CN113899588A - Sampling detection device for ethyl cellulose washing kettle and construction method - Google Patents
Sampling detection device for ethyl cellulose washing kettle and construction method Download PDFInfo
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- CN113899588A CN113899588A CN202111314704.2A CN202111314704A CN113899588A CN 113899588 A CN113899588 A CN 113899588A CN 202111314704 A CN202111314704 A CN 202111314704A CN 113899588 A CN113899588 A CN 113899588A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/42—Low-temperature sample treatment, e.g. cryofixation
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Abstract
The invention discloses a sampling detection device for an ethyl cellulose washing kettle and a construction method, and belongs to the technical field of design and manufacture of sampling detection equipment in chemical production. The sampling detection device for the ethyl cellulose washing kettle and the construction method are convenient to operate and relatively high in detection effect. The sampling detection device comprises a sampling cooling conveying system and a remote pH meter, wherein the remote pH meter is connected at the far end of the sampling cooling conveying system in series; in the sampling and detecting process, the liquid in the ethyl cellulose washing kettle is sampled, cooled and conveyed to a remote pH meter through the sampling and cooling conveying system to detect the pH value. The construction method comprises the steps of blowing the flow-through tanks of the sampling cooling conveying system and the remote pH meter before sampling to ensure the flow-through tanks to be smooth, and then conveying the liquid in the ethyl cellulose washing kettle to the remote pH meter through sampling, cooling and conveying of the sampling cooling conveying system to detect the pH value of the liquid.
Description
Technical Field
The invention relates to a sampling detection device, in particular to a sampling detection device for an ethyl cellulose washing kettle, and belongs to the technical field of design and manufacture of sampling detection equipment in chemical production. The invention also relates to a construction method for sampling and detecting by adopting the sampling and detecting device.
Background
The pH value in the washing kettle needs to be adjusted in the washing process of the ethyl cellulose, but the EC washing temperature is higher than 100 ℃, and a pH meter meeting the process condition is not available in the market at present. In the past, a washing solution is generally taken and tested by a pH test paper, the precision is not high, the operation is original and unsafe, and the method is better than the conventional automatic and less-humanized mode.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the sampling detection device for the ethyl cellulose washing kettle is convenient to operate and relatively high in detection effect. The invention also provides a construction method for sampling and detecting by adopting the sampling and detecting device.
The technical scheme adopted for solving the technical problems is as follows: a sampling detection device for an ethyl cellulose washing kettle comprises a sampling cooling conveying system and a remote pH meter, wherein the remote pH meter is connected at the far end of the sampling cooling conveying system in series; in the sampling and detecting process, the liquid in the ethyl cellulose washing kettle is sampled, cooled and conveyed to a remote pH meter through the sampling and cooling conveying system to detect the pH value.
Further, the remote pH meter comprises a pH meter body and a flow cell, wherein the pH meter body is connected with the flow cell along the radial direction, and the remote pH meter is connected with the far end of the sampling cooling conveying system in series through the flow cell.
The preferable mode of the scheme is that the sampling, cooling and conveying system comprises a valve, a cooling assembly and a conveying pipe system, the front end and the rear end of the cooling assembly are both connected with the valve in series through the conveying pipe system, and the flow cell of the remote pH meter is connected with the conveying pipe system at the output end of the cooling assembly in series.
Furthermore, the cooling assembly comprises an L-shaped long straight cooling pipe or an L-shaped cooling sleeve, a liquid inlet valve is connected to the input end of the long straight cooling pipe or the cooling sleeve in series, and the output end of the long straight cooling pipe or the cooling sleeve is connected with the input end of the flow cell.
The preferable mode of the above scheme is that the sampling cooling conveying system further comprises an inverted U-shaped pipe, the input end of the inverted U-shaped pipe is connected with the output end of the flow cell, and the output end of the inverted U-shaped pipe is connected with a liquid discharge valve in series through a conveying pipe system.
Furthermore, the sampling, cooling and conveying system further comprises a blowing and cleaning assembly, the output end of the blowing and cleaning assembly is communicated with the long straight cooling pipe or the cooling sleeve from the corner of the L-shaped cooling sleeve or the L-shaped long straight cooling pipe, and the input end of the blowing and cleaning assembly is connected with a gas valve in series.
The preferable mode of the scheme is that the liquid inlet valve and the liquid outlet valve are both ball valves or butterfly valves, and the liquid inlet ball valve, the liquid outlet butterfly valve and the gas valve are all pneumatic valves.
Further, the sampling detection device still include the DCS system, the control line of PH meter body, feed liquor ball valve, flowing back valve and gas valve all is connected with the DCS system, has still concatenated filter screen at the front end of feed liquor valve.
The construction method for sampling and detecting by adopting the sampling and detecting device comprises the following steps,
1) opening a liquid inlet valve and a gas valve to purge the long straight cooling pipe or the cooling sleeve and the filter screen, and then closing the liquid inlet valve;
2) opening a liquid discharge valve and a gas valve to blow and remove residual liquid in the flow cell, and then closing the gas valve;
3) opening a liquid inlet valve to enable the washing liquid to pass through a filtering screen for filtering, then entering a long straight cooling pipe or a cooling sleeve for cooling, and then carrying out pH test through a pH meter body;
4) and after the test is finished, the drain valve is closed firstly and then the liquid inlet valve is closed.
Further, the purging duration of the long straight cooling pipe or the cooling sleeve and the purging duration of the flow cell are both 1-5 min.
The invention has the beneficial effects that: according to the technical scheme, a set of sampling detection device comprising a sampling cooling conveying system and a remote pH meter is arranged, and the remote pH meter is connected to the far end of the sampling cooling conveying system in series; then, the construction method provided by the application is matched, the flow cell of the sampling cooling conveying system and the flow cell of the remote pH meter are firstly blown and swept before sampling, so that the flow cell is ensured to be smooth, then the liquid in the ethyl cellulose washing kettle is sampled, cooled and conveyed to the remote pH meter through the sampling cooling conveying system to detect the pH value of the liquid, and the conditions that the precision is not high, the operation is original and unsafe, and the situation that the pH test is carried out by using a pH test paper through taking a washing liquid in the prior art, and the situation that the lattice is not input is required to be automated and less man-made at present are changed. Adopt the technical scheme that this application provided, solved high temperature liquid and can't through the technical problem that pH value was surveyed to the pH meter, and through the pH value of pH meter survey liquid can effectively be guaranteed, reach convenient operation, detection effect higher purpose relatively.
Drawings
FIG. 1 is a schematic plan view of a sampling and detecting device for an ethyl cellulose washing tank according to the present invention.
Labeled as: the device comprises a sampling, cooling and conveying system 1, a remote pH meter 2, a pH meter body 3, a flow cell 4, a cooling component 5, a liquid inlet valve 6, an inverted U-shaped pipe 7, a liquid outlet valve 8, a purging and cleaning component 9, a gas valve 10 and a filter screen 11.
Detailed Description
As shown in FIG. 1, the invention provides a sampling detection device for an ethyl cellulose washing kettle, which is convenient to operate and has relatively high detection effect, and a construction method for sampling detection by adopting the sampling detection device. The sampling detection device comprises a sampling cooling conveying system 1 and a remote pH meter 2, wherein the remote pH meter 2 is connected at the far end of the sampling cooling conveying system 1 in series; in the sampling and detecting process, the liquid in the ethyl cellulose washing kettle is sampled, cooled and conveyed to a remote pH meter 2 through the sampling, cooling and conveying system 1 to detect the pH value. According to the technical scheme, a set of sampling detection device comprising a sampling cooling conveying system and a remote pH meter is arranged, and the remote pH meter is connected to the far end of the sampling cooling conveying system in series; then, the construction method provided by the application is matched, the flow cell of the sampling cooling conveying system and the flow cell of the remote pH meter are firstly blown and swept before sampling, so that the flow cell is ensured to be smooth, then the liquid in the ethyl cellulose washing kettle is sampled, cooled and conveyed to the remote pH meter through the sampling cooling conveying system to detect the pH value of the liquid, and the conditions that the precision is not high, the operation is original and unsafe, and the situation that the pH test is carried out by using a pH test paper through taking a washing liquid in the prior art, and the situation that the lattice is not input is required to be automated and less man-made at present are changed. Adopt the technical scheme that this application provided, solved high temperature liquid and can't through the technical problem that pH value was surveyed to the pH meter, and through the pH value of pH meter survey liquid can effectively be guaranteed, reach convenient operation, detection effect higher purpose relatively.
In the above embodiment, in order to improve the detection effect, and simultaneously, not to damage the remote pH meter due to the liquid temperature deviation, the remote pH meter 2 in the present application includes a pH meter body 3 and a flow cell 4, the pH meter body 3 is connected with the flow cell 4 along the radial direction, and the remote pH meter 2 is connected in series at the far end of the sampling cooling conveying system 1 through the flow cell 4. Correspondingly, in order to simplify this application sample cooling conveying system's structure improves the maneuverability of getting liquid simultaneously, this application sample cooling conveying system 1 include valve, cooling module 5 and delivery piping the valve has all been concatenated through delivery piping in cooling module's front end and rear end, and the flow-through cell 4 of teletransmission pH meter 2 concatenates on the delivery piping of cooling module output. At this time, the cooling assembly 5 may be an L-shaped long straight cooling pipe or an L-shaped cooling jacket, the liquid inlet valve 6 is connected in series to the input end of the long straight cooling pipe or the cooling jacket, and the output end of the long straight cooling pipe or the cooling jacket is connected to the input end of the flow cell 4. And in order to discharge the liquid after the detection for convenience, the sampling cooling conveying system 1 further comprises an inverted U-shaped pipe 7, the input end of the inverted U-shaped pipe 7 is connected with the output end of the flow cell 4, and a liquid discharge valve 8 is connected in series on the output end of the inverted U-shaped pipe 7 through a conveying pipe system.
Further, in order to improve the accuracy that detects, reduce the detection error because of getting liquid problem and appearing, the application sample cooling conveying system 1 still include purge cleaning assembly 9, purge cleaning assembly 9's output from the cooling jacket of L type or the long straight cooling tube's of L type corner with long straight cooling tube or cooling jacket intercommunication, the gas valve 10 has concatenated on purge cleaning assembly 9's input. At the moment, the liquid inlet valve 6 and the liquid outlet valve 8 are both ball valves or butterfly valves, and the liquid inlet ball valve 6, the liquid outlet butterfly valve 8 and the gas valve 10 are all pneumatic valves. Simultaneously, in order to improve the degree of automation of getting liquid, detection, the sample detection device still include the DCS system, the control line of PH meter body 3, feed liquor ball valve 6, flowing back valve 8 and gas valve 10 all with DCS headtotail, it has filter screen 11 still to concatenate at the front end of feed liquor valve 6. The DCS system described herein provides a modular control system with soft programs for the prior art providers based on the needs of the users.
Thus, when the sampling detection device is adopted to detect the pH value of the liquid in the ethyl cellulose washing kettle, the steps can be carried out,
1) opening a liquid inlet valve 6 and a gas valve 10 to purge the long straight cooling pipe or the cooling sleeve and the filter screen 11, and then closing the liquid inlet valve;
2) opening a liquid discharge valve 8 and a gas valve 10 to purge and remove residual liquid in the flow cell 4, and then closing the gas valve 10;
3) opening the liquid inlet valve 6 to filter the washing liquid through the filter screen 11, then cooling the washing liquid in the long straight cooling pipe or the cooling sleeve, and then testing the pH value through the pH meter body 3;
4) after the test is finished, the drain valve 8 is closed first, and then the liquid inlet valve is closed. At this time, in order to improve the purging effect, in the above embodiment, the purging time of the long straight cooling pipe or the cooling jacket and the purging time of the flow cell 4 are both 1 to 5 min.
In summary, the above technical solution of the present application further has the following advantages: the technical scheme of the application breaks the limitation of the use temperature of the pH meter, so that the pH meter can be used in an EC washing kettle beyond the use range of the pH, and the pH use requirement of the special process is met. Meanwhile, pH remote transmission, valve remote control and operation steps are integrated, so that the automation of EC production is facilitated, the operation is simplified, and the labor intensity is reduced. The gas recoil mode is adopted, so that the speed and the accuracy of the test are improved.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The invention aims to solve the technical problem of providing an automatic sampling device and an operation method of an intermittent pH meter outside a normal-pressure or low-pressure chemical reaction kettle.
In order to solve the technical problem, the technical scheme adopted by the invention is that the device comprises: comprises a filter screen, a liquid inlet valve, a long straight pipe, a gas valve, a remote pH meter, a U-shaped bend, a liquid discharge valve, a connecting pipeline and a pipe fitting. The liquid circulation sequence is filter screen, liquid inlet valve, long straight pipe, remote transmission pH meter, U-shaped bend and drain valve, and the gas valve is located behind the bend at the bottom of the long straight pipe.
In order to solve the technical problem, the technical scheme adopted by the invention is that the device comprises the following operation steps: 1) opening the liquid inlet valve and the gas valve for a certain time and then closing the valves; 2) opening the drain valve and the gas valve for a certain time and then closing the gas valve; 3) opening a liquid inlet valve to filter washing liquid through a filter screen, and carrying out a pH test through a remote pH meter after a long straight pipe is cooled; 4) and after the test is finished, closing the liquid discharge valve and then closing the liquid inlet valve.
The filter screen is 10-30 meshes, and aims to block granular EC materials in the washing kettle and prevent the materials from entering the device to block a pipeline, and on the other hand, the materials are left in the washing kettle and only allow washing water to pass through, and the washing water after testing can be directly discharged to a waste water system. The too big aperture plays the effect that can not block the material, and too little aperture circulation ability is not enough, influences test speed.
The liquid inlet valve is a valve with a large circulation caliber for a ball valve or a butterfly valve, is beneficial to the circulation of a small amount of EC materials, is arranged at the top of the long straight pipe, and has the function of cutting off the washing water.
The length of the long straight pipe is larger than 2m, the diameter range is DN 10-DN 25, the length increase and the diameter decrease are both used for improving the cooling effect, the PH working environment is in the normal temperature range, the diameter of the pipeline is too low, the circulation capacity is weak, and the testing speed is slow. It may be replaced by a cooled jacket.
After the gas valve is installed on the elbow at the bottom of the long straight pipe, the medium of the gas valve is nitrogen or air, and the purpose of the gas valve is as follows: on one hand, the filtering screen is swept, and EC materials attached to the screen are swept completely, so that the circulation of washing water is facilitated; on the other hand say that the water in the PH meter flow-through cell blows off totally, reduces the influence of remaining washing water in the PH meter flow-through cell to the result, improves the speed and the accuracy of test.
The drain valve is a ball valve or a butterfly valve, the size of which is consistent with the diameter of the PH meter pipeline, and the drain valve is arranged behind the U-shaped bend.
The duration of opening the valve in the step 1) is 1-5 min.
And 2) opening the valve for 1-5 min.
The liquid inlet valve, the gas valve, the liquid discharge valve and the PH meter are all pneumatic valves, the PH meter is a remote transmission PH meter, and the operation steps are integrated together to enter the DCS system, so that automatic sampling test is realized.
The U-shaped pipe is used for ensuring that the PH probe is always completely immersed in liquid, and prolonging the service life of the PH probe.
Example one
As shown in fig. 1, the technical solution adopted by the present invention is that the apparatus comprises: comprises a filter screen, a liquid inlet valve, a long straight pipe, a gas valve, a remote pH meter, a U-shaped bend, a liquid discharge valve, a connecting pipeline and a pipe fitting. The liquid circulation sequence is filter screen, liquid inlet valve, long straight pipe, remote transmission pH meter, U-shaped bend and drain valve, and the gas valve is located behind the bend at the bottom of the long straight pipe.
The operation steps of the device shown in FIG. 1 are as follows: 1) after the liquid inlet valve and the gas valve are opened for a certain time, the valves are closed to ensure that the long straight pipe and the filter screen are cleaned by blowing, so that smooth sampling is facilitated; 2) opening the drain valve and the gas valve for a certain time and then closing the gas valve; residual liquid in a PH meter flow cell is swept away, so that the test is convenient to carry out quickly and accurately 3) a washing liquid of a liquid inlet valve is opened to be filtered by a filter screen, and the long straight pipe is cooled and then subjected to the PH test by a remote pH meter; 4) and after the test is finished, closing the liquid discharge valve and then closing the liquid inlet valve.
Claims (10)
1. The utility model provides a sample detection device for ethyl cellulose washing kettle which characterized in that: the sampling detection device comprises a sampling cooling conveying system (1) and a remote pH meter (2), wherein the remote pH meter (2) is connected to the far end of the sampling cooling conveying system (1) in series; in the sampling and detecting process, liquid in the ethyl cellulose washing kettle is sampled, cooled and conveyed to a remote pH meter (2) through the sampling, cooling and conveying system (1) to detect the pH value of the liquid.
2. The sampling test device for the ethylcellulose washing kettle according to claim 1, characterized in that: the remote pH meter (2) comprises a pH meter body (3) and a flow cell (4), wherein the pH meter body (3) is connected with the flow cell (4) along the radial direction, and the remote pH meter (2) is connected with the far end of the sampling, cooling and conveying system (1) in series through the flow cell (4).
3. The sampling test device for the ethylcellulose washing kettle according to claim 1 or 2, characterized in that: the sampling, cooling and conveying system (1) comprises valves, a cooling assembly (5) and a conveying pipe system, wherein the front end and the rear end of the cooling assembly are connected with the valves in series through the conveying pipe system, and a flow cell (4) of the remote pH meter (2) is connected with the conveying pipe system at the output end of the cooling assembly in series.
4. The sampling test device for the ethylcellulose washing kettle according to claim 3, characterized in that: the cooling assembly (5) comprises a long straight cooling pipe in an L shape or a cooling sleeve in an L shape, a liquid inlet valve (6) is connected with the input end of the long straight cooling pipe or the input end of the cooling sleeve in series, and the output end of the long straight cooling pipe or the output end of the cooling sleeve is connected with the input end of the flow cell (4).
5. The sampling test device for the ethylcellulose washing kettle according to claim 4, characterized in that: the sampling, cooling and conveying system (1) further comprises an inverted U-shaped pipe (7), the input end of the inverted U-shaped pipe (7) is connected with the output end of the flow cell (4), and a liquid discharge valve (8) is connected in series on the output end of the inverted U-shaped pipe (7) through a conveying pipe system.
6. The sampling test device for the ethylcellulose washing kettle according to claim 5, characterized in that: the sampling, cooling and conveying system (1) further comprises a blowing and cleaning assembly (9), the output end of the blowing and cleaning assembly (9) is communicated with the long straight cooling pipe or the cooling sleeve from the corner of the L-shaped cooling sleeve or the L-shaped long straight cooling pipe, and a gas valve (10) is connected to the input end of the blowing and cleaning assembly (9) in series.
7. The sampling test device for the ethylcellulose washing kettle according to claim 6, characterized in that: the liquid inlet valve (6) and the liquid discharge valve (8) are both ball valves or butterfly valves, and the liquid inlet ball valve (6), the liquid discharge butterfly valve (8) and the gas valve (10) are all pneumatic valves.
8. The sampling test device for the ethylcellulose washing kettle according to claim 7, characterized in that: the sampling detection device further comprises a DCS system, control lines of the PH meter body (3), the liquid inlet ball valve (6), the liquid discharge valve (8) and the gas valve (10) are all connected with the DCS system, and a filter screen (11) is connected to the front end of the liquid inlet valve (6) in series.
9. The construction method for sampling and detecting by using the sampling detection device of claim 8, wherein: the construction method comprises the following steps of,
1) opening a liquid inlet valve (6) and a gas valve (10) to purge a long straight cooling pipe or a cooling sleeve and a filtering screen (11), and then closing the liquid inlet valve;
2) opening a liquid discharge valve (8) and a gas valve (10) to purge and remove residual liquid in the flow cell (4), and then closing the gas valve (10);
3) opening a liquid inlet valve (6) to filter the washing liquid through a filter screen (11), then entering a long straight cooling pipe or a cooling sleeve for cooling, and then carrying out pH test through a pH meter body (3);
4) after the test is finished, the drain valve (8) is closed first, and then the liquid inlet valve is closed.
10. The construction method according to claim 9, wherein: the purging duration of the long straight cooling pipe or the cooling sleeve and the purging duration of the flow cell (4) are both 1-5 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111314704.2A CN113899588A (en) | 2021-11-08 | 2021-11-08 | Sampling detection device for ethyl cellulose washing kettle and construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111314704.2A CN113899588A (en) | 2021-11-08 | 2021-11-08 | Sampling detection device for ethyl cellulose washing kettle and construction method |
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| CN211487615U (en) * | 2019-12-05 | 2020-09-15 | 浙江华海天诚药业有限公司 | Online pH value detection system |
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2021
- 2021-11-08 CN CN202111314704.2A patent/CN113899588A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102841119A (en) * | 2012-09-29 | 2012-12-26 | 安徽金星钛白（集团）有限公司 | On-line pH (Potential of Hydrogen) value sampling measurement device for slurry material |
| CN103163184A (en) * | 2013-03-25 | 2013-06-19 | 浙江恒达仪器仪表有限公司 | Indoor analysis meter for precipitation sample |
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