Pulverized coal ignition device

Abstract

The present invention discloses a coal powder ignition device, comprising: a cylinder; an internal combustion cylinder, arranged in the inner cavity of the cylinder; an air-powder channel, connected to the inner cavity of the cylinder, for conveying an air flow of air and powder to the internal combustion cylinder; an ignition device, comprising an ignition source arranged at the inlet of the internal combustion cylinder or the inlet end of the chamber of the internal combustion cylinder; a hot air device, comprising at least one first hot air outlet, the at least one first hot air outlet being arranged at the inlet of the internal combustion cylinder, in the chamber of the internal combustion cylinder and / or at the outlet of the internal combustion cylinder, the hot air device being configured to: when the coal powder ignition device is working, output hot air from the first hot air outlet, the temperature of the hot air being greater than the temperature of the air-powder air flow entering the internal combustion cylinder and less than the temperature of the ignition point of the air-powder air flow.

Description

Technical Field

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

[0002] The fuel-saving ignition technology for coal-fired boilers has been used in domestic industry for more than 20 years. Based on years of accumulation of internal combustion ignition technology, the fuel-saving ignition technology still needs to be deeply developed, which is of great significance to the continued application and development of the fuel-saving ignition technology.

[0003] Fuel-saving pilot burners are internal combustion burners, where pulverized coal is ignited directly by an ignition source within the burner's core ignition zone. The ignition and sustained combustion of pulverized coal requires the influence of multiple parameters, including appropriate air velocity, temperature, pulverized coal concentration, and initial ignition energy. Conventional internal combustion ignition uses the primary air temperature before the pulverized coal contacts the ignition source. This temperature is significantly lower than the ignition temperature of the pulverized coal airflow, requiring a higher ignition energy input from the ignition source to achieve ignition, and the range of coal qualities that can be ignited is narrow. Summary of the Invention

[0004] The object of the present invention is to provide a pulverized coal ignition device which is easier to ignite and can be adapted to ignite a wide range of coal qualities.

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

[0006] Cylinder;

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

[0008] an air-powder channel, connected to the inner cavity of the cylinder, for conveying an air-powder airflow to the internal combustion cylinder;

[0009] an ignition device comprising an ignition source disposed at the inlet of the internal combustion cylinder or at the inlet end of the chamber of the internal combustion cylinder;

[0010] The hot air device includes at least one first hot air outlet, and the at least one first hot air outlet is arranged at the inlet of the internal combustion cylinder, in the chamber of the internal combustion cylinder and / or at the outlet of the internal combustion cylinder. The hot air device is configured to output hot air from the first hot air outlet when the pulverized coal ignition device is working, and the temperature of the hot air is greater than the temperature of the air-powder airflow entering the internal combustion cylinder and less than the temperature of the ignition point of the air-powder airflow.

[0011] In some embodiments, the hot air device also includes a second hot air outlet provided at the outlet end of the cylinder, and the hot air device is configured to output hot air from the second hot air outlet when the pulverized coal ignition device is working, and the temperature of the hot air is greater than the temperature of the air-powder airflow entering the internal combustion cylinder and lower than the temperature of the ignition point of the air-powder airflow.

[0012] In some embodiments, the hot air device includes a plurality of first hot air outlets, and the plurality of first hot air outlets are evenly arranged circumferentially around the axis of the internal combustion cylinder.

[0013] In some embodiments, the hot air device is configured such that the temperature of the hot air outputted from the first hot air outlet is 200-600°C.

[0014] In some embodiments, the first hot air outlet faces downstream along the flow direction of the air-powder airflow in the cylinder.

[0015] In some embodiments, the hot air device is configured such that the angle between the wind direction of the hot air outputted from the first hot air outlet and the axis of the cylinder is 0 to 60°.

[0016] In some embodiments, the hot air device includes multiple first hot air outlets, a hot air main duct and multiple hot air branch ducts respectively connecting the first hot air outlets and the hot air main ducts. The hot air main duct and / or the hot air branch duct are provided with a flow control valve for controlling the hot air volume of the corresponding duct.

[0017] In some embodiments, the hot air device includes multiple first hot air outlets, a hot air main duct and multiple hot air branch ducts respectively connecting the first hot air outlets and the hot air main duct. The hot air main duct and / or the hot air branch duct are provided with a temperature regulator for adjusting the hot air temperature in the corresponding duct.

[0018] In some embodiments, the ignition device includes a plasma generator, an oil gun, or a gas gun.

[0019] In some embodiments, the hot air device is configured to output a hot air powder flow or hot air from the first hot air outlet when the pulverized coal ignition device is in operation.

[0020] Based on the pulverized coal ignition device provided by the present invention, a first hot air outlet is set at the inlet of the internal combustion cylinder, in the chamber of the internal combustion cylinder and / or at the outlet of the internal combustion cylinder, and hot air with a temperature greater than the air-powder airflow temperature and less than the ignition point temperature of the air-powder airflow is output from the first hot air outlet. This can improve the ignition conditions of the air-powder airflow in the ignition area, reduce the ignition energy input by the ignition source, and increase the range of coal quality that the pulverized coal ignition device can adapt to ignition.

[0021] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary 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:

[0023] Figure 1 This is a schematic structural diagram of a pulverized coal ignition device according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic structural diagram of a pulverized coal ignition device according to another embodiment of the present invention;

[0025] Figure 3 This is a schematic structural diagram of a pulverized coal ignition device according to another embodiment of the present invention;

[0026] Figure 4 This is a schematic structural diagram of a pulverized coal ignition device according to another embodiment of the present invention;

[0027] Figure 5 This is a schematic structural diagram of a pulverized coal ignition device according to another embodiment of the present invention;

[0028] Figure 6 This is a structural schematic diagram of a pulverized coal ignition device according to another embodiment of the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical 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 ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0031] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0032] like Figures 1 to 6 As shown, the pulverized coal ignition device of this embodiment includes a cylinder 1, an internal combustion cylinder 2, an air-powder channel 3, an ignition device 4 and a hot air device.

[0033] The internal combustion cylinder 2 is arranged in the inner cavity of the cylinder body 1. The air-powder channel 3 is communicated with the inner cavity of the cylinder body 1, and the air-powder channel 3 is used to convey the air-powder airflow to the internal combustion cylinder 2.

[0034] The air-powder passage 3 delivers an air-powder flow, i.e., a mixture of air and coal powder, into the inner cavity of the cylinder 1. In the embodiment shown in the figure, the internal combustion cylinder 2 is connected to the inner wall of the cylinder 1 via multiple brackets, which support the internal combustion cylinder 2 in the middle of the inner cavity of the cylinder 1. The brackets are spaced apart and arranged in a radial pattern. When the air-powder flow passes through the internal combustion cylinder 2, a portion enters the internal combustion cylinder 2, while the other portion passes from the outside of the internal combustion cylinder 2. In some embodiments not shown in the figure, the connection between the internal combustion cylinder 2 and the cylinder 1 is a sealed connection, and the air-powder flow entering the inner cavity of the cylinder 1 all enters the internal combustion cylinder 2.

[0035] The ignition device 4 includes an ignition source 41 provided at the entrance of the internal combustion cylinder 2 or the entrance end of the chamber of the internal combustion cylinder 2. The ignition source 41 is the outlet of the ignition device and is a fire outlet for generating a flame 42, such as Figure 1 In the embodiment shown, the ignition source 41 is located at the entrance of the internal combustion cylinder 2, upstream of the internal combustion cylinder 2, as shown in FIG. Figure 2 In the embodiment of the present invention, the ignition source 41 is located at the inlet end of the chamber of the internal combustion cylinder 2, that is, at the upstream portion of the chamber of the internal combustion cylinder 2. The ignition source 41 is used to generate a flame 42 to ignite the nearby air-powder airflow.

[0036] The hot air device includes at least one first hot air outlet 51, which is provided at the inlet of the internal combustion cylinder 2, in the chamber of the internal combustion cylinder 2 and / or at the outlet of the internal combustion cylinder 2. Figure 1 As shown, only the first hot air outlet 51 is provided at the inlet of the internal combustion cylinder 2. Figure 3 As shown, the first hot air outlet 51 is only provided in the chamber of the internal combustion cylinder 2, or the first hot air outlet 51 is only provided at the outlet of the internal combustion cylinder 2, or the first hot air outlet 51 is provided at the inlet of the internal combustion cylinder 2, in the chamber of the internal combustion cylinder 2 and at the outlet of the internal combustion cylinder 2, or the first hot air outlet 51 is provided at two of the three places: the inlet of the internal combustion cylinder 2, the chamber of the internal combustion cylinder 2 and the outlet of the internal combustion cylinder 2.

[0037] The hot air device is configured such that, when the pulverized coal ignition device is operating, hot air is output from the first hot air outlet 51. The hot air has a temperature greater than that of the air-powder airflow entering the internal combustion cylinder 2 and less than the ignition point of the air-powder airflow. In other words, the hot air is sufficiently hot to heat the air-powder airflow entering the internal combustion cylinder 2, while being below the ignition point of the air-powder airflow to prevent ignition.

[0038] When the first hot air outlet is set at the entrance of the internal combustion cylinder 2 or in the chamber of the internal combustion cylinder 2, hot air can be delivered to the air-powder airflow near the ignition source, improving the ignition conditions of the air-powder airflow in the ignition area, reducing the ignition energy input by the ignition source 41, and increasing the range of coal quality that the coal powder ignition device can adapt to ignition. When the first hot air outlet is set at the outlet of the internal combustion cylinder 2, the unignited air-powder airflow at the outlet of the internal combustion cylinder 2 can be heated by the hot air and can be more easily ignited by the air-powder airflow ignited upstream. Because the hot air output from the first hot air outlet 51 in this embodiment has a temperature lower than the ignition point temperature of the air-powder airflow, the hot air cannot heat the pipe that transports the hot air to a temperature higher than the ignition point temperature of the air-powder airflow, the hot air pipe will not ignite the air-powder airflow, and when the ignition source is turned off, the hot air cannot ignite the air-powder airflow, so that the air-powder airflow can only be ignited by the ignition source, the ignition of the air-powder airflow is safer and more controllable, and the system safety is good.

[0039] In some embodiments, as Figure 6 As shown, the hot air device further includes a second hot air outlet 54 provided at the outlet end of the cylinder 1. The hot air device is configured such that, when the pulverized coal ignition device is operating, hot air is output from the second hot air outlet 54. The hot air has a temperature greater than that of the air-powder airflow entering the internal combustion cylinder 2 and less than the ignition point of the air-powder airflow. In this embodiment, by providing the second hot air outlet 54, after the core combustion of the internal combustion cylinder 1 has occurred, the unignited air-powder airflow near the outlet of the cylinder 1 can be heated by the hot air output from the second hot air outlet 54, thereby making it easier to ignite.

[0040] In some embodiments, as Figures 1 to 6As shown, the hot air device includes a plurality of first hot air outlets 51, which are evenly arranged circumferentially around the axis of the internal combustion cylinder 2. That is, when the first hot air outlets 51 provided at the inlet of the internal combustion cylinder 2 or the inlet end or outlet of the chamber are multiple first hot air outlets 51 evenly arranged along the circumference, the hot air output by this arrangement can be more uniform, thereby improving the heating effect on the air-powder airflow.

[0041] In some embodiments, the hot air device is configured such that the temperature of the hot air outputted from the first hot air outlet 51 is 200-600°C.

[0042] In some embodiments, the first hot air outlet 51 faces downstream along the flow direction of the air-powder airflow in the cylinder 1. This arrangement helps the flame generated by the air-powder airflow to develop downstream, thereby improving the combustion effect.

[0043] In some embodiments, the hot air device is configured such that the angle between the hot air outputted from the first hot air outlet 51 and the axis of the cylinder 1 is 0-60 degrees. This angle helps the flame generated by the air-powder flow to develop downstream, improving the combustion effect.

[0044] In some embodiments, the hot air device includes a plurality of first hot air outlets 51, a hot air main pipe, and a plurality of hot air branch pipes respectively connected to the first hot air outlets 51 and the hot air main pipe. The hot air main pipe and / or the hot air branch pipe are provided with a flow control valve 53 for controlling the hot air volume of the corresponding pipe. Figure 6 As shown, flow control valves are provided on the main pipeline and each hot air branch pipeline. The flow control valve 53 is provided on the main pipeline, which can uniformly control and adjust the hot air flow of each hot air branch pipeline, and uniformly adjust the flow of hot air output from the first hot air outlet 51. The flow control valve 53 is provided on each hot air branch pipeline, which can individually control and adjust the hot air flow of each hot air branch pipeline, so that the flow of hot air output from the first hot air outlet 51 of different hot air branch pipelines is different. This embodiment can achieve the adjustment of the flow rate of hot air output, thereby adjusting the combustion effect of the air-powder airflow. By outputting hot air of different flow rates through each first hot air outlet 51, the combustion state of the air-powder airflow and the distribution of the combustion effect can also be adjusted.

[0045] In some embodiments, the hot air device includes a plurality of first hot air outlets 51, a hot air main pipe, and a plurality of hot air branch pipes respectively connected to the first hot air outlets 51 and the hot air main pipe. The hot air main pipe and / or the hot air branch pipe are provided with a temperature regulator 52 for regulating the hot air temperature in the corresponding pipe. Figure 5 As shown in FIG. 5 , a temperature regulator 52 is provided on the main pipeline. Figure 4As shown, temperature regulators 52 are provided on both the main duct and each hot air branch duct. The temperature regulator 52 provided on the main duct can uniformly control and adjust the hot air temperature of each hot air branch duct, and uniformly adjust the temperature of the hot air output from the first hot air outlet 51. The temperature regulator 52 provided on each hot air branch duct can individually control and adjust the hot air temperature of each hot air branch duct, so that the temperature of the hot air output from the first hot air outlet 51 of different hot air branch ducts is different. This embodiment can adjust the temperature of the hot air output, thereby adjusting the combustion effect of the air-powder airflow. By outputting hot air of different flow rates through each first hot air outlet 51, the combustion state of the air-powder airflow and the distribution of the combustion effect can also be adjusted.

[0046] In some embodiments, the ignition device 4 includes a plasma generator, an oil gun, or a gas gun, so that the corresponding flame 42 is a plasma arc, an oil flame, or a gas flame.

[0047] In some embodiments, the temperature regulator 52 may be an electric heating device, a steam heating device, a flue gas heating device, or the like.

[0048] In some embodiments, the hot air device is configured to: when the pulverized coal ignition device is operating, output a hot air flow or hot air from the first hot air outlet 51. In some other embodiments, the hot air may also come from oxygen, rare gas, etc.

[0049] 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 the present invention. Although the present invention has been described in detail with reference to preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solutions of the present invention. They should all be included in the scope of the technical solutions claimed for protection by the present invention.

Claims

1. A pulverized coal ignition device, characterized in that: include: Cylinder (1); An internal combustion cylinder (2) is disposed in the inner cavity of the cylinder (1); An air-powder channel (3) is communicated with the inner cavity of the cylinder (1) and is used to convey an air-powder airflow to the internal combustion cylinder (2); An ignition device (4) comprising an ignition source (41) provided at the entrance of the internal combustion cylinder (2) or at the entrance end of the chamber of the internal combustion cylinder (2); The hot air device comprises at least one first hot air outlet (51), the at least one first hot air outlet (51) being arranged at the inlet of the internal combustion cylinder (2), and the hot air device being configured to: when the pulverized coal ignition device is working, output hot air from the first hot air outlet (51), the temperature of the hot air being greater than the temperature of the air-powder airflow entering the internal combustion cylinder (2) and less than the temperature of the ignition point of the air-powder airflow; the hot air device also comprises a second hot air outlet (54) being arranged at the outlet end of the cylinder (1), and the hot air device being configured to: when the pulverized coal ignition device is working, output hot air from the second hot air outlet (54), the temperature of the hot air being greater than the temperature of the air-powder airflow entering the internal combustion cylinder (2) and less than the temperature of the ignition point of the air-powder airflow; the first hot air outlet (51) is oriented downstream along the flow direction of the air-powder airflow in the cylinder (1), and when the pulverized coal ignition device is working, output hot air from the first hot air outlet (51).

2. The pulverized coal ignition device according to claim 1, characterized in that: The hot air device comprises a plurality of first hot air outlets (51), and the plurality of first hot air outlets (51) are uniformly arranged circumferentially around the axis of the internal combustion cylinder (2).

3. The pulverized coal ignition device according to claim 1, characterized in that: The hot air device is configured such that the temperature of the hot air outputted from the first hot air outlet (51) is 200-600°C.

4. The pulverized coal ignition device according to claim 1, characterized in that: The hot air device is configured such that the angle between the direction of the hot air outputted from the first hot air outlet (51) and the axis of the cylinder (1) is 0-60°C.

5. The pulverized coal ignition device according to claim 1, characterized in that: The hot air device comprises a plurality of first hot air outlets (51), a hot air main pipe and a plurality of hot air branch pipes respectively connected to the first hot air outlets (51) and the hot air main pipe, and a flow control valve (53) for controlling the hot air volume of the corresponding pipe is provided on the hot air main pipe and / or the hot air branch pipe.

6. The pulverized coal ignition device according to claim 1, characterized in that: The hot air device comprises a plurality of first hot air outlets (51), a hot air main duct, and a plurality of hot air branch ducts respectively connected to the first hot air outlets (51) and the hot air main duct, and a temperature regulator (52) for regulating the hot air temperature in the corresponding duct is provided on the hot air main duct and / or the hot air branch duct.

7. The pulverized coal ignition device according to any one of claims 1 to 6, characterized in that: The ignition device (4) comprises a plasma generator, a fuel oil gun or a gas gun.

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