An energy-saving pre-polycondensation tower

Abstract

The present application discloses an energy-saving pre-polycondensation tower, which relates to the technical field of chemical equipment and includes a cylinder body, a tray and a gas collecting pipe arranged in the cylinder body. A heating medium for heating materials flows in the cylinder wall of the cylinder body; the cylinder body includes a connected upper cylinder body and a lower cylinder body, and a pre-polycondensation chamber is formed between the upper cylinder body and the lower cylinder body; a pre-heating chamber for pre-heating the materials is arranged in the upper cylinder body, and a coil heating device is arranged in the pre-heating chamber; multiple layers of trays are provided, and each tray includes an upper tray and a lower tray arranged oppositely; a blanking pipe penetrating through the upper and lower surfaces of the upper tray is arranged at the center of the upper tray; a second blanking channel is formed between the gas collecting pipe and the blanking pipe; the gas collecting pipe is connected to the heat medium input port of the coil heating device; when the material flows through the second blanking channel and contacts the outer wall of the gas collecting pipe, the gas collecting pipe can use the hot gas flowing in the gas collecting pipe to heat the material. The present application has the effects of reducing heat loss of the tower body, improving heating efficiency and reducing energy consumption.

Description

Technical Field

[0001] This application relates to the technical field of chemical equipment, and particularly to an energy-saving pre-polycondensation tower. Background Art

[0002] Pre-polycondensation is an important process in polyester synthesis. It is a transitional process from the esterification stage to the final polycondensation and is the intermediate link in the whole process. Its main task is to carry out pre-condensation reaction on the reacted esterified products flowing through the esterification reactor to meet the technical index requirements, so as to ensure that the final polycondensation reactor produces qualified products.

[0003] In the related art, for example, a Chinese patent with the publication number CN116351327A discloses a vertical integrated reaction device and method for continuous synthesis of polyamide. The device includes a concentration rectification tower and a vertical polycondensation reaction tower. The vertical polycondensation reaction tower includes, from top to bottom, a central circulation reactor, a first multi-stage tray reactor, and a second multi-stage tray reactor connected in sequence. The polyamide salt solution is concentrated in the concentration rectification tower and then enters the central circulation reactor for polycondensation. The produced polyamide product is discharged from the conical bottom of the central circulation reactor and enters the first multi-stage tray reactor for continuous polycondensation reaction. The polyamide product is obtained at the bottom of the second multi-stage tray reactor.

[0004] Aiming at the above-mentioned related art, there are defects of large heat loss of the tower body when heating the material, resulting in low heating efficiency and high energy consumption. Summary of the Invention

[0005] In order to reduce the heat loss of the tower body, improve the heating efficiency and reduce the energy consumption, this application provides an energy-saving pre-polycondensation tower.

[0006] The energy-saving pre-polycondensation tower provided by this application adopts the following technical solutions:

[0007] An energy-saving pre-polycondensation tower, comprising:

[0008] A cylinder body, in which a heating medium for heating the material flows through the cylinder wall of the cylinder body. The cylinder body includes an upper cylinder body and a lower cylinder body. The upper cylinder body and the lower cylinder body are connected and a pre-polycondensation chamber is formed between the upper cylinder body and the lower cylinder body. A pre-heating chamber for pre-heating the material is provided in the upper cylinder body. The communication and the flow rate between the pre-heating chamber and the pre-polycondensation chamber are controlled by a control valve. A coil heating device is provided in the pre-heating chamber.

[0009] The trays are arranged inside the lower cylinder body, and multiple layers of trays are arranged at preset intervals along the height direction; the trays include upper trays and lower trays. The outer edge of the upper tray is hermetically connected to the inner wall of the lower cylinder body. The lower tray is arranged opposite to the upper tray, and a first material dropping channel is formed between the lower tray and the inner wall of the lower cylinder body; a material dropping pipe is provided at the center of the upper tray, which penetrates through the upper and lower surfaces of the upper tray and communicates with the lower tray. The material dropping pipe and the first material dropping channel allow the material on the upper tray to flow from the material dropping pipe to the lower tray and then flow from the first material dropping channel to the upper tray of the next layer;

[0010] The gas collecting pipe is arranged inside the lower cylinder body. The gas collecting pipe penetrates through multiple layers of lower trays and through the material dropping pipes of multiple layers of upper trays. A second material dropping channel for the material to flow through is formed between the gas collecting pipe and the material dropping pipe; one end of the gas collecting pipe extends to the bottom surface of the lowermost tray, and the other end is connected to the heat medium input port of the coil heating device; a number of ventilation holes are formed on the gas collecting pipe to communicate the pre-condensation chamber with the inner cavity of the gas collecting pipe for discharging the hot gas in the pre-condensation chamber; when the material flows through the second material dropping channel and contacts the outer wall of the gas collecting pipe, the gas collecting pipe can use the hot gas flowing inside the gas collecting pipe to heat the material.

[0011] By adopting the above technical solutions, the energy-saving pre-condensation tower can effectively improve the heating efficiency and heat utilization rate of the material; specifically, the design of the gas collecting pipe can not only effectively discharge the hot gas generated by heating the material in the pre-condensation chamber through the gas collecting pipe, but also further perform secondary heating on the material flowing through the second material dropping channel, improving the energy utilization rate and reducing the energy consumption; by arranging a pre-heating chamber inside the upper cylinder body and equipping it with a coil heating device, connecting the gas collecting pipe with the input port of the coil heating device, and using the hot gas in the gas collecting pipe to pre-heat the material, the material can obtain sufficient pre-heating before entering the pre-condensation chamber, thereby shortening the time of the entire process; precisely controlling the flow rate of the material entering the pre-condensation chamber through the control valve; at the same time, the design of multiple layers of trays enables the material to be evenly dispersed and gradually drop between each layer, enabling the material to fully react in the pre-condensation chamber.

[0012] Optionally, the upper cylinder body includes a first inner cylinder body and a first jacket. The first jacket is sleeved outside the first inner cylinder body to form a first heating chamber between the inner wall of the first jacket and the outer wall of the first inner cylinder body. The first inner cylinder body is provided with a spiral first flow guide plate along its outer wall to divide the first heating chamber into a spiral shape. The two ends of the upper cylinder body located in the first heating chamber are respectively provided with a first heating medium input port and a first heating medium output port communicating with the first heating chamber.

[0013] By adopting the above technical solution, the design of the upper cylinder of the prepolymerization tower enables the heating medium to flow along the spiral first guide plate, thereby increasing the heat exchange area and heat exchange time between the heating medium and the first inner cylinder, and improving the heat transfer efficiency; this structure not only ensures that the material is evenly heated in the preheating chamber, but also effectively reduces energy consumption and improves the energy efficiency ratio of the system; at the same time, the heating medium inlet and outlet provided at both ends of the first heating chamber ensure the continuous circulation of the heating medium, further enhancing the stability and reliability of the heating effect.

[0014] Optionally, the lower cylinder includes a second inner cylinder and a second jacket. The second jacket is sleeved outside the second inner cylinder to form a second heating chamber between the inner wall of the second jacket and the outer wall of the second inner cylinder. The second inner cylinder is provided with a spiral second guide plate along its outer wall to divide the second heating chamber into a spiral shape. The lower cylinder is respectively provided with a second heating medium inlet and a second heating medium outlet communicating with the second heating chamber at both ends of the second heating chamber.

[0015] By adopting the above technical solution, the design of the lower cylinder of the prepolymerization tower enables the heating medium to flow along the spiral second guide plate, thereby increasing the heat exchange area and heat exchange time between the heating medium and the second inner cylinder, and improving the heat transfer efficiency; this structure not only ensures that the material is evenly heated in the preheating chamber, but also effectively reduces energy consumption and improves the energy efficiency ratio of the system; at the same time, the heating medium inlet and outlet provided at both ends of the first heating chamber ensure the continuous circulation of the heating medium, further enhancing the stability and reliability of the heating effect.

[0016] Optionally, the end of the first guide plate facing away from the first inner cylinder is infinitely close to the inner wall of the first jacket but does not contact the inner wall of the first jacket; the end of the second guide plate facing away from the second inner cylinder is infinitely close to the inner wall of the second jacket but does not contact the inner wall of the second jacket.

[0017] By adopting the above technical solution, it is possible to effectively reduce the heat loss between the first guide plate and the first jacket and between the second guide plate and the second jacket, ensure that the heat transfer of the heating medium is more uniform and efficient during the flow process, and thus improve the working efficiency and energy utilization rate of the entire prepolymerization tower.

[0018] Optionally, a first feed pipe and a first discharge pipe communicating with the preheating chamber are provided on the cylinder wall of the upper cylinder, a second feed pipe and a second discharge pipe communicating with the prepolymerization chamber are provided on the cylinder wall of the lower cylinder, and one end of the control valve is connected to the first discharge pipe and the other end is connected to the second feed pipe.

[0019] By adopting the above technical scheme, the material flow control between the preheating chamber and the precondensation chamber can be achieved, ensuring that the material has been fully preheated before entering the precondensation chamber, thereby improving the efficiency and energy utilization of the precondensation process; at the same time, through the setting of the control valve, the flow rate and residence time of the material can be flexibly adjusted, thereby optimizing the reaction conditions and improving the quality and output of the product.

[0020] Optionally, the first discharge pipe includes a first inner tube and a first outer tube, one end of the first inner tube is connected to the first inner cylinder and connected to the preheating chamber, and the other end extends to the outside of the first jacket; the first outer tube is sleeved on the outside of the first inner tube, and one end of the first outer tube is fixed on the first jacket, and the other end is sealed and connected to the end of the first inner tube away from the first inner cylinder to form a first insulation chamber connected to the first heating chamber between the first inner tube and the first outer tube.

[0021] By adopting the above technical solution, the design of the first discharge pipe can effectively reduce heat loss; specifically, the first insulation chamber between the first inner tube and the first outer tube is connected to the first heating chamber, ensuring that the material in the preheating chamber can still maintain a high temperature during the transportation process, thereby improving the energy utilization efficiency of the entire system, thereby achieving energy saving effects; at the same time, this design also ensures the continuity and stability of the material, avoiding process problems caused by temperature fluctuations.

[0022] Optionally, the second feed pipe includes a second inner tube and a second outer tube, one end of the second inner tube is connected to the second inner cylinder and connected to the pre-condensation chamber, and the other end extends to the outside of the second jacket; the second outer tube is sleeved on the outside of the second inner tube, and one end of the second outer tube is fixed on the second jacket, and the other end is sealed and connected to one end of the second inner tube away from the second inner cylinder to form a second insulation chamber connected to the second heating chamber between the second inner tube and the second outer tube.

[0023] By adopting the above technical solution, the design of the second discharge pipe can effectively reduce heat loss; specifically, the second insulation chamber between the second inner tube and the second outer tube is connected to the second heating chamber, ensuring that the material transported from the preheating chamber can still maintain a high temperature during the transportation process, thereby improving the energy utilization efficiency of the entire system, thereby achieving energy saving effects; at the same time, this design also ensures the continuity and stability of the material, avoiding process problems caused by temperature fluctuations.

[0024] Optionally, the blanking pipe is provided with a spiral third guide plate along its inner wall to divide the second blanking channel into a spiral shape.

[0025] By adopting the above technical solution, the material in the blanking pipe flows downward along the spiral path under the action of the spiral third guide plate, which increases the residence time and heat exchange area of ​​the material in the second blanking channel and improves the heating efficiency and uniformity of the material.

[0026] Optionally, the vent holes are all located on the side of the lower tray facing away from the upper tray of the same layer and are higher than the upper end of the material discharge pipe of the lower layer tray.

[0027] By adopting the above technical solution, the position design of the vent holes can ensure that the gas generated during the pre-polycondensation process in the pre-polycondensation chamber is smoothly discharged into the gas collecting pipe, and at the same time, can prevent the material from blocking the vent holes to the greatest extent.

[0028] Optionally, a plurality of bubble caps are provided on the surface of the upper tray and the lower tray for receiving the material.

[0029] By adopting the above technical solution, the contact area between the material and the heating medium can be effectively increased, the heat transfer efficiency can be improved, thereby accelerating the preheating process of the material and enhancing the working efficiency of the pre-polycondensation tower.

[0030] In summary, the present application includes at least one of the following beneficial technical effects:

[0031] 1. The energy-saving pre-polycondensation tower can effectively improve the heating efficiency and heat utilization rate of the material; specifically, the design of the gas collecting pipe can not only effectively discharge the hot gas generated by heating the material in the pre-polycondensation chamber through the gas collecting pipe, but also further perform secondary heating on the material flowing through the second material discharge channel, improving the energy utilization rate and reducing the energy consumption; by arranging a preheating chamber in the upper cylinder body and equipping it with a coil heating device, connecting the gas collecting pipe with the input port of the coil heating device, and using the hot gas in the gas collecting pipe to preheat the material, so that the material can obtain sufficient preheating before entering the pre-polycondensation chamber, thereby shortening the time of the entire process; precisely controlling the flow rate of the material entering the pre-polycondensation chamber through the control valve; at the same time, the design of the multi-layer trays enables the material to be evenly dispersed and gradually fall between each level, so that the material can fully react in the pre-polycondensation chamber;

[0032] 2. By adopting the above technical solution, the design of the upper cylinder body of the pre-polycondensation tower enables the heating medium to flow along the spiral first guide plate, thereby increasing the heat exchange area and heat exchange time between the heating medium and the first inner cylinder body, and improving the heat transfer efficiency; this structure not only ensures that the material is evenly heated in the preheating chamber, but also effectively reduces the energy consumption and improves the energy efficiency ratio of the system; at the same time, the heating medium input port and output port provided at both ends of the first heating chamber ensure the continuous circulation of the heating medium, further enhancing the stability and reliability of the heating effect;

[0033] 3. The design of the first discharge pipe can effectively reduce heat loss; specifically, the first insulation cavity between the first inner pipe and the first outer pipe is connected to the first heating cavity, ensuring that the materials in the preheating chamber can still maintain a relatively high temperature during the transportation process, improving the energy utilization efficiency of the entire system, and thus achieving an energy-saving effect; at the same time, this design also ensures the continuity and stability of the materials, avoiding process problems caused by temperature fluctuations. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is the overall structural schematic diagram of Embodiment 1 of the present application.

[0035] Figure 2 is Figure 1 the partial enlarged view of part A in

[0036] Figure 3 is the overall structural schematic diagram of Embodiment 2 of the present application.

[0037] Description of the reference numerals: 1, cylinder body; 11, upper cylinder body; 111, first inner cylinder body; 112, first jacket; 113, first heating cavity; 1131, first heating medium inlet; 1132, first heating medium outlet; 114, first guide plate; 115, first feed pipe; 116, first discharge pipe; 1161, first inner pipe; 1162, first outer pipe; 1163, first insulation cavity; 117, inspection opening; 118, exhaust port; 12, lower cylinder body; 121, second inner cylinder body; 122, second jacket; 123, second heating cavity; 1231, second heating medium inlet; 1232, second heating medium outlet; 124, second guide plate; 125, second feed pipe; 1251, second inner pipe; 1252, second outer pipe; 1253, second insulation cavity; 126, second discharge pipe; 13, pre-polycondensation chamber; 14, preheating chamber; 2, control valve; 3, coil heating device; 4, tray; 41, upper tray; 42, lower tray; 43, first falling channel; 44, downcomer; 5, gas collecting pipe; 51, second falling channel; 52, vent hole; 6, third guide plate; 7, reinforcing ring; 8, temperature detector; 9, pressure detector; 10, skirt support. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The following is a further detailed description of the present application in conjunction with the attached Figures 1-3 drawings.

[0039] Embodiment 1 of the present application discloses an energy-saving pre-polycondensation tower. Embodiment 1

[0040] Refer to Figure 1 and Figure 2, in this embodiment, the energy-saving pre-polycondensation tower includes a cylinder body 1, a tray 4 and a gas collecting pipe 5. The cylinder body 1 is vertically arranged in a cylindrical shape, and a skirt support 10 for supporting the cylinder body 1 is connected to the bottom of the cylinder body 1. The cylinder body 1 includes an upper cylinder body 11 and a lower cylinder body 12. The upper cylinder body 11 and the lower cylinder body 12 are hermetically connected by a flange, and a pre-polycondensation chamber 13 for material heating reaction is formed between the upper cylinder body 11 and the lower cylinder body 12; a separate preheating chamber 14 for preheating the material is formed in the upper cylinder body 11 by partitioning the pre-polycondensation chamber 13, and a coil heating device 3 is arranged in the preheating chamber 14; an exhaust port 118 and a maintenance port 117 communicating with the preheating chamber 14 are respectively opened at the top end and the side wall of the upper cylinder body 11. The exhaust port 118 is used for discharging the waste gas generated when the material is heated in the preheating chamber 14, and the maintenance port 117 can allow personnel to enter the preheating chamber 14 for maintenance or repair work.

[0041] The upper cylinder body 11 includes a first inner cylinder body 111 and a first jacket 112. The first jacket 112 is sleeved outside the first inner cylinder body 111; the first jacket 112 and the first inner cylinder body 111 are hermetically connected through one end of the exhaust port 118 and one end of the flange, so as to form a first heating chamber 113 between the inner wall of the first jacket 112 and the outer wall of the first inner cylinder body 111; a spiral first guide plate 114 is arranged along the outer wall of the first inner cylinder body 111, and the first guide plate 114 divides the first heating chamber 113 into a spiral shape; at the upper and lower ends of the upper cylinder body 11 located in the first heating chamber 113, a first heating medium inlet 1131 and a first heating medium outlet 1132 communicating with the first heating chamber 113 are respectively provided.

[0042] In this embodiment, after the heating medium flows into the first heating chamber 113 from the first heating medium inlet 1131, it spirally flows and exchanges heat around the outer wall of the first inner cylinder body 111 in the first heating chamber 113, improves the temperature of the preheating chamber 14 so as to preheat the material, and finally the heated medium after heat exchange flows out from the first heating medium outlet 1132. In other embodiments, the upper cylinder body 11 and the lower cylinder body 12 can be independent of each other. The preheating chamber 14 is arranged in the upper cylinder body 11, and the pre-polycondensation chamber 13 is arranged in the lower cylinder body 12; the first guide plate 114 can also be arranged on the inner wall of the first jacket 112; a plurality of first heating medium inlets 1131 and first heating medium outlets 1132 can be provided according to the material heating requirements, and the positions of the first heating medium inlets 1131 and the first heating medium outlets 1132 can also be flexibly adjusted according to the situation where the first heating chamber 113 is intercepted by other openings or pipelines.

[0043] Preferably, one end of the first deflector 114 that infinitely deviates from the first inner cylinder 111 is infinitely close to the inner wall of the first jacket 112 but does not contact the inner wall of the first jacket 112. This design can prevent the first deflector 114 from directly contacting the first jacket 112, which would cause the heat of the first inner cylinder 111 to be quickly transferred to the first jacket 112.

[0044] Referring Figure 1 and Figure 2 , in this embodiment, a first feed pipe 115 and a first discharge pipe 116 communicating with the preheating chamber 14 are provided on the cylinder wall of the upper cylinder 11. The height of the first feed pipe 115 is higher than that of the first discharge pipe 116, and the first discharge pipe 116 is located at the bottom end of the preheating chamber 14; the first discharge pipe 116 includes a first inner pipe 1161 and a first outer pipe 1162. One end of the first inner pipe 1161 is connected to the first inner cylinder 111 and communicates with the preheating chamber 14, and the other end extends to the outside of the first jacket 112; the first outer pipe 1162 is sleeved outside the first inner pipe 1161. One end of the first outer pipe 1162 is fixed on the first jacket 112, and the other end is hermetically connected to the end of the first inner pipe 1161 that deviates from the first inner cylinder 111 to form a first heat preservation chamber 1163 communicating with the first heating chamber 113 between the first inner pipe 1161 and the first outer pipe 1162.

[0045] Specifically, the material enters the preheating chamber 14 from the first feed pipe 115, is preheated, and then flows out of the first inner pipe 1161 to the pre-polycondensation chamber 13. A heating medium flows through the first heat preservation chamber 1163 to keep the first inner pipe 1161 warm. In other embodiments, the first feed pipe 115 can also adopt a sandwich heat preservation structure similar to that of the first discharge pipe 116; the number of the first feed pipe 115 and the first discharge pipe 116 can be adjusted as needed; the first heat preservation chamber 1163 can also be independently set to a vacuum state and not communicate with the first heating chamber 113.

[0046] Referring Figure 1 and Figure 2 , in this embodiment, the lower cylinder 12 includes a second inner cylinder 121 and a second jacket 122; the second jacket 122 is sleeved outside the second inner cylinder 121. One end of the second jacket 122 close to the flange is hermetically connected to one end of the second inner cylinder 121 close to the flange to form a second heating chamber 123 between the inner wall of the second jacket 122 and the outer wall of the second inner cylinder 121; a spiral second deflector 124 is provided on the outer wall of the second inner cylinder 121 along its own outer wall, and the second deflector 124 divides the second heating chamber 123 into a spiral shape; a second heating medium input port 1231 and a second heating medium output port 1232 communicating with the second heating chamber 123 are respectively provided at the upper and lower ends of the lower cylinder 12 where the second heating chamber 123 is located.

[0047] In this embodiment, after the heating medium flows into the second heating chamber 123 from the second heating medium inlet 1231, it spirally flows and exchanges heat around the outer wall of the second inner cylinder 121 in the second heating chamber 123 to increase the temperature of the prepolymerization chamber 13 for the prepolymerization reaction of the material. Finally, the heated medium after heat exchange flows out from the second heating medium outlet 1232. In other embodiments, the second deflector 124 can also be arranged on the inner wall of the second jacket 122; a plurality of second heating medium inlets 1231 and second heating medium outlets 1232 can be provided according to the heating requirements of the material, and the positions of the second heating medium inlets 1231 and second heating medium outlets 1232 can also be flexibly adjusted according to the situation where the second heating chamber 123 is intercepted by other openings or pipelines; the first heating medium outlet 1132 can also be directly communicated with the second heating medium inlet 1231.

[0048] Referring to Figure 1 and Figure 2 , in this embodiment, the end of the second deflector 124 that infinitely deviates from the second inner cylinder 121 is infinitely close to the inner wall of the second jacket 122 but does not contact the inner wall of the second jacket 122. Such a design can prevent the second deflector 124 from directly contacting the second jacket 122, which would cause the heat of the second inner cylinder 121 to be quickly transferred to the second jacket 122.

[0049] Preferably, a reinforcing ring 7 for strengthening the connection strength between the second jacket 122 and the second inner cylinder 121 is further provided between the second jacket 122 and the second inner cylinder 121. One end of the reinforcing ring 7 is connected to the outer wall of the second inner cylinder 121, and the other end is connected to the inner wall of the second jacket 122 and passes through the outer wall of the second jacket 122. The reinforcing ring 7 and the second deflector 124 are arranged in parallel to prevent the second heating chamber 123 from being truncated.

[0050] Referring to Figure 1 and Figure 2 , in this embodiment, a second feed pipe 125 and a second discharge pipe 126 communicating with the prepolymerization chamber 13 are provided on the barrel wall of the lower barrel 12. The height of the second feed pipe 125 is higher than that of the second discharge pipe 126. The second feed pipe 125 is communicated with the first discharge pipe 116, and the second discharge pipe 126 is located at the bottom of the prepolymerization chamber 13.

[0051] The second discharge pipe 126 includes a second inner tube 1251 and a second outer tube 1252, one end of the second inner tube 1251 is connected to the second inner cylinder 121 and connected to the pre-condensation chamber 13, and the other end extends to the outside of the second jacket 122 and is connected to the first inner tube 1161; the second outer tube 1252 is sleeved on the outside of the second inner tube 1251, one end of the second outer tube 1252 is fixed on the second jacket 122, and the other end is sealed and connected to the end of the second inner tube 1251 away from the second inner cylinder 121 to form a second insulation chamber 1253 connecting to the second heating chamber 123 between the second inner tube 1251 and the second outer tube 1252; specifically, the material flows from the first inner tube 1161 to the second inner tube 1251 and then enters the pre-heating chamber 14 for pre-condensation reaction, and a heating medium circulates in the second insulation chamber 1253 to insulate the second inner tube 1251. In other embodiments, the second discharge pipe 126 may also adopt a sandwich insulation structure similar to the second feed pipe 125; the number of second feed pipes 125 and second discharge pipes 126 may be adjusted as needed; the second insulation chamber 1253 may also be independently set to a vacuum state and not connected to the second heating chamber 123.

[0052] Preferably, a control valve 2 is provided between the second feed pipe 125 and the first discharge pipe 116 , and the flow rate of the material input into the pre-condensation chamber 13 can be controlled by adjusting the opening size of the control valve 2 .

[0053] Reference Figure 1 and Figure 2 In this embodiment, the tower tray 4 is arranged in the lower cylinder 12, and multiple layers of the tower tray 4 are arranged along the height direction at a preset interval. The interval between adjacent tower trays 4 can be set according to actual needs; the shape of the tower tray 4 matches the cross-sectional shape of the lower cylinder 12.

[0054] The tower plate 4 includes an upper tower plate 41 and a lower tower plate 42 which are arranged opposite to each other. Both the upper tower plate 41 and the lower tower plate 42 are made of stainless steel. The upper tower plate 41 is arranged horizontally and the outer edge of the upper tower plate 41 is sealed and connected to the inner wall of the lower cylinder 12. A drop pipe 44 is provided in the central part of the upper tower plate 41, which passes through the upper and lower surfaces of the upper tower plate 41 and connects to the lower tower plate 42. The outer wall of the drop pipe 44 is sealed and connected to the upper tower plate 41. The upper end of the drop pipe 44 protrudes from the upper surface of the upper tower plate 41 by a certain height, and the lower end of the drop pipe 44 is higher than the upper surface of the lower tower plate 42. In this way, the upper tower plate 41 forms an annular space for accommodating materials.

[0055] The lower tray 42 is connected to the upper tray 41, and a circle of raised structures are provided at the edge of the lower tray 42, which makes the lower tray 42 also form a ring-shaped space for accommodating materials; a first material drop channel 43 is formed between the lower tray 42 and the inner wall of the lower cylinder 12; the material on the upper tray 41 flows over the upper end of the drop pipe 44 and flows to the lower tray 42 through the drop pipe 44, and then flows to the upper surface of the upper tray 41 of the next layer through the first drop channel 43. In other embodiments, the lower tray 42 can also be connected to the inner wall of the second inner cylinder 121.

[0056] Preferably, multiple second feed pipes 125 are provided along the height direction of the lower cylinder 12, and the multiple second feed pipes 125 are all connected to the first discharge pipe 116, and a control valve 2 is provided between the multiple second feed pipes 125 and the first discharge pipe 116. The multiple second feed pipes 125 can transport materials to tower plates 4 at different heights to meet the control of the reaction time of the material in the pre-condensation chamber 13.

[0057] Reference Figure 1 and Figure 2 In this embodiment, the gas collecting pipe 5 is arranged in the lower cylinder 12, and the gas collecting pipe 5 can be made of a stainless steel pipe. The gas collecting pipe 5 passes through the multi-layer lower tower plate 42 and the drop pipe 44 of the multi-layer upper tower plate 41. A second drop channel 51 for materials to flow through is formed between the gas collecting pipe 5 and the drop pipe 44. One end of the gas collecting pipe 5 extends to the bottom surface of the lowest tower plate 4, and the other end is connected to the heat medium input port of the coil heating device 3; the gas collecting pipe 5 is provided with a plurality of vents 52 connecting the pre-condensation chamber 13 and the inner cavity of the gas collecting pipe 5 for discharging the hot air in the pre-condensation chamber 13. The vents 52 are all located on the side of the lower tower plate 42 away from the upper tower plate 41 of the same layer and higher than the upper end of the drop pipe 44 of the lower tower plate 4; such a design can effectively collect and discharge the steam generated during the pre-condensation process, and at the same time use the waste heat of the steam to further heat the material, thereby improving the energy utilization efficiency.

[0058] Reference Figure 1 and Figure 2 In this embodiment, the upper cylinder 11 and the outer wall of the upper cylinder 11 are also provided with multiple temperature detectors 8 and pressure detectors 9 for detecting the temperature, air pressure and hydraulic pressure in the preheating chamber 14 and / or the precondensation chamber 13; the multiple temperature detectors 8 and pressure detectors 9 are all arranged at different heights. Such a design can detect the material temperature or gas temperature at different positions and stages through multiple temperature detectors 8, and detect the air pressure or hydraulic pressure at different positions through multiple pressure detectors 9, so that the reaction state of the material can be monitored more intuitively and in real time.

[0059] Preferably, a plurality of bubble caps are provided on the surfaces of the upper tray 41 and the lower tray 42 for receiving materials. These bubble caps can enhance the turbulence degree of the materials, promote the mass transfer and heat transfer processes. Specifically, bubble caps made of stainless steel can be selected, or bubble caps made of ceramic can also be used. Additionally, microporous nozzles can be added below the bubble caps to further stir the materials by spraying gas or liquid, thereby improving the reaction efficiency.

[0060] The implementation principle of Example 1 is as follows: Through reasonable design and efficient heat transfer methods, the energy consumption is significantly reduced, and the heat transfer efficiency is improved, having good economic and environmental benefits. Specifically, the material first enters the preheating chamber 14 through the first feed pipe 115 and is heated by the coil heating device 3 in the preheating chamber 14; the heating medium in the first heating chamber 113 is evenly distributed through the spiral first deflector 114, ensuring sufficient heat exchange between the heating medium and the first inner cylinder 111, thereby improving the preheating efficiency; the preheated material enters the pre-polycondensation chamber 13 through the first discharge pipe 116; in order to reduce heat loss during the transmission process, the first discharge pipe 116 adopts a double-layer structure, and the internal heating medium effectively insulates it through the first insulation chamber 1163; at the same time, the setting of the control valve 2 allows precise adjustment of the speed of the material entering the pre-polycondensation chamber 13, ensuring the stable operation of the system; after the material enters the pre-polycondensation chamber 13, it descends step by step through the multi-layer trays 4; the material on each tray 4 first falls into the next tray 4 through the downcomer 44, and then is redistributed through the first downcomer channel 43; this process not only ensures the uniform distribution of the material, but also promotes the mixing and reaction between the materials; during the entire pre-polycondensation process, the gas collecting pipe 5 not only collects the vapor generated during the pre-polycondensation process, but also recycles this part of the vapor through the preheating device 3 to further heat the material, significantly improving the energy utilization rate; in addition, multiple temperature detectors 8 and pressure detectors 9 are distributed at different heights in the preheating chamber 14 and the pre-polycondensation chamber 13, capable of real-time monitoring of the state of the material, ensuring the high efficiency and stability of the production process. Example 2

[0061] Refer to Figure 3 , the difference between this Example 2 and Example 1 is that: the downcomer 44 is provided with a spiral third deflector 6 along its inner wall, and the third deflector 6 divides the second downcomer channel 51 into a spiral shape.

[0062] Preferably, an anti-scaling coating can be coated on the surface of the first deflector 114 to reduce the occurrence of scaling and extend the service life.

[0063] The advantages of this Example 2 and Example 1 are that: the material can flow downward along a spiral path under the action of the third deflector 6, increasing the residence time and heat exchange area of the material in the second downcomer channel 51, and improving the heating efficiency and uniformity of the material.

[0064] The above are all the preferred embodiments of the present application, and do not limit the protection scope of the present application. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An energy-saving precondensation tower, characterized in that: include: A cylinder (1), wherein a heating medium for heating materials flows through the cylinder wall of the cylinder (1); the cylinder (1) comprises an upper cylinder (11) and a lower cylinder (12), wherein the upper cylinder (11) and the lower cylinder (12) are connected and a pre-condensation chamber (13) is formed between the upper cylinder (11) and the lower cylinder (12); a pre-heating chamber (14) for pre-heating materials is provided in the upper cylinder (11), and the on-off and flow rate between the pre-heating chamber (14) and the pre-condensation chamber (13) are controlled by a control valve (2), and a coil heating device (3) is provided in the pre-heating chamber (14); A tower tray (4) is arranged in a lower cylinder (12), and the tower tray (4) is provided with multiple layers along a height direction at a preset interval; the tower tray (4) comprises an upper tower tray (41) and a lower tower tray (42); the outer edge of the upper tower tray (41) is sealedly connected to the inner wall of the lower cylinder (12); the lower tower tray (42) is arranged opposite to the upper tower tray (41), and a first material dropping channel (43) is formed between the lower tower tray (42) and the inner wall of the lower cylinder (12); a material dropping pipe (44) is provided at the center of the upper tower tray (41), which passes through the upper and lower surfaces of the upper tower tray (41) and is connected to the lower tower tray (42); the material dropping pipe (44) and the first material dropping channel (43) allow materials on the upper tower tray (41) to flow from the material dropping pipe (44) to the lower tower tray (42) and then flow from the first material dropping channel (43) to the upper tower tray (41) of the next layer; A gas collecting pipe (5) is arranged in the lower cylinder (12), the gas collecting pipe (5) penetrates the multiple layers of lower tower trays (42) and passes through the drop pipes (44) of the multiple layers of upper tower trays (41), and a second drop channel (51) for materials to flow through is formed between the gas collecting pipe (5) and the drop pipe (44); one end of the gas collecting pipe (5) extends to the bottom surface of the lowest tower tray (4), and the other end is connected to the heat medium input port of the coil heating device (3); the gas collecting pipe (5) is provided with a plurality of vents (52) that communicate with the pre-condensation chamber (13) and the inner cavity of the gas collecting pipe (5) for discharging hot air in the pre-condensation chamber (13); the gas collecting pipe (5) can heat the material by using the hot air flowing in the gas collecting pipe (5) when the material flows through the second drop channel (51) and contacts the outer wall of the gas collecting pipe (5).

2. The energy-saving precondensation tower according to claim 1, characterized in that: The upper cylinder (11) comprises a first inner cylinder (111) and a first jacket (112); the first jacket (112) is sleeved outside the first inner cylinder (111) to form a first heating chamber (113) between the inner wall of the first jacket (112) and the outer wall of the first inner cylinder (111); the first inner cylinder (111) is provided with a spiral first guide plate (114) along its outer wall to divide the first heating chamber (113) into a spiral shape; and the upper cylinder (11) is provided with a first heating medium input port (1131) and a first heating medium output port (1132) communicating with the first heating chamber (113) at two ends of the first heating chamber (113), respectively.

3. An energy-saving precondensation tower according to claim 2, characterized in that: The lower cylinder (12) comprises a second inner cylinder (121) and a second jacket (122); the second jacket (122) is sleeved outside the second inner cylinder (121) to form a second heating chamber (123) between the inner wall of the second jacket (122) and the outer wall of the second inner cylinder (121); the second inner cylinder (121) is provided with a spiral second guide plate (124) along its outer wall to divide the second heating chamber (123) into a spiral shape; and the lower cylinder (12) is provided with a second heating medium input port (1231) and a second heating medium output port (1232) at two ends of the second heating chamber (123) respectively connected to the second heating chamber (123).

4. The energy-saving precondensation tower according to claim 3, characterized in that: One end of the first guide plate (114) facing away from the first inner cylinder (111) is infinitely close to the inner wall of the first jacket (112) but does not contact the inner wall of the first jacket (112); and one end of the second guide plate (124) facing away from the second inner cylinder (121) is infinitely close to the inner wall of the second jacket (122) but does not contact the inner wall of the second jacket (122).

5. The energy-saving precondensation tower according to claim 4, characterized in that: A first feed pipe (115) and a first discharge pipe (116) communicating with the preheating chamber (14) are provided on the wall of the upper cylinder (11); a second feed pipe (125) and a second discharge pipe (126) communicating with the precondensation chamber (13) are provided on the wall of the lower cylinder (12); one end of the control valve (2) is connected to the first discharge pipe (116), and the other end is connected to the second feed pipe (125).

6. The energy-saving precondensation tower according to claim 5, characterized in that: The first discharge pipe (116) comprises a first inner tube (1161) and a first outer tube (1162); one end of the first inner tube (1161) is connected to the first inner cylinder (111) and communicates with the preheating chamber (14), and the other end extends to the outside of the first jacket (112); the first outer tube (1162) is sleeved on the outside of the first inner tube (1161), and one end of the first outer tube (1162) is fixed to the first jacket (112), and the other end is sealed and connected to an end of the first inner tube (1161) away from the first inner cylinder (111) to form a first heat preservation chamber (1163) connected to the first heating chamber (113) between the first inner tube (1161) and the first outer tube (1162).

7. The energy-saving precondensation tower according to claim 5, characterized in that: The second feed pipe (125) comprises a second inner tube (1251) and a second outer tube (1252); one end of the second inner tube (1251) is connected to the second inner cylinder (121) and communicates with the pre-condensation chamber (13), and the other end extends to the outside of the second jacket (122); the second outer tube (1252) is sleeved on the outside of the second inner tube (1251), and one end of the second outer tube (1252) is fixed to the second jacket (122), and the other end is sealed and connected to one end of the second inner tube (1251) away from the second inner cylinder (121) to form a second heat preservation chamber (1253) communicating with the second heating chamber (123) between the second inner tube (1251) and the second outer tube (1252).

8. The energy-saving precondensation tower according to claim 1, characterized in that: The material dropping pipe (44) is provided with a spiral third guide plate (6) along its inner wall to divide the second material dropping channel (51) into a spiral shape.

9. The energy-saving precondensation tower according to claim 1, characterized in that: The vent holes (52) are all located on a side of the lower tray (42) away from the upper tray (41) of the same layer and are higher than the upper end of the material drop pipe (44) of the lower tray (4).

10. The energy-saving precondensation tower according to claim 1, characterized in that: A plurality of bubble caps are provided on a surface of the upper tower plate (41) and the lower tower plate (42) for receiving materials.

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