A system for sampling and detecting tail gas from a graphite negative electrode granulation reactor

Abstract

The present invention discloses a system for sampling and detecting tail gas of a graphite negative electrode granulation reactor. During the backwashing process of the filter device, a driving mechanism drives a turntable to rotate back and forth between a first station and a second station. When the turntable is at the first station, each rod is located at one end of a corresponding slot hole. When the turntable is at the second station, each rod is located at the other end of the corresponding slot hole. In other words, the rod can scrape back and forth in the slot hole to scrape off the condensed tar on the hole wall of the slot hole; and because the rod also extends into the first cavity, the rod can also continuously stir the adsorbed particles in the first cavity when the turntable rotates. The present invention makes the backwashing effect of the filter device better and can more easily flush out the condensed tar in the filter device.

Description

Technical Field

[0001] The invention relates to the technical field of chemical engineering, in particular to a system for sampling and detecting tail gas from a graphite negative electrode granulation reactor. Background Art

[0002] In the existing production process of graphite negative electrode materials, the tail gas generated by the modification and coating in the granulation reactor mainly depends on the composition of coke raw materials (petroleum coke, needle coke, calcined coke) and coating asphalt. Among these two types of raw materials, the amount of coating asphalt is about 7%~18%, so the composition of the tail gas in the high-temperature modification process in the granulation reactor mainly depends on the composition of the coke raw materials. At present, in the production process, enterprises will adjust the types of coke raw materials in a timely manner according to market demand while ensuring product quality, which will cause the instability of tail gas composition. When high-quality low-sulfur coke is used, the sulfur content in the tail gas will be reduced accordingly; when coke raw materials of slightly lower quality are used, the content of sulfur-containing toxic substances in the tail gas will increase, which requires real-time detection of tail gas, so as to change the tail gas treatment process of the enterprise in time when the tail gas composition changes, so as to avoid the emission of toxic and harmful substances in the tail gas.

[0003] At present, gas analyzers are generally used to sample and analyze exhaust gas. In order to prevent the tar in the exhaust gas from condensing and clogging the pipes in the gas analyzer, the exhaust gas is generally filtered to remove the tar in the exhaust gas. The exhaust gas filtering device generally cools the exhaust gas first, and then uses adsorption particles to condense and adsorb the tar in the exhaust gas, and regularly uses high-temperature steam to backwash the filter device. The high-temperature steam can dissolve the condensed tar in the filter device and enter the sewage pipe with the high-temperature steam.

[0004] However, when the tar in the filter device condenses into a thicker tar layer, the high-temperature steam dissolves the tar more slowly, resulting in poor backwashing effect of the filter device. The condensed tar in the filter device cannot be completely washed away, which will affect the passage of exhaust gas in the filter device. Summary of the invention

[0005] The present application provides a system for sampling and detecting tail gas from a graphite negative electrode granulation reactor, which improves the backwashing effect of the filter device and can more easily flush out the condensed tar in the filter device.

[0006] The system for sampling and detecting tail gas from a graphite negative electrode granulation reactor provided in the present application comprises a filter device and an online gas analyzer which are sequentially arranged on the tail gas exhaust pipe of the granulation reactor, wherein the filter device is used to filter and remove tar from the tail gas discharged from the tail gas exhaust pipe, and the online gas analyzer is used to sample and analyze the tail gas after being filtered by the filter device;

[0007] The filtering device comprises a cylinder, a first end plate is arranged at one end of the cylinder, a first connecting hole is arranged on the first end plate, a first end of a three-way pipe is connected with the first connecting hole, a second end of the three-way pipe is used to discharge the filtered tail gas, a third end of the three-way pipe is used to connect the high-temperature steam, a second end plate is arranged at the other end of the cylinder, a second connecting hole is arranged on the second end plate, and the second connecting hole is used to discharge the high-temperature steam and the tar dissolved by the high-temperature steam;

[0008] A partition plate is provided in the cylinder, which divides the space in the cylinder along the axial direction. The area between the partition plate and the first end plate is the first cavity, and the area between the partition plate and the second end plate is the second cavity. An air inlet hole for receiving exhaust gas is provided on the cavity wall of the second cavity.

[0009] A heat exchange tube is arranged in the second cavity, a coolant inlet and a coolant outlet are arranged on the cavity wall of the second cavity, and both ends of the heat exchange tube are respectively connected to the coolant inlet and the coolant outlet;

[0010] A plurality of slot groups are arranged on the partition plate, each slot group comprises a plurality of slots evenly spaced around the axis of the partition plate, each slot has the same central angle, the first cavity is filled with adsorption particles, and the slot width of the slot is smaller than the diameter of the adsorption particles;

[0011] A rotating disk is arranged in the second cavity, the rotating disk is parallel to the partition plate, a connecting seat is arranged on one surface of the rotating disk, the rotating disk is rotatably connected to the partition plate through the connecting seat, a plurality of rods are vertically arranged on one surface of the rotating disk, the rods are arranged one by one corresponding to the slots, and each rod passes through the corresponding slot and extends into the first cavity;

[0012] The turntable is driven by a driving mechanism to reciprocate between the first station and the second station. When the turntable is at the first station, each rod is located at one end of the corresponding slot; when the turntable is at the second station, each rod is located at the other end of the corresponding slot.

[0013] Preferably, the driving mechanism includes a power component, a first connecting shaft, a first bevel gear, a second connecting shaft and a second bevel gear, the second bevel gear is coaxially connected to the other surface of the turntable through the second connecting shaft, the first bevel gear is coaxially connected to the rotating shaft of the power component through the first connecting shaft, the first bevel gear is meshed with the second bevel gear, and the power component is used to drive the first bevel gear to rotate reciprocatingly to drive the turntable to rotate reciprocatingly between the first station and the second station.

[0014] Preferably, the power component is a hydraulic motor.

[0015] Preferably, each slot group includes four slots with a central angle of 35 degrees.

[0016] Preferably, the heat exchange tube extends back and forth in the second cavity.

[0017] Preferably, the adsorption particles are quartz glass beads.

[0018] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0019] When the system of the present application is working, the filter device is connected in series to the exhaust pipe, and the exhaust gas enters the second cavity from the air inlet hole, and the coolant is continuously introduced into the heat exchange tube, so that the heat exchange tube cools the exhaust gas, and then the exhaust gas flows into the first cavity through the slots on the partition plate, and the tar contained in the exhaust gas condenses on the adsorption particles, and then the exhaust gas is discharged to the exhaust pipe through the second end of the three-way pipe, and then the online gas analyzer samples and analyzes the filtered exhaust gas. When the filter device needs to be backwashed, the third end of the three-way pipe is connected to high-temperature steam, and the high-temperature steam is used to flush the adsorption particles, the partition plate, and the heat exchange tube, so that the condensed tar on the adsorption particles, the partition plate and the heat exchange tube is dissolved and discharged from the second connecting hole with the high-temperature steam. Since the adsorption particles and the slots on the partition plate are prone to accumulate thick tar layers and are not easy to be flushed, during this process, the drive mechanism drives the turntable to The turntable reciprocates between the first station and the second station. When the turntable is in the first station, each rod is located at one end of the corresponding slot, and when the turntable is in the second station, each rod is located at the other end of the corresponding slot, that is to say, the rod can scrape back and forth in the slot to scrape off the condensed tar on the hole wall of the slot, and the condensed tar scraped off can be easily taken away by the high-temperature steam; and because the rod also extends into the first cavity, the rod can also continuously stir the adsorption particles in the first cavity when the turntable rotates. The adsorption particles are stirred, which makes the condensed tar on the adsorption particles easy to fall off and thus be taken away by the high-temperature steam. In this way, the backwashing effect of the filter device is better, and the condensed tar in the filter device can be more easily rinsed clean, thereby avoiding the slots on the partition plate and the tar on the adsorption particles not being removed cleanly, affecting the passage of exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 is a schematic diagram of the structure of the filtering device;

[0023] Figure 3 is a schematic diagram of the structure of the partition plate;

[0024] Figure 4 is a schematic diagram of the structure of the turntable;

[0025] Figure 5 It is a structural diagram of the online gas analyzer.

[0026] The reference numerals are as follows: 10, granulation reactor; 11, first tail gas exhaust pipe; 20, cooling reactor; 21, second tail gas exhaust pipe; 30, online gas analyzer; 40, filtering device; 41, cylinder; 411, first end plate; 4111, first connecting hole; 412, second end plate; 4121, second connecting hole; 4122, drain pipe; 42, partition plate; 421, first cavity; 4211, adsorption particles; 422, second cavity; 423, groove Hole; 43, three-way pipe; 431, outlet pipe; 432, steam inlet pipe; 45, air inlet hole; 451, air inlet pipe; 46, heat exchange tube; 461, coolant inlet; 4611, coolant inlet pipe; 462, coolant outlet; 4621, coolant outlet pipe; 47, turntable; 471, connecting seat; 472, rod; 481, power component; 482, first connecting shaft; 483, first bevel gear; 484, second connecting shaft; 485, second bevel gear. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or server that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or modules that are not clearly listed or inherent to these processes, methods, products, or devices.

[0029] like Figure 1~Figure 5As shown, the system for sampling and detecting the exhaust gas of the graphite negative electrode granulation reactor of this embodiment includes a filtering device 40 and an online gas analyzer 30 which are sequentially arranged on the first exhaust gas exhaust pipe 11 of the granulation reactor 10. The filtering device 40 is used to filter and remove tar in the exhaust gas discharged from the exhaust pipe, and the online gas analyzer 30 is used to sample and analyze the exhaust gas after being filtered by the filtering device 40.

[0030] The filtering device 40 includes a cylinder 41, a first end plate 411 is provided at one end of the cylinder 41, the first end plate 411 is sealed and connected to the cylinder 41, a first connecting hole 4111 is provided on the first end plate 411, a first end of a three-way pipe 43 is connected to the first connecting hole 4111, a second end of the three-way pipe 43 is used to discharge filtered exhaust gas, the second end of the three-way pipe 43 is connected to the exhaust pipe 431, the third end of the three-way pipe 43 is used to connect high-temperature steam, and the third end of the three-way pipe 43 is connected to the steam inlet pipe 432.

[0031] A second end plate 412 is provided at the other end of the cylinder 41 , and the second end plate 412 is sealed and connected to the cylinder 41 . A second connecting hole 4121 is provided on the second end plate 412 , and the second connecting hole 4121 is used to discharge high-temperature steam and tar dissolved by the high-temperature steam. The second connecting hole 4121 is connected to a sewage pipe 4122 .

[0032] A partition plate 42 is provided in the cylinder 41, and the partition plate 42 is perpendicular to the axis of the cylinder 41. The periphery of the partition plate 42 is sealed and connected to the inner wall of the cylinder 41. The partition plate 42 divides the space in the cylinder 41 into a first cavity 421 and a second cavity 422 along the axial direction. The area between the partition plate 42 and the first end plate 411 is the first cavity 421, and the area between the partition plate 42 and the second end plate 412 is the second cavity 422. An air inlet 45 for receiving exhaust gas is provided on the cavity wall of the second cavity 422, and the air inlet 45 is connected to the air inlet pipe 451.

[0033] A heat exchange tube 46 is provided in the second cavity 422. The heat exchange tube 46 extends back and forth in the second cavity 422. A coolant inlet 461 and a coolant outlet 462 are provided on the cavity wall of the second cavity 422. Both ends of the heat exchange tube 46 are respectively connected to the coolant inlet 461 and the coolant outlet 462. The coolant inlet 461 is connected to the coolant inlet pipe 4611, and the coolant outlet 462 is connected to the coolant outlet pipe 4621.

[0034] A plurality of slot groups are provided on the partition plate 42, each slot group includes four slots 423 evenly spaced around the axis of the partition plate 42, the central angle of each slot 423 is 35 degrees, the first cavity 421 is filled with adsorption particles 4211, the slot width of the slot 423 is smaller than the diameter of the adsorption particles 4211, so that the adsorption particles 4211 cannot pass through the slot 423 and pass through the partition plate 42.

[0035] A turntable 47 is provided in the second cavity 422. The turntable 47 is close to the partition plate 42 and is parallel to the partition plate 42. A connecting seat 471 is provided on one surface of the turntable 47. The turntable 47 is rotatably connected to the partition plate 42 through the connecting seat 471. That is to say, the partition plate 42 is fixedly provided in the cylinder 41, and the turntable 47 can rotate relative to the partition plate 42. A plurality of rods 472 are vertically provided on one surface of the turntable 47. The rods 472 are fixedly connected to the turntable 47. The rods 472 and the slots 423 are provided one by one. Each rod 472 passes through the corresponding slot 423 and extends into the first cavity 421.

[0036] The turntable 47 is driven by a driving mechanism to reciprocate between the first station and the second station. When the turntable 47 is in the first station, each rod 472 is located at one end of the corresponding slot 423; when the turntable 47 is in the second station, each rod 472 is located at the other end of the corresponding slot 423. That is to say, when the turntable 47 reciprocates, each rod 472 can scrape back and forth in the corresponding slot 423, and the rod 472 can also stir in the first cavity 421.

[0037] The driving mechanism includes a power component 481, a first connecting shaft 482, a first bevel gear 483, a second connecting shaft 484 and a second bevel gear 485. The second bevel gear 485 is coaxially connected to the other surface of the turntable 47 through the second connecting shaft 484, and the two ends of the second connecting shaft 484 are fixedly connected to the second bevel gear 485 and the turntable 47 respectively. The first bevel gear 483 is coaxially connected to the rotating shaft of the power component 481 through the first connecting shaft 482, and the two ends of the first connecting shaft 482 are fixedly connected to the rotating shaft of the first bevel gear 483 and the power component 481 respectively. The first bevel gear 483 is meshed with the second bevel gear 485. The power component 481 is used to drive the first bevel gear 483 to rotate reciprocatingly, so as to drive the turntable 47 to rotate reciprocatingly between the first station and the second station.

[0038] The power component 481 is a hydraulic motor.

[0039] The adsorption particles 4211 are quartz glass beads, which have good high temperature resistance.

[0040] When the system of the present application is working, the filtering device 40 is connected in series to the first tail gas exhaust pipe 11 of the granulation reactor 10 through the air inlet pipe 451 and the air outlet pipe 431, the valves on the steam inlet pipe 432 and the sewage pipe 4122 are closed, and the valves on the air inlet pipe 451, the air outlet pipe 431, the coolant inlet pipe 4611 and the coolant outlet pipe 4621 are opened, and the tail gas enters the second cavity 422 through the air inlet pipe 451, and the coolant is continuously introduced into the heat exchange pipe 46, so that the heat exchange pipe 46 cools down the tail gas, and then the tail gas flows into the first cavity 421 through the slot 423 on the partition plate 42, and the tar contained in the tail gas condenses on the adsorption particles 4211, and then the tail gas is discharged through the air outlet pipe 431, and then The online gas analyzer 30 samples and analyzes the filtered exhaust gas. When the filter device 40 needs to be backwashed, the valves on the steam inlet pipe 432 and the drain pipe 4122 are opened, and the valves on the air inlet pipe 451, the air outlet pipe 431, the coolant inlet pipe 4611 and the coolant outlet pipe 4621 are closed. The steam inlet pipe 432 is connected to the high-temperature steam, and the high-temperature steam flushes the adsorption particles 4211, the partition plate 42, and the heat exchange tube 46, so that the condensed tar on the adsorption particles 4211, the partition plate 42 and the heat exchange tube 46 is dissolved and discharged from the drain pipe 4122 with the high-temperature steam. Since the gaps between the adsorption particles 4211 are small, and the slots 423 on the partition plate 42 are also large, the adsorption particles 4211 are not too large. The adsorbed particles 4211 and the condensed tar on the slots 423 are very small. If there is any residue on the adsorbed particles 4211 and the slots 423, the gas flow path will be blocked. Therefore, during the backwashing process, the power component 481 drives the first bevel gear 483 to rotate back and forth, and the first bevel gear 483 drives the turntable 47 to rotate back and forth synchronously through the second bevel gear 485, so that the turntable 47 rotates back and forth between the first station and the second station. When the turntable 47 is in the first station, each rod 472 is located at one end of the corresponding slot 423, and when the turntable 47 is in the second station, each rod 472 is located at the other end of the corresponding slot 423, that is to say, the rod 472 can scrape back and forth in the corresponding slot 423 to make the slot The condensed tar on the hole wall of the hole 423 is scraped off, and the condensed tar scraped off can be easily taken away by the high-temperature steam; and because the rod 472 also extends into the first cavity 421, the rod 472 can also continuously stir the adsorption particles 4211 in the first cavity when the turntable 47 reciprocates. The adsorption particles 4211 are stirred, and the condensed tar on the adsorption particles 4211 is easy to fall off and thus be taken away by the high-temperature steam. In this way, the backwashing effect of the filter device 40 is better, and the condensed tar in the filter device 40 can be more easily washed away, thereby avoiding the slots 423 on the partition plate 42 and the tar on the adsorption particles 4211 not being removed cleanly, thereby affecting the passage of exhaust gas.

[0041] In addition, a cooling kettle 20 is further provided at the rear end of the granulation reactor 10 . The cooling kettle 20 is provided with a second tail gas exhaust pipe 21 . The second tail gas exhaust pipe 21 is also provided with an online gas analyzer 30 .

[0042] It should be noted that the above-mentioned sequence of the embodiments of the present application is only for description and does not represent the advantages and disadvantages of the embodiments. And the above-mentioned specific embodiments of this specification are described. Other embodiments are within the scope of the attached claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0043] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

[0044] This specification and drawings are merely exemplary illustrations of the present application and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, a person skilled in the art may make various modifications and variations to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the present application and its equivalents, the present application intends to include these modifications and variations.

Claims

1. A system for sampling and detecting tail gas from a graphite negative electrode granulation reactor, characterized in that: It comprises a filtering device (40) and an online gas analyzer (30) which are sequentially arranged on the tail gas exhaust pipe of a granulation reactor, the filtering device (40) being used to filter and remove tar in the tail gas discharged from the tail gas exhaust pipe, and the online gas analyzer (30) being used to sample and analyze the tail gas after being filtered by the filtering device (40); The filtering device (40) comprises a cylinder (41), a first end plate (411) being provided at one end of the cylinder (41), a first connecting hole (4111) being provided on the first end plate (411), a first end of a three-way pipe (43) being connected to the first connecting hole (4111), a second end of the three-way pipe (43) being used to discharge filtered exhaust gas, a third end of the three-way pipe (43) being used to receive high-temperature steam, a second end plate (412) being provided at the other end of the cylinder (41), a second connecting hole (4121) being provided on the second end plate (412), and the second connecting hole (4121) being used to discharge high-temperature steam and tar dissolved by the high-temperature steam; A partition plate (42) is provided in the cylinder (41), and the partition plate (42) divides the space in the cylinder (41) in the axial direction; the area between the partition plate (42) and the first end plate (411) is a first cavity (421); the area between the partition plate (42) and the second end plate (412) is a second cavity (422); and an air inlet (45) for receiving exhaust gas is provided on the cavity wall of the second cavity (422); A heat exchange tube (46) is arranged in the second cavity (422); a cooling liquid inlet (461) and a cooling liquid outlet (462) are arranged on the cavity wall of the second cavity (422); and two ends of the heat exchange tube (46) are respectively connected to the cooling liquid inlet (461) and the cooling liquid outlet (462); A plurality of slot groups are provided on the partition plate (42), each slot group comprises a plurality of slots (423) uniformly spaced and distributed circumferentially around the axis of the partition plate (42), the central angle of each slot (423) being the same, the first cavity (421) being filled with adsorption particles (4211), and the slot width of the slot (423) being smaller than the diameter of the adsorption particles (4211); A rotating disk (47) is disposed in the second cavity (422), the rotating disk (47) being parallel to the partition plate (42), a connecting seat (471) being disposed on one surface of the rotating disk (47), the rotating disk (47) being rotatably connected to the partition plate (42) via the connecting seat (471), a plurality of rods (472) being vertically disposed on one surface of the rotating disk (47), the rods (472) being disposed in one-to-one correspondence with the slots (423), and each rod (472) passing through a corresponding slot (423) and extending into the first cavity (421); The turntable (47) is driven by a driving mechanism to reciprocate between a first working position and a second working position. When the turntable (47) is at the first working position, each rod (472) is located at one end of a corresponding slot hole (423); when the turntable (47) is at the second working position, each rod (472) is located at the other end of a corresponding slot hole (423).

2. The system according to claim 1, characterized in that The driving mechanism comprises a power component (481), a first connecting shaft (482), a first bevel gear (483), a second connecting shaft (484) and a second bevel gear (485); the second bevel gear (485) is coaxially connected to the other surface of the turntable (47) via the second connecting shaft (484); the first bevel gear (483) is coaxially connected to the rotating shaft of the power component (481) via the first connecting shaft (482); the first bevel gear (483) is meshed with the second bevel gear (485); the power component (481) is used to drive the first bevel gear (483) to reciprocate, so as to drive the turntable (47) to reciprocate between the first station and the second station.

3. The system according to claim 2, characterized in that The power component (481) is a hydraulic motor.

4. The system according to claim 1, characterized in that Each slot hole group includes four slot holes (423) with a central angle of 35 degrees.

5. The system according to claim 1, characterized in that The heat exchange tube (46) extends in a manner of bending back and forth within the second cavity (422).

6. The system according to claim 1, characterized in that The adsorption particles (4211) are quartz glass beads.

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