CN100582790C - Caking and flaking detection method and detection device in polypropylene production - Google Patents
Caking and flaking detection method and detection device in polypropylene production Download PDFInfo
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- CN100582790C CN100582790C CN200810019807A CN200810019807A CN100582790C CN 100582790 C CN100582790 C CN 100582790C CN 200810019807 A CN200810019807 A CN 200810019807A CN 200810019807 A CN200810019807 A CN 200810019807A CN 100582790 C CN100582790 C CN 100582790C
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Abstract
A method for detecting agglomeration and flaking in process of polypropylene is provided. Propylene is reacted in reactor to form polypropylene by polymerization, and the powder out of reactor is sent to gas expansion bag filter and fell to degassing chamber by rotating valve on the bottom of the bag filter, the electric signal on the outlet of collecting gas expansion bag filter detect agglomeration and flaking by electric signal on the outlet of rotating valve of receiving and analyzing gas expansion bag filter. The present invention is also used for detecting agglomeration and flaking of polyethylene and polypropylene polyethylene multiple copolymerization process. The present invention can detect agglomeration and flaking exactly and rapidly without changing the techniques and equipment in existence, has merits of simple structure of detecting and convenient operation, is a green, safety and environment-friendly detecting method.
Description
Technical field
The present invention relates to the detection of caking knot sheet in the polypropylene production technology, be specially the detection method and the pick-up unit of caking knot sheet in a kind of polypropylene production.
Background technology
BP Amoco gas phase polymarization method for prodcing polyacrylates adopts horizontal type agitated bed reactor, its system design comprises two horizontal reactors, these two reactor series operations all the time, under some condition of production, can generate fibrous or bulk polymer in the polymer reactor, these fibrous or bulk polymers can influence reactor powder transfer system to back processing workshop section, and when situation was serious, fibrous or bulk polymer can force device to stop.Up to the present, the reason that the fibrous and block material of having confirmed generates has that material level control is improper, quench liquid sprays inequality and catalyst distribution is unequal, detects research for BPAmoco gas phase polymarization method for prodcing polyacrylates caking at present and does not still have the pertinent literature report.
Relative more for caking in the industrial fluidized bed reactor with the research of knot sheet, for example pressure decline method, optical fiber detection method, radiation ray method, acoustic emission detection method etc.Wherein, the reacting condition of pressure decline method pressure drop lags behind than actual caking, and when the process of luming be a plurality of brief summary pieces when growing simultaneously, pressure drop can not this growth course of accurate response; Optical fiber detection method device complexity costs an arm and a leg, technical requirement height during use; The radiation ray method has injury to human body; In addition, emerging in recent years acoustic emission testing technology, having does not influence interior flow field and distributes, detection signal comprised contains much information, easy to detect, expense is cheap, device is simple, and the microcomputer of contacting easily carries out synchronous detection to be handled, but the establishment of its characteristic parameter is difficult, sensitivity is low, is not easy to get rid of irrelevant information.These methods respectively have relative merits, can not be moved to simply in the caking detection of BPAmoco gas phase polymarization method for prodcing polyacrylates, therefore, a kind of simple, caking knot chip detection method of being applicable to BP Amoco gas phase polymarization method for prodcing polyacrylates of development has great importance to the long-period stable operation of assurance device.
Summary of the invention
The technical problem to be solved in the present invention is: detect in the existing polypropylene production method of caking knot sheet can not equilibrium to satisfy precision expensive low, be simple and easy to production requirements such as usefulness, especially do not have a kind of caking knot chip detection method of the BP of being applicable to Amoco gas phase polymarization method for prodcing polyacrylates.
Technical scheme of the present invention is: the detection method of caking knot sheet during polypropylene is produced, propylene polymerization reaction take place in reactor generates polypropylene, deliver to the gas expanding bag filter from the powder that reactor comes out, powder falls among the degassing storehouse by the rotary valve below the bag hose, gather the current signal of gas expanding bag filter exit rotary valve, select the amplitude A of current signal, the mean value A of interior current signal amplitude of a period of time
Mean, maximal value A
Max, minimum value A
MinOr in the meansquaredeviation any one be as characteristic parameter C, and the characteristic parameter of current signal is set at threshold value of warning C in the time of will not luming sheet
0, the current signal characteristic parameter C that gathers in producing is greater than threshold value of warning C
0The time, can think has caking knot sheet to produce C=C
0Then think and be in normal condition.
For conveniently recognized, caking knot sheet state coefficient D=(C-C is set
0)/C
0If D＞0 has illustrated that caking knot sheet exists, D=0 illustrates that then caking knot sheet does not exist; D is big more for caking knot sheet state coefficient, illustrates that caking knot sheet is big more or caking knot sheet is many more.
In the BP Amoco gas phase polymarization method for prodcing polyacrylates, propylene under the effect of catalyzer in two horizontal reactors polymerization reaction take place generate polypropylene, deliver to the gas expanding bag filter from the pressured difference of powder that first reactor (single reactor operation) or second reactor (double-reactor serial operation) come out, gas expanding bag filter on-stream pressure is 0.02MPa, low pressure helps to remove volatile component, but bag hose can not be removed the hydro carbons in the powder fully.Powder falls among the degassing storehouse by the rotary valve below the bag hose, caking in the powder can cause the increase of rotary valve energy consumption, show as the increase of rotary valve electric current under the certain situation of voltage, the caking in the powder is many more or big more, and the electric current of rotary valve is also just big more.Therefore, can carry out collection analysis to current signal, extract characteristic parameter, to not lump characteristic parameter when existing as standard value, be set at threshold value of warning, when the characteristic parameter that extracts during greater than threshold value of warning, can think has caking knot sheet to produce, and the characteristic parameter of extraction equals threshold value of warning and then thinks and be in normal condition.
The current signal frequency acquisition of gas expanding bag filter of the present invention exit rotary valve is 1Hz～1MHz.
The pick-up unit of detection method of the present invention: comprise advance signal amplifying circuit, transmission cable, capture card and computing machine, the current signal of motor input advance signal amplifying circuit on the rotary valve, advance signal amplifying circuit output is sent to by transmission cable and is converted to digital signal on the capture card and stores in computing machine or subsequent treatment, and described advance signal amplifying circuit comprises at least one signal amplifier.As required, pick-up unit also can be provided with change-over circuit, motor current signal input change-over circuit on the rotary valve converts voltage signal to, described voltage signal input advance signal amplifying circuit, be sent to by transmission cable again and be converted to digital signal on the capture card and in computing machine, store or handle, according to the needs of reality use to resistance, change-over circuit can be composed in parallel by one or more resistance string.
The caking knot sheet that the present invention also can be applicable to tygon, polypropylene-polyethylene multi-component copolymer technology detects.
The present invention detects caking knot sheet by the current signal of reception and analytical gas expanding bag filter exit rotary valve, need not to change existing processes and equipment, can accurately detect caking knot sheet efficiently, pick-up unit is simple in structure, easy to use, be the detection method of a kind of green, safety, environmental protection.
Description of drawings
Fig. 1 is the present invention by the current signal pick-up unit theory diagram that sheet detects that lumps.
Fig. 2 is the present invention by the voltage signal pick-up unit theory diagram that sheet detects that lumps.
Fig. 3 is the circuit theory diagrams of corresponding diagram 1 pick-up unit.
Fig. 4 is the circuit theory diagrams of corresponding diagram 2 pick-up units.
Fig. 5 is the amplitude of the embodiment of the invention 1 rotary valve current signal adds number with caking a change curve.
Fig. 6 is the change curve of the amplitude of the embodiment of the invention 1 rotary valve current signal with the caking size.
Embodiment
The inventive method is gathered the current signal of gas expanding bag filter exit rotary valve in polyacrylic production run, extract characteristic parameter C, and the characteristic parameter when existing of will not luming is set at threshold value of warning C as standard value
0, the characteristic parameter C that extracts in production run is greater than threshold value of warning C
0The time, can think has caking knot sheet to produce, and is in normal condition if both equate then to think.For conveniently recognized, caking knot sheet state coefficient D=(C-C is set
0)/C
0If D＞0 has illustrated that caking knot sheet exists, D=0 illustrates that then caking knot sheet does not exist; D is big more for caking knot sheet state coefficient, illustrates that caking knot sheet is big more or caking knot sheet is many more.
Pick-up unit of the present invention comprises advance signal amplifying circuit, transmission cable, capture card and computing machine, as Fig. 1, after the current signal of motor amplifies by preposition current signal amplifier on the rotary valve, be sent to by transmission cable and be converted to digital signal on the data collecting card, import again and store or subsequent treatment circuit theory diagrams such as Fig. 3 in the computing machine.Pick-up unit also can detect caking knot sheet by voltage signal, as Fig. 2, the current signal of rotary valve motor converts voltage signal (U=I*R) to by conversion/sample circuit (resistance value R) earlier, amplify by the forward voltage signal amplification circuit again, by transmission cable be sent to be converted on the data collecting card after the digital signal again through calculating be converted to current signal (I '=U/R), in computing machine, store or subsequent treatment circuit theory diagrams such as Fig. 4.Conversion/sample circuit is composed in parallel by one or more resistance string, the signal amplifier of advance signal amplifying circuit can be one or more, input signal is that current signal uses current signal amplifier, and input signal is a voltage signal working voltage signal amplifier.
In lab setup, the rotary discharge valve identical with producing 200 tons of polypropylene plants per year, identical material and identical discharging speed are set, by in material, adding the caking of different sizes or the caking of the same race of different numbers, the current signal of collection and analytical gas expanding bag filter exit rotary valve is investigated the situation of change of current signal with the caking size and the number that lumps.Wherein, sample frequency 500Hz, sampling time 2s.With the amplitude A of the current signal that collects as characteristic parameter, the amplitude A of current signal under the known normal condition
0=0.400 ampere.In material, add diameter successively and be 1～5 of the spherical caking of class of 30mm, the amplitude of rotary valve current signal such as table 1 and shown in Figure 5.As can be seen from Figure 5, the amplitude of rotary valve current signal is with approximate linear the increasing progressively of the increase of caking number.
The amplitude of rotary valve current signal under the different caking of table 1 addition
Adding diameter respectively in material is the spherical caking of 6 kinds of 20mm, 25mm, 30mm, 35mm, 40mm and 45mm, at this moment, and the amplitude of rotary valve current signal such as table 2 and shown in Figure 6.Can find that from figure the rotary valve current signal increases progressively with the approximate cube relation that is of the increase of agglomerate diameter, speedup increases gradually.This is because the weight of caking is the cube relation with the increase of agglomerate diameter and increases progressively.It is heavy more to lump, and the required energy consumption of rotary valve is just big more, and the current signal of its output accordingly is just big more.
The amplitude of rotary valve current signal when table 2 adds the caking of different sizes
Produce per year in 200,000 tons of polypropylene industrial process units in certain company, the current signal of collection and analytical gas expanding bag filter exit rotary valve, sample frequency 10000Hz, sampling time 10s, the current signal of gathering is converted to digital signal input Computer Processing, with the amplitude A of the current signal that collects as characteristic parameter, the amplitude A of current signal under the known normal condition
0=13.00 amperes, then caking is tied the coefficient of regime D=(A-A of sheet
0)/A
0, when D greater than 0 the time, promptly can judge has caking knot sheet in the reactor, D=0 then illustrates caking knot sheet in the reactor; D is big more, illustrates that the caking in the reactor is big more or many more.
Produce per year in 200,000 tons of polypropylene industrial process units in certain company, the current signal of collection and analytical gas expanding bag filter exit rotary valve, through the voltage signal that obtains after the change-over circuit conversion, sample frequency 1Hz, sampling time 100s, wherein change-over circuit is composed in series by two resistance, and resistance is 500 ohm.The voltage signal that collects is converted to digital signal, and the resistance divided by change-over circuit promptly is converted into the digital current signal again, just the mean value A of current signal amplitude in the 100s
Mean, with A
MeanAs characteristic parameter input computing machine, the mean value A of current signal amplitude in the 100s under the known normal condition
Mean0=12.98 amperes, then caking is tied the coefficient of regime D=(A of sheet
Mean-A
Mean0)/A
Mean0, when D greater than 0 the time, promptly can judge has caking knot sheet in the reactor, D=0 illustrates that then reactor has caking knot sheet in not having; D is big more, illustrates that the caking in the reactor is big more or many more.
Produce per year in 20,000 tons of polypropylene trial production devices in certain company, gather and the current signal of analytical gas expanding bag filter exit rotary valve, sample frequency 1MHz, sampling time 0.1s is with the maximal value A of the current signal amplitude that collects in the 0.1s
MaxAs characteristic parameter, under the known normal condition, the maximal value A of the current signal amplitude that collects in the 0.1s
Max0=1.32 amperes, then caking is tied the coefficient of regime D=(A of sheet
Max-A
Max0)/A
Max0, when D greater than 0 the time, promptly can judge has caking knot sheet in the reactor, D=0 then illustrates in the reactor caking knot sheet; D is big more, illustrates that the caking in the reactor is big more or many more.
Produce per year in 20,000 tons of polypropylene pilot scale process units in certain company, gather and the current signal of analytical gas expanding bag filter exit rotary valve, sample frequency 100Hz, sampling time 5s is with the minimum value A of the current signal amplitude that collects in the 5s
MinAs characteristic parameter, under the known normal condition, the minimum value A of the current signal amplitude that collects in the 0.1s
Min0=1.29 amperes, then caking is tied the coefficient of regime D=(A of sheet
Min-A
Min0)/A
Min0, when D greater than 0 the time, promptly can judge has caking knot sheet in the reactor, D=0 then illustrates in the reactor caking knot sheet; D is big more, illustrates that the caking in the reactor is big more or many more.
Embodiment 6
Produce per year in 200 tons of polypropylene pilot scale process units in certain research institute, the current signal of collection and analytical gas expanding bag filter exit rotary valve, sample frequency 500Hz, sampling time 2s, the current signal of gathering is converted to digital signal input Computer Processing, with the meansquaredeviation of the current signal amplitude that collects in the 2s as characteristic parameter, under the known normal condition, the meansquaredeviation of the current signal amplitude that collects in the 2s
0=0.01, then caking is tied the coefficient of regime D=(σ-σ of sheet
0)/σ
0, when D greater than 0 the time, promptly can judge has caking knot sheet in the reactor, D=0 then illustrates caking knot sheet in the reactor; D is big more, illustrates that the caking in the reactor is big more or many more.
Because in the polypropylene, polypropylene-polyethylene multi-component copolymer production process, the situation of caking knot sheet and PP type seemingly, the present invention's chip detection method that lumps also can be applicable in tygon, the polypropylene-polyethylene multi-component copolymer technology.
Claims (8)
1, the detection method of caking knot sheet during polypropylene is produced, propylene polymerization reaction take place in reactor generates polypropylene, deliver to the gas expanding bag filter from the powder that reactor comes out, powder falls among the degassing storehouse by the rotary valve below the bag hose, it is characterized in that gathering the current signal of gas expanding bag filter exit rotary valve, select the amplitude A of current signal, the mean value A of interior current signal amplitude of a period of time
Mean, maximal value A
Max, minimum value A
MinOr in the meansquaredeviation any one be as characteristic parameter C, and the characteristic parameter of current signal is set at threshold value of warning C in the time of will not luming sheet
0, the current signal characteristic parameter C that gathers in producing is greater than threshold value of warning C
0The time, can think has caking knot sheet to produce C=C
0Then think and be in normal condition.
2, the detection method of caking knot sheet during polypropylene according to claim 1 is produced is characterized in that being provided with caking knot sheet state coefficient D=(C-C
0)/C
0If D＞0 has illustrated that caking knot sheet exists, D=0 illustrates that then caking knot sheet does not exist; D is big more for caking knot sheet state coefficient, illustrates that caking knot sheet is big more or caking knot sheet is many more.
3, the detection method of caking knot sheet is characterized in that the current signal frequency acquisition of gas expanding bag filter exit rotary valve is 1Hz～1MHz during polypropylene according to claim 1 and 2 was produced.
4, a kind of pick-up unit of realizing caking knot chip detection method in the polypropylene production as claimed in claim 1 or 2, it is characterized in that comprising advance signal amplifying circuit, transmission cable, capture card and computing machine, the current signal of motor input advance signal amplifying circuit on the rotary valve, through the output of advance signal amplifying circuit, be sent to by transmission cable again and be converted to digital signal on the capture card, store in computing machine or subsequent treatment, described advance signal amplifying circuit comprises at least one signal amplifier.
5, a kind of pick-up unit of realizing caking knot chip detection method in the polypropylene production as claimed in claim 3, it is characterized in that comprising advance signal amplifying circuit, transmission cable, capture card and computing machine, the current signal of motor input advance signal amplifying circuit on the rotary valve, through the output of advance signal amplifying circuit, be sent to by transmission cable again and be converted to digital signal on the capture card, store in computing machine or subsequent treatment, described advance signal amplifying circuit comprises at least one signal amplifier.
6, a kind of pick-up unit as claimed in claim 4, it is characterized in that also comprising change-over circuit, motor current signal input change-over circuit on the rotary valve converts voltage signal to, described voltage signal input advance signal amplifying circuit is sent to by transmission cable and is converted to digital signal on the capture card and stores in computing machine or handle.
7, a kind of pick-up unit as claimed in claim 5, it is characterized in that also comprising change-over circuit, motor current signal input change-over circuit on the rotary valve converts voltage signal to, described voltage signal input advance signal amplifying circuit is sent to by transmission cable and is converted to digital signal on the capture card and stores in computing machine or handle.
8, the detection method of caking knot sheet during polypropylene according to claim 1 and 2 is produced is characterized in that the caking knot sheet that also can be applicable to tygon, polypropylene-polyethylene multi-component copolymer technology detects.
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| CN200810019807A CN100582790C (en) | 2008-03-17 | 2008-03-17 | Caking and flaking detection method and detection device in polypropylene production |
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| CN200810019807A CN100582790C (en) | 2008-03-17 | 2008-03-17 | Caking and flaking detection method and detection device in polypropylene production |
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| CN100582790C true CN100582790C (en) | 2010-01-20 |
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| CN103575333B (en) * | 2013-11-06 | 2015-10-07 | 中沙（天津）石化有限公司 | The detection method of particle from caking in multizone circulating reactor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3554760A (en) * | 1967-12-26 | 1971-01-12 | Gen Foods Corp | Method of agglomerating food powder |
| US4931212A (en) * | 1984-03-19 | 1990-06-05 | Aluminium Pechiney | Process for continuous regulation of the power with which pastes intended for the fabrication of carbonaceous agglomerates are mixed |
-
2008
- 2008-03-17 CN CN200810019807A patent/CN100582790C/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3554760A (en) * | 1967-12-26 | 1971-01-12 | Gen Foods Corp | Method of agglomerating food powder |
| US4931212A (en) * | 1984-03-19 | 1990-06-05 | Aluminium Pechiney | Process for continuous regulation of the power with which pastes intended for the fabrication of carbonaceous agglomerates are mixed |
Non-Patent Citations (8)
| Title |
|---|
| UNIPOL工艺结块与结片的防止措施. 刘宏吉等.弹性体，第13卷第5期. 2003 |
| UNIPOL工艺结块与结片的防止措施. 刘宏吉等.弹性体，第13卷第5期. 2003 * |
| 干燥机出料旋转阀电流突升的原因及对策. 韩靖.聚酯工业，第19卷第5期. 2006 |
| 干燥机出料旋转阀电流突升的原因及对策. 韩靖.聚酯工业，第19卷第5期. 2006 * |
| 气相法聚丙烯脱气仓的配管设计. 陈军.石油化工设计，第22卷第1期. 2005 |
| 气相法聚丙烯脱气仓的配管设计. 陈军.石油化工设计，第22卷第1期. 2005 * |
| 气相聚合流化床内静电与结片现象的研究进展. 于恒修等.石油化工，第36卷第2期. 2007 |
| 气相聚合流化床内静电与结片现象的研究进展. 于恒修等.石油化工，第36卷第2期. 2007 * |
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