CN112666045A - System device and method for online continuous measurement of pH value and density - Google Patents
System device and method for online continuous measurement of pH value and density Download PDFInfo
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- CN112666045A CN112666045A CN202011509769.8A CN202011509769A CN112666045A CN 112666045 A CN112666045 A CN 112666045A CN 202011509769 A CN202011509769 A CN 202011509769A CN 112666045 A CN112666045 A CN 112666045A
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Abstract
The invention relates to a system device and a method for online continuous measurement of pH value and density, which can be used for online continuous measurement of pH value and density of process media and can be widely matched with power plant desulfurization and denitrification and other related process systems. The system device mainly comprises a process pipeline arranged on the side wall of the reaction kettle, a measuring device, a pH value measuring instrument and two transmitter instruments for measuring liquid level, wherein the process pipeline is used for guiding a measuring medium to pass through by configuring corresponding auxiliary process equipment, the measuring medium enters the measuring device after being sampled by a valve and a booster pump, the pH value is directly measured by the pH value measuring instrument, and the density value is converted and calculated by measuring the height difference of the liquid level. Compare other measurement system and adopt imported high value tuning fork densimeter to compare, system's device after improving through above-mentioned scheme has economic reliable, and the medium densimeter measures advantages such as accurate and the online maintenance of being convenient for is washed.
Description
Technical Field
The invention belongs to the field of instrument control for measuring pH value and density of a high-concentration process medium, and particularly relates to a system device and a method for continuously measuring the pH value and the density of the process medium in an on-line manner.
Background
In the current power plant and chemical industry, the pH value and density value of a medium are used as important parameters of a production process, and the accuracy and stability of the numerical value directly influence the operating efficiency and economic performance of the production process. In the present context, the widely used measuring method mainly adopts an imported tuning fork type densimeter or a mass flowmeter, the densimeter has high cost, and the tuning fork type densimeter has large value fluctuation when the flow rate of a medium and the vibration of a pipeline are high. And some domestic differential densimeters have simple structure, unreasonable design, and are easy to cause sediment to block a measuring port when being particularly installed in a high-concentration medium tank, so that the measured value is unstable and distorted, and meanwhile, the online maintenance can not be realized. Under the condition, the invention provides an improved pH value and density measuring system device with on-line continuous measuring function and a measuring method. The method is accurate and stable in on-site feedback measurement, low in manufacturing cost, economical and reliable.
Disclosure of Invention
The invention aims to solve the defects in the existing pH value and density value measuring technology and reduce the manufacturing cost, and provides a system device and a method for online continuously measuring the pH value and the density.
The scheme of the invention is as follows:
the invention provides a system device for online continuous measurement of pH value and density, which comprises a sampling device, an inlet pipeline, an outlet pipeline, an external discharge pipeline and a flushing pipeline, wherein the sampling device is connected with the inlet pipeline;
one end of the inlet pipeline is connected with the reaction kettle, and the other end of the inlet pipeline is connected with the bottom of the sampling device; the inlet pipeline is sequentially provided with a filter screen, a stop valve and a booster pump;
one end of the outlet pipeline is connected with the reaction kettle, and the other end of the outlet pipeline is connected with the top of the sampling device;
the outer discharge pipeline and the flushing pipeline are both connected with the inlet pipeline, wherein the outer discharge pipeline is connected with a pipe section between the stop valve and the booster pump on the inlet pipeline; the flushing pipeline is connected with a pipe section between the booster pump and the sampling device on the inlet pipeline; the sampling device comprises a sampling device body, and an acid-base meter is arranged on the sampling device body; the side wall of the sampling device body is also provided with at least two liquid level transmitters at different heights along the axis direction; the bottom and the top of the sampling device body are both provided with pore plate flanges with throttling devices, the top pore plate flange is connected with an outlet pipeline, and the bottom pore plate flange is connected with an inlet pipeline.
The invention also provides a method for continuously measuring the pH value and the density on line by the system device, which comprises the following steps:
closing the outer discharge pipeline and the flushing pipeline, and opening the inlet pipeline; filtering sundries with larger volume in the reaction kettle by using a filter screen, and enabling a medium to be detected to enter an inlet pipeline; under the action of the booster pump, the fluid enters the sampling device;
the orifice plate flange with the throttling device at the bottom limits the fluctuation of the flow velocity of liquid flowing into the sampling device, and an acid-base meter on the sampling device continuously measures the pH value; the liquid level transmitter with a higher installation position measures a pressure value P1, the liquid level transmitter with a lower installation position measures a pressure value P2, and the pressure value is converted into rho g (H1-H2)/(P1-P2) through the formula (P1-P2) ═ rho g (H1-H2); g, the gravity acceleration H1 and H2 are respectively the installation heights of the two liquid level transmitters;
in the continuous testing process, the medium passes through the sampling device and then returns to the reaction kettle along the outlet pipeline again to form a loop, so that online continuous measurement is realized;
during maintenance, the stop valve of the inlet pipeline is closed, and when the residual medium in the loop needs to be discharged during maintenance, the discharge pipeline is opened to discharge the measuring medium to the trench; when the maintenance is finished and the impurities in the pipeline need to be washed clean, the washing pipeline is opened to wash the pipeline.
Compared with the prior art, the on-line continuous measuring system device with pH value and density has the advantages that the system configuration is simple, the installation is convenient, and the defects that the value fluctuation of densimeters of other densimeter measuring devices is large, the online maintenance cannot be realized and the like are overcome through the two liquid level transmitters which are correspondingly installed up and down. Meanwhile, the invention also provides an external discharge pipeline and a flushing pipeline for the testing device, is provided with an acid-base meter, and has the functions of convenient flushing and needing to measure the pH value. In order to reduce the interference between pH value and density measurement, the middle section of the sampling device is set to be a cylindrical barrel with certain radial dimension, and a pH value meter and a liquid level transmitter are arranged on two corresponding sides.
Through the implementation of the scheme, the invention has the advantages of accurate measuring instrument, low cost, stable and reliable performance, convenient installation and on-line maintenance, and the like.
Drawings
FIG. 1 is a system diagram of an online system for continuously measuring pH and density according to the present invention.
FIG. 2 is a schematic diagram of the system structure of the sampling device in the system according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, in the present invention, unless otherwise explicitly specified or limited, the term "connected" and the like are to be interpreted broadly, and for example, "connected" may be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection, physical connection or wireless communication connection; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention is further described with reference to the following figures and specific examples.
As shown in fig. 1, in an embodiment of the present invention, the system device for online continuous measurement of ph and density includes a sampling device 8, an inlet pipeline, an outlet pipeline, an external discharge pipeline and a flushing pipeline;
one end of the inlet pipeline is connected with the reaction kettle, and the other end of the inlet pipeline is connected with the bottom of the sampling device 8; the inlet pipeline is sequentially provided with a filter screen 2, a stop valve 3 and a booster pump 5;
one end of the outlet pipeline is connected with the reaction kettle, and the other end of the outlet pipeline is connected with the top of the sampling device 8;
the outer discharge pipeline and the flushing pipeline are both connected with the inlet pipeline, wherein the outer discharge pipeline is connected with a pipe section between the stop valve 3 and the booster pump 5 on the inlet pipeline; the flushing pipeline is connected with a pipe section between the booster pump 5 and the sampling device on the inlet pipeline;
the sampling device 8 comprises a sampling device body, and an acid-base meter is arranged on the sampling device body; the side wall of the sampling device body is also provided with at least two liquid level transmitters at different heights along the axis direction; the bottom and the top of the sampling device body are both provided with pore plate flanges with throttling devices, the top pore plate flange is connected with an outlet pipeline, and the bottom pore plate flange is connected with an inlet pipeline.
In a preferred embodiment of the present invention, a sampling interface flange 14 of a ph meter is arranged on one side of the sampling device body, and is used for installing the ph meter; and the other side corresponding to the sampling interface flange 14 of the pH value meter is provided with two transmitter interface flanges with stop valves, and the transmitter interface flanges are respectively used for installing two liquid level transmitters. And the sampling interface flange 14 of the pH meter and the transmitter interface flange are both arranged on the sampling device at an oblique angle of 45 degrees.
As shown in fig. 2, in a preferred embodiment of the present invention, the middle section of the sampling device body is cylindrical, and the upper end and the lower end of the sampling device body are both truncated cone-shaped; the radial size of the middle section is larger than the sizes of the upper end and the lower end; the acid-base meter and the liquid level transmitter are both arranged at the middle section. The total size of the sampling device is 800 mm. And an orifice plate flange 7 with a throttling device is arranged at the inlet of the sampling device, the size of the orifice plate flange is DN40 flange interface, and the orifice plate flange is used for limiting the fluctuation of the flow rate of the liquid flowing into the sampling device. Therefore, the flow rate of liquid in the sampling device is stabilized, the sizes of the two ends of the sampling device are phi 45mm, the size of the middle of the sampling device is phi 159mm, the wall thickness of the sampling device is 5mm, and the sampling device is made of 316L stainless steel to ensure corrosion resistance and wear resistance. Sampling device one side is equipped with pH valve appearance interface flange, and two liquid level transmitter instrument interface flanges are equipped with to the opposite side, and flange takeover length is L100 mm, and flange 45 oblique angles are installed in sampling device, and its effect prevents partial silt deposit in the flange mouth.
The pH meter in the embodiment can be selected as an intelligent online pH meter according to the requirements of users, the glass electrode is installed on the flange interface 14 through flange connection, and signals are transmitted to a secondary instrument of the pH analyzer through the pH glass electrode through a signal wire. The user can design the analyzer and configure the field box according to specific needs, and the pH value is displayed on the analyzer while the transmitter current signal is transmitted to the control system. The two transmitter meters for measuring the liquid level are obtained by converting a formula (P1-P2) which is rho g (H1-H2) through measuring the liquid level pressure difference, wherein P1 is the measured value of the liquid level transmitter (12), P2 is the measured value of the liquid level transmitter (10), g is a coefficient 9.8, and (H1-H2) is the fixed value (0.5m) of the height difference of the two transmitters. And obtaining the density value rho of the process medium which is 4.9/(P1-P2) after conversion.
In a preferred embodiment of the present invention, the inlet pipeline extends into the reaction kettle, and the filter screen 2 is arranged at the end of the inlet pipeline extending into the reaction kettle. And an outer discharge valve 4 and a flushing valve 6 are respectively arranged on the outer discharge pipeline and the flushing pipeline.
The invention relates to a method for continuously measuring pH value and density on line by using a system device, which comprises the following steps:
closing the outer discharge pipeline and the flushing pipeline, and opening the inlet pipeline; the filter screen 2 filters sundries with larger volume in the reaction kettle, and the medium to be measured enters an inlet pipeline; under the action of the booster pump, the fluid enters the sampling device 8;
the orifice plate flange with the throttling device at the bottom limits the fluctuation of the flow velocity of liquid flowing into the sampling device, and an acid-base meter on the sampling device continuously measures the pH value; the liquid level transmitter with a higher installation position measures a pressure value P1, the liquid level transmitter with a lower installation position measures a pressure value P2, and the pressure value is converted into rho g (H1-H2)/(P1-P2) through the formula (P1-P2) ═ rho g (H1-H2); g, the gravity acceleration H1 and H2 are respectively the installation heights of the two liquid level transmitters;
in the continuous testing process, the medium passes through the sampling device and then returns to the reaction kettle 1 along the outlet pipeline again to form a loop, so that the online continuous measurement is realized;
during maintenance, the stop valve of the inlet pipeline is closed, and when the residual medium in the loop needs to be discharged during maintenance, the discharge pipeline is opened to discharge the measuring medium to the trench; when the maintenance is finished and the impurities in the pipeline need to be washed clean, the washing pipeline is opened to wash the pipeline.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A system device and its method for online continuous measurement of pH value and density, characterized by that to include the sampling device (8), inlet pipeline, outlet line, discharge pipeline and flushing line;
one end of the inlet pipeline is connected with the reaction kettle, and the other end of the inlet pipeline is connected with the bottom of the sampling device (8); the inlet pipeline is sequentially provided with a filter screen (2), a stop valve (3) and a booster pump (5);
one end of the outlet pipeline is connected with the reaction kettle, and the other end of the outlet pipeline is connected with the top of the sampling device (8);
the outer discharge pipeline and the flushing pipeline are both connected with the inlet pipeline, wherein the outer discharge pipeline is connected with a pipe section between the stop valve (3) and the booster pump (5) on the inlet pipeline; the flushing pipeline is connected with a pipe section between the booster pump (5) and the sampling device on the inlet pipeline;
the sampling device (8) comprises a sampling device body, and an acid-base meter is arranged on the sampling device body; the side wall of the sampling device body is also provided with at least two liquid level transmitters at different heights along the axis direction; the bottom and the top of the sampling device body are both provided with pore plate flanges with throttling devices, the top pore plate flange is connected with an outlet pipeline, and the bottom pore plate flange is connected with an inlet pipeline.
2. The system device for on-line continuous measurement of pH value and density as claimed in claim 1, wherein one side of the sampling device body is provided with a pH meter sampling interface flange (14) for installing a pH meter; and the other side corresponding to the sampling interface flange (14) of the pH value meter is provided with two transmitter interface flanges with stop valves, and the transmitter interface flanges are respectively used for installing two liquid level transmitters.
3. The system device for on-line continuous measurement of pH value and density according to claim 1 or 2, wherein the middle section of the sampling device body is cylindrical and has a truncated cone shape at both the upper and lower ends; the radial size of the middle section is larger than the sizes of the upper end and the lower end; the acid-base meter and the liquid level transmitter are both arranged at the middle section.
4. The system for on-line continuous measurement of pH and density as claimed in claim 3, wherein the pH meter sampling interface flange (14) and the transmitter interface flange are both mounted on the sampling device at 45 ° bevel angle.
5. The system device for online continuous measurement of pH and density according to claim 1, wherein the height difference between the two level transmitters is 0.5 m.
6. The system device for online continuous measurement of pH value and density according to claim 1, wherein the inlet pipeline extends into the reaction kettle, and the filter screen (2) is arranged at the end of the inlet pipeline extending into the reaction kettle.
7. The system device for online continuous measurement of pH value and density according to claim 1, wherein the discharge pipeline and the flushing pipeline are respectively provided with a discharge valve (4) and a flushing valve (6).
8. The method for on-line continuous measurement of pH and density according to the system device of claim 1, comprising the steps of:
closing the outer discharge pipeline and the flushing pipeline, and opening the inlet pipeline; the filter screen (2) filters sundries with larger volume in the reaction kettle, and the medium to be measured enters the inlet pipeline; under the action of the booster pump, the fluid enters the sampling device (8);
the orifice plate flange with the throttling device at the bottom limits the fluctuation of the flow velocity of liquid flowing into the sampling device, and an acid-base meter on the sampling device continuously measures the pH value; the liquid level transmitter with a higher installation position measures a pressure value P1, the liquid level transmitter with a lower installation position measures a pressure value P2, and the pressure value is converted into rho g (H1-H2)/(P1-P2) through the formula (P1-P2) ═ rho g (H1-H2); g, the gravity acceleration H1 and H2 are respectively the installation heights of the two liquid level transmitters;
in the continuous testing process, the medium passes through the sampling device and then returns to the reaction kettle (1) along the outlet pipeline again to form a loop, so that online continuous measurement is realized;
during maintenance, the stop valve of the inlet pipeline is closed, and when the residual medium in the loop needs to be discharged during maintenance, the discharge pipeline is opened to discharge the measuring medium to the trench; when the maintenance is finished and the impurities in the pipeline need to be washed clean, the washing pipeline is opened to wash the pipeline.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011509769.8A CN112666045A (en) | 2020-12-18 | 2020-12-18 | System device and method for online continuous measurement of pH value and density |
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| CN202011509769.8A CN112666045A (en) | 2020-12-18 | 2020-12-18 | System device and method for online continuous measurement of pH value and density |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115138088A (en) * | 2022-05-19 | 2022-10-04 | 云南铜业股份有限公司西南铜业分公司 | Specific gravity measuring mechanism and multi-effect evaporation automatic liquid discharging device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207991987U (en) * | 2018-01-08 | 2018-10-19 | 华润电力（宜昌）有限公司 | Serosity density measurement system |
| CN208254996U (en) * | 2018-06-21 | 2018-12-18 | 国电环境保护研究院有限公司 | A kind of flue gas wet flue gas desulfurization gypsum slurries are in line density and pH value combined measurement device |
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- 2020-12-18 CN CN202011509769.8A patent/CN112666045A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207991987U (en) * | 2018-01-08 | 2018-10-19 | 华润电力（宜昌）有限公司 | Serosity density measurement system |
| CN208254996U (en) * | 2018-06-21 | 2018-12-18 | 国电环境保护研究院有限公司 | A kind of flue gas wet flue gas desulfurization gypsum slurries are in line density and pH value combined measurement device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115138088A (en) * | 2022-05-19 | 2022-10-04 | 云南铜业股份有限公司西南铜业分公司 | Specific gravity measuring mechanism and multi-effect evaporation automatic liquid discharging device |
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