CN114192977A - Method and system for controlling nitrogen production unit gas supply based on pressure, flow and purity - Google Patents

Method and system for controlling nitrogen production unit gas supply based on pressure, flow and purity Download PDF

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Publication number
CN114192977A
CN114192977A CN202210038100.8A CN202210038100A CN114192977A CN 114192977 A CN114192977 A CN 114192977A CN 202210038100 A CN202210038100 A CN 202210038100A CN 114192977 A CN114192977 A CN 114192977A
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nitrogen
gas
purity
pressure
electric valve
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CN202210038100.8A
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钱厚云
吕鸿惠
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Hangzhou Boman Fluid Industry Co ltd
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Hangzhou Boman Fluid Industry Co ltd
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Priority to CN202210038100.8A priority Critical patent/CN114192977A/en
Publication of CN114192977A publication Critical patent/CN114192977A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/38—Removing material by boring or cutting
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B21/00—Nitrogen; Compounds thereof
    • C01B21/04—Purification or separation of nitrogen
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B21/00—Nitrogen; Compounds thereof
    • C01B21/04—Purification or separation of nitrogen
    • C01B21/0405—Purification or separation processes
    • C01B21/0433—Physical processing only
    • C01B21/0438—Physical processing only by making use of membranes
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B21/00—Nitrogen; Compounds thereof
    • C01B21/04—Purification or separation of nitrogen
    • C01B21/0405—Purification or separation processes
    • C01B21/0433—Physical processing only
    • C01B21/045—Physical processing only by adsorption in solids
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
    • G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2210/00—Purification or separation of specific gases
    • C01B2210/0043—Impurity removed
    • C01B2210/0045—Oxygen

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Inorganic Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

The invention provides a method and a system for controlling gas supply of a nitrogen making unit based on pressure, flow and purity, comprising the following steps: 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

Method and system for controlling nitrogen production unit gas supply based on pressure, flow and purity
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 supplying gas to a membrane type nitrogen generator based on pressure and flow control (an authorization notice number CN110480160B, hereinafter referred to as an original scheme) in 2019, 9, 30, and the key point of PLC control is the integral linkage of a flowmeter and a pressure sensor, so that the whole system can run in a matched mode and achieve effective energy saving. 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: 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 in the using process so that the purity is stabilized at the required value and how the actual gas utilization amount is changed, and further improvement is urgently needed in the aspect of achieving the effect of energy saving. 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;
step 2: 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 purity of nitrogen 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 feed system based on pressure, purity and flow control, includes the nitrogen unit, the nitrogen unit is connected to the terminal and uses the gas system, 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.
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 an 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 flow meter is used for controlling. According to the gas consumption, the flow meter senses the gas consumption and feeds back the gas consumption 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 fed-back 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 nitrogen control unit gas supply method based on pressure, purity and flow control comprises the following steps:
step 1: an 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 the terminal gas utilization system 12, and the control system controls the opening, closing and angle of the adjusting type electric valve I4 according to the pressure of a nitrogen loop between the nitrogen generation unit and the terminal gas utilization system.
And step 3: and according to the nitrogen purity required by the terminal gas utilization system, the control system controls the opening, closing and angle 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 and feeds back the gas consumption 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 of system is in the use, and nitrogen gas purity can not be stably when setting for the purity, and nitrogen gas analysis appearance 11 transmission data gives control system, and PLC (PLC control system 13 promptly) is according to setting for the purity, and the angle is opened and close to control regulation type motorised valve II 9, according to setting for the purity, makes equipment be in setting for the within range 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 invention, the remaining parts not described, are the same as, or known or realizable by the prior art and will not be described in detail here.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that 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 (9)

1. A method for controlling gas supply of a nitrogen making unit based on pressure, flow and purity is characterized by comprising the following steps:
step 1: an 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 the terminal gas utilization system (12), and the control system controls the gas inlet flow and the gas outlet purity of the nitrogen generation unit (5) according to the pressure, the purity and the opening and closing and the angle of the flow control adjusting type electric valve I (4) and the adjusting type electric valve II (9) of the nitrogen loop between the nitrogen generation unit and the terminal gas utilization system.
2. The method for controlling the gas supply of the nitrogen making unit based on the pressure, the flow and the purity according to the claim 1, characterized in that the gas source enters the nitrogen making unit (5) through a regulating type electric valve I (4), a pressure sensor (8) for detecting the gas pressure of the nitrogen and a flow meter (10) for detecting the flow of the nitrogen 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 the control system.
3. A method for supplying gas to a nitrogen making unit based on pressure, purity and flow control according to claim 2, characterized in that a check valve (6) for preventing gas backflow is further provided on the nitrogen gas loop, one end of the check valve (6) is connected to the nitrogen making unit (5), the other end is connected to a back-up valve (7) for stabilizing the front-end gas outlet pressure, and the back-up valve (7) is connected to a pressure sensor (8) in the nitrogen gas loop.
4. A method for supplying gas to a nitrogen-making unit based on pressure, purity and flow control according to claim 3, characterized in that a nitrogen analyzer (11) for monitoring the nitrogen purity is further provided on the nitrogen circuit, and the nitrogen analyzer (11) is connected with a control system.
5. The method as claimed in any one of claims 1 to 5, wherein the gas source A enters the nitrogen loop through the adjustable electric valve II (9), and the control system controls the opening and closing and the angle of the adjustable electric valve II (9) according to the nitrogen purity of the end gas system (12).
6. The method of claim 1, wherein the method of obtaining the source of air comprises:
firstly, an air compressor (1) is adopted to take air as an air source;
secondly, dehydrating the obtained gas source through a cold dryer (2);
and finally, the air source passing through the cold dryer (2) is heated and connected with an adjusting electric valve I (4) and an adjusting electric valve II (9).
7. The nitrogen preparation unit gas supply system based on pressure, purity and flow control is characterized by comprising a nitrogen preparation unit (5), wherein the nitrogen preparation unit (5) is connected to a terminal gas system (12), and a check valve (6), a pressure preparation valve (7), a pressure sensor (8), a flowmeter (10) and a nitrogen analyzer (11) are arranged on a nitrogen loop formed between the nitrogen preparation unit (5) and the terminal gas system (12).
8. The nitrogen making unit gas supply system based on pressure, purity and flow control as claimed in claim 7, further comprising an air compressor (1) and a control system, wherein the air compressor (1) is sequentially connected with a cooling dryer (2), a heater (3) and an adjusting type electric valve I (4), the adjusting type electric valve I (4) is connected with the nitrogen making unit (5), the nitrogen making unit (5) is connected with the one-way valve (6), and the control system is respectively connected with the air compressor (1), the cooling dryer (2), the heater (3), the adjusting type electric valve I (4), the nitrogen making unit (5), a pressure sensor (8), a flow meter (10) and a nitrogen analyzer (11).
9. The nitrogen unit gas supply system based on pressure, purity and flow control as claimed in claim 8, 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).
CN202210038100.8A 2022-01-13 2022-01-13 Method and system for controlling nitrogen production unit gas supply based on pressure, flow and purity Pending CN114192977A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210038100.8A CN114192977A (en) 2022-01-13 2022-01-13 Method and system for controlling nitrogen production unit gas supply based on pressure, flow and purity

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210038100.8A CN114192977A (en) 2022-01-13 2022-01-13 Method and system for controlling nitrogen production unit gas supply based on pressure, flow and purity

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CN114192977A true CN114192977A (en) 2022-03-18

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