Neon and helium series krypton and xenon purification device

Abstract

The utility model discloses a neon and helium series connection krypton and xenon purification device which comprises a heat exchanger, a neon and helium rectifying tower, a condenser, a first purifier, a second purifier, an evaporator and a krypton and xenon rectifying tower, the bottom of the neon and helium rectifying tower is connected with a fifth pipeline, and the condenser is arranged on the fifth pipeline. The input end of the condenser is externally connected with liquid nitrogen supply equipment through a third pipeline, the heat exchanger and the condenser are connected through a second pipeline, the heat exchanger and the evaporator are connected through a seventh pipeline, and the input end of the heat exchanger is externally connected with air supply equipment through a first pipeline. The input end of the evaporator is externally connected with air supply equipment through an eighth pipeline; the system further comprises a twelfth pipeline, a thirteenth pipeline and a sixteenth pipeline. According to the device, neon and helium and krypton and xenon can be communicated through air under the condition that operation of a main device is not affected, separated liquid nitrogen can serve as a cold source to be recycled, and neon and helium are obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of neon, helium, krypton and xenon purification devices, in particular to a neon-helium series krypton-xenon purification device. Background Art

[0002] Krypton and xenon are rare gases. Due to their characteristics, krypton and xenon are widely used in various industries such as filling gas for lighting fixtures, manufacturing of flat-screen TVs, manufacturing of electronic chips, manufacturing of glass, space and satellites, medical treatment, basic scientific research, etc. Neon is a colorless, odorless, non-flammable gas. Neon only exists as a single substance. Under normal circumstances, neon does not form compounds. The light is orange and is often used to make special lamps. It can also be used for low-temperature cooling, voltage regulation, and laser mixing. Helium is an inert gas and the only gas that solidifies under normal atmospheric pressure. Helium is widely used in research, medicine, aviation and other fields.

[0003] Currently, neon, helium, krypton and xenon are mainly extracted from the by-products of air separation units.

[0004] In air separation units, krypton and xenon are mainly present in liquid oxygen and oxygen-rich liquid air products. With the large-scale development of air separation units, the raw material liquid oxygen for extracting krypton and xenon in air separation units is also growing exponentially. Therefore, the recovery of krypton and xenon from liquid oxygen or oxygen-rich liquid air has great economic prospects. According to the physical properties of atmospheric components and the organizational characteristics of air separation processes, krypton and xenon are extracted either from the oxygen-rich liquid air in the lower tower or from the liquid oxygen in the upper tower. The liquid oxygen product of the air separation unit compressed in liquid oxygen is obtained by compressing the main cooling liquid oxygen through a pump. Since krypton and xenon are mainly present in liquid oxygen, the liquid oxygen product will take away a large amount of krypton and xenon, which reduces the extraction rate of krypton and xenon and increases the difficulty of the extraction process of krypton and xenon. However, the traditional extraction method has certain defects: the air separation unit can only produce crude krypton and xenon when producing argon, and when producing crude krypton and xenon, it is easy to cause the operation of the main tower and the crude argon tower to be extremely unstable, which reduces the extraction rate of oxygen, nitrogen and argon.

[0005] The main method for extracting crude neon and helium from the air is low-temperature fractionation. This method is to compress, cool and purify the air, and then perform multi-stage fractionation at low temperature to obtain components of gases such as oxygen, nitrogen, argon, krypton, xenon, neon and helium. Among them, the components rich in neon and helium are further fractionated in the final neon-helium tower fractionation tower to obtain crude neon and helium. However, the extraction method has certain defects: low production efficiency and low product purity; difficult operation and high safety risks; few by-products of traditional air separation, low economic added value, and serious product homogeneity. Utility Model Content

[0006] 1. Technical problems to be solved by the utility model

[0007] The utility model aims to solve the technical problems existing in the prior art and provides a neon-helium series krypton-xenon purification device, which can connect neon-helium and krypton-xenon with air without affecting the operation of the main device, and the separated liquid nitrogen can be recycled as a cold source to obtain neon-helium.

[0008] 2. Technical solution

[0009] In order to solve the above problems, the technical solution provided by the utility model is:

[0010] A neon-helium series krypton-xenon purification device comprises a heat exchanger, a neon-helium distillation tower, a condenser, a first purifier, a second purifier, an evaporator and a krypton-xenon distillation tower, wherein the bottom of the neon-helium distillation tower is connected with a fifth pipeline, the condenser is arranged on the fifth pipeline, the input end of the condenser is externally connected with a liquid nitrogen supply device through a third pipeline, the heat exchanger and the condenser are connected through a second pipeline, the heat exchanger and the evaporator are connected through a seventh pipeline, the input end of the heat exchanger is externally connected with an air supply device through a first pipeline, and the input end of the evaporator is externally connected with an air supply device through an eighth pipeline; further comprising a twelfth pipeline, a thirteenth pipeline and a sixteenth pipeline, the twelfth pipeline is connected to the upper part of the krypton-xenon distillation tower and connected with the first purifier and the second purifier, the thirteenth pipeline is connected to the lower part of the krypton-xenon distillation tower and connected with the first purifier and the second purifier, and the sixteenth pipeline is connected to the input ends of the first purifier and the second purifier and externally connected with a nitrogen delivery device.

[0011] Optionally, a cold box is further included, in which the heat exchanger, the neon-helium distillation tower, the condenser, the first purifier, the second purifier, the evaporator and the krypton-xenon distillation tower are all installed.

[0012] Optionally, a first throttle valve is provided on the twelfth pipeline.

[0013] Optionally, a second throttle valve is provided on the thirteenth pipeline.

[0014] Optionally, the neon-helium distillation tower and the krypton-xenon distillation tower are both packed towers or pressure towers.

[0015] Optionally, the heat exchanger, the condenser and the evaporator are all vacuum brazed plate-fin heat exchangers.

[0016] Optionally, an eleventh pipeline is connected in parallel to the input ends of the first purifier and the second purifier, and the eleventh pipeline is externally connected to a liquid oxygen supply device.

[0017] Optionally, the input end of the neon-helium distillation tower is connected to a fourth pipeline, and the fourth pipeline is externally connected to a non-condensable gas supply device.

[0018] 3. Beneficial effects

[0019] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0020] The neon-helium series krypton-xenon purification device can be isolated from the main device. Without affecting the operation of the main device, the air connects the neon-helium and krypton-xenon. The separated liquid nitrogen can be recycled as a cold source to obtain neon-helium. Moreover, different krypton and xenon are obtained by different feed amounts of the upper and lower krypton-xenon distillation towers. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of a neon-helium series krypton-xenon purification device proposed in an embodiment of the utility model;

[0022] 1. heat exchanger; 2. neon-helium distillation tower; 3. condenser; 4. first purifier; 5. second purifier; 6. condenser; 7. krypton-xenon distillation tower; V31, first throttle valve; V32, second throttle valve; a1, first pipeline; a2, second pipeline; a3, third pipeline; a4, fourth pipeline; a5, fifth pipeline; a6, sixth pipeline; a7, seventh pipeline; a8, eighth pipeline; a9, ninth pipeline; a10, tenth pipeline; a11, eleventh pipeline; a12, twelfth pipeline; a13, thirteenth pipeline; a14, fourteenth pipeline; a15, fifteenth pipeline; a16, sixteenth pipeline. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described here are only used to explain the utility model and do not limit the protection scope of the utility model.

[0024] It should be noted that when an element is referred to as being "fixed to", "disposed on", "fixed on" or "installed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. Further, when an element is considered to be "fixedly connected to" another element, the two may be fixed in a detachable connection manner or in a non-detachable connection manner, such as socketing, snap-on, one-piece fixation, welding, etc., which can be achieved in the prior art and will not be repeated here. When an element is perpendicular or approximately perpendicular to another element, it means that the ideal state of the two is vertical, but due to the influence of manufacturing and assembly, there may be a certain vertical error. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0026] The “first” and “second” involved in the present utility model do not represent specific quantities and orders, but are merely used to distinguish names.

[0027] Combined with Figure 1 A neon-helium series krypton-xenon purification device of this embodiment includes a heat exchanger 1, a neon-helium distillation tower 2, a condenser 3, a first purifier 4, a second purifier 5, an evaporator 6 and a krypton-xenon distillation tower 7; a fifth pipeline a5 connected to the bottom of the neon-helium distillation tower 2, and the fifth pipeline a5 is connected in series with the condenser 3; the input end of the condenser 3 is connected to the third pipeline a3, and the third pipeline a3 is externally connected to a liquid nitrogen supply device; a second pipeline a2 connecting the heat exchanger 1 and the condenser 3 in series; a seventh pipeline a7 connecting the heat exchanger 1 and the evaporator 6 in series; the input end of the heat exchanger 1 is connected to the first pipeline a1, the second pipeline a2 connecting the heat exchanger 1 and the evaporator 6 in series; the input end of the heat exchanger 1 is connected to the first pipeline a1, the second pipeline a3 connecting the heat exchanger 1 and the evaporator 6 in series; the input end of the heat exchanger 1 is connected to the first pipeline a1, the second pipeline a2 ... A pipeline a1 is externally connected to an air supply device; an input end of the evaporator 6 is connected to an eighth pipeline a8, and the eighth pipeline a8 is externally connected to an air supply device; a twelfth pipeline a12 is connected to the upper portion of the krypton-xenon distillation tower 7, and the first purifier 4 and the second purifier 5 are connected in series to the twelfth pipeline a12; a thirteenth pipeline a13 is connected to the lower portion of the krypton-xenon distillation tower 7, and the first purifier 4 and the second purifier 5 are connected in series to the thirteenth pipeline a13; a sixteenth pipeline a16 is connected to the input ends of the first purifier 4 and the second purifier 5, and the sixteenth pipeline a16 is externally connected to a nitrogen delivery device.

[0028] Working principle: the raw material non-condensable gas is sent to the neon-helium distillation tower 2 for distillation. The crude neon-helium gas at the top of the neon-helium distillation tower 2 exchanges heat with the condenser 3 and is sent out as a neon-helium product through the sixth pipeline a6. Liquid nitrogen is obtained at the bottom of the neon-helium distillation tower 2 and is sent to the condenser 3 through the fifth pipeline a5 as a cold source, and then reheated through the heat exchanger 1 through the second pipeline a2 and sent out as nitrogen. External liquid nitrogen can also be sent to the condenser 3 through the third pipeline a3. After being cooled by the heat exchanger 1, the air is sent to the evaporator 6 as a heat source through the seventh pipeline a7, becomes liquid air and is sent out through the ninth pipeline a9, and part of it becomes non-condensable gas and is sent out through the tenth pipeline a10. External air can also be sent to the evaporator 6 through the eighth pipeline a8. The liquid oxygen enters the first purifier 4 and the second purifier 5 to adsorb various impurities, and then is sent to the krypton-xenon distillation tower 7 for distillation through the twelfth pipeline a12 and the thirteenth pipeline a13. The oxygen obtained at the top of the krypton-xenon distillation tower 7 is sent out as an oxygen product through the fourteenth pipeline a14. The krypton-depleted xenon product obtained at the bottom of the krypton-xenon distillation tower 7 is sent out as a krypton-xenon product through the fifteenth pipeline a15.

[0029] As a preferred embodiment of the present invention, the first purifier 4, the second purifier 5, the neon-helium distillation tower 2, the krypton-xenon distillation tower 7, the condenser 3, the evaporator 6 and the heat exchanger 1 are all installed in a cold box. The main function of the cold box is to perform efficient, heat-insulating and cold-preserving low-temperature heat exchange, which can reduce the loss of cold and play a role in cold preservation.

[0030] As a preferred solution of the utility model, a first throttle valve v31 is provided on the twelfth pipeline a12, and a second throttle valve v32 is provided on the thirteenth pipeline a13, so as to effectively control the flow of fluid or gas passing through the twelfth pipeline a12 and the thirteenth pipeline a13, and the feed amount can be adjusted to match different working conditions.

[0031] As a preferred solution of the present invention, the neon-helium distillation tower 2 and the krypton-xenon distillation tower 7 are both packed towers or pressure towers, which can make the device operation elastic load large.

[0032] As a preferred solution of the present utility model, the evaporator 6, the condenser 3 and the heat exchanger 1 are all vacuum brazed plate-fin heat exchangers, which can reduce the heat exchange temperature difference of the device.

[0033] As a preferred embodiment of the present invention, the input ends of the first purifier 4 and the second purifier 5 are connected in parallel with an eleventh pipeline a11, and the eleventh pipeline a11 is externally connected to a liquid oxygen supply device, which can make the external supply device of the device diverse and have a large selection range. The input section of the purifier is connected to the liquid oxygen supply device through the eleventh pipeline a11 and the sixteenth pipeline a16 is connected to the nitrogen delivery device.

[0034] As a preferred solution of the utility model, the input end of the neon-helium distillation tower 2 is connected with a fourth pipeline a4, and the fourth pipeline a4 is externally connected to a non-condensable gas supply device, so that the external supply device of the device can be diversified and the selection range is large.

[0035] It should be noted that the liquid nitrogen supply equipment, non-condensable gas supply equipment, air supply equipment, liquid oxygen supply equipment, nitrogen supply equipment and liquid air collection equipment in the above embodiments are all well-known technologies to those skilled in the art and will not be described in detail.

[0036] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A neon-helium series krypton-xenon purification device, characterized in that: The invention comprises a heat exchanger, a neon-helium distillation tower, a condenser, a first purifier, a second purifier, an evaporator and a krypton-xenon distillation tower, wherein the bottom of the neon-helium distillation tower is connected with a fifth pipeline, the condenser is arranged on the fifth pipeline, the input end of the condenser is externally connected with a liquid nitrogen supply device through a third pipeline, the heat exchanger and the condenser are connected through a second pipeline, the heat exchanger and the evaporator are connected through a seventh pipeline, the input end of the heat exchanger is externally connected with an air supply device through a first pipeline, and the input end of the evaporator is externally connected with an air supply device through an eighth pipeline; the invention also comprises a twelfth pipeline, a thirteenth pipeline and a sixteenth pipeline, the twelfth pipeline is connected to the upper part of the krypton-xenon distillation tower and connected with the first purifier and the second purifier, the thirteenth pipeline is connected to the lower part of the krypton-xenon distillation tower and connected with the first purifier and the second purifier, and the sixteenth pipeline is connected to the input ends of the first purifier and the second purifier and externally connected with a nitrogen delivery device.

2. A neon-helium series krypton-xenon purification device according to claim 1, characterized in that: It also includes a cold box, in which the heat exchanger, the neon-helium distillation tower, the condenser, the first purifier, the second purifier, the evaporator and the krypton-xenon distillation tower are all installed.

3. A neon-helium series krypton-xenon purification device according to claim 1, characterized in that: The twelfth pipeline is provided with a first throttle valve.

4. A neon-helium series krypton-xenon purification device according to claim 1, characterized in that: A second throttle valve is arranged on the thirteenth pipeline.

5. The neon-helium series krypton-xenon purification device according to claim 1, characterized in that: The neon-helium distillation tower and the krypton-xenon distillation tower are both packed towers or pressure towers.

6. The neon-helium series krypton-xenon purification device according to claim 1, characterized in that: The heat exchanger, the condenser and the evaporator are all vacuum brazed plate-fin heat exchangers.

7. A neon-helium series krypton-xenon purification device according to any one of claims 1 to 6, characterized in that: The input ends of the first purifier and the second purifier are connected in parallel with an eleventh pipeline, and the eleventh pipeline is externally connected to a liquid oxygen supply device.

8. A neon-helium series krypton-xenon purification device according to any one of claims 1 to 6, characterized in that: The input end of the neon-helium distillation tower is connected with a fourth pipeline, and the fourth pipeline is externally connected with a non-condensable gas supply device.

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