Burner for low calorific value waste gas fuel

Abstract

The present invention relates to the technical field of waste gas combustion equipment, and in particular to a burner for low calorific value waste gas fuel, including a combustion chamber, a swirler, and a fuel pipe and an air pipe connected to the combustion chamber. The swirler is arranged in the fuel pipe to cause the waste gas fuel flowing in the fuel pipe to form a swirl and then enter the combustion chamber to form a recirculation zone and mix with the air ejected from the air pipe. The burner for low calorific value waste gas fuel of the present invention can achieve a combustion environment suitable for low calorific value waste gas fuel, ensure that the air flow in the combustion environment is much smaller than the flow rate of the low calorific value waste gas fuel, and ensure the stable combustion of the low calorific value waste gas fuel even without adding a combustion improver.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas combustion equipment, and in particular to a burner for low calorific value waste gas fuel. Background Art

[0002] In the prior art, some waste gases generated industrially need to be burned to remove harmful pollutants before being discharged, or recycled after burning to remove harmful pollutants. The combustion of waste gas generally passes through a burner. During the combustion process, while inputting waste gas into the combustion chamber, an oxidant (air) is input at the same time, so that the waste gas and the oxidant (air) are continuously mixed with each other, enabling the waste gas to burn continuously. However, the above-mentioned industrial waste gases can be roughly divided into high calorific value waste gases and low calorific value waste gases. High calorific value waste gases have stable flames and are easy to burn during the combustion process, and most burners in the prior art can effectively handle them. In contrast, low calorific value waste gases have extremely unstable flames and are difficult to stabilize the flame. Traditional burners are difficult to efficiently burn them. Therefore, in some cases, people choose to directly discharge low calorific value waste gases, resulting in huge energy waste. For example, the waste gas generated by a fuel cell contains a small amount of combustible components such as methane and hydrogen, and has a relatively high temperature and humidity. It can be reused after combustion. Especially in a distributed power generation system, the high-temperature waste gas generated by the fuel cell is further burned, and after removing the pollutants in the waste gas, the waste heat generated during combustion can preheat the intake air of the fuel cell, which can effectively improve the efficiency of the distributed power generation system. It should be noted that since the high-temperature waste gas generated by the fuel cell is a low calorific value waste gas and contains only a very small amount of combustible components, during the combustion process, too much air (oxidant) cannot be input, and only a small amount of air (oxidant) needs to be provided to ensure the feasibility of ignition and the stable combustion of the flame. Therefore, during the process of burning low calorific value waste gas fuel, the flow rate of the waste gas is much greater than the flow rate of air (oxidant).

[0003] The prior art also provides various solutions for the combustion of low calorific value waste gas fuel. For example, the authorized patent with the patent number 201921410963.3 discloses a new type of low calorific value burner, such as Figure 1 、 2As shown, the low calorific value burner of this solution includes a housing 1 and a nozzle formed by connecting a first combustion tube 8 and a second combustion tube 11 through threads. Among them, combustion holes 9 are provided on the surface of the first combustion tube 8; a through hole 13 is provided at the left end of the second combustion tube 11 for flowing the air provided by a fan 14; a gas delivery device A and a feeding door 24 are also provided on the second combustion tube 11. Combustion method: The gas delivery device A controls the flow rate of the gas. The gas enters the first combustion tube 8 and the second combustion tube 11. Then, the heating switch 6 is turned on, and the heating resistance wire 5 starts to work to preheat the gas. After a period of preheating, ignition is carried out through an arc igniter 7. After ignition, the fan 14 is started to deliver air into the first combustion tube 8 and the second combustion tube 11. If a combustion improver needs to be added, the feeding door 24 can be opened to add the combustion improver into the interior.

[0004] Combined with Figure 1 、 Figure 2 , fuel and air are introduced into the first combustion tube 8 and the second combustion tube 11 for mixed combustion. However, there is no physical structure or pneumatic structure designed for stabilizing the flame in this invention. The stable position of the flame is greatly affected by the flow rate of the mixture, and the flame stability is poor; there is no design for enhancing the mixing effect of fuel and air in this invention. Usually, a combustion improver needs to be added for combustion assistance, and the residue needs to be cleaned after combustion, which is rather time-consuming.

[0005] Another example is that the authorized patent with the patent number CN200610011661.X discloses a low calorific value combustion chamber nozzle structure and combustion method for a gas turbine. As Figure 3 shown, the low calorific value burner of this solution includes a housing A and a nozzle B. Among them, the structure of the nozzle B includes a radial swirler 1, a swirler passage 4, a first row of fuel holes 3, and a second row of fuel holes 6. Combustion method: The primary air 5 flowing through the radial swirler 1 enters the swirler passage 4. The first row of exhaust gas fuel jets 2 enters the swirler passage 4 through the first row of fuel holes 3 to form a rich premixed gas with the primary air 5; the second row of exhaust gas fuel jets 7 enters the housing A through the second row of fuel holes 6 for combustion.

[0006] Combined with Figure 3, in this solution, the primary air 5 flowing through the radial swirler 1 is mixed and combusted with the first row of exhaust gas fuel jets 2 and the second row of exhaust gas fuel jets 7. In this invention, the flow channels of the first row of fuel holes 3 and the second row of fuel holes 6 are interconnected. When the burner operates at low load, only the second row of fuel holes 6 is in a flowing state; when the burner operates at high load, both the first row of fuel holes 3 and the second row of fuel holes 6 are in a flowing state; therefore, the nozzle fuel holes need to be designed with an opening and closing structure, which makes the structure more complex, the cost higher, and the reliability poorer; in addition, the first row of exhaust gas fuel jets 2 and the primary air 5 form a rich premixed gas in the swirler passage 4, which is prone to flashback, causing the combustion to occur in the swirler passage 4 and damaging the nozzle structure. More importantly, when the calorific value of the exhaust gas fuel is extremely low (such as the exhaust gas after fuel cell reaction), and the required air flow rate for combustion is much smaller than the flow rate of the exhaust gas fuel, it is difficult for the primary air 5 flowing through the radial swirler 1, the first row of exhaust gas fuel jets 2, and the second row of exhaust gas fuel jets 7 to have a sufficiently large swirl number, resulting in poor flame stability.

[0007] Generally speaking, in traditional prior art burners, the way of organizing combustion is often to let air (oxidant) flow through a swirler, making the air form a swirl and constituting a recirculation zone in the combustion chamber. In order to make the air (oxidant) have a sufficient swirl intensity after flowing through the swirler, it is often necessary to increase the air flow rate, resulting in a relatively high proportion of air (oxidant) in the combustion chamber. While the exhaust gas fuel is directly injected into the combustion chamber in a normal jetting manner to form a jet, resulting in a relatively low proportion of combustibles (exhaust gas fuel) in the combustion chamber. Burning low-calorific-value exhaust gas fuel in this combustion mode will cause unstable flames and difficult smooth combustion. To solve this problem, the prior art has to additionally add a combustion improver into the combustion chamber, which will eventually result in residues after combustion and require cleaning the combustion chamber every time, being time-consuming, laborious, and inefficient. Summary of the Invention

[0008] The present invention provides a burner for low-calorific-value exhaust gas fuel, which can achieve a combustion environment suitable for low-calorific-value exhaust gas fuel, ensuring that the air flow rate in the combustion environment is much smaller than the flow rate of the low-calorific-value exhaust gas fuel, and ensuring the stable combustion of the low-calorific-value exhaust gas fuel even without adding a combustion improver.

[0009] The present invention provides a burner for low-calorific-value exhaust gas fuel, including a combustion chamber, a swirler, as well as a fuel pipe and an air pipe connected to the combustion chamber. It is characterized in that the swirler is arranged in the fuel pipe to cause the exhaust gas fuel flowing in the fuel pipe to form a swirl and then enter the combustion chamber to constitute a recirculation zone and mix with the air ejected from the air pipe.

[0010] A burner for low calorific value waste gas fuel provided by the present invention, wherein the air pipe sleeve is inserted into the fuel pipe and an annular channel is formed between the air pipe sleeve and the fuel pipe. The swirler is arranged around the annular channel. The air pipe is provided with a plurality of circumferentially distributed injection holes, and the air pipe is connected to the annular channel through each injection hole.

[0011] A burner for low calorific value waste gas fuel provided by the present invention, each of the injection holes is close to the combustion chamber.

[0012] A burner for low calorific value waste gas fuel provided by the present invention further includes an auxiliary fuel pipe and an air flow channel connected to the combustion chamber. The auxiliary fuel pipe is sleeved on the outer periphery of the fuel pipe and an annular auxiliary channel is formed between the auxiliary fuel pipe and the fuel pipe. An auxiliary swirler is arranged around in the annular auxiliary channel, and the annular auxiliary channel is connected to the air flow channel through a plurality of circumferentially distributed auxiliary injection holes.

[0013] A burner for low calorific value waste gas fuel provided by the present invention, the auxiliary injection holes are close to the injection outlet of the auxiliary fuel pipe.

[0014] A burner for low calorific value waste gas fuel provided by the present invention, a plurality of the auxiliary injection holes are arranged in several columns along the length direction of the annular auxiliary channel and are circumferentially distributed between the annular auxiliary channel and the air flow channel.

[0015] A burner for low calorific value waste gas fuel provided by the present invention, the air flow channel is an annular channel integrally formed in the wall of the auxiliary fuel pipe, and a plurality of the auxiliary injection holes are integrally formed in the wall of the auxiliary fuel pipe.

[0016] A burner for low calorific value waste gas fuel provided by the present invention, the fuel pipe is divided into a front section fuel pipe and a rear section fuel pipe. One end of the rear section fuel pipe is connected to the combustion chamber, and the other end is threadedly connected to the front section fuel pipe. The air pipe is divided into a front section air pipe and a rear section air pipe. One end of the rear section air pipe is close to the injection outlet of the fuel pipe, and the other end is threadedly connected to the front section air pipe. A plurality of the injection holes are circumferentially distributed on the wall of the rear section air pipe close to the combustion chamber.

[0017] A burner for low calorific value waste gas fuel provided by the present invention, a plurality of the injection holes are arranged in several columns along the length direction of the rear section air pipe and are circumferentially distributed on the rear section air pipe.

[0018] A burner for low calorific value waste gas fuel provided by the present invention, each of the circumferentially distributed injection holes is arranged in an alternating pattern of large and small holes.

[0019] A burner for low - calorific - value waste gas fuel provided by the present invention, when it is necessary to burn low - calorific - value waste gas fuel, a low - calorific - value waste gas fuel jet with a sufficient flow rate is input into the fuel pipe. The low - calorific - value waste gas fuel jet forms a swirl after passing through the swirler. After the low - calorific - value waste gas fuel with swirl enters the combustion chamber, a recirculation zone will be formed in the combustion chamber (the function of forming the recirculation zone is to make the combustion products flow back from downstream to upstream to form a stable ignition source). On the other hand, air as an oxidant enters the combustion chamber in the form of a normal jet through the air pipe and mixes with a large amount of swirling and diffusing low - calorific - value waste gas fuel. In order to ensure that the low - calorific - value waste gas fuel has sufficient swirl intensity after passing through the swirler, the flow rate of the low - calorific - value waste gas fuel is greatly increased during input. Therefore, the content of the low - calorific - value waste gas fuel entering the combustion chamber to participate in mixing is much greater than the content of air (oxidant) in the combustion chamber, ensuring that the air flow rate in the combustion environment is much smaller than the flow rate of the low - calorific - value waste gas fuel. That is to say, in the solution of the present invention, the flow positions of air and waste gas fuel in the prior art are replaced. The low - calorific - value waste gas fuel generates swirl, while air (oxidant) is output in the form of a normal jet and mixes into the swirl of the waste gas fuel to form a combustible mixture with a low air content. Therefore, when this low - calorific - value combustible mixture is ignited, the generated flame is stable and can maintain stable combustion without adding a combustion improver, which is suitable for treating low - calorific - value waste gas fuel. Therefore, a burner for low - calorific - value waste gas fuel of the present invention can achieve a combustion environment suitable for low - calorific - value waste gas fuel, ensure that the air flow rate in the combustion environment is much smaller than the flow rate of the low - calorific - value waste gas fuel, and can ensure the stable combustion of the low - calorific - value waste gas fuel even without adding a combustion improver. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following - described drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 is a schematic structural diagram of a prior - art burner;

[0022] Figure 2 is a schematic structural diagram of a prior - art burner;

[0023] Figure 3 is a schematic structural diagram of a prior - art burner;

[0024] Figure 4 is a plan view of the internal structure of the present invention;

[0025] Figure 5 is a three - dimensional view of the internal structure of the present invention;

[0026] Figure 6 is the plan view of the internal structure of the present invention;

[0027] Figure 7 is the three-dimensional view of the internal structure of the present invention;

[0028] Figure 8 is the partial structure diagram of the present invention;

[0029] Figure 9 is the sectional view of the partial structure of the present invention;

[0030] Figure 10 is the plan view of the internal structure of the present invention;

[0031] Figure 11 is the three-dimensional view of the internal structure of the present invention;

[0032] Figure 12 is the plan view of the internal structure of the present invention;

[0033] Figure 13 is the partial structure diagram of the present invention;

[0034] Figure 14 is the partial structure diagram of the present invention;

[0035] Figure 15 is the partial structure diagram of the second embodiment of the present invention.

[0036] Reference numerals:

[0037] 1 Combustion chamber, 2 Swirler, 3 Fuel pipe, 4 Air pipe, 5 Annular channel, 6 Injection hole, 7 Auxiliary fuel pipe, 8 Air flow channel, 9 Annular auxiliary channel, 10 Auxiliary swirler, 11 Auxiliary injection hole, 31 Front-section fuel pipe, 32 Rear-section fuel pipe, 41 Front-section air pipe, 42 Rear-section air pipe. Detailed implementation manners

[0038] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts fall within the scope of protection of the present invention.

[0039] Embodiment 1

[0040] The following combines Figure 4 and Figure 5A burner for low calorific value waste gas fuel of the present invention is described, which includes a combustion chamber 1, a swirler 2, and a fuel pipe 3 and an air pipe 4 connected to the combustion chamber 1. Before burning the waste gas, the waste gas fuel can be input into the combustion chamber 1 through the fuel pipe 3, and at the same time, air (oxidant) can be input into the combustion chamber 1 through the air pipe 4. In addition, the swirler 2 is installed in the fuel pipe 3. The waste gas fuel flowing in the fuel pipe 3 will form a swirl after passing through the swirler 2. The waste gas fuel after forming the swirl enters the combustion chamber 1 and diffuses, and is fully mixed with the air (oxidant) ejected from the air pipe 4 to form a combustible mixture. When the ignition device (not shown in the figure) in the combustion chamber 1 is turned on, the mixture can be ignited and burned.

[0041] When it is necessary to burn low calorific value waste gas fuel, by inputting a jet of low calorific value waste gas fuel with a sufficient flow rate into the fuel pipe 3, the jet of low calorific value waste gas fuel forms a swirl after passing through the swirler 2. After the low calorific value waste gas fuel forms a swirl and enters the combustion chamber 1, a recirculation zone will be formed in the combustion chamber 1 (the function of forming the recirculation zone is to make the combustion products flow back from downstream to upstream to form a stable ignition source). On the other hand, the air as the oxidant enters the combustion chamber 1 in the form of a normal jet through the air pipe 4 and is mixed with a large amount of swirling and diffusing low calorific value waste gas fuel. In order to ensure that the low calorific value waste gas fuel has sufficient swirl intensity after passing through the swirler 2, the flow rate of the low calorific value waste gas fuel will be greatly increased during input. Therefore, the content of the low calorific value waste gas fuel entering the combustion chamber 1 to participate in the mixing will be much greater than the content of the air (oxidant) in the combustion chamber 1, ensuring that the air flow rate in the combustion environment is much smaller than the flow rate of the low calorific value waste gas fuel. That is to say, in the solution of the present invention, the flow positions of air and waste gas fuel in the prior art are replaced, so that the low calorific value waste gas fuel generates a swirl, while the air (oxidant) is output in the form of a normal jet and is mixed into the swirl of the waste gas fuel to form a combustible mixture with a low air content. Therefore, when this low calorific value combustible mixture is ignited, the generated flame is stable and can maintain stable combustion without adding a combustion improver, which is suitable for treating low calorific value waste gas fuel. Therefore, a burner for low calorific value waste gas fuel of the present invention can achieve a combustion environment suitable for low calorific value waste gas fuel, ensure that the air flow rate in the combustion environment is much smaller than the flow rate of the low calorific value waste gas fuel, and ensure the stable combustion of the low calorific value waste gas fuel even without adding a combustion improver.

[0042] Further, as Figures 6 - 9As shown, the air pipe 4 is inserted into the fuel pipe 3 in a nested manner and forms an annular channel 5 with the fuel pipe 3. The swirler 2 is annular and surrounds the annular channel 5. The air pipe 4 is provided with a plurality of circumferentially distributed injection holes 6, and the air pipe 4 is connected to the annular channel 5 through each injection hole 6. During use, the waste gas fuel input from the fuel pipe 3 will enter the combustion chamber 1 through the annular channel 5, and will flow through the annular swirler 2 during this process and form a swirl. Since the air pipe 4 is inserted into the fuel pipe 3 in a nested manner, in this embodiment, the air pipe 4 is inserted into the inner center of the fuel pipe 3. At the same time, since the air pipe 4 is provided with a plurality of circumferentially distributed injection holes 6, the air jets input from the air pipe 4 will be simultaneously ejected in all directions in the annular channel 5 through each circumferentially distributed injection hole 6. The air jets can be mixed with the swirl of the waste gas fuel from multiple directions, so that the waste gas fuel and air can be more evenly mixed. After mixing, it enters the combustion chamber 1 to form a diffused combustible mixture A, and the mixing effect is better, enabling the mixture after mixing to burn more fully, the flame to be more stable, and the combustion efficiency to be higher.

[0043] Further, as Figures 6 - 8 shown, each injection hole 6 is close to the combustion chamber 1, making each injection hole 6 closer to the outlet of the fuel pipe 3, so that the combustible mixture after mixing can quickly leave the fuel pipe 3 and enter the combustion chamber 1 for diffusion, avoiding the risk of flashback, with stronger reliability, and ensuring the continuous and stable internal combustion.

[0044] In order to further increase the combustion amount of the burner and enable the burner to perform combustion work at a higher load, as Figures 10 - 11 shown, in this embodiment, the burner is further provided with an auxiliary fuel pipe 7 and an air flow passage 8. The auxiliary fuel pipe 7 and the air flow passage 8 are both connected to the combustion chamber 1. At the same time, the auxiliary fuel pipe 7 is sleeved on the outer periphery of the fuel pipe 3 and forms an annular auxiliary channel 9 with the fuel pipe 3. An annular auxiliary swirler 10 is disposed around the annular auxiliary channel 9. The annular auxiliary channel 9 is connected to the air flow passage 8 through a plurality of circumferentially distributed auxiliary injection holes 11. The air jets input from the air flow passage 8 will be simultaneously ejected in all directions in the annular auxiliary channel 9 through each circumferentially distributed auxiliary injection hole 11. The air jets can be mixed with the swirl of the waste gas fuel in the annular auxiliary channel 9 from multiple directions, so that the waste gas fuel and air can be more evenly mixed. After mixing, it enters the combustion chamber 1 to form a partially premixed combustible mixture B, and the mixing effect is better, enabling the mixture after mixing to burn more fully, the flame to be more stable, and the combustion efficiency to be higher.

[0045] When the burner is operating in a low-load combustion mode, that is, when the amount of waste gas to be burned is relatively small, only waste gas fuel and air need to be input through the fuel pipe 3 and the air pipe 4 respectively; while when a large amount of waste gas needs to be burned, the burner needs to operate in a high-load combustion mode. After adding the auxiliary fuel pipe 7 and the air flow channel 8, they can cooperate with the fuel pipe 3 and the air pipe 4 to jointly supply gas. The low-calorie waste gas fuel enters the combustion chamber 1 through both the fuel pipe 3 and the auxiliary fuel pipe 7 at the same time. And in the auxiliary fuel pipe 7, after the waste gas fuel flows through the auxiliary swirler 10, it will also form a swirl and enter the combustion chamber 1 to form a recirculation zone. At the same time, air (oxidant) can also pass through the air pipe 4 and the air flow channel 8, and are respectively ejected in multiple directions through the injection holes 6 and the auxiliary injection holes 11. After being fully mixed with the waste gas fuel respectively, they enter the combustion chamber 1 to diffuse, and diffusible combustible mixtures A and partially premixed combustible mixtures B are respectively formed in the combustion chamber 1. Thus, the waste gas treatment capacity of the burner can be significantly improved, making the burner suitable for higher-load combustion work. In addition, it should be noted that since the fuel pipe 3 is sleeved on the air pipe 4 and the auxiliary fuel pipe 7 is sleeved on the fuel pipe 3, the fuel pipe 3, the air pipe 4, the auxiliary fuel pipe 7 and the air flow channel 8 can be independent of each other, and their respective flow rates can also be controlled separately, which is beneficial to improving the air flow regulation accuracy of the burner.

[0046] Furthermore, the auxiliary injection holes 11 are close to the injection outlet of the auxiliary fuel pipe 7, so that the combustible gas mixture after mixing can quickly leave the auxiliary fuel pipe 7 and enter the combustion chamber 1 to diffuse, avoiding the risk of flashback, with stronger reliability and ensuring the continuous and stable internal combustion.

[0047] Specifically, the auxiliary injection holes 11 are arranged in several columns along the length direction of the annular auxiliary channel 9 and are circumferentially distributed between the annular auxiliary channel 9 and the air flow channel 8. That is to say, the circumferentially distributed auxiliary injection holes 11 are arranged in multiple columns, which can make the waste gas fuel in the annular auxiliary channel 9 and the air in the air flow channel 8 have a longer mixing distance, so that the mixing is more uniform, the mixture after mixing can burn more fully, the flame is more stable, and the combustion efficiency is higher.

[0048] Specifically, as Figure 10 and Figure 11 shown, the air flow channel 8 is an annular channel integrally formed in the wall of the auxiliary fuel pipe 7, and the multiple auxiliary injection holes 11 are integrally formed in the wall of the auxiliary fuel pipe 7. Therefore, the air flow channel 8, the auxiliary fuel pipe 7, and the auxiliary injection holes 11 can be integrally manufactured, which can reduce the production cost, reduce the requirement for installation accuracy, and simplify the installation of the burner.

[0049] More specifically, as Figure 12As shown, the fuel pipe 3 is divided into a front-section fuel pipe 31 and a rear-section fuel pipe 32. One end of the rear-section fuel pipe 32 is connected to the combustion chamber 1, and the other end is threadedly connected to the front-section fuel pipe 31; the air pipe 4 is divided into a front-section air pipe 41 and a rear-section air pipe 42. One end of the rear-section air pipe 42 is close to the injection outlet of the fuel pipe 3, and the other end is threadedly connected to the front-section air pipe 41. A number of injection holes 6 are circumferentially distributed on the wall of the rear-section air pipe 42 close to the combustion chamber 1. Through the above structure, the extension of the fuel pipe 3 and the air pipe 4 can be realized according to actual needs, and the assembly is more compact.

[0050] Optionally, as Figure 13 shown, each of the injection holes 6 is arranged in several columns along the length direction of the rear-section air pipe 42 and is circumferentially distributed on the rear-section air pipe 42. That is to say, the circumferentially distributed injection holes 6 are arranged in multiple columns, which can allow the waste gas fuel in the annular channel 5 and the air in the air pipe 4 to have a longer mixing distance, so that the mixing is more uniform, the mixture after mixing can burn more fully, the flame is more stable, and the combustion efficiency is higher.

[0051] Optionally, as Figure 14 shown, each of the circumferentially distributed injection holes 6 is arranged in an alternating pattern of large and small holes. This structure can further effectively improve the mixing effect of the waste gas fuel and the air, and the mixing is further more uniform.

[0052] Embodiment 2

[0053] This embodiment is similar to Embodiment 1, and the difference is that, as Figure 15 shown, the injection hole 6 at the end of the rear-section air pipe 42 is a straight through hole directly connected to the inside of the rear-section air pipe 42. This structure can limit the mixing of the waste gas fuel and the air, and can be reasonably selected according to parameters such as the type, calorific value, density, and flow rate of the waste gas during use to achieve the expected combustion effect.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A burner for low calorific value waste gas fuel, comprising a combustion chamber (1), a swirler (2), and a fuel pipe (3) and an air pipe (4) connected to the combustion chamber (1), characterized in that, The cyclone (2) is arranged in the fuel pipe (3) to cause the waste gas fuel flowing in the fuel pipe (3) to form a swirl and then enter the combustion chamber (1) to form a recirculation zone and mix with the air ejected from the air pipe (4). It also includes an auxiliary fuel pipe (7) and an air flow passage (8) connected to the combustion chamber (1). The auxiliary fuel pipe (7) is sleeved on the outer periphery of the fuel pipe (3), and an annular auxiliary passage (9) is formed between the auxiliary fuel pipe (7) and the fuel pipe (3). An auxiliary cyclone (10) is arranged around in the annular auxiliary passage (9), and the annular auxiliary passage (9) is connected to the air flow passage (8) through a plurality of auxiliary injection holes (11) distributed circumferentially; The air pipe (4) is inserted into the fuel pipe (3) and an annular passage (5) is formed between the air pipe (4) and the fuel pipe (3). The cyclone (2) is arranged around in the annular passage (5). The air pipe (4) is provided with a plurality of injection holes (6) distributed circumferentially, and the air pipe (4) is connected to the annular passage (5) through each injection hole (6); The air jet input by the air pipe (4) will be ejected in all directions simultaneously in the annular passage (5) through each of the circumferentially distributed injection holes (6), and the air jet can be mixed with the swirl of the waste gas fuel from multiple directions; The air jet input from the air flow passage (8) will be ejected from all directions simultaneously in the annular auxiliary passage (9) through each of the circumferentially distributed auxiliary injection holes (11), and the air jet can be mixed with the swirl of the waste gas fuel in the annular auxiliary passage (9) from multiple directions.

2. The burner for low calorific value waste gas fuel according to claim 1, characterized in that, Each of the injection holes (6) is close to the combustion chamber (1).

3. The burner for low calorific value waste gas fuel according to claim 1, characterized in that, The auxiliary injection hole (11) is close to the injection outlet of the auxiliary fuel pipe (7).

4. The burner for low calorific value waste gas fuel according to claim 3, characterized in that, A plurality of the auxiliary injection holes (11) are arranged in several columns along the length direction of the annular auxiliary passage (9) and are circumferentially distributed between the annular auxiliary passage (9) and the air flow passage (8).

5. The burner for low calorific value waste gas fuel according to claim 1, characterized in that, The air flow passage (8) is an annular passage integrally formed in the wall of the auxiliary fuel pipe (7), and a plurality of the auxiliary injection holes (11) are integrally formed in the wall of the auxiliary fuel pipe (7).

6. The burner for low calorific value waste gas fuel according to any one of claims 1 to 5, characterized in that, The fuel pipe (3) is divided into a front-section fuel pipe (31) and a rear-section fuel pipe (32). One end of the rear-section fuel pipe (32) is connected to the combustion chamber (1), and the other end is threadedly connected to the front-section fuel pipe (31); the air pipe (4) is divided into a front-section air pipe (41) and a rear-section air pipe (42). One end of the rear-section air pipe (42) is close to the injection outlet of the fuel pipe (3), and the other end is threadedly connected to the front-section air pipe (41). A plurality of the injection holes (6) are circumferentially distributed on the wall of the rear-section air pipe (42) close to the combustion chamber (1).

7. The burner for low calorific value waste gas fuel according to claim 6, characterized in that, A plurality of the injection holes (6) are arranged in several columns along the length direction of the rear-section air pipe (42) and are circumferentially distributed on the rear-section air pipe (42).

8. The burner for low calorific value waste gas fuel according to claim 7, characterized in that, Each of the circumferentially distributed injection holes (6) is arranged in an alternating pattern of large and small holes.

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