Combustion system, combustion device, combustion plate and design method thereof

Abstract

The invention relates to a combustion system, a combustion device, a combustion plate and a design method thereof.The combustion plate comprises a first combustion hole, the first combustion hole comprises a throat section and a flaring section, and the flaring section is located on the downstream of the throat section in the gas flowing direction; and the ratio of the sectional area of the air outlet end of the throat section to the sectional area of the air outlet end of the flaring section is 0.1-1. The design method of the combustion plate comprises the steps that the preset number N of the first combustion holes is obtained according to the preset total flow Q, the preset total flow velocity V and the preset diameter D of the first combustion holes; n is rounded to obtain a corrected actual number M; and the total area of the first combustion holes after correction is obtained. The combustion device comprises the combustion plate. The combustion system comprises the combustion device. According to the combustion system, the combustion device, the combustion plate and the design method thereof, the flame separation phenomenon is avoided, it is guaranteed that the gas flow speed of the throat section is larger than the turbulent flame propagation speed, and backfire is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of hot water equipment, and in particular to a combustion system, a combustion device, a combustion plate and a design method thereof. Background Art

[0002] Fully premixed combustion technology has been widely used in gas heating furnaces and gas water heaters. However, in existing fully premixed gas water heaters, after the power of the combustion system is adjusted, the flame of the fire hole of the combustion plate is unstable and cannot meet the combustion requirements well. Summary of the invention

[0003] Based on this, it is necessary to provide a combustion system, a combustion device, a combustion plate and a design method thereof to address the problem that the existing combustion system cannot meet the combustion requirements well.

[0004] A combustion plate includes a first combustion hole, which includes a throat section and a flared section. The flared section is located downstream of the throat section along the gas flow direction, and the ratio of the cross-sectional area of ​​the throat section outlet end to the cross-sectional area of ​​the flared section outlet end is in the range of 0.1 to 1.

[0005] In the above-mentioned combustion plate, the gas flows to the throat section and then flows through the expansion section. Since the cross-sectional area of ​​the throat section outlet end is smaller than that of the expansion section outlet end, the gas flow rate can be reduced along the gas flow direction, so that the flame is not easily blown away by the airflow during combustion, thereby avoiding the flame separation phenomenon. By limiting the ratio range of the cross-sectional area of ​​the throat section outlet end to the cross-sectional area of ​​the expansion section outlet end, the size design of the first combustion hole can be optimized on the basis of avoiding the flame separation phenomenon, while ensuring that the gas flow rate of the throat section is greater than the turbulent flame propagation speed, thereby avoiding backfire.

[0006] In one of the embodiments, the ratio of the cross-sectional area of ​​the throat section outlet end to the cross-sectional area of ​​the expansion section outlet end is 0.375.

[0007] In one embodiment, the throat section includes a first end and a second end arranged opposite to each other along the flow direction of the gas, and the expansion section includes a third end and a fourth end arranged opposite to each other along the flow direction of the gas, the third end is connected to the second end, the cross-sectional areas of the second end, the first end and the third end are equal, and the ratio of the cross-sectional area of ​​the second end to the cross-sectional area of ​​the fourth end is 0.375.

[0008] In one of the embodiments, along the flow direction of the gas, the cross-sectional areas of the throat sections are equal, and the cross-sectional area of ​​the expansion section gradually increases.

[0009] In one embodiment, the combustion plate also includes a second combustion hole, and the combustion plate has a first combustion mode and a second combustion mode; when in the first combustion mode, one of the fuel gas and the combustion-supporting gas is output from the second combustion hole, and the other of the fuel gas and the combustion-supporting gas is output from the first combustion hole; when in the second combustion mode, a mixture of the fuel gas and the combustion-supporting gas is output from the first combustion hole or the second combustion hole.

[0010] In one of the embodiments, the ratio of the cross-sectional area of ​​the throat section to the cross-sectional area of ​​the second combustion hole is in the range of 0.25-4.

[0011] In one of the embodiments, the ratio of the cross-sectional area of ​​the throat section outlet end to the cross-sectional area of ​​the second combustion hole outlet end is 0.75.

[0012] In one of the embodiments, the ratio of the cross-sectional area of ​​the gas outlet end of the expansion section to the cross-sectional area of ​​the gas outlet end of the second combustion hole is in the range of 0.625-10.

[0013] In one of the embodiments, the ratio of the cross-sectional area of ​​the gas outlet end of the expansion section to the cross-sectional area of ​​the gas outlet end of the second combustion hole is 2.

[0014] In one of the embodiments, the cross-sectional areas of the second combustion holes are equal along the flow direction of the gas.

[0015] In one embodiment, the number of the second combustion holes and the number of the first combustion holes are at least two, and the second combustion holes and the first combustion holes are distributed along the same direction.

[0016] In one embodiment, the ratio of the number of the first combustion holes to the number of the second combustion holes ranges from 0.5 to 2.

[0017] In one embodiment, the ratio of the number of the first combustion holes to the number of the second combustion holes is 1.083.

[0018] In one embodiment, the cross section of the gas outlet end of the second combustion hole is a circular cross section, and the diameter of the gas outlet end of the second combustion hole ranges from 0.002m to 0.01m.

[0019] In one of the embodiments, the cross-section of the throat section air outlet end is a circular cross-section, and the diameter of the throat section air outlet end ranges from 0.002m to 0.008m.

[0020] In one of the embodiments, the cross section of the gas outlet end of the expanded section is a circular cross section, and the diameter of the gas outlet end of the expanded section ranges from 0.008 m to 0.02 m.

[0021] A design method of the combustion plate is characterized by comprising:

[0022] According to the preset total flow rate Q, the preset total flow velocity V and the preset diameter D of the first combustion hole, the preset number N of the first combustion hole is obtained = (Q / V) / (πD 2 / 4);

[0023] Round N to get the corrected actual number M;

[0024] Get the total area M*(πD of the first combustion hole after correction 2 / 4).

[0025] The above-mentioned design method of the combustion plate can optimize the size design of the first combustion hole on the basis of avoiding the flame separation phenomenon by limiting the ratio range of the cross-sectional area of ​​the throat section outlet end to the cross-sectional area of ​​the expansion section outlet end, thereby ensuring that the gas flow rate in the throat section is greater than the turbulent flame propagation speed and avoiding backfire.

[0026] A combustion device comprises the above-mentioned combustion plate.

[0027] The above-mentioned combustion device can optimize the size design of the first combustion hole by limiting the ratio range of the cross-sectional area of ​​the throat section outlet end to the cross-sectional area of ​​the expansion section outlet end, thereby avoiding the flame separation phenomenon, ensuring that the gas flow rate in the throat section is greater than the turbulent flame propagation speed, and avoiding backfire.

[0028] A combustion system comprises the above combustion device.

[0029] The above-mentioned combustion system can optimize the size design of the first combustion hole by limiting the ratio range of the cross-sectional area of ​​the throat section outlet end to the cross-sectional area of ​​the expansion section outlet end, thereby avoiding the flame separation phenomenon, ensuring that the gas flow rate in the throat section is greater than the turbulent flame propagation speed, and avoiding backfire. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of a combustion system in one embodiment.

[0031] Figure 2 for Figure 1 Schematic diagram of the combustion device in the combustion system shown.

[0032] Figure 3 for Figure 2 A front view of the combustion device shown.

[0033] Reference numerals:

[0034] 10. Combustion device; 20. Air supply device; 100. Combustion plate; 110. First combustion hole; 111. Throat section; 111a. First end; 111b. Second end; 112. Expanding section; 112a. Third end; 112b. Fourth end; 120. Second combustion hole. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0036] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0038] In this application, unless otherwise clearly specified and limited, the terms "initial", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0040] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0041] Please refer to Figures 1 to 3 In one embodiment, the combustion plate 100 includes a first combustion hole 110, and the first combustion hole 110 includes a throat section 111 and a flared section 112. The flared section 112 is located downstream of the throat section 111 along the gas flow direction, and the ratio of the cross-sectional area of ​​the gas outlet end of the throat section 111 to the cross-sectional area of ​​the gas outlet end of the flared section 112 is in the range of 0.1 to 1.

[0042] It should be noted that the gas flow direction is Figure 2 and Figure 3 In the Z direction, the cross-sectional area is the opening area of ​​the first combustion hole 110 on the XY cross section, wherein the XY cross section is perpendicular to the Z direction.

[0043] Here, the expansion section 112 being located downstream of the throat section 111 along the gas flow direction means that along the gas flow direction, the gas flows to the throat section 111 and then flows through the expansion section 112 .

[0044] In the above-mentioned combustion plate 100, the gas flows to the throat section 111 and then flows through the expansion section 112. Since the cross-sectional area of ​​the air outlet end of the throat section 111 is smaller than the cross-sectional area of ​​the air outlet end of the expansion section 112, the gas flow rate can be reduced along the gas flow direction, so that the flame is not easily blown away by the airflow during combustion, thereby avoiding the flame separation phenomenon. By limiting the ratio range of the cross-sectional area of ​​the air outlet end of the throat section 111 to the cross-sectional area of ​​the air outlet end of the expansion section 112, the size design of the first combustion hole 110 can be optimized on the basis of avoiding the flame separation phenomenon, while ensuring that the gas flow rate of the throat section 111 is greater than the turbulent flame propagation speed, thereby avoiding backfire.

[0045] In this embodiment, the first combustion hole 110 is in a conical frustum shape. In other embodiments, the first combustion hole 110 may also be in other shapes.

[0046] Specifically, please refer to Figure 2 and Figure 3 The ratio of the cross-sectional area of ​​the air outlet end of the throat section 111 to the cross-sectional area of ​​the air outlet end of the expansion section 112 is 0.375.

[0047] It is understandable that if the ratio of the cross-sectional area of ​​the outlet end of the throat section 111 to the cross-sectional area of ​​the outlet end of the expansion section 112 is too small, that is, the cross-sectional areas of the two outlet ends are not much different, the gas flow rate reduction effect will not be obvious; if the ratio of the cross-sectional area of ​​the outlet end of the throat section 111 to the cross-sectional area of ​​the outlet end of the expansion section 112 is too large, that is, the cross-sectional areas of the two outlet ends are greatly different, it will affect the stability of the gas flow. Through the above settings, the ratio of the cross-sectional area of ​​the outlet end of the throat section 111 to the cross-sectional area of ​​the outlet end of the expansion section 112 is limited to an optimal value, which can reduce the gas flow rate while ensuring the stability of the gas flow.

[0048] Specifically, please refer to Figure 2 and Figure 3 The throat section 111 includes a first end 111a and a second end 111b which are arranged opposite to each other along the flow direction of the gas, and the expansion section 112 includes a third end 112a and a fourth end 112b which are arranged opposite to each other along the flow direction of the gas, the third end 112a is connected to the second end 111b, the cross-sectional areas of the second end 111b, the first end 111a and the third end 112a are equal, and the ratio of the cross-sectional area of ​​the second end 111b to the cross-sectional area of ​​the fourth end 112b is 0.375.

[0049] It should be noted that the cross-sectional area refers to the inner diameter of the throat section 111 and the expansion section 112 in the XY cross section.

[0050] It can be understood that the first end 111a is configured as the air inlet end of the first combustion hole 110, and the fourth end 112b is configured as the air outlet end of the first combustion hole 110. The gas enters the throat section 111 from the first end 111a, and flows through the second end 111b, the third end 112a and the fourth end 112b in sequence. Since the cross-sectional areas of the second end 111b, the first end 111a and the third end 112a are equal, and the cross-sectional area of ​​the fourth end 112b is greater than the cross-sectional area of ​​the second end 111b, the flow rate will decrease when the gas is output from the fourth end 112b. Through the above-mentioned setting, the ratio of the cross-sectional area of ​​the second end 111b to the cross-sectional area of ​​the fourth end 112b is limited to an optimal value, which can reduce the gas flow rate while ensuring the stability of the gas flow, avoiding the occurrence of flame separation, and at the same time ensuring that the gas flow rate of the throat section 111 is greater than the turbulent flame propagation speed, avoiding backfire.

[0051] Please refer to Figure 2 and Figure 3, along the flow direction of the gas, the cross-sectional area of ​​the throat section 111 is equal, and the cross-sectional area of ​​the expansion section 112 gradually increases.

[0052] Here, along the flow direction of the gas, the cross-sectional area of ​​the expanding section 112 gradually increases, and the change of the cross-sectional area of ​​the expanding section 112 can be linear or nonlinear.

[0053] In this embodiment, the throat section 111 is cylindrical, and the expansion section 112 is conical truncated cone. In other embodiments, the throat section 111 and the expansion section 112 may also be in other shapes.

[0054] For further information, please refer to Figure 2 and Figure 3 The combustion plate 100 further includes a second combustion hole 120. The combustion plate 100 has a first combustion mode and a second combustion mode. In the first combustion mode, one of the fuel gas and the combustion-supporting gas is output from the second combustion hole 120, and the other of the fuel gas and the combustion-supporting gas is output from the first combustion hole 110; in the second combustion mode, a mixed gas of the fuel gas and the combustion-supporting gas is output from the first combustion hole 110 or the second combustion hole 120.

[0055] For example, when the first combustion mode is adopted, the combustion-supporting gas is output from the first combustion hole 110, and the fuel gas is output from the second combustion hole 120. At this time, the combustion plate is in diffusion combustion, ensuring that the flame is stable during diffusion combustion. At this time, when the combustion-supporting gas is output from the first combustion hole 110, due to the increase in the cross-sectional area of ​​the first combustion hole 110, the flow rate of the combustion-supporting gas is reduced, so that the flame is not easily blown away by the airflow during diffusion combustion, avoiding the occurrence of flame separation, and the contact time between the combustion-supporting gas and the fuel gas ejected from the second combustion hole 120 is increased, the combustion is more complete, and less exhaust gas is generated.

[0056] When the second combustion mode is adopted, the mixture of fuel gas and combustion-supporting gas is outputted from the first combustion hole 110 or the second combustion hole 120. At this time, the combustion plate is in premixed combustion, which can shorten the flame length during premixed combustion and achieve stable combustion. At this time, when the mixture of fuel gas and combustion-supporting gas is outputted from the first combustion hole 110, due to the increase in the cross-sectional area of ​​the first combustion hole 110, the flow rate of the mixture gradually decreases, avoiding the flame separation phenomenon. At the same time, the mixture is fully mixed before combustion and then ejected from the first combustion hole 110, achieving stable combustion while effectively shortening the length of the combustion flame.

[0057] In addition, when the heat load demand is small, turning on the first combustion mode will not easily cause backfire; when the heat load demand is large, turning on the second combustion mode can effectively reduce the generation of exhaust gas.

[0058] Optionally, the fuel gas is fuel gas, and the combustion-supporting gas is air and / or oxygen.

[0059] Please refer to Figure 2 and Figure 3 The ratio of the cross-sectional area of ​​the gas outlet end of the throat section 111 to the cross-sectional area of ​​the gas outlet end of the second combustion hole 120 is in the range of 0.25 to 4.

[0060] It can be understood that when the first combustion mode is adopted, the combustion-supporting gas is outputted from the first combustion hole 110, and the fuel gas is outputted from the second combustion hole 120; when the second combustion mode is adopted, the mixed gas of the fuel gas and the combustion-supporting gas is outputted from the first combustion hole 110 or the second combustion hole 120. By limiting the range of the ratio of the cross-sectional area of ​​the throat section 111 to the cross-sectional area of ​​the second combustion hole 120, the airflow flowing through the second combustion hole 120 can be ensured to be stable.

[0061] Preferably, the ratio of the cross-sectional area of ​​the gas outlet end of the throat section 111 to the cross-sectional area of ​​the gas outlet end of the second combustion hole 120 is 0.75.

[0062] Please refer to Figure 2 and Figure 3 The ratio of the cross-sectional area of ​​the outlet end of the expansion section 112 to the cross-sectional area of ​​the outlet end of the second combustion hole 120 is in the range of 0.625 to 10. By limiting the ratio of the cross-sectional area of ​​the outlet end of the expansion section 112 to the cross-sectional area of ​​the outlet end of the second combustion hole 120, the airflow through the second combustion hole 120 can be ensured to be stable.

[0063] Preferably, the ratio of the cross-sectional area of ​​the gas outlet end of the expansion section 112 to the cross-sectional area of ​​the gas outlet end of the second combustion hole 120 is 2.

[0064] For details about the embodiments, please refer to Figure 2 and Figure 3 , along the flow direction of the gas, the cross-sectional areas of the second combustion holes 120 are equal.

[0065] In this embodiment, the second combustion hole 120 is cylindrical. In other embodiments, the second combustion hole 120 may also be in other shapes.

[0066] Please refer to Figure 2 and Figure 3 The number of the second combustion holes 120 and the number of the first combustion holes 110 are both at least two, and each second combustion hole 120 and each first combustion hole 110 are distributed along the same direction.

[0067] In this embodiment, the second combustion hole 120 and the first combustion hole 110 are arranged along Figure 2 The X direction and / or Y direction are alternately distributed, Figure 2 The X direction is the length direction of the combustion device 100. Figure 2The Y direction is the width direction of the combustion device 100. In this way, it can effectively ensure that the air ejected from the first combustion hole 110 and the gas ejected from the second combustion hole 120 are evenly distributed during diffusion combustion, which is conducive to the uniform mixing of air and gas, and avoids the shortening of the life of the combustion device 100 due to uneven temperature distribution during combustion of the combustion device 100. At the same time, the second combustion holes 120 and the first combustion holes 110 are alternately distributed along the same direction, which can ensure that the first combustion holes 110 are evenly distributed in the combustion device 100, thereby ensuring that the mixed gas ejected from the first combustion hole 110 is evenly distributed in the combustion device 100, and avoids the shortening of the life of the combustion device 100 due to uneven temperature distribution during combustion of the combustion device 100.

[0068] In other embodiments, the second combustion holes 120 and the first combustion holes 110 may also be distributed in other ways, for example: the first combustion zone formed by the second combustion holes 120 and the second combustion zone formed by the first combustion holes 110 are distributed left and right along the length direction of the combustion device 100 or left and right along the width direction; or there are at least two first combustion zones and at least two second combustion zones, the first combustion zone includes at least two second combustion holes 120, and the second combustion zone includes at least two first combustion holes 110, and the first combustion zone or the second combustion zone is evenly distributed on the combustion device 100.

[0069] Specifically in the embodiment, the ratio of the number of the first combustion holes 110 to the number of the second combustion holes 120 ranges from 0.5 to 2.

[0070] Preferably, the ratio of the number of the first combustion holes 110 to the number of the second combustion holes 120 is 1.083.

[0071] For details about this embodiment, please refer to Figure 2 and Figure 3 The cross section of the gas outlet end of the second combustion hole 120 is a circular cross section, and the diameter of the gas outlet end of the second combustion hole 120 ranges from 0.002m to 0.01m. In other embodiments, the cross section of the gas outlet end of the second combustion hole 120 can also be a square or other shapes.

[0072] For details about this embodiment, please refer to Figure 2 and Figure 3 The cross section of the throat section 111 at the gas outlet is a circular cross section, and the diameter of the throat section 111 at the gas outlet ranges from 0.002m to 0.008m. In other embodiments, the cross section of the throat section 111 at the gas outlet can also be a square or other shapes.

[0073] For details about this embodiment, please refer to Figure 2 and Figure 3The cross section of the outlet end of the expanded section 112 is a circular cross section, and the diameter of the outlet end of the expanded section 112 ranges from 0.008 m to 0.02 m. In other embodiments, the cross section of the outlet end of the expanded section 112 can also be a square or other shapes.

[0074] Please refer to Figures 1 to 3 A design method of the combustion plate 100 includes:

[0075] According to the preset total flow rate Q, the preset total flow velocity V and the preset diameter D of the first combustion hole 110, the preset number N of the first combustion hole 110 is obtained = (Q / V) / (πD 2 / 4);

[0076] Round N to get the corrected actual number M;

[0077] Get the total area M*(πD of the first combustion hole 110 after correction 2 / 4).

[0078] It should be noted that when optimizing the design of the first combustion hole 110, it is necessary to ensure that the flame of the first combustion hole 110 does not flash back or flame out under any working condition, that is, the flow rate and the flame propagation speed in the first combustion hole 110 are compared so that both are within a preset range. By correcting the cross-sectional area of ​​the first combustion hole 110 and limiting the cross-sectional area of ​​the first combustion hole 110 to a preset range, the flame flashback and flame out can be improved.

[0079] For example, the preset total flow rate Q1 at the outlet of the throat section 111 is 0.0023565 m 3 / s, the preset total flow velocity V1 of the throat section 111 = 5m / s, and the preset diameter D1 of the air outlet end of the throat section 111 = 0.003m, then:

[0080] The preset number N1 of the first combustion holes 110 = (Q1 / V1) / (πD1 2 / 4)=66.67;

[0081] After rounding N1, the actual number of the first combustion holes 110 is obtained as M1=66;

[0082] Get the total area M1*(πD1 of the first combustion hole 110 after correction 2 / 4)=0.000459458m 2 ;

[0083] Among them, the preset diameter of the outlet end of the expansion section 112 is D2, and the preset diameter of the outlet end of the second combustion hole 120 is D3. The calculation method of the corrected total area of ​​the expansion section 112 and the second combustion hole 120 is the same as the calculation method of the throat section 111, which will not be repeated here.

[0084] Please refer to Figure 1 and Figure 2 , a combustion device 10 in one embodiment includes the above-mentioned combustion plate 100.

[0085] Specifically, the combustion device 10 also includes a shell, in which a combustion chamber, a first wind chamber and a second wind chamber are arranged. The second wind chamber is connected to the air inlet end of the first combustion hole 110, the first wind chamber is connected to the air inlet end of the second combustion hole 120, and the air outlet ends of the first combustion hole 110 and the second combustion hole 120 are both connected to the combustion chamber.

[0086] For example, when in the first combustion mode, the gas is output to the combustion chamber through the first wind chamber and the second combustion hole 120, and the air is output to the combustion chamber through the second wind chamber and the first combustion hole 110. At this time, the air and gas are diffused and burned; when in the second combustion mode, the mixture of air and gas is output to the combustion chamber through the second wind chamber and the first combustion hole 110. At this time, the air and gas are premixed and burned.

[0087] In the above-mentioned combustion device 10, the gas flows to the throat section 111 and then flows through the expansion section 112. Since the cross-sectional area of ​​the air outlet end of the throat section 111 is smaller than the cross-sectional area of ​​the air outlet end of the expansion section 112, the gas flow rate can be reduced along the gas flow direction, so that the flame is not easily blown away by the airflow during combustion, thereby avoiding the flame separation phenomenon; by limiting the ratio range of the cross-sectional area of ​​the air outlet end of the throat section 111 to the cross-sectional area of ​​the air outlet end of the expansion section 112, the size design of the first combustion hole 110 can be optimized on the basis of avoiding the flame separation phenomenon, thereby ensuring that the gas flow rate of the throat section 111 is greater than the turbulent flame propagation speed, thereby avoiding backfire.

[0088] Please refer to Figure 1 and Figure 2 , please refer to Figure 1 and Figure 2 , a combustion system in one embodiment includes the combustion device 10 described above.

[0089] It should be noted that, in addition to the above-mentioned combustion device 10, the combustion system also includes other components such as a heat exchange system, a control system, and a detection system.

[0090] In the above-mentioned combustion system, the gas flows to the throat section 111 and then flows through the expansion section 112. Since the cross-sectional area of ​​the air outlet end of the throat section 111 is smaller than the cross-sectional area of ​​the air outlet end of the expansion section 112, the gas flow rate can be reduced along the gas flow direction, so that the flame is not easily blown away by the airflow during combustion, thereby avoiding the flame separation phenomenon. By limiting the ratio range of the cross-sectional area of ​​the air outlet end of the throat section 111 to the cross-sectional area of ​​the air outlet end of the expansion section 112, the size design of the first combustion hole 110 can be optimized on the basis of avoiding the flame separation phenomenon, thereby ensuring that the gas flow rate of the throat section 111 is greater than the turbulent flame propagation speed, thereby avoiding backfire.

[0091] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0092] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A combustion plate (100), characterized in that: include: The first combustion hole (110) comprises a throat section (111) and a flared section (112), wherein the flared section (112) is located downstream of the throat section (111) along the gas flow direction, and the ratio of the cross-sectional area of ​​the gas outlet end of the throat section (111) to the cross-sectional area of ​​the gas outlet end of the flared section (112) is in the range of 0.1 to 1.

2. The combustion plate (100) according to claim 1, characterized in that: The ratio of the cross-sectional area of ​​the air outlet end of the throat section (111) to the cross-sectional area of ​​the air outlet end of the expansion section (112) is 0.

375.

3. The combustion plate (100) according to claim 1, characterized in that: The throat section (111) comprises a first end (111a) and a second end (111b) which are arranged opposite to each other along the flow direction of the gas, and the expansion section (112) comprises a third end (112a) and a fourth end (112b) which are arranged opposite to each other along the flow direction of the gas, the third end (112a) is connected to the second end (111b), the second end (111b), the first end (111a) and the third end (112a) have the same cross-sectional area, and the ratio of the cross-sectional area of ​​the second end (111b) to the cross-sectional area of ​​the fourth end (112b) is 0.

375.

4. The combustion plate (100) according to any one of claims 1 to 3, characterized in that: Along the flow direction of the gas, the cross-sectional area of ​​the throat section (111) is equal, and the cross-sectional area of ​​the expansion section (112) gradually increases.

5. The combustion plate (100) according to claim 4, characterized in that The combustion plate (100) further includes a second combustion hole (120), and the combustion plate (100) has a first combustion mode and a second combustion mode; when in the first combustion mode, one of the fuel gas and the combustion-supporting gas is outputted from the second combustion hole (120), and the other of the fuel gas and the combustion-supporting gas is outputted from the first combustion hole (110); when in the second combustion mode, a mixture of the fuel gas and the combustion-supporting gas is outputted from the first combustion hole (110) or the second combustion hole (120).

6. The combustion plate (100) according to claim 5, characterized in that The ratio of the cross-sectional area of ​​the gas outlet end of the throat section (111) to the cross-sectional area of ​​the gas outlet end of the second combustion hole (120) is in the range of 0.25 to 4.

7. The combustion plate (100) according to claim 5, characterized in that The ratio of the cross-sectional area of ​​the gas outlet end of the throat section (111) to the cross-sectional area of ​​the gas outlet end of the second combustion hole (120) is 0.

75.

8. The combustion plate (100) according to claim 5, characterized in that The ratio of the cross-sectional area of ​​the gas outlet end of the expansion section (112) to the cross-sectional area of ​​the gas outlet end of the second combustion hole (120) is in the range of 0.625 to 10.

9. The combustion plate (100) according to claim 5, characterized in that The ratio of the cross-sectional area of ​​the gas outlet end of the expansion section (112) to the cross-sectional area of ​​the gas outlet end of the second combustion hole (120) is 2.

10. The combustion plate (100) according to claim 5, characterized in that Along the flow direction of the gas, the cross-sectional areas of the second combustion holes (120) are equal.

11. The combustion plate (100) according to claim 5, characterized in that The number of the second combustion holes (120) and the number of the first combustion holes (110) are both at least two, and each of the second combustion holes (120) and each of the first combustion holes (110) are distributed along the same direction.

12. The combustion plate (100) according to claim 11, characterized in that The ratio of the number of the first combustion holes (110) to the number of the second combustion holes (120) is in the range of 0.5 to 2.

13. The combustion plate (100) according to claim 11, characterized in that The ratio of the number of the first combustion holes (110) to the number of the second combustion holes (120) is 1.

083.

14. The combustion plate (100) according to claim 5, characterized in that The cross section of the gas outlet end of the second combustion hole (120) is a circular cross section, and the diameter of the gas outlet end of the second combustion hole (120) ranges from 0.002 m to 0.01 m.

15. The combustion plate (100) according to claim 1, characterized in that The cross section of the air outlet end of the throat section (111) is a circular cross section, and the diameter of the air outlet end of the throat section (111) ranges from 0.002 m to 0.008 m.

16. The combustion plate (100) according to claim 1, characterized in that The cross section of the gas outlet end of the expanded section (112) is a circular cross section, and the diameter of the gas outlet end of the expanded section (112) ranges from 0.008 m to 0.02 m.

17. A method for designing a combustion plate (100) according to any one of claims 1 to 16, characterized in that: include: According to the preset total flow rate Q, the preset total flow velocity V and the preset diameter D of the first combustion hole (110), the preset number N of the first combustion hole (110) is obtained = (Q / V) / (πD 2 / 4); Round N to get the corrected actual number M; Obtain the total area M*(πD of the first combustion hole (110) after correction 2 / 4).

18. A combustion device (10), characterized in that: It comprises a combustion plate (100) as claimed in any one of claims 1 to 16.

19. A combustion system, characterized in that: Comprising a combustion device (10) as claimed in claim 18.

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