CN102854860B - Scraper control method and device for polycondensation reaction kettle - Google Patents
Scraper control method and device for polycondensation reaction kettle Download PDFInfo
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- CN102854860B CN102854860B CN201210324152.8A CN201210324152A CN102854860B CN 102854860 B CN102854860 B CN 102854860B CN 201210324152 A CN201210324152 A CN 201210324152A CN 102854860 B CN102854860 B CN 102854860B
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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
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The invention proposes a scraper control method for a polycondensation reaction kettle. The method comprises the following steps: 1, adding an alarm signal to a DCS (distributed control system) control logic according to the time required by a scrapper to finish an action once, sending the alarm signal to remind a control operator to detect and process if the scrapper does not return to a top position after the time for which the scrapper departs from the upper position exceeds the time required by the scrapper to finish the action once; 2, immediately switching into automatic control and lifting the scrapper upwards after the alarm signal is triggered no matter which operation mode or position a scrapper action operation module in a DCS control system is in, and thoroughly preventing the scrapper from staying at the bottom part from a control principle. In addition, the invention also proposes a scraper control device for the polycondensation reaction kettle. The improved scrapper device stably runs, and the stable operation of a scrapper system and process control of the polycondensation reaction kettle is powerfully guaranteed.
Description
Technical field
The present invention relates to a kind of control method and device of scraper, and be particularly related to a kind of control method and device of scraper of batch condensation polymerization reactor.
Background technology
Scraper is the removing device of the oligomer piled up on batch condensation polymerization reactor vacuum pipe tube wall, anti-oligomer stops up vacuum pipe and uses, to keeping batch condensation polymerization reactor vacuum to stablize, have key effect, it is regulated the parts such as parts and pipeline, scraper promotion cylinder and position detecting switch, control system to form by source of the gas.Actual production is in service repeatedly occurs that scraper rests on bottom and stops up vacuum pipe, and vacuum in batch condensation polymerization reactor is declined, and a few minutes will cause melt viscosity to decline, and surpassing 10 minutes product qualities will degradation, has a strong impact on normal production run.
Routinely, the steering logic figure of the scraper of batch condensation polymerization reactor as shown in Figure 1, in scraper action (manual/auto), leave after upper position, must be scraper to be detected to arrive after lower position (XV-1233.PV.0), scraper control module (XV-1233.MODE) could transfer to automatically and upwards lifting (XV-1233.CSV.0) automatically.When occurring that bottom position abnormal signal can not detect situation, scraper is the state in scraping downwards and can not conversion and control state always, and relevant alerting signal is sent; Simultaneously when the gas leakage of scraper source of the gas causes resting on bottom position, although there is the conversion of control module state, because of without source of the gas, scraper still rests on bottom and relevant alerting signal is sent.
The reason that causes scraper to rest on bottom from actual motion has several respects: the one, and source of the gas parts decompression valve and gas source pipe road are comprised of plastic material, and the easily aging gas leakage of breaking in use makes cylinder lose source of the gas power and bottom can not promoting and resting on; The 2nd, cylinder bottom position detection signal occurs abnormal, and control system thinks that scraper does not scrape bottom by mistake, and the state of scraping under always keeping can not be transformed in time upwards and promote and control, and makes scraper rest on bottom.
Summary of the invention
For above-mentioned, cause the reason that batch condensation polymerization reactor doctor position is abnormal, the present invention proposes a kind of batch condensation polymerization reactor scraper control method, comprising:
Step 1: complete the time that one-off needs according to batch condensation polymerization reactor scraper, in DCS steering logic, increase alerting signal, when the time that scraper leaves upper position surpasses scraper and completes after the time that one-off needs, the position that do not back on top yet is sent alerting signal and is controlled operating personnel's check processing in reminding.
Step 2: after above-mentioned alerting signal triggers, no matter the scraper motion action module in DCS control system is in which kind of mode of operation and position, transfer immediately automatic control to and upwards promote scraper, from control principle, thoroughly preventing that scraper from resting on the situation generation of bottom.
Further, also comprise manual bypass source of the gas.
Further, in described manual bypass source of the gas, hand valve is installed.
Further, the gas circuit element of described scraper is hardware.
In addition, the present invention also provides a kind of batch condensation polymerization reactor scraper control device, comprises signal alarm module, scraper motion action module, DCS steering logic module and automatic control module, wherein:
Scraper motion action module, carries out scraper by DCS steering logic module and moves;
DCS steering logic module has signal alarm module, for leaving the time of upper position at scraper when surpassing scraper and completing the time that one-off needs but do not back on top yet position, sends alerting signal, controls operating personnel's check processing in prompting;
After above-mentioned alerting signal triggers, though scraper motion action module in which kind of mode of operation and position, described automatic control module is controlled scraper motion action module and is upwards promoted scraper, thoroughly prevents that the situation that scraper rests on bottom from occurring from control principle.
Further, also comprise manual bypass source of the gas.
Further, described manual bypass source of the gas has hand valve.
Further, the gas circuit element of described scraper is hardware.
After such scheme is implemented, doctor blade device is stable, do not occur occurring because of the bottom situation that rests on that the reasons such as control system or the damage of gas source pipe circuit unit cause, sound assurance batch condensation polymerization reactor doctor blade system and the stable operation of batch condensation polymerization reactor technology controlling and process.
Accompanying drawing explanation
Fig. 1 is conventional batch condensation polymerization reactor scraper steering logic figure;
Fig. 2 is according to batch condensation polymerization reactor scraper steering logic figure of the present invention; And
Fig. 3 is according to batch condensation polymerization reactor scraper gas circuit schematic diagram of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that embodiment described herein is only for explaining the present invention, rather than for limiting the present invention.
As shown in Figure 2, in the scraper operation proposing in the present invention, at scraper, leave upper position (XV-1233.PV.2) and surpass regular event after the time (time relay 3) once, send scraper and at upper position, do not report to the police (XAL-1233.PV.L), in prompting, control operating personnel and process in time; At scraper, leaving the upper position time surpasses scraper and scrapes bottom under normal and need after the time of use, by the time relay 4, make scraper action control module be automatically converted to automatic mode (XV-1233.MODA.AUT) and upwards promote scraper (XV-1233.CSV.2), from control principle, thoroughly prevent that scraper from resting on the situation generation of bottom position.
Further, in air-channel system, increased manual bypass, all by hand valve, operated, and the source of the gas of manual bypass takes from an other road source of the gas, guarantee to greatest extent device systems safe and reliable operation.
When conventional source of the gas can not be delivered to scraper cylinder for some reason, can operate by hand valve, manual bypass source of the gas is introduced to cylinder, cylinder is upwards promoted, avoid scraper to rest on bottom position.
In a preferred embodiment of the invention, gas path component is all the parts of reliable metal material, for preventing that the extreme abnormal conditions such as the control assemblies such as solenoid valve damage and source of the gas is stopped the supple of gas or steam suddenly from occurring causing scraper to rest on bottom.
Above are only preferred embodiment of the present invention, certainly, can also have other embodiment with further exploration according to actual needs.But, should be clear and definite, the conversion based on the similar embodiment with same idea above-mentioned or that other is not explained out, within all should being encompassed in the protection domain of the claims in the present invention.
Claims (6)
1. a scraper control method for batch condensation polymerization reactor, is characterized in that, comprising:
Step 1: complete the time that one-off needs according to scraper, in DCS steering logic, increase alerting signal, when the time that scraper leaves upper position surpasses scraper and completes after the time that one-off needs, the position that do not back on top yet is sent alerting signal and is controlled operating personnel's check processing in reminding;
Step 2: after above-mentioned alerting signal triggers, no matter the scraper motion action module in DCS control system is in which kind of mode of operation and position, transfer immediately automatic control to and upwards promote scraper, from control principle, thoroughly preventing that scraper from resting on the situation generation of bottom;
When conventional source of the gas can not be delivered to scraper cylinder for some reason, by the hand valve of installing in manual bypass source of the gas, operate, manual bypass source of the gas is introduced to cylinder, cylinder is upwards promoted.
2. according to method shown in claim 1, it is characterized in that, the gas circuit element of described scraper is hardware.
3. a scraper control device for batch condensation polymerization reactor, is characterized in that, comprises signal alarm module, scraper motion action module, DCS steering logic module and automatic control module and manual bypass, wherein:
Scraper motion action module, carries out scraper by DCS steering logic module and moves;
DCS steering logic module has signal alarm module, for leaving the time of upper position at scraper when surpassing scraper and completing the time that one-off needs but do not back on top yet position, sends alerting signal, controls operating personnel's check processing in prompting;
After above-mentioned alerting signal triggers, though scraper motion action module in which kind of mode of operation and position, described automatic control module is controlled scraper motion action module and is upwards promoted scraper, thoroughly prevents that the situation that scraper rests on bottom from occurring from control principle;
When conventional source of the gas can not be delivered to scraper cylinder for some reason, by manual bypass, cylinder is upwards promoted.
4. according to claim 3 shown device, it is characterized in that, also comprise manual bypass source of the gas.
5. according to claim 4 shown device, it is characterized in that, described manual bypass source of the gas has hand valve.
6. according to claim 3 shown device, it is characterized in that, the gas circuit element of described scraper is hardware.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210324152.8A CN102854860B (en) | 2012-09-05 | 2012-09-05 | Scraper control method and device for polycondensation reaction kettle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210324152.8A CN102854860B (en) | 2012-09-05 | 2012-09-05 | Scraper control method and device for polycondensation reaction kettle |
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| Publication Number | Publication Date |
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| CN102854860A CN102854860A (en) | 2013-01-02 |
| CN102854860B true CN102854860B (en) | 2014-11-26 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2839283Y (en) * | 2005-09-08 | 2006-11-22 | 锦西化工机械(集团)有限责任公司 | Large polyfurnace for chloroethene mass polymerization |
| JP2011021130A (en) * | 2009-07-17 | 2011-02-03 | Nippon Shokubai Co Ltd | (meth)acrylic acid-based polymer and method for producing the same |
| CN102029138B (en) * | 2010-10-29 | 2012-10-31 | 张家港市德宝化工有限公司 | Polymerizing kettle |
| CN102295087A (en) * | 2011-05-12 | 2011-12-28 | 苏州中化药品工业有限公司 | Monitoring device |
| CN202886947U (en) * | 2012-09-05 | 2013-04-17 | 江苏申久化纤有限公司 | Scraper control device for polycondensation reaction kettle |
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Address after: 215428 Shalu Highway 99, Jungjing Town, Taicang City, Suzhou City, Jiangsu Province Patentee after: Jiangsu Shenjiu (Group) Co.,Ltd. Address before: 215428 Shalu Highway 99, Jungjing Town, Taicang City, Suzhou City, Jiangsu Province Patentee before: JIANGSU SHENJIU CHEMICAL FIBER Co.,Ltd. |
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