CN107120631A - It is substantially reduced the oil burning boiler of nitrogen oxides generation - Google Patents

It is substantially reduced the oil burning boiler of nitrogen oxides generation Download PDF

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Publication number
CN107120631A
CN107120631A CN201710453879.9A CN201710453879A CN107120631A CN 107120631 A CN107120631 A CN 107120631A CN 201710453879 A CN201710453879 A CN 201710453879A CN 107120631 A CN107120631 A CN 107120631A
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CN
China
Prior art keywords
air
gas
pipe
boiler
flue
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Granted
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CN201710453879.9A
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Chinese (zh)
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CN107120631B (en
Inventor
范高峰
樊岱娇
欧阳晓瑞
马慧敏
张兆磊
徐静
徐梅
董磊
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Henan Enthalpy New Material Co ltd
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Individual
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Publication of CN107120631B publication Critical patent/CN107120631B/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B21/00—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/10—Water tubes; Accessories therefor
    • F22B37/101—Tubes having fins or ribs
    • F22B37/102—Walls built-up from finned tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/34—Adaptations of boilers for promoting water circulation
    • 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 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • 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 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F23C9/06—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for completing combustion
    • 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
    • F23J15/006—Layout of treatment plant
    • 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
    • F23J15/04—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
    • 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
    • F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
    • 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
    • F23L15/00—Heating of air supplied for combustion
    • 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 
    • F23C2202/00—Fluegas recirculation
    • F23C2202/30—Premixing fluegas with combustion air
    • 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
    • F23J2215/20—Sulfur; 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 
    • F23J2215/00—Preventing emissions
    • F23J2215/30—Halogen; Compounds thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

It is substantially reduced the oil burning boiler of nitrogen oxides generation, including boiler body, boiler body inner right side is burner hearth, boiler body front portion is provided with the boiler-burner extending into burner hearth, some spiral finned tubes are evenly arranged with the inside of the water cooled membrane wall of burner hearth surrounding, water cooled membrane wall and spiral finned tube are in freeze profile into compound water-cooled furnace, and the top and bottom of spiral finned tube are respectively protruding into upper drum and lower drum；Connected between boiler nozzle and boiler-burner by fume treatment hybrid system；Fume treatment hybrid system includes air preheater, flue gas plenum chamber, air plenum chamber, desulfurizing device, quick lime drier, cigarette oxygen mixed once device, air blower and cigarette oxygen secondary mixer.The present invention makes the discharge of nitrogen oxides of the boiler in fuel oil, in the case where not using special denitrification apparatus, can also reach the discharge value of national requirements by reducing fire box temperature and control burning two kinds of measures of oxygen-supplying amount.

Description

It is substantially reduced the oil burning boiler of nitrogen oxides generation
Technical field
The invention belongs to boiler technology field, more particularly to a kind of oil burning boiler for being substantially reduced nitrogen oxides generation.
Background technology
For a long time, China is always using coal as main energy sources, and coal-burning boiler is largely used, and forms coal smoke type air dirty Dye, the haze weather especially occurred more in recent years further promotes the energy policy and energy resource structure of China to make the transition as early as possible. The coal-fired industry of current China and the usage amount of domestic boiler are huge, are the important pollution sources of China's haze weather, therefore I The big or middle city of some of state has been formulated in the recent period to be changed to fuel oil industry or life coal-burning boiler or fires the boiler policy of natural gas, The conspicuous contradiction between boiler fired coal and environment so can be not only solved, and in the various petroleum import pipelines of country's laying It is also exercisable under background, in policy, the policy meeting of boiler " coal changes oil " or " coal changes gas " in the current and quite a while Keep continuity.
At present in oil burning boiler, the SZS oil burning boiler enormous amounts that industry and boiler for domestic are used are primarily due to it Simple in construction, automaticity is high, and production and the cycle installed are short, the especially strong adaptability of medium small boiler, therefore firmly get The favor of user, the occupation rate of in the market is increasing.With country and local government to combustion coal fired boiler limitation scope and Tonnage is increasing, and SZS type boilers have welcome the great development phase, and the typical structure of this boiler mainly includes two parts, boiler Side is the burner hearth of biasing, and burner hearth end arrangement burner, burner hearth is used as the space for providing fuel combustion, burner hearth surrounding arrangement water Cold membrane wall heating surface, these heating surfaces play heat absorption and sealedly effect, because these heating surfaces mainly absorb the spoke of flame Penetrate heat, therefore referred to as radiation heating-surface；Opposite side arranges superheater and convection bank or only convection bank, and these heating surfaces are used To absorb flow of flue gas liberated heat, convection heating surface is referred to as, the surrounding of the two parts is all entered with water cooled membrane wall Gone sealing, can so have been dispatched from the factory as entirety after boiler manfacturing unit is assembled, to scene after be easily installed, shorten and install Time, it is user-friendly.During the design and use of this boiler, due to structure and the limitation of transport, the stove of boiler It is smaller that thorax is typically designed, and liberated heat can not be by the monolayer film type water cooling of surrounding in burner hearth internal-combustion for such fuel Wall is absorbed in time, and the temperature caused inside burner hearth is very high, and 1400 °C or so can be reached sometimes, and so occurring two mainly asks Topic：One be due to temperature more than 1200 degree, boiler heating power type oxynitrides is largely produced, and current environmental protection policy phase It is contrary to, in order to reduce the generation of oxynitrides, burning only reduces the supply of oxygen, causes fuel combustion endless as far as possible Entirely, substantial amounts of CO is generated, fuel is not only wasted, and boiler operator is also dangerous；Two be the furnace outlet of boiler And later convection heating surface arrangement is more difficult, is mainly manifested in two aspects：One is too high due to flue gas temperature of hearth outlet, Superheater can not be arranged at furnace outlet, it is to avoid superheater is burnt out, this and superheater need to be arranged in cigarette temperature highest point Theory is runed counter to, and if be arranged in furnace outlet when superheater is installed, can be positioned on superheater two sides, it is easy to install and Check, a part of convection bank of arrangement protection superheater at i.e. furnace outlet must be taken before superheater at present, is overheated Device can only observe the situation towards the superheater of boiler exterior when installing, because another side does not have against burner hearth membrane wall Method is positioned and checked；Second, because flue gas temperature of hearth outlet is too high（What is had reaches 1400 °C or so）, in order to reduce The flue-gas temperature of boiler export, it has to arrange convection heating surface more, this and need to design compact boiler volume and be easy to fortune Theory that is defeated and installing is runed counter to, and result is that a part of heating surface is moved on to outside boiler, increases boiler energy-saving heating surface, no matter increases Plus part heating surface, if because the heat-transfer intensity of convection heating surface is more many than radiant heat transfer, in same exhaust gas temperature situation Under, absorb same heat, the steel consumption of convection heating surface is all big more, is unfavorable for the energy-saving of boiler, in summary two Point can be seen that.For SZS types oil burning boiler due to structure and the limitation of transport, the individual layer water cooling film of traditional burner hearth surrounding arrangement Formula wall heat absorption capacity is limited, causes the temperature in boiler furnace too high and flue gas temperature of hearth outlet is too high, temperature mistake in burner hearth Height adds the generation of oxynitrides, although can reduce the generation of oxynitrides using the method for low supply oxygen amount, but It is that but result in fuel combustion not exclusively, flue gas temperature of hearth outlet is too high to make heating surface difficult arrangement, adds the whole of boiler Body steel consumption and installation difficulty, are unfavorable for the energy-saving of boiler.
Another key point is to reduce the oxygen content of boiler in discharged nitrous oxides are reduced, but is due to that oil burning boiler exists In order to there is more preferable atomization to fuel oil, reached by increasing the method for air capacity and air pressure under normal circumstances during burning , but relatively low in boiler load is that the air capacity that boiler combustion needs also is decreased, and can so cause fuel-oil atmozation bad, The insufficient situation of burning occurs, in this case, is only improved and reaches preferable atomizing effect for air capacity, therefore at present General method is the technology using flue gas recirculation, on the one hand increases the amount of atomization gas, does not on the other hand increase oxygen supply again Amount, is reached when boiler load is relatively low with this, does not cause the increase of boiler oxynitrides because of the relative increase of oxygen-supplying amount. Therefore it is effectively in the discharge of the nitrogen oxides of reduction boiler using flue gas recirculating technique.But followed again using flue gas There are two unavoidable problems during ring, this Technique Popularizing is got up more difficult, first is etching problem, after fuel combustion Contain sulphur and other pollutants in flue gas, sulphur is existed in flue gas always, while to avoid containing excessive moisture in flue gas, Therefore when using flue gas recirculation, contain corrosion sulphur in the flue gas of extraction and flue gas will be dried, because air themperature is normal temperature, Although the temperature of flue gas is general after 120 DEG C or so, flue gas and air mixing, the ratio of flue gas is less, mixed gas Temperature is usually that below acid dew point, corruption is carried out to fan blade first when entering air blower after such air and flue gas mixing Erosion, into corroding during air preheater in pipe in air preheater, air preheater again, pipe inside smoke temperature is high, and tube wall is thin, corrodes quickly Leakage, once the measure reduction leakage cigarette by closure air preheater pipe is taken occurs for leakage, causes the rapid liter of exhaust gas temperature On the one hand height, so waste fuel, reduces blowing out of having to after efficiency, therefore a large amount of leakages and air preheater is repaired or replaced, Cause big economic loss.Second be the mixture homogeneity of air and flue gas not enough, the oxygen content in injection burner hearth locally reaches Required less than regulation, cause to support that the efficiency of fuel combustion is inadequate in burner hearth；3rd makes cigarette due to unburnt presence The more imflammable gas CO contained in gas is discharged in air to be wasted in vain, and pollutes air.
The content of the invention
There is provided one in order to solve oxygen-supplying amount more technological difficulties when high ignition temperature in the prior art and burning by the present invention Kind be substantially reduced the oil burning boiler of nitrogen oxides generation, set in boiler space limited inside the burner hearth spiral finned tube with Burner hearth internal temperature is reduced to reduce NO_x formation, and is utilized by flue gas recirculation, be well mixed air and flue gas, Sulfur limitation effect is good, can fire waste heat in flue gas and CO recyclings, the corrosivity of abundant reduction mixed gas, further reduction Oxygen content in burner, so as to reduce NO_x formation.
In order to solve the above technical problems, the present invention is adopted the following technical scheme that：It is substantially reduced the fuel oil of nitrogen oxides generation Boiler, including boiler body, boiler body inner right side are burner hearth, and boiler body front portion right side opening is provided with burner mounting hole, Boiler-burner is installed, burner hearth surrounding inwall is provided with the left of water cooled membrane wall, boiler body and set in burner mounting hole There are upper drum and lower drum, being connected by convection bank between upper drum and lower drum, burner hearth outlet flue is arranged on left side Water cooled membrane wall rear portion, is provided with superheater between upper drum and lower drum and at burner hearth outlet flue, and boiler body is left Forequarter is provided with the inside of boiler nozzle, the water cooled membrane wall of burner hearth surrounding and is evenly arranged with some spiral finned tubes, water Cold membrane wall is encircled into outer burner hearth, and these spiral finned tubes are encircled into internal furnace, and water cooled membrane wall and spiral finned tube are in burner hearth Interior to form compound water-cooled furnace, every spiral finned tube vertical direction between upper drum and lower drum is arranged, spiral finned tube Distance between water cooled membrane wall is more than the water pipe caliber of water cooled membrane wall, and the upper end of all spiral finned tubes is extend into In drum, the lower end of all spiral finned tubes is extend into lower drum, and spiral finned tube extend into upper drum and lower drum Interior length is not more than 10mm；Install boiler when, spiral finned tube prior to water cooled membrane wall assemble in place, spiral finned tube with Water cooled membrane wall carries out compound water cooling to burner hearth, makes the fibre selection of burner hearth outlet flue below 950 °C；
Connected between boiler nozzle and boiler-burner by fume treatment hybrid system；Fume treatment hybrid system includes sky Pre- device, flue gas plenum chamber, air plenum chamber, desulfurizing device, quick lime drier, cigarette oxygen mixed once device, air blower and cigarette oxygen Secondary mixer；
Boiler nozzle is connected by the High Temperature Gas import of the first flue and air preheater, and the air outlet of air preheater passes through The air inlet connection of first air duct and air plenum chamber, the low temperature gas outlet of air preheater passes through the second flue and sulphur removal The air inlet connection of device, the gas outlet of desulfurizing device is connected by the 3rd flue with the middle part of flue gas plenum chamber, flue gas The top of plenum chamber is connected by the 4th flue with the air inlet of quick lime drier, and the gas outlet of quick lime drier leads to The gas approach that the 5th flue is crossed with cigarette oxygen mixed once device is connected, and air plenum chamber passes through the second air duct and cigarette oxygen The air intlet connection of mixed once device, cigarette oxygen mixed once device is connected by the air inlet of the first mixing duct and air blower, The air outlet of air blower is connected by the second mixing duct with the combi inlet port of cigarette oxygen secondary mixer, cigarette oxygen secondary mixer Air intlet be connected by the 3rd air duct with air plenum chamber, the mixed gas outlet of cigarette oxygen secondary mixer is connected with mixed Gas air supply pipe is closed, the outlet of mixed gas air supply pipe and the air inlet lines of burner are connected；
It is provided with 5th flue on smoke regulating valve, the 3rd air duct and is provided with air secondary mixing regulating valve, the It is provided with two mixing ducts on the first oxygen content sensor, mixed gas air supply pipe and is provided with mixed gas regulating valve and Two oxygen content sensors, the second oxygen content sensor is located between mixed gas regulating valve and cigarette oxygen secondary mixer.
Flue gas plenum chamber includes flue gas exhalant and the cylinder in rectangular parallelepiped structure, and cylinder top and bottom are open, cylinder The wide upper encloser in square taper under point is provided with the top of body, cylinder body bottom is provided with the upper wide lower encioser in square taper of lower point, Flue gas exhalant is horizontally set on the middle part in cylinder, and the gas outlet of flue gas exhalant is fixedly connected and sealed with cylinder inboard wall Stifled, the air inlet of flue gas exhalant stretches out cylinder and is connected with the gas outlet of the 3rd flue, and flue gas exhalant is in cylinder Bottom uniformly offer air dispelling hole along its length；The inwall of cylinder, upper encloser and lower encioser is coated with anticorrosion insulation It is connected at the top of layer, upper encloser with the import of the 4th flue, lower encioser bottom is connected with the row of being provided with delivery pipe, delivery pipe Put valve.
Cigarette oxygen mixed once device includes gas mixed box, gather qi together and mixes gas hood, smoke inlet pipe, two air intake ducts and one Root gaseous mixture escape pipe, gas mixed box is encircled into cuboid by upper boxboard, lower boxboard, left boxboard, right boxboard, preceding boxboard and rearing-box plate Shape, smoke inlet pipe and gaseous mixture escape pipe are horizontally disposed with left-right direction, and gather qi together mixes gas hood, smoke inlet pipe and mixing The center line of gas escape pipe is overlapped, and the left end of smoke inlet pipe stretches out in the middle part of left boxboard and connected with the gas outlet of the 5th flue Connect, the right-hand member of smoke inlet pipe is fixed and is tightly connected with right boxboard left side wall, the gas outlets of two air intake ducts respectively with Connected in the middle part of preceding boxboard and in the middle part of rearing-box plate, the gas outlet of the air inlets of two air intake ducts with the second air duct connects Connect, be provided with gas mixed box by be divided into successively from the front to the back inside gas mixed box ante-chamber, hybrid chamber and back cavity preceding dividing plate and after Dividing plate, preceding dividing plate is located at the front side of smoke inlet pipe, and rear bulkhead is located at the rear side of smoke inlet pipe, the left end of gaseous mixture escape pipe Fix and be tightly connected with right boxboard right side wall, gather qi together mixes the profile of gas hood in left thick right thin conical structure, and gather qi together mixes gas The left side of cover is fixedly connected with left boxboard, and the right-hand member edge that gather qi together mixes gas hood is fixedly connected with the outer wall of gaseous mixture escape pipe；
Along the circumferential direction uniformly offer several cigarette gas entering openings in gas mixed box on smoke inlet pipe, preceding dividing plate and after every Offered on plate and offer what several connected hybrid chamber and the mixed gas hood inside of gather qi together on several sky gas entering openings, right plate The gaseous mixture steam vent inside the mixed gas hood of gather qi together, gaseous mixture outlet are offered on gaseous mixture venthole, gaseous mixture escape pipe The gas outlet of pipe is connected with the air inlet of the first mixing duct.
Cigarette oxygen secondary mixer includes air jet pipe, transition conduit, jet pipe and the mixing exhalant of coaxial setting, air jet pipe Air inlet be connected with the gas outlet of the second mixing duct, the air inlet of the gas outlet of air jet pipe and jet pipe is connected, jet pipe Gas outlet and the air inlet of transition conduit connect, the gas outlet of transition conduit be connected with the air inlet of mixing exhalant, is mixed and is dissipated The gas outlet of pipe is connected with the air inlet of mixed gas air supply pipe, and jet pipe is more than the circular cone barrel structure of gas outlet in air inlet, Jet pipe, which is more than in gas outlet on the circular cone barrel structure of air inlet, transitional cylinder, is connected with drainage tube, and the inlet end of drainage tube is neighbouring Jet pipe side, the air inlet of drainage tube is connected with the gas outlet of the 3rd air duct.
Desulfurizing device, which includes being horizontally disposed with sulphur removal case, suction pump, liquid suction pipe and shower plate, sulphur removal case, to be had in sulphur removal case Part is divided into the orifice plate of top spray chamber and the fluid reservoir of bottom, and shower plate is hollow structure, and shower plate is horizontally set on sulphur removal Box top inwall, shower plate is hollow structure, and shower plate lower surface is evenly arranged with several shower nozzles, and shower plate lower surface edge is hung down Nogata is to being provided with least three pieces overhead gages, and orifice plate upper surface has been arranged in vertical at least three pieces lower baffle plates, overhead gage and The front side of lower baffle plate and rear side are fixedly connected with the front inner wall and rear side inwall of sulphur removal case respectively, and overhead gage is uniform with lower baffle plate It is arranged at intervals, gap, the left side of sulphur removal case and right side difference is respectively provided between overhead gage and orifice plate, between lower baffle plate and shower plate It is connected with the gas outlet of the second flue and the air inlet of the 3rd flue；
Alkaline solution is loaded with the fluid reservoir of sulphur removal case, suction pump is located on the left of sulphur removal case, and the import of suction pump, which is connected with, stretches Enter the suction tube to alkaline solution top, the outlet of suction pump and the import of liquid suction pipe are connected, the upper parallel setting of liquid suction pipe At the top of sulphur removal case, liquid suction pipe is connected by some separating tubes with the inside of shower plate；
The lower liquid level gauge positioned at suction tube top and the upper liquid level gauge positioned at orifice plate lower surface are provided with the fluid reservoir of sulphur removal case, Sulphur removal case lower right side offers and is provided with closure plate at alkaline solution addition mouth, alkaline solution addition mouth；
Deflector is provided with the fluid reservoir of sulphur removal case, deflector is located above suction tube and deflector is tilted in right low left high and set Put, the edge in the left side of deflector, front side and rear side respectively with the left of sulphur removal case, the inwall of front side and rear side is fixedly connected.
Quick lime drier includes drying box, and the top of drying box is in up-small and down-big rectangular pyramid structure, drying box Bottom is in that left and right horizontal direction is provided with upper strata track and lower floor's track in up big and down small rectangular pyramid structure, drying box, Upper strata gliding in tracks is provided with framework and underframe, upper framework and underframe is equipped with quick lime ball by mesh bag, does The right side opening of dry case, which is provided with, to be used to be provided with sealing plate at the opening of framework and underframe on horizontal pulling, opening.
The booster fan positioned at quick lime drier air outlet side is provided with 5th flue.
Spiral finned tube is made up of helix fin tube body and fin, and helix fin tube body and fin use a kind of metal Material is integrally formed by hot rolling technology, and by multiple roll-in formed uniform pitch spiral finned tube, fin section into It is trapezoidal, fin helix fin tube body axial direction into spiral yarn shaped.
Also include being used to strengthen the supercharging water injector of cooling water circulation flowing velocity in spiral finned tube；
Be pressurized water injector include the first mounting bracket, the second mounting bracket, two feed pumps and two feed pipes, the first mounting bracket and Second mounting bracket is arranged at lower drum inner bottom part, and two feed pipes are along the direction with lower drum centerline parallel by lower drum Rear end is extend into lower drum, and two feed pipes are separately mounted on the first mounting bracket and by U-bolt, pad and nut On two mounting brackets, the front end closure of feed pipe, the rear end of every feed pipe is corresponded to be connected with the delivery port of a feed pump, and two It is respectively arranged with root feed pipe between a control valve being located at outside boiler body, two feed pipes and passes through some companies Adapter connection, wherein some playpipes are connected with a feed pipe along its length, the jet and one of every playpipe Root helix fin infratubal port is corresponding, and the distance between jet and helix fin infratubal port of playpipe are 2-4mm, injection The internal diameter of the jet of pipe is 3-5mm.
Spiral finned tube is used from burner mounting hole to the direction of burner hearth outlet flue gradually from sparse to dense again to thin cloth Put mode, the water pipe of spiral finned tube and water cooled membrane wall is interval-staggered.
Using above-mentioned technical proposal, the present invention reduces the generation of nitrogen oxides using two kinds of measures：First, reduce in burner hearth Portion's temperature；Second uses the flue gas discharged to reduce the oxygen content in air after being mixed with air, is carried to boiler-burner interior circulation For the relatively low air of oxygen content, while by unburned complete CO recyclings in flue gas.
The specific principle of the first measure and technical measures are：
In the burner hearth surrounding water cooled membrane pars intramuralis of oil burning boiler, arrangement installs water cooling tube in bulk, equivalent in original stove A water-cooled furnace is added on the basis of thorax, in order to make full use of the space that burner hearth is limited, the water cooling tube of arrangement uses spiral fin Piece pipe, spiral finned tube is formed using overall hot rolling, increases the endotherm area of fire side, in order to not influence water cooled membrane wall Heat absorption, the spiral finned tube outer of arrangement is at least more than the caliber of the water pipe of a membrane wall, and spiral fin apart from membrane wall The water pipe of piece pipe and water cooled membrane wall is interval-staggered, and the temperature in burner hearth to be reduced to 950 by the quantity of spiral finned tube It is advisable below DEG C, such temperature can be very good to control the generation of nitrogen oxides, while can be arranged in burner hearth outlet flue again Hot device, it is to avoid because the thermic load of superheater is too big, superheated steam heat absorption capacity is poor and causes booster, due to sufficiently make use of The space of radiation heat transfer in burner hearth, can be increased without the volume of burner hearth and boiler, can when maintaining same exhaust gas temperature To reduce the arrangement of convection bank between upper drum and lower drum, the steel consumption of boiler and the overall weight and body of boiler are reduced Product.
Specific increase boiler extension water-cooled furnace method is as follows：In the water cooled membrane wall of burner hearth surrounding, against water cooled membrane The place of wall, increases water cooling tube, forms internal separate tube burner hearth, and original water cooled membrane wall composition is combined the stove of water-cooling structure Thorax, internal water cooling tube can be light pipe or extended surface tube composition, and the present invention is preferential to use globality spiral finned tube, such a spiral Extended surface tube forms spiral finned tube by hot rolling technology, and by multiple roll-in, and helix fin tube body and fin are one Body formed, without welding, therefore material is identical between fin and helix fin tube body, and in echelon, fin is in spiral shell for fin section The axial direction of fin tube body is revolved into spiral yarn shaped, and such a structure is beneficial to the disturbance when diffusion and flue gas heat transfer of heat, because The heat transfer coefficient of this spiral finned tube is very high, and unit length heat transfer area is big, can arrange less in limited space Helix fin tube body quantity increase heating surface area but at double.Because oil burning boiler is with upper drum and lower drum arrangement Structure, can directly be through spiral finned tube in the middle of upper drum and lower drum, using plug in construction, spiral finned tube it is upper End and bottom penetrate drum wall and are deep into inside drum, so can ensure spiral finned tube in upper pot in boiler operatiopn End in cylinder and lower drum is buried in water, it is ensured that the safety heat exchange of upper drum and lower drum when carrying out radiation heat transfer, spiral shell Revolve extended surface tube to connect with drum by the way of closing welding inside drum, the length that spiral finned tube is stretched into inside drum should No more than 10mm is advisable, and the spiral finned tube outer arranged inside burner hearth is at least more than a membrane wall apart from burner hearth membrane wall Water pipe caliber, the quantity of spiral finned tube is advisable so that the temperature in boiler furnace is reduced to less than 950 degree（This temperature On the one hand radiation heat transfer can be met, the generation of oxynitrides can be reduced again）, while the intensity that should meet boiler drum will Ask, meet after both the above requirement, the spiral finned tubes of internal layer burner hearths should be arranged as far as possible, in order to not influence the combustion of fuel more Temperature is burnt, the arrangement quantity of spiral finned tube should be suitably reduced near burner mounting hole, is being installed on the inside of water cooled membrane wall Spiral finned tube when, should prior to water cooled membrane wall assembling in place.
Because the heat transfer in burner hearth belongs to radiant heat transfer, calorific intensity is big, in order to increase the security of water circulation, in internal layer stove Arrangement supercharging water injector, sets control valve on feed pipe at the helix fin infratubal port of thorax, and this control valve is in fortune Standard-sized sheet is kept during row, the how many size Controls by water jet of resistance of water spray close control valve in boiler shutdown, Playpipe is set on feed pipe, and the jet of playpipe is corresponding with helix fin infratubal port, the jet distance of playpipe Helix fin infratubal port is maintained at 3mm or so preferably, and the jet size of playpipe is generally kept in 3-5mm preferably, allows spray Penetrate the water under high pressure that the jet of pipe gushes out（The meter per second of flow velocity about 5）, the Water circulation hydrodynamics being likely to occur to spiral finned tube are not enough Compensation is provided, it is ensured that the high reliability of spiral finned tube water circulation, so as to be easier the temperature in reduction burner hearth.In addition, this hair It is bright middle using being connected between two feed pumps and two feed pipes, and two feed pipes by some connecting tubes, so not The flow velocity that playpipe sprays water can be only greatly enhanced, and when a feed pump breaks down or overhauled, another may be used also To work on, so that the uninterrupted progress of the operation of pressurized water, it is ensured that big fluctuation does not occur for the temperature in burner hearth.
After compound water-cooled furnace, if boiler carries superheater, superheater can be directly arranged at furnace outlet, Without first arranging convection bank in furnace outlet by original arrangement, superheater is then arranged again, superheater is facilitated Install and check, for same boiler export flue-gas temperature, the volume of boiler with less arrangement convection bank, can be reduced, The overall steel consumption of boiler is reduced, the overall performance of boiler is not reduced.
The specific supply flow of air of second of measure required for into burner hearth be：The high temperature cigarette produced in boiler body Gas enters air preheater to the air heat exchange that is preheated by air preheater by the first flue, and the flue gas of heat exchange passes through Second flue enters to be sprayed and sulphur removal in desulfurizing device, and then flue gas is entered in plenum chamber, most flue gas Discharged by the delivery pipe of lower encioser bottom, and can be by discharging valve regulation mass rate of emission, a small amount of flue gas passes through the 4th fume pipe Road is entered to be adsorbed in quick lime drier to the steam in flue gas, and dried flue gas is entered by the 5th flue In smoke inlet pipe in cigarette oxygen mixed once device；Air preheat simultaneously after is entered in air plenum chamber, most sky Gas is entered in cigarette oxygen mixed once device by the second air duct and two air intake ducts, the flue gas in cigarette oxygen mixed once device Carry out being sent to mixed gas through the second mixing duct in cigarette oxygen secondary mixer by air blower after uniformly mixing with air, when the One oxygen content sensor detect mixed gas oxygen content it is less when, open air secondary mixing regulating valve, air is by the Three air ducts and drainage tube are entered to be mixed again in cigarette oxygen secondary mixer, is detected through the second oxygen content sensor Oxygen content in mixed gas reaches after regulation requirement that fixed air secondary mixes the aperture of regulating valve；Qualified mixed gas It is last to be supplied from mixed gas air supply pipe to boiler body furnace front burner.
The principle of desulfurizing device and it act as：Because the flue gas discharged in oil burning boiler contains many SO2, the present invention adopts With the mode of spray sulphur removal, flue gas is entered by the left side of sulphur removal case, is sequentially passed through formation baffling between overhead gage and lower baffle plate and is led to Discharged behind road by the right side of sulphur removal case, at the same time, suction pump enters alkaline solution by suction tube, liquid suction pipe and separating tube Into shower plate, shower nozzle uniformly sprays alkaline solution in spray chamber downwards, and the flue gas in baffling passage is sprayed, While alkaline solution and SO2Chemically reacted, by SO2Remove, shower water is fallen in fluid reservoir through precipitation recycling again by orifice plate Use.Because suction tube is located at the left side of fluid reservoir, therefore deflector is provided with the top of suction tube, made molten on the left of orifice plate Liquid to the right, is precipitated along deflector on the right side of fluid reservoir, suction tube is extracted the clean solution after precipitation filtering.Work as alkalescence The liquid level of solution is too high or too low to be made, and lower liquid level gauge and upper liquid level gauge send alarm, reminds workman to handle alkaline solution, Suction pumping is avoided less than being damaged after solution.When alkaline solution is reduced, mouth is added by alkaline solution and adds alkaline solution.
The concrete principle of flue gas plenum chamber and it is act as in the present invention：Main gas componant in flue gas after sulphur removal It is CO2, also containing unburned CO gases, CO gas phases compare CO2It is relatively light, naturally will be to floating in upper encloser by the 4th cigarette Feed channel is discharged in quick lime drier, thus can by flue gas can body be withdrawn into again in boiler repeat burn profit With, reduce energy resource consumption and reduce and pollute, heavier CO2Sink in lower encioser and discharged by delivery pipe；Flue gas exhalant level is set Put at the middle part of cylinder, and air dispelling hole is arranged on the bottom of flue gas exhalant, can so make flue gas equably downward in cylinder Heavy, lighter CO gases will reach good CO and CO to floating2Separating effect.
The concrete principle of cigarette oxygen mixed once device and it is act as in the present invention：The smoke inlet pipe of cigarette oxygen mixed once device leads to Enter the middle part into hybrid chamber, and uniformly spilt into by cigarette gas entering opening in hybrid chamber, two air intake ducts first by preceding dividing plate and The uniform gas distribution of empty gas entering opening on rear bulkhead, enters back into hybrid chamber and to be mixed with flue gas, mixed gas passes through right side Gaseous mixture steam vent on plate enters gather qi together and mixed in gas hood, because gather qi together mixes gas hood in left thick right thin conical structure, mixes Close when gas is moved from left to right in gather qi together cover because cross section is gradually reduced, mixed gas is further sufficiently mixed, It is sufficiently mixed uniform mixed gas and the discharge of gaseous mixture escape pipe is finally entered by gaseous mixture steam vent.Gather qi together mixes gas hood right-hand member Edge is fixedly connected with the outer wall of gaseous mixture escape pipe, so plays a part of strengthening blender escape pipe intensity.
Cigarette oxygen secondary mixer uses the principle of Venturi effect, under the premise of air blower offer is anticyclonic, gaseous mixture When body first passes through the flow section of jet pipe, there is flow velocity increase in fluid, when then the flow velocity of air-flow is by mixing exhalant, mistake Flow section gradually increases, and the principle that is inversely proportional according to flow velocity and flow section and knows that the increase of flow velocity is adjoint by Bernoulli's theorem The reduction of Fluid pressure, i.e., common Venturi effect, this effect refers to that low pressure can be produced near swiftly flowing fluid, So as to produce suction-operated at transition conduit, will again it be mixed in air adsorption to mixed gas, so that in mixed gas Oxygen concentration reach regulation requirement.
Due to carrying out sulphur removal operation using spray alkaline solution, so that contain more steam in flue gas, therefore, need Steam in flue gas is removed, the present invention is specific to be absorbed using quick lime ball to steam, and quick lime is absorbing moisture mistake Chemically reacted in journey, produce heat, flue gas can be heated, flue-gas temperature is raised, compensation is because of cigarette caused by spray The reduction of temperature degree.In addition, when quick lime ball adsorption moisture reaches saturation, sealing plate can be opened, by upper framework and underframe Extract out, change the quick lime ball in mesh bag, it is easy to operate.The top of drying box is in up-small and down-big rectangular pyramid structure, is dried The bottom of case is in up big and down small rectangular pyramid structure, and this structure can make flue gas when by quick lime ball, even gas distribution It is stronger.
Due to flue gas, air pressure can be reduced much after by quick lime drier, therefore be provided with the 5th flue Positioned at the booster fan of quick lime drier air outlet side, power is provided for cigarette oxygen mixed once.
In summary, the present invention solves the problems, such as the following aspects well, i.e., keep constant in the leading point of flue gas In the case of, the mixing point of flue gas is placed on the metastomium that goes out of air preheater, the hot blast and flue gas that then air preheater is come out It is collectively incorporated into a cigarette oxygen mixed once device, air blower is set in cigarette oxygen mixed once device exit, passes through air blower handle The mixed gas feeding road fluid bed and burner hearth Secondary Air of flue gas and hot-air, when the oxygen content in mixed gas is inadequate When, air can be introduced back into by cigarette oxygen secondary mixer.And carried out during supply, sulphur removal, CO recovery it is sharp again With, dry flue gas and the treatment process such as heat up.
The present invention it can be found that by reducing nitrogen by way of controlling oxygen when solving oil burning boiler in underload well The generation of oxide, while the use of flue gas recirculation being also to have the following advantages, first solves etching problem well：Due to The hot-air that air preheater comes out is general more than 120 DEG C, and flue-gas temperature is so mixed in cigarette oxygen mixed once device at 140 DEG C or so Temperature after conjunction is many higher than acid dew point, therefore air blower will not be corroded when entering air blower, due to entering air preheater It is air, air will not have acid corrosion to air preheater steel pipe, therefore thoroughly solve etching problem, reduce the dimension of boiler Repair, extend the run time of boiler, achieve good economic benefit；Second reduces power consumption：Due to flue gas not Air preheater through excessive backhaul, therefore the resistance of air preheater will not increase, relative reduces resistance, reduces power consumption, Achieve good economic benefit；3rd fuel is mixed evenly：After flue gas and air mixing, total air quantity simultaneously useless subtracts It is few, and ensure the content of oxygen in mixed gas, therefore it is fine in the mixing of burner hearth fuel, the utilization rate of oxygen is very high, no Only fuel combustion fully, and because fuel oxygen demand and oxygen-supplying amount match, almost unnecessary oxygen useless, such nitrogen oxides Discharge it is lower；4th present invention reduces the temperature and burner hearth of burner hearth when not increasing boiler volume or even reducing boiler volume The temperature of outlet, reduces the growing amount of boiler heating power type nitrogen oxides, facilitates the arrangement of superheater, reduces boiler overall Steel consumption.After above measure, the air demand that boiler is used to be atomized is not reduced, but boiler participates in the oxygen content reduction of burning , the generation of boiler nitrogen oxides is reduced by the measure for reducing oxygen supply of burning.
In summary by reducing fire box temperature and control burning two kinds of measures of oxygen-supplying amount, nitrogen oxygen of the boiler in fuel oil is made The discharge of compound, in the case where not using special denitrification apparatus, can also reach the discharge value of national requirements.
Brief description of the drawings
Fig. 1 is the front view of boiler body in the present invention；
Fig. 2 is Fig. 1 top view；
Fig. 3 is Fig. 1 left view；
Fig. 4 is the enlarged drawing of supercharging water injector in Fig. 3；
Fig. 5 is the mplifying structure schematic diagram of spiral finned tube in Fig. 2；
Fig. 6 is the profile of the fin of spiral finned tube in Fig. 5
Fig. 7 is the schematic flow sheet of fume treatment hybrid system in the present invention；
Fig. 8 is the structural representation of flue gas plenum chamber in Fig. 7；
Fig. 9 is the structural representation of cigarette oxygen mixed once device in Fig. 7；
Figure 10 is the structural representation of cigarette oxygen secondary mixer in Fig. 7；
Figure 11 is the structural representation of desulfurizing device in Fig. 7；
Figure 12 is the structural representation of quick lime drier in Fig. 7.
Embodiment
As shown in Fig. 1-Figure 12, the oil burning boiler for being substantially reduced nitrogen oxides generation of the invention, including boiler body 9, The inner right side of boiler body 9 is burner hearth 79, and the anterior right side opening of boiler body 9 is provided with burner mounting hole 80, burner mounting hole Boiler-burner 21 is installed, the surrounding inwall of burner hearth 79 is provided with water cooled membrane wall 81, and the left side of boiler body 9 is provided with 80 Drum 82 and lower drum 83, being connected by convection bank 84 between upper drum 82 and lower drum 83, burner hearth outlet flue 99 is set The rear portion of water cooled membrane wall 81 in left side, was provided between upper drum 82 and lower drum 83 and at burner hearth outlet flue 99 Hot device 85, the left side front portion of boiler body 9 is provided with the water cooled membrane wall 81 along the surrounding of burner hearth 79 in boiler nozzle 86, burner hearth 79 Some spiral finned tubes 87 are vertically evenly arranged with, the distance of spiral finned tube 87 and water cooled membrane wall 81 is more than water The water pipe caliber of cold membrane wall 81, the upper end of all spiral finned tubes 87 is extend into upper drum 82, all spiral fins The lower end of piece pipe 87 is extend into lower drum 83, and the length that spiral finned tube 87 is extend into upper drum 82 and lower drum 83 is not More than 10mm；When installing boiler, spiral finned tube 87 is assembled in place prior to water cooled membrane wall 81, spiral finned tube 87 and water cooling Membrane wall 81 carries out compound water cooling to burner hearth 79, makes the temperature control system of the cigarette of burner hearth outlet flue 99 below 950 °C；
Connected between boiler nozzle 86 and boiler-burner 21 by fume treatment hybrid system；Fume treatment hybrid system bag Include air preheater 1, flue gas plenum chamber 2, air plenum chamber 3, desulfurizing device 4, quick lime drier 5, cigarette oxygen mixed once device 6, drum Blower fan 7 and cigarette oxygen secondary mixer 8；
Boiler nozzle 86 is connected by the first flue 10 with the High Temperature Gas import of air preheater 1, the air outlet of air preheater 1 Mouth is connected by the first air duct 11 with the air inlet of air plenum chamber 3, and the low temperature gas outlet of air preheater 1 passes through the second flue gas Pipeline 12 is connected with the air inlet of desulfurizing device 4, and the gas outlet of desulfurizing device 4 passes through the 3rd flue 13 and flue gas plenum chamber 2 middle part connection, the top of flue gas plenum chamber 2 is connected by the 4th flue 14 with the air inlet of quick lime drier 5, raw The gas outlet of lime drier 5 is connected by the 5th flue 15 with the gas approach of cigarette oxygen mixed once device 6, static air pressure Case 3 is connected by the second air duct 16 with the air intlet of cigarette oxygen mixed once device 6, and cigarette oxygen mixed once device 6 passes through first Mixing duct 17 is connected with the air inlet of air blower 7, and the air outlet of air blower 7 is secondary mixed by the second mixing duct 18 and cigarette oxygen The combi inlet port connection of clutch 8, the air intlet of cigarette oxygen secondary mixer 8 passes through the 3rd air duct 19 and air plenum chamber 3 connections, the mixed gas outlet of cigarette oxygen secondary mixer 8 is connected with mixed gas air supply pipe 20, and mixed gas air supply pipe 20 goes out Mouth is connected with the air inlet lines of boiler-burner 21；
It is provided with 5th flue 15 on smoke regulating valve 23, the 3rd air duct 19 and is provided with air secondary mixing regulation It is provided with valve 24, the second mixing duct 18 on first oxygen content sensor 25, mixed gas air supply pipe 20 and is provided with mixing The oxygen content sensor 27 of gas control valve 26 and second, the second oxygen content sensor 27 is located at the He of mixed gas regulating valve 26 Between cigarette oxygen secondary mixer 8.
Flue gas plenum chamber 2 includes flue gas exhalant 28 and the cylinder 29 in rectangular parallelepiped structure, and the top and bottom of cylinder 29 are equal Opening, the top of cylinder 29 is provided with the wide upper encloser 30 in square taper under point, and it is upper wide in side that the bottom of cylinder 29 is provided with lower point The lower encioser 31 of taper, flue gas exhalant 28 is horizontally set on the middle part in cylinder 29, the gas outlet of flue gas exhalant 28 and cylinder The inwall of body 29 is fixedly connected and blocked, and the air inlet of flue gas exhalant 28 stretches out cylinder 29 and gone out with the 3rd flue 13 Gas port is connected, and bottom of the flue gas exhalant 28 in cylinder 29 uniformly offers air dispelling hole 32 along its length；Cylinder 29, upper cover The inwall of shell 30 and lower encioser 31 is coated with anticorrosion heat-insulation layer, and the bottom of lower encioser 31 is connected with delivery pipe 33, delivery pipe 33 On be provided with drain valve 34.By adjusting the aperture of drain valve 34, the standing degree of flue gas in flue gas plenum chamber 2 can be adjusted.
Cigarette oxygen mixed once device 6 includes gas mixed box, gather qi together and mixes gas hood 36, smoke inlet pipe 37, two air inlets Pipe 38 and a gaseous mixture escape pipe 39, gas mixed box by upper boxboard, lower boxboard, left boxboard 40, right boxboard 41, preceding boxboard 42 and after Boxboard 43 is encircled into rectangular shape, and smoke inlet pipe 37 and gaseous mixture escape pipe 39 are horizontally disposed with left-right direction, gather qi together The center line of mixed gas hood 36, smoke inlet pipe 37 and gaseous mixture escape pipe 39 is overlapped, and the left end of smoke inlet pipe 37 stretches out left case The middle part of plate 40 is simultaneously connected with the gas outlet of the 5th flue 15, and the right-hand member of smoke inlet pipe 37 is fixed with the right left side wall of boxboard 41 And be tightly connected, the gas outlet of two air intake ducts is connected with the preceding middle part of boxboard 42 and the middle part of rearing-box plate 43 respectively, two skies Gas outlet of the air inlet of gas air inlet pipe 39 with the second air duct 16 is connected, be provided with gas mixed box by inside gas mixed box by The preceding dividing plate 47 and rear bulkhead 48 of ante-chamber 44, hybrid chamber 45 and back cavity 46 are divided into after forward direction successively, preceding dividing plate 47 is located at flue gas The front side of air inlet pipe 37, rear bulkhead 48 is located at the rear side of smoke inlet pipe 37, the left end of gaseous mixture escape pipe 39 and right boxboard 41 Right side wall is fixed and is tightly connected, and gather qi together mixes the profile of gas hood 36 in left thick right thin conical structure, and gather qi together mixes gas hood 36 Left side is fixedly connected with left boxboard 40, and the outer wall at right-hand member edge and gaseous mixture escape pipe 39 that gather qi together mixes gas hood 36, which is fixed, to be connected Connect；
Several cigarette gas entering openings 49 in gas mixed box, preceding dividing plate 47 are along the circumferential direction uniformly offered on smoke inlet pipe 37 Several are offered on several sky gas entering openings 50, right plate by hybrid chamber 45 and the mixed gas of gather qi together with being offered on rear bulkhead 48 The mixing inside the mixed gas hood 36 of gather qi together is offered on the gaseous mixture venthole 51 of the inside of cover 36 connection, gaseous mixture escape pipe 39 Gas steam vent 52, the gas outlet of gaseous mixture escape pipe 39 is connected with the air inlet of the first mixing duct 17.
Cigarette oxygen secondary mixer 8 includes air jet pipe 53, transition conduit 54, jet pipe 55 and the mixing exhalant of coaxial setting 56, the air inlet of air jet pipe 53 is connected with the gas outlet of the second mixing duct 18, gas outlet and the jet pipe 55 of air jet pipe 53 Air inlet is connected, and the gas outlet of jet pipe 55 is connected with the air inlet of transition conduit 54, and the gas outlet of transition conduit 54 is with mixing diverging The air inlet connection of pipe 56, the gas outlet of mixing exhalant 56 is connected with the air inlet of mixed gas air supply pipe 20, jet pipe 55 It is more than the circular cone barrel structure of gas outlet in air inlet, jet pipe 55 is more than the circular cone barrel structure of air inlet, transitional cylinder in gas outlet On be connected with drainage tube, the inlet end of drainage tube is adjacent to the side of jet pipe 55, the air inlet of drainage tube and the 3rd air duct 19 Gas outlet connection.
Desulfurizing device 4 includes being horizontally disposed with sulphur removal case 58, suction pump 59, liquid suction pipe 60 and shower plate 61, sulphur removal case 58 There is the orifice plate 62 by top spray chamber and the fluid reservoir of bottom is divided into inside sulphur removal case 58, shower plate 61 is hollow structure, spray Drench plate 61 and be horizontally set on the top inner wall of sulphur removal case 58, shower plate 61 is hollow structure, and the lower surface of shower plate 61 is evenly arranged with Several shower nozzles 63, the lower surface of shower plate 61 has been arranged in vertical at least three pieces overhead gages 64, and the upper surface of orifice plate 62 is along hanging down Nogata to being provided with least three pieces lower baffle plates 65, the front side and rear side of overhead gage 64 and lower baffle plate 65 respectively with before sulphur removal case 58 Side inwall is fixedly connected with rear side inwall, and overhead gage 64 is set with the uniform intervals of lower baffle plate 65, between overhead gage 64 and orifice plate 62, It is respectively provided with gap between lower baffle plate 65 and shower plate 61, the left side and right side of sulphur removal case 58 go out with the second flue 12 respectively The air inlet connection of gas port and the 3rd flue 13；
Alkaline solution is loaded with the fluid reservoir of sulphur removal case 58, suction pump 59 is located at the left side of sulphur removal case 58, the import of suction pump 59 The suction tube 66 for extending into alkaline solution top is connected with, the outlet of suction pump 59 is connected with the import of liquid suction pipe 60, liquid suction pipe The 60 upper parallel top for being arranged on sulphur removal case 58, liquid suction pipe 60 is connected by some separating tubes with the inside of shower plate 61；
It is provided with the fluid reservoir of sulphur removal case 58 positioned at the lower liquid level gauge 69 on the top of suction tube 66 and positioned at the lower surface of orifice plate 62 Upper liquid level gauge 67, the lower right side of sulphur removal case 58 offer alkaline solution addition mouth 68, alkaline solution addition mouth 68 at be provided with it is stifled Plate；
Deflector 70 is provided with the fluid reservoir of sulphur removal case 58, deflector 70 is located at the top of suction tube 66 and deflector 70 is in left height Right low dip is set, the edge in the left side of deflector 70, front side and rear side respectively with the left side of sulphur removal case 58, front side and rear side Wall is fixedly connected.
Quick lime drier 5 includes drying box 71, and the top of drying box 71 is in up-small and down-big rectangular pyramid structure, is dried The bottom of case 71 is in that left and right horizontal direction is provided with the He of upper strata track 72 in up big and down small rectangular pyramid structure, drying box 71 Slide to be provided with framework 74 and underframe 75, upper framework 74 and underframe 75 in lower floor's track 73, upper strata track 72 and lead to Mesh bag is crossed equipped with quick lime ball 76, the right side opening of drying box 71, which is provided with, is used for opening for framework 74 and underframe 75 on horizontal pulling Mouthful, it is provided with sealing plate 77 at opening.
The booster fan 78 positioned at the air outlet side of quick lime drier 5 is provided with 5th flue 15.
Spiral finned tube 87 is made up of helix fin tube body 88 and fin 89, and helix fin tube body 88 and fin 89 are adopted It is integrally formed with a kind of metal material by hot rolling technology, and passes through the spiral finned tube of multiple roll-in formation uniform pitch 87, the section of fin 89 in echelon, fin 89 helix fin tube body 88 axial direction into spiral yarn shaped.
Also include being used to strengthen the supercharging water injector 90 of cooling water circulation flowing velocity in spiral finned tube 87；
Being pressurized water injector 90 includes the first mounting bracket 91, the second mounting bracket 92, two feed pumps 93 and two feed pipes 94, the One mounting bracket 91 and the second mounting bracket 92 are arranged at the inner bottom part of lower drum 83, two feed pipes 94 edge and the center of lower drum 83 The parallel direction of line is extend into lower drum 83 by the rear end of lower drum 83, and two feed pipes 94 pass through U-bolt 95, pad and spiral shell Mother 100 is separately mounted on the first mounting bracket 91 and the second mounting bracket 92, the front end closure of feed pipe 94, every feed pipe 94 Rear end correspond to and be connected with the delivery port of a feed pump 93, one is respectively arranged with two feed pipes 94 positioned at boiler sheet Connected between control valve 96 outside body 9, two feed pipes 94 by some connecting tubes 97, wherein on a feed pipe 94 It is connected with some playpipes 98 along its length, the jet and a lower port pair of spiral finned tube 87 of every playpipe 98 Should, the distance between jet of playpipe 98 and the lower port of spiral finned tube 87 are 2-4mm, the jet of playpipe 98 it is interior Footpath is 3-5mm.
Spiral finned tube 87 using from burner mounting hole 80 to the direction of burner hearth outlet flue 99 gradually from sparse to dense again to Thin arrangement, the water pipe of spiral finned tube 87 and water cooled membrane wall 81 is interval-staggered.
The present invention reduces the generation of nitrogen oxides using two kinds of measures：First, reduce the internal temperature of burner hearth 79；Second uses Oxygen content after the flue gas of discharge is mixed with air in reduction air, is supplied to the interior circulation of burner hearth 79.
The first measure is that the concrete principle and technical measures for reducing the ignition temperature of burner hearth 79 are：
Inside the surrounding water cooled membrane wall 81 of burner hearth 79 of oil burning boiler, arrangement installs water cooling tube in bulk, equivalent to original Burner hearth 79 on the basis of add a water-cooled furnace 79, in order to make full use of the space that burner hearth 79 is limited, the water cooling tube of arrangement Using spiral finned tube 87, spiral finned tube 87 is formed using overall hot rolling, increases the endotherm area of fire side, for not shadow The heat absorption of water cooled membrane wall 81 is rung, the outer of spiral finned tube 87 of arrangement is at least more than the water pipe of a membrane wall apart from membrane wall Caliber, and the water pipe of spiral finned tube 87 and water cooled membrane wall 81 is interval-staggered, the quantity of spiral finned tube 87 with Temperature in burner hearth 79 is reduced to less than 950 DEG C to be advisable, such temperature can be very good to control the generation of nitrogen oxides, together When again can burner hearth outlet flue 99 arrange superheater 85, it is to avoid because the thermic load of superheater 85 is too big, superheated steam heat absorption energy Power difference and cause booster, due to sufficiently make use of the space of radiation heat transfer in burner hearth 79, can be increased without burner hearth 79 and The volume of boiler, when maintaining same exhaust gas temperature, it is possible to reduce convection bank 84 between upper drum 82 and lower drum 83 Arrangement, reduces the steel consumption of boiler and the overall weight and volume of boiler.
The specific increase boiler extension method of water-cooled furnace 79 is as follows：In the water cooled membrane wall 81 of the surrounding of burner hearth 79, against water The place of cold membrane wall 81, increases water cooling tube, forms internal separate tube burner hearth 79, and the original composition Compound Water of water cooled membrane wall 81 The burner hearth 79 of air-cooled structure, internal water cooling tube can be light pipe or the pipe of fin 89 composition, and the present invention is preferential to use globality spiral Extended surface tube 87, such a spiral finned tube 87 forms spiral finned tube 87, spiral by hot rolling technology, and by multiple roll-in Fin tube body 88 and fin 89 are integrally formed, without welding therefore material between fin 89 and helix fin tube body 88 It is identical, the section of fin 89 in echelon, fin 89 helix fin tube body 88 axial direction into spiral yarn shaped, such a structure profit The disturbance when diffusion of heat and flue gas are conducted heat, therefore the heat transfer coefficient of spiral finned tube 87 is very high, unit length heat-transfer area Product is big, and the increase heating surface of the less quantity of helix fin tube body 88 but at double can be arranged in limited space Product.Because oil burning boiler is, with upper drum 82 and the arrangement of lower drum 83, directly spiral finned tube 87 can be through In the middle of drum 82 and lower drum 83, using plug in construction, the upper and lower end of upper drum 82 and lower drum 83 penetrates pot Barrel is deep into inside drum, can so ensure that upper drum 82 and the two ends of lower drum 83 are buried in water in boiler operatiopn, Ensure the safety heat exchange of upper drum 82 and lower drum 83 when carrying out radiation heat transfer, spiral finned tube 87 is inside drum using envelope Mode and the drum connection of welding are closed, the length that spiral finned tube 87 is stretched into inside drum should be not more than 10mm and be advisable, in burner hearth The outer of spiral finned tube 87 of 79 inside arrangements is at least more than the caliber of the water pipe of a membrane wall, spiral shell apart from the membrane wall of burner hearth 79 The quantity of rotation extended surface tube 87 is advisable so that the temperature in boiler furnace 79 is reduced to less than 950 degree（This temperature on the one hand can be with Radiation heat transfer is met, the generation of oxynitrides can be reduced again）, while should meet more than the intensity requirement of boiler drum, satisfaction After two kinds require, the spiral finned tubes 87 of internal layer burner hearths 79 should be arranged as far as possible more, in order to not influence the ignition temperature of fuel, The arrangement quantity of spiral finned tube 87 should be suitably reduced near burner mounting hole 80, the inner side of water cooled membrane wall 81 is being installed During spiral finned tube 87, it should be assembled in place prior to water cooled membrane wall 81.
Because the heat transfer in burner hearth 79 belongs to radiant heat transfer, calorific intensity is big, in order to increase the security of water circulation, in internal layer Arrangement supercharging water injector 90, sets control valve 96 on feed pipe 94 at the lower port of spiral finned tube 87 of burner hearth 79, this Control valve 96 keeps standard-sized sheet, the how many size Controls by water jet of resistance of water spray, in boiler shutdown in the process of running Control valve 96 is closed, playpipe 98, jet and the lower end of spiral finned tube 87 of playpipe 98 are set on feed pipe 94 Mouth correspondence, the jet of playpipe 98 is maintained at 3mm or so preferably apart from the lower port of spiral finned tube 87, the injection of playpipe 98 Mouth size is generally kept in 3-5mm preferably, the water under high pressure for allowing the jet of playpipe 98 to gush out（The meter per second of flow velocity about 5）, to spiral shell The Water circulation hydrodynamics deficiency that rotation extended surface tube 87 is likely to occur provides compensation, it is ensured that the high reliability of the water circulation of spiral finned tube 87, So as to the temperature being easier in reduction burner hearth 79.In addition, two feed pumps 93 and two feed pipes 94 are used in the present invention, and Connected between two feed pipes 94 by some connecting tubes 97, so can not only greatly enhance the stream that playpipe 98 sprays water Speed, and when a feed pump 93 breaks down or overhauled, another can also continue to work, so that the operation of pressurized water Uninterrupted progress, it is ensured that big fluctuation does not occur for the temperature in burner hearth 79.
After compound water-cooled furnace 79, if boiler carries superheater 85, superheater 85 can be directly arranged at stove Thorax 79 is exported, and without exporting first arrangement convection bank 84 in burner hearth 79 by original arrangement, superheater 85 is then arranged again, The installation and inspection of superheater 85 are facilitated, can be with less arrangement convection bank for same boiler export flue-gas temperature 84, the volume of boiler is reduced, the overall steel consumption of boiler is reduced, the overall performance of boiler is not reduced.
Second of measure is the concrete measure that discharged nitrous oxides are reduced by reducing the method for boiler combustion oxygen content, i.e., Into boiler-burner 21, the specific supply flow of the relatively low air of required oxygen content is：The height produced in boiler body 9 The air heat exchange that warm flue gas is preheated by the first flue 10 into 1 pair of air preheater by air preheater 1, heat exchange Flue gas is entered by the second flue 12 to be sprayed and sulphur removal in desulfurizing device 4, and then flue gas is entered in plenum chamber, greatly Partial flue gas is discharged by the delivery pipe 33 of the bottom of lower encioser 31, and can adjust mass rate of emission, a small amount of cigarette by drain valve 34 Gas is entered by the 4th flue 14 and the steam in flue gas is adsorbed in quick lime drier 5, dried flue gas Entered by the 5th flue 15 in the smoke inlet pipe 37 in cigarette oxygen mixed once device 6；Air preheat simultaneously after enters Into air plenum chamber 3, most air enters cigarette oxygen once by the second air duct 16 and two air intake ducts 38 In blender 6, flue gas and air are carried out after uniformly mixing by air blower 7 through the second mixing duct in cigarette oxygen mixed once device 6 18 mixed gas are sent in cigarette oxygen secondary mixer 8, when the first oxygen content sensor 25 detects the oxygen-containing of mixed gas When measuring less, air secondary mixing regulating valve 24 is opened, it is secondary that air enters cigarette oxygen by the 3rd air duct 19 and drainage tube Mixed again in blender 8, detect that the oxygen content in mixed gas reaches that regulation will through the second oxygen content sensor 27 After asking, fixed air secondary mixes the aperture of regulating valve 24；Qualified mixed gas is last from mixed gas air supply pipe 20 to pot The anterior burner supply of burner hearth 79 of furnace body 9.Single arrow is air flow in Fig. 1, and double arrow is flue gas flow direction, three rows Arrow flows to for mixed gas.
The principle of desulfurizing device 4 and it act as：Because the flue gas discharged in boiler body 9 contains many SO2, the present invention By the way of spray sulphur removal, flue gas is entered by the left side of sulphur removal case 58, sequentially passes through shape between overhead gage 64 and lower baffle plate 65 Discharged after into baffling passage by the right side of sulphur removal case 58, at the same time, alkaline solution is passed through suction tube 66, drawing liquid by suction pump 59 Pipe 60 and separating tube are entered in shower plate 61, and shower nozzle 63 uniformly sprays alkaline solution in spray chamber downwards, in baffling Flue gas in passage is sprayed, while alkaline solution and SO2Chemically reacted, in the lump by SO2Remove, shower water is by orifice plate 62 fall on again it is recycled through precipitating in fluid reservoir.Because suction tube 66 is located at the left side of fluid reservoir, therefore in suction tube 66 Top be provided with deflector 70, make the solution containing impurity in the left side of orifice plate 62 along deflector 70 to the right, on the right side of fluid reservoir Precipitation, can so make suction tube 66 extract the clean solution after precipitation filtering, it is to avoid to block shower nozzle 63.When the liquid level of alkaline solution When too high or too low, lower liquid level gauge 69 and upper liquid level gauge 67 send alarm, remind workman to handle alkaline solution, it is to avoid to take out Sucking pump 59 is taken out to be damaged less than after solution.When alkaline solution is reduced, mouth is added by alkaline solution and adds alkaline solution.
The concrete principle of flue gas plenum chamber 2 and it is act as in the present invention：In flue gas after sulphur removal main gas into It is CO to divide2, also containing unburned CO gases, CO gas phases compare CO2It is relatively light, naturally will be to floating in upper encloser 30 by the Four flues 14 are discharged in quick lime drier 5, thus can by flue gas can body be withdrawn into burner hearth 79 weight again Resume combustion, which is burnt, to be utilized, and is reduced energy resource consumption and is reduced pollution, heavier CO2Sink in lower encioser 31 and discharged by delivery pipe 33；Flue gas Exhalant 28 is horizontally set on the middle part of cylinder 29, and air dispelling hole 32 is arranged on the bottom of flue gas exhalant 28, can so make cigarette Gas is equably to sinking in cylinder 29, and lighter CO gases will reach good CO and CO to floating2Separating effect.
The concrete principle of cigarette oxygen mixed once device 6 and it is act as in the present invention：The smoke inlet pipe of cigarette oxygen mixed once device 6 37 are passed into the middle part in hybrid chamber 45, and are uniformly spilt into by cigarette gas entering opening 49 in hybrid chamber 45, two air intake ducts 38 First the uniform gas distribution of the empty gas entering opening 50 on preceding dividing plate 47 and rear bulkhead 48, enters back into and is mixed in hybrid chamber 45 with flue gas, Mixed gas enters gather qi together by the gaseous mixture steam vent 52 on right plate and mixed in gas hood 36, because gather qi together mixes gas hood 36 In left thick right thin conical structure, because cross section is gradually reduced when mixed gas is moved from left to right in gather qi together cover, mix Close gas to be further sufficiently mixed, be sufficiently mixed uniform mixed gas and mixing is finally entered by gaseous mixture steam vent 52 Gas escape pipe 39 is discharged.Gather qi together mixes the right-hand member edge of gas hood 36 and is fixedly connected with the outer wall of gaseous mixture escape pipe 39, so plays and adds The effect of strong blender escape pipe intensity.
Cigarette oxygen secondary mixer 8 using Venturi effect principle, air blower 7 provide it is anticyclonic under the premise of, mixing When gas first passes through the flow section of jet pipe 55, there is flow velocity increase in fluid, and then the flow velocity of air-flow is by mixing exhalant When 56, flow section gradually increases, and the principle that is inversely proportional according to flow velocity and flow section and knows flow velocity by Bernoulli's theorem The reduction of the adjoint Fluid pressure of increase, i.e., common Venturi effect, this effect refers to the meeting near swiftly flowing fluid Low pressure is produced, so as to produce suction-operated at transition conduit 54, will again be mixed in air adsorption to mixed gas, so that Oxygen concentration in mixed gas reaches regulation requirement.
Due to carrying out sulphur removal operation using spray alkaline solution, so that contain more steam in flue gas, therefore, need Steam in flue gas is removed, the present invention is specific to be absorbed using quick lime ball 76 to steam, and quick lime is absorbing moisture During chemically react, produce heat, flue gas can be heated, flue-gas temperature is raised, compensation because spray caused by The reduction of flue-gas temperature.In addition, when the adsorption moisture of quick lime ball 76 reaches saturation, sealing plate 77 can be opened, by upper framework 74 Extracted out with underframe 75, change the quick lime ball 76 in mesh bag, it is easy to operate.The top of drying box 71 is in four up-small and down-big ribs Tapered structure, the bottom of drying box 71 is in up big and down small rectangular pyramid structure, and this structure can make flue gas by quick lime During ball 76, even gas distribution is stronger.
Due to flue gas, air pressure can be reduced much after by quick lime drier 5, therefore be set on the 5th flue 15 The booster fan 78 positioned at the air outlet side of quick lime drier 5 is equipped with, power is provided for cigarette oxygen mixed once.
The present embodiment not makees any formal limitation to shape, material, structure of the present invention etc., every according to this hair Any simple modification, equivalent variations and modification that bright technical spirit is made to above example, belong to the technology of the present invention side The protection domain of case.

Claims (10)

1. the oil burning boiler of nitrogen oxides generation is substantially reduced, including boiler body, boiler body inner right side is burner hearth, boiler Body portion right side opening is provided with burner mounting hole, burner mounting hole and is provided with boiler-burner, and burner hearth surrounding inwall is set It is equipped with the left of water cooled membrane wall, boiler body and is provided with upper drum and lower drum, convection current is passed through between upper drum and lower drum Tube bank connection, burner hearth outlet flue is arranged on the water cooled membrane wall rear portion in left side, between upper drum and lower drum and positioned at burner hearth Front portion on the left of superheater, boiler body is provided with outlet flue and is provided with boiler nozzle, it is characterised in that：The water of burner hearth surrounding Some spiral finned tubes are evenly arranged with the inside of cold membrane wall, water cooled membrane wall is encircled into outer burner hearth, these spiral finned tubes It is encircled into internal furnace, water cooled membrane wall and spiral finned tube exist in freeze profile into compound water-cooled furnace, every spiral finned tube Vertical direction is arranged between upper drum and lower drum, and the distance between spiral finned tube and water cooled membrane wall is more than water cooled membrane wall Water pipe caliber, the upper end of all spiral finned tubes is extend into upper drum, and the lower end of all spiral finned tubes is stretched into Into lower drum, the length that spiral finned tube is extend into upper drum and lower drum no more than 10mm；When installing boiler, spiral Extended surface tube is assembled in place prior to water cooled membrane wall, and spiral finned tube carries out compound water cooling to burner hearth with water cooled membrane wall, makes burner hearth The fibre selection of outlet flue is below 950 °C；
Connected between boiler nozzle and boiler-burner by fume treatment hybrid system；Fume treatment hybrid system includes sky Pre- device, flue gas plenum chamber, air plenum chamber, desulfurizing device, quick lime drier, cigarette oxygen mixed once device, air blower and cigarette oxygen Secondary mixer；
Boiler nozzle is connected by the High Temperature Gas import of the first flue and air preheater, and the air outlet of air preheater passes through The air inlet connection of first air duct and air plenum chamber, the low temperature gas outlet of air preheater passes through the second flue and sulphur removal The air inlet connection of device, the gas outlet of desulfurizing device is connected by the 3rd flue with the middle part of flue gas plenum chamber, flue gas The top of plenum chamber is connected by the 4th flue with the air inlet of quick lime drier, and the gas outlet of quick lime drier leads to The gas approach that the 5th flue is crossed with cigarette oxygen mixed once device is connected, and air plenum chamber passes through the second air duct and cigarette oxygen The air intlet connection of mixed once device, cigarette oxygen mixed once device is connected by the air inlet of the first mixing duct and air blower, The air outlet of air blower is connected by the second mixing duct with the combi inlet port of cigarette oxygen secondary mixer, cigarette oxygen secondary mixer Air intlet be connected by the 3rd air duct with air plenum chamber, the mixed gas outlet of cigarette oxygen secondary mixer is connected with mixed Gas air supply pipe is closed, the outlet of mixed gas air supply pipe and the air inlet lines of burner are connected；
It is provided with 5th flue on smoke regulating valve, the 3rd air duct and is provided with air secondary mixing regulating valve, the It is provided with two mixing ducts on the first oxygen content sensor, mixed gas air supply pipe and is provided with mixed gas regulating valve and Two oxygen content sensors, the second oxygen content sensor is located between mixed gas regulating valve and cigarette oxygen secondary mixer.
2. the oil burning boiler according to claim 1 for being substantially reduced nitrogen oxides generation, it is characterised in that：Flue gas plenum chamber Including flue gas exhalant and the cylinder in rectangular parallelepiped structure, cylinder top and bottom are open, are provided with the top of cylinder under point The wide upper encloser in square taper, cylinder body bottom is provided with lower encioser of the upper width of lower point in square taper, and flue gas exhalant is horizontally disposed with Middle part in cylinder, the gas outlet of flue gas exhalant is fixedly connected and blocked with cylinder inboard wall, the air inlet of flue gas exhalant Mouth stretches out cylinder and is connected with the gas outlet of the 3rd flue, and bottom of the flue gas exhalant in cylinder is uniform along its length Offer air dispelling hole；The inwall of cylinder, upper encloser and lower encioser is coated with the top of anticorrosion heat-insulation layer, upper encloser and the 4th cigarette The import connection of feed channel, lower encioser bottom is connected with delivery pipe, delivery pipe and is provided with drain valve.
3. the oil burning boiler according to claim 1 for being substantially reduced nitrogen oxides generation, it is characterised in that：Cigarette oxygen is once mixed Clutch includes gas mixed box, gather qi together and mixes gas hood, a smoke inlet pipe, two air intake ducts and a gaseous mixture escape pipe, mixes Gas tank is encircled into rectangular shape by upper boxboard, lower boxboard, left boxboard, right boxboard, preceding boxboard and rearing-box plate, smoke inlet pipe and Gaseous mixture escape pipe is horizontally disposed with left-right direction, and gather qi together mixes the center line of gas hood, smoke inlet pipe and gaseous mixture escape pipe Overlap, the left end of smoke inlet pipe stretches out in the middle part of left boxboard and is connected with the gas outlet of the 5th flue, smoke inlet pipe Right-hand member is fixed and is tightly connected with right boxboard left side wall, the gas outlets of two air intake ducts respectively with the middle part of preceding boxboard and rear cabinet Connect in the middle part of plate, the gas outlet of the air inlets of two air intake ducts with the second air duct is connected, and is provided with gas mixed box The preceding dividing plate and rear bulkhead of ante-chamber, hybrid chamber and back cavity will be divided into inside gas mixed box successively from the front to the back, preceding dividing plate is located at cigarette The front side of gas air inlet pipe, rear bulkhead is located at the rear side of smoke inlet pipe, and the left end of gaseous mixture escape pipe is consolidated with right boxboard right side wall Determine and be tightly connected, gather qi together mixes the profile of gas hood in left thick right thin conical structure, and gather qi together mixes the left side and left case of gas hood Plate is fixedly connected, and the right-hand member edge that gather qi together mixes gas hood is fixedly connected with the outer wall of gaseous mixture escape pipe；
Along the circumferential direction uniformly offer several cigarette gas entering openings in gas mixed box on smoke inlet pipe, preceding dividing plate and after every Offered on plate and offer what several connected hybrid chamber and the mixed gas hood inside of gather qi together on several sky gas entering openings, right plate The gaseous mixture steam vent inside the mixed gas hood of gather qi together, gaseous mixture outlet are offered on gaseous mixture venthole, gaseous mixture escape pipe The gas outlet of pipe is connected with the air inlet of the first mixing duct.
4. the oil burning boiler according to claim 1 for being substantially reduced nitrogen oxides generation, it is characterised in that：Cigarette oxygen is secondary mixed Clutch includes air jet pipe, transition conduit, jet pipe and the mixing exhalant of coaxial setting, and the air inlet of air jet pipe is mixed with second The air inlet of the gas outlet connection of pipeline, the gas outlet of air jet pipe and jet pipe is connected, the gas outlet of jet pipe and transition conduit Air inlet is connected, and the gas outlet of transition conduit is connected with mixing the air inlet of exhalant, mixes gas outlet and the gaseous mixture of exhalant The air inlet connection of body air supply pipe, jet pipe is more than the circular cone barrel structure of gas outlet in air inlet, and jet pipe is more than in gas outlet Drainage tube is connected with the circular cone barrel structure of air inlet, transitional cylinder, the inlet end of drainage tube adjacent to jet pipe side, drainage tube Air inlet is connected with the gas outlet of the 3rd air duct.
5. the oil burning boiler according to claim 1 for being substantially reduced nitrogen oxides generation, it is characterised in that：Desulfurizing device bag Including to be horizontally disposed with sulphur removal case, suction pump, liquid suction pipe and shower plate, sulphur removal case has and top spray chamber will be divided into inside sulphur removal case With the orifice plate of the fluid reservoir of bottom, shower plate is hollow structure, and shower plate is horizontally set on sulphur removal box top inwall, and shower plate is Hollow structure, shower plate lower surface is evenly arranged with several shower nozzles, and shower plate lower surface has been arranged in vertical at least three Block overhead gage, orifice plate upper surface has been arranged in vertical at least three pieces lower baffle plates, the front side and rear side of overhead gage and lower baffle plate Be fixedly connected respectively with the front inner wall and rear side inwall of sulphur removal case, overhead gage and lower baffle plate uniform intervals are set, overhead gage with Be respectively provided with gap between orifice plate, between lower baffle plate and shower plate, the left side and right side of sulphur removal case respectively with the second flue The air inlet connection of gas outlet and the 3rd flue；
Alkaline solution is loaded with the fluid reservoir of sulphur removal case, suction pump is located on the left of sulphur removal case, and the import of suction pump, which is connected with, stretches Enter the suction tube to alkaline solution top, the outlet of suction pump and the import of liquid suction pipe are connected, the upper parallel setting of liquid suction pipe At the top of sulphur removal case, liquid suction pipe is connected by some separating tubes with the inside of shower plate；
The lower liquid level gauge positioned at suction tube top and the upper liquid level gauge positioned at orifice plate lower surface are provided with the fluid reservoir of sulphur removal case, Sulphur removal case lower right side offers and is provided with closure plate at alkaline solution addition mouth, alkaline solution addition mouth；
Deflector is provided with the fluid reservoir of sulphur removal case, deflector is located above suction tube and deflector is tilted in right low left high and set Put, the edge in the left side of deflector, front side and rear side respectively with the left of sulphur removal case, the inwall of front side and rear side is fixedly connected.
6. the oil burning boiler according to claim 1 for being substantially reduced nitrogen oxides generation, it is characterised in that：Quick lime is dried Device includes drying box, and the top of drying box is in up-small and down-big rectangular pyramid structure, and the bottom of drying box is in up big and down small four Left and right horizontal direction is provided with upper strata track and lower floor's track in pyramid type structure, drying box, upper strata gliding in tracks is set Have in upper framework and underframe, upper framework and underframe and quick lime ball is equipped with by mesh bag, the right side opening of drying box is provided with use Sealing plate is provided with the opening of framework on horizontal pulling and underframe, opening.
7. the oil burning boiler according to claim 1 for being substantially reduced nitrogen oxides generation, it is characterised in that：5th fume pipe The booster fan positioned at quick lime drier air outlet side is provided with road.
8. spiral finned tube is made up of helix fin tube body and fin, helix fin tube body and fin use a kind of metal material Material is integrally formed by hot rolling technology, and by the spiral finned tube of multiple roll-in formation uniform pitch, fin section is into ladder Shape, fin helix fin tube body axial direction into spiral yarn shaped.
9. the oil burning boiler according to claim 1 for being substantially reduced nitrogen oxides generation, it is characterised in that：Also include being used for Strengthen the supercharging water injector of cooling water circulation flowing velocity in spiral finned tube；
Be pressurized water injector include the first mounting bracket, the second mounting bracket, two feed pumps and two feed pipes, the first mounting bracket and Second mounting bracket is arranged at lower drum inner bottom part, and two feed pipes are along the direction with lower drum centerline parallel by lower drum Rear end is extend into lower drum, and two feed pipes are separately mounted on the first mounting bracket and by U-bolt, pad and nut On two mounting brackets, the front end closure of feed pipe, the rear end of every feed pipe is corresponded to be connected with the delivery port of a feed pump, and two It is respectively arranged with root feed pipe between a control valve being located at outside boiler body, two feed pipes and passes through some companies Adapter connection, wherein some playpipes are connected with a feed pipe along its length, the jet and one of every playpipe Root helix fin infratubal port is corresponding, and the distance between jet and helix fin infratubal port of playpipe are 2-4mm, injection The internal diameter of the jet of pipe is 3-5mm.
10. the oil burning boiler according to claim 1 for being substantially reduced nitrogen oxides generation, it is characterised in that：Helix fin Pipe is used from burner mounting hole to the direction of burner hearth outlet flue gradually from sparse to dense again to thin arrangement, spiral finned tube Water pipe with water cooled membrane wall is interval-staggered.
CN201710453879.9A 2017-06-15 2017-06-15 Oil-fired boiler capable of sufficiently reducing nitrogen oxide Active CN107120631B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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US20100101462A1 (en) * 2008-10-27 2010-04-29 Hitachi, Ltd. Oxyfuel Boiler and a Method of Controlling the Same
CN203203010U (en) * 2013-04-28 2013-09-18 大唐时代节能科技有限公司 Boiler for yellow phosphorus tail gas combustion
CN204534554U (en) * 2015-03-24 2015-08-05 湖南正明环境工程有限公司 Rotate burnt wind low nitrogen burning denitrating system
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