Anhydrous ammonia rich liquid tar knockout device

Abstract

This utility model discloses a tar separation device in anhydrous ammonia-rich liquor, comprising a tar storage tank, a tar separator, a clear liquid tank, and an oil scraping structure. The tar storage tank is located on one side of the tar separator, and the clear liquid tank is located on the other side. The oil scraping structure is located at the top of the tar separator and is used to scrape the tar in the rich liquor within the tar separator into the tar storage tank. The oil scraping structure includes a drive motor, a slide rail, a transmission mechanism, and an oil scraping plate. The slide rail is laid at the top of the tar separator. The output side of the drive motor is connected to the transmission mechanism, and the transmission mechanism is connected to the oil scraping plate. The drive motor is controlled by a PLC, driving the transmission mechanism to move the oil scraping plate along the slide rail, scraping the tar in the rich liquor within the tar separator into the tar storage tank. This utility model achieves automatic tar separation in anhydrous ammonia-rich liquor tar remover.

Description

Technical Field

[0001] This utility model relates to coal gas purification technology in the field of coal chemical industry, and more specifically, to a tar separation device in anhydrous ammonia-rich liquid. Background Technology

[0002] The raw coal gas produced during the coking process contains a large amount of ammonia. The conventional process for producing anhydrous ammonia is to absorb the ammonia from the raw coal gas using phosphoric acid. Under low-temperature conditions, NH3 in the coal gas is absorbed by a lean NH4H2PO4 solution to generate a rich (NH4)2HPO4 solution. Then, under high-temperature conditions, the rich (NH4)2HPO4 solution is desorbed to remove ammonia water, becoming a lean NH4H2PO4 solution. This lean solution is returned to the ammonia absorption tower for recycling, and the ammonia water is distilled to produce anhydrous ammonia. The raw coal gas produced during coking undergoes multi-stage purification before entering the phosphoric acid washing process. In addition to ammonia, the raw coal gas also contains a small amount of liquid tar. During the absorption of ammonia, the tar is also washed off. The tar usually enters a tar remover along with the rich solution, and after separation, it is removed manually. Since the rich solution comes from the ammonia absorption tower, the solution contains a large amount of free ammonia. The tar layer in the tar remover will prevent the free ammonia from overflowing and polluting the environment. Therefore, each time the tar in the tar remover is manually removed, a certain thickness of tar needs to be left to prevent the free ammonia from overflowing.

[0003] To address the removal of tar from anhydrous ammonia-rich liquor, since some tar needs to be retained to prevent free ammonia from overflowing and polluting the environment, most methods currently employ manual retrieval, removing a portion of the tar from the tar separator each time, leaving the remaining tar. However, there are currently no patents relating to methods, processes, or equipment for the automatic separation of tar from anhydrous ammonia-rich liquor. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a tar separation device in anhydrous ammonia-rich liquor, enabling automatic tar separation within the tar remover in anhydrous ammonia-rich liquor.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A tar separation device in anhydrous ammonia-rich liquor includes a tar storage tank, a tar separator, a clear liquor tank, and an oil scraping structure.

[0007] The tar storage tank is located on one side of the tar separator, and the clear liquid tank is located on the other side of the tar separator;

[0008] The oil scraping structure is located at the top of the tar separator and is used to scrape the tar in the rich liquid in the tar separator into the tar storage tank.

[0009] The oil scraping structure includes a drive motor, a slide rail, a transmission mechanism, and an oil scraper.

[0010] The slide rail is laid at the top of the tar separator;

[0011] The output side of the drive motor is connected to the transmission mechanism, and the transmission mechanism is connected to the oil scraper.

[0012] The drive motor is controlled by a PLC, which drives the transmission mechanism to move the scraper along the slide rail, scraping the tar in the rich liquid in the tar separator into the tar storage tank.

[0013] Preferably, the transmission mechanism includes a drive shaft, a driven shaft, and a lower driven shaft;

[0014] The drive shaft is arranged along the width of the tar separator, connected to the output side of the drive motor, and is mounted on the top of the tar separator near the tar storage tank via a fixed bracket;

[0015] The driven shaft is arranged along the width of the tar separator and is mounted on the top of the tar separator near the clear liquid tank via a fixed bracket;

[0016] There are two driven shafts, which are respectively located below the corresponding drive shaft and driven shaft;

[0017] Each of the drive shaft, the driven shaft, and the two lower driven shafts has a gear near both ends. A drive chain is wound around each gear on the same side, and the two ends of the drive chain are respectively connected to the two sides of the oil scraper.

[0018] Preferably, the upper end of the scraper is connected to a connecting shaft, and both ends of the connecting shaft are connected to scraper pulleys, which move along the slide rail.

[0019] Preferably, the oil scraper is further provided with a balancing mechanism, including a first lower driven shaft and two second gears provided on the transmission shaft and the driven shaft;

[0020] There are two first lower driven shafts, each positioned above the corresponding two lower driven shafts;

[0021] Each of the two first driven shafts is provided with two first gears, corresponding to the second gears;

[0022] Both the first gear and the second gear on the same side are wound with a first transmission chain, and the two ends of the first transmission chain are respectively connected to the two sides of the oil scraper near the center position.

[0023] Preferably, an end-point limit switch and a start-point limit switch are respectively provided on both sides of the slide rail;

[0024] The endpoint limit switch and the starting position limit switch are linked with the PLC.

[0025] Preferably, the tar separator is located on one side of the tar storage tank near the top and has a tar outlet on its side.

[0026] The tar separator is located on one side of the clear liquid tank and is equipped with a flow guide baffle.

[0027] Preferably, the tar separator is provided with a low-level overflow port, a medium-level overflow port and a high-level overflow port on one side of the clear liquid tank;

[0028] The low-level overflow port, the medium-level overflow port, and the high-level overflow port are respectively connected to the clear liquid tank through corresponding low-level water pipes, medium-level water pipes, and high-level water pipes;

[0029] The low-level water pipe, the medium-level water pipe, and the high-level water pipe are respectively equipped with low-level valves, medium-level valves, and high-level valves;

[0030] The low-level valve, the medium-level valve, and the high-level valve are linked with the PLC.

[0031] The present invention provides a tar separation device in anhydrous ammonia-rich liquor, which realizes automatic tar separation in the tar remover of anhydrous ammonia-rich liquor. No solution is carried out in the separated tar, and there is always a layer of tar on the liquid surface in the tar separator. A certain thickness of tar is always left to prevent the overflow of free ammonia in the rich liquor. At the same time, manual operation is eliminated, realizing automatic tar removal from anhydrous ammonia-rich liquor. Attached Figure Description

[0032] Figure 1 This is a front view schematic diagram of the tar separation device in anhydrous ammonia-rich liquor according to this utility model;

[0033] Figure 2 This is a schematic diagram of the oil scraping structure in the anhydrous ammonia-rich liquor tar separation device of this utility model;

[0034] Figure 3 yes Figure 2 A left-view diagram;

[0035] Figure 4 yes Figure 2 A schematic diagram of the AA direction. Detailed Implementation

[0036] To better understand the above-mentioned technical solution of this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0037] Combination Figures 1 to 4As shown, this utility model provides a tar separation device in anhydrous ammonia-rich liquor, including a tar storage tank 1, a tar separator 2, a clear liquid tank 3, and an oil scraping structure 4.

[0038] Tar storage tank 1 is located on one side of tar separator 2 (see...) Figure 1 The left side of the tar separator 2), and the clear liquid tank 3 are located on the other side of the tar separator 2 (see...). Figure 1 (Right side of medium tar separator 2).

[0039] The oil scraping structure 4 is located at the top of the tar separator 2 and is used to scrape the tar in the rich liquid in the tar separator 2 into the tar storage tank 1.

[0040] The oil scraping structure 4 includes a drive motor 401, a slide rail 402, a transmission mechanism, and an oil scraper 403.

[0041] Two slide rails 402 are installed, symmetrically and parallelly laid at the top of the tar separator 2.

[0042] The output side of the drive motor 401 is connected to the transmission mechanism, and the transmission mechanism is connected to the oil scraper 403.

[0043] The drive motor 401 is controlled by the PLC to start and stop. The drive transmission mechanism drives the scraper 403 to move along the slide rail 402, scraping the tar in the rich liquid in the tar separator 2 into the tar storage tank 1.

[0044] The rich liquor entering tar separator 2 from the ammonia absorption tower contains tar, and the density of the rich liquor solution is 1.20–1.25 mg / cm³. 3 The density of tar is 0.9–0.95 mg / cm³. 3 Tar floats above the rich solution. A scraper 403 scrapes the tar from the solution surface to one side of the tar separator 2. Because the density of tar is less than that of the solution, the liquid level is higher on the side with more tar. The liquid level on the other side is kept lower than the oil outlet. Tar flows out from the tar outlet 201. When the liquid levels on both sides of the scraper 403 are balanced, the tar stops flowing out, ensuring that the liquid flowing out of the tar outlet 201 is only tar and no solution. Some tar still does not flow out on one side of the tar outlet 201. When the scraper 403 returns to its initial position, the remaining tar is evenly spread on the solution surface, which can prevent free ammonia in the rich solution from overflowing.

[0045] Continue to combine Figures 1 to 4 As shown, the transmission mechanism includes a transmission shaft 404, a driven shaft 405, and a lower driven shaft 406.

[0046] The drive shaft 404 is arranged along the width of the tar separator 2, connected to the output side of the drive motor 401, and installed on the top of the tar separator 2 near the tar storage tank 1 via a fixed bracket.

[0047] The driven shaft 405 is also arranged along the width of the tar separator 2 and is installed on the top of the tar separator 2 near the clear liquid tank 3 via a fixed bracket.

[0048] Two driven shafts 406 are provided, which are respectively installed below the corresponding drive shaft 404 and driven shaft 405, and are also arranged along the width of the tar separator 2, with both ends installed on the side wall of the tar separator 2.

[0049] A gear 407 is provided near both ends of the drive shaft 404, driven shaft 405, and two lower driven shafts 406. A drive chain 408 is wound around the gear 407 on the same side. The two ends of the drive chain 408 are respectively connected to the two sides of the oil scraper 403 (near the lower end of the oil scraper 403).

[0050] The upper end of the scraper blade 403 is connected to a connecting shaft, and both ends of the connecting shaft are connected to scraper pulleys 409. The scraper pulleys 409 move along the slide rail 402, which also ensures that the scraper blade 403 always moves on the same horizontal plane.

[0051] Continue to combine Figures 2 to 4 As shown, the oil scraper 403 is also provided with a balancing mechanism to prevent the oil scraper 403 from tilting in the vertical direction. It includes a first lower driven shaft 410 and two second gears 411 provided on the transmission shaft 404 and the driven shaft 405. The two second gears 411 are symmetrically located on both sides of the central axis of the transmission shaft 404 and the driven shaft 405, respectively.

[0052] There are two first driven shafts 410, which are respectively located above the two corresponding driven shafts 406.

[0053] Each of the two first driven shafts 410 is equipped with two first gears 412, which correspond to the positions of the second gears 411.

[0054] A first transmission chain 413 is wound around the first gear 412 and the second gear 411 on the same side. The two ends of the first transmission chain 413 are respectively connected to the two sides of the oil scraper 403 near the center.

[0055] The slide rail 402 is equipped with an end limit switch 414 and a start position limit switch 415 on both sides. The end limit switch 414 is closer to the tar storage tank 1, and the start position limit switch 415 is closer to the clear liquid tank 3.

[0056] Both the end limit switch 414 and the start position limit switch 415 are linked to the PLC.

[0057] Continue to combine Figure 1 and Figure 2 As shown, the tar separator 2 is located on one side of the tar storage tank 1 near the top and has a tar outlet 201 on its side.

[0058] The tar separator 2 is located on one side of the clear liquid tank 3 and is equipped with a flow guide baffle 202.

[0059] The tar separator 2 is located on one side of the clear liquid tank 3 and is provided with a low liquid level overflow port 203, a medium liquid level overflow port 204 and a high liquid level overflow port 205.

[0060] The low-level overflow port 203, the medium-level overflow port 204, and the high-level overflow port 205 are connected to the clear liquid tank 3 through the corresponding low-level water pipe 206, medium-level water pipe 207, and high-level water pipe 208, respectively.

[0061] Low-level water pipe 206, medium-level water pipe 207, and high-level water pipe 208 are respectively equipped with low-level valve 209, medium-level valve 210, and high-level valve 211.

[0062] The low-level valve 209, medium-level valve 210, and high-level valve 211 are all linked to the PLC.

[0063] Continue to combine Figures 1 to 4 As shown, the tar separation device in the anhydrous ammonia-rich liquor of this utility model is automatically controlled by a PLC. The solution returning from the ammonia absorption tower enters through the rich liquor inlet 212 on the tar separator 2. Before discharging tar, the low-level valve 209 is opened to make the solution level lower than the lower edge of the scraper plate 403. Due to the presence of the guide baffle 202, the tar floats on the liquid surface inside the tar separator 2. The solution overflows to the clear liquid tank 3 through the lower edge of the guide baffle 202 and then through the low-level valve 209. When scraping is required, the PLC automatically controls the low-level valve 209 to close first, and then the liquid level is raised to the middle-level valve. After reaching position 210, the scraper 403 is activated to scrape the tar on the surface of the solution toward one side of the tar outlet 201. When the scraper 403 reaches the end limit switch 414, the intermediate liquid level valve 210 is closed, raising the liquid level of the solution to the position of the high liquid level valve 211. At this time, the tar flows out from the tar outlet 201 into the tar storage tank 1. After a period of time, the intermediate liquid level valve 210 and the low liquid level valve 209 are opened, so that the liquid level in the tar separator 2 is lower than the lower edge of the scraper 403. At the same time, the scraper 403 returns to the limit position away from the tar outlet 201, completing the automatic tar removal process.

[0064] The operation of the scraper 403 inside the tar separator 2 is achieved by the PLC controlling the drive motor 401. When tar needs to be discharged, the drive motor 401 rotates forward, and the scraper 403 moves towards the tar outlet 201 to the end limit switch 414 position. When the tar discharge is completed, the PLC controls the drive motor 401 to reverse, and the scraper 403 returns to the starting position limit switch 415.

[0065] The starting position limit switch 415 is installed on the slide rail 402 at a distance of 1 / 5 to 1 / 6 from the distance between the guide baffle 202 and the tar outlet 201, so as to ensure that there is always a layer of tar on the surface of the solution during the operation of the oil scraper 403, and to prevent free ammonia in the rich solution from overflowing and polluting the environment.

[0066] The end limit switch 414 is installed on the slide rail 402 at a position that is 1 / 5 to 1 / 10 of the distance between the guide baffle 202 and the tar outlet 201, so that as much tar as possible is discharged in each operation.

[0067] Example 1

[0068] This embodiment 1 provides a tar separation device in anhydrous ammonia-rich liquor. The distance between the guide baffle 202 and the tar outlet 201 inside the tar separator 2 is 3500 mm, and the height is 1400 mm. The height of the low-level overflow port 203 is 800 mm, the height of the medium-level overflow port 204 is 1000 mm, the height of the high-level overflow port 205 is 1200 mm, and the height of the tar outlet 201 is 1250 mm. The distance between the starting position limit switch 415 and the guide baffle 202 is 800 mm, and the distance between the ending position limit switch 414 and the tar outlet is... The distance between 201 and 202 is 400mm. The PLC control device operates on a timed basis, with an 8-hour cycle. After the low-level valve 209 is closed for 3 minutes, the drive motor 401 is started. During the operation of the drive motor 401, the scraper plate 403 moves towards the tar outlet 201 at a speed of 5m / min. After reaching the end limit switch 414, the medium-level valve 210 is closed. After 10 minutes, the low-level valve 209 and the medium-level valve 210 are opened, and the drive motor 401 is started in reverse. The scraper plate 403 moves to the starting position limit switch 415. The tar separation device in anhydrous ammonia-rich liquor of this embodiment 1 realizes the automatic separation of tar in anhydrous ammonia-rich liquor, eliminating the manual retrieval process. No solution is carried out in the separated tar, and a layer of tar is always present on the liquid surface in the tar separator 2, avoiding the overflow of free ammonia in the rich liquor.

[0069] Example 2

[0070] This embodiment 2 provides a tar separation device in anhydrous ammonia-rich liquor. The distance between the guide baffle 202 and the tar outlet 201 inside the tar separator 2 is 2800mm, and the height is 1450mm. The height of the low liquid level overflow port 203 is 850mm, the height of the medium liquid level overflow port 204 is 1100mm, the height of the high liquid level overflow port 205 is 1250mm, and the height of the tar outlet 201 is 1300mm. The distance between the starting position limit switch 415 and the guide baffle 202 is 600mm, and the distance between the ending position limit switch 414 and the tar outlet 201 is 350mm. The device adopts a manual button start-up mode. The tar separation device in anhydrous ammonia-rich liquor is started every 2-3 days. After clicking the start button, the low-level valve 209 is closed for 2 minutes, and then the drive motor 401 is started. During the operation of the drive motor 401, the scraper plate 403 moves towards the tar outlet 201 at a speed of 4 m / min. After reaching the end limit switch 414, the medium-level switch 210 is closed. After 20 minutes, the low-level valve 209 is opened, the medium-level valve 210 is opened, and the drive motor 209 is started in reverse. The scraper plate 403 moves to the starting position limit switch 415. The tar separation device in anhydrous ammonia-rich liquor of this embodiment 2 realizes the automatic separation of tar in anhydrous ammonia-rich liquor, eliminating the manual retrieval process. No solution is carried out in the separated tar, and a layer of tar is always present on the liquid surface in the tar separator 2, avoiding the overflow of free ammonia in the rich liquor.

[0071] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Any changes or modifications to the above embodiments within the scope of the essential spirit of the present utility model will fall within the scope of the claims of the present utility model.

Claims

1. A tar separation device for anhydrous ammonia-rich liquor, characterized in that: Includes tar storage tank, tar separator, clear liquid tank and oil scraping structure; The tar storage tank is located on one side of the tar separator, and the clear liquid tank is located on the other side of the tar separator; The oil scraping structure is located at the top of the tar separator and is used to scrape the tar in the rich liquid in the tar separator into the tar storage tank. The oil scraping structure includes a drive motor, a slide rail, a transmission mechanism, and an oil scraper. The slide rail is laid at the top of the tar separator; The output side of the drive motor is connected to the transmission mechanism, and the transmission mechanism is connected to the oil scraper. The drive motor is controlled by a PLC, which drives the transmission mechanism to move the scraper along the slide rail, scraping the tar in the rich liquid in the tar separator into the tar storage tank.

2. The tar separation device in anhydrous ammonia-rich liquor according to claim 1, characterized in that: The transmission mechanism includes a drive shaft, a driven shaft, and a lower driven shaft; The drive shaft is arranged along the width of the tar separator, connected to the output side of the drive motor, and is mounted on the top of the tar separator near the tar storage tank via a fixed bracket; The driven shaft is arranged along the width of the tar separator and is mounted on the top of the tar separator near the clear liquid tank via a fixed bracket; There are two driven shafts, which are respectively located below the corresponding drive shaft and driven shaft; Each of the drive shaft, the driven shaft, and the two lower driven shafts has a gear near both ends. A drive chain is wound around each gear on the same side, and the two ends of the drive chain are respectively connected to the two sides of the oil scraper.

3. The tar separation device in anhydrous ammonia-rich liquor according to claim 2, characterized in that: The upper end of the scraper is connected to a connecting shaft, and both ends of the connecting shaft are connected to scraper pulleys, which move along the slide rail.

4. The tar separation device in anhydrous ammonia-rich liquor according to claim 2, characterized in that: The oil scraper is also provided with a balancing mechanism, including a first lower driven shaft and two second gears provided on the drive shaft and the driven shaft; There are two first lower driven shafts, each positioned above the corresponding two lower driven shafts; Each of the two first driven shafts is provided with two first gears, corresponding to the second gears; Both the first gear and the second gear on the same side are wound with a first transmission chain, and the two ends of the first transmission chain are respectively connected to the two sides of the oil scraper near the center position.

5. The tar separation device in anhydrous ammonia-rich liquor according to claim 3, characterized in that: The slide rail is equipped with an end-point limit switch and a start-point limit switch on both sides. The endpoint limit switch and the starting position limit switch are linked with the PLC.

6. The tar separation device in anhydrous ammonia-rich liquor according to claim 1, characterized in that: The tar separator is located on one side of the tar storage tank, near the top, and has a tar outlet on its side. The tar separator is located on one side of the clear liquid tank and is equipped with a flow guide baffle.

7. The tar separation device in anhydrous ammonia-rich liquor according to claim 6, characterized in that: The tar separator is provided with a low-level overflow port, a medium-level overflow port and a high-level overflow port on one side of the clear liquid tank; The low-level overflow port, the medium-level overflow port, and the high-level overflow port are respectively connected to the clear liquid tank through corresponding low-level water pipes, medium-level water pipes, and high-level water pipes; The low-level water pipe, the medium-level water pipe, and the high-level water pipe are respectively equipped with low-level valves, medium-level valves, and high-level valves; The low-level valve, the medium-level valve, and the high-level valve are linked with the PLC.

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