A dual-adjustable direct current combustion stabilizing device with radial concentration separation

Abstract

The present invention belongs to the technical field of power station boiler combustion equipment, and particularly relates to a dual-adjustable direct current combustion stabilizing device with radial thick-lean separation. The technical solution is as follows: a dual-adjustable direct current combustion stabilizing device with radial thick-lean separation, comprising a secondary air component, an outer primary air component provided in the secondary air component, an inner primary air component provided in the outer primary air component, a shuttle-shaped thick-lean separation block fixed in the outer primary air component; a cyclone provided between the secondary air component and the outer primary air component, a cyclone secondary air regulating mechanism for moving the cyclone connected between the cyclone and the secondary air component; an inner primary air regulating mechanism for moving the inner primary air component connected between the inner primary air component and the outer primary air component; a secondary air volume regulating mechanism connected to the secondary air component. The present invention provides a dual-adjustable direct current combustion stabilizing device with radial thick-lean separation, which improves the self-stabilizing combustion capability of the strong burner and enhances the flexibility of operation adjustment of the coal-fired unit.

Description

Technical Field

[0001] The invention belongs to the technical field of power station boiler combustion equipment, and in particular relates to a radial thick-lean separation dual-adjustable direct-flow combustion stabilizing device. Background Art

[0002] During the peak regulation process of coal-fired units, many problems will arise because the units are in a low-load operation state, the most important of which is the problem of stable combustion of the boiler at low load.

[0003] For boilers using direct current burners during deep peak regulation, under low load conditions, the temperature level of the furnace in the main combustion area decreases, the coal powder concentration at the pulverizer outlet decreases, and the total amount of combustion-supporting air volume decreases, resulting in reduced airflow momentum, weakened rigidity, worsened air-powder mixing flow field in the furnace, and difficulty in self-sustaining stable combustion of the burner.

[0004] Therefore, in order to adapt to the low-load stable combustion capability under the new form, it is urgent to upgrade and transform the combustion equipment of coal-fired boilers, improve the self-stabilizing combustion capability of strong burners, and enhance the flexibility of coal-fired unit operation adjustment. Summary of the Invention

[0005] In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide a radial thick-thin separation dual-adjustable direct current combustion stabilization device to improve the self-stabilization capability of the strong burner and enhance the flexibility of the operation adjustment of the coal-fired unit.

[0006] The technical solution adopted in the present invention is:

[0007] A dual-adjustable direct current combustion stabilization device with radial thick-lean separation comprises a secondary air assembly, an outer primary air assembly is arranged in the secondary air assembly, an inner primary air assembly is arranged in the outer primary air assembly, a shuttle-shaped thick-lean separation block is fixed in the outer primary air assembly; a cyclone is arranged between the secondary air assembly and the outer primary air assembly, a cyclone secondary air adjustment mechanism for moving the cyclone is connected between the cyclone and the secondary air assembly; an inner primary air adjustment mechanism for moving the inner primary air assembly is connected between the inner primary air assembly and the outer primary air assembly; a secondary air volume adjustment mechanism is connected to the secondary air assembly.

[0008] When the boiler unit is operating at low load, the internal primary air control mechanism pulls the entire internal primary air assembly forward, increasing the distance between the internal primary air control mechanism and the shuttle-shaped thick-lean separation block, thereby increasing the separation ratio between the internal and external primary air powder concentrations. After separation, the coal powder concentration in the external primary air increases, and the flow cross-section of the external primary air nozzle decreases, increasing the jet velocity of the external primary air powder, increasing the jet rigidity, and extending the flame length of the coal powder jet. After separation, the coal powder concentration in the internal primary air decreases, and the powder enters the central recirculation zone of the furnace through the internal primary air nozzle, allowing it to ignite and burn promptly. Simultaneously, the opening of the secondary air volume control mechanism is controlled to reduce the amount of combustion-supporting secondary air. The swirl secondary air control mechanism pulls the entire cyclone backward, reducing the swirl intensity of the secondary air, increasing the rigidity of the secondary air flow, and controlling the mixing of the secondary air and primary air powder to achieve optimal combustion conditions.

[0009] When the boiler unit is operated at increased load, the internal primary air control mechanism pulls the entire internal primary air assembly backward, reducing the distance between the internal primary air control mechanism and the shuttle-shaped thick-lean separation block, and thus reducing the separation ratio between the internal and external primary air powder concentrations. After separation, the external primary air volume increases, the coal powder concentration of the primary air powder decreases, and the flow cross-section of the external primary air nozzle increases, achieving a suitable primary air powder jet velocity, reducing jet rigidity, and maintaining a stable coal powder jet flame length. After separation, the internal primary air volume decreases, while the coal powder concentration of the primary air powder increases. The primary air powder enters the central recirculation zone of the furnace through the internal primary air nozzle, allowing it to ignite and burn promptly. Simultaneously, the opening of the secondary air volume control mechanism is controlled to increase the combustion-supporting secondary air volume. The swirl secondary air control mechanism pulls the entire cyclone forward, increasing the swirl intensity of the secondary air, reducing the secondary air flow rigidity, and controlling the mixing of the secondary air and primary air powder to achieve optimal combustion conditions.

[0010] According to the load operation requirements of the boiler, the combustion device of the present invention coordinates the adjustment of parts such as the external primary air component, the internal primary air component, the secondary air component, the internal primary air adjustment mechanism, the swirl secondary air adjustment mechanism and the secondary air volume adjustment mechanism to control the mixing disturbance of the secondary air and the primary air powder, realize the reasonable organization of air distribution combustion, and improve the combustion adaptability and combustion stability of the combustion device under different loads.

[0011] As a preferred embodiment of the present invention, the secondary air assembly comprises interconnected secondary air nozzles and a secondary air duct, with a secondary air volume control mechanism connected to the secondary air duct. A swirler imparts rotation to the hot secondary air passing through the nozzles. After passing through the secondary air nozzles, the swirling airflow enters the furnace, forming a recirculation zone, entraining high-temperature flue gas and providing energy for ignition of the pulverized coal airflow. The swirl degree of the swirler can be adjusted through design selection to accommodate the combustion characteristics of different coal fuels.

[0012] As a preferred solution of the present invention, the swirl secondary air regulating mechanism includes a sleeve, the cyclone is fixed on the sleeve, the sleeve is sleeved on the outer primary air assembly, a short pull rod is connected to the sleeve, and the other end of the short pull rod extends out of the secondary air assembly.

[0013] As a preferred solution of the present invention, a first roller is installed on the sleeve, and the first roller is overlapped on the outer wall of the outer primary air component.

[0014] As a preferred solution of the present invention, a first sealing and pressing member is provided between one end of the short pull rod extending out of the secondary air assembly and the secondary air assembly.

[0015] As a preferred embodiment of the present invention, the external primary air assembly includes an external primary air nozzle and an external primary air cylinder that are connected to each other.

[0016] As a preferred solution of the present invention, the inner primary air assembly includes an inner primary air nozzle and an inner primary air cylinder connected to each other, and the inner primary air regulating mechanism is connected to the inner primary air cylinder.

[0017] As a preferred solution of the present invention, the inner primary air adjustment mechanism includes a support member fixed on the inner primary air assembly, a long pull rod is connected to the support member, and the other end of the long pull rod extends from the outer primary air assembly.

[0018] As a preferred solution of the present invention, a second roller is connected to the support member, and the second roller is overlapped on the inner wall of the outer primary air component.

[0019] As a preferred solution of the present invention, a second sealing and pressing member is provided between one end of the long pull rod extending out of the external primary air assembly and the external primary air assembly.

[0020] The beneficial effects of the present invention are:

[0021] The present invention utilizes a dual-adjustable direct current combustion stabilization device with radial concentration-lean separation to achieve radial concentration-lean separation of pulverized coal airflow and local fuel staging, thereby increasing the concentration of the pulverized coal airflow entering the furnace and enhancing the burner's ability to operate stably at low loads. The present invention utilizes radial concentration-lean separation technology, concentration-lean separation ratio adjustment technology, and dual-adjustable air distribution technology. Through appropriate pulverized coal concentration-lean separation regulation, adjustment of the central recirculation zone size, rationally organized combustion-supporting air distribution, and nozzle structure design of the burner, the present invention effectively improves the burner's self-stabilizing combustion capability at low loads and its combustion adaptability to different load ranges. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 yes Figure 1 Cross-sectional view at point A;

[0024] Figure 3 yes Figure 1 Cross-sectional view at point B;

[0025] Figure 4 yes Figure 1 Cross-sectional view at point C in the middle;

[0026] Figure 5 It is a schematic diagram of the four-corner tangential circle combustion arrangement;

[0027] Figure 6 yes Figure 5 Schematic diagram of the structure of each nozzle.

[0028] In the figure: 1-secondary air assembly; 2-external primary air assembly; 3-inner primary air assembly; 4-shuttle-type thick-thin separation block; 5-cyclone; 6-cyclone secondary air adjustment mechanism; 7-inner primary air adjustment mechanism; 8-secondary air volume adjustment mechanism; 9-combustion stabilizing tooth; 11-secondary air nozzle; 12-secondary air duct; 21-external primary air nozzle; 22-external primary air duct; 23-connecting flange; 31-inner primary air nozzle; 32-inner primary air duct; 61 -sleeve; 62-rib; 63-first connecting jacket; 64-short pull rod; 65-first roller; 66-first sealing and pressing member; 71-support member; 72-second connecting jacket; 73-long pull rod; 74-second roller; 75-second sealing and pressing member; 81-secondary air inlet pipe; 82-electric drive device; 83-throttle adjustment baffle; a-coal powder airflow nozzle assembly; b-secondary air nozzle assembly; c-oil secondary air nozzle assembly. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features therein may be combined with each other unless there is a conflict.

[0031] In order to obtain a lower stable combustion load and improve the peak-shaving capacity of the coal-fired unit, the present invention provides a dual-adjustable direct current stable combustion device with radial thick-lean separation. The present invention is mainly implemented by means of radial thick-lean separation technology, coal powder thick-lean separation ratio adjustment technology and dual-adjustable air distribution technology. The radial thick-lean separation technology is adopted, that is, a shuttle-shaped thick-lean separation block 4 is set in the primary air-powder airflow channel, so that the primary air-powder airflow passing through it produces radial thick-lean separation to form an annular air-powder airflow with thick outside and thin inside, the coal powder concentration of the air-powder airflow on the outside is high, and the coal powder concentration of the air-powder airflow on the inside is low. The thick-lean separation ratio adjustment technology is adopted, that is, the distance between the inner primary air component 3 and the shuttle-shaped thick-lean separation block 4 is adjusted by using the inner primary air rolling adjustment device to achieve the separation ratio of the inner primary air powder and the outer primary air powder concentration, adapt to the adjustment of high and low load operation switching of the boiler unit, and enhance the adjustment ability and adaptability of the burner. The system employs dual-adjustable air distribution technology, using a secondary air rolling adjustment device to adjust the position of the axial swirler 5 to alter the secondary air swirl intensity. Controlling the opening of the damper 83 adjusts the combustion-supporting secondary air volume. By appropriately regulating the concentration and thinness of pulverized coal, adjusting the size of the central recirculation zone, and rationally managing air distribution, the burner's self-stabilizing combustion capability at low loads is enhanced, strengthening its combustion adaptability across different load ranges.

[0032] The present invention combines the four-corner tangential circle combustion arrangement mode with the design of alternating arrangement of primary and secondary air, which can further optimize the combustion organization conditions in the furnace and improve the peak-shaving operation capability of the boiler unit.

[0033] like Figures 1 to 4 As shown, the dual-adjustable direct current combustion stabilization device with radial thick-lean separation in this embodiment includes a secondary air component 1, an outer primary air component 2 is arranged in the secondary air component 1, an inner primary air component 3 is arranged in the outer primary air component 2, and a shuttle-shaped thick-lean separation block 4 is fixed in the outer primary air component 2; a cyclone 5 is arranged between the secondary air component 1 and the outer primary air component 2, and a cyclone secondary air regulating mechanism 6 for moving the cyclone 5 is connected between the cyclone 5 and the secondary air component 1; an inner primary air regulating mechanism 7 for moving the inner primary air component 3 is connected between the inner primary air component 3 and the outer primary air component 2; a secondary air volume regulating mechanism 8 is connected to the secondary air component 1.

[0034] According to the load operation requirements of the boiler, the combustion device of the present invention coordinates the adjustment of parts such as the external primary air component 2, the internal primary air component 3, the secondary air component 1, the internal primary air adjustment mechanism 7, the swirl secondary air adjustment mechanism 6 and the secondary air volume adjustment mechanism 8 to control the mixing disturbance of the secondary air and the primary air powder, realize the reasonable organization of air distribution combustion, and improve the combustion adaptability and combustion stability of the combustion device under different loads.

[0035] Specifically, the secondary air assembly 1 comprises interconnected secondary air nozzles b11 and a secondary air duct 12. The secondary air volume adjustment mechanism 8 is connected to the secondary air duct 12. The swirler 5 imparts rotation to the hot secondary air passing through the secondary air nozzles b11. After passing through the secondary air nozzles b11, the swirling airflow enters the furnace, forming a recirculation zone, entraining high-temperature flue gas and providing energy for the ignition of the pulverized coal airflow. The swirl degree of the swirler 5 can be adjusted through design selection to suit the combustion characteristics of different coal fuels.

[0036] Specifically, the swirl secondary air regulating mechanism 6 includes a sleeve 61, the cyclone 5 is fixed on the sleeve 61, the sleeve 61 is sleeved on the outer primary air component 2, a rib 62 is fixed on the sleeve 61, the rib 62 is connected to the first connecting sleeve 63 by a fastener, and the first connecting sleeve 63 is threadedly connected to the short pull rod 64. The secondary air cylinder 12 is closed at one end away from the secondary air nozzle b11, and the other end of the short pull rod 64 extends from the closed end face of the secondary air cylinder 12. A first roller 65 is installed on the sleeve 61, and the first roller 65 is overlapped on the outer wall of the outer primary air component 2. A first sealing and pressing member 66 is provided between the end of the short pull rod 64 extending out of the secondary air component 1 and the secondary air component 1, which mainly plays a role in preventing leakage. When the short pull rod 64 is pulled, the cyclone 5 moves back and forth as a whole, so as to adjust the swirl strength of the secondary air and match the air distribution of the combustion organization running at different loads.

[0037] Specifically, the external primary air assembly 2 comprises an interconnected external primary air nozzle 21 and an external primary air duct 22. Primary pulverized coal airflow from the upstream pulverized coal pipeline enters the primary air duct. After passing through the shuttle-shaped thick-lean separation block 4 housed within the external primary air duct 22, the pulverized coal airflow undergoes radial separation, forming an annular pulverized coal airflow distribution with thick coal on the outside and thin coal on the inside. The thick coal airflow approaches the outer side of the primary air duct cross section, while the thin coal airflow is concentrated at the center of the cross section of the external primary air duct 22. The thick coal airflow passes through the external primary air nozzle 21 near the inner wall of the external primary air duct 22 before being injected into the furnace for combustion.

[0038] Specifically, the internal primary air assembly 3 includes an internal primary air nozzle 31 and an internal primary air duct 32, which are interconnected. The internal primary air regulating mechanism 7 is connected to the internal primary air duct 32. The lean-side pulverized coal airflow formed after passing through the fixed shuttle-shaped thick-lean separation block 4 is relatively concentrated at the center of the primary air duct cross-section, enters the internal primary air duct 32, and then passes through the internal primary air nozzle 31 to be sprayed into the furnace for combustion. The internal primary air nozzle 31 is the frontmost part of the lean-side pulverized coal airflow entering the furnace. It is made of high-temperature resistant material and is designed as a flared nozzle. It can form a central recirculation zone, entraining high-temperature flue gas to enhance the ignition and combustion of the pulverized coal.

[0039] The outer primary air nozzle 21 is provided with a combustion stabilizing tooth 9, and the outer wall of the inner primary air nozzle 31 is also provided with a combustion stabilizing tooth 9 to enhance the turbulence of the rich side pulverized coal airflow, promote the pulverized coal airflow to enter the furnace and mix evenly with the secondary air, promote the timely ignition of the pulverized coal airflow, and improve the stable combustion ability of the burner.

[0040] Specifically, the inner primary air adjustment mechanism 7 includes two sets of support members 71 fixed to the inner primary air assembly 3. A second connecting sleeve 72 is connected to the set of support members 71 away from the inner primary air outlet 31 via fasteners. A long pull rod 73 is threadedly connected to the second connecting sleeve 72. A connecting flange 23 is fixed to the end of the outer primary air cylinder 22 away from the outer primary air outlet 21, and the other end of the long pull rod 73 extends from the connecting flange 23. Both sets of support members 71 are connected to a second roller 74, which overlaps the inner wall of the outer primary air assembly 2. A second sealing and pressing member 75 is disposed between the end of the long pull rod 73 extending from the outer primary air assembly 2 and the outer primary air assembly 2, primarily to prevent leakage. When the long pull rod 73 is pulled, the inner primary air assembly 3 moves back and forth as a whole, adjusting the distance between the inner primary air tube 32 and the shuttle-shaped thick and thin separation block 4, so as to adjust the separation ratio of the inner primary air powder and the outer primary air powder concentration, thereby adapting to the adjustment of high and low load operation switching of the boiler unit, enhancing the adjustment ability and adaptability of the burner, and obtaining the best combustion conditions.

[0041] The secondary air volume adjustment mechanism 8 includes a secondary air inlet 81 connected to the side wall of the secondary air duct 12. An electric drive unit 82 is mounted on the secondary air inlet 81. The output of the electric drive unit 82 is connected to a damper adjustment baffle 83, which covers the opening of the secondary air inlet 81. Hot secondary air passes through the damper adjustment baffle 83 and enters the secondary air assembly 1, where it is then fed into the furnace to assist combustion. The combustion-supporting secondary air volume can be adjusted by controlling the opening of the secondary damper, achieving optimal air distribution and combustion. The damper opening is controlled by the electric drive unit 82.

[0042] like Figure 5 and Figure 6As shown, the DC stable combustion spray device is suitable for a four-corner tangential combustion arrangement, and the arrangement adopts a design in which the pulverized coal airflow nozzle assembly a, the secondary air nozzle assembly b, and the oil secondary air nozzle assembly c are arranged alternately. Among them, the pulverized coal airflow nozzle assembly a is a nozzle assembly composed of an outer primary air nozzle 21, an inner primary air nozzle 31, and a secondary air nozzle 11; an ignition oil gun can be installed in the oil secondary air nozzle c. This arrangement can better realize the mixed combustion of fuel staged and air staged in the furnace, and then by controlling the pulverized coal airflow concentration distribution and the combustion-supporting air volume of the DC stable combustion spray device, and rationally organizing the coordinated combustion of the secondary air, it can effectively enhance the stable combustion ability and combustion adaptability of the spray device, and realize that the pulverized coal airflow can ignite and burn stably in time after leaving the burner nozzle, optimize the combustion organization working conditions in the furnace, and improve the peak-shaving operation capability of the boiler unit.

[0043] Working principle:

[0044] When the boiler unit is operating at low load, the inner primary air assembly 3 is pulled forward as a whole by the long pull rod 73, increasing the distance between the inner primary air duct 32 and the shuttle-shaped thick-thin separation block 4, and increasing the separation ratio of the inner and outer primary air powder concentrations. After separation, the coal powder concentration of the outer primary air powder increases, and the flow cross-section of the outer primary air nozzle 21 decreases, thereby increasing the outer primary air powder jet velocity, increasing the jet rigidity, and extending the coal powder jet flame length. The outer primary air nozzle 21 is provided with a stabilizing tooth 9, and the outer wall of the inner primary air nozzle 31 is also provided with a stabilizing tooth 9 to enhance the turbulence of the rich side coal powder airflow, promote the uniform mixing of the coal powder airflow with the secondary air when entering the furnace, promote the timely ignition of the coal powder airflow, and enhance the burner's stable combustion capability. After separation, the coal powder concentration of the inner primary air powder decreases, and it enters the central recirculation zone of the furnace through the inner primary air nozzle 31, igniting and burning in a timely manner. At the same time, the damper is controlled to adjust the baffle opening to reduce the amount of combustion-supporting secondary air. The cyclone 5 is pulled backward as a whole by the short pull rod 64, thereby reducing the swirl intensity of the secondary air, increasing the rigidity of the secondary air flow, controlling the mixing of the secondary air and the primary air powder, and obtaining the best combustion condition.

[0045] When the boiler unit is running at increased load, the inner primary air assembly 3 is pulled backward as a whole by the long pull rod 73, reducing the distance between the inner primary air duct 32 and the shuttle-shaped thick and thin separation block 4, and reducing the separation ratio of the inner and outer primary air powder concentrations. After separation, the outer primary air volume increases, the coal powder concentration of the primary air powder decreases, and the flow cross-section of the outer primary air nozzle 21 increases, obtaining a suitable primary air powder jet velocity, reducing the jet rigidity, and maintaining a stable coal powder jet flame length. After separation, the inner primary air volume decreases, the coal powder concentration of the primary air powder increases, and it enters the central recirculation zone of the furnace through the inner primary air nozzle 31, igniting and burning in time. At the same time, the damper is controlled to adjust the baffle opening to increase the combustion-supporting secondary air volume. The cyclone 515 is pulled forward as a whole by the short pull rod 64, increasing the swirl intensity of the secondary air, reducing the secondary air flow rigidity, controlling the mixing of the secondary air and the primary air powder, and obtaining the best combustion conditions.

[0046] According to the boiler load operation requirements, the combustion device coordinates and adjusts the external primary air component 2, the internal primary air component 3, the secondary air component 1, the internal primary air regulating mechanism 7, the swirl secondary air regulating mechanism 6 and the secondary air volume regulating mechanism 8 to control the mixing disturbance of the secondary air and the primary air powder, realize the reasonable organization of the air distribution combustion, and improve the combustion adaptability and combustion stability of the combustion device under different loads.

[0047] When a boiler unit is operating at low load, the fineness and uniformity of pulverized coal (PFC) significantly impact the burner's stable combustion characteristics. Numerous practical and theoretical studies have shown that high-concentration PFC airflow plays a crucial role in the ignition and stable combustion of a rich-lean separation burner.

[0048] The present invention utilizes a dual-adjustable direct current combustion stabilization device with radial concentration-lean separation to achieve radial concentration-lean separation of pulverized coal airflow and local fuel staging, thereby increasing the concentration of the pulverized coal airflow entering the furnace and enhancing the burner's ability to operate stably at low loads. The present invention utilizes radial concentration-lean separation technology, concentration-lean separation ratio adjustment technology, and dual-adjustable air distribution technology. Through appropriate pulverized coal concentration-lean separation regulation, adjustment of the central recirculation zone size, rationally organized combustion-supporting air distribution, and nozzle structure design of the burner, the present invention effectively improves the burner's self-stabilizing combustion capability at low loads and its combustion adaptability to different load ranges.

[0049] The present invention combines the four-corner tangential circle combustion arrangement mode with the design of alternating primary and secondary air arrangements to optimize the staged combustion in the furnace. By controlling the primary air powder concentration distribution and secondary air volume adjustment of the direct current stable combustion injection device, the air distribution combustion is rationally organized to ensure that the pulverized coal airflow can ignite and burn stably in time after leaving the burner nozzle, thereby optimizing the combustion organization working conditions in the furnace and improving the peak-shaving operation capability of the boiler unit.

[0050] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any technical solution that falls within the scope defined by the claims of the present invention falls within the scope of protection of the present invention.

Claims

1. A dual-adjustable direct current combustion stabilization device with radial concentration separation, characterized by: The invention comprises a secondary air component (1), wherein an outer primary air component (2) is arranged in the secondary air component (1), an inner primary air component (3) is arranged in the outer primary air component (2), and a shuttle-shaped thick-thin separation block (4) is fixed in the outer primary air component (2); a cyclone (5) is arranged between the secondary air component (1) and the outer primary air component (2), and a cyclone secondary air adjustment mechanism (6) for moving the cyclone (5) is connected between the cyclone (5) and the secondary air component (1); an inner primary air adjustment mechanism (7) for moving the inner primary air component (3) is connected between the inner primary air component (3) and the outer primary air component (2); and a secondary air volume adjustment mechanism (8) is connected to the secondary air component (1).

2. The dual-adjustable direct current combustion stabilization device with radial density separation according to claim 1, characterized in that: The secondary air component (1) comprises a secondary air nozzle (11) and a secondary air cylinder (12) connected to each other, and a secondary air volume adjustment mechanism (8) is connected to the secondary air cylinder (12).

3. The dual-adjustable direct current combustion stabilization device with radial density separation according to claim 1, characterized in that: The swirl secondary air regulating mechanism (6) comprises a sleeve (61), the cyclone (5) is fixed on the sleeve (61), the sleeve (61) is sleeved on the outer primary air assembly (2), a short pull rod (64) is connected to the sleeve (61), and the other end of the short pull rod (64) extends out of the secondary air assembly (1).

4. The dual-adjustable direct current combustion stabilization device with radial density separation according to claim 3 is characterized in that: A first roller (65) is mounted on the sleeve (61), and the first roller (65) is overlapped on the outer wall of the outer primary air component (2).

5. The dual-adjustable direct current combustion stabilization device with radial density separation according to claim 3 is characterized in that: A first sealing and pressing member (66) is provided between one end of the short pull rod (64) extending out of the secondary air assembly (1) and the secondary air assembly (1).

6. The dual-adjustable direct current combustion stabilization device with radial density separation according to claim 1, characterized in that: The external primary air assembly (2) comprises an external primary air nozzle (21) and an external primary air cylinder (22) that are connected to each other.

7. The dual-adjustable direct current combustion stabilization device with radial density separation according to claim 1, characterized in that: The inner primary air assembly (3) comprises an inner primary air nozzle (31) and an inner primary air cylinder (32) connected to each other, and an inner primary air regulating mechanism (7) is connected to the inner primary air cylinder (32).

8. The dual-adjustable direct current combustion stabilization device with radial density separation according to claim 1 is characterized in that: The inner primary air regulating mechanism (7) comprises a support member (71), the support member (71) is fixed on the inner primary air assembly (3), a long pull rod (73) is connected to the support member (71), and the other end of the long pull rod (73) extends from the outer primary air assembly (2).

9. The dual-adjustable direct current combustion stabilization device with radial density separation according to claim 8, characterized in that: The support member (71) is connected to a second roller (74), and the second roller (74) is overlapped on the inner wall of the outer primary air component (2).

10. The dual-adjustable direct current combustion stabilization device with radial density separation according to claim 8, characterized in that: A second sealing and pressing member (75) is provided between one end of the long pull rod (73) extending out of the external primary air assembly (2) and the external primary air assembly (2).

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