Oxidized tail gas tar removal system in carbon fiber production and carbon fiber production system

Abstract

The utility model relates to an oxidized tail gas tar removal system in carbon fiber production and a carbon fiber production system. The oxidized tail gas tar removal system in the carbon fiber production comprises a heat exchanger, the upper part of which is provided with a tail gas inlet and an exhaust port, the lower part of which is provided with a gaseous cooling medium inlet, and the bottom of which is provided with a material outlet; and the gas-liquid separation mechanism is communicated with the material outlet, and the gas-liquid separation mechanism is positioned below the heat exchanger. According to the utility model, the gaseous cooling medium entering the heat exchanger escapes upwards and exchanges heat with the to-be-treated tail gas with higher temperature, so that the temperature of the tail gas is reduced, tar in the tail gas is condensed after being cooled, and the tar is removed from the tail gas; then, the tar carrying part of the tail gas enters the gas-liquid separation mechanism through the material outlet under the action of gravity, gas gradually floats upwards, the tar sinks to the bottom, then gas-liquid separation is achieved, and the carried tail gas is further removed from the tar.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical equipment, and in particular relates to a system for removing tar from oxidation tail gas in carbon fiber production and a carbon fiber production system. Background Art

[0002] Carbon fiber refers to fibers with a carbon content of over 90%, meaning they are primarily composed of carbon. Carbon fiber boasts low density, high strength, high modulus, low elongation, high-temperature resistance, friction resistance, corrosion resistance, high wear resistance, electrical conductivity, thermal conductivity, and fatigue resistance. Its fibrous appearance allows it to be used directly as a filter material for corrosion-resistant gases, high-temperature filters for liquids, high-temperature insulation, catalyst carriers, and static eliminators. It is widely used in aviation, aerospace, automotive, electronics, machinery, textile machinery, medical equipment, stationery and sports supplies, building materials, bioengineering, chemical machinery, and transportation vehicles.

[0003] There are four main methods for producing carbon fiber: the organic precursor method, which involves spinning polyacrylonitrile into precursor fibers, followed by oxidation, low-temperature carbonization, and high-temperature carbonization; the centrifugal spinning method; the melt-blowing method, which is used to spin pitch- and phenolic-based carbon fibers; and the chemical vapor deposition method, which is used to produce carbon whiskers. Among them, polyacrylonitrile precursor fibers can produce high-performance carbon fibers. This method is simple to manufacture and offers excellent mechanical properties, making it the mainstream method for carbon fiber production.

[0004] However, the oxidation, low-temperature carbonization, and high-temperature carbonization processes generate a large amount of exhaust gas. It is estimated that every ton of carbon fiber produced generates 1 ton of exhaust gas, containing 200-300kg of tar. During the exhaust process, the tar and other impurities contained in these exhaust gases will be deposited in the pipelines, and if not cleaned in time, they will clog the pipelines. Utility Model Content

[0005] In view of this, the utility model provides a tar removal system for oxidized tail gas in carbon fiber production and a carbon fiber production system to solve the problem that tar-containing tail gas will be generated during the above-mentioned oxidation, low-temperature carbonization, high-temperature carbonization and other processes. It is estimated that 1 t of tail gas will be generated for every 1 t of carbon fiber produced, which contains 200-300 kg of tar. During the emission process of these tail gases, the tar and other impurities contained in them will be deposited in the pipeline. If they are not cleaned in time, they will also clog the pipeline and other technical problems.

[0006] In order to realize the above scheme, the technical solution of the present utility model is as follows:

[0007] In a first aspect, the present invention provides a tail gas tar removal system, the tail gas tar removal system comprising:

[0008] A heat exchanger having an exhaust gas inlet and exhaust port at the top, a gaseous cooling medium inlet at the bottom, and a material outlet at the bottom; and

[0009] The gas-liquid separation mechanism is connected to the material outlet and is located below the heat exchanger.

[0010] The principle of the tail gas tar removal system of the present invention is as follows: by adding a tail gas inlet at the upper part of the heat exchanger, a gaseous cooling medium (such as cold air) can be introduced into the heat exchanger through the gaseous cooling medium inlet, and the oxidation tail gas containing tar and a higher temperature in the carbon fiber production is introduced into the heat exchanger through the tail gas inlet, and the gaseous cooling medium (such as cold air) entering the heat exchanger gradually escapes upward and exchanges heat with the tail gas containing tar and a higher temperature entering the heat exchanger, thereby reducing the temperature of the tail gas, and the tar in the tail gas condenses after cooling, so that the tar is removed from the tail gas; then the tar entrained with part of the tail gas enters the gas-liquid separation mechanism through the material outlet under the action of gravity, and in the gas-liquid separation mechanism, the gas gradually floats up and the tar sinks to the bottom, thereby realizing gas-liquid separation, and further removing the entrained tail gas from the tar.

[0011] Optionally, the tail gas tar removal system further includes a tar storage container, and the gas-liquid separation mechanism is provided with a tar outlet, which is connected to the tar storage container.

[0012] Optionally, the tail gas tar removal system further includes a gas buffer container, and the gas buffer container is connected to the tail gas inlet.

[0013] Specifically, the utility model can reduce the fluctuation of the flow rate of the carbon fiber exhaust gas entering the heat exchanger by adding a gas buffer container connected to the exhaust gas inlet, ensure pressure stability, and thus improve production stability.

[0014] Optionally, the gas buffer container is provided with a pressure gauge.

[0015] Specifically, the utility model adds a pressure gauge to the gas buffer container, which can further ensure the stability of the pressure of the carbon fiber tail gas entering the heat exchanger through the pressure gauge, thereby further improving the stability of production.

[0016] Optionally, an induced draft fan is provided on the communication pipe between the gas buffer container and the tail gas inlet.

[0017] Optionally, a pressure control valve is provided on the communication pipe between the gas buffer container and the induced draft fan.

[0018] Specifically, the utility model can ensure that the pressure in the gas buffer container is at a constant level by adding a pressure control valve on the connecting pipe between the gas buffer container and the induced draft fan, thereby ensuring the stability of the carbon fiber exhaust gas pressure entering the heat exchanger, thereby further improving the stability of production.

[0019] Optionally, a waste gas outlet is provided on the upper portion of the gas-liquid separation mechanism, and the tail gas tar removal system further includes an ammonia absorption tower and / or a hydrogen cyanide absorption tower, and the ammonia absorption tower and / or the hydrogen cyanide absorption tower are connected to the waste gas outlet.

[0020] Specifically, the utility model can recover ammonia and / or hydrogen cyanide in the tail gas after tar removal through the ammonia absorption tower and / or hydrogen cyanide absorption tower connected to the exhaust gas outlet, thereby further purifying the tail gas.

[0021] In a second aspect, the present invention further provides a carbon fiber production system, which includes the tail gas tar removal system as described above.

[0022] Optionally, the carbon fiber production system further includes an oxidation furnace, and the oxidation furnace is connected to the exhaust port.

[0023] Specifically, the utility model connects the oxidation furnace to the exhaust port, so that the cooling medium (such as hot air) after heat exchange can be sent into the oxidation furnace, thereby making full use of the waste heat of the cooling medium (such as hot air) after heat exchange for production, improving resource utilization and reducing production costs.

[0024] Optionally, the oxidation furnace is provided with an air purifier, and the air purifier is connected to the gaseous cooling medium inlet.

[0025] Specifically, the utility model connects the air purifier to the gaseous cooling medium inlet, and can use the air purified by the air purifier as a cooling medium to detar the carbon fiber exhaust, thereby avoiding interference of harmful components in the air with the detarring process and improving the tar quality.

[0026] Optionally, a heater is provided on the communication pipe between the oxidation furnace and the exhaust port.

[0027] Specifically, the present invention heats the cooling medium after heat exchange (such as hot air, which contains part of the exhaust gas) by adding a heater to the connecting pipe between the oxidation furnace and the exhaust port, thereby better matching the temperature conditions required by the oxidation process.

[0028] Optionally, a finned tube is provided at one end of the heater close to the exhaust port, and a heat exchange tube is provided at one end of the heater close to the oxidation furnace.

[0029] Specifically, the present invention provides a finned tube at one end of the heater close to the exhaust port, thereby increasing the heat exchange area and improving the heat exchange effect.

[0030] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are incorporated into and constitute a part of the specification, illustrating embodiments consistent with the present application and, together with the specification, serving to explain the principles of the present application. It is obvious that the drawings described below are merely some embodiments of the present application, and a person of ordinary skill in the art can derive other drawings based on these drawings without inventive effort. In the drawings:

[0032] Figure 1 Schematic diagram of the structure of the tail gas tar removal system of Example 1;

[0033] Figure 2 Schematic diagram of the structure of the tail gas tar removal system of Example 2;

[0034] Figure 3 Schematic diagram of the structure of the tail gas tar removal system of Example 3;

[0035] Figure 4 This is a schematic structural diagram of the carbon fiber production system of Example 4.

[0036] Reference numerals

[0037] 1-Heat exchanger;

[0038] 2-gas-liquid separation mechanism;

[0039] 3- Tar storage container;

[0040] 4- ammonia absorption tower, 41- packing section, 42- tray section, 421- sieve plate, 43- liquid level gauge;

[0041] 5-hydrogen cyanide absorption tower;

[0042] 6-gas buffer container, 61-pressure gauge;

[0043] 7- induced draft fan;

[0044] 8-Pressure control valve

[0045] 9-Oxidation furnace;

[0046] 10- Heater. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0048] It should be noted that all directional indications (such as up, down, top, bottom, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0049] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0050] In addition, in the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "A and / or B" appearing throughout the text includes three parallel solutions, and "A and / or B" includes solution A, solution B, or solutions that meet both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention. In the related art, the organic precursor method is used to produce carbon fiber, which includes processes such as oxidation, low-temperature carbonization, and high-temperature carbonization. Tar-containing tail gas will be generated during the oxidation, high-temperature carbonization, and low-temperature carbonization processes. It is estimated that 1 ton of tail gas will be generated for every 1 ton of carbon fiber produced, containing 200-300 kg of tar. During the exhaust gas emission process, the tar and other impurities contained in it will be deposited in the pipes. If not cleaned in time, it will clog the pipes. Based on the above problems, one embodiment of the present invention provides a tail gas tar removal system, which includes a connected heat exchanger 1, a gas-liquid separation mechanism 2, an ammonia absorption tower 4 and / or a hydrogen cyanide absorption tower 5; the upper part of the heat exchanger 1 is provided with a tail gas inlet and an exhaust port, the lower part is provided with a gaseous cooling medium inlet, and the bottom is provided with a material outlet, and the material outlet is connected to the gas-liquid separation mechanism 2; the gas-liquid separation mechanism 2 is located below the heat exchanger 1, and the gas-liquid separation mechanism 2 is provided with a waste gas outlet; the upper part of the ammonia absorption tower 4 is provided with an acid liquid feed port, and the lower part of the ammonia absorption tower 4 is provided with a waste gas inlet and a liquid phase outlet, the waste gas inlet of the ammonia absorption tower 4 is connected to the waste gas outlet of the gas-liquid separation mechanism 2, and a packing section 41 and a tower plate section 42 are provided between the acid liquid feed port and the liquid phase outlet in sequence, and the tower plate section 42 is provided with a plurality of sieve plates 421 located on the side wall from top to bottom. The ammonia absorption tower 4 is provided with a liquid level meter 43, and the liquid phase outlet is electrically connected to the liquid level meter 43;

[0051] A gas inlet is provided at the lower portion of the hydrogen cyanide absorption tower 5 , and the gas inlet of the hydrogen cyanide absorption tower 5 is connected to the ammonia absorption tower 4 .

[0052] In another embodiment of the present invention, the tail gas tar removal system further includes a tar storage container 3 , and the gas-liquid separation mechanism 2 is provided with a tar outlet, which is connected to the tar storage container 3 .

[0053] In another embodiment of the present invention, the tail gas tar removal system further includes a gas buffer container 6 and an induced draft fan 7. The gas buffer container 6 is connected to the tail gas inlet and is provided with a pressure gauge 61.

[0054] The induced draft fan 7 is located on the communication pipe between the gas buffer container 6 and the exhaust gas inlet, and a pressure control valve 8 is provided on the communication pipe between the induced draft fan 7 and the gas buffer container 6.

[0055] One embodiment of the present invention provides a carbon fiber production system, comprising the exhaust tar removal system and an oxidation furnace 9 as described above, the oxidation furnace 9 being connected to the exhaust port, the oxidation furnace 9 being provided with an air purifier, the air purifier being connected to the inlet of the gaseous cooling medium, and a heater 10 being provided on the connecting pipe between the oxidation furnace 9 and the exhaust port.

[0056] The present invention is described in detail below through specific examples. It should also be understood that the following examples are only used to specifically illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present invention fall within the scope of protection of the present invention. The specific process parameters and the like in the following examples are only examples within a suitable range, that is, those skilled in the art can make selections within a suitable range based on the description herein, and are not limited to the specific values ​​​​in the following examples.

[0057] Example 1

[0058] See also Figure 1 , Figure 1 Schematic diagram of the structure of the tail gas tar removal system shown in this embodiment. The tail gas tar removal system can be used to remove tar and other substances entrained in the oxidized tail gas during carbon fiber production.

[0059] like Figure 1 As shown, the tail gas tar removal system of this embodiment includes a heat exchanger 1, a gas-liquid separation mechanism 2, a tar storage container 3, an ammonia absorption tower 4 and a hydrogen cyanide absorption tower 5 which are connected in sequence.

[0060] Please continue reading Figure 1 The heat exchanger 1 is used as a place for heat exchange between exhaust gas and gaseous cooling medium (such as cold air). The upper part of the heat exchanger 1 is provided with an exhaust gas inlet and an exhaust port, the lower part of the heat exchanger 1 is provided with a gaseous cooling medium inlet, and the bottom of the heat exchanger 1 is provided with a material outlet. The exhaust gas to be treated (such as oxidized exhaust gas in carbon fiber production) enters the heat exchanger 1 through the upper exhaust gas inlet, and the gaseous cooling medium (such as cold air) enters the heat exchanger 1 through the lower gaseous cooling medium inlet. The gaseous cooling medium (such as cold air) entering the heat exchanger 1 gradually escapes upward and exchanges heat with the tar-containing exhaust gas to be treated with a higher temperature entering the heat exchanger 1, thereby reducing the temperature of the exhaust gas. The tar in the exhaust gas is cooled and condensed to remove the tar from the exhaust gas. The heat exchanger 1 can adopt an air-to-air heat exchanger, etc. The air-to-air heat exchanger is a prior art and will not be described here.

[0061] Please continue reading Figure 1 The gas-liquid separation mechanism 2 is used as a place for gas-liquid separation of tar entrained with some tail gas. The gas-liquid separation mechanism 2 is located below the heat exchanger 1. The upper part of the gas-liquid separation mechanism 2 is provided with a feed inlet and a waste gas outlet, and the bottom of the gas-liquid separation mechanism 2 is provided with a discharge port. After being processed by the heat exchanger 1, the tar entrained with a small amount of tail gas enters the gas-liquid separation mechanism 2 under the action of gravity. In the gas-liquid separation mechanism 2, the gas gradually floats up and the tar sinks to the bottom, thereby further separating the tar and the tail gas. The gas-liquid separation mechanism 2 can adopt a waste gas buffer tank, a gas-liquid separator, etc. The waste gas buffer tank and the gas-liquid separator are existing technologies and will not be described in detail here.

[0062] Please continue reading Figure 1 The tar storage container 3 is used as a place to store tar, and the tar storage container 3 is connected to the discharge port of the gas-liquid separation mechanism 2.

[0063] Please continue reading Figure 1 The ammonia absorption tower 4 is used as a place to remove ammonia substances in the tail gas after being treated by the gas-liquid separation mechanism 2. The upper portion of the ammonia absorption tower 4 is provided with an acid liquid feed inlet and a gas outlet. The top of the ammonia absorption tower 4 is provided with a first spray assembly (not shown), which is connected to the acid liquid feed inlet. The lower portion of the ammonia absorption tower 4 is provided with an exhaust gas inlet and a liquid phase outlet. The exhaust gas inlet of the ammonia absorption tower 4 is connected to the exhaust gas outlet of the gas-liquid separation mechanism 2. A packing section 41 and a tray section 42 are sequentially provided between the acid liquid feed inlet and the liquid phase outlet. The tray section 42 is provided with a plurality of sieve plates 421 located on the side walls from top to bottom. The ammonia absorption tower 4 is provided with a liquid level gauge 43, and the liquid phase outlet is electrically connected to the liquid level gauge 43. Within the ammonia absorption tower, ammonia and other substances contained in the tail gas react with dilute sulfuric acid and other substances entering the ammonia absorption tower 4 from the acid liquid feed inlet, thereby removing ammonia and other substances from the tail gas.

[0064] Specifically, this embodiment, by sequentially arranging a packing section 41 and a tray section 42 between the acid liquid feed port and the liquid phase outlet of the ammonia absorption tower 4, can ensure the absorption effect of the tail gas through the packing, and prevent a small amount of tar entrained in the tail gas from clogging the ammonia absorption tower 4 by a plurality of sieve plates 421 arranged from top to bottom on the side wall of the tray section 42, thereby ensuring the smooth progress of production. By configuring the ammonia absorption tower 4 to be additionally provided with a liquid level gauge 43, and electrically connecting the liquid phase outlet to the liquid level gauge 43, the liquid can be discharged in time when the liquid level in the ammonia absorption tower 4 reaches a certain level. By adding a first spray assembly to the top of the ammonia absorption tower 2 and connecting the first spray assembly to the acid liquid feed port, the contact area between substances such as dilute sulfuric acid and the tail gas generated in the oxidation process in carbon fiber production can be increased by the first spray assembly, thereby better removing substances such as ammonia from the tail gas.

[0065] Please continue reading Figure 1Hydrogen cyanide absorption tower 5 is used to remove hydrogen cyanide and other gases from the tail gas. A liquid caustic soda inlet is provided at the top of hydrogen cyanide absorption tower 5. A second spray assembly (not shown) is provided at the top of hydrogen cyanide absorption tower 5, which is connected to the liquid caustic soda inlet. A gas inlet is provided at the bottom of hydrogen cyanide absorption tower 5, which is connected to the gas outlet of ammonia absorption tower 4. Within hydrogen cyanide absorption tower 5, substances such as sodium hydroxide solution entering through the liquid caustic soda inlet react with substances such as hydrogen cyanide contained in the tail gas to produce sodium cyanide, thereby removing hydrogen cyanide from the tail gas.

[0066] Specifically, this embodiment adds a second spray assembly to the top of the hydrogen cyanide absorption tower 5 and connects the second spray assembly to the liquid alkali inlet. The second spray assembly can increase the contact area between substances such as sodium hydroxide solution and the exhaust gas generated in the oxidation process in carbon fiber production, thereby better removing substances such as hydrogen cyanide in the exhaust gas.

[0067] All of the above communicating pipes are provided with switch valves (not shown).

[0068] The principle of the tail gas tar removal system of this embodiment is as follows: by adding a tail gas inlet at the upper part of the heat exchanger 1 and adding a gaseous cooling medium inlet at the lower part of the heat exchanger 1, a gaseous cooling medium (such as cold air) can be introduced into the heat exchanger 1 through the gaseous cooling medium inlet, and the oxidation tail gas containing tar and a higher temperature in the carbon fiber production is introduced into the heat exchanger 1 through the tail gas inlet. The gaseous cooling medium entering the heat exchanger 1 gradually escapes upward and exchanges heat with the tail gas containing tar and a higher temperature entering the heater, thereby reducing the temperature of the tail gas. The tar in the tail gas condenses after cooling, and the tar is removed from the tail gas. Subsequently, the tar entrained with part of the tail gas enters the gas-liquid separation mechanism 2 through the material outlet under the action of gravity. In the gas-liquid separation mechanism 2, the gas gradually floats up and the tar sinks to the bottom, thereby realizing gas-liquid separation, and further removing the entrained tail gas from the tar.

[0069] Example 2

[0070] See also Figure 2 , Figure 2 This is a schematic structural diagram of the tail gas tar removal system shown in this embodiment.

[0071] like Figure 2 As shown, the difference between this embodiment and embodiment 1 is that the tar storage container 3 is not included.

[0072] Example 3

[0073] See also Figure 3 , Figure 3 The structural diagram of the tail gas tar removal system is shown in this embodiment.

[0074] like Figure 3 As shown, the difference between this embodiment and embodiment 1 is that it also includes a gas buffer container 6 and an induced draft fan 7, the gas buffer container 6 is connected to the exhaust gas inlet, the gas buffer container 6 is provided with a pressure gauge 61, and a switch valve (not shown) is provided on the connecting pipe between the gas buffer container 6 and the exhaust gas inlet. The gas buffer container 6 can be a gas buffer tank, etc. The gas buffer tank is a prior art and will not be described here.

[0075] Please continue reading Figure 3 The induced draft fan 7 is located on the communication pipe between the gas buffer container 6 and the exhaust gas inlet. The communication pipe between the gas buffer container 6 and the induced draft fan 7 is provided with a pressure control valve 8 and a switch valve (not shown).

[0076] Specifically, this embodiment, by adding a gas buffer container 6 connected to the exhaust gas inlet, can reduce fluctuations in the flow rate of oxidized exhaust gas entering the heat exchanger 1 during carbon fiber production, ensure pressure stability, and thus improve production stability. By configuring the gas buffer container 6 to be equipped with a pressure gauge 61, the pressure gauge 61 can further ensure the stability of the pressure of the oxidized exhaust gas entering the heat exchanger 1 during carbon fiber production, thereby further improving production stability. By adding an induced draft fan 7 to the connecting pipe between the gas buffer container 6 and the exhaust gas inlet, the exhaust gas in the gas buffer container 6 can be pumped into the heat exchanger 1 via the induced draft fan 7. By adding a pressure control valve 8 to the connecting pipe between the gas buffer container 6 and the induced draft fan 7, the pressure in the gas buffer container 6 can be ensured to be at a constant level, thereby ensuring the stability of the pressure of the oxidized exhaust gas entering the heat exchanger 1 during carbon fiber production, thereby further improving production stability.

[0077] Example 4

[0078] See also Figure 4 , Figure 4 This is a schematic structural diagram of the carbon fiber production system shown in this embodiment.

[0079] like Figure 4 As shown, the carbon fiber production system of this embodiment includes an oxidation furnace 9 and the tail gas tar removal system as shown in Example 3. The oxidation furnace 9 is connected to the exhaust port. The oxidation furnace 9 is provided with an air purifier (not shown). The air purifier is connected to the gaseous cooling medium inlet. The connecting pipe between the oxidation furnace 9 and the exhaust port and the connecting pipe between the air purifier and the gaseous cooling medium inlet are both provided with a switch valve (not shown). The connecting pipe between the oxidation furnace 9 and the exhaust port is provided with a heater 10. The end of the heater 10 near the exhaust port is provided with a finned tube (not shown). The end of the heater 10 near the oxidation furnace 9 is provided with a heat exchange tube (not shown). The air purifier can be an air blower, etc., and the heater 10 can be an air heat exchanger, etc. The air blower and the air heat exchanger are prior art and will not be described in detail here.

[0080] Specifically, this embodiment connects the oxidation furnace 9 to the exhaust port, so that the cooling medium after heat exchange (such as hot air) can be sent into the oxidation furnace 9, thereby making full use of the waste heat of the cooling medium after heat exchange (such as hot air) for production, improving resource utilization and reducing production costs. By connecting the air purifier of the oxidation furnace 9 to the gaseous cooling medium inlet, the air purified by the air purifier can be used as a cooling medium to detar the carbon fiber tail gas, thereby avoiding interference of harmful components in the air with the detarring process, thereby improving the quality of the obtained by-product tar. By adding a heater 10 to the connecting pipe between the oxidation furnace 9 and the exhaust port, the cooling medium after heat exchange (such as hot air) can be heated, thereby better matching the temperature conditions required for the oxidation process. By arranging a finned tube at one end of the heater 10 close to the exhaust port, the heat exchange area can be increased by the finned tube, thereby improving the heat exchange effect.

[0081] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. A tail gas tar removal system, characterized in that: The tail gas tar removal system includes: A heat exchanger having an exhaust gas inlet and exhaust port at the top, a gaseous cooling medium inlet at the bottom, and a material outlet at the bottom; and The gas-liquid separation mechanism is connected to the material outlet and is located below the heat exchanger.

2. The tail gas tar removal system according to claim 1, characterized in that: The tail gas tar removal system further includes a gas buffer container, which is connected to the tail gas inlet; And / or, the tar removal system further includes a tar storage container, the gas-liquid separation mechanism is provided with a tar outlet, and the tar outlet is connected to the tar storage container.

3. The tail gas tar removal system according to claim 2, characterized in that: The gas buffer container is provided with a pressure gauge.

4. The tail gas tar removal system according to claim 2, characterized in that: An induced draft fan is provided on the communication pipe between the gas buffer container and the tail gas inlet.

5. The tail gas tar removal system according to claim 4, characterized in that: A pressure control valve is provided on the communication pipeline between the gas buffer container and the induced draft fan.

6. The tail gas tar removal system according to claim 1, characterized in that: A waste gas outlet is provided on the upper portion of the gas-liquid separation mechanism. The tar removal system further comprises an ammonia absorption tower and / or a hydrogen cyanide absorption tower, and the ammonia absorption tower and / or the hydrogen cyanide absorption tower are connected to the waste gas outlet.

7. A carbon fiber production system, characterized in that: The carbon fiber production system includes the tail gas tar removal system according to any one of claims 1 to 6.

8. The carbon fiber production system according to claim 7, wherein: The carbon fiber production system further includes an oxidation furnace, which is connected to the exhaust port.

9. The carbon fiber production system according to claim 8, wherein: The oxidation furnace is provided with an air purifier, and the air purifier is connected to the gaseous cooling medium inlet.

10. The carbon fiber production system according to claim 8, wherein: A heater is provided on the communication pipe between the oxidation furnace and the exhaust port.

Images