CN208204540U - Nitrogen recycling system in a kind of polypropylene production process - Google Patents
Nitrogen recycling system in a kind of polypropylene production process Download PDFInfo
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- CN208204540U CN208204540U CN201820711978.2U CN201820711978U CN208204540U CN 208204540 U CN208204540 U CN 208204540U CN 201820711978 U CN201820711978 U CN 201820711978U CN 208204540 U CN208204540 U CN 208204540U
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- nitrogen
- control valve
- recycling
- air intake
- analysis sample
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/45—Hydrogen technologies in production processes
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Abstract
The utility model provides nitrogen recycling system in a kind of polypropylene production process, and system includes that nitrogen inlet duct road, the first three-way magnetic valve, the second three-way magnetic valve, hydrogen concentration in-line analyzer, hydrocarbon concentration in-line analyzer, emptying control valve, air intake control valve, first pressure feedback system, nitrogen buffer tank, new nitrogen air intake control valve, safety vent pipeline, the new nitrogen air inlet pipe of pipe network, recycling nitrogen utilize pipeline, the first on-line analysis sample connection and the second on-line analysis sample connection.The recovery system uses hydrogen concentration in-line analyzer, hydrocarbon concentration in-line analyzer, first pressure feedback system and second pressure feedback system interlocked control, it can aid in system coordination control by interlocked control, realize the uninterrupted lasting output of passing nitrogen.
Description
Technical field
The utility model relates to a kind of nitrogen recycling system, nitrogen recycling system in especially a kind of polypropylene production process
System.
Background technique
The exhaust gas recovery system of country's intermittent liquid phase bulk polymerization polypropylene plant mostly uses greatly membrane separation technique at present, uses
Membrane separation technique can effectively recycle a part of propylene, and propylene in the gas finally discharged (containing a small amount of propane) total content about 10~
15%.In recent years, pressure swing adsorption is used for tail gas propylene recovery by polypropylene producers in the industry of part, and effect is preferable,
Tail gas propylene content can reach 0.5% or less after pressure-variable adsorption.To further decrease tail gas propylene concentration of emission, propylene is reduced
The wasting of resources improves propylene recovery amount, and pressure swing adsorption recovery unit can be used for the depth recycling of tail gas propylene.
Recycling of the pressure-swing absorption apparatus for the tail gas propylene of polypropylene production process, while propylene recovery is got off,
The a large amount of nitrogen contained in tail gas are also separated.Since nitrogen reuse difficulty is larger, traditional nitrogen recycling technique is general
Using compressor carry out pressure recovery, not only increase investment, but also recycle operating cost it is higher, nitrogen recycling economy not
In apparent situation, general producer is handled by the way of direct emission.It is raw it is therefore desirable to design a kind of polypropylene
Nitrogen recycling system preferably resolves this problem during production.
Utility model content
The purpose of this utility model is that: nitrogen recycling system is provided in a kind of polypropylene production process to realize poly- third
The nitrogen generated in alkene production process is recycled.
In order to solve the above-mentioned technical problem, the utility model provides nitrogen recycling system in a kind of polypropylene production process
System, including nitrogen inlet duct road, the first three-way magnetic valve, the second three-way magnetic valve, hydrogen concentration in-line analyzer, hydrocarbon concentration are online
Analyzer, emptying control valve, air intake control valve, first pressure feedback system, nitrogen buffer tank, new nitrogen air intake control valve, safety
The new nitrogen air inlet pipe of blowdown piping, pipe network, recycling nitrogen utilize pipeline, the first on-line analysis sample connection and the second on-line analysis
Sample connection；Nitrogen inlet duct road, safety vent pipeline, the new nitrogen air inlet pipe of pipe network and recycling nitrogen are connected to using pipeline
The top of nitrogen buffer tank；Air intake control valve is serially connected in nitrogen inlet duct road；The connection setting of first on-line analysis sample connection
On nitrogen inlet duct road；Second on-line analysis sample connection connection setting is in recycling nitrogen using on pipeline；One or three is powered
First branch pipe of magnet valve is connected with the first on-line analysis sample connection, and the first branch pipe of the second three-way magnetic valve and second is online
Analytical sampling interface is connected；Second branch pipe of the second branch pipe of the first three-way magnetic valve and the second three-way magnetic valve is and hydrogen
The acquisition input port piping connection of concentration in-line analyzer；The third branch pipe and the second three-way magnetic valve of first three-way magnetic valve
Third branch pipe with the acquisition input port piping connection of hydrocarbon concentration in-line analyzer；Control valve is vented by piping connection in nitrogen
Between gas air inlet pipeline and safety vent pipeline；First pressure feedback system is mounted on nitrogen inlet duct road, for detecting nitrogen
Air pressure in gas air inlet pipeline；The control of hydrogen concentration in-line analyzer, hydrocarbon concentration in-line analyzer and first pressure feedback system
Signal output end processed is electrically connected with the control terminal of emptying control valve and air intake control valve simultaneously；New nitrogen air intake control valve concatenation
In the new nitrogen air inlet pipe of pipe network.
Further, the second pressure feedback system of air pressure in detection tank is installed at the top of nitrogen buffer tank；Second
The control signal output of pressure feedback system is electrically connected with the control terminal of new nitrogen air intake control valve.
Further, safety relief device is serially connected on safety vent pipeline.
The utility model has the beneficial effects that: using hydrogen concentration in-line analyzer, hydrocarbon concentration in-line analyzer, the first pressure
Force feedback system and second pressure feedback system interlocked control, can aid in system coordination control by interlocked control,
Realize the uninterrupted lasting output of passing nitrogen.
Detailed description of the invention
Fig. 1 is the system structure diagram of the utility model.
Specific embodiment
As shown in Figure 1, nitrogen recycling system in polypropylene production process provided by the utility model, including nitrogen inlet duct
Road 1, the first three-way magnetic valve 2, the second three-way magnetic valve 3, hydrogen concentration in-line analyzer 4, hydrocarbon concentration in-line analyzer 5, emptying
Control valve 6, air intake control valve 7, first pressure feedback system 8, nitrogen buffer tank 9, new nitrogen air intake control valve 12, safety vent pipe
Road 13, the new nitrogen air inlet pipe 14 of pipe network, recycling nitrogen utilize pipeline 15, the first on-line analysis sample connection 16 and second online point
Analyse sample connection 17；Nitrogen inlet duct road 1, safety vent pipeline 13, the new nitrogen air inlet pipe 14 of pipe network and recycling nitrogen utilize pipe
Road 15 is connected to the top of nitrogen buffer tank 9；Air intake control valve 7 is serially connected on nitrogen inlet duct road 1；First on-line analysis takes
The connection of sample interface 16 is arranged on nitrogen inlet duct road 1；Second on-line analysis sample connection 17 connection setting is in recycling nitrogen benefit
With on pipeline 15；First branch pipe of the first three-way magnetic valve 2 is connected with the first on-line analysis sample connection 16, and the two or three is powered
First branch pipe of magnet valve 3 is connected with the second on-line analysis sample connection 17；Second branch pipe of the first three-way magnetic valve 2 and
Second branch pipe of two three-way magnetic valves 3 with the acquisition input port piping connection of hydrogen concentration in-line analyzer 4；First threeway electromagnetism
The third branch pipe of the third branch pipe of valve 2 and the second three-way magnetic valve 3 is managed with the acquisition input port of hydrocarbon concentration in-line analyzer 5
Road connection；It is vented control valve 6 and passes through piping connection between nitrogen inlet duct road 1 and safety vent pipeline 13；First pressure is anti-
Feedback system 8 is mounted on nitrogen inlet duct road 1, for detecting the air pressure in nitrogen inlet duct road 1；Hydrogen concentration in-line analyzer 4,
The control signal output of hydrocarbon concentration in-line analyzer 5 and first pressure feedback system 8 simultaneously with emptying control valve 6 and
The control terminal of air intake control valve 7 is electrically connected；New nitrogen air intake control valve 12 is serially connected in the new nitrogen air inlet pipe 14 of pipe network.
Fresh nitrogen from the new nitrogen air inlet pipe of pipe network passes through fresh nitrogen air intake control valve 12 and second pressure feedback system
System 11 enters nitrogen buffer tank 9 after controlling to adjust, can be in the rich nitrogen on the nitrogen inlet duct road 1 from pressure swing adsorption recovery unit
In the underproof situation of gas, the pressure of the process system is supplemented, is allowed to maintain within the scope of technique required pressure, and can pass through
Fresh nitrogen is supplemented, the flammable Gas content of system is reduced, guarantees that the flammable Gas content of the second on-line analysis sample connection 17 is qualified, from
And guarantee that it is qualified for entering recycling nitrogen using the nitrogen of pipeline 15.
In connecting line: nitrogen inlet duct road 1 is inputted for being connected with the gas outlet from pressure swing adsorption recovery unit
Rich nitrogen；Safety vent pipeline 13 releases rich nitrogen for being connected with safety vent system；The new nitrogen air inlet pipe 14 of pipe network is used for
It is connected with pipe network fresh nitrogen system, inputs fresh nitrogen；Recycling nitrogen utilizes pipeline 15 for utilizing system with recycling nitrogen
System is connected, the recycling and reusing for nitrogen.
Further, the second pressure feedback system 11 of air pressure in detection tank is installed at the top of nitrogen buffer tank 9；The
The control signal output of two pressure feedback systems 11 is electrically connected with the control terminal of new nitrogen air intake control valve 12.In safety vent pipe
Safety relief device 10 is serially connected on road 13.
In polypropylene production process provided by the utility model in nitrogen recycling system, hydrogen concentration in-line analyzer 4 and hydrocarbon
Concentration in-line analyzer 5 is all made of existing conventional in-line analyzer；First pressure feedback system 8 and second pressure feedback system
11 are all made of existing normal pressures feedback system；Safety relief device 10 uses existing convention security bleeder.
Nitrogen recycling system includes the following steps: at work in the polypropylene production process
Combustible gas monitoring step: nitrogen inlet duct road 1 is connect to introducing richness with the escape pipe of pressure swing adsorption recovery unit
Nitrogen, rich nitrogen enter hydrogen concentration in-line analyzer 4 and hydrocarbon concentration by the first three-way magnetic valve 2 and the second three-way magnetic valve 3
In-line analyzer 5 obtains the combustible gas at the first on-line analysis sample connection 16 and the second on-line analysis sample connection 17 in real time
Body content is then considered as qualification if fuel gas content data and being less than or equal to 1.5% (V/V, volume ratio) at two, and by rich nitrogen
Gas enters nitrogen buffer tank 9 by air intake control valve 7；If at two fuel gas content data and be greater than 1.5% (V/V), depending on
To be unqualified, and rich nitrogen is entered into safety vent pipeline 13 by emptying control valve 6；
Pressure monitoring step: the air pressure on 8 real-time detection nitrogen inlet duct road 1 of first pressure feedback system, when the first pressure
When the feedback pressure of force feedback system 8 is more than 0.6MPa, be then vented 6 standard-sized sheet of control valve, air intake control valve 7 closes entirely, rich nitrogen into
Enter safety vent pipeline 13, guarantees the safety of system；When the feedback pressure of first pressure feedback system 8 is lower than 0.5MPa,
It is vented control valve 6 to close entirely, 7 standard-sized sheet of air intake control valve guarantees system pressure；When the feedback pressure of first pressure feedback system 8 exists
When 0.5~0.6MPa, be vented control valve 6 and air intake control valve 7 and enter aperture regulation state, with maintain system pressure 0.5~
Within the scope of 0.6MPa；
Air pressure adjustment step in tank: rich nitrogen enters back after entering nitrogen buffer tank 9 through the storage of nitrogen buffer tank 9, buffering
It receives nitrogen and utilizes pipeline 15, for recycling；The second pressure feedback system 11 being connected with nitrogen buffer tank 9 and nitrogen air inlet control
Valve 12 adjusts the pressure in nitrogen buffer tank 9 in real time: when the detection pressure of second pressure feedback system 11 is lower than 0.45MPa,
Then new 12 standard-sized sheet of nitrogen air intake control valve, fresh nitrogen of the supplement from the new nitrogen air inlet pipe 14 of pipe network enters nitrogen buffer tank 9, with dimension
The normally-pressured neighbor of nitrogen buffer tank 9 is held, guarantees that recycling nitrogen utilizes the normal output of pipeline 15；It is fed back when second pressure and is
When the detection pressure of system 11 is higher than 0.55MPa, then new nitrogen air intake control valve 12 closes entirely, to guarantee the safety of system；When second
For the detection pressure of pressure feedback system 11 in 0.45~0.55MPa, then new nitrogen air intake control valve 12 enters aperture regulation state,
To maintain the normally-pressured neighbor of nitrogen buffer tank 9, guarantee that recycling nitrogen utilizes the normal output of pipeline 15；
Safety relief step: the atmospheric pressure value in nitrogen buffer tank 9 is controlled by safety relief device 10, in nitrogen buffer tank 9
When pressure is more than 0.66MPa, safety relief device 10 is opened, and pressure in nitrogen buffer tank 9 is let out toward safety vent pipeline 13；
Combustible gas monitoring step, pressure monitoring step, air pressure adjustment step and safety relief step are parallel in tank
Operating procedure.It can ensure that system order is run using parallel operation, export qualified nitrogen.
In hydrogen concentration in-line analyzer 4 and hydrocarbon concentration in-line analyzer 5 to on-line analysis sample connection 16 and online point
When the flammable gas concentration of analysis sample connection 17 is tested and analyzed, the state at on-line analysis sample connection 16 is first tested and analyzed,
If the flammable Gas content at on-line analysis sample connection 16 is lasting unqualified, i.e. hydrogen concentration in-line analyzer 4 and hydrocarbon concentration is online
The fuel gas content data that analyzer 5 detects and the time more than 1.5% (V/V) are more than 5 minutes, then switch to again online
It is detected at analytical sampling interface 17, if the fuel gas content data detected at on-line analysis sample connection 17 continues qualification
Time after five minutes, then switches at on-line analysis sample connection 16 again and is detected, then executes the work of combustible gas monitoring step
Skill process.Using the successive measurement of on-line analysis sample connection 16 and on-line analysis sample connection 17, it is ensured that measurement it is reliable
Property.
If the fuel gas content data detected at on-line analysis sample connection 17 and the time more than 1.5% (V/V) are super
5 minutes are spent, then new 12 standard-sized sheet of nitrogen air intake control valve is controlled by second pressure feedback system 11, fresh nitrogen is made to enter nitrogen buffering
Tank 9 guarantees that the combustible gas content data at on-line analysis sample connection 17 is qualified, it is ensured that enter recycling nitrogen using pipeline 15
Nitrogen data qualifier.Using the aperture of the new nitrogen air intake control valve 12 of 11 real-time control of second pressure feedback system, to adjust nitrogen
Combustible gas content data in gas surge tank 9 guarantees that the combustible gas content data at on-line analysis sample connection 17 is qualified, it is ensured that
The nitrogen data qualifier of pipeline 15 is utilized into recycling nitrogen.
Hydrogen concentration in-line analyzer 4, hydrocarbon concentration in-line analyzer 5, first pressure feedback system 8 and second pressure feedback
11 interlocked control of system.It can aid in system coordination control by interlocked control, realize that the uninterrupted of passing nitrogen continues
Output.
Claims (3)
1. nitrogen recycling system in a kind of polypropylene production process, it is characterised in that: including nitrogen inlet duct road (1), the one or three
Three-way electromagnetic valve (2), the second three-way magnetic valve (3), hydrogen concentration in-line analyzer (4), hydrocarbon concentration in-line analyzer (5), emptying control
Valve (6) processed, air intake control valve (7), first pressure feedback system (8), nitrogen buffer tank (9), new nitrogen air intake control valve (12), peace
Full blowdown piping (13), the new nitrogen air inlet pipe (14) of pipe network, recycling nitrogen utilize pipeline (15), the first on-line analysis sample connection
(16) and the second on-line analysis sample connection (17)；Nitrogen inlet duct road (1), safety vent pipeline (13), the new nitrogen of pipe network into
Tracheae (14) and recycling nitrogen are connected to the top of nitrogen buffer tank (9) using pipeline (15)；Air intake control valve (7) concatenation
On nitrogen inlet duct road (1)；The connection of first on-line analysis sample connection (16) is arranged on nitrogen inlet duct road (1)；Second
On-line analysis sample connection (17) connection setting is in recycling nitrogen using on pipeline (15)；The first of first three-way magnetic valve (2)
Branch pipe is connected with the first on-line analysis sample connection (16), and the first branch pipe of the second three-way magnetic valve (3) and second divides online
Analysis sample connection (17) is connected；Second of second branch pipe of the first three-way magnetic valve (2) and the second three-way magnetic valve (3)
The acquisition input port piping connection of Guan Junyu hydrogen concentration in-line analyzer (4)；The third branch pipe of first three-way magnetic valve (2) and
The third branch pipe of second three-way magnetic valve (3) with the acquisition input port piping connection of hydrocarbon concentration in-line analyzer (5)；Emptying control
Valve (6) processed is by piping connection between nitrogen inlet duct road (1) and safety vent pipeline (13)；First pressure feedback system
(8) it is mounted on nitrogen inlet duct road (1), for detecting the air pressure in nitrogen inlet duct road (1)；Hydrogen concentration in-line analyzer
(4), the control signal output of hydrocarbon concentration in-line analyzer (5) and first pressure feedback system (8) is controlled with emptying simultaneously
The electrical connection of the control terminal of valve (6) processed and air intake control valve (7)；New nitrogen air intake control valve (12) is serially connected in the new nitrogen air inlet pipe of pipe network
(14) on.
2. nitrogen recycling system in polypropylene production process according to claim 1, it is characterised in that: in nitrogen buffer tank
(9) the second pressure feedback system (11) of air pressure in detection tank is installed at the top of；The control of second pressure feedback system (11)
Signal output end is electrically connected with the control terminal of new nitrogen air intake control valve (12).
3. nitrogen recycling system in polypropylene production process according to claim 2, it is characterised in that: in safety vent pipe
Safety relief device (10) are serially connected on road (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820711978.2U CN208204540U (en) | 2018-05-14 | 2018-05-14 | Nitrogen recycling system in a kind of polypropylene production process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820711978.2U CN208204540U (en) | 2018-05-14 | 2018-05-14 | Nitrogen recycling system in a kind of polypropylene production process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208204540U true CN208204540U (en) | 2018-12-07 |
Family
ID=64520855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820711978.2U Withdrawn - After Issue CN208204540U (en) | 2018-05-14 | 2018-05-14 | Nitrogen recycling system in a kind of polypropylene production process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208204540U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108426170A (en) * | 2018-05-14 | 2018-08-21 | 南京金陵塑胶化工有限公司 | Nitrogen recycling system and its recovery process in a kind of polypropylene production process |
| CN111594756A (en) * | 2020-05-29 | 2020-08-28 | 南京金陵塑胶化工有限公司 | Recovery system of nitrogen gas in polypropylene production process |
| CN114768489A (en) * | 2022-03-25 | 2022-07-22 | 国家能源集团宁夏煤业有限责任公司 | Method and system for trapping propylene in polypropylene tail gas |
-
2018
- 2018-05-14 CN CN201820711978.2U patent/CN208204540U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108426170A (en) * | 2018-05-14 | 2018-08-21 | 南京金陵塑胶化工有限公司 | Nitrogen recycling system and its recovery process in a kind of polypropylene production process |
| CN108426170B (en) * | 2018-05-14 | 2023-10-20 | 南京金陵塑胶化工有限公司 | Nitrogen recovery system and process in polypropylene production process |
| CN111594756A (en) * | 2020-05-29 | 2020-08-28 | 南京金陵塑胶化工有限公司 | Recovery system of nitrogen gas in polypropylene production process |
| CN114768489A (en) * | 2022-03-25 | 2022-07-22 | 国家能源集团宁夏煤业有限责任公司 | Method and system for trapping propylene in polypropylene tail gas |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20181207 Effective date of abandoning: 20231020 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20181207 Effective date of abandoning: 20231020 |