CN205485658U - Two closed loop ratio control of flow system for in PA6 production process - Google Patents
Two closed loop ratio control of flow system for in PA6 production process Download PDFInfo
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- CN205485658U CN205485658U CN201620191499.3U CN201620191499U CN205485658U CN 205485658 U CN205485658 U CN 205485658U CN 201620191499 U CN201620191499 U CN 201620191499U CN 205485658 U CN205485658 U CN 205485658U
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Abstract
The utility model discloses a two closed loop ratio control of flow system for in PA6 production process, including the vice control mechanism that a master controller constructs and the multiunit is parallelly connected, be provided with the comparator between the vice control mechanism that master controller constructs and the multiunit is parallelly connected, master controller constructs including main control unit and installs the mainstream volume derailleur on the main line, mainstream volume derailleur and main control unit signal connection, and main control unit is connected with the variable frequency speed governing(VFSG) ware, and the variable frequency speed governing(VFSG) ware is connected with the motor transport pump, vice control mechanism includes auxiliary controller and installs in looped pipeline vice flow derailleur on the road, vice flow derailleur and auxiliary controller signal connection, auxiliary controller connects the governing valve. The utility model discloses an error rate only is 0.15%, has compared obvious improvement with prior art 7.8%'s error, under the unchangeable condition of mainstream volume, driven flow is not undulant basically, and system maintenance is with low costs, and the cycle of steady operation increases, even the trouble takes place the back, the time of the production that returns to normal is very big having shortened also.
Description
Technical field
This utility model belongs to a kind of flow control system, is specifically related to a kind of flow double-close-loop ratio control system being applied in PA6 production process.
Background technology
PA6 raw material caprolactam, additive, titanium dioxide in continuous flow procedure will simultaneously enter inside pre-polymerization tower, and caprolactam, additive, titanium dioxide three's flow are different, but additive, titanium dioxide all proportional relations with the flow of caprolactam, the most once caprolactam main flow changes, and additive, the flow of titanium dioxide also can change the most therewith.In actual production caprolactam main flow one timing, additive, titanium dioxide actual flow fluctuation ratio bigger；When caprolactam main flow has fluctuation additive, titanium dioxide driven flowed fluctuation relatively big and governing speed is relatively slow, arrive the steady statue time longer, less stable, product quality is caused large effect.
Utility model content
This utility model proposes to overcome shortcoming present in prior art, its objective is to provide a kind of flow double-close-loop ratio control system being applied in PA6 production process.
The technical solution of the utility model is:
A kind of flow double-close-loop ratio control system being applied in PA6 production process, is provided with comparator including between the sub-control mechanism that the sub-control mechanism that a main control mechanism and many groups are in parallel, main control mechanism and many groups are in parallel；Main control mechanism includes master controller and the main flow variator being installed on main line, and main flow variator is connected with master controller signal, and master controller is connected with variable-frequency governor, and variable-frequency governor is connected with motor delivery pump；Sub-control mechanism includes submaster controller and the sidestream amount variator being installed on looped pipeline road；Sidestream amount variator is connected with submaster controller signal, and submaster controller connects regulation valve.
Described master controller and submaster controller all use PLC；Main flow variator and sidestream amount variator all use Siemens's mass flowmenter.
The beneficial effects of the utility model are:
Error rate of the present utility model is only 0.15%, significantly improves compared with the error of prior art 7.8%；In the case of main flow is constant, driven flow there is no fluctuation, and system maintenance low cost, the cycle of equipment stable operation significantly increases, even if after fault occurs, the time returned to normal production shortens the most greatly.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Wherein:
1 master controller 2 submaster controller
3 comparators 4
Variable-frequency governor
5 motor delivery pumps 6 regulate valve.
Detailed description of the invention
The flow double-close-loop ratio control system being applied to this utility model in PA6 production process below in conjunction with Figure of description and embodiment is described in detail:
As it is shown in figure 1, a kind of flow double-close-loop ratio control system being applied in PA6 production process, it is provided with comparator 3 including between the sub-control mechanism that the sub-control mechanism that a main control mechanism and many groups are in parallel, main control mechanism and many groups are in parallel；Main control mechanism includes master controller 1 and the main flow variator being installed on main line, and main flow variator is connected with master controller 1 signal, and master controller 1 is connected with variable-frequency governor 4, and variable-frequency governor 4 is connected with motor delivery pump 5；Sub-control mechanism includes submaster controller 2 and the sidestream amount variator being installed on looped pipeline road；Sidestream amount variator is connected with submaster controller 2 signal, and submaster controller 2 connects regulation valve 6.
Described master controller 1 and submaster controller 2 all use PLC；Main flow variator and sidestream amount variator all use Siemens's mass flowmenter.
Using method of the present utility model:
Caprolactam flow i.e. main flow carries out constant flow by master controller 1, variable-frequency governor 4 with motor delivery pump 5 and controls to enter polymerization tower；
Additive and titanium dioxide flow, the most driven flow is that caprolactam main flow draws actual flow through ratio coefficient computing, the caprolactam flow i.e. flow value of main flow is transferred to master controller 1 by main flow variator, data on flows is transmitted to comparator 3 by master controller 1, it is calculated additive and titanium dioxide flow through comparator 3, the flow value of the most driven flow, and this value is transmitted to submaster controller 2；Submaster controller 2 controls to adjust valve 6 and regulates additive and the flow of titanium dioxide flow in looped pipeline road；The sidestream amount variator being simultaneously installed on looped pipeline road, feeds back to submaster controller 2 by the real-time traffic signal on looped pipeline road, and forward path and the feedback network of the most driven flow signal constitute closed-loop path.
Claims (2)
1. the flow double-close-loop ratio control system that a kind is applied in PA6 production process, it is characterised in that: include that a main control mechanism and organize are provided with comparator (3) between the sub-control mechanism that sub-control mechanism in parallel, main control mechanism and many groups are in parallel more；Main control mechanism includes master controller (1) and the main flow variator being installed on main line, main flow variator is connected with master controller (1) signal, master controller (1) is connected with variable-frequency governor (4), and variable-frequency governor (4) is connected with motor delivery pump (5)；Sub-control mechanism includes submaster controller (2) and the sidestream amount variator being installed on looped pipeline road；Sidestream amount variator is connected with submaster controller (2) signal, and submaster controller (2) connects regulation valve (6).
A kind of flow double-close-loop ratio control system being applied in PA6 production process the most according to claim 1, it is characterised in that: described master controller (1) and submaster controller (2) all use PLC；Main flow variator and sidestream amount variator all use Siemens's mass flowmenter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620191499.3U CN205485658U (en) | 2016-03-14 | 2016-03-14 | Two closed loop ratio control of flow system for in PA6 production process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620191499.3U CN205485658U (en) | 2016-03-14 | 2016-03-14 | Two closed loop ratio control of flow system for in PA6 production process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205485658U true CN205485658U (en) | 2016-08-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620191499.3U Active CN205485658U (en) | 2016-03-14 | 2016-03-14 | Two closed loop ratio control of flow system for in PA6 production process |
Country Status (1)
| Country | Link |
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| CN (1) | CN205485658U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110273825A (en) * | 2019-06-24 | 2019-09-24 | 陕西飞机工业（集团）有限公司 | Double pump double oil circuits parallel connection supercharging control method |
-
2016
- 2016-03-14 CN CN201620191499.3U patent/CN205485658U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110273825A (en) * | 2019-06-24 | 2019-09-24 | 陕西飞机工业（集团）有限公司 | Double pump double oil circuits parallel connection supercharging control method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |