CN111408289A - Method and system for industrially continuously mixing gas with high precision - Google Patents
Method and system for industrially continuously mixing gas with high precision Download PDFInfo
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- CN111408289A CN111408289A CN202010239341.XA CN202010239341A CN111408289A CN 111408289 A CN111408289 A CN 111408289A CN 202010239341 A CN202010239341 A CN 202010239341A CN 111408289 A CN111408289 A CN 111408289A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/10—Mixing gases with gases
- B01F23/19—Mixing systems, i.e. flow charts or diagrams; Arrangements, e.g. comprising controlling means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/22—Control or regulation
- B01F35/221—Control or regulation of operational parameters, e.g. level of material in the mixer, temperature or pressure
- B01F35/2213—Pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
- B01F35/71805—Feed mechanisms characterised by the means for feeding the components to the mixer using valves, gates, orifices or openings
- B01F35/718051—Feed mechanisms characterised by the means for feeding the components to the mixer using valves, gates, orifices or openings being adjustable
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/80—Forming a predetermined ratio of the substances to be mixed
- B01F35/88—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise
- B01F35/883—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise using flow rate controls for feeding the substances
Abstract
The invention belongs to the technical field of mixed gas preparation, relates to an industrialized continuous high-precision mixed gas method, and particularly relates to a method and a system for realizing continuous high-precision large-scale production of mixed gas by using a novel control method. According to the method, two gases are subjected to concentration, flow and pressure precise calculation according to the flow of the mixed gas and the real-time change of the concentration of the mixed gas, and the flow of the inlet gas is controlled, so that the uniformity, timeliness, concentration accuracy, stability and the like of the mixed gas are guaranteed. After the pressure correction scheme is used, the pressure change is converted into gas volume change, namely volume flow, so that the pressure of the mixed gas buffer tank is adjusted and maintained to fluctuate in a small range through the flow, the pressure is stable, and the calculation method is finally implemented or is used for controlling the concentration and the flow. The whole control process realizes accurate directional quantitative control. Therefore, the response time becomes fast, the control precision is high, and the application range is wide.
Description
Technical Field
The invention belongs to the technical field of mixed gas preparation, relates to an industrialized continuous high-precision mixed gas method, and particularly relates to a method and a system for realizing continuous high-precision large-scale production of mixed gas by using a novel control method.
Background
Based on the reports of relevant patents and documents at home and abroad, the method for mixing the industrial gas is less, and the method for mixing the laboratory-level gas is more, is used for detecting the performance and the potential application value of the industrial gas, and is suitable for small-scale production and preparation.
At present, the industrial gas mixing needs are met by controlling the opening of an adjusting valve through the pressure of a buffer tank and controlling the flow ratio. The current control scheme is basically controlled by pressure regulation, when the pressure is reached, a regulating valve or PID (proportion integration differentiation) regulation is closed, and the pressure fluctuation occurs at the moment, so that the operation is stable in the steady continuous production. When large flow fluctuation occurs, the correction can be performed for a long time, and the correction cannot be performed under the condition of large flow or small flow; conventional control schemes are difficult to implement or even impossible when real-time changes in concentration are desired.
With the increasing precision requirement of fine chemical engineering, the mass production of continuous high-precision mixed gas is urgent.
Disclosure of Invention
The invention aims to overcome the defects of small-scale preparation and insufficient mixing precision of the conventional mixed gas, and provides an industrial continuous high-precision mixed gas method. According to the method, two gases are subjected to concentration, flow and pressure precise calculation according to the flow of the mixed gas and the real-time change of the concentration of the mixed gas, and the flow of the inlet gas is controlled, so that the uniformity, timeliness, concentration accuracy, stability and the like of the mixed gas are guaranteed.
The technical scheme of the invention is as follows:
an industrialized continuous high-precision gas mixing method comprises the following steps:
(1) two gases with different concentrations obtained by production respectively enter a gas buffer tank A and a gas buffer tank B;
(2) the gas in the gas buffer tank A and the gas in the gas buffer tank B are mixed by a static mixer and then enter a mixed gas buffer tank;
(3) a pipeline between the gas buffer tank A and the static mixer is sequentially connected with a controllable gas pressure regulating valve, a gas mass flow controller and a gas check valve; a controllable gas pressure regulating valve, a gas mass flow controller and a gas check valve are sequentially connected in a pipeline between the gas buffer tank and the static mixer;
(4) the gas in the mixed gas buffer tank enters gas using equipment through a mixed gas pressure regulating valve and a mixed gas mass flowmeter, and the indication P is obtained according to the pressure gauge of the mixed gas buffer tankMixing and compactingAnd a correction parameter η set by the system and an equipment volume parameter, and calculating a correction flow FRepair theThen obtaining the calculated flow FMixing ofBy calculating the flow rate FMixing ofAnd A gas concentration CAB gas concentration CBCalculating A gas flow FA(ii) a B gas flow FB(ii) a Thereby adjusting the gas mass flow controllers connected with the gas buffer tank A and the gas buffer tank B to ensure that the pressure P of the mixed gas buffer tankMixing and compactingAnd gas concentration CMixing ofMaintaining stability; the calculation formula is as follows:
Frepair the＝(PMixed label-PMixing and compacting)*VMixing of/PSign board/η*3600，
FMixing of’＝FMixing of+FRepair the，
FA＝FMixing of’*(CMixing of-CB)/(CA-CB)，
FB＝FMixing of’*(CA-CMixing of)/(CA-CB)；
Wherein
FRepair the-the flow rate is corrected,
Fmixing of-the real-time flow rate of the mixed gas mass flow meter,
Fmixing of' -calculating the flow rate of the fluid,
η -correction coefficient, value 0-1000s,
Pmixed label-the target pressure of the gas mixture,
Pmixing and compacting-the real-time pressure of the mixed gas,
Vmixing of-the volume of the buffer tank for the mixed gas,
Psign board-the pressure of the standard atmosphere,
Cmixing of-mixed gas buffer tank gas target concentration.
The limiting conditions are as follows: the requirements on the precision and the response time of the regulating valve and the flowmeter are higher. Such as mass flow controllers, may suffice.
The invention also provides an industrialized continuous high-precision gas mixing system, which comprises a gas buffer tank A and a gas buffer tank B; a gas buffer tank connects gradually A gas pressure regulating valve, A gas mass flow controller and A gas check valve through the pipeline, and this gas check valve A connects static mixer, and B gas buffer tank connects gradually B gas pressure regulating valve, B gas mass flow controller and B gas check valve through the pipeline, and this gas check valve B connects static mixer, static mixer connect the gas mixture buffer tank, on the pipeline of the gas appliances for connection of this gas mixture buffer tank, set gradually gas mixture pressure regulating valve, gas mixture mass flow meter.
Furthermore, a mixed gas buffer tank pressure transmitter is arranged on the mixed gas buffer tank.
Further, an A gas buffer tank pressure transmitter is arranged on the A gas buffer tank.
Furthermore, a B gas buffer tank pressure transmitter is arranged on the B gas buffer tank.
Further, the gas mass flow controller B can also be a flow meter and a regulating valve; the gas mass flow controller a may also be a flow meter and a regulating valve.
Due to the problems of instrument linear deviation, response delay and the like, the pressure P of the mixed gas buffer tank can be causedMixing and compactingIs offset, therefore, addMethod for correcting and calculating inlet pressure, i.e. method for converting gas pressure variation value into standard volume flow rate to implement quantitative control and regulation, such as PV-nRT (when low pressure), and calculating F required to be increased or decreased according to difference value with target pressureMixing ofAnd the flow volume and the correction fine adjustment amount are determined according to the correction parameters, so that the pressure is stabilized.
The method for industrially continuously mixing the gas with high precision has the following principle: two strands of gas are accurately calculated through concentration, flow and pressure, each flow of gas entering is controlled, and the uniformity, timeliness, concentration accuracy, stability and the like of mixed gas are guaranteed.
The invention has the beneficial effects that:
the control scheme of the industrial continuous high-precision gas mixing method is that the gas is mixed and prepared according to the amount of gas needed at the downstream by flow regulation, the opening regulation of a conventional pressure control regulating valve is converted into the control flow of a gas mass flow controller, a quantitative control mode is generated, and the method can be instantly adjusted and adapted within a large flow fluctuation range without long correction time in the conventional PID regulation. The pressure fluctuation is only related to the volume of the buffer tank, so that after the pressure correction scheme is used, the pressure change is converted into gas volume change, namely volume flow, and the pressure of the mixed gas buffer tank is adjusted and maintained to fluctuate in a small range through the flow, so that the pressure stability is realized, and the calculation method is finally implemented to control the concentration and the flow. The whole control process realizes accurate directional quantitative control. Therefore, the response time becomes fast, the control precision is high, and the application range is wide.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a system according to embodiment 3 of the present invention.
Wherein, 1 is an A gas buffer tank; 2 is a gas buffer tank pressure transmitter A; 3 is a gas pressure regulating valve B; 4 is a gas buffer tank B; 5 is a gas buffer tank pressure transmitter B; 6 is a gas mass flow controller B; 7 is a gas check valve B; 8 is A gas pressure regulating valve; 9 is A gas mass flow controller; 10 is an A gas check valve; 11 is a static mixer; 12 is a mixed gas buffer tank; 13 is a mixed gas buffer tank pressure transmitter; 14 is a mixed gas pressure regulating valve; and 15, a mixed gas mass flowmeter.
Detailed Description
For better understanding of the present invention, the technical solution of the present invention will be described in detail with specific examples, but the present invention is not limited thereto.
Example 1
An industrialized continuous high-precision gas mixing method comprises mixing fluorine gas and argon gas, namely storing the fluorine gas with a gas volume fraction of 90.0% and pure argon gas in a gas A buffer tank and a gas B buffer tank respectively; and (3) sequentially passing 90.0% of fluorine gas in the gas buffer tank A through a gas pressure regulating valve, a gas mass flow controller and a gas check valve, entering a static mixer, sequentially passing pure argon gas in the gas buffer tank B through the gas pressure regulating valve, the gas mass flow controller and the gas check valve, entering the static mixer, and mixing the mixed 90.0% of fluorine gas and the mixed pure argon gas from the static mixer into a mixed gas buffer tank.
Fluorine gas concentration C in gas buffer tank AA90.0% and the fluorine gas concentration in the buffer tank B was CB0.0%, an initial actual pressure of the mixed gas buffer tank of 200kPa, and a volume V of the mixed gas buffer tankMixing ofIs 2.0m3Target concentration C of fluorine gas in mixed gasMixing of10.0%, target pressure P of mixed gas buffer tankMixed labelAt 220kPa and the pressure correction coefficient η is 120s, when the mixed gas buffer tank outlet flow is from FMixing of＝1.00Nm3At 1 Nm/s/h3Increase in the speed increase to 90.00 Nm/h3H and maintained at 90.00Nm3The actual negative deviation of the outlet flow of the mixed gas buffer tank is 2 percent, and the sum of the pressure and the flow of the mixed gas is obtained by a calculation formulaAnd (4) flow rate.
The flow rates of the gases (A, B, and C) were automatically adjusted A, B by the gas mass flow controllers A and B, and the flow rates of the buffer tanks A and B, and the pressure of the buffer tank of the mixer were varied as shown in Table 1.
A. And the gas in the gas buffer tank B enters the mixed gas buffer tank through the static mixer to be mixed. And the indication value of the pressure gauge of the mixed gas buffer tank is maintained near the target pressure through the difference value between the air inflow and the air outflow. Taking P at standard atmospheric pressureSign boardIs 100.0 kPa.
The reading of the mixed gas mass flowmeter 15 is between 0 and 100.0Nm3And h is operated.
A gas flow FA(ii) a B gas flow FBThe flow calculation formula is as follows:
Frepair the＝(PMixed label-PMixing and compacting)*VMixing of/PSign board/η*3600，
FMixing of’＝FMixing of+FRepair the，
FA＝FMixing of’*(CMixing of-CB)/(CA-CB)，
FB＝FMixing of’*(CA-CMixing of)/(CA-CB)。
Wherein
FRepair the-the flow rate is corrected,
Fmixing ofThe real-time flow rate of the mixed gas mass flow meter 15,
Fmixing of' -calculating the flow rate of the fluid,
η -correction coefficient, value 0-1000s,
Pmixed label-the target pressure of the gas mixture,
Pmixing and compacting-the real-time pressure of the mixed gas,
Vmixing of-the volume of the buffer tank for the mixed gas,
Psign board-the pressure of the standard atmosphere,
Cmixing of-gas target of the mixed gas buffer tankAnd (4) concentration.
TABLE 1 tables of data for the respective parameters
Note: when 0s is detected, the initial state at that time is simply indicated, and the control is not involved.
As can be seen from Table 1, the reading of the mixed gas mass flowmeter does not affect the corrected flow value in the fluctuation process, and the corrected flow only has a quantitative relation with the differential pressure; the fluctuation of the flow meter reading can directly influence the change of the tank A flow and the tank B flow; the flow meter reaches 90.00Nm3After/h, the actual pressure and the target pressure are less than 1kPa in 5 minutes (time is determined by η correction factor), and the change is stable and the fluctuation is small in the whole adjusting process.
Example 2
An industrial continuous high-precision gas mixing method is characterized in that hydrogen chloride gases with different concentrations are mixed, namely, the hydrogen chloride gas with the gas volume fraction of 40.0% and the hydrogen chloride gas with the gas volume fraction of 5.0% are respectively stored in a gas buffer tank A and a gas buffer tank B, and the hydrogen chloride gases with the two different concentrations enter a mixed gas buffer tank through a static mixer and are mixed through a gas pressure regulating valve connected with the gas buffer tank A and the gas buffer tank B.
Concentration C of hydrogen chloride gas in A gas buffer tankA40.0% of hydrogen chloride gas concentration C in the gas buffer tank BB5.0%, the actual pressure of the mixed gas buffer tank is 330kPa, and the volume V of the mixed gas buffer tankMixing of0.1m3, target pressure P of mixed gas buffer tankMixed label300kPa, the outlet flow of the mixed gas buffer tank is stabilized at FMixing ofUnder the conditions that the outlet gas flow of the mixed gas buffer tank is actually negative deviation of 2% and the pressure correction coefficient η is 30s at 40.0Nm3/h, when the concentration of the hydrogen chloride gas in the mixed gas buffer tank is increased from 5.0% to 40.0% at the rate of 1.0% per second and stabilized for 25s, the concentration is reduced to 20.0% at the rate of 1.0% per second, and then the concentration is maintained at 20.0%, the pressure and the flow are obtained by calculation formulas and are shown in the table 2, and the A, the B and the A are automatically adjusted through the A gas mass flow controller and the B gas mass flow controller,And B, gas flow rate. And the gas in the gas buffer tank A and the gas in the gas buffer tank B enter the mixed gas buffer tank through the static mixer to be mixed. And the indication value of the pressure gauge of the mixed gas buffer tank is maintained near the target pressure through the difference value between the air inflow and the air outflow. The standard atmospheric pressure was 100.0 kPa.
A gas flow FA(ii) a B gas flow FBTheir calculation formula is as follows:
Frepair the＝(PMixed label-PMixing and compacting)*VMixing of/PSign board/η*3600，
FMixing of’＝FMixing of+FRepair the，
FA＝FMixing of’*(CMixing of-CB)/(CA-CB)，
FB＝FMixing of’*(CA-CMixing of)/(CA-CB)。
Wherein
FRepair the-the flow rate is corrected,
Fmixing ofThe real-time flow rate of the mixed gas mass flow meter 15,
Fmixing of' -calculating the flow rate of the fluid,
η -correction coefficient, value 0-1000s,
Pmixed label-the target pressure of the gas mixture,
Pmixing and compacting-the real-time pressure of the mixed gas,
Vmixing of-the volume of the buffer tank for the mixed gas,
Psign board-the pressure of the standard atmosphere,
Cmixing of-mixed gas buffer tank gas target concentration.
TABLE 2 tables of respective parameters
Note: when 0s is detected, the initial state at that time is simply indicated, and the control is not involved.
As can be seen from Table 2, the flow meter reading does not affect the corrected flow value in the fluctuation process, the corrected flow only has a quantitative relation with the differential pressure, the fluctuation of the flow meter reading can directly affect the change of the tank A flow and the tank B flow, the actual pressure and the target pressure in the whole process are less than 1kPa (time is determined by η correction coefficients) within 2 minutes and enter a balance state after 2 minutes, and the change is stable and the fluctuation is small in the whole regulation process.
Example 3
An industrialized continuous high-precision gas mixing system comprises a gas buffer tank A1 and a gas buffer tank B4; the A gas buffer tank 1 is sequentially connected with an A gas pressure regulating valve 8, an A gas mass flow controller 9 and an A gas check valve 10 through pipelines, the A gas check valve 10 is connected with a static mixer 11, the B gas buffer tank 4 is sequentially connected with a B gas pressure regulating valve 3, a B gas mass flow controller 6 and a B gas check valve 7 through pipelines, the B gas check valve 7 is connected with the static mixer 11, the static mixer 11 is connected with a mixed gas buffer tank 12, and a mixed gas pressure regulating valve 14 and a mixed gas mass flow meter 15 are sequentially arranged on the pipeline of the gas equipment for connecting the mixed gas buffer tank 12.
A mixed gas buffer tank pressure transmitter 13 is provided on the mixed gas buffer tank.
And the gas buffer tank A is provided with a gas buffer tank A pressure transmitter 2.
And a B gas buffer tank pressure transmitter 5 is arranged on the B gas buffer tank.
Claims (6)
1. An industrial continuous high-precision gas mixing method is characterized by comprising the following steps:
(1) two gases with different concentrations obtained by production respectively enter a gas buffer tank A and a gas buffer tank B;
(2) the gas in the gas buffer tank A and the gas in the gas buffer tank B are mixed by a static mixer and then enter a mixed gas buffer tank;
(3) a pipeline between the gas buffer tank A and the static mixer is sequentially connected with a controllable gas pressure regulating valve, a gas mass flow controller and a gas check valve; a controllable gas pressure regulating valve, a gas mass flow controller and a gas check valve are sequentially connected in a pipeline between the gas buffer tank and the static mixer;
(4) the gas in the mixed gas buffer tank enters gas using equipment through a mixed gas pressure regulating valve and a mixed gas mass flowmeter, and the indication P is obtained according to the pressure gauge of the mixed gas buffer tankMixing and compactingAnd a correction parameter η set by the system and an equipment volume parameter, and calculating a correction flow FRepair theThen obtaining the calculated flow FMixing ofBy calculating the flow rate FMixing ofAnd A gas concentration CAB gas concentration CBCalculating A gas flow FA(ii) a B gas flow FB(ii) a Thereby adjusting the gas mass flow controllers connected with the gas buffer tank A and the gas buffer tank B to ensure that the pressure P of the mixed gas buffer tankMixing and compactingAnd gas concentration CMixing ofMaintaining stability; the calculation formula is as follows:
Frepair the＝(PMixed label-PMixing and compacting)*VMixing of/PSign board/η*3600，
FMixing of’＝FMixing of+FRepair the，
FA＝FMixing of’*(CMixing of-CB)/(CA-CB)，
FB＝FMixing of’*(CA-CMixing of)/(CA-CB)；
Wherein
FRepair the-correcting the flow rate,
Fmixing of-real-time flow rate of the mixture gas mass flow meter,
Fmixing of' -calculating the flow rate of the fluid,
η -correction coefficient, value 0-1000s,
Pmixed label-the target pressure of the gas mixture,
Pmixing and compacting-the real-time pressure of the mixed gas,
Vmixing of-the volume of the buffer tank for the mixed gas,
Psign board-the pressure of the standard atmosphere,
Cmixing of-mixed gas buffer tank gas meshThe target concentration.
2. An industrial continuous high-precision gas mixing system is characterized by comprising a gas buffer tank A and a gas buffer tank B; a gas buffer tank connects gradually A gas pressure regulating valve, A gas mass flow controller and A gas check valve through the pipeline, and this gas check valve A connects static mixer, and B gas buffer tank connects gradually B gas pressure regulating valve, B gas mass flow controller and B gas check valve through the pipeline, and this gas check valve B connects static mixer, static mixer connect the gas mixture buffer tank, on the pipeline of the gas appliances for connection of this gas mixture buffer tank, set gradually gas mixture pressure regulating valve, gas mixture mass flow meter.
3. The system for industrial continuous high-precision gas mixing according to claim 1, characterized in that a mixed gas buffer tank pressure transmitter is provided on the mixed gas buffer tank.
4. The system for industrial continuous high-precision gas mixing according to claim 1, characterized in that an A gas buffer tank pressure transmitter is arranged on the A gas buffer tank.
5. The system for industrial continuous high-precision gas mixing according to claim 1, characterized in that a B gas buffer tank pressure transmitter is provided on the B gas buffer tank.
6. The industrial continuous high-precision gas mixing system according to claim 1, wherein the B gas mass flow controller can also be a flow meter and a regulating valve; the gas mass flow controller a may also be a flow meter and a regulating valve.
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| CN113110629A (en) * | 2021-04-13 | 2021-07-13 | 中国农业大学 | Aquatic product microenvironment gas regulation and control method, system and device |
| CN113110629B (en) * | 2021-04-13 | 2022-05-17 | 中国农业大学 | Aquatic product microenvironment gas regulation and control method, system and device |
| CN114653234A (en) * | 2022-04-06 | 2022-06-24 | 中煤科工集团重庆研究院有限公司 | Intelligent mixing system and method for stabilizing air source |
| CN115830792A (en) * | 2022-11-29 | 2023-03-21 | 三峡科技有限责任公司 | Safety monitoring system for large-scale water electrolysis hydrogen production |
| CN115830792B (en) * | 2022-11-29 | 2024-02-13 | 三峡科技有限责任公司 | Large-scale electrolytic water hydrogen production safety monitoring system |
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