Continuous ignition control system for boiler

Abstract

The continuous ignition control system for the boiler comprises a main air pipeline, an ignition air pipeline, a main fuel gas pipeline and an ignition fuel gas pipeline, the air inlet end of the ignition air pipeline is connected with an ignition air source, the air outlet end of the ignition air pipeline communicates with an ignition burner of the boiler, and the main fuel gas pipeline is connected with the ignition fuel gas pipeline. The frequency converter of the ignition air source is in communication connection with a controller of the boiler, so that the controller can adjust the air supply frequency of the ignition air source according to the operation state of the boiler; the gas inlet end of the ignition gas pipeline is communicated with a gas supply source, and the gas outlet end of the ignition gas pipeline is communicated to an ignition burner of the boiler; a pressure equalizing valve is connected between the ignition air pipeline and the ignition fuel gas pipeline, the output flow of ignition fuel gas is automatically adjusted through the pressure change of ignition air, and it is guaranteed that continuous ignition flames of the boiler can maintain normal combustion under the working conditions of different output heat powers.

Description

Technical Field

[0001] The utility model relates to the technical field of boilers, and particularly relates to a continuous ignition control system for a boiler. Background Art

[0002] When the boiler furnace pressure with a high load regulation ratio switches between different output thermal powers, it will change violently, resulting in the inability of the continuous ignition flame of the boiler to maintain normal combustion, and ultimately causing abnormal shutdown of the boiler. Summary of the Utility Model

[0003] In view of this, an embodiment of the utility model provides a continuous ignition control system for a boiler to solve the technical problem that the continuous ignition flame of the boiler cannot maintain normal combustion due to violent changes in furnace pressure.

[0004] A continuous ignition control system for a boiler provided by an embodiment of the utility model includes:

[0005] A main air pipeline, the intake end of the main air pipeline is connected with a main air blower, and the outlet end of the main air pipeline communicates with the main burner of the boiler;

[0006] An ignition air pipeline, the intake end of the ignition air pipeline is connected with an ignition air source, and the outlet end of the ignition air pipeline communicates with the ignition burner of the boiler;

[0007] A main gas pipeline, the intake end of the main gas pipeline communicates with a gas supply source, and the outlet end of the main gas pipeline communicates with the main burner of the boiler;

[0008] An ignition gas pipeline, the intake end of the ignition gas pipeline communicates with a gas supply source, and the outlet end of the ignition gas pipeline communicates with the ignition burner of the boiler;

[0009] Wherein, the ignition air source is provided with a frequency converter, and the frequency converter is communicatively connected with the controller of the boiler; an equalizing valve is connected between the ignition air pipeline and the ignition gas pipeline.

[0010] Optionally, an air pressure sensor, an air control valve and an air orifice plate are sequentially arranged on the ignition air pipeline along the air flow direction; a first ignition gas stop valve, an ignition gas pressure stabilizing valve, a second ignition gas stop valve, an ignition gas orifice plate and an ignition gas ball valve are sequentially arranged on the ignition gas pipeline along the gas flow direction; one end of the equalizing valve communicates between the air pressure sensor and the air control valve, and the other end communicates between the ignition gas orifice plate and the ignition gas ball valve.

[0011] Optionally, a differential pressure sensor is connected between the intake end and the outlet end of the air orifice plate, and the differential pressure sensor is communicatively connected with the controller of the boiler.

[0012] Optionally, a main gas shut-off valve, a main gas pressure stabilizing valve, a main gas pressure sensor, a main gas orifice plate, and a main gas ball valve are sequentially arranged on the main gas pipeline along the gas flow direction.

[0013] Optionally, the main gas pipeline and the ignition gas pipeline are connected to a gas supply source through the same gas main pipe, and a total gas pressure gauge and a total gas pressure sensor are arranged on the gas main pipe.

[0014] Optionally, a temperature sensor for detecting the ambient temperature is provided on the ignition air source, and the temperature sensor is communicatively connected to the controller of the boiler.

[0015] Optionally, the controller is provided with a timer for controlling the ignition duration of the ignition burner.

[0016] Optionally, the air control valve on the ignition air pipeline is a shut-off valve, the ignition air pipelines of multiple boilers are connected to the same ignition air source, and the frequency converter of the ignition air source is communicatively connected to the controllers of multiple boilers through a group control device.

[0017] The embodiments of the present utility model have the following beneficial effects:

[0018] Connect the ignition air source to the intake end of the ignition air pipeline and communicatively connect the frequency converter of the ignition air source to the controller of the boiler, so that the controller can adjust the air supply frequency of the ignition air source according to the operating state of the boiler, thereby ensuring that the continuous ignition flame of the boiler can maintain normal combustion under different output thermal power conditions; at the same time, connect a pressure equalizing valve between the ignition air pipeline and the ignition gas pipeline, and automatically adjust the output flow of the ignition gas through the pressure change of the ignition air, thereby maintaining the stability of the continuous ignition flame under different output thermal power conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model, and those skilled in the art can obtain other drawings without creative efforts based on these drawings.

[0020] Figure 1 It is a schematic structural diagram of one embodiment of the present utility model;

[0021] Figure 2 It is a schematic structural diagram of another embodiment of the present utility model;

[0022] The numbers in the figures represent:

[0023] 1. Main air pipeline; 11. Main air blower;

[0024] 2. Main gas pipeline; 21. Main gas stop valve; 22. Main gas pressure stabilizing valve; 23. Main gas pressure sensor; 24. Main gas orifice plate; 25. Main gas ball valve;

[0025] 3. Ignition gas pipeline; 31. First ignition gas stop valve; 32. Ignition gas pressure stabilizing valve; 33. Second ignition gas stop valve; 34. Ignition gas orifice plate; 35. Ignition gas ball valve;

[0026] 4. Ignition air pipeline; 41. Ignition air source; 42. Frequency converter; 43. Air pressure sensor; 44. Air control valve; 45. Air orifice plate; 46. Differential pressure sensor; 47. Temperature sensor;

[0027] 5. Boiler; 51. Main burner; 52. Ignition burner; 53. Controller; 54. Timer;

[0028] 6. Equalizing valve;

[0029] 7. Gas main pipe; 71. Total gas pressure gauge; 72. Total gas pressure sensor;

[0030] 8. Group control device. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Please refer to Figure 1As shown in the figure, an embodiment of the present utility model provides a continuous ignition control system for a boiler, which includes a main air pipeline 1, a main gas pipeline 2, an ignition gas pipeline 3, and an ignition air pipeline 4. Among them, the intake end of the main air pipeline 1 is connected with a main air blower 11, and the outlet end of the main air pipeline 1 communicates with the main burner 51 of the boiler 5, for providing combustion air for the main burner 51. The intake end of the main gas pipeline 2 is connected to a gas supply source, and the outlet end of the main gas pipeline 2 communicates with the main burner 51 of the boiler 5, for providing combustion gas for the main burner 51. The intake end of the ignition gas pipeline 3 is connected to a gas supply source, and the outlet end of the ignition gas pipeline 3 communicates with the ignition burner 52 of the boiler 5, for providing ignition gas for the ignition burner 52. The intake end of the ignition air pipeline 4 is connected to an ignition air source 41 (such as an air blower, an air compressor, etc.), and the outlet end of the ignition air pipeline 4 communicates with the ignition burner 52 of the boiler 5, for providing ignition air for the ignition burner 52.

[0033] The ignition air source 41 is provided with a frequency converter 42, and the frequency converter 42 is communicatively connected with the controller 53 of the boiler 5. The controller 53 can adjust the air supply frequency of the ignition air source 41 according to the operating state of the boiler 5 (such as ignition, main combustion test, low combustion, medium combustion, high combustion, etc.), so that the continuous ignition flame of the boiler 5 can maintain normal combustion under different output thermal power conditions. At the same time, an equalizing valve 6 is connected between the ignition air pipeline 4 and the ignition gas pipeline 3. The equalizing valve 6 can automatically adjust the output flow of the ignition gas pipeline 3 along with the pressure change in the ignition air pipeline 4, so as to maintain the stability of the continuous ignition flame under different output thermal power conditions.

[0034] Specifically, an air pressure sensor 43, an air control valve 44, and an air orifice plate 45 are sequentially arranged on the ignition air pipeline 4 of the embodiment of the present utility model along the air flow direction. A first ignition gas cut-off valve 31, an ignition gas pressure stabilizing valve 32, a second ignition gas cut-off valve 33, an ignition gas orifice plate 34, and an ignition gas ball valve 35 are sequentially arranged on the ignition gas pipeline 3 along the gas flow direction. One end of the equalizing valve 6 communicates between the air pressure sensor 43 and the air control valve 44, and the other end communicates between the ignition gas orifice plate 34 and the ignition gas ball valve 35.

[0035] To prevent reverse flow in the ignition air pipeline 4 when the ignition air source 41 fails and shuts down, in the embodiment of the present utility model, a differential pressure sensor 46 is connected between the air inlet end and the air outlet end of the air throttle orifice plate 45, and the differential pressure sensor 46 is communicatively connected to the controller 53 of the boiler 5. When the ignition air source 41 is operating normally, the air flow in the ignition air pipeline 4 generates a positive pressure difference between the air inlet end and the air outlet end of the air throttle orifice plate 45, and sends the positive pressure difference signal to the controller 53; when the ignition air source 41 fails and shuts down, resulting in reverse flow of flue gas in the ignition air pipeline 4, a negative pressure difference will be generated between the air inlet end and the air outlet end of the air throttle orifice plate 45, and the negative pressure difference signal will be sent to the controller 53. The controller 53 thereby determines that there is an abnormality in the ignition air source 41 or the ignition air pipeline 4, and interlock protection is required.

[0036] On the main gas pipeline 2, a main gas shut-off valve 21, a main gas pressure stabilizing valve 22, a main gas pressure sensor 23, a main gas throttle orifice plate 24, and a main gas ball valve 25 are sequentially arranged along the gas flow direction. The main gas pipeline 2 and the ignition gas pipeline 3 can be connected to the gas supply source through the same gas main pipe 7. A total gas pressure gauge 71 and a total gas pressure sensor 72 are arranged on the gas main pipe 7. It can be understood that all the pressure sensors and valves on the above pipelines are communicatively connected to the controller 53 of the boiler 5, so that the controller 53 can monitor and control the gas supply status of each pipeline.

[0037] Furthermore, to reduce the influence of external temperature changes on the flame stability of the ignition burner 52, in the embodiment of the present utility model, a temperature sensor 47 for detecting the ambient temperature is provided on the ignition air source 41, and the temperature sensor 47 is communicatively connected to the controller 53 of the boiler 5, enabling the controller 53 to perform correction control on the frequency converter 42 according to the change in the ambient temperature. To prevent excessive energy consumption caused by ultra-long continuous ignition, in the embodiment of the present utility model, a timer 54 is also provided on the controller 53 to appropriately time-control the ignition duration of the ignition burner 52.

[0038] In addition, as Figure 2 shown, the ignition air pipelines 4 of multiple boilers 5 can also be connected to the same ignition air source 41 (at this time, the air control valve 44 on the ignition air pipeline 4 is a shut-off valve, and the opening degree is controlled by the controller 53 of the corresponding boiler 5). The frequency converter 42 of the ignition air source 41 is communicatively connected to the controllers 53 of multiple boilers 5 through a group control device 8. The group control device 8 can adjust the air supply frequency of the ignition air source 41 according to the operating status of multiple boilers 5, so that it can supply ignition air for multiple boilers 5 simultaneously.

[0039] In this article, specific examples are used to elaborate on the principle and implementation mode of the present utility model. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present utility model; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A continuous ignition control system for a boiler, characterized in that, Comprising: A main air pipeline, the intake end of the main air pipeline is connected to a main air blower, and the outlet end of the main air pipeline communicates with the main burner of the boiler; An ignition air pipeline, the intake end of the ignition air pipeline is connected to an ignition air source, and the outlet end of the ignition air pipeline communicates with the ignition burner of the boiler; A main gas pipeline, the intake end of the main gas pipeline communicates with a gas supply source, and the outlet end of the main gas pipeline communicates with the main burner of the boiler; An ignition gas pipeline, the intake end of the ignition gas pipeline communicates with a gas supply source, and the outlet end of the ignition gas pipeline communicates with the ignition burner of the boiler; Wherein, the ignition air source is provided with a frequency converter, and the frequency converter is communicatively connected to the controller of the boiler; a pressure equalizing valve is connected between the ignition air pipeline and the ignition gas pipeline.

2. The continuous ignition control system for a boiler according to claim 1, wherein: An air pressure sensor, an air control valve and an air orifice plate are sequentially arranged on the ignition air pipeline along the air flow direction; a first ignition gas cut-off valve, an ignition gas pressure stabilizing valve, a second ignition gas cut-off valve, an ignition gas orifice plate and an ignition gas ball valve are sequentially arranged on the ignition gas pipeline along the gas flow direction; one end of the pressure equalizing valve communicates between the air pressure sensor and the air control valve, and the other end communicates between the ignition gas orifice plate and the ignition gas ball valve.

3. The continuous ignition control system for a boiler according to claim 2, characterized in that: A differential pressure sensor is connected between the intake end and the outlet end of the air orifice plate, and the differential pressure sensor is communicatively connected to the controller of the boiler.

4. A continuous ignition control system for a boiler according to claim 1, characterized in that: A main gas cut-off valve, a main gas pressure stabilizing valve, a main gas pressure sensor, a main gas orifice plate and a main gas ball valve are sequentially arranged on the main gas pipeline along the gas flow direction.

5. A continuous ignition control system for a boiler according to claim 1, characterized in that: The main gas pipeline and the ignition gas pipeline communicate with the gas supply source through the same gas main pipe, and a total gas pressure gauge and a total gas pressure sensor are arranged on the gas main pipe.

6. The continuous ignition control system for a boiler according to claim 1, characterized in that: A temperature sensor for detecting the ambient temperature is provided on the ignition air source, and the temperature sensor is communicatively connected to the controller of the boiler.

7. A continuous ignition control system for a boiler according to claim 1, characterized in that: The controller is provided with a timer for controlling the ignition duration of the ignition burner.

8. A continuous ignition control system for a boiler according to any one of claims 1-7, characterized in that: The air control valve on the ignition air pipeline is a cut-off valve, the ignition air pipelines of multiple boilers are connected to the same ignition air source, and the frequency converter of the ignition air source is communicatively connected to the controllers of multiple boilers through a group control device.

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