CN112461771A - Automatic online real-time detection device and method for total iron of water vapor system of thermal power plant - Google Patents
Automatic online real-time detection device and method for total iron of water vapor system of thermal power plant Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 238000011897 real-time detection Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims description 112
- 229910052742 iron Inorganic materials 0.000 title claims description 57
- 239000012528 membrane Substances 0.000 claims abstract description 51
- 239000003814 drug Substances 0.000 claims abstract description 42
- 238000005070 sampling Methods 0.000 claims abstract description 40
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000001514 detection method Methods 0.000 claims abstract description 22
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 14
- 239000002699 waste material Substances 0.000 claims abstract description 14
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 13
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 13
- 239000000872 buffer Substances 0.000 claims abstract description 8
- 238000005259 measurement Methods 0.000 claims abstract description 7
- 238000002835 absorbance Methods 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 11
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- -1 polytetrafluoroethylene Polymers 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000013505 freshwater Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims 1
- 239000000126 substance Substances 0.000 description 13
- 239000003795 chemical substances by application Substances 0.000 description 7
- 239000006172 buffering agent Substances 0.000 description 6
- DGEZNRSVGBDHLK-UHFFFAOYSA-N [1,10]phenanthroline Chemical compound C1=CN=C2C3=NC=CC=C3C=CC2=C1 DGEZNRSVGBDHLK-UHFFFAOYSA-N 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 238000002798 spectrophotometry method Methods 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
- G01N1/4005—Concentrating samples by transferring a selected component through a membrane
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/03—Cuvette constructions
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- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
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Abstract
一种火电厂水汽系统全铁自动在线实时检测装置及方法，包括检测系统、加药系统、控制系统。检测系统包括取样架来水、取样泵、加热器、冷却器、膜浓缩、#1流通池、#2流通池、检测池、#1废液池、#2废液池入口。加药系统包括盐酸药罐、还原剂药罐、显色剂药罐、氨水药罐、缓冲剂药罐、#1微量泵、#2微量泵、#3微量泵、#4微量泵、#5微量泵。控制系统包括#1微量泵控制模块、#2微量泵控制模块、#3微量泵控制模块、#4微量泵控制模块、#5微量泵控制模块、取样泵控制模块、膜浓缩控制模块、智能控制模块。本发明提供的装置及方法可以实现火电厂水汽系统全铁自动在线实时检测，具有快速、准确、可靠性测定，检出限为0.2μg/L。
An automatic on-line real-time detection device and method for a water vapor system of a thermal power plant, comprising a detection system, a dosing system and a control system. The detection system includes water from the sampling rack, sampling pump, heater, cooler, membrane concentration, #1 flow cell, #2 flow cell, detection cell, #1 waste pool, and #2 waste pool inlet. The dosing system includes hydrochloric acid medicine tank, reducing agent medicine tank, color developer medicine tank, ammonia water medicine tank, buffer medicine tank, #1 micro pump, #2 micro pump, #3 micro pump, #4 micro pump, #5 Micro pump. The control system includes #1 micro pump control module, #2 micro pump control module, #3 micro pump control module, #4 micro pump control module, #5 micro pump control module, sampling pump control module, membrane concentration control module, intelligent control module. The device and method provided by the invention can realize the automatic on-line real-time detection of the water vapor system of the thermal power plant, with rapid, accurate and reliable measurement, and the detection limit is 0.2 μg/L.
Description
Technical Field
The invention relates to the field of water chemistry detection of power plants, in particular to an automatic online real-time detection device and method for total iron of a water vapor system of a thermal power plant.
Background
The quality of water vapor of a thermal power plant is an important parameter for operation control, wherein the content of iron in a corrosion product of a water vapor system is the only chemical monitoring index for evaluating the corrosion degree of equipment of the water vapor system, for a high-parameter unit, the expected value of the content of iron at the inlet of an economizer of the water vapor system is required to be less than 3 mug/L, the lowest detection limit of a phenanthroline spectrophotometry is 5 mug/L, manual sampling is needed, laboratory analysis is carried out, the time consumption is long, the determination result has time delay, online real-time online determination cannot be achieved, and if the water vapor system is corroded, the water vapor system cannot be processed in time.
By adopting the automatic online real-time detection device and method for the total iron of the water vapor system of the thermal power plant, the corrosion condition of the water vapor system can be mastered in real time, the detection limit can be improved through the concentration module, and serious economic and safety accidents of a unit caused by corrosion of the water vapor system are avoided.
Disclosure of Invention
The invention aims to provide an automatic online real-time detection device and method for total iron of a water vapor system of a thermal power plant, for a high-parameter unit, the iron content of a water vapor system is maintained at a lower level, GB/T12145-2016 requires that the standard value of the iron content of the high-parameter unit is less than 5 mug/L, the expected value is less than 3 mug/L, therefore, the traditional phenanthroline spectrophotometry is difficult to meet the test requirement, so that the device of the invention uses membrane concentration to improve the lowest detection limit of iron to 0.2 mug/L on the basis of the phenanthroline spectrophotometry, meanwhile, the real-time online determination of the total iron in the water vapor system is realized, the inaccuracy of the determination of the low-concentration iron by the phenanthroline spectrophotometry is fundamentally solved, the continuous online reading can be realized, the total iron content in the water vapor system is determined in real time, and the corrosion condition of the water vapor system is quickly reflected.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an automatic online real-time detection device for total iron of a water vapor system of a thermal power plant comprises a detection system, a dosing system and a control system; the detection system comprises a sampling frame incoming water 1, a sampling pump 2, a heater 3, a cooler 4, a membrane concentration 5, a #1 flow cell 6, a #2 flow cell 7, a visible light detector 8, a #1 waste liquid cell 9 and a #2 waste liquid cell 10; an outlet of incoming water 1 of the sampling frame is connected with an inlet of a sampling pump 2, an outlet of the sampling pump 2 is connected with an inlet of a heater 3, an outlet of the heater 3 is connected with an inlet of a cooler 4, an outlet of the cooler 4 is connected with an inlet of a membrane concentration 5, an outlet of a fresh water side of the membrane concentration 5 is connected with an inlet of a #1 waste liquid pool 9, an outlet of a concentrated water side of the membrane concentration 5 is connected with an inlet of a #1 flow cell 6, an outlet of the #1 flow cell 6 is connected with an inlet of a #2 flow cell 7, an outlet of the #2 flow cell 7 is connected with an inlet of a visible light detector 8, and an outlet of the visible light;
the dosing system comprises a hydrochloric acid medicine tank A, a reducing agent medicine tank B, a color developing agent medicine tank C, an ammonia water medicine tank D, a buffering agent medicine tank E, a #1 micro pump 11, a #2 micro pump 12, a #3 micro pump 13, a #4 micro pump 14 and a #5 micro pump 15; the outlet of the hydrochloric acid medicine tank A is connected with the inlet of a #1 micro pump 11, the outlet of the #1 micro pump 11 is connected with the outlet of a sampling pump 2, the outlet of a reducing agent medicine tank B is connected with the inlet of a #2 micro pump 12, the outlet of the #2 micro pump 12 is connected with the outlet of a membrane concentration 5 concentrated water side, the outlet of a color developing agent medicine tank C is connected with the inlet of a #3 micro pump 13, the outlet of the #3 micro pump 13 is connected with the outlet of a #1 flow cell 6, the outlet of an ammonia water medicine tank D is connected with the inlet of a #4 micro pump 14, the outlet of the #4 micro pump 14 is connected with the inlet of a #2 flow cell 7, the outlet of a buffering agent medicine tank E is connected with the inlet of a #5 micro pump 15, and the outlet of the #5 micro pump;
the control system comprises a #1 micro pump control module K11, a #2 micro pump control module K12, a #3 micro pump control module K13, a #4 micro pump control module K14, a #5 micro pump control module K15, a sample pump control module K2, a membrane concentration control module K5 and an intelligent control module K8;
the #1 micro pump control module K11 is connected with the #1 micro pump 11 and controls the flow of the #1 micro pump 11, the #2 micro pump control module K12 is connected with the #2 micro pump 12 and controls the flow of the #2 micro pump 12, the #3 micro pump control module K13 is connected with the #3 micro pump 13 and controls the flow of the #3 micro pump 13, the #4 micro pump control module K14 is connected with the #4 micro pump 14 and controls the flow of the #4 micro pump 14, the #5 micro pump control module K15 is connected with the #5 micro pump 15 and controls the flow of the #5 micro pump 15, the sampling pump control module K2 is connected with the sampling pump 2 and controls the flow of the sampling pump 2, the membrane concentration control module K5 is connected with the membrane concentration 5 and controls the concentration rate of the membrane concentration 5, and the intelligent control module K8 is divided into a curve drawing interface and a measuring interface.
The light path passing distance in the visible light detector 8 is 100 mm.
The chemical adding flow of the hydrochloric acid chemical tank A is 10-100 mu L/min, the chemical adding flow of the reducing agent chemical tank B is 0.1ml/min, the chemical adding flow of the color developing agent chemical tank C is 1ml/min, the chemical adding flow of the buffering agent chemical tank E is 1ml/min, and the chemical adding flow of the hydrochloric acid chemical tank A and the chemical adding flow of the ammonia water chemical tank D are controlled together by 5 multiplying factors of membrane concentration.
The pipelines passing through the heater 3 and the cooling pipe 4 are made of acid-resistant and high-temperature-resistant glass, and other pipelines are made of polytetrafluoroethylene.
The #1 micro pump 11, #2 micro pump 12, #3 micro pump 13, #4 micro pump 14, #5 micro pump 15, sampling pump 2, hydrochloric acid medicinal tank A, reducing agent medicinal tank B, color developing agent medicinal tank C, ammonia water medicinal tank D and buffer medicinal tank E are all made of polytetrafluoroethylene materials.
The #1 flow cell 6 and the #2 flow cell 7 are closed cells and are not communicated with the atmosphere.
The detection method of the automatic online real-time detection device for the total iron of the water vapor system of the thermal power plant can be used for continuously detecting the total iron of the water vapor system, and comprises the following specific steps:
the concentration of each sample injection point configured and the concentration ratio of the membrane concentration control module K5 are set on a curve drawing interface of the intelligent control module K8, the measured absorbance of the visible light detector 7 is transmitted to the intelligent control module K8 through an electric signal, the measured absorbance is the iron concentration after membrane concentration 5, a standard curve is drawn under the same concentration ratio, and the drawn curve is the relation between the iron concentration after membrane concentration 5 and the absorbance, so that the standard curve of the iron concentration after membrane concentration and the absorbance is obtained; when the unknown sample is measured, the measurement interface is switched to, the absorbance of the unknown sample to be measured is read out by the unknown sample to be measured through a visible light detector 8 in the detection system, the concentrated iron concentration of the unknown sample to be measured is obtained according to a standard curve, the concentrated iron concentration is divided by the concentration ratio set in the membrane concentration control module K5 to obtain the iron concentration of the unknown sample to be measured, and the iron concentration of the unknown sample to be measured is finally displayed by the display screen to be the iron concentration of the intake water of the sampling frame.
The iron concentration reading time was set to 5 minutes reading times.
Compared with the prior art, the invention has the following advantages:
(1) the invention realizes the blank of the field of all iron in the online automatic continuous testing water vapor system.
(2) The method can read the iron content of the water vapor system in real time on line, is convenient and quick to operate, does not need manual operation, saves labor cost, can avoid water sample pollution, and has high automation degree.
(3) The invention combines the membrane concentration technology with the phenanthroline spectrophotometry, improves the detection limit of the iron concentration to be 0.2 mu g/L, meets the requirement of testing the iron content of the water vapor system of the high-parameter unit, can realize the automatic online real-time detection of the total iron of the water vapor system of the thermal power plant, and has the advantages of rapidness, accuracy and high measurement reliability.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Fig. 2 is a schematic diagram of the control system of the present invention.
Wherein, 1 is the sample frame water that comes, 2 is the sample pump, 3 is the heater, 4 is the cooler, 5 is the membrane concentration, 6 is #1 flow-through cell, 7 is #2 flow-through cell, 8 is visible light detector, 9 is #1 waste liquid pond, 10 is #2 waste liquid pond, 11 is #1 micropump, 12 is #2 micropump, 13 is #3 micropump, 14 is #4 micropump, 15 is #5 micropump, A is the hydrochloric acid medicinal cupping, B is the reductant medicinal cupping, C is the developer medicinal cupping, D is the aqueous ammonia medicinal cupping, E is the buffer medicinal cupping. K11 is the #1 micro pump control module, K12 is the #2 micro pump control module, K13 is the #3 micro pump control module, K14 is the #4 micro pump control module, K15 is the #5 micro pump control module, K2 is the sampling pump control module, K5 is the membrane concentration control module, and K8 is the intelligent control module.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in FIG. 1, the automatic online real-time detection device for the total iron of the water vapor system of the thermal power plant comprises a detection system, a dosing system and a control system; the detection system comprises a sampling frame incoming water 1, a sampling pump 2, a heater 3, a cooler 4, a membrane concentration 5, a #1 flow cell 6, a #2 flow cell 7, a visible light detector 8, a #1 waste liquid cell 9 and a #2 waste liquid cell 10; an outlet of incoming water 1 of the sampling frame is connected with an inlet of a sampling pump 2, an outlet of the sampling pump 2 is connected with an inlet of a heater 3, an outlet of the heater 3 is connected with an inlet of a cooler 4, an outlet of the cooler 4 is connected with an inlet of a membrane concentration 5, an outlet of a fresh water side of the membrane concentration 5 is connected with an inlet of a #1 waste liquid pool 9, an outlet of a concentrated water side of the membrane concentration 5 is connected with an inlet of a #1 flow cell 6, an outlet of the #1 flow cell 6 is connected with an inlet of a #2 flow cell 7, an outlet of the #2 flow cell 7 is connected with an inlet of a visible light detector 8, and an outlet of the visible light;
the dosing system comprises a hydrochloric acid medicine tank A, a reducing agent medicine tank B, a color developing agent medicine tank C, an ammonia water medicine tank D, a buffering agent medicine tank E, a #1 micro pump 11, a #2 micro pump 12, a #3 micro pump 13, a #4 micro pump 14 and a #5 micro pump 15; the outlet of the hydrochloric acid medicine tank A is connected with the inlet of a #1 micro pump 11, the outlet of the #1 micro pump 11 is connected with the outlet of a sampling pump 2, the outlet of a reducing agent medicine tank B is connected with the inlet of a #2 micro pump 12, the outlet of the #2 micro pump 12 is connected with the outlet of a membrane concentration 5 concentrated water side, the outlet of a color developing agent medicine tank C is connected with the inlet of a #3 micro pump 13, the outlet of the #3 micro pump 13 is connected with the outlet of a #1 flow cell 6, the outlet of an ammonia water medicine tank D is connected with the inlet of a #4 micro pump 14, the outlet of the #4 micro pump 14 is connected with the inlet of a #2 flow cell 7, the outlet of a buffering agent medicine tank E is connected with the inlet of a #5 micro pump 15, and the outlet of the #5 micro pump;
the control system comprises a #1 micro pump control module K11, a #2 micro pump control module K12, a #3 micro pump control module K13, a #4 micro pump control module K14, a #5 micro pump control module K15, a sample pump control module K2, a membrane concentration control module K5 and an intelligent control module K8;
the #1 micro pump control module K11 is connected with the #1 micro pump 11 and controls the flow of the #1 micro pump 11, the #2 micro pump control module K12 is connected with the #2 micro pump 12 and controls the flow of the #2 micro pump 12, the #3 micro pump control module K13 is connected with the #3 micro pump 13 and controls the flow of the #3 micro pump 13, the #4 micro pump control module K14 is connected with the #4 micro pump 14 and controls the flow of the #4 micro pump 14, the #5 micro pump control module K15 is connected with the #5 micro pump 15 and controls the flow of the #5 micro pump 15, the sampling pump control module K2 is connected with the sampling pump 2 and controls the flow of the sampling pump 2, the membrane concentration control module K5 is connected with the membrane concentration 5 and controls the concentration rate of the membrane concentration 5, and the intelligent control module K8 is divided into a curve drawing interface and a measuring interface.
As a preferred embodiment of the present invention, the light path passing distance in the visible light detector 8 is 100 mm.
According to a preferred embodiment of the invention, the dosing flow of the hydrochloric acid tank A is 10-100 mu L/min, the dosing flow of the reducing agent tank B is 0.1ml/min, the dosing flow of the color developing agent tank C is 1ml/min, the dosing flow of the buffering agent tank E is 1ml/min, and the dosing flow of the hydrochloric acid tank A and the dosing flow of the ammonia water tank D are controlled together by 5-rate membrane concentration.
In a preferred embodiment of the present invention, the pipe passage through the heater 3 and the cooling pipe 4 is made of an acid-resistant and high-temperature-resistant glass material, and the other pipe passages are made of a polytetrafluoroethylene material.
In a preferred embodiment of the present invention, the #1 micro pump 11, #2 micro pump 12, #3 micro pump 13, #4 micro pump 14, #5 micro pump 15, sampling pump 2, hydrochloric acid tank a, reducing agent tank B, developer tank C, ammonia tank D, and buffer tank E are all made of polytetrafluoroethylene.
In a preferred embodiment of the present invention, the #1 flow cell 6 and the #2 flow cell 7 are closed cells and do not communicate with the atmosphere.
The detection method of the automatic online real-time detection device for the total iron of the water vapor system of the thermal power plant can continuously detect the total iron of the water vapor system, and comprises the following specific steps:
the concentration of each sample injection point configured and the concentration ratio of the membrane concentration control module K5 are set on a curve drawing interface of the intelligent control module K8, the measured absorbance of the visible light detector 7 is transmitted to the intelligent control module K8 through an electric signal, the measured absorbance is the iron concentration after membrane concentration 5, a standard curve is drawn under the same concentration ratio, and the drawn curve is the relation between the iron concentration after membrane concentration 5 and the absorbance, so that the standard curve of the iron concentration after membrane concentration and the absorbance is obtained; when the unknown sample is measured, the measurement interface is switched to, the absorbance of the unknown sample to be measured is read out by the unknown sample to be measured through a visible light detector 8 in the detection system, the concentrated iron concentration of the unknown sample to be measured is obtained according to a standard curve, the concentrated iron concentration is divided by the concentration ratio set in the membrane concentration control module K5 to obtain the iron concentration of the unknown sample to be measured, and the iron concentration of the unknown sample to be measured is finally displayed by the display screen to be the iron concentration of the intake water of the sampling frame.
As a preferred embodiment of the present invention, the iron concentration reading time is set to 5 minutes reading times.
Claims (8)
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114018893A (en) * | 2021-11-30 | 2022-02-08 | 西安热工研究院有限公司 | A method and device for detecting iron content in water vapor system of thermal power plant based on molecular probe method |
| CN114689574A (en) * | 2022-03-30 | 2022-07-01 | 西安热工研究院有限公司 | Device and method for online detection of full-range iron content in water |
| CN114689524A (en) * | 2022-03-30 | 2022-07-01 | 西安热工研究院有限公司 | Online iron analysis device of water vapor system based on chromatic aberration analysis |
| CN115236017A (en) * | 2022-08-18 | 2022-10-25 | 西安热工研究院有限公司 | On-line detection system and method for full-range iron content in water vapor system of power plant |
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| CN115236017A (en) * | 2022-08-18 | 2022-10-25 | 西安热工研究院有限公司 | On-line detection system and method for full-range iron content in water vapor system of power plant |
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