Dry ice puffing line hot end and fire danger control device

Abstract

The utility model discloses a dry ice puffing line hot end and fire danger control device which comprises a carbon dioxide high-pressure tank, a main pipe, a first branch pipe and a first electric valve, the first electric valve is arranged on the main pipe, the main pipe is communicated with the output end of the carbon dioxide high-pressure tank, and one end of the first branch pipe is communicated with the output end of the main pipe; and the other end is communicated with the access door at the hot end of the dry ice bulking line. According to the fire danger control device, the carbon dioxide fire extinguishing pipeline is arranged at the hot end of the dry ice bulking line, when an abnormal alarm occurs at the hot end, carbon dioxide can be introduced into the access door at the hot end through the main pipe and the first branch pipe by opening the first electric valve, and fire is extinguished through the carbon dioxide fire extinguishing effect and the partial cooling effect.

Description

Technical Field

[0001] The present application relates to the technical field of hot-end equipment for dry ice puffing lines, and particularly to a hot-end and fire risk control device for a dry ice puffing line. Background Art

[0002] The hot-end equipment of a dry ice expanded tobacco production line is used for the transportation, constant flow control, expansion, cooling of dry ice tobacco and expanded tobacco, and providing heat energy for process gas. The dry ice tobacco impregnated with liquid CO2 is evenly fed into a sublimator by a constant flow device. The dry ice tobacco contacts with high-temperature process gas in the sublimator, and the temperature rapidly increases. Under the state of high temperature difference, the dry ice rapidly sublimes, the moisture rapidly evaporates, and the tobacco is expanded. The expanded tobacco reaches the moisture content (12% ± 0.5) required by the process after being rehumidified, the expansion rate can reach 100%, and the content of harmful substances such as tar in the tobacco is greatly reduced. Adding an appropriate amount of expanded tobacco to cigarettes can not only reduce the single-box consumption of cigarette tobacco, but also improve the quality of cigarettes.

[0003] In a dry ice expanded tobacco production line, there will be sparking tobacco or even fire at the outlet of the discharge air lock; a large amount of carbonized tobacco is discharged from the dust outlet of the double-connected dust collector, and it will burn when contacting with air. The ignition of tobacco or dust is caused by its carbonization due to too long residence time in pipelines, double-connected dust collectors or tangential separators, and then contacting with air after carbonization. At present, a flushing fire extinguishing device is set at each of the above-mentioned fire-risk prone parts of the dry ice expanded tobacco production line, but there is a problem of poor fire extinguishing effect; on the one hand, there is only one water inlet at each place, the flushing range is limited, and when the water valve of the fire extinguishing device of the tangential separator is opened, after the water flows out from each fire-risk prone part, it is necessary to disassemble the inspection door at the corresponding position to remove the blockage, and when the door is opened, the internally smoldering tobacco may cause an open fire when encountering oxygen; on the other hand, the moisture content of the expanded tobacco is relatively low (less than 5%), and after the water valve is opened, the expanded tobacco will absorb a large amount of moisture, blocking the entire process path, which is not conducive to flushing and extinguishing fires; and after the equipment catches fire internally, the temperature is very high, and flushing and extinguishing with cold water will cause the equipment to suddenly contract, and excessive deformation may cause the equipment to crack and be damaged. Summary of the Utility Model

[0004] The present utility model provides a hot-end and fire risk control device for a dry ice puffing line to solve the technical problem of poor fire extinguishing effect of the existing flushing fire extinguishing device.

[0005] To achieve the above object, the technical solution provided by the present utility model is as follows:

[0006] In the first aspect of the present utility model, a fire risk control device for the hot end of a dry ice puffing line is provided, which includes a carbon dioxide high-pressure tank, a main pipe, a first branch pipe and a first electric valve. The first electric valve is arranged on the main pipe. The main pipe is communicated with the output end of the carbon dioxide high-pressure tank. One end of the first branch pipe is communicated with the output end of the main pipe, and the other end is communicated with the inspection door of the hot end of the dry ice puffing line.

[0007] Further, the fire risk control device includes a second branch pipe. The number of the second branch pipes is multiple. One end of each second branch pipe is communicated with the output end of the main pipe. The cyclone separator, the cooling vibrating trough and the double-dust collector at the hot end of the dry ice puffing line are respectively communicated with one of the second branch pipes.

[0008] Further, the fire risk control device includes a plurality of second electric valves, and the second electric valves are respectively arranged on the second branch pipes.

[0009] Further, the fire risk control device further includes a control system, and the first electric valve is connected to the control system.

[0010] Further, the fire risk control device further includes an oxygen content detector, and the oxygen content detector is installed on the vertical pipeline between the double-dust collector communicating with the hot end of the dry ice puffing line and the main fan at the hot end of the dry ice puffing line.

[0011] Further, the oxygen content detector is connected to the control system to transmit signals to the control system.

[0012] Further, the fire risk control device further includes a temperature sensor, and the temperature sensors are respectively arranged on the double-dust collector.

[0013] Further, the temperature sensor is connected to the control system to transmit signals to the control system.

[0014] In the second aspect of the present utility model, a hot end of a dry ice puffing line is provided, which includes the above-mentioned fire risk control device.

[0015] The dry ice puffing line hot end fire risk control device provided by the present utility model is provided with a carbon dioxide fire extinguishing pipeline at the hot end of the dry ice puffing line. When an abnormal alarm occurs at the hot end, carbon dioxide can be introduced into the inspection door at the hot end through the main pipe and the first branch pipe by opening the first electric valve, and the fire can be extinguished by using the fire extinguishing effect and partial cooling effect of carbon dioxide. Carbon dioxide has high fluidity and can penetrate and cover all the cut tobacco in the process pipeline and cool it, so that the fire risk can be eliminated more thoroughly; carbon dioxide fire extinguishing is non-conductive, leaves no trace after use, and does not damage the protected object, which can effectively protect the expanded cut tobacco in the process pipeline and the environment of the production site; carbon dioxide has a cooling function and can evenly cool the fire risk part in time, which is convenient for the equipment to carry out the next step of maintenance or restoration in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic structural diagram of the layout of the fire risk water pipeline at the hot end of the dry ice puffing line in the embodiment of the present utility model;

[0018] Figure 2 It is a schematic structural diagram of the dry ice puffing line hot end fire risk control device in the embodiment of the present utility model.

[0019] Reference numerals:

[0020] 1. Carbon dioxide high-pressure tank; 2. Main pipe; 3. First branch pipe; 4. First electric valve; 5. Inspection door; 6. Second branch pipe; 7. Cyclone separator; 8. Cooling vibrating trough; 9. Double dust collector; 10. Second electric valve; 11. Third electric valve; 12. Fire extinguishing waterway; 13. Main fan; 14. Oxygen content detector; 15. Temperature sensor; 16. Discharge air lock; 17. Spark detector; 18. Feed air lock; 19. Manual valve; 20. Dust removal air lock. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In order to enable those skilled in the art to better understand the technical solutions in the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0022] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0023] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0024] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality of" and "several" is two or more, unless otherwise specifically defined.

[0025] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the implementable conditions of the present application. Therefore, they do not have technical substantial significance. Any modification of the structure, change of the ratio relationship, or adjustment of the size, without affecting the effects that the present application can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present application.

[0026] As Figure 2 shown, an embodiment of the present application provides a hot-end fire risk control device for a dry ice puffing line, including a carbon dioxide high-pressure tank 1, a main pipe 2, a first branch pipe 3, and a first electric valve 4. The first electric valve 4 is disposed on the main pipe 2. The main pipe 2 is communicated with the output end of the carbon dioxide high-pressure tank 1. One end of the first branch pipe 3 is communicated with the output end of the main pipe 2, and the other end is communicated with the inspection door 5 of the hot end of the dry ice puffing line.

[0027] At the hot end of the dry ice puffing line, local blockage of the equipment below the discharge air lock 16 causes the separated cut tobacco to be unable to be discharged smoothly and be sucked into the double - stage dust collector 9, resulting in ignition; excessive air leakage from the discharge air lock 16 leads to poor falling of cut tobacco, which accumulates above the discharge air lock 16, causing blockage, and the subsequent expanded cut tobacco is sucked into the double - stage dust collector 9, resulting in ignition; excessive air leakage from the dust discharge air lock 20 below the double - stage dust collector 9 causes poor falling of dust and smoke, which accumulates at the cone of the dust collector; the change in the negative pressure value of the process gas. When the negative pressure value is high, it will cause cut tobacco foam and dust not to be completely separated and discharged through the cyclone dust collector, resulting in cut tobacco foam possibly adhering to the inner wall of the pipeline, forming carbonized lumps, which will contact with oxygen and self - ignite after being discharged through the discharge air lock 16; improper handling, incomplete maintenance during operation, repair, and maintenance, and water entering the process pipeline cause the cut tobacco ash to mix with water and adhere to the inner wall of the pipeline, forming carbonized lumps, which will contact with oxygen and self - ignite after being discharged through the discharge air lock 16; there is also a fire risk in the sublimation device that natural gas in the combustion furnace leaks. When it reaches a certain concentration and encounters a spark, a fire will occur. Generally, the probability of this kind of fire risk is relatively low. Due to the above reasons, the cut tobacco or dust stays in the pipeline for too long, and after carbonization and contact with air, it will cause ignition.

[0028] The fire risk control device of the embodiment of the present application adopts the gaseous carbon dioxide fire - extinguishing method and uses the fire - extinguishing effect and partial cooling effect of carbon dioxide to extinguish the fire. Carbon dioxide has a relatively high density, about 1.5 times that of air. When extinguishing a fire, carbon dioxide gas can displace air and surround the surface of the burning object or be distributed in a relatively enclosed space, reducing the oxygen concentration around the combustible or in the protected space, and producing a sealing effect to extinguish the fire.

[0029] The dry - ice cut tobacco of the puffing line is obtained by soaking and decompressing liquid carbon dioxide. The cold - end equipment of the puffing line controls the pressure, temperature, and state of carbon dioxide. Therefore, the present application considers using the fire - extinguishing characteristics of carbon dioxide to design a hot - end fire risk control device. In the carbon dioxide circulation system at the cold end, considering aspects such as the fire - extinguishing demand of carbon dioxide, the temperature of carbon dioxide required for cooling, and the safe operating pressure of the fire - extinguishing pipeline, a set of carbon dioxide pipelines dedicated for fire - extinguishing can be selected from the high - pressure tank.

[0030] Refer to Figure 2Dry ice puffing line hot end fire risk control device, a carbon dioxide fire extinguishing pipeline is set at the hot end of the dry ice puffing line. When an abnormal alarm occurs at the hot end, carbon dioxide can be introduced into the inspection door 5 at the hot end through the opening of the first electric valve 4, through the main pipe 2 and the first branch pipe 3. The carbon dioxide can enter the entire process pipeline at the hot end from the inspection door 5, and the carbon dioxide extinguishing effect and partial cooling effect are used to extinguish the fire. Carbon dioxide has high fluidity and can penetrate and cover all the cut tobacco in the process pipeline and cool it, and the fire risk is eliminated more thoroughly; carbon dioxide fire extinguishing is non-conductive, leaves no trace after use, and does not damage the protected object, which can effectively protect the expanded cut tobacco in the process pipeline and the environment at the production site; carbon dioxide has a cooling function and can evenly cool the fire risk part in time, which is convenient for the equipment to carry out the next maintenance or restoration in time. The inspection door 5 at the hot end of the dry ice puffing line is connected to the main pipe 2 through the first branch pipe 3, and a third electric valve 11 is set on the first branch pipe 3 to control the introduction of carbon dioxide.

[0031] In some embodiments, the fire risk control device includes a second branch pipe 6. The number of the second branch pipes 6 is multiple. One end of each second branch pipe 6 is connected to the output end of the main pipe 2. The cyclone separator 7, the cooling vibrating trough 8, and the double dust collector 9 at the hot end of the dry ice puffing line are respectively connected to a second branch pipe 6. In the embodiment of the present application, the output end of the main pipe 2 is connected to multiple second branch pipes 6. One of the second branch pipes 6 is connected to the cyclone separator 7 at the hot end, one second branch pipe 6 is connected to the cooling vibrating trough 8 at the hot end, and one second branch pipe 6 is connected to the double dust collector 9 at the hot end, so as to facilitate the accurate delivery of carbon dioxide from the main pipe 2 to the cyclone separator 7, the cooling vibrating trough 8, and the double dust collector 9 through the second branch pipes 6 respectively, and ensure timely fire extinguishing and temperature reduction of the above three parts. The carbon dioxide pipelines (the main pipe 2 and the second branch pipes 6) in the embodiment of the present application should all meet the pressure requirements, and the pipelines need to pass the pressure test.

[0032] In some embodiments, the fire risk control device includes multiple second electric valves 10, and the second electric valves 10 are respectively set on the second branch pipes 6. In the embodiment of the present application, the second branch pipes 6 are respectively controlled by the second electric valves 10, so as to facilitate the separate regulation of the carbon dioxide introduction position and efficiently extinguish the fire and reduce the temperature.

[0033] The parts at the hot end of the dry ice puffing line prone to fire risk are the cyclone separator 7, the cooling vibrating trough 8, and the double dust collector 9. The cyclone separator 7 is designed based on the principles of inertial dust removal and gravity dust removal. The cyclone separator 7 is a non-net type, and the main body material is stainless steel. A manhole and an inspection hole are provided on the separator body, and there is a fire extinguishing and cleaning port at the lower part; when the system catches fire, the valve can be manually opened for fire extinguishing, and this port can also be used as the cleaning water inlet of the discharge air lock 16.

[0034] The double - stage dust collector 9 is used to remove the soot contained in the process gas in the system, preventing the occurrence of dangers such as fire and explosion after the soot accumulates in the expansion system. It mainly consists of a dust removal body, an air outlet hopper, a dust collection hopper, an explosion - proof door, a frame body, a heat - insulating layer, a fire - extinguishing device, etc. The process gas to be treated can reach 300 °C. The explosion - proof door is located at the top of the dust collector. When the internal pressure of the system exceeds the set value, the explosion - proof door opens to release pressure and then automatically resets. A fire - extinguishing water pipe is installed on the dust collection hopper. When the system catches fire, the valve can be manually opened to inject cold water for fire extinguishing. The dust - locking device 20 is installed at the lower end of the double - stage dust collector 9, used to discharge the dust separated by the dust collector from the system and prevent excessive air from leaking into the system. It consists of two rotors in series, and the rotational speed of the lower rotor is higher than that of the upper rotor.

[0035] The cooling vibrating trough 8, that is, the trough body of the cooling vibrating conveyor, is provided with a discharge flap door in the middle, and a spark detector 17 is set at the feeding port. When the spark detector 17 detects a spark in the expanded cut tobacco, the PLC sends a signal, the cylinder on the side of the trough body acts, and the pneumatic flap door on the bottom surface of the trough body opens, and the expanded cut tobacco containing sparks is quickly discharged, ensuring the quality of the cut tobacco and the safety of the subsequent equipment.

[0036] Refer to Figure 1 , for the parts prone to fire hazards at the hot end of the dry - ice expansion line, the existing fire - extinguishing device uses the method of flushing with the fire - extinguishing waterway 12. One is set at the lower part of the arc surface of the cyclone separator 7, and the other two are set on the sides of the dust collection hoppers of the two double - stage dust collectors 9. However, there are the following defects in its fire - extinguishing method. Because there is only one water inlet, the flushing range is limited, and the fire - extinguishing effect is not good in actual use; when opening the water valve of the fire - extinguishing device of the cyclone separator 7, after the water flows out from each fire - hazard part, it is necessary to remove the inspection door 5 at the corresponding position to remove the blockage. But just when the inspection door 5 cover is opened, the remaining smoldering cut tobacco inside may catch fire when encountering oxygen; the water content of the expanded cut tobacco is relatively low (<5%). After opening the water valve, the expanded cut tobacco will absorb a large amount of water, blocking the entire process path more tightly; after the cyclone separator 7 and the double - stage dust collector 9 catch fire, the temperature is very high. Flushing with cold water for fire - extinguishing will cause the equipment to suddenly contract, and excessive deformation may cause the equipment to crack and be damaged; a large amount of flushing water for fire - extinguishing will carry out tobacco dust, soot, etc. from the process path, resulting in the destruction of the production site environment and being not conducive to maintenance and restoration at the same time.

[0037] In some embodiments, the fire risk control device further includes an oxygen content detector 14, which is installed on a vertical pipeline connecting the double - dust collector 9 and the main fan 13 at the hot end of the dry - ice puffing line. In the embodiments of the present application, the oxygen content detector 14 is used to detect the oxygen content in the process pipeline. When the oxygen content exceeds the set value of 8.5%, the equipment maintenance personnel check whether the sealing of the process pipeline is good, and check whether the inlet and outlet air locks 16 have too large a gap, resulting in too much oxygen entering; when the oxygen content exceeds the set value of 13%, the feed air lock 18 stops feeding, the first electric valve 4 on the main pipe 2 and the third electric valve 11 on the first branch pipe 3 of the inspection door 5 are opened, and carbon dioxide gas is injected into the process pipeline until the oxygen content is reduced to 8.5%, then the first electric valve 4 and the third electric valve 11 are closed, and the injection of carbon dioxide is stopped. At this time, the technician can judge whether to continue feeding or cool down and stop for maintenance. Further, the fire risk control device further includes a control system, and the oxygen content detector 14 is connected to the control system to transmit signals to the control system. The fire risk control device further includes a control system, and the first electric valve 4 is connected to the control system.

[0038] When the spark detector 17 detects a spark, the first electric valve 4 on the main pipe 2 and the second electric valve 10 on the second branch pipe 6 connected to the cyclone separator 7 and the cooling vibrating trough 8 are opened, and carbon dioxide is introduced into the cyclone separator 7 and the cooling vibrating trough 8 until the spark detector 17 gives no fire risk alarm, then the electric valve is closed.

[0039] In some embodiments, the fire risk control device further includes a temperature sensor 15, and the temperature sensors 15 are respectively arranged on the double - dust collector 9. When any one of the temperature sensors 15 on the double - dust collector 9 detects that the temperature of the dust - removing body is greater than the set value of 300 °C, the feed air lock 18 stops feeding, the first electric valve 4 on the main pipe 2 and the second electric valve 10 on the second branch pipe 6 of the double - dust collector 9 are opened, and carbon dioxide gas is injected into the double - dust collector 9. When the temperature detected by the temperature sensor 15 drops below 200 °C, the injection of carbon dioxide is stopped. At this time, if the temperature of the dust - removing body does not rise any more, the technician judges whether to continue feeding or cool down and stop for maintenance. Further, the fire risk control device further includes a control system, and the temperature sensor 15 is connected to the control system to transmit signals to the control system.

[0040] The hot-end fire risk control device of the dry ice puffing line according to the embodiment of the present application utilizes the characteristic of high fluidity of carbon dioxide, can penetrate and cover all the cut tobacco in the process pipeline and cool the cut tobacco, and the fire risk elimination is more thorough; carbon dioxide fire extinguishing is non-conductive, leaves no trace after use, and does not damage the protected object, and can effectively protect the expanded cut tobacco in the process pipeline and the environment of the production site; carbon dioxide has a cooling function, can evenly cool the fire risk part in time, and is convenient for the equipment to carry out the next maintenance or restoration in time. The fire risk control device according to the embodiment of the present application can be set to full-automatic control, can play the roles of fire risk prevention and fire extinguishing at the same time, does not require manual participation in fire extinguishing, and effectively guarantees the safety of equipment and personnel. In the second aspect of the embodiment of the present application, a hot end of a dry ice puffing line is provided, including the above-mentioned fire risk control device. The above-mentioned fire risk control device is applicable to all dry ice cut tobacco puffing lines, has a wide range of uses and strong practicability.

[0041] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fire risk control device for the hot end of a dry ice expansion line, characterized in that: It includes a carbon dioxide high-pressure tank, a main pipe, a first branch pipe and a first electric valve. The first electric valve is arranged on the main pipe. The main pipe is connected to the output end of the carbon dioxide high-pressure tank. One end of the first branch pipe is connected to the output end of the main pipe, and the other end is connected to the inspection door of the hot end of the dry ice expansion line.

2. The hot end fire risk control device of the dry ice expansion line according to claim 1 is characterized in that: The fire risk control device includes a second branch pipe, and the number of the second branch pipes is multiple. One end of each of the second branch pipes is connected to the output end of the main pipe, and the cyclone separator, cooling vibration trough, and double dust collector at the hot end of the dry ice expansion line are respectively connected to one of the second branches.

3. The hot end fire risk control device of the dry ice expansion line according to claim 2 is characterized in that: The fire risk control device includes a plurality of second electric valves, and the second electric valves are respectively arranged on the second branch pipes.

4. The hot end fire risk control device of the dry ice expanding line according to any one of claims 1 to 3, characterized in that: The fire risk control device further comprises a control system, and the first electric valve is connected to the control system.

5. The hot end fire risk control device of the dry ice expansion line according to claim 4 is characterized in that: The fire risk control device also includes an oxygen content detector, which is installed on a vertical pipeline between a double dust collector connected to the hot end of the dry ice expanding line and a main fan at the hot end of the dry ice expanding line.

6. The hot end fire risk control device of the dry ice expansion line according to claim 5, characterized in that: The oxygen content detector is connected to the control system to transmit signals to the control system.

7. The hot end fire risk control device of the dry ice expansion line according to claim 5, characterized in that: The fire risk control device also includes a temperature sensor, and the temperature sensors are respectively arranged on the double dust collectors.

8. The hot end fire risk control device of the dry ice expansion line according to claim 7, characterized in that: The temperature sensor is connected to the control system to transmit a signal to the control system.

9. A hot end of a dry ice expansion line, characterized in that: A fire control device comprising the fire control device according to any one of claims 1 to 8.

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