Hydrogen-coal mixed combustion device, control method of hydrogen-coal mixed combustion device, and related equipment

Abstract

This application discloses a hydrogen-coal co-combustion device, a control method for the hydrogen-coal co-combustion device, and related equipment, relating to the field of coal-fired boiler combustion technology. Specifically, the nozzle of a first hydrogen injection assembly is radially positioned inside a swirling secondary air channel and axially adjacent to the outlet end of a primary air channel, injecting first hydrogen into the region between the root of the pulverized coal gas flow ejected from the primary air channel and the swirling secondary air. The nozzle of a second hydrogen injection assembly is radially positioned between the swirling secondary air channel and the direct-flow secondary air channel in the hydrogen-coal co-combustion device, and axially positioned closer to the outlet end of the hydrogen-coal co-combustion device than the nozzle of the first hydrogen injection assembly, for injecting second hydrogen. According to this application, pulverized coal particles can continuously obtain the heat and oxygen required for ignition, improving the ignition stability and sustained combustion capability of the pulverized coal gas flow under low-load conditions.

Description

Technical Field

[0001] This application relates to the field of coal-fired boiler combustion technology, and more specifically, to a hydrogen-coal co-combustion device, a control method for the hydrogen-coal co-combustion device, and related equipment. Background Technology

[0002] Under low-load conditions, the amount of pulverized coal entering the furnace of coal-fired power generating units decreases, resulting in a corresponding reduction in the heat released from pulverized coal combustion. This makes it difficult to maintain stable ignition and continuous combustion of the pulverized coal airflow, easily leading to problems such as delayed ignition, decreased flame stability, or even flameout. Simultaneously, nitrogen oxides are produced during pulverized coal combustion, and uneven distribution of local temperature, oxygen levels, and fuel within the furnace further increases the difficulty of controlling nitrogen oxide emissions.

[0003] To improve the low-load combustion performance of coal-fired power units, hydrogen can be incorporated into the pulverized coal combustion process. Taking advantage of hydrogen's characteristics—no carbon emissions during combustion, low ignition energy requirements, and fast combustion reaction rate—mixing it with pulverized coal for co-combustion restructures the fuel composition within the furnace, providing a feasible technical approach to enhance the low-load ignition stability of coal-fired power units.

[0004] However, the incorporation of hydrogen simultaneously affects pulverized coal ignition, flame temperature, local oxygen concentration, pulverized coal burnout, and nitrogen oxide formation, with strong coupling relationships among these various influencing factors. Existing hydrogen-coal co-firing technologies rely solely on the advantages of hydrogen to optimize basic combustion conditions, failing to systematically and synergistically regulate the aforementioned mutually constraining combustion processes. This ultimately affects the combustion stability of the entire co-firing equipment under low loads, leading to difficulties in achieving ideal pollutant emission control levels. Summary of the Invention

[0005] In view of the above problems, this application is made to provide a hydrogen-coal co-firing device, a control method for the hydrogen-coal co-firing device, and related equipment to improve combustion stability and pollutant emission control levels. The specific solution is as follows:

[0006] In a first aspect, this application provides a hydrogen-coal co-combustion device, comprising: a primary air channel, a swirl secondary air channel, a first hydrogen injection assembly, a direct current secondary air channel, and a second hydrogen injection assembly;

[0007] The primary air duct extends along the axial direction of the hydrogen-coal co-firing device and is located on the radial inner side of the hydrogen-coal co-firing device, for conveying a coal powder airflow carrying coal powder in the direction toward the outlet end of the hydrogen-coal co-firing device.

[0008] The swirling secondary air channel is arranged around the primary air channel and is used to output swirling secondary air rotating around the axis of the hydrogen-coal co-combustion device at the outer periphery of the pulverized coal airflow.

[0009] The nozzle of the first hydrogen injection assembly is located radially inside the swirl secondary air channel of the hydrogen-coal co-firing device, and axially adjacent to the outlet end of the primary air channel of the hydrogen-coal co-firing device, for injecting first hydrogen into the area between the root of the pulverized coal airflow and the swirl secondary air.

[0010] The DC secondary air channel is arranged around the swirl secondary air channel and is used to output DC secondary air along the axial direction of the hydrogen-coal co-combustion device on the outer periphery of the swirl secondary air.

[0011] The nozzle of the second hydrogen injection assembly is located radially in the hydrogen-coal co-firing device, between the swirl secondary air channel and the direct current secondary air channel. Furthermore, the nozzle of the second hydrogen injection assembly is located axially in the hydrogen-coal co-firing device, closer to the outlet end of the hydrogen-coal co-firing device than the nozzle of the first hydrogen injection assembly, and is used to inject second hydrogen.

[0012] In one possible implementation, in another implementation of the first aspect of the present application, a primary air nozzle is formed at one end of the primary air passage facing the outlet end of the hydrogen-coal co-firing device, and the nozzle of the first hydrogen injection assembly and the primary air nozzle are located in the same radial section perpendicular to the axial direction of the hydrogen-coal co-firing device.

[0013] In one possible implementation, in another implementation of the first aspect of the present application, the first hydrogen injection assembly includes a plurality of first hydrogen nozzles, which are distributed circumferentially at intervals along the primary air channel, and one end of all the first hydrogen nozzles facing the outlet end of the hydrogen-coal co-firing device forms the nozzle of the first hydrogen injection assembly.

[0014] In one possible implementation, in another implementation of the first aspect of the present application, the second hydrogen injection assembly includes a plurality of second hydrogen nozzles, which are circumferentially spaced along the swirl secondary air channel, and one end of all the second hydrogen nozzles facing the outlet end of the hydrogen-coal co-firing device forms the nozzle of the second hydrogen injection assembly.

[0015] In one possible implementation, in another implementation of the first aspect of the embodiments of this application, swirl blades are provided in the swirl secondary air channel to form swirl secondary air flowing through the swirl secondary air channel.

[0016] Secondly, this application provides a control method for a hydrogen-coal co-firing device, applied to a hydrogen-coal co-firing device including a primary air channel, a swirl secondary air channel, and a first hydrogen injection assembly, the control method comprising:

[0017] Obtain the unit load of the coal-fired power unit, and determine the target hydrogen blending amount based on the unit load;

[0018] According to the preset allocation relationship, the target hydrogen blending amount is allocated as the first hydrogen supply amount and the second hydrogen supply amount;

[0019] The primary air channel is controlled to output a coal powder airflow carrying coal powder, the swirling secondary air channel is controlled to output swirling secondary air around the coal powder airflow, and the first hydrogen injection assembly is controlled to inject first hydrogen according to the first hydrogen supply amount.

[0020] According to the second hydrogen supply, the second hydrogen injection assembly is controlled to inject second hydrogen downstream of the first hydrogen injection position, and the DC secondary air channel is controlled to output DC secondary air at the outer periphery of the swirling secondary air.

[0021] In one possible implementation, in another embodiment of the second aspect of the present application, the method further includes:

[0022] The nitrogen oxide concentration at the outlet side of the hydrogen-coal co-combustion device is obtained, and the second hydrogen supply and the DC secondary air supply are adjusted according to the deviation between the nitrogen oxide concentration and the target nitrogen oxide concentration.

[0023] Thirdly, this application provides an electronic device, including: a memory and a processor;

[0024] The memory is used to store programs;

[0025] The processor is used to execute the program to implement the control method of the hydrogen-coal co-fired device described in any of the second aspects of this application.

[0026] Fourthly, this application provides a readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the control method for the hydrogen-coal co-combustion device described in any of the preceding second aspects of this application.

[0027] Fifthly, this application provides a computer program product, including a computer program that, when executed by a processor, implements the control method for the hydrogen-coal co-firing device described in any of the preceding second aspects of this application.

[0028] By means of the above technical solution, the hydrogen-coal co-combustion device provided in this application has a primary air channel that extends axially along the device and is located radially inward, allowing the coal powder-carrying gas flow to be transported along the central area of ​​the device towards the outlet end, thereby forming a relatively concentrated coal powder gas flow near the outlet of the primary air channel. The nozzle of the first hydrogen injection assembly is radially located inside the swirling secondary air channel and axially adjacent to the outlet end of the primary air channel, allowing the first hydrogen to be directly injected into the area between the root of the coal powder gas flow and the swirling secondary air. Since hydrogen is more flammable than coal powder, the injected first hydrogen can burn first near the root of the coal powder gas flow, and the heat released by its combustion and the high-temperature flue gas formed can be transferred to the coal powder gas flow nearby, thereby increasing the temperature at the root of the coal powder gas flow and promoting the ignition of the coal powder.

[0029] Meanwhile, because the swirling secondary air channel is set around the primary air channel, the swirling secondary air can rotate and flow around the pulverized coal airflow. It generates shearing, disturbance and entrainment effects on the pulverized coal airflow from the periphery, which enhances the mixing of the first hydrogen, the pulverized coal airflow and the high-temperature combustion gas. It also rolls the high-temperature flue gas formed by the combustion of the first hydrogen back to the root of the pulverized coal airflow, so that the pulverized coal particles can continuously obtain the heat and oxygen required for ignition. This shortens the ignition delay of pulverized coal and improves the ignition stability and continuous combustion capability of the pulverized coal airflow under low load conditions.

[0030] Furthermore, the second hydrogen injection assembly is positioned between the swirling secondary air channel and the direct-flow secondary air channel, with its nozzle axially downstream of the nozzle of the first hydrogen injection assembly. This allows the second hydrogen to bypass the concentrated ignition zone at the root of the pulverized coal flow, creating a reducing atmosphere in the downstream region after initial ignition and low-oxygen combustion. The reducing effect of the second hydrogen further reduces the nitrogen oxides already generated during pulverized coal combustion. Simultaneously, the direct-flow secondary air channel surrounds the swirling secondary air channel, allowing it to be axially transported downstream from the outer periphery of the combustion zone. This reduces the premature entry of oxygen into the reducing zone formed by the second hydrogen, which weakens the reducing effect. Further downstream, it gradually mixes with the incompletely combusted pulverized coal flow, supplementing oxygen for subsequent combustion and promoting complete combustion of remaining pulverized coal and other combustible components. Thus, through the staged arrangement of the first hydrogen, the second hydrogen, the swirling secondary air, and the direct-flow secondary air, synergistic regulation is achieved between stable pulverized coal combustion, nitrogen oxide generation inhibition, reduction of generated nitrogen oxides, and subsequent pulverized coal combustion. Attached Figure Description

[0031] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0032] Figure 1 This is a schematic diagram of the outer structure of the hydrogen-coal co-firing device provided in the embodiments of this application;

[0033] Figure 2 This is a schematic diagram of the inner cross-section of the hydrogen-coal co-firing device provided in the embodiments of this application;

[0034] Figure 3 A schematic flowchart illustrating a control method for a hydrogen-coal co-combustion device provided in this application embodiment;

[0035] Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0036] Figure label:

[0037] 10 - Primary air duct; 20 - First hydrogen nozzle; 30 - Second hydrogen nozzle; 40 - Swirl secondary air duct; 50 - Direct current secondary air duct; 60 - Primary air nozzle; 70 - Mixing nozzle; 80 - Burner nozzle; 90 - Swirl blade; 100 - Boiler. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] This application relates to the technical fields of combustion control and pollutant emission control of coal-fired boilers, and can be applied to combustion systems that use pulverized coal as the main fuel, such as coal-fired power generation units and industrial coal-fired boilers. It is suitable for application scenarios such as coal-fired units participating in deep peak shaving, low-load operation, and boiler startup.

[0040] In the aforementioned scenarios, as the unit load decreases, the amount of pulverized coal entering the furnace decreases accordingly, leading to a reduction in the heat released from pulverized coal combustion. The pulverized coal preparation and conveying system may also gradually deviate from its design operating conditions, resulting in a decrease in pulverized coal gas flow temperature, a prolonged ignition time, and difficulty in maintaining a stable flame. In severe cases, combustion fluctuations and partial flameouts may occur, limiting the low-load operating capacity of coal-fired units. Furthermore, during pulverized coal combustion, it is also necessary to consider requirements such as pulverized coal burnout, nitrogen oxide emissions, and the long-term operational safety of the burner.

[0041] In existing coal-fired boilers, primary air carrying pulverized coal is typically introduced into the furnace, and secondary air is introduced around the pulverized coal flow. The mixing of primary and secondary air provides oxygen for pulverized coal combustion. Under low-load conditions, to improve the ignition and stable combustion performance of pulverized coal, hydrogen can be incorporated into the combustion process. Taking advantage of hydrogen's lower ignition energy requirement, faster combustion reaction rate, and higher heat release, hydrogen ignites before the pulverized coal, and the heat generated by hydrogen combustion assists in the heating and ignition of the pulverized coal. Therefore, hydrogen-coal co-firing has become a feasible technical approach to improve the combustion stability of coal-fired units under low loads and reduce carbon emissions per unit of electricity generated.

[0042] However, the incorporation of hydrogen has a multiplicity effect on the ignition process of pulverized coal, simultaneously altering flame temperature, oxygen concentration, fuel distribution, pulverized coal burnout process, and the conditions for nitrogen oxide formation and reduction within the combustion zone. If hydrogen is directly incorporated into the pulverized coal gas stream or supplied in a concentrated manner at a single location, it may burn rapidly in localized areas, consuming oxygen in a concentrated manner, resulting in an unreasonable local heat load or oxygen distribution. On the one hand, the heat and high-temperature flue gas generated by hydrogen cannot continuously and effectively act on the root of the pulverized coal gas stream, limiting the stable combustion effect under low loads; on the other hand, it is difficult to achieve coordinated combustion conditions for pulverized coal ignition, low-oxygen combustion, nitrogen oxide reduction, and subsequent pulverized coal burnout. Therefore, the above methods cannot simultaneously achieve stable combustion under low loads, nitrogen oxide emission control, and complete pulverized coal burnout, affecting the combustion stability and clean combustion effect of the hydrogen-coal co-fired system.

[0043] Based on the actual needs in the above application scenarios and the shortcomings of existing technologies, this application provides a hydrogen-coal co-firing device and a control method for the hydrogen-coal co-firing device. The following is a detailed description of the hydrogen-coal co-firing device and the control method for the hydrogen-coal co-firing device according to the embodiments of this application, with reference to the accompanying drawings.

[0044] See Figure 1 and Figure 2 This application provides a schematic diagram of a hydrogen-coal co-combustion device. The device can be installed at the furnace inlet of a boiler 100, with its outlet facing the interior of the furnace. It is used to introduce pulverized coal gas, hydrogen, and combustion air into the furnace according to a preset spatial position, and to organize a corresponding hydrogen-coal co-combustion zone at the burner outlet side. In this embodiment, the direction from the end furthest from the boiler 100 towards the outlet end of the hydrogen-coal co-combustion device can be defined as the axial direction X, and the direction perpendicular to the axial direction X can be defined as the radial direction Y.

[0045] The hydrogen-coal co-firing device may include: a primary air channel 10, a swirl secondary air channel 40, a first hydrogen injection assembly, a direct current secondary air channel 50, and a second hydrogen injection assembly 40.

[0046] The primary air duct 10 extends axially along the hydrogen-coal co-firing device and is located radially inside the device. It is used to convey a coal-powder-laden airflow towards the outlet of the device. Specifically, a primary air nozzle 60 is formed at the end of the primary air duct 10 facing the boiler 100. The primary air carrying coal-powder is conveyed by the primary air duct 10 and ejected from the primary air nozzle 60 towards the outlet of the hydrogen-coal co-firing device, thereby forming a coal-powder airflow that enters the boiler 100 axially in the central region of the device. It can be understood that the primary air duct 10, through its radially built-in arrangement, concentrates the coal-powder airflow in the central region of the hydrogen-coal co-firing device, providing a spatial basis for the subsequent organization of hydrogen and secondary air around this coal-powder airflow.

[0047] The swirl secondary air channel 40 is arranged around the primary air channel 10, so that the primary air channel 10 and the swirl secondary air channel 40 form an inner-outer distribution relationship in the radial direction. It is used to output swirl secondary air rotating around the axis of the hydrogen-coal co-combustion device at the outer periphery of the pulverized coal airflow. This swirl secondary air does not just flow straight along the axial direction, but rotates around the pulverized coal airflow while moving into the boiler 100, thus generating shearing, disturbance and entrainment effects on the pulverized coal airflow from the outer periphery.

[0048] In one possible implementation, swirl blades 90 can be installed within the swirl secondary air channel 40 to create swirl secondary air flowing through it. The swirl blades 90 can be arranged circumferentially along the swirl secondary air channel 40, with their blade surfaces inclined relative to the axial direction of the hydrogen-coal co-firing device. When the secondary air flows through the swirl blades 90, the blades guide the airflow, allowing it to maintain its axial flow component while acquiring a velocity component moving circumferentially around the device. This creates a swirl secondary airflow rotating around the device axis around the outer periphery of the pulverized coal airflow output from the primary air channel 10.

[0049] It is understandable that the rotation angle of the swirl blades determines the rotation intensity and axial conveying capacity of the swirl secondary air. In the embodiments of this application, the rotation angle of the swirl blades can be set according to the actual working conditions. For example, it can be set to the end or middle value of the 30° to 60° range, such as 30°, 50°, etc.

[0050] In addition to setting the swirl blades 90, other possible implementations can also be achieved by setting a tangential air inlet on the inlet side of the swirl secondary air channel 40, setting a spiral guide structure in the channel, or making the swirl secondary air channel 40 form a circumferentially inclined guide channel, so that the secondary air entering the channel can obtain a circumferential velocity component, thereby forming a swirl secondary air rotating around the axis of the hydrogen-coal co-combustion device.

[0051] In one possible implementation, refer to Figure 2The hydrogen-coal co-fired device may further include a mixing nozzle 70 and a burner nozzle 80, which are radially extended outwards towards the outlet end of the hydrogen-coal co-fired device. The mixing nozzle 70 may be an intermediate nozzle structure located radially outside the primary air nozzle 60, and the burner nozzle 80 may be an outer nozzle structure of the hydrogen-coal co-fired device facing the furnace end of the boiler 100. In this embodiment, the radial extension angle can be understood as the angle between the expansion guide surface of the mixing nozzle 70 or the burner nozzle 80 and the axial direction of the hydrogen-coal co-fired device, and this radial extension angle can be set to 20°–50°. Through the aforementioned flared structure, the secondary air flowing through the outlet area can be guided, causing the secondary air to maintain axial flow while exhibiting a radially outward expansion flow tendency. This, combined with the circumferential rotation formed by the swirl blades 90, adjusts the flow direction and radial diffusion degree of the secondary air, thereby optimizing the flow field organization on the burner outlet side and promoting the formation of high-temperature flue gas entrainment and combustion flame recirculation zones. This allows for a longer mixing and residence process of the first hydrogen gas, pulverized coal gas flow, and high-temperature flue gas near the burner outlet, enabling the high-temperature flue gas to flow back more fully to the root of the pulverized coal gas flow, thereby strengthening pulverized coal ignition and improving flame stability.

[0052] The first hydrogen injection assembly is used to inject first hydrogen. The nozzle of the first hydrogen injection assembly is located radially inside the swirl secondary air channel 40 of the hydrogen-coal co-fired device, and axially adjacent to the outlet end of the primary air channel 10 of the hydrogen-coal co-fired device. That is, the injection position of the first hydrogen is located in the region between the central pulverized coal airflow and the outer swirl secondary air. Furthermore, the nozzle of the first hydrogen injection assembly is located axially adjacent to the outlet end of the primary air channel 10 of the hydrogen-coal co-fired device, so that the first hydrogen is injected in the region where the pulverized coal airflow has just exited from the primary air nozzle 60 and begun to enter the boiler 100, rather than in the downstream region far from the starting position of the pulverized coal airflow. This allows the first hydrogen to ignite near the root of the pulverized coal airflow first, and directly transfer the heat released by combustion to the pulverized coal airflow that has not yet been fully ignited.

[0053] In this embodiment, the region where the pulverized coal gas flow has not yet fully diffused radially and completely mixed with the surrounding airflow after being ejected from the primary air nozzle 60 can be understood as the root of the pulverized coal gas flow. This region is adjacent to the primary air nozzle 60. By arranging the nozzle of the first hydrogen injection assembly inside the swirling secondary air channel 40 and making it adjacent to the primary air nozzle 60, the first hydrogen can directly enter the root of the pulverized coal gas flow and the swirling secondary air flow without having to undergo a long distance of transportation or diffusion before contacting the pulverized coal.

[0054] Optionally, the nozzle of the first hydrogen injection assembly and the primary air nozzle 60 are located in the same radial section perpendicular to the axial direction of the hydrogen-coal co-combustion device. That is, their axial positions are the same or substantially the same, but they are radially spaced apart. The nozzle of the first hydrogen injection assembly is located on the outer periphery of the primary air nozzle 60, between the primary air channel 10 and the swirling secondary air channel 40. With this arrangement, the first hydrogen can be injected simultaneously into the space between the outer edge of the pulverized coal flow and the swirling secondary air as soon as the pulverized coal flow exits from the primary air nozzle 60, making the starting position of the hydrogen injection axially correspond to the formation position of the pulverized coal flow. Therefore, the first hydrogen does not need to travel a long axial distance to act on the root of the pulverized coal flow and can ignite before the pulverized coal, using the heat released from its combustion to heat the pulverized coal flow nearby. Meanwhile, the high-temperature flue gas generated by hydrogen combustion can flow back to the vicinity of the primary air nozzle 60 under the entrainment effect of the swirling secondary air, further enhancing the heating and ignition of the coal powder root, thereby shortening the ignition delay of the coal powder and improving the stability of the flame under low load conditions.

[0055] A direct-flow secondary air duct 50 is arranged around the swirl secondary air duct 40 and extends along the axial direction of the hydrogen-coal co-fired device. Thus, the primary air duct 10, the swirl secondary air duct 40, and the direct-flow secondary air duct 50 form a multi-layered airflow channel arranged sequentially from the inside to the outside in the radial direction of the device. The direct-flow secondary air duct 50 is used to output direct-flow secondary air flowing axially along the hydrogen-coal co-fired device at the outer periphery of the swirl secondary air. Compared to the swirl secondary air, the direct-flow secondary air maintains an axial velocity component toward the interior of the boiler 100, thereby enabling the downstream delivery of supplementary oxygen along the outer periphery of the combustion zone.

[0056] The second hydrogen injection assembly is used to inject a second type of hydrogen. The nozzle of the second hydrogen injection assembly is located radially in the hydrogen-coal co-fired device, between the swirling secondary air channel 40 and the direct-flow secondary air channel 50, allowing the second hydrogen to be injected into the boiler 100 from between the outer side of the swirling secondary air and the inner side of the direct-flow secondary air. Thus, radially in the hydrogen-coal co-fired device, the central region is a pulverized coal airflow, with the first hydrogen, swirling secondary air, second hydrogen, and direct-flow secondary air sequentially distributed around the pulverized coal airflow, forming a combustion organization where hydrogen and combustion air are supplied in stages at different radial positions.

[0057] Furthermore, the nozzle of the second hydrogen injection assembly is positioned axially along the coal-hydrogen co-combustion device, closer to the outlet end of the device than the nozzle of the first hydrogen injection assembly. Specifically, the first hydrogen injection assembly is located adjacent to the primary air nozzle 60 and is used to inject first hydrogen at the root of the pulverized coal flow; the second hydrogen injection assembly is positioned downstream of the first hydrogen injection location and can be located adjacent to the burner nozzle 80. This axially staggered arrangement of the first and second hydrogens ensures that the hydrogen is not concentrated at the same axial position but rather acts on different stages of the pulverized coal combustion process.

[0058] It should be noted that the burner nozzle 80 is the overall outlet formed at the end of the hydrogen-coal co-combustion device facing the furnace of the boiler 100. That is, the outlet area where the pulverized coal gas flow, swirling secondary air, direct secondary air and two-stage hydrogen enter the furnace together after being output through their respective channels or nozzles. It does not refer to an independent nozzle of a specific gas flow channel.

[0059] Based on the above structural relationship, the pulverized coal gas flow output from the primary air channel 10, the first hydrogen gas output from the first hydrogen injection assembly, and the swirling secondary air gas output from the swirling secondary air channel 40 form a combustion organization pattern distributed sequentially from the inside to the outside in the radial direction of the hydrogen-coal co-combustion device. Thus, the first hydrogen gas concentrates its action on the root of the pulverized coal gas flow and its interface with the swirling secondary air, forming a hydrogen-assisted combustion zone arranged around the root of the pulverized coal gas flow.

[0060] Because hydrogen has a lower ignition energy and a faster combustion reaction rate than pulverized coal, the first hydrogen gas entering the boiler 100 can ignite before the pulverized coal airflow, forming a hydrogen flame near the primary air nozzle 60, thus constituting... Figure 2 The ignition zone is shown. The heat released by the combustion of the first hydrogen gas can be directly transferred to the adjacent pulverized coal gas flow, increasing the local temperature at the root of the pulverized coal gas flow; the high-temperature flue gas generated by the combustion of the first hydrogen gas can also come into contact with the pulverized coal particles, enabling the pulverized coal particles to reach the ignition conditions more quickly. In summary, the embodiments of this application provide external heat to the root of the pulverized coal gas flow by the prior combustion of the first hydrogen gas, thereby reducing the heat absorbed by the pulverized coal particles from the surrounding environment required to reach the ignition state, promoting pulverized coal ignition or reducing the heat required for the pulverized coal gas flow to ignite.

[0061] Meanwhile, the swirling secondary air surrounding the first hydrogen gas continuously rotates and flows, enhancing the turbulence and mixing between the first hydrogen gas, the pulverized coal gas flow, and the high-temperature flue gas. It also organizes the entrainment and recirculation of high-temperature flue gas near the root of the pulverized coal gas flow. Some of the high-temperature flue gas produced by the combustion of the first hydrogen gas is carried back to the root of the pulverized coal gas flow under the action of the swirling secondary air, allowing the root of the pulverized coal gas flow to continuously receive heat, thereby improving the stability of the flame at the root of the pulverized coal gas flow.

[0062] When a coal-fired unit is operating at low load, the amount of pulverized coal entering the boiler 100 decreases, resulting in insufficient heat generated by the combustion of the pulverized coal itself. This can easily lead to problems such as delayed ignition or flame detachment from the primary air nozzle 60 in the pulverized coal airflow. In this embodiment, a first hydrogen injection assembly located near the root of the pulverized coal airflow can provide supplementary heat through hydrogen combustion when the pulverized coal itself is insufficient. Furthermore, the swirling secondary air continuously recirculates the high-temperature flue gas back to the root of the pulverized coal airflow. Therefore, the pulverized coal particles can complete heating and ignition within a shorter distance after leaving the primary air nozzle 60, shortening the ignition delay of the pulverized coal airflow and reducing the possibility of flame fluctuations or flameout due to a decrease in pulverized coal supply.

[0063] Furthermore, because the combustion rate of the first hydrogen gas is faster than that of pulverized coal, when the first hydrogen gas burns first between the outer side of the pulverized coal gas flow and the inner side of the swirling secondary air flow, it preferentially consumes some of the oxygen in this boundary area, creating a localized low-oxygen combustion environment around the root of the pulverized coal gas flow and in the high-temperature flue gas recirculation area. This low-oxygen combustion is not complete oxygen deficiency, but rather ensures stable ignition of the pulverized coal gas flow while preventing rapid oxidation in an environment with excessively high oxygen concentrations. This reduces the conditions for the conversion of fuel nitrogen to nitrogen oxides in the early stages of pulverized coal combustion, thus inhibiting the formation of fuel-type nitrogen oxides.

[0064] During combustion, after the pulverized coal gas stream passes through the ignition zone and low-oxygen combustion zone, some pulverized coal remains incompletely burned, and a certain amount of nitrogen oxides may have already been generated in the early stages of combustion. Because the second hydrogen gas is injected closer to the outlet, it avoids the concentrated ignition area at the root of the pulverized coal gas stream and forms a downstream-extending hydrogen jet outside the swirling secondary airflow. Initially, the second hydrogen gas does not directly enter the mainstream area of ​​the swirling secondary airflow with higher oxygen content; instead, it is transported downstream with the airflow under relatively low local oxygen concentrations, reducing the likelihood of premature concentrated combustion of the second hydrogen gas near the nozzle.

[0065] As the second hydrogen gas continues to move downstream, it gradually mixes with the pulverized coal gas stream and combustion products after passing through the ignition zone and low-oxygen combustion zone, thus forming... Figure 2 The deep reduction zone is shown. Within this zone, the second hydrogen gas can utilize its reducing properties to further reduce the nitrogen oxides already formed during the initial stage of pulverized coal combustion.

[0066] In this embodiment, the second hydrogen injection position is separated from the first hydrogen injection position axially, so that the first hydrogen mainly undertakes the ignition and combustion stabilization of pulverized coal, while the second hydrogen mainly acts on the downstream nitrogen oxide reduction process, thus avoiding the concentration of ignition enhancement and nitrogen oxide reduction in the same spatial area.

[0067] The direct-flow secondary air is located radially outside the second hydrogen gas. It flows downstream along the axial direction of the device and gradually mixes with the reduced pulverized coal gas flow after the deep reduction zone. This replenishes the oxygen needed for the combustion of the incompletely burned pulverized coal, thereby forming a rapid combustion zone further downstream and promoting the continued combustion of the remaining pulverized coal and combustible components. Therefore, by placing the direct-flow secondary air around the periphery of the swirling secondary air, it is possible to prevent premature and excessive oxygen entry into the deep reduction zone in the initial stage, thus weakening the reducing atmosphere. Simultaneously, it allows for timely replenishment of oxygen in the later stage, reducing the possibility of incomplete combustion of pulverized coal due to low oxygen levels in the early stages.

[0068] Based on the above structural relationships, and building upon the pulverized coal root ignition and low-oxygen combustion achieved by the structure of the primary air channel, the swirling secondary air channel, and the first hydrogen injection assembly, this embodiment further utilizes the radial layered arrangement of the second hydrogen injection assembly and the direct current secondary air channel 50, and the axial layered arrangement of the first and second hydrogen injection positions, to sequentially form an ignition zone, a low-oxygen combustion zone, a deep reduction zone, and a rapid combustion zone along the airflow direction during the combustion process. Thus, the first hydrogen can be used to enhance pulverized coal ignition, the low-oxygen environment at the front end can be used to suppress nitrogen oxide generation, the second hydrogen can be used to reduce already generated nitrogen oxides, and the direct current secondary air can be used to supplement oxygen and promote pulverized coal burnout, thereby synergistically regulating low-load stable combustion, nitrogen oxide emission control, and complete pulverized coal combustion.

[0069] In summary, by means of the above technical solution, the hydrogen-coal co-combustion device provided in this application has a primary air channel that extends axially along the device and is located radially inward, allowing the coal powder-carrying gas flow to be transported along the central area of ​​the device towards the outlet end, thereby forming a relatively concentrated coal powder gas flow near the outlet of the primary air channel. The nozzle of the first hydrogen injection assembly is radially located inside the swirling secondary air channel and axially adjacent to the outlet end of the primary air channel, allowing the first hydrogen to be directly injected into the area between the root of the coal powder gas flow and the swirling secondary air. Since hydrogen is more ignitable than coal powder, the injected first hydrogen can burn first near the root of the coal powder gas flow, and the heat released by its combustion and the high-temperature flue gas formed can be transferred to the coal powder gas flow nearby, thereby increasing the temperature at the root of the coal powder gas flow and promoting coal powder ignition.

[0070] Meanwhile, because the swirling secondary air channel is set around the primary air channel, the swirling secondary air can rotate and flow around the pulverized coal airflow. It generates shearing, disturbance and entrainment effects on the pulverized coal airflow from the periphery, which enhances the mixing of the first hydrogen, the pulverized coal airflow and the high-temperature combustion gas. It also rolls the high-temperature flue gas formed by the combustion of the first hydrogen back to the root of the pulverized coal airflow, so that the pulverized coal particles can continuously obtain the heat and oxygen required for ignition. This shortens the ignition delay of pulverized coal and improves the ignition stability and continuous combustion capability of the pulverized coal airflow under low load conditions.

[0071] Furthermore, the second hydrogen injection assembly is positioned between the swirling secondary air channel and the direct-flow secondary air channel, with its nozzle axially downstream of the nozzle of the first hydrogen injection assembly. This allows the second hydrogen to bypass the concentrated ignition zone at the root of the pulverized coal flow, creating a reducing atmosphere in the downstream region after initial ignition and low-oxygen combustion. The reducing effect of the second hydrogen further reduces the nitrogen oxides already generated during pulverized coal combustion. Simultaneously, the direct-flow secondary air channel surrounds the swirling secondary air channel, allowing it to be axially transported downstream from the outer periphery of the combustion zone. This reduces the premature entry of oxygen into the reducing zone formed by the second hydrogen, which weakens the reducing effect. Further downstream, it gradually mixes with the incompletely combusted pulverized coal flow, supplementing oxygen for subsequent combustion and promoting complete combustion of remaining pulverized coal and other combustible components. Thus, through the staged arrangement of the first hydrogen, the second hydrogen, the swirling secondary air, and the direct-flow secondary air, synergistic regulation is achieved between stable pulverized coal combustion, nitrogen oxide generation inhibition, reduction of generated nitrogen oxides, and subsequent pulverized coal combustion.

[0072] In addition, by utilizing the preferential consumption of local oxygen by the first hydrogen gas, the pulverized coal gas flow is in a moderately low-oxygen environment during the initial combustion stage, which inhibits the formation of fuel-type nitrogen oxides, thereby improving the control effect of nitrogen oxide emissions while improving combustion stability.

[0073] Next, other possible implementations of the hydrogen-coal co-firing device proposed in this application will be described in detail through the following embodiments.

[0074] In one possible implementation, the first hydrogen injection assembly may include a plurality of first hydrogen nozzles 20, which are disposed inside the swirling secondary air channel 40 and distributed circumferentially along the primary air channel 10, thereby forming a multi-point hydrogen injection structure arranged in a ring around the primary air channel 10. Each first hydrogen nozzle 20 extends axially along the hydrogen-coal co-firing device, and its end facing the outlet end of the hydrogen-coal co-firing device forms a first hydrogen nozzle. All the first hydrogen nozzles together constitute the nozzle of the first hydrogen injection assembly. Here, the nozzle of the first hydrogen injection assembly is not a single continuous opening, but a combined nozzle formed by multiple circumferentially dispersed first hydrogen nozzles.

[0075] During operation, the first hydrogen gas is injected through multiple first hydrogen gas nozzles 20 into the area between the root of the pulverized coal gas flow and the swirling secondary air, allowing the first hydrogen gas to simultaneously enter the ignition zone from multiple locations around the pulverized coal gas flow. Compared to concentrated hydrogen injection at a single location, this circumferential multi-point injection method can expand the coverage area of ​​the first hydrogen gas around the root of the pulverized coal gas flow, reduce the excessive concentration of hydrogen gas in local areas, and ensure that the heat released by hydrogen combustion and the resulting high-temperature flue gas act more evenly on the outer periphery of the pulverized coal gas flow. This improves the ignition consistency of various areas around the pulverized coal gas flow and is conducive to the formation of a stable annular ignition zone.

[0076] In another possible implementation, the second hydrogen injection assembly includes multiple second hydrogen nozzles 30, which are disposed between the swirling secondary air channel 40 and the direct-flow secondary air channel 50, and are distributed circumferentially at intervals along the swirling secondary air channel 40, thereby forming another set of annular multi-point hydrogen injection structures on the radially outer side of the swirling secondary air. Each second hydrogen nozzle 30 forms a second hydrogen nozzle at its end facing the outlet of the hydrogen-coal co-combustion device, and all the second hydrogen nozzles together constitute the nozzle of the second hydrogen injection assembly.

[0077] The second hydrogen gas is ejected from different circumferential positions on the outer periphery of the swirling secondary air through multiple second hydrogen nozzles, forming multiple hydrogen jets extending downstream of the combustion zone. These multiple second hydrogen jets can disperse the hydrogen supply circumferentially within the combustion zone, reducing the excessively high local hydrogen concentration caused by a single hydrogen jet. This allows the second hydrogen gas to more fully contact the pulverized coal gas stream and combustion products after passing through the low-oxygen combustion zone, thereby expanding the effective range of the deep reduction zone and improving the circumferential uniformity of the nitrogen oxide reduction process.

[0078] Furthermore, the circumferential distribution of the first hydrogen nozzle 20 and the second hydrogen nozzle 30 allows the two stages of hydrogen to be mixed at multiple points in different radial and axial positions, forming an axial, radial, and circumferentially dispersed supply of hydrogen.

[0079] Optionally, each group of hydrogen nozzles can use a pipe diameter of less than 10 mm, and the number of nozzles can be set to 10 to 30 depending on the burner size, target hydrogen flow rate and circumferential injection uniformity; multiple nozzles can be set at equal angles, or different circumferential intervals can be used according to the airflow distribution in the combustion area.

[0080] This application also provides a control method for a hydrogen-coal co-firing device. This method can be applied to any of the hydrogen-coal co-firing devices provided in the above embodiments, or it can be executed by a control terminal, electronic equipment, or other equipment with data processing and control functions for controlling the hydrogen-coal co-firing device. (Refer to...) Figure 3 The present application provides a schematic flowchart of a control method for a hydrogen-coal co-firing device. The control method for the hydrogen-coal co-firing device may include steps S210 to S240, which are described in detail below.

[0081] Step S210: Obtain the unit load of the coal-fired unit and determine the target hydrogen blending amount based on the unit load.

[0082] In this embodiment, the unit load can be determined by the ratio of the current output load of the coal-fired unit to its rated load, and the total amount of hydrogen to be supplied to the hydrogen-coal co-firing device can be planned based on the current unit load as the target hydrogen blending amount. Optionally, the target hydrogen blending amount can be expressed as the ratio of the heat provided by hydrogen to the total heat of the fuel, i.e., the hydrogen blending heat ratio, or it can be expressed as the hydrogen supply amount corresponding to the hydrogen blending heat ratio.

[0083] In one possible implementation, a pre-established correspondence between different unit load ranges and the hydrogen blending heat ratio can be established. When the unit load is 70%–100% of the rated load, the target hydrogen blending heat ratio can be set at 0–30% to avoid creating localized concentrated heat load areas by continuing to blend large amounts of hydrogen when the pulverized coal supply is high. When the unit load is 40%–70% of the rated load, as the amount of pulverized coal decreases, the target hydrogen blending heat ratio can be increased to 30%–50%. The easy ignition and rapid heat release of hydrogen during combustion can supplement the heat required for pulverized coal combustion, thereby enhancing the stable combustion effect at low loads. When the unit load further decreases to 20%–40% of the rated load, the pulverized coal preparation unit may deviate significantly from its design operating conditions and find it difficult to continue to stably supply pulverized coal. At this time, the hydrogen-coal co-combustion unit can be switched to pure hydrogen combustion to support deep peak shaving of the coal-fired unit.

[0084] Furthermore, in the boiler 100 startup scenario, hydrogen can be supplied to the first and second hydrogen injection components and ignited first, using the pre-formed hydrogen flame to ignite the subsequently output pulverized coal gas flow. The hydrogen blending heat ratio during boiler startup can be controlled within 10%, allowing hydrogen to primarily serve as the ignition source for pulverized coal.

[0085] Step S220: According to the preset allocation relationship, the target hydrogen blending amount is allocated as the first hydrogen supply amount and the second hydrogen supply amount.

[0086] This step can determine the hydrogen supply amount corresponding to each hydrogen injection component based on a predefined hydrogen distribution ratio between different hydrogen injection positions, i.e., a preset distribution relationship, so that the hydrogen injected at different positions can respectively undertake the corresponding combustion regulation function. In the embodiments of this application, a first hydrogen supply amount and a second hydrogen supply amount can be obtained. The first hydrogen supply amount represents the amount of hydrogen allocated from the target hydrogen blending amount to the first hydrogen injection component, and the second hydrogen supply amount represents the amount of hydrogen allocated from the target hydrogen blending amount to the second hydrogen injection component.

[0087] For example, 20%–40% of the target hydrogen blending amount can be allocated as the first hydrogen supply, and the remaining 60%–80% as the second hydrogen supply. The first hydrogen injection assembly is located near the root of the pulverized coal gas flow, and the first hydrogen supplied to it is mainly used to pre-combust and heat the pulverized coal gas flow in the ignition zone to maintain stable ignition. The second hydrogen is mainly supplied to the downstream deep reduction zone to create a reducing atmosphere and reduce nitrogen oxides generated in the early stages of pulverized coal combustion. Therefore, by allocating the target hydrogen blending amount in stages, concentrated hydrogen supply at a single location can be avoided, and sufficient hydrogen can be reserved for subsequent nitrogen oxide reduction while ensuring stable combustion in the front-end ignition zone.

[0088] The initial hydrogen supply should not be set too high. If the initial hydrogen is concentrated and burns near the root of the pulverized coal flow, consuming too much oxygen, it may cause excessive oxygen deficiency in the pulverized coal, affecting subsequent combustion. Therefore, the initial hydrogen supply can be determined by combining the target hydrogen blending amount and the supply status of the pulverized coal flow, so that the initial hydrogen can meet the ignition and stable combustion requirements of the pulverized coal, while maintaining the oxygen content suitable for low-oxygen combustion of pulverized coal.

[0089] Step S230: Control the primary air channel to output a coal powder airflow carrying coal powder, control the swirling secondary air channel to output swirling secondary air around the coal powder airflow, and control the first hydrogen injection assembly to inject first hydrogen according to the first hydrogen supply amount.

[0090] Referring to the above description of the hydrogen-coal co-combustion device, according to the first hydrogen supply determined in step S220, the first hydrogen injection assembly is controlled to inject first hydrogen between the root of the pulverized coal gas flow and the swirling secondary air. This allows the first hydrogen to enter the outer region of the pulverized coal gas flow as soon as it exits the primary air nozzle 60 and ignite before the pulverized coal. The heat released by the combustion of the first hydrogen directly heats the pulverized coal gas flow. Simultaneously, the shearing, turbulence, and entrainment effects of the swirling secondary air enhance the mixing between the first hydrogen, the pulverized coal gas flow, and the high-temperature flue gas. The high-temperature flue gas formed by the combustion of the first hydrogen is also drawn back to the root of the pulverized coal gas flow, ensuring that the pulverized coal particles continuously receive the heat required for ignition. This shortens the ignition delay of the pulverized coal and improves the ignition stability and sustained combustion capability of the pulverized coal gas flow under low-load conditions. Furthermore, the pre-combustion of the first hydrogen can consume some oxygen on the outer side of the pulverized coal gas flow and the inner side of the swirling secondary air, creating a moderately low-oxygen environment in the initial combustion stage of the pulverized coal gas flow, which helps to suppress the formation of fuel-type nitrogen oxides.

[0091] While step S230 is being executed, step S240 is also being executed. According to the second hydrogen supply, the second hydrogen injection assembly is controlled to inject second hydrogen downstream of the injection position of the first hydrogen, and the DC secondary air channel is controlled to output DC secondary air at the outer periphery of the swirling secondary air.

[0092] Since the nozzle of the second hydrogen injection assembly is located downstream of the nozzle of the first hydrogen injection assembly in the axial direction of the hydrogen-coal co-combustion device, and is located between the swirl secondary air channel 40 and the direct current secondary air channel 50 in the radial direction, the second hydrogen can be injected from between the outside of the swirl secondary air and the inside of the direct current secondary air, forming a hydrogen jet extending downstream along the axial direction of the device.

[0093] In the initial stage of the second hydrogen injection, due to the radial separation between the second hydrogen and the oxygen-rich zone of the swirling secondary air, and the fact that the direct-flow secondary air located outside it mainly transports downstream axially, the second hydrogen does not immediately and fully mix with a large amount of oxygen near the nozzle. Therefore, it can extend downstream under localized oxygen-deficient conditions. As the oxygen in the swirling secondary air is gradually consumed by the combustion of the first hydrogen and pulverized coal in the preceding stage, the second hydrogen further mixes with the pulverized coal gas flow and combustion products after passing through the ignition zone and low-oxygen combustion zone, thus forming a deep reduction zone downstream. The second hydrogen utilizes its reducing properties to act on the nitrogen oxides already generated in the early stages of pulverized coal combustion, thereby reducing nitrogen oxide emissions.

[0094] Simultaneously, the DC secondary air channel 50 outputs DC secondary air along the axial direction of the hydrogen-coal co-combustion device at the outer periphery of the swirling secondary air. The DC secondary air is transported downstream from the outer periphery of the combustion zone and gradually mixes with the incompletely combusted pulverized coal airflow after passing through the deep reduction zone, supplementing oxygen for subsequent pulverized coal combustion, thereby forming a rapid combustion zone and promoting the complete combustion of remaining pulverized coal and other combustible components. This avoids insufficient combustion of pulverized coal in the subsequent stages due to maintaining a reducing atmosphere in the initial stage.

[0095] Optionally, the injection velocities of the first and second hydrogen gases can be controlled to be greater than 100 m / s, so that the first and second hydrogen gases have sufficient jet flow and reduce the possibility of backfire caused by the hydrogen flame spreading into the first hydrogen nozzle.

[0096] In another possible implementation, the control method for the hydrogen-coal co-firing device may further include: obtaining the nitrogen oxide concentration at the outlet side of the hydrogen-coal co-firing device, and adjusting the second hydrogen supply and the direct current secondary air supply based on the deviation between the nitrogen oxide concentration and the target nitrogen oxide concentration.

[0097] In this embodiment of the application, a nitrogen oxide detection device can be installed at the outlet end of the hydrogen-coal co-combustion device, and the concentration of nitrogen oxides in the combustion products collected by the nitrogen oxide detection device can be detected. Specifically, the nitrogen oxide concentration is compared with a preset target nitrogen oxide concentration to obtain the concentration deviation between the two. The target nitrogen oxide concentration can be preset according to the emission control requirements of the coal-fired unit.

[0098] When the detected nitrogen oxide concentration is higher than the target nitrogen oxide concentration, the supply of second hydrogen can be increased, allowing the second hydrogen injection assembly to inject more second hydrogen into the deep reduction zone. This increases the hydrogen concentration in the zone and enhances its reducing power, further reducing the nitrogen oxides already generated during pulverized coal combustion. Simultaneously, the supply of direct-current secondary air can be adjusted in conjunction with the second hydrogen supply to prevent premature entry of the direct-current secondary air into the deep reduction zone, which would weaken its reducing power, and to ensure that incompletely burned pulverized coal after passing through the deep reduction zone receives the oxygen required for complete combustion.

[0099] When the nitrogen oxide concentration reaches the target nitrogen oxide concentration, the current supply of secondary hydrogen and direct current secondary air can be maintained; when the nitrogen oxide concentration is lower than the target nitrogen oxide concentration, the supply of secondary hydrogen can be appropriately reduced to reduce hydrogen consumption. Therefore, the secondary hydrogen and direct current secondary air can be synergistically regulated based on nitrogen oxide emission results, improving nitrogen oxide reduction efficiency while ensuring complete combustion of pulverized coal.

[0100] In summary, the control method for the hydrogen-coal co-combustion device provided in this application determines the target hydrogen blending amount based on the unit load of the coal-fired power plant, enabling the hydrogen supply to match changes in pulverized coal supply and stable combustion requirements. This reduces the risk of localized heat load concentration caused by excessive hydrogen supply under high loads, and enhances pulverized coal ignition using the heat released from hydrogen combustion under low loads. Furthermore, the first hydrogen supply amount is determined according to a preset distribution relationship, and the first hydrogen is controlled to be injected between the root of the pulverized coal flow and the swirling secondary air, allowing the first hydrogen to burn first near the root of the pulverized coal flow. Simultaneously, the swirling secondary air enhances the mixing and recirculation between hydrogen, pulverized coal flow, and high-temperature flue gas, thereby shortening the pulverized coal ignition delay and improving the ignition stability and sustained combustion capacity of the pulverized coal flow under low load conditions. In addition, the pre-combustion of the first hydrogen consumes some oxygen from the periphery of the pulverized coal flow, keeping the pulverized coal in a moderately low-oxygen combustion state and suppressing the formation of fuel-type nitrogen oxides. With the second hydrogen injection assembly and DC secondary air channel installed, the second hydrogen injected downstream can be used to reduce the nitrogen oxides that have already been generated, and the DC secondary air can be used to supplement oxygen in the later stage to promote the burnout of pulverized coal. This achieves synergistic control between ignition enhancement, low oxygen suppression, nitrogen oxide reduction and subsequent burnout, improves the adaptability of the hydrogen-coal co-firing unit to different unit loads, and takes into account both combustion stability and pollutant emission control effects.

[0101] This application also provides an electronic device in its embodiments. (See reference...) Figure 4The diagram illustrates a structural schematic suitable for implementing the electronic device in the embodiments of this application. The electronic device in the embodiments of this application may include, but is not limited to, devices such as controllers, programmable logic controllers, industrial control computers, edge computing devices, or servers that acquire unit operating data and output combustion control commands. Figure 4 The electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0102] like Figure 4 As shown, the electronic device may include a processing unit (e.g., a central processing unit, a graphics processing unit, etc.) 1, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 2 or a program loaded from a storage device 8 into a random access memory (RAM) 3, to implement the control method of the hydrogen-coal co-firing device of the foregoing embodiments of this application. When the electronic device is powered on, the RAM 3 also stores various programs and data required for the operation of the electronic device. The processing unit 1, ROM 2, and RAM 3 are interconnected via a bus 4. An input / output (I / O) interface 5 is also connected to the bus 4.

[0103] Typically, the following devices can be connected to I / O interface 5: input devices 6 including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 7 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices 8 including, for example, memory cards, hard drives, etc.; and communication devices 9. Communication device 9 allows electronic devices to communicate wirelessly or wiredly with other devices to exchange data. Although Figure 4 Electronic devices with various devices are shown, but it should be understood that it is not required to implement or have all of the devices shown. More or fewer devices may be implemented or have alternatively.

[0104] This application also provides a computer program product, including computer-readable instructions, which, when executed on an electronic device, cause the electronic device to implement any of the control methods for hydrogen-coal co-firing devices provided in this application.

[0105] This application also provides a computer-readable storage medium carrying one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement any of the control methods for the hydrogen-coal co-firing device provided in this application.

[0106] It should also be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. In addition, in the device embodiment drawings provided in this application, the connection relationship between modules indicates that they have a communication connection, which can be implemented as one or more communication buses or signal lines.

[0107] Through the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware, or it can be implemented by special-purpose hardware including application-specific integrated circuits, special-purpose CPUs, special-purpose memory, special-purpose components, etc. Generally, any function performed by a computer program can be easily implemented by corresponding hardware, and the specific hardware structure used to implement the same function can also be diverse, such as analog circuits, digital circuits, or special-purpose circuits. However, for this application, software program implementation is more often the preferred implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a readable storage medium, such as a computer floppy disk, USB flash drive, mobile hard disk, ROM, RAM, magnetic disk, or optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, training equipment, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0108] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product.

[0109] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, training device, or data center to another website, computer, training device, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a training device or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., DVDs), or semiconductor media (e.g., solid-state drives (SSDs)).

[0110] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The various embodiments can be combined as needed, and the same or similar parts can be referred to each other.

Claims

1. A hydrogen-coal co-combustion device, characterized in that, include: Primary air duct, swirl secondary air duct, first hydrogen injection assembly, direct current secondary air duct and second hydrogen injection assembly; The primary air duct extends along the axial direction of the hydrogen-coal co-firing device and is located on the radial inner side of the hydrogen-coal co-firing device, for conveying a coal powder airflow carrying coal powder in the direction toward the outlet end of the hydrogen-coal co-firing device. The swirling secondary air channel is arranged around the primary air channel and is used to output swirling secondary air rotating around the axis of the hydrogen-coal co-combustion device at the outer periphery of the pulverized coal airflow. The nozzle of the first hydrogen injection assembly is located radially inside the swirl secondary air channel of the hydrogen-coal co-firing device, and axially adjacent to the outlet end of the primary air channel of the hydrogen-coal co-firing device, for injecting first hydrogen into the area between the root of the pulverized coal airflow and the swirl secondary air. The DC secondary air channel is arranged around the swirl secondary air channel and is used to output DC secondary air along the axial direction of the hydrogen-coal co-combustion device on the outer periphery of the swirl secondary air. The nozzle of the second hydrogen injection assembly is located radially in the hydrogen-coal co-firing device, between the swirl secondary air channel and the direct current secondary air channel. Furthermore, the nozzle of the second hydrogen injection assembly is located axially in the hydrogen-coal co-firing device, closer to the outlet end of the hydrogen-coal co-firing device than the nozzle of the first hydrogen injection assembly, and is used to inject second hydrogen.

2. The hydrogen-coal co-combustion device according to claim 1, characterized in that, One end of the primary air passage facing the outlet end of the hydrogen-coal co-firing device forms a primary air nozzle, and the nozzle of the first hydrogen injection assembly and the primary air nozzle are located in the same radial section perpendicular to the axial direction of the hydrogen-coal co-firing device.

3. The hydrogen-coal co-combustion device according to claim 1, characterized in that, The first hydrogen injection assembly includes a plurality of first hydrogen nozzles, which are distributed circumferentially along the primary air passage. The ends of all the first hydrogen nozzles facing the outlet of the hydrogen-coal co-firing device form the nozzles of the first hydrogen injection assembly.

4. The hydrogen-coal co-combustion device according to claim 2, characterized in that, The second hydrogen injection assembly includes a plurality of second hydrogen nozzles, which are circumferentially spaced along the swirl secondary air channel. The ends of all the second hydrogen nozzles facing the outlet of the hydrogen-coal co-combustion device form the nozzles of the second hydrogen injection assembly.

5. The hydrogen-coal co-firing device according to any one of claims 1-4, characterized in that, The swirl secondary air channel is equipped with swirl blades to cause the secondary air flowing through the swirl secondary air channel to form swirl secondary air.

6. A control method for a hydrogen-coal co-firing device, characterized in that, The control method, applied to a hydrogen-coal co-combustion device including a primary air duct, a swirl secondary air duct, and a first hydrogen injection assembly, includes: Obtain the unit load of the coal-fired power unit, and determine the target hydrogen blending amount based on the unit load; According to the preset allocation relationship, the target hydrogen blending amount is allocated as the first hydrogen supply amount and the second hydrogen supply amount; The primary air channel is controlled to output a coal powder airflow carrying coal powder, the swirling secondary air channel is controlled to output swirling secondary air around the coal powder airflow, and the first hydrogen injection assembly is controlled to inject first hydrogen according to the first hydrogen supply amount. According to the second hydrogen supply, the second hydrogen injection assembly is controlled to inject second hydrogen downstream of the first hydrogen injection position, and the DC secondary air channel is controlled to output DC secondary air at the outer periphery of the swirling secondary air.

7. The control method for the hydrogen-coal co-firing device according to claim 6, characterized in that, The method further includes: The nitrogen oxide concentration at the outlet side of the hydrogen-coal co-combustion device is obtained, and the second hydrogen supply and the DC secondary air supply are adjusted according to the deviation between the nitrogen oxide concentration and the target nitrogen oxide concentration.

8. An electronic device, characterized in that, include: Memory and processor; The memory is used to store programs; The processor is used to execute the program to implement the various steps of the control method for the hydrogen-coal co-firing device as described in any one of claims 6-7.

9. A readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the various steps of the control method for the hydrogen-coal co-firing device as described in any one of claims 6-7.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the various steps of the control method for the hydrogen-coal co-firing device as described in any one of claims 6-7.

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