CN1631489A - Pressure swing absorption method for preparing nitrogen from air - Google Patents
Pressure swing absorption method for preparing nitrogen from air Download PDFInfo
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- CN1631489A CN1631489A CN 200410081281 CN200410081281A CN1631489A CN 1631489 A CN1631489 A CN 1631489A CN 200410081281 CN200410081281 CN 200410081281 CN 200410081281 A CN200410081281 A CN 200410081281A CN 1631489 A CN1631489 A CN 1631489A
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Abstract
The invention is about a way of making nitrogen spirit by changing press in the air, which concerns about separating and making nitrogen spirit by changing press to attach the air. It mainly solves the problem that the current technique is easy to pine when fixed largely; the system operates through the procedure. The attaching bed operate as follows: attach, press down, press out, press up and fill press. Because we adopt the craft, the process is more close in the whole craft, avoid the attaching equipment close and crashed, overcome the difficulty of operation of large press-changing attach nitrogen spirit.
Description
Technical field:
The present invention relates to chemical field pressure swing adsorption air isolation technique, specifically, relate in transformation absorption nitrogen production by air separation by adopting along putting and the novel method of the transformation absorption nitrogen production by air separation of the flow process of finding time.
Background technology:
By same applicant application, the patent No. is that ZL00113066.8, denomination of invention are that the patent of invention of pressure-changeable gas-adsorption separation method and device discloses a kind of multitower pressure swing adsorption gas separation device and method, each adsorption tower once circulation experience absorption successively, repeatedly pressure equalization fall, along put or reversely put pressure, vacuumize, repeatedly the pressure equalization liter, step such as fill eventually; The evacuation step of each adsorption tower is divided into several stages again; Evacuation step continuously and have partly overlappingly, the quantity that is in the tower of evacuated by synchronization is divided into the group of this quantity with adsorption tower, it is discontinuous to find time in every group.
Above-mentioned patent does not disclose the method for the concrete gas of any preparation.
And the existing pressure swing adsorption air that belongs to the pressure swing adsorption air isolation technique separates and produces the nitrogen device and all adopt absorption, all pressure drops, reverse pressures (or finding time), equal voltage rise, the pressurising step of putting; Wherein a large amount of stripping gass is pressed and evacuation step discharge adsorption bed by reverse putting; Because absorption and the reverse air flow line of putting the maximum steps of 2 airsheds of pressure are in opposite directions, cause sorbent material to move in adsorption bed easily, therefore must adopt special hold-down gear that sorbent material is compressed; The sorbent material hold-down gear of flange form or alternate manner is difficult on the engineering implementing to the adsorption tower manufacturing cost height more than the adsorption tower diameter 2000mm.So pressure swing adsorption air separation is at present produced the unit scale of nitrogen substantially all at single cover 1000Nm
3In/the h; Usually the adsorption cycle of transformation absorption nitrogen production by air separation device is all at 60～90 seconds, and the change of air flow line is very frequent, and gas is bigger at the flow velocity of some step simultaneously; To cause the sorbent material efflorescence that rubs mutually if sorbent material moves in adsorption bed, and then to cause that product purity descends, recovery rate descends; Cause valve, line clogging to form potential safety hazard when serious.
Technology contents:
Goal of the invention of the present invention is intended to overcome above-mentioned prior art defective, provide a kind of the employing along putting to separate the method for producing nitrogen, on maximization transformation absorption nitrogen production by air separation device, need not adopt the special adsorbent hold-down gear just can avoid that sorbent material is unsteady, the atomizing method with the pressure swing adsorption air of the flow process of finding time; Adopt the equipment cost of this method low and be easy to maximize.
The present invention is achieved its goal of the invention by following technical solution:
Pressure swing adsorption air of the present invention separates in the pressure swing adsorption system that the method for producing nitrogen is applied in two adsorption beds that are filled with carbon molecular sieve adsorbent at least, and the each run of adsorption bed comprises: absorption, all pressure drops, forward put that pressures, adsorption bed nitrogen outlet end are found time, equal voltage rise, pressurising step; Adopted forward to put and pressed finding time of step and adsorption bed nitrogen outlet end, made the air flow line unanimity of in whole adsorption process, passing through adsorption bed; Above step cycle operation.
Pressurized air 0.1～2.0Mpa by on from entering down the adsorption bed that is filled with carbonaceous molecular sieve, oxygen is obtained product nitrogen gas by the carbonaceous molecular sieve selective adsorption from the adsorption bed lower end; Finish adsorption step, open the sequencing valve on adsorption bed lower end and another adsorption bed connecting tube after absorption is finished, make gas enter another adsorption bed and carry out equal voltage drop step by the adsorption bed lower end; After adsorption bed is finished equal voltage drop step, forward put the pressure step, the sequencing valve that open to connect the adsorption bed lower end is put into atmosphere with gas after by pipeline and sourdine, adopts vacuum pump that the adsorption bed of forward putting after the pressure is found time, vacuum pressure is controlled at 0～-the 0.09Mpa scope in; Enter adsorption bed by the gas of the equal pressure drop of another adsorption bed after finding time to finish and carry out equal voltage rise; Utilize pressurized air from adsorption bed upper end or utilize product nitrogen gas adsorption bed to be pressurized to adsorptive pressure simultaneously from the adsorption bed lower end.
Above-mentioned equal voltage drop step is opened the sequencing valve on adsorption bed lower end and another adsorption bed upper end connecting tube, makes gas carry out equal pressure drop by the upper end that the adsorption bed lower end enters another adsorption bed;
Or the sequencing valve on unlatching adsorption bed lower end and another adsorption bed lower end connecting tube, equal pressure drop is carried out in the lower end that makes gas enter another adsorption bed from the adsorption bed lower end.
The present invention compares with existing transformation absorption nitrogen production by air separation method, has following evident characteristic.
The present invention has adopted forward to put and has pressed step to replace the contrary of common transformation absorption nitrogen production by air separation to stride suddenly, at first make and comprise in absorption and the desorb consistent and be from top to bottom by the air flow line of adsorption bed in whole pressure swing adsorption technique process, make in the adsorption bed movement tendency of sorbent material tightr, thereby realize preventing that sorbent material from becoming flexible the atomizing purpose; Next is that method of the present invention is adsorbed on the nitrogen production by air separation device in fairly large transformation, thereby can replace flange plate type or other sorbent material hold-down gears cost of economizer greatly; And make the maximization transformation adsorb the easier enforcement of nitrogen production by air separation; The 3rd is that the security reliability improves.
Description of drawings
Fig. 1 is a process flow sheet of the present invention;
Fig. 2 is a process flow sheet of the present invention;
Fig. 3 is a process flow sheet of the present invention;
Fig. 4 is a process flow sheet of the present invention;
The invention will be further described below in conjunction with the specific embodiment of the present invention
Embodiment
Transformation of the present invention absorption nitrogen production by air separation device is made of 2 adsorption towers that are filled with carbon molecular sieve adsorbent and 1 pressurized air surge tank and 1 vacuum tank of 1 product nitrogen gas surge tank and corresponding pipeline and sequencing valve and vacuum pump.The pressurized air of 1.5Mpa enters this device after the cooling driers dehydration, pressurized air enters adsorption bed from top to bottom by sequencing valve KVA-1 behind the air cushioning jar, airborne oxygen is adsorbed the carbonaceous molecular sieve absorption of loading in the bed, product nitrogen gas from the adsorption bed lower end after sequencing valve KVA-2 and pipeline enter the product nitrogen gas surge tank take-off equipment.Close KVA-1 after being adsorbed onto certain hour, the KVA-2 sequencing valve is finished adsorption step, it is 0.73Mpa that unlatching KVA-4 sequencing valve all presses step all to press whole pressure, close sequencing valve KVA-4 after all pressing step to finish, it is 0.05Mpa～0.0Mpa along putting whole pressure that unlatching sequencing valve KVA-3 carries out along strideing rapid, rapid gas is put into atmosphere behind sound damper along strideing, suddenly close sequencing valve KVA-3 along strideing after finishing, opening sequencing valve KVA-5 finds time to close sequencing valve KVA-5 after evacuation step is finished to adsorption bed, open the KVB-4 sequencing valve adsorption bed carries out cutting out sequencing valve KVB-4 after the equal voltage rise of equal voltage rise is finished, open sequencing valve KVA-1 and sequencing valve KVA-2 sequencing valve then and utilize the nitrogen in pressurized air and the product gas surge tank that adsorption bed is carried out the pressurising step.Finish once circulation thus, the above-mentioned working cycle that hockets of two adsorption beds.Can obtain product nitrogen gas continuously.The purity of product nitrogen gas is in 80%～99.9% scope.
Transformation of the present invention absorption nitrogen production by air separation device is made of 2 adsorption towers that are filled with carbon molecular sieve adsorbent and 1 pressurized air surge tank and 1 vacuum tank of 1 product nitrogen gas surge tank and corresponding pipeline and sequencing valve and vacuum pump.The pressurized air of 1.0Mpa enters this device after the cooling driers dehydration, pressurized air enters adsorption bed from top to bottom by sequencing valve KVA-1 behind the air cushioning jar, airborne oxygen is adsorbed the carbonaceous molecular sieve absorption of loading in the bed, product nitrogen gas from the adsorption bed lower end after sequencing valve KVA-2 and pipeline enter the product nitrogen gas surge tank take-off equipment.Close KVA-1 after being adsorbed onto certain hour, the KVA-2 sequencing valve is finished adsorption step, it is 0.5Mpa that unlatching KVA-4 sequencing valve all presses step all to press whole pressure, close sequencing valve KVA-4 after all pressing step to finish, it is 0.05Mpa～0.0Mpa along putting whole pressure that unlatching sequencing valve KVA-3 carries out along strideing rapid, rapid gas is put into atmosphere behind sound damper along strideing, suddenly close sequencing valve KVA-3 along strideing after finishing, opening sequencing valve KVA-5 finds time to close sequencing valve KVA-5 after evacuation step is finished to adsorption bed, open the KVB-4 sequencing valve adsorption bed carries out cutting out sequencing valve KVB-4 after the equal voltage rise of equal voltage rise is finished, open sequencing valve KVA-1 then and utilize pressurized air that adsorption bed is carried out the pressurising step.Finish once circulation thus, the above-mentioned working cycle that hockets of two adsorption beds.Can obtain product nitrogen gas continuously.The purity of product nitrogen gas is in 80%～99.9% scope.
Embodiment 3: utilize 1 the transformation absorption nitrogen production by air separation device of the present invention along the journey of releasing, its technical process as shown in Figure 3:
Transformation of the present invention absorption nitrogen production by air separation device is made of 2 adsorption towers that are filled with carbon molecular sieve adsorbent and 1 pressurized air surge tank and 1 vacuum tank of 1 product nitrogen gas surge tank and corresponding pipeline and sequencing valve and vacuum pump.The pressurized air of 0.6Mpa enters this device after the cooling driers dehydration, pressurized air enters adsorption bed from top to bottom by sequencing valve KVA-1 behind the air cushioning jar, airborne oxygen is adsorbed the carbonaceous molecular sieve absorption of loading in the bed, product nitrogen gas from the adsorption bed lower end after sequencing valve KVA-2 and pipeline enter the product nitrogen gas surge tank take-off equipment.Close KVA-1 after being adsorbed onto certain hour, the KVA-2 sequencing valve is finished adsorption step, it is 0.28Mpa that unlatching KV-4 sequencing valve all presses step all to press whole pressure, close sequencing valve KV-4 after all pressing step to finish, it is 0.05Mpa～0.0Mpa along putting whole pressure that unlatching sequencing valve KVA-3 carries out along strideing rapid, rapid gas is put into atmosphere behind sound damper along strideing, suddenly close sequencing valve KVA-3 along strideing after finishing, opening sequencing valve KVA-5 finds time to close sequencing valve KVA-5 after evacuation step is finished to adsorption bed, open the KV-4 sequencing valve adsorption bed carries out cutting out sequencing valve KV-4 after the equal voltage rise of equal voltage rise is finished, open sequencing valve KVA-1 and sequencing valve KVA-2 sequencing valve then and utilize the nitrogen in pressurized air and the product gas surge tank that adsorption bed is carried out the pressurising step.Finish once circulation thus, the above-mentioned working cycle that hockets of two adsorption beds.Can obtain product nitrogen gas continuously.The purity of product nitrogen gas is in 80%～99.9% scope.
Transformation of the present invention absorption nitrogen production by air separation device is made of 2 adsorption towers that are filled with carbon molecular sieve adsorbent and 1 pressurized air surge tank and 1 vacuum tank of 1 product nitrogen gas surge tank and corresponding pipeline and sequencing valve and vacuum pump.The pressurized air of 0.2Mpa enters this device after the cooling driers dehydration, pressurized air enters adsorption bed from top to bottom by sequencing valve KVA-1 behind the air cushioning jar, airborne oxygen is adsorbed the carbonaceous molecular sieve absorption of loading in the bed, product nitrogen gas from the adsorption bed lower end after sequencing valve KVA-2 and pipeline enter the product nitrogen gas surge tank take-off equipment.Close KVA-1 after being adsorbed onto certain hour, the KVA-2 sequencing valve is finished adsorption step, it is 0.075Mpa that unlatching KV-4 sequencing valve all presses step all to press whole pressure, close sequencing valve KV-4 after all pressing step to finish, it is 0.05Mpa～0.0Mpa along putting whole pressure that unlatching sequencing valve KVA-3 carries out along strideing rapid, rapid gas is put into atmosphere behind sound damper along strideing, suddenly close sequencing valve KVA-3 along strideing after finishing, opening sequencing valve KVA-5 finds time to close sequencing valve KVA-5 after evacuation step is finished to adsorption bed, open the KV-4 sequencing valve adsorption bed carries out cutting out sequencing valve KV-4 after the equal voltage rise of equal voltage rise is finished, open sequencing valve KVA-1 then and utilize pressurized air that adsorption bed is carried out the pressurising step.Finish once circulation thus, the above-mentioned working cycle that hockets of two adsorption beds.Can obtain product nitrogen gas continuously.The purity of product nitrogen gas is in 80%～99.9% scope.
Claims (10)
1, a kind of method of transformation absorption nitrogen production by air separation, it is characterized in that: this method is applied in the pressure swing adsorption system of two adsorption beds that are filled with carbon molecular sieve adsorbent at least, and the each run of adsorption bed comprises: absorption, all pressure drops, forward put pressures, find time, equal voltage rise, pressurising step; Press step to make the air flow line that in absorption, desorption process, passes through adsorption bed consistent by forward putting, above step cycle operation with finding time at adsorption bed nitrogen outlet end.
2, according to the method for the described transformation of claim 1 absorption nitrogen production by air separation, it is characterized in that: pressurized air 0.1～2.0Mpa by on from entering the adsorption bed that is filled with carbonaceous molecular sieve down, obtain product nitrogen gas from the adsorption bed lower end, finish adsorption step.
3, according to the method for the described transformation absorption of claim 1 nitrogen production by air separation, it is characterized in that: open the sequencing valve on adsorption bed lower end and another adsorption bed connecting tube after absorption is finished, make gas enter another adsorption bed and carry out equal voltage drop step by the adsorption bed lower end.
4, the method for adsorbing nitrogen production by air separation according to the described transformation of claim 1, it is characterized in that: the described pressure step of forward putting, the sequencing valve of opening the adsorption bed lower end is put into atmosphere with gas after by pipeline and sourdine, make the air flow line unanimity of passing through adsorption bed in whole adsorption process, forward putting pressure pressure is 0.05～0Mpa.
5, according to the method for the described transformation of claim 1 absorption nitrogen production by air separation, it is characterized in that: adopt vacuum pump that the adsorption bed of forward putting after the pressure is found time, vacuum pressure is controlled at 0～-the 0.09Mpa scope in.
6, according to the method for the described transformation of claim 1 absorption nitrogen production by air separation, it is characterized in that: enter adsorption bed by the gas of the equal pressure drop of another adsorption bed after finding time to finish and carry out equal voltage rise.
7, according to the method for the described transformation of claim 1 absorption nitrogen production by air separation, it is characterized in that: utilize pressurized air from the adsorption bed upper end or utilize product nitrogen gas adsorption bed to be pressurized to adsorptive pressure simultaneously from the adsorption bed lower end.
8, according to the method for the described transformation absorption of claim 1 nitrogen production by air separation, it is characterized in that: compressed air inlet is in the adsorption bed upper end, and product nitrogen gas exports in the adsorption bed lower end, and adsorption step is with equal pressure drop and forward put pressure step air flow line all from top to bottom.
9, according to the method for claim 1 or 3 described transformations absorption nitrogen production by air separation, it is characterized in that: above-mentioned equal voltage drop step is opened the sequencing valve on adsorption bed lower end and another adsorption bed upper end connecting tube, makes gas carry out equal pressure drop by the upper end that the adsorption bed lower end enters another adsorption bed;
10, according to the method for claim 1 or 3 described transformations absorption nitrogen production by air separation, it is characterized in that: or the sequencing valve on unlatching adsorption bed lower end and another adsorption bed lower end connecting tube, equal pressure drop is carried out in the lower end that makes gas enter another adsorption bed from the adsorption bed lower end.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101721880A (en) * | 2008-10-20 | 2010-06-09 | 太平洋联合工业公司 | Vsa gas concentrator using a reversing blower |
| CN102091501A (en) * | 2011-01-27 | 2011-06-15 | 四川同盛科技有限责任公司 | Upper and lower pressure-equalizing pressure swing adsorption method |
| CN103641102A (en) * | 2013-12-24 | 2014-03-19 | 上海同助化工科技有限公司 | Preparation method of coke oven gas debenzolization agent |
| CN104193606A (en) * | 2014-09-28 | 2014-12-10 | 中国科学院山西煤炭化学研究所 | Technique for preparing acetone from synthetic gas |
| CN105692570A (en) * | 2016-03-11 | 2016-06-22 | 北京市飞达捷能气体分离技术有限公司 | Pressure swing adsorption nitrogen making device capable of replacing membrane separation nitrogen making |
| CN107485967A (en) * | 2017-09-06 | 2017-12-19 | 江苏昊泰气体设备科技有限公司 | A kind of low pressure swing adsorption oxygen generating system and its operating method repeatedly alternately pressed with pressurising |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1063095C (en) * | 1996-03-22 | 2001-03-14 | 杨皓 | Six-tower vacuum adsorption gas separating technology |
| CN1075394C (en) * | 1997-05-29 | 2001-11-28 | 伍仁兴 | Variable-pressure adsorption process for removing CO2 from transformation gas |
| US6471744B1 (en) * | 2001-08-16 | 2002-10-29 | Sequal Technologies, Inc. | Vacuum-pressure swing absorption fractionator and method of using the same |
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2004
- 2004-11-22 CN CNB2004100812814A patent/CN100363086C/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101721880A (en) * | 2008-10-20 | 2010-06-09 | 太平洋联合工业公司 | Vsa gas concentrator using a reversing blower |
| CN102091501A (en) * | 2011-01-27 | 2011-06-15 | 四川同盛科技有限责任公司 | Upper and lower pressure-equalizing pressure swing adsorption method |
| CN103641102A (en) * | 2013-12-24 | 2014-03-19 | 上海同助化工科技有限公司 | Preparation method of coke oven gas debenzolization agent |
| CN104193606A (en) * | 2014-09-28 | 2014-12-10 | 中国科学院山西煤炭化学研究所 | Technique for preparing acetone from synthetic gas |
| CN105692570A (en) * | 2016-03-11 | 2016-06-22 | 北京市飞达捷能气体分离技术有限公司 | Pressure swing adsorption nitrogen making device capable of replacing membrane separation nitrogen making |
| CN107485967A (en) * | 2017-09-06 | 2017-12-19 | 江苏昊泰气体设备科技有限公司 | A kind of low pressure swing adsorption oxygen generating system and its operating method repeatedly alternately pressed with pressurising |
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Address after: High tech Zone Gaopeng road in Chengdu city of Sichuan province 610041 No. 5 Chengdu hi tech Zone Innovation Service Center Patentee after: Haohua Chemical Technology Group Co.,Ltd. Address before: 445 box 610225, Airport Road, Sichuan, Chengdu Patentee before: SICHUAN TIANYI SCIENCE AND TECHNOLOGY Co.,Ltd. |
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Effective date of registration: 20200421 Address after: No. 5 high tech Zone Gaopeng road in Chengdu city of Sichuan Province in 610041 Patentee after: SOUTHWEST RESEARCH & DESIGN INSTITUTE OF CHEMICAL INDUSTRY Address before: High tech Zone Gaopeng road in Chengdu city of Sichuan province 610041 No. 5 Chengdu hi tech Zone Innovation Service Center Patentee before: Haohua Chemical Technology Group Co.,Ltd. |
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