CN110480160B - Diaphragm type nitrogen generator gas supply method and system based on pressure and flow control - Google Patents
Diaphragm type nitrogen generator gas supply method and system based on pressure and flow control Download PDFInfo
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- CN110480160B CN110480160B CN201910941676.3A CN201910941676A CN110480160B CN 110480160 B CN110480160 B CN 110480160B CN 201910941676 A CN201910941676 A CN 201910941676A CN 110480160 B CN110480160 B CN 110480160B
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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
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
- B23K26/123—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an atmosphere of particular gases
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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
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
-
- 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
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
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- 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
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Abstract
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 film type nitrogen generator based on pressure and flow, wherein the method comprises the following steps: step 1: an air source enters the membrane type nitrogen generator, and a control system controls the membrane type nitrogen generator to generate nitrogen; step 2: the nitrogen generated by the membrane nitrogen generator is connected to a terminal gas using system, and the control system controls the opening and closing of the delay proportional valve and the membrane nitrogen generator according to the pressure of a nitrogen loop between the nitrogen loop and the terminal gas using system. The system comprises a membrane type nitrogen generator, wherein the membrane type nitrogen generator is connected to a terminal gas utilization system, and a pressure sensor and a flowmeter are arranged on a nitrogen loop. The key of PLC control is the integral linkage of the flowmeter and the pressure sensor, so that the whole set of system can run in a matched manner 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.
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 film type nitrogen generator based on pressure and flow.
Background
There are two main methods of nitrogen supply for a conventional laser cutting machine: the first is a liquid nitrogen supply system; and the other is a PSA nitrogen making machine gas supply system.
The main process flow of liquid nitrogen gas supply is as follows: the method comprises the steps of a liquid nitrogen storage tank, gasification, a pressure regulating device, an air supply pipeline, a laser cutting nozzle and the like. The disadvantages are that: the liquid nitrogen has the defects of high price, dangerous logistics, storage and use (the liquid nitrogen belongs to dangerous chemicals), high management difficulty and the like.
The main process flow of PSA nitrogen making machine gas supply is as follows: the method comprises the steps of air source, PSA nitrogen making machine, nitrogen storage tank, pressure regulating device, air supply pipeline, laser cutting nozzle and the like. The disadvantages are that: PSA nitrogen generator gas supply system equipment is with high costs, and the energy consumption is big: the PSA nitrogen generator needs to work all the time during the process of stopping the laser cutting machine and changing workpieces, because the PSA nitrogen generator can not quickly make the nitrogen purity meet the working requirement after being restarted, the gas supply pressure is low, the pressure drop is large, and part of the PSA nitrogen generator needs to be added with supercharging equipment.
Disclosure of Invention
The invention aims to provide a method and a system for controlling the air supply of a membrane type nitrogen generator based on pressure and flow, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for controlling the gas supply of a membrane type nitrogen generator based on pressure and flow comprises the following steps:
step 1: an air source enters the membrane type nitrogen generator, and a control system controls the membrane type nitrogen generator to generate nitrogen;
step 2: the nitrogen generated by the membrane nitrogen generator is connected to a terminal gas using system, and the control system controls the opening and closing of the delay proportional valve and the membrane nitrogen generator according to the pressure of a nitrogen loop between the nitrogen loop and the terminal gas using system.
Preferably, an air source enters the membrane type nitrogen generator through a time delay proportional valve, a pressure sensor for detecting the pressure of nitrogen and a flow meter for detecting the flow of nitrogen are arranged on a nitrogen loop between the membrane type nitrogen generator and a terminal gas using system, and the pressure sensor and the flow meter are connected with a control system.
Preferably, an electric valve for controlling on-off and an automatic pressure relief valve for pressure reduction are further arranged on the nitrogen loop, the electric valve is connected with a control system, and the control system is based on a PLC control system.
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 method for obtaining the air source comprises the following steps:
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, connecting the air source passing through the cold dryer with a time-delay proportional valve through a heater.
Preferably, the air compressor, the cooling dryer and the heater are connected with a control system.
The invention also provides a pressure and flow control based film type nitrogen generator gas supply system, which comprises a film type nitrogen generator, wherein the film type nitrogen generator is connected to a terminal gas supply system, and a pressure sensor and a flow meter are arranged on a nitrogen loop formed between the film type nitrogen generator and the terminal gas supply system.
Preferably, the system also comprises an air compressor and a control system, wherein the air compressor is sequentially connected with a cold dryer, a heater and a delay proportional valve, the delay proportional valve is connected with the membrane nitrogen generator, and the control system is respectively connected with the air compressor, the cold dryer, the heater, the delay proportional valve, the membrane nitrogen generator, the heater, a pressure sensor and a flowmeter.
Preferably, the system further comprises an automatic pressure release valve and a nitrogen analyzer which are arranged on the nitrogen loop, wherein the automatic pressure release valve and the nitrogen analyzer are connected with a control system, and the control system is based on a PLC control system.
Compared with the prior art, the invention has the beneficial effects that:
in the system of the invention, when the membrane type nitrogen generator equipment is initially started and after the air compressor is started, starting a contact on a control panel of the film type nitrogen generator, starting the equipment to work, initially controlling by adjustable time, namely, the PLC control system controls the delay proportional valve and the electric valve to be in an open and conducting state at the same time, the air compressor absorbs air as an air source to provide an air source for the membrane type nitrogen generator, then the membrane type nitrogen generator gradually generates nitrogen until reaching a terminal gas utilization system, namely the purity (interval) of the nitrogen required by the laser cutting nozzle, the delay proportional valve and the electric valve are not controlled by the flow and pressure fed back to the PLC control system in the adjusting time, after the adjusting time, the pressure value (interval) of the nitrogen required by the terminal gas system can be obtained according to the purity (interval) of the required nitrogen, and 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 delay proportional valve according to the feedback flow, and the opening angle of the delay proportional valve is 0-100% 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 time-delay proportional valve is adjusted according to the feedback of data, so that the energy-saving effect is achieved.
The key of PLC control is the integral linkage of the flowmeter and the pressure sensor, so that the whole set of system can run in a matched manner 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.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
In the figure: 1 time delay proportional valve, 2 electric valves, 3 pressure sensors, 4 flow meters and 5 automatic pressure relief valves.
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.
Referring to fig. 1, the present invention provides a technical solution:
a method for controlling the gas supply of a membrane type nitrogen generator based on pressure and flow comprises the following steps:
step 1: an air source enters a film type nitrogen generator, and a control system controls the (film type) nitrogen generator to generate nitrogen;
step 2: the nitrogen generated by the membrane nitrogen generator is connected to a terminal gas using system, and the control system controls the opening and closing of the delay proportional valve 1 and the membrane nitrogen generator according to the pressure of a nitrogen loop between the nitrogen loop and the terminal gas using system.
In step 1 above: the method for obtaining the air source comprises the following steps:
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, connecting the air source passing through the cold dryer with a time-delay proportional valve through a heater.
The air compressor, the cold dryer and the heater are connected with a control system.
In the above step 2: an air source enters the membrane type nitrogen generator through the time delay proportional valve 1, a pressure sensor 3 for detecting the pressure of nitrogen and a flow meter 4 for detecting the flow of nitrogen are arranged on a nitrogen loop between the membrane type nitrogen generator and a terminal gas using system, and the pressure sensor 3 and the flow meter 4 are connected with a control system. An electric valve 2 for controlling on-off and an automatic pressure relief valve 5 for pressure reduction are further arranged on the nitrogen loop, the electric valve 2 is connected with a control system, and the control system is based on a PLC control system. And a nitrogen analyzer for monitoring the purity of nitrogen is also arranged on the nitrogen loop and is connected with the control system.
The invention also provides a pressure and flow control based film type nitrogen generator gas supply system, which comprises a (film type) nitrogen generator, wherein the film type nitrogen generator is connected to a terminal gas supply system, and a pressure sensor 3 and a flow meter 4 are arranged on a nitrogen loop formed between the film type nitrogen generator and the terminal gas supply system.
The air compressor is sequentially connected with a cold dryer, a heater and a delay proportional valve 1, the delay proportional valve 1 is connected with the membrane type nitrogen generator, and the control system is respectively connected with the air compressor, the cold dryer, the heater, the delay proportional valve 1, the membrane type nitrogen generator, an electric valve 2, a pressure sensor 3 and a flowmeter 4.
Still including establishing automatic relief valve 5, the nitrogen gas analysis appearance on the nitrogen gas return circuit, the nitrogen gas analysis appearance is connected with control system, and this control system is based on PLC control system.
In the system of the invention, when the membrane type nitrogen generator equipment is initially started and after the air compressor is started, starting a contact on a control panel of the film type nitrogen generator, starting the equipment to work, initially controlling by adjustable time, namely, the PLC control system controls the delay proportional valve 1 and the electric valve 2 to be in an open and conducting state at the same time, the air compressor absorbs air as an air source to provide an air source for the membrane type nitrogen generator, then the membrane type nitrogen generator gradually generates nitrogen until reaching a terminal gas utilization system, namely the purity (interval) of the nitrogen required by the laser cutting nozzle, the delay proportional valve 1 and the electric valve 2 are not controlled by the flow and pressure fed back to the PLC control system in the adjusting time, after the adjusting time, the pressure value (interval) of the nitrogen required by the terminal gas system can be obtained according to the purity (interval) of the required nitrogen, and the pressure value (interval) is controlled by the flow meter. According to the gas consumption, the flow meter 4 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 time delay proportional valve 1 according to the feedback flow, and the opening angle of the time delay proportional valve 1 is in the range of 0-100% 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 4, and the opening angle of the time delay proportional valve 1 is adjusted according to the feedback of data, so that the energy-saving effect is achieved.
When the system equipment is used, the pressure sensor 3 monitors the pressure of the nitrogen loop, and when the pressure is lower than the set alarm value of the pressure sensor 3, the control program is controlled by the pressure sensor 3, so that the pressure supply is met, the alarm is given immediately, and the user is reminded in time, so that the user can find the reason in time and get rid of the alarm point.
And in the use process of the system equipment, the heater is in a standby working state. When the nitrogen purity of the nitrogen loop is lower than a set alarm value, the nitrogen analyzer transmits data to the PLC control system, the PLC starts the heater according to the set temperature, the temperature of the heater is sensed by the temperature sensor, the constant temperature control system is adopted for the temperature, and the temperature is always within the set range according to the set temperature, so that the stability of the nitrogen purity is ensured, and the energy-saving effect is achieved.
When a terminal gas utilization system is connected, when the flow meter 4 monitors that the nitrogen flow is more than or equal to 1 (more than a critical value), the PLC controls to start the delay proportional valve 1 to be opened, so that a gas source enters a membrane group of the membrane type nitrogen generator, nitrogen and oxygen are separated through the membrane type nitrogen generator, and the electric valve 2 is controlled to be opened at the same time, so that pure nitrogen enters a use end (the terminal gas utilization system). When the flow of the nitrogen monitored by the flow meter 4 is 0 (below a critical value), the PLC controls the delay proportional valve 1 and the electric valve 2 to be closed, an air source entering the membrane type nitrogen generator is cut off (meanwhile, the PLC controls the membrane type nitrogen generator to stop working to achieve the purpose of energy saving), and then sufficient air is obtained by controlling the air compressor and the cold dryer to serve as the air source, so that the air pressure at the front section of the membrane group of the system is maintained to be not lower than a set value.
According to the invention, when the pressure sensor 3 monitors that the pressure data of the nitrogen loop is smaller than a set value, the PLC starts the delay proportional valve 1 to open, so that a gas source enters a membrane group of the membrane type nitrogen generator to realize nitrogen and oxygen separation, and meanwhile, the electric valve 2 of the membrane group is controlled to open, so that pure nitrogen enters a terminal gas system. And when the nitrogen loop data monitored by the pressure sensor 3 is greater than a set value, controlling the delay proportional valve 1 and the electric valve 2 to close, and cutting off the gas source entering the membrane group. The membrane group is closed through the switch of the valve, so that the membrane group is protected to be safe, and the air and nitrogen cannot be separated, thereby achieving the purpose of energy conservation.
According to the invention, the lowest pressure of the system is mMPa, and the highest pressure nMPa is adopted, wherein m is less than n, such as m =1.0MPa, and n =2.5 MPa. According to the technological requirements of the laser cutting machine, a pressure reducing device of the film type nitrogen generator, namely an automatic pressure relief valve 5 can be controlled to reach the required pressure.
In the normal pressure range of the system, the opening angle of the delay proportional valve 1 is controlled by the PLC according to the feedback flow preferentially, so that the energy-saving effect is achieved.
The key of PLC control is the integral linkage of the flowmeter and the pressure sensor, so that the whole set of system can run in a matched manner 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.
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 the gas supply of a membrane type nitrogen generator based on pressure and flow is characterized by comprising the following steps:
step 1: an air source enters the membrane type nitrogen generator, and a control system controls the membrane type nitrogen generator to generate nitrogen;
step 2: the control system controls the opening and closing of the delay proportional valve and the membrane type nitrogen generator according to the pressure of a nitrogen loop between the control system and the terminal gas utilization system and the flow control;
an air source enters the membrane type nitrogen generator through the time delay proportional valve, an electric valve for controlling the on-off is also arranged on the nitrogen loop, when a terminal gas utilization system is connected, when the flow meter monitors that the nitrogen flow is more than or equal to 1, the PLC controls to start the time delay proportional valve to open so that a gas source enters a membrane group of the membrane type nitrogen generator, the nitrogen and oxygen are separated through the membrane type nitrogen generator, meanwhile, the electric valve is controlled to be opened, so that the pure nitrogen enters a using end, namely a terminal gas using system, when the flow of the nitrogen monitored by the flow meter is 0, the PLC controls the time-delay proportional valve and the electric valve to be closed, cuts off the gas source entering the membrane type nitrogen generator, meanwhile, the PLC controls the membrane type nitrogen generator to stop working so as to achieve the purpose of energy conservation, and then sufficient air is obtained by controlling the air compressor and the cold dryer to be used as an air source so as to maintain the air pressure at the front section of the membrane group of the system to be not lower than a set value.
2. The method as claimed in claim 1, wherein a pressure sensor for detecting the pressure of nitrogen gas and a flow meter for detecting the flow rate of nitrogen gas are provided on a nitrogen loop between the membrane nitrogen generator and the end gas system, and the pressure sensor and the flow meter are connected with the control system.
3. The method for supplying gas to the membrane type nitrogen generator based on the pressure and flow control as claimed in claim 1 or 2, wherein an automatic pressure relief valve for pressure reduction is further arranged on the nitrogen loop, the electric valve is connected with a control system, and the control system is based on a PLC control system.
4. A method for feeding a pressure and flow control membrane based nitrogen generator as claimed in claim 3, wherein a nitrogen analyzer for monitoring nitrogen purity is further provided on said nitrogen circuit, and said nitrogen analyzer is connected to a control system.
5. The method for supplying air to a membrane nitrogen generator based on pressure and flow control as claimed in claim 1, wherein said method for obtaining said air supply comprises the steps of:
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, connecting the air source after passing through the cold dryer with a time-delay proportional valve.
6. The method as claimed in claim 5, wherein the air compressor, the cooling and drying machine, and the heater are connected to the control system.
7. The method as claimed in claim 1, wherein the method comprises connecting the membrane type nitrogen generator to an end gas system, and providing a pressure sensor and a flow meter on a nitrogen loop formed between the membrane type nitrogen generator and the end gas system.
8. The method for supplying air to the membrane type nitrogen generator based on the pressure and flow control as claimed in claim 7, further comprising an air compressor and a control system, wherein the air compressor is sequentially connected with a cold dryer, a heater and a time delay proportional valve, the time delay proportional valve is connected with the membrane type nitrogen generator, and the control system is respectively connected with the air compressor, the cold dryer, the heater, the time delay proportional valve, the membrane type nitrogen generator, the heater, the pressure sensor and the flow meter.
9. The method for supplying gas to the membrane type nitrogen generator based on the pressure and flow control as claimed in claim 7 or 8, further comprising an automatic pressure relief valve and a nitrogen analyzer which are arranged on the nitrogen loop, wherein the nitrogen analyzer is connected with a control system, and the control system is based on a PLC control system.
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| CN201910941676.3A CN110480160B (en) | 2019-09-30 | 2019-09-30 | Diaphragm type nitrogen generator gas supply method and system based on pressure and flow control |
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| CN103101889A (en) * | 2011-11-14 | 2013-05-15 | 母东艳 | Nitrogen production system based on membrane separation principle |
| CN202558631U (en) * | 2012-02-20 | 2012-11-28 | 林德工程（杭州）有限公司 | Optimization control structure for product load of nitrogen making machine |
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