CN116448824B - A comprehensive monitoring system and method for heat return water in power plants - Google Patents
A comprehensive monitoring system and method for heat return water in power plantsInfo
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- CN116448824B CN116448824B CN202310503515.2A CN202310503515A CN116448824B CN 116448824 B CN116448824 B CN 116448824B CN 202310503515 A CN202310503515 A CN 202310503515A CN 116448824 B CN116448824 B CN 116448824B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
- G01N27/08—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid which is flowing continuously
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
- G01K13/026—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow of moving liquids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention discloses a comprehensive monitoring system and method for heat supply backwater of a power plant, wherein a heat supply backwater pipeline is communicated with an inlet of a constant temperature device, an outlet of the constant temperature device is divided into two paths, one path is communicated with an inlet of a conductivity electrode through a conductivity meter sampling valve, the other path is communicated with a first opening of a three-way electromagnetic valve, a second opening of the three-way electromagnetic valve is communicated with a trench, a third opening of the three-way electromagnetic valve is divided into two paths, one path is communicated with an inlet of a hydrogen type cation exchange device through a hydrogen conductivity meter sampling valve, an outlet of the hydrogen type cation exchange device is communicated with an inlet of the hydrogen conductivity electrode, and the other path is communicated with an online chemical meter through an online chemical meter sampling valve.
Description
Technical Field
The invention belongs to the technical field of heat supply backwater quality monitoring of power plants, and relates to a comprehensive heat supply backwater monitoring system and method of a power plant.
Background
In order to promote the high-speed development of energy conservation and emission reduction of the coal-fired generator set, more and more power plants at present achieve the purposes of reducing the energy consumption of the generator set and improving the efficiency of the generator set through heat supply. With the increase of heat supply quantity, more and more heat supply units begin to recover the supplied steam so as to reduce the waste of water resources and the loss of residual heat. According to the water quality condition, the heat supply backwater can be supplemented to the deaerator, the condenser and the water treatment system. In order to realize cascade utilization of the heat supply backwater to the maximum extent, it is important to monitor the water quality of the heat supply backwater in real time. Among these, conductivity and hydrogen conductivity are two of the most important water quality monitoring indicators. Conductivity reflects the overall level of ionic content in water. The hydrogen conductivity is the conductivity measured after the cations in the water sample are replaced by hydrogen ions through cation exchange resin, and reflects the total level of impurity anions in the water. In addition, hardness, iron content, sodium ion, chloride ion, silicon dioxide, TOCi content and the like are also important heat supply backwater quality monitoring indexes.
However, due to the pollution, corrosion, leakage and unstable backwater of a heating pipeline, the backwater quality fluctuation is large, the running condition of an on-site on-line monitoring instrument is extremely bad, and the control mode has great limitation. The following problems mainly exist:
1) The temperature of the heat supply backwater is high and can reach 50-90 ℃, the optimal temperature for the operation of an online chemical instrument is generally 25 ℃, and the too high water temperature can cause a large measurement error. In addition, the performance of ion exchange resins at high temperatures can also be significantly reduced, thereby affecting the measurement of hydrogen conductivity.
2) The cation exchange resin for hydrogen conductivity measurement failed rapidly. When the water quality suddenly worsens, the cation exchange resin for measuring the hydrogen conductivity is rapidly failed, so that the service life of the cation exchange resin is greatly reduced, the resin is frequently replaced, the workload of field maintenance is greatly increased, a certain vacuum measuring period also occurs in the replacement process, and the continuous measurement of a water sample is not facilitated.
3) The water quality condition is judged by field personnel to determine the recovery and the removal of the heat supply backwater, so that the method has strong dependence on the field personnel, large limitation and no intellectualization.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a comprehensive monitoring system and method for heating backwater of a power plant, which can accurately measure hydrogen conductivity and prolong the service life of cation exchange resin.
The invention discloses a comprehensive monitoring system for heat supply and return water of a power plant, which comprises a heat supply and return water pipeline, a constant temperature device, a conductivity meter sample injection valve, a conductivity electrode, a three-way electromagnetic valve, a hydrogen conductivity meter sample injection valve, a hydrogen cation exchange device, a trench, a hydrogen conductivity electrode, an online chemical instrument sample injection valve, an online chemical instrument and a control system;
The heating return water pipeline is communicated with the inlet of the constant temperature device, the outlet of the constant temperature device is divided into two paths, one path is communicated with the inlet of the conductivity electrode through the conductivity meter sample injection valve, the other path is communicated with the first opening of the three-way electromagnetic valve, the second opening of the three-way electromagnetic valve is communicated with the trench, the third opening of the three-way electromagnetic valve is divided into two paths, one path is communicated with the inlet of the hydrogen type cation exchange device through the hydrogen conductivity meter sample injection valve, the outlet of the hydrogen type cation exchange device is communicated with the inlet of the hydrogen conductivity electrode, and the other path is communicated with the online chemical meter through the online chemical meter sample injection valve;
The electric conductivity electrode is connected with the electric conductivity transducer, the hydrogen electric conductivity electrode is connected with the electric conductivity transducer, the output end of the hydrogen electric conductivity transducer and the output end of the on-line chemical instrument are connected with the input end of the control system, and the output end of the control system is connected with the control end of the constant temperature device and the control end of the three-way electromagnetic valve.
The heat supply water return pipeline is communicated with the inlet of the constant temperature device through the sample injection valve and the filter.
The outlet of the conductivity electrode is communicated with the trench through a first drain pipe,
The second opening of the three-way electromagnetic valve is communicated with the trench through a second drain pipe.
The outlet of the hydrogen conductivity electrode is communicated with the trench through a third drain pipe.
The online chemical instrument is one or the combination of a plurality of hardness analyzers, all-iron analyzers, hydrogen conductivity meters, pH meters, sodium meters, silicon meters, chloride ion analyzers, TOC analyzers, TOCi analyzers and COD analyzers.
The invention discloses a comprehensive monitoring method for heat supply backwater of a power plant, which comprises the following steps:
The water sample of the heat supply backwater is regulated to a preset range by a constant temperature device, the water outlet of the constant temperature device enters a conductivity electrode after passing through a conductivity meter sample injection valve, the conductivity and temperature information of the water sample of the heat supply backwater are measured by the conductivity electrode, and then the water is sent to a control system by a conductivity transmitter;
When the measured conductivity and temperature are in the corresponding preset ranges, controlling a three-way electromagnetic valve, respectively sending the output water of the constant temperature device into a hydrogen type cation exchange device and an on-line chemical instrument, completely replacing impurity cations with hydrogen ions through the hydrogen type cation exchange device, sending the hydrogen ions into a hydrogen conductivity electrode, measuring hydrogen conductivity and temperature information in a heat supply backwater water sample through the hydrogen conductivity electrode, sending the information into a control system through a hydrogen conductivity transmitter, and simultaneously measuring parameters of the heat supply backwater water sample through the on-line chemical instrument and sending the parameters into the control system;
When the conductivity or the temperature measured by the conductivity electrode is not in the corresponding preset range, the three-way electromagnetic valve is controlled to discharge the water output by the constant temperature device to the trench.
Further comprises:
the control system compares the parameters of the heat supply backwater water sample and the hydrogen conductivity measured by the online chemical instrument with the corresponding set values to judge whether the parameters of the heat supply backwater water sample and the hydrogen conductivity are qualified, when the parameters of the heat supply backwater water sample and the hydrogen conductivity are both qualified, a prompt of suggesting recovery is displayed, and otherwise, a prompt of not suggesting recovery is displayed.
Further comprises:
When the measured temperature of the conductivity electrode is not in the corresponding preset range, the control system controls the constant temperature device so that the measured temperature of the conductivity electrode is in the corresponding preset range.
The invention has the following beneficial effects:
when the comprehensive monitoring system and method for the heat supply backwater of the power plant are specifically operated, the conductivity and the temperature information of a heat supply backwater water sample are measured through the conductivity electrode, when the measured conductivity and temperature are in the corresponding preset ranges, the water output by the constant temperature device is respectively sent into the hydrogen type cation exchange device and the on-line chemical instrument so as to accurately measure the hydrogen conductivity and the conductivity, in addition, when the conductivity or the temperature measured by the conductivity electrode is not in the corresponding preset range, the three-way electromagnetic valve is controlled, the water output by the constant temperature device is discharged to a trench, the influence on subsequent instruments is avoided, and the service life of the cation exchange resin is prolonged.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
Fig. 2 is a flow chart of the present invention.
The device comprises a sample injection valve 1, a filter 2, a constant temperature device 3, a conductivity meter sample injection valve 4, a conductivity electrode 5, a conductivity transmitter 6, a three-way electromagnetic valve 7, a hydrogen conductivity meter sample injection valve 8, a hydrogen cation exchange device 9, a hydrogen conductivity electrode 10, a hydrogen conductivity transmitter 11, an online chemical instrument sample injection valve 12, an online chemical instrument 13 and a control system 14.
Detailed Description
In order to make the present invention better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments, but not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
In the accompanying drawings, there is shown a schematic structural diagram in accordance with a disclosed embodiment of the invention. The figures are not drawn to scale, wherein certain details are exaggerated for clarity of presentation and may have been omitted. The shapes of the various regions, layers and their relative sizes, positional relationships shown in the drawings are merely exemplary, may in practice deviate due to manufacturing tolerances or technical limitations, and one skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions as actually required.
Referring to fig. 1, the comprehensive monitoring system for heating backwater of a power plant comprises a sample injection valve 1, a filter 2, a thermostat 3, a conductivity meter sample injection valve 4, a conductivity electrode 5, a conductivity transmitter 6, a three-way electromagnetic valve 7, a hydrogen conductivity meter sample injection valve 8, a hydrogen type cation exchange device 9, a hydrogen conductivity electrode 10, a hydrogen conductivity transmitter 11, other online chemical instrument sample injection valves 12, an online chemical instrument 13 and a control system 14;
The heat supply water return pipeline is communicated with the inlet of the filter 2 through the sample injection valve 1, and the outlet of the filter 2 is communicated with the inlet of the constant temperature device 3. The outlet of the constant temperature device 3 is divided into two paths, wherein one path is communicated with the inlet of the conductivity electrode 5 through the conductivity meter sampling valve 4, the outlet of the conductivity electrode 5 is communicated with a trench through a first drain pipe, the other path is communicated with the first opening of the three-way electromagnetic valve 7, the second opening of the three-way electromagnetic valve 7 is communicated with the trench through a second drain pipe, the third opening of the three-way electromagnetic valve 7 is divided into two paths, one path is communicated with the inlet of the hydrogen type cation exchange device 9 through the hydrogen conductivity meter sampling valve 8, the outlet of the hydrogen type cation exchange device 9 is communicated with the inlet of the hydrogen conductivity electrode 10, the outlet of the hydrogen conductivity electrode 10 is communicated with the trench through a third drain pipe, and the other path is communicated with the on-line chemical instrument 13 through the on-line chemical instrument sampling valve 12.
The conductivity electrode 5 is connected with the conductivity transducer 6, the hydrogen conductivity electrode 10 is connected with the hydrogen conductivity transducer 11, the output end of the conductivity transducer 6, the output end of the hydrogen conductivity transducer 11 and the output end of the on-line chemical meter 13 are connected with the input end of the control system 14, and the output end of the control system 14 is connected with the control end of the constant temperature device 3 and the control end of the three-way electromagnetic valve 7.
The online chemical instrument 13 is one or a combination of a plurality of hardness analyzers, all-iron analyzers, hydrogen conductivity meters, pH meters, sodium meters, silicon meters, chloride ion analyzers, TOC analyzers, TOCi analyzers and COD analyzers.
Referring to fig. 2, the comprehensive monitoring method for the heat supply backwater of the power plant comprises the following steps:
The heat supply backwater water sample is filtered through the filter 2 after passing through the sample injection valve 1, so that the influence of impurities in water on the follow-up measurement accuracy and service life is reduced, the water temperature is regulated to be within a preset range through the constant temperature device 3, the water outlet of the constant temperature device 3 enters the conductivity electrode 5 after passing through the conductivity meter sample injection valve 4, the conductivity and temperature information of the heat supply backwater water sample are measured through the conductivity electrode 5, and then the water outlet is sent to the control system 14 through the conductivity transmitter 6.
When the measured conductivity and temperature are in the corresponding preset ranges, the three-way electromagnetic valve 7 is controlled, the output water of the constant temperature device 3 is respectively sent to the hydrogen type cation exchange device 9 and the on-line chemical instrument 13, impurity cations are completely replaced by hydrogen ions through the hydrogen type cation exchange device 9 and then sent to the hydrogen conductivity electrode 10, the hydrogen conductivity and temperature information in the heat supply backwater water sample is measured through the hydrogen conductivity electrode 10 and sent to the control system 14 through the hydrogen conductivity transmitter 11, and meanwhile, the parameters of the heat supply backwater water sample are measured through the on-line chemical instrument 13 and sent to the control system 14.
The control system 14 compares the parameters of the hot water sample and the hydrogen conductivity detected by the on-line chemical instrument 13 with the corresponding set values to judge whether the parameters of the hot water sample and the hydrogen conductivity are qualified, when the parameters of the hot water sample and the hydrogen conductivity are qualified, a prompt of 'recommends' is displayed, and otherwise, a prompt of 'does not recommends' is displayed.
When the conductivity or temperature measured by the conductivity electrode 5 is not within the corresponding preset range, the three-way electromagnetic valve 7 is controlled to discharge the water output by the constant temperature device 3 to the trench, and a prompt of not suggesting to recover is displayed at the same time so as to protect the subsequent online chemical instrument 13.
When the temperature measured by the conductivity electrode 5 is not within the corresponding preset range, the control system 14 controls the constant temperature device 3 so that the temperature measured by the conductivity electrode 5 is within the corresponding preset range.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made to the specific embodiments of the present invention without departing from the spirit and scope of the present invention, and any modifications and equivalents are intended to be included in the scope of the claims of the present invention.
Claims (9)
1. The comprehensive monitoring system for the heat supply backwater of the power plant is characterized by comprising a heat supply backwater pipeline, a constant temperature device (3), a conductivity meter sampling valve (4), a conductivity electrode (5), a three-way electromagnetic valve (7), a hydrogen conductivity meter sampling valve (8), a hydrogen cation exchange device (9), a trench, a hydrogen conductivity electrode (10), an online chemical instrument sampling valve (12), an online chemical instrument (13) and a control system (14);
The heat supply return water pipeline is communicated with the inlet of the constant temperature device (3), the outlet of the constant temperature device (3) is divided into two paths, one path is communicated with the inlet of the conductivity electrode (5) through the conductivity meter sampling valve (4), the other path is communicated with the first opening of the three-way electromagnetic valve (7), the second opening of the three-way electromagnetic valve (7) is communicated with a trench, the third opening of the three-way electromagnetic valve (7) is divided into two paths, one path is communicated with the inlet of the hydrogen type cation exchange device (9) through the hydrogen conductivity meter sampling valve (8), the outlet of the hydrogen type cation exchange device (9) is communicated with the inlet of the hydrogen conductivity electrode (10), and the other path is communicated with the online chemical instrument (13) through the online chemical instrument sampling valve (12);
The conductivity electrode (5) is connected with the conductivity transmitter (6), the hydrogen conductivity electrode (10) is connected with the hydrogen conductivity transmitter (11), the output end of the conductivity transmitter (6), the output end of the hydrogen conductivity transmitter (11) and the output end of the on-line chemical instrument (13) are connected with the input end of the control system (14), and the output end of the control system (14) is connected with the control end of the constant temperature device (3) and the control end of the three-way electromagnetic valve (7).
2. The power plant heating backwater integrated monitoring system according to claim 1, wherein the heating backwater pipeline is communicated with the inlet of the constant temperature device (3) through the sample injection valve (1) and the filter (2).
3. The power plant heating backwater integrated monitoring system according to claim 1, wherein the outlet of the conductivity electrode (5) is communicated with the trench through a first drain pipe.
4. The power plant heating backwater integrated monitoring system according to claim 1, wherein the second opening of the three-way electromagnetic valve (7) is communicated with the trench through a second drain pipe.
5. The power plant heating return water integrated monitoring system according to claim 1, wherein the outlet of the hydrogen conductivity electrode (10) is in communication with the trench through a third drain pipe.
6. The system for comprehensively monitoring heat supply and return water of power plant according to claim 1, wherein the on-line chemical instrument (13) is one or a combination of several of a hardness analyzer, a total iron analyzer, a hydrogen conductivity meter, a pH meter, a sodium meter, a silicon meter, a chloride ion analyzer, a TOC analyzer, a TOCi analyzer and a COD analyzer.
7. A method for comprehensively monitoring heat supply backwater of a power plant, which is characterized by comprising the following steps based on the system for comprehensively monitoring heat supply backwater of the power plant as claimed in claim 1:
The water sample of the heat supply backwater is regulated to a preset range through a constant temperature device (3), the water outlet of the constant temperature device (3) enters a conductivity electrode (5) after passing through a conductivity meter sample injection valve (4), the conductivity and temperature information of the water sample of the heat supply backwater are measured through the conductivity electrode (5), and then the water is sent to a control system (14) through a conductivity transmitter (6);
When the measured conductivity and temperature are in the corresponding preset ranges, controlling a three-way electromagnetic valve (7), respectively sending the output water of a constant temperature device (3) into a hydrogen type cation exchange device (9) and an online chemical instrument (13), completely replacing impurity cations with hydrogen ions through the hydrogen type cation exchange device (9), sending the hydrogen ions into a hydrogen conductivity electrode (10), measuring hydrogen conductivity and temperature information in a heat supply backwater water sample through the hydrogen conductivity electrode (10), sending the hydrogen conductivity and temperature information into a control system (14) through a hydrogen conductivity transmitter (11), and simultaneously measuring parameters of the heat supply backwater water sample through the online chemical instrument (13) and sending the parameters into the control system (14);
when the conductivity or the temperature measured by the conductivity electrode (5) is not in the corresponding preset range, the three-way electromagnetic valve (7) is controlled, and the water output by the constant temperature device (3) is discharged to a trench.
8. The method for comprehensively monitoring heating return water of a power plant according to claim 7, further comprising:
the control system (14) compares the parameters of the heat supply backwater water sample and the hydrogen conductivity detected by the online chemical instrument (13) with the corresponding set values to judge whether the parameters of the heat supply backwater water sample and the hydrogen conductivity detected are qualified, when the parameters of the heat supply backwater water sample and the hydrogen conductivity detected are both qualified, a prompt for suggesting recovery is displayed, and otherwise, a prompt for not suggesting recovery is displayed.
9. The method for comprehensively monitoring heating return water of a power plant according to claim 7, further comprising:
when the measured temperature of the conductivity electrode (5) is not within the corresponding preset range, the control system (14) controls the constant temperature device (3) so that the measured temperature of the conductivity electrode (5) is within the corresponding preset range.
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| CN202310503515.2A CN116448824B (en) | 2023-04-28 | 2023-04-28 | A comprehensive monitoring system and method for heat return water in power plants |
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| CN120177572B (en) * | 2025-03-20 | 2025-11-21 | 华电电力科学研究院有限公司 | A diagnostic system and method for excessive hydrogen conductivity in condensed water |
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|---|---|---|---|---|
| AT311609B (en) * | 1968-11-13 | 1973-11-26 | Centra Buerkle Kg Albert | Three-way mixer |
| CN104787766A (en) * | 2014-01-16 | 2015-07-22 | 新特能源股份有限公司 | Heat energy utilization method and heat energy utilization system in polycrystalline silicon production |
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