A filtration device for ash conveying pipelines at the top of ash silos

Abstract

This invention discloses a filtration device for the ash conveying pipeline at the top of an ash silo, comprising a filter with a first filter screen that divides the filter into a front chamber and a rear chamber. The front chamber is connected to a pneumatic ash conveying system, and the rear chamber is connected to the ash silo pipeline. An airlock is connected to the bottom of the filter, and an airlock mechanism is installed inside the airlock. An iron storage box is installed at the bottom of the airlock, and an induction unloading mechanism is installed inside the iron storage box. By installing a filtration device in the ash conveying system of a thermal power plant, this invention can filter the fly ash entering the ash silo pipeline multiple times, preventing impurities from entering the ash silo along with the fly ash, and avoiding accidents such as damage to the gasification plate in the ash silo, blockage of the ash discharge port, and equipment jamming.

Description

Technical Field

[0001] This invention relates to the field of ash conveying systems in thermal power plants, specifically to a filtration device for ash conveying pipelines at the top of ash silos. Background Technology

[0002] The debris in the ash conveying system of thermal power plants mainly comes from wear-resistant tiles that have fallen off the boiler heating surfaces, supports that have fallen off from the flue and dust collectors, and metal debris such as construction waste left after the maintenance of the furnace and flue system. This debris enters the ash silo along with the fly ash through the ash conveying pipeline, seriously endangering the safe operation of the ash silo system equipment. The hazards of debris entering the ash silo are mainly as follows: 1. When the ash level is low, some of the gasification plates at the bottom of the ash silo will be exposed. At this time, larger debris falling from the top of the ash silo has a high probability of damaging the gasification plates; 2. If a large amount of debris enters the ash silo for a long time and accumulates at the ash discharge port, it can easily cause poor ash discharge, and in severe cases, blockage of the ash discharge port; 3. Smaller debris enters the ash silo and enters the ash discharge system and fly ash sorting system through the ash discharge port, causing frequent malfunctions such as rotary feeder jamming and tripping, and ash discharge valves failing to close in time due to jamming, seriously affecting the reliability of equipment operation. Existing technologies do not consider filtering the ash conveying pipeline at the top of the ash silo. A large amount of debris enters the ash silo along with the fly ash, which can easily cause accidents such as damage to the gasification plate inside the ash silo, blockage of the ash discharge port, and equipment jamming.

[0003] In the prior art, Chinese patent application number CN202010383655.7 discloses "a pneumatic ash conveying system and its usage method", which causes the ash material entering the system to pass through a filter device to isolate the coarse ash material at the bottom of the separation device and enter the coarse ash silo. At the same time, the system uses airflow to carry the fine ash material into the conveying device and convey it to the fine ash silo for separation. However, the above solution cannot filter out large-volume and large-mass debris, and when debris falls, the safety of the operator cannot be guaranteed. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a filtration device for the ash conveying pipeline at the top of the ash silo. By installing a filtration device in the ash conveying system of a thermal power plant, the fly ash entering the ash silo pipeline can be filtered multiple times, preventing impurities from entering the ash silo along with the fly ash, and avoiding accidents such as damage to the gasification plate inside the ash silo, blockage of the ash discharge port, and equipment jamming.

[0005] The technical solution of the present invention is as follows:

[0006] A filtration device for an ash conveying pipeline at the top of an ash silo includes a filter with a first filter screen that divides the filter into a front chamber and a rear chamber. The front chamber is connected to a pneumatic ash conveying system, and the rear chamber is connected to the ash silo pipeline. An airlock is connected to the bottom of the filter, and an airlock mechanism is installed inside the airlock. An iron storage box is installed at the bottom of the airlock, and an induction unloading mechanism is installed inside the iron storage box.

[0007] Furthermore, the airlock also includes an airlock housing, and the airlock mechanism includes an airlock lever. The fulcrum of the airlock lever is hinged to the airlock housing. An airlock tongue plate is provided on one side of the airlock lever that passes through the airlock housing, and a counterweight is fixedly provided on the other side of the airlock lever. A locking device is fitted onto the airlock housing, and the locking device is used to fix the airlock lever.

[0008] Furthermore, the lower end of the first filter extends above the airlock tongue plate, and the airlock box is located on the upper part of the airlock tongue plate and has an open structure on the side near the rear box. The fly ash accumulated on the airlock tongue plate enters the rear box through the first filter.

[0009] Furthermore, the inductive unloading mechanism includes an unloading gate and a locking induction switch. The unloading gate is located at the bottom of the iron storage box and is hinged to the iron storage box on one side. A locking induction module is provided on the other side of the unloading gate. The locking induction switch is fixedly located at the bottom of the iron storage box. The locking induction module and the locking induction switch are used in cooperation with each other.

[0010] Furthermore, the lower end of the iron storage box is connected to an ash discharge pipe, which is connected to the ash silo pipeline, and a second filter screen is provided at the input end of the ash discharge pipe.

[0011] Furthermore, the inductive unloading mechanism also includes a level switch, the probe of which is fixedly mounted on the side wall of the iron storage box. The side wall of the iron storage box is also provided with a protective cover, which is located above the probe of the level switch. An alarm electrically connected to the level switch is provided on the outside of the iron storage box.

[0012] Furthermore, the filter and the iron storage box are respectively provided with a first observation window and a second observation window, and the first observation window and the second observation window are respectively provided with a first scraper and a second scraper for cleaning.

[0013] Furthermore, the locking device is a pneumatic telescopic rod, and the locking device is electrically connected to the locking induction switch.

[0014] Furthermore, the material level switch is a linear rotary blocking switch or a shovel-type rotary blocking switch.

[0015] Furthermore, the locking induction switch is a feedback reflective laser switch.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. This invention prevents impurities from entering the ash silo along with fly ash by installing a filter device in the ash conveying system of a thermal power plant, thus avoiding accidents such as damage to the gasification plate in the ash silo, blockage of the ash discharge port in the ash silo, and equipment jamming.

[0018] 2. The present invention is equipped with an airlock mechanism, and the airlock box is a structure with three sides closed and one side open, which can effectively reduce the accumulation of ash on the upper part of the airlock tongue plate, greatly reduce the probability of fly ash entering the iron storage box, and prevent fly ash from accumulating on the airlock tongue plate and causing the airlock device to malfunction.

[0019] 3. The bottom of the iron storage box of the present invention is designed with an ash discharge port. By utilizing the negative pressure suction force of the ash silo, the secondary separation of debris and fly ash can be achieved, which can not only avoid the accumulation of fly ash in the iron storage box, but also prevent fly ash leakage and environmental pollution during the unloading process.

[0020] 4. This invention is designed with an iron unloading lock. When the iron unloading door is opened, the lock prevents debris from falling from the lock tongue plate, which can effectively ensure the safety of workers when cleaning the iron storage box. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a front view of the filter in this invention;

[0023] Figure 3 This is a front view of the airlock device in this invention;

[0024] Figure 4 This is a front view of the iron storage box in this invention.

[0025] The attached diagram lists the components represented by each number as follows:

[0026] 1. Filter; 11. First filter screen; 12. Front housing; 13. Rear housing; 14. First observation window; 15. First scraper; 16. First handle; 17. Filter screen slot; 18. Filter screen replacement and maintenance door; 2. Airlock; 21. Airlock mechanism; 211. Airlock lever; 212. Airlock tongue plate; 213. Counterweight; 22. Airlock housing; 23. Locking device; 3. Iron storage box; 31. Inductive unloading mechanism; 311. Unloading door; 312. Locking induction switch; 313. Locking induction module; 314. Material level switch; 315. Alarm; 32. Ash discharge pipe; 33. Second filter screen; 34. Protective cover; 35. Second observation window; 36. Second scraper; 37. Second handle; 4. Pneumatic ash conveying system; 5. Ash silo pipeline; 6. Iron disposal trolley. Detailed Implementation

[0027] To make the content of this invention easier to understand, the technical solutions of this invention will be further described below with reference to specific embodiments and accompanying drawings, but this invention is not limited thereto.

[0028] Please see Figure 1 The invention provides a technical solution: a filtration device for an ash conveying pipeline at the top of an ash silo, comprising a filter 1, which is directly installed on the ash conveying pipeline of the ash silo. The filter 1 has a filter screen slot 17, through which a first filter screen 11 passes. The first filter screen 11 penetrates the filter 1, dividing it into a front chamber 12 and a rear chamber 13. The first filter screen 11 can be inspected and replaced through a filter screen replacement inspection door 18. The front chamber 12 is connected to a pneumatic ash conveying system 4, and the rear chamber 13 is connected to the ash silo pipeline 5. (Fly ash...) The fly ash is conveyed to the front box 12 by the pneumatic ash conveying system 4. After being filtered by the first filter screen 11, the fly ash is discharged into the rear box 13 and finally enters the ash silo pipe 5. The bottom of the filter 1 is connected to the airlock 2. The debris filtered by the first filter screen 11 is temporarily stored in the airlock 2. The airlock 2 is equipped with an airlock mechanism 21. The bottom of the airlock 2 is equipped with an iron storage box 3. The airlock mechanism 21 is used to prevent fly ash from entering the iron storage box 3. The iron storage box 3 is equipped with an induction unloading mechanism 31. The iron storage box 3 is equipped with a scrap iron cart 6 for stacking debris.

[0029] Specifically, the airlock 2 also includes an airlock housing 22, and the airlock mechanism 21 includes an airlock lever 211. The fulcrum of the airlock lever 211 is hinged to the airlock housing 22. An airlock tongue plate 212 is provided on one side of the airlock lever 211 that passes through the airlock housing 22, and a counterweight 213 is fixedly provided on the other side of the airlock lever 211. A locking device 23 is fitted on the airlock housing 22 to fix the airlock lever 211. The lower end of the first filter screen 11 extends above the airlock tongue plate 212. Debris slides down the first filter screen 11 onto the airlock tongue plate 212. When the weight of the debris on the airlock tongue plate 212 is greater than that of the counterweight 213, the locking device 23 is retracted, and the airlock tongue plate 212 automatically rotates and opens along the fulcrum of the airlock lever 211 to unload the material. The debris enters the iron storage box 3, realizing the separation of debris from fly ash in one step.

[0030] Specifically, the airlock box 22 has an open structure on the side above the airlock tongue plate 212 and close to the rear box 13. The fly ash accumulated on the airlock tongue plate 212 enters the rear box 13 through the first filter screen 11, ensuring that the airlock tongue plate 212 does not accumulate ash, and at the same time preventing fly ash from accumulating on the airlock tongue plate 212 and causing the airlock device 2 to malfunction.

[0031] Specifically, the induction unloading mechanism 31 includes an unloading gate 311 and a locking induction switch 312. The unloading gate 311 is located at the bottom of the iron storage box 3 and is hinged to the iron storage box 3 on one side. Debris falls onto the unloading gate 311. A locking induction module 313 is provided on the other side of the unloading gate 311. The locking induction switch 312 is fixedly located at the bottom of the iron storage box 3. The locking induction module 313 and the locking induction switch 312 work together. The locking device 23 is a pneumatic telescopic rod. The locking device 23 is electrically connected to the locking induction switch 312. When the unloading gate 311 is opened, the locking induction module 313 disengages from the locking induction switch 312, triggering the locking device 23 to extend its telescopic rod, preventing the air lock tongue plate 212 from moving when the unloading gate 311 is opened, and preventing debris from falling from the air lock tongue plate 212 and hitting the personnel below.

[0032] Specifically, the lower end of the iron storage box 3 is connected to an ash discharge pipe 32, which is connected to the ash silo pipe 5. The input end of the ash discharge pipe 32 is equipped with a second filter screen 33. By utilizing the negative pressure suction force of the ash silo pipe 5, the debris in the iron storage box 3 can be separated for a second time through the second filter screen 33, which prevents the accumulation of fly ash in the iron storage box 3 and also prevents fly ash leakage and environmental pollution during the unloading process.

[0033] Specifically, the inductive unloading mechanism 31 also includes a level switch 314. The probe of the level switch 314 is fixedly installed on the side wall of the iron storage box 3. A protective cover 34 is also installed on the side wall of the iron storage box 3. The protective cover 34 is installed above the probe of the level switch 314. An alarm 315 electrically connected to the level switch 314 is installed on the outside of the iron storage box 3. When the debris in the iron storage box 3 is full and touches the probe of the level switch 314, the alarm 315 will sound an alarm.

[0034] Specifically, the filter 1 and the iron storage box 3 are respectively provided with a first observation window 14 and a second observation window 35 on their side walls. The wear and material accumulation of the first filter screen 11 can be observed in time through the first observation window 14, and the debris in the iron storage box 3 can be observed in time through the second observation window 35. The first observation window 14 and the second observation window 35 are respectively provided with a first scraper 15 and a second scraper 36 for cleaning. The first scraper 15 is fixedly connected to a first handle 16. The first handle 16 drives the first scraper 15 to clean the first observation window 14. The second scraper 36 is fixedly connected to a second handle 37. The second handle 37 drives the second scraper 36 to clean the second observation window 35.

[0035] Preferably, the first filter screen 11 and the second filter screen 33 are wear-resistant steel plates with a Brinell hardness of 500HB, and the opening ratio of the first filter screen 11 and the second filter screen 33 is 50%-60%.

[0036] Specifically, the material level switch 314 is a linear rotary blocking switch or a shovel-type rotary blocking switch.

[0037] Specifically, the interlocking induction switch 312 is a feedback reflective laser switch, which can prevent operators from accidentally triggering the switch during iron unloading operations.

[0038] Working principle of the invention:

[0039] Fly ash is conveyed into the front chamber 12 of filter 1 via pneumatic conveying system 4. After being filtered by the first filter screen 11, the fly ash is discharged into the rear chamber 13 of filter 1 and finally enters the ash silo pipe 5. The impurities filtered by the first filter screen 11 slide down along the first filter screen 11 into the airlock chamber 22 and accumulate briefly on the airlock tongue plate 212. When the weight of the impurities on the airlock tongue plate 212 is greater than the counterweight 213, the airlock tongue plate 212 automatically opens to discharge the material. The impurities enter the lower chamber of the iron storage box 3 through the upper chamber. The ash discharge pipe 32 of the iron storage box 3 is connected to the ash silo pipe 5. Using the negative pressure suction force of the ash silo, the fly ash entrained in the impurities passes through the second filter screen 33 of the iron storage box 3 and enters the ash silo. After being filtered by the second filter screen 33 of the iron storage box 3, the debris is left in the unloading door 311 of the iron storage box 3, realizing the secondary separation of debris and fly ash. When the probe of the material level switch 314 detects that the iron storage box 3 is full of debris, the material level switch 314 of the iron storage box 3 triggers the alarm 315 to sound an alarm. After a period of time or when it is full, the debris can be unloaded into the scrap trolley 6 by opening the unloading door 311 below the iron storage box 3. When the unloading door 311 of the iron storage box 3 is opened, the locking sensing module 313 is out of the sensing distance of the locking sensing switch 312, triggering the locking device 23 to act. The telescopic rod of the locking device 23 extends to lock and prevent the locking air tongue plate 212 from acting. After the unloading work is completed, the locking device 23 automatically resets.

[0040] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A filtration device for an ash conveying pipeline at the top of an ash silo, characterized in that: The system includes a filter (1) through which a first filter screen (11) passes, dividing the filter (1) into a front chamber (12) and a rear chamber (13). The front chamber (12) is connected to a pneumatic ash conveying system (4), and the rear chamber (13) is connected to an ash silo pipe (5). An airlock (2) is connected to the bottom of the filter (1), and an airlock mechanism (21) is installed inside the airlock (2). An iron storage box (3) is installed at the bottom of the airlock (2), and an induction unloading mechanism (31) is installed inside the iron storage box (3). The airlock (2) further includes an airlock housing (22), and the airlock mechanism (21) includes an airlock lever (211). The fulcrum of the airlock lever (211) is hinged to the airlock housing (22). An airlock tongue plate (212) is provided on one side of the airlock lever (211) that passes through the airlock housing (22), and a counterweight (213) is fixedly provided on the other side of the airlock lever (211). A locking device (23) is fitted onto the airlock housing (22) to fix the airlock lever (211). The first filter screen (1) 1) The lower end extends above the airlock tongue plate (212). The airlock box (22) is located on the upper end of the airlock tongue plate (212) and has an open structure on the side near the rear box (13). The fly ash accumulated on the airlock tongue plate (212) enters the rear box (13) through the first filter screen (11). The induction unloading mechanism (31) includes an unloading door (311) and a locking induction switch (312). The unloading door (311) is located at the bottom of the iron storage box (3) and is hinged to the iron storage box (3) on one side. On the other side, a locking sensor module (313) is provided, and the locking sensor switch (312) is fixedly installed at the bottom of the iron storage box (3). The locking sensor module (313) and the locking sensor switch (312) are used in conjunction with each other. The lower end of the iron storage box (3) is connected to a ash discharge pipe (32), which is connected to the ash silo pipe (5). A second filter screen (33) is provided at the input end of the ash discharge pipe (32). The locking device (23) is a pneumatic telescopic rod, and the locking device (23) is electrically connected to the locking sensor switch (312).

2. The ash conveying pipeline filtration device at the top of the ash silo according to claim 1, characterized in that: The inductive unloading mechanism (31) also includes a level switch (314). The probe of the level switch (314) is fixedly installed on the side wall of the iron storage box (3). The side wall of the iron storage box (3) is also provided with a protective cover (34). The protective cover (34) is located above the probe of the level switch (314). An alarm (315) electrically connected to the level switch (314) is provided on the outside of the iron storage box (3).

3. The ash conveying pipeline filtration device at the top of the ash silo according to claim 1, characterized in that: The filter (1) and the iron storage box (3) are respectively provided with a first observation window (14) and a second observation window (35) on their side walls. The first observation window (14) and the second observation window (35) are respectively provided with a first scraper (15) and a second scraper (36) for cleaning.

4. The ash conveying pipeline filtration device at the top of the ash silo according to claim 2, characterized in that, The material level switch (314) is a linear rotary blocking switch or a shovel-type rotary blocking switch.

5. A filtration device for an ash conveying pipeline at the top of an ash silo according to claim 1, characterized in that, The locking induction switch (312) is a feedback reflection laser switch.

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