CN108505052A - A kind of superheater and reheater anti-deposit type complex cleaning and washing agent, device and method - Google Patents
A kind of superheater and reheater anti-deposit type complex cleaning and washing agent, device and method Download PDFInfo
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- CN108505052A CN108505052A CN201810140789.9A CN201810140789A CN108505052A CN 108505052 A CN108505052 A CN 108505052A CN 201810140789 A CN201810140789 A CN 201810140789A CN 108505052 A CN108505052 A CN 108505052A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
- C23G1/06—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors
- C23G1/061—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors nitrogen-containing compounds
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- Organic Chemistry (AREA)
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- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
A kind of superheater and reheater anti-deposit type complex cleaning and washing agent, device and method, including following component, inositol phosphate, citric acid, formic acid, polyacrylic acid, metasilicic acid, organic acid inhibitor and corresponding steps.The present invention can bring following advantageous effect：Composite reagent cooperative ability is notable, cleaning ability is strong, cleaning formulation has good anti-deposit and stable suspersion performance, one layer of complete, fine and close inositol phosphate metal chelate can be automatically formed in cleaning to be covered on metal inner surface, the interfacial structure for improving cleansing medium and metal inner surface, is greatly reduced corrosion rate；The high-content for avoiding dangerous anode, cathode or composite inhibiter uses, and reduces corrosion inhibiter dosage；Deposition can be significantly reduced, avoids superheater, reheater tube from forming vent plug and blocking, reduces booster probability after cleaning, improve cleaning quality and safety.
Description
Technical field
The invention belongs to the chemical cleaning medicine technical fields of the snakelike tube bank of the pipe with small pipe diameter such as superheater, are related specifically to a kind of mistake
Hot device and reheater cleaning agent, device and method.
Background technology
It is influenced by economic technology, even if Industrial Boiler make-up water uses grade II desalted water, therrmodynamic system fouling, burn into product
Salt phenomenon still has, and superheater, reheater are the important heating surfaces for promoting boiler thermal efficiency, reducing flue-gas temperature, when work
Its internal circulation is high-temperature high-pressure steam, and outside is high temperature, the flue gas containing particulate matter and salt.According to carbonated drink to salinity
Dissolution characteristics under different parameters, steam is carried by dissolving or machinery carries (drum boiler), the salt branch in steam according to
The influences such as its dissolution characteristics and distribution coefficient, deposit inside the steam systems such as superheater, reheater, steam turbine, salification speed
The relating to parameters such as rate and drum internals integrality, Steam-water Quality, operating parameter and load, steam carry over factor, time, this
External superheat device, reheater, which also occur that, stops (standby) oxygen corrosion, the corrosion of acid (alkali) property and high-temperature vapor corrosion.
Salinity, erosion deposition can reduce heat exchange efficiency, cause restrain overtemperature even overheat booster the case where, through system
Meter, it is " four pipes " leakage that boiler tube bursting is non-, which to stop the 90% of accident, and because high temperature corrosion, salinity deposition block etc. factors superheater,
Reheater bursting leakage accounts for " four pipes " 56% or more leakage, that is to say, that unit caused by burn into salification is non-to stop accounting for entire unit
Non- 50% or so stopped, in addition, the superheater and reheater generally existing high temperature of domestic supercritical and extra-supercritical unit
Vapor corrosion, the oxide skin that vapor corrosion generates reach certain thickness, the variations such as temperature, load, the combustion parameter of boiler
When larger, oxide skin, which will be layered, to fall off, especially the Unit Commitment stage, and therefore, the improvement of superheater, reheater oxide skin is
The outstanding difficulty that current supercritical unit and extra-supercritical unit face.Currently, there are three types of measures to administer oxide skin, one of them
It is exactly chemical cleaning,《Heat power plant boiler chemical cleaning directive/guide》Also to superheater and reheater in (DL/T 794-2012)
Cleaning is provided that the mechanism of cleaning is to ensure that cleaning flow velocity is high using big flow low lift cleaning pump, and compound drug fills
Point dissolved corrosion product and salinity, avoid that oxide skin is blocking, layered large area falls off to the maximum extent, formed block, vent plug.By
It can more preferably ensure elimination effect and efficiency in chemical cleaning, some cycles no longer will appear oxide skin blocking booster thing after cleaning
Therefore therefore, superheater, reheater chemical cleaning be ensure unit safety, economy, the important technique measure of stable operation.
Currently, superheater is grasped and was implemented in the whole nation, the unit of reheater chemical cleaning is no more than 3, why few, master
If because chemical cleaning medicament formula is to ensure that the key of cleaning quality and safety, and chemical cleaning medicament formula is by special
Profit protection, group become：Inorganic acid complex drug+corrosion inhibiter+cosolvent ,+dispersant+wetting agent+other various auxiliary agents.Overheat
Existing outstanding problem is shown as in device, reheater cleaning or after cleaning：Reagent cost is very high, cleaning charge is very high, one
350MW parameter boiler superheater cleaning charges just reach 300~4,000,000；Medicament could be improved the solvability of oxide skin,
There are still the accidents of booster after blocking and cleaning in cleaning；It is influenced by powder performance, scavenging period is long.
Therefore there is an urgent need for a kind of novel technical solutions to solve the problems, such as this in the prior art.
Invention content
The technical problem to be solved by the present invention is to：There is provided a kind of superheater and reheater anti-deposit type complex cleaning and washing agent,
Device and method further avoid cleaning and block, shorten the purpose is to ensure, promoted superheater and reheater quality and safety
Clean the duration.
A kind of superheater and reheater anti-deposit type complex cleaning and washing agent, including following component, inositol phosphate, lemon
Acid, formic acid, polyacrylic acid, metasilicic acid, organic acid inhibitor.
A concentration of the 3~8% of the inositol phosphate, a concentration of the 1~1.5% of the citric acid, the formic acid
A concentration of 0.3~0.8%, a concentration of the 0.2~0.4% of the polyacrylic acid, the metasilicic acid a concentration of 0.1%~
0.2%, a concentration of the 0.3~0.4% of the organic acid inhibitor.
The organic acid inhibitor is benzotriazole.
A kind of superheater and reheater anti-deposit type composite cleaning device, including cleaning case, porous plate, water inlet, water outlet
Mouth, sewage draining exit and cleaning pump；
The porous plate is set to the inside of the cleaning case；
It is provided with circular hole on the porous plate；
The water inlet is set to the top of the cleaning case；
The water outlet is set to the top of the porous plate；
The sewage outfalls setting is in the bottom of the cleaning case；
The cleaning pump is connected with the water outlet.
It is additionally provided with strainer between the water outlet and the cleaning pump.
The side of the strainer is provided with flush pipe.
A kind of superheater and reheater anti-deposit type compound cleaning method, include the following steps,
Step 1, choose foregoing raw material inositol phosphate, citric acid, formic acid, polyacrylic acid, metasilicic acid,
Organic acid inhibitor；
Step 2 opens water inlet using a kind of superheater and reheater anti-deposit type composite cleaning device as previously described
Mouthful, it injects water into the cleaning case, superheater or reheater is put into, then the water temperature in the cleaning case is increased to 70~
95 DEG C, it is 0.8~2m/s to adjust flow rate of liquid in cleaning case；
Step 3 sequentially adds 0.3~0.4% organic acid inhibitor and 0.1%~0.2% metasilicic acid, cycle 20~30
Minute；
Step 4 promotes the flow velocity in cleaning case to 1.0~2.5m/s；Sequentially add 3~8% inositol phosphates,
0.3~0.8% formic acid recycles 20~30 minutes；
Step 5, sequentially adds 0.2~0.4% polyacrylic acid, 1~1.5% citric acid, and cycle 16~for 24 hours, take out overheat
Device or reheater.
By above-mentioned design scheme, the present invention can bring following advantageous effect：Composite reagent cooperative ability is notable, cleaning
Ability is strong, and under same units volume and acidity, the medicament is to 2.5 times that the cleaning capacity of dirty class, salification is other prescription medicaments
More than；There is cleaning formulation good anti-deposit and stable suspersion performance, the mechanism which descales to be：
Based on complexing+dissolving, mechanism supplemented by dispersion+suspension has good fluidization ability, and the deposition than other formulas is less than
60% or so；In cleaning, one layer of complete, fine and close inositol phosphate-metallo-chelate can be automatically formed and be covered in metal
On inner wall, the interfacial structure of cleansing medium and metal inner surface is improved, corrosion rate is greatly reduced；The corruption of superheater, reheater
Lose oxide skin, the mainly metal oxide of the high-valence states such as Fe, Cr, V, Mo, inositol phosphate can preferentially and high-valency metal
Chelatropic reaction occurs for substance, ensure that the elimination effect of oxide skin；Give full play to the precipitation reaction shape of inositol phosphate ester salt
At compact and complete absorbent-type oxidation film reduce corrosion rate, avoid the height of dangerous anode, cathode or composite inhibiter
Content uses, and is reduced to corrosion inhibiter dosage and performance specification, reduces corrosion inhibiter dosage；Water temperature (0~100 DEG C), pH value
(pH2.5~12) hydrolyze medicament, complexing power is substantially without influence, while being influenced on cleaning corrosion rate, corrosion total amount basic
Constant, maximum variation is no more than 15%；Cleaning solution is low to dirty layer stripping ability, but to impurity, the good absorption of deposit and network
Cooperation is used, and reaction product has good gel characteristics and peptizaiton, can significantly reduce deposition, avoid superheater, reheating
Device pipe forms vent plug and blocking, reduces booster probability after cleaning, improves cleaning quality and safety；Waste liquid stability is good,
It is unlikely to deteriorate, heavy metal pollution will not be generated to environment, and be easily handled, the conventional means disposition such as burning, neutralization can be used；
Inositol phosphate complexing power is very big, to pH value, temperature dependency very little；The use of formula avoids wetting agent, hydrotropy
A large amount of uses of the conventional cleaning adjuncts such as agent, surfactant；Avoid it is conventional technique is cleaned multiple times, clean phase with conventional
Than that can save scavenging period about 1/2~2/3, decrease to cleaning flow rates demand.
Description of the drawings
Below in conjunction with the drawings and specific embodiments, the present invention is further illustrated：
Fig. 1 is a kind of flow diagram of superheater and reheater anti-deposit type compound cleaning method of the present invention.
Fig. 2 is a kind of schematic cross-sectional view of superheater and reheater anti-deposit type composite cleaning device of the present invention.
In figure, 1- cleaning cases, 2- porous plates, 3- water inlets, 4- water outlets, 5- sewage draining exits, 6- cleaning pumps.
Specific implementation mode
A kind of superheater and reheater anti-deposit type complex cleaning and washing agent, including following component, inositol phosphate, lemon
Acid, formic acid, polyacrylic acid, metasilicic acid, organic acid inhibitor.
A concentration of the 3~8% of the inositol phosphate, a concentration of the 1~1.5% of the citric acid, the formic acid
A concentration of 0.3~0.8%, a concentration of the 0.2~0.4% of the polyacrylic acid, the metasilicic acid a concentration of 0.1%~
0.2%, a concentration of the 0.3~0.4% of the organic acid inhibitor.
The organic acid inhibitor is benzotriazole.
A kind of superheater and reheater anti-deposit type composite cleaning device, as shown in Fig. 2, including cleaning case 1, porous plate 2,
Water inlet 3, water outlet 4, sewage draining exit 5 and cleaning pump 6；
The porous plate 2 is set to the inside of the cleaning case 1；
It is provided with circular hole on the porous plate 2；
The water inlet 3 is set to the top of the cleaning case 1；
The water outlet is set to the top of the porous plate 2；
The sewage draining exit 5 is set to the bottom of the cleaning case 1；
The cleaning pump 6 and the water outlet 4 connect.
It is additionally provided with strainer between the water outlet 4 and the cleaning pump 6.
The side of the strainer is provided with flush pipe.
A kind of superheater and reheater anti-deposit type compound cleaning method, as shown in Figure 1, include the following steps,
Step 1, choose raw material inositol phosphate as described in claim 1, citric acid, formic acid, polypropylene
Acid, metasilicic acid, organic acid inhibitor；
Step 2 is beaten using a kind of superheater and reheater anti-deposit type composite cleaning device as claimed in claim 4
It drives the mouth of a river into, injects water into the cleaning case 1, superheater or reheater are put into, then by the water temperature liter in the cleaning case 1
Up to 70~95 DEG C, it is 0.8~2m/s to adjust flow rate of liquid in cleaning case 1；
Step 3 sequentially adds 0.3~0.4% organic acid inhibitor and 0.1%~0.2% metasilicic acid, cycle 20~30
Minute；
Step 4 promotes the flow velocity in cleaning case 1 to 1.0~2.5m/s；Sequentially add 3~8% inositol phosphates,
0.3~0.8% formic acid recycles 20~30 minutes；
Step 5, sequentially adds 0.2~0.4% polyacrylic acid, 1~1.5% citric acid, and cycle 16~for 24 hours, take out overheat
Device or reheater.
Embodiment 1
The cleaning case 1 of long 5m, wide 2.5m, high 3.5m are selected, the thickness of centre setting porous plate 2, porous plate 2 is 0.5mm,
It is covered with circular hole, a diameter of 4mm of circular hole on porous plate 2.Porous plate 2 divides for upper layer and lower layer, lower floor height 0.6m, for storing cleaning
The a small amount of deposit to get off, it is 0.8m that cleaning pump 6, which sucks open height, and upwards in 15 degree of inclinations.
Water inlet 3 is opened, 1 water filling of cleaning case is given, superheater or reheater is put into, then by the water in the cleaning case 1
Temperature is increased to 80 DEG C, and it is 1.5m/s to adjust flow rate of liquid in cleaning case 1；
Water inlet 3 is closed, 0.3% organic acid inhibitor and 0.1% metasilicic acid are sequentially added, is recycled 25 minutes；
The flow velocity in cleaning case 1 is promoted to 2m/s；Sequentially add 3% inositol phosphate, 0.6% formic acid, cycle 30
Minute；
0.3% polyacrylic acid, 1.5% citric acid are sequentially added, 20h is recycled, takes out superheater or reheater, completes cleaning
Work.
After standing 2 hours, the particle in cleaning case 1 in waste water is deposited to 2 lower section of porous plate, and opening cleaning pump 6 will clean
Waste water in case 1 is discharged by water outlet 4, then opens sewage draining exit 5, and dirt is discharged, you can carries out cleaning next time.
This cleaning method has cleaning capacity big, and cleaning solution anti-deposit, stable suspersion excellent performance, fluidised form, peptizaiton are good
Good, few to the stripping of dirty layer, impurity deposition is low, is not susceptible to cleaning and blocks, corrosion rate is low, and corrosion inhibiter and cleaning additive make
The distinguishing features such as dosage is low, therefore, this method has both safe efficient, environmentally friendly, economic advantage, there is good application prospect.
Claims (7)
1. a kind of superheater and reheater anti-deposit type complex cleaning and washing agent, it is characterized in that：Including following component, inositol phosphoric acid
Ester, citric acid, formic acid, polyacrylic acid, metasilicic acid, organic acid inhibitor.
2. a kind of superheater according to claim 1 and reheater anti-deposit type complex cleaning and washing agent, it is characterized in that:The ring
A concentration of the 3~8% of hexitol phosphate, a concentration of the 1~1.5% of the citric acid, the formic acid a concentration of 0.3~
0.8%, the polyacrylic acid a concentration of 0.2~0.4%, the metasilicic acid a concentration of 0.1%~0.2%, it is described organic
A concentration of the 0.3~0.4% of acid inhibitor.
3. a kind of superheater according to claim 1 and reheater anti-deposit type complex cleaning and washing agent, it is characterized in that：It is described to have
Machine acid inhibitor is benzotriazole.
4. a kind of superheater and reheater anti-deposit type composite cleaning device, it is characterized in that：Including cleaning case (1), porous plate
(2), water inlet (3), water outlet (4), sewage draining exit (5) and cleaning pump (6)；
The porous plate (2) is set to the inside of the cleaning case (1)；
It is provided with circular hole on the porous plate (2)；
The water inlet (3) is set to the top of the cleaning case (1)；
The water outlet is set to the top of the porous plate (2)；
The sewage draining exit (5) is set to the bottom of the cleaning case (1)；
The cleaning pump (6) and the water outlet (4) connection.
5. a kind of superheater according to claim 1 and reheater anti-deposit type composite cleaning device, it is characterized in that：It is described
It is additionally provided with strainer between water outlet (4) and the cleaning pump (6).
6. a kind of superheater according to claim 1 and 2 and reheater anti-deposit type composite cleaning device, it is characterized in that：
The side of the strainer is provided with flush pipe.
7. a kind of superheater and reheater anti-deposit type compound cleaning method, it is characterized in that：Include the following steps,
Step 1, choose raw material inositol phosphate as described in claim 1, citric acid, formic acid, polyacrylic acid, partially
Silicic acid, organic acid inhibitor；
Step 2, using a kind of superheater as claimed in claim 4 and reheater anti-deposit type composite cleaning device, open into
The mouth of a river (3) injects water into the cleaning case (1), superheater or reheater is put into, then by the water in the cleaning case (1)
Temperature is increased to 70~95 DEG C, and adjustment cleaning case (1) interior flow rate of liquid is 0.8~2m/s；
Step 3 sequentially adds 0.3~0.4% organic acid inhibitor and 0.1%~0.2% metasilicic acid, recycles 20~30 minutes；
Step 4 promotes flow velocity in cleaning case (1) to 1.0~2.5m/s；Sequentially add 3~8% inositol phosphates,
0.3~0.8% formic acid recycles 20~30 minutes；
Step 5, sequentially adds 0.2~0.4% polyacrylic acid, 1~1.5% citric acid, cycle 16~for 24 hours, take out superheater or
Reheater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810140789.9A CN108505052B (en) | 2018-02-11 | 2018-02-11 | Deposition-resistant composite cleaning agent, device and method for superheater and reheater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810140789.9A CN108505052B (en) | 2018-02-11 | 2018-02-11 | Deposition-resistant composite cleaning agent, device and method for superheater and reheater |
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Cited By (1)
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| CN111810934A (en) * | 2020-08-22 | 2020-10-23 | 西安热工研究院有限公司 | Washing system and washing method for salt accumulation of power station boiler system |
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