Wide-range on-duty flame combustion system

Abstract

The wide-range on-duty flame combustion system comprises an on-duty combustion chamber, an igniter, a flame detection device, a flow divider and a combustor, the flow divider is of a hollow structure with two open ends and comprises an airflow inlet portion and an airflow outlet portion which are communicated, the airflow outlet portion is located in the on-duty combustion chamber, and the combustor is located in the airflow inlet portion. The airflow outlet part comprises a main flow hole wall and a flow dividing ring wall which are communicated, the main flow hole wall extends towards the interior of the flow divider at the joint of the main flow hole wall and the flow dividing ring wall to form a blocking shoulder, secondary flow holes are formed in the periphery of the flow dividing ring wall, and main flow holes are formed in the main flow hole wall. Main flow holes and secondary flow holes are formed through the flow divider, total premixed gas enters the flow divider, most of the total premixed gas is sprayed out through the main flow holes, a small part of the total premixed gas is sprayed out from the secondary flow holes located in the side wall of the flow dividing ring wall under the blocking effect of the blocking shoulder, and flow dividing of the total premixed gas is achieved. And the igniter ignites the secondary flow premixed gas, so that the secondary flow premixed gas is combusted and serves as a stable flame root, the main flow premixed gas is ignited to form jet flow premixed flame, and combustion is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of petrochemical duty flame technology, and in particular to a wide-range duty flame combustion system. Background Technology

[0002] Traditional standby flame combustion systems may experience difficulties in stable ignition and combustion when faced with a wide range of factors, such as fluctuations in gas pressure (from 10 kPa to 300 kPa), fluctuations in internal burner pressure (from negative to positive pressure), fluctuations in fuel composition (from low carbon to high hydrogen), changes in altitude, and changes in ambient humidity.

[0003] Existing technologies, such as CN113237095A, disclose an ignition device, flame detection method, and combustion system. This system includes a main fuel pipe, a secondary fuel pipe, and an ignition rod, employing diffusion combustion and utilizing combustion air from the burner as the supply air. To achieve two-stage fuel injection, a main fuel pipe and a secondary fuel pipe are required. The secondary fuel pipe injects ignition fuel, while the main fuel pipe injects the primary fuel. During the ignition process, the ignition fuel in the secondary fuel pipe is first ignited by the ignition rod. The flame from the secondary fuel pipe then ignites the primary fuel in the main fuel pipe, and the flames from both pipes combine to form an ignition flame. The inclusion of the main and secondary fuel pipes complicates the device. Utility Model Content

[0004] In view of this, the present invention aims to propose a wide-range duty flame combustion system to solve the problem of complex structure of duty flame combustion system under wide operating conditions.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A wide-range standby flame combustion system includes a standby combustion chamber, an igniter, a flame detection device, a distributor, and a burner. The standby combustion chamber has an open upper end and a base at the lower end. The igniter and flame detection device are located inside the standby combustion chamber. The distributor is a hollow structure with open ends, including a connected airflow inlet and an airflow outlet. The airflow inlet extends out of the base, and the airflow outlet is located inside the standby combustion chamber. The airflow outlet includes a connected main flow orifice wall and a distribution ring wall. The main flow orifice wall extends towards the interior of the distributor at the connection between the main flow orifice wall and the distribution ring wall to form a shoulder. Secondary flow orifices are provided on the outer periphery of the distribution ring wall, and a main flow orifice is formed inside the main flow orifice wall. Utilizing the main flow orifice and secondary flow orifice formed by the distributor, the total premixed gas enters the distributor. Most of it is ejected through the main flow orifice, while a small portion is blocked by the shoulder and ejected from the secondary flow orifices located on the side wall of the distribution ring wall, thus achieving the distribution of the total premixed gas. The igniter ignites the secondary premixed gas, which burns in the duty combustion chamber and acts as a stable flame root to ignite the mainstream premixed gas, forming a jet premixed flame and enhancing combustion.

[0007] Furthermore, the tail end of the igniter is connected to the base, and the tail end of the flame detector is also connected to the base. The base has mounting holes, and the distributor passes through and connects to the mounting holes. The base is used to fix and limit the igniter, flame detector, and distributor. The flame detector is used to detect whether the flame is in a burning state.

[0008] Furthermore, the on-duty flame combustion system includes a premixer and an intake pipe. One end of the premixer is connected to the airflow inlet, and the other end is connected to the intake pipe. Gas fuel and oxidant fuel enter the premixer through the intake pipe and mix to form a total premixed gas. By mixing the gas fuel and oxidant fuel through the premixer, combustion is achieved through pre-mixing, allowing for the design of appropriate fuel equivalence ratios based on different gas fuel components, thereby ensuring combustion stability.

[0009] Furthermore, the intake pipe consists of a concentrically arranged gas pipe and an air pipe, both of which are connected to the premixer. The air pipe and the premixer are detachably connected. The installation or removal of the air pipe can be selected according to the specific scenario.

[0010] Furthermore, the gas pipe is equipped with a pressure sensor to detect the pressure of the gas and reflect the injection speed of the mainstream premixed gas.

[0011] Furthermore, the distributor is a hollow cylinder with an inlet diameter of D1, a main flow orifice diameter of D2, a secondary flow orifice diameter of D3, and an opening diameter of D4, where 1 < D1 / D2 < 2, 6 < D1 / D3 < 10, and D4 / D1 > 1.25. These limitations ensure that the secondary premixed gas flow rate is < 50% of the total premixed gas, allowing only a small portion of the gas to form secondary premixed gas for combustion in the duty combustion chamber.

[0012] Furthermore, the secondary flow orifice is inclined upwards. This upward inclination reduces the direct high-speed collision of the secondary premixed gas flowing out of the orifice with the inner wall of the combustion chamber, thus reducing the formation of vortices. This is beneficial for flame stabilization and guides the secondary premixed gas upwards to the igniter for stable ignition.

[0013] Furthermore, a gas valve is provided at the lower end of the premixer. When the gas valve is open, the air intake pipe is connected to the premixer, and when the gas valve is closed, the air intake pipe is disconnected from the premixer.

[0014] Compared with existing technologies, the wide-range duty flame combustion system of this utility model has the following advantages:

[0015] (1) The total premixed gas enters the distributor, and most of it is ejected through the main flow orifice. A small portion is blocked by the shoulder and ejected through the secondary flow orifice located on the side wall of the distributor ring, thus achieving the diversion of the total premixed gas. The total premixed gas is diverted into the main flow premixed gas and the secondary flow premixed gas. A small amount of the secondary flow premixed gas burns in the duty combustion chamber and acts as a stable flame root to ignite the main flow premixed gas to form a jet premixed flame, thereby enhancing combustion.

[0016] (2) Controlling the injection speed of the mainstream premixed gas to 10-65 m / s enables the mainstream premixed gas to burn outside the opening end of the duty combustion chamber, avoiding unstable combustion that is prone to occur when the internal space of the duty combustion chamber is limited and factors such as pressure fluctuations change.

[0017] (3) The air intake pipe consists of a concentrically arranged gas pipe and an air pipe, both of which are connected to the premixer. The air pipe and the premixer are detachably connected. The installation or removal of the air pipe can be selected according to the specific scenario. Attached Figure Description

[0018] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0019] Figure 1 This is a top view of the duty combustion chamber, igniter, flame detector and diverter assembled together according to this utility model;

[0020] Figure 2 for Figure 1 Sectional view in the AA direction;

[0021] Figure 3 for Figure 1 Sectional view in the BB direction;

[0022] Figure 4 This is a schematic diagram of the structure of the duty combustion chamber and base described in this utility model;

[0023] Figure 5-1 This is a schematic diagram of the structure of the base, igniter, flame detector and diverter described in this utility model;

[0024] Figure 5-2 This is a schematic diagram of the structure of the shunt device described in this utility model;

[0025] Figure 6 for Figure 2 Another perspective sectional view;

[0026] Figure 7 This is a schematic diagram of the duty flame combustion system described in this utility model;

[0027] Figure 8 This is a pressure cloud diagram of methane as the fuel gas.

[0028] Figure 9 This is a combustion temperature contour map of methane as the fuel gas.

[0029] Figure 10 The injection velocity of the mainstream premixed gas at the corresponding pressure when methane is used as the fuel gas;

[0030] Figure 11 This is a pressure cloud map of a gas fueled by hydrogen.

[0031] Figure 12 This is a combustion temperature cloud map for hydrogen as the fuel gas;

[0032] Figure 13 The injection velocity of the mainstream premixed gas at the corresponding pressure when hydrogen is used as the fuel gas.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Combustion chamber; 11. Open end; 2. Igniter; 3. Flame detector; 4. Diverter; 41. Airflow inlet; 42. Airflow outlet; 421. Main flow orifice wall; 422. Diverter ring wall; 423. Shoulder; 43. Main flow orifice; 44. Secondary flow orifice; 5. Base; 51. Mounting hole; 6. Premixer; 7. Gas pipe; 8. Air pipe; 9. Burner. Detailed Implementation

[0035] The present invention will be further described below with reference to specific embodiments. First, it should be noted that the data in the following experimental examples were obtained by the inventors through numerous experiments. Due to space limitations, only a portion of these data is shown in the specification, and those skilled in the art can understand and implement the present invention based on this data. These embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the contents of this invention, those skilled in the art can make various modifications or alterations to the present invention, and these modifications or alterations also fall within the scope of protection of this application.

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0037] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] like Figures 1-6 As shown, a wide-range standby flame combustion system includes a standby combustion chamber 1, an igniter 2, a flame detector 3, a distributor 4, and a burner 9. The standby combustion chamber 1 provides an ignition flame to the burner 9 to maintain continuous combustion of the flame in the burner 9. The upper end of the standby combustion chamber 1 is an open end 11, and the lower end is equipped with a base 5. The igniter 2 and the flame detector 3 are located inside the standby combustion chamber 1. The distributor 4 is a hollow structure with openings at both ends, including a connected airflow inlet 41 and an air... The outlet section 42 is located inside the duty combustion chamber 1. The outlet section 42 includes a main flow hole wall 421 and a flow divider ring wall 422 that are connected. The main flow hole wall 421 extends towards the inside of the flow divider 4 at the connection between the main flow hole wall 421 and the flow divider ring wall 422 to form a shoulder 423. The outer periphery of the flow divider ring wall 422 is provided with a secondary flow hole 44. The main flow hole 43 is formed inside the main flow hole wall 421.

[0039] A flow divider 4 forms a main flow orifice 43 and a secondary flow orifice 44. The total premixed gas enters the flow divider 4, with most of it exiting through the main flow orifice 43. A small portion, blocked by the shoulder 423, exits through the secondary flow orifice 44 located on the side wall of the flow divider ring wall 422, thus achieving the diversion of the total premixed gas. The igniter 2 ignites the secondary flow premixed gas, which burns in the duty combustion chamber 1 and acts as a stable flame root, igniting the main flow premixed gas to form a jet premixed flame, enhancing combustion. The flow divider 4 of this application has a simple structure, and the total premixed gas can be graded using only the flow divider 4.

[0040] Specifically, the outer periphery of the diversion ring wall 422 is provided with multiple secondary flow holes 44, so that the secondary flow premixed gas is dispersed in the duty combustion chamber 1, making it easier for the igniter 2 to ignite the secondary flow premixed gas.

[0041] As a preferred example of this application, the airflow outlet 42 is provided with a main flow hole 43 and a secondary flow hole 44, and the area of ​​the secondary flow hole 44 is smaller than the area of ​​the main flow hole 43. The secondary flow premixed gas is less than 50% of the total premixed gas, and the injection velocity of the main flow premixed gas is 10 to 65 m / s.

[0042] In the wide-range shift flame combustion system of this application, the total premixed gas is split into a main premixed gas and a secondary premixed gas by a distributor 4. The igniter 2 ignites the secondary premixed gas, which burns in the shift combustion chamber 1 and acts as a stable flame root, igniting the main premixed gas to form a jet premixed flame, thus enhancing combustion. Because the injection velocity of the main premixed gas can reach 10–65 m / s, it can burn outside the opening 11 of the shift combustion chamber 1. In traditional shift flame combustion systems, all the total premixed gas burns in the shift combustion chamber 1. Due to the limited internal space of the shift combustion chamber 1, unstable combustion is prone to occur when factors such as pressure fluctuations change. This application utilizes a secondary premixed gas (<50% total premixed gas) to burn and ignite the mainstream premixed gas inside the standby combustion chamber 1. Simultaneously, the mainstream premixed gas forms a jet that burns outside the opening end 11. This allows for greater capacity to cope with changes in gas pressure (10–300 kPa), burner internal pressure, fuel composition, altitude, and ambient humidity, thereby avoiding impacts on the standby flame itself. The standby flame combustion system of this application has a wide range of applications, greatly enhancing market adaptability.

[0043] Furthermore, at one atmosphere and 25°C, the laminar combustion velocity of methane or hydrogen is <5 m / s, meaning the maximum flashback velocity for low-carbon, high-hydrogen fuels is <5 m / s. For details, please refer to Liu Haiqing, Zhang Linyao, Xing Chang, Liu Li, Qiu Penghua. Hydrogen fuel characteristics and hydrogen micro-mixing flame mode analysis [J / OL]. Proceedings of the CSEE. https: / / doi.org / 10.13334 / j.0258-8013.pcsee.232125, and Hu Erjiang, Huang Zuohua, Jiang Xue, et al. Study on premixed laminar combustion and ignition characteristics of C1-C4 alkanes [J]. Journal of Engineering Thermophysics, 2013, 34(03):558-562.

[0044] Therefore, the injection velocity of the mainstream premixed gas (10-65 m / s) proposed in this invention is greater than the maximum flashback velocity of the standby flame. The continuous and stable combustion of the secondary premixed gas enhances the combustion of the mainstream premixed gas while ensuring no flameout. Furthermore, the high-speed mainstream premixed gas enhances entrainment, which in turn improves the stability of the standby flame.

[0045] The splitter 4 of this application has a simple structure and is easy to manufacture. It will not cause the secondary premixed gas to fail to stably ignite the mainstream premixed gas due to different installation methods or changes in position of the splitter 4.

[0046] The tail end of the igniter 2 is connected to the base 5, and the tail end of the flame detector 3 is also connected to the base 5. The base 5 has a mounting hole 51, through which the distributor 4 passes and connects. The base 5 is used to fix and limit the igniter 2, the flame detector 3, and the distributor 4. The flame detector 3 is used to detect whether the flame is in a burning state. Specifically, the flame detector 3 is selected from at least one of a flame ionization detection device and an electrical flame detection device.

[0047] like Figure 7 As shown, the on-duty flame combustion system includes a premixer 6 and an intake pipe. One end of the premixer 6 is connected to the airflow inlet 41, and the other end is connected to the intake pipe. Combustion gas and oxidizing gas enter the premixer 6 through the intake pipe and mix to form a total premixed gas. Then, it is split by a distributor 4 to form a main premixed gas and a secondary premixed gas. By mixing the combustion gas and oxidizing gas through the premixer 6, a mixture before combustion is achieved, allowing for the design of a suitable fuel equivalence ratio based on the different gas components, thereby ensuring combustion stability. Specifically, the combustion equivalence ratio is 0.6 to 1.4. Existing technologies, such as CN113237095A, employ a simultaneous mixing and combustion method, which results in a highly uncertain combustion equivalence ratio, implying uncertainty and instability in combustion.

[0048] The air intake duct consists of a concentrically arranged gas pipe 7 and air pipe 8, both of which are connected to the premixer 6. The air pipe 8 and the premixer 6 are detachably connected. The installation or removal of the air pipe 8 can be selected according to the specific scenario. Specifically, for example... Figure 7 As shown on the left, the intake pipe includes a gas pipe 7 and an air pipe 8. The gas pipe 7 is concentrically sleeved inside the air pipe 8. One end of the gas pipe 7 is connected to the premixer 6, and the other end is connected to the gas source. One end of the air pipe 8 is connected to the premixer 6, and the other end is connected to the air source. This ensures that the combustion gas entering the duty combustion chamber 1 is room temperature air, minimizing the probability of backfire. Figure 7 As shown on the right, the air intake pipe includes a gas pipe 7 and an air pipe 8, which are detached. One end of the gas pipe 7 is connected to the premixer 6, and the other end is connected to the gas source. The premixer 6 is internally connected to the burner 9, ensuring that the combustion gas entering the duty combustion chamber 1 is a combustion gas with a certain amount of heat from inside the burner 9. This reduces the impact of pressure fluctuations, thallium height, and ambient humidity within the burner 9 on the duty flame itself. The form of the air intake pipe can be selected according to specific needs, greatly enhancing the environmental adaptability of this utility model's duty flame combustion system and improving its versatility.

[0049] Furthermore, a gas valve is provided at the lower end of the premixer 6. When the gas valve is open, the air intake pipe is connected to the premixer 6, and when the gas valve is closed, the air intake pipe is disconnected from the premixer 6.

[0050] The injection velocity of the mainstream premixed gas can be reflected by the gas pressure. Specifically, a pressure sensor is installed in the gas pipe 7 to detect the gas pressure and reflect the injection velocity of the mainstream premixed gas, so as to reasonably adjust the gas intake pressure. When the pressure in the gas pipe 7 reaches 10-300 kPa, the injection velocity of the mainstream premixed gas can reach 10-65 m / s. Specifically, the injection velocity of the mainstream premixed gas is determined based on the gas pressure cloud map and the injection velocity map of the mainstream premixed gas. In this application... Figures 8-10 The diagrams show the gas pressure cloud map, combustion temperature cloud map, and injection velocity of the mainstream premixed gas at the corresponding pressures for methane as the fuel gas. When the pressure is 10–300 kPa, according to… Figure 9 Combustion occurred, according to Figure 10 The injection velocity of the mainstream premixed gas reaches 10–50 m / s. In this application… Figures 11-13 The diagrams show the gas pressure cloud map, combustion temperature cloud map, and injection velocity of the mainstream premixed gas at the corresponding pressures when hydrogen is used as the fuel gas. When the pressure is 10–300 kPa, according to… Figure 12 Combustion occurred, according to Figure 13 The injection velocity of the mainstream premixed gas reaches 10-55 m / s.

[0051] In a preferred embodiment of the present invention, the airflow outlet 42 includes a main flow hole wall 421 and a diversion ring wall 422 that are connected. The main flow hole wall 421 extends at the connection between the main flow hole wall 421 and the diversion ring wall 422 in a direction away from the secondary flow hole 44 to form a shoulder 423. The diversion ring wall 422 is provided with a secondary flow hole 44 on its outer periphery, and the main flow hole 43 is formed inside the main flow hole wall 421.

[0052] Furthermore, the distributor 4 is a hollow cylinder with a diameter of D1 for the airflow inlet 41, a diameter of D2 for the main flow orifice 43, a diameter of D3 for the secondary flow orifice 44, and a diameter of D4 for the opening end 11. The ratios are: 1 < D1 / D2 < 2, 6 < D1 / D3 < 10, and D4 / D1 > 1.25. These limitations further ensure that the secondary premixed gas flow rate is < 50% of the total premixed gas, so that only a small portion of the gas forms the secondary premixed gas and burns in the duty combustion chamber 1.

[0053] Furthermore, the secondary flow orifice 44 is inclined upwards. Compared to a straight orifice, the inclined arrangement reduces the direct high-speed collision of the secondary premixed gas flowing out of the secondary flow orifice 44 with the inner wall of the combustion chamber 1, thus reducing the formation of vortices and promoting flame stabilization. The inclined upward arrangement of the secondary flow orifice 44 also guides the secondary premixed gas upwards to the igniter 2 for stable ignition.

[0054] The duty flame combustion system also includes a signal processing module, which is connected to the igniter 2 and the flame detector 3 respectively. The signal processing module is used to receive and feedback signals from the igniter 2 and the flame detector 3, and to process relevant data of the combustion control method of the duty flame combustion system.

[0055] The combustion control method for the aforementioned wide-range on-call flame combustion system includes the following steps:

[0056] S1. Ignition is initiated by igniter 2;

[0057] S2. Open the gas valve and adjust the gas inlet pressure to 10-300 kPa.

[0058] S3. Gas enters the premixer 6 through gas pipe 7, and air enters the premixer 6 through air pipe 8; or, gas enters the premixer 6 through gas pipe 7, and combustion-supporting gas inside the burner 9 enters the premixer 6.

[0059] S4. The total premixed gas in the premixer 6 is split into a main premixed gas and a secondary premixed gas by the splitter 4. The main premixed gas is ejected from the main orifice 43, and the secondary premixed gas is ejected from the secondary orifice 44.

[0060] S5. Igniter 2 ignites the secondary premixed gas, which is stably ignited in the duty combustion chamber 1 and ignites the mainstream premixed gas. The high-speed mainstream premixed gas forms a jet flame that burns outside the opening end 11.

[0061] S6. Ignition device 2 sends a feedback signal to signal processing module to start flame detection device 3;

[0062] S7. The flame detection device 3 determines whether a flame signal is detected in the duty combustion chamber 1. If yes, it determines that the duty combustion chamber 1 has an ignition flame; if no, it proceeds to step S8.

[0063] S8. Ignition device 2 ignites again, records the number of ignitions n, and determines whether the number of ignitions n is ≥2. If yes, proceed to step S9; otherwise, return to step S7.

[0064] S9. Gas valve closed.

[0065] Specifically, when using the flame detector 3 to detect the flame signal of the duty combustion chamber 1, if a flame is detected, it indicates that the duty combustion chamber 1 has an ignition flame. If no flame is detected, the igniter 2 is activated again to ignite the flame, to avoid the possibility that the lack of ignition is due to a problem with the igniter 2. If the flame signal cannot be detected after three or more ignition attempts, it indicates that the duty combustion chamber 1 may be faulty. The gas valve should be closed to cut off the intake of gas and auxiliary gas to prevent damage to the duty flame combustion system. Since the use of the flame detector 3 to detect the flame signal of the duty combustion chamber 1 is existing technology, it will not be described in detail here.

[0066] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A wide-range duty flame combustion system, characterized in that, The system includes a duty combustion chamber (1), an igniter (2), a flame detector (3), a distributor (4), and a burner (9). The upper end of the duty combustion chamber (1) is an open end (11), and the lower end is equipped with a base (5). The igniter (2) and the flame detector (3) are located inside the duty combustion chamber (1). The distributor (4) is a hollow structure with open ends, including a connected airflow inlet (41) and an airflow outlet (42). The airflow inlet (41) extends out of the base (5). The airflow outlet (42) is located inside the duty combustion chamber (1). The airflow outlet (42) includes a main flow hole wall (421) and a flow divider ring wall (422) that are connected. The main flow hole wall (421) extends towards the inside of the flow divider (4) at the connection between the main flow hole wall (421) and the flow divider ring wall (422) to form a shoulder (423). The outer periphery of the flow divider ring wall (422) is provided with a secondary flow hole (44). The main flow hole (43) is formed inside the main flow hole wall (421).

2. The wide-range duty flame combustion system according to claim 1, characterized in that, The tail end of the igniter (2) is connected to the base (5), the tail end of the flame detector (3) is connected to the base (5), the base (5) is provided with a mounting hole (51), and the distributor (4) passes through the mounting hole (51) and is connected to the mounting hole (51).

3. The wide-range duty flame combustion system according to claim 1, characterized in that, The duty flame combustion system includes a premixer (6) and an air intake pipe. One end of the premixer (6) is connected to the air inlet (41), and the other end is connected to the air intake pipe. The fuel gas and the auxiliary fuel gas enter the premixer (6) through the air intake pipe and mix to form a total premixed gas.

4. The wide-range duty flame combustion system according to claim 3, characterized in that, The air intake pipe consists of a gas pipe (7) and an air pipe (8) that are concentrically arranged. Both the gas pipe (7) and the air pipe (8) are connected to the premixer (6). The air pipe (8) and the premixer (6) are detachably connected.

5. The wide-range duty flame combustion system according to claim 4, characterized in that, The gas pipe (7) is equipped with a pressure sensor to detect the pressure of the gas and reflect the injection speed of the mainstream premixed gas.

6. The wide-range duty flame combustion system according to claim 1, characterized in that, The splitter (4) is a hollow cylinder with a diameter of D1 for the airflow inlet (41), a diameter of D2 for the main flow orifice (43), a diameter of D3 for the secondary flow orifice (44), and a diameter of D4 for the opening end (11). 1 < D1 / D2 < 2, 6 < D1 / D3 < 10, and D4 / D1 > 1.

25.

7. The wide-range duty flame combustion system according to claim 1, characterized in that, The secondary flow hole (44) is inclined upward.

8. The wide-range duty flame combustion system according to claim 3, characterized in that, A gas valve is provided at the lower end of the premixer (6). When the gas valve is open, the gas inlet pipe and the premixer (6) are connected. When the gas valve is closed, the gas inlet pipe and the premixer (6) are disconnected.

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