CN115575459B - Miniaturized modularized water quality on-line monitoring system - Google Patents
Miniaturized modularized water quality on-line monitoring system Download PDFInfo
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- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The application discloses miniaturized modularization water quality on-line monitoring system relates to water chemistry on-line monitoring technical field. The system comprises: the automatic sampling unit comprises a sampling main branch circuit, wherein the sampling main branch circuit comprises a pressure regulating module, a temperature regulating module and a flow regulating module; the on-line measuring unit comprises a plurality of measuring branch modules, the input end of each measuring branch module is connected with the output end of the sampling main branch, and the output end is connected with the waste liquid collecting pipe; each measuring branch module comprises at least one on-line chemical instrument, an automatic control unit, a data acquisition module, a power supply and distribution module and a display control module, wherein the automatic control unit is used for measuring and transmitting process parameters, supplying power and controlling interlocking of the automatic sampling unit and the on-line measuring unit. The method has the advantages of simple process flow, high system integration level, small equipment size, low space occupation level, high automation degree and convenient operation, and can simultaneously realize the online continuous stable measurement of the water chemistry index.
Description
Technical Field
The application relates to the technical field of online monitoring of water chemistry, in particular to a miniaturized modularized water quality online monitoring system for nuclear reactor coolant water quality.
Background
Primary loop water chemistry control and monitoring is an important task in nuclear power plant operation management, related to safe, stable and economical operation of the entire plant. The advantages and disadvantages of the control of the water chemistry conditions are related to fuel burn-up, the irradiation level inside and outside the reactor, and have important effects on the fuel cladding and the pressure boundary integrity of a loop, the operation reliability of key equipment, the safety of a reactor system and the like. As the judgment basis of the water chemistry control, the water chemistry monitoring is important, and the sampling analysis of a loop is realized through a nuclear sampling monitoring system.
The nuclear sampling monitoring system is mainly divided into an online sampling monitoring system and a post-accident sampling system, and the online sampling monitoring system is mainly used for performing daily sampling analysis and monitoring on primary loop water quality of a nuclear reactor during normal operation of a nuclear power plant. Along with the demand of the system for monitoring the water quality of the nuclear reactor for meeting the development demands of miniaturization and unmanned, the space occupation level, the system complexity and the installation and maintenance convenience of the system for monitoring the water quality on line directly determine whether the technology can be continuously applied. The prior art has the problems of large occupied space, complicated system flow, long construction period and the like, and the application of the prior art is restricted.
Considering the specificity of water quality in the application environment of an online monitoring system, the difficulties faced by the research of the online monitoring system of water chemistry are mainly represented in the following aspects:
1) The rationality and effectiveness of the unit module hierarchy. The modularization needs to adopt principle products of decomposition and combination to carry out functional analysis and decomposition, and a series of general module systems with relatively independent functions are divided and formed. The rationality and availability of the chemical monitoring unit module hierarchy directly affects the functionality and performance of the system.
2) The integration level of each level of module is effective. In the water quality monitoring system, chemical monitoring meters are universal mature products, the external dimensions of the meters are shaped and are difficult to change, and the existing online chemical meters are distributed by adopting independent flow cells; the sample preparation unit is the most effective part with the optimized overall installation size of the water quality on-line monitoring system device, and comprises a pipeline system and an instrument flow pool, and the modular design is adopted to make the modularization give full play to the advantages of standardization and generalization, so that the system flow is effectively simplified, and the key of improving the integration level of the modules and reducing the space occupation level of the system is provided.
3) Applicability of the microminiature device and the process measurement instrument. The applicability and effectiveness of microminiature devices (electrically operated valves, process measurement instruments) in water chemistry monitoring systems are also an important part in determining the overall integration level of the module.
Disclosure of Invention
In order to solve the problems existing in the prior art, in a first aspect, the present application provides a miniaturized modularized water quality online monitoring system, including:
the automatic sampling unit comprises a sampling main branch circuit, wherein the sampling main branch circuit comprises a pressure regulating module, a temperature regulating module and a flow regulating module; the automatic sampling unit is used for adjusting parameters of water quality to be detected entering the sampling main branch to obtain a sample to be detected;
the on-line measuring unit comprises a plurality of measuring branch modules, the input end of each measuring branch module is connected with the output end of the sampling main branch, and the output end is connected with the waste liquid collecting pipe; each measuring branch module comprises at least one on-line chemical instrument, wherein the on-line chemical instrument comprises a conductivity meter, a dissolved hydrogen analyzer, a dissolved oxygen analyzer, a boron meter or a double-channel ion chromatograph; the online measurement unit is used for measuring the water quality parameters of the sample to be measured;
the automatic control unit comprises a data acquisition module, a power supply and distribution module and a display control module and is used for measuring and transmitting process parameters, supplying power and controlling interlocking of the automatic sampling unit and the online measurement unit.
In one embodiment, the automatic sampling unit further comprises a sampling bottle limb module disposed between the sampling main limb and the waste collection tube;
the sampling bottle branch module comprises a sampling bottle and an isolation valve assembly, and the sampling bottle is detachably connected into the sampling bottle branch module through a quick connector with a valve;
when sampling is needed, the isolation valve component is opened, so that the sample to be tested enters the sampling bottle from the bottom and flows out from the top.
In one embodiment, the pressure regulation module comprises:
the filter is used for filtering the water quality to be detected entering the sampling main branch;
the pressure reducing valve is used for adjusting the pressure of the water to be detected entering the sampling main branch to a preset target pressure;
the pressure transmitter is used for measuring the pressure of the water quality to be detected entering the sampling main branch and transmitting the pressure to the pressure reducing valve and the automatic control unit in real time;
and a safety valve for providing an overpressure protection function.
In one embodiment, the temperature adjustment module comprises:
the cooler is used for cooling the water quality to be detected entering the sampling main branch;
and the temperature sensor is used for measuring the temperature of the water quality to be detected entering the sampling main branch and transmitting the temperature to the cooler and the automatic control unit in real time so that the cooler can automatically adjust the flow of cooling water according to the temperature.
In one embodiment, the flow regulating module comprises:
the flow regulating valve is used for regulating the flow of the water quality to be detected entering the sampling main branch;
and the flowmeter is used for measuring the flow of the water quality to be detected entering the sampling main branch and transmitting the flow to the flow regulating valve and the automatic control unit in real time.
In an embodiment, the plurality of measurement leg modules includes:
the conductivity, dissolved hydrogen and dissolved oxygen measuring module is used for measuring the conductivity, the concentration of the dissolved hydrogen and the concentration of the dissolved oxygen of the sample to be measured in real time;
the conductivity, dissolved hydrogen and dissolved oxygen data processing module is used for receiving and processing the conductivity, the dissolved hydrogen concentration and the dissolved oxygen concentration of the sample to be measured by the conductivity, dissolved hydrogen and dissolved oxygen measuring module;
the boron measuring and data processing module is used for measuring and processing the boron concentration in the sample to be measured;
and the ion measurement and data processing module is used for measuring and processing the concentration of anions and cations in the sample to be measured.
In an embodiment, the pressure adjusting module, the temperature adjusting module, the flow adjusting module, the sampling bottle branch module, the measuring branch modules, the data acquisition module, the power supply and distribution module and the display control module are installed on the same substrate.
In one embodiment, the substrate comprises a plurality of unit grids with the same specification, and each unit grid is provided with a groove and a threaded hole so as to fix a module mounted on the unit grid.
In one embodiment, each module has the same runner interface location and interface parameters to facilitate the assembly and installation of each module on the substrate.
In one embodiment, a gasket seal is used to isolate the modules from each other.
The miniaturized modularized water quality online monitoring system has the advantages of simple process flow, high system integration level, small equipment size, low space occupation level, high automation degree and convenient operation, and can simultaneously realize and meet the use requirements of online chemical instruments such as a conductivity meter, a dissolved hydrogen analyzer, a dissolved oxygen analyzer, a double-channel ion chromatograph, a boron concentration analyzer and the like, and the online continuous stable measurement of the water chemical indexes such as the conductivity, the dissolved hydrogen, the dissolved oxygen, the anion, the cation concentration, the boron concentration and the like.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the drawings:
FIG. 1 is a schematic diagram of a miniaturized modular water quality on-line monitoring system provided herein.
Fig. 2 is a schematic structural diagram of a pressure adjusting module provided in the present application.
Fig. 3 is a schematic structural diagram of a temperature adjustment module provided in the present application.
Fig. 4 is a schematic structural diagram of a flow rate adjustment module provided in the present application.
FIG. 5 is another schematic view of the miniaturized modular water quality on-line monitoring system provided herein.
FIG. 6 is a block diagram of an application of the miniaturized modular water quality on-line monitoring system provided by the present application.
Fig. 7A to 7G are graphs of the trend of each parameter in the steady-state operation 1h after the system provided by the present application reaches the rated working condition along with the running time.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings. The exemplary embodiments of the present invention and their descriptions herein are for the purpose of explaining the present invention, but are not to be construed as limiting the invention.
The application provides a miniaturized modularized water quality online monitoring system, which comprises an automatic sampling unit 1, an online measuring unit 2 and an automatic control unit 3 as shown in fig. 1.
The automatic sampling unit 1 comprises a sampling main branch circuit, wherein the sampling main branch circuit comprises a pressure adjusting module 11, a temperature adjusting module 12, a flow adjusting module 13 and a control module 14; the automatic sampling unit 1 is used for adjusting parameters such as pressure, temperature, flow and the like of water quality to be detected entering the sampling main branch circuit to obtain a sample to be detected. The front end of the automatic sampling unit 1 is provided with an electric isolation valve, and when the electric isolation valve is opened, water to be detected enters the automatic sampling unit.
Wherein the structure of the pressure regulating module 11 is shown in fig. 2, the structure of the temperature regulating module 12 is shown in fig. 3, and the structure of the flow regulating module 13 is shown in fig. 4.
As shown in fig. 2, the pressure adjusting module 11 includes:
the filter is used for filtering the water quality to be detected entering the sampling main branch;
the pressure reducing valve is used for automatically adjusting the pressure of the water to be detected entering the sampling main branch so as to adjust the pressure of the water to be detected to a preset target pressure (for example, 0.5 mpa-15.5 mpa shown in fig. 1);
the pressure transmitter is used for measuring the pressure of the water quality to be detected entering the sampling main branch and transmitting the pressure to the pressure reducing valve and the automatic control unit in real time;
the safety valve is used for providing an overpressure protection function, and particularly, when the pressure of water to be detected entering the sampling main branch circuit exceeds a preset safety pressure limit value, the safety valve is opened, so that the water to be detected in the sampling main branch circuit flows out from a pressure relief pipeline connected with the safety valve, and the damage of a system module is avoided.
As shown in fig. 3, the temperature adjustment module 12 includes:
the cooler is used for cooling the water quality to be detected entering the sampling main branch, and the cooler is used for realizing automatic adjustment of the temperature of the water quality to be detected by adjusting the flow of the cooling water so as to reduce the temperature of the water quality to be detected to a preset target temperature (for example, 40-55 ℃ shown in fig. 1);
and the temperature sensor is used for measuring the temperature of the water quality to be detected entering the sampling main branch and transmitting the temperature to the cooler and the automatic control unit in real time so that the cooler can automatically adjust the flow of cooling water according to the temperature.
As shown in fig. 4, the flow rate adjustment module 13 includes:
the flow regulating valve is used for automatically regulating the flow of the water quality to be detected entering the sampling main branch so as to regulate the flow of the water quality to be detected to a preset target flow;
and the flowmeter is used for measuring the flow of the water quality to be detected entering the sampling main branch and transmitting the flow to the flow regulating valve and the automatic control unit in real time.
The control module 14 is configured to control the target pressure corresponding to the pressure adjusting module 11, the target temperature corresponding to the temperature adjusting module 12, and the target flow corresponding to the flow adjusting module 13, so that the pressure adjusting module 11, the temperature adjusting module 12, and the flow adjusting module 13 cooperate together to automatically adjust the parameters of the water to be detected entering the sampling main branch, thereby meeting the water quality detection requirement or the sampling requirement.
The online measurement unit 2 comprises a plurality of measurement branch modules which are respectively used for measuring different water quality parameters of the sample to be measured. The input end of each measuring branch module is connected with the output end of the sampling main branch, and the output end is connected with a waste liquid collecting pipe; each measuring branch module comprises at least one on-line chemical instrument, wherein the on-line chemical instruments comprise, but are not limited to, a conductivity meter, a dissolved hydrogen analyzer, a dissolved oxygen analyzer, a boron meter or a double-channel ion chromatograph, and the measuring can be realized by configuring different on-line chemical instruments according to different water quality measuring requirements. In practical application, each online chemical instrument can be arranged in a combined way according to the emission limit value of the sample to be tested in a serial way, a parallel way or a combination of the two ways. The online measurement unit is used for measuring the water quality parameters of the sample to be measured and is a measurement main body for monitoring the water chemistry parameters.
Specifically, the plurality of measurement branch modules include a conductivity, dissolved hydrogen and dissolved oxygen measurement module 21, a conductivity, dissolved hydrogen and dissolved oxygen data processing module 22, a boron measurement and data processing module 23, and an ion measurement and data processing module 24. The conductivity, dissolved hydrogen and dissolved oxygen measuring module 21 comprises a conductivity meter, a dissolved hydrogen analyzer and a dissolved oxygen analyzer, and is used for measuring the conductivity, the concentration of dissolved hydrogen and the concentration of dissolved oxygen of the sample to be measured in real time. Conductivity, dissolved hydrogen and dissolved oxygen data processing module 22 and electricityThe conductivity, dissolved hydrogen and dissolved oxygen measuring module 21 is connected to receive and process the conductivity, dissolved hydrogen concentration and dissolved oxygen concentration of the sample to be measured by the conductivity, dissolved hydrogen and dissolved oxygen measuring module. The boron measuring and data processing module 23 comprises a boron meter for measuring and processing the boron concentration in the sample to be measured. Included in the ion measurement and data processing module 24 is a dual channel ion chromatograph for measuring the concentration of anions and cations (including but not limited to Cl - 、SO 4 2- 、F-NH 3 、Li + 、Na + 、K + Plasma concentration) is measured and processed. Furthermore, an automatic leaching generating device is also assembled in the online measuring unit 2 and connected with the dual-channel ion chromatograph, so that the automatic leaching liquid configuration function of the dual-channel ion chromatograph can be met, and the use requirement of the leaching liquid of the ion chromatograph can be met.
Because the measurement using conditions of all the online chemical meters are greatly influenced by parameters such as sample temperature, pressure, flow and the like, in order to improve the measurement accuracy and stability of a system device, under the input conditions of high-pressure and low-pressure samples, the system needs to have intelligent functions such as sample automatic acquisition, pressure automatic regulation, flow automatic distribution regulation, temperature automatic regulation and the like according to the using conditions and process requirements of all the online chemical meters such as a conductivity meter, a dissolved hydrogen analyzer, a dissolved oxygen analyzer, a double-channel ion chromatograph, boron concentration analysis and the like, and realizes the automatic control inside the system.
The automatic control unit 3 includes a data acquisition module 31, a power supply and distribution module 32, and a display control module 33, and is configured to acquire, store, display, and transmit process parameters of the automatic sampling unit and the online measurement unit, and implement a power supply and distribution function and an interlocking control. The process parameters acquired by the data acquisition module comprise temperature, pressure, flow and chemical parameters, the process parameters can be transmitted to the electronic equipment of the user in real time and displayed on the display control module, and the user can perform touch operation on the display control module to realize equipment control; the power supply and distribution module mainly supplies power for equipment such as an electric execution structure, an on-line chemical instrument, a process measuring instrument and the like of the whole miniaturized modularized water quality on-line monitoring system. The automatic control unit also provides an interlocking control function, and performs interlocking control on electric executing structures such as an electric stop valve, an electric regulating valve and the like of the miniaturized modularized water quality on-line monitoring system. For example, when the pressure of the water to be detected entering the sampling main branch exceeds a preset pressure limit value or the temperature of the water to be detected entering the sampling main branch exceeds a preset temperature limit value, the automatic control unit controls the electric isolation valve at the front end of the automatic sampling unit to be closed, so that the over-temperature protection and the over-pressure protection functions are realized. And if the pressure continues to rise and exceeds the safety pressure limit value corresponding to the safety valve, the safety valve automatically jumps to release the pressure. The safety pressure limit value corresponding to the safety valve is higher than the pressure limit value corresponding to the automatic control unit.
The working principle of the miniaturized modularized water quality online monitoring system is as follows: after the water quality to be detected enters an automatic sampling unit of the miniaturized modularized water quality online monitoring system, large particulate matters are isolated through a filter of a sampling main branch, the pressure of the water quality to be detected is reduced to a target pressure through a pressure reducing valve, the temperature of the water quality to be detected is reduced to the target temperature through a cooler, and the flow of the water quality to be detected is regulated to be within the allowable range of an online chemical measuring instrument through a flow regulating valve, so that a sample to be detected meeting the measuring requirement and the sampling requirement of the online chemical measuring instrument is obtained; and then respectively inputting the sample to be measured into different measuring branch modules to measure the electric conductivity, the dissolved hydrogen, the dissolved oxygen, the boron and the ion concentration, and directly discharging the measured sample to a waste liquid collecting pipe after flowing through an on-line chemical instrument.
In one embodiment, to facilitate laboratory analysis sampling, the automatic sampling unit 1 further comprises a sampling bottle bypass module 15 disposed between the output of the sampling main bypass and the waste collection pipe, as shown in fig. 5. The sample bottle branch module 15 includes a sample bottle and an isolation valve assembly, wherein one isolation valve assembly is disposed between an inlet of the sample bottle and an output end of the sample main branch, and the other isolation valve assembly is disposed between an outlet of the sample bottle and a waste collection pipe. Wherein, the sampling bottle through take valve quick-operation joint can dismantle connect in the sampling bottle branch road module, be convenient for dismouting and sample isolation. The sampling bottle and the isolation valve component are independently integrated, the sampling bottle has the functions of fixing the volume of a sample and storing, and the isolation valve component realizes the opening and closing of the sampling bottle branch module.
When sampling is needed, the isolation valve assembly of the sampling bottle branch module 15 is opened, and meanwhile, the inlets of the measuring branch modules of the online measuring unit 2 are closed, and at this time, the automatic sampling unit 1 automatically adjusts parameters such as pressure, temperature, flow and the like of water quality to be detected entering the sampling main branch according to preset sampling parameters, so as to obtain a sample to be sampled. The sample to be sampled enters the sampling bottle branch module, flows in from the bottom of the sampling bottle, and when the sampling bottle is full, the redundant sample to be sampled flows out from the top of the sampling bottle to the waste liquid collecting pipe.
When the water quality is required to be detected, the isolation valve assembly of the sampling bottle branch module 15 is closed, the inlet of each measuring branch module of the online measuring unit 2 is opened, and at the moment, the automatic sampling unit 1 automatically adjusts the parameters of the water quality to be detected, such as pressure, temperature, flow and the like, entering the sampling main branch according to preset water quality detection parameters and measurement using conditions of each online chemical instrument, so as to obtain a sample to be detected. The sample to be measured enters each measuring branch module, and the online chemical instrument in each measuring branch module detects the water quality parameters and then flows out to the waste liquid collecting pipe.
The miniaturized modularized water quality online monitoring system has the advantages of simple process flow, high system integration level, small equipment size, low space occupation level, high automation degree and convenient operation, and can simultaneously realize and meet the use requirements of online chemical instruments such as a conductivity meter, a dissolved hydrogen analyzer, a dissolved oxygen analyzer, a double-channel ion chromatograph, a boron concentration analyzer and the like, and the online continuous stable measurement of the water chemical indexes such as the conductivity, the dissolved hydrogen, the dissolved oxygen, the anion, the cation concentration, the boron concentration and the like.
In an embodiment, the pressure adjusting module, the temperature adjusting module, the flow adjusting module, the sampling bottle branch module, the measuring branch modules, the data acquisition module, the power supply and distribution module and the display control module are arranged and installed on the same substrate in a building block splicing mode.
Preferably, the base plate is of a square structure, and is composed of a plurality of unit grids of the same specification, wherein the unit grids are positioning devices for installing each module. Each unit grid is provided with a groove and a threaded hole for aligning and fixing the modules mounted on the unit grid.
The matrix of each module adopts a standard structure type, the matrix size and the unit grid size form a multiple relation, each module has standard and uniform runner interface positions and interface parameters, and the same interface mode is adopted, so that the universality is high, and the modules are conveniently assembled and mounted on the substrate. The base bottom plate of each module is provided with a guide element for positioning and assembling with a groove on the corresponding base unit grid. The modules are connected by adopting sealing gaskets and providing pretightening force by means of the clamping modules.
The matrix of each module is also square in structure, and the matrix is divided into three areas of a top surface, a bottom surface and four peripheral surfaces according to functions. The top surface of the base body is a functional module mounting surface, and structures such as a threaded interface, a valve cavity and the like are arranged according to the requirements of the functional module; the bottom surface of the base body is a module mounting surface and is provided with a guide element for positioning and assembling with a groove on the grid of the base plate unit; the four peripheral surfaces of the base body are runner connecting surfaces, and the directions of the runners are T-shaped, straight-through-shaped and cross-shaped according to requirements.
Specifically, the pressure regulating module has the functions of sample filtration, pressure measurement, automatic pressure regulation, overpressure pressure relief and isolation protection, and the structure of the pressure regulating module can be divided into a functional module and a matrix, and is an up-down structure. The upper part is a functional module (namely a filter, a pressure reducing valve, a pressure transmitter, a safety valve and the like) for realizing functions of filtering, pressure measurement, adjustment driving, stop driving and the like; the lower part is a matrix, so that the functions of a runner, module installation, module connection and the like are realized. The functional modules can be independently formed or integrated, the power supply and control signal cable interfaces of the functional modules adopt standard cable joints, and the cable joints are arranged on the top surface or the tail part of the functional modules, so that the functional modules are convenient to plug and pull.
The temperature regulating module has the functions of temperature measurement, sample cooling and automatic regulation of cooling water flow, and the structure of the temperature regulating module is divided into a functional module and a matrix, and is an up-down structure. The upper part is a functional module (namely a module such as a cooler, a temperature sensor and the like) for realizing the functions of temperature measurement, cooling water flow regulation and driving and the like; the lower part is a matrix, so that the functions of a flow channel, sample cooling, module installation, module connection and the like are realized. The functional modules can be independently integrated or integrated. The design of the cooler follows the principles of compact arrangement, efficient heat exchange and convenient disassembly and assembly, and the plate type heat exchanger structure is preferentially considered.
Similarly, the flow regulating module has the functions of flow measurement and automatic flow regulation, and the structure is divided into a functional module and a base body and is an up-down structure. The upper part is a functional module (namely a flowmeter, a flow regulation module and the like) for realizing the functions of flow measurement, flow regulation driving and the like; the lower part is a matrix, so that the functions of a runner, module installation, module connection and the like are realized. The functional modules can be independently integrated or integrated.
The sampling bottle branch module also comprises a functional module and a base body, wherein the inlet and the outlet of the sampling bottle are arranged on the top surface of the base body and are connected with the flow channel by adopting a hose, so that the sampling bottle branch module can be quickly plugged and pulled out, and no sample overflows in the plugging process.
The conductivity, dissolved hydrogen and dissolved oxygen measuring module adopts a three-in-one integrated flow cell, and the flow cell can realize 360-degree variable-angle installation and operation.
The boron measuring module runner part is of an integrated structure, is integrally arranged on a standard plate or a bracket and is arranged in an up-down structure. The upper part consists of a reaction container, a sample metering tube, a measuring electrode, a stirring device and the like.
The ion measuring module flow channel part consists of a pipe valve module, a sample injection pump, a metering device, a mixing container, a liquid storage tank and the like. The ion measurement module flow channel part has the functions of automatically acquiring quantitative samples, automatically configuring leacheate, automatically conveying the leacheate and the like. The ion measurement module is of an integrated structure, and equipment of the ion measurement module is integrally arranged on a standard plate or a bracket and is arranged in an up-down structure. The upper part consists of a mixing container, a pipe valve module, a sample injection pump, a metering device and the like, and is arranged on a mounting plate or a bracket; the lower part is respectively a concentration liquid tank and a pure water liquid storage tank, and is fixed on the mounting plate, so that the disassembly and the assembly are convenient.
Fig. 6 is a block diagram illustrating an application of the miniaturized modular water quality online monitoring system for use in the test provided in the present application, and it can be understood that fig. 6 only shows a part of modules in the system, and the modules not shown are hidden inside the cabinet. Fig. 6 shows a dissolved oxygen analyzer 61, a dissolved hydrogen analyzer 62, an online measuring unit 2, an automatic control unit 3, a display control module 33, a conductivity meter 63, a sample inlet/outlet connection pipe 64, an automatic sampling unit 1, and an automatic eluent generating device 65, respectively.
When the system shown in fig. 6 is used, after water quality to be detected enters the system from the sample inlet and outlet connecting pipe 64, large particulate matters are isolated through a filter of the automatic sampling unit 1, the pressure is reduced to be below 0.5MPa through a block pressure reducing valve in the automatic sampling unit 1, the temperature is reduced to about 40 ℃ through a cooler in the automatic sampling unit 1, the flow is regulated to be within the allowable range of an online chemical measuring instrument in the online measuring unit 2 through a regulating valve in the automatic sampling unit 1, and conductivity, dissolved hydrogen, dissolved oxygen, boron and ion concentration measurement are respectively carried out by dividing into multiple branches, and the measured samples flow through the online chemical instrument in the online measuring unit 2 and are directly discharged to a waste liquid collecting pipe. The system is provided with a sampling bottle for online sampling. When sampling is carried out, a sampling bottle branch in the automatic sampling unit 1 is opened, a main branch is cut off, a sample enters from the bottom of the sampling bottle, flows out from the top and is discharged to a waste liquid collecting pipe; the sampling bottle is connected by a quick connector and is convenient to disassemble and assemble. The system is provided with automatic pressure regulation control, automatic temperature regulation control and automatic flow regulation control. When the pressure exceeds the allowable range, the electric regulating valve at the front end of the measuring point automatically opens or closes to realize pressure regulation; when the temperature exceeds the allowable range, the electric control valve at the cooling water end automatically opens or closes to increase or decrease the flow of cooling water, so as to realize temperature adjustment, and when the flow exceeds the allowable range, the electric control valve at the flow is automatically opened or closed to realize flow adjustment. In order to ensure the operation safety of the device, the system is provided with overtemperature and overpressure protection. When the pressure and the temperature of the sample exceed the allowable range, the system automatically closes an electric isolation valve at the front end of the automatic sampling unit 1; if the pressure continues to rise, the safety valve in the automatic sampling unit 1 automatically jumps to release pressure beyond the safety valve opening setting value.
Based on the application structure diagram of fig. 6, the application further provides a trend chart of each parameter in steady-state operation 1h along with the operation time after the system reaches the rated working condition under different sample input conditions, please refer to fig. 7A to 7G.
Fig. 7A is a graph showing a variation trend of sample pressure control with test time under a low-pressure sample input condition, wherein the horizontal axis is test time, the vertical axis is test pressure, and the curves in the graph are inlet sample pressure and sample pressure after secondary decompression from top to bottom in sequence; FIG. 7B is a graph showing the variation trend of the sample temperature control with test time under the low-pressure sample input condition, wherein the horizontal axis represents test time, the vertical axis represents test temperature, and the curve in the graph represents cooler outlet sample temperature; FIG. 7C is a graph showing the distribution and control of sample flow over time under low pressure sample input conditions, wherein the horizontal axis represents test time, the vertical axis represents test flow, and the curves represent cooler outlet sample flow, flow cell inlet sample flow, boron meter inlet sample flow, cation channel inlet sample flow, and anion channel inlet sample flow, respectively; FIG. 7D is a graph showing the variation trend of the sample pressure control with test time under the condition of high-pressure sample input, wherein the horizontal axis is test time, the vertical axis is test pressure, and the curves in the graph are inlet sample pressure, sample pressure after primary decompression and sample pressure after secondary decompression from top to bottom in sequence; FIG. 7E is a graph showing the variation trend of sample temperature control with test time under high pressure sample input conditions, wherein the horizontal axis represents test time, the vertical axis represents test temperature, and the graph represents cooler outlet sample temperature; FIG. 7F is a graph showing the variation trend of sample flow control with test time under high-pressure sample input conditions, wherein the horizontal axis represents test time, the unit min, the vertical axis represents test flow, and the unit L/h are respectively the cooler outlet sample flow, the flow cell inlet sample flow, the boron meter inlet sample flow, the cation channel inlet sample flow, and the anion channel inlet sample flow; FIG. 7G is a graph showing the change trend of dissolved hydrogen, dissolved oxygen and conductivity with test time in a water quality monitoring device and a test device, wherein the horizontal axis is test time, the unit min, the vertical axis is dissolved hydrogen and oxygen concentration, and the unit ppm, and curves in the graph are dissolved oxygen 1, dissolved oxygen 2, dissolved hydrogen 1, dissolved hydrogen 2, conductivity 1 and conductivity 2 respectively.
In summary, the miniaturized modularized water quality online monitoring system disclosed by the application is a highly-modular integrated system integrating an automatic sampling unit, an online measuring unit and an automatic control unit, and has the following characteristics and outstanding effects:
1) According to the method, the system is subjected to modularized decomposition and combination through the modularized design method, the flow combination of different equipment, components and pipe fittings of the system is converted into the integration of all stages of modules, and complex flow pictures are simplified into clear and clear module flows, so that the purpose of optimizing the flows is achieved.
2) The unit modules of the system have the same interface mode, so that the universality is strong, the modules are easy to splice and match, and various modified products are conveniently formed.
3) The intelligent control system has the intelligent functions of automatically acquiring samples, automatically adjusting pressure, automatically distributing and adjusting flow, automatically adjusting temperature and the like, and achieves automatic control of the inside of the system.
4) The automatic sampling and automatic measuring and automatic control functions of the on-line chemical instruments such as the conductivity meter, the dissolved hydrogen analyzer, the dissolved oxygen analyzer, the double-channel ion chromatograph and the boron concentration analyzer can be simultaneously realized and met.
5) The method can simultaneously realize the online continuous stable measurement of various water chemistry indexes such as conductivity, dissolved hydrogen, dissolved oxygen, anion concentration, cation concentration, boron concentration and the like in the reactor coolant.
6) According to the water quality on-line monitoring system device, the module integrated assembly function of the water quality on-line monitoring system device is achieved through the modularized integrated design, the equipment size is effectively reduced, the environmental adaptability of the device is improved, the dead volume of the system is reduced, the system can obtain representative samples in an effective range, the sample quantity in the device is small, the radiation dose of the equipment and personnel can be effectively achieved, and the installation and maintenance are convenient.
7) In the automatic sampling unit, parameters (temperature, pressure and flow) of a common sample preparation unit are controlled in a targeted single type and a targeted distributed type, and the automatic sampling unit in the scheme is automatically controlled through a whole set of control system through a preset target value and is adjusted in place once.
8) The three-in-one technology of the dissolved hydrogen analyzer, the dissolved oxygen analyzer and the conductivity meter flow cell and the automatic configuration technology of the double-channel ion chromatography leacheate are provided, the performance of the technology is verified, and a foundation is laid for further upgrading research of a water quality monitoring system.
9) Through modularized design, the water quality on-line monitoring system forms a series of general module systems with relatively independent functions, has specific functions and interface structures, and is installed on site by simple interface connection, so that the system flow is effectively simplified, the on-site installation period is shortened, maintenance is simplified, and the product quality and reliability are improved.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (9)
1. A miniaturized modular water quality on-line monitoring system, comprising:
the automatic sampling unit comprises a sampling main branch circuit, wherein the sampling main branch circuit comprises a pressure regulating module, a temperature regulating module and a flow regulating module; the automatic sampling unit is used for adjusting parameters of water quality to be detected entering the sampling main branch circuit to obtain a sample to be detected;
the on-line measuring unit comprises a plurality of measuring branch modules, the input end of each measuring branch module is connected with the output end of the sampling main branch, and the output end is connected with the waste liquid collecting pipe; each measuring branch module comprises at least one on-line chemical instrument, wherein the on-line chemical instrument comprises a conductivity meter, a dissolved hydrogen analyzer, a dissolved oxygen analyzer, a boron meter or a double-channel ion chromatograph; the online measurement unit is used for measuring the water quality parameters of the sample to be measured;
the automatic control unit comprises a data acquisition module, a power supply and distribution module and a display control module and is used for performing process parameter measurement, process parameter transmission, power supply and interlocking control on the online measurement unit;
the automatic sampling unit further comprises a sampling bottle branch module arranged between the sampling main branch and the waste liquid collecting pipe; the sampling bottle branch module comprises a sampling bottle and an isolation valve assembly, and the sampling bottle is detachably connected into the sampling bottle branch module through a quick connector with a valve;
when sampling is needed, the isolation valve component is opened, the inlet of the measuring branch module is closed, so that a sample to be measured enters the sampling bottle from the bottom and flows out from the top; when water quality detection is needed, the isolation valve component is closed, and the inlet of the measuring branch module is opened, so that a sample to be detected enters each measuring branch module; and
the substrate consists of a plurality of unit grids with the same specification;
the pressure regulating module, the temperature regulating module, the flow regulating module, the sampling bottle branch module, the measuring branch modules, the data acquisition module, the power supply and distribution module and the display control module are of standard structure types, and the matrix size of each module is in a multiple relation with the unit grid size; each module has standard and unified runner interface position and interface parameters, and adopts the same interface mode; each module is arranged and installed on different unit grids of the same substrate in a building block splicing mode.
2. The miniaturized modular water quality online monitoring system of claim 1 wherein the pressure regulation module comprises:
the filter is used for filtering the water quality to be detected entering the sampling main branch;
the pressure reducing valve is used for adjusting the pressure of the water to be detected entering the sampling main branch to a preset target pressure;
the pressure transmitter is used for measuring the pressure of the water quality to be detected entering the sampling main branch and transmitting the pressure to the pressure reducing valve and the automatic control unit in real time;
and a safety valve for providing an overpressure protection function.
3. The miniaturized modular water quality online monitoring system of claim 1 wherein the temperature regulation module comprises:
the cooler is used for cooling the water quality to be detected entering the sampling main branch;
and the temperature sensor is used for measuring the temperature of the water quality to be detected entering the sampling main branch and transmitting the temperature to the cooler and the automatic control unit in real time so that the cooler can automatically adjust the flow of cooling water according to the temperature.
4. The miniaturized modular water quality online monitoring system of claim 1 wherein the flow regulation module comprises:
the flow regulating valve is used for regulating the flow of the water quality to be detected entering the sampling main branch;
and the flowmeter is used for measuring the flow of the water quality to be detected entering the sampling main branch and transmitting the flow to the flow regulating valve and the automatic control unit in real time.
5. The miniaturized modular water quality online monitoring system of claim 1 wherein the plurality of measurement branch modules comprises:
the conductivity, dissolved hydrogen and dissolved oxygen measuring module is used for measuring the conductivity, the concentration of the dissolved hydrogen and the concentration of the dissolved oxygen of the sample to be measured in real time;
the conductivity, dissolved hydrogen and dissolved oxygen data processing module is used for receiving and processing the conductivity, the dissolved hydrogen concentration and the dissolved oxygen concentration of the sample to be measured by the conductivity, dissolved hydrogen and dissolved oxygen measuring module;
the boron measuring and data processing module is used for measuring and processing the boron concentration in the sample to be measured;
and the ion measurement and data processing module is used for measuring and processing the concentration of anions and cations in the sample to be measured.
6. The miniaturized modular water quality online monitoring system of any of claims 1 to 5 wherein the pressure regulation module, temperature regulation module, flow regulation module, sample bottle branch module, measurement branch modules, data acquisition module, power supply and distribution module, and display control module are mounted on the same substrate.
7. The miniaturized modular water quality online monitoring system of claim 6 wherein the base plate comprises a plurality of unit grids of the same specification, each unit grid having a recess and a threaded hole therein for securing a module mounted thereon.
8. The miniaturized modular water quality online monitoring system of claim 7 wherein each module has the same runner interface location and interface parameters to facilitate the assembly and installation of each module on a substrate.
9. The miniaturized modular water quality online monitoring system of claim 8 wherein the modules are isolated by a gasket seal.
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