A novel anti-clogging device for the air intake door of a dry slag machine

Abstract

This utility model relates to the technical field of ash discharge systems for boiler dry ash removal machines in thermal power plants, and particularly to a novel anti-clogging device for the make-up air damper of a dry ash removal machine. The device includes a boiler dry ash removal machine body and an ash hopper located at the upper end of the boiler dry ash removal machine body. A viewing window is provided on one side of the ash hopper, and an ash hopper camera is installed outside the viewing window. Air ducts are provided at the lower ends of both sides of the boiler dry ash removal machine body, and a make-up air damper is installed in the middle of each air duct. A filter screen is installed inside the air duct near the side wall of the boiler dry ash removal machine body. A self-cleaning mechanism is provided on the outside of the filter screen, and a cooling compressed air self-cleaning pipe is provided on the outside of the self-cleaning mechanism. The cooling compressed air self-cleaning pipe performs preliminary cleaning of the filter screen by spraying cooling compressed air, and simultaneously drives the self-cleaning mechanism to perform deep cleaning of the filter screen. This solution solves the problems of frequent clogging of the make-up air damper, time-consuming and labor-intensive cleaning, and the impact on equipment operation stability.

Description

Technical Field

[0001] This utility model relates to the technical field of ash discharge system for boiler dry ash removal machine in thermal power plants, specifically a novel anti-clogging device for the air supply door of the dry ash removal machine. Background Technology

[0002] The ash discharge system of a boiler dry ash machine in a thermal power plant is a device system used to process the ash produced after boiler combustion. Through the mechanical conveying structure of the dry ash machine, high-temperature ash is continuously discharged from the ash discharge port at the bottom of the boiler in a closed channel. The ash is cooled, crushed and conveyed during the conveying process by air or other cooling media. Finally, the cooled ash is transported to the ash bin or subsequent processing device.

[0003] For example, the Chinese authorized patent CN113237070B, entitled "An Air-Cooled Dry Slag Machine Buffer Slag Well Air Supply Door," includes a dry slag machine, a side air supply duct, and a side air supply door. The dry slag machine comprises a slag well inlet section, a slag well middle section, and an ash conveying section. The side air supply door includes an upper guide plate, a lower guide plate, and a front slope of the lower wall. The side air supply duct, the side air supply door, and the air supply port on the right side wall of the slag well middle section are connected sequentially, forming the entire side air supply structure on the right side of the slag well middle section of the dry slag machine.

[0004] However, after long-term operation, the existing boiler ash removal system suffers from defects such as ash leakage due to wear of the boiler ash removal machine's sealing ring, resulting in severe ash accumulation inside the equipment. This ash accumulation not only hinders the normal operation of the conveying device inside the boiler ash removal machine, but also causes abnormal current fluctuations in the ash removal machine, leading to tripping and frequent blockage of the make-up air damper. To maintain system operation, it is necessary to clean the system multiple times a day. Moreover, cleaning the ash accumulation at the ash receiving end requires personnel to enter the ash removal machine after the equipment is shut down. The cleaning work is cumbersome, affecting the use of the equipment and the safe operation of the equipment and system. Therefore, the existing technology cannot meet the actual production needs, and there is an urgent need to design a new type of ash removal machine make-up air damper anti-blocking device that can effectively solve the problem of make-up air damper blockage. Utility Model Content

[0005] The purpose of this utility model is to provide a new type of anti-clogging device for the air supply door of a dry slag machine, so as to solve the problems mentioned in the background art of frequent clogging of the air supply door, which is time-consuming and laborious to clean and affects the stable operation of the equipment.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a novel anti-clogging device for a boiler dry slag machine's make-up air door, comprising a boiler dry slag machine body and a slag hopper disposed at the upper end of the boiler dry slag machine body. A viewing window is provided on one side of the slag hopper, and a slag hopper camera is installed outside the viewing window. The device is characterized in that: air ducts are provided at the lower ends of both sides of the boiler dry slag machine body; one end of the air duct near the boiler dry slag machine body is a cooling air outlet, and the other end of the air duct is a cooling air inlet; a make-up air door is installed in the middle of the air duct; a filter screen is installed inside the air duct on the side wall near the boiler dry slag machine body; a self-cleaning mechanism is provided on the outside of the filter screen; and a cooling compressed air self-cleaning pipe is provided on the outside of the self-cleaning mechanism. The cooling compressed air self-cleaning pipe performs preliminary cleaning of the filter screen's accumulated ash by spraying cooling compressed air, while simultaneously driving the self-cleaning mechanism to perform deep cleaning of the filter screen's accumulated ash.

[0007] Preferably, the self-cleaning mechanism includes a swirl vane assembly disposed at the outlet end of the cooling compressed air self-cleaning pipe. The swirl vane assembly includes a sleeve, a central shaft, and six swirl vanes. The sleeve is fixed to the inner wall of the air duct. The central shaft is located at the center of the sleeve, and one end of the central shaft is welded to the sleeve via a cross connecting bracket. The six swirl vanes are arranged in a ring array and welded to the outer circumferential surface of the central shaft. A connecting shaft is fixedly installed at the other end of the central shaft. A scraper is fixedly installed at the end of the connecting shaft away from the central shaft, and a metal brush is provided on the side of the scraper facing the filter screen. The metal brush is in contact with the surface of the filter screen.

[0008] Preferably, a cooling pipe is installed on the outside of the slag hopper camera, and the front end of the slag hopper camera is sealed to the cooling pipe. The upper end of the cooling pipe is provided with a high-pressure air inlet pipe for connecting to the cooling compressed air.

[0009] Preferably, the cooling pipe has an air supply pipe at its rear end, a three-way valve is installed at the lower end of the air supply pipe, an exhaust pipe is installed at the first end of the three-way valve, the second end of the three-way valve is connected to the inlet end of one of the cooling compressed air self-cleaning pipes, and the two cooling compressed air self-cleaning pipes are connected by a connecting pipe.

[0010] Preferably, an air flow sensor is installed in front of the filter in the air duct. The signal output terminal of the air flow sensor is connected to the signal input terminal of the microcontroller, and the control output terminal of the microcontroller is connected to the control terminal of the three-way valve, which is used to control the opening and closing state of the three-way valve according to the detection value of the air flow sensor.

[0011] Preferably, the swirl blade assembly, connecting shaft, and scraper are all made of high-temperature resistant aluminum alloy.

[0012] Preferably, the working pressure range of the compressed air in the cooling compressed air self-cleaning pipe is 0.3MPa to 0.5MPa.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model introduces one end of the cooling pipe used for cooling the slag hopper camera into the air supply pipe, allowing the cooled compressed air in the air supply pipe to be connected to the cooling compressed air self-cleaning pipe and the exhaust pipe respectively through a three-way valve. Under normal operating conditions, the three-way valve connects the air supply pipe and the exhaust pipe, and the continuous flow of cooled compressed air removes heat from the area around the slag hopper camera. When it is necessary to clean the ash accumulation at the air intake valve, the three-way valve is switched to connect the air supply pipe to the cooling compressed air self-cleaning pipe. The cooled compressed air enters the air duct from the cooling compressed air self-cleaning pipe and directly contacts the filter screen of the air intake valve and the boiler side wall, causing the ash accumulation at the slag receiving end to be blown into the furnace body. This effectively solves the problem of air intake valve blockage, avoids the high-risk manual entry into the slag discharge machine for cleaning, and ensures the current stability of the dry slag machine, eliminating non-stop accidents caused by tripping and the risk to system operation safety.

[0015] 2. This utility model features a self-cleaning mechanism at the rear end of the filter screen. This mechanism consists of a swirl vane assembly, a connecting shaft, and a scraper. The swirl vane assembly faces the outlet of the cooling compressed air self-cleaning pipe, while the scraper on the connecting shaft contacts the filter screen wall. The cooling compressed air discharged from the self-cleaning pipe impacts the swirl vane assembly, causing it to rotate the connecting shaft. The scraper on the connecting shaft rotates synchronously, maintaining contact with the filter screen wall and scraping and cleaning the filter screen. This effectively removes accumulated dust and impurities from the filter screen, preventing filter clogging and ensuring normal equipment operation. It requires no additional power source, is energy-saving and environmentally friendly, reduces operating costs, and effectively improves work efficiency.

[0016] 3. This utility model installs an air flow sensor at one end of the air duct near the main body of the boiler ash dryer to detect the cooling air flow entering through the make-up air door in real time. When the air flow is lower than the set value, it automatically determines that the filter screen is clogged with ash and triggers the three-way valve to switch to the state of connecting the air supply pipe and the high-pressure air self-cleaning pipe. Compared with manual inspection, this is more efficient and sensitive, avoiding insufficient cooling air due to untreated filter screen blockage, which affects the heat dissipation and operating efficiency of the equipment. At the same time, the automatic switching of the three-way valve can promptly activate the cleaning mechanism, reduce the negative impact of filter screen ash accumulation on the system, reduce the risk of equipment failure, and ensure the stable operation of the boiler ash dryer. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present utility model;

[0018] Figure 2 This is a front view of the present invention;

[0019] Figure 3 This is a perspective view of the self-cleaning mechanism of this utility model;

[0020] Figure 4 This is a schematic diagram of the internal structure of the air duct of this utility model;

[0021] Figure 5 For the present utility model Figure 4 Enlarged view of a portion of region A in the middle.

[0022] In the diagram: 1. Main body of the boiler ash dryer; 2. Cooling air outlet; 3. Air duct; 4. Make-up air damper; 5. Cooling air inlet; 6. Air flow sensor; 7. Ash hopper; 8. Viewing window; 9. Ash hopper camera; 10. Cooling pipe; 11. High-pressure air inlet pipe; 12. Air delivery pipe; 13. Three-way valve; 14. Exhaust pipe; 15. Cooling compressed air self-cleaning pipe; 16. Connecting pipe; 17. Swirl blade assembly; 18. Connecting shaft; 19. Filter screen; 20. Scraper; 21. Brush. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Please see Figure 1-5 This utility model provides an embodiment of a novel anti-clogging device for a boiler dry slag machine's air supply door, comprising a boiler dry slag machine body 1 and a slag hopper 7 disposed at the upper end of the boiler dry slag machine body 1. A viewing window 8 is provided on one side of the slag hopper 7, and a slag hopper camera 9 is installed outside the viewing window 8. The device is characterized in that: air ducts 3 are provided at the lower ends of both sides of the boiler dry slag machine body 1. One end of the air duct 3 near the boiler dry slag machine body 1 is a cooling air outlet 2, and the other end of the air duct 3 is a cooling air inlet 5. An air supply door 4 is installed in the middle of the air duct 3. A filter screen 19 is installed inside the air duct 3 near the side wall of the boiler dry slag machine body 1. A self-cleaning mechanism is provided on the outside of the filter screen 19, and a cooling compressed air self-cleaning pipe 15 is provided on the outside of the self-cleaning mechanism. The cooling compressed air self-cleaning pipe 15 performs preliminary cleaning of the ash accumulated on the filter screen 19 by spraying cooling compressed air, and at the same time drives the self-cleaning mechanism to perform deep cleaning of the ash accumulated on the filter screen 19.

[0025] The cooling compressed air ejected from the cooling compressed air self-cleaning pipe 15 directly impacts the surface of the filter screen 19, blowing off the surface dust and completing the initial cleaning; the other part of the cooling compressed air impacts the self-cleaning mechanism, providing power to drive the scraper to rotate, achieving deep cleaning. Frequent manual cleaning of the filter screen 19 is unnecessary, reducing labor intensity and costs. Through initial and deep cleaning, clogging of the filter screen 19 is effectively prevented, ensuring normal airflow in the air duct 3 and maintaining the stable operation of the boiler ash dryer body 1.

[0026] Please see Figure 3 and Figure 4 The self-cleaning mechanism includes a swirl vane assembly 17 disposed at the outlet of the cooling compressed air self-cleaning pipe 15. The swirl vane assembly 17 includes a sleeve, a central shaft, and six swirl vanes. The sleeve is fixed to the inner wall of the air duct 3. The central shaft is located at the center of the sleeve, and one end of the central shaft is welded to the sleeve through a cross connecting bracket. The six swirl vanes are arranged in a ring array and welded to the outer circumferential surface of the central shaft. A connecting shaft 18 is fixedly installed at the other end of the central shaft. A scraper 20 is fixedly installed at the end of the connecting shaft 18 away from the central shaft. A metal brush 21 is provided on the side of the scraper 20 facing the filter screen 19. The metal brush 21 is in contact with the surface of the filter screen 19. Preferably, the swirl vane assembly 17, the connecting shaft 18, and the scraper 20 are all made of high-temperature resistant aluminum alloy.

[0027] Cooled compressed air discharged from the self-cleaning pipe 15 impacts the swirl vane assembly 17, causing the swirl vane assembly 17 to drive the connecting shaft 18 to rotate. The connecting shaft 18 then drives the scraper 20 to rotate. The scraper 20 is in contact with the wall of the filter screen 19 and scrapes the surface of the filter screen 19 during rotation, effectively removing the dust accumulated on the surface of the filter screen 19. Using cooled compressed air as a power source, no additional power equipment is required, which is energy-saving and environmentally friendly. At the same time, the continuous scraping by the scraper 20 can effectively remove stubborn dust from the surface of the filter screen 19, further improving the cleaning effect of the filter screen 19, extending the service life of the filter screen 19, ensuring smooth ventilation of the air duct, and ensuring the stable operation of the main body of the boiler ash dryer.

[0028] Please see Figure 1 and Figure 2 The slag hopper camera 9 is externally equipped with a cooling pipe 10, and the front end of the slag hopper camera 9 is sealed to the cooling pipe 10. The upper end of the cooling pipe 10 is provided with a high-pressure air inlet pipe 11 for connecting to the cooling compressed air. The working pressure range of the cooling compressed air input through the high-pressure air inlet pipe 11 is 0.3MPa to 0.5MPa. Preferably, the air pressure of the compressed air in the self-cleaning pipe 15 is 0.4MPa.

[0029] Externally input cooling compressed air is delivered into the cooling pipe 10 through the high-pressure air inlet pipe 11. The cooling compressed air flows continuously within the cooling pipe 10, carrying away the heat around the slag hopper camera 9, thereby cooling the slag hopper camera 9 and effectively controlling its operating temperature. This prevents problems such as camera damage and image distortion caused by high temperatures, ensuring that the camera can continuously and stably monitor the internal conditions of the lower slag hopper 7 and provide reliable monitoring data for equipment operation.

[0030] Please see Figure 1 and Figure 2 The cooling pipe 10 has an air supply pipe 12 at its rear end. A three-way valve 13 is installed at the lower end of the air supply pipe 12. An exhaust pipe 14 is installed at the first end of the three-way valve 13. The second end of the three-way valve 13 is connected to the inlet end of one of the cooling compressed air self-cleaning pipes 15. The two cooling compressed air self-cleaning pipes 15 are connected by a connecting pipe 16.

[0031] Under normal operating conditions, the three-way valve 13 connects the air supply pipe 12 and the exhaust pipe 14. Cooling compressed air, input from the high-pressure air inlet pipe 11, passes through the cooling pipe 10 and the air supply pipe 12 and is discharged from the exhaust pipe 14, carrying away the heat around the slag hopper camera 9. When it is necessary to clean the dust accumulation on the filter screen 19, the three-way valve 13 is switched to connect the air supply pipe 12 and the cooling compressed air self-cleaning pipe 15. Cooling compressed air enters the cooling compressed air self-cleaning pipe 15 to clean the dust accumulation on the filter screen 19. This achieves two functions with one cooling compressed air system, ensuring normal cooling of the slag hopper camera 9 while making reasonable use of cooling compressed air to clean the dust accumulation on the filter screen 19.

[0032] Please see Figure 1 An air flow sensor 6 is installed in front of the filter screen 19 in the air duct 3. The signal output terminal of the air flow sensor 6 is connected to the signal input terminal of the microcontroller. The control output terminal of the microcontroller is connected to the control terminal of the three-way valve 13, which is used to control the opening and closing state of the three-way valve 13 according to the detection value of the air flow sensor 6.

[0033] Preferably, in this embodiment, the gas flow sensor 6 is a JL-LDR thermal gas flow meter, which measures flow using the principle of heat conduction. The sensor and pipeline body are made of 316L stainless steel, which can withstand high temperatures and stably measure gas flow in high-temperature environments. The gas flow sensor 6 monitors the cooling airflow through the filter 19 in the air duct 3 in real time and transmits the data to the microcontroller. When the gas flow is lower than the set value, the microcontroller determines that the filter 19 is clogged with dust and immediately issues a command to control the three-way valve 13 to switch, allowing high-pressure air to enter the cooling compressed air self-cleaning pipe 15 to clean the dust accumulation on the filter 19. By setting the gas flow sensor 6, the problem of dust accumulation and blockage on the filter 19 can be detected in a timely and accurate manner, which is more efficient and accurate than manual inspection; it realizes the automation of filter dust cleaning, reduces manual intervention, lowers maintenance costs, and ensures the normal flow of cooling air in the air duct by cleaning the dust in a timely manner.

[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A novel anti-clogging device for the air intake door of a boiler dry slag machine, comprising a boiler dry slag machine body (1) and a slag hopper (7) disposed at the upper end of the boiler dry slag machine body (1), wherein a viewing window (8) is provided on one side of the slag hopper (7), and a slag hopper camera (9) is installed outside the viewing window (8), characterized in that: The lower ends of both sides of the main body (1) of the boiler slag dryer are provided with air ducts (3). One end of the air duct (3) near the main body (1) of the boiler slag dryer is a cooling air outlet (2), and the other end of the air duct (3) is a cooling air inlet (5). A make-up air door (4) is installed in the middle of the air duct (3). A filter screen (19) is installed inside the air duct (3) near the side wall of the main body (1). A self-cleaning mechanism is provided on the outside of the filter screen (19). A cooling compressed air self-cleaning pipe (15) is provided on the outside of the self-cleaning mechanism. The cooling compressed air self-cleaning pipe (15) sprays cooling compressed air to perform preliminary cleaning of the dust accumulation on the filter screen (19) and drives the self-cleaning mechanism to perform deep cleaning of the dust accumulation on the filter screen (19).

2. The novel anti-blocking device for the air supply door of the dry slag machine according to claim 1, characterized in that: The self-cleaning mechanism includes a swirl vane assembly (17) disposed at the outlet of the cooling compressed air self-cleaning pipe (15). The swirl vane assembly (17) includes a sleeve, a central shaft and six swirl vanes. The sleeve is fixed to the inner wall of the air duct (3). The central shaft is located at the center of the sleeve, and one end of the central shaft is welded to the sleeve through a cross connecting frame. The six swirl vanes are arranged in a ring array and welded to the outer circumferential surface of the central shaft. A connecting shaft (18) is fixedly installed at the other end of the central shaft. A scraper (20) is fixedly installed at the end of the connecting shaft (18) away from the central shaft. A metal brush (21) is provided on the side of the scraper (20) facing the filter screen (19). The metal brush (21) is in contact with the surface of the filter screen (19).

3. The new type of dry slag machine air door anti-blocking device according to claim 1, characterized in that: The slag hopper camera (9) is equipped with a cooling pipe (10) on its exterior, and the front end of the slag hopper camera (9) is sealed to the cooling pipe (10). The upper end of the cooling pipe (10) is provided with a high-pressure air inlet pipe (11) for connecting to the cooling compressed air.

4. The new type of dry slag machine air door anti-blocking device according to claim 3, characterized in that: The cooling pipe (10) is provided with a gas supply pipe (12) at its rear end. A three-way valve (13) is installed at the lower end of the gas supply pipe (12). An exhaust pipe (14) is installed at the first end interface of the three-way valve (13). The second end interface of the three-way valve (13) is connected to the inlet end of one of the cooling compressed air self-cleaning pipes (15). The two cooling compressed air self-cleaning pipes (15) are connected by a connecting pipe (16).

5. The new type of dry slag machine air door anti-blocking device according to claim 4, characterized in that: The air duct (3) is equipped with an air flow sensor (6) in front of the filter (19). The signal output terminal of the air flow sensor (6) is connected to the signal input terminal of the microcontroller. The control output terminal of the microcontroller is connected to the control terminal of the three-way valve (13) to control the opening and closing state of the three-way valve (13) according to the detection value of the air flow sensor (6).

6. The new type of dry slag machine air door anti-blocking device according to claim 2, characterized in that: The swirl blade assembly (17), connecting shaft (18) and scraper (20) are all made of high-temperature resistant aluminum alloy.

7. The novel anti-clogging device for the air supply door of the dry slag machine according to claim 1, characterized in that: The working pressure range of the cooling compressed air in the cooling compressed air self-cleaning pipe (15) is 0.3MPa to 0.5MPa.

Images