CN219415429U - System for optimizing driving time of internal compression oxygen generation system - Google Patents
System for optimizing driving time of internal compression oxygen generation system Download PDFInfo
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- CN219415429U CN219415429U CN202320275141.9U CN202320275141U CN219415429U CN 219415429 U CN219415429 U CN 219415429U CN 202320275141 U CN202320275141 U CN 202320275141U CN 219415429 U CN219415429 U CN 219415429U
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Abstract
The utility model relates to a driving time optimization system of an internal compression oxygen generation system, which comprises the following components: the molecular sieve purifier pressurizing optimizing structure is connected with the molecular sieve purifier to optimize the pressurizing mode of the molecular sieve purifier; the single body heating optimizing structure of the booster turbine expander is connected with the expander, and optimizes the single body heating mode of the expander to ensure that the dew point of the gas in the equipment is qualified; the cold state gas guide optimizing structure of the rectifying tower is connected with the inlet tower of the internal compression oxygen generating system, optimizes the cold state gas guide mode of the rectifying tower, and ensures the low-load normal operation of the rectifying tower. The utility model can effectively shorten the starting time of the internal compression oxygen generation system, reduce the driving cost of the system and avoid the risk of system parking. The utility model can be applied in the field of air separation equipment.
Description
Technical Field
The utility model relates to the technical field of air separation equipment, in particular to a driving time optimization system of an internal compression oxygen generation system.
Background
At present, an air separation device is equipment for gradually separating and producing gas products such as oxygen, nitrogen, argon and the like from air by taking air as a raw material through the steps of cooling, purifying, liquefying, rectifying and the like, and in the air separation technology, a process of directly producing high-pressure oxygen from the air separation equipment to supply the high-pressure oxygen to a user is called an internal compression process.
The existing internal compression process mainly comprises the steps of air compression, air precooling, molecular sieve purification, refrigeration by a booster turbine expander and rectification separation. The problems involved in the current start-up procedure mainly include long pressurization time of a molecular sieve purifier, slower cold air guide process of a rectifying tower, qualified dew point of seal air needed in the early stage of starting a booster turbine expander, delayed monomer heating and the like, so that development of a method for optimizing the start-up time of an internal compression oxygen production system is needed.
Disclosure of Invention
Aiming at the problems, the utility model aims to provide a driving time optimization system of an internal pressure oxygen generation system, which can effectively shorten the starting time of the internal pressure oxygen generation system, reduce the driving cost of the system and avoid the risk of system parking.
In order to achieve the above purpose, the present utility model adopts the following technical scheme: a system for optimizing start-up time of an internal compression oxygen generation system, comprising:
the molecular sieve purifier pressurizing optimizing structure is connected with the molecular sieve purifier to optimize the pressurizing mode of the molecular sieve purifier;
the single body heating optimizing structure of the booster turbine expander is connected with the expander, and optimizes the single body heating mode of the expander to ensure that the dew point of the gas in the equipment is qualified;
the cold state gas guide optimizing structure of the rectifying tower is connected with the inlet tower of the internal compression oxygen generating system, optimizes the cold state gas guide mode of the rectifying tower, and ensures the low-load normal operation of the rectifying tower.
Further, the molecular sieve purifier pressurization optimizing structure comprises a pressurization valve;
the two ends of the pressurizing valve at the inlet of each molecular sieve purifier are connected in parallel with one pressurizing valve; pressurizing the two molecular sieve purifiers by the pressurizing valves and the outlet butterfly valves of the two molecular sieve purifiers.
Further, the single body heating optimizing structure of the booster turbine expander comprises: sealing the gas line and the shunt line;
the sealing gas pipeline is connected between the two expansion machines and is connected with the nitrogen pump through the sealing gas pipeline, and clean nitrogen is input into the expansion machines;
the split-flow pipeline is arranged on the sealed air pipeline, and the single body heating is carried out on the expander through the sealed air pipeline and the split-flow pipeline.
Further, a control main valve is arranged between the sealing gas pipeline and the nitrogen pump.
Further, the shunt pipeline isStainless steel tube.
Further, a branch valve is arranged on the shunt pipeline.
Further, the cold state air guide optimizing structure of the rectifying tower comprises a DN300 bypass regulating valve;
and the DN300 bypass regulating valve is connected in parallel with two ends of a DN600 big valve of the tower inlet of the internal pressure oxygen generating system, so that the DN600 big valve is provided with double bypasses.
Due to the adoption of the technical scheme, the utility model has the following advantages:
the utility model optimizes the pressurizing mode of the molecular sieve purifier, the cold air guiding mode of the rectifying tower and the monomer heating mode of the pressurizing turbine expander, effectively shortens the starting time of the internal compression oxygen generating system, reduces the system starting cost, can ensure the stable operation of the system under the condition of the failure of the air valve of the inlet tower, and avoids the risk of system stopping.
Drawings
FIG. 1 is a schematic diagram of a driving time optimizing system of an internal compression oxygen generating system in an embodiment of the utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which are obtained by a person skilled in the art based on the described embodiments of the utility model, fall within the scope of protection of the utility model.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
In one embodiment of the present utility model, as shown in FIG. 1, a method for optimizing the start-up time of an internal pressure oxygen generating system is provided. In the embodiment, the method is used for optimizing the starting time of the internal compression oxygen generating system, specifically,
in this embodiment, since there is only one DN600 big valve and one DN150 bypass hand valve in the inlet tower of the internal compression oxygen generation system in the prior art, the system is operated by bypassing DN150 hand valve during the front-stage rectification tower gas guide. After a plurality of times of cold driving, the lower tower pressurization needs (the majority of the lower tower pressurization needs are liquefied after the lower tower pressurization needs enter the lower tower through the bypass hand valve, and the pressure cannot be filled), at the moment, the air needs to be opened to enter the lower tower large valve, but the air passage is not easy to control, and the system pressure fluctuation and the lower tower overpressure are easily caused. Therefore, in the embodiment, a DN300 bypass regulating valve is additionally arranged on the basis of the original tower inlet large valve bypass DN150, cold state stable driving can be realized through the DN300 bypass self-regulating valve, meanwhile, the situation that the tower inlet large valve is closed due to fault is met, and through the use of the DN300 and DN150 double bypasses, the low-load normal operation of the rectifying tower can be ensured, and the risk of system shutdown is avoided.
In one embodiment of the present utility model, a system for optimizing the start-up time of an internal compression oxygen generation system is provided. In this embodiment, as shown in fig. 1, the system includes:
the molecular sieve purifier pressurizing optimizing structure is connected with the molecular sieve purifier, optimizes the pressurizing mode of the molecular sieve purifier and shortens the pressurizing time of the molecular sieve purifier;
the single body heating optimizing structure of the booster turbine expander is connected with the expander, and when the pressurization is finished, the molecular sieve purifier operates normally, so that the single body heating mode of the expander is optimized, and the gas dew point in the equipment is ensured to be qualified;
the cold state gas guide optimizing structure of the rectifying tower is connected with the inlet tower of the internal compression oxygen generating system, optimizes the cold state gas guide mode of the rectifying tower when the dew point of the gas in the equipment is qualified, ensures the low-load normal operation of the rectifying tower, and realizes the stable driving of the cold state.
In the above embodiment, the molecular sieve purifier pressurization optimization structure includes a pressurization valve. Two ends of the pressurizing valves at the inlets of the two molecular sieve purifiers are respectively connected with one pressurizing valve in parallel; two ends of a pressurizing valve at the inlet of each molecular sieve purifier are connected in parallel with one pressurizing valve; pressurizing the two molecular sieve purifiers by the pressurizing valves and the outlet butterfly valves of the two molecular sieve purifiers.
When the device is used, the pressurizing valves and the outlet butterfly valves of the two molecular sieve purifiers are simultaneously opened, so that the two molecular sieve purifiers are pressurized simultaneously.
In the above embodiment, the single-body heating optimizing structure of the booster turbine expander comprises a seal gas pipeline and a shunt pipeline. The sealing gas pipeline is connected between the two expansion machines and is connected with the nitrogen pump through the sealing gas pipeline, and clean nitrogen is input into the expansion machines; and a shunt pipeline is arranged on the sealed air pipeline, and the single body of the expander is heated through the sealed air pipeline and the shunt pipeline.
When the device is used, a sealing gas pipeline is introduced between the two expansion machines, and clean nitrogen is input through the sealing gas pipeline; the sealed gas pipeline and the shunt pipeline are used for heating the single body of the expander, so that the temperature is not limited by the dew point of the medium pumping source, and the starting time is shortened.
In this embodiment, clean nitrogen is provided by a nitrogen pump; after the nitrogen pump passes through the heat exchanger, the pressure is reduced to 1.0MPa of clean nitrogen.
Preferably, a control main valve is arranged between the sealing gas pipeline and the nitrogen pump; the split-flow pipeline isThe stainless steel pipe is made, is provided with the branch valve on the shunt pipeline, can realize carrying out the monomer heating in advance to the expander through the shunt pipeline, can realize the branch unit through the branch valve and use, two units are not influenced each other.
In the above embodiment, the cold air guiding optimization structure of the rectifying tower comprises a DN300 bypass regulating valve. And two ends of a DN600 big valve of the internal pressure oxygen generating system entering the tower are connected with DN300 bypass regulating valves in parallel, so that the DN600 big valve is provided with double bypasses. The cold state stable driving is realized through the DN300 bypass regulating valve; when the large valve of the tower inlet is closed due to faults, a double bypass formed by the DN300 bypass regulating valve and the original bypass DN150 hand valve of the internal pressure oxygen generating system of the tower inlet ensures the low-load normal operation of the rectifying tower.
In summary, when the utility model is used, the specific working process comprises the following steps:
1) Optimizing the pressurizing mode of the molecular sieve purifier, shortening the pressurizing time of the molecular sieve purifier, and further shortening the driving time of the internal compression oxygen production system and the whole rear system;
2) After the pressurization is finished, the molecular sieve purifier operates normally, and the heating mode of the expander monomer is optimized to ensure that the dew point of the gas in the equipment is qualified;
3) And when the dew point of the gas in the equipment is qualified, the cold gas guide mode of the rectifying tower is optimized, so that the low-load normal operation of the rectifying tower is ensured, and the cold stable driving is realized.
The utility model can effectively shorten the starting time of the internal compression oxygen generation system, reduce the system driving cost, ensure the stable operation of the system under the condition of the failure of the air inlet valve and avoid the risk of system stopping.
In the step 1), the optimization of the pressurizing mode of the molecular sieve purifier comprises the following steps:
1.1 Two ends of the pressurizing valves at the inlets of the two molecular sieve purifiers are respectively connected with one pressurizing valve in parallel, so that the molecular sieve purifiers are pressurized in advance;
1.2 The pressurizing valves and the outlet butterfly valves of the two molecular sieve purifiers are opened simultaneously, so that the pressurizing of the two molecular sieve purifiers is realized simultaneously, and the pressurizing time is shortened.
Because the molecular sieve is operated in a mode of pressurizing by a single molecular sieve after entering a start-up procedure, the whole pressurizing time is about 1.5 hours, and the pressurizing time is longer. According to the embodiment, the pressurizing valves and the outlet butterfly valves of the two molecular sieves are opened simultaneously, so that the pressurizing time of the two molecular sieve purifiers is shortened to 0.67 hour, and compared with the previous pressurizing mode through a single molecular sieve, the pressurizing time of the molecular sieves can be shortened by about 0.83 hour, and then the driving time of the internal pressure oxygen production system and the whole rear system is shortened.
Meanwhile, in the embodiment, the molecular sieve purifier is pressurized normally in advance, so that instrument air and factory air can be supplied in advance, an instrument air compressor can be stopped in advance, and the electric quantity consumption is reduced.
In the step 2), the optimization of the heating mode of the expander monomer comprises the following steps:
2.1 Introducing a seal gas line between the two expanders, through which clean nitrogen is fed;
2.2 The split-flow pipeline is arranged on the sealed air pipeline, the single body of the expander is heated through the sealed air pipeline and the split-flow pipeline, the limitation of the dew point of the medium pumping source is avoided, and the starting time is shortened.
In the embodiment, the whole equipment is required to be heated singly before the booster turbine expander is started so as to ensure that the dew point of the internal gas is qualified. The first step of monomer heating is to use sealing gas, wherein the sealing gas is pumping air in a supercharger in the prior art, the dew point of the air source in the way is unqualified before the internal compression oxygen generating system is started, and the air source can be qualified after being purged for 2 hours, which is equivalent to at least 2 hours after the starting time of the expander. In this embodiment, a standby gas source is added, and the nitrogen pump is used to pump clean nitrogen gas which is depressurized to 1.0MPa after the heat exchanger, and the nitrogen pump is introducedThe stainless steel pipe is branched to the sealing gas pipeline of the expander and is provided with a main valve and a branch valve, and the single body of the expander is heated by using the flow path. After the method is adopted, the single body heating of the booster turbine expander is not limited by the dew point of the medium extraction source, the starting time can be advanced by at least 2 hours, the starting time of the internal compression oxygen production system and the whole rear system is further shortened, meanwhile, products are produced in advance, the consumption and the time of using clean nitrogen by the rear system are reduced, and the starting cost of the whole system is reduced.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (7)
1. A system for optimizing start-up time of an internal compression oxygen generation system, comprising:
the molecular sieve purifier pressurizing optimizing structure is connected with the molecular sieve purifier to optimize the pressurizing mode of the molecular sieve purifier;
the single body heating optimizing structure of the booster turbine expander is connected with the expander, and optimizes the single body heating mode of the expander to ensure that the dew point of the gas in the equipment is qualified;
the cold state gas guide optimizing structure of the rectifying tower is connected with the inlet tower of the internal compression oxygen generating system, optimizes the cold state gas guide mode of the rectifying tower, and ensures the low-load normal operation of the rectifying tower.
2. The internal compression oxygen generation system start-up time optimization system of claim 1, wherein the molecular sieve purifier pressurization optimization structure comprises a pressurization valve;
the two ends of the pressurizing valve at the inlet of each molecular sieve purifier are connected in parallel with one pressurizing valve; pressurizing the two molecular sieve purifiers by the pressurizing valves and the outlet butterfly valves of the two molecular sieve purifiers.
3. The internal compression oxygen generation system start-up time optimization system of claim 1, wherein the pressurized turbo expander monomer warming optimization structure comprises a seal gas line and a shunt line;
the sealing gas pipeline is connected between the two expansion machines and is connected with the nitrogen pump through the sealing gas pipeline, and clean nitrogen is input into the expansion machines;
the split-flow pipeline is arranged on the sealed air pipeline, and the single body heating is carried out on the expander through the sealed air pipeline and the split-flow pipeline.
4. A start-up time optimization system for an internal compression oxygen generation system as set forth in claim 3, wherein a control master valve is provided between said seal gas line and the nitrogen pump.
5. The internal compression oxygen generation system start-up time optimization system of claim 3, wherein the split line isStainless steel tube.
6. A start-up time optimization system for an internal compression oxygen generating system as recited in claim 3, wherein a branch valve is provided on the shunt line.
7. The internal compression oxygen generation system start-up time optimization system of claim 1, wherein the rectification column cold air guide optimization structure comprises a DN300 bypass regulating valve;
and the DN300 bypass regulating valve is connected in parallel with two ends of a DN600 big valve of the tower inlet of the internal pressure oxygen generating system, so that the DN600 big valve is provided with double bypasses.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320275141.9U CN219415429U (en) | 2023-02-21 | 2023-02-21 | System for optimizing driving time of internal compression oxygen generation system |
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| CN202320275141.9U CN219415429U (en) | 2023-02-21 | 2023-02-21 | System for optimizing driving time of internal compression oxygen generation system |
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