Waste gas purification system applied to adhesive industry

Abstract

The utility model relates to a waste gas purification system applied to the adhesive industry, which comprises an adsorption device and a desorption device, and the adsorption device of the purification system is mainly used for filtering and adsorbing various harmful substances in waste gas. The desorption device of the purification system is mainly used for desorbing various harmful gases adsorbed by the adsorption material in the adsorption device. When the adsorption device is saturated, a desorption program of the desorption device is started, and zeolite in the zeolite adsorption box is an aluminum silicate salt inorganic substance, can bear the desorption airflow temperature of 200 DEG C or above, cannot be burnt and can effectively remove various harmful substances adsorbed in the zeolite, so that the adsorption function of the system is promoted to be cyclically regenerated; and the purification system is low in operation and maintenance cost and high in safety coefficient.

Description

Technical Field

[0001] The utility model relates to the field of atmospheric environmental protection management, and in particular to an exhaust gas purification system applied to the adhesive industry. Background Art

[0002] In the preparation process of adhesives, a large number of chemical substances are used, such as styrene, butyl acrylate, acrylic acid, ammonium persulfate, etc. Although the reaction process is carried out in each closed reactor, harmful gases will overflow during the feeding, unloading and vacuuming process, which need to be collected and centrally treated. The waste gas has the following main characteristics: many high-boiling point substances, low concentration, such as butyl acrylate and acrylic acid boiling point exceeding 140°C, easy adsorption and difficult desorption; serious odor, serious nuisance. Traditional treatment methods generally include adsorption treatment through two-stage activated carbon, low equipment cost and low cost, but it is necessary to frequently replace activated carbon and other adsorbents, produce a large amount of hazardous waste, high later operation and maintenance costs, and limited effect on odor treatment; activated carbon adsorption plus catalytic combustion, the process is stable and reliable, and the technology is mature, but due to the large number of high-boiling point substances and the presence of ammonia substances, desorption is difficult, activated carbon is often blocked and needs to be replaced, and activated carbon is easy to ignite, with a low safety factor; RTO direct combustion, high purification efficiency, but large equipment investment, high operation and maintenance costs, low safety.

[0003] Adhesive preparation machinery uses a large amount of various chemical substances. The chemical composition of the exhaust gas is complex and diverse, with many high-boiling point substances and ammonia substances. It is difficult to desorb and has a serious odor. Therefore, a waste gas purification equipment is needed that can efficiently adsorb and desorb, has low operation and maintenance costs, and has a high safety factor. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of the utility model is to provide an exhaust gas purification system for the adhesive industry. The system can effectively treat the exhaust gas in the adhesive industry, and can also make the system easy to desorb and catalyze regeneration, with low operation and maintenance costs and high safety factors.

[0005] In order to achieve the purpose of the utility model, the utility model provides an exhaust gas purification system for the adhesive industry, including the following characteristics: comprising an adsorption device and a desorption device, the adsorption device comprising a multi-stage high-efficiency dry filter, a zeolite adsorption box, a main air duct, and a system fan, the multi-stage high-efficiency dry filter, the zeolite adsorption box, the main air duct, and the system fan are connected in sequence, and the connection direction from the multi-stage high-efficiency dry filter to the system fan is the airflow direction of the adsorption device in the purification system,

[0006] The desorption device includes a desorption fan, a catalytic bed, a supplementary cooling fan, a zeolite adsorption box, a cooling air outlet pipe, and a desorption air inlet pipe. One end of the catalytic bed is connected to the cooling air outlet pipe, and the other end is connected to the desorption air inlet pipe. The desorption fan is between the desorption air inlet pipe and the catalytic bed, and the other end of the cooling air outlet pipe is connected to the zeolite adsorption box. The supplementary cooling fan is between the cooling air outlet pipe and the zeolite adsorption box, and the other end of the desorption air inlet pipe is connected to the zeolite adsorption box.

[0007] In some embodiments of the utility model, the adsorption device also includes a primary acid washing spray tower, an air duct, a secondary alkali washing spray tower, an air duct, a fire damper, a chimney tower, and a chimney.

[0008] In some embodiments of the utility model, the air inlet of the first air duct is located at the top of the first-level acid washing spray tower, the air outlet of the first air duct is located at the bottom of the side of the second-level alkali washing spray tower, the air inlet of the second air duct is located at the top of the second-level alkali washing spray tower, and the other end of the second air duct is connected to the top of the multi-stage high-efficiency dry filter.

[0009] In some embodiments of the present utility model, the fire damper is connected between the multi-stage high-efficiency dry filter and the zeolite adsorption box.

[0010] In some embodiments of the present invention, the chimney is connected to a system fan, and the chimney tower is fixed on the outer periphery of the chimney.

[0011] In some embodiments of the present invention, the zeolite adsorption box is a multi-stage zeolite adsorption box, and the zeolite adsorbents in the multi-stage zeolite adsorption box are arranged and combined in sequence.

[0012] In some embodiments of the utility model, a protective shell is provided outside the zeolite adsorption box, and the shell of the zeolite adsorption box is respectively connected to the main air duct, the cooling air outlet duct, and the desorption air inlet duct.

[0013] In some embodiments of the present invention, the desorption air inlet pipe is located at the bottom of the zeolite adsorption box and is connected to the zeolite adsorption box.

[0014] In some embodiments of the present invention, the cooling air outlet pipe is located at the top of the zeolite adsorption box and is connected to the zeolite adsorption box.

[0015] In some embodiments of the utility model, the catalytic bed and the desorption fan are arranged in the same cavity, the catalytic bed is at the top of the cavity, the cooling air outlet duct passes through the top of the cavity and is connected to the catalytic bed, and the desorption fan is in a pipe extending downward from the catalytic bed, the bottom of the pipe extends downward in the cavity, and the bottom of the pipe is connected to the desorption air inlet duct.

[0016] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0017] The zeolite adsorbent of the utility model can effectively adsorb and remove various harmful substances. At the same time, since zeolite is an inorganic substance of aluminum silicate, it can withstand a desorption airflow temperature of up to 200°C and will not burn. It can effectively remove various harmful substances adsorbed in the zeolite, greatly improving the desorption and removal efficiency of high-boiling point substances such as ammonia substances in the waste gas of the adhesive industry, and greatly improving the safety of the purification system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model from the first viewing angle.

[0019] Among them, there are a first-level acid washing spray tower 1, a first air duct 21, a second-level alkali washing spray tower 3, a second air duct 22, a multi-stage high-efficiency dry filter 4, a fire damper 5, a desorption fan 6, a system fan 7, a chimney tower 8, a chimney 9, a catalytic bed 10, a cooling fan 11, a zeolite adsorption box 12, a main air duct 13, a cooling outlet duct 14, and a desorption inlet duct 15.

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. DETAILED DESCRIPTION

[0021] like Figure 1 As shown, this embodiment provides a waste gas purification system for the adhesive industry, which can effectively filter and adsorb various harmful substances in the waste gas, and can recycle the adsorption function of the purification system, so that the purification system can efficiently, long-term and stably treat the waste gas, and improve the purification efficiency and service life of the purification system. The system is particularly suitable for waste gas purification in the adhesive industry, and can also be used for waste gas purification in the fine chemical industry and waste gas purification in other industries.

[0022] Specifically, the purification system includes an adsorption device and a desorption device. The adsorption device of the system is mainly used to filter and adsorb various harmful substances in the exhaust gas. The desorption device of the system is mainly used to desorb various harmful gases adsorbed by the adsorption material in the adsorption device. When the adsorption device is saturated, the desorption program of the desorption device is started. Since the zeolite in the zeolite adsorption box is an inorganic substance of aluminum silicate, it can withstand a desorption airflow temperature of more than 200°C and will not burn. It can effectively remove various harmful substances adsorbed in the zeolite, thereby promoting the cyclic regeneration of the adsorption function of the system and avoiding frequent replacement of adsorption materials. The purification system has low operation and maintenance costs and high safety factors.

[0023] The adsorption device includes a primary acid washing spray tower 1, a first air duct 21, a secondary alkali washing spray tower 3, a second air duct 22, a multi-stage high-efficiency dry filter 4, a fire damper 5, a zeolite adsorption box 12, a main air duct 13, a system fan 7, a chimney tower 8, and a chimney 9. The primary acid washing spray tower 1, the first air duct 21, the secondary alkali washing spray tower 3, the second air duct 22, the multi-stage high-efficiency dry filter 4, the fire damper 5, the zeolite adsorption box 12, the main air duct 13, the system fan 7, and the chimney 9 are connected in sequence, and the connection direction from the primary acid washing spray tower 1 to the chimney 9 is the airflow direction of the adsorption device in the purification system. The chimney tower 8 fixes the outer periphery of the chimney 9. The primary acid washing spray tower 1 is used to spray out acidic water vapor, and use the acidic water vapor to acid wash and neutralize ammonia and other ammonia substances mixed in the exhaust gas. Ammonia and other ammonia substances are removed after acid washing and neutralization, and some waste gas and particulate matter soluble in water are removed at the same time; the first air duct 21 is used to connect the primary acid washing spray tower 1 and the secondary alkali washing spray tower 3; the secondary alkali washing spray tower 3 is used to neutralize and remove acidic water vapor and other substances brought out of the primary acid washing spray tower 1 to further remove odor; the second air duct 22 is used to connect the secondary alkali washing spray tower 3 and the multi-stage high-efficiency dry filter 4; the multi-stage high-efficiency dry filter 4 is used to filter and remove the waste gas. The fire damper 5 is used to connect the multi-stage high-efficiency dry filter 4 and the zeolite adsorption box 12. The fire damper 5 can effectively block the waste gas with too high temperature from entering the zeolite adsorption box 12 and other subsequent equipment to avoid the waste gas entering the zeolite adsorption box 12 affecting the adsorption efficiency due to too high temperature; the zeolite adsorption box 12 is used to adsorb various organic pollutants in the waste gas; the main air duct 13 is used to discharge the gas after the zeolite adsorption box 12 completes the adsorption; the system fan 7 is used to provide airflow power for the gas entering the main air duct 13 to be discharged to the chimney 9.

[0024] When the adsorption device is working, the waste gas first enters the primary acid washing spray tower 1, where ammonia and other ammonia substances are removed through acid washing and neutralization, and at the same time, some of the waste gas and particulate matter soluble in water are removed. Then, it passes through the first air duct 21 and enters the secondary alkaline washing spray tower 3 to remove acidic water vapor and other substances brought out of the primary acid washing spray tower 1, and further removes the odor. Then, it passes through the second air duct 22 and enters the multi-stage high-efficiency dry filter 4 to remove micron-sized particles and prevent the subsequent equipment from clogging the zeolite adsorbent. Then, the waste gas enters the zeolite adsorption box 12, where various harmful substances are removed through zeolite adsorption, and then enters the system fan 7 through the main air duct 13 and is discharged from the chimney 9;

[0025] The desorption device includes a desorption fan 6, a catalytic bed 10, a supplementary cooling fan 11, a zeolite adsorption box 12, a cooling air outlet pipe 14, and a desorption air inlet pipe 15. The desorption fan 6 provides flow power for the airflow between the zeolite adsorption box 12 and the catalytic bed 10; the catalytic bed 10 provides heat exchange and temperature-raising gas for the zeolite adsorption box 12 and provides catalytic combustion function for the gas after desorption from the zeolite adsorption box 12; the supplementary cooling fan 11 is used to provide airflow power to the cooling air outlet pipe 14; the zeolite adsorption box 12 is used to provide desorption gas; the cooling air outlet pipe 14 is used to provide the desorbed gas to flow into the catalytic bed 10 for catalytic combustion; the desorption air inlet pipe 15 is used to provide the high-temperature desorption airflow that has been heated by the catalytic bed 10 to enter the zeolite adsorption box 12 for high-temperature desorption; one end of the catalytic bed 10 is connected to the cooling air outlet pipe 14. The cooling air outlet duct 14 has its other end connected to the desorption air inlet duct 15, and the desorption fan 6 can be between the desorption air inlet duct 15 and the catalyst bed 10; the other end of the cooling air outlet duct 14 is connected to the zeolite adsorption box 12, and the supplementary cooling fan 11 can be between the cooling air outlet duct 14 and the zeolite adsorption box 12; the other end of the desorption air inlet duct 15 is connected to the zeolite adsorption box 12; the supplementary cooling fan 11 provides airflow power from the zeolite adsorption box 12 to the cooling air outlet duct 14 and then to the catalyst bed 10; the desorption fan 6 provides airflow power from the catalyst bed 10 to the desorption air inlet duct 15 and then to the zeolite adsorption box 12.

[0026] When the desorption device is working, the supplementary cooling fan 11 can introduce the airflow in the zeolite adsorption box 12 into the cooling air outlet duct 14, and then enter the airflow in the catalytic bed 10 for combustion and heating. The desorption fan 6 can introduce the high-temperature desorption airflow heated by heat exchange in the catalytic bed 10 into the desorption air inlet duct 15, and reach the zeolite adsorption box 12 through the desorption air inlet duct 15. The desorption airflow temperature can reach above 200°C, far exceeding the 120°C during the desorption of activated carbon. The zeolite adsorption box 12 can effectively remove various harmful substances adsorbed in the zeolite in the zeolite adsorption box 12 through the airflow temperature above 200°C. The desorption airflow after desorption in the zeolite adsorption box 12 is introduced into the cooling air outlet duct 14 under the action of the supplementary cooling fan 11, and then enters the catalytic bed 10 through the cooling air outlet duct 14 for catalytic combustion to catalytically burn the harmful substances in the desorbed airflow, and convert the harmful substances into carbon dioxide and water for discharge.

[0027] In some examples, the zeolite adsorption box 12 is a multi-stage zeolite adsorption box 12, in which zeolite adsorbents are arranged and combined in sequence. The multi-stage zeolite adsorption box 12 has a large zeolite adsorption area, which is beneficial to improving the adsorption efficiency.

[0028] In some examples, a protective shell is provided outside the zeolite adsorption box 12. The desorption temperature of the zeolite adsorption box 12 can reach above 200°C. The shell can effectively protect the staff and prevent the staff from accidentally touching and scalding. The zeolite adsorption box 12 is connected to the main air duct 13, the cooling air outlet duct 14, and the desorption air inlet duct 15 respectively. The shell is provided to facilitate the connection of the various pipes.

[0029] In some examples, the desorption air inlet pipe 15 is located at the bottom of the zeolite adsorption box 12 and is connected to the zeolite adsorption box 12. Under the action of the desorption fan 6, the high-temperature desorption airflow heated by the combustion in the catalytic bed 10 is introduced into the desorption air inlet pipe 15. The high-temperature desorption airflow enters the bottom of the zeolite adsorption box 12 through the desorption air inlet pipe 15. The high-temperature desorption airflow rises from the bottom of the zeolite adsorption box 12 due to the high temperature. The high-temperature desorption airflow spreads from bottom to top to the entire zeolite adsorption box 12, so that the high-temperature desorption reaction of the zeolite in the entire zeolite adsorption box 12 is sufficient, and various harmful substances adsorbed in the zeolite are effectively removed, which is beneficial to improve the zeolite desorption efficiency and purify the crystal cavity inside the zeolite, thereby promoting the cyclic regeneration of the adsorption function of the system.

[0030] In some examples, the cooling air outlet duct 14 is located at the top of the zeolite adsorption box 12 and is connected to the zeolite adsorption box 12. When high-temperature desorption is performed inside the zeolite adsorption box 12, the air flow after desorption rises due to the high temperature. The cooling air outlet duct 14 is connected to the top of the zeolite adsorption box 12, so that the cooling air outlet duct 14 can quickly capture the desorbed gas, thereby allowing the desorbed gas to quickly enter the catalyst bed 10 for catalytic combustion.

[0031] In some examples, the catalytic bed 10 and the desorption fan 6 are arranged in the same cavity, the catalytic bed 10 is at the top of the cavity, and the cooling air outlet pipe 14 passes through the top of the cavity and is connected to the catalytic bed 10, so that the desorbed gas can directly enter the catalytic bed 10 for catalytic combustion. The desorption fan 6 is in a pipe extending downward from the catalytic bed 10, and the bottom of the pipe extends downward in the cavity. The bottom of the pipe is connected to the desorption air inlet pipe 15. The function of the desorption fan 6 is to allow the high-temperature desorption airflow after heat exchange and heating of the catalytic bed 10 to flow into the pipe, enter the desorption air inlet pipe 15, and then enter the zeolite adsorption box 12.

[0032] In some examples, the air inlet of the first air duct 21 is located at the top of the first-level acid washing spray tower 1, the air outlet of the first air duct 21 is located at the bottom of the side of the second-level alkali washing spray tower 3, and the air inlet of the second air duct 22 is located at the top of the second-level alkali washing spray tower 3. This system layout greatly extends the direction of the airflow, so that the first-level acid washing spray tower 1 and the second-level alkali washing spray tower 3 can fully neutralize the acidic and alkaline substances in the exhaust gas and remove part of the exhaust gas soluble in water and the particulate matter carried in the exhaust gas.

[0033] Finally, it should be emphasized that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An exhaust gas purification system used in the adhesive industry, characterized by: The invention comprises an adsorption device and a desorption device, wherein the adsorption device comprises a multi-stage high-efficiency dry filter (4), a zeolite adsorption box (12), a main air duct (13), and a system fan (7); the multi-stage high-efficiency dry filter (4), the zeolite adsorption box (12), the main air duct (13), and the system fan (7) are connected in sequence; the connection direction from the multi-stage high-efficiency dry filter (4) to the system fan (7) is the airflow direction of the adsorption device in the purification system; The desorption device comprises a desorption fan (6), a catalyst bed (10), a supplementary cooling fan (11), a zeolite adsorption box (12), a cooling air outlet pipe (14), and a desorption air inlet pipe (15); one end of the catalyst bed (10) is connected to the cooling air outlet pipe (14), and the other end is connected to the desorption air inlet pipe (15); the desorption fan (6) is between the desorption air inlet pipe (15) and the catalyst bed (10); the other end of the cooling air outlet pipe (14) is connected to the zeolite adsorption box (12); the supplementary cooling fan (11) is between the cooling air outlet pipe (14) and the zeolite adsorption box (12); and the other end of the desorption air inlet pipe (15) is connected to the zeolite adsorption box (12).

2. The waste gas purification system for adhesive industry according to claim 1 is characterized in that: The adsorption device further comprises a primary acid washing spray tower (1), a first air duct (21), a secondary alkali washing spray tower (3), a second air duct (22), a fire damper (5), a chimney tower (8), and a chimney (9).

3. The waste gas purification system for adhesive industry according to claim 2 is characterized in that: The air inlet of the first air duct (21) is located at the top of the first-stage acid washing spray tower (1), the air outlet of the first air duct (21) is located at the bottom of the side of the second-stage alkali washing spray tower (3), the air inlet of the second air duct (22) is located at the top of the second-stage alkali washing spray tower (3), and the other end of the second air duct (22) is connected to the top of the multi-stage high-efficiency dry filter (4).

4. The waste gas purification system for adhesive industry according to claim 2 is characterized in that: The fire damper (5) is connected between the multi-stage high-efficiency dry filter (4) and the zeolite adsorption box (12).

5. The exhaust gas purification system used in the adhesive industry according to claim 2 is characterized in that: The chimney (9) is connected to the system fan (7), and the chimney tower (8) is fixed on the outer periphery of the chimney (9).

6. The exhaust gas purification system for adhesive industry according to claim 5 is characterized in that: The zeolite adsorption box (12) is a multi-stage zeolite adsorption box, and the zeolite adsorbents in the multi-stage zeolite adsorption box (12) are arranged and combined in sequence.

7. The waste gas purification system for adhesive industry according to claim 6 is characterized in that: A protective shell is arranged outside the zeolite adsorption box (12), and the shell of the zeolite adsorption box (12) is respectively connected to the main air duct (13), the cooling air outlet duct (14), and the desorption air inlet duct (15).

8. The exhaust gas purification system for adhesive industry according to claim 7 is characterized in that: The desorption air inlet pipe (15) is located at the bottom of the zeolite adsorption box (12) and is in communication with the zeolite adsorption box (12).

9. The waste gas purification system for adhesive industry according to claim 8 is characterized in that: The cooling air outlet pipe (14) is located at the top of the zeolite adsorption box (12) and is in communication with the zeolite adsorption box (12).

10. The waste gas purification system for adhesive industry according to claim 9 is characterized in that: The catalytic bed (10) and the desorption fan (6) are arranged in the same cavity, the catalytic bed (10) is at the top of the cavity, the cooling air outlet pipe (14) passes through the top of the cavity and is connected to the catalytic bed (10), and the desorption fan (6) is in a pipe extending downward from the catalytic bed (10), the bottom of the pipe extends downward in the cavity, and the bottom of the pipe is connected to the desorption air inlet pipe (15).

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