Ammonia-coal co-combustion burner

Abstract

The invention discloses an ammonia-coal co-combustion burner, which comprises a primary air channel, a secondary air channel, an ammonia-coal co-combustion device and an ammonia-coal co-combustion device, the ammonia gas channel extends into the primary air channel and is used for conveying ammonia gas, and the end, located in the primary air channel, of the ammonia gas channel is connected with a spray head; and the flow guide mechanism is arranged in the primary air channel and located on the downstream of the spray head, the flow guide mechanism comprises a conductive ball, and the conductive ball can form adsorption force on pulverized coal after being powered on. When the device is used, the voltage of the conductive ball can be controlled according to the proportion of ammonia gas mixed in the ammonia gas channel. After the conductive ball is electrified, the adsorption capacity of the conductive ball to the pulverized coal can be adjusted by actively controlling the voltage of the conductive ball, and then the conductive ball pulls the pulverized coal in the airflow. The gathering degree of the pulverized coal can be controlled by controlling the magnitude of the voltage, namely the separation degree of the pulverized coal, the primary air and the ammonia gas is controlled, so that the pulverized coal and the ammonia gas can be combusted in different oxygen concentration environments.

Description

Technical Field

[0001] The present application relates to the technical field of boilers, and more specifically, to an ammonia-coal mixed combustion burner. Background Art

[0002] Coal-fired power generation is an important part of the current energy structure, and its carbon dioxide emissions account for about 40% of the total emissions. Therefore, reducing carbon emissions from coal-fired power generation is the key to reducing carbon emissions. Ammonia, as a carbon-free fuel, has a wide range of application potentials, and co-firing with coal can effectively reduce carbon dioxide emissions. Ammonia-coal co-firing technology, as an innovative way to utilize clean energy, has received widespread attention in recent years.

[0003] Ammonia-coal co-combustion technology achieves fossil fuel substitution by mixing ammonia in coal-fired boilers for combustion, significantly reducing carbon dioxide emissions. However, ammonia itself contains a large amount of nitrogen, which easily produces a large amount of nitrogen oxides (NOx) during combustion, which will cause new pollution problems to the environment.

[0004] Therefore, how to reduce nitrogen oxide emissions under mixed ammonia combustion conditions is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] In view of this, the purpose of the present application is to provide an ammonia-coal co-firing burner to reduce nitrogen oxide emissions under co-ammonia combustion conditions.

[0006] To achieve the above objectives, this application provides the following technical solutions:

[0007] The first aspect of the present application provides an ammonia-coal mixed combustion burner, comprising:

[0008] A primary air channel is used to transport the air-powder mixture of primary air and coal powder;

[0009] an ammonia channel extending into the primary air channel and used for conveying ammonia, wherein one end of the ammonia channel located in the primary air channel is connected to a nozzle;

[0010] The flow guiding mechanism is arranged in the primary air channel and is located downstream of the nozzle. The flow guiding mechanism includes a conductive ball, which can form an adsorption force on coal powder after being energized.

[0011] In a possible implementation of the present application, it also includes a secondary air channel arranged on the outside of the primary air channel, the secondary air channel is used to transport secondary air, and the outlet end of the secondary air channel and the outlet end of the primary air channel are both provided with adjustable nozzles, and the spray angle of the adjustable nozzle is adjustable.

[0012] In a possible implementation of the present application, the adjustable nozzle includes:

[0013] An inner layer adjustment plate, one end of which is a hinged end, so that it can swing along the hinged end, there are multiple inner layer adjustment plates, and they are arranged in a ring, and there is an adjustment avoidance gap between any two adjacent inner layer adjustment plates;

[0014] There are multiple outer adjustment plates, which are arranged in a ring shape. The outer adjustment plates are arranged on the outer ring of the inner adjustment plates and cover the adjustment avoidance gap. One end of the outer adjustment plates is a hinged end, so that it can swing along the hinged end. Each of the outer adjustment plates is synchronously connected by transmission.

[0015] The adjusting driving member is used to drive the inner adjusting plate and the outer adjusting plate to swing inward and outward so as to adjust the spray angle of the adjustable nozzle.

[0016] In a possible implementation of the present application, the adjustment drive member includes an inner elastic member, an outer elastic member and a pressure plate assembly;

[0017] The inner elastic member is used to drive the inner adjustment plate to swing outward, and the outer elastic member is used to drive the outer adjustment plate to swing outward;

[0018] The pressing plate assembly is used to press down the outer layer adjustment plate to drive the outer layer adjustment plate and the inner layer adjustment plate to swing inwards.

[0019] In a possible implementation of the present application, the pressure plate assembly includes a rotating rod, a swinging pressure plate, a rotating rod elastic member and a pull rope;

[0020] The rotating rod of the primary air channel is rotatably disposed on the primary air channel, and the rotating rod of the secondary air channel is rotatably disposed on the secondary air channel;

[0021] The swing pressure plate is fixed to the rotating rod so as to be driven by the rotating rod to swing;

[0022] The rotating rod elastic member is used to drive the rotating rod to drive the swinging pressure plate to press down the outer layer adjustment plate, and the pull rope is wound around the rotating rod to drive the rotating rod to drive the swinging pressure plate to lift up, so that the outer layer adjustment plate swings outward.

[0023] In a possible implementation of the present application, the secondary air channel includes an inner secondary air channel and an outer secondary air channel, the inner secondary air channel is sleeved on the outer side of the primary air channel, and the outer secondary air channel is sleeved on the outer side of the inner secondary air channel;

[0024] and / or,

[0025] Secondary air deflecting blades are arranged in the secondary air channel.

[0026] In a possible implementation of the present application, the flow guide mechanism includes a flow guide housing, both ends of the flow guide housing are flow guide cones, and the outer diameter of the flow guide cone gradually increases from the end to the middle of the flow guide housing;

[0027] The conductive ball is arranged at an end of the flow guide housing away from the nozzle.

[0028] In a possible implementation of the present application, the flow guiding mechanism further includes:

[0029] A first magnet is fixed in the guide housing;

[0030] A second magnet is slidably fitted in the flow guide housing and repels the first magnet;

[0031] A thrust elastic member, disposed in the guide housing, and used to push the second magnet to move toward the first magnet;

[0032] The sliding resistor component has two connection contacts, the two connection contacts are connected to the power supply circuit of the conductive ball, and the resistance value of the sliding resistor component changes with the movement of the second magnet.

[0033] In a possible implementation of the present application, the sliding resistor assembly includes a first conductive block and a second conductive block that are slidably matched, one of the two connecting contacts is arranged on the first conductive block, and the other is arranged on the second conductive block; one of the first conductive block and the second conductive block is fixed in the flow guide housing, and the other is connected to the second magnet, and when the second magnet moves in a direction close to the first magnet, the two connecting contacts move away from each other;

[0034] and / or,

[0035] The flow guide mechanism also includes a guide rod and a fixing frame, wherein the fixing frame and the guide rod are both fixed in the flow guide housing, the thrust elastic member and the second magnet are both sleeved on the guide rod, and one end of the thrust elastic member abuts against the fixing frame, and the other end abuts against the second magnet.

[0036] In a possible implementation of the present application, the ammonia channel is mixed with central air through a central air channel, one end of the central air channel is connected to the ammonia channel, and the other end extends outside the primary air channel;

[0037] and / or,

[0038] A plurality of primary wind deflection blades are arranged on the outer side of the guide mechanism;

[0039] and / or,

[0040] The nozzle is a porous ceramic nozzle.

[0041] The ammonia-coal mixed combustion burner provided in the present application is provided with a flow guiding mechanism in the primary air channel, and the flow guiding mechanism has a conductive ball. When the ammonia-coal mixed combustion burner is in use, the voltage of the conductive ball can be controlled according to the proportion of ammonia mixed into the ammonia channel. After the conductive ball is energized, the adsorption capacity of the conductive ball on coal powder can be adjusted by actively controlling the voltage of the conductive ball, so that the conductive ball can pull the coal powder in the airflow that is already gathered to the middle by the flow guiding mechanism. The degree of coal powder gathering can be controlled by controlling the voltage, that is, the degree of separation of coal powder from primary air and ammonia can be controlled, so that coal powder and ammonia can be burned in different oxygen concentration environments.

[0042] When the ammonia-coal mixed combustion burner burns at a low ammonia mixing ratio, the voltage of the conductive ball can be reduced, and the adsorption capacity of the conductive ball on coal powder can be reduced, so that the coal powder can be fully mixed in the primary air channel, causing the coal powder to burn in a relatively oxygen-rich state, while the ammonia burns in a relatively oxygen-deficient state, thereby reducing the content of nitrogen oxides generated by the combustion of ammonia.

[0043] When the ammonia-coal mixed combustion burner burns at a high ammonia ratio, the voltage of the conductive ball can be increased, and the conductive ball's adsorption capacity for coal powder can be enhanced, so that the coal powder gathers in the central area in the primary air channel, and a stratified combustion atmosphere is formed in the primary air channel with the central layer being coal powder and the outer layer being a mixture of air and ammonia. As a result, in the initial stage of combustion, the coal powder is in a relatively oxygen-deficient state and the ammonia is in a relatively oxygen-rich state. At this time, ammonia burns in an oxygen-rich state to generate a large amount of nitrogen oxides, but because the total air volume of the primary air is not enough to achieve complete combustion of ammonia, there will still be a large amount of residual ammonia in the primary air channel. The nitrogen oxides generated by the oxygen-rich combustion of ammonia and the unburned residual ammonia will undergo a reduction reaction in an oxygen-deficient environment to generate nitrogen, achieving a significant reduction in the content of nitrogen oxides. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 This is a schematic diagram of the structure of the ammonia-coal mixed combustion burner disclosed in the embodiment of the present application;

[0046] Figure 2 This is a schematic diagram of the internal structure of the ammonia-coal mixed combustion burner disclosed in the embodiment of the present application;

[0047] Figure 3 A schematic diagram of the internal structure of the flow guiding mechanism disclosed in the embodiment of the present application;

[0048] Figure 4 for Figure 2 A partial enlarged view of middle A;

[0049] Figure 5 for Figure 3 A partial enlarged view of B.

[0050] The meanings of the reference numerals in the figures are as follows:

[0051] 1-primary air channel; 2-inner secondary air channel; 3-outer secondary air channel; 4-ammonia channel; 5-central air channel; 6-nozzle; 7-adjustable nozzle; 8-fixing ring; 9-primary air deflection blade; 10-guiding mechanism; 11-secondary air deflection blade;

[0052] 101-flow guide housing; 102-guide rod; 103-fixed frame; 104-first magnet; 105-second magnet; 106-connecting piece; 107-first conductive block; 108-second conductive block; 109-limiting rod; 110-connecting contact; 111-thrust elastic piece; 112-conductive ball;

[0053] 701-inner layer adjustment plate; 702-outer layer adjustment plate; 703-pressing strip; 704-support body; 705-rotating rod; 706-swinging pressure plate; 707-pull rope. DETAILED DESCRIPTION

[0054] The core of this application is to provide an ammonia-coal co-firing burner to reduce nitrogen oxide emissions under co-firing conditions.

[0055] The following describes the embodiments with reference to the accompanying drawings. In addition, the embodiments shown below do not limit the content of the application described in the claims. In addition, the entire content of the composition represented by the following embodiments is not limited to the solution required as the application described in the claims. It should be noted that, for the convenience of description, only the parts related to the relevant application are shown in the drawings. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other.

[0056] like Figure 1-Figure 3 As shown, the ammonia-coal mixed combustion burner disclosed in the embodiment of the present application includes a primary air channel 1, an ammonia channel 4 and a flow guide mechanism 10. Among them, the primary air channel 1 is used to transport the air-powder mixture of primary air and coal powder. The primary air channel 1 can be Figure 1 The channel structure shown with a bending structure may also be without a bending structure, and should be designed specifically according to the use environment of the ammonia-coal mixed combustion burner.

[0057] The ammonia channel 4 extends into the primary air channel 1 for conveying ammonia. One end of the ammonia channel 4 located in the primary air channel 1 is connected to a nozzle 6, which can be a porous ceramic nozzle to ensure high heat resistance. It should be noted that in order to facilitate the introduction of ammonia, the inlet end of the ammonia channel 4 needs to be arranged outside the primary air channel 1 to facilitate connection with the ammonia supply equipment. The ammonia and central wind conveyed by the ammonia channel 4 are sprayed into the primary air channel 1 through the nozzle 6.

[0058] The guide mechanism 10 is arranged in the primary air channel 1 and is located downstream of the nozzle 6. The guide mechanism 10 includes a conductive ball 112. The conductive ball 112 can form an adsorption force on the coal powder after being energized. It can be understood by those skilled in the art that the adsorption force of the conductive ball 112 on the coal powder is related to the voltage passed into the conductive ball 112. Therefore, the adsorption capacity of the conductive ball 112 can be changed by controlling the voltage of the conductive ball 112, and then the degree of coal powder gathering to the center can be adjusted.

[0059] The ammonia-coal mixed combustion burner disclosed in the embodiment of the present application is provided with a flow guide mechanism 10 in the primary air channel 1, and the flow guide mechanism 10 has a conductive ball 112. When the ammonia-coal mixed combustion burner is in use, the voltage of the conductive ball 112 can be controlled according to the proportion of ammonia mixed into the ammonia channel 4. After the conductive ball 112 is energized, the adsorption capacity of the conductive ball 112 on coal powder can be adjusted by actively controlling the voltage of the conductive ball 112, so that the conductive ball 112 can pull the coal powder in the airflow that is already gathered to the middle by the flow guide mechanism 10. The degree of coal powder gathering can be controlled by controlling the voltage, that is, the degree of separation of coal powder from the primary air and ammonia can be controlled, so that the coal powder and ammonia can be burned in different oxygen concentration environments.

[0060] When the ammonia-coal mixed combustion burner burns at a low ammonia mixing ratio, the voltage of the conductive ball 112 can be reduced, and the adsorption capacity of the conductive ball 112 on coal powder can be reduced, so that the coal powder can be fully mixed in the primary air channel 1, resulting in the coal powder burning in a relatively oxygen-rich state, while the ammonia burns in a relatively oxygen-deficient state, thereby reducing the content of nitrogen oxides generated by the combustion of ammonia.

[0061] When the ammonia-coal mixed combustion burner burns at a high ammonia ratio, the voltage of the conductive ball 112 can be increased to enhance the adsorption capacity of the conductive ball 112 on coal powder, so that the coal powder gathers in the central area of ​​the primary air channel 1, and the primary air channel 1 forms a stratified combustion atmosphere with the central layer being coal powder and the outer layer being a mixture of air and ammonia. Therefore, in the initial stage of combustion, the coal powder is in a relatively oxygen-deficient state and the ammonia is in a relatively oxygen-rich state. At this time, ammonia burns in an oxygen-rich state to generate a large amount of nitrogen oxides, but because the total air volume delivered by the primary air is not enough to achieve complete combustion of ammonia, there will still be a large amount of residual ammonia in the primary air channel 1. The nitrogen oxides generated by the oxygen-rich combustion of ammonia and the unburned residual ammonia will undergo a reduction reaction in an oxygen-deficient environment to generate nitrogen, thereby significantly reducing the content of nitrogen oxides.

[0062] In a specific embodiment of the present application, the ammonia-coal mixed combustion burner may also include a secondary air channel sleeved on the outside of the primary air channel 1, and the secondary air channel is used to transport the secondary air. The outlet end of the secondary air channel and the outlet end of the primary air channel 1 are both provided with an adjustable nozzle 7, and the injection angle of the adjustable nozzle 7 is adjustable. When the ammonia-coal mixed combustion burner burns with a high ammonia mixing ratio, the nozzle angle of the adjustable nozzle 7 (i.e., the angle with the axis of the adjustable nozzle 7, i.e., the injection angle) can be increased so that the secondary air is ejected outward. The oxygen-enriched combustion of ammonia will generate nitrogen oxides and unburned residual ammonia. When nitrogen oxides, unburned residual ammonia and coal powder in the center flow downstream to the area of ​​the adjustable nozzle 7, since the injection angle of the adjustable nozzle 7 is adjusted to be larger, it is possible to avoid the sufficient oxygen in the secondary air from meeting the unburned ammonia too early, so that the unburned ammonia reacts with nitrogen oxides in an oxygen-deficient environment to generate nitrogen, thereby achieving a significant reduction in the nitrogen oxide content. In addition, increasing the voltage at the conductive ball 112 when the ammonia mixing ratio is high will also increase the pulverized coal temperature at the primary air channel 1 and enhance the flame stability.

[0063] like Figure 2 and Figure 4 As shown, in a specific embodiment of the present application, the adjustable nozzle 7 includes an inner layer adjustment plate 701, an outer layer adjustment plate 702 and an adjustment drive. Among them, one end of the inner layer adjustment plate 701 is a hinged end, so that it can swing along the hinged end. The hinged end of the inner layer adjustment plate 701 can be hinged at a corresponding position; for example, the adjustable nozzle 7 on the primary air channel 1, then the corresponding hinged end of the inner layer adjustment plate 701 is hinged to the outlet end of the primary air channel 1; the adjustable nozzle 7 on the secondary air channel, then the corresponding hinged end of the inner layer adjustment plate 701 is hinged to the outlet end of the secondary air channel.

[0064] There are multiple inner adjustment plates 701, which are arranged in a ring. By adjusting the inner adjustment plates 701 to swing along the hinged end, the spray angle of the adjustable nozzle 7 can be changed. For example, when the inner adjustment plates 701 swing away from the axial direction of the adjustable nozzle 7 (expanding the radius), the spray angle of the adjustable nozzle 7 will be increased; when the inner adjustment plates 701 swing toward the axial direction of the adjustable nozzle 7 (reducing the radius), the spray angle of the adjustable nozzle 7 will be reduced, thereby controlling the radius of air outflow.

[0065] In order to avoid mutual interference between two adjacent inner adjustment plates 701 when they swing inward, in this embodiment, there is an adjustable avoidance gap between any two adjacent inner adjustment plates 701, so that when the inner adjustment plate 701 swings to the minimum injection angle of the adjustable nozzle 7, there will be no interference between the two adjacent inner adjustment plates 701.

[0066] The outer adjustment plates 702 are multiple and arranged in a ring. The outer adjustment plates 702 are arranged on the outer ring of the inner adjustment plates 701 and cover the adjustment avoidance gap. The outer adjustment plates 702 are used to cover the adjustment avoidance gap between the inner adjustment plates 701 to prevent the secondary air from leaking outward through the adjustment avoidance gap.

[0067] One end of the outer layer adjustment plate 702 is a hinged end, so that it can swing along the hinged end. For example, the adjustable nozzle 7 on the primary air channel 1, then the corresponding hinged end of the outer layer adjustment plate 702 is hinged to the outlet end of the primary air channel 1; the adjustable nozzle 7 on the secondary air channel, then the corresponding hinged end of the outer layer adjustment plate 702 is hinged to the outlet end of the secondary air channel.

[0068] Each outer layer adjustment plate 702 is synchronously connected in transmission, so that when one of the outer layer adjustment plates 702 is driven to swing, the other outer layer adjustment plates 702 can swing synchronously in the same direction. For example, a pressure strip 703 can be fixedly set on the same side (such as the first side) of each outer layer adjustment plate 702, and the pressure strip 703 can be pressed on the second side (the side corresponding to the first side) of the adjacent outer layer adjustment plate 702. In this way, the pressure strip 703 on the first outer layer adjustment plate 702 is pressed on the second outer layer adjustment plate 702, and the pressure strip 703 on the second outer layer adjustment plate 702 is pressed on the third outer layer adjustment plate 702, and so on, which will not be repeated. In this way, each outer layer adjustment plate 702 can be linked under the action of the pressure strip 703.

[0069] It should be noted that, in order to realize each outer layer adjustment plate 702, it can also be realized through a gear mechanism, for example, a gear is set on the hinge shaft of the outer layer adjustment plate 702, and the gears are synchronously driven to realize linkage.

[0070] The adjusting drive member is used to drive the inner layer adjusting plate 701 and the outer layer adjusting plate 702 to swing inward and outward to adjust the spray angle of the adjustable nozzle 7. The adjusting drive member only needs to drive one of the outer layer adjusting plates 702 to move, so that the inner layer adjusting plate 701 and the outer layer adjusting plate 702 can swing synchronously.

[0071] In a specific embodiment of the present application, the adjustment drive member may include an inner elastic member (not shown in the figure), an outer elastic member (not shown in the figure) and a pressure plate assembly. The inner elastic member is used to drive the inner adjustment plate 701 to swing outward, and the outer elastic member is used to drive the outer adjustment plate 702 to swing outward (i.e., swing in the axial direction away from the adjustable nozzle 7). The inner elastic member can be a torsion spring mounted on the hinge shaft of the inner adjustment plate 701, and under the elastic action of the torsion spring, the outer adjustment plate 702 is driven to swing outward. It should be noted that the inner elastic member and the outer elastic member can also be other types of elastic members, as long as they can rely on the elastic action to drive the outer adjustment plate 702 and the inner adjustment plate 701 to swing outward.

[0072] The pressure plate assembly is used to press down the outer layer adjustment plate 702 to drive the outer layer adjustment plate 702 and the inner layer adjustment plate 701 to swing inward. That is, the pressure plate assembly presses the outer layer adjustment plate 702 so that the outer layer adjustment plate 702 cannot swing outward under the action of the outer layer elastic member. Since the outer layer adjustment plate 702 presses the inner layer adjustment plate 701, the inner layer adjustment plate 701 cannot swing outward under the action of the inner layer elastic member. When the outer layer adjustment plate 702 and the inner layer adjustment plate 701 need to swing inward, the pressure can be increased by the pressure plate assembly to press down the outer layer adjustment plate 702, so that the outer layer adjustment plate 702 overcomes the elastic force of the outer layer elastic member and swings inward, while pushing the inner layer adjustment plate 701 to swing inward.

[0073] The pressure plate assembly may include a rotating rod 705, a swinging pressure plate 706, a rotating rod elastic member and a pull rope 707. The rotating rod 705 of the primary air channel 1 is rotatably arranged on the primary air channel 1, and the rotating rod 705 of the secondary air channel is rotatably arranged on the secondary air channel. The rotating rod 705 may be supported on a supporting body 704, and the supporting body 704 is fixed on the corresponding primary air channel 1 / secondary air channel.

[0074] The swinging platen 706 is fixed to the rotating rod 705 so as to be driven to swing by the rotating rod 705. That is, the swinging platen 706 can be driven to swing by driving the rotating rod 705. Since the swinging platen 706 is pressed against the outer layer adjustment plate 702, the downward pressure acting on the outer layer adjustment plate 702 can be adjusted by driving the swinging platen 706 to swing, thereby adjusting the spray angles of the outer layer adjustment plate 702 and the inner layer adjustment plate 701.

[0075] The rotating rod elastic member is used to drive the rotating rod 705 to drive the swinging pressure plate 706 to press down the outer layer adjustment plate 702. The rotating rod elastic member can also be a torsion spring sleeved on the rotating rod 705. It can be understood by those skilled in the art that one elastic arm of the torsion spring can act on the frame (i.e., a fixed mechanism, such as the primary air channel 1 and the secondary air channel), and the other elastic arm can act on the swinging pressure plate 706, so that the elastic force of the torsion spring can act on the swinging pressure plate 706.

[0076] The pull rope 707 is wound around the rotating rod 705, and is used to drive the rotating rod 705 to drive the swinging pressure plate 706 to lift up, so that the outer layer adjustment plate 702 can swing outward. When the pull rope 707 is pulled, the friction between the pull rope 707 and the rotating rod 705 can drive the rotating rod 705 to rotate, and then drive the swinging pressure plate 706 to lift up, so that the outer layer adjustment plate 702 can swing outward.

[0077] The pulling end of the pull rope 707 should be located at a position convenient for the operator to operate. The pull rope 707 can also be wound on the rotating wheel. The operator can pull or release the pull rope 707 by rotating the rotating wheel, and then adjust the movement of the swing pressure plate 706. After the adjustment is completed, the rotation of the rotating wheel can be locked to achieve the fixing of the angle of the swing pressure plate 706. The rotating wheel can be fixed by a locking top screw, that is, the rotating wheel is supported by a bracket, and the locking top screw thread is engaged with the bracket. By rotating the locking top screw so that its top is pressed against the rotating wheel, the locking of the rotating wheel is achieved.

[0078] It should be noted that the rotating rod elastic member can drive the swinging pressure plate 706 to press down the outer layer adjustment plate 702, while the inner layer elastic member and the outer layer elastic member are used to drive the outer layer adjustment plate 702 and the inner layer adjustment plate 701 to swing outward. Therefore, the elastic force of the rotating rod elastic member needs to be greater than the elastic force of the inner layer elastic member and the outer layer elastic member, so that when there is no force from the pull rope 707, the swinging pressure plate 706 can press down the outer layer adjustment plate 702 and the inner layer adjustment plate 701 under the action of its rotating rod elastic member until the adjustable nozzle 7 is at the minimum spray angle.

[0079] Those skilled in the art will appreciate that the pull rope 707 may also be replaced by other components, such as a transmission mechanism, to drive the rotating rod 705 to rotate. The driving end of the transmission mechanism should be located outside the ammonia-coal mixed combustion burner to facilitate the operation of the operator.

[0080] In a specific embodiment of the present application, the secondary air channel includes an inner secondary air channel 2 (the inner secondary air flows between the inner secondary air channel 2 and the primary air channel 1) and an outer secondary air channel 3 (the outer secondary air flows between the inner secondary air channel 2 and the outer secondary air channel 3), the inner secondary air channel 2 is sleeved on the outer side of the primary air channel 1, and the outer secondary air channel 3 is sleeved on the outer side of the inner secondary air channel 2. Both the inner secondary air channel 2 and the outer secondary air channel 3 are provided with adjustable nozzles 7. A nozzle is formed between two adjacent adjustable nozzles 7. For example, an inner secondary air nozzle is formed between the primary air channel 1 and the adjustable nozzle 7 on the inner secondary air channel 2, and an outer secondary air nozzle is formed between the inner secondary air channel 2 and the adjustable nozzle 7 on the outer secondary air channel 3.

[0081] When the injection angle of the inner secondary air nozzle needs to be adjusted, the adjustable nozzles 7 on the primary air channel 1 and the inner secondary air channel 2 need to be adjusted synchronously; when the injection angle of the outer secondary air nozzle needs to be adjusted, the adjustable nozzles 7 on the inner secondary air channel 2 and the outer secondary air channel 3 need to be adjusted synchronously.

[0082] A secondary air deflection blade 11 is arranged in the secondary air channel. When the secondary air channel includes an inner secondary air channel 2 and an outer secondary air channel 3, the secondary air deflection blade 11 on the inner secondary air channel 2 can be arranged on the outer wall of the primary air channel 1, and of course, it can also be arranged on the inner wall of the inner secondary air channel 2; the secondary air deflection blade 11 on the outer secondary air channel 3 can be arranged on the outer wall of the inner secondary air channel 2, and of course, it can also be arranged on the inner wall of the outer secondary air channel 3.

[0083] The secondary air deflection blades 11 can deflect the secondary air so that the airflow discharged from the outlet end of the primary air channel 1 is wrapped by the rotating airflow discharged from the inner secondary air channel 2 and the outer secondary air channel 3, forming a multi-layer combustion organization mode in which the central layer is a swirl of the gas-powder mixture, the middle layer is a swirl of the mixture of ammonia and air, and the outer layer is an inner and outer secondary air swirl.

[0084] like Figure 3 and Figure 5 As shown, in a specific embodiment of the present application, the flow guide mechanism 10 may include a flow guide housing 101, and the two ends of the flow guide housing 101 are flow guide cones, and the outer diameter of the flow guide cone gradually increases from the end to the middle of the flow guide housing 101. The upstream flow guide cone can reduce wind resistance, and the downstream flow guide cone has a gathering effect on the airflow, so that the airflow converges to the center of the primary air channel 1. The flow guide mechanism 10 can be coaxially arranged with the primary air channel 1, and arranged on the same straight line as the nozzle 6. The conductive ball 112 is arranged at the end of the flow guide housing 101 away from the nozzle 6.

[0085] The concentrated combustion of coal powder at the nozzle of the ammonia-coal mixed combustion burner can easily cause the local flame temperature to be too high, change the combustion characteristics of ammonia, and make the metal wall temperature of the ammonia-coal mixed combustion burner exceed the allowable temperature, thus damaging the normal service life of the ammonia-coal mixed combustion burner.

[0086] Based on this, in this embodiment, the flow guiding mechanism 10 has a temperature regulating function, and the flow guiding mechanism 10 also includes a first magnet 104, a second magnet 105, a thrust elastic member 111 and a sliding resistance assembly. Among them, the first magnet 104 is fixed in the flow guiding housing 101, and the second magnet 105 is slidably matched in the flow guiding housing 101, and repels the first magnet 104, that is, the first magnet 104 and the second magnet 105 have the same magnetic pole facing each other, so that the two repel each other under the action of magnetic force.

[0087] The thrust elastic member 111 is disposed in the flow guide housing 101, and is used to push the second magnet 105 to move in a direction close to the first magnet 104, that is, the thrust of the thrust elastic member 111 on the second magnet 105 is opposite to the thrust of the first magnet 104 on the second magnet 105. That is, the position of the second magnet 105 is related to the thrust generated by the thrust elastic member 111 and the first magnet 104. Since the elastic force generated by the thrust elastic member 111 is not affected by temperature, while the magnetic force of the magnet is affected by temperature, the thrust generated by the first magnet 104 changes with the temperature change, thereby changing the position of the second magnet 105.

[0088] The sliding resistor assembly has two connection contacts 110, and the two connection contacts 110 are connected to the power supply circuit of the conductive ball 112. The sliding resistor assembly changes its resistance value as the second magnet 105 moves. The movement of the second magnet 105 will drive one of the connection contacts 110 to move, thereby changing the distance between the two connection contacts 110, that is, adjusting the resistance value of the sliding resistor assembly, so that the current of the conductive ball 112 changes, and thus adjusting the coal powder gathering ability of the conductive ball 112. When the temperature rises, the first magnet 104 and the second magnet 105 will produce a certain degree of thermal demagnetization. After the magnetism of the two is weakened, the thrust elastic member 111 pushes the second magnet 105 to move, so that the distance between the two connection contacts 110 becomes larger, so that the resistance of the sliding resistor assembly becomes larger, the current of the conductive ball 112 becomes smaller, and the coal powder gathering ability of the conductive ball 112 becomes weaker, thereby avoiding the concentrated combustion of coal powder, reducing the flame temperature at the burner outlet, and avoiding overheating at the burner outlet.

[0089] In this embodiment, the sliding resistor component may include a first conductive block 107 and a second conductive block 108 that are slidably matched. One of the two connecting contacts 110 is arranged on the first conductive block 107, and the other is arranged on the second conductive block 108. The relative sliding of the first conductive block 107 and the second conductive block 108 can change the distance between the two connecting contacts 110, thereby changing the resistance value.

[0090] The connection contact 110 on the second conductive block 108 can be connected to electricity through a wire, and the connection contact 110 on the first conductive block 107 is electrically connected to one terminal of the conductive ball 112, and the other terminal of the conductive ball 112 is connected to electricity. When in use, the second conductive block 108, the first conductive block 107, the conductive ball 112 and the power supply form a path, so that the conductive ball 112 is charged, and the adsorption capacity of the conductive ball 112 on coal powder can be controlled by actively controlling the voltage, so that the conductive ball 112 can pull the coal powder in the airflow that is originally gathered to the middle by the shape of the guide shell 101. When the concentrated combustion of coal powder causes the temperature to be too high, the current of the conductive ball 112 is reduced by moving the second magnet 105, and the ability of the conductive ball 112 to gather coal powder is reduced, thereby reducing the flame temperature at the burner outlet.

[0091] One of the first conductive block 107 and the second conductive block 108 is fixed in the flow guide housing 101, and the other is connected to the second magnet 105, and when the second magnet 105 moves toward the direction close to the first magnet 104, the two connection contacts 110 move away from each other. This embodiment is described by taking the first conductive block 107 connected to the second magnet 105 and the second conductive block 108 fixed to the flow guide housing 101 as an example.

[0092] In order to facilitate the connection between the first conductive block 107 and the second magnet 105, a connector 106 can be provided. The connector 106 is a non-conductor to prevent current from passing through the connector 106 and causing the ammonia-coal mixed combustion burner to be charged. The connector 106 is fixed to the second magnet 105, and the first conductive block 107 is fixed to the connector 106.

[0093] A sliding groove may be provided on the first conductive block 107, and one end of the second conductive block 108 is inserted into the sliding groove to slide with the first conductive block 107. A limiting rod 109 may be provided at one end of the second conductive block 108 located outside the sliding groove, and the limiting rod 109 may be provided between the first conductive block 107 and the connection contact 110 on the second conductive block 108. When the first conductive block 107 moves to the limit position in the direction of the second conductive block 108, it will be limited by the limiting rod 109 to prevent the second conductive block 108 from colliding with the connection contact 110 on the second conductive block 108, resulting in a circuit break.

[0094] The flow guiding mechanism 10 may further include a guide rod 102 and a fixing frame 103, wherein the fixing frame 103 and the guide rod 102 are both fixed in the flow guiding housing 101. For example, one end of the guide rod 102 may be fixed to the inner wall of the flow guiding housing 101 or the fixing frame 103, and the other end may be fixed to the first magnet 104.

[0095] The thrust elastic member 111 and the second magnet 105 are both sleeved on the guide rod 102, and one end of the thrust elastic member 111 abuts against the fixing frame 103, and the other end abuts against the second magnet 105. The thrust elastic member 111 may be a coil spring, sleeved on the guide rod 102, which can prevent the thrust elastic member 111 from bending after being stressed; the second magnet 105 is sleeved on the guide rod 102 and slides along the guide rod 102, which can make a gap between the second magnet 105 and the inner wall of the guide housing 101, prevent friction with the guide housing 101, reduce friction, and avoid the situation of being stuck due to excessive friction.

[0096] In a specific embodiment of the present application, the ammonia channel 4 is mixed with the central air through the central air channel 5. One end of the central air channel 5 is connected to the ammonia channel 4, and the other end extends outside the primary air channel 1. That is, the gas transported in the ammonia channel 4 is a mixture of ammonia and air to supplement oxygen for combustion.

[0097] A plurality of primary air deflection blades 9 are arranged on the outside of the guide mechanism 10. The ammonia inside the ammonia channel 4 is evenly released through the nozzle 6, and is driven by the air-powder airflow (mixed airflow of coal powder and primary air) inside the primary air channel 1 to be discharged downstream. During the discharge process, the guide cone on the downstream side of the guide shell 101 is converged, and due to the guidance of the primary air deflection blades 9, the airflow spirals forward.

[0098] A fixing ring 8 may be fixed to the outer side of the primary air deflecting blade 9 , that is, the inner end of each primary air deflecting blade 9 is fixed to the guide housing 101 , the outer end is fixed to the fixing ring 8 , and the fixing ring 8 is fixed to the inner wall of the primary air channel 1 .

[0099] In summary, the ammonia-coal mixed combustion burner disclosed in the embodiment of the present application can be suitable for ammonia-coal mixed combustion under different mixed ammonia ratios by adjusting the voltage at the conductive ball 112 of the device and the opening and closing angle of the nozzle at the adjustable nozzle 7.

[0100] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0101] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0102] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0103] Specific examples are used herein to illustrate the principles and implementation methods of the present application, and the description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. An ammonia-coal mixed combustion burner, characterized in that: include: A primary air channel (1) for conveying an air-powder mixture of primary air and coal powder; an ammonia channel (4) extending into the primary air channel (1) and used for conveying ammonia; one end of the ammonia channel (4) located in the primary air channel (1) is connected to a nozzle (6); The flow guiding mechanism (10) is arranged in the primary air channel (1) and is located downstream of the nozzle (6). The flow guiding mechanism (10) comprises a conductive ball (112). The conductive ball (112) can generate an adsorption force on coal powder after being energized.

2. The ammonia-coal mixed combustion burner according to claim 1, characterized in that: It also comprises a secondary air channel sleeved on the outside of the primary air channel (1), the secondary air channel being used to convey secondary air, the outlet end of the secondary air channel and the outlet end of the primary air channel (1) being both provided with adjustable nozzles (7), the spray angle of the adjustable nozzles (7) being adjustable.

3. The ammonia-coal mixed combustion burner according to claim 2, characterized in that: The adjustable nozzle (7) comprises: An inner layer adjustment plate (701), one end of the inner layer adjustment plate (701) being a hinged end so that it can swing along the hinged end, the inner layer adjustment plates (701) being multiple and arranged in a ring, and an adjustment avoidance gap being provided between any two adjacent inner layer adjustment plates (701); There are multiple outer adjustment plates (702) arranged in a ring shape, the outer adjustment plates (702) being arranged on the outer ring of the inner adjustment plates (701) and covering the adjustment avoidance gap, one end of the outer adjustment plates (702) being a hinged end so that the outer adjustment plates (702) can swing along the hinged end, and each of the outer adjustment plates (702) is synchronously connected by transmission; The adjusting drive member is used to drive the inner adjustment plate (701) and the outer adjustment plate (702) to swing inwards and outwards, so as to adjust the spray angle of the adjustable nozzle (7).

4. The ammonia-coal mixed combustion burner according to claim 3, characterized in that: The adjusting driving member comprises an inner elastic member, an outer elastic member and a pressing plate assembly; The inner elastic member is used to drive the inner adjustment plate (701) to swing outwards, and the outer elastic member is used to drive the outer adjustment plate (702) to swing outwards; The pressing plate assembly is used to press down the outer layer adjustment plate (702) to drive the outer layer adjustment plate (702) and the inner layer adjustment plate (701) to swing inwards.

5. The ammonia-coal mixed combustion burner according to claim 4, characterized in that: The pressure plate assembly comprises a rotating rod (705), a swinging pressure plate (706), a rotating rod elastic member and a pull rope (707); The rotating rod (705) of the primary air channel (1) is rotatably arranged on the primary air channel (1), and the rotating rod (705) of the secondary air channel is rotatably arranged on the secondary air channel; The swing pressure plate (706) is fixed to the rotating rod (705) so as to be driven by the rotating rod (705) to swing; The rotating rod elastic member is used to drive the rotating rod (705) to drive the swinging pressure plate (706) to press down the outer layer adjustment plate (702); the pull rope (707) is wound around the rotating rod (705) and is used to drive the rotating rod (705) to drive the swinging pressure plate (706) to lift up, so that the outer layer adjustment plate (702) swings outward.

6. The ammonia-coal mixed combustion burner according to claim 2, characterized in that: The secondary air channel comprises an inner secondary air channel (2) and an outer secondary air channel (3), wherein the inner secondary air channel (2) is sleeved on the outer side of the primary air channel (1), and the outer secondary air channel (3) is sleeved on the outer side of the inner secondary air channel (2); and / or, A secondary air deflection blade (11) is arranged in the secondary air channel.

7. The ammonia-coal mixed combustion burner according to claim 1, characterized in that: The flow guiding mechanism (10) comprises a flow guiding shell (101), both ends of the flow guiding shell (101) are flow guiding cones, and the outer diameter of the flow guiding cone gradually increases in a direction from the end to the middle of the flow guiding shell (101); The conductive ball (112) is arranged at an end of the flow guide housing (101) that is away from the nozzle (6).

8. The ammonia-coal mixed combustion burner according to claim 7, characterized in that: The flow guiding mechanism (10) further comprises: A first magnet (104) is fixed in the flow guide housing (101); A second magnet (105) is slidably fitted in the flow guide housing (101) and repels the first magnet (104); A thrust elastic member (111) is disposed in the flow guide housing (101) and is used to push the second magnet (105) to move in a direction close to the first magnet (104); A sliding resistor component has two connection contacts (110), wherein the two connection contacts (110) are connected to a power supply circuit of the conductive ball (112), and the resistance value of the sliding resistor component changes as the second magnet (105) moves.

9. The ammonia-coal mixed combustion burner according to claim 8, characterized in that: The sliding resistor assembly comprises a first conductive block (107) and a second conductive block (108) that are slidably matched, one of the two connecting contacts (110) being arranged on the first conductive block (107), and the other being arranged on the second conductive block (108); one of the first conductive block (107) and the second conductive block (108) being fixed in the flow guide housing (101), and the other being connected to the second magnet (105), and when the second magnet (105) moves in a direction approaching the first magnet (104), the two connecting contacts (110) move away from each other; and / or, The flow guide mechanism (10) further comprises a guide rod and a fixing frame (103); the fixing frame (103) and the guide rod are both fixed in the flow guide housing (101); the thrust elastic member (111) and the second magnet (105) are both sleeved on the guide rod; one end of the thrust elastic member (111) abuts against the fixing frame (103), and the other end abuts against the second magnet (105).

10. The ammonia-coal mixed combustion burner according to any one of claims 1 to 9, characterized in that: The ammonia channel (4) is mixed with central air through the central air channel (5); one end of the central air channel (5) is connected to the ammonia channel (4) and the other end extends outside the primary air channel (1); and / or, A plurality of primary air deflection blades (9) are arranged on the outer side of the flow guide mechanism (10); and / or, The nozzle (6) is a porous ceramic nozzle.

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