Low-energy-consumption double-tower double-supercooling positive flow expansion nitrogen making device

Abstract

The utility model relates to the technical field of air separation, and discloses a low-energy-consumption double-tower double-supercooling positive flow expansion nitrogen-making device which comprises a purifier, a communicating pipeline is fixedly connected in the purifier, a waste gas pipeline is fixedly connected in the communicating pipeline, an air filter box is arranged on the outer wall of the waste gas pipeline, and the air filter box is fixedly connected with the purifier. A fixing plate is arranged on the upper surface of the air filtering box, a base is arranged on the upper surface of the fixing plate, a rotating column is fixedly connected to the interior of the base, an overturning plate is rotationally connected to the outer wall of the rotating column, and a threaded column is in threaded connection with the interior of the rotating column. According to the utility model, the overturning plate is pulled to rotate on the outer wall of the rotating column and drive the clamping block to slide out of the inner wall of the clamping plate, and at the moment, the clamping plate, the circular filter plate outer frame and the filter element can be taken out and replaced, so that the effect of quickly replacing the filter element is achieved, and waste gas generated in the nitrogen generation process can be treated; and the influence on the environment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of air separation, in particular to a low-energy consumption double-tower double-subcooling positive flow expansion nitrogen making device. Background Art

[0002] Nitrogen is an important industrial gas widely used in chemical, electronic, food and other industries. It plays an important role in many different fields. Nitrogen is widely used in industry for cooling, oxidation protection, gas inerting, atmosphere control and manufacturing chemicals. In some chemical reactions, nitrogen is often used as an inerting gas to remove oxygen from the reaction vessel or system to maintain the purity and safety of the reaction. In scientific experiments, nitrogen is often used as an inerting gas or cooling medium in the laboratory. Nitrogen is also used to make nitrides, such as compounds such as ammonia, nitric acid and urea. These compounds are widely used in agriculture, medicine and chemical industry. In general, nitrogen is a multifunctional gas that plays an important role in food preservation, industrial production, scientific experiments and many other fields.

[0003] In the traditional nitrogen production process, adsorption method, membrane separation method and other methods are often used, but there are problems such as high energy consumption, complex equipment and difficult operation. In order to solve this problem, it is now planned to carry out research on low-energy consumption double-tower double-subcooled positive flow expansion nitrogen production process to achieve energy consumption reduction and process simplification in the nitrogen production process. Utility Model Content

[0004] In order to make up for the above shortcomings, the utility model provides a low-energy consumption double-tower double-subcooled positive flow expansion nitrogen making device, which aims to improve the problem that the existing technology is not convenient to reduce the energy consumption of the nitrogen making process, simplify the equipment operation, improve the nitrogen making efficiency, and reduce the impact on the environment by optimizing the process flow and equipment structure.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A low-energy consumption double-tower double-subcooled positive flow expansion nitrogen making device comprises a purifier, wherein a communication pipe is fixedly connected inside the purifier, an exhaust gas pipe is fixedly connected inside the communication pipe, an air filter box is arranged on the outer wall of the exhaust gas pipe, a fixed plate is arranged on the upper surface of the air filter box, a base is arranged on the upper surface of the fixed plate, a rotating column is fixedly connected inside the base, a flip plate is rotatably connected to the outer wall of the rotating column, a threaded column is threadedly connected inside the rotating column, a rotating block is fixedly connected to the upper surface of the threaded column, a clamping block is fixedly connected to the lower surface of the flip plate, a clamping plate is slidably connected to the outer wall of the clamping block, and a filter assembly is arranged on the outer wall of the clamping plate.

[0007] Preferably, the filter assembly comprises a circular filter plate outer frame, the outer wall of the circular filter plate outer frame is fixedly connected to the outer wall of the clamping plate, and a filter core is arranged inside the circular filter plate outer frame.

[0008] Preferably, one end of the connecting pipe is fixedly connected to an air precooling unit, the interior of the air precooling unit is fixedly connected to a second-process pipe, and one end of the second-process pipe is fixedly connected to a centrifugal oil-free air compressor.

[0009] Preferably, the centrifugal oil-free air compressor is internally fixedly connected to a process pipeline, one end of which is fixedly connected to a self-cleaning air filter, and the purifier is internally fixedly connected to three process pipelines, one end of which is fixedly connected to a booster turbine expander.

[0010] Preferably, the booster turbine expander is fixedly connected to a first connecting pipe, one end of the first connecting pipe is fixedly connected to an upper distillation tower, the upper distillation tower is fixedly connected to a second connecting pipe, the upper distillation tower is fixedly connected to a third connecting pipe, one end of the third connecting pipe is fixedly connected to a condenser, and the condenser is fixedly connected to a first flow pipe.

[0011] Preferably, one end of the first flow pipe is fixedly connected to the interior of the upper distillation tower, the interior of the condenser is fixedly connected to a third flow pipe, one end of the third flow pipe is fixedly connected to the lower distillation tower, one end of the second connecting pipe is fixedly connected to the interior of the lower distillation tower, and the interior of the condenser is fixedly connected to a nitrogen exhaust pipe.

[0012] Preferably, one end of the nitrogen discharge pipe is fixedly connected to the interior of the lower distillation tower, a second flow pipe is fixedly connected to the interior of the lower distillation tower, one end of the second flow pipe is fixedly connected to the interior of the upper distillation tower, and the top of the upper distillation tower is fixedly connected to the nitrogen discharge pipe.

[0013] Preferably, the outer wall of the upper distillation tower is fixedly connected to a fixing frame, the inner wall of the fixing frame is fixedly connected to the outer wall of the condenser, and the inner wall of the fixing frame is fixedly connected to the outer wall of the lower distillation tower.

[0014] The utility model has the following beneficial effects:

[0015] 1. In the utility model, the flip plate is pulled to cause the flip plate to rotate on the outer wall of the rotating column and drive the card block to slide out from the inner wall of the card plate. At this time, the card plate together with the circular filter plate outer frame and the filter element can be taken out for replacement, thereby achieving the effect of quickly replacing the filter element, and then the waste gas generated in the nitrogen production process can be processed to reduce the impact on the environment.

[0016] 2. In the utility model, the gas enters the interior of the booster turbine expander through the three-process pipeline, the air entering the booster turbine expander enters the plate heat exchanger after being pressurized, and then is drawn from the middle of the plate heat exchanger to enter the expander for expansion, and the expanded air enters the interior of the upper distillation tower through the first connecting pipe, and the air is preliminarily distilled in the interior of the lower distillation tower to obtain liquid air and liquid nitrogen, and then enters the condenser through the third flow pipe and then enters the interior of the upper distillation tower through the first flow pipe, and liquid nitrogen is obtained at the bottom of the upper distillation tower after further distillation in the upper distillation tower, and pure liquid nitrogen is obtained at the top of the upper distillation tower and enters the next process through the nitrogen discharge pipe, thereby achieving a double-tower double-subcooled positive flow expansion nitrogen production process, and the effect of continuous nitrogen production is achieved through the alternating operation of the two towers.

[0017] 3. In the utility model, an air precooling unit is provided, air enters the precooling unit for cooling, the air temperature and water content are reduced, the burden of the purifier is reduced, and precooling is performed inside the air precooling unit. The precooled gas enters the interior of the purifier equipped with a molecular sieve through a connecting pipe for purification, which can ensure the purity of nitrogen and reduce energy consumption, thereby achieving precise control and optimization of the nitrogen production process and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional diagram of the low-energy consumption double-tower double-subcooled positive flow expansion nitrogen making device proposed by the utility model;

[0019] Figure 2 A schematic diagram of a filter element of a low-energy consumption double-tower double-subcooled positive flow expansion nitrogen production device proposed by the utility model;

[0020] Figure 3 A schematic diagram of a flip plate of a low-energy consumption double-tower double-subcooled positive flow expansion nitrogen production device proposed by the utility model;

[0021] Figure 4 A schematic diagram of a fixing frame of a low-energy consumption double-tower double-subcooled positive flow expansion nitrogen making device proposed in the utility model;

[0022] Figure 5 This is a schematic diagram of a condenser of a low-energy consumption double-tower double-subcooled positive flow expansion nitrogen production device proposed in the utility model.

[0023] Legend:

[0024] 1. Purifier; 2. Connecting pipeline; 3. Exhaust gas pipeline; 4. Air filter box; 5. Fixed plate; 6. Base; 7. Rotating column; 8. Flip plate; 9. Threaded column; 10. Rotating block; 11. Block; 12. Card; 13. Circular filter plate outer frame; 14. Filter element; 15. Self-cleaning air filter; 16. First process pipeline; 17. Centrifugal oil-free air compressor; 18. Second process pipeline; 19. Air precooling unit; 20. Third process pipeline; 21. Booster turbine expander; 22. First connecting pipe; 23. Upper distillation tower; 24. Second connecting pipe; 25. Third connecting pipe; 26. Condenser; 27. First flow pipe; 28. Lower distillation tower; 29. ​​Second flow pipe; 30. Third flow pipe; 31. Nitrogen exhaust pipe; 32. Fixed frame. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings of the specification of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Reference Figure 1 - Figure 3 The utility model provides an embodiment: a low-energy consumption double-tower double-subcooled positive flow expansion nitrogen making device, comprising a purifier 1, a connecting pipe 2 is fixedly connected inside the purifier 1, an exhaust pipe 3 is fixedly connected inside the connecting pipe 2, an air filter box 4 is arranged on the outer wall of the exhaust pipe 3, a fixing plate 5 is arranged on the upper surface of the air filter box 4, a base 6 is arranged on the upper surface of the fixing plate 5, a rotating column 7 is fixedly connected inside the base 6, a flip plate 8 is rotatably connected to the outer wall of the rotating column 7, a threaded column 9 is threadedly connected inside the rotating column 7, a rotating block 10 is fixedly connected to the upper surface of the threaded column 9, a clamping block 11 is fixedly connected to the lower surface of the flip plate 8, a clamping plate 12 is slidably connected to the outer wall of the clamping plate 12, and a filter assembly is arranged on the outer wall of the clamping plate 12;

[0027] Specifically, the exhaust gas generated by the purifier 1 enters the interior of the air filter box 4 through the connecting pipe 2 and then through the exhaust pipe 3. When the circular filter plate outer frame 13 and the filter plate 14 need to be replaced, it is only necessary to rotate the rotating block 10 to cause the threaded column 9 to rotate inside the base 6. When the rotating block 10 is rotated to allow the flip plate 8 to pass, the flip plate 8 is pushed to cause the flip plate 8 to rotate on the outer wall of the rotating column 7 and drive the card block 11 to slide out from the inner wall of the card plate 12.

[0028] Reference Figure 2 and Figure 3The filter assembly includes a circular filter plate outer frame 13, the outer wall of the circular filter plate outer frame 13 is fixedly connected to the outer wall of the clamping plate 12, and a filter element 14 is arranged inside the circular filter plate outer frame 13;

[0029] Specifically, the filter element 14 can be quickly replaced by taking out the clamping plate 12 together with the circular filter plate outer frame 13 and the filter element 14 for replacement.

[0030] Reference Figure 1 , Figure 4 and Figure 5 , one end of the connecting pipe 2 is fixedly connected to an air precooling unit 19, and a second process pipe 18 is fixedly connected inside the air precooling unit 19, and one end of the second process pipe 18 is fixedly connected to a centrifugal oil-free air compressor 17; the centrifugal oil-free air compressor 17 is fixedly connected to a first process pipe 16, and one end of the first process pipe 16 is fixedly connected to a self-cleaning air filter 15; the purifier 1 is fixedly connected to a third process pipe 20, and one end of the third process pipe 20 is fixedly connected to a booster turbine expander 21; the booster turbine expander 21 is fixedly connected to a first connecting pipe 22, and one end of the first connecting pipe 22 is fixedly connected to an upper distillation tower 23, and the upper distillation tower 23 is fixedly connected to a second connecting pipe 24, and the upper distillation tower 23 is fixedly connected to a third connecting pipe 25, and one end of the third connecting pipe 25 is fixedly connected to a condenser 26, and the condenser 2 6 is fixedly connected with a first flow pipe 27; one end of the first flow pipe 27 is fixedly connected to the interior of the upper distillation tower 23, a third flow pipe 30 is fixedly connected to the interior of the condenser 26, one end of the third flow pipe 30 is fixedly connected to the lower distillation tower 28, one end of the second connecting pipe 24 is fixedly connected to the interior of the lower distillation tower 28, and a nitrogen exhaust pipe 31 is fixedly connected to the interior of the condenser 26; one end of the nitrogen exhaust pipe 31 is fixedly connected to the interior of the lower distillation tower 28, a second flow pipe 29 is fixedly connected to the interior of the lower distillation tower 28, one end of the second flow pipe 29 is fixedly connected to the interior of the upper distillation tower 23, and the top of the upper distillation tower 23 is fixedly connected to the nitrogen exhaust pipe 31; the outer wall of the upper distillation tower 23 is fixedly connected to a fixing frame 32, the inner wall of the fixing frame 32 is fixedly connected to the outer wall of the condenser 26, and the inner wall of the fixing frame 32 is fixedly connected to the outer wall of the lower distillation tower 28;

[0031] Specifically, the filtered air enters the interior of the centrifugal oil-free air compressor 17 through the first process pipeline 16, and after being compressed by the centrifugal oil-free air compressor 17, enters the interior of the air precooling unit 19 through the second process pipeline 18, and is precooled in the interior of the air precooling unit 19. The precooled gas enters the interior of the purifier 1 equipped with a molecular sieve through the connecting pipeline 2 for purification. The air is successively adsorbed by the molecular sieve inside the absorber to remove water, hydrocarbons, and carbon dioxide. The gas enters the interior of the booster turbine expander 21 through the third process pipeline 20. The air entering the booster turbine expander 21 is pressurized and enters the plate heat exchanger, and then is extracted from the middle of the plate heat exchanger and enters the expander for expansion. The expanded air passes through the first connecting pipe 22 After entering the interior of the upper distillation tower 23, the air is preliminarily distilled in the interior of the lower distillation tower 28 to obtain liquid air and liquid nitrogen. The air enters the condenser 26 through the third flow pipe 30 and then enters the interior of the upper distillation tower 23 through the first flow pipe 27. After further distillation in the upper distillation tower 23, liquid nitrogen is obtained at the bottom of the upper distillation tower 23. Pure liquid nitrogen is obtained at the upper part of the upper distillation tower 23 and enters the next process through the nitrogen discharge pipe 31. An air precooling unit 19 is set. The air enters the air precooling unit 19 for cooling, thereby reducing the air temperature and water content, reducing the burden on the purifier 1, and is precooled in the air precooling unit 19. After precooling, the air enters the interior of the purifier 1 equipped with a molecular sieve through the connecting pipe 2 for purification, which can ensure the purity of the nitrogen and reduce energy consumption.

[0032] Working principle: When the device needs to be used, the exhaust gas generated by the purifier 1 enters the interior of the air filter box 4 through the connecting pipe 2 and then through the exhaust pipe 3. When the circular filter plate outer frame 13 and the filter plate 14 need to be replaced, it is only necessary to rotate the rotating block 10 to cause the threaded column 9 to rotate inside the base 6. When the rotating block 10 rotates to allow the flip plate 8 to pass, the flip plate 8 is pulled to cause the flip plate 8 to rotate on the outer wall of the rotating column 7 and drive the card block 11 to slide out from the inner wall of the card plate 12. At this time, the card plate 12 can be taken out together with the circular filter plate outer frame 13 and the filter element 14 for replacement, so as to achieve the effect of quickly replacing the filter element, and then the exhaust gas generated in the nitrogen production process can be treated to reduce the impact on the environment. The air passes through the purifier 1 to remove dust and other mechanical impurities. The filtered air passes through the first process pipeline 16 into the interior of the centrifugal oil-free air compressor 17. After entering the centrifugal oil-free air compressor 17 for compression, it passes through the second process pipeline 18 into the interior of the air precooling unit 19. The air is precooled in the air precooling unit 19. The precooled gas passes through the connecting pipeline 2 into the interior of the purifier 1 equipped with a molecular sieve for purification. The air is successively absorbed by the molecular sieve inside the absorber to remove water, hydrocarbons, and carbon dioxide. The gas passes through the third process pipeline 20 into the interior of the booster turbine expander 21. The air entering the booster turbine expander 21 is pressurized and then enters the plate heat exchanger. Then, the plate heat exchanger is used to heat the air. The air is extracted from the middle part and enters the expander for expansion. The expanded air enters the interior of the upper distillation tower 23 through the first connecting pipe 22. After the air is preliminarily distilled in the interior of the lower distillation tower 28, liquid air and liquid nitrogen are obtained. The air enters the condenser 26 through the third flow pipe 30 and then enters the interior of the upper distillation tower 23 through the first flow pipe 27. After further distillation in the upper distillation tower 23, liquid nitrogen is obtained at the bottom of the upper distillation tower 23. Pure liquid nitrogen is obtained at the top of the upper distillation tower 23 and enters the next process through the nitrogen discharge pipe 31, thereby achieving a double-tower double-subcooled positive flow expansion nitrogen production process. The effect of continuous nitrogen production is achieved through the alternating operation of the two towers. By setting an air precooling unit 19, the air enters the air precooling unit 19 for cooling to reduce the air temperature degree and water content, reducing the burden on the purifier 1, precooling is performed inside the air precooling unit 19, and the precooled gas enters the interior of the purifier 1 equipped with a molecular sieve through the connecting pipe 2 for purification, which can ensure the purity of the nitrogen and reduce energy consumption, thereby achieving the effect of accurately controlling and optimizing the nitrogen production process and reducing energy consumption. The device can not only achieve the effect of quickly replacing the filter element 14, but also process the exhaust gas generated in the nitrogen production process to reduce the impact on the environment. In addition, a double-tower double-subcooled positive flow expansion nitrogen production process can be achieved. By alternating the two towers, the effect of continuous nitrogen production can be achieved, and further, the effect of accurately controlling and optimizing the nitrogen production process and reducing energy consumption can be achieved.

[0033] Finally, it should be noted that the above 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 make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A low energy consumption double tower double subcooled positive flow expansion nitrogen production device, comprising a purifier (1), characterized in that: The purifier (1) is fixedly connected to a connecting pipe (2) inside, the connecting pipe (2) is fixedly connected to an exhaust pipe (3) inside, an air filter box (4) is arranged on the outer wall of the exhaust pipe (3), a fixing plate (5) is arranged on the upper surface of the air filter box (4), a base (6) is arranged on the upper surface of the fixing plate (5), a rotating column (7) is fixedly connected inside the base (6), a flip plate (8) is rotatably connected to the outer wall of the rotating column (7), a threaded column (9) is threadedly connected inside the rotating column (7), a rotating block (10) is fixedly connected to the upper surface of the threaded column (9), a clamping block (11) is fixedly connected to the lower surface of the flip plate (8), a clamping plate (12) is slidably connected to the outer wall of the clamping block (11), and a filter assembly is arranged on the outer wall of the clamping plate (12).

2. The low energy consumption double-tower double-subcooled forward flow expansion nitrogen production device according to claim 1 is characterized in that: The filter assembly comprises a circular filter plate outer frame (13), the outer wall of the circular filter plate outer frame (13) being fixedly connected to the outer wall of the clamping plate (12), and a filter core (14) being arranged inside the circular filter plate outer frame (13).

3. The low energy consumption double-tower double-subcooled forward flow expansion nitrogen production device according to claim 2 is characterized in that: One end of the connecting pipe (2) is fixedly connected to an air precooling unit (19), the interior of the air precooling unit (19) is fixedly connected to a second process pipe (18), and one end of the second process pipe (18) is fixedly connected to a centrifugal oil-free air compressor (17).

4. The low energy consumption double-tower double-subcooled forward flow expansion nitrogen production device according to claim 3 is characterized in that: The centrifugal oil-free air compressor (17) is internally fixedly connected to a process pipeline (16), one end of which is fixedly connected to a self-cleaning air filter (15), and the purifier (1) is internally fixedly connected to a three-process pipeline (20), one end of which is fixedly connected to a booster turbine expander (21).

5. The low energy consumption double-tower double-subcooled forward flow expansion nitrogen production device according to claim 4 is characterized in that: The booster turbine expander (21) is fixedly connected to a first connecting pipe (22) at one end thereof and an upper distillation tower (23) at the other end thereof; the upper distillation tower (23) is fixedly connected to a second connecting pipe (24) at the other end thereof; the upper distillation tower (23) is fixedly connected to a third connecting pipe (25) at the other end thereof and a condenser (26) at the other end thereof; and the condenser (26) is fixedly connected to a first flow pipe (27) at the other end thereof.

6. The low energy consumption double-tower double-subcooled forward flow expansion nitrogen production device according to claim 5 is characterized in that: One end of the first flow pipe (27) is fixedly connected to the interior of the upper distillation tower (23); the interior of the condenser (26) is fixedly connected to a third flow pipe (30); one end of the third flow pipe (30) is fixedly connected to a lower distillation tower (28); one end of the second connecting pipe (24) is fixedly connected to the interior of the lower distillation tower (28); and the interior of the condenser (26) is fixedly connected to a nitrogen exhaust pipe (31).

7. The low energy consumption double-tower double-subcooled forward flow expansion nitrogen production device according to claim 6 is characterized in that: One end of the nitrogen discharge pipe (31) is fixedly connected to the interior of the lower distillation tower (28), a second flow pipe (29) is fixedly connected to the interior of the lower distillation tower (28), one end of the second flow pipe (29) is fixedly connected to the interior of the upper distillation tower (23), and the top end of the upper distillation tower (23) is fixedly connected to the nitrogen discharge pipe (31).

8. The low energy consumption double-tower double-subcooled forward flow expansion nitrogen production device according to claim 7 is characterized in that: The outer wall of the upper distillation tower (23) is fixedly connected to a fixing frame (32), the inner wall of the fixing frame (32) is fixedly connected to the outer wall of the condenser (26), and the inner wall of the fixing frame (32) is fixedly connected to the outer wall of the lower distillation tower (28).

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