CN109237459A - A kind of newly-built drum boiler chemical cleaning method - Google Patents
A kind of newly-built drum boiler chemical cleaning method Download PDFInfo
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- CN109237459A CN109237459A CN201811016100.8A CN201811016100A CN109237459A CN 109237459 A CN109237459 A CN 109237459A CN 201811016100 A CN201811016100 A CN 201811016100A CN 109237459 A CN109237459 A CN 109237459A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/52—Washing-out devices
Abstract
The invention discloses a kind of newly-built drum boiler chemical cleaning methods, the following steps are included: being detected after water flushing → rinsing → passivation → liquid waste processing → cleaning after water flushing → pickling → pickling after preparation → water flushing → alkali cleaning → alkali cleaning before chemical cleaning circuit installation → chemical cleaning, the invention has the benefit that this engineering method forms " the newly-built drum boiler chemical cleaning construction technology " of complete set, it offers reference to similar engineering in the future, using weak acid reagent --- citric acid common in the market, for chemical cleaning, to environmental hazard mild degree, improve work efficiency；In Process of Chemical Cleaning, a large amount of artificial mechanism machine-teams have been saved.
Description
Technical field
The present invention relates to cleaning boiler technical field more particularly to a kind of newly-built drum boiler chemical cleaning methods.
Background technique
Newly constructed boiler often will form rolled iron phosphorus in the fabrication process and usually exist with silicon iron scale, and when factory
Corrosion protection finish is coated in the equipment such as valve, long-term exposure air further corrodes metal surface, corrosion product is formed, if not thorough
Bottom is removed, and boiler tube generation underdeposit corrosion, water quality indicator can be made unqualified for a long time, so that extending new machine starts to normal operation
Time etc., currently, mature construction technology can not used for reference.
Summary of the invention
The present invention provides a kind of newly-built drum boiler chemical cleaning methods, form " the newly-built drum boiler chemistry of complete set
Chemical cleaning project technique " offers reference to similar engineering in the future, and use is common in the market, and weak acid reagent --- citric acid is used for
Chemical cleaning, to environmental hazard mild degree.
In order to solve the above technical problems, the embodiment of the present application provides a kind of newly-built drum boiler chemical cleaning method, including
Following steps:
S1, chemical cleaning circuit, installation
S11, chemical cleaning circuit is determined: cleaning case-cleaning pump-economizer-drum-water-cooling wall-cleaning case；
S12, selection clean cycle flow velocity and cleaning pump: water-cooling wall flow velocity should exist in 0.1 m/s~0.3m/s, economizer flow velocity
0.1 m/s~0.2m/s cleans pump discharge in 70t/h~210t/h, and pump lift should be greater than boiler drum hydrostatic position and system stream
The sum of dynamic resistance, cleaning the interim of selection should select flow for the clear of 100t/h into warp in acid and time sour main pipe not less than 100mm
Wash pump；
S13, connection temporary pipeline and economizer: it disconnects after boiler feedwater inlet check valve, before economizer lower header as interim
Pipe joint connects the temporary pipeline of a DN100；
S14, connection temporary pipeline and surrounding water-cooling wall: by decline guard system figure, DN100 is accessed on point four roads from down-comer hand hole
Interim pipeline, supplied water by dispersion down-comer to furnace wall cooling, and can satisfy the clear of water screen tube in cyclic process
Flow velocity is washed in 0.1m/s-0.3m/s requirement；
It is not connect before the formal water-level gauge pickling of S15, drum, valve connects, and connects the interim water-level gauge of lucite pipe of a Φ 32；
S16, drum overflow: drum accident discharge tube valve is closed；
S17, drum exhaust: boiler drum, which uses by oneself steam valve as drum exhaust pipe, prevents vent plug；
S18, drum internals: inside steam drum water separator is removed before chemical cleaning, in common downcomer mouth
It installs the restricting orifice of Φ 20 or so additional, and is reliably fixed using interim measure, caused to avoid cleaning solution by down-comer short
Road；
The supply of S19 water, electricity, vapour utility condition: demineralized water: circulation energy normal water supply, inlet valve before pickling
Disconnection connects the interim pipe of DN100 to cleaning case, pickling demineralized water about 80~100t/h；Steam: it is connect from low-pressure steam pipeline
The temporary pipeline of a piece Φ 57 × 3.5 is to cleaning case, it is desirable that and 220 DEG C of pressure 1.0Mpa, temperature need to keep the temperature, if temperature is inadequate,
Open torch oil gun auxiliary heating；Power supply: 380V, 22KW, it is uninterrupted to supply；
S110 temporary valve is mounted near 0 meter of cleaning case, and convenient for operation；With boiler in relation to link circulating line valve,
Equipment etc. is operated by the operator of construction party；
Preparation before S2, chemical cleaning
S2, chemical cleaning temporary system install, and the water pressure test for being 0.5Mpa by pressure, various rotating machinery examinations
It works well, and the test of boiler integral pressure normally finishes；
S22 storage, which is supplied water, is able to satisfy cleaning water consumption requirement；
S23, exhaust system are unimpeded, and sewage pump can start operation in time when discharge；
S24, participation chemical cleaning heating surface install, and carry out the water pressure test；
S25, the equipment for not participating in chemical cleaning and system should reliably be isolated with chemical cleaning solution, and accomplish:
1) water-level gauge and all Thermal Meters, sampling, medicine system should all be isolated with cleaning solution, and drum is equipped with interim water-level gauge；
2) superheater should take reliable quarantine measures, and superheater is isolated reliably with cleaning solution, to protect superheater；
3) steam pipe is used by oneself as air gate and cleaning exhaust valve using drum；
4) in order to maintain cleaning boiler liquid temperature, tight closure burner hearth and back-end ductwork is answered to export；
5) cleaning scene have communication equipment so as to master control, change water etc. and contact；
6) common downcomer installs restricting orifice, internal diameter Φ 20 additional in drum, and is reliably fixed；
7) chemical cleaning temporary system welding must be welded by formal pipeline, and temporary valve packing is tight, and cleaning pump packing is resistance to
Sour packing；
8) temporarily cleaning pumping source and control panel, protection installation and debugging finish, and power supply provides wiring position by Party A, and construction party is negative
Duty is supplied to interim cleaning pumping source control panel；
9) an interim medicine adding platform and staircase are taken in chemical cleaning case, dosing and operation when being cleaned；
10) interim pedestal is made in chemical cleaning pump and be placed on sleeper, in addition briquetting and bitch are fixed；
11) fixed cleaning pump, test run rotating motor is normal, and pump is connected to motor horizontal and center and complies with relevant regulations；
12) when cleaning, economizer recirculation (egr) valve aperture 5%~10%；The 15min before Cleaning and Passivation is completed, opens boiler bottom
All sewage doors, main water supply and economizer draining valve, economizer recycle wicket；
13) system without interaction that will likely be contacted with cleaning solution is reliably isolated；
14) 3 corrosion indicator weighings are taken, and are made a record, it is identical to make this 3 corrosion indicator weight, and in drum
2 corrosion indicators are hung, pickling solution preparation finishes, and 1 corrosion indicator is hung in cleaning case；
S3, it first with demineralized water rinses temporary system well, then carries out the water of formal system and rinse, irrigation flow rate 0.5m/s-
1.5m/s reaches transparent no-sundries as criterion of acceptability using terminal water outlet；
S4, alkali cleaning
S41 drug concentration requirement :+0.02~0.03% defoaming agent of 0.5~1% degreaser；
50~60 DEG C of S42 are cleaned 4~6 hours；
S43 opens steam heating in cyclic process and furnace coolant-temperature gage is increased to 50~60 DEG C, controls steam water-level in center line
Under, drug is added.When the medicament addition of calculation amount, and concentration basically reaches and stops dosing when requiring, and (liquid level is at drum center
Line), temperature reaches specified value；
Water rinses after S5, alkali cleaning, and demineralized water is rinsed to pH≤9, and water quality is transparent；
S6, pickling
S61, pre- inhibition: corrosion inhibiter and inhibitor, solution concentration is added are as follows: 0.2%~0.4% corrosion inhibiter+0.05%~
0.2% ferric ion corrosion inhibitor；
S62, citric acid is added, makes citric acid concentration 2%~4% in pickling solution, 80 DEG C~90 DEG C of temperature, time 6h~10h,
In Process of Chemical Cleaning, all citric acids should add within 2h；
Water rinses after S7, pickling, is rinsed with demineralized water, until outlet Σ Fe < 50mg/L, pH=5~6；
S8, rinsing: being added the lemon acid inhibitor of 0.1%~0.3%Cit+0.05%~0.1%, adjusts pH to 3.5 with ammonium hydroxide
~4,70-80 DEG C of temperature, time about 2h, if metal surface, can not in contact with air in washing time < 2h or water flushing process
Save rinsing process；
S9, using sodium nitrite passivation method, ammonium hydroxide adjusts pH=9~10, and matched proportion density is that 0.8%~1.5% sodium nitrite is molten
Liquid, 50 DEG C~60 DEG C passivation cycle 4h~6h；
S10, quick drain passivating solution keep water-cooling system dry.The water that water rinses, is discharged into acid-base neutralization pond, and cleaning waste liquid is added
With pH to 6~9 in ammonium hydroxide or sodium hydroxide, cesspool is discharged into after qualified；
It is detected after S11, cleaning
The measurement of 1 etching extent and corrosion rate
After passivating solution discharge, 3 test pieces hung in cleaning system are taken out, is put into after being rinsed immediately with clear water and adjusts pH with ammonium hydroxide
Value is quickly dried after taking-up, is placed into dehydrated alcohol, impregnate 1min ~ 2min to impregnate 1min ~ 2min in 9 ~ 10 demineralized water
It takes out and dries afterwards, be put into the air-tight bottle for filling desiccant, weigh, make a record after dry 2h；
1) etching extent is calculated according to the following formula, i.e.,
W=(m1-m2)/S
W --- etching extent, g/m2
Quality before m1 --- test piece is tested, g
M2 --- quality after test piece test, g
S --- strip product, m2
2) corrosion rate is calculated according to the following formula, i.e.,
V=(m1-m2)/St
V --- corrosion rate, g/(m2.h)
Quality before m1 --- test piece is tested, g
M2 --- quality after test piece test, g
S --- strip product, m2
T --- reaction time, h
The remaining dirt amount of 2 measurements
Dirt is extracted before chemical cleaning and measures maximum water screen tube, weighs pipe sample quality, and measurement pipe sample internal surface area, pipe sample is soaked
Enter in 2%~4% citric acid solution added with 0.2%~0.4% corrosion inhibiter, is heated to 80 DEG C~90 DEG C, time and normally acid
Time consistency during washing, after use demineralized water flushing pipe sample, then pipe sample is placed in dehydrated alcohol and rocks taking-up and dries, put
Enter to fill in the air-tight bottle of desiccant, weigh, make a record after dry 1h, remaining dirt amount is calculated according to the following formula, i.e.,
G=(W1-W2-G1)/S
G --- pipe sample dirt amount, g/m2
W1 --- pipe sample initial mass, g
W2 --- pipe sample quality after pickling, g
G1 --- pipe sample etching extent, g can be calculated according to 5.2.11.1
S --- pipe sample internal surface area, m2.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
This engineering method forms " the newly-built drum boiler chemical cleaning construction technology " of complete set, offers reference to similar engineering in the future,
Using weak acid reagent common in the market --- citric acid improves work efficiency to environmental hazard mild degree for chemical cleaning；
In Process of Chemical Cleaning, a large amount of artificial mechanism machine-teams have been saved.
Specific embodiment
In order to better understand the above technical scheme, specific embodiment carries out above-mentioned technical proposal below detailed
Explanation.
A kind of newly-built drum boiler chemical cleaning method described in the present embodiment, comprising the following steps:
S1, chemical cleaning circuit, installation
S11, chemical cleaning circuit is determined: cleaning case-cleaning pump-economizer-drum-water-cooling wall-cleaning case；
S12, selection clean cycle flow velocity and cleaning pump: water-cooling wall flow velocity should exist in 0.1 m/s~0.3m/s, economizer flow velocity
0.1 m/s~0.2m/s cleans pump discharge in 70t/h~210t/h, and pump lift should be greater than boiler drum hydrostatic position and system stream
The sum of dynamic resistance, cleaning the interim of selection should select flow for the clear of 100t/h into warp in acid and time sour main pipe not less than 100mm
Wash pump；
S13, connection temporary pipeline and economizer: it disconnects after boiler feedwater inlet check valve, before economizer lower header as interim
Pipe joint connects the temporary pipeline of a DN100；
S14, connection temporary pipeline and surrounding water-cooling wall: by decline guard system figure, DN100 is accessed on point four roads from down-comer hand hole
Interim pipeline, supplied water by dispersion down-comer to furnace wall cooling, and can satisfy the clear of water screen tube in cyclic process
Flow velocity is washed in 0.1m/s-0.3m/s requirement；
It is not connect before the formal water-level gauge pickling of S15, drum, valve connects, and connects the interim water-level gauge of lucite pipe of a Φ 32；
S16, drum overflow: drum accident discharge tube valve is closed；
S17, drum exhaust: boiler drum, which uses by oneself steam valve as drum exhaust pipe, prevents vent plug；
S18, drum internals: inside steam drum water separator is removed before chemical cleaning, in common downcomer mouth
It installs the restricting orifice of Φ 20 or so additional, and is reliably fixed using interim measure, caused to avoid cleaning solution by down-comer short
Road；
The supply of S19 water, electricity, vapour utility condition: demineralized water: circulation energy normal water supply, inlet valve before pickling
Disconnection connects the interim pipe of DN100 to cleaning case, pickling demineralized water about 80~100t/h；Steam: it is connect from low-pressure steam pipeline
The temporary pipeline of a piece Φ 57 × 3.5 is to cleaning case, it is desirable that and 220 DEG C of pressure 1.0Mpa, temperature need to keep the temperature, if temperature is inadequate,
Open torch oil gun auxiliary heating；Power supply: 380V, 22KW, it is uninterrupted to supply；
S110 temporary valve is mounted near 0 meter of cleaning case, and convenient for operation；With boiler in relation to link circulating line valve,
Equipment etc. is operated by the operator of construction party；
Preparation before S2, chemical cleaning
S2, chemical cleaning temporary system install, and the water pressure test for being 0.5Mpa by pressure, various rotating machinery examinations
It works well, and the test of boiler integral pressure normally finishes；
S22 storage, which is supplied water, is able to satisfy cleaning water consumption requirement；
S23, exhaust system are unimpeded, and sewage pump can start operation in time when discharge；
S24, participation chemical cleaning heating surface install, and carry out the water pressure test；
S25, the equipment for not participating in chemical cleaning and system should reliably be isolated with chemical cleaning solution, and accomplish:
1) water-level gauge and all Thermal Meters, sampling, medicine system should all be isolated with cleaning solution, and drum is equipped with interim water-level gauge；
2) superheater should take reliable quarantine measures, and superheater is isolated reliably with cleaning solution, to protect superheater；
3) steam pipe is used by oneself as air gate and cleaning exhaust valve using drum；
4) in order to maintain cleaning boiler liquid temperature, tight closure burner hearth and back-end ductwork is answered to export；
5) cleaning scene have communication equipment so as to master control, change water etc. and contact；
6) common downcomer installs restricting orifice, internal diameter Φ 20 additional in drum, and is reliably fixed；
7) chemical cleaning temporary system welding must be welded by formal pipeline, and temporary valve packing is tight, and cleaning pump packing is resistance to
Sour packing；
8) temporarily cleaning pumping source and control panel, protection installation and debugging finish, and power supply provides wiring position by Party A, and construction party is negative
Duty is supplied to interim cleaning pumping source control panel；
9) an interim medicine adding platform and staircase are taken in chemical cleaning case, dosing and operation when being cleaned；
10) interim pedestal is made in chemical cleaning pump and be placed on sleeper, in addition briquetting and bitch are fixed；
11) fixed cleaning pump, test run rotating motor is normal, and pump is connected to motor horizontal and center and complies with relevant regulations.
12) when cleaning, economizer recirculation (egr) valve aperture 5%~10%；The 15min before Cleaning and Passivation is completed, opens boiler
All sewage doors in bottom, main water supply and economizer draining valve, economizer recycle wicket；
13) system without interaction that will likely be contacted with cleaning solution is reliably isolated；
14) 3 corrosion indicator weighings are taken, and are made a record, it is identical to make this 3 corrosion indicator weight, and in drum
2 corrosion indicators are hung, pickling solution preparation finishes, and 1 corrosion indicator is hung in cleaning case；
S3, it first with demineralized water rinses temporary system well, then carries out the water of formal system and rinse, irrigation flow rate 0.5m/s-
1.5m/s reaches transparent no-sundries as criterion of acceptability using terminal water outlet；
S4, alkali cleaning
S41 drug concentration requirement :+0.02~0.03% defoaming agent of 0.5~1% degreaser；
50~60 DEG C of S42 are cleaned 4~6 hours；
S43 opens steam heating in cyclic process and furnace coolant-temperature gage is increased to 50~60 DEG C, controls steam water-level in center line
Under, drug is added.When the medicament addition of calculation amount, and concentration basically reaches and stops dosing when requiring, and (liquid level is at drum center
Line), temperature reaches specified value；
Water rinses after S5, alkali cleaning, and demineralized water is rinsed to pH≤9, and water quality is transparent；
S6, pickling
S61, pre- inhibition: corrosion inhibiter and inhibitor, solution concentration is added are as follows: 0.2%~0.4% corrosion inhibiter+0.05%~
0.2% ferric ion corrosion inhibitor；
S62, citric acid is added, makes citric acid concentration 2%~4% in pickling solution, 80 DEG C~90 DEG C of temperature, time 6h~10h,
In Process of Chemical Cleaning, all citric acids should add within 2h；
Water rinses after S7, pickling, is rinsed with demineralized water, until outlet Σ Fe < 50mg/L, pH=5~6.
S8, rinsing: be added the lemon acid inhibitor of 0.1%~0.3%Cit+0.05%~0.1%, with ammonium hydroxide adjust pH to
3.5~4,70-80 DEG C of temperature, time about 2h, if metal surface is not in contact with air in washing time < 2h or water flushing process,
Rinsing process can be saved；
S9, using sodium nitrite passivation method, ammonium hydroxide adjusts pH=9~10, and matched proportion density is that 0.8%~1.5% sodium nitrite is molten
Liquid, 50 DEG C~60 DEG C passivation cycle 4h~6h；
S10, quick drain passivating solution keep water-cooling system dry.The water that water rinses, is discharged into acid-base neutralization pond, and cleaning waste liquid is added
With pH to 6~9 in ammonium hydroxide or sodium hydroxide, cesspool is discharged into after qualified；
It is detected after S11, cleaning
The measurement of 1 etching extent and corrosion rate
After passivating solution discharge, 3 test pieces hung in cleaning system are taken out, is put into after being rinsed immediately with clear water and adjusts pH with ammonium hydroxide
Value is quickly dried after taking-up, is placed into dehydrated alcohol, impregnate 1min ~ 2min to impregnate 1min ~ 2min in 9 ~ 10 demineralized water
It takes out and dries afterwards, be put into the air-tight bottle for filling desiccant, weigh, make a record after dry 2h；
1) etching extent is calculated according to the following formula, i.e.,
W=(m1-m2)/S
W --- etching extent, g/m2
Quality before m1 --- test piece is tested, g
M2 --- quality after test piece test, g
S --- strip product, m2
2) corrosion rate is calculated according to the following formula, i.e.,
V=(m1-m2)/St
V --- corrosion rate, g/(m2.h)
Quality before m1 --- test piece is tested, g
M2 --- quality after test piece test, g
S --- strip product, m2
T --- reaction time, h
The remaining dirt amount of 2 measurements.Dirt is extracted before chemical cleaning and measures maximum water screen tube, weighs pipe sample quality, and in measurement pipe sample
Pipe sample is immersed in 2%~4% citric acid solution added with 0.2%~0.4% corrosion inhibiter, is heated to 80 DEG C~90 by surface area
DEG C, time consistency in time and normal acid cleaning process, after use demineralized water flushing pipe sample, then pipe sample is placed in dehydrated alcohol
It rocks taking-up to dry, be put into the air-tight bottle for filling desiccant, weigh, make a record after dry 1h, remaining dirt amount presses following public affairs
Formula calculates, i.e.,
G=(W1-W2-G1)/S
G --- pipe sample dirt amount, g/m2
W1 --- pipe sample initial mass, g
W2 --- pipe sample quality after pickling, g
G1 --- pipe sample etching extent, g can be calculated according to 5.2.11.1
S --- pipe sample internal surface area, m2.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this profession
Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification
For the equivalent embodiment of equivalent variations, but anything that does not depart from the technical scheme of the invention content, according to the technical essence of the invention
Any simple modification, equivalent change and modification to the above embodiments, all of which are still within the scope of the technical scheme of the invention.
Claims (1)
1. a kind of newly-built drum boiler chemical cleaning method, which comprises the following steps:
S1, chemical cleaning circuit, installation
S11, chemical cleaning circuit is determined: cleaning case-cleaning pump-economizer-drum-water-cooling wall-cleaning case；
S12, selection clean cycle flow velocity and cleaning pump: water-cooling wall flow velocity should exist in 0.1 m/s~0.3m/s, economizer flow velocity
0.1 m/s~0.2m/s cleans pump discharge in 70t/h~210t/h, and pump lift should be greater than boiler drum hydrostatic position and system stream
The sum of dynamic resistance, cleaning the interim of selection should select flow for the clear of 100t/h into warp in acid and time sour main pipe not less than 100mm
Wash pump；
S13, connection temporary pipeline and economizer: it disconnects after boiler feedwater inlet check valve, before economizer lower header as interim
Pipe joint connects the temporary pipeline of a DN100；
S14, connection temporary pipeline and surrounding water-cooling wall: by decline guard system figure, DN100 is accessed on point four roads from down-comer hand hole
Interim pipeline, supplied water by dispersion down-comer to furnace wall cooling, and can satisfy the clear of water screen tube in cyclic process
Flow velocity is washed in 0.1m/s-0.3m/s requirement；
It is not connect before the formal water-level gauge pickling of S15, drum, valve connects, and connects the interim water-level gauge of lucite pipe of a Φ 32；
S16, drum overflow: drum accident discharge tube valve is closed；
S17, drum exhaust: boiler drum, which uses by oneself steam valve as drum exhaust pipe, prevents vent plug；
S18, drum internals: inside steam drum water separator is removed before chemical cleaning, in common downcomer mouth
It installs the restricting orifice of Φ 20 or so additional, and is reliably fixed using interim measure, caused to avoid cleaning solution by down-comer short
Road；
The supply of S19 water, electricity, vapour utility condition: demineralized water: circulation energy normal water supply, inlet valve before pickling
Disconnection connects the interim pipe of DN100 to cleaning case, pickling demineralized water about 80~100t/h；Steam: it is connect from low-pressure steam pipeline
The temporary pipeline of a piece Φ 57 × 3.5 is to cleaning case, it is desirable that and 220 DEG C of pressure 1.0Mpa, temperature need to keep the temperature, if temperature is inadequate,
Open torch oil gun auxiliary heating；Power supply: 380V, 22KW, it is uninterrupted to supply；
S110 temporary valve is mounted near 0 meter of cleaning case, and convenient for operation；With boiler in relation to link circulating line valve,
Equipment etc. is operated by the operator of construction party；
Preparation before S2, chemical cleaning
S2, chemical cleaning temporary system install, and the water pressure test for being 0.5Mpa by pressure, various rotating machinery examinations
It works well, and the test of boiler integral pressure normally finishes；
S22 storage, which is supplied water, is able to satisfy cleaning water consumption requirement；
S23, exhaust system are unimpeded, and sewage pump can start operation in time when discharge；
S24, participation chemical cleaning heating surface install, and carry out the water pressure test；
S25, the equipment for not participating in chemical cleaning and system should reliably be isolated with chemical cleaning solution, and accomplish:
1) water-level gauge and all Thermal Meters, sampling, medicine system should all be isolated with cleaning solution, and drum is equipped with interim water-level gauge；
2) superheater should take reliable quarantine measures, and superheater is isolated reliably with cleaning solution, to protect superheater；
3) steam pipe is used by oneself as air gate and cleaning exhaust valve using drum；
4) in order to maintain cleaning boiler liquid temperature, tight closure burner hearth and back-end ductwork is answered to export；
5) cleaning scene have communication equipment so as to master control, change water etc. and contact；
6) common downcomer installs restricting orifice, internal diameter Φ 20 additional in drum, and is reliably fixed；
7) chemical cleaning temporary system welding must be welded by formal pipeline, and temporary valve packing is tight, and cleaning pump packing is resistance to
Sour packing；
8) temporarily cleaning pumping source and control panel, protection installation and debugging finish, and power supply provides wiring position by Party A, and construction party is negative
Duty is supplied to interim cleaning pumping source control panel；
9) an interim medicine adding platform and staircase are taken in chemical cleaning case, dosing and operation when being cleaned；
10) interim pedestal is made in chemical cleaning pump and be placed on sleeper, in addition briquetting and bitch are fixed；
11) fixed cleaning pump, test run rotating motor is normal, and pump is connected to motor horizontal and center and complies with relevant regulations；
12) when cleaning, economizer recirculation (egr) valve aperture 5%~10%；The 15min before Cleaning and Passivation is completed, opens boiler bottom
All sewage doors, main water supply and economizer draining valve, economizer recycle wicket；
13) system without interaction that will likely be contacted with cleaning solution is reliably isolated；
14) 3 corrosion indicator weighings are taken, and are made a record, it is identical to make this 3 corrosion indicator weight, and in drum
2 corrosion indicators are hung, pickling solution preparation finishes, and 1 corrosion indicator is hung in cleaning case；
S3, it first with demineralized water rinses temporary system well, then carries out the water of formal system and rinse, irrigation flow rate 0.5m/s-
1.5m/s reaches transparent no-sundries as criterion of acceptability using terminal water outlet；
S4, alkali cleaning
S41 drug concentration requirement :+0.02~0.03% defoaming agent of 0.5~1% degreaser；
50~60 DEG C of S42 are cleaned 4~6 hours；
S43 opens steam heating in cyclic process and furnace coolant-temperature gage is increased to 50~60 DEG C, controls steam water-level in center line
Under, drug is added；
When the medicament addition of calculation amount, and concentration basically reaches and stops dosing when requiring, and (liquid level is in drum center line), temperature reaches
Specified value；
Water rinses after S5, alkali cleaning, and demineralized water is rinsed to pH≤9, and water quality is transparent；
S6, pickling
S61, pre- inhibition: corrosion inhibiter and inhibitor, solution concentration is added are as follows: 0.2%~0.4% corrosion inhibiter+0.05%~
0.2% ferric ion corrosion inhibitor；
S62, citric acid is added, makes citric acid concentration 2%~4% in pickling solution, 80 DEG C~90 DEG C of temperature, time 6h~10h,
In Process of Chemical Cleaning, all citric acids should add within 2h；
Water rinses after S7, pickling, is rinsed with demineralized water, until outlet Σ Fe < 50mg/L, pH=5~6；
S8, rinsing: being added the lemon acid inhibitor of 0.1%~0.3%Cit+0.05%~0.1%, adjusts pH to 3.5 with ammonium hydroxide
~4,70-80 DEG C of temperature, time about 2h, if metal surface, can not in contact with air in washing time < 2h or water flushing process
Save rinsing process；
S9, using sodium nitrite passivation method, ammonium hydroxide adjusts pH=9~10, and matched proportion density is that 0.8%~1.5% sodium nitrite is molten
Liquid, 50 DEG C~60 DEG C passivation cycle 4h~6h；
S10, quick drain passivating solution keep water-cooling system dry；
The water that water rinses is discharged into acid-base neutralization pond, and cleaning waste liquid is added in ammonium hydroxide or sodium hydroxide and pH to 6~9, qualified heel row
Enter cesspool；
It is detected after S11, cleaning
The measurement of 1 etching extent and corrosion rate
After passivating solution discharge, 3 test pieces hung in cleaning system are taken out, is put into after being rinsed immediately with clear water and adjusts pH with ammonium hydroxide
Value is quickly dried after taking-up, is placed into dehydrated alcohol, impregnate 1min ~ 2min to impregnate 1min ~ 2min in 9 ~ 10 demineralized water
It takes out and dries afterwards, be put into the air-tight bottle for filling desiccant, weigh, make a record after dry 2h；
1) etching extent is calculated according to the following formula, i.e.,
W=(m1-m2)/S
W --- etching extent, g/m2
Quality before m1 --- test piece is tested, g
M2 --- quality after test piece test, g
S --- strip product, m2
2) corrosion rate is calculated according to the following formula, i.e.,
V=(m1-m2)/St
V --- corrosion rate, g/(m2.h)
Quality before m1 --- test piece is tested, g
M2 --- quality after test piece test, g
S --- strip product, m2
T --- reaction time, h
The remaining dirt amount of 2 measurements
Dirt is extracted before chemical cleaning and measures maximum water screen tube, weighs pipe sample quality, and measurement pipe sample internal surface area, pipe sample is soaked
Enter in 2%~4% citric acid solution added with 0.2%~0.4% corrosion inhibiter, is heated to 80 DEG C~90 DEG C, time and normally acid
Time consistency during washing, after use demineralized water flushing pipe sample, then pipe sample is placed in dehydrated alcohol and rocks taking-up and dries, put
Enter to fill in the air-tight bottle of desiccant, weigh, make a record after dry 1h, remaining dirt amount is calculated according to the following formula, i.e.,
G=(W1-W2-G1)/S
G --- pipe sample dirt amount, g/m2
W1 --- pipe sample initial mass, g
W2 --- pipe sample quality after pickling, g
G1 --- pipe sample etching extent, g can be calculated according to 5.2.11.1
S --- pipe sample internal surface area, m2.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111396853A (en) * | 2020-04-12 | 2020-07-10 | 南通中意锅炉设备有限公司 | Descaling method for steam boiler |
| CN111593355A (en) * | 2020-05-12 | 2020-08-28 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Method for cleaning boiler of thermal power plant |
| CN111928217A (en) * | 2020-06-08 | 2020-11-13 | 五冶集团上海有限公司 | 500m2Alkali boiling construction method for waste heat boiler of sintering plant |
| CN111947958A (en) * | 2020-08-17 | 2020-11-17 | 苏州英睿派机电科技有限公司 | Method for processing and maintaining equipment damaged by smoking |
| CN112495953A (en) * | 2020-12-23 | 2021-03-16 | 华能山东石岛湾核电有限公司 | Method for cleaning main steam pipeline of high-temperature reactor |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101498004A (en) * | 2008-11-21 | 2009-08-05 | 宁夏电力科技教育工程院 | Chemical scrubbing method for boiler |
| CN101575708A (en) * | 2009-01-22 | 2009-11-11 | 湖南省湘电试验研究院有限公司 | Washing liquid applied to station boiler and washing method |
| CN102418104A (en) * | 2011-12-13 | 2012-04-18 | 长沙市中蓝清洗技术有限公司 | Chemical for cleaning boiler, using method and cleaning device thereof |
| CN104726881A (en) * | 2015-02-12 | 2015-06-24 | 国家电网公司 | Efficient environment-friendly chemical cleaning method |
| CN107747728A (en) * | 2017-10-24 | 2018-03-02 | 广州市金润环保科技有限公司 | A kind of cleaning method of boiler |
| CN108383187A (en) * | 2018-05-10 | 2018-08-10 | 西安热工研究院有限公司 | A kind of station boiler citric acid wastewater enrichment facility and application method |
-
2018
- 2018-09-02 CN CN201811016100.8A patent/CN109237459B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101498004A (en) * | 2008-11-21 | 2009-08-05 | 宁夏电力科技教育工程院 | Chemical scrubbing method for boiler |
| CN101575708A (en) * | 2009-01-22 | 2009-11-11 | 湖南省湘电试验研究院有限公司 | Washing liquid applied to station boiler and washing method |
| CN102418104A (en) * | 2011-12-13 | 2012-04-18 | 长沙市中蓝清洗技术有限公司 | Chemical for cleaning boiler, using method and cleaning device thereof |
| CN104726881A (en) * | 2015-02-12 | 2015-06-24 | 国家电网公司 | Efficient environment-friendly chemical cleaning method |
| CN107747728A (en) * | 2017-10-24 | 2018-03-02 | 广州市金润环保科技有限公司 | A kind of cleaning method of boiler |
| CN108383187A (en) * | 2018-05-10 | 2018-08-10 | 西安热工研究院有限公司 | A kind of station boiler citric acid wastewater enrichment facility and application method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111396853A (en) * | 2020-04-12 | 2020-07-10 | 南通中意锅炉设备有限公司 | Descaling method for steam boiler |
| CN111593355A (en) * | 2020-05-12 | 2020-08-28 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Method for cleaning boiler of thermal power plant |
| CN111928217A (en) * | 2020-06-08 | 2020-11-13 | 五冶集团上海有限公司 | 500m2Alkali boiling construction method for waste heat boiler of sintering plant |
| CN111947958A (en) * | 2020-08-17 | 2020-11-17 | 苏州英睿派机电科技有限公司 | Method for processing and maintaining equipment damaged by smoking |
| CN112495953A (en) * | 2020-12-23 | 2021-03-16 | 华能山东石岛湾核电有限公司 | Method for cleaning main steam pipeline of high-temperature reactor |
| CN116067220A (en) * | 2023-01-31 | 2023-05-05 | 内蒙古大全新能源有限公司 | Cleaning method suitable for heat exchanger for semiconductor grade polysilicon production |
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