CN111649324B - Burner and boiler - Google Patents

Burner and boiler Download PDF

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Publication number
CN111649324B
CN111649324B CN202010537530.5A CN202010537530A CN111649324B CN 111649324 B CN111649324 B CN 111649324B CN 202010537530 A CN202010537530 A CN 202010537530A CN 111649324 B CN111649324 B CN 111649324B
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China
Prior art keywords
combustion
gas
supporting medium
fuel
mixed fuel
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Application number
CN202010537530.5A
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Chinese (zh)
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CN111649324A (en
Inventor
初伟
凌崇光
王炯
刘升飞
张文振
刘平
张超群
王西伦
李驰
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Guodian Jiujiang Power Generation Co ltd
Xinjiang Guanghui Coal Clean Refining & Chemical Co ltd
Yantai Longyuan Power Technology Co Ltd
Original Assignee
Guodian Jiujiang Power Generation Co ltd
Xinjiang Guanghui Coal Clean Refining & Chemical Co ltd
Yantai Longyuan Power Technology Co Ltd
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Application filed by Guodian Jiujiang Power Generation Co ltd, Xinjiang Guanghui Coal Clean Refining & Chemical Co ltd, Yantai Longyuan Power Technology Co Ltd filed Critical Guodian Jiujiang Power Generation Co ltd
Priority to CN202010537530.5A priority Critical patent/CN111649324B/en
Publication of CN111649324A publication Critical patent/CN111649324A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • 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

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

Abstract

The present disclosure provides a burner and a boiler, the burner comprising: the fuel mixer is provided with a mixing cavity, more than two gas inlets and a mixed fuel outlet, wherein the more than two gas inlets are communicated with the mixing cavity; the combustion cylinder is provided with an inlet end connected with the fuel mixer and an outlet end used for being communicated with the hearth, and comprises a mixed fuel injection cylinder and a combustion-supporting medium injection cylinder, wherein the inlet end of the mixed fuel injection cylinder is communicated with a mixed fuel outlet of the fuel mixer and is configured to convey mixed fuel to the outlet end of the combustion cylinder, and the combustion-supporting medium injection cylinder is configured to convey combustion-supporting medium to the outlet end of the combustion cylinder; an igniter including a firing end disposed at the outlet end of the combustion can, the firing end configured to ignite the mixed fuel at the outlet end of the combustion can. The present disclosure can reduce the amount of nitrogen oxides produced during combustion of a gas.

Description

Burner and boiler
Technical Field
The present disclosure relates to the field of combustion equipment, and more particularly, to a burner and a boiler.
Background
The fuel gas is a high-quality, high-efficiency and clean fuel, and although the emission of solid particles and sulfur dioxide is greatly reduced by using the fuel gas, the problem of nitrogen oxide (NOx) emission is still not effectively solved.
High calorific value gas (such as natural gas, coke oven gas, converter gas and the like) has high heat generation, and the flame temperature is high in the combustion process, so that a large amount of nitrogen oxides can be generated. At present, low-nitrogen modification technologies for gas-fired boilers mainly comprise an air grading technology in a boiler, an air flue gas recirculation technology, a Selective Non-Catalytic Reduction (SNCR) technology and the like, and after the low-nitrogen modification technology is adopted, the emission of nitrogen oxides is about 100mg/Nm 3 (converted to 3% baseline oxygen content). The nitrogen oxide emission is controlled to 50mg/Nm 3 (converted to 3% of the reference oxygen content) or less, even 30mg/Nm 3 (reduced to 3% baseline oxygen content) Selective Catalytic Reduction (SCR) technology is typically employed, which, while reducing nitrogen oxide emissions, can result in higher capital and operating maintenance costs.
Disclosure of Invention
The purpose of this disclosure is to provide a combustor and a boiler to reduce the emission of nitrogen oxides during combustion in a gas boiler.
A first aspect of the present disclosure provides a burner comprising: the fuel mixer is provided with a mixing cavity, more than two gas inlets communicated with the mixing cavity and a mixed fuel outlet, and is configured to mix more than two gases introduced into the mixing cavity from the more than two gas inlets to form mixed fuel and output the mixed fuel from the mixed fuel outlet;
the inlet end of the combustion cylinder is communicated with the mixed fuel outlet of the fuel mixer and is configured to convey the mixed fuel to the outlet end of the combustion cylinder, and the combustion-supporting medium injection cylinder is configured to convey combustion-supporting medium to the outlet end of the combustion cylinder;
an igniter including a firing end disposed at the outlet end of the combustion can, the firing end configured to ignite the mixed fuel at the outlet end of the combustion can.
In accordance with some embodiments of the present disclosure,
the igniter is arranged inside the mixed fuel spray cylinder;
a mixed fuel passage is formed between the mixed fuel spray cylinder and the igniter and is configured to convey the mixed fuel to the outlet end of the combustion cylinder;
the combustion-supporting medium spray barrel comprises a first combustion-supporting medium spray barrel and a second combustion-supporting medium spray barrel, the first combustion-supporting medium spray barrel is sleeved outside the mixed fuel spray barrel, a first combustion-supporting medium channel is formed between the first combustion-supporting medium spray barrel and the mixed fuel spray barrel, the first combustion-supporting medium channel is configured to convey the combustion-supporting medium to the outlet end of the combustion barrel, the second combustion-supporting medium spray barrel is sleeved outside the first combustion-supporting medium spray barrel, a second combustion-supporting medium channel is formed between the second combustion-supporting medium spray barrel and the first combustion-supporting medium spray barrel, and the second combustion-supporting medium channel is configured to convey the combustion-supporting medium to the outlet end of the combustion barrel.
According to some embodiments of the present disclosure, the combustion can further comprises:
a first swirler disposed within the mixed fuel passage; and/or the presence of a gas in the atmosphere,
the second swirler is arranged in the first combustion-supporting medium channel; and/or the presence of a gas in the gas,
and the third swirler is arranged in the second combustion-supporting medium channel.
According to some embodiments of this disclosure, the combustor still includes the gas distributor, the gas distributor includes the gas distribution pipe, the entrance point of gas distribution pipe connect in the fuel mixer and with the mixing chamber intercommunication or with the gas feed intercommunication, the exit end of gas distribution pipe set up in the periphery of the exit end of a combustion section of thick bamboo, be used for with the furnace intercommunication.
According to some embodiments of the disclosure, the gas distributor further comprises a fourth cyclone disposed at an outlet end of the gas distribution pipe.
According to some embodiments of the present disclosure, the outlet end of the first combustion medium ejection cylinder comprises a convergent-divergent nozzle.
According to some embodiments of the present disclosure, the tapered section of the convergent-divergent spout has a taper angle of 40 ° or less, and the tapered section of the convergent-divergent spout has a taper angle of 50 ° or less.
According to some embodiments of the present disclosure, a projection area of the tapered section of the convergent-divergent spout in the axial direction of the first combustion supporting medium jet cylinder is less than or equal to 70% of a projection area of the first combustion supporting medium channel in the axial direction of the first combustion supporting medium jet cylinder.
According to some embodiments of the present disclosure, an inlet-side edge of the convergent-divergent nozzle is located outside an outlet-side edge of the mixed fuel nozzle cartridge in an axial direction of the combustion cartridge.
According to some embodiments of the disclosure, the outlet end of the second combustion supporting medium injection lance comprises a divergent spout.
According to some embodiments of the present disclosure, an outlet side edge of the diverging nozzle is located outside an outlet side edge of the diverging section of the converging-diverging nozzle or between the inlet side edge and the outlet side edge of the diverging section of the converging-diverging nozzle in an axial direction of the combustion can.
According to some embodiments of the disclosure, the fuel mixer comprises:
a fuel mixer body having the mixing chamber;
the more than two conveying pipes are respectively connected to the more than two gas inlets of the fuel mixer body, and the outlet end of each conveying pipe is provided with a gas orifice communicated with the mixing cavity;
the flow equalizing plate is arranged at the outlet end of the fuel mixer, a plurality of flow equalizing holes are formed in the flow equalizing plate, and the inlet end of the mixed fuel spray cylinder is communicated with the flow equalizing holes; and
the gas mixing plate is arranged between the outlet end of the conveying pipe and the flow equalizing plate, and a plurality of gas mixing holes are formed in the gas mixing plate.
According to some embodiments of the disclosure, the two or more ducts comprise:
the first gas nozzle is configured to inject first gas into the mixing cavity; and/or
The second gas spray pipe is configured to introduce a second gas into the mixing cavity; and/or
A flue gas nozzle configured to introduce flue gas into the mixing chamber.
According to some embodiments of the present disclosure, the gas injection holes of at least one of the transport pipes include a plurality of first holes provided to a circumferential surface of the outlet end of the transport pipe and a plurality of second holes provided to an axial end face of the outlet end of the transport pipe.
According to some embodiments of the present disclosure, the fuel mixer, the igniter, the mixed fuel injection cylinder, the first combustion-supporting medium injection cylinder, and the second combustion-supporting medium injection cylinder are coaxially disposed.
A second aspect of the present disclosure provides a boiler comprising a boiler body and the burner of the first aspect of the present disclosure, wherein an outlet end of a combustion cylinder of the burner is connected to the boiler body and communicated with a hearth of the boiler body.
According to the combustor and the boiler, the fuel mixer is arranged, so that gases with different heat values can be introduced into the mixing cavity from different gas inlets and then mixed to form mixed fuel with the heat value, for example, high-heat-value gas and boiler flue gas or low-heat-value gas are mixed to form mixed fuel, the adjustment of components of single gas fuel is facilitated, compared with the mixed fuel, the heat value of the high-heat-value gas before mixing is reduced, the heat productivity during combustion is lower, the flame temperature is lower, and the reduction of the discharge amount of nitrogen oxides of the gas boiler is facilitated.
Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure. In the drawings:
FIG. 1 is a cross-sectional structural schematic view of a combustor according to some embodiments of the present disclosure.
FIG. 2 is a partial schematic structural view of a combustor according to some embodiments of the present disclosure.
FIG. 3 is a schematic structural view of some embodiments of flow equalization plates of a combustor according to some embodiments of the present disclosure.
FIG. 4 is a schematic structural view of other embodiments of flow equalization plates of a combustor according to some embodiments of the present disclosure.
FIG. 5 is a schematic structural view of a gas mixing plate of a combustor according to some embodiments of the present disclosure.
In fig. 1 to 5, each reference numeral represents:
1. a fuel mixer; 10. a fuel mixer body; 110. a flue gas nozzle; 111. a first gas nozzle; 112. a second gas jet pipe; 12. a gas mixing plate; 120. air mixing holes; 13. a flow equalizing plate; 130. a flow equalizing hole; 2. an igniter; 3. a mixed fuel injection barrel; 31. a first swirler; 4. a first combustion-supporting medium spray cylinder; 40. a nozzle is zoomed; 41. a second swirler; 5. a second combustion-supporting medium spray cylinder; 50. a gradually expanding nozzle; 51. a third cyclone; 6. a gas distributor; 61. a fourth swirler; r0, a mixed fuel channel; r1, a first combustion-supporting medium channel; r2 is a second combustion-supporting medium channel; h1, a first hole; h2, second pore.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without inventive step, are intended to be within the scope of the present disclosure.
The relative arrangement of parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present disclosure, it should be understood that the terms "first", "second", etc. are used to define the components, and are used only for convenience of distinguishing the corresponding components, and if not otherwise stated, the terms have no special meaning, and thus, should not be construed as limiting the scope of the present disclosure.
In the description of the present disclosure, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are presented only for the convenience of describing and simplifying the disclosure, and in the absence of a contrary indication, these directional terms are not intended to indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the disclosure; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
As shown in fig. 1, some embodiments of the present disclosure provide a burner including a fuel mixer 1, a combustion can, and an igniter 2.
The fuel mixer 1 is provided with a mixing cavity, more than two gas inlets communicated with the mixing cavity and a mixed fuel outlet, and the fuel mixer 1 is configured to mix more than two gases introduced into the mixing cavity from the more than two gas inlets to form mixed fuel and output the mixed fuel from the mixed fuel outlet. The more than two kinds of gas can be fuel gas with high calorific value and flue gas of a boiler, can also be fuel gas with two different calorific values, and can also be more than two kinds of fuel gas and flue gas of a boiler.
The inlet end of the combustion cylinder is connected with a fuel mixer 1, and the outlet end is communicated with a hearth of a boiler and comprises a mixed fuel injection cylinder 3 and a combustion-supporting medium injection cylinder. The inlet end of the mixed fuel injection cylinder 3 communicates with the mixed fuel outlet of the fuel mixer 1, and is configured to deliver the mixed fuel to the outlet end of the combustion cylinder. The combustion-supporting medium spray cylinder is configured to convey the combustion-supporting medium to the outlet end of the combustion cylinder. The combustion-supporting medium can be air or the mixed gas of air and flue gas.
The igniter 2 includes a firing end disposed at the outlet end of the combustion can, the firing end configured to ignite the mixed fuel at the outlet end of the combustion can.
According to the combustor provided by the embodiment of the disclosure, by arranging the fuel mixer, high calorific value fuel gas can be mixed with flue gas of a boiler or low calorific value fuel gas, the fuel gas component at the outlet end of the combustion cylinder is changed, the mixed fuel has a lower calorific value compared with the high calorific value fuel gas, the calorific value is lower during combustion, the flame temperature is lower, and the reduction of the discharge amount of nitrogen oxides of the gas boiler is facilitated.
In some embodiments, the igniter 2 is disposed inside the mixed fuel nozzle barrel 3. The mixed fuel nozzle barrel 3 and the igniter 2 form a mixed fuel passage R0 therebetween, and the mixed fuel passage R0 is configured to deliver the mixed fuel to the outlet end of the combustion barrel. The combustion-supporting medium spray barrel comprises a first combustion-supporting medium spray barrel 4 and a second combustion-supporting medium spray barrel 5, the first combustion-supporting medium spray barrel 4 is sleeved outside the mixed fuel spray barrel 3, a first combustion-supporting medium channel R1 is formed between the first combustion-supporting medium spray barrel 4 and the mixed fuel spray barrel 3, and the first combustion-supporting medium channel R1 is configured to convey combustion-supporting medium to the outlet end of the combustion barrel. The second combustion-supporting medium spraying cylinder 5 is sleeved outside the first combustion-supporting medium spraying cylinder 4, a second combustion-supporting medium channel R2 is formed between the second combustion-supporting medium spraying cylinder 5 and the first combustion-supporting medium spraying cylinder 4, and the second combustion-supporting medium channel R2 is configured to convey combustion-supporting medium to the outlet end of the combustion cylinder. In the axial direction of the combustion cylinder, the outlet side edge of the first combustion-supporting medium spray cylinder 4 and the outlet side edge of the second combustion-supporting medium spray cylinder 5 are both positioned outside the outlet side edge of the mixed fuel spray cylinder 3.
In some embodiments, the combustor can further include a swirler, which may include one or more of a first swirler 31 disposed within the mixed fuel passage R0, a second swirler 41 disposed within the first combustion medium passage R1, and a third swirler 51 disposed within the second combustion medium passage R2. The swirler is arranged in the channel of the combustion cylinder, so that gas passing through the channel can form rotating airflow, the gas in the channel is more fully mixed with gas in the peripheral channel or in the hearth, and stable combustion of mixed fuel is facilitated.
In some embodiments, the burner further comprises a gas distributor 6, the gas distributor 6 comprises a gas distribution pipe, an inlet end of the gas distribution pipe is connected to the fuel mixer 1 and is communicated with the mixing chamber to deliver mixed fuel, the inlet end of the gas distribution pipe can also be directly communicated with the gas inlet to deliver single fuel, and an outlet end of the gas distribution pipe is arranged on the periphery of the outlet end of the combustion cylinder and is used for being communicated with the hearth.
In some embodiments, the gas distributor 6 further comprises a fourth cyclone 61 arranged at the outlet end of the gas distribution pipe.
The gas in the gas distributor 6 forms rotary airflow through the fourth cyclone 61 and enters the hearth, the gas sucks the flue gas in the hearth in a entrainment mode and is mixed with the flue gas, then the flue gas is mixed with the combustion-supporting medium sprayed out of the second combustion-supporting medium channel R2, the mixed fuel sprayed out of the mixed fuel channel R0 burns around the flame, and the gas distributor 6 is arranged to further reduce the flame concentration degree and the flame temperature, so that the generation of nitrogen oxides in the combustion process is reduced.
As shown in fig. 1 and 2, in some embodiments, the outlet end of the first combustion medium ejection cylinder 4 comprises a convergent-divergent nozzle 40. The convergent-divergent nozzle 40 helps the combustion-supporting medium in the first combustion-supporting medium channel R1 to flow to the outlet end of the mixed fuel injection cylinder 3, and helps the combustion-supporting medium in the first combustion-supporting medium channel R1 to be fully mixed with the mixed fuel, and helps to form a reducing atmosphere in the flame region, so that a part of nitrogen oxides generated by combustion can be reduced.
In some embodiments, the taper angle of the tapered section of the zoom spout 40 (i.e., angle a1 in FIG. 2) is less than or equal to 40 and the taper angle of the diverging section of the zoom spout 40 (i.e., angle a2 in FIG. 2) is less than or equal to 50.
In some embodiments, the axial projected area (the torus with the width L1) of the tapered section of the convergent-divergent spout 40 on the first combustion supporting medium ejector 4 is less than or equal to 70% of the axial projected area (the torus with the width L2) of the first combustion supporting medium channel R1 on the first combustion supporting medium ejector 4.
As shown in fig. 1 and 2, in some embodiments the outlet end of the second combustion supporting medium lance 5 comprises a divergent spout 50. The divergent nozzle 50 is helpful for the combustion-supporting medium in the second combustion-supporting medium channel R2 to flow to the outer side of the first combustion-supporting medium spray tube 4, so that the combustion-supporting medium in the second combustion-supporting medium channel R2 is delayed from participating in the combustion of the mixed fuel, the flame concentration degree can be dispersed, the flame peak temperature is reduced, and the generation of nitrogen oxides is reduced.
In some embodiments, as shown in FIGS. 1 and 2, the inlet-side edge of the convergent-divergent nozzle 40 is located outside the outlet-side edge of the mixed-fuel nozzle barrel 3 in the axial direction of the combustion barrel.
In some embodiments, as shown in FIG. 1, the outlet side edge of the diverging nozzle 50 is located outboard of the outlet side edge of the diverging section of the converging-diverging nozzle, in the axial direction of the combustion can.
In some embodiments, as shown in FIG. 2, the outlet side edge of the diverging nozzle 50 is located between the inlet side edge and the outlet side edge of the diverging section of the converging-diverging nozzle 40 in the axial direction of the combustion can.
The arrangement of the position relation of each part of the mixed fuel injection cylinder 3, the first combustion-supporting medium injection cylinder 4 and the second combustion-supporting medium injection cylinder 5 is beneficial to reasonably controlling the mixing time and the mixing degree of the mixed fuel and the combustion-supporting medium so as to be beneficial to adjusting flame parameters such as flame intensity and the like, thereby being beneficial to coordinating the stability of flame and the quantity of nitrogen oxides.
In some embodiments, the fuel mixer 1 includes a fuel mixer body 10, two or more delivery pipes, a flow equalizing plate 13, and an air mixing plate 12. Wherein the fuel mixer body 10 has the mixing chamber. The two or more delivery pipes are respectively connected to two or more gas inlets of the fuel mixer body 10, and the outlet end of each delivery pipe is provided with a gas orifice communicated with the mixing chamber.
As shown in fig. 1, 3 and 4, the flow equalizing plate 13 is disposed at an outlet end of the fuel mixer 1, and a plurality of flow equalizing holes 130 are disposed on the flow equalizing plate 13. The shape of the equalizing hole 130 may be various, for example, a circular shape as shown in fig. 3 or a fan-ring shape as shown in fig. 4. The inlet end of the mixed fuel injection cylinder 3 communicates with a plurality of flow equalizing holes 130.
As shown in fig. 1 and fig. 5, the gas mixing plate 12 is disposed between the outlet end of the conveying pipe and the flow equalizing plate 13, the gas mixing plate 12 is provided with a plurality of gas mixing holes 120, the gas mixing holes 120 may include a through hole disposed in the middle of the gas mixing plate 12, or may include a notch disposed at the edge of the gas mixing plate 12, and the shape of the notch may be various, for example, a wedge-shaped notch.
According to the above configuration, more than two kinds of gases enter the mixing chamber through more than two gas inlets of the fuel mixer body 10 to be primarily mixed, the primarily mixed gases pass through the gas mixing holes 120 and the gas mixing plate 12 and then are mixed again to form a mixed fuel with a relatively low heat value, and the mixed fuel is delivered to the mixed fuel injection barrel 3 of the combustion barrel through the flow equalizing holes 130 of the flow equalizing plate 13. Compared with high-calorific-value gas before mixing, the combustion characteristics of the mixed fuel are changed, the calorific value is low, the flame temperature is low in the combustion process, and the reduction of the generation amount of nitrogen oxides is facilitated.
In some embodiments, the two or more ducts include at least two of the first gas lance 111, the second gas lance 112, or the flue gas lance 110. The first gas nozzle 111 is configured to introduce the first gas into the mixing chamber; the second gas nozzle 112 is configured to introduce the second gas into the mixing chamber; the flue gas nozzles 110 are configured to introduce flue gas into the mixing chamber.
The inlet end of the first gas jet pipe 111 or the second gas jet pipe 112 is communicated with the gas source, and the outlet end is communicated with the mixing cavity of the fuel mixer 1. The inlet end of the flue gas nozzle 110 may be connected to the furnace, flue, etc. of the boiler or other boiler where the burner is located, and the outlet end is connected to the mixing chamber of the fuel mixer 1.
The fuel mixer 1 can be provided with a fuel gas spray pipe (a first fuel gas spray pipe 111 or a second fuel gas spray pipe 112) and a flue gas spray pipe 110, wherein the fuel gas spray pipe introduces a high-calorific-value fuel gas into the mixing cavity, the flue gas spray pipe 110 introduces flue gas into the mixing cavity, and the high-calorific-value fuel gas is mixed with the flue gas and diluted into a mixed fuel with a lower calorific value; two gas jet pipes (a first gas jet pipe 111 and a second gas jet pipe 112) can also be arranged and respectively introduce two kinds of gas with different heat values into the mixing cavity; the first gas spray pipe 111, the second gas spray pipe 112 and the flue gas spray pipe 110 can also be arranged at the same time, two kinds of gas with different heat values are respectively introduced into the mixing cavity through the first gas spray pipe 111 and the second gas spray pipe 112, flue gas is introduced into the mixing cavity through the flue gas spray pipe 110, and the gas with the two heat values is mixed with the flue gas to form mixed fuel with a lower heat value.
In some embodiments, the gas injection holes of at least one of the two or more transport tubes include a plurality of first holes H1 provided in a circumferential surface of the outlet end of the transport tube and a plurality of second holes H2 provided in an axial end face of the outlet end of the transport tube. The first hole H1 and the second hole H2 are arranged on the conveying pipe at the same time, so that the mixing effect of various gases in the fuel mixer 1 can be improved.
In some embodiments, the fuel mixer 1, the igniter 2, the mixed fuel injection cylinder 3, the first combustion-supporting medium injection cylinder 4 and the second combustion-supporting medium injection cylinder 5 are coaxially arranged.
Some embodiments of the present disclosure also provide a boiler, including a boiler body and the aforementioned burner, an outlet end of a combustion cylinder of the burner is connected to the boiler body and communicates with a furnace of the boiler body. The boiler has the corresponding advantages of the burner.
Finally, it should be noted that: the above examples are intended only to illustrate the technical solution of the present disclosure and not to limit it; although the present disclosure has been described in detail with reference to preferred embodiments, those of ordinary skill in the art will understand that: modifications to the embodiments of the present disclosure or equivalent substitutions for parts of the technical features can be made, which are intended to be covered by the technical scope of the present disclosure.

Claims (11)

1. A burner, comprising:
the fuel mixer comprises a fuel mixer (1) and a fuel mixing device, wherein the fuel mixer (1) is provided with a mixing cavity, more than two gas inlets communicated with the mixing cavity and a mixed fuel outlet, the fuel mixer (1) is configured to mix more than two gases introduced into the mixing cavity from the more than two gas inlets to form mixed fuel and output the mixed fuel from the mixed fuel outlet, the fuel mixer (1) comprises a fuel mixer body (10), more than two conveying pipes, a flow equalizing plate (13) and a gas mixing plate (12), and the fuel mixer body (10) is provided with the mixing cavity; the fuel mixer comprises a fuel mixer body (10), more than two conveying pipes, a plurality of flow equalizing plates (12), more than two gas mixing holes (120), a plurality of mixing cavities (130), a plurality of mixing holes (13), a plurality of mixed fuel spray pipes (3), a plurality of mixing holes (130), a plurality of mixing holes (13) and a plurality of mixing holes (120), wherein the more than two conveying pipes are respectively connected to more than two gas inlets of the fuel mixer body (10);
the inlet end of the combustion cylinder is connected with the fuel mixer (1), the outlet end of the combustion cylinder is used for being communicated with a hearth, the combustion cylinder comprises a mixed fuel injection cylinder (3) and a combustion-supporting medium injection cylinder, the inlet end of the mixed fuel injection cylinder (3) is communicated with the mixed fuel outlet of the fuel mixer (1) and is configured to convey the mixed fuel to the outlet end of the combustion cylinder, and the combustion-supporting medium injection cylinder is configured to convey combustion-supporting medium to the outlet end of the combustion cylinder;
an igniter (2) including a firing end disposed at the outlet end of the combustion can, the firing end configured to ignite the mixed fuel at the outlet end of the combustion can;
wherein the igniter (2) is arranged inside the mixed fuel injection cylinder (3);
a mixed fuel channel (R0) is formed between the mixed fuel injection cylinder (3) and the igniter (2), and the mixed fuel channel (R0) is configured to convey the mixed fuel to the outlet end of the combustion cylinder;
the combustion-supporting medium spray barrel comprises a first combustion-supporting medium spray barrel (4) and a second combustion-supporting medium spray barrel (5), the first combustion-supporting medium spray barrel (4) is sleeved outside the mixed fuel spray barrel (3), a first combustion-supporting medium channel (R1) is formed between the first combustion-supporting medium spray barrel (4) and the mixed fuel spray barrel (3), the first combustion-supporting medium channel (R1) is configured to convey the combustion-supporting medium to the outlet end of the combustion barrel, the second combustion-supporting medium spray barrel (5) is sleeved outside the first combustion-supporting medium spray barrel (4), a second combustion-supporting medium channel (R2) is formed between the second combustion-supporting medium spray barrel (5) and the first combustion-supporting medium spray barrel (4), and the second combustion-supporting medium channel (R2) is configured to convey the combustion-supporting medium to the outlet end of the combustion barrel;
the outlet end of the first combustion-supporting medium spray barrel (4) comprises a convergent-divergent spray nozzle (40), the outlet end of the second combustion-supporting medium spray barrel (5) comprises a divergent spray nozzle (50), and the edge of the outlet side of the divergent spray nozzle (50) is positioned between the edge of the inlet side and the edge of the outlet side of the divergent section of the convergent-divergent spray nozzle (40) along the axial direction of the combustion barrel.
2. The combustor as in claim 1, wherein the combustion can further comprises:
a first swirler (31) disposed within the mixed fuel passage (R0); and/or the presence of a gas in the gas,
a second swirler (41) arranged in the first combustion medium channel (R1); and/or the presence of a gas in the atmosphere,
and a third swirler (51) arranged in the second combustion-supporting medium channel (R2).
3. The burner according to claim 1, further comprising a gas distributor (6), wherein the gas distributor (6) comprises a gas distribution pipe, the inlet end of the gas distribution pipe is connected to the fuel mixer (1) and communicated with the mixing chamber or communicated with the gas inlet, and the outlet end of the gas distribution pipe is arranged at the periphery of the outlet end of the combustion cylinder and used for being communicated with the hearth.
4. A burner according to claim 3, wherein the gas distributor (6) further comprises a fourth swirler (61) arranged at the outlet end of the gas distribution tube.
5. Burner according to claim 1, characterized in that the tapered section of the convergent-divergent nozzle (40) has a cone angle of 40 ° or less and the tapered section of the convergent-divergent nozzle (40) has a cone angle of 50 ° or less.
6. Burner according to claim 1, characterized in that the projected area of the tapered section of the convergent-divergent spout (40) in the axial direction of the first comburent medium ejector (4) is less than or equal to 70% of the projected area of the first comburent medium channel (R1) in the axial direction of the first comburent medium ejector (4).
7. A burner according to claim 1, characterized in that the inlet side edge of the convergent-divergent nozzle (40) is located outside the outlet side edge of the mixed fuel nozzle (3) in the axial direction of the combustion can.
8. The burner of claim 1, wherein the two or more ducts comprise:
a first gas nozzle (111) configured to introduce a first gas into the mixing chamber; and/or
A second gas injection pipe (112) configured to introduce a second gas into the mixing chamber; and/or
A flue gas lance (110) configured to pass flue gas into the mixing chamber.
9. A burner according to claim 1, wherein the gas injection holes of at least one of the ducts comprise a first plurality of holes (H1) provided in the circumferential surface of the outlet end of the duct and a second plurality of holes (H2) provided in the axial end face of the outlet end of the duct.
10. Burner according to any of the claims from 1 to 7, characterized in that said fuel mixer (1), said igniter (2), said mixed fuel injection cylinder (3), said first combustion medium injection cylinder (4) and said second combustion medium injection cylinder (5) are coaxially arranged.
11. A boiler, characterized by comprising a boiler body and a burner according to any one of claims 1 to 10, the outlet end of the combustion cylinder of the burner being connected to the boiler body and communicating with the furnace of the boiler body.
CN202010537530.5A 2020-06-12 2020-06-12 Burner and boiler Active CN111649324B (en)

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