Dual fuel burner and boiler assembly

Abstract

The application discloses a mixed combustion burner and a boiler assembly, the mixed combustion burner comprising: an airflow channel, an air inlet stabilizing element, a hydrogen-oxygen manifold baffle and an air inlet distributor, the air inlet stabilizing element, the hydrogen-oxygen manifold baffle and the air inlet distributor are all arranged in the airflow channel and sequentially arranged in the airflow direction, the air inlet distributor is rotatable relative to the mixed combustion burner, and / or the hydrogen-oxygen manifold baffle is rotatable relative to the mixed combustion burner. According to the mixed combustion burner, the rotatable hydrogen-oxygen manifold baffle and the air inlet distributor are sequentially arranged, efficient, safe and flexible collaborative combustion of various fuels such as pulverized coal, hydrogen and oxygen-rich air is realized, the combustion stability under low load is improved, backfire and local high temperature are inhibited, the risk of slagging and NOx generation is reduced, and precise regulation and control of the combustion process under multiple working conditions are realized.

Description

Technical Field

[0001] This invention relates to the field of coal-fired power generation technology, and in particular to a co-fired burner and boiler assembly. Background Technology

[0002] Related technologies indicate that as the energy structure transformation deepens, coal-fired power is shifting from a primary power source to a basic, guaranteed, and system-regulating power source. With the increasing proportion of new energy sources, the power grid's demand for flexible resource regulation is rising sharply. Traditional burners are prone to problems such as unstable combustion, decreased efficiency, and increased pollutant emissions under low-load conditions. The core advantage of oxy-fuel combustion lies in reducing the proportion of nitrogen in the combustion air that does not participate in combustion, bringing multiple benefits: increasing flame temperature and accelerating combustion speed, thereby improving the boiler's low-load operating capacity; reducing the amount of flue gas after combustion, and thus reducing heat loss carried away by the flue gas, thereby improving combustion efficiency and thermal energy utilization. In terms of environmental protection, it not only achieves high-concentration enrichment of carbon dioxide for easy capture and storage, but also reduces the formation of nitrogen oxides (NOx).

[0003] Traditional pulverized coal combustion technology has limited adaptability to specific fuels. With the rapid development of renewable energy, the utilization of green energy sources such as hydrogen has become a new demand. Although some studies have attempted to introduce gaseous fuels such as hydrogen into boilers as combustion aids or co-firing methods, these typically employ simple coaxial injection methods, failing to achieve deep synergy and optimization with the pulverized coal combustion process. The high flame speed and high combustion intensity of hydrogen, if improperly utilized, may lead to localized overheating, exacerbating slagging and corrosion risks, or increasing NOx emissions.

[0004] With a high proportion of renewable energy being integrated into the grid, the demand for flexible regulation capabilities in the power grid has surged. However, traditional pulverized coal burners often face problems such as unstable combustion, decreased efficiency, and increased pollutant emissions under low loads. Oxygen-enriched combustion technology, by reducing the proportion of nitrogen in the combustion air, can increase flame temperature, accelerate combustion speed, and reduce flue gas volume and heat loss, thereby enhancing the boiler's low-load operating capacity and facilitating carbon dioxide enrichment and NOx emission reduction. Meanwhile, to promote the utilization of green hydrogen, hydrogen co-firing has become a research hotspot. However, existing technologies mostly employ simple coaxial injection methods, failing to achieve deep synergy between hydrogen and pulverized coal combustion. Hydrogen combustion is fast and intense; if not properly organized, it can easily lead to backfire, localized overheating, slagging corrosion, and increased NOx levels. It may also inhibit pulverized coal ignition and burnout due to preferential oxygen consumption. Summary of the Invention

[0005] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a co-combustion burner that achieves efficient, safe, and flexible synergistic combustion of multiple fuels such as pulverized coal, hydrogen, and oxygen-enriched air, improves combustion stability under low load, and suppresses backfire and localized high temperatures.

[0006] The present invention also proposes a boiler assembly with a co-fired burner.

[0007] According to a first aspect of the present invention, a mixed-combustion burner includes: an airflow passage, an intake stabilizing element, a hydrogen-oxygen manifold baffle, and an intake distributor. The intake stabilizing element, the hydrogen-oxygen manifold baffle, and the intake distributor are all disposed within the airflow passage and arranged sequentially in the airflow direction. The intake distributor is rotatable relative to the mixed-combustion burner, and / or the hydrogen-oxygen manifold baffle is rotatable relative to the mixed-combustion burner.

[0008] According to the present invention, the co-combustion burner achieves efficient, safe, and flexible co-combustion of various fuels such as pulverized coal, hydrogen, and oxygen-enriched air by sequentially setting rotatable hydrogen-oxygen manifold baffles and air inlet distributors. This improves combustion stability under low load, suppresses backfire and local high temperature, reduces the risk of slagging and NOx generation, and enables precise control of the combustion process under multiple operating conditions.

[0009] In some feasible embodiments, the hydrogen-oxygen manifold baffle includes a first intake pipe connected to at least one side of the hydrogen-oxygen manifold baffle, the hydrogen-oxygen manifold baffle having a first intake port communicating with the first intake pipe.

[0010] In some feasible embodiments, the first air inlet has multiple first air inlets arranged in an array.

[0011] In some feasible embodiments, the hydrogen-oxygen manifold baffle has a first windward side and a first leeward side, wherein the first windward side and / or the first leeward side are both formed as arc-shaped surfaces.

[0012] In some feasible embodiments, the air intake distributor includes a second air intake pipe connected to at least one side of the air intake distributor, the air intake distributor having a second air inlet communicating with the second air intake pipe.

[0013] In some feasible embodiments, the second air inlet has multiple second air inlets arranged in an array.

[0014] In some feasible embodiments, the air intake distributor has a second windward side and a second leeward side, wherein the second windward side and / or the second leeward side are formed as arc-shaped surfaces.

[0015] In some feasible embodiments, the second air inlet includes two groups, each group of which includes multiple second air inlets, and the two groups of second air inlets are arranged at intervals and have a groove formed in the middle.

[0016] In some feasible embodiments, the air intake stabilizing component includes a third air intake pipe connected to at least one side of the air intake stabilizing component, the air intake stabilizing component has a third air inlet communicating with the third air intake pipe, and the third air inlet includes multiple third air inlets arranged in an array.

[0017] According to a second aspect of the invention, a boiler assembly includes a boiler and a co-fired burner according to the first aspect of the invention described above, wherein the airflow passage of the co-fired burner is in communication with the combustion zone of the boiler.

[0018] According to the boiler assembly of the present invention, by providing the co-combustion burner of the first aspect described above, it has the same technical effect, namely, it realizes efficient, safe and flexible co-combustion of multiple fuels such as pulverized coal, hydrogen and oxygen-enriched air, improves combustion stability under low load, suppresses backfire and local high temperature, reduces the risk of slagging and NOx generation, and realizes precise control of the combustion process under multiple operating conditions.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a boiler assembly according to an embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of the hydrogen-oxygen manifold baffle shown; Figure 3 yes Figure 1 A schematic diagram of the intake distributor shown; Figure 4 yes Figure 1 A schematic diagram of the intake combustion stabilizer shown; Figure 5 yes Figure 1 A schematic diagram of the airflow of the boiler assembly shown; Figure 6 This is a schematic diagram of a boiler assembly according to another embodiment of the present invention; Figure 7 yes Figure 6 A schematic diagram of the intake distributor shown; Figure 8 yes Figure 6 The diagram shows the airflow of the boiler assembly.

[0021] Figure label: 10. Mixed-burner; 1. Airflow channel; 2. Intake and combustion stabilizer; 21. Third intake pipe; 22. Third intake port; 3. Hydrogen-oxygen manifold baffle; 31. Second shaft; 32. First intake pipe; 33. First intake port; 34. First windward side; 35. First leeward side; 4. Air intake distributor; 41. First shaft; 42. Second air intake pipe; 43. Second air intake port; 44. Second windward side; 45. Second leeward side; 46. Groove; 20. Boiler; 201. Combustion Zone; 100. Boiler Assembly; A. Pulverized coal jet inflow; B. High pulverized coal concentration zone; C. Low pulverized coal concentration zone; D. High-low pulverized coal concentration transition zone; E. Synergistic enhancement and stable combustion zone. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] The following is for reference. Figures 1-8 A mixed-burner 10 according to an embodiment of the first aspect of the present invention is described.

[0024] like Figures 1-8 As shown, the mixed-burner 10 according to a first aspect embodiment of the present invention includes: an airflow passage 1, an air intake stabilizing element 2, a hydrogen-oxygen manifold baffle 3, and an air intake distributor 4.

[0025] Specifically, the intake stabilizing element 2, the hydrogen-oxygen manifold baffle 3, and the intake distributor 4 are all located within the airflow channel 1 and arranged sequentially in the airflow direction. The intake distributor 4 is rotatable relative to the co-fired burner 10, and / or the hydrogen-oxygen manifold baffle 3 is rotatable relative to the co-fired burner 10. It can be understood that the airflow channel 1 provides an orderly flow path for multiple airflows, including pulverized coal, primary air, secondary air, hydrogen, and oxygen-enriched air, ensuring that each component airflow enters the furnace along a predetermined path and avoiding turbulent mixing. The intake stabilizing element 2 is located at the front of the airflow channel 1 and is used to form a stable recirculation zone near the burner outlet, promoting pulverized coal ignition and initial combustion. This allows for the maintenance of high-temperature recirculation flue gas even under low load or oxygen-enriched conditions, enhancing ignition and combustion stabilization capabilities. Simultaneously, it provides a stable ignition environment for subsequent hydrogen injection, preventing flame detachment or flashover due to rapid hydrogen combustion.

[0026] Furthermore, the hydrogen-oxygen manifold baffle 3 is located downstream of the intake stabilizing component 2 in the airflow direction. It is used to introduce hydrogen and oxygen-enriched air (or high-concentration oxygen), realizing the spatial separation and injection of hydrogen and oxygen-enriched medium, avoiding premature mixing inside the burner that could cause backfire or deflagration. At the same time, the hydrogen-oxygen ratio and injection direction can be adjusted by the angle or opening of the hydrogen-oxygen manifold baffle 3 to optimize the temperature distribution in the combustion zone 201 and suppress the formation of thermal NOx. The intake distributor 4 is located at the downstream end, close to the burner outlet, and is used to regulate the outlet velocity field and concentration field distribution of the main airflow (including pulverized coal, primary air, etc.). By rotating and adjusting, the outlet diffusion angle, swirl intensity, and intersection position with the hydrogen / oxygen jet can be changed, thereby adapting to different loads, fuel ratios, or operating modes (such as pure coal, hydrogen blending, oxygen enrichment, etc.) and improving combustion efficiency and flexibility.

[0027] For example, the hydrogen-oxygen manifold baffle 3 can be rotatable; another example is that the air intake distributor 4 can be rotatable; yet another example is that both the hydrogen-oxygen manifold baffle 3 and the air intake distributor 4 can be rotatable. This further enhances the active control capability of the hydrogen and oxygen-enriched jet direction, enabling it to adjust the injection angle in real time according to the combustion state, achieving optimal coupling with the pulverized coal flame, avoiding local overheating, ensuring that hydrogen fully participates in the combustion reaction, and improving energy utilization.

[0028] According to an embodiment of the present invention, the co-combustion burner 10, by sequentially arranging a rotatable hydrogen-oxygen manifold baffle 3 and an air inlet distributor 4, achieves efficient, safe, and flexible co-combustion of various fuels such as pulverized coal, hydrogen, and oxygen-enriched air, improves combustion stability under low load, suppresses backfire and local high temperature, reduces the risk of slagging and NOx generation, and achieves precise control of the combustion process under multiple operating conditions.

[0029] It should be noted that the intake distributor 4 is rotatable relative to the co-combustion burner 10 via the first shaft 41, and the hydrogen-oxygen manifold baffle 3 is rotatable relative to the co-combustion burner 10 via the second shaft 31.

[0030] In some embodiments of the present invention, the hydrogen-oxygen manifold baffle 3 includes a first inlet pipe 32, which is connected to at least one side of the hydrogen-oxygen manifold baffle 3. The hydrogen-oxygen manifold baffle 3 has a first inlet port 33, which communicates with the first inlet pipe 32. It is understood that the first inlet pipe 32 is a gas supply pipe connecting an external gas source (such as a hydrogen storage tank or an oxygen enrichment generator) to the hydrogen-oxygen manifold baffle 3, and is fixedly connected to at least one side of the hydrogen-oxygen manifold baffle 3. Preferably, the first inlet pipe 32 is connected to both sides of the hydrogen-oxygen manifold baffle 3.

[0031] like Figure 2As shown, the first air inlet 33 is formed on the hydrogen-oxygen manifold baffle 3 and communicates with the inside of the first air inlet pipe 32. It is used to guide the input gas into the airflow channel 1, realizing the controlled release of hydrogen or oxygen-enriched air from the inside of the baffle to the main combustion zone 201, avoiding direct impact on the coal powder flow or accumulation in dead corners.

[0032] Furthermore, the first air inlet 33 has multiple inlets arranged in an array. This avoids the high-speed concentrated jet caused by a single large orifice, reduces disturbance and impact on the pulverized coal flow, disperses the gas supply to reduce local gas concentration, effectively suppresses the risk of backfire and deflagration, and multi-point injection helps to form a wider reaction zone, prolongs the combustion residence time, and improves the burnout rate.

[0033] In some embodiments of the present invention, the hydrogen-oxygen manifold baffle 3 is formed with a first windward surface 34 and a first leeward surface 35, both of which are arc-shaped surfaces. It is understood that the first windward surface 34 is the surface of the hydrogen-oxygen manifold baffle 3 facing the incoming flow direction, such as... Figure 1 , Figure 2 and Figure 5 As shown, the first windward surface 34 forms an arc-shaped surface, which allows the high-speed pulverized coal airflow to smoothly adhere to and flow around it, reducing flow resistance and turbulence intensity, avoiding the strong impact and backflow zone caused by traditional planar baffles, thereby reducing the accumulation of pulverized coal at the front edge of the baffle, preventing blockage or local high-temperature slagging, and also helping to maintain the momentum integrity of the main airflow, providing a more stable flow field basis for the downstream air inlet distributor 4 and flame formation.

[0034] like Figure 1 , Figure 2 and Figure 5 As shown, the first leeward surface 35 is the surface of the hydrogen-oxygen manifold baffle 3 facing away from the incoming flow direction. The first leeward surface 35 forms an arc-shaped surface. The first leeward surface 35 can guide the hydrogen or oxygen-enriched air ejected from the first air inlet 33 to blend more smoothly into the mainstream, avoiding gas stagnation or uneven mixing caused by sudden expansion or dead angles. It reduces the size and intensity of the vortex zone on the leeward side, suppresses the formation of local reducing atmosphere, and reduces the tendency of high-temperature corrosion and coking.

[0035] In some embodiments of the present invention, the air intake distributor 4 includes a second air intake pipe 42, which is connected to at least one side of the air intake distributor 4. The air intake distributor 4 has a second air inlet 43, which communicates with the second air intake pipe 42. It is understood that the second air intake pipe 42 is an air supply pipe connecting an external air source (such as oxygen-enriched air, secondary air, or flue gas recirculation air) to the air intake distributor 4, and is fixedly connected to at least one side of the air intake distributor 4. Preferably, the second air intake pipe 42 is connected to both sides of the air intake distributor 4. like Figure 1 , Figure 3 , Figures 5-8 As shown, the second air inlet 43 is formed on the air inlet distributor 4 and is connected to the inside of the second air inlet pipe 42. It is used to inject auxiliary gas into the main airflow as needed or directly into the combustion zone 201, avoiding premature mixing with the main coal powder flow upstream, and realizing precise positioning and injection of auxiliary gas near the burner outlet.

[0036] Furthermore, there are multiple second air inlets 43 arranged in an array. This avoids the concentrated high-speed jet caused by a single large orifice, reduces disturbance and deflection to the main pulverized coal flow, and the multi-point air supply forms a wider and more continuous reaction interface, promoting the later-stage combustion of pulverized coal. The dispersed injection reduces the local oxygen concentration peak and effectively alleviates the NOx surge problem caused by oxygen enrichment.

[0037] In some embodiments of the present invention, the air intake distributor 4 is formed such that the second windward surface 44 and / or the second leeward surface 45 are formed as arcuate surfaces. It is understood that the second windward surface 44 is the surface of the air intake distributor 4 facing the incoming flow direction, such as... Figure 7 and Figure 8 As shown, the second windward surface 44 is formed into an arc shape, which allows the high-speed coal powder airflow to smoothly adhere to and flow around it, reducing flow resistance and turbulence intensity, avoiding the strong impact and backflow zone caused by traditional planar baffles, thereby reducing the accumulation of coal powder at the front edge of the baffle.

[0038] Furthermore, the second leeward surface 45 is the surface of the intake distributor 4 facing away from the incoming flow and towards the combustion zone 201, such as... Figure 3 As shown, the second leeward side 45 forms an arc-shaped surface.

[0039] In some embodiments of the present invention, such as Figure 7 As shown, the second air inlet 43 includes two sets, each set containing multiple inlets 43. The two sets of second air inlets 43 are arranged alternately with a groove 46 in between. This enables the partitioned and staged injection of auxiliary gas to meet the needs of different combustion stages. The groove 46 is used to form a local low-speed recirculation zone, which enhances the ignition and stable combustion of pulverized coal, improves the uniformity of gas-solid two-phase flow, reduces flow deviation and wall erosion, and enhances the adaptability and control flexibility for complex operating conditions such as hydrogen doping and oxygen enrichment.

[0040] In some embodiments of the present invention, the air intake stabilizing component 2 includes a third air intake pipe 21 connected to at least one side of the air intake stabilizing component 2. The air intake stabilizing component 2 has a third air inlet 22 connected to the third air intake pipe 21. Multiple third air inlets 22 are arranged in an array. It is understood that, preferably, the third air intake pipe 21 is connected to both sides of the air intake stabilizing component 2, and the third air inlets 22 are formed on the air intake stabilizing component 2 and communicate with the interior of the third air intake pipe 21. These third air inlets are used to directionally inject auxiliary gas into the initial section or recirculation zone of the main airflow. The array arrangement of multiple third air inlets 22 avoids localized hydrogen / oxygen enrichment caused by a single-hole high-speed jet, effectively suppressing backfire and the formation of thermal NOx.

[0041] According to a second aspect of the present invention, a boiler assembly 100 includes a boiler 20 and a co-fired burner 10 according to the first aspect of the present invention, wherein the airflow passage 1 of the co-fired burner 10 is connected to the combustion zone 201 of the boiler 20.

[0042] The boiler assembly 100 according to an embodiment of the present invention, by providing the co-combustion burner 10 of the first aspect embodiment, thus has the same technical effect, namely, it realizes efficient, safe and flexible co-combustion of multiple fuels such as pulverized coal, hydrogen and oxygen-enriched air, improves combustion stability under low load, suppresses backfire and local high temperature, reduces the risk of slagging and NOx generation, and realizes precise control of the combustion process under multiple operating conditions.

[0043] The following will refer to Figures 1-8 A mixed-burner 10 according to two specific embodiments of the present invention is described.

[0044] Example 1, Reference Figures 1-5 The hydrogen-oxygen manifold baffle 3 has four baffles 3 arranged in the vertical direction. The coal powder jet A contacts the four hydrogen-oxygen manifold baffles 3 first. The air intake distributor 4 includes two air intake distributors 4 arranged in the vertical direction. The air intake distributor 4 is formed into an airfoil shape.

[0045] Specifically, such as Figures 1-5 As shown, the mixed-combustion burner 10 can achieve a wide range of coal powder concentration separation when using air-assisted combustion alone. The upper part is a high coal powder concentration zone B, and the lower part is a low coal powder concentration zone C. A high-low coal powder concentration transition zone D is formed between the high coal powder concentration zone B and the low coal powder concentration zone C. The high coal powder concentration jet flows through the air-blade air inlet distributor 4, forming a strong backflow zone of highly concentrated coal powder behind it. The position of the backflow zone can be adjusted within a certain range by adjusting the deflection angle of the air-blade air inlet distributor 4, thereby establishing a stable flame, significantly improving the low-load stable combustion performance and reducing NOx emissions.

[0046] This mixed-combustion burner 10, based on air-assisted combustion, introduces localized oxygen-enriched and hydrogen-assisted ignition technology. The pulverized coal and air mixed jet is... Figure 1 High-purity oxygen / hydrogen enters the burner through the first inlet 33 and the second inlet 43, with a slightly higher oxygen flow rate and a lower hydrogen flow rate. The hydrogen flow rate is adjusted according to load requirements, but should not be excessive to avoid hydrogen backfire or competition for oxygen with pulverized coal. That is, thanks to the action of the hydrogen-oxygen manifold baffle 3 and the wing-shaped air intake distributor 4, high concentrations of oxygen and hydrogen are delivered into the system and enriched in the high-concentration pulverized coal zone B. In this zone, the strong recirculation zone formed behind the wing-shaped air intake distributor 4 accumulates the highest concentrations of pulverized coal, hydrogen, and oxygen. This synergistic effect of the above technologies allows the strong recirculation zone to simultaneously possess high pulverized coal concentration, high oxygen concentration, and high flammable gas concentration. This highly active synergistic combustion stabilization zone greatly enhances the ignition and combustion stabilization process, ensuring flame stability under ultra-low load conditions.

[0047] The co-fired burner 10 is used in conjunction with the flue gas recirculation and carbon capture system to achieve global "oxygen-enriched combustion". In the global oxygen-enriched combustion condition, oxygen is injected through the hydrogen-oxygen manifold baffle 3 and the air wing intake distributor 4 to increase the local oxygen concentration to stabilize ultra-low load combustion, and appropriately reduce the oxygen concentration in the main jet of pulverized coal. The reduction of the oxygen concentration in the main jet can reduce operating costs on the one hand, and reduce NOx emissions to a lower level on the other hand.

[0048] This co-fired burner 10 is used in conjunction with a flue gas recirculation and carbon capture system. Based on global oxygen-enriched combustion, it injects combustion-supporting hydrogen / natural gas through a triangular stabilizing inlet bluff body in the low-concentration pulverized coal zone. Because the nitrogen content and pulverized coal content are extremely low in the rear region of the triangular stabilizing inlet bluff body, the generation of both fuel-type NOx and thermal NOx is low. Furthermore, the large amount of heat generated by the combustion of hydrogen / natural gas and oxygen stabilizes combustion at low loads. Additionally, the flammability and high calorific value of hydrogen / natural gas stabilize combustion in the low pulverized coal concentration zone C. The hydrogen nozzle is generally located in the middle region of the nozzle assembly to avoid contact with the high-concentration pulverized coal zone and to prevent coking and high-temperature corrosion caused by the heat generated during combustion. The hydrogen nozzle diameter should be relatively small, and the air velocity should be relatively high to reduce the probability of backfire.

[0049] Example 2, like Figure 2 , Figure 4 , Figures 6-8 As shown, the structure of this embodiment is roughly the same as that of embodiment one, with the same reference numerals used for the same components. The only difference is that the air intake distributor 4 in embodiment one is shaped like an airfoil, while the air intake distributor 4 in this embodiment two is shaped like a fish head.

[0050] Reference Figure 2 , Figure 4 , Figures 6-8 When the mixed-fuel burner 10 is operated with air as the sole combustion aid, all hydrogen / oxygen inlets are closed, and the coal powder and air mixture flow is as follows: Figure 6 The coal powder jet enters the burner in the direction shown (coal powder jet inflow A), enabling wide-range adjustment of coal powder concentration and separation. The upper part is a high coal powder concentration zone B, and the lower part is a low coal powder concentration zone C. A high-low coal powder concentration transition zone D is formed between the high coal powder concentration zone B and the low coal powder concentration zone C. The high coal powder concentration jet flows through the fish-head shaped air inlet distributor 4, forming a strong backflow zone of highly concentrated coal powder behind it. The position of the backflow zone can be adjusted within a certain range by adjusting the deflection angle of the fish-head shaped air inlet distributor 4, thereby establishing a stable flame, significantly improving the low-load stable combustion performance and reducing NOx emissions.

[0051] This mixed-combustion burner 10, based on air-assisted combustion, introduces localized oxygen-enriched and hydrogen-assisted ignition technology. The coal powder and air mixture flow is... Figure 1 High-purity oxygen / hydrogen enters the burner in the direction shown. It enters through the first inlet 33 and the second inlet 43. Under this condition, the oxygen flow rate is slightly higher, while the hydrogen flow rate is lower. The flow rate of combustion-supporting hydrogen is appropriately increased according to load requirements. That is, thanks to the action of the hydrogen-oxygen manifold baffle 3 and the fish-head-shaped air distributor 4, high concentrations of oxygen and hydrogen are delivered into the system and enriched in the high-concentration pulverized coal zone. In this zone, the strong recirculation zone formed behind the fish-head-shaped air distributor 4 accumulates the highest concentrations of pulverized coal, hydrogen, and oxygen. The synergistic effect of these technologies allows the strong recirculation zone to simultaneously possess high pulverized coal concentration, high oxygen concentration, and high flammable gas concentration. This synergistic enhancement of the stable combustion zone E greatly strengthens the ignition and stable combustion process, ensuring flame stability under ultra-low load conditions.

[0052] The co-fired burner 10 is used in conjunction with the flue gas recirculation and carbon capture system to achieve global "oxygen-enriched combustion". In the global oxygen-enriched combustion condition, oxygen is injected through the hydrogen-oxygen manifold baffle 3 and the fish-head-shaped air inlet distributor 4 to increase the local oxygen concentration to stabilize ultra-low load combustion and appropriately reduce the oxygen concentration in the main jet of pulverized coal. The reduction of the oxygen concentration in the main jet can reduce operating costs on the one hand, and reduce NOx emissions to a lower level on the other hand.

[0053] This co-fired burner 10 is used in conjunction with a flue gas recirculation and carbon capture system. Based on global oxygen-enriched combustion, it injects combustion-supporting hydrogen / natural gas into the low-concentration pulverized coal zone through the inlet of a triangular stabilizing inlet bluff body. The combustion-supporting hydrogen / natural gas is positioned in the middle of the inlet bluff body, achieving separation from the concentrated pulverized coal zone and preventing excessive heat generation during combustion from promoting coking on the coal wall. A higher injection velocity can be set to avoid hydrogen combustion backfire. Because the nitrogen content and pulverized coal content are extremely low in the rear region of the triangular stabilizing inlet bluff body, the generation of both fuel-type NOx and thermal NOx is low, and the large amount of heat generated by the combustion of hydrogen / natural gas and oxygen can stabilize low-load combustion. Furthermore, the flammability and high calorific value of hydrogen / natural gas stabilize combustion in the low pulverized coal concentration zone C. In addition, after two-stage concentration separation, the pulverized coal particle concentration in this region is low, and the impact of hydrogen combustion on pulverized coal particles is minimal.

[0054] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0056] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0058] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A mixed-combustion burner (10), characterized in that, include: The system comprises an airflow channel (1), an intake combustion stabilizer (2), a hydrogen-oxygen manifold baffle (3), and an intake distributor (4). The intake combustion stabilizer (2), the hydrogen-oxygen manifold baffle (3), and the intake distributor (4) are all located within the airflow channel (1) and are arranged sequentially in the airflow direction. The intake distributor (4) is rotatable relative to the co-combustion burner (10). And / or, the hydrogen-oxygen manifold baffle (3) is rotatable relative to the co-combustion burner (10).

2. The mixed-combustion burner (10) according to claim 1, characterized in that, The hydrogen-oxygen manifold baffle (3) includes a first intake pipe (32), which is connected to at least one side of the hydrogen-oxygen manifold baffle (3). The hydrogen-oxygen manifold baffle (3) has a first intake port (33), which is connected to the first intake pipe (32).

3. The mixed-combustion burner (10) according to claim 2, characterized in that, The first air inlet (33) has multiple first air inlets (33) arranged in an array.

4. The mixed-combustion burner (10) according to claim 3, characterized in that, The hydrogen-oxygen manifold baffle (3) has a first windward surface (34) and a first leeward surface (35), and the first windward surface (34) and / or the first leeward surface (35) are both formed as arc-shaped surfaces.

5. The mixed-burner (10) according to claim 1, characterized in that, The air intake distributor (4) includes a second air intake pipe (42) connected to at least one side of the air intake distributor (4), and the air intake distributor (4) has a second air intake port (43) connected to the second air intake pipe (42).

6. The mixed-combustion burner (10) according to claim 5, characterized in that, The second air inlet (43) has multiple inlets, and the multiple second air inlets (43) are arranged in an array.

7. The mixed-burner (10) according to claim 6, characterized in that, The air intake distributor (4) has a second windward surface (44) and a second leeward surface (45), wherein the second windward surface (44) and / or the second leeward surface (45) are formed as arc-shaped surfaces.

8. The mixed-combustion burner (10) according to claim 7, characterized in that, The second air inlet (43) includes two groups, each group of the second air inlet (43) includes multiple groups, the two groups of the second air inlet (43) are arranged apart and a groove (46) is formed in the middle.

9. The mixed-burner (10) according to any one of claims 1-8, characterized in that, The air intake stabilizing component (2) includes a third air intake pipe (21), which is connected to at least one side of the air intake stabilizing component (2). The air intake stabilizing component (2) has a third air inlet (22), which is connected to the third air intake pipe (21). The third air inlet (22) includes multiple third air inlets, which are arranged in an array.

10. A boiler assembly (100), characterized in that, include: The boiler (20) and the mixed-burner (10) according to any one of claims 1-9, wherein the airflow passage (1) of the mixed-burner (10) is connected to the combustion zone (201) of the boiler (20).

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