CN113432117A - Pulverized coal boiler system for blending and burning ammonia gas and ammonia-blending and burning method - Google Patents

Pulverized coal boiler system for blending and burning ammonia gas and ammonia-blending and burning method Download PDF

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Publication number
CN113432117A
CN113432117A CN202110888620.3A CN202110888620A CN113432117A CN 113432117 A CN113432117 A CN 113432117A CN 202110888620 A CN202110888620 A CN 202110888620A CN 113432117 A CN113432117 A CN 113432117A
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China
Prior art keywords
ammonia
pulverized coal
combustion
burner
ammonia gas
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CN202110888620.3A
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Chinese (zh)
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韩志江
陈文强
李月华
闫凯
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Shanghai Boiler Works Co Ltd
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Shanghai Boiler Works Co Ltd
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Priority to CN202110888620.3A priority Critical patent/CN113432117A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C5/00Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
    • F23C5/08Disposition of burners
    • F23C5/24Disposition of burners to obtain a loop flame
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23QIGNITION; EXTINGUISHING-DEVICES
    • F23Q3/00Igniters using electrically-produced sparks

Abstract

The invention provides a pulverized coal boiler system for blending and burning ammonia and a blending and burning method thereof, relating to the technical field of fuel burning and comprising an ammonia/pulverized coal burning part and an ammonia burnout area which are arranged on a boiler; the ammonia/coal powder combustion part comprises a coal powder combustion area and an ammonia/coal powder combustion area, and the ammonia/coal powder combustion area comprises an ammonia/coal powder burner on the corner and an ammonia burner on the wall; when the ammonia blending combustion proportion is gradually increased, firstly putting the ammonia burner on the wall, and then putting the ammonia/pulverized coal burner on the corner; firstly putting the ammonia gas/pulverized coal burner on the upper corner and/or the ammonia gas burner on the wall, and then putting the ammonia gas/pulverized coal burner on the lower corner and/or the ammonia gas burner on the wall; according to the invention, the pulverized coal in the pulverized coal combustion area is controlled to be in a non-complete combustion state, CO is provided for the upper ammonia gas/pulverized coal combustion area during ammonia gas combustion, so that the ammonia gas is easier to combust, and the SOFA area and the SNCR denitration equipment are arranged above the ammonia gas burnout area, so that the emission of NOx can be reduced.

Description

Pulverized coal boiler system for blending and burning ammonia gas and ammonia-blending and burning method
Technical Field
The invention belongs to the technical field of fuel combustion, and particularly relates to a pulverized coal boiler system for blending combustion of ammonia gas and an ammonia-blending combustion method.
Background
In recent years, the global economy trend of ' low carbon ' is increasingly strengthened, and each main economy in the world is successively added with ' Paris ' agreement ', and corresponding carbon emission reduction targets and plans are formulated. As the second major economic body in the world, China sets up a carbon emission peak reaching action scheme before 2030 years, strives for reaching a peak value before 2030 years, and realizes carbon neutralization before 2060 years. The utilization of 'zero carbon' fuel instead of traditional fossil fuel is one of the effective carbon emission reduction modes.
The coal powder combustion technology is widely applied, the research on the combustion characteristic and the NOx emission characteristic is tested by long-term engineering practice at home and abroad, and the relevant technology is mature, but the problem of reducing the carbon emission of the coal powder combustion technology needs to be considered when the coal powder combustion technology faces the trend of low carbonization. Ammonia gas (NH)3) Is a good carrier of hydrogen energy compared with hydrogen gas (H)2) The main advantages of ammonia are high hydrogen content and high volumetric energy density, which are even higher per unit volume than liquid hydrogen. Meanwhile, the fuel is easy to liquefy, convenient to store and transport, high in safety and the like due to the mature production process, is considered to be a more potential clean fuel, and can be effectively used as a carrier of hydrogen and energy. However, there are two very significant problems associated with its direct combustion as a fuel: poor combustion characteristics and high NOx emissions.
At present, most of research on ammonia gas combustion is concentrated on an internal combustion engine and a pulverized coal cyclone burner, and the research on the ammonia gas combustion is less in technical development of blending and burning ammonia gas of a pulverized coal boiler with four tangential points and circles and less in technical development of blending and burning ammonia gas in a large proportion, so that the provision of the pulverized coal boiler system for blending and burning the ammonia gas and the ammonia gas combustion method are very important.
Disclosure of Invention
The invention aims to provide a pulverized coal boiler system for blending and burning ammonia gas and a blending and burning method for the pulverized coal boiler system, so as to solve the problems in the background technology.
In order to solve the technical problem, the invention provides a pulverized coal boiler system for blending combustion of ammonia, which comprises an ammonia/pulverized coal combustion part and an ammonia burnout area which are sequentially arranged on a boiler from bottom to top;
the ammonia/coal powder combustion part comprises a coal powder combustion area and an ammonia/coal powder combustion area, and the coal powder combustion area is positioned below the ammonia/coal powder combustion area;
the ammonia/pulverized coal combustion area comprises an ammonia/pulverized coal burner arranged on a corner of a boiler wall and a wall ammonia burner arranged on the boiler wall;
the ammonia/pulverized coal burner on the angle comprises an ammonia nozzle channel and a pulverized coal nozzle channel, and the ammonia nozzle channel is arranged in the pulverized coal nozzle channel;
the ammonia spout passageway includes the tertiary, spouts the ammonia passageway for the one-level in proper order, the ammonia passageway is spouted to the second grade and the tertiary ammonia passageway of spouting, the spout that the spout of the ammonia passageway was spouted to the one-level, the spout that the ammonia passageway was spouted to the second grade and the spout that the ammonia passageway was spouted to the tertiary are not in a plane, the ammonia passageway is spouted to the one-level in the ammonia passageway is spouted to the second grade, the ammonia passageway is spouted to the second grade is in the tertiary ammonia passageway of spouting.
The laminar flame combustion speed of ammonia gas is low, and experimental research shows that CO and H2When the gas and the ammonia gas are combusted together, the combustion speed of the laminar flame of the ammonia gas can be effectively improved, so that the ammonia gas is easier to combust. Therefore, the pulverized coal combustion area is arranged below the ammonia/pulverized coal combustion area, so that the pulverized coal combustion area is in a lean combustion state, the purpose is to provide CO for the ammonia/pulverized coal combustion area at the upper layer when ammonia combustion is carried out, the combustion of ammonia is promoted, a large amount of heat is provided for the ammonia combustion at the upper layer, and the combustion of ammonia is facilitated when the temperature of a hearth is higher.
The upper part of the boiler is provided with an ammonia burnout zone, which aims to ensure the complete combustion of ammonia.
The invention mainly describes the parts for realizing ammonia-doped combustion in the four-corner tangential pulverized coal boiler, does not describe other related accessories on the boiler too much, and is common knowledge in the field.
Furthermore, the number of the ammonia/pulverized coal combustion parts is more than two, and the installation height of the ammonia/pulverized coal burner on the boiler on the corner of each ammonia/pulverized coal combustion part is the same as the installation height of the ammonia burner on the boiler on the wall.
A guard burning zone is arranged on a furnace wall at a place where ammonia is sprayed, if the height of the guard burning zone is inconsistent, the arrangement area of the guard burning zone is too large, when the mixed burning amount of the ammonia is small, most of the area where the guard burning zone is arranged is coal dust burning, the temperature of a hearth is too high, the generation amount of thermal NOx is more, and therefore the installation height of the ammonia/coal dust burner on the boiler at a corner is the same as the installation height of the ammonia burner on the boiler on the wall.
The arrangement of the plurality of ammonia/pulverized coal combustion parts aims to prevent the ammonia from being burnt difficultly due to the fact that the temperature of a hearth is locally too low when the ammonia is intensively mixed and burnt in a large proportion.
The wall ammonia gas burner is used for ammonia gas combustion quantity when less, so a plasma igniter is not needed, the combustion improver is high-temperature secondary air, ammonia gas and secondary air are mixed and then put into a hearth, the wall ammonia gas burner is not limited to be arranged in the middle of a hearth wall, but also can be arranged at other positions, but the two wall ammonia gas burners on opposite surfaces are in central symmetry relation, and an included angle between the wall ammonia gas burner and the hearth wall can adopt a vertical hearth wall as required, or along the rotating direction of a coal powder tangent circle, or against the rotating direction of the coal powder tangent circle.
When ammonia is burned in the corner ammonia/pulverized coal burner and the wall ammonia burner, it is first heated to the same temperature as the secondary air and then mixed with the secondary air.
Furthermore, a SOFA area is arranged above the ammonia burnout area, SNCR denitration equipment for denitration is arranged above the SOFA area, and pulverized coal burners are arranged on the ammonia burnout area and the pulverized coal combustion area on the boiler.
An SNCR denitration device is arranged at the upper part of the hearth, and the aim is to reduce NOx emission.
The SOFA area is a separated over-fire air area, and the main combustion area of the combustor is in a lean combustion state by means of graded air supply, so that the flame temperature is reduced, the generation of thermal NOx can be reduced, and meanwhile, the sufficient combustion of coal powder can be ensured.
Further, the primary ammonia spraying channel comprises a primary ammonia pipeline and an oxygen pipeline, and the primary ammonia pipeline is positioned inside the oxygen pipeline;
the secondary ammonia spraying channel comprises a secondary ammonia pipeline and a primary secondary air pipeline, and the secondary ammonia pipeline is positioned inside the primary secondary air pipeline;
the tertiary ammonia passageway includes tertiary ammonia pipeline and second grade overgrate air pipeline, tertiary ammonia pipeline is located the inside of second grade overgrate air pipeline.
Further, a plasma igniter is arranged at a nozzle of the primary ammonia spraying channel;
the ammonia nozzle channel and the coal powder nozzle channel share one set of plasma igniter.
The utility model discloses a burning device of ammonia in the ammonia pipeline of most inlayer one-level ammonia pipeline, including the ammonia spout passageway in the angle of utilization ammonia/buggy combustor and the pulverized coal of utilization spout passageway in the angle of utilization when burning the ammonia and the pulverized coal of utilization spout passageway share one set of plasma ignition combustor, this needs to carry out special transformation to ordinary pulverized coal combustor, and the ammonia also adopts the mode of lighting in grades here, and for guaranteeing the good burning of ammonia, the combustion improver of ammonia is the pure oxygen in inlayer one-level ammonia pipeline, and the combustion improver of ammonia is the high temperature overgrate air in second grade ammonia pipeline and the tertiary ammonia pipeline. When a large proportion of ammonia is mixed and burned, the ammonia/coal powder burner is put into the angle, wherein oxygen is obtained by air-liquid separation during ammonia synthesis.
The ammonia gas nozzle channel can be set to three stages or more stages, and the ammonia gas nozzle channel is designed to be the optimum stage by considering the factors of ensuring stable combustion of ammonia gas, comprehensively considering economic benefits and the like.
The method for carrying out ammonia-doped combustion by using the pulverized coal boiler system for doping and combusting ammonia comprises the steps of opening all or part of a wall ammonia burner for ammonia combustion when the ammonia doping and combusting ratio is 0-20%, closing an ammonia nozzle channel of an ammonia/pulverized coal burner at an angle, and opening a pulverized coal nozzle channel;
and when the ammonia gas blending combustion ratio is 20-60%, opening all or part of the ammonia gas nozzle channels of the ammonia gas/pulverized coal burners at the corners for ammonia gas combustion.
The wall ammonia gas burner and the angle ammonia gas/coal powder burner are specifically put into the wall ammonia gas burner and the angle ammonia gas/coal powder burner in such a way that when the ammonia gas blending proportion is gradually increased, the priority is that the wall ammonia gas burner is put into the wall ammonia gas burner firstly and then the angle ammonia gas/coal powder burner is put into the wall ammonia gas burner later; when a plurality of ammonia/coal powder combustion parts are arranged, the ammonia/coal powder burners on the upper corners and/or the ammonia burners on the wall are put into the ammonia/coal powder burners on the lower corners and/or the ammonia burners on the wall.
The blending proportion of the ammonia gas is calculated according to the lower calorific value generated by fuel combustion.
Further, when an ammonia nozzle channel of the ammonia/pulverized coal burner at the corner is opened for ammonia combustion, the pulverized coal nozzle channel is closed; and when the coal powder nozzle channel of the ammonia/coal powder burner at the corner is opened for coal powder combustion, closing the ammonia nozzle channel.
Further, when opening an ammonia nozzle channel of an ammonia gas burner on the wall and an ammonia gas/pulverized coal burner on the corner for ammonia gas combustion, the air coefficient near the ammonia gas is 1-1.15;
when the pulverized coal burner on the ammonia burnout area and the pulverized coal burning area and the pulverized coal nozzle channel of the ammonia/pulverized coal burner on the corner are opened for pulverized coal burning, the air coefficient near the pulverized coal is 0.65-0.75.
The air factor is defined as the ratio of the amount of air actually supplied to the amount of air theoretically required.
In order to ensure that the pulverized coal can provide enough CO during combustion, namely the pulverized coal is controlled to be insufficiently combusted, the air coefficient near the pulverized coal is 0.65-0.75, and the air coefficient is determined according to the proportion of the input ammonia.
To ensure good ignition characteristics of ammonia gas, the air factor near the ammonia gas nozzle is 1 to 1.15.
Has the advantages that:
(1) the invention provides a pulverized coal boiler system for blending combustion of ammonia, which comprises an ammonia/pulverized coal combustion part and an ammonia burnout area which are sequentially arranged on a boiler from bottom to top; the ammonia/coal powder combustion part comprises a coal powder combustion area and an ammonia/coal powder combustion area, and the ammonia/coal powder combustion area comprises an ammonia/coal powder burner arranged on the corner of the wall corner of the boiler and a wall ammonia burner arranged on the wall surface of the boiler; the pulverized coal is controlled to be in a non-complete combustion state in the pulverized coal combustion area, more CO is provided for the ammonia/pulverized coal combustion area on the upper layer when ammonia is combusted, the ammonia is easier to combust, a burning prevention belt is laid on a furnace wall where the ammonia/pulverized coal combustion area of the boiler is located, the temperature of a combustion area is guaranteed, the ammonia burnout area is arranged on the upper part of the boiler, the complete combustion of the ammonia is guaranteed, the SOFA area is arranged above the ammonia burnout area, the generation of thermal NOx can be reduced, and the emission of NOx in a hearth can be reduced by arranging the SNCR denitration equipment.
(2) According to the pulverized coal boiler system for co-combustion of ammonia, ammonia gas/pulverized coal burners on design corners are sprayed into ammonia gas in multiple stages, mixed gas can be gradually ignited, and the situation that ammonia gas is introduced once and an igniter cannot ignite is prevented; in addition, through setting up a plurality of ammonia/buggy combustion portions, can prevent that when the large proportion concentrates to mix and burns the ammonia, lead to the local low ammonia of furnace temperature to be difficult to burn, and set up the buggy combustion area in the below of ammonia/buggy combustion area, control buggy combustion area is the lean combustion state, can provide CO for the ammonia/buggy combustion area of upper strata when carrying out the ammonia burning, promote the burning of ammonia, provide a large amount of heats for the ammonia burning of upper strata simultaneously, when furnace temperature is higher, be favorable to the burning of ammonia.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a schematic structural diagram of an ammonia-doped pulverized coal fired boiler system according to the present invention;
FIG. 2 is a schematic diagram of the arrangement of the corner ammonia/pulverized coal burners and the wall ammonia burners in the ammonia/pulverized coal combustion zone of a boiler according to the present invention;
FIG. 3 is a schematic view showing an alternative arrangement of the corner ammonia/pulverized coal burners and the wall ammonia burners in the ammonia/pulverized coal combustion zone of the boiler according to the present invention;
FIG. 4 is a schematic structural view of an ammonia gas nozzle passage in the embodiment;
FIG. 5 is a side view of an ammonia gas ejection opening passage in the embodiment;
description of the drawings:
1. an ammonia/pulverized coal combustion part; 11. an ammonia/coal powder combustion zone; 12. a pulverized coal combustion zone; 111. corner ammonia/coal burners; 1111. a primary ammonia gas pipeline; 1112. an oxygen pipeline; 1113. a secondary ammonia gas pipeline; 1114. a primary secondary air duct; 1115. a tertiary ammonia pipeline; 1116. a secondary air duct; 1117. a plasma igniter; 112. a wall ammonia gas burner; 121. a pulverized coal burner; 2. an ammonia burnout zone; 3. a SOFA region; 4. SNCR denitration equipment;
the dashed lines in the drawings are additional lines added to better describe the structure of the present application and do not actually exist.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.
Example (b):
as shown in fig. 1 to 5, in a preferred embodiment, an ammonia-doped pulverized coal fired boiler system is provided, which includes an ammonia/pulverized coal combustion part 1 and an ammonia burnout zone 2, which are sequentially disposed on a boiler from bottom to top;
the ammonia/coal powder combustion part 1 comprises a coal powder combustion area 12 and an ammonia/coal powder combustion area 11, and the coal powder combustion area 12 is positioned below the ammonia/coal powder combustion area 11;
the ammonia/pulverized coal combustion area 11 comprises an ammonia/pulverized coal burner 111 arranged on the corner of the boiler wall and a wall ammonia burner 112 arranged on the boiler wall;
in this embodiment, the angled ammonia/pulverized coal burner 111 includes an ammonia nozzle channel and a pulverized coal nozzle channel, and the ammonia nozzle channel is inside the pulverized coal nozzle channel and is ignited by a plasma igniter;
as shown in fig. 4 and 5, the ammonia gas nozzle channel includes three stages, from left to right, a first-stage ammonia spraying channel, a second-stage ammonia spraying channel and a third-stage ammonia spraying channel are sequentially provided, the nozzle of the first-stage ammonia spraying channel, the nozzle of the second-stage ammonia spraying channel and the nozzle of the third-stage ammonia spraying channel are not in the same plane, the first-stage ammonia spraying channel is in the second-stage ammonia spraying channel, and the second-stage ammonia spraying channel is in the third-stage ammonia spraying channel.
The laminar flame combustion speed of ammonia gas is low, and experimental research shows that CO and H2When the gas and the ammonia gas are combusted together, the combustion speed of the laminar flame of the ammonia gas can be effectively improved, so that the ammonia gas is easier to combust. Therefore, the pulverized coal combustion zone 12 is arranged below the ammonia/pulverized coal combustion zone 11, and the pulverized coal combustion zone is controlled to be in a lean combustion state, so that the purpose is to provide CO for the ammonia/pulverized coal combustion zone 11 at the upper layer during ammonia combustion, promote ammonia combustion, and provide a large amount of heat for the ammonia combustion at the upper layer, and when the temperature of the hearth is higher, the combustion of ammonia is facilitated.
The upper part of the boiler is provided with an ammonia burnout zone, which aims to ensure the complete combustion of ammonia.
The invention mainly describes components for realizing ammonia-doped combustion in a four-corner tangential pulverized coal boiler, does not describe other related accessories on the boiler too much, is common knowledge in the field, and in addition, the boiler is divided into different areas in order to clearly describe the technical scheme of the application.
In this embodiment, the number of the ammonia/pulverized coal combustion portions 1 is two, each ammonia/pulverized coal combustion portion 1 includes four ammonia/pulverized coal burners 111 arranged at corners of a boiler wall and four ammonia burners 112 arranged on walls of the boiler wall, four of the ammonia/pulverized coal burners 111 arranged at corners of the boiler wall are respectively located at four corners of the ammonia/pulverized coal combustion area 11 of the boiler wall, four of the ammonia burners 112 arranged on the walls are respectively located on four walls of the ammonia/pulverized coal combustion area 11 of the boiler wall, and each of the ammonia/pulverized coal combustion area 11 is provided with the same mounting height of the ammonia/pulverized coal burners 111 on the boiler and the same mounting height of the ammonia burners 112 on the boiler wall at the corners.
A guard burning zone is arranged on a furnace wall at the ammonia gas spraying place, if the height of the guard burning zone is inconsistent, the arrangement area of the guard burning zone is too large, when the ammonia gas mixed burning amount is small, most of the area where the guard burning zone is arranged is pulverized coal burning, the temperature of a hearth is too high, the generation amount of thermal NOx is more, and therefore the installation height of the ammonia gas/pulverized coal burner 111 on a corner of the boiler is the same as the installation height of the ammonia gas burner 112 on the wall of the boiler.
The arrangement of the plurality of ammonia/pulverized coal combustion parts 1 aims to prevent the ammonia from being burnt difficultly due to the fact that the temperature of a hearth is locally too low when the ammonia is intensively mixed and burnt in a large proportion.
And a burning guarding belt is arranged on the furnace wall where the ammonia gas/coal powder burning part 1 is positioned.
An ammonia/buggy combustion area 11 is last to set up ammonia/buggy combustor 111 and four on the wall ammonia combustors on four angles, when being used for the ammonia combustion volume less, so do not need plasma igniter, the combustion-supporting agent is the high temperature overgrate air, the ammonia drops into furnace after mixing with the overgrate air, not only be restricted to arranging in the middle of the furnace wall, also can arrange in other positions, but each other is the ammonia combustor on two walls on the opposite face and is central symmetry relation, the contained angle between ammonia combustor and the furnace wall on the wall can adopt perpendicular furnace wall as required, perhaps along the direction of rotation of buggy tangent circle, perhaps the direction of rotation against buggy tangent circle.
Fig. 2 shows the ammonia gas burner on the wall placed in the middle of the furnace wall, and fig. 3 shows the ammonia gas burner on the wall placed in the middle of the furnace wall, but not in the furnace wall, in this embodiment, the included angle between the ammonia gas burner 112 on the wall and the furnace wall is 90 °.
The ammonia is combusted in the corner ammonia/pulverized coal burner 111 and the wall ammonia burner 112 by heating to the same temperature as the secondary air and then mixing with the secondary air.
An SOFA area 3 is arranged above the ammonia burnout area 2, an SNCR denitration device 4 for denitration is arranged above the SOFA area 3, and pulverized coal burners 121 are arranged on the ammonia burnout area 2 and the pulverized coal combustion area 12 on the boiler.
The ammonia burn-off zone 2 with pulverized coal burner 121 on the pulverized coal combustion zone 12 is located four corners of the boiler, wherein, on the pulverized coal combustion zone 12 pulverized coal burner 121 can set into multistage along the direction of height of the boiler on the corner of the boiler, and each stage includes four pulverized coal burner 121, in this embodiment, be located boiler upper portion in pulverized coal combustion zone 12 pulverized coal burner 121 designs into the one-level, sets up four and is located respectively on the boiler corner pulverized coal burner 121 is located the boiler lower part in pulverized coal combustion zone 12 pulverized coal burner 121 designs into the two-stage, sets up eight and is located respectively on the boiler corner pulverized coal burner 121.
An SNCR denitration device is arranged at the upper part of the hearth, and the aim is to reduce NOx emission.
The SOFA area 3 is a separated over-fire air area, and the main combustion area of the combustor is in a lean combustion state by means of graded air supply, so that the flame temperature is reduced, the generation of thermal NOx can be reduced, and meanwhile, the sufficient combustion of coal powder can be ensured.
The primary ammonia spraying channel comprises a primary ammonia pipeline 1111 and an oxygen pipeline 1112, and the primary ammonia pipeline 1111 is positioned inside the oxygen pipeline 1112;
the secondary ammonia spraying channel comprises a secondary ammonia pipeline 1113 and a primary secondary air pipeline 1114, and the secondary ammonia pipeline 1113 is positioned inside the primary secondary air pipeline 1114;
the tertiary ammonia gas channel comprises a tertiary ammonia gas pipeline 1115 and a secondary air pipeline 1116, and the tertiary ammonia gas pipeline 1115 is positioned inside the secondary air pipeline 1116.
A plasma igniter 1117 is arranged at the nozzle of the primary ammonia spraying channel;
the ammonia nozzle channel and the coal powder nozzle channel share the plasma igniter.
The ammonia combustion improver is pure oxygen in the innermost primary ammonia pipeline, and the ammonia combustion improver is high-temperature secondary air in the secondary ammonia pipeline and the tertiary ammonia pipeline. When a large proportion of ammonia is mixed and burned, the ammonia/coal powder burner is put into the angle, wherein oxygen is obtained by air-liquid separation during ammonia synthesis.
The ammonia gas nozzle channel can be set to three stages or more stages, and the ammonia gas nozzle channel is designed to be the optimum stage by considering the factors of ensuring stable combustion of ammonia gas, comprehensively considering economic benefits and the like.
The method for carrying out ammonia-doped combustion by using the pulverized coal boiler system for doping and combusting ammonia comprises the steps of opening all or part of the wall ammonia gas burner 112 for ammonia gas combustion when the ammonia gas doping and combusting ratio is 0-20%, closing an ammonia gas nozzle channel of the ammonia gas/pulverized coal burner 111 at the corner, and opening a pulverized coal nozzle channel;
and when the ammonia gas blending combustion ratio is 20-60%, opening all or part of the ammonia gas nozzle channels of the ammonia gas/pulverized coal burner 111 at the corners for ammonia gas combustion.
The wall ammonia gas burner and the angle ammonia gas/coal powder burner are specifically put into the wall ammonia gas burner and the angle ammonia gas/coal powder burner in such a way that when the ammonia gas blending proportion is gradually increased, the priority is that the wall ammonia gas burner is put into the wall ammonia gas burner firstly and then the angle ammonia gas/coal powder burner is put into the wall ammonia gas burner later; when a plurality of ammonia/pulverized coal combustion parts 1 are arranged, the ammonia/pulverized coal burners at the corners of the upper layer and/or the ammonia burners on the wall are put into firstly, and then the ammonia/pulverized coal burners at the corners of the lower layer and/or the ammonia burners on the wall are put into.
When the ammonia gas blending combustion proportion is 20-60%, the priority is that the ammonia gas/pulverized coal burner on the upper layer corner and/or the ammonia gas burner on the wall are firstly put into the ammonia gas/pulverized coal burner on the lower layer corner and/or the ammonia gas burner on the wall; however, the upper corner ammonia gas/pulverized coal burner and/or the wall ammonia gas burner are not required to be put into use when the upper corner ammonia gas/pulverized coal burner and/or the wall ammonia gas burner are all put into use, for example, in some special cases, the lower corner ammonia gas/pulverized coal burner is put into use before the upper corner ammonia gas/pulverized coal burner is put into use.
The blending proportion of the ammonia gas is calculated according to the lower calorific value generated by fuel combustion.
When the ammonia gas nozzle channel of the ammonia gas/pulverized coal burner 111 on the corner is opened for ammonia gas combustion, the pulverized coal nozzle channel is closed; when the pulverized coal nozzle channel of the ammonia/pulverized coal burner 111 at the corner is opened for pulverized coal combustion, the ammonia nozzle channel is closed, and ammonia combustion and pulverized coal combustion cannot be simultaneously performed.
When opening the ammonia gas nozzle channel of the ammonia gas burner on the wall and the ammonia gas/pulverized coal burner 111 on the corner for ammonia gas combustion, the air coefficient near the ammonia gas is 1-1.15;
when the pulverized coal burner 121 on the ammonia burnout zone 2 and the pulverized coal combustion zone 12 and the pulverized coal nozzle channel of the ammonia/pulverized coal burner 111 on the corner are opened for pulverized coal combustion, the air coefficient near pulverized coal or primary air is 0.65-0.75.
The air factor is defined as the ratio of the amount of air actually supplied to the amount of air theoretically required.
In order to ensure that the pulverized coal can provide enough CO during combustion, namely the pulverized coal is controlled to be insufficiently combusted, the air coefficient near the pulverized coal is 0.65-0.75, and the air coefficient is determined according to the proportion of the input ammonia.
To ensure good ignition characteristics of ammonia gas, the air factor near the ammonia gas nozzle is 1 to 1.15.
The nozzle of each ammonia pipeline of the ammonia gas burner and the ammonia gas/pulverized coal burner on the wall is provided with a plurality of small holes, the aperture range is 6-100 mm, and the aperture size and the number of the holes are determined according to the position and the actual ammonia amount. The ammonia pipeline nozzles are provided with a plurality of small holes which are not shown in the figure.
The mode that the ammonia spout passageway on the angle ammonia/pulverized coal burner spouts the ammonia burning does, send into furnace with the ammonia through one-level ammonia pipeline and outside two-layer second grade ammonia pipeline and tertiary ammonia pipeline in grades, the center of oxygen pipeline of pure oxygen is being led to the one-level ammonia pipeline, the ammonia of center one-level ammonia pipeline mixes with the pure oxygen earlier, then ignite through plasma igniter, accomplish first order burning, the ammonia in outer two-layer second grade ammonia pipeline and the tertiary ammonia pipeline mixes with the overgrate air in one-level overgrate air pipeline and the second grade overgrate air pipeline respectively, accomplish second grade burning and third level burning in proper order. The purpose of introducing pure oxygen into the oxygen pipeline is to enable the ammonia gas to be easier to burn, so as to promote the burning of the ammonia gas on the outer layer, and the pure oxygen is separated from liquefied air in the ammonia preparation process. The ammonia gas is sprayed in stages, the mixed gas can be gradually ignited, and the condition that the ammonia gas is introduced once and the igniter cannot be ignited is prevented. The ammonia nozzle channel is arranged in the pulverized coal nozzle channel, and aims to share the plasma igniter with pulverized coal, so that the modification cost is reduced; when the ammonia injection combustion is carried out by using the ammonia gas/pulverized coal burner on the corner, the injection of the pulverized coal and primary air in the pulverized coal nozzle channel is stopped, and the air volume of secondary air in the ammonia nozzle channel is adjusted.

Claims (8)

1. A pulverized coal boiler system for blending combustion of ammonia gas is characterized by comprising an ammonia gas/pulverized coal combustion part (1) and an ammonia gas burnout area (2) which are sequentially arranged on a boiler from bottom to top;
the ammonia/coal powder combustion part (1) comprises a coal powder combustion area (12) and an ammonia/coal powder combustion area (11), and the coal powder combustion area (12) is positioned below the ammonia/coal powder combustion area (11);
the ammonia/pulverized coal combustion area (11) comprises an ammonia/pulverized coal burner (111) arranged at the corner of the wall of the boiler and a wall ammonia burner (112) arranged on the wall of the boiler;
the ammonia/pulverized coal burner (111) on the corner comprises an ammonia nozzle channel and a pulverized coal nozzle channel, and the ammonia nozzle channel is arranged in the pulverized coal nozzle channel;
the ammonia spout passageway includes the tertiary, spouts the ammonia passageway for the one-level in proper order, the ammonia passageway is spouted to the second grade and the tertiary ammonia passageway of spouting, the spout that the spout of the ammonia passageway was spouted to the one-level, the spout that the ammonia passageway was spouted to the second grade and the spout that the ammonia passageway was spouted to the tertiary are not in a plane, the ammonia passageway is spouted to the one-level in the ammonia passageway is spouted to the second grade, the ammonia passageway is spouted to the second grade is in the tertiary ammonia passageway of spouting.
2. The ammonia-doped pulverized coal fired boiler system according to claim 1 wherein the number of the ammonia/pulverized coal combustion sections (1) is two or more, and the installation height of the ammonia/pulverized coal burners (111) on the boiler at the corners is the same as the installation height of the ammonia burners (112) on the boiler at the walls.
3. The ammonia-doped pulverized coal fired boiler system according to claim 1, wherein a SOFA (selective catalytic reduction) area (3) is arranged above the ammonia burnout area (2), an SNCR (selective non-catalytic reduction) denitration device (4) for denitration is arranged above the SOFA area (3), and pulverized coal burners (121) are arranged on the ammonia burnout area (2) and the pulverized coal combustion area (12) on the boiler.
4. The ammonia-doped pulverized coal fired boiler system as recited in claim 1, wherein the primary ammonia injection passage comprises a primary ammonia gas pipe (1111) and an oxygen gas pipe (1112), the primary ammonia gas pipe (1111) is located inside the oxygen gas pipe (1112);
the secondary ammonia spraying channel comprises a secondary ammonia pipeline (1113) and a primary secondary air pipeline (1114), and the secondary ammonia pipeline (1113) is positioned inside the primary secondary air pipeline (1114);
the tertiary ammonia channel comprises a tertiary ammonia pipeline (1115) and a secondary air pipeline (1116), and the tertiary ammonia pipeline (1115) is located inside the secondary air pipeline (1116).
5. The pulverized coal fired boiler system for co-firing ammonia gas as claimed in claim 4, wherein a plasma igniter (1117) is provided at a nozzle of the primary ammonia injection passage;
the ammonia gas nozzle channel and the coal powder nozzle channel share a plasma igniter (1117).
6. The method for carrying out ammonia-doped combustion by using the ammonia-doped pulverized coal fired boiler system according to claim 5, wherein when the ammonia-doped combustion ratio is 0-20%, all or part of the wall ammonia burners (112) are opened to carry out ammonia combustion, the ammonia nozzle channel of the ammonia/pulverized coal burners (111) at the corner is closed, and the pulverized coal nozzle channel is opened;
and when the ammonia gas blending combustion proportion is 20-60%, opening all or part of the ammonia gas nozzle channels of the ammonia gas/pulverized coal burner (111) at the corners for ammonia gas combustion.
7. The method for ammonia-doped combustion as set forth in claim 6, wherein when the ammonia gas spouting passage of the angled ammonia gas/pulverized coal burner (111) is opened for ammonia gas combustion, the pulverized coal spouting passage is closed; when the pulverized coal nozzle channel of the ammonia gas/pulverized coal burner (111) on the corner is opened for pulverized coal combustion, the ammonia gas nozzle channel is closed.
8. The method for ammonia-doped combustion as claimed in claim 7, wherein when the ammonia gas is combusted by opening the ammonia gas jet passage of the ammonia gas burner (112) on the wall and the ammonia gas/pulverized coal burner (111) on the corner, the air factor in the vicinity of the ammonia gas is 1 to 1.15;
when the pulverized coal burner nozzle channels of the ammonia gas/pulverized coal burner (111) at the corners of the pulverized coal burner (121) on the ammonia gas burnout zone (2) and the pulverized coal combustion zone (12) are opened for pulverized coal combustion, the air coefficient near the pulverized coal is 0.65-0.75.
CN202110888620.3A 2021-08-03 2021-08-03 Pulverized coal boiler system for blending and burning ammonia gas and ammonia-blending and burning method Pending CN113432117A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113944940A (en) * 2021-10-12 2022-01-18 中国矿业大学 Ammonia combustion utilization system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113944940A (en) * 2021-10-12 2022-01-18 中国矿业大学 Ammonia combustion utilization system

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