CN112439364A - High-precision automatic liquid feeding device and method - Google Patents
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- 238000005303 weighing Methods 0.000 claims description 8
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J4/00—Feed or outlet devices; Feed or outlet control devices
- B01J4/02—Feed or outlet devices; Feed or outlet control devices for feeding measured, i.e. prescribed quantities of reagents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2204/00—Aspects relating to feed or outlet devices; Regulating devices for feed or outlet devices
- B01J2204/002—Aspects relating to feed or outlet devices; Regulating devices for feed or outlet devices the feeding side being of particular interest
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Abstract
The invention provides a high-precision liquid automatic feeding device and a method, wherein the device comprises: the device comprises a reaction kettle (1), a flow regulating valve (2), an electric valve positioner (3), a high-precision scale (4) and a DCS control system (5), wherein the flow regulating valve (2) and the electric valve positioner (3) are arranged on a feeding pipeline of the reaction kettle (1), and the high-precision scale (4) is arranged below the reaction kettle; the flow regulating valve (2), the electric valve positioner (3) and the high-precision scale (4) are in communication connection with a DCS control system (5); the weight change of the reaction kettle (1) in the reaction process is measured in real time through the high-precision scale (4), and the flow regulating valve (2) and/or the valve opening of the electric valve positioner (3) are/is adjusted according to the weight change. Therefore, the liquid material can be put in with high precision, the control precision is high, manual intervention is not needed, and the automation level of a factory is improved.
Description
Technical Field
The invention relates to the technical field of automatic control, in particular to a high-precision automatic liquid feeding device and method.
Background
In the production of reaction vessels, the introduction of liquid is often involved.
In the prior art, materials are generally weighed manually and then fed into a reaction kettle for reaction.
However, the feeding mode is discontinuous, uniform feeding cannot be achieved, the requirement on labor is high, feeding errors easily occur, supervision is not facilitated, and the requirement on high-precision material feeding cannot be met.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a high-precision automatic liquid feeding device and method.
In a first aspect, the present invention provides a high precision automatic liquid feeding device, comprising: the System comprises a reaction kettle, a flow regulating valve, an electric valve positioner, a high-precision scale and a DCS (Distributed Control System), wherein the flow regulating valve and the electric valve positioner are arranged on a feeding pipeline of the reaction kettle, and the high-precision scale is arranged below the reaction kettle; the flow regulating valve, the electric valve positioner and the high-precision scale are all in communication connection with the DCS control system; wherein:
the high-precision scale is used for measuring the weight change of the reaction kettle in the reaction process in real time, generating a first signal and sending the first signal to the DCS control system;
the DCS control system generates a second signal for adjusting the opening degree of the flow regulating valve and/or a third signal for adjusting the opening degree of the electric valve positioner according to the first signal;
the flow regulating valve is used for regulating the valve opening according to the second signal;
the electric valve positioner is used for adjusting the valve opening according to the third signal.
Optionally, the DCS control system is further configured to:
before starting, setting a target value and an advance of the feeding of the liquid material in the reaction kettle;
and after a starting instruction is received, adjusting the valve opening degrees of the flow regulating valve and the electric valve positioner according to the target value and the advance.
Optionally, the DCS control system is further configured to:
resolving the material amount currently put in the reaction kettle according to the first signal;
if the amount of the currently thrown materials is equal to the advance, closing the flow regulating valve and the electric valve positioner to stop throwing the materials;
and if the amount of the currently thrown materials is larger than the lead and exceeds the error range preset by the target value, sending an alarm prompt.
Optionally, the DCS control system is further configured to:
in the feeding process, if the occurrence of a valve fault or the abnormality of a high-precision weighing signal is detected, a pause program is started, and corresponding alarm information is sent out.
Optionally, the flow regulating valve comprises: a second stage valve; wherein the two-stage valve comprises: a small flow regulation mode and a two-stage regulation mode;
when the target value is smaller than a first threshold value, adopting a small flow regulation mode;
when the target value is not less than the first threshold value, a two-stage adjustment mode is employed.
Optionally, the flow regulating valve is a high-precision titration valve, the electric valve positioner is a SIPAT PS2 series, the high-precision scale is a Tollido IND331 model, and the DCS control system is ECS-700.
In a second aspect, the present invention provides a high-precision liquid automatic feeding method, which applies the high-precision liquid automatic feeding device according to any one of the first aspect, the method comprising:
step 1: before starting, setting a target value and an advance through a DCS (distributed control system);
step 2: after a starting instruction is received, the valve opening degrees of the flow regulating valve and the electric valve positioner are adjusted according to the target value and the lead;
and step 3: and measuring the weight change of the reaction kettle in the reaction process in real time through a high-precision scale, and adjusting the flow regulating valve and/or adjusting the valve opening of the electric valve positioner according to the weight change.
Optionally, the step 3 includes:
step 3.1: resolving the material amount currently put in the reaction kettle according to the weight change of the reaction kettle in the reaction process;
step 3.2: if the amount of the currently thrown materials is equal to the advance, closing the flow regulating valve and the electric valve positioner to stop throwing the materials;
step 3.3: and if the amount of the currently thrown materials is larger than the lead and exceeds the error range preset by the target value, sending an alarm prompt.
Optionally, the method further comprises:
in the feeding process, if the occurrence of a valve fault or the abnormality of a high-precision weighing signal is detected, a pause program is started, and corresponding alarm information is sent out.
Compared with the prior art, the invention has the following beneficial effects:
the high-precision automatic liquid feeding device and the high-precision automatic liquid feeding method provided by the invention solve the problems that the high-precision liquid feeding of the traditional reaction kettle is implemented purely manually and the management and control on material data, personnel safety and the like of a factory are lacked, improve the automation level of the factory, realize high-precision liquid material feeding, and have high control precision without manual intervention.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic structural diagram of a high-precision automatic liquid feeding device according to an embodiment of the present invention;
FIG. 2 is a flow chart of a high-precision automatic liquid feeding method provided by an embodiment of the present invention;
fig. 3 is a schematic display interface diagram of the DCS control system according to the embodiment of the present invention.
In the figure:
1-a reaction kettle;
2-a flow regulating valve;
3-electric valve positioner
4-high-precision weighing;
5-DCS control system.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
Fig. 1 is a schematic structural diagram of a high-precision automatic liquid feeding device provided in an embodiment of the present invention, and as shown in fig. 1, the device in the embodiment may include: the device comprises a reaction kettle 1, a flow regulating valve 2, an electric valve positioner 3, a high-precision scale 4 and a DCS control system 5, wherein the flow regulating valve 2 and the electric valve positioner 3 are arranged on a feed pipeline of the reaction kettle 1, and the high-precision scale 4 is arranged below the reaction kettle; the flow regulating valve 2, the electric valve positioner 3 and the high-precision scale 4 are in communication connection with a DCS control system 5; wherein: the high-precision scale 4 is used for measuring the weight change of the reaction kettle 1 in the reaction process in real time, generating a first signal and sending the first signal to the DCS control system 5; the DCS control system 5 generates a second signal for adjusting the valve opening degree of the flow regulating valve 2 and/or a third signal for adjusting the valve opening degree of the electric valve positioner 3 according to the first signal; the flow regulating valve 2 is used for regulating the valve opening according to a second signal; the electropneumatic valve positioner 3 is configured to adjust the valve opening degree according to a third signal.
In this embodiment, the high-precision scale 4 can be automatically controlled only after being cleared in the initial state. The numerical value on the high-precision scale 4 can automatically change along with the amount of the materials in the reaction kettle, and then the high-precision scale 4 transmits the numerical value to the DCS control system in real time.
Specifically, when the liquid material is fed according to the set target value, the DCS control system controls the flow control valve 2 and the electric valve positioner 3, for example, when the liquid material is first 100% opened, the electric valve positioner mounted at the head of the flow control valve also operates, and generates a corresponding opening signal to be transmitted to the DCS control system.
For example, the flow control valve 2 may be a two-stage valve; wherein, two-stage valve contains: a small flow regulation mode and a two-stage regulation mode; when the target value is smaller than a first threshold value, adopting a small flow regulation mode; when the target value is not less than the first threshold value, a two-stage adjustment mode is employed.
Specifically, when the liquid material is fed according to a set target value, the DCS control system controls a two-stage valve, such as: when the weight of the material is close to the target value, the two-section valve is changed into a small opening state (namely a small flow regulation mode), so that the flow speed of the liquid is reduced, and the liquid material can not enter the kettle too much.
Specifically, table 1 is the relevant test data for high precision dosing using a two-stage valve.
TABLE 1
| Valve position (two-stage) | Set weight (g) | Time (seconds) | Advance (g) | Actual weight (g) | Precision (g) |
| Small valve position | 10 | 6 | 3.5 | 10 | ±0 |
| Small valve position | 20 | 15 | 2 | 20 | ±0 |
| Small valve position | 30 | 30 | 2 | 28 | ±2 |
| Small valve position | 50 | 76 | 2 | 48 | ±2 |
| Small valve position | 80 | 217 | 2 | 78 | ±2 |
| Small valve position | 100 | 562 | 2 | 98 | ±2 |
| Full + small valve position | 150 | 76 | 10+2 | 148 | ±2 |
| Full + small valve position | 200 | 139 | 50+2 | 198 | ±2 |
| Full + small valve position | 300 | 480 | 150+2 | 298 | ±2 |
| Full + small valve position | 500 | 18 | 400+2 | 498 | ±2 |
| Full + small valve position | 600 | 1313 | 400+2 | 598 | ±2 |
| Full + small valve position | 600 | 253 | 500+2 | 598 | ±2 |
| Full + small valve position | 1000 | 48 | 900+2 | 1002 | ±2 |
Counting the test data by a stopwatch, wherein the error is less than 2 seconds; when the test data of the two-stage valve is below 150g, the small-flow valve is opened (adjustable, no specific scale exists, and the precision of one drop can reach 0.07 g). The test small flow valve is fixed at the same position, when the test small flow valve is larger than 150g, two-stage control is adopted (the advance of the first stage and the second stage needs to be set respectively), wherein the second stage valve is influenced by the pressure and the quality of compressed air. According to the test data, the error of the two-stage valve can be controlled to be +/-2 g.
Alternatively, the flow regulating valve 2 in the present embodiment may also be a high-precision titration valve, the electric valve positioner 3 is of SIPART PS2 series, the high-precision scale 4 is of toledo IND331 type, and the DCS control system 5 is of ECS-700 type.
For example, the flow control valve 2 in the present embodiment may also be a proportional control valve. Table 2 shows the data of the test related to the high-precision feeding of the proportional control valve.
TABLE 2
| Valve position (%) | Set weight (g) | Time (seconds) | Advance (g) | Actual weight (g) | Precision (g) |
| 6.5 | 10 | 12 | 6 | 12 | ±2 |
| 6.5 | 20 | 18 | 5 | 20 | ±0 |
| 6.5 | 30 | 27 | 5 | 30 | ±0 |
| 6.5 | 50 | 40 | 5 | 50 | ±0 |
| 6.5 | 80 | 67 | 5 | 82 | ±2 |
| 7 | 100 | 75 | 5 | 102 | ±2 |
| 7 | 150 | 108 | 6 | 152 | ±2 |
| 7 | 200 | 144 | 5 | 202 | ±2 |
| 7 | 300 | 214 | 6 | 300 | ±0 |
| 7 | 500 | 356 | 6 | 502 | ±2 |
| 8 | 600 | 415 | 10 | 598 | ±2 |
| 15 | 600 | 341 | 6 | 602 | ±2 |
| 15 | 1000 | 555 | 6 | 1004 | ±4 |
| 30 | 1000 | 206 | 15 | 1004 | ±4 |
| 30 | 1000 | 184 | 22 | 1002 | ±2 |
| 50 | 1000 | 54 | 72 | 998 | ±2 |
| 50 | 1000 | 55 | 70 | 1000 | ±0 |
Counting the test data by a stopwatch, wherein the error is less than 2 seconds; the test data of the proportional control valve is output by a fixed valve position; the control of the proportional regulating valve is affected by the following factors: compressed air pressure, mass, and positioner overshoot. According to the test data, the control error of the proportional control valve is +/-2 g; proportional control valves are easier to operate than two-stage valves.
Specifically, the wind force is simulated by the conventional electric fan, the first-gear wind speed can cause the error fluctuation of +/-2 g of the scale, the second-gear wind speed can cause the error fluctuation of +/-12 g of the scale, and the third-gear wind speed can cause the error fluctuation of +/-30 g of the scale. Since the vibration level is generally difficult to scale, a detailed description thereof will not be provided herein. All information of the test data is integrated, and under the condition that the environmental condition is stable, the device in the embodiment can be applied to an industrial field, so that high-precision liquid feeding is realized.
To sum up, this embodiment has solved traditional reation kettle high accuracy liquid and has thrown the material and purely lean on artifical implementation, to the problem of lack of management and control such as the material data of mill, personnel's safety, has improved the automation level of mill, can realize that high accuracy ground liquid material puts in, and control accuracy is high, need not artificial intervention.
Illustratively, the DCS control system 5 is also configured to: before starting, setting a target value and an advance of the feeding of the liquid material in the reaction kettle 1; after receiving the starting instruction, the valve opening degrees of the flow regulating valve 2 and the electric valve positioner 3 are adjusted according to the target value and the advance.
In the embodiment, the liquid material enters the reaction kettle 1 through the flow regulating valve 2 on the process pipeline; a first control instruction of the flow regulating valve 2 is sent out by a DCS (distributed control system) 5; the flow regulating valve 2 drives the electric valve positioner 3 to act after responding to the control instruction; after the electric valve positioner 3 acts, a signal is generated and transmitted back to the DCS control system 5; after the liquid material enters the reaction kettle 1, the high-precision scale 4 can generate a signal; the signal generated by the high-precision scale 4 is transmitted to the DCS control system 5, and the DCS control system 5 sends a second control instruction to the flow regulating valve 2 according to the received signal; and analogizing in turn, and sending a closing instruction to the flow regulating valve 2 by the DCS control system 5 until the high-precision scale 4 reaches the target value.
Illustratively, the DCS control system 5 is also configured to: resolving the material amount currently put in the reaction kettle 1 according to the first signal; if the amount of the currently thrown materials is equal to the advance, closing the flow regulating valve 2 and the electric valve positioner 3 to stop throwing the materials; and if the amount of the currently put materials is larger than the advance and exceeds the error range preset by the target value, sending an alarm prompt.
Fig. 3 is a schematic diagram of a display interface of the DCS control system according to the embodiment of the present invention, referring to fig. 3, in the embodiment, a target value and an advance are set in advance in the DCS control system; after the DCS responds to the starting command, the valve is opened on the premise that the overall condition of the current equipment meets the production condition; and the DCS performs valve opening adjustment according to the real-time data transmitted by the high-precision scale. When the high precision is called to reach the lead, the DCS control system closes the valve to ensure that the final feeding amount is as close as possible to the target value, and the final feeding amount is preferably within the error range of the process requirement. If the final error is too large, the DCS control system sends corresponding alarm information.
Illustratively, the DCS control system 5 is also configured to: in the feeding process, if the occurrence of a valve fault or the abnormality of a high-precision weighing signal is detected, a pause program is started, and corresponding alarm information is sent out.
In the embodiment, the automatic feeding is used for realizing the liquid feeding control, and the efficiency is higher than that of the traditional manual feeding; the feeding precision is high, and the applicable liquid feeding types are more. High precision dosing can be achieved by using both custom made two-stage valves and high quality inlet valves, where the tightness and pipe diameter size of the process pipe also require adaptation of the custom made valves and inlet valves. The device in this embodiment can be generalized to more industrial sites and valve manufacturers. The apparatus in the present embodiment is also applicable to various control systems such as DCS or PLC.
According to the embodiment, the problem that a common valve cannot be directly used in the traditional high-precision feeding process is solved, the valve model selection and the environmental requirements are given, and the automatic production process is more suitable for the current process production. The invention can replace the industrial scene of manual weighing in a laboratory and manual feeding in a reaction kettle. This also promotes the entire enterprise's HSE management hierarchy (health, security and environmental management hierarchy) to a higher level. Therefore, the embodiment of the invention not only saves considerable construction cost for enterprises, but also indirectly promotes transformation and upgrading of the enterprises.
Further, fig. 3 is a schematic view of a display interface of the DCS control system provided in the embodiment of the present invention, and as shown in fig. 3, the method in the embodiment may apply the above-mentioned high-precision automatic liquid feeding device, and the method includes:
step S101: before starting, a target value and an advance are set through a DCS control system.
Step S102: and after receiving a starting instruction, adjusting the valve opening degrees of the flow regulating valve and the electric valve positioner according to the target value and the advance.
Step S103: the weight change of the reaction kettle in the reaction process is measured in real time through a high-precision scale, and the flow regulating valve and/or the valve opening of the electric valve positioner are/is adjusted according to the weight change.
Illustratively, step S103 includes: resolving the material amount currently put in the reaction kettle according to the weight change of the reaction kettle in the reaction process; if the amount of the currently thrown materials is equal to the advance, closing the flow regulating valve and the electric valve positioner to stop throwing the materials; and if the amount of the currently put materials is larger than the advance and exceeds the error range preset by the target value, sending an alarm prompt.
Illustratively, the method further comprises: in the feeding process, if the occurrence of a valve fault or the abnormality of a high-precision weighing signal is detected, a pause program is started, and corresponding alarm information is sent out.
It should be noted that, the steps in the high-precision automatic liquid feeding method provided by the present invention may be implemented by using corresponding modules, units, and the like in the high-precision automatic liquid feeding device, and those skilled in the art may refer to the technical scheme of the device to implement the step flow of the method, that is, the embodiments in the device may be understood as preferred examples for implementing the method, and are not described herein again.
Those skilled in the art will appreciate that, in addition to implementing the apparatus and its various modules provided by the present invention in purely computer readable program code means, the apparatus and its various modules provided by the present invention can be implemented with the same functionality in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like, all by logically programming method steps. Therefore, the device and its various modules provided by the present invention can be considered as a hardware component, and the device included in the present invention for implementing various functions can also be considered as a structure in the hardware component; means for performing the functions may also be regarded as structures within both software modules and hardware components for performing the methods.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (9)
1. The utility model provides a liquid automatic feeding device of high accuracy which characterized in that includes: the device comprises a reaction kettle (1), a flow regulating valve (2), an electric valve positioner (3), a high-precision scale (4) and a DCS control system (5), wherein the flow regulating valve (2) and the electric valve positioner (3) are installed on a feeding pipeline of the reaction kettle (1), and the high-precision scale (4) is installed below the reaction kettle; the flow regulating valve (2), the electric valve positioner (3) and the high-precision scale (4) are in communication connection with the DCS control system (5); wherein:
the high-precision scale (4) is used for measuring the weight change of the reaction kettle (1) in the reaction process in real time, generating a first signal and sending the first signal to the DCS control system (5);
the DCS control system (5) generates a second signal for adjusting the valve opening degree of the flow regulating valve (2) and/or a third signal for adjusting the valve opening degree of the electric valve positioner (3) according to the first signal;
the flow regulating valve (2) is used for regulating the valve opening according to the second signal;
the electric valve positioner (3) is used for adjusting the valve opening according to the third signal.
2. The high-precision automatic liquid dosing device according to claim 1, characterized in that said DCS control system (5) is further adapted to:
before starting, setting a target value and an advance of the feeding of the liquid material in the reaction kettle (1);
and after a starting instruction is received, adjusting the valve opening degrees of the flow regulating valve (2) and the electric valve positioner (3) according to the target value and the advance.
3. The high-precision automatic liquid dosing device according to claim 2, characterized in that the DCS control system (5) is further adapted to:
resolving the material amount currently put into the reaction kettle (1) according to the first signal;
if the amount of the currently thrown materials is equal to the advance, closing the flow regulating valve (2) and the electric valve positioner (3) to stop throwing the materials;
and if the amount of the currently thrown materials is larger than the lead and exceeds the error range preset by the target value, sending an alarm prompt.
4. The high-precision automatic liquid dosing device according to claim 1, characterized in that said DCS control system (5) is further adapted to:
in the feeding process, if the occurrence of a valve fault or the abnormality of a high-precision weighing signal is detected, a pause program is started, and corresponding alarm information is sent out.
5. The high precision automatic liquid dosing device according to any of claims 1-4, characterized by the flow regulating valve (2) comprising: a second stage valve; wherein the two-stage valve comprises: a small flow regulation mode and a two-stage regulation mode;
when the target value is smaller than a first threshold value, adopting a small flow regulation mode;
when the target value is not less than the first threshold value, a two-stage adjustment mode is employed.
6. The high-precision automatic liquid dosing device according to any one of claims 1-4, wherein the flow regulating valve (2) is a high-precision titration valve, the electric valve positioner (3) is of SIPAT PS2 series, the high-precision scale (4) is of Torilduo IND331 type, and the DCS control system (5) is of ECS-700 type.
7. A high-precision liquid automatic feeding method, which is characterized by applying the high-precision liquid automatic feeding device as claimed in any one of claims 1 to 6, the method comprising:
step 1: before starting, a target value and an advance are set through a DCS (5);
step 2: after a starting instruction is received, the valve opening degrees of the flow regulating valve (2) and the electric valve positioner (3) are adjusted according to the target value and the advance;
and step 3: the weight change of the reaction kettle (1) in the reaction process is measured in real time through the high-precision scale (4), and the flow regulating valve (2) is adjusted and/or the valve opening of the electric valve positioner (3) is adjusted according to the weight change.
8. The high-precision automatic liquid feeding method according to claim 7, wherein the step 3 comprises:
step 3.1: resolving the material amount currently put in the reaction kettle (1) according to the weight change of the reaction kettle (1) in the reaction process;
step 3.2: if the amount of the currently thrown materials is equal to the advance, closing the flow regulating valve (2) and the electric valve positioner (3) to stop throwing the materials;
step 3.3: and if the amount of the currently thrown materials is larger than the lead and exceeds the error range preset by the target value, sending an alarm prompt.
9. The high precision automatic liquid dosing method of claim 7, further comprising:
in the feeding process, if the occurrence of a valve fault or the abnormality of a high-precision weighing signal is detected, a pause program is started, and corresponding alarm information is sent out.
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| 唐文炳: "《电子衡器使用与维修》", 30 November 2005, 中国计量出版社 * |
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