CN108151009B - A kind of adherent wind apparatus preventing coal-burning boiler water wall high temperature corrosion - Google Patents
A kind of adherent wind apparatus preventing coal-burning boiler water wall high temperature corrosion Download PDFInfo
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- CN108151009B CN108151009B CN201711424470.0A CN201711424470A CN108151009B CN 108151009 B CN108151009 B CN 108151009B CN 201711424470 A CN201711424470 A CN 201711424470A CN 108151009 B CN108151009 B CN 108151009B
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- secondary air
- air
- wall
- compressed air
- spray head
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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
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M5/00—Casings; Linings; Walls
- F23M5/08—Cooling thereof; Tube walls
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/002—Regulating air supply or draught using electronic means
Abstract
The present invention is made of adherent wind cell arrangement, TT&C system etc., and adherent wind cell arrangement is sealed and is adjusted axially etc. devices by ventilation casing, Secondary Air spray head, Thermal Barrier Coatings, wall-through and formed.By wall-through sealing device dynamic sealing at casing wall-through of divulging information；There is radial second wind snout on Secondary Air spray head, built-in central compressed air distributor, De Laval noz(zle) are connect with ventilation casing threads；Gap forms compressed air spout between ventilation casing-external pressure draw；De Laval noz(zle) sprays supersonic speed wind, compressed air spout sprays the storing injection of high speed winds, greatly enhances Secondary Air air film layer rigidity, water-cooling wall and furnace gas have been isolated very well, has imparted water-cooling wall high temperature corrosion resistance for Secondary Air, compressed air bilayer air film；Axial-adjustment unit, TT&C system impart optimization of operating parameters characteristic；Thermal Barrier Coatings are heat-insulated, Secondary Air and the double coolings of compressed air, Secondary Air spray head are detachable, assign Patent equipment Anti-burnout, easy replaceability.
Description
Technical field
The invention belongs to coal-burning boiler technical fields, more particularly to one kind is for preventing coal-burning boiler water wall high temperature corrosion
Adherent wind apparatus.
Background technique
Boiler water-cooling wall high-temperature corrosion is the major issue for influencing power plant's operational safety, and in China, have nearly 80% it is big
Type station boiler is influenced by water wall high temperature corrosion.In the case that coal quality is constant, coal-fired ash characteristics, wall-cooling surface
Neighbouring atmosphere, water screen tube wall temperature and water screen tube material be influence coal-burning boiler water wall high temperature corrosion it is main because
Element.The strength of national energy conservation and emission reduction policy promotes and to the higher requirement of coal electricity efficiency of generating unit, boiler water wall in recent years
Temperature it is also higher and higher；In addition low-NO_x combustion technology generallys use, it is easier to be formed about strong reducing property gas in water-cooling wall
Atmosphere causes coal-burning boiler water wall high temperature corrosion problem benefit to become serious.For the boiler for operation of having gone into operation, water screen tube material
It is difficult to change, reduce water cooling wall temperature will affect boiler output again；Therefore in the case where burning coal is difficult to change, to guarantee
Boiler output, the atmosphere property for trying to change nearly water cooling wall region become the mainstream side for solving coal-burning boiler water wall high temperature corrosion
Method.
Adherent wind apparatus is installed on water-cooling wall, generates the adherent wind of isolation strong reducing property air-flow, it is attached to change water-cooling wall
Nearly atmosphere is a kind of important method for solving coal-burning boiler water wall high temperature corrosion.Existing adherent wind apparatus mainly uses single
Secondary Air as adherent wind, be divided into two classes according to the method that adherent wind is sent into furnace: spray head is protruded into furnace and is blown by 1., wind
To being parallel to wall-cooling surface；2. adherent bellows are arranged on the outside of water-cooling wall, pass through a large amount of apertures opened up on water-cooling wall fin
It blows into furnace, wind direction is perpendicular to wall-cooling surface.Main problem existing for method 1 is: 1. Secondary Air pressure is lower, sprays rigidity
Poor, the distance along water-cooling wall flowing is short, and the good water-cooling wall air film blast consumption of formation covering is big, transports to burning in furnace and boiler
Row influences big；2. the secondary air temperature by spray head is higher, single Secondary Air is poor to spray head cooling effect, the easy scaling loss of spray head.
Main problem existing for method 2 is then: when 1. Secondary Air is sprayed into furnace perpendicular to wall-cooling surface, position is deeper in penetrating furnace, right
Burning will generate large effect in furnace；2. being formed about uniformity protection air film in water-cooling wall, a large amount of apertures need to be opened up, wind is consumed
Amount is big, big to combustion effects in furnace, and need to arrange large-scale adherent bellows, and investment is big.
It is found by being retrieved to existing patented technology, there has been no a kind of method or apparatus can effectively solve the above problem.
Summary of the invention
In view of the problems of the existing technology, it is good adherent can to form covering in the nearly wall-cooling surface of coal-burning boiler by the present invention
General mood film is isolated by water-cooling wall with furnace reduction flue gas, is effectively prevent water-cooling wall that high temperature corrosion occurs, is greatly reduced simultaneously
With air quantity, cooperate real-time optimization operating parameter, mitigates the influence to burning in furnace, and can prevent well adherent wind apparatus from protruding into
The scaling loss of furnace inner region component.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of adherent wind apparatus preventing coal-burning boiler water wall high temperature corrosion includes: ventilation casing, the fixed branch of contact
Frame, fixed bracket, movable end cover, fixed end cap, high-temperature resistant seal ring, Secondary Air spray head, Thermal Barrier Coatings, wall-through sealing dress
It sets, axial-adjustment unit, connect hose, hose coupling, Secondary Air liaison tube and TT&C system.The ventilation casing, by center
Compressed air hose, secondary air channel and external compression air hose coaxial line suit composition, secondary air channel is by being welded on external compression air hose
The fixed bracket of contact on inner wall is supported fixation, be welded and fixed between central compressed air pipe and secondary air channel bracket into
Row is connected and fixed；Fixed end cap is installed to be packaged on secondary air channel air intake nozzle；On external compression air hose air intake nozzle
Installation activity end cap, it is close by completing dynamic between high-temperature resistant seal ring nested on movable end cover and external compression air inside pipe wall
Envelope.The hole that is formed by bending from water screen tube of ventilation casing penetrates in furnace, at wall-through by the wall-through sealing device into
Mobile state sealing；The wall-through sealing device is consolidated by refractory metal thermal-insulating sealing box, ring cone-shape metallic leak-proof part and ring cowling shape
Determine part composition；The ring cowling shape fixing piece is fixed on boiler setting metal casing by the overhanging wing plate of end cap with stud, in
Chamber nesting fixes refractory metal thermal-insulating sealing box, and port is closely connect with water screen tube fin by welding；The ring cone
Shape metal seal is two half-conical ring compositions, and ring, which is wrapped up in, is adjacent to external compression air pipe outer wall, is fixed on ring cowling by stud
On shape fixing piece；Whole device passes through connection ring cone-shape metallic leak-proof part and ring to the sealing precision at ventilation casing wall-through
The stud of lid shape fixing piece is adjusted.The Secondary Air spray head, by Secondary Air showerhead chassis, Secondary Air spray head top cover, center
Compressed air distributor, De Laval noz(zle) composition, Secondary Air showerhead chassis and Secondary Air spray head top cover are connected through a screw thread and surround
Secondary Air nozzle cavity；Secondary Air showerhead chassis is circumferentially uniformly provided with radial second wind snout, Secondary Air spray head adapter tube thereon
It is threadedly coupled with the secondary air channel of ventilation casing；Central compressed air distributor is placed in Secondary Air nozzle cavity, arrival end with
The center compressed air hose of ventilation casing is threadedly coupled, and is respectively distributed outlet end and is welded with each overfire air port center of alignment
De Laval noz(zle).Compressed air hose, which enters, except Secondary Air spray head outer surface and ventilation casing sprays gradient on the outer surface of furnace section
Thermal barrier coating.Compressed air hose exit end face and the opposite end clearance of Secondary Air showerhead chassis are formed except the ventilation casing
Compressed air spout.Each pipe air inlet of ventilation casing is welded with air inlet adapter tube, wherein central compressed air pipe air inlet connects
It manages and external compression air hose air inlet adapter tube all connects with compressed air inlet, low-pressure air entrance (using when lacking compressed air) respectively
Connect, Secondary Air adapter tube connect with Secondary Air liaison tube, between be by connect hose, hose coupling progress flexible connection.Institute
State axial-adjustment unit, including external compression air hose axial moving device and Secondary Air spray head axial moving device, two groups of movements
Device is made of hydraulic drive arm, hydraulic cylinder, reversal valve, oil pump, fuel tank regulating valve and fuel tank, and the hydraulic drive arm of each group is logical
Stud is crossed to connect with external compression air hose air intake outer wall and secondary air channel air intake outer wall respectively.The TT&C system is by each wind
Regulating valve and the dispersion of flow sensor, the CO concentration sensor on the water-cooling wall of adherent wind region and temperature sensor and DCS on pipe
Control system composition；Wherein the regulating valve is mounted on compressed air inlet, low-pressure air entrance, central compressed air channel air inlet
In pipeline, external compression air duct intake stack, Secondary Air entrance and Secondary Air liaison tube distribution outlet.
Technical principle of the invention is illustrated below:
Secondary Air from air preheater is entered through connection hose by secondary air channel inner wall by the distribution of Secondary Air liaison tube
With the secondary air channel of central compressed air pipe outer wall composition；Compressed air (or low-pressure air) is respectively enterd through respectively connection hose
What the central compressed air channel surrounded by central compressed air pipe and external compression air inside pipe wall and secondary air channel outer wall surrounded
External compression air duct.The Secondary Air of secondary air channel flows into Secondary Air nozzle cavity, and the compression in central compressed air channel is empty
Gas, which flows into, is placed in the central compressed air distributor of Secondary Air nozzle cavity, and after respectively distributed through central compressed air distributor
The compressed air that the De Laval noz(zle) supersonic speed at mouthful end sprays, the Secondary Air in injection Secondary Air nozzle cavity, the two mixing from
Overfire air port is formed in parallel with the Secondary Air air film layer of water-cooling wall (close to burner hearth along parallel water-cooling wall direction high speed ejection
Side)；The compressed air of external compression air duct from compressed air spout along parallel water-cooling wall direction high speed ejection, while injection two
Secondary general mood film layer is formed in parallel with the compressed air air film layer of water-cooling wall (close to water-cooling wall side)；The Secondary Air of formation, compression are empty
The double-deck adherent general mood film of gas has obstructed the breeze airflow of strong reducing property in furnace well, high-temperature flue gas stream enters water-cooling wall area nearby
Domain greatly alleviates the high temperature corrosion of water-cooling wall.Wherein, compressed air is sprayed through De Laval noz(zle) supersonic speed and compressed air is sprayed
It is low, rigid not only to overcome single hot Secondary Air spouting velocity well for the mouth high speed ejection ejector action dual to Secondary Air
The disadvantage of difference, but also significantly reduce to form good adherent general mood film needed for Secondary Air dosage, Secondary Air spray head quantity
And influence of the adherent general mood film to burning in furnace；The Secondary Air of heat, cold compressed air (or low-pressure air) are flowing through ventilation simultaneously
It when casing, exchanges heat, the decline of Secondary Air temperature is conducive to the cooling of Secondary Air spray head, and compressed air temperature increases, is conducive to
Reduce influence of the compressed air air film layer to burning and conducting heat in furnace.When lacking compressed air, to guarantee adherent wind apparatus just
Often work, external compression air duct, central compressed air channel can introduce the low-pressure air substitution provided by blower.
The advantages of invention, is illustrated below:
The two compressed air channels folder secondary air channel cloth wind mode that cannula structure of divulging information is formed is conducive to strengthen the secondary of heat
The fluid interchange in ventilation casing of wind and cold compressed air, after heat exchange: Secondary Air temperature is substantially reduced, and is conducive to secondary
The cooling of wind spray head；Compressed air temperature increases, and advantageously reduces influence of the adherent wind to burning in furnace.External compression air, in
The dual-cooled of Secondary Air spray head is acted on when heart compressed air-Secondary Air mixed gas high speed ejection, is protruded into secondary in furnace
Wind spray head and ventilation bushing outer surface spray the good heat-blocking action of Thermal Barrier Coatings, effectively protect each component in furnace and exempt from
By the scaling loss of high temperature gas flow, it is ensured that adherent wind apparatus long-term safety work.Thermal sleeve is substituted with Thermal Barrier Coatings, is saved
Thermal sleeve installation procedure, saves the set-up time, and alleviate installation weight.
Secondary Air spray head is assembled by each component, and Secondary Air showerhead chassis is threadedly coupled with Secondary Air spray head top cover, two
Secondary wind spray head adapter tube and central compressed air distributor input end are connect with secondary air channel and central compressed air pipe screw thread respectively,
Impart Secondary Air spray head and the detachable replaceability of Secondary Air nozzle group member, be conducive to after the careless scaling loss of spray head quickly more
It changes, it is ensured that the continued reliability of adherent wind apparatus work.Compressed air in central compressed air channel is through in Secondary Air spray head
De Laval noz(zle) supersonic speed is sprayed with the compressed air in external compression air duct through compressed air spout high speed ejection to secondary
The dual ejector action of wind greatly increases the rigidity and spray distance of Secondary Air, Secondary Air dosage, adherent wind is greatly reduced
The quantity of cell arrangement also significantly reduces the influence of the compressed air dosage and outer layer Secondary Air air film of injection to burning.
Further, since Secondary Air dosage is greatly decreased, can be used needed for the Secondary Air liaison tube substitution prior art of major diameter in water
The large-scale adherent bellows of arrangement, investment cost are greatly reduced on the outside of cold wall.
The external compression air hose axial moving device and Secondary Air spray head axial moving device of axial-adjustment unit pass through each
It is connect respectively with external compression air hose air intake outer wall and secondary air channel air intake outer wall from hydraulic drive arm, imparts Secondary Air
Spray head, entire adherent wind cell arrangement are adjusted axially characteristic；Wall-through sealing device, movable end cover nesting high-temperature resistant seal ring it is dynamic
State sealing and the use of contact fixed bracket, connection hose are conducive to the realization being adjusted axially；TT&C system is based on sensor
Output signal, regulate and control two groups of axial moving device amount of movements and regulating valve, change external compression air hose, Secondary Air spray head protrudes into
Flow is entered the wind in the depth of burner hearth and each channel, to realize boiler difference service condition compressed air gas thicknesses of layers, flowing
Speed and with a distance from water-cooling wall and the optimizing regulation of the distance of Secondary Air air film leafing water-cooling wall.
The external compression air duct of ventilation casing and central compressed air channel are equipped with two transportation work styles: being all the way that compression is empty
Gas uses under normal circumstances；Another way is spare low-pressure air, and when non-compressed air uses, by the direct air feed of blower, it is ensured that adherent
Wind apparatus operates normally.
Detailed description of the invention
Fig. 1 is the adherent wind cell arrangement structural schematic diagram of the present invention.
Fig. 2 is Secondary Air nozzle structure schematic diagram of the present invention.
Fig. 3 is wall-through sealing device schematic diagram of the present invention.
Fig. 4 is the mounting arrangements schematic diagram of the adherent wind apparatus of the present invention.
In Fig. 1, Fig. 2, Fig. 3, Fig. 4: 1- water-cooling wall；2- water screen tube；3- water screen tube fin；4- burner hearth；The center 5- pressure
Contracting air duct；6- secondary air channel；7- external compression air duct；8- ventilation casing；9- central compressed air pipe；10- bis- times
Air hose；11- external compression air hose；12- contact fixes bracket；13- fixes bracket；14- fixes end cap；15- movable end cover；
16- high-temperature resistant seal ring；17- Thermal Barrier Coatings；18- compressed air spout；19- overfire air port；20- Secondary Air spray head；
21- Secondary Air showerhead chassis；22- Secondary Air spray head top cover；23- Secondary Air spray head adapter tube；24- central compressed air distributor；
25- De Laval noz(zle)；The compressed air inlet 26-；27- low-pressure air entrance；28- Secondary Air entrance；29- Secondary Air liaison tube；30-
Secondary Air liaison tube distribution outlet；31- central compressed air pipe air inlet adapter tube；32- secondary air channel air inlet adapter tube；33- external compression
Air hose air inlet adapter tube；34- connection hose；35- hose coupling；36- axial-adjustment unit；37- external compression air hose axially moves
Dynamic device；38- Secondary Air spray head axial moving device；39- fuel tank；40- fuel tank control valve；41- oil pump；42- reversal valve；43-
Hydraulic cylinder；44- hydraulic drive arm；45- wall-through sealing device；46- refractory metal thermal-insulating sealing box；47- ring cone-shaped metal is close
Sealing；48- ring cowling shape fixing piece；49- TT&C system；50- regulating valve；51- flow sensor；52- temperature sensor；53-CO
Concentration sensor；54- flow F；55- temperature signal T；56-CO concentration signal C；57-DCS scattered control system；58- spiral shell
Column.
Specific embodiment
The present invention is further described with reference to the accompanying drawing.
Fig. 1-Fig. 3 shows the adherent wind cell arrangement structure of the present invention.The adherent wind cell arrangement is by ventilation casing
8, the fixed bracket 12 of contact, fixed bracket 13, movable end cover 14, fixed end cap 15, high-temperature resistant seal ring 16, gradient thermal boundary apply
Layer 17, Secondary Air spray head 20, axial-adjustment unit 36 and wall-through sealing device 45 form.The ventilation casing 8 is by central compressed
Sequentially coaxially line suit forms from the inside to surface for air hose 9, secondary air channel 10 and external compression air hose 11；Wherein, secondary air channel 10
Four fixed brackets 13 are respectively welded on the inner wall of both ends, the other end and central compressed air pipe 9 of the fixed bracket 13 weld
Connection, makes secondary air channel 10 form a fixed connection with central compressed air pipe 9；It is welded respectively on 11 both ends inner wall of external compression air hose
The fixed secondary air channel 10 of the fixed bracket 12 of four contacts is connect, the other end of the fixed bracket 12 of the contact is arc surface,
On be coated with lubricating oil, ring wraps up in 10 outer wall of secondary air channel, forms its axially movable contact and fixes；10 air intake of secondary air channel
Nozzle is packaged by the way that end cap 14 is welded and fixed between 9 outer wall of central compressed air pipe；11 air intake of external compression air hose
Nozzle on 10 outer wall of secondary air channel by welding movable end cover 15, nested high-temperature resistant seal ring 16 and external pressure on movable end cover 15
11 inner wall of contracting air hose, which is in close contact, completes dynamic sealing, while can keep between secondary air channel 10 and external compression air hose 11
Being axially movable property；External compression air hose 11, which enters, to be coated with Thermal Barrier Coatings 17 on furnace section outer wall and is thermally shielded protection.Institute
It states central compressed air channel 5 to be surrounded by 9 inner wall of central compressed air pipe, the secondary air channel 6 is by central compressed air pipe 9
Outer wall is surrounded with 10 inner wall of secondary air channel, and the external compression air duct 7 is by outside 10 outer wall of secondary air channel and external compression air
11 inner wall of pipe surrounds.The hole that the ventilation casing 8 is formed by bending from water screen tube protrudes into furnace, passes through wall-through sealing device 45
Realize dynamic sealing；The wall-through sealing device 45 is by refractory metal thermal-insulating sealing box 46,47 and of ring cone-shape metallic leak-proof part
Ring cowling shape fixing piece 48 forms；The ring cowling shape fixing piece 48 is fixed on boiler setting metal with stud by the overhanging wing plate of end cap
On backplate, inner cavity nesting fixing internal fills the refractory metal thermal-insulating sealing box 46 of thermal-insulating sealing filler, and port passes through
Welding is closely connect with water-cooling wall fin section of jurisdiction 3；The ring cone-shape metallic leak-proof part 47 is softer metals, by two semicircle conical rings
Part composition, ring, which is wrapped up in, is adjacent to 11 outer surface of external compression air hose, is fastened on ring cowling shape fixing piece 48 by stud 58；Entirely
Device passes through the stud 58 of connection ring cone-shape metallic leak-proof part 47 and ring cowling shape fixing piece 48 to the sealing precision at wall-through
It is adjusted, realizes the dynamic sealing in gap between ventilation casing 8 and wall-through well, keep its axial movement.Institute
Secondary Air spray head 20 is stated by Secondary Air showerhead chassis 21, Secondary Air spray head top cover 22, central compressed air distributor 24, Laval
Jet pipe 25 assembles, and has good detachable replaceability；22 outside wall surface of Secondary Air showerhead chassis and Secondary Air spray head
The threaded connection of 23 inner wall of top cover surrounds Secondary Air nozzle cavity, the two outer surface be coated with Thermal Barrier Coatings 9 carry out every
Thermal protection；It is uniformly provided with 8 radial second wind snouts 19 in 22 circumferential direction of Secondary Air showerhead chassis, there is Secondary Air spray head adapter tube thereon
23,23 outer wall of Secondary Air spray head adapter tube is connect with 10 inner thread of secondary air channel；The central compressed air distributor 24 is placed in
20 inner cavity of Secondary Air spray head, arrival end inner wall are connect with 9 outer wall thread of central compressed air pipe；Its 8 distribution outlets are uniform
Distribution is directed at each 19 center of overfire air port, and is welded with De Laval noz(zle) 25.11 exit end face of external compression air hose
Compressed air spout 18 is formed with the opposite end clearance of Secondary Air showerhead chassis 22.The axial-adjustment unit 36 includes external pressure
Contracting air hose axial moving device 37 and Secondary Air spray head axial moving device 38, two groups of mobile devices are by fuel tank 39, fuel tank
Regulating valve 40, oil pump 42, reversal valve 42, hydraulic cylinder 43 and hydraulic drive arm 44 are constituted；Wherein, respective hydraulic drive arm 44a,
44b divides respectively with 11 air intake outside wall surface of external compression air outer tube and 10 air intake outside wall surface of secondary air channel by Stud connection
Control is not adjusted by certain speed from 39 draw oil of fuel tank through fuel tank control valve 40a and 40b by oil pump 41a and 41b, is passed through
Reversal valve 42a and 42b flow into hydraulic cylinder 43a and 43b and push hydraulic drive arm 44a and 44b movement, to realize external compression air
The axial movement of pipe 11 and Secondary Air spray head 20 realizes compressed air by adjusting the amount of movement of this two groups of axial moving devices
The adjusting of the distance of the size of spout 18, the distance away from water-cooling wall and overfire air port 19 away from water-cooling wall.The connection hose 34
Can high temperature resistant, share three, in which: connection hose 34a and 34c respectively by central compressed air pipe adapter tube 31 and external compression air
Pipe air inlet adapter tube 33 is all connected with compressed air inlet 26, low-pressure air entrance 27 by hose coupling 35；Connect hose 34b
Secondary air channel air inlet adapter tube 32 is connected with Secondary Air liaison tube 29 by hose coupling 35；The flexible of hose 34 is connected to connect
Each pipe of casing 8 of divulging information when being adjusted axially can be met to the relative motion between each air intake vent by connecing, and be conducive to the realization being adjusted axially.
What Fig. 4 was provided is one embodiment of the invention.According to boiler capacity and each position extent of corrosion, in pot
The adherent wind apparatus number of plies of reasonable Arrangement and every layer of adherent wind cell arrangement quantity on the wall of furnace side.Secondary Air from Secondary Air entrance 28 into
Enter Secondary Air liaison tube 29, the regulating valve 50 of the allocated and Secondary Air liaison tube distribution outlet passes through connection hose 34b after adjusting
Secondary air channel 6 is introduced from secondary air channel air inlet adapter tube 32；Compressed air (or low-pressure air) is from (or the low pressure of compressed air inlet 26
Wind entrance 27) it is adjusted respectively through the regulating valve 50 on central compressed air channel and external compression air duct blast pipe, from connection
Hose 34a and 34c enter the wind adapter tube 31 through central compressed air pipe and external compression air hose enter the wind adapter tube 33, respectively enter center
Compressed air channel 5 and external compression air duct 7；After the Secondary Air of heat flows through secondary air channel, temperature is reduced, and is sprayed through Secondary Air
When head inner cavity is sprayed from overfire air port, the cooling effect of Secondary Air spray head is enhanced；Into in central compressed air channel 5
After compressed air flows through the central compressed air distributor 24 of 20 inner cavity of Secondary Air spray head, outlet end De Laval noz(zle) is distributed from it
25 supersonic speed spray, and the Secondary Air of 20 inner cavity of injection Secondary Air spray head is high along 1 direction of water-cooling wall is parallel to from overfire air port 19
Speed sprays, and forms Secondary Air air film layer in 1 near zone of water-cooling wall (close to burner hearth side)；Flow through the pressure of external compression air duct 7
Contracting air is parallel to 1 direction high speed ejection of water-cooling wall through compressed air spout 18, forms compressed air air film layer (close to water cooling
Wall side)；The adherent general mood film of bilayer of formation, can not only well keep apart water-cooling wall and furnace reduction air-flow, moreover it is possible to one
Determining degree reduces water cooling wall temperature, and then prevents the generation of water wall high temperature corrosion very well.Wherein, compressed air is through drawing valve
Your 25 supersonic speed of pipe sprays and through 18 high speed ejection of compressed air spout under the dual ejector action of Secondary Air, and Secondary Air is rigid
It is able to greatly enhance (high speed winds relative to single compressed air spout), forms the good Secondary Air air film layer of coverage area
Consumed secondary air flow is greatly decreased；In addition, the compressed air of two compressed air channels is subtracted well by good preheating
Low temperature compressed air is lacked to combustion effects in furnace.
TT&C system 49 described in Fig. 4 is by regulating valve 50, flow sensor 51, temperature sensor 52, CO concentration sensor
53, DCS scattered control system 57 forms；The regulating valve 50 is equipped with 5 altogether, is separately mounted to compressed air inlet 26, low pressure
Wind entrance 27, Secondary Air entrance 28, Secondary Air liaison tube distribution outlet 30 and central compressed air channel intake stack and outer
On compressed air channel intake stack, by controlling to adjust the realization of valve 50 to the flow of compressed air (or low-pressure air) and Secondary Air
It adjusts；The flow sensor 51 is mounted in each air hose after regulating valve, the temperature sensor 52 and CO concentration sensing
Device 53 is respectively on installation adherent wind region water-cooling wall；Based on flow sensor 51, temperature sensor 52, CO concentration sensor 53
Output signal (flow F 54, temperature signal T55, CO concentration signal C56), DCS scattered control system 57 regulation section valve 50
Regulation is optimized with operating parameter of the axial-adjustment unit 36 to adherent wind apparatus.
The foregoing is merely a kind of specific embodiments of the invention, are not intended to limit the invention, former based on the invention
Any modification, the improvement etc. that reason basis is made, should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of adherent wind apparatus for preventing coal-burning boiler water wall high temperature corrosion, it is characterised in that: filled including adherent wind unit
It sets, Secondary Air liaison tube, connection hose, hose coupling, TT&C system；The adherent wind cell arrangement is by ventilation casing, fixation
Bracket, contact fixed bracket, fixed end cap, high-temperature resistant seal ring, Secondary Air spray head, Thermal Barrier Coatings, are worn movable end cover
Wall sealing device, axial-adjustment unit composition；The ventilation casing is by central compressed air pipe, secondary air channel, external compression air
Pipe sleeve dress composition, secondary air channel are fixed by the fixed bracket of the contact being mounted on external compression air inside pipe wall, and central compressed is empty
Bracket is welded and fixed between tracheae and secondary air channel to be connected and fixed, secondary air channel air intake nozzle is carried out by the way that end cap is welded and fixed
Encapsulation, external compression air hose air intake nozzle are moved by movable end cover and the high-temperature resistant seal ring being nested on movable end cover
State sealing；The hole that the ventilation casing is formed by bending from water screen tube penetrates in furnace, is sealed and is filled by the wall-through at wall-through
Set carry out dynamic sealing；The Secondary Air spray head includes: Secondary Air showerhead chassis, Secondary Air spray head top cover, central compressed air
Distributor, De Laval noz(zle) have radial second wind snout on the Secondary Air showerhead chassis, secondary on Secondary Air showerhead chassis
Wind spray head adapter tube, central compressed air distributor input end respectively with ventilation casing secondary air channel and central compressed air pipe spiral shell
Line connection, each distribution outlet end of central compressed air distributor are welded with the Laval spray for being directed at each overfire air port center
Pipe；External compression air pipe outlets end face and the opposite end clearance of the Secondary Air showerhead chassis constitute compressed air spray
Mouthful；The external compression air hose enters furnace section and the outer surface of Secondary Air spray head is coated with Thermal Barrier Coatings；The axial tune
Regulating device is hydraulic drive, including external compression air hose axial moving device and Secondary Air spray head axial moving device, two groups of axis
Outer wall to mobile device respectively with the outer wall of external compression air hose and secondary air channel passes through Stud connection；The ventilation casing is each
Pipe air inlet weld air inlet adapter tube, by connection hose, hose coupling respectively with Secondary Air liaison tube and compressed air inlet
Flexible connection；The TT&C system is by being mounted on the regulating valve of each wind upper tube and flow sensor, being mounted on adherent wind regional water
Temperature sensor and CO concentration sensor, DCS scattered control system composition in cold wall.
2. a kind of adherent wind apparatus for preventing coal-burning boiler water wall high temperature corrosion according to claim 1, feature exist
In the wall-through sealing device is made of refractory metal thermal-insulating sealing box, ring cone-shape metallic leak-proof part and ring cowling shape fixing piece；
Ring cowling shape fixing piece is fixed on boiler setting metal casing by the overhanging wing plate of end cap with stud, and ring cowling shape fixing piece inner cavity is embedding
Fixed refractory metal thermal-insulating sealing box is covered, ring cowling shape fixing piece port is closely connect by welding with water screen tube fin；Institute
It states ring cone-shape metallic leak-proof part to be made of two half-conical rings, ring, which is wrapped up in, is adjacent to external compression air tube outer surface, solid by stud
It is scheduled on ring cowling shape fixing piece；Whole device passes through connection ring cone-shape metallic leak-proof part and ring to the sealing precision at wall-through
The stud of lid shape fixing piece is adjusted.
3. a kind of adherent wind apparatus for preventing coal-burning boiler water wall high temperature corrosion according to claim 1, feature exist
In the Secondary Air spray head is by Secondary Air showerhead chassis, Secondary Air spray head top cover, central compressed air distributor, Laval
Jet pipe composition, Secondary Air showerhead chassis and Secondary Air spray head top cover are connected through a screw thread to form Secondary Air nozzle cavity, center pressure
Contracting air distributor, De Laval noz(zle) are placed in Secondary Air nozzle cavity；It is uniformly provided in Secondary Air showerhead chassis circumferential direction several
Radial second wind snout, the Secondary Air spray head adapter tube outer wall on Secondary Air showerhead chassis are connect with secondary air channel inner thread；In
Heart compressed air distributor input end inner wall is threadedly coupled with central compressed air pipe outer wall, central compressed air distributor it is each
It distributes outlet end and is directed at each overfire air port center, each distribution outlet end of central compressed air distributor is welded with Laval
Jet pipe；Secondary Air spray head and Secondary Air nozzle group member have detachable replaceability.
4. a kind of adherent wind apparatus for preventing coal-burning boiler water wall high temperature corrosion according to claim 1, feature exist
In the compressed air inlet is connected to spare low-pressure air entrance.
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| CN108151009B true CN108151009B (en) | 2019-04-30 |
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| CN108730969A (en) * | 2018-07-24 | 2018-11-02 | 西安热工研究院有限公司 | A kind of coal powder direct supplying burner structure with adjustable adherent wind |
| CN110274221A (en) * | 2019-06-25 | 2019-09-24 | 哈尔滨工业大学 | A kind of boiler preventing water wall high temperature corrosion |
| CN110440283A (en) * | 2019-08-08 | 2019-11-12 | 华北电力大学 | A kind of system of coal fired power plant prevention and treatment water wall high temperature corrosion |
| CN112432164A (en) * | 2020-11-18 | 2021-03-02 | 安徽工业大学 | Supercritical CO2Distributed air curtain device of boiler |
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