EP1219894B1 - Pulverized coal burner - Google Patents
Pulverized coal burner Download PDFInfo
- Publication number
- EP1219894B1 EP1219894B1 EP02006379A EP02006379A EP1219894B1 EP 1219894 B1 EP1219894 B1 EP 1219894B1 EP 02006379 A EP02006379 A EP 02006379A EP 02006379 A EP02006379 A EP 02006379A EP 1219894 B1 EP1219894 B1 EP 1219894B1
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- EP
- European Patent Office
- Prior art keywords
- fuel
- air
- furnace
- burner
- pulverized fuel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
- F23C5/32—Disposition of burners to obtain rotating flames, i.e. flames moving helically or spirally
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
- F23D2201/10—Nozzle tips
- F23D2201/101—Nozzle tips tiltable
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
- F23D2201/20—Fuel flow guiding devices
Definitions
- the present invention relates to a pulverized fuel burning boiler for generating a steam for a power plant, a factory and the like and to a method of operating such burner.
- Reference numeral 01 denotes a boiler furnace main body, and a plurality of burner main bodies 02 are disposed in a vertical direction at each of four corners therein.
- the burner main body 02 is constituted by a combustion air nozzle 03, an auxiliary air nozzle 04, a pulverized coal mixture nozzle 05, etc. and a pulverized coal mixture 10, a combustion air 11, a main burner air 12 and an additional air 13 are supplied thereto through a pulverized coal mixture feeding pipe 06, an air feeding duct 07, a main burner air duct 08 and an additional air duct 09.
- Reference numeral 14 denotes an additional air nozzle disposed at an upper position
- reference numeral 15 denotes a furnace
- a pulverized coal flame 16 is formed in the furnace 15.
- Reference numeral 17 denotes an air adjusting damper assembled in each of the burner main bodies 02
- reference numeral 18 denotes an imaginary circle imagined in the furnace 15 for explanation purpose
- reference numeral 19 denotes a fire vortex formed in the furnace 15.
- a coal fed to a coal pulverizing apparatus (not shown) is finely pulverized, is mixed with a carrying air (a hot air) simultaneously fed so as to form the pulverized coal mixture 10, and is fed to the pulverized coal mixture nozzle 05 provided in the burner main body 02 through the pulverized coal mixture feeding pipe 06.
- the burner main bodies 02 are provided at four corners of the boiler furnace main body 01, and plural sets of burners, each burner comprising the combustion air nozzle 03, the pulverized coal mixture nozzle 05 provided in a center portion thereof and the auxiliary air nozzle 04 provided above and below the combustion air nozzle 03, are installed within each of the burner main bodies 02. (Here, there is a case that the burner main bodies 02 are provided not only at four corners of the boiler furnace main body 01, but also on a wall surface as shown in Fig. 7.)
- Each set of these nozzles that is, the combustion air nozzle 03. the auxiliary air nozzle 04 and the pulverized coal mixture nozzle 05, is installed in such a manner as to blow the pulverized coal mixture 10 and the main burner air 12 in a tangential direction of an imaginary circle 18 which is set at a center portion on a horizontal cross section of the boiler furnace main body 01.
- a construction drawing of the conventional pulverized coal mixture nozzle 05 will be shown in Fig. 8.
- the additional air nozzles 14 are provided at four corners above the burner main bodies 02 in the boiler furnace main body 01.
- the additional air nozzle 14 is installed in such a manner as to blow the additional air 13 in a tangential direction of an imaginary circle 18 which has a same diameter as that of the imaginary circle 18 with respect to the respective nozzles 03, 04 and 05 of the burner main body 02 and is set at a center portion on a horizontal cross section of the boiler furnace main body 01.
- the pulverized coal mixture 10 supplied to the pulverized coal mixture nozzle 05 provided in the burner main body 02 is blown into the furnace 15 from the nozzle 05.
- the combustion air 11 is fed through the air feeding duct 07 by a feeding apparatus (not shown), and is branched into the main burner air 12 and the additional air 13 before entering the burner main body 02.
- the main burner air 12 is fed to the burner main body 02 through the main burner air duct 08, and is blown into the furnace 15 from the combustion air nozzle 03 and the auxiliary air nozzle 04.
- An amount of the main burner air 12 is generally set to be equal to or less than a stoichiometric mixture ratio of an amount of the pulverized coal blown as the pulverized coal mixture 10 so as to hold a portion of the furnace 15 below the additional air nozzle 14 in a reducing atmosphere, thereby reducing a nitrogen oxide (hereinafter referred to as to N0x for short) generated by burning the pulverized coal.
- N0x nitrogen oxide
- the main burner air 12 and the branched additional air 13 are fed to the additional air nozzle 14, and blown into the furnace 15 so as to be used for completing a burning of a combustible portion left in the combustion gas due to the reduction combustion.
- the pulverized coal mixture 10 blown into the furnace 15 from the four corners of the boiler furnace main body 01 is ignited by an ignition source (not shown), and forms the pulverized coal flame 16.
- the pulverized coal flame 16 becomes a swirling flow so as to form the fire vortex 19, and ascend in the furnace 15 with swirling, thereby performing a swirling combustion.
- the amount of the main burner air 12 blown from the burner main body 02 is equal to or less than the stoichiometric mixture ratio of the amount of the pulverized coal blown as the pulverized coal mixture 10 from the pulverized coal mixture nozzle 05, so that the portion of the furnace 15 below the additional air nozzle 14 portion becomes a reducing atmosphere.
- a combustion exhaust gas generated by burning the pulverized coal becomes to contain a combustible portion, however, N0x in the combustion exhaust gas generated by burning the pulverized coal is reduced so that an intermediate product such as NH3 and HCN is generated in place thereof.
- the combustion exhaust gas containing the combustible portion is blown with the additional air 13 in the additional air nozzle 14 portion, and the combustion thereof is completed till an outlet of the furnace.
- the conventional pulverized coal burner Since a blowing momentum of the pulverized coal mixture 10 blown from the pulverized coal mixture nozzle 05 becomes large when a capacity of the burner becomes large, a degree of collision of the pulverized coal flame 16 with side wall of the furnace 15 is increased, and in addition thereto, it becomes difficult to secure a stable ignitability. As a result, the conventional pulverized coal burner has a disadvantage that it is hard to increase the capacity.
- the increase of the number of the burners is performed by increasing a number of stages of the burners since the number of the burners on the horizontal cross section of the boiler furnace main body 01 is fixed, however, in this manner, a height of the boiler is increased, so that a cost for constructing the boiler is increased.
- US 5 315 939 A discloses a pulverized fuel burning boiler on which the preamble portion of claim 1 is based.
- individual offset air compartments are positioned immediately above the associated fuel compartments. Rectangular bars are provided at the exit of the fuel nozzle portions and serve to create turbulences in the pulverized solid fuel and primary air at the exit from the fuel nozzle portions to thereby create eddies with a higher flame propagation speed. This serves to permit the ignition points to be closer to the exit of the fuel nozzle portions and to increase the mixing of air and fuel.
- An object of the invention is to solve the problem in the prior art that the entire furnace is heightened and the cost is increased, accompanying with a trial to provide the additional air port in the upper portion of the furnace so as to disperse the amount of air to reduce the amount of air in the burner windbox portion for reducing the value of N0x, and the problem that the thermal load of the burner portion becomes high and the slag (molten ash) is increasingly attached to the wall of the furnace so as to cause an obstruction in heat transmission and combustion, accompanying with a trial to reduce the height of the burner so as to restrict the height of the entire furnace, thereby providing a preferable burner portion having a high practicality.
- the invention provides a pulverized fuel burning boiler as defined by claim 1 and a method of operating such boiler as defined by claim 5.
- the boiler comprising a burner having an increased width and a reduced height so as to effect in a high thermal load combustion of fuel in a narrow area, a separately provided additional air port disposed above the burner, a twist plate disposed within a pulverized fuel pipe for biasing a pulverized fuel to an inner side of the furnace and a combustion secondary air injection port for increasing an amount of air close to a furnace wall side by increasing an opening area close to the furnace wall side.
- the height of the burner is reduced in correspondence that the width of the burner is increased, thereby performing a high thermal load combustion for burning the fuel at the narrow area
- the separately provided additional air port is arranged above the burner so as to reduce a generation of N0x in the burner portion
- the twist plate disposed within the pulverized fuel pipe biases the pulverized fuel to the inner side of the furnace
- the opening area of the combustion secondary air injection port is increased in the portion close to the wall side of the furnace so as to increase the amount of the air close to the wall side of the furnace. Therefore, a melting point of the slag (the molten ash) is increased and the molten slag is prevented from attaching to the furnace wall in the high thermal load.
- reference numerals 101 to 119 correspond to the reference numerals 01 to 19 in the conventional structure, a description will be simplified as much as possible, and an ignition promoting air hole 120 provided in a pulverized coal mixture nozzle 105, an ignition promoting air chamber 121, an ignition promoting air chamber inlet port 122, a guiding plate 123, a rich/lean separating body 124, etc. will be described in detail.
- a coal fed to a coal pulverizing apparatus (not shown) is pulverized there, is mixed with a carrying air (a hot air) simultaneously fed so as to form a pulverized coal mixture 110, and is fed to a pulverized coal mixture nozzle 105 provided in a burner main body 102 through a pulverized coal mixture transporting pipe 106.
- the pulverized coal mixture nozzle 105 is constituted by a pulverized coal mixture pipe connected to the pulverized coal mixture transporting pipe 106, and a mixture injecting nozzle attached to a front end thereof.
- the rich/lean separating body 124 is provided within the pulverized coal mixture pipe near an inlet of the mixture injecting nozzle.
- An injecting port of the mixture injecting nozzle is branched into upper and lower directions with an optional angle, for example, an angle of 10 degrees to 30 degrees in one direction with respect to a horizontal axis, and the ignition promoting air chamber 121 is provided between the upper and lower injecting ports.
- the combustion air nozzle 103 is provided on an outer periphery of the mixture injecting nozzle, and blows the main burner air 112 into the furnace 114 from a blowing port constituted by the mixture injecting nozzle and the combustion air nozzle 103.
- the pulverized coal mixture 110 fed to the pulverized coal mixture nozzle 105 flows in a biased manner at the pulverized coal mixture pipe outlet portion by the rich/lean separating body 124.
- the pulverized coal mixture 110 is structured such that a concentration of the pulverized coal becomes lean on the rich/lean separating body 124 attaching side at the mixture injecting nozzle outlet port due to a force of inertia and a concentration of the pulverized coal on the opposite side not attaching the same becomes rich.
- a blowing port of the main burner air 112 formed by the mixture injecting nozzle and the combustion air nozzle 103 is formed wider on the lean pulverized coal side of the pulverized coal mixture 110 and narrower on the rich pulverized coal side.
- a portion, blown into a central side of the fire vortex 119, of the pulverized coal mixture 110 injected from the mixture injecting nozzle becomes to an upstream side of the swirling combustion flow, so that said portion is in a state of easily igniting having a large radiant heat from the adjacent pulverized coal flame 116.
- the pulverized coal mixture 110 is set such that the rich pulverized coal side is blown to the central side of the fire vortex 119.
- a new device is further added to the mixture injecting nozzle in order to improve an ignition stability of the pulverized coal flame 116.
- the mixture injecting nozzle is structured such that the injecting port thereof is branched to the upper and lower directions with an optional angle, the ignition promoting air chamber 121 is provided between the upper and lower injecting ports, and the guiding plate 123 and the ignition promoting air chamber inlet hole 122 are provided in the inlet of said air chamber 121.
- the ignition promoting air chamber 121 is formed by disposing a plate on a side facing to the furnace 115, and the ignition promoting air hole 120 is bored on the plate so as to blow the main burner air 112, which has flown to the ignition promoting air chamber 121 through the ignition promoting air chamber inlet hole 122, between two pulverized coal mixtures 110 injected from the mixture injecting nozzle.
- the main burner air 112 blown from the ignition promoting air hole 120 prevents flows of the pulverized coal mixture 110 blown from two injection ports of the mixture injecting nozzle from joining together earlier, and since a temperature of the main burner air 112 is high to be about 300 °C in comparison to a temperature of the pulverized coal mixture 110 which is generally 100 °C or less (in many cases, about 80 °C), an effect that a generation of a volatile matter between the pulverized coal mixtures 110 is promoted can be obtained, so that an igniting stability of the pulverized coal flame 116 can be secured.
- Fig. 4(a) shows a cross section of a boiler
- Fig. 4(b) shows a burner windbox arranged at each of four corners of Fig. 4(a) and a separately provided additional air port arranged above the burner windbox
- Fig. 4(c) shows a front of one of fuel nozzles of Fig. 4(b)
- Fig. 4(d) shows a pulverized fuel pipe for supplying a fuel to the fuel nozzle of Fig. 4(c).
- reference numeral 301 denotes a cross section of a furnace, a periphery of which is surrounded by a wall of the furnace in a square shape, and a burner windbox 302 is arranged at each of four corners thereof.
- Reference numeral 303 denotes a flame and reference numeral 304 denotes a section close to the furnace wall.
- Fig. 4(b) shows a detail of the burner windbox 302 structured in five stages. That is auxiliary air portions 305b and 305a are arranged at upper and lower ends, a first stage fuel nozzle portion 306a is placed on the lower end auxiliary air portion 305a, a second stage fuel nozzle portion 306b is placed thereon via an oil nozzle portion 307a, and a third stage fuel nozzle portion 306c, a fourth stage fuel nozzle portion 306d and a fifth stage fuel nozzle portion 306e are likewise placed via an oil nozzle portion 307b, an oil nozzle portion 307c and an oil nozzle portion 307d, respectively, up to the upper end auxiliary air portion 305b overlappedly with no gap being placed between each of them.
- the fifth stage fuel nozzle portion 306e is constituted by a fuel injecting port 308, disposed in a central portion, for injecting a pulverized fuel and a carrying air, and a combustion secondary air injecting port 309, surrounding a periphery thereof, for injecting a secondary air.
- the other fuel nozzle portions 306a to 306d are also constituted in the same manner as that of the fifth stage fuel nozzle portion 306e. Further, the pulverized fuel and the carrying air to be injected from the fuel injecting port 308 are carried through the pulverized fuel pipe 310 shown in Fig. 4(d) and reach the fuel injecting port 308.
- the furnace cross section 301 the periphery of which is surrounded by the furnace wall in a square shape, is provided with the burner windbox 302 at each of four corners, however, the first to fifth stage fuel nozzle portions 306a to 306e, which constitute a main portion of the burner disposed here, and the respective oil nozzle portions 307a to 307d disposed therebetween are structured with an elongated horizontal width and a reduced height.
- the horizontal width is made to be 1 to 1.5 times the height, however, in this embodiment, the shape is formed such that the horizontal width is made to be about three times the height, and the height is reduced corresponding to the horizontal width, so elongated, so that the total height of the five stages is made lower.
- an additional air port 314 is provided above the burner windbox 302 constructed in five stages overlappedly, and the position of the additional air port 314 is set to be substantially same as the height at which the uppermost element of the conventional general fuel nozzle portions is arranged.
- the hatched fifth stage fuel nozzle portion 306e in the overlapped body is structured such that the front shape is constituted, as shown in Fig. 4(c), by the fuel injecting port 308, arranged on the inner side, for injecting the pulverized fuel and the carrying air, and the combustion secondary air injecting port 309, surrounding the fuel injecting port 308, for injecting the secondary air, however, the fuel injecting port 308 on the inner side is biased rightward as seen in the drawing in the fuel secondary air injecting port 309, surrounding the fuel injecting port 308.
- the structure is such that an opening portion of the fuel secondary air injecting port 309 is broader in a portion close to the furnace wall and a portion close to the center is narrower by that degree, so that the combustion secondary air is injected more to the portion close to the furnace wall by increasing an air flow area in the portion close to the furnace wall, and a lean fuel flame 311 is formed within the section 304 close to the furnace wall on the furnace wall side of the flame 303 around the center.
- a block 313 is disposed at a portion at which a flow of the pulverized fuel and the carrying air curves, so that the pulverized fuel etc. is biased outwardly of the curved portion above the block by a centrifugal force and then, by use of a twist plate 312 which is arranged so as to twist a flow 90 degrees, the rich pulverized fuel etc. is biased to the inner side of the furnace and the concentration thereof in the portion close to the furnace wall is reduced.
- the pulverized fuel flows with an increased area for receiving a radiation heat from the flame so as to promote the ignition by expanding the width of the so-called burner portion comprising the first to fifth stage fuel nozzle portions 306a to 306e and by reducing the height of the burner, and a combustion is done in a narrow area, thereby elevating an atmospheric temperature and improving a combustibility.
- the additional air port 314 installed separately from the burner portion is provided at the height position substantially corresponding to the uppermost stage of the conventional general burners and a sufficient amount of air corresponding to about 30 to 40 % of all the combustion air is supplied there, thereby making the burner portion a reducing area with a shortage of air, and further, reduction of the height of the entire burner portion secures a residence time for the pulverized fuel and the combustion gas moving from the burner portion to the additional air port 314, so that the N0x reducing area is further strengthened in addition to the promotion of ignition and the increase of the atmospheric temperature.
- twist plate 312 and the block 313 disposed inside the pulverized fuel pipe 310 first bias the pulverized fuel within the cross section of the pulverized fuel pipe 310 by a centrifugal force due to the block 313 and the curve of the pulverized fuel pipe 310, and next the twist plate 312 twists the pulverized fuel in the rich area to be injected to the inner side of the furnace, and reduces the pulverized fuel amount near the furnace wall, so that amount of ash content is reduced also.
- a compound having a low melting temperature is formed in a state that the peripheral atmosphere is short of air and a bonding force is increased, so that an air amount close to the furnace wall where the opening area is broad is increased, and such component is prevented from occurring with the sufficient air.
- the burner is structured such as to have an increased width and a reduced height so as to burn a fuel at a narrow area to effect a high thermal load combustion, an separately provided additional air port disposed above the burner, a twist plate disposed within a pulverized fuel pipe for biasing the pulverized fuel to an inner side of the furnace and a combustion secondary air injection port for increasing an amount of air close to the furnace wall side by increasing an opening area close to the furnace wall side, thereby the height of the entire burner is reduced so that a high thermal load combustion for burning the fuel at the narrow area is effected and the combustion air is consumed in the separately provided additional air port arranged above the burner,so that the combustion air is throttled in the burner portion so as to reduce a generation of N0x, and further the twist plate biases the pulverized fuel flowing within the pulverized fuel pipe to the inner side of the furnace, and the combustion secondary air injection port having the opening area enlarged in the portion close to the furnace wall increases the amount
- the pulverized coal burner in which the height of the burner is restricted, the manufacturing cost is reduced, the generation of NOx in the burner portion is reduced, the burning performance is promoted by the high thermal load combustion so as to reduce the unburned component, and the molten ash is easily taken off from the furnace wall, can be obtained, so that the apparatus having a practicality, a suitability and a high reliability can be obtained.
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Description
- The present invention relates to a pulverized fuel burning boiler for generating a steam for a power plant, a factory and the like and to a method of operating such burner.
- A conventional boiler of this kind will be described below with reference to Figs. 5 to 8.
-
Reference numeral 01 denotes a boiler furnace main body, and a plurality of burnermain bodies 02 are disposed in a vertical direction at each of four corners therein. The burnermain body 02 is constituted by acombustion air nozzle 03, anauxiliary air nozzle 04, a pulverizedcoal mixture nozzle 05, etc. and a pulverizedcoal mixture 10, acombustion air 11, amain burner air 12 and anadditional air 13 are supplied thereto through a pulverized coalmixture feeding pipe 06, anair feeding duct 07, a mainburner air duct 08 and anadditional air duct 09. -
Reference numeral 14 denotes an additional air nozzle disposed at an upper position,reference numeral 15 denotes a furnace, and a pulverizedcoal flame 16 is formed in thefurnace 15.Reference numeral 17 denotes an air adjusting damper assembled in each of the burnermain bodies 02,reference numeral 18 denotes an imaginary circle imagined in thefurnace 15 for explanation purpose, andreference numeral 19 denotes a fire vortex formed in thefurnace 15. - In the conventional pulverized coal burning boiler provided with the means mentioned above, a coal fed to a coal pulverizing apparatus (not shown) is finely pulverized, is mixed with a carrying air (a hot air) simultaneously fed so as to form the pulverized
coal mixture 10, and is fed to the pulverizedcoal mixture nozzle 05 provided in the burnermain body 02 through the pulverized coalmixture feeding pipe 06. - The burner
main bodies 02 are provided at four corners of the boiler furnacemain body 01, and plural sets of burners, each burner comprising thecombustion air nozzle 03, the pulverizedcoal mixture nozzle 05 provided in a center portion thereof and theauxiliary air nozzle 04 provided above and below thecombustion air nozzle 03, are installed within each of the burnermain bodies 02. (Here, there is a case that the burnermain bodies 02 are provided not only at four corners of the boiler furnacemain body 01, but also on a wall surface as shown in Fig. 7.) - Each set of these nozzles, that is, the
combustion air nozzle 03. theauxiliary air nozzle 04 and the pulverizedcoal mixture nozzle 05, is installed in such a manner as to blow the pulverizedcoal mixture 10 and themain burner air 12 in a tangential direction of animaginary circle 18 which is set at a center portion on a horizontal cross section of the boiler furnacemain body 01. A construction drawing of the conventional pulverizedcoal mixture nozzle 05 will be shown in Fig. 8. - The
additional air nozzles 14 are provided at four corners above the burnermain bodies 02 in the boiler furnacemain body 01. Theadditional air nozzle 14 is installed in such a manner as to blow theadditional air 13 in a tangential direction of animaginary circle 18 which has a same diameter as that of theimaginary circle 18 with respect to therespective nozzles main body 02 and is set at a center portion on a horizontal cross section of the boiler furnacemain body 01. - The pulverized
coal mixture 10 supplied to the pulverizedcoal mixture nozzle 05 provided in the burnermain body 02 is blown into thefurnace 15 from thenozzle 05. On the other hand, thecombustion air 11 is fed through theair feeding duct 07 by a feeding apparatus (not shown), and is branched into themain burner air 12 and theadditional air 13 before entering the burnermain body 02. - The
main burner air 12 is fed to the burnermain body 02 through the mainburner air duct 08, and is blown into thefurnace 15 from thecombustion air nozzle 03 and theauxiliary air nozzle 04. - An amount of the
main burner air 12 is generally set to be equal to or less than a stoichiometric mixture ratio of an amount of the pulverized coal blown as the pulverizedcoal mixture 10 so as to hold a portion of thefurnace 15 below theadditional air nozzle 14 in a reducing atmosphere, thereby reducing a nitrogen oxide (hereinafter referred to as to N0x for short) generated by burning the pulverized coal. - The
main burner air 12 and the branchedadditional air 13 are fed to theadditional air nozzle 14, and blown into thefurnace 15 so as to be used for completing a burning of a combustible portion left in the combustion gas due to the reduction combustion. - The pulverized
coal mixture 10 blown into thefurnace 15 from the four corners of the boiler furnacemain body 01 is ignited by an ignition source (not shown), and forms the pulverizedcoal flame 16. The pulverizedcoal flame 16 becomes a swirling flow so as to form thefire vortex 19, and ascend in thefurnace 15 with swirling, thereby performing a swirling combustion. - As mentioned above, the amount of the
main burner air 12 blown from the burnermain body 02 is equal to or less than the stoichiometric mixture ratio of the amount of the pulverized coal blown as the pulverizedcoal mixture 10 from the pulverizedcoal mixture nozzle 05, so that the portion of thefurnace 15 below theadditional air nozzle 14 portion becomes a reducing atmosphere. - Accordingly, a combustion exhaust gas generated by burning the pulverized coal becomes to contain a combustible portion, however, N0x in the combustion exhaust gas generated by burning the pulverized coal is reduced so that an intermediate product such as NH3 and HCN is generated in place thereof.
- In the reduction of NOx in this reducing area, it is important to efficiently diffuse and mix the
main burner air 12 and the pulverizedcoal mixture 10 so as to burn, and the more completely an oxygen supplied by themain burner air 12 is consumed, the higher a rate of NOx reduction becomes. - The combustion exhaust gas containing the combustible portion is blown with the
additional air 13 in theadditional air nozzle 14 portion, and the combustion thereof is completed till an outlet of the furnace. - In the conventional pulverized coal combustion mentioned above, in the case that a diameter of the
imaginary circle 18 set in the center portion on the horizontal cross section of the boiler furnacemain body 01 is excessively small, the pulverizedcoal flames 16 collide with each other, so that a formation of thefire vortex 19 becomes insufficient and the combustion is deteriorated. On the contrary, in the case that the diameter of theimaginary circle 18 is excessively large, the pulverizedcoal flames 16 collide with a side wall of thefurnace 15 so that a phenomenon that a slagging occurs violently and a combustion is deteriorated is generated. - Accordingly, a determination of the diameter of the
imaginary circle 18 has so far been carefully performed by taking actual results into consideration. Nevertheless, a negative pressure is generated between the side wall of thefurnace 15 and the pulverizedcoal flame 16 by themain burner air 12 blown at a high speed, so that thefire vortex 19 formed by the pulverizedcoal flames 16 becomes a hollow doughnut-shaped fire vortex 19 having a diameter significantly larger than the diameter of theimaginary circle 18 and flows in thefurnace 15 due to a so-called Coanda effect in which the pulverizedcoal flame 16 is drawn near the side wall. Therefore, the slagging occurs violently. - Since a blowing momentum of the pulverized
coal mixture 10 blown from the pulverizedcoal mixture nozzle 05 becomes large when a capacity of the burner becomes large, a degree of collision of the pulverizedcoal flame 16 with side wall of thefurnace 15 is increased, and in addition thereto, it becomes difficult to secure a stable ignitability. As a result, the conventional pulverized coal burner has a disadvantage that it is hard to increase the capacity. - In the case of intending to increase the capacity of the boiler, an combustion rate is necessarily increased, however, in order to deal with this, it is necessary (1) to increase a number of the burners attached to the boiler and (2) to increase the capacity of each of the burners.
- Among them, the increase of the number of the burners is performed by increasing a number of stages of the burners since the number of the burners on the horizontal cross section of the boiler furnace
main body 01 is fixed, however, in this manner, a height of the boiler is increased, so that a cost for constructing the boiler is increased. - Accordingly, in order to increase the capacity, of the boiler, it is necessary to increase the capacity of each of the burners, however, when the combustion forming the
fire vortex 19 is performed by the conventional burner, the blowing momentum of the pulverizedcoal mixture 10 blown from the pulverizedcoal mixture nozzle 05 is increased, together with an increase of the capacity of the burner, so that a degree of collision of the pulverizedcoal flame 16 with the side wall of thefurnace 15 is increased. Therefore, there are problems that an amount of slagging is increased and it becomes difficult to secure the stability of ignition of the pulverizedcoal flame 16. - US 5 315 939 A discloses a pulverized fuel burning boiler on which the preamble portion of
claim 1 is based. In this know boiler individual offset air compartments are positioned immediately above the associated fuel compartments. Rectangular bars are provided at the exit of the fuel nozzle portions and serve to create turbulences in the pulverized solid fuel and primary air at the exit from the fuel nozzle portions to thereby create eddies with a higher flame propagation speed. This serves to permit the ignition points to be closer to the exit of the fuel nozzle portions and to increase the mixing of air and fuel. - An object of the invention is to solve the problem in the prior art that the the entire furnace is heightened and the cost is increased, accompanying with a trial to provide the additional air port in the upper portion of the furnace so as to disperse the amount of air to reduce the amount of air in the burner windbox portion for reducing the value of N0x, and the problem that the thermal load of the burner portion becomes high and the slag (molten ash) is increasingly attached to the wall of the furnace so as to cause an obstruction in heat transmission and combustion, accompanying with a trial to reduce the height of the burner so as to restrict the height of the entire furnace, thereby providing a preferable burner portion having a high practicality.
- Further, the invention provides a pulverized fuel burning boiler as defined by
claim 1 and a method of operating such boiler as defined by claim 5. The boiler comprising a burner having an increased width and a reduced height so as to effect in a high thermal load combustion of fuel in a narrow area, a separately provided additional air port disposed above the burner, a twist plate disposed within a pulverized fuel pipe for biasing a pulverized fuel to an inner side of the furnace and a combustion secondary air injection port for increasing an amount of air close to a furnace wall side by increasing an opening area close to the furnace wall side. Accordingly, the height of the burner is reduced in correspondence that the width of the burner is increased, thereby performing a high thermal load combustion for burning the fuel at the narrow area, the separately provided additional air port is arranged above the burner so as to reduce a generation of N0x in the burner portion, the twist plate disposed within the pulverized fuel pipe biases the pulverized fuel to the inner side of the furnace, and the opening area of the combustion secondary air injection port is increased in the portion close to the wall side of the furnace so as to increase the amount of the air close to the wall side of the furnace. Therefore, a melting point of the slag (the molten ash) is increased and the molten slag is prevented from attaching to the furnace wall in the high thermal load. -
- Fig. 1 is an explanatory view as seen from a cross section along a line I-I in Fig. 2, which, shows a system of a boiler;
- Fig. 2 is a cross sectional view along a line II-II in Fig. 1, which shows a horizontal cross section of the boiler in Fig. 1;
- Figs. 3(a), 3(b) and 3(c) show a summary of a pulverized coal mixture nozzle in the boiler shown in Figs. 1 and 2. in which Fig. 3(a) is a schematic view showing a cross section along a line a-a in Fig. 3(b), Fig. 3(b) is a schematic view showing a cross section along a line b-b in Fig. 3(a) and Fig. 3(c) is a schematic view showing a cross section along a line c-c in Fig. 3(a);
- Figs. 4(a), 4(b), 4(c) and 4(d) show a summary of a pulverized coal burner in accordance with an embodiment of the invention, in which Fig. 4(a) is a schematic view showing a cross section of a boiler. Fig. 4(b) is a schematic view showing a burner windbox arranged at four corners of Fig. 4(a) and a separately provided additional port arranged above the burner windbox, Fig. 4(c) is a schematic view showing a front surface of one of fuel nozzles of Fig. 4(b) and Fig. 4(d) is a schematic view showing a pulverized fuel pipe for supplying a fuel to a fuel nozzle of Fig. 4(c);
- Fig. 5 is a schematic view as seen from a cross section along a line VI-VI in Fig. 6, which shows a system of a conventional boiler;
- Fig. 6 is a cross sectional view along a line VII-VII of a boiler shown in Fig. 5;
- Figs. 7(a), 7(b), 7(c) and 7(d) are schematic views which respectively show different aspects of an arrangement of a burner in the conventional boiler; and
- Figs. 8(a) and 8(b) show a pulverized coal mixture nozzle in the conventional boiler, in which Fig. 8(a) is a cross sectional view and Fig. 8(b) is a cross sectional view along a line B-B of fig. 8(a).
- A pulverized fuel burning boiler similar to the invention will be described below with reference to Figs. 1 to 3. In this case, in correspondence to the conventional ones mentioned above, reference numerals obtained by adding 100 to the reference numerals in the conventional ones will be attached to the same parts so that a mutual relation can be easily understood, and an overlapping description will be omitted as much as possible.
- Accordingly, since
reference numerals 101 to 119 correspond to thereference numerals 01 to 19 in the conventional structure, a description will be simplified as much as possible, and an ignition promotingair hole 120 provided in a pulverizedcoal mixture nozzle 105, an ignition promotingair chamber 121, an ignition promoting airchamber inlet port 122, a guidingplate 123, a rich/leanseparating body 124, etc. will be described in detail. - A coal fed to a coal pulverizing apparatus (not shown) is pulverized there, is mixed with a carrying air (a hot air) simultaneously fed so as to form a pulverized
coal mixture 110, and is fed to a pulverizedcoal mixture nozzle 105 provided in a burnermain body 102 through a pulverized coalmixture transporting pipe 106. - The pulverized
coal mixture nozzle 105 is constituted by a pulverized coal mixture pipe connected to the pulverized coalmixture transporting pipe 106, and a mixture injecting nozzle attached to a front end thereof. The rich/lean separating body 124 is provided within the pulverized coal mixture pipe near an inlet of the mixture injecting nozzle. - An injecting port of the mixture injecting nozzle is branched into upper and lower directions with an optional angle, for example, an angle of 10 degrees to 30 degrees in one direction with respect to a horizontal axis, and the ignition promoting
air chamber 121 is provided between the upper and lower injecting ports. - The
combustion air nozzle 103 is provided on an outer periphery of the mixture injecting nozzle, and blows themain burner air 112 into thefurnace 114 from a blowing port constituted by the mixture injecting nozzle and thecombustion air nozzle 103. - The pulverized
coal mixture 110 fed to the pulverizedcoal mixture nozzle 105 flows in a biased manner at the pulverized coal mixture pipe outlet portion by the rich/lean separating body 124. As a result, the pulverizedcoal mixture 110 is structured such that a concentration of the pulverized coal becomes lean on the rich/lean separating body 124 attaching side at the mixture injecting nozzle outlet port due to a force of inertia and a concentration of the pulverized coal on the opposite side not attaching the same becomes rich. - A blowing port of the
main burner air 112 formed by the mixture injecting nozzle and thecombustion air nozzle 103 is formed wider on the lean pulverized coal side of the pulverizedcoal mixture 110 and narrower on the rich pulverized coal side. - In a swirling combustion performed by forming the
fire vortex 119 in a center portion of thefurnace 115, a portion, blown into a central side of thefire vortex 119, of the pulverizedcoal mixture 110 injected from the mixture injecting nozzle becomes to an upstream side of the swirling combustion flow, so that said portion is in a state of easily igniting having a large radiant heat from the adjacent pulverizedcoal flame 116. Accordingly, the pulverizedcoal mixture 110 is set such that the rich pulverized coal side is blown to the central side of thefire vortex 119. - In the
main burner air 112 blown from themain burner air 112 blowing port formed by the mixture injecting nozzle and thecombustion air nozzle 103. since an area of themain burner air 112 blowing port is set such that a blowing amount to the central side of thefire vortex 119 becomes less and a blowing amount to the outer peripheral side (a wall surface side of the furnace) of thefire vortex 119 becomes more, the pulverizedcoal flame 116 is prevented from colliding with the wall surface of thefurnace 115, thereby restricting a generation of slagging and unburned component. - In addition to the structure mentioned above, in accordance with this embodiment, a new device is further added to the mixture injecting nozzle in order to improve an ignition stability of the pulverized
coal flame 116. - That is, as mentioned above, the mixture injecting nozzle is structured such that the injecting port thereof is branched to the upper and lower directions with an optional angle, the ignition promoting
air chamber 121 is provided between the upper and lower injecting ports, and the guidingplate 123 and the ignition promoting airchamber inlet hole 122 are provided in the inlet of saidair chamber 121. - The ignition promoting
air chamber 121 is formed by disposing a plate on a side facing to thefurnace 115, and the ignition promotingair hole 120 is bored on the plate so as to blow themain burner air 112, which has flown to the ignition promotingair chamber 121 through the ignition promoting airchamber inlet hole 122, between two pulverizedcoal mixtures 110 injected from the mixture injecting nozzle. - The
main burner air 112 blown from the ignition promotingair hole 120 prevents flows of the pulverizedcoal mixture 110 blown from two injection ports of the mixture injecting nozzle from joining together earlier, and since a temperature of themain burner air 112 is high to be about 300 °C in comparison to a temperature of the pulverizedcoal mixture 110 which is generally 100 °C or less (in many cases, about 80 °C), an effect that a generation of a volatile matter between the pulverizedcoal mixtures 110 is promoted can be obtained, so that an igniting stability of the pulverizedcoal flame 116 can be secured. - An embodiment in accordance with the invention will be described below with reference to Fig. 4. In this case, Fig. 4(a) shows a cross section of a boiler, Fig. 4(b) shows a burner windbox arranged at each of four corners of Fig. 4(a) and a separately provided additional air port arranged above the burner windbox, Fig. 4(c) shows a front of one of fuel nozzles of Fig. 4(b) and Fig. 4(d) shows a pulverized fuel pipe for supplying a fuel to the fuel nozzle of Fig. 4(c).
- In Fig. 4(a),
reference numeral 301 denotes a cross section of a furnace, a periphery of which is surrounded by a wall of the furnace in a square shape, and aburner windbox 302 is arranged at each of four corners thereof.Reference numeral 303 denotes a flame andreference numeral 304 denotes a section close to the furnace wall. - Fig. 4(b) shows a detail of the
burner windbox 302 structured in five stages. That isauxiliary air portions fuel nozzle portion 306a is placed on the lower endauxiliary air portion 305a, a second stagefuel nozzle portion 306b is placed thereon via anoil nozzle portion 307a, and a third stagefuel nozzle portion 306c, a fourth stagefuel nozzle portion 306d and a fifth stagefuel nozzle portion 306e are likewise placed via anoil nozzle portion 307b, anoil nozzle portion 307c and anoil nozzle portion 307d, respectively, up to the upper endauxiliary air portion 305b overlappedly with no gap being placed between each of them. - Then, among the elements in this overlapped body, paying attention to the hatched fifth stage
fuel nozzle portion 306e, the front shape thereof is shown in Fig. 4(c). Then, the fifth stagefuel nozzle portion 306e is constituted by afuel injecting port 308, disposed in a central portion, for injecting a pulverized fuel and a carrying air, and a combustion secondaryair injecting port 309, surrounding a periphery thereof, for injecting a secondary air. - As a matter of course, the other
fuel nozzle portions 306a to 306d are also constituted in the same manner as that of the fifth stagefuel nozzle portion 306e. Further, the pulverized fuel and the carrying air to be injected from thefuel injecting port 308 are carried through the pulverizedfuel pipe 310 shown in Fig. 4(d) and reach thefuel injecting port 308. - It is to be noted that a basic construction part has been described above, however, as will be understood from the description in Fig. 4, various kinds of devices are further added to the invention. That is, the
furnace cross section 301, the periphery of which is surrounded by the furnace wall in a square shape, is provided with theburner windbox 302 at each of four corners, however, the first to fifth stagefuel nozzle portions 306a to 306e, which constitute a main portion of the burner disposed here, and the respectiveoil nozzle portions 307a to 307d disposed therebetween are structured with an elongated horizontal width and a reduced height. - For example, in the conventional general fuel nozzle portion, the horizontal width is made to be 1 to 1.5 times the height, however, in this embodiment, the shape is formed such that the horizontal width is made to be about three times the height, and the height is reduced corresponding to the horizontal width, so elongated, so that the total height of the five stages is made lower.
- Then, an
additional air port 314 is provided above theburner windbox 302 constructed in five stages overlappedly, and the position of theadditional air port 314 is set to be substantially same as the height at which the uppermost element of the conventional general fuel nozzle portions is arranged. - Further, the hatched fifth stage
fuel nozzle portion 306e in the overlapped body is structured such that the front shape is constituted, as shown in Fig. 4(c), by thefuel injecting port 308, arranged on the inner side, for injecting the pulverized fuel and the carrying air, and the combustion secondaryair injecting port 309, surrounding thefuel injecting port 308, for injecting the secondary air, however, thefuel injecting port 308 on the inner side is biased rightward as seen in the drawing in the fuel secondaryair injecting port 309, surrounding thefuel injecting port 308. - That is, the structure is such that an opening portion of the fuel secondary
air injecting port 309 is broader in a portion close to the furnace wall and a portion close to the center is narrower by that degree, so that the combustion secondary air is injected more to the portion close to the furnace wall by increasing an air flow area in the portion close to the furnace wall, and alean fuel flame 311 is formed within thesection 304 close to the furnace wall on the furnace wall side of theflame 303 around the center. - Further, in the interior of the pulverized
fuel pipe 310 for supplying the pulverized fuel and the carrying air to thefuel injecting port 308, ablock 313 is disposed at a portion at which a flow of the pulverized fuel and the carrying air curves, so that the pulverized fuel etc. is biased outwardly of the curved portion above the block by a centrifugal force and then, by use of atwist plate 312 which is arranged so as to twist a flow 90 degrees, the rich pulverized fuel etc. is biased to the inner side of the furnace and the concentration thereof in the portion close to the furnace wall is reduced. - Since the embodiment is structured in the manner mentioned above, the pulverized fuel flows with an increased area for receiving a radiation heat from the flame so as to promote the ignition by expanding the width of the so-called burner portion comprising the first to fifth stage
fuel nozzle portions 306a to 306e and by reducing the height of the burner, and a combustion is done in a narrow area, thereby elevating an atmospheric temperature and improving a combustibility. - Further, the
additional air port 314 installed separately from the burner portion is provided at the height position substantially corresponding to the uppermost stage of the conventional general burners and a sufficient amount of air corresponding to about 30 to 40 % of all the combustion air is supplied there, thereby making the burner portion a reducing area with a shortage of air, and further, reduction of the height of the entire burner portion secures a residence time for the pulverized fuel and the combustion gas moving from the burner portion to theadditional air port 314, so that the N0x reducing area is further strengthened in addition to the promotion of ignition and the increase of the atmospheric temperature. - Further, the
twist plate 312 and theblock 313 disposed inside the pulverizedfuel pipe 310 first bias the pulverized fuel within the cross section of the pulverizedfuel pipe 310 by a centrifugal force due to theblock 313 and the curve of the pulverizedfuel pipe 310, and next thetwist plate 312 twists the pulverized fuel in the rich area to be injected to the inner side of the furnace, and reduces the pulverized fuel amount near the furnace wall, so that amount of ash content is reduced also. - Still further, in case that an iron is contained in the ash, a compound having a low melting temperature is formed in a state that the peripheral atmosphere is short of air and a bonding force is increased, so that an air amount close to the furnace wall where the opening area is broad is increased, and such component is prevented from occurring with the sufficient air.
- In accordance with the invention as recited in Claim 1, the burner is structured such as to have an increased width and a reduced height so as to burn a fuel at a narrow area to effect a high thermal load combustion, an separately provided additional air port disposed above the burner, a twist plate disposed within a pulverized fuel pipe for biasing the pulverized fuel to an inner side of the furnace and a combustion secondary air injection port for increasing an amount of air close to the furnace wall side by increasing an opening area close to the furnace wall side, thereby the height of the entire burner is reduced so that a high thermal load combustion for burning the fuel at the narrow area is effected and the combustion air is consumed in the separately provided additional air port arranged above the burner,so that the combustion air is throttled in the burner portion so as to reduce a generation of N0x, and further the twist plate biases the pulverized fuel flowing within the pulverized fuel pipe to the inner side of the furnace, and the combustion secondary air injection port having the opening area enlarged in the portion close to the furnace wall increases the amount of the air close to the wall side of the furnace, thus, a melting point of the slag (the molten ash) is increased and the molten ash is prevented from attaching to the furnace wall in the high thermal load.
- Accordingly, the pulverized coal burner in which the height of the burner is restricted, the manufacturing cost is reduced, the generation of NOx in the burner portion is reduced, the burning performance is promoted by the high thermal load combustion so as to reduce the unburned component, and the molten ash is easily taken off from the furnace wall, can be obtained, so that the apparatus having a practicality, a suitability and a high reliability can be obtained.
Claims (5)
- A pulverized fuel burning boiler comprising a furnace and a pulverized fuel burner (302) for supplying a pulverized fuel mixture into the furnace where it is to be burned in a flame (303), wherein
said burner (302) comprises a plurality of fuel nozzle portions (306a-e) which have a horizontally elongated shape and are arranged above each other;
each fuel nozzle portion (306a-e) comprises a fuel injection port (308) and a combustion secondary air injection port (309) surrounding the fuel injection port (308);
a pulverized fuel pipe (310) is provided for supplying pulverized fuel and carrying air to the fuel injection port (308) of the respective fuel nozzle portion (306a-e); and
an additional air port (314) is separately provided above said burner (302);
characterized in that
the opening portion of said combustion secondary air injection port (309) is broader in a portion close to the furnace wall than in a portion close to the center of the furnace; and
a twist plate (312) is disposed within said pulverized fuel pipe (310) for twisting the flow of pulverized fuel and carrying air in order to bias the pulverized fuel to an inner side of said furnace. - The pulverized fuel burning boiler as recited in claim 1, wherein a block (313) is disposed within said pulverized fuel pipe (310) upstream of said twist plate (312) at a portion where a flow of the pulverized fuel and carrying air is curved, for biasing the pulverized fuel outwardly of said curved portion.
- The pulverized fuel burning boiler as recited in claim 1 or 2, wherein said twist plate (312) is arranged to twist the flow of pulverized fuel and carrying air by 90 degrees.
- The pulverized fuel burning boiler as recited in claim 1, 2 or 3, wherein the horizontal width of said fuel nozzle portions (306a-e) is about three times the height thereof.
- A method of operating a pulverized fuel burning boiler according to any one of claims 1 to 4, comprising the following steps:supplying a pulverized fuel mixture with a shortage of air into the furnace through the burner (302) such that a rich pulverized fuel mixture is biased to the inner side of the furnace and such that the fuel concentration in the portion close to the furnace wall is reduced; andsupplying about 30 to 40% of all the combustion air through said additional air port (314) provided separately above said burner (302).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19980114219 EP0976977B1 (en) | 1998-07-29 | 1998-07-29 | Pulverized coal burner |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19980114219 Division EP0976977B1 (en) | 1998-07-29 | 1998-07-29 | Pulverized coal burner |
EP98114219.3 Division | 1998-07-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1219894A1 EP1219894A1 (en) | 2002-07-03 |
EP1219894B1 true EP1219894B1 (en) | 2006-04-05 |
Family
ID=8232370
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02006378A Expired - Lifetime EP1219893B1 (en) | 1998-07-29 | 1998-07-29 | Pulverized coal burner |
EP02006379A Expired - Lifetime EP1219894B1 (en) | 1998-07-29 | 1998-07-29 | Pulverized coal burner |
EP19980114219 Expired - Lifetime EP0976977B1 (en) | 1998-07-29 | 1998-07-29 | Pulverized coal burner |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02006378A Expired - Lifetime EP1219893B1 (en) | 1998-07-29 | 1998-07-29 | Pulverized coal burner |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19980114219 Expired - Lifetime EP0976977B1 (en) | 1998-07-29 | 1998-07-29 | Pulverized coal burner |
Country Status (1)
Country | Link |
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EP (3) | EP1219893B1 (en) |
Families Citing this family (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU6005301A (en) * | 2000-04-12 | 2001-10-23 | Saar Energie Gmbh | Method for burning particulate fuel in a power station boiler |
DE10019114A1 (en) * | 2000-04-18 | 2001-10-25 | Bbp Energy Gmbh | Furnace for coal dust combustion has swirl burners and air nozzles in walls, with primary and secondary air currents. |
SK287642B6 (en) * | 2000-08-04 | 2011-05-06 | Babcock-Hitachi Kabushiki Kaisha | Solid fuel burner and combustion method using solid fuel burner |
FR2848641B1 (en) * | 2002-12-11 | 2005-12-16 | Alstom Switzerland Ltd | INDIRECT HEATING SYSTEM WITH VALORIZATION OF ULTRA FINE FUEL PARTICLES |
EP1898150A4 (en) * | 2005-06-03 | 2010-08-11 | Zakrytoe Aktsionernoe Obschest | Steam-generator furnace |
CN101598333B (en) * | 2009-06-30 | 2012-09-26 | 上海锅炉厂有限公司 | Low-nitrogen oxide discharging coal powder tangential combustion device |
JP2011127836A (en) * | 2009-12-17 | 2011-06-30 | Mitsubishi Heavy Ind Ltd | Solid fuel burning burner and solid fuel burning boiler |
JP5374404B2 (en) | 2009-12-22 | 2013-12-25 | 三菱重工業株式会社 | Combustion burner and boiler equipped with this combustion burner |
DE102010052464A1 (en) * | 2010-11-24 | 2012-05-24 | Ludwig Müller | Rotary-power firing system comprises three or multiple air jets with higher air pulse, which are aligned on tangential circuit and are enclosed by housing for absorbing certain amount of hot combustion gases by air jet |
MX354826B (en) * | 2011-04-01 | 2018-03-21 | Mitsubishi Heavy Ind Ltd | Combustion burner, solid-fuel-fired burner, solid-fuel-fired boiler, boiler, and method for operating boiler. |
JP5800423B2 (en) * | 2011-11-29 | 2015-10-28 | 三菱日立パワーシステムズ株式会社 | Burner and boiler equipped with it |
US9377191B2 (en) | 2013-06-25 | 2016-06-28 | The Babcock & Wilcox Company | Burner with flame stabilizing/center air jet device for low quality fuel |
CN103322561A (en) * | 2013-07-04 | 2013-09-25 | 哈尔滨锅炉厂有限责任公司 | Double-chamber pulverized coal combustion device with deep classification function |
JP6087793B2 (en) * | 2013-11-15 | 2017-03-01 | 三菱日立パワーシステムズ株式会社 | boiler |
CN104494034B (en) * | 2014-12-26 | 2016-08-31 | 东莞市秋天塑胶材料有限公司 | PVC foam stove heating system |
DE102015226566A1 (en) * | 2015-12-22 | 2017-06-22 | Siemens Aktiengesellschaft | Bent main burner |
RU2635947C2 (en) * | 2016-04-12 | 2017-11-17 | федеральное государственное автономное образовательное учреждение высшего образования "Южно-Уральский государственный университет" (национальный исследовательский университет) | Boiler and method of its operation |
JP6879771B2 (en) * | 2017-02-17 | 2021-06-02 | 三菱パワー株式会社 | Combustion burner and boiler equipped with it |
CN107083258B (en) * | 2017-06-23 | 2024-03-26 | 航天长征化学工程股份有限公司 | Gasification burner device |
EP3438533B1 (en) | 2017-07-31 | 2021-03-03 | General Electric Technology GmbH | Coal nozzle assembly for a steam generation apparatus |
CN109458612A (en) * | 2017-09-06 | 2019-03-12 | 晋能电力集团有限公司 | A kind of low nitrogen combustion apparatus and combustion method of coal dust gasification burning |
CN108397766B (en) * | 2018-03-01 | 2020-06-05 | 中国神华能源股份有限公司 | Boiler and air distribution method thereof |
CN113790440A (en) * | 2021-10-26 | 2021-12-14 | 西安热工研究院有限公司 | Primary air nozzle of pulverized coal burner |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2343572A (en) * | 1940-07-01 | 1944-03-07 | Comb Eng Co Inc | Finely divided fuel burner |
DE890254C (en) * | 1950-03-05 | 1953-09-17 | Kohlenscheidungs Ges M B H | Method and device for the operation of pulverized coal furnaces for high-performance steam boilers |
JPS58129105A (en) * | 1982-01-29 | 1983-08-02 | Mitsubishi Heavy Ind Ltd | Method of burning pulverized coal burning tangential firing boiler |
DE3920798A1 (en) * | 1989-06-24 | 1991-01-10 | Balcke Duerr Ag | DEVICE FOR BURNING FUELS IN A COMBUSTION CHAMBER |
US5315939A (en) * | 1993-05-13 | 1994-05-31 | Combustion Engineering, Inc. | Integrated low NOx tangential firing system |
US5329866A (en) * | 1993-09-03 | 1994-07-19 | The Babcock & Wilcox Company | Combined low NOx burner and NOx port |
JPH08178210A (en) * | 1994-12-26 | 1996-07-12 | Mitsubishi Heavy Ind Ltd | Burner of furnace for gyratory combustion |
US5593298A (en) * | 1995-04-10 | 1997-01-14 | Combustion Components Associates, Inc. | Pollutant reducing modification of a tangentially fired furnace |
-
1998
- 1998-07-29 EP EP02006378A patent/EP1219893B1/en not_active Expired - Lifetime
- 1998-07-29 EP EP02006379A patent/EP1219894B1/en not_active Expired - Lifetime
- 1998-07-29 EP EP19980114219 patent/EP0976977B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP1219893B1 (en) | 2006-01-18 |
EP0976977A1 (en) | 2000-02-02 |
EP1219894A1 (en) | 2002-07-03 |
EP1219893A1 (en) | 2002-07-03 |
EP0976977B1 (en) | 2003-03-26 |
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