Pulverized coal ignition device

Abstract

The present invention discloses a pulverized coal ignition device, comprising: a cylinder body; an internal combustion cylinder disposed in the inner cavity of the cylinder body; a pulverized coal and air pipeline communicating with the inner cavity of the cylinder body; an ignition device including an ignition port; an auxiliary hot air and pulverized coal pipe including a pre-combustion pipe surrounding the ignition port and a mixing pipe communicating with the pre-combustion pipe; a pulverized coal pipe communicating with the mixing pipe and configured to convey pulverized coal to the mixing pipe when the pulverized coal ignition device is in ignition operation; a hot air device including a hot air pipe communicating with the mixing pipe, and the hot air device is configured to: convey hot air with a temperature higher than the temperature of the pulverized coal and air flow entering the internal combustion cylinder and lower than the ignition point of the pulverized coal and air flow to the mixing pipe when the pulverized coal ignition device is in ignition operation; wherein, the pulverized coal ignition device is configured to: when the pulverized coal ignition device is in ignition operation, the hot air entering the mixing pipe and the pulverized coal entering the mixing pipe are mixed in the mixing pipe, and after mixing, flow into the pre-combustion pipe and are ignited by the ignition port.

Description

Technical Field

[0001] The present invention relates to the field of pulverized coal combustion, and particularly to a pulverized coal ignition device. Background Art

[0002] The technology of saving oil in ignition of coal-fired boilers has been applied industrially in China for more than 20 years. Based on the accumulation of internal combustion ignition technology over the years, it is still necessary to deeply develop the technology of saving oil in ignition, which is of great significance for the continuous application and development of the technology of saving oil in ignition.

[0003] The oil-saving ignition burner is an internal combustion burner, and pulverized coal is directly ignited by an ignition source in the core ignition area of the internal combustion burner. The conditions for pulverized coal to be ignited and continuously burned are affected by multiple parameters such as appropriate wind speed, temperature, pulverized coal concentration, and initial energy for igniting pulverized coal. Before the pulverized coal contacts the ignition source in conventional internal combustion ignition, the temperature of the air-powder flow is the primary air temperature, and there is a large gap between this temperature and the ignition temperature of the pulverized coal air flow. Therefore, a relatively high ignition energy needs to be input when the ignition source ignites, and the range of coal quality suitable for ignition is narrow. Summary of the Invention

[0004] The purpose of the present invention is to provide a pulverized coal ignition device in which pulverized coal is easier to ignite and the range of coal quality suitable for ignition is wide.

[0005] The present invention discloses a pulverized coal ignition device, including:

[0006] A cylinder;

[0007] An internal combustion cylinder, disposed in the inner cavity of the cylinder;

[0008] An air-powder pipeline, communicating with the inner cavity of the cylinder, for conveying an air-powder flow to the internal combustion cylinder;

[0009] An ignition device, including an ignition port disposed in the cylinder for igniting the air-powder flow entering the internal combustion cylinder;

[0010] An auxiliary hot air-powder pipe, including a pre-combustion pipe surrounding the ignition port and a mixing pipe communicating with the pre-combustion pipe;

[0011] A pulverized coal pipe, communicating with the mixing pipe, and configured to convey pulverized coal to the mixing pipe when the pulverized coal ignition device is in ignition operation;

[0012] A hot air device, including a hot air pipe communicating with the mixing pipe, and the hot air device is configured to: convey hot air with a temperature higher than the temperature of the air-powder flow entering the internal combustion cylinder and lower than the ignition point temperature of the air-powder flow to the mixing pipe when the pulverized coal ignition device is in ignition operation;

[0013] Wherein, the pulverized coal ignition device is configured such that when the pulverized coal ignition device is in an ignition operation, the hot air entering the mixing pipe and the pulverized coal entering the mixing pipe are mixed in the mixing pipe, and after mixing, flow into the pre-combustion pipe and are ignited by the ignition port.

[0014] In some embodiments, the outlet of the pre-combustion pipe is provided at the inlet of the inner combustion cylinder or at the inlet end of the chamber of the inner combustion cylinder.

[0015] In some embodiments, the flow rate of the mixture of the hot air entering the mixing pipe and the pulverized coal entering the mixing pipe after mixing in the mixing pipe into the pre-combustion pipe is less than the flow rate of the air-powder flow entering the inner combustion cylinder.

[0016] In some embodiments, the hot air device is configured such that the temperature of the hot air input by the hot air device into the mixing pipe is 200 - 600 °C.

[0017] In some embodiments, the cylinder body includes a bent cylinder section. The air-powder pipeline is communicated with the inlet of the bent cylinder section. The pulverized coal pipe includes a powder collector disposed in the inner cavity of the bent cylinder section and a powder delivery pipe communicating the powder collector and the mixing pipe. The powder collector is disposed on one side close to the outer wall in the radial direction of the bent cylinder section between the inner wall and the outer wall in the radial direction of the bent cylinder section. The powder collector includes an opening facing the oncoming direction of the air-powder flow.

[0018] In some embodiments, the powder collector includes a gradually expanding inlet that expands gradually along the oncoming direction of the air-powder flow.

[0019] In some embodiments, the ignition device includes a linear ignition pipe. The ignition pipe includes the ignition port. The auxiliary hot air-powder pipe includes a linear air-powder pipe surrounding the ignition pipe. The air-powder pipe includes a hot air input pipe, the mixing pipe, and the pre-combustion pipe. The mixing pipe is located between the pre-combustion pipe and the hot air input pipe. The pulverized coal pipe is connected to the mixing pipe, and the hot air pipe is connected to the hot air input pipe.

[0020] In some embodiments, the pulverized coal pipe includes a powder collector disposed outside the cylinder body and a powder delivery pipe communicating the powder collector and the mixing pipe. The powder collector is communicated with the air-powder pipeline to collect the pulverized coal transported to the powder delivery pipe from the air-powder pipeline.

[0021] In some embodiments, the ignition device includes a linear ignition tube, the ignition tube includes the ignition port, the mixing tube includes a mixing inner tube section located in the inner cavity of the cylinder body and communicating with the pre-combustion tube, and a mixing outer tube section located outside the cylinder body. The auxiliary hot air and pulverized coal pipe further includes a hot air input pipe connected to the mixing outer tube section. The pulverized coal pipe includes a powder collector disposed outside the cylinder body and a powder conveying pipe communicating the powder collector and the mixing outer tube section. The powder collector is communicated with the air-powder pipeline to collect the pulverized coal conveyed to the powder conveying pipe from the air-powder pipeline. The hot air pipe is connected to the hot air input pipe.

[0022] In some embodiments, the ignition device includes a plasma generator, an oil gun or a gas gun.

[0023] In some embodiments, the hot air device is configured to output hot air from the first hot air outlet when the pulverized coal ignition device is operating.

[0024] Based on the pulverized coal ignition device provided by the present invention, by providing an auxiliary hot air and pulverized coal pipe, a pulverized coal pipe and a hot air device, pre-combustion is carried out in the pre-combustion tube after mixing with pulverized coal by using hot air with a temperature higher than the temperature of the air-powder gas flow entering the inner combustion cylinder and lower than its ignition point. The ignition source only needs to provide a small amount of energy to form combustion near the ignition source, increasing the ambient temperature near the ignition source, which can improve the ignition conditions of the air-powder gas flow in the main body part near the ignition source, making it easier for the main air-powder gas flow conveyed by the air-powder pipeline to the vicinity of the inner combustion cylinder to be ignited, reducing the ignition energy input by the ignition source, and expanding the range of coal quality that the pulverized coal ignition device can adapt to ignite.

[0025] Other features and advantages of the present invention will become clear from the following detailed description of the exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings described herein are used to provide a further understanding of the present invention and form a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 is a schematic structural diagram of the pulverized coal ignition device according to an embodiment of the present invention;

[0028] Figure 2 is a schematic structural diagram of the pulverized coal ignition device according to another embodiment of the present invention;

[0029] Figure 3 is a schematic structural diagram of the pulverized coal ignition device according to still another embodiment of the present invention;

[0030] Figure 4 is a schematic structural diagram of the pulverized coal ignition device according to still another embodiment of the present invention. Detailed implementation manners

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part rather than all of the embodiments of the present invention. The description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0032] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that for the sake of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0033] For the sake of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" and the like can be used here to describe the spatial positional relationship between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to cover different orientations in use or operation in addition to the orientation depicted in the drawings of the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0034] As Figures 1 to 4 shown, the pulverized coal ignition device of this embodiment includes a cylinder body 1, an internal combustion cylinder 2, a pulverized coal and air pipeline 3, an ignition device 4, an auxiliary hot air and pulverized coal pipe 5, a pulverized coal pipe and a hot air device.

[0035] The internal combustion cylinder 2 is arranged in the inner cavity of the cylinder body 1. The pulverized coal-air pipeline 3 is communicated with the inner cavity of the cylinder body 1, and the pulverized coal-air pipeline 3 is used for conveying the pulverized coal-air flow to the internal combustion cylinder 2.

[0036] The pulverized coal-air pipeline 3 is communicated with the inner cavity of the cylinder body 1, and the pulverized coal-air pipeline 3 is used for conveying the pulverized coal-air flow to the internal combustion cylinder 2; the pulverized coal-air pipeline 3 conveys the pulverized coal-air flow into the inner cavity of the cylinder body 1, and the pulverized coal-air flow is the mixed flow of air and pulverized coal. In the illustrated embodiment, the internal combustion cylinder 2 is connected to the inner wall of the cylinder body 1 through multiple brackets, and the internal combustion cylinder 2 is supported in the middle of the inner cavity of the cylinder body 1. Each bracket is distributed at intervals and is in a radial shape. When the pulverized coal-air flow passes through the internal combustion cylinder 2, a part of it enters the internal combustion cylinder 2, and the other part passes through the outside of the internal combustion cylinder 2. In some embodiments not shown in the figures, the connection between the internal combustion cylinder 2 and the cylinder body 1 is a sealed connection, and all the pulverized coal-air flow entering the inner cavity of the cylinder body 1 enters the internal combustion cylinder 2.

[0037] The ignition device 4 includes an ignition port 41 arranged in the cylinder body 1 for igniting the pulverized coal-air flow entering the internal combustion cylinder 2; the ignition port 41 is the outlet of the ignition device, and the ignition port 41 is the fire outlet for generating the flame 42.

[0038] The auxiliary hot pulverized coal-air pipe 5 includes a pre-combustion pipe 53 surrounding the ignition port 41 and a mixing pipe 52 communicated with the pre-combustion pipe 53. The pre-combustion pipe 53 surrounds the outside of the ignition port 41.

[0039] The pulverized coal pipe is communicated with the mixing pipe 52, and the pulverized coal pipe is configured to convey pulverized coal to the mixing pipe 52 when the pulverized coal ignition device ignites. The conveyance of the pulverized coal can be carried out by various methods such as gravity or air flow conveyance.

[0040] The hot air device includes a hot air pipe 7 communicated with the mixing pipe 52, and the hot air device is configured to: convey hot air with a temperature higher than the temperature of the pulverized coal-air flow entering the internal combustion cylinder 2 and lower than the ignition point temperature of the pulverized coal-air flow to the mixing pipe 52 when the pulverized coal ignition device ignites.

[0041] Wherein, the pulverized coal ignition device is configured to: when the pulverized coal ignition device ignites, the hot air entering the mixing pipe 52 and the pulverized coal entering the mixing pipe 52 are mixed in the mixing pipe 52, and after mixing, they flow into the pre-combustion pipe 53 and are ignited by the ignition port 41. The temperature of the arc or flame 42 output by the ignition port 41 is higher than the ignition point temperature of the pulverized coal-air flow for pre-combustion entering the pre-combustion pipe 53, so that the mixture can be ignited.

[0042] When the pulverized coal ignition device is igniting, after the hot air conveyed by the hot air device enters the mixing pipe, it will be mixed with the pulverized coal entering the mixing pipe 52 to form a pulverized coal-air mixture (or a pulverized coal-air flow including air), and the pulverized coal in the mixture is heated by the hot air. The pulverized coal-air flow conveyed by the pulverized coal-air pipe 3 into the cylinder is the main pulverized coal-air flow, accounting for the majority in volume, and the pulverized coal-air flow formed in the mixing pipe 52 is a small amount of pulverized coal-air flow, much less than the flow rate of the main pulverized coal-air flow. The temperature of the mixture formed in the mixing pipe 52 is higher than the temperature of the main pulverized coal-air flow entering the inner combustion cylinder and lower than its ignition point. Since the temperature of the mixture formed in the mixing pipe 52 is relatively high and the flow rate is small, when the mixture flows into the pre-combustion pipe, it is easily ignited by the ignition port 41. After the mixture is ignited, the main pulverized coal-air flow reaching near the ignition port 41 can be more easily ignited under the combined action of the mixture and the ignition device.

[0043] In the pulverized coal ignition device of this embodiment, by setting the auxiliary hot air-pulverized coal pipe 5, the pulverized coal pipe and the hot air device, pre-combustion is carried out in the pre-combustion pipe 53 after mixing with pulverized coal using hot air whose temperature is higher than the temperature of the pulverized coal-air flow entering the inner combustion cylinder 2 and lower than its ignition point. The ignition source only needs to provide a small amount of energy to form combustion near the ignition source, increasing the ambient temperature near the ignition source, which can improve the ignition conditions of the main part of the pulverized coal-air flow in the area near the ignition source, making it easier for the main pulverized coal-air flow conveyed by the pulverized coal-air pipe 3 to the vicinity of the inner combustion cylinder 2 to be ignited, reducing the ignition energy input by the ignition source, and expanding the range of coal quality that the pulverized coal ignition device can adapt to ignite. At the same time, since the hot air device of this embodiment outputs hot air with a temperature lower than the ignition point temperature of the pulverized coal-air flow, the hot air does not heat the hot air pipe 7 for conveying hot air and the mixing pipe 52 and other pipes to a temperature higher than the ignition point temperature of the pulverized coal-air flow, and the hot air pipe, the mixing pipe 52 and other pipes do not ignite the pulverized coal-air flow. When the ignition device is turned off, the hot air pipe, the mixing pipe 52 and other pipes also do not ignite the pulverized coal-air flow, making the pulverized coal-air flow can only be ignited by the ignition device, and the ignition of the pulverized coal-air flow is safer and more controllable, and the system has good safety. In addition, since the pulverized coal-air flow formed in the mixing pipe 52 for pre-combustion is a small-flow pulverized coal-air flow independent of the main pulverized coal-air flow, it is more convenient and reliable to control the temperature and flow rate of the small-flow pulverized coal-air flow.

[0044] In some embodiments, as Figures 1 to 4 shown, the output port of the pre-combustion pipe 53 is arranged at the entrance of the inner combustion cylinder 2 or the entrance end of the chamber of the inner combustion cylinder 2. As Figures 1 to 3 shown, the output port of the pre-combustion pipe 53 is arranged at the entrance end of the chamber of the inner combustion cylinder 2, that is, located in the upstream part in the chamber of the inner combustion cylinder 2. As Figure 4 shown in the embodiment, the output port of the pre-combustion pipe 53 is arranged at the entrance of the inner combustion cylinder 2, that is, located upstream of the inner combustion cylinder 2.

[0045] In some embodiments, the flow rate of the mixture of hot air entering the mixing pipe 52 and pulverized coal entering the mixing pipe 52 after mixing in the mixing pipe 52 into the pre-combustion pipe 53 is less than the flow rate of the air-powder flow entering the internal combustion cylinder 2.

[0046] In some embodiments, the hot air device is configured such that the temperature of the hot air input into the mixing pipe 52 by the hot air device is 200 - 600 °C.

[0047] In some embodiments, as Figure 1 shown, the cylindrical body 1 includes a bent cylinder section 11. The air-powder pipeline 3 is communicated with the inlet of the bent cylinder section 11. The pulverized coal pipe includes a powder collector 61 disposed in the inner cavity of the bent cylinder section 11 and a powder conveying pipe 62 communicating the powder collector 61 and the mixing pipe 52. The powder collector 61 is disposed on one side close to the outer cylindrical wall in the radial direction of the bent cylinder section 11 between the inner cylindrical wall and the outer cylindrical wall in the radial direction of the bent cylinder section 11. The powder collector 61 includes an opening facing the oncoming direction of the air-powder flow. As shown in Figure 1, the powder collector opening 611 is located on the side where the inner wall of the bent cylinder section 11 close to the outer side in the radial direction is located. Under the action of the bent cylinder section 11, the pulverized coal in the air-powder flow will gather on one side of the inner wall on the outer side in the radial direction of the bent cylinder section 11, forming concentration difference separation. By disposing the powder collector here, the pulverized coal with a higher concentration enters the powder collector through the powder collector opening 611, which is more conducive to the combustion of the air-powder flow entering the pre-combustion pipe 53.

[0048] In some embodiments, as Figure 1 shown, the powder collector includes a gradually expanding inlet along the oncoming direction of the air-powder flow. That is, the cross-sectional area of the inlet of the powder collector gradually increases along the flow direction of the air-powder flow. This setting helps to reduce the interference of the powder collector on the flow of the main air-powder flow. At the same time, the flow resistance of the pulverized coal entering the powder collector is smaller when flowing into the mixing pipe 52, and it is easier to pass through the powder conveying pipe 62.

[0049] In some embodiments, as Figure 1 shown, the ignition device 4 includes a linear ignition pipe. The ignition pipe includes an ignition port 41. The auxiliary air-powder pipe 5 includes a linear air-powder pipe surrounding the ignition pipe. The air-powder pipe includes a hot air input pipe 51, a mixing pipe 52 and a pre-combustion pipe. The mixing pipe 52 is located between the pre-combustion pipe 53 and the hot air input pipe 51. The pulverized coal pipe is connected to the mixing pipe 52, and the hot air pipe 7 is connected to the hot air input pipe 51. The hot air pipe 7 inputs hot air through the hot air input pipe 51, and then the hot air flows into the mixing pipe 52 from the hot air input pipe 51 to mix with the pulverized coal entering the mixing pipe 52.

[0050] In some embodiments, the pulverized coal pipe includes a powder collector 61 disposed outside the cylindrical body 1 and a powder conveying pipe 62 communicating the powder collector 61 and the mixing pipe 52. As Figures 2 to 4As shown, the powder collector 61 is connected to the pulverized coal-air pipeline 3 to collect the pulverized coal conveyed to the powder delivery pipe 62 from the pulverized coal-air pipeline 3. The powder collector 61 in this embodiment is arranged outside the cylinder body 1 and collects the pulverized coal from the devices outside the cylinder body 1. In the embodiment as Figures 2 to 4 shown, the powder collector collects the pulverized coal from the outer pipeline 8 of the cylinder body. In some embodiments, the pulverized coal-air pipeline 3 includes the outer pipeline 8 of the cylinder body, that is, the outer pipeline 8 of the cylinder body is the pipeline for conveying the main pulverized coal-air flow into the cylinder body 1. In this embodiment, collecting the pulverized coal from the main pulverized coal-air flow can conveniently realize pre-combustion in the pre-combustion pipe. The powder collector can collect the pulverized coal-air flow with the same pulverized coal concentration as the pulverized coal-air flow flowing in the pulverized coal-air pipeline 3, or can also collect it after the pulverized coal concentration is increased. The powder collector can be provided with devices such as baffles for enriching the pulverized coal, or can also adopt a suction device with a power source, etc.

[0051] In some embodiments, as Figure 3 and Figure 4 shown, the ignition device 4 includes a linear ignition pipe. The ignition pipe includes an ignition port 41. The mixing pipe 52 includes a mixing inner pipe section located in the inner cavity of the cylinder body 1 and communicating with the pre-combustion pipe 53, and a mixing outer pipe section located outside the cylinder body 1. The auxiliary hot air pulverized coal pipe 5 further includes a hot air input pipe 51 connected to the mixing outer pipe section. The pulverized coal pipe includes a powder collector 61 arranged outside the cylinder body 1 and a powder delivery pipe 62 connecting the powder collector 61 and the mixing outer pipe section. The powder collector 61 is connected to the pulverized coal-air pipeline 3 to collect the pulverized coal conveyed to the powder delivery pipe 62 from the pulverized coal-air pipeline 3. The hot air pipe 7 is connected to the hot air input pipe 51.

[0052] In some embodiments, the ignition device 4 includes a plasma generator, an oil gun or a gas gun.

[0053] In some embodiments, the hot air device is configured to: output hot air from the first hot air outlet when the pulverized coal ignition device is working.

[0054] In some embodiments, the hot air device includes a pipeline for air to enter and a heating device for heating the entering air. The heating device can include an electric heating device, a steam heating device or a flue gas heating device, etc. The heating device further includes a temperature control device. The air output from the pipeline after being heated and controlled by the temperature control device forms the hot air in the above embodiments.

[0055] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: still can modify the specific implementation manners of the present invention or make equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered by the scope of the technical solutions claimed by the present invention.

Claims

1. A pulverized coal ignition device, characterized in that, Comprising: A cylinder body (1); An internal combustion cylinder (2) disposed in the inner cavity of the cylinder body (1); A pulverized coal-air pipeline (3) communicating with the inner cavity of the cylinder body (1) for conveying a pulverized coal-air flow to the internal combustion cylinder (2); An ignition device (4) including an ignition port (41) disposed in the cylinder body (1) for igniting the pulverized coal-air flow entering the internal combustion cylinder (2); An auxiliary hot pulverized coal-air pipe (5) including a pre-combustion pipe (53) surrounding the ignition port (41) and a mixing pipe (52) communicating with the pre-combustion pipe (53), and an output port of the pre-combustion pipe (53) is disposed at an inlet of the internal combustion cylinder (2) or an inlet end of a chamber of the internal combustion cylinder (2); A pulverized coal pipe communicating with the mixing pipe (52) and configured to convey pulverized coal to the mixing pipe (52) when the pulverized coal ignition device is in ignition operation; A hot air device including a hot air pipe (7) communicating with the mixing pipe (52), and the hot air device is configured to: convey hot air with a temperature greater than the temperature of the pulverized coal-air flow entering the internal combustion cylinder (2) and less than the ignition point temperature of the pulverized coal-air flow to the mixing pipe (52) when the pulverized coal ignition device is in ignition operation; Wherein, the pulverized coal ignition device is configured to: when the pulverized coal ignition device is in ignition operation, the hot air entering the mixing pipe (52) and the pulverized coal entering the mixing pipe (52) are mixed in the mixing pipe (52), and after mixing, flow into the pre-combustion pipe (53) and are ignited by the ignition port (41), and the flow rate of the mixture of the hot air entering the mixing pipe (52) and the pulverized coal entering the mixing pipe (52) after mixing in the mixing pipe (52) flowing into the pre-combustion pipe (53) is less than the flow rate of the pulverized coal-air flow entering the internal combustion cylinder (2).

2. The pulverized coal ignition device according to claim 1, characterized in that, The hot air device is configured to: the temperature of the hot air input by the hot air device into the mixing pipe (52) is 200~600°C.

3. The pulverized coal ignition device according to claim 1, characterized in that, The cylinder body (1) includes a bent cylinder section (11), the pulverized coal-air pipeline (3) communicates with an inlet of the bent cylinder section (11), the pulverized coal pipe includes a powder collector (61) disposed in the inner cavity of the bent cylinder section (11) and a powder conveying pipe (62) connecting the powder collector (61) and the mixing pipe (52), and the powder collector (61) is disposed on a side close to the outer wall in the radial direction of the bent cylinder section (11) between the inner wall and the outer wall in the radial direction of the bent cylinder section (11), and the powder collector (61) includes an opening facing the incoming direction of the pulverized coal-air flow.

4. The pulverized coal ignition device according to claim 3, characterized in that, The powder collector (61) includes a gradually expanding inlet that expands gradually along the incoming direction of the pulverized coal-air flow.

5. The pulverized coal ignition device according to claim 1, characterized in that, The ignition device (4) includes a linear ignition tube, the ignition tube includes the ignition port (41), the auxiliary hot air powder pipe (5) includes a linear air powder pipe surrounding the ignition tube, the air powder pipe includes a hot air input pipe (51), the mixing pipe (52) and the pre-combustion pipe (53), the mixing pipe (52) is located between the pre-combustion pipe (53) and the hot air input pipe (51), the coal powder pipe is connected to the mixing pipe (52), and the hot air pipe (7) is connected to the hot air input pipe (51).

6. The pulverized coal ignition device according to claim 5, characterized in that, The coal powder pipe includes a powder collector (61) provided outside the cylinder body (1) and a powder conveying pipe (62) connecting the powder collector (61) and the mixing pipe (52), and the powder collector (61) is communicated with the air powder pipeline (3) to collect the coal powder conveyed to the powder conveying pipe (62) from the air powder pipeline (3).

7. The pulverized coal ignition device according to claim 1, characterized in that, The ignition device (4) includes a linear ignition tube, the ignition tube includes the ignition port (41), the mixing pipe (52) includes a mixing inner pipe section located in the inner cavity of the cylinder body (1) and communicated with the pre-combustion pipe (53) and a mixing outer pipe section located outside the cylinder body (1), the auxiliary hot air powder pipe (5) further includes a hot air input pipe (51) connected to the mixing outer pipe section, the coal powder pipe includes a powder collector (61) provided outside the cylinder body (1) and a powder conveying pipe (62) connecting the powder collector (61) and the mixing outer pipe section, the powder collector (61) is communicated with the air powder pipeline (3) to collect the coal powder conveyed to the powder conveying pipe (62) from the air powder pipeline (3), and the hot air pipe (7) is connected to the hot air input pipe (51).

8. The pulverized coal ignition device according to any one of claims 1 to 7, characterized in that The ignition device (4) includes a plasma generator, an oil gun or a gas gun.

9. The pulverized coal ignition device according to any one of claims 1 to 7, characterized in that, The hot air device is configured to: when the coal powder ignition device is working, output hot air from the output port of the hot air pipe.

Images