CN206532162U - A kind of Ocean acidification and hypoxia-mimicking device - Google Patents
A kind of Ocean acidification and hypoxia-mimicking device Download PDFInfo
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Abstract
The utility model is related to a kind of Ocean acidification and hypoxia-mimicking device, including source of the gas, is air-dried filtering pressure reducer, back-up safety magnetic valve, CO2Filter, device for drying and filtering, mass flow controller, acquisition controller, water quality sensor, exhaust valve group.Seawater pH and oxygen dissolving value are monitored by pH and dissolved oxygen sensor in real time, by the way of double incremental timestamps, regulation and control air, N2、CO2Aeration ratio, to adjust seawater pH and dissolved oxygen level to setting value and keep stable state.The utility model can in real time monitor and adjust source of the gas proportioning, and the pH and dissolved oxygen content of Synchronization Control seawater have the advantages that stable state accuracy is high, dynamic response is good, adjustment time is short, and can still keep under conditions of having marine organisms respiration interference higher precision.
Description
Technical field
The utility model is related to marine environment simulation field, specifically a kind of Ocean acidification and hypoxia-mimicking device.
Background technology
The aggravation of the mankind's activity such as Global climate change and offshore eutrophication, causes the phenomenons such as Ocean acidification and hypoxemia past
Toward generation simultaneously.Such phenomenon is had been reported that repeatly in China coastal seas environment, and marine organisms and marine eco-environment safety belt are come
Grave danger.At present, most researchs are by the way of individually acidifying or hypoxemia using carrying out related stress experiment, on being acidified and low
Development is needed in the research of oxygen collaboration influence badly.Therefore, it can be that development can that research and development, which can accurately simulate Ocean acidification and the device of hypoxemia,
Simulated experiment is controlled, the influence of Ocean acidification and hypoxemia to the ecosystem is inquired into and has great importance.
The analogy method of domestic and international existing Ocean acidification and hypoxemia, mainly has：
1) experience control methods：CO is carried out to Marine water2、N2Independent aeration or joint aeration, treat that seawater pH and dissolved oxygen are steady
After fixed, it is put into marine organisms and is tested；The rule of thumb pre-set CO of such a device2、N2Aeration quantity, ocean life
Under thing respiration interference, dissolved oxygen and pH are extremely unstable；Such a method is limited using scope, and experimental result is difficult to repeat.
2) solenoid valve control method：By detecting pH and dissolved oxygen in seawater, solenoid valve control CO is used2And N2Be passed through, with up to
To the pH and dissolved oxygen of setting.Such a method is only capable of whether being passed through for simple control gas, and can not adjust the proportioning of gas, therefore
Aeration is unstable, and aeration quantity and aeration period change are obvious, it is impossible to accurately controlled.In addition, being passed through for gas cuts in and out,
Influence is produced on marine organisms behavior, and then influences the accuracy of result of study.
Utility model content
In view of the shortcomings of the prior art, the utility model provides a kind of Ocean acidification and hypoxia-mimicking device, by real-time
Seawater dissolved oxygen is monitored, water body dissolved oxygen and the regulation of pH precise synchronizations is carried out.
The technical scheme that the utility model is used to achieve the above object is：
A kind of Ocean acidification and hypoxia-mimicking device,
Air source of the gas is by being linked into the input of air mass flow amount controller 6, MAF after air flue
The output end of controller 6 is connected to exhaust solenoid valve 12, and the air after flow control is mixed with nitrogen, carbon dioxide；
Nitrogen after decompression is passed into the input of nitrogen mass flow controllers 7, nitrogen mass flow controllers 7
Output end be connected to exhaust solenoid valve 12, the nitrogen after flow control is mixed with air, carbon dioxide；
Carbon dioxide after decompression is passed into the input of carbon dioxide mass flow controller 8, titanium dioxide
The output end of carbon mass flow controller 8 is connected to exhaust solenoid valve 12, by the carbon dioxide after flow control and air,
Nitrogen is mixed；
The connection aeration valve group 13 of exhaust solenoid valve 12, controls mixed gas to be passed through aeration valve group 13, is aerated valve group 13
Connected with aeration ring 14, pass the gas through aeration ring 14 and water body is aerated；
The connection dissolved oxygen of acquisition controller 9 measurement sensor 10 and pH measurement sensors 11, collection dissolved oxygen information and pH value
Information；The connection air mass flow of acquisition controller 9 amount controller 6, nitrogen mass flow controllers 7, carbon dioxide mass flow
Controller 8, air flue and exhaust solenoid valve 12, control signal is sent to it, and gathers air mass flow amount controller simultaneously
6th, the feedback signal of nitrogen mass flow controllers 7 and carbon dioxide mass flow controller 8, detection means working condition.
The air flue includes being air-dried the input that filtering pressure reducer 1 is connected to device for drying and filtering 5 by magnetic valve 3
End, air source of the gas is dried and particle filtering by being air-dried filtering pressure reducer 1, and by gas after being adjusted to pressure
By entering device for drying and filtering 5 after magnetic valve 3.
It is additionally included between magnetic valve 3 and device for drying and filtering 5 and carbon dioxide screen pipe 4 is set, the control output of magnetic valve 3
Air is filtered out by carbon dioxide screen pipe 4 and is passed through device for drying and filtering 5 after carbon dioxide again.
The filtering pressure reducer 1 that is air-dried is by the connection aeration ring 14 of back-up safety magnetic valve 2, and acquisition controller 9 connects
Back-up safety magnetic valve 2 is connect, when not being controlled or being broken down by sets target after system electrification, control back-up safety electricity
Magnet valve 2 is opened, and air is exposed to water body.
The aeration valve group 13 includes one group of dissolved oxygen sensor and pH measurement sensors are inserted in 1 water body, the water body
By several water bodys of the series connection of peristaltic pump 15, aeration ring 14 all the way is inserted in each water body.
Several described water bodys are 1~6 water body.
The utility model has the advantages that and advantage：
1. Ocean acidification and hypoxia-mimicking device of the present utility model based on PID, are calculated using double incremental timestamps
Method, can determine suitable aeration ratio in real time according to the measured value of pH and dissolved oxygen and the difference of user's setting value；Compare and adopt
With the regulative mode of electromagnetic valve switch, not only governing speed is fast for pid algorithm, and the holding effect of pH and dissolved oxygen stable state, remote victory
In magnetic valve control methods；
2. Ocean acidification and hypoxia-mimicking device and its control algolithm of the present utility model based on PID, total gas flow rate
It is adjustable, it is easy to carry out the seawater of different temperatures and volume the synchronous adjustment of pH and dissolved oxygen, and pH and dissolved oxygen can arbitrarily be set,
Overcome adjustment pH and the interactional shortcoming of dissolved oxygen；
3. Ocean acidification and hypoxia-mimicking device and its control algolithm of the present utility model based on PID, are there is ocean life
In the water body of thing respiration interference, remain to realize the stability contorting of pH and dissolved oxygen, thus the sea under Ocean acidification and Hypoxia Stress
The research works such as foreign biological physiology and behavior response have good application prospect.
Brief description of the drawings
Fig. 1 is hardware structure diagram of the present utility model；
Fig. 2 is method schematic of the present utility model；
Fig. 3 is control flow of the present utility model；
Fig. 4 is aeration water body series connection schematic diagram of the present utility model；
Wherein, 1 is is air-dried filtering pressure reducer, and 2 be back-up safety magnetic valve, and 3 be three-way magnetic valve, and 4 be titanium dioxide
Carbon screen pipe, 5 be device for drying and filtering, and 6 be air mass flow amount controller, and 7 be N2Mass flow controller, 8 be CO2Quality stream
Amount controller, 9 be acquisition controller, and 10 be dissolved oxygen measurement sensor, and 11 be pH measurement sensors, and 12 be exhaust solenoid valve, 13
It is aeration ring for aeration valve group, 14,15 be peristaltic pump.
Embodiment
Below in conjunction with the accompanying drawings and embodiment is described in further detail to the utility model.
Three channel gas source is respectively in Ocean acidification and the hypoxia-mimicking device：Air, N2、CO2.Compressed air is by empty
Gas dry filter pressure reducer 1 is dried and particle filtering, and pressure is adjusted into 0.2-0.5Mpa；Gas passes through threeway afterwards
Magnetic valve 3, if desired improves pH, then by CO2Screen pipe 4 removes CO in air2Device for drying and filtering 5 is entered back into, conversely, directly
Into device for drying and filtering 5；Dry gas air inlet mass flow controller 6；Air mass flow amount controller 6 can be according to adopting
The analog or digital signal that collection controller 9 is inputted accurately adjusts the flow of air, into exhaust solenoid valve 12 and with nitrogen, CO2
Gas mixing, through being aerated valve group 13, aeration ring 14 is aerated to water body.Air mass flow amount controller should be greater than 10L/min；
N2Mass flow controller should be greater than 10L/min；CO2Mass flow controller should be greater than 0.1L/min.
Air gas circuit, which is sequentially passed through, is air-dried filtering pressure reducer, CO2Filter, device for drying and filtering, MAF
Controller, exhaust valve group enter experiment water body；N2Gas circuit is successively through N2Mass flow controller, exhaust valve group enter experiment water body；
CO2Gas circuit sequentially passes through CO2Mass flow controller, exhaust valve group enter experiment water body.
CO2Filtering and drying device, should include 3 three-way electromagnetic valves, CO2Filter；Three-way magnetic valve is used in CO2Filtering and
Do not filter and switch between two gas circuits.
Nitrogen is accessed using calibrating gas via pressure reducer, and access gas pressure is 0.2-0.5Mpa, and nitrogen enters nitrogen
Mass flow controller 7, and N is accurately adjusted according to the analog or digital signal of input2Flow, into exhaust solenoid valve 12 with
Air, CO2Gas mixing, through being aerated valve group 13, aeration ring 14 is aerated to water body.
CO2Accessed using calibrating gas via pressure reducer, access gas pressure is 0.2-0.5Mpa, nitrogen enters CO2Quality
Flow controller 8, and accurately adjust according to the analog or digital signal of input the flow of nitrogen, into exhaust solenoid valve 12 with it is empty
Gas, nitrogen mixing, through being aerated valve group 13, aeration ring 14 is aerated to water body.
Described device includes standby gas circuit all the way, by being air-dried the gas of filtering pressure reducer 1 out except that can enter three
Three-way electromagnetic valve 3, can also pass through back-up safety magnetic valve 2；When system electrification or failure, back-up safety magnetic valve 2 is opened,
Air is exposed to water body.
The acquisition controller 9 of described device has collection, calculating, control, driving function, is the nucleus equipment of device.Adopt
The pH that the dissolved oxygen and pH measurement sensors that the collection collection dissolved oxygen of controller 9 measurement sensor 10 is measured are determined, by PID and in advance
Survey after control algolithm, control three-way magnetic valve 3 and mass flow controller 6,7,8 and exhaust solenoid valve 12；While acquisition quality
The feedback signal of flow control meter 6,7,8, the working condition of timely judgment means.Acquisition controller has compatible various pH and dissolving
The interface of lambda sensor.For the dissolved oxygen content and pH in quick accurate control seawater, system employs double PID and PREDICTIVE CONTROL
Algorithm, accurately controls the flow and proportioning of gas.
The control principle of acquisition controller 9 such as Fig. 2 of described device；User is set after pH and dissolved oxygen aim curve, and system is read
Current target value is taken, control is proceeded by；Dissolved oxygen sensor and pH sensors measure dissolved oxygen and pH, system in current water body in real time
It is compared after reading with desired value, calculates error, and obtain the error change amount in controlling cycle.Passing through PID master controls
Loop and PID control subsidiary loop, obtain the accurate proportioning of gas；The proportioning of gas is converted into the corresponding numeral of gas flow
Control signal or analog signal, drive mass flow controller, gas flow are changed in real time.
After control flow such as Fig. 3 of acquisition controller 9 of described device, system electrification, control is performed according to user operation instruction
Flow processed, detects whether measurement period, if to measurement period, gathering measurement value sensor and showing record；Detect afterwards
Whether controlling cycle is arrived, if to controlling cycle, perform prediction and pid algorithm, calculating obtains each component gas flow；Control electricity
Magnet valve, and each component gas flow is converted into numeral or analog control signal output；Now system detectio mass flowmenter is defeated
Go out, if flowmeter is exported and is not inconsistent with control output, system stops automatically controlling, and opens back-up safety valve, and send report
Alert information.
The aeration valve group 13 of described device, can be achieved acidifying and the coordinated signals of hypoxemia of the water body of 1-6 containers.Such as Fig. 4
It is shown, one group of dissolved oxygen and pH measurement sensors are only needed, can connect 1-6 water body of control, each water body can connect aeration valve group 13
Aeration head all the way；Each water body is connected mutually by peristaltic pump 15, to ensure that water circulation flows.Pass through peristaltic pump and air bleeding valve
Group, you can realize the pH and dissolved oxygen using the multiple temporarily foster water bodys of one group of pH and dissolved oxygen sensor Synchronization Control.
A kind of Ocean acidification and hypoxia-mimicking device and control algolithm, comprise the following steps：
The first step：System reads current dissolved oxygen desired value, collection dissolved oxygen sensor value, calculates error, and according to control
Error change amount in cycle, through master control pid algorithm, obtains air theoretical proportions.
Main pid algorithm uses incremental timestamp algorithm, its mathematic(al) representation：
[Δ AIR%] is the variable quantity of air mass flow ratio in current control period in formula；KP, KI, KD are respectively air
Flow proportional operator, air mass flow integral operator, air mass flow differential operator, doerrnFor current n moment dissolved oxygen error,
doerrn-1For n-1 moment dissolved oxygens error, doerrn-2For n-2 moment dissolved oxygen errors.KP, KI, KD operator is adjusted, according to system
Response time, volume size, pid parameter reasoning is tested, a two-dimensional array is obtained, PID [2] [3]=2,100,
100 }, { 0.5,1,100 }, { 0.5,10,10 } }, the value of array is respectively KP, KI, KD value；Current n moment dissolved oxygen errors are big
When 2mg/L, KP, KI, KD value are respectively { 2,100,100 }, to shorten the time of control；Current n moment dissolved oxygen errors are more than
0.8mg/L, during less than 2mg/L, KP, KI, KD value are respectively { 0.5,1,100 }；Current n moment dissolved oxygens error is less than 0.8mg/L,
KP, KI, KD value are respectively { 0.5,10,10 }.
Calculate the ratio that air accounts for total gas couette：
[AIR%]n=[AIR%]n-1+ [Δ AIR%], wherein [AIR%]nFor current n moment air mass flow ratio, in formula
[AIR%]n-1For n-1 moment air mass flow ratios.
Calculate air gas flow：
[AIR]n=[all] × [AIR%]n, wherein [AIR]nFor the flow of current n moment air, [all] is total gas
Flow, total gas couette is set by operating personnel, and scope is 10L/min-50L/min.
Second step：System reads current pH desired values, collection pH sensor values, calculates error, and according to controlling cycle
Interior error change amount, through aiding in pid control algorithm, obtains CO2The theoretical delivery of gas.Aid in pid algorithm equally using increasing
Amount formula pid control algorithm, its mathematic(al) representation：
[Δ CO in formula2] it is current CO2Gas flow variable quantity, KPf、KIf、KDfRespectively CO2Gas flow ratio is calculated
Son, integral operator, differential operator；pherrnFor current n moment pH error, pherrn-1For n-1 moment pH error, pherrn-2For
N-2 moment pH errors；According to the response time of system, volume size, pid parameter reasoning is tested, KPf、KIf、KDfValue difference
It is { 0.5,5,5 }.
CO needed for calculating2The theoretical delivery of gas：
[CO2]n=[CO2]n-1+[ΔCO2]
Wherein [CO2]n-1For n-1 moment CO2The flow of gas.
Calculate CO2Gas mass flow controller answers output flow：
[MFC_CO2]n=[CO2]n-[AIR]n× 0.03%
Wherein [MFC_CO2]nFor CO2Gas mass flow controller answers output flow, if this value is less than 0, needs to open
CO2Strainer valve, the CO crossed in air filtering2.0.03% is CO2Aerial ratio, brings for supplementing the variation of air inlet amount
CO2Flow changes.
Calculate N2Gas mass flow measuring device answers output flow：
[N2]n=[all] × (1- [AIR%]n)-[CO2]n+[AIR]n× 0.03%
3rd step：Gas flow is changed into numeral or analog voltage signal, control mass flow controller accurately exports gas
Body flow.In a controlling cycle, the gas flow of accurate control mass flow controller；Acquisition quality flow control simultaneously
Device feedback signal, obtains real gas flow in real time, when actual flow is with answering output flow to differ larger, adjustment in real time or hair
Go out warning message.
So far, acidifying and hypoxia-mimicking device turn into a closed loop negative feedback system, with preferable control performance, in ring
Border condition variation and having still is accurately controlled under biological temporarily foster oxygen-depleted environment.
Claims (6)
1. a kind of Ocean acidification and hypoxia-mimicking device, it is characterised in that：
Air source of the gas is by being linked into the inputs of air mass flow amount controller (6), MAF control after air flue
The output end of device (6) processed is connected to exhaust solenoid valve (12), and the air after flow control is mixed with nitrogen, carbon dioxide
Close；
Nitrogen after decompression is passed into the input of nitrogen mass flow controllers (7), nitrogen mass flow controllers (7)
Output end be connected to exhaust solenoid valve (12), the nitrogen after flow control is mixed with air, carbon dioxide；
Carbon dioxide after decompression is passed into the input of carbon dioxide mass flow controller (8), carbon dioxide
The output end of mass flow controller (8) is connected to exhaust solenoid valve (12), by the carbon dioxide after flow control and sky
Gas, nitrogen mixing；
Exhaust solenoid valve (12) connection aeration valve group (13), controls mixed gas to be passed through aeration valve group (13), is aerated valve group
(13) connected with aeration ring (14), pass the gas through aeration ring (14) and water body is aerated；
Acquisition controller (9) connection dissolved oxygen measurement sensor (10) and pH measurement sensors (11), collection dissolved oxygen information and pH
Value information；Acquisition controller (9) connection air mass flow amount controller (6), nitrogen mass flow controllers (7), carbon dioxide
Mass flow controller (8), air flue and exhaust solenoid valve (12), control signal is sent to it, and gathers air matter simultaneously
Measure the feedback signal of flow controller (6), nitrogen mass flow controllers (7) and carbon dioxide mass flow controller (8), inspection
Survey working state of device.
2. Ocean acidification according to claim 1 and hypoxia-mimicking device, it is characterised in that：
The air flue is connected to the defeated of device for drying and filtering (5) including being air-dried filtering pressure reducer (1) by magnetic valve (3)
Enter end, air source of the gas is dried and particle filtering by being air-dried filtering pressure reducer (1), and will after being adjusted to pressure
Gas enters device for drying and filtering (5) afterwards by magnetic valve (3).
3. Ocean acidification according to claim 1 and hypoxia-mimicking device, it is characterised in that：
It is additionally included between magnetic valve (3) and device for drying and filtering (5) and carbon dioxide screen pipe (4) is set, magnetic valve (3) control is defeated
The air gone out is filtered out by carbon dioxide screen pipe (4) and is passed through device for drying and filtering (5) after carbon dioxide again.
4. Ocean acidification according to claim 1 and hypoxia-mimicking device, it is characterised in that：
The filtering pressure reducer (1) that is air-dried passes through back-up safety magnetic valve (2) connection aeration ring (14), acquisition controller
(9) connection back-up safety magnetic valve (2), when not being controlled or being broken down by sets target after system electrification, is controlled standby
Opened with security solenoid valve (2), air is exposed to water body.
5. Ocean acidification according to claim 1 and hypoxia-mimicking device, it is characterised in that：Aeration valve group (13) bag
Include one group of dissolved oxygen sensor and pH measurement sensors are inserted in 1 water body, the water body connects several by peristaltic pump (15)
Aeration ring (14) all the way is inserted in water body, each water body.
6. Ocean acidification according to claim 1 and hypoxia-mimicking device, it is characterised in that：Several described water bodys are 1
~6 water bodys.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108241394A (en) * | 2016-12-23 | 2018-07-03 | 中国科学院烟台海岸带研究所 | A kind of Ocean acidification and hypoxia-mimicking device and its control method |
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2016
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108241394A (en) * | 2016-12-23 | 2018-07-03 | 中国科学院烟台海岸带研究所 | A kind of Ocean acidification and hypoxia-mimicking device and its control method |
| CN108241394B (en) * | 2016-12-23 | 2023-09-22 | 中国科学院烟台海岸带研究所 | Ocean acidification and hypoxia simulation device and control method thereof |
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