CN220959205U - Dirty nitrogen gas discharging equipment of space division rectification system - Google Patents
Dirty nitrogen gas discharging equipment of space division rectification system Download PDFInfo
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- CN220959205U CN220959205U CN202322524830.1U CN202322524830U CN220959205U CN 220959205 U CN220959205 U CN 220959205U CN 202322524830 U CN202322524830 U CN 202322524830U CN 220959205 U CN220959205 U CN 220959205U
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- nitrogen
- dirty nitrogen
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 315
- 229910001873 dinitrogen Inorganic materials 0.000 title claims abstract description 41
- 238000007599 discharging Methods 0.000 title claims description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 137
- 239000007788 liquid Substances 0.000 claims abstract description 79
- 230000001105 regulatory effect Effects 0.000 claims abstract description 19
- 238000000926 separation method Methods 0.000 claims abstract description 18
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000009833 condensation Methods 0.000 claims abstract description 15
- 230000005494 condensation Effects 0.000 claims abstract description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 22
- 239000001301 oxygen Substances 0.000 claims description 22
- 229910052760 oxygen Inorganic materials 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 18
- 239000007789 gas Substances 0.000 claims description 17
- 238000011084 recovery Methods 0.000 claims description 10
- 230000008676 import Effects 0.000 claims description 4
- 239000002994 raw material Substances 0.000 description 14
- 238000010992 reflux Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 239000006096 absorbing agent Substances 0.000 description 4
- 239000002808 molecular sieve Substances 0.000 description 4
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 4
- 238000003795 desorption Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000013526 supercooled liquid Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Abstract
The utility model relates to a dirty nitrogen gas discharge device of an air separation rectification system, which comprises a main heat exchanger and a rectification tower, wherein the rectification tower comprises an upper tower, a main condensation heat exchanger and a lower tower, a liquid nitrogen conveying main pipe and a liquid oxygen conveying pipe are arranged on the main condensation heat exchanger, a first dirty nitrogen gas conveying pipe is arranged on the upper tower and the main heat exchanger, a first turbine expansion machine expansion end is arranged on the first dirty nitrogen gas conveying pipe, a second dirty nitrogen gas conveying pipe is arranged on the first turbine expansion machine expansion end and the main heat exchanger, a first subcooler is arranged on the second dirty nitrogen gas conveying pipe and the main heat exchanger, a second subcooler is arranged on the second dirty nitrogen gas conveying pipe and the liquid oxygen conveying pipe, a first regulating valve is arranged on the second dirty nitrogen gas conveying pipe, a third dirty nitrogen gas conveying pipe is arranged on the second dirty nitrogen gas conveying pipe, and a second regulating valve is arranged on the third dirty nitrogen gas conveying pipe. The temperature and pressure carried by the polluted nitrogen are fully utilized to cool the corresponding medium. The utility model is convenient to adjust and use and has wide market prospect.
Description
Technical Field
The utility model relates to the field of dirty nitrogen gas discharge equipment of an air separation and rectification system, in particular to a dirty nitrogen gas discharge device of an air separation and rectification system.
Background
The main process of the air separation rectification system is that raw material air enters an air compressor after passing through a self-cleaning air filter, enters an air precooler after passing through a post-cooler to be cooled to 8 ℃, and is separated by a water separator to remove free moisture in the air. The air with water, carbon dioxide, acetylene and other hydrocarbon removed in the molecular sieve absorber enters the main heat exchanger, most of the air exits the main heat exchanger and enters the lower tower, one part of the air is liquefied into liquid air, and the other part of the air rises to carry out first rectification. The rising gas and the downflow liquid are fully contacted in the rectifying tower, the concentration of nitrogen in the rising gas is increased after heat and mass transfer, pure nitrogen at the top of the lower tower enters the main condensing evaporator to be condensed into liquid nitrogen, liquid oxygen in the main condensing evaporator is vaporized while the nitrogen is condensed, part of the liquid nitrogen is used as reflux liquid of the lower tower, and the rest of liquid ammonia enters the upper tower to participate in rectification through throttling. And the other part of air is taken out from the middle part of the main heat exchanger and then enters the turbine expander to generate cold energy. The oxygen-enriched liquid air at the bottom of the lower tower is supercooled by a cooler and then throttled to enter the upper tower to participate in rectification. Product nitrogen, product oxygen and dirty nitrogen obtained in the upper column.
The dirty nitrogen is nitrogen containing non-condensable impurity gas and a small amount of oxygen, the functions of the dirty nitrogen are four in the whole air separation and rectification system, and firstly, the dirty nitrogen discharged from the rectification tower is used as a cold source to be conveyed to the main heat exchanger and raw material air entering the main heat exchanger for heat exchange, so that the temperature of the raw material air entering the rectification tower is reduced; secondly, utilizing the polluted nitrogen discharged from the rectifying tower as a cold source of the subcooler so as to reduce the temperature of oxygen-enriched liquid air entering the upper tower, the temperature of partial liquid nitrogen conveyed by a heat source channel of the main condensing heat exchanger and the temperature of liquid oxygen conveyed by the cold source channel of the main condensing heat exchanger; thirdly, utilizing the polluted nitrogen passing through the main heat exchanger as desorption gas of a molecular sieve absorber in the air separation system; and fourthly, the temperature of the cooling water conveyed to the air cooling tower is reduced by using the main heat exchanger as a cold source of the water cooling tower.
In the conventional air separation process, firstly, polluted nitrogen is used as a cold source of a subcooler to cool oxygen-enriched liquid air, liquid nitrogen and liquid oxygen along the temperature from low to high in sequence; after part of carried cold energy is lost in the process of serving as a cold source of the subcooler, one of the cold sources serving as a main heat exchanger exchanges heat with raw material air serving as a heat source and conveyed to the main heat exchanger; the process only utilizes the cold energy carried by the polluted nitrogen, but the polluted nitrogen discharged from the rectifying tower carries corresponding pressure, partial pressure is not converted into cold energy for cooling corresponding liquid medium, the process still has a development space in terms of energy utilization, and the subsequent cooling process is relatively more complicated if the first supercooling of the liquid medium does not meet the ideal target requirement; the raw material air can obtain lower temperature before entering the rectifying tower, so that the raw material air can be more easily rectified in the rectifying tower, and in the prior art, if the temperature of the raw material air entering the rectifying tower is changed, the raw material air with higher pressure needs to enter a turbine expander to perform expansion work so as to obtain the raw material air, but the higher pressure needs to pay more output power for a compressor of the corresponding raw material air, so that the process requirement is comprehensively adjusted from the practical process, the raw material air can obtain lower temperature and cooling for a corresponding liquid medium before entering the rectifying tower, and the operation cost of enterprises is correspondingly reduced.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides the polluted nitrogen gas discharge device of the air separation rectification system, which can fully utilize the temperature and the pressure carried by polluted nitrogen gas to cool raw material air and corresponding liquid medium, and is used for overcoming the defects in the prior art.
The utility model adopts the technical scheme that: the utility model provides a dirty nitrogen gas discharging equipment of air separation rectification system, includes main heat exchanger and the rectifying column that is used for air separation rectification system gas to carry out the heat exchange, the rectifying column from last to including last tower, main condensation heat exchanger and lower tower down in proper order, be provided with liquid nitrogen delivery manifold and liquid oxygen conveyer pipe on the main condensation heat exchanger, last tower and main heat exchanger on be provided with first dirty nitrogen gas conveyer pipe, be provided with the import of first turboexpander expansion end on the exit end of first dirty nitrogen gas conveyer pipe, be provided with the dirty nitrogen gas conveyer pipe of second on the export of first turboexpander expansion end and the main heat exchanger, be provided with first subcooler on dirty nitrogen gas conveyer pipe of second and the liquid oxygen conveyer pipe, be provided with first governing valve on the dirty nitrogen gas conveyer pipe of second between the exit end of second dirty nitrogen gas conveyer pipe and the main heat exchanger, be provided with the dirty entry end of third dirty nitrogen gas conveyer pipe on the dirty nitrogen gas conveyer pipe of second between first governing valve and the main heat exchanger, be provided with the second governing valve on the dirty entry pipe of third.
Preferably, the upper tower and the lower tower are provided with oxygen-enriched liquid air conveying pipes, the oxygen-enriched liquid air conveying pipes are provided with third regulating valves, the oxygen-enriched liquid air conveying pipes and the second polluted nitrogen conveying pipes are provided with third subcoolers, and the lower tower is provided with a liquid level sensor.
Preferably, the pressurizing end of the first turbine expander is arranged on a second dirty nitrogen conveying pipe between a third dirty nitrogen conveying pipe and the main heat exchanger, an inlet of a cold source channel of the auxiliary heat exchanger is arranged at the outlet end of the third dirty nitrogen conveying pipe, a fourth dirty nitrogen conveying pipe is arranged at the outlet of the cold source channel of the auxiliary heat exchanger, and a gas flow sensor and an electric heater are arranged on the fourth dirty nitrogen conveying pipe.
Preferably, the inlet of the heat source channel of the main condensing heat exchanger and the top of the lower tower are provided with high-pressure nitrogen delivery pipes, a liquid nitrogen delivery manifold between the main condensing heat exchanger and the first subcooler and a first liquid nitrogen delivery branch pipe are arranged on the lower tower, a fourth regulating valve is arranged on the liquid nitrogen delivery manifold between the outlet end of the liquid nitrogen delivery manifold and the first subcooler, a second liquid nitrogen delivery branch pipe is arranged on the liquid nitrogen delivery manifold between the fourth regulating valve and the first subcooler and the upper tower, and a fifth regulating valve is respectively arranged on the second liquid nitrogen delivery branch pipe, the first liquid nitrogen delivery branch pipe and the high-pressure nitrogen delivery pipe.
Preferably, the air-conditioning system further comprises an air conveying main pipe, wherein the air conveying main pipe is provided with a pressurizing end of a second turbine expander, inlets of the air conveying main pipe, the main heat exchanger and the expansion end of the second turbine expander are provided with first air conveying branch pipes, outlets of the expansion end of the second turbine expander and the upper tower are provided with second air conveying branch pipes, the air conveying main pipe, the main heat exchanger and the lower tower are provided with third air conveying branch pipes, and the third air conveying branch pipes and the first air conveying branch pipes are respectively provided with sixth regulating valves.
Preferably, a first temperature sensor is arranged on a fourth polluted nitrogen conveying pipe between the gas flow sensor and the electric heater, and a second temperature sensor is arranged on the fourth polluted nitrogen conveying pipe between the outlet end of the fourth polluted nitrogen conveying pipe and the electric heater.
Preferably, a circulating water recovery main pipe is arranged on the heat source channel of the auxiliary heat exchanger, a cooling tower is arranged on the outlet end of the circulating water recovery main pipe, and a third temperature sensor is arranged on the circulating water recovery main pipe between the auxiliary heat exchanger and the cooling tower.
The utility model has the beneficial effects that: firstly, the utility model fully utilizes the temperature carried by the polluted nitrogen and the pressure of the polluted nitrogen to do work for refrigeration, thereby realizing the cooling of raw material air and corresponding liquid medium.
Secondly, the lower tower is provided with a liquid level sensor, and the liquid level sensor is arranged so as to be convenient for feeding back the liquid level height.
Finally, a first temperature sensor is arranged on a fourth polluted nitrogen conveying pipe between the gas flow sensor and the electric heater, and a second temperature sensor is arranged on the fourth polluted nitrogen conveying pipe between the outlet end of the fourth polluted nitrogen conveying pipe and the electric heater; the first temperature sensor and the second temperature sensor are arranged so as to feed back corresponding temperature parameters.
The utility model has the advantages of simple structure, convenient operation, ingenious design, great improvement of working efficiency, good social and economic benefits and easy popularization and use.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Detailed Description
As shown in fig. 1, a dirty nitrogen gas discharging equipment of air separation rectification system, including the main heat exchanger 1, cold box 39 and the rectifying column that is used for air separation rectification system gas to carry out the heat exchange, the rectifying column from top to bottom in proper order include tower 2, main condensation heat exchanger 3 and lower tower 4, be provided with liquid nitrogen delivery manifold 5 and liquid oxygen conveyer pipe 6 on the main condensation heat exchanger 3, tower 2 and main heat exchanger 1 on be provided with first dirty nitrogen gas conveyer pipe 7, be provided with the import of first turboexpander 8 expansion end on the exit end of first dirty nitrogen conveyer pipe 7, be provided with second dirty nitrogen conveyer pipe 9 on the export of first turboexpander 8 expansion end and the main heat exchanger 1, be provided with first subcooler 10 on second dirty nitrogen conveyer pipe 9 and the liquid oxygen conveyer pipe 6, be provided with second subcooler 11 on the second dirty nitrogen conveyer pipe 9 between the exit end of second dirty nitrogen conveyer pipe 9 and the main heat exchanger 1, be provided with first governing valve 12 on the second dirty nitrogen conveyer pipe 9, be provided with dirty nitrogen gas valve 13 on the second governing valve on the second nitrogen gas conveyer pipe 13 and the main heat exchanger 1.
The upper tower 2 and the lower tower 4 are provided with an oxygen-enriched liquid air conveying pipe 15, the oxygen-enriched liquid air conveying pipe 15 is provided with a third regulating valve 16, the oxygen-enriched liquid air conveying pipe 15 and the second polluted nitrogen conveying pipe 9 are provided with a third subcooler 17, the lower tower 4 is provided with a liquid level sensor 33, the bottom end of the lower tower 4 is provided with a drain pipe 40, and the drain pipe 40 is provided with a drain valve 41.
The pressurizing end of the first turbine expander 8 is arranged on the second polluted nitrogen conveying pipe 9 between the third polluted nitrogen conveying pipe 13 and the main heat exchanger 1, an inlet of a cold source channel of the auxiliary heat exchanger 18 is arranged at the outlet end of the third polluted nitrogen conveying pipe 13, a fourth polluted nitrogen conveying pipe 19 is arranged at the outlet of the cold source channel of the auxiliary heat exchanger 18, and a gas flow sensor 20 and an electric heater 21 are arranged on the fourth polluted nitrogen conveying pipe 19.
The inlet of the heat source channel of the main condensing heat exchanger 3 and the top of the lower tower 4 are provided with high-pressure nitrogen delivery pipes 22, a liquid nitrogen delivery manifold 5 between the main condensing heat exchanger 3 and the first subcooler 10 and the lower tower 4 are provided with first liquid nitrogen delivery branch pipes 23, a fourth regulating valve 24 is arranged on the liquid nitrogen delivery manifold 5 between the outlet end of the liquid nitrogen delivery manifold 5 and the first subcooler 10, and a second liquid nitrogen delivery branch pipe 25 is arranged on the liquid nitrogen delivery manifold 5 between the fourth regulating valve 24 and the first subcooler 10 and the upper tower 2, and fifth regulating valves 26 are respectively arranged on the second liquid nitrogen delivery branch pipe 25, the first liquid nitrogen delivery branch pipe 23 and the high-pressure nitrogen delivery pipes 22.
The product also comprises an air conveying main pipe 27, wherein the air conveying main pipe 27 is provided with a pressurizing end of a second turbine expander 28, inlets of the air conveying main pipe 27, the main heat exchanger 1 and the expansion end of the second turbine expander 28 are provided with first air conveying branch pipes 29, outlets of the expansion end of the second turbine expander 28 and the upper tower 2 are provided with second air conveying branch pipes 30, the air conveying main pipe 27, the main heat exchanger 1 and the lower tower 4 are provided with third air conveying branch pipes 31, and the third air conveying branch pipes 31 and the first air conveying branch pipes 29 are respectively provided with sixth regulating valves 32.
The first temperature sensor 34 is arranged on the fourth polluted nitrogen conveying pipe 19 between the gas flow sensor 20 and the electric heater 21, and the second temperature sensor 35 is arranged on the fourth polluted nitrogen conveying pipe 19 between the outlet end of the fourth polluted nitrogen conveying pipe 19 and the electric heater 21.
The heat source channel of the auxiliary heat exchanger 18 is provided with a circulating water recovery main pipe 36, the outlet end of the circulating water recovery main pipe 36 is provided with a cooling tower 37, and a third temperature sensor 38 is arranged on the circulating water recovery main pipe 36 between the auxiliary heat exchanger 18 and the cooling tower 37.
The application method of the product is as follows: as shown in fig. 1, compressed air delivered by an upstream purification device of the air separation system is delivered to an air delivery manifold 27, pressurized again by a pressurizing end of a second turbo expander 28, and then divided into two parts, wherein the first part of compressed air is delivered to a first air delivery branch pipe 29, then delivered to a first heat source channel of the main heat exchanger 1 as a heat source, delivered to an expansion end of the second turbo expander 28 again for expansion work, and delivered to the upper tower 2 through a second air delivery branch pipe 30 to participate in rectification of the upper tower 2. The second part of the compressed air is supplied to the third air supply branch 31 and then supplied as a heat source to the second heat source channel of the main heat exchanger 1 and then to the lower column 4 to participate in the rectification of the lower column 4.
During the continuous upward period of the compressed air entering the lower tower 4 and the direct heat exchange of the reflux condensate descending from the top of the lower tower 4, the nitrogen component in the compressed air entering the lower tower 4 continuously rises and forms a high-purity nitrogen enrichment zone of the lower tower 4 at the top of the lower tower 4, the oxygen component in the compressed air of the lower tower 4 is liquefied and the reflux condensate falling along with the liquefaction is enriched in the lower tower 4 to form an oxygen-enriched liquid space, and the liquid level of the lower tower 4 is fed back by a liquid level sensor 33.
The nitrogen in the high-purity nitrogen enrichment area at the top of the lower tower 4 is conveyed to the heat source channels of the main condensing heat exchanger 3 and the heat source heat exchange of the cold source channels of the main condensing heat exchanger 3 through a high-pressure nitrogen conveying pipe 22, the outlet of the heat source channel of the main condensing heat exchanger 3 discharges liquid nitrogen and is conveyed to the liquid nitrogen conveying main pipe 5 and is divided into two parts, the first part of liquid nitrogen is conveyed back to the lower tower 4 through a first liquid nitrogen conveying branch pipe 23 to serve as reflux condensate of the lower tower 4, the second part of liquid nitrogen continuously moves along the liquid nitrogen conveying main pipe 5 and is conveyed to the heat source channel of the first subcooler 10 and the heat source medium continuously conveyed to the cold source channel of the first subcooler 10 for heat exchange, the outlet of the heat source channel of the first subcooler 10 discharges supercooled liquid nitrogen and is divided into two parts again, and the first part of supercooled liquid nitrogen continuously moves along the liquid nitrogen conveying main pipe 5 and is conveyed to a corresponding liquid nitrogen storage tank; the second portion of subcooled liquid nitrogen is then fed to upper column 2 via second liquid nitrogen feed leg 25 as the first reflux condensate for upper column 2.
The oxygen-enriched liquid air of the lower tower 4 is continuously conveyed to the heat exchange of the cold source channel of the third subcooler 17 through the heat source channel of the third subcooler 17 by the oxygen-enriched liquid air conveying pipe 15, and then is continuously conveyed to the upper tower 2 along the oxygen-enriched liquid air conveying pipe 15 to serve as the second reflux condensate of the upper tower 2.
The compressed air entering the upper tower 2 is subjected to direct heat exchange with the first reflux condensate and the second reflux condensate which continuously descend along the inner cavity of the upper tower 2 during the continuous ascending period, and the nitrogen component in the compressed air entering the upper tower 2, the nitrogen component of the first reflux condensate and the nitrogen component of the second reflux condensate are gradually changed into gases which are accompanied with the ascending, so that a nitrogen enrichment zone at the top of the upper tower 2 is formed at the top of the upper tower 2; the oxygen component in the compressed air entering the upper tower 2, the oxygen component in the first reflux condensate and the oxygen component in the second reflux condensate are all gradually in liquid form and are accompanied with descending liquid to descend along the inner cavity of the upper tower 2 and enter the cold source of the main condensation heat exchanger 3 as the cold source of the main condensation heat exchanger 3, after the cold source entering the cold source channel of the main condensation heat exchanger 3 and the heat source continuously conveyed to the heat source channel of the main condensation heat exchanger 3 exchange heat, the nitrogen component in the liquid entering the cold source channel of the main condensation heat exchanger 3 is vaporized, finally, a liquid oxygen enrichment zone is formed in the cold source channel of the main condensation heat exchanger 3, and the liquid oxygen in the cold source channel of the main condensation heat exchanger 3 passes through the heat source channel of the second subcooler 11 and the cold source continuously conveyed to the cold source channel of the second subcooler 11 to exchange heat, and the outlet of the heat source channel of the second subcooler 11 discharges the liquid oxygen and continuously conveys the liquid oxygen to the liquid oxygen storage tank along the outlet of the heat source channel of the second subcooler 11.
The impurity-containing part in the nitrogen enrichment zone at the top of the upper tower 2 forms polluted nitrogen and is conveyed to the first polluted nitrogen conveying pipe 7, heat exchange is carried out through the first cold source channel of the main heat exchanger 1 and the heat source continuously conveyed to the main heat exchanger 1, the polluted nitrogen is conveyed to the expansion end of the first turbine expander 8 for expansion and cooling and is conveyed to the second polluted nitrogen conveying pipe 9, and the polluted nitrogen is conveyed to the cold source channel of the first subcooler 10, the cold source channel of the second subcooler 11 and the cold source channel of the third subcooler 17, is conveyed to the second cold source channel of the main heat exchanger 1 and the heat source continuously conveyed to the main heat exchanger 1 for heat exchange, is pressurized through the pressurizing end of the first turbine expander 8 and is continuously conveyed to the water cooling tower in the air separation system along the second polluted nitrogen conveying pipe 9 to serve as the cold source of the water cooling tower for cooling the circulating water entering the water cooling tower.
When the molecular sieve absorber in the air separation system needs to provide desorption gas, the opening degrees of the first regulating valve 12 and the second regulating valve 14 need to be reasonably adjusted at the moment, the polluted nitrogen conveyed by the second polluted nitrogen conveying pipe 9 is divided into two parts, and the polluted nitrogen in the first part continuously moves forward along the second polluted nitrogen conveying pipe 9 and is conveyed to the water cooling tower in the air separation system; the second part of polluted nitrogen is conveyed to the cold source channel of the auxiliary heat exchanger 18 through the third polluted nitrogen conveying pipe 13 and is conveyed to the circulating water backwater heat exchange of the cold source channel of the auxiliary heat exchanger 18 through the circulating water recovery main pipe 36, the cold source channel of the auxiliary heat exchanger 18 discharges polluted nitrogen subjected to first reheating to the fourth polluted nitrogen conveying pipe 19, the temperature is fed back through the first temperature sensor 34, the polluted nitrogen is conveyed to the electric heater 21 for second reheating, and the polluted nitrogen is conveyed as desorption gas to the molecular sieve absorber needing to be desorbed after the temperature is fed back through the second temperature sensor 35.
According to the embodiment, the temperature carried by the polluted nitrogen is fully utilized, the pressure of the polluted nitrogen is utilized to do work for refrigeration, and the temperature of raw material air and a corresponding liquid medium is reduced.
The above-described embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, so that all equivalent changes or modifications of the structure, characteristics and principles described in the claims should be included in the scope of the present utility model.
Claims (7)
1. The utility model provides a dirty nitrogen gas discharging equipment of air separation rectification system, includes main heat exchanger (1) and rectifying column that are used for air separation rectification system gas to carry out heat exchange, rectifying column from last to including tower (2), main condensation heat exchanger (3) and lower tower (4) down in proper order, be provided with liquid nitrogen delivery house steward (5) and liquid oxygen conveyer pipe (6), its characterized in that on main condensation heat exchanger (3): the utility model provides a tower on (2) and main heat exchanger (1) on be provided with first dirty nitrogen gas conveyer pipe (7), be provided with the import of first turboexpander (8) expansion end on the exit end of first dirty nitrogen gas conveyer pipe (7), be provided with second dirty nitrogen gas conveyer pipe (9) on the export of first turboexpander (8) expansion end and main heat exchanger (1), be provided with first subcooler (10) on second dirty nitrogen gas conveyer pipe (9) and the liquid nitrogen delivery house steward (5), be provided with second subcooler (11) on second dirty nitrogen gas conveyer pipe (9) and the liquid oxygen conveyer pipe (6), be provided with first governing valve (12) on second dirty nitrogen gas conveyer pipe (9) between the exit end of second dirty nitrogen gas conveyer pipe (9) and main heat exchanger (1), be provided with the import end of third dirty nitrogen gas conveyer pipe (13) on second dirty nitrogen gas conveyer pipe (9) between first governing valve (12) and main heat exchanger (1), be provided with second governing valve (14) on the third dirty nitrogen gas conveyer pipe (13).
2. The dirty nitrogen discharging apparatus of a space division rectification system as recited in claim 1, wherein: the upper tower (2) and the lower tower (4) are provided with an oxygen-enriched liquid air conveying pipe (15), the oxygen-enriched liquid air conveying pipe (15) is provided with a third regulating valve (16), the oxygen-enriched liquid air conveying pipe (15) and the second polluted nitrogen conveying pipe (9) are provided with a third subcooler (17), and the lower tower (4) is provided with a liquid level sensor (33).
3. The dirty nitrogen discharging apparatus of a space division rectification system as recited in claim 1, wherein: the supercharging end of the first turbine expander (8) is arranged on a second dirty nitrogen conveying pipe (9) between a third dirty nitrogen conveying pipe (13) and the main heat exchanger (1), an inlet of a cold source channel of the auxiliary heat exchanger (18) is arranged at the outlet end of the third dirty nitrogen conveying pipe (13), a fourth dirty nitrogen conveying pipe (19) is arranged at the outlet of the cold source channel of the auxiliary heat exchanger (18), and a gas flow sensor (20) and an electric heater (21) are arranged on the fourth dirty nitrogen conveying pipe (19).
4. The dirty nitrogen discharging apparatus of a space division rectification system as recited in claim 1, wherein: the high-pressure nitrogen gas conveying pipe (22) is arranged at the inlet of the heat source channel of the main condensing heat exchanger (3) and the top of the lower tower (4), a first liquid nitrogen conveying branch pipe (23) is arranged on the liquid nitrogen conveying main pipe (5) between the main condensing heat exchanger (3) and the first subcooler (10) and the lower tower (4), a fourth regulating valve (24) is arranged on the liquid nitrogen conveying main pipe (5) between the outlet end of the liquid nitrogen conveying main pipe (5) and the first subcooler (10), a second liquid nitrogen conveying branch pipe (25) is arranged on the liquid nitrogen conveying main pipe (5) between the fourth regulating valve (24) and the first subcooler (10) and the upper tower (2), and a fifth regulating valve (26) is uniformly arranged on the second liquid nitrogen conveying branch pipe (25), the first liquid nitrogen conveying branch pipe (23) and the high-pressure nitrogen conveying pipe (22).
5. The dirty nitrogen discharging apparatus of a space division rectification system as recited in claim 1, wherein: the novel heat exchanger comprises a main air conveying pipe (27), and is characterized in that a pressurizing end of a second turbine expander (28) is arranged on the main air conveying pipe (27), first air conveying branch pipes (29) are arranged at inlets of the expansion ends of the main air conveying pipe (27), a main heat exchanger (1) and the second turbine expander (28), second air conveying branch pipes (30) are arranged at outlets of the expansion ends of the second turbine expander (28) and an upper tower (2), third air conveying branch pipes (31) are arranged on the main air conveying pipe (27), the main heat exchanger (1) and a lower tower (4), and sixth regulating valves (32) are uniformly arranged on the third air conveying branch pipes (31) and the first air conveying branch pipes (29).
6. A dirty nitrogen discharging apparatus of a space division rectification system as claimed in claim 3, wherein: a first temperature sensor (34) is arranged on a fourth polluted nitrogen conveying pipe (19) between the gas flow sensor (20) and the electric heater (21), and a second temperature sensor (35) is arranged on the fourth polluted nitrogen conveying pipe (19) between the outlet end of the fourth polluted nitrogen conveying pipe (19) and the electric heater (21).
7. A dirty nitrogen discharging apparatus of a space division rectification system as claimed in claim 3, wherein: the heat source channel of the auxiliary heat exchanger (18) is provided with a circulating water recovery main pipe (36), the outlet end of the circulating water recovery main pipe (36) is provided with a cooling tower (37), and a third temperature sensor (38) is arranged on the circulating water recovery main pipe (36) between the auxiliary heat exchanger (18) and the cooling tower (37).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322524830.1U CN220959205U (en) | 2023-09-18 | 2023-09-18 | Dirty nitrogen gas discharging equipment of space division rectification system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322524830.1U CN220959205U (en) | 2023-09-18 | 2023-09-18 | Dirty nitrogen gas discharging equipment of space division rectification system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220959205U true CN220959205U (en) | 2024-05-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322524830.1U Active CN220959205U (en) | 2023-09-18 | 2023-09-18 | Dirty nitrogen gas discharging equipment of space division rectification system |
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| Country | Link |
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| CN (1) | CN220959205U (en) |
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2023
- 2023-09-18 CN CN202322524830.1U patent/CN220959205U/en active Active
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