A mixed gas and flue gas internal circulation burner

Abstract

The present invention relates to the field of burners, and discloses a mixed gas and flue gas internal circulation burner for installation on a furnace, comprising: a central fire combustion tube, arranged in the furnace and located at the center of the furnace; a combustible gas pipeline for conveying combustible gas, the central fire combustion tube being connected to the combustible gas pipeline; at least two peripheral premixing nozzle assemblies arranged circumferentially along the central fire combustion tube, the peripheral premixing nozzle assembly comprising a gas premixing tube and an internal gas nozzle for conveying combustible gas, the gas premixing tube being arranged in the furnace, one end of the internal gas nozzle extending into the furnace, the gas outlet end of the internal gas nozzle extending from the end of the gas premixing tube near the front end of the furnace into the interior of the gas premixing tube, the flue gas generated at the end of the gas premixing tube away from the front end of the furnace can enter the interior of the gas premixing tube from the end of the gas premixing tube near the front end of the furnace and mix with the combustible gas. The burner has lower investment and operating costs, does not have the hazard of flue gas condensation, and operates more safely and stably.

Description

Technical Field

[0001] The present invention relates to the field of burners, in particular to a mixed gas and smoke internal circulation burner. Background Art

[0002] Although natural gas is essentially free of sulfur and dust, and does not emit sulfur dioxide or dust pollutants, it still produces nitrogen oxides during combustion, which also contribute to atmospheric pollution. To meet environmental protection needs, various countries have developed a variety of low-NOx gas burners, primarily utilizing technologies such as air staging, fuel staging, premixed combustion, and flue gas recirculation. With increasing environmental protection requirements, the requirements for NOx emissions from burners are also becoming increasingly stringent. Extensive data demonstrates that flue gas recirculation is an essential emission reduction measure to achieve such low NOx emissions. Flue gas recirculation reduces peak combustion temperature and lowers the oxygen concentration within the combustion furnace, both of which contribute to lower NOx emissions.

[0003] At present, the commonly used flue gas recirculation method for burners is external circulation, that is, the flue gas is introduced into the burner inlet through the flue gas duct. This method is easy to implement, has significant effects, and the circulation volume is controllable. The disadvantage is that it requires the addition of a recirculating flue gas duct. After the flue gas and air mix, condensation water is easily formed, which affects the stability of the burner detection equipment and the combustion stability. In addition, it also increases investment and operating costs.

[0004] Therefore, how to overcome the above-mentioned defects has become a problem that those skilled in the art continue to solve. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a mixed gas and flue gas internal circulation burner which has no hazard of flue gas condensate, is safer and more stable in operation, and has low investment and operation costs.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a mixed gas and flue gas internal circulation burner, comprising:

[0008] furnace;

[0009] A central fire combustion tube is provided in the furnace and is located at the center of the furnace;

[0010] A combustible gas pipeline, the combustible gas pipeline is used to transport combustible gas, and the central fire combustion cylinder is connected to the combustible gas pipeline;

[0011] At least two peripheral premixing nozzle assemblies are arranged circumferentially along the central fire combustion tube, and the peripheral premixing nozzle assembly includes a gas premixing tube and an internal gas nozzle for conveying combustible gas. The gas premixing tube is arranged in the furnace, and one end of the internal gas nozzle extends into the furnace, and the gas outlet end of the internal gas nozzle extends into the interior of the gas premixing tube from the end of the gas premixing tube close to the front end of the furnace. The flue gas generated at the end of the gas premixing tube away from the front end of the furnace can enter the interior of the gas premixing tube from the end of the gas premixing tube close to the front end of the furnace and mix with the combustible gas.

[0012] Optionally, the mixed gas and flue gas internal circulation burner also includes an external air nozzle, which is sleeved on the outside of the internal gas nozzle, one end of the external air nozzle extends into the furnace and at least extends to be flush with the end of the gas premixing cylinder close to the front end of the furnace, the internal gas nozzle, the external air nozzle and the gas premixing cylinder are coaxially arranged, and the diameters of the three increase successively, and an air interlayer for conveying air is formed between the external air nozzle and the internal gas nozzle.

[0013] Optionally, the mixed gas and flue gas internal circulation burner further includes:

[0014] an intermediate gas pipeline, one end of which abuts against the furnace, the intermediate gas pipeline having a closed combustible gas annular cavity therein, the closed combustible gas annular cavity being in communication with the combustible gas pipeline, each of the inner gas nozzles being in communication with the closed combustible gas annular cavity, the middle portion of the closed combustible gas annular cavity being a central air passage, the central air passage being in communication with an air pipeline for conveying air, a distance being provided between the end of the closed combustible gas annular cavity near the furnace and the furnace to form an air intake cavity between the closed combustible gas annular cavity and the furnace, and each of the air interlayers being in communication with the air intake cavity;

[0015] a premixed air regulating sleeve, the premixed air regulating sleeve being coaxially arranged with the central air passage, the outer diameter of the premixed air regulating sleeve being equal to the inner diameter of the central air passage, the premixed air regulating sleeve being slidably arranged in the central air passage, the length of the premixed air regulating sleeve being greater than the spacing, and when the premixed air regulating sleeve abuts against the furnace, the premixed air regulating sleeve cuts off the air passage between the central air passage and the air intake cavity, and when the premixed air regulating sleeve is separated from the furnace, the air passage between the central air passage and the air intake cavity is connected;

[0016] A linear drive device is connected to the premixed air regulating sleeve to drive the premixed air regulating sleeve to move along the axial direction of the central air channel.

[0017] Optionally, the mixed gas and flue gas internal circulation burner also includes at least two connecting and fixing plates, all of which are partially arranged inside the gas premixing cylinder, and all of which are arranged along the circumference of the gas premixing cylinder. On the opposite sides of each of the connecting and fixing plates, one of them is connected to the gas premixing cylinder, and the other is connected to the internal gas nozzle, and each of the connecting and fixing plates is provided with a slot that matches the shape of the external air nozzle.

[0018] Optionally, the end of the internal combustion gas nozzle extending into the interior of the furnace is a conical structure, and at least two gas outlet holes are circumferentially arranged on the outer wall of the conical structure, and the diameter of the conical structure gradually decreases from the end close to the bottom end of the furnace to the end away from the front end of the furnace.

[0019] Optionally, the length of the gas premixing cylinder is less than or equal to 150 mm.

[0020] Optionally, the mixed gas and flue gas internal circulation burner also includes a hydrogen pipeline and a natural gas pipeline. The combustible gas includes hydrogen and natural gas. The hydrogen pipeline is used to transport hydrogen, and the natural gas pipeline is used to transport natural gas. The hydrogen pipeline and the natural gas pipeline are both connected to the combustible gas pipeline.

[0021] Optionally, the mixed gas and flue gas internal circulation burner also includes a Venturi mixer, which includes a pipe body, a first conical sleeve and a second conical sleeve, the first conical sleeve and the second conical sleeve are both arranged inside the pipe body, the small end of the first conical sleeve and the small end of the second conical sleeve are arranged opposite to each other, the small end of the second conical sleeve is sleeved on the outside of the small end of the first conical sleeve, and an annular gap for gas to pass through is formed between the small end of the first conical sleeve and the small end of the second conical sleeve, a accommodating cavity is formed between the first conical sleeve and the second conical sleeve and the inner wall of the pipe body, the hydrogen pipeline is connected to the accommodating cavity, the end of the pipe body close to the large end of the first conical sleeve is connected to the natural gas pipeline, and the end of the pipe body away from the large end of the first conical sleeve is connected to the combustible gas pipeline.

[0022] Optionally, the mixed gas and flue gas internal circulation burner also includes a control element, a flow detection device, a first gas pressure detection device, a second gas pressure detection device and a first regulating valve. The hydrogen pipeline is provided with the flow detection device for detecting the internal flow of the hydrogen pipeline, the first gas pressure detection device for detecting the internal pressure of the hydrogen pipeline and the first regulating valve for regulating the internal flow of the hydrogen pipeline. The combustible gas pipeline is provided with the second gas pressure detection device for detecting the internal pressure of the combustible gas pipeline. The flow detection device, the first gas pressure detection device, the second gas pressure detection device and the first regulating valve are all communicatively connected to the control element.

[0023] Optionally, the mixed gas and flue gas internal circulation burner also includes an ignition gun and an ignition long flame pipe, the ignition gun is arranged in the furnace, one end of the ignition long flame pipe is connected to the natural gas pipeline, and the other end of the ignition long flame pipe is connected to the ignition gun.

[0024] Compared with the prior art, the present invention has achieved the following technical effects:

[0025] The mixed gas and flue gas internal circulation burner provided by the present invention comprises: a furnace; a central fire combustion tube, which is arranged in the furnace and located in the center of the furnace; a combustible gas pipeline, which is used to transport combustible gas, and the central fire combustion tube is connected to the combustible gas pipeline; at least two peripheral premixing nozzle assemblies arranged circumferentially along the central fire combustion tube, the peripheral premixing nozzle assembly comprises a gas premixing tube and an internal gas nozzle for transporting combustible gas, the gas premixing tube is arranged in the furnace, one end of the internal gas nozzle extends into the furnace, the outlet end of the internal gas nozzle extends from the end of the gas premixing tube close to the front end of the furnace into the interior of the gas premixing tube, the flue gas generated at the end of the gas premixing tube away from the front end of the furnace can enter the interior of the gas premixing tube from the end of the gas premixing tube close to the front end of the furnace and mix with the combustible gas.

[0026] During specific use, the pressure jet effect of the combustible gas in the gas premixing cylinder and the kinetic energy generated by combustion cause the hot flue gas to move toward the front end of the furnace. At the same time, due to the suction effect of the flue gas movement, a suction reflux is generated at one end of the gas premixing cylinder close to the front end of the furnace, and the flue gas is re-drawn into the gas premixing cylinder. Due to the presence of inert gases such as carbon dioxide in the flue gas, after the flue gas is mixed with the combustible gas, oxygen-deficient combustion will be formed in the gas premixing cylinder, which can reduce the emission of nitrogen oxides. It can be seen that the flue gas circulation method of the mixed gas and flue gas internal circulation burner provided by the present invention is internal circulation. This method does not require the addition of an external recirculating flue gas pipe, does not have the hazard of flue gas condensation water, is safe and stable in operation, and has lower investment and operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a schematic structural diagram of a mixed gas and flue gas internal circulation burner provided in an embodiment of the present invention;

[0029] Figure 2 A longitudinal cross-sectional view of a peripheral premixing nozzle assembly of a mixed gas and flue gas internal circulation burner provided in an embodiment of the present invention;

[0030] Figure 3 A transverse cross-sectional view of a peripheral premixing nozzle assembly of a mixed gas and flue gas internal circulation burner provided in an embodiment of the present invention;

[0031] Figure 4 Schematic diagram of the arrangement of the flame stabilizing disk and the gas premixing cylinder of the mixed gas and flue gas internal circulation burner provided in an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the arrangement of the intermediate gas pipeline and the premixed air adjustment sleeve of the mixed gas and flue gas internal circulation burner provided in an embodiment of the present invention;

[0033] Figure 6 for Figure 5 An enlarged view of part I;

[0034] Figure 7 This is a schematic structural diagram of a Venturi mixer for a mixed gas and flue gas internal circulation burner provided in an embodiment of the present invention.

[0035] Figure 1-Figure 7Explanation of the reference numerals: 1. furnace; 2. central fire combustion tube; 3. gas premixing tube; 4. inner gas nozzle; 5. outer air nozzle; 6. air interlayer; 7. central air channel; 8. closed combustible gas annular cavity; 9. premixed air regulating sleeve; 10. connecting fixing plate; 11. gas outlet nozzle; 12. hydrogen pipeline; 13. natural gas pipeline; 14. venturi mixer; 1401. pipe body; 1402. first conical sleeve; 1403. second conical sleeve; 1404. accommodating chamber; 1405. annular gap; 15. control element; 16. flow detection device; 17. first gas pressure detection device; 18. second Gas pressure detection device; 19. First regulating valve; 20. Ignition long flame pipe; 21. Ignition gun; 22. Flame stabilizing disk; 23. Main nozzle; 24. Main pipe; 25. First branch pipe; 26. Second branch pipe; 27. Second regulating valve; 28. First manual shut-off valve; 29. ​​First filter; 30. First pressure reducing valve; 31. Second manual shut-off valve; 32. Second filter; 33. Second pressure reducing valve; 34. Third pressure reducing valve; 35. Shut-off valve; 36. Flue gas flow; 37. Air flow; 38. Combustible gas flow; 40. Air pipe; 41. Blower; 41. Air intake cavity; 42. Refractory ring. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] The purpose of the present invention is to provide a mixed gas and flue gas internal circulation burner which has no hazard of flue gas condensate, operates safely and stably, and has low investment and operating costs.

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] refer to Figure 1-Figure 7 As shown, the mixed gas and flue gas internal circulation burner provided in the embodiment of the present invention includes: a furnace 1, a central fire combustion tube 2, a combustible gas pipeline and at least two peripheral premixing nozzle assemblies.

[0040] Specifically, the central fire combustion tube 2 is disposed in the furnace 1 and located at the center of the furnace 1 , and the axis of the central fire combustion tube 2 coincides with the axis of the furnace 1 .

[0041] The combustible gas pipeline is used to transport combustible gas, and the combustible gas pipeline is connected to the central fire combustion tube 2 to transport the combustible gas into the central fire combustion tube 2.

[0042] The detailed number of peripheral premixing nozzle assemblies is determined according to the output power of the burner, preferably more than three, and all peripheral premixing nozzle assemblies are arranged circumferentially along the central fire combustion tube 2. The peripheral premixing nozzle assembly includes a gas premixing tube 3 and an internal gas nozzle 4 for conveying combustible gas. The gas premixing tube 3 is arranged in the furnace 1, and one end of the internal gas nozzle 4 extends into the furnace 1. The gas outlet end of the internal gas nozzle 4 extends from the end of the gas premixing tube 3 close to the front end of the furnace 1 into the gas premixing tube 3. The flue gas generated at the end of the gas premixing tube 3 away from the front end of the furnace 1 can enter the gas premixing tube 3 from the end of the gas premixing tube 3 close to the front end of the furnace 1 and mix with the combustible gas. It should be noted that the furnace 1 is arranged in accordance with Figure 5 When arranged in the manner shown, the bottom end of the furnace 1 is the front end of the furnace 1 .

[0043] The flue gas circulation mode of the mixed gas and flue gas internal circulation burner provided by the present invention is internal circulation. This mode does not require the installation of a recirculating flue gas duct, does not have the hazard of flue gas condensate, is safe and stable in operation, and has lower investment and operation costs. During specific use, the jet effect of the combustible gas in the gas premixing cylinder 3 and the kinetic energy generated by combustion cause the hot flue gas to move toward the direction close to the front end of the furnace 1. At the same time, due to the suction effect of the flue gas movement, a suction reflux is generated at one end of the gas premixing cylinder 3 close to the front end of the furnace 1, and the flue gas flow 36 is re-drawn into the gas premixing cylinder 3. The main component of the flue gas is carbon dioxide. After the flue gas is mixed with the combustible gas flow 38, oxygen-deficient combustion is formed in the gas premixing cylinder 3, which can effectively reduce the emission of nitrogen oxides.

[0044] In another embodiment of the present invention, the mixed gas and flue gas internal circulation burner further includes an external air nozzle 5, which is mounted on the outside of the internal gas nozzle 4. One end of the external air nozzle 5 extends into the furnace 1 and at least extends to be flush with the end of the gas premixing cylinder 3 close to the front end of the furnace 1. Figure 3 Specifically, the end of the external air nozzle 5 extending into the furnace 1 is extended to be flush with the end of the gas premixing tube 3 close to the front end of the furnace 1. Figure 3 As shown, the inner gas nozzle 4, the outer air nozzle 5 and the gas premixing cylinder 3 are coaxially arranged, and the diameters of the three increase successively. An air interlayer 6 for conveying air is formed between the outer air nozzle 5 and the inner gas nozzle 4.

[0045] During operation, air flow 37 passes through air layer 6 and enters the gas premixing cylinder 3, where it mixes with flue gas flow 36 and combustible gas flow 38 before combustion. Compared to direct combustion without premixing, the premixing method provided in the embodiments of the present invention provides more stable combustion, higher thermal efficiency, and lower nitrogen oxide emissions. Furthermore, air layer 6 surrounds the exterior of the internal gas nozzle 4. When air is introduced into air layer 6, it lowers the temperature of the internal gas nozzle 4, thereby extending the service life of the internal gas nozzle 4.

[0046] Further, refer to Figure 5 As shown, the mixed gas and flue gas internal circulation burner also includes an intermediate gas pipeline, a premixed air adjustment sleeve 9 and a linear drive device.

[0047] Specifically, one end of the intermediate gas pipeline abuts against the furnace 1. A closed annular cavity 8 for combustible gas is defined within the intermediate gas pipeline. This cavity 8 communicates with the combustible gas pipeline, and each inner gas nozzle 4 communicates with this cavity 8. Combustible gas is transported to each inner gas nozzle 4 via the closed annular cavity. A central air passage 7 is located in the middle of the closed annular cavity 8. This central air passage 7 communicates with the central fire burner 2 and an air duct 40 for transporting air. The air duct 40 is connected to, for example, a blower 41. A gap exists between the end of the closed annular cavity 8 closest to the furnace 1, forming an air intake cavity 41 between the closed annular cavity 8 and the furnace 1. Each air layer 6 communicates with the air intake cavity 41, and air passes through the intake air to reach each air layer 6. More specifically, a refractory ring 42 is provided in the middle of the furnace 1 , the front end of the refractory ring 42 is flush with the front end of the furnace 1 , and an air intake cavity 41 is formed between the closed combustible gas annular cavity 8 and the refractory ring 42 of the furnace 1 .

[0048] The premixed air regulating sleeve 9 is coaxially arranged with the central air passage 7. The outer diameter of the premixed air regulating sleeve 9 is equal to the diameter of the central air passage 7. The premixed air regulating sleeve 9 is slidably arranged in the central air passage 7. The central air passage 7 is connected to the premixed air regulating sleeve 9. The length of the premixed air regulating sleeve 9 is greater than the spacing. The premixed air regulating sleeve 9 is used to cut off or connect the air passage between the central air passage 7 and the air intake cavity 41. During the process of the premixed air regulating sleeve 9 sliding along the axis of the central air passage 7, when the premixed air regulating sleeve 9 abuts against the refractory ring 42 of the furnace 1, the premixed air regulating sleeve 9 cuts off the air passage between the central air passage 7 and the air intake cavity 41, and air cannot reach the air intake cavity 41. When the premixed air regulating sleeve 9 separates from the refractory ring 42 of the furnace 1, the air passage between the central air passage 7 and the air intake cavity 41 is connected, and air can enter the air intake cavity 41. In addition, the amount of air entering the gas premixing cylinder 3 can be adjusted by changing the distance between the premixed air regulating sleeve 9 and the refractory ring 42 of the furnace 1. Figure 5 The direction indicated by the arrow is the direction of air flow.

[0049] The linear drive device is connected to the premixed air regulating sleeve 9 to drive the premixed air regulating sleeve 9 to move along the axis direction of the central air channel 7. The linear drive device includes but is not limited to an electric push rod.

[0050] During specific use, by adjusting the amount of air entering the gas premixing cylinder 3, the generation of CO can be reduced, while avoiding the occurrence of unstable combustion due to excessive mixing of flue gas.

[0051] Furthermore, if Figure 3 As shown, the mixed gas and flue gas internal circulation burner also includes at least two connecting and fixing plates 10. All the connecting and fixing plates 10 are partially arranged inside the gas premixing cylinder 3, and all the connecting and fixing plates 10 are arranged along the circumference of the gas premixing cylinder 3. On the opposite sides of each connecting and fixing plate 10, one of them is connected to the gas premixing cylinder 3, and the other is connected to the internal gas nozzle 4. Each connecting and fixing plate 10 is provided with a slot that matches the shape of the external air nozzle 5, and the external air nozzle 5 is partially inserted into the slot. The relative positions of the internal gas nozzle 4, the external air nozzle 5 and the gas premixing cylinder 3 are maintained by using the connecting and fixing plates 10. It should be noted that it is not limited to using the connecting and fixing plates 10 to maintain the relative positions of the internal gas nozzle 4, the external air nozzle 5 and the gas premixing cylinder 3. Other connecting parts can also be used to maintain the relative positions of the internal gas nozzle 4, the external air nozzle 5 and the gas premixing cylinder 3. This is just an example.

[0052] In another embodiment of the present invention, Figure 3As shown, the end of the internal gas nozzle 4 extending into the furnace 1 is a tapered structure. The outer wall of the tapered structure is circumferentially provided with at least two gas outlet holes 11. The specific number of gas outlet holes 11 is determined by the burner output power, and preferably three or more. The diameter of the tapered structure gradually decreases from the end near the bottom of the furnace 1 to the end away from the front end of the furnace 1. The small end of the tapered structure has a main nozzle hole 23 connected to the interior of the internal gas nozzle 4. The specific number of gas outlet holes 11 depends on actual needs. With this arrangement, at high gas pressures, for example, 1-2 bar, the main nozzle holes 23 and gas outlet holes 11 can form a relatively dispersed gas flow of the combustible gas, thereby better mixing the combustible gas with the flue gas and air.

[0053] In another embodiment of the present invention, in order to ensure that the combustible gas can be evenly mixed with the flue gas and air, the length of the gas premixing cylinder 3 is less than or equal to 150 mm. For example, the length of the gas premixing cylinder 3 is 130 mm-150 mm.

[0054] In another embodiment of the present invention, Figure 1 As shown, the mixed gas and flue gas internal circulation burner also includes a hydrogen pipeline 12 and a natural gas pipeline 13. The combustible gases include hydrogen and natural gas. The hydrogen pipeline 12 is connected to a hydrogen source for transporting hydrogen, and the natural gas pipeline 13 is connected to a natural gas source for transporting natural gas. Both the hydrogen pipeline 12 and the natural gas pipeline 13 are connected to the combustible gas pipeline. Compared to burning pure natural gas, the addition of hydrogen can reduce the formation of carbon oxides.

[0055] Furthermore, the mixed gas and flue gas internal circulation burner also includes a Venturi mixer 14, which includes a pipe body 1401, a first conical sleeve 1402 and a second conical sleeve 1403. The first conical sleeve 1402 and the second conical sleeve 1403 are both arranged inside the pipe body 1401, and the small end of the first conical sleeve 1402 is arranged opposite to the small end of the second conical sleeve 1403. The small end of the second conical sleeve 1403 is installed on the outside of the small end of the first conical sleeve 1402. An annular gap 1405 for gas to pass through is formed between the small end of the first conical sleeve 1402 and the small end of the second conical sleeve 1403. The specific size of the annular gap 1405 depends on actual needs. An accommodating cavity 1404 is formed between the first conical sleeve 1402, the second conical sleeve 1403 and the inner wall of the tube body 1401. The hydrogen pipeline 12 is connected to the accommodating cavity 1404. The end of the tube body 1401 close to the large end of the first conical sleeve 1402 is connected to the natural gas pipeline 13, and the end of the tube body 1401 away from the large end of the first conical sleeve 1402 is connected to the combustible gas pipeline. Figure 7 When arranged in this manner, the left end is connected to the natural gas pipeline 13, and the right end is connected to the combustible gas pipeline.

[0056] The use of the Venturi mixer 14 to mix hydrogen and natural gas has the following advantages:

[0057] 1. Natural gas will not flow back and will not enter the hydrogen pipeline 12;

[0058] 2. Hydrogen can enter natural gas smoothly, and the natural gas and hydrogen are mixed evenly;

[0059] 3. The natural gas and hydrogen flow passages have low resistance, reducing noise pollution caused by gas friction;

[0060] 4. The above reasons can ensure that the mixed gas always maintains the predetermined mixing ratio, ensure the stability and consistency of the combustion components, and prevent sudden vibration of combustion.

[0061] Furthermore, the pressure inside the first conical sleeve 1402 is greater than the pressure inside the accommodating chamber 1404, and the pressure inside the accommodating chamber 1404 is greater than the pressure inside the second conical sleeve 1403. With this arrangement, the natural gas and hydrogen are mixed better and the mixing ratio is more stable.

[0062] In another embodiment of the present invention, Figure 1 As shown, the mixed gas and flue gas internal circulation burner also includes a control element 15, a flow detection device 16, a first gas pressure detection device 17, a second gas pressure detection device 18, a first regulating valve 19, and a second regulating valve 27. The flow detection device 16 is disposed on the hydrogen pipeline 12 and is used to detect the flow rate within the hydrogen pipeline 12. The first gas pressure detection device 17 is disposed on the hydrogen pipeline 12 and is used to detect the internal pressure of the hydrogen pipeline 12. The first regulating valve 19 is disposed on the hydrogen pipeline 12 and is used to regulate the flow rate within the hydrogen pipeline 12. The second gas pressure detection device 18 is disposed on the combustible gas pipeline and is used to detect the internal pressure of the combustible gas pipeline. The flow detection device 16, the first gas pressure detection device 17, the second gas pressure detection device 18, and the first regulating valve 19 are all communicatively connected to the control element 15. The control element 15 includes, but is not limited to, a PLC controller. The flow detection device 16 includes, but is not limited to, a flow meter. The first gas pressure detection device 17 and the second gas pressure detection device 18 both include, but are not limited to, pressure sensors. The first regulating valve 19 includes, but is not limited to, a pneumatic regulating valve.

[0063] During specific use, the flow detection device 16 transmits the detected flow information inside the hydrogen pipeline 12 to the control element 15, the first gas pressure detection device 17 transmits the detected pressure information inside the hydrogen pipeline 12 to the control element 15, and the second gas pressure detection device 18 transmits the detected pressure information inside the combustible gas pipeline to the control element 15. The control element 15 controls the opening degree of the first regulating valve 19 according to the internal flow information of the hydrogen pipeline 12 and the difference between the internal pressure of the combustible gas pipeline and the internal pressure of the hydrogen pipeline 12, thereby obtaining the required hydrogen and natural gas mixing ratio.

[0064] Furthermore, if Figure 1 and Figure 5 As shown, the combustible gas pipeline includes a main pipeline 24, a first branch pipeline 25, and a second branch pipeline 26. The main pipeline 24 is connected to the tube body 1401 of the venturi mixer 14. The second gas pressure detection device 18 is installed on the main pipeline 24 to detect the internal pressure of the main pipeline 24. The first branch pipeline 25 and the second branch pipeline 26 are both connected to the main pipeline 24. The first branch pipeline 25 is connected to the closed combustible gas annular cavity 8, and the second branch pipeline 26 is connected to the center fire combustion tube 2.

[0065] Furthermore, if Figure 1 As shown, the mixed gas and flue gas internal circulation burner also includes a second regulating valve 27, which is set on the first branch pipe and is used to adjust the internal flow of the first branch pipe. In specific use, the opening degree of the second regulating valve 27 is controlled according to the required load output.

[0066] Furthermore, if Figure 1 As shown, hydrogen pipeline 12 also includes a first manual shut-off valve 28, a first filter 29, and a first pressure reducing valve 30. These valves are arranged sequentially along the direction of hydrogen delivery. The first manual shut-off valve 28 is used to open and close hydrogen pipeline 12, the first pressure reducing valve 30 is used to reduce the internal pressure of hydrogen pipeline 12, and the first filter 29 is used to filter hydrogen. Natural gas pipeline 13 includes a second manual shut-off valve 31, a second filter 32, and a second pressure reducing valve 33, all arranged sequentially along the direction of natural gas delivery. The second manual shut-off valve 31 is used to open and close natural gas pipeline 13, the second filter 32 is used to filter natural gas, and the second pressure reducing valve 33 is used to reduce the internal pressure of natural gas pipeline 13.

[0067] In another embodiment of the present invention, Figure 1 、 Figure 5 as well as Figure 6As shown, the mixed gas and flue gas internal circulation burner also includes an ignition gun 21 and an ignition pilot flame pipe 20. The ignition gun 21 is disposed in the furnace 1. One end of the ignition pilot flame pipe 20 is connected to the natural gas pipeline 13, and the other end of the ignition pilot flame pipe 20 is connected to the ignition gun 21. During specific use, by setting the ignition gun 21 as the pilot flame, the mixed gas and flue gas internal circulation burner can ensure long-term stable combustion.

[0068] Furthermore, if Figure 5 and Figure 6 As shown, the ignition gun 21 is coaxially arranged with the central fire combustion tube 2, and the ignition gun 21 is arranged at the center of the central fire combustion tube 2. A flame stabilizing disk 22 is provided at the outlet end of the central fire combustion tube 2, and the second branch pipe 26 is connected to the pressure stabilizing disk. As an optional embodiment, the flame stabilizing disk 22 is a swirl flame stabilizing disk.

[0069] Furthermore, a third pressure reducing valve 34 and a shut-off valve 35 are sequentially arranged on the ignition pilot flame pipeline 20 along the gas delivery direction. The third pressure reducing valve 34 is used to reduce the internal pressure of the ignition pilot flame pipeline 20, and the shut-off valve 35 is used to open and close the ignition pilot flame pipeline 20.

[0070] In the description of the present invention, it should be noted that certain words indicating orientation or positional relationships are only for the purpose of facilitating the description of the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0071] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A mixed gas and flue gas internal circulation burner, characterized in that: The invention is used to be installed on a furnace, comprising: a central fire combustion cylinder, the central fire combustion cylinder is arranged in the furnace and is located in the center of the furnace; a combustible gas pipeline, the combustible gas pipeline is used to transport combustible gas, the central fire combustion cylinder is connected to the combustible gas pipeline; at least two peripheral premixing nozzle assemblies arranged along the circumference of the central fire combustion cylinder, the peripheral premixing nozzle assembly comprises a gas premixing cylinder and an internal gas nozzle for transporting combustible gas, the gas premixing cylinder is arranged in the furnace, one end of the internal gas nozzle extends into the furnace, and the gas outlet end of the internal gas nozzle extends into the gas from the end of the gas premixing cylinder close to the front end of the furnace Inside the premixing cylinder, flue gas generated at an end of the gas premixing cylinder away from the front end of the furnace can enter the gas premixing cylinder from an end of the gas premixing cylinder close to the front end of the furnace and mix with the combustible gas; the premixing cylinder also includes an external air nozzle, the external air nozzle is sleeved on the outside of the internal gas nozzle, one end of the external air nozzle extends into the furnace and extends at least to be flush with the end of the gas premixing cylinder close to the front end of the furnace, the internal gas nozzle, the external air nozzle and the gas premixing cylinder are coaxially arranged, and the diameters of the three increase in sequence, and an air interlayer for conveying air is formed between the external air nozzle and the internal gas nozzle; The vents are connected to the combustion chamber, and the vents are connected to the combustion chamber. The vents are connected to the combustion chamber, and the combustion chamber is connected to the combustion chamber. The vents are connected to the combustion chamber, and the combustion chamber is connected to the combustion chamber. The vents are connected to the combustion chamber, and the combustion chamber is connected to the combustion chamber. The vents are connected to the combustion chamber, and the combustion chamber is connected to the combustion chamber. The channels are coaxially arranged, the outer diameter of the premixed air regulating sleeve is equal to the inner diameter of the central air channel, the premixed air regulating sleeve can be slidably arranged in the central air channel, the length of the premixed air regulating sleeve is greater than the spacing, when the premixed air regulating sleeve is against the furnace, the premixed air regulating sleeve cuts off the air passage between the central air channel and the air intake cavity, and when the premixed air regulating sleeve is separated from the furnace, the air passage between the central air channel and the air intake cavity is connected; a linear drive device, the linear drive device is connected to the premixed air regulating sleeve to drive the premixed air regulating sleeve to move along the axial direction of the central air channel.

2. The mixed gas and flue gas internal circulation burner according to claim 1, characterized in that: It also includes at least two connecting and fixing plates, all of which are partially arranged inside the gas premixing cylinder, and all of which are arranged along the circumference of the gas premixing cylinder. On opposite sides of each of the connecting and fixing plates, one of them is connected to the gas premixing cylinder, and the other is connected to the internal gas nozzle, and each of the connecting and fixing plates is provided with a slot that matches the shape of the external air nozzle.

3. The mixed gas and flue gas internal circulation burner according to claim 1, characterized in that: The end of the internal combustion gas nozzle extending into the interior of the furnace is a conical structure, and the outer wall of the conical structure is circumferentially provided with at least two gas outlet holes, and the diameter of the conical structure gradually decreases from the end close to the bottom end of the furnace to the end away from the front end of the furnace.

4. The mixed gas and flue gas internal circulation burner according to claim 1, characterized in that: The length of the gas premixing cylinder is less than or equal to 150 mm.

5. The mixed gas and flue gas internal circulation burner according to any one of claims 1 to 4, characterized in that: It also includes a hydrogen pipeline and a natural gas pipeline. The combustible gas includes hydrogen and natural gas. The hydrogen pipeline is used to transport hydrogen, and the natural gas pipeline is used to transport natural gas. The hydrogen pipeline and the natural gas pipeline are both connected to the combustible gas pipeline.

6. The mixed gas and flue gas internal circulation burner according to claim 5, characterized in that: It also includes a Venturi mixer, which includes a pipe body, a first conical sleeve and a second conical sleeve, the first conical sleeve and the second conical sleeve are both arranged inside the pipe body, the small end of the first conical sleeve is arranged opposite to the small end of the second conical sleeve, the small end of the second conical sleeve is sleeved on the outside of the small end of the first conical sleeve, an annular gap for gas to pass through is formed between the small end of the first conical sleeve and the small end of the second conical sleeve, an accommodating cavity is formed between the first conical sleeve and the second conical sleeve and the inner wall of the pipe body, the hydrogen pipeline is connected to the accommodating cavity, one end of the pipe body close to the large end of the first conical sleeve is connected to the natural gas pipeline, and one end of the pipe body away from the large end of the first conical sleeve is connected to the combustible gas pipeline.

7. The mixed gas and flue gas internal circulation burner according to claim 5, characterized in that: It also includes a control element, a flow detection device, a first gas pressure detection device, a second gas pressure detection device and a first regulating valve. The hydrogen pipeline is provided with the flow detection device for detecting the flow inside the hydrogen pipeline, the first gas pressure detection device for detecting the internal pressure of the hydrogen pipeline and the first regulating valve for regulating the flow inside the hydrogen pipeline. The combustible gas pipeline is provided with the second gas pressure detection device for detecting the internal pressure of the combustible gas pipeline. The flow detection device, the first gas pressure detection device, the second gas pressure detection device and the first regulating valve are all communicatively connected to the control element.

8. The mixed gas and flue gas internal circulation burner according to claim 5, characterized in that: It also includes an ignition gun and an ignition pilot flame pipe. The ignition gun is arranged in the furnace. One end of the ignition pilot flame pipe is connected to the natural gas pipeline, and the other end of the ignition pilot flame pipe is connected to the ignition gun.

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