Auxiliary starting device of fractionating tower

Abstract

The utility model provides an auxiliary starting device of a fractionating tower, which belongs to the technical field of fractionating towers and comprises a fractionating tower, a liquid level sensor, a liquid oxygen storage tank and a controller, the fractionating tower comprises an upper tower, a condensing evaporator and a lower tower which are sequentially arranged from top to bottom; an air inlet is formed in the lower end of the lower tower, and a first outlet is formed in the bottom of the lower tower and communicated with the upper end of the upper tower; a nitrogen channel and a liquid oxygen containing cavity exchanging heat with the nitrogen channel are arranged in the condensation evaporator, and the top of the liquid oxygen containing cavity is communicated with the bottom of the upper tower; the detection end of the liquid level sensor extends into the liquid oxygen containing cavity; a first pipeline is arranged at the outflow end of the liquid oxygen storage tank and is communicated with the liquid oxygen containing cavity; a first control valve is arranged on the first pipeline; the controller is respectively connected with the first control valve and the liquid level sensor; and when the liquid level in the liquid oxygen containing cavity is higher than a preset value, the controller controls the first control valve to be closed. The auxiliary starting device for the fractionating tower can shorten the starting time of the fractionating tower and improve the starting efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of fractionation towers, and more specifically relates to an auxiliary starting device for a fractionation tower. Background Art

[0002] In the metallurgical steelmaking industry, air separation equipment is often used to produce oxygen and nitrogen of different purities required for smelting. Specifically, the dehumidified and purified air is often passed through a main heat exchanger for preliminary heat exchange, and the initially cooled air after heat exchange is then introduced into a distillation tower for separation to obtain oxygen and nitrogen of different purities.

[0003] In the prior art, an upper tower and a lower tower are provided inside the fractionation tower, and the upper tower and the lower tower are connected through a condenser evaporator. The oxygen-rich liquid air initially separated by the lower tower is rectified by the upper tower to form 80% low-purity liquid oxygen. The 80% low-purity liquid oxygen needs to enter the condenser evaporator to perform heat exchange with the nitrogen at the top of the lower tower so as to purify the liquid nitrogen by distillation. However, when the fractionation tower is initially started, the low-purity liquid oxygen content in the condenser evaporator needs to be gradually accumulated to a preset liquid level height before the heat exchange process with the nitrogen can be realized. Therefore, the slow increase of the liquid oxygen level causes the fractionation tower to start slowly and the startup efficiency is low, resulting in a high overall production time cost. Utility Model Content

[0004] The utility model aims to provide a fractionation tower auxiliary startup device, aiming to solve the technical problems in the prior art of slow fractionation tower startup, low startup efficiency and high production time cost.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a fractionation tower auxiliary startup device, comprising:

[0006] The fractionation tower comprises an upper tower, a condenser evaporator and a lower tower which are arranged in sequence from top to bottom; an air inlet is arranged at the lower end of the lower tower, a first outlet is arranged at the bottom of the lower tower, and the first outlet is communicated with the upper end of the upper tower; a nitrogen channel is arranged in the condenser evaporator, one end of the nitrogen channel is communicated with the top of the lower tower, and the other end is a liquid nitrogen outlet, and the liquid nitrogen outlet is communicated with the upper tower; a liquid oxygen chamber for heat exchange with the nitrogen chamber is arranged in the condenser evaporator, and the top of the liquid oxygen chamber is communicated with the bottom of the upper tower;

[0007] A liquid level sensor is arranged on the condenser evaporator, and a detection end thereof extends into the liquid oxygen chamber;

[0008] A liquid oxygen storage tank, wherein the outlet end is provided with a first pipeline, the first pipeline is connected to the liquid oxygen chamber; a first control valve is provided on the first pipeline; wherein after the temperature in the fractionation tower reaches a preset temperature value, the liquid oxygen storage tank is used to introduce liquid oxygen into the liquid oxygen chamber; and

[0009] A controller is connected to the first control valve and the liquid level sensor respectively; wherein when the liquid level in the liquid oxygen chamber is higher than a preset value, the controller controls the first control valve to close.

[0010] In a possible implementation, the distillation tower auxiliary startup device also includes a buffer storage tank, which is connected to the lower end of the liquid oxygen chamber through a second pipeline, and a second control valve is provided on the second pipeline, and the second control valve is connected to the controller.

[0011] In some embodiments, the buffer storage tank is also connected to the first pipeline through a third pipeline, and a third control valve is provided on the third pipeline, and the third control valve is connected to the controller.

[0012] Exemplarily, a first one-way valve is provided on the first pipeline, and the first one-way valve is located between the connecting end of the third pipeline and the outflow end of the liquid oxygen storage tank.

[0013] In some embodiments, a first exhaust pipe is provided on the top of the buffer storage tank, and the first exhaust pipe is connected to the air inlet; a first exhaust valve is provided on the first exhaust pipe.

[0014] In a possible implementation, the upper tower is further provided with a nitrogen outlet, a dirty nitrogen outlet and a first oxygen outlet arranged in sequence from top to bottom; the fractionation tower auxiliary startup device further includes:

[0015] A main heat exchanger is provided with an air outlet; the main heat exchanger is also provided with a first oxygen inlet connected to the first oxygen outlet, a nitrogen inlet connected to the nitrogen outlet, a dirty nitrogen inlet connected to the dirty nitrogen outlet, and a second oxygen inlet;

[0016] The liquid oxygen evaporator is provided with an air channel and a liquid oxygen channel inside, the inlet end of the air channel is connected to the air outlet, and the outlet end is connected to the air inlet; the inlet end of the liquid oxygen channel is connected to the liquid oxygen chamber, and the outlet end is connected to the second oxygen inlet.

[0017] In some embodiments, the inlet end of the liquid oxygen channel is also connected to the outlet end of the liquid oxygen storage tank through a fourth pipeline, a fourth control valve is provided on the fourth pipeline, and the fourth control valve is connected to the controller.

[0018] Exemplarily, a liquid return pipe is further provided on the pipeline connecting the outflow end of the liquid oxygen channel with the second oxygen inlet.

[0019] In a possible implementation, a second exhaust pipe is provided on the top of the liquid oxygen storage tank, the second exhaust pipe is communicated with the air inlet, and a second exhaust valve is provided on the second exhaust pipe.

[0020] In some embodiments, the liquid nitrogen outlet is also connected to the top of the lower tower through a liquid nitrogen reflux pipe.

[0021] Compared with the prior art, the solution shown in the embodiment of the present application can transport the liquid oxygen in the liquid oxygen storage tank to the condenser evaporator of the distillation tower through the first control valve and the first pipeline when the distillation tower is started, so that the liquid oxygen content in the liquid oxygen chamber quickly reaches a preset value, which is convenient for heat exchange between the liquid oxygen and the nitrogen in the nitrogen channel, and can shorten the start-up time of the distillation tower and improve the start-up efficiency; and the liquid level height of the liquid oxygen in the liquid oxygen chamber is monitored by a liquid level sensor to determine whether the liquid oxygen height reaches the preset value, so that the controller can control the opening and closing of the first control valve according to the liquid level information collected by the liquid level sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic structural diagram of a distillation tower auxiliary startup device provided in an embodiment of the utility model.

[0024] In the figure:

[0025] 1. Upper tower; 11. Nitrogen outlet; 12. Dirty nitrogen outlet; 13. First oxygen outlet;

[0026] 2. Lower tower; 21. Air inlet; 22. First outlet;

[0027] 3. Condenser evaporator; 31. Liquid nitrogen outlet; 32. Liquid nitrogen reflux pipe;

[0028] 4. Main heat exchanger; 41. Air outlet; 42. Nitrogen inlet; 43. Dirty nitrogen inlet; 44. First oxygen inlet; 45. Second oxygen inlet;

[0029] 5. Liquid level sensor;

[0030] 6. Liquid oxygen storage tank; 61. First pipeline; 611. First control valve; 612. First check valve; 62. Second exhaust pipe; 621. Second exhaust valve;

[0031] 7. Buffer storage tank; 71. Second pipeline; 711. Second control valve; 72. Third pipeline; 721. Third control valve; 73. First exhaust pipe; 731. First exhaust valve;

[0032] 8. Liquid oxygen evaporator; 81. Fourth pipeline; 811. Fourth control valve; 82. Liquid return pipe. DETAILED DESCRIPTION

[0033] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or indirectly on the other element. It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0036] See also Figure 1, the auxiliary start-up device for the distillation tower provided by the utility model is now described. The auxiliary start-up device for the distillation tower includes a distillation tower, a liquid level sensor 5, a liquid oxygen storage tank 6 and a controller; the distillation tower includes an upper tower 1, a condenser evaporator 3 and a lower tower 2 arranged in sequence from top to bottom; an air inlet 21 is provided at the lower end of the lower tower 2, and a first outlet 22 is provided at the bottom of the lower tower 2, and the first outlet 22 is connected to the upper end of the upper tower 1; a nitrogen channel is provided in the condenser evaporator 3, one end of the nitrogen channel is connected to the top of the lower tower 2, and the other end is a liquid nitrogen outlet 31, and the liquid nitrogen outlet 31 is connected to the upper tower 1; a liquid oxygen chamber for heat exchange with the nitrogen channel is provided in the condenser evaporator 3, and the liquid oxygen The top of the cavity is connected with the bottom of the upper tower 1; the liquid level sensor 5 is arranged on the condenser evaporator 3, and the detection end extends into the liquid oxygen cavity; the outflow end of the liquid oxygen storage tank 6 is provided with a first pipeline 61, and the first pipeline 61 is connected with the liquid oxygen cavity; the first pipeline 61 is provided with a first control valve 611; wherein, after the temperature in the distillation tower reaches a preset temperature value, the liquid oxygen storage tank 6 is used to introduce liquid oxygen into the liquid oxygen cavity; the controller is connected to the first control valve 611 and the liquid level sensor 5 respectively; wherein, when the liquid level in the liquid oxygen cavity is higher than the preset value, the controller controls the first control valve 611 to close.

[0037] It should be noted that the specific structures of the upper tower 1, the lower tower 2 and the condenser evaporator 3 in the fractionation tower are prior art, and heat exchange can be carried out between the liquid oxygen and the nitrogen in the condenser evaporator 3. The gas entering from the air inlet 21 is separated in the lower tower 2 to form oxygen-rich liquid air, and the oxygen-rich liquid air can only form liquid oxygen after distillation by the upper tower 1 and enter the liquid oxygen chamber of the condenser evaporator 3, so the accumulation speed of liquid oxygen is relatively slow; however, in the present application, after a certain amount of liquid oxygen is introduced into the liquid oxygen chamber in the condenser evaporator 3 through the liquid oxygen storage tank 6, the liquid oxygen level in the liquid oxygen chamber can quickly reach the normal operating height of the fractionation tower, that is, the preset value, therefore, the accumulation time of liquid oxygen can be reduced, and the startup time of the fractionation tower can be effectively shortened.

[0038] It should be noted that the controller is a structure in which multiple control elements are integrated together, and each element can be controlled separately through a control program. Specifically, the processing of the liquid level information collected by the liquid level sensor 5 and the opening and closing control of the first control valve 611 can be controlled separately through each control element, and the control principle of the controller and the specific structure of each control element belong to the prior art.

[0039] It should be understood that a temperature sensor is provided in the distillation tower for real-time monitoring of the temperature in the distillation tower, and after the temperature in the distillation tower reaches a preset temperature value, that is, after the temperature in the distillation tower reaches -173°C, oxygen-rich liquid air begins to appear in the lower tower 2. At this time, liquid oxygen can be transported to the liquid oxygen chamber through the liquid oxygen storage tank 6 to make the liquid level in the liquid oxygen chamber quickly reach the preset value.

[0040] Compared with the prior art, the auxiliary starting device for a distillation tower provided by the utility model can, when the distillation tower is started, transport the liquid oxygen in the liquid oxygen storage tank 6 to the condenser evaporator 3 of the distillation tower through the first control valve 611 and the first pipeline 61, so that the liquid oxygen content in the liquid oxygen storage chamber quickly reaches a preset value, which is convenient for heat exchange between the liquid oxygen and the nitrogen in the nitrogen channel, and can shorten the starting time of the distillation tower and improve the starting efficiency; and monitor the liquid level height of the liquid oxygen in the liquid oxygen storage chamber through the liquid level sensor 5 to determine whether the liquid oxygen height reaches the preset value, so that the controller can control the opening and closing of the first control valve 611 according to the liquid level information collected by the liquid level sensor 5.

[0041] See also Figure 1 In some possible embodiments, the distillation tower auxiliary startup device also includes a buffer storage tank 7, which is connected to the lower end of the liquid oxygen chamber through a second pipeline 71. The second pipeline 71 is provided with a second control valve 711, and the second control valve 711 is connected to the controller.

[0042] By providing a buffer storage tank 7, when the liquid level in the liquid oxygen chamber is higher than a preset range, the liquid oxygen in the liquid oxygen chamber is led out through the second pipeline 71 and transported to the buffer storage tank 7 for temporary storage. By providing a second control valve 711, it is convenient to control the on-off of the second pipeline 71.

[0043] Specifically, the liquid level sensor 5 transmits the liquid level information in the liquid oxygen chamber to the controller. When the liquid level in the liquid oxygen chamber is higher than a preset range, the controller controls the second control valve 711 to open to output excess liquid oxygen to the buffer storage tank 7.

[0044] See also Figure 1 In some embodiments, the buffer storage tank 7 is also connected to the first pipeline 61 through a third pipeline 72, and a third control valve 721 is provided on the third pipeline 72, and the third control valve 721 is connected to the controller.

[0045] The third pipeline 72 is provided so as to reversely transport the excess liquid oxygen stored in the buffer storage tank 7 to the liquid oxygen storage chamber. Specifically, the liquid level sensor 5 transmits the liquid level information in the liquid oxygen storage chamber to the controller. When the liquid level in the liquid oxygen storage chamber is lower than a preset value, the controller controls the third control valve 721 and the first control valve 611 to open so as to transport the liquid oxygen to the liquid oxygen storage chamber.

[0046] See also Figure 1 Exemplarily, a first one-way valve 612 is provided on the first pipeline 61 , and the first one-way valve 612 is located between the connecting end of the third pipeline 72 and the outflow end of the liquid oxygen storage tank 6 .

[0047] The first one-way valve 612 is provided to ensure that the liquid oxygen on the first pipeline 61 always flows from the liquid oxygen storage tank 6 to the distillation tower, thereby preventing the liquid oxygen in the liquid oxygen chamber from flowing back into the liquid oxygen storage tank 6.

[0048] It should be understood that the purity of the liquid oxygen in the liquid oxygen chamber is not the same as the purity of the liquid oxygen in the liquid oxygen storage tank 6. When the two are mixed, although it does not affect the heat exchange with the nitrogen channel, if the mixed liquid oxygen is reversely refluxed into the liquid oxygen storage tank 6, it is easy to affect the purity of the liquid oxygen in the liquid oxygen storage tank 6. Therefore, when the liquid oxygen level in the liquid oxygen chamber is higher than the preset range, it can be introduced into the buffer storage tank 7 for storage.

[0049] See also Figure 1 In some embodiments, a first exhaust pipe 73 is provided on the top of the buffer storage tank 7 , and the first exhaust pipe 73 is connected to the air inlet 21 ; a first exhaust valve 731 is provided on the first exhaust pipe 73 .

[0050] After being placed for a period of time, the liquid oxygen in the buffer storage tank 7 will be partially gasified into oxygen. Therefore, in order to avoid the problem of excessive gas pressure in the buffer storage tank 7 causing a potential safety hazard of the buffer storage tank 7, the oxygen can be discharged through the first exhaust pipe 73. The first exhaust valve 731 is used to control the on-off of the airflow on the first exhaust pipe 73. Specifically, the first exhaust valve 731 can be opened and closed at a fixed time so as to exhaust the buffer storage tank 7 regularly.

[0051] Optionally, a first pressure sensor is provided on the buffer tank 7 to monitor the pressure inside the buffer tank 7 in real time; the first exhaust valve 731 is set as an electric control valve, and the first pressure sensor and the electric control valve are electrically connected to the controller, so that when the pressure inside the buffer tank 7 exceeds a preset range, the controller controls the electric control valve to open to perform exhaust operations.

[0052] See also Figure 1 In some possible embodiments, the upper tower 1 is further provided with a nitrogen outlet 11, a dirty nitrogen outlet 12 and a first oxygen outlet 13 arranged in sequence from top to bottom; the fractionation tower auxiliary startup device also includes a main heat exchanger 4 and a liquid oxygen evaporator 8; the main heat exchanger 4 is provided with an air outlet 41; the main heat exchanger 4 is further provided with a first oxygen inlet 44 connected to the first oxygen outlet 13, a nitrogen inlet 42 connected to the nitrogen outlet 11, and a dirty nitrogen inlet 43 connected to the dirty nitrogen outlet 12, and a second oxygen inlet 45; an air channel and a liquid oxygen channel are provided inside the liquid oxygen evaporator 8, the inlet end of the air channel is connected to the air outlet 41, and the outlet end is connected to the air inlet 21; the inlet end of the liquid oxygen channel is connected to the liquid oxygen chamber, and the outlet end is connected to the second oxygen inlet 45.

[0053] The main heat exchanger 4 is used to provide dried primary cold air to the distillation tower through the liquid oxygen evaporator 8, and to transport the oxygen product and nitrogen product generated after distillation in the distillation tower to the next process node.

[0054] Specifically, the oxygen product includes two types, one is a first oxygen product formed after distillation in the upper tower 1 and heat exchange in the main heat exchanger 4, and the other is a second oxygen product formed after heat exchange with dry air at the liquid oxygen evaporator 8 and heat exchange in the main heat exchanger 4; the nitrogen product includes a nitrogen product and a dirty nitrogen product formed after distillation in the upper tower 1 of the distillation tower and heat exchange in the main heat exchanger 4.

[0055] See also Figure 1 In some embodiments, the inlet end of the liquid oxygen channel is also connected to the outlet end of the liquid oxygen storage tank 6 through a fourth pipeline 81, and a fourth control valve 811 is provided on the fourth pipeline 81, and the fourth control valve 811 is connected to the controller.

[0056] The fourth pipeline 81 is provided so as to transport the liquid oxygen in the liquid oxygen storage tank 6 to the oxygen channel of the liquid oxygen evaporator 8 to ensure the liquid oxygen content in the liquid oxygen channel, thereby ensuring that when the distillation tower is started, the liquid oxygen content in the liquid oxygen evaporator 8 can enter the working state normally; the fourth control valve 811 is used to control the on-off of the fourth pipeline 81. When the distillation tower is officially started, the liquid oxygen generated in the condenser evaporator 3 can ensure the amount of liquid oxygen in the liquid oxygen evaporator 8. At this time, the controller can control the fourth control valve 811 to be closed.

[0057] See also Figure 1 , illustratively, a liquid return pipe 82 is also provided on the pipeline connecting the outflow end of the liquid oxygen channel and the second oxygen inlet 45.

[0058] The liquid oxygen in the liquid oxygen channel is heat-exchanged with the air in the air channel to form oxygen. However, when the liquid oxygen is not completely converted, or when it is transported through a long-distance pipeline, some liquid oxygen will still remain. Therefore, the liquid oxygen can be discharged through the return liquid pipe 82; optionally, a recovery tank is provided at the discharge end, or the discharge end of the return liquid pipe 82 is connected to the above-mentioned buffer storage tank 7.

[0059] See also Figure 1 In some possible embodiments, a second exhaust pipe 62 is provided on the top of the liquid oxygen storage tank 6 , the second exhaust pipe 62 is connected to the air inlet 21 , and a second exhaust valve 621 is provided on the second exhaust pipe 62 .

[0060] After being placed for a period of time, the liquid oxygen in the liquid oxygen storage tank 6 will be partially gasified into oxygen. Therefore, in order to avoid the problem of excessive pressure in the liquid oxygen storage tank 6 causing potential safety hazards of the liquid oxygen storage tank 6, the oxygen can be discharged through the second exhaust pipe 62. The second exhaust valve 621 is used to control the on-off of the airflow on the second exhaust pipe 62. Specifically, the second exhaust valve 621 can be opened and closed at a fixed time so as to regularly exhaust the liquid oxygen storage tank 6.

[0061] Optionally, a second pressure sensor is provided on the liquid oxygen storage tank 6 to monitor the pressure in the liquid oxygen storage tank 6 in real time.

[0062] See also Figure 1 In some embodiments, the liquid nitrogen outlet 31 is also connected to the top of the lower tower 2 through a liquid nitrogen reflux pipe 32.

[0063] The liquid nitrogen outflow end at the condenser evaporator 3 is divided into two parts, one part enters the lower tower 2 to form reflux, and the other part enters the upper tower 1 for distillation to separate the nitrogen product.

[0064] During the operation of the distillation tower auxiliary startup device provided in the present application, first, the dried air is heat exchanged through the air channels of the main heat exchanger 4 and the liquid oxygen evaporator 8 to form primary cold air, and the primary cold air enters the lower tower 2 through the air inlet 21, and forms oxygen-rich liquid air at the bottom of the lower tower 2 and nitrogen at the top of the lower tower 2 in the lower tower 2.

[0065] Secondly, the oxygen-rich liquid air at the bottom of the lower tower 2 is introduced into the upper tower 1 for distillation to form low-purity liquid oxygen at the bottom of the upper tower 1. Since the liquid oxygen chamber is connected to the bottom of the upper tower 1, the low-purity liquid oxygen can enter the liquid oxygen chamber of the condenser evaporator 3.

[0066] Then, the nitrogen at the top of the lower tower 2 enters upward into the nitrogen channel of the condenser evaporator 3, so that the nitrogen in the nitrogen channel exchanges heat with the low-purity liquid oxygen in the liquid oxygen chamber, thereby forming liquid nitrogen at the other end of the nitrogen channel, so that a part of the liquid nitrogen enters the lower tower 2 to form a reflux, and the other part enters the upper tower 1 for distillation to separate the nitrogen product and discharge it from the nitrogen outlet 11, and form part of the dirty nitrogen and discharge it from the dirty nitrogen outlet 12; and the liquid oxygen in the liquid oxygen chamber forms the low-temperature first oxygen and is discharged from the first oxygen outlet 13, and forms the first oxygen product after heat exchange in the main heat exchanger 4.

[0067] Furthermore, when the fractionation tower is initially started, liquid oxygen can be introduced into the liquid oxygen chamber of the condenser evaporator 3 through the buffer storage tank 7 or the liquid oxygen storage tank 6, so that the liquid level in the liquid oxygen chamber reaches the working liquid level as soon as possible, thereby improving the starting efficiency; and the liquid oxygen in the liquid oxygen storage tank 6 can be introduced into the liquid oxygen channel of the liquid oxygen evaporator 8 through the fourth pipeline 81, so as to improve the starting efficiency of the liquid oxygen evaporator 8. Furthermore, when the fractionation tower is operating normally, if the liquid oxygen content in the liquid oxygen chamber is higher than a preset range, the liquid oxygen can be exported to the buffer storage tank 7 for temporary storage.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fractionation tower auxiliary startup device, characterized in that: include: The fractionation tower comprises an upper tower (1), a condenser evaporator (3) and a lower tower (2) which are arranged in sequence from top to bottom; an air inlet (21) is provided at the lower end of the lower tower (2), a first outlet (22) is provided at the bottom of the lower tower (2), and the first outlet (22) is communicated with the upper end of the upper tower (1); a nitrogen channel is provided in the condenser evaporator (3), one end of the nitrogen channel is communicated with the top of the lower tower (2), and the other end is a liquid nitrogen outlet (31), and the liquid nitrogen outlet (31) is communicated with the upper tower (1); a liquid oxygen chamber for heat exchange with the nitrogen chamber is provided in the condenser evaporator (3), and the top of the liquid oxygen chamber is communicated with the bottom of the upper tower (1); A liquid level sensor (5) is arranged on the condenser evaporator (3), and a detection end thereof extends into the liquid oxygen chamber; A liquid oxygen storage tank (6), wherein a first pipeline (61) is provided at an outflow end thereof, wherein the first pipeline (61) is in communication with the liquid oxygen storage chamber; a first control valve (611) is provided on the first pipeline (61); wherein after the temperature in the fractionation tower reaches a preset temperature value, the liquid oxygen storage tank (6) is used to introduce liquid oxygen into the liquid oxygen storage chamber; and A controller is connected to the first control valve (611) and the liquid level sensor (5) respectively; wherein when the liquid level in the liquid oxygen chamber is higher than a preset value, the controller controls the first control valve (611) to close.

2. The fractionation tower auxiliary startup device according to claim 1, characterized in that: The fractionation tower auxiliary startup device further comprises a buffer storage tank (7), wherein the buffer storage tank (7) is connected to the lower end of the liquid oxygen storage chamber via a second pipeline (71), and a second control valve (711) is provided on the second pipeline (71), and the second control valve (711) is connected to the controller.

3. The fractionation tower auxiliary startup device as claimed in claim 2, characterized in that: The buffer storage tank (7) is also connected to the first pipeline (61) via a third pipeline (72), and a third control valve (721) is provided on the third pipeline (72), and the third control valve (721) is connected to the controller.

4. The fractionation tower auxiliary startup device as claimed in claim 3, characterized in that: The first pipeline (61) is provided with a first one-way valve (612), and the first one-way valve (612) is located between the connection end of the third pipeline (72) and the outflow end of the liquid oxygen storage tank (6).

5. The fractionation tower auxiliary startup device according to claim 4, characterized in that: A first exhaust pipe (73) is provided on the top of the buffer storage tank (7), and the first exhaust pipe (73) is connected to the air inlet (21); a first exhaust valve (731) is provided on the first exhaust pipe (73).

6. The fractionation tower auxiliary startup device according to claim 1, characterized in that: The upper tower (1) is also provided with a nitrogen outlet (11), a dirty nitrogen outlet (12) and a first oxygen outlet (13) which are arranged in sequence from top to bottom; the fractionation tower auxiliary startup device also includes: The main heat exchanger (4) is provided with an air outlet (41); the main heat exchanger (4) is also provided with a first oxygen inlet (44) connected to the first oxygen outlet (13), a nitrogen inlet (42) connected to the nitrogen outlet (11), a dirty nitrogen inlet (43) connected to the dirty nitrogen outlet (12), and a second oxygen inlet (45); The liquid oxygen evaporator (8) is provided with an air channel and a liquid oxygen channel inside, wherein the inlet end of the air channel is connected to the air outlet (41), and the outlet end is connected to the air inlet (21); the inlet end of the liquid oxygen channel is connected to the liquid oxygen storage chamber, and the outlet end is connected to the second oxygen inlet (45).

7. The fractionation tower auxiliary startup device according to claim 6, characterized in that: The inlet end of the liquid oxygen channel is also connected to the outlet end of the liquid oxygen storage tank (6) through a fourth pipeline (81); a fourth control valve (811) is provided on the fourth pipeline (81); and the fourth control valve (811) is connected to the controller.

8. The fractionation tower auxiliary startup device according to claim 6 or 7, characterized in that: A liquid return pipe (82) is also provided on the pipeline connecting the outflow end of the liquid oxygen channel and the second oxygen inlet (45).

9. The fractionation tower auxiliary startup device according to claim 1, characterized in that: A second exhaust pipe (62) is provided on the top of the liquid oxygen storage tank (6), the second exhaust pipe (62) is in communication with the air inlet (21), and a second exhaust valve (621) is provided on the second exhaust pipe (62).

10. The fractionation tower auxiliary startup device according to claim 1, characterized in that: The liquid nitrogen outlet (31) is also connected to the top of the lower tower (2) via a liquid nitrogen reflux pipe (32).

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