CN107126813A - A kind of structure and control method of stepless varying duty pressure swing adsorption air separator - Google Patents
A kind of structure and control method of stepless varying duty pressure swing adsorption air separator Download PDFInfo
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- CN107126813A CN107126813A CN201710470771.0A CN201710470771A CN107126813A CN 107126813 A CN107126813 A CN 107126813A CN 201710470771 A CN201710470771 A CN 201710470771A CN 107126813 A CN107126813 A CN 107126813A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/047—Pressure swing adsorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/30—Particle separators, e.g. dust precipitators, using loose filtering material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/80—Water
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/06—Polluted air
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40007—Controlling pressure or temperature swing adsorption
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Abstract
The invention discloses a kind of structure and control method of stepless varying duty pressure swing adsorption air separator, including the air compressor being sequentially connected, air dryer, air cleaner, air cushioning tank, PSA air-separating plants, product gas surge tank and product stream gauge, product gas surge tank is communicated with product analysis instrument, and air compressor is connected with air；Product stream gauge is connected with product gas output channel, in addition to PLC, and PLC is connected with PSA air-separating plants, product gas surge tank, product stream gauge and product analysis instrument simultaneously.Invention increases automatic detection product gas pressure, product gas flow and product gas purity and electric signal is fully entered into PLC, analyzed and processed, it is determined that the real demand amount of instant product gas, automatic " STOPPING " step duration for calculating Load Regulation, realize that product purity is not raised and the decline of corresponding proportion air supply, so as to realize the energy-saving effect under reduction load condition.
Description
Technical field
The invention belongs to PSA Gas separation field, and in particular to a kind of stepless varying duty pressure swing adsorption air separation
The structure and control method of device.
Background technology
Pressure swing adsorption air separator produces nitrogen or oxygen, is current the most commonly used acquisition product nitrogen at normal temperatures
One of device of gas and oxygen.
But the pressure swing adsorption air separator of prior art, is usually free of the specific aim measure of Load Regulation.Once
The demand of product can cause the pressure rise in all-product line, transformation naturally less than flow at full capacity when user is Shi Jishiyong
Absorption air-separating plant is experienced after this pressure rise automatically, causes the reduction of flow, while can cause product purity
Automatic rise.This process is a kind of adaptive process, the result is that：The flow of device deviates and got over less than flow at full capacity
Many, the pressure of product can be higher, and the purity of product correspondingly also can be higher.Although product purity carries after this flow-reduction
Height, there is a small amount of energy-saving effect, but after being improved due to purity, the ratio of raw air amount and the product gas scale of construction also correspondingly rises
Height, even if in the case of reducing the product gas scale of construction, the consumption of compressed air can not press corresponding flow linearly
Reduction trend saves the energy, it is clear that the purity after flow-reduction is raised automatically, and this is a kind of waste of the energy.
The content of the invention
The technical problems to be solved by the invention are existing pressure swing adsorption air separator all pins without Load Regulation
Energy waste is caused to property measure, its object is to provide a kind of stepless varying duty pressure swing adsorption air separator structure and
Control method, the structure and control method are by reasonably controlling so that in the case of being basically unchanged of product purity, automatically
Step-less adjustment control is carried out, so as to save the consumption of the energy.
The present invention is achieved through the following technical solutions：
A kind of structure of stepless varying duty pressure swing adsorption air separator, including air compressor, the sky being sequentially connected
Gas dryer, air cleaner, air cushioning tank, PSA air-separating plants, product gas surge tank and product stream gauge, and
Product gas surge tank is communicated with product analysis instrument, and the air compressor is connected with air；Product stream gauge and product gas
Body output channel is connected, in addition to PLC, and PLC is buffered with PSA air-separating plants, product gas simultaneously
Tank, product stream gauge and the connection of product analysis instrument.Nitrogen or oxygen are produced using pressure-variable adsorption separation air assembly at present, are to work as
The modern the most commonly used device for obtaining product nitrogen gas and oxygen at normal temperatures, and pressure swing adsorption air separation process, not one
Straight is all that flow is run, it is necessary to according to the demand of user's product when actual use, if product when user is actual use at full capacity
Greater than flow at full capacity, now device is all oepration at full load, is not required to make any adjustments, once but user is real
The demand of product is less than flow at full capacity when border is used, and it can cause the pressure rise in all-product line naturally, due to transformation
Corresponding matching relationship is provided with inside absorption air-separating plant, when pressure swing adsorption air separator experiences this automatically
Plant after pressure rise, cause the reduction of flow, while the automatic rise of product purity can be caused.This process is a kind of adaptive
Process, the result is that：The flow of device deviates and more less than flow at full capacity, and the pressure of product can be higher, and product
Purity correspondingly also can be higher.Although the raising of product purity after this flow-reduction, has a small amount of energy-saving effect, due to pure
After degree is improved, the ratio of raw air amount and the product gas scale of construction is also correspondingly raised, even if reducing the situation of the product gas scale of construction
Under, the consumption of compressed air can not save the energy by corresponding flow-reduction trend linearly, it is clear that flow-reduction
Purity afterwards is raised automatically, and this is a kind of waste of the energy.And in some technical process, the purity of gas products is not got over
High better, too the product of high-purity can influence subsequently to use on the contrary, cause unnecessary trouble.And in some technical process (such as
Omnibus control system), product purity has limiting value, and product purity brings up to limiting value after flow-reduction, and purity is no longer improved,
And flow is still being reduced, this has resulted in the bigger waste of the energy.But current pressure swing adsorption air separator is not
Have and load is adjusted, cause the demand of product when user is Shi Jishiyong less than flow at full capacity, begin to energy occur
Source is wasted.In the prior art, the purity of the pressure of product gas, the flow of product gas and product gas, is all probably isolated
Instrument, it may be possible to type field, simply independently go observation pressure value, flow value and product purity, by observation respectively,
The running status of judgment means is gone, necessary human intervention operation, such as regulation purity, regulation flow etc. is carried out.Partial devices
Independent purity control valve, or product pressure maintaining valve, or flow control valve can be set, but the purpose of this control is to ensure dress
The purity put is not less than the purity of setting, or product pressure stabilization is more than setting value, or flow value does not allow more than volume
Definite value.And purity exceedes setting value, or product pressure is more than setting value, or user reduced using end traffic demand amount after draw
The purity rise risen, not such control can solve power saving, and carry out pointedly multi-parameter regulation control.Existing
In technology, the main purpose of PLC is, according to predetermined action sequence, to go to control the switch of the switch valve of more than 8
Action, so as to realize the purpose of pressure swing adsorption technique output products gas.
And the annexation of the present invention be perfect above-mentioned these measurement signals and PLC, all these signals with
PLC acceptable standard signal enter in PLC analyzed, computing, understand that device was required at that time
The actual negative charge values wanted.When finding that device load is less than rated load, PLC can send a signal, in device
Original " boosting --- absorption generation product gas --- press --- decompression regeneration --- pressing --- is boosted " so Zhou Erfu
In the circulation step of beginning, increase " STOPPING " step, i.e., step of " pausing ", the time length of the step is controlled by PLC
The calculated result of device processed is determined.Simultaneously as being possible to go out suddenly for the usage amount of product gas in view of user
Situation about now increasing, PLC be able to will be judged exactly according to the measurement signal being collected into, and existing side by side can do
Go out reaction, implement to increase the measure of gas production.Therefore, this load down, to increase load to rated output, realizes two-way tune
Section.
The control mode that this programme is provided, situation of the demand less than flow at full capacity of product when user is Shi Jishiyong
Under, the change of this demand reduction can be perceived by detection means, in the case of being basically unchanged of product purity, is entered automatically
Row step-less adjustment is controlled.Because product purity is not raised, identical purity level when stilling remain in full production, therefore it is former
The ratio of material air capacity and the product gas scale of construction does not also change correspondingly, so as to realize：As long as product gas flow is reduced, raw material
Reduce to the basic linear ratio of the demand of compressed air, so as to save the consumption of the energy.Its specific control method is：
Air is sequentially entered into air compressor, air dryer, air cleaner, air cushioning tank, PSA along pipeline
Air-separating plant, product gas surge tank and product stream gauge, a small amount of sample gas are entered in product analysis instrument, PLC controls
Device processed is to PSA air-separating plants, product gas surge tank, product gas pressure transmitter, product stream gauge and product analysis
Status information in instrument detected, the load condition in plant running, so as to issue instructions to PSA air-separating plants
In all switching valve, utilize " STOPPING " step, the set of time of this step obtained by the calculating of PLC,
The calculation formula of STOPPING durations is as follows：
(single column each cycle adsorbs duration+valve event interval to STOPPING durations (second)=metered flow of operating at full capacity x
Duration+ press duration)/actual measurement reduction load after sign flow-single column each cycle absorption duration-valve event interval when
It is long-to press duration,
Wherein：
Operate at full capacity metered flow --- the product stream value of design；
Single column each cycle adsorbs duration --- determined by the variety classes of molecular sieve；
Valve event interval duration --- consider the duration of valve event speed, according to valve species and the difference of bore,
For any one duration between 0 second, or 0~2 second；
Press duration --- the duration according to determined by different pressure swing adsorption technique conditions；
Sign flow after the reduction load of actual measurement --- it is the product gas instantaneous delivery of actual measurement, or in a period
Average discharge,
STOPPING durations be arranged on detect product purity it is below standard when, even if detecting traffic load has decline, this
Load down program can not be performed；
When any one following situation is detected, PLC can send instruction immediately, stop load down regulation
State, so that the state of the oepration at full load of recovery device immediately, so as to ensure the stabilization of device purity, adapts to user to product
The change operating mode needs quickly increased or decreased of gas demand：
(A) when PLC perceives when increasing to metered flow of product flow；
(B) when the pressure that PLC perceives product conveyance conduit be reduced to below rated pressure 0.005 to
During 0.015MPa, this value is set according to the field adjustable situation of device；
(C) when PLC is perceived：The product purity (%) of product purity difference (%)=actual measurement-user's license
During minimum product purity (%)=0, i.e. only when product purity is higher than the minimum product purity that user permits, can hold
The energy-conservation program of row reduction load.
Product gas pressure transmitter, and product gas pressure are provided between product gas surge tank and PLC
Transmitter is connected with product gas surge tank and PLC simultaneously, and product gas pressure transmitter electric signal is controlled with PLC
Device is connected.Be provided with two or more adsorption towers in PSA air-separating plants, and adsorption tower with air cushioning tank
With the connection of product gas surge tank.Correspondingly, it is provided with the control switching valve of six or more.All control switching valves,
Receive the control of PLC, between PLC and control switching valve, be connected control with electric signal.Air cleaner
At least one, when air cleaner quantity is more than one, it is separately positioned between air compressor and air dryer,
Between air dryer and air cushioning tank, and it is sequentially communicated.The entrance of product stream gauge is connected with product gas surge tank,
Product stream gauge electricity consumption signal is connected with PLC, gas sample mouthful and product gas surge tank and the production of product analysis instrument
The pipeline of product flowmeter connection is connected, and the electric signal of product analysis instrument is connected with PLC.Pass through above-mentioned various telecommunications
Just can (pressure, flow and product be pure according to each detection means summary information in connection number with PLC, PLC
Degree), the load condition analyzed in plant running can be calculated, so as to issue instructions to institute in PSA air-separating plants
Some programme-control switching valves, in original running at full capacity control program, increase " STOPPING " step, this step
Set of time by PLC calculating obtained by, its time span can be it is stepless, so as to realize step-less adjustment bear
Lotus.In this regulation control process, " STOPPING " Step Time that PLC is sent is longer, illustrates the load of device
Smaller, the time of air compressor load down unloading operation is also longer, or the air capacity asked for from compressed air pipe network is fewer, from
And the purpose of energy-conservation can be realized.The continuous output of product gas after " STOPPING " step performs stage, reduction load,
Dependent on the product gas surge tank set in system.Therefore the maximum stepless varying duty adjustable range of such device can reach
30~100%.
The present invention compared with prior art, has the following advantages and advantages：
(1) automatic detection product gas pressure, product gas flow and product gas purity are added and electric signal is complete
Portion inputs PLC, is analyzed and processed, it is determined that the real demand amount of product gas immediately, calculates Load Regulation automatically
" STOPPING " step duration, realize that product purity is not raised and the decline of corresponding proportion air supply, so as to realize drop
Energy-saving effect in the case of underload；
(2) in the case where device flow is not done and changed, by the renewal of detection means, and corresponding electric signal and control
The connection of system processed, is reasonably calculated, the mode of output control signal, realizes that pressure swing adsorption air separator load is adjusted
The function of section；
(3) in the case where pressure swing adsorption air separator hardly increases purchase cost, it is possible to achieve user uses
It is long-term energy-saving in process.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is schematic flow sheet of the present invention.
Mark and corresponding parts title in accompanying drawing：
1- air compressors, 2- air dryers, 3- air cleaners, 4- air cushioning tanks, 5-PSA air separation dress
Put, 6- product gas surge tanks, 6P- product gas pressure transmitters, 7- product stream gauge, 8- product analysis instrument, 9-PLC controls
Device.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and accompanying drawing, to this
Invention is described in further detail, and exemplary embodiment and its explanation of the invention is only used for explaining the present invention, does not make
For limitation of the invention.
Embodiment 1：
As shown in figure 1, a kind of structure of stepless varying duty pressure swing adsorption air separator, its hardware configuration is included successively
The air compressor 1 of connection, air dryer 2, air cleaner 3, air cushioning tank 4, PSA air-separating plants 5, product gas
Body surge tank 6 and product stream gauge 7, and product gas surge tank 6 is communicated with product analysis instrument 8, the gas of product analysis instrument 8 takes
The pipeline that sample mouthful is connected with product gas surge tank 6 and product stream gauge 7 is connected, and air compressor 1 is connected with air,
Extract ambient air, the unstrpped gas separated after compression as air；Product stream gauge 7 is connected with product gas output channel
Connect, the entrance of product stream gauge 7 is connected with product gas surge tank 6, PLC 9 simultaneously with PSA air-separating plants 5,
Product gas surge tank 6, product stream gauge 7 and product analysis instrument 8 are connected, and product analysis instrument 8 and product stream gauge 9 all use telecommunications
Number it is connected with PLC, product gas pressure transmitter is also provided between product gas surge tank 6 and PLC 9
6P, and product gas pressure transmitter 6P, while being connected with product gas surge tank 6 and PLC 9, product gas pressure becomes
Device 6P electric signals are sent to be connected with PLC 9.Wherein air cleaner 3 is at least one, when air cleaner 3 is one,
It is arranged between air dryer 2 and air cushioning tank 4, and when the quantity of air cleaner 3 is more than one, it is separately positioned on
Between air compressor 1 and air dryer 2, between air dryer 2 and air cushioning tank 4, form air compressor 1, it is empty
Air filter 3, air dryer 2, air cleaner 3 and air cushioning tank 4 are sequentially communicated.Wherein air cleaner 3 can be with
It is the filter of Chalk-dust filtering type or the active carbon filter with removing lube vapor function.In the separation
In device, two or more adsorption towers are provided with, correspondingly, the control switching valve of six or more are provided with.It is all
Control switching valve, receive the programme-control of PLC, PLC and control switching valve between, use electric signal phase
Connection control., just can be according to each detection means in PLC by the connection of above-mentioned various electric signals and PLC
Summary information (pressure, flow and product purity), can calculate the load condition analyzed in plant running, so as to send
Instruct to control switching valve all in PSA air-separating plants, in original running at full capacity control program, increase by one
" STOPPING " step, the set of time of this step obtained by the calculating of PLC, its time span can be it is stepless,
So as to realize step-less adjustment load.In this regulation control process, during " STOPPING " step that PLC is sent
Between it is longer, illustrate that the load of device is smaller, the time of air compressor load down unloading operation is also longer, or from compressed air hose
The air capacity that rete cord takes is fewer, so as to realize the purpose of energy-conservation.The maximum stepless varying duty adjustable range of such device can
To reach 30~100%.When PLC perceives the unexpected increase of product flow, or pressure quick reduction, or purity goes out
Existing downward trend, instruction can be sent immediately, stop load down adjustment state, so that the oepration at full load of recovery device immediately
State, so as to ensure the stabilization of device purity, adapt to the change that quickly increases or decreases of the user to product gas demand
Operating mode needs.
Its specific control method is：Air is sequentially entered into air compressor 1, air dryer 2, air along pipeline
Filter 3, air cushioning tank 4, PSA air-separating plants 5, product gas surge tank 6 and product stream gauge 7, and enter production
In product analyzer 8, PLC 9 is to PSA air-separating plants 5, product gas surge tank 6, product gas pressure transmitter
Status information in 6P, product stream gauge 7 and product analysis instrument 8 detected, the load condition in plant running, so that
Switching valves all in PSA air-separating plants 5 are issued instructions to, " STOPPING " step, the set of time of this step is utilized
Obtained by the calculating of PLC 9, the calculation formula of STOPPING durations is as follows：
(single column each cycle adsorbs duration+valve event interval to STOPPING durations (second)=metered flow of operating at full capacity x
Duration+ press duration)/actual measurement reduction load after sign flow-single column each cycle absorption duration-valve event interval when
It is long-to press duration,
Wherein：
Operate at full capacity metered flow --- the product stream value of design；
Single column each cycle adsorbs duration --- determined by the variety classes of molecular sieve；
Valve event interval duration --- consider the duration of valve event speed, according to valve species and the difference of bore,
For any one duration between 0 second, or 0~2 second；
Press duration --- the duration according to determined by different pressure swing adsorption technique conditions；
Sign flow after the reduction load of actual measurement --- can be the product gas instantaneous delivery or one of actual measurement
Average flow rate value in the individual period.It can specifically be determined according to the product gas of user using characteristic, i.e. for continuous steady
Surely gas is used, simply occurs the occasion of stable low discharge once in a while, gas instantaneous delivery value can be used；And for long-term with gaseity
Occasion in fluctuation status, the sign flow that the flow value of low flow state in short-term can not be run as load down.Only
Underrun state is in certain period of time for a long time when PLC is detected, then can be by the average discharge in the period
The sign flow that value is run as load down.
STOPPING durations be arranged on detect product purity it is below standard when, even if detecting traffic load has decline, this
Load down program can not be performed；
(2) any one situation is detected in (A), (B), (C) below, and PLC 9 can send finger immediately
Order, stops load down adjustment state, so that the state of the oepration at full load of recovery device immediately, so as to ensure the steady of device purity
It is fixed, adapt to the change operating mode needs that quickly increase or decrease of the user to product gas demand：
(A) when PLC perceives when increasing to metered flow of product flow；
(B) when the pressure that PLC perceives product conveyance conduit is reduced to a certain value below rated pressure, this value
Set according to the field adjustable situation of device；
(C) when PLC is perceived：The product purity (%) of product purity difference (%)=actual measurement-user's license
During minimum product purity (%)=0, i.e. only when product purity is higher than the minimum product purity that user permits, can hold
The energy-conservation program of row reduction load.
For example：When device carries out making nitrogen by pressure swing adsorption, its metered flow of operating at full capacity is set as 100Nm3/ h, product
Nitrogen gas purity 99.9%, the minimum product purity 99.8% of user's license, product pressure 0.6MPag.Process conditions are：Single column is every
Cycle absorption duration 60 seconds, valve event interval duration 1 second presses duration 3 seconds.
1. when detecting the flow value stabilization in device 2 minutes in 90Nm3During/h, implement load down energy-conservation program
STOPPING duration calculations are as follows,
According to calculating formula：
(single column each cycle adsorbs duration+valve event interval to STOPPING durations (second)=metered flow of operating at full capacity x
Duration+ press duration)/actual measurement reduction load after sign flow-single column each cycle absorption duration-valve event interval when
Duration grow-is pressed, i.e.,
100x(60+1+3)/90-60-1-3
=7.1 (seconds)
That is PLC can send instruction implement STOPPING steps when a length of 7.1 seconds；
2. when detecting the flow value stabilization in device 2 minutes in 80Nm3During/h, implement load down energy-conservation program
STOPPING duration calculations are as follows,
According to calculating formula：
STOPPING durations (second)=100x (60+1+3)/80-60-1-3=16 (second)
That is PLC can send instruction implement STOPPING steps when a length of 16 seconds；
3. when detecting the flow value stabilization in device 2 minutes in 70Nm3During/h, implement load down energy-conservation program
STOPPING duration calculations are as follows,
According to calculating formula：
STOPPING durations (second)=100x (60+1+3)/70-60-1-3=27.4 (second)
That is PLC can send instruction implement STOPPING steps when a length of 27.4 seconds；
4. when detecting the flow value stabilization in device 2 minutes in 60Nm3During/h, implement load down energy-conservation program
STOPPING duration calculations are as follows,
According to calculating formula：
STOPPING durations (second)=100x (60+1+3)/60-60-1-3=42.7 (second)
That is PLC can send instruction implement STOPPING steps when a length of 42.7 seconds；
5. when detecting the flow value stabilization in device 2 minutes in 50Nm3During/h, implement load down energy-conservation program
STOPPING duration calculations are as follows,
According to calculating formula：
STOPPING durations (second)=100x (60+1+3)/50-60-1-3=64 (second)
That is PLC can send instruction implement STOPPING steps when a length of 64 seconds；
6. when detecting the flow value stabilization in device 2 minutes in 30Nm3During/h, implement load down energy-conservation program
STOPPING duration calculations are as follows,
According to calculating formula：
STOPPING durations (second)=100x (60+1+3)/30-60-1-3=149.3 (second)
That is PLC can send instruction implement STOPPING steps when a length of 149.3 seconds.
Calculate above for being all suitable under any actual flow loading condiction, and be continuous, therefore be a kind of stepless
The method of regulation.But it is not recommended that still carrying out this load down program below 30% load, it otherwise will appear from product gas pure
The reduction of degree.
Above example, (can set), or work as when finding that product pressure is less than 0.59MPag according to field adjustable situation
It was found that product purity (can be set) when being reduced to the 99.8% of user's license according to the requirement of user, i.e. product purity difference (%)
During minimum product purity (%)=99.8%-99.8%=0 of the product purity (%) of=actual measurement-user's license, PLC
Instruction will be sent, stops load down operation program immediately, and returns to oepration at full load program first, while in follow-up detection
During, further according to new burden requirement, implement new spatial load forecasting, so as to reach the purity under new load down state, pressure
The balance of power and flow.
Embodiment 2：
On the basis of above-described embodiment, two or more adsorption towers are provided with PSA air-separating plants 5,
And adsorption tower is connected with air cushioning tank 4 and product gas surge tank 6.Adsorbent is filled with each adsorption tower, is inhaled
Attached dose of species difference, this programme had both been applicable to adsorbent adsorption of oxygen, has produced the device of nitrogen, was equally applicable to adsorbent suction
Attached nitrogen, the device for producing oxygen.That is swing adsorption nitrogen producing apparatus and the applicable this programme of pressure swing adsorption oxygen making device.
For example：When device carries out omnibus control system, metered flow of operating at full capacity is 50Nm3/ h, product oxygen is pure
Degree 93%, product pressure 0.4MPag.Process conditions are：Single column each cycle absorption duration 75 seconds, valve event interval duration 1 second,
Press duration 15 seconds.
1. when detecting the flow value stabilization in device 3 minutes in 50Nm3During/h, implement load down energy-conservation program
STOPPING duration calculations are as follows,
According to calculating formula：
(single column each cycle adsorbs duration+valve event interval to STOPPING durations (second)=metered flow of operating at full capacity x
Duration+ press duration)/actual measurement reduction load after sign flow-single column each cycle absorption duration-valve event interval when
Duration grow-is pressed, i.e.,
50x(75+1+15)/50-75-1-15
=0 (second)
That is PLC can send instruction implement STOPPING steps when a length of 0 second, i.e., do not reduce load；
2. when detecting the flow value stabilization in device 3 minutes in 40Nm3During/h, implement load down energy-conservation program
STOPPING duration calculations are as follows,
According to calculating formula：
STOPPING durations (second)=50x (75+1+15)/40-75-1-15=22.8 (second)
That is PLC can send instruction implement STOPPING steps when a length of 22.8 seconds；
3. when detecting the flow value stabilization in device 3 minutes in 30Nm3During/h, implement load down energy-conservation program
STOPPING duration calculations are as follows,
According to calculating formula：
STOPPING durations (second)=50x (75+1+15)/30-75-1-15=60.7 (second)
That is PLC can send instruction implement STOPPING steps when a length of 60.7 seconds；
4. when detecting the flow value stabilization in device 3 minutes in 15Nm3During/h, implement load down energy-conservation program
STOPPING duration calculations are as follows,
According to calculating formula：
STOPPING durations (second)=50x (75+1+15)/15-75-1-15=212.3 (second)
That is PLC can send instruction implement STOPPING steps when a length of 212.3 seconds；
Calculate above for being all suitable under any actual flow loading condiction, and be continuous, therefore be a kind of stepless
The method of regulation.Similarly for pressure swing adsorption oxygen making device also it is not recommended that still carrying out this load down journey below 30% load
Sequence, otherwise will appear from the reduction of product gas purity.
Above example, (can set), or work as when finding that product pressure is less than 0.39MPag according to field adjustable situation
It was found that product purity be reduced to user license 90% when (can be set according to the requirement of user), i.e., product purity difference (%)=
During minimum product purity (%)=90%-90%=0 of the product purity (%) of actual measurement-user's license, PLC will be sent
Instruction, stops load down operation program immediately, and returns to oepration at full load program first, while in follow-up detection process
In, further according to new burden requirement, implement new spatial load forecasting so that reach the purity under new load down state, pressure with
The balance of flow.
Embodiment 3：
On the basis of above-described embodiment, this programme applies also for vacuum pressure swing adsorption device for oxygen production, this kind of technical process
During the desorption and regeneration of adsorption tower, vavuum pump has been used to carry out vacuumize process, other principles and pressure swing adsorption air point
Identical from principle of device, the implementation method of this programme is identical.
Above-described embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc. all should be included
Within protection scope of the present invention.
Claims (7)
1. a kind of structure of stepless varying duty pressure swing adsorption air separator, it is characterised in that including the air being sequentially connected
Compressor (1), air dryer (2), air cleaner (3), air cushioning tank (4), PSA air-separating plants (5), product gas
Body surge tank (6) and product stream gauge (7), and product gas surge tank (6) is communicated with product analysis instrument (8), the air pressure
Contracting machine (1) is connected with air；Product stream gauge (7) is connected with product gas output channel, in addition to PLC (9),
PLC (9) with PSA air-separating plants (5), product gas surge tank (6), product stream gauge (7) and product while divide
Analyzer (8) is connected.
2. a kind of structure of stepless varying duty pressure swing adsorption air separator according to claim 1, it is characterised in that
Product gas pressure transmitter (6P), and product gas are provided between the product gas surge tank (6) and PLC (9)
Body pressure transmitter (6P) with product gas surge tank (6) and PLC (9) while be connected.
3. a kind of structure of stepless varying duty pressure swing adsorption air separator according to claim 1, it is characterised in that
Be provided with two or more adsorption towers in the PSA air-separating plants (5), and adsorption tower with air cushioning tank
(4) connected with product gas surge tank (6).
4. a kind of structure of stepless varying duty pressure swing adsorption air separator according to claim 1, it is characterised in that
The air cleaner (3) is at least one, and when air cleaner (3) quantity is more than one, it is separately positioned on air pressure
Between contracting machine (1) and air dryer (2), between air dryer (2) and air cushioning tank (4), and it is sequentially communicated.
5. a kind of knot of stepless varying duty pressure swing adsorption air separator as claimed in any of claims 1 to 4
Structure, it is characterised in that the entrance of the product stream gauge (7) is connected with product gas surge tank (6).
6. a kind of structure of stepless varying duty pressure swing adsorption air separator according to claim 5, it is characterised in that
The pipeline that the gas sample mouthful of the product analysis instrument (8) is connected with product gas surge tank (6) and product stream gauge (7) is connected
Connect.
7. a kind of control method of stepless varying duty pressure swing adsorption air separator, it is characterised in that comprise the following steps：
(1) air sequentially enters air compressor (1), air dryer (2), air cleaner (3), air cushioning along pipeline
Tank (4), PSA air-separating plants (5), product gas surge tank (6) and product stream gauge (7), sample gas enters product
In analyzer (8), PLC (9) becomes to PSA air-separating plants (5), product gas surge tank (6), product gas pressure
The status information in device (6P), product stream gauge (7) and product analysis instrument (8) is sent to be detected, it is negative in plant running
Lotus situation, so as to issue instructions to switching valves all in PSA air-separating plants (5), utilizes " STOPPING " step, this step
Rapid set of time is obtained by the calculating of PLC (9), and the calculation formula of STOPPING durations is as follows：
(single column each cycle adsorbs duration+valve event interval duration to STOPPING durations (second)=metered flow of operating at full capacity x
+ press duration)/the sign flow reduced after load surveyed-single column each cycle absorption duration-valve event interval duration-
Press duration,
Wherein：
Operate at full capacity metered flow --- the product stream value of design；
Single column each cycle adsorbs duration --- determined by the variety classes of molecular sieve；
Valve event interval duration --- consider the duration of valve event speed, be 0 according to valve species and the difference of bore
Second, or any one duration between 0~2 second；
Press duration --- the duration according to determined by different pressure swing adsorption technique conditions；
Sign flow after the reduction load of actual measurement --- for the product gas instantaneous delivery of actual measurement, or putting down in a period
Equal flow,
STOPPING durations be arranged on detect product purity it is below standard when, even if detecting traffic load has decline, this drop is negative
Lotus program can not be performed；
(2) any one situation is detected below, and PLC (9) can send instruction immediately, stops load down regulation
State, so that the state of the oepration at full load of recovery device immediately, it is ensured that the stabilization of device purity, adapts to user to product gas
The change operating mode needs quickly increased or decreased of demand：
(A) when PLC perceives when increasing to metered flow of product flow；
(B) when the pressure that PLC perceives product conveyance conduit is reduced to 0.005 to 0.015MPa below rated pressure
When；
(C) when PLC is perceived：It is minimum that the product purity (%) of product purity difference (%)=actual measurement-user permits
During product purity (%)=0, i.e. only when product purity is higher than the minimum product purity that user permits, drop can be performed
The energy-conservation program of underload.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710470771.0A CN107126813A (en) | 2017-06-20 | 2017-06-20 | A kind of structure and control method of stepless varying duty pressure swing adsorption air separator |
| TW107115710A TWI657856B (en) | 2017-06-20 | 2018-05-09 | Structure and control method of stepless variable load pressure swing adsorption air separation device |
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| CN201710470771.0A CN107126813A (en) | 2017-06-20 | 2017-06-20 | A kind of structure and control method of stepless varying duty pressure swing adsorption air separator |
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| TW (1) | TWI657856B (en) |
Cited By (4)
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| CN111921338A (en) * | 2020-07-31 | 2020-11-13 | 苏州成于思气体科技有限公司 | Energy-saving equipment of PSA gas separation system |
| CN112495137A (en) * | 2020-11-12 | 2021-03-16 | 杭州汉德空分设备有限公司 | Pressure swing adsorption oxygen generating equipment |
| CN114659028A (en) * | 2022-03-23 | 2022-06-24 | 乔治洛德方法研究和开发液化空气有限公司 | Method and apparatus for controlling gas supply of gas supply system |
| CN114768470A (en) * | 2022-05-09 | 2022-07-22 | 上海瑞气气体科技有限公司 | Pressure swing adsorption gas separation equipment and method, and regulation metering control system and method |
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| CN114768470A (en) * | 2022-05-09 | 2022-07-22 | 上海瑞气气体科技有限公司 | Pressure swing adsorption gas separation equipment and method, and regulation metering control system and method |
| CN114768470B (en) * | 2022-05-09 | 2024-01-26 | 上海瑞气气体科技有限公司 | Pressure swing adsorption gas separation equipment and method, and metering adjustment control system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI657856B (en) | 2019-05-01 |
| TW201904647A (en) | 2019-02-01 |
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