CN1298410C - Pressure varying adsorption with two downflow releasing tanks - Google Patents

Pressure varying adsorption with two downflow releasing tanks Download PDF

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CN1298410C
CN1298410C CNB200510020305XA CN200510020305A CN1298410C CN 1298410 C CN1298410 C CN 1298410C CN B200510020305X A CNB200510020305X A CN B200510020305XA CN 200510020305 A CN200510020305 A CN 200510020305A CN 1298410 C CN1298410 C CN 1298410C
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adsorption tower
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CN1680003A (en
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李克兵
殷文华
张�杰
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Southwest Research and Desigin Institute of Chemical Industry
Haohua Chemical Science and Technology Corp Ltd
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Sichuan Tianyi Science and Technology Co Ltd
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Abstract

The present invention relates to a pressure varying adsorption process with two forward tanks, which is characterized in that an adsorption tower of a pressure varying adsorption device is divided into two series respectively provided with a forward tanks for storing forward gas for regenerating the adsorption tower. A forward and washing loop of each series is provided with a sequence valve and a regulating valve. The pressure varying adsorption device adopts a normal-pressure washing regeneration process.

Description

Pressure swing adsorption technique with two downflow releasing tanks
Technical field:
The present invention and pressure swing absorption process, especially relevant with the big pressure swing absorption process of product gas output.
Background technology:
Development along with the pressure-swing absorption apparatus maximization, the development of particularly super-huge in recent years (hydrogen output is greater than 100,000 Nm3/h) PSA device, guaranteeing under the product quality premise, the user is to product yield, investment and take up an area of more and more harshness of requirement, add the adsorption tower volume too conference have a strong impact on the distribution of air-flow in bed and flow, traditional PSA technology can't adapt to the requirement of large scale development.
Below with the development of 10 tower process comparative illustration PSA technologies:
Released 10-3-3 technology abroad at the beginning of the eighties, i.e. 10 adsorption towers, the charging simultaneously of 3 towers, 3 equal compression technologies, 30 seconds is 1 step.This technology is mainly used in the middle change gas purifying hydrogen of hydrogen technology under the 2.5MPa pressure.This technology time-scale sees Table 1.
Table 1:PSA device 10-3-3 technology time-scale
Divide the cycle 1 2 3 4 5 6 7 8 9 10
Step 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Time s 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30
T0101 A A A A A A E1D E2D E3D PP PP PP D P P P E3R E2R E1R FR
T0102 E1R FR A A A A A A E1D E2D E3D PP PP PP D P P P E3R E2R
T0103 E3R E2R E1R FR A A A A A A E1D E2D E3D PP PP PP D P P P
T0104 P P E3R E2R E1R FR A A A A A A E1D E2D E3D PP PP PP D P
T0105 D P P P E3R E2R E1R FR A A A A A A E1D E2D E3D PP PP PP
T0106 PP PP D P P P E3R E2R E1R FR A A A A A A E1D E2D E3D PP
T0107 E3D PP PP PP D P P P E3R E2R E1R FR A A A A A A E1D E2D
T0108 E1D E2D E3D PP PP PP D P P P E3R E2R E1R FR A A A A A A
T0109 A A E1D E2D E3D PP PP PP D P P P E3R E2R E1R FR A A A A
T01010 A A A A E1D E2D E3D PP PP PP D P P P E3R E2R E1R FR A A
From time-scale as can be known, every adsorption tower experience absorption (A) successively in a cycle period, isostasy fall (E1D), secondary pressure equilibrium fall (E2D), three isostasies (E3D) falls, along putting (PP), contraryly putting that (D), flushing (P), three isostasy liters (E3R), secondary pressure balancedly rise (E2R), an isostasy liter (E1R), (FR) finally boosts.Absorption accounts for 6 steps, accounts for 3 steps along putting (PP), and flushing (P) accounts for 3 steps.All the other adsorption towers also experience same process, just stagger mutually on the time.
This technology absorption (A) total time is 180 seconds, and flushing (P) time is 90 seconds, handles 40 ℃, and the unstripped gas under the 2.5MPa pressure can only be realized at most all pressing for 3 times, so the yield of product hydrogen is lower, and the highest yield is 85%.
Released follow-on 10-3-3 technology abroad in 80 mid-terms, main improvement: will shorten to 2 steps along (PP) time that puts, will wash (P) time lengthening is 4 steps.10-3-3 technology time-scale after the improvement sees Table 2.
Table 2: the 10-3-3 technology time-scale after the improvement
Divide the cycle 1 2 3 4 5 6 7 8 9 10
Step 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Time s 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30
T0101 A A A A A A E1D E2D E3D PP PP D P P P P E3R E2R E1R FR
T0102 E1R FR A A A A A A E1D E2D E3D PP PP D P P P P E3R E2R
T0103 E3R E2R E1R FR A A A A A A E1D E2D E3D PP PP D P P P P
T0104 P P E3R E2R E1R FR A A A A A A E1D E2D E3D PP PP D P P
T0105 P P P P E3R E2R E1R FR A A A A A A E1D E2D E3D PP PP D
T0106 PP D P P P P E3R E2R E1R FR A A A A A A E1D E2D E3D PP
T0107 E3D PP PP D P P P P E3R E2R E1R FR A A A A A A E1D E2D
T0108 E1D E2D E3D PP PP D P P P P E3R E2R E1R FR A A A A A A
T0109 A A E1D E2D E3D PP PP D P P P P E3R E2R E1R FR A A A A
T01010 A A A A E1D E2D E3D PP PP D P P P P E3R E2R E1R FR A A
Owing to do not increase tankage, a certain tower of this technology be used for the flushing (P) of two adsorption towers of waiting to regenerate simultaneously along putting (PP) gas, for example: first step of T0101 adsorption tower is used for the flushing (P) of T0108 and T0109 adsorption tower simultaneously along venting (PP); Second step of T0101 adsorption tower is used for the flushing (P) of T0109 and T01010 adsorption tower simultaneously along venting (PP).For the flushing air-flow that guarantees 2 adsorption towers to be washed even, along putting and flush loop must adopt the controllability sequencing valve 10 altogether.Owing to the adjusting function of every controllability sequencing valve difference occurs along with the variation of installation site and running time, the purge gas mass flow discrepancy that causes entering two towers is even, even serious bias current, causes regeneration effect to worsen.
This technology absorption (A) total time is 180 seconds, and flushing (P) time is 120 seconds, and the middle change gas of handling under the 2.5MPa pressure can only be realized at most all pressing for 3 times, so the yield of product hydrogen is still not high, and the highest yield is 85.5%.
The domestic 10-3-4 technology of having released in the nineties, main improvement: change 4 times into and all press with all pressing for 3 times; To change 2 steps into by 3 steps along putting (PP) time; (P) time of will washing changes 2 steps into by 3 steps.Per step setting-up time is 45 seconds.10-3-4 technology time-scale sees Table 3.
Table 3:10-3-4 technology time-scale
Divide the cycle 1 2 3 4 5 6 7 8 9 10
Time s 45 45 45 45 45 45 45 45 45 45 45 45 45 45 45 45 45 45 45 45
Step 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
T0101 A A A A A A E1D E2D E3D E4D PP1 PP2 D P2 P1 E4R E3R E2R E1R FR
T0102 E1R FR A A A A A A E1D E2D E3D E4D PP1 PP2 D P2 P1 E4R E3R E2R
T0103 E3R E2R E1R FR A A A A A A E1D E2D E3D E4D PP1 PP2 D P2 P1 E4R
T0104 P1 E4R E3R E2R E1R FR A A A A A A E1D E2D E3D E4D PP1 PP2 D P2
T0105 D P2 P1 E4R E3R E2R E1R FR A A A A A A E1D E2D E3D E4D PP1 PP2
T0106 PP1 PP2 D P2 P1 E4R E3R E2R E1R FR A A A A A A E1D E2D E3D E4D
T0107 E3D E4D PP1 PP2 D P2 P1 E4R E3R E2R E1R FR A A A A A A E1D E2D
T0108 E1D E2D E3D E4D PP1 PP2 D P2 P1 E4R E3R E2R E1R FR A A A A A A
T0109 A A E1D E2D E3D E4D PP1 PP2 D P2 P1 E4R E3R E2R E1R FR A A A A
T01010 A A A A E1D E2D E3D E4D PP1 PP2 D P2 P1 E4R E3R E2R E1R FR A A
From time-scale as can be known, every adsorption tower experience absorption (A) successively in a cycle period, isostasy fall (E1D), secondary pressure equilibrium fall (E2D), three isostasies fall (E3D), four isostasies fall (E4D), along put 1 (PP1), along putting 2 (PP2), contraryly putting that (D), flushing (P2) 1, flushing 2 (P1), four isostasy liters (E4R), three isostasy liters (E3R), secondary pressure balancedly rise (E2R), an isostasy liter (E1R), (FR) finally boosts.All the other adsorption towers also experience same process, just stagger mutually on the time.
The great advantage of this technology is that the adsorption tower of same quantity has been realized all pressing for 4 times.And adopt twice along putting the realization turn interleaving flushing, be that high suitable 2 (PP2) of putting of impurity content are used for just finishing contrary many relatively adsorption tower flushing 2 (P2) of (D) step impurity content of putting, what impurity content was low is used for finishing the few relatively adsorption tower flushing (P1) of flushing 2 (P2) impurity content along putting 1 (PP1), makes adsorbent reactivation more thorough.Help improving the product hydrogen yield.
This technology absorption (A) total time is 270 seconds, and flushing (P) time is 90 seconds, can realize all pressing for 4 times, realizes that along putting turn interleaving flushing makes adsorbent reactivation more thorough with two steps.Handle 40 ℃, the unstripped gas under the 2.5MPa pressure, the yield of product hydrogen reaches 90%.Improved 4% product recovery rate than 10-3-3 technology, for super-huge (hydrogen output is greater than 100,000 Nm3/h), annual several ten million yuan of the profits that increase.
But the disadvantage of this technology is: guarantee the flushing recovery time more than 90 seconds, minimum 270 seconds of (A) total time of absorption.Manyed (A) total time 95 seconds than aforesaid 10-3-3 technology absorption.This just means that the consumption of adsorption tower volume and adsorbent increases more than 1/3rd, and investment and floor space increase greatly.
Summary of the invention:
The purpose of this invention is to provide a kind of small investment, take up an area of fewly, the product recovery rate height is convenient to the pressure swing absorption process with two downflow releasing tanks of on-line maintenance.
The present invention realizes like this:
The pressure swing absorption process of two downflow releasing tanks of band of the present invention, the adsorption tower of pressure-swing absorption apparatus is divided into two series, downflow releasing tank of each array configuration is used to store the suitable venting for adsorption tower regeneration usefulness, each series along put and flush loop on configuration sequencing valve and control valve, the rinsing step of this pressure-swing absorption apparatus is the normal pressure flushing.
The feed end of the adsorption tower that each is serial connects the unstripped gas input pipe by sequencing valve, the product end is by the sequencing valve product gas efferent duct of practicing midwifery, the product end of the adsorption tower that each is serial publicly connects the outlet of this serial downflow releasing tank along putting back to inlet that the road connects this serial downflow releasing tank by one by a public flush loop, each adsorption tower is respectively put back to road and flush loop by a sequencing valve smoothness, and the outlet of each downflow releasing tank connects this serial flush loop by a control valve.
Each serial downflow releasing tank connects another serial flush loop by another control valve.
Being connected by a hand stop valve respectively with flush loop of two series along putting back to the road.
Pressure-swing absorption apparatus is the continuous movement system that the adsorption tower more than 8 and 8 is formed, the experience absorption (A) successively in circulation once of each adsorption tower, at least once all pressure drops (E1D, E2D, E3D, E4D, ), step along put (PP), reverse put pressures (D), a plurality of step flushing (P), at least once equal voltage rise (..., E4R, E3R, E2R, E1R) and the processing steps such as (FR) that finally boosts.
The pressure of transformation adsorption step is 0.8～5.0MPa (G), and the pressure of rinsing step is 0.01～0.1MPa (G), and operating temperature is 10-45 ℃.
In order to reduce investment, and do not influence operating characteristics, the invention provides a kind of pressure swing absorption process with two downflow releasing tanks, the adsorption tower of PSA device is divided into two series, downflow releasing tank of each array configuration be used to store for adsorption tower regeneration usefulness along venting, and each series along put and flush loop on corresponding sequencing valve of configuration and regulating valve system.
Pressure swing absorption process of the present invention is compared with traditional handicraft, shortens suitable putting the time greatly under the prerequisite that guarantees the same recovery time, thereby has following advantage:
1. can shorten adsorption time greatly, reduce the total amount of the volume and the adsorbent of adsorption tower, thereby reduce investment outlay greatly;
2. the adsorption tower that can realize two series washes respectively or turn interleaving flushing, has better regeneration effect, thereby improves the product recovery rate of device;
3. the program under any fault that can realize is switched and on-line maintenance, thereby guarantees PSA device long-period stable operation.
The present invention is specially adapted to large-scale transformation absorption purifying hydrogen of hydrogen.
Description of drawings:
Fig. 1 is a process chart of the present invention.
Fig. 2 is an another process chart of the present invention.
The specific embodiment:
Technology of the present invention is formed a continuous movement system by 8 adsorbent beds at least, according to arts demand the adsorption tower of PSA device is divided into two series, downflow releasing tank of each array configuration be used to store for adsorption tower regeneration usefulness along venting, and each series along put and flush loop on corresponding sequencing valve of configuration and regulating valve system.Each adsorbent bed experiences following processing step in a cycle period:
(1) absorption (A): 0.8～5.0MPa unstripped gas enters adsorption tower from the adsorption tower bottom through raw material pipeline and sequencing valve, the impurity composition of the strong adsorptivity in the raw material is adsorbed the adsorbents adsorb in the tower, the product component of weak adsorptivity passes adsorbent and discharge and send the battery limit (BL) from adsorption tower top behind pipeline and sequencing valve, when impurity reaches normal concentration in Purge gas, close raw material and product sequencing valve, stop the charging of unstripped gas, stop absorption;
(2) all pressure drops (ED): after absorption (A) step, open the equalizing valve door, with the adsorption tower transmission of the product component in the dead space in the tower and heat of adsorption to equal voltage rise.After all the pressure with this equal pressure drop adsorption tower of voltage rise equates, close the equalizing valve door.According to the disposal ability of adsorptive pressure, adsorbent, the situation of bed number, all pressure drop can be finished one or more times, can abbreviate as successively E1D, E2D, E3D, E4D,
(3) along putting (PP): after finishing equal pressure drop, the product component of some weak adsorptivity in the adsorption tower, open respectively single bi serie adsorption tower along putting sequencing valve, make to enter downflow releasing tank fast along venting.A gas part that enters in the downflow releasing tank is evenly washed this serial adsorption tower after a mediation valve voltage stabilizing of downflow releasing tank outlet, another part stores and is used for the slowly evenly flushing of other rinsing step, to improve regeneration effect.Also can utilize jar two control valves of the mediation valve of outlet, realize the turn interleaving flushing of two serial adsorption towers.
(4) the reverse pressure (D) of putting: gas still residual in the adsorbent bed is then drained by the feed end of bed along putting after (PP) step finishes above-mentioned, reversely puts that to press final pressure be 0.02～0.05MPa (G);
(5) flushing (P): adsorbent reactivation gets more thorough in the bed in order to make, adopt the normal pressure process of washing, the gas of downflow releasing tank washes this bed to utilize PP step adsorbent bed to arrange into, further reduce the reverse dividing potential drop of impurity in this bed of putting after pressure (D) step, remaining impurity is drained from the feed end of bed, and flushing process makes bed layer pressure reduce to 0.02～0.05MPa (G);
(6) all voltage rises (ER): this step, the gas that promptly utilizes equal pressure drop (ED) step adsorbent bed to discharge entered the adsorbent bed that finishes the P step, and its pressure is raise gradually with all pressure drop (ED) step is corresponding.This step can be finished one or more times, can abbreviate as successively ..., E4R, E3R, E2R, E1R;
(7) (FR) finally boosts: because the E1R step can't make adsorbent bed pressure reach adsorptive pressure, therefore need the part of the product gas exported with the adsorbent bed that is in the A step this adsorbent bed to be boosted from the product end, also useful raw materials gas boosts to this adsorbent bed or product gas and unstripped gas finally boost to adsorbent bed simultaneously from the bed feed end, until reaching adsorptive pressure.
Each adsorbent bed all experiences identical step, just intersects mutually on the sequential, carries out continuously to guarantee separation process.
With example in detail content of the present invention is described in detail below:
Example 1:
10-3-4 technology.
10-3-4 technology time-scale 4 utilizes the unstripped gas under this PROCESS FOR TREATMENT 2.5MPa pressure.
Table 4:10-3-4 technology time-scale
Divide the cycle 1 2 3 4 5 6 7 8 9 10
Step 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Time s 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30
T0101-1 A A A A A A E1D E2D E3D E4D PP D P P P E4R E3R E2R E1R FR
T0101-2 E1R FR A A A A A A E1D E2D E3D E4D PP D P P P E4R E3R E2R
T0101-3 E3R E2R E1R FR A A A A A A E1D E2D E3D E4D PP D P P P E4R
T0101-4 P E4R E3R E2R E1R FR A A A A A A E1D E2D E3D E4D PP D P P
T0101-5 P P P E4R E3R E2R E1R FR A A A A A A E1D E2D E3D E4D PP D
T0101-6 PP D P P P E4R E3R E2R E1R FR A A A A A A E1D E2D E3D E4D
T0101-7 E3D E4D PP D P P P E4R E3R E2R E1R FR A A A A A A E1D E2D
T0101-8 E1D E2D E3D E4D PP D P P P E4R E3R E2R E1R FR A A A A A A
T0101-9 A A E1D E2D E3D E4D PP D P P P E4R E3R E2R E1R FR A A A A
T0101-10 A A A A E1D E2D E3D E4D PP D P P P E4R E3R E2R E1R FR A A
From time-scale as can be known, every adsorption tower experience absorption (A) successively in a cycle period, isostasy fall (E1D), secondary pressure equilibrium fall (E2D), three isostasies fall (E3D), four isostasies fall (E4D), 1 step along put (PP), contrary putting washes in (D), 3 steps that (P), four isostasy liters (E4R), three isostasy liters (E3R), secondary pressure balancedly rise (E2R), an isostasy liter (E1R), (FR) finally boosts.All the other adsorption towers also experience same process, just stagger mutually on the time.
From this time-scale as can be known, owing to only adopted a step along putting (PP), have only 30 seconds along letting slip the journey time, shortened greatly along putting the time than traditional handicraft, can reduce greatly along the impurity content that discharges because of the step-down diffusion in the venting along letting slip journey fast, thus the rate of recovery of raising product.Utilize two suitable venting jars that disposed, this technology has realized all pressing for 4 times, and increases (P) time of flushing, under the flushing recovery time prerequisite that guarantees more than 90 seconds, adsorbs and (A) total time also has only 180 seconds, compares with the traditional PSA device, and investment reduces greatly.
This PSA device T0101-1, T0101-3, T0101-5, T0101-7, T0101-9 adsorption tower are formed a series of, and T0101-2, T0101-4, T0101-6, T0101-8, T0101-10 form another series; Dispose one respectively along venting surge tank V0101, V0102 two series, dispose sequencing valve KV-A, a KV-B on the road respectively along putting back between two serial adsorption towers and the downflow releasing tank, on the flush loop between each downflow releasing tank outlet and the adsorption tower, dispose control valve FV-A, a FV-B respectively; Disposed the hand stop valve door on the pipeline between two serial adsorption towers and the downflow releasing tank, accompanying drawing 1 is seen in technological process.A certain control element on certain serial adsorption tower (containing magnetic valve, sequencing valve and control valve) breaks down, and can excise out of order a series ofly, and another series continues operation, really realizes the fault element on-line maintenance.
Suitable venting the along putting (PP) step of each adsorption tower put sequencing valve and entered downflow releasing tank V0101, V0102 respectively along the sequencing valve KV-A, the KV-B that put back on the road through the suitable of this tower.Enter gas even other adsorption tower of this series of flushing after the mediation valve FV-A of downflow releasing tank outlet, FV-B voltage stabilizing respectively among downflow releasing tank V0101, the V0102, can realize that like this two serial adsorption towers wash the technology of regeneration respectively; This example hydrogen yield reaches 90%.
Example 2:
10-3-4 technology.
10-3-4 technology time-scale 4 utilizes the unstripped gas under this PROCESS FOR TREATMENT 2.5MPa pressure.
Table 4:10-3-4 technology time-scale
Divide the cycle 1 2 3 4 5 6 7 8 9 10
Step 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Time s 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30
T0101-1 A A A A A A E1D E2D E3D E4D PP D P P P E4R E3R E2R E1R FR
T0101-2 E1R FR A A A A A A E1D E2D E3D E4D PP D P P P E4R E3R E2R
T0101-3 E3R E2R E1R FR A A A A A A E1D E2D E3D E4D PP D P P P E4R
T0101-4 P E4R E3R E2R E1R FR A A A A A A E1D E2D E3D E4D PP D P P
T0101-5 P P P E4R E3R E2R E1R FR A A A A A A E1D E2D E3D E4D PP D
T0101-6 PP D P P P E4R E3R E2R E1R FR A A A A A A E1D E2D E3D E4D
T0101-7 E3D E4D PP D P P P E4R E3R E2R E1R FR A A A A A A E1D E2D
T0101-8 E1D E2D E3D E4D PP D P P P E4R E3R E2R E1R FR A A A A A A
T0101-9 A A E1D E2D E3D E4D PP D P P P E4R E3R E2R E1R FR A A A A
T0101-10 A A A A E1D E2D E3D E4D PP D P P P E4R E3R E2R E1R FR A A
From time-scale as can be known, every adsorption tower experience absorption (A) successively in a cycle period, isostasy are fallen (E1D), secondary pressure equilibrium and are fallen (E2D), three isostasies and fall (E3D), four isostasies and fall (E4D), 1 step along putting (PP), contraryly putting that (D), 3 step flushings (P), four isostasy liters (E4R), three isostasy liters (E3R), secondary pressure balancedly rise (E2R), an isostasy liter (E1R), (FR) finally boosts.All the other adsorption towers also experience same process, just stagger mutually on the time.
From this time-scale as can be known, owing to only adopted a step along putting (PP), have only 30 seconds along letting slip the journey time, shortened greatly along putting the time than traditional handicraft, can greatly reduce the impurity content that discharges because of the step-down diffusion along in the venting along letting slip journey fast, thereby improve the rate of recovery of product.Utilize two suitable venting jars being set up, this technology has realized all pressing and 3 step flushings (P) for 4 times, and under the flushing recovery time prerequisite of assurance more than 90 seconds, absorption also has only 180 seconds (A) total time, compares with the traditional PSA device, invests greatly and reduces.And hydrogen yield reaches 90%.This PSA device T0101-1, T0101-3, T0101-5, T0101-7, T0101-9 adsorption tower are formed a series of, and T0101-2, T0101-4, T0101-6, T0101-8, T0101-10 form another series; Two series dispose sequencing valve KV-A, a KV-B respectively along putting back on the road along venting surge tank V0101, V0102 to dispose one respectively two series, dispose two control valve FV-A1, FV-A2 and FV-B1, FV-B2 respectively in each downflow releasing tank outlet; Disposed the hand stop valve door on the pipeline between two serial adsorption towers and the downflow releasing tank, accompanying drawing 2 is seen in technological process.A certain control element on certain serial adsorption tower (containing magnetic valve, sequencing valve and control valve) breaks down, and can excise out of order a series ofly, and another series continues operation, really realizes the fault element on-line maintenance.
Each adsorption tower along put (PP) step early stage along venting through this tower along put sequencing valve and along put back to sequencing valve KV-A on the road enter this series downflow releasing tank V0101, along put (PP) step later stage along venting through this tower along putting sequencing valve and entering this series downflow releasing tank V0102 along the sequencing valve KV-B that puts back on the road; Or along put (PP) step early stage along venting through this tower along put sequencing valve and along put back to sequencing valve KV-B on the road enter this series downflow releasing tank V0102, along put (PP) step later stage along venting through this tower along putting sequencing valve and entering this series downflow releasing tank V0101 along the sequencing valve KV-A that puts back on the road, enter gas evenly this series of flushing and another serial adsorption tower after mediation valve FV-A1, the FV-A2 of downflow releasing tank outlet and FV-B1, FV-B2 voltage stabilizing respectively among downflow releasing tank V0101, the V0102, can realize the technology that two serial adsorption tower turn interleaving flushings are regenerated like this; This example hydrogen yield reaches 90.5%.
Example 3:
8-2-3 technology
10-3-4 technology time-scale 5 utilizes 40 ℃ of this PROCESS FOR TREATMENT, the unstripped gas under the 2.0MPa pressure.
Table 5:8-2-3 technology time-scale
Divide the cycle 1 2 3 4 5 6 7 8
Time s 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30
Step 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
T0101 A A A A E1D E2D E3D PP D P P P E3R E2R E1R FR
T0102 E1R FR A A A A E1D E2D E3D PP D P P P E3R E2R
T0103 E3R E2R E1R FR A A A A E1D E2D E3D PP D P P P
T0104 P P E3R E2R E1R FR A A A A E1D E2D E3D PP D P
T0105 D P P P E3R E2R E1R FR A A A A E1D E2D E3D PP
T0106 E3D PP D P P P E3R E2R E1R FR A A A A E1D E2D
T0107 E1D E2D E3D PP D P P P E3R E2R E1R FR A A A A
T0108 A A E1D E2D E3D PP D P P P E3R E2R E1R FR A A
Wherein T0101-1, T0101-3, T0101-5, T0101-7 adsorption tower are formed a series ofly, T0101-2, T0101-4, T0101-6, T0101-8, form another series; Dispose one respectively along the venting surge tank two series, each series is along putting back to sequencing valve of configuration on the road, at downflow releasing tank outlet configuration one or two control valves.
From time-scale as can be known, every adsorption tower experience absorption (A) successively in a cycle period, isostasy are fallen (E1D), secondary pressure equilibrium and are fallen (E2D), three isostasies and fall (E3D), 1 step along putting (PP), contraryly putting that (D), 3 step flushings (P), three isostasy liters (E 3R), secondary pressure balancedly rise (E2R), an isostasy liter (E1R), (FR) finally boosts.All the other adsorption towers also experience same process, just stagger mutually on the time.
This technology can realize that also two series wash respectively or turn interleaving flushing, and under the flushing recovery time prerequisite that guarantees more than 90 seconds, absorption has only 120 seconds (A) total time, compares with the traditional PSA device, and investment reduces greatly, and hydrogen yield reaches 86%.
Example 4:
12-3-6 technology
10-3-4 technology time-scale 6 utilizes 40 ℃ of this PROCESS FOR TREATMENT, the unstripped gas under the 3.2MPa pressure.
Table 6:12-3-6 technology time-scale
Divide the cycle 1 2 3 4 8 9 10 11 12
Time s 30 30 30 30 30 30 30 30 30 5 6 7 30 30 30 30 30 30
T0101 A A A A A A E1D E2D E3D E4D E5D E6D PP D P 30 30 30 30 30 30 E2R E1R FR
T0102 E1R FR A A A A A A E1D E2D E3D E4D E5D E6D PP D P P P E6R E5R E4R E3R E2R
T0103 E3R E2R E1R FR A A A A A A E1D E2D E3D E4D E5D E6D PP D P P P E6R E5R E4R
T0104 E5R E4R E3R E2R E1R FR A A A A A A E1D E2D E3D E4D E5D E6D PP D P P P E6R
T0105 P E6R E5R E4R E3R E2R E1R FR A A A A A A E1D E2D E3D E4D E5D E6D PP D P P
T0106 P P P E6R E5R E4R E3R E2R E1R FR A A A A A A E1D E2D E3D E4D E5D E6D PP D
T0107 PP D P P P E6R E5R E4R E3R E2R E1R FR A A A A A A E1D E2D E3D E4D E5D E6D
T0108 E5D E6D PP D P P P E6R E5R E4R E3R E2R E1R FR A A A A A A E1D E2D E3D E4D
T0109 E3D E4D E5D E6D PP D P P P E6R E5R E4R E3R E2R E1R FR A A A A A A E1D E2D
T01010 E1D E2D E3D E4D E5D E6D PP D P P P E6R E5R E4R E3R E2R E1R FR A A A A A A
T01011 A A E1D E2D E3D E4D E5D E6D PP D P P P E6R E5R E4R E3R E2R E1R FR A A A A
T01012 A A A A E1D E2D E3D E4D E5D E6D PP D P P P E6R E5R E4R E3R E2R E1R FR A A
Wherein T0101-1, T0101-3, T0101-5, T0101-7, T0101-9, T0101-11 adsorption tower are formed a series ofly, and T0101-2, T0101-4, T0101-6, T0101-8, T0101-10, T0101-12 adsorption tower are formed another series; Dispose one respectively along the venting surge tank two series, each series is along putting back to sequencing valve of configuration on the road, configuration one or two control valves on the flush loop of downflow releasing tank outlet.
From time-scale as can be known, every adsorption tower experience absorption (A) successively in a cycle period, one time (E1D) falls in isostasy, (E2D) falls in the secondary pressure equilibrium, three times (E3D) falls in isostasy, four times (E4D) falls in isostasy, five times (E5D) falls in isostasy, six times (E6D) falls in isostasy, 1 step is along putting (PP), contrary put (D), 3 step flushings (P), six isostasy liters (E6R), five isostasy liters (E5R), four isostasy liters (E4R), three isostasy liters (E3R), balanced rise (E2R) of secondary pressure, an isostasy liter (E1R), (FR) finally boosts.All the other adsorption towers also experience same process, just stagger mutually on the time.
This technology can realize that also two series wash respectively or turn interleaving flushing, and under the flushing recovery time prerequisite that guarantees more than 90 seconds, absorption also has only 180 seconds (A) total time, compares with the traditional PSA device, and investment reduces greatly, and hydrogen yield reaches 92.5%.

Claims (6)

1, a kind of pressure swing absorption process with two downflow releasing tanks, it is characterized in that the adsorption tower of pressure-swing absorption apparatus is divided into two series, downflow releasing tank of each array configuration is used to store the suitable venting for adsorption tower regeneration usefulness, each series along put and flush loop on configuration sequencing valve and control valve, this pressure-swing absorption apparatus rinsing step is the normal pressure flushing, the experience absorption successively in circulation once of each adsorption tower, at least once all pressure drops, step are along putting, reversely putting pressures, the flushing of a plurality of step, and at least once all voltage rise reaches the step of finally boosting.
2, method according to claim 1, the feed end that it is characterized in that the adsorption tower that each is serial connects the unstripped gas input pipe by sequencing valve, the product end is by the sequencing valve product gas efferent duct of practicing midwifery, the product end of the adsorption tower that each is serial is public along putting back to the inlet that the road connects this serial downflow releasing tank by one, connect the outlet of this serial downflow releasing tank by a public flush loop, each adsorption tower is respectively put back to road and flush loop by a sequencing valve smoothness, and the outlet of the downflow releasing tank that each is serial connects this serial flush loop by a control valve.
3, method according to claim 2 is characterized in that the outlet of the downflow releasing tank that each is serial connects another serial flush loop by another control valve.
4, method according to claim 1 is characterized in that connecting by a hand stop valve along putting back to the road of two series.
5, method according to claim 1, it is characterized in that pressure-swing absorption apparatus is the continuous movement system that the adsorption tower more than 8 or 8 is formed, the experience absorption successively in circulation once of each adsorption tower, at least once all pressure drops, step along put, reversely put pressures, the flushing of a plurality of step, at least once all voltage rise reaches the step of finally boosting.
6, method according to claim 1 and 2, the pressure gauge pressure that it is characterized in that adsorption step is 0.8～5.0MPa, and rinsing step bed layer pressure gauge pressure is 0.01～0.1MPa, and operating temperature is 10-45 ℃.
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CN1355131A (en) * 2000-12-01 2002-06-26 四川天一科技股份有限公司 Process for extracting high-purity hydrogen from coke oven gas
US6503299B2 (en) * 1999-11-03 2003-01-07 Praxair Technology, Inc. Pressure swing adsorption process for the production of hydrogen

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CN1146369A (en) * 1996-06-10 1997-04-02 伍仁兴 Multi-tower pressure-changeable gas-adsorption separation method
US6503299B2 (en) * 1999-11-03 2003-01-07 Praxair Technology, Inc. Pressure swing adsorption process for the production of hydrogen
CN1355131A (en) * 2000-12-01 2002-06-26 四川天一科技股份有限公司 Process for extracting high-purity hydrogen from coke oven gas

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