Low-energy-consumption oxygen and nitrogen separation tower
By setting up a heat exchanger in the oxygen-nitrogen separation tower to recover the heat discharged from the sub-tower, the problem of high energy consumption of the existing oxygen-nitrogen separation tower is solved, and the effect of low energy consumption and high energy utilization is achieved.
Patent Information
- Application Number
- CN202421657570.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-12
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-07-12
AI Technical Summary
When the existing oxygen and nitrogen separation towers separate oxygen and nitrogen in the air, they cause a large amount of heat loss, low energy utilization rate, and high energy consumption.
A low-energy oxygen-to-nitrogen separation tower is designed. By setting up a heat exchanger, the oxygen-rich gas discharged from the nitrogen adsorption sub-tab and the heat in the exhaust gas discharged from the oxygen adsorption sub-tab is recycled and utilized, thereby improving the recovery and utilization rate of heat in the exhaust gas.
It effectively reduces energy consumption, improves energy utilization, reduces heat waste, and optimizes the heat exchange effect by adjusting the structure of the partition plate and snake tube in the heat exchanger.
Smart Images
Figure CN222765964U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an oxygen-nitrogen separation tower, in particular to a low-energy consumption oxygen-nitrogen separation tower. Background Art
[0002] The existing oxygen and nitrogen production system is mainly composed of a separator, an air compressor, an air purifier, an air dryer, a nitrogen-oxygen separation tower, a purification tank, an oxygen boosting system and a nitrogen boosting system. The oxygen-nitrogen separation tower mainly separates oxygen and nitrogen in the air by molecular sieve adsorption, and then produces the most commonly used oxygen and nitrogen for industrial gases. Since the air needs to be purified and heated and dried before entering the oxygen-nitrogen separation tower, the air entering the oxygen-nitrogen separation tower is hot air. After the nitrogen adsorption tower and the oxygen adsorption tower of the oxygen-nitrogen separation tower adsorb nitrogen and oxygen, they generally directly discharge the waste gas, resulting in a large amount of heat loss and low energy utilization. Therefore, the existing technology has the problem of high energy consumption. Utility Model Content
[0003] The purpose of the utility model is to provide a low-energy consumption oxygen-nitrogen separation tower. The utility model has the characteristic of effectively reducing energy consumption.
[0004] The technical solution of the utility model is as follows: a low-energy oxygen-nitrogen separation tower, comprising a nitrogen adsorption sub-tower and an oxygen adsorption sub-tower which are connected in sequence, wherein an oxygen-enriched gas discharge port and an air inlet are respectively arranged at the top and bottom of the nitrogen adsorption sub-tower, and a waste gas discharge port and an oxygen-enriched gas delivery port are respectively arranged at the top and bottom of the oxygen adsorption sub-tower; further comprising a heat exchanger, wherein a heat exchange air inlet and a heat exchange air outlet are respectively arranged at the left and right ends of the heat exchanger, a waste gas inlet and a waste gas outlet are respectively arranged at the upper and lower sides of the left half of the heat exchanger, and an oxygen-enriched gas inlet and an oxygen-enriched gas outlet are respectively arranged at the upper and lower sides of the right half of the heat exchanger; the waste gas inlet is connected to the waste gas discharge port via a pipeline, the oxygen-enriched gas inlet is connected to the oxygen-enriched gas discharge port via a pipeline, and the oxygen-enriched gas outlet is connected to the oxygen-enriched gas delivery port via a pipeline.
[0005] In the aforementioned low-energy oxygen-nitrogen separation tower, the heat exchanger includes a heat exchanger shell, and the left half of the heat exchanger shell is provided with a left vertical serpentine tube, the upper end of the left vertical serpentine tube is connected to the exhaust gas inlet, and the lower end is connected to the exhaust gas outlet; the right half of the heat exchanger shell is provided with a right vertical serpentine tube, the upper end of the right vertical serpentine tube is connected to the oxygen-rich gas inlet, and the lower end is connected to the oxygen-rich gas outlet; the middle part of the heat exchanger shell is also provided with an upper vertical partition and a lower vertical partition; the heat exchanger shell is provided with a heat exchange air inlet and a heat exchange air outlet at both ends.
[0006] In the aforementioned low-energy oxygen-nitrogen separation tower, a driving cylinder is provided on the bottom surface of the heat exchanger shell, a connecting rod is provided at the output end of the driving cylinder, and a lower vertical partition is provided at the end of the connecting rod.
[0007] Compared with the prior art, the utility model is used to recover the heat in the oxygen-rich gas discharged from the nitrogen adsorption tower and the waste gas discharged from the oxygen adsorption tower by setting a heat exchanger, thereby effectively improving the recovery rate of heat in the waste gas and reducing heat waste. In summary, the utility model has the characteristics of effectively reducing energy consumption.
[0008] In addition, the utility model realizes the recovery and utilization of heat in two gases in one heat exchanger by arranging an upper vertical partition and a lower vertical partition in the middle part of the heat exchanger shell, arranging a left vertical serpentine tube in the left half of the heat exchanger shell, and arranging a right vertical serpentine tube in the right half of the heat exchanger shell; and the lower vertical partition can adjust the distance between itself and the upper vertical partition according to actual needs to control the distance between the upper and lower vertical partitions, so as to control the size of the vent between the two, and then adjust the flow rate and residence time of the air in the left half. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 It is a structural schematic diagram of the utility model;
[0010] Figure 2 It is a structural view of the heat exchanger.
[0011] The markings in the accompanying drawings are: 1-nitrogen adsorption subtower, 2-oxygen adsorption subtower, 3-oxygen-rich gas discharge port, 4-air inlet, 5-waste gas discharge port, 6-oxygen-rich gas delivery port, 7-heat exchanger, 8-heat exchange air inlet, 9-heat exchange air outlet, 10-waste gas inlet, 11-waste gas outlet, 12-oxygen-rich gas inlet, 13-oxygen-rich gas outlet, 701-heat exchanger shell, 702-left vertical serpentine pipe, 703-right vertical serpentine pipe, 704-upper vertical partition, 705-lower vertical partition, 706-driving cylinder, 707-connecting rod. DETAILED DESCRIPTION
[0012] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.
[0013] Embodiment. A low energy consumption oxygen and nitrogen separation tower, comprising: Figure 1-2As shown, it includes a nitrogen adsorption subtower 1 and an oxygen adsorption subtower 2 which are connected in sequence, the top and bottom of the nitrogen adsorption subtower 1 are respectively provided with an oxygen-enriched gas discharge port 3 and an air inlet 4, and the top and bottom of the oxygen adsorption subtower 2 are respectively provided with a waste gas discharge port 5 and an oxygen-enriched gas supply port 6; it also includes a heat exchanger 7, the left and right ends of the heat exchanger 7 are respectively provided with a heat exchange air inlet 8 and a heat exchange air outlet 9, the upper and lower sides of the left half of the heat exchanger 7 are respectively provided with a waste gas inlet 10 and a waste gas outlet 11, and the upper and lower sides of the right half of the heat exchanger 7 are respectively provided with an oxygen-enriched gas inlet 12 and an oxygen-enriched gas outlet 13; the waste gas inlet 10 is connected to the waste gas discharge port 5 via a pipeline, the oxygen-enriched gas inlet 12 is connected to the oxygen-enriched gas discharge port 5 via a pipeline, and the oxygen-enriched gas outlet 13 is connected to the oxygen-enriched gas supply port 6 via a pipeline.
[0014] The heat exchanger 7 includes a heat exchanger shell 701, and the left half of the heat exchanger shell 701 is provided with a left vertical serpentine pipe 702, the upper end of the left vertical serpentine pipe 702 is connected to the exhaust gas inlet 10, and the lower end is connected to the exhaust gas outlet 11; the right half of the heat exchanger shell 701 is provided with a right vertical serpentine pipe 703, the upper end of the right vertical serpentine pipe 703 is connected to the oxygen-enriched gas inlet 12, and the lower end is connected to the oxygen-enriched gas outlet 13; the middle part of the heat exchanger shell 701 is also provided with an upper vertical partition 704 and a lower vertical partition 705; the heat exchanger shell 701 is provided with a heat exchange air inlet 8 and a heat exchange air outlet 9 at both ends.
[0015] A driving cylinder 706 is provided on the bottom surface of the heat exchanger shell 701 , a connecting rod 707 is provided at the output end of the driving cylinder 706 , and a lower vertical partition 705 is provided at the end of the connecting rod 707 .
[0016] A slide groove is arranged on the bottom surface of the heat exchanger shell, and a sliding block fixed to the lower vertical partition plate is arranged in the slide groove.
[0017] The side wall surface of the upper vertical partition is provided with a sealing groove, and the side wall surface of the lower vertical partition is provided with a corresponding sealing strip.
[0018] A gas passing notch is provided between the lower end of the upper vertical partition and the bottom surface of the heat exchanger shell, and a gas passing notch is provided between the upper end of the lower vertical partition and the top surface of the heat exchanger shell.
[0019] The air flow rate can be adjusted by adjusting the distance between the upper vertical partition and the lower vertical partition, and then the retention time can be adjusted, the heat exchange time can be changed, and the heat exchange effect can be ensured. The specific adjustment method is to drive the connecting rod to extend or contract by driving the cylinder, drive the lower vertical partition to move accordingly, and then change the distance between the two.
[0020] Because the cold air enters from the heat exchange air inlet on the left side of the heat exchanger and flows out from the heat exchange air outlet on the right side of the heat exchanger, and the heat in the exhaust gas is less than the heat in the oxygen-rich gas, the utility model uses the left vertical serpentine tube of the left half to exchange heat with the exhaust gas and absorb the heat in the exhaust gas; and uses the right vertical serpentine tube of the right half to exchange heat with the oxygen-rich gas and absorb the heat in the oxygen-rich gas, thereby effectively improving the heat recovery rate.
[0021] The heat exchange gas inlet is connected to the outlet of the air purifier, and the heat exchange gas outlet is connected to the inlet of the dryer, so that the purified gas can be preheated, the power consumption of the dryer can be reduced, the heat in the tail gas is fully utilized, and the energy utilization rate is improved.
[0022] The nitrogen adsorption tower and the oxygen adsorption tower are conventional structures, and the adsorption and emission of the corresponding gases are achieved by means of pressurized adsorption and reduced pressure desorption.
[0023] The specific heat exchange method of the utility model is as follows: the dried purified air enters from the air inlet of the nitrogen adsorption sub-tower, the nitrogen in the purified air is adsorbed, so that the oxygen-rich gas is discharged into the oxygen-rich gas inlet on the right side of the heat exchanger through the oxygen-rich gas discharge port, and after heat exchange with the undried purified air (secondary preheating), it flows back into the oxygen-rich gas delivery inlet of the oxygen adsorption tower, and the oxygen is adsorbed by the molecular sieve in the oxygen adsorption sub-tower, and the remaining gas is discharged from the exhaust gas discharge port to the exhaust gas inlet of the left half of the heat exchanger, enters the left vertical serpentine pipe, and flows out from the exhaust gas outlet, so as to preheat the undried gas once.
[0024] The nitrogen adsorption sub-tower and the oxygen adsorption sub-tower are also respectively provided with a nitrogen discharge port and an oxygen discharge port for discharging corresponding gases.
Claims
1. A low energy consumption oxygen and nitrogen separation tower, characterized in that: The invention comprises a nitrogen adsorption sub-tower (1) and an oxygen adsorption sub-tower (2) connected in sequence, wherein the nitrogen adsorption sub-tower (1) is provided with an oxygen-enriched gas discharge port (3) and an air inlet (4) at the top and bottom, respectively, and the oxygen adsorption sub-tower (2) is provided with an exhaust gas discharge port (5) and an oxygen-enriched gas supply port (6) at the top and bottom, respectively; and a heat exchanger (7) is further provided with a heat exchange air inlet (8) and a heat exchange air outlet (9) at the left and right ends, an exhaust gas inlet (10) and an exhaust gas outlet (11) at the upper and lower sides of the left half of the heat exchanger (7), and an oxygen-enriched gas inlet (12) and an oxygen-enriched gas outlet (13) at the upper and lower sides of the right half of the heat exchanger (7); the exhaust gas inlet (10) is connected to the exhaust gas discharge port (5) via a pipeline, the oxygen-enriched gas inlet (12) is connected to the oxygen-enriched gas discharge port (3) via a pipeline, and the oxygen-enriched gas outlet (13) is connected to the oxygen-enriched gas supply port (6) via a pipeline.
2. A low energy consumption oxygen and nitrogen separation tower according to claim 1, characterized in that: The heat exchanger (7) comprises a heat exchanger shell (701), wherein the left half of the heat exchanger shell (701) is provided with a left vertical serpentine tube (702), wherein the upper end of the left vertical serpentine tube (702) is connected to the exhaust gas inlet (10) and the lower end is connected to the exhaust gas outlet (11); the right half of the heat exchanger shell (701) is provided with a right vertical serpentine tube (703), wherein the upper end of the right vertical serpentine tube (703) is connected to the oxygen-enriched gas inlet (12) and the lower end is connected to the oxygen-enriched gas outlet (13); the middle part of the heat exchanger shell (701) is also provided with an upper vertical partition plate (704) and a lower vertical partition plate (705); and the heat exchange air inlet (8) and the heat exchange air outlet (9) are provided at both ends of the heat exchanger shell (701).
3. A low energy consumption oxygen and nitrogen separation tower according to claim 2, characterized in that: A driving cylinder (706) is provided on the bottom surface of the heat exchanger shell (701), a connecting rod (707) is provided at the output end of the driving cylinder (706), and a lower vertical partition (705) is provided at the end of the connecting rod (707).