Nitrogen-making device with high-purity oxygen

Abstract

The embodiment of the utility model provides a nitrogen generation device with high-purity oxygen. The nitrogen generation device comprises a gas compression system, a pre-cooling system, a purification system, a fractionating tower, a rectifying tower, an expansion machine and a high-purity oxygen tower, the gas compression system, the pre-cooling system and the purification system are sequentially connected, and the purification system adopts a vertical adsorber; the purification system and the rectifying tower are connected with a main heat exchanger of the fractionating tower; the expander is connected with the main heat exchanger and the rectifying tower; the high-purity oxygen tower is connected with the rectifying tower, and an internal compression liquid pump is arranged in the high-purity oxygen tower. According to the embodiment of the invention, high-purity oxygen and liquid oxygen with pressure can be directly produced, so that the generated high-purity liquid oxygen can directly enter the high-purity oxygen storage tank, the high-purity gas oxygen directly enters the oxygen pipe network, an oxygen compressor is omitted, the explosion risk of the oxygen compressor is avoided, and the energy consumption is reduced. The maintenance cost of the oxygen compressor is reduced, and the occupied area of the oxygen compressor is saved.

Description

Technical Field

[0001] The present application relates to the technical field of gas preparation, and particularly to a nitrogen production device with high-purity oxygen. Background Art

[0002] In recent years, in the industrial gas market, in addition to nitrogen-related products, high-purity oxygen products are also popular products. Therefore, the technology of producing high-purity oxygen during the nitrogen production process has become a topic of research in factories. In the existing technology, although some nitrogen production devices can produce high-purity oxygen while producing nitrogen, the pressure of the produced high-purity oxygen is low and it is not easy to enter the high-purity oxygen storage tank. For this reason, the existing technology often uses an oxygen compressor to obtain high-purity oxygen with a higher pressure, so that the liquid oxygen in the high-purity oxygen can more easily enter the high-purity oxygen storage tank, and the gaseous oxygen in the high-purity oxygen can more easily enter the oxygen network pipe. However, this method has the following problems: 1. Using an oxygen compressor has an explosion risk and the equipment operation is not safe; 2. The oxygen compressor requires daily maintenance, increasing the maintenance cost.

[0003] Therefore, there are defects in the existing technology and it needs to be improved and developed. Summary of the Utility Model

[0004] The embodiment of the present application provides a nitrogen production device with high-purity oxygen, which can obtain high-purity oxygen gas and liquid oxygen with a higher pressure without using an oxygen compressor, so that the generated high-purity liquid oxygen can directly enter the high-purity oxygen storage tank, and the high-purity gaseous oxygen directly enters the oxygen network pipe.

[0005] The embodiment of the present application provides a nitrogen production device with high-purity oxygen, including a gas compression system, a precooling system, a purification system, a fractionating tower, a rectifying tower, an expander and a high-purity oxygen tower;

[0006] The gas compression system, the precooling system and the purification system are connected in sequence, wherein the purification system uses a vertical adsorber;

[0007] Both the purification system and the rectifying tower are connected to the main heat exchanger of the fractionating tower;

[0008] The expander is connected to both the main heat exchanger and the rectifying tower;

[0009] The high-purity oxygen tower is connected to the rectifying tower, wherein an internal compression liquid pump is arranged in the high-purity oxygen tower.

[0010] In the nitrogen production device with high-purity oxygen described in the embodiment of the present application, the rectifying tower includes a main tower and an auxiliary tower;

[0011] The expander is connected to the auxiliary tower, the high-purity oxygen tower is connected to the main tower, and the main heat exchanger is connected to the main tower;

[0012] The main tower includes a main condenser, and the main condenser is connected to the auxiliary tower;

[0013] The auxiliary tower includes an auxiliary condenser, and the auxiliary condenser is connected to the main tower.

[0014] In the nitrogen production device with high-purity oxygen according to the embodiment of the present application, a subcooler is further included;

[0015] The auxiliary condenser, the high-purity oxygen tower, and the main heat exchanger are all connected to the subcooler;

[0016] The oxygen-rich liquid air extracted from the main tower is subcooled by the subcooler and then enters the main condenser for evaporation.

[0017] In the nitrogen production device with high-purity oxygen according to the embodiment of the present application, a cryogenic pump is further included;

[0018] The cryogenic pump is connected to both the main tower and the auxiliary tower.

[0019] In the nitrogen production device with high-purity oxygen according to the embodiment of the present application, the bottom of the high-purity oxygen tower uses copper and filter fins with a certain thickness as fillers.

[0020] In the nitrogen production device with high-purity oxygen according to the embodiment of the present application, the gas compression system is an air compressor.

[0021] In the nitrogen production device with high-purity oxygen according to the embodiment of the present application, a high-purity oxygen storage tank is further included;

[0022] The high-purity oxygen storage tank is connected to the high-purity oxygen tower and is used to store the generated high-purity oxygen.

[0023] In the nitrogen production device with high-purity oxygen provided by the embodiment of the present application, since an internal compression liquid pump is provided in the high-purity oxygen tower, the high-purity oxygen tower is a high-purity oxygen tower with pressure. Therefore, high-purity oxygen gas and liquid oxygen with pressure can be directly produced, so that the generated high-purity liquid oxygen can directly enter the high-purity oxygen storage tank, and the high-purity gaseous oxygen directly enters the oxygen pipeline network. Thus, the oxygen compressor is omitted, the explosion risk of the oxygen compressor is avoided, the maintenance cost of the oxygen compressor is reduced, and the floor area occupied by the oxygen compressor is saved. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a schematic structural diagram of the nitrogen production device with high-purity oxygen provided by the embodiment of the present application.

[0026] Description of the reference numerals in the drawings:

[0027] 10 - Gas compression system 20 - Pre - cooling system 30 - Purification system

[0028] 40 - Rectifying column 50 - Expander 60 - High - purity oxygen column

[0029] 70 - Main heat exchanger 80 - Main condenser 90 - Auxiliary condenser

[0030] 100 - Sub - cooler 110 - Cryogenic pump 401 - Main column

[0031] 402 - Auxiliary column Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present application.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application 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. Therefore, it cannot be understood as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0034] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows mutual communication; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0035] In the present application, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0036] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0037] An embodiment of the present application provides a nitrogen production device with high-purity oxygen. Refer to Figure 1 , the nitrogen production device with high-purity oxygen includes a gas compression system 10, a precooling system 20, a purification system 30, a fractionating column, a rectifying column 40, an expander 50, and a high-purity oxygen column 60.

[0038] The gas compression system 10, the precooling system 20, and the purification system 30 are connected in sequence. Among them, the purification system 30 uses a vertical adsorber.

[0039] Among them, the purification system 30 is used to adsorb moisture, carbon dioxide, and hydrocarbons in the raw air.

[0040] Among them, the purification system 30 uses a large-diameter vertical adsorber instead of a conventional horizontal adsorber, thus saving the floor area of the device.

[0041] Both the purification system 30 and the rectification column 40 are connected to the main heat exchanger 70 of the fractionating column.

[0042] The expander 50 is connected to both the main heat exchanger 70 and the rectification column 40.

[0043] The high-purity oxygen column 60 is connected to the rectification column 40, and an internal compression liquid pump is provided in the high-purity oxygen column 60.

[0044] Among them, by providing an internal compression liquid pump in the high-purity oxygen column 60, the high-purity oxygen column 60 becomes a high-purity oxygen column with pressure, so that high-purity oxygen gas and liquid oxygen with pressure can be directly produced. As a result, the generated high-purity liquid oxygen can directly enter the high-purity oxygen storage tank, and the high-purity gaseous oxygen directly enters the oxygen pipeline network. Thus, the oxygen compressor is omitted, the explosion risk of the oxygen compressor is avoided, the maintenance cost of the oxygen compressor is reduced, the floor area occupied by the oxygen compressor is saved, and the height of the cold box is reduced.

[0045] In some embodiments, the rectification column 40 includes a main column 401 and an auxiliary column 402; the expander 50 is connected to the auxiliary column 402, the high-purity oxygen column 60 is connected to the main column 401, and the main heat exchanger 70 is connected to the main column 401; the main column 401 includes a main condenser 80, and the main condenser 80 is connected to the auxiliary column 402; the auxiliary column 402 includes an auxiliary condenser 90, and the auxiliary condenser 90 is connected to the main column 401.

[0046] Among them, both the main column 401 and the auxiliary column 402 are rectification columns, and both the main condenser 80 and the auxiliary condenser 90 are condensing evaporators.

[0047] In some embodiments, the nitrogen production device with high-purity oxygen further includes a subcooler 100, and the auxiliary condenser 90, the high-purity oxygen column 60, and the main heat exchanger 70 are all connected to the subcooler 100; the oxygen-rich liquid air extracted from the main column 401 is subcooled by the subcooler 100 and then enters the main condenser 80 for evaporation.

[0048] In some embodiments, the nitrogen production device with high-purity oxygen further includes a cryogenic pump 110, and the cryogenic pump 110 is connected to both the main column 401 and the auxiliary column 402.

[0049] In some embodiments, the bottom of the high-purity oxygen column 60 uses copper and filter fins with a certain thickness as fillers.

[0050] Among them, using copper and filter fins with a certain thickness as fillers at the bottom of the high-purity oxygen column 60 can reduce the explosion risk of the cold box, thereby improving the safety of the device.

[0051] In some embodiments, the gas compression system 10 is an air compressor.

[0052] In some embodiments, the nitrogen generation device with high-purity oxygen further includes a high-purity oxygen storage tank, which is connected to the high-purity oxygen tower 60 and is used to store the generated high-purity oxygen.

[0053] The working process of the nitrogen generation device with high-purity oxygen in this application is as follows: The raw air is compressed by the gas compression system 10 (air compressor) to a certain pressure, cooled by the precooling system 20, and then enters the purification system 30. After the moisture, carbon dioxide, and hydrocarbons in the raw air are adsorbed in the purification system 30, it enters the fractionating tower. In the main heat exchanger 70 of the fractionating tower, the air exchanges heat with the refluxing rich oxygen and nitrogen, and the temperature drops to near the air liquefaction point and enters the main tower 401 for rectification. High-purity nitrogen is obtained at the top of the main tower 401. Part of this high-purity nitrogen is used as product nitrogen, which is reheated by the main heat exchanger 70 and then sent out of the fractionating tower to the user; another part is condensed and liquefied by the main condenser 80 to obtain liquid nitrogen. Part of the obtained liquid nitrogen is output as a product, and another part re-enters the main tower 401 as reflux liquid to participate in rectification, and oxygen-rich liquid air is obtained after rectification. The oxygen-rich liquid air extracted from the bottom of the main tower 401 is subcooled by the subcooler 100 and then throttled to evaporate in the main condenser 80. After the oxygen-rich liquid air evaporates in the main condenser 80, part of it enters the auxiliary tower 402 for rectification. The rectified liquid nitrogen enters the main tower 401 through the cryogenic pump 110. The liquid air after throttling enters the auxiliary condenser 90 and converges with the unevaporated liquid air in the main condenser 80 to evaporate. The evaporated steam is reheated by the subcooler 100 and the main heat exchanger 70 and then sent to the purification system as the regeneration gas and cold purge gas of the purification system 30. Part of the steam enters the main heat exchanger 70 and then enters the expander 50 for refrigeration. The expanded air enters the auxiliary tower 402. Part of the liquid air is extracted from the bottom of the main tower 401 and enters the high-purity oxygen tower 60. The high-purity oxygen at the bottom exits the cold box after being cooled by the subcooler 100.

[0054] In summary, the nitrogen generation device with high-purity oxygen provided by the embodiments of this application includes a gas compression system 10, a precooling system 20, a purification system 30, a fractionating tower, a rectification tower 40, an expander 50, and a high-purity oxygen tower 60; the gas compression system 10, the precooling system 20, and the purification system 30 are connected in sequence. Among them, the purification system 30 uses a vertical adsorber; both the purification system 30 and the rectification tower 40 are connected to the main heat exchanger 70 of the fractionating tower; the expander 50 is connected to both the main heat exchanger 70 and the rectification tower 40; the high-purity oxygen tower 60 is connected to the rectification tower 40. Among them, an internal compression liquid pump is provided in the high-purity oxygen tower 60. In the nitrogen generation device with high-purity oxygen provided by the embodiments of this application, since an internal compression liquid pump is provided in the high-purity oxygen tower, the high-purity oxygen tower is a high-purity oxygen tower with pressure. Therefore, it can directly produce high-purity oxygen gas and liquid oxygen with pressure, so that the generated high-purity liquid oxygen can directly enter the high-purity oxygen storage tank, and the high-purity gaseous oxygen can directly enter the oxygen pipeline network, eliminating the oxygen compressor, avoiding the explosion risk of the oxygen compressor, reducing the maintenance cost of the oxygen compressor, and saving the floor area occupied by the oxygen compressor.

[0055] In the above embodiments, the descriptions of the respective embodiments have their own focuses. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0056] The above has introduced in detail a nitrogen production device with high-purity oxygen provided by the embodiments of the present application. Specific examples are used herein to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A nitrogen production device with high purity oxygen, characterized in that: It includes gas compression system, precooling system, purification system, fractionation tower, rectification tower, expander and high purity oxygen tower; The gas compression system, precooling system and purification system are connected in sequence, wherein the purification system adopts a vertical adsorber; The purification system and the rectification tower are both connected to the main heat exchanger of the fractionation tower; The expander is connected to the main heat exchanger and the distillation tower at the same time; The high-purity oxygen tower is connected to the distillation tower, wherein an internal compression liquid pump is provided in the high-purity oxygen tower.

2. The nitrogen production device with high purity oxygen according to claim 1, characterized in that: The distillation tower comprises a main tower and an auxiliary tower; The expander is connected to the auxiliary tower, the high purity oxygen tower is connected to the main tower, and the main heat exchanger is connected to the main tower; The main tower includes a main cooler, and the main cooler is connected to the auxiliary tower; The auxiliary tower includes an auxiliary cooler, and the auxiliary cooler is connected to the main tower.

3. The nitrogen production device with high purity oxygen as claimed in claim 2, characterized in that: Also includes a subcooler; The auxiliary cooling tower, the high purity oxygen tower and the main heat exchanger are all connected to the subcooler; The oxygen-rich liquid air extracted from the main tower is supercooled by the supercooler and then evaporated in the main cooling unit.

4. The nitrogen production device with high purity oxygen as claimed in claim 3, characterized in that: Also included are cryogenic pumps; The cryogenic pump is connected to both the main tower and the auxiliary tower.

5. The nitrogen production device with high purity oxygen as claimed in claim 1, characterized in that: The bottom of the high-purity oxygen tower uses copper and filter fins of a certain thickness as fillers.

6. The nitrogen production device with high purity oxygen according to claim 1, characterized in that: The gas compression system is an air compressor.

7. The nitrogen production device with high purity oxygen according to claim 1, characterized in that: Also included is a high purity oxygen storage tank; The high-purity oxygen storage tank is connected to the high-purity oxygen tower and is used to store the generated high-purity oxygen.

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