Condensing device and condensing method for production of polymerization inhibitor

Abstract

The invention discloses a condensing device and a condensing method for producing a polymerization inhibitor. The condensing device comprises a pipe shell (10), a heat exchange pipe (40) and a baffle plate (50), the pipe diameter of the heat exchange pipe (40) is increased in the direction from the material inlet (01) to the material outlet (02), the distance between the baffle plates (50) is decreased along with increasing of the pipe diameter of the heat exchange pipe (40), and the temperatures of media input into the heat exchange pipe (40) through the multiple sets of medium inlets (03) and the multiple sets of medium outlets (04) are consistent. The pipe diameter of the heat exchange pipe (40) is increased in the direction from the material inlet (01) to the material outlet (02), the polymerization inhibitor material is changed into a liquid state from a gaseous state through cooling, the pipe diameter of the heat exchange pipe (40) is correspondingly increased, under the condition that fluid resistance is increased, fluid in the heat exchange pipe (40) can flow normally, and the risk that the heat exchange pipe is blocked is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of polymerization inhibitor production, and specifically relates to a condensation device and a condensation method for polymerization inhibitor production. Background Art

[0002] In the production process of polymerization inhibitors, the synthesis reaction is the key link in the entire production process. In this link, the initiator is used to promote the polymerization of monomers into polymers, and then the polymerization inhibitor is added to inhibit the polymerization of the formed polymers. However, the mixture obtained after the synthesis reaction contains impurities such as catalysts, solvents, additives, and unreacted monomers in addition to the target product polymerization inhibitor.

[0003] In order to obtain pure inhibitor products, separation and purification are required. In the separation and purification process, distillation and other methods are required. During the distillation process, the mixture is heated to a certain temperature, and the gaseous components (including unreacted monomers, solvents and other volatile substances) will rise with the steam and condense into liquid after cooling in the condenser, thereby separating from the solid inhibitor. This step not only helps to remove impurities and improve the purity of the product, but also can recover some valuable substances and realize the rational use of resources. The condensation process generally needs to be carried out in a shell and tube heat exchanger.

[0004] In order to make the shell and tube heat exchanger have a higher heat transfer efficiency, a plurality of small-diameter pipes are distributed inside the shell and tube heat exchanger for the passage of the polymerization inhibitor. When the polymerization inhibitor changes from gas to liquid during condensation, the fluidity of the liquid is relatively poor compared to the gas, resulting in the condensed polymerization inhibitor showing a slow flow rate or even blockage in the pipe, which directly affects the heat exchange efficiency of the heat exchanger, causes the heat exchanger to run unstably, and thus shortens the life of the heat exchanger. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention creatively adopts a condensation device and a condensation method for producing an inhibitor to at least partially solve the problems raised in the above background technology.

[0006] The technical solution adopted is as follows: In a first aspect of an embodiment of the present invention, a condensing device for producing a polymerization inhibitor is proposed, comprising: A tube housing, wherein one or more medium inlets and medium outlets are fixedly mounted on the outer side wall of the tube housing, the medium inlets and medium outlets are distributed on both sides of the tube housing and are both connected to the interior of the tube housing; A plurality of heat exchange tubes are arranged in parallel inside the tube shell; A pipe box is fixedly arranged at the end of the pipe shell, and the two pipe boxes are respectively provided with a material inlet and a material outlet, and the material inlet and the material outlet are respectively connected to the two ends of the heat exchange tube; A plurality of baffles are fixedly arranged inside the tube shell and form a serpentine channel for the medium to pass through between the medium inlet and the medium outlet, and the heat exchange tubes pass through the baffles; The diameter of the heat exchange tube is increased along the direction from the material inlet to the material outlet, the spacing between the baffles decreases as the diameter of the heat exchange tube increases, and the temperature of the medium input into the heat exchange tube by multiple groups of medium inlets is consistent.

[0007] Furthermore, the heat exchange tube includes a first heat exchange tube and a second heat exchange tube arranged along the direction from the material inlet to the material outlet, and the diameter of the second heat exchange tube is larger than the diameter of the first heat exchange tube, and the tube shell includes a first tube shell arranged on the outside of the first heat exchange tube and a second tube shell arranged on the outside of the second heat exchange tube, at least one group of the medium inlet and the medium outlet is provided on the outside of the first tube shell, and at least one group of the medium inlet and the medium outlet is provided on the outside of the second tube shell.

[0008] Furthermore, the baffles include a plurality of first baffles arranged in the first tube shell and a plurality of second baffles arranged in the second tube shell, the plurality of first baffles are evenly distributed in the first tube shell or the spacing between them gradually increases along the direction from the material inlet to the material outlet, the plurality of second baffles are evenly distributed in the second tube shell or the spacing between them gradually increases along the direction from the material inlet to the material outlet, and the spacing between any two adjacent second baffles is smaller than the spacing between any two adjacent first baffles.

[0009] Further, a connecting pipe is provided at the connection between the first heat exchange tube and the second heat exchange tube, and the connecting pipe includes a first connecting section and a second connecting section, the first connecting section has the same diameter as the first heat exchange tube and is connected to the first heat exchange tube, and the second connecting section is configured as a tapered tube, and one end of the second connecting section is connected to the first connecting section, and the other end is connected to the second heat exchange tube; A connecting tube shell is disposed on the outer side of the connecting tube, one end of the connecting tube shell is fixedly connected to the first tube shell, and the other end of the connecting tube shell is fixedly connected to the second tube shell.

[0010] Furthermore, an air flow nozzle is fixedly provided inside the connecting pipe, the input end of the air flow nozzle is connected to an external air pump device, and the output end of the air flow nozzle exhausts air to the inside of the second heat exchange tube, so as to increase the pressure inside the second heat exchange tube along the direction from the material inlet to the material outlet.

[0011] Furthermore, the air flow nozzle comprises: A plurality of support pipes are fixed in the interior of the connecting pipe in a centrally symmetrical manner and can be communicated with the air pump device or the adjacent support pipes; An air pipe, fixedly arranged at a middle position of the plurality of support tubes, and extending toward the inside of the second tube shell along the axial direction of the second tube shell; Among them, a nozzle is fixedly provided at the end of the air pipe, a connecting air channel connected to the air pump device is provided inside the bracket pipe, an injection air channel connected to the connecting air channel is provided inside the air pipe, and a plurality of guide air channels connected to the injection air channel are provided inside the nozzle, and the plurality of guide air channels spirally face the inner wall of the second tube shell.

[0012] Furthermore, a guide vane is fixedly provided at the connection between the support tube and the trachea, and the number of the guide vanes is equal to that of the support tube and is distributed in the shape of spiral blades.

[0013] Furthermore, a pressure sensor is fixedly installed at the end of the nozzle, and the pressure sensor is configured to detect the fluid pressure in the second heat exchange tube, and when the fluid pressure in the second heat exchange tube exceeds a preset value, an electrical signal is sent to the air pumping device, so that the air pumping device pumps compressed gas into the second heat exchange tube through the airflow nozzle.

[0014] Furthermore, the length of the second heat exchange tube is less than or equal to the length of the first heat exchange tube, and the ratio of the diameter of the second heat exchange tube to the diameter of the first heat exchange tube is set between 1.25 and 2.

[0015] A second aspect of an embodiment of the present invention provides a condensation method for producing a polymerization inhibitor, using the above-mentioned condensation device for producing a polymerization inhibitor, comprising the following steps: Medium introduction: introducing the cold medium from the medium inlet into the tube shell, and allowing the cold medium to flow out from the medium outlet after passing through the serpentine channel between the baffles; Material introduction: introducing the gaseous polymerization inhibitor from the material inlet into the heat exchange tube, so that the polymerization inhibitor contacts and exchanges heat with the cold medium in the heat exchange tube, and forms a liquid polymerization inhibitor which is discharged from the material outlet; Pipe cleaning: When the pressure sensor detects that the fluid pressure in the second heat exchange tube exceeds a preset value, an electrical signal is sent to the air pumping device, so that the air pumping device pumps compressed gas into the second heat exchange tube through the air flow nozzle to discharge the liquid inhibitor attached to or remaining in the second heat exchange tube.

[0016] The beneficial effects achieved by the present invention using the above structure are as follows: (1) The diameter of the heat exchange tube is set to increase from the material inlet to the material outlet. As the inhibitor material changes from gas to liquid after cooling, the diameter of the heat exchange tube is also increased accordingly. Even when the fluid resistance increases, the fluid in the heat exchange tube can still flow normally, reducing the risk of blockage of the heat exchange tube.

[0017] (2) The spacing between the baffles decreases as the diameter of the heat exchange tube increases, which can extend the contact time between the cooling medium and the heat exchange tube when the cooling medium moves the same distance in the length direction of the tube shell. When the tube diameter increases, the contact time between the cooling medium and the inhibitor in the heat exchange tube is further increased, thereby improving the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the three-dimensional structure of a condensing device for producing polymerization inhibitors proposed in an embodiment of the present invention; Figure 2 A schematic diagram of the three-dimensional structure of the heat exchange tube and the baffle plate proposed in an embodiment of the present invention; Figure 3 A schematic side view of a condensing device for producing polymerization inhibitors according to an embodiment of the present invention; Figure 4 A schematic diagram of the internal structure of a condensing device for producing polymerization inhibitors proposed in an embodiment of the present invention; Figure 5 A schematic diagram of the installation structure of the airflow nozzle proposed in an embodiment of the present invention; Figure 6 for Figure 5 Schematic diagram of the right side view of the mid-flow nozzle.

[0019] Among them, 01, material inlet; 02, material outlet; 03, medium inlet; 03a, first medium inlet; 03b, second medium inlet; 04, medium outlet; 04a, first medium outlet; 04b, second medium outlet; 05, gas pipe joint; 10, tube shell; 1a, first tube shell; 1b, second tube shell; 11, tube sheet; 11a, first tube sheet; 11b, second tube sheet; 20, connecting tube shell; 21, third tube sheet; 30, tube box; 31, the first A pipe box; 32, a second pipe box; 40, a heat exchange tube; 4a, a first heat exchange tube; 4b, a second heat exchange tube; 50, a baffle; 50a, a first baffle; 50b, a second baffle; 60, a connecting pipe; 60a, a first connecting section; 60b, a second connecting section; 70, an air flow nozzle; 71, a support pipe; 710, a connecting airway; 72, an air pipe; 720, an injection airway; 73, a guide vane; 74, a nozzle; 740, a guide airway; 80, a pressure sensor.

[0020] The accompanying drawings are used to provide further understanding of the embodiments and constitute a part of the specification. They are used for explanation together with the embodiments and do not constitute a limitation of the embodiments. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments; based on the embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection.

[0022] In the description of the embodiments, it should be understood that terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the embodiments.

[0023] Liquid polymerization inhibitors and powder polymerization inhibitors are the two main forms of polymerization inhibitors. Liquid polymerization inhibitors usually exist in the form of solutions or suspensions, which are easy to use and mix, and are suitable for systems that require rapid dispersion or dissolution of polymerization inhibitors; while powder polymerization inhibitors are in the form of solid powders, which are easier to disperse in solid materials, such as polymer particles or fibers, and are also convenient for storage and transportation. The appropriate product form can be selected according to specific needs and process conditions. Whether it is a liquid polymerization inhibitor or a powder polymerization inhibitor, it needs to be separated and purified after the synthesis reaction. This link is one of the important steps to ensure the quality and purity of the product. In the separation and purification process, the distilled gaseous components (including unreacted monomers, solvents and other volatile substances) need to be cooled in the condenser and condensed into a liquid. This step not only helps to remove impurities and improve the purity of the product, but also can recover some valuable substances and realize the rational use of resources.

[0024] like Figure 1 As shown, in a first aspect of an embodiment of the present invention, a condensing device for producing an inhibitor is provided, comprising a tube shell 10 , a heat exchange tube 40 , a tube box 30 and a baffle 50 .

[0025] Among them, one or more medium inlets 03 and medium outlets 04 are fixedly installed on the outer wall of the tube shell 10, and the medium inlet 03 and the medium outlet 04 are distributed on both sides of the tube shell 10 (generally, the medium inlet 03 is located at the bottom, and the medium outlet 04 is located at the top), and are both connected to the inside of the tube shell 10, and multiple heat exchange tubes 40 are fixed inside the tube shell 10 in a direction parallel to the axis of the tube shell 10, wherein the tube shell 10 is set as a hollow tube body, the axis of the tube shell 10 is the axis of the tube body, and the multiple heat exchange tubes 40 are parallel to each other and parallel to the inner wall of the tube shell 10.

[0026] Furthermore, the pipe box 30 is fixedly arranged at the end of the pipe shell 10, and the first pipe box 31 and the second pipe box 32 are respectively provided with a material inlet 01 and a material outlet 02, and the material inlet 01 and the material outlet 02 are respectively connected to the two ends of the heat exchange tube 40, so that the inhibitor material enters the heat exchange tube 40 from the material inlet 01, exchanges heat with the cold medium entering the pipe shell 10 from the medium inlet 03, and cools the gaseous inhibitor to a liquid inhibitor.

[0027] Furthermore, a plurality of baffles 50 are fixedly arranged inside the tube shell 10, and a serpentine channel for medium to pass through is formed between the medium inlet 03 and the medium outlet 04, and the heat exchange tube 40 passes through the baffle 50, thereby increasing the contact time between the cold medium and the inhibitor in the heat exchange tube 40, thereby improving the heat exchange efficiency.

[0028] Among them, the diameter of the heat exchange tube 40 is set to increase from the material inlet 01 to the material outlet 02. In this way, as the inhibitor material is cooled from gas to liquid, the diameter of the heat exchange tube 40 is also increased accordingly. When the fluid resistance increases, the fluid in the heat exchange tube 40 can also flow normally, reducing the risk of blockage of the heat exchange tube 40. The spacing between the baffles 50 decreases as the diameter of the heat exchange tube 40 increases. In this way, the contact time of the cold medium with the heat exchange tube 40 when moving the same distance in the length direction of the tube shell 10 can be extended. When the diameter of the tube increases, the contact time of the cold medium with the inhibitor in the heat exchange tube 40 is further increased, and the temperature of the medium input into the heat exchange tube 40 by multiple groups of medium inlets 03 is consistent. In this way, it can be ensured that the medium input into the heat exchange tube 40 by multiple groups of medium inlets 03 is in a relatively low temperature medium.

[0029] like Figure 2 As shown, in some embodiments, the heat exchange tube 40 includes a first heat exchange tube 4a and a second heat exchange tube 4b arranged along the direction from the material inlet 01 to the material outlet 02, wherein the diameter of the second heat exchange tube 4b is larger than the diameter of the first heat exchange tube 4a, so that when the inhibitor material in the second heat exchange tube 4b becomes liquid, the corresponding tube diameter is also increased, which facilitates the flow of the liquid inhibitor material and reduces the possibility of blockage of the heat exchange tube 40.

[0030] Correspondingly, such as Figure 3 As shown, the tube shell 10 includes a first tube shell 1a arranged on the outside of the first heat exchange tube 4a and a second tube shell 1b arranged on the outside of the second heat exchange tube 4b, and at least one group of first medium inlet 03a and first medium outlet 04a is provided on the outside of the first tube shell 1a, and at least one group of second medium inlet 03b and second medium outlet 04b is provided on the outside of the second tube shell 1b. In this way, at least one group of medium inlet 03 and medium outlet 04 is provided on the outside of each tube shell 10, so that the temperature of the medium entering the tube shell 10 can reach the initial temperature, which can improve the heat exchange efficiency.

[0031] In some embodiments, a tube sheet 11 is disposed inside the tube shell 10. Accordingly, the tube sheet 11 in the first tube shell 1a is a first tube sheet 11a, and the first tube sheet 11a is used to fix the multiple first heat exchange tubes 4a in the first tube shell 1a. The tube sheet 11 in the second tube shell 1b is a second tube sheet 11b, and the second tube sheet 11b is used to fix the multiple second heat exchange tubes 4b in the second tube shell 1b.

[0032] like Figure 2 and Figure 4 As shown, the baffle 50 includes a plurality of first baffles 50a arranged in the first tube shell 1a and a plurality of second baffles 50b arranged in the second tube shell 1b. The plurality of first baffles 50a are equidistantly distributed in the first tube shell 1a or the spacing between them gradually increases along the direction from the material inlet 01 to the material outlet 02. When the first baffles 50a are equidistantly distributed, the flow velocity of the cold medium will be relatively uniform. When the distribution of the first baffles 50a changes from dense to sparse, the flow velocity of the cold medium will change from slow to fast, thereby increasing the heat exchange time between the cold medium and the material at relatively low temperatures and improving the heat exchange efficiency.

[0033] Multiple second baffles 50b are evenly distributed in the second tube shell 1b or the spacing between them gradually increases along the direction from the material inlet 01 to the material outlet 02. When the second baffles 50b are evenly distributed, the flow velocity of the cold medium will be relatively uniform. When the distribution of the second baffles 50b changes from dense to sparse, the flow velocity of the cold medium will change from slow to fast, thereby increasing the heat exchange time between the cold medium and the material at relatively low temperatures and improving the heat exchange efficiency.

[0034] Furthermore, the spacing between any two adjacent second baffles 50b is smaller than the spacing between any two adjacent first baffles 50a, which can make the flow rate of the cold medium in the second tube shell 1b relatively slow. Since the diameter of the second heat exchange tube 4b is relatively thick, the speed of the medium in the second tube shell 1b is slowed down, and the heat exchange time with the inhibitor material in the second heat exchange tube 4b is extended, thereby achieving a better cooling effect.

[0035] like Figure 4 As shown, a connecting pipe 60 is provided at the connection between the first heat exchange tube 4a and the second heat exchange tube 4b.

[0036] In some embodiments, the connecting pipe 60 includes a first connecting section 60a and a second connecting section 60b, wherein the diameter of the first connecting section 60a is the same as the diameter of the first heat exchange tube 4a and is connected to the first heat exchange tube 4a, and the second connecting section 60b is configured as a conical tube, and one end of the second connecting section 60b is connected to the first connecting section 60a, and the other end is connected to the second heat exchange tube 4b. The first heat exchange tube 4a and the second heat exchange tube 4b are connected by the conical connecting pipe 60, so that the inhibitor material in the small diameter can be evenly diffused into the second heat exchange tube 4b with a large diameter.

[0037] Furthermore, a connecting tube shell 20 is provided on the outer side of the connecting tube 60, one end of the connecting tube shell 20 is fixedly connected to the first tube shell 1a, and the other end is fixedly connected to the second tube shell 1b. The tube diameter of the connecting tube shell 20 is the same as that of the first tube shell 1a and the second tube shell 1b, and the connecting tube shell 20 is connected to the first tube shell 1a and the second tube shell 1b by a flange. An air pipe joint 05 is provided on the outer wall of the connecting tube shell 20, and the air pipe joint 05 can be used to connect an external air pump device, and a third tube sheet 21 is provided inside the connecting tube shell 20, and the third tube sheet 21 is used to fix the internal connecting tube 60.

[0038] In some embodiments, the multiple connecting tubes 60 in the connecting tube shell 20 are connected in series and are all connected to the air pipe connector 05. When the air pipe connector 05 is externally connected to an air pump device, the external air flow can be pumped into the multiple connecting tubes 60.

[0039] like Figure 5 As shown, an airflow nozzle 70 is fixedly provided inside the connecting tube 60, and the input end of the airflow nozzle 70 is connected to an external air pump device, and the output end of the airflow nozzle 70 exhausts air to the inside of the second heat exchange tube 4b, so as to increase the pressure in the second heat exchange tube 4b along the direction from the material inlet 01 to the material outlet 02. In this way, when the flow rate of the liquid inhibitor in the second heat exchange tube 4b slows down or adheres to the tube wall, resulting in an increase in the pressure in the tube, the airflow nozzle 70 can be introduced into the second heat exchange tube 4b, thereby promoting the discharge of the inhibitor material in the second heat exchange tube 4b and removing the inhibitor attached to the tube wall of the second heat exchange tube 4b.

[0040] like Figure 5 and Figure 6 As shown, the air flow nozzle 70 includes a support tube 71 and an air pipe 72 .

[0041] Among them, multiple support tubes 71 are fixed inside the connecting tube 60 in a centrally symmetrical manner, and can be connected to the pump air device or adjacent support tubes 71. The air pipe 72 is fixedly arranged at the middle position of the multiple support tubes 71 and extends into the second tube shell 1b along the axial direction of the second tube shell 1b.

[0042] In some embodiments, three support tubes 71 are provided to form a stable triangular support and to fix the air pipe 72 at the middle position.

[0043] Furthermore, a nozzle 74 is fixedly provided at the end of the air pipe 72, a connecting air channel 710 connected to the air pumping device is provided inside the support pipe 71, an injection air channel 720 connected to the connecting air channel 710 is provided inside the air pipe 72, and a plurality of guide air channels 740 connected to the injection air channel 720 are provided inside the nozzle 74, and the plurality of guide air channels 740 are spirally directed toward the inner wall of the second tube shell 1b. In this way, after the external air pumping device pumps air into the connecting air channel 710, the air flow is gathered in the injection air channel 720 and is ejected from the guide air channel 740 in a spiral state to the inner wall of the second tube shell 1b. In this way, during the air flow injection process, not only can the pressure of the fluid in the second tube shell 1b be increased, and the discharge of the inhibitor material in the second tube shell 1b be promoted, but also the inhibitor attached to the inner wall of the second tube shell 1b can be removed.

[0044] Furthermore, in order to make the inhibitor material flowing in the second tube shell 1b fully contact and exchange heat with the external cold medium, a guide plate 73 is fixed at the connection between the support tube 71 and the air pipe 72. The number of guide plates 73 is equal to that of the support tube 71, and they are distributed in the shape of spiral blades. In this way, after passing through the guide plate 73, the inhibitor material will form a spiral fluid in the second heat exchange tube 4b, which is conducive to the forward flow of the fluid. At the same time, it can also make the inhibitor material exchange inside and outside, fully exchange heat with the external cold medium, and achieve the purpose of sufficient heat exchange.

[0045] Furthermore, a pressure sensor 80 is fixedly installed at the end of the nozzle 74. The pressure sensor 80 is configured to detect the fluid pressure in the second heat exchange tube 4b, and when the fluid pressure in the second heat exchange tube 4b exceeds a preset value, an electrical signal is sent to the air pumping device, so that the air pumping device pumps compressed gas into the second heat exchange tube 4b through the air flow nozzle 70. In this way, a feedback signal is sent to the air pumping device through the pressure sensor 80. When the fluid pressure in the second heat exchange tube 4b exceeds the preset value, compressed gas is pumped into the second heat exchange tube 4b through the air pumping device, so that the liquid inhibitor material in the second heat exchange tube 4b is discharged in time, and the attachments are cleaned to avoid further attachment, thereby reducing the risk of pipeline blockage.

[0046] In some embodiments, the length of the second heat exchange tube 4b is less than or equal to the length of the first heat exchange tube 4a, and the diameter ratio of the second heat exchange tube 4b to the first heat exchange tube 4a is set between 1.25 and 2. By setting a second heat exchange tube 4b with a relatively large diameter, the liquid inhibitor material can flow more smoothly in the second heat exchange tube 4b, reducing the risk of material blockage.

[0047] In a second aspect of an embodiment of the present invention, a condensation method for producing a polymerization inhibitor is provided, using the above-mentioned condensation device for producing a polymerization inhibitor, comprising the following steps: Medium introduction: The cold medium is introduced into the tube shell 10 from the medium inlet 03, and the cold medium passes through the serpentine channel between the baffles 50 and then flows out from the medium outlet 04. Generally, the cold medium is 20℃~30℃ water. After the water flows through the serpentine channel between the baffles 50, it exchanges heat with the high-temperature inhibitor material in the heat exchange tube 40 to cool the inhibitor material. When the baffles 50 are equidistantly distributed, the flow velocity of the cold medium will be relatively uniform. When the baffles 50 are distributed from dense to sparse, the flow velocity of the cold medium will change from slow to fast, thereby increasing the heat exchange time between the cold medium and the material at relatively low temperatures and improving the heat exchange efficiency.

[0048] Material introduction: The gaseous polymerization inhibitor is introduced into the heat exchange tube 40 from the material inlet 01, so that the polymerization inhibitor contacts and exchanges heat with the cold medium in the heat exchange tube 40, and forms a liquid polymerization inhibitor which is discharged from the material outlet 02. For example, the heat exchange tube 40 includes a first heat exchange tube 4a and a second heat exchange tube 4b arranged along the direction from the material inlet 01 to the material outlet 02. The diameter of the second heat exchange tube 4b is made larger than the diameter of the first heat exchange tube 4a. When the polymerization inhibitor material in the second heat exchange tube 4b becomes liquid, the corresponding diameter is also increased, which facilitates the flow of the liquid polymerization inhibitor material and reduces the possibility of blockage of the heat exchange tube 40.

[0049] Pipe cleaning: When the pressure sensor 80 detects that the fluid pressure in the second heat exchange tube 4b exceeds the preset value (6.4MPa), an electrical signal is sent to the air pumping device, so that the air pumping device pumps compressed gas into the second heat exchange tube 4b through the airflow nozzle 70 to discharge the liquid inhibitor attached to or remaining in the second heat exchange tube 4b. When the flow rate of the liquid inhibitor inside the second heat exchange tube 4b slows down or adheres to the tube wall, resulting in an increase in the pressure in the tube, the pressure sensor 80 sends a feedback signal to the air pumping device, and an airflow can be introduced into the second heat exchange tube 4b through the airflow nozzle 70, thereby promoting the discharge of the inhibitor material in the second heat exchange tube 4b and clearing the inhibitor attached to the tube wall of the second heat exchange tube 4b.

[0050] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0051] The above description of the implementation mode is not restrictive, and the drawings show only one of the implementation modes, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the scope of protection.

Claims

1. A condensation device for producing polymerization inhibitor, characterized in that: include: A tube housing (10), wherein one or more medium inlets (03) and medium outlets (04) are fixedly mounted on the outer wall of the tube housing (10), and the medium inlets (03) and medium outlets (04) are distributed on both sides of the tube housing (10) and are both connected to the interior of the tube housing (10); A plurality of heat exchange tubes (40) are arranged in parallel with each other inside the tube shell (10); A pipe box (30) is fixedly arranged at the end of the pipe shell (10), and the two pipe boxes (30) are respectively provided with a material inlet (01) and a material outlet (02), and the material inlet (01) and the material outlet (02) are respectively connected to the two ends of the heat exchange pipe (40); A plurality of baffles (50) are fixedly arranged inside the tube shell (10) and form a serpentine channel for the medium to pass through between the medium inlet (03) and the medium outlet (04), and the heat exchange tube (40) passes through the baffles (50); The diameter of the heat exchange tube (40) is increased in the direction from the material inlet (01) to the material outlet (02), the spacing between the baffles (50) decreases as the diameter of the heat exchange tube (40) increases, and the temperature of the medium input into the heat exchange tube (40) by the multiple groups of medium inlets (03) is consistent.

2. The condensation device for producing polymerization inhibitor according to claim 1, characterized in that: The heat exchange tube (40) comprises a first heat exchange tube (4a) and a second heat exchange tube (4b) arranged along the direction from the material inlet (01) to the material outlet (02), and the diameter of the second heat exchange tube (4b) is larger than the diameter of the first heat exchange tube (4a). The tube shell (10) comprises a first tube shell (1a) arranged on the outside of the first heat exchange tube (4a) and a second tube shell (1b) arranged on the outside of the second heat exchange tube (4b). The outside of the first tube shell (1a) is provided with at least one set of the medium inlet (03) and the medium outlet (04), and the outside of the second tube shell (1b) is provided with at least one set of the medium inlet (03) and the medium outlet (04).

3. The condensation device for producing polymerization inhibitor according to claim 2, characterized in that: The baffles (50) include a plurality of first baffles (50a) arranged in the first tube shell (1a) and a plurality of second baffles (50b) arranged in the second tube shell (1b); the plurality of first baffles (50a) are evenly spaced in the first tube shell (1a) or the spacing between them gradually increases along the direction from the material inlet (01) to the material outlet (02); the plurality of second baffles (50b) are evenly spaced in the second tube shell (1b) or the spacing between them gradually increases along the direction from the material inlet (01) to the material outlet (02); and the spacing between any two adjacent second baffles (50b) is smaller than the spacing between any two adjacent first baffles (50a).

4. The condensation device for producing polymerization inhibitor according to claim 2, characterized in that: A connecting pipe (60) is provided at the connection between the first heat exchange tube (4a) and the second heat exchange tube (4b), the connecting pipe (60) comprising a first connecting section (60a) and a second connecting section (60b), the first connecting section (60a) having the same diameter as the first heat exchange tube (4a) and being in communication with the first heat exchange tube (4a), the second connecting section (60b) being configured as a tapered tube, one end of the second connecting section (60b) being in communication with the first connecting section (60a), and the other end being in communication with the second heat exchange tube (4b); A connecting tube shell (20) is provided on the outer side of the connecting tube (60); one end of the connecting tube shell (20) is fixedly connected to the first tube shell (1a), and the other end of the connecting tube shell (20) is fixedly connected to the second tube shell (1b).

5. The condensation device for producing polymerization inhibitor according to claim 4, characterized in that: An airflow nozzle (70) is fixedly provided inside the connecting pipe (60), the input end of the airflow nozzle (70) is connected to an external air pump device, and the output end of the airflow nozzle (70) exhausts air into the second heat exchange tube (4b), so as to increase the pressure in the second heat exchange tube (4b) along the direction from the material inlet (01) to the material outlet (02).

6. The condensation device for producing polymerization inhibitor according to claim 5, characterized in that: The air flow nozzle (70) comprises: A plurality of support tubes (71) are fixed in a centrally symmetrical manner inside the connecting tube (60) and are capable of communicating with the air pump device or adjacent support tubes (71); An air pipe (72) is fixedly arranged at a middle position of the plurality of support tubes (71) and extends toward the interior of the second tube shell (1b) along an axial direction of the second tube shell (1b); The end of the air pipe (72) is fixedly provided with a nozzle (74), the interior of the support tube (71) is provided with a connecting air channel (710) connected to the air pump device, the interior of the air pipe (72) is provided with an injection air channel (720) connected to the connecting air channel (710), and the interior of the nozzle (74) is provided with a plurality of guide air channels (740) connected to the injection air channel (720), and the plurality of guide air channels (740) are spirally disposed toward the inner wall of the second tube shell (1b).

7. The condensation device for producing polymerization inhibitor according to claim 6, characterized in that: A guide vane (73) is fixedly provided at the connection between the support tube (71) and the air pipe (72); the number of the guide vanes (73) is equal to that of the support tube (71), and they are distributed in the shape of spiral blades.

8. The condensation device for producing polymerization inhibitor according to claim 6, characterized in that: A pressure sensor (80) is fixedly mounted on the end of the nozzle (74). The pressure sensor (80) is configured to detect the fluid pressure in the second heat exchange tube (4b), and when the fluid pressure in the second heat exchange tube (4b) exceeds a preset value, an electrical signal is sent to the air pumping device, so that the air pumping device pumps compressed gas into the second heat exchange tube (4b) through the air flow nozzle (70).

9. The condensation device for producing polymerization inhibitor according to claim 1, characterized in that: The length of the second heat exchange tube (4b) is less than or equal to the length of the first heat exchange tube (4a), and the ratio of the diameter of the second heat exchange tube (4b) to the diameter of the first heat exchange tube (4a) is set between 1.25 and 2.

10. A condensation method for producing a polymerization inhibitor, characterized in that: The condensation device for producing polymerization inhibitor according to claim 8 comprises the following steps: Medium introduction: introducing a cold medium from the medium inlet (03) into the tube shell (10), and allowing the cold medium to flow out from the medium outlet (04) after passing through the serpentine channel between the baffles (50); Material introduction: introducing a gaseous polymerization inhibitor from the material inlet (01) into the heat exchange tube (40), so that the polymerization inhibitor contacts and exchanges heat with a cold medium in the heat exchange tube (40), and forms a liquid polymerization inhibitor which is discharged from the material outlet (02); Pipe cleaning: When the pressure sensor (80) detects that the fluid pressure in the second heat exchange tube (4b) exceeds a preset value, an electrical signal is sent to the air pumping device, causing the air pumping device to pump compressed gas into the second heat exchange tube (4b) through the air flow nozzle (70), thereby discharging the liquid inhibitor attached to or remaining in the second heat exchange tube (4b).

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