Zero-loss nitrogen purification device

Abstract

The utility model discloses a zero-loss nitrogen purification device which comprises a premixing tank, a deaerator, a cooler, a vapor-liquid separator and a dryer group which are sequentially communicated according to a gas flowing sequence, a gas inlet of the premixing tank is provided with a mixed gas pipe, and a gas outlet of the vapor-liquid separator is communicated with the dryer group through a first gas pipe with a first valve. A gas outlet of the dryer set is communicated with a nitrogen outlet pipe, the dryer set comprises a first dryer and a second dryer which are arranged in parallel, a regeneration gas pipe is arranged at a gas outlet of the vapor-liquid separator, and a hot blowing regeneration pipe and a cold blowing regeneration pipe are arranged at the tail end of the regeneration gas pipe; the hot blowing regeneration pipe is sequentially connected with the preheating mechanism, the dryer group, the post-cooling mechanism and the first gas pipe according to a gas flowing sequence, and the cold blowing regeneration pipe is sequentially connected with the dryer group, the preheating mechanism, the post-cooling mechanism and the first gas pipe according to a gas flowing sequence. According to the utility model, zero loss of regenerated gas of the dryer in the nitrogen purification process can be realized.

Description

Technical Field

[0001] The utility model relates to a nitrogen purification device, in particular to a zero-loss nitrogen purification device. Background Art

[0002] The nitrogen purification device uses physical or chemical methods to remove impurities in nitrogen. Industrially, the main impurity removed from nitrogen is oxygen to improve the purity of nitrogen. Conventional nitrogen purification devices generally use two drying towers for dehydration, and 10% of the gas volume of the raw material gas needs to be consumed as the regeneration gas during dehydration. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a zero-loss nitrogen purification device to overcome the deficiencies of the prior art and solve the problem that 10% of the gas volume of the raw material gas needs to be consumed as the regeneration gas during dehydration.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is: a zero-loss nitrogen purification device, which includes a premixing tank, a deoxidizer, a cooler, a vapor-liquid separator, and a dryer group connected in sequence according to the gas flow sequence. A mixing gas pipe is provided at the inlet of the premixing tank. The outlet of the vapor-liquid separator is connected to the dryer group through a first gas pipe. A nitrogen gas outlet pipe is connected to the outlet of the dryer group. A first valve is provided on the first gas pipe. The dryer group includes a first dryer and a second dryer arranged in parallel. It also includes a post-cooling mechanism and a preheating mechanism. A regeneration gas pipe is provided at the outlet of the vapor-liquid separator. A regeneration flow ratio valve and a second valve are arranged in parallel on the regeneration gas pipe. The end of the regeneration gas pipe is provided with a hot-blow regeneration pipe and a cold-blow regeneration pipe. The hot-blow regeneration pipe is connected to the preheating mechanism, the dryer group, the post-cooling mechanism, and the first gas pipe in sequence according to the gas flow sequence. The hot-blow regeneration gas enters from the outlet of the drying group and flows out from the inlet and enters the post-cooling mechanism. The cold-blow regeneration pipe is connected to the dryer group, the preheating mechanism, the post-cooling mechanism, and the first gas pipe in sequence according to the gas flow sequence. The cold-blow regeneration gas enters from the inlet of the drying group and flows out from the outlet and enters the post-cooling mechanism.

[0005] Further, a second gas pipe is provided between the inlet of the first dryer and the inlet of the second dryer. A fifth valve close to the first dryer and a sixth valve close to the second dryer are provided on the second gas pipe. The end of the first gas pipe is connected to the second gas pipe and is arranged between the fifth valve and the sixth valve. A fifth gas pipe is provided between the outlet of the first dryer and the outlet of the second dryer. A twelfth valve close to the first dryer and a thirteenth valve close to the second dryer are provided on the fifth gas pipe. The nitrogen gas outlet pipe is arranged on the fifth gas pipe between the twelfth valve and the thirteenth valve.

[0006] Further, a third air pipe connected in parallel with the second air pipe is provided between the air inlet of the first dryer and the air inlet of the second dryer. A seventh valve close to the first dryer and an eighth valve close to the second dryer are provided on the third air pipe. A fourth air pipe is provided between the seventh valve and the eighth valve on the third air pipe. A sixth air pipe connected in parallel with the fifth air pipe is further provided between the air outlet of the first dryer and the air outlet of the second dryer. A tenth valve close to the first dryer and an eleventh valve close to the second dryer are provided on the sixth air pipe.

[0007] Further, the post-cooling mechanism includes a post-cooler and a post-vapor-liquid separator communicated with the air outlet of the post-cooler. A post-cooling pipe is provided at the air inlet of the post-cooler and communicated therewith. A ninth air pipe communicated with the first air pipe is provided at the air outlet of the post-vapor-liquid separator.

[0008] Further, the preheating mechanism includes a pre-heater and a pre-dryer connected in series and communicated. An eighth air pipe is provided at the air inlet of the pre-dryer. A seventh air pipe communicated with the pre-heater is provided between the tenth valve and the eleventh valve on the sixth air pipe. The hot blow regeneration pipe includes a first hot blow air pipe with a fourth valve provided at the end of the regeneration air pipe. The first hot blow air pipe is communicated with the eighth air pipe. A second hot blow air pipe with a ninth valve is provided on the fourth air pipe. The end of the second hot blow air pipe is communicated with the post-cooling pipe.

[0009] Further, the cold blow regeneration pipe includes a first cold blow air pipe with a third valve provided at the end of the regeneration air pipe. The end of the first cold blow air pipe is communicated with the fourth air pipe. A second cold blow air pipe with a fourteenth valve is provided at the end of the eighth air pipe. The end of the second cold blow air pipe is communicated with the post-cooling pipe.

[0010] Further, the seventh valve, the eighth valve, the tenth valve, and the eleventh valve are two-way valves.

[0011] Further, a hydrogen content detector, an oxygen content detector, a dew point monitor, and a pressure detector are provided on the nitrogen outlet pipe.

[0012] The beneficial effects of the present utility model adopting the above structure are as follows: A zero-loss nitrogen purification device provided by the present utility model is provided with a post-cooling mechanism and a preheating mechanism. After the regeneration gas performs cold blowing or hot blowing on the dryer group, it is cooled by the post-cooling mechanism and then flows back into the first air pipe and enters the drying group again for drying, and then flows into the next system from the nitrogen outlet pipe, which can realize the regeneration cycle process of the dryer without consuming the regeneration gas volume during the nitrogen purification process. Description of the Drawings

[0013] The technical solution of the present utility model will be further described below in conjunction with the drawings:

[0014] Figure 1 This is a schematic structural diagram of a zero-loss nitrogen purification device according to the present utility model.

[0015] Wherein: 1. Premixing tank; 2. Deoxidizer; 3. Cooler; 4. Vapor-liquid separator; 5. Mixing gas pipe; 6. First gas pipe; 7. Nitrogen outlet pipe; 8. First valve; 9. First dryer; 10. Second dryer; 11. Regeneration gas pipe; 12. Regeneration flow ratio valve; 13. Second valve; 14. Second gas pipe; 15. Fifth valve; 16. Sixth valve; 17. Fifth gas pipe; 18. Twelfth valve; 19. Thirteenth valve; 20. Third gas pipe; 21. Seventh valve; 22. Eighth valve; 23. Fourth gas pipe; 24. Sixth gas pipe; 25. Tenth valve; 26. Eleventh valve; 27. After-cooler; 28. After-vapor-liquid separator; 29. After-cooling pipe; 30. Ninth gas pipe; 31. Pre-heater; 32. Pre-dryer; 33. Eighth gas pipe; 34. Seventh gas pipe; 35. Fourth valve; 36. First hot blow gas pipe; 37. Ninth valve; 38. Second hot blow gas pipe; 39. Third valve; 40. First cold blow gas pipe; 41. Fourteenth valve; 42. Second cold blow gas pipe; 43. Hydrogen content detector; 44. Oxygen content detector; 45. Dew point monitor; 46. Pressure detector. Specific embodiments

[0016] In order to enable those skilled in the art of the present technology to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of this application.

[0017] The designer of the present utility model innovatively proposed a zero-loss nitrogen purification device in response to the requirements of the nitrogen purification device, which can dry the regenerator without consuming regeneration gas during the nitrogen purification process.

[0018] Such as Figure 1As shown in the figure, a zero-loss nitrogen purification device includes a premixing tank 1, a deoxidizer 2, a cooler 3, a vapor-liquid separator 4, and a dryer group that are connected in sequence according to the gas flow sequence. A mixing gas pipe 5 is provided at the inlet of the premixing tank 1. The outlet of the vapor-liquid separator 4 is connected to the dryer group through a first gas pipe 6. A nitrogen outlet pipe 7 is connected to the outlet of the dryer group. A first valve 8 is provided on the first gas pipe 6. The dryer group includes a first dryer 9 and a second dryer 10 arranged in parallel. It also includes a post-cooling mechanism and a preheating mechanism. A regeneration gas pipe 11 is provided at the outlet of the vapor-liquid separator 4. A regeneration flow ratio valve 12 and a second valve 13 are arranged in parallel on the regeneration gas pipe 11. The end of the regeneration gas pipe 11 is provided with a hot-blow regeneration pipe and a cold-blow regeneration pipe. The hot-blow regeneration pipe is connected to the preheating mechanism, the dryer group, the post-cooling mechanism, and the first gas pipe 6 in sequence according to the gas flow sequence. The hot-blow regeneration gas enters from the outlet of the drying group and flows out from the inlet and enters the post-cooling mechanism. The cold-blow regeneration pipe is connected to the dryer group, the preheating mechanism, the post-cooling mechanism, and the first gas pipe 6 in sequence according to the gas flow sequence. The cold-blow regeneration gas enters from the inlet of the drying group and flows out from the outlet and enters the post-cooling mechanism.

[0019] A second gas pipe 14 is provided between the inlet of the first dryer 9 and the inlet of the second dryer 10. A fifth valve 15 close to the first dryer 9 and a sixth valve 16 close to the second dryer 10 are provided on the second gas pipe 14. The end of the first gas pipe 6 is connected to the second gas pipe 14 and is arranged between the fifth valve 15 and the sixth valve 16. A fifth gas pipe 17 is provided between the outlet of the first dryer 9 and the outlet of the second dryer 10. A twelfth valve 18 close to the first dryer 9 and a thirteenth valve 19 close to the second dryer 10 are provided on the fifth gas pipe 17. The nitrogen outlet pipe 7 is arranged on the fifth gas pipe 17 between the twelfth valve and the thirteenth valve 19.

[0020] A third gas pipe 20 arranged in parallel with the second gas pipe 14 is also provided between the inlet of the first dryer 9 and the inlet of the second dryer 10. A seventh valve 21 close to the first dryer 9 and an eighth valve 22 close to the second dryer 10 are provided on the third gas pipe 20. A fourth gas pipe 23 is provided between the seventh valve 21 and the eighth valve 22 on the third gas pipe 20. A sixth gas pipe 24 arranged in parallel with the fifth gas pipe 17 is also provided between the outlet of the first dryer 9 and the outlet of the second dryer 10. A tenth valve 25 close to the first dryer 9 and an eleventh valve 26 close to the second dryer 10 are provided on the sixth gas pipe 24.

[0021] The post-cooling mechanism includes a post-cooler 27 and a post-vapor-liquid separator 28 communicated with the air outlet of the post-cooler 27. The air inlet of the post-cooler 27 is provided with a post-cooling pipe 29 communicated therewith. The air outlet of the post-vapor-liquid separator 28 is provided with a ninth air pipe 30 communicated with the first air pipe 6.

[0022] The preheating mechanism includes a pre-heater 31 and a pre-dryer 32 connected in series and communicated. The air inlet of the pre-dryer 32 is provided with an eighth air pipe 33. A seventh air pipe 34 communicated with the pre-heater 31 is provided between the tenth valve 25 and the eleventh valve 26 on the sixth air pipe 24. The hot blow regeneration pipe includes a first hot blow air pipe 36 provided with a fourth valve 35 at the end of the regeneration air pipe 11. The first hot blow air pipe 36 is communicated with the eighth air pipe 33. A second hot blow air pipe 38 provided with a ninth valve 37 is provided on the fourth air pipe 23. The end of the second hot blow air pipe 38 is communicated with the post-cooling pipe 29.

[0023] The cold blow regeneration pipe includes a first cold blow air pipe 40 provided with a third valve 39 at the end of the regeneration air pipe 11. The end of the first cold blow air pipe 40 is communicated with the fourth air pipe 23. The end of the eighth air pipe 33 is provided with a second cold blow air pipe 42 provided with a fourteenth valve 41. The end of the second cold blow air pipe 42 is communicated with the post-cooling pipe 29.

[0024] The seventh valve 21, the eighth valve 22, the tenth valve 25 and the eleventh valve 26 are two-way valves.

[0025] The nitrogen outlet pipe 7 is provided with a hydrogen content detector 43, an oxygen content detector 44, a dew point monitor 45 and a pressure detector 46.

[0026] During operation, raw material general nitrogen and hydrogen enter the premixing tank 1 through the mixing air pipe 5. After mixing, they enter the deaerator 2. Oxygen in the general nitrogen reacts with hydrogen to produce water, and then enters the cooler 3 for cooling, enters the vapor-liquid separator 4 to separate the moisture of nitrogen. Then the main process nitrogen enters the second air pipe 14 through the first air pipe 6, and enters the corresponding first dryer 9 or second dryer 10 for deep dehydration through the fifth valve 15 or the sixth valve 16. After dehydration, it enters the fifth air pipe 17 from the first dryer 9 or the second dryer 10, and enters the nitrogen outlet pipe 7 through the twelfth valve 18 or the thirteenth valve 19. At the same time, after being detected by the hydrogen content detector 43, the oxygen content detector 44, the dew point monitor 45 and the pressure detector 46 on the nitrogen outlet pipe 7, the pure nitrogen is sent into the subsequent system.

[0027] Regenerative drying tower hot blow process: After the gas-liquid separator 4 separates the moisture from the nitrogen, a part of the nitrogen enters the regeneration gas pipe 11. The regeneration flow rate is adjusted to 20-30% of the total flow rate by the regeneration flow rate proportional valve 12, and then enters the first hot blow gas pipe 36. It enters the pre-dryer 32 through the eighth gas pipe 33 to adsorb the moisture in the nitrogen, and then is heated to 150 degrees through the pre-heater 31. Through the seventh gas pipe 34, it enters the sixth gas pipe 24 and enters the corresponding first dryer 9 or second dryer 10 waiting for regeneration through the tenth valve 25 or the eleventh valve 26 for hot blowing. After hot blowing, the nitrogen enters the third gas pipe 20 from the first dryer 9 or the second dryer 10, enters the fourth gas pipe 23 through the seventh valve 21 or the eighth valve 22, enters the second hot blow gas pipe 38 through the ninth valve 37, and then enters the after-cooler 27 for cooling through the after-cooling pipe 29. After cooling, it enters the post gas-liquid separator 28 to separate the moisture. The nitrogen after separating the moisture returns to the first gas pipe 6 through the ninth gas pipe 30, follows the main process nitrogen into the working first dryer 9 or second dryer 10 for dehydration, and then is sent to the subsequent system to realize the regenerative cycle process.

[0028] Regenerative drying tower cold blow process: After the gas-liquid separator 4 separates the moisture from the nitrogen, a part of the nitrogen enters the regeneration gas pipe 11. The regeneration flow rate is adjusted to 20-30% of the total flow rate by the regeneration flow rate proportional valve 12, and then enters the first cold blow gas pipe 40. After passing through the third valve 39 and entering the fourth gas pipe 23, it enters the first dryer 9 or the second dryer 10 after the above hot blowing and blows cold on it. The nitrogen after cold blowing enters the sixth gas pipe 24 through the tenth valve 25 or the eleventh valve 26, and then enters the pre-heater 31 for heating through the seventh gas pipe 34. The heated nitrogen enters the pre-dryer 32 and hot blows the pre-heater 31. The nitrogen after hot blowing flows through the fourteenth valve 41 through the eighth gas pipe 33 and enters the second cold blow gas pipe 42, and then enters the after-cooler 27 for cooling through the after-cooling pipe 29. After cooling, it enters the post gas-liquid separator 28 to separate the moisture. The nitrogen after separating the moisture returns to the first gas pipe 6 through the ninth gas pipe 30, follows the main process nitrogen into the working first dryer 9 or the second dryer 10 for dehydration, and then is sent to the subsequent system to realize the cold blow of the regenerative drying tower.

[0029] The beneficial effects of the present utility model adopting the above structure are as follows: A zero-loss nitrogen purification device provided by the present utility model is provided with a post-cooling mechanism and a pre-heating mechanism. After the regenerative gas realizes cold blowing or hot blowing on the dryer group, it is cooled by the post-cooling mechanism and then flows back into the first gas pipe and enters the drying group again for drying, and then flows into the next system from the nitrogen outlet pipe, which can realize the regenerative cycle process of the dryer without consuming the regeneration gas volume during the nitrogen purification process.

[0030] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, 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 spirit and scope of the technical solutions of the various embodiments of the present application.

Claims

1. A zero-loss nitrogen purification device, comprising a premixing tank, a deoxidizer, a cooler, a vapor-liquid separator, and a dryer group that are connected in sequence according to the order of gas flow. A mixing gas pipe is provided at the air inlet of the premixing tank. The air outlet of the vapor-liquid separator is connected to the dryer group through a first air pipe. A nitrogen outlet pipe is connected to the air outlet of the dryer group. A first valve is provided on the first air pipe. The dryer group includes a first dryer and a second dryer that are arranged in parallel. It is characterized in that, It also includes a post-cooling mechanism and a preheating mechanism. An after-regeneration gas pipe is provided at the gas outlet of the vapor-liquid separator. A regeneration flow proportional valve and a second valve are connected in parallel on the after-regeneration gas pipe. The end of the after-regeneration gas pipe is provided with a hot-blow regeneration pipe and a cold-blow regeneration pipe. The hot-blow regeneration pipe is sequentially connected to the preheating mechanism, the dryer group, the post-cooling mechanism, and the first gas pipe according to the gas flow sequence. The hot-blow after-regeneration gas enters from the outlet of the drying group and flows out from the inlet and enters the post-cooling mechanism. The cold-blow regeneration pipe is sequentially connected to the dryer group, the preheating mechanism, the post-cooling mechanism, and the first gas pipe according to the gas flow sequence. The cold-blow after-regeneration gas enters from the inlet of the drying group and flows out from the outlet and enters the post-cooling mechanism.

2. The zero-loss nitrogen purification device according to claim 1, wherein: A second gas pipe is provided between the air inlet of the first dryer and the air inlet of the second dryer. A fifth valve close to the first dryer and a sixth valve close to the second dryer are provided on the second gas pipe. The end of the first gas pipe is communicated with the second gas pipe and is arranged between the fifth valve and the sixth valve. A fifth gas pipe is provided between the air outlet of the first dryer and the air outlet of the second dryer. A twelfth valve close to the first dryer and a thirteenth valve close to the second dryer are provided on the fifth gas pipe. The nitrogen outlet pipe is arranged on the fifth gas pipe between the twelfth valve and the thirteenth valve.

3. The zero-loss nitrogen purification device according to claim 2, wherein: A third gas pipe connected in parallel with the second gas pipe is further provided between the air inlet of the first dryer and the air inlet of the second dryer. A seventh valve close to the first dryer and an eighth valve close to the second dryer are provided on the third gas pipe. A fourth gas pipe is provided between the seventh valve and the eighth valve on the third gas pipe. A sixth gas pipe connected in parallel with the fifth gas pipe is further provided between the air outlet of the first dryer and the air outlet of the second dryer. A tenth valve close to the first dryer and an eleventh valve close to the second dryer are provided on the sixth gas pipe.

4. The zero-loss nitrogen purification device according to claim 3, characterized in that: The post-cooling mechanism includes a post-cooler and a post-vapor-liquid separator communicated with the gas outlet of the post-cooler. A post-cooling pipe is provided at the air inlet of the post-cooler and is communicated therewith. A ninth gas pipe communicated with the first gas pipe is provided at the gas outlet of the post-vapor-liquid separator.

5. The zero-loss nitrogen purification device according to claim 4, wherein: The preheating mechanism includes a pre-heater and a pre-dryer connected in series. An eighth gas pipe is provided at the air inlet of the pre-dryer. A seventh gas pipe communicated with the pre-heater is provided between the tenth valve and the eleventh valve on the sixth gas pipe. The hot-blow regeneration pipe includes a first hot-blow gas pipe provided with a fourth valve at the end of the after-regeneration gas pipe. The first hot-blow gas pipe is communicated with the eighth gas pipe. A second hot-blow gas pipe provided with a ninth valve is provided on the fourth gas pipe. The end of the second hot-blow gas pipe is communicated with the post-cooling pipe.

6. The zero-loss nitrogen purification device according to claim 5, characterized in that: The cold-blow regeneration pipe includes a first cold-blow gas pipe provided with a third valve at the end of the after-regeneration gas pipe. The end of the first cold-blow gas pipe is communicated with the fourth gas pipe. A second cold-blow gas pipe provided with a fourteenth valve is provided at the end of the eighth gas pipe. The end of the second cold-blow gas pipe is communicated with the post-cooling pipe.

7. The zero-loss nitrogen purification device according to claim 6, characterized in that: The seventh valve, the eighth valve, the tenth valve, and the eleventh valve are two-way valves.

8. The zero-loss nitrogen purification device according to claim 7, wherein: A hydrogen content detector, an oxygen content detector, a dew point monitor, and a pressure detector are provided on the nitrogen outlet pipe.

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