Boiler flame detection probe cooling air failure protection device

Abstract

The utility model relates to the technical field of thermal power generation, in particular to a boiler flame detection probe cooling air failure protection device which comprises a first flame detection fan, a hearth and a flame detection probe, and a first cooling air pipeline is fixedly communicated between an outlet of the first flame detection fan and a first inlet in the top of the hearth. The first cooling air pipeline is communicated with an outlet of the first flame detection fan, the second cooling air pipeline is communicated with an outlet of the second flame detection fan, more than one group of flame detection probes are fixedly arranged on the hearth, each group of flame detection probes are distributed at different azimuth angles of the hearth, the first cooling air pipeline is fixedly communicated with a standby air source pipeline, and a medium conveyed in the standby air source pipeline is compressed air. The device is reasonable and compact in structure and convenient to use, when boiler flame detection cooling air fails, compressed air is automatically reserved, the flame detection probe arranged in a hearth is cooled, the probe is prevented from being burnt out due to high temperature in the boiler, and the device has the advantages of being safe, labor-saving, simple, convenient and efficient.

Description

Technical Field

[0001] This utility model relates to the field of thermal power generation technology and is a boiler fire detector probe cooling air failure protection device. Background Technology

[0002] Flame monitoring probes are key equipment in boiler safety monitoring systems (FSSS). Their function is to monitor and determine whether there is a flame in the boiler furnace. When the flame in the furnace is extinguished or the burner is turned off, the flame monitoring probe will send an alarm signal, and the system will generate a chain reaction to stop the continuous supply of fuel, preventing fuel from accumulating in the furnace and causing a boiler explosion.

[0003] Cooling air, as a means of protecting flame detection probes, primarily functions to cool the probes, improve their working environment, prevent damage from excessive heat, and ensure normal boiler operation. Failure of the flame detection cooling fan or power supply will cause the cooling air to malfunction, potentially damaging the flame detection probes due to high temperatures. This would prevent monitoring of the flame combustion within the boiler furnace, and in severe cases, could lead to boiler deflagration.

[0004] Therefore, it is essential to research and invent a boiler flame detector probe cooling air failure protection device. Summary of the Invention

[0005] This utility model provides a boiler flame detector probe cooling air failure protection device, which overcomes the shortcomings of the above-mentioned prior art. It can effectively solve the problem that the flame detection probe is damaged due to unexpected cooling air failure in existing flame monitoring, which in turn causes boiler deflagration accidents.

[0006] The technical solution of this utility model is achieved through the following measures: a boiler flame detector cooling air failure protection device, including a first flame detector fan, a furnace, and a flame detector, wherein a first cooling air pipeline is fixedly connected between the outlet of the first flame detector fan and the first inlet at the top of the furnace, a flame detector is fixedly installed on the furnace, and a backup air source pipeline is fixedly connected to the first cooling air pipeline, wherein the medium transported in the backup air source pipeline is compressed air.

[0007] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:

[0008] The first cooling air duct between the first flame detection fan and the backup air source duct is fixedly installed with a first filter, a first pressure gauge and a second flame detection fan in sequence according to the medium flow direction. The outlet of the second flame detection fan is fixedly connected to the first cooling air duct between the first pressure gauge and the first filter. The second filter is fixedly installed on the second cooling air duct.

[0009] The aforementioned backup air supply pipeline is equipped with a second pressure gauge, a pressure reducing valve, and a pipeline valve in sequence according to the direction of medium flow.

[0010] The aforementioned flame detectors are configured as a group of more than one, with each group consisting of six flame detectors. The flame detectors in each group are distributed in a ring at different azimuth angles in the furnace.

[0011] A third cooling air duct is fixedly connected between the aforementioned backup air supply duct and the first cooling air duct between the furnace and the first inlet at the bottom of the furnace.

[0012] A fourth cooling air duct is fixedly connected between the first cooling air duct outlet and the second inlet at the top of the furnace, and a fifth cooling air duct is fixedly connected between the third cooling air duct and the second inlet at the bottom of the furnace.

[0013] The above-mentioned pipeline valves are solenoid valves, and the control methods are divided into manual and automatic control modes. The first pressure gauge and the second pressure gauge are both remote pressure gauges.

[0014] The above also includes the DCS controller, and the first pressure gauge, the second pressure gauge, and the pipeline valve are all electrically connected to the DCS controller.

[0015] This utility model features a reasonable and compact structure, making it easy to use. It incorporates a backup air source into the original furnace flame detector cooling air system. When the flame detector cooling air fails, the backup air source provides cooling air, reducing damage and malfunctions to the flame detector due to high temperatures, impurity accumulation, etc., thereby lowering the frequency of probe repair and replacement, and saving maintenance costs and time. Simultaneously, it ensures the normal operation of the flame detector, preventing boiler explosions and other incidents caused by flame detector malfunctions. Attached Figure Description

[0016] Appendix Figure 1 This is a schematic diagram of the process flow of this utility model.

[0017] Appendix Figure 1 The codes in the code are as follows: 1 is the first flame detection fan, 2 is the furnace, 3 is the flame detection probe, 4 is the first cooling air duct, 5 is the backup air source duct, 6 is the first filter, 7 is the first pressure gauge, 8 is the second flame detection fan, 9 is the second cooling air duct, 10 is the second filter, 11 is the second pressure gauge, 12 is the pressure reducing valve, 13 is the pipeline valve, 14 is the third cooling air duct, 15 is the fourth cooling air duct, 16 is the fifth cooling air duct, and 17 is the DCS controller. Detailed Implementation

[0018] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.

[0019] Unless otherwise specified, all equipment and devices used in this invention are existing, publicly known, and commonly used equipment and devices in the field.

[0020] In this utility model, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0021] The present invention will be further described below with reference to the embodiments and accompanying drawings:

[0022] Example 1: As shown in the attached document Figure 1 As shown, the boiler flame detector cooling air failure protection device includes a first flame detector fan 1, a furnace 2, and a flame detector 3. A first cooling air pipeline 4 is fixedly connected between the outlet of the first flame detector fan 1 and the first inlet at the top of the furnace 2. Multiple sets of flame detectors 3 are fixedly installed on the furnace 2. A backup air source pipeline 5 is fixedly connected to the first cooling air pipeline 4. The medium transported in the backup air source pipeline 5 is compressed air.

[0023] If required, when the first flame detection fan 1 fails, the compressed air in the backup air supply line 5 continuously provides cooling air to the flame detection probe 3 to ensure the normal operation of the flame detection probe 3. This ensures that the normal operation of the flame detection probe 3 can be effectively protected when the flame detection cooling air is insufficient or fails, and avoids equipment damage caused by the failure of cooling air, which would prevent the monitoring of the combustion status of the furnace 2 from occurring.

[0024] Compressed air has a certain pressure (0.2MPa to 1.0MPa) and flow rate. The compressed air source can be manually turned on periodically to blow away dust, coal dust and other impurities on the surface of the flame detector probe 3. This effectively prevents impurities from accumulating near the probe, reduces the possibility of ash accumulation and coking, keeps the probe clean, and ensures the normal operation of the flame detection system.

[0025] The above-mentioned boiler flame detector probe cooling air failure protection device can be further optimized and / or improved according to actual needs:

[0026] Example 2: Its difference from Example 1 is as follows: (See attached) Figure 1 As shown, a first filter 6 and a first pressure gauge 7 are fixedly installed on the first cooling air duct 4 between the first flame detector fan 1 and the backup air source duct 5 in sequence according to the medium flow direction.

[0027] Example 3: Its difference from Examples 1 to 2 is as follows: (See attached) Figure 1As shown, it also includes a second flame detection fan 8. A second cooling air duct 9 is fixedly connected between the outlet of the second flame detection fan 8 and the first cooling air duct 4 between the first pressure gauge 7 and the first filter 6. A second filter 10 is fixedly installed on the second cooling air duct 9.

[0028] In this utility model, the first flame detection fan 1 and the second flame detection fan 8 are used in one and standby respectively. If one flame detection fan fails, the other can be put into use immediately to prevent the flame detection probe 3 from burning out due to loss of cooling air.

[0029] As needed, the first filter 6 and the second filter 10 can be stainless steel filters. Filters are installed on the first cooling air duct 4 and the second cooling air duct 9 respectively to prevent debris from being sucked into the cooling air duct and thus clogging the flame detector probe 3.

[0030] Example 4: Its difference from Examples 1 to 3 is as follows: (See attached) Figure 1 As shown, the backup air supply pipeline 5 is fixedly equipped with a second pressure gauge 11, a pressure reducing valve 12, and a pipeline valve 13 in sequence according to the medium flow direction.

[0031] In this invention, the normal cooling air pressure of the first pressure gauge 7 is 7 kPa to 8 kPa, while the pressure of the compressed air is 500 kPa. The pressure is appropriately reduced by the pressure reducing valve 12.

[0032] Example 5: Its difference from Examples 1 to 6 is as follows: (See attached) Figure 1 As shown, the flame detector 3 is set up in groups of more than one, with each group including six flame detector 3. The flame detector 3 of each group is distributed in a ring at different azimuth angles of the furnace 2.

[0033] As needed, the flame detector 3 can be set into four groups, distributed in the four diagonal directions of the furnace 2, so as to monitor the flame situation in the furnace in all directions.

[0034] Example 6: Its difference from Examples 1 to 4 is as follows: (See attached) Figure 1 As shown, a third cooling air duct 14 is fixedly connected between the first cooling air duct 4 between the backup air source duct 5 and the furnace 2 and the first inlet at the bottom of the furnace 2.

[0035] Example 7: Its difference from Examples 1 to 5 is as follows: (See attached) Figure 1 As shown, a fourth cooling air duct 15 is fixedly connected between the first cooling air duct 4 and the second inlet at the top of the furnace 2, and a fifth cooling air duct 16 is fixedly connected between the third cooling air duct 14 and the second inlet at the bottom of the furnace 2.

[0036] As needed, the first cooling air duct 4, the third cooling air duct 14, the fourth cooling air duct 15, and the fifth cooling air duct 16 are respectively connected to the four sides of the furnace 2 to purge the flame detector 3 installed in the furnace 2.

[0037] Example 8: It differs from Examples 1 to 7 in that: as shown in the appendix Figure 1 As shown, pipeline valve 13 is a solenoid valve, and the control mode is divided into manual and automatic control modes. The first pressure gauge 7 and the second pressure gauge 11 are both remote pressure gauges.

[0038] Example 9: It differs from Examples 1 to 8 in that: as shown in the appendix Figure 1 As shown, it also includes a DCS controller 17, and the first pressure gauge 7, the second pressure gauge 11, and the pipeline valve 13 are all electrically connected to the DCS controller 17.

[0039] Depending on the needs, the pipelines and equipment of the boiler flame detector probe cooling air failure protection device may also be equipped with conventional valves, thermometers, and pressure gauges known in the art, according to production requirements. The DCS controller 17 can be a CS3000 controller manufactured by Yokogawa Corporation of Japan.

[0040] Before and after use: Before use, 24 visible light fire detectors 3 were maintained and cleaned monthly, with an average single operation time of 4 hours. Due to factors such as high temperature and dust, an average of 7 to 8 fire detectors were damaged per year. After use, the 24 visible light fire detectors 3 were maintained and cleaned quarterly, reducing the maintenance frequency from 12 times / year to 4 times / year, directly reducing the operation time by 32 hours. The failure rate of the fire detectors 3 was reduced from 7 to 8 damages per year to 2 to 3 damages per year, directly saving 48,000 yuan per year.

[0041] The above technical features constitute various embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

[0042] The usage process of this utility model embodiment is as follows: First, the flame detector 3 works normally to monitor and judge the flame condition in the furnace 2; then, the first flame detector fan 1 or the second flame detector fan 8 malfunctions, or the pressure of the first pressure gauge 7 is lower than the set pressure; finally, the pipeline valve 13 opens, and compressed air continuously provides cooling air to the flame detector 3.

Claims

1. A boiler flame detector probe cooling air failure protection device, characterized in that... It includes a first flame detection fan, a furnace, and a flame detection probe. A first cooling air duct is fixedly connected between the outlet of the first flame detection fan and the first inlet at the top of the furnace. A flame detection probe is fixedly installed on the furnace. A backup air source duct is fixedly connected to the first cooling air duct. The medium transported in the backup air source duct is compressed air.

2. The boiler flame detector probe cooling air failure protection device according to claim 1, characterized in that... A first filter and a first pressure gauge are fixedly installed on the first cooling air duct between the first flame detector fan and the backup air source duct, in sequence according to the direction of medium flow.

3. The boiler flame detector probe cooling air failure protection device according to claim 2, characterized in that... It also includes a second flame detection fan, and a second cooling air duct is fixedly connected between the outlet of the second flame detection fan and the first cooling air duct between the first pressure gauge and the first filter. A second filter is fixedly installed on the second cooling air duct.

4. The boiler flame detector probe cooling air failure protection device according to claim 1, 2, or 3, characterized in that... The backup air supply pipeline is equipped with a second pressure gauge, a pressure reducing valve, and a pipeline valve in sequence according to the direction of medium flow.

5. The boiler flame detector probe cooling air failure protection device according to claim 1, 2, or 3, characterized in that... The flame detectors are set up in groups of more than one, with each group consisting of six flame detectors. The flame detectors in each group are distributed in a ring at different azimuth angles in the furnace.

6. The boiler flame detector probe cooling air failure protection device according to claim 4, characterized in that... The flame detectors are set up in groups of more than one, with each group consisting of six flame detectors. The flame detectors in each group are distributed in a ring at different azimuth angles in the furnace.

7. The boiler flame detector probe cooling air failure protection device according to claim 1, 2, 3, or 6, characterized in that... A third cooling air duct is fixedly connected between the backup air supply duct and the first cooling air duct between the furnace and the first inlet at the bottom of the furnace.

8. The boiler flame detector probe cooling air failure protection device according to claim 7, characterized in that... A fourth cooling air duct is fixedly connected between the third cooling air duct outlet and the first cooling air duct outlet, and between the first cooling air duct outlet and the second inlet at the top of the furnace. A fifth cooling air duct is fixedly connected between the third cooling air duct and the second inlet at the bottom of the furnace.

9. The boiler flame detector probe cooling air failure protection device according to claim 6 or 8, characterized in that... The pipeline valve is a solenoid valve, and the control mode is divided into manual and automatic control modes. The first pressure gauge and the second pressure gauge are both remote pressure gauges.

10. The boiler flame detector probe cooling air failure protection device according to claim 9, characterized in that... It also includes a DCS controller, and the first pressure gauge, the second pressure gauge, and the pipeline valve are all electrically connected to the DCS controller.

Images