Pulping system waste gas treatment process based on recycling supergravity technology

Abstract

The invention discloses a pulping system waste gas treatment process based on a recycling supergravity technology. The pulping system waste gas treatment process comprises the following steps: step 1, waste gas collection and pretreatment; 2, waste gas purification pretreatment; step 3, carrying out supergravity primary absorption treatment; 4, residual pollutants are removed through electrolysis; step 5, carrying out supergravity secondary absorption treatment; 6, gas-liquid separation and recovery and waste gas emission are carried out; the multistage parallel super-gravity electrolysis system is adopted, huge gravitational acceleration is formed in a centrifugal force field rotating at a high speed, molecular-level collision of tail gas and absorption liquid is achieved, the purification efficiency is greatly improved, and the purification efficiency is greatly improved aiming at the characteristics that waste gas of a pulping system is complex in composition and contains a large amount of moisture and fine fibers. Impurity removal and purification pretreatment is carried out through a spraying system containing a filler layer, water molecules and other solid molecules are effectively separated, the subsequent treatment effect is improved, and in treated waste gas, absorption liquid is recycled and recycled through a gas-liquid separation technology.

Description

Technical Field

[0001] The invention relates to the technical field of waste gas treatment in a pulping system, and in particular to a waste gas treatment process in a pulping system based on resource recovery supergravity technology. Background Art

[0002] As a key basic raw material industry closely linked to the national economy and social development, the papermaking industry not only demonstrates the characteristics of sustainable development, but also plays a pivotal role in all areas of the national economy. Since the country implemented the ban on waste paper imports, this policy has strongly promoted papermaking enterprises to maximize resource utilization and deep recycling of water resources in the production process. In order to effectively save raw material costs, papermaking enterprises have taken measures to deeply recycle and reuse wastes such as sludge and white water. In this process, since the recycled raw materials have been recycled many times, the pulping system has to rely on the addition of a large number of chemical auxiliary materials to ensure product quality. Under this background, a large amount of unpleasant odors are inevitably generated during the pulping process. These unorganized odors not only seriously deteriorate the production environment of the factory, but also pose a potential threat to the physical and mental health of employees. Therefore, the treatment of these odors is particularly important. Efficient and harmless cleaning technologies must be adopted to achieve their clean treatment, thereby ensuring the comfort of the production environment and the health rights and interests of employees.

[0003] The existing waste gas treatment process of the pulping system has the following defects: First, the traditional centrifugal method relies on the motor to drive the rotor to rotate at high speed, and uses centrifugal force to throw the waste gas components with larger specific gravity to the side wall, thereby achieving gas-solid or gas-liquid separation. However, limited by the current technical level, this method often cannot ensure sufficient contact between the exhaust gas and the absorption liquid. Due to the limited contact area and short contact time, harmful substances in the waste gas are difficult to be effectively captured and removed, resulting in low overall purification efficiency and difficulty in achieving ideal treatment effects; Second, the waste gas generated by the pulping system is extremely complex. It not only contains a large amount of water, but also carries fine fibers and other impurities. The presence of these impurities poses a severe challenge to subsequent treatment steps. Existing pretreatment processes, such as simple It is often difficult to effectively separate these tiny impurities through filtration or sedimentation, resulting in a large amount of unremoved pollutants in the treated waste gas, affecting the stability and efficiency of subsequent treatment steps; third, the absorption method is a commonly used waste gas treatment method. Through the contact between the mixed gas and the liquid absorbent, the harmful substances in the waste gas are converted into non-toxic and odorless gas through chemical reactions, thereby achieving the purpose of purification. Although the absorption method has a high purification efficiency, there are problems of insufficient resource recovery and lax emission control in actual applications. The useful components in the absorption liquid are often not fully utilized, resulting in a waste of resources; at the same time, the emission control of the treated waste gas is not strict enough, making it difficult to achieve a true zero emission goal, posing a potential threat to the environment. Summary of the invention

[0004] The purpose of the present invention is to provide a waste gas treatment process for a pulping system based on resource-based ultra-gravity technology to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a waste gas treatment process of a pulping system based on resource-based ultra-gravity technology, comprising step one, waste gas collection and pretreatment; step two, waste gas purification pretreatment; step three, ultra-gravity primary absorption treatment; step four, electrolysis to remove residual pollutants; step five, ultra-gravity secondary absorption treatment; step six, gas-liquid separation recovery and waste gas discharge;

[0006] Wherein in the above step 1, the waste gas is collected and pre-treated through the waste gas collection pipeline network;

[0007] In the above step 2, further impurity removal and purification are carried out through a spray system containing a higher level filler layer;

[0008] In the above step 3, the waste gas after purification and pretreatment enters the supergravity primary absorption system to achieve the transfer of pollutant molecules from the gas phase to the liquid phase;

[0009] In the above step 4, electrolysis is used to treat the absorption liquid to maximize the removal of residual pollutants and improve the purification effect of the exhaust gas;

[0010] In the above step 5, the waste gas after electrolysis treatment enters the super gravity secondary absorption system to further remove residual pollutants in the waste gas;

[0011] In the above step six, the absorption liquid in the waste gas is completely separated by a gas-liquid separator to ensure the clean discharge of the waste gas, and the separated absorption liquid is reused through a circulation pump to achieve the recycling of resources.

[0012] As a further technical solution of the present invention, in the step one, first, the waste gas generated by the pulping system is centrally collected through an efficient and well-sealed waste gas collection pipe network. These pipes need to be cleaned regularly to ensure the continuity and efficiency of waste gas collection. The collected waste gas contains a large amount of moisture and fine fibers, and needs to be pretreated before directly entering the treatment system.

[0013] As a further technical solution of the present invention, in the step one, a spray system containing a high-efficiency filler layer is used in the pretreatment stage. The system is made of corrosion-resistant and wear-resistant materials. The filler layer is designed with a specific geometric structure to increase the gas-liquid contact area. The spray system uses a high-pressure pump to evenly spray the spray liquid containing chemical agents into the exhaust gas, and uses the spraying effect to preliminarily separate the moisture and solid impurities in the exhaust gas. The selection of the spray liquid needs to be customized according to the composition of the exhaust gas to maximize the removal effect. The pretreatment time is 10 to 15 minutes to ensure that the exhaust gas is effectively purified before entering the subsequent treatment steps.

[0014] As a further technical solution of the present invention, in the step 2, the pretreated exhaust gas enters a spray system containing a higher-level packing layer for further impurity removal and purification. At this stage, the design of the packing layer is more complex, which increases the gas-liquid contact area and reaction time. The spray liquid ensures full contact with the exhaust gas through precisely controlled flow and pressure, promoting the chemical reaction between harmful substances in the exhaust gas and the spray liquid. The purification pretreatment time is 20 to 30 minutes. Through this step, most of the impurities in the exhaust gas, including some volatile organic compounds and fine fibers, can be removed, which is convenient for subsequent ultra-gravity treatment.

[0015] As a further technical solution of the present invention, in the step three, the waste gas after purification and pretreatment enters the supergravity primary absorption system, which is composed of a high-speed rotating centrifugal device and an efficient absorption liquid circulation system. Under the action of centrifugal force, the waste gas collides with the absorption liquid at the molecular level in the high-speed rotating centrifugal field, thereby realizing the transfer of pollutant molecules from the gas phase to the liquid phase.

[0016] As a further technical solution of the present invention, in the step three, by selecting a suitable absorption liquid and gravity multiple, the odor, hydrogen sulfide, ammonia and other harmful substances in the exhaust gas can be effectively removed. The primary absorption treatment time is 15 to 20 minutes. After treatment, most of the pollutants in the exhaust gas are absorbed into the liquid phase, and the exhaust gas is preliminarily purified.

[0017] As a further technical solution of the present invention, in step 4, although most of the pollutants in the waste gas after the supergravity primary absorption treatment have been removed, some pollutants that are difficult to remove by physical methods may still remain. At this time, electrolysis is used to treat the absorption liquid.

[0018] As a further technical solution of the present invention, in step four, the electrolysis device is composed of an electrolytic cell, electrodes and a power supply. The absorption liquid in the electrolytic cell undergoes a chemical reaction under the electric field through the action of the electrodes to convert the pollutants into harmless substances or a form that is easy to handle. The electrolysis time is 30 to 60 minutes. By precisely controlling the electrolysis conditions, such as current density, electrolysis voltage and electrolysis time, the removal of residual pollutants can be maximized and the purification effect of the exhaust gas can be improved.

[0019] As a further technical solution of the present invention, in the step five, in order to ensure the thorough purification of the exhaust gas, the exhaust gas treated by electrolysis enters the supergravity secondary absorption system, which is similar to the primary absorption system, but adopts a higher gravity multiple and a more optimized absorption liquid formula. The secondary absorption treatment time is 10 to 15 minutes. By further utilizing the supergravity technology to strengthen the gas-liquid mass transfer process, the residual pollutants in the exhaust gas can be further removed to ensure that the exhaust gas purification effect meets the technical standard requirements.

[0020] As a further technical solution of the present invention, in step six, the waste gas after ultra-gravity secondary absorption treatment enters a high-efficiency gas-liquid separator. The separator adopts advanced physical separation technology, such as centrifugal separation or filtration separation, to completely separate the absorption liquid in the waste gas to ensure the clean discharge of the waste gas. The separated absorption liquid is reused through a circulation pump to achieve the recycling of resources and reduce the waste of water resources. At the same time, the gas discharged from the discharge port is subjected to online component detection to ensure that the waste gas emissions meet the technical standards and environmental protection requirements. The detection frequency is generally once an hour to ensure real-time monitoring of the waste gas emission quality.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention adopts a multi-stage parallel ultra-gravity electrolysis system to form a huge gravitational acceleration in a high-speed rotating centrifugal field, thereby realizing molecular-level collision between tail gas and absorption liquid, and greatly improving the purification efficiency. In view of the characteristics of the pulping system waste gas with complex components and containing a large amount of water and fine fibers, a spray system containing a filler layer is used for impurity removal and purification pretreatment, which effectively separates water molecules and other solid molecules and improves the effect of subsequent treatment. In the treated waste gas, the absorption liquid is recovered and recycled through gas-liquid separation technology, while ensuring that the waste gas meets the clean emission standards, thereby achieving maximum resource utilization and zero environmental emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure is a flow chart of the process of the present invention. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] Please see attached Figure 1 The present invention provides an embodiment: a waste gas treatment process of a pulping system based on resource-based ultra-gravity technology, comprising step one, waste gas collection and pretreatment; step two, waste gas purification pretreatment; step three, ultra-gravity primary absorption treatment; step four, electrolysis to remove residual pollutants; step five, ultra-gravity secondary absorption treatment; step six, gas-liquid separation recovery and waste gas discharge;

[0025] In the above step 1, first, the waste gas generated by the pulping system is collected centrally through an efficient and well-sealed waste gas collection pipeline network. These pipelines need to be cleaned regularly to ensure the continuity and efficiency of waste gas collection. The collected waste gas contains a large amount of water and fine fibers, and needs to be pretreated before directly entering the treatment system. In the pretreatment stage, a spray system containing a high-efficiency filler layer is used. The system is made of corrosion-resistant and wear-resistant materials. The filler layer is designed with a specific geometric structure to increase the gas-liquid contact area. The spray system uses a high-pressure pump to evenly spray the spray liquid containing chemical agents into the waste gas, and uses the spraying effect to preliminarily separate the water and solid impurities in the waste gas. The selection of the spray liquid needs to be customized according to the waste gas composition to maximize the removal effect. The pretreatment time is 10 to 15 minutes to ensure that the waste gas is effectively purified before entering the subsequent treatment steps;

[0026] In the above step 2, the pretreated waste gas enters the spray system containing a higher level packing layer for further impurity removal and purification. In this stage, the design of the packing layer is more complex, which increases the gas-liquid contact area and reaction time. The spray liquid is ensured to be fully in contact with the waste gas through the precisely controlled flow rate and pressure, promoting the chemical reaction between the harmful substances in the waste gas and the spray liquid. The purification pretreatment time is 20 to 30 minutes. Through this step, most of the impurities in the waste gas, including some volatile organic compounds and fine fibers, can be removed, which is convenient for subsequent ultra-gravity treatment.

[0027] In the above step 3, the waste gas after purification and pretreatment enters the supergravity primary absorption system, which is composed of a high-speed rotating centrifugal device and an efficient absorption liquid circulation system. Under the action of centrifugal force, the waste gas collides with the absorption liquid at the molecular level in the high-speed rotating centrifugal field to realize the transfer of pollutant molecules from the gas phase to the liquid phase. By selecting a suitable absorption liquid and gravity multiple, the odor, hydrogen sulfide, ammonia and other harmful substances in the waste gas can be effectively removed. The primary absorption treatment time is 15 to 20 minutes. After treatment, most of the pollutants in the waste gas are absorbed into the liquid phase, and the waste gas is preliminarily purified.

[0028] In the above step 4, although most of the pollutants in the waste gas after the supergravity first-level absorption treatment have been removed, some pollutants that are difficult to remove by physical methods may still remain. At this time, electrolysis is used to treat the absorption liquid. The electrolysis device consists of an electrolytic cell, electrodes and a power supply. The absorption liquid in the electrolytic cell undergoes a chemical reaction under the action of the electrodes under the electric field to convert the pollutants into harmless substances or forms that are easy to handle. The electrolysis time is 30 to 60 minutes. By precisely controlling the electrolysis conditions, such as current density, electrolysis voltage and electrolysis time, the residual pollutants can be removed to the maximum extent and the purification effect of the waste gas can be improved.

[0029] In the above step 5, in order to ensure the thorough purification of the waste gas, the waste gas after electrolysis treatment enters the supergravity secondary absorption system, which is similar to the primary absorption system, but uses a higher gravity multiple and a more optimized absorption liquid formula. The secondary absorption treatment time is 10 to 15 minutes. By using the supergravity technology again to strengthen the gas-liquid mass transfer process, the residual pollutants in the waste gas can be further removed to ensure that the purification effect of the waste gas meets the technical standard requirements;

[0030] In the above step six, the waste gas after the ultra-gravity secondary absorption treatment enters the high-efficiency gas-liquid separator. The separator adopts advanced physical separation technology, such as centrifugal separation or filtration separation, to completely separate the absorption liquid in the waste gas to ensure the clean discharge of the waste gas. The separated absorption liquid is reused through a circulation pump to achieve the recycling of resources and reduce the waste of water resources. At the same time, the gas discharged from the discharge port is tested for its composition online to ensure that the waste gas emissions meet the technical standards and environmental protection requirements. The detection frequency is generally once an hour to ensure real-time monitoring of the waste gas emission quality.

[0031] Based on the above, the advantages of the present invention are: the present invention innovatively adopts a multi-stage parallel ultra-gravity electrolysis system, which forms a huge gravitational acceleration in a high-speed rotating centrifugal field. This technological breakthrough realizes the molecular-level collision of tail gas and absorption liquid, greatly improving the purification efficiency. In view of the characteristics of the pulping system waste gas with complex components and containing a large amount of water and fine fibers, the present invention designs a spray system containing a filler layer to perform impurity removal and purification pretreatment. This process effectively separates water molecules and other solid molecules, lays a good foundation for subsequent treatment steps, and significantly improves the overall treatment effect. In the ultra-gravity electrolysis system, the centrifugal field generated by high-speed rotation not only accelerates the collision frequency between molecules, but also allows the absorption liquid to form extremely thin liquid films and droplets in an ultra-gravity environment, greatly increasing the gas-liquid contact area. , thereby realizing the rapid and efficient capture and absorption of pollutants in the exhaust gas. This process not only greatly improves the purification efficiency, but also reduces energy consumption and the risk of secondary pollution. Furthermore, the present invention adopts advanced gas-liquid separation technology in the treated exhaust gas to recover and recycle the absorption liquid. This measure not only realizes the maximum utilization of resources, but also significantly reduces the treatment cost, while ensuring that the exhaust gas meets the clean emission standards, truly realizing zero emissions to the environment. In summary, the present invention effectively solves the difficult problems in the exhaust gas treatment of the pulping system through the comprehensive application of a multi-stage parallel supergravity electrolysis system, a spray system containing a filler layer for impurity removal and purification pretreatment, and a gas-liquid separation technology, and achieves the goal of efficient, clean and environmentally friendly exhaust gas treatment, which is of great significance for promoting the sustainable development of the papermaking industry.

[0032] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A waste gas treatment process for a pulping system based on resource-based high-gravity technology, comprising step one, waste gas collection and pretreatment; step two, waste gas purification pretreatment; step three, high-gravity primary absorption treatment; step four, electrolysis to remove residual pollutants; step five, high-gravity secondary absorption treatment; step six, gas-liquid separation recovery and waste gas discharge; characterized in that: Wherein in the above step 1, the waste gas is collected and pre-treated through the waste gas collection pipeline network; In the above step 2, further impurity removal and purification are carried out through a spray system containing a higher level filler layer; In the above step 3, the waste gas after purification and pretreatment enters the supergravity primary absorption system to achieve the transfer of pollutant molecules from the gas phase to the liquid phase; In the above step 4, electrolysis is used to treat the absorption liquid to maximize the removal of residual pollutants and improve the purification effect of the exhaust gas; In the above step 5, the waste gas after electrolysis treatment enters the super gravity secondary absorption system to further remove residual pollutants in the waste gas; In the above step six, the absorption liquid in the waste gas is completely separated by a gas-liquid separator to ensure the clean discharge of the waste gas, and the separated absorption liquid is reused through a circulation pump to achieve the recycling of resources.

2. The waste gas treatment process of a pulping system based on resource-based ultra-gravity technology according to claim 1 is characterized by: In the step 1, first, the waste gas generated by the pulping system is collected centrally through an efficient and well-sealed waste gas collection pipe network. These pipes need to be cleaned regularly to ensure the continuity and efficiency of waste gas collection. The collected waste gas contains a large amount of moisture and fine fibers, and needs to be pretreated before directly entering the treatment system.

3. The waste gas treatment process of a pulping system based on resource-based ultra-gravity technology according to claim 2 is characterized by: In the step one, a spray system containing a high-efficiency filler layer is used in the pretreatment stage. The system is made of corrosion-resistant and wear-resistant materials. The filler layer is designed with a specific geometric structure to increase the gas-liquid contact area. The spray system uses a high-pressure pump to evenly spray the spray liquid containing chemical agents into the exhaust gas, and uses the spraying effect to preliminarily separate the moisture and solid impurities in the exhaust gas. The selection of the spray liquid needs to be customized according to the composition of the exhaust gas to maximize the removal effect. The pretreatment time is 10 to 15 minutes to ensure that the exhaust gas is effectively purified before entering the subsequent treatment steps.

4. The waste gas treatment process of a pulping system based on resource-based ultra-gravity technology according to claim 1 is characterized by: In the step 2, the pretreated waste gas enters a spray system containing a higher level packing layer for further impurity removal and purification. In this stage, the design of the packing layer is more complex, which increases the gas-liquid contact area and reaction time. The spray liquid ensures full contact with the waste gas through precisely controlled flow and pressure, promoting the chemical reaction between harmful substances in the waste gas and the spray liquid. The purification pretreatment time is 20 to 30 minutes. Through this step, most of the impurities in the waste gas, including some volatile organic compounds and fine fibers, can be removed, which is convenient for subsequent ultra-gravity treatment.

5. The waste gas treatment process of a pulping system based on resource-based ultra-gravity technology according to claim 1 is characterized by: In the step three, the waste gas after purification and pretreatment enters the supergravity primary absorption system, which is composed of a high-speed rotating centrifugal device and an efficient absorption liquid circulation system. Under the action of centrifugal force, the waste gas collides with the absorption liquid at the molecular level in the high-speed rotating centrifugal field, thereby realizing the transfer of pollutant molecules from the gas phase to the liquid phase.

6. The waste gas treatment process of a pulping system based on resource-based ultra-gravity technology according to claim 5 is characterized by: In the step three, by selecting a suitable absorption liquid and gravity multiple, the odor, hydrogen sulfide, ammonia and other harmful substances in the exhaust gas can be effectively removed. The primary absorption treatment time is 15 to 20 minutes. After treatment, most of the pollutants in the exhaust gas are absorbed into the liquid phase, and the exhaust gas is preliminarily purified.

7. The waste gas treatment process of a pulping system based on resource-based ultra-gravity technology according to claim 1 is characterized by: In the step 4, although most of the pollutants in the waste gas after the supergravity primary absorption treatment have been removed, some pollutants that are difficult to remove by physical methods may still remain. At this time, electrolysis is used to treat the absorption liquid.

8. The waste gas treatment process of a pulping system based on resource-based ultra-gravity technology according to claim 7 is characterized by: In step 4, the electrolysis device consists of an electrolytic cell, electrodes and a power source. The absorption liquid in the electrolytic cell undergoes a chemical reaction under the electric field through the action of the electrodes, converting the pollutants into harmless substances or forms that are easy to handle. The electrolysis time is 30 to 60 minutes. By precisely controlling the electrolysis conditions, such as current density, electrolysis voltage and electrolysis time, the removal of residual pollutants can be maximized and the purification effect of the exhaust gas can be improved.

9. The waste gas treatment process of a pulping system based on resource-based ultra-gravity technology according to claim 1 is characterized by: In the step five, in order to ensure the thorough purification of the exhaust gas, the exhaust gas after electrolysis treatment enters the supergravity secondary absorption system, which is similar to the primary absorption system, but uses a higher gravity multiple and a more optimized absorption liquid formula. The secondary absorption treatment time is 10 to 15 minutes. By further utilizing the supergravity technology to strengthen the gas-liquid mass transfer process, the residual pollutants in the exhaust gas can be further removed to ensure that the exhaust gas purification effect meets the technical standard requirements.

10. The waste gas treatment process of a pulping system based on resource-based ultra-gravity technology according to claim 1 is characterized by: In the step six, the waste gas after the ultra-gravity secondary absorption treatment enters the high-efficiency gas-liquid separator. The separator adopts advanced physical separation technology, such as centrifugal separation or filtration separation, to completely separate the absorption liquid in the waste gas to ensure the clean discharge of the waste gas. The separated absorption liquid is reused through a circulation pump to achieve the recycling of resources and reduce the waste of water resources. At the same time, the gas discharged from the discharge port is tested for its composition online to ensure that the waste gas emissions meet the technical standards and environmental protection requirements. The detection frequency is generally once an hour to ensure real-time monitoring of the waste gas emission quality.

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