CN217370920U - Nitrogen making unit gas supply system based on pressure, flow and purity control - Google Patents
Nitrogen making unit gas supply system based on pressure, flow and purity control Download PDFInfo
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- CN217370920U CN217370920U CN202220086404.7U CN202220086404U CN217370920U CN 217370920 U CN217370920 U CN 217370920U CN 202220086404 U CN202220086404 U CN 202220086404U CN 217370920 U CN217370920 U CN 217370920U
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Abstract
The invention provides a nitrogen making unit gas supply system based on pressure, flow and purity control, which comprises: the air source enters the nitrogen making unit, and the control system controls the nitrogen making unit to generate nitrogen; and the control system controls the opening, closing and angles of the adjusting type electric valve I and the adjusting type electric valve II according to the pressure, purity and flow rate of the nitrogen loop between the nitrogen making unit and the terminal gas using system, so as to control the gas inlet flow and the gas outlet purity of the nitrogen making unit. According to the invention, the opening size of the regulating type electric valve I is controlled according to the feedback flow, and the opening angle of the regulating type electric valve I ranges from 0% to 100% in percentage. According to the change of the actual gas consumption of the user in the use process, the size is monitored by the flowmeter, the opening angle of the adjusting type electric valve I is adjusted according to the feedback of data, so that the energy-saving effect is achieved, the opening and closing angle of the adjusting type electric valve II is opened through the PLC, and the purity is stabilized at a required value.
Description
Technical Field
The invention relates to the technical field of gas supply of laser cutting machines, in particular to a method and a system for controlling gas supply of a nitrogen production unit based on pressure, flow and purity.
Background
The applicant provides a method and a system for controlling the air supply of a membrane type nitrogen generator (an authorization notice number CN110480160B, hereinafter referred to as an original scheme) based on pressure and flow in 2019, 9, 30, and the key point of the PLC control lies in the integral linkage of a flow meter and a pressure sensor, so that the whole system can run in a matched mode and achieve effective energy conservation. The method comprises the steps of starting and stopping equipment, opening and closing a valve, adjusting the flow and adjusting the pressure.
Further research on the above "original scheme" by the applicant finds that the following defects still exist: in the using process, how a user can obtain the pressure value (interval) of the nitrogen required by the terminal gas utilization system according to the purity (interval) of the required nitrogen so that the purity is stabilized at a required value and how the actual gas utilization amount is changed, and further improvement is urgently needed in the aspect of achieving the energy-saving effect. Based on this, the applicant proposes a method and a system for controlling the gas supply of a nitrogen generation unit based on pressure, flow and purity.
Disclosure of Invention
The invention aims to provide a method and a system for controlling the gas supply of a nitrogen making unit based on pressure, flow and purity, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
step 1: the air source enters the nitrogen making unit, and the control system controls the nitrogen making unit to generate nitrogen;
and 2, step: and the control system controls the opening, closing and angles of the adjusting type electric valve I and the adjusting type electric valve II according to the pressure, purity and flow control of the nitrogen loop between the nitrogen generating unit and the terminal gas using system, so as to control the gas inlet flow and the gas outlet purity of the nitrogen generating unit.
Preferably, the air source enters the nitrogen making unit through the adjusting type electric valve I, a pressure sensor for detecting the nitrogen gas pressure and a flow meter for detecting the nitrogen gas flow are arranged on a nitrogen loop between the nitrogen making unit and the terminal gas using system, and the pressure sensor and the flow meter are connected with the control system.
Preferably, the control system is based on a PLC control system.
Preferably, a check valve for preventing gas backflow is further arranged on the nitrogen loop, one end of the check valve is connected to the nitrogen making unit, the other end of the check valve is connected to a pressure backup valve for stabilizing the front-end gas outlet pressure, and the pressure backup valve is connected with a pressure sensor in the nitrogen loop.
Preferably, a nitrogen analyzer for monitoring the nitrogen purity is further arranged on the nitrogen loop, and the nitrogen analyzer is connected with the control system.
Preferably, the gas source A enters the nitrogen loop through the adjusting type electric valve II, and the control system controls the opening, closing and angle of the adjusting type electric valve II according to the nitrogen purity of the terminal gas using system.
Preferably, the method for obtaining the air source comprises:
firstly, an air compressor is adopted to take air as an air source;
secondly, dehydrating the obtained gas source by a cold dryer;
and finally, the air source after passing through the cold dryer is heated and connected with an adjusting electric valve I and an adjusting electric valve II.
Preferably, the air compressor, the cold dryer and the heater are connected with a control system.
In order to achieve the above purpose, the invention also provides the following technical scheme:
the utility model provides a nitrogen unit air supply system based on pressure, purity and flow control, includes the nitrogen unit, the nitrogen unit is connected to the terminal gas system of using, is equipped with check valve, pressure-backup valve, pressure sensor, flowmeter and nitrogen gas analysis appearance on the nitrogen gas return circuit that forms between this nitrogen unit and the terminal gas system of using.
Preferably, still include air compressor machine and control system, the air compressor machine is connected with cold machine, heater and the regulation type motorised valve I of doing in order, and this regulation type motorised valve I links to each other with the nitrogen making unit, the nitrogen making unit is connected to the check valve, control system is connected with air compressor machine, cold machine, heater, regulation type motorised valve I, nitrogen making unit, pressure sensor, flowmeter and nitrogen gas analysis appearance respectively.
Preferably, the control system further comprises a regulating type electric valve II controlled by the control system, one end of the regulating type electric valve II is connected with the output end of the cold drying machine, and the other end of the regulating type electric valve II is connected with the output end of the standby pressure valve.
Compared with the prior art, the invention has the beneficial effects that:
according to the system, when the nitrogen making unit equipment is initially started, after the air compressor is started, the contact on the control panel of the nitrogen making unit is started, the equipment starts to work, namely, the PLC control system is used for controlling the adjusting type electric valve I to be in an opening and conducting state, the air compressor sucks air as an air source to provide the air source for the nitrogen making unit, then the nitrogen making unit gradually generates nitrogen until the nitrogen reaches a terminal gas using system, namely the purity (interval) of the nitrogen required by the laser cutting nozzle, and the pressure value (interval) of the nitrogen required by the terminal gas using system can be obtained according to the purity (interval) of the required nitrogen, and then the pressure value (interval) is controlled by the flow meter. According to the gas consumption, the flow meter senses the gas consumption flow and feeds back the gas consumption flow to the PLC control system according to the monitored flow, the PLC controls the opening size of the adjusting type electric valve I according to the feedback flow, and the opening angle of the adjusting type electric valve I ranges from 0% to 100% in percentage. According to the change of the actual gas consumption of a user in the using process, the size is monitored by the flow meter, and the opening angle of the adjusting type electric valve I is adjusted according to the feedback of data, so that the energy-saving effect is achieved. (if there are multiple nitrogen making units, the opening and closing of the single unit or multiple units can be determined according to the gas flow and pressure.) if the purity is higher than the set purity, the opening and closing angle of the adjusting electric valve II is opened through the PLC, so that the purity is stabilized at the required value.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
in the figure: the system comprises an air compressor 1, a cold dryer 2, a heater 3, a regulating type electric valve I4, a nitrogen making unit 5, a one-way valve 6, a back-pressure valve 7, a pressure sensor 8, a regulating type electric valve II 9, a flowmeter 10, a nitrogen analyzer 11, a terminal gas system 12 and a PLC control system 13.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
referring to fig. 1, the present invention provides a technical solution:
a method for supplying gas to a nitrogen-making unit based on pressure, purity and flow control comprises the following steps:
step 1: the air source enters the nitrogen making unit 5, and the control system controls the nitrogen making unit 5 to generate nitrogen;
step 2: the nitrogen generated by the nitrogen generation unit 5 is connected to a terminal gas utilization system 12, and a control system controls the opening, closing and angle of the regulating type electric valve I4 according to the pressure of a nitrogen loop between the nitrogen generation unit and the terminal gas utilization system and the flow control.
And step 3: according to the nitrogen purity required by the terminal gas utilization system, the control system controls the opening, closing and angles of the adjusting type electric valve II 9 according to the detected purity.
In step 1 above: the method for obtaining the air source comprises the following steps:
s100, adopting an air compressor 1 to take air as an air source;
s200, dehydrating the obtained gas source through a cold dryer 2;
and S300, connecting the air source passing through the cold dryer 2 with an adjusting type electric valve I4 through a heater 3.
The air compressor, the cold dryer and the heater are connected with a control system.
The gas source A enters the nitrogen loop through the adjusting electric valve II 9, the control system controls the opening and closing and the angle of the adjusting electric valve II 9 according to the nitrogen purity of the terminal gas system 12, and the gas source A comprises the gas source in the step 300 and oxygen and the like. Air pressure or oxygen is introduced into the regulating type electric valve II 9 for the purpose of stabilizing the purity of the nitrogen gas in the end gas system 12 at a desired value.
In the step 300, the air source passing through the cold dryer 2 is sent to the nitrogen loop through the adjusting type electric valve ii 9, specifically, sent to the output end of the backup pressure valve 7, and used for adjusting the nitrogen purity of the terminal air system 12, where the air source is an air source processed by an air compressor.
In the above step 200: an air source enters a nitrogen making unit 5 through an adjusting type electric valve I4, a pressure sensor 8 for detecting the nitrogen gas pressure and a flow meter 10 for detecting the nitrogen gas flow are arranged on a nitrogen loop between the nitrogen making unit 5 and a terminal gas using system 12, and the pressure sensor 8 and the flow meter 10 are connected with a control system. Still be equipped with the check valve 6 that is used for preventing gas reflux on the nitrogen gas return circuit for stabilize the pressure valve 7 of being equipped with of front end pressure still be equipped with the nitrogen gas analysis appearance 11 that is used for monitoring nitrogen gas purity on the nitrogen gas return circuit, this nitrogen gas analysis appearance 11 is connected with control system.
In the above step 300: and an air source enters the rear end of the pressure preparation valve 7 through a regulating type electric valve II 9.
The invention also provides a nitrogen making unit gas supply system based on pressure, purity and flow control, which comprises a nitrogen making unit 5, wherein the nitrogen making unit 5 is connected to a terminal gas using system 12, and a one-way valve 6, a pressure preparing valve 7, a pressure sensor 8, a flow meter 10 and a nitrogen analyzer 11 are arranged on a nitrogen loop formed between the nitrogen making unit 5 and the terminal gas using system 12.
Specifically, still include air compressor machine 1 and control system, air compressor machine 1 is connected with cold machine 2, heater 3 and the I4 of regulation type motorised valve in order, and this I4 of regulation type motorised valve links to each other with system nitrogen unit 5, system nitrogen unit 5 is connected to check valve 6, control system is connected with air compressor machine 1, cold machine 2, heater 3, regulation type motorised valve I4, system nitrogen unit 5, pressure sensor 8, flowmeter 10 and nitrogen gas analysis appearance 11 respectively.
Specifically, the control system further comprises a regulating type electric valve II 9, wherein one end of the regulating type electric valve II 9 is connected with the output end of the cold drying machine 2, and the other end of the regulating type electric valve II 9 is connected with the output end of the pressure preparation valve 7.
According to the system, when the equipment of the nitrogen making unit 5 is initially started, after the air compressor 1 is started, the contact on the control panel of the nitrogen making unit 5 is started, the equipment starts to work, namely the adjusting type electric valve I4 is controlled to be in an opening and conducting state through the control system, the air compressor 1 sucks air as an air source to provide an air source for the nitrogen making unit 5, then the nitrogen making unit 5 gradually generates nitrogen until the nitrogen reaches the terminal gas using system 12, namely the purity (interval) of the nitrogen required by the laser cutting nozzle, and the pressure value (interval) of the nitrogen required by the terminal gas using system 12 can be obtained according to the purity (interval) of the required nitrogen, and at the moment, the flow meter 10 controls the nitrogen making unit 5. According to the gas consumption, the flow meter 10 senses the gas consumption flow and feeds back the gas consumption flow to the control system according to the monitored flow, the control system controls the opening size of the adjusting type electric valve I4 according to the feedback flow, and the opening angle of the adjusting type electric valve I4 ranges from 0% to 100% in percentage. According to the change of the actual gas consumption of a user in the using process, the size is monitored by the flow meter, and the opening angle of the adjusting type electric valve I4 is adjusted according to the feedback of data, so that the energy-saving effect is achieved. (if there are a plurality of nitrogen making units 5, the opening and closing of the single or a plurality of nitrogen making units can be determined according to the gas flow and the pressure.) if the purity is higher than the set purity, the opening and closing angle of the adjusting type electric valve II 9 is opened through the control system, so that the purity is stabilized at the required value.
The equipment is in the use, and nitrogen gas purity can not be stabilized when setting for the purity, and 11 transmission data of nitrogen gas analysis appearance give control system, and PLC (PLC 13 promptly) are according to setting for the purity, control regulation type motorised valve II 9 and open and close the angle, according to setting for the purity, make equipment be in setting for within the scope all the time to guarantee nitrogen gas purity's stability and reach energy-conserving effect.
Since, in the "original scheme", the air source passing through the heater is sent to the nitrogen generator, and the nitrogen generated by the nitrogen generator is directly sent to the end gas system 12 through the electric valve, the pressure value (interval) of the nitrogen generated at the beginning is small, and the cutting work of the end gas system 12 cannot be satisfied. The nitrogen gas can be used by the end gas system 12 until the required pressure value is reached, and the nitrogen gas needs to spend a certain time in the process until the required pressure value is reached, so that the user needs to wait.
In the invention, the check valve 6 is added to prevent gas from flowing back reversely when the nitrogen generating unit 5 is opened, and the backup pressure valve 7 is added to enable the nitrogen generated by the nitrogen generating unit 5 to open the backup pressure valve 7 when the nitrogen reaches a required pressure value, so that the nitrogen enters the terminal gas system 12, and thus the terminal gas system 12 can be directly connected to a nitrogen pressure value (interval) with required purity for cutting, the nitrogen generated by the nitrogen generating unit 5 is prevented from being directly sent to the terminal gas system 12, the waiting time of a user can be reduced, and the working efficiency is improved.
In the present invention, the nitrogen separation process used in the nitrogen production unit 5 is membrane separation nitrogen production or PSA separation nitrogen production, or other nitrogen production processes. The purity control is mainly increased, and the nitrogen generator can not only be applied to a film nitrogen generator for laser cutting, but also be applied to laser cutting with a PSA nitrogen generator.
The remaining parts of the invention, which are not described, may be the same as, or well known or may be implemented using the prior art, and will not be described in detail herein.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a nitrogen unit air supply system based on pressure, flow and purity control, its characterized in that includes nitrogen unit (5), nitrogen unit (5) are connected to terminal gas system (12), are equipped with check valve (6), are equipped with pressure valve (7), pressure sensor (8), flowmeter (10) and nitrogen gas analysis appearance (11) on the nitrogen gas return circuit that forms between this nitrogen unit (5) and terminal gas system (12).
2. The system for controlling the gas supply to the nitrogen generation unit based on pressure, flow and purity as claimed in claim 1, further comprising an air compressor (1), wherein the air compressor (1) is sequentially connected with a cooling dryer (2), a heater (3) and an adjusting electric valve I (4), the adjusting electric valve I (4) is connected with the nitrogen generation unit (5), and the nitrogen generation unit (5) is connected with the one-way valve (6).
3. The system for controlling the gas supply of the nitrogen generation unit based on pressure, flow and purity as claimed in claim 2, further comprising a control system, wherein the control system is respectively connected with the air compressor (1), the air dryer (2), the heater (3), the adjusting type electric valve I (4), the nitrogen generation unit (5), the pressure sensor (8), the flow meter (10) and the nitrogen analyzer (11).
4. The system for controlling the gas supply to the nitrogen generation unit based on pressure, flow and purity as claimed in claim 3, further comprising a regulating type electric valve II (9) controlled by the control system, wherein one end of the regulating type electric valve II (9) is connected with the output end of the cold dryer (2), and the other end is connected with the output end of the pressure backup valve (7).
5. The system for controlling the supply of gas to a nitrogen-generating unit based on pressure, flow and purity as claimed in claim 3 or 4, wherein the control system is based on a PLC control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220086404.7U CN217370920U (en) | 2022-01-13 | 2022-01-13 | Nitrogen making unit gas supply system based on pressure, flow and purity control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220086404.7U CN217370920U (en) | 2022-01-13 | 2022-01-13 | Nitrogen making unit gas supply system based on pressure, flow and purity control |
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| CN217370920U true CN217370920U (en) | 2022-09-06 |
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| CN202220086404.7U Active CN217370920U (en) | 2022-01-13 | 2022-01-13 | Nitrogen making unit gas supply system based on pressure, flow and purity control |
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| CN (1) | CN217370920U (en) |
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- 2022-01-13 CN CN202220086404.7U patent/CN217370920U/en active Active
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