Monitoring and alarming device for state of filter screen of primary air fan of boiler

Abstract

The invention relates to the technical field of fan defrosting, in particular to a boiler primary fan filter screen state monitoring and alarming device which comprises a fan air duct, a wall and a filter screen, and a first air pressure pipe and a second air pressure pipe are arranged on the two sides of the filter screen respectively. A purging pipe is arranged outside the filter screen, when the pressure difference value of the first air pressure pipe and the second air pressure pipe exceeds a set threshold value, the purging pipe sprays hot air to purge the filter screen, and real-time monitoring and remote transmission early warning of the differential pressure of the filter screen are achieved through cooperation of the air pressure pipe, the air pressure transmitter and the monitoring instrument. The filter screen blockage problem under special working conditions such as frosting in winter and cotton fibers in spring can be accurately and timely found, and the risks of equipment damage and system shutdown are effectively avoided; defrosting is carried out through circulating breathing type purging subsequently; the deicing and impurity removing efficiency and the cleaning thoroughness are improved; the overall structure layout is compact, the early warning capability of the field equipment operation state is improved, and the occurrence of equipment operation accidents is reduced.

Description

Technical Field

[0001] This invention relates to the field of fan defrosting technology, and in particular to a monitoring and alarm device for the status of boiler primary air fan filter. Background Technology

[0002] Boiler primary air users mainly include industries such as power, chemical, and metallurgy. They utilize primary air for combustion control and heat transfer to achieve efficient and stable operation.

[0003] Boiler primary air, as a key component of the boiler system, plays a crucial role in providing the air required for combustion and regulating the combustion process. Boiler primary air fans serve an important purpose in various industries, including power, chemical, and metallurgy. They utilize primary air for combustion control and heat transfer, achieving efficient and stable operation. With continuous technological advancements and expanding applications, boiler primary air fans will play an even greater role in more fields, providing strong support for the development of various industries.

[0004] The power industry is one of the main application areas for boiler primary air. In thermal power plants, the boiler is the core equipment for power generation, and primary air is a necessary condition to ensure the normal operation of the boiler. Primary air is introduced into the furnace to provide sufficient oxygen for the fuel, enabling it to burn completely and produce high-temperature, high-pressure steam, which in turn drives the steam turbine to generate electricity. At the same time, primary air can also effectively regulate the combustion process, ensuring that the temperature, pressure, and combustion efficiency within the furnace are at their optimal levels.

[0005] Chinese patent application CN117231562A discloses an automatic defrosting device for the inlet of a power plant fan, comprising a main body of the defrosting device, two symmetrically arranged heating components and a filter assembly. The filter assembly is installed on the fan inlet pipe and includes a first filter, a second filter, and a filter connecting shaft. The filter connecting shaft is rotatably connected to the main body of the defrosting device, and the first and second filters are fixedly connected to the filter connecting shaft. The heating components are arranged on both sides of the fan inlet pipe, and the main body of the defrosting device is slidably connected above the fan inlet pipe. This invention solves the technical problems of existing automatic defrosting devices, such as "affecting the power plant's power generation efficiency, hindering resource conservation, and causing a decline in fan performance" and "when frost condenses on the filter, under normal circumstances, the frost will connect the brush and push-off parts to the filter, causing the automatic defrosting device to fail to start and thus fail to complete the defrosting action." However, the above-mentioned defrosting devices occupy a large area and require a long defrosting time, failing to achieve efficient defrosting and timely alarm functions. Summary of the Invention

[0006] In view of the problems existing in the prior art, the present invention is proposed.

[0007] To solve the above technical problems, the present invention provides the following technical solution: a boiler primary air fan filter status monitoring and alarm device, comprising a fan duct and a wall, wherein the fan duct is installed through the wall and delivers external gas to the boiler primary air fan;

[0008] And, a filter screen is provided at the inlet of the fan duct, and a first air pressure pipe and a second air pressure pipe are respectively provided on both sides of the filter screen;

[0009] The filter screen is equipped with a purge pipe. When the pressure difference between the first air pressure pipe and the second air pressure pipe exceeds a set threshold, the purge pipe sprays hot air to purge the filter screen.

[0010] As a preferred embodiment of the boiler primary air fan filter status monitoring and alarm device of the present invention, it includes an air pressure transmitter, which is simultaneously connected to the first air pressure pipe and the second air pressure pipe and measures the pressure difference value. The air pressure transmitter is equipped with a monitoring instrument, which is used to compare the pressure difference value with a set threshold.

[0011] As a preferred embodiment of the boiler primary air fan filter status monitoring and alarm device of the present invention, one end of the purge pipe extends into the interior of the wall and is provided with an electrically controlled door. The monitoring instrument is electrically connected to the electrically controlled door, and the monitoring instrument controls the electrically controlled door to open after the differential pressure value exceeds a set threshold.

[0012] As a preferred embodiment of the boiler primary air fan filter status monitoring and alarm device of the present invention, wherein: one end of the purge pipe is provided with holes in an array, and the inside of the purge pipe is hollow.

[0013] As a preferred embodiment of the boiler primary air fan filter status monitoring and alarm device of the present invention, wherein: the purge pipe is provided with an isolation plate inside, the isolation plate also divides the hole into two parts, and one end of the purge pipe that penetrates into the interior of the wall is connected to an air pipe.

[0014] As a preferred embodiment of the boiler primary air fan filter status monitoring and alarm device of the present invention, a rotating fan is rotatably provided on the wall, an adjustment groove is provided on the rotating fan, and a column is detachably provided in the adjustment groove.

[0015] As a preferred embodiment of the boiler primary air fan filter status monitoring and alarm device of the present invention, wherein: a swing arm is sleeved on the outer wall of the purging pipe, and a movable groove is provided on the swing arm.

[0016] As a preferred embodiment of the boiler primary air fan filter status monitoring and alarm device of the present invention, the other end of the swing arm is provided with a toggle wheel, the outer wall of the wall is slidably provided with a slide bar, and the outer wall of the toggle wheel and the slide bar is also arrayed with transmission teeth.

[0017] As a preferred embodiment of the boiler primary air fan filter status monitoring and alarm device of the present invention, a cylinder is further provided inside the wall, and a sealing cover is provided on both sides of the cylinder.

[0018] As a preferred embodiment of the boiler primary air fan filter status monitoring and alarm device of the present invention, a reciprocating rod is slidably provided through the axis of the sealing cover, and a piston is provided at one end of the reciprocating rod that extends into the cylinder.

[0019] The beneficial effects of this invention are as follows: By cooperating with the air pressure pipe, air pressure transmitter, and monitoring instruments, real-time monitoring of filter differential pressure and remote early warning from the DCS control room are achieved. This enables accurate and timely detection of filter clogging problems under special working conditions such as winter frost and spring cotton wool, effectively avoiding the risk of equipment damage and system downtime. Defrosting is then performed through circulating breathing-type purging. Simultaneously, the reciprocating rotation of the purging pipe and the coordinated functions of suction and blowing are realized, which not only improves the efficiency and thoroughness of de-icing and impurity removal but also simplifies equipment configuration and reduces energy consumption and maintenance costs. The overall structure is compact, the transmission is stable and reliable, and it is suitable for areas and enclosed spaces where airflow is affected by filter clogging at the inlet of other fans. This significantly improves the early warning capability of on-site equipment operation status and reduces the occurrence of unexpected equipment operation events. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0021] Figure 1 This is a front view of the boiler primary air fan filter status monitoring and alarm device of the present invention.

[0022] Figure 2 This is a side view of the boiler primary air fan filter status monitoring and alarm device of the present invention.

[0023] Figure 3 This is a schematic diagram of the rotating fan region structure in this invention.

[0024] Figure 4 This is a schematic diagram of the interaction between the swing arm and the purge pipe in this invention.

[0025] Figure 5 For the present invention Figure 4 A schematic diagram of the structure of region A in the diagram.

[0026] Figure 6 This is a schematic diagram of the overall structure of the purge tube in this invention.

[0027] Explanation of reference numerals in the attached diagram: 100, fan and air duct; 101, wall;

[0028] 200. Filter screen; 201. First air pressure pipe; 202. Second air pressure pipe;

[0029] 300. Purge pipe; 3001. Electrically controlled door; 3002. Hole; 3003. Isolation plate; 3004. Air pipe;

[0030] 400, wind pressure transmitter; 4001, rotating fan; 4002, adjusting groove; 4003, column; 4004, swing arm; 4005, actuating wheel; 4006, cylinder; 4007, slide bar; 4008, transmission gear; 4009, reciprocating rod; 4011, piston; 4015, movable groove; 4017, sealing cover. Detailed Implementation

[0031] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0032] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0034] Example 1

[0035] Reference Figures 1-2 This is the first embodiment of the present invention, which provides a boiler primary air fan filter status monitoring and alarm device.

[0036] Specifically, such as Figure 1 , Figure 2 As shown, a boiler primary air fan operation status monitoring and alarm device includes: a fan duct 100 and a wall 101. The fan duct 100 is installed through the wall 101 and delivers external gas to the boiler primary air fan.

[0037] In addition, a filter screen 200 is provided at the inlet of the fan duct 100, and a first air pressure pipe 201 and a second air pressure pipe 202 are respectively provided on both sides of the filter screen 200;

[0038] The filter screen 200 is provided with a purge pipe 300. When the pressure difference between the first air pressure pipe 201 and the second air pressure pipe 202 exceeds a set threshold, the purge pipe 300 sprays hot air to purge the filter screen 200.

[0039] Among them, such as Figure 1 As shown, the first air pressure pipe 201 is located on the left side of the wall 101, that is, on the outside of the wall 101; the filter screen 200 is also located on the left side of the fan duct 100 for filtering the intake gas; the second air pressure pipe 202 is located on the right side of the filter screen 200; both air pressure pipes extend into the fan duct 100 at the same time for connected sampling.

[0040] Under normal conditions, a fan is installed on the other side of the fan duct 100 to draw in air. Therefore, the internal pressure of the fan duct 100 is lower than that of the air on the left side of the filter 200 under normal conditions. When the filter 200 is frosted in a low-temperature environment, some pores are blocked, which causes the gas entering the right side of the filter 200 to shrink, and the air pressure to decrease further. As a result, the pressure difference between the two air pressure pipes will also increase.

[0041] More preferably, it also includes a wind pressure transmitter 400, which is connected to the first wind pressure pipe 201 and the second wind pressure pipe 202 and measures the pressure difference value. The wind pressure transmitter 400 is equipped with a monitoring instrument (not shown in the figure), which is used to judge the pressure difference value and the set threshold value in real time.

[0042] The wind pressure transmitter 400 uses 0-300Pa, 4-20mA output and 24V power supply; the monitoring instrument uses AC220V power supply and has pressure display, alarm node function, remote analog quantity transmission function and alarm output contact function.

[0043] Specifically, in this embodiment, the inlet of the first air pressure pipe 201 is led to the high-pressure air zone outside the filter screen 200 at the inlet of the boiler primary air fan, and the inlet of the second air pressure pipe 202 is led to the low-pressure zone. The other ends of both air pressure pipes are connected to the air pressure transmitter 400. The air pressure transmitter 400 is installed in the instrument cabinet at the inlet of the boiler primary air fan. The differential pressure signal line is connected to the monitoring instrument. The monitoring instrument sends the early warning signal to the control room through the wire. The control room is the DCS control room.

[0044] Preferably, during implementation, an instrument box is installed at a height of 1.5 meters indoors at the filter screen 200 at the inlet of the boiler primary air fan. Stainless steel air pressure pipes are arranged in the high and low pressure areas of the filter screen 200 at the inlet of the boiler primary air fan. The analog output of the air pressure transmitter 400 is connected to the monitoring instrument, which is installed on the door of the instrument box and connected to 220V AC power. When the air pressure difference reaches a set value, the alarm node of the monitoring instrument closes to realize the early warning function. At the same time, the analog signal is transmitted remotely to realize real-time monitoring to the DCS central control room for alarm.

[0045] The above design improves the accuracy of timely problem detection under special working conditions, avoiding equipment damage caused by inadequate inspections during special working conditions such as spring cotton season and winter frost.

[0046] Preferably, one end of the purge pipe 300 extends into the interior of the wall 101 and is equipped with an electrically controlled door 3001. The monitoring instrument is electrically connected to the electrically controlled door 3001. When the differential pressure value exceeds the set threshold, the monitoring instrument controls the electrically controlled door 3001 to open.

[0047] Preferably, one end of the purge pipe 300 has an array of holes 3002, the purge pipe 300 is hollow inside, and the other end is connected to the hot air pump through a rotary joint.

[0048] The purge pipe 300 is L-shaped and moves through the wall 101. When the purge pipe 300 rotates, one side of the round pipe brushes against the outer wall of the filter screen 200. The hot air pump is used to pump hot air into the purge pipe 300 to melt the ice on the surface of the filter screen 200.

[0049] In summary, when the filter 200 at the boiler primary air fan inlet is frosted and clogged, the air pressure transmitter 400 detects the pressure of the two air pressure pipes and converts it into a differential pressure signal, which is then sent to the monitoring instrument. The monitoring instrument compares the differential pressure signal with a set threshold value. When the differential pressure reaches or exceeds the set value, the monitoring instrument sends an alarm signal to the DCS control room for early warning. At the same time, based on the operating conditions, it sends a signal to the hot air purging electric door 6 to purge the frosted area with hot air, thereby ensuring that the filter 200 remains unobstructed and the fan operates safely.

[0050] The technical solution provided in this embodiment of the invention utilizes the existing boiler primary air fan inlet system. The added devices and instruments are selected and designed according to the existing 220V AC power supply to minimize the investment cost of modification. Through differential pressure early warning, the filter screen 200 is blocked in advance, which further improves the equipment operating status and prompts maintenance personnel to check and replace the filter screen 200. This effectively prevents the risk of boiler system parameter changes and equipment shutdown caused by filter screen 200 blockage and frost in winter.

[0051] In addition, the technical solution provided by this embodiment of the present invention can be applied in areas where the filter 200 at other fan inlets is blocked and affects the air volume, as well as in enclosed spaces, which greatly improves the early warning function of the on-site equipment operating status and reduces the occurrence of unexpected events during equipment operation.

[0052] More preferably, in other embodiments, the hot air blowing pipeline system can also be replaced by a rapping system, which vibrates the surface of the filter 200 to shake off the frost and complete the cleaning of the filter 200.

[0053] This embodiment enhances the protection function of the boiler primary air fan during operation by adding a differential pressure alarm function for filter screen blockage. It remotely transmits alarms based on changes in the differential pressure parameter of filter screen 200, prompting maintenance personnel to check and clean filter screen 200. Automatic early warning and purging are achieved through parameter changes, effectively solving the problem of timely detection and improving equipment operational safety. It also resolves the issue of the lack of early warning function for frost-induced blockage of the filter screen 200 at the boiler primary air fan inlet, and the automatic early warning and purging function based on parameter changes effectively solves the problem of timely detection and improves equipment operational safety.

[0054] Example 2

[0055] refer to Figures 1-6 This is the second embodiment of the present invention. The difference is that the blow pipe 300 has two chambers inside, which realize the functions of air intake and air blowing respectively. Through the circulating breathing blow, the cleaning efficiency is further improved. It can also be used to clean up impurities such as cotton wool and leaves.

[0056] Specifically, the purge pipe 300 is equipped with an isolation plate 3003 inside, which also divides the hole 3002 into two parts. One end of the purge pipe 300 that penetrates into the wall 101 is connected to an air pipe 3004.

[0057] Two air tubes 3004 are symmetrically arranged, which are connected to the air inhalation chamber and the air blowing chamber respectively. The air inhalation chamber is used to adsorb impurities on the surface of the filter screen 200, and the air blowing chamber is used to blow out hot air to melt the frost on the surface.

[0058] In this embodiment, the air pipe 3004 connected to the air intake chamber is connected to a negative pressure pump, and a solid recovery chamber is provided at the bottom of the air pipe 3004 to intercept and filter the adsorbed impurities; the air blowing chamber is connected to a fan through the air pipe 3004 connected to it, and continuously delivers hot air to the filter screen 200.

[0059] Preferably, in this embodiment, the rhythm of inhalation and blowing can be set to an intermittent alternation. During the swinging process of the purge pipe 300, hot air is blown out during the forward movement to melt the crystallized ice and frost, and during the reverse reset process, small ice crystals and impurities are absorbed to prevent the ice and frost surface from being blocked and affecting the heat conduction in the second round, thereby improving the overall de-icing efficiency.

[0060] Even better, each chamber inside the trachea 3004 and the purge tube 300 is equipped with a one-way valve to prevent reverse airflow.

[0061] Example 3

[0062] refer to Figures 1-6 This is the third embodiment of the present invention. This embodiment is based on embodiment 2, but the difference is that the purge pipe 300 is driven to reciprocate by an external motor, and the cylinder 4006 realizes the functions of suction and blowing, which saves costs.

[0063] Specifically, a rotating fan 4001 is rotatably mounted on the wall 101, an adjustment groove 4002 is provided on the rotating fan 4001, a column 4003 is detachably mounted inside the adjustment groove 4002, and a swing arm 4004 is sleeved on the outer wall of the purge pipe 300, with a movable groove 4015 provided on the swing arm 4004.

[0064] The column 4003 is slidably disposed inside the movable groove 4015. Both the movable groove 4015 and the adjustment groove 4002 are waist-shaped grooves. The rotating fan 4001 is driven to rotate by an external motor. At the same time, the length of the movable groove 4015 is much greater than that of the rotating fan 4001, so that the column 4003 can move within the movable groove 4015 without interference throughout the entire rotation process of the rotating fan 4001.

[0065] More preferably, the other end of the swing arm 4004 is provided with a deflector wheel 4005, and the outer wall of the wall 101 is slidably provided with a slide bar 4007. The outer walls of the deflector wheel 4005 and the slide bar 4007 are also arrayed with transmission teeth 4008.

[0066] Among them, the transmission gear 4008 is an isosceles trapezoidal gear, and the slide bar 4007 and the actuating wheel 4005 achieve transmission through the interlocking transmission gear 4008.

[0067] Preferably, a cylinder 4006 is also provided inside the wall 101. A sealing cover 4017 is provided on both sides of the cylinder 4006. A reciprocating rod 4009 is slidably passed through the axis of the sealing cover 4017. A piston 4011 is provided at one end of the reciprocating rod 4009 that passes through the cylinder 4006.

[0068] In this embodiment, the piston 4011, together with the two side sealing covers 4017 and the cylinder 4006, forms two sealed cavities, and the two air pipes 3004 are connected to the two sealed cavities respectively.

[0069] In this embodiment, as Figure 5 As shown, the sealing cover 4017 of the left cavity is equipped with a heating wire, which can heat the gas inside the cavity to achieve hot air blowing. At the same time, the piston 4011 also generates heat through friction during movement to assist heating. A first one-way valve is provided between the left sealed cavity and the outside gas, and a second one-way valve is also provided between the air pipe 3004 on this side and the left sealed cavity. When blowing air, the first one-way valve is closed and the second one-way valve is opened, and the hot air is discharged through the air pipe 3004. After the discharge is completed, the piston 4011 rotates in the opposite direction, the first one-way valve opens and the second one-way valve closes, and at this time, gas is drawn from the outside for heating.

[0070] At the same time, the right sealing chamber is also set up similarly, but the one-way valve is installed in the opposite direction, so that only air can be drawn into the right sealing chamber. The drawn-in ice crystals are also compressed and heated by the piston 4011, and the ice crystals melt into water and deposit below, and are discharged from the one-way valve along with the gas.

[0071] In summary, this embodiment does not require additional independent power equipment such as negative pressure pumps and hot air pumps. The rotating fan 4001 is driven by an external motor, and the mechanical transmission structure of the swing arm 4004, slide bar 4007, cylinder 4006, and piston 4011 simultaneously realizes the reciprocating rotation of the purge pipe 300 and the functions of suction and blowing. This simplifies the equipment configuration, reduces the cost of equipment procurement, installation, and subsequent maintenance, and also reduces the energy consumption caused by the operation of independent equipment.

[0072] Meanwhile, the adjusting groove 4002 of the rotating fan 4001 and the movable groove 4015 of the swing arm 4004 adopt an oblong groove design, and the length of the movable groove 4015 is adapted to the stroke of the rotating fan 4001, ensuring that the sliding process of the column 4003 is free from interference. This allows the purge pipe 300 to rotate stably back and forth, ensuring the coverage and uniformity of the purge pipe 300's sweeping motion against the outer wall of the filter screen 200. This achieves the synergy of air intake to adsorb impurities and air blowing to defrost, preventing impurities from blocking frost and affecting heat conduction. At the same time, the left sealing cover 4017 is also added. The hot wire heating, combined with the frictional heating of the piston 4011, enhances the efficiency of hot air supply and improves the defrosting effect. The right-side sealed chamber achieves stable air intake through a one-way valve, and the piston 4011 can compress and heat the intake ice crystals to melt them into water and discharge them, preventing ice crystals and impurities from clogging the pipes or adhering to the filter screen 200, thus improving the thoroughness of cleaning. Finally, the overall structure of this device is installed against the wall 101, and the layout of each transmission component and sealed chamber is compact, adapting to the installation space of the boiler primary air fan inlet.

[0073] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise changed, and the nature or number or position of discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention.

[0074] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the invention as currently considered, or those features that are not relevant to implementing the invention) may be omitted.

[0075] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

Claims

1. A boiler primary air fan filter status monitoring and alarm device, comprising a body, characterized in that, It also includes: a fan duct (100) and a wall (101), wherein the fan duct (100) is provided through the wall (101) and delivers the gas outside the wall (101) to the boiler primary air fan; And a filter screen (200) is provided at the inlet of the fan duct (100), and a first air pressure pipe (201) and a second air pressure pipe (202) are respectively provided on both sides of the filter screen (200). The filter screen (200) is provided with a purge pipe (300). When the pressure difference between the first air pressure pipe (201) and the second air pressure pipe (202) exceeds a set threshold, the purge pipe (300) sprays hot air to purge the filter screen (200).

2. The boiler primary air fan filter status monitoring and alarm device as described in claim 1, characterized in that: It also includes a wind pressure transmitter (400), which is connected to the first wind pressure pipe (201) and the second wind pressure pipe (202) and measures the pressure difference value. The wind pressure transmitter (400) is equipped with a monitoring instrument, which is used to compare the pressure difference value with a set threshold.

3. The boiler primary air fan filter status monitoring and alarm device as described in claim 2, characterized in that: One end of the purge pipe (300) extends into the interior of the wall (101) and is equipped with an electrically controlled door (3001). The monitoring instrument is electrically connected to the electrically controlled door (3001). The monitoring instrument controls the electrically controlled door (3001) to open after the differential pressure value exceeds a set threshold.

4. The boiler primary air fan filter status monitoring and alarm device as described in claim 3, characterized in that: One end of the purge tube (300) is provided with holes (3002), and the inside of the purge tube (300) is hollow.

5. The boiler primary air fan filter status monitoring and alarm device as described in claim 4, characterized in that: The purge pipe (300) is provided with an isolation plate (3003) inside, which also divides the hole (3002) into two parts. One end of the purge pipe (300) that penetrates into the wall (101) is connected to an air pipe (3004).

6. The boiler primary air fan filter status monitoring and alarm device as described in claim 2, characterized in that: The wall (101) is rotatably provided with a rotating fan (4001), the rotating fan (4001) is provided with an adjustment groove (4002), and a column (4003) is detachably provided in the adjustment groove (4002).

7. The boiler primary air fan filter status monitoring and alarm device as described in claim 5, characterized in that: The outer wall of the purge pipe (300) is fitted with a swing arm (4004), and the swing arm (4004) is provided with a movable groove (4015).

8. The boiler primary air fan filter status monitoring and alarm device as described in claim 7, characterized in that: The other end of the swing arm (4004) is provided with a deflector wheel (4005), and the outer wall of the wall (101) is slidably provided with a slide bar (4007). The outer walls of the deflector wheel (4005) and the slide bar (4007) are also arrayed with transmission teeth (4008).

9. The boiler primary air fan filter status monitoring and alarm device as described in claim 8, characterized in that: The wall (101) is also provided with a cylinder (4006) inside, and a sealing cover (4017) is provided on both sides of the cylinder (4006).

10. The boiler primary air fan filter status monitoring and alarm device as described in claim 9, characterized in that: A reciprocating rod (4009) is slidably provided through the axis of the sealing cover (4017), and a piston (4011) is provided at one end of the reciprocating rod (4009) that extends into the cylinder (4006).

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