A head device of a combustion chamber and a combustion chamber

Abstract

The present application relates to the technical field of gas turbines, and particularly relates to a head device of a combustion chamber and a combustion chamber. The head device includes a flame tube, a first fuel pipe, a second fuel pipe and a gas collecting chamber. Among them, the flame tube is provided with an inlet and an outlet, and a combustion chamber is arranged between the inlet and the outlet; the axis of the first fuel pipe coincides with the axis of the flame tube, the discharging end of the first fuel pipe extends into the flame tube, and a plurality of first fuel holes evenly distributed in the circumferential direction are arranged on the side wall of the discharging end; the second fuel pipe is arranged parallel to the first fuel pipe and its discharging end extends into the flame tube; the gas collecting chamber is an annular chamber surrounding the first fuel pipe, the gas collecting chamber is communicated with the discharging end of the second fuel pipe, and a plurality of second fuel holes evenly distributed in the circumferential direction are arranged on the outer peripheral surface of the gas collecting chamber; wherein, taking the end surface of the gas collecting chamber facing away from the second fuel pipe as the outer end surface, the included angle α between the outer end surface and the axial direction of the flame tube is an acute angle, and along the radial direction of the flame tube, the outer end surface extends from the end close to the first fuel pipe towards the direction of the combustion chamber.

Description

Technical Field

[0001] The present application relates to the technical field of gas turbines, and particularly relates to a head device of a combustion chamber and a combustion chamber. Background Art

[0002] Combustion pollution emissions have caused increasingly serious harm to human health and the environment and have received a great deal of attention. Moreover, laws, regulations, and relevant policies regarding the control of pollution emissions have become increasingly strict. Many countries have put forward restrictive requirements for the NO x pollution emission problems of gas turbines. For example, the ability to use hydrogen-containing carbon-free fuels has also become one of the advanced indicators of gas turbines. Hydrogen-containing fuels are chemically active and have a higher flame temperature, a faster flame propagation speed, and a shorter ignition delay time compared with traditional hydrocarbon fuels, resulting in problems such as flashback and high emissions.

[0003] Most existing gas combustion chambers are designed for natural gas and specifically use a two-stage swirler to generate a low-speed recirculation zone to stabilize the flame. This method is not applicable when burning highly reactive fuels (containing 30-40 vol% hydrogen). For example, flashback and high flame temperature can cause equipment damage. Moreover, the flame volume of the existing two-stage swirler is relatively large. When burning hydrogen-containing fuels, it will generate a large-volume high-temperature flame, resulting in an increase in NO x emissions. Therefore, existing gas combustion chambers usually need to be substantially modified to adapt to fuel changes. Summary of the Invention

[0004] The present application discloses a head device of a combustion chamber and a combustion chamber to solve the problems of flashback and high emissions when the existing combustion chamber burns highly reactive fuels.

[0005] To achieve the above object, the present application provides the following technical solutions:

[0006] In a first aspect, the present application provides a head device of a combustion chamber. The head device of the combustion chamber includes a flame tube, a first fuel pipe, a second fuel pipe, and a gas collecting chamber. Among them, the flame tube is provided with an inlet and an outlet, and a combustion chamber is provided between the inlet and the outlet; the axis of the first fuel pipe coincides with the axis of the flame tube, the discharging end of the first fuel pipe extends into the flame tube, and a plurality of first fuel holes are circumferentially and uniformly arranged on the side wall of the discharging end; the second fuel pipe is arranged parallel to the first fuel pipe, and the discharging end of the second fuel pipe extends into the flame tube; the gas collecting chamber is an annular chamber surrounding the first fuel pipe, the gas collecting chamber is communicated with the discharging end of the second fuel pipe, and a plurality of second fuel holes are circumferentially and uniformly arranged on the outer peripheral surface of the gas collecting chamber; among them, with the end surface of the gas collecting chamber facing away from the second fuel pipe as the outer end surface, the angle α between the outer end surface and the axial direction of the flame tube is an acute angle, and along the radial direction of the flame tube, the outer end surface extends from the end close to the first fuel pipe towards the direction of the combustion chamber; the axial direction of the first fuel hole and the radial plane of the flame tube form an angle β 1is an acute angle, and the axial direction of the first fuel hole faces the flame chamber; the included angle β between the axial direction of the second fuel hole and the radial plane of the flame tube 2 is an acute angle, and the axial direction of the second fuel hole faces the flame chamber.

[0007] Further, the included angle α is 60° ≤ α < 90°, and the included angle β 1 is 0 < β 1 ≤ 40°, and the included angle β 2 is 0 < β 2 ≤ 40°.

[0008] Further, the circumferential distance between any two adjacent first fuel holes is L1, and the diameter of the first fuel hole is D1, where L1 ≥ 10D1.

[0009] Further, the circumferential distance between any two adjacent second fuel holes is L2, and the diameter of the second fuel hole is D2, where L2 ≥ 10D2.

[0010] Further, the diameter D1 of the first fuel hole is 0.6 mm ≤ D1 ≤ 1 mm; the diameter D2 of the second fuel hole is 0.6 mm ≤ D2 ≤ 1 mm.

[0011] Further, the number of the second fuel pipes is at least two, and one second fuel pipe is communicated with one gas collecting cavity.

[0012] Further, taking one end of the outer end face close to the first fuel pipe as the first end, and taking the other end of the outer end face far from the first fuel pipe as the second end; along the axial direction of the flame tube, the end face of the first fuel pipe close to the outlet exceeds the first end, and the second end exceeds the end face of the first fuel pipe close to the outlet.

[0013] Further, along the axial direction of the flame tube, the distance between the first end and the second end is L3, and the diameter of the second fuel hole is D2, where 5D2 ≤ L3 ≤ 30D2.

[0014] Further, it further includes a first igniter and a second igniter, the first igniter is used to ignite the gas ejected from the first fuel hole; the second igniter is used to ignite the gas ejected from the second fuel hole.

[0015] In a second aspect, the present application provides a combustion chamber, and this combustion chamber includes the head device of the combustion chamber in the first aspect.

[0016] The head device of the combustion chamber provided by this application. In this device, fuel enters the flame chamber through the first fuel holes and the second fuel holes, that is, fuel is introduced through at least two paths to enhance the adjustment ability under variable load conditions. The fuel flow can be controlled by controlling the fuel valves of different paths, so as to obtain a more reasonable operation curve, better outlet temperature uniformity, and comprehensive performance of NO emissions, CO emissions, and combustion stability.

[0017] A plurality of first fuel holes are circumferentially and uniformly distributed on the side wall of the discharge end of the first fuel pipe, and a plurality of second fuel holes are circumferentially and uniformly distributed on the outer peripheral surface of the gas collecting chamber. The ejected fuel mixes with air to form a flame with a smaller volume. The first fuel holes are located at the end of the first fuel pipe, and the second fuel holes are located on the outer peripheral surface of the gas collecting chamber. After the fuel ejected from the first fuel holes and the second fuel holes mixes with air, the flame cannot enter the first fuel pipe or the second fuel pipe, thereby suppressing the flashback phenomenon. In addition, by controlling the extending directions of the first fuel holes and the second fuel holes, the jet depth of the fuel and the jet momentum ratio with air are regulated, so as to regulate the position and shape of the flame. At the same time, the extending direction of the outer end surface of the gas collecting chamber is regulated to change the flow velocity of the air flow and form a recirculation zone on the side of the outer end surface facing the flame chamber. The mixed gas after the fuel ejected from the fuel holes mixes with air forms a stable small-volume flame at the shear layer position between two adjacent recirculation zones under the action of the recirculation zone, which helps to reduce NO x emissions. Description of the Drawings

[0018] Figure 1 It is a sectional view of the head device of the combustion chamber according to an embodiment of this application;

[0019] Figure 2 It is Figure 1 a partial enlarged view at A in

[0020] Figure 3 It is a partial sectional view of the head device of the combustion chamber according to an embodiment of this application;

[0021] Figure 4 It is a schematic diagram of the distance between two adjacent second fuel holes of the gas collecting chamber according to an embodiment of this application;

[0022] Figure 5 It is a schematic diagram of the position of the flame and the recirculation zone of the head device of the combustion chamber according to an embodiment of this application;

[0023] Figure 6 It is a streamline diagram of the flow field of the cross-section of the combustion chamber according to an embodiment of this application;

[0024] Figure 7 It is an isothermal line distribution diagram of the cross-section of the combustion chamber according to an embodiment of this application;

[0025] Figure 8 This is the temperature contour map of the combustion cross-section of the combustion chamber according to an embodiment of the present application.

[0026] Reference numerals in the drawings: 100 - flame tube; 110 - mounting plate; 120 - first section; 130 - second section; 140 - third section; 150 - fourth section; 200 - first fuel pipe; 300 - second fuel pipe; 400 - gas collecting chamber; 410 - outer end face; 411 - first end; 412 - second end; 500 - air passage; 510 - first passage; 520 - second passage; 530 - third passage; 600 - first igniter; 610 - ignition electrode; 620 - insulator; 630 - mounting part; 700 - second igniter; 800 - head flange; 900 - casing assembly; 910 - casing flange; 920 - casing body;

[0027] 01 - inlet; 02 - outlet; 03 - first fuel hole; 04 - second fuel hole; 05 - first air inlet hole; 06 - second air inlet hole; 07 - third air inlet hole; 08 - recirculation zone; 09 - flame. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0029] Figure 1 This is a sectional view of the head device of the combustion chamber according to an embodiment of the present application. Figure 2 is Figure 1 a partial enlarged view of part A in Figure 3 This is a partial sectional view of the head device of the combustion chamber according to an embodiment of the present application. Refer to Figures 1 to 3, in the embodiment of the present application, a head device of a combustion chamber is provided. The head device of the combustion chamber includes a flame tube 100, a first fuel pipe 200, a second fuel pipe 300, and a gas collecting chamber 400. Among them, the flame tube 100 is provided with an inlet 01 and an outlet 02, and a combustion chamber is between the inlet 01 and the outlet 02; taking the direction of the incoming gas as the front, that is, one end of the inlet 01 of the flame tube 100 is the front end, and one end of the outlet 02 of the flame tube 100 is the rear end; the axis of the first fuel pipe 200 coincides with the axis of the flame tube 100, and the discharging end of the first fuel pipe 200 extends into the flame tube 100, and a plurality of first fuel holes 03 are circumferentially and uniformly arranged on the side wall of the discharging end; the second fuel pipe 300 is arranged in parallel with the first fuel pipe 200, and the discharging end of the second fuel pipe 300 extends into the flame tube 100; the gas collecting chamber 400 is an annular chamber surrounding the first fuel pipe 200, the gas collecting chamber 400 is communicated with the discharging end of the second fuel pipe 300, and a plurality of second fuel holes 04 are circumferentially and uniformly arranged on the outer peripheral surface of the gas collecting chamber 400; among them, the gas collecting chamber 400 is preferably a toroidal rotating body chamber. After the fuel gas is ejected from the second fuel holes 04, it can be evenly dispersed in the flame tube 100.

[0030] Among them, the gas collecting chamber and the second fuel pipe can be integrally formed or can be a split structure, and are connected by a connecting piece, which is convenient for disassembly.

[0031] Referring to Figure 2 , among them, taking the end face of the gas collecting chamber 400 facing away from the second fuel pipe 300 as the outer end face 410, the outer end face 410 faces the combustion chamber, taking the end face of the gas collecting chamber 400 facing the second fuel pipe 300 as the inner end face, the inner end face is communicated with the second fuel pipe 300, and the included angle α between the outer end face 410 and the axis direction of the flame tube 100 is an acute angle. Along the radial direction of the flame tube 100, the outer end face 410 extends from the end close to the first fuel pipe 200 towards the direction of the combustion chamber to control the size of the recirculation zone formed behind the outer end face 410, thereby controlling the position of the flame. Specifically, the degree of the included angle α is set according to the flame speed. Exemplarily, when the hydrogen ratio in the fuel is different, the flame propagation speed changes, and the size of the recirculation zone is adjusted by adjusting the degree of the included angle α, thereby adjusting the root position of the flame. Preferably, 60° ≤ α < 90°.

[0032] Continue to refer to Figure 2 , the included angle β between the axis direction of the first fuel hole 03 and the radial plane of the flame tube 100 1 is an acute angle, and the axis direction of the first fuel hole 03 faces the combustion chamber to adjust the jet depth of the fuel, thereby adjusting the jet momentum ratio of air to fuel, and further adjusting the position, length, and shape of the flame. Preferably, the included angle β 2 is 0 < β 1 ≤ 40°.

[0033] The included angle β between the axial direction of the second fuel hole 04 and the radial plane of the flame tube 100 2 is an acute angle, and the axial direction of the second fuel hole 04 faces the combustion chamber to adjust the jet depth of the fuel, thereby adjusting the jet momentum ratio of air to fuel, and further adjusting the position, length and shape of the flame. Preferably, the included angle β 2 is such that 0 < β 2 ≤ 40°.

[0034] It can be understood that the included angle β 1 and the included angle β 2 can be the same or different. Their sizes are designed according to the type of fuel.

[0035] Continuing to refer to Figure 1 and Figure 2 , taking the wall surface of the gas collecting chamber 400 facing away from the first fuel pipe 200 as the outer peripheral surface and the wall surface of the gas collecting chamber 400 facing the first fuel pipe 200 as the inner peripheral surface, the end of the outer peripheral surface of the gas collecting chamber 400 extends towards the direction close to the first fuel pipe 200 to form an inclined surface section. The second fuel hole 04 is arranged on the above-mentioned inclined surface section. This inclined surface section helps the gas ejected from the second fuel hole 04 to be more smoothly ejected into the flame tube 100 and reduces damage to other components. Since the axial direction of the second fuel hole 04 is perpendicular to the wall surface of the inclined surface section, therefore, the included angle between this inclined surface section and the axial direction of the flame tube 100 is equal to the included angle β 2 between the axial direction of the second fuel hole 04 and the radial plane of the flame tube 100. Among them, the second fuel hole 04 is only arranged on the outer peripheral surface of the gas collecting chamber 400, and no fuel hole is arranged on the inner peripheral surface to prevent the distance between adjacent flames from being too close and converging into a larger flame.

[0036] In some embodiments of the present application, the circumferential distance between any two adjacent first fuel holes 03 is L1, and the diameter of the first fuel hole 03 is D1, where L1 ≥ 10D1, so that the circumferential distance between adjacent first fuel holes 03 is relatively far, and the flames formed by the fuel ejected from each first fuel hole 03 will not converge with the flames formed by the fuel ejected from adjacent first fuel holes 03, avoiding the formation of a larger flame, but maintaining small-volume flames.

[0037] Figure 4 is a schematic diagram of the distance between two adjacent second fuel holes 04 of the gas collecting chamber 400 in an embodiment of the present application. Refer to Figure 4, the circumferential distance between any two adjacent second fuel holes 04 is L2, and the diameter of the second fuel hole 04 is D2, where L2 ≥ 10D2, so that the circumferential distance between adjacent second fuel holes 04 is relatively far, and the flames formed by the fuel ejected from each second fuel hole 04 will not converge with the flames formed by the fuel ejected from adjacent second fuel holes 04, avoiding the formation of a larger flame, but maintaining a small-volume flame.

[0038] In some embodiments of the present application, the diameter D1 of the first fuel hole 03 is 0.6 mm ≤ D1 ≤ 1 mm; the diameter D2 of the second fuel hole 04 is 0.6 mm ≤ D2 ≤ 1 mm. If the hole diameter is too small, it will cause an increase in the fuel jet depth and an increase in the flame volume; conversely, if the hole diameter is too large, the flame will be too close to the wall of the first fuel pipe or the outer end face of the gas collecting cavity. In short, too large or too small will cause the temperature of the wall or the outer end face to be too high, an increase in emissions, etc. The diameters of the first fuel hole and the second fuel hole are determined according to the fuel composition and properties.

[0039] To reduce the impact of the gas ejected from the first fuel hole 03 on the second fuel pipe 300, and at the same time make the gas jet to the area behind the second fuel pipe 300, the first fuel hole 03 is arranged at the discharge end of the first fuel pipe 200, the diameter of the first fuel hole 03 is D1, and the linear distance S1 between the center of the outlet of the first fuel hole 03 and the end of the first fuel pipe 200 is S1 = 4D1 - 5D1.

[0040] To reduce the impact of the gas ejected from the second fuel hole 04 on the side wall of the flame tube 100, and at the same time make the gas jet in the direction of the outlet 02 of the flame tube 100, the second fuel hole 04 is arranged at the end of the gas collecting cavity 400, the diameter of the second fuel hole 04 is D2, and the linear distance S2 between the center of the outlet of the second fuel hole 04 and the end of the gas collecting cavity 400 is S2 = 4D2 - 5D2.

[0041] In some embodiments of the present application, the end face of the first fuel pipe 200 close to the outlet 02 of the flame tube 100 is provided with a TBC thermal barrier coating to increase its temperature resistance and extend its service life.

[0042] In some embodiments of the present application, the number of second fuel pipes is at least two, and one second fuel pipe is communicated with one gas collecting cavity. It can be understood that multiple second fuel pipes arranged along the circumferential direction of the flame tube can be communicated with one gas collecting cavity. Setting two or more second fuel pipes in the present application can introduce fuel through multiple paths. At partial load, only the first fuel pipe or some second fuel pipes can be selected to be opened. When at full load, all fuel pipes can be opened to fully supply gas. By regulating the fuel flow of different paths, the combustion adjustment flexibility and the unit performance can be increased.

[0043] Continue to refer to Figure 1, the head device of the combustion chamber further includes a head flange 800 and a casing assembly 900. The flame tube 100 is disposed within the casing assembly 900. The casing assembly 900 includes a casing body 920 and a casing flange 910 connected to the casing body 920. The casing body 920 is connected to the head flange 800 through the casing flange 910. The casing body 920 is sleeved on the flame tube 100, and there is a gap between them. The flame tube 100 is connected to the head flange 800 through a mounting plate 110, and the end of the mounting plate 110 away from the flame tube 100 is disposed between the head flange 800 and the casing flange 910 to fix the flame tube 100. The first fuel pipe 200 and the second fuel pipe 300 both pass through the head flange 800 and extend into the interior of the flame tube 100.

[0044] Among them, along the direction from the inlet 01 to the outlet 02 of the flame tube 100, the flame tube 100 includes a first section 120, a second section 130, a third section 140, and a fourth section 150 connected in sequence. The opening is disposed at the end of the first section 120 close to the head flange 800, and the outlet 02 is disposed at the end of the fourth section 150 away from the head flange 800. The inner diameter of the first section 120 is smaller than the average inner diameter of the second section 130. Along the direction from the inlet 01 to the outlet 02, the inner diameter of the second section 130 gradually increases until it is equal to the inner diameter of the third section 140. The inner diameter of the fourth section 150 gradually decreases until it is smaller than the inner diameter of the first section 120, and an outlet 02 section is formed. The end of the mounting plate 110 away from the head flange 800 is connected to the end of the third section 140 close to the second section 130, and an air inlet cavity is formed by enclosing between the mounting plate 110, the head flange 800, and the flame tube 100.

[0045] Optionally, a plurality of first air inlets 05 are circumferentially and uniformly distributed on the side wall of the portion of the third section 140 close to the second section 130, and a plurality of second air inlets 06 are circumferentially and uniformly distributed at the end of the third section 140 close to the fourth section 150. The diameter of the second air inlets 06 is larger than that of the first air inlets 05, and the number of the first air inlets 05 is more than that of the second air inlets 06. The air entering from the gap between the casing body 920 and the combustion chamber liner 100 can enter the combustion chamber liner 100 through the first air inlets 05 and the second air inlets 06 and be used as wall cooling air and mixing air respectively. In addition, the mounting plate 110 is provided with circumferentially and uniformly distributed third air inlets 07, and the air can enter the air inlet cavity through the third air inlets 07. Then, the air enters the interior of the combustion chamber liner 100 through the air passage 500 between the side wall of the combustion chamber liner 100, the first fuel pipe 200, and the second fuel pipe 300. Among them, a first passage 510 is formed by surrounding the outer wall of the first fuel pipe 200 and the second fuel pipe 300, a second passage 520 is formed by surrounding the side walls of any two adjacent second fuel pipes 300, and a third passage 530 is formed by surrounding the outer wall of the second fuel pipe 300 close to the side wall of the combustion chamber liner 100 and the inner wall of the first section 120 of the combustion chamber liner 100. The air entering along the inlet 01 enters the combustion chamber from the first passage 510, the second passage 520, and the third passage 530, providing an oxidant for the combustion of the fuel injected from the first fuel holes 03 and the second fuel holes 04.

[0046] Continue to refer to Figure 2 , taking the end face of the gas collecting cavity 400 facing away from the second fuel pipe 300 as the outer end face 410, the end of the outer end face 410 close to the second fuel pipe 300 as the first end 411, and the end of the outer end face 410 far from the second fuel pipe 300 as the second end 412; taking the end of the outer end face 410 close to the first fuel pipe 200 as the first end 411, and the end of the outer end face 410 far from the first fuel pipe 200 as the second end 412; along the axial direction of the combustion chamber liner 100, the end face of the first fuel pipe 200 close to the outlet 02 extends beyond the first end 411, and the second end 412 extends beyond the end face of the first fuel pipe 200 close to the outlet 02. At the same time, because the outer end face 410 is an inclined surface and the first fuel holes 03 are arranged at the end of the first fuel pipe 200, the fuel ejected from the first fuel holes 03 can be ejected to the area behind the outer end face 410, reducing the impact on the second fuel pipe 300.

[0047] Among them, along the axial direction of the combustion chamber liner 100, the distance between the first end 411 and the second end 412 is L3, and the diameter of the second fuel holes 04 is D2, where 5D2 ≤ L3 ≤ 30D2.

[0048] Figure 5 It is a schematic diagram of the positions of the flame and the recirculation zone of the head device of the combustion chamber according to an embodiment of the present application. Refer to Figure 5, with the direction of the inlet 01 of the combustion chamber liner 100 as the front, the direction of the outlet 02 of the combustion chamber liner 100 as the rear, the side facing the first fuel pipe 200 as the inner side, and the side away from the first fuel pipe 200 as the outer side. Among them, the number of the second fuel pipes 300 is two, the outer end face 410 of the gas collecting cavity 400 is an inclined plane, and a recirculation zone 08 is formed behind the outer end face 410; a recirculation zone 08 is formed behind the discharging end of the first fuel pipe 200, and a recirculation zone 08 is formed behind the inner wall of the second section 130 of the combustion chamber liner 100.

[0049] When 5D2 ≤ L3 ≤ 30D2, that is, when the angle α between the outer end face 410 and the axial direction is 60° ≤ α < 90°, the gas Q2 ejected from the second fuel hole 04 is mixed with the air Q1 to form a mixed gas Q3. The flow direction of the mixed gas Q3 is towards the rear and biased towards the outer side. First, the mixed gas Q3 is restricted by the outer recirculation zone 08 and deflects towards the inner side along the direction D, and then is restricted by the inner recirculation zone 08. Therefore, under the combined action of the two recirculation zones 08, the root of the flame 09 is fixed at a position close to the gas collecting cavity 400 located on the inner side, that is, the flame 09 is formed at the shear layer position between the two recirculation zones 08. When L3 = 0, that is, the outer end face 410 is parallel to the radial direction of the combustion chamber liner 100, at this time, the flame 09 will expand or the flame will be close to the outer end face 410, rather than being suspended between the two recirculation zones 08, resulting in an increase in the volume of the high-temperature zone, burning out of the outer end face of the gas collecting cavity or the first fuel pipe, and an increase in NO x emissions.

[0050] Figure 6 is the flow field streamline diagram of the cross-section of the combustion chamber of an embodiment of the present application, Figure 7 is the isothermal line distribution diagram of the cross-section of the combustion chamber of an embodiment of the present application, Figure 8 is the temperature cloud diagram of the combustion cross-section of the combustion chamber of an embodiment of the present application. Referring to Figures 6 to 8 together, the gas enters the combustion chamber liner 100 from the air passage 500 and forms a small-volume flame under the action of the recirculation zone. Figure 8 The area where the isothermal lines are relatively dense in

[0051] is the flame. It can be seen that the position with a large temperature gradient is the flame edge. The combustion chamber head device in the present application can reduce the damage of the flame to the outer end face 410 of the gas collecting cavity 400. Figure 1 and Figure 3, the head device of the combustion chamber in the embodiments of the present application further includes a first igniter 600 and a second igniter 700. The first igniter 600 includes a mounting portion 630 fixed to the head flange 800, an insulator 620 connected to the mounting portion 630, and an ignition electrode 610 provided on the insulator 620 away from the mounting portion 630. The insulator 620 extends from the mounting portion 630 towards the first fuel pipe 200. The ignition electrode 610 is opposite to the first fuel hole 03 to ignite the gas ejected from the first fuel hole 03. Among them, the ignition electrode 610 can be a metal electrode, and the insulator 620 can be a ceramic insulating material. The second igniter 700 is perpendicular to the side wall of the casing body 920 and extends into the combustion chamber 100 after passing through the side wall of the mechanical body, so that the second igniter 700 is used to ignite the gas ejected from the second fuel hole 04. It can be understood that the design of the dual igniters can significantly improve the probability of successful ignition.

[0052] Based on the same concept, the embodiments of the present application also provide a combustion chamber, which includes the head device of the combustion chamber in various possible embodiments of the present application.

[0053] Because it includes the head device of the combustion chamber in the embodiments of the present application, the combustion chamber in the present application has the following advantages:

[0054] 1) Fuel is introduced through at least two paths to improve the adjustment ability under variable load conditions. By controlling the fuel valves of different paths, the fuel flow rate can be regulated to obtain a more reasonable operation curve, better outlet temperature uniformity, and combustion stability.

[0055] 2) Through the structural design of the outer end surface of the gas collecting chamber, a recirculation zone is formed behind it, and stable small-volume flames are formed at the shear layer positions between two adjacent recirculation zones, which helps to reduce NO x emissions;

[0056] 3) The spacing between any two adjacent first fuel holes and the spacing between any two adjacent second fuel holes both maintain specific dimensions to achieve a micro-combustion mixing combustion mode, avoiding the merging of adjacent small-volume flames into large-volume flames, thereby reducing NO x emissions, and the first fuel holes are provided at the ends of the first fuel pipe, and the second fuel holes are provided at the ends of the second fuel pipe, which can avoid flashback.

[0057] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these changes and modifications.

Claims

1. A head device of a combustion chamber, characterized in that, it includes: a flame tube, provided with an inlet and an outlet, and a combustion chamber is between the inlet and the outlet; a first fuel pipe, the axis of the first fuel pipe coincides with the axis of the flame tube, the discharging end of the first fuel pipe extends into the flame tube, and a plurality of first fuel holes evenly distributed in the circumferential direction are provided on the side wall of the discharging end; a second fuel pipe, the second fuel pipe is arranged parallel to the first fuel pipe, and the discharging end of the second fuel pipe extends into the flame tube; a gas collecting chamber, the gas collecting chamber is an annular chamber surrounding the first fuel pipe, the gas collecting chamber is communicated with the discharging end of the second fuel pipe, and a plurality of second fuel holes evenly distributed in the circumferential direction are provided on the outer peripheral surface of the gas collecting chamber; the second fuel holes are arranged at the end of the gas collecting chamber; wherein, taking the end face of the gas collecting chamber facing away from the second fuel pipe as the outer end face, the included angle α between the outer end face and the axial direction of the flame tube is an acute angle, and along the radial direction of the flame tube, the outer end face extends from the end close to the first fuel pipe towards the direction of the combustion chamber; The included angle β between the axial direction of the first fuel hole and the radial plane of the flame tube 1 is an acute angle, and the axial direction of the first fuel hole faces the combustion chamber; The included angle β between the axial direction of the second fuel hole and the radial plane of the flame tube 2 is an acute angle, and the axial direction of the second fuel hole faces the combustion chamber.

2. The head device of the combustion chamber according to claim 1, characterized in that, The included angle α is 60° ≤ α < 90°, and the included angle β 1 is 0 < β 1 ≤ 40°, and the included angle β 2 is 0 < β 2 ≤ 40°.

3. The head device of the combustion chamber according to claim 1, characterized in that, the circumferential distance between any two adjacent first fuel holes is L1, the diameter of the first fuel hole is D1, wherein, L1≥10D1.

4. The head device of the combustion chamber according to claim 1, characterized in that, the circumferential distance between any two adjacent second fuel holes is L2, the diameter of the second fuel hole is D2, wherein, L2≥10D2.

5. The head device of the combustion chamber according to claim 3 or 4, characterized in that, the diameter D1 of the first fuel hole is 0.6mm≤D1≤1mm; the diameter D2 of the second fuel hole is 0.6mm≤D2≤1mm.

6. The head device of the combustion chamber according to claim 5, characterized in that, the number of the second fuel pipes is at least two, and one second fuel pipe is communicated with one gas collecting chamber.

7. The head device of the combustion chamber according to claim 5, characterized in that, taking the end of the outer end face close to the first fuel pipe as the first end, and taking the end of the outer end face far from the first fuel pipe as the second end; along the axial direction of the flame tube, the end face of the first fuel pipe close to the outlet exceeds the first end, and the second end exceeds the end face of the first fuel pipe close to the outlet.

8. The head device of the combustion chamber according to claim 7, characterized in that, along the axial direction of the flame tube, the distance between the first end and the second end is L3, the diameter of the second fuel hole is D2, wherein, 5D2≤L3≤30D2.

9. The head device of the combustion chamber according to claim 7, characterized in that, it further includes a first igniter and a second igniter, the first igniter is used to ignite the gas ejected from the first fuel holes; the second igniter is used to ignite the gas ejected from the second fuel holes.

10. A combustion chamber, characterized in that, it includes the head device of the combustion chamber according to any one of claims 1-9.

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