Organic waste gas adsorption and regeneration method

Abstract

The invention discloses an organic waste gas adsorption and regeneration method, which belongs to the technical field of industrial waste gas treatment and recycling, and comprises the following steps: collecting mixed waste gas generated in the industry through a waste gas introduction pipeline, and removing particulate matters in the mixed waste gas through a dry filter; then, the organic waste gas in the mixed gas is adsorbed and collected by using activated carbon fibers in the parallel activated carbon adsorption towers; after activated carbon fibers in the parallel activated carbon adsorption towers are adsorbed to a preset amount, nitrogen is introduced into the parallel activated carbon adsorption towers through a nitrogen introduction mechanism, the concentration and temperature of the nitrogen in the parallel activated carbon adsorption towers are controlled by using a hot air blowing mechanism, and desorbed organic waste gas is recycled by using a desorption collection tank; and after the organic waste gas is adsorbed on the mixed air, the nitrogen subjected to desorption treatment can be directly discharged by the discharge structure. The technical problem of how to improve the adsorption and regeneration efficiency of the organic waste gas is solved.

Description

Technical Field

[0001] The invention relates to the technical field of industrial waste gas treatment and resource utilization, and in particular to an organic waste gas adsorption and regeneration method. Background Art

[0002] The electronics industry is one of the fastest-growing industries in the world today. Due to the rapid iteration and update of production processes and the large demand for product exports, many countries use it as a benchmark for absorbing high-tech and developing traditional industrial technologies.

[0003] With the rapid development of the modern electronics industry, more and more pollutants are generated. The organic solvents used by companies in the electronics industry not only cause VOCs to volatilize, but also produce hazardous waste. In addition, when using electronic products, some components are often prone to emitting VOCs under high temperature conditions.

[0004] Specifically, unlike traditional processing and manufacturing industries, VOCs emissions in the electronics industry have the following characteristics: (1) The use of solvents is not easy to detect: The use of solvents in the electronics industry is concentrated in the coating of the shell and frame. The VOCs emissions in this process are not easy to attract people's attention because it is not an important component of electronic products; (2) The size of electronic products is small: Because electronic products are small in size, their spraying area is relatively small compared with furniture manufacturing and machinery manufacturing; (3) The electronics industry has a large production scale: its products are generally medium-to-high-end electronic products with high production technology, so manufacturers capable of producing products have a certain production scale; (4) The exhaust gas emitted by the electronics industry contains VOCs with complex components, large air volume, and low concentration, making it difficult to treat. The above characteristics make it easy for the electronics industry to be overlooked as a source of VOCs emissions.

[0005] Based on this, Chinese patent CN105381688B discloses an adsorption device for concentrating organic waste gas and a method for concentrating waste gas; in the technical solution disclosed in the patent, the lower section of the box is a lower liquid pool, the liquid inlet is connected to the high-pressure pump and the liquid adsorbent storage tank in turn, the liquid outlet is connected to the desorption tower, the circulating liquid outlet at the lower part of the lower liquid pool is connected to the circulating liquid inlet at the top of the box through the circulating pump, a baffle is fixed on the side wall of the upper section of the box, a plurality of through holes are evenly opened on the baffle, and the range of the through holes corresponds to the position of the adsorption working area in the waste gas adsorption chamber below the baffle, a membrane tube assembly is provided in the adsorption working area, several membrane tubes are vertically fixed in the bracket, and the two opposite sides of the bracket are respectively the air inlet surface and the air outlet surface, the air inlet surface is sealed and connected to the air inlet of the box, the air outlet surface is connected to the defogging area, the membrane tube is a porous hollow fiber membrane tube, the defogging area is provided with a defogging baffle, and the air outlet is provided on the side wall of the box at the top of the defogging area. Therefore, this technical solution has the advantages of low cost, energy saving and high efficiency, and convenient operation.

[0006] However, the above-disclosed adsorption device for concentrating organic waste gas still has the technical problem of low adsorption efficiency. Specifically, the above-disclosed adsorption device for concentrating organic waste gas is mainly based on adsorption technology, which is mainly a method of treating VOCs using solvents. VOCs are first absorbed in the solvent, and then the VOCs can be separated and treated according to the different properties between VOCs and the solvent. The absorption process can be divided into physical absorption and chemical absorption, but most of the absorption methods for VOCs belong to physical absorption. This method is suitable for treating VOCs with the characteristics of high concentration, low temperature and high pressure. In addition to having good solubility for VOCs, the absorbent used to treat VOCs also needs to have good desorption ability and stable chemical properties. The absorption effect of VOCs is not only related to the absorption performance of the absorbent, but also closely related to the structural structure of the absorption equipment. At present, the method of using solvents to absorb and recover waste gas requires the replacement or treatment of the solvent at a certain time point, which is time-consuming, labor-intensive, and difficult to control the cost. Therefore, in the current technical field of industrial waste gas treatment and resource utilization, there is an urgent need for a method for recovering waste gas that has both high adsorption efficiency and can further control costs. Summary of the invention

[0007] Based on this, it is necessary to provide an organic waste gas adsorption and regeneration method to address the technical problem of how to improve the organic waste gas adsorption and regeneration efficiency.

[0008] An organic waste gas adsorption and regeneration method comprises: S1: a mixed gas to be treated flows from a waste gas inlet pipe into a dry filter, and the dry filter filters and intercepts particulate matter in the mixed gas; S2: The mixed gas flowing out of the dry filter enters from the top of the parallel activated carbon adsorption tower, and the parallel activated carbon adsorption tower adsorbs the organic waste gas in the mixed gas; S3: While the parallel activated carbon adsorption tower adsorbs the organic waste gas, the hot air blowing mechanism generates hot air and enters the parallel activated carbon adsorption tower from the top, thereby controlling the concentration of the organic waste gas in the parallel activated carbon adsorption tower, the flow rate of the mixed gas and the temperature of the internal environment of the parallel activated carbon adsorption tower; the mixed gas after the organic waste gas is adsorbed and removed is discharged from the discharge structure; S4: After the mixed gas stays in the parallel activated carbon adsorption tower for a preset time, the nitrogen introduction mechanism is started and nitrogen is blown into the parallel activated carbon adsorption tower; S5: Nitrogen with a preset flow rate and temperature can adsorb and desorb the volatile organic gas in the activated carbon fiber in the parallel activated carbon adsorption tower, and then enter the desorption collection tank; S6: In the desorption collection tank, nitrogen and organic gas can be cooled simultaneously, and the organic gas can be condensed into a solvent and flow into the recovery bin in the desorption collection tank, while the cooled nitrogen can be discharged into the atmosphere through the discharge structure.

[0009] Furthermore, the adsorption medium filled in the parallel activated carbon adsorption tower is sisal-based activated carbon fiber.

[0010] Furthermore, the activated carbon fibers filled in the parallel activated carbon adsorption tower are modified by secondary heating or inorganic salt impregnation before use.

[0011] Furthermore, the activated carbon fibers filled in the parallel activated carbon adsorption tower were impregnated and modified with a K2SO4 solution with a mass fraction of 0.05% before use.

[0012] Furthermore, the gas flow rate of the mixed gas flowing out of the dry filter into the parallel activated carbon adsorption tower is controlled to be 0.03m / s to 0.06m / s.

[0013] Furthermore, the gas flow rate of the mixed gas flowing out of the dry filter into the parallel activated carbon adsorption tower is controlled to be 0.04 m / s.

[0014] Furthermore, the temperature of the internal environment of the parallel activated carbon adsorption tower is controlled to be 25±3°C.

[0015] Furthermore, when the nitrogen introduction mechanism blows nitrogen into the parallel activated carbon adsorption tower, the temperature inside the parallel activated carbon adsorption tower is controlled to be 60-80°C through the hot air blowing mechanism.

[0016] Furthermore, when the nitrogen introduction mechanism blows nitrogen into the parallel activated carbon adsorption tower, the blowing flow rate of the nitrogen is controlled to be 0.06 m / s to 0.09 m / s.

[0017] Furthermore, when the nitrogen introduction mechanism blows nitrogen into the parallel activated carbon adsorption tower, the blowing flow rate of the nitrogen is controlled to be 0.08 m / s.

[0018] In summary, in the method for adsorbing and regenerating organic waste gas of the present invention, the mixed waste gas generated by the industry is first collected through the waste gas introduction pipeline, and the particulate matter therein is removed through a dry filter; then, the activated carbon fiber in the parallel activated carbon adsorption tower is used to adsorb and collect the organic waste gas in the mixed gas; after the activated carbon fiber in the parallel activated carbon adsorption tower is adsorbed to a preset amount, nitrogen is introduced into it through a nitrogen introduction mechanism, and a hot air blowing mechanism is used to control the nitrogen concentration and temperature in the parallel activated carbon adsorption tower, and the desorption collection tank is used to recycle the desorbed organic waste gas; and the nitrogen in the mixed air after adsorbing the organic waste gas and completing the desorption treatment can be directly discharged by the discharge structure. In the method for adsorbing and regenerating organic waste gas of the present invention, the activated carbon fiber still has a good adsorption capacity after multiple desorption and regeneration, and can be reused; it avoids the situation that the solvent needs to be frequently replaced when the prior art uses a medium such as a solvent for adsorption, and can achieve the technical effect of reducing costs and increasing efficiency; therefore, the method for adsorbing and regenerating organic waste gas of the present invention solves the technical problem of how to improve the adsorption and regeneration efficiency of organic waste gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of an organic waste gas adsorption and regeneration device of the present invention; Figure 2 This is a schematic structural diagram of a partial structure of another direction of an organic waste gas adsorption and regeneration device of the present invention. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0025] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0026] Please also read Figure 1 to Figure 2, an organic waste gas adsorption and regeneration device, comprising: a waste gas introduction pipe 1, a dry filter 2, a parallel activated carbon adsorption tower 3, a desorption collection tank 4, a nitrogen introduction mechanism 5, a hot air blowing mechanism 6 and a discharge structure 7; the waste gas introduction pipe 1 is connected to the dry filter 2, the parallel activated carbon adsorption tower 3 is connected to the dry filter 2, the desorption collection tank 4 is arranged at the bottom of the parallel activated carbon adsorption tower 3, the nitrogen introduction mechanism 5 is connected to the parallel activated carbon adsorption tower 3, and the hot air blowing mechanism 6 is connected to the parallel activated carbon adsorption tower 3; the discharge structure 7 is respectively connected to the parallel activated carbon adsorption tower 3 and the desorption collection tank 4.

[0027] Specifically, a method for applying the aforementioned organic waste gas adsorption and regeneration device comprises the following steps: S1: The mixed gas to be treated flows from the exhaust gas inlet pipe 1 into the dry filter 2, and the dry filter 2 filters and intercepts the particulate matter in the mixed gas; S2: The mixed gas flowing out of the dry filter 2 enters from the top of the parallel activated carbon adsorption tower 3, and the parallel activated carbon adsorption tower 3 adsorbs the organic waste gas in the mixed gas; S3: While the parallel activated carbon adsorption tower 3 adsorbs the organic waste gas, the hot air blowing mechanism 6 generates hot air and enters the parallel activated carbon adsorption tower 3 from the top, thereby controlling the concentration of the organic waste gas in the parallel activated carbon adsorption tower 3, the flow rate of the mixed gas and the temperature of the internal environment of the parallel activated carbon adsorption tower 3; the mixed gas after the adsorbed organic waste gas can be discharged from the discharge structure 7; S4: After the mixed gas stays in the parallel activated carbon adsorption tower 3 for a preset time, the nitrogen introduction mechanism 5 is started and nitrogen is blown into the parallel activated carbon adsorption tower 3; S5: The nitrogen gas at the preset flow meter temperature can adsorb and desorb the volatile organic gas in the activated carbon fiber in the parallel activated carbon adsorption tower 3, and then enter the desorption collection tank 4; S6: The nitrogen and the organic gas can be cooled simultaneously in the desorption collection tank 4, and the organic gas is condensed into a solvent and flows into the recovery bin in the desorption collection tank 4, while the cooled nitrogen can be discharged into the atmosphere through the discharge structure 7.

[0028] It can be seen that the organic waste gas adsorption and regeneration method of the present invention provides a method for adsorbing and separating organic waste gas in a mixed gas by utilizing the adsorption capacity of activated carbon, and can make the separated organic waste gas form a solvent and be regenerated. Since the micropores on the activated carbon fiber account for more than 90%, the organic molecules adsorbed by the activated carbon fiber are difficult to desorb, which affects the regeneration and use of the activated carbon fiber. If the activated carbon fiber that has been saturated with adsorption is directly discarded as garbage, it will also waste resources; at the same time, it will also cause pollution to the environment. Therefore, in order to increase the number of times the activated carbon fiber is used and improve the processing capacity of the adsorption device, and further control the cost of industrial waste gas treatment, desorption and regeneration of activated carbon fibers is an effective method.

[0029] The adsorption capacity of activated carbon fiber is greatly affected by the specific surface area. This is because there are many adsorption sites on the surface of activated carbon fiber. The increase in specific surface area will provide more adsorption sites for VOCs. The proportion of micropores on activated carbon fiber exceeds 90%, and most activated carbon fibers generally have a specific surface area of ​​10002500 / g. Activated carbon fibers prepared by different materials and technologies also have certain differences in specific surface area; in a method for adsorbing and regenerating organic waste gas of the present invention, sisal-based activated carbon fiber can be used as the adsorption substrate in the parallel activated carbon adsorption tower 3, and its surface area is 1970m 2 / g, the adsorption capacity of organic waste gas can be optimal, for example, the adsorption capacity of toluene and benzene can reach 763 and 490 mg / g.

[0030] Furthermore, even activated carbon fibers with similar pore structures can have significant differences in adsorption capacity. One of the factors that causes this is that the types and quantities of functional groups or ions on the surface of activated carbon fibers are different. This makes the adsorption efficiency of activated carbon fibers different when they come into contact with different volatile organic gases. Although these functional groups can only represent a small part of the specific surface area, and there are some small differences in their respective chemical properties, they have a great influence on the performance of activated carbon fibers in terms of adsorption capacity. Therefore, in a method for adsorbing and regenerating organic waste gas of the present invention, the functional groups on the surface of activated carbon fibers can be regulated by a modification method. The specific method of modification is secondary heating or impregnation with inorganic salts. For example, the temperature of secondary heating can be controlled to be 60°C to 80°C, and the heating time can be controlled to be 1h to 8h; in addition, a K2SO4 solution with a mass fraction of 0.05% can be used to impregnate and modify the activated carbon fibers.

[0031] Further, under the same other conditions, the greater the VOCs concentration at the inlet of the parallel activated carbon adsorption tower 3, the easier it is to penetrate the activated carbon fiber layer placed in the parallel activated carbon adsorption tower 3, and the greater the equilibrium adsorption amount of volatile organic waste gas by the activated carbon fiber. In addition, the greater the VOCs concentration at the inlet of the parallel activated carbon adsorption tower 3, and when the penetration rate obtained by the experiment is 50%, the greater the slope on the corresponding penetration curve, which indicates that the adsorption mass transfer in the parallel activated carbon adsorption tower 3, that is, the rate of the activated carbon fiber, is faster, that is, the easier it is for the activated carbon fiber to adsorb VOCs to reach adsorption saturation equilibrium, and the shorter the adsorption saturation time. In other words, the activated carbon fiber in the parallel activated carbon adsorption tower 3, especially the sisal-based activated carbon fiber, has a good adsorption effect on treating low-concentration volatile organic waste gas generated by the electronics industry.

[0032] Furthermore, at the inlet of the parallel activated carbon adsorption tower 3, as the intake air flow rate of the mixed gas increases, the equilibrium adsorption amount of VOCs by the activated carbon fiber decreases, the steeper the penetration curve, the easier it is to penetrate the activated carbon fiber layer, the greater the slope on the corresponding penetration curve when the penetration rate is 50%, and the shorter the time for the activated carbon fiber to adsorb VOCs to reach adsorption saturation equilibrium. Specifically, the slope of the penetration curve at intake air flow rates of 300L / h and 500L / h is not much different, and the time to reach adsorption saturation equilibrium is also not much different, while the penetration time at an intake air flow rate of 100L / h is significantly longer, and the time for adsorption saturation equilibrium is longer. Therefore, in the adsorption treatment of volatile organic waste gas, the gas flow rate of the mixed gas can be controlled to be 0.03m / s to 0.06m / s, and the optimal gas flow rate is 0.04m / s; while ensuring the adsorption rate, it can be more fully adsorbed, which is more conducive to the adsorption treatment of activated carbon fiber.

[0033] Furthermore, as the inlet temperature increases, the equilibrium adsorption amount of volatile organic gases by the activated carbon fibers in the parallel activated carbon adsorption tower 3 gradually decreases. The steeper the penetration curve is as the temperature increases, the easier it is for the activated carbon fiber layer to be penetrated. When the penetration rate is 50%, the greater the slope on the corresponding penetration curve is, the shorter the time it takes for the activated carbon fibers to adsorb VOCs to reach adsorption saturation equilibrium. At 25°C, the equilibrium adsorption amount of volatile organic gases adsorbed by the activated carbon fibers is large and the adsorption saturation time is short, so when adsorbing and treating organic waste gas, try to keep the room temperature at around 25°C, and control the temperature deviation within ±3°C.

[0034] Furthermore, in the desorption stage, the nitrogen temperature has a greater impact on the desorption effect. When the nitrogen temperature is 40°C, the desorption rate is the lowest, and it is difficult for volatile organic compounds to be desorbed from the activated carbon fiber; when the nitrogen temperature is 60°C and 80°C, the desorption rate is high and the desorption effect is relatively good; when the nitrogen temperature is 100°C, the desorption rate is not high. From the perspective of industrial-scale application, 60°C is a suitable desorption temperature, which can take into account both the desorption rate and energy saving.

[0035] Furthermore, as the nitrogen flow rate increases, the desorption rate increases, the desorption rate is faster, and the desorption time is shortened. During desorption, the nitrogen flow rate is 0.06m / s to 0.09m / s, and the desorption efficiency is the highest. The optimal desorption efficiency is when the nitrogen concentration is controlled at 0.08m / s.

[0036] Furthermore, in the desorption collection tank 4, at the same condensation inlet concentration, the lower the condensation temperature, the higher the condensation recovery rate. From the perspective of energy saving, the optimal condensation temperature is -15°C; at the same condensation temperature, the higher the condensation inlet concentration, the higher the condensation recovery rate; when the condensation inlet concentration is 2500 mg / m 3 Even if the condensation temperature is low, the condensation recovery rate is not high, indicating that the condensation inlet concentration is too low and not easy to recover.

[0037] Furthermore, the equilibrium adsorption capacity of the activated carbon fiber after regeneration in the parallel activated carbon adsorption tower 3 does not change much. After 7 repeated regenerations, the adsorption capacity of volatile organic gases by the activated carbon fiber is slightly reduced, but the rate of decrease is very slow. It can be seen that in the method for adsorbing and regenerating organic waste gas of the present invention, the activated carbon fiber still has a good adsorption capacity after multiple desorption and regeneration, and can be reused. This avoids the situation in which the prior art uses solvents and other media for adsorption, which requires frequent replacement of solvents, and can achieve the technical effect of reducing costs and increasing efficiency.

[0038] In summary, in an organic waste gas adsorption and regeneration method of the present invention, the mixed waste gas generated by the industry is first collected through the waste gas introduction pipe 1, and then the particulate matter therein is removed through the dry filter 2; then, the activated carbon fiber in the parallel activated carbon adsorption tower 3 is used to adsorb and collect the organic waste gas in the mixed gas; after the activated carbon fiber in the parallel activated carbon adsorption tower 3 is adsorbed to a preset amount, nitrogen is introduced into it through the nitrogen introduction mechanism 5, and the hot air blowing mechanism 6 is used to control the nitrogen concentration and temperature in the parallel activated carbon adsorption tower 3, and the desorption collection tank 4 is used to recover the desorbed organic waste gas; and the nitrogen in the mixed air after the organic waste gas is adsorbed and the desorption treatment is completed can be directly discharged by the discharge structure 7. In the method for adsorbing and regenerating organic waste gas of the present invention, the activated carbon fiber still has good adsorption capacity after multiple desorption and regeneration, and can be reused; it avoids the situation in which the prior art uses solvents and other media for adsorption, and the solvent needs to be frequently replaced, and the technical effect of reducing costs and increasing efficiency can be achieved; therefore, the method for adsorbing and regenerating organic waste gas of the present invention solves the technical problem of how to improve the adsorption and regeneration efficiency of organic waste gas.

[0039] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for adsorbing and regenerating organic waste gas, It is characterized in that It includes the following steps: S1: The mixed gas to be treated flows into the dry filter from the exhaust gas inlet pipe, and the dry filter filters and intercepts the particulate matter in the mixed gas; S2: The mixed gas flowing out of the dry filter enters from the top of the parallel activated carbon adsorption tower, and the parallel activated carbon adsorption tower adsorbs the organic waste gas in the mixed gas; S3: While the parallel activated carbon adsorption tower is adsorbing the organic waste gas, the hot air blowing mechanism generates hot air and enters the parallel activated carbon adsorption tower from the top. Then the concentration of organic waste gas in the parallel activated carbon adsorption tower, the flow rate of the mixed gas and the temperature of the internal environment of the parallel activated carbon adsorption tower are controlled; the mixed gas after the organic waste gas is adsorbed and removed is discharged from the discharge structure; S4: After the mixed gas stays in the parallel activated carbon adsorption tower for a preset time, the nitrogen introduction mechanism is started and nitrogen is blown into the parallel activated carbon adsorption tower; S5: Nitrogen with a preset flow rate and temperature can adsorb and desorb the volatile organic gas in the activated carbon fiber in the parallel activated carbon adsorption tower, and then enter the desorption collection tank; S6: In the desorption collection tank, nitrogen and organic gas can be cooled simultaneously, and the organic gas can be condensed into a solvent and flow into the recovery bin in the desorption collection tank, while the cooled nitrogen can be discharged into the atmosphere through the discharge structure.

2. The method for adsorbing and regenerating organic waste gas according to claim 1, Features: The adsorption medium filled in the parallel activated carbon adsorption tower is sisal-based activated carbon fiber.

3. The method for adsorbing and regenerating organic waste gas according to claim 1, Features: The activated carbon fibers filled in the parallel activated carbon adsorption tower are modified by secondary heating or inorganic salt impregnation before use.

4. The method for adsorbing and regenerating organic waste gas according to claim 3, Features: The activated carbon fibers filled in the parallel activated carbon adsorption tower were treated with K with a mass fraction of 0.05% before use. 2 SO 4 Solution is used for impregnation modification.

5. The method for adsorbing and regenerating organic waste gas according to claim 1, Features: The gas flow rate of the mixed gas flowing out of the dry filter into the parallel activated carbon adsorption tower is controlled to be 0.03m / s to 0.06m / s.

6. The method for adsorbing and regenerating organic waste gas according to claim 5, Features: The gas flow rate of the mixed gas flowing out of the dry filter into the parallel activated carbon adsorption tower is controlled to be 0.04m / s.

7. The method for adsorbing and regenerating organic waste gas according to claim 1, Features: The temperature of the internal environment of the parallel activated carbon adsorption tower is controlled at 25±3℃.

8. The method for adsorbing and regenerating organic waste gas according to claim 1, Features: When the nitrogen introduction mechanism blows nitrogen into the parallel activated carbon adsorption tower, the temperature inside the parallel activated carbon adsorption tower is controlled to be 60-80°C through the hot air blowing mechanism.

9. The method for adsorbing and regenerating organic waste gas according to claim 1, Features: When the nitrogen introduction mechanism blows nitrogen into the parallel activated carbon adsorption tower, the blowing flow rate of the nitrogen is controlled to be 0.06m / s to 0.09m / s.

10. The method for adsorbing and regenerating organic waste gas according to claim 9, Features: When the nitrogen introduction mechanism blows nitrogen into the parallel activated carbon adsorption tower, the blowing flow rate of nitrogen is controlled to be 0.08m / s.

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