CN108151009A - A kind of adherent wind method and device for preventing coal-burning boiler water wall high temperature corrosion - Google Patents
A kind of adherent wind method and device for preventing coal-burning boiler water wall high temperature corrosion Download PDFInfo
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- CN108151009A CN108151009A CN201711424470.0A CN201711424470A CN108151009A CN 108151009 A CN108151009 A CN 108151009A CN 201711424470 A CN201711424470 A CN 201711424470A CN 108151009 A CN108151009 A CN 108151009A
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- secondary air
- air
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- compressed air
- nozzle
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- 238000005260 corrosion Methods 0.000 title claims abstract description 19
- 230000007797 corrosion Effects 0.000 title claims abstract description 19
- 230000001464 adherent effect Effects 0.000 title claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 28
- 238000000034 method Methods 0.000 title claims description 14
- 238000001816 cooling Methods 0.000 claims abstract description 50
- 238000007789 sealing Methods 0.000 claims abstract description 33
- 238000009423 ventilation Methods 0.000 claims abstract description 24
- 239000007921 spray Substances 0.000 claims abstract description 15
- 239000012720 thermal barrier coating Substances 0.000 claims abstract description 12
- 210000004894 snout Anatomy 0.000 claims abstract description 5
- 238000005457 optimization Methods 0.000 claims abstract description 3
- 230000006835 compression Effects 0.000 claims description 51
- 238000007906 compression Methods 0.000 claims description 51
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 230000033001 locomotion Effects 0.000 claims description 9
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 239000003870 refractory metal Substances 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 3
- 241000143973 Libytheinae Species 0.000 claims description 2
- 238000002347 injection Methods 0.000 abstract description 5
- 239000007924 injection Substances 0.000 abstract description 5
- 235000019628 coolness Nutrition 0.000 abstract 1
- 239000002828 fuel tank Substances 0.000 description 8
- 230000036651 mood Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 239000003921 oil Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000001603 reducing effect Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 210000000038 chest Anatomy 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Nozzles (AREA)
Abstract
The present invention is made of patent cell arrangement, TT＆C system etc., and cell arrangement is sealed and is adjusted axially etc. devices by ventilation casing, Secondary Air nozzle, 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 nozzle, built-in central compressed air distributor, De Laval noz(zle) are connect with ventilation casing threads；Gap forms compressed air spout between the 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, Secondary Air, compressed air bilayer air film have been isolated water-cooling wall and furnace gas, have imparted water-cooling wall high temperature corrosion resistance very well；Axial-adjustment unit, TT＆C system impart optimization of operating parameters characteristic；Thermal Barrier Coatings are heat-insulated, the double coolings of Secondary Air and compressed air, Secondary Air nozzle are detachable, assign Patent equipment Anti-burnout, easy replaceability；Patent cell arrangement number is arranged on demand.
Description
Technical field
The invention belongs to coal-burning boiler technical fields more particularly to one kind to be used to prevent coal-burning boiler water wall high temperature corrosion
Adherent wind method and device.
Background technology
Boiler water-cooling wall high-temperature corrosion is the major issue for influencing power plant 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 the policy of national energy-saving emission reduction in recent years promotes and to the higher requirement of coal electricity efficiency of generating unit, boiler water wall
Temperature it is also higher and higher；In addition low-NO_x combustion technology generally uses, 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, boiler output will be influenced again by reducing water cooling wall temperature；Therefore in the case where burning coal is difficult to change, to ensure
Boiler output, trying to change the atmosphere property of nearly water cooling wall region becomes 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 is mainly using single
Secondary Air as adherent wind, two classes are divided into according to the method that adherent wind is sent into stove：It blows 1. nozzle is stretched into stove, wind
To being parallel to wall-cooling surface；2. setting adherent bellows on the outside of water-cooling wall, pass through a large amount of apertures opened up on water-cooling wall fin
It blows into stove, wind direction is perpendicular to wall-cooling surface.Main problem existing for method 1 is：1. Secondary Air pressure is relatively low, rigidity is sprayed
Poor, the distance flowed along water-cooling wall is short, and the good water-cooling wall air film blast consumption of formation covering is big, and burning in stove and boiler are transported
Row influences big；2. the secondary air temperature by nozzle is higher, single Secondary Air is poor to nozzle cooling effect, the easy scaling loss of nozzle.
Main problem existing for method 2 is then：1. Secondary Air is in wall-cooling surface penetrating stove, position is deeper in penetrating stove, right
Burning will generate large effect in stove；2. being formed about uniformity protection air film in water-cooling wall, a large amount of apertures need to be opened up, consume wind
Amount is big, big to combustion effects in stove, 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 effectively to solve the above problems.
Invention content
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, coordinate real-time optimization operating parameter, mitigate the influence to burning in stove, and can prevent adherent wind apparatus from stretching into well
The scaling loss of stove inner region component.
The technical solution adopted by the present invention to solve the technical problems is：
A kind of adherent wind method and device for preventing coal-burning boiler water wall high temperature corrosion includes：Ventilation casing, contact
Fixing bracket, fixing bracket, movable end cover, fixed end cap, high-temperature resistant seal ring, Secondary Air nozzle, Thermal Barrier Coatings, wall-through
Sealing device, axial-adjustment unit, connection flexible pipe, hose coupling, Secondary Air liaison tube and TT＆C system.The ventilation casing,
It is made of central compressed air pipe, secondary air channel and external compression air hose coaxial line suit, secondary air channel is by being welded on external compression
Contact fixing bracket on air inside pipe wall is supported fixation, is welded and fixed between central compressed air pipe and secondary air channel
Stent is attached fixation；Fixed end cap is installed to be packaged on secondary air channel air intake nozzle；External compression air hose air intake
Installation activity end cap on nozzle, by being completed between high-temperature resistant seal ring nested on movable end cover and external compression air inside pipe wall
Dynamic sealing.The hole that the ventilation casing is formed by bending from water screen tube is penetrated in stove, is sealed at wall-through by the wall-through
Device carries out dynamic sealing；The wall-through sealing device is by refractory metal thermal-insulating sealing box, ring cone-shape metallic leak-proof part and ring
Lid shape fixing piece forms；The ring cowling shape fixing piece is fixed on boiler setting metal casing by the overhanging wing plate of end cap with stud
On, inner cavity nesting fixes refractory metal thermal-insulating sealing box, and port is closely connect with water screen tube fin by welding；Institute
It states ring cone-shape metallic leak-proof part to form for two semicircle rings, ring, which is wrapped up in, is adjacent to external compression air pipe outer wall, is fixed on by stud
On ring cowling shape fixing piece；Whole device passes through connection ring cone-shape metallic leak-proof part to the sealing precision at ventilation casing wall-through
It is adjusted with the stud of ring cowling shape fixing piece.The Secondary Air nozzle, by Secondary Air showerhead chassis, Secondary Air nozzle head cover,
Central compressed air distributor, De Laval noz(zle) composition, Secondary Air showerhead chassis and Secondary Air nozzle head cover are connected through a screw thread
Surround Secondary Air nozzle cavity；Secondary Air showerhead chassis is circumferentially uniformly provided with radial second wind snout, Secondary Air nozzle thereon
It takes over and is threadedly coupled with the secondary air channel for casing of divulging information；Central compressed air distributor is placed in Secondary Air nozzle cavity, entrance
The center compressed air hose with casing of divulging information is held to be threadedly coupled, the port of export is respectively distributed and is welded in each overfire air port of alignment
The De Laval noz(zle) of the heart.Compressed air hose enters except Secondary Air nozzle outer surface and ventilation casing sprays on the outer surface of stove section
Thermal Barrier Coatings.The opposite end clearance of compressed air hose exit end face and Secondary Air showerhead chassis except the ventilation casing
Form compressed air spout.Ventilation each pipe air inlet of casing is welded with air inlet and takes over, wherein, central compressed air pipe into
Wind is taken over and external compression air hose air inlet take over respectively all with compressed air inlet, low-pressure air entrance when compressed air (lack use)
Connection, Secondary Air is taken over connect with Secondary Air liaison tube, between be by connection flexible pipe, hose coupling progress flexible connection.
The axial-adjustment unit, including external compression air hose axial moving device and Secondary Air nozzle axial moving device, two groups of shiftings
Dynamic device is made of hydraulic drive arm, hydraulic cylinder, reversal valve, oil pump, fuel tank regulating valve and fuel tank, the hydraulic drive arm of each group
It is connect respectively with external compression air hose air intake outer wall and secondary air channel air intake outer wall by stud.The TT＆C system is by each
Regulating valve and flow sensor, the CO concentration sensors on the water-cooling wall of adherent wind region and temperature sensor and DCS points on air hose
Dissipate control system composition；Wherein described regulating valve be mounted on compressed air inlet, low-pressure air entrance, central compressed air channel into
In wind pipeline, external compression air duct intake stack, Secondary Air entrance and Secondary Air liaison tube distribution outlet.
The technical principle of this patent is illustrated below：
Secondary Air from air preheater is entered through connection flexible pipe 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 respective connection flexible pipe
What the central compressed air channel and external compression air inside pipe wall surrounded by central compressed air pipe was surrounded with secondary air channel outer wall
External compression air duct.The Secondary Air of secondary air channel flows into Secondary Air nozzle cavity, and the compression of 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 sprays at a high speed along parallel water-cooling wall direction, is formed in parallel with the Secondary Air air film layer of water-cooling wall (close to burner hearth
Side)；The compressed air of external compression air duct sprays, while injection two at a high speed from compressed air spout along parallel water-cooling wall direction
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 stove 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
Mouth sprays at a high speed the ejector action dual to Secondary Air, and it is low, rigid not only to overcome single hot Secondary Air spouting velocity well
The shortcomings that poor, but also significantly reduce Secondary Air dosage, the Secondary Air nozzle quantity to be formed needed for good adherent general mood film
And influence of the adherent general mood film to burning in stove；The Secondary Air of heat, cold compressed air (or low-pressure air) are flowing through ventilation simultaneously
It during casing, exchanges heat, Secondary Air temperature declines, and is conducive to the cooling of Secondary Air nozzle, and compressed air temperature raising is conducive to
Reduce influence of the compressed air air film layer to burning and conducting heat in stove.When lacking compressed air, to ensure adherent wind apparatus just
Often work, external compression air duct, central compressed air channel can be introduced to be substituted by the low-pressure air that wind turbine provides.
The advantages of patent of invention, is illustrated below：
The two compressed air channels folder secondary air channel cloth wind mode that sleeve structure of divulging information is formed is conducive to strengthen the secondary of heat
Wind and cold the compressed air fluid interchange in ventilation casing, after heat exchange：Secondary Air temperature is substantially reduced, and is conducive to secondary
The cooling of wind nozzle；Compressed air temperature increases, and advantageously reduces influence of the adherent wind to burning in stove.External compression air, in
The dual-cooled of Secondary Air nozzle is acted on when heart compressed air-Secondary Air mixed gas sprays at a high speed, is stretched into secondary in stove
Wind nozzle and the ventilation bushing outer surface spraying good heat-blocking action of Thermal Barrier Coatings, are effectively protected each component in stove and exempt from
By the scaling loss of high temperature gas flow, it is ensured that Patent equipment long-term safety works.Thermal sleeve is substituted with Thermal Barrier Coatings, is eliminated
Thermal sleeve installation procedure saves the set-up time, and alleviates installation weight.
Secondary Air nozzle is assembled by each component, and Secondary Air showerhead chassis is threadedly coupled with Secondary Air nozzle head cover, two
Secondary wind nozzle is taken over to be connect with central compressed air distributor input end with secondary air channel and central compressed air pipe screw thread respectively,
Impart Secondary Air nozzle and the detachable replaceability of Secondary Air jet head sets member, be conducive to after the careless scaling loss of nozzle it is quick more
It changes, it is ensured that the continued reliability of Patent equipment work.Compressed air in central compressed air channel is drawn in Secondary Air nozzle
It cuts down your jet pipe supersonic speed and sprays and sprayed with the compressed air port of compressed air in external compression air duct to Secondary Air at a high speed
Dual ejector action, greatly increase Secondary Air rigidity and jet length, Secondary Air dosage, patent unit is greatly reduced
The quantity of device also significantly reduces the influence of the compressed air dosage and outer layer Secondary Air air film of injection to burning.In addition,
Due to being greatly decreased for Secondary Air dosage, the Secondary Air liaison tube of major diameter can be used to substitute needed for the prior art outside water-cooling wall
The large-scale adherent bellows of side arrangement, investment cost are greatly reduced.
The external compression air hose axial moving device and Secondary Air nozzle 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
Nozzle, entire patent cell arrangement are adjusted axially characteristic；The dynamic of wall-through sealing device, movable end cover nesting high-temperature resistant seal ring
Sealing and the use of contact fixing bracket, connection flexible pipe are conducive to the realization being adjusted axially；TT＆C system is sensor-based
Output signal regulates and controls two groups of axial moving device amount of movements and regulating valve, changes external compression air hose, Secondary Air nozzle stretches into stove
The depth of thorax and each channel air inlet flow, so as to fulfill boiler difference service condition compressed air air film layer thickness, flowing speed
Degree 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 and central compressed air channel of ventilation casing are equipped with two transportation work styles：It is empty for compression all the way
Gas uses under normal circumstances；Another way is spare low-pressure air, and when non-compressed air uses, by the direct air feed of wind turbine, it is ensured that patent
Device normal operation.
Description of the drawings
Fig. 1 is patent cell arrangement structure diagram of the present invention.
Fig. 2 is patent Secondary Air nozzle structure schematic diagram of the present invention.
Fig. 3 is patent wall-through sealing device schematic diagram of the present invention.
Fig. 4 is the mounting arrangements schematic diagram of the novel adherent wind apparatus of patent of the present invention.
In Fig. 1, Fig. 2, Fig. 3, Fig. 4：1- water-cooling walls；2- water screen tubes；3- water screen tube fins；4- burner hearths；It presses at 5- centers
Contracting air duct；6- secondary air channels；7- external compression air ducts；8- ventilation casings；9- central compressed air pipes；10- bis- times
Air hose；11- external compression air hoses；12- contact fixing brackets；13- fixing brackets；14- fixes end cap；15- movable end covers；
16- high-temperature resistant seal rings；17- Thermal Barrier Coatings；18- compressed air spouts；19- overfire air ports；20- Secondary Air nozzles；
21- Secondary Air showerhead chassis；22- Secondary Air nozzle head covers；23- Secondary Air nozzles are taken over；24- central compressed air distributors；
25- De Laval noz(zle)s；26- compressed air inlets；27- low-pressure air entrances；28- Secondary Air entrances；29- Secondary Air liaison tubes；30-
Secondary Air liaison tube distribution outlet；31- central compressed airs pipe air inlet is taken over；32- secondary air channels air inlet is taken over；33- external compressions
Air hose air inlet is taken over；34- connection flexible pipes；35- hose couplings；36- axial-adjustment units；37- external compressions air hose axially moves
Dynamic device；38- Secondary Air nozzle axial moving devices；39- fuel tanks；40- fuel tank control valves；41- oil pumps；42- reversal valves；43-
Hydraulic cylinder；44- hydraulic drive arms；45- wall-through sealing devices；46- refractory metal thermal-insulating sealing boxes；47- ring cone-shaped metals are close
Sealing；48- ring cowling shape fixing pieces；49- TT＆C systems；50- regulating valves；51- flow sensors；52- temperature sensors；53-CO
Concentration sensor；54- flow Fs；55- temperature signals T；56-CO concentration signals C；57-DCS scattered control systems；58- spiral shells
Column.
Specific embodiment
Patent of the present invention is expanded on further below in conjunction with the accompanying drawings.
Fig. 1-Fig. 3 is illustrated that patent cell arrangement structure of the present invention.The patent cell arrangement by ventilation casing 8, connect
Touch property fixing bracket 12, fixing bracket 13, movable end cover 14, fixed end cap 15, high-temperature resistant seal ring 16, Thermal Barrier Coatings
17th, Secondary Air nozzle 20, axial-adjustment unit 36 and wall-through sealing device 45 form.The ventilation set 8 is by central compressed air
Sequentially coaxially line suit forms from the inside to surface for pipe 9, secondary air channel 10 and external compression air hose 11；Wherein, 10 both ends of secondary air channel
Four fixing brackets 13 are respectively welded on inner wall, the other end and the central compressed air pipe 9 of the fixing bracket 13 are welded to connect,
Secondary air channel 10 is made to form a fixed connection with central compressed air pipe 9；Four are respectively welded on 11 both ends inner wall of external compression air hose
A contact fixing bracket 12 fixes secondary air channel 10, and the other end of the contact fixing bracket 12 is arc surface, is applied thereon
There is lubricating oil, ring wraps up in 10 outer wall of secondary air channel, forms its axially movable contact and fixes；10 air intake nozzle of secondary air channel
It is packaged by being welded and fixed end cap 14 between 9 outer wall of central compressed air pipe；11 air intake nozzle of external compression air hose
By the welding movable end cover 15 on 10 outer wall of secondary air channel, nested high-temperature resistant seal ring 16 and external compression are empty on movable end cover 15
11 inner wall of tracheae be in close contact complete dynamic sealing, while can keep between secondary air channel 10 and external compression air hose 11 can
Axial movement property；External compression air hose 11, which enters, to be coated with Thermal Barrier Coatings 17 on stove section outer wall and is thermally shielded protection.In described
Heart compressed air channel 5 is surrounded by 9 inner wall of central compressed air pipe, and the secondary air channel 6 is by 9 outer wall of central compressed air pipe
It is surrounded with 10 internal face of secondary air channel, the external compression air duct 7 is by 10 outer wall of secondary air channel and external compression air outer tube 11
Inner wall surrounds.The hole that the ventilation casing 8 is formed by bending from water screen tube is stretched into stove, is realized by wall-through sealing device 45
Dynamic sealing；The wall-through sealing device 45 is by refractory metal thermal-insulating sealing box 46, ring cone-shape metallic leak-proof part 47 and ring cowling
Shape fixing piece 48 forms；The ring cowling shape fixing piece 48 is fixed on boiler setting metal casing by the overhanging wing plate of end cap with stud
On, inner cavity nesting fixing internal fills the refractory metal thermal-insulating sealing box 46 of thermal-insulating sealing filler, and port passes through welding
It 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 ring groups
Into 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；Whole device
Sealing precision at wall-through is carried out by connection ring cone-shape metallic leak-proof part 47 and the stud 58 of ring cowling shape fixing piece 48
It adjusts, realizes the dynamic sealing in gap between ventilation casing 8 and wall-through well, keep its axial movement.Described two
Secondary wind nozzle 20 is by Secondary Air showerhead chassis 21, Secondary Air nozzle head cover 22, central compressed air distributor 24, De Laval noz(zle)
25 assemble, and have good detachable replaceability；22 outside wall surface of Secondary Air showerhead chassis and Secondary Air nozzle head cover
The threaded connection of 23 internal faces surrounds Secondary Air nozzle cavity, and the two outer surface is coated with Thermal Barrier Coatings 9 and is thermally shielded guarantor
Shield；8 radial second wind snouts 19 are uniformly provided in 22 circumferential direction of Secondary Air showerhead chassis, there is Secondary Air nozzle take over 23 thereon,
23 outer wall of Secondary Air nozzle take over is connect with 10 inner thread of secondary air channel；The central compressed air distributor 24 is placed in secondary
20 inner cavity of wind nozzle, arrival end inner wall are connect with 9 outer wall thread of central compressed air pipe；Its 8 distribution outlets are uniformly distributed
Each 19 center of overfire air port is directed at, and is welded with De Laval noz(zle) 25.11 exit end face of external compression air hose and two
The opposite end clearance of secondary wind showerhead chassis 22 forms compressed air spout 18.It is empty that the axial-adjustment unit 36 includes external compression
Tracheae axial moving device 37 and Secondary Air nozzle axial moving device 38, two groups of mobile devices are adjusted by fuel tank 39, fuel tank
Valve 40, oil pump 42, reversal valve 42, hydraulic cylinder 43 and hydraulic drive arm 44 are formed；Wherein, respective hydraulic drive arm 44a, 44b
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, respectively by
Oil pump 41a and 41b presses certain speed from 39 draw oil of fuel tank through fuel tank control valve 40a and 40b adjusting control, passes through commutation
Valve 42a and 42b flow into hydraulic cylinder 43a and 43b and push hydraulic drive arm 44a and 44b movement, so as to fulfill external compression air hose 11
With the axial movement of Secondary Air nozzle 20, by adjusting the amount of movement of this two groups of axial moving devices, compressed air spout is realized
The adjusting of the distance of 18 size, the distance away from water-cooling wall and overfire air port 19 away from water-cooling wall.The connection flexible pipe 34 is resistant to
High temperature shares three, wherein：Connection flexible pipe 34a and 34c respectively by central compressed air pipe take over 31 and external compression air hose into
Wind take over 33 is all connected with compressed air inlet 26, low-pressure air entrance 27 by hose coupling 35；Connection flexible pipe 34b is by two
Secondary air hose air inlet take over 32 is connected with Secondary Air liaison tube 29 by hose coupling 35；The flexible connection of connection flexible pipe 34 can
Meet relative motion of the ventilation 8 each pipe of casing between each air intake vent when being adjusted axially, be conducive to the realization being adjusted axially.
What Fig. 4 was provided is a specific embodiment of patent of the present invention.According to boiler capacity and each position extent of corrosion,
The adherent wind apparatus number of plies of reasonable Arrangement and every layer of adherent wind cell arrangement quantity on boiler side wall.Secondary Air is from Secondary Air entrance
28 enter Secondary Air liaison tube 29, pass through connection flexible pipe after the adjusting of regulating valve 50 of the allocated and Secondary Air liaison tube distribution outlet
34b enters the wind 32 introducing secondary air channel 6 of take over from secondary air channel；Compressed air (or low-pressure air) from compressed air inlet 26 (or
Low-pressure air 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 flexible pipe 34a and 34c enter the wind take over 31 through central compressed air pipe and external compression air hose enter the wind take over 33, respectively enter
Central compressed air channel 5 and external compression air duct 7；After the Secondary Air of heat flows through secondary air channel, temperature reduces, through secondary
Wind nozzle cavity from overfire air port spray when, enhance the cooling effect of Secondary Air nozzle；Into central compressed air channel 5
In compressed air flow through the central compressed air distributor 24 of 20 inner cavity of Secondary Air nozzle after, from its distribute port of export Laval
25 supersonic speed of jet pipe sprays, and the Secondary Air of 20 inner cavity of injection Secondary Air nozzle is from overfire air port 19 along being parallel to 1 side of water-cooling wall
It is sprayed to high speed, Secondary Air air film layer is formed in 1 near zone of water-cooling wall (close to burner hearth side)；Flow through external compression air duct 7
Compressed air, compressed air port 18 be parallel to 1 direction of water-cooling wall at a high speed spray, formed compressed air air film layer it is (close
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, also
Water cooling wall temperature can be reduced to a certain degree, and then prevents the generation of water wall high temperature corrosion very well.Wherein, compressed air passes through
Your 25 supersonic speed of pipe of valve is drawn to spray to spray at a high speed under the dual ejector action to Secondary Air with compressed air port 18, Secondary Air
Rigidity is able to greatly enhance (relative to the high speed winds of single compressed air spout), forms the good secondary general mood of coverage area
The secondary air flow that film layer is consumed is greatly decreased；In addition, the compressed air of two compressed air channels is by good preheating, very well
Reduce low temperature compressed air to combustion effects in stove.
TT＆C system 49 described in Fig. 4 is by regulating valve 50, flow sensor 51, temperature sensor 52, CO concentration sensors
53rd, DCS scattered control systems 57 form；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, flow to compressed air (or low-pressure air) and Secondary Air is realized by controlling to adjust valve 50
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 sensors 53
Output signal (flow F 54, temperature signal T55, CO concentration signal C56), DCS scattered control systems 57 regulation and control section valve 50
Regulation and control are optimized to the operating parameter of Patent equipment with axial-adjustment unit 36.
The foregoing is merely a kind of specific embodiments of patent of the present invention, are not intended to limit the invention, based on this hair
Any modification that bright basis is made, improvement etc., should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of adherent wind method and device for preventing coal-burning boiler water wall high temperature corrosion includes：It is patent cell arrangement, secondary
Wind liaison tube, connection flexible pipe, hose coupling, TT＆C system；The patent cell arrangement is by ventilation casing, fixing bracket, contact
Property fixing bracket, movable end cover, fixed end cap, high-temperature resistant seal ring, Secondary Air nozzle, Thermal Barrier Coatings, wall-through sealing dress
It puts, axial-adjustment unit composition；The ventilation casing is by central compressed air pipe, secondary air channel, external compression air hose suit group
Into secondary air channel is fixed by the contact fixing bracket being mounted on external compression air inside pipe wall, central compressed air pipe and two
It is welded and fixed stent connection between secondary air hose to fix, secondary air channel air intake nozzle is packaged by being welded and fixed end cap, outside
Compressed air hose air intake nozzle carries out dynamic sealing by movable end cover and the high-temperature resistant seal ring being nested on movable end cover；
The hole that is formed by bending from water screen tube of ventilation casing is penetrated in stove, by the wall-through sealing device into action at wall-through
State seals；The Secondary Air nozzle includes：Secondary Air showerhead chassis, central compressed air distributor, is drawn Secondary Air nozzle head cover
Your jet pipe is cut down, has radial second wind snout on the Secondary Air showerhead chassis, Secondary Air nozzle thereon is taken over, and central compressed is empty
Qi leel orchestration input end is connect respectively with the secondary air channel for casing of divulging information and central compressed air pipe screw thread, central compressed air point
Each distribution port of export of orchestration is welded with the De Laval noz(zle) for being directed at each overfire air port center；The external compression air hose goes out
Mouth end face and the opposite end clearance of the Secondary Air showerhead chassis form compressed air spout；The external compression air hose enters stove
The outer surface of section and Secondary Air nozzle is coated with Thermal Barrier Coatings；The axial-adjustment unit is hydraulic drive, including outer
Compressed air hose axial moving device and Secondary Air nozzle axial moving device, two groups of axial moving devices are empty with external compression respectively
The outer wall of tracheae and the outer wall of secondary air channel pass through Stud connection；Ventilation each pipe air inlet of casing welds air inlet and takes over,
It is flexibly connected respectively with Secondary Air liaison tube and compressed air inlet (low-pressure air entrance) by connection flexible pipe, hose coupling；Institute
TT＆C system is stated by being mounted on the regulating valve of each wind upper tube and flow sensor, the temperature on the water-cooling wall of adherent wind region
Sensor and CO concentration sensors, DCS scattered control systems composition.
2. a kind of adherent wind method and device for preventing coal-burning boiler water wall high temperature corrosion according to claim 1,
It is characterized in that, the wall-through sealing device is fixed by refractory metal thermal-insulating sealing box, ring cone-shape metallic leak-proof part and ring cowling shape
Part forms；Ring cowling shape fixing piece is fixed on stud on boiler setting metal casing by the overhanging wing plate of end cap, and inner cavity is nested
Fixed refractory metal thermal-insulating sealing box, port are closely connect by welding with water screen tube fin；The ring cone-shaped metal
Sealing element is formed for two semicircle rings, and ring, which is wrapped up in, is adjacent to external compression air tube outer surface, and being fixed on ring cowling shape by stud fixes
On part；Whole device passes through connection ring cone-shape metallic leak-proof part and the spiral shell of ring cowling shape fixing piece to the sealing precision at wall-through
Column is adjusted.
3. a kind of adherent wind method and device for preventing coal-burning boiler water wall high temperature corrosion according to claim 1,
Be characterized in that, the Secondary Air nozzle be by Secondary Air showerhead chassis, Secondary Air nozzle head cover, central compressed air distributor,
De Laval noz(zle) forms, and Secondary Air showerhead chassis is connected through a screw thread to form Secondary Air nozzle cavity with Secondary Air nozzle head cover,
Central compressed air distributor, De Laval noz(zle) are placed in Secondary Air nozzle cavity；It is uniformly opened in Secondary Air showerhead chassis circumferential direction
There are several radial second wind snouts, Secondary Air nozzle take over outer wall thereon is connect with secondary air channel inner thread；Central compressed
Air distributor input end inner wall is threadedly coupled with central compressed air pipe outer wall, is respectively distributed the port of export and is directed at each Secondary Air spray
Mouth center, is welded with De Laval noz(zle)；Compressed air is sprayed through De Laval noz(zle) supersonic speed, two sprayed to overfire air port
Secondary wind produces extremely strong ejector action；Secondary Air nozzle and Secondary Air jet head sets member have detachable replaceability.
4. a kind of adherent wind method and device for preventing coal-burning boiler water wall high temperature corrosion according to claim 1,
It is characterized in that, the axial-adjustment unit includes external compression air hose axial moving device and Secondary Air nozzle axial movement dress
It puts, sensor output signal is based on by TT＆C system, regulates and controls this two groups of axial moving device amount of movements and each regulating valve, change outer
Compressed air hose, Secondary Air nozzle stretch into the depth of burner hearth and air inlet flow, so as to fulfill being compressed under boiler difference service condition
Air air film layer thickness, flowing velocity and with a distance from water-cooling wall and the optimization tune of the distance of Secondary Air air film leafing water-cooling wall
Section.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711424470.0A CN108151009B (en) | 2017-12-25 | 2017-12-25 | A kind of adherent wind apparatus preventing coal-burning boiler water wall high temperature corrosion |
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| CN201711424470.0A CN108151009B (en) | 2017-12-25 | 2017-12-25 | A kind of adherent wind apparatus preventing coal-burning boiler water wall high temperature corrosion |
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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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| CN108151009B (en) | 2019-04-30 |
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