CN111237750A - Thick-thin burner - Google Patents
Thick-thin burner Download PDFInfo
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- CN111237750A CN111237750A CN202010088208.9A CN202010088208A CN111237750A CN 111237750 A CN111237750 A CN 111237750A CN 202010088208 A CN202010088208 A CN 202010088208A CN 111237750 A CN111237750 A CN 111237750A
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- coal
- pulverized coal
- concentration
- pipeline
- nozzle
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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
- F23D—BURNERS
- F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
- F23D2201/10—Nozzle tips
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
Abstract
The invention provides a thick and thin burner, comprising: two pulverized coal inlet pipelines, one end of each pipeline is a pulverized coal inlet, and the other ends of the pipelines are mutually crossed to form a V shape; the horizontal main pipeline is connected with the intersection of the two pulverized coal inlet pipelines, a flow guide plate is arranged in the horizontal main pipeline, the pulverized coal main pipeline is arranged in the flow guide plate, and the pulverized coal auxiliary pipeline is arranged outside the flow guide plate; the nozzle is horn-shaped and is connected with the guide plate; and a plurality of bluff body components which are distributed around the nozzle near the outlet end, wherein the horizontal main pipe is connected with the coal powder inlet pipe in a 150-degree round chamfer angle, the round chamfer angle enables the coal powder concentration at two sides of the horizontal main pipe to be lower than the central concentration, thereby completing the primary concentration separation of the coal powder, one side of the guide plate near the coal powder inlet pipe forms an angle of 120-150 degrees with the incoming flow direction of the coal powder, and is used for separating the low-concentration coal powder at two sides of the coal powder main pipe into the coal powder auxiliary pipe, the nozzle enables the coal powder not to be rapidly diffused to the boundary, so that the coal powder at the nozzle is high in middle concentration and low.
Description
Technical Field
The invention relates to a combustor, in particular to a thick and thin combustor.
Background
Relevant departments count that the annual power generation amount in 2017 is 62758 hundred million kilowatt hours, wherein the thermal power generation amount is 46115 hundred million kilowatt hours, the thermal power generation amount accounts for nearly 73.5% of the total annual power generation amount, and due to the special energy structure of rich coal, poor oil and little gas in China, the fact that the electric power in China is formed by coal-fired power generation in a long period of time in the future also means that the electric power in China is formed by coal-fired power generation. With the increasing environmental problems accompanying the increasing economic and comprehensive national powers in China, people have higher and higher environmental pursuits after the living standard of people is improved, so that the emission standard of pollutants, state hospitals and various countries are metAnd put more stringent requirements on the ground. In 2015 for 12 months, the national institute provides the comprehensive implementation of ultralow emission and energy-saving improvement of the coal-fired power plant. In 2020, all coal-fired power plants with reconstruction conditions strive to realize ultra-low emission (namely, under the condition that the reference oxygen content is 6 percent, the emission concentrations of smoke dust, sulfur dioxide and nitrogen oxide are respectively not higher than 10, 35 and 50mg/Nm3)。NOxHas great harm to environment, is one of the main substances forming acid rain, is an important substance forming photochemical smog in the atmosphere and consumes O3Is an important factor of.
Reduction of NO in the present power plantxThe method comprises an SCR method and an SNCR method, but the required ammonia amount is more and more along with the environmental protection requirement is lower and lower, so that ammonia escapes, ammonia gas and components in the smoke gas generate complex chemical reaction to generate ammonium bisulfate, the ammonium bisulfate blocks and corrodes the air preheater, the service life of the air preheater is greatly influenced, and the air preheater can be shut down and refitted in severe cases.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a rich-lean burner.
The invention provides a rich-lean burner, which is characterized by comprising the following components: two coal dust inlet pipelines, one end of each coal dust inlet pipeline is a coal dust inlet, and the other ends of the coal dust inlet pipelines are mutually crossed to enable the two coal dust inlet pipelines to be V-shaped; the horizontal main pipeline is connected with the intersection of the two pulverized coal inlet pipelines, the upper side and the lower side of the interior of the horizontal main pipeline are provided with flow deflectors, the part between the flow deflectors on the two sides is the pulverized coal main pipeline, and the exterior of the horizontal main pipeline is the pulverized coal auxiliary pipeline; the nozzle is horn-shaped and is connected with the guide plate; and a plurality of bluff body components which are in a regular hexagon shape and are distributed around the nozzle close to the outlet end for forming a streaming core area around the nozzle so as to increase the entrainment capacity of primary air jet flow and enable the primary air jet flow to quickly catch fire, wherein the horizontal main pipe is connected with the pulverized coal inlet pipe in a 150-degree round chamfer angle, the round chamfer angle enables the concentration of the pulverized coal on two sides of the horizontal main pipe to be lower than the central concentration, thereby completing the primary concentration separation of the pulverized coal, one side of the flow guide plate close to the pulverized coal inlet pipe forms an angle of 120-150 degrees with the incoming flow direction of the pulverized coal, and is used for separating low-concentration pulverized coal on two sides of the pulverized coal main pipe into the pulverized coal auxiliary pipe, the nozzle enables the pulverized coal not to be quickly diffused to the boundary, thereby enabling the concentration of the.
The rich-lean burner provided by the present invention may further have the following features: wherein the shape of the bluff body component is a regular hexagon.
The rich-lean burner provided by the present invention may further have the following features: wherein, the spout surface is the rectangle, and a plurality of blunt body components are evenly distributed along the four sides of spout.
Action and Effect of the invention
According to the rich-lean burner, the horizontal main pipe and the coal powder inlet pipe form a 150-degree round chamfer, so that coal powder can be injected into the coal powder main pipe at an included angle of 150 degrees, meanwhile, coal powder particles have larger inertia, so that the coal powder particles are concentrated towards the center of the coal powder main pipe, the concentration of the middle coal powder is higher, the coal powder concentration is lower at two sides of the coal powder main pipe, a preliminary rich-lean separation effect is generated, the coal powder in the upper coal powder pipe and the lower coal powder pipe are impacted with each other due to the conservation of angle and momentum, the speed in the vertical direction is offset, the speed in the horizontal direction is accelerated, and the influence of deceleration caused by the increase of the cross sectional area at the outlet of the burner is; because the angle between the horizontal main pipeline and the pulverized coal inlet pipeline is the round chamfer, the flow field of pulverized coal can be more uniform when the pulverized coal is introduced into the pulverized coal main pipeline, the pipeline abrasion is reduced, and meanwhile, compared with connection with a sharp corner, the existence of the round chamfer can enable the streamline of the pulverized coal in the pulverized coal pipeline, which enters the main pipeline, to be more uniform; because the side of the flow guide plate, which is close to the pulverized coal inlet pipeline, has a certain angle with the incoming flow direction of the pulverized coal, the low-concentration pulverized coal at two sides of the main pulverized coal pipeline can be guided into the auxiliary pulverized coal pipeline under the condition of not influencing the flow field of the main pulverized coal pipeline, so that the pulverized coal is excessively large in air quantity, low in combustion temperature and reduced in thermal NOxThe amount of production of (c); because the nozzle is trumpet-shaped, the cross-sectional area of the outlet is enlarged, and the pulverized coal particles cannot be completely enlarged when leaving the nozzle due to the extremely large momentum inertiaThe pulverized coal is dispersed to the periphery of the nozzle, so that the concentration of the pulverized coal at the periphery of the nozzle is low, and the pulverized coal has overlarge air quantity and low combustion temperature, thereby leading the thermal NO to bexThe generated amount of the coal is reduced, and simultaneously, because the coal powder at the middle part has high concentration and is burnt in an oxygen-deficient environment, NO can be reducedxAnd the high-concentration coal powder can reduce ignition heat and improve ignition stability.
Therefore, when the rich-lean burner of the present invention is used for combustion, the oxygen is insufficient in the rich part of the fuel, and the combustion temperature is not high, so that the fuel type NO is usedxAnd thermal NOxWill be reduced, and the over-light part of the fuel will be in thermal type NO because of the over-large air quantity, low combustion temperaturexThe amount of production is also reduced. In summary, when the thick/thin burner of the present embodiment is used for combustion, NO is generatedxIs lower than that of conventional combustion, so that NO can be reducedxWhile reducing ammonia slip.
In addition, the thick and thin burner is simple and compact, does not need special personnel training for use, is convenient to install in the air preheater, can prolong the service life of the air preheater, and is low in investment cost and simple in later maintenance.
Drawings
FIG. 1 is a schematic view of a configuration of a rich-lean burner in an embodiment of the present invention;
fig. 2 is a front view of the ports of the rich-lean burner in the embodiment of the present invention.
Detailed Description
In order to make the technical means and functions of the present invention easy to understand, the present invention is specifically described below with reference to the embodiments and the accompanying drawings.
Example (b):
fig. 1 is a schematic view of a configuration of a rich-lean burner in an embodiment of the present invention.
As shown in fig. 1, the rich-lean burner 100 of the present embodiment is connected to a primary air duct to perform rich-lean separation of a primary air pulverized coal stream, and the rich-lean burner 100 includes: pulverized coal enters the pipe 10, the horizontal main pipe 20, the nozzle 30 and the bluff body member 40.
One end of each of the two coal powder inlet pipelines 10 is a coal powder inlet, and the other ends of the two coal powder inlet pipelines are mutually crossed to enable the two coal powder inlet pipelines to be V-shaped.
The horizontal main pipe 20 is connected with the intersection of the two pulverized coal inlet pipes 10, the upper side and the lower side of the inside are provided with guide plates 201, the part between the guide plates 201 on the two sides is a pulverized coal main pipe 202, and the outside is a pulverized coal auxiliary pipe 203.
The horizontal main pipe 20 is connected with the pulverized coal inlet pipe 10 by a 150-degree round chamfer 50, and the round chamfer enables the concentration of pulverized coal on two sides of the horizontal main pipe to be lower than the central concentration, so that primary concentration and dilution separation of the pulverized coal are completed.
In this embodiment, the horizontal main pipe 20 is connected to the coal powder inlet pipe 10 by the 150 ° round chamfer 50, so that the coal powder has inertia to inject into the main pipe, and simultaneously the coal powder in the upper and lower two coal powder pipes will be offset by the speed in the vertical direction due to the angle and the conservation of momentum, and the speed in the horizontal direction will be accelerated, so as to offset the influence of the deceleration caused by the increase of the cross-sectional area at the outlet of the rich-lean burner 100, and in addition, the coal powder particles will concentrate at the central part of the coal powder main pipe 202 by the larger particles when entering the coal powder main pipe 202 due to the larger momentum inertia.
The flow guide plate 201 is close to one side of the pulverized coal inlet pipeline 10 and forms an angle of 120-150 degrees with the incoming flow direction of the pulverized coal, and is used for separating low-concentration pulverized coal on two sides of the pulverized coal main pipeline 202 and enabling the low-concentration pulverized coal to enter the pulverized coal auxiliary pipeline 203.
In this embodiment, the deflector 201 can guide out the pulverized coal on both sides of the main pipeline of the pulverized coal 202 without affecting the main flow field.
In this embodiment, the pulverized coal entering the pulverized coal secondary pipe 203 is in a lean flow with high oxygen atmosphere during the combustion process due to its low concentration, thereby reducing thermal NOxIs performed.
Fig. 2 is a front view of the ports of the rich-lean burner in the embodiment of the present invention.
As shown in fig. 2, the jet 30 is trumpet-shaped and is connected to a baffle 201.
The plurality of blunt members 40 have a regular hexagonal shape, and the number thereof is related to the area of the nozzle 30, and when the area of the nozzle 30 is large, the number of blunt members 40 is large, and when the area of the nozzle 30 is small, the number of blunt members 40 is small.
In this embodiment, the number of the blunt body members 40 is 10, the surface of the nozzle 30 is rectangular, the blunt body members 40 are evenly distributed along four sides of the nozzle 30, and the blunt body members 40 are distributed around the outlet end of the nozzle 30 to form a bypass core area around the nozzle, so that the entrainment capacity of primary air jet flow is increased, the primary air jet flow is rapidly ignited, and the ignition heat of pulverized coal airflow is further reduced.
In this embodiment, the nozzle 30 enlarges the sectional area of the outlet and the coal dust particles have great momentum inertia, so that the coal dust can not be completely diffused to the periphery of the nozzle when leaving the nozzle, and the part of the coal dust has too much air, so that the thermal NO is generatedxThe production amount is reduced, so that the coal powder at the nozzle 30 has high middle concentration and low surrounding concentration, and the concentration separation is further completed.
Effects and effects of the embodiments
According to the rich-lean burner related to the embodiment, because the horizontal main pipe and the coal powder inlet pipe are in a 150-degree round chamfer, coal powder can be injected into the coal powder main pipe at an included angle of 150 degrees, meanwhile, because coal powder particles have larger inertia, the coal powder particles can be concentrated to the central part of the coal powder main pipe, so that the concentration of the middle coal powder is higher, and at two sides of the coal powder main pipe, the concentration of the coal powder is lower, a preliminary rich-lean separation effect is generated, and because the angle and the momentum conservation thereof enable the coal powder in the upper coal powder pipe and the lower coal powder pipe to mutually impact, the speed in the vertical direction can be offset, the speed in the horizontal direction can be accelerated, so as to offset the influence of; because the angle between the horizontal main pipeline and the pulverized coal inlet pipeline is the round chamfer, the flow field of pulverized coal can be more uniform when the pulverized coal is introduced into the pulverized coal main pipeline, the pipeline abrasion is reduced, and meanwhile, compared with connection with a sharp corner, the existence of the round chamfer can enable the streamline of the pulverized coal in the pulverized coal pipeline, which enters the main pipeline, to be more uniform; because the side of the flow guide plate close to the pulverized coal inlet pipeline has a certain angle with the incoming flow direction of the pulverized coal, the pulverized coal main pipeline can be used for conveying the pulverized coal without influencing the flow field of the pulverized coal main pipelineThe low-concentration coal dust on two sides of the pipeline is led into the coal dust auxiliary pipeline, so that the part of coal dust is over-large in air quantity and low in combustion temperature, and the thermal NO is reducedxThe amount of production of (c); the nozzle is trumpet-shaped, so the sectional area of the outlet is enlarged, and the pulverized coal particles have great momentum inertia and cannot be completely diffused to the periphery of the nozzle when leaving the nozzle, so that the concentration of the pulverized coal around the nozzle is low, and the pulverized coal has overlarge air amount and low combustion temperature, so that the thermal NO is further generatedxThe generated amount of the coal is reduced, and simultaneously, because the coal powder at the middle part has high concentration and is burnt in an oxygen-deficient environment, NO can be reducedxAnd the high-concentration coal powder can reduce ignition heat and improve ignition stability.
According to the thick and thin burner related to the embodiment, the regular hexagon blunt body components are distributed at the periphery of the near outlet end of the nozzle, so that the regular hexagon blunt body components can form a flow winding core area around the nozzle, and the entrainment capacity of the primary air jet flow is increased to ensure that the primary air jet flow quickly catches fire.
Therefore, when combustion is performed by the rich-lean burner of the rich embodiment, the combustion temperature is not high due to insufficient oxygen in the fuel rich portion, and therefore, the fuel type NO is usedxAnd thermal NOxWill be reduced, and the over-light part of the fuel will be in thermal type NO because of the over-large air quantity, low combustion temperaturexThe amount of production is also reduced. In summary, when the thick/thin burner of the present embodiment is used for combustion, NO is generatedxIs lower than that of conventional combustion, so that NO can be reducedxWhile reducing ammonia slip.
In addition, the dense-dilute burner of the embodiment is simple and compact, does not need to carry out special personnel training during use, is convenient to install in the air preheater, can also prolong the service life of the air preheater, and has low investment cost and simple post maintenance.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.
Claims (3)
1. A rich-lean burner, comprising:
the coal dust inlet pipe comprises two coal dust inlet pipes, one end of each coal dust inlet pipe is a coal dust inlet, and the other ends of the coal dust inlet pipes are mutually crossed to enable the two coal dust inlet pipes to be V-shaped;
the horizontal main pipeline is connected with the intersection of the two pulverized coal inlet pipelines, the upper side and the lower side of the interior of the horizontal main pipeline are provided with flow guide plates, the part between the flow guide plates on the two sides is the pulverized coal main pipeline, and the exterior of the horizontal main pipeline is a pulverized coal auxiliary pipeline;
the nozzle is horn-shaped and is connected with the guide plate; and
a plurality of bluff body components which are distributed around the nozzle near the outlet end and are used for forming a flow winding core area around the nozzle, thereby increasing the entrainment capacity of the primary air jet flow and leading the primary air jet flow to catch fire rapidly,
wherein the horizontal main pipeline is connected with the coal powder inlet pipeline in a 150-degree round chamfer angle, the round chamfer angle enables the coal powder concentration at two sides of the horizontal main pipeline to be lower than the central concentration, thereby completing the primary concentration separation of the coal powder,
one side of the flow guide plate close to the pulverized coal inlet pipeline forms an angle of 120-150 degrees with the incoming flow direction of the pulverized coal, and the flow guide plate is used for separating low-concentration pulverized coal at two sides of the main pulverized coal pipeline and allowing the low-concentration pulverized coal to enter the auxiliary pulverized coal pipeline,
the spout makes the buggy can not spread to the border fast to make the buggy of spout department middle concentration is high, and concentration is low all around, has further accomplished the shade separation.
2. The rich-lean burner of claim 1, wherein:
wherein the shape of the bluff body member is a regular hexagon.
3. The rich-lean burner of claim 1, wherein:
wherein the surface of the nozzle is rectangular, and a plurality of the blunt body components are evenly distributed along the four sides of the nozzle.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010088208.9A CN111237750B (en) | 2020-02-12 | 2020-02-12 | Thick-thin burner |
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| CN202010088208.9A CN111237750B (en) | 2020-02-12 | 2020-02-12 | Thick-thin burner |
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| CN111237750A true CN111237750A (en) | 2020-06-05 |
| CN111237750B CN111237750B (en) | 2021-12-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114932019A (en) * | 2022-07-25 | 2022-08-23 | 中国空气动力研究与发展中心低速空气动力研究所 | Method for controlling expansion angle of rectangular jet flow |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114932019A (en) * | 2022-07-25 | 2022-08-23 | 中国空气动力研究与发展中心低速空气动力研究所 | Method for controlling expansion angle of rectangular jet flow |
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| Publication number | Publication date |
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| CN111237750B (en) | 2021-12-24 |
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