CN115656275A - Heavy water quality monitoring and hierarchical storage system - Google Patents
Heavy water quality monitoring and hierarchical storage system Download PDFInfo
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- CN115656275A CN115656275A CN202211135917.3A CN202211135917A CN115656275A CN 115656275 A CN115656275 A CN 115656275A CN 202211135917 A CN202211135917 A CN 202211135917A CN 115656275 A CN115656275 A CN 115656275A
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Abstract
The invention belongs to the technical field of heavy water quality monitoring, and particularly relates to a heavy water quality monitoring and graded storage system which is used for monitoring and graded storage of heavy water subjected to upgrading treatment by a preceding stage purification unit (1), and comprises an electric conductivity and flow monitoring unit and a heavy water concentration online analysis unit which are connected through a third pipeline (10), wherein the electric conductivity and flow monitoring unit is connected to one end of the downstream of the preceding stage purification unit (1), and the heavy water quality monitoring and graded storage system also comprises a heavy water storage system which is connected with the electric conductivity and flow monitoring unit and the heavy water concentration online analysis unit. The invention utilizes the working principle of the electromagnetic flowmeter to innovatively integrate the conductivity monitoring function and the flow monitoring function into a whole, thereby avoiding the installation of a conductivity meter, reducing the use cost, being convenient for installation, automatically regulating and controlling the direction of heavy water according to related measurement results and realizing the automatic water quality detection and classified storage of the heavy water.
Description
Technical Field
The invention belongs to the technical field of heavy water quality monitoring, and particularly relates to a heavy water quality monitoring and grading storage system.
Background
The heavy water thermal neutron absorption cross section is small, the neutron economy is good, and the heavy water reactor moderator is high-quality. However, deuterium in reactor moderator heavy water can generate a neutron capture reaction to generate tritium, which brings inconvenience to the operation and maintenance of the reactor. In addition, the heavy water inevitably leaks during the operation of the reactor, and exchanges with the light water in the environment to introduce protium, so that the concentration of the heavy water is reduced, and the quality is degraded. In order to maintain the cleanliness of the reactor heavy water, the nuclear power plant moderator heavy water needs to be purified and upgraded. The quality of the heavy water after upgrading treatment needs to be strictly monitored so as to meet the use requirement of the heavy water for the reactor moderator. At present, the quality of heavy water subjected to upgrading treatment is mostly detected in a graded off-line mode, namely, the heavy water is sampled and measured respectively according to detection requirements, and after all test results are obtained, the quality grade can be judged, and the storage destination is determined, so that a process automation quality monitoring and graded storage system is lacked.
Disclosure of Invention
The invention aims to provide a heavy water quality monitoring system, which can realize automatic water quality detection and graded storage by interlocking on-line analysis and measurement equipment and pipeline switching equipment and automatically regulating and controlling the direction of heavy water according to related measurement results.
In order to achieve the above purpose, the technical scheme adopted by the invention is a heavy water quality monitoring and grading storage system which is used for monitoring and grading heavy water subjected to upgrading treatment by a preceding stage purification unit, wherein the heavy water quality monitoring and grading storage system comprises an electric conductivity and flow monitoring unit and a heavy water concentration online analysis unit which are connected through a third pipeline, the electric conductivity and flow monitoring unit is connected with one end of the downstream of the preceding stage purification unit, and the heavy water quality monitoring and grading storage system also comprises a heavy water storage system which is connected with the electric conductivity and flow monitoring unit and the heavy water concentration online analysis unit.
Further, in the present invention,
the heavy water storage system comprises a low-grade heavy water storage tank, a medium-grade heavy water storage tank and a high-grade heavy water storage tank;
the top end of the first pipeline is connected with the pre-stage purification unit, and the tail end of the first pipeline is connected with the conductivity and flow monitoring unit;
the top end of the fourth pipeline is connected to the rear end of the conductivity and flow monitoring unit, and the tail end of the fourth pipeline is connected with the low-grade heavy water storage tank;
the rear end of the conductivity and flow monitoring unit is provided with a first output pipe, the top end of the first output pipe is connected with the rear end of the conductivity and flow monitoring unit, the tail end of the first output pipe is used as a first outlet, and the top end of the third pipeline and the top end of the fourth pipeline are converged at the first outlet and are communicated with the conductivity and flow monitoring unit through the first output pipe;
the top end of the fifth pipeline is connected to the rear end of the heavy water concentration online analysis unit, and the tail end of the fifth pipeline is connected with the high-grade heavy water storage tank;
the top end of the sixth pipeline is connected to the rear end of the heavy water concentration on-line analysis unit, and the tail end of the sixth pipeline is connected with the medium-grade heavy water storage tank;
the heavy water concentration on-line analysis unit rear end is equipped with the second output tube, the top of second output tube is connected the heavy water concentration on-line analysis unit rear end, the tail end of second output tube is as the second export, the top of fifth pipeline with the top of sixth pipeline intersect in the second export, and pass through the second output tube with heavy water concentration on-line analysis unit intercommunication.
Further, the first pipeline, the third pipeline, the fourth pipeline, the fifth pipeline and the sixth pipeline are all controlled by a valve assembly with communication operation capability, such as a solenoid valve; the first pipeline, the third pipeline, the fourth pipeline, the fifth pipeline and the sixth pipeline are all provided with a flow meter and a pressure meter for measuring the flow and the pressure of heavy water at corresponding positions; and valves and bypasses for maintenance are arranged at the two ends of the conductivity and flow monitoring unit and the heavy water concentration online analysis unit so as to facilitate overhauling and element replacement.
The control terminal is used for controlling the conductivity and flow monitoring unit, the heavy water concentration online analysis unit and the valve assembly; the conductivity and flow monitoring unit, the heavy water concentration on-line analysis unit and the valve assembly are used for monitoring variable values, analysis results and control signals which are transmitted to the control terminal through a PLC, and the control terminal is used for analyzing signals, comparing quantity values, judging in stages, controlling elements and calculating in an accumulated mode, comprehensively regulating and controlling the circulation state of each pipeline, and enabling the heavy water with the corresponding heavy water concentration to flow into the heavy water storage tanks with the corresponding levels.
Further, in the present invention,
the conductivity and flow monitoring unit is used for carrying out first analysis on the heavy water and carrying out first grading on the heavy water;
the first grading comprises the steps of conveying the heavy water with qualified first analysis result to the heavy water concentration online analysis unit for second analysis, and conveying the heavy water with unqualified first analysis result to the low-grade heavy water storage tank for storage;
the first analysis refers to monitoring the conductivity of the heavy water subjected to the upgrading treatment of the preceding stage purification unit, wherein if the conductivity of the heavy water is qualified, the first analysis result is qualified, and otherwise, the first analysis result is unqualified.
Further, in the present invention, it is preferable that,
the conductivity and flow monitoring unit comprises a preceding stage output flow controller and an electromagnetic flowmeter which are connected in series through a second pipeline, and the preceding stage output flow controller is close to one end of the downstream of the preceding stage purification unit;
the pre-stage output flow controller is used for performing chain starting on the heavy water quality monitoring and grading storage system, and when the heavy water conveyed by the pre-stage purification unit meets a set flow limit value, the heavy water quality monitoring and grading storage system can be started in a chain manner;
the electromagnetic flowmeter is used for monitoring the flow of the heavy water and is also used for the first analysis to judge whether the conductivity of the heavy water is qualified.
Further, the first classification includes the following two cases:
firstly, if the reading of the electromagnetic flowmeter is consistent with the conveying flow of the preceding stage purification unit, namely the reading of the preceding stage output flow controller, and is stably kept, the conductivity of the heavy water is unqualified, the control terminal automatically associates the valve assembly opening to the pipeline path of the low-stage heavy water storage tank, and conveys the heavy water with the unqualified conductivity to the low-stage heavy water storage tank for temporary storage for subsequent treatment; meanwhile, the liquid storage capacity in the low-level heavy water storage tank is determined by correlating and accumulating the conveying flow of the preceding-stage purification unit, namely the heavy water flow flowing through the preceding-stage output flow controller;
secondly, if the reading fluctuation of the electromagnetic flowmeter is abnormal, the conveying flow of the pre-stage purification unit, namely the reading of the pre-stage output flow controller is stable, the conductivity of the heavy water is qualified, the control terminal automatically associates the valve assembly opening to the path of the heavy water concentration online analysis unit, and conveys the heavy water with qualified conductivity to the heavy water concentration online analysis unit for further secondary analysis;
simultaneously monitoring the heavy water pressure of corresponding points on the pipeline through the pressure gauge;
in the first case, the criterion for determining whether the reading of the electromagnetic flowmeter is consistent with the reading of the preceding stage output flow controller is determined by the measurement accuracy of the electromagnetic flowmeter and the measurement accuracy of the preceding stage output flow controller, and when the reading of the electromagnetic flowmeter is consistent with and stable in the reading of the preceding stage output flow controller, the difference between the reading of the electromagnetic flowmeter and the reading of the preceding stage output flow controller is not higher than 5 times of the measurement accuracy of the larger one of the electromagnetic flowmeter and the preceding stage output flow controller, and the fluctuation of the reading of the electromagnetic flowmeter and the measurement accuracy of the electromagnetic flowmeter should be in one order, and particularly not higher than 3 times of the measurement accuracy of the electromagnetic flowmeter;
in the second case, the reading fluctuation abnormality of the electromagnetic flowmeter means that the difference between the reading of the electromagnetic flowmeter and the reading of the preceding stage output flow controller is not less than 30 times of the measurement accuracy of the electromagnetic flowmeter;
in the second case, the criterion for determining the stability of the transport flow rate of the pre-purification unit is determined by the measurement accuracy of the pre-output flow rate controller, and when the transport flow rate of the pre-purification unit is stable, the fluctuation of the reading of the pre-output flow rate controller should be in an order of magnitude, preferably not more than 3 times, of the measurement accuracy of the pre-output flow rate controller.
Furthermore, the length of the first output pipe can ensure that when the first-time grading operation logic instruction is obtained, the heavy water corresponding to the analysis result of the first-time analysis does not obtain a definite grading flow direction, so that the high-grade heavy water storage tank is not polluted by low-grade heavy water due to delay of the analysis result, and the low-grade heavy water refers to the heavy water with unqualified conductivity.
Further, in the present invention,
the heavy water concentration online analysis unit is used for carrying out the second analysis on the heavy water qualified in the first analysis result, carrying out the second classification on the heavy water, and distributing the heavy water to the medium-grade heavy water storage tank or the high-grade heavy water storage tank; the second analysis refers to heavy water concentration analysis;
the heavy water with the analysis result of the heavy water concentration analysis reaching a preset heavy water concentration limit value is automatically associated with the valve assembly of the path opened to the high-grade heavy water storage tank through the control terminal and is conveyed to the high-grade heavy water storage tank for storage; meanwhile, the liquid storage capacity in the high-grade heavy water storage tank is determined by correlating and accumulating the conveying flow of the preceding stage purification unit, namely the heavy water flow flowing through the preceding stage output flow controller;
if the analysis result of the heavy water concentration analysis does not meet the heavy water with the preset heavy water concentration limit value, automatically associating the valve assembly of the path opened to the middle-grade heavy water storage tank through the control terminal, and conveying the valve assembly to the middle-grade heavy water storage tank for temporary storage for later treatment; meanwhile, the liquid storage amount in the middle-stage heavy water storage tank is determined by correlating and accumulating the conveying flow of the pre-stage purification unit, namely the heavy water flow flowing through the pre-stage output flow controller.
Further, the length of the second output pipe can ensure that when the second-stage operation logic instruction is obtained, the heavy water corresponding to the analysis result of the second analysis does not obtain a clear stage flow direction, so as to ensure that the high-grade heavy water storage tank is not polluted by low-grade heavy water due to delay of the analysis result, wherein the low-grade heavy water is the heavy water of which the analysis result of the heavy water concentration analysis does not meet a preset heavy water concentration limit value.
The invention has the beneficial effects that:
1. through the chain online analysis measuring equipment (comprising the electromagnetic flowmeter 3 and the infrared spectrometer 4) and the pipeline switching equipment (namely a valve component), the heavy water direction is automatically regulated and controlled according to the related measuring result, and the automatic water quality detection and the classified storage of the heavy water are realized.
2. By using the working principle of the electromagnetic flowmeter 3, the conductivity monitoring function and the flow monitoring function are innovatively integrated, the installation of a conductivity meter is omitted, the use cost is reduced, and the installation is convenient.
3. The system working state is related to the heavy water (preceding stage liquid) conveying condition of the preceding stage purification unit 1, and the effectiveness of the system working is improved.
4. The pipeline design of the third pipeline 10, the fifth pipeline 12 and the sixth pipeline 13 reserves analysis feedback time (namely reserves pipelines with enough length), and the grading control is more accurate.
Drawings
FIG. 1 is a schematic diagram of a heavy water quality monitoring and staging storage system according to an embodiment of the invention;
in the figure: 1-a preceding stage purification unit, 2-a preceding stage output flow controller, 3-an electromagnetic flow meter, 4-an infrared spectrometer, 5-a low-stage heavy water storage tank, 6-a medium-stage heavy water storage tank, 7-a high-stage heavy water storage tank, 8-a first pipeline, 9-a second pipeline, 10-a third pipeline, 11-a fourth pipeline, 12-a fifth pipeline, 13-a sixth pipeline, 14-a first output pipe, 15-a first outlet, 16-a second output pipe, and 17-a second outlet.
Detailed Description
The invention is further described below with reference to the figures and examples.
The invention provides a heavy water quality monitoring and grading storage system (shown in figure 1) which is used for monitoring and grading storage of heavy water subjected to upgrading treatment by a preceding stage purification unit 1, and comprises a conductivity and flow monitoring unit and a heavy water concentration online analysis unit which are connected through a third pipeline 10, wherein the conductivity and flow monitoring unit is connected to the downstream end of the preceding stage purification unit 1 through the third pipeline 10, and the heavy water quality monitoring and grading storage system also comprises a heavy water storage system connected with the conductivity and flow monitoring unit and the heavy water concentration online analysis unit.
The heavy water storage system comprises a low-grade heavy water storage tank 5, a medium-grade heavy water storage tank 6 and a high-grade heavy water storage tank 7;
the device also comprises a first pipeline 8, wherein the top end of the first pipeline 8 is connected with the pre-stage purification unit 1, and the tail end of the first pipeline 8 is connected with a conductivity and flow monitoring unit;
the top end of the fourth pipeline 11 is connected with the rear end of the conductivity and flow monitoring unit, and the tail end of the fourth pipeline 11 is connected with the low-grade heavy water storage tank 5;
a first output pipe 14 is arranged at the rear end of the conductivity and flow monitoring unit, the top end of the first output pipe 14 is connected with the rear end of the conductivity and flow monitoring unit, the tail end of the first output pipe 14 is used as a first outlet 15, the top end of the third pipeline 10 and the top end of the fourth pipeline 11 are converged at the first outlet 15, and are communicated with the conductivity and flow monitoring unit through the first output pipe 14;
the device also comprises a fifth pipeline 12, the top end of the fifth pipeline 12 is connected with the rear end of the heavy water concentration online analysis unit, and the tail end of the fifth pipeline 12 is connected with the advanced heavy water storage tank 7;
the heavy water concentration on-line analysis device further comprises a sixth pipeline 13, the top end of the sixth pipeline 13 is connected to the rear end of the heavy water concentration on-line analysis unit, and the tail end of the sixth pipeline 13 is connected with the medium-grade heavy water storage tank 6;
the rear end of the heavy water concentration on-line analysis unit is provided with a second output pipe 16, the top end of the second output pipe 16 is connected with the rear end of the heavy water concentration on-line analysis unit, the tail end of the second output pipe 16 is used as a second outlet 17, the top end of the fifth pipeline 12 and the top end of the sixth pipeline 13 are intersected at the second outlet 17, and the heavy water concentration on-line analysis unit is communicated with the heavy water concentration on-line analysis unit through the second output pipe 16.
The first pipeline 8, the third pipeline 10, the fourth pipeline 11, the fifth pipeline 12 and the sixth pipeline 13 (all of which are buffering and analyzing pipelines) are controlled by valve assemblies with communication operation capacity, such as electromagnetic valves, so that the automatic switching of heavy water pipeline flow channels is realized; the first pipeline 8, the third pipeline 10, the fourth pipeline 11, the fifth pipeline 12 and the sixth pipeline 13 are all provided with a flowmeter and a pressure gauge for measuring the flow and pressure of heavy water at corresponding positions, and are used for meeting the heavy water flow and pressure monitoring requirements of corresponding points on the whole analysis and storage path pipeline related in the process technology; and valves and bypasses for maintenance are arranged at two ends of the conductivity and flow monitoring unit and the heavy water concentration online analysis unit so as to facilitate overhauling and element replacement.
The control terminal is used for controlling the conductivity and flow monitoring unit, the heavy water concentration online analysis unit and the valve assembly; the monitoring variable values, the analysis results and the control signals of the conductivity and flow monitoring unit, the heavy water concentration online analysis unit and the valve assembly are all transmitted to a control terminal through a PLC, and the control terminal is responsible for signal analysis, magnitude comparison, grading judgment, element control, accumulative calculation and the like, comprehensively regulates and controls the flow state of each pipeline, so that the heavy water with the corresponding heavy water concentration flows into the heavy water storage tanks with the corresponding grades to be used for subsequent disposal.
The conductivity and flow monitoring unit is used for carrying out first analysis on the heavy water and carrying out first classification on the heavy water;
the first grading comprises the steps of conveying heavy water with qualified first analysis results to a heavy water concentration online analysis unit for second analysis, and conveying heavy water with unqualified first analysis results to a low-grade heavy water storage tank 5 for storage;
the first analysis refers to monitoring the conductivity of the heavy water after the upgrading treatment of the preceding-stage purification unit 1 (monitoring the electrolyte content in the upgraded heavy water), and if the conductivity of the heavy water is qualified, the first analysis result is qualified, otherwise, the first analysis result is unqualified.
The conductivity and flow monitoring unit comprises a preceding stage output flow controller 2 and an electromagnetic flow meter 3 which are connected in series through a second pipeline 9, wherein the preceding stage output flow controller 2 is close to one end of the downstream of the preceding stage purification unit 1;
the preceding stage output flow controller 2 is used for the chain start of the heavy water quality monitoring and grading storage system (namely the system), and when the heavy water conveyed by the preceding stage purification unit 1 meets the set flow limit value, the heavy water quality monitoring and grading storage system can be started in a chain manner; the monitored heavy water comes from the preceding purification unit 1, so the working state of the system needs to be related to the effective working state of the preceding purification unit 1; it is designed to determine whether the system is put into operation by correlating the liquid flow rate in the interface line of the preceding purification unit 1: when the liquid delivered by the preceding-stage purification unit 1 meets a certain flow limit value, the system can be started in a chain manner, otherwise, the heavy water output does not exist in the preceding-stage purification unit 1, and the system is put into a dormant state. In a dormant state, the system main logic control program stops collecting data from the related analysis equipment and executes logic comparison and grading operation;
the electromagnetic flow meter 3 is used for monitoring the flow of heavy water flowing through the conductivity and flow monitoring unit and the subsequent heavy water concentration online analysis unit, and is also used for first analysis to judge whether the conductivity of the heavy water is qualified; the electromagnetic flow meter 3 measures the flow of the conductive fluid by utilizing the electromagnetic induction principle according to the electromotive force induced by cutting a magnetic induction line when the conductive fluid passes through an external magnetic field; based on the above, the electromagnetic flowmeter 3 has all requirements for the conductivity of the measured liquid, and when the conductivity of the flowing liquid is too low, the induced electromotive force is difficult to be effectively detected; the general electromagnetic flowmeter 3 has the lower limit requirement of conductivity on the measured medium, and when the conductivity of the fluid is lower than the lower limit requirement of the conductivity of the detected medium, the indication value of the electromagnetic flowmeter 3 is reduced and becomes unstable; the method comprises the steps of judging the conductivity range of circulating heavy water by monitoring the indicating value stability of the electromagnetic flowmeter 3 by utilizing the characteristic that the electromagnetic flowmeter 3 cannot normally work when encountering low-conductivity fluid and can generate indicating value errors; the conductivity monitoring and flow monitoring functions are innovatively integrated, the difference of the front-stage purification unit 1 in the conveying flow of the system is synchronously compared by monitoring the stability of the reading of the electromagnetic flow meter 3, the conductivity change condition of heavy water flowing through is determined, and primary classification is carried out on the basis of the conductivity change condition; compared with the traditional scheme of the electromagnetic flowmeter and the conductivity meter, the scheme omits the installation of the conductivity meter, reduces the use cost and is convenient to install.
The first classification includes the following two cases:
firstly, if the reading of the electromagnetic flowmeter 3 is consistent with the conveying flow of the preceding-stage purification unit 1 (namely the reading of the preceding-stage output flow controller 2) and is stably kept, the conductivity of the heavy water is unqualified, the control terminal automatically associates the valve assembly of the pipeline path opened to the low-stage heavy water storage tank 5, and the heavy water with the unqualified conductivity is conveyed to the low-stage heavy water storage tank 5 for temporary storage for subsequent treatment; at the same time, the liquid reserve in the low-grade heavy water storage tank 5 is determined by correlating the delivery flow rate of the accumulated preceding-stage purification unit 1 (i.e., the flow rate of heavy water flowing through the preceding-stage output flow controller 2);
secondly, if the reading fluctuation of the electromagnetic flowmeter 3 is abnormal, the conveying flow of the pre-stage purification unit 1 (namely the reading of the pre-stage output flow controller 2) is stable, the conductivity of the heavy water is qualified, the control terminal automatically associates the valve assembly opening to the path of the heavy water concentration online analysis unit, and the heavy water with qualified conductivity is conveyed to the heavy water concentration online analysis unit for further secondary analysis;
and simultaneously, monitoring the heavy water pressure of corresponding points on the pipeline through a pressure meter (the pipeline comprises an analysis and storage path in the process).
In the first case, the criterion for determining whether the reading of the electromagnetic flowmeter 3 is consistent and stable with the reading of the preceding stage output flow controller 2 is determined by the measurement accuracy of the electromagnetic flowmeter 3 and the measurement accuracy of the preceding stage output flow controller 2, when the reading of the electromagnetic flowmeter 3 is consistent and stable with the reading of the preceding stage output flow controller 2, the difference between the reading of the electromagnetic flowmeter 3 and the reading of the preceding stage output flow controller 2 is not higher than 5 times of the measurement accuracy of the larger one of the electromagnetic flowmeter 3 and the preceding stage output flow controller 2, and the fluctuation of the reading of the electromagnetic flowmeter 3 and the measurement accuracy of the electromagnetic flowmeter 3 should be in an order of magnitude, particularly not higher than 3 times of the measurement accuracy of the electromagnetic flowmeter 3;
in the second case, the reading fluctuation abnormality of the electromagnetic flowmeter 3 means that the difference (absolute value) between the reading of the electromagnetic flowmeter 3 and the reading of the preceding stage output flow controller 2 is not less than 30 times the measurement accuracy of the electromagnetic flowmeter 3; the judgment of the abnormal reading fluctuation of the electromagnetic flowmeter 3 may specifically be: the reading of the electromagnetic flowmeter 3 is reduced to less than half of the reading of the output flow controller 2 at the front stage, and the electromagnetic flowmeter fluctuates greatly around a certain low flow value, and the fluctuation amplitude exceeds 50% of the average value of the flow in the fluctuation period; by way of example: precision of the electromagnetic flowmeter: 1% FS, preceding stage cleaning unit 1 delivery flow rate: 100L/min, electromagnetic flowmeter reading: 30 +/-20L/min, which is the abnormal fluctuation of the reading in the case;
in the second case, the criterion for determining the stability of the delivery flow rate of the preceding purification unit 1 is determined by the measurement accuracy of the preceding output flow rate controller 2, and when the delivery flow rate of the preceding purification unit 1 is stable, the fluctuation of the reading of the preceding output flow rate controller 2 should be in the order of magnitude of the measurement accuracy of the preceding output flow rate controller 2, and particularly, preferably not more than 3 times the measurement accuracy of the preceding output flow rate controller 2.
According to the system design flow, the analysis feedback time and the pipeline diameter, the first output pipe 14 needs to reserve enough length, and the length of the first output pipe 14 can ensure that when the first-time grading operation logic instruction is obtained, the real heavy water corresponding to the analysis result (the monitoring result of the conductivity of the heavy water) of the first-time analysis does not obtain a definite grading flow direction (namely, the real heavy water is not distributed to a specific heavy water storage tank of a certain grade), so that the high-grade heavy water storage tank 7 is not polluted by the low-grade heavy water due to the delay of the analysis result, and the low-grade heavy water refers to the heavy water with unqualified conductivity.
The heavy water concentration online analysis unit is used for carrying out secondary analysis on the heavy water with qualified first analysis result (namely qualified conductivity), carrying out secondary classification on the heavy water, and distributing the heavy water to the medium-grade heavy water storage tank 6 or the high-grade heavy water storage tank 7; the second analysis is heavy water concentration analysis;
the heavy water with the analysis result of the heavy water concentration analysis reaching the preset heavy water concentration limit value is automatically associated with the valve assembly of the path opened to the high-level heavy water storage tank 7 through the control terminal and is conveyed to the high-level heavy water storage tank 7 for storage; meanwhile, the liquid storage amount in the high-grade heavy water storage tank 7 is determined by correlating and accumulating the conveying flow of the preceding-stage purification unit 1, namely the heavy water flow passing through the preceding-stage output flow controller 2;
if the analysis result of the heavy water concentration analysis does not meet the heavy water with the preset heavy water concentration limit value, automatically associating a valve assembly of a path opening to the middle-grade heavy water storage tank 6 through a control terminal, and conveying the valve assembly to the middle-grade heavy water storage tank 6 for temporary storage for later treatment; meanwhile, the liquid storage amount in the middle heavy water storage tank 6 is determined by correlating the delivery flow rate of the preceding stage purification unit 1, that is, the heavy water flow rate flowing through the preceding stage output flow rate controller 2.
Due to the working principle of the equipment and the requirement of calculation and judgment, the real-time analysis result provided by the online analysis equipment has hysteresis and is not matched with the actual flowing fluid in time and space. Similarly, the second output pipe 16 located at the rear end of the online heavy water concentration analysis unit and before the heavy water storage system needs to reserve a sufficient length, and the length of the second output pipe 16 can ensure that when the operation logic command for the second classification is obtained, the real heavy water corresponding to the analysis result of the second analysis (the analysis result of the heavy water concentration analysis) does not obtain a clear classification flow direction (that is, the real heavy water is not distributed to a specific heavy water storage tank of a certain level), so as to ensure that the high-level heavy water storage tank 7 is not polluted by low-level heavy water due to the delay of the analysis result, and the low-level heavy water is heavy water whose analysis result does not satisfy the preset heavy water concentration limit value.
The device according to the present invention is not limited to the embodiments described in the specific embodiments, and those skilled in the art can derive other embodiments according to the technical solutions of the present invention, and also belong to the technical innovation scope of the present invention.
Claims (10)
1. The utility model provides a heavy water quality monitoring and hierarchical storage system for carry out monitoring and hierarchical storage to the heavy water after going through preceding stage purification unit (1) upgrading processing, characterized by: the system comprises a conductivity and flow monitoring unit and a heavy water concentration online analysis unit which are connected through a third pipeline (10), wherein the conductivity and flow monitoring unit is connected to one end of the downstream of a preceding stage purification unit (1), and the system also comprises a heavy water storage system connected with the conductivity and flow monitoring unit and the heavy water concentration online analysis unit.
2. The heavy water quality monitoring and staging storage system as claimed in claim 1, wherein:
the heavy water storage system comprises a low-grade heavy water storage tank (5), a medium-grade heavy water storage tank (6) and a high-grade heavy water storage tank (7);
the device also comprises a first pipeline (8), the top end of the first pipeline (8) is connected with the pre-stage purification unit (1), and the tail end of the first pipeline (8) is connected with the conductivity and flow monitoring unit;
the top end of the fourth pipeline (11) is connected with the rear end of the conductivity and flow monitoring unit, and the tail end of the fourth pipeline (11) is connected with the low-grade heavy water storage tank (5);
a first output pipe (14) is arranged at the rear end of the conductivity and flow monitoring unit, the top end of the first output pipe (14) is connected with the rear end of the conductivity and flow monitoring unit, the tail end of the first output pipe (14) is used as a first outlet (15), the top end of the third pipeline (10) and the top end of the fourth pipeline (11) are intersected with the first outlet (15), and the third pipeline and the fourth pipeline are communicated with the conductivity and flow monitoring unit through the first output pipe (14);
the top end of the fifth pipeline (12) is connected to the rear end of the heavy water concentration online analysis unit, and the tail end of the fifth pipeline (12) is connected with the high-grade heavy water storage tank (7);
the top end of the sixth pipeline (13) is connected to the rear end of the heavy water concentration online analysis unit, and the tail end of the sixth pipeline (13) is connected with the middle-stage heavy water storage tank (6);
the heavy water concentration on-line analysis unit rear end is equipped with second output tube (16), the top of second output tube (16) is connected the heavy water concentration on-line analysis unit rear end, the tail end of second output tube (16) is as second export (17), the top of fifth pipeline (12) with the top of sixth pipeline (13) intersect in second export (17), and pass through second output tube (16) with heavy water concentration on-line analysis unit intercommunication.
3. The heavy water quality monitoring and staging storage system as claimed in claim 2, wherein: the first pipeline (8), the third pipeline (10), the fourth pipeline (11), the fifth pipeline (12) and the sixth pipeline (13) are all controlled by valve components with communication operation capacity, such as solenoid valves; the first pipeline (8), the third pipeline (10), the fourth pipeline (11), the fifth pipeline (12) and the sixth pipeline (13) are provided with flow meters and pressure meters for measuring the flow rate and pressure of heavy water at corresponding positions; and valves and bypasses for maintenance are arranged at the two ends of the conductivity and flow monitoring unit and the heavy water concentration online analysis unit so as to facilitate overhauling and element replacement.
4. The heavy water quality monitoring and staging storage system as claimed in claim 3, wherein: the control terminal is used for controlling the conductivity and flow monitoring unit, the heavy water concentration online analysis unit and the valve assembly; the conductivity and flow monitoring unit, the heavy water concentration on-line analysis unit and the valve assembly are used for monitoring variable values, analysis results and control signals which are transmitted to the control terminal through a PLC, and the control terminal is used for analyzing signals, comparing quantity values, judging in stages, controlling elements and calculating in an accumulated mode, comprehensively regulating and controlling the circulation state of each pipeline, and enabling the heavy water with the corresponding heavy water concentration to flow into the heavy water storage tanks with the corresponding levels.
5. The heavy water quality monitoring and staging storage system as claimed in claim 4, wherein:
the conductivity and flow monitoring unit is used for carrying out first analysis on the heavy water and carrying out first classification on the heavy water;
the first grading comprises the steps of conveying the heavy water with qualified first analysis result to the heavy water concentration online analysis unit for second analysis, and conveying the heavy water with unqualified first analysis result to the low-grade heavy water storage tank (5) for storage;
the first analysis refers to monitoring the conductivity of the heavy water subjected to upgrading treatment by the preceding-stage purification unit (1), wherein if the conductivity of the heavy water is qualified, the first analysis result is qualified, and otherwise, the first analysis result is unqualified.
6. The heavy water quality monitoring and staging storage system as claimed in claim 5, wherein:
the conductivity and flow monitoring unit comprises a preceding stage output flow controller (2) and an electromagnetic flow meter (3) which are connected in series through a second pipeline (9), wherein the preceding stage output flow controller (2) is close to one end of the downstream of the preceding stage purification unit (1);
the preceding stage output flow controller (2) is used for performing chain starting on the heavy water quality monitoring and grading storage system, and when the heavy water conveyed by the preceding stage purification unit (1) meets a set flow limit value, the heavy water quality monitoring and grading storage system can be started in a chain manner;
the electromagnetic flowmeter (3) is used for monitoring the flow of the heavy water and is also used for the first analysis to judge whether the conductivity of the heavy water is qualified.
7. The heavy water quality monitoring and staging storage system of claim 6, wherein said first staging includes the following two conditions:
firstly, if the reading of the electromagnetic flowmeter (3) is consistent with the conveying flow of the pre-stage purification unit (1), namely the reading of the pre-stage output flow controller (2), and is stably kept, the conductivity of the heavy water is unqualified, the control terminal automatically associates the valve assembly of the pipeline path opened to the low-stage heavy water storage tank (5), and conveys the heavy water with the unqualified conductivity to the low-stage heavy water storage tank (5) for temporary storage for later treatment; meanwhile, the liquid storage amount in the low-grade heavy water storage tank (5) is determined by correlating and accumulating the conveying flow of the preceding-stage purification unit (1), namely the heavy water flow passing through the preceding-stage output flow controller (2);
secondly, if the reading fluctuation of the electromagnetic flowmeter (3) is abnormal, the conveying flow of the pre-stage purification unit (1), namely the reading of the pre-stage output flow controller (2), is stable, the conductivity of the heavy water is qualified, and the control terminal automatically associates the valve assembly opening the path to the heavy water concentration online analysis unit, conveys the heavy water with qualified conductivity to the heavy water concentration online analysis unit for further secondary analysis;
simultaneously monitoring the heavy water pressure of corresponding points on the pipeline through the pressure gauge;
in the first case, the judgment criterion that the reading of the electromagnetic flow meter (3) is consistent and stable with the reading of the preceding stage output flow controller (2) is determined by the measurement accuracy of the electromagnetic flow meter (3) and the measurement accuracy of the preceding stage output flow controller (2), when the reading of the electromagnetic flow meter (3) is consistent and stable with the reading of the preceding stage output flow controller (2), the difference between the reading of the electromagnetic flow meter (3) and the reading of the preceding stage output flow controller (2) is not higher than 5 times of the measurement accuracy of the larger one of the electromagnetic flow meter (3) and the preceding stage output flow controller (2), and the fluctuation of the reading of the electromagnetic flow meter (3) and the measurement accuracy of the electromagnetic flow meter (3) are in an order of magnitude, particularly, not more than 3 times of the measurement accuracy of the electromagnetic flow meter (3);
in the second case, the abnormal fluctuation of the reading of the electromagnetic flowmeter (3) means that the difference between the reading of the electromagnetic flowmeter (3) and the reading of the preceding stage output flow controller (2) is not less than 30 times of the measurement accuracy of the electromagnetic flowmeter (3);
in the second case, the judgment criterion for the stability of the delivery flow rate of the preceding purification unit (1) is determined by the measurement accuracy of the preceding output flow rate controller (2), and when the delivery flow rate of the preceding purification unit (1) is stable, the fluctuation of the reading of the preceding output flow rate controller (2) should be in an order of magnitude, preferably not more than 3 times the measurement accuracy of the preceding output flow rate controller (2).
8. The heavy water quality monitoring and staging storage system as claimed in claim 7, wherein: the length of the first output pipe (14) can ensure that when the first-time grading operation logic instruction is obtained, the heavy water corresponding to the analysis result of the first-time analysis does not obtain a definite grading flow direction, so that the high-grade heavy water storage tank (7) is not polluted by low-grade heavy water due to delay of the analysis result, and the low-grade heavy water refers to the heavy water with unqualified conductivity.
9. The heavy water quality monitoring and staging storage system as claimed in claim 8, wherein:
the heavy water concentration online analysis unit is used for carrying out the second analysis on the heavy water qualified in the first analysis result, carrying out the second classification on the heavy water, and distributing the heavy water to the medium-grade heavy water storage tank (6) or the high-grade heavy water storage tank (7); the second analysis refers to heavy water concentration analysis;
the heavy water with the analysis result of the heavy water concentration analysis reaching a preset heavy water concentration limit value is automatically associated with the valve assembly of the path opened to the high-grade heavy water storage tank (7) through the control terminal and is conveyed to the high-grade heavy water storage tank (7) for storage; meanwhile, the liquid storage amount in the high-grade heavy water storage tank (7) is determined by correlating and accumulating the conveying flow of the preceding-stage purification unit (1), namely the heavy water flow flowing through the preceding-stage output flow controller (2);
if the analysis result of the heavy water concentration analysis does not meet the heavy water with the preset heavy water concentration limit value, automatically associating the valve assembly of the path opened to the medium heavy water storage tank (6) through the control terminal, and conveying the valve assembly to the medium heavy water storage tank (6) for temporary storage for later treatment; meanwhile, the liquid storage amount in the middle heavy water storage tank (6) is determined by correlating and accumulating the conveying flow of the front stage purification unit (1), namely the heavy water flow passing through the front stage output flow controller (2).
10. The heavy water quality monitoring and staging storage system as claimed in claim 9, wherein: the length of the second output pipe (16) can ensure that when the second-stage operation logic instruction is obtained, the heavy water corresponding to the analysis result of the second analysis does not obtain a definite stage flow direction, so that the high-grade heavy water storage tank (7) is not polluted by low-grade heavy water due to delay of the analysis result, and the low-grade heavy water refers to the heavy water of which the analysis result of the heavy water concentration analysis does not meet a preset heavy water concentration limit value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211135917.3A CN115656275A (en) | 2022-09-19 | 2022-09-19 | Heavy water quality monitoring and hierarchical storage system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211135917.3A CN115656275A (en) | 2022-09-19 | 2022-09-19 | Heavy water quality monitoring and hierarchical storage system |
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| CN115656275A true CN115656275A (en) | 2023-01-31 |
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| CN202211135917.3A Pending CN115656275A (en) | 2022-09-19 | 2022-09-19 | Heavy water quality monitoring and hierarchical storage system |
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