Auxiliary gas path device and burner

Abstract

The present application belongs to the technical field of combustion equipment, and discloses an auxiliary gas path device and a burner. The auxiliary gas path device is installed on a burner for liquid-gas mixed combustion and comprises a pressure stabilizing ring cavity and a gas pipeline. The pressure stabilizing ring cavity is annular and hollow, and is in communication with the first ends of a plurality of gas pipelines on one side along the circumference. A gas inlet is formed on the pressure stabilizing ring cavity. The burner comprises an air flow channel and a fuel oil passage located in the middle of the air flow channel. The pressure stabilizing ring cavity and the wall surface of the air flow channel are slidably arranged along the extending direction, and a detachable limiting structure is arranged between the pressure stabilizing ring cavity and the wall surface of the air flow channel. The plurality of gas pipelines are located at the periphery of the air flow channel, and the second ends of the gas pipelines are inwardly bent. The gas pipeline is slidably arranged relative to the air flow channel and the fuel oil passage. The position of the gas outlet can be adjusted according to the types of liquid fuel and gaseous fuel and specific working condition parameters, which is beneficial to matching the liquid-gas fuel to the optimal corresponding position and achieving the best combustion effect.

Description

Technical Field

[0001] This invention belongs to the technical field of combustion equipment, and more specifically, relates to an auxiliary gas circuit device and a burner. Background Technology

[0002] With the development of renewable and clean energy, the fuel selection for burners is becoming increasingly diversified, including green methanol, biodiesel, hydrogen, and ammonia. Due to the different physicochemical properties of these fuels, the effects of blending them also vary. In particular, for boiler systems using methanol-hydrogen technology, where applications include both single liquid fuel (methanol) and blended gaseous fuels (hydrogen and carbon monoxide), the combustion characteristics of the mixed fuels are more complex, requiring specific combustion methods to ensure better combustion performance when liquid and gaseous fuels are blended.

[0003] Combustion burners capable of simultaneously burning liquid and gaseous fuels are relatively rare in the market, and their practical application faces several challenges. First, these burners are complex in structure, with high design and manufacturing costs, making widespread adoption difficult. The complex structure not only increases production difficulty but may also lead to maintenance and operational challenges. Second, due to the significant differences in combustion characteristics between liquid and gaseous fuels, the blending effect is difficult to guarantee. When handling dual-fuel systems, burners often struggle to achieve uniform mixing and complete combustion, potentially resulting in low combustion efficiency and non-compliance with emission standards. These issues limit the application of dual-fuel burners, impacting both energy efficiency and compliance with environmental requirements.

[0004] Currently, most mainstream burners lack adjustment capabilities, using fixed liquid-gas nozzle combinations. Different liquid and gaseous fuels have significantly different combustion characteristics. When liquid and gaseous fuels are blended, the optimal liquid-gas nozzle combination needs to be determined by considering both their individual combustion characteristics and the combined effect of blending. Using a fixed combination makes it difficult to maintain optimal combustion performance under different blending modes. Furthermore, factors such as injection pressure, blending ratio, fuel flow rate, and the type and proportion of fuel mixtures also affect the combustion performance of dual-fuel burners, requiring corresponding improvements to the burner based on specific conditions. Therefore, in the case of mixed liquid and gaseous fuel combustion, using a fixed liquid-gas nozzle often fails to match the optimal liquid-gas position, resulting in suboptimal combustion. Summary of the Invention

[0005] In view of the above-mentioned defects or improvement needs of the prior art, the present invention provides an auxiliary gas circuit device and burner to solve the problem that in the case of mixed combustion of liquid fuel and gaseous fuel, the existing fixed liquid-gas dual fuel nozzles often have difficulty matching the optimal liquid-gas corresponding position, thus failing to achieve the best combustion effect.

[0006] To achieve the above objectives, according to one aspect of the present invention, an auxiliary gas circuit device is provided, installed on a burner for liquid-gas mixing combustion, comprising a pressure-stabilizing ring cavity and gas pipelines. The pressure-stabilizing ring cavity is annular and hollow, one side of which is circumferentially connected to the first ends of a plurality of gas pipelines, and the pressure-stabilizing ring cavity is in communication with the gas pipelines. A gas inlet is provided on the pressure-stabilizing ring cavity. The burner includes an air flow channel and a fuel passage located in the middle of the air flow channel and extending in the same direction as the air flow channel. The extension direction of the gas pipeline is consistent with the extension direction of the air flow channel. The walls of the pressure-stabilizing ring cavity and the air flow channel are slidably disposed along the extension direction, and a detachable limiting structure is provided between the walls of the pressure-stabilizing ring cavity and the air flow channel. The plurality of gas pipelines are located on the periphery of the air flow channel, and the second ends of the gas pipelines are bent inward.

[0007] According to the auxiliary gas circuit device provided by the present invention, the burner includes a combustion cylinder, the air flow channel is formed inside the combustion cylinder, the pressure stabilizing ring cavity and the gas pipeline are disposed inside the combustion cylinder or the pressure stabilizing ring cavity is sleeved outside the combustion cylinder such that the gas pipeline is located outside the combustion cylinder;

[0008] When the pressure stabilizing ring cavity and the gas pipeline are located inside the combustion cylinder, the combustion cylinder has an opening corresponding to the gas inlet. The pressure stabilizing ring cavity is detachably connected to the gas inlet to allow gas to enter, and the gas inlet pipeline passes through the opening to limit the position of the pressure stabilizing ring cavity and the combustion cylinder.

[0009] When the pressure stabilizing ring cavity is fitted outside the combustion cylinder, multiple fixing plates are connected circumferentially on the other side of the pressure stabilizing ring cavity. The fixing plates are detachably connected to the combustion cylinder for limiting their position.

[0010] According to the auxiliary gas circuit device provided by the present invention, the pressure stabilizing ring cavity is sleeved outside the combustion cylinder. The auxiliary gas circuit device further includes an annular support and a guide structure. The annular support is disposed inside the plurality of gas pipelines and its first end is connected to one side of the pressure stabilizing ring cavity. The guide structure is connected to the second end of the annular support and corresponds one-to-one with the gas pipelines. A gas hose is provided between the first end and the second end of the gas pipeline. The second end of the gas pipeline passes through the guide structure and is slidably disposed relative to the guide structure.

[0011] According to the auxiliary gas pipeline device provided by the present invention, the first end of the gas pipeline is configured as a straight gas pipe, the second end is configured as a gas nozzle, and the end face of the second end forms a gas outlet.

[0012] According to the auxiliary gas circuit device provided by the present invention, the annular bracket is provided with a positioning groove passing through the second end of the annular bracket at the location corresponding to the gas pipeline, the second end of the annular bracket is provided with an annular support shaft, the guide structure is provided as a guide rotating member, the guide rotating member is provided with a through hole, the second end of the gas pipeline passes through the through hole, the guide rotating member is also provided with a bushing, and the guide rotating member is rotatably connected to the support shaft through the bushing.

[0013] The auxiliary gas circuit device provided by the present invention further includes a constraint positioning ring and a rigid connector. The constraint positioning ring is sleeved on the outside of the annular bracket and is slidably disposed relative to the annular bracket. The constraint positioning ring is provided with an avoidance protrusion at the corresponding position of the gas pipeline. The guide rotating member is provided with a first through hole base, and the avoidance protrusion is provided with a second through hole base. The rigid connector is connected between the first through hole base and the second through hole base. The guide rotating member is rotated by sliding the constraint positioning ring along the annular bracket to adjust the bending angle of the second end of the gas pipeline.

[0014] According to the auxiliary gas circuit device provided by the present invention, the annular support is provided with a long strip-shaped guide groove, and the constraint positioning ring is provided with a matching positioning hole at the corresponding position of the guide groove. The constraint positioning ring is detachably connected to the annular support at the matching positioning hole.

[0015] According to the auxiliary gas circuit device provided by the present invention, the specific dimensional parameters of the auxiliary gas circuit device conform to the following formula requirements:

[0016] [(D2+S2)cosθ+S1sinθ+D1]sinα≤R+S1sinθ-(D2+S2)sinθ;

[0017] Wherein, the distance between the central axis of the bushing and the plane where the fuel outlet of the fuel channel is located is the first positioning distance D1; the length of the gas nozzle extending out of the guide rotating part is the second positioning distance D2; the distance between the central axis of the bushing and the central axis of the combustion cylinder is R; the angle between the central axis of the gas nozzle and the central axis of the fuel outlet is the gas outlet angle θ; the liquid fuel sprayed from the fuel outlet and the gaseous fuel sprayed from the gas outlet form two conical fuel zones, and half of the cone angle of the conical fuel zone of the liquid fuel is taken as the atomization edge angle α; the distance between the central axis of the bushing and the central axis of the gas nozzle is the first design length S1; the distance between the central axis of the bushing and the end face of the guide rotating part near the gas outlet is the second design length S2.

[0018] According to the auxiliary gas circuit device provided by the present invention, the specific dimensional parameters of the auxiliary gas circuit device conform to the following formula requirements:

[0019] (D2+S2)cosθ+S1sinθ+D1≤H;

[0020] The liquid fuel ejected from the fuel outlet and the gaseous fuel ejected from the gas outlet of the fuel channel form two conical fuel zones. Half of the cone angles of the two conical fuel zones are taken as the atomization edge angle α and the gas edge angle β, respectively. The unburned area after the fuel is ejected from the fuel outlet is the conical atomization zone, and the burned area is the combustion zone. The distance from the fuel outlet to the combustion zone is the ignition initiation distance H. The angle between the central axis of the gas nozzle and the central axis of the fuel outlet is the gas outlet angle θ. The gas outlet angle θ is greater than the gas edge angle β, satisfying β≤θ≤90°.

[0021] According to another aspect of the present invention, a burner is provided, including the auxiliary gas flow device as described in any of the preceding claims, and further including a combustion chamber, wherein the auxiliary gas flow device is installed in the combustion chamber.

[0022] In summary, compared with the prior art, the auxiliary gas circuit device and burner provided by the present invention offer the following advantages:

[0023] 1. The pressure-stabilizing ring cavity is set to be slidable relative to the air flow channel and fuel passage, that is, the gas pipeline is slidable relative to the air flow channel and fuel passage, so that the position of the gas outlet at the second end of the gas pipeline relative to the air and fuel outlets is adjustable. When used for the mixed combustion of liquid and gaseous fuels, the position of the gas outlet can be adjusted according to the specific types of liquid and gaseous fuels and specific operating parameters. Adjusting the position helps to match the liquid and gas fuels to the optimal corresponding position, thereby helping to achieve the best combustion effect.

[0024] 2. The specific matching position relationship between the provided auxiliary gas circuit device and the combustion cylinder allows the auxiliary gas circuit device to be installed both inside and outside the combustion cylinder, improving the flexibility of the installation location and enhancing the applicability of the device;

[0025] 3. Further design the guide structure and make the guide structure a guide rotating component, so that the auxiliary gas circuit device has three degrees of freedom of adjustment, including two translational degrees of freedom and one rotational degree of freedom, to ensure that the gas nozzle can match the conical atomization area of ​​the liquid burner at any angle to achieve the best combustion effect;

[0026] 4. The device has a compact and portable structure, does not require any changes to the existing liquid burner, ensures the reliability of liquid-gas fuel coupling combustion, and the auxiliary gas circuit device can achieve the best combustion effect when matched with conventional liquid burners. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the multi-degree-of-freedom auxiliary gas circuit device suitable for conventional liquid burners provided by the present invention;

[0028] Figure 2 This is a cross-sectional structural diagram of the gas pipeline and annular support provided by the present invention;

[0029] Figure 3 These are schematic diagrams of the overall structure and cross-sectional structure of the guide rotating component provided by the present invention;

[0030] Figure 4 This is a schematic diagram of the overall structure of the constraint positioning ring provided by the present invention;

[0031] Figure 5 This is a schematic diagram of the overall structure of the auxiliary gas circuit device provided by the present invention after it is combined with the combustion cylinder section of the liquid burner;

[0032] Figure 6 This is a schematic cross-sectional view of the auxiliary gas circuit device provided by the present invention after it is combined with the combustion cylinder section of the liquid burner;

[0033] Figure 7 This is a schematic diagram showing the relative positions and relative angles of the gas outlet and the fuel oil outlet provided by the present invention;

[0034] Figure 8 This is a simplified schematic diagram of the auxiliary gas circuit device provided by the present invention;

[0035] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0036] 1-Fixed perforated plate; 11-First positioning threaded hole; 2-Pressure stabilizing ring cavity; 21-Gas inlet; 3-Gas pipeline; 31-Gas straight pipe; 32-Gas hose; 33-Gas nozzle; 34-Gas outlet; 4-Annular bracket; 41-Guide groove; 42-Positioning groove; 43-Support shaft; 5-Guide rotating component; 51-Busset; 52-Second positioning threaded hole; 53-First through hole base; 6-Constraint positioning ring; 61-Matching positioning hole; 62-Second through hole base; 7-Rigid connector; 8-Air flow channel; 81-Air inlet; 82-Swirl vane; 83-Air outlet; 9-High-pressure fuel channel; 91-Fuel inlet; 92-Filter screen; 93-Fuel outlet; 100-Combustion cylinder; 101-Conical atomization area; 102-Combustion area. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0038] Please see Figure 1 and Figure 8 This embodiment provides an auxiliary gas circuit device, which is installed on a burner for liquid-gas mixing combustion. The auxiliary gas circuit device includes a pressure-stabilizing ring cavity 2 and gas pipelines 3. The pressure-stabilizing ring cavity 2 is annular and hollow. One side of the pressure-stabilizing ring cavity 2 is connected circumferentially to the first end of a plurality of gas pipelines 3, and the pressure-stabilizing ring cavity 2 is in communication with the gas pipelines 3. A gas inlet 21 is provided on the pressure-stabilizing ring cavity 2. The burner includes an air flow channel 8 and a fuel passage 9 located in the middle of the air flow channel 8 and extending in the same direction as the air flow channel 8. The extension direction of the gas pipelines 3 is consistent with the extension direction of the air flow channel 8. The walls of the pressure-stabilizing ring cavity 2 and the air flow channel 8 are slidably arranged along the extension direction, and a detachable limiting structure is provided between the walls of the pressure-stabilizing ring cavity 2 and the air flow channel 8. A plurality of gas pipelines 3 are located on the periphery of the air flow channel 8, and the second end of the gas pipeline 3 is bent inward.

[0039] This embodiment takes into account that during liquid-gas mixture combustion, different fuel types result in different combustion characteristics, and the optimal corresponding positions of the liquid and gaseous fuels also differ. Furthermore, when factors such as injection pressure and gas flow rate change, the matching positions of the liquid fuel passage and the gaseous fuel passage need to be adjusted accordingly to ensure optimal combustion performance. Therefore, there is an urgent need for an adjustable liquid-gas coupling mechanism to determine the optimal relative positions during liquid-gas combustion. Based on this, the technical problem this embodiment aims to solve is the difficulty of existing burners matching the optimal corresponding positions when different liquid and gaseous fuels are co-combusted or when combustion parameters change.

[0040] To address this issue, this embodiment proposes that the pressure-stabilizing annular cavity 2 and the gas pipeline 3 be movable relative to the air flow channel 8 and the fuel passage 9. This allows the position of the gas outlet to be adjusted according to actual operating conditions, ensuring optimal alignment with the fuel outlet 93 and guaranteeing combustion efficiency. Furthermore, this embodiment includes multiple gas pipelines 3 surrounding the air flow channel 8, with the second end of each gas pipeline 3 bent inwards. This creates an angle between the gas outlet 34 and the air and fuel outlets, facilitating the mixing of the three combustion media and improving co-combustion performance.

[0041] In some specific embodiments, the burner includes a combustion chamber 100, the air flow channel 8 is formed inside the combustion chamber 100, the pressure stabilizing ring cavity 2 and the gas pipeline 3 are disposed inside the combustion chamber 100 or the pressure stabilizing ring cavity 2 is sleeved outside the combustion chamber 100 such that the gas pipeline 3 is located outside the combustion chamber 100;

[0042] When the pressure stabilizing ring cavity 2 and the gas pipeline 3 are located inside the combustion cylinder 100, the combustion cylinder 100 has an opening corresponding to the gas inlet 21. The pressure stabilizing ring cavity 2 is detachably connected to the air intake pipeline at the gas inlet 21 to achieve air intake, and the air intake pipeline passes through the opening to limit the pressure stabilizing ring cavity 2 and the combustion cylinder 100; detachable limiting can also be achieved through other forms such as threaded connection, etc., and the specific method is not limited.

[0043] When the pressure stabilizing ring cavity 2 is fitted outside the combustion cylinder 100, multiple fixing plates 1 are circumferentially connected to the other side of the pressure stabilizing ring cavity 2. The fixing plates 1 are detachably connected to the combustion cylinder 100 for positioning. The fixing plates 1 are provided with a first positioning threaded hole 11, which has an internal thread and can be screwed into. The screw is used to detachably connect the fixing plates 1 to the combustion cylinder 100 and fix the relative position of the device after adjusting the first translational degree of freedom. The fixing plates 1 can be screwed into the first positioning threaded hole 11, and the position can be defined and detached by the screw pressing against the combustion cylinder 100; alternatively, a single threaded hole can be opened at the corresponding position of the combustion cylinder 100 and the fixing plates 1, while elongated holes or multiple mounting holes are provided on the fixing plates 1 to facilitate position adjustment along the extension direction of the combustion cylinder 100 and ensure the sealing of the combustion cylinder 100; the specific detachable positioning structure is not limited.

[0044] like Figures 1-4 As shown, this embodiment provides an adjustable multi-degree-of-freedom auxiliary gas circuit device suitable for conventional liquid burners, including a fixed orifice plate 1, a pressure stabilizing ring cavity 2, a gas pipeline 3, an annular support 4, a guide rotating component 5, a constraint positioning ring 6, and a rigid connecting component 7.

[0045] refer to Figure 1 and Figure 2 The pressure-stabilizing ring cavity 2 is sleeved on the outside of the combustion cylinder 100. The auxiliary gas circuit device also includes an annular support 4 and a guide structure. The annular support 4 is disposed inside the plurality of gas pipelines 3 and its first end is connected to one side of the pressure-stabilizing ring cavity 2. The guide structure is connected to the second end of the annular support 4 and corresponds one-to-one with the gas pipelines 3. A gas hose 32 is provided between the first end and the second end of the gas pipeline 3. The second end of the gas pipeline 32 passes through the guide structure and is slidably disposed relative to the guide structure.

[0046] refer to Figure 1 and Figure 3 The annular bracket 4 is provided with a positioning groove 42 that penetrates the second end of the annular bracket 4 at a position corresponding to the gas pipeline 3. The second end of the annular bracket 4 is provided with an annular support shaft 43. The guiding structure is provided as a guiding rotating component 5, which has a through hole through which the second end of the gas pipeline 3 passes. The guiding rotating component 5 is also provided with a bushing 51, which is rotatably connected to the support shaft 43. A second positioning threaded hole 52 is provided on the wall of the through hole, and the guiding rotating component 5 achieves fixed positioning of the gas pipeline 3 at the second positioning threaded hole 52.

[0047] refer to Figure 1 , Figure 3 and Figure 4The auxiliary gas circuit device also includes a constraint positioning ring 6 and a rigid connector 7. The constraint positioning ring 6 is sleeved on the outside of the annular bracket 4 and is slidably disposed relative to the annular bracket 4. The constraint positioning ring 6 has an avoidance protrusion at the corresponding position of the gas pipeline 3. The guide rotating member 5 has a first through hole base 53 and the avoidance protrusion has a second through hole base 62. The rigid connector 7 is connected between the first through hole base 53 and the second through hole base 62. The guide rotating member 5 is rotated by the sliding of the constraint positioning ring 6 along the annular bracket 4 to adjust the bending angle of the second end of the gas pipeline 3.

[0048] like Figures 1-4 As shown, the gas enters the pressure-stabilizing ring cavity 2 from the gas inlet 21. The pressure-stabilizing ring cavity 2 has a hollow structure and is connected to the gas pipeline 3. The gas pipeline 3 has a gas outlet 34. Therefore, the gas passes through the gas inlet 21, the hollow inner cavity of the pressure-stabilizing ring cavity 2, and the gas pipeline 3 in sequence, and is finally sprayed out from the gas outlet 34 to mix and burn with the liquid fuel. The fixed orifice plate 1 and the annular bracket 4 are set on the pressure-stabilizing ring cavity 2. The guide rotating component 5 and the annular bracket 4 are connected to each other through the bushing 51 and the support shaft 43 to form a rotating pair. The guide rotating component 5 and the constraint positioning ring 6 are connected to the rigid connecting component 7 through the first through hole base 53 and the second through hole base 62, respectively.

[0049] Specifically, a number of fixed hole plates 1 are arranged in a circumferential array on the outer wall of the voltage stabilizing ring cavity 2. The fixed hole plates 1 and the voltage stabilizing ring cavity 2 are fixedly connected by welding, threaded connection or integral molding, etc., and a first positioning threaded hole 11 is opened on it. The first positioning threaded hole 11 can be screwed into the screw, which is used to adjust the first translational degree of freedom and then fix the relative position of the device.

[0050] Specifically, the pressure-stabilizing ring cavity 2 has an annular cavity inside, which is connected to the internal channel of the gas pipeline 3, and has a through hole as a gas inlet 21. The pressure-stabilizing ring cavity 2 is used to balance the pressure of the gas entering each gas pipeline 3, ensuring that the gas flow at the gas outlet 34 of each gas pipeline 3 is uniform at the same level.

[0051] For example, several gas pipelines 3 are arranged in a circumferential array on the pressure-stabilizing ring cavity 2. Their internal channels are connected to the annular cavity of the pressure-stabilizing ring cavity 2, which is used to introduce gas into the combustion chamber at an appropriate angle and position to ensure that the gas and liquid fuel can achieve a good co-combustion effect. The gas pipeline 3 is composed of a gas straight pipe 31, a gas flexible hose 32, and a gas nozzle 33 connected in sequence. That is, the first end of the gas pipeline is a gas straight pipe, the second end is a gas nozzle, and the end face of the second end forms a gas outlet.

[0052] Specifically, the internal channels of the gas straight pipe 31, gas hose 32, and gas nozzle 33 are interconnected. The gas straight pipe 31 is a rigid metal straight pipe, with one end integrated or welded to the pressure stabilizing ring cavity 2, and the other end connected to the gas hose 32 by welding or threading, etc., to improve the stability and reliability of the gas pipeline 3. The gas hose 32 is a flexible metal hose, with one end connected to the gas straight pipe 31 and the other end connected to the gas nozzle 33 by threading, etc. It has a certain deformation capacity to provide sufficient space for adjusting the second translational and rotational degrees of freedom. One end of the gas nozzle 33 is connected to the gas hose 32, and the other end is set as a gas outlet 34. The gas nozzle 33 is a rigid metal part with a sufficiently long cylindrical section for adjusting the second translational degree of freedom.

[0053] Preferably, the gas nozzle 33 can be used to further improve the gas flow state at the gas outlet 34. A tapered or expanded structure, a spiral structure, or a multi-hole nozzle structure can be provided at the gas outlet 34 to enhance the mixing effect of gas and fuel.

[0054] Specifically, the annular support 4, located on the outer wall of the pressure-stabilizing ring cavity 2, can be welded, threaded, or integrally formed. It has the same number of positioning grooves 42 as the gas pipeline 3, and also includes guide grooves 41 and support shafts 43. The bottom of the annular support 4 is fixed to the side wall of the pressure-stabilizing ring cavity 2, and the top is a ring with a support body. Guide grooves 41 and positioning grooves 42 are located in the middle, providing support for the rotating and sliding joints. The guide grooves 41 are bolted to the mating positioning holes 61 on the constraint positioning ring 6. The guide grooves 41 can be elongated along the extension direction of the gas pipeline 3, providing the space required for the translation of the constraint positioning ring 6. The positioning grooves 42 are located near the gas pipeline 3 to limit the relative position of the gas hose 32 after deformation, improving the reliability of the gas pipeline 3. The support shaft 43 provides support for the guide rotating component 5, and forms a rotating joint with the bushing 51 on the guide rotating component 5. The distance between the support shaft 43 and the central axis of the combustion cylinder 100 of this device is denoted as the eccentric axis distance R.

[0055] Specifically, the guide rotating component 5, acting as a rotating body, cooperates with the support shaft 43 at the top of the annular bracket 4 to form a rotating pair, providing rotational freedom. It has a second positioning threaded hole 52, into which a screw can be screwed to adjust the relative position of the gas nozzle 33 after adjusting the second translational degree of freedom. Its outer wall has a first through-hole base 53 at its tail end. The number of guide rotating components 5 is the same as the number of gas pipelines 3, which are penetrated by the gas nozzle 33. The central axis of the gas nozzle 33 coincides with the central axis of the through hole of the guide rotating component 5, and the two are clearance-fitted.

[0056] The guide rotating component 5 is provided with a bushing 51, a second positioning threaded hole 52, and a first through-hole base 53. The bushing 51 mates with the support shaft 43 to form a rotating pair; the first through-hole base 53 is used to mate with the rigid connecting component 7 to form a rotating pair. (Reference) Figure 3 The distance between the central axis of the through hole of the bushing 51 and the central axis of the gas nozzle 33 is denoted as the first design length S1, and the distance between the central axis of the through hole of the bushing 51 and the end face of the guide rotating member 5 near the gas outlet is denoted as the second design length S2.

[0057] Specifically, the concave portion of the constraint positioning ring 6 has a through hole, namely a mating positioning hole 61. This through hole and the guide groove 41 on the annular bracket 4 can be bolted together to form a sliding pair. The convex portion, namely the outer wall of the clearance protrusion, has a second through hole base 62. The constraint positioning ring 6 has mating positioning holes 61 and second through hole bases 62, and the number of mating positioning holes 61 and second through hole bases 62 can be the same as the number of gas pipelines 3. The mating positioning holes 61 and the guide groove 41 are connected by bolts, so that the constraint positioning ring 6 can be translated within a certain range and then fixed in an appropriate position; the second through hole base 62 is used to connect with the rigid connecting member 7 to form a rotating pair.

[0058] Specifically, one end of the rigid connector 7 engages with the first through-hole base 53 on the guide rotating member 5, and the other end engages with the second through-hole base 62 on the constraint positioning ring 6. This converts the translational degree of freedom of the constraint positioning ring 6 into the rotational degree of freedom of the guide rotating member 5, ensuring the consistency of the gas injection angle. The two ends of the rigid connector 7 engage with the first through-hole base 53 and the second through-hole base 62 respectively to form a rotating pair, which converts the translational motion of the constraint positioning ring 6 into the rotation of the guide rotating member 5, thereby providing rotational degree of freedom.

[0059] like Figure 5 and Figure 6 As shown, the conventional liquid burner has a high-pressure fuel passage 9 and an air passage 8. High-pressure fuel generated by the high-pressure fuel pump is introduced through the fuel inlet 91, filtered by the filter screen 92 to remove impurities, and finally exits through the fuel outlet 93. The fuel outlet 93 has a small inner diameter to form a conical fuel spray, and the central axis of the fuel outlet 93 coincides with the central axis of the combustion chamber 100. High-speed air generated by the fan is introduced through the air inlet 81, and is further agitated by the swirl vanes 82 to form a spiral airflow, which finally exits through the air outlet 83. The high-speed spiral airflow mixes with the conical fuel spray to achieve a better combustion effect.

[0060] In this embodiment of the invention, the central axis of the auxiliary gas circuit device coincides with the central axis of the conventional liquid combustion cylinder 100, and the two are fitted with a clearance. This embodiment of the invention allows for movement relative to the conventional liquid burner, thereby adjusting the first translational degree of freedom. After determining the relative position with the conventional liquid burner, the relative position is fixed by screwing a screw into the first positioning threaded hole 11.

[0061] The combustion chamber 100 provides support and positioning for the embodiments of the present invention. The embodiments of the present invention can only move along the central axis of a conventional liquid combustion chamber and are fixed to the combustion chamber of a conventional liquid burner after the first degree of freedom is adjusted. Therefore, the inner diameter of the embodiments of the present invention is determined by the outer diameter of the conventional liquid combustion chamber, and the length of the embodiments of the present invention can be adjusted accordingly based on the length of the combustion chamber. In this embodiment, the combustion chamber 100 is a cylindrical structure; in other embodiments, it can also be of other shapes, such as a square cross-section. The arrangement of the pressure stabilizing ring cavity 2 and the gas pipeline 3 can be adapted to the shape of the combustion chamber 100, and is not specifically limited.

[0062] like Figure 7 As shown, the liquid fuel ejected from fuel outlet 93 and the gaseous fuel ejected from gas outlet 34 can be approximated as forming two conical fuel zones. Half the cone angles of these two zones are defined as the atomization edge angle α and the gas edge angle β, respectively. The high-pressure fuel does not burn immediately after being ejected from fuel outlet 93; the unburned area is designated as the conical atomization zone 101, and the area where combustion occurs is designated as the combustion zone 102. The distance from fuel outlet 93 to combustion zone 102 is defined as the ignition initiation distance H.

[0063] The angle between the central axis of the gas nozzle 33 and the central axis of the fuel outlet 93 is defined as the gas outlet angle θ. The distance between the central axis of the bushing 51 and the plane containing the fuel outlet 93 is defined as the first positioning distance D1. The length of the gas nozzle 33 extending out of the guide rotating member 5 is defined as the second positioning distance D2. The distance between the central axis of the bushing 51 and the central axis of the combustion chamber is denoted as R.

[0064] The embodiments of the present invention have two translational degrees of freedom and one rotational degree of freedom. Adjusting the first translational degree of freedom can change the magnitude of the first positioning distance D1, and adjusting the second translational degree of freedom can change the magnitude of the second positioning distance D2. These two degrees of freedom ensure that the gas injection position can be freely adjusted within a certain range. Adjusting the rotational degree of freedom can change the magnitude of the gas outlet angle θ, which ensures that the gas injection angle can be freely adjusted within a certain range.

[0065] When adding this embodiment of the invention to a conventional liquid burner, it should be ensured that the embodiment does not affect the normal operation of the original burner, and that better operating performance is achieved when working together. Therefore, the degree of freedom adjustment of this embodiment is limited. The adjustment ranges of the first positioning distance D1, the second positioning distance D2, and the gas outlet angle θ are as follows:

[0066] The first positioning distance D1 and the second positioning distance D2 are used to adjust the relative position of the gas outlet 34 to the fuel outlet 93. The gas nozzle 33 extends beyond the guide rotating member 5 before adjustment can change the gas assist effect; therefore, D2 ≥ 0. To avoid the combustion chamber 100 restricting the guide rotating member 5, D1 ≥ 0. The gas nozzle 33 should avoid direct contact with the conical atomization area 101 to ensure normal atomization of the high-pressure fuel. Therefore, the specific dimensional parameters of the auxiliary gas circuit device satisfy the following formula:

[0067] [(D2+S2)cosθ+S1sinθ+D1]sinα≤R+S1sinθ-(D2+S2)sinθ;

[0068] To prevent the flame from damaging the gas nozzle, the nozzle should not be located in combustion zone 102, therefore the following condition is met:

[0069] (D2+S2)cosθ+S1sinθ+D1≤H;

[0070] To prevent air from flowing back into the gas pipeline 3, the gas outlet angle θ should be less than 90°. However, to avoid the separation of gas and fuel spray and to make full use of the spiral airflow generated by the swirl vane 82, the gas outlet angle θ should be greater than the gas edge angle β. Therefore, β≤θ≤90°.

[0071] Therefore, the translational and rotational degrees of freedom in the embodiments of the present invention can be freely adjusted within a certain range. Different D1, D2, and θ compositions will result in different synergistic combustion effects of fuel oil and gas. Therefore, experiments and simulations can be conducted for different application scenarios to determine the optimal D1, D2, and θ composition based on the best combustion effect.

[0072] In some specific embodiments, the working principle of determining the optimal composition of D1, D2, and θ based on the best combustion effect is as follows:

[0073] Within the adjustable ranges of the first positioning distance D1, the second positioning distance D2, and the gas outlet angle θ, the selectable values ​​of D1, D2, and θ are listed in the form of a finite arithmetic sequence. While ensuring constant fuel and gas flow rates, orthogonal experiments are used to record the combustion effects of the synergistic combustion system under different combinations of D1, D2, and θ. After the experiment, the set of D1, D2, and θ with the best combustion effect is selected as the optimal adjustment result for that fuel and gas combination. Combustion indicators can be selected to evaluate the combustion effect according to actual application needs; no specific limitations are imposed.

[0074] This invention provides an adjustable multi-degree-of-freedom auxiliary gas path device, offering a concept for adjusting the gas auxiliary method using multiple degrees of freedom. Therefore, the types of degrees of freedom can be increased or decreased according to actual needs to suit specific application scenarios. Furthermore, this invention is a mechanically integrated device; where conditions permit, an electronic control unit can be added to adjust the gas and fuel mixture in real time during combustion, improving the device's convenience and intelligence.

[0075] like Figure 8 As shown, after determining the relative positions of the two translational and rotational degrees of freedom, the device can be simplified to a rigid metal structure consisting only of a fixed orifice plate 1, a pressure-stabilizing ring cavity 2, and a gas pipeline 3. This allows it to be used in confined spaces where adjusting the degrees of freedom is inconvenient, while also improving the reliability of the device. Furthermore, the number of gas pipelines 3 can be increased to achieve a more uniform mixing effect. For situations where installation space is limited (the furnace opening is too narrow), the device can be designed inside the combustion chamber 100. In this case, the device can retain only the pressure-stabilizing ring cavity 2 and the gas pipeline 3. The outer ring wall of the device, i.e., the outer wall of the pressure-stabilizing ring cavity 2, is clearance-fitted with the inner wall of the combustion chamber 100. A threaded adapter can be used to connect the combustion chamber 100 to the gas inlet 21 on the pressure-stabilizing ring cavity 2. This threaded connection provides positioning for the first degree of freedom while simultaneously enabling gas intake.

[0076] This invention also provides a burner, which includes the auxiliary gas path device described in any of the above claims, and a combustion chamber, wherein the auxiliary gas path device is installed in the combustion chamber.

[0077] For ease of demonstration, the positioning, guiding, rotational engagement, and moving engagement methods shown in the embodiments of the present invention are all relatively simple examples. In practical applications, more suitable positioning, guiding, rotational engagement, and moving engagement methods can be adopted according to actual needs.

[0078] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An auxiliary gas combustion system device, installed on a burner for liquid-gas mixing and combustion, characterized in that, The device includes a pressure-stabilizing ring cavity and gas pipelines. The pressure-stabilizing ring cavity is annular and hollow. One side of the pressure-stabilizing ring cavity is circumferentially connected to the first ends of multiple gas pipelines, and the pressure-stabilizing ring cavity is in communication with the gas pipelines. A gas inlet is provided on the pressure-stabilizing ring cavity. The burner includes an air flow channel and a fuel passage located in the middle of the air flow channel and extending in the same direction as the air flow channel. The extension direction of the gas pipeline is consistent with the extension direction of the air flow channel. The walls of the pressure-stabilizing ring cavity and the air flow channel are slidably arranged along the extension direction, so that the gas outlet of the second end of the gas pipeline is adjustable relative to the air and fuel outlets. Adjusting the position helps to match the liquid and gas fuel to the optimal corresponding position, thereby achieving the best combustion effect. A detachable limiting structure is provided between the walls of the pressure-stabilizing ring cavity and the air flow channel. Multiple gas pipelines are located on the periphery of the air flow channel, and the second ends of the gas pipelines are bent inward.

2. The auxiliary gas circuit device as described in claim 1, characterized in that, The burner includes a combustion chamber, the air flow channel is formed inside the combustion chamber, the pressure stabilizing ring cavity and the gas pipeline are located inside the combustion chamber or the pressure stabilizing ring cavity is sleeved outside the combustion chamber such that the gas pipeline is located outside the combustion chamber; When the pressure stabilizing ring cavity and the gas pipeline are located inside the combustion cylinder, the combustion cylinder has an opening corresponding to the gas inlet. The pressure stabilizing ring cavity is detachably connected to the gas inlet to allow gas to enter, and the gas inlet pipeline passes through the opening to limit the position of the pressure stabilizing ring cavity and the combustion cylinder. When the pressure stabilizing ring cavity is fitted outside the combustion cylinder, multiple fixing plates are connected circumferentially on the other side of the pressure stabilizing ring cavity. The fixing plates are detachably connected to the combustion cylinder for limiting their position.

3. The auxiliary gas circuit device as described in claim 2, characterized in that, The pressure stabilizing ring cavity is sleeved on the outside of the combustion cylinder. The auxiliary gas circuit device also includes an annular support and a guide structure. The annular support is disposed inside the plurality of gas pipelines and its first end is connected to one side of the pressure stabilizing ring cavity. The guide structure is connected to the second end of the annular support and corresponds one-to-one with the gas pipelines. A gas hose is provided between the first end and the second end of the gas pipeline. The second end of the gas pipeline passes through the guide structure and is slidably disposed relative to the guide structure.

4. The auxiliary gas circuit device as described in claim 3, characterized in that, The first end of the gas pipeline is a straight gas pipe, and the second end is a gas nozzle, with the end face of the second end forming a gas outlet.

5. The auxiliary gas circuit device as described in claim 4, characterized in that, The annular bracket is provided with a positioning groove that passes through the second end of the annular bracket at the location corresponding to the gas pipeline. The second end of the annular bracket is provided with an annular support shaft. The guide structure is provided as a guide rotating component. The guide rotating component is provided with a through hole. The second end of the gas pipeline passes through the through hole. The guide rotating component is also provided with a bushing. The guide rotating component is rotatably connected to the support shaft through the bushing.

6. The auxiliary gas circuit device as described in claim 5, characterized in that, It also includes a constraint positioning ring and a rigid connector. The constraint positioning ring is sleeved on the outside of the annular bracket and is slidably disposed relative to the annular bracket. The constraint positioning ring has a clearance protrusion at the corresponding position of the gas pipeline. The guide rotating member has a first through hole base and the clearance protrusion has a second through hole base. The rigid connector is connected between the first through hole base and the second through hole base. The guide rotating member is rotated by the sliding of the constraint positioning ring along the annular bracket to adjust the bending angle of the second end of the gas pipeline.

7. The auxiliary gas circuit device as described in claim 6, characterized in that, The annular bracket is provided with a long strip-shaped guide groove, and the constraint positioning ring is provided with a mating positioning hole corresponding to the guide groove. The constraint positioning ring is detachably connected to the annular bracket at the mating positioning hole.

8. The auxiliary gas circuit device as described in claim 5, characterized in that, The specific dimensional parameters of the auxiliary gas circuit device conform to the following formula requirements: ； Wherein, the distance between the central axis of the bushing and the plane where the fuel outlet of the fuel channel is located is the first positioning distance D1; the length of the gas nozzle extending out of the guide rotating part is the second positioning distance D2; the distance between the central axis of the bushing and the central axis of the combustion cylinder is R; the angle between the central axis of the gas nozzle and the central axis of the fuel outlet is the gas outlet angle θ; the liquid fuel sprayed from the fuel outlet and the gaseous fuel sprayed from the gas outlet form two conical fuel zones, and half of the cone angle of the conical fuel zone of the liquid fuel is taken as the atomization edge angle α; the distance between the central axis of the bushing and the central axis of the gas nozzle is the first design length S1; the distance between the central axis of the bushing and the end face of the guide rotating part near the gas outlet is the second design length S2.

9. The auxiliary gas circuit device as described in claim 5, characterized in that, The specific dimensional parameters of the auxiliary gas circuit device conform to the following formula requirements: ； The liquid fuel ejected from the fuel outlet and the gaseous fuel ejected from the gas outlet of the fuel channel form two conical fuel zones. Half of the cone angles of the two conical fuel zones are taken as the atomization edge angle α and the gas edge angle β, respectively. The unburned area after the fuel is ejected from the fuel outlet is the conical atomization zone, and the burned area is the combustion zone. The distance from the fuel outlet to the combustion zone is the ignition initiation distance H. The angle between the central axis of the gas nozzle and the central axis of the fuel outlet is the gas outlet angle θ. The gas outlet angle θ is greater than the gas edge angle β, satisfying β≤θ≤90°.

10. A burner, characterized in that, The auxiliary gas circuit device according to any one of claims 1-9 further includes a combustion chamber, wherein the auxiliary gas circuit device is installed on the combustion chamber.

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