CN209877485U - Air separation system - Google Patents
Air separation system Download PDFInfo
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- CN209877485U CN209877485U CN201920558127.3U CN201920558127U CN209877485U CN 209877485 U CN209877485 U CN 209877485U CN 201920558127 U CN201920558127 U CN 201920558127U CN 209877485 U CN209877485 U CN 209877485U
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Abstract
The utility model belongs to the technical field of the air separation, especially, relate to an air separation system. The air separation system provided by the utility model comprises an air separation tower, wherein the air separation tower comprises a lower tower and an upper tower, the upper tower is provided with a liquid nitrogen inlet, an air inlet, a liquid phase outlet and a plurality of gas phase outlets, and the position of the liquid nitrogen inlet is higher than that of the air inlet; an air delivery conduit connected to the air inlet; and the liquid nitrogen conveying pipeline is connected with the liquid nitrogen inlet. When the air separation system is started, liquid nitrogen and air are respectively input into an upper tower of the air separation tower through corresponding conveying pipelines, condensation and liquid nitrogen gasification of rising air are achieved column by column plate, and condensed liquid flows to the bottom of the upper tower to form accumulated liquid. The utility model provides an air separation system uses the liquid nitrogen to carry out gas-liquid heat transfer mass transfer as cold source and air, utilizes the liquid nitrogen to promote the air and condense the liquefaction fast in last tower to shorten the time of the bottom hydrops of the in-process of opening a work by a wide margin.
Description
Technical Field
The utility model belongs to the technical field of the air separation, especially, relate to an air separation system.
Background
With the development of industry and science and technology, the requirements of various industries on oxygen, nitrogen and liquid products thereof are increased, and particularly the requirements on steel smelting, the development and the upgrade of coal products and aerospace are increased. Large air separation plants are being deployed nationwide and have taken a significant position in the national economy.
The air separation device is used for processing air, liquefying the normal temperature air through a series of treatments and performing rectification to obtain products such as oxygen, nitrogen, liquid oxygen, liquid nitrogen and the like. In order to achieve liquefaction of air, the air must be pressurized and heat exchanged by converting electrical energy into mechanical energy and ultimately into pressure energy. With the increase of product demand, the maximum air separation oxygen yield in China at present can reach 10 ten thousand Nm3And/h, behind which is a bulky set of energy consuming equipment. The start-up stage of the air separation device needs to pass through three stages, namely cooling, liquid accumulation and purity regulation, wherein the three stages are carried out one by one, and the shortage is not necessary. Theoretically, the minimum time for the three phases is 36 hours, and the time for achieving this must be achieved by operating the plant at full capacity, which is quite surprising for medium-and large-sized air separation plants.
The shortening of the start-up time of the air separation device can be realized by optimizing the liquid loading process, for example, optimizing the equipment and pipeline cooling process, namely changing the trend and flow of air by closing a valve on an air heat exchange pipeline, so that the hot air in an upper tower is reduced as much as possible, the cold quantity is sufficient, more liquid is obtained, and the accumulation of the low-temperature liquid is realized, but the effect reached by the method is very limited.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing an air separation system, the utility model provides a system can shorten the air separation tower by a wide margin and start stage tower hydrops time.
The utility model provides an air separation system, include:
the air separation tower comprises a lower tower and an upper tower, the upper tower is provided with a liquid nitrogen inlet, an air inlet, a liquid phase outlet and a plurality of gas phase outlets, and the position of the liquid nitrogen inlet is higher than that of the air inlet; the lower tower is provided with a lower tower inlet and a tower bottom liquid outlet, and the tower bottom liquid outlet is connected with the liquid air inlet;
an air delivery conduit connected to the air inlet;
and the liquid nitrogen conveying pipeline is connected with the liquid nitrogen inlet.
Preferably, the device also comprises a liquid nitrogen storage tank, and a discharge port of the liquid nitrogen storage tank is connected with a feed end of the liquid nitrogen conveying pipeline.
Preferably, a liquid nitrogen pump is arranged on the liquid nitrogen conveying pipeline.
Preferably, the upper tower is a packed tower.
Preferably, the lower column is a tray column.
Preferably, a condensation evaporator is arranged at the bottom of the upper tower, an air inlet of the condensation evaporator is connected with an air outlet at the top of the lower tower, and a condensate outlet of the condensation evaporator is connected with a condensate reflux port of the lower tower.
Preferably, the liquid phase outlet is located at the bottom of the upper column.
Preferably, the number of the gas phase outlets is three, the first gas phase outlet is positioned at the top of the upper tower, the second gas phase outlet is positioned between the liquid nitrogen inlet and the air inlet, and the third gas phase outlet is positioned below the air inlet and the liquid air inlet.
Compared with the prior art, the utility model provides an air separation system. The utility model provides an air separation system comprises an air separation tower, wherein the air separation tower comprises a lower tower and an upper tower, the upper tower is provided with a liquid nitrogen inlet, an air inlet, a liquid phase outlet and a plurality of gas phase outlets, and the position of the liquid nitrogen inlet is higher than that of the air inlet; the lower tower is provided with a lower tower inlet and a tower bottom liquid outlet, and the tower bottom liquid outlet is connected with the liquid air inlet; an air delivery conduit connected to the air inlet; and the liquid nitrogen conveying pipeline is connected with the liquid nitrogen inlet. When the air separation system is started, liquid nitrogen and air are respectively input into an upper tower of the air separation tower through corresponding conveying pipelines, condensation and liquid nitrogen gasification of rising air are achieved column by column plate, and condensed liquid flows to the bottom of the upper tower to form accumulated liquid. The utility model provides an air separation system uses the liquid nitrogen to carry out gas-liquid heat transfer mass transfer as cold source and air, utilizes the liquid nitrogen to promote the air and condense the liquefaction fast in last tower to shorten the time of the bottom hydrops of the in-process of opening a work by a wide margin.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic view of an air separation system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model provides an air separation system, include:
the air separation tower comprises a lower tower and an upper tower, the upper tower is provided with a liquid nitrogen inlet, an air inlet, a liquid phase outlet and a plurality of gas phase outlets, and the position of the liquid nitrogen inlet is higher than that of the air inlet; the lower tower is provided with a lower tower inlet and a tower bottom liquid outlet, and the tower bottom liquid outlet is connected with the liquid air inlet;
an air delivery conduit connected to the air inlet;
and the liquid nitrogen conveying pipeline is connected with the liquid nitrogen inlet.
Referring to fig. 1, fig. 1 is a schematic view of an air separation system according to an embodiment of the present invention, in fig. 1, 1 denotes a liquid nitrogen storage tank, 2 denotes a liquid nitrogen pump, 3 denotes a liquid nitrogen transfer pipe, 4 denotes an air separation tower, 5 denotes a lower tower, 6 denotes a condensing evaporator, 7 denotes an upper tower, and 8 denotes an air transfer pipe.
The utility model provides an air separation system includes air separation tower 4, air conveying pipeline 8 and liquid nitrogen pipeline 3, and wherein, air separation tower 4 includes tower 5 and last tower 7 down. The utility model discloses in, lower tower 5 is the high-pressure column, is provided with tower entry and tower bottom liquid export down on it for carry out preseparation to the air, obtain liquid air and nitrogen gas. In an embodiment of the present invention, the lower tower 5 is further provided with a tower top gas outlet and a condensate reflux opening. In one embodiment provided by the present invention, the lower tower 5 is a plate tower.
The utility model discloses in, upper tower 7 is the low pressure column for carry out the rectification separation to the liquid air, be provided with liquid nitrogen entry, air inlet, liquid air entry, liquid phase export and a plurality of gaseous phase export on it, the position of liquid nitrogen entry is higher than air inlet. In one embodiment of the present invention, the liquid phase outlet is located at the bottom of the upper tower 7 and serves as a channel for the outward transport of the liquid (liquid oxygen) at the bottom of the tower. In one embodiment provided by the present invention, the number of the gas phase outlets is three, wherein the first gas phase outlet is located at the top of the upper tower 7 and is used as a channel for transporting pure nitrogen to the outside; the second gas phase outlet is positioned between the liquid nitrogen inlet and the air inlet and is used as a channel for conveying the waste nitrogen outwards; and the third gas phase outlet is positioned below the air inlet and the liquid air inlet and is used as a channel for conveying oxygen outwards. In one embodiment provided by the present invention, the upper column 7 is a packed column.
The utility model provides an in one embodiment, the tower bottom of upper tower 7 is provided with condensation evaporator 6, and condensation evaporator 6's air inlet links to each other with the top of the tower gas outlet of lower tower 5, and condensation evaporator 6's condensate export links to each other with the condensate backward flow mouth of lower tower 5. The utility model discloses in, when lower tower operation, the pressure nitrogen that lower tower 5 separation obtained gets into condensation evaporator 6 through the gas outlet of the top of the tower, heats the liquid oxygen at the bottom of the tower 7 as the heat source, makes liquid oxygen evaporate once more, and accomplishes the nitrogen gas condensation of heat transfer in condensation evaporator 6, later returns through the condensate backward flow mouth down in tower 5.
The utility model discloses in, the end of giving vent to anger of air conveying pipeline 8 with air inlet is connected for carry the air to supreme tower 7.
The utility model discloses in, liquid nitrogen pipeline 3's discharge end with the liquid nitrogen entry is connected for carry the liquid nitrogen to supreme tower 7. In one embodiment provided by the utility model, the liquid nitrogen conveying pipeline 3 is provided with a liquid nitrogen pump 2. In an embodiment of the present invention, the air separation system further includes a liquid nitrogen storage tank 1, and a discharge port of the liquid nitrogen storage tank 1 is connected to a feed end of the liquid nitrogen conveying pipeline 3.
The utility model provides an air separation system process flow as follows: liquid nitrogen and air are respectively input into an upper tower of the air separation tower through corresponding conveying pipelines, the condensation of ascending air and the gasification of the liquid nitrogen are realized column by column plate, and condensed liquid flows to the bottom of the upper tower to form liquid loading.
The utility model provides an air separation system uses the liquid nitrogen to carry out gas-liquid heat transfer mass transfer as cold source and air, utilizes the liquid nitrogen to promote the air and condense the liquefaction fast in last tower to shorten the time of the bottom hydrops of the in-process of opening a work by a wide margin.
The utility model also provides a method that air separation system carries out hydrops in the stage of starting work, including following step:
when the air separation system is started up in the technical scheme, liquid nitrogen and air are respectively input into the upper tower of the air separation tower through the corresponding conveying pipelines, and the liquid nitrogen promotes the air to be condensed and liquefied in the upper tower to form accumulated liquid.
In the method provided by the present invention, the air is dividedWhen the system is started, liquid nitrogen and air are respectively input into an upper tower of the air separation tower through corresponding conveying pipelines, wherein the temperature of the liquid nitrogen is preferably < -190 ℃, and can be-193 ℃; the purity of the liquid nitrogen is preferably more than or equal to 99.99 percent; CO in the air2The content is preferably less than or equal to 1 ppm; the dew point of the air is preferably ≦ 60 ℃. The utility model discloses in, the liquid nitrogen is as cold source top-down to flow downwards by the column plate, and the air that rises by the column plate from bottom to top carries out gas-liquid heat transfer mass transfer, and partial air is condensed for the liquid flows downwards to the upper column bottom formation hydrops by the column plate, and the liquid nitrogen is heated again and is emptied for dirty nitrogen. In the utility model, the oxygen content of the polluted nitrogen is preferably higher than 4%; the accumulated liquid is liquid oxygen, and the purity of the liquid oxygen is preferably more than or equal to 99.6%. The utility model discloses in, preferably carry the liquid nitrogen again to the last tower when last bottom of the tower satisfies the beginning hydrops condition in, its flow needs to decide according to pressure and air-handling capacity in the tower, and pressure is preferred not to be higher than 32KPaG under the normal conditions, and air-handling capacity is preferred to increase along with the rising of hydrops volume.
The utility model provides a method uses the liquid nitrogen as the cold source, makes the air condense the liquefaction fast in last tower to shorten the time of the bottom hydrops of the in-process of starting work by a wide margin.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. An air separation system, comprising:
the air separation tower comprises a lower tower and an upper tower, the upper tower is provided with a liquid nitrogen inlet, an air inlet, a liquid phase outlet and a plurality of gas phase outlets, and the position of the liquid nitrogen inlet is higher than that of the air inlet; the lower tower is provided with a lower tower inlet and a tower bottom liquid outlet, and the tower bottom liquid outlet is connected with the liquid air inlet;
an air delivery conduit connected to the air inlet;
and the liquid nitrogen conveying pipeline is connected with the liquid nitrogen inlet.
2. The system of claim 1, further comprising a liquid nitrogen storage tank, wherein a discharge port of the liquid nitrogen storage tank is connected with a feed end of the liquid nitrogen delivery pipe.
3. The system according to claim 1, wherein the liquid nitrogen delivery pipe is provided with a liquid nitrogen pump.
4. The system of claim 1, wherein the upper column is a packed column.
5. The system of claim 1, wherein the lower column is a tray column.
6. The system as claimed in claim 1, wherein a condensing evaporator is arranged at the bottom of the upper tower, the gas inlet of the condensing evaporator is connected with the gas outlet at the top of the lower tower, and the condensate outlet of the condensing evaporator is connected with the condensate reflux port of the lower tower.
7. The system of claim 1, wherein the liquid phase outlet is located at the bottom of the upper column.
8. The system of claim 1, wherein the gas phase outlets are three, a first gas phase outlet is located at the top of the upper column, a second gas phase outlet is located between the liquid nitrogen inlet and the air inlet, and a third gas phase outlet is located below the air inlet and the liquid air inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920558127.3U CN209877485U (en) | 2019-04-23 | 2019-04-23 | Air separation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920558127.3U CN209877485U (en) | 2019-04-23 | 2019-04-23 | Air separation system |
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| Publication Number | Publication Date |
|---|---|
| CN209877485U true CN209877485U (en) | 2019-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920558127.3U Active CN209877485U (en) | 2019-04-23 | 2019-04-23 | Air separation system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109974394A (en) * | 2019-04-23 | 2019-07-05 | 山东京博众诚清洁能源有限公司 | A kind of method that air-seperation system and its stage that goes into operation carry out hydrops |
| CN109974394B (en) * | 2019-04-23 | 2024-06-21 | 山东京博众诚清洁能源有限公司 | Air separation system and method for carrying out effusion in start-up stage thereof |
-
2019
- 2019-04-23 CN CN201920558127.3U patent/CN209877485U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109974394A (en) * | 2019-04-23 | 2019-07-05 | 山东京博众诚清洁能源有限公司 | A kind of method that air-seperation system and its stage that goes into operation carry out hydrops |
| CN109974394B (en) * | 2019-04-23 | 2024-06-21 | 山东京博众诚清洁能源有限公司 | Air separation system and method for carrying out effusion in start-up stage thereof |
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