CN112413572A - Preheating combustion boiler with fuel flow controlled in rotary direction and control method thereof - Google Patents
Preheating combustion boiler with fuel flow controlled in rotary direction and control method thereof Download PDFInfo
- Publication number
- CN112413572A CN112413572A CN201910782011.2A CN201910782011A CN112413572A CN 112413572 A CN112413572 A CN 112413572A CN 201910782011 A CN201910782011 A CN 201910782011A CN 112413572 A CN112413572 A CN 112413572A
- Authority
- CN
- China
- Prior art keywords
- hearth
- preheat
- separator
- furnace
- burners
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
- F23C5/28—Disposition of burners to obtain flames in opposing directions, e.g. impacting flames
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
- F23C5/32—Disposition of burners to obtain rotating flames, i.e. flames moving helically or spirally
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/02—Disposition of air supply not passing through burner
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Of Fluid Fuel (AREA)
Abstract
The invention relates to a preheat combustion boiler, comprising a hearth and at least one pair of preheat burners, each pair of preheat burners being arranged opposite to each other on both sides of the hearth, respectively, each preheat burner comprising: a riser (3); a cyclone separator (5); a separator inlet pipe section (4) connected between the riser and the cyclone separator; the bottom outlet of the self-rotating air separator is connected to the lower part of the lifting pipe; a separator outlet duct section comprising a vertically arranged central cylinder (7) connected to the cyclone upper end outlet, and a furnace connecting duct (71) connected to the central cylinder and horizontally connected to the furnace, wherein: in one of the at least one pair of preheating burners, the connecting cut-in direction of the two separator inlet pipe sections and the corresponding cyclone separator is the same. The invention also relates to a combustion control method of the preheating combustion boiler.
Description
Technical Field
The embodiment of the invention relates to the field of boilers, in particular to a preheating combustion boiler and a control method thereof.
Background
Along with the development of economic society and the acceleration of urbanization in China, the composite pollution of the atmosphere in the middle east area is increasingly severe, wherein the proportion of the atmospheric pollutants discharged by industrial coal accounts for 30-40% of the haze source. The coal-fired industrial boiler has been widely applied to the fields of metallurgy, chemical industry, machinery, agriculture and the like by virtue of the advantages of quick response of steam parameter adjustment, flexible adjustment, wide range of operation parameters and the like. At present, the total number of coal-fired industrial boilers is about 60 thousands, the annual coal consumption amount reaches 6.4 hundred million tons, and the pulverized coal industrial boiler accounts for 85% of the total number of the existing industrial boilers and is increased at a rate of about 1.5% per year.
However, the existing coal-fired industrial boiler belongs to energy equipment with high energy consumption and high pollution, and the coal-fired industrial boiler in China always has the following technical defects: (1) unreasonable airflow organization, poor flame structure, propagation and control; (2) the original emission of the coal-fired pollutants is difficult to amplify and burn out; (3) the boiler is in low-load operation and has poor stability and low combustion efficiency. Therefore, under the national regulation and regulation for strictly controlling the emission of atmospheric pollutants, the development of high-efficiency burnout, low-pollutant emission and low-load stable combustion technology of the coal-fired industrial boiler has important significance.
The existing technical problems of the conventional pulverized coal industrial boiler with opposed burners mainly comprise: the pulverized coal industrial boiler arranged by the traditional opposed burner has the problems of serious asymmetric airflow rotation direction, inclined wall brushing, weaker fuel mixing, insufficient flame fullness and the like caused by poor air distribution, so that the prior NOx industrial boiler has high original emission, poor low-load combustion stability and low burnout degree, is easy to ablate and slag-bonding to damage the inner wall of a hearth particularly in high-load operation, and seriously influences the service life of the pulverized coal industrial boiler.
Disclosure of Invention
The present invention has been made to mitigate or solve at least one of the above-mentioned problems.
The invention mainly aims at the main technical defects of the medium and large-sized pulverized coal industrial boiler with the opposed arrangement of the burners, in particular to the defects of serious asymmetry and skew wall brushing, weak fuel mixing, insufficient flame fullness and the like of the airflow rotation direction of the medium and large-sized industrial boiler with the opposed arrangement of the burners, provides a scheme different from the conventional front and rear wall opposed arrangement of the burners, and is beneficial to realizing at least one of the following: the technical problems that the conventional opposed pulverized coal industrial boiler (1) is subjected to opposed rotational flow deflection wall brushing, (2) fuel mixing is weak, and (3) flame fullness is insufficient are solved, so that the safe and stable operation and the service life of the industrial boiler are improved.
According to an aspect of an embodiment of the present invention, there is provided a preheat combustion boiler including a furnace and at least one pair of preheat burners, each pair of preheat burners being disposed opposite to each other on both sides of the furnace, respectively, each preheat burner including:
a riser tube;
a cyclone separator;
the separator inlet pipe section is connected between the riser and the cyclone separator;
the bottom outlet of the self-rotating air separator is connected to the lower part of the lifting pipe;
the outlet pipe section of the separator comprises a vertically arranged central cylinder connected with an outlet at the upper end of the cyclone separator, and a hearth connecting pipe connected with the central cylinder and horizontally connected to a hearth,
wherein:
in one of the at least one pair of preheating burners, the connecting cut-in direction of the two separator inlet pipe sections and the corresponding cyclone separator is the same.
Optionally, a pipeline rotational flow strengthening structure is arranged in the hearth connecting pipeline. Optionally, the pipeline rotational flow strengthening structure comprises at least one spiral flow guiding structure. Optionally, the range of the helix angle α of the helical flow guide structure is as follows: alpha is more than or equal to 30 degrees and less than or equal to 60 degrees, and further, the helix angle alpha meets the condition that tan alpha is more than or equal to 0.6 and less than or equal to 1.5. Optionally, the at least one helical flow guide structure comprises three helical flow guide structures equally angularly spaced apart from each other in the circumferential direction. Optionally, the spiral flow guiding structure is a spiral flow guiding groove or a spiral flow guiding protrusion.
Optionally, a nozzle is arranged at one end of the hearth connecting pipeline connected with the hearth, and a nozzle rotational flow strengthening structure is arranged in the nozzle. Optionally, the nozzle swirl strengthening structure includes a plurality of baffles arranged in the nozzle, and a rotating flow passage is formed between adjacent baffles. Optionally, the nozzle swirl-enhancing structure comprises a central shaft member disposed in the middle of the nozzle, and the baffle is connected to the central shaft member. Optionally, each baffle has an involute shape in a cross section perpendicular to the axis of the spout. Optionally, the opening angle β of each baffle is: 0 ° < β <90 °.
Optionally, the relationship between the helix angle α and the opening angle β is 0.2 or more and sin α sin β or less and 0.8 or less, and sin α cos β or less and 0.3 or more and 1.0 or less.
Optionally, a tangent of any point of the baffle on the plane perpendicular to the axis of the nozzle is acute-angled to the screwing-out direction of the spiral flow guide structure.
Optionally, the two preheating burners are symmetrically arranged at the lower parts of the front wall and the rear wall of the hearth; the central lines of the nozzles of the two preheating burners are superposed with each other and pass through the center of the section of the horizontal hearth; or the nozzle centerlines of the two preheating burners are staggered by a distance of not more than 0.3D in the vertical direction and/or by a distance of not more than 0.1D in the horizontal direction, wherein D represents the outer diameter of the outlet end of the nozzle.
According to another aspect of an embodiment of the present invention, there is provided a preheat combustion boiler including a furnace and at least two pairs of preheat burners, each pair of preheat burners being disposed on both sides of the furnace, respectively, opposite to each other, each preheat burner including:
a riser tube;
a cyclone separator;
the separator inlet pipe section is connected between the riser and the cyclone separator;
the bottom outlet of the self-rotating air separator is connected to the lower part of the lifting pipe;
the outlet pipe section of the separator comprises a vertically arranged central cylinder connected with an outlet at the upper end of the cyclone separator, and a hearth connecting pipe connected with the central cylinder and horizontally connected to a hearth,
wherein, in two pairs of the at least two pairs of preheat burners:
the two separator inlet pipe sections of each pair of preheating burners which are arranged on two sides of the hearth and are opposite to each other are connected with the corresponding cyclone separators in opposite cutting directions; and is
And the connecting cut-in directions of the two separator inlet pipe sections of the two preheating burners arranged on the same side of the hearth in the two pairs of preheating burners and the corresponding cyclone separators are opposite.
Optionally, in the two pairs of preheating burners:
the two separator inlet pipe sections of each pair of preheating burners which are arranged on two sides of the hearth and are opposite to each other are arranged in mirror symmetry relative to the middle section of the corresponding first hearth; and the two separator inlet pipe sections of the two preheating burners arranged on the same side of the hearth in the two pairs of preheating burners are arranged in mirror symmetry with respect to the middle section of a second hearth vertically dividing the middle section of the first hearth; or
Each preheating burner is provided with a nozzle connected with a furnace connecting pipeline, the nozzle center lines of each pair of preheating burners which are arranged on two sides of the furnace and are opposite to each other are staggered in the vertical direction by a distance not more than 0.3D and/or staggered in the horizontal direction by a distance not more than 0.1D, and/or the nozzle center lines of two preheating burners arranged on the same side of the furnace are staggered in the vertical direction by a distance not more than 0.3D and/or staggered in the horizontal direction by a distance not more than 0.1D, wherein D represents the outer diameter of the outlet end of the nozzle.
The present invention also proposes, based on an embodiment of the present invention, a combustion control method of a preheat combustion boiler including a furnace and first and second preheat burners oppositely arranged on both sides of the furnace, each preheat burner including:
a riser tube;
a cyclone separator;
the separator inlet pipe section is connected between the riser and the cyclone separator;
the bottom outlet of the self-rotating air separator is connected to the lower part of the lifting pipe;
the outlet pipe section of the separator comprises a vertically arranged central cylinder connected with an outlet at the upper end of the cyclone separator, and a hearth connecting pipe connected with the central cylinder and horizontally connected to a hearth,
wherein the method comprises the steps of:
such that the direction of swirl of the fuel flow entering the furnace via the first preheating burner is different from the direction of swirl of the fuel flow entering the furnace via the second preheating burner, said direction of swirl being determined by the direction of cut-in of the connection of the separator inlet duct section with the corresponding cyclone separator.
Further optionally, at least one spiral flow guide structure is arranged in the hearth connecting pipeline, and the value range of the helix angle α of the spiral flow guide structure is as follows: alpha is more than or equal to 30 degrees and less than or equal to 60 degrees; the utility model discloses a burner, including furnace connecting pipe, spout whirl strengthening structure, rotatory runner is formed to a plurality of baffles that the furnace connecting pipe is connected in the one end of being connected with furnace, be provided with the spout whirl in the spout and strengthen the structure, the spout whirl is strengthened the structure and is formed rotatory runner including setting up a plurality of baffles in the spout between the adjacent baffle, and each baffle has the shape of gradually bursting at the seams in the cross-section of the axis of perpendicular to spout, and the value range of the opening angle beta: 0 ° < β <90 °; the method further comprises the steps of: so that the relationship between the helix angle alpha and the opening angle beta is more than or equal to 0.2 and less than or equal to 0.8 for sin alpha and sin beta and more than or equal to 0.3 and less than or equal to 1.0 for sin alpha and cos beta.
Based on an embodiment of the present invention, the present invention also proposes a combustion control method of a preheat combustion boiler including a furnace and two pairs of preheat burners oppositely arranged on both sides of the furnace, each preheat burner including:
a riser tube;
a cyclone separator;
the separator inlet pipe section is connected between the riser and the cyclone separator;
the bottom outlet of the self-rotating air separator is connected to the lower part of the lifting pipe;
the outlet pipe section of the separator comprises a vertically arranged central cylinder connected with an outlet at the upper end of the cyclone separator, and a hearth connecting pipe connected with the central cylinder and horizontally connected to a hearth,
wherein the method comprises the steps of:
so that the direction of rotation of the fuel flow entering the furnace via one preheating burner is the same as the direction of rotation of the fuel flow entering the furnace via the other preheating burner in the two preheating burners arranged in pairs, said direction of rotation being determined by the direction of cut-in of the connection of the separator inlet duct section with the corresponding cyclone.
In the above method, further comprising the step of: different furnace connecting pipes are switched to change the helix angle alpha.
Drawings
FIG. 1 is a schematic front view of a preheat combustion boiler in accordance with an exemplary embodiment of the present invention;
FIG. 2 is a schematic top view of the preheat combustion boiler of FIG. 1;
FIG. 3 is a schematic view of a furnace connecting duct according to an exemplary embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of the furnace connecting duct of FIG. 3;
FIG. 5 is a schematic view of a spout configuration according to an exemplary embodiment of the present invention;
FIG. 6 is a schematic view of a sub-hearth connection pipe according to another exemplary embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view of the furnace connecting duct of FIG. 6;
fig. 8 is a schematic structural view of a preheat combustion boiler in accordance with an exemplary embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the general inventive concept of the present invention and should not be construed as limiting the invention.
The invention solves or relieves the problems of asymmetric airflow rotation direction, inclined wall brushing, poor fuel mixing strength, insufficient flame fullness and the like caused by unreasonable air distribution of the pulverized coal boiler through the arrangement mode of the preheating burners and the preheating combustion boiler adopting the arrangement mode of the preheating burners.
FIG. 1 is a schematic front view of a preheat combustion boiler in accordance with an exemplary embodiment of the present invention; FIG. 2 is a schematic top view of the preheat combustion boiler of FIG. 1; FIG. 3 is a schematic view of a furnace connecting duct according to an exemplary embodiment of the present invention; FIG. 4 is a schematic cross-sectional view of the furnace connecting duct of FIG. 3; fig. 5 is a schematic view of a spout configuration according to an exemplary embodiment of the present invention.
As shown in fig. 1-2, the pre-heating combustion boiler or pulverized coal boiler according to the present invention includes a furnace 2, pre-heating burners 1A and 1B, a separator outlet duct section (including a furnace connection duct 71) communicating the pre-heating burners and the furnace, and a nozzle 72.
1-4, in an exemplary embodiment, the preheat burner arrangement of the present invention involves two preheat burners 1A, 1B, a furnace 2 and a separator outlet duct section and nozzle 72 that communicates the preheat burners 1A, 1B with the furnace. Wherein, the two preheating burners are symmetrically arranged on two opposite side walls of the lower area of the hearth, and the central lines of the nozzles are mutually superposed and pass through the center of the section of the hearth; each of the preheating burners 1A and 1B includes a riser 3, a separator inlet pipe section 4 connected with the riser 3, a cyclone separator 5, a material returning device 6 connected with an outlet at the bottom of the cyclone separator 5, and a central cylinder 7 connected with an outlet at the upper end of the cyclone separator 5.
As shown in fig. 2, the separator inlet pipe sections 4 of the two symmetrically arranged preheating burners 1A and 1B entering the cyclone separator 5 can be arranged in a manner of cutting in clockwise or counterclockwise, that is, the cutting directions of the two burners are the same, and the burners are clockwise or counterclockwise.
In the present invention, the term "connection cut-in direction" means that, in a top view of the preheating burner, the gas flow of the separator inlet duct section 4 enters the cyclone separator 5 in a clockwise or counterclockwise direction, i.e. there are two connection cut-in directions, clockwise and counterclockwise respectively.
Due to the different cutting directions of the connections, the air flow in the furnace connecting duct 71 will have different directions of rotation. In the present invention, the rotation direction refers to the rotation direction of the airflow in the furnace section perpendicular to the axis of the furnace connecting duct 71 or the axis of the nozzle, and the rotation direction of the airflow includes both clockwise and counterclockwise directions. When the cross section is viewed in a direction perpendicular to the cross section (i.e., on an extension of the axis of the furnace connecting duct 71) on the same cross section, the two air flows have the same or different turning directions, i.e., clockwise or counterclockwise, and clockwise or counterclockwise when viewed at different times.
Swirl-enhancing structures, such as grooves (see, e.g., fig. 3 and 4), protrusions (see, e.g., fig. 6 and 7), and other structures, may be disposed in the furnace connecting duct 71 or the nozzle 72.
In one embodiment, as shown in fig. 3-4, the inner wall of the hearth connecting pipe 71 is poured with refractory material, and a swirl reinforcement structure is provided therein, the structure is at least one flow guiding swirl-retaining groove 711, and the flow guiding swirl-retaining groove is of a spiral structure. As shown in fig. 3, the lift angle α of the flow guiding rotation-maintaining groove is between 30 ° and 60 °, for example, 30 °, 40 °, 50 °, or 60 °. And the lift angle of the flow-guiding rotation-protecting groove is defined as an included angle between a tangent line of the spiral line and a plane perpendicular to the axis of the thread.
In the present invention, the spiral direction of the flow guiding rotation maintaining groove 711 is designed to be the same as the direction of the preheating rotation air flow.
The flow guiding rotation retaining groove 711 can also be replaced by a flow guiding rotation retaining protrusion 712 poured with refractory material. FIG. 6 is a schematic view of a sub-hearth connection pipe according to another exemplary embodiment of the present invention; fig. 7 is a schematic cross-sectional view of the furnace connecting duct of fig. 6, and a flow guide rotation-protection protrusion 712 is shown in fig. 6 and 7.
In one embodiment, as shown in FIG. 5, the nozzle 72 may be provided with a swirl-enhancing member provided with a reinforcing core (or centerpiece, which may be a central core) 721 and a baffle 722. In a further embodiment, the baffle 722 is of an involute configuration. The opening angle beta of the shutter 722 may be between 0-90 deg., for example 5 deg., 45 deg., or 80 deg.. The opening angle β of the swirl-enhancing member may be defined as the angle between a line perpendicular to the diameter of the nozzle passing through the intersection point of the central part 721 and the baffle 722 and the tangent of the baffle at this intersection point, as shown in fig. 5. The intersection point here may be the intersection point of the center piece and the baffle plates as described above, or may be the central convergence point of all the baffle plates in the case where the center piece is not provided.
In the present invention, the tangent of the baffle 722 at any point on the plane perpendicular to the axis of the nozzle is designed to be at an acute angle to the preheated swirling air flow.
In the invention, the jet rotation degree, diffusion strength and airflow rigidity of high-temperature fuel sprayed into a hearth 2 by preheating burners are adjusted by adjusting the angle of a diversion rotation-protection groove 711 in a hearth connecting pipeline 71 or/and the angle of a swirl flow strengthening member baffle 722 in a nozzle 72, and when the width of the hearth wall surface where two preheating burners are positioned is larger and the diffusion strength needs to be enlarged, a smaller lift angle alpha of the diversion rotation-protection groove can be selected and/or a smaller opening angle beta of the baffle 722 can be selected; when the nozzles of the two preheating burners are far away and the air flow strength needs to be improved, a larger lift angle alpha of the flow guiding rotation-protecting structure and/or an opening angle beta of the baffle 722 can be selected.
For the angle of the diversion rotation-maintaining groove 711 in the hearth connecting pipe 71, in the design and processing stage, the design is generally carried out according to the required high-temperature fuel injection speed, diffusion strength and airflow rigidity, wherein alpha is generally between 30 and 60 degrees, and alpha is further limited to meet the requirement that tan alpha is not less than 0.6 and not more than 1.5, wherein the smaller tan alpha is, the smaller the axial speed of the fuel along a nozzle is, the larger diffusion strength is, the smaller airflow rigidity is, and the diversion rotation-maintaining groove is suitable for a hearth with a smaller length-width ratio with the hearth (wherein the nozzle is arranged on the wide side of the section of the; on the contrary, the larger the tan alpha is, the larger the axial speed of the nozzle is, the smaller the diffusion strength is, and the larger the airflow rigidity is, so that the nozzle is suitable for a hearth with a larger length-width ratio with the hearth. The design criteria for the flow-guiding rotation-protecting protrusion 712 are similar.
In the design scheme including both the flow guiding rotation-protecting groove 711 and the rotation flow strengthening member baffle 722, the following design basis is provided: the helix angle alpha and the opening angle beta satisfy the relationship of sin alpha sin beta being more than or equal to 0.2 and less than or equal to 0.8, and sin alpha cos beta being more than or equal to 0.3 and less than or equal to 1.0. By adopting the design basis, the flame fullness can reach 0.5-0.9 when the load of the boiler is 30% -100%.
In an exemplary embodiment of the present invention, when fuel, boiler load, etc. are changed, since the furnace connection duct 71 has a simple structure and is easy to manufacture, the pitch angle α can be adjusted by switching/replacing the furnace connection duct 71.
Primary air can be fed from the bottom of a lifting pipe 3 of the preheating burner, carbon-based fuel (such as coal dust, semicoke, carbon residue and the like) is added from the lifting pipe, high-temperature coal gas and pyrolytic coal coke at the temperature of 800-950 ℃ are provided through the gasification combustion process of the fuel in the preheating burners 1A and 1B, and are symmetrically conveyed along front and rear walls to enter a main combustion area of a hearth for full combustion.
In the preheating combustion boiler shown in fig. 1-2, at least one layer of secondary air inlet 8 is arranged on the hearth, and an over-fire air inlet 9 can be arranged. As shown in FIG. 1, burners 1A and 1B arranged on the front and rear walls of a furnace belong to the circulating fluidized bed preheating burners. As shown in FIG. 2, the nozzle centerlines of the two preheating burners 1A and 1B arranged on the front and rear walls are coincident with each other and pass through the center of the furnace section.
For example, referring to fig. 1-2, in the embodiment of the present invention, in the preheating combustion boiler of the present invention, in the one-side burner 1A, the preheated fuel of the preheating burner riser tube 3 enters the cyclone 5 of the burner through the inlet pipe section 4 of the separator, the preheated fuel separated by the cyclone 5 maintains the rotating and diffusing characteristics in the central cylinder 7 and the hearth connecting pipe 71, and the high-temperature gas-solid fuel is injected into the hearth 2 through the nozzle rotating jet to be mixed and fully combusted; in the combustor 1B on the other side, the high-temperature gasified fuel in the riser tube 3 enters the cyclone separator in a centrosymmetric arrangement mode with the combustor 1A about the center of the section of the hearth, and enters the hearth 2 after going through the same process as that in 1); due to the fact that the cutting angles of the inlet pipe sections 4 of the preheating burner separators are different, the preheating burners 1A and 1B arranged on the front wall and the rear wall generate rotating diffusion air flows with opposite rotating directions, the two air flows with opposite rotating directions are spread in opposite directions in the hearth 2 in a colliding mode and spread in a radial mode, and the hearth air flow and the flame fullness are effectively improved.
Therefore, in the embodiment of the present invention, the preheating burner performs low excess air ratio preheating gasification combustion on pulverized coal, semi coke, carbon residue and other fuels, the high temperature preheating fuel generated by the preheating burner enters the furnace 2 to be fully combusted, the two preheating burners are symmetrically arranged in the lower regions of the front and rear walls of the furnace to form opposite high temperature swirling air flow and flame, because the cyclone inlet tube sections 4 of the two symmetrical preheating burners 1A and 1B are symmetrically arranged around the center of the horizontal furnace section where the cyclone inlet tube sections 4 are located (for example, in fig. 2, the intersection point of the horizontal dotted line and the longitudinal dotted line can be considered as being regarded as being the center), the preheated fuel is jetted out from the furnace connecting pipe 71 and the jet nozzle 72 to form strong diffusion swirling air flow, the two swirling air flows are opposite in the depth direction of the furnace, and the two air flows are opposite in opposite directions (i.e. the swirling directions when the air flows meet each other, or opposite in direction of rotation in the cross section of the furnace perpendicular to the axis of the furnace connecting duct 71) which is more rigid when entering the furnace and also has a strong diffusivity over the width of the furnace, compared to the airflow generated by a conventional pulverized coal burner; meanwhile, under the regulation effect of the hearth connecting pipeline 71 and the nozzle 72 on the flow, the swirling strength of the two air flows is very close, the two front and rear wall opposed rotating air flows are in strong forward impact collision, the peripheral diffusion is more uniform and strong, and the symmetrical distribution is better, so that the filling degree of the high-temperature fuel flame in the hearth can reach above 2/3 on the premise of meeting the requirement that the volume heat load and the section heat load in the furnace are the same. Meanwhile, the swirl degree of the airflow at the outlet of the preheating burner is adjusted by adjusting the flow guide swirl-protecting groove of the hearth connecting pipeline 71 and the swirl strengthening member of the nozzle 72, the rotational propagation performance of the impinging flame is improved, the impinging airflow deviating from the symmetric center and scouring of the side wall can be prevented or reduced, the side wall is protected from scouring and coking, and the symmetric airflow, sufficient rotational rigidity and sufficient mixing of the airflow and the flame fullness of the high-temperature fuel combustion are ensured.
It should be noted that although in the embodiment of FIG. 2, the two cyclone inlet sections 4 are in the same horizontal plane and the axes of the furnace connecting pipes 71 or the nozzle axes coincide, the invention is not limited thereto and the axes of the two furnace connecting pipes 71 or the nozzle axes may be vertically offset by a distance of not more than 0.3D, or the axes of the two furnace connecting pipes 71 or the nozzle axes may be horizontally offset by a distance of not more than 0.1D, where D represents the outer diameter of the outlet ends of the nozzles.
In the embodiment of fig. 1-2, only two preheating burners are provided. But the invention is not limited thereto. Fig. 8 is a schematic structural view of a preheat combustion boiler in accordance with an exemplary embodiment of the present invention, and fig. 8 shows a case where two sets of four preheat burner arrangements are arranged in pairs.
As shown in fig. 8, the separator inlet duct sections 4 of the two opposed preheating burners are arranged in mirror symmetry with respect to the middle section of the furnace parallel to the front and rear walls (i.e. the first middle section of the furnace, corresponding for example to the vertical dashed line in fig. 8), the separator inlet duct sections 4 of the two preheating burners on the same wall side are distant from each other, and the two separator inlet duct sections 4 of the two preheating burners arranged on the same side of the furnace are arranged symmetrically with respect to the second middle section of the furnace vertically bisecting the first middle section of the furnace (corresponding for example to the transverse dashed line in fig. 8, which passes through the longitudinal dashed line at the midpoint of the portion within the furnace). The two groups of four preheating burners adopt the arrangement mode, so that four preheating air flows can impact and spread to the center of the section of the hearth and the flame fullness of the section of the hearth is ensured.
It should be noted that although in the embodiment of fig. 8, the two oppositely-directed cyclone inlet pipe sections 4 are in the same horizontal plane and the axes of the furnace connecting pipes 71 are coincident, the present invention is not limited thereto, and the axes of the two furnace connecting pipes 71 or the axes of the nozzles may be vertically offset by a distance of not more than 0.3D, or the axes of the two furnace connecting pipes 71 or the axes of the nozzles may be horizontally offset by a distance of not more than 0.1D, where D represents the outer diameter of the outlet ends of the nozzles. The above-mentioned offset distances of the inlet pipe sections 4 of the two sets of oppositely-directed cyclone separators can also be matched to one another.
For the scheme of the arrangement of the multiple groups of preheating burners in the opposite direction, the problems of deflection and insufficient fullness of flame in a hearth can be solved according to the mode of combining the scheme of the arrangement of the two groups of four cyclone separators in the opposite direction with the scheme of the arrangement of one group in the opposite direction. In other words, the arrangement of fig. 2 and 8 may be combined.
It should be noted that although the embodiment of the present invention is described by taking pulverized coal as an example, the preheating burner of the present invention can be applied to other fuels capable of being preheated in a small particle or pulverized form, and these are within the scope of the present invention.
Based on the above, for example, referring to fig. 1-2, the present invention proposes the following technical solutions:
a preheat combustion boiler comprising a furnace and at least one pair of preheat burners, each pair of preheat burners being disposed opposite each other on either side of the furnace, respectively, each preheat burner comprising:
a riser (3);
a cyclone separator (5);
a separator inlet pipe section (4) connected between the riser and the cyclone separator;
the bottom outlet of the self-rotating air separator is connected to the lower part of the lifting pipe;
a separator outlet pipe section which comprises a vertically arranged central cylinder (7) connected with an outlet at the upper end of the cyclone separator and a hearth connecting pipe (71) connected with the central cylinder and horizontally connected to the hearth,
wherein:
in one of the at least one pair of preheating burners, the connecting cut-in direction of the two separator inlet pipe sections and the corresponding cyclone separator is the same.
Based on the above, for example, referring to fig. 8, the present invention proposes the following technical solutions:
a preheat combustion boiler comprising a furnace and at least two pairs of preheat burners, each pair of preheat burners being disposed opposite each other on either side of the furnace, respectively, each preheat burner comprising:
a riser (3);
a cyclone separator (5);
a separator inlet pipe section (4) connected between the riser and the cyclone separator;
the bottom outlet of the self-rotating air separator is connected to the lower part of the lifting pipe;
a separator outlet pipe section which comprises a vertically arranged central cylinder (7) connected with an outlet at the upper end of the cyclone separator and a hearth connecting pipe (71) connected with the central cylinder and horizontally connected to the hearth,
wherein, in two pairs of the at least two pairs of preheat burners:
the two separator inlet pipe sections of each pair of preheating burners which are arranged on two sides of the hearth and are opposite to each other are connected with the corresponding cyclone separators in opposite cutting directions; and is
And the connecting cut-in directions of the two separator inlet pipe sections of the two preheating burners arranged on the same side of the hearth in the two pairs of preheating burners and the corresponding cyclone separators are opposite.
Correspondingly, the invention also provides the following combustion control method:
1. a combustion control method of a preheat combustion boiler including a furnace and first and second preheat burners oppositely disposed at both sides of the furnace, each preheat burner comprising:
a riser (3);
a cyclone separator (5);
a separator inlet pipe section (4) connected between the riser and the cyclone separator;
the bottom outlet of the self-rotating air separator is connected to the lower part of the lifting pipe;
a separator outlet pipe section which comprises a vertically arranged central cylinder (7) connected with an outlet at the upper end of the cyclone separator and a hearth connecting pipe (71) connected with the central cylinder and horizontally connected to the hearth,
wherein the method comprises the steps of:
such that the direction of swirl of the fuel flow entering the furnace via the first preheating burner is different from the direction of swirl of the fuel flow entering the furnace via the second preheating burner, said direction of swirl being determined by the direction of cut-in of the connection of the separator inlet duct section with the corresponding cyclone separator.
2. A combustion control method of a preheat combustion boiler including a furnace and two pairs of preheat burners oppositely disposed at both sides of the furnace, each preheat burner comprising:
a riser (3);
a cyclone separator (5);
a separator inlet pipe section (4) connected between the riser and the cyclone separator;
the bottom outlet of the self-rotating air separator is connected to the lower part of the lifting pipe;
a separator outlet pipe section which comprises a vertically arranged central cylinder (7) connected with an outlet at the upper end of the cyclone separator and a hearth connecting pipe (71) connected with the central cylinder and horizontally connected to the hearth,
wherein the method comprises the steps of:
so that the direction of rotation of the fuel flow entering the furnace via one preheating burner is the same as the direction of rotation of the fuel flow entering the furnace via the other preheating burner in the two preheating burners arranged in pairs, said direction of rotation being determined by the direction of cut-in of the connection of the separator inlet duct section with the corresponding cyclone.
The opposed arrangement mode of the preheating burner can help to overcome at least one of the technical defects of asymmetry of airflow rotation direction, inclined wall brushing, weak mixing, insufficient flame fullness and the like of the opposed arrangement burner of the existing medium and large industrial boiler, thereby achieving at least one of the technical effects of improving the rotational symmetry of opposed airflow, improving the rigidity and the mixing strength of opposed rotating airflow, increasing the fullness of flame in a hearth and the like.
Although embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments and combinations of elements without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.
Claims (21)
1. A preheat combustion boiler comprising a furnace and at least one pair of preheat burners, each pair of preheat burners being disposed opposite each other on either side of the furnace, respectively, each preheat burner comprising:
a riser (3);
a cyclone separator (5);
a separator inlet pipe section (4) connected between the riser and the cyclone separator;
the bottom outlet of the self-rotating air separator is connected to the lower part of the lifting pipe;
a separator outlet pipe section which comprises a vertically arranged central cylinder (7) connected with an outlet at the upper end of the cyclone separator and a hearth connecting pipe (71) connected with the central cylinder and horizontally connected to the hearth,
wherein:
in one of the at least one pair of preheating burners, the connecting cut-in direction of the two separator inlet pipe sections and the corresponding cyclone separator is the same.
2. The preheat combustion boiler of claim 1, wherein:
and a pipeline rotational flow strengthening structure is arranged in the hearth connecting pipeline.
3. The preheat combustion boiler of claim 2, wherein:
the pipeline rotational flow strengthening structure comprises at least one spiral flow guide structure.
4. The preheat combustion boiler of claim 3, wherein:
the range of the helix angle alpha of the spiral diversion structure is as follows: alpha is more than or equal to 30 degrees and less than or equal to 60 degrees.
5. The preheat combustion boiler of claim 4, wherein:
the helix angle alpha satisfies the condition that tan alpha is more than or equal to 0.6 and less than or equal to 1.5.
6. The preheat combustion boiler of claim 3, wherein:
the at least one helical flow guide structure includes three helical flow guide structures equally angularly spaced apart from each other in a circumferential direction.
7. The preheat combustion boiler of any one of claims 3-6, wherein:
the spiral flow guide structure is a spiral flow guide groove or a spiral flow guide bulge.
8. The preheat combustion boiler of any one of claims 1-7, wherein:
the hearth connecting pipeline is provided with a nozzle at one end connected with the hearth, and a nozzle rotational flow strengthening structure is arranged in the nozzle.
9. The preheat combustion boiler of claim 8, wherein:
the spout rotational flow strengthening structure comprises a plurality of baffles arranged in the spout, and a rotary flow channel is formed between every two adjacent baffles.
10. The preheat combustion boiler of claim 9, wherein:
the spout swirl enhancing structure includes a central shaft member disposed in the middle of the spout, and the baffle is connected to the central shaft member.
11. The preheat combustion boiler of claim 9, wherein:
each baffle has an involute shape in a cross section perpendicular to the axis of the spout.
12. The preheat combustion boiler of claim 11, wherein:
the opening angle β of each baffle has a range of values: 0 ° < β <90 °.
13. The preheat combustion boiler of claim 12, wherein:
the range of the helix angle alpha of the spiral diversion structure is as follows: alpha is more than or equal to 30 degrees and less than or equal to 60 degrees; and is
The relationship between the helix angle alpha and the opening angle beta is more than or equal to 0.2 and less than or equal to 0.8 for sin alpha and sin beta and more than or equal to 0.3 and less than or equal to 1.0 for sin alpha and cos beta.
14. The preheat combustion boiler of claims 9-13, wherein:
the tangent line of any point of the baffle on the plane perpendicular to the axis of the nozzle and the screwing-out direction of the spiral flow guide structure form an acute angle.
15. The preheat combustion boiler of any one of claims 1-14, wherein:
the hearth connecting pipeline is provided with a nozzle at one end connected with the hearth, and the two preheating burners are symmetrically arranged at the lower parts of the front wall and the rear wall of the hearth; and is
The central lines of the nozzles of the two preheating burners are superposed with each other and pass through the center of the section of the horizontal hearth; or the nozzle centerlines of the two preheating burners are staggered by a distance of not more than 0.3D in the vertical direction and/or by a distance of not more than 0.1D in the horizontal direction, wherein D represents the outer diameter of the outlet end of the nozzle.
16. A preheat combustion boiler comprising a furnace and at least two pairs of preheat burners, each pair of preheat burners being disposed opposite each other on either side of the furnace, respectively, each preheat burner comprising:
a riser (3);
a cyclone separator (5);
a separator inlet pipe section (4) connected between the riser and the cyclone separator;
the bottom outlet of the self-rotating air separator is connected to the lower part of the lifting pipe;
a separator outlet pipe section which comprises a vertically arranged central cylinder (7) connected with an outlet at the upper end of the cyclone separator and a hearth connecting pipe (71) connected with the central cylinder and horizontally connected to the hearth,
wherein, in two pairs of the at least two pairs of preheat burners:
the two separator inlet pipe sections of each pair of preheating burners which are arranged on two sides of the hearth and are opposite to each other are connected with the corresponding cyclone separators in opposite cutting directions; and is
And the connecting cut-in directions of the two separator inlet pipe sections of the two preheating burners arranged on the same side of the hearth in the two pairs of preheating burners and the corresponding cyclone separators are opposite.
17. The preheat combustion boiler of claim 16, wherein:
two pairs of preheating burners:
the two separator inlet pipe sections of each pair of preheating burners which are arranged on two sides of the hearth and are opposite to each other are arranged in mirror symmetry relative to the middle section of the corresponding first hearth; and the two separator inlet pipe sections of the two preheating burners arranged on the same side of the hearth in the two pairs of preheating burners are arranged in mirror symmetry with respect to the middle section of a second hearth vertically dividing the middle section of the first hearth; or
Each preheating burner is provided with a nozzle connected with a furnace connecting pipeline, the nozzle center lines of each pair of preheating burners which are arranged on two sides of the furnace and are opposite to each other are staggered in the vertical direction by a distance not more than 0.3D and/or staggered in the horizontal direction by a distance not more than 0.1D, and/or the nozzle center lines of two preheating burners arranged on the same side of the furnace are staggered in the vertical direction by a distance not more than 0.3D and/or staggered in the horizontal direction by a distance not more than 0.1D, wherein D represents the outer diameter of the outlet end of the nozzle.
18. A combustion control method of a preheat combustion boiler including a furnace and first and second preheat burners oppositely arranged at both sides of the furnace, each preheat burner comprising:
a riser (3);
a cyclone separator (5);
a separator inlet pipe section (4) connected between the riser and the cyclone separator;
the bottom outlet of the self-rotating air separator is connected to the lower part of the lifting pipe;
a separator outlet pipe section which comprises a vertically arranged central cylinder (7) connected with an outlet at the upper end of the cyclone separator and a hearth connecting pipe (71) connected with the central cylinder and horizontally connected to the hearth,
wherein the method comprises the steps of:
such that the direction of swirl of the fuel flow entering the furnace via the first preheating burner is different from the direction of swirl of the fuel flow entering the furnace via the second preheating burner, said direction of swirl being determined by the direction of cut-in of the connection of the separator inlet duct section with the corresponding cyclone separator.
19. The method of claim 18, wherein:
at least one spiral flow guide structure is arranged in the hearth connecting pipeline, and the value range of the helix angle alpha of the spiral flow guide structure is as follows: alpha is more than or equal to 30 degrees and less than or equal to 60 degrees;
the utility model discloses a burner, including furnace connecting pipe, spout whirl strengthening structure, rotatory runner is formed to a plurality of baffles that the furnace connecting pipe is connected in the one end of being connected with furnace, be provided with the spout whirl in the spout and strengthen the structure, the spout whirl is strengthened the structure and is formed rotatory runner including setting up a plurality of baffles in the spout between the adjacent baffle, and each baffle has the shape of gradually bursting at the seams in the cross-section of the axis of perpendicular to spout, and the value range of the opening angle beta: 0 ° < β <90 °;
the method further comprises the steps of: so that the relationship between the helix angle alpha and the opening angle beta is more than or equal to 0.2 and less than or equal to 0.8 for sin alpha and sin beta and more than or equal to 0.3 and less than or equal to 1.0 for sin alpha and cos beta.
20. A combustion control method of a preheat combustion boiler including a furnace and two pairs of preheat burners oppositely arranged on both sides of the furnace, each preheat burner comprising:
a riser (3);
a cyclone separator (5);
a separator inlet pipe section (4) connected between the riser and the cyclone separator;
the bottom outlet of the self-rotating air separator is connected to the lower part of the lifting pipe;
a separator outlet pipe section which comprises a vertically arranged central cylinder (7) connected with an outlet at the upper end of the cyclone separator and a hearth connecting pipe (71) connected with the central cylinder and horizontally connected to the hearth,
wherein the method comprises the steps of:
so that the direction of rotation of the fuel flow entering the furnace via one preheating burner is the same as the direction of rotation of the fuel flow entering the furnace via the other preheating burner in the two preheating burners arranged in pairs, said direction of rotation being determined by the direction of cut-in of the connection of the separator inlet duct section with the corresponding cyclone.
21. The method of claim 18 or 20, wherein:
at least one spiral flow guide structure is arranged in the hearth connecting pipeline, and the value range of the helix angle alpha of the spiral flow guide structure is as follows: alpha is more than or equal to 30 degrees and less than or equal to 60 degrees;
the method comprises the following steps: different furnace connecting pipes are switched to change the helix angle alpha.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910782011.2A CN112413572B (en) | 2019-08-23 | 2019-08-23 | Preheating combustion boiler with fuel flow with rotation direction control function and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910782011.2A CN112413572B (en) | 2019-08-23 | 2019-08-23 | Preheating combustion boiler with fuel flow with rotation direction control function and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112413572A true CN112413572A (en) | 2021-02-26 |
| CN112413572B CN112413572B (en) | 2023-07-21 |
Family
ID=74779337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910782011.2A Active CN112413572B (en) | 2019-08-23 | 2019-08-23 | Preheating combustion boiler with fuel flow with rotation direction control function and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112413572B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114263905A (en) * | 2021-12-23 | 2022-04-01 | 中国科学院工程热物理研究所 | Preheating fuel gasification nozzle |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101936525A (en) * | 2010-09-27 | 2011-01-05 | 上海交通大学 | Low NOx rotational flow coal dust combustion device of industrial boiler |
| CN202660537U (en) * | 2012-06-28 | 2013-01-09 | 广东石油化工学院 | Double-cyclone combustion cylinder anthracite duff combustion equipment |
| CN104791775A (en) * | 2015-04-10 | 2015-07-22 | 中国科学院工程热物理研究所 | Vertical pulverized coal boiler with burner arranged at bottom |
| CN204593367U (en) * | 2015-03-12 | 2015-08-26 | 苏州吉杰电力科技有限公司 | Boiler spatial offset swirl flow combustion system |
| CN105444198A (en) * | 2014-07-29 | 2016-03-30 | 中国科学院工程热物理研究所 | Self-preheating device and method for pulverized fuel, and pulverized fuel combustion boiler system |
-
2019
- 2019-08-23 CN CN201910782011.2A patent/CN112413572B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101936525A (en) * | 2010-09-27 | 2011-01-05 | 上海交通大学 | Low NOx rotational flow coal dust combustion device of industrial boiler |
| CN202660537U (en) * | 2012-06-28 | 2013-01-09 | 广东石油化工学院 | Double-cyclone combustion cylinder anthracite duff combustion equipment |
| CN105444198A (en) * | 2014-07-29 | 2016-03-30 | 中国科学院工程热物理研究所 | Self-preheating device and method for pulverized fuel, and pulverized fuel combustion boiler system |
| CN204593367U (en) * | 2015-03-12 | 2015-08-26 | 苏州吉杰电力科技有限公司 | Boiler spatial offset swirl flow combustion system |
| CN104791775A (en) * | 2015-04-10 | 2015-07-22 | 中国科学院工程热物理研究所 | Vertical pulverized coal boiler with burner arranged at bottom |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114263905A (en) * | 2021-12-23 | 2022-04-01 | 中国科学院工程热物理研究所 | Preheating fuel gasification nozzle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112413572B (en) | 2023-07-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100451447C (en) | Combustion method of anthracite coal | |
| CN102230623B (en) | Flat combustion device | |
| CN112161261B (en) | Uniform-combustion corrosion-resistant anti-coking supercritical CO2Boiler and boiler system | |
| CN100464118C (en) | High temperature-and corrosion-protectal low NOx vortex burning device | |
| CN103727536A (en) | Multistage adjustable ultralow-nitrogen strong and weak rotational flow opposed-impact gas burner | |
| WO2019104614A1 (en) | Oxidant-multifuel burner capable of being used for solid fuel and gas fuel | |
| CN201025362Y (en) | A low nitrogen oxide vortex combustion device preventing from high temperature erosion | |
| CN105927969A (en) | Combustion system for reducing nitric oxides of front and back wall opposite-combustion boiler | |
| CN112413572A (en) | Preheating combustion boiler with fuel flow controlled in rotary direction and control method thereof | |
| CN207527582U (en) | The low nitrogen rotational flow gas-fired combustor of flue gas recirculation built in gas-air Accurate Classification | |
| CN110553249B (en) | Rotary preheating device and method for solid fuel | |
| CN103411215B (en) | Multidirectional jetting type vortex burner | |
| CN202328328U (en) | Biomass boiler | |
| CN103090406B (en) | Biomass boiler | |
| CN202132950U (en) | Flat combustion device | |
| WO2021043241A1 (en) | Pulverized coal boiler with bottom combustor, and control method therefor | |
| CN210069832U (en) | A hood for circulating fluidized bed boiler | |
| CN109724086B (en) | Oxygen-enriched multi-flame direct-current burner suitable for inferior coal | |
| CN207880840U (en) | A kind of single heat storage type burner | |
| CN111795383A (en) | Single gas staged burner | |
| CN204153769U (en) | Burner arch mouth, burner and combustion system | |
| US11493202B2 (en) | Supercritical CO2 boiler capable of realizing uniform combustion, corrosion resistance and coking resistance, and boiler system | |
| CN205560718U (en) | Circulating fluidized bed boiler soon burns by force in stove | |
| CN217423222U (en) | Air mixing device of low-nitrogen combustion coal-fired steam boiler | |
| CN217402533U (en) | Stable combustion structure of four-corner tangential combustion boiler |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |