CN112730009A - Pretreatment device and pretreatment method for chemical process on-line analyzer - Google Patents
Pretreatment device and pretreatment method for chemical process on-line analyzer Download PDFInfo
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- 238000001311 chemical methods and process Methods 0.000 title claims abstract description 22
- 238000002203 pretreatment Methods 0.000 title claims description 7
- 239000007788 liquid Substances 0.000 claims abstract description 357
- 238000005070 sampling Methods 0.000 claims abstract description 46
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- 239000007924 injection Substances 0.000 description 2
- 238000004886 process control Methods 0.000 description 2
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- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L15/00—Devices or apparatus for measuring two or more fluid pressure values simultaneously
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
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- G01L19/086—Means for indicating or recording, e.g. for remote indication for remote indication
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- G01N1/00—Sampling; Preparing specimens for investigation
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N2001/1031—Sampling from special places
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- G01N1/20—Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials
- G01N1/2035—Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials by deviating part of a fluid stream, e.g. by drawing-off or tapping
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Abstract
The invention relates to a pretreatment device of a chemical process on-line analyzer, which comprises a controller, a liquid container to be detected, a circulating pump, a filter, a liquid inlet pressure sensor and a liquid outlet pressure sensor, wherein the liquid inlet pressure sensor is arranged at the top of the filter, the liquid outlet pressure sensor is arranged at a liquid outlet of the filter, a main circulation pipeline is communicated with the liquid container to be measured, the circulation pump is arranged on the main circulation pipeline, a liquid output pipeline is communicated with the main circulation pipeline, the liquid output pipeline is communicated with a liquid input pipeline which is communicated with a liquid inlet of the filter, the filter is also communicated with a liquid container to be measured through a liquid return pipeline, the liquid return pipeline is communicated with a sampling pipeline, the liquid output pipeline is provided with a first ball valve and a second ball valve, and a third ball valve is arranged on the liquid input pipeline, and the liquid inlet pressure sensor and the liquid outlet pressure sensor are both in communication connection with the controller. Has the advantages that: the detection precision is improved, and the service life and the maintenance period of the analyzer are prolonged.
Description
Technical Field
The invention relates to the technical field of on-line analysis of chemical process, wherein the chemical process can be chemical surface treatment or a production process related to liquid chemicals, and can also be raw water, industrial wastewater and reuse water related to the production process; in particular to a pretreatment device and a pretreatment method of an online analyzer.
Background
In the process of industrial production changing from labor intensive to technology intensive, a large number of enterprises begin to use various online analytical instruments in the past decades to improve the automation degree, improve the process control capability, reduce the labor injury and the labor intensity, and replace manual long-term attendance.
Because the on-line analyzer belongs to a relatively precise instrument, some key parts, such as an electromagnetic valve, a rotary valve, a plunger pump, an injection pump and the like, can not bear large and small particle impurities or high pressure in a liquid sample due to the limitation of the technology, materials and the like, the detection result of the on-line analyzer is inaccurate, and therefore, relatively serious negative effects are brought to the process control, even production accidents and casualties are caused. On the one hand, the reason for this is that the large and small particles can cause blockage of the pipeline or internal wear of critical parts, so that the detection result is affected. The large particulate matter may be inorganic or organic, or a mixture of both. It is common experience that particles having a size of more than 50 microns may cause irreversible damage or clogging of critical components, the extent of damage varying due to the physical properties of the particles themselves. On the other hand, when the pressure of the sampling point is greater than the highest pressure value that the inlet valve body can bear, the valve body is broken, accurate sampling cannot be carried out, and therefore the accuracy of the measuring result is lost.
The pretreatment mode of the on-line analyzer in the chemical process still stays in a simpler mode at present, namely a filter is connected in series in front of the analyzer. There are some problems with this approach. Firstly, there are use and maintenance problems, namely if the filter element aperture is too small, the filter is easy to block and maintain at a high frequency, and an operator cannot find the filter block in time and maintain the filter, and if the filter element aperture is large, the filter cannot achieve the purpose, and the instrument part is worn. Second, if the sampling point pressure is high, the accuracy of the detection result is also affected. Thirdly, based on the above problems, unattended application conditions cannot be achieved, and personnel need to periodically check whether the filter element is clogged. Fourthly, when the pipeline at the sampling point has no pressure, the pretreatment pipeline cannot identify whether the online analyzer can sample or not. Fifthly, because the current pretreatment mode does not provide automatic updating of the liquid to be measured in the filter, the sampling of the online analyzer has no timeliness, i.e. the current real situation of the liquid to be measured cannot be represented. In order to compensate for the timeliness problem, the work of liquid renewal can only be completed by the on-line analyzer, and in fact most on-line analyzers do not support the function, and even if the function is supported, the renewable volume and the difference between the filter volume and the pipeline volume are large.
Disclosure of Invention
In order to solve the problems, the invention provides a set of high-reliability pretreatment scheme of an automatic online analyzer, and the functions of the pretreatment scheme include filtering particles, reducing the pressure of pipeline pressure on an instrument valve body, providing sampling timeliness, unattended alarming at any time, high-reliability self-diagnosis, backwashing and filter element replacement step-type easy maintenance modes.
The technical scheme is as follows,
a pretreatment device of a chemical process on-line analyzer is characterized by comprising a controller, a liquid container to be measured, a circulating pump, a filter, a liquid inlet pressure sensor and a liquid outlet pressure sensor, wherein the filter is provided with a liquid inlet, a liquid outlet, an overflow port and a sewage discharge port, a sewage discharge valve is arranged at the sewage discharge port, an overflow valve is arranged at the overflow port, the liquid inlet pressure sensor is arranged at the top of the filter, the liquid outlet pressure sensor is arranged at the liquid outlet of the filter, a main circulating pipeline is communicated with the liquid container to be measured, the circulating pump is arranged on the main circulating pipeline, a liquid output pipeline is communicated with the main circulating pipeline, a liquid input pipeline is communicated with the liquid inlet of the filter, the liquid that awaits measuring among the liquid container that will await measuring is imported to in the filter, the filter still through return liquid pipeline with the liquid container intercommunication that awaits measuring return liquid pipeline intercommunication have with the sampling pipeline of on-line analyzer intercommunication install first ball valve on the anterior segment of liquid output pipeline, install the second ball valve on its back end install the third ball valve on the liquid input pipeline, feed liquor pressure sensor and play liquid pressure sensor all with the controller communication is connected.
As a further improvement, the starting end of the liquid return pipeline is connected to the liquid outlet, the sampling pipeline is installed at the starting end of the liquid return pipeline, the sampling pipeline is located behind the liquid outlet pressure sensor, the normally closed electromagnetic valve is installed at the front section of the liquid return pipeline, the fourth ball valve is installed at the rear section of the liquid return pipeline, and the tail end of the liquid output pipeline is connected to the liquid return pipeline through a three-way connecting piece.
As a further improvement, the starting end of the liquid return pipeline is installed on the overflow port, the overflow valve is installed at the front end of the liquid return pipeline, the pretreatment device further comprises a flow cell, a liquid outlet of the filter is connected with a first liquid return branch, the tail end of the first liquid return branch is communicated with the flow cell, the front section of the liquid return pipeline is further connected with a second liquid return branch through a three-way connection piece, the tail end of the second liquid return branch is communicated with the flow cell, the tail end of the liquid output pipeline is connected to the first liquid return branch through a three-way connection piece, the first liquid return branch is further provided with an inlet electromagnetic valve, the second liquid return branch is further provided with an outlet electromagnetic valve, and the sampling pipeline is installed on the second liquid return branch.
As a further improvement, a liquid level meter is further installed in the flow cell, and an overflow port is further formed in the top of the flow cell and used for communicating the atmosphere.
As a further improvement, the liquid level meter is a floating ball liquid level meter.
As a further improvement, the liquid level meter is an ultrasonic liquid level meter.
A pretreatment method of a chemical process on-line analyzer is characterized by comprising the following steps:
s1, before use, the first ball valve, the third ball valve and the overflow valve need to be opened, the second ball valve is closed, the filter is filled with liquid to be tested, when the liquid overflow at the top overflow port is observed, the overflow valve is closed, and when the filter is used daily, the overflow valve is in a normally closed state except for manual intervention maintenance;
s2, judging whether the main circulation pipeline normally runs or not through the pressure value of the liquid inlet pressure sensor, determining that the main circulation pipeline meets the starting condition and the requirement of the filtering driving force, and judging that the pressure difference between the liquid inlet pressure sensor and the liquid outlet pressure sensor is observed under the condition that the filtering driving force requirement is met; if the pressure difference is smaller than the preset value, the liquid to be detected filtered by the filter returns to the liquid container to be detected through the liquid return pipeline for continuous circulation; if the pressure difference is larger than or equal to the preset value, the side can not continue to circulate, the controller control device stops running and gives an alarm, the normally closed electromagnetic valve is opened to reduce the pressure, the pressure difference between the liquid inlet pressure sensor and the liquid outlet pressure sensor is confirmed again, and whether a filter element of the filter is blocked or not is judged;
s3, if the blockage occurs, manual back flushing is required: closing the third ball valve, opening the second ball valve and the first normally closed solenoid valve, allowing liquid in the liquid container to be detected to enter a liquid return pipeline through a liquid output pipeline, allowing the liquid to enter a filter from the liquid return pipeline for back washing, and finally opening a drain valve to discharge waste liquid from a drain port;
and S4, after the waste liquid is emptied, closing the blowdown valve and the second ball valve, opening the third ball valve to continue liquid circulation in the device, and during sampling, closing the normally closed electromagnetic valve and sampling the online analyzer from the sampling pipeline for analysis.
As a further improvement, the pretreatment method of the chemical process on-line analyzer comprises the following steps:
s1, before use, the first ball valve, the third ball valve and the overflow valve need to be opened, the second ball valve is closed, the filter is filled with liquid to be tested, when the liquid overflow at the top overflow port is observed, the overflow valve is closed, and when the filter is used daily, the overflow valve is in a normally closed state except for manual intervention maintenance;
s2, judging whether the main circulation pipeline normally runs or not through the pressure value of the liquid inlet pressure sensor, determining that the main circulation pipeline meets the starting condition and the requirement of the filtering driving force, and judging that the pressure difference between the liquid inlet pressure sensor and the liquid outlet pressure sensor is observed under the condition that the filtering driving force requirement is met; if the pressure difference is smaller than the preset value, the liquid to be detected filtered by the filter returns to the liquid container to be detected through the liquid return pipeline for continuous circulation; if the pressure difference is greater than or equal to the preset value, the side can not continue to circulate, and the controller control device stops running and gives an alarm;
s3, keeping the inlet electromagnetic valve in a closed state, opening the outlet electromagnetic valve, draining liquid in the flow cell through gravity drainage, opening the inlet electromagnetic valve and the outlet electromagnetic valve after checking and confirming that the liquid in the flow cell is drained, and confirming the pressure difference between the liquid inlet pressure sensor and the liquid outlet pressure sensor so as to judge whether pressure reduction is successful;
s4, if the pressure reduction is unsuccessful, the filter element in the filter is blocked, and the filter needs to be cleaned by manual intervention and backwashing: closing the third ball valve, opening the second ball valve, allowing liquid in the liquid container to be detected to enter the first liquid return branch through the liquid output pipeline, allowing the liquid to enter the filter from the first liquid return branch for backwashing, and finally opening the drain valve to discharge waste liquid from the drain port;
and S5, after the waste liquid is emptied, closing the blowdown valve and the second ball valve, opening the third ball valve to continue liquid circulation in the device, closing the outlet electromagnetic valve during sampling, and sampling by the online analyzer from the sampling pipeline for analysis.
Advantageous effects
The beneficial effects are that: the invention simultaneously achieves the dual purposes of filtering particles and reducing the pressure of the liquid to be detected, meets the basic requirement of the analyzer on the liquid to be detected, improves the detection precision, and prolongs the service life and the maintenance period of the analyzer. The requirement of unmanned on duty is satisfied, if need maintain, for example when needing back flush or change the filter core, remind in real time through the sensor. It is generally desired that the sampling point be in the recycle line, i.e. be self-pressurized. The production line condition can be pre-judged through the pressure sensor, the production line condition and the production line can work synchronously, namely, the production line has no pressure at a sampling point when not producing, and then the pretreatment can not be carried out. Sampling of liquid samples is time-sensitive, i.e. each sampling is intended to take a sample that represents the current state of the liquid to be measured. The invention provides the pipeline liquid updating and circulation in the pretreatment stage, and then the online analyzer carries out sample injection analysis. And closed-loop control is realized through upper computer control, and the operation reliability is improved.
Drawings
The invention is further explained with the embodiment in the following.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a flow cell according to the present invention.
Reference numbers in the figures:
1. liquid container 2 to be tested, circulating pump 3 and filter
301. A night inlet 302, a liquid outlet 303 and an overflow port
304. Drain 4, liquid inlet pressure sensor 5 and liquid outlet pressure sensor
6. Blowoff valve 7, overflow valve 8 and main circulation pipeline
9. Liquid output pipeline 10, liquid input pipeline 11 and liquid return pipeline
12. Sampling pipeline 13, first ball valve 14 and second ball valve
15. A third ball valve 16, a normally closed solenoid valve 17 and a fourth ball valve
18. Flow cell 1801, overflow port 19, first liquid return branch
20. A second liquid return branch 21, an inlet solenoid valve 22 and an outlet solenoid valve
23. Liquid level meter
Detailed Description
So that the manner in which the above recited features of the present invention can be understood and readily understood, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings, wherein:
as shown in fig. 1, a pretreatment device of a chemical process on-line analyzer comprises a controller, a liquid container 1 to be measured, a circulating pump 2, a filter 3, a liquid inlet pressure sensor 4 and a liquid outlet pressure sensor 5, wherein the filter 3 is provided with a liquid inlet 301, a liquid outlet 302, an overflow port 303 and a sewage outlet 304, a sewage valve 6 is arranged at the sewage outlet 304, an overflow valve 7 is arranged at the overflow port 303, the liquid inlet pressure sensor 4 is arranged at the top of the filter 3, the liquid outlet pressure sensor 5 is arranged at the liquid outlet 302 of the filter 3, a main circulating pipeline 8 is communicated with the liquid container 1 to be measured, the circulating pump 2 is arranged on the main circulating pipeline 8, a liquid output pipeline 9 is communicated with the main circulating pipeline 8, a liquid input pipeline 10 is communicated with the liquid output pipeline 9, the liquid input pipeline 10 is communicated with the liquid inlet 301 of the filter 3, the liquid to be detected in the liquid container 1 to be detected is input into the filter 3, the filter 3 is also communicated with the liquid container 1 to be detected through the liquid return pipeline 11, the liquid filtered in the filter 3 flows back into the liquid container to be detected, and the liquid to be detected is circulated in such a way so as to keep the cleanliness of the liquid to be detected. The liquid return pipeline 11 is communicated with a sampling pipeline 12 communicated with an online analyzer, and the circulating liquid is pre-detected by the online analyzer arranged at the position so as to ensure the sampling analysis result of the liquid to be detected at a detection point. The front section of the liquid output pipeline 9 is provided with a first ball valve 13 for controlling liquid output, and the liquid output pipeline 9 and the liquid in the filter 3 can be controlled to be renewed and returned to the filter 3, so that the purpose that a liquid sample obtained by a sampling pipeline 12 connected with a subsequent online analyzer has timeliness and representativeness, and chemicals are not additionally consumed is achieved. The second ball valve 14 is installed on the rear section of the liquid output pipeline, when the filter 3 is backwashed, the second ball valve 14 needs to be opened, the third ball valve 15 is installed on the liquid input pipeline 10 and used for controlling whether liquid in the liquid input pipeline is output to the filter 3, and the liquid inlet pressure sensor 4 and the liquid outlet pressure sensor 5 are in communication connection with the controller. The starting end of the liquid return pipeline 11 is connected to the liquid outlet 302, the sampling pipeline 12 is installed at the starting end of the liquid return pipeline 11 and is positioned behind the liquid outlet pressure sensor 5, the normally closed electromagnetic valve 16 is installed at the front section of the liquid return pipeline 11, the fourth ball valve 17 is installed at the rear section of the liquid return pipeline 11, and the tail end of the liquid output pipeline 9 is connected to the liquid return pipeline 11 through a three-way connecting piece.
As shown in fig. 2, a pretreatment device of a chemical process on-line analyzer comprises a controller, a liquid container 1 to be measured, a circulating pump 2, a filter 3, a liquid inlet pressure sensor 4 and a liquid outlet pressure sensor 5, wherein the filter 3 is provided with a liquid inlet 301, a liquid outlet 302, an overflow port 303 and a sewage outlet 304, a sewage valve 6 is arranged at the sewage outlet 304, an overflow valve 7 is arranged at the overflow port 303, the liquid inlet pressure sensor 4 is arranged at the top of the filter 3, the liquid outlet pressure sensor 5 is arranged at the liquid outlet 302 of the filter 3, a main circulating pipeline 8 is communicated with the liquid container 1 to be measured, the circulating pump 2 is arranged on the main circulating pipeline 8, a liquid output pipeline 9 is communicated with the main circulating pipeline 8, a liquid input pipeline 10 is communicated with the liquid output pipeline 9, the liquid input pipeline 10 is communicated with the liquid inlet 301 of the filter 3, the liquid to be detected in the liquid container 1 to be detected is input into the filter 3, the filter 3 is also communicated with the liquid container 1 to be detected through the liquid return pipeline 11, the liquid filtered in the filter 3 flows back into the liquid container to be detected, and the liquid to be detected is circulated in such a way so as to keep the cleanliness of the liquid to be detected. The liquid return pipeline 11 is communicated with a sampling pipeline 12 communicated with an online analyzer, and the circulating liquid is pre-detected by the online analyzer arranged at the position so as to ensure the sampling analysis result of the liquid to be detected at a detection point. The front section of the liquid output pipeline 9 is provided with a first ball valve 13 for controlling liquid output, and the liquid output pipeline 9 and the liquid in the filter 3 can be controlled to be renewed and returned to the filter 3, so that the purpose that a liquid sample obtained by a sampling pipeline 12 connected with a subsequent online analyzer has timeliness and representativeness, and chemicals are not additionally consumed is achieved. The second ball valve 13 is installed on the rear section of the liquid output pipeline, when the filter 3 is backwashed, the second ball valve 13 needs to be opened, the third ball valve 14 is installed on the liquid input pipeline 10 and used for controlling whether liquid in the liquid input pipeline is output to the filter 3, and the liquid inlet pressure sensor 4 and the liquid outlet pressure sensor 5 are in communication connection with the controller. The initial end of the liquid return pipeline 11 is arranged on the overflow port 303, the overflow valve 7 is arranged on the front end of the liquid return pipeline 11, the pretreatment device further comprises a flow cell 18, a liquid outlet 302 of the filter 3 is connected with a first liquid return branch 19, the tail end of the first liquid return branch 19 is communicated with the flow cell 18, liquid enters the flow cell 18 through the first liquid return branch 19, the front section of the liquid return pipeline 11 is further connected with a second liquid return branch 20 through a three-way connecting piece, the tail end of the second liquid return branch 20 is communicated with the flow cell 18, liquid returns to the return pipeline 11 through the second liquid return branch 20, the tail end of the liquid output pipeline 9 is connected to the first liquid return branch 19 through the first liquid return branch 19 during backwashing, the liquid returns to the filter 3 through the liquid output pipeline 9 through the first liquid return branch 19, the first liquid return branch 19 is further provided with an inlet electromagnetic valve 21, the second liquid return branch 20 is further provided with an outlet electromagnetic valve 22, the sampling line 12 is mounted on the second liquid return branch 20. The device has the function of pressure reduction through the arrangement of the flow cell, when the pressure is reduced, the inlet electromagnetic valve 21 is kept in a closed state, the outlet electromagnetic valve 22 is opened, liquid is discharged through gravity, whether liquid in the flow cell 18 is emptied or not is determined through the liquid level meter 23 arranged on the flow cell 18, after the emptying is determined, the inlet electromagnetic valve 21 and the outlet electromagnetic valve 22 are opened simultaneously, the pressure difference between the liquid inlet pressure sensor 4 and the liquid outlet pressure sensor 5 is determined, whether the pressure reduction purpose is achieved or not is determined, and whether the filter element in the filter 3 is blocked or not can be determined through the success of the pressure reduction. The top of the flow cell 18 is also provided with an overflow port 1801 for venting air to ensure depressurization. The liquid level meter 23 is a floating ball liquid level meter and can also be an ultrasonic liquid level meter, and is changed according to actual use conditions.
A method for pretreating an on-line analyzer for chemical process, as shown in fig. 1, comprising the steps of:
s1, before use, the first ball valve 13, the third ball valve 15 and the overflow valve 7 need to be opened, the second ball valve 14 is closed, the filter is filled with liquid to be measured, when liquid overflow is observed at the top overflow port, the overflow valve is closed, and when the filter is used daily, the overflow valve 7 is in a normally closed state except for manual intervention maintenance;
s2, judging whether the main circulation pipeline normally runs or not through the pressure value of the liquid inlet pressure sensor 4, determining that the main circulation pipeline meets the starting condition and meets the requirement of the filtering driving force, and judging that the pressure difference between the liquid inlet pressure sensor 4 and the liquid outlet pressure sensor 5 is observed under the condition that the filtering driving force requirement is met; if the pressure difference is smaller than the preset value, the liquid to be detected filtered by the filter 3 returns to the liquid container 1 to be detected through the liquid return pipeline 11 for continuous circulation; if the pressure difference is larger than or equal to the preset value, the side can not continue to circulate, the controller control device stops running and gives an alarm, and the normally closed electromagnetic valve 16 is opened to reduce the pressure. After the pressure is reduced, the pressure difference between the liquid inlet pressure sensor 4 and the liquid outlet pressure sensor 5 is confirmed again, and whether the filter element of the filter 3 is blocked or not is judged;
s3, if the filter element of the filter 3 is blocked, manual back washing is needed: closing the third ball valve 15, opening the second ball valve 14 and the normally closed solenoid valve 16, allowing the liquid in the liquid container to be detected to enter the liquid return pipeline 11 through the liquid output pipeline, allowing the liquid to enter the filter 3 from the liquid return pipeline 11 for back washing, and finally opening the blow-down valve 6 to discharge the waste liquid from the blow-down port;
and S4, after the waste liquid is emptied, closing the blowdown valve 6 and the second ball valve 14, opening the third ball valve 15 to continue liquid circulation in the device, and during sampling, closing the normally closed electromagnetic valve 16, and sampling by the online analyzer from the sampling pipeline for analysis.
A method for pretreating an on-line analyzer for chemical process, as shown in fig. 2, comprising the steps of:
s1, before use, the first ball valve 13, the third ball valve 15 and the overflow valve 7 need to be opened, the second ball valve 14 is closed, the filter 3 is filled with liquid to be measured, when liquid overflow at the top overflow port 303 is observed, the overflow valve 7 is closed, and during daily use, except for manual intervention maintenance, the overflow valve 7 is in a normally closed state;
s2, judging whether the main circulation pipeline normally runs or not through the pressure value of the liquid inlet pressure sensor 4, determining that the main circulation pipeline meets the starting condition and meets the requirement of the filtering driving force, and judging that the pressure difference between the liquid inlet pressure sensor and the liquid outlet pressure sensor is observed under the condition that the filtering driving force requirement is met; if the pressure difference is smaller than the preset value, the liquid to be detected filtered by the filter 3 returns to the liquid container 3 to be detected through the liquid return pipeline 11 for continuous circulation; if the pressure difference is greater than or equal to the preset value, the side can not continue to circulate, and the controller control device stops running and gives an alarm;
s3, keeping the inlet electromagnetic valve 21 in a closed state, opening the outlet electromagnetic valve 22, draining liquid in the flow cell 18 through gravity drainage, opening the inlet electromagnetic valve 21 and the outlet electromagnetic valve 22 after checking and confirming that the liquid in the flow cell 18 is drained, and confirming the pressure difference between the liquid inlet pressure sensor 4 and the liquid outlet pressure sensor 5, so as to judge whether pressure reduction is successful;
s4, if the pressure reduction is unsuccessful, the filter element in the filter 3 is blocked, and the filter needs to be cleaned by manual intervention and backwashing: closing the third ball valve 15, opening the second ball valve 14, allowing the liquid in the liquid container 3 to be tested to enter the first liquid return branch 19 through the liquid output pipeline, allowing the liquid to enter the filter 3 from the first liquid return branch 19 for backwashing, and finally opening the blow-down valve 6 to discharge waste liquid from the blow-down port;
and S5, after the waste liquid is emptied, closing the blowdown valve 6 and the second ball valve 14, opening the third ball valve 15 to continue liquid circulation in the device, and during sampling, closing the outlet electromagnetic valve 22 and sampling the online analyzer from the sampling pipeline for analysis.
In summary, the present invention is only a preferred embodiment, and not intended to limit the scope of the invention, and all equivalent changes and modifications in the shape, structure, characteristics and spirit of the present invention described in the claims should be included in the scope of the present invention.
Claims (8)
1. A pretreatment device of a chemical process on-line analyzer is characterized by comprising a controller, a liquid container to be measured, a circulating pump, a filter, a liquid inlet pressure sensor and a liquid outlet pressure sensor, wherein the filter is provided with a liquid inlet, a liquid outlet, an overflow port and a sewage discharge port, a sewage discharge valve is arranged at the sewage discharge port, an overflow valve is arranged at the overflow port, the liquid inlet pressure sensor is arranged at the top of the filter, the liquid outlet pressure sensor is arranged at the liquid outlet of the filter, a main circulating pipeline is communicated with the liquid container to be measured, the circulating pump is arranged on the main circulating pipeline, a liquid output pipeline is communicated with the main circulating pipeline, a liquid input pipeline is communicated with the liquid inlet of the filter, the liquid that awaits measuring among the liquid container that will await measuring is imported to in the filter, the filter still through return liquid pipeline with the liquid container intercommunication that awaits measuring return liquid pipeline intercommunication have with the sampling pipeline of on-line analyzer intercommunication install first ball valve on the anterior segment of liquid output pipeline, install the second ball valve on its back end install the third ball valve on the liquid input pipeline, feed liquor pressure sensor and play liquid pressure sensor all with the controller communication is connected.
2. The pretreatment device of a chemical process on-line analyzer according to claim 1, wherein the starting end of the liquid return line is connected to the liquid outlet, the sampling line is installed at the starting end of the liquid return line, the sampling line is located behind the liquid outlet pressure sensor, a normally closed solenoid valve is installed at the front section of the liquid return line, a fourth ball valve is installed at the rear section of the liquid return line, and the tail end of the liquid output line is connected to the liquid return line through a three-way connection.
3. The pretreatment device of a chemical process on-line analyzer according to claim 1, it is characterized in that the initial end of the liquid return pipeline is arranged on the overflow port, the overflow valve is arranged on the front end of the liquid return pipeline, the pretreatment device also comprises a flow cell, a first liquid return branch is connected to the liquid outlet of the filter, the tail end of the first liquid return branch is communicated with the flow cell, the front section of the liquid return pipeline is also connected with a second liquid return branch through a three-way connecting piece, the tail end of the second liquid return branch is communicated with the flow cell, the tail end of the liquid output pipeline is connected to the first liquid return branch pipeline through a three-way connecting piece, an inlet electromagnetic valve is further installed on the first liquid return branch, an outlet electromagnetic valve is further installed on the second liquid return branch, and the sampling pipeline is installed on the second liquid return branch.
4. The pretreatment device of claim 3, wherein a liquid level meter is further installed in the flow cell, and the top of the flow cell is further provided with an overflow port for venting air.
5. The pre-processing apparatus of the on-line analyzer for chemical process as claimed in claim 4, wherein the level meter is a float level meter.
6. The pre-processing apparatus of the on-line analyzer for chemical process according to claim 4, wherein the liquid level meter is an ultrasonic liquid level meter.
7. A pretreatment method of an on-line analyzer for chemical process, which is carried out by using the pretreatment apparatus of an on-line analyzer for chemical process according to claim 2, comprising the steps of:
s1, before use, the first ball valve, the third ball valve and the overflow valve need to be opened, the second ball valve is closed, the filter is filled with liquid to be tested, when the liquid overflow at the top overflow port is observed, the overflow valve is closed, and when the filter is used daily, the overflow valve is in a normally closed state except for manual intervention maintenance;
s2, judging whether the main circulation pipeline normally runs or not through the pressure value of the liquid inlet pressure sensor, determining that the main circulation pipeline meets the starting condition and the requirement of the filtering driving force, and judging that the pressure difference between the liquid inlet pressure sensor and the liquid outlet pressure sensor is observed under the condition that the filtering driving force requirement is met; if the pressure difference is smaller than the preset value, the liquid to be detected filtered by the filter returns to the liquid container to be detected through the liquid return pipeline for continuous circulation; if the pressure difference is greater than or equal to the preset value, the side can not continue to circulate, the controller control device stops running and gives an alarm, the normally closed electromagnetic valve is opened, the pressure difference between the liquid inlet pressure sensor and the liquid outlet pressure sensor is confirmed again, and whether a filter element of the filter is blocked or not is judged;
s3, if the blockage occurs, manual back flushing is required: closing the third ball valve, opening the second ball valve and the first normally closed solenoid valve, allowing liquid in the liquid container to be detected to enter a liquid return pipeline through a liquid output pipeline, allowing the liquid to enter a filter from the liquid return pipeline for back washing, and finally opening a drain valve to discharge waste liquid from a drain port;
and S4, after the waste liquid is emptied, closing the blowdown valve and the second ball valve, opening the third ball valve to continue liquid circulation in the device, and during sampling, closing the normally closed electromagnetic valve and sampling the online analyzer from the sampling pipeline for analysis.
8. A pretreatment method of an on-line analyzer for chemical process, which is carried out by using the pretreatment apparatus of an on-line analyzer for chemical process according to claim 3, comprising the steps of:
s1, before use, the first ball valve, the third ball valve and the overflow valve need to be opened, the second ball valve is closed, the filter is filled with liquid to be tested, when the liquid overflow at the top overflow port is observed, the overflow valve is closed, and when the filter is used daily, the overflow valve is in a normally closed state except for manual intervention maintenance;
s2, judging whether the main circulation pipeline normally runs or not through the pressure value of the liquid inlet pressure sensor, determining that the main circulation pipeline meets the starting condition and the requirement of the filtering driving force, and judging that the pressure difference between the liquid inlet pressure sensor and the liquid outlet pressure sensor is observed under the condition that the filtering driving force requirement is met; if the pressure difference is smaller than the preset value, the liquid to be detected filtered by the filter returns to the liquid container to be detected through the liquid return pipeline for continuous circulation; if the pressure difference is greater than or equal to the preset value, the side can not continue to circulate, and the controller control device stops running and gives an alarm;
s3, keeping the inlet electromagnetic valve in a closed state, opening the outlet electromagnetic valve, draining liquid in the flow cell through gravity drainage, opening the inlet electromagnetic valve and the outlet electromagnetic valve after checking and confirming that the liquid in the flow cell is drained, and confirming the pressure difference between the liquid inlet pressure sensor and the liquid outlet pressure sensor so as to judge whether pressure reduction is successful;
s4, if the pressure reduction is unsuccessful, the filter element in the filter is blocked, and the filter needs to be cleaned by manual intervention and backwashing: closing the third ball valve, opening the second ball valve, allowing liquid in the liquid container to be detected to enter the first liquid return branch through the liquid output pipeline, allowing the liquid to enter the filter from the first liquid return branch for backwashing, and finally opening the drain valve to discharge waste liquid from the drain port;
and S5, after the waste liquid is emptied, closing the blowdown valve and the second ball valve, opening the third ball valve to continue liquid circulation in the device, closing the outlet electromagnetic valve during sampling, and sampling by the online analyzer from the sampling pipeline for analysis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011542326.9A CN112730009A (en) | 2020-12-22 | 2020-12-22 | Pretreatment device and pretreatment method for chemical process on-line analyzer |
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| CN202011542326.9A CN112730009A (en) | 2020-12-22 | 2020-12-22 | Pretreatment device and pretreatment method for chemical process on-line analyzer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114307324A (en) * | 2021-12-08 | 2022-04-12 | 广州崧安电子科技有限公司 | Solid-liquid separation processing apparatus |
| CN115282865A (en) * | 2022-08-03 | 2022-11-04 | 安徽灿实生物工程有限公司 | Online liquid machine of joining in marriage of buffer solution |
| CN117504397A (en) * | 2024-01-03 | 2024-02-06 | 技韬自动化科技(上海)股份有限公司 | Filter, pretreatment device and pretreatment method of online analyzer |
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2020
- 2020-12-22 CN CN202011542326.9A patent/CN112730009A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114307324A (en) * | 2021-12-08 | 2022-04-12 | 广州崧安电子科技有限公司 | Solid-liquid separation processing apparatus |
| CN115282865A (en) * | 2022-08-03 | 2022-11-04 | 安徽灿实生物工程有限公司 | Online liquid machine of joining in marriage of buffer solution |
| CN117504397A (en) * | 2024-01-03 | 2024-02-06 | 技韬自动化科技(上海)股份有限公司 | Filter, pretreatment device and pretreatment method of online analyzer |
| CN117504397B (en) * | 2024-01-03 | 2024-03-29 | 技韬自动化科技(上海)股份有限公司 | Filter, pretreatment device and pretreatment method of online analyzer |
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