CN204649561U - A kind of fuel-burning power plant unit thermodynamic system non-solubility iron content determinator - Google Patents
A kind of fuel-burning power plant unit thermodynamic system non-solubility iron content determinator Download PDFInfo
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- CN204649561U CN204649561U CN201520404026.2U CN201520404026U CN204649561U CN 204649561 U CN204649561 U CN 204649561U CN 201520404026 U CN201520404026 U CN 201520404026U CN 204649561 U CN204649561 U CN 204649561U
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- miillpore filter
- solubility
- branch road
- iron
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 85
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 238000005070 sampling Methods 0.000 claims abstract description 21
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract description 16
- 238000012544 monitoring process Methods 0.000 abstract description 12
- 238000005260 corrosion Methods 0.000 abstract description 9
- 230000007797 corrosion Effects 0.000 abstract description 9
- 230000008021 deposition Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 12
- 230000009467 reduction Effects 0.000 description 10
- 230000008859 change Effects 0.000 description 8
- 230000004907 flux Effects 0.000 description 8
- 238000001816 cooling Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 238000003556 assay Methods 0.000 description 3
- 235000014171 carbonated beverage Nutrition 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000004164 analytical calibration Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- -1 iron ion Chemical class 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000004706 metal oxides Chemical group 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 230000005477 standard model Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Abstract
The utility model relates to a kind of fuel-burning power plant unit thermodynamic system non-solubility iron content determinator, comprise the therrmodynamic system steam water sampling pipeline being provided with the first valve and the second valve, it is first, therrmodynamic system steam water sampling pipeline between two valves offers branch road, the other end of this branch road is connected on the therrmodynamic system steam water sampling pipeline after the second valve, the pipeline of described branch road is provided with in turn the 3rd valve, flowmeter and miillpore filter, bypass line between flowmeter and miillpore filter is provided with pressure difference transmitter, the other end of pressure difference transmitter be connected to miillpore filter after bypass line on.This device can accurately, reliable, monitoring non-solubility colloidal state and particulate iron oxide continuously content, true reflect heat Force system corrosion protection effect and deposition level.
Description
Technical field
The utility model belongs to coal unit boiler feed water processing technology field, is specifically related to a kind of fuel-burning power plant unit thermodynamic system non-solubility iron content determinator.
Background technology
Steam is the periodic duty medium of thermal power generation unit heat power equipment, and water and steam quality is significant to the corrosion protection of heat power equipment, operation life and safety and economic operation.GB/T 12145-2008 " thermal power generation unit and apparatus of steam power plants Water Vapor Quality " makes clear stipulaties to the indices of Steam-water Quality.Wherein, therrmodynamic system iron content represents the corrosive effect of equipment, and being one of important indicator of monitoring, is also one of major tasks of chemical supervision work.Major overhaul checks, water-cooling wall, economizer pipe cutting, dirty composition Fe(is with Fe
2o
3meter) account for more than 90% (when leakage and seepage do not occur condenser tube), salt deposition on turbine blade also has ferriferous oxide in various degree.But on-site actual situations shows:
1) data combined generating plant therrmodynamic system Steam-water Quality detects are seen, no matter adopt which kind of Water purification mode, most unit iron contents meet the requirement of GB/T 12145-2008 expectation value, most of data are all at 3 below μ g/L, but scaling rate does not reach the class level specified in DL/T 1115-2009, fouling, salification speed are higher.Analyze its reason as follows:
The main existence form of therrmodynamic system iron: along with the operation operation of Large Copacity high pressure high temperature turbosets and the maturation development of Boiler water Feeding System technology, therrmodynamic system Steam-water Quality is become better and better, under the condition almost removing salt soda water, the dissolubility iron ion content combined in the form of salts is very little, and under generating plant therrmodynamic system carbonated drink alkali condition, except minute quantity is with except ionic condition existence, most iron, all because of metal light microcorrosion, exists with the metal oxide form of colloidal attitude.These corrosion products are under high temperature, condition of high voltage, and ferriferous oxide is enriched in Boiler Metallic surface thermal load higher part position gradually, form sediment.Therefore, the Iron speciation measuring major effect to dirt is colloidal state and the particulate iron oxide of non-solubility, and ionic state iron there is no contribution.
The detection of therrmodynamic system iron: in actual testing process, no matter adopt spectrophotometric method or atom absorption method to detect, when sample pretreatment, it is limited that ferriferous oxide clears up conversion ratio, and the iron detected is mainly deliquescent ionic state iron, and unit is μ g/L.Colloidal state iron is difficult to be detected, and therefore, truly cannot deposit level by reflect heat Force system.
When calibrating instrument with iron standard model, in standard specimen, iron is deliquescent ionic state iron.Therefore, although during instrument calibration, indicating value is accurate, and actual therrmodynamic system non-solubility colloidal state ferriferous oxide is difficult to simulation, causes the illusion that in therrmodynamic system carbonated drink, iron content is very low.
2) cannot realize the continuous monitoring to iron, once, can there is contingency in data for general one week of electricity power enterprise or monitoring in two weeks.
3) though online iron table can realize the continuous monitoring to iron, and because technical development is immature, range of application is very little, and expensive, and monitoring dissolubility ionic state iron is still limited to.
By to certain cartridge surface sediment assay before in-line meter between chemical sampling, result shows: iron oxide accounts for 98.4%, and monox accounts for 0.24%, and aluminium oxide accounts for 0.26%.Above data show, therrmodynamic system colloidal state or the graininess sediment overwhelming majority are ferriferous oxides.The main source of the therrmodynamic system high deposition rate that non-solubility colloidal state and granular iron oxide are and salification rate.The major overhaul cycle is longer, by the iron concentration of routine testing, can not reflect the real source of fouling and salification, cannot true reflect heat Force system corrosion protection effect.Therefore, be badly in need of a kind of accurately, reliable, method that non-solubility colloidal state and particulate iron oxide can be monitored continuously, reflect heat Force system deposition level.
Utility model content
The utility model object is to provide a kind of thermal power generation unit therrmodynamic system non-solubility iron content determinator, it can realize the continuous monitoring to the ferriferous oxide that colloidal state or the graininess of non-solubility exist, method is simple, instrument economy, the more important thing is, can by daily monitoring true reflect heat Force system corrosion protection level.
For achieving the above object, the utility model adopts following technical scheme:
A kind of fuel-burning power plant unit thermodynamic system non-solubility Methods For The Determination of Iron, it comprises the steps:
1) on the steam water sampling pipeline of therrmodynamic system plan mensuration, arrange branch road, bypass line is provided with flowmeter, miillpore filter and pressure difference transmitter;
2) bypass line is cleaned up, make water sample enter bypass line, record the pressure reduction change under certain integrated flux or the weightening finish of miillpore filter, by the stifled index ICFD of following formulae discovery colloidal state iron dirt
Δ por ICFD
Δ m:
In formula: Δ p-pressure reduction, Pa; S-water sample by the useful area of miillpore filter, cm
2; V-water sample by the integrated flux of miillpore filter, m
3; Δ m-water sample passes through forward and backward, the weightening finish of miillpore filter, g.
Concrete, the pore diameter range of described miillpore filter is 0.001 ~ 0.02 μm.
A kind of device utilizing said method to measure fuel-burning power plant unit thermodynamic system non-solubility iron content, comprise the therrmodynamic system steam water sampling pipeline being provided with the first valve and the second valve, wherein, first, therrmodynamic system steam water sampling pipeline between two valves offers branch road, the other end of this branch road is connected on the therrmodynamic system steam water sampling pipeline after the second valve, the pipeline of described branch road is provided with in turn the 3rd valve, flowmeter and miillpore filter, bypass line between flowmeter and miillpore filter is provided with pressure difference transmitter, the other end of pressure difference transmitter be connected to miillpore filter after bypass line on.
The principle of fuel-burning power plant described in the utility model unit thermodynamic system non-solubility Methods For The Determination of Iron is: the blocking (miillpore filter pore diameter range is at 0.001 ~ 0.02 μm) utilizing colloidal attitude and particulate iron oxide to cause miillpore filter, by analytical unit area, specific discharge water sample by miillpore filter both sides pressure reduction or weight change index, reflect heat Force system corrosion protection effect.In assay method, introduce the concept (being called for short ICFD) of therrmodynamic system " the stifled index of colloidal state iron dirt ", represent non-solubility ferriferous oxide colloid and granular concentration in therrmodynamic system carbonated drink with ICFD numerical value.By measuring ICFD
Δ Por ICFD
Δ mcharacterize the corrosion protection level of therrmodynamic system, the stifled exponential number of colloidal state iron dirt of mensuration is higher, and illustrate dirty stifled more serious, therrmodynamic system corrosion protection effect is poorer, and deposition is higher.
Said method is used to measure the device of thermal power generation unit therrmodynamic system non-solubility iron content, it implements to the steam water sampling pipeline intending measurement site the transformation increasing branch road, install flowmeter, miillpore filter and pressure difference transmitter additional, make water sample by miillpore filter, calculate water sample by the pressure reduction change ICFD before and after miillpore filter
Δ por weight change ICFD
Δ m;
In formula: Δ p-pressure reduction, Pa; S-water sample by the useful area of miillpore filter, cm
2; V-water sample by the integrated flux of miillpore filter, m
3; Δ m-water sample passes through forward and backward, the weightening finish of miillpore filter, g.
Compare with assay method DL/T 955-2005 " the mensuration graphite oven atomic absorption of fuel-burning power plant water, vapour test method copper, iron ", ICFD represents unit area, specific discharge water sample by both sides pressure reduction after miillpore filter or weight change index, situation is blocked up in the colloidal state and the dirt of particulate iron oxide to film that reflect non-solubility in therrmodynamic system water sample, and unit is Pa/ (cm
2m
3) or mg/ (cm
2m
3); According to DL/T 955-2005 mensuration is ionic state iron, and unit is mg/L.
The utility model method and apparatus can accurately, reliable, monitoring non-solubility colloidal state and particulate iron oxide continuously content, instrument and equipment cost is low, can truly reflect heat Force system corrosion protection effect and the level of deposition.
Accompanying drawing explanation
Fig. 1 is the structural representation of fuel-burning power plant described in the utility model unit thermodynamic system non-solubility iron content determinator.
Embodiment
Do to introduce in detail further to the technical solution of the utility model below in conjunction with embodiment, but protection domain of the present utility model is not limited thereto.
embodiment 1
Certain 600MW unit, feedwater adopts AVT (R) processing mode.Major overhaul checks, find that water-cooling wall, economizer, turbine blade deposition are higher, water-cooling wall is 95 g/ (m to fiery side scaling rate
2a), economizer is 73 g/ (m to cigarette side scaling rate
2a), the highest salification speed of steam turbine high-pressure cylinder blade is 5.4mg/ (cm
2a).For reducing deposition, improve security and the economy of unit operation, after to units chemical cleaning, oxidizing treatment method is implemented in the feedwater of this unit, implement oxidizing treatment after 2 years, major overhaul inspection, water-cooling wall is 34 g/ (m to fiery side scaling rate
2a), economizer is 29 g/ (m to cigarette side scaling rate
2a), the highest salification speed of steam turbine high-pressure cylinder blade is 1.4mg/ (cm
2a).
A kind of fuel-burning power plant unit thermodynamic system non-solubility Methods For The Determination of Iron, it comprises the steps:
1) on the steam water sampling pipeline (i.e. economizer entrance pipe) of therrmodynamic system plan mensuration, arrange branch road, bypass line is provided with flowmeter, miillpore filter and pressure difference transmitter; The pore diameter range of described miillpore filter is 0.001 ~ 0.02 μm;
2) bypass line is cleaned up, make water sample enter bypass line, record the pressure reduction change under certain integrated flux or the weightening finish of miillpore filter, by the stifled index ICFD of following formulae discovery colloidal state iron dirt
Δ por ICFD
Δ m:
In formula: Δ p-pressure reduction, Pa; S-water sample by the useful area of miillpore filter, cm
2; V-water sample by the integrated flux of miillpore filter, m
3; Δ m-water sample passes through forward and backward, the weightening finish of miillpore filter, g.
As shown in Figure 1, a kind of device utilizing said method to measure fuel-burning power plant unit thermodynamic system non-solubility iron content, comprise the therrmodynamic system steam water sampling pipeline 8 being provided with the first valve 1 and the second valve 6, wherein, at the first valve 1, therrmodynamic system steam water sampling pipeline 8 between second valve 6 offers branch road 7, the other end of this branch road 7 is connected on the therrmodynamic system steam water sampling pipeline 8 after the second valve 6, the pipeline of described branch road 7 is provided with in turn the 3rd valve 2, flowmeter 3 and miillpore filter 5, bypass line between flowmeter 3 and miillpore filter 5 is provided with pressure difference transmitter 4, the other end of pressure difference transmitter 4 be connected to miillpore filter after branch road 7 pipeline on.
The use principle of operation of said determination fuel-burning power plant unit thermodynamic system non-solubility iron content device is as follows:
1) by the switching controlling the first valve 1, second valve 6 or the first valve 1, the 3rd valve 2 realizes therrmodynamic system steam water sampling pipeline 8 and sampling slip 7.When not needing monitoring therrmodynamic system non-solubility colloidal state and granular iron content, open the first valve 1 and the second valve 6, closing the 3rd valve 2, is normal operating condition.
2), when needing to measure therrmodynamic system plan mensuration sampling spot " the stifled index of colloidal state iron dirt ", open the first valve 1 and the 3rd valve 2, close the second valve 6.Cleaning down sampling slip 7 pipeline (now not installing miillpore filter).After sampling slip 7 flushing of pipeline, flowmeter resets or record current data, installs miillpore filter, allows water sample by miillpore filter, and record the integrated flux of water sample by filter membrane.
3) according to on-site actual situations, record the pressure reduction change under certain integrated flux, calculate ICFD
Δ Pnumerical value.That is: make water sample by the miillpore filter of equal area, same traffic, same apertures, the differential pressure change ICFD before and after unit of account area, specific discharge film
Δ Por weight ICFD
Δ m.
Computing formula is as follows:
In formula: Δ p-pressure reduction, Pa;
s-water sample by the useful area of miillpore filter, cm
2;
v-water sample by the integrated flux of miillpore filter, m
3; Δ m-water sample passes through forward and backward, the weightening finish of miillpore filter, g.Result of calculation is as follows:
AVT (R) processing mode Monitoring Data:
Oxidizing treatment mode Monitoring Data:
Claims (1)
1. a fuel-burning power plant unit thermodynamic system non-solubility iron content determinator, comprise the therrmodynamic system steam water sampling pipeline being provided with the first valve and the second valve, it is characterized in that, first, therrmodynamic system steam water sampling pipeline between two valves offers branch road, the other end of this branch road is connected on the therrmodynamic system steam water sampling pipeline after the second valve, the pipeline of described branch road is provided with in turn the 3rd valve, flowmeter and miillpore filter, bypass line between flowmeter and miillpore filter is provided with pressure difference transmitter, the other end of pressure difference transmitter be connected to miillpore filter after bypass line on.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931380A (en) * | 2015-06-12 | 2015-09-23 | 国网河南省电力公司电力科学研究院 | Method and device for measuring non-soluble iron content of thermodynamic system of thermal power plant unit |
| CN105424953A (en) * | 2015-11-18 | 2016-03-23 | 华北电力大学 | Equal state monitoring system and method for corrosion products in power station steam-water system working medium |
| CN108760560A (en) * | 2018-05-21 | 2018-11-06 | 山东京博石油化工有限公司 | A kind of method and device detecting the coke powder content in delayed coking acid water |
| CN109283090A (en) * | 2018-10-23 | 2019-01-29 | 河南省日立信股份有限公司 | Insolubles content on-line measuring device and method in circulation system water |
-
2015
- 2015-06-12 CN CN201520404026.2U patent/CN204649561U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931380A (en) * | 2015-06-12 | 2015-09-23 | 国网河南省电力公司电力科学研究院 | Method and device for measuring non-soluble iron content of thermodynamic system of thermal power plant unit |
| CN104931380B (en) * | 2015-06-12 | 2018-01-02 | 国网河南省电力公司电力科学研究院 | A kind of thermal power plant unit thermodynamic system non-solubility Methods For The Determination of Iron and device |
| CN105424953A (en) * | 2015-11-18 | 2016-03-23 | 华北电力大学 | Equal state monitoring system and method for corrosion products in power station steam-water system working medium |
| CN108760560A (en) * | 2018-05-21 | 2018-11-06 | 山东京博石油化工有限公司 | A kind of method and device detecting the coke powder content in delayed coking acid water |
| CN109283090A (en) * | 2018-10-23 | 2019-01-29 | 河南省日立信股份有限公司 | Insolubles content on-line measuring device and method in circulation system water |
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