Device for removing spinning oil in gas in acetone mixed gas pipeline

Abstract

The invention discloses a device for removing spinning oil in gas in an acetone mixed gas pipeline, which comprises two sections of acetone mixed gas recovery pipelines, a heat exchange assembly is communicated between the two sections of acetone mixed gas recovery pipelines, and the heat exchange assembly is used for cooling the gas in the acetone mixed gas recovery pipelines to obtain oil-containing cooling water. The heat exchange assembly is communicated with an oil-water separation assembly, and the oil-water separation assembly is used for carrying out oil-water separation on oil-containing cooling water. Relates to the technical field of production of acetate fiber tows through dry spinning, through the arrangement of a heat exchange assembly and an oil-water separation assembly, air in a high-temperature oil-containing gas pipeline is cooled to be below the gas dew point through the heat exchange assembly, so that oil-containing cooling water can be obtained, and oil-water separation is conducted through the oil-water separation assembly; the method successfully intercepts the spinning oil originally entrained in the air mixture, and prevents the spinning oil from influencing the adsorption activity of the activated carbon in the downstream adsorption bed.

Description

Technical Field

[0001] The invention relates to the technical field of producing acetate fiber bundles by dry spinning, and in particular to a device for removing spinning oil from gas in an acetone mixed gas pipeline. Background Art

[0002] Dry spinning is a main spinning method for chemical fibers, referred to as dry spinning. The characteristic of this method is that the spinning solution stream does not enter the coagulation bath, but enters the spinning tunnel. In the tunnel, the solvent in the spinning solution stream evaporates quickly under the action of the hot air flow, and the evaporated solvent vapor is taken away by the hot air flow. As the solvent gradually evaporates, the stock solution solidifies, and under the action of the winding tension, it stretches and becomes thinner to form primary fibers. This method is suitable for those spinning solutions made of solvents with low boiling points and good solubility, which makes the spinning process relatively simple, and the mechanical properties of the resulting fibers are better than those of wet-spun fibers.

[0003] In the process of dry spinning to produce acetate fiber tow, high-temperature, high-volume air needs to be introduced into the drying section to remove the solvent acetone and moisture in the tow. In this process, the spinning oil used for lubrication and static elimination in the tow will be entrained into the acetone mixed gas recovery pipeline along with the high-temperature, high-volume air. If the mixed gas contains too much oil, it will seriously affect the adsorption activity of the activated carbon in the downstream adsorption bed, causing problems such as increased energy consumption, tail gas emissions and excessive COD in wastewater. Summary of the invention

[0004] In order to solve the technical problems existing in the background technology, the present invention proposes a device for removing spinning oil in the gas in the acetone mixed gas pipeline, which is used to solve the effect of oil volatilization on the downstream recovery section during the spinning and drying process.

[0005] The present invention provides a device for removing spinning oil from gas in an acetone mixed gas pipeline, comprising two sections of acetone mixed gas recovery pipelines, wherein a heat exchange component is connected between the two sections of the acetone mixed gas recovery pipelines, and the heat exchange component is used to cool the gas in the acetone mixed gas recovery pipeline to obtain oil-containing cooling water;

[0006] The heat exchange component is connected to an oil-water separation component, and the oil-water separation component is used to separate oil from water in the oil-containing cooling water.

[0007] Preferably, the heat exchange component includes an exhaust mechanism and a cooling box, the exhaust end of the exhaust mechanism is connected to one section of the acetone mixed gas recovery pipeline through a connecting pipe, the air outlet end of the exhaust mechanism is connected to the cooling box through a connecting pipe, a plurality of cooling pipes are installed in the cooling box, the side of the cooling box away from the fan is connected to another section of the acetone mixed gas recovery pipeline through a connecting pipe, and the oil-water separation component is connected to the cooling box through a connecting pipe.

[0008] Preferably, the air exhaust mechanism is a fan.

[0009] Preferably, the oil-water separation component is an oil-water separator.

[0010] A method for quantitatively detecting and removing spinning oil in gas in an acetone mixed gas pipeline comprises the following steps:

[0011] S1, extracting high-temperature oil-containing acetone-air mixed gas from the acetone mixed gas recovery pipeline through a fan, and passing it into the cooling box;

[0012] S2. Using the chilled water system in the dry spinning production, the chilled water system is connected to the cooling pipe, the cooling pipe generates heat exchange, and the high-temperature oil-containing acetone-air mixture is cooled to below the gas dew point, thereby obtaining oil-containing cooling water;

[0013] S3. The oil-containing cooling water passes through the oil-water separator. Due to the density difference between the oil and water, the high-density water will first pass through the oil-water separator and be discharged by gravity, while the oil will remain in the oil-water separator.

[0014] S4. By collecting the amount of oil discharged from the oil-water separator at the same time, and then calculating the COD value in the oil residual liquid by the standard potassium dichromate titration method, the oil content in the duct mixed gas can be quantitatively detected.

[0015] In the present invention, the proposed device for removing spinning oil from the gas in the acetone mixed gas pipeline has the following beneficial technical effects:

[0016] 1. Through the setting of heat exchange components and oil-water separation components, the heat exchange component cools the air in the high-temperature oil-containing gas pipeline to below the gas dew point, thereby obtaining oil-containing cooling water, and the oil-water separation component is used to separate the oil and water. This measure successfully intercepts the spinning oil originally entrained in the air mixture, preventing the spinning oil from affecting the adsorption activity of the activated carbon in the downstream adsorption bed.

[0017] 2. The method of quantitatively detecting and removing spinning oil in the gas in the acetone mixed gas pipeline of the present application is carried out on the basis of the existing dry spinning process. Therefore, the chilled water system in the dry spinning production can be used to connect the chilled water system with the cooling pipe, and the cooling pipe generates heat exchange, which reduces the equipment modification cost and avoids the high investment and complex engineering caused by the additional construction of the chilled water system. Moreover, the direct use of existing resources makes the implementation of the entire process more convenient and efficient, and can be quickly integrated into the existing production process without the need for large-scale production line adjustment and transformation.

[0018] 3. The method of the present application for quantitatively detecting and removing spinning oil in the gas in the acetone mixed gas pipeline collects the discharge amount of the oil in the oil-water separator at the same time, and then calculates the COD value in the oil residual liquid by the standard potassium dichromate titration method. The oil content in the duct mixed gas can be quantitatively detected, thereby determining the impact of changes in the upstream drying hot air temperature and flow process parameters on the volatilization of the oil.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the front view of the structure of the present invention.

[0021] In the figure, 1. Acetone mixed gas recovery pipeline; 2. Heat exchange component; 3. Oil-water separation component; 21. Exhaust mechanism; 22. Cooling box; 23. Cooling pipe. DETAILED DESCRIPTION

[0022] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0023] like Figure 1 The device shown is for removing spinning oil from gas in an acetone mixed gas pipeline, comprising two sections of acetone mixed gas recovery pipelines, wherein a heat exchange component 2 is connected between the two sections of acetone mixed gas recovery pipelines 1, and the heat exchange component 2 is used to cool the gas in the acetone mixed gas recovery pipeline 1 to obtain oil-containing cooling water;

[0024] The heat exchange component 2 is connected to an oil-water separation component 3, and the oil-water separation component 3 is used to separate oil from water in the oil-containing cooling water.

[0025] In an optional embodiment, the two sections of the acetone mixed gas recovery pipeline 1 are connected, and a one-way valve is installed at the connection of the two sections of the acetone mixed gas recovery pipeline 1. Therefore, when the heat exchange component 2 and the oil-water separation component 3 are not working, the original single pipeline mode of recovering the high-temperature acetone mixed gas in the factory's existing technology can be restored.

[0026] In an optional embodiment, the heat exchange component 2 includes an exhaust mechanism 21 and a cooling box 22, the exhaust end of the exhaust mechanism 21 is connected to one section of the acetone mixed gas recovery pipeline 1 through a connecting pipe, the air outlet end of the exhaust mechanism 21 is connected to the cooling box 22 through a connecting pipe, a plurality of cooling pipes 23 are installed in the cooling box 22, the side of the cooling box 22 away from the fan is connected to another section of the acetone mixed gas recovery pipeline 1 through a connecting pipe, and the oil-water separation component 3 is connected to the cooling box 22 through a connecting pipe.

[0027] In an optional embodiment, the exhaust mechanism 21 is a fan, and the fan can be a centrifugal fan. The fan meets certain explosion-proof requirements, and the rated air volume is the same as that of the acetone mixed gas recovery pipeline 1.

[0028] In an optional embodiment, the exhaust mechanism 21 can be replaced by other existing exhaust structures that can achieve exhaust.

[0029] In an optional embodiment, the oil-water separation component 3 is an oil-water separator.

[0030] In an optional embodiment, the oil-water separation component 3 can be replaced by other existing oil-water separation structures that can achieve oil-water separation.

[0031] This application has the following features:

[0032] High flexibility: The use of this device does not affect the normal operation of the main process. All cold and hot materials can be isolated from the hot air and chilled water pipelines through the isolation valves at the corresponding positions;

[0033] High efficiency: This device obtains oil-containing coolant through precise measurement and analysis of the materials to be processed, accurate theoretical analysis and calculation, and reasonable introduction of cold and hot material flows and selection of heat exchangers in the limited space on site, thereby maximizing the utilization of space, equipment and materials.

[0034] Stability and reliability: The fan, heat exchanger and oil-water separation component 3 selected for this device can operate continuously without interruption. Chilled water and oil-containing hot air are both necessary materials for continuous production in the factory. The whole set of equipment can ensure long-term stable operation.

[0035] Quantitative detection: This device collects and detects the COD content of the oil agent in the mixed gas at the same time to accurately calculate the oil agent content in the mixed gas.

[0036] Guiding the production process: By quantitatively detecting the oil content in the mixed gas within a certain period of time, the influence of changes in the upstream drying hot air temperature and flow process parameters on the volatilization of the oil can be determined.

[0037] In summary, the present invention provides a highly flexible, efficient, stable and reliable method for removing and detecting spinning oil in a gas pipeline, and collects and detects changes in the oil content to guide front-end process adjustments.

[0038] A method for quantitatively detecting and removing spinning oil in gas in an acetone mixed gas pipeline comprises the following steps:

[0039] S1, extracting high-temperature oil-containing acetone-air mixture from the acetone mixed gas recovery pipeline 1 through a blower, and passing it into the cooling box 22;

[0040] S2, using the chilled water system in the dry spinning production, connecting the chilled water system with the cooling pipe 23, the cooling pipe 23 generates heat exchange, and cools the high-temperature oil-containing acetone-air mixture to below the gas dew point, thereby obtaining oil-containing cooling water;

[0041] Dew point is the dew point temperature Td. When the water vapor content in the air remains unchanged and the air pressure is kept constant, the temperature when the air is cooled to saturation is called the dew point temperature, or dew point for short, and is expressed in ℃ or ℉.

[0042] S3. The oil-containing cooling water passes through the oil-water separator. Due to the density difference between the oil and water, the high-density water will first pass through the oil-water separator and be discharged by gravity, while the oil will remain in the oil-water separator.

[0043] S4. By collecting the amount of oil discharged from the oil-water separator at the same time, and then calculating the COD value in the oil residual liquid by the standard potassium dichromate titration method, the oil content in the duct mixed gas can be quantitatively detected.

[0044] COD refers to the chemical oxygen demand, which is the amount of oxidant consumed when a water sample is treated with a certain strong oxidant under certain conditions, expressed in milligrams of oxygen per liter. It uses chemical oxidants to oxidize the reducing substances in the water sample, and then calculates the oxygen consumption from the remaining amount of oxidant.

[0045] The present invention aims to introduce a convenient and efficient heat exchange component 2 and an oil-water separation component 3 in the daily production of the factory, on the premise of not affecting the continuous production, on the theoretical basis of material and heat balance of a specific chemical process, so as to successfully intercept the spinning oil entrained in the air mixture. On the one hand, it verifies the influence of process factors such as hot air temperature and hot air flow rate in the drying process on the volatilization of the oil. On the other hand, by optimizing the front-end process, it effectively solves the serious influence of the volatilization of the spinning oil on the activity of the activated carbon in the adsorption bed, which has long plagued the factory.

[0046] The present invention relates to a device capable of quantitatively detecting and removing spinning oil in the gas in an acetone mixed gas (SLA) pipeline. The device introduces a heat exchange component 2 into a spinning high-temperature gas recovery air duct, connects the chilled water system with a cooling pipe 23 through a chilled water system in dry spinning production, uses low-temperature chilled water as a cooling medium, cools the air in the high-temperature oil-containing gas pipeline in a cooling box 22 to below the gas dew point, thereby obtaining oil-containing cooling water, and performs oil-water separation through an oil-water separation component 3, and quantitatively detects the content of the oil in the SLA gas recovery pipeline offline, and can also be used to timely check and adjust the process changes of the front-end drying section.

[0047] Through the arrangement of the heat exchange component 2 and the oil-water separation component 3, the heat exchange component 2 cools the air in the high-temperature oil-containing gas pipeline to below the gas dew point, thereby obtaining oil-containing cooling water, and the oil-water separation component 3 is used to separate the oil and water. This measure successfully intercepts the spinning oil originally entrained in the air mixture, and not only that, it also plays a key role in the following two important aspects:

[0048] On the one hand, through precise experiments and monitoring, the specific effects of process factors such as hot air temperature and hot air flow rate on the volatilization of spinning oil during the drying process were verified. This provides solid data support and theoretical basis for optimizing the drying process, which helps to more accurately control the production process and improve product quality and production efficiency.

[0049] On the other hand, through careful optimization of the front-end process, the problem that has long plagued the factory, namely the serious impact on the activity of activated carbon in the adsorption bed caused by the volatilization of spinning oil, has been effectively solved. This improvement has greatly reduced energy consumption and avoided energy waste caused by reduced activated carbon activity. At the same time, it has significantly reduced tail gas emissions, making the factory's production process more environmentally friendly and in line with increasingly stringent environmental standards. In addition, the problem of excessive COD in wastewater has been successfully controlled, effectively avoiding environmental risks and legal liabilities that may be caused by substandard wastewater treatment, and providing strong guarantees for the sustainable development of the factory.

[0050] In general, the present invention brings about comprehensive improvements and upgrades to the process of producing acetate fiber tow by dry spinning through innovative devices and optimized processes, and has important industrial application value and social and environmental benefits.

[0051] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0052] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0053] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0056] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for removing spinning oil from gas in an acetone mixed gas pipeline, comprising two sections of acetone mixed gas recovery pipelines (1), characterized in that: A heat exchange component (2) is connected between the two sections of the acetone mixed gas recovery pipeline (1), and the heat exchange component (2) is used to cool the gas in the acetone mixed gas recovery pipeline (1) to obtain oil-containing cooling water; The heat exchange component (2) is connected to an oil-water separation component (3), and the oil-water separation component (3) is used to separate oil from water in oil-containing cooling water.

2. The device for removing spinning oil from gas in an acetone mixed gas pipeline according to claim 1, characterized in that: The heat exchange component (2) comprises an exhaust mechanism (21) and a cooling box (22); the exhaust end of the exhaust mechanism (21) is connected to one section of the acetone mixed gas recovery pipeline (1) through a connecting pipe; the air outlet end of the exhaust mechanism (21) is connected to the cooling box (22) through a connecting pipe; a plurality of cooling pipes (23) are installed in the cooling box (22); a side of the cooling box (22) away from the fan is connected to another section of the acetone mixed gas recovery pipeline (1) through a connecting pipe; and the oil-water separation component (3) is connected to the cooling box (22) through a connecting pipe.

3. The device for removing spinning oil from gas in an acetone mixed gas pipeline according to claim 2, characterized in that: The air exhaust mechanism (21) is a fan.

4. The device for removing spinning oil from gas in an acetone mixed gas pipeline according to claim 1, characterized in that: The oil-water separation component (3) is an oil-water separator.

5. A method for quantitatively detecting and removing spinning oil in the gas in the acetone mixed gas pipeline according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1, extracting high-temperature oil-containing acetone-air mixed gas from the acetone mixed gas recovery pipeline (1) through a blower, and passing the mixed gas into a cooling box (22); S2, using the chilled water system in the dry spinning production, connecting the chilled water system with the cooling pipe (23), the cooling pipe (23) generates heat exchange, and cools the high-temperature oil-containing acetone-air mixture to below the gas dew point, thereby obtaining oil-containing cooling water; S3. The oil-containing cooling water passes through the oil-water separator. Due to the density difference between the oil and water, the high-density water will first pass through the oil-water separator and be discharged by gravity, while the oil will remain in the oil-water separator. S4. By collecting the amount of oil discharged from the oil-water separator at the same time, and then calculating the COD value in the oil residual liquid by the standard potassium dichromate titration method, the oil content in the duct mixed gas can be quantitatively detected.

Images