NG purification low-abundance carbon 13 stable isotope co-production device

Abstract

The invention discloses an NG (natural gas) purification low-abundance C13 stable isotope co-production device, which belongs to the technical field of isotope co-production and is characterized in that an inlet of a first heat pipe is connected with an NG raw material pipeline; an outlet of the first heat pipe is respectively communicated with a heat release pipeline of the NG purification tower and a heat release pipeline of the NG reboiler, a heat absorption pipeline of the NG reboiler is communicated with the NG purification tower, a heat absorption pipeline of the NG condenser is communicated with the NG purification tower, cooling liquid circulates in a heat release pipeline of the NG condenser, and the heat release pipeline of the NG condenser is communicated with an inlet of the first cold pipe; the 13CH4 rectifying tower is communicated with the NG purifying tower, a heat absorption pipeline of the 13CH4 condenser is communicated with the 13CH4 rectifying tower, cooling liquid circulates in a heat release pipeline of the 13CH4 condenser, the heat release pipeline of the 13CH4 condenser is communicated with an inlet of the first cooling pipe, and a pipeline, communicated with an outlet of the first cooling pipe, of a heat release pipeline of the 13CH4 reboiler is connected with a heater. According to the system, LNG is heated through NG, cooling liquid flows through multiple positions to achieve the sufficient refrigeration effect, and therefore the energy utilization rate in the system is increased, and the economical efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of isotope co-production, and in particular to a NG purification low-abundance carbon 13 stable isotope co-production device. Background Art

[0002] 13 C stable isotope is a strategic scarce resource with unique applications in areas such as early cancer detection, MRI, HP detection, etc. However, 13 The production of C stable isotopes is difficult, and the economic consumption in the production process is serious. It is urgent to develop energy-saving isotope deep cold distillation enrichment technology. Therefore, how to provide a method that can reduce economic consumption, improve energy saving effect, make full use of cold sources, and realize NG gas liquefaction, purification and low abundance 13 CH4 stable isotope enrichment device to obtain 13 C stable isotopes is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0003] In view of this, the present invention provides a NG purification low-abundance carbon 13 stable isotope co-production device, which can make full use of cold sources, reduce economic consumption, and improve energy-saving effects.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A NG purification low-abundance carbon 13 stable isotope co-production device, comprising:

[0006] Heat exchanger; the heat exchanger comprises a first cold pipe, a first hot pipe, a second cold pipe, and a second hot pipe, and the first hot pipe inlet of the heat exchanger is connected to the NG raw material pipeline;

[0007] NG purification mechanism, the NG purification system includes an NG purification tower, an NG condenser and an NG reboiler, the first heat pipe outlet of the heat exchanger is respectively connected to the heat release pipes of the NG purification tower and the NG reboiler, the heat absorption pipe of the NG reboiler is connected to the NG purification tower, the heat absorption pipe of the NG condenser is connected to the NG purification tower, the heat release pipe of the NG condenser is internally circulated with coolant, and the heat release pipe of the NG condenser is connected to the first cold pipe inlet of the heat exchanger;

[0008] 13 CH4 distillation mechanism, 13 CH4 distillation mechanism includes 13 CH4 distillation tower, 13 CH4 condenser and 13 CH4 reboiler, the 13 The CH4 distillation tower is connected to the NG purification tower. 13The heat absorption pipeline of the CH4 condenser is connected to the 13 CH4 distillation tower, 13 The heat release pipe of the CH4 condenser is filled with coolant. 13 The heat release pipeline of the CH4 condenser is connected to the first cold pipe inlet of the heat exchanger. 13 The heat release pipeline of the CH4 reboiler is connected to the pipeline of the first cold pipe outlet of the heat exchanger and is connected to a heater.

[0009] Optionally, the heat absorption pipeline inlet of the NG reboiler is connected to the lower end of the NG purification tower, the heat absorption pipeline outlet of the NG reboiler is connected to the side wall of the NG purification tower, the heat release pipeline inlet of the NG reboiler is connected to the first heat pipe outlet of the heat exchanger, the heat release pipeline outlet of the NG reboiler is connected to the second heat pipe inlet of the heat exchanger, and the second heat pipe outlet of the heat exchanger is connected to the NG purification tower.

[0010] Optionally, the 13 The heat absorption pipe inlet of the CH4 reboiler is connected to the 13 The lower end of the CH4 distillation tower, 13 The outlet of the heat absorption pipeline of the CH4 reboiler is connected to the 13 The side wall of the CH4 distillation tower, 13 The heat release pipe inlet of the CH4 reboiler is connected to the first cold pipe outlet of the heat exchanger. 13 The outlet of the heat release pipeline of the CH4 reboiler is connected to the cooling recovery tank.

[0011] Optionally, the inlet of the heat absorption pipeline of the NG condenser is connected to the top of the NG purification tower, the outlet of the heat absorption pipeline of the NG condenser is connected to the side wall of the NG purification tower, one end of the heat release pipeline of the NG condenser is connected to a cooling box containing coolant, and the other end of the heat release pipeline of the NG condenser is connected to the first cold pipe outlet of the heat exchanger.

[0012] Optionally, the 13 The heat absorption pipe inlet of the CH4 condenser is connected to the 13 The top of the CH4 distillation tower, 13 The outlet of the heat absorption pipe of the CH4 condenser is connected to the 13 The side wall of the CH4 distillation tower, 13 One end of the heat release pipe of the CH4 condenser is connected to a cooling box containing coolant. 13 The other end of the heat release pipeline of the CH4 condenser is connected to the first cold pipe outlet of the heat exchanger.

[0013] Optionally, the 13The heat absorption pipeline of the CH4 condenser and the heat absorption pipeline of the NG condenser are both provided with waste gas outlets, and the two waste gas outlets are both connected to the second cold pipe inlet of the heat exchanger, and the second cold pipe outlet of the heat exchanger is connected to the waste gas recovery box.

[0014] Optionally, the first cold pipe, the first hot pipe, the second cold pipe, and the second hot pipe of the heat exchanger are distributed alternately in sequence.

[0015] Optionally, the coolant is liquid nitrogen.

[0016] Optionally, the NG purification tower and the 13 Multiple layers of baffles are arranged in the CH4 distillation tower, and the openings of the baffles are staggered.

[0017] Optionally, the NG purification tower is connected to an LNG storage tank. 13 CH4 distillation tower connection 13 CH4 collection box. The beneficial effects of the present invention are:

[0018] In the present invention, NG flows through the heat release pipeline of the NG reboiler, and LNG flows through the heat absorption pipeline of the NG reboiler, thereby achieving the cooling of NG and the heating of LNG at the same time, thereby improving the economic effect. 13 After the CH4 condenser, it continues to enter the heat exchanger for cooling and heat absorption. After being heated, it flows to 13 The CH4 reboiler performs low temperature distillation, effectively reducing economic consumption and improving energy saving effect. Additional aspects and advantages of the present invention will be partially given in the following description, which will become apparent from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, 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 embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the NG purification low-abundance carbon 13 stable isotope co-production device of the present invention.

[0021] Among them, in the figure:

[0022] 1. Heat exchanger; 11. First cold pipe inlet; 12. First cold pipe outlet; 13. First heat pipe inlet; 14. First heat pipe outlet; 15. Second cold pipe inlet; 16. Second cold pipe outlet; 17. Second heat pipe inlet; 18. Second heat pipe outlet.

[0023] 2. NG purification mechanism; 21. NG purification tower; 22. NG condenser; 23. NG reboiler;

[0024] 3. 13 CH4 distillation mechanism; 31. 13 CH4 distillation tower; 32. 13 CH4 condenser; 33. 13 CH4 reboiler;

[0025] 4. Heater; 5. LNG storage tank; 6. Cooling recovery tank; 7. Waste gas recovery tank. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See attached Figure 1 The present invention discloses a NG purification low-abundance carbon 13 stable isotope co-production device, comprising:

[0028] Heat exchanger 1; the heat exchanger 1 comprises a first cold pipe, a first hot pipe, a second cold pipe, and a second hot pipe, and the first hot pipe inlet 13 of the heat exchanger 1 is connected to the NG raw material pipeline;

[0029] NG purification mechanism 2, the NG purification system includes an NG purification tower 21, an NG condenser 22 and an NG reboiler 23, the first heat pipe outlet 14 of the heat exchanger 1 is respectively connected to the heat release pipelines of the NG purification tower 21 and the NG reboiler 23, the heat absorption pipeline of the NG reboiler 23 is connected to the NG purification tower 21, the heat absorption pipeline of the NG condenser 22 is connected to the NG purification tower 21, the heat release pipeline of the NG condenser 22 is circulated with coolant, and the heat release pipeline of the NG condenser 22 is connected to the first cold pipe inlet 11 of the heat exchanger 1; the NG raw material enters the first heat pipe of the heat exchanger 1 through the NG raw material pipeline for cooling, and the cooled NG flows through the heat release pipeline of the NG reboiler 23, the first heat pipe outlet 14 of the heat exchanger 1 is respectively connected to the heat release pipelines of the NG purification tower 21 and the NG reboiler 23, optionally, the first heat pipe outlet 14 of the heat exchanger 1 is first connected to the NG purification tower 21, and the cooling NG flows through the heat release pipeline of the NG reboiler 23. After entering the NG purification tower 21, the hot NG rises and enters the NG condenser 22 to be cooled to form LNG, which refluxes to the bottom of the NG purification tower 21 until the LNG in the NG purification tower 21 reaches the specified page height. The first heat pipe outlet 14 of the heat exchanger 1 is then connected to the NG reboiler 23, and the LNG flows through the heat absorption pipeline of the NG reboiler 23. The LNG in the heat absorption pipeline exchanges heat with the cooled NG in the heat release pipeline. The LNG is heated to form NG and enters the NG condenser 22 for cooling again. The exhaust gas is purified and separated in multiple changes. After the NG in the NG reboiler 23 is cooled, it enters the heat exchanger 1 through the second cold pipe for secondary cooling, forming new supercooled LNG that enters the NG purification tower 21, achieving balance in the NG purification tower 21, and at the same time achieving cooling of the NG and heating of the LNG, thereby improving energy utilization, reducing external energy demand, and improving economic effects.

[0030] 13 CH4 distillation mechanism 3, 13 CH4 distillation mechanism 3 includes 13 CH4 distillation tower 31, 13 CH4 condenser 32 and 13 CH4 reboiler 33, 13 The CH4 distillation tower 31 is connected to the NG purification tower 21. 13 The heat absorption pipeline of CH4 condenser 32 is connected 13 CH4 distillation tower 31, 13 A coolant flows inside the heat release pipe of the CH4 condenser 32. 13 The heat release pipeline of the CH4 condenser 32 is connected to the first cold pipe inlet 11 of the heat exchanger 1. 13 The heat release pipe of the CH4 reboiler 33 is connected to the first cold pipe outlet 12 of the heat exchanger 1 and is connected to the heater 4; the coolant flows through the NG condenser 22 and 13 After CH4 condenses 32, it continues to enter the heat exchanger 1 for cooling and heat absorption. After being heated by the heater 4, it reaches the specified temperature and flows to 13The CH4 reboiler 33 performs low temperature distillation, which effectively reduces economic consumption and improves energy saving effect.

[0031] In the present embodiment, specifically, the heat absorption pipeline inlet of the NG reboiler 23 is connected to the lower end of the NG purification tower 21, the heat absorption pipeline outlet of the NG reboiler 23 is connected to the side wall of the NG purification tower 21, the heat release pipeline inlet of the NG reboiler 23 is connected to the first heat pipe outlet 14 of the heat exchanger 1, the heat release pipeline outlet of the NG reboiler 23 is connected to the second heat pipe inlet 17 of the heat exchanger 1, and the second heat pipe outlet 18 of the heat exchanger 1 is connected to the NG purification tower 21; the heat absorption pipeline inlet of the NG reboiler 23 is connected to the lower end of the NG purification tower 21, and the heat absorption pipeline outlet of the NG reboiler 23 is connected to the side wall of the NG purification tower 21 to achieve a circulation effect. LNG is collected at the lower end of the NG purification tower 21 under the action of its own gravity, and the NG gas formed after heating returns to the NG purification tower 21 through the side wall of the NG purification tower 21 to go to the NG condenser 22 at the top of the NG purification tower 21 for condensation.

[0032] In this embodiment, specifically, 13 The heat absorption pipeline inlet of CH4 reboiler 33 is connected to 13 The lower end of the CH4 distillation tower 31, 13 The outlet of the heat absorption pipeline of the CH4 reboiler 33 is connected to 13 The side wall of the CH4 distillation tower 31, 13 The heat release pipe inlet of the CH4 reboiler 33 is connected to the first cold pipe outlet 12 of the heat exchanger 1. 13 The outlet of the heat release pipeline of the CH4 reboiler 33 is connected to the cooling recovery box 6; the heat absorption pipeline is connected to the lower end and the side wall respectively to achieve a circulation effect. The heated nitrogen flows in the heat release pipeline. After the nitrogen is heat-exchanged, it enters the cooling recovery box 6 to achieve nitrogen recovery. After the nitrogen is heated by the second cold end, it is heated by the heater 4 and can enter 13 The heat release line of the CH4 reboiler 33 performs cryogenic distillation of the internal LNG to form 13 CH4.

[0033] In this embodiment, specifically, the inlet of the heat absorption pipeline of the NG condenser 22 is connected to the top of the NG purification tower 21, the outlet of the heat absorption pipeline of the NG condenser 22 is connected to the side wall of the NG purification tower 21, one end of the heat release pipeline of the NG condenser 22 is connected to a cooling box containing coolant, and the other end of the heat release pipeline of the NG condenser 22 is connected to the first cold pipe outlet 12 of the heat exchanger 1.

[0034] In this embodiment, specifically, 13 The heat absorption pipeline inlet of the CH4 condenser 32 is connected to 13 At the top of the CH4 distillation tower 31, 13 The heat absorption pipeline outlet of the CH4 condenser 32 is connected to13 The side wall of the CH4 distillation tower 31, 13 One end of the heat release pipe of the CH4 condenser 32 is connected to a cooling box containing coolant. 13 The other end of the heat release pipe of the CH4 condenser 32 is connected to the first cooling pipe outlet 12 of the heat exchanger 1; optionally, the cooling liquid is cold nitrogen. 13 After CH4 condenses 32, it continues to enter the heat exchanger 1 for cooling and heat absorption, and then is heated by the heater 4 to reach the specified temperature and flows to 13 The CH4 reboiler 33 performs low temperature distillation, which effectively reduces economic consumption and improves energy saving effect.

[0035] In this embodiment, specifically, 13 The heat absorption pipeline of the CH4 condenser 32 and the heat absorption pipeline of the NG condenser 22 are both provided with exhaust gas outlets, and the two exhaust gas outlets are connected to the second cold pipe inlet 15 of the heat exchanger 1, and the second cold pipe outlet 16 of the heat exchanger 1 is connected to the exhaust gas recovery box 7; after the exhaust gas passes through the heat exchanger 1 for heat exchange, it is collected, which can further improve the utilization rate of energy.

[0036] In this embodiment, specifically, the first cold pipe, the first hot pipe, the second cold pipe and the second hot pipe of the heat exchanger 1 are staggered in sequence; the staggered distribution makes the heat transfer of the first cold pipe, the first hot pipe, the second cold pipe and the second hot pipe more balanced, the temperature difference between the first cold pipe and the first hot pipe is the largest, and the heat exchange effect is the best; optionally, the first cold pipe, the first hot pipe, the second cold pipe and the second heat pipe are spirally staggered to further improve the temperature transfer effect.

[0037] In this embodiment, the cooling liquid is liquid nitrogen. The cold nitrogen has a low temperature and a good liquefaction effect on the NG gas. The endothermic nitrogen produced is an inert gas, which can avoid the reaction causing recovery difficulties and avoid air pollution.

[0038] In this embodiment, specifically, the NG purification tower 21 and 13 The CH4 distillation tower 31 is provided with multiple layers of baffles, and the openings of the baffles are staggered; the baffles with staggered openings can increase the contact area between the condensed and descending LNG and NG, utilize the condensed and descending LNG and NG for heat exchange, and improve energy utilization.

[0039] In this embodiment, specifically, the NG purification tower 21 is connected to the LNG storage tank 5. 13 CH4 distillation tower 31 is connected 13 CH4 collection box. Part of the LNG produced in the NG purification tower 21 enters the LNG storage tank 5 and the other part enters 13 CH4 distillation tower 31 is used as raw material, 13The product after distillation in CH4 distillation tower 31 enters 13 CH4 collection box implementation 13 Collection of CH4.

[0040] In the present invention, NG flows through the heat release pipeline of the NG reboiler, and LNG flows through the heat absorption pipeline of the NG reboiler, thereby achieving the cooling of NG and the heating of LNG at the same time, thereby improving the economic effect. 13 After the CH4 condenser, it continues to enter the heat exchanger for cooling and heat absorption. After being heated, it flows to 13 The CH4 reboiler performs low temperature distillation. The present invention makes full use of the cold source so that the energy can be recycled to achieve liquefaction, purification and low abundance of NG gas. 13 While enriching CH4 stable isotopes, it effectively improves energy-saving effects, reduces external energy requirements, and improves the efficiency of obtaining 13C stable isotopes.

[0041] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to the embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A NG purification low-abundance carbon 13 stable isotope co-production device, characterized in that: include: Heat exchanger; the heat exchanger comprises a first cold pipe, a first hot pipe, a second cold pipe, and a second hot pipe, and the first hot pipe inlet of the heat exchanger is connected to the NG raw material pipeline; NG purification mechanism, the NG purification system includes an NG purification tower, an NG condenser and an NG reboiler, the first heat pipe outlet of the heat exchanger is respectively connected to the heat release pipes of the NG purification tower and the NG reboiler, the heat absorption pipe of the NG reboiler is connected to the NG purification tower, the heat absorption pipe of the NG condenser is connected to the NG purification tower, the heat release pipe of the NG condenser is internally circulated with coolant, and the heat release pipe of the NG condenser is connected to the first cold pipe inlet of the heat exchanger; 13 CH4 distillation mechanism, 13 CH4 distillation mechanism includes 13 CH4 distillation tower, 13 CH4 condenser and 13 CH4 reboiler, the 13 The CH4 distillation tower is connected to the NG purification tower. 13 The heat absorption pipeline of the CH4 condenser is connected to the 13 CH4 distillation tower, 13 The heat release pipe of the CH4 condenser is filled with coolant. 13 The heat release pipeline of the CH4 condenser is connected to the first cold pipe inlet of the heat exchanger. 13 The heat release pipeline of the CH4 reboiler is connected to the pipeline of the first cold pipe outlet of the heat exchanger and is connected to a heater.

2. The NG purification low-abundance carbon 13 stable isotope co-production device according to claim 1, characterized in that: The heat absorption pipeline inlet of the NG reboiler is connected to the lower end of the NG purification tower, the heat absorption pipeline outlet of the NG reboiler is connected to the side wall of the NG purification tower, the heat release pipeline inlet of the NG reboiler is connected to the first heat pipe outlet of the heat exchanger, the heat release pipeline outlet of the NG reboiler is connected to the second heat pipe inlet of the heat exchanger, and the second heat pipe outlet of the heat exchanger is connected to the NG purification tower.

3. The NG purification low-abundance carbon 13 stable isotope co-production device according to claim 1, characterized in that: Said 13 The heat absorption pipe inlet of the CH4 reboiler is connected to the 13 The lower end of the CH4 distillation tower, 13 The outlet of the heat absorption pipeline of the CH4 reboiler is connected to the 13 The side wall of the CH4 distillation tower, 13 The heat release pipe inlet of the CH4 reboiler is connected to the first cold pipe outlet of the heat exchanger. 13 The outlet of the heat release pipeline of the CH4 reboiler is connected to the cooling recovery tank.

4. The NG purification low-abundance carbon 13 stable isotope co-production device according to claim 1, characterized in that: The inlet of the heat absorption pipeline of the NG condenser is connected to the top of the NG purification tower, the outlet of the heat absorption pipeline of the NG condenser is connected to the side wall of the NG purification tower, one end of the heat release pipeline of the NG condenser is connected to a cooling box containing coolant, and the other end of the heat release pipeline of the NG condenser is connected to the first cold pipe outlet of the heat exchanger.

5. The NG purification low-abundance carbon 13 stable isotope co-production device according to claim 1, characterized in that: Said 13 The heat absorption pipe inlet of the CH4 condenser is connected to the 13 The top of the CH4 distillation tower, 13 The outlet of the heat absorption pipe of the CH4 condenser is connected to the 13 The side wall of the CH4 distillation tower, 13 One end of the heat release pipe of the CH4 condenser is connected to a cooling box containing coolant. 13 The other end of the heat release pipeline of the CH4 condenser is connected to the first cold pipe outlet of the heat exchanger.

6. The NG purification low-abundance carbon 13 stable isotope co-production device according to claim 1, characterized in that: Said 13 The heat absorption pipeline of the CH4 condenser and the heat absorption pipeline of the NG condenser are both provided with waste gas outlets, and the two waste gas outlets are both connected to the second cold pipe inlet of the heat exchanger, and the second cold pipe outlet of the heat exchanger is connected to the waste gas recovery box.

7. The NG purification low-abundance carbon 13 stable isotope co-production device according to claim 6, characterized in that: The first cold pipe, the first hot pipe, the second cold pipe and the second hot pipe of the heat exchanger are arranged alternately in sequence.

8. The NG purification low-abundance carbon 13 stable isotope co-production device according to claim 1, characterized in that: The cooling liquid is liquid nitrogen.

9. The NG purification low-abundance carbon 13 stable isotope co-production device according to claim 1, characterized in that: The NG purification tower and the 13 Multiple layers of baffles are arranged in the CH4 distillation tower, and the openings of the baffles are staggered.

10. The NG purification low-abundance carbon 13 stable isotope co-production device according to claim 1, characterized in that: The NG purification tower is connected to the LNG storage tank. 13 CH4 distillation tower connection 13 CH4 collection box.

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