Nitrogen recycling device in krypton-xenon refining system
By designing a nitrogen recovery and utilization device in the krypton-xenon refining system, the cooling capacity of the nitrogen vaporized in the condenser is used to cool and reheat the raw material gas, thus solving the problem of liquid nitrogen waste, realizing the effective utilization of nitrogen cooling capacity and stable system operation, and reducing energy consumption.
Patent Information
- Application Number
- CN202422949388.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-11-29
AI Technical Summary
In the refining process of krypton and xenon, liquid nitrogen is directly discharged as waste gas, resulting in waste of nitrogen and cold source, and increasing production costs.
Design a nitrogen recovery and utilization device in a krypton-xenon refining system. The nitrogen gas vaporized by the condenser is used to cool the raw gas and then reheated into the regeneration gas of the adsorber. The nitrogen gas is used to circulate multiple times, avoiding freezing and blockage, and achieving stable operation.
This technology enables the effective recovery and utilization of nitrogen cooling capacity, reduces energy consumption, and improves the stability and economy of the krypton-xenon refining system.
Smart Images
Figure CN223570385U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to krypton xenon refining technical field especially, it is a kind of nitrogen recovery and utilization device in krypton xenon refining system. BACKGROUND
[0002] Krypton and xenon are rare gases, which have important uses in many industrial and scientific fields. In the process of preparing and purifying krypton and xenon, the processes of vaporizing the raw material, removing water, and rectifying are generally included. In conventional production, liquid nitrogen is used to condense the gas phase produced in the rectifying column during the rectification process. This not only enables the separation of non-condensable gases, but also enables the reflux of the rectifying column and the extraction of liquid oxygen. After the aforementioned condensation and vaporization, the liquid nitrogen is generally directly discharged as waste gas. This results in the waste of nitrogen and the cold source contained in the nitrogen, thereby increasing the cost of krypton and xenon refining. SUMMARY
[0003] The utility model aims at solving the defects in the prior art, and provides a kind of nitrogen recovery and utilization device in krypton xenon refining system.
[0004] To achieve the above object, the utility model provides the following technical scheme:
[0005] A kind of nitrogen recovery and utilization device in krypton xenon refining system, including krypton xenon raw gas pipeline, krypton xenon raw gas pipeline is connected with the light removal rectifying portion by water removal unit, the light removal rectifying portion's column kettle liquid outlet pipeline is connected with the krypton xenon separation column of subsequent krypton xenon purification section, the light removal rectifying portion includes light removal rectifying column, the gas phase outlet of the light removal rectifying column top is connected with the tube side of condenser, and the tube side outlet of condenser is respectively connected with the reflux liquid inlet of light removal rectifying column and liquid oxygen storage tank;Water removal unit at least includes the first channel of first heat exchanger connected with krypton xenon raw gas pipeline, and the first channel of first heat exchanger is connected with the first channel of second heat exchanger and light removal rectifying column by adsorber;Liquid nitrogen storage tank is connected with adsorber with regenerating gas buffer tank by the shell side of condenser and the second channel of second heat exchanger, and the outlet of adsorber with regenerating gas buffer tank is connected with adsorber.
[0006] The utility model has the advantages that: the utility model is applied to krypton xenon refining system, mainly used for recovering the cold energy contained in the condensing medium from the condenser in the light removal rectifying portion and the condensing medium itself. Specifically, in the utility model, the cold energy in the nitrogen gas vaporized by the condenser is used to cool the krypton xenon raw gas. This cooling not only enables the krypton xenon raw gas to meet the operating requirements of the light removal rectifying column, but also enables the nitrogen gas to be reheated for its entry into the adsorber as regenerating gas.
[0007] Preferably, the second passage of the second heat exchanger is connected with the second passage of the first heat exchanger, and the outlet of the second passage of the first heat exchanger is connected with the adsorber regenerating gas buffer tank.
[0008] Preferably, a first three-way pipe is arranged between the second passage of the second heat exchanger and the second passage of the first heat exchanger, a second three-way pipe is arranged between the outlet of the second passage of the first heat exchanger and the adsorber regenerating gas buffer tank, and a short-circuit pipe with a flow regulating valve is arranged between the first three-way pipe and the second three-way pipe.
[0009] Preferably, a heating furnace is arranged between the second three-way pipe and the adsorber regenerating gas buffer tank.
[0010] Preferably, a blowdown port is arranged on the first passage of the first heat exchanger and connected with a blowdown pipe with a blowdown valve.
[0011] Preferably, the water removal unit further comprises a pre-cooling device arranged in front of the first heat exchanger, wherein the pre-cooling device comprises a water cooler, the first passage inlet of the water cooler is connected with the krypton-xenon raw gas pipe, the first passage outlet of the water cooler is connected with the first passage of the first heat exchanger, the second passage inlet of the water cooler is connected with the circulating water supply pipe, and the second passage outlet of the water cooler is connected with the circulating water return pipe.
[0012] Preferably, a third three-way pipe is arranged at the first passage inlet of the water cooler, a fourth three-way pipe is arranged at the first passage outlet of the water cooler, and a water cooling bypass pipe with a first regulating valve is arranged between the third end of the third three-way pipe and the third end of the fourth three-way pipe.
[0013] Preferably, a pressure sensor, a fifth three-way pipe and a second regulating valve are arranged in sequence between the fourth three-way pipe and the first passage of the first heat exchanger, a sixth three-way pipe is arranged between the first passage of the first heat exchanger and the adsorber, and a bypass pipe with a third regulating valve is arranged between the third end of the fifth three-way pipe and the third end of the sixth three-way pipe.
[0014] The nitrogen gas recycling device of a krypton-xenon refining system prepared according to the above scheme can heat the raw material in the second heat exchanger by using nitrogen gas from the condenser, so that the raw material gas can meet the operation condition of the light removal rectifying tower, and the nitrogen gas can be reheated, thereby reducing the energy consumption in the subsequent reheating process; further, the raw material gas in the first heat exchanger is heated and cooled by using the heated nitrogen gas, so that the nitrogen gas can be further reheated, the temperature of the raw material gas can be reduced, and the use of circulating water can be saved; the nitrogen gas is temporarily stored by using the regenerating gas buffer tank of the adsorber while the cold energy of the nitrogen gas is utilized, so that the nitrogen gas can be used as regenerating gas when the adsorber is regenerated, and the nitrogen gas itself can be utilized; further, in order to prevent the freezing and blocking phenomenon in the first channel of the first heat exchanger, the water cooler, the pressure sensor and the bypass pipeline with the third regulating valve are arranged, so that the utility model can normally operate when the freezing and blocking phenomenon occurs; the utility model has the advantages of simple structure, reasonable design, and long-time stable operation of the krypton-xenon refining system while the cold energy of the nitrogen gas and the nitrogen gas itself are effectively utilized. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 It is a structural schematic view of the utility model.
[0016] In the drawing:
[0017] 1, krypton-xenon raw material gas pipeline; 2, krypton-xenon separation tower; 3, light removal rectifying tower; 4, condenser; 5, first heat exchanger; 6, adsorber; 7, second heat exchanger; 8, liquid nitrogen storage tank; 9, adsorber regenerating gas buffer tank; 10, heating furnace; 11, blowdown pipeline; 12, water cooler; 13, circulating water pipeline; 14, circulating backwater pipeline; 15, flow regulating valve; 16, first regulating valve; 17, third three-way; 18, fourth three-way; 19, pressure sensor; 20, fifth three-way; 21, second regulating valve; 22, sixth three-way; 23, third regulating valve; 24, liquid oxygen storage tank; 25, blowdown valve; 26, first three-way; 27, second three-way. DETAILED DESCRIPTION
[0018] The technical scheme in the embodiments of the utility model will be clearly and completely described below by combining the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.
[0019] In the description of the utility model, it is understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.
[0020] Referring to Figure 1 The utility model discloses a kind of nitrogen recovery and utilization device in krypton-xenon refining system, including krypton-xenon raw gas pipeline 1, krypton-xenon raw gas pipeline 1 is connected with the light removal rectification part by water removal unit, the tower kettle liquid outlet pipeline of light removal rectification part is connected with the krypton-xenon separation tower 2 of subsequent krypton-xenon purification section, the light removal rectification part includes light removal rectification tower 3, the gas phase outlet of the top of light removal rectification tower 3 is connected with the tube side of condenser 4, the tube side outlet of condenser 4 is connected with the reflux liquid inlet of light removal rectification tower 3 and liquid oxygen storage tank 24 respectively;Water removal unit at least includes the first pass of first heat exchanger 5 connected with krypton-xenon raw gas pipeline 1, the first pass of first heat exchanger 5 is connected with the first pass of second heat exchanger 7 and light removal rectification tower 3 by adsorber 6;Liquid nitrogen storage tank 8 is connected with adsorber with regenerating gas buffer tank 9 by the shell side of condenser 4 and the second pass of second heat exchanger 7, the outlet of adsorber with regenerating gas buffer tank 9 is connected with adsorber 6.The utility model utilizes the cold quantity in nitrogen gas from condenser 4 shell side vaporization after heat exchange with raw gas in second heat exchanger 7, to realize the need of raw gas cooling to meet the working condition of light removal rectification tower 3, nitrogen is reheated simultaneously, to realize as the regenerating gas of adsorber 6 while reducing energy consumption;The above-mentioned can avoid the loss of cold quantity and nitrogen energy caused by nitrogen venting in traditional technology.
[0021] Further, the second pass of second heat exchanger 7 is connected with the second pass of first heat exchanger 5, the outlet of the second pass of first heat exchanger 5 is connected with adsorber with regenerating gas buffer tank 9.By the above-mentioned setting, raw gas can be cooled on the basis of saving circulating water, and further reheating of nitrogen is realized;So as to achieve the purpose of making full use of nitrogen cold quantity.
[0022] Further, the second pass of second heat exchanger 7 is connected with the second pass of first heat exchanger 5, the outlet of the second pass of first heat exchanger 5 is connected with adsorber with regenerating gas buffer tank 9.By the above-mentioned setting, raw gas can be cooled on the basis of saving circulating water, and further reheating of nitrogen is realized;So as to achieve the purpose of making full use of nitrogen cold quantity.
[0022] Further, the second pass of second heat exchanger 7 is connected with the second pass of first heat exchanger 5, the outlet of the second pass of first heat exchanger 5 is connected with adsorber with regenerating gas buffer tank 9.Between the second pass of first heat exchanger 5 and adsorber with regenerating gas buffer tank 9, first three-way pipe 26 and second three-way pipe 27 are arranged, and near path pipeline with flow regulating valve 15 is arranged between first three-way pipe 26 and second three-way pipe 27.Because the temperature of nitrogen is relatively low, to avoid the freezing plugging in the first pass of first heat exchanger 5;The flow of nitrogen can be adjusted by setting near path pipeline with flow regulating valve 15, to ensure long-term stable operation of the whole system.
[0023] Further, the second three-way valve 27 and the adsorber regeneration gas buffer tank 9 are provided with a heating furnace 10. By providing the heating furnace 10, the nitrogen gas subjected to multiple reheats can be heated to meet the characteristics of the nitrogen gas used as the adsorber regeneration gas, and the use temperature of the nitrogen gas can be used according to the use temperature of the nitrogen gas.
[0024] Further, the first passage of the first heat exchanger 5 is provided with a blowdown port connected with a blowdown pipeline 11 provided with a blowdown valve 25. By providing the blowdown pipeline 11 provided with the blowdown valve 25, the water produced by cooling can be discharged in time to prevent freezing and to reduce the operating load of the adsorber 6.
[0025] Further, the water removal unit further comprises a pre-cooling device arranged at the front of the first heat exchanger 5. The pre-cooling device comprises a water cooler 12, the first passage inlet of the water cooler 12 is connected with the krypton-xenon raw material gas pipeline 1, and the first passage outlet of the water cooler 12 is connected with the first passage of the first heat exchanger 5. The second passage inlet of the water cooler 12 is connected with the circulating water supply pipeline 13, and the second passage outlet of the water cooler 12 is connected with the circulating water return pipeline 14. By providing the water cooler 12, the first heat exchanger 5 can be replaced. When the first heat exchanger 5 needs to be maintained, the raw material gas can be cooled by the water cooler 12 to realize stable operation of the system.
[0026] Further, the first passage inlet of the water cooler 12 is provided with a third three-way valve 17, the first passage outlet of the water cooler 12 is provided with a fourth three-way valve 18, and a water cooling bypass pipeline provided with a first regulating valve 16 is arranged between the third end of the third three-way valve 17 and the third end of the fourth three-way valve 18. When the first heat exchanger 5 is normally operated, the first regulating valve 16 is opened to make the raw material gas bypass the water cooler 12 and directly enter the first heat exchanger 5 for cooling.
[0027] Further, the fourth three-way valve 18 and the first passage of the first heat exchanger 5 are sequentially provided with a pressure sensor 19, a fifth three-way valve 20, and a second regulating valve 21, the first passage of the first heat exchanger 5 and the adsorber 6 are provided with a sixth three-way valve 22, and a bypass pipeline provided with a third regulating valve 23 is arranged between the third end of the fifth three-way valve 20 and the third end of the sixth three-way valve 22. The pressure sensor 19 is arranged to monitor the pressure in the pipeline in real time. When the first passage of the first heat exchanger 5 is frozen, the pressure sensor 19 will show that the pressure is rising. When the above-mentioned situation occurs, the first regulating valve 16 is closed, and the third regulating valve 23 is opened to make the raw material gas cooled by the water cooler 12 directly enter the adsorber 6, thereby ensuring stable operation of the entire krypton-xenon refining system.
[0028] The working principle of the utility model is: the krypton-xenon raw material gas in the krypton-xenon raw material gas pipeline 1 in the utility model refers to the krypton-xenon gas after removing methane, which is cooled through the first channel of the first heat exchanger 5 under normal circumstances, the cooled raw material gas is adsorbed with moisture and impurities in the adsorber 6, and then enters the first channel of the second heat exchanger 7 to be cooled by heat exchange, and then enters the light-removing rectifying tower 3 to be rectified, the tower kettle liquid after rectification enters the krypton-xenon separation tower 2 to be followed up; the gas phase after rectification enters the condenser 4 to be condensed into liquid phase, part of the liquid phase is returned to the light-removing rectifying tower 3 as reflux liquid, and the other part of the liquid phase enters the liquid oxygen storage tank 24 to be sold; in the above process, the liquid nitrogen in the liquid nitrogen storage tank 8 enters the condenser 4 to condense the gas phase from the light-removing rectifying tower 3, the liquid nitrogen after heat exchange through the condenser 4 becomes nitrogen gas with a temperature of about-176 DEG C, the nitrogen gas enters the second channel of the second heat exchanger 7 to be heat exchanged, and the temperature is-129 DEG C, and finally the nitrogen gas is heat exchanged through the second channel of the first heat exchanger 5 and enters the heating furnace, the reheated nitrogen gas enters the adsorber regeneration gas buffer tank 9 to be used as adsorber regeneration gas; the pressure sensor 19 in the foregoing operation process monitors the pressure in the pipeline in real time, when the first channel of the first heat exchanger 5 is frozen and blocked, the pressure sensor 19 will show that the pressure rises, when the above situation occurs, the first regulating valve 16 is closed, the third regulating valve 23 is opened, the raw material gas is cooled through the water cooler 12 and then directly enters the adsorber 6, so that the stable operation of the entire krypton-xenon refining system is ensured.
[0029] The above is only the preferred specific implementation of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.
Claims
1. A nitrogen recovery and utilization device in a krypton-xenon refining system, comprising a krypton-xenon feed gas pipeline (1), the krypton-xenon feed gas pipeline (1) being connected to a light-light distillation section via a moisture removal unit, and the bottom liquid outlet pipeline of the light-light distillation section being connected to a krypton-xenon separation tower (2) in the subsequent krypton-xenon purification section, characterized in that, The light-removal distillation section includes a light-removal distillation column (3), the gas phase outlet at the top of the light-removal distillation column (3) is connected to the tube side of the condenser (4), and the tube side outlet of the condenser (4) is connected to the reflux liquid inlet of the light-removal distillation column (3) and the liquid oxygen storage tank (24), respectively. The moisture removal unit includes at least a first channel of a first heat exchanger (5) connected to a krypton-xenon feed gas pipeline (1), and the first channel of the first heat exchanger (5) is connected to the first channel of a second heat exchanger (7) and a light distillation column (3) via an adsorber (6). The liquid nitrogen storage tank (8) is connected to the regeneration gas buffer tank (9) of the adsorber through the shell side of the condenser (4) and the second channel of the second heat exchanger (7). The outlet of the regeneration gas buffer tank (9) of the adsorber is connected to the adsorber (6).
2. The nitrogen recovery and utilization device in a krypton-xenon refining system according to claim 1, characterized in that, The second channel of the second heat exchanger (7) is connected to the second channel of the first heat exchanger (5), and the outlet of the second channel of the first heat exchanger (5) is connected to the regeneration gas buffer tank (9) of the adsorber.
3. The nitrogen recovery and utilization device in a krypton-xenon refining system according to claim 2, characterized in that, A first tee (26) is provided between the second channel of the second heat exchanger (7) and the second channel of the first heat exchanger (5). A second tee (27) is provided between the outlet of the second channel of the first heat exchanger (5) and the regeneration gas buffer tank (9) for the adsorber. A bypass pipe with a flow regulating valve (15) is provided between the first tee (26) and the second tee (27).
4. The nitrogen recovery and utilization device in a krypton-xenon refining system according to claim 3, characterized in that, A heating furnace (10) is provided between the second three-way valve (27) and the regeneration gas buffer tank (9) for the adsorber.
5. The nitrogen recovery and utilization device in a krypton-xenon refining system according to claim 1, characterized in that, The first heat exchanger (5) has a drain port on its first channel that is connected to a drain pipe (11) with a drain valve (25).
6. The nitrogen recovery and utilization device in a krypton-xenon refining system according to claim 1, characterized in that, The moisture removal unit also includes a pre-cooling component disposed in front of the first heat exchanger (5); The precooling component includes a water cooler (12), the first channel inlet of the water cooler (12) is connected to the krypton-xenon raw material gas pipeline (1), the first channel outlet of the water cooler (12) is connected to the first channel of the first heat exchanger (5); the second channel inlet of the water cooler (12) is connected to the circulating water supply pipeline (13), and the second channel outlet of the water cooler (12) is connected to the circulating return water pipeline (14).
7. The nitrogen recovery and utilization device in a krypton-xenon refining system according to claim 6, characterized in that, The water cooler (12) has a third tee (17) at the inlet of the first channel and a fourth tee (18) at the outlet of the first channel. A water cooling bypass pipe with a first regulating valve (16) is provided between the third end of the third tee (17) and the third end of the fourth tee (18).
8. The nitrogen recovery and utilization device in a krypton-xenon refining system according to claim 7, characterized in that, A pressure sensor (19), a fifth three-way valve (20), and a second regulating valve (21) are sequentially provided between the fourth three-way valve (18) and the first channel of the first heat exchanger (5). A sixth three-way valve (22) is provided between the first channel of the first heat exchanger (5) and the adsorber (6). A bypass pipe with a third regulating valve (23) is provided between the third end of the fifth three-way valve (20) and the third end of the sixth three-way valve (22).