CN107120631B - Oil-fired boiler capable of sufficiently reducing nitrogen oxide - Google Patents

Oil-fired boiler capable of sufficiently reducing nitrogen oxide Download PDF

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Publication number
CN107120631B
CN107120631B CN201710453879.9A CN201710453879A CN107120631B CN 107120631 B CN107120631 B CN 107120631B CN 201710453879 A CN201710453879 A CN 201710453879A CN 107120631 B CN107120631 B CN 107120631B
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China
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boiler
pipe
smoke
gas
air
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CN201710453879.9A
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Chinese (zh)
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CN107120631A (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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Henan Enthalpy New Material Co ltd
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    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)

Abstract

The fuel oil boiler capable of fully reducing the generation of nitrogen oxides comprises a boiler body, wherein a hearth is arranged on the right side in the boiler body, a boiler burner extending into the hearth is arranged at the front part of the boiler body, a plurality of spiral fin pipes are uniformly arranged on the inner sides of water-cooling membrane type walls around the hearth, the water-cooling membrane type walls and the spiral fin pipes form a composite water-cooling hearth in the hearth, and the upper end and the lower end of each spiral fin pipe respectively extend into an upper boiler barrel and a lower boiler barrel; the boiler smoke outlet is connected with the boiler burner through a smoke treatment mixing system; the flue gas treatment mixing system comprises an air preheater, a flue gas static pressure box, an air static pressure box, a sulfur removal device, a quick lime dryer, a smoke and oxygen primary mixer, a blower and a smoke and oxygen secondary mixer. The invention can reduce the temperature of the furnace chamber and control the combustion oxygen supply amount, so that the emission of the nitrogen oxide of the boiler during the fuel oil combustion can reach the emission value required by the state under the condition of not adopting a special denitration device.

Description

Oil-fired boiler capable of sufficiently reducing nitrogen oxide
Technical Field
The invention belongs to the technical field of boilers, and particularly relates to an oil-fired boiler capable of sufficiently reducing nitrogen oxides.
Background
For a long time, coal is always used as a main energy source in China, a coal-fired boiler is used in a large amount, coal smoke type air pollution is formed, and particularly in haze weather which frequently occurs in recent years, the energy policy and the energy structure of China are further promoted to be transformed as soon as possible. At present, the coal-fired industry and domestic boiler in China are large in use amount and are important pollution sources in haze weather in China, so that a boiler policy for changing industrial or domestic coal-fired boilers into fuel oil or natural gas is recently set in large and medium cities in China, so that the outstanding contradiction between boiler coal burning and the environment can be solved, the boiler can be operated in policy under the background that various petroleum import pipelines are laid in China, and the policy of changing coal into oil or changing coal into gas in the boiler can be kept continuous at present for a certain period of time.
At present, in oil-fired boilers, SZS oil-fired boilers used by industrial and domestic boilers are huge in number mainly because of simple structure, high automation degree, short production and installation period and strong adaptability of small and medium boilers, so that the SZS oil-fired boilers are favored by users and have higher market share. With the increasing restriction range and tonnage of coal-fired boilers of national and local governments, the SZS-type boilers have come to a large development period, the typical structure of the boiler mainly comprises two parts, one side of the boiler is an offset hearth, a burner is arranged at the end of the hearth, the hearth is used as a space for providing fuel combustion, water-cooling membrane wall heating surfaces are arranged around the hearth, the heating surfaces play roles of heat absorption and sealing, and the heating surfaces mainly absorb the radiant heat of flame, so the boiler is called as a radiant heating surface; the superheater and the convection bank or only the convection bank are arranged on the other side, the heating surfaces are used for absorbing heat emitted by flowing of flue gas and are collectively called as convection heating surfaces, and the peripheries of the two parts are completely sealed by water-cooling membrane walls, so that the two parts can be integrally assembled in a boiler manufacturing unit and then delivered out of a factory, the installation is convenient after the boiler manufacturing unit arrives at a site, the installation time is shortened, and the use by a user is convenient. In the design and the use of this kind of boiler, because the restriction of structure and transportation, the furnace of boiler generally designs less, and the heat that discharges when fuel is inside burning in furnace can not in time be absorbed by surrounding single-deck membrane wall like this, has caused the inside temperature of furnace very high, can reach about 1400 ℃ sometimes, two main problems appear like this: firstly, because the temperature is above 1200 ℃, a large amount of thermal oxynitride of the boiler is generated, which is contrary to the current environmental protection policy, in order to reduce the generation of oxynitride, the combustion only reduces the supply of oxygen as much as possible, so that the fuel combustion is incomplete, a large amount of CO is generated, the fuel is wasted, and the boiler operator is not safe; secondly, the arrangement of the furnace outlet of the boiler and the subsequent convection heating surface is difficult, which mainly shows two aspects: the method comprises the following steps that firstly, because the temperature of flue gas at the outlet of a hearth is too high, a superheater cannot be arranged at the outlet of the hearth, burning-out of the superheater is avoided, the method is contrary to the idea that the superheater needs to be arranged at the highest position of the temperature of the flue gas, and if the superheater is arranged at the outlet of the hearth during installation, the superheater can be positioned on two sides of the superheater, so that the superheater is easy to install and check; secondly, because the flue gas temperature at the outlet of the hearth is too high (some reach about 1400 ℃), in order to reduce the flue gas temperature at the outlet of the boiler, more convection heating surfaces have to be arranged, which is contrary to the concept that a compact boiler needs to be designed, the size of which is convenient to transport and install, and as a result, a part of the heating surfaces are moved outside the boiler, and the energy-saving heating surfaces of the boiler are increased. For an SZS type oil burning boiler, due to the limitation of structure and transportation, the heat absorption capacity of a single-layer water-cooling membrane wall arranged around a traditional hearth is limited, so that the temperature in the hearth of the boiler is overhigh, the temperature of smoke at the outlet of the hearth is overhigh, the generation of oxynitride is increased, the generation of oxynitride can be reduced by adopting a low oxygen supply method, but fuel combustion is incomplete, the temperature of the smoke at the outlet of the hearth is overhigh, so that the arrangement of a heating surface is difficult, the integral steel consumption and the installation of the boiler are increased, and the energy conservation and consumption reduction of the boiler are not facilitated.
The other key point in reducing nitrogen oxide emission is to reduce the oxygen content of the boiler, but because the oil burning boiler is burning, in order to have better atomization to the fuel oil, usually the method is reached by increasing the air quantity and the air pressure, but the load of the boiler is lower, the air quantity required by the boiler burning is also reduced, thus the fuel oil atomization is not good, the insufficient burning condition occurs, in this case, only the air supply quantity is increased to achieve better atomization effect, therefore, the current general method is to adopt the flue gas recirculation technology, on one hand, the quantity of the atomization gas is increased, on the other hand, the oxygen supply quantity is not increased, so that when the load of the boiler is lower, the increase of the boiler nitrogen oxide compound is not caused by the relative increase of the oxygen supply quantity. Therefore, the flue gas recirculation technology is very effective in reducing the emission of nitrogen oxides of the boiler. However, when flue gas recirculation is adopted, two problems which cannot be avoided exist, so that the technology is difficult to popularize, the first problem is corrosion, the flue gas contains sulfur and other pollutants after fuel combustion, the sulfur always exists in the flue gas, and excessive moisture is avoided in the flue gas, so when flue gas recirculation is adopted, the extracted flue gas contains the corrosive sulfur, the flue gas is dried, because the air temperature is normal temperature, although the temperature of the flue gas is generally about 120 ℃, the proportion of the flue gas is small after the flue gas and the air are mixed, the temperature of the mixed gas is generally below an acid dew point, so that the blades of a fan are firstly corroded when the air and the flue gas are mixed and enter an air blower, the pipe in the air preheater is corroded, the pipe wall of the pipe in the air preheater is high, the pipe wall is thin, the leakage is quickly corroded, once the leakage occurs, the measure of blocking the pipe of the air preheater is adopted to reduce the leakage of the smoke, the temperature of the exhaust smoke of a boiler is quickly increased, on the one hand, fuel is wasted, the efficiency is reduced, and the other hand, a large amount of the leakage is needed to be stopped for maintenance or the air preheater is replaced, and great economic loss is caused. Secondly, the mixing uniformity of the air and the flue gas is not enough, and the content of the oxygen injected into the hearth can not meet the specified requirements locally, so that the efficiency of supporting fuel combustion in the hearth is not enough; thirdly, due to the existence of incomplete combustion, more combustible gas CO contained in the flue gas is wastefully discharged into the atmosphere and pollutes the atmosphere.
Disclosure of Invention
The invention aims to solve the technical difficulties of high combustion temperature and more oxygen supply during combustion in the prior art, and provides an oil-fired boiler capable of fully reducing the generation of nitrogen oxides.
In order to solve the technical problem, the invention adopts the following technical scheme: an oil-fired boiler capable of fully reducing nitrogen oxide production comprises a boiler body, a hearth is arranged on the right side inside the boiler body, a burner mounting hole is formed in the right side of the front portion of the boiler body, a boiler burner is installed in the burner mounting hole, water-cooling membrane type walls are arranged on the inner walls around the hearth, an upper boiler barrel and a lower boiler barrel are arranged on the left side of the boiler body, the upper boiler barrel and the lower boiler barrel are communicated through a convection tube bundle, a hearth smoke outlet is formed in the rear portion of the water-cooling membrane type wall on the left side, a superheater is arranged between the upper boiler barrel and the lower boiler barrel and located at a hearth smoke outlet, a boiler smoke outlet is formed in the front portion of the left side of the boiler body, the inner sides of water-cooling film type walls on the periphery of the hearth are uniformly provided with a plurality of spiral fin tubes, the water-cooling film type walls surround an outer hearth, the spiral fin tubes surround an inner hearth, the water-cooling film type walls and the spiral fin tubes form a composite water-cooling hearth in the hearth, each spiral fin tube is vertically arranged between an upper boiler barrel and a lower boiler barrel, the distance between each spiral fin tube and the water-cooling film type wall is greater than the pipe diameter of a water pipe of the water-cooling film type wall, the upper ends of all the spiral fin tubes extend into the upper boiler barrel, the lower ends of all the spiral fin tubes extend into the lower boiler barrel, and the length of the spiral fin tubes extending into the upper boiler barrel and the lower boiler barrel is not greater than 10mm; when the boiler is installed, the spiral fin tube is assembled in place before the water-cooled membrane wall, and the spiral fin tube and the water-cooled membrane wall perform composite water cooling on the hearth, so that the smoke temperature at a smoke outlet of the hearth is controlled below 950 ℃;
the boiler smoke outlet is connected with the boiler burner through a smoke treatment mixing system; the flue gas treatment mixing system comprises an air preheater, a flue gas static pressure box, an air static pressure box, a sulfur removal device, a quick lime dryer, a flue gas and oxygen primary mixer, a blower and a flue gas and oxygen secondary mixer;
the boiler smoke outlet is connected with a high-temperature gas inlet of an air preheater through a first smoke pipeline, an air outlet of the air preheater is connected with an air inlet of an air static pressure box through a first air pipeline, a low-temperature gas outlet of the air preheater is connected with an air inlet of a sulfur removal device through a second smoke pipeline, an air outlet of the sulfur removal device is connected with the middle of the smoke static pressure box through a third smoke pipeline, the top of the smoke static pressure box is connected with an air inlet of a quicklime dryer through a fourth smoke pipeline, an air outlet of the quicklime dryer is connected with a smoke inlet of a smoke-oxygen primary mixer through a fifth smoke pipeline, the air static pressure box is connected with an air inlet of the smoke-oxygen primary mixer through a second air pipeline, the smoke-oxygen primary mixer is connected with an air inlet of a blower through a first mixing pipeline, an air outlet of the smoke-oxygen secondary mixer is connected with a mixed gas inlet of a smoke-oxygen secondary mixer through a second mixing pipeline, an air inlet of the smoke-oxygen secondary mixer is connected with the air box through a third air pipeline, a mixed gas outlet of the smoke-oxygen secondary mixer is connected with a mixed gas supply pipe, and an air supply pipe of the mixed gas is connected with an air supply pipe of a static pressure mixer;
the fifth flue gas pipeline is provided with a flue gas regulating valve, the third air pipeline is provided with an air secondary mixing regulating valve, the second mixing pipeline is provided with a first oxygen content sensor, the mixed gas air supply pipe is provided with a mixed gas regulating valve and a second oxygen content sensor, and the second oxygen content sensor is positioned between the mixed gas regulating valve and the flue gas oxygen secondary mixer.
The flue gas static pressure box comprises a flue gas diffusion pipe and a barrel body which is of a cuboid structure, the upper end and the lower end of the barrel body are both open, an upper cover shell with a sharp upper end and a wide lower end and in a square cone shape is arranged at the top of the barrel body, a lower cover shell with a sharp lower end and a wide upper end and in a square cone shape is arranged at the bottom of the barrel body, the flue gas diffusion pipe is horizontally arranged in the middle of the barrel body, a gas outlet of the flue gas diffusion pipe is fixedly connected with the inner wall of the barrel body and is blocked, a gas inlet of the flue gas diffusion pipe extends out of the barrel body and is connected with a gas outlet of a third flue gas pipeline, and diffusion holes are uniformly formed in the lower part of the flue gas diffusion pipe in the barrel body along the length direction; the inner walls of the cylinder body, the upper housing and the lower housing are coated with anti-corrosion heat-insulation layers, the top of the upper housing is connected with an inlet of a fourth flue gas pipeline, the bottom of the lower housing is connected with a discharge pipe, and a discharge valve is arranged on the discharge pipe.
The primary flue gas-oxygen mixer comprises a gas mixing box, a gas gathering gas mixing cover, a flue gas inlet pipe, two air inlet pipes and a mixed gas outlet pipe, wherein the gas mixing box is formed by an upper box plate, a lower box plate, a left box plate, a right box plate, a front box plate and a rear box plate which are encircled into a cuboid shape, the flue gas inlet pipe and the mixed gas outlet pipe are horizontally arranged along the left-right direction, the central lines of the gas gathering gas mixing cover, the flue gas inlet pipe and the mixed gas outlet pipe are superposed, the left end of the flue gas inlet pipe extends out of the middle part of the left box plate and is connected with a gas outlet of a fifth flue gas pipeline, the right end of the flue gas inlet pipe is fixedly and hermetically connected with the left side wall of the right box plate, gas outlets of the two air inlet pipes are respectively connected with the middle parts of the front box plate and the rear box plate, the gas inlets of the two air inlet pipes are connected with a gas outlet of a second air pipeline, the gas mixing box is internally provided with the front baffle and the rear baffle which are used for dividing the interior of the gas mixing box into a front cavity, the mixing cavity, the left side wall of the mixing box and the right box plate into a conical shape, and the left side wall of the gas gathering gas outlet pipe is connected with the left side wall of the mixing cover, and is connected with the mixed gas outlet pipe, and is connected with the left side wall of the mixed gas mixing cover;
evenly set up a plurality of flue gas inlet hole that is located the gas mixing incasement along the circumferencial direction in the flue gas intake pipe, all seted up a plurality of air inlet hole on preceding baffle and the back baffle, set up the gas mixture venthole that a plurality of will mixing chamber and gather the inside intercommunication of gas mixing cover on the right side board, set up on the gas mixture outlet duct and be located the inside gas mixture exhaust hole of gathering gas mixing cover, the gas outlet of gas mixture outlet duct is connected with the air inlet of first hybrid tube.
The smoke and oxygen secondary mixer includes the jet-propelled pipe that sets up with the axial, the transition pipe, jet-propelled pipe and mixed divergent pipe, the air inlet of jet-propelled pipe is connected with the gas outlet of second hybrid piping, the gas outlet of jet-propelled pipe is connected with the air inlet of jet-propelled pipe, the gas outlet of jet-propelled pipe is connected with the air inlet of transition pipe, the gas outlet of transition pipe is connected with the air inlet of mixed divergent pipe, the gas outlet of mixed divergent pipe is connected with the air inlet of gas mixture air supply pipe, jet-propelled pipe is the circular cone section of thick bamboo structure that the air inlet is greater than the gas outlet, jet-propelled pipe is the circular cone section of thick bamboo structure that the gas outlet is greater than the air inlet, be connected with the drainage tube on the transition section of thick bamboo, the neighbouring jet-propelled pipe one side of air inlet end of drainage tube, the air inlet and the gas outlet of third air duct of drainage tube are connected.
The desulfurizing device comprises a desulfurizing box, a suction pump, a liquid suction pipe and a spray plate, wherein a pore plate which divides the inside of the desulfurizing box into an upper spray chamber and a lower liquid storage chamber is horizontally arranged in the desulfurizing box, the spray plate is of a hollow structure and is horizontally arranged on the inner wall of the top of the desulfurizing box, the spray plate is of a hollow structure, a plurality of spray heads are uniformly arranged on the lower surface of the spray plate, at least three upper baffles are arranged on the lower surface of the spray plate along the vertical direction, at least three lower baffles are arranged on the upper surface of the pore plate along the vertical direction, the front sides and the rear sides of the upper baffles and the lower baffles are respectively and fixedly connected with the inner wall of the front side and the inner wall of the rear side of the desulfurizing box, the upper baffles and the lower baffles are uniformly arranged at intervals, gaps are respectively arranged between the upper baffles and the pore plate and between the lower baffles and the spray plate, and the left side and the right side of the desulfurizing box are respectively connected with the gas outlet of the second flue gas pipeline and the gas inlet of the third flue gas pipeline;
the sulfur removal box is characterized in that an alkaline solution is contained in a liquid storage chamber of the sulfur removal box, a suction pump is positioned on the left side of the sulfur removal box, an inlet of the suction pump is connected with a suction pipe extending into the upper part of the alkaline solution, an outlet of the suction pump is connected with an inlet of a liquid suction pipe, the upper part of the liquid suction pipe is arranged on the top of the sulfur removal box in parallel, and the liquid suction pipe is communicated with the inside of the spraying plate through a plurality of liquid distribution pipes;
a lower liquid level meter positioned at the upper part of the suction pipe and an upper liquid level meter positioned on the lower surface of the pore plate are arranged in a liquid storage chamber of the sulfur removal tank, an alkaline solution adding port is formed in the lower part of the right side of the sulfur removal tank, and a blocking plate is arranged at the alkaline solution adding port;
the inside of the liquid storage chamber of the sulfur removal tank is provided with a guide plate, the guide plate is positioned above the suction pipe and is obliquely arranged in a left-high-right direction, and the edges of the left side, the front side and the rear side of the guide plate are fixedly connected with the inner walls of the left side, the front side and the rear side of the sulfur removal tank respectively.
Quick lime desicator includes the drying cabinet, the rectangular pyramid type structure big end down is on the upper portion of drying cabinet, the rectangular pyramid type structure big end down is on the lower part of drying cabinet, horizontal direction is provided with upper track and lower floor's track about along in the drying cabinet, it is provided with frame and underframe to slide in the upper track, all be equipped with quick lime ball through the pocket in upper frame and the underframe, the opening that is used for horizontal pull upper frame and underframe is seted up on the right side of drying cabinet, the opening part is provided with the closing plate.
And a booster fan positioned on the air outlet side of the quicklime dryer is arranged on the fifth flue gas pipeline.
The spiral finned tube is composed of a spiral finned tube body and fins, wherein the spiral finned tube body and the fins are integrally formed by a metal material through a hot rolling technology and are rolled for multiple times to form the spiral finned tube with equal screw pitch, the cross section of each fin is trapezoidal, and the fins form a spiral line shape in the axial direction of the spiral finned tube body.
The device also comprises a pressurizing water spraying device for enhancing the circulating flow speed of cooling water in the spiral fin tube;
the pressurizing water spraying device comprises a first mounting frame, a second mounting frame, two water feeding pumps and two water supply pipes, wherein the first mounting frame and the second mounting frame are arranged at the bottom in a lower boiler barrel, the two water supply pipes extend into the lower boiler barrel from the rear end of the lower boiler barrel along the direction parallel to the central line of the lower boiler barrel, the two water supply pipes are respectively mounted on the first mounting frame and the second mounting frame through U-shaped bolts, gaskets and nuts, the front ends of the water supply pipes are plugged, the rear end of each water supply pipe corresponds to the water outlet of one water feeding pump and is connected with the water outlet of the water feeding pump, a control valve located outside the boiler body is respectively arranged on each water supply pipe, the two water supply pipes are communicated through a plurality of connecting pipes, a plurality of injection pipes are connected to one water supply pipe along the length direction, the injection port of each injection pipe corresponds to the lower port of one spiral fin pipe, the distance between the injection port of each injection pipe and the lower port of the spiral fin pipe is 2-4mm, and the inner diameter of the injection port of the injection pipe is 3-5mm.
The spiral finned tubes are arranged in a mode that the direction from the burner mounting hole to the smoke outlet of the hearth gradually changes from density to density, and the spiral finned tubes and the water pipes of the water-cooling film type wall are arranged in a staggered mode at intervals.
By adopting the technical scheme, the invention adopts two measures to reduce the generation of nitrogen oxides: firstly, reducing the internal temperature of a hearth; and secondly, the discharged flue gas is mixed with air to reduce the oxygen content in the air, the air with lower oxygen content is circularly provided for the combustor of the boiler, and simultaneously, unburned and complete CO in the flue gas is recycled.
The first measure is specifically based on the principle and technical measure that:
in order to fully utilize the limited space of the hearth, the arranged water-cooled tubes are spiral fin tubes, the spiral fin tubes are integrally hot-rolled, the heat absorption area of the flame side is increased, in order to not influence the heat absorption of the water-cooled membrane wall, the outer edges of the arranged spiral fin tubes are at least larger than the pipe diameter of a water pipe of the membrane wall from the membrane wall, the spiral fin tubes and the water pipe of the water-cooled membrane wall are arranged in a staggered mode at intervals, the number of the spiral fin tubes is preferably reduced to be lower than 950 ℃ of the temperature in the hearth, the generation of nitrogen oxides can be well controlled at the temperature, meanwhile, a superheater can be arranged at a smoke outlet of the hearth, the phenomenon that the pipe explosion is caused by too large heat load of the superheater and poor heat absorption of superheated steam is avoided, the radiation space in the hearth is fully utilized, the volumes of the hearth and the boiler can be increased, and the heat exchange volume can be reduced when the same smoke exhaust temperature is maintained, the arrangement of a tube bundle between an upper boiler barrel and a lower boiler barrel can be reduced, and the weight of the boiler and the whole boiler and the overall volume of the boiler can be reduced.
The method for increasing the boiler expansion water-cooling hearth specifically comprises the following steps: the invention is characterized in that water cooling tubes are additionally arranged on the water cooling membrane walls around the hearth and are close to the water cooling membrane walls to form an internal scattered tube hearth, the hearth and the original water cooling membrane walls form a composite water cooling structure hearth, the internal water cooling tubes can be formed by light tubes or finned tubes, the invention preferentially adopts an integral spiral finned tube, the spiral finned tube is formed by a hot rolling technology and is rolled for multiple times, a spiral finned tube body and fins are integrally formed, the fins and the spiral finned tube body are not welded and are made of the same material, the cross section of the fins is trapezoidal, the fins form a spiral line shape in the axial direction of the spiral finned tube body, the structure is beneficial to heat diffusion and disturbance in smoke heat transfer, so the heat transfer coefficient of the spiral finned tube is very high, the heat transfer area per unit length is large, and the heating area can be multiplied by the number of the spiral finned tube bodies which can be arranged in a limited space. The fuel oil boiler is provided with an upper boiler barrel and a lower boiler barrel arrangement structure, a spiral fin tube can be directly inserted between the upper boiler barrel and the lower boiler barrel, an insertion type structure is adopted, the upper end part and the lower end part of the spiral fin tube penetrate through the boiler barrel wall and extend into the boiler barrel, so that the end parts of the spiral fin tube in the upper boiler barrel and the lower boiler barrel can be deeply buried in water when the boiler operates, the safe heat exchange of the upper boiler barrel and the lower boiler barrel during radiation heat exchange is ensured, the spiral fin tube is connected with the boiler barrel in a sealing welding mode in the boiler barrel, the length of the spiral fin tube extending into the boiler barrel is not more than 10mm, the distance between the outer edge of the spiral fin tube arranged in the boiler barrel and the membrane wall of the boiler barrel is at least larger than the pipe diameter of a water pipe of one membrane wall, the number of the spiral fin tube is suitable for reducing the temperature in the boiler barrel to below 950 degrees (the temperature can meet the radiation heat exchange and reduce the generation of oxynitride), the strength requirement of the boiler barrel, the spiral fin tube is further met, the inner layer arrangement is required, the inner layer arrangement of the spiral fin tube is required for reducing the temperature of the water cooling fin tube, and the water cooling fin tube is not required for reducing the temperature of the water when the inner side of the boiler barrel, and the water cooling fin tube, the water is not required for reducing the water, and the inner side of the water cooling fin tube, the water is suitable for reducing the water of the water, and the water cooling fin tube, the water of the boiler barrel.
Because the heat transfer in the hearth belongs to radiation heat transfer, the heat intensity is high, in order to increase the safety of water circulation, a pressurizing water spraying device is arranged at the lower end opening of the spiral fin tube of the inner hearth, a control valve is arranged on a water supply pipe, the control valve is kept fully open in the operation process, the resistance of water spraying is controlled by the size of a water spraying opening, the control valve is closed when the boiler is stopped, an injection pipe is arranged on the water supply pipe, the injection opening of the injection pipe corresponds to the lower end opening of the spiral fin tube, the distance between the injection opening of the injection pipe and the lower end opening of the spiral fin tube is kept at about 3mm, the size of the injection opening of the injection pipe is generally kept at 3-5mm, high-pressure water (the flow speed is about 5 m/s) sprayed by the injection opening of the injection pipe, compensation is provided for the possible insufficient water circulation power of the spiral fin tube, the high reliability of the water circulation of the spiral fin tube is ensured, and the temperature in the hearth is further easily reduced. In addition, the invention adopts two water feeding pumps and two water supplying pipes, and the two water supplying pipes are connected through a plurality of connecting pipes, thus not only greatly enhancing the flow speed of water sprayed by the spraying pipes, but also leading one water feeding pump to continue working when the other water feeding pump fails or is overhauled, thereby ensuring that the operation of pressurizing water is carried out continuously and ensuring that the temperature in the hearth does not fluctuate greatly.
After adopting compound water-cooled furnace, if the boiler has the over heater, can arrange the over heater directly in the furnace export, need not arrange convection bank at the furnace export according to original arrangement earlier, then arrange the over heater again, made things convenient for the installation and the inspection of over heater, to same boiler outlet flue gas temperature, can be less arrange convection bank, reduce the volume of boiler, reduce the whole steel consumption of boiler, do not reduce the wholeness ability of boiler.
The specific air supply flow of the second measure to the air required in the hearth is as follows: high-temperature flue gas generated in a boiler body enters an air preheater through a first flue gas pipeline to carry out heat exchange on air preheated by the air preheater, the heat-exchanged flue gas enters a desulfurizing device through a second flue gas pipeline to carry out spraying and desulfurizing, then the flue gas enters a static pressure box, most of the flue gas is discharged from a discharge pipe at the bottom of a lower housing, the discharge speed can be adjusted through a discharge valve, a small amount of flue gas enters a quicklime drier through a fourth flue gas pipeline to adsorb water vapor in the flue gas, and the dried flue gas enters a flue gas inlet pipe in a flue gas-oxygen primary mixer through a fifth flue gas pipeline; simultaneously, preheated air enters the air static pressure box, most of the air enters the primary smoke-oxygen mixer from a second air pipeline and two air inlet pipes, smoke and air in the primary smoke-oxygen mixer are uniformly mixed and then mixed gas is sent into the secondary smoke-oxygen mixer from a blower through a second mixing pipeline, when the oxygen content of the mixed gas is detected to be less by a first oxygen content sensor, an air secondary mixing regulating valve is opened, the air enters the secondary smoke-oxygen mixer from a third air pipeline and a drainage pipe to be mixed again, and after the oxygen content in the mixed gas is detected to reach the specified requirement by a second oxygen content sensor, the opening degree of the air secondary mixing regulating valve is fixed; and finally, supplying qualified mixed gas to a burner at the front part of the hearth of the boiler body through a mixed gas supply pipe.
The principle and the function of the sulfur removal device are as follows: because the flue gas discharged from the oil-fired boiler contains a large amount of SO 2 The invention adopts a spraying sulfur removal mode, the flue gas enters from the left side of the sulfur removal box, sequentially passes through a baffling channel formed between an upper baffle and a lower baffle and then is discharged from the right side of the sulfur removal box, meanwhile, an alkaline solution enters into the spraying plate through a suction pipe, a liquid suction pipe and a liquid separation pipe by a suction pump, a spray head uniformly sprays the alkaline solution downwards into the spraying chamber, the flue gas in the baffling channel is sprayed, and meanwhile, the alkaline solution and SO are sprayed 2 Carrying out a chemical reaction to SO 2 And removing the water, and enabling the spray water to fall into the liquid storage chamber from the pore plate for precipitation and recycling. Because the suction tube is located the left side of stock solution room, consequently set up the guide plate in the top of suction tube, make the left solution of orifice plate along the guide plate right, deposit on stock solution room right side, can make the suction tube extraction deposit the clean solution after the filtration like this. When the liquid level of the alkaline solution is too high or too low, the lower liquid level meter and the upper liquid level meter send out an alarm to remind workers to treat the alkaline solution, and the damage to the solution after the solution cannot be pumped by the suction pump is avoided. When the alkaline solution is decreased, the alkaline solution is added through the alkaline solution addition port.
The specific principle and the function of the flue gas static pressure box are as follows: the main gas component in the desulfurized flue gas is CO 2 And also unburned CO gas, which is compared with CO 2 Lighter, naturally float upwards to the upper housing and be discharged into the quicklime dryer through the fourth flue gas pipeline, so that the combustible body in the flue gas can be pumped back into the boiler for repeated combustion and utilization, the energy consumption is reduced, the pollution is reduced, and heavier CO 2 The sewage sinks into the lower housing and is discharged by a discharge pipe; the flue gas emission pipe is horizontally arranged in the middle of the cylinder, and the gas emission holes are arranged at the lower part of the flue gas emission pipe, so that the flue gas uniformly sinks in the cylinder, the lighter CO gas floats upwards, and good CO and CO are achieved 2 The separation effect of (4).
The specific principle and the function of the primary smoke-oxygen mixer are as follows: the flue gas intake pipe of the primary mixer for flue gas and oxygen is led into the middle part in the mixing cavity, and is uniformly dispersed into the mixing cavity through a flue gas inlet hole, two air intake pipes are uniformly distributed through the air inlet holes on the front partition plate and the rear partition plate, and then enter the mixing cavity to be mixed with the flue gas, the mixed gas enters the gas-gathering gas mixing cover through a mixed gas exhaust hole on the right side plate, because the gas-gathering gas mixing cover is a conical structure with thick left and thin right, the mixed gas is gradually reduced in cross section when moving from left to right in the gas-gathering cover, the mixed gas is further fully mixed, and the mixed gas which is uniformly mixed finally enters the mixed gas outlet pipe through the mixed gas exhaust hole to be discharged. The right end edge of the gas-gathering gas-mixing cover is fixedly connected with the outer wall of the gas-mixing outlet pipe, so that the strength of the gas-mixing outlet pipe of the mixer is enhanced.
The smoke and oxygen secondary mixer adopts the principle of the Venturi effect, on the premise that the air blower provides high air pressure, when mixed gas firstly passes through the flow cross section of the jet pipe, the flow velocity of fluid is increased, then when the flow velocity of the air flow passes through the mixing divergent pipe, the flow cross section is gradually increased, the increase of the flow velocity is accompanied with the reduction of the fluid pressure according to the principle that the flow velocity is in inverse proportion to the flow cross section and the Bernoulli's law, namely the common Venturi effect, the effect means that low pressure can be generated near the high-speed flowing fluid, so that the transition pipe generates adsorption action, air is adsorbed into the mixed gas to be mixed again, and the oxygen concentration in the mixed gas can reach the specified requirement.
The invention specifically adopts a quick lime ball to absorb the water vapor, the quick lime generates chemical reaction in the process of absorbing the water content to generate heat, the flue gas can be heated, the temperature of the flue gas is increased, and the reduction of the temperature of the flue gas caused by spraying is compensated. In addition, when the quicklime ball absorbs moisture and reaches saturation, the sealing plate can be opened, the upper frame and the lower frame are drawn out, the quicklime ball in the mesh bag is replaced, and the operation is convenient. The upper portion of drying cabinet is big end down's rectangular pyramid type structure, and the lower part of drying cabinet is big end down's rectangular pyramid type structure, and this structure can make the flue gas when passing through quick lime ball, and gas equipartition nature is stronger.
Because the flue gas can reduce a lot through quick lime desicator back atmospheric pressure, consequently be provided with the booster fan that is located quick lime desicator gas outlet side on fifth flue gas pipeline, mix for cigarette oxygen once and provide power.
In conclusion, the invention well solves the following problems that under the condition that the leading-out point of the flue gas is kept unchanged, the mixing point of the flue gas is placed at the rear part of the outlet of the air preheater, then the hot air and the flue gas from the air preheater are introduced into a primary flue gas-oxygen mixer together, a blower is arranged at the outlet of the primary flue gas-oxygen mixer, the mixed gas of the flue gas and the hot air is sent into a fluidized bed and a hearth secondary air through the blower, and when the oxygen content in the mixed gas is insufficient, the air can be introduced again through the secondary flue gas-oxygen mixer. And in the gas supply process, the treatment processes of removing sulfur, recycling CO, drying flue gas, heating and the like are carried out.
The invention can find that the problem of reducing the generation of nitrogen oxides by an oxygen control mode when the oil-fired boiler is under low load is well solved, and simultaneously, the invention has the following advantages when the flue gas recirculation is used, and the corrosion problem is well solved firstly: because the hot air from the air preheater is generally above 120 ℃, the flue gas temperature is about 140 ℃, the temperature after the mixing of the primary flue gas and oxygen mixer is much higher than the acid dew point, the air blower can not be corroded when entering the air blower, and because the air enters the air preheater, the air can not have acid corrosion to the steel pipe of the air preheater, the corrosion problem is thoroughly solved, the maintenance of the boiler is reduced, the running time of the boiler is prolonged, and good economic benefits are obtained; the second reduces power consumption: because the flue gas does not pass through the air preheater with multiple return strokes, the resistance of the air preheater is not increased, the resistance is relatively reduced, the power consumption is reduced, and good economic benefit is obtained; the third fuel is mixed more evenly: after the flue gas and the air are mixed, the total air volume is not reduced, and the content of oxygen in the mixed gas is ensured, so that the fuel in the hearth is well mixed, the utilization rate of the oxygen is high, the fuel is fully combusted, and the excessive oxygen is hardly used due to the matching of the oxygen demand and the oxygen supply of the fuel, so that the emission of nitrogen oxides is lower; according to the invention, the temperature of the hearth and the temperature of the outlet of the hearth are reduced when the volume of the boiler is not increased or even reduced, the generation amount of thermal nitrogen oxides of the boiler is reduced, the arrangement of a superheater is facilitated, and the integral steel consumption of the boiler is reduced. After the measures, the amount of air supplied for atomization by the boiler is not reduced, but the oxygen content of the boiler participating in combustion is reduced, and the measure of reducing combustion oxygen supply is adopted to reduce the generation of nitrogen oxides in the boiler.
By combining the two measures of reducing the temperature of the hearth and controlling the combustion oxygen supply amount, the emission of the nitrogen oxides of the boiler during fuel oil can reach the emission value required by the state under the condition of not adopting a special denitration device.
Drawings
FIG. 1 is a front view of a boiler body according to the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a left side view of FIG. 1;
FIG. 4 is an enlarged view of the pressurized water jet system of FIG. 3;
FIG. 5 is an enlarged schematic view of the helical finned tube of FIG. 2;
FIG. 6 is a cross-sectional view of the fins of the spiral finned tube of FIG. 5
FIG. 7 is a schematic flow diagram of the flue gas treatment mixing system of the present invention;
FIG. 8 is a schematic view of the structure of the flue gas plenum of FIG. 7;
FIG. 9 is a schematic view of the primary mixer for flue gas and oxygen in FIG. 7;
FIG. 10 is a schematic diagram of the construction of the flue gas secondary mixer of FIG. 7;
FIG. 11 is a schematic view of the sulfur removal unit of FIG. 7;
fig. 12 is a schematic view of the construction of the quicklime dryer of fig. 7.
Detailed Description
As shown in fig. 1 to 12, the oil boiler of the present invention for sufficiently reducing the generation of nitrogen oxides comprises a boiler body 9, a furnace 79 is provided on the right side inside the boiler body 9, a burner mounting hole 80 is provided on the right side of the front portion of the boiler body 9, a boiler burner 21 is installed in the burner mounting hole 80, water-cooling membrane walls 81 are provided on the inner walls around the furnace 79, an upper boiler tube 82 and a lower boiler tube 83 are provided on the left side of the boiler body 9, the upper boiler tube 82 and the lower boiler tube 83 are communicated with each other through a convection tube bundle 84, a furnace smoke outlet 99 is provided on the rear portion of the water-cooling membrane wall 81 on the left side, a superheater 85 is arranged between the upper boiler barrel 82 and the lower boiler barrel 83 and positioned at a hearth smoke outlet 99, a boiler smoke outlet 86 is arranged at the front part of the left side of the boiler body 9, a plurality of spiral fin tubes 87 are uniformly arranged in the hearth 79 along the water-cooling membrane wall 81 around the hearth 79 along the vertical direction, the distance between each spiral fin tube 87 and the water-cooling membrane wall 81 is greater than the pipe diameter of a water pipe of the water-cooling membrane wall 81, the upper ends of all the spiral fin tubes 87 extend into the upper boiler barrel 82, the lower ends of all the spiral fin tubes 87 extend into the lower boiler barrel 83, and the length of the spiral fin tubes 87 extending into the upper boiler barrel 82 and the lower boiler barrel 83 is not more than 10mm; when the boiler is installed, the spiral fin tubes 87 are assembled in place before the water-cooling membrane type wall 81, and the spiral fin tubes 87 and the water-cooling membrane type wall 81 perform composite water cooling on the hearth 79, so that the temperature of 99 smoke at the smoke outlet of the hearth is controlled below 950 ℃;
the boiler smoke outlet 86 is connected with the boiler burner 21 through a smoke treatment mixing system; the flue gas treatment mixing system comprises an air preheater 1, a flue gas static pressure box 2, an air static pressure box 3, a sulfur removal device 4, a quicklime dryer 5, a smoke and oxygen primary mixer 6, a blower 7 and a smoke and oxygen secondary mixer 8;
a boiler smoke outlet 86 is connected with a high-temperature gas inlet of an air preheater 1 through a first smoke pipeline 10, an air outlet of the air preheater 1 is connected with a gas inlet of an air static pressure box 3 through a first air pipeline 11, a low-temperature gas outlet of the air preheater 1 is connected with a gas inlet of a sulfur removal device 4 through a second smoke pipeline 12, a gas outlet of the sulfur removal device 4 is connected with the middle part of the smoke static pressure box 2 through a third smoke pipeline 13, the top part of the smoke static pressure box 2 is connected with a gas inlet of a quicklime drier 5 through a fourth smoke pipeline 14, a gas outlet of the quicklime drier 5 is connected with a smoke inlet of a smoke and oxygen primary mixer 6 through a fifth smoke pipeline 15, the air static pressure box 3 is connected with a gas inlet of the smoke and oxygen primary mixer 6 through a second air pipeline 16, the smoke and oxygen primary mixer 6 is connected with a gas inlet of a blower 7 through a first mixing pipeline 17, a gas outlet of the blower 7 is connected with a mixed gas inlet of the smoke and oxygen secondary mixer 8 through a second mixing pipeline 18, an air inlet of the smoke and oxygen secondary mixer 8 is connected with a gas inlet of a gas supply pipe 20 of a smoke and a gas mixing boiler;
a smoke regulating valve 23 is arranged on the fifth smoke pipeline 15, an air secondary mixing regulating valve 24 is arranged on the third air pipeline 19, a first oxygen content sensor 25 is arranged on the second mixing pipeline 18, a mixed gas regulating valve 26 and a second oxygen content sensor 27 are arranged on the mixed gas air supply pipe 20, and the second oxygen content sensor 27 is positioned between the mixed gas regulating valve 26 and the smoke and oxygen secondary mixer 8.
The flue gas static pressure box 2 comprises a flue gas diffusion pipe 28 and a barrel 29 in a cuboid structure, the upper end and the lower end of the barrel 29 are both open, an upper cover shell 30 with a sharp upper end and a wide lower end and a square conical shape is arranged at the top of the barrel 29, a lower cover shell 31 with a sharp lower end and a wide upper end and a square conical shape is arranged at the bottom of the barrel 29, the flue gas diffusion pipe 28 is horizontally arranged in the middle of the barrel 29, an air outlet of the flue gas diffusion pipe 28 is fixedly connected with the inner wall of the barrel 29 and is blocked, an air inlet of the flue gas diffusion pipe 28 extends out of the barrel 29 and is connected with an air outlet of a third flue gas pipeline 13, and diffusion holes 32 are uniformly formed in the lower part of the flue gas diffusion pipe 28 in the barrel 29 along the length direction; the inner walls of the cylinder 29, the upper housing 30 and the lower housing 31 are coated with anti-corrosion heat-insulating layers, the bottom of the lower housing 31 is connected with a discharge pipe 33, and the discharge pipe 33 is provided with a discharge valve 34. By adjusting the opening of the discharge valve 34, the standing degree of the flue gas in the flue gas static pressure box 2 can be adjusted.
The primary flue gas-oxygen mixer 6 comprises a gas mixing box, a gas gathering gas mixing cover 36, a flue gas inlet pipe 37, two air inlet pipes 38 and a mixed gas outlet pipe 39, wherein the gas mixing box is formed by an upper box plate, a lower box plate, a left box plate 40, a right box plate 41, a front box plate 42 and a rear box plate 43 which are enclosed into a cuboid shape, the flue gas inlet pipe 37 and the mixed gas outlet pipe 39 are horizontally arranged along the left-right direction, the central lines of the gas gathering gas mixing cover 36, the flue gas inlet pipe 37 and the mixed gas outlet pipe 39 are superposed, the left end of the flue gas inlet pipe 37 extends out of the middle part of the left box plate 40 and is connected with an air outlet of a fifth flue gas pipeline 15, the right end of the flue gas inlet pipe 37 is fixedly and hermetically connected with the left side wall of the right box plate 41, and air outlets of the two air inlet pipes are respectively connected with the middle parts of the front box plate 42 and the rear box plate 43, the air inlets of the two air inlet pipes 39 are connected with the air outlet of the second air pipeline 16, a front partition plate 47 and a rear partition plate 48 are arranged in the air mixing box, the interior of the air mixing box is sequentially divided into a front cavity 44, a mixing cavity 45 and a rear cavity 46 from front to back, the front partition plate 47 is positioned on the front side of the flue gas inlet pipe 37, the rear partition plate 48 is positioned on the rear side of the flue gas inlet pipe 37, the left end of the mixed gas outlet pipe 39 is fixedly and hermetically connected with the right side wall of the right box plate 41, the appearance of the gas collecting and mixing cover 36 is in a conical structure with the thick left side and the thin right side, the left side of the gas collecting and mixing cover 36 is fixedly connected with the left box plate 40, and the right end edge of the gas collecting and mixing cover 36 is fixedly connected with the outer wall of the mixed gas outlet pipe 39;
evenly set up a plurality of flue gas inlet 49 that is located the gas mixing incasement along the circumferencial direction on the flue gas intake pipe 37, a plurality of air inlet 50 has all been seted up on preceding baffle 47 and the back baffle 48, set up a plurality of on the right side board with the hybrid chamber 45 with gather the inside gas mixture venthole 51 that communicates of gas mixing cover 36, set up on the gas mixture outlet duct 39 and be located the inside gas mixture exhaust hole 52 of gathering gas mixing cover 36, the gas outlet of gas mixture outlet duct 39 is connected with the air inlet of first hybrid tube 17.
The smoke and oxygen secondary mixer 8 comprises an air injection pipe 53 which is arranged in the same axial direction, a transition pipe 54, a jet flow pipe 55 and a mixed divergent pipe 56, an air inlet of the air injection pipe 53 is connected with an air outlet of the second mixing pipeline 18, an air outlet of the air injection pipe 53 is connected with an air inlet of the jet flow pipe 55, an air outlet of the jet flow pipe 55 is connected with an air inlet of the transition pipe 54, an air outlet of the transition pipe 54 is connected with an air inlet of the mixed divergent pipe 56, an air outlet of the mixed divergent pipe 56 is connected with an air inlet of the mixed gas air supply pipe 20, the jet flow pipe 55 is of a conical cylinder structure with an air inlet larger than an air outlet, the jet flow pipe 55 is of a conical cylinder structure with an air outlet larger than an air inlet, a drainage pipe is connected on the transition cylinder, one side of the air inlet end of the drainage pipe is adjacent to the jet flow pipe 55, and the air inlet of the drainage pipe is connected with an air outlet of the third air pipeline 19.
The sulfur removal device 4 comprises a sulfur removal box 58, a suction pump 59, a liquid suction pipe 60 and a spray plate 61, wherein a pore plate 62 which divides the interior of the sulfur removal box 58 into an upper spray chamber and a lower liquid storage chamber is horizontally arranged in the sulfur removal box 58, the spray plate 61 is of a hollow structure, the spray plate 61 is horizontally arranged on the inner wall of the top of the sulfur removal box 58, the spray plate 61 is of a hollow structure, a plurality of spray heads 63 are uniformly arranged on the lower surface of the spray plate 61, at least three upper baffles 64 are vertically arranged on the lower surface of the spray plate 61, at least three lower baffles 65 are vertically arranged on the upper surface of the pore plate 62, the front side and the rear side of each of the upper baffles 64 and the lower baffles 65 are respectively and fixedly connected with the inner wall of the front side and the inner wall of the rear side of the sulfur removal box 58, the upper baffles 64 and the lower baffles 65 are uniformly arranged at intervals, gaps are respectively arranged between the upper baffles 64 and the pore plate 62 and between the lower baffles 65 and the spray plate 61, and the left side and the right side of the sulfur removal box 58 are respectively connected with the gas outlet of the second flue gas pipeline 12 and the third flue gas pipeline 13;
the inside of the liquid storage chamber of the sulfur removal tank 58 is filled with alkaline solution, the suction pump 59 is positioned at the left side of the sulfur removal tank 58, the inlet of the suction pump 59 is connected with a suction pipe 66 extending into the upper part of the alkaline solution, the outlet of the suction pump 59 is connected with the inlet of the liquid suction pipe 60, the upper part of the liquid suction pipe 60 is arranged at the top of the sulfur removal tank 58 in parallel, and the liquid suction pipe 60 is communicated with the inside of the spray plate 61 through a plurality of liquid distribution pipes;
a lower liquid level meter 69 positioned at the upper part of the suction pipe 66 and an upper liquid level meter 67 positioned on the lower surface of the pore plate 62 are arranged in the liquid storage chamber of the sulfur removal tank 58, an alkaline solution adding port 68 is formed in the lower part of the right side of the sulfur removal tank 58, and a blocking plate is arranged at the alkaline solution adding port 68;
a guide plate 70 is arranged in the liquid storage chamber of the sulfur removal tank 58, the guide plate 70 is positioned above the suction pipe 66, the guide plate 70 is obliquely arranged in a left-high-right manner, and the edges of the left side, the front side and the rear side of the guide plate 70 are fixedly connected with the inner walls of the left side, the front side and the rear side of the sulfur removal tank 58 respectively.
The quick lime dryer 5 comprises a drying box 71, the upper portion of the drying box 71 is of a rectangular pyramid structure with a small top and a large bottom, the lower portion of the drying box 71 is of a rectangular pyramid structure with a large top and a small bottom, an upper layer rail 72 and a lower layer rail 73 are arranged in the drying box 71 in the left-right horizontal direction, an upper frame 74 and a lower frame 75 are arranged in the upper layer rail 72 in a sliding mode, quick lime balls 76 are arranged in the upper frame 74 and the lower frame 75 through mesh bags, openings for horizontally drawing the upper frame 74 and the lower frame 75 are formed in the right side of the drying box 71, and sealing plates 77 are arranged at the openings.
A booster fan 78 positioned at the outlet side of the quicklime dryer 5 is arranged on the fifth flue gas pipeline 15.
The spiral fin tube 87 is composed of a spiral fin tube body 88 and fins 89, the spiral fin tube body 88 and the fins 89 are integrally formed by a metal material through a hot rolling technology, and the spiral fin tube 87 with a uniform pitch is formed through multiple rolling, the cross section of the fins 89 is trapezoidal, and the fins 89 form a spiral line shape in the axial direction of the spiral fin tube body 88.
The device also comprises a pressurizing water spraying device 90 for enhancing the circulating flow speed of cooling water in the spiral finned tube 87;
the pressurized water spraying device 90 comprises a first mounting frame 91, a second mounting frame 92, two water supply pumps 93 and two water supply pipes 94, wherein the first mounting frame 91 and the second mounting frame 92 are arranged at the bottom in the lower boiler barrel 83, the two water supply pipes 94 extend into the lower boiler barrel 83 from the rear end of the lower boiler barrel 83 in the direction parallel to the central line of the lower boiler barrel 83, the two water supply pipes 94 are respectively installed on the first mounting frame 91 and the second mounting frame 92 through U-shaped bolts 95, gaskets and nuts 100, the front ends of the water supply pipes 94 are plugged, the rear end of each water supply pipe 94 is correspondingly connected with a water outlet of one water supply pump 93, a control valve 96 located outside the boiler body 9 is respectively arranged on each water supply pipe 94, the two water supply pipes 94 are communicated through a plurality of connecting pipes 97, a plurality of spraying pipes 98 are connected to one water supply pipe 94 in the length direction, a spraying opening of each spraying pipe 98 corresponds to a lower end opening of one spiral fin pipe 87, the distance between the spraying opening of each spraying pipe 98 and the lower end opening of the spiral fin pipe 87 is 2-4mm, and the inner diameter of each spraying pipe 98 is 3-5mm.
The spiral fin tubes 87 are arranged in a mode that the direction from the burner mounting hole 80 to the hearth smoke outlet 99 is gradually changed from density to density, and the spiral fin tubes 87 and the water tubes of the water-cooling membrane type wall 81 are arranged in a staggered mode at intervals.
The invention adopts two measures to reduce the generation of nitrogen oxides: firstly, the internal temperature of the hearth 79 is reduced; and the second method is to mix the discharged flue gas with air to reduce the oxygen content in the air and supply air to the hearth 79 in a circulating manner.
The first measure, namely the specific principle and technical measure for reducing the combustion temperature of the hearth 79, is as follows:
in order to fully utilize the limited space of the hearth 79, the arranged water-cooled tubes adopt spiral fin tubes 87, the spiral fin tubes 87 are formed by integral hot rolling, the heat absorption area of the flame side is increased, in order to not influence the heat absorption of the water-cooled membrane wall 81, the outer edge of the arranged spiral fin tubes 87 is at least larger than the diameter of a water tube of the membrane wall from the membrane wall, the spiral fin tubes 87 and the water tubes of the water-cooled membrane wall 81 are arranged at intervals in a staggered mode, the number of the spiral fin tubes 87 is preferably reduced to lower the temperature in the hearth 79 to below 950 ℃, the temperature can well control the generation of nitrogen oxides, meanwhile, a superheater 85 can be arranged at a hearth smoke outlet 99, the problem that the tube explosion is caused by too large heat load of the superheater 85 and the difference of heat absorption capacity of superheated steam is avoided, the radiation space in the hearth 79 is fully utilized, the volume of the hearth and the volume of the hearth are not increased, and the weight of an upper boiler tube bank 82 and the integral volume of a convection tube bank 82 and a lower boiler are reduced when the same boiler temperature is maintained.
The method for specifically increasing the boiler extension water-cooled hearth 79 comprises the following steps: the invention is characterized in that water cooling tubes are additionally arranged at the positions, close to the water cooling membrane walls 81, of the water cooling membrane walls 81 on the periphery of the hearth 79 to form an inner radiating tube hearth 79, the hearth 79 and the original water cooling membrane walls 81 form a composite water cooling structure, the inner water cooling tubes can be composed of light tubes or fins 89, the integral spiral fin tube 87 is preferentially adopted, the spiral fin tube 87 is manufactured into the spiral fin tube 87 through a hot rolling technology and is rolled for multiple times, the spiral fin tube 88 and the fins 89 are integrally formed, the fins 89 and the spiral fin tube 88 are not welded and are made of the same material, the cross section of the fin 89 is trapezoidal, the fins 89 form a spiral line shape in the axial direction of the spiral fin tube 88, and the structure is beneficial to heat diffusion and disturbance in smoke heat transfer, so that the heat transfer coefficient of the spiral fin tube 87 is very high, the heat transfer area per unit length is large, and the heating area can be doubled by arranging fewer spiral fin tube bodies 88 in a limited space. Because the oil-fired boiler is provided with the arrangement structure of the upper boiler barrel 82 and the lower boiler barrel 83, the spiral fin tube 87 can be directly penetrated between the upper boiler barrel 82 and the lower boiler barrel 83, the insertion structure is adopted, the upper end part and the lower end part of the upper boiler barrel 82 and the lower boiler barrel 83 penetrate through the boiler barrel walls and extend into the boiler barrel, thus the two ends of the upper boiler barrel 82 and the lower boiler barrel 83 can be ensured to be deeply buried in water when the boiler operates, the safe heat exchange of the upper boiler barrel 82 and the lower boiler barrel 83 during radiation heat exchange is ensured, the spiral fin tube 87 is connected with the boiler barrel in a sealing welding mode in the boiler barrel, the length of the spiral fin tube 87 extending into the boiler barrel is preferably not more than 10mm, the distance from the outer edge of the spiral fin tube 87 arranged inside the hearth 79 to the membrane wall of the hearth 79 is at least larger than the pipe diameter of a water pipe of one membrane wall, the number of the spiral fin tubes 87 is proper for reducing the temperature in the boiler hearth 79 to be below 950 degrees (the temperature can meet the requirements of radiation heat exchange and reduce the generation of oxynitride on one hand), meanwhile, the strength requirement of the boiler barrel is met, after the requirements are met, the spiral fin tubes 87 of the inner hearth 79 are arranged as much as possible, in order not to influence the combustion temperature of fuel, the arrangement number of the spiral fin tubes 87 near the burner mounting hole 80 is properly reduced, and when the spiral fin tubes 87 on the inner side of the water-cooling membrane wall 81 are mounted, the spiral fin tubes are assembled in place before the water-cooling membrane wall 81.
Because the heat transfer in the furnace 79 belongs to radiation heat transfer, the heat intensity is high, in order to increase the safety of water circulation, a pressurizing water spraying device 90 is arranged at the lower end opening of the spiral fin tube 87 of the inner-layer furnace 79, a control valve 96 is arranged on a water supply pipe 94, the control valve 96 is kept fully open in the operation process, the resistance of water spraying is controlled by the size of a water spraying opening, the control valve 96 is closed when the boiler is stopped, an injection pipe 98 is arranged on the water supply pipe 94, a spraying opening of the injection pipe 98 corresponds to the lower end opening of the spiral fin tube 87, the spraying opening of the injection pipe 98 is kept at about 3mm from the lower end opening of the spiral fin tube 87 better, the size of the spraying opening of the injection pipe 98 is generally kept at 3-5mm better, high-pressure water (the flow rate of about 5 m/s) sprayed from the spraying opening of the injection pipe 98 is enabled to provide compensation for possible insufficient water circulation power of the spiral fin tube 87, and high reliability of the water circulation of the spiral fin tube 87 is ensured, and the temperature in the furnace 79 is further easily reduced. In addition, the two water supply pumps 93 and the two water supply pipes 94 are adopted in the invention, and the two water supply pipes 94 are connected through the plurality of connecting pipes 97, so that the flow speed of water sprayed by the spraying pipes 98 can be greatly enhanced, and when one water supply pump 93 breaks down or overhauls, the other water supply pump can continue to work, so that the operation of pressurizing water is carried out continuously, and the temperature in the hearth 79 is ensured not to fluctuate greatly.
After adopting compound water-cooled furnace 79, if the boiler has over heater 85, can directly arrange over heater 85 in the export of furnace 79, need not arrange convection bank 84 at the export of furnace 79 in advance according to original arrangement mode, then arrange over heater 85 again, made things convenient for installation and inspection of over heater 85, to same boiler outlet flue gas temperature, can be less arrange convection bank 84, reduce the volume of boiler, reduce the whole steel consumption of boiler, do not reduce the wholeness ability of boiler.
The second measure, namely the specific measure for reducing the emission of nitrogen oxides by reducing the oxygen content of the boiler combustion, is that the specific air supply flow of the air with lower oxygen content required in the boiler burner 21 is as follows: high-temperature flue gas generated in a boiler body 9 enters an air preheater 1 through a first flue gas pipeline 10 to exchange heat with air preheated by the air preheater 1, the heat-exchanged flue gas enters a sulfur removal device 4 through a second flue gas pipeline 12 to be sprayed and subjected to sulfur removal, then the flue gas enters a static pressure box, most of the flue gas is discharged through a discharge pipe 33 at the bottom of a lower housing 31, the discharge speed can be adjusted through a discharge valve 34, a small amount of flue gas enters a quicklime dryer 5 through a fourth flue gas pipeline 14 to adsorb water vapor in the flue gas, and the dried flue gas enters a flue gas inlet pipe 37 in a flue gas-oxygen primary mixer 6 through a fifth flue gas pipeline 15; simultaneously, preheated air enters the air static pressure box 3, most of the air enters the primary smoke-oxygen mixer 6 from a second air pipeline 16 and two air inlet pipes 38, smoke and air in the primary smoke-oxygen mixer 6 are uniformly mixed and then mixed gas is sent into the secondary smoke-oxygen mixer 8 from a blower 7 through a second mixing pipeline 18, when the oxygen content of the mixed gas is detected to be less by a first oxygen content sensor 25, an air secondary mixing adjusting valve 24 is opened, the air enters the secondary smoke-oxygen mixer 8 from a third air pipeline 19 and a drainage pipe to be mixed again, and after the oxygen content in the mixed gas is detected to meet the specified requirement by a second oxygen content sensor 27, the opening degree of the air secondary mixing adjusting valve 24 is fixed; qualified mixed gas is finally supplied to a burner at the front part of a hearth 79 of the boiler body 9 through the mixed gas supply pipe 20. In fig. 1, the single-row arrows indicate the air flow direction, the double-row arrows indicate the flue gas flow direction, and the three-row arrows indicate the mixed gas flow direction.
The principle and the function of the sulfur removal device 4 are as follows: because the flue gas discharged from the boiler body 9 contains a large amount of SO 2 The invention adopts a spraying sulfur removal mode, the flue gas enters from the left side of the sulfur removal box 58, sequentially passes through a baffling channel formed between an upper baffle 64 and a lower baffle 65 and then is discharged from the right side of the sulfur removal box 58, meanwhile, an alkaline solution enters into a spraying plate 61 through a suction pipe 66, a liquid suction pipe 60 and a liquid dividing pipe by a suction pump 59, the alkaline solution is uniformly sprayed downwards into a spraying chamber by a spray head 63, the flue gas in the baffling channel is sprayed, and meanwhile, the alkaline solution and SO are sprayed into the spraying chamber 2 Carrying out chemical reaction, and adding SO 2 The spray water is removed and falls into the liquid storage chamber through the orifice plate 62 to be recycled through precipitation. Because the suction tube 66 is located the left side of stock solution room, consequently set up guide plate 70 in the top of suction tube 66, make the left solution that contains impurity of orifice plate 62 along guide plate 70 right, deposit on the stock solution room right side, can make the clean solution after the suction tube 66 extraction sediment filters like this, avoid blockking up shower nozzle 63. When the liquid level of the alkaline solution is too high or too low, the lower liquid level gauge 69 and the upper liquid level gauge 67 send out alarms to remind workers to treat the alkaline solution, and the situation that the suction pump 59 is damaged after the solution cannot be pumped is avoided. When the alkaline solution is decreased, the alkaline solution is added through the alkaline solution addition port.
The specific principle and the function of the flue gas static pressure box 2 are as follows: the main gas component in the desulfurized flue gas is CO 2 And also unburned CO gas, which is compared with CO 2 Lighter, naturally, the gas will float upwards into the upper cover shell 30 and be discharged into the quicklime dryer 5 through the fourth flue gas pipeline 14, so that the combustible body in the flue gas can be pumped back into the hearth 79 again for repeated combustion and utilization, the energy consumption is reduced, the pollution is reduced, and heavier CO is generated 2 Is discharged from the discharge pipe 33 by sinking into the lower casing 31; the smoke gas emission pipe 28 is horizontally arranged in the middle of the cylinder 29, and the gas emission hole 32 is arranged in the smoke gas emission pipeThe lower part of the dispersion pipe 28 can ensure that the flue gas uniformly sinks in the cylinder 29, and the lighter CO gas floats upwards to achieve good CO and CO 2 The separation effect of (4).
The specific principle and the function of the primary smoke-oxygen mixer 6 are as follows: the flue gas inlet pipe 37 of the primary flue gas-oxygen mixer 6 is communicated with the middle part of the mixing cavity 45 and is uniformly dispersed into the mixing cavity 45 through a flue gas inlet hole 49, two air inlet pipes 38 are uniformly distributed through air inlet holes 50 on a front partition plate 47 and a rear partition plate 48 and then enter the mixing cavity 45 to be mixed with the flue gas, the mixed gas enters the gas-gathering gas mixing cover 36 through a mixed gas exhaust hole 52 on a right side plate, the gas-gathering gas mixing cover 36 is in a conical structure with a thick left side and a thin right side, the cross section of the mixed gas is gradually reduced when the mixed gas moves from left to right in the gas-gathering cover, the mixed gas is further fully mixed, and the mixed gas which is uniformly fully mixed finally enters the mixed gas outlet pipe 39 through the mixed gas exhaust hole 52 to be discharged. The edge of the right end of the gas-gathering gas-mixing cover 36 is fixedly connected with the outer wall of the gas-mixing outlet pipe 39, so that the strength of the gas-mixing outlet pipe of the mixer is enhanced.
The secondary mixer 8 for flue gas and oxygen adopts the venturi effect principle, on the premise that the blower 7 provides high air pressure, when the mixed gas firstly passes through the flow cross section of the jet pipe 55, the flow velocity of the fluid increases, then when the flow velocity of the air flow passes through the mixing and diverging pipe 56, the flow cross section gradually increases, according to the principle that the flow velocity is in inverse proportion to the flow cross section and the increase of the flow velocity known by bernoulli's law, the pressure of the fluid decreases, namely the common venturi effect, the effect means that low pressure can be generated near the high-velocity flowing fluid, so that the transition pipe 54 generates adsorption, the air is adsorbed into the mixed gas and mixed again, and the oxygen concentration in the mixed gas can reach the specified requirement.
The sulfur removal operation is carried out by adopting the spraying alkaline solution, so that the flue gas contains more water vapor, and the water vapor in the flue gas needs to be removed. In addition, when the quicklime ball 76 absorbs moisture and reaches saturation, the sealing plate 77 can be opened, the upper frame 74 and the lower frame 75 can be drawn out, the quicklime ball 76 in the net bag can be replaced, and the operation is convenient. The upper portion of drying cabinet 71 is big end down's rectangular pyramid type structure, and the lower part of drying cabinet 71 is big end down's rectangular pyramid type structure, and this structure can make the flue gas when passing through quick lime ball 76, and gas equipartition nature is stronger.
Because the gas pressure can reduce a lot after the flue gas passes through quick lime dryer 5, therefore be provided with the booster fan 78 that is located quick lime dryer 5 gas outlet side on fifth flue gas pipeline 15, mix for the cigarette oxygen and provide power once.
The present embodiment is not intended to limit the shape, material, structure, etc. of the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims (8)

1. Fuel boiler that abundant reduction nitrogen oxide produced, including the boiler body, the inside right side of boiler body is furnace, the combustor mounting hole has been seted up on the anterior right side of boiler body, install the boiler combustor in the combustor mounting hole, furnace inner wall all around is provided with water-cooling membrane type wall, boiler body left side is provided with a boiler section of thick bamboo and a lower boiler section of thick bamboo, go up boiler section of thick bamboo and lower between the boiler section of thick bamboo through convection bank intercommunication, furnace outlet flue sets up at left water-cooling membrane type wall rear portion, at last boiler section of thick bamboo and be located furnace outlet flue department and be provided with the over heater between the boiler section of thick bamboo under and, boiler body left side front portion is provided with boiler outlet flue, its characterized in that: the inner sides of water-cooled membrane type walls around the hearth are uniformly provided with a plurality of spiral fin tubes, the water-cooled membrane type walls surround an outer hearth, the spiral fin tubes surround an inner hearth, the water-cooled membrane type walls and the spiral fin tubes form a composite water-cooled hearth in the hearth, each spiral fin tube is arranged between the upper boiler barrel and the lower boiler barrel in the vertical direction, the distance between each spiral fin tube and the water-cooled membrane type wall is larger than the diameter of the water tube of the water-cooled membrane type wall, the upper ends of all the spiral fin tubes extend into the upper boiler barrel, the lower ends of all the spiral fin tubes extend into the lower boiler barrel, and the length of the spiral fin tubes extending into the upper boiler barrel and the lower boiler barrel is not more than 10mm; when the boiler is installed, the spiral fin tube is assembled in place before the water-cooled membrane wall, and the spiral fin tube and the water-cooled membrane wall perform composite water cooling on the hearth, so that the smoke temperature at a smoke outlet of the hearth is controlled below 950 ℃;
the boiler smoke outlet is connected with the boiler burner through a smoke treatment mixing system; the flue gas treatment mixing system comprises an air preheater, a flue gas static pressure box, an air static pressure box, a sulfur removal device, a quick lime dryer, a smoke and oxygen primary mixer, a blower and a smoke and oxygen secondary mixer;
the boiler smoke outlet is connected with a high-temperature gas inlet of an air preheater through a first smoke pipeline, an air outlet of the air preheater is connected with an air inlet of an air static pressure box through a first air pipeline, a low-temperature gas outlet of the air preheater is connected with an air inlet of a sulfur removal device through a second smoke pipeline, an air outlet of the sulfur removal device is connected with the middle of the smoke static pressure box through a third smoke pipeline, the top of the smoke static pressure box is connected with an air inlet of a quicklime drier through a fourth smoke pipeline, an air outlet of the quicklime drier is connected with a smoke inlet of a smoke-oxygen primary mixer through a fifth smoke pipeline, the air static pressure box is connected with an air inlet of the smoke-oxygen primary mixer through a second air pipeline, the smoke-oxygen primary mixer is connected with an air inlet of a blower through a first mixing pipeline, an air outlet of the blower is connected with a mixed gas inlet of a smoke-oxygen secondary mixer through a second mixing pipeline, an air inlet of the smoke-oxygen secondary mixer is connected with the air box through a third air pipeline, a mixed gas outlet of the smoke-oxygen secondary mixer is connected with a mixed gas supply pipe, and an air supply pipe of the mixed gas static pressure outlet is connected with an air supply pipe of a burner;
a smoke regulating valve is arranged on the fifth smoke pipeline, an air secondary mixing regulating valve is arranged on the third air pipeline, a first oxygen content sensor is arranged on the second mixing pipeline, a mixed gas regulating valve and a second oxygen content sensor are arranged on the mixed gas supply pipe, and the second oxygen content sensor is positioned between the mixed gas regulating valve and the smoke and oxygen secondary mixer;
the spiral finned tube is composed of a spiral finned tube body and fins, wherein the spiral finned tube body and the fins are integrally formed by a metal material through a hot rolling technology and are rolled for multiple times to form the spiral finned tube with equal pitch, the cross section of each fin is trapezoidal, and the fins form a spiral line shape in the axial direction of the spiral finned tube body;
the spiral finned tubes are arranged in a mode that the direction from the burner mounting hole to the smoke outlet of the hearth gradually changes from density to density and then to density, and the spiral finned tubes and the water tubes of the water-cooling membrane type wall are arranged at intervals in a staggered mode.
2. The oil fired boiler for substantially reducing the generation of nitrogen oxides as set forth in claim 1, wherein: the smoke static pressure box comprises a smoke divergence tube and a barrel body in a cuboid structure, the upper end and the lower end of the barrel body are both open, the top of the barrel body is provided with an upper cover shell with a sharp upper end and a wide lower end and a square conical shape, the bottom of the barrel body is provided with a lower cover shell with a sharp lower end and a wide upper end and a square conical shape, the smoke divergence tube is horizontally arranged in the middle of the barrel body, the gas outlet of the smoke divergence tube is fixedly connected with the inner wall of the barrel body and is blocked, the gas inlet of the smoke divergence tube extends out of the barrel body and is connected with the gas outlet of a third smoke pipeline, and the lower part of the smoke divergence tube in the barrel body is uniformly provided with air dispersion holes along the length direction; the inner walls of the cylinder body, the upper housing and the lower housing are coated with anti-corrosion heat-insulation layers, the top of the upper housing is connected with an inlet of a fourth flue gas pipeline, the bottom of the lower housing is connected with a discharge pipe, and a discharge valve is arranged on the discharge pipe.
3. The oil fired boiler for substantially reducing the generation of nitrogen oxides as set forth in claim 1, wherein: the primary flue gas-oxygen mixer comprises a gas mixing box, a gas gathering gas mixing cover, a flue gas inlet pipe, two air inlet pipes and a mixed gas outlet pipe, wherein the gas mixing box is formed by an upper box plate, a lower box plate, a left box plate, a right box plate, a front box plate and a rear box plate which are enclosed into a cuboid shape;
evenly set up a plurality of flue gas inlet hole that is located the gas mixing incasement along the circumferencial direction in the flue gas intake pipe, all seted up a plurality of air inlet hole on preceding baffle and the back baffle, set up the gas mixture venthole that a plurality of will mixing chamber and gather the inside intercommunication of gas mixing cover on the right side board, set up on the gas mixture outlet duct and be located the inside gas mixture exhaust hole of gathering gas mixing cover, the gas outlet of gas mixture outlet duct is connected with the air inlet of first hybrid tube.
4. The oil fired boiler for substantially reducing the generation of nitrogen oxides as set forth in claim 1, wherein: the smoke and oxygen secondary mixer includes the jet-propelled pipe that sets up with the axial, the transition pipe, jet-propelled pipe and mixed divergent pipe, the air inlet of jet-propelled pipe is connected with the gas outlet of second hybrid piping, the gas outlet of jet-propelled pipe is connected with the air inlet of jet-propelled pipe, the gas outlet of jet-propelled pipe is connected with the air inlet of transition pipe, the gas outlet of transition pipe is connected with the air inlet of mixed divergent pipe, the gas outlet of mixed divergent pipe is connected with the air inlet of gas mixture air supply pipe, jet-propelled pipe is the circular cone section of thick bamboo structure that the air inlet is greater than the gas outlet, jet-propelled pipe is the circular cone section of thick bamboo structure that the gas outlet is greater than the air inlet, be connected with the drainage tube on the transition section of thick bamboo, the neighbouring jet-propelled pipe one side of air inlet end of drainage tube, the air inlet and the gas outlet of third air duct of drainage tube are connected.
5. The oil fired boiler for substantially reducing the generation of nitrogen oxides as set forth in claim 1, wherein: the desulfurization device comprises a desulfurization tank, a suction pump, a liquid suction pipe and a spray plate, wherein a pore plate which divides the interior of the desulfurization tank into an upper spray chamber and a lower liquid storage chamber is horizontally arranged in the desulfurization tank, the spray plate is horizontally arranged on the inner wall of the top of the desulfurization tank, the spray plate is of a hollow structure, a plurality of spray heads are uniformly arranged on the lower surface of the spray plate, at least three upper baffles are arranged on the lower surface of the spray plate along the vertical direction, at least three lower baffles are arranged on the upper surface of the pore plate along the vertical direction, the front side and the rear side of each upper baffle and each lower baffle are respectively and fixedly connected with the inner wall of the front side and the inner wall of the rear side of the desulfurization tank, the upper baffles and the lower baffles are uniformly arranged at intervals, gaps are respectively arranged between each upper baffle and the pore plate and between each lower baffle and the spray plate, and the left side and the right side of the desulfurization tank are respectively connected with the gas outlet of a second flue gas pipeline and the gas inlet of a third flue gas pipeline;
the sulfur removal box is characterized in that an alkaline solution is contained in a liquid storage chamber of the sulfur removal box, a suction pump is positioned on the left side of the sulfur removal box, an inlet of the suction pump is connected with a suction pipe extending into the upper part of the alkaline solution, an outlet of the suction pump is connected with an inlet of a liquid suction pipe, the upper part of the liquid suction pipe is arranged on the top of the sulfur removal box in parallel, and the liquid suction pipe is communicated with the inside of the spraying plate through a plurality of liquid distribution pipes;
a lower liquid level meter positioned at the upper part of the suction pipe and an upper liquid level meter positioned on the lower surface of the pore plate are arranged in a liquid storage chamber of the sulfur removal tank, an alkaline solution adding port is formed in the lower part of the right side of the sulfur removal tank, and a blocking plate is arranged at the alkaline solution adding port;
the inside of the liquid storage chamber of the sulfur removal tank is provided with a guide plate, the guide plate is positioned above the suction pipe and is obliquely arranged in a left-high-right direction, and the edges of the left side, the front side and the rear side of the guide plate are fixedly connected with the inner walls of the left side, the front side and the rear side of the sulfur removal tank respectively.
6. The oil fired boiler for substantially reducing the generation of nitrogen oxides as set forth in claim 1, wherein: quick lime desicator includes the drying cabinet, the upper portion of drying cabinet is big-end-up's rectangular pyramid type structure, the lower part of drying cabinet is big-end-up's rectangular pyramid type structure, horizontal direction is provided with upper track and lower floor's track about along in the drying cabinet, it is provided with frame and underframe to slide in the upper track, all be equipped with quick lime ball through the pocket in upper frame and the underframe, the opening that is used for horizontal pull upper frame and underframe is seted up on the right side of drying cabinet, the opening part is provided with the closing plate.
7. The oil fired boiler for substantially reducing the generation of nitrogen oxides as set forth in claim 1, wherein: and a booster fan positioned on the air outlet side of the quicklime dryer is arranged on the fifth flue gas pipeline.
8. The oil boiler substantially reducing generation of nitrogen oxides as claimed in claim 1, wherein: the device also comprises a pressurizing water spraying device for enhancing the circulating flow speed of cooling water in the spiral fin tube;
the pressurized water spraying device comprises a first mounting frame, a second mounting frame, two water feeding pumps and two water supplying pipes, wherein the first mounting frame and the second mounting frame are arranged at the bottom in a lower boiler barrel, the two water supplying pipes extend into the lower boiler barrel from the rear end of the lower boiler barrel along the direction parallel to the central line of the lower boiler barrel, the two water supplying pipes are respectively mounted on the first mounting frame and the second mounting frame through U-shaped bolts, gaskets and nuts, the front ends of the water supplying pipes are plugged, the rear end of each water supplying pipe corresponds to a water outlet of one water feeding pump and is connected with a control valve outside a boiler body, the two water supplying pipes are respectively provided with one control valve, the two water supplying pipes are communicated through a plurality of connecting pipes, one water supplying pipe is connected with a plurality of spraying pipes along the length direction, a spraying opening of each spraying pipe corresponds to a lower end opening of one spiral fin pipe, the distance between the spraying opening of each spraying fin pipe and the lower end opening of the spiral fin pipe is 2-4mm, and the inner diameter of the spraying opening of each spraying pipe is 3-5mm.
CN201710453879.9A 2017-06-15 2017-06-15 Oil-fired boiler capable of sufficiently reducing nitrogen oxide Active CN107120631B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN105020730A (en) * 2015-07-28 2015-11-04 陈玉 Environment-friendly energy saver of gas-fired boiler
CN205448274U (en) * 2016-02-17 2016-08-10 北京葆蓝科技有限公司 Full premix hangs down nitrogen fine copper boiler with oxygen sensor
CN206944111U (en) * 2017-06-15 2018-01-30 董磊 It is substantially reduced oil burning boiler caused by nitrogen oxides

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5178453B2 (en) * 2008-10-27 2013-04-10 株式会社日立製作所 Oxyfuel boiler and control method for oxygen fired boiler

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN105020730A (en) * 2015-07-28 2015-11-04 陈玉 Environment-friendly energy saver of gas-fired boiler
CN205448274U (en) * 2016-02-17 2016-08-10 北京葆蓝科技有限公司 Full premix hangs down nitrogen fine copper boiler with oxygen sensor
CN206944111U (en) * 2017-06-15 2018-01-30 董磊 It is substantially reduced oil burning boiler caused by nitrogen oxides

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