CN107747728A - A kind of cleaning method of boiler - Google Patents
A kind of cleaning method of boiler Download PDFInfo
- Publication number
- CN107747728A CN107747728A CN201711011217.2A CN201711011217A CN107747728A CN 107747728 A CN107747728 A CN 107747728A CN 201711011217 A CN201711011217 A CN 201711011217A CN 107747728 A CN107747728 A CN 107747728A
- Authority
- CN
- China
- Prior art keywords
- boiler
- water
- cleaning
- soda boiling
- drum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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 cleaning method of boiler provided by the invention includes removal of impurities and rinses soda boiling flushing pickling acid solution top row and water flushing rinsing passivation.The present invention is reacted using soda boiling liquid with boiler inner wall greasy dirt, thoroughly removes greasy dirt, and soda boiling liquid of the invention is free of inorganic phosphate, reduces blowdown flow rate；The present invention is during pickling, reacted using the incrustation scale, copper dirt and iron rust of acid and boiler inner wall, dissolve the incrustation scale and iron rust of boiler and inner-walls of duct, poly-aspartate in pickle has good scale prevention ability, can effectively prevent the generation of calcium salt, and 1-hydroxy ethylidene-1,1-diphosphonic acid has peptizaiton, the calcium ions and magnesium ions in water can be stablized, corrosion inhibiter on the one hand can effectively disperse and scale inhibition, and impurity is not on the other hand introduced into steam generator system, reduces the blowdown flow rate of cleaning boiler；Passivating solution provided by the invention is organic passivation liquid, and chemical reaction generation passivating film can occur with boiler inner wall, do not produce ammonium ion, avoid causing ammonia corrosion to boiler.
Description
Technical field
The invention belongs to boiler water treatment field, and in particular to a kind of cleaning method of boiler.
Background technology
In daily industrial production, boiler feed water is constantly circulated and concentrated when in use, and the content of mineral substances in water can not yet
Disconnected increase, so as to cause the fouling of furnace body wall fire tube, oxygen corrosion.Furnace body wall fire tube scales once tying, and will substantially reduce heat exchange
Efficiency, boiler can accelerate oxygen corrosion, and the result of boiler oxygen corrosion makes metal surface activation, in Fe3+、Fe2+State, and Fe3+、Fe2 +、Fe、OH-Electrochemical corrosion between ion is even more serious, if things go on like this, will shorten boiler service life, jeopardizes safety in production.
Therefore, the furnace body wall fire tube of boiler must be handled periodically.Common dirty species has carbonate deposit, sulfuric acid salt solution
Dirt, silicate scale, mixing incrustation scale, Ferric oxide scale, carbon black, carbide and grease etc..The Chemical cleaning of boiler be make boiler by
Hot inner surfaces cleaning, prevent heated inner surface from causing the requisite measure of accident because of corrosion and fouling, while be also to improve boiler hot
One of efficiency, the effective measures for improving unit water and steam quality；Main purpose be exactly in order to remove newly constructed boiler rolling, it is processed
The high-temperature oxydation formed in journey rolls skin and caused corrosion product, welding slag and silt particle etc. in storage, transport, installation process
Dirt, water and steam quality is qualified as early as possible after ensureing unit starting；Differ currently for the cleaning means of boiler, less effective, due to
Inorganic phosphate such as tertiary sodium phosphate largely is used in cleaning process, the blowdown flow rate of cleaning is big, causes using ammoniacal liquor to adjust pH
Under different temperatures, the solubility of ammoniacal liquor changes, and local pH difference occurs.
The content of the invention
In order to solve the above technical problems, the present invention provides a kind of cleaning method of boiler, this method cleaning efficiency is high, no
Using inorganic phosphate, blowdown flow rate is reduced, without using ammoniacal liquor, avoids result in different parts pH differences.
It is an object of the invention to provide a kind of cleaning method of boiler.
According to the cleaning method of the boiler of the specific embodiment of the invention, comprise the following steps：
(1) clean：The debris first cleared up in boiler；
(2) rinse：First boiler-steam dome, down-comer, economizer, water-cooling wall, lower collecting box and connecting tube are rinsed with demineralized water
Road, debris therein is rinsed well, rinsed to the transparent clarification of saliva is gone out, then keep boiler seal, improve pressure to boiler
1.25-1.3 times of operating pressure, check boiler seal performance；
(3) soda boiling：Soda boiling liquid is prepared, soda boiling is carried out to flushed boiler, wherein the soda boiling liquid includes Na2CO3
0.2-0.4%, NaHCO30.2-0.6%, cetylamine 0.5-1%, wetting agent 0.02-0.05%, surplus are water,
Soda boiling liquid is added in boiler, when water level to 2/5-1/2 positions in drum, stops adding soda boiling liquid, is sealed into
Row heat temperature raising, air gate is closed after the pressure in boiler reaches 0.1-0.15MPa, carry out following three step boils furnaceman's work：
1. boosting to 0.4-0.5Mpa pressures tightens door to access bolt；
2. boosting to 1/2 boiler working pressure, kept for 36-48 hours, it is middle to each sewage door of lower collecting box blowdown 2-3 one by one
Secondary, valve wide open keeps 30-60s；
3. after softening water is simultaneously maintained to boiler progress bottom blow-down and surface blow-off, the total alkalinity for changing water to boiler water
10-12mmol/L, soda boiling terminate；
During soda boiling, a total alkalinity concentration is analyzed per 2-3h, soda boiling liquid is supplemented when total alkalinity is less than 45mmol/L,
The total alkalinity of soda boiling liquid is kept to be not less than 45mmol/L；
(4) rinse：The boiler of step (3) alkali cleaning is rinsed using demineralized water, rinsed to going out the transparent clarification of saliva,
Precipitated without particle；
(5) pickling：The boiler flushed to step (4) carries out pickling, prepares pickle, and the pickle includes HCl 4-
8%, poly-aspartate 0.2-0.5%, 1-hydroxy ethylidene-1,1-diphosphonic acid 0.3-0.6%, corrosion inhibiter 0.3-0.8%, defoamer 0.01-
0.02%, reducing agent 0.01-0.02%, surplus is water,
Wherein described acid cleaning process comprises the following steps：
1. adding protection liquid into boiler, the protection liquid is hydrazine hydrate solution, and the concentration of the hydrazine hydrate solution is
200-300mg/L；
2. rise boiler pressure to 1.25-1.3 times of operating pressure, checks the sealing property of boiler；
3. putting into steam into the first loop and second servo loop, 48-52 DEG C is warming up to,
First loop is：Drum → down-comer → lower collecting box → water-cooling wall → drum,
The second servo loop is：Drum → economizer → drum；
4. steam is launched into cleaning case, according to the water in tertiary circuit circulating-heating boiler, in loop to be recycled
When water temperature reaches 50-55 DEG C, the Hybrid Heating in closing cleaning case, cleaning case and drum are adjusted to minimum operation water level, it is described
Tertiary circuit is：Cleaning case → economizer → lower collecting box → water-cooling wall → drum → cleaning case；
Mordant is added in cleaning case, the surface heating in cleaning case is adjusted, controls rinse liquid temperature at 50-55 DEG C,
Steam water-level is controlled in ± 100mm, pipe inspection is monitored after cleaning 5-6 hours, when monitoring pipe is cleaned, and iron concentration
For excursion between ± 100mg/L, acidity excursion terminates pickling between ± 0.1% after recycling 1-1.5h；
(6) acid solution top row and water rinse：After pickling terminates, with demineralized water by cleaning fluid top row to neutralization pond, then with removing
Normal saline washing extremely exports water quality clear, no fine particle, and Fe2+And Fe3+Total concentration<50mg/l, pH>4.5；
(7) rinse：After acid solution top row and water flushing terminate, launch auxiliary steam to cleaning case and heat, followed by tertiary circuit
Ring heating furnace water is warming up to 45-50 DEG C, and citric acid is added in cleaning case, and the concentration of the citric acid is 0.3-0.4%, and adds
It is 3.5-4 to enter organic amine boiler water adjustment pH, the circulation rinsing 2-2.5h at a temperature of 73-75 DEG C；
(8) it is passivated：Passivating solution is added into cleaning case, the passivating solution is：Acetoxime 0.4-0.6%, hydrogen peroxide 0.3-
0.5%, melamine 0.5-0.8%, polyacrylamide 0.1-0.2%, ethylenediamine 0.5-1%, surplus are water, are heated to 40-
45 DEG C, the circulation passivation 5.5-6.5h in tertiary circuit, treat to be formed after one layer of passivating film on boiler inner wall, stop passivation, put
Go out passivating solution, that is, complete the cleaning boiler.
The cleaning method of boiler provided by the invention includes removal of impurities-flushing-soda boiling-flushing-pickling-acid solution top row and water
Flushing-rinsing-passivation, the larger impurity in steam generator system is removed first, then rinsed using demineralized water clear to saliva is gone out
It is clear bright, the iron rust of boiler inner wall surface adhesion is removed；Then the soda boiling under certain conditions of soda boiling liquid is added, utilizes soda boiling
Liquid reacts with boiler inner wall greasy dirt, thoroughly removes greasy dirt, and soda boiling liquid of the invention is free of inorganic phosphate, reduces blowdown
Amount；Then rinse well；Pickling is carried out in next step, and during pickling, the present invention is existed using pickle according to two loops
Pickling is carried out under conditions of certain, is reacted using the incrustation scale, copper dirt and iron rust of acid and boiler inner wall, dissolves boiler and pipe
The incrustation scale and iron rust of road inwall, are first handled steam generator system before pickling using hydrazine hydrate, remove the dissolved oxygen in water
Gas and carbon dioxide, the formation of iron dirt and copper dirt is prevented, the poly-aspartate in pickle has good scale prevention ability, can
The generation of calcium salt is effectively prevented, 1-hydroxy ethylidene-1,1-diphosphonic acid has peptizaiton, can stablize the calcium ions and magnesium ions in water, corrosion inhibiter one
Aspect can effectively disperse and scale inhibition, and impurity is not on the other hand introduced into steam generator system, reduces the blowdown flow rate of cleaning boiler；
Pickling removes steam generator system with demineralized water later；Then boiler is rinsed, using citric acid and organic amine to steam generator system
Rinsed, rinse and may be produced in metal surface using the iron ion in the complexing power removal steam generator system of citric acid and water
Raw iron rust, to create conditions in next step, the pH of stable regulation boiler water is capable of in the addition of organic amine；Boiler is by cleaning
Afterwards, the metal active of inwall, easily by anticaustic, therefore processing, passivation provided by the invention are passivated to it in next step
Liquid is organic passivation liquid, and chemical reaction generation passivating film can occur with boiler inner wall, meanwhile, ammonium ion is not produced, is avoided pair
Boiler causes ammonia corrosion, reduces blowdown flow rate.
According to the cleaning method of the boiler of the specific embodiment of the invention, it is preferable that methods described also includes sewage disposal,
The sewage disposal comprises the following steps：
(1) caused sewage during collection cleaning boiler, it is preferable that activated carbon is added into sewage, adjusts pH to 6-
9；
(2) the neutral sewage in step (1) is sterilized, flocculation sediment removes impurity and scrap iron therein；
(3) the progress nanofiltration of obtained supernatant is removed into salt treatment, obtains handling water.
The sewage that can not directly discharge can be produced during cleaning boiler, in order to avoid sewage pollution environment, the present invention are right
Caused sewage is handled, and is firstly added activated carbon physical absorption, removes particulate matter therein, then adjusts sewage
PH, then sterilizes, flocculates, precipitation, further removes the polluter in sewage, then supernatant is carried out at nanofiltration desalination
Reason, finally give the processing water of qualified discharge.
According to the cleaning method of the boiler of the specific embodiment of the invention, it is preferable that the electrical conductivity of the demineralized water is less than
100μs/cm。
Using the demineralized water that electrical conductivity is low in the present invention, cleaning of the impurity too high in demineralized water to boiler is avoided to cause to bear
Load.
According to the cleaning method of the boiler of the specific embodiment of the invention, it is preferable that in step (5), the corrosion inhibiter is adjacent
Dimethylbenzene thiocarbamide.
The molecule of o-xylene thiourea can be adsorbed in metal surface, and one layer of very thin protection of protection is formed in boiler inner wall
Film, mitigate the corrosion of boiler wall.
According to the cleaning method of the boiler of the specific embodiment of the invention, it is preferable that step (5) 1. in, the protection liquid
PH be 9.8-10.2.
According to the cleaning method of the boiler of the specific embodiment of the invention, it is preferable that step (5) 4. in, in acid cleaning process
In work as Fe3+>During 1000mg/L, adding reducing agent reduces Fe3+Concentration, make Fe3+Concentration is less than 750mg/L.
Boiler, due to the dissolving of incrustation scale, can introduce Fe in an acidic solution in pickling3+, in acid medium, Fe3+It is cloudy
The standard positive potential of pole reduction is very high, it is easy to and cathodic reduction reaction is carried out, adds corrosion of metal speed, it is particularly easy
There is " spot corrosion " phenomenon.Therefore present invention control Fe3+Concentration, the excessive corrosion boiler inner wall in acid cleaning process is avoided, is caused a little
Lose phenomenon.
According to the cleaning method of the boiler of the specific embodiment of the invention, it is preferable that in step (5), the reducing agent is
Ascorbic acid.
Ascorbic acid also known as vitamin C, there is stronger reducing property, at the same it is also safe and non-toxic, reduce cleaning boiler mistake
Toxicity in journey.
According to the cleaning method of the boiler of the specific embodiment of the invention, it is preferable that in step (6), acid solution top row ponding
In flushing process, the water level control of drum is in 150-200mm.
According to the cleaning method of the boiler of the specific embodiment of the invention, it is preferable that in step (7), the organic amine is
Fatty amine, the fatty amine are monomethyl amine, dimethylamine and/or 1,2- dimethyl propylamine.
According to the cleaning method of the boiler of the specific embodiment of the invention, it is preferable that in step (8), in passivating process, vapour
Bag water level control is in 150-250mm.
According to the cleaning method of the boiler of the specific embodiment of the invention, it is preferable that in step (8), the passivating solution
Preparation process is：50 DEG C are first heated water to, adds acetoxime, polyacrylic acid amide, ethylenediamine and melamine, stirs 60-
80min, cooling, hydrogen peroxide is added, obtains the passivating solution.
Beneficial effects of the present invention are：
The cleaning method of boiler provided by the invention includes removal of impurities-flushing-soda boiling-flushing-pickling-acid solution top row and water
Flushing-rinsing-passivation.
(1) present invention adds the soda boiling under certain conditions of soda boiling liquid into steam generator system, using in soda boiling liquid and boiler
Wall greasy dirt reacts, and thoroughly removes greasy dirt, and soda boiling liquid of the invention is free of inorganic phosphate, reduces blowdown flow rate；
(2) present invention carries out pickling under certain conditions using pickle during pickling according to two loops,
Reacted using the incrustation scale, copper dirt and iron rust of acid and boiler inner wall, dissolve the incrustation scale and iron rust of boiler and inner-walls of duct,
First steam generator system is handled using hydrazine hydrate before pickling, removes dissolved oxygen and carbon dioxide in water, prevents that iron is dirty
With the formation of copper dirt, the poly-aspartate in pickle has good scale prevention ability, can effectively prevent the generation of calcium salt, hydroxyl
Base ethylene-diphosphonic acid has peptizaiton, can stablize the calcium ions and magnesium ions in water, on the one hand corrosion inhibiter effectively can disperse and hinder
Dirt, impurity is not on the other hand introduced into steam generator system, reduces the blowdown flow rate of cleaning boiler；
(3) pickling removes steam generator system with demineralized water later；Then boiler is rinsed, utilizes citric acid and organic amine
Steam generator system is rinsed, remove iron ion in steam generator system using the complexing power of citric acid and water rinse may be
Iron rust caused by metal surface, to create conditions in next step, the pH of stable regulation boiler water is capable of in the addition of organic amine, avoids ammonia
Local pH difference caused by water is adjusted；
(4) boiler is after cleaning, the metal active of inwall, easily by anticaustic, therefore it is carried out in next step
Passivation Treatment, passivating solution provided by the invention are organic passivation liquid, and chemical reaction generation passivating film can occur with boiler inner wall,
Meanwhile ammonium ion is not produced, avoid causing boiler ammonia corrosion, reduce blowdown flow rate.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, technical scheme will be carried out below
Detailed description.Obviously, described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art are resulting on the premise of creative work is not made to be owned
Other embodiment, belong to the scope that the present invention is protected.
Embodiment 1
The cleaning method of oil plant medium-pressure boiler, comprises the following steps：
(1) clean：The debris first cleared up in boiler；
(2) rinse：First boiler-steam dome, down-comer, economizer, water-cooling wall, lower collecting box and connecting tube are rinsed with demineralized water
Road, debris therein is rinsed well, rinsed to the transparent clarification of saliva is gone out, then keep boiler seal, improve pressure to boiler
1.25 times of operating pressure, check boiler seal performance；
(3) soda boiling：Soda boiling liquid is prepared, soda boiling is carried out to flushed boiler, wherein the soda boiling liquid includes Na2CO3
0.2%th, NaHCO30.2%th, cetylamine 0.5%, wetting agent 0.02%, surplus are water,
Soda boiling liquid is added in boiler, when water level to 2/5 position in drum, stops plus soda boiling liquid, sealing is added
Heat heating, closes air gate after the pressure in boiler reaches 0.1MPa, and carry out following three step boils furnaceman's work：
1. boosting to 0.4Mpa pressures tightens door to access bolt；
2. boosting to 1/2 boiler working pressure, kept for 48 hours, centre is to blowdown 2 times one by one of each sewage door of lower collecting box, valve
Door standard-sized sheet keeps 60s；
3. after softening water is simultaneously maintained to boiler progress bottom blow-down and surface blow-off, the total alkalinity for changing water to boiler water
10mmol/L, soda boiling terminate；
During soda boiling, a total alkalinity concentration is analyzed per 2h, soda boiling liquid is supplemented when total alkalinity is less than 45mmol/L, is protected
The total alkalinity for holding soda boiling liquid is not less than 45mmol/L；
(4) rinse：The boiler of step (3) alkali cleaning is rinsed using demineralized water, rinsed to going out the transparent clarification of saliva,
Precipitated without particle；
(5) pickling：The boiler flushed to step (4) carries out pickling, prepares pickle, and the pickle includes HCl
4%, poly-aspartate 0.2%, 1-hydroxy ethylidene-1,1-diphosphonic acid 0.3%, corrosion inhibiter 0.3%, defoamer 0.01%, reducing agent
0.01%, surplus is water,
Wherein described acid cleaning process comprises the following steps：
1. adding protection liquid into boiler, the protection liquid is hydrazine hydrate solution, and the concentration of the hydrazine hydrate solution is
200mg/L；
2. rise boiler pressure to 1.25 times of operating pressure, checks the sealing property of boiler；
3. putting into steam into the first loop and second servo loop, 48 DEG C are warming up to,
First loop is：Drum → down-comer → lower collecting box → water-cooling wall → drum,
The second servo loop is：Drum → economizer → drum；
4. steam is launched into cleaning case, according to the water in tertiary circuit circulating-heating boiler, in loop to be recycled
When water temperature reaches 50 DEG C, the Hybrid Heating closed in cleaning case, cleaning case and drum are adjusted to minimum operation water level, the described 3rd
Loop is：Cleaning case → economizer → lower collecting box → water-cooling wall → drum → cleaning case；
Mordant is added in cleaning case, adjusts the surface heating in cleaning case, control rinse liquid temperature is at 50 DEG C, control
For steam water-level in ± 100mm, cleaning monitors pipe inspection after 5 hours, when monitoring pipe is cleaned, and iron concentration change model
It is trapped among between ± 100mg/L, acidity excursion terminates pickling between ± 0.1% after recycling 1h；
(6) acid solution top row and water rinse：After pickling terminates, with demineralized water by cleaning fluid top row to neutralization pond, then with removing
Normal saline washing extremely exports water quality clear, no fine particle, and Fe2+And Fe3+Total concentration is 48mg/l, pH 4.6；
(7) rinse：After acid solution top row and water flushing terminate, launch auxiliary steam to cleaning case and heat, followed by tertiary circuit
Ring heating furnace water is warming up to 45 DEG C, citric acid is added in cleaning case, the concentration of the citric acid is 0.3%, and adds 1,2-
Dimethyl propylamine, regulation boiler water pH is 3.5, the circulation rinsing 2h at a temperature of 73 DEG C；
Passivation：Passivating solution is added into cleaning case, the passivating solution is：Acetoxime 0.4%, hydrogen peroxide 0.3%, melamine
Amine 0.5%, polyacrylamide 0.1%, ethylenediamine 0.5%, surplus are water, are heated to 40 DEG C, and passivation is circulated in tertiary circuit
5.5h, the Water Level Control of Steam stop passivation after 150mm treats to form one layer of passivating film on boiler inner wall, release passivating solution；
(9) sewage disposal：
1. collecting caused sewage during cleaning boiler, pH to 9 is adjusted；
2. to step 1. in neutral sewage sterilize, flocculation sediment removes impurity therein and scrap iron；
3. the progress nanofiltration of obtained supernatant is removed into salt treatment, obtain handling water, that is, complete the cleaning boiler.
After cleaning terminates, inside steam drum cleaning, no precipitation, there is passivating film on surface.
Embodiment 2
The cleaning method of heat power plant boiler, comprises the following steps：
(1) clean：The debris first cleared up in boiler；
(2) rinse：First boiler-steam dome, down-comer, economizer, water-cooling wall, lower collecting box and connecting tube are rinsed with demineralized water
Road, debris therein is rinsed well, rinsed to the transparent clarification of saliva is gone out, then keep boiler seal, improve pressure to boiler
1.3 times of operating pressure, check boiler seal performance；
(3) soda boiling：Soda boiling liquid is prepared, soda boiling is carried out to flushed boiler, wherein the soda boiling liquid includes Na2CO3
0.4%th, NaHCO30.6%th, cetylamine 1%, wetting agent 0.05%, surplus are water,
Soda boiling liquid is added in boiler, when water level to 1/2 position in drum, stops plus soda boiling liquid, sealing is added
Heat heating, closes air gate after the pressure in boiler reaches 0.15MPa, and carry out following three step boils furnaceman's work：
1. boosting to 0.5Mpa pressures tightens door to access bolt；
2. boosting to 1/2 boiler working pressure, kept for 36 hours, centre is to blowdown 3 times one by one of each sewage door of lower collecting box, valve
Door standard-sized sheet keeps 30s；
3. after softening water is simultaneously maintained to boiler progress bottom blow-down and surface blow-off, the total alkalinity for changing water to boiler water
12mmol/L, soda boiling terminate；
During soda boiling, a total alkalinity concentration is analyzed per 3h, soda boiling liquid is supplemented when total alkalinity is less than 45mmol/L, is protected
The total alkalinity for holding soda boiling liquid is not less than 45mmol/L；
(4) rinse：The boiler of step (3) alkali cleaning is rinsed using demineralized water, rinsed to going out the transparent clarification of saliva,
Precipitated without particle；
(5) pickling：The boiler flushed to step (4) carries out pickling, prepares pickle, and the pickle includes HCl
8%, poly-aspartate 0.5%, 1-hydroxy ethylidene-1,1-diphosphonic acid 0.6%, corrosion inhibiter 0.8%, defoamer 0.02%, reducing agent
0.02%, surplus is water,
Wherein described acid cleaning process comprises the following steps：
1. adding protection liquid into boiler, the pH of the protection liquid is 10.2, and the protection liquid is hydrazine hydrate solution, described
The concentration of hydrazine hydrate solution is 300mg/L；
2. rise boiler pressure to 1.3 times of operating pressure, checks the sealing property of boiler；
3. putting into steam into the first loop and second servo loop, 52 DEG C are warming up to,
First loop is：Drum → down-comer → lower collecting box → water-cooling wall → drum,
The second servo loop is：Drum → economizer → drum；
4. steam is launched into cleaning case, according to the water in tertiary circuit circulating-heating boiler, in loop to be recycled
When water temperature reaches 55 DEG C, the Hybrid Heating closed in cleaning case, cleaning case and drum are adjusted to minimum operation water level, the described 3rd
Loop is：Cleaning case → economizer → lower collecting box → water-cooling wall → drum → cleaning case；
Mordant is added in cleaning case, adjusts the surface heating in cleaning case, control rinse liquid temperature is at 55 DEG C, control
For steam water-level in ± 100mm, cleaning monitors pipe inspection after 6 hours, when monitoring pipe is cleaned, and iron concentration change model
It is trapped among between ± 100mg/L, acidity excursion terminates pickling between ± 0.1% after recycling 1.5h；
(6) acid solution top row and water rinse：After pickling terminates, with demineralized water by cleaning fluid top row to neutralization pond, then with removing
Normal saline washing extremely exports water quality clear, no fine particle, and Fe2+And Fe3+Total concentration is 45mg/l, pH 4.6；
(7) rinse：After acid solution top row and water flushing terminate, launch auxiliary steam to cleaning case and heat, followed by tertiary circuit
Ring heating furnace water is warming up to 50 DEG C, citric acid is added in cleaning case, the concentration of the citric acid is 0.4%, and adds a first
Amine, dimethylamine and 1,2- dimethyl propylamine, regulation boiler water pH is 4, the circulation rinsing 2.5h at a temperature of 75 DEG C；
(8) it is passivated：Passivating solution is added into cleaning case, the passivating solution is：Acetoxime 0.4-0.6%, hydrogen peroxide
0.5%, melamine 0.8%, polyacrylamide 0.2%, ethylenediamine 1%, surplus is water, the preparation process of the passivating solution
For：50 DEG C are first heated water to, adds acetoxime, polyacrylic acid amide, ethylenediamine and melamine, stirs 80min, is cooled down,
Hydrogen peroxide is added, the passivating solution is obtained, is heated to 45 DEG C, circulation passivation 6.5h, the Water Level Control of Steam exist in tertiary circuit
250mm, treat to be formed after one layer of passivating film on boiler inner wall, stop passivation, release passivating solution；
(9) sewage disposal：
1. collecting caused sewage during cleaning boiler, pH to 6 is adjusted；
2. to step 1. in neutral sewage sterilize, flocculation sediment removes impurity therein and scrap iron；
3. the progress nanofiltration of obtained supernatant is removed into salt treatment, obtain handling water, that is, complete the cleaning boiler.
After cleaning terminates, inside steam drum cleaning, no precipitation, there is passivating film on surface.
Embodiment 3
The cleaning method of ethylene plant's high-pressure boiler, comprises the following steps：
(1) clean：The debris first cleared up in boiler；
(2) rinse：First with conductance be 95 μ s/cm rinse boiler-steam dome, down-comer, economizer, water-cooling wall, lower collecting box with
And connecting pipe, debris therein is rinsed well, rinsed to the transparent clarification of saliva is gone out, then keeps boiler seal, improves pressure
Power checks boiler seal performance to 1.25 times of boiler working pressure；
(3) soda boiling：Soda boiling liquid is prepared, soda boiling is carried out to flushed boiler, wherein the soda boiling liquid includes Na2CO3
0.3%th, NaHCO30.4%th, cetylamine 0.6%, wetting agent 0.04%, surplus are water,
Soda boiling liquid is added in boiler, when water level to 1/2 position in drum, stops plus soda boiling liquid, sealing is added
Heat heating, closes air gate after the pressure in boiler reaches 0.1MPa, and carry out following three step boils furnaceman's work：
1. boosting to 0.5Mpa pressures tightens door to access bolt；
2. boosting to 1/2 boiler working pressure, kept for 40 hours, centre is to blowdown 3 times one by one of each sewage door of lower collecting box, valve
Door standard-sized sheet keeps 45s；
3. after softening water is simultaneously maintained to boiler progress bottom blow-down and surface blow-off, the total alkalinity for changing water to boiler water
12mmol/L, soda boiling terminate；
During soda boiling, a total alkalinity concentration is analyzed per 2.5h, soda boiling liquid is supplemented when total alkalinity is less than 45mmol/L,
The total alkalinity of soda boiling liquid is kept to be not less than 45mmol/L；
(4) rinse：It is that 95 μ s/cm are rinsed to the boiler of step (3) alkali cleaning using conductance, rinses to going out saliva
Transparent clarification, no particle precipitation；
(5) pickling：The boiler flushed to step (4) carries out pickling, prepares pickle, and the pickle includes HCl
6%, poly-aspartate 0.3%, 1-hydroxy ethylidene-1,1-diphosphonic acid 0.4%, corrosion inhibiter 0.6%, defoamer 0.015%, reducing agent
0.015%, surplus is water, and the corrosion inhibiter is o-xylene thiourea, and the reducing agent is ascorbic acid,
Wherein described acid cleaning process comprises the following steps：
1. adding protection liquid into boiler, the pH of the protection liquid is 9.8, and the protection liquid is hydrazine hydrate solution, described
The concentration of hydrazine hydrate solution is 250mg/L；
2. rise boiler pressure to 1.25 times of operating pressure, checks the sealing property of boiler；
3. putting into steam into the first loop and second servo loop, 50 DEG C are warming up to,
First loop is：Drum → down-comer → lower collecting box → water-cooling wall → drum,
The second servo loop is：Drum → economizer → drum；
4. steam is launched into cleaning case, according to the water in tertiary circuit circulating-heating boiler, in loop to be recycled
When water temperature reaches 52 DEG C, the Hybrid Heating closed in cleaning case, cleaning case and drum are adjusted to minimum operation water level, the described 3rd
Loop is：Cleaning case → economizer → lower collecting box → water-cooling wall → drum → cleaning case；
Mordant is added in cleaning case, adjusts the surface heating in cleaning case, control rinse liquid temperature is at 52 DEG C, control
Steam water-level works as Fe in ± 100mm3+>During 1000mg/L, adding reducing agent reduces Fe3+Concentration, make Fe3+Concentration is less than 750mg/
L, cleaning monitor pipe inspection after 5.5 hours, and when monitoring pipe is cleaned, and iron concentration excursion is in ± 100mg/L
Between, acidity excursion terminates pickling between ± 0.1% after recycling 1h；
(6) acid solution top row and water rinse：After pickling terminates, with conductance be 95 μ s/cm by cleaning fluid top row to neutralization pond,
Then it is that 95 μ s/cm are rinsed to outlet water quality clear, no fine particle, and Fe with conductance2+And Fe3+Total concentration is
40mg/l, pH 4.8, the water level control of drum is in 150mm；
(7) rinse：After acid solution top row and water flushing terminate, launch auxiliary steam to cleaning case and heat, followed by tertiary circuit
Ring heating furnace water is warming up to 50 DEG C, citric acid is added in cleaning case, the concentration of the citric acid is 0.35%, and adds a first
Amine, regulation boiler water pH is 4, the circulation rinsing 2.5h at a temperature of 75 DEG C；
(8) it is passivated：Passivating solution is added into cleaning case, the passivating solution is：Acetoxime 0.4-0.6%, hydrogen peroxide
0.4%, melamine 0.6%, polyacrylamide 0.15%, ethylenediamine 0.8%, surplus is water, the preparation of the passivating solution
Cheng Wei：50 DEG C are first heated water to, adds acetoxime, polyacrylic acid amide, ethylenediamine and melamine, stirs 60min, it is cold
But, hydrogen peroxide is added, the passivating solution is obtained, is heated to 45 DEG C, circulation passivation 6h, the Water Level Control of Steam exist in tertiary circuit
200mm, treat to be formed after one layer of passivating film on boiler inner wall, stop passivation, release passivating solution；
(9) sewage disposal：
1. collecting caused sewage during cleaning boiler, pH to 7 is adjusted；
2. to step 1. in neutral sewage sterilize, flocculation sediment removes impurity therein and scrap iron；
3. the progress nanofiltration of obtained supernatant is removed into salt treatment, obtain handling water, that is, complete the cleaning boiler.
After cleaning, drum inwall cleans, without precipitation, and there is passivating film generation on surface.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of boiler washing method, it is characterised in that comprise the following steps：
(1) clean：The debris cleared up in boiler；
(2) rinse：Boiler-steam dome, down-comer, economizer, water-cooling wall, lower collecting box and connecting pipe are rinsed with demineralized water, by it
In debris rinse well, rinse to the transparent clarification of saliva is gone out, then keep boiler seal, improve pressure to boiler working pressure
1.25-1.3 times, check boiler seal performance；
(3) soda boiling：Soda boiling liquid is prepared, soda boiling is carried out to flushed boiler, wherein the soda boiling liquid includes Na2CO3 0.2-
0.4%th, NaHCO30.2-0.6%, cetylamine 0.5-1%, wetting agent 0.02-0.05%, surplus are water,
Soda boiling liquid is added in boiler, when water level to 2/5-1/2 positions in drum, stops plus soda boiling liquid, sealing is added
Heat heating, closes air gate after the pressure in boiler reaches 0.1-0.15MPa, and carry out following three step boils furnaceman's work：
1. boosting to 0.4-0.5Mpa pressures tightens door to access bolt；
2. boosting to 1/2 boiler working pressure, kept for 36-48 hours, it is middle to blowdown 2-3 times one by one of each sewage door of lower collecting box,
Valve wide open keeps 30-60s；
3. after softening water is simultaneously maintained at 10- to boiler progress bottom blow-down and surface blow-off, the total alkalinity for changing water to boiler water
12mmol/L, soda boiling terminate；
During soda boiling, a total alkalinity concentration is analyzed per 2-3h, soda boiling liquid is supplemented when total alkalinity is less than 45mmol/L, is kept
The total alkalinity of soda boiling liquid is not less than 45mmol/L；
(4) rinse：The boiler of step (3) alkali cleaning is rinsed using demineralized water, rinsed to going out the transparent clarification of saliva, without
Grain precipitation；
(5) pickling：The boiler flushed to step (4) carries out pickling, prepares pickle, and the pickle includes HCl 4-8%,
Poly-aspartate 0.2-0.5%, 1-hydroxy ethylidene-1,1-diphosphonic acid 0.3-0.6%, corrosion inhibiter 0.3-0.8%, defoamer 0.01-
0.02%, reducing agent 0.01-0.02%, surplus is water,
Wherein described acid cleaning process comprises the following steps：
1. adding protection liquid into boiler, the protection liquid is hydrazine hydrate solution, and the concentration of the hydrazine hydrate solution is 200-
300mg/L；
2. rise boiler pressure to 1.25-1.3 times of operating pressure, checks the sealing property of boiler；
3. putting into steam into the first loop and second servo loop, 48-52 DEG C is warming up to,
First loop is：Drum → down-comer → lower collecting box → water-cooling wall → drum,
The second servo loop is：Drum → economizer → drum；
4. steam is launched into cleaning case, according to the water in tertiary circuit circulating-heating boiler, water temperature in loop to be recycled
When reaching 50-55 DEG C, the Hybrid Heating closed in cleaning case, cleaning case and drum are adjusted to minimum operation water level, the described 3rd
Loop is：Cleaning case → economizer → lower collecting box → water-cooling wall → drum → cleaning case；
Mordant is added in cleaning case, adjusts the surface heating in cleaning case, control rinse liquid temperature is at 50-55 DEG C, control
Steam water-level monitors pipe inspection in ± 100mm after cleaning 5-6 hours, and when monitoring pipe is cleaned, and iron concentration changes
For scope between ± 100mg/L, acidity excursion terminates pickling between ± 0.1% after recycling 1-1.5h；
(6) acid solution top row and water rinse：After pickling terminates, with demineralized water by cleaning fluid top row to neutralization pond, demineralized water is then used
Rinse to outlet water quality clear, no fine particle, and Fe2+And Fe3+Total concentration<50mg/l, pH>4.5；
(7) rinse：After acid solution top row and water flushing terminate, launch auxiliary steam to cleaning case and heat, add by tertiary circuit circulation
Hot stove water is warming up to 45-50 DEG C, and citric acid is added in cleaning case, and the concentration of the citric acid is 0.3-0.4%, and addition has
Machine amine, regulation boiler water pH is 3.5-4, the circulation rinsing 2-2.5h at a temperature of 73-75 DEG C；
(8) it is passivated：Passivating solution is added into cleaning case, the passivating solution is：Acetoxime 0.4-0.6%, hydrogen peroxide 0.3-
0.5%, melamine 0.5-0.8%, polyacrylamide 0.1-0.2%, ethylenediamine 0.5-1%, surplus are water, are heated to 40-
45 DEG C, the circulation passivation 5.5-6.5h in tertiary circuit, treat to be formed after one layer of passivating film on boiler inner wall, stop passivation, put
Go out passivating solution, that is, complete the cleaning boiler.
2. boiler washing method according to claim 1, it is characterised in that methods described also includes sewage disposal, described
Sewage disposal comprises the following steps：
(1) caused sewage during collection cleaning boiler, adjusts pH to 6-9；
(2) the neutral sewage in step (1) is sterilized, flocculation sediment removes impurity and scrap iron therein；
(3) the progress nanofiltration of obtained supernatant is removed into salt treatment, obtains handling water.
3. boiler washing method according to claim 2, it is characterised in that in step (1), in addition to added into sewage
Activated carbon.
4. boiler washing method according to claim 1, it is characterised in that the electrical conductivity of the demineralized water is less than 100 μ s/
cm。
5. boiler washing method according to claim 1, it is characterised in that in step (5), the corrosion inhibiter is adjacent diformazan
Benzene thiocarbamide.
6. boiler washing method according to claim 1, it is characterised in that step (5) 1. in, it is described protection liquid pH be
9.8-10.2。
7. boiler washing method according to claim 1, it is characterised in that step (5) 4. in, Fe is worked as in acid cleaning process3 +>During 1000mg/L, adding reducing agent reduces Fe3+Concentration, make Fe3+Concentration is less than 750mg/L.
8. boiler washing method according to claim 1, it is characterised in that in step (6), acid solution top row ponding is flushed
Cheng Zhong, the water level control of drum is in 150-200mm.
9. boiler washing method according to claim 1, it is characterised in that in step (7), the organic amine is fat
Amine, the fatty amine are monomethyl amine, dimethylamine and/or 1,2- dimethyl propylamine.
10. boiler washing method according to claim 1, it is characterised in that in step (8), in passivating process, drum water
Position control is in 150-250mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711011217.2A CN107747728A (en) | 2017-10-24 | 2017-10-24 | A kind of cleaning method of boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711011217.2A CN107747728A (en) | 2017-10-24 | 2017-10-24 | A kind of cleaning method of boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107747728A true CN107747728A (en) | 2018-03-02 |
Family
ID=61253157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711011217.2A Pending CN107747728A (en) | 2017-10-24 | 2017-10-24 | A kind of cleaning method of boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107747728A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109237459A (en) * | 2018-09-02 | 2019-01-18 | 青岛安装建设股份有限公司 | A kind of newly-built drum boiler chemical cleaning method |
| CN109456857A (en) * | 2018-10-19 | 2019-03-12 | 华电电力科学研究院有限公司 | A kind of contaminant removing cleaning agent and preparation method thereof of thermal power plant's pipeline |
| CN111850572A (en) * | 2020-07-23 | 2020-10-30 | 上海康跃化工科技有限公司 | Central air conditioner host cleaning solution and cleaning method |
| CN112853334A (en) * | 2021-01-20 | 2021-05-28 | 浙江诺格汽车模具有限公司 | Surface phosphating method for stamping die |
| CN113080694A (en) * | 2021-05-26 | 2021-07-09 | 宁波嘉乐智能科技股份有限公司 | Method for cleaning cooking utensil with cooking function |
| CN113551219A (en) * | 2021-07-19 | 2021-10-26 | 国家能源集团福建能源有限责任公司 | Boiler unit cleaning method |
| TWI744801B (en) * | 2019-04-26 | 2021-11-01 | 日商三菱動力股份有限公司 | Chemical cleaning method and chemical cleaning device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1854092A (en) * | 2005-04-25 | 2006-11-01 | 上海万森水处理有限公司 | Corrosion-proofing and antisludging method of boiler |
| CN101498004A (en) * | 2008-11-21 | 2009-08-05 | 宁夏电力科技教育工程院 | Chemical scrubbing method for boiler |
| CN102183172A (en) * | 2011-01-26 | 2011-09-14 | 常州市奥琳斯邦热能设备有限公司 | Water washing method for furnace tube of heat conducting oil boiler |
-
2017
- 2017-10-24 CN CN201711011217.2A patent/CN107747728A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1854092A (en) * | 2005-04-25 | 2006-11-01 | 上海万森水处理有限公司 | Corrosion-proofing and antisludging method of boiler |
| CN101498004A (en) * | 2008-11-21 | 2009-08-05 | 宁夏电力科技教育工程院 | Chemical scrubbing method for boiler |
| CN102183172A (en) * | 2011-01-26 | 2011-09-14 | 常州市奥琳斯邦热能设备有限公司 | Water washing method for furnace tube of heat conducting oil boiler |
Non-Patent Citations (4)
| Title |
|---|
| 国家能源局: "《火力发电厂锅炉化学清洗导则》", 31 March 2012, 中国电力出版社 * |
| 杨荣和: "《工业锅炉水处理技术教程》", 30 November 2015, 气象出版社 * |
| 汪多仁: "《绿色净水处理剂》", 30 November 2006, 科学技术文献出版社 * |
| 祁鲁梁: "《水处理药剂及材料实用手册》", 30 June 2006, 中国石化出版社 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109237459A (en) * | 2018-09-02 | 2019-01-18 | 青岛安装建设股份有限公司 | A kind of newly-built drum boiler chemical cleaning method |
| CN109237459B (en) * | 2018-09-02 | 2021-05-18 | 青岛安装建设股份有限公司 | Chemical cleaning method for newly-built drum furnace |
| CN109456857A (en) * | 2018-10-19 | 2019-03-12 | 华电电力科学研究院有限公司 | A kind of contaminant removing cleaning agent and preparation method thereof of thermal power plant's pipeline |
| TWI744801B (en) * | 2019-04-26 | 2021-11-01 | 日商三菱動力股份有限公司 | Chemical cleaning method and chemical cleaning device |
| CN111850572A (en) * | 2020-07-23 | 2020-10-30 | 上海康跃化工科技有限公司 | Central air conditioner host cleaning solution and cleaning method |
| CN111850572B (en) * | 2020-07-23 | 2021-09-14 | 上海康跃化工科技有限公司 | Central air conditioner host cleaning solution and cleaning method |
| CN112853334A (en) * | 2021-01-20 | 2021-05-28 | 浙江诺格汽车模具有限公司 | Surface phosphating method for stamping die |
| CN113080694A (en) * | 2021-05-26 | 2021-07-09 | 宁波嘉乐智能科技股份有限公司 | Method for cleaning cooking utensil with cooking function |
| CN113551219A (en) * | 2021-07-19 | 2021-10-26 | 国家能源集团福建能源有限责任公司 | Boiler unit cleaning method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107747728A (en) | A kind of cleaning method of boiler | |
| CN101864575B (en) | Special cleaning agent for stainless steel equipment and use method thereof | |
| CN103755082B (en) | System and method for resource recovery of regenerated wastewater of ion exchange resin | |
| CN101195919B (en) | Film inhibitor and uses thereof | |
| CN109735850A (en) | A kind of method of pickling iron and steel and water circulation use | |
| CN103525599A (en) | Boiler scale remover | |
| CN206089294U (en) | Steel industry hydrochloric acid pickling liquid waste's processing recovery system | |
| CN106277486A (en) | The process recovery method of a kind of steel industry hydrochloric acid pickling waste liquor and system thereof | |
| CN209397043U (en) | A kind of industrial circulating water dirt purification device | |
| CN108193201A (en) | A kind of recirculated cooling water cleans prefilming method | |
| CN203768157U (en) | Ion exchange resin regenerated waste water resource recycling system | |
| CN114477479A (en) | Online scale preventing and removing agent for circulating water | |
| CN112815767B (en) | Cleaning method of seawater desalination device | |
| CN107525432A (en) | A kind of method that concentrated wet-process phosphoric acid is cleaned with graphite heat exchanger | |
| WO2021082305A1 (en) | Circulating cooling water treatment device and circulating cooling water treatment method | |
| JPS62235490A (en) | Method for dissolving and removing iron oxide | |
| CN113293386A (en) | Chemical cleaning agent for insoluble scale of seawater desalination device | |
| CN103182389A (en) | Physical and chemical mixed cleaning process for reactor heat exchanger | |
| CN103373775B (en) | Membrane method treatment process of circulation cooling water raw water and special system for membrane method treatment process | |
| CN218120745U (en) | Plate heat exchanger belt cleaning device | |
| CN218539438U (en) | High salinity water softening installation based on electromagnetic adsorption principle | |
| JP4557324B2 (en) | Method for producing anti-corrosion water | |
| CN102538572B (en) | Method for cleaning spiral-plate heat exchanger | |
| CN109231600A (en) | A kind of industrial circulating water dirt purification device and its descaling method | |
| CN105316689B (en) | A kind of natural gas water batch heater chemical and cleaning method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180302 |
|
| RJ01 | Rejection of invention patent application after publication |