Energy-saving heat exchange structure for distillation tower

Abstract

The utility model relates to the technical field of distillation equipment, and discloses an energy-saving heat exchange structure for a distillation tower, including a distillation tower and a heat exchanger, wherein a plurality of low-temperature cavities and a plurality of high-temperature cavities are arranged in the heat exchanger, and the low-temperature cavities and the high-temperature cavities are staggered; a first input port, a first output port, a second input port and a second output port are provided on the heat exchanger, the first input port and the first output port are connected with the low-temperature cavity, the first input port is used to transport materials to be distilled into the low-temperature cavity, and the first output port is connected with the feed port of the distillation tower; the second input port and the second output port are connected with the high-temperature cavity, the second input port is connected with the discharge port of the distillation tower, the second input port is used to transport the materials after distillation to the high-temperature cavity, and the second output port is used to output the materials in the high-temperature cavity. The utility model has the beneficial effects of high heat exchange efficiency and low heat exchange cost.

Description

Technical Field

[0001] The utility model relates to the technical field of distillation equipment, in particular to an energy-saving heat exchange structure for a distillation tower. Background Art

[0002] Methyl methacrylate (MMA) is an important organic chemical raw material and a homopolymer or copolymer monomer, which is widely used in household appliances, automobiles, construction, sanitary ware, instruments and meters, advertising and decoration and other industries. When producing MMA, ACH method, C4 method and C2 method are mainly used for production. In the production process of ACH (acetone cyanohydrin) and MMA, it is usually necessary to use a distillation tower for distillation processing, so that the light components (low boiling substances) in the liquid phase are transferred to the gas phase, and the heavy components (high boiling substances) in the gas phase are transferred to the liquid phase, so as to achieve the purpose of separation.

[0003] For example, a patent document with publication number CN112546660A discloses a chemical distillation tower, which relates to the field of chemical production technology; it includes a tower body, a tower plate, an overflow pipe, a reboiler, a condenser, a water pump, a water tank, a condensation plate and a condensing plate; the condensing plate is horizontally fixed to the inside of the tower body, the condensing plate is a cavity structure, and the inside is a liquid cavity. A plurality of groups of evenly distributed condensing channels are provided on the condensing plate, and the condensing channels are cones that are narrow at the top and wide at the bottom, and a plurality of groups of heat-conducting ridges are evenly fixed inside the condensing channels; the condensing plate is horizontally fixed to the inside of the tower body and is located above the condensing plate, and a plurality of groups of liquid collecting cones are fixed below the condensing plate, and the cone tips of the liquid collecting cones correspond to each condensing channel respectively, and a plurality of groups of penetrating steam holes are provided on the condensing plate between each liquid collecting cone.

[0004] The above technical solution can initially filter high-boiling point components in the tower body, reduce the working pressure of the condenser, speed up the circulation speed, and improve the distillation efficiency. When the material enters the distillation tower for processing, it needs to be heated by steam water through a heat exchanger, and the material after distillation in the distillation tower needs to be cooled by a circulating water cooler; however, when heating the material, the steam water can usually only be controlled at around 95°C, resulting in a large amount of steam water being required when the material is heated to the specified position; and a large amount of circulating water is required to reduce the high-temperature material after distillation processing to room temperature, resulting in excessive use of steam water and circulating water during the distillation process, which is not conducive to cost control during product production. Utility Model Content

[0005] The utility model aims to provide an energy-saving heat exchange structure for a distillation tower to solve the technical problem in the prior art that the amount of steam water and circulating water used is too large, which is not conducive to cost control in the product production process.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an energy-saving heat exchange structure for a distillation tower, comprising a distillation tower and a heat exchanger, wherein a plurality of low-temperature cavities and a plurality of high-temperature cavities are arranged in the heat exchanger, and the low-temperature cavities and the high-temperature cavities are staggered; a first input port, a first output port, a second input port and a second output port are opened on the heat exchanger, the first input port and the first output port are connected to the low-temperature cavity, the first input port is used to transport the material to be distilled into the low-temperature cavity, and the first output port is connected to the feed port of the distillation tower; the second input port and the second output port are connected to the high-temperature cavity, the second input port is connected to the discharge port of the distillation tower, the second input port is used to transport the material after distillation to the high-temperature cavity, and the second output port is used to output the material in the high-temperature cavity.

[0007] The principle and advantage of this scheme are: when the material is subjected to distillation processing, the material to be subjected to distillation processing is transported to the heat exchanger through the first input port for heating, and the heated material is transported to the distillation tower through the first output port. The material after the distillation processing is transported to the heat exchanger through the second input port for cooling, and the cooled material is transported to the next process through the second output port. When the heat exchanger heats and cools the material, it exchanges heat between the material before and after distillation, so that the heat in the high-temperature material after distillation is transferred to the low-temperature material before distillation to complete the heating and cooling of the material.

[0008] When heating and cooling the materials for distillation processing, this scheme realizes the reuse of heat applied to the materials during the distillation process by exchanging heat between the low-temperature materials before distillation processing and the high-temperature materials after distillation processing, thereby improving the utilization rate of resources; and the high-temperature materials after distillation processing are used to heat the materials to be distilled. Since the temperature of the materials after distillation processing can reach above 115°C, which is much higher than the 95°C of traditional distilled high-temperature water, the heating efficiency is higher when heating the materials, shortening the heating time of the materials, and reducing the amount of steam water used when heating the materials. In addition, the temperature of the materials after distillation processing is transferred to the low-temperature materials in the heat exchanger, so that the temperature of the materials after distillation processing can be initially reduced, reducing the subsequent cooling time of the materials after distillation processing and the amount of circulating water used during cooling, and reducing the heating and cooling costs of the materials for distillation processing.

[0009] Preferably, as an improvement, the heat exchanger includes two support plates and multiple heat exchange plates, the multiple heat exchange plates are located between the two support plates, the support plates and the heat exchange plates are stacked in sequence; a heat exchange groove is provided on one side of the heat exchange plate, the heat exchange groove and the adjacent heat exchange plates are stacked to form a heat exchange cavity, and the heat exchange cavity is used to accommodate materials. This allows low-temperature materials and high-temperature materials to fully exchange heat in the heat exchanger, ensuring that the materials can be fully cooled or heated, and improving the efficiency of heat exchange of the materials.

[0010] Preferably, as an improvement, both ends of the heat exchange plate are provided with a first opening, and the first openings on the multiple heat exchange plates are interconnected to form a low-temperature material channel, and the low-temperature material channel is connected to the low-temperature cavity, so that the material to be distilled can flow normally in the heat exchanger, which is convenient for realizing continuous heat exchange treatment of the material.

[0011] Preferably, as an improvement, two ends of the low-temperature material channel are respectively connected to the first input port and the first output port.

[0012] Preferably, as an improvement, both ends of the heat exchange plate are provided with a second opening, and the second openings on a plurality of heat exchange plates are interconnected to form a high-temperature material channel, and the high-temperature material channel is connected to the high-temperature cavity, so that the material after distillation can flow normally in the heat exchanger, which is convenient for realizing continuous heat exchange treatment of the material.

[0013] Preferably, as an improvement, two ends of the high-temperature material channel are connected to the second input port and the second output port respectively.

[0014] Preferably, as an improvement, a sealing gasket is laid around the circumference of the heat exchange plate to ensure that the materials in the high-temperature cavity and the low-temperature cavity in the heat exchanger can be isolated from each other, avoiding leakage of materials in the heat exchanger and causing mixing of materials before and after distillation processing.

[0015] Preferably, as an improvement, a compensating heater is further provided between the first output port and the distillation tower, and the compensating heater is used to perform compensatory heating on the material, so that after the material is preliminarily heated in the heat exchanger, it can exchange heat with the steam water pipe in the compensating heater, ensuring that the material can be heated to a preset temperature when input into the distillation tower, and can reduce the amount of steam water used when heating the material.

[0016] Preferably, as an improvement, the second output port is also connected to a compensating cooler, which is used to compensate for cooling the material, so that the high-temperature material exchanges heat with the low-temperature material, and the high-temperature material is initially cooled, and then cooled by the compensating cooler, so as to ensure that the temperature of the material after distillation can be reduced to a preset temperature, while reducing the amount of circulating water used when cooling the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the energy-saving heat exchange structure of the distillation tower in the embodiment of the utility model.

[0018] Figure 2 It is a schematic diagram of the structure of the heat exchanger in the embodiment of the utility model. DETAILED DESCRIPTION

[0019] The following is further described in detail through specific implementation methods:

[0020] The figure marks in the drawings of the specification include: distillation tower 1, feed port 101, discharge port 102, heat exchanger 2, support plate 201, heat exchange plate 202, heat exchange groove 203, first opening 204, second opening 205, first input port 206, second input port 207, first output port 208, second output port 209, first feed pipe 3, second feed pipe 4, first discharge pipe 5, second discharge pipe 6, compensation heater 7, steam water pipe 701, compensation cooler 8, circulating water pipe 801.

[0021] As attached Figure 1 As shown, an energy-saving heat exchange structure for a distillation tower includes a distillation tower 1 and a heat exchanger 2. The heat exchanger 2 is used to heat up and cool down the input material and the output material of the distillation tower 1.

[0022] A distillation chamber is provided in the distillation tower 1, and a feed port 101 and a discharge port 102 are provided at both ends of the distillation tower 1. The feed port 101 and the discharge port 102 are both connected to the distillation chamber. The feed port 101 is used to input materials into the distillation chamber for distillation processing, and the discharge port 102 is used to output the materials processed in the distillation chamber. The specific structure of the distillation tower 1 is prior art and will not be described in detail here.

[0023] As attached Figure 2As shown, the heat exchanger 2 includes two support plates 201 and a plurality of heat exchange plates 202, the plurality of heat exchange plates 202 are all located between the two support plates 201, and the support plates 201 and the heat exchange plates 202 are stacked in sequence. A heat exchange groove 203 is provided on one side of the heat exchange plate 202, the width of the heat exchange groove 203 matches the width of the heat exchange plate 202, and both ends of the heat exchange groove 203 extend to both ends of the heat exchange plate 202; a sealing gasket is laid around the circumference of the heat exchange plate 202, and the heat exchange groove 203 and the adjacent heat exchange plates 202 are stacked to form a sealed heat exchange cavity, which is used to contain heat exchange materials. A first opening 204 and a second opening 205 are provided at both ends of the heat exchange plate 202. The first opening 204 and the second opening 205 are spaced apart from each other. The first openings 204 on the multiple heat exchange plates 202 are interconnected to form a low-temperature material channel. The second openings 205 on the multiple heat exchange plates 202 are interconnected to form a high-temperature material channel. The low-temperature material channel is used for the circulation of low-temperature materials, and the high-temperature material is used for the circulation of high-temperature materials. The heat exchange chamber includes a low-temperature chamber and a high-temperature chamber. The low-temperature chamber and the high-temperature chamber are spaced apart from each other. The two ends of the low-temperature chamber are respectively connected to the low-temperature material channel through the first opening 204. The low-temperature material channel is used for the input and output of low-temperature materials in the low-temperature chamber. The two ends of the high-temperature chamber are respectively connected to the high-temperature material channel through the second opening 205. The high-temperature material channel is used for the input and output of high-temperature materials in the high-temperature chamber. The low-temperature material and the high-temperature material can fully exchange heat in the heat exchanger 2, ensuring that the material can be fully cooled or heated, and improving the efficiency of heat exchange of the material.

[0024] A plurality of grooves are formed on the surfaces of both sides of the heat exchange plate 202, and the grooves are evenly distributed on the surface of the heat exchange plate 202. When the material exchanges heat in the heat exchanger 2, the contact area between the material and the heat exchange plate 202 can be increased, the heat exchange area between the high-temperature material and the low-temperature material can be increased, and the heat exchange effect between the high-temperature material and the low-temperature material can be improved.

[0025] The support plate 201 on one side of the heat exchanger 2 is provided with a first input port 206, a second input port 207, a first output port 208 and a second output port 209, wherein the first input port 206 and the first output port 208 are respectively connected to the two ends of the low-temperature material channel, and the second input port 207 and the second output port 209 are respectively connected to the two ends of the high-temperature material channel. The first input port 206 is connected to the first material delivery pipe 3, and the first material delivery pipe 3 is used to deliver the material to be distilled through the first input port 206 to the heat exchanger 2 for heating; the first output port 208 is connected to the input port of the distillation tower 1 through the second material delivery pipe 4, and the first output port 208 is used to deliver the material heated in the heat exchanger 2 to the distillation tower 1 for distillation. The second input port 207 is connected to the output port of the distillation tower 1 through the first discharge pipe 5, and the second input port 207 is used to transport the material processed by the distillation tower 1 to the heat exchanger 2 for cooling; the second output port 209 is connected to the second discharge pipe 6, and the second output port 209 is used to output the material processed by the distillation to the next processing step. This allows the high-temperature material and the low-temperature material to be input and output in the heat exchanger 2 normally and orderly, ensuring that the heat exchanger 2 can continuously perform heat exchange treatment on the material.

[0026] A compensating heater 7 is also provided between the first output port 208 and the feed port 101 of the distillation tower 1. A steam water pipe 701 is provided in the compensating heater 7. Both ends of the steam water pipe 701 are connected to a steam water circulation device. The steam water pipe 701 and the second feed pipe 4 are intertwined and distributed with each other, and the steam water pipe 701 is connected to the surface of the second feed pipe 4 by heat conduction. The compensating heater 7 is used to perform compensatory heating on the material. After the material is preliminarily heated in the heat exchanger 2, it can exchange heat with the steam water pipe 701 in the compensating heater 7, ensuring that the material can be heated to a preset temperature when it is input into the distillation tower 1, and the amount of steam water used when heating the material can be reduced.

[0027] A compensating cooler 8 is also provided on the second discharge pipe 6. A circulating water pipe 801 is provided inside the compensating cooler 8. Both ends of the circulating water pipe 801 are connected to the cooling water circulation device. The circulating water pipe 801 and the second discharge pipe 6 are intertwined and distributed, and the circulating water pipe 801 is connected to the surface of the second discharge pipe 6 by heat conduction. The compensating cooler 8 is used to perform compensatory cooling of the material. The high-temperature material exchanges heat with the low-temperature material, and the high-temperature material is initially cooled, and then cooled by the compensating cooler 8, so as to ensure that the temperature of the material after the distillation process can be reduced to the preset temperature, while reducing the amount of circulating water used when cooling the material.

[0028] The specific implementation process is as follows:

[0029] When the material is distilled, the material to be distilled is transported to the heat exchanger 2 through the first feed pipe 3 for heating, and the heated material is transported to the distillation tower 1 through the second feed pipe 4. During the transportation process of the second feed pipe 4, the material exchanges heat with the steam water in the compensation heater 7 to achieve the compensation heating of the material, and then the material is transported to the distillation tower 1 for distillation. The material after the distillation process is transported to the heat exchanger 2 through the first discharge pipe 5 for cooling, and the cooled material is transported to the next process through the second discharge pipe 6. During the transportation process of the second discharge pipe 6, the distilled material exchanges heat with the circulating water in the compensation cooler 8 to achieve the compensation cooling of the material. When the heat exchanger 2 heats and cools the material, it exchanges heat with the material before and after the distillation, so that the heat in the high-temperature material after the distillation is transferred to the low-temperature material before the distillation to complete the heating and cooling of the material.

[0030] Compared with the prior art, this solution, when heating and cooling the materials for distillation processing, realizes the reuse of heat applied to the materials during the distillation processing by exchanging heat between the low-temperature materials before distillation processing and the high-temperature materials after distillation processing, thereby improving the utilization rate of resources; and the high-temperature materials after distillation processing are used to heat the materials to be distilled. Since the temperature of the materials after distillation processing can reach above 115°C, which is much higher than the 95°C of traditional distilled high-temperature water, the heating efficiency is higher when heating the materials, shortening the heating time of the materials, and reducing the amount of steam water used when heating the materials. In addition, the temperature of the materials after distillation processing is transferred to the low-temperature materials in the heat exchanger 2, so that the temperature of the materials after distillation processing can be initially reduced, reducing the subsequent cooling time of the materials after distillation processing and the amount of circulating water used during cooling, and reducing the heating and cooling costs of the distillation processing of the materials.

[0031] The above are only embodiments of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution are not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the technical solution of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An energy-saving heat exchange structure for a distillation tower, characterized in that: It includes a distillation tower and a heat exchanger, wherein a plurality of low-temperature chambers and a plurality of high-temperature chambers are arranged in the heat exchanger, and the low-temperature chambers and the high-temperature chambers are staggered; a first input port, a first output port, a second input port and a second output port are opened on the heat exchanger, the first input port and the first output port are connected to the low-temperature chamber, the first input port is used to transport the material to be distilled into the low-temperature chamber, and the first output port is connected to the feed port of the distillation tower; the second input port and the second output port are connected to the high-temperature chamber, the second input port is connected to the discharge port of the distillation tower, the second input port is used to transport the material after distillation to the high-temperature chamber, and the second output port is used to output the material in the high-temperature chamber.

2. The energy-saving heat exchange structure for a distillation tower according to claim 1, characterized in that: The heat exchanger includes two support plates and multiple heat exchange plates, the multiple heat exchange plates are located between the two support plates, and the support plates and the heat exchange plates are stacked in sequence; a heat exchange groove is opened on one side of the heat exchange plate, and the heat exchange groove and the adjacent heat exchange plates are stacked to form a heat exchange cavity, and the heat exchange cavity is used to accommodate materials.

3. The energy-saving heat exchange structure for a distillation tower according to claim 2, characterized in that: Both ends of the heat exchange plate are provided with a first opening, and the first openings on a plurality of heat exchange plates are interconnected to form a low-temperature material channel, and the low-temperature material channel is connected to the low-temperature cavity.

4. The energy-saving heat exchange structure for a distillation tower according to claim 3, characterized in that: Two ends of the low-temperature material channel are respectively communicated with the first input port and the first output port.

5. The energy-saving heat exchange structure for a distillation tower according to claim 2, characterized in that: Both ends of the heat exchange plate are provided with a second opening, and the second openings on a plurality of heat exchange plates are interconnected to form a high-temperature material channel, and the high-temperature material channel is connected to the high-temperature cavity.

6. The energy-saving heat exchange structure for a distillation tower according to claim 5, characterized in that: Two ends of the high-temperature material channel are respectively communicated with the second input port and the second output port.

7. The energy-saving heat exchange structure for a distillation tower according to claim 2, characterized in that: A sealing gasket is laid around the circumference of the heat exchange plate.

8. The energy-saving heat exchange structure for a distillation tower according to claim 1, characterized in that: A compensating heater is also provided between the first output port and the distillation tower, and the compensating heater is used for compensating heating of the material.

9. The energy-saving heat exchange structure for a distillation tower according to claim 1, characterized in that: The second output port is also connected to a compensating cooler, and the compensating cooler is used to perform compensating cooling on the material.

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