Tank field VOCs tail gas recovery device

Abstract

The utility model belongs to the technical field of tail gas recovery, and particularly relates to a tank area VOCs tail gas recovery device which comprises a reaction box and supporting legs, and the supporting legs are fixedly connected to the front end and the rear end below the left side and the right side of the reaction box. According to the tank area VOCs tail gas recovery device, when flue gas generated after incineration of a heating furnace is treated, a first motor and a second motor are started firstly, a first rotating shaft and a second rotating shaft are driven to rotate to drive stirring blades to rotate together, a desulfurization and denitrification catalyst in a reaction box is continuously turned over, then the flue gas is introduced into the bottom end of the interior of the reaction box through a gas inlet pipe, and the flue gas is discharged through a gas outlet pipe; then the flue gas floats rightwards at the lower end part of the partition plate on the inner side of the reaction box, floats upwards from a gap between the partition plate and the right end of the inner side of the reaction box, floats leftwards at the part above part of the partition plate in the reaction box, and finally floats out from an exhaust pipe; in the floating process in the reaction box, the desulfurization and denitrification catalyst is in full contact with the desulfurization and denitrification catalyst to be desulfurized and denitrified.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas recovery technology, specifically a VOCs exhaust gas recovery device for tank farms. Background Technology

[0002] The tar plant has five sections: storage and transportation, distillation, tar production, naphthalene washing, and asphalt production. During production, the main sources of VOCs in the exhaust gas are: storage tank operation, loading and unloading, vacuum system operation, and the packaging of mixed naphthalene solids. Currently, the plant treats VOCs exhaust gas using an exhaust gas scrubbing tower. After scrubbing, the exhaust gas is sent to a tubular heater for incineration via an induced draft fan. The sulfur content of the VOCs exhaust gas varies from 500-3500 mg / m³. After incineration, the measured average SO₂ content in the heater's flue gas is 200-2500 mg / m³.

[0003] However, according to the emission control requirements for air pollutants in the Petrochemical Industry Pollutant Emission Standard (GB 31571-2015), which stipulates that "the emission limit for particulate matter is 20 mg / m3, the emission limit for SO2 is 100 mg / m3, and the emission limit for nitrogen oxides is 150 mg / m3", the emissions from the heating furnace flue gas exceed the standards. Therefore, desulfurization and denitrification treatment are still required after the heating furnace is incinerated.

[0004] For example, a desulfurization and denitrification device disclosed in Chinese patent CN207102339U uses a baffle plate to allow flue gas to pass through the through holes on the baffle plate before being output through the output pipe, thereby increasing the contact time between the flue gas and the desulfurization and denitrification catalyst and improving the desulfurization effect. Furthermore, the left and right rotating shafts can be rotated simultaneously by the left and right motors, thereby stirring the desulfurization and denitrification catalysts that have lost their effectiveness and those that have not been fully used, thus improving the utilization rate of the desulfurization and denitrification catalysts.

[0005] However, when the equipment performs desulfurization and denitrification, the flue gas enters the reaction chamber through the input pipe and floats directly upwards, passing through the desulfurization and denitrification catalyst and then through the through holes in the upper partition and the output pipe to be discharged. As a result, the flue gas remains in the reaction chamber for a relatively short time, resulting in limited desulfurization and denitrification effects.

[0006] Therefore, we urgently need to provide a VOCs tail gas recovery device for tank areas that can guide flue gas to float in the reaction tank for a long time. Utility Model Content

[0007] The purpose of this invention is to provide a VOCs tail gas recovery device for tank farms, in order to solve the problem mentioned in the background art that the flue gas is still in the reaction tank for a relatively short time, resulting in limited desulfurization and denitrification effects.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a VOCs tail gas recovery device for tank farms, comprising a reaction chamber and support legs, wherein the support legs are fixedly connected to the front and rear ends of the lower left and right sides of the reaction chamber, an air inlet pipe is fixedly connected to the lower left end of the reaction chamber, an exhaust pipe is fixedly connected to the upper left side of the reaction chamber, and purification mechanisms are provided at the inner and outer ends of the reaction chamber.

[0009] The purification mechanism includes a first motor installed at the upper and lower ends of the left front of the reaction chamber, with a first rotating shaft fixedly connected to the right end of the output shaft of the first motor. A second motor is installed at the upper and lower ends of the left rear of the reaction chamber, with a second rotating shaft fixedly connected to the right end of the output shaft of the second motor. Stirring blades are fixedly connected to the outer sides of the first and second rotating shafts. A base plate is connected to the lower end of the reaction chamber. A partition plate is connected to the middle position inside the reaction chamber. A disassembly unit is provided at the outer end of the reaction chamber.

[0010] A further improvement is that the disassembly unit includes a rectangular frame fixedly connected to the left side of the reaction chamber. A spring is fixedly connected to the middle position of the top of the inner side of the rectangular frame. An annular plate is fixedly connected to the lower end of the spring. A plug rod is fixedly connected to the inner side of the annular plate. A threaded rod is connected to the middle position of the left end inside the base plate. A rotating handle is welded to the lower end of the threaded rod.

[0011] A further improvement is that the left end of the partition plate is located in the middle of the left side of the reaction chamber, and there is a gap between the right end of the partition plate and the right side of the reaction chamber. The reaction chamber is filled with a desulfurization and denitrification catalyst, so that the flue gas entering the bottom of the reaction chamber from the intake pipe will drift to the right at the lower end of the partition plate inside the reaction chamber, then drift upward through the gap between the partition plate and the right side of the reaction chamber, then drift to the left at the part above the partition plate inside the reaction chamber, and finally drift out from the exhaust pipe.

[0012] A further improvement is that the stirring blades on the outer side of the first rotating shaft and the stirring blades on the outer side of the second rotating shaft are fixed in an alternating discharge manner. The alternating fixed stirring blades allow more desulfurization and denitrification catalysts to come into contact with the reaction tank when the stirring blades rotate, thereby making the desulfurization and denitrification catalysts more evenly agitated.

[0013] A further improvement is that a circular hole is provided at the middle position of the upper and lower ends inside the rectangular frame, and the outer side of the insertion rod is slidably connected to the inner side of the circular hole, so that when the spring moves the annular plate, the insertion rod can slide along the inner side of the circular hole.

[0014] A further improvement is that a through groove is provided at the middle position of the left end of the reaction chamber, the outer side of the partition plate is slidably connected to the inner side of the through groove, the rectangular frame is fixed to the left side of the reaction chamber above the partition plate, an insertion hole is provided at the left end of the partition plate below the rectangular frame, a threaded groove is provided at the middle position of the left side of the lower end of the reaction chamber, a threaded hole is provided at the middle position of the left end of the bottom plate, the outer side of the lower end of the insertion rod is inserted into the inner side of the insertion hole, the outer side of the threaded rod is threadedly connected to the inner side of the threaded hole, and the outer side of the upper end of the threaded rod is threadedly connected to the inner side of the threaded groove. The lower side of the reaction chamber abuts against the upper side of the base plate. The lower right end of the reaction chamber is hinged to the right side of the base plate. After the desulfurization and denitrification catalyst in the reaction chamber becomes ineffective, the insert rod is pulled up to move to the insertion hole inside the left end of the partition plate. Then the partition plate is pulled to the left to pull it out of the through groove. Then the rotating handle is turned so that the threaded rod moves down while rotating in the threaded hole and threaded groove until the threaded rod moves down out of the threaded groove. Then the base plate can be rotated down and no longer contact the lower side of the reaction chamber. At this time, the ineffective desulfurization and denitrification catalyst in the reaction chamber will fall from between the exhaust pipe and the base plate.

[0015] A further improvement is that a rubber pad is fixedly connected to the upper edge of the base plate, so that the contact between the reaction chamber and the base plate can be kept sealed by the rubber pad on the upper side of the base plate contacting the lower side of the reaction chamber.

[0016] A further improvement is that a transparent observation window is installed at the front end of the reaction chamber, and the transparent observation window is a transparent glass plate, so that the staff can observe the working conditions inside the reaction chamber through the transparent observation window.

[0017] In summary, this application discloses a VOCs tail gas recovery device for tank farms.

[0018] In this technical solution, when the exhaust gas recovery and treatment device is working, the flue gas entering the bottom of the reaction chamber from the inlet pipe will drift to the right at the lower end of the partition plate inside the reaction chamber, then drift upward through the gap between the partition plate and the right side of the reaction chamber, and then drift to the left at the part above the partition plate inside the reaction chamber, and finally drift out from the exhaust pipe. This prevents the flue gas from drifting directly upward and then quickly drifting out of the exhaust pipe after entering the reaction chamber. Instead, it guides the flue gas to drift in a zigzag manner within the reaction chamber, thus allowing the flue gas to drift in the reaction chamber for a longer time. This allows for more thorough contact with the desulfurization and denitrification catalyst in the reaction chamber, improving the desulfurization and denitrification effect of the flue gas and reducing the harmful components in the flue gas generated by the heating furnace combustion to the emission standards.

[0019] Furthermore, while the flue gas is floating in the reaction chamber, the first and second motors are activated to drive the first and second rotating shafts to rotate. This causes the stirring blades outside the first and second rotating shafts to rotate, agitating the desulfurization and denitrification catalysts at both ends of the partition plate in the reaction chamber. This allows the flue gas to come into more thorough contact with the desulfurization and denitrification catalysts, resulting in more complete catalytic desulfurization and denitrification. At the same time, by agitating the desulfurization and denitrification catalysts, the catalysts in the reaction chamber are evenly contacted with the flue gas for catalytic catalysis. This prevents the desulfurization and denitrification catalysts from piling up, which would prevent the bottom desulfurization and denitrification catalysts from producing a catalytic effect and thus affect the catalytic work. This increases the utilization rate of the desulfurization and denitrification catalysts and reduces waste. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of the reaction chamber of this utility model;

[0022] Figure 3 This is a schematic diagram of the structure at the first and second rotating shafts of this utility model;

[0023] Figure 4 This is a schematic diagram of the rectangular frame structure of this utility model;

[0024] Figure 5 for Figure 2 Enlarged view of point A.

[0025] In the diagram: 1. Reaction chamber; 2. Support leg; 3. Air inlet pipe; 4. Exhaust pipe; 501. First motor; 502. First rotating shaft; 503. Second motor; 504. Second rotating shaft; 505. Stirring blade; 506. Base plate; 507. Divider plate; 601. Rectangular frame; 602. Spring; 603. Annular plate; 604. Insert rod; 605. Threaded rod; 606. Rotating handle; 7. Transparent observation window. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figures 1-5This utility model provides a technical solution: a VOCs tail gas recovery device for tank farms, including a reaction box 1 and a support leg 2. The support leg 2 is fixedly connected to the front and rear ends of the left and right sides of the reaction box 1. An air inlet pipe 3 is fixedly connected to the lower left end of the reaction box 1. An exhaust pipe 4 is fixedly connected to the upper left side of the reaction box 1. Purification mechanisms are provided at the inner and outer ends of the reaction box 1.

[0028] The purification mechanism includes a first motor 501 installed at the upper and lower ends of the left front of the reaction chamber 1. A first rotating shaft 502 is fixedly connected to the right end of the output shaft of the first motor 501. A second motor 503 is installed at the upper and lower ends of the left rear of the reaction chamber 1. A second rotating shaft 504 is fixedly connected to the right end of the output shaft of the second motor 503. Stirring blades 505 are fixedly connected to the outer sides of the first rotating shaft 502 and the second rotating shaft 504. A base plate 506 is connected to the lower end of the reaction chamber 1. A partition plate 507 is connected to the middle of the interior of the reaction chamber 1. The left end of the partition plate 507 is located in the middle of the left interior of the reaction chamber 1, and there is a gap between the right end of the partition plate 507 and the right inner side of the reaction chamber 1. The interior of chamber 1 contains a desulfurization and denitrification catalyst. This causes the flue gas entering the bottom of chamber 1 from the inlet pipe 3 to drift to the right at the lower end of the partition plate 507 inside chamber 1, then drift upward through the gap between the partition plate 507 and the right side of the inside of chamber 1, and then drift to the left at the part above the partition plate 507 inside chamber 1, before finally drifting out from the exhaust pipe 4. This prevents the flue gas from drifting directly upward and quickly exiting from the exhaust pipe 4 after entering chamber 1, but instead causes it to drift back and forth within chamber 1. This allows the flue gas to drift within chamber 1 for a longer period, enabling it to come into more thorough contact with the desulfurization and denitrification catalyst in chamber 1, thus improving the desulfurization and denitrification effect on the flue gas.

[0029] The stirring blades 505 on the outer side of the first rotating shaft 502 and the stirring blades 505 on the outer side of the second rotating shaft 504 are fixed in an alternating discharge manner. While the flue gas is floating in the reaction chamber 1, the first motor 501 and the second motor 503 are started to drive the first rotating shaft 502 and the second rotating shaft 504 to rotate. This causes the stirring blades 505 on the outer side of the first rotating shaft 502 and the second rotating shaft 504 to rotate, which agitates the desulfurization and denitrification catalysts at both ends of the partition plate 507 in the reaction chamber 1. This allows the flue gas to come into more full contact with the desulfurization and denitrification catalysts, and thus to be more fully catalyzed for desulfurization and denitrification. At the same time, by agitating the desulfurization and denitrification catalysts, the desulfurization and denitrification catalysts in the reaction chamber 1 are evenly contacted with the flue gas for catalysis. This avoids the accumulation of desulfurization and denitrification catalysts, which would prevent the desulfurization and denitrification catalysts at the bottom from failing to produce catalytic effects and thus affect the catalytic work. This results in a higher utilization rate of the desulfurization and denitrification catalysts and reduces the waste of desulfurization and denitrification catalysts.

[0030] The outer end of the reaction chamber 1 is provided with a disassembly unit, which includes a rectangular frame 601 fixedly connected to the left side of the reaction chamber 1. A spring 602 is fixedly connected to the middle position of the top of the inner side of the rectangular frame 601. An annular plate 603 is fixedly connected to the lower end of the spring 602. An insertion rod 604 is fixedly connected to the inner side of the annular plate 603. A circular hole is opened at the middle position of the upper and lower ends inside the rectangular frame 601. The outer side of the insertion rod 604 is slidably connected to the inner side of the circular hole. Thus, when the spring 602 moves and drives the annular plate 603 to move, the insertion rod 604 can be driven to slide along the inner side of the circular hole, thereby limiting the movement of the insertion rod 604.

[0031] A threaded rod 605 is connected to the middle of the left end of the base plate 506. A rotating handle 606 is welded to the lower end of the threaded rod 605. A through groove is opened at the middle of the left end of the reaction chamber 1. The outer side of the partition plate 507 is slidably connected to the inner side of the through groove. A rectangular frame 601 is fixed to the left side of the reaction chamber 1 above the partition plate 507. An insertion hole is opened at the left end of the partition plate 507 below the rectangular frame 601. A threaded groove is opened at the middle of the left side of the lower end of the reaction chamber 1. A threaded hole is opened at the middle of the left end of the base plate 506. The outer side of the lower end of the insertion rod 604 is inserted into the inner side of the insertion hole. The outer side of the threaded rod 605 is threaded to the inner side of the threaded hole. The outer side of the upper end of the threaded rod 605 is threaded to the inner side of the threaded groove. The lower side of the reaction chamber 1 is connected to the upper side of the base plate 506. The reaction chamber 1 is hinged to the right side of the bottom plate 506 via a hinge. After the desulfurization and denitrification catalyst in the reaction chamber 1 becomes ineffective, the following steps are taken: first, pull up the insert rod 604 to move it to the insertion hole inside the left end of the partition plate 507; then, pull the partition plate 507 to the left to pull it out of the through groove; then, rotate the handle 606 to move the threaded rod 605 down while it is rotating in the threaded hole and threaded groove until the threaded rod 605 moves out of the threaded groove; then, rotate the bottom plate 506 downwards so that it no longer contacts the lower side of the reaction chamber 1. At this time, the ineffective desulfurization and denitrification catalyst in the reaction chamber 1 will fall from between the exhaust pipe 4 and the bottom plate 506 and be collected as it falls, thus completing the rapid cleaning of the ineffective desulfurization and denitrification catalyst in the reaction chamber 1.

[0032] A rubber pad is fixedly connected to the upper edge of the base plate 506. When the base plate 506 is fixed to the lower side of the reaction chamber 1, the rubber pad on the upper side of the base plate 506 contacts the lower side of the reaction chamber 1, which can keep the contact between the reaction chamber 1 and the base plate 506 sealed and prevent gaps from causing the desulfurization and denitrification catalyst in the reaction chamber 1 to flow out.

[0033] A transparent observation window 7 is installed at the front end of the reaction chamber 1. The transparent observation window 7 is a transparent glass plate, which allows the staff to observe the working conditions inside the reaction chamber 1 through the transparent observation window 7, so that they can stop the work in time for maintenance when a fault occurs in the reaction chamber 1.

[0034] Working principle: When treating the flue gas after combustion in the heating furnace, the first motor 501 and the second motor 503 are started first, driving the first rotating shaft 502 and the second rotating shaft 504 to rotate, which in turn drives the stirring blade 505 to rotate, continuously agitating the desulfurization and denitrification catalyst in the reaction chamber 1. Then, the flue gas is introduced into the bottom of the reaction chamber 1 through the inlet pipe 3. The flue gas will then drift to the right at the lower part of the partition plate 507 inside the reaction chamber 1, and then drift upward through the gap between the partition plate 507 and the right side of the inside of the reaction chamber 1. The portion located above the partition plate 507 inside the reaction chamber 1 drifts to the left and finally exits from the exhaust pipe 4. During its drifting within the reaction chamber 1, it fully contacts the desulfurization and denitrification catalyst for desulfurization and denitrification. By guiding the flue gas to drift in a zigzag manner within the reaction chamber 1, the flue gas spends a longer time drifting within the reaction chamber 1, allowing for more thorough contact with the desulfurization and denitrification catalyst in the reaction chamber 1. This improves the desulfurization and denitrification effect on the flue gas, resulting in a reduction of sulfur and other harmful components in the emitted flue gas to the emission standard.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A VOCs tail gas recovery device for tank farms, comprising a reaction tank (1) and support legs (2), wherein the support legs (2) are fixedly connected to the front and rear ends of the left and right sides below the reaction tank (1), characterized in that: An air inlet pipe (3) is fixedly connected to the lower left end of the reaction chamber (1), and an exhaust pipe (4) is fixedly connected to the upper left side of the reaction chamber (1). Purification mechanisms are provided at both the inner and outer ends of the reaction chamber (1). The purification mechanism includes a first motor (501) installed at the upper and lower ends of the left front of the reaction chamber (1). The output shaft of the first motor (501) is fixedly connected to the right end of a first rotating shaft (502). A second motor (503) is installed at the upper and lower ends of the left rear of the reaction chamber (1). The output shaft of the second motor (503) is fixedly connected to the right end of a second rotating shaft (504). A stirring blade (505) is fixedly connected to the outer side of the first rotating shaft (502) and the second rotating shaft (504). A base plate (506) is connected to the lower end of the reaction chamber (1). A partition plate (507) is connected to the middle position inside the reaction chamber (1). A disassembly unit is provided at the outer end of the reaction chamber (1).

2. The VOCs tail gas recovery device for tank farms according to claim 1, characterized in that: The disassembly and assembly unit includes a rectangular frame (601) fixedly connected to the left side of the reaction chamber (1). A spring (602) is fixedly connected to the middle position of the top of the inner side of the rectangular frame (601). An annular plate (603) is fixedly connected to the lower end of the spring (602). A plug rod (604) is fixedly connected to the inner side of the annular plate (603). A threaded rod (605) is connected to the middle position of the left end inside the base plate (506). A rotating handle (606) is welded to the lower end of the threaded rod (605).

3. The VOCs tail gas recovery device for tank farms according to claim 1, characterized in that: The left end of the partition plate (507) is located in the middle of the left end of the reaction tank (1), and there is a gap between the right end of the partition plate (507) and the right end of the inner side of the reaction tank (1). The inside of the reaction tank (1) is filled with desulfurization and denitrification catalyst.

4. The VOCs tail gas recovery device for tank farms according to claim 1, characterized in that: The stirring blades (505) on the outer side of the first rotating shaft (502) and the stirring blades (505) on the outer side of the second rotating shaft (504) are fixed in an alternating discharge manner.

5. A VOCs tail gas recovery device for tank farms according to claim 2, characterized in that: A circular hole is provided at the middle position of the upper and lower ends inside the rectangular frame (601), and the outer side of the insertion rod (604) is slidably connected to the inner side of the circular hole.

6. A VOCs tail gas recovery device for tank farms according to claim 2, characterized in that: A through groove is provided at the middle position of the left end of the reaction box (1). The outer side of the partition plate (507) is slidably connected to the inner side of the through groove. The rectangular frame (601) is fixed to the left side of the reaction box (1) above the partition plate (507). An insertion hole is provided at the left end of the partition plate (507) below the rectangular frame (601). A threaded groove is provided at the middle position of the left side of the lower end of the reaction box (1). A threaded hole is provided at the middle position of the left end of the bottom plate (506). The outer side of the lower end of the insertion rod (604) is inserted into the inner side of the insertion hole. The outer side of the threaded rod (605) is threadedly connected to the inner side of the threaded hole. The outer side of the upper end of the threaded rod (605) is threadedly connected to the inner side of the threaded groove. The lower side of the reaction box (1) abuts against the upper side of the bottom plate (506). The lower right side of the reaction box (1) is hinged to the right side of the bottom plate (506) by a hinge.

7. A VOCs tail gas recovery device for tank farms according to claim 1, characterized in that: A rubber pad is fixedly connected to the upper edge of the base plate (506).

8. A VOCs tail gas recovery device for tank farms according to claim 1, characterized in that: The front end of the reaction chamber (1) is equipped with a transparent observation window (7), and the transparent observation window (7) is a transparent glass plate.

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