradually condensation is precipitated in fin panel casing in membrane wall backhaul
On, flying dust is attached on fin panel casing；
(4): starting the deashing device 8 on fin panel casing 20, the elastic metallic yarn 811 in deashing device 8 is in fin panel casing
It pumps on 20, cleans up the cohesiveness dust stratification on fin panel casing；
Wherein, the flue gas that high sodium coal combustion generates enters dilute-phase zone 21 by concentrated phase area, is formed along fin panel casing 20 snakelike
Airflow channel flowing cooling, and the flue-gas temperature of the furnace outlet 10 of dilute-phase zone 21 is made to be 520 DEG C or less；
(5): the flue gas of the furnace outlet 10 of dilute-phase zone 21 successively being arranged to separator 11, back-end ductwork, chimney is finally discharged to
18。
It is emphasized that example of the present invention be it is illustrative, without being restrictive, thus the present invention it is unlimited
Example described in specific embodiment, other all obtained according to the technique and scheme of the present invention by those skilled in the art
Embodiment does not depart from present inventive concept and range, and whether modification or replacement, also belong to protection model of the invention
It encloses.
Claims (10)
1. a kind of anti-high sodium coal combustion stains circulating fluidized bed boiler, it is characterised in that: including burner hearth, air compartment, separator and tail
Portion's flue, the burner hearth are equipped with coal feeding hole, and the air compartment, burner hearth, separator, back-end ductwork are sequentially communicated；
The burner hearth is divided into concentrated phase area and dilute-phase zone, and the concentrated phase area is located at lower furnace portion, and the dilute-phase zone is located on burner hearth
Portion, at least provided with 2 fin panel casings in the dilute-phase zone, dislocation is parallel and then in dilute-phase zone between adjacent fin panel casing
Serpentine flow path is formed, the furnace outlet of the dilute-phase zone is connected to separator inlet, the furnace outlet of the dilute-phase zone
Flue-gas temperature is 520 DEG C or less；
Deashing device is not equipped on the fin panel casing adjacent with concentrated phase area, the deashing device includes deashing component and transmission
Component, the transmission component drive deashing component to pump on fin panel casing, set in the deashing component
Flexible wire, the elastic metallic yarn is laterally arranged along the width direction of fin panel casing and the wall with fin panel casing
Face paste is closed.
2. anti-high sodium coal combustion according to claim 1 stains circulating fluidized bed boiler, it is characterised in that: the dilute-phase zone
3 fin panel casings are inside equipped with, the serpentine flow path in the dilute-phase zone is divided into three flue gas backhauls, each flue gas backhaul
A corresponding fin panel casing；
Wherein, the flue gas mean temperature of the first flue gas backhaul is 750 DEG C, flue gas flow rate 3.5m/s；
The flue gas mean temperature of second flue gas backhaul is 600-650 DEG C, flue gas flow rate 4m/s；
The flue gas mean temperature of third flue gas backhaul is 520-550 DEG C, flue gas flow rate 3m/s.
3. anti-high sodium coal combustion according to claim 1 or 2 stains circulating fluidized bed boiler, it is characterised in that: described clear
Grey component further includes fixing element and pulley, and the elastic metallic yarn is fixed in fixing element, the fixing element and cunning
Wheel is fixedly connected；
The transmission component includes driving element, actuated element and pulley track, and the actuated element includes power axle, passes
Driving wheel and transmission steel wire, the driving element are connect with actuated element, and the power axle penetrates driving wheel, the transmission steel
Silk winding driving wheel and pulley, the pulley are arranged on pulley track.
4. anti-high sodium coal combustion according to claim 1 or 2 stains circulating fluidized bed boiler, it is characterised in that: the film
Formula water-cooling wall is made of several heat exchange pipelines and band steel, and the band steel is set between two heat exchange pipelines；
Cooling medium in the heat exchange pipeline is the saturated water in drum, and the temperature of the cooling medium is lower than 400 DEG C.
5. anti-high sodium coal combustion according to claim 4 stains circulating fluidized bed boiler, it is characterised in that: the band steel
Width is equal with the radius of heat exchange pipeline.
6. anti-high sodium coal combustion according to claim 1 or 2 stains circulating fluidized bed boiler, it is characterised in that: described dense
Phase region is equipped with abrasionproof fin pipe laying, and the abrasionproof fin pipe laying is arranged with 12~15 ° of tilt angle, the abrasionproof fin pipe laying
It is lateral, longitudinal away from for 100mm~150mm.
7. anti-high sodium coal combustion according to claim 1 or 2 stains circulating fluidized bed boiler, it is characterised in that: the tail
Convection heating surface, economizer and air preheater are equipped in portion's flue, it is pre- that flue gas passes sequentially through stream heating surface, economizer and sky
Device；
It is additionally provided with deduster and air-introduced machine between the back-end ductwork and chimney, the outlet of the back-end ductwork and deduster
Input port connection, the outlet of the deduster are connected to the input port of air-introduced machine, and the outlet and chimney of the air-introduced machine connect
It is logical.
8. a kind of anti-high sodium coal combustion as described in claim 1 stains the releasing pollution discharge treatment method of circulating fluidized bed boiler,
It is characterized in that, includes the following steps:
(1): high sodium coal is sent into burner hearth by coal feeding hole；
(2): aweather chamber ventilated, and the high sodium coal that burns in burner hearth concentrated phase area；
(3): the sodium in coal enters flue gas after burning distillation, and gradually condensation is precipitated in fin panel casing in membrane wall backhaul
On, flying dust is attached on fin panel casing；
(4): the deashing device on starting fin panel casing, the elastic metallic yarn of deashing device carry out up and down on fin panel casing
It moves back and forth, cleans up the cohesiveness dust stratification on fin panel casing；
Wherein, the flue gas that high sodium coal combustion generates enters dilute-phase zone by concentrated phase area, the serpentine flow formed along fin panel casing
Channel flowing cooling, and the flue-gas temperature of the furnace outlet of dilute-phase zone is made to be 520 DEG C or less；
(5): the flue gas of the furnace outlet of dilute-phase zone is successively arranged to separator, back-end ductwork.
9. releasing pollution discharge treatment method according to claim 8, it is characterised in that: be equipped with 3 membrane type water in the dilute-phase zone
Cold wall, the serpentine flow path in the dilute-phase zone are divided into three flue gas backhauls, the corresponding membrane type water of each flue gas backhaul
Cold wall；
Wherein, the flue gas mean temperature of the first flue gas backhaul is 750 DEG C；
The flue gas mean temperature of second flue gas backhaul is 600-650 DEG C；
The flue gas mean temperature of third flue gas backhaul is 520-550 DEG C.
10. releasing pollution discharge treatment method according to claim 9, it is characterised in that: the flue gas stream of the first flue gas backhaul
Speed is 3.5m/s, and the flue gas flow rate of the second flue gas backhaul is 4m/s, and the flue gas flow rate of the third flue gas backhaul is 3m/s.
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| CN201810603271.4A CN109028045A (en) | 2018-06-12 | 2018-06-12 | The anti-high sodium coal combustion of one kind stains circulating fluidized bed boiler and releasing pollution discharge treatment method |
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| CN201810603271.4A CN109028045A (en) | 2018-06-12 | 2018-06-12 | The anti-high sodium coal combustion of one kind stains circulating fluidized bed boiler and releasing pollution discharge treatment method |
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| CN112594665A (en) * | 2020-12-17 | 2021-04-02 | 上海康恒环境股份有限公司 | Flow disturbing device of waste heat boiler |
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Application publication date: 20181218 |