Deep purification system for waste gas containing tobacco shred particles in rolling and packaging dust removal room

Abstract

The utility model provides a deep purification system for waste gas containing tobacco shred particles in a rolling and packaging dust removal room, which comprises a cyclone dust collector, a first centrifugal purification device and a second centrifugal purification device which are used for purifying the waste gas step by step, each of the first centrifugal purification device and the second centrifugal purification device comprises a water throwing nozzle for atomizing a liquid medium and a centrifugal impeller for gas-liquid separation, and the first centrifugal purification device is used for mixing waste gas with the atomized water medium and then performing gas-liquid separation to remove particles; and the second centrifugal purification device is used for mixing the waste gas with the atomized odor removal medium and then carrying out gas-liquid separation to remove odor. By means of the cyclone dust collector, the first centrifugal purification device and the second centrifugal purification device which are used for purifying waste gas step by step, step-by-step purification of particulate matter / dust and peculiar smell molecular substances in the waste gas is achieved, the waste gas can be efficiently purified, peculiar smell removing media can be saved, and the separated substances can be effectively classified and recycled.

Description

Technical Field

[0001] This utility model relates to a waste gas treatment system, specifically, to a deep purification system for waste gas containing tobacco particles in a package dust collection room. Background Technology

[0002] In the cigarette manufacturing process, the main function of the dust removal room is to collect and process the dust and tobacco debris generated during production. Therefore, the exhaust gas from the cigarette packaging dust removal room generally contains tobacco particles, dust, and odor molecules. If the exhaust gas is discharged directly, it will not meet the relevant regulations and needs to be purified to a certain standard before it can be discharged.

[0003] In existing technologies, such as the method for treating waste gas in tobacco production disclosed in Chinese invention patent CN201310014071.2, the waste gas generated during the cigarette packaging dust removal process is collected into a waste gas collection pipe, and then passed through a first-stage high-efficiency cross-flow scrubbing tank. The scrubbing tank mainly removes particulate matter, dust, and water-soluble ammonia, organic acids, and water-soluble odor molecules from the waste gas. After treatment by the first-stage high-efficiency cross-flow scrubbing tank, the odor molecules and particulate matter in the waste gas are basically removed. In the specific solution, the scrubbing tank includes a cross-flow waste gas treatment system, which consists of polypropylene multi-faceted hollow spheres filled in the purification cavity. The system comprises a front spray system and an upper spray system for spraying and purifying liquid onto the polypropylene multifaceted hollow sphere packing. The front spray system is located in front of the polypropylene multifaceted hollow sphere packing, and the upper spray system is located above the polypropylene multifaceted hollow sphere packing. A water tank is located below the packing. A gas-liquid separation device is located behind the polypropylene multifaceted hollow sphere packing. The waste gas also needs to be treated by the gas-liquid separation device. The gas-liquid separation device consists of several inclined corrugated baffles. When the waste gas flows through the gas-liquid separator, the liquid droplets entrained in the gas flow settle in the curved channel of the baffle under the action of inertial force. The liquid film formed flows down the plate surface to the water tank by gravity, and then the waste gas is discharged after meeting the standards.

[0004] The aforementioned public documents describe a process where the exhaust gas from a roll-to-roll dust collector is passed through a "first-stage high-efficiency cross-flow scrubbing tank device." The spray system directly targets all particulate matter, dust, and odor molecules in the exhaust gas. Particulate matter and dust preferentially bind to the liquid medium used for odor removal. In particular, large particles and dust severely affect the binding of the liquid medium to odor molecules, resulting in excessive spraying of the liquid medium to achieve the odor removal effect. This not only wastes the medium but also makes it difficult to achieve the desired odor removal effect. Furthermore, it fails to achieve the classification and recycling of separated substances (such as solid particulate dust, waste residue, and waste liquid).

[0005] In order to solve the above problems, people have been seeking an ideal technological solution. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a deep purification system for exhaust gas containing tobacco particles in a packaged dust collector. This system achieves step-by-step purification of particulate matter / dust and odor molecules in the exhaust gas, efficiently purifying the exhaust gas, saving on odor removal media, and effectively classifying and recycling the separated substances.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: it includes a cyclone dust collector for purifying waste gas in stages, a first centrifugal purification device, and a second centrifugal purification device. Both the first centrifugal purification device and the second centrifugal purification device include a water-spraying nozzle for atomizing liquid medium and a centrifugal impeller for gas-liquid separation. The first centrifugal purification device is used to mix the waste gas with the atomized water medium and then perform gas-liquid separation to remove particles. The second centrifugal purification device is used to mix the waste gas with the atomized odor-removing medium and then perform gas-liquid separation to remove odors.

[0008] Based on the above, the air outlet of a single cyclone dust collector is connected to the air inlet of a single first centrifugal purification device, and the air outlets of multiple first centrifugal purification devices are collectively connected to the air inlet of a single second centrifugal purification device.

[0009] Based on the above, the first centrifugal purification device is provided with a first atomizing chamber connected to its air inlet, the first atomizing chamber is connected to a second atomizing chamber, both the first atomizing chamber and the second atomizing chamber are provided with the water-spraying nozzle, and a centrifugal impeller is provided above the water-spraying nozzle in the second atomizing chamber.

[0010] Based on the above, the second centrifugal purification device is provided with a third atomizing chamber connected to its air inlet. The third atomizing chamber is provided with a plurality of water-spraying nozzles, and each water-spraying nozzle is provided with a centrifugal impeller above it.

[0011] Based on the above, a clean air pipe is provided between the air outlet of the first centrifugal purification device and the air inlet of the second centrifugal purification device, and multiple first centrifugal purification devices are connected to the clean air pipe one by one.

[0012] Based on the above, the air outlet of the first centrifugal purification device is connected to a first exhaust fan, and the air outlet of the first exhaust fan is connected to the clean air duct.

[0013] Based on the above, the clean air duct is equipped with an air volume balancing valve, which is used to compensate for the air volume output of the first centrifugal purification device.

[0014] Based on the above, the outlet of the second centrifugal purification device is equipped with a second induced draft fan for discharging the purified gas.

[0015] Based on the above, the air inlet of one of the cyclone dust collectors is connected to a cyclone material recovery pipe, and the ash discharge valves of the other cyclone dust collectors are connected to the cyclone material recovery pipe one by one.

[0016] Based on the above, an explosion-proof valve is provided on the cyclone material recovery pipe between the air inlet of the cyclone dust collector and the ash discharge valve.

[0017] This utility model has substantial features and advancements compared to existing technologies. Specifically, by using a cyclone dust collector, a first centrifugal purification device, and a second centrifugal purification device to purify waste gas in stages, the particulate matter / dust and odor molecules in the waste gas are purified step by step. The cyclone dust collector can initially separate particulate matter and dust, the first centrifugal purification device can further separate the remaining particulate matter and dust, and the second centrifugal purification device can separate odor molecules. This allows for the effective classification and recycling of the separated substances, which can efficiently purify waste gas and save on odor removal media.

[0018] Simultaneously, the outlet of a single cyclone dust collector connects to the inlet of a single first centrifugal purification device to form a set of particle removal modules. Multiple sets of particle removal modules are connected in parallel to a second centrifugal purification device. The first centrifugal purification device uses a first atomizing chamber and a second atomizing chamber connected in series, allowing particulate matter and dust to be fully mixed with water mist. The second centrifugal purification device uses multiple centrifugal impellers connected in parallel to a third atomizing chamber, allowing odor molecules to be fully mixed with the atomized odor-removing medium, thus achieving thorough and efficient purification of exhaust gas. In addition, the cyclone material recovery pipe prevents gas from escaping during ash discharge from the cyclone dust collector, thus avoiding environmental pollution. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 yes Figure 1 Another structural diagram;

[0021] Figure 3 yes Figure 1 Another structural diagram;

[0022] Figure 4 This is a three-dimensional perspective schematic diagram of the structure of the first centrifugal purification device;

[0023] Figure 5 yes Figure 4 sectional view along line AA;

[0024] Figure 6 This is a top view of the structure of the second centrifugal purification device;

[0025] Figure 7 yes Figure 6 Cross-sectional view along line BB;

[0026] In the figure, the reference numerals are as follows: first centrifugal purification device 1, first atomizing chamber 11, second atomizing chamber 12, first induced draft fan 13, second centrifugal purification device 2, third atomizing chamber 21, second induced draft fan 22, cyclone dust collector 3, cyclone material recovery pipe 31, ash discharge valve 32, explosion-proof valve 33, water jet nozzle 4, centrifugal impeller 5, and clean air pipe 6. Detailed Implementation

[0027] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0028] Example 1

[0029] like Figures 1-7 As shown, the deep purification system for flue gas containing tobacco particles in the dust collection room of this application includes a cyclone dust collector 3, a first centrifugal purification device 1, and a second centrifugal purification device 2 used for purifying the flue gas in stages: First, after the flue gas passes through the cyclone dust collector 3, large particles and dust are separated out by the cyclone dust collector 3, forming solid powder and being effectively recovered. Second, after the flue gas passes through the first centrifugal purification device 1, the remaining particles and dust are separated out by the first centrifugal purification device 1, forming waste residue and being effectively recovered. Finally, after the flue gas passes through the second centrifugal purification device 2, odor molecules in the flue gas are separated out by the second centrifugal purification device 2, forming waste liquid and being effectively recovered. The flue gas after the above three-stage purification can meet the emission standards.

[0030] Specifically, both the first centrifugal purification device 1 and the second centrifugal purification device 2 include a water-spraying nozzle 4 for atomizing liquid media and a centrifugal impeller 5 for gas-liquid separation. The applicant's earlier patents CN202223502282.4 (water centrifugal atomizing jet) and CN202223502291.3 (water-spraying impeller for gas-mist separation) have disclosed the relevant structures of the water-spraying nozzle 4 and the centrifugal impeller 5, respectively. CN202223502360.0 (exhaust gas purification device for shredder) has disclosed the structure of the combination of the two. The water-spinning nozzle 4 has a hollow inverted conical shell. The shell is equipped with a water outlet and serrated atomizing blades. Through continuous high-speed rotation, the water-spinning nozzle 4 throws the liquid entering its shell out through the water outlet and is dispersed into a mist by the serrated atomizing blades. This mist can fully mix particulate matter / dust or odor molecules in the exhaust gas. Larger water droplets and heavier mixtures fall, while the exhaust gas and lighter mixtures enter the centrifugal impeller 5. The centrifugal impeller 5 includes an upper plate, a lower plate, and a water-spinning blade between them. After the exhaust gas enters the space between the upper and lower plates from below the high-speed rotating centrifugal impeller 5, the exhaust gas flow is accelerated by the water-spinning blades. Lighter mixtures are thrown to the outside, and the gas rises through the upper plate due to airflow pressure, achieving gas-liquid separation. When the two are used together, the water-splashing nozzle 4 is located below the centrifugal impeller 5 and the two are coaxially arranged. They share a common drive motor, and the gas passes through the water-splashing nozzle 4 and the centrifugal impeller 5 from bottom to top.

[0031] In this application, the centrifugal impellers 5 can be used in pairs to form a set, and the two together can perform gas-liquid separation. That is, the waste gas passes through two centrifugal impellers 5 one after the other to maximize the gas-liquid separation of the waste gas and reduce the amount of water escape.

[0032] The first centrifugal purification device 1 is used to mix the exhaust gas with atomized water medium and then perform gas-liquid separation to remove particles. The atomized water medium mixes with the particulate matter and dust in the exhaust gas. Larger water droplets and heavier mixtures fall directly and are separated, while lighter mixtures enter the centrifugal impeller 5 and are separated. The mixtures separated in the above two steps form waste residue, which is collected by the waste residue collection pipeline and sent to the solid-liquid separation device for further processing. The exhaust gas from which the particulate matter and dust have been separated then enters the second centrifugal purification device 2.

[0033] The second centrifugal purification device 2 is used to mix the exhaust gas with the atomized odor-removing medium and then separate the gas and liquid to remove odors. The atomized odor-removing medium mixes with the odor molecules in the exhaust gas. Some of the odor molecules are mixed with heavier water droplets and fall directly to be separated. The other part of the odor molecules form a mixture of water mist and gas and enters the centrifugal impeller 5 for separation. The waste liquid separated in the above two steps can be reused or further processed.

[0034] In this embodiment, the cyclone dust collector 3, the first centrifugal purification device 1, and the second centrifugal purification device 2 are used to purify the exhaust gas in stages, thereby achieving the step-by-step purification of particulate matter / dust and odor molecules in the exhaust gas. Particulate matter and dust can be initially separated by the cyclone dust collector 3, the remaining particulate matter and dust can be further separated by the first centrifugal purification device 1, and odor molecules can be separated by the second centrifugal purification device 2. This enables the effective classification and recycling of the separated substances, which can efficiently purify the exhaust gas and save on odor removal media.

[0035] Example 2

[0036] Based on Embodiment 1, the air outlet of a single cyclone dust collector 3 is connected to the air inlet of a single first centrifugal purification device 1, and the two form a set of particle removal modules; the air outlets of multiple first centrifugal purification devices 1 are connected to the air inlet of a single second centrifugal purification device 2, and the single second centrifugal purification device 2 forms an odor removal module.

[0037] The first centrifugal purification device 1 mainly treats particulate matter and dust in the exhaust gas. However, the content of particulate matter / dust in the exhaust gas is relatively high. The limit on the exhaust gas treatment capacity for high particulate matter / dust content is mainly due to the fact that the atomized water medium provided by the water-splashing nozzle 4 cannot fully mix the particulate matter / dust. Since the water mist formed by a single water-splashing nozzle 4 is limited and the gas throughput of the centrifugal impeller 5 is also limited, it is necessary to appropriately reduce the exhaust gas throughput of the first centrifugal purification device 1 to achieve an effective purification effect. Since the water-splashing nozzle 4 needs to function in a separate space, multiple parallel particulate removal modules are used to disperse and purify the exhaust gas, which can efficiently treat particulate matter / dust in large-volume exhaust gas and prevent the rated exhaust gas treatment capacity of a single particulate removal module from being exceeded.

[0038] The second centrifugal purification device 2 mainly treats odor molecules in the exhaust gas. Since the particulate matter and dust in the exhaust gas have been effectively separated, the content of odor molecules is relatively low. The limit of the exhaust gas treatment capacity of the second centrifugal purification device 2 is mainly determined by the gas throughput of the centrifugal impeller 5. Multiple centrifugal impellers 5 can be connected in parallel above an atomizing chamber (the atomizing chamber is the cavity in which the water spray nozzle 4 sprays the atomizing medium). Therefore, the odor removal module formed by a single second centrifugal purification device 2 can effectively treat odor molecules in a large flow of exhaust gas.

[0039] Based on the above, a clean air pipe 6 is provided between the air outlet of the first centrifugal purification device 1 and the air inlet of the second centrifugal purification device 2, and multiple first centrifugal purification devices 1 are connected to the clean air pipe 6 one by one; specifically, the air outlet of each first centrifugal purification device 1 is connected to a first exhaust fan 13, and the air outlet of each first exhaust fan 13 is connected to the clean air pipe 6 one by one. In addition, an air volume balancing valve 61 is provided on the clean air pipe 6, which is used to compensate for the air volume of the first centrifugal purification device 1 and prevent pressure imbalance between the first centrifugal purification device 1 and the second centrifugal purification device 2.

[0040] Based on the above, the outlet of the second centrifugal purification device 2 is equipped with a second induced draft fan 22 for discharging the purified gas.

[0041] Example 3

[0042] Based on Embodiment 1 or Embodiment 2, the first centrifugal purification device 1 is provided with a first atomizing chamber 11 connected to its air inlet. The first atomizing chamber 11 is connected to a second atomizing chamber 12. Both the first atomizing chamber 11 and the second atomizing chamber 12 are provided with water-splashing nozzles 4. A centrifugal impeller 5 is provided above the water-splashing nozzles 4 in the second atomizing chamber 12. The water-splashing nozzles 4 in the first atomizing chamber 11 can use a single drive motor, while the water-splashing nozzles 4 and the centrifugal impeller 5 in the second atomizing chamber 12 can share a single drive motor on the same axis.

[0043] The first centrifugal purification device 1 employs water-spraying nozzles 4 connected in series. The water-spraying nozzles 4 in the first atomizing chamber 11 are mainly used to separate larger particles and dust after passing through the cyclone dust collector 3, allowing the larger particles / dust to combine with water mist and fall off for separation. The water-spraying nozzles 4 in the second atomizing chamber 12 mainly separate the remaining particles / dust, allowing the remaining particles / dust to be fully mixed with water mist in the second atomizing chamber 12. This reduces the amount of particles / dust escaping, and allows the water-spraying nozzles 4 in the first centrifugal purification device 1 to fully mix the high concentration of particles / dust with water mist.

[0044] The second centrifugal purification device 2 has a third atomizing chamber 21 connected to its air inlet. The third atomizing chamber 21 contains multiple water-spraying nozzles 4, each with a centrifugal impeller 5 above it. Because the gas throughput of the centrifugal impeller 5 is limited, the scheme of multiple sets of centrifugal impellers 5 connected in parallel to the third atomizing chamber 21 can handle odor molecules in large volumes of exhaust gas. The multiple water-spraying nozzles 4 distributed within the third atomizing chamber 21 ensure thorough mixing of the odor-removing medium with the exhaust gas; for example... Figure 6 , Figure 7As shown, the third atomizing chamber 21 is equipped with four water-splashing nozzles 4 and four sets of centrifugal impellers 5 (each set of centrifugal impellers 5 is used in pairs). One water-splashing nozzle 4 and one set of centrifugal impellers 5 can share a drive motor on the same axis, so that the centrifugal impellers 5 in the second centrifugal purification device 2 can perform gas-liquid separation on large flow of waste gas.

[0045] In this embodiment, the first centrifugal purification device 1 uses a first atomizing chamber 11 and a second atomizing chamber 12 connected in series to fully mix particulate matter and dust with water mist; the second centrifugal purification device 2 uses multiple centrifugal impellers 5 connected in parallel to the third atomizing chamber 21 to fully mix odor molecules with the atomized odor-removing medium.

[0046] Example 4

[0047] Based on Embodiment 2, the inlet of one cyclone dust collector 3 is connected to a cyclone material recovery pipe 31. The ash discharge valves 32 of the other cyclone dust collectors 3 are connected to the cyclone material recovery pipe 31 one by one. This allows the particulate matter and dust initially separated in the other cyclone dust collectors 3 to be collected and then re-enter a cyclone dust collector 3 for further separation. This maximizes the recovery of gas from the ash discharge valves 32 of the cyclone dust collectors 3, preventing gas from escaping during ash discharge and causing environmental pollution. An explosion-proof valve 33 is installed on the cyclone material recovery pipe 31 between the inlet of the cyclone dust collector 3 and the ash discharge valve 32 to prevent pressure imbalance within the cyclone material recovery pipe 31. After ash is discharged from its own ash discharge valve 32, the cyclone dust collector 3 with its inlet connected to the cyclone material recovery pipe 31 can be processed by a pressure bar.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A deep purification system for exhaust gas containing tobacco particles in a packaged dust collector, characterized in that, It includes a cyclone dust collector (3) for purifying exhaust gas in stages, a first centrifugal purification device (1) and a second centrifugal purification device (2). Both the first centrifugal purification device (1) and the second centrifugal purification device (2) include a water spray nozzle (4) for atomizing liquid medium and a centrifugal impeller (5) for gas-liquid separation. The first centrifugal purification device (1) is used to mix exhaust gas with atomized water medium and then separate the gas and liquid to remove particles. The second centrifugal purification device (2) is used to mix exhaust gas with atomized odor-removing medium and then separate the gas and liquid to remove odor.

2. The deep purification system for exhaust gas containing tobacco particles in the roll-and-package dust collector according to claim 1, characterized in that, The outlet of a single cyclone dust collector (3) is connected to the inlet of a single first centrifugal purification device (1), and the outlets of multiple first centrifugal purification devices (1) are connected to the inlet of a single second centrifugal purification device (2).

3. The deep purification system for flue gas containing tobacco particles in a package dust collector according to claim 1 or 2, characterized in that, The first centrifugal purification device (1) is provided with a first atomizing chamber (11) connected to its air inlet. The first atomizing chamber (11) is connected to a second atomizing chamber (12). The first atomizing chamber (11) and the second atomizing chamber (12) are both provided with the water-spinning nozzle (4). A centrifugal impeller (5) is provided above the water-spinning nozzle (4) in the second atomizing chamber (12).

4. The deep purification system for flue gas containing tobacco particles in a package dust collector according to claim 1 or 2, characterized in that, The second centrifugal purification device (2) is provided with a third atomizing chamber (21) connected to its air inlet. The third atomizing chamber (21) is provided with a plurality of water-spraying nozzles (4), and each water-spraying nozzle (4) is provided with a centrifugal impeller (5) above it.

5. The deep purification system for exhaust gas containing tobacco particles in a package dust collector according to claim 2, characterized in that, A clean air pipe (6) is provided between the air outlet of the first centrifugal purification device (1) and the air inlet of the second centrifugal purification device (2), and multiple first centrifugal purification devices (1) are connected to the clean air pipe (6) one by one.

6. The deep purification system for exhaust gas containing tobacco particles in a package dust collector according to claim 5, characterized in that, The air outlet of the first centrifugal purification device (1) is connected to the first exhaust fan (13), and the air outlet of the first exhaust fan (13) is connected to the clean air pipe (6).

7. The deep purification system for flue gas containing tobacco particles in a package dust collector according to claim 5 or 6, characterized in that, The clean air duct (6) is equipped with an air volume balancing valve, which is used to compensate for the air volume of the first centrifugal purification device (1).

8. The deep purification system for flue gas containing tobacco particles in a package dust collector according to claim 1 or 2, characterized in that, The outlet of the second centrifugal purification device (2) is equipped with a second induced draft fan (22) for discharging the purified gas.

9. The deep purification system for exhaust gas containing tobacco particles in a package dust collector according to claim 2, characterized in that, One of the cyclone dust collectors (3) has its air inlet connected to a cyclone material recovery pipe (31), and the ash discharge valves (32) of the other cyclone dust collectors (3) are connected to the cyclone material recovery pipe (31) one by one.

10. The deep purification system for exhaust gas containing tobacco particles in a package dust collector according to claim 9, characterized in that, An explosion-proof valve (33) is provided on the cyclone material recovery pipe (31) between the air inlet of the cyclone dust collector (3) and the ash discharge valve (32).

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