CN117664449A - Generator constant-cooling water dissolved hydrogen detection method and system based on trace magnitude - Google Patents
Generator constant-cooling water dissolved hydrogen detection method and system based on trace magnitude Download PDFInfo
- Publication number
- CN117664449A CN117664449A CN202311648560.3A CN202311648560A CN117664449A CN 117664449 A CN117664449 A CN 117664449A CN 202311648560 A CN202311648560 A CN 202311648560A CN 117664449 A CN117664449 A CN 117664449A
- Authority
- CN
- China
- Prior art keywords
- concentration
- dissolved hydrogen
- hydrogen
- water
- deviation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000001257 hydrogen Substances 0.000 title claims abstract description 187
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 187
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 181
- 239000000498 cooling water Substances 0.000 title claims abstract description 19
- 238000001514 detection method Methods 0.000 title claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 162
- 238000012544 monitoring process Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000012546 transfer Methods 0.000 claims description 26
- 239000007788 liquid Substances 0.000 claims description 16
- 238000004364 calculation method Methods 0.000 claims description 15
- 238000012937 correction Methods 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 15
- 230000008859 change Effects 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
- 150000002431 hydrogen Chemical class 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 230000004044 response Effects 0.000 claims description 6
- 239000012159 carrier gas Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000003745 diagnosis Methods 0.000 claims description 3
- 238000012806 monitoring device Methods 0.000 claims description 3
- 238000013139 quantization Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 abstract description 2
- 239000001301 oxygen Substances 0.000 abstract description 2
- 229910052760 oxygen Inorganic materials 0.000 abstract description 2
- 230000001502 supplementing effect Effects 0.000 abstract description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 229910000431 copper oxide Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- 239000005751 Copper oxide Substances 0.000 description 1
- 230000005526 G1 to G0 transition Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- BERDEBHAJNAUOM-UHFFFAOYSA-N copper(I) oxide Inorganic materials [Cu]O[Cu] BERDEBHAJNAUOM-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- KRFJLUBVMFXRPN-UHFFFAOYSA-N cuprous oxide Chemical compound [O-2].[Cu+].[Cu+] KRFJLUBVMFXRPN-UHFFFAOYSA-N 0.000 description 1
- 229940112669 cuprous oxide Drugs 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Landscapes
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The invention relates to a trace-magnitude-based method and a trace-magnitude-based system for detecting dissolved hydrogen in cold water of a generator, and belongs to the technical field of cold water hydrogen leakage monitoring. Wherein the method comprises the following steps: obtaining the concentration of dissolved hydrogen at the water inlet and the concentration of dissolved hydrogen at the water outlet; establishing a deviation control model through the concentration of the dissolved hydrogen at the water inlet and the concentration of the dissolved hydrogen at the water outlet to obtain a control output variable; sending a control signal to the regulator according to the control output variable, and correcting deviation of the concentration of the dissolved hydrogen at the water inlet and the concentration of the dissolved hydrogen at the water outlet; adding a time step representation for the dissolved hydrogen concentration data, and calculating the difference value between the dissolved hydrogen concentration of the water inlet and the dissolved hydrogen concentration of the water outlet at the same time step through a diagnostor to obtain the hydrogen leakage; and monitoring a generator constant cooling water tank in real time, counting the hour hydrogen leakage and the day hydrogen leakage, and judging whether the hydrogen leakage exceeds a safety threshold. The trace measurement of dissolved hydrogen in the constant-cooling water is realized, and the interferences of water tank water draining and supplementing, air exhausting, dissolved oxygen in water, temperature and pressure are avoided.
Description
Technical Field
The invention belongs to the technical field of hydrogen leakage monitoring of a constant-cooling water tank, and particularly relates to a method and a system for detecting dissolved hydrogen of constant-cooling water of a generator based on trace level.
Background
Because the leakage defects of the inner wire rod and the water and electricity joint of the generator set are caused by aging, corrosion, vibration and temperature change, contact resistance is generated, heating is carried out under high current, leakage points are further expanded under the action of heat, larger contact resistance is generated, and finally, the generator is burnt due to the fact that the generator is instantaneously heated; because hydrogen leaks into the cold water, copper oxide is reduced into elemental copper and cuprous oxide, the reduced copper can form uneven copper plating phenomenon at the narrow place of the hollow wire, so that the through flow of the hollow wire is reduced, the area is reduced, the flow is reduced, the temperature is increased, the unit is forced to run only under the load, and the hollow wire is blocked when serious, so that the wire rod is burnt and stopped. The leakage condition of the generator cooling water system is monitored, so that the safe operation of the generator is ensured.
There are still the following areas to be improved:
(1) The concentration of the hydrogen gathered at the upper part of the water tank is monitored, the measuring range of the alarm instrument is a percentage concentration value, the explosion-proof effect is mainly achieved, and the tiny leakage cannot be monitored. The hydrogen concentration at the top of the water tank can be accurately measured only when the percentage concentration is reached, when the exhaust valve is closed, the hydrogen concentration can be slowly enriched and is higher and higher, but the upper part of the water tank is positive pressure, the hydrogen volume is inaccurately measured, the instrument accuracy is low, the hydrogen leakage in the cold water cannot be truly reflected, the hydrogen leakage can be measured by adopting the hydrogen supplementing quantity, and the water-electricity interface leakage condition cannot be illustrated.
(2) The wind pressure and the water pressure test adopt a pressure drop mode, and only larger leakage can be detected by the image of the accuracy of the pressure gauge, so that the test period is long; however, when the leakage is very small, the wind pressure and the water pressure test are qualified, but the operation of the generator with defects is still caused, and a great potential safety hazard exists.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method and a system for detecting the dissolved hydrogen of the cold water of the generator based on trace level,
the aim of the invention can be achieved by the following technical scheme:
s1: acquiring a generator chilled water inlet water sample and an outlet water sample through an ion exchanger, conveying the inlet water sample and the outlet water sample to a gas-liquid separator for gas-liquid separation to obtain a hydrogen sample, and conveying the hydrogen sample to a gas chromatograph through a gas circuit system to obtain water inlet dissolved hydrogen concentration and water outlet dissolved hydrogen concentration;
s2: establishing a deviation control model through the concentration of the dissolved hydrogen in the water inlet and the concentration of the dissolved hydrogen in the water outlet, and obtaining a control output variable according to the deviation control model;
s3: sending a control signal to a regulator according to the control output variable, analyzing the control signal in the regulator, sending execution information to the controller, regulating the feeding amount of a fixed cold water inlet according to the execution information, and carrying out deviation correction on the dissolved hydrogen concentration of the water inlet and the dissolved hydrogen concentration of the water outlet according to the dissolved hydrogen concentration of the measured feeding amount;
s4: recording the concentration of dissolved hydrogen at a water inlet and the concentration of dissolved hydrogen at a water outlet of a generator through a recorder, uploading the concentration data of the dissolved hydrogen to a monitoring system storage module through a data serial port, adding time step representations for the concentration data of the dissolved hydrogen, and calculating the difference value of the concentration of the dissolved hydrogen at the water inlet and the concentration of the dissolved hydrogen at the water outlet at the same time step through a diagnostor to obtain the hydrogen leakage quantity;
s5: and the storage data of the monitoring system are updated in real time through the real-time monitoring of the generator constant-cooling water tank, the hour hydrogen leakage amount and the daily hydrogen leakage amount are counted, if the hydrogen leakage amount exceeds a safety threshold, safety alarm information is sent out, emergency shutdown response is carried out, and if the hydrogen leakage amount does not exceed the safety threshold, the normal operation of the system is maintained.
Specifically, the step S1 includes:
sampling the inlet and the outlet of the generator fixed-cooling water tank through a monitoring device to obtain an inlet water sample and an outlet water sample; and discharging the inlet water sample and the outlet water sample into a rectifying tower to obtain a high-boiling-point component and a low-boiling-point component, discharging the low-boiling-point component through a condenser to obtain a hydrogen sample, concentrating the high-boiling-point component, and heating the high-boiling-point component through a reboiler and returning the high-boiling-point component into the rectifying tower. And carrying the hydrogen sample into a chromatographic column by carrier gas for operation, determining the height of a column plate by analyzing the column effect of the chromatographic column, and calculating the concentration of dissolved hydrogen according to the height of the column plate.
Further, the step S2 includes the steps of:
obtaining concentration deviation through the concentration of the dissolved hydrogen at the water inlet and the concentration of the dissolved hydrogen at the water outlet, obtaining an initial transfer function according to the deviation, and calculating the initial transfer function according to the calculation formula:
wherein G is 1 For initial transfer function, r is water resistance in top cold water tank, k is quantization factor, u is concentration control quantity, s is deviation, T 1 Is the cross-sectional area of the water inlet, T 2 Is the cross-sectional area of the water outlet;
obtaining a corrected transfer function according to the hysteresis of the dissolved hydrogen concentration detection time, and obtaining a deviation control model through the initial transfer function and the corrected transfer function:
and taking the concentration deviation and the change rate of the concentration deviation as input variables, and obtaining the control output variables through the deviation control model.
Specifically, the correction transfer function is modeling of concentration deviation in a time dimension, hysteresis prediction duration is preset, a nonlinear dependency relationship between a predicted variable and a hysteresis variable is parameterized through a regression model to obtain an exposure vector, the correction transfer function is constructed according to the exposure vector, and a calculation formula is as follows:
wherein G is 2 For correction transfer function, s is the bias base variable, U is the hysteresis dimension, K is the hysteresis variable, e is the natural number, and w is the exposure vector parameter.
Specifically, the control output variable calculation method is as follows:
taking the deviation of the concentration and the deviation change rate as input variables of the deviation control model, dividing the input variables to obtain input components, and calculating the membership degree of the input components through a membership degree function, wherein a calculation formula is as follows:
wherein O is i For membership, i is the input component count, e is the natural number, x i C as input component i The sigma is the width of the membership function;
presetting a constraint rule, calculating the fitness of the constraint rule according to the membership degree, obtaining a control output variable through the gain of a control parameter by the fitness, and obtaining a calculation formula:
wherein u is a control output variable, t is a time variable, and w p Is a proportional gain parameter, w i To integrate the gain parameter, w d Is a differential gain parameter.
Specifically, the temperature of the two sides of the constant-temperature water tank is constant to the same temperature when the diagnostic device measures, the dissolved hydrogen concentration of the water sample at the inlet and the outlet of the constant-temperature water tank of the generator is measured in real time under standard pressure, and the hour hydrogen leakage and the day hydrogen leakage are calculated.
The generator constant-cooling water dissolved hydrogen detection system based on trace magnitude is characterized by comprising a data acquisition module, a deviation prediction module, a calibration module, a storage analysis module and an early warning module;
the data acquisition module is used for acquiring a generator chilled water inlet water sample and an outlet water sample, conveying the inlet water sample and the outlet water sample to a gas-liquid separator for gas-liquid separation to obtain a hydrogen sample, and conveying the hydrogen sample to the gas chromatograph through a gas circuit system to obtain water inlet dissolved hydrogen concentration and water outlet dissolved hydrogen concentration;
the deviation prediction module is used for establishing a deviation control model, and obtaining a control output variable according to the deviation control model;
the calibration module is used for sending a control signal to a regulator according to the control output variable, analyzing the control signal in the regulator and sending execution information to the controller, regulating the feeding amount of the fixed cold water inlet through the execution information, and carrying out deviation correction on the dissolved hydrogen concentration of the water inlet and the dissolved hydrogen concentration of the water outlet according to the dissolved hydrogen concentration of the measured feeding amount;
the storage analysis module is used for recording the concentration of dissolved hydrogen at the water inlet and the concentration of dissolved hydrogen at the water outlet of the generator, uploading the concentration data of the dissolved hydrogen to the monitoring system storage module through a data serial port, adding time step representation for the concentration data of the dissolved hydrogen, and calculating the difference value between the concentration of the dissolved hydrogen at the water inlet and the concentration of the dissolved hydrogen at the water outlet at the same time step through the diagnostor to obtain the hydrogen leakage quantity;
the early warning module is used for updating the stored data of the monitoring system in real time, counting the hour hydrogen leakage amount and the day hydrogen leakage amount, judging whether the hydrogen leakage amount exceeds a safety threshold, if yes, sending out safety alarm information and carrying out emergency shutdown response, and if no, keeping the system to normally operate.
Specifically, the early warning module comprises a diagnostor, a controller and a regulator; the diagnosis device divides the hydrogen leakage into three conditions of normal, alarm and serious, the controller remotely controls the power generator set to switch on and off, and the regulator regulates the temperature and pressure in the cooling water tank of the power generator set.
As a preferable technical scheme of the invention, the invention has the beneficial effects that:
(1) The hydrogen leakage condition is rapidly captured by directly measuring the concentration of the dissolved hydrogen in the constant cold water, the hydrogen leakage quantity is calculated by adopting the difference value of the concentration of the dissolved hydrogen in the water sample at the inlet and the outlet of the constant cold water of the generator, the interference of water level change of a water tank, water temperature, exhaust, protective gas, body hydrogen in water and dissolved oxygen in water is avoided, and the measurement result is more accurate.
(2) The method has the advantages that the hour hydrogen leakage and the daily hydrogen leakage of the generator set are accurately calculated, in addition, a real-time online change trend chart of the hydrogen leakage concentration is formed, the potential risk of tiny leakage of the water-gas interface of the generator is monitored in real time, and a basis is provided for safe, economical operation and state maintenance of the generator set.
Drawings
The present invention is further described below with reference to the accompanying drawings for the convenience of understanding by those skilled in the art.
FIG. 1 is a schematic flow chart of a method and a system for detecting cold water dissolved hydrogen of a generator based on trace level.
Detailed Description
In order to further describe the technical means and effects adopted by the invention for achieving the preset aim, the following detailed description is given below of the specific implementation, structure, characteristics and effects according to the invention with reference to the attached drawings and the preferred embodiment.
Referring to fig. 1, a trace-level-based method and system for detecting dissolved hydrogen in cold water of a generator are realized by the following technical scheme:
s1: acquiring a generator chilled water inlet water sample and an outlet water sample through an ion exchanger, conveying the inlet water sample and the outlet water sample to a gas-liquid separator for gas-liquid separation to obtain a hydrogen sample, and conveying the hydrogen sample to a gas chromatograph through a gas circuit system to obtain water inlet dissolved hydrogen concentration and water outlet dissolved hydrogen concentration;
s2: establishing a deviation control model through the concentration of the dissolved hydrogen in the water inlet and the concentration of the dissolved hydrogen in the water outlet, and obtaining a control output variable according to the deviation control model;
s3: sending a control signal to a regulator according to the control output variable, analyzing the control signal in the regulator, sending execution information to the controller, regulating the feeding amount of a fixed cold water inlet according to the execution information, and carrying out deviation correction on the dissolved hydrogen concentration of the water inlet and the dissolved hydrogen concentration of the water outlet according to the dissolved hydrogen concentration of the measured feeding amount;
s4: recording the concentration of dissolved hydrogen at a water inlet and the concentration of dissolved hydrogen at a water outlet of a generator through a recorder, uploading the concentration data of the dissolved hydrogen to a monitoring system storage module through a data serial port, adding time step representations for the concentration data of the dissolved hydrogen, and calculating the difference value of the concentration of the dissolved hydrogen at the water inlet and the concentration of the dissolved hydrogen at the water outlet at the same time step through a diagnostor to obtain the hydrogen leakage quantity;
s5: and the storage data of the monitoring system are updated in real time through the real-time monitoring of the generator constant-cooling water tank, the hour hydrogen leakage amount and the daily hydrogen leakage amount are counted, if the hydrogen leakage amount exceeds a safety threshold, safety alarm information is sent out, emergency shutdown response is carried out, and if the hydrogen leakage amount does not exceed the safety threshold, the normal operation of the system is maintained.
Specifically, the step S1 includes:
sampling the inlet and the outlet of the generator fixed-cooling water tank through a monitoring device to obtain an inlet water sample and an outlet water sample; and discharging the inlet water sample and the outlet water sample into a rectifying tower to obtain a high-boiling-point component and a low-boiling-point component, discharging the low-boiling-point component through a condenser to obtain a hydrogen sample, concentrating the high-boiling-point component, and heating the high-boiling-point component through a reboiler and returning the high-boiling-point component into the rectifying tower. And carrying the hydrogen sample into a chromatographic column by carrier gas for operation, determining the height of a column plate by analyzing the column effect of the chromatographic column, and calculating the concentration of dissolved hydrogen according to the height of the column plate.
In this example, the components with different boiling points are separated by multiple times of partial vaporization and partial condensation, and finally the high purity component is obtained. The main equipment comprises a rectifying tower, a reboiler and a condenser. The inlet of the rectifying tower is taken as a boundary, the upper part is a rectifying section, and the lower part is a stripping section. After a mixture with certain temperature and pressure enters a rectifying tower, low-boiling-point components are gradually concentrated in a rectifying section and flow to the top of the tower, and are all condensed into liquid after leaving the top of the tower, wherein one part of the liquid is discharged as condensate, and the other part of the liquid flows back into the tower to supplement the low-boiling-point components, so that continuous and stable rectification is ensured; the high boiling point component is partially discharged after being concentrated in the stripping section, and the other part is sent back to the tower after being heated by the reboiler, so as to provide a certain amount of continuously rising gas phase for rectification; calculating the separation degree by utilizing the difference of distribution coefficients of each component in the sample between two phases in the chromatographic column; the stationary phase is composed of various chromatographic carriers, stationary liquid or various adsorbents and other granular substances. When the gaseous sample is carried into the chromatographic column by the carrier gas, the components are repeatedly distributed between two phases, and the components have different running speeds in the chromatographic column due to different adsorption or dissolution capacities of the fixed relative components and different retention effects, and are separated from each other after a certain column length, so that the components flow out of the fixed phase in sequence. The chromatographic peak is obtained by the signal obtained when the substance in the carrier gas passes through the detector and the relation curve of time, and the ratio of the difference of the distances between adjacent chromatographic peaks to the wide average value is taken as 1.5 to be used as a mark of complete separation.
Further, the step S2 includes the steps of:
obtaining concentration deviation through the concentration of the dissolved hydrogen at the water inlet and the concentration of the dissolved hydrogen at the water outlet, obtaining an initial transfer function according to the deviation, and calculating the initial transfer function according to the calculation formula:
wherein G is 1 For initial transfer function, r is water resistance in top cold water tank, k is quantization factor, u is concentration control quantity, s is deviation, T 1 Is the cross-sectional area of the water inlet, T 2 Is the cross-sectional area of the water outlet;
obtaining a corrected transfer function according to the hysteresis of the dissolved hydrogen concentration detection time, and obtaining a deviation control model through the initial transfer function and the corrected transfer function:
and taking the concentration deviation and the change rate of the concentration deviation as input variables, and obtaining the control output variables through the deviation control model.
Specifically, the correction transfer function is modeling of concentration deviation in a time dimension, hysteresis prediction duration is preset, a nonlinear dependency relationship between a predicted variable and a hysteresis variable is parameterized through a regression model to obtain an exposure vector, the correction transfer function is constructed according to the exposure vector, and a calculation formula is as follows:
wherein G is 2 For correction transfer function, s is the bias base variable, U is the hysteresis dimension, K is the hysteresis variable, e is the natural number, and w is the exposure vector parameter.
Specifically, the control output variable calculation method is as follows:
taking the deviation of the concentration and the deviation change rate as input variables of the deviation control model, dividing the input variables to obtain input components, and calculating the membership degree of the input components through a membership degree function, wherein a calculation formula is as follows:
wherein O is i For membership, i is the input component count, e is the natural number, x i C as input component i The sigma is the width of the membership function;
presetting a constraint rule, calculating the fitness of the constraint rule according to the membership degree, obtaining a control output variable through the gain of a control parameter by the fitness, and obtaining a calculation formula:
wherein u is a control output variable, t is a time variable, and w p Is a proportional gain parameter, w i To integrate the gain parameter, w d Is a differential gain parameter.
In the embodiment, a System Function in a Simulink tool box is adopted to build a model of a dissolved hydrogen concentration control System. According to the formula, creating an S-Function source code, selecting M files to write the S-Function, and setting the module adoption rate to be 1. And importing the created S-Function module into a simulation model of the dissolved hydrogen concentration, and simultaneously creating the simulation model of the dissolved hydrogen concentration based on fuzzy PID control and PID control as comparison.
Specifically, the temperature of the two sides of the constant-temperature water tank is constant to the same temperature when the diagnostic device measures, the dissolved hydrogen concentration of the water sample at the inlet and the outlet of the constant-temperature water tank of the generator is measured in real time under standard pressure, and the hour hydrogen leakage and the day hydrogen leakage are calculated.
The generator constant-cooling water dissolved hydrogen detection system based on trace magnitude is characterized by comprising a data acquisition module, a deviation prediction module, a calibration module, a storage analysis module and an early warning module;
the data acquisition module is used for acquiring a generator chilled water inlet water sample and an outlet water sample, conveying the inlet water sample and the outlet water sample to a gas-liquid separator for gas-liquid separation to obtain a hydrogen sample, and conveying the hydrogen sample to the gas chromatograph through a gas circuit system to obtain water inlet dissolved hydrogen concentration and water outlet dissolved hydrogen concentration;
the deviation prediction module is used for establishing a deviation control model, and obtaining a control output variable according to the deviation control model;
the calibration module is used for sending a control signal to a regulator according to the control output variable, analyzing the control signal in the regulator and sending execution information to the controller, regulating the feeding amount of the fixed cold water inlet through the execution information, and carrying out deviation correction on the dissolved hydrogen concentration of the water inlet and the dissolved hydrogen concentration of the water outlet according to the dissolved hydrogen concentration of the measured feeding amount;
the storage analysis module is used for recording the concentration of dissolved hydrogen at the water inlet and the concentration of dissolved hydrogen at the water outlet of the generator, uploading the concentration data of the dissolved hydrogen to the monitoring system storage module through a data serial port, adding time step representation for the concentration data of the dissolved hydrogen, and calculating the difference value between the concentration of the dissolved hydrogen at the water inlet and the concentration of the dissolved hydrogen at the water outlet at the same time step through the diagnostor to obtain the hydrogen leakage quantity;
the early warning module is used for updating the stored data of the monitoring system in real time, counting the hour hydrogen leakage amount and the day hydrogen leakage amount, judging whether the hydrogen leakage amount exceeds a safety threshold, if yes, sending out safety alarm information and carrying out emergency shutdown response, and if no, keeping the system to normally operate.
Specifically, the early warning module comprises a diagnostor, a controller and a regulator; the diagnosis device divides the hydrogen leakage into three conditions of normal, alarm and serious, the controller remotely controls the power generator set to switch on and off, and the regulator regulates the temperature and pressure in the cooling water tank of the power generator set.
The present invention is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present invention.
Claims (8)
1. The method for detecting the cold water dissolved hydrogen of the generator based on trace level is characterized by comprising the following steps of:
s1: acquiring a generator chilled water inlet water sample and an outlet water sample through an ion exchanger, conveying the inlet water sample and the outlet water sample to a gas-liquid separator for gas-liquid separation to obtain a hydrogen sample, and conveying the hydrogen sample to a gas chromatograph through a gas circuit system to obtain water inlet dissolved hydrogen concentration and water outlet dissolved hydrogen concentration;
s2: establishing a deviation control model through the concentration of the dissolved hydrogen in the water inlet and the concentration of the dissolved hydrogen in the water outlet, and obtaining a control output variable according to the deviation control model;
s3: sending a control signal to a regulator according to the control output variable, analyzing the control signal in the regulator, sending execution information to the controller, regulating the feeding amount of a fixed cold water inlet according to the execution information, and carrying out deviation correction on the dissolved hydrogen concentration of the water inlet and the dissolved hydrogen concentration of the water outlet according to the dissolved hydrogen concentration of the measured feeding amount;
s4: recording the concentration of dissolved hydrogen at a water inlet and the concentration of dissolved hydrogen at a water outlet of a generator through a recorder, uploading the concentration data of the dissolved hydrogen to a monitoring system storage module through a data serial port, adding time step representations for the concentration data of the dissolved hydrogen, and calculating the difference value of the concentration of the dissolved hydrogen at the water inlet and the concentration of the dissolved hydrogen at the water outlet at the same time step through a diagnostor to obtain the hydrogen leakage quantity;
s5: and the storage data of the monitoring system are updated in real time through the real-time monitoring of the generator constant-cooling water tank, the hour hydrogen leakage amount and the daily hydrogen leakage amount are counted, if the hydrogen leakage amount exceeds a safety threshold, safety alarm information is sent out, emergency shutdown response is carried out, and if the hydrogen leakage amount does not exceed the safety threshold, the normal operation of the system is maintained.
2. The method according to claim 1, wherein the step S1 comprises the steps of:
sampling the inlet and the outlet of the generator fixed-cooling water tank through a monitoring device to obtain an inlet water sample and an outlet water sample; discharging the inlet water sample and the outlet water sample into a rectifying tower to obtain a high-boiling-point component and a low-boiling-point component, discharging the low-boiling-point component through a condenser to obtain a hydrogen sample, concentrating the high-boiling-point component, and heating the high-boiling-point component through a reboiler and returning the high-boiling-point component into the rectifying tower; and carrying the hydrogen sample into a chromatographic column by carrier gas for operation, determining the height of a column plate by analyzing the column effect of the chromatographic column, and calculating the concentration of dissolved hydrogen according to the height of the column plate.
3. The method according to claim 1, wherein the step S2 comprises the steps of:
obtaining concentration deviation through the concentration of the dissolved hydrogen at the water inlet and the concentration of the dissolved hydrogen at the water outlet, obtaining an initial transfer function according to the deviation, and calculating the initial transfer function according to the calculation formula:
wherein G is 1 R is the water resistance in the top cold water tank, k is the quantization factor,u is the concentration control quantity, s is the deviation, T 1 Is the cross-sectional area of the water inlet, T 2 Is the cross-sectional area of the water outlet;
obtaining a corrected transfer function according to the hysteresis of the dissolved hydrogen concentration detection time, and obtaining a deviation control model through the initial transfer function and the corrected transfer function:
and taking the concentration deviation and the change rate of the concentration deviation as input variables, and obtaining the control output variables through the deviation control model.
4. The method according to claim 3, wherein the correction transfer function is modeled for concentration deviation in a time dimension, a hysteresis prediction duration is preset, a nonlinear dependency relationship between a predicted variable and a hysteresis variable is parameterized by a regression model to obtain an exposure vector, the correction transfer function is constructed according to the exposure vector, and a calculation formula is:
wherein G is 2 For correction transfer function, s is the bias base variable, U is the hysteresis dimension, K is the hysteresis variable, e is the natural number, and w is the exposure vector parameter.
5. The detection method according to claim 1, wherein the control output variable calculation method is:
taking the deviation of the concentration and the deviation change rate as input variables of the deviation control model, dividing the input variables to obtain input components, and calculating the membership degree of the input components through a membership degree function, wherein a calculation formula is as follows:
wherein O is i For membership, i is the input component countE is a natural number, x i C as input component i The sigma is the width of the membership function;
presetting a constraint rule, calculating the fitness of the constraint rule according to the membership degree, obtaining a control output variable through the gain of a control parameter by the fitness, and obtaining a calculation formula:
wherein u is a control output variable, t is a time variable, and w p Is a proportional gain parameter, w i To integrate the gain parameter, w d Is a differential gain parameter.
6. The detection method according to claim 1, wherein the diagnostic device measures the temperature of both sides of the constant cold water tank to the same temperature, measures the dissolved hydrogen concentration of the water sample at the inlet and the outlet of the constant cold water of the generator in real time under the standard pressure, and calculates the hour hydrogen leakage amount and the day hydrogen leakage amount.
7. The generator constant-cooling water dissolved hydrogen detection system based on trace magnitude is characterized by comprising a data acquisition module, a deviation prediction module, a calibration module, a storage analysis module and an early warning module;
the data acquisition module is used for acquiring a generator chilled water inlet water sample and an outlet water sample, conveying the inlet water sample and the outlet water sample to a gas-liquid separator for gas-liquid separation to obtain a hydrogen sample, and conveying the hydrogen sample to the gas chromatograph through a gas circuit system to obtain water inlet dissolved hydrogen concentration and water outlet dissolved hydrogen concentration;
the deviation prediction module is used for establishing a deviation control model, and obtaining a control output variable according to the deviation control model;
the calibration module is used for sending a control signal to a regulator according to the control output variable, analyzing the control signal in the regulator and sending execution information to the controller, regulating the feeding amount of the fixed cold water inlet through the execution information, and carrying out deviation correction on the dissolved hydrogen concentration of the water inlet and the dissolved hydrogen concentration of the water outlet according to the dissolved hydrogen concentration of the measured feeding amount;
the storage analysis module is used for recording the concentration of dissolved hydrogen at the water inlet and the concentration of dissolved hydrogen at the water outlet of the generator, uploading the concentration data of the dissolved hydrogen to the monitoring system storage module through a data serial port, adding time step representation for the concentration data of the dissolved hydrogen, and calculating the difference value between the concentration of the dissolved hydrogen at the water inlet and the concentration of the dissolved hydrogen at the water outlet at the same time step through the diagnostor to obtain the hydrogen leakage quantity;
the early warning module is used for updating the stored data of the monitoring system in real time, counting the hour hydrogen leakage amount and the day hydrogen leakage amount, judging whether the hydrogen leakage amount exceeds a safety threshold, if yes, sending out safety alarm information and carrying out emergency shutdown response, and if no, keeping the system to normally operate.
8. The system of claim 7, wherein the early warning module comprises a diagnostic, a controller, a regulator; the diagnosis device divides the hydrogen leakage into three conditions of normal, alarm and serious, the controller remotely controls the power generator set to switch on and off, and the regulator regulates the temperature and pressure in the cooling water tank of the power generator set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311648560.3A CN117664449A (en) | 2023-12-05 | 2023-12-05 | Generator constant-cooling water dissolved hydrogen detection method and system based on trace magnitude |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311648560.3A CN117664449A (en) | 2023-12-05 | 2023-12-05 | Generator constant-cooling water dissolved hydrogen detection method and system based on trace magnitude |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117664449A true CN117664449A (en) | 2024-03-08 |
Family
ID=90063592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311648560.3A Withdrawn CN117664449A (en) | 2023-12-05 | 2023-12-05 | Generator constant-cooling water dissolved hydrogen detection method and system based on trace magnitude |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117664449A (en) |
-
2023
- 2023-12-05 CN CN202311648560.3A patent/CN117664449A/en not_active Withdrawn
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4801551A (en) | Rugged dissolved carbon dioxide monitor for high purity water | |
| Benham et al. | Experimental determination of absorption-desorption isotherms by computer-controlled gravimetric analysis | |
| US4069018A (en) | Explosive gas monitoring method and apparatus | |
| CN115330000B (en) | Intelligent monitoring management system for operation of industrial automation control instrument | |
| JP3282586B2 (en) | Odor measurement device | |
| AU2020102518A4 (en) | A method of gas sensor calibration based on linear optimization | |
| CN112540150A (en) | Sensor performance evaluation device, method and system | |
| CN102778445B (en) | Intelligent analyzer and detection method for standard state dry basis | |
| CN110052050B (en) | Tower plate temperature-based internal thermally coupled rectifying tower global state observer and method | |
| CN111142494A (en) | Intelligent control method and system for amine liquid regeneration device | |
| CN117664449A (en) | Generator constant-cooling water dissolved hydrogen detection method and system based on trace magnitude | |
| CN110781611A (en) | Photovoltaic module temperature real-time calculation method based on Lambert W function | |
| CN1777803B (en) | Hydrogen sulfide monitoring system | |
| CN101839878A (en) | Method and device for analyzing trace gaseous impurities in high-purity gas (or electron gas) | |
| CN109932278B (en) | System and method for measuring gas-phase residence time distribution of fixed bed reactor | |
| CN201622258U (en) | Automatic oil gas concentration detector | |
| CN111256790A (en) | High-temperature flow testing method and device for flow metering device or atmospheric sampling equipment | |
| CN202794032U (en) | Standard state dry basis intelligent analyzer | |
| RU2314147C2 (en) | Distillation tower operation control and monitoring method | |
| EP0122248B1 (en) | A method for analysing gases | |
| Morsi | A microcontroller based on multi sensors data fusion and artificial intelligent technique for gas identification | |
| CN117744890B (en) | Human-occupied environment monitoring and optimizing method | |
| CN103674139A (en) | Two-phase flow measurement method based on mass flowmeter parametric statistical characteristics | |
| CN111983149B (en) | Multipoint type ambient air monitoring system | |
| CN115856185B (en) | Processing method and system of analyzer and readable storage medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20240308 |