Backup protection system for boiler flame detection cooling air

Abstract

The invention discloses a boiler flame detection cooling air backup protection system which comprises a main cooling air system and a backup cooling air system, the main cooling air system is composed of a first cooling fan, a second cooling fan and related valve pipelines, and the main cooling air system is connected with a flame detection probe through a first communicating pipe and a main communicating pipe; the backup cooling air system takes an air compressor as a core and is communicated with the first communicating pipe through a pneumatic valve, a pressure reducing valve, a buffer tank and other components. The system is provided with a pressure sensor for monitoring cooling air pressure in a main communicating pipe in real time, a control module controls operation of a main system and a backup system according to pressure signals, a buffer tank is provided with a safety valve, each pipeline is wrapped with a polyurethane foam insulating layer, and components such as a molecular screening filter and a flow sensor are further arranged. Compressed air is adopted as a backup air source, air supply stability is guaranteed through secondary pressure reduction, quick switching can be achieved when a main system breaks down, cooling air pressure is accurately controlled, the reliability of a flame detection system is improved, and abnormal shutdown of a boiler is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of cooling air backup protection systems, in particular to a boiler flame detection cooling air backup protection system. Background Art

[0002] Boiler flame detection monitors the presence and intensity of flames in the boiler furnace in real time, preventing flameout and ensuring furnace safety. The temperature inside a boiler furnace is extremely high, and the flame detection probe is directly exposed to the high temperature. Cooling air is required to reduce the probe's temperature, prevent damage from overheating, and extend the probe's lifespan. Loss of cooling air can cause the flame detection probe to burn out, triggering flameout protection and causing the boiler to shut down, resulting in significant losses.

[0003] Traditional solutions employ a dual cooling fan design with one active and one backup. In extreme cases, such as simultaneous failure of both fans, the interruption of cooling airflow can lead to flame detection failure, triggering the boiler's furnace flameout trip (MFT), resulting in unplanned downtime. Existing technologies lack emergency airflow supply methods for dual fan failures. To address this issue, a backup protection system for boiler flame detection cooling air is proposed. Summary of the Invention

[0004] The purpose of the present invention is to solve the above problems and provide a backup protection system for boiler flame detection cooling air.

[0005] The specific solution of the present invention is: a backup protection system for boiler flame detection cooling air, comprising: a main cooling air system, the main cooling air system comprising: cooling fan 1 and cooling fan 2, the cooling fan 1 is connected to stop valve 1 and check valve 1 in sequence, the cooling fan 2 is connected to stop valve 2 and check valve 2 in sequence, the check valve 1 and check valve 2 are connected to each other through connecting pipe 1, the middle part of the connecting pipe 1 is connected to the main connecting pipe, the main connecting pipe is connected to the fire detection probe, and also includes a backup cooling air system, the backup cooling air system comprises: an air compressor, one side of the air compressor is connected to pneumatic valve 1, pressure reducing valve 1, buffer tank, pressure reducing valve 2, pneumatic valve 2, check valve 3 in sequence, and the check valve 3 is connected to connecting pipe 1.

[0006] Furthermore, a molecular screening filter is provided between the second pneumatic valve and the third check valve.

[0007] Furthermore, the main cooling air system also includes a pressure sensor, one end of which is connected to a control module. The pressure sensor is arranged at one end of the main connecting pipe close to the fire detection probe. The pressure sensor is used to monitor the cooling air pressure in the main connecting pipe in real time and transmit the pressure signal to the control module.

[0008] Further, in the backup cooling air system, a safety valve is provided on the buffer tank, and the safety valve is used to automatically relieve pressure when the pressure in the buffer tank exceeds the set threshold.

[0009] Further, the control module is electrically connected to the first cooling fan, the second cooling fan, the first pneumatic valve, and the second pneumatic valve. According to the pressure signal fed back by the pressure sensor, when the pressure of the main cooling air system is lower than the set value, the control module controls the opening of the first pneumatic valve and the second pneumatic valve to start the backup cooling air system. Further, the first connecting pipe, the main connecting pipe, and each connecting pipe in the backup cooling air system are all wrapped with heat-insulating materials, and the heat-insulating materials are polyurethane foam heat-insulating layers. Further, a flow sensor is also provided between the molecular sieve filter and the third check valve. The flow sensor is used to monitor the air outlet flow of the backup cooling air system and transmit the flow signal to the control module.

[0010] Further, the control module is also connected to an alarm device. When the pressure of the main cooling air system continuously remains lower than the set value and the pressure still does not return to normal after the backup cooling air system is started, the alarm device emits an audible and visual alarm signal.

[0011] Further, an air filter is provided between the air compressor and the first pneumatic valve. The air filter is used to filter impurities in the gas output by the air compressor to prevent impurities from entering the backup cooling air system.

[0012] The present invention has the following beneficial effects: 1. Improve reliability: Using compressed air as the backup cooling air source and through the method of secondary decompression, it ensures the stable supply of cooling air, improves the reliability of the flame detection system, and avoids abnormal shutdown of the boiler.

[0013] 2. Strong flexibility: It can quickly switch to the backup cooling air system when the main cooling air system fails, ensuring the normal operation of the flame detection probe and avoiding boiler shutdown accidents caused by the interruption of cooling air.

[0014] 3. Precise control: Through the real-time monitoring of the pressure sensor and the automatic adjustment of the control module, it realizes the precise control of the cooling air pressure and the fan state, ensuring the cooling effect of the flame detection probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural principle diagram of the present invention; In the figure: 1. First cooling fan; 2. Second cooling fan; 3. First stop valve; 4. First check valve; 5. Second stop valve; 6. Second check valve; 7. Flame detector probe; 8. Pressure sensor; 9. Control module; 10. Air compressor; 11. First pneumatic valve; 12. First pressure reducing valve; 13. Buffer tank; 14. Second pressure reducing valve; 15. Molecular sieve filter; 16. Second pneumatic valve; 17. Third check valve; 18. Flow sensor; 19. Safety valve; 20. Air filter; 21. Alarm device; 22. First connecting pipe; 23. Main connecting pipe. Specific embodiments

[0016] 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 of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0017] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0018] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0019] Please refer to Figure 1, A backup protection system for the cooling air of boiler flame detection, comprising: a main cooling air system, the main cooling air system includes: a first cooling fan 1 and a second cooling fan 2, the first cooling fan 1 is sequentially connected with a first stop valve 3 and a first check valve 4, the second cooling fan 2 is sequentially connected with a second stop valve 5 and a second check valve 6, the first check valve 4 and the second check valve 6 are interconnected through a first connecting pipe 22, a main connecting pipe 23 is connected to the middle of the first connecting pipe 22, the main connecting pipe 23 is connected to the flame detector probe 7, and it further includes a backup cooling air system, the backup cooling air system includes: an air compressor 10, one side of the air compressor 10 is sequentially connected with a first pneumatic valve 11, a first pressure reducing valve 12, a buffer tank 13, a second pressure reducing valve 14, a second pneumatic valve 16, and a third check valve 17, and the third check valve 17 is communicated with the first connecting pipe 22.

[0020] In this embodiment, a molecular sieve filter 15 is provided between the second pneumatic valve 16 and the third check valve 17.

[0021] In this embodiment, the main cooling air system further includes a pressure sensor 8, one end of the pressure sensor 8 is connected to a control module 9, the pressure sensor 8 is arranged at one end of the main connecting pipe 23 close to the flame detector probe 7, and the pressure sensor 8 is used for real-time monitoring of the cooling air pressure in the main connecting pipe 23 and transmitting the pressure signal to the control module 9.

[0022] In this embodiment, in the backup cooling air system, a safety valve 19 is provided on the buffer tank 13, and the safety valve 19 is used for automatically relieving pressure when the pressure in the buffer tank 13 exceeds the set threshold.

[0023] In this embodiment, the control module 9 is electrically connected to the first cooling fan 1, the second cooling fan 2, the first pneumatic valve 11, and the second pneumatic valve 16. According to the pressure signal fed back by the pressure sensor 8, when the pressure of the main cooling air system is lower than the set value, the control module 9 controls the opening of the first pneumatic valve 11 and the second pneumatic valve 16 to start the backup cooling air system.

[0024] In this embodiment, the first connecting pipe 22, the main connecting pipe 23, and each connecting pipe in the backup cooling air system are all wrapped with heat insulation materials, and the heat insulation materials are polyurethane foam insulation layers.

[0025] In this embodiment, a flow sensor 18 is further provided between the molecular sieve filter 15 and the third check valve 17, and the flow sensor 18 is used for monitoring the air outlet flow of the backup cooling air system and transmitting the flow signal to the control module 9.

[0026] In this embodiment, the control module 9 is further connected to an alarm device 21. When the pressure of the main cooling air system continues to be lower than the set value and the pressure still does not return to normal after the backup cooling air system is started, the alarm device 21 emits an audible and visual alarm signal.

[0027] In this embodiment, an air filter 20 is provided between the air compressor 10 and the first pneumatic valve 11. The air filter 20 is used to filter impurities in the gas output by the air compressor 10 to prevent impurities from entering the backup cooling air system.

[0028] The present invention has the following beneficial effects: 1. Improve reliability: By using compressed air as the backup cooling air source and through the method of secondary decompression, the stable supply of cooling air is ensured, the reliability of the flame detection system is improved, and abnormal boiler shutdown is avoided.

[0029] 2. Strong flexibility: It can quickly switch to the backup cooling air system when the main cooling air system fails, ensure the normal operation of the flame detection probe 7, and avoid boiler outage accidents caused by the interruption of cooling air.

[0030] 3. Precise control: Through the real-time monitoring of the pressure sensor 8 and the automatic adjustment of the control module 9, precise control of the cooling air pressure and the fan state is achieved, ensuring the cooling effect of the flame detection probe 7.

Claims

1. A backup protection system for the cooling air of boiler flame detection, comprising: Main cooling air system, the main cooling air system includes: Cooling fan 1 and Cooling fan 2. Cooling fan 1 is sequentially connected with Shut-off valve 1 and Check valve 1. Cooling fan 2 is sequentially connected with Shut-off valve 2 and Check valve 2. Check valve 1 and Check valve 2 are interconnected through Connecting pipe 1. The middle of Connecting pipe 1 is connected with Main connecting pipe. The Main connecting pipe is connected with the flame detector probe. It is characterized in that: It also includes a backup cooling air system. The backup cooling air system includes: Air compressor. One side of the air compressor is sequentially connected with Pneumatic valve 1, Pressure reducing valve 1, Buffer tank, Pressure reducing valve 2, Pneumatic valve 2, Check valve 3. Check valve 3 is connected with Connecting pipe 1.

2. The backup protection system for the cooling air of the boiler flame detection according to claim 1, characterized in that: A molecular sieve filter is provided between Pneumatic valve 2 and Check valve 3.

3. A backup protection system for the cooling air of boiler flame detection according to claim 2, characterized in that: The main cooling air system also includes a pressure sensor. One end of the pressure sensor is connected with a control module. The pressure sensor is arranged at one end of the Main connecting pipe close to the flame detector probe. The pressure sensor is used to monitor the cooling air pressure in the Main connecting pipe in real time and transmit the pressure signal to the control module.

4. A backup protection system for the cooling air of boiler flame detection according to claim 1, characterized in that: In the backup cooling air system, a safety valve is arranged on the Buffer tank. The safety valve is used to automatically relieve pressure when the pressure in the Buffer tank exceeds the set threshold.

5. The backup protection system for the cooling air of the boiler flame detection according to claim 3, characterized in that: The control module is electrically connected with Cooling fan 1, Cooling fan 2, Pneumatic valve 1, and Pneumatic valve 2. According to the pressure signal fed back by the pressure sensor, when the pressure of the main cooling air system is lower than the set value, the control module controls Pneumatic valve 1 and Pneumatic valve 2 to open and starts the backup cooling air system.

6. The backup protection system for the cooling air of the boiler flame detection according to claim 1, characterized in that: Connecting pipe 1, Main connecting pipe, and each connecting pipe in the backup cooling air system are all wrapped with heat insulation materials. The heat insulation materials are polyurethane foam insulation layers.

7. A backup protection system for the cooling air of the boiler flame detection according to claim 3, characterized in that: A flow sensor is also arranged between the molecular sieve filter and Check valve 3. The flow sensor is used to monitor the air outlet flow of the backup cooling air system and transmit the flow signal to the control module.

8. A backup protection system for the cooling air of boiler flame detection according to claim 3, characterized in that: The control module is also connected with an alarm device. When the pressure of the main cooling air system continuously remains lower than the set value and the pressure still does not return to normal after the backup cooling air system is started, the alarm device emits an audible and visual alarm signal.

9. The backup protection system for the cooling air of the boiler flame detection according to claim 1, wherein: An air filter is arranged between the air compressor and Pneumatic valve 1. The air filter is used to filter impurities in the gas output by the air compressor to prevent impurities from entering the backup cooling air system.

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