CN206304538U - From containing CO2Separating high-purity CO in unstripped gas2Device - Google Patents

Abstract

The utility model is related to from containing CO₂Separating high-purity CO in unstripped gas₂Device, it includes air inlet surge tank, the first pipeline, more than two adsorption towers, second pipe, the 3rd pipeline, the 4th pipeline, vavuum pump, poor CO₂Gas tank and CO₂Products pot；Each adsorption tower includes intake valve, air bleeding valve, the first valve and the second valve, and air inlet surge tank is connected with absorption tower bottom, and the top of adsorption tower passes through second pipe and poor CO₂Gas tank is connected, and the top of each adsorption tower is interconnected by the 3rd pipeline, bottom and vavuum pump and the CO of adsorption tower₂Products pot is connected.Device absorption tower height degree of the present utility model is low, cycle period is short, floor space is small, be moved easily and can realize remote control, is industrial production purification CO₂The cost-effective, economic worth that generation is huge.

Description

From containing CO2Separating high-purity CO in unstripped gas2Device

Technical field

The utility model is related to carbon dioxide separation field, and specifically a kind of one-part form is using Vacuum Pressure Swing Adsorption from containing CO₂Separating high-purity CO in unstripped gas₂Device.

Background technology

Carbon dioxide（CO₂）It is main greenhouse gases, climate change and global warming can be caused.The world is currently under To the low-carbon emission transition period, China is releasing or is releasing carbon tax/carbon transaction plan together with many countries, to reduce two Oxidation carbon emission, greenhouse gas emission and raising energy efficiency.Therefore, titanium dioxide is recycled from various industrial exhaust gas Carbon has huge environmental benefit and economic interests, meets " resource-product-regenerated resources " Circular Economy, Neng Goushi Existing comprehensive utilization of resources.Tackle various gases separate and purification the need for, many technologies, including cryogenic condensation, liquid absorbent method, Solid absorption and membrane separation process can be used to separate and recover carbon dioxide, but they have the Pros and Cons of oneself.Based on solid The pressure swing adsorption of body absorption method（PSA）And vacuum pressure varying adsorption technology（VSA）, it has been widely used in hydrogen（H₂）, oxygen Gas（O₂）, nitrogen（N₂）, methane（CH₄）, carbon dioxide（CO₂）, carbon monoxide（CO）Deng the separating-purifying of industrial gasses.At present Untill, general pressure swing adsorption is implemented for chemical fertilizer factory's synthetic-ammonia transformation discharge gas or refinery emission The technique that carbon dioxide recovery is separate, generally by the way of tail gas is pressurizeed, carbon dioxide is adsorbed isolating under high pressure Come.During these carbon dioxide separations, existing process is generally pressurized to tail gas using compound compressor> 6 bar.a High pressure, the carbon dioxide in tail gas is reclaimed/removed using PSA principles.The technique can realize 85% or so the rate of recovery, And about 95% or so carbon dioxide purity.For a long time, because the technical characteristic of the pressure-variable adsorption, products C O is caused₂'s Purity is not high, be unfavorable for carbon dioxide further with.Simultaneously because to tail gas entire pressurisation, energy consumption is higher, therefore uses Existing pressure swing adsorption reclaims the waste that carbon dioxide causes the energy and resource.

The A1 of U.S. Patent application 2010/010449 describes a kind of dress with high thermal efficiency carbon dioxide recovery ability Put.The patent application shows that selection solvent cleaning system or PSA system can be used for CO₂Depart from, hydrogen-containing gas be recycled back into be System.It is apparent that description is shallow, also without the process detail of actual carbonization treatment.U.S. Patent application 2010/0287981 A1 describes various hydrogen and carbon dioxide recovery handling process in steam reforming system.Object gas in the invention are water coals Gas converts output object.Using conventional hydrogen PSA to H₂After recovery, tail gas is compressed to certain pressure and is first delivered to pressure Vacuum Pressure Swing Adsorption（PVSA）With membranous system to carbon dioxide recovery.However, both without embodiment in the invention, also without specific Flow（Circulation）Or detailed performance capabilities.Similarly in the A1 of U.S. Patent application US 2008/0072752, based on pressure Vacuum Pressure Swing Adsorption（PVSA）Be used to separate carbon dioxide and hydrogen, the step of the patent application publication with the technological process of PSA The rapid main pressure step included after charging adsorption step, a series of depressurization step, evacuation step, emptying, it is a series of Press step and press step again, the pressure requirements of the unstripped gas that the patent application is used are higher（100~500psia）, by high pressure Unstripped gas be down near atmospheric pressure by a series of depressurization steps so that in adsorbent adsorb non-CO₂Gas discharges So that the CO collected in subsequent evacuation step₂The purity lifting of product gas.The patent application is in itself to the pressure requirements of unstripped gas Height, and processing step is more, and equipment investment and operating cost are high.The treatment target of these existing process technologies is all hydrosphere transformation The discharge gas of reaction（Tail gas）.

In steam power plant's flue gas collecting carbonic anhydride technique, Vacuum Pressure Swing Adsorption（VSA）Also once it is used（Such as China Patent CN103055659B）, but power plant flue gas pressure is low in itself, gas concentration lwevel is low, it is necessary to be carried out in itself to flue gas Supercharging, and flue gas contains substantial amounts of aqueous vapor, it is necessary to pre-process removing in itself, because the partial pressure of carbon dioxide is low, therefore becomes Press the desorption vacuum level requirements of absorption high, generally in 1-3kPa absolute pressures or so, energy consumption is very big, and yield is not high, and dioxy Change concentration of carbon and be no more than 96%.

The current typical technology of reflection China, Chinese patent application CN104587797A proposes five sections of pressure-variable adsorptions and separates The flow method that separating-purifying goes out carbon dioxide, methane, carbon monoxide and hydrogen from refinery hydrogen production exhaust gas, but technique needs Compression refinery hydrogen production exhaust gas need product to pre-process to 0.85MPa, adsorption tower Numerous, pressure swing adsorption cycles step Excessively tediously long complexity, does not possess high-new efficiency technology and economic feasibility.Additionally, Chinese patent application CN102659104A is proposed Wet method decarburization again isolates carbon dioxide during series-transformer adsorbing separation flow becomes gas from refinery hydrogen manufacturing, to improve methane The method of hydrogen efficiency.In two sections of group technologies, carbon dioxide is refined by fluid pressurization flash distillation and high-pressure gaseous PSA Purification can be only achieved 98.6% purity, and equipment investment and operating cost are all very high.

Australian patent application AU2016201267A1 provides a kind of recovery carbon dioxide, high-purity hydrogen and production The compound two-stage process process of exotic fuels gas, including carbon dioxide vacuum pressure-variable adsorption（CO₂VSA）Stage and H₂Transformation Absorption（H₂PSA）Stage.The carbon dioxide vacuum pressure-variable adsorption stage presses step, carbon dioxide including adsorption step, following current Product gas purge step, following current press step, evacuate steps of exhausting, light reflux step, adverse current pressure step and pressurization step Suddenly.It is generally to be used to improve carbon dioxide product gas in traditional vacuum pressure swing absorption process that carbon dioxide product air-blowing therein is swept The step of purity, the carbon dioxide product gas of one side high concentration can be by CO₂The relatively low poor CO of content₂Gas is by absorption tower top Portion sends out adsorption tower, and the partial pressure that the carbon dioxide product gas of another aspect high concentration will greatly reduce not carbon dioxide gas contains Amount, and then realize the desorption of not carbon dioxide gas component and the second adsorption of carbon dioxide so that the carbon dioxide of absorption It is further purified.But of the step has the disadvantage that carbon dioxide, by multiple adsorption and desorption, reduces making for adsorbent With efficiency, raise the energy consumption of vavuum pump.

Sum it up, technology before is for the purpose of purifying not carbon dioxide gas, therefore design bed height is universal Higher, more than 3 meters, bed is high to cause pressure drop larger, therefore compression energy consumption is larger.In many petrochemical industry refinery exhausts, titanium dioxide Concentration of carbon is high（About 50%）And containing saturated steam at low temperature, the pressure swing adsorption cycles for using before are circulated based on " stripping " （stripping cycle）Mechanism, does not consider and shows consideration for the purity and yield of carbon dioxide.And for carbon dioxide In the traditional vacuum pressure swing absorption process of purification, product gas purge step is used（Or displacement step）It is used to improve carbon dioxide product The purity of product gas, this measure reduces the service efficiency of adsorbent, increased the energy consumption of vavuum pump, increased industrial cost.

Utility model content

The purpose of this utility model is to provide a kind of from containing CO₂Separating high-purity CO in unstripped gas₂Device, its feature It is that described device is one-part form Vacuum Pressure Swing Adsorption gas fractionation unit, described device includes air inlet surge tank 1, the first pipe Road 2, more than two adsorption towers, second pipe 4, the 3rd pipeline 5, the 4th pipeline 6, vavuum pump 7, poor CO₂Gas tank 8 and CO₂Produce Product tank 9；Each described adsorption tower includes intake valve, air bleeding valve, the first valve and the second valve, and absorption is placed with the adsorption tower Contain flow distribution plate in agent, the bottom of the adsorption tower；The air inlet surge tank 1 passes through first pipeline, the intake valve and institute State absorption tower bottom to be connected, make containing CO₂Unstripped gas enters the adsorption tower by the absorption tower bottom；Each adsorption tower Top passes through the second pipe 4, the air bleeding valve and poor CO₂Gas tank 8 is connected, for reclaiming poor CO₂Gas；Each suction The top of attached tower is interconnected by the 3rd pipeline 5 and the first valve, by controlling the switch of first valve, makes the absorption Gas between tower can mutually flow；The bottom of each adsorption tower passes through the 4th pipeline 6, the second valve and the phase of vavuum pump 7 Even, the vavuum pump 7 and the CO₂Products pot 9 is connected, for reclaiming CO₂Product gas.

Preferably, the height of adsorption tower is 0.5-2.0 meters in device of the present utility model.

Preferably, the number of adsorption tower is 4-10 in device of the present utility model.

Preferably, adsorbent is distributed in adsorption tower in the way of the layering filling of close phase.

Preferably, device of the present utility model also includes the top cushion tank being connected with adsorption tower top.

Preferably, device of the present utility model does not include the compressor for compressing unstripped gas.

Preferably, device of the present utility model is skid-mounted type equipment, including prizes block and one section be distributed in the sled block Formula Vacuum Pressure Swing Adsorption gas fractionation unit, the one-part form Vacuum Pressure Swing Adsorption gas fractionation unit includes air inlet surge tank （1）, the first pipeline（2）, more than two adsorption towers, second pipe（4）, the 3rd pipeline（5）, the 4th pipeline（6）, vavuum pump （7）, poor CO₂Gas tank（8）And CO₂Products pot（9）；Each described adsorption tower includes intake valve, air bleeding valve, the first valve and second Valve；Adsorbent is placed with the adsorption tower, flow distribution plate is contained in the bottom of the adsorption tower；Wherein described air inlet surge tank（1） It is connected with the absorption tower bottom by first pipeline, the intake valve, is made containing CO₂Unstripped gas is by the absorption tower bottom Into the adsorption tower；The top of each adsorption tower passes through the second pipe（4）, the air bleeding valve and poor CO₂Gas Tank（8）It is connected, for reclaiming poor CO₂Gas；The top of each adsorption tower passes through the 3rd pipeline（5）And first valve mutually interconnect It is logical, by controlling the switch of first valve, the gas between the adsorption tower is mutually flowed；Each described adsorption tower Bottom pass through the 4th pipeline（6）, the second valve and vavuum pump（7）It is connected, the vavuum pump（7）With the CO₂Products pot（9）Phase Even, for reclaiming CO₂Product gas.

Preferably, sled block described in the utility model is container.

Preferably, device of the present utility model includes automatic control system.

It is highly preferred that automatic control system is programmable logic controller (PLC) with communication mode or with communication mode Dcs.

Using Vacuum Pressure Swing Adsorption gas fractionation unit of the present utility model from containing CO₂Separating high-purity CO in unstripped gas₂Energy Enough obtain gratifying CO₂Purity and the rate of recovery.The utility model device is not to unstripped gas（Tail gas）Any compression is carried out, it is former Material gas is directly entered Vacuum Pressure Swing Adsorption gas fractionation unit of the present utility model carries out CO₂Separating-purifying, and this practicality is new Tower height degree is low, cycle period is short for the device absorption of type, is industrial production purification CO₂The cost-effective, economic worth that generation is huge. On the other hand, device of the present utility model is skid-mounted type equipment, efficiently solves general variable-pressure adsorption equipment floor space Greatly, transport, mobile difficult defect.In the device with automatic control system, long-range/radio operation and control can also be realized System operation.

Brief description of the drawings

Fig. 1 is the circulation process figure of the one embodiment for using the utility model device.

Fig. 2 is the structure chart of Vacuum Pressure Swing Adsorption gas fractionation unit of the present utility model.

Specific embodiment

Device of the present utility model is further elaborated below in conjunction with the accompanying drawings, but the utility model is not limited in In the scope of described specific embodiment.

It is described in the utility model containing CO₂The CO contained in unstripped gas₂For>15%（Volume ratio）, it is preferable that the CO for containing₂ It is 30%-60%（Volume ratio）, additionally, the unstripped gas suitable for the utility model can also contain any one or more of group Point, such as water（H₂O）, hydrogen（H₂）, methane（CH₄）, carbon monoxide（CO）, nitrogen（N₂）, oxygen（O₂）Or a small amount of other gases Component.The content of the various components that different unstripped gas is included is different, and representational unstripped gas is steam methane weight Tail gas, producing synthesis gas from coal of whole Hydrogen Unit etc..It is described containing CO₂The pressure limit of unstripped gas is 0-50KPa gauge pressures, usually 30-40KPa gauge pressures, temperature range is 10-50 °C.

Using Vacuum Pressure Swing Adsorption gas fractionation unit of the present utility model from containing CO₂Separating high-purity CO in unstripped gas₂Can Carried out by the circulation work of adsorption tower, for example, comprised the following steps：

Charging adsorption step：CO will be contained₂Unstripped gas by adsorb tower bottom switch valve inject adsorption tower in, now The pressure limit of unstripped gas is 0-50KPa gauge pressures, usually 30-40KPa gauge pressures, and temperature is 10-50 °C.Comprising extremely in adsorption tower Few one kind Preferential adsorption CO with a temperature of in feed pressure₂Adsorbent, these adsorbents can include one or more of： Zeolite（Wessalith CS, X zeolite, zeolite Y etc.）, activated carbon, activated alumina, metal organic framework, silica gel or other it is any may be selected Property CO absorption₂Better than non-CO₂The solid particulate Molecular Adsorption material of gas.The adsorbent is in adsorption tower with close phase layering side Formula is loaded.Using dense phase loading method, adsorbent can regularly be arranged along radial direction in reactor in radioactivity, so that The hole between absorbent particles is reduced, the loading density of adsorbent is improved.Dense phase loading in addition to it can fill adsorbent more, due to Absorbent particles regular arrangement in reactor cross-section during filling, therefore it is close along the filling of adsorption tower longitudinal direction, radial direction Degree is also highly uniform.The dense phase loading of adsorbent, it can be ensured that the uniform flow distribution of unstripped gas, with to greatest extent, fully Act on adsorbent.Compared with traditional packing method, the closely knit filling of adsorbent has the following advantages that：1. adsorption tower can Many filling adsorbents, improve usage cycles, the improve product quality of working ability or extension adsorbent；2. adsorbent bed filling Uniformly, it is closely consistent, dead space can be reduced, reduce relative displacement；3. adsorbent bed radial temperature is uniform；Used when 4. loading Special machinery, continuous operations, packing speed is greatly improved.Unstripped gas is most of in unstripped gas from bottom to top by adsorption tower CO₂It is adsorbed agent in gas flow to be adsorbed, unstripped gas is changed into poor CO₂Gas is discharged by adsorption tower top.Discharge Poor CO₂Gas can be expelled to poor CO₂Gas tank enters in other adsorption towers for just completing evacuate steps of exhausting or enters just completion In other adsorption towers of adverse current pressurization steps.Into poor CO₂The gas of gas tank can fed downstream be further processed or directly Discharge；Poor CO into the adsorption tower for just having completed adverse current pressurization steps₂Gas may be used to improve the pressure in other adsorption towers, CO wherein not to be adsorbed₂Absorption again is carried out, CO is improve₂The rate of recovery of gas；Steps of exhausting is evacuated into just completion Adsorption tower poor CO₂Gas has the effect of cleaning, improves CO₂The rate of recovery of gas.

Co-current depressurization step：It is the co-current depressurization step of one or more after charging adsorption step.Work as CO₂Absorption before During along a certain position for moving to bed, the switch valve stopping unstripped gas for closing absorption tower bottom enters adsorption tower, stops absorption. The valve at the top of the adsorption tower is opened, it is connected and other adsorption towers for just completing light reflux step between, by the absorption The poor CO of tower discharge₂Gas enters other adsorption towers via the top of other adsorption towers, makes pressure therebetween balanced, so as to carry The pressure of the adsorption tower for just completing light reflux step high.The step can reach the adsorption tower for reducing and completing charging adsorption process The effect of interior pressure, makes the poor CO remained in the adsorption tower₂Gas discharges the adsorption tower, and make also to remain in adsorbent except CO₂ Other gas components in addition are discharged, and CO in final products gas is improved with this₂Concentration, and recirculate into vacuum become Poor CO in pressure device₂A small amount of CO in gas₂Can further adsorb, improve CO₂The rate of recovery.By co-current depressurization Step, with the reduction of the absorption tower pressure interior force, the CO adsorbed in adsorbent₂Progressively desorb.According to absorption tower pressure interior force change Situation, co-current depressurization step can perform one or many, until the pressure in the adsorption tower reaches certain value.

Evacuate steps of exhausting：The connection of the adsorption tower and other adsorption towers is closed, the absorption tower bottom and vavuum pump is opened The valve of connection, adsorbent CO in the adsorption tower is reclaimed by vavuum pump₂, with the reduction of absorption tower pressure interior force, quilt The CO of absorption₂Gas is desorbed from adsorbent, the CO of desorption₂Into the CO connected with vavuum pump₂Products pot.

Light reflux step：Keep the connection of the adsorption tower and vavuum pump, by the adsorption tower top with carry out charging absorption Other adsorption towers top connection of step, the poor CO of other adsorption towers top discharge₂Gas enters through the tower top of the adsorption tower should Adsorption tower.Because vavuum pump remains work, the adsorption tower is maintained under certain vacuum pressure, and the absorption is entered from top The poor CO of tower₂The flow of gas is big, good fluidity, helps to release remaining CO on adsorbent space and adsorbent₂.By inhaling The attached dose of CO for further desorbing₂, in poor CO₂CO is entered by vavuum pump under the promotion of gas₂Products pot.Walked by light reflux Suddenly CO can further be improved₂The rate of recovery of product gas.

Adverse current pressurization steps：It is one or more adverse current pressurization steps after light reflux step.Close the adsorption tower with The connection of vavuum pump, the adsorption tower is connected with the tower top of other adsorption towers for just completing charging adsorption step, other adsorption towers In by co-current depressurization step discharge poor CO₂Gas enters the adsorption tower through tower top, makes the equilibrium of the two pressure to lift the suction Pressure in attached tower.According to absorption tower pressure interior force situation of change, adverse current pressurization steps can perform one or many, until absorption Pressure in tower reaches certain value.

Pressurization steps：The step is pressure increase step before adsorption tower charging, can be realized by two ways：One is unstripped gas Pressurization, i.e., the valve introducing unstripped gas for only opening absorption tower bottom is pressurized；Secondly being poor CO₂Gas boosting, i.e., only open Valve at the top of adsorption tower introduces poor CO₂Gas is pressurized, now open the adsorption tower with carry out feed adsorption step its Connection between his adsorption tower, by the poor CO of other adsorption towers top discharge₂Gas enters the adsorption tower to lift tower pressure interior force. By pressurization steps, the pressure in adsorption tower is set to reach certain value, to prevent next step from being inhaled caused by pressure difference is excessive when entering raw material Attached laminarization, causes adsorbent attrition to consume, and influence system is run steadily in the long term.

The adsorption tower for completing pressurization steps is back to charging adsorption step, repeats above steps and is adsorbed.These steps The rapid alternate cycles between multiple adsorption towers of vacuum pressure swing adsorption apparatus are repeated.Device of the present utility model at least needs two It is individual be filled with adsorptive pressure and at a temperature of Preferential adsorption CO₂Adsorbent adsorption tower, the number of adsorption tower can also be three Tower or more, preferably four to ten towers, each adsorption tower is with coupled modes circular flow.

Fig. 1 is the circulation process figure of an implementation method for using the utility model device.

Vacuum Pressure Swing Adsorption gas fractionation unit of the present utility model is as shown in Figure 2.Described device includes air inlet surge tank 1, the first pipeline 2, adsorption tower, second pipe 4, the 3rd pipeline 5, the 4th pipeline 6, vavuum pump 7, poor CO₂Gas tank 8 and CO₂Product Tank 9.

Device as shown in Figure 2 is four tower structures（Respectively 3A, 3B, 3C, 3D）, each adsorption tower is respectively with intake valve （Respectively 10A, 10B, 10C, 10D）, air bleeding valve（Respectively 11A, 11B, 11C, 11D）, two group of first valve（Respectively 12A, 12B；12C, 12D；12E, 12F；12G, 12H）With the second valve（Respectively 13A, 13B, 13C, 13D）.But suction of the present utility model The number of attached tower is not limited to four shown in Fig. 2.The number of the first valve contained by each adsorption tower is not limited to two shown in Fig. 2 It is individual, when the number of adsorption tower in device is less（Such as two tower structures）, the number of the first valve contained by each adsorption tower can One is thought, when the number of adsorption tower in device is more（Such as eight tower structures）, the first valve contained by each adsorption tower Number can be three or more.The effect of the first valve is the gas between adsorption tower is circulated, and many valve arrangements can be reduced The loss of valve, the service life of extension fixture.The first valve 12A and 12B of adsorption tower 3A as shown in Figure 2, the first valve 12A can Pressure balance in for carrying out co-current depressurization step or adverse current pressurization steps between adsorption tower 3A and other adsorption towers, the first valve 12B can be used to feed adsorption step, light reflux step or poor CO in pressurization steps₂Gas turnover adsorption tower 3A, the first valve 12A Purposes with 12B according to circumstances can also be exchanged mutually, and 12A or 12B can also individually complete such use.The utility model is filled The height of the adsorption tower put is 0.5-2.0 meters, preferably 1.0-2.0 meters, is placed with adsorption tower excellent with a temperature of in adsorptive pressure First CO absorption₂Adsorbent.Adsorbent is distributed in adsorption tower in the way of the layering filling of close phase.Also contain the bottom of adsorption tower Flow distribution plate, so that the air-flow into adsorption tower can uniformly enter adsorbent.

Wherein air inlet surge tank 1 is connected by first pipeline, the intake valve with the absorption tower bottom, makes to contain CO₂Unstripped gas enters the adsorption tower by the absorption tower bottom.The top of each adsorption tower passes through the second pipe 4th, the air bleeding valve and poor CO₂Gas tank 8 is connected, for reclaiming poor CO₂Gas；The top of each adsorption tower is by the 3rd pipe The valve of road 5 and first is interconnected, and by controlling the switch of first valve, allows the gas between the adsorption tower mutual Flowing.The bottom of each adsorption tower is connected by the 4th pipeline 6, the second valve with vavuum pump 7, the vavuum pump 7 with it is described CO₂Products pot 9 is connected, for reclaiming CO₂Product gas.Second valve in the utility model device can be check valve, in this feelings Under condition, device of the present utility model only can be by the second valve by the CO in adsorption tower₂It is recycled to CO₂In products pot 9, and can not Reversely by CO₂Products pot 9 is input into CO to adsorption tower₂Product gas, that is to say, that device of the present utility model is applied to not comprising CO₂ The method of product gas purge step.In the utility model device the switch of each valve can by automatic control system carry out remotely/ Wireless operated.

Device of the present utility model also includes the top cushion tank being connected with adsorption tower top（Not shown in figure）.

Device of the present utility model does not include the compressor for compressing unstripped gas.

Vacuum Pressure Swing Adsorption gas fractionation unit of the present utility model is in sled block（Not shown in figure）It is interior to be distributed to form sled Dress formula equipment." sled block " in the utility model refers to any knot for being suitably packaged the Vacuum Pressure Swing Adsorption gas fractionation unit Structure, the container that can be for example transported by transportation resources such as truck, train, freighter or aircrafts.Now, on container with enter Gas surge tank 1, poor CO₂Gas tank 8 and CO₂The corresponding position of products pot 9 be respectively equipped with pipeline import and export be used to be input into unstripped gas and Export poor CO₂Gas and CO₂Product gas.Skid-mounted type equipment provides modular, integrated, moveable gas and separates dress Put, there is small facility compact, floor space, conveniently moving, convenient operating maintenance.

Used as a kind of preferred embodiment of the present utility model, device of the present utility model includes automatic control system, example Such as carry the programmable logic controller (PLC) of communication mode（PLC）Or the dcs with communication mode（DCS）, now Device of the present utility model can long-range/radio operation and control operation.What those skilled in the art according to gas can separate It is required that carrying out remotely/wireless operated to the utility model device by automatic control system.

Vacuum Pressure Swing separator described in the utility model is illustrated with reference to Fig. 1 and Fig. 2.

As shown in figure 1, each adsorption tower experiences eight steps in a cyclic process, by taking adsorption tower 3A as an example, including：

A）Charging adsorption step（AD）：Intake valve 10A is opened, unstripped gas is entered by air inlet surge tank 1 and admission line 2 Adsorption tower 3A, unstripped gas passes through adsorption tower 3A, the CO in unstripped gas from bottom to top₂Adsorbent in adsorbed tower is adsorbed, former Material gas is changed into poor CO₂Gas.Now as needed, poor CO₂Gas can be managed by air bleeding valve 11A, 11B, 11C, 11D and second Road 4 enters poor CO₂Gas tank 8, is further processed；Can also enter carries out light reflux step（LR）Or enter The poor CO of row₂Gas pressurized step（WRP）Other adsorption towers, now the first valve 12A or 12B at the top of adsorption tower 3A and Carry out light reflux step（LR）Or carry out poor CO₂Gas pressurized step（WRP）Other adsorption towers at the top of it is corresponding First valve is opened, poor CO₂Gas is inhaled by the top of other adsorption towers by the 3rd pipeline 5 from the top of adsorption tower 3A into other Attached tower.

B）Co-current depressurization step 1（COC PE1）：When the pressure in adsorption tower 3A reaches a predetermined value, adsorption tower is closed The intake valve 10A of 3A bottoms, opens adsorption tower 3A and carries out adverse current pressurization steps（CCC PE）Other adsorption towers between Connection, close adsorption tower 3A and poor CO₂Connection between gas tank, now the first valve 12A or 12B at the top of adsorption tower 3A with And corresponding first valve carried out at the top of other adsorption towers of adverse current pressurization steps is remained on, in adsorption tower 3A Poor CO₂Gas enters other adsorption towers by the 3rd pipeline 5 from adsorption tower 3A tops by the top of other adsorption towers, so that absorption The pressure of tower 3A and other adsorption towers is balanced.

C）Co-current depressurization step 2（COC PE2）：Choosing another is carrying out the adsorption tower of adverse current pressurization steps, will inhale Attached tower 3A is connected with the adsorption tower, repeats the operation of co-current depressurization step 1.

D）Evacuate steps of exhausting（EV）：The valve closed at the top of adsorption tower 3A, opens the second valve of adsorption tower 3A bottoms 13A, opens vavuum pump 7, by adsorbent CO₂It is recycled to CO₂In products pot 9.

E）Light reflux step（LR）：After evacuation steps of exhausting terminates, the connection of adsorption tower 3A and vavuum pump 7 is kept, will Adsorption tower 3A with carry out feed adsorption step other adsorption towers connect, now the first valve 12A at the top of adsorption tower 3A or 12B and corresponding first valve for carrying out feeding at the top of other adsorption towers of adsorption step are opened, in the effect of vavuum pump 7 Under, the poor CO in other adsorption towers₂The quick pipeline 5 of top the 3rd from other adsorption towers of air-flow at the top of adsorption tower 3A by entering Enter adsorption tower 3A.By poor CO₂CO remaining on adsorbent space and adsorbent in the adsorption tower 3A that air-flow is released₂Through vacuum blowback Receive to CO₂In products pot.

F）Adverse current pressurization steps 1（CCC PE1）：The second valve 13A of vavuum pump 7 and adsorption tower 3A bottoms is closed, will be adsorbed Tower 3A with just complete charging adsorption step other adsorption towers connect, now the first valve 12A or 12B at the top of adsorption tower 3A with it is firm Corresponding first valve at the top of other adsorption towers of charging adsorption step is completed to remain on, it is poor in other adsorption towers CO₂Gas enters adsorption tower 3A from the pipeline 5 of top the 3rd of other adsorption towers by the top of adsorption tower 3A, make adsorption tower 3A with Pressure is balanced between other adsorption towers, the pressure in lifting adsorption tower 3A.

G）Adverse current pressurization steps 2（CCC PE2）：Another adsorption tower for just having completed charging adsorption step is chosen, will be inhaled Attached tower 3A is connected with the adsorption tower, repeats the operation of adverse current pressurization steps 1.

H）Poor CO₂Gas pressurized step（WRP）：Other adsorption towers closed in adsorption tower 3A and adverse current pressurization steps 2 it Between connection, by adsorption tower 3A and carry out feeding the connection between other adsorption towers of adsorption step and open, now adsorb The first valve 12A or 12B at the top of tower 3A and carrying out feeding corresponding first at the top of other adsorption towers of adsorption step Valve is remained on, and is carrying out feeding the interior poor CO for producing of other adsorption towers of adsorption step₂Gas is from other adsorption towers The pipeline 5 of top the 3rd adsorption tower 3A is entered by adsorption tower 3A tops, the further pressure of lifting adsorption tower 3A.

Adsorption tower 3A returns to charging adsorption step afterwards, repeats above-mentioned A）-H）The step of.Vacuum Pressure Swing of the present utility model The equal circular flow above-mentioned steps of each adsorption tower in adsorbent equipment, above-mentioned steps A）-H）Alternately coupled between each adsorption tower Carry out, i.e., when certain adsorption tower carries out a certain step, other adsorption towers correspondingly carry out other steps, are endlessly produced with this The CO of raw high-purity₂Product gas.For example, certain adsorption tower carries out light reflux step, other adsorption towers can be set and is in Charging adsorption step, so that the poor CO that other adsorption towers charging adsorption step is produced₂Gas is used as this adsorption tower light reflux The purgative gas of step；Again for example, certain adsorption tower carries out co-current depressurization step, other adsorption towers can be set and is in adverse current Pressurization steps, other inhale adsorption tower can connect between this adsorption tower so as to realize pressing；Again for example, certain adsorption tower enters The poor CO of row₂Gas pressurized step, settable other adsorption towers are in and carry out charging adsorption step, feed other adsorption towers and inhale The poor CO that attached step is produced₂Gas is used as the poor CO of this adsorption tower₂The pressurization gas of gas pressurized step.

As the another embodiment using the utility model device, the poor CO in Fig. 1₂Pressurization steps（WRP）Also may be used To use unstripped gas pressurization steps（FRP）To substitute.Still by taking adsorption tower 3A as an example, other steps are identical with Fig. 1, in adverse current pressurization step After rapid 2, the connection closed between adsorption tower 3A and other adsorption towers, the first the valve 12A or 12B closed at the top of adsorption tower 3A, The intake valve 10A of adsorption tower 3A bottoms is opened, unstripped gas enters adsorption tower 3A, makes suction by the first pipeline 2 by absorption tower bottom Pressure in attached tower 3A reaches certain value.

Device of the present utility model, unstripped gas need not be compressed and can be directly used for vacuum change described in the utility model Pressure gas fractionation unit carries out CO₂Isolation and purification, this measure can reduce energy consumption, reduces cost.Also, it is of the present utility model Device is applied to not comprising CO₂The method of product gas purge step, it is to avoid CO in traditional vacuum transformation gas separating technology₂Two The problem of secondary absorption, improves adsorbent unit interval utilization rate, reduces vavuum pump energy consumption.Therefore, it is true compared to routine Space-variant pressure gas fractionation unit uses medium/high pressure, and the circulation step time is more long, adsorption tower relatively largeization, heaviness, and this practicality is new The appliance arrangement of type can be minimized, and absorption tower height degree is low, and the sorption cycle time is short, has saved equipment capital input, reduces Operation consumption.And the utility model is skid-mounted type equipment, the part such as adsorption tower, pipeline is in sled block according to construction standard collection composition Cloth, facility compact, floor space are small, be easy to movement.In addition, the addition of automatic control system so that device of the present utility model Can long-range/wireless operated.

Embodiment 1-3

From refinery Methane Steam Reforming tail gas（Containing CO₂Unstripped gas）Middle separation and Extraction high-purity CO₂。

The tail gas of refinery Methane Steam Reforming system discharge（Containing CO₂Unstripped gas）It is rich in CO₂Industrial tail Gas, its usual component such as following table：

The component of the refinery Methane Steam Reforming system emission of table 1

The pressure of unstripped gas is gauge pressure 0-50KPa, and temperature is 10-50 °C.Using step as shown in Figure 1 and such as Fig. 2 institutes The Vacuum Pressure Swing gas fractionation unit for showing separates above-mentioned raw materials gas, the number of adsorption tower wherein in Vacuum Pressure Swing gas fractionation unit Respectively 4,6 and 8.Adsorption tower adsorbent is silica gel, activated carbon and X zeolite（Filling ratio is volume ratio 1:1:5）.Obtain CO₂The purity of product gas is all higher than 99%, and the rate of recovery is all higher than 86%.

Embodiment 4-6

From producing synthesis gas from coal（Containing CO₂Unstripped gas）Middle separation and Extraction high-purity CO₂。

Producing synthesis gas from coal（Containing CO₂Unstripped gas）It is rich in CO₂Industrial gasses, its usual component such as following table：

The component of the producing synthesis gas from coal of table 2

The pressure of unstripped gas is gauge pressure 0-50KPa, and temperature is 10-50 °C.Using step as shown in Figure 1 and such as Fig. 2 institutes The Vacuum Pressure Swing gas fractionation unit for showing separates above-mentioned raw materials gas, wherein being replaced described in Fig. 1 using unstripped gas pressurization steps Poor CO₂Gas pressurization steps, remaining step is identical with Fig. 1.The number difference of adsorption tower wherein in Vacuum Pressure Swing gas fractionation unit It is 4,6 and 8.Adsorbent is silica gel, activated carbon and X zeolite in adsorption tower（Filling ratio is volume ratio 1:1:6）.Obtain CO₂The purity of product gas is all higher than 99%, and the rate of recovery is all higher than 86%.

CO₂The computational methods of purity of product gas and the rate of recovery are：

The CO for using the utility model equipment separate₂Gas purity passes through infrared on line analysis instrument（Such as Britain Servomex 2400）Real-time online measure is carried out, sample tap is arranged on CO₂After products pot.

CO₂The computational methods of the rate of recovery of gas are：

Carbon dioxide flow in the carbon dioxide flow/unstripped gas of recovery rate of CO 2=vacuum pump outlet.

As seen from the above embodiment, it is used to purify CO using gas fractionation unit of the present utility model₂, can obtain substantially Purity>99% and the rate of recovery>86% CO₂Product gas.This excellent separating property performance, can be industrial production reclaiming clean CO₂Save significant cost.

Claims (10)

1. one kind is from containing CO₂Separating high-purity CO in unstripped gas₂Device, it is characterised in that described device be one-part form vacuum become Pressure adsorptive gas separation apparatus, described device includes air inlet surge tank（1）, the first pipeline（2）, more than two adsorption towers, the Two pipelines（4）, the 3rd pipeline（5）, the 4th pipeline（6）, vavuum pump（7）, poor CO₂Gas tank（8）And CO₂Products pot（9）；Each The adsorption tower includes intake valve, air bleeding valve, the first valve and the second valve；Adsorbent, the absorption are placed with the adsorption tower Contain flow distribution plate in the bottom of tower；Wherein described air inlet surge tank（1）By first pipeline, the intake valve and the absorption Tower bottom is connected, and makes containing CO₂Unstripped gas enters the adsorption tower by the absorption tower bottom；The top of each adsorption tower leads to Cross the second pipe（4）, the air bleeding valve and poor CO₂Gas tank（8）It is connected, for reclaiming poor CO₂Gas；Each absorption The top of tower passes through the 3rd pipeline（5）And first valve be interconnected, by controlling the switch of first valve, make the absorption Gas between tower can mutually flow；The bottom of each adsorption tower passes through the 4th pipeline（6）, the second valve and vavuum pump （7）It is connected, the vavuum pump（7）With the CO₂Products pot（9）It is connected, for reclaiming CO₂Product gas.

2. device according to claim 1, it is characterised in that the height of the adsorption tower is 0.5-2.0 meters.

3. device according to claim 1, it is characterised in that the number of the adsorption tower is 4-10.

4. device according to claim 1, it is characterised in that the adsorbent close phase layering dress in the adsorption tower Fill out.

5. device according to claim 1, it is characterised in that also including top cushion that adsorption tower top is connected Tank.

6. device according to claim 1, it is characterised in that described device does not include the compression for compressing unstripped gas Machine.

7. device according to claim 1, it is characterised in that described device is skid-mounted type equipment, including sled block and distribution One-part form Vacuum Pressure Swing Adsorption gas fractionation unit in the sled block, the one-part form Vacuum Pressure Swing Adsorption gas separates dress Put including air inlet surge tank（1）, the first pipeline（2）, more than two adsorption towers, second pipe（4）, the 3rd pipeline（5）, the 4th Pipeline（6）, vavuum pump（7）, poor CO₂Gas tank（8）And CO₂Products pot（9）；Each described adsorption tower includes intake valve, exhaust Valve, the first valve and the second valve；Adsorbent is placed with the adsorption tower, flow distribution plate is contained in the bottom of the adsorption tower；Wherein institute State air inlet surge tank（1）It is connected with the absorption tower bottom by first pipeline, the intake valve, is made containing CO₂Unstripped gas The adsorption tower is entered by the absorption tower bottom；The top of each adsorption tower passes through the second pipe（4）, the row Air valve and poor CO₂Gas tank（8）It is connected, for reclaiming poor CO₂Gas；The top of each adsorption tower passes through the 3rd pipeline（5）With And first valve be interconnected, by controlling the switch of first valve, the gas between the adsorption tower is mutually flowed； The bottom of each adsorption tower passes through the 4th pipeline（6）, the second valve and vavuum pump（7）It is connected, the vavuum pump（7）With it is described CO₂Products pot（9）It is connected, for reclaiming CO₂Product gas.

8. device according to claim 7, it is characterised in that the sled block is container.

9. the device according to claim 1-8 any one, it is characterised in that described device includes automatic control system.

10. device according to claim 9, it is characterised in that the automatic control system be with communication mode can Programmed logic controller or the dcs with communication mode.