Negative-pressure self-weight discharging system

Abstract

The utility model belongs to the technical field of reduced pressure distillation, and discloses a negative pressure self-weight discharging system which is characterized in that a fractionation device is connected with an output pipe; a cooling channel and a refrigerant channel are arranged in the condenser, one end of the cooling channel is a fraction inlet, and the other end of the cooling channel is a condensate outlet; a refrigerant outlet and a refrigerant inlet are formed in one end of the refrigerant channel; the refrigerant supply device is respectively communicated with the refrigerant outlet and the refrigerant inlet; the condenser is further provided with an exhaust port communicated with the cooling channel, and the air extractor is communicated with the exhaust port; one end of the large air leg pipe is communicated with the condensate outlet; and the condensate receiving tank is positioned below the atmospheric leg pipe and is hermetically communicated with the atmospheric leg pipe. The negative-pressure self-weight discharging system is less in mounted equipment, low in cost and energy-saving, condensate produced by reduced pressure distillation can be stably and continuously discharged, and the negative-pressure self-weight discharging system is beneficial to a continuous production process.

Description

Technical Field

[0001] This utility model relates to the field of vacuum distillation technology, and more specifically to a negative pressure gravity discharge system. Background Technology

[0002] Vacuum distillation is a common method for separating and purifying organic compounds. It is particularly suitable for substances that decompose, oxidize, or polymerize before reaching their boiling point during atmospheric distillation. It has wide applications in petrochemicals, pharmaceuticals, and food processing, and is commonly used to purify liquid compounds such as phenols, alcohols, aldehydes, and ketones. Furthermore, vacuum distillation can be used to separate two or more components in a mixture, such as oxygen and nitrogen, or ethane and ethanol. The boiling point of a liquid is the temperature at which its vapor pressure equals the external pressure. Therefore, the boiling point of a liquid changes with external pressure. By using a vacuum pump to reduce the pressure within the system, the boiling point of the liquid can be lowered. Vacuum distillation mainly consists of three parts: distillation, condensation, and collection.

[0003] In an atmospheric and vacuum distillation apparatus, the pipe from the condenser outlet to the atmospheric pressure water separator, commonly known as the atmospheric leg, is a gravity-flow pipe. The atmospheric leg is primarily used for sealing, preventing external atmosphere from entering the vacuum system and ensuring a vacuum state. The formula for calculating the height of the liquid seal within the atmospheric leg is H = (Pa - P) / ρg; where Pa - P = vacuum degree, which can be measured using a vacuum gauge, ρ is the density of the generated condensate, and g is the acceleration due to gravity.

[0004] Currently, in industry, the collection of liquid materials from vacuum distillation typically involves first collecting them in a negative pressure receiving tank connected to the condenser outlet. Once the liquid reaches a certain level, it is then pumped to an atmospheric pressure receiving tank using a vacuum discharge pump. This method has the following problems: 1. It involves a large number of devices, resulting in high costs; 2. The vacuum discharge pump starts and stops intermittently, with frequent switching, posing certain safety risks and affecting equipment lifespan; 3. The discharge from the negative pressure tank to the atmospheric pressure tank is intermittent, with unstable liquid levels and flow rates, making it unsuitable for continuous production processes.

[0005] Therefore, this application optimizes the condensation and collection process in vacuum distillation. How to provide a negative pressure gravity discharge system that can reduce equipment costs, enhance the stability of continuous production processes, and enable automatic and continuous discharge of condensate is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] In view of this, the present invention provides a negative pressure gravity discharge system that can reduce equipment costs, enhance the stability of continuous production processes, and enable automatic and continuous discharge of condensate. It can optimize the condensation and collection process of vacuum distillation and improve the condensate collection effect.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A negative pressure gravity discharge system, comprising:

[0009] Condenser bracket;

[0010] A fractionation apparatus, wherein the fraction outlet of the fractionation apparatus is connected to an output pipe;

[0011] A condenser, which is tubular and fixed to a condenser support at both ends with an inclination towards a relative horizontal direction, has a cooling channel and a refrigerant channel inside. One end of the cooling channel is a fraction inlet and the other end is a condensate outlet. One end of the refrigerant channel is a refrigerant outlet and a refrigerant inlet. The fraction inlet corresponds to the high end of the condenser and is connected to the output pipe, while the condensate outlet corresponds to the low end of the condenser.

[0012] A refrigerant supply device, wherein the inlet and outlet of the refrigerant supply device are respectively connected to the refrigerant outlet and the refrigerant inlet through pipes to form a circulation path;

[0013] The condenser is provided with an exhaust port that connects to the cooling channel, and the exhaust port of the exhaust device is connected to the exhaust port through an exhaust pipe.

[0014] An atmospheric leg pipe, wherein the atmospheric leg pipe is arranged vertically and horizontally and one end is connected to the condensate outlet;

[0015] A condensate receiving tank is located below the atmospheric leg pipe and is sealed and connected.

[0016] As can be seen from the above technical solution, compared with the prior art, this utility model discloses a negative pressure gravity discharge system. This system is for the condensation and collection process in a vacuum distillation process. After the condenser is placed, its fraction inlet, condensate inlet, condensate outlet, exhaust port, and condensate outlet are respectively connected to the fractionation device, refrigerant supply device, vacuum pump, and condensate receiving tank. The vacuum pump creates a vacuum in the cooling channel of the condenser, increasing the vacuum degree of the cooling channel. This allows the fraction to be cooled and liquefied, and then flow continuously under negative pressure, ensuring the flow performance of the condensate in the cooling channel. Because the cooling channel is under negative pressure, the condensate in the atmospheric leg pipe returns to the vacuum under the action of external atmospheric pressure. The formula for calculating the height of the liquid returning to the atmospheric leg tube is H = (Pa - P) / ρg, where Pa - P = vacuum degree. The vacuum degree in the cooling channel can be measured by a vacuum gauge, and the density ρ of the generated condensate can be consulted to calculate the maximum height of the liquid seal in the atmospheric leg tube. The total height of the atmospheric leg tube is set to be higher than the height of the liquid seal, so that the liquid in the atmospheric leg forms a water seal and does not flow back into the cooling channel. At the same time, it can prevent external gas from entering the cooling channel through the atmospheric leg and disrupting the vacuum state inside the cooling channel, ensuring that the condensate always flows under negative pressure, improving flow efficiency. Meanwhile, it relies on its own weight to complete automatic discharge, achieving the balance of inflow and outflow of the entire system, and achieving the purpose of stable and continuous discharge of condensate.

[0017] Furthermore, the refrigerant supply device includes:

[0018] A refrigerant outlet tank, the outlet end of which is connected to a refrigerant outlet pipe, and the condensate outlet pipe is connected to the refrigerant inlet;

[0019] A refrigerant collection tank is provided, with a refrigerant recovery pipe connected to its inlet end. The refrigerant recovery pipe is connected to the condensate outlet. The refrigerant collection tank and the refrigerant outlet tank are connected through a circulation pipe. Both the refrigerant collection tank and the refrigerant outlet tank are equipped with a refrigerator. A miniature water pump is installed in the circulation pipe.

[0020] The beneficial effects of adopting the above technical solution are: to form a cycle of refrigerant liquid supply and recycling, to cool down the refrigerant liquid after it has been heated by the refrigerator, and to pump the cooled liquid in the refrigerant collection tank back into the refrigerant outlet tank by the micro water pump, so that the refrigerant liquid can be reused and waste is avoided.

[0021] Furthermore, the air extraction device is a vacuum pump.

[0022] The beneficial effects of adopting the above technical solution are: vacuum pumps are mainly used for cleaning the gas field and have a wide range of applications. Vacuum pumps not only have a high ultimate vacuum, but also have low power consumption and are environmentally friendly and energy-saving, making them very suitable for use in this discharge system.

[0023] Furthermore, the condensate receiving tank is an atmospheric pressure receiving tank, including a shell and a breather valve. The top of the shell has a condensate inlet and a breather valve mounting hole near the condensate inlet. The bottom has a condensate discharge port. The condensate inlet is sealed and connected to the upper end of the atmospheric leg pipe. The breather valve is fixedly installed at the breather valve mounting hole.

[0024] The beneficial effects of adopting the above technical solution are: the breather valve is a safety device to ensure the internal air pressure of the atmospheric pressure receiving tank. It can not only maintain the air pressure balance of the atmospheric pressure receiving tank and ensure that the atmospheric pressure receiving tank is not damaged in the event of overpressure or vacuum, but also minimize the evaporation and discharge of liquid inside the tank and reduce the pollution of the tank by the external environment.

[0025] Furthermore, multiple support brackets are fixedly installed on the shell wall, and a support base is provided at the bottom of the condensate receiving tank and is fixedly connected to the support brackets through the support base.

[0026] The beneficial effects of adopting the above technical solution are: by setting up a receiving tank with a support bracket, it is easy to use with the base, convenient to fix the receiving tank, and convenient to discharge the cold medium liquid inside the tank.

[0027] Furthermore, the exhaust port is located near the refrigerant inlet. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0029] Figure 1 The attached figure is a structural connection diagram of a negative pressure self-weight discharge system provided by this utility model.

[0030] Among them, 1-condenser, 11-fraction inlet, 12-refrigerant outlet, 13-refrigerant inlet, 14-condensate outlet, 15-exhaust port, 2-fractionation device, 21-output pipe, 3-refrigerant supply device, 31-refrigerant outlet tank, 311-refrigerant outlet pipe, 32-refrigerant collection tank, 321-refrigerant recovery pipe, 33-circulation pipeline, 4-vacuum device, 41-vacuum pipe, 5-large air leg pipe, 51-liquid seal, 6-condensate receiving tank, 61-shell, 62-breathing valve, 63-condensate inlet, 64-condensate discharge port, 65-support bracket. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] See Figure 1 As shown, this utility model embodiment discloses a negative pressure gravity discharge system, including: a condenser support; a fractionation device 2, the fraction outlet of the fractionation device 2 being connected to an output pipe 21; a condenser 1 being tubular and its two ends being inclined and fixed on the condenser support in a relatively horizontal direction, the condenser 1 having a cooling channel and a refrigerant channel inside, one end of the cooling channel being a fraction inlet 11 and the other end being a condensate outlet 14; one end of the refrigerant channel being a refrigerant outlet 12 and a refrigerant inlet 13; the fraction inlet 11 corresponding to the high end of the condenser 1 and... The condensate outlet 14 is connected to the lower end of the condenser 1 and is connected to the output pipe 21. The inlet and outlet of the refrigerant supply device 3 are connected to the refrigerant outlet 12 and the refrigerant inlet 13 through pipes to form a circulation path. The condenser 1 is also provided with an exhaust port 15 that connects to the cooling channel. The exhaust port of the air extraction device 4 is connected to the exhaust port 15 through an exhaust pipe 41. The atmospheric leg pipe 5 is arranged vertically and horizontally and one end is connected to the condensate outlet 14. The condensate receiving tank 6 is located below the atmospheric leg pipe 5 and is sealed and connected.

[0033] Specifically, the negative pressure gravity discharge system provided in this application is suitable for the condensation and collection process in vacuum distillation. The atmospheric leg pipe 5 allows external air pressure to force the liquid in the condensate receiving tank 6 back to the top of the atmospheric leg pipe 5, forming a liquid seal 51. The liquid height inside the atmospheric leg pipe 5 can be calculated using the formula H = Pa - P / ρg. The height of the atmospheric leg pipe 5 is then set to be higher than the liquid height. For example, when the liquid is water, the maximum backflow height is calculated to be 10.33m. Therefore, the height of the atmospheric leg pipe 5 can be set to 10.5m.

[0034] One embodiment of the refrigerant supply device 3 in this utility model includes:

[0035] The refrigerant outlet tank 31 has a refrigerant outlet pipe 311 connected to its outlet end, and the refrigerant outlet pipe 311 is connected to the refrigerant inlet 13.

[0036] The refrigerant collection tank 32 has a refrigerant recovery pipe 321 connected to its inlet end. The refrigerant recovery pipe 321 is connected to the condensate outlet 12. The refrigerant collection tank 32 is connected to the refrigerant outlet tank 31 through a circulation pipe 33. Both the refrigerant collection tank 32 and the refrigerant outlet tank 31 are equipped with a refrigerator. A miniature water pump is installed in the circulation pipe 33.

[0037] This system creates a cycle for the supply and recycling of refrigerant liquid. The refrigerant liquid is cooled down by a refrigeration unit, and the cooled liquid in the refrigerant collection tank is pumped back into the refrigerant outlet tank by a micro water pump, allowing the refrigerant liquid to be reused and avoiding waste.

[0038] In one embodiment of this utility model, the air extraction device 4 is a vacuum pump, and the inlet of the vacuum pump is connected to the exhaust port 15 through the air extraction pipe 41. Vacuum pumps are mainly used for cleaning gas fields and have a wide range of applications. Vacuum pumps not only possess high ultimate vacuum but also have low power consumption and are environmentally friendly and energy-saving.

[0039] One embodiment of the condensate receiving tank 6 in this utility model is an atmospheric pressure receiving tank, including a shell 61 and a breather valve 62. The shell 61 has a condensate inlet 63 at the top and a breather valve mounting hole near the condensate inlet 63, and a condensate discharge port 64 at the bottom. The condensate inlet 63 is sealed and connected to the upper end of the refrigerant outlet pipe 5. The breather valve 62 is installed at the breather valve mounting hole. The breather valve 62 is a safety device to ensure the internal pressure of the atmospheric pressure receiving tank 6. It not only maintains the pressure balance of the atmospheric pressure receiving tank 6, ensuring that the atmospheric pressure receiving tank 6 is not damaged in the event of overpressure or vacuum, but also minimizes the evaporation and discharge of liquid inside the tank, reducing the pollution of the tank by the external environment.

[0040] In the above embodiment, multiple support brackets 65 are also fixedly installed on the wall of the shell 61, and a support base is provided at the bottom of the condensate receiving tank and is fixedly connected to the support brackets 65 through the support base. By providing a receiving tank with support brackets, it is convenient to use with the base, which facilitates the fixing of the receiving tank and the discharge of the cold medium liquid inside the tank.

[0041] In the above embodiment, the exhaust port 15 is arranged at the end near the refrigerant inlet 13.

[0042] In addition, the shell 61 of the atmospheric pressure receiving tank is cylindrical, and both the upper and lower ends of the shell 61 are round caps. The interior of the shell 61 is made of materials that are not corroded by the cold medium liquid, such as polytetrafluoroethylene, carbon fiber, copper oxide and stainless steel.

[0043] The working principle of the negative pressure self-weight discharge system of this utility model is as follows:

[0044] The condenser is tilted and fixedly mounted on the bracket. Its fraction inlet, refrigerant outlet, refrigerant inlet, and exhaust port are connected to the fractionation unit, refrigerant collection tank, refrigerant outlet tank, and vacuum pump, respectively. The vacuum pump is activated to extract air from the cooling channels of the condenser, creating a vacuum. The vacuum level is read using a vacuum gauge. Based on the density of the condensate obtained from vacuum distillation, the maximum liquid reflux height in the atmospheric leg pipe is calculated. An atmospheric leg pipe with a height higher than this maximum reflux height is then selected to connect the condensate outlet of the condenser to the atmospheric pressure receiving tank. The condensate inlet is connected to prevent liquid from overflowing from the atmospheric leg pipe. It also functions as a liquid seal to prevent gas from the atmospheric receiving tank from entering the cooling channel of the condenser. Therefore, through the above structure, the material to be de-lighted can continuously enter the fractionation unit, and the condensate produced can be automatically discharged through the vacuum condenser to achieve the balance of the entire system's inflow and outflow, and to achieve the purpose of stable and continuous discharge of condensate. Finally, the condensate is collected in the atmospheric receiving tank for storage, thus completing the condensation process of the distillate and the collection process of the condensate in the vacuum distillation process.

[0045] In summary, this negative pressure gravity discharge system requires less equipment, has lower costs, and saves energy. Through the atmospheric leg pipe and the liquid seal inside the pipe, the condensate in the cooling channel can be discharged stably and continuously, which is conducive to continuous production processes and provides convenient conditions for subsequent storage and further use of the condensate.

[0046] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0047] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A negative pressure gravity discharge system, characterized in that, include: Condenser bracket; A fractionation device (2) is provided, wherein the fraction outlet of the fractionation device (2) is connected to an output pipe (21); A condenser (1) is tubular and its two ends are inclined and fixed on the condenser support. The condenser (1) has a cooling channel and a refrigerant channel. One end of the cooling channel is a fraction inlet (11) and the other end is a condensate outlet (14). One end of the refrigerant channel is a refrigerant outlet (12) and a refrigerant inlet (13). The fraction inlet (11) corresponds to the high end of the condenser (1) and is connected to the output pipe (21). The condensate outlet (14) corresponds to the low end of the condenser (1). The refrigerant supply device (3) has its inlet and outlet connected to the refrigerant outlet (12) and the refrigerant inlet (13) via pipes to form a circulation path. The condenser (1) is provided with an exhaust port (15) that connects to the cooling channel. The exhaust port of the condenser (4) is connected to the exhaust port (15) through an exhaust pipe (41). Atmospheric leg tube (5), which is arranged vertically and horizontally and has one end connected to the condensate outlet (14); A condensate receiving tank (6) is located below the atmospheric leg pipe (5) and is sealed and connected.

2. The negative pressure gravity discharge system according to claim 1, characterized in that, The refrigerant supply device (3) includes: A refrigerant outlet tank (31) is provided, and a refrigerant outlet pipe (311) is connected to the outlet end of the refrigerant outlet tank (31), which is connected to the refrigerant inlet (13). A refrigerant collection tank (32) is provided, with a refrigerant recovery pipe (321) connected to the inlet end of the refrigerant collection tank (32). The refrigerant recovery pipe (321) is connected to the refrigerant outlet (12). The refrigerant collection tank (32) and the refrigerant outlet tank (31) are connected through a circulation pipe (33). Both the refrigerant collection tank (32) and the refrigerant outlet tank (31) are equipped with a refrigerator. A miniature water pump is installed in the circulation pipe (33).

3. The negative pressure gravity discharge system according to claim 1, characterized in that, The air extraction device (4) is a vacuum pump.

4. The negative pressure gravity discharge system according to claim 1, characterized in that, The condensate receiving tank (6) is an atmospheric pressure receiving tank, including a shell (61) and a breather valve (62). The shell (61) has a condensate inlet (63) at the top and a breather valve mounting hole near the condensate inlet (63). The bottom has a condensate discharge port (64). The condensate inlet (63) is sealed and connected to the upper end of the atmospheric leg pipe (5). The breather valve (62) is installed at the breather valve mounting hole.

5. The negative pressure gravity discharge system according to claim 4, characterized in that, Multiple support brackets (65) are also fixedly installed on the wall of the shell (61), and a support base is provided at the bottom of the condensate receiving tank (6) and is fixedly connected to the support brackets (65) through the support base.

6. The negative pressure gravity discharge system according to claim 1, characterized in that, The exhaust port (15) is located near the refrigerant inlet (13).

Images