CN108778466A - Pressure swing adsorption formula gas manufacturing plants - Google Patents
Pressure swing adsorption formula gas manufacturing plants Download PDFInfo
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- CN108778466A CN108778466A CN201780020689.6A CN201780020689A CN108778466A CN 108778466 A CN108778466 A CN 108778466A CN 201780020689 A CN201780020689 A CN 201780020689A CN 108778466 A CN108778466 A CN 108778466A
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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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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
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- General Chemical & Material Sciences (AREA)
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- Separation Of Gases By Adsorption (AREA)
Abstract
The present invention provides a kind of pressure swing adsorption formula gas manufacturing plants for the rate of recovery that can improve refined object gas about the concentration of each variation in the case of the variation of the concentration of the refined object gas of unstrpped gas.It is configured to, about multiple adsorption towers（1）Each, make phase differently successively carry out operation cycle operation control section be based on detection unstrpped gas（G）Refined object gas concentration raw gas concentration test section（SG）Detection information, in order to will be unstrpped gas（G）To adsorption tower（1）The unstrpped gas supply pressure of supply is adjusted to the goal pressure accordingly determined with the concentration of the refined object gas of unstrpped gas, adjusts pressure adjustment unit（10）, aforementioned adjustment pressure adjustment unit（10）Unstrpped gas supply pressure is adjusted, aforementioned operation cycle includes absorption process and desorption step, and preceding adsorption process supplies road from across unstrpped gas（3）The unstrpped gas of supply（G）Absorption impurity gas comes across product gas discharge path（5）Refined object gas is discharged, impurity gas is passed through exhaust gas discharge path by aforementioned desorption step（4）To be discharged.
Description
Technical field
The present invention relates to a kind of pressure swing adsorption formula gas manufacturing plants, aforementioned pressure changes absorption type gas manufacture dress
It sets for adsorbing abovementioned dopant gases to fill from the unstrpped gas of impurity gas including refined object gas and its in addition
The mode of adsorption piece and so that unstrpped gas supply road and exhaust gas discharge path connect with one end and make product gas discharge path
Each for multiple adsorption towers that the mode being connect with another side is arranged, being provided with makes phase differently carry out operating week successively
The operation control section of phase, aforementioned operation cycle include absorption process and desorption step, and preceding adsorption process is from across aforementioned raw material
The aforementioned raw material gas absorption abovementioned dopant gases of gas supply road supply come will be refined pair across before-mentioned products gas discharge path
As gas discharge, abovementioned dopant gases are discharged aforementioned desorption step across aforementioned exhaust gas discharge path.
Background technology
The pressure swing adsorption formula gas manufacturing plants are by making the adsorption piece of adsorption tower adsorb mixing contained by unstrpped gas
Miscellaneous gas can manufacture the higher product gas of concentration of refined object gas (referring for example to patent document 1.).
In patent document 1, it as unstrpped gas, records containing the hydrogen as refined object gas and containing an oxidation
The hydrogen-containing gas as impurity gas such as carbon, carbon dioxide and methane.
Incidentally, previous though omitting detailed description in patent document 1, generally by unstrpped gas to adsorption tower
The supply pressure (so-called adsorption pressure) of supply maintains the constant pressure accordingly determined with the type of unstrpped gas etc..
Patent document 1:Japanese Unexamined Patent Publication 2016-2531 bulletins.
In pressure swing adsorption formula gas manufacturing plants, the refined object gas contained by unstrpped gas cannot all be returned
It receives, it may be desirable to improving the rate of recovery of the refined object gas contained by unstrpped gas.
However, it is previous, it will consistently be maintained to the pressure of adsorption tower base feed gas (adsorption pressure), so in unstripped gas
In the case of the concentration variation of the refined object gas of body, about the concentration of each variation, returning for refined object gas cannot be improved
Yield.
Invention content
The present invention is in view of made by above-mentioned actual conditions, it is intended that providing a kind of in the refined of unstrpped gas
The pressure of the rate of recovery of refined object gas can be improved in the case of the concentration variation of object gas about the concentration of each variation
Change absorption type gas manufacturing plants.
The present invention pressure swing adsorption formula gas manufacturing plants for filling from containing refined object gas and its with
The unstrpped gas of outer impurity gas adsorbs the mode of the adsorption piece of abovementioned dopant gases and so that unstrpped gas supplies road and gives up
Multiple adsorption towers that gas discharge path is connect with one end and the mode that makes product gas discharge path be connect with another side is arranged
Each, be provided with make phase differently successively carry out operation cycle operation control section, aforementioned operation cycle include absorption
Process and desorption step, preceding adsorption process are aforementioned from the aforementioned raw material gas absorption supplied across aforementioned raw material gas supply road
Impurity gas across before-mentioned products gas discharge path product gas is discharged, and aforementioned desorption step passes through abovementioned dopant gases
Aforementioned exhaust gas discharge path is discharged, which is characterized in that is provided with pressure adjustment unit and raw gas concentration test section, aforementioned pressure
Adjustment section adjustment supplies the unstrpped gas supply pressure of aforementioned raw material gas, aforementioned original in preceding adsorption process to aforementioned adsorption tower
The concentration for expecting the aforementioned refined object gas of gas concentration test section detection aforementioned raw material gas, before aforementioned operation control section is based on
The detection information for stating raw gas concentration test section, in order to which aforementioned raw material gas supply pressure to be adjusted to and aforementioned raw material gas
The goal pressure that the concentration of aforementioned refined object gas accordingly determines adjusts aforementioned pressure adjustment section.
That is, detection information of the operation control section based on raw gas concentration test section adjusts pressure adjustment unit, inhaling as a result,
Attached process is adjusted to and the refined object gas of unstrpped gas to the unstrpped gas supply pressure of adsorption tower base feed gas
The goal pressure that concentration accordingly determines.
In this way, unstrpped gas supply pressure be adjusted to the concentration of the refined object gas of unstrpped gas accordingly determine
Goal pressure, even if the concentration variation of the refined object gas of unstrpped gas as a result, can improve the concentration of each variation
The rate of recovery of refined object gas.
If being illustrated, the present inventor improves sharp study, finds following the description：In the refined of unstrpped gas
In the case of the concentration variation of object gas, for the concentration of each variation, unstrpped gas supply pressure (being equivalent to adsorption pressure) is made to become
Pressure appropriate is turned to, thus, it is possible to improve the rate of recovery of the refined object gas of the concentration of each variation.
That is, finding following content：Concentration in the refined object gas of unstrpped gas is lower, it is preferable that makes
The adsorption piece that a large amount of impurity gas are filled in adsorption tower suitably adsorbs, and unstrpped gas supply pressure is made (to be equivalent to absorption
Pressure) it is higher pressure, but, with concentration relatively low situation higher in the concentration of the refined object gas of unstrpped gas
Compared to making unstrpped gas supply pressure (being equivalent to adsorption pressure) be lower pressure, thus, it is possible to improve the recycling of refined object gas
Rate.
The reason is because the concentration in the refined object gas of unstrpped gas is higher, if relatively low with concentration
The case where in the same manner, it is higher pressure to make unstrpped gas supply pressure (being equivalent to adsorption pressure), then contains refined pair with high concentration
The quantitative change for the inside that adsorption tower is filled in absorption process as the unstrpped gas of gas is more, such to contain essence with high concentration
The unstrpped gas of object gas processed is discharged across exhaust gas discharge path as exhaust gas in large quantities in desorption step.
Therefore, by the refined object gas of the goal pressure of unstrpped gas supply pressure (being equivalent to adsorption pressure) and unstrpped gas
The variation of concentration accordingly determine, unstrpped gas supply pressure (being equivalent to adsorption pressure) is adjusted to refined pair with unstrpped gas
It can be carried as the corresponding goal pressure of the concentration of gas, if even if thus the concentration of the refined object gas of unstrpped gas changes
The rate of recovery of the refined object gas for the concentration that height respectively changes.
In short, the technical solution of pressure swing adsorption formula gas manufacturing plants according to the present invention, in the essence of unstrpped gas
In the case of the concentration variation of object gas processed, about the concentration of each variation, the rate of recovery of refined object gas can be improved.
Another technical solution of the pressure swing adsorption formula gas manufacturing plants of the present invention is characterized in that aforementioned operating is controlled
The concentration of aforementioned refined object gas of the portion processed based on aforementioned raw material gas and the aforementioned refined object being discharged from aforementioned adsorption tower
At least one party of the concentration of gas will carry out the adsorption time change and adjustment of preceding adsorption process.
That is, the concentration of refined object gas of the operation control section based on unstrpped gas and the refined object being discharged from adsorption tower
At least one party of the concentration of gas changes the adsorption time for carrying out absorption process, so even if the refined object gas of unstrpped gas
Concentration variation of body etc. can also maintain the concentration for the refined object gas being discharged across product gas discharge path at appropriate
Concentration.
That is, for example, the concentration of the refined object gas of unstrpped gas the low more adsorption time is made to change with shortening, similarly
The the concentration of the refined object gas for the product gas being discharged from adsorption tower the low more adsorption time is made to change with shortening, thus, it is possible to
The concentration for the refined object gas being discharged from adsorption tower is suitably maintained.
Incidentally, can also be the concentration of the refined object gas based on unstrpped gas and the production being discharged from adsorption tower
The the concentration of the refined object gas of product gas the low more adsorption time is made to shorten with the concentration of the refined object gas of unstrpped gas
The mode that changes of mode under, adsorption time is set with feedovering, and with the refined object for the product gas being discharged from adsorption tower
Under the mode that the concentration of gas the low more the mode that makes adsorption time shorten changes, adsorption time is corrected on feedback ground.
It, can will be from suction in short, another technical solution of pressure swing adsorption formula gas manufacturing plants according to the present invention
The concentration of the refined object gas of attached tower discharge is maintained into concentration appropriate.
Another technical solution of pressure swing adsorption formula gas manufacturing plants of the present invention is characterized in that, aforementioned raw material gas
Body is to pass through before-mentioned products gas to arrange containing 50% or more the gas containing methane as the methane of aforementioned refined object gas
The before-mentioned products gas of outlet discharge is the product gas containing 80% or more methane.
That is, can will containing 50% or more as refined object gas methane it is excellent with organic efficiency containing methane gas
Metachromatic state is refined into the product gas containing 80% or more methane.
Incidentally, as the gas containing methane, biogas, coal bed gas, natural gas etc., biogas can be enumerated
It, also can be with e.g. containing 70% or so methane, the gas containing 30% or so carbon dioxide, but about such biogas
High organic efficiency is refined into the product gas containing 80% or more methane.
In short, another technical solution according to the present invention, can will contain 50% or more the methane as refined object gas
Containing methane gas with high organic efficiency, be refined into the product gas containing 80% or more methane.
Description of the drawings
Fig. 1 is the skeleton diagram for indicating pressure swing adsorption formula gas manufacturing plants.
Fig. 2 is the block diagram for indicating control structure.
Fig. 3 is the table for indicating operation cycle.
Fig. 4 is the table for indicating the relationship of methane concentration and process correction value in unstrpped gas.
Fig. 5 is the table for the action for indicating adsorption time correction value.
Fig. 6 is the table of the relationship of methane concentration and process correction value in the product gas for indicate the 2nd embodiment.
Fig. 7 is the table of the action for the adsorption time correction value for indicating the 2nd embodiment.
Fig. 8 is the table of the relationship of methane concentration and process correction value in the unstrpped gas for indicate the 3rd embodiment.
Fig. 9 is the table of the relationship of methane concentration and process correction value in the product gas for indicate the 3rd embodiment.
Figure 10 is the table of the action for the adsorption time correction value for indicating the 3rd embodiment.
Figure 11 is the chart for indicating the relationship of methane concentration and unstrpped gas supply pressure in unstrpped gas.
Specific implementation mode
(the 1st embodiment)
Hereinafter, being based on attached drawing, embodiments of the present invention will be described.
(overall structures of pressure swing adsorption formula gas manufacturing plants)
In the present embodiment, it is configured to, unstrpped gas G is to contain 50% or more methane to be used as refined object gas, contain air
As the coal bed gas of impurity gas, impurity gas is adsorbed by the adsorption piece of adsorption tower 1, the methane gas containing 90% or more methane
It is discharged from adsorption tower 1 as product gas H.
That is, the main component of the coal bed gas as unstrpped gas G is methane and air, for example, methane containing ratio is 70% left
It is right.Also, the pressure swing adsorption formula gas manufacturing plants of present embodiment are for example configured to, and carry out for obtaining containing 90%
The gas purification of the product gas H of the above methane.
Incidentally, as the adsorption piece for being filled in adsorption tower 1, can use with from activated carbon, carbon molecular sieve, zeolite,
At least one material adsorption piece as main component selected in porous metal complex.In the present embodiment, such as
It is 0.38nm or more to use with the fine pore that MP methods measure, the pore volume of its fine pore is no more than 0.01cm3/ g and fine pore
The pore volume of 0.34nm is 0.20cm3The carbon molecular sieve of/g or more.
As shown in Figure 1, as four adsorption towers 1, setting A towers, B towers, C towers, D towers, the lower end side connection of four adsorption towers 1
There are unstrpped gas supply road 3 and exhaust gas discharge path 4, aforementioned raw material gas to supply the supply of road 3 by the compression as raw material boosting section
Exhaust gas is discharged in the unstrpped gas G that machine 2 boosts, aforementioned exhaust gas discharge path 4.
Also, with four adsorption towers 1 each accordingly, be provided with the unstripped gas for being opened and closed unstrpped gas supply road 3
Body supply valve A1, B1, C1, D1 and exhaust exit valve A5, B5, C5, the D5 for being opened and closed exhaust gas discharge path 4.
In the present embodiment, the gas tank T for stockpiling exhaust gas is provided at exhaust gas discharge path 4.Incidentally, gas tank
The inside pressure of T will be discharged across exhaust gas discharge path 4 from adsorption tower 1 for the pressure close to atmospheric pressure in aftermentioned desorption step
Exhaust gas stockpile.
In addition, the exhaust gas for being accumulated in gas tank T be supplied in the combustion section of each purposes burn or as recycle gas
Body is used.
The downstream side that the compressor 2 on road 3 is supplied in unstrpped gas, is provided with pressure sensor 11, aforementioned pressure sensor
11 detect pressure, that is, unstrpped gas supply pressure by 2 base feed gas G of compressor.
Incidentally, the unstrpped gas G to be boosted from compressor 2 is since piping resistance slightly depressurizes and is supplied to adsorption tower 1
It gives, but decompression amount is less, so unstrpped gas supply pressure is equivalent to the adsorption pressure of adsorption tower 1.
In addition, in the present embodiment, unstrpped gas supply pressure is adjusted between 650 ~ 900 (kPaG), detailed feelings
Condition is in rear explanation.
In the upper end side of four adsorption towers 1, the product gas discharge path 5 that product gas H is sent out is set, product is configured to
Gas H is accumulated in product gas tank 6 across the product gas discharge path 5.In addition, on the top of four adsorption towers 1, connection is useful
In the tower access 7 that four adsorption towers 1 are interconnected to connection.
Also, it is corresponding with each of four adsorption towers 1, it is provided with the product gas for being opened and closed product gas discharge path 5
Send out valve A2, B2, C2, D2 and the connection for being opened and closed tower access 7 interruption valve A4, B4, C4, D4.
Product gas discharge path 5 is provided with pressure-control valve 10, aforementioned pressure control valve 10 is used as adjustment by unstripped gas
Body G is functioned to the pressure adjustment unit for the unstrpped gas supply pressure that adsorption tower 1 supplies.
That is, the aperture by pressure-control valve 10 adjusts, limitation gas is flowed out from adsorption tower 1, the supply of above-mentioned raw materials gas
Pressure is changed adjustment, and the unstrpped gas supply pressure being adjusted as a result, is detected by pressure sensor 11.
In addition, in the present embodiment, the downstream side of the compressor 2 on road 3 being supplied in unstrpped gas, is provided with detection raw material
The feed side concentration sensor of the concentration namely for methane gas concentration (methane concentration in unstrpped gas) of the refined object gas of gas G
SG is provided with the concentration namely for methane gas concentration (production of the refined object gas of detection product gas H in product gas discharge path 5
Methane concentration in product gas) product side concentration sensor SH.
(operating of pressure swing adsorption formula gas manufacturing plants controls)
As shown in Fig. 2, being configured to, setting control pressure changes the operation control section F of the operating of absorption type gas manufacturing plants, fortune
Turn control unit F control unstrpped gas supply valves A1 ~ D1, product gas sends out valve A2 ~ D2, connection interruption valve A4 ~ D4 and exhaust gas row
Go out valve A5 ~ D5, thus four adsorption towers 1 carry out operation cycle shown in the table of Fig. 3 respectively.
That is, be configured to, each of four adsorption towers 1 will be determined under the mode of 16 steps being divided into operation cycle
Operating process is so that the different state of phase executes successively.
Operation cycle is illustrated as representative using the A towers of four adsorption towers 1.
In step 1 ~ 3, opens unstrpped gas supply valve A1 corresponding with A towers and product gas submitting valve A2 carry out is suitable
In raw material boosting, the absorption of absorption process.That is, adsorb impurity gas by adsorption piece while boosting is pressed in the inside of A towers,
Product gas H is discharged across product gas discharge path 5.Incidentally, in the absorption process, connection interruption valve A4 is closed
And exhaust exit valve A5.
In step 4, the connection for opening A towers and B towers is interrupted valve A4 and B4, is supplied into the internal gas for being about to A towers to B towers
Be equivalent to decompression with primary pressure process absorption press AB.Incidentally, it is closed in primary pressure process in the decompression
Unstrpped gas supply valve A1, product gas send out valve A2 and exhaust exit valve A5.
In addition, absorption pressure AB " AB " meaning mean by the internal gas for the on high-tension side A towers formerly recorded to
It is same as below in the B towers supply of the low-pressure side of rear record.
In steps of 5, it closes next standby with the associated all valves of A towers.
In step 6, the connection for opening A towers and C towers is interrupted valve A4 and C4, is supplied into the internal gas for being about to A towers to C towers
The pressure AC for being equivalent to the intermediate pressure process of decompression.Incidentally, in the decompression raw material is closed in intermediate pressure process
Air supply valve A1, product gas send out valve A2 and exhaust exit valve A5.
In step 7, the connection for opening A towers and D towers is interrupted valve A4 and D4, is supplied into the internal gas for being about to A towers to D towers
The pressure AD for being equivalent to the whole grade pressure process of decompression.Incidentally, in the decompression raw material is closed in whole grade pressure process
Air supply valve A1, product gas send out valve A2 and exhaust exit valve A5.
In step 8 ~ 10, the exhaust exit valve A5 of A towers is opened, carries out decompression corresponding with desorption step.Incidentally,
In the desorption step, unstrpped gas supply valve A1 is closed, product gas sends out valve A2 and connection interruption valve A4.
In a step 11, the connection for opening A towers and B towers is interrupted valve A4 and B4, is supplied into the internal gas for being about to B towers to A towers
That gives is equivalent to the pressure BA of the primary pressure process of boosting.Incidentally, it is closed former in primary pressure process in the boosting
Expect that air supply valve A1, product gas send out valve A2 and exhaust exit valve A5.
In step 12 and 13, it will be closed with the associated all valves of A towers next standby.
At step 14, the connection for opening A towers and C towers is interrupted valve A4 and C4, is supplied into the internal gas for being about to C towers to A towers
That gives is equivalent to the pressure CA of the intermediate pressure process of boosting.In the boosting in intermediate pressure process, closes unstrpped gas and supply
Valve A2 and exhaust exit valve A5 is sent out to valve A1, product gas.
In step 15, it will be closed with the associated all valves of A towers next standby.
In step 16, the connection for opening A towers and D towers is interrupted valve A4 and D4, is supplied into the internal gas for being about to D towers to A towers
The boosting that is equivalent to given presses DA with the absorption of whole grade pressure process.Incidentally, it is closed in whole grade pressure process in the boosting
Close unstrpped gas supply valve A1, product gas sends out valve A2 and exhaust exit valve A5.
That is, be configured to, operation control section F for four adsorption towers 1 each so that the state that phase is different, successively
It executes by absorption process, the primary pressure process of decompression, the intermediate pressure process of decompression, decompression whole grade pressure process, desorption
The operating week that process, the primary pressure process of boosting, the intermediate pressure process of boosting and boosting are constituted with whole grade pressure process
Phase.
In other words, be configured to, operation control section F for four adsorption towers 1 each so that the state that phase is different,
The operation cycle being made of with pressure process absorption process, decompression pressure process, desorption step, boosting is executed successively.
Also, as shown in the lower layer of Fig. 3, it is configured to, about each of step 1 ~ 16, as the step of executing each step
It time (second), determines X, t1, t2, t3, each process is accordingly executed with the determining step time.
Incidentally, the step time of step 1, step 5, step 9 and step 13 is to be equivalent to for that will execute absorption
The time of the adsorption time correction value X of the adsorption time change and adjustment of process is configured to as described later, when being adsorbed by correcting
Between correction value X, the adsorption time change and adjustment of absorption process will be executed.
(adjustment of adsorption time controls)
Operation control section F is configured to, based on the detection information of feed side concentration sensor SG, when by the absorption for carrying out absorption process
Between change and adjustment.
In the present embodiment, be configured to, by with the time of the time of step 1, step 5, the time of step 9 and step
13 time corresponding adsorption time correction value X increases and decreases adjustment together.
Incidentally, the time of step 1 is the time corresponding with the adsorption time of A towers, and the time of step 5 is inhaled with B towers
Attached time corresponding time, the time of step 9 is the time corresponding with the adsorption time of C towers, and the time of step 13 is and D towers
The adsorption time corresponding time.
In addition, in the lower layer of Fig. 3, an example of the setting time about step 1 ~ 16 is recorded.
For example, the adsorption time of A towers is by the adsorption time correction value X of step 1, the step time of step 2, step 3
It is the time that Step Time is added, right by the adsorption time change and adjustment of A towers by the adsorption time correction value X of amendment step 1
In the adsorption time of the adsorption time of B towers, the adsorption time of C towers, D towers be also identical.
In the present embodiment, by concentration of methane gas and process in the unstrpped gas of feed side concentration sensor SG detections
The relationship of correction value is determined in advance as outlined in the table of figure 4.
In addition, the process correction value about concentration of methane gas in the unstrpped gas not indicated in Fig. 4, passes through linear approximation
To find out.
Also, from operational order portion 12 to operation control section F instruction operation start instructions, change absorption type in initiation pressure
When the operating of gas manufacturing plants, start running as the initial value (such as 100 seconds) for presetting adsorption time correction value X,
Later, the absorption process carried out every time in each adsorption tower 1 all finds out being averaged for methane concentration in the unstrpped gas in the period
Value is the methane concentration in unstrpped gas that is averaged.
In addition, in average unstrpped gas methane concentration according to setting time (such as 500ms) by feed side concentration sensor
The detection information of SG samples, and the average value of the detected value as sampling is found out.
Then, using methane concentration in average unstrpped gas as methane concentration in unstrpped gas, the relationship based on Fig. 4 is found out
Process correction value, later, as shown in figure 5, being configured to, the process correction value that will be found out and current adsorption time correction value
The value that (initial value) X is added is set as the new adsorption time correction value X of next absorption process.
For example, executing the absorption by absorption process number y in the state that adsorption time correction value X is set as 100 (second)
When process, if methane concentration is 70 (%) in average unstrpped gas in the period, in next suction by absorption process number y+1
In attached process, " 100 (second) " that " 100 (second) " is added with process correction value " 0 (second) " is set as adsorption time correction value X.
In addition, when executing the absorption process by absorption process number y+1, if methane in average unstrpped gas in the period
A concentration of 65 (%), in then next absorption process by absorption process number y+2, by " 100 (second) " and process correction value " -5
" 95 (second) " that (second) " is added is set as adsorption time correction value X.
Then, for being also identical by the absorption process of absorption process number y+3 ~ y+6.
(adjustment of raw material supply pressure controls)
Operation control section F is configured to, based on the detection information of feed side concentration sensor SG, in order to by unstrpped gas supply pressure tune
It is made into the goal pressure accordingly determined with methane concentration in unstrpped gas, adjusts pressure-control valve 10.
Specifically, it is configured to, the aperture of operation control section F adjustment pressure-control valves 10 so that examined by pressure sensor 11
The unstrpped gas supply pressure of survey is goal pressure.
In addition, being configured to, as methane concentration in the unstrpped gas detected by feed side concentration sensor SG, uses and " inhale
Methane concentration in the average unstrpped gas found out as average value in the adjustment control of attached time ".That is, being configured to, execute every time
Absorption process all then sets the goal pressure of absorption process.
Goal pressure corresponding with methane concentration in unstrpped gas is found out by experiment.
That is, as shown in figure 11, about methane concentration in identical unstrpped gas, unstrpped gas supply pressure is made (to be equivalent to suction
Attached pressure) variation while find out the excellent unstrpped gas supply pressure (being equivalent to adsorption pressure) of methane recovery, by the unstrpped gas
Supply pressure is set to goal pressure.
For example, in the case that methane concentration is 90% in unstrpped gas, goal pressure is set to 650kPaG, in unstripped gas
In the case that methane concentration is 80% in body, goal pressure is set to 700kPaG, methane concentration is 70% in unstrpped gas
In the case of, goal pressure is set to 800kPaG etc., sets the goal pressure about methane concentration in unstrpped gas.
Incidentally, it is based on Figure 11, Ke Yishi, in the case that methane concentration is 65% in unstrpped gas, by goal pressure
It is set to 800kPaG, in the case of being 60%, goal pressure is set to 900kPaG, in the case of being 50%, by goal pressure
It is set to 850kPaG, but in the case that methane concentration is less than 70% in unstrpped gas, can also be set to by goal pressure
Implement under the form of 800kPaG.
I.e., it is possible to be, in the case that methane concentration is setting concentration (70%) or more in unstrpped gas, concentration is higher, more
So that goal pressure is reduced, in the case that methane concentration deficiency sets concentration (70%) in unstrpped gas, is maintained by goal pressure
Implement under the mode of steady state value (800kPaG).
In addition, goal pressure corresponding with methane concentration in unstrpped gas is preferably, find out about first in unstrpped gas
The goal pressure of multiple points of alkane concentration, but as shown in figure 11, the methane concentration in being found out about unstrpped gas by experiment
In the case of the goal pressure of multiple points, about methane concentration in the unstrpped gas for not finding out goal pressure, with reference to neighbouring original
The goal pressure for expecting methane concentration in gas, is found out using linear approximation etc..
(summary of the 1st embodiment)
According to the 1st embodiment, by " adjustment of adsorption time controls ", will accordingly be carried out with methane concentration in unstrpped gas
The adsorption time change and adjustment of absorption process, maintains aimed concn or more by methane concentration in product gas as a result, leads to simultaneously
" adjustment of raw material supply pressure controls " is crossed, with methane concentration in unstrpped gas accordingly by raw material supply pressure (being equivalent to adsorption pressure)
Change is adjusted, and thus, it is possible to improve methane recovery.
(the 2nd embodiment)
Then, illustrate the 2nd embodiment of pressure swing adsorption formula gas manufacturing plants, but the 2nd embodiment indicates above-mentioned
Another embodiment of " adjustment of adsorption time controls " of the 1st embodiment, basic scheme and above first embodiment phase
Together, so in the following description, the aspect different from above first embodiment is described in detail.
In above first embodiment, detection informations of the operation control section F based on feed side concentration sensor SG is instantiated
The case where by the adsorption time change and adjustment for carrying out absorption process, but in this 2nd embodiment, be configured to, it is based on product side
The detection information of concentration sensor SH is by adsorption time change and adjustment.
That is, as shown in the table of figure 6, predefining methane gas in the product gas detected by product side concentration sensor SH
The relationship of concentration and process correction value.
Also, it in the operation start of pressure swing adsorption formula gas manufacturing plants, is repaiied as adsorption time is preset
The initial value (such as 100 seconds) of positive value X starts running, and later, when each adsorption tower 1 carries out the period of absorption process, finds out
Methane concentration in the average value of methane concentration, that is, average product gas in product gas in the period.In addition, average product gas
Methane concentration samples the detection information of product side concentration sensor SH in each setting time (such as 500ms) in body, as
The average value of the detected value of sampling is found out.
Then, it is configured to, as shown in fig. 7, when terminating the absorption process in initial period, by first in average product gas
For alkane concentration as methane concentration in product gas, the relationship based on Fig. 6 finds out process correction value, the process amendment that will be found out
It is worth new adsorption time correction value of the value being added with current adsorption time correction value (initial value) X as next absorption process
X。
Later, it is configured to, when terminating the absorption process in second of later period, by methane concentration in average product gas
As methane concentration in product gas, the relationship based on Fig. 6 finds out process correction value, find out the process correction value that will find out and
The aggregate value that the process correction value found out at the end of the absorption process in pervious period is all added, the aggregate value and initial value
The value that (such as 100 seconds) are added is set as the new adsorption time correction value X of next absorption process.
For example, adsorption time correction value X is set as executing in the state of 100 (seconds) initial by absorption process number y's
When absorption process, if methane concentration is 95 (%) in average product gas, in next absorption work by absorption process number y+1
In sequence, " 100 (second) " that " 100 (second) " and the process correction value " 0 (second) " of initial value are added is set as adsorption time correction value
X。
Then, when terminating secondary absorption process, if methane concentration is 92 (%) in average product gas, next
In absorption process by absorption process number y+2, by the process correction value " 0 (second) " in initial period and secondary period
The aggregate value " -3 (second) " " 97 (second) " that is added with " 100 (second) " of initial value that is added of process correction value " -3 (second) " be set as
Adsorption time correction value X.Then, it is also identical about absorption process number y+3 ~ y+6 is passed through.
(summary of the 2nd embodiment)
In the 2nd embodiment, also by " adjustment of adsorption time controls ", accordingly will with methane concentration in product gas
The adsorption time change and adjustment of absorption process is carried out, methane concentration in product gas is maintained into aimed concn or more as a result, simultaneously
By " adjustment of raw material supply pressure controls ", accordingly with methane concentration in unstrpped gas, raw material supply pressure (is equivalent to absorption
Pressure) change adjusting, right side can improve methane recovery.
(the 3rd embodiment)
Then, illustrate that the 3rd embodiment of pressure swing adsorption formula gas manufacturing plants, the 3rd embodiment indicate the above-mentioned 1st
Another embodiment of " adjustment of adsorption time controls " of embodiment, basic scheme is identical as above first embodiment, institute
In the following description, the aspect different from above first embodiment is described in detail.
In the 3rd embodiment, detection information and product of the operation control section F based on feed side concentration sensor SG
The detection information of side concentration sensor SH will carry out the adsorption time change and adjustment of absorption process.
That is, as shown in the table of figure 8, predefining methane gas in the unstrpped gas by the SG detections of feed side concentration sensor
The relationship of concentration and process correction value is predefined and to be detected by product side concentration sensor SH in addition, as shown in the table of figure 9
The relationship of concentration of methane gas and process correction value in product gas.
Also, it in the operation start of pressure swing adsorption formula gas manufacturing plants, is repaiied as adsorption time is preset
The initial value (such as 100 seconds) of positive value X starts running.
Later, for the period for carrying out absorption process in each adsorption tower 1, methane in the unstrpped gas in the period is found out
The average value of concentration is that the average value of methane concentration in methane concentration and product gas in the period averagely in unstrpped gas is
Methane concentration in average product gas.
In addition, methane concentration is directed to setting time (such as 500ms) by feed side concentration sensor SG's in unstrpped gas
Detection information samples, and finds out the average value of the detected value of sampling, in the same manner, when methane concentration is for setting in average product gas
Between (such as 500ms) sample the detection information of product side concentration sensor SH, find out the average value of the detected value of sampling.
Then, using methane concentration in average unstrpped gas as methane concentration in unstrpped gas, the relationship based on Fig. 8 is asked
Go out with the relevant process correction values of unstrpped gas G, in the same manner, using methane concentration in average product gas as first in product gas
Alkane concentration, the relationship based on Fig. 9 are found out and the relevant process correction values of product gas H.
Also, as shown in Figure 10, it is configured to, by the suction of current adsorption time correction value (initial value) X and upper a cycle
The relevant process correction values of the corresponding unstrpped gas G of attached process, by product gas H corresponding with the absorption process of upper a cycle
Relevant process correction value and the relevant process correction value of the product gas found out at the end of the absorption process in period before
Aggregate value be added value be added, be set as the new adsorption time correction value X of next absorption process.
For example, adsorption time correction value X is set as executing in the state of 100 (seconds) initial by absorption process number y's
When absorption process, if methane concentration is 70 (%) in average unstrpped gas, methane concentration is 95 (%) in average product gas, then under
In one absorption process by absorption process number y+1, repaiied " 100 (second) " of initial value, with the relevant processes of unstrpped gas G
Positive value " 0 (second) ", " 100 (second) " being added with the relevant process correction values of product gas H " 0 (second) " are set as adsorption time amendment
Value X.
Then, at the end of second of absorption process, if methane concentration is 65 (%) in unstrpped gas, in average product gas
Methane concentration is 92 (%), then finds out and the relevant process correction values of unstrpped gas G " -5 (second) " and the relevant works of product gas H
Sequence correction value " -3 (second) ", in turn, upper one by absorption process number y absorption process with the relevant processes of product gas H
Correction value " 0 (second) " and the current absorption process by absorption process number y+1 with the relevant process amendments of product gas H
It is worth " -3 (second) " addition, finds out and the aggregate value of the relevant process correction values of product gas H " -3 (second) ".
Also, it will be " 100 (second) " of initial value and the relevant process correction values of unstrpped gas G " -5 (second) " and product
" 92 (second) " that the aggregate value " -3 (second) " of the relevant process correction values of gas H is added is set as adsorption time correction value X.
Then, also identical for period y+3 ~ y+6.
(summary of the 3rd embodiment)
In the 3rd embodiment, also by " adjustment of adsorption time controls ", with methane concentration in unstrpped gas and product gas
Methane concentration accordingly, will carry out the adsorption time change and adjustment of absorption process, as a result, by methane concentration in product gas in body
It is corresponding with methane concentration in unstrpped gas by " adjustment of raw material supply pressure controls " while maintaining aimed concn or more
Raw material supply pressure (being equivalent to adsorption pressure) is changed and is adjusted by ground, and thus, it is possible to improve methane recovery.
(other embodiment)
Then, other embodiment is enumerated.
(1) it in above-mentioned 1st ~ the 3rd embodiment, illustrates and the pressure sensor 11 for detecting unstrpped gas supply pressure is arranged
In unstrpped gas supply road 3 the case where but it is also possible to be with by pressure sensor 11 be set to each adsorption tower 1 each
The mode at the corresponding position of inlet portion of unstrpped gas G, the mode that pressure sensor 11 is set to product gas discharge path 5 are real
It applies.
(2) in above-mentioned 1st ~ the 3rd embodiment, instantiate unstrpped gas G be contain methane as refine object gas,
The case where containing the coal bed gas as impurity gas such as air, but for example can apply as unstrpped gas G and contain carbon dioxide
Deng biogas, by the gas of the modifications such as city gas, that is, contain hydrogen as refine object gas, contain carbon dioxide, one
The gas etc. of carbonoxide and nitrogen as impurity gas can be applied various gases as unstrpped gas G.
(3) in above-mentioned 1st ~ the 3rd embodiment, as pressure swing adsorption formula gas manufacturing plants, illustrate have
The device of four adsorption towers 1, but can also have 3 or 5 or more adsorption towers 1, in each of these adsorption towers 1, with
Make the state that phase is different, executes absorption process, decompression pressure process, desorption step, boosting pressure process successively.
(4) in above-mentioned 1st ~ the 3rd embodiment, the lower end side instantiated in the one end as adsorption tower 1 connects original
Expect gas supply road 3 and exhaust gas discharge path 4 and connects product gas discharge path in the upper end side of the another side as adsorption tower 1
5 mode on the upper end side connection unstrpped gas supply road 3 of the one end as adsorption tower 1 and exhaust gas but it is also possible to be to arrange
Outlet 4 and implement in the mode of the lower end side of the another side as adsorption tower 1 connection product gas discharge path 5.
(5) in above-mentioned 1st ~ the 3rd embodiment, make the exhaust gas being discharged from adsorption tower 1 in desorption step be accumulated in be in
The gas tank T of the internal pressure of atmospheric level, but for example can also, make the internal pressure of gas tank T compared with atmospheric pressure by vacuum pump
Decompression etc. aspirates exhaust gas by the pressure forced down than air.
In addition, the above embodiment (including other embodiment, same as below) as long as disclosed in structure do not generate lance
Shield, it will be able to structure combination application disclosed in other embodiment, in addition, disclosed embodiment is in the present specification
It illustrates, the implementation of the present invention is not limited to this, can suitably change in the range of not departing from the purpose of the present invention.
Reference sign
1 adsorption tower
3 unstrpped gases supply road
4 exhaust gas discharge paths
5 product gas discharge paths
10 pressure adjustment units
G unstrpped gases
H product gas.
Claims (3)
1. a kind of pressure swing adsorption formula gas manufacturing plants, aforementioned pressure changes absorption type gas manufacturing plants for multiple suctions
Each of attached tower, be provided with make phase differently successively carry out operation cycle operation control section, aforesaid plurality of adsorption tower with
It fills from the adsorption piece of the unstrpped gas of impurity gas containing refined object gas and its in addition absorption abovementioned dopant gases
Mode and so that unstrpped gas supply road and exhaust gas discharge path connect with one end and make product gas discharge path and the other end
The mode of side connection is arranged, and aforementioned operation cycle includes absorption process and desorption step, and preceding adsorption process is from across aforementioned original
The aforementioned raw material gas absorption abovementioned dopant gases of material gas supply road supply come product across before-mentioned products gas discharge path
Gas is discharged, and abovementioned dopant gases are discharged aforementioned desorption step across aforementioned exhaust gas discharge path, which is characterized in that
Be provided with pressure adjustment unit and raw gas concentration test section, the adjustment of aforementioned pressure adjustment section in preceding adsorption process to
Preceding adsorption tower supplies the unstrpped gas supply pressure of aforementioned raw material gas, and aforementioned raw material gas concentration test section detects aforementioned raw material
The concentration of the aforementioned refined object gas of gas,
Detection information of the aforementioned operation control section based on aforementioned raw material gas concentration test section, in order to supply aforementioned raw material gas
Pressure is adjusted to the goal pressure accordingly determined with the concentration of the aforementioned refined object gas of aforementioned raw material gas, adjusts aforementioned pressure
Power adjustment section.
2. pressure swing adsorption formula gas manufacturing plants as described in claim 1, which is characterized in that
The concentration of aforementioned refined object gas of the aforementioned operation control section based on aforementioned raw material gas and from aforementioned adsorption tower be discharged
Aforementioned refined object gas concentration at least one party, will carry out preceding adsorption process adsorption time change and adjustment.
3. pressure swing adsorption formula gas manufacturing plants as claimed in claim 2, which is characterized in that
Aforementioned raw material gas is passed through aforementioned containing 50% or more the gas containing methane as the methane of before-mentioned products gas
The before-mentioned products gas of product gas discharge path discharge is the product gas containing 80% or more methane.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016072350A JP2017177066A (en) | 2016-03-31 | 2016-03-31 | Pressure fluctuation adsorption-type gas production apparatus |
| JP2016-072350 | 2016-03-31 | ||
| PCT/JP2017/013532 WO2017170983A1 (en) | 2016-03-31 | 2017-03-31 | Pressure swing adsorption type gas manufacturing device |
Publications (1)
| Publication Number | Publication Date |
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| CN108778466A true CN108778466A (en) | 2018-11-09 |
Family
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| JP (1) | JP2017177066A (en) |
| CN (1) | CN108778466A (en) |
| AU (1) | AU2017245115A1 (en) |
| PL (1) | PL427936A1 (en) |
| WO (1) | WO2017170983A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113614026A (en) * | 2019-03-27 | 2021-11-05 | 大阪瓦斯株式会社 | Method for operating hydrogen production apparatus and hydrogen production apparatus |
| CN115646132A (en) * | 2022-12-14 | 2023-01-31 | 南通亚泰工程技术有限公司 | Self-adaptive control method and inert gas system controller based on same |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109266415A (en) * | 2018-11-13 | 2019-01-25 | 安徽理工大学 | A kind of datonation-inhibition formula pressure-swing adsorption concentration of low concentration gas at natural gas simulator |
| FR3111281B1 (en) | 2020-06-10 | 2022-08-05 | Air Liquide | Method for managing a pressure modulation adsorption gas treatment unit |
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- 2017-03-31 AU AU2017245115A patent/AU2017245115A1/en not_active Abandoned
- 2017-03-31 PL PL427936A patent/PL427936A1/en unknown
- 2017-03-31 CN CN201780020689.6A patent/CN108778466A/en active Pending
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2017177066A (en) | 2017-10-05 |
| AU2017245115A2 (en) | 2018-11-29 |
| PL427936A1 (en) | 2019-04-23 |
| AU2017245115A1 (en) | 2018-11-22 |
| WO2017170983A1 (en) | 2017-10-05 |
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