CN106705032A - Circulating fluidized bed boiler based on denitration ultra-low emission technology - Google Patents
Circulating fluidized bed boiler based on denitration ultra-low emission technology Download PDFInfo
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- CN106705032A CN106705032A CN201710169242.7A CN201710169242A CN106705032A CN 106705032 A CN106705032 A CN 106705032A CN 201710169242 A CN201710169242 A CN 201710169242A CN 106705032 A CN106705032 A CN 106705032A
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- secondary air
- air
- pin
- boss
- blast cap
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Classifications
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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
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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
- F23C10/20—Inlets for fluidisation air, e.g. grids; Bottoms
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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
- F23C2201/00—Staged combustion
- F23C2201/30—Staged fuel supply
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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
- F23C2206/00—Fluidised bed combustion
- F23C2206/10—Circulating fluidised bed
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention discloses a circulating fluidized bed boiler based on the denitration ultra-low emission technology. A boiler body is communicated with an upper secondary air pipeline assembly and a lower secondary air pipeline assembly used for introducing upper secondary air and lower secondary air. The circulating fluidized bed boiler based on the denitration ultra-low emission technology is characterized in that protruding anti-abrasion bosses are evenly arranged on the water-cooled wall above the cone end of a hearth, and are fixed to the water-cooled wall through pins; the pins comprise the number I pins extending in the horizontal direction and the obliquely-arranged number II pins; the number II pins are located below the number I pins; the upper surface of each anti-abrasion boss is a horizontal surface, and the lower surface of each anti-abrasion boss is a bevel; the pins are embedded in the anti-abrasion bosses; a manual air door is added on each upper secondary air pipeline of the upper secondary air pipeline assembly; each manual air door is connected with an upper upper secondary air pipeline; each upper upper secondary air pipeline is further provided with an expansion joint; and the upper upper secondary air pipelines are used for introducing upper upper secondary air for the boiler body.
Description
Technical field
The present invention relates to a kind of CFBB, more particularly to the low emission recirculating fluidized bed pot based on denitration technology
Stove.
Background technology
The type that the current boiler of my company (Hua electricity Jasper Lake, Shaanxi electricity generating corporation, Ltd) manufactures and designs for Dongfang Boiler Factory
Number for DG705/13.8-II 1 CFB boiler, using single drum, Natural Circulation, CFBC mode.
As shown in Figure 1 and Figure 7, boiler main will be by a fin panel casing burner hearth, three vapour cooled Cyclones and
The individual part of tail vertical well (HRA) three coated by the cold bag wall of vapour constitutes.In burner hearth front wall collocation have eight pendant superheater tube panels,
Six screen formula reheater tube panels, rear wall paper puts two panels water-cooled evaporation screen.Boiler is disposed with eight coal feeding holes altogether, is all arranged in stove
Before, in front water wall bottom, contraction section is evenly arranged in the width direction.Burner hearth bottom is that the water for surrounding is bent by water screen tube
Once hot-flow flue is arranged in cold air chamber, water cooled wind chamber both sides, and air intake pattern is that, from air compartment both sides air intake, the Secondary Air of air preheater one goes out
, in both sides, one time hot-flow flue arrangement is relatively simple for mouth.Two typhoons are respectively disposed with air channel of lower furnace portion left and right sides
Road start-up burner, sets combustion-supporting oil gun on four beds on burner hearth emulsion zone water-cooling wall front wall, rear wall sets combustion-supporting on two beds
Oil gun.Four slag-drip openings are arranged in water-cooling wall bottom after burner hearth, and four rolling-cylinder type slag-coolers are corresponded to respectively.
The denitration technology of existing boiler uses non-selective catalytic reduction (SNCR) technique, and my company's boiler was in 2014 12
The moon puts into operation.SNCR inlet NOx concentrations 280mg/m3 (standard state, butt, 6%O2, similarly hereinafter) is pressed in denitration, and exit NOx concentration≤
100mg/m3, in 70%~100% load range, denitration efficiency >=70%；In 50%~70% load range, denitration effect
Rate >=64% is designed, and denitrification reducing agent uses urea.
According on November 1st, 2015 to November 5, on November 10th, 2015 to November 14 respectively to 1, No. 2 boiler machines
The denitrification apparatus performance experiment that group is carried out, 1, No. 2 unit denitrification apparatus leading indicators are as shown in the table：
As seen from the above table, 1, No. 2 unit underloads have that NOx concentration is higher to cause the exceeded phenomenon of outlet drain, analysis
Separator entrance flue gas temperature is low when its reason is mainly underrun causes SNCR denitration efficiency low and uses high calcium coal and exist
Formation of nitrogen oxides is high during underrun causes, and other operating mode property indices can reach design performance guarantor substantially
Card.
Existing denitrating system according to《Fossil-fuel power plant atmospheric pollutant emission standard》(GB13223-2011) and local government row
Limit value requirement design is put, minimum discharge limitation is not reaching to and is required.By analysis, existing SNCR denitration system is according to public module
System is performed, it is impossible to is reached the control of monoblock system and is required, and inlet zone spray gun uses single-sided arrangement, and urea liquid cannot be abundant
Mix with flue gas.Denitrating system cannot realize NOXFrom motion tracking.By experiment of knowing the real situation, in low- load conditions, bed temperature only has about
780 DEG C, SNCR denitration system reaction temperature window region is not reached.Style and features serious wear, goods fluid uniformity is poor in stove, rotation
The separating effect of wind separator is poor.The as-fired coal volatile matter of this boiler is higher, and calcium sulfur ratio is bigger than normal, belongs to high calcium low-sulfur coal, stove
Interior furnace charge concentration is higher, and particularly in underload section, burner hearth differential pressure is higher, and circulating ash quantity is on the high side, causes bed temperature relatively low.
The content of the invention
The technical problems to be solved by the invention are for above-mentioned deficiency of the prior art, there is provided one kind is based on denitration
The CFBB of minimum discharge technology, it can lift combustion efficiency in the case of underload, reduce discharge, while also
The wearability of furnace water cooling inwall is increased, helps to extend burner hearth service life in high temperature.
In order to achieve the above object, the present invention is achieved using following technical scheme：
Based on the CFBB of denitration minimum discharge technology, comprising body of heater, three cyclone separators；The stove of body of heater
Thorax bottom includes the water-cooling wall surrounded into by water screen tube, and burner hearth lowermost end is that burner hearth bores section；The body of heater is communicated with for drawing
Enter the upper Secondary Air pipeline assembly and lower Secondary Air pipeline assembly of upper Secondary Air and lower Secondary Air；It is characterized in that：The burner hearth
The abrasionproof boss of projection is uniformly arranged on water-cooling wall above tapered end, abrasionproof boss is fixed by a pin to the water-cooling wall
On, the pin includes horizontal direction No. I pin for extending and No. II pin being obliquely installed；No. II pin is located at No. I pin
Lower section, the upper surface of abrasionproof boss is horizontal plane, and lower surface is inclined-plane；Pin is embedded in inside abrasionproof boss；
Increase a manual air door in each of upper Secondary Air pipeline assembly on Secondary Air pipeline, on manual air door in connection
Upper Secondary Air pipeline, expansion joint is additionally provided with upper Secondary Air pipeline；Upper Secondary Air pipeline is that the body of heater is introduced
Secondary Air.
As a kind of preferred embodiment of the invention：Air port, upper two that the upper Secondary Air pipeline is connected with body of heater
Difference in height between secondary air pipe line and the air port of body of heater is 5160mm；The air port caliber of upper Secondary Air pipeline is 273mm；Air port
The material of pipeline is Cr25Ni20；The wind speed in air port is 40.5m/s.
As a kind of preferred embodiment of the invention：The pin is arranged between two water screen tubes；Pin is
Integrally formed V-structure, cross section is circular or rectangle；No. I the two of pin free end sets arc sections, V-structure
Center be arc transition；The material of the abrasionproof boss is the plastic material of fire-resistant abrasion-proof；Abrasionproof boss is cast in described
On pin；The arrangement quantity of abrasionproof boss is 4 Rotating fields, and every layer includes multiple uniform abrasionproof boss.The setting of V-structure makes
Intensity is higher after obtaining whole boss moulding by casting.The edge circular arc of the V-type of top can lift boss intensity, and top is main
Wear-resisting position.
As a kind of preferred embodiment of the invention：Air-distribution device, the air-distribution device bag are provided with the body of heater
The core pipe for air intake containing air distribution plate and on air distribution plate, the core pipe is blast cap core pipe, and the top of blast cap core pipe is pacified
Dress blast cap outer cover；The upper and lower surface of air distribution plate is laid with castable, blast cap core pipe near top position from upper and
Under set gradually three row's air vents, often arrange comprising 8 uniform air vents；Mutually stagger the position of three row's air vents；It is described
Uniformly 10 perforates are offered on blast cap outer cover；The central axis of perforate is diagonally downward；The blast cap outer cover end face center is opened up
Through hole, blast cap core pipe top extends boss, and boss is embedded in the through hole.
As a kind of preferred embodiment of the invention：The assembling boss of projection is provided with the blast cap core pipe；It is described
Castable above air distribution plate is gravity flow wear-resistant castable, and the castable below air distribution plate is moldable for middle matter；The blast cap
Assembling flange and limited impression are correspondingly arranged on the top periphery of core pipe and on blast cap shield base inwall respectively；Assembling
Flange and limited impression are discontinuous multiple absolute construction.The assembling flange and limited impression of this preferred embodiment can be very
Easily cause that blast cap core pipe and blast cap outer cover carry out rotary stopper and again assembly and disassembly by rotation.
As a kind of preferred embodiment of the invention：The cyclone separator is the cyclonic separation with SNCR components
Device；
In the SNCR components, comprising the multiple spray guns being arranged on the preceding horizontal flue of cyclone separator, the spray gun
By the way of both sides are arranged；The SNCR components are high also comprising the hp fluid air pipeline for introducing high pressure air
Wind is distributed to each spray gun by pressure fluidisation air pipe line；The spray gun is provided with three imports, and respectively urea liquid import, atomization is blown
Sweep wind inlet and chuck cooling wind inlet.
As a kind of preferred embodiment of the invention：10 sprays are respectively provided with the preceding horizontal flue of each cyclone separator
Rifle.
As a kind of preferred embodiment of the invention：The central tube of each cyclone separator is casting；Casting
Material is 310S, and the gusset of central tube casts channel-section steel formula gusset using δ=16；The cylinder of central tube sets wide together on top
Spend for 200mm, be highly 170, the big gusset of channel-section steel formula of thickness 20mm, cylinder outside increases the reinforcement of four road ring-types；
The central tube is using the mounting means freely hung：Described freely hanging refers to that central tube passes through the big gusset in top
It is placed on support.
As a kind of preferred embodiment of the invention：The central tube length is 4900mm, and cylinder external diameter suitable for reading isMouth external diameter is under the central tube of both sides cyclone separatorUnder the central tube of middle cyclone separator
Mouthful external diameter is
Cylinder upper end sealed cast material bottom adds a circle to seal ring flat-plate.
As a kind of preferred embodiment of the invention：Also include circulating ash ash exhauster, the circulating ash ash exhauster
The material returning device of standpipe bottom is arranged on comprising standpipe, material returning device dust leg, the connection of material returning device dust leg are set on the material returning device
There is circulating ash to cool down escaper；The circulating ash cooling escaper includes cooling box, and cooling box top sets high-temperature material
Entrance, cooling box bottom sets low-temperature material outlet, and cooling box outer surface is equipped with cooling water circulation pipeline.
Present invention has the advantages that：
The present invention can be applied to underload by the arrangement of upper Secondary Air, when heavy-duty service, according to tune
Examination situation, can maintain Secondary Air to run, and can also close Secondary Air, be run using former secondary air system, it is to avoid produce
Bed temperature is too high to cause the other problemses such as coking.Newly-increased upper Secondary Air, further enhanced fuel fractional combustion control NOx emission life
Into；The structure that the present invention passes through abrasionproof component, abrasionproof component blocks sticking wall flow by setting boss on water-cooling wall, thus mitigates
Abrasion of the sticking wall flow to stove internal heating surface.The present invention reduces the abrasion of furnace heating surface when fire box temperature is improved.
Brief description of the drawings
Fig. 1 is a kind of a part of structural representation of specific embodiment of the invention；Fig. 1 and Fig. 7 is a kind of specific reality
The overall structure of mode is applied, for the sake of clarity, two parts is shown respectively；
Fig. 2 is the schematic view of the mounting position of abrasionproof component of the invention；
Fig. 3 is partial enlargement structural representation at the A of Fig. 2；
Fig. 4 is a kind of broken section structural representation of specific embodiment of abrasionproof component of the invention；
Fig. 5 is No. I pin layout drawing of abrasionproof component of the invention；
Fig. 6 is No. II pin layout drawing of abrasionproof component of the invention；
Fig. 7 is a kind of another part structural representation of specific embodiment of the invention；Fig. 7 and Fig. 1 is a kind of specific
The overall structure of implementation method, for the sake of clarity, two parts is shown respectively；
Fig. 8 is a kind of structural representation of specific embodiment of blast cap component of the invention；
Fig. 9-1~9-5 is the installation process schematic diagram of blast cap component of the invention, wherein, Fig. 9-1 shows for air distributor structure
It is intended to, Fig. 9-2 is the structural representation of core pipe, Fig. 9-3 is the structural representation that core pipe is installed on air distribution plate, and Fig. 9-4 is deposited
If the structural representation of castable, Fig. 9-5 is the structural representation after installation outer cover；
Figure 10 is a kind of specific mounting structure schematic diagram of the central tube of cyclone separator of the invention.
Description of reference numerals：
1- Pulverized Coal Bins, 2- slide valves, 3- measuring appliances, 4- bodies of heater, 5- weighing coal feeders, 6- sealing airs, 7- remaining give coal
Machine, 8- high pressure airs, upper Secondary Air on 9-, the upper Secondary Airs of 10-, Secondary Air under 11-, 12- abrasionproof components, 13- starts bed
Material mouth, remaining broadcasts coal mouthful to 14-, and 15- Secondary Air preheaters, 16- air channels igniter, 17- scum pipes, 18- air-distribution devices, 19- is rolled
Cylinder slag cooler, 20- overfire air fans, 21- First air preheaters, 22- material returning device dust legs, 23- compressed airs, the igniting of 24- air channels
Device cooling wind, 25- primary air fans, 26-J valve blower fans, 27- circulating ash ash exhausters, 28-SNCR components, 29- cyclone separators,
30- pins, 31- water screen tubes, No. I pin of 32-, No. II pin of 33-, 34- abrasionproof boss, 35- back-end surfaces, 36- once/
Secondary Air, 37- dedusters, 38- flying dust systems, 39- air-introduced machines, 40- chimneys, 41- blast cap outer covers, 42- core pipes, 43- assemblings are convex
Platform, 44- castables, 45- triangle gussets, the big gussets of 46-, 47- central tubes, 48- supports；Arrow straight up in Figure 10 refers to
Show that support supports force direction, arrow Deictic Center cylinder gravity direction straight down.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment describes the specific embodiment of the invention：
As illustrated, it illustrates specific embodiment of the invention, as illustrated, disclosed by the invention ultralow based on denitration
The CFBB of draining technology, comprising 4, three cyclone separators 28 of body of heater；The burner hearth bottom of body of heater is included by water-cooled
The water-cooling wall that wall pipe is surrounded into, burner hearth lowermost end is that burner hearth bores section；The body of heater be communicated with for introduce upper Secondary Air 10 and under
The upper Secondary Air pipeline assembly and lower Secondary Air pipeline assembly of Secondary Air 11；Laid on water-cooling wall above the burner hearth tapered end
The abrasionproof boss 34 of projection is equipped with, abrasionproof boss is fixed by a pin on the water-cooling wall, the pin includes horizontal direction
No. I pin 32 for extending and No. II pin 33 being obliquely installed；No. II pin is located at No. I pin lower section, the upper table of abrasionproof boss
Face is horizontal plane, and lower surface is inclined-plane；Pin is embedded in inside abrasionproof boss；
Increase a manual air door in each of upper Secondary Air pipeline assembly on Secondary Air pipeline, on manual air door in connection
Upper Secondary Air pipeline, expansion joint is additionally provided with upper Secondary Air pipeline；Upper Secondary Air pipeline is that the body of heater is introduced
Secondary Air 9.
As shown in the figure：The air port in air port, upper Secondary Air pipeline and body of heater that the upper Secondary Air pipeline is connected with body of heater
Between difference in height be 5160mm；The air port caliber of upper Secondary Air pipeline is 273mm；The material of air port pipeline is
Cr25Ni20；The wind speed in air port is 40.5m/s.
As shown in the figure：The pin is arranged between two water screen tubes 31；The V-structure being formed in one of pin,
Cross section is circular or rectangle；No. I the two of pin free end sets arc sections, and the center of V-structure is circular arc mistake
Cross；The material of the abrasionproof boss is the plastic material of fire-resistant abrasion-proof；Abrasionproof boss is cast on the pin；The cloth of abrasionproof boss
Quantity is put for 4 Rotating fields, every layer includes multiple uniform abrasionproof boss.Increase active multistage shoe, abrasionproof beam technology
Core be to block sticking wall flow by setting boss on water-cooling wall, thus mitigate abrasion of the sticking wall flow to stove internal heating surface.This
Project reduces the abrasion of furnace heating surface while fire box temperature is improved.
Bonded boiler design parameter and actual conditions, arrange 4 layers of active multiple stage type abrasionproof beam, and multistage shoe is installed at
On the water-cooling wall of burner hearth cone section top, boss is formed by fire-resistant abrasion-proof is moldable, and boss is fixed on water-cooling wall by pin.
Shoe arranges that cross dimensions and each layer shoe schematic diagram are as follows.Separated in view of implementing to improve before unit
The transformation of device cigarette temperature, can suitably reduce the active multiple stage type abrasionproof beam number of plies.It is of the invention compared with other shoe structures
Modification scheme is greatly shortened shoe size, while each interlamellar spacing tends to reasonable, Flow of Goods and Materials state in transformation rear hearth
Change, particularly lower furnace portion significantly declines near the concentration of water-cooling wall, so that the abrasion of lower portion thereof is significantly
Degree declines, and boiler continuous operating time is greatly improved.For less desuperheat water consumption, it is to avoid shielded overtemperature, using rank
Ladder type system of laying is carried out shielding heating surface and laid, and lays area about 40m2。
As shown in the figure：Air-distribution device 18 is provided with the body of heater, the air-distribution device is comprising air distribution plate and installed in cloth
The core pipe 42 for air intake on aerofoil, the core pipe is blast cap core pipe, and blast cap outer cover 41 is installed on the top of blast cap core pipe；Cloth wind
The upper and lower surface of plate is laid with castable, and blast cap core pipe sets gradually three rows and leads to from top to bottom near the position on top
Air holes, often arranges comprising 8 uniform air vents；Mutually stagger the position of three row's air vents；Uniformly opened on the blast cap outer cover
It is provided with 10 perforates；The central axis of perforate is diagonally downward；The blast cap outer cover end face center opens up through hole, blast cap core pipe top
Extend boss, boss is embedded in the through hole.
As shown in the figure：The assembling boss 43 of projection is provided with the blast cap core pipe；Castable above the air distribution plate
It is gravity flow wear-resistant castable, the castable below air distribution plate is middle matter moldable 44；The top periphery of the blast cap core pipe
Assembling flange and limited impression are correspondingly arranged on upper and blast cap shield base inwall respectively；Assembling flange and limited impression are
Discontinuous multiple absolute construction.
Above-mentioned air-distribution device is improved core pipe and blast cap outer cover, generally, boiler bed temperature will be brought uniform, is subtracted
The labour intensity of few operations staff.Because the drag characteristic of the blast cap core pipe for newly increasing is concentrated mainly in blast cap core pipe, therefore
Varying aperture caused by the abrasion of blast cap outer cover aperture, influences smaller, so as to advantageously ensure that blast cap is long to blast cap drag characteristic
Phase reliable performance.
As shown in Fig. 9-1~9-5, blast cap pitch keeps constant, changes the castable of air distribution plate upper and lower, changes blast cap
Outer cover, whole core pipes.Separate unit boiler amounts to 1980 blast caps, and core pipe aperture flow velocity is in 50.5~58.5m/s, blast cap aperture stream
Speed first, removes the 75mm castables above air distribution plate, and the castable after the 100mm of lower section in 26.7~31.4m/s.Fire resisting
After material is removed and take blast cap and core pipe away；The core pipe for newly increasing is installed on original air distribution plate in the hole of core pipe, and in boss
Periphery full weld connects.According to duration length situation, the type of refractory material is determined.Duration such as blowing out transformation allows preferentially adopt
With cast.In air distribution plate bottom or top (if moldable) welding bitch, refractory material is laid；The wind for newly increasing finally is installed
Cap outer cover (material Cr25Ni20).After outer cover insertion core pipe pin, 180 ° of angles are rotated.Pin on operation core pipe pins outer
Cover, so that outer cover will not be blown afloat.
As shown in the figure：The cyclone separator is the cyclone separator with SNCR components；
In the SNCR components, comprising the multiple spray guns being arranged on the preceding horizontal flue of cyclone separator, the spray gun
By the way of both sides are arranged；The SNCR components are high also comprising the hp fluid air pipeline for introducing high pressure air
Wind is distributed to each spray gun by pressure fluidisation air pipe line；The spray gun is provided with three imports, and respectively urea liquid import, atomization is blown
Sweep wind inlet and chuck cooling wind inlet.
As shown in the figure：10 spray guns are respectively provided with the preceding horizontal flue of each cyclone separator.
The improvement of above-mentioned spraygun portion, every stove SNCR system now arranges 30 spray guns, is arranged in horizontal cigarette before separator
Road, each separator arranges 10, using both sides arrangement.By optimize spray gun arrange, change and increase high-efficient spray gun come
Realize improving SNCR reaction efficiencies.
Special instruction：The inlet zone of urea liquid is according to features of oven profile and field condition, binding tests result of study, injection
The arrangement of device (spray gun) is divided into three regions, and horizontal access flue is an isolated area before every cyclone separator.Each region
Injector (spray gun) is arranged in entrance horizontal flue both sides.Each injector (spray gun) component has suitably sized and spy
Property, it is ensured that flow and pressure needed for reaching necessary NOX emission reductions, eject position must by horizontal flue Field Flow Numerical Simulation,
Determine position and spray angle, it is ensured that reducing agent is uniform and anti-abrasive anti-plugging.Each injector (spray gun) has three imports, respectively
Urea liquid, atomization purging wind, chuck cooling wind.Ejection assemblies specifically include air atomizing injector (spray gun), for connecting
Connector, ready-packaged joint to boiler supports and for reducing agent, atomizing air, the connection of cooling duct road braided steel wire long can
Curved spout.
As shown in the figure：The central tube 47 of each cyclone separator is casting；Founding materials is 310S, central tube
Gusset casts channel-section steel formula gusset using δ=16；The cylinder of central tube sets one width and is 200mm, is highly on top
The big gusset 46 of channel-section steel formula of 170, thickness 20mm, cylinder outside increases the reinforcement of four road ring-types；
The central tube is using the mounting means freely hung：Described freely hanging refers to that central tube passes through the big gusset in top
It is placed on support 48.
As shown in the figure：The central tube length is 4900mm, and cylinder external diameter suitable for reading isBoth sides cyclone separator
Central tube under mouth external diameter beMouth external diameter is under the central tube of middle cyclone separator
Cylinder upper end sealed cast material bottom adds a circle to seal ring flat-plate.
The improvement that the above-mentioned central tube on cyclone separator is carried out, big gusset is caused by the installation of free suspending way
It is free cooperation (fixation of any mode such as welding) between support, relative can slides, therefore central tube is in expanded by heating
When or will not be deformed by larger resistance during cooling meat.And because big gusset, triangle gusset and central tube are
Integrally casting has intensity higher, and will not be distorted deformation, with good using effect.
(6) cylinder upper end sealed cast material bottom adds a circle to seal ring flat-plate.
(7) central tube top many-sided reason such as extrudes due to weld strength and swelling blockage, in use for some time,
The problems such as weld bond Local Cracking easily occurs in top weld bond, to this, my company is reinforced by the way of pasting board welding, to ensure
Installation quality.
As shown in the figure：Circulating ash ash exhauster 27 is also included, the circulating ash ash exhauster is arranged on standpipe comprising standpipe
The material returning device of bottom, sets material returning device dust leg 22 on the material returning device, material returning device dust leg is connected with circulating ash cooling discharge
Device；The circulating ash cooling escaper includes cooling box, and cooling box top sets high-temperature material entrance, cooling box bottom
Low-temperature material outlet is set, and cooling box outer surface is equipped with cooling water circulation pipeline.Circulating ash cooling discharge refers to by standpipe
In circulating ash be directly entered material returning device bottom setting circulating ash cooling escaper cooling after be expelled directly out steam generator system, no longer
Circulation is participated in stove.Stove interior circulation ash quantity and circulating ratio are reduced, boiler can realize stable operation, solve excessively to be led because of circulating ash
Every problem of cause, improves full factory's economic benefit, and for NOx qualified discharges provide technical guarantee.
To sum up, present invention employs multiple technologies collaboration optimization boiler operatiopn, control NOx emission, finally realize that NOx is ultralow
Discharge.
Specifically,
The present invention is by newly-increased upper Secondary Air, further enhanced fuel fractional combustion control NOx emission generation；
The present invention is improved by central cylinder of separator mounting structure, improves separator；
The present invention is optimized by SNCR denitration system spray gun position optimization design and spray gun structure；
Preferably blast cap parameter of the invention, rationally design blast cap resistance resistance, realizes the independence of blast cap resistance and wind speed, it is ensured that
Fluidisation and cloth wind uniformity under underload；
The newly-increased circulating ash cinerary device of the present invention, solves, because of the excessive caused items problem of circulating ash, to improve full factory's economy
Benefit, and for NOx qualified discharges provide technical guarantee；
The present invention increases active multistage shoe, and the core of abrasionproof beam technology is by setting boss on water-cooling wall
Blocking sticking wall flow, thus mitigates abrasion of the sticking wall flow to stove internal heating surface.This project reduces stove while fire box temperature is improved
The abrasion of thorax heating surface.
Investment for trnasforming urban land of the invention is less, and the control that NOx emission concentration can be stablized after the completion of comprehensive reformation technology exists
50mg/m3 (standard state, butt, 6%O2) below, amount of ammonia slip average value less than 2ppm, later stage operating cost and maintenance cost compared with
It is low.
Ultra-low emission of NOx technology almost disclosure satisfy that domestic existing various CFBB, can comprehensively improve circulation
Fluidized-bed combustion boiler economy, the feature of environmental protection and reliability.
All it is that, using current boiler script structure, detailed structure is no longer described on the part beyond improvement；On
In drawing reflect the part with reference it is stated that, the part without specifically mentioned description is existing boiler component.
The preferred embodiment for the present invention is explained in detail above in conjunction with accompanying drawing, but the invention is not restricted to above-mentioned implementation
Mode, in the ken that those of ordinary skill in the art possess, can also be on the premise of present inventive concept not be departed from
Make a variety of changes, these changes are related to correlation technique well-known to those skilled in the art, and these both fall within patent of the present invention
Protection domain.
Not departing from the spirit and scope of the present invention can make many other changes and remodeling.It should be appreciated that the present invention is not
It is limited to specific implementation method, the scope of the present invention is defined by the following claims.
Claims (10)
1. the CFBB of denitration minimum discharge technology is based on, comprising body of heater, three cyclone separators；The burner hearth of body of heater
Bottom includes the water-cooling wall surrounded into by water screen tube, and burner hearth lowermost end is that burner hearth bores section；The body of heater is communicated with for introducing
The upper Secondary Air pipeline assembly and lower Secondary Air pipeline assembly of upper Secondary Air and lower Secondary Air；It is characterized in that：The burner hearth cone
The abrasionproof boss of projection is uniformly arranged on water-cooling wall above end, abrasionproof boss is fixed by a pin on the water-cooling wall,
The pin includes horizontal direction No. I pin for extending and No. II pin being obliquely installed；No. II pin is located under No. I pin
Side, the upper surface of abrasionproof boss is horizontal plane, and lower surface is inclined-plane；Pin is embedded in inside abrasionproof boss；
Increase a manual air door in each of upper Secondary Air pipeline assembly on Secondary Air pipeline, on manual air door upper two in connection
Secondary air pipe line, expansion joint is additionally provided with upper Secondary Air pipeline；Upper Secondary Air pipeline is upper secondary on the body of heater is introduced
Wind.
2. the CFBB of out of stock minimum discharge technology is based on as claimed in claim 1, it is characterised in that：On described
The air port of upper Secondary Air pipeline and body of heater connection, the difference in height between upper Secondary Air pipeline and the air port of body of heater are 5160mm；On
The air port caliber of upper Secondary Air pipeline is 273mm；The material of air port pipeline is Cr25Ni20；The wind speed in air port is 40.5m/s.
3. the CFBB of denitration minimum discharge technology is based on as claimed in claim 1, it is characterised in that：The pin
Nail is arranged between two water screen tubes；The V-structure being formed in one of pin, cross section is circular or rectangle；No. I pin
Two free ends of nail set arc sections, and the center of V-structure is arc transition；The material of the abrasionproof boss is fire resisting
Anti-wear plastic material；Abrasionproof boss is cast on the pin；The arrangement quantity of abrasionproof boss is 4 Rotating fields, and every layer comprising more
Individual uniform abrasionproof boss.
4. the CFBB of denitration minimum discharge technology is based on as claimed in claim 1, it is characterised in that：The stove
Air-distribution device is provided with body, the air-distribution device includes air distribution plate and the core pipe for air intake on air distribution plate, institute
Core pipe is stated for blast cap core pipe, blast cap outer cover is installed on the top of blast cap core pipe；The upper and lower surface of air distribution plate is laid with to be poured
Material feeding, blast cap core pipe sets gradually three row's air vents from top to bottom near the position on top, often arranges comprising 8 uniform ventilations
Hole；Mutually stagger the position of three row's air vents；Uniformly 10 perforates are offered on the blast cap outer cover；The central axis of perforate inclines
Obliquely；The blast cap outer cover end face center opens up through hole, and blast cap core pipe top extends boss, and boss is embedded in the through hole.
5. the CFBB of denitration minimum discharge technology is based on as claimed in claim 4, it is characterised in that：The wind
The assembling boss of projection is provided with cap core pipe；Castable above the air distribution plate is gravity flow wear-resistant castable, air distribution plate
The castable of lower section is that middle matter is moldable；Distinguish on the top periphery of the blast cap core pipe and on blast cap shield base inwall
It is correspondingly arranged on assembling flange and limited impression；Assembling flange and limited impression are discontinuous multiple absolute construction.
6. the CFBB of denitration minimum discharge technology is based on as claimed in claim 1, it is characterised in that：The rotation
Wind separator is the cyclone separator with SNCR components；
In the SNCR components, comprising the multiple spray guns being arranged on the preceding horizontal flue of cyclone separator, the spray gun is used
The mode of both sides arrangement；The SNCR components are also comprising the hp fluid air pipeline for introducing high pressure air, high-pressure spray
Wind is distributed to each spray gun by wind transmission pipeline；The spray gun is provided with three imports, respectively urea liquid import, atomization purging wind
Import and chuck cooling wind inlet.
7. the CFBB of denitration minimum discharge technology is based on as claimed in claim 6, it is characterised in that：Each rotation
10 spray guns are respectively provided with the preceding horizontal flue of wind separator.
8. the CFBB of denitration minimum discharge technology is based on as claimed in claim 1, it is characterised in that：Each rotation
The central tube of wind separator is casting；Founding materials is 310S, and the gusset of central tube casts channel-section steel formula using δ=16
Gusset；The cylinder of central tube sets one width and is 200mm, is highly 170 on top, the big gusset of channel-section steel formula of thickness 20mm,
Cylinder outside increases the reinforcement of four road ring-types；
The central tube is using the mounting means freely hung：Described freely hanging refers to that central tube is laid by the big gusset in top
On support.
9. the CFBB of denitration minimum discharge technology is based on as claimed in claim 8, it is characterised in that：In described
Heart tube length degree is 4900mm, and cylinder external diameter suitable for reading isMouth external diameter is under the central tube of both sides cyclone separatorMouth external diameter is under the central tube of middle cyclone separator
Cylinder upper end sealed cast material bottom adds a circle to seal ring flat-plate.
10. the CFBB of denitration minimum discharge technology is based on as claimed in claim 1, it is characterised in that：Also wrap
Ash exhauster containing circulating ash, the circulating ash ash exhauster is arranged on the material returning device of standpipe bottom, the material returning device comprising standpipe
Upper setting material returning device dust leg, material returning device dust leg is connected with circulating ash cooling escaper；The circulating ash cools down escaper bag
Containing cooling box, cooling box top sets high-temperature material entrance, and cooling box bottom sets low-temperature material outlet, cooling box
Outer surface is equipped with cooling water circulation pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710169242.7A CN106705032B (en) | 2017-03-21 | 2017-03-21 | Circulating fluidized bed boiler based on denitration minimum discharge technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710169242.7A CN106705032B (en) | 2017-03-21 | 2017-03-21 | Circulating fluidized bed boiler based on denitration minimum discharge technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106705032A true CN106705032A (en) | 2017-05-24 |
| CN106705032B CN106705032B (en) | 2019-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710169242.7A Expired - Fee Related CN106705032B (en) | 2017-03-21 | 2017-03-21 | Circulating fluidized bed boiler based on denitration minimum discharge technology |
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| Country | Link |
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| CN (1) | CN106705032B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108679601A (en) * | 2018-07-02 | 2018-10-19 | 哈尔滨红光锅炉总厂有限责任公司 | The abrasionproof of environment-friendly and energy-efficient circulating fluidized bed boiler and sealing and expansion integrated system |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN106705032B (en) | 2019-04-16 |
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