A waste gas treatment device for polyurethane resin production

Abstract

The utility model discloses a kind of waste gas treatment devices for polyurethane resin production, including condensing chamber, the top of condensing chamber is equipped with gas inlet, the pipeline of one side of condensing chamber has several adsorption towers, several activated carbon adsorption plates are movably arranged in the inner wall of adsorption tower, the inner wall bottom end of adsorption tower is equipped with steam generator, the inner wall bottom end of adsorption tower is fixedly provided with hot air fan, the inner wall bottom end of adsorption tower is fixedly provided with cooling fan, steam generator is arranged in parallel with hot air fan and cooling fan, and is parallel with activated carbon adsorption plate, the pipeline of one side of adsorption tower is connected with preheating chamber, the pipeline of other side of preheating chamber is connected with reaction chamber;Movable activated carbon adsorption plate is arranged in adsorption tower, can be flexibly replaced and maintained, ensure the sustained and efficient adsorption of organic pollutants in waste gas, the steam generator, hot air fan and cooling fan integrated in adsorption tower, can realize the regeneration and recycling of activated carbon adsorption plate, reduce operating cost.

Description

Technical Field

[0001] This utility model relates to the technical field of waste gas treatment devices, and in particular to a waste gas treatment device for polyurethane resin production. Background Technology

[0002] The production process of polyurethane resin generates complex waste gases containing various volatile organic compounds (VOCs) and toxic and harmful gases. If these waste gases are discharged directly without treatment, they will not only cause serious pollution to the atmospheric environment, harm the surrounding ecosystem and human health, but may also violate environmental regulations, resulting in environmental penalties and reputational damage to enterprises.

[0003] The design requirements of this device aim to achieve comprehensive and efficient treatment of waste gas from polyurethane resin production. On the one hand, it must be able to effectively separate condensable and non-condensable components in the waste gas to improve treatment efficiency. On the other hand, for non-condensable organic pollutants, thorough purification through adsorption and catalytic oxidation is necessary to ensure that the emitted gas meets environmental standards. Simultaneously, considering the operating costs of enterprises, the device must also have an activated carbon adsorption plate regeneration function to reduce consumable replacement costs and ensure stable operation, ease of operation, and convenient maintenance, thereby meeting the long-term, efficient, and environmentally friendly production needs of polyurethane resin manufacturers. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a waste gas treatment device for polyurethane resin production.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A waste gas treatment device for polyurethane resin production includes a condensation chamber with an air inlet at its top. A plurality of adsorption towers are connected to a pipeline on one side of the condensation chamber. A plurality of activated carbon adsorption plates are movably arranged on the inner wall of each adsorption tower. A steam generator is located at the bottom of the inner wall of each adsorption tower. A hot air fan and a cooling fan are fixedly installed at the bottom of the inner wall of each adsorption tower. The steam generator, hot air fan, and cooling fan are arranged side-by-side and parallel to the activated carbon adsorption plates. A preheating chamber is connected to a pipeline on one side of the adsorption tower, and a reaction chamber is connected to a pipeline on the other side of the preheating chamber.

[0007] As a further embodiment of this utility model: a condenser tube is fixedly installed on the inner wall of the condensing chamber, the condenser tube is connected to the air inlet, the condenser tube extends downward in a spiral shape, a liquid outlet pipe is opened on one side of the bottom end of the condenser tube, a cooling nozzle is fixedly installed at the top of the inner wall of the condensing chamber, a cooling water tank is fixedly installed on the outer side of the condensing chamber, the water tank is connected to the cooling nozzle pipeline, and a return groove is opened at the bottom of the inner wall of the condensing chamber, the return groove is connected to the cooling water tank pipeline.

[0008] As a further improvement of this utility model: the surface of the condenser tube is provided with several air outlets, and a three-way pump is fixedly installed on the outside of the condenser tube, and the three-way pump is connected to the air outlet pipeline.

[0009] As a further improvement of this utility model: an exhaust pump is provided at the top of the adsorption tower, and an operating port is provided at the top of the adsorption tower, which is connected to the preheating chamber pipeline.

[0010] As a further improvement of this utility model: the inner wall of the preheating chamber is fixedly provided with several sets of electric heating wire mesh, and the inner walls of the reaction chamber are fixedly provided with several wavy gas guide plates.

[0011] As a further improvement of this invention: several rows of honeycomb-shaped ceramic supports are fixedly arranged at the center of the inner wall of the reaction chamber. These ceramic supports are parallel to each other, and a noble metal catalyst is fixedly arranged on the inner wall. It is worth noting that the noble metal catalyst can be platinum or palladium. Under the action of the catalyst, organic pollutants in the waste gas (such as isocyanates, benzene compounds, volatile organic compounds, etc.) undergo catalytic oxidation. Taking toluene (C7H8) as an example, its reaction equation is: C7H8 + 9O2 → 7CO2 + 4H2O. The catalyst can lower the activation energy of the reaction, allowing oxidation reactions that originally required higher temperatures (600-800℃) to proceed rapidly at relatively low temperatures of 250-350℃.

[0012] Compared with the prior art, the present invention provides a waste gas treatment device for polyurethane resin production, which has the following beneficial effects:

[0013] 1. In this utility model, the combination of a spiral condenser tube and a cooling nozzle in the condensation chamber can fully cool condensable substances in the waste gas, enabling them to be quickly liquefied and recovered, reducing resource waste. The activated carbon adsorption plate in the adsorption tower can effectively adsorb organic impurities and odor molecules in the waste gas. At the same time, the installation of a steam generator, a hot air fan, and a cooling fan can regenerate the activated carbon adsorption plate, extending its service life and reducing operating costs.

[0014] 2. In this invention, the condenser tube adopts a spiral rotating extension method, which increases the contact area and contact time between the waste gas and the condenser tube, thereby improving the condensation efficiency. The reflux trough of the condensation chamber and the cooling water tank form a circulating cooling system, ensuring the continuity and stability of the cooling effect. The movable setting of the activated carbon adsorption plate in the adsorption tower facilitates replacement and maintenance. The reasonable layout of the exhaust pump and the working port ensures the smooth flow of waste gas and the normal operation of the equipment. These structural designs effectively guarantee the treatment effect and operational stability of the entire device.

[0015] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This utility model has a simple structure and is easy to operate. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a waste gas treatment device for polyurethane resin production proposed in this utility model.

[0017] Figure 2 This is a schematic cross-sectional view of the condenser chamber of a waste gas treatment device for polyurethane resin production proposed in this utility model.

[0018] Figure 3 This is a cross-sectional three-dimensional structural diagram of the adsorption tower of a waste gas treatment device for polyurethane resin production proposed in this utility model.

[0019] Figure 4 This is a cross-sectional three-dimensional structural diagram of the preheating chamber of a waste gas treatment device for polyurethane resin production proposed in this utility model.

[0020] In the diagram: 1. Condensation chamber; 2. Air inlet; 3. Adsorption tower; 4. Activated carbon adsorption plate; 5. Steam generator; 6. Hot air fan; 7. Cooling fan; 8. Preheating chamber; 9. Reaction chamber; 10. Condensation pipe; 11. Liquid outlet pipe; 12. Cooling nozzle; 13. Cooling water tank; 14. Reflux tank; 15. Air outlet; 16. Three-way pump; 17. Exhaust pump; 18. Working port; 19. Electric heating wire mesh; 20. Gas guide plate; 21. Ceramic carrier; 22. Precious metal catalyst. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] Example: A waste gas treatment device for polyurethane resin production, such as... Figures 1-4 As shown, the system includes a condensing chamber 1 with an air inlet 2 at its top. Several adsorption towers 3 are connected to one side of the condensing chamber 1 via a pipe. Several activated carbon adsorption plates 4 are movably installed on the inner wall of each adsorption tower 3. A steam generator 5 is located at the bottom of the inner wall of each adsorption tower 3. A hot air fan 6 and a cooling fan 7 are also fixedly installed at the bottom of the inner wall of each adsorption tower 3. The steam generator 5, hot air fan 6, and cooling fan 7 are arranged side-by-side and parallel to the activated carbon adsorption plates 4. A preheating chamber 8 is connected to one side of the adsorption tower 3 via a pipe, and a reaction chamber 9 is connected to the other side of the preheating chamber 8 via a pipe. A condensing pipe 10 is fixedly installed on the inner wall of the condensing chamber 1 and is connected to the air inlet 2. The condenser tube 10 extends downwards in a spiral shape, and a liquid outlet pipe 11 is opened on one side of the bottom end of the condenser tube 10. The activated carbon adsorption plate 4 adsorbs and purifies the organic pollutants in the waste gas. When the activated carbon is saturated, the steam generator 5 generates steam and the hot air fan 6 provides hot air for desorption and regeneration. Then, the adsorption capacity is restored by cooling fan 7. Multiple adsorption towers 3 are arranged in parallel, which can flexibly switch between use and regeneration to ensure the continuity of waste gas treatment. The steam generator 5, hot air fan 6, and cooling fan 7 work together to realize the automated regeneration of the activated carbon adsorption plate 4 and extend its service life. Multiple fans precisely control the airflow, which, together with the efficient adsorption of activated carbon in the adsorption tower 3, greatly improves the purification efficiency and stability.

[0024] like Figures 1-4 As shown, a cooling nozzle 12 is fixedly installed at the top of the inner wall of the condensing chamber 1, and a cooling water tank 13 is fixedly installed on the outer side of the condensing chamber 1. The water tank is connected to the cooling nozzle 12 by pipes. A return groove 14 is opened at the bottom of the inner wall of the condensing chamber 1, and the return groove 14 is connected to the cooling water tank 13 by pipes. Several air outlets 15 are opened on the surface of the condensing pipe 10, and a three-way pump 16 is fixedly installed on the outer side of the condensing pipe 10. The three-way pump 16 is connected to the air outlets 15 by pipes.

[0025] like Figures 1-3As shown, an exhaust pump 17 is installed at the top of the adsorption tower 3, and an operating port 18 is also installed at the top of the adsorption tower 3. The operating port 18 is connected to the preheating chamber 8 via a pipeline. Several sets of electric heating wire mesh 19 are fixedly installed on the inner wall of the preheating chamber 8. Several wavy gas guide plates 20 are fixedly installed on both sides of the inner wall of the reaction chamber 9. Several rows of honeycomb-shaped ceramic carriers 21 are fixedly installed in the center of the inner wall of the reaction chamber 9. The ceramic carriers 21 are parallel to each other, and a precious metal catalyst 22 is fixedly installed on the inner wall. The preheating chamber 8 precisely preheats the waste gas through the electric heating wire mesh 19, creating the optimal temperature conditions for the catalytic reaction. The unique wavy gas guide plates 20 in the reaction chamber 9, combined with the honeycomb-shaped ceramic carriers 21 loaded with precious metal catalyst 22, optimize the flow path of the waste gas, ensure full contact between the waste gas and the catalyst, greatly improve the catalytic oxidation efficiency, and can completely decompose the harmful substances in the waste gas into harmless substances, achieving a dual improvement in the efficiency and environmental protection of waste gas treatment.

[0026] Working Principle: During the polyurethane resin production process, the waste gas first enters the condensation chamber 1 through inlet 2. Inside the condensation chamber 1, the waste gas flows along the spiral condenser pipe 10. The condenser pipe 10 and cooling nozzle 12 cool the gas, liquefying condensable substances in the waste gas, which are then discharged through the liquid outlet pipe 11. Uncondensed gas is transported from the outlet 15 on the surface of the condenser pipe 10 to the adsorption tower 3 via a three-way pump 16. In the adsorption tower 3, activated carbon adsorption plates 4 adsorb and purify the organic pollutants in the waste gas. When the activated carbon is saturated, steam is generated by a steam generator 5, and hot air is provided by a hot air fan 6 for desorption and regeneration. The gas is then cooled by a cooling fan 7 to restore its adsorption capacity. The adsorption-treated waste gas enters the preheating chamber 8 through the working port 18. An electrically heated wire mesh 19 heats the waste gas to a suitable temperature before sending it into the reaction chamber 9. Inside the reaction chamber 9, the wave-shaped gas guide plate 20 guides the exhaust gas to flow evenly and come into full contact with the precious metal catalyst 22 on the honeycomb ceramic carrier 21. Under the action of the catalyst, the harmful substances in the exhaust gas undergo catalytic oxidation reaction and are eventually converted into harmless carbon dioxide and water and other substances for discharge.

[0027] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A waste gas treatment device for polyurethane resin production, characterized in that: The device includes a condenser (1), an air inlet (2) at the top of the condenser (1), a plurality of adsorption towers (3) on one side of the condenser (1), a plurality of activated carbon adsorption plates (4) movably arranged on the inner wall of the adsorption towers (3), a steam generator (5) at the bottom of the inner wall of the adsorption towers (3), a hot air fan (6) fixedly arranged at the bottom of the inner wall of the adsorption towers (3), a cooling fan (7) fixedly arranged at the bottom of the inner wall of the adsorption towers (3), the steam generator (5) is arranged in parallel with the hot air fan (6) and the cooling fan (7), and is parallel to the plurality of activated carbon adsorption plates (4), a preheating chamber (8) is connected to one side of the adsorption towers (3), and a reaction chamber (9) is connected to the other side of the preheating chamber (8).

2. The waste gas treatment device for polyurethane resin production according to claim 1, characterized in that: The inner wall of the condensing chamber (1) is fixedly provided with a condensing pipe (10), which is connected to the air inlet (2). The condensing pipe (10) extends downward in a spiral shape, and a liquid outlet pipe (11) is opened on one side of the bottom end of the condensing pipe (10).

3. The waste gas treatment device for polyurethane resin production according to claim 1, characterized in that: A cooling nozzle (12) is fixedly installed at the top of the inner wall of the condensing chamber (1), and a cooling water tank (13) is fixedly installed on the outer side of the condensing chamber (1). The water tank is connected to the cooling nozzle (12) via pipeline. A return groove (14) is opened at the bottom of the inner wall of the condensing chamber (1), and the return groove (14) is connected to the cooling water tank (13) via pipeline.

4. The waste gas treatment device for polyurethane resin production according to claim 2, characterized in that: The surface of the condenser tube (10) is provided with several air outlets (15). A three-way pump (16) is fixedly installed on the outside of the condenser tube (10). The three-way pump (16) is connected to the air outlet (15) through a pipeline. The other side of the three-way pump (16) is connected to the air inlet pipeline of the adsorption tower (3).

5. The waste gas treatment device for polyurethane resin production according to claim 4, characterized in that: An exhaust pump (17) is provided at the top of the adsorption tower (3), and an operating port (18) is provided at the top of the adsorption tower (3). The operating port (18) is connected to the preheating chamber (8) via pipeline.

6. The waste gas treatment device for polyurethane resin production according to claim 5, characterized in that: The inner wall of the preheating chamber (8) is fixedly provided with several sets of electric heating wire mesh (19), and the inner walls of the reaction chamber (9) are fixedly provided with several wavy gas guide plates (20).

7. The waste gas treatment device for polyurethane resin production according to claim 6, characterized in that: The inner wall of the reaction chamber (9) is fixedly provided with a number of honeycomb-shaped ceramic carriers (21), which are parallel to each other, and a noble metal catalyst (22) is fixedly provided on the inner wall.

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