Liquid rectification device

Abstract

The utility model relates to the technical field of liquid rectification, and discloses a liquid rectification device. Comprising a preheating unit, a condensing unit, a rectifying unit, a heating unit and a collecting unit, the rectifying unit comprises a first-section rectifying tower, a second-section rectifying tower and a stripping section tower body, the heating unit comprises a reboiler and an evaporator, the collecting unit comprises a reflux distributor and a middle buffer tank, and the preheating unit comprises a first-stage preheater and a second-stage preheater. By means of the condensing unit and the preheating unit, heat released by condensed steam is conducted to the first-stage preheater, liquid is heated in advance when entering the device, then the liquid is further heated through the second-stage preheater, and therefore the heating requirement of a reboiler part is lowered, and the reboiler usually adopts fossil energy or electric energy to meet the heating requirement. Through the combination of the condensation unit and the preheating unit, the energy utilization efficiency is effectively improved, the consumption of fossil and electric energy is reduced, the environmental pollution is reduced, and the utilization of waste heat energy is optimized.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid distillation, in particular to a liquid distillation device. Background Art

[0002] Liquid distillation is a common separation technology in chemical production, widely used in industries such as petrochemicals, pharmaceuticals, and fine chemicals. The basic principle of distillation is to exploit the differences in volatility (boiling points) among the components in a liquid mixture. Heating partially vaporizes the liquid, and then condenses the components in the vapor phase to separate them. Compared to other separation methods, such as extraction, adsorption, or membrane separation, distillation offers higher efficiency and economic benefits for separating liquid mixtures with different boiling points. The core principles of distillation are thermodynamic equilibrium and phase equilibrium. When a liquid is heated, components with lower boiling points tend to vaporize more easily and enter the vapor phase, while components with higher boiling points tend to remain in the liquid phase. Through a multi-stage separation process (typically conducted within a tower), the liquid and gas come into repeated contact, gradually concentrating lower-boiling-point components at the top of the tower and higher-boiling-point components at the bottom, thereby achieving the separation of high-purity components. As industrial demand increases, distillation technology continues to advance. Traditional distillation units suffer from high energy consumption and high operating costs. Energy consumption is primarily concentrated in the reboiler and condenser, particularly when high reflux ratios or multi-stage separation are required. This high energy consumption not only increases operating costs but also places a certain strain on the environment. Reducing energy consumption has become a key issue in optimizing distillation units.

[0003] Therefore, it is necessary to design a liquid distillation device to solve the problems existing in the current technology. Utility Model Content

[0004] In view of this, the present invention proposes a liquid distillation device, which aims to solve the design and use of existing liquid distillation devices to cope with the problems of high energy consumption, high operating costs and environmental pollution.

[0005] The utility model provides a liquid distillation device, comprising:

[0006] Preheating unit, condensing unit, distillation unit, heating unit and collecting unit;

[0007] The distillation unit comprises: a first-stage distillation tower, a second-stage distillation tower and a stripping tower body;

[0008] The heating unit comprises: a reboiler and an evaporator;

[0009] The collection unit includes: a reflux distributor and an intermediate buffer tank,

[0010] The preheating unit includes: a primary preheater and a secondary preheater, wherein the secondary preheater is connected to one end of a preheating pipe, the other end of the preheating pipe passes through the lower wall of the first stage of the distillation tower, and the other end of the preheating pipe extends into the interior of the first stage of the distillation tower;

[0011] The bottom of the first-stage preheater is fixedly connected to the top of the condensing unit, the bottom of the condensing unit is connected to one end of a straight pipe, the other end of the straight pipe passes through the upper surface of the intermediate buffer tank, and the other end of the straight pipe extends to the interior of the intermediate buffer tank.

[0012] Furthermore, a liquid distillation device comprises:

[0013] The upper part of the reboiler is connected to one end of a pipe, the other end of the pipe passes through the middle wall of the evaporator, and the other end of the pipe extends to the interior of the evaporator. The lower part of the reboiler is connected to one end of a curved pipe, and the other end of the curved pipe passes through the lower surface of the evaporator.

[0014] Furthermore, a liquid distillation device comprises:

[0015] The top of the evaporator is fixedly connected to the bottom of the stripping section tower body, the top of the stripping section tower body is fixedly connected to the bottom of the first-stage distillation tower, and the top of the first-stage distillation tower is fixedly connected to the bottom of the second-stage distillation tower;

[0016] The top of the second-stage distillation tower is fixedly connected to the bottom of the reflux distributor, and the top of the reflux distributor and the top of the first-stage preheater are connected through a secondary steam pipe.

[0017] Furthermore, a liquid distillation device comprises:

[0018] A liquid inlet distributor is provided at the lower part of the first stage of the distillation tower, and the liquid inlet distributor is closely fitted to the inner wall of the first stage of the distillation tower.

[0019] Furthermore, a liquid distillation device comprises:

[0020] The top of the intermediate buffer tank is connected to one end of the exhaust gas pipeline, and the other end of the exhaust gas pipeline is connected to the exhaust gas cooler.

[0021] Furthermore, a liquid distillation device comprises:

[0022] The reflux distributor is provided with a multi-stage right-angle pipe, the reflux distributor is connected to one end of the multi-stage right-angle pipe, one end of the multi-stage right-angle pipe extends to the interior of the reflux distributor, and the other end of the multi-stage right-angle pipe is connected to the discharge pipe.

[0023] Furthermore, a liquid distillation device comprises:

[0024] A reflux pipe is provided at the bottom of the intermediate buffer tank. The bottom of the intermediate buffer tank is connected to one end of the reflux pipe, and the other end of the reflux pipe is connected to a reflux pump module.

[0025] Furthermore, a liquid distillation device comprises:

[0026] The reflux pump module is provided with a discharge pipe, the reflux pump module is connected to one end of the discharge pipe, and the other end of the discharge pipe is connected to the top of the coiled tube cooler.

[0027] Furthermore, a liquid distillation device comprises:

[0028] The first-stage preheater is provided with a single-stage right-angle pipe, the first-stage preheater is connected to one end of the single-stage right-angle pipe, one end of the single-stage right-angle pipe extends to the interior of the first-stage preheater, and the other end of the single-stage right-angle pipe is connected to the feed pump module.

[0029] Furthermore, a liquid distillation device comprises:

[0030] The bottom of the condensing unit is provided with a liquid inlet hole and a liquid outlet hole, the outer surface of the condensing unit is provided with a liquid outlet valve, the multi-stage right-angle pipeline is provided with several reflux valves, and the discharge pipeline is provided with a discharge valve.

[0031] Compared with the prior art, the present invention relates to the technical field of liquid distillation and discloses a liquid distillation device. It includes a preheating unit, a condensing unit, a distillation unit, a heating unit and a collecting unit. The distillation unit includes: a first-stage distillation tower, a second-stage distillation tower and a stripping tower body. The heating unit includes: a reboiler and an evaporator. The collecting unit includes: a reflux distributor and an intermediate buffer tank. The preheating unit includes: a first-stage preheater and a second-stage preheater. The second-stage preheater is connected to one end of the preheating pipe, and the other end of the preheating pipe passes through the lower wall of the first-stage distillation tower. The other end of the preheating pipe extends to the interior of the first-stage distillation tower. The bottom of the first-stage preheater is fixedly connected to the top of the condensing unit. The bottom of the condensing unit is connected to one end of the straight pipe, and the other end of the straight pipe is connected to the bottom of the condensing unit. One end passes through the upper surface of the intermediate buffer tank, and the other end of the straight pipe extends to the interior of the intermediate buffer tank. Through the condensing unit and the preheating unit, the heat released by the condensed steam is transferred to the first-stage preheater, so that the liquid is preheated when entering the device, and then further heated by the second-stage preheater, thereby reducing the heating demand of the reboiler part. The reboiler often uses fossil energy or electric energy to meet the heating demand. Through the combination of the condensing unit and the preheating unit, the energy utilization efficiency is effectively improved, the consumption of fossil energy and electric energy is reduced, the pollution to the environment is reduced, and the utilization of waste heat energy is optimized. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0033] Figure 1 A schematic structural diagram of a liquid distillation device provided in an embodiment of the present utility model;

[0034] In the figure: 1. Reboiler; 2. Evaporator; 3. Distillation section tower body; 4. Secondary preheater; 5. Liquid inlet distributor; 6. First-stage distillation tower; 7. Second-stage distillation tower; 8. Reflux distributor; 9. Secondary steam pipe; 10. First-stage preheater; 11. Condensing unit; 12. Spiral coil cooler; 13. Tail gas cooler; 14. Intermediate buffer tank; 15. Feed pump module; 16. Reflux pump module. DETAILED DESCRIPTION

[0035] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0036] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0037] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0039] See Figure 1 As shown, this embodiment provides a liquid distillation device, comprising:

[0040] A preheating unit, a condensing unit 11, a distillation unit, a heating unit and a collecting unit. The distillation unit includes: a first-stage distillation tower 6, a second-stage distillation tower 7 and a stripping section tower body 3. The heating unit includes: a reboiler 1 and an evaporator 2. The collecting unit includes: a reflux distributor 8 and an intermediate buffer tank 14. The preheating unit includes: a first-stage preheater 10 and a second-stage preheater 4. The second-stage preheater 4 is connected to one end of a preheating pipe, the other end of which passes through the lower wall of the first-stage distillation tower 6, and the other end of the preheating pipe extends into the interior of the first-stage distillation tower 6.

[0041] Specifically, a liquid distillation device involves multiple unit operations, including a preheating unit, a condensing unit 11, a distillation unit, a heating unit, and a collection unit. These units are tightly connected by pipes to form a complete liquid distillation process device for efficiently separating different components in a mixture. Through multi-stage heat exchange and distillation processes, complex mixtures are separated and purified. The preheating unit, heating unit, and condensing unit 11 ensure the efficiency and stability of the operation through heat exchange, reflux control, and other methods. The entire device achieves orderly flow of liquid and full utilization of energy through reasonable pipe layout and fluid distribution. The preheating unit includes a first-level preheater 10 and a second-level preheater 4. The function of this unit is to use waste heat or intermediate steam to preheat the feed entering the distillation tower, increase its temperature, and reduce the amount of heating required by the reboiler 1. In this device, the second-level preheater 4 is connected to a distillation tower 6 via a preheating pipe, and the preheated liquid enters the tower directly. The setting of the preheating unit enables the device to save external energy while improving distillation efficiency. The distillation unit mainly includes a first-stage distillation tower 6 and a second-stage distillation tower 7. The mixture is distilled in the tower, with the light components moving upward and the heavy components settling downward. At the bottom of the second-stage distillation tower 7, the distilled liquid enters the first-stage distillation tower 6 for further distillation to ensure product purity. The condensation unit 11 is located below the primary preheater 10, and its function is to condense the steam discharged from the top of the distillation tower into liquid. The design of the condensation unit 11 enables the recovered condensate to be reused. The combination of the condensation unit 11 and the preheating unit effectively improves energy utilization efficiency.

[0042] It is understood that the preheating unit includes a primary preheater 10 and a secondary preheater 4. The function of this unit is to use waste heat or intermediate steam to preheat the feed entering the distillation column, raising its temperature and reducing the amount of heating required by the reboiler 1. The condensing unit 11 is located below the primary preheater 10. Its function is to condense the steam discharged from the top of the distillation column into liquid. The design of the condensing unit 11 allows the recovered condensate to be reused. By condensing the steam discharged from the top of the distillation column into liquid, the condensing unit 11 not only condenses the steam but also transfers the released heat to the primary preheater 10. The liquid is preheated before entering the device and is further heated by the secondary preheater 4, thereby reducing the heating requirements of the reboiler 1. The reboiler 1 often uses fossil energy or electric energy to meet its heating needs. The combination of the condensing unit 11 and the preheating unit effectively improves energy utilization efficiency, reduces the consumption of fossil energy and electric energy, reduces environmental pollution, and optimizes the utilization of waste heat energy.

[0043] In some examples of the present application, a liquid distillation apparatus includes:

[0044] The upper part of the reboiler 1 is connected to one end of the pipe, the other end of the pipe passes through the middle wall of the evaporator 2, and the other end of the pipe extends to the interior of the evaporator 2. The lower part of the reboiler 1 is connected to one end of the arc-shaped pipe, and the other end of the arc-shaped pipe passes through the lower surface of the evaporator 2.

[0045] As you can understand, the heating unit comprises a reboiler 1 and an evaporator 2. Reboiler 1 generates steam through heating. Its upper portion is connected to the middle wall of evaporator 2 via a pipe that extends into the interior of evaporator 2, allowing the steam to fully participate in the evaporation and stripping processes. Furthermore, the lower portion of reboiler 1 is connected to the bottom of evaporator 2 via an arc-shaped pipe, ensuring stable circulation and heating of the liquid. The function of evaporator 2 is to evaporate the liquid into gas for subsequent stripping and rectification operations.

[0046] In some examples of the present application, a liquid distillation apparatus includes:

[0047] The top of the evaporator 2 is fixedly connected to the bottom of the distillation section tower body 3, the top of the distillation section tower body 3 is fixedly connected to the bottom of the first-stage distillation tower 6, the top of the first-stage distillation tower 6 is fixedly connected to the bottom of the second-stage distillation tower 7, the top of the second-stage distillation tower 7 is fixedly connected to the bottom of the reflux distributor 8, and the top of the reflux distributor 8 and the top of the primary preheater 10 are connected through a secondary steam pipe 9.

[0048] It can be understood that the distillation unit includes: a first-stage distillation tower 6, a second-stage distillation tower 7 and a stripping section tower body 3, and the collection unit includes: a reflux distributor 8 and an intermediate buffer tank 14. The distillation unit achieves precise component purification through multi-stage separation. The stripping section tower body 3 is located at the top of the evaporator 2 and is connected to the bottom of the first-stage distillation tower 6. Its main function is to perform preliminary stripping on the steam generated from the evaporator 2 and provide a stable steam flow for the subsequent distillation process. The close connection between the stripping section tower body 3, the evaporator 2 and the first-stage distillation tower 6 ensures the continuous flow of the liquid and the smooth progress of the separation process. The reflux distributor 8 of the collection unit is located at the top of the second-stage distillation tower 7 and is used to control the reflux ratio. It is connected to the top of the first-stage preheater 10 and realizes heat recovery and distribution through the secondary steam pipe 9. The precise control of the reflux distributor 8 helps to optimize the separation effect in the tower while further reducing energy consumption.

[0049] In some examples of the present application, a liquid distillation apparatus includes:

[0050] A liquid inlet distributor 5 is provided at the lower portion of the first stage distillation tower 6 , and the liquid inlet distributor 5 is closely fitted to the inner wall of the first stage distillation tower 6 .

[0051] Specifically, the liquid inlet distributor 5 plays a key role in the first section of the distillation tower 6, especially in the lower part of the first section of the distillation tower 6. Its main function is to ensure the uniform distribution of liquid in the tower cross section, thereby improving the efficiency of the distillation process. The design and layout of the liquid inlet distributor 5 have a direct impact on the fluid dynamics, transfer efficiency and distillation effect in the tower. The primary function of the liquid inlet distributor 5 is to evenly distribute the liquid entering the bottom of the tower to the entire tower cross section. If the liquid is unevenly distributed, some areas may experience liquid overflow, flooding or insufficient liquid flow, affecting the efficiency of distillation. Moreover, if the liquid is not evenly distributed, "dead zones" may be formed in certain areas of the tower. The liquid in these areas cannot effectively participate in the transfer, resulting in incomplete distillation of the liquid in the tower and reducing the purity of the product. The liquid inlet distributor 5 ensures the uniform flow of liquid in the tower, promotes sufficient contact between gas and liquid, increases the effective contact area, thereby improving the mass transfer efficiency in the tower and making the distillation effect more significant.

[0052] It is understandable that the liquid inlet distributor 5 fits tightly against the inner wall of a section of the distillation tower 6. This design is to avoid leakage or uneven flow of liquid near the tower wall. The aperture, slot size and position of the liquid inlet distributor 5 need to be precisely designed according to the liquid flow rate to ensure uniform coverage of the liquid on the entire tower cross section. In addition, corrosive substances or high-temperature environments may be involved in the distillation process. The liquid inlet distributor 5 is made of materials with good corrosion resistance and high-temperature resistance. If there is a gap between the liquid inlet distributor 5 and the inner wall, impurities and sediments may accumulate in these gaps to form stubborn blockages. The design that fits tightly against the inner wall eliminates these gaps and reduces the possibility of impurity accumulation. The position and design of the liquid inlet distributor 5 take into account subsequent cleaning and maintenance to prevent blockage or scaling of the liquid channel, reduce the frequency of shutdown maintenance, and thus extend the service life of the device.

[0053] In some examples of the present application, a liquid distillation apparatus includes:

[0054] The top of the intermediate buffer tank 14 is connected to one end of the exhaust gas pipeline, and the other end of the exhaust gas pipeline is connected to the exhaust gas cooler 13 .

[0055] It is understandable that the top of the intermediate buffer tank 14 is connected to the exhaust gas pipe, which is used to discharge or treat the exhaust gas generated in the intermediate buffer tank 14. The other end of the exhaust gas pipe is connected to the exhaust gas cooler 13, and the waste exhaust gas is transported to the exhaust gas cooler 13 through the exhaust gas pipe for cooling treatment. The function of the exhaust gas cooler 13 is to reduce the temperature of the exhaust gas and liquefy the liquefiable components therein, thereby reducing the exhaust gas emissions and recovering some useful substances. Such a design not only helps to protect the environment, but also improves the safety and operational stability of the device. The entire exhaust gas treatment process ensures the smooth operation of the device and meets environmental protection requirements.

[0056] In some examples of the present application, a liquid distillation apparatus includes:

[0057] The reflux distributor 8 is provided with a multi-stage right-angle pipe, the reflux distributor 8 is connected to one end of the multi-stage right-angle pipe, one end of the multi-stage right-angle pipe extends to the interior of the reflux distributor 8, and the other end of the multi-stage right-angle pipe is connected to the discharge pipe.

[0058] Specifically, the reflux distributor 8 is an important device for evenly distributing the reflux liquid in the distillation tower. In order to better control the distribution of the reflux liquid, a multi-stage right-angle pipe is set on the reflux distributor 8. The design of the multi-stage right-angle pipe plays a key role in ensuring the uniform distribution of the liquid and the stable operation of the device. The multi-stage right-angle pipe is composed of a series of pipes with 90-degree turns. One end of these pipes extends to the interior of the reflux distributor 8, and the other end is connected to the discharge pipe. The multi-stage right-angle pipe is used for the reflux of the liquid, and the reflux distributor 8 ensures that the reflux liquid can be evenly covered on the entire tower cross-section. In the distillation tower, the reflux liquid needs to be evenly distributed in the tower to ensure effective exchange of the gas-liquid mixture. The multi-stage right-angle pipe makes multiple 90-degree turns to allow the liquid to flow through different heights and positions, thereby minimizing the problem of local concentration of the liquid in the pipe. The design of the multi-stage right-angle pipe can adjust the speed and direction of the liquid flow, prevent the liquid from directly impacting a specific area, and ensure that the liquid can smoothly return to the reflux distributor 8.

[0059] It is understandable that the design of the multi-stage right-angle pipeline has the effect of slowing down the flow rate of the liquid and reducing the impact of kinetic energy. After the reflux liquid passes through the multi-stage right-angle pipeline, the flow rate of the liquid gradually decreases and the kinetic energy is dispersed, thereby avoiding the liquid from directly impacting the reflux distributor 8, avoiding the formation of liquid flooding or excessive disturbance, and affecting the distillation efficiency. The design of the multi-stage right-angle pipeline can be adjusted according to process requirements to maintain the stability of the device operation. Moreover, the design of the multi-stage right-angle pipeline is easy to maintain and clean. Since these pipelines are standardized components, they can be quickly disassembled and replaced during cleaning or maintenance, reducing the downtime of the device. In addition, the right-angle turn design in the pipeline can avoid the accumulation of liquid inside the pipeline and reduce the possibility of scaling and blockage. The combined design of the reflux distributor 8 and the multi-stage right-angle pipeline can not only effectively distribute the reflux liquid in the distillation tower, but also optimize the gas-liquid contact conditions by reasonably controlling the liquid flow rate, distribution area and kinetic energy, thereby improving the distillation efficiency.

[0060] In some examples of the present application, a liquid distillation apparatus includes:

[0061] A reflux pipe is provided at the bottom of the intermediate buffer tank 14 . The bottom of the intermediate buffer tank 14 is connected to one end of the reflux pipe, and the other end of the reflux pipe is connected to the reflux pump module 16 .

[0062] Specifically, the bottom of the intermediate buffer tank 14 is the main area for liquid collection, and the liquid level is usually relatively stable. One end of the reflux pipe is directly connected to the bottom of the buffer tank to ensure that it can fully contact the liquid in the tank. The other end of the reflux pipe is connected to the reflux pump module 16, and the liquid is refluxed into the multi-stage right-angle pipe by the power of the reflux pump module 16. The main function of the reflux pipe is to return the liquid to the distillation process to form a cycle. Such a design helps to further purify the liquid distillation and avoid the situation where local liquid accumulation or low liquid level leads to insufficient distillation. At the same time, the flow rate of the reflux liquid can be accurately controlled by the reflux pump module 16. The intermediate buffer tank 14 serves as a transfer station for the liquid. During operation, if the flow rate of the upstream liquid fluctuates, the intermediate buffer tank 14 can adjust the flow rate of the liquid entering the downstream through the reflux pipe, thereby ensuring the stability of the reflux of the entire device. The reflux pump module 16 ensures the stability of the reflux of the reflux liquid in the device by controlling the reflux speed and flow rate.

[0063] As can be appreciated, the reflux line at the bottom of the intermediate buffer tank 14 and its connected reflux pump module 16 provide regulation, stabilization, and circulation within the distillation process. This not only optimizes liquid flow and distribution but also enhances the flexibility and operational efficiency of the system. Effective reflux ensures the stability of the distillation process, further purifying the liquid while reducing the risk of failures caused by flow fluctuations or changing operating conditions.

[0064] In some examples of the present application, a liquid distillation apparatus includes:

[0065] The reflux pump module 16 is provided with a discharge pipe. The reflux pump module 16 is connected to one end of the discharge pipe, and the other end of the discharge pipe is connected to the top of the coiled tube cooler 12 .

[0066] It is understandable that in the distillation process, the reflux pump module 16 is responsible for extracting the liquid from the intermediate buffer tank 14 and transporting it to the multi-stage right-angle pipe. The reflux pump module 16 is provided with a discharge pipe, and the liquid is transported from the reflux pump module 16 through the discharge pipe to the coiled tube cooler 12. Specifically, one end of the discharge pipe is connected to the reflux pump module 16, and the other end is connected to the top of the coiled tube cooler 12. The liquid enters the coiled tube cooler 12 through the discharge pipe, and when flowing in the coiled tube cooler 12, the temperature is further reduced through heat exchange with the cooling medium, so that any effective gas that may exist is converted into liquid. The pipes in the coiled tube cooler 12 are designed to be spiral, which increases the heat exchange area and ensures that the liquid is fully cooled and reaches the temperature required by the process. Through this design, the cooled liquid can continue to enter the subsequent process flow stably.

[0067] In some examples of the present application, a liquid distillation apparatus includes:

[0068] The first-stage preheater 10 is provided with a single-stage right-angle pipe, which is connected to one end of the single-stage right-angle pipe. One end of the single-stage right-angle pipe extends to the interior of the first-stage preheater 10, and the other end of the single-stage right-angle pipe is connected to the feed pump module 15.

[0069] Specifically, the first-stage preheater 10 is an important component for preliminarily heating the feed in the distillation device. It increases the liquid temperature through effective heat exchange to reduce the use of the reboiler 1. In the first-stage preheater 10, a single-stage right-angle pipe is provided, which is responsible for transporting the liquid to the interior of the first-stage preheater 10 for heating. The first-stage preheater 10 is connected to the single-stage right-angle pipe, and one end of the single-stage right-angle pipe extends to the interior of the first-stage preheater 10 to guide the liquid into the heating area. Through the design of the single-stage right-angle pipe, the flow direction of the liquid changes, thereby slowing down the flow rate, ensuring that the liquid has sufficient residence time in the first-stage preheater 10 for effective heating. The other end of the single-stage right-angle pipe is connected to the feed pump module 15, which provides power for the transportation of the material, ensuring that the flow rate is stable and meets the preheating process requirements. Through this connection structure, the material can be smoothly and continuously transported to the first-stage preheater 10 and complete the heating process, thereby improving the overall efficiency of the device and ensuring the stability of the distillation process.

[0070] It is understood that the initial heating of the liquid by the primary preheater 10 before it enters the reboiler 1 can reduce the energy required for the heating process in the reboiler 1. This preheating utilizes waste heat or residual heat from the device, thereby improving overall energy efficiency and reducing energy consumption and costs. Furthermore, preheating allows the liquid to reach a stable temperature upon entering the subsequent distillation unit, helping to ensure consistent distillation process conditions. Large temperature fluctuations can lead to process instability. Preheating the liquid by the primary preheater 10 can mitigate these temperature differences, reduce thermal shock and wear on the downstream device, and improve distillation efficiency and transfer effects. After the liquid is preheated by the primary preheater 10, its viscosity decreases and its fluidity increases, helping to reduce the risk of scaling in the pipeline or device. Liquid with better fluidity can form a more uniform flow within the pipeline, reducing liquid retention in the device, reducing the possibility of scaling, and reducing the need for device maintenance. The preheating process utilizes residual heat from the device, reducing energy waste, and thus lowering both operating costs and environmental impact. Furthermore, improved energy utilization also means lower energy consumption per unit product, which is in line with the goal of energy conservation and emission reduction in modern distillation processes.

[0071] In some examples of the present application, a liquid distillation apparatus includes:

[0072] The bottom of the condensing unit 11 is provided with a liquid inlet and a liquid outlet. The outer surface of the condensing unit 11 is provided with a liquid outlet valve. The multi-stage right-angle pipeline is provided with several reflux valves, and the discharge pipeline is provided with a discharge valve.

[0073] Specifically, the condensing unit 11 is used to cool the gas and convert it into liquid. The bottom of the condensing unit 11 is provided with two openings: a liquid inlet and a liquid outlet. The liquid inlet is used to introduce the condensing medium into the condensing unit 11, and the liquid outlet is used to discharge the waste condensing medium from the condensing unit 11, ensuring that the condensing medium inside the condensing unit 11 can be smoothly discharged and enter subsequent processing. In addition, a liquid outlet valve is also provided on the outer surface of the condensing unit 11. The liquid outlet valve is used to control the outflow of the condensing medium in the condensing unit 11. By adjusting the opening and closing of the valve, the waste condensing medium can be completely discharged, thereby ensuring the efficiency and stability of the condensation process. There are preferably two reflux valves, one of which is a main valve and the other is a grading valve. The main function of the reflux valve provided on the multi-stage right-angle pipeline is to regulate or prevent the reflux of the liquid, ensuring that the liquid enters the reflux distributor 8 according to the predetermined flow direction and flow rate. The reflux valve is opened, and the liquid flows back to the reflux distributor 8 and is further purified by further distillation. If the distillation requirements are met, the reflux valve is closed, and the liquid enters the coiled tube cooler 12 through the discharge pipe. The liquid obtained by cooling the coiled tube cooler 12 is the product required for the final distillation.

[0074] It is understandable that the heat released during the process of converting gas into liquid by the condensing unit 11 is directed to the first preheater to replace part of the heating demand of the reboiler 1. The energy use of the reboiler 1 can be reduced, which not only reduces operating costs but also reduces the impact on the environment. By adjusting the opening and closing of the reflux valve, the reflux volume can be accurately controlled, thereby optimizing the operating efficiency and stability of the device. The reflux valve can also prevent the liquid from backflowing in the multi-stage right-angle pipe, protecting the device from potential damage. In addition, the opening and closing of the reflux valve can determine the purity of the final distillation product. In order to effectively control the fluid discharge after distillation and ensure the stable operation of the device, a discharge valve is provided on the discharge pipe. When the reflux valve is closed, the discharge valve is opened, and the liquid enters the coiled tube cooler 12 through the discharge pipe. The liquid obtained by cooling the coiled tube cooler 12 is the product required for the final distillation. When the reflux valve is open, the discharge valve is closed, and the liquid flows back to the reflux distributor 8 and is further purified by further distillation. When maintenance is required, the reflux valve and the discharge valve are closed to ensure the safety of the pipeline.

[0075] In summary, the present invention relates to the technical field of liquid distillation and discloses a liquid distillation device. It includes a preheating unit, a condensing unit, a distillation unit, a heating unit and a collecting unit. The distillation unit includes: a first-stage distillation tower, a second-stage distillation tower and a stripping tower body. The heating unit includes: a reboiler and an evaporator. The collecting unit includes: a reflux distributor and an intermediate buffer tank. The preheating unit includes: a first-stage preheater and a second-stage preheater. The second-stage preheater is connected to one end of the preheating pipe, and the other end of the preheating pipe passes through the lower wall of the first-stage distillation tower. The other end of the preheating pipe extends to the interior of the first-stage distillation tower. The bottom of the first-stage preheater is fixedly connected to the top of the condensing unit. The bottom of the condensing unit is connected to one end of the straight pipe, and the other end of the straight pipe is connected to the bottom of the condensing unit. One end passes through the upper surface of the intermediate buffer tank, and the other end of the straight pipe extends to the interior of the intermediate buffer tank. Through the condensing unit and the preheating unit, the heat released by the condensed steam is transferred to the first-stage preheater, so that the liquid is preheated when entering the device, and then further heated by the second-stage preheater, thereby reducing the heating demand of the reboiler part. The reboiler often uses fossil energy or electric energy to meet the heating demand. Through the combination of the condensing unit and the preheating unit, the energy utilization efficiency is effectively improved, the consumption of fossil energy and electric energy is reduced, the pollution to the environment is reduced, and the utilization of waste heat energy is optimized.

[0076] Those skilled in the art will understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A liquid distillation device, characterized in that: include: Preheating unit, condensing unit, distillation unit, heating unit and collecting unit; The distillation unit comprises: a first-stage distillation tower, a second-stage distillation tower and a stripping tower body; The heating unit comprises: a reboiler and an evaporator; The collection unit includes: a reflux distributor and an intermediate buffer tank, The preheating unit includes: a primary preheater and a secondary preheater, wherein the secondary preheater is connected to one end of a preheating pipe, the other end of the preheating pipe passes through the lower wall of the first stage of the distillation tower, and the other end of the preheating pipe extends into the interior of the first stage of the distillation tower; The bottom of the first-stage preheater is fixedly connected to the top of the condensing unit, the bottom of the condensing unit is connected to one end of a straight pipe, the other end of the straight pipe passes through the upper surface of the intermediate buffer tank, and the other end of the straight pipe extends to the interior of the intermediate buffer tank.

2. A liquid distillation device according to claim 1, characterized in that: include: The upper part of the reboiler is connected to one end of a pipe, the other end of the pipe passes through the middle wall of the evaporator, and the other end of the pipe extends to the interior of the evaporator. The lower part of the reboiler is connected to one end of a curved pipe, and the other end of the curved pipe passes through the lower surface of the evaporator.

3. A liquid distillation device according to claim 1, characterized in that: include: The top of the evaporator is fixedly connected to the bottom of the stripping section tower body, the top of the stripping section tower body is fixedly connected to the bottom of the first-stage distillation tower, and the top of the first-stage distillation tower is fixedly connected to the bottom of the second-stage distillation tower; The top of the second-stage distillation tower is fixedly connected to the bottom of the reflux distributor, and the top of the reflux distributor and the top of the first-stage preheater are connected through a secondary steam pipe.

4. A liquid distillation device according to claim 1, characterized in that: include: A liquid inlet distributor is provided at the lower part of the first stage of the distillation tower, and the liquid inlet distributor is closely fitted to the inner wall of the first stage of the distillation tower.

5. A liquid distillation device according to claim 1, characterized in that: include: The top of the intermediate buffer tank is connected to one end of the exhaust gas pipeline, and the other end of the exhaust gas pipeline is connected to the exhaust gas cooler.

6. A liquid distillation device according to claim 1, characterized in that: include: The reflux distributor is provided with a multi-stage right-angle pipe, the reflux distributor is connected to one end of the multi-stage right-angle pipe, one end of the multi-stage right-angle pipe extends to the interior of the reflux distributor, and the other end of the multi-stage right-angle pipe is connected to the discharge pipe.

7. A liquid distillation device according to claim 6, characterized in that: include: A reflux pipe is provided at the bottom of the intermediate buffer tank. The bottom of the intermediate buffer tank is connected to one end of the reflux pipe, and the other end of the reflux pipe is connected to a reflux pump module.

8. A liquid distillation device according to claim 7, characterized in that: include: The reflux pump module is provided with a discharge pipe, the reflux pump module is connected to one end of the discharge pipe, and the other end of the discharge pipe is connected to the top of the coiled tube cooler.

9. A liquid distillation device according to claim 8, characterized in that: include: The first-stage preheater is provided with a single-stage right-angle pipe, the first-stage preheater is connected to one end of the single-stage right-angle pipe, one end of the single-stage right-angle pipe extends to the interior of the first-stage preheater, and the other end of the single-stage right-angle pipe is connected to the feed pump module.

10. The liquid distillation device according to claim 9, characterized in that: include: The bottom of the condensing unit is provided with a liquid inlet hole and a liquid outlet hole, the outer surface of the condensing unit is provided with a liquid outlet valve, the multi-stage right-angle pipeline is provided with several reflux valves, and the discharge pipeline is provided with a discharge valve.

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