CN109210779A - A kind of large capacity horizontal water pipe burner hearth fire tube convection heating surface room-fired boiler - Google Patents
A kind of large capacity horizontal water pipe burner hearth fire tube convection heating surface room-fired boiler Download PDFInfo
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- CN109210779A CN109210779A CN201811185665.9A CN201811185665A CN109210779A CN 109210779 A CN109210779 A CN 109210779A CN 201811185665 A CN201811185665 A CN 201811185665A CN 109210779 A CN109210779 A CN 109210779A
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- boiler
- burner hearth
- fire tube
- heating surface
- convection heating
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 238000010438 heat treatment Methods 0.000 title claims abstract description 40
- 239000003054 catalyst Substances 0.000 claims description 22
- 238000001816 cooling Methods 0.000 claims description 12
- 239000000779 smoke Substances 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 210000000038 chest Anatomy 0.000 claims description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 22
- 239000003546 flue gas Substances 0.000 description 22
- 239000012528 membrane Substances 0.000 description 17
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- 229910000831 Steel Inorganic materials 0.000 description 13
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- 230000000052 comparative effect Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 238000005192 partition Methods 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 5
- 238000007689 inspection Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000010010 raising Methods 0.000 description 4
- 229910000851 Alloy steel Inorganic materials 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 235000014171 carbonated beverage Nutrition 0.000 description 3
- 239000002817 coal dust Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229910001562 pearlite Inorganic materials 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 229910003206 NH4VO3 Inorganic materials 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000003250 coal slurry Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000002808 molecular sieve Substances 0.000 description 2
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229910002554 Fe(NO3)3·9H2O Inorganic materials 0.000 description 1
- 206010020843 Hyperthermia Diseases 0.000 description 1
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- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002149 energy-dispersive X-ray emission spectroscopy Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000036031 hyperthermia Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
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- 238000011835 investigation Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 235000012771 pancakes Nutrition 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
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- 238000011084 recovery Methods 0.000 description 1
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- 230000003685 thermal hair damage Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0005—Details for water heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
- F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/10—Nitrogen; Compounds thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2219/00—Treatment devices
- F23J2219/10—Catalytic reduction devices
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
Abstract
The present invention provides a kind of large capacity horizontal water pipe burner hearth fire tube convection heating surface room-fired boiler, which is two-piece unit structure, and superstructure is full fin panel casing water pipe burner hearth, and substructure is fire tube pan shell type convection heating surface and energy-saving appliance.The boiler furnace is with small vibration and harmful gas emission is low.
Description
Technical field
The invention belongs to thermal energy field of combustion technology, are related to a kind of large capacity horizontal water pipe burner hearth fire tube convection heating surface
Room-fired boiler, more particularly, to a kind of horizontal water pipe burner hearth fire tube convection heating surface room fuel oil, gas, coal dust, water-coal-slurry heat
Homogeneous solution-type reactor.
Background technique
Its heating surface of shell boiler is mainly arranged within drum (shell), the carbonated drink medium of heat absorption in heating surface, particularly
It is flowed except heating surface pipe, and exothermic flue gas then flows within pipe, drum is also thus referred to as shell.As heated
The pipe in face, because what is flowed in pipe is flue gas, so referred to as smoke pipe.So-called water-tube boiler refers to that water, vapour or carbonated drink are mixed
Object is closed to flow in pipe, and the boiler that flame or flue gas burn and flowed outside pipe.Water-tube boiler set outside drum water pipe by
Hot face, high-temperature flue gas flow heat release outside pipe, and water absorbs heat in pipe.Due to cross section small, carbonated drink flow velocity outer than pipe in pipe
It greatly increases, the steam generated on heating surface is flushed away immediately, and this provides for improved pot water heat absorption rates.The water compared with smaller hard flour pancake boiler
Pipe boiler drum diameter is small, and operating pressure is high, and pot water capacity is small, and once accident occurs, disaster is lighter, and boiler water cycle is good, steams
It sends out high-efficient, adapts to the better performances of load variations, the thermal efficiency is higher.Therefore, pressure is higher, and the biggish boiler of evaporation capacity is all
Water-tube boiler.
Fin panel casing is the most thorough to the protective effect of furnace wall, therefore furnace wall need to only use thermal insulation material, and does not have to fire proofed wood
Material, greatly reduces furnace wall thickness, weight all, simplifies furnace wall structure, alleviate boiler total weight.Fin panel casing also has
Air-tightness is good, adapts to requirement of the pressure combustion to boiler, is not easy slagging, leak out few, reduction heat loss due to exhaust gas, raising boiler hot
Efficiency.But film-type wall boiler manufacturing process is more complex, the distribution of tube panel thermal stress is more complicated.
CN103398368A discloses a kind of preposition membrane wall burner hearth fire tube convection heating surface large-size horizontal steam boiler, packet
Include burner hearth, burning chamber, shell, rear smoke box and energy-saving appliance, it is characterised in that: burner hearth and horizontal-housing type arrangement, burner hearth are placed in shell
Front side, and be connected with shell, shell is built-in with smoke pipe, and the burner hearth and burning chamber are all made of water pipe membrane wall structure.
CN204006633U discloses a kind of modular convection heating surface fire tube boiler comprising drum, furnace wall, furnace
Arch, fire grate, water-cooling wall, header, down-comer, high temperature threaded flue cylinder and low temperature threaded flue cylinder；Wherein, the drum is in vertical
To setting at top；The furnace wall, chimney arch, fire grate are arranged from top to bottom, and form burner hearth；Burner hearth is arranged in the water-cooling wall
Surrounding, and drum, down-comer form furnace water cooling system；The drum, down-comer, header, water-cooling wall are sequentially connected；It is described
Water-cooling wall is connected with drum, header respectively；The comprising modules formula convection current of both the high temperature threaded flue cylinder, low temperature threaded flue cylinders
Heating surface；The high temperature threaded flue cylinder, low temperature threaded flue cylinder are connected by a gathering tube with drum.
CN105588100B discloses a kind of full film type wall fire tube boiler comprising using the furnace of full film type wall structure
Thorax is fixedly connected on the burner of burner hearth one end, using the turning smoke-box of full film type wall structure, heat exchanger and drum；Wherein, exist
The side of burner hearth is provided with outlet smokestack, and one end connection outlet smokestack, the other end for smoke-box of turning connect heat exchanger, in turning cigarette
Room and the junction of outlet smokestack and heat exchanger are respectively arranged with annular header；The membrane wall water cooling tube of turning smoke-box passes through heat exchange
Annular header at device is connected with the shell of heat exchanger；The film that drum passes through annular header and turning smoke-box at outlet smokestack
Formula wall water cooling tube is connected, meanwhile, drum is directly connected with the membrane wall water cooling tube of burner hearth and forms cycle heat exchange channel.
CN207262473U discloses a kind of large capacity cornue full film type wall grate firing boiler combined type rear arch, belongs to thermal energy work
Journey applied technical field is related specifically to a kind of back arch structure of large capacity cornue full film type wall grate firing boiler.It include: Boiler Furnace
Row, preceding confession, rear arch, it is characterized in that: the rear arch includes rear arch front, rear arch membrane wall, external membrane wall and insulating layer.
CN106705112A discloses a kind of burner hearth membrane wall of boiler comprising housing is installed on the housing
Inspection door, the housing include shell, pour the first thermal insulation layer on the inside of the shell and pour heat-insulated in described first
First high-temperature-resistant layer of layer inside, the inspection door include the inspection door tube socket for being fixed on the housing opening, are installed on institute
State the inspection door body at inspection door tube socket.
CN100408935C discloses a kind of Composite Uniform Flow Design Method Of Angle Pipe Type Boiler Flag Type Convective Heating Surface, it is adopted
With flag formula convection heating surface bundle diameters at different levels are changed, optimizes heating surface heat transfer temperature and pressure and heat transfer area at different levels, directly reduce end
Grade flag formula restrains the composite design methods such as length and circulation area, realizes that the equal flue gas flow rates of flag formula convection heating surfaces at different levels optimize
Design, makes the average flue gas flow rate of heating surfaces at different levels reach 8m/s or more.
CN201900159U discloses a kind of processing tool of boiler film type wall tube screen for bending rows of products, and the processing tool is by side
Mould, intermediate active mould, movable mold backing plate and link block are constituted, and each side set a side form in intermediate active mould, centre is living
Dynamic model is stacked side by side in half slot by half root tube bending and is installed on link block, and link block is connected with movable mold backing plate, phase
Half root tube bending is also equipped with side by side on side form in half slot with answering.
CN203323102U discloses a kind of coiled pipe membrane wall economizer comprising coiled pipe, support card, side plate,
It is characterized by: the coiled pipe is that seamless steel pipe bends molding, fin is used between two neighbouring pipelines of coiled pipe
Piece is welded to connect to form coiled pipe membrane wall, and coiled pipe membrane wall is respectively arranged on the left side and the right side support card, and coiled pipe
The inlet and outlet of membrane wall upper and lower ends are fixedly connected with support card, and the front and back positioned at the support card of the left and right sides connect respectively
Connect side plate.
CN2404060Y discloses a kind of new film type wall hot pipe boiler, and its underpart is by membrane wall wall, water pipe stove
Row, the upper combustion chamber that membrane wall partition forms and the lower combustion chamber being made of water pipe furnace grate, membrane wall partition wall, casting furnace grate, in
By upper and lower membrane wall partition, the high temperature flue formed with membrane wall partition wall, top is by upper membrane wall partition, low temperature in portion
The centre of partition and upper water layer composition is covered with the low-temperature flue gas channel of gravity assisted heat pipe.
" analysis of horizontal shell formula boiler back tube sheet bridge cracks ", Yu Shiyong, " energy and environment ", 2013(6), point
Analyse and discuss the formation of cylindrical horizontal boiler tube sheet high temperature section crackle, producing cause.
" novel pan shell type water-fire tube hot water boiler related safe mass crash analysis ", Zhang Lianfang, " Industrial Boiler ", 2001
(3): 41-42, to the cable-styled water-fire tube hot water boiler operative practice of Novel pot occur two class problems and accident (water screen tube and
Ellipsoidal head tube-plate fracture leakage problems) it analyzes.
" research of heating surface tubes in boilers different steel weld ", Qian Pinyong, " Dongfang Electric comment ", and 1988 (1): 50-60,
In the design of First Domestic 300MW Natural Circulation dum boiler, austenitic stainless steel and 102 dissimilar steel of steel are used for the first time
Pipe with welding point, and generally use the heterogenous steel pipe connector that austenitic stainless steel and 2 (1/4) Cr-1Mo groups are welded with foreign countries
It is compared.
However, in the above prior art, since environmental protection and the demand of high-capacity gas furnace, boiler furnace volume constantly increase
Greatly, cause burner hearth to vibrate, and nitrogen oxides is caused to increase.
Therefore, this field needs the boiler that a kind of burner hearth is with small vibration and discharged nitrous oxides are low.
Summary of the invention
In order to solve the above-mentioned technical problem, the present inventor, by largely simulating and exploring, is led on the basis of further investigation
Co-design is crossed, following technical scheme is provided.
In one aspect of the invention, a kind of large capacity horizontal water pipe burner hearth fire tube convection heating surface room-fired boiler is provided,
It is characterized in that, the boiler is two-piece unit structure, superstructure is full fin panel casing water pipe burner hearth, and substructure is fire tube
Pan shell type convection heating surface and energy-saving appliance.
Preferably, the energy-saving appliance and air preheater are that postposition mode is arranged.
Preferably, burner hearth working medium is forced circulation and complete close structure.
Preferably, the fire tube convection heating surface in burner hearth uses the smoke pipe or fire tube form of screw thread shape.
Preferably, also increase the water conservancy diversion matter of special-shaped heated structure in addition to the threaded flue or fire tube.
Preferably, burner hearth and smoke pipe or fire tube it is heated between connected by water cooling convection pass.
For the present invention, Boiler Convection Heating Surface selve support, burner hearth part are supported by steelframe.
Preferably, the burner hearth of boiler of the invention is multiple hearth structure.
In existing boiler, do not use multiple hearth generally, to find out its cause, on the one hand be to be architectural limitation, water circulation and
Flue gas recirculation, which is difficult to realize to reduce burner hearth, to be averaged heating surface area thermic load, is on the other hand to need to avoid between multiple burners
Thermal current, which interferes with each other, causes localized hyperthermia.This list chamber design can cause nitrogen oxides to increase.
It is highly preferred that the burner hearth of boiler is multiple hearth structure when boiler power is greater than 91MW.
When using multiple hearth structure, preferably increase shield between burner hearth.The use of shield is played reinforcing to burner hearth and is made
With in addition, heating surface increases when increasing shield, being born so as to reduce the burner hearth heating surface area heat that be averaged to reduce vibration
Lotus.
Fire tube pan shell type structure can be used in energy-saving appliance of the invention.
In the present invention, burner hearth and fire tube it is heated between connected by water cooling convection pass, guarantee leakproofness and safety.
Preferably, energy-saving appliance has horizontal tilt angle (angle i.e. between horizontal plane), guarantees that condensed water overflows.More preferably
Ground, the degree at the inclination angle are 10-15 DEG C.
In the prior art, there is not yet the technology at inclination angle is taken to report.The present inventor has found after study, inclines when described
When angle is in the range, it can guarantee that condensed water overflows at the appropriate speed.It is generally believed that the speed that condensed water overflows is faster
Better, however, it was found that when storage has certain condensed water, it is excessive to can be avoided energy-saving appliance internal-external temperature difference, occur so-called " dry combustion method " or
" thermal shock " phenomenon can effectively avoid the generation of energy-saving appliance failure.The specific inclination angle range of degrees is arranged with condensed water
Out with extend energy-saving appliance service life optimal balance.
In fire tube convection heating surface room-fired boiler, heating surface tube production cost account for boiler complete machine production cost 25% with
On, the cost of the part includes that processing cost and maintenance cost have very big influence to entire boiler cost.
The material of general fire tube is 12CrMoV, and this steel alloy belongs to pearlite heatproof steel, and being take Cr, Mo as main close
The low-alloy high-tensile structural steel of alloying element, under supply of material state, Main Tissues are pearlite, in the manufacture of heating surface tube
In be used widely.However, pearlite heatproof steel can be led to the problem of when welding, such as it will appear hardening, cold in heat affected area
Crackle, softening and post weld heat treatment or high temperature will appear reheat crack(ing) defect under the conditions of being used for a long time.These all boiler for producing
Problems are brought, such as need special welding procedure to improve welding cost, increase later period maintenance cost, and
It fails in the use process being likely to occur.
In order to solve the technical problem, the present inventor cooperates with Anshan special steel Group Co., Ltd, to the material of the fire tube
Matter is suitably modified.For this purpose, the heating surface tube in the boiler of the invention, in fire tube convection heating surface room-fired boiler
The material of (i.e. fire tube) is following (being made of following steel), in terms of wt.%: C 0.08 ~ 0.12, Si 0.18 ~ 0.22, Mn
1.20 ~ 1.80, Mo 0.25 ~ 0.35, Cr 1.00 ~ 1.20, W 0.50 ~ 0.80, Ti 0.20 ~ 0.60, Nb 0.15 ~ 0.30, and
The Fe of surplus.
The steel (i.e. steel alloy) suitably increases Cr content on the basis of 12CrMoV, while increasing Ti, W and Nb, generation
For province in addition to V.Although the production cost of the alloy can be slightly above 12CrMoV, as analyzed above, Welder can be made
Skill is simplified, improve fire tube reliability and reduces later maintenance.
In the micro-organization chart of the steel, it can be observed to have the dark, coarse rich in Ti and Nb of sharp edges shape
Primary MC carbide, fracture propagation can be reduced, to reduce the generation of weld crack.With reference to Fig. 5, such as wherein arrow institute
Show, the generation of high tungsten rod-shpaed particle is also observed in microscopic structure, and EDX analysis further demonstrates that these particles by about 96wt%
W and 4wt%Cr composition, the formation of the phase can make steel show good creep ductility, cold cracking occurs when to reducing welding
The probability of line.
Boiler of the invention is preferably equipped with denitrification apparatus.
It is highly preferred that being filled with denitrating catalyst in the nitrogen rejection facility.
Preferably, denitrification apparatus is integrated in energy-saving appliance of the invention.It is highly preferred that filled with de- in the nitrogen rejection facility
Denox catalyst.
Under environmentally friendly implementation dynamics very strict at present, extra high requirement is proposed to the environmental requirement of boiler, very
To the outlet for determining boiler enterprise to a certain extent.Current boiler design has in view of environmental requirement, and novel
Environmental protection technology combine, this is the future developing trend of boiler.
In the existing boiler with denitration function, external flue gas purifying equipment is usually taken.What this mode had
Important drawback is denitration effect difference and capacity usage ratio is low.Because, it is however generally that, denitrating catalyst has certain operating temperature
It is required that and leaving the temperature of the flue gas of energy-saving appliance and/or air preheater is not often the ideal operation temperature for being suitble to catalyst
Degree, it is therefore desirable to reheat, which results in the raising of energy consumption and the raisings of the device is complicated degree.In addition, this mode is integrated
It spends lower, occupies biggish area or volume, do not meet current miniaturization, integrated trend.
For the present invention, by cooperative development, a kind of new high-efficiency denitration catalyst for denitrification apparatus is provided,
The catalyst filled in the denitrification apparatus is particularly preferably the molecular sieve carried catalytic active component FeVO of SSZ-134And CeO2?
The catalyst arrived, can mark and be: FeVO4-CeO2/ SSZ-13.The catalyst that the cooperative development obtains will separately into
Row patent application.
The catalyst can be made by method comprising the following steps: (1) with including Fe (NO3)3·9H2O and NH4VO3
Aqueous solution (Fe (NO3)3·9H2The concentration of O is preferably 0.2-0.5M, NH4VO3Concentration be preferably 0.2-0.8M) dipping SSZ-
13 molecular sieves, it is then 1-5 hours dry at 100-120 DEG C, then at temperature lower calcination 1-3 hours of 650-700 DEG C, be made
FeVO4/ SSZ-13 intermediate；(2) then with including Ce (NO3)3Ammonia spirit (Ce (NO3)3Concentration be preferably 0.1-
0.5M, the pH of ammonia spirit are preferably 11-14) the dipping FeVO4/ SSZ-13 intermediate, it is then dry at 100-120 DEG C
1-2 hours, then at temperature lower calcination 1-3 hours of 500-600 DEG C, catalyst Fe VO is made4-CeO2/ SSZ-13。
Preferably, with the total weight of the catalyst, FeVO4Content be 5-10 wt%, CeO2Content be 1-3wt%.
The catalyst can be applied on the hole wall of the honeycomb ceramics of denitrification apparatus by the cladding process of this field routine, or
It is made particles filled in the catalyst bed of denitrification apparatus.
The denitrification apparatus can use the denitrification apparatus design method of this field routine, such as packed bed mode or honeycomb
Body design.
The catalyst, that is, selective catalysis catalyst (SCR catalyst) has high catalytic activity, with NH3Restore NOx
While be able to suppress N2The formation of O mentions high catalytic reduction towards N2Selectivity.The SSZ-13 carrier is conducive to NH3Absorption
In catalyst surface；FeVO4With extra high catalytic activity, catalytic activity is higher than Fe2O3And VOxMixture；CeO2Tool
There are high catalytic activity and selectivity, and is able to suppress FeVO4Resolve into Fe2O3And VOx, improve the thermostabilization of catalyst
Property.
Preferably, in the present invention there is the energy-saving appliance high-temperature flue gas entry and low-temperature flue gas to export.Preferably, described
Heat-dissipating pipe is installed in energy-saving appliance or cooling fin carries out the heat recovery of high-temperature flue gas.
It is particularly preferred that the denitrification apparatus be arranged in energy-saving appliance slave the road that high-temperature flue gas entry to low-temperature flue gas exports
Between 50% before the preceding 30%- of diameter in the position of range.The study found that if denitrification apparatus is arranged excessively forward, it is excessively high
Flue-gas temperature will cause thermal damage to catalyst of the invention, wherein will lead to the sintering of active component, and if position is arranged
It obtains excessively rearward, then flue-gas temperature is difficult to reach the denitration operating temperature of catalyst, to be difficult to carry out catalytic denitration.
In denitrification apparatus work, the NH as reducing agent3It can be added in flue gas in high-temperature flue gas entry.
Since boiler of the invention is equipped with denitrating catalyst, there is especially extensive suitability of fuel.With regard to the present invention
Boiler for, the applicable fuel of the boiler is selected from one of oil, gas, coal dust, water-coal-slurry or a variety of.
Studies have shown that the efficient denitrifying device uses the 0.1-2% that the content of NOx can be made to be reduced to original content.
The content of NOx is the 0.1-2% of the content of NOx in inlet flue gas i.e. in exiting flue gas.Research also found, when use coal dust, water coal
When slurry is as fuel, which also has catalytic degradation effect to the benzene-like compounds in flue gas.
To sum up, in the present invention, it is designed using twin furnace, reduces burner hearth vibration and pollutant emission.
Additionally or optionally, when using denitrification apparatus of the invention, the discharge amount of NOx can be effectively reduced.Fire tube closes
The use of Jin Gang can make simplified welding procedure, raising fire tube reliability and reduce later maintenance.
Detailed description of the invention
Fig. 1 is the front view for the horizontal single furnace boiler invented at all；
Fig. 2 is the side view for the horizontal single furnace boiler invented at all；
Fig. 3 is the front view for the horizontal twin-furnace boiler invented at all；
Fig. 4 is the side view for the horizontal twin-furnace boiler invented at all；
Fig. 5 is the SEM figure of steel alloy according to the present invention；
In above-mentioned Fig. 1-4, appended drawing reference is as follows: 1 is burner hearth, and 2 be supporting steel frame, and 3 be water outlet header, and 4 be energy-saving appliance, and 5 are
Burner, 6 be convection part, and 7 be water outlet connecting tube.
Specific embodiment
It is to illustrate specific embodiments of the present invention, but the present invention is not limited thereto below.
Embodiment 1
With reference to Fig. 3-4, it is shown that a kind of 150MW large capacity horizontal water pipe twin furnace fire tube convection heating surface room-fired boiler, the pot
Furnace is the design of two-piece unit structure, and superstructure is full fin panel casing water pipe burner hearth, and substructure is the convection current of fire tube pan shell type
Heating surface and energy-saving appliance.Detection discovery, the design of twin furnace can effectively reduce burner hearth and vibrate, and can promote to fire
It burns, reduces the discharge of harmful substance.
Comparative example 1
The boiler of the comparative example and the difference of embodiment 1 are only that single chamber design using constant power.Detection discovery, burner hearth go out
Now obvious vibration, and the discharge amount of harmful substance such as NOx be embodiment 1 approximately twice as.
Embodiment 2
With reference to Fig. 3-4, it is shown that a kind of large capacity horizontal water pipe twin furnace fire tube convection heating surface room-fired boiler, the boiler are upper
Lower separate structure design, superstructure are full fin panel casing water pipe burner hearth, and substructure is fire tube pan shell type convection heating surface
And energy-saving appliance, energy-saving appliance have horizontal tilt angle, the degree at inclination angle is 12 DEG C.
Comparative example 2
With reference to Fig. 3-4, the difference of the comparative example and embodiment 2 is only that energy-saving appliance does not have level inclination.In continuous use 15
Month when, compare 2 heat exchanger tube it is cracked, and the heat exchanger tube of the energy-saving appliance of embodiment 2 continuous use 24 not yet discovery heat exchange
The generation of pipe crack.
The Comparative result of embodiment 2 and comparative example 2 shows the design energy at the specified level inclination angle of energy-saving appliance of the invention
The service life for enough effectively improving energy-saving appliance achieves and exceeds expected good result.
This written description discloses the present invention, including optimal mode using example, and also enables those skilled in the art
The manufacture and use present invention.It is of the invention can patentable scope be defined by the claims, and may include this field skill
Other examples that art personnel expect.If this other examples have not different from the structural elements of the literal language of claims
Element, or if this other examples include the equivalent structure element with the literal language of claims without substantial differences,
Then this other examples are intended within the scope of claims.In the case where not will cause inconsistent degree, by reference to
It will be incorporated herein in place of all references referred to herein.
Claims (10)
1. a kind of large capacity horizontal water pipe burner hearth fire tube convection heating surface room-fired boiler, which is characterized in that the boiler is to divide up and down
Body structure, superstructure are full fin panel casing water pipe burner hearth, and substructure is fire tube pan shell type convection heating surface and energy-saving appliance.
2. boiler according to claim 1, which is characterized in that the energy-saving appliance and air preheater set for postposition mode
It sets.
3. boiler according to claim 1 or 2, which is characterized in that burner hearth working medium is forced circulation and complete close structure.
4. boiler according to any one of the preceding claims, which is characterized in that the fire tube convection heating surface in burner hearth is adopted
With the smoke pipe or fire tube form of screw thread shape.
5. boiler according to claim 4, which is characterized in that it is heated also to increase abnormity in addition to the threaded flue or fire tube
The water conservancy diversion matter of structure.
6. boiler according to claim 4 or 5, which is characterized in that lean on water cooling pair between burner hearth and smoke pipe or fire tube are heated
Flow flue connection.
7. boiler according to any one of the preceding claims, which is characterized in that Boiler Convection Heating Surface selve support, furnace
Thorax point is supported by steelframe.
8. boiler according to any one of the preceding claims, which is characterized in that energy-saving appliance uses fire tube pan shell type structure.
9. boiler according to any one of the preceding claims, which is characterized in that the boiler erection has denitrification apparatus.
10. boiler according to claim 9, which is characterized in that be filled with denitrating catalyst in the nitrogen rejection facility.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811185665.9A CN109210779A (en) | 2018-10-11 | 2018-10-11 | A kind of large capacity horizontal water pipe burner hearth fire tube convection heating surface room-fired boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811185665.9A CN109210779A (en) | 2018-10-11 | 2018-10-11 | A kind of large capacity horizontal water pipe burner hearth fire tube convection heating surface room-fired boiler |
Publications (1)
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| CN109210779A true CN109210779A (en) | 2019-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811185665.9A Pending CN109210779A (en) | 2018-10-11 | 2018-10-11 | A kind of large capacity horizontal water pipe burner hearth fire tube convection heating surface room-fired boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114111031A (en) * | 2021-12-08 | 2022-03-01 | 新疆八一钢铁股份有限公司 | Gas type internal combustion boiler with adjustable heating surface |
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| JP2002177741A (en) * | 2000-12-18 | 2002-06-25 | Miura Co Ltd | Method of controlling denitration apparatus in boiler |
| JP3407318B2 (en) * | 1992-11-09 | 2003-05-19 | バブ日立工業株式会社 | High efficiency quick start boiler equipment |
| CN201621844U (en) * | 2010-04-06 | 2010-11-03 | 山西蓝天环保设备有限公司 | Horizontal pipe frame forced circulation coal powder burning hot water boiler |
| CN102052765A (en) * | 2011-01-07 | 2011-05-11 | 扬州晨光特种设备有限公司 | Radiant heat-conducting boiler |
| CN103363663A (en) * | 2013-07-26 | 2013-10-23 | 江苏双良锅炉有限公司 | Large-module assembled high-efficiency condensing gas-fired hot water boiler |
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| JP3407318B2 (en) * | 1992-11-09 | 2003-05-19 | バブ日立工業株式会社 | High efficiency quick start boiler equipment |
| JP2002177741A (en) * | 2000-12-18 | 2002-06-25 | Miura Co Ltd | Method of controlling denitration apparatus in boiler |
| CN201621844U (en) * | 2010-04-06 | 2010-11-03 | 山西蓝天环保设备有限公司 | Horizontal pipe frame forced circulation coal powder burning hot water boiler |
| CN102052765A (en) * | 2011-01-07 | 2011-05-11 | 扬州晨光特种设备有限公司 | Radiant heat-conducting boiler |
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| CN114111031A (en) * | 2021-12-08 | 2022-03-01 | 新疆八一钢铁股份有限公司 | Gas type internal combustion boiler with adjustable heating surface |
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