Carbon fiber processing waste gas emission and incineration system

Abstract

The utility model provides a carbon fiber processing waste gas emission incineration system which comprises a gas inlet channel, a heat storage type incinerator and an SCR denitration reactor, and the heat storage type incinerator is provided with a first gas inlet allowing waste gas to enter the heat storage type incinerator to be incinerated and a first gas outlet used for discharging the incinerated waste gas. The first exhaust port is connected with an air inlet of the SCR denitration reactor; the gas inlet channel comprises an oxidized waste gas channel and a polymerized and purified waste gas channel, one end of the oxidized waste gas channel and one end of the polymerized and purified waste gas channel are both connected with the first gas inlet, and the other end of the oxidized waste gas channel is used for being connected with a waste gas discharge outlet of an oxidizing furnace in the carbon fiber processing system; and the other end of the polymerization and purification waste gas channel is used for being connected with a waste gas discharge port of a polymerization device and a waste gas discharge port of a purification device in the carbon fiber processing system. According to the technical scheme provided by the utility model, the waste gas treatment capacity is better, and the reached emission standard is lower, so that the influence on the environment can be effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of carbon fiber production, and in particular relates to a carbon fiber processing waste gas emission incineration system. Background Art

[0002] Carbon fiber is an inorganic polymer fiber with a carbon content of more than 92%. It is a high-strength and high-modulus high-temperature resistant fiber and a high-end variety of chemical fiber. Among them, the carbon content is more than 99% is called graphite fiber. The performance of engineering materials composited with carbon fiber is better than that of metal materials. The tensile strength of engineering materials composited with carbon fiber is 3-4 times higher than that of steel, the fatigue resistance is 2 times higher than that of steel, the weight is 3-4 times lighter than that of steel, and the thermal expansion is 4-5 times smaller than that of steel. Engineering materials composited with carbon fiber have the advantages of high hardness, high strength, light weight, high chemical resistance, high temperature resistance and low thermal expansion. Carbon fiber is widely used in aerospace, high-speed rail transportation, sports goods, chemical machinery, power facilities and textile machinery.

[0003] The waste gas generated in the production process of polyacrylonitrile carbon fiber mainly comes from three links: pre-oxidation process; low-temperature and high-temperature carbonization process; polymerization and purification process.

[0004] Among them, the main gas emitted during the pre-oxidation process is air, and the total gas emission is much greater than the tail gas produced, and its main components are CO2, CO and spinning aids. The waste gas components in the carbonization process (LT, HT) are relatively large, and one of the main harmful substances is hydrogen cyanide (HCN). The waste gas generated during the polymerization and purification process is mainly acrylonitrile and dimethyl sulfoxide.

[0005] The pre-oxidation process is mainly carried out in the oxidation furnace. The main tail gas produced in the pre-oxidation process is water vapor, and there are also small amounts of HCN, NH3, H2, CO2, etc. The amount of waste gas produced in the oxidation furnace is large, but the concentration of toxic gases is low. Among them, the amount and composition of waste gas from the oxidation furnace are shown in Table 1 below.

[0006] Table 1:

[0007]

[0008] The polymerization and purification process includes a polymerization process and a purification process. The polymerization process is mainly carried out in a polymerization device, and the purification process is mainly carried out in a purification device.

[0009] The exhaust gases and their components from both the polymerization unit and the purification unit are shown in Table 2 below.

[0010] Table 2:

[0011]

[0012] At present, the existing carbon fiber processing waste gas emission incineration system is mainly used to treat the waste gas from the oxidation furnace, while the waste gas generated by the polymerization device and the purification device is generally treated by spray washing. Among them, the spray washing method does not treat the waste gas cleanly and is easy to affect the environment, so this situation needs to be solved. Utility Model Content

[0013] Therefore, the utility model provides a carbon fiber processing waste gas emission incineration system, which can solve the technical problem that the waste gas generated in both the polymerization device and the purification device in the prior art cannot be cleaned by spray washing and is easy to affect the environment.

[0014] In order to solve the above problems, the utility model provides a carbon fiber processing waste gas emission incineration system, which includes an air intake channel, a regenerative incinerator and an SCR denitration reactor, the regenerative incinerator has a first air intake port for the waste gas to enter the interior for incineration and a first exhaust port for discharging the incinerated waste gas, the first exhaust port is connected to the air intake port of the SCR denitration reactor;

[0015] Among them, the air intake channel includes an oxidation waste gas channel and a polymerization purification waste gas channel, one end of each of the oxidation waste gas channel and the polymerization purification waste gas channel is connected to the first air intake port, the other end of the oxidation waste gas channel is used to be connected to the waste gas discharge port of the oxidation furnace in the carbon fiber processing system, and the other end of the polymerization purification waste gas channel is used to be connected to the waste gas discharge port of the polymerization device and the waste gas discharge port of the purification device in the carbon fiber processing system.

[0016] In some embodiments, a first flame arrester and a first fan are provided on the polymerization purification waste gas channel, and the first fan is arranged between the first flame arrester and the regenerative thermal incinerator.

[0017] In some embodiments, a filter, a second flame arrester and a second fan are provided on the oxidation waste gas channel, the second fan is arranged between the second flame arrester and the regenerative thermal incinerator, the filter is used to filter the waste gas in the oxidation waste gas channel, and the filter is arranged on the upstream side of the second flame arrester.

[0018] In some embodiments, the regenerative incinerator has a purge gas inlet, an incineration chamber A, an incineration chamber B, and an incineration chamber C, and the incineration chamber A, the incineration chamber B, and the incineration chamber C are connected in sequence;

[0019] Wherein, the first air inlet is connected to the incineration chamber A through the first A pipe, connected to the incineration chamber B through the second A pipe, and connected to the incineration chamber C through the third A pipe, and the first A pipe, the second A pipe and the third A pipe are all provided with a first switch valve;

[0020] The purge gas inlet is connected to the incineration chamber A through a first B pipe, connected to the incineration chamber B through a second B pipe, and connected to the incineration chamber C through a third B pipe. The first B pipe, the second B pipe and the third B pipe are all provided with a second switch valve;

[0021] The first exhaust port is connected to the incineration chamber A through a first C pipe, connected to the incineration chamber B through a second C pipe, and connected to the incineration chamber C through a third C pipe. The first C pipe, the second C pipe and the third C pipe are all provided with a third switch valve.

[0022] In some embodiments, a first air pressure sensor is provided at the first air inlet, and the first air pressure sensor is used to detect the air pressure at the first air inlet. A second air pressure sensor is provided at the first exhaust port, and the second air pressure sensor is used to detect the air pressure at the first exhaust port.

[0023] In some embodiments, the SCR denitration reactor has a cavity connected to both its air inlet and exhaust port, and an ammonia injection structure is provided in the air inlet channel of the SCR denitration reactor, and the ammonia injection structure is used to inject an ammonia solution into the exhaust gas in the air inlet channel;

[0024] A rectifier and a catalyst layer are provided in the cavity. The rectifier is located between the catalyst layer and the air inlet channel. The rectifier is used to rectify the fluid flowing out of the air inlet channel and introduce the rectified fluid into the catalyst layer so that the rectified fluid undergoes a chemical reaction under the action of the catalyst layer to denitrate the exhaust gas.

[0025] In some embodiments, the pipe connections at both the air inlet and the exhaust port of the SCR denitration reactor are flexible connections.

[0026] In some embodiments, the carbon fiber processing waste gas emission incineration system further includes a heat exchanger, the heat exchanger having a first heat exchange channel and a second heat exchange channel capable of heat exchange, the first heat exchange channel being used to connect to the exhaust port of the SCR denitration reactor;

[0027] The second heat exchange channel is used to be connected to the fresh air channel of the oxidation furnace in the carbon fiber processing system and / or to be connected to the fresh air channel of the drying furnace in the carbon fiber processing system.

[0028] In some embodiments, the heat exchanger has a shell, a first partition plate and a second partition plate are arranged in the shell, both the first partition plate and the second partition plate are sealed with the inner wall of the shell along the circumferential direction, and the first heat exchange channel is formed in the space between the first partition plate and the second partition plate inside the shell;

[0029] The shell has a first connector at one end close to the first partition plate, and has a second connector at one end close to the second partition plate; the heat exchanger also has a heat exchange tube, the heat exchange tube passes through the first heat exchange channel, one end of the heat exchange tube is installed on the first partition plate and communicated with the inside of the first connector; the other end of the heat exchange tube is installed on the second partition plate and communicated with the inside of the second connector; the second heat exchange channel is formed inside the heat exchange tube; the second heat exchange channel is connected to the fresh air channel of the oxidation furnace in the carbon fiber processing system and / or the fresh air channel of the drying furnace in the carbon fiber processing system through the first connector and the second connector;

[0030] A baffle is also provided in the first heat exchange channel, and the baffle is used to change the flow direction of the fluid in the first heat exchange channel;

[0031] The shell is also provided with a drain port communicated with the first heat exchange channel.

[0032] In some embodiments, an end of the first heat exchange channel away from the SCR denitration reactor is connected to an exhaust pipe;

[0033] Wherein, a dust collector is provided on the exhaust duct, and the dust collector is used to remove dust from the gas flowing through the exhaust duct; and / or, a third fan is provided on the exhaust duct, and the third fan is a variable frequency fan.

[0034] The utility model provides a carbon fiber processing waste gas emission incineration system which has the following beneficial effects:

[0035] 1. Compared with the prior art method of treating the waste gas generated by both the polymerization device and the purification device by spray washing, the solution of the utility model treats the waste gas generated by both the polymerization device and the purification device by combining a regenerative incinerator and an SCR denitration reactor. The treatment effect is better and the actual emission standard achieved is lower, thereby effectively reducing the impact on the environment.

[0036] 2. The carbon fiber processing waste gas emission incineration system of the utility model has better waste gas treatment capability and achieves lower emission standards, thereby effectively reducing the impact on the environment.

[0037] 3. By setting up a heat exchanger, the heat in the exhaust gas discharged from the SCR denitration reactor can be used to preheat the fresh air of the oxidation furnace and / or the fresh air of the drying furnace, so as to realize heat recovery and utilization, thereby saving energy and reducing consumption.

[0038] 4. The production line can be operated continuously and stably, with an operating cycle of more than 3 months. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0040] Figure 1 This is a structural block diagram of a carbon fiber processing waste gas emission incineration system provided by an embodiment of the utility model;

[0041] Figure 2 It is a structural schematic diagram of a regenerative incinerator provided by an embodiment of the utility model;

[0042] Figure 3 This is a schematic structural diagram of an SCR denitration reactor provided by an embodiment of the utility model;

[0043] Figure 4 It is a structural schematic diagram of a heat exchanger provided in one embodiment of the utility model.

[0044] The accompanying drawings are marked as follows:

[0045] 1. First flame arrester; 2. First fan; 3. Regenerative incinerator; 4. SCR denitration reactor; 5. Heat exchanger; 6. Dust collector; 7. Third fan; 8. Chimney; 9. Filter; 10. Second flame arrester; 11. Second fan; 29. ​​Polymerization purification waste gas channel; 30. Oxidation waste gas channel; 31. Cavity; 32. Ammonia injection structure; 33. Rectifier; 34. Catalyst layer; 301. Air inlet; 302. Exhaust port; 41. First connector; 42. Shell; 43. Baffle; 44. Heat exchange tube; 45. Drain port; 46. Second connector; 47. First partition plate; 48. Second Partition plate; 401, fresh air inlet; 402, fresh air outlet; 403, exhaust gas inlet after incineration; 404, exhaust gas outlet after heat exchange; 405, second heat exchange channel; 406, first heat exchange channel; 51, incineration chamber A; 52, incineration chamber B; 53, incineration chamber C; 54, purge gas inlet; 55, first air inlet; 56, first exhaust port; 551, first A pipeline; 552, second A pipeline; 553, third A pipeline; 541, first B pipeline; 542, second B pipeline; 543, third B pipeline; 561, first C pipeline; 562, second C pipeline; 563, third C pipeline. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0047] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0048] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0049] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0050] See also Figure 1 As shown, according to an embodiment of the utility model, a carbon fiber processing waste gas emission incineration system is provided, which includes an air intake channel, a regenerative incinerator 3 and an SCR denitration reactor 4. The regenerative incinerator 3 has a first air intake port 55 for the waste gas to enter the interior for incineration and a first exhaust port 56 for discharging the incinerated waste gas. The first exhaust port 56 is connected to the air intake port 301 of the SCR denitration reactor 4 to introduce the incinerated waste gas into the SCR denitration reactor 4 for further treatment.

[0051] The above-mentioned air inlet channel includes an oxidation waste gas channel 30 and a polymerization purification waste gas channel 29. One end of the oxidation waste gas channel 30 and the polymerization purification waste gas channel 29 are both connected to the first air inlet 55. The other end of the oxidation waste gas channel 30 is used to connect to the waste gas discharge port of the oxidation furnace in the carbon fiber processing system. The other end of the polymerization purification waste gas channel 29 is used to connect to the waste gas discharge port of the polymerization device and the waste gas discharge port of the purification device in the carbon fiber processing system.

[0052] In the above example, the oxidation furnace in the carbon fiber processing system discharges the waste gas into the regenerative incinerator 3 through the oxidation waste gas channel 30 through its waste gas discharge port, the polymerization device in the carbon fiber processing system discharges the waste gas into the regenerative incinerator 3 through the polymerization purification waste gas channel 29 through its waste gas discharge port, and the purification device in the carbon fiber processing system also discharges the waste gas into the regenerative incinerator 3 through the polymerization purification waste gas channel 29 through its waste gas discharge port. After the waste gas is incinerated in the regenerative incinerator 3, it is further processed in the SCR denitration reactor 4. Among them, the carbon fiber processing waste gas emission and incineration system of the utility model can not only process the waste gas of the oxidation furnace, but also process the waste gas of both the polymerization device and the purification device, so that its waste gas processing capacity is stronger and the scope of application is wider.

[0053] Compared with the prior art method of treating the waste gas generated in both the polymerization device and the purification device by spray washing, the solution of the utility model treats the waste gas generated in both the polymerization device and the purification device by cooperating with the regenerative heat incinerator 3 and the SCR denitrification reactor 4, and the treatment effect is better, and the actual emission standard achieved is lower, thereby effectively reducing the impact on the environment.

[0054] Among them, after the exhaust gas is introduced into the above-mentioned carbon fiber processing exhaust gas emission incineration system for treatment, the output of the treated exhaust gas can reach the indicators in the following Table 3.

[0055] Table 3:

[0056]

[0057] The output indicators after the waste gas is treated by the existing method are shown in Table 4 below.

[0058] Table 4:

[0059] Components unit index HCN <![CDATA[mg / m 3 ]]> 1.9 NOx <![CDATA[mg / m 3 ]]> 150 SO2 <![CDATA[mg / m 3 ]]> 150 Non-methane hydrocarbons <![CDATA[mg / m 3 ]]> 120

[0060] By comparing Table 3 and Table 4, it can be seen that the carbon fiber processing waste gas emission incineration system of the utility model has a better waste gas treatment capability and achieves a lower emission standard, thereby effectively reducing the impact on the environment.

[0061] In some embodiments, Figure 1 As shown, the polymerization purification waste gas channel 29 may be provided with a first flame arrester 1 and a first fan 2, and the first fan 2 is arranged between the first flame arrester 1 and the regenerative thermal incinerator 3. The first fan 2 is used to accelerate the flow of the fluid in the polymerization purification waste gas channel 29.

[0062] The first flame arrester 1 is used to prevent the exhaust gas from exploding or burning to protect the safety of subsequent equipment.

[0063] In some embodiments, Figure 1 As shown, the aforementioned oxidation waste gas channel 30 may be provided with a filter 9, a second flame arrester 10 and a second fan 11. The second fan 11 is arranged between the second flame arrester 10 and the regenerative thermal incinerator 3, and the filter 9 is used to filter the waste gas in the oxidation waste gas channel 30, and the filter 9 is arranged on the upstream side of the second flame arrester 10.

[0064] The waste gas in the oxidation waste gas channel 30 is easily mixed with the hair in the oxidation furnace, and the filter 9 can filter the hair in the waste gas. The second fan 11 is used to accelerate the flow of the fluid in the oxidation waste gas channel 30. The second flame arrester 10 is used to prevent the waste gas from exploding or burning to protect the safety of subsequent equipment.

[0065] The aforementioned regenerative incinerator 3 may also be referred to as RTO. In some embodiments, the aforementioned regenerative incinerator 3 may be a three-tank regenerative incinerator. Specifically, Figure 2 As shown, the regenerative incinerator 3 may have a purge gas inlet 54, an incineration chamber A 51, an incineration chamber B 52 and an incineration chamber C 53. The incineration chamber A 51, the incineration chamber B 52 and the incineration chamber C 53 are connected in sequence. Among them, the aforementioned first air inlet 55 is connected to the incineration chamber A 51 through the first A pipe 551, and is connected to the incineration chamber B 52 through the second A pipe 552, and is connected to the incineration chamber C 53 through the third A pipe 553. The first A pipe 551, the second A pipe 552 and the third A pipe 553 are all provided with a first switch valve. The aforementioned purge gas inlet 54 is connected to the incineration chamber A 51 through the first B pipe 541, and is connected to the incineration chamber B 52 through the second B pipe 542, and is connected to the incineration chamber C 53 through the third B pipe 543. The first B pipe 541, the second B pipe 542 and the third B pipe 543 are all provided with a second switch valve. The first exhaust port 56 is connected to the combustion chamber A 51 through the first C pipe 561, is connected to the combustion chamber B 52 through the second C pipe 562, and is connected to the combustion chamber C 53 through the third C pipe 563. The first C pipe 561, the second C pipe 562 and the third C pipe 563 are all provided with a third switch valve.

[0066] In the above example, by setting each first switch valve, each second switch valve and each third switch valve, the first A pipeline 551, the second A pipeline 552, the third A pipeline 553, the first B pipeline 541, the second B pipeline 542, the third B pipeline 543 and the first C pipeline 561, the second C pipeline 562 and the third C pipeline 563 can all be turned on and off, so that the above-mentioned thermal storage incinerator 3 can operate according to the three-stage operation logic in Table 5 below.

[0067] Table 5:

[0068] Incineration Room A Incineration Room B Incineration Chamber C Phase 1 Air Intake Vent Purge Phase II Purge Air Intake Vent Phase 3 Vent Purge Air Intake

[0069] Among them, the waste gas enters the regenerative incinerator 3 for incineration treatment, and the temperature of the waste gas after incineration is 180-210℃. The working principle of the regenerative incinerator 3 is as follows: First, the regenerative incinerator 3 is preheated. After the preheating process is completed, the regenerative incinerator 3 enters the operating state. The regenerative incinerator 3 operates in accordance with the first stage, the second stage and the third stage in Table 5 above. After the third stage is completed, it enters the first stage again, and so on. In the first stage, the waste gas first passes through the ceramic regenerative bed of the combustion chamber A 51, is gradually preheated to its auto-ignition temperature, and an oxidation reaction occurs in the combustion chamber to generate CO2 and H2O, and then enters the ceramic regenerative bed of the combustion chamber B 52 to release heat, and accumulates heat in the ceramic regenerative bed of the combustion chamber B 52. At this time, the combustion chamber C 53 is purged, and the regenerative bed temperatures of the combustion chambers A 51 and B 52 are gradually reduced from top to bottom. The operating logic of the second and third stages can refer to Table 5 above. With reference to the concentration and auto-ignition point of the waste gas, preferably, the temperature of the waste gas treatment in the regenerative incinerator 3 is 800-1000°C, the optimal waste gas treatment temperature is 850-930°C, the waste gas treatment time in each stage in the above Table 5 is 1-5s, the regenerative incinerator 3 usually uses natural gas as fuel, and the regenerative incinerator 3 has a built-in high-efficiency thermal storage ceramic, and the thermal storage efficiency can reach more than 95%. The above-mentioned regenerative incinerator 3 has a better treatment effect on waste gas, can efficiently remove nitrogen oxides and particulate matter, and the remaining components are up to standard.

[0070] In some embodiments, a first air pressure sensor may be provided at the aforementioned first air inlet 55 , and the first air pressure sensor is used to detect the air pressure at the first air inlet 55 . A second air pressure sensor may be provided at the first exhaust port 56 , and the second air pressure sensor is used to detect the air pressure at the first exhaust port 56 .

[0071] The air pressure at the first air inlet 55 is P1, and the air pressure at the first air outlet 56 is P2. The aforementioned carbon fiber processing waste gas emission incineration system may also include an alarm device, which is used to perform an alarm response when P is not within a preset range; wherein P = P1-P2. The alarm response may be a sound alarm, a text display alarm, or a light flashing alarm.

[0072] In the above example, when P is not within the preset range, it means that the exhaust gas intake into the regenerative thermal incinerator 3 may be insufficient; or the exhaust gas does not flow into the regenerative thermal incinerator 3, causing dry burning of the regenerative thermal incinerator 3; or the silica dust in the regenerative thermal incinerator 3 needs to be cleaned, and the alarm of the alarm device can remind the operating personnel to deal with it in time.

[0073] It should be noted here that the first air pressure sensor and the second air pressure sensor mentioned above can both be differential pressure transmitters.

[0074] In some embodiments, Figure 3 As shown, the aforementioned SCR denitration reactor 4 may have a cavity 31 connected to both its air inlet 301 and exhaust port 302. An ammonia spraying structure 32 is provided in the air inlet channel of the SCR denitration reactor 4, and the ammonia spraying structure 32 is used to spray an ammonia solution into the exhaust gas in the air inlet channel, and the ammonia solution may be a 20% ammonia solution. The ammonia spraying structure 32 may be a nozzle, etc. A rectifier 33 and a catalyst layer 34 are provided in the cavity 31. The rectifier 33 is located between the catalyst layer 34 and the air inlet channel. The rectifier 33 is used to rectify the fluid flowing out of the air inlet channel, and introduce the rectified fluid into the catalyst layer 34, so that the rectified fluid undergoes a chemical reaction under the action of the catalyst layer 34 to denitrate the exhaust gas.

[0075] The working principle of the above-mentioned SCR denitration reactor 4 is as follows: using ammonia solution as a reducing agent, the ammonia spraying structure 32 mixes the ammonia solution into the exhaust gas, and the ammonia solution reacts with the NOx in the exhaust gas on the surface of the active component of the catalyst layer 34. Specifically, the exhaust gas temperature entering the SCR denitration reactor 4 is 180-210°C, and the ammonia solution sprayed by the rectifier 33 and the ammonia spraying structure 32 converts the NOx in the exhaust gas into nitrogen and water at a temperature of 180-210°C using the catalyst layer 34. After treatment, the nitrogen oxide can reach 50mg / m 3 The following can further remove NOx from the exhaust gas and achieve ultra-low NOx emissions.

[0076] In some embodiments, the pipe connections at the air inlet 301 and the exhaust port 302 of the SCR denitration reactor 4 may both be flexible connections to eliminate the expansion stress of the high-temperature flue gas.

[0077] In some embodiments, Figure 1 and Figure 4 As shown, the aforementioned carbon fiber processing waste gas emission incineration system may also include a heat exchanger 5. The heat exchanger 5 has a first heat exchange channel 406 and a second heat exchange channel 405 for heat exchange. The first heat exchange channel 406 is used to connect to the exhaust port 302 of the SCR denitrification reactor 4. The second heat exchange channel 405 is used to connect to the fresh air channel of the oxidation furnace in the carbon fiber processing system and / or to the fresh air channel of the drying furnace in the carbon fiber processing system. It should be noted here that the function of the above-mentioned oxidation furnace is to cause the polyacrylonitrile fiber to undergo an oxidation reaction inside it. The oxidation furnace generally needs to continuously replenish fresh air and discharge exhaust gas to carry away the by-products of the reaction such as the exhaust gas mentioned above. The drying furnace is used to dry the carbon fiber, generally using hot fresh air at about 200 degrees Celsius for drying.

[0078] The heat exchanger 5 can utilize the heat in the exhaust gas discharged from the SCR denitration reactor 4 to preheat the fresh air of the oxidation furnace and / or the fresh air of the drying furnace, so as to realize heat recovery and utilization, thereby saving energy and reducing consumption. There can be two heat exchangers 5 to preheat the fresh air of the oxidation furnace and the fresh air of the drying furnace respectively, or the fresh air can enter the oxidation furnace and the drying furnace respectively after the heat is exchanged in the heat exchanger 5.

[0079] In some embodiments, Figure 4 As shown, the heat exchanger 5 may include a shell 42, in which a first partition plate 47 and a second partition plate 48 are provided. The first partition plate 47 and the second partition plate 48 are both circumferentially sealed with the inner wall of the shell 42. The space between the first partition plate 47 and the second partition plate 48 inside the shell 42 forms the aforementioned first heat exchange channel 406.

[0080] The aforementioned shell 42 has a first connector 41 at one end close to the first partition plate 47, and has a second connector 46 at one end close to the second partition plate 48. The heat exchanger 5 also has a heat exchange tube 44, which passes through the first heat exchange channel 406, and one end of the heat exchange tube 44 is installed on the first partition plate 47 and communicates with the inside of the first connector 41. The other end of the heat exchange tube 44 is installed on the second partition plate 48 and communicates with the inside of the second connector 46. The aforementioned second heat exchange channel 405 is formed inside the heat exchange tube 44. The number of heat exchange tubes 44 can be more than two. Among them, the second heat exchange channel 405 is connected to the fresh air channel of the oxidation furnace in the carbon fiber processing system and / or the fresh air channel of the drying furnace in the carbon fiber processing system through the first connector 41 and the second connector 46.

[0081] The heat exchanger 5 is a shell and tube design, which can avoid fresh air pollution. The temperature of the exhaust gas entering the first heat exchange channel 406 is generally 200-220°C, the temperature of the fresh air entering the heat exchange tube 44 is generally 25-30°C, and the temperature of the fresh air after heat exchange can reach 150-170°C.

[0082] like Figure 4 As shown, the first connector 41 has a fresh air inlet 401, and the second connector 46 has a fresh air outlet 402. The housing 42 is also provided with a post-incineration waste gas inlet 403 communicating with the first heat exchange channel 406 and a post-heat exchange waste gas outlet 404.

[0083] In some embodiments, Figure 4As shown, a baffle 43 may be further provided in the aforementioned first heat exchange channel 406, and the baffle 43 is used to change the flow direction of the fluid in the first heat exchange channel 406 to improve the heat exchange efficiency. The number of baffles 43 may be more than two, so that the exhaust gas in the first heat exchange channel 406 and the fresh air in the heat exchange tube 44 can be fully exchanged with each other.

[0084] In some embodiments, Figure 4 As shown, the housing 42 may be provided with a drain port 45 connected to the first heat exchange channel 406. After the exhaust gas in the first heat exchange channel 406 and the cold air in the heat exchange tube 44 undergo heat exchange, condensed water may be generated, and the condensed water may be discharged in time through the drain port 45 to avoid affecting the heat exchange process of the heat exchanger 5.

[0085] In some embodiments, Figure 1 As shown, the end of the aforementioned first heat exchange channel 406 that is away from the SCR denitration reactor 4 is connected to an exhaust pipe. Among them, a dust collector 6 can be provided on the exhaust pipe, and the dust collector 6 is used to remove dust from the gas flowing through the exhaust pipe. The casing of the dust collector 6 can be made of carbon steel, and the dust collector 6 has a filter bag inside. The dust collector 6 removes dust from the gas flowing through the exhaust pipe through the filter bag. The filter bag material is a high-temperature resistant filter bag. Since the exhaust gas contains silicone oil, a large amount of silica dust will be generated during the incineration of the exhaust gas, and the dust collector 6 can filter the silica dust, so that the production line can operate continuously and stably.

[0086] Among them, after the exhaust gas enters the dust collector 6 for dust removal, the concentration of particulate matter can be reduced to 15mg / m 3 The particle output index after the exhaust gas is treated by the existing method is 20mg / m 3 It can be seen that after the waste gas is treated by the solution of the utility model, the emission standard of particulate matter is lower.

[0087] In some embodiments, the aforementioned exhaust duct may be provided with a third fan 7, which may be a variable frequency fan, which may control the processing flow of the exhaust gas and the pressure on the first pipeline 13, the second pipeline 14, the third pipeline 21, the fourth pipeline 22, and the fifth pipeline 23. The purpose of regulating the exhaust gas processing flow is to meet the treatment of different exhaust gas air volumes. For example, the oxidation exhaust gas volume can be 40,000-80,000 cubic meters / h, and the polymerization purification exhaust gas can be 500-5,000 cubic meters / h, which can achieve an increase in the output of carbon fiber. After the output of carbon fiber is increased, the exhaust gas volume will also increase. The pressure on the pipeline is mainly used for monitoring to prevent blockage in each section.

[0088] In some embodiments, Figure 1As shown, the aforementioned exhaust duct can be connected to the chimney 8 to discharge the exhaust gas through the chimney 8.

[0089] Among them, the waste gas treated by the carbon fiber processing waste gas emission incineration system of the utility model meets the regulations, and the waste gas treatment reaches high-standard emission. The heat can be recovered through the heat exchanger 5 for the oxidation furnace fresh air and the drying furnace fresh air replenishment, achieving the maximum energy saving. In addition, the continuous and stable operation of the production line can be achieved, and the operation cycle can be as long as more than 3 months.

[0090] For ease of understanding, the overall structure of the utility model is described below, and its working principle is explained.

[0091] like Figure 1 As shown, the carbon fiber processing waste gas emission incineration system of the utility model includes an oxidation waste gas channel 30 and a polymerization purification waste gas channel 29. The waste gas in both the oxidation waste gas channel 30 and the polymerization purification waste gas channel 29 passes through the flame arrester, and is driven into the regenerative incinerator 3 by the corresponding fan for incineration treatment, and then enters the SCR denitration reactor 4 to further reduce the nitrogen oxide content, and then the oxidation furnace fresh air and the drying furnace fresh air are heat exchanged through the heat exchanger 5, and then enter the dust collector 6 to remove particulate matter in the flue gas, and then through the third fan 7 through the chimney 8 to achieve exhaust gas emission standards. Among them, a first temperature sensor 12 can be provided on the polymerization purification waste gas channel 29, and the first temperature sensor 12 is located on the upstream side of the first flame arrester 1. The first temperature sensor 12 is used to detect the temperature of the waste gas on the upstream side of the first flame arrester 1. The temperature of the waste gas on the upstream side of the first flame arrester 1 is generally 20-30°C. A second temperature sensor 24 may be provided on the polymerization purification waste gas channel 29. The second temperature sensor 24 is located between the first fan 2 and the regenerative thermal incinerator 3. The second temperature sensor 24 is used to detect the temperature of the waste gas downstream of the first fan 2. The temperature of the waste gas downstream of the first fan 2 is generally 20-30°C.

[0092] The oxidation waste gas passage 30 may be provided with a third temperature sensor 20, which is located on the upstream side of the filter 9. The third temperature sensor 20 is used to detect the waste gas temperature on the upstream side of the filter 9. The waste gas temperature on the upstream side of the filter 9 is generally 100-130°C. The oxidation waste gas passage 30 may be provided with a fourth temperature sensor 29, which is located between the second fan 11 and the regenerative thermal incinerator 3. The fourth temperature sensor 29 is used to detect the temperature of the waste gas on the downstream side of the second fan 11. The temperature of the waste gas on the downstream side of the second fan 11 is generally 100-130°C.

[0093] A fifth temperature sensor 15 may be provided at the first exhaust port 56, and the fifth temperature sensor 15 is used to detect the temperature of the exhaust gas after incineration. The temperature of the exhaust gas after incineration is generally 180-210°C. A sixth temperature sensor 25 may be provided at the air inlet 301 of the SCR denitration reactor 4, and the sixth temperature sensor 25 is used to detect the exhaust gas temperature at the air inlet 301 of the SCR denitration reactor 4, and the exhaust gas temperature at the air inlet 301 of the SCR denitration reactor 4 is generally 180-210°C. A seventh temperature sensor 26 may be provided at the exhaust gas inlet 403 after incineration of the heat exchanger 5, and the seventh temperature sensor 26 is used to detect the exhaust gas temperature at the exhaust gas inlet 403 after incineration of the heat exchanger 5, and the exhaust gas temperature at the exhaust gas inlet 403 after incineration of the heat exchanger 5 is generally 200-220°C. An eighth temperature sensor 27 may be provided at the fresh air inlet 401 of the heat exchanger 5, and the eighth temperature sensor 27 is used to detect the exhaust gas temperature at the fresh air inlet 401 of the heat exchanger 5, and the exhaust gas temperature at the fresh air inlet 401 of the heat exchanger 5 is generally 25-30° C. A ninth temperature sensor 28 is provided at the fresh air outlet 402 of the heat exchanger 5, and the ninth temperature sensor 28 is used to detect the exhaust gas temperature at the fresh air outlet 402 of the heat exchanger 5, and the exhaust gas temperature at the fresh air outlet 402 of the heat exchanger 5 is generally 150-170° C.

[0094] The above-mentioned temperature sensors can improve heat exchange efficiency, reduce heat loss, and achieve maximum energy saving. The above-mentioned pressure sensors can control pipeline pressure to ensure that exhaust gas meets emission standards.

[0095] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0096] The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the utility model should be included in the protection scope of the utility model. The above is only a preferred implementation of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the utility model, and these improvements and variations should also be regarded as the protection scope of the utility model.

Claims

1. A carbon fiber processing waste gas emission incineration system, characterized by: The invention comprises an air inlet passage, a regenerative incinerator (3) and an SCR denitration reactor (4), wherein the regenerative incinerator (3) has a first air inlet (55) for allowing waste gas to enter the interior for incineration and a first exhaust port (56) for exhausting the waste gas after incineration, and the first exhaust port (56) is connected to the air inlet (301) of the SCR denitration reactor (4); The air inlet channel comprises an oxidation waste gas channel (30) and a polymerization purification waste gas channel (29), one end of each of the oxidation waste gas channel (30) and the polymerization purification waste gas channel (29) is connected to the first air inlet (55), the other end of the oxidation waste gas channel (30) is used to be connected to the waste gas discharge port of the oxidation furnace in the carbon fiber processing system, and the other end of the polymerization purification waste gas channel (29) is used to be connected to the waste gas discharge port of the polymerization device and the waste gas discharge port of the purification device in the carbon fiber processing system.

2. The carbon fiber processing waste gas emission incineration system according to claim 1 is characterized in that: The polymerization purification waste gas channel (29) is provided with a first flame arrester (1) and a first fan (2), and the first fan (2) is arranged between the first flame arrester (1) and the regenerative thermal incinerator (3).

3. The carbon fiber processing waste gas emission incineration system according to claim 1, characterized in that: The oxidation waste gas channel (30) is provided with a filter (9), a second flame arrester (10) and a second fan (11); the second fan (11) is arranged between the second flame arrester (10) and the regenerative thermal incinerator (3); the filter (9) is used to filter the waste gas in the oxidation waste gas channel (30); the filter (9) is arranged on the upstream side of the second flame arrester (10).

4. The carbon fiber processing waste gas emission incineration system according to any one of claims 1 to 3, characterized in that: The regenerative incinerator (3) has a purge gas inlet (54), an incineration chamber A (51), an incineration chamber B (52) and an incineration chamber C (53), and the incineration chamber A (51), the incineration chamber B (52) and the incineration chamber C (53) are sequentially connected; The first air inlet (55) is connected to the incineration chamber A (51) through a first A pipe (551), connected to the incineration chamber B (52) through a second A pipe (552), and connected to the incineration chamber C (53) through a third A pipe (553), and the first A pipe (551), the second A pipe (552) and the third A pipe (553) are all provided with a first switch valve; The purge gas inlet (54) is connected to the incineration chamber A (51) through a first B pipe (541), is connected to the incineration chamber B (52) through a second B pipe (542), and is connected to the incineration chamber C (53) through a third B pipe (543), and the first B pipe (541), the second B pipe (542) and the third B pipe (543) are all provided with a second switch valve; The first exhaust port (56) is connected to the incineration chamber A (51) through a first C pipe (561), is connected to the incineration chamber B (52) through a second C pipe (562), and is connected to the incineration chamber C (53) through a third C pipe (563). The first C pipe (561), the second C pipe (562) and the third C pipe (563) are all provided with a third switch valve.

5. The carbon fiber processing waste gas emission incineration system according to any one of claims 1 to 3, characterized in that: A first air pressure sensor is provided at the first air inlet (55), and the first air pressure sensor is used to detect the air pressure at the first air inlet (55); a second air pressure sensor is provided at the first exhaust port (56), and the second air pressure sensor is used to detect the air pressure at the first exhaust port (56).

6. The carbon fiber processing waste gas emission incineration system according to any one of claims 1 to 3, characterized in that: The SCR denitration reactor (4) has a cavity (31) connected to its air inlet (301) and exhaust port (302), and an ammonia spraying structure (32) is provided in the air inlet channel of the SCR denitration reactor (4), and the ammonia spraying structure (32) is used to spray an ammonia solution into the exhaust gas in the air inlet channel; A rectifier (33) and a catalyst layer (34) are provided in the cavity (31); the rectifier (33) is located between the catalyst layer (34) and the air inlet channel; the rectifier (33) is used to rectify the fluid flowing out of the air inlet channel and introduce the rectified fluid into the catalyst layer (34), so that the rectified fluid undergoes a chemical reaction under the action of the catalyst layer (34) to perform denitration treatment on the exhaust gas.

7. The carbon fiber processing waste gas emission incineration system according to any one of claims 1 to 3, characterized in that: The pipeline connections at both the air inlet (301) and the exhaust port (302) of the SCR denitration reactor (4) are flexible connections.

8. The carbon fiber processing waste gas emission incineration system according to any one of claims 1 to 3, characterized in that: It also includes a heat exchanger (5), the heat exchanger (5) having a first heat exchange channel (406) and a second heat exchange channel (405) capable of performing heat exchange, the first heat exchange channel (406) being used to be connected to the exhaust port (302) of the SCR denitration reactor (4); The second heat exchange channel (405) is used to be connected to the fresh air channel of the oxidation furnace in the carbon fiber processing system and / or to the fresh air channel of the drying furnace in the carbon fiber processing system.

9. The carbon fiber processing waste gas emission incineration system according to claim 8, characterized in that: The heat exchanger (5) comprises a shell (42), a first partition plate (47) and a second partition plate (48) are arranged inside the shell (42), the first partition plate (47) and the second partition plate (48) are both sealed with the inner wall of the shell (42) along the circumferential direction, and the space inside the shell (42) between the first partition plate (47) and the second partition plate (48) forms the first heat exchange channel (406); The shell (42) has a first connector (41) at one end close to the first partition plate (47), and has a second connector (46) at one end close to the second partition plate (48); the heat exchanger (5) also has a heat exchange tube (44), the heat exchange tube (44) passes through the first heat exchange channel (406), one end of the heat exchange tube (44) is mounted on the first partition plate (47) and communicates with the inside of the first connector (41); the other end of the heat exchange tube (44) is mounted on the second partition plate (48) and communicates with the inside of the second connector (46); the second heat exchange channel (405) is formed inside the heat exchange tube (44); the second heat exchange channel (405) is connected to the fresh air channel of the oxidation furnace in the carbon fiber processing system and / or the fresh air channel of the drying furnace in the carbon fiber processing system through the first connector (41) and the second connector (46); A baffle (43) is also provided in the first heat exchange channel (406), and the baffle (43) is used to change the flow direction of the fluid in the first heat exchange channel (406); The shell (42) is also provided with a liquid discharge port (45) which is in communication with the first heat exchange channel (406).

10. The carbon fiber processing waste gas emission incineration system according to claim 8, characterized in that: An end of the first heat exchange channel (406) facing away from the SCR denitration reactor (4) is connected to an exhaust pipe; Wherein, a dust collector (6) is provided on the exhaust duct, and the dust collector (6) is used to remove dust from the gas flowing through the exhaust duct; and / or, a third fan (7) is provided on the exhaust duct, and the third fan (7) is a variable frequency fan.

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