CN107349746A - The pressure swing absorption process of pressure change coordinated signals in a kind of circulate operation - Google Patents

Abstract

The invention discloses a kind of pressure swing absorption process of pressure change coordinated signals in circulate operation, it is related to the technical field of PSA Gas Separation Technology, the pressure swing absorption process to the adsorption and desorption circulate operation process of pressure swing adsorption system by simulating, the boundary condition imported and exported by adsorption tower in simulation determines mechanical designated mode, autonomous determinating mode and the autonomous integrated mode of machinery, the pressure swing adsorption system by least two adsorption tower groups into one or more groups of absorption tower sections form；The coordinated signals that the control model of determination is combined with sequence valve regulating valve, according to the instant pressure in two or more target affinity towers as reference frame, by adjusting valve combination Push And Release and aperture, in instant coordinated signals gas flow rate and target affinity tower and inlet and outlet pressure trend, with increase pressure-swing absorption apparatus to unstripped gas form and pressure and the adsorption and desorption circulate operation of pressure-variable adsorption during each step pressure change fault-tolerance.

Description

The pressure swing absorption process of pressure change coordinated signals in a kind of circulate operation

Technical field

The present invention relates to the technical field of PSA Gas Separation Technology, and in particular to pressure becomes in a kind of circulate operation Change the pressure swing absorption process of coordinated signals.

Background technology

Pressure-variable adsorption (Pressure Swing Adsorption, abbreviation PSA) refers to, at a certain temperature, by adding Pressure absorption and decompression (vacuumizing) or normal pressure desorption or the cyclic process for rinsing displacement regeneration, realize that separation carries by gas mixture Pure and purification.It can be seen that PSA is to reach the purpose of absorption and desorption by changing pressure or pressure change.Absorption is frequently in Carried out under pressure environment, pressure-variable adsorption proposes pressurization and the method that is combined of decompression, at a certain temperature, it be typically by Pressurized adsorbent, decompression regenerate formed absorption-desorption (regeneration) circulate operation system.Adsorbent to the adsorbance of adsorbate with The rise of pressure and increase, and reduced with the reduction of pressure, while during (be down to normal pressure or vacuumize) is depressurized, Adsorbed gas is released, makes adsorbent reactivation, so as to realize the separation of multicomponent mixed gas or purification, the external world need not supply Heat can carry out the regeneration of adsorbent.Thus, in the circulate operation of PSA absorption-desorptions, the pressure of adsorption step keeps steady It is fixed, and by equal pressure drop, along put, inverse put, vacuumize/rinse, pressure rises, the desorption process that step forms such as fills eventually, adsorption tower Operating pressure is constantly to change, and the change of this pressure, directly influences the separative efficiency and reality of desorption and absorption Operating result, wherein, pressure in desorption process (equal pressure drop rises with pressure), along put be in PSA cycle operation pressure change compared with Big step.

In PSA technological designs, using process analogy method, the constantly expansion of PSA unit scales is played vital Effect, and the limitation of experimental provision can be broken through, while the cost of experiment can be saved.Flowed using process simulation and optimization PSA Journey, the various technological parameters of flow can be carried out with optimized design, such as absorption and desorption pressures and its change, the operation of each step Time, flushing and replacement amount, inlet and outlet flow, valve opening, adsorption tower ratio of height to diameter etc.；Process simulation and its optimization can be lifted The performance of PSA devices and technology, such as improve the purity and yield, the specific yield for lifting adsorbent, reduction process of product Unit consumption.The process simulation of PSA adsorption-desorption cycle operating process, including adsorption tower, valve, surge tank, vacuum Pump, compressor, wherein, adsorption tower model is the core of whole flow process model, and it includes, mass balance, momentum balance, energy weighing apparatus Calculation, adsorption equilibrium (characteristic) equation, mass transfer model, inlet and outlet boundary condition, the equation of gas state, these partial differential equation The mathematical modeling of adsorption tower is together constituted with Algebraic Equation set.And the inlet and outlet boundary condition of adsorption tower, it is to form closing PSA Each step boundary condition in the operation of the necessary condition of flow mathematical modeling, especially PSA cycle, including adsorb, replace, press Drop, along put, inverse put, flushing/vacuumize, pressure rise, filled eventually, and to adsorption tower " three biographies-quality, momentum, energy transmission " Whether the operation of balance, adsorption tower in optimal released state and meets that design requirement etc. plays a key effect.In general, The inlet and outlet boundary condition of adsorption tower process simulation determines that pattern has two kinds, and one kind is that machinery is specified, and one kind is according to inlet and outlet Velocity attitude independently judges (also referred to as " being in harmony certainly ").In the operation of most of PSA cycles, typically in advance by providing adsorption tower stream Tower height and tower diameter, adsorbent inventory, suction are designed after the settings of parameter such as rate of flow of fluid, the flow velocity of inlet and outlet, pressure, temperature Attached time, desorption procedure and corresponding time etc., to realize the circulate operation of absorption-desorption, and then the purpose separated, i.e. Adsorption tower inlet and outlet boundary condition in traditional PSA circulate operation has provided in design, need not in actual motion Still further determine.In addition, the pressure change control method in traditional PSA cycle operation, is by between adsorption tower mostly Installation procedure control valve controls on pipeline, wherein, sequence valve is by default sequential and configuration, by advance really Determine the flow velocity in adsorption tower and in the pipeline of connection adsorption tower, pressure difference and press the time, and the Push And Release for passing through sequence valve Control, it is that a kind of the of specific implementation of the inlet and outlet pre-determined value of boundary condition of adsorption tower is controlled, i.e. sequence valve Door only carries out the switch of autocontrol valve by the program set and realizes the adsorption-desorption cycle between adsorption tower and operate During each step carry out, used in adsorption tower process simulation.In this way, adsorption tower inlet and outlet boundary condition solidification and The inlet and outlet boundary condition in PSA designs is determined in advance and determines that pattern does not associate, and only opening by programme-control valve Realize the circulate operation of PSA absorption-desorption processes with closing, there is it is following many problem of：

First, when there is larger fluctuation in raw gas pressure and the corresponding other factors for having influence on pressure change, such as component, Treating capacity, temperature etc., pre-determined adsorption tower inlet and outlet boundary condition and completed PSA adsorption and desorptions have been solidificated in it and have followed The design of ring technique, can not reasonably it be adjusted in practical operation.Such as when raw gas pressure drops to from 1.0MPa During 0.6MPa, the inlet and outlet flow velocity of adsorption tower varies widely therewith.The adsorbent inventory in the height of adsorption tower and tower , can only be by the adjustment of adsorption time in the case of certain, for example extend adsorption time and adapted to, meanwhile, connect each suction Programme-control valve on the pipeline of attached tower inlet and outlet, can only also carry out the control of Push And Release according to the time adjusted.But inhale Attached time lengthening can not accurately compensate for adsorption efficiency decline caused by adsorptive pressure decline, on the contrary, adsorption time prolongs The long absorption forward position that makes it possible to penetrates and causes the purity of non-adsorbed component (as product gas) to decline, or accordingly results in place Reason quantitative change mutually diminishes and can not meet output demand, or further desorption difficulty caused by intensification absorption excessively, or cause to solve Inhale the time and the problems such as improper and adsorbent service life shortens, product gas yield declines is distributed in each step；

Second, during PSA adsorption-desorption cycles, when the timing of unstripped gas feed conditions one, the pressure in cyclic process Change can by pressure between two or more adsorption towers (one or more adsorption towers (pressure output tower) to another or Multiple adsorption towers (pressure receives tower) forward bleed off pressure so that the pressure of two towers or multitower is equal) part compensation is obtained, reduce pressure Power drop loss.After adsorption step terminates, the product of more higher degree in the upper space (headspace) of adsorption tower be present Gas, meanwhile, the upper space is that the adsorbent for adsorbing forward position reaches far away saturation state, is underused.In order to make full use of Headspace is compared with pure product gas, and the pressure transmission by reducing adsorption tower is in the absorption preparatory stage to need to another The adsorption tower to be boosted, so as to realize its energy of recovery section and product gas component, while improving product gas yield, Avoid regeneration pressure decline it is excessive and caused by wash away that serious, air velocity is too fast etc. to be caused regeneration not exclusively or inhale to adsorbent The appearance for the problems such as attached dose of service life declines, the mode of operation repeatedly pressed between each adsorption tower of generally use are especially high Press absorption working condition.Theoretically, number increase is pressed, the yield of product gas is increased by, and the pressure in desorption process is at any time Between and become pressure curve it is relatively gentle, it is relatively also favourable to mass transfer.When pressure number increases to relatively infinitely great, pressure curve A smooth curve is reformed into, product gas yield reaches a certain extreme value, and it is relatively minimum that influence is washed away on adsorbent.But Pressure number increase can bring the problem of many negative：1) equipment increase, investment increase, operational stability decline, taken up an area on the contrary Area increase.In order to meet the needs of adsorption and desorption circulate operation, excessive pressure number is, it is necessary to more adsorption tower, journeys Sequence control valve and corresponding installation space, especially sequence valve, failure is more, the stability of extreme influence device operation； 2) the increased marginal benefit of product gas yield is to decline.For example hydrogen is reclaimed for hydrogen-containing gas, press number reaching 3 At more than~4 times, often increase and once press, its effect that tapers off that gathers way to hydrogen yield；3) press the time too short, Gas flow rate is too fast during pressure, causes to regenerate incomplete, the easy efflorescence of adsorbent.Because the time of adsorption and desorption needs mutual Match somebody with somebody, just can be with circulate operation.In the case where the number of adsorption tower and absorption-desorption time are certain, press number more, its list The time needed for change that position is pressed is shorter, or the frequency of the pressure oscillation in its unit interval is just also frequent, will influence Mass-transfer efficiency in desorption, meanwhile, relative pressure drop is larger in the unit interval, and every time press the time so that adsorbent by To wash away number and to wash away variation quite frequent, easily cause absorbent atomizing so that adsorption-desorption circulate operation is present Larger potential safety hazard；4) certain negative effect is caused to the concentration distribution of composite bed, exists between different adsorbents and hand over Fork pollution.In adsorption and desorption circulation, corresponding mass transfer rule is different in the unit interval, during unit in low pressure stage Interior pressure curve is not quite similar with pressure curve in the unit interval in high pressure section, in the unit interval on different adsorbents Pressure curve is also not quite similar.Therefore, press number more, the mass transfer rule pressed every time, frequency, flow velocity etc. phase not to the utmost Together, cause the complexity of mass transfer, greatly influence some primary conditions of model assumed in the design of adsorption tower, including inhale The determination of the inlet and outlet boundary condition of attached tower；5) to the problem of more reverse concentration gradient in headspace be present, greatly Influence the purity of product gas.Press number more, impurities concentration distribution and concentration in each absorption column overhead headspace The direction go of ripple movement, the concentration of impurity composition is caused to occur certain reverse concentration along product gas stream outgoing direction Change, i.e. impurity composition is accumulated in tower top headspace, influences the purity of product gas, is especially needing high-purity to produce Under the operating mode of product gas, the reverse concentration gradient phenomenon of tower top headspace can have a strong impact on that the purity Coriolis mass of product gas refers to Mark；6) it is high to the quality requirement of sequence valve.Due to pressing number to increase, the quantity of sequencing valve is consequently increased, and, unit Time internal drop changes greatly, and flow velocity is too fast, causes to wash away the valve element of sequencing valve with valve seat more serious, and then causes valve body Leakage, influence the stability and security of whole device；

3rd, the PSA higher to active principle content in unstripped gas extract operating mode, such as, it is 88~95% containing hydrogen concentration The reformation hydrogen of (v/v, similar below), methane hydrogen etc. carry out PSA for unstripped gas and carry hydrogen, or, obtain product gas from absorption phase Operating mode, such as, carbon two and the above (C2+) component are reclaimed from oil refinery dry gas by PSA methods, is converted from lighter hydrocarbons in gas and reclaims dioxy Change the operating modes such as carbon (CO2), " inverse ratio of the purity and yield " relation faced in traditional PSA operating process --- in certain work Under condition, higher purity of product gas can be ensured by lowering yield, or, to ensure that it is pure that certain product gas yield lowers product gas Degree, become " purity and yield double down " relation, this is due to pressure number excessive in desorption process and along putting so that stagnant The impurity composition stayed in the dead space in adsorption tower easily forms adsorption equilibrium with active principle, causes the product repeatedly pressed Gas yield not but not increase, on the contrary with purity of product gas decline and decline.Meanwhile adsorption column outlet boundary condition, such as Flow velocity and the small change of pressure, just influence whether the adsorption and desorption mass transport process in adsorption tower, and adsorption time is longer, Desorption is more difficult, or, adsorption time is shorter, and desorption is more difficult to match with absorption and form recyclable operation；

The main purpose that 4th, traditional PSA are pressed for more times is to reduce the pressure of adsorption tower to reclaim having for upper space Imitate gas component.In engineering, some designs are the PSA techniques of non-power consumption, and its essence is exactly that cancellation vacuumizes, and is changed to countless Repeatedly press to achieve the goal.But countless repeatedly press the high-recovery that can realize product gas in theory；But in order to Realize that for countless multiple pressures, it is necessary to increase substantial amounts of adsorption tower and sequencing valve, this undoubtedly significantly increases the floor space of device, Sequencing valve increases the reliability for also reducing device；In order to meet repeatedly to press number, the whole adsorption and desorption cycle is elongated, Cause the adsorption time of single adsorption tower elongated, significantly increase the adsorbent inventory and increase depth of single adsorption tower The problem of adsorbing and causing desorption more difficult.Meanwhile if there is larger ripple in raw gas pressure, composition etc. in actual mechanical process When dynamic, it is this because of fluctuation and caused by off-design when determined by parameters, can be transmitted in each adsorption tower and cause partially From the accumulation of degree, it is not up to standard or unstable to eventually result in whole PSA devices.Although it can be reduced from multitower running mode switching Number is pressed to tackle unstripped gas fluctuation operating mode, for example is originally PSA10-2-6 patterns, i.e. 10 towers, wherein, 2 tower absorption, Press for 5 times, be changed to PSA10-3-3 operational modes, i.e. 10 towers, the absorption of 3 towers is pressed for 3 times.Due to each absorption in former design The inlet and outlet boundary condition of tower has been fixed, and PSA operational modes change, only the adjustment by sequential and corresponding sequence valve Door realizes, therefore, the control and adsorption tower inlet and outlet boundary condition for being easy to programme-control valve occur are serious inconsistent Flow velocity and pressure change in problem, especially cyclic process so that PSA operations are extremely unstable, finally occur that adsorbent makes Declined with the lost of life, or purity and yield, or the failure such as the damage of programme-control valve and leakage, plant running is not up to standard to be difficult to Solve.

The content of the invention

The present invention provides a kind of pressure swing absorption process of pressure change coordinated signals in circulate operation, traditional to solve Psa process design there is deviation between actual motion and there is adsorption tower inlet and outlet boundary condition set and adsorbed with being connected Play on inlet and outlet pipeline between tower and only Push And Release programme-control valve do not link etc. caused by unstripped gas fluctuation Bad adaptability, by improve yield use pressure number it is excessive caused by cost of investment height with stability is poor, some operating modes go out The technical problem that existing " yield and purity " is double down, adsorbent service life shortens and programme-control valve fault rate is high.

The technical solution adopted by the present invention is as follows：

The pressure swing absorption process of pressure change coordinated signals in a kind of circulate operation, the pressure swing absorption process pass through to transformation The adsorption and desorption circulate operation process of adsorption system is simulated, and the boundary condition imported and exported by adsorption tower in simulation is determined Mechanical designated mode, autonomous determinating mode and the autonomous integrated mode of machinery, the pressure swing adsorption system is by least two adsorption towers One or more groups of absorption tower sections composition of composition；The linkage control that the control model of determination is combined with sequence valve-regulating valve System, according to the instant pressure in two or more target affinity towers be used as reference frame, by adjust valve combination open and Close and aperture, in instant coordinated signals gas flow rate and target affinity tower and inlet and outlet pressure trend, to increase transformation Adsorbent equipment is to each step during the composition and pressure of unstripped gas and the adsorption and desorption circulate operation of pressure-variable adsorption The fault-tolerance of pressure change.

Preferably, the pressure swing absorption process includes following process：

(1) adsorb：Unstripped gas with certain pressure is sent into any the 1 of pressure swing adsorption system through air inlet pipe, air intake branch Individual or multiple absorption tower bottoms, the interior filling adsorbent of adsorption tower, by unstripped gas under the adsorption operations pressure of raw gas pressure The absorption of adsorbate component, for non-adsorbed component then from the escape pipe output at the top of corresponding adsorption tower, its pressure is equal to absorption Operating pressure；Wherein, the determination of the inlet and outlet boundary condition of the adsorption tower in adsorption step, using mechanical designated mode, if Determine the inlet and outlet pressure that adsorption tower inlet and outlet pressure is equal or overcomes bed resistance to drop, now, the adsorption tower in adsorption step Sequence valve-the regulating valve being connected between the adsorption tower of desorption process, which combines, to be closed, the non-adsorbed component in part The end that gas is used for another adsorption tower fills；

(2) equal pressure drop：Unstrpped gas is passed through after the completion of absorption in adsorption tower, and above-mentioned steps participate in the adsorption tower of absorption Inlet and outlet boundary condition determines the adsorption tower inlet and outlet boundary condition that pattern is specified using above-mentioned adsorption step machinery, now, place In the escape pipe of the adsorption tower of pressure output state or adsorption tower in equal pressure drop state be through balance pipe and other any 1 Or multiple rinsing step is completed and pressure that the receiving in minimum pressure are pressed receives the top of adsorption tower or bottom passes through Sequence valve-regulating valve combination, which is connected, carries out decompression discharge gas, until two or more corresponding pressure receive tower Pressure is equal, that is, forms intermediate pressure, wherein, sequence valve-regulating valve combination is depressurized and discharges gas process and pressure The mechanical designated mode for the inlet boundary condition that the outlet of power output tower and pressure receive tower is connected, so as to adjust automatically and really The equal pressure drop time of constant-pressure output tower and equal voltage drop step are equably carried out, and prevent equal pressure drop amplitude from excessive causing stream in moment Washing away caused by fast amplitude of variation is excessive, and the pressure for finally receiving tower with pressure is equal, thus, the pressure of pressure output tower Change is reclaimed in pressure receives tower, and is gathered in after correspondingly having reclaimed completion adsorption step in pressure output tower extremely Active principle in space and improve yield；

(3) it is suitable to put：Complete to press and the pressure output tower in higher intermediate pressure power continues the border specified according to machinery Condition determination mode, forward bled off pressure further along gas flow direction, and equably bleed off pressure relatively low intermediate pressure, prevent from putting Press through journey it is excessive and cause change in flow it is excessive caused by the combination of washing programme control valve-regulating valve, now, it is defeated to continue pressure The escape pipe for going out tower is to combine one or more corresponding with other through sequence valve-regulating valve to be in the absorption of rinsing step The top of tower is connected, decompression discharge gas, until pressure reaches along the mechanical designated value for putting tower export boundary condition, wherein, journey Sequence control valve-regulating valve combination is depressurized and discharges gas process and put the outlet of tower and the inlet boundary condition of purge column with suitable Mechanical designated mode be connected, so as to adjust automatically with determine pressure output tower along putting the time and final outlet pressure refers to Definite value；Thus, recovery has been got in the middle part of purge column along the pressure change for putting tower, and has further reclaimed completion and pressed step In be gathered in along putting the active principle in tower in dead space and improve yield, while save purge column and carry out needed for step The dosage being rinsed using product gas；

(4) inverse put：Complete to carry pressure along inside the adsorption tower after strideing suddenly, then through one section of inverse put pipe, by program control Valve processed-regulating valve combination is inversely depressurized along the opposite direction of unstripped gas flowing and discharges stripping gas, further reduces absorption Pressure tower, now, the inlet boundary condition of inverse put tower determine that pattern is inverse by being switched to along the outlet machinery designated mode for strideing rapid The autonomous determinating mode of tower inlet boundary condition determination is put, and combines inverse put valve with sequence valve-regulating valve and carries out linkage control System, wherein, autonomous determinating mode is carried out from main modulation according to inverse put tube fluid flow velocity and the distribution of inverse put tower inner fluid speed, is entered And the steady state operation of inverse put process in inverse put tower is maintained, until including pressure, flow velocity specified by inverse put tower export boundary condition Value；The export boundary condition of inverse put tower determines that pattern is still carried out along used inlet boundary condition when strideing rapid using the tower Mechanical designated mode；

(5) rinse：The escape pipe for completing the adsorption tower after inverse put step is forward or inversely to be introduced through flushing valve from just Carrying out along rapid adsorption tower of strideing along deflation, or from product gas, the minimum adsorption tower is in pressure in circulate operation It is rinsed so that the adsorbent reactivation loaded in adsorption tower is complete.Now, the inlet and outlet boundary condition of purge column determines mould Formula uses mechanical designated mode, and is combined with sequence valve-regulating valve and carry out coordinated signals, until purge column outlet border bar Pressure or flow speed value specified by part, from the flushed gas of purge column outlet outflow, discharge, or return as stripping gas Active principle is further reclaimed to unstripped gas；

(6) evacuate：The adsorption tower after inverse put and rinsing step is completed, adsorption tower is evacuated by vavuum pump, inversely Extraction is still trapped in the foreign gas in adsorption tower on adsorbent and in dead space, so as to complete the regeneration of whole adsorbent Journey, so that the tower carries out the circulate operation of pressure-variable adsorption absorption-desorption next time；Now, the inlet boundary condition of vacuum column is true Fixed pattern is judged using autonomous, and export boundary condition determines that pattern is specified for machinery；Gas caused by evacuation is as desorption Gas is discharged, and without sequence valve-regulating valve combination on discharge pipe, does not also determine that pattern joins with vacuum column inlet and outlet boundary condition Dynamic control；

(7) pressure rises：The pressure for completing the adsorption tower after evacuation step is in pressure minimum in pressure swing adsorption cycles operation Stage, now, the adsorption tower air inlet pipe are carrying out the adsorption tower of equal voltage drop step through balance pipe and other any one or more Top or bottom be connected by the combination of sequence valve-regulating valve and boosted to input gas, until two or more The pressure of corresponding pressure output tower is equal, that is, forms intermediate pressure or adsorptive pressure, wherein, sequence valve-regulation valve group Conjunction is boosted and inputs gas process and receive the mechanical finger of the import of tower and the export boundary condition of pressure output tower with pressure Mould-fixed is connected, so that adjust automatically is with determining that pressure receives the pressure liter time of tower and pressure liter step is equably carried out, Prevent press increasing degree degree moment it is excessive cause change in flow amplitude it is excessive caused by wash away, and finally with pressure output tower Pressure is equal；Thus, pressure receives recovery of the pressure change in the pressure energy loss caused by the decompression of pressure output tower of tower, and phase Serve pre- suction-operated with answering, prepare subsequently to travel further into formal adsorption step, thus also improve adsorption efficiency；

(8) fill eventually：The pressure for completing the adsorption tower after pressure liter step is in intermediate pressure, it is necessary to further boost to suction Enclosure pressure, from the escape pipe of the adsorption tower, through filling the reverse introducing portion fluid phase gas of pipe or unstrpped gas eventually to raise end Pressure tower is filled to adsorptive pressure, prepares adsorption step.Now, filling the inlet and outlet boundary condition of tower eventually, mould-fixed uses machine really Tool designated mode, and sequence valve-regulating valve with filling eventually on pipe combines and carries out coordinated signals；After completing to fill step eventually, Thus the cyclic process of one absorption-desorption of pressure-variable adsorption terminates, into a new circulate operation cycle.

Preferably, each adsorption tower imports and exports sequence valve on connected pipeline-regulating valve combination, including two Every two rows sequence valve between sequence valve series connection one regulating valve, or the multigroup adsorption tower of multitower between individual adsorption tower Between connect a regulating valve, or the sequence valve alternative program control valve with regulatory function, or equalizing valve and release valve Using sequence valve-regulating valve combination, wherein, for valve using unidirectional or bidirectional modulation, its type is butterfly valve, stop valve, rotation One or more in plug valve, ball valve, gate valve, needle valve, diaphragm valve or other can play it is slow, voltage stabilizing, regulation flow and Pressure, water conservancy diversion, the control valve or device for preventing adverse current, shunting or overflow pressure relief effect.

Preferably, in the pressure-variable adsorption adsorption and desorption circulate operation system, product gas is to come from inverse put or punching Wash or stripping gas that vacuum step is formed, before equal voltage drop step starts after adsorption step terminates or after along rapid terminate that stride Inverse put step sets up displacement step before starting, i.e., using product gas as substitution gas, displace the adsorbing contaminant group of eutectoid content Point and adsorption tower in impurity composition in dead space；Substitution gas forward enter adsorption tower from adsorption tower import, go out from adsorption tower Mouth outflow displacement waste gas, or unstripped gas is returned to, or discharge battery limit (BL) directly as waste gas.

Preferably, the unstripped gas is the pressure feed gas that pressure is less than 1.0MPa, its pressure or feed gas composition Concentration causes range of pressure fluctuations to be more than ± 10% with other factors, or is more than 1.0MPa mesohigh unstripped gas for pressure, Its pressure or feed gas composition concentration cause range of pressure fluctuations to be more than ± 5% with other factors, by least two adsorption tower institute group Into pressure swing adsorption system adsorption and desorption circulate operation system in, the change of the operating pressure of each step is by each absorption The boundary condition of the autonomous judgement of tower inlet and outlet determines that pattern imports and exports program on connected pipeline with corresponding each adsorption tower Control valve-regulating valve integrated mode carries out coordinated signals to realize.

Preferably, the adsorption tower in described pressure swing adsorption system, including one or more are filled with one kind or more The adsorption tower of kind sorbing material, the sorbing material are activated alumina, activated carbon, silica gel, molecular sieve and other loads, are modified Sorbing material one or more.

Compared with prior art, the beneficial effects of the invention are as follows：

(1) boundary condition (quality control software) and journey of the adsorption tower inlet and outlet during the present invention is simulated by psa process The coordinated signals of sequence control valve-regulating valve combination, according to the instant pressure in two or more target affinity towers be used as with reference to according to According to by adjusting the Push And Release and aperture of valve combination, instant coordinated signals gas flow rate and target affinity tower are interior and import and export Pressure trend, thereby increase PSA devices to the composition of unstripped gas and the fault-tolerance of pressure change so that device is more steady Fixed efficient operation, be especially suitable for adapting to unstripped gas conditional fluctuation is larger and PSA adsorption-desorption cycle operating process in pressure become Change larger operating mode；

(2) no longer washed away the invention enables adsorbent by high gas flow, be not easy to be worn, service life greatly prolongs, especially It is adapted to the operating mode that pressure oscillation is larger in high pressure PSA operating modes and PSA cycle operation；

(3) for the present invention by way of coordinated signals, the valve applying working condition of sequence valve-regulating valve combination is warmer With, valve element and valve seat are hardly damaged no longer by airflow scouring, significantly extend service life, and ensure that PSA cycle grasp The stability of work；

(4) rate of recovery of product gas of the present invention is high, can be pressed with 1~3 time, it is possible to achieve presses and delays equal process, and connects More than the 6 times effects that pressure technique is reached are bordering on, meanwhile, the process recovery ratio than equal pressure number of the prior art is high Go out at least more than 2~3%；

(5) present invention use coordinated signals desorption process in pressure change it is larger press, replace, forward bleed off pressure step Relax and carry out, ensure that equipment safety is high, change the operator scheme that flow velocity in these steps in the past is up to meter per seconds up to a hundred, avoid The problem of security extreme difference of device；

(6) product purity of institute's output of the present invention is more much higher than prior art equivalent fixture, especially to compound filling Mode, each bed of adsorbent by cross pollution, so as to which product purity be effectively ensured, and then do not solve prior art absorbing process The easy cross pollution of bed, separation is not thorough, the problem of product purity is not high, and the operating mode of product gas is especially mutually extracted from absorption；

(7) present invention can cause adsorbent inventory, equipment body under equal treatment scale and product index requirement Product, sequence valve or valve quantity for being combined with regulating valve etc. greatly reduce, and device gross investment also greatly reduces, plant running It is more stable reliable；Repeatedly the quantity of adsorption tower was more caused by pressure technique in the past for change, and volume is big, and plant area is big, investment Height, the problems such as device reliability is low；

(8) present invention is also particularly suitable for the Optimizing Reconstruction of existing PSA devices so that the product yield of original device improves nearly 2 More than~3%.

Brief description of the drawings

Fig. 1 is the schematic flow sheet of embodiment 1；

Fig. 2 is the schematic flow sheet of embodiment 2；

Fig. 3 is the schematic flow sheet of embodiment 3；

Fig. 4 is the schematic flow sheet of embodiment 4；

Fig. 5 is the schematic flow sheet of embodiment 5；

Fig. 6 is the schematic flow sheet of embodiment 6；

Fig. 7 is the schematic flow sheet of embodiment 7；

Scheming acceptance of the bid note is respectively：1st, air inlet pipe；2nd, adsorption tower；3rd, air intake branch；4th, escape pipe；5th, pipe is filled eventually；6th, one-level Balance pipe；7th, two level balance pipe；8th, it is suitable to put pipe；9th, flush pipe；10th, inverse put pipe；11st, valve is filled eventually；12nd, one-level equalizing valve；13rd, two Level equalizing valve；14th, it is suitable to put flushing valve；15th, flushing valve；16th, inverse put valve；17th, air outlet valve；18th, intake valve；19th, regulating valve is filled eventually； 20th, regulating valve is pressed；21st, it is suitable to put regulating valve；22nd, inverse put regulating valve；23rd, vacuum tube；24th, vacuum valve；25th, vacuum breaker； 26th, vavuum pump；27th, displacement pipe；28th, valve is replaced；29th, flue gas leading is replaced；30th, exhaust gas valve is replaced；31st, compressor；32nd, displacement gas Regulating valve；33rd, three-level balance pipe；34th, three-level equalizing valve；35th, product tracheae；

Explanation：One-level presses two level pressure equalizing to share firsts and seconds balance pipe；Shared along flushing process is put along putting pipe And flush pipe；Scheming acceptance of the bid note is respectively：--- single dotted line is that adsorption tower inlet and outlet boundary condition determines that pattern is specified for machinery；= =doublet is that adsorption tower inlet and outlet boundary condition determines that pattern judges (being in harmony certainly) to be autonomous.

Embodiment

In order that those skilled in the art more fully understands the present invention, below in conjunction with the accompanying drawing in the embodiment of the present invention Clear, complete description is carried out to the technical scheme in the embodiment of the present invention.

Embodiment 1

As shown in figure 1, in a kind of circulate operation pressure change coordinated signals pressure swing absorption process, it is described by 5 absorption The pressure-variable adsorption that one group of (section) pressure-variable adsorption (PSA) adsorption and desorption circulate operation system adsorption tower that tower is formed is formed (PSA) in adsorption and desorption circulate operation process simulation adsorption tower inlet and outlet boundary condition determine pattern (machinery specify, or It is autonomous to judge, or both of which combination) coordinated signals that are combined with sequence valve-regulating valve, according to two target affinity towers Interior instant pressure is as referring to evidence, by adjusting the Push And Release and aperture of valve combination, instant coordinated signals gas flow rate and In target affinity tower and inlet and outlet pressure trend, thereby increase composition of pressure-variable adsorption (PSA) device to unstripped gas And during pressure, and pressure-variable adsorption (PSA) adsorption and desorption circulate operation the pressure change of each step fault-tolerance, make The more stable safe and efficient operation of device, press in each step in each adsorption tower circulate operation of its pressure-variable adsorption (PSA) The coordinated signals of power change are as follows：

A, adsorb：Pressure is 2.4MPa, and for the hydrogeneous unstripped gas of normal temperature, (density of hydrogen is more than 50~60% to temperature, volume Than similar below) any 1 absorption of the pressure-variable adsorption being made up of 5 towers (PSA) system is sent into through air inlet pipe 1 and intake valve 18 In tower 2, the compound adsorbent of filling hydrogen concentration in adsorption tower 2, using the different adsorption capacities to different component, by unstripped gas In impurity composition absorption, effective gas composition hydrogen (product gas) as product gas then from the escape pipe 4 at the top of adsorption tower 2 with go out Air valve 17 continuously exports, and is connected and is turned off with the control valve of remaining 4 tower or other valves.Connection adsorption tower inlet and outlet are entered Air valve, air outlet valve are pneumatic shutoff valve, one kind as sequence valve.In this step, the inlet and outlet side of adsorption tower Boundary's condition determines that pattern is specified (single dotted line expression) for machinery, wherein, inlet pressure 2.4MPa, outlet pressure is close 2.4MPa, the bed resistance of adsorption tower 2 drop are disregarded.

The equal pressure drop of b1, one-level：Unstripped gas passes through after the completion of 240 seconds adsorption steps in adsorption tower 2, the disengaging of adsorption tower 2 Mouth boundary condition determines that pattern still specifies (single dotted line expression) using the machinery of adsorption step.Now, adsorption tower 2 (is also referred to as Pressure output tower or the equal pressure drop tower of one-level) escape pipe 4 be through one-level balance pipe 6 with other any 1 completed once to press liter The charging of step and adsorption tower 2 (be also referred to as pressure receive tower or one-level crimp by tower) that receivings in lower pressure is pressed End by by one-level balance pipe 6 through one-level equalizing valve 12 through pressing regulating valve 20 through two level balance pipe 7 and the institute of two level equalizing valve 13 The sequence valve of composition-regulating valve combination (equalizing valve combination), which is connected, carries out decompression discharge gas, until corresponding to two The pressure that pressure receives tower is equal, that is, it is 1.6MPa to form intermediate pressure.Wherein, according to two target suctions for carrying out one-level and pressing Instant pressure (mechanical designated value) in attached tower 2 is used as reference frame, by adjusting the Push And Release and aperture of valve combination, immediately In coordinated signals gas flow rate and target affinity tower 2 and inlet and outlet pressure trend so that two carry out what one-levels were pressed The equal voltage drop step of one-level equably carries out (slow equal) to target affinity tower 2 at the appointed time, prevents equal pressure drop amplitude in moment mistake It is big to cause change in flow amplitude is excessive caused to wash away, and intermediate pressure 1.6MPa as defined in formation.The program control of this step Valve-regulating valve processed is combined as, and any two is on the disengaging orotracheal tube of adsorption tower 2 that one-level is pressed and all configured in 5 adsorption towers Corresponding inlet and outlet one-level equalizing valve 12 (sequence valve), pressure regulating valve 20 with unidirectional regulatory function, two level The implementation in parallel for carrying out one-level and pressing step of equalizing valve 13.Thus, the pressure change (reduction) of pressure output tower receives in pressure Reclaimed in tower, and correspondingly reclaimed complete adsorption step after be gathered in pressure output tower effective group in dead space Divide hydrogen and improve yield；

The equal pressure drop of b2, two level：The inlet and outlet boundary condition for completing the adsorption tower 2 of the equal voltage drop step of one-level determines pattern still Using mechanical designated mode (single dotted line expression).Now, adsorption tower 2 (also referred to as pressure output tower or the equal pressure drop tower of two level) outlet Pipe be through balance pipe with other any 1 completed rinsing step and adsorption tower 2 that the receiving in minimum low-pressure is pressed ( Referred to as pressure receives tower or two level and crimped by tower) feed end pass through and adjusted by one-level balance pipe 6, one-level equalizing valve 12, pressure The sequence valve that section valve 20, two level balance pipe 7, two level equalizing valve 13 are formed-regulating valve combination (equalizing valve combination) is connected And press step to continue decompression discharge gas according to one-level, the equal voltage drop step of two level equably carries out (slow equal) decompression discharge Gas, prevent two level pressure drop amplitude moment it is excessive cause change in flow amplitude it is excessive caused by wash away, and until two The pressure that corresponding pressure receives tower is equal, that is, it is 0.8MPa to form intermediate pressure.Thus, the pressure of pressure output tower is further Reduction reclaimed in pressure receives tower, and correspondingly further reclaimed that to be gathered in pressure after completion adsorption step defeated Go out the active principle hydrogen in tower in dead space and further increase yield.

C, it is suitable to put：The pressure output tower completed secondary press and be in relatively low intermediate pressure (0.8MPa) continues according to machine The boundary condition that tool is specified determines pattern (single dotted line expression), forward bleeds off pressure and is bled off pressure more further along gas flow direction Low intermediate pressure (0.2MPa), now, continue to bleed off pressure be from the escape pipe 4 of pressure output tower be via along put pipe 8, along putting punching Wash valve 14, along the sequence valve-regulating valve combination (release valve combination) for putting regulating valve 21, flush pipe 9, flushing valve 15 are formed The top of 1 corresponding with other adsorption tower 2 in rinsing step is connected, and decompression discharge gas, is put until pressure reaches suitable The mechanical designated value 0.2MPa of tower export boundary condition, wherein, sequence valve-regulating valve combination is depressurized and discharges gas Process is connected with the suitable mechanical designated mode (single dotted line expression) for putting the outlet of tower and the inlet boundary condition of purge column, so as to According to determined in the predetermined time pressure output tower along putting the time and equably carry out to final outlet pressure suddenly along strideing Designated value (0.2MPa), prevent from forward bleeding off pressure amplitude moment it is excessive cause change in flow amplitude it is excessive caused by wash away.By This, has got recovery, and further reclaimed completion two level and pressed along the pressure change (reduction) for putting tower in the middle part of purge column It is gathered in step along putting the active principle hydrogen in tower in dead space and improve yield, while saves purge column and walked The rapid required dosage being rinsed using product gas；

D, inverse put：Complete to carry pressure (along the designated value 0.2MPa reached after putting) along the inside of adsorption tower 2 after strideing suddenly, Then (inverse put is combined via sequence valve-regulating valve of one section of inverse put pipe 10, inverse put valve 16 and inverse put regulating valve (22) composition Valve) inversely depressurized along the opposite direction of unstripped gas flowing and discharge gas (stripping gas), further reduce adsorption tower 2 and press Power.Now, the inlet boundary condition of inverse put tower determines pattern by along the outlet machinery designated mode (single dotted line expression) for strideing rapid Pattern (doublet expression) (is in harmony) in the autonomous judgement for switching to the determination of inverse put tower inlet boundary condition certainly, and with sequence valve- Regulating valve combination (inverse put valve) carries out coordinated signals, wherein, autonomous determinating mode (doublet expression) is according to stream in inverse put pipe 10 Rate of flow of fluid and the distribution of inverse put tower inner fluid speed are carried out from main modulation, and then maintain the steady state operation of inverse put process in inverse put tower, Until pressure and flow speed value specified by inverse put tower export boundary condition.The export boundary condition of inverse put tower determines that pattern is still adopted Carried out with the tower (2) along used inlet boundary condition machinery designated mode (single dotted line expression) when strideing rapid.Inverse put step The reverse gas of discharge reaches qualified emission standard straight and run in sky, or be admitted to cartridge as fuel gas as stripping gas Net or flare system；

E, rinse：The escape pipe 4 for completing the adsorption tower 2 after inverse put step be via along put pipe 8, along putting flushing valve 14, suitable Put regulating valve 21, sequence valve-regulating valve combination that flush pipe 9, flushing valve 15 are formed forward is introduced from carrying out Along the adsorption tower 2 for strideing rapid along deflating, the minimum adsorption tower (purge column) (2) is in pressure in circulate operation and rushed Wash so that the adsorbent reactivation loaded in adsorption tower is complete.Now, the inlet and outlet boundary condition of purge column determines that pattern uses Mechanical designated mode (single dotted line expression), and combine (flushing valve) with sequence valve-regulating valve and carry out coordinated signals, until punching Wash pressure (normal pressure) or the flow speed value specified by tower export boundary condition.The flushed gas flowed out from purge column outlet, Discharged as stripping gas；

F2, two level press liter：The pressure for completing the adsorption tower after rinsing step is in pressure in pressure swing adsorption cycles operation Minimum stage, now, adsorption tower (pressure receives tower or two level and the presses a liter tower) air inlet pipe 1 or air intake branch 3 are pressed through two level The top of pipe 7 and other any 1 adsorption tower (pressure output tower or the equal pressure drop tower of two level) for carrying out the equal voltage drop step of two level Combined (by the sequence valve-regulating valve for pressing regulating valve 20, one-level equalizing valve 12 to be formed by two level equalizing valve 13 at end Valve combination) it is connected and is equably boosted and inversely input gas, preventing from boosting in moment, amplitude is excessive causes gas flow rate Change excessive and cause to cause serious wash away to adsorbent bed in valve, pipeline and adsorption tower 2.Two level press rise until The pressure of two corresponding adsorption tower 2 is equal, that is, forms intermediate pressure 0.8MPa, wherein, sequence valve-regulating valve combination Boosted and input gas process and receive the machinery of the import of tower and the export boundary condition of pressure output tower with pressure and specified Pattern (single dotted line expression) is connected, so that adjust automatically rises time and finally defeated with pressure with determining that pressure receives the pressure of tower The pressure for going out tower is equal.Thus, pressure receives the pressure change (rise) of tower in the pressure energy damage caused by the decompression of pressure output tower The recovery of mistake, and correspondingly serve pre- suction-operated；

F1, one-level press liter：Completing two level presses the inlet and outlet boundary condition of the adsorption tower 2 of liter step to determine pattern still So use mechanical designated mode (single dotted line expression).Now, adsorption tower 2 (also referred to as pressure receive tower or one-level press a liter tower) goes out Tracheae 4 is defeated through one-level balance pipe 6 and other any 1 pressure for carrying out the equal voltage drop step of one-level and being in elevated pressures The port of export of the adsorption tower 2 gone out passes through by two level equalizing valve 13, one-level equalizing valve 12, the program control that pressure regulating valve 20 is formed Valve processed-regulating valve combination (equalizing valve combination) is connected and presses liter step to continue equably to be boosted according to one-level and inversely defeated Enter gas, until the pressure that two corresponding pressure receives tower is equal, that is, it is 1.6MPa to form higher intermediate pressure.By This, pressure receives recovery of the pressure change (rise) in the pressure energy loss caused by the decompression of pressure output tower of tower, and correspondingly Pre- suction-operated has been further functioned as, has been prepared subsequently to travel further into formal adsorption step；

G, fill eventually：Complete one-level press the pressure of the adsorption tower 2 after liter step to be in intermediate pressure, i.e. 1.6MPa, it is necessary to Further boost to adsorptive pressure 2.4MPa, from the escape pipe 4 of the adsorption tower (filling tower eventually), via fill pipe 5 eventually, fill valve 11 eventually and Sequence valve-regulating valve that regulating valve 19 is formed is filled eventually combines reverse introducing portion fluid phase gas (product gas) to rise The high pressure tower that fills eventually prepares adsorption step to adsorptive pressure 2.4MPa.Now, the inlet and outlet boundary condition of tower cover half really is filled eventually Formula uses mechanical designated mode, and is combined with the sequence valve-regulating valve filled eventually on pipe 6 and carry out coordinated signals.Complete Into after filling step eventually, thus the cyclic process of an absorption-desorption of pressure-variable adsorption terminates, into a new circulate operation week Phase.

It should be noted that the end in the present embodiment fill valve 11, one-level equalizing valve 12, two level equalizing valve 13, release valve 14, Flushing valve 15, inverse put valve 16, air outlet valve 17, intake valve 18 etc. use common programme-control valve；And eventually fill regulating valve 19, Press regulating valve 20, use unidirectional regulating valve 22 along putting regulating valve 21, inverse put regulating valve.

The present embodiment less pressure number (2 times), less adsorption tower number (5), less valve quantity (44 It is individual), along put and it is secondary pressure etc. pressure change greatly the step of in can avoid causing gas flow rate because pressure change is larger Valve, pipeline, adsorbent etc. are caused caused by changing greatly it is serious wash away, realize that device is stable safely and efficiently to be transported OK, and reach traditional PSA and need at least more than 6 towers, press number (more than 3 times), the production that can be only achieved of valve quantity (48) Product purity and yield.

Embodiment 2

As shown in Fig. 2 in a kind of circulate operation described in embodiment 1 pressure change coordinated signals pressure swing absorption process On the basis of further optimize, described pressure is 2.4MPa, temperature is normal temperature hydrogeneous (50~60%H2) unstripped gas produces Fluctuation, i.e. under temperature and other conditions are constant, raw gas pressure produces the fluctuation more than 5% and rises to 2.6MPa, by 5 In pressure-variable adsorption (PSA) adsorption and desorption circulate operation system that adsorption tower 2 is formed, the operating pressure change of each of which step It is that the boundary condition of the autonomous judgement imported and exported by each adsorption tower determines pattern (doublet expression) and corresponding each adsorption tower Sequence valve-regulating valve integrated mode carries out coordinated signals to realize on the connected pipeline of inlet and outlet, wherein, it is equal in one-level The intermediate pressure value that pressure, two level are pressed remains within 1.6MPa, 0.2MPa level.The present embodiment causes unstripped gas to fluctuate operating mode Under, it still can guarantee that device is stable and safely and efficiently run, and the level of embodiment 1 can be reached.

Embodiment 3

As shown in figure 3, in a kind of circulate operation described in embodiment 1 pressure change coordinated signals pressure swing absorption process On the basis of further optimize, described pressure-variable adsorption (PSA) adsorption and desorption circulate operation being made up of 5 adsorption towers 2 In system, each adsorption tower 2 imports and exports sequence valve on connected pipeline-regulating valve combination, and it is a programme-control One regulating valve of series connection behind valve, forms and corresponds integrated mode.The purpose of the present embodiment, can greatly increase and be The stability of system (device), more adapt to the fluctuation of pressure by a relatively large margin during unstripped gas and circulate operation so that device is transported Row at least even more than reaches the level of embodiment 1.

Embodiment 4

As shown in figure 4, in a kind of circulate operation described in embodiment 1 pressure change coordinated signals pressure swing absorption process On the basis of further optimize, the adsorption tower 2 after described completion inverse put (c), by set up vacuum step (e) come instead of punching Wash step (e).In vacuum step (e) by vacuum tube 23, vacuum valve 24, vacuum breaker 25 and vavuum pump 26 coordinate with It is reverse to extract the impurity gas being still trapped in adsorption tower 2 on adsorbent and in dead space out and regulation evacuates to adsorption tower 2 Body, so as to further complete the regenerative process of whole adsorbent, inhaled so that the tower (vacuum column) (2) carries out pressure-variable adsorption next time Two level in the circulate operation of attached-desorption presses liter (f2), an one-level to press liter (f1) and fill (g) step eventually.Now, vacuum column The pattern that inlet boundary condition determines judges (doublet expression) using autonomous, and export boundary condition determines that pattern is mechanical finger Fixed (single dotted line expression).Gas caused by evacuation is discharged as stripping gas.The stripping gas of discharge or directly emptying, or send to up to standard Fuel pipe network, or flare system.The implementation of the present embodiment, it can at least reach the level of embodiment 1.

Embodiment 5

As shown in figure 5, in a kind of circulate operation described in embodiment 1,4 pressure change coordinated signals pressure-variable adsorption side Further optimize on the basis of method, hydrogeneous (50~60%H2) unstripped gas that described pressure is 2.4MPa, temperature is normal temperature, change For pressure 2.4MPa, temperature are normal temperature carbon containing two and (C2+) component 30%, H2 50%, methane (CH4) 15% above, its The oil refinery dry gas that his component is 5%.Described pressure-variable adsorption (PSA) adsorption and desorption being made up of 5 adsorption towers 2 circulation behaviour Make in system, product gas is the stripping gas formed from inverse put step, the product gas as recovery C2+.And pushed up from adsorption tower 2 The fluid phase gas of portion's outflow, by escape pipe 4, air outlet valve 17 as absorption waste gas discharge.After adsorption step (a) terminates Before the equal voltage drop step of one-level (b1) starts, displacement step (a ') is set up, i.e. the stripping gas from normal pressure, add by compressor 31 Adsorptive pressure 2.4MPa is depressed into, a part exports as C2+ product gas, substitution gas of the part as displacement step (a '). Substitution gas are from adsorption tower (displacement tower) entrance point in displacement step, by the displacement pipe 27 of the tower and by displacement valve 28 Sequence valve-the regulating valve formed with displacement exhaust gas valve 30, which combines, forward enters adsorption tower 2；From going out for the top of adsorption tower 2 Mouthful, combine outflow with sequence valve-regulating valve that pressure regulating valve 20 is formed by escape pipe 4 and by air outlet valve 17 and put Waste gas is changed, the displacement waste gas, a part is by displacement flue gas leading 29, and by air outlet valve 17 and replaces what exhaust gas valve 30 was formed Sequence valve-regulating valve combination returns to unstripped gas, and a part is directly discharged as discharge gas.Substitution gas enter in displacement tower During line replacement step, the impurity in dead space in the adsorbing contaminant component (component such as H2, CH4) and adsorption tower of eutectoid content is displaced Component.The inlet and outlet boundary condition of displacement tower determines that pattern judges (doublet expression) using autonomous, and coupled disengaging Sequence valve-regulating valve combination coordinated signals on mouth, to ensure substitution gas requirement, time swap and displacement pressure It is stable.

Embodiment 6

As shown in fig. 6, in a kind of circulate operation described in embodiment 1 pressure change coordinated signals pressure swing absorption process On the basis of further optimize, described pressure is 3.5MPa, temperature for normal temperature hydrogeneous unstripped gas (density of hydrogen is more than 50~ 60%), into one group of pressure-variable adsorption (PSA) adsorption and desorption circulate operation system being made up of 6 adsorption towers 2, Wherein, 1 adsorption tower 2 is in adsorption step all the time, and it is equal that remaining 5 tower is respectively at the equal pressure drop of one-level, the equal pressure drop of two level, three-level The desorption procedures such as pressure drop, inverse put, flushing, one-level are pressed liter, two level is pressed liter, three-level is pressed liter, is filled eventually.It is equal in desorption process It is 3 times to press number, and the intermediate pressure that one-level is pressed is 1.8MPa, and the intermediate pressure that two level is pressed is 0.9MPa, what three-level was pressed Intermediate pressure is 0.2MPa.The boundary condition that adsorption tower 2 in pressure equalizing three times is imported and exported determines pattern using machinery Designated mode, and the sequence valve-regulating valve connected with the inlet and outlet of adsorption tower 2 combines and carries out coordinated signals, i.e. according to two The instant pressure in target affinity tower pressed is as evidence is referred to, and by adjusting the Push And Release and aperture of valve combination, joins immediately Dynamic control gas flow rate and target affinity tower are interior and the pressure trend of inlet and outlet, the pressure for thereby increasing pressure step become The fault-tolerance of change, prevent from pressing three times and other step pressure changes it is larger cause gas flow rate change greatly caused by valve The problem of door, pipeline, adsorbent etc. cause seriously to wash away, enable to the more stable safe and efficient operation of device.

This example demonstrates that：Valve 11, one-level equalizing valve 12, two level equalizing valve 13, three-level equalizing valve 34, air outlet valve are filled eventually 17th, intake valve 18 uses common programme-control valve；Inverse put valve 16, regulating valve 19 is filled eventually, presses regulating valve 20 using single To regulating valve.

The present embodiment is that reaching traditional PSA needs at least 8 using the PSA techniques of 6 adsorption towers, the flushing regeneration pressed for 3 times More than tower, press technique more than 3 times, suitable product purity, yield and the yield that can be only achieved, reduce adsorption tower, valve, The equipment investment such as pipeline quantity and floor space, improve the stable security of PSA plant runnings.

Embodiment 7

As shown in fig. 7, in a kind of circulate operation described in embodiment 1 pressure change coordinated signals pressure swing absorption process On the basis of further optimize, described pressure is 1.6MPa, temperature for normal temperature hydrogeneous unstripped gas (71%H2,25%CO2, 4%CO), it is made up of into described 4 adsorption towers 2 of one group or one section (1#) 6 adsorption towers 2 and another group or one section (2#) Two groups of (section) pressure-variable adsorption (PSA) adsorption and desorption circulate operation systems, wherein, described one section of (1#) PSA adsorption and desorption Continuous cyclic process includes 1# absorption, the equal pressure drop of 1# one-levels, the equal pressure drop of 1# two levels, 1# inverse puts, 1# evacuations, 1# two levels are pressed liter, 1# one-levels are boosted, 1# fills step eventually；The continuous cyclic process of described two sections of (2#) PSA adsorption and desorptions includes 2# absorption, 2# mono- Level pressure drop, the equal pressure drop of 2# two levels, 2# inverse puts, 2# two levels are pressed liter, 2# one-levels are boosted, 2# fills step eventually.Each section (group) PSA system by each adsorption tower 2 import and export boundary condition determine pattern with it is corresponding import and export pipeline on sequence valve- The linkage of regulating valve combination, and intersect linkage between one section of (1#) PSA system and two sections of (2#) PSA systems, realize overall PSA The stabilization of device safely and efficiently runs control.Specific segmentation is described as follows：

1,1#PSA system

A, 1# is adsorbed：By composition be hydrogen content be 71%, CO2 contents are 25%, CO contents are 4%, pressure is 1.6MPa unstripped gas, one section (1#) is sent into by 6 through one section of (1#) air inlet pipe, 1, one section of (1#) air intake branch 3, intake valve K0101 In any 2 one section of (1#) adsorption towers 2 for the PSA system that individual adsorption tower 2 forms, filling hydrogen is dense in one section of (1#) adsorption tower 2 Contracting adsorbent, using the different adsorption capacities to different component, the CO2 in unstripped gas is adsorbed, effective gas composition hydrogen and few Other foreign gases (CO and CO2) are measured as intermediate gas then from one section (1#) at 2 corresponding tops of one section of (1#) adsorption tower 2 Escape pipe 4 exports, and now the content of hydrogen is more than 90%；And it is connected and is closed with the control valve of remaining 4 tower or other valves Close.Intake valve, the air outlet valve of connection adsorption tower inlet and outlet are pneumatic shutoff valve, one kind as sequence valve.This In step, the inlet and outlet boundary condition of adsorption tower determines that pattern is specified (single dotted line expression) for machinery, wherein, inlet pressure is 1.6MPa, outlet pressure are to disregard close to 1.6MPa, the one section of bed resistance of (1#) adsorption tower 2 drop；

The equal pressure drop of b1,1# one-level：Unstripped gas passes through after the completion of 220 seconds adsorption steps in one section of (1#) adsorption tower 2, one section The inlet and outlet boundary condition of (1#) adsorption tower 2 determines that pattern still specifies (single dotted line expression) using the machinery of adsorption step.This When, program control that the escape pipe 4 of one section of (1#) adsorption tower 2 is formed via one section of (1#) one-level balance pipe 6, equalizing valve K0106 Valve processed-regulating valve combination is connected with the feed end of other any 1 or two one section of (1#) adsorption tower 2, and one with being connected section The boundary condition that (1#) each adsorption tower 2 is imported and exported determines that pattern coordinated signals carry out equably decompression discharge gas, until its 2 pressure of two or more corresponding one section of (1#) adsorption tower are equal.Wherein, it is equal according to one section of (1#) one-level of two or more progress Instant pressure (mechanical designated value, single dotted line represent) in one section of (1#) target affinity tower 2 of pressure is used as reference frame, passes through tune In the target affinity tower 2 of the Push And Release and aperture of whole valve combination, instant coordinated signals gas flow rate and this section and inlet and outlet Pressure trend so that one section of (1#) target affinity tower 2 that one section of (1#) one-level of two or more progress is pressed is in regulation It is interior to form equal intermediate pressure；

The equal pressure drop of b2,1# two level：Complete the inlet and outlet side of one section of (1#) adsorption tower 2 of one section of equal voltage drop step of (1#) one-level Boundary's condition determines that pattern still uses mechanical designated mode (single dotted line expression).Now, the escape pipe 4 of one section of (1#) adsorption tower 2 It is equal through one section of (1#) two level balance pipe 7 and other any 2 receiving completed vacuum step and be in minimum low-pressure Pressure one section of (1#) adsorption tower 2 feed end by by one section of (1#) two level balance pipe 7 through one section of (1#) two level equalizing valve K0107 The sequence valve formed-regulating valve combination (equalizing valve combination) it is connected and according to one section of (1#) one-level press step continue into Row decompression discharge gas, one section of equal voltage drop step of (1#) two level equably carry out (slow equal) decompression discharge gas, prevent one section The equal pressure drop amplitude of (1#) two level moment it is excessive cause change in flow amplitude it is excessive caused by wash away, and until its pressure be reduced to The value of setting；

C, 1# inverse puts：Completing one section of (1#) two level presses the inside of one section of (1#) adsorption tower 2 after step to carry pressure (two level 0.05~the 0.1MPa of designated value reached after pressing), then adjusted via one section of (1#) inverse put pipe 10, inverse put valve K0104, inverse put The sequence valve of valve K0110 compositions-regulating valve combination (inverse put valve) equably carries out inverse along the opposite direction of unstripped gas flowing Gas (stripping gas) is discharged to decompression, further reduces by one section of pressure of (1#) adsorption tower 2.Now, one section of (1#) inverse put tower Inlet boundary condition determines that pattern is inverse by pressing the outlet machinery designated mode (single dotted line expression) of step to switch to one section (1#) Pattern (doublet expression) (is in harmony) in the autonomous judgement for putting the determination of tower inlet boundary condition certainly, and with sequence valve-regulation valve group Close (inverse put valve) and carry out coordinated signals, wherein, autonomous determinating mode (doublet expression) is according to stream in one section of (1#) inverse put pipe 10 Gas flow rate distribution is carried out from main modulation in rate of flow of fluid and one section of (1#) inverse put tower, and then maintains inverse put in one section of (1#) inverse put tower The steady state operation of process, until pressure and flow speed value specified by one section of (1#) inverse put tower export boundary condition, complete adsorbent Regeneration.It is used during pressure step that the export boundary condition of one section of (1#) inverse put tower determines that pattern still uses the tower to carry out Inlet boundary condition machinery designated mode (single dotted line expression).The reverse gas of inverse put step discharge, wherein H2 contents are about 5%, As stripping gas, reach qualified emission standard straight and run in sky, or fuel pipe network or flare system are admitted to as fuel gas；

D, evacuate：One section of (1#) adsorption tower 2 after inverse put step is completed, by vavuum pump 26, evacuation valve K0103 to the tower Evacuated, it is reverse to extract the foreign gas being still trapped in adsorption tower on adsorbent and in dead space out, and then through one section Inversely gas is discharged in decompression to (1#) inverse put pipe 10, so as to complete the regenerative process of whole adsorbent, so as to one section of (1#) adsorption tower (vacuum column) carries out the circulate operation of pressure-variable adsorption absorption-desorption next time.Now, the inlet boundary bar of one section of (1#) vacuum column The pattern that part determines is judged using autonomous, and export boundary condition determines that pattern is specified for machinery.H2 in gas caused by evacuation Content about 5%, discharged as stripping gas, or reach discharge index and directly empty, or be sent into fuel pipe network, or flare system；

E, 1# two levels press liter：Complete one section of (1#) inverse put and one section of (1#) adsorption tower 2 after vacuum step one section (1#) escape pipe 4 is adjusted via one section of (1#) one-level balance pipe 6, equalizing valve K0106, two level balance pipe 7, equalizing valve K0107, pressure The sequence valve that section valve K0109 is formed-regulating valve combination (equalizing valve) and the boundary condition of one section of (1#) tower inlet and outlet Determine that pattern carries out coordinated signals, and the gas institute for being inversely uniformly introduced the equal pressure drop tower discharge of corresponding one section of (1#) two level is defeated The pressure gone out, until the pressure of two towers or two-by-two tower is equal.Wherein, inversely equably carry out one section of (1#) two level and press a liter step Suddenly, sequence valve-regulating valve combination is boosted and inputs the import of gas process and the tower and the outlet of pressure output tower The mechanical designated mode (single dotted line expression) of boundary condition is connected, so that adjust automatically is with determining that one section of (1#) two level presses liter Press the pressure of tower to rise the time and finally with pressure output tower, i.e. the pressure of the equal pressure drop tower of two level is equal, and during pressure rises, It can prevent from causing gas flow rate change excessive and cause in valve, pipeline and adsorption tower 2 moment boosting amplitude is excessive It is adsorbent bed to cause serious wash away.Thus, pressure receives tower, i.e. two level presses the pressure change (rise) of liter tower in pressure The recovery of tower, i.e. pressure energy loss caused by the equal pressure drop tower decompression of two level is exported, and correspondingly serves pre- suction-operated；

G, 1# one-levels press liter：Complete the inlet and outlet boundary condition that one-level presses one section of (1#) adsorption tower 2 of liter step Determine that pattern still uses mechanical designated mode (single dotted line expression).Now, one section of escape pipe 4 of (1#) adsorption tower 2 is through one section (1#) one-level balance pipe 6 with other any 1 or two one section (1#) for carrying out the equal voltage drop step of one-level and pressure output The port of export of the equal pressure drop tower of one-level passes through by one section of (1#) one-level balance pipe 6, equalizing valve K0106, two level balance pipe 7, equalizing valve K0107, sequence valve-regulating valve combination (equalizing valve combination) that pressure regulating valve K0109 is formed are connected and according to one-level Pressure rises step and continues equably to be boosted and inversely input gas, until two or it is individual two-by-two corresponding to one-level press tower Pressure it is equal.Thus, one section of (1#) one-level presses the pressure change (rise) of liter tower in one section (1#) pressure drop tower decompression institute The recovery of caused pressure energy loss, and pre- suction-operated has correspondingly been further functioned as, subsequently to travel further into formal suction Attached step prepares；

H, 1# fills eventually：Completing one section of (1#) one-level presses the pressure of one section of (1#) adsorption tower 2 after liter step to be in centre Pressure is, it is necessary to further boost to adsorptive pressure 1.6MPa, from one section of (1#) escape pipe of one section of (1#) adsorption tower (filling tower eventually) 4, pipe 6 is filled eventually via one section (1#), is filled valve K0105 eventually, is filled sequence valve-regulation valve group that regulating valve K0108 formed eventually Close reverse introducing portion fluid phase gas (product gas) and fill pressure tower eventually to adsorptive pressure 1.6MPa to raise one section (1#), it is accurate Standby adsorption step.Now, one section (1#) fills the inlet and outlet boundary condition of tower mould-fixed uses mechanical designated mode really eventually, and Combine with the sequence valve-regulating valve filled eventually on pipe 6 at one section (1#) and (fill valve eventually) and carry out coordinated signals.Complete one section After (1#) fills step eventually, thus the cyclic process of an absorption-desorption of one section of (1#) pressure-variable adsorption terminates, and is followed into new one The ring operation cycle.

2,2#PSA systems

A, 2# is adsorbed：Certain time interval is pressed from the intermediate gas of the one section of top of (1#) adsorption tower 2 output, is divided different Period, gradually enter in order through two sections of 1, two section of (2#) air inlet pipe, 3, two sections of (2#) air intake branch (2#) intake valve K0201 by 4 In any 1 adsorption tower 2 in two sections of (2#) PSA systems that individual adsorption tower 2 forms, filling hydrogen in two sections of (2#) adsorption towers 2 Adsorbent is purified, using the different adsorption capacities to different component, by the impurity absorption such as remaining methane in intermediate gas, product hydrogen Two sections of (2#) escape pipes 4 of gas then through two sections of tops of (2#) adsorption tower 2 export, and send out product hydrogen through product tracheae 35 and fill Put, now the content of hydrogen is more than 99.9%.And be associated with remaining 3 tower in two sections of (2#) PSA systems control valve or Other valves are turned off.In this step, the inlet and outlet boundary condition of two sections of (2#) adsorption towers 2 determines that pattern specifies (list for machinery Dotted line represents), wherein, inlet pressure 1.6MPa, outlet pressure is close to 1.6MPa, two sections of bed resistances of (2#) adsorption tower 2 Drop is disregarded；

The equal pressure drop of b1,2# one-level：After the completion of intermediate gas was adsorbed in two sections of (2#) adsorption towers 2 by 280 seconds, two sections The inlet and outlet boundary condition of (1#) adsorption tower 2 determines that pattern still specifies (single dotted line expression) using the machinery of adsorption step.This When, the escape pipe 4 of two sections of (2#) adsorption towers 2 via two sections of (2#) one-level balance pipes 6, equalizing valve K0206, press regulating valve The sequence valve that K0208, two level balance pipe 7, two level equalizing valve K0207 are formed-regulating valve combines and other any 1 two The feed end of section (2#) adsorption tower 2 is connected, and the boundary condition that two with being connected sections (2#) each adsorption tower 2 is imported and exported determines mould Formula coordinated signals carry out equably decompression discharge gas, until two 2 pressure of corresponding two sections of (2#) adsorption towers is equal.Its In, according to two instant pressure carried out in two sections of (2#) target affinity towers 2 pressing of two sections of (2#) one-levels (mechanical designated value, Single dotted line represents) be used as reference frame, by adjusting the Push And Release and aperture of valve combination, instant coordinated signals gas flow rate and In this section of target affinity tower 2 and inlet and outlet pressure trend so that two carry out that two sections of (2#) one-levels are pressed two sections (2#) target affinity tower 2 forms equal intermediate pressure at the appointed time；

The equal pressure drop of b2,2# two level：Complete the inlet and outlet side of two sections of (2#) adsorption towers 2 of two sections of equal voltage drop steps of (2#) one-level Boundary's condition determines that pattern still uses mechanical designated mode (single dotted line expression).Now, the escape pipe 4 of two sections of (2#) adsorption towers 2 It is to be pressed through two sections of (2#) two level balance pipes 7 and other any 1 receiving completed inverse put step and be in minimum low-pressure Two sections of (2#) adsorption towers 2 feed end by by two sections of (2#) one-level balance pipes 6, equalizing valve K0206, press regulating valve The sequence valve that K0208, two level balance pipe 7, two level equalizing valve K0207 are formed-regulating valve combination (equalizing valve combination) phase Even and according to one section of (1#) one-level step is pressed to continue decompression discharge gas, two sections of equal voltage drop steps of (2#) two level are equably (slow equal) decompression discharge gas is carried out, prevents two sections of equal pressure drop amplitudes of (2#) two level from excessive causing change in flow amplitude mistake in moment Washing away caused by big, and until its pressure is reduced to the value of setting；

C, 2# inverse puts：Completing two sections of (2#) two levels presses the inside of two sections of (2#) adsorption towers 2 after step to carry pressure, then Via sequence valve-regulating valve combination of two sections of (2#) inverse put pipes 10, inverse put valve K0203, inverse put regulating valve K0209 compositions (inverse put valve) is equably inversely depressurized along the opposite direction of unstripped gas flowing and discharges gas (stripping gas), is further reduced Two sections of pressure of (2#) adsorption tower 2.Now, the inlet boundary condition of two sections of (2#) inverse put towers determines pattern by pressing the outlet of step Mechanical designated mode (single dotted line expression) switches to the autonomous judgement (being in harmony certainly) that two sections of (2#) inverse put tower inlet boundary conditions determine Pattern (doublet expression), and combine (inverse put valve) with sequence valve-regulating valve and carry out coordinated signals, wherein, it is autonomous to judge Pattern (doublet expression) is according to gas flow rate distribution in gas flow rate in two sections of (2#) inverse put pipes 10 and two sections of (2#) inverse put towers Carry out from main modulation, and then maintain the steady state operation of inverse put process in two sections of (2#) inverse put towers, until two sections of (1#) inverse put towers go out 100~500kPa of pressure specified by mouth boundary condition, completes the regeneration of adsorbent.The outlet border bar of two sections of (2#) inverse put towers Part determines used inlet boundary condition machinery designated mode (single dotted line table when pattern still carries out pressing step using the tower Show).The reverse gas of inverse put step discharge reaches qualified emission standard as stripping gas, and through two sections of (2#) inverse put pipes 10 Emptying；

D1,2# two level press liter：Complete two sections of (2#) outlets of two sections of (1#) adsorption towers 2 after two sections of (2#) inverse put steps Pipe 4 is via two sections of (2#) two level balance pipes 7, equalizing valve K0207, pressure regulating valve K0208, one-level balance pipe 6, one-level equalizing valve The sequence valve that K0206 is formed-regulating valve combination (equalizing valve) and the boundary condition of two sections of (2#) tower inlet and outlet determine Pattern carries out coordinated signals, and is inversely uniformly introduced what the gas that the equal pressure drop tower of corresponding two sections of (2#) two levels is discharged was exported Pressure, until the pressure of two towers is equal.Wherein, two sections of (2#) two levels are inversely equably carried out and presses a liter step, sequence valve- Regulating valve combination is boosted and inputs the machinery of the import of gas process and the tower and the export boundary condition of pressure output tower Designated mode (single dotted line expression) is connected, when being risen so as to the pressure of two sections of (2#) two level boost pressure towers of adjust automatically and determination Between and finally with pressure output tower, i.e. the pressure of the equal pressure drop tower of two level is equal, and pressure rise during, can prevent in moment Boosting amplitude is excessive to be caused gas flow rate change excessive and causes to cause adsorbent bed in valve, pipeline and adsorption tower 2 Serious washes away.Thus, pressure receives tower, i.e. two level presses the pressure change (rise) of liter tower in pressure output tower, i.e. two level The recovery of pressure energy loss caused by equal pressure drop tower decompression, and correspondingly serve pre- suction-operated.

D2,2# one-level press liter：Complete the inlet and outlet boundary condition that two level presses two sections of (2#) adsorption towers 2 of liter step Determine that pattern still uses mechanical designated mode (single dotted line expression).Now, two sections of escape pipes 4 of (2#) adsorption tower 2 are through two sections (2#) one-level balance pipe 6 is carrying out the equal voltage drop step of one-level with other any 1 and two sections of (2#) one-levels of pressure output are equal The port of export of pressure drop tower passes through by two sections of (2#) one-level balance pipes 6, one-level equalizing valve K0206, pressure regulating valve K0208, two level The sequence valve that balance pipe 7, two level equalizing valve K0207 are formed-regulating valve combination (equalizing valve combination) is connected and according to one Level pressure rises step and continues equably to be boosted and inversely input gas, until two corresponding one-level presses the pressure of tower It is equal.Thus, two sections of (2#) one-levels press the pressure change (rise) of liter tower caused by two sections (2#) the decompression of pressure drop tower The recovery of pressure energy loss, and pre- suction-operated has correspondingly been further functioned as, subsequently to travel further into formal adsorption step Prepare；

E, 2# fills eventually：Completing two sections of (2#) one-levels presses the pressure of two sections of (2#) adsorption towers 2 after liter step to be in centre Pressure goes out from two sections (2#) of two sections of (2#) adsorption towers (filling tower eventually) (12), it is necessary to further boost to adsorptive pressure 1.6MPa Tracheae 4, regulating valve K0204 is filled eventually via two sections (2#), pipe 5 is filled eventually, fills sequence valve-regulation that valve K0205 formed eventually Valve group closes reverse introducing portion fluid phase gas (product gas) and fills pressure tower eventually to adsorptive pressure to raise two sections (2#) 1.6MPa, prepare adsorption step.Now, two sections (2#) fill the inlet and outlet boundary condition of tower mould-fixed use mechanical finger really eventually Mould-fixed, and sequence valve-regulating valve with being filled eventually on pipe 5 at two sections (2#) combines and (fills valve eventually) and carries out coordinated signals. After completion two sections (2#) fills step eventually, thus the cyclic process of an absorption-desorption of two sections of (2#) pressure-variable adsorptions terminates, and enters A new circulate operation cycle.

Embodiment 8

The transformation of pressure change coordinated signals is inhaled in a kind of circulate operation described in embodiment 1~7 any one example Further optimize on the basis of subsidiary formula method, during described pressure-variable adsorption adsorption and desorption circulate operation along put, equal pressure drop, Inverse put, rinse/vacuumize, pressure rises step, inverse put valve, pressure (drop/liter) valve, along putting/rinse/vacuum pumping valve adjusted using band The sequence valve for saving function is realized.

It is embodiments of the invention as described above.The present invention is not limited to the above-described embodiments, anyone should learn that The structure change made under the enlightenment of the present invention, the technical schemes that are same or similar to the present invention, each fall within this Within the protection domain of invention.

Claims (6)

1. A kind of 1. pressure swing absorption process of pressure change coordinated signals in circulate operation, it is characterised in that the pressure swing absorption process By being simulated to the adsorption and desorption circulate operation process of pressure swing adsorption system, by the border of adsorption tower inlet and outlet in simulation Condition determines mechanical designated mode, autonomous determinating mode and the autonomous integrated mode of machinery, and the pressure swing adsorption system is by least Two adsorption tower groups into one or more groups of absorption tower sections composition；By the control model of determination and sequence valve-regulation valve group The coordinated signals of conjunction, according to the instant pressure in two or more target affinity towers as reference frame, by adjusting valve The Push And Release and aperture of combination, in instant coordinated signals gas flow rate and target affinity tower and inlet and outlet pressure trend.
2. 2. the pressure swing absorption process of pressure change coordinated signals, its feature exist in a kind of circulate operation as claimed in claim 1 In the pressure swing absorption process includes following process：

   (1) adsorb：Unstripped gas with certain pressure through air inlet pipe, air intake branch be sent into any 1 of pressure swing adsorption system or Multiple absorption tower bottoms, the interior filling adsorbent of adsorption tower, by the suction in unstripped gas under the adsorption operations pressure of raw gas pressure Attached matter component absorption, non-adsorbed component are then equal to adsorption operations from the escape pipe output at the top of corresponding adsorption tower, its pressure Pressure；Wherein, the determination of the inlet and outlet boundary condition of the adsorption tower in adsorption step, using mechanical designated mode, setting is inhaled Attached tower inlet and outlet pressure is equal or overcomes the inlet and outlet pressure of bed resistance drop, now, adsorption tower and solution in adsorption step It is drawn through the sequence valve-regulating valve combination being connected between the adsorption tower of journey to be closed, the non-adsorbed component gas in part End for another adsorption tower fills；

   (2) equal pressure drop：Unstrpped gas is passed through after the completion of absorption in adsorption tower, and above-mentioned steps participate in the disengaging of the adsorption tower of absorption Mouth boundary condition determines the adsorption tower inlet and outlet boundary condition that pattern is specified using above-mentioned adsorption step machinery, now, in pressure The escape pipe of the adsorption tower of power output state or adsorption tower in equal pressure drop state is through balance pipe and other any 1 or more The pressure that the individual receiving completed rinsing step and be in minimum pressure is pressed receives the top of adsorption tower or bottom passes through program Control valve-regulating valve combination, which is connected, carries out decompression discharge gas, until two or more corresponding pressure receive the pressure of tower It is equal, that is, intermediate pressure is formed, wherein, the combination of sequence valve-regulating valve is depressurized and to discharge gas process defeated with pressure Go out the outlet of tower and the mechanical designated mode of inlet boundary condition that pressure receives tower is connected, so that adjust automatically is pressed with determining The equal pressure drop time of power output tower and equal voltage drop step are equably carried out, and prevent equal pressure drop amplitude from excessive causing flow velocity to become in moment Washing away caused by change amplitude is excessive, and the pressure for finally receiving tower with pressure is equal；

   (3) it is suitable to put：Complete to press and the pressure output tower in higher intermediate pressure power continues the boundary condition specified according to machinery Determination mode, forward bled off pressure further along gas flow direction, and equably bleed off pressure relatively low intermediate pressure, prevent from bleeding off pressure Journey is excessive and causes the excessive caused washing programme control valve of change in flow-regulating valve combination, now, continues pressure output tower Escape pipe be to combine one or more corresponding with other through sequence valve-regulating valve to be in the adsorption tower of rinsing step Top is connected, decompression discharge gas, until pressure reaches along the mechanical designated value for putting tower export boundary condition, wherein, program control Valve processed-regulating valve combination is depressurized and discharges gas process and the suitable machine for putting the outlet of tower and the inlet boundary condition of purge column Tool designated mode is connected, so as to adjust automatically with determine pressure output tower along putting the time and final outlet pressure is specified Value；

   (4) inverse put：Complete along stride it is rapid after adsorption tower inside carry pressure, then through one section of inverse put pipe, by sequence valve- Regulating valve combination is inversely depressurized along the opposite direction of unstripped gas flowing and discharges stripping gas, further reduces adsorption tower pressure Power, now, the inlet boundary condition of inverse put tower determine pattern by switching to inverse put tower along the outlet machinery designated mode for strideing rapid The autonomous determinating mode that inlet boundary condition determines, and combine inverse put valve with sequence valve-regulating valve and carry out coordinated signals, its In, autonomous determinating mode is carried out from main modulation, Jin Erwei according to inverse put tube fluid flow velocity and the distribution of inverse put tower inner fluid speed The steady state operation of inverse put process in inverse put tower is held, until including pressure, flow speed value specified by inverse put tower export boundary condition；It is inverse The export boundary condition for putting tower determines that pattern is still carried out along used inlet boundary condition machinery when strideing rapid using the tower Designated mode；

   (5) rinse：The escape pipe for completing the adsorption tower after inverse put step is forward or reverse to be introduced through flushing valve from entering Row is deflated along rapid adsorption tower of strideing is suitable, or from product gas, the adsorption tower for being in minimum to pressure in circulate operation is carried out Rinse so that the adsorbent reactivation loaded in adsorption tower is complete.Now, the inlet and outlet boundary condition of purge column determines that pattern is adopted With mechanical designated mode, and combined with sequence valve-regulating valve and carry out coordinated signals, until purge column export boundary condition institute The pressure or flow speed value specified, from the flushed gas of purge column outlet outflow, discharged as stripping gas, or return to original Material gas further reclaims active principle；

   (6) evacuate：The adsorption tower after inverse put and rinsing step is completed, adsorption tower is evacuated by vavuum pump, it is reverse to extract out Still the foreign gas on adsorbent and in dead space in adsorption tower is trapped in, so as to complete the regenerative process of whole adsorbent, So that the tower carries out the circulate operation of pressure-variable adsorption absorption-desorption next time；Now, the inlet boundary condition of vacuum column determines Pattern is judged using autonomous, and export boundary condition determines that pattern is specified for machinery；Gas caused by evacuation is arranged as stripping gas Go out, without sequence valve-regulating valve combination on discharge pipe, also do not determine that pattern linkage is controlled with vacuum column inlet and outlet boundary condition System；

   (7) pressure rises：The pressure for completing the adsorption tower after evacuation step is in pressure minimum stage in pressure swing adsorption cycles operation, Now, the adsorption tower air inlet pipe through balance pipe and other it is any one or more carrying out equal voltage drop step adsorption tower top End or bottom are connected and boosted to input gas by sequence valve-regulating valve combination, until two or more are corresponding Pressure output tower pressure it is equal, that is, form intermediate pressure or adsorptive pressure, wherein, sequence valve-regulating valve combine into Row boosts and inputs gas process and receive the mechanical finger cover half of the import of tower and the export boundary condition of pressure output tower with pressure Formula is connected, and so that adjust automatically is with determining that pressure receives the pressure liter time of tower and pressure liter step is equably carried out, prevents Press increasing degree degree moment it is excessive cause change in flow amplitude it is excessive caused by wash away, and the finally pressure with pressure output tower It is equal；

   (8) fill eventually：The pressure for completing the adsorption tower after pressure liter step is in intermediate pressure, it is necessary to further boost to adsorption pressure Power, from the escape pipe of the adsorption tower, fill tower eventually through filling the reverse introducing portion fluid phase gas of pipe or unstrpped gas eventually to raise Pressure prepares adsorption step to adsorptive pressure.Now, filling the inlet and outlet boundary condition of tower eventually, mould-fixed uses mechanical finger really Mould-fixed, and sequence valve-regulating valve with filling eventually on pipe combines and carries out coordinated signals；After completing to fill step eventually, transformation Thus the cyclic process of one absorption-desorption of absorption terminates, into a new circulate operation cycle.
3. 3. the pressure swing absorption process of pressure change coordinated signals, its feature exist in a kind of circulate operation as claimed in claim 2 In：Each adsorption tower imports and exports sequence valve on connected pipeline-regulating valve combination, including one between two adsorption towers One regulation of series connection between every two rows sequence valve between sequence valve series connection one regulating valve, or the multigroup adsorption tower of multitower Valve, or the sequence valve alternative program control valve with regulatory function, or equalizing valve use sequence valve-tune with release valve Valve group is saved to close, wherein, for valve using unidirectional or bidirectional modulation, its type is butterfly valve, stop valve, plug valve, ball valve, gate valve, pin One or more in type valve, diaphragm valve or other can play it is slow, it is voltage stabilizing, regulation flow and pressure, water conservancy diversion, anti-non-return The control valve or device of stream, shunting or overflow pressure relief effect.
4. 4. according to claim 1 in a kind of circulate operation pressure change coordinated signals pressure swing absorption process, its feature exists In in the pressure-variable adsorption adsorption and desorption circulate operation system, product gas is to come from inverse put or flushing or vacuum step institute The stripping gas of composition, increase before starting before equal voltage drop step starts after adsorption step terminates or along inverse put step after rapid terminate that stride If displacement step, i.e., displaced dead empty in the adsorbing contaminant component and adsorption tower of eutectoid content as substitution gas using product gas Between in impurity composition；Substitution gas forward enter adsorption tower from adsorption tower import, flow out displacement waste gas from adsorption column outlet, or Unstripped gas is returned to, or battery limit (BL) is discharged directly as waste gas.
5. 5. the pressure-variable adsorption side of pressure change coordinated signals in a kind of circulate operation according to claim 1-4 any one Method, it is characterised in that the unstripped gas is the pressure feed gas that pressure is less than 1.0MPa, its pressure or feed gas composition concentration with Other factors cause range of pressure fluctuations to be more than ± 10%, or are more than 1.0MPa mesohigh unstripped gas, its pressure for pressure Or feed gas composition concentration causes range of pressure fluctuations to be more than ± 5% with other factors, the change being made up of at least two adsorption tower In the adsorption and desorption circulate operation system for pressing adsorption system, the operating pressure change of each step is passed in and out by each adsorption tower Mouthful autonomous judgement boundary condition determine sequence valve on the pattern pipeline connected with corresponding each adsorption tower inlet and outlet- Regulating valve integrated mode carries out coordinated signals to realize.
6. 6. according to claim 5 in a kind of circulate operation pressure change coordinated signals pressure swing absorption process, its feature exists In, the adsorption tower in described pressure swing adsorption system, including one or more absorption for being filled with one or more sorbing materials Tower, the sorbing material are activated alumina, activated carbon, silica gel, molecular sieve and other loads, one kind of modified sorbing material It is or a variety of.