Polyester production device

Abstract

The embodiment of the utility model provides a polyester production device, and relates to the technical field of polyester production. The polyester production device comprises a closed pipeline which comprises a feeding pipe, a slicing pipe and a discharging pipe; the connecting pipe is connected with the steam pipeline, and the drain pipeline is connected with the steam pipeline; in the cleaning mode, the drainage pipeline is used for discharging accumulated water in the steam pipeline; the connecting pipe is connected with the closed pipeline so that steam in the steam pipeline can be conveyed into the closed pipeline. According to the embodiment, residual materials in the closed pipeline can be cleaned, it can be guaranteed that no residual materials exist in the closed pipeline when the closed pipeline is put into production again, and therefore the product quality is prevented from being damaged.

Description

Technical Field

[0001] This disclosure relates to the field of polyester production technology, and in particular to a polyester production apparatus. Background Technology

[0002] In polyester production, esterification and polycondensation reactions yield high-temperature, high-viscosity polyester melt. Depending on the requirements, this melt can be sliced ​​or directly spun. Related technologies typically include a closed pipeline, a pelletizer, a discharge plate, and pumps in the production equipment for preparing polyester melt into slices. The pumps and closed pipelines transport the polyester melt, while the pelletizer slices it. However, during the discharge process, material residue can easily accumulate in the closed pipeline. This residue can lead to uneven material distribution in subsequent production, resulting in compromised product quality. Utility Model Content

[0003] This disclosure provides a polyester production apparatus to overcome the problem that material residue in closed pipelines can lead to product quality degradation.

[0004] This disclosure provides a polyester production apparatus, comprising: a closed pipeline, the closed pipeline including an inlet pipe, a slicing pipe, and an outlet pipe; a steam pipeline, a drain pipe, and a connecting pipe, the connecting pipe being connected to the steam pipeline, and the drain pipe being connected to the steam pipeline; in a cleaning mode, the drain pipe is used to drain accumulated water in the steam pipeline; the connecting pipe is connected to the closed pipeline to transport steam from the steam pipeline to the closed pipeline.

[0005] In some embodiments, the sealed pipeline further includes a first control valve installed in the slicing tube. The first control valve is also used to connect to the connecting pipe in cleaning mode, so that steam supplied by the steam pipeline can enter the sealed pipeline through the first control valve.

[0006] In some embodiments, the first control valve includes: a valve body, a valve stem, and a discharge pipe; the valve body is installed in the slicing pipe, one end of the valve stem is installed in the valve body, and the other end of the valve stem has a handwheel; in cleaning mode, one end of the discharge pipe is connected to the valve body, and the other end of the discharge pipe is detachably connected to the connecting pipe, so that steam provided by the steam pipe can enter the closed pipe through the first control valve; in working mode, the end of the discharge pipe away from the valve body is detachably connected to a blind flange, which is used to block the discharge pipe.

[0007] In some embodiments, the end of the discharge pipe away from the valve body has a first flange connection; the end of the connecting pipe facing the discharge pipe has a second flange connection; in cleaning mode, the first flange connection is connected to the second flange connection, and the first flange connection and the second flange connection are sealed by a metal gasket; in working mode, the first flange connection is sealed to the blind plate.

[0008] In some embodiments, the first control valve includes a jacketed valve.

[0009] In some embodiments, the steam pipeline includes: a steam pipe, a main valve, and a second control valve. The steam pipe is used for connecting steam equipment and is connected to the connecting pipe. The main valve and the second control valve are installed in the steam pipe. The main valve is further away from the connecting pipe than the second control valve. The main valve is used to control the on / off state of the steam pipeline, and the second control valve is used to regulate the flow rate of the steam pipeline. The portion of the steam pipe located between the main valve and the second control valve is connected to the drain pipe.

[0010] In some embodiments, the drain pipe includes a drain pipe, a drain valve, and a steam trap, wherein the drain valve and the steam trap are installed in the drain pipe, and the steam trap is located further away from the steam pipe than the drain valve.

[0011] In some embodiments, the connecting pipe includes a metal flexible tube or a stainless steel rigid tube.

[0012] In some embodiments, the sealed pipeline further includes a first three-way valve and a second three-way valve, the first three-way valve being connected between the feed pipe and the slicing pipe, the second three-way valve being connected between the slicing pipe and the discharge pipe, and the second three-way valve being connected to the two discharge pipes respectively.

[0013] In some embodiments, the sealed conduit further includes a spinning tube connected to the first three-way valve.

[0014] The polyester production apparatus provided in this embodiment, when the polyester production apparatus is not in operation, that is, in cleaning mode, uses a condensate drain pipe to drain the water accumulated in the steam pipe, and uses the steam pipe and connecting pipe to transport steam to the closed production pipe, so that the steam can be used to hydrolyze the residual material in the closed pipe, thereby cleaning the residual material in the closed pipe, which helps to ensure that there is no residual material in the closed pipe when production is restarted, and thus avoids damage to product quality.

[0015] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this disclosure will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0016] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this disclosure and should not be construed as limiting the scope of this disclosure.

[0017] Figure 1 A schematic diagram of a polyester production apparatus according to an embodiment of the present disclosure is shown;

[0018] Figure 2 A schematic diagram of the structure of a closed pipe according to an embodiment of the present disclosure is shown;

[0019] Figure 3 A schematic diagram of an online steam hydrolysis mechanism according to an embodiment of the present disclosure is shown;

[0020] Figure 4 A schematic diagram of the structure of an online steam hydrolysis mechanism according to another embodiment of the present disclosure is shown;

[0021] Figure 5 A schematic diagram showing the connection between the first control valve and the slicing tube according to an embodiment of the present disclosure is provided.

[0022] Explanation of reference numerals in the attached drawings: 100-Sealed pipe; 110-Infeed pipe; 120-Slicing pipe; 130-Discharge pipe; 140-First three-way valve; 150-Second three-way valve; 160-First control valve; 161-Valve body; 162-Valve stem; 163-Discharge pipe; 170-Spinning tube; 200-Online steam hydrolysis mechanism; 210-Steam pipe; 211-Steam pipe; 212-Main valve; 213-Second control valve; 220-Connecting pipe; 221-Metal flexible hose; 222-Stainless steel rigid pipe; 230-Drainage pipe; 231-Drainage pipe; 232-Drain valve; 233-Drainage device. Detailed Implementation

[0023] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this disclosure. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0024] In related technologies, during the discharge of materials such as polyester melt, material residue can easily accumulate on the walls, bends, dead corners, and low points of closed pipes. When the production unit is restarted, new material enters, and the residual material is carried along with it, causing uneven material distribution and ultimately damaging product quality, leading to the downgrading of a large number of products.

[0025] To overcome the above problems, this embodiment provides a polyester production apparatus that, after being shut down, can enter a cleaning mode. It uses a condensate drain to drain the water from the steam pipe and uses the steam pipe and connecting pipe to supply steam to the closed production pipe. The steam is used to hydrolyze the residual material in the closed pipe, thereby cleaning the residual material in the closed pipe. This ensures that there is no residual material in the closed pipe when the polyester production apparatus is put back into operation, thus avoiding damage to product quality.

[0026] Figure 1 A schematic diagram of the piping of a polyester production apparatus according to an embodiment of the present disclosure is shown; Figure 2 A schematic diagram of a closed conduit according to an embodiment of the present disclosure is shown.

[0027] Please refer to Figure 1 and Figure 2 The polyester production apparatus provided in this embodiment includes a closed pipeline 100 and an online steam hydrolysis mechanism 200. The closed pipeline 100 includes a feed pipe 110, a slicing pipe 120, a discharge pipe 130, and multiple valves. The feed pipe 110, the slicing pipe 120, and the discharge pipe 130 each include at least one pipe section. The valves are used to connect adjacent pipe sections.

[0028] The polyester production unit has at least two modes: a working mode and a cleaning mode. In the working mode, the closed pipeline 100 transports materials under the conveying force of the conveying pump.

[0029] The feed pipe 110, slicing pipe 120 and discharge pipe 130 in the closed pipeline 100 are connected in sequence to transport materials such as polyester melt.

[0030] The feed pipe 110 can be connected to the slicing pipe 120 via a valve. This valve can control the connection and disconnection between the feed pipe 110 and the slicing pipe 120, and can also control the material conveying by adjusting the valve opening.

[0031] In some examples, the feed pipe 110 can be connected to the slicing pipe 120 via a first three-way valve 140, which can be used to transport materials to the slicing process station. The feed pipe 110 can also be connected to the spinning tube 170 via the same first three-way valve 140, which can be used to transport materials supplied by the feed pipe 110 to the spinning process station. One connector of the first three-way valve 140 can be inserted into the slicing pipe 120, another connector can be inserted into the spinning tube 170, and yet another connector can be used to insert the feed pipe 110. Specifically, the first three-way valve 140 can be manipulated to connect the feed pipe 110 to the slicing pipe 120, or to the spinning tube 170.

[0032] In other examples, one connector of the first three-way valve 140 can be inserted into the slicing tube 120, another connector of the first three-way valve 140 can be inserted into the spinning tube 170, and yet another connector of the first three-way valve 140 can be inserted into the feed tube 110.

[0033] In other examples, the feed tube 110 may also be connected to the slicing tube 120 via a two-way valve, a check valve, or a regulating valve.

[0034] The end of the slicing tube 120 away from the feed tube 110 can be connected to the discharge tube 130 via a valve. The discharge tube 130 can be used to transport the sliced ​​material to the discharge plate. When there is only one discharge tube 130, the slicing tube 120 can be connected to the discharge tube 130 via a two-way valve, a one-way valve, or a regulating valve.

[0035] When there are two discharge pipes 130, the slicing tube 120 can be connected to both discharge pipes 130 via a second three-way valve 150. Two connectors of the second three-way valve 150 can be inserted into the two discharge pipes 130 respectively, and the other connector of the second three-way valve 150 can be inserted into the end of the slicing tube 120 opposite to the feed pipe 110. In specific implementation, the second three-way valve 150 can be operated to connect the slicing tube 120 to one of the discharge pipes 130, or to connect the slicing tube 120 to both discharge pipes 130 respectively.

[0036] In other examples, two of the connectors of the second three-way valve 150 can be inserted into two discharge pipes 130 respectively, and the other connector of the second three-way valve 150 can be inserted into the end of the slicing tube 120 opposite to the feed pipe 110.

[0037] In addition, when there are more discharge pipes 130, the valve can also be equipped with a corresponding number of connectors. The specific number of valve connectors can be set according to actual needs.

[0038] It is understood that the specific structure of the closed pipe 100 is not limited to this. For example, the closed pipe 100 may include more functional pipes and valves, and the specific structure of the closed pipe 100 can be set according to actual needs.

[0039] The online steam hydrolysis unit 200 can supply steam to the closed pipe 100 in cleaning mode, so that the steam entering the closed pipe 100 can hydrolyze the residual material.

[0040] Figure 3 A schematic diagram of the piping of an online steam hydrolysis mechanism according to an embodiment of the present disclosure is shown; Figure 4 A pipeline schematic diagram of an online steam hydrolysis mechanism according to another embodiment of the present disclosure is shown.

[0041] Please refer to Figures 1 to 4 The online steam hydrolysis mechanism 200 may include: a steam pipe 210, a drain pipe 230, and a connecting pipe 220. The connecting pipe 220 is connected to the steam pipe 210, and the drain pipe 230 is connected to the steam pipe 210. In cleaning mode, the drain pipe 230 is used to drain the water accumulated in the steam pipe 210; the connecting pipe 220 is used to connect to the closed pipe 100 to transport the steam in the steam pipe 210 to the closed pipe 100.

[0042] One end of the steam pipe 210 is used to connect to a steam equipment. The steam equipment is used to supply steam (or water vapor). The steam equipment can be on-site equipment. Steam is a commonly used heating medium in industrial production, and workshops are usually equipped with steam equipment to supply steam. The steam supplied by the steam equipment has a neutral chemical pH and will not corrode the closed pipe 100. During the cleaning process, the steam can also carry away the decomposed residual materials from the closed pipe 100.

[0043] Optionally, the steam pipe 210 can be detachably connected to the steam equipment. This allows the steam pipe 210 to be removed from the steam equipment when cleaning of the sealed pipe 100 is not required, without affecting the use of the steam equipment in other applications.

[0044] Connecting pipe 220 is primarily used to deliver steam supplied by steam pipe 210 to closed pipe 100 in cleaning mode. In some examples, such as Figure 3 As shown, the connecting pipe 220 includes a metal flexible hose 221, which can be applied to different installation scenarios, thereby improving the installation flexibility of the online steam hydrolysis mechanism 200. In other examples, such as Figure 4 As shown, the connecting pipe 220 may also include a stainless steel rigid pipe 222.

[0045] The drainage pipe 230 can be connected to the steam pipe 210 to drain the water accumulated in the steam pipe 210, so as to prevent the water accumulated in the steam pipe 210 from affecting the steam hydrolysis effect and thus affecting the cleaning effect.

[0046] In the polyester production apparatus of this embodiment, during operation, the apparatus is used for chip production, and the closed pipeline 100 is used for material transport. When the polyester production apparatus is shut down, it can enter a cleaning mode. First, the water accumulated in the steam pipeline 210 is drained using the drainage pipeline 230. Then, steam is supplied to the closed pipeline 100 via the steam pipeline 210 and the connecting pipe 220. The steam enters the closed pipeline 100 to decompose the residual material. The decomposed material can be discharged from the closed pipeline 100 via the discharge pipe 130 along with the steam, or it can be discharged from other outlets of the closed pipeline 100 along with the steam.

[0047] In the cleaning mode, the polyester production apparatus provided in this embodiment connects the steam pipe 210 to the closed pipe 100 via the connecting pipe 220. By setting up a drain pipe 230 connected to the steam pipe 210, the water accumulated in the steam pipe 210 is discharged through the drain pipe 230. Steam is then transported to the closed pipe 100 for production via the steam pipe 210 and the connecting pipe 220. This allows the steam to hydrolyze the residual materials in the closed pipe 100, thereby cleaning the residual materials in the closed pipe 100. This ensures that there are no residual materials in the closed pipe 100 when production resumes, thus avoiding damage to product quality.

[0048] In some embodiments, the closed conduit 100 further includes a first control valve 160, which is installed in the slicing tube 120 and connected to the connecting pipe 220. In cleaning mode, the first control valve 160 connects the closed conduit 100 to the connecting pipe 220, allowing steam supplied by the steam pipe 210 to enter the closed conduit 100 via the first control valve 160 and hydrolyze residual materials. In operating mode, the connecting pipe 220 cannot supply steam to the closed conduit 220.

[0049] The first control valve 160 can be installed in a section of the slicing tube 120 that is relatively close to the feed tube 110. For example, the first control valve 160 can be connected between two sections of the slicing tube 120 that are relatively close to the feed tube 110. Alternatively, the first control valve 160 can be connected between the slicing tube 120 and the first three-way valve 140. In other examples, the first control valve 160 can also be installed in other locations within the closed pipe 100, such as in the feed tube 110, depending on actual needs.

[0050] For ease of description, the following example illustrates the connection of the first control valve 160 between two adjacent pipe sections of the slicing tube 120.

[0051] The first control valve 160 can provide at least two passages. In operating mode, one passage connects two adjacent segments of the slicing tube 120, allowing the closed pipeline 100 to transport materials normally, while the passage connecting the closed pipeline 100 and the connecting pipe 220 is disconnected. In cleaning mode, the passage provided by the first control valve 160 connects at least one segment of the slicing tube 120 to the connecting pipe 220, allowing steam supplied by the steam pipe 210 to enter the closed pipeline 100 for hydrolysis via the first control valve 160. The two adjacent segments of the slicing tube 120 can be either connected or disconnected, depending on the segments requiring cleaning. Furthermore, the specific segments of the closed pipeline 100 to be cleaned can also be controlled by valves within the closed pipeline 100.

[0052] Please refer to Figure 5 For example, the first control valve 160 includes a valve body 161, a valve stem 162, and a discharge pipe 163. The valve body 161 is installed in the slicing tube 120, one end of the valve stem 162 is installed in the valve body 161, and the other end of the valve stem 162 has a handwheel. In cleaning mode, one end of the discharge pipe 163 can communicate with the valve body 161, and the other end of the discharge pipe 163 is detachably connected to the connecting pipe 220, so that the steam provided by the steam pipe 210 can enter the closed pipe 100 through the first control valve 160. In operating mode, the end of the discharge pipe 163 away from the valve body 161 can be detachably connected to a blind flange, which is used to seal the discharge pipe 163 to ensure the sealing effect of the closed pipe.

[0053] The valve body 161 can be connected between two sections of the slicing tube 120, and the two sections can be inserted into the valve body 161. The handwheel can drive the valve stem 162 to move relative to the valve body 161 under external force to control the opening and closing of the passage.

[0054] The end of the discharge pipe 163 facing away from the valve body 161 is provided with a first flange connection; the end of the connecting pipe 220 facing the discharge pipe 163 has a second flange connection. In cleaning mode, the first flange connection is connected to the second flange connection, and the first flange connection and the second flange connection are sealed by a metal gasket. In working mode, the first flange connection is connected to a blind flange and can be sealed by a metal gasket.

[0055] In other words, in cleaning mode, the blind flange can be removed and the second flange connection of the connecting pipe 220 can be connected to the first flange connection at the end of the discharge pipe 163; after cleaning, the connecting pipe 220 can be removed and the blind flange can be connected to the first flange connection, so that in working mode, the end of the discharge pipe 163 is blocked and the online steam hydrolysis mechanism 200 does not occupy on-site space.

[0056] The specific structures of the first flange connection, the second flange connection, and the blind flange can be configured according to actual needs. For example, the first flange connection and the second flange connection can each be disc-shaped, butt-jointed and bolted together, with a metal gasket positioned between them. Alternatively, the second flange can be disc-shaped, the first flange connection can be a flange joint, the connector of which is inserted into the second flange connection, the flange of which is bolted to the second flange connection, and a metal gasket positioned between the flange and the second flange connection.

[0057] With the above settings, the discharge pipe 163 can cooperate with the blind plate or the online steam hydrolysis mechanism 200 according to the change of mode, which can ensure that each mode can be realized smoothly and is simple and easy to operate.

[0058] In cleaning mode, the discharge pipe 163 can be directly or indirectly connected to the valve body 161, allowing steam in the steam pipe 210 to enter the closed pipe 100 for hydrolysis through the discharge pipe 163 and the valve body 161. In some examples, the discharge pipe 163 can be directly connected to the bottom of the valve body 161. In other examples, the discharge pipe 163 can be connected to the valve stem 162, which has a channel through which the discharge pipe 163 can be connected to the valve body 161. The shape of the channel in the valve stem 162 can be customized as needed, as long as it allows the discharge pipe 163 to connect to the valve body 161. For example, the channel in the valve stem 162 can have a steam inlet, a steam outlet, and a connecting section. The steam inlet can be connected to the discharge pipe 163, the steam outlet can connect to the valve body 161, and the connecting section connects the steam inlet and the steam outlet. The specific shape of the connecting section can be customized as needed. In cleaning mode, the handwheel can move the valve stem 162 to open the steam outlet, connecting it to the valve body 161. After cleaning, the handwheel moves the valve stem 162 to close the steam outlet, disconnecting the discharge pipe 163 from the valve body 161.

[0059] Optionally, the first control valve 160 may include a jacketed valve. The jacketed valve can regulate the temperature of flowing materials or steam using its temperature medium. For example, the jacketed valve may provide at least a first passage and a second passage. The first passage connects two adjacent sections of the slicing tube 120, and the second passage connects the discharge pipe 163 to the slicing tube 120. The valve stem 162 controls the opening and closing of the second passage, while the first passage is normally open. When the jacketed valve is closed, the valve stem 162 disconnects the second passage, separating the discharge pipe 163 from the slicing tube 120, allowing material to pass through the first passage. When the jacketed valve is in the open state, the valve stem 162 opens the second passage, allowing steam in the connecting pipe 220 to enter the slicing pipe 120 through the second passage. At this time, the second passage can be connected to at least part of the first passage, allowing steam to enter one section of the slicing pipe 120 or both sections of the slicing pipe 120 through the second passage and the first passage. The specific settings can be configured according to actual needs. For example, if steam needs to enter one section of the slicing pipe 120, the first passage can be disconnected, and the second passage can be partially connected to the first passage.

[0060] It is understood that the specific structure and implementation process of the jacketed valve are not limited to this; this embodiment is merely an example. For instance, the jacketed valve can be a jacketed three-way valve commonly used in pipelines transporting fluid media.

[0061] In other examples, the first control valve 160 can be a directional valve or other type of valve, as long as it can achieve the above functions. Alternatively, the first control valve 160 can be a combination of a jacketed valve and a valve with on / off function; for example, a valve with on / off function is installed at one of the joints of the jacketed valve, and the valve controls the on / off connection between the discharge pipe 163 and the valve body 161.

[0062] In some embodiments, the steam pipe 210 includes: a steam pipe 211, a main valve 212, and a second control valve 213. The steam pipe 211 is used to connect to a steam device and is connected to a connecting pipe 220. The main valve 212 and the second control valve 213 are installed in the steam pipe 211. The main valve 212 is further away from the connecting pipe 220 than the second control valve 213. The main valve 212 is used to control the on / off state of the steam pipe 210, and the second control valve 213 is used to regulate the flow rate of the steam pipe 210. The portion of the steam pipe 211 located between the main valve 212 and the second control valve 213 is connected to a drain pipe 230.

[0063] The second control valve 213 can be controlled manually, electrically, or by start-up. The main valve 212 can be controlled manually, electrically, or by start-up.

[0064] The main valve 212 can be connected between two adjacent pipe sections of the steam pipe 211, and the two adjacent pipe sections of the steam pipe 211 can be inserted into the main valve 212 respectively.

[0065] Optionally, the second control valve 213 can be connected between the steam pipe 211 and the connecting pipe 220. A third flange connection can be provided at the end of the connecting pipe 220 facing the second control valve 213. The third flange connection can be detachably connected to the second control valve 213, allowing selection of the connecting pipe 220 to meet site requirements. The third flange connection and the second control valve 213 can be sealed with a metal gasket. The third flange connection can include a flange joint, the joint of which can be inserted into the second control valve 213; alternatively, the third flange connection can be disc-shaped, with the corresponding connector of the second control valve 213 inserted into it. The end of the steam pipe 211 can also be inserted into the second control valve 213, or the connector of the second control valve 213 can be inserted into the steam pipe 211.

[0066] In other examples, only the main valve 212 can be installed in the steam pipe 210, and the steam flow rate can be adjusted by the valve in the closed pipe 100 or by the steam equipment.

[0067] In some embodiments, the drain pipe 230 includes a drain pipe 231, a drain valve 232, and a steam trap 233. The drain valve 232 and the steam trap 233 are installed in the drain pipe 231, and the steam trap 233 is further away from the steam pipe 210 than the drain valve 232.

[0068] The portion of the steam pipe 211 located between the main valve 212 and the second control valve 213 may be equipped with a connector, which connects to the drain pipe 231. The connector may be a tee fitting.

[0069] When switching from the working mode to the cleaning mode, first open the main valve 212 and open the drain valve 232 to allow the water accumulated in the steam pipe 211 to enter the drain pipe 230. Then, the second control valve 213 can be opened to allow steam to enter the closed pipe 100 through the connecting pipe 220 for hydrolysis.

[0070] In other examples, the drain pipe 231 may only be equipped with a drain valve 232, and the end of the drain pipe 231 away from the steam pipe 211 may be connected to a container capable of collecting the discharged water.

[0071] Using the polyester production apparatus of this embodiment, after the polyester production apparatus is stopped, the operation mode is switched to the cleaning mode. The blind flange is removed from the end of the discharge pipe 163 away from the valve body 161, and the connecting pipe 220 is installed to the end of the discharge pipe 163 away from the valve body 161. Protective measures are taken around the discharge pipe 163, and personnel leave the site to prevent hydrolyzed material from being sprayed out during the cleaning process. The main valve 212 is opened, and the drain valve 232 is opened to drain water. After drainage is completed, the second control valve 213 is slightly opened to check for any external leakage at the connecting pipe 220. If there is no external leakage, the first control valve 160 is operated to connect the connecting pipe 220 to the slicing tube 120 for online hydrolytic cleaning, with the flushing flow rate adjusted accordingly. The size and time are adjusted according to the amount of flue gas at the discharge port, ensuring only a small amount of white smoke at the discharge port. This cleaning method has many advantages. On the one hand, it allows for the control of cleaning any section of the pipeline according to the actual situation on site through the second three-way valve 150. On the other hand, it allows for repeated cleaning, ensuring that dead corners and low points in the pipeline are thoroughly cleaned after multiple cleanings. Moreover, the operation is extremely simple and the cost is relatively low. After cleaning, the first control valve 160 is operated to disconnect the connecting pipe 220 from the slicing pipe 120, and the main valve 212 and the flow control valve are closed. The connecting pipe 220 can also be disassembled, and the blind flange can be installed on the first flange connection. At this time, the polyester production unit can be switched to the working mode.

[0072] In practice, the temperature of the polyester production unit when it is put into operation is generally 280℃, the temperature of the steam is about 170℃, the steam pressure can be set to 0.5MPa in cleaning mode, the number of cleaning cycles can be set to more than 3, and the cleaning time for each cycle is 4 to 6 hours.

[0073] In this embodiment, after shutdown, by disassembling the blind flange and installing the online steam hydrolysis mechanism 200, online hydrolysis can be performed using the online steam hydrolysis mechanism 200. After repeated cleaning of the sealed pipeline 100, all residues inside the sealed pipeline 100 can be completely cleaned, achieving a good cleaning effect. This helps ensure that there are no residues when the polyester production unit is put into operation in the future. Moreover, this embodiment is simple to operate, will not corrode the equipment, and is energy-saving and environmentally friendly.

[0074] Other configurations of the polyester production apparatus in the above embodiments can be adopted from various technical solutions now and in the future known to those skilled in the art, and will not be described in detail here.

[0075] In the description of this specification, it should be understood that the terms "clockwise," "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure 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 of this disclosure.

[0076] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this disclosure, "multiple" means two or more, unless otherwise explicitly specified.

[0077] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0078] The foregoing disclosure provides many different implementations or examples for carrying out different structures of this disclosure. To simplify the disclosure, specific examples of components and arrangements have been described above. Of course, these are merely examples and are not intended to limit the scope of this disclosure. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0079] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this disclosure, and these should all be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A polyester production apparatus, characterized in that, include: A closed conduit, comprising an inlet pipe, a slicing pipe, and an outlet pipe; Steam pipe, drain pipe and connecting pipe, wherein the connecting pipe is connected to the steam pipe and the drain pipe is connected to the steam pipe; In cleaning mode, the drainage pipe is used to drain the water accumulated in the steam pipe; the connecting pipe is connected to the sealed pipe to transport the steam in the steam pipe to the sealed pipe.

2. The polyester production apparatus according to claim 1, characterized in that, The sealed pipeline also includes a first control valve, which is installed in the slicing tube. The first control valve is also used to connect to the connecting pipe in the cleaning mode, so that the steam provided by the steam pipeline can enter the sealed pipeline through the first control valve.

3. The polyester production apparatus according to claim 2, characterized in that, The first control valve includes: a valve body, a valve stem, and a discharge pipe; the valve body is installed in the slicing pipe, one end of the valve stem is installed in the valve body, and the other end of the valve stem has a handwheel; In cleaning mode, one end of the discharge pipe can be connected to the valve body, and the other end of the discharge pipe can be detachably connected to the connecting pipe, so that the steam provided by the steam pipe can enter the closed pipe through the first control valve. In the working mode, the end of the discharge pipe away from the valve body is detachably connected to a blind plate, which is used to block the discharge pipe.

4. The polyester production apparatus according to claim 3, characterized in that, The end of the discharge pipe away from the valve body has a first flange connection; the end of the connecting pipe facing the discharge pipe has a second flange connection. In cleaning mode, the first flange connection is connected to the second flange connection, and the first flange connection and the second flange connection are sealed by a metal gasket. In the operating mode, the first flange connection is sealed to the blind plate.

5. The polyester production apparatus according to any one of claims 2 to 4, characterized in that, The first control valve includes a jacketed valve.

6. The polyester production apparatus according to claim 1, characterized in that, The steam pipeline includes: a steam pipe, a main valve, and a second control valve. The steam pipe is used for connecting steam equipment and is connected to the connecting pipe. The main valve and the second control valve are installed in the steam pipe. The main valve is further away from the connecting pipe than the second control valve. The main valve is used to control the on / off state of the steam pipeline, and the second control valve is used to regulate the flow rate of the steam pipeline. The portion of the steam pipe located between the main valve and the second control valve is connected to the drain pipe.

7. The polyester production apparatus according to claim 1, characterized in that, The drainage pipe includes a drainage pipe, a drainage valve, and a steam trap. The drainage valve and the steam trap are installed in the drainage pipe, and the steam trap is further away from the steam pipe than the drainage valve.

8. The polyester production apparatus according to claim 1, characterized in that, The connecting pipe includes a flexible metal tube or a rigid stainless steel tube.

9. The polyester production apparatus according to claim 1, characterized in that, The sealed pipeline also has a first three-way valve and a second three-way valve. The first three-way valve is connected between the feed pipe and the slicing pipe, and the second three-way valve is connected between the slicing pipe and the discharge pipe. The second three-way valve is connected to the two discharge pipes respectively.

10. The polyester production apparatus according to claim 9, characterized in that, The sealed pipeline also includes a spinning tube, which is connected to the first three-way valve.

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