CN104571154A - Automatic detection and control method and device for liquid level in pre-polycondensation reaction kettle with stirring function - Google Patents
Automatic detection and control method and device for liquid level in pre-polycondensation reaction kettle with stirring function Download PDFInfo
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Abstract
The invention discloses an automatic detection and control method and device for the liquid level in a pre-polycondensation reaction kettle with a stirring function. According to the technical scheme, a laser distance meter is arranged above the reaction kettle, a detection block is fixedly arranged on the shaft wall, exposed out of the reaction kettle, of a stirring shaft, and a detection switch is arranged on a fixed position outside the reaction kettle. When the detection switch detects a detection block signal, a stirring paddle on the stirring shaft is at the position which does not shield the laser emitted by the laser distance meter; in the state, the actual liquid level of the reaction kettle is calculated according to a distance signal measured by the laser distance meter; the actual liquid level is compared with a preset liquid level value through a PID module in a PLC controller, and the compared data is used for controlling the frequency of a discharge pump frequency converter, so that the rotation speed of a discharge pump motor is adjusted. The scheme solves the problem that the shielding of the stirring paddle in the reaction kettle interferes with laser measurement, and the measured liquid level precision of materials can be +/-3mm. The device has the advantages of being simple in structure and reliable in running and is suitable for liquid level detection and control of a variety of polymer pre-polycondensation reaction kettles.
Description
Technical field
The present invention relates to and liquid level in reactor to be detected automatically and then according to detected automatic control of liquid discharging speed, the method stablizing liquid level, and implement the automatic detection and control device of liquid level of said method, be applicable to the prepolymerization reaction still with stirring on polymer production line, belong to polymer production and control technology field.
Background technology
In most production processes of polyalcohol, need to pass through by esterification to the prepolymerization reaction in whole polycondensation process, its esterification products esterification obtained finally completes esterification and under certain vacuum condition, carries out polycondensation reaction and generates performed polymer, thus ensures whole polycondensation reaction energy output specification product.Therefore the prepolymerization reaction in the middle of polymeric device production line is one of critical process flow process, technological requirement is in course of reaction, material liquid level in prepolymerization reaction still is detected, the speed controlling discharging pump according to detected material liquid level carries out discharging, make the material liquid level in prepolymerization reaction still remain stable, meet the requirement of continuous prodution.
Existing level measuring technology is existing multiple report both at home and abroad, as laser measurement.Chinese patent 201120390433.4, large-tonnage tilting furnacne laser liquid level control device, utilizes laser range finder to measure the liquid level of aluminium liquid, belongs to unobstructed detection; Modern electronic technology 2009.08, " the phase place laser measurement system of boiler liquid level ", adopts optical fiber as transmission signal vector, utilizes phase laser distance principle to detect boiler liquid level, also belong to unobstructed detection; Chinese patent 201120390433.4, a kind of laser liquid-level measurement device, this patent is only applicable to the level gauging of generic container.Above-mentioned laser measuring technique also widely uses in prepolymerization reaction still, but in actual use, with controlling, following deficiency is still existed to the level gauging of material in prepolymerization reaction still: blocking 1. due to paddle in reactor, adopt laser measurement can be stirred oar interference, the accuracy that impact is measured; 2. the same existence due to paddle, is difficult to effective direct-detection liquid level above reactor, determines that material liquid level and manual adjustments discharging pump machine rotating speed control discharging by artificially observing, easily cause accuracy not enough, waste time and energy, the shortcoming such as inefficiency; 3. the material in prepolymerization reaction still is generally the easy adhesion state of thickness, if do not adopt laser measurement and adopt flange liquid level transmission device to detect material liquid level, its film head is sticky long-pending material easily, and then impact detects the reliability of data.
Summary of the invention
In order to solve the problems of the technologies described above, an object of the present invention is to provide a kind of to being with liquid level in stirring prepolymerization reaction still still to carry out the method for Detection & Controling, accurately to detect liquid level in still, and according to surveyed automatic control of liquid discharging speed, keep reactant doses in still relatively stable, realize prepolymerization reaction still and automatically control; Two of the object of the invention is to provide a kind of device implementing the automatic Detection & Controling of liquid level of said method, improves the automatic control level that band stirs prepolymerization reaction still.
Technical solution of the present invention is, a kind of method with stirring the automatic Detection & Controling of prepolymerization reaction still liquid level, comprises the steps:
(1) laser range finder is set above reactor, the shaft exposing reactor outside is fixedly installed a detection block, this detection block rotates along with the rotation of shaft, separately one detector switch is set in the outside fixed position of reactor, when making it monitor described detection block signal, the paddle on shaft is in the position of not blocking laser range finder institute Emission Lasers;
(2) the distance value signal that laser range finder is tested is sent to PLC system in real time, when described detector switch detects detection block signal, obtains actual liquid level height in reactor according to the test value that now laser range finder records;
(3) by the actual liquid level height that detects and default level value, compared by the PID module in PLC, data are relatively for controlling discharging pump frequency converter frequency and then controlling discharging pump rotating speed, when actual liquid level height is greater than default level value, improve discharging pump rotating speed, otherwise then reduce discharging pump rotating speed, thus reactor liquid level is controlled.
Further, band of the present invention stirs in the middle of the method for the automatic Detection & Controling of liquid level in prepolymerization reaction still, survey the height of actual liquid level in prepolymerization reaction still, equal the vertical range of laser range finder to Polycondensation Reactor and Esterification Reactor and the difference of laser range finder test value.
The present invention also provides liquid level automatic Detection & Controling device, for to the automatic Detection & Controling with liquid level in the prepolymerization reaction still still of stirrer, device comprises testing agency and control gear: described testing agency comprises the horizontal shaft be arranged in reactor, the paddle be arranged on described shaft, the laser range finder arranged in reactor opening part top position, be fixedly installed on the detection block exposed on the shaft outer wall of reactor outside, and detector switch that is corresponding with described detection block, that be fixedly installed on the outside fixed position of reactor; Described control gear comprises the PLC that reception laser range finder transmits with detector switch, the discharging pump frequency converter be connected with described PLC output terminal, and discharging motor.
Preferably, in the middle of the automatic Detection & Controling device of above-mentioned liquid level, described paddle is the claw stirrer paddle combination comprising at least one circumference, and the blade quantity of each circumference of claw paddle is 1 ~ 5; Described control gear also comprises the upper-level control system of carrying out exchanges data with PLC, and the alarm be connected with PLC output terminal.
Utilization of the present invention and enforcement, its beneficial effect is mainly reflected in:
1. by the design of the inventive method, automatically detect actual liquid level in conjunction with laser range finder and external detector switch, solve paddle in reactor and block the difficult problem to laser measurement interference, the material liquid level precision that the method records can reach ± 3mm;
2. by automatically actual liquid level value being controlled discharging pump motor speed more afterwards with default level value, thus realization response still automatic liquid level detection and control, automatic control level is high, accuracy good, time saving and energy saving;
3. apparatus structure of the present invention is simple, reasonable in design, easy to operate, be applicable to level sensing and the control of each base polymer prepolymerization reaction still, alleviate labor strength, meet the Automated condtrol requirement that continuous process is produced, production efficiency is improved.
Accompanying drawing explanation
The vertical view of Tu1Shi testing agency of the present invention;
Structural representation under a kind of state of Tu2Shi testing agency of the present invention;
Structural representation under another state of Tu3Shi testing agency of the present invention;
Fig. 4 is the structural representation of control gear of the present invention.
Embodiment
Below in conjunction with accompanying drawing and instantiation, technical solution of the present invention is described in detail; the example lifted is only make generality to method and apparatus of the present invention to illustrate; object is to understand the present invention better, but example does not constitute any limitation protection scope of the present invention.The experimental technique related in the middle of example, if no special instructions, is conventional method; The material related to, if no special instructions, all can obtain from commercial channels.
According to technical solution of the present invention, for liquid level in the still of the prepolymerization reaction still of belt stirrer, the method for its automatic Detection & Controling comprises the following steps:
(1) laser range finder is set above reactor, outside at reactor, shaft is fixedly installed detection block, corresponding with detection block, be fixedly installed a detector switch, when making described detector switch monitor described detection block signal, paddle on shaft is in the position of not blocking laser range finder institute Emission Lasers, namely the detection block be fixedly installed on shaft rotates along with the rotation of shaft, and detector switch does not rotate with the rotation of shaft, detect block along with shaft rotate one week overlapping with detector switch, detector switch is made the signal stirring block to be detected, preferably horizontal being placed in reactor is taken out in described stirring.
(2) the distance value signal that laser range finder is tested is sent to PLC system in real time, when detector switch detects detection block signal, distance according to now laser range finder test obtains actual liquid level height in reactor, from Fig. 2 and Fig. 3, in described reactor, actual liquid level height equals the vertical range of laser range finder installation site to Polycondensation Reactor and Esterification Reactor and the difference of laser range finder test value.
(3) the actual liquid level height detected and default level value are compared by the PID module in PLC, the data are relatively used for controlling discharging pump frequency converter frequency to change discharging pump motor speed.When actual liquid level height is greater than default level value, improve discharging pump rotating speed, otherwise then reduce discharging pump rotating speed, thus reactor liquid level is effectively controlled.
Particularly, present invention further teaches the device of the automatic Detection & Controling of a kind of liquid level, stirring the Detection & Controling of prepolymerization reaction still automatic liquid level for being with.As shown in Figure 1 to 4, this device comprises testing agency and control gear, described testing agency comprises the horizontal shaft 1 be arranged in reactor, be arranged on the paddle 2 on described shaft 1, the laser range finder 3 arranged in reactor opening part top position, be fixedly installed on the detection block 4 exposed on shaft 1 outer wall of reactor outside, and detector switch 5 that is corresponding with described detection block 4, that be arranged on the outside fixed position of reactor.Described control gear, as shown in Figure 4, comprises the PLC 6 receiving laser range finder 3 and described detector switch 5 and transmit, and the discharging pump frequency converter 7 be connected with described PLC 6 output terminal and discharging motor 8.More specifically, described paddle 2 is the claw stirrer paddle combination comprising at least one circumference, and the blade quantity of each circumference of described claw paddle is 1 ~ 5; Described control gear also comprises the upper-level control system 9 of carrying out exchanges data with described PLC 6, and the alarm be connected with described PLC 6 output terminal.
For the prepolymerization reaction still with stirrer of p-aramid fiber production line, continue with reference to Fig. 1 ~ Fig. 4, the laser that laser range finder 3 is launched enters into band by the laser range finder point of irradiation position 11 being arranged on viewing window 10 above reactor and stirs in prepolymerization reaction still, shaft 1 rotating speed can tune between 5rpm ~ 120rpm, the part that shaft 1 is positioned at reactor inside is provided with paddle 2, described paddle 2 is the claw stirrer paddle combination comprising at least one circumference, the blade quantity of each circumference of described claw paddle is 1 ~ 5, as shown in Figure 1, the present embodiment paddle 2 comprises the claw stirrer paddle combination of 3 circumference.Laser range finder 3 can be arranged on above reactor directly over viewing window 10, paddle 2 has multiple period can block laser beam irradiation to actual liquid level in the process of rotating a circle, Fig. 2 maximumly blocks position, Fig. 3 is best unobstructed position, the laser that laser range finder 3 can be made to launch arrives material liquid surface 12, thus actual liquid level height detected.
During this prepolymerization reaction still actual motion, owing to can usually block the laser beam of being launched by laser range finder 3 in paddle 2 rotary course, the detection signal measured by laser range finder 3 sends into PLC 6 in real time, the signal of detector switch 5 also delivers to PLC 6, PLC 6 is screened the signal detected in real time, when detector switch 5 detects the position signalling detecting fast 4, the laser range finder signal now laser range finder 3 detected is as actual liquid level signal, accordingly the actual liquid level filtered out is compared with setting liquid level and carry out, by the frequency of the PID functional module operation control discharging pump frequency converter 7 in PLC 6, thus control the speed of discharging pump motor 8, ensure that above-mentioned band stirs the stable of material liquid level in prepolymerization reaction still, and the actual liquid level signal that can filter out records its numerical value of screen display by the DCS display be sent in upper location supervisory 9 by actual liquid level value that converts, or by setting the alarm range of level value, when actual liquid level value is in this alarm range, namely the alarm equipment alarm be connected with PLC 6 output terminal, the material liquid level that prompting band stirs in prepolymerization reaction still is in abnormal scope.
In sum, the present invention, by actual liquid level in laser range finder and the automatic detection reaction still of external detector switch, solves paddle in reactor and blocks a difficult problem to laser measurement interference, survey level accuracy and can reach ± 3mm.Based on this, actual liquid level value and default level value can be compared, automatically control discharging pump motor speed, thus the automatic detection and control of liquid level in realization response still still, its automatic control level is high, accuracy good, time saving and energy saving.Apparatus structure of the present invention is simple, reasonable in design, easy to operate, is applicable to level sensing and the control of each base polymer prepolymerization reaction still, alleviates labor strength, and meet the Automated condtrol requirement that continuous process is produced, production efficiency is improved.
Certainly, the above is only the preferred embodiment of the present invention, should be understood that, for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle, can also make some improvement and modification, these improve and modification also should be considered as covering scope of the present invention.
Claims (7)
1. band stirs the method for the automatic Detection & Controling of prepolymerization reaction still liquid level, it is characterized in that comprising the steps:
(1) laser range finder is set above reactor, the shaft exposing reactor outside is fixedly installed a detection block, this detection block rotates along with the rotation of shaft, separately one detector switch is set in the outside fixed position of reactor, when making it monitor described detection block signal, the paddle on shaft is in the position of not blocking laser range finder institute Emission Lasers;
(2) the distance value signal that laser range finder is tested is sent to PLC system in real time, when described detector switch detects detection block signal, obtains actual liquid level height in reactor according to the test value that now laser range finder records;
(3) by the actual liquid level height that detects and default level value, compared by the PID module in PLC, data are relatively for controlling discharging pump frequency converter frequency and then controlling discharging pump rotating speed, when actual liquid level height is greater than default level value, improve discharging pump rotating speed, otherwise then reduce discharging pump rotating speed, thus reactor liquid level is controlled.
2. band according to claim 1 stirs the method for the automatic Detection & Controling of prepolymerization reaction still liquid level, it is characterized in that: actual liquid level height in reactor, equal the difference of vertical range at the bottom of laser range finder installation site to reactor still and laser range finder test value.
3. the device of the automatic Detection & Controling of liquid level, for the automatic Detection & Controling with stirring prepolymerization reaction still liquid level, is characterized in that: comprise testing agency and control gear,
Described testing agency comprises: the horizontal shaft (1) be arranged in reactor, the paddle (2) be arranged on described shaft (1), the laser range finder (3) arranged in reactor opening part top position, be fixedly installed on expose reactor outside shaft (1) outer wall on detection block (4), and detector switch (5) that is corresponding with described detection block (4), that be fixedly installed on the outside fixed position of reactor;
Described control gear comprises: receive the PLC (6) that laser range finder (3) transmits with detector switch (5), the discharging pump frequency converter (7) be connected with described PLC (6) output terminal, and discharging motor (8).
4. the device of the automatic Detection & Controling of liquid level according to claim 3, is characterized in that: described paddle (2) is the claw stirrer paddle combination comprising at least one circumference.
5. the device of the automatic Detection & Controling of liquid level according to claim 4, is characterized in that: the blade quantity of each circumference of described claw paddle is 1 ~ 5.
6. the device of the automatic Detection & Controling of liquid level according to claim 3, is characterized in that: described control gear also comprises the upper-level control system (9) of carrying out exchanges data with described PLC (6).
7. the device of the automatic Detection & Controling of liquid level according to claim 3, is characterized in that: described control gear also comprises the alarm be connected with described PLC (6) output terminal.
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| CN201310472319.XA CN104571154B (en) | 2013-10-11 | 2013-10-11 | Automatic detection and control method and device for liquid level in pre-polycondensation reaction kettle with stirring function |
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| CN201310472319.XA CN104571154B (en) | 2013-10-11 | 2013-10-11 | Automatic detection and control method and device for liquid level in pre-polycondensation reaction kettle with stirring function |
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| CN104571154B CN104571154B (en) | 2017-05-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110975335A (en) * | 2019-11-27 | 2020-04-10 | 安徽天健环保股份有限公司 | Oil-water separation system for harmlessly treating swill and oil-water separation method thereof |
| CN112122054A (en) * | 2019-06-25 | 2020-12-25 | 宝山钢铁股份有限公司 | Device and method for controlling thickness of coating film of electrical steel |
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| JP2002054980A (en) * | 2000-08-08 | 2002-02-20 | Mitsubishi Chemicals Corp | Suspension level control method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112122054A (en) * | 2019-06-25 | 2020-12-25 | 宝山钢铁股份有限公司 | Device and method for controlling thickness of coating film of electrical steel |
| CN110975335A (en) * | 2019-11-27 | 2020-04-10 | 安徽天健环保股份有限公司 | Oil-water separation system for harmlessly treating swill and oil-water separation method thereof |
| CN110975335B (en) * | 2019-11-27 | 2021-09-24 | 安徽天健环保股份有限公司 | Oil-water separation system for harmlessly treating swill and oil-water separation method thereof |
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Address after: 211900 Changjiang Road West, Jiangsu, Yizheng, No. 1 Applicant after: SINOPEC YIZHENG CHEMICAL FIBRE Co.,Ltd. Applicant after: CHINA PETROLEUM & CHEMICAL Corp. Address before: 100728 Beijing, Chaoyangmen, North Street, No. 22, No. Applicant before: CHINA PETROLEUM & CHEMICAL Corp. Applicant before: SINOPEC YIZHENG CHEMICAL FIBRE Co.,Ltd. Address after: 100728 Beijing, Chaoyangmen, North Street, No. 22, No. Applicant after: CHINA PETROLEUM & CHEMICAL Corp. Applicant after: SINOPEC YIZHENG CHEMICAL FIBRE Co.,Ltd. Address before: 100728 Beijing, Chaoyangmen, North Street, No. 22, No. Applicant before: CHINA PETROLEUM & CHEMICAL Corp. Applicant before: SINOPEC Yizheng Chemical Fibre Co.,Ltd. |
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