Ethylene glycol production off-gas treatment device

Abstract

The utility model belongs to waste gas treatment technical field relates to a kind of ethylene glycol production waste gas treatment devices. Including air suction pipe, dehumidification cavity, enrichment cavity, reaction chamber and exhaust pipe;Fan is installed on the air suction pipe;Dehumidification cavity one end with the air outlet of the air suction pipe is communicated, and the other end is communicated with enrichment cavity;And cooling plate is arranged in the dehumidification cavity;Enrichment cavity is provided with rack, and the rack is placed with activated carbon;Enrichment cavity and the reaction chamber are communicated;One end of the exhaust pipe is inserted into the reaction chamber, and the other end is extended outward and is connected with exhaust passage;Exhaust pipe outer wall that is inserted into the reaction chamber is provided with fixing ring, heating pipe is installed on the fixing ring, and catalyst is placed on the fixing ring. Realized the integration treatment of ethylene glycol waste gas efficient purification and harmful component resource recovery, with economy and environmental friendliness.

Description

Technical Field

[0001] This utility model belongs to the field of waste gas treatment technology and relates to a waste gas treatment device for ethylene glycol production. Background Technology

[0002] Ethylene glycol is a colorless, transparent, sweet-tasting, hygroscopic viscous liquid, and an important chemical raw material and solvent. It is mainly used in the production of polyester fibers, antifreeze, hydraulic fluids, surfactants, resins, and plasticizers. Due to its good solubility and low freezing point, ethylene glycol is widely used in many industries.

[0003] Coal-to-ethylene glycol production typically involves steps such as gasification, syngas purification, catalytic synthesis, and refining. In particular, during the refining stage, ethylene glycol needs to be purified through heating distillation or other separation methods. At this stage, the temperature is relatively high, which causes the ethylene glycol to evaporate and produce ethylene glycol vapor. The problem is that ethylene glycol vapor is a volatile organic compound (VOC) waste gas, and direct emission would cause environmental pollution. Therefore, ethylene glycol vapor needs to be rendered harmless before it can be released.

[0004] Currently, common methods for treating ethylene glycol waste gas include condensation recovery, adsorption, absorption, thermal incineration, and catalytic oxidation. However, existing technologies still have many limitations: for example, single condensation methods have low recovery efficiency for low-concentration waste gas and high energy consumption; although adsorption methods can effectively enrich organic matter, adsorbents (such as activated carbon) are easily affected by moisture in the waste gas, reducing their adsorption capacity, and the regeneration or disposal process after adsorption saturation is complex, posing a risk of secondary pollution; direct thermal incineration consumes a large amount of fuel, resulting in high operating costs and potentially generating byproducts such as nitrogen oxides; while catalytic oxidation technology has a lower reaction temperature, if the waste gas has a high moisture content or contains catalyst poisons, it can easily lead to catalyst deactivation or a decrease in reaction efficiency. Utility Model Content

[0005] To address the problems of low efficiency in ethylene glycol waste gas treatment, difficulty in resource recovery, and risk of secondary pollution in existing technologies, this utility model provides an ethylene glycol production waste gas treatment device that achieves integrated treatment of efficient purification of ethylene glycol waste gas and resource recovery of harmful components, which is both economical and environmentally friendly.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: This utility model provides a waste gas treatment device for ethylene glycol production, including an intake pipe, a dehumidification chamber, an enrichment chamber, a reaction chamber, and an exhaust pipe; a fan is installed on the intake pipe; one end of the dehumidification chamber is connected to the outlet of the intake pipe, and the other end is connected to the enrichment chamber; a cooling plate is provided inside the dehumidification chamber; a shelf is provided inside the enrichment chamber, and activated carbon is placed on the shelf; the enrichment chamber and the reaction chamber are connected; one end of the exhaust pipe extends into the reaction chamber, and the other end extends outward and connects to the exhaust duct; a fixing ring is arranged around the outer wall of the exhaust pipe extending into the reaction chamber, a heating pipe is installed on the fixing ring, and a catalyst is placed on the fixing ring.

[0007] Preferably, an air intake hood is provided at the air inlet of the air intake pipe.

[0008] Preferably, the air intake hood is equipped with a filter screen.

[0009] Preferably, the cooling plate is inclined downward on both sides, and a water collection trough is provided at the lower edge of both sides of the cooling plate.

[0010] Preferably, the cooling plate is provided with a cooling pipe.

[0011] Preferably, the inner diameter of the dehumidification chamber is smaller than the inner diameter of the enrichment chamber.

[0012] Preferably, the placement rack has a multi-layer drawer structure, with the bottom of each layer of the placement rack being a perforated plate, and the side wall of the enrichment cavity having a movable door corresponding to the position of each layer of the placement rack.

[0013] Preferably, an ultrasonic oscillator is provided inside the enrichment cavity.

[0014] Preferably, a temperature sensor is installed in the reaction chamber.

[0015] Preferably, the catalyst is a platinum, palladium, or aluminum-cerium composite metal oxide catalyst.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention effectively draws in and transports waste gas through a suction pipe and fan. Moisture is removed by condensation on a cooling plate in the dehumidification chamber, reducing interference from subsequent adsorption. Activated carbon in the enrichment chamber efficiently adsorbs and enriches ethylene glycol vapors. In the reaction chamber, heating pipes and a catalyst surrounding the exhaust pipe achieve catalytic oxidation and decomposition of ethylene glycol at a suitable temperature. Finally, harmless products are discharged through the exhaust pipe and exhaust duct. This invention achieves integrated treatment of highly efficient ethylene glycol waste gas purification and resource recovery of harmful components, significantly improving the economic efficiency and environmental friendliness of the equipment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the ethylene glycol production waste gas treatment device of this utility model; Figure 2 for Figure 1 Side view; Figure 3 for Figure 1 A bottom view; Figure 4 This is a schematic cross-sectional view of the dehumidification chamber and enrichment chamber of the ethylene glycol production waste gas treatment device of this utility model; Figure 5 This is a schematic cross-sectional view of the reaction chamber of the ethylene glycol production waste gas treatment device of this utility model.

[0019] The components are: 1. Suction hood; 2. Fan; 3. Suction pipe; 4. Cooling pipe; 5. Dehumidification chamber; 6. Enrichment chamber; 7. Cooling plate; 8. Water collection tank; 9. Heating pipe; 10. Placement rack; 11. Reaction chamber; 12. Filter screen; 13. Exhaust duct; 14. Exhaust pipe; 15. Fixing ring. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the 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, and therefore should not be construed as a limitation on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] The present invention will now be described in further detail with reference to the accompanying drawings: This utility model provides a device for treating waste gas from ethylene glycol production, such as... Figures 1-5 As shown, the system includes an intake pipe 3, a dehumidification chamber 5, an enrichment chamber 6, a reaction chamber 11, and an exhaust pipe 14. A fan 2 is installed on the intake pipe 3. One end of the dehumidification chamber 5 is connected to the outlet of the intake pipe 3, and the other end is connected to the enrichment chamber 6. A cooling plate 7 is installed inside the dehumidification chamber 5. A placement rack 10 is installed inside the enrichment chamber 6, and activated carbon is placed on the placement rack 10. The enrichment chamber 6 is connected to the reaction chamber 11. One end of the exhaust pipe 14 extends into the reaction chamber 11, and the other end extends outward and connects to the exhaust duct 13. A fixing ring 15 is arranged around the outer wall of the exhaust pipe 14 extending into the reaction chamber 11. A heating pipe 9 is installed on the fixing ring 15, and a catalyst is placed on the fixing ring 15.

[0027] The operation of the ventilator 2 in this invention creates a negative pressure in the suction pipe 3, drawing ethylene glycol vapor waste gas into the suction pipe 3. The gas then enters the dehumidification chamber 5 through the suction pipe 3. The cooling plate 7 inside the dehumidification chamber 5 effectively condenses and removes moisture from the waste gas, reducing humidity. Water molecules compete with ethylene glycol for adsorption sites on the activated carbon surface. The cooling plate 7 dehumidifies the ethylene glycol vapor (cooling the gas causes water vapor in the ethylene glycol vapor to liquefy, reducing the water content), improving the adsorption and enrichment effect of the activated carbon on ethylene glycol. The dehumidified waste gas enters the enrichment chamber 6, where activated carbon is placed on the rack 10. The activated carbon is porous, and its porous structure allows for physical adsorption and enrichment of the ethylene glycol vapor waste gas. Ethylene glycol molecules contain two hydroxyl groups (-OH), exhibiting strong polarity, which mutually adsorbs with oxygen-containing functional groups (such as carboxyl and hydroxyl groups) on the surface of the activated carbon. The remaining gas that fails to be adsorbed then enters the reaction chamber 11. On the fixed ring 15 surrounding the exhaust pipe 14, the heating tube 9 provides the temperature required for the catalytic reaction. The catalyst loaded on it can efficiently promote the deep catalytic oxidation of pollutants such as ethylene glycol, which is eventually decomposed into harmless carbon dioxide and water, and safely discharged through the exhaust pipe 14 and exhaust duct 13. The entire system integrates dehumidification, adsorption enrichment and catalytic purification functions. It has a compact structure and significant synergistic effect. It not only effectively removes pollutants from the exhaust gas and achieves emission standards, but also takes into account the potential for resource recovery, and has dual benefits of environmental protection and economy.

[0028] The catalysts used are platinum, palladium, or aluminum-cerium composite metal oxide catalysts. Noble metal catalysts such as platinum and palladium exhibit excellent low-temperature catalytic activity, which can efficiently promote the deep oxidation of ethylene glycol; while aluminum-cerium composite metal oxide catalysts have good anti-sintering properties, high mechanical strength, and cost advantages, making them particularly suitable for high-temperature reaction environments.

[0029] In one embodiment of this utility model, an air intake hood 1 is provided at the air inlet of the air intake pipe 3. The air intake hood 1 can expand the air intake cross section for ethylene glycol vapor, thereby increasing the amount of ethylene glycol vapor absorbed by the air intake pipe 3. Furthermore, a filter screen 12 is provided inside the air intake hood 1 to perform preliminary filtration of the inhaled ethylene glycol vapor, preventing suspended impurities from being drawn into the air intake pipe 3 and maintaining the smooth flow of the air intake pipe 3.

[0030] In one embodiment of this utility model, the cooling plate 7 is inclined downwards on both sides, and a water collection tank 8 is provided at the lower edge of both sides of the cooling plate 7. The water droplets generated by condensation can quickly slide down the inclined surface and collect in the water collection tank 8, effectively avoiding the accumulation of condensate on the cooling surface and affecting the continuous heat exchange efficiency, while facilitating centralized recycling of water resources. A cooling pipe 4 is provided inside the cooling plate 7, and heat exchange is carried out through the coolant in the cooling pipe 4 to reduce the temperature of the cooling plate 7.

[0031] In one embodiment of this utility model, the inner diameter of the dehumidification chamber 5 is smaller than the inner diameter of the enrichment chamber 6, so that when ethylene glycol vapor flows from the dehumidification chamber 5 into the enrichment chamber 6, the flow cross-section of the enrichment chamber 6 is larger than that of the dehumidification chamber 5, which slows down the ethylene glycol vapor velocity in the enrichment chamber 6, increases the contact time between the activated carbon on the placement rack 10 and the ethylene glycol vapor, and makes the activated carbon absorb ethylene glycol more fully.

[0032] In one embodiment of this invention, the placement rack 10 has a multi-layer drawer-type structure, with a perforated plate at the bottom of each layer to ensure sufficient and uniform contact between the waste gas and the activated carbon, effectively improving adsorption efficiency. Furthermore, the enrichment chamber 6 has movable doors on the side walls corresponding to the positions of each layer of the placement rack 10. This invention allows operators to independently remove and replace the activated carbon in any layer without interrupting overall operation, significantly simplifying the loading, unloading, regeneration, or replacement process of the adsorbent.

[0033] In one embodiment of this invention, an ultrasonic oscillator is provided in the enrichment cavity 6. The ultrasonic cavitation effect can enhance the mass transfer and diffusion process of ethylene glycol molecules into the pores of activated carbon, improve the adsorption kinetics, and increase the enrichment efficiency and processing throughput.

[0034] In one embodiment of this utility model, a temperature sensor is provided in the reaction chamber 11. This device can provide real-time feedback on the temperature status in the reaction chamber 11, providing a basis for the power of the heating tube 9, thereby ensuring that the reaction is always in the optimal and stable reaction temperature range (250~400℃), effectively avoiding the problems of catalyst sintering and deactivation caused by excessively high temperature or incomplete reaction caused by excessively low temperature.

[0035] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for treating waste gas from ethylene glycol production, characterized in that, It includes an intake pipe (3), a dehumidification chamber (5), an enrichment chamber (6), a reaction chamber (11), and an exhaust pipe (14). A fan (2) is installed on the suction pipe (3); one end of the dehumidification chamber (5) is connected to the outlet of the suction pipe (3), and the other end is connected to the enrichment chamber (6); a cooling plate (7) is provided in the dehumidification chamber (5); a placement rack (10) is provided in the enrichment chamber (6), and activated carbon is placed on the placement rack (10); the enrichment chamber (6) is connected to the reaction chamber (11); one end of the exhaust pipe (14) extends into the reaction chamber (11), and the other end extends outward and connects to the exhaust channel (13); a fixing ring (15) is arranged around the outer wall of the exhaust pipe (14) extending into the reaction chamber (11), a heating pipe (9) is installed on the fixing ring (15), and a catalyst is placed on the fixing ring (15).

2. The ethylene glycol production waste gas treatment device according to claim 1, characterized in that, An air intake hood (1) is provided at the air inlet of the air intake pipe (3).

3. The ethylene glycol production waste gas treatment device according to claim 2, characterized in that, A filter screen (12) is provided inside the air intake hood (1).

4. The ethylene glycol production waste gas treatment device according to claim 1, characterized in that, The cooling plate (7) is inclined downward on both sides, and a water collection trough (8) is provided at the lower edge of both sides of the cooling plate (7).

5. The ethylene glycol production waste gas treatment device according to claim 4, characterized in that, The cooling plate (7) is provided with a cooling pipe (4).

6. The ethylene glycol production waste gas treatment device according to claim 1, characterized in that, The inner diameter of the dehumidification chamber (5) is smaller than the inner diameter of the enrichment chamber (6).

7. The ethylene glycol production waste gas treatment device according to claim 1, characterized in that, The placement rack (10) has a multi-layer drawer structure. The bottom of each layer of the placement rack (10) is a perforated plate, and the side wall of the enrichment cavity (6) is provided with a movable door corresponding to the position of each layer of the placement rack (10).

8. The ethylene glycol production waste gas treatment device according to claim 1, characterized in that, An ultrasonic oscillator is installed inside the enrichment cavity (6).

9. The ethylene glycol production waste gas treatment device according to claim 1, characterized in that, A temperature sensor is installed inside the reaction chamber (11).

10. The ethylene glycol production waste gas treatment device according to claim 1, characterized in that, The catalyst is a platinum, palladium, or aluminum-cerium composite metal oxide catalyst.

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