Auxiliary fuel gas circuit device and combustor

Abstract

The invention belongs to the related technical field of combustion equipment, and discloses an auxiliary fuel gas circuit device and a combustor, the auxiliary fuel gas circuit device is installed on the combustor used for liquid-gas mixed combustion and comprises a pressure stabilizing ring cavity and fuel gas pipelines, the pressure stabilizing ring cavity is annular and hollow, one side of the pressure stabilizing ring cavity communicates with the first ends of the fuel gas pipelines in the circumferential direction, and the other side of the pressure stabilizing ring cavity communicates with the second ends of the fuel gas pipelines in the circumferential direction; a fuel gas inlet is formed in the pressure stabilizing ring cavity; the combustor comprises an air flow channel and a fuel oil channel located in the middle of the air flow channel, the pressure stabilizing ring cavity and the wall face of the air flow channel are slidably arranged in the extending direction, a detachable limiting structure is arranged between the pressure stabilizing ring cavity and the wall face of the air flow channel, the multiple fuel gas pipelines are located on the periphery of the air flow channel, and the second ends of the fuel gas pipelines are bent inwards. The fuel gas pipeline can slide relative to the air flow channel and the fuel oil channel, the position of the fuel gas outlet can be adjusted according to the types of specific liquid fuel and gaseous fuel and specific working condition parameters, the liquid fuel and the gaseous fuel can be matched to the optimal corresponding position, and the optimal combustion effect is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field related to combustion equipment, and more specifically, relates to an auxiliary fuel gas circuit device and a burner. Background Art

[0002] With the development of renewable energy and clean energy, the fuel options for burners are becoming increasingly diverse, including green methanol, biodiesel, hydrogen, ammonia, etc. Due to the different physical and chemical properties of different fuels, the effects of mixing them with each other are also different. In particular, for boiler systems that use alcohol-hydrogen technology, the application scenarios include single liquid fuel (methanol) and mixed gas fuel (hydrogen and carbon monoxide). Since the combustion characteristics of mixed gas are more complex, a specific combustion method is required to ensure better combustion effects when liquid and gas fuels are mixed and burned.

[0003] Burners that can burn both liquid and gaseous fuels are relatively rare on the market, and face some challenges in practical applications. First of all, these burners have complex structures, high design and manufacturing costs, and are difficult to promote widely in practice. The complex structure not only increases the difficulty of production, but may also bring difficulties in maintenance and operation. Secondly, due to the obvious differences in the combustion characteristics of liquid fuels and gaseous fuels, the blending effect is difficult to guarantee. When the burner handles liquid and gas dual fuels, it is often difficult to achieve uniform mixing and full combustion of the fuel, which may lead to problems such as low combustion efficiency and substandard emissions. These problems limit the application of liquid and gas dual fuel burners, affecting the efficient use of energy and the satisfaction of environmental protection requirements.

[0004] The current mainstream burners usually do not have an adjustment function and use a fixed combination of liquid and gas nozzles. For different liquid fuels and gaseous fuels, their respective combustion characteristics vary greatly. When liquid fuels and gaseous fuels are mixed and burned, it is necessary to combine their respective combustion characteristics and the effect of the mixed combustion to match the best combination of liquid and gas nozzles. Using a fixed combination of liquid and gas nozzles is difficult to ensure that the combustion performance is always maintained at the best level under different liquid and gas fuel mixing modes. In addition, factors such as injection pressure, mixing ratio, gas flow rate, gas mixing type and ratio will also affect the combustion performance of the liquid and gas dual-fuel burner, and the burner needs to be improved accordingly based on actual conditions. Therefore, in the case of mixed combustion of liquid fuels and gaseous fuels, it is often difficult to match the best corresponding position of liquid and gas using a fixed liquid and gas dual-fuel nozzle, making it impossible to achieve the best combustion effect. Summary of the invention

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides an auxiliary fuel gas circuit device and a burner, which are used to solve the problem that when liquid fuel and gaseous fuel are mixed and burned, the existing fixed liquid-gas dual-fuel nozzles are often difficult to match the optimal corresponding positions of liquid and gas, making it impossible to achieve the best combustion effect.

[0006] To achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided an auxiliary gas circuit device, which is installed on a burner for liquid-gas mixed combustion, and includes a pressure-stabilizing ring cavity and a gas pipeline, wherein the pressure-stabilizing ring cavity is an annular and hollow structure, one side of the pressure-stabilizing ring cavity is connected to the first ends of multiple gas pipelines along the circumferential direction, and the pressure-stabilizing ring cavity is communicated with the gas pipeline, and a gas inlet is opened on the pressure-stabilizing ring cavity; the burner includes an air flow channel and a fuel channel 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 pressure-stabilizing ring cavity and the wall surface of the air flow channel are slidably arranged along the extension direction, and a detachable limiting structure is provided between the pressure-stabilizing ring cavity and the wall surface of the air flow channel, multiple gas pipelines are located at the periphery of the air flow channel, and the second end of the gas pipeline is bent inward.

[0007] According to the auxiliary gas circuit device provided by the present invention, the burner includes a combustion tube, the interior of the combustion tube forms the air flow channel, the pressure stabilizing ring cavity and the gas pipeline are arranged inside the combustion tube or the pressure stabilizing ring cavity is sleeved outside the combustion tube so that the gas pipeline is located outside the combustion tube;

[0008] When the pressure-stabilizing ring cavity and the gas pipeline are arranged inside the combustion tube, an opening is arranged on the combustion tube at a position corresponding to the gas inlet, and the pressure-stabilizing ring cavity can be detachably connected to the air intake pipeline at the gas inlet to realize air intake, and the air intake pipeline passes through the opening to realize the position limiting of the pressure-stabilizing ring cavity and the combustion tube;

[0009] When the pressure stabilizing ring cavity is sleeved on the outside of the combustion tube, a plurality of fixed orifice plates are circumferentially connected to the other side of the pressure stabilizing ring cavity, and the fixed orifice plates are detachably connected to the combustion tube for limiting.

[0010] According to the auxiliary gas circuit device provided by the present invention, the pressure-stabilizing ring cavity is sleeved on the outside of the combustion tube, and the auxiliary gas circuit device also includes an annular bracket and a guide structure, the annular bracket is arranged on the inner side of the plurality of gas pipelines and the 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 bracket and corresponds to the gas pipeline one by one, a section of gas hose is provided between the first end and the second end of the gas pipeline, and the second end of the gas pipeline passes through the guide structure and is slidably arranged relative to the guide structure.

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

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

[0013] The auxiliary gas circuit device provided according to the present invention also includes a constraint positioning ring and a rigid connecting member, wherein the constraint positioning ring is sleeved on the outside of the annular bracket and is slidably arranged 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, the avoidance protrusion is provided with a second through hole base, the rigid connecting member is connected between the first through hole base and the second through hole base, and the rotation of the guide rotating member is realized 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 fuel gas circuit device provided by the present invention, the annular bracket is provided with an elongated guide groove, the constraint positioning ring and the guide groove are provided with matching positioning holes at positions corresponding thereto, and the constraint positioning ring is detachably connected to the annular bracket at the matching positioning holes.

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

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

[0017] Among them, the distance between the central axis of the sleeve 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 member is the second positioning distance D2; the distance between the central axis of the sleeve and the central axis of the combustion tube 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 gas fuel sprayed from the gas outlet form two conical fuel areas, and half of the cone angle of the conical fuel area of ​​the liquid fuel is taken as the atomization edge angle α; the distance between the central axis of the sleeve and the central axis of the gas nozzle is the first design length S1; the distance between the central axis of the sleeve and the end face of the guide rotating member close to the gas outlet is the second design length S2.

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

[0019] (D2+S2)cosθ+S1sinθ+D1≤H;

[0020] Among them, the liquid fuel sprayed from the fuel outlet of the fuel channel and the gas fuel sprayed from the gas outlet form two conical fuel areas, and half of the cone angles of the two conical fuel areas are taken as the atomization edge angle α and the gas edge angle β respectively; the unburned area after the fuel is sprayed from the fuel outlet is the conical atomization area, the burning area is the combustion area, and the distance from the fuel outlet to the combustion area is the starting combustion 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, and satisfies β≤θ≤90°.

[0021] According to another aspect of the present invention, a burner is provided, comprising the auxiliary gas circuit device as described in any one of the above, and also comprising a combustion tube, wherein the auxiliary gas circuit device is installed in the combustion tube.

[0022] In general, compared with the prior art, the above technical solutions conceived by the present invention provide auxiliary gas circuit devices and burners:

[0023] 1. The pressure stabilizing ring cavity is arranged to be slidable relative to the air flow channel and the fuel channel, that is, the gas pipeline is slidable relative to the air flow channel and the fuel channel, so that the gas outlet at the second end of the gas pipeline is adjustable relative to the air and fuel outlets. When used for mixed combustion of liquid fuel and gaseous fuel, the position of the gas outlet can be adjusted according to the specific types of liquid fuel and gaseous fuel and specific operating parameters. The position adjustment is conducive to matching the liquid and gas fuels to the best corresponding positions, thereby facilitating the best combustion effect;

[0024] 2. The specific matching position relationship between the auxiliary gas circuit device and the combustion tube enables the auxiliary gas circuit device to be installed inside or outside the combustion tube, which improves the flexibility of the installation position and is conducive to improving the applicability of the device;

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

[0026] 4. The device is compact and portable, and does not require changes to the existing liquid burner, ensuring the reliability of liquid-gas fuel coupled combustion. The auxiliary gas circuit device is used to match the conventional liquid burner to achieve the best combustion effect. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0029] Figure 3 It is a schematic diagram of the overall structure and a schematic diagram of the cross-sectional structure of the guide rotating member provided by the present invention;

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

[0031] Figure 5 It is a schematic diagram of the overall structure after the auxiliary fuel gas circuit device provided by the present invention cooperates with the combustion tube section of the liquid burner;

[0032] Figure 6 It is a schematic cross-sectional structure diagram of the auxiliary fuel gas circuit device provided by the present invention after being matched with the combustion tube section of the liquid burner;

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

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

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

[0036] 1-fixed orifice 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 member; 51-sleeve; 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 plate; 83-air outlet; 9-high-pressure fuel channel; 91-fuel inlet; 92-filter; 93-fuel outlet; 100-combustion tube; 101-conical atomization area; 102-combustion area. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] See also Figure 1 and Figure 8 The present embodiment provides an auxiliary gas circuit device, which is installed on a burner for liquid-gas mixed combustion, and includes a pressure stabilizing ring cavity 2 and a gas pipeline 3. The pressure stabilizing ring cavity 2 is an annular and hollow structure, one side of the pressure stabilizing ring cavity 2 is connected to the first ends of multiple gas pipelines 3 along the circumferential direction, and the pressure stabilizing ring cavity 2 is in communication with the gas pipeline 3, and a gas inlet 21 is provided on the pressure stabilizing ring cavity 2; the burner includes an air flow channel 8 and a fuel channel 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 pipeline 3 is consistent with the extension direction of the air flow channel 8, the pressure stabilizing ring cavity 2 and the wall surface of the air flow channel 8 are slidably arranged along the extension direction, and a detachable limiting structure is provided between the pressure stabilizing ring cavity 2 and the wall surface of the air flow channel 8, multiple 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 when liquid and gas are mixed and burned, the combustion characteristics of the fuels are different when different fuel types are matched, and the optimal corresponding positions of liquid and gas fuels are also different. When factors such as injection pressure and gas flow rate change, the matching positions of the liquid fuel channel and the gas fuel channel also need to be adjusted accordingly to ensure the best combustion performance. Therefore, there is an urgent need for an adjustable liquid-gas coupling mechanism to determine the optimal relative position when liquid and gas are burned. Based on this, the technical problem to be solved by this embodiment is the problem that it is difficult for existing burners to match the optimal corresponding position when different liquid fuels and gaseous fuels are burned in coordination or when the combustion parameters change.

[0040] Based on this problem, this embodiment proposes to set the pressure stabilizing ring cavity 2 and the gas pipeline 3 to be movable relative to the air flow channel 8 and the fuel channel 9, so that the position of the gas outlet can be adjusted according to the actual working conditions, so that it matches the fuel outlet 93 to the best corresponding position to ensure the combustion effect. In addition, this embodiment sets a plurality of gas pipelines 3 on the periphery of the air flow channel 8, and the second end of the gas pipeline 3 is bent inward, so that the direction of the gas outlet 34 forms a certain angle with the direction of the air and fuel outlets, which is conducive to the mixing of the three types of combustion media, thereby improving the mixing effect.

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

[0042] When the pressure-stabilizing ring cavity 2 and the gas pipeline 3 are arranged inside the combustion tube 100, an opening is provided on the combustion tube 100 at a position corresponding to the gas inlet 21, and the pressure-stabilizing ring cavity 2 is detachably connected to the air intake pipeline at the gas inlet 21 to realize air intake, and the air intake pipeline passes through the opening to realize the limiting of the pressure-stabilizing ring cavity 2 and the combustion tube 100; the detachable limiting can also be realized by other forms such as threaded connection, which is not specifically limited.

[0043] When the pressure stabilizing ring cavity 2 is sleeved on the outside of the combustion tube 100, a plurality of fixed orifice plates 1 are connected to the other side of the pressure stabilizing ring cavity 2 along the circumferential direction, and the fixed orifice plates 1 are detachably connected to the combustion tube 100 for limiting. A first positioning threaded hole 11 is provided on the fixed orifice plate 1, and the first positioning threaded hole 11 is provided with an internal thread, which can be screwed into a screw, and is detachably connected to the combustion tube 100 through the screw, and is used to fix the relative position of the device after adjusting the first translational degree of freedom. The fixed orifice plate 1 can be screwed into a screw at the first positioning threaded hole 11, and the screw is pressed against the combustion tube 100 to achieve position limitation and detachability; a single threaded hole can also be opened at the corresponding position of the combustion tube 100 and the fixed orifice plate 1, and a long strip hole or multiple mounting holes can be set on the fixed orifice plate 1, so as to adjust the position along the extension direction of the combustion tube 100 and ensure the sealing of the combustion tube 100; the specific detachable limiting structure is not limited.

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

[0045] refer to Figure 1 and Figure 2 The pressure-stabilizing ring cavity 2 is sleeved on the outside of the combustion tube 100, and the auxiliary gas circuit device also includes an annular bracket 4 and a guide structure. The annular bracket 4 is arranged on the inner side of the plurality of gas pipelines 3 and the 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 bracket 4 and corresponds to the gas pipeline 3 one by one. A section of gas hose 32 is provided between the first end and the second end of the gas pipeline 3, and the second end of the gas pipeline 32 passes through the guide structure and is slidably arranged relative to the guide structure.

[0046] refer to Figure 1 and Figure 3 The annular bracket 4 is provided with a positioning groove 42 penetrating 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 guide structure is set as a guide rotating member 5. The guide rotating member 5 is provided with a through hole. The second end of the gas pipeline 3 passes through the through hole. The guide rotating member 5 is also provided with a sleeve 51. The guide rotating member 5 is rotatably connected to the support shaft 43 through the sleeve 51. A second positioning threaded hole 52 is provided on the hole wall of the through hole. The guide rotating member 5 realizes the fixed limit 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 arranged relative to the annular bracket 4. The constraint positioning ring 6 is provided with an avoidance protrusion at the corresponding position of the gas pipeline 3. The guide rotating member 5 is provided with a first through hole base 53, and the avoidance protrusion is provided with 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 sliding 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 Figure 1-Figure 4 As shown, the gas enters the pressure stabilizing ring cavity 2 from the gas inlet 21. The pressure stabilizing ring cavity 2 is a hollow structure and is connected to the gas pipeline 3. The gas pipeline 3 is provided with 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 finally sprays out from the gas outlet 34 to mix with the liquid fuel for combustion. The fixed orifice plate 1 and the annular bracket 4 are arranged on the pressure stabilizing ring cavity 2. The guide rotating member 5 and the annular bracket 4 are connected to form a rotating pair through the shaft sleeve 51 and the support shaft 43. The guide rotating member 5 and the constraint positioning ring 6 are connected to the rigid connector 7 through the first through-hole base 53 and the second through-hole base 62 respectively.

[0049] Specifically, a plurality of fixed orifice plates 1 are arranged in a circular array on the outer wall of the pressure stabilizing ring cavity 2. The fixed orifice plates 1 and the pressure stabilizing ring cavity 2 are fixedly connected by welding, threaded connection or integral molding, etc. A first positioning threaded hole 11 is opened thereon, and a screw can be screwed into the first positioning threaded hole 11 to fix the relative position of the device after adjusting the first translational degree of freedom.

[0050] Specifically, an annular cavity is provided inside the pressure stabilizing ring cavity 2, which is connected to the internal channel of the gas pipeline 3, and has a through hole as the 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 on each gas pipeline 3 is uniformly at the same level.

[0051] For example, a plurality of gas pipelines 3 are arranged in a circular array on the pressure stabilizing ring cavity 2, and the internal channels thereof are connected to the annular cavity of the pressure stabilizing ring cavity 2, and are used to pass the gas into the combustion chamber at an appropriate angle and position to ensure that the gas and liquid fuel can achieve a better blending effect. The gas pipeline 3 is sequentially connected and composed of a gas straight pipe 31, a gas hose 32 and a gas nozzle 33. That is, the first end of the gas pipeline is set as a gas straight pipe, the second end is set as a gas nozzle, and the end surface of the second end forms a gas outlet.

[0052] Specifically, the internal channels of the straight gas pipe 31, the gas hose 32 and the gas nozzle 33 are connected. The straight gas pipe 31 is a rigid metal straight pipe, one end of which is integrated or welded with the pressure stabilizing ring cavity 2, and the other end is connected to the gas hose 32 by welding or threaded connection, etc., so as to improve the stability and reliability of the gas pipeline 3; the gas hose 32 is a flexible metal hose, one end of which is connected to the straight gas pipe 31, and the other end is connected to the gas nozzle 33 by threaded connection, etc., and it has a certain deformation ability, so as to provide sufficient space for adjusting the second translational degree of freedom and rotational degree 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, and has a cylindrical section long enough to adjust the second translational degree of freedom.

[0053] Preferably, the gas nozzle 33 can be used to subsequently improve the gas flow state at the gas outlet 34. A gradually converging or expanding structure, a spiral structure, a multi-porous nozzle structure, etc. can be set at the gas outlet 34 to enhance the mixing effect of the gas and fuel.

[0054] Specifically, the annular bracket 4 is arranged on the outer wall of the pressure stabilizing ring cavity 2 and can be welded, threaded or integrally formed, etc., and is provided with positioning grooves 42 of the same number as the gas pipeline 3, and is also provided with a guide groove 41 and a support shaft 43. The bottom of the annular bracket 4 is fixed on the side wall of the pressure stabilizing ring cavity 2, and the top is a circular ring with a support body, and the middle is provided with a guide groove 41 and a positioning groove 42, which are used to provide support for the rotation pair and the translation pair. The guide groove 41 is connected to the matching positioning hole 61 on the constraint positioning ring 6 by bolts, and the guide groove 41 can be in a long strip shape along the extension direction of the gas pipeline 3, providing the space required for the translation of the constraint positioning ring 6. The positioning groove 42 is arranged near the gas pipeline 3, and is used to limit the relative position of the gas hose 32 after deformation, so as to improve the reliability of the gas pipeline 3; the support shaft 43 is used to provide support for the guide rotating member 5, and cooperates with the shaft sleeve 51 on the guide rotating member 5 to form a rotation pair, and the distance between the support shaft 43 and the central axis of the combustion tube 100 of the device is recorded as the non-planar axis distance R.

[0055] Specifically, the guide rotating member 5, as a rotating body, cooperates with the support shaft 43 at the top of the annular bracket 4 to form a rotating pair, providing a rotational degree of freedom. A second positioning threaded hole 52 is opened on it, and a screw can be screwed in to adjust the relative position of the gas nozzle 33 after the second translational degree of freedom. A first through-hole base 53 is provided at the rear end of its outer wall. The number of guide rotating members 5 is consistent with the number of gas pipelines 3, and the gas nozzle 33 penetrates through them. The central axis of the gas nozzle 33 coincides with the central axis of the through hole of the guide rotating member 5, and the two are clearance-matched.

[0056] The guide rotating member 5 is provided with a sleeve 51, a second positioning threaded hole 52 and a first through hole base 53. The sleeve 51 cooperates with the support shaft 43 to form a rotating pair; the first through hole base 53 is used to cooperate with the rigid connecting member 7 to form a rotating pair. Figure 3 The distance between the center axis of the through hole of the sleeve 51 and the center axis of the gas nozzle 33 is recorded as the first design length S1, and the distance between the center axis of the through hole of the sleeve 51 and the end face of the guide rotating member 5 adjacent to the gas outlet is recorded as the second design length S2.

[0057] Specifically, a through hole, namely a matching positioning hole 61, is opened in the concave part of the constraint positioning ring 6. The through hole and the guide groove 41 on the annular bracket 4 can cooperate with bolts to form a moving pair. The upper convex part, namely the outer wall of the avoidance protrusion, is provided with a second through hole base 62. The constraint positioning ring 6 is provided with a matching positioning hole 61 and a second through hole base 62, and the number of the matching positioning holes 61 and the second through hole base 62 can be consistent with the number of the gas pipelines 3. The matching positioning hole 61 is connected with the guide groove 41 by bolts, so that the constraint positioning ring 6 can be fixed in an appropriate position after translational movement within a certain range; the second through hole base 62 is used to cooperate with the rigid connector 7 to form a rotating pair.

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

[0059] like Figure 5 and Figure 6 As shown, the conventional liquid burner has a high-pressure fuel channel 9 and an air channel 8. The high-pressure fuel formed by the high-pressure fuel pump is introduced from the fuel inlet 91, and the impurities in the fuel are filtered through the filter 92, and finally leads to the fuel outlet 93. The inner diameter of the fuel outlet 93 is small to form a conical fuel spray. The central axis of the fuel outlet 93 coincides with the central axis of the combustion tube 100. The high-speed air formed by the fan is introduced from the air inlet 81, and the swirl plate 82 strengthens the disturbance to form a spiral airflow, and finally passes out from the air outlet 83. The high-speed spiral airflow is mixed with the conical fuel spray to achieve a better combustion effect.

[0060] The central axis of the auxiliary gas circuit device of the embodiment of the present invention coincides with the central axis of the conventional liquid burner 100, and the two are clearance-matched. The embodiment of the present invention can be moved relative to the conventional liquid burner to adjust the first translational degree of freedom. After determining the relative position with the conventional liquid burner, the relative position of the two is fixed by screwing a screw into the first positioning threaded hole 11.

[0061] The combustion tube 100 provides support and positioning for the embodiment of the present invention. The embodiment of the present invention can only move along the central axis of the conventional liquid combustion tube, and is fixed on the combustion tube of the conventional liquid burner after adjusting the first degree of freedom. Therefore, the inner diameter of the embodiment of the present invention is determined by the outer diameter of the conventional liquid combustion tube, and the length of the embodiment of the present invention can be adjusted accordingly according to the length of the combustion tube. In this embodiment, the combustion tube 100 is a cylindrical structure, and in other embodiments it can also be other shapes, such as a square cross-section, etc. The arrangement of the pressure stabilizing ring cavity 2 and the gas pipeline 3 can be adapted to the shape of the combustion tube 100, and there is no specific limitation.

[0062] like Figure 7 As shown, the liquid fuel sprayed from the fuel outlet 93 and the gas fuel sprayed from the gas outlet 34 can be regarded as forming two conical fuel areas, and half of the cone angles of the two conical fuel areas are defined as the atomization edge angle α and the gas edge angle β. The high-pressure fuel does not burn immediately after being sprayed from the fuel outlet 93. The unburned area is recorded as the conical atomization area 101, and the area where combustion occurs is recorded as the combustion area 102. The distance from the fuel outlet 93 to the combustion area 102 is defined as the initial combustion 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 sleeve 51 and the plane where the fuel outlet 93 is located is defined as the first positioning distance D1, and 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 sleeve 51 and the central axis of the combustion tube is recorded as R.

[0064] The embodiment of the present invention has two translational degrees of freedom and one rotational degree of freedom. Adjusting the first translational degree of freedom can change the size of the first positioning distance D1, and adjusting the second translational degree of freedom can change the size 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 size of the gas outlet angle θ. This degree of freedom ensures that the gas injection angle can be freely adjusted within a certain range.

[0065] For conventional liquid burners, the embodiments of the present invention should be added without affecting the normal operation of the original machine, and at the same time, better operation effects can be achieved as much as possible when working in coordination. Therefore, the degree of freedom of adjustment of the embodiments of the present invention 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 out of the guide rotating member 5 and can be adjusted to change the gas auxiliary effect, so D2≥0; to avoid the combustion tube 100 from restricting the guide rotating member 5, so D1≥0, and the gas nozzle 33 should avoid direct contact with the conical atomization area 101 to ensure the normal atomization of the high-pressure fuel. Therefore, the specific size parameters of the auxiliary gas circuit device meet the following formula:

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

[0068] In order to avoid flame damage to the gas nozzle, the nozzle position should not be in the combustion area 102, so that:

[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°. To avoid stratification of gas and fuel spray and to fully utilize the spiral air flow generated by the swirl blade 82, the gas outlet angle θ should be greater than the gas edge angle β, so β≤θ≤90°.

[0071] Therefore, the translational degrees of freedom and rotational degrees of freedom of the embodiment of the present invention can be freely adjusted within a certain range. Different D1, D2, and θ compositions will lead to different synergistic combustion effects of fuel and gas. Therefore, experiments and simulations can be carried out for different application scenarios, and the optimal D1, D2, and θ composition can be determined by the optimal combustion effect.

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

[0073] Within the adjustable range 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 finite arithmetic progression. Under the condition of ensuring that the fuel flow rate and gas flow rate are constant, the combustion effect of the cooperative combustion system under different D1, D2 and θ compositions is recorded by orthogonal experiment. After the experiment, the group of D1, D2 and θ with the best combustion effect is selected as the best adjustment result under this fuel and gas combination. The combustion index can be selected according to the actual application needs to evaluate the combustion effect, and there is no specific limitation.

[0074] The embodiment of the present invention provides an adjustable multi-degree-of-freedom auxiliary gas circuit device, which provides a way of adjusting the gas auxiliary mode with multiple degrees of freedom, so the types of degrees of freedom can be increased or decreased according to actual needs to meet the actual application scenarios. In addition, the embodiment of the present invention is a mechanical matching part, and if conditions permit, an electronic control unit can be added to adjust the matching mode of gas and fuel in real time during combustion, thereby improving the convenience and intelligence of the device.

[0075] like Figure 8 As shown, after determining the relative positions of the two translational degrees of freedom and the rotational degrees of freedom, the device can be simplified to a rigid metal part with only a fixed orifice plate 1, a pressure-stabilizing ring cavity 2 and a gas pipeline 3, which can be used in a confined space where it is not convenient to adjust the degrees of freedom, while improving the reliability of the device and increasing the number of gas pipelines 3 to achieve a more uniform mixing effect. For situations where the installation space is limited (the furnace mouth is too narrow), the device can be designed in the combustion tube 100. At this time, the device of the present invention can only retain the pressure-stabilizing ring cavity 2 and the gas pipeline 3. The outer ring wall of the device, that is, the outer wall of the pressure-stabilizing ring cavity 2, is in clearance with the inner wall of the combustion tube 100. The threaded adapter can be used to penetrate the combustion tube 100 and connect to the gas inlet 21 on the pressure-stabilizing ring cavity 2. The threaded connection can provide positioning for the first degree of freedom while achieving air intake.

[0076] An embodiment of the present invention further provides a burner, which includes the auxiliary fuel gas circuit device described in any one of the above items, and also includes a combustion tube, wherein the auxiliary fuel gas circuit device is installed in the combustion tube.

[0077] For the sake of ease of demonstration, the positioning method, guiding method, rotational coordination method and movable coordination method shown in the embodiments of the present invention are all relatively simple examples. In actual applications, more appropriate positioning method, guiding method, rotational coordination method and movable coordination method can be adopted in combination with actual needs.

[0078] It will be easily understood by those skilled in the art that the above description is only 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 in the protection scope of the present invention.

Claims

1. An auxiliary gas circuit device, installed on a burner for liquid-gas mixed combustion, characterized in that: The burner comprises an air flow channel and a fuel channel which is located in the middle of the air flow channel and extends 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 pressure-stabilizing ring cavity and the wall surface of the air flow channel can be slidably arranged along the extension direction. A detachable limiting structure is provided 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. The second end of the gas pipeline is bent inward.

2. The auxiliary fuel gas circuit device according to claim 1, characterized in that: The burner comprises a combustion tube, the interior of which forms the air flow channel, the pressure stabilizing ring cavity and the gas pipeline are arranged inside the combustion tube or the pressure stabilizing ring cavity is sleeved outside the combustion tube so that the gas pipeline is located outside the combustion tube; When the pressure-stabilizing ring cavity and the gas pipeline are arranged inside the combustion tube, an opening is arranged on the combustion tube at a position corresponding to the gas inlet, and the pressure-stabilizing ring cavity can be detachably connected to the air intake pipeline at the gas inlet to realize air intake, and the air intake pipeline passes through the opening to realize the position limiting of the pressure-stabilizing ring cavity and the combustion tube; When the pressure stabilizing ring cavity is sleeved on the outside of the combustion tube, a plurality of fixed orifice plates are circumferentially connected to the other side of the pressure stabilizing ring cavity, and the fixed orifice plates are detachably connected to the combustion tube for limiting.

3. The auxiliary fuel gas circuit device according to claim 2, characterized in that: The pressure-stabilizing ring cavity is sleeved on the outside of the combustion tube, and the auxiliary gas circuit device also includes an annular bracket and a guide structure. The annular bracket is arranged on the inner side of the plurality of gas pipelines and the 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 bracket and corresponds to the gas pipelines one by one. A section of gas hose is provided between the first end and the second end of the gas pipeline, and the second end of the gas pipeline passes through the guide structure and is slidably arranged relative to the guide structure.

4. The auxiliary fuel gas circuit device according to claim 3, characterized in that: The first end of the gas pipeline is set as a straight gas pipe, the second end is set as a gas nozzle, and the end surface of the second end forms a gas outlet.

5. The auxiliary fuel gas circuit device according to claim 4, characterized in that: A positioning groove penetrating the second end of the annular bracket is provided at a position corresponding to the annular bracket and the gas pipeline, and a ring-shaped supporting shaft is provided at the second end of the annular bracket. The guide structure is configured as a guide rotating member, and the guide rotating member is provided with a through hole, and the second end of the gas pipeline passes through the through hole. The guide rotating member is also provided with a shaft sleeve, and the guide rotating member is rotatably connected to the supporting shaft through the shaft sleeve.

6. The auxiliary fuel gas circuit device according to claim 5, characterized in that: It also includes a constraint positioning ring and a rigid connecting member, wherein the constraint positioning ring is sleeved on the outside of the annular bracket and is slidably arranged 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, the avoidance protrusion is provided with a second through hole base, the rigid connecting member is connected between the first through hole base and the second through hole base, and the rotation of the guide rotating member is achieved by sliding the constraint positioning ring along the annular bracket to adjust the bending angle of the second end of the gas pipeline.

7. The auxiliary fuel gas circuit device according to 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 matching positioning hole at a position corresponding to the guide groove, and the constraint positioning ring is detachably connected to the annular bracket at the matching positioning hole.

8. The auxiliary fuel gas circuit device according to claim 5, characterized in that: The specific size parameters of the auxiliary fuel gas circuit device meet the requirements of the following formula: [(D2+S2)cosθ+S1sinθ+D1]sinα≤R+S1sinθ-(D2+S2)sinθ; Among them, the distance between the central axis of the sleeve 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 member is the second positioning distance D2; the distance between the central axis of the sleeve and the central axis of the combustion tube 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 gas fuel sprayed from the gas outlet form two conical fuel areas, and half of the cone angle of the conical fuel area of ​​the liquid fuel is taken as the atomization edge angle α; the distance between the central axis of the sleeve and the central axis of the gas nozzle is the first design length S1; the distance between the central axis of the sleeve and the end face of the guide rotating member close to the gas outlet is the second design length S2.

9. The auxiliary fuel gas circuit device according to claim 5, characterized in that: The specific size parameters of the auxiliary fuel gas circuit device meet the requirements of the following formula: (D2+S2)cosθ+S1sinθ+D1≤H; Among them, the liquid fuel sprayed from the fuel outlet of the fuel channel and the gas fuel sprayed from the gas outlet form two conical fuel areas, and half of the cone angles of the two conical fuel areas are taken as the atomization edge angle α and the gas edge angle β respectively; the unburned area after the fuel is sprayed from the fuel outlet is the conical atomization area, the burning area is the combustion area, and the distance from the fuel outlet to the combustion area is the starting combustion 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, and satisfies β≤θ≤90°.

10. A burner, characterized in that: The auxiliary fuel gas circuit device comprises the auxiliary fuel gas circuit device according to any one of claims 1 to 9, and further comprises a combustion tube, wherein the auxiliary fuel gas circuit device is installed in the combustion tube.

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