CN105891073A - Online detection device and method for iron content in thermodynamic system start washing water - Google Patents
Online detection device and method for iron content in thermodynamic system start washing water Download PDFInfo
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- CN105891073A CN105891073A CN201610206924.6A CN201610206924A CN105891073A CN 105891073 A CN105891073 A CN 105891073A CN 201610206924 A CN201610206924 A CN 201610206924A CN 105891073 A CN105891073 A CN 105891073A
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- iron content
- measuring cell
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 100
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 50
- 238000001514 detection method Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title abstract description 15
- 238000005406 washing Methods 0.000 title abstract 3
- 238000012545 processing Methods 0.000 claims abstract description 25
- 238000004140 cleaning Methods 0.000 claims abstract description 14
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000002245 particle Substances 0.000 claims abstract description 7
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000011010 flushing procedure Methods 0.000 claims description 34
- 238000012544 monitoring process Methods 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000002244 precipitate Substances 0.000 claims description 3
- 239000000047 product Substances 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 238000003321 atomic absorption spectrophotometry Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/075—Investigating concentration of particle suspensions by optical means
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses an online detection device and method for iron content in thermodynamic system start washing water. The detection device comprises a sample measuring pool, a light source emitting unit, a photoelectric detection unit, a signal processing unit, a microcomputer processing unit and an ultrasonic automatic cleaning module. The light source emitting unit provides parallel light and enables the parallel light to enter a water sample to be detected in the sample measuring pool in a vertical incident mode. The photoelectric detection unit receives suspended ferric oxide particles in the water sample to be detected in the sample measuring pool to enable the light to be scattered. The signal processing unit, the microcomputer processing unit and the ultrasonic automatic cleaning module are sequentially connected with the photoelectric detection unit. The ultrasonic automatic cleaning module is connected with the sample measuring pool. The invention further provides a detection method of the detection device. By means of the online detection device and method, the iron content in the generator set start washing water can be rapidly detected.
Description
Technical field
The present invention relates to thermal power plant's water-chemical regime technical field, be specifically related to a kind of therrmodynamic system and start
Iron content on-line measuring device and method in flushing water.
Background technology
In fired power generating unit therrmodynamic system starts cold and hot flushing process, iron content decides flushing water row
Put and reclaim, ignition of the boiler and steam turbine red switch opportunity.Rinsing not thorough, iron content is defective to pot
Stove fouling, corrosion and turbine blade incrustation can produce and be difficult to estimation impact；And excessively rinse not only
Cause the waste of demineralized water and boiler oil, also can reduce unit availability simultaneously, affect generated energy,
Less economical.Therefore, thermal power plant's generating set starts in flushing process, and in flushing water, iron content is weight
Point detection and supervision project, be also the important indicator affecting unit efficiency and security.Current state
It is commonplace that interior supercritical boiler scaling rate is higher, turbine blade amasss the phenomenons such as iron dirt, machine
It is one of the main reasons that group startup is rinsed water quality defective.
The iron rot product major part that generating set starts in flushing water is particle iron or CI, exists
Mass concentration is high, change is fast, fluctuate big feature；In unit starting flushing process, in flushing water
Iron content accuracy requirement is the highest, but requires to provide rapidly iron content data, in order to can grasp at any time
Therrmodynamic system rinses situation, adjusts unit starting step sequence in time.
Major part power plant uses laboratory Phen AAS test water-steam system corrosion at present
Product assay, the method complex operation, analytical cycle length (50～60min), it is provided that data are the most stagnant
After；It is difficult to grasp in time the situation of iron content change during unit starting, the most just cannot ensure as machine
Group starts provides qualified water.The precision of atomic absorption spectrophotometry test iron content is high, speed is fast,
Relatively it is adapted to the off-line test of Trace Iron content in unit running process, but flushed at unit starting
Journey cannot use, and instrument precision, costliness, Operation and Maintenance costly, is difficult to popularize aborning.
The most common cartridge bag method, micro-porous filter (reference colour block-regulations) although etc. there is the spy of quickly mensuration
Fixed, but continuous on-line monitoring can not be realized.
Summary of the invention
In order to solve the problem that above-mentioned prior art exists, it is an object of the invention to provide a kind of heating power
System starts iron content on-line measuring device and method in flushing water, it is possible to quickly detection generating set opens
Iron content in dynamic flushing water.
For reaching object above, the present invention adopts the following technical scheme that
A kind of therrmodynamic system starts iron content on-line measuring device in flushing water, including sample measuring cell 2,
Light source in parallel rays being provided and parallel rays being impinged perpendicularly on the water sample to be measured of sample measuring cell 2
Transmitter unit 1, receives suspension ferric oxide particles in the water sample to be measured of sample measuring cell 2 and makes light send out
The photoelectric detection unit 3 of the scattered light of raw scattering, at the signal being sequentially connected with photoelectric detection unit 3
Reason unit 4, computer processing unit 5 and the automatic cleaning module of ultrasonic wave 6, ultrasonic wave cleans automatically
Module 6 is connected with sample measuring cell 2.
Therrmodynamic system described above starts the detection method of iron content on-line measuring device in flushing water,
The parallel rays provided by light source transmitter unit 1, impinges perpendicularly on the water to be measured in sample measuring cell 2
In sample, in water sample to be measured, suspension ferric oxide particles makes light scatter, and scattered light is by photodetection
Unit 3 receives, and optical signal is passed to signal processing unit 4, signal transacting by photoelectric detection unit 3
Unit 4 carries out conditioning conversion to optical signal, after filter amplifying processing, be changed into voltage signal, then by
Computer processing unit 5 gathers voltage signal and calculates in corresponding water sample to be measured according to following Mathematical Modeling
Iron content；
Y=kx-x0)+b
In model: y is iron content in testing sample, μ g/L；X is water sample magnitude of voltage to be measured, mV；
x0For iron blank water sample magnitude of voltage, mV；K and b is linear fit coefficient；
Manipulation personnel, according to the iron content data of detection, select corresponding unit starting to rinse step sequence, machine
At the end of group starts flushing, computer processing unit 5 control the automatic cleaning module of ultrasonic wave 6, automatically
Start Ultrasonic Cleaning program, and inject chemical cleaning media to sample measuring cell 2, to remove sample
The precipitate of iron oxide of attachment on measuring cell 2 surface；
Sample measuring cell 2 gathers the water sample of flushing water monitoring point automatically, is automatically drained out sample after completing detection
Water sample in product measuring cell 2, and Resurvey water sample, detect next time.
The measurement scope of described iron content is 30～2000 μ g/L.
Compared with prior art, present invention have the advantage that
Apparatus of the present invention and method are simple and environmentally-friendly, practical, it is possible to quickly detection generating set starts punching
Iron content in wash water, grasps therrmodynamic system at any time and rinses situation, the discharge of accurate assurance flushing water or recovery
And the opportunity that ignition of the boiler, steam turbine red switch are grid-connected.Both can ensure therrmodynamic system developing result, keep away
Exempt from defective water quality and cause boiler corrosion, scale problems, it is possible to avoid excessively rinsing cause demineralized water,
The waste of fuel, improves unit utilization rate, has good economic benefits.
Accompanying drawing explanation
Fig. 1 is present configuration schematic diagram.
Detailed description of the invention
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
As it is shown in figure 1, one therrmodynamic system of the present invention starts iron content on-line measuring device in flushing water,
Including sample measuring cell 2, it is provided that parallel rays is also impinged perpendicularly on sample measuring cell 2 by parallel rays
Water sample to be measured in light source transmitter unit 1, receive sample measuring cell 2 water sample to be measured in suspension
Ferric oxide particles makes light the photoelectric detection unit 3 of the scattered light scattered occur, with photoelectric detection unit
Signal processing unit 4, computer processing unit 5 and the automatic cleaning module of ultrasonic wave 6 that 3 are sequentially connected with,
The automatic cleaning module of ultrasonic wave 6 is connected with sample measuring cell 2.
Therrmodynamic system described above starts the detection method of iron content on-line measuring device in flushing water,
Generating set therrmodynamic system starts flushing process, and the water sample of flushing water monitoring point is introduced sample measuring cell
In 2, instrument power source, light source transmitter unit 1 parallel rays provided are provided, impinge perpendicularly on sample
In water sample to be measured in product measuring cell 2, in water sample to be measured, suspension ferric oxide particles makes light occur to dissipate
Penetrating, scattered light is received by photoelectric detection unit 3, and optical signal is passed to signal by photoelectric detection unit 3
Processing unit 4, after signal processing unit 4 carries out conditioning conversion, filter amplifying processing to optical signal,
It is changed into voltage signal, then is gathered voltage signal and according to following Mathematical Modeling by computer processing unit 5
Calculate the iron content in corresponding water sample to be measured；
Y=k (x-x0)+b
In model: y is iron content in testing sample, μ g/L；X is water sample magnitude of voltage to be measured, mV；
x0For iron blank water sample magnitude of voltage, mV；K and b is linear fit coefficient；
The Mathematical Modeling acquisition mode of storage in described computer processing unit 5 is: gather therrmodynamic system
Start the flushing water sample rinsing different phase to believe as standard sample, the voltage measuring the generation of its scattered light
Number value, use Atomic absorption flame method after being cleared up by sample oxidation iron particulate matter to measure its full iron dense simultaneously
Degree, then magnitude of voltage and concentration of iron data are carried out least-squares algorithm linear fitting, obtain voltage signal with
The Mathematical Modeling of concentration of iron.
Manipulation personnel, according to the iron content data of detection, select corresponding unit starting to rinse step sequence, machine
At the end of group starts flushing, computer processing unit 5 control the automatic cleaning module of ultrasonic wave 6, automatically
Start Ultrasonic Cleaning program, and inject chemical cleaning media to sample measuring cell 2, to remove sample
The precipitate of iron oxide of attachment on measuring cell 2 surface.
Sample measuring cell 2 gathers the water sample of flushing water monitoring point automatically, is automatically drained out sample after completing detection
Water sample in product measuring cell 2, and Resurvey water sample, detect next time.The knot of detection every time
Fruit can reflect the change of iron content in flushing water in time, and manipulation personnel can be with according to the data of detection
Time grasp therrmodynamic system rinse situation, accurate assurance flushing water discharge or reclaim and ignition of the boiler, vapour
The opportunity that turbine red switch is grid-connected.During low pressure feed water system flush, monitoring point iron content is more than 1000 μ g/L
Time, flushing water directly discharges, and system open loop cleans；When monitoring point iron content is less than 1000 μ g/L,
Flushing water reclaims, system circulation flushing (put into operation precision processing filter and mixed bed).When oxygen-eliminating device exports
When flushing water iron content is less than 500 μ g/L, proceeds to high-pressure feed water system flush step sequence, arrange to separator
Water iron content is less than 500 μ g/L, and separator stops draining, is circulated flushing.To economizer entrance
When feedwater iron content is less than 50 μ g/L, boiler can be lighted a fire；When main steam iron content is less than 50 μ g/L
Time, steam turbine can red switch.
Claims (3)
1. a therrmodynamic system starts iron content on-line measuring device in flushing water, it is characterised in that:
Including sample measuring cell (2), it is provided that parallel rays is also impinged perpendicularly on sample measuring cell by parallel rays
(2) the light source transmitter unit (1) in water sample to be measured, receives the water to be measured of sample measuring cell (2)
In sample, suspension ferric oxide particles makes light that the photoelectric detection unit (3) of the scattered light scattered to occur, with
Signal processing unit (4) that photoelectric detection unit (3) is sequentially connected with, computer processing unit (5) with
And the automatic cleaning module of ultrasonic wave (6), the automatic cleaning module of ultrasonic wave (6) and sample measuring cell (2)
It is connected.
Therrmodynamic system the most according to claim 1 starts iron content on-line checking dress in flushing water
The detection method put, it is characterised in that: the parallel rays provided by light source transmitter unit (1), hangs down
Directly incide in the water sample to be measured in sample measuring cell (2), suspension iron oxide in water sample to be measured
Grain makes light scatter, and scattered light is received by photoelectric detection unit (3), photoelectric detection unit (3)
Optical signal passes to signal processing unit (4), and optical signal is adjusted by signal processing unit (4)
After reason conversion, filter amplifying processing, it is changed into voltage signal, then is adopted by computer processing unit (5)
Collecting voltage signal also calculates the iron content in corresponding water sample to be measured according to following Mathematical Modeling；
Y=k (x-x0)+b
In model: y is iron content in testing sample, μ g/L；X is water sample magnitude of voltage to be measured, mV；
x0For iron blank water sample magnitude of voltage, mV；K and b is linear fit coefficient；
Manipulation personnel, according to the iron content data of detection, select corresponding unit starting to rinse step sequence, machine
At the end of group starts flushing, computer processing unit (5) control the automatic cleaning module of ultrasonic wave (6),
Automatically start Ultrasonic Cleaning program, and inject chemical cleaning media to sample measuring cell (2), with
Remove the precipitate of iron oxide of attachment on sample measuring cell (2) surface；
Sample measuring cell (2) gathers the water sample of flushing water monitoring point automatically, automatically arranges after completing detection
Go out the water sample in sample measuring cell (2), and Resurvey water sample, detect next time.
Detection method the most according to claim 2, it is characterised in that: the survey of described iron content
Weight range is 30～2000 μ g/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610206924.6A CN105891073A (en) | 2016-04-05 | 2016-04-05 | Online detection device and method for iron content in thermodynamic system start washing water |
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| CN201610206924.6A CN105891073A (en) | 2016-04-05 | 2016-04-05 | Online detection device and method for iron content in thermodynamic system start washing water |
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Effective date of registration: 20181012 Address after: 710032 Xingqing Road, Xi'an, Shaanxi 136 Applicant after: Xi'an Thermal Power Research Institute Co., Ltd. Address before: 710075 B Torch Hotel, Gaoxin Road, Xi'an, Shaanxi. Applicant before: XI'AN XIRE POWER STATION CHEMICAL SCIENCE & TECHNOLOGY CO., LTD. |
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Application publication date: 20160824 |