Nitrogen-argon separation two-section plate-type rectifying tower

Abstract

The invention belongs to the technical field of rectifying towers, and particularly relates to a nitrogen-argon separation two-section plate-type rectifying tower which comprises a lower nitrogen-argon separation rectifying tower body, an upper nitrogen-argon separation rectifying tower body is fixedly connected to the upper surface of the lower nitrogen-argon separation rectifying tower body, and a filter is arranged on the left side of the lower nitrogen-argon separation rectifying tower body. The bottom end of the filter fixedly communicates with a first communicating pipe, the right end of the first communicating pipe fixedly communicates with an air compressor, the output end of the air compressor fixedly communicates with a second communicating pipe, the right end of the second communicating pipe fixedly communicates with a cooler, and the output end of the cooler fixedly communicates with an injection pipe. And the right end of the injection pipe penetrates through the lower nitrogen-argon separation rectifying tower and extends into the lower nitrogen-argon separation rectifying tower. According to the device, air can be fully utilized, more air can participate in rectification, the problem that part of gas is wasted by a bypass waste nitrogen channel after being expanded is solved, and the energy consumption during nitrogen and argon preparation and separation is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of distillation towers, in particular to a two-stage plate distillation tower for nitrogen and argon separation. Background Art

[0002] A distillation tower is a tower-type vapor-liquid contact device for distillation. There are two main types of distillation towers: plate towers and packed towers. The distillation tower utilizes the different volatilities of the components in the mixture, that is, the different vapor pressures of the components at the same temperature, to transfer the light components in the liquid phase to the gas phase, and the heavy components in the gas phase to the liquid phase, thereby achieving the purpose of separation. The distillation tower is also a mass transfer and heat transfer device that is extremely widely used in chemical production.

[0003] The application of distillation towers is particularly extensive. The preparation and separation of nitrogen and argon also require the use of distillation towers. However, the current distillation towers are difficult to fully utilize air when preparing and separating nitrogen and argon. During the preparation of nitrogen and argon, a portion of the gas will be directly wasted by the bypassed dirty nitrogen channel after expansion, and this portion of the gas cannot participate in distillation, thereby increasing the energy consumption during the preparation and separation of nitrogen and argon. For this reason, the present invention provides a two-stage plate distillation tower for nitrogen and argon separation. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a two-stage plate distillation tower for nitrogen and argon separation, which solves the problem that the current distillation tower is difficult to fully utilize air when preparing and separating nitrogen and argon. During the preparation of nitrogen and argon, a part of the gas will be directly wasted by the bypassed dirty nitrogen channel after expansion, and this part of the gas cannot participate in distillation, thereby increasing the energy consumption during the preparation and separation of nitrogen and argon.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a two-stage plate distillation tower for nitrogen-argon separation, comprising a lower nitrogen-argon separation distillation tower, the upper surface of the lower nitrogen-argon separation distillation tower is fixedly connected to an upper nitrogen-argon separation distillation tower, a filter is provided on the left side of the lower nitrogen-argon separation distillation tower, the bottom end of the filter is fixedly connected to a first connecting pipe, the right end of the first connecting pipe is fixedly connected to an air compressor, the output end of the air compressor is fixedly connected to a second connecting pipe, the right end of the second connecting pipe is fixedly connected to a cooler, the output end of the cooler is fixedly connected to an injection pipe, the right end of the injection pipe passes through the lower nitrogen-argon separation distillation tower and extends to the lower nitrogen-argon separation distillation tower. Inside the tower, a plurality of packing plates are fixedly installed on the inner wall of the lower nitrogen-argon separation distillation tower, two groups of tower plates are fixedly installed on the inner wall of the upper nitrogen-argon separation distillation tower, a discharge pipe is fixedly connected to the upper surface of the upper nitrogen-argon separation distillation tower, the bottom end of the discharge pipe is fixedly connected to an expansion air heat exchanger, the output end of the expansion air heat exchanger is fixedly connected to a discharge pipe, the left end of the discharge pipe passes through the upper nitrogen-argon separation distillation tower and extends to the interior of the upper nitrogen-argon separation distillation tower, a steam pipe is fixedly connected to the outer surface of the lower nitrogen-argon separation distillation tower, a first thermometer is fixedly connected to the outer surface of the steam pipe, and a heater is fixedly connected to one end of the steam pipe away from the lower nitrogen-argon separation distillation tower.

[0006] As a preferred technical solution of the present invention, a reboiler is provided outside the lower nitrogen-argon separation distillation tower, and an output end of the reboiler passes through the lower nitrogen-argon separation distillation tower and extends to the interior of the lower nitrogen-argon separation distillation tower.

[0007] As a preferred technical solution of the present invention, the output end of the reboiler is fixedly connected to a first pipeline, and the input end of the first pipeline is fixedly connected to a pump body.

[0008] As a preferred technical solution of the present invention, the input end of the pump body is fixedly connected with an input pipe, and the front end of the input pipe passes through the lower nitrogen-argon separation distillation tower and extends to the interior of the lower nitrogen-argon separation distillation tower.

[0009] As a preferred technical solution of the present invention, the upper surface of the upper nitrogen-argon separation distillation tower is fixedly connected to a first joint, and the outer surface of the lower nitrogen-argon separation distillation tower is fixedly connected to a second joint.

[0010] As a preferred technical solution of the present invention, the outer surface of the discharge pipe is fixedly connected to a collecting pipe, and the outer surface of the collecting pipe is fixedly connected to a one-way valve.

[0011] As a preferred technical solution of the present invention, an observation cover is fixedly embedded on the front of the lower nitrogen-argon separation distillation tower, and a sealing cover is fixedly installed on the front of the observation cover.

[0012] As a preferred technical solution of the present invention, the bottom end of the lower nitrogen-argon separation distillation tower is fixedly connected to a drain pipe, and the outer surface of the drain pipe is fixedly connected to a drain valve.

[0013] As a preferred technical solution of the present invention, a fixed plate is fixedly connected to the left side of the lower nitrogen-argon separation distillation tower, and the left side of the fixed plate is fixedly connected to the outer surface of the injection pipe.

[0014] As a preferred technical solution of the present invention, an expansion air flow meter is fixedly connected to the outer surface of the discharge pipe, and a second thermometer is fixedly connected to the outer surface of the exhaust pipe.

[0015] Compared with the prior art, the present invention provides a two-stage plate distillation tower for nitrogen and argon separation, which has the following beneficial effects:

[0016] 1. The nitrogen-argon separation two-stage plate distillation tower can expand the gas and enter the inside of the expansion air heat exchanger through the set discharge pipe and the expansion air heat exchanger, and cooperate with the discharge pipe. The gas will be heated and cooled by the expansion air heat exchanger, and can be injected into the upper nitrogen-argon separation distillation tower again to achieve the effect of distilling and utilizing it again, so that the air can be fully utilized, the superheat of the expanded air in the upper tower is reduced, the working condition of the distillation section is improved, more air can be involved in the distillation, and the problem of waste of the dirty nitrogen channel bypassed after part of the gas is expanded is solved, and the energy consumption during the preparation and separation of nitrogen and argon is reduced.

[0017] 2. The two-stage plate distillation tower for nitrogen and argon separation can filter and compress the air through the filter and air compressor, which is convenient for nitrogen and argon preparation and separation. The upper nitrogen and argon separation distillation tower and the tower plates provided in the lower nitrogen and argon separation distillation tower and the upper nitrogen and argon separation distillation tower, together with the heater, will respectively vaporize or liquefy the gases with different boiling points, thereby improving the preparation and separation speed of nitrogen and argon. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the front view of the present invention;

[0019] Figure 2 It is a three-dimensional structural schematic diagram of the rear view of the present invention;

[0020] Figure 3 It is a three-dimensional structural schematic diagram of a top view of the present invention;

[0021] Figure 4 A sectional view of the front view of the present invention;

[0022] Figure 5 It is a three-dimensional structural schematic diagram of the front view of the expansion air heat exchanger in the present invention.

[0023] In the figure: 1, lower nitrogen-argon separation distillation tower; 2, upper nitrogen-argon separation distillation tower; 3, filter; 4, first connecting pipe; 5, air compressor; 6, second connecting pipe; 7, cooler; 8, injection pipe; 9, heater; 10, steam pipe; 11, first thermometer; 12, discharge pipe; 13, expansion air heat exchanger; 14, expansion air flow meter; 15, discharge pipe; 16, second thermometer; 17, reboiler; 18, first pipeline; 19, pump body; 20, input pipe; 21, second joint; 22, first joint; 23, sealing cover; 24, fixing plate; 25, one-way valve; 26, collecting pipe; 27, tower plate; 28, packing plate; 29, drain pipe; 30, drain valve; 31, observation cover. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example

[0026] See also Figure 1-5 In this embodiment: a two-stage plate distillation tower for nitrogen and argon separation comprises a lower nitrogen and argon separation distillation tower 1, an upper nitrogen and argon separation distillation tower 2 is fixedly connected to the upper surface of the lower nitrogen and argon separation distillation tower 1, a filter 3 is arranged on the left side of the lower nitrogen and argon separation distillation tower 1, a first connecting pipe 4 is fixedly connected to the bottom end of the filter 3, an air compressor 5 is fixedly connected to the right end of the first connecting pipe 4, the air compressor 5 is also known as an air compressor, which is a machine for compressing air to increase gas pressure or transport gas, and the output end of the air compressor 5 A second connecting pipe 6 is fixedly connected, and a cooler 7 is fixedly connected to the right end of the second connecting pipe 6. The cooler 7 is a type of heat exchange equipment, which is used to cool the fluid, usually using water or air as a coolant to remove heat. It is widely used in large electrical equipment such as high-power silicon rectifiers, induction furnaces, and medium-frequency furnaces as a pure water, water-air, oil-water, and oil-air cooling devices for cooling and protecting auxiliary machines. The output end of the cooler 7 is fixedly connected to an injection pipe 8, and the right end of the injection pipe 8 passes through the lower nitrogen-argon separation distillation tower 1 and extends to the interior of the lower nitrogen-argon separation distillation tower 1.

[0027] A plurality of packing plates 28 are fixedly installed on the inner wall of the lower nitrogen-argon separation distillation tower 1, two groups of tower plates 27 are fixedly installed on the inner wall of the upper nitrogen-argon separation distillation tower 2, a discharge pipe 12 is fixedly connected to the upper surface of the upper nitrogen-argon separation distillation tower 2, the bottom end of the discharge pipe 12 is fixedly connected to the expansion air heat exchanger 13, the output end of the expansion air heat exchanger 13 is fixedly connected to the discharge pipe 15, the left end of the discharge pipe 15 passes through the upper nitrogen-argon separation distillation tower 2 and extends to the interior of the upper nitrogen-argon separation distillation tower 2, the outer surface of the lower nitrogen-argon separation distillation tower 1 is fixedly connected to the steam pipe 10, the outer surface of the steam pipe 10 is fixedly connected to the first thermometer 11, and the end of the steam pipe 10 away from the lower nitrogen-argon separation distillation tower 1 is fixedly connected to There is a heater 9, which is an energy conversion device. The energy input into the heater 9 is in the form of chemical energy in the fuel, electrical energy, thermal energy of high-temperature flue gas, etc., and after conversion by the heater 9, thermal energy with a certain temperature is output to the outside, thereby heating the air or other intermediary substances, thereby achieving the desired purpose. Through the setting of the filter 3 and the air compressor 5, the air will be filtered and compressed to facilitate the preparation and separation of nitrogen and argon. Through the packing plates 28 and tower plates 27 set in the lower nitrogen and argon separation distillation tower 1 and the upper nitrogen and argon separation distillation tower 2, and by using the setting of the heater 9, the gases with different boiling points will be vaporized or liquefied respectively, thereby accelerating the preparation and separation speed of nitrogen and argon.

[0028] In the present embodiment, a reboiler 17 is provided outside the lower nitrogen-argon separation distillation tower 1, and the output end of the reboiler 17 passes through the lower nitrogen-argon separation distillation tower 1 and extends to the interior of the lower nitrogen-argon separation distillation tower 1, and the output end of the reboiler 17 is fixedly connected to a first pipeline 18, and the input end of the first pipeline 18 is fixedly connected to a pump body 19, and the input end of the pump body 19 is fixedly connected to an input pipe 20, and the front end of the input pipe 20 passes through the lower nitrogen-argon separation distillation tower 1 and extends to the interior of the lower nitrogen-argon separation distillation tower 1. Through the reboiler 17, the first pipeline 18 and the input pipe 20, and in cooperation with the pump body 19, the liquid can be heated and will be flexibly recycled according to the distillation requirements.

[0029] In the present embodiment, the upper surface of the upper nitrogen-argon separation distillation tower 2 is fixedly connected with a first joint 22, the outer surface of the lower nitrogen-argon separation distillation tower 1 is fixedly connected with a second joint 21, the outer surface of the discharge pipe 15 is fixedly connected with a collecting pipe 26, the outer surface of the collecting pipe 26 is fixedly connected with a one-way valve 25, and the front of the lower nitrogen-argon separation distillation tower 1 is fixedly inlaid with an observation cover 31, and the front of the observation cover 31 is fixedly installed with a sealing cover 23. Through the first joint 22 and the second joint 21, the argon and oxygen after distillation separation can be discharged and collected, and the observation cover 31 and the sealing cover 23 are used to facilitate the internal inspection and maintenance of the distillation tower.

[0030] In this embodiment, the bottom end of the lower nitrogen-argon separation distillation tower 1 is fixedly connected with a drain pipe 29, and the outer surface of the drain pipe 29 is fixedly connected with a drain valve 30. The left side of the lower nitrogen-argon separation distillation tower 1 is fixedly connected with a fixed plate 24, and the left side of the fixed plate 24 is fixedly connected to the outer surface of the injection pipe 8. The outer surface of the discharge pipe 12 is fixedly connected with an expansion air flow meter 14, and the outer surface of the discharge pipe 15 is fixedly connected with a second thermometer 16. Through the arrangement of the drain pipe 29 and the drain valve 30, the separated liquid nitrogen can be discharged. By utilizing the arrangement of the fixed plate 24, the fixation of the injection pipe 8 is deepened, which will make the injection pipe 8 more secure. By utilizing the expansion air flow meter 14 and the second thermometer 16, the temperature and flow rate of the expanded air can be detected.

[0031] The working principle and use process of the present invention are as follows: first, the device is connected to a power source, then the air is filtered by a filter 3, and the filtered air is compressed by an air compressor 5, and then transported to the inside of a cooler 7 for cooling, so that the air can be cooled to form a liquid state, and then the air is input into the inside of a lower nitrogen-argon separation distillation tower 1 through an injection pipe 8, and then nitrogen and argon are prepared and separated, and then the heater 9 is started to work, so that steam can be injected into the inside of the lower nitrogen-argon separation distillation tower 1 through a steam pipe 10, so that the nitrogen can be gasified first when the liquid air boils;

[0032] Then, the packing plates 28 inside the lower nitrogen-argon separation distillation tower 1 and the plates 27 inside the upper nitrogen-argon separation distillation tower 2 will be used to vaporize or liquefy the gases with different boiling points respectively, and the expanded air generated after separation will be heat exchanged and cooled through the expanded air heat exchanger 13, and then discharged again to the interior of the lower nitrogen-argon separation distillation tower 1 for distillation separation, and finally the nitrogen and argon separated by distillation will be discharged through the drain pipe 29 and the second joint 21 respectively.

[0033] In the description of the present invention, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprising a reference structure" do not exclude the presence of other identical elements in the process, method, article or device comprising the elements. It should be noted that, in this article, relational terms such as "first", "second", etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0034] Finally, it should be noted that the above description is only 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 can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A two-stage nitrogen-argon separation plate distillation tower, comprising a lower nitrogen-argon separation distillation tower (1), characterized in that: The upper surface of the lower nitrogen-argon separation distillation tower (1) is fixedly connected to the upper nitrogen-argon separation distillation tower (2). A filter (3) is provided on the left side of the lower nitrogen-argon separation distillation tower (1). The bottom end of the filter (3) is fixedly connected to a first connecting pipe (4). The right end of the first connecting pipe (4) is fixedly connected to an air compressor (5). The output end of the air compressor (5) is fixedly connected to a second connecting pipe (6). The right end of the second connecting pipe (6) is fixedly connected to a cooler (7). The output end of the cooler (7) is fixedly connected to an injection pipe (8). The right end of the injection pipe (8) passes through the lower nitrogen-argon separation distillation tower (1) and extends to the interior of the lower nitrogen-argon separation distillation tower (1). The inner wall of the lower nitrogen-argon separation distillation tower (1) is fixedly installed with a plurality of filler plates (28). ), the inner wall of the upper nitrogen-argon separation distillation tower (2) is fixedly mounted with two groups of tower plates (27), the upper surface of the upper nitrogen-argon separation distillation tower (2) is fixedly connected with a discharge pipe (12), the bottom end of the discharge pipe (12) is fixedly connected with an expansion air heat exchanger (13), the output end of the expansion air heat exchanger (13) is fixedly connected with a discharge pipe (15), the left end of the discharge pipe (15) passes through the upper nitrogen-argon separation distillation tower (2) and extends to the interior of the upper nitrogen-argon separation distillation tower (2), the outer surface of the lower nitrogen-argon separation distillation tower (1) is fixedly connected with a steam pipe (10), the outer surface of the steam pipe (10) is fixedly connected with a first thermometer (11), and one end of the steam pipe (10) away from the lower nitrogen-argon separation distillation tower (1) is fixedly connected with a heater (9).

2. A two-stage plate distillation tower for nitrogen and argon separation according to claim 1, characterized in that: A reboiler (17) is provided outside the lower nitrogen-argon separation distillation tower (1), and an output end of the reboiler (17) passes through the lower nitrogen-argon separation distillation tower (1) and extends to the interior of the lower nitrogen-argon separation distillation tower (1).

3. A two-stage plate distillation tower for nitrogen and argon separation according to claim 2, characterized in that: The output end of the reboiler (17) is fixedly connected to a first pipeline (18), and the input end of the first pipeline (18) is fixedly connected to a pump body (19).

4. A two-stage plate distillation tower for nitrogen and argon separation according to claim 3, characterized in that: The input end of the pump body (19) is fixedly connected to an input pipe (20), and the front end of the input pipe (20) passes through the lower nitrogen-argon separation distillation tower (1) and extends to the interior of the lower nitrogen-argon separation distillation tower (1).

5. The two-stage plate distillation tower for nitrogen and argon separation according to claim 1, characterized in that: The upper surface of the upper nitrogen-argon separation distillation tower (2) is fixedly connected to a first joint (22), and the outer surface of the lower nitrogen-argon separation distillation tower (1) is fixedly connected to a second joint (21).

6. The two-stage plate distillation tower for nitrogen and argon separation according to claim 1, characterized in that: The outer surface of the discharge pipe (15) is fixedly connected to a collecting pipe (26), and the outer surface of the collecting pipe (26) is fixedly connected to a one-way valve (25).

7. The two-stage plate distillation tower for nitrogen and argon separation according to claim 1, characterized in that: An observation cover (31) is fixedly embedded on the front of the lower nitrogen-argon separation distillation tower (1), and a sealing cover (23) is fixedly installed on the front of the observation cover (31).

8. The two-stage plate distillation tower for nitrogen and argon separation according to claim 1, characterized in that: The bottom end of the lower nitrogen-argon separation distillation tower (1) is fixedly connected to a liquid discharge pipe (29), and the outer surface of the liquid discharge pipe (29) is fixedly connected to a liquid discharge valve (30).

9. The two-stage plate distillation tower for nitrogen and argon separation according to claim 1, characterized in that: A fixed plate (24) is fixedly connected to the left side surface of the lower nitrogen-argon separation distillation tower (1), and the left side surface of the fixed plate (24) is fixedly connected to the outer surface of the injection pipe (8).

10. The two-stage plate distillation tower for nitrogen and argon separation according to claim 1, characterized in that: The outer surface of the discharge pipe (12) is fixedly connected to an expansion air flow meter (14), and the outer surface of the exhaust pipe (15) is fixedly connected to a second thermometer (16).

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