CN216924410U - Pulverized coal separation structure and pulverized coal combustion system - Google Patents
Pulverized coal separation structure and pulverized coal combustion system Download PDFInfo
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- CN216924410U CN216924410U CN202220518260.8U CN202220518260U CN216924410U CN 216924410 U CN216924410 U CN 216924410U CN 202220518260 U CN202220518260 U CN 202220518260U CN 216924410 U CN216924410 U CN 216924410U
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- 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
Abstract
The utility model belongs to the technical field of coal-fired units, and discloses a pulverized coal separation structure and a pulverized coal combustion system. The coal dust separation structure comprises a separation part, a first transition part and a main body part, wherein a first flow cavity is arranged in the separation part, the inlet end of the first transition part is connected with the outlet end of the separation part, a second flow cavity communicated with the first flow cavity is arranged in the first transition part, the main body part comprises a first separation part and a second separation part, the first separation part is connected with the outlet end of the first transition part and sleeved outside the second separation part, a third flow cavity is arranged between the first separation part and the second separation part, a fourth flow cavity is arranged in the second separation part, the third flow cavity and the fourth flow cavity are respectively communicated with the second flow cavity, and the fourth flow cavity is arranged corresponding to the first flow cavity in the first direction. By using the pulverized coal separation structure, the problem of corrosion of the water-cooled wall due to high temperature can be reduced.
Description
Technical Field
The utility model relates to the technical field of coal-fired units, in particular to a pulverized coal separation structure and a pulverized coal combustion system.
Background
The low-nitrogen combustion improvement of the coal-fired unit approaches to the tail sound, and in order to pursue the low-nitrogen effect of the combustion in the furnace, a staged combustion strategy with high air over-combustion rate is generally adopted. Moreover, due to the particularity of the domestic coal market, many units can not continuously burn designed coal types, and because various conditions such as mixed combustion exist generally, the high over-fire air rate causes the risk that the side wall is easy to generate high-temperature corrosion, the pipe replacement amount is large during annual maintenance, and the economic and safe operation of the units is influenced.
The cyclone burners of a plurality of domestic coal-fired units are provided with exhaust gas separation structures, main gas is sent into a hearth for combustion through a main burner, and exhaust gas is introduced into a side wall through an exhaust gas pipeline for combustion, but because the temperature in the hearth is higher, the corrosion phenomenon of a water-cooled wall in the hearth can occur, and the service life and the reliability of the whole combustion device are reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a pulverized coal separating structure and a pulverized coal combustion system, which are used for at least solving the problem that a water-cooled wall in a furnace cavity of the existing combustion device is corroded due to high temperature.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a pulverized coal separating structure comprising:
a separation portion having a first flow chamber therein;
the inlet end of the first transition part is connected with the outlet end of the separation part, and a second flow cavity communicated with the first flow cavity is formed in the first transition part;
the main part, the main part includes first partition part and second partition part, first partition part connect in the exit end of first transition portion and the cover is located outside the second partition part, first partition part with third flow chamber has between the second partition part, fourth flow chamber has in the second partition part, third flow chamber with fourth flow chamber respectively with the second flow chamber is linked together, fourth flow chamber on the first direction with first flow chamber corresponds the setting.
In some embodiments of the present invention, the pulverized coal separation structure comprises a second transition portion, an outlet end of the second transition portion is connected with an inlet end of the separation portion, and the second transition portion has a fifth flow chamber therein, which is communicated with the first flow chamber.
In some embodiments of the utility model, the fifth flow chamber has a decreasing cross-sectional area along the first direction.
In some embodiments of the utility model, the second flow chamber has an increasing cross-sectional area in the first direction.
In some embodiments of the present invention, a bracket set is disposed between the first partition and the second partition, and the bracket set includes a plurality of fixing brackets disposed at intervals along the circumference of the second partition.
In some embodiments of the utility model, the inner diameter dimension of the separation portion is less than or equal to the inner diameter dimension of the second partition portion.
In some embodiments of the utility model, the centerline of the separation portion is coincident with the centerline of the second partition portion.
The utility model also provides a pulverized coal combustion system, comprising:
the furnace chamber is provided with a furnace chamber;
first combustion assembly, first combustion assembly includes buggy separation structure group, exhaust passage and locates respectively the cyclone burner group and the secondary bellows of furnace bottom, cyclone burner group embedded in the secondary bellows, the first exit end of cyclone burner group with the bottom of furnace chamber is linked together, the second exit end of cyclone burner group passes through the exhaust passage with the entrance point of buggy separation structure group is connected, the exit end of buggy separation structure group with the side of furnace chamber is linked together, buggy separation structure group includes a plurality of edges the buggy separation structure that the furnace lateral wall set up, buggy separation structure is foretell buggy separation structure.
In some embodiments of the present invention, the pulverized coal combustion system includes a second combustion assembly, the second combustion assembly is disposed at the top end of the furnace and has the same structure as the first combustion assembly, a first outlet end of the second combustion assembly is communicated with the top end of the furnace chamber, and a second outlet end of the second combustion assembly is communicated with a side end of the furnace chamber.
In some embodiments of the utility model, the cyclone burner group comprises a plurality of cyclone burners spaced apart in the second direction.
The utility model has the beneficial effects that:
by using the coal powder separation structure provided by the utility model, a combined form of the separation part, the first transition part and the main body part is adopted, the separation part can be used for primarily separating coal powder airflow at the outlet end of the separation part, due to different qualities of coal powder and air, the respective inertia of the coal powder and the air can be respectively kept when the coal powder airflow passes through the first transition part, so that most of the coal powder flows into a fourth flow cavity corresponding to the first flow cavity, part of the air can flow into a third flow cavity outside the second separation part, further secondary separation of the coal powder airflow is realized, finally, the concentrated coal powder airflow of the fourth flow cavity is led to the side end in the hearth for combustion, the light coal powder airflow of the third flow cavity flows along the water wall after entering the hearth and forms a wall-attached airflow, and further the problem that the water wall is corroded due to high temperature is reduced.
Drawings
FIG. 1 is a schematic view of the overall structure of a pulverized coal combustion system according to the present invention;
FIG. 2 is a schematic view of the overall structure of the coal dust separating structure of FIG. 1;
fig. 3 is a schematic sectional view of the pulverized coal separating structure of fig. 2.
In the figure:
100. a first combustion assembly; 10. a pulverized coal separation structure; 11. a separation section; 111. a first flow chamber; 12. a first transition portion; 121. a second flow chamber; 131. a first partition; 1311. a third flow chamber; 132. a second partition part; 1321. a fourth flow chamber; 133. fixing a bracket; 14. a second transition portion; 141. a fifth flow chamber; 20. a ventilation gas channel; 30. a secondary air box; 41. a cyclone burner;
200. a second combustion assembly;
300. a hearth; 301. a furnace chamber.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not to be construed as limiting the utility model. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Fig. 2 is a schematic view of the overall structure of the coal dust separating structure of fig. 1. Fig. 3 is a schematic sectional view of the coal dust separation structure of fig. 2. As shown in fig. 2 and 3, the pulverized coal separating structure 10 of the present invention includes a separating portion 11, a first transition portion 12 and a main body portion, the separating portion 11 has a first flow chamber 111 therein, an inlet end of the first transition portion 12 is connected to an outlet end of the separating portion 11, the first transition portion 12 has a second flow chamber 121 therein, the second flow chamber 121 is communicated with the first flow chamber 111, the main body portion includes a first partition portion 131 and a second partition portion 132, the first partition portion 131 is connected to the outlet end of the first transition portion 12 and is sleeved outside the second partition portion 132, a third flow chamber 1311 is provided between the first partition portion 131 and the second partition portion 132, the second partition portion 132 has a fourth flow chamber 1321 therein, the third flow chamber 1311 and the fourth flow chamber 1321 are respectively communicated with the second flow chamber 121, and the fourth flow chamber 1321 is disposed corresponding to the first flow chamber 111 in a first direction (i.e., an airflow direction).
By using the pulverized coal separation structure 10 of the present invention, in a combination form of the separation part 11, the first transition part 12 and the main body part, the separation part 11 can primarily separate the pulverized coal airflow at the outlet end of the separation part 11, due to the different mass of the pulverized coal and the air, the respective inertia of the pulverized coal and the air is maintained when the pulverized coal airflow passes through the first transition portion 12, so that most of the pulverized coal flows into the fourth flow chamber 1321 corresponding to the first flow chamber 111, part of the air flows to the third flow chamber 1311 outside the second partition 132, further realizing the secondary separation of the pulverized coal airflow, finally leading the concentrated pulverized coal airflow of the fourth flow chamber 1321 to the side end in the hearth 300 for combustion, so that the light pulverized coal flow of the third flow chamber 1311 flows along the water-cooled wall after entering the furnace 300 and forms a wall-attached flow, thereby reducing the problem of corrosion of the water-cooled wall due to high temperature.
In some embodiments of the present invention, as shown in fig. 2 and 3, the pulverized coal separating structure 10 includes a second transition portion 14, an outlet end of the second transition portion 14 is connected with an inlet end of the separating portion 11, and the second transition portion 14 has a fifth flow chamber 141 therein, which is communicated with the first flow chamber 111. In the present embodiment, the second transition portion 14 is used for transition connection between the separation portion 11 and the exhaust gas pipeline, and the fifth flow chamber 141 is used for conveying the pulverized coal gas flow in the exhaust gas pipeline into the first flow chamber 111 of the separation portion 11.
In some embodiments of the present invention, as shown in fig. 2 and 3, the cross-sectional area of the fifth flow chamber 141 decreases in the first direction. In this embodiment, the fifth flow chamber 141 is a frustum-shaped structure, and can extrude the pulverized coal airflow in the exhaust pipe, so as to accelerate the velocity of the pulverized coal airflow, and facilitate the subsequent separation operation of the pulverized coal airflow.
In some embodiments of the present invention, as shown in fig. 2 and 3, the cross-sectional area of the second flow chamber 121 increases in the first direction. In this embodiment, the first flow chamber 111 is a cylindrical structure, so that the pulverized coal airflow can flow in the first flow chamber 111 at a uniform speed, when the pulverized coal airflow enters the second flow chamber 121, because the cross-sectional area of the second flow chamber 121 in the first direction increases progressively, and because the mass of the pulverized coal and the mass of the air in the pulverized coal airflow are different, a large amount of pulverized coal can rush into the second partition 132 of the main body (i.e., the fourth flow chamber 1321) by virtue of the inertia of the pulverized coal, and because the air has smaller inertia and smaller mass than the pulverized coal, the second flow chamber 121 can be filled after entering the second flow chamber 121 and respectively enter the third flow chamber 1311 and the fourth flow chamber 1321, most of the pulverized coal and the air entering the fourth flow chamber 1321 form a concentrated pulverized coal airflow, and a small portion of the pulverized coal and the air entering the third flow chamber 1311 form a diluted pulverized coal airflow. Finally, the rich pulverized coal airflow flows into the furnace chamber 301 for combustion, while the circumferential light pulverized coal airflow can cause the flow rate to be reduced due to the volume expansion of the air entering the second flow chamber 121, and can flow along the water-cooled wall to form a wall-attached airflow when entering the furnace chamber 301, so that the problem that the water-cooled wall is corroded due to high temperature is reduced.
In some embodiments of the present invention, as shown in fig. 2 and 3, a bracket set is disposed between the first partition 131 and the second partition 132, and includes a plurality of fixing brackets 133 disposed at intervals along the circumference of the second partition 132. In this embodiment. The plurality of fixing brackets 133 are used to connect the first partition 131 and the second partition 132, and are spaced and uniformly arranged along the circumferential direction of the second partition 132, so that stable connection between the first partition 131 and the second partition 132 can be ensured, and the stability is improved.
In some embodiments of the present invention, as shown in fig. 2 and 3, the inner diameter dimension of the separation section 11 is less than or equal to the inner diameter dimension of the second partition section 132. In this embodiment, the separation portion 11, the first partition portion 131, and the second partition portion 132 are all circular structures, and the inner diameter of the separation portion 11 is smaller than or equal to the inner diameter of the second partition portion 132, so that it can be ensured that most of the pulverized coal flowing out of the separation portion 11 can rush into the fourth flow chamber 1321 due to the inertia effect, and the pulverized coal airflow is further separated for the second time.
In some embodiments of the present invention, as shown in fig. 2 and 3, the center line of the separation section 11 is disposed coincident with the center line of the second partition 132. In this embodiment, the separation portion 11 is disposed coaxially with the second partition 132, which can further ensure that most of the pulverized coal flowing out from the separation portion 11 finally flows into the fourth flow chamber 1321, so that the pulverized coal separation structure 10 achieves a corresponding separation effect.
Specifically, in the present invention, the ratio of the coal dust content of the rich coal dust flow in the fourth flow chamber 1321 to the coal dust content of the lean coal dust flow in the third flow chamber 1311 is 9: 1 to 9.5: 0.5, the air volume ratio of the dense coal dust airflow in the fourth flow chamber 1321 to the thin coal dust airflow in the third flow chamber 1311 is 2.5: 7.5 to 3.5: 6.5. the flow rate of the gas in the fourth flow chamber 1321 is 22-25m/s and the flow rate of the gas in the third flow chamber 1311 is 3-4 m/s. Third flow chamber 1311 in the present invention is a square ring structure with an outermost aspect ratio of 1.05: 1 to 1.1: 1. the ratio of the inner diameter size of the fourth flow cavity 1321 to the inner diameter size of the exhaust pipeline is 1: 1.5 to 1: 1.7.
specifically, in the present invention, a refractory castable material of 200mm is coated on an inner wall surface of the second partition 132 in the axial direction, for preventing damage due to high temperature.
Further, the operation flow of the pulverized coal separation structure 10 of the present invention is: when the exhaust gas (i.e., the pulverized coal gas flow) flowing out of the cyclone burner 41 flows to the second transition portion 14, the pulverized coal gas flow can be compressed and the flow rate thereof can be increased because the second transition portion 14 has a diameter-variable structure, and when the exhaust gas passes through the separation portion 11 and enters the second flow chamber 121 of the first transition portion 12, the pulverized coal can flow into the fourth flow chamber 1321 through most of its inertia because of the different mass of the pulverized coal and air in the pulverized coal gas flow, and the air gradually fills the second flow chamber 121 and flows into the third flow chamber 1311 and the fourth flow chamber 1321 respectively when entering the second flow chamber 121, the air and a small amount of the pulverized coal in the third flow chamber 1311 form a light pulverized coal gas flow, and the air and a large amount of the pulverized coal in the fourth flow chamber 1321 form a pulverized coal gas flow. Then the rich pulverized coal airflow flows into the furnace chamber 301 for combustion, while the circumferential light pulverized coal airflow can cause the flow velocity to be reduced due to the volume expansion of the air entering the second flow chamber 121, and can flow along the water-cooled wall to form a wall-attached airflow when entering the furnace chamber 301, so that the problem that the water-cooled wall is corroded due to high temperature is reduced.
The present invention also provides a pulverized coal combustion system, as shown in fig. 1, including:
a hearth 300, wherein a furnace cavity 301 is arranged in the hearth 300;
By using the pulverized coal combustion system of the utility model, a hearth 300, a pulverized coal separation structure group, an exhaust gas channel 20, and a cyclone burner 41 and a secondary air box 30 which are positioned at the bottom end of the hearth 300 are combined, a pulverized coal pipeline and a primary air flow are communicated and mixed to enter the cyclone burner 41, and a concentrated pulverized coal air flow is conveyed to the bottom end of a furnace chamber 301 to be combusted under the action of the secondary air box 30, a light pulverized coal air flow is conveyed to the pulverized coal separation structure group through the exhaust gas pipeline, each pulverized coal separation structure 10 in the pulverized coal separation structure group can carry out secondary separation, namely, the light pulverized coal air flow conveyed by the cyclone burner 41 is separated again and is separated into the light pulverized coal air flow and the concentrated pulverized coal air flow of the pulverized coal separation structure 10, the light pulverized coal air flow of the pulverized coal separation structure 10 flows along a water wall and forms a wall-attached air flow after entering the hearth 300, thereby reducing the problem of corrosion of the water-cooled wall due to high temperature, the concentrated coal airflow of the coal dust separation structure 10 is directly introduced to the side end of the furnace chamber 301 for combustion.
Specifically, in this embodiment, 50% of the primary air flow and 10% -15% of the pulverized coal enter the exhaust gas channel 20 and are finally conveyed to the side end of the furnace chamber 301 for combustion. 50% of the primary air flow and 85% -90% of the coal dust are sprayed into the furnace chamber 301 from the nozzle of the cyclone burner 41 to be combusted.
Specifically, in the present embodiment, when the pulverized coal airflow in the exhaust channel 20 enters the pulverized coal separating structure 10, 65% to 75% of the air and 90% to 95% of the pulverized coal enter the furnace 300 from the fourth flow chamber 1321, and 25% to 35% of the air and 5% to 10% of the pulverized coal enter the furnace 300 from the fourth flow chamber 1321.
Specifically, in this embodiment, the pulverized coal separating structure group includes two pulverized coal separating structures 10 respectively disposed at two opposite sides of the furnace chamber 301.
In some embodiments of the present invention, the pulverized coal combustion system includes a second combustion assembly 200, the second combustion assembly 200 is disposed at the top end of the furnace chamber 300 and has the same structure as the first combustion assembly 100, a first outlet end of the second combustion assembly 200 communicates with the top end of the furnace chamber 301, and a second outlet end of the second combustion assembly 200 communicates with the side end of the furnace chamber 301. In this embodiment, the second combustion assembly 200 can convey the pulverized coal airflow to the top end of the furnace chamber 301 for combustion, and simultaneously convey the pulverized coal airflow to the side end of the furnace chamber 301 for combustion, and the pulverized coal separation structure 10 of the second combustion assembly 200 can further protect the side end of the furnace chamber 301 at high temperature due to the same structure as the first combustion assembly 100, thereby further improving the reliability and the service life of the pulverized coal combustion assembly.
In some embodiments of the present invention, the cyclone burner group comprises a plurality of cyclone burners 41, and the plurality of cyclone burners 41 are spaced along the second direction (i.e., the lateral direction of the furnace). In this embodiment, the plurality of cyclone burners 41 can deliver a large amount of pulverized coal airflow to the bottom end and the side end of the furnace chamber 301, so that the pulverized coal airflow is combusted in the furnace chamber 301, thereby improving reliability.
Specifically, in this embodiment, the secondary wind box 30 may be a plurality of, and is stacked along the third direction, so that the pulverized coal airflow to the cyclone burner 41 can be blown more strongly, and the combustion effect is convenient to improve.
Specifically, in the present invention, the distance between the pulverized coal separating structure 10 of each group of burner assemblies and the cyclone burner 41 in the third direction (i.e., the longitudinal direction of the furnace) is 250mm to 500 mm. In addition, the distance between the two pulverized coal separation structures 10 of each group of combustion assemblies along the second direction is 2500mm-3000 mm.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the utility model. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A pulverized coal separating structure, comprising:
a separation section (11) having a first flow chamber (111) therein (11);
a first transition part (12), wherein the inlet end of the first transition part (12) is connected with the outlet end of the separation part (11), and a second flow cavity (121) communicated with the first flow cavity (111) is arranged in the first transition part (12);
the main body part comprises a first partition part (131) and a second partition part (132), the first partition part (131) is connected to the outlet end of the first transition part (12) and sleeved outside the second partition part (132), a third flow cavity (1311) is arranged between the first partition part (131) and the second partition part (132), a fourth flow cavity (1321) is arranged in the second partition part (132), the third flow cavity (1311) and the fourth flow cavity (1321) are respectively communicated with the second flow cavity (121), and the fourth flow cavity (1321) is arranged corresponding to the first flow cavity (111) in the first direction.
2. The pulverized coal separation structure according to claim 1, characterized in that the pulverized coal separation structure (10) comprises a second transition portion (14), the outlet end of the second transition portion (14) is connected with the inlet end of the separation portion (11), and the second transition portion (14) has a fifth flow chamber (141) therein communicating with the first flow chamber (111).
3. The pulverized coal separation structure according to claim 2, characterized in that the cross-sectional area of the fifth flow chamber (141) in the first direction decreases.
4. The pulverized coal separation structure according to claim 1, characterized in that the cross-sectional area of the second flow chamber (121) in the first direction increases.
5. The pulverized coal separating structure according to claim 1, wherein a bracket set is provided between the first partition (131) and the second partition (132), the bracket set including a plurality of fixing brackets (133) provided at intervals in a circumferential direction of the second partition (132).
6. The pulverized coal separating structure according to claim 1, characterized in that the inner diameter dimension of the separating portion (11) is smaller than or equal to the inner diameter dimension of the second partition portion (132).
7. The pulverized coal separation structure according to claim 1, characterized in that the centerline of the separation portion (11) is provided coincident with the centerline of the second partition portion (132).
8. A pulverized coal combustion system, comprising:
a hearth (300), wherein a furnace cavity (301) is arranged in the hearth (300);
the first combustion assembly (100), the first combustion assembly (100) comprises a coal powder separation structure group, an exhaust gas channel (20), a cyclone burner group and a secondary air box (30) which are respectively arranged at the bottom end of the hearth (300), the cyclone burner group is embedded in the secondary air box (30), the first outlet end of the cyclone burner group is communicated with the bottom end of the furnace chamber (301), the second outlet end of the cyclone burner group is connected with the inlet end of the pulverized coal separation structure group through the exhaust gas channel (20), the outlet end of the coal dust separation structure group is communicated with the side end of the furnace chamber (301), the coal dust separation structure group comprises a plurality of coal dust separation structures (10) arranged along the side wall of the hearth (300), the coal dust separation structure (10) is a coal dust separation structure (10) according to any one of claims 1 to 7.
9. The pulverized coal combustion system as set forth in claim 8, which comprises a second combustion assembly (200), said second combustion assembly (200) being disposed at the top end of said furnace chamber (300) and having the same structure as said first combustion assembly (100), a first outlet end of said second combustion assembly (200) being in communication with the top end of said furnace chamber (301), and a second outlet end of said second combustion assembly (200) being in communication with the side end of said furnace chamber (301).
10. Pulverized coal combustion system according to claim 8, characterized in that the cyclone burner group comprises a plurality of cyclone burners (41), the plurality of cyclone burners (41) being arranged at intervals in the second direction.
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