CN209801920U - Device for prolonging operation period of air separation device - Google Patents
Device for prolonging operation period of air separation device Download PDFInfo
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- CN209801920U CN209801920U CN201920463652.7U CN201920463652U CN209801920U CN 209801920 U CN209801920 U CN 209801920U CN 201920463652 U CN201920463652 U CN 201920463652U CN 209801920 U CN209801920 U CN 209801920U
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Abstract
A device for prolonging the operation cycle of an air separation device comprises an expansion machine, wherein the expansion machine comprises a supercharging end and an expansion end, the supercharging end is provided with a supercharging end inlet pipeline, the supercharging end inlet pipeline is connected with the supercharging end and an outlet of the four sections of a supercharger, the supercharging end is also provided with a supercharging end outlet pipeline, the supercharging end outlet pipeline is provided with an after cooler, and the supercharging end outlet pipeline is connected with the supercharging end and a rectifying tower; an expansion end inlet pipeline is arranged on the expansion end, one end of the expansion end inlet pipeline is connected with the expansion end, the other end of the expansion end inlet pipeline is connected to a supercharging end inlet pipeline position close to the four-section outlet of the supercharger, an expansion end outlet pipeline is also arranged on the expansion end, and the expansion end outlet pipeline is connected with the expansion end and the rectifying tower; and the outlet pipeline of the pressurization end and the inlet pipeline of the expansion end both pass through the plate-fin heat exchanger. By adopting the structure, the problem that the interlocking shutdown is caused by the load adjustment or the fault occurrence of the expansion machine can be solved, the operation period of the air separation device is prolonged, and the whole system of the air separation device can normally operate for a long time.
Description
Technical Field
The utility model relates to a silverware production and processing field, especially a device of extension air separation plant operating cycle.
Background
The cryogenic process uses air as raw material, uses an expander to refrigerate so as to make an air separation device maintain low temperature, liquefies the air separation, and prepares high-purity oxygen and nitrogen in a rectifying tower by a cryogenic rectification method, thereby meeting the requirements of chemical industry, metallurgy, glass and high-tech industries on gas.
Because of the influence of the post-process related to the air separation plant, the air separation plant often needs to be adjusted, and in the process of adjusting the load, or in the mechanical, instrument and electrical aspects, the expander is shut down in an interlocking way for various reasons, and the reasons that the expander is shut down in an interlocking way are as follows: (1) when the load of the expansion machine is adjusted under variable working conditions, the rotating speed can be adjusted at the same time, and if the runaway overspeed occurs, the expansion machine can be stopped in an interlocking manner; (2) mechanical failure of the expander, ultrahigh shaft vibration; (3) the temperature of the bearing bush is ultrahigh; (4) the oil temperature is too high; (5) the oil pressure is too low; (6) the control valve for preventing surge of the expansion machine is in failure.
The aim of the operation management of the large air separation device is to operate safely, stably, high-quality, efficiently and periodically. Preliminary estimate of oxygen content in a plant for the synthesis of ammonia, 80000Nm for a set of products3The air separation device is shut down once in the whole system, and the direct economic loss of the shut-down of the subsequent work section is between 100 and 300 ten thousand yuan.
Generally, the expansion machine fault interlocking shutdown can cause the booster compressor, the air compressor interlocking shutdown and the air separation unit full system shutdown, but by adding a material channel, an automatic valve, a brand new automatic control method and the like, when the expansion machine carries out load adjustment or the expansion machine fails to cause the interlocking shutdown, the booster compressor, the air compressor and the full system can still be ensured not to be stopped, but if the expansion machine is stopped for too long time, the air separation unit can be abnormally operated due to insufficient cooling capacity supplied by the system or the full system shutdown can be caused.
disclosure of Invention
The utility model aims to solve the technical problem that a device of extension air separation plant cycle is provided, can solve expander adjustment load or break down, when leading to the interlocking to shut down, extension air separation plant cycle makes the long-time normal operating of air separation plant overall system ability.
in order to solve the technical problem, the utility model discloses the technical scheme who adopts is: a device for prolonging the operation cycle of an air separation device comprises an expansion machine, wherein the expansion machine comprises a supercharging end and an expansion end, the supercharging end is provided with a supercharging end inlet pipeline, the supercharging end inlet pipeline is connected with the supercharging end and an outlet of the four sections of a supercharger, the supercharging end is also provided with a supercharging end outlet pipeline, the supercharging end outlet pipeline is provided with an after cooler, and the supercharging end outlet pipeline is connected with the supercharging end and a rectifying tower;
the expansion end is provided with an expansion end inlet pipeline, one end of the expansion end inlet pipeline is connected with the expansion end, the other end of the expansion end inlet pipeline is connected to a supercharging end inlet pipeline position close to the four-section outlet of the supercharger, the expansion end is also provided with an expansion end outlet pipeline, and the expansion end outlet pipeline is connected with the expansion end and the rectifying tower;
And the outlet pipeline of the supercharging end and the inlet pipeline of the expansion end both penetrate through the plate-fin heat exchanger.
In the preferred scheme, an anti-surge pipeline is further arranged on the inlet pipeline of the supercharging end, one end of the anti-surge pipeline is connected with the inlet pipeline of the supercharging end, and the other end of the anti-surge pipeline is connected with the outlet pipeline of the supercharging end.
In a preferable scheme, an anti-surge valve is arranged on the anti-surge pipeline.
In the preferred scheme, a supercharging end bypass pipeline is further arranged on the supercharging end inlet pipeline, one end of the supercharging end bypass pipeline is connected with the supercharging end inlet pipeline, and the other end of the supercharging end bypass pipeline is connected with the supercharging end outlet pipeline.
In a preferable scheme, a supercharging end bypass valve is arranged on the supercharging end bypass pipeline.
In the preferred scheme, an inlet check valve is arranged on the inlet pipeline of the pressurization end, the connecting position of the inlet pipeline of the expansion end and the inlet pipeline of the pressurization end is positioned on the inlet pipeline of the pressurization end at one end of the inlet check valve, and the connecting position of the anti-surge pipeline, the bypass pipeline of the pressurization end and the inlet pipeline of the pressurization end is positioned on the inlet pipeline of the pressurization end at the other end of the inlet check valve.
In a preferable scheme, a stop valve and an outlet check valve are arranged on the pressure charging end outlet pipeline;
the shut-off valve is arranged on the boosting end outlet pipeline between the connection point of the anti-surge pipeline and the boosting end outlet pipeline and the connection point of the boosting end bypass pipeline and the boosting end outlet pipeline;
The outlet check valve is arranged on the outlet pipeline of the pressurizing end close to the rectifying tower.
In a preferable scheme, an expansion end bypass pipeline for connecting the expansion end inlet pipeline and the expansion end outlet pipeline is further arranged between the expansion end inlet pipeline and the expansion end outlet pipeline, and an expansion end bypass valve is arranged on the expansion end bypass pipeline.
In a preferable scheme, a quick-closing valve is arranged on the inlet pipeline of the expansion end, and the quick-closing valve is arranged at the inlet pipeline position of the expansion end close to the expansion end.
In the preferred scheme, a liquid nitrogen recharging pipeline connected with the tank area is arranged on the rectifying tower, and a liquid nitrogen recharging adjusting valve is arranged on the liquid nitrogen recharging pipeline.
The utility model provides an extension air separation plant cycle's device through adopting above-mentioned structure, has following beneficial effect:
(1) After the material channel, the valve and the like are newly added and modified, the economic loss caused by stopping and driving can be avoided, and great profit is created for company production;
(2) The air separation device is at the in-process of stopping, driving, and often the safety risk is higher than when normal operation, is the peak period that the accident took place, through newly increasing material passageway and valve etc. transformation back, can effectively avoid because of the safety risk that the in-process of stopping, driving easily caused.
drawings
The invention will be further explained with reference to the following figures and examples:
Fig. 1 is a schematic view of the overall structure of the present invention.
in the figure: the four-section outlet 1 of the supercharger, a supercharging end 2, an expansion end 3, a supercharging end inlet pipeline 4, an aftercooler 5, a supercharging end outlet pipeline 6, an expansion end inlet pipeline 7, an expansion end outlet pipeline 8, a plate-fin heat exchanger 9, a rectifying tower 10, an anti-surge pipeline 11, a supercharging end bypass pipeline 12, an inlet check valve 13, a cut-off valve 14, an outlet check valve 15, an expansion end bypass pipeline 16, a quick-closing valve 17, an anti-surge valve 18, a supercharging end bypass valve 19, an expansion end bypass valve 20, a liquid nitrogen recharging pipeline 21 and a liquid nitrogen recharging adjusting valve 22.
Detailed Description
As shown in fig. 1, the device for prolonging the operation cycle of the air separation plant comprises an expander, wherein the expander comprises a pressurizing end 2 and an expansion end 3, a pressurizing end inlet pipeline 4 is arranged on the pressurizing end 2, the pressurizing end inlet pipeline 4 is connected with the pressurizing end 2 and an outlet 1 of the four sections of the supercharger, a pressurizing end outlet pipeline 6 is also arranged on the pressurizing end 2, an after cooler 5 is arranged on the pressurizing end outlet pipeline 6, and the pressurizing end outlet pipeline 6 is connected with the pressurizing end 2 and a rectifying tower 10;
An expansion end inlet pipeline 7 is arranged on the expansion end 3, one end of the expansion end inlet pipeline 7 is connected with the expansion end 3, the other end of the expansion end inlet pipeline 7 is connected to a pressurizing end inlet pipeline 4 close to the four-section outlet 1 of the supercharger, an expansion end outlet pipeline 8 is further arranged on the expansion end 3, and the expansion end outlet pipeline 8 is connected with the expansion end 3 and the rectifying tower 10;
And the pressurizing end outlet pipeline 6 and the expansion end inlet pipeline 7 both pass through the plate-fin heat exchanger 9.
In a preferable scheme, an anti-surge pipeline 11 is further arranged on the inlet pipeline 4 of the pressurizing end, one end of the anti-surge pipeline 11 is connected with the inlet pipeline 4 of the pressurizing end, and the other end of the anti-surge pipeline is connected with the outlet pipeline 6 of the pressurizing end.
In a preferred scheme, an anti-surge valve 18 is arranged on the anti-surge pipeline 11.
In a preferable scheme, a pressurizing end bypass pipeline 12 is further arranged on the pressurizing end inlet pipeline 4, one end of the pressurizing end bypass pipeline 12 is connected with the pressurizing end inlet pipeline 4, and the other end of the pressurizing end bypass pipeline 12 is connected with the pressurizing end outlet pipeline 6.
In a preferred scheme, a supercharging end bypass valve 19 is arranged on the supercharging end bypass pipeline 12.
in a preferable scheme, an inlet check valve 13 is arranged on the pressurizing end inlet pipeline 4, the connecting position of the expansion end inlet pipeline 7 and the pressurizing end inlet pipeline 4 is positioned on the pressurizing end inlet pipeline 4 at one end of the inlet check valve 13, and the connecting position of the anti-surge pipeline 11, the pressurizing end bypass pipeline 12 and the pressurizing end inlet pipeline 4 is positioned on the pressurizing end inlet pipeline 4 at the other end of the inlet check valve 13.
In a preferable scheme, a shut-off valve 14 and an outlet check valve 15 are arranged on the pressurizing end outlet pipeline 6;
The shut-off valve 14 is arranged on the pressurization end outlet pipeline 6 between the connection point of the anti-surge pipeline 11 and the pressurization end outlet pipeline 6 and the connection point of the pressurization end bypass pipeline 12 and the pressurization end outlet pipeline 6;
An outlet check valve 15 is provided at a position close to the pressurizing end outlet line 6 of the rectifying column 10.
In a preferable scheme, an expansion end bypass pipeline 16 for connecting the expansion end inlet pipeline 7 and the expansion end outlet pipeline 8 is further arranged between the expansion end inlet pipeline 7 and the expansion end outlet pipeline 8, and an expansion end bypass valve 20 is arranged on the expansion end bypass pipeline 16.
In a preferred scheme, a quick-closing valve 17 is arranged on the expansion end inlet pipeline 7, and the quick-closing valve 17 is arranged at the position of the expansion end inlet pipeline 7 close to the expansion end 3.
in the preferred scheme, a liquid nitrogen recharging pipeline 21 connected with the tank area is arranged on the rectifying tower 10, and a liquid nitrogen recharging regulating valve 22 is arranged on the liquid nitrogen recharging pipeline 21.
The working principle of the device is as follows:
under the normal working condition of the expansion machine, a part of compressed air (with the pressure of 5.0 MPa) from an outlet 1 of the four sections of the supercharger enters a supercharging end 2 of the expansion machine through a supercharging end inlet check valve 13 and a supercharging end inlet pipeline 4, the compressed air passes through an aftercooler 5 after being supercharged to 7.0MPa and then reaches a plate-fin heat exchanger 9 through a supercharging end outlet pipeline 6 to realize heat exchange, and finally reaches a rectifying tower 10, and the other part of compressed air enters the plate-fin heat exchanger 9 to exchange heat and then enters an expansion end 3 of the expansion machine through an expansion end inlet quick-closing valve 17 and an expansion end inlet pipeline 7, and reaches the rectifying tower 10 through an expansion end outlet pipeline 8 after being expanded and cooled.
When the expander fails, the expander can be immediately interlocked, the quick-closing valve 17 on the inlet pipeline 7 at the expansion end of the expander is quickly closed, the bypass valve 20 on the bypass pipeline 16 at the expansion end is fully opened, the cut-off valve 14 on the outlet pipeline 6 at the supercharging end is closed, the anti-surge valve 18 on the anti-surge pipeline 11 is fully opened, the bypass valve 19 on the bypass pipeline 12 at the supercharging end is fully opened, at the moment, the expander loses power, the rotating speed is quickly reduced to zero, the gas at the outlet of the supercharging end flows back through the anti-surge valve 18, the interlocking shutdown process of the expander is completed, one part of the compressed air at the outlet 1 of the four sections of the supercharger passes through the bypass pipeline 12 at the supercharging end, smoothly and unimpededly passes through the plate-fin heat exchanger 9 and finally reaches the rectifying tower, and the other part of the compressed air passes through the bypass pipeline 16 at the expansion end and.
Because the expander stops, the flow of the channel at the expansion end is reduced by about 40 percent, the cold energy of the system is reduced, the heat exchange working condition of the plate-fin heat exchanger 9 of the air separation device and the working condition of the rectifying tower can be changed to a certain extent, at the moment, a certain amount of finished liquid nitrogen can be back-filled to the upper part of the rectifying tower 10 from the tank area through the liquid nitrogen back-filling pipeline 21 by the liquid nitrogen back-filling regulating valve so as to compensate the reduction of the cold energy of the system caused by the stop of the expander, balance the cold energy of the system and maintain the normal operation of the.
Claims (10)
1. The utility model provides a device of extension air separation plant operating cycle, includes the expander, characterized by: the expansion machine comprises a pressurization end (2) and an expansion end (3), wherein a pressurization end inlet pipeline (4) is arranged on the pressurization end (2), the pressurization end inlet pipeline (4) is connected with the pressurization end (2) and a four-section outlet (1) of the supercharger, a pressurization end outlet pipeline (6) is also arranged on the pressurization end (2), a rear cooler (5) is arranged on the pressurization end outlet pipeline (6), and the pressurization end outlet pipeline (6) is connected with the pressurization end (2) and the rectifying tower (10);
An expansion end inlet pipeline (7) is arranged on the expansion end (3), one end of the expansion end inlet pipeline (7) is connected with the expansion end (3), the other end of the expansion end inlet pipeline is connected to a supercharging end inlet pipeline (4) close to the four-section outlet (1) of the supercharger, an expansion end outlet pipeline (8) is further arranged on the expansion end (3), and the expansion end outlet pipeline (8) is connected with the expansion end (3) and the rectifying tower (10);
and the supercharging end outlet pipeline (6) and the expansion end inlet pipeline (7) both penetrate through the plate-fin heat exchanger (9).
2. an apparatus for extending the operating cycle of an air separation plant as defined in claim 1, wherein: the pressure boost end inlet pipeline (4) on still be equipped with anti-surge pipeline (11), anti-surge pipeline (11) one end is connected with pressure boost end inlet pipeline (4), the other end is connected with pressure boost end outlet pipeline (6).
3. An apparatus for extending the operating cycle of an air separation plant as defined in claim 2, wherein: an anti-surge valve (18) is arranged on the anti-surge pipeline (11).
4. An apparatus for extending the operating cycle of an air separation plant as defined in claim 2, wherein: the pressure boost end inlet pipeline (4) is also provided with a pressure boost end bypass pipeline (12), one end of the pressure boost end bypass pipeline (12) is connected with the pressure boost end inlet pipeline (4), and the other end of the pressure boost end bypass pipeline is connected with the pressure boost end outlet pipeline (6).
5. An apparatus for extending the operating cycle of an air separation plant as defined in claim 4, wherein: and a supercharging end bypass valve (19) is arranged on the supercharging end bypass pipeline (12).
6. An apparatus for extending the operating cycle of an air separation plant as defined in claim 4, wherein: the pressure boost end inlet pipeline (4) on be equipped with import check valve (13), the hookup location of expansion end inlet pipeline (7) and pressure boost end inlet pipeline (4) is located pressure boost end inlet pipeline (4) of import check valve (13) one end, the hookup location of anti-surge pipeline (11), pressure boost end bypass line (12) and pressure boost end inlet pipeline (4) is located pressure boost end inlet pipeline (4) of import check valve (13) other end.
7. An apparatus for extending the operating cycle of an air separation plant as defined in claim 1, wherein: a shut-off valve (14) and an outlet check valve (15) are arranged on the pressurizing end outlet pipeline (6);
the shut-off valve (14) is arranged on the pressurizing end outlet pipeline (6) between the connection point of the anti-surge pipeline (11) and the pressurizing end outlet pipeline (6) and the connection point of the pressurizing end bypass pipeline (12) and the pressurizing end outlet pipeline (6);
the outlet check valve (15) is arranged at a position close to the outlet pipeline (6) at the pressurizing end of the rectifying tower (10).
8. an apparatus for extending the operating cycle of an air separation plant as defined in claim 1, wherein: an expansion end bypass pipeline (16) for connecting the expansion end inlet pipeline (7) and the expansion end outlet pipeline (8) is further arranged between the expansion end inlet pipeline (7) and the expansion end outlet pipeline (8), and an expansion end bypass valve (20) is arranged on the expansion end bypass pipeline (16).
9. An apparatus for extending the operating cycle of an air separation plant as defined in claim 8, wherein: and a quick-closing valve (17) is arranged on the expansion end inlet pipeline (7), and the quick-closing valve (17) is arranged at the position of the expansion end inlet pipeline (7) close to the expansion end (3).
10. an apparatus for extending the operating cycle of an air separation plant as defined in claim 1, wherein: and a liquid nitrogen recharging pipeline (21) connected with the tank area is arranged on the rectifying tower (10), and a liquid nitrogen recharging regulating valve (22) is arranged on the liquid nitrogen recharging pipeline (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920463652.7U CN209801920U (en) | 2019-04-08 | 2019-04-08 | Device for prolonging operation period of air separation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920463652.7U CN209801920U (en) | 2019-04-08 | 2019-04-08 | Device for prolonging operation period of air separation device |
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| Publication Number | Publication Date |
|---|---|
| CN209801920U true CN209801920U (en) | 2019-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920463652.7U Active CN209801920U (en) | 2019-04-08 | 2019-04-08 | Device for prolonging operation period of air separation device |
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| CN (1) | CN209801920U (en) |
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- 2019-04-08 CN CN201920463652.7U patent/CN209801920U/en active Active
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