CN111217341A - A kind of PSA nitrogen making system technological process - Google Patents

A kind of PSA nitrogen making system technological process Download PDF

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Publication number
CN111217341A
CN111217341A CN202010223262.XA CN202010223262A CN111217341A CN 111217341 A CN111217341 A CN 111217341A CN 202010223262 A CN202010223262 A CN 202010223262A CN 111217341 A CN111217341 A CN 111217341A
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tower
valve
gas outlet
branch pipe
nitrogen
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林宏洪
崔文朋
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Jiangsu Qingyue Gas Technology Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B21/00Nitrogen; Compounds thereof
    • C01B21/04Purification or separation of nitrogen
    • C01B21/0405Purification or separation processes
    • C01B21/0433Physical processing only
    • C01B21/045Physical processing only by adsorption in solids
    • C01B21/0455Physical processing only by adsorption in solids characterised by the adsorbent
    • C01B21/0472Other molecular sieve materials
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2210/00Purification or separation of specific gases
    • C01B2210/0001Separation or purification processing
    • C01B2210/0009Physical processing
    • C01B2210/0014Physical processing by adsorption in solids
    • C01B2210/0015Physical processing by adsorption in solids characterised by the adsorbent
    • C01B2210/002Other molecular sieve materials

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  • Separation Of Gases By Adsorption (AREA)

Abstract

本发明公开了一种PSA制氮系统工艺流程,包括两个并联设置的吸附塔A和吸附塔B,所述吸附塔A和吸附塔B分别通过进气支管A和进气支管B与进气总管连接,所述进气总管一端设置有空气入口,所述进气支管A和进气支管B上分别设置有A塔进气阀和B塔进气阀,所述吸附塔A和吸附塔B分别通过出气支管A和出气支管B与出气总管连接,所述出气总管一端与氮气缓冲罐连接,所述出气支管A和出气支管B上分别设置有A塔出气阀和B塔出气阀,所述吸附塔A和吸附塔B均与上均压阀连接并分别与A塔中下均压阀和B塔中下均压阀连接,所述吸附塔A和吸附塔B分别与A塔放空阀和B塔放空阀连接,能够提高制氮效率的同时降低能耗。

Figure 202010223262

The invention discloses a process flow of a PSA nitrogen production system, which includes two parallel-arranged adsorption towers A and B, wherein the adsorption towers A and B are connected to the intake air through an intake branch pipe A and an intake branch pipe B respectively. The main pipe is connected, one end of the intake manifold is provided with an air inlet, the intake branch pipe A and the intake branch pipe B are respectively provided with an A tower intake valve and a B tower intake valve, the adsorption tower A and the adsorption tower B The gas outlet branch pipe A and the gas outlet branch pipe B are respectively connected with the gas outlet main pipe, and one end of the gas outlet main pipe is connected with the nitrogen buffer tank. Both the adsorption tower A and the adsorption tower B are connected with the upper pressure equalizing valve and are respectively connected with the middle and lower pressure equalizing valve in the A tower and the middle and lower pressure equalizing valve in the B tower, and the adsorption tower A and the adsorption tower B are respectively connected with the A tower vent valve and B tower vent valve connection can improve nitrogen production efficiency and reduce energy consumption.

Figure 202010223262

Description

PSA nitrogen production system process flow
Technical Field
The invention relates to the field of nitrogen production, in particular to a PSA nitrogen production system process flow.
Background
With the economic development, nitrogen is widely used as an inert gas in the processes of inert protection of flammable and explosive materials, oxidation prevention of special materials, nitrogen filling and oxygen discharging of storage tanks and containers, fine chemical engineering, petrochemical engineering and the like. Industrial nitrogen production is mainly achieved by separating air. At present, there are three methods for producing nitrogen, namely, a cryogenic process, a Pressure Swing Adsorption (PSA) process and a membrane process. The cryogenic air separation method is used for liquefying air and rectifying the liquefied air to prepare nitrogen, and is suitable for large-scale production; the membrane air separation method has high requirements on the cleanness of compressed air, the filter element of the membrane is easy to age and corrode to lose efficacy, the membrane is difficult to repair, and the cost for replacing a new membrane is high; compared with the prior art, the PSA nitrogen production method has the advantages of simple process flow, high automation degree, quick start, small volume, quick gas production, low energy consumption, low operation cost, low investment and simple operation and maintenance, and the PSA nitrogen production method has obvious advantages within the nitrogen production capacity of less than 3000-5000 Nm 3/h.
The PSA nitrogen making method uses pressure as a circulating variable to separate a gas mixture, a pressure equalizing technology is commonly used in the PSA nitrogen making technology for desorption at present, the existing pressure equalizing technology generally adopts an upper pressure equalizing mode and a lower pressure equalizing mode, but the gas distribution purity in an adsorption tower is easy to be unequal, and gas transfer is carried out under the condition, so that the use efficiency of a molecular sieve is reduced, the greater purity fluctuation after the adsorption tower is switched is easy to cause, and the integral high energy consumption and low efficiency of the system are caused.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide a process flow of a PSA (pressure swing adsorption) nitrogen making system, which can improve the nitrogen making efficiency and reduce the energy consumption.
In order to achieve the above purposes, the invention adopts the technical scheme that: a PSA nitrogen-making system process flow comprises two parallel adsorption towers A and B, the adsorption tower A and the adsorption tower B are respectively connected with an air inlet main pipe through an air inlet branch pipe A and an air inlet branch pipe B, an air inlet is arranged at one end of the air inlet main pipe, an A tower air inlet valve and a B tower air inlet valve are respectively arranged on the air inlet branch pipe A and the air inlet branch pipe B, the adsorption tower A and the adsorption tower B are respectively connected with the gas outlet main pipe through a gas outlet branch pipe A and a gas outlet branch pipe B, one end of the gas outlet main pipe is connected with the nitrogen buffer tank, the gas outlet branch pipe A and the gas outlet branch pipe B are respectively provided with a tower A gas outlet valve and a tower B gas outlet valve, adsorption tower A and adsorption tower B all are connected with last equalizer valve and are connected with equalizer valve under in A tower and the B tower respectively, adsorption tower A and adsorption tower B are connected with A tower atmospheric valve and B tower atmospheric valve respectively.
The invention provides a PSA nitrogen making system process flow, which has the beneficial effects that: connect adsorption tower A and adsorption tower B with last equalizer valve to set up the equalizer valve under in the A tower on the branch pipe of being connected with adsorption tower A, set up equalizer valve under in the B tower on the branch pipe of being connected with adsorption tower B, concentration gradient when guaranteeing voltage-sharing process gas and shifting improves molecular sieve's actual utilization efficiency effectively, and with reasonable gas transfer mode, make the purity fluctuation of adsorption tower switching back gas reduce greatly, improve the overall efficiency of system, reduce the power consumption.
Further, be provided with filter equipment on the inlet manifold, be provided with the active carbon filter layer in the filter equipment, avoid impurity to get into in the adsorption tower.
Furthermore, tower A atmospheric valve and tower B atmospheric valve all are connected with the muffler, reduce the noise that produces when nitrogen generator is emptied.
Further, branch pipe A and branch pipe B all are connected with the washing ball valve, utilize and wash the ball valve and wash the adsorption tower, have avoided the consumption of product nitrogen gas in the nitrogen buffer tank to guarantee product purity, thereby improved production efficiency.
Furthermore, middle and lower pressure equalizing ball valves are arranged on branch pipes where the middle and lower pressure equalizing valves in the tower A and the middle and lower pressure equalizing valves in the tower B, so that the flow regulation of gas is realized.
Further, the gas outlet of the nitrogen buffer tank is connected with the gas outlet classifying pipe, one end, far away from the nitrogen buffer tank, of the gas outlet classifying pipe is connected with the unqualified exhaust pipe and the qualified exhaust pipe respectively, and the unqualified exhaust pipe and the qualified exhaust pipe are provided with an unqualified vent valve and a qualified exhaust valve respectively to classify the produced nitrogen.
Furthermore, a nitrogen outlet flow meter is arranged on the air outlet classifying pipe, and the amount of discharged nitrogen can be monitored.
Further, nitrogen buffer tank gas outlet and nitrogen divide the appearance to pass through the sample branch connection, be provided with nitrogen gas sample relief pressure valve on the sample branch pipe, detect nitrogen gas composition to the control detection volume.
Furthermore, a nitrogen pressure reducing valve is arranged on the air outlet classifying pipe to adjust the air flow pressure.
Drawings
FIG. 1 is a process flow diagram of the present invention.
In the figure:
1-adsorption column a; 2-adsorption column B; 3-a tower inlet valve; 4-tower B air inlet valve; 5-a nitrogen buffer tank; 6-A tower gas outlet valve; 7-B tower gas outlet valve; 8-a pressure equalizing valve is arranged; a lower pressure equalizing valve in the 9-A tower; a lower pressure equalizing valve in the tower 10-B; 11-a column vent valve; 12-B tower vent valve; 13-a filtration device; 14-a silencer; 15-flushing the ball valve; 16-middle and lower pressure equalizing ball valves; 17-unqualified emptying valve; 18-nitrogen outlet flow meter; 19-azotometer; 20-nitrogen sampling pressure reducing valve; 21-nitrogen pressure reducing valve; 22-qualified exhaust valve.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
Referring to the attached figure 1, a PSA nitrogen-making system process flow comprises two adsorption towers A1 and B2 which are arranged in parallel, wherein the adsorption tower A1 and the adsorption tower B2 are respectively connected with an air inlet main through an air inlet branch pipe A and an air inlet branch pipe B, one end of the air inlet main is provided with an air inlet, the air inlet main is provided with a filtering device 13, the filtering device 13 is internally provided with an active carbon filtering layer, the air inlet branch pipe A and the air inlet branch pipe B are respectively provided with an A tower air inlet valve 3 and a B tower air inlet valve 4, the adsorption tower A1 and the adsorption tower B2 are respectively connected with an air outlet main through an air outlet branch pipe A and an air outlet branch pipe B, one end of the air outlet main is connected with a nitrogen buffer tank 5, the air outlet branch pipe A and the air outlet branch pipe B are respectively provided with an A tower air outlet valve 6 and a B tower air outlet valve 7, the adsorption tower A1 and the adsorption tower B2 are both connected with an upper pressure equalizing valve 8, a middle-lower pressure equalizing ball valve 16 is arranged on a branch pipe where a lower pressure equalizing valve 9 in the tower A and a lower pressure equalizing valve 10 in the tower B are respectively arranged, an adsorption tower A1 and an adsorption tower B2 are respectively connected with a tower A emptying valve 11 and a tower B emptying valve 12, the tower A emptying valve 11 and the tower B emptying valve 12 are both connected with a silencer 14, a gas outlet branch pipe A and a gas outlet branch pipe B are both connected with a flushing ball valve 15, when gas flows out of the adsorption tower A1 to reach the gas outlet branch pipe A, a part of the gas enters the flushing ball valve 15 and flows into the adsorption tower B2 to flush the gas, and when the gas flows out of the adsorption tower B2 to reach the gas outlet branch pipe B, a part of the gas enters the flushing ball valve 15 and flows into the adsorption tower A1 to flush the gas;
the gas outlet of the nitrogen buffer tank 5 is connected with a gas outlet classification pipe, a nitrogen outlet flow meter 18 is arranged on the gas outlet classification pipe, a nitrogen pressure reducing valve 21 is arranged on the gas outlet classification pipe, one end of the gas outlet classification pipe, far away from the nitrogen buffer tank 5, is respectively connected with an unqualified exhaust pipe and a qualified exhaust pipe, an unqualified emptying valve 17 and a qualified exhaust valve 22 are respectively arranged on the unqualified exhaust pipe and the qualified exhaust pipe, the gas outlet of the nitrogen buffer tank 5 is connected with a nitrogen analyzer 19 through a sampling branch pipe, and a nitrogen sampling pressure reducing valve 20 is arranged on the;
all the valves are electrically connected by an electromagnetic valve set.
The specific working process is as follows: air enters from an air inlet, and is primarily filtered by a filtering device 13, then an air inlet valve 3 of a tower A, an air outlet valve 6 of the tower A and a vent valve 12 of a tower B are opened, so that the air enters an adsorption tower A1 after passing through an air inlet branch pipe A from an air inlet header pipe, oxygen and nitrogen are separated by a carbon molecular sieve in an adsorption tower A1, then the air enters a nitrogen buffer tank 5 after passing through an air outlet branch pipe A through an air outlet header pipe, oxygen molecules adsorbed in an adsorption tower B2 are evacuated by the vent valve 12 of the tower B and a silencer 14 while nitrogen is produced by the adsorption tower A1, and desorption and deoxidation of the adsorption tower B2 are completed;
when the adsorption tower A1 works for a period of time and the adsorption of the carbon molecular sieve in the adsorption tower A1 to oxygen is close to saturation, closing the tower A air inlet valve 3, the tower A air outlet valve 6 and the tower B emptying valve 12, opening the upper pressure equalizing valve 8, opening the lower pressure equalizing valve 9 in the tower A after 2S, equalizing the pressure of the adsorption tower B2, and closing the upper pressure equalizing valve 8 and the lower pressure equalizing valve 9 in the tower A after equalizing the pressure;
carrying out adsorption of an adsorption tower B2 after pressure equalization, opening a tower B air inlet valve 4, a tower B air outlet valve 7 and a tower A emptying valve 11, enabling the gas to enter an adsorption tower B2 after passing through an air inlet branch pipe B from an air inlet main pipe, completing oxygen-nitrogen separation through a carbon molecular sieve in an adsorption tower B2, enabling the gas to enter a nitrogen buffer tank 5 after passing through an air outlet main pipe from an air outlet branch pipe B, and emptying oxygen molecules adsorbed in an adsorption tower A1 through the tower A emptying valve 11 and a silencer 14 while nitrogen is produced in the adsorption tower B2, thereby completing desorption and deoxidation of the adsorption tower A1;
when the adsorption tower B2 works for a period of time and the adsorption of the carbon molecular sieve in the adsorption tower B2 on oxygen is close to saturation, closing the tower B air inlet valve 4, the tower B air outlet valve 7 and the tower A emptying valve 11, opening the upper pressure equalizing valve 8, opening the lower pressure equalizing valve 10 in the tower B after 2S, equalizing the pressure of the adsorption tower A1, and closing the upper pressure equalizing valve 8 and the lower pressure equalizing valve 10 in the tower B after equalizing the pressure;
the adsorption tower A1 and the adsorption tower B2 are alternately adsorbed and desorbed, so that most of nitrogen and a small part of oxygen in the air are separated, the enriched oxygen is exhausted, the nitrogen is conveyed into a nitrogen storage tank, the concentration gradient during gas transfer in the pressure equalizing process is ensured, the actual utilization efficiency of the molecular sieve is effectively improved, the fluctuation of the purity of the gas after the adsorption towers are switched is greatly reduced in a reasonable gas transfer mode, the overall efficiency of the system is improved, and the energy consumption is reduced.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the present invention is not limited thereto, and any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.

Claims (9)

1.一种PSA制氮系统工艺流程,包括两个并联设置的吸附塔A(1)和吸附塔B(2),其特征在于:所述吸附塔A(1)和吸附塔B(2)分别通过进气支管A和进气支管B与进气总管连接,所述进气总管一端设置有空气入口,所述进气支管A和进气支管B上分别设置有A塔进气阀(3)和B塔进气阀(4),所述吸附塔A(1)和吸附塔B(2)分别通过出气支管A和出气支管B与出气总管连接,所述出气总管一端与氮气缓冲罐(5)连接,所述出气支管A和出气支管B上分别设置有A塔出气阀(6)和B塔出气阀(7),所述吸附塔A(1)和吸附塔B(2)均与上均压阀(8)连接并分别与A塔中下均压阀(9)和B塔中下均压阀(10)连接,所述吸附塔A(1)和吸附塔B(2)分别与A塔放空阀(11)和B塔放空阀(12)连接。1. a PSA nitrogen making system technological process, comprises two parallel-arranged adsorption tower A (1) and adsorption tower B (2), it is characterized in that: described adsorption tower A (1) and adsorption tower B (2) The intake manifold A and the intake manifold B are respectively connected with the intake manifold, one end of the intake manifold is provided with an air inlet, and the intake manifold A and the intake manifold B are respectively provided with an A tower intake valve (3 ) and the B tower inlet valve (4), the adsorption tower A (1) and the adsorption tower B (2) are respectively connected with the gas outlet main pipe by the gas outlet branch pipe A and the gas outlet branch pipe B, and one end of the gas outlet main pipe is connected with the nitrogen buffer tank ( 5) connection, described air outlet branch pipe A and air outlet branch pipe B are respectively provided with A tower air outlet valve (6) and B tower air outlet valve (7), and described adsorption tower A (1) and adsorption tower B (2) are all connected with The upper pressure equalizing valve (8) is connected and connected with the lower pressure equalizing valve (9) in the A tower and the lower pressure equalizing valve (10) in the B tower respectively, and the adsorption tower A (1) and the adsorption tower B (2) are respectively Connect with the A tower vent valve (11) and the B tower vent valve (12). 2.根据权利要求1所述的一种PSA制氮系统工艺流程,其特征在于:所述进气总管上设置有过滤装置(13),所述过滤装置(13)内设置有活性炭过滤层。2 . The technological process of a PSA nitrogen making system according to claim 1 , wherein a filter device ( 13 ) is arranged on the intake manifold, and an activated carbon filter layer is arranged in the filter device ( 13 ). 3 . 3.根据权利要求1所述的一种PSA制氮系统工艺流程,其特征在于:所述A塔放空阀(11)和B塔放空阀(12)均与消音器(14)连接。3. A kind of PSA nitrogen making system technological process according to claim 1, is characterized in that: described A tower vent valve (11) and B tower vent valve (12) are all connected with muffler (14). 4.根据权利要求1所述的一种PSA制氮系统工艺流程,其特征在于:所述出气支管A和出气支管B均与冲洗球阀(15)连接。4 . The process flow of a PSA nitrogen making system according to claim 1 , wherein the gas outlet branch pipe A and the gas outlet branch pipe B are both connected to the flushing ball valve ( 15 ). 5 . 5.根据权利要求1所述的一种PSA制氮系统工艺流程,其特征在于:所述A塔中下均压阀(9)和B塔中下均压阀(10)所在支管上均设置有中下均压球阀(16)。5. a kind of PSA nitrogen making system technological process according to claim 1, is characterized in that: described A tower middle and lower pressure equalizing valve (9) and B tower middle and lower pressure equalizing valve (10) are all set on the branch pipe where There are middle and lower pressure equalizing ball valves (16). 6.根据权利要求1所述的一种PSA制氮系统工艺流程,其特征在于:所述氮气缓冲罐(5)出气口与出气分类管连接,所述出气分类管远离氮气缓冲罐(5)一端分别与不合格排气管、合格排气管连接,所述不合格排气管和合格排气管上分别设置有不合格放空阀(17)、合格排气阀(22)。6. A kind of PSA nitrogen making system technological process according to claim 1, is characterized in that: described nitrogen buffer tank (5) gas outlet is connected with gas outlet classification pipe, and described gas outlet classification pipe is far away from nitrogen buffer tank (5) One end is respectively connected with the unqualified exhaust pipe and the qualified exhaust pipe, and the unqualified exhaust pipe and the qualified exhaust pipe are respectively provided with an unqualified vent valve (17) and a qualified exhaust valve (22). 7.根据权利要求6所述的一种PSA制氮系统工艺流程,其特征在于:所述出气分类管上设置有氮气出口流量表(18)。7. The technological process of a PSA nitrogen making system according to claim 6, wherein a nitrogen outlet flow meter (18) is arranged on the gas outlet classification pipe. 8.根据权利要求6所述的一种PSA制氮系统工艺流程,其特征在于:所述氮气缓冲罐(5)出气口与氮分仪(19)通过取样支管连接,所述取样支管上设置有氮气取样减压阀(20)。8. The technological process of a PSA nitrogen making system according to claim 6, wherein the gas outlet of the nitrogen buffer tank (5) is connected with the nitrogen analyzer (19) through a sampling branch pipe, and the sampling branch pipe is provided with There is a nitrogen sampling pressure reducing valve (20). 9.根据权利要求6所述的一种PSA制氮系统工艺流程,其特征在于:所述出气分类管上设置有氮气减压阀(21)。9 . The technological process of a PSA nitrogen making system according to claim 6 , wherein a nitrogen pressure reducing valve ( 21 ) is arranged on the gas outlet classification pipe. 10 .
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Publication number Priority date Publication date Assignee Title
CN111825065A (en) * 2020-07-17 2020-10-27 盖斯伊科技(苏州)有限公司 Modular nitrogen making machine
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Application publication date: 20200602