CN214892167U - Device for increasing nitrogen gas amount of air separation equipment - Google Patents
Device for increasing nitrogen gas amount of air separation equipment Download PDFInfo
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- CN214892167U CN214892167U CN202121026680.6U CN202121026680U CN214892167U CN 214892167 U CN214892167 U CN 214892167U CN 202121026680 U CN202121026680 U CN 202121026680U CN 214892167 U CN214892167 U CN 214892167U
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Abstract
The utility model belongs to the technical field of air separation equipment, a increase device of air separation equipment nitrogen gas tolerance is disclosed, the device include air separation equipment body, reciprocating type cryopump, water bath vaporizer, the air separation equipment body includes liquid nitrogen storage tank, high-pressure nitrogen gas pipe network, and the liquid outlet of liquid nitrogen storage tank links to each other through reciprocating type cryopump and water bath vaporizer's high-pressure liquid nitrogen import, and water bath vaporizer's nitrogen gas export links to each other with high-pressure nitrogen gas pipe network. The device can realize that a single set of air separation equipment can meet the load requirement of urea production and can also play the dual purpose of energy saving.
Description
Technical Field
The utility model belongs to the technical field of air separation plant, specifically, relate to an increase device of air separation plant nitrogen gas tolerance.
Background
The specific operation principle of the air separation plant generally comprises: compressing air sucked into the atmosphere to a certain pressure (such as 0.52MPa), sending the compressed air to a purifier, pressurizing the compressed air to a certain pressure (such as 1.235MPa) by a supercharger for one section, extracting the compressed air as instrument gas and device air, pressurizing the compressed air to a certain pressure (such as 2.7MPa) by a supercharger for two sections, extracting the instrument gas and device air, sending the instrument gas and device air to a booster turboexpander, and then sending the instrument gas and device air to a cold box. The rest part is continuously pressurized to a certain pressure (such as 7.0MPa) by the three sections of the pressurizers and then sent to the cold box. Air entering the cold box is separated through the operations of a refrigeration system, a heat exchange system, a rectification system and the like, the produced oxygen, nitrogen, instrument air, device air and the like are used by a rear system, and meanwhile, liquid oxygen, liquid nitrogen and liquid argon are by-produced and sold to the outside.
The usage amount of the device for producing urea to the high-pressure oxygen is 24000Nm3About/h, the usage amount of high-pressure nitrogen is 33000Nm3H, and the high-pressure oxygen load which can be met by a single air separation plant is 25000m3Per h, high pressure nitrogen load 23500Nm3And about/h. Therefore, a single set of air separation equipment cannot meet the use amount of high-pressure oxygen and nitrogen of a urea production device, and if two sets of air separation equipment are operated simultaneously, the production requirement can be met, but the energy waste can be greatly caused.
SUMMERY OF THE UTILITY MODEL
The above-mentioned problem to prior art exists, the utility model aims at providing an increase device of air separation plant nitrogen gas tolerance can realize that single set of air separation plant operation can satisfy the load needs of urea production, can play the dual purpose of energy-conservation simultaneously again.
In order to achieve the above object, the present invention is realized by the following technical solutions:
the utility model provides an increase device of air separation plant nitrogen gas tolerance, the device includes air separation plant body, reciprocating type cryopump, water bath formula vaporizer, and the air separation plant body includes liquid nitrogen storage tank, high-pressure nitrogen gas pipe network, and the liquid outlet of liquid nitrogen storage tank links to each other through reciprocating type cryopump and water bath formula vaporizer's high-pressure liquid nitrogen import, and water bath formula vaporizer's nitrogen gas export links to each other with high-pressure nitrogen gas pipe network.
Preferably, two reciprocating cryopumps are provided in parallel. The two reciprocating cryogenic pumps are started and reserved one by one, the reciprocating cryogenic pumps are operated in a frequency conversion mode, flexible adjustment can be achieved according to production load requirements, and when the production load changes and the nitrogen gas amount needs to be changed, the frequency conversion of the reciprocating cryogenic pumps is adjusted to achieve the purpose.
Preferably, a return pipeline of the reciprocating cryogenic pump is connected to a vent pipe of the liquid nitrogen storage tank, and part of liquid is recovered.
Preferably, the water bath type vaporizer takes low-pressure steam as a heat exchange medium, and condensate is delivered. The water bath type vaporizer can utilize the original water bath type vaporizer in the air separation plant body, the pressurized liquid nitrogen is introduced into a high-pressure liquid oxygen channel of the original water bath type vaporizer, the liquid nitrogen is gasified to normal temperature and then is merged into a high-pressure nitrogen pipe network, and the original high-pressure oxygen pipe network is sealed by a blind plate without use.
The utility model discloses in still including other subassemblies that can make this device that increases air separation plant nitrogen gas volume normal use, for example, the valve of control material flow, these all belong to the conventional selection in this field. In addition, the device or the component which is not limited in the utility model adopts the conventional means in the field, for example, the reciprocating type cryogenic pump, the water bath type vaporizer, the air separation plant body and the like adopt the conventional arrangement.
The utility model discloses an increase air separation plant nitrogen gas tolerance's device's theory of operation includes that the liquid nitrogen in the liquid nitrogen storage tank pressurizes to 4.8Mpa through reciprocating type cryopump, then gets into water bath vaporizer and carries out the heat exchange with low pressure steam, and liquid nitrogen gasification is to the normal atmospheric temperature after, and the high-pressure nitrogen gas that obtains merges high-pressure nitrogen gas pipe network to improve air separation plant's high-pressure nitrogen gas tolerance.
The utility model discloses an increase device of air separation plant nitrogen gas tolerance on original air separation plant's basis, increase a small amount of equipment and can improve air separation plant's high-pressure nitrogen gas tolerance, make single set of air separation plant can satisfy the load needs of urea production, avoid two sets of air separation plant operations to cause the energy extravagant.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for increasing the nitrogen gas amount of an air separation plant according to an embodiment.
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, 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 all belong to the protection scope of the present invention.
Examples
As shown in figure 1, the device for increasing the nitrogen gas amount of the air separation plant comprises an air separation plant body, a reciprocating type cryogenic pump 1 and a water bath type vaporizer 2, wherein the air separation plant body comprises a liquid nitrogen storage tank 3 and a high-pressure nitrogen gas pipe network, a liquid outlet of the liquid nitrogen storage tank 3 is connected with a high-pressure liquid nitrogen inlet of the water bath type vaporizer 2 through the reciprocating type cryogenic pump 1, and a nitrogen outlet of the water bath type vaporizer 2 is connected with the high-pressure nitrogen gas pipe network.
Two reciprocating cryopumps 1 are connected in parallel, and one of the two reciprocating cryopumps 1 is provided with one pump.
The return pipeline of the reciprocating type cryogenic pump 1 is connected to the emptying pipe of the liquid nitrogen storage tank 3, and part of liquid is recycled.
The water bath type vaporizer 2 takes low-pressure steam b as a heat exchange medium, and condensate c is delivered out.
The working principle of the device for increasing the nitrogen gas amount of the air separation equipment comprises the steps that liquid nitrogen in a liquid nitrogen storage tank 3 is pressurized to 4.8Mpa through a reciprocating type low-temperature pump 1, then enters a water bath type vaporizer 2 to perform heat exchange with low-pressure steam b, and after the liquid nitrogen is gasified to normal temperature, obtained high-pressure nitrogen gas a is merged into a high-pressure nitrogen gas pipe network so as to improve the high-pressure nitrogen gas amount of the air separation equipment.
This increase device of air separation plant nitrogen gas tolerance on original air separation plant's basis, increases a small amount of equipment and can improve air separation plant's high-pressure nitrogen gas tolerance, makes single set of air separation plant can satisfy the load needs of urea production, avoids two sets of air separation plant operations to cause the energy extravagant.
The foregoing description of the embodiments of the invention has been presented for purposes of illustration and not limitation, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the illustrated embodiments.
Claims (4)
1. The utility model provides an increase device of air separation plant nitrogen gas tolerance, the device includes the air separation plant body, and the air separation plant body includes liquid nitrogen storage tank, high-pressure nitrogen gas pipe network, and its characterized in that, the device still include reciprocating type cryopump, water bath vaporizer, and the liquid outlet of liquid nitrogen storage tank links to each other through reciprocating type cryopump and water bath vaporizer's high-pressure liquid nitrogen import, and water bath vaporizer's nitrogen outlet links to each other with high-pressure nitrogen gas pipe network.
2. The device for increasing the nitrogen gas volume of the air separation plant according to claim 1, characterized in that: two reciprocating cryogenic pumps are arranged in parallel.
3. The apparatus for increasing the nitrogen gas amount of an air separation plant according to claim 1 or 2, characterized in that: the return pipeline of the reciprocating cryogenic pump is connected to the emptying pipe of the liquid nitrogen storage tank.
4. The device for increasing the nitrogen gas volume of the air separation plant according to claim 1, characterized in that: the water bath type vaporizer takes low-pressure steam as a heat exchange medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121026680.6U CN214892167U (en) | 2021-05-13 | 2021-05-13 | Device for increasing nitrogen gas amount of air separation equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121026680.6U CN214892167U (en) | 2021-05-13 | 2021-05-13 | Device for increasing nitrogen gas amount of air separation equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214892167U true CN214892167U (en) | 2021-11-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202121026680.6U Active CN214892167U (en) | 2021-05-13 | 2021-05-13 | Device for increasing nitrogen gas amount of air separation equipment |
Country Status (1)
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| CN (1) | CN214892167U (en) |
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2021
- 2021-05-13 CN CN202121026680.6U patent/CN214892167U/en active Active
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