A timed cleaning device for radar level gauge antennas in a dry distillation buffer silo

Abstract

This utility model discloses a timed cleaning device for a radar level gauge antenna in a dry distillation buffer silo. A desalination mechanism is installed on the radar level gauge's measuring connecting pipe. The outlet of the desalination mechanism's demineralized water flushing pipe passes through the radar level gauge's measuring connecting pipe. The demineralized water flushing pipe is equipped with a first shut-off valve, a first solenoid valve, and a second shut-off valve. The radar level gauge and the first solenoid valve are connected to a PLC. The desalination mechanism ensures that demineralized water can flush away coal dust and sludge from the radar level gauge antenna through the demineralized water flushing pipe. A nitrogen pipe and a first nitrogen purging pipe dry any residual water on the antenna. Third and fourth nitrogen purging pipes continuously blow air, maintaining positive pressure inside the first nitrogen purging pipe and the demineralized water flushing pipe to prevent coal dust backflow and blockage, and to prevent the timed flushing device from malfunctioning. Through timed cyclical purging, it is ensured that thick coal dust and sludge cannot accumulate on the radar level gauge antenna, allowing the radar level gauge to accurately measure the coal in the dry distillation buffer silo.

Description

Technical Field

[0001] This utility model belongs to the field of radar level gauge level measurement technology, specifically relating to a timed cleaning device for the antenna of a radar level gauge in a dry distillation buffer silo. Background Technology

[0002] A radar level gauge mainly consists of transmitting and receiving devices, a signal processor, an operation panel, a display, an antenna, and a fault alarm device. The radar level gauge uses the characteristics of radar waves to detect material level; its basic working principle is transmission-reflection-reception. The radar level gauge's antenna transmits radar waves in the form of a beam. After being reflected by the material surface inside the silo, the radar waves are received by the radar receiving unit. By measuring the time interval between the radar wave transmission and reception (i.e., the time delay), the material level height inside the silo can be measured.

[0003] However, when measuring the coal level in the buffer silo after the drying furnace of the pyrolysis unit, the raw coal containing moisture enters the drying furnace for drying. The temperature of the coal produced by the drying furnace is around 108℃. It enters the buffer silo from top to bottom via the screw motor and chain bucket conveyor, resulting in a large amount of coal dust and a small amount of water vapor in the buffer silo. The water vapor and coal dust accumulate on the top of the buffer silo and adhere to the antenna of the radar level gauge installed on the top of the buffer silo. Over time, the water vapor and coal dust accumulate on the radar level gauge antenna, forming a thick layer of coal dust sludge. This prevents the electromagnetic microwaves of the radar level gauge from being transmitted to the actual material level in the buffer silo, causing the radar level gauge to distort the measurement.

[0004] The existing solution to the problem of radar level gauge measurement distortion caused by thick coal dust sludge accumulating on the antenna of the radar level gauge in the dry distillation buffer silo is that the instrument maintenance worker directly removes the fixing flange of the radar level gauge, takes the radar level gauge out, cleans the coal dust sludge adhering to the radar level gauge antenna with a cloth, wipes the radar level gauge antenna clean, and then reinstalls the radar level gauge. This is not only time-consuming and labor-intensive, but also increases the risk of the instrument maintenance worker inhaling a large amount of coal dust and nitrogen when removing the radar level gauge. In addition, it causes the output and qualification rate of the dry distillation process to fail to meet the standards, increases production costs, and causes significant losses. Utility Model Content

[0005] The purpose of this invention is to provide a timed cleaning device for the antenna of a radar level gauge in a dry distillation buffer silo, so as to solve the above-mentioned problems.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A timed cleaning device for a radar level gauge antenna in a dry distillation buffer silo includes a drying furnace, a drying furnace feed pipe, a drying furnace screw motor, a chain bucket conveyor, a chain bucket conveyor screw motor, a chain bucket conveyor feed pipe, and a buffer silo arranged in sequence. A radar level gauge measuring connecting pipe passes through the top of the buffer silo, and a radar level gauge is installed at the top of the radar level gauge measuring connecting pipe. A desalination mechanism is installed on the radar level gauge measuring connecting pipe. The desalination mechanism includes a desalination pipe and a desalination water flushing pipe connected to the desalination water pipe. The outlet end of the desalination water flushing pipe passes through the side wall of the radar level gauge measuring connecting pipe. A first shut-off valve, a first solenoid valve, and a second shut-off valve are arranged in sequence along the water flow direction on the desalination water flushing pipe. The radar level gauge and the first solenoid valve are electrically connected to a PLC.

[0008] To further realize this utility model, the radar level gauge measuring connecting pipe is also equipped with a demineralized water drying mechanism. The demineralized water drying mechanism includes a nitrogen pipe and a first nitrogen purging pipe connected to the nitrogen pipe. The first nitrogen purging pipe passes through the side wall of the radar level gauge measuring connecting pipe. A third shut-off valve, a first filter pressure reducing valve, a second solenoid valve, and a fourth shut-off valve are sequentially arranged on the first nitrogen purging pipe along the gas flow direction. The second solenoid valve is electrically connected to the PLC. The third and fourth shut-off valves facilitate online replacement of the first filter pressure reducing valve and the second solenoid valve.

[0009] To further realize this utility model, the nitrogen pipe is also provided with a second nitrogen purging pipe, and a third nitrogen purging pipe and a fourth nitrogen purging pipe are provided on the second nitrogen purging pipe. The outlet end of the third nitrogen purging pipe is connected to the first nitrogen purging pipe, and the outlet end of the fourth nitrogen purging pipe is connected to the demineralized water flushing pipe.

[0010] To further realize this utility model, a fifth shut-off valve, a second filter pressure reducing valve, a third solenoid valve, and a sixth shut-off valve are sequentially arranged along the gas flow direction on the second nitrogen purge pipe. A seventh shut-off valve is arranged at the outlet end of the second nitrogen purge pipe. The third solenoid valve is electrically connected to the PLC. The fifth and sixth shut-off valves facilitate online replacement of the second filter pressure reducing valve and the third solenoid valve.

[0011] To further realize this utility model, a first check valve is provided on the third nitrogen purging pipe, and a second check valve is provided on the fourth nitrogen purging pipe.

[0012] To further realize this utility model, the outlet ends of the demineralized water flushing pipe and the nitrogen purging pipe I are both oriented towards the antenna of the radar level gauge.

[0013] The advantages of this utility model compared to the prior art are as follows:

[0014] This invention designs a desalination mechanism to ensure that desalinated water can periodically flush the coal dust and sludge on the radar level gauge antenna through the desalinated water flushing pipe. A nitrogen pipe and a first nitrogen purging pipe are designed to dry any residual desalinated water on the radar level gauge antenna. A third and fourth nitrogen purging pipe, connected to a second nitrogen purging pipe, are also designed. When the first nitrogen purging pipe and the desalinated water flushing pipe are not purging or flushing, the third and fourth nitrogen purging pipes continuously blow air, maintaining positive pressure inside the first nitrogen purging pipe and the desalinated water flushing pipe before blowing into the buffer chamber. This prevents coal dust from entering the first nitrogen purging pipe and the desalinated water flushing pipe, causing blockages, and prevents the timed flushing device from malfunctioning. Through timed cyclical purging, it is ensured that the radar level gauge antenna cannot accumulate thick coal dust and sludge, allowing the radar level gauge to accurately measure the coal in the distillation buffer chamber.

[0015] The first and second filter pressure reducing valves designed in this utility model can not only regulate nitrogen pressure, but also filter impurities and moisture in the nitrogen in the nitrogen pipe, prevent the second and third solenoid valves from being blocked, and extend the service life of the solenoid valves; the first and second shut-off valves are set to facilitate the online replacement of the first solenoid valve. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] The meanings of the reference numerals in the attached diagram are as follows: 1. Drying oven; 2. Drying oven feed pipe; 3. Drying oven screw motor; 4. Chain bucket conveyor; 5. Chain bucket conveyor screw motor; 6. Chain bucket conveyor feed pipe; 7. Buffer bin; 8. Radar level gauge measuring connecting pipe; 9. Radar level gauge; 10. Demineralization pipe; 11. Demineralized water flushing pipe; 12. First shut-off valve; 13. First solenoid valve; 14. Second shut-off valve; 15. PLC; 16. Nitrogen pipe; 17. 18. First nitrogen purge pipe; 19. Third shut-off valve; 20. First filter pressure reducing valve; 21. Second solenoid valve; 22. Fourth shut-off valve; 23. Second nitrogen purge pipe; 24. Third nitrogen purge pipe; 25. Fourth nitrogen purge pipe; 26. Fifth shut-off valve; 27. Second filter pressure reducing valve; 28. Third solenoid valve; 29. ​​Sixth shut-off valve; 30. Seventh shut-off valve; 31. First check valve; 32. Second check valve; 33. Antenna. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 1As shown, a timed cleaning device for a radar level gauge antenna in a dry distillation buffer silo includes a drying furnace 1, a drying furnace feed pipe 2, a drying furnace screw motor 3, a chain bucket conveyor 4, a chain bucket conveyor screw motor 5, a chain bucket conveyor feed pipe 6, and a buffer silo 7 arranged in sequence. A radar level gauge measuring connecting pipe 8 passes through the top of the buffer silo 7, and a radar level gauge 9 is installed on the top of the radar level gauge measuring connecting pipe 8. A desalination mechanism is installed on the radar level gauge measuring connecting pipe 8, which includes a desalination pipe 10 and a desalination flushing pipe 11 connected to the desalination pipe. The outlet end of the desalination flushing pipe 11 passes through the side wall of the radar level gauge measuring connecting pipe 8. The outlet ends of the desalination flushing pipe 11 and the first nitrogen purging pipe 17 both face the antenna 32 of the radar level gauge 9. A first shut-off valve 12, a first solenoid valve 13, and a second shut-off valve 14 are arranged in sequence along the water flow direction on the desalination flushing pipe 11. The radar level gauge 9 and the first solenoid valve 13 are electrically connected to a PLC 15.

[0020] The radar level gauge measuring connecting pipe 8 is also equipped with a demineralized water drying mechanism. The demineralized water drying mechanism includes a nitrogen pipe 16 and a first nitrogen purging pipe 17 connected to the nitrogen pipe 16. The first nitrogen purging pipe 17 passes through the side wall of the radar level gauge measuring connecting pipe 8. A third shut-off valve 18, a first filter pressure reducing valve 19, a second solenoid valve 20, and a fourth shut-off valve 21 are sequentially arranged on the first nitrogen purging pipe 17 along the gas flow direction. The second solenoid valve 20 is electrically connected to the PLC 15.

[0021] The nitrogen pipe 16 is also equipped with a second nitrogen purge pipe 22. The second nitrogen purge pipe 22 is equipped with a third nitrogen purge pipe 23 and a fourth nitrogen purge pipe 24. The outlet end of the third nitrogen purge pipe 23 is connected to the first nitrogen purge pipe 17, and the outlet end of the fourth nitrogen purge pipe 24 is connected to the demineralized water flushing pipe 11. The second nitrogen purge pipe 22 is equipped with a fifth shut-off valve 25, a second filter pressure reducing valve 26, a third solenoid valve 27, and a sixth shut-off valve 28 in sequence along the gas flow direction. The outlet end of the second nitrogen purge pipe 22 is equipped with a seventh shut-off valve 29. The third solenoid valve 27 is electrically connected to the PLC 15. The third nitrogen purge pipe 23 is equipped with a first check valve 30, and the fourth nitrogen purge pipe 24 is equipped with a second check valve 31.

[0022] By setting the activation times of the first solenoid valve 13, the second solenoid valve 20, and the third solenoid valve 27 on the PLC 15 by the instrument maintenance technician, the PLC 15 can first open the first solenoid valve 13 at a set time to ensure that the demineralized water can be used to flush the coal dust sludge on the antenna 32 of the radar level gauge 9 at regular intervals through the demineralized water flushing pipe 11. After the demineralized water reaches the flushing time, the PLC 15 closes the first solenoid valve 13 and immediately opens the second solenoid valve 20. After the nitrogen pressure delivered by the nitrogen pipe 16 is reduced from 0.7MPa to 0.5MPa through the first filter pressure reducing valve 19, the residual demineralized water on the antenna 32 is dried through the first nitrogen purging pipe 17. After the purging reaches the preset time (15 seconds), the PLC... 15. Close the second solenoid valve 20. Open the third solenoid valve 27. After the nitrogen gas supplied by the nitrogen pipe 16 at a pressure of 0.7MPa is reduced to 0.7KPa through the second filter pressure reducing valve 26, it is supplied to the third nitrogen purging pipe 23 and the fourth nitrogen purging pipe 24 through the second nitrogen purging pipe 22 respectively. This ensures that the inside of the first nitrogen purging pipe 17 and the demineralized water flushing pipe 11 is kept under positive pressure and blown into the buffer chamber 7. This prevents coal dust from entering the first nitrogen purging pipe 17 and the demineralized water flushing pipe 11 and causing blockage. It also prevents the timed flushing device from failing. Through timed cyclic purging, it can be ensured that the radar level gauge antenna cannot accumulate thick coal dust sludge.

[0023] The PLC 15 sets the operating time and sequence of the first solenoid valve 13, the second solenoid valve 20, and the third solenoid valve 27 as follows: every 2 hours on the hour, the third solenoid valve 27 is closed, the first solenoid valve 13 is opened for 15 seconds after a 2-second interval, the first solenoid valve 13 is then closed, the second solenoid valve 20 is opened for 15 seconds after a 2-second interval, the second solenoid valve 20 is then closed, and the third solenoid valve 27 is opened for 2 seconds after a 2-second interval until the cycle repeats.

Claims

1. A retort buffer bin radar level gauge antenna timing cleaning device, comprising a drying furnace, a drying furnace discharge pipe, a drying furnace screw motor, a chain bucket conveyor, a chain bucket machine screw motor, a chain bucket machine discharge pipe and a buffer bin arranged in sequence, a radar liquid level gauge measurement communication pipe is arranged at the top of the buffer bin, and a radar liquid level gauge is arranged at the top of the radar liquid level gauge measurement communication pipe, characterized in that: A desalination mechanism is provided on the radar level gauge measuring connecting pipe (8). The desalination mechanism includes a desalination pipe (10) and a desalination flushing pipe (11) connected to the desalination pipe. The outlet end of the desalination flushing pipe (11) passes through the side wall of the radar level gauge measuring connecting pipe (8). A first shut-off valve (12), a first solenoid valve (13), and a second shut-off valve (14) are sequentially arranged on the desalination flushing pipe (11) along the water flow direction. The radar level gauge (9) and the first solenoid valve (13) are electrically connected to the PLC (15) respectively. ​ 2. The pyro-processing silo radar level gauge antenna timed washdown apparatus of claim 1 wherein: The radar level gauge measuring connecting pipe (8) is also provided with a demineralized water drying mechanism. The demineralized water drying mechanism includes a nitrogen pipe (16) and a first nitrogen purging pipe (17) connected to the nitrogen pipe (16). The first nitrogen purging pipe (17) is installed inside the side wall of the radar level gauge measuring connecting pipe (8). A third shut-off valve (18), a first filter pressure reducing valve (19), a second solenoid valve (20), and a fourth shut-off valve (21) are sequentially arranged on the first nitrogen purging pipe (17) along the gas flow direction. The second solenoid valve (20) is electrically connected to the PLC (15).

3. The pyro-processing silo radar level gauge antenna timed washdown apparatus of claim 2, wherein: The nitrogen pipe (16) is also provided with a second nitrogen purge pipe (22), and a third nitrogen purge pipe (23) and a fourth nitrogen purge pipe (24) are provided on the second nitrogen purge pipe (22). The outlet end of the third nitrogen purge pipe (23) is connected to the first nitrogen purge pipe (17), and the outlet end of the fourth nitrogen purge pipe (24) is connected to the demineralized water flushing pipe (11).

4. The timed cleaning device for the radar level gauge antenna of the dry distillation buffer silo as described in claim 3, characterized in that: The second nitrogen purge pipe (22) is provided with a fifth shut-off valve (25), a second filter pressure reducing valve (26), a third solenoid valve (27), and a sixth shut-off valve (28) in sequence along the gas flow direction. The outlet end of the second nitrogen purge pipe (22) is provided with a seventh shut-off valve (29). The third solenoid valve (27) is electrically connected to the PLC (15).

5. The timed cleaning device for the radar level gauge antenna of the dry distillation buffer silo as described in claim 4, characterized in that: The third nitrogen purge pipe (23) is equipped with a first check valve (30), and the fourth nitrogen purge pipe (24) is equipped with a second check valve (31).

6. The timed cleaning device for the radar level gauge antenna of the dry distillation buffer silo as described in claim 5, characterized in that: The outlet ends of the demineralized water flushing pipe (11) and the first nitrogen purging pipe (17) are both directed toward the antenna (32) of the radar level gauge (9).

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