CN107228575A - A kind of indirect air cooling unit circulation process for corrosion control - Google Patents
A kind of indirect air cooling unit circulation process for corrosion control Download PDFInfo
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- CN107228575A CN107228575A CN201710507924.4A CN201710507924A CN107228575A CN 107228575 A CN107228575 A CN 107228575A CN 201710507924 A CN201710507924 A CN 201710507924A CN 107228575 A CN107228575 A CN 107228575A
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- hydrazine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/04—Auxiliary systems, arrangements, or devices for feeding, collecting, and storing cooling water or other cooling liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention discloses a kind of indirect air cooling unit circulation process for corrosion control, comprising：Reducing agent is prepared, the reducing agent includes hydrazine hydrate and L ascorbic acid；Detect the pH value of circulation；As circulation pH≤8.5, reducing agent is added to recirculated water：The μ g/L of 10 μ g/L of hydrazine 20；Ascorbic acid concentrations：0μg/L；As circulation pH>When 8.5, reducing agent is added to recirculated water：The μ g/L of 30 μ g/L of hydrazine 40；Ascorbic acid concentrations：40μg/L.Reducing agent of the invention by adding from compounding to circulation system, changes the electrochemical equilibrium in the circulatory system, reduces the galvanic corrosion speed in the circulatory system.
Description
Technical field
Circulated the present invention relates to a kind of circulating water in turbine condenser treatment technology, more particularly to a kind of indirect air cooling unit
Water system process for corrosion control.
Background technology
In recent years due to the anxiety of water resource, the water shortage in northwest and coal enrichment area, build high parameter thermal power generation
Unit has important and far-reaching meaning for extenuating coal transport power, conveying clear energy sources.Turbine condenser is using direct empty
Cold or indirect air cooling technology has turned into the inevitable choice that electric power stations near coal-mines is built in the rich coal area of water shortage.
Indirect air cooling unit has passed on the advantage of wet type cooling unit and Air-cooled Unit, and the characteristics of its is maximum is to make on a large scale
With structural material of the 1050A fine aluminiums as air cooling heat radiator, absorb weary after steam turbine acting using air cooled recirculated water
Vapour condenses institute's liberated heat.Circulation is as main auxiliary system, and the reliability of its service requirement is stronger, and area is huge
The complicated aluminium radiator cost of big manufacturing process is high, once occurring corrosion and damage, time and effort consuming is changed in maintenance, causes huge straight
Connect and indirect economic loss.Therefore, rational water-chemical regime is organized, system rate of metal corrosion is reduced to greatest extent to warp
Ji, energy-conservation, it is safe and reliable operation play the role of it is very important.
Using the indirect air cooling system of 1050A fine aluminium air cooling heat radiators be current domestic design indirect air cooling unit it is main
Type.Operational experience feedback proves, the circulation of this modular design although recirculated water has used high-quality demineralized water,
But the sudden rises of recirculated water pH are all occurred in that in constructin phase and operation, trigger 1050A fine aluminiums air cooling heat radiator to occur tight
Heavy corrosion malicious event forces the production accident of compressor emergency shutdown, and huge threat is caused to indirect air cooling unit safety operation.
Indirect air cooling unit, which is followed in water system, has the different materials such as carbon steel, stainless steel, 1050A fine aluminiums, these materials
There are a variety of corrosion phenomenons (local corrosion and homogeneous corrosion) and deposit in longtime running under the corrosive environment containing oxygen and carbon dioxide
Complicated factor, indirect air cooling unit, which follows main corrosion form present in water system, to be included:
1) cooling triangle water inlet pipe and water outlet pipe expansion joint flange 1050A fine aluminiums/Q235B carbon steel galvanic corrosions；
2) 1050A fine aluminiums cooling triangle recirculated water side homogeneous corrosion and spot corrosion；
3) Q235B carbon steels condensing water conduit homogeneous corrosion；
4) the stainless steel adpting flange galvanic corrosion of Q235B carbon steels/304；
5) 304 stainless steel condenser pipe water side corrosion.
A kind of water-chemical regime how is organized, the part of carbon steel, stainless steel and 1050A fine aluminiums can be simultaneously effective controlled
Corrosion and homogeneous corrosion are to ensure indirect air cooling circulation and overcritical indirect air cooling generating set safety and economic operation
Technical barrier urgently to be resolved hurrily.
The content of the invention
In view of this, controlled the technical problem to be solved in the present invention is to provide a kind of corrosion of indirect air cooling unit circulation
Method processed, occurs heavy corrosion so that forcing compressor emergency shutdown to solve carbon steel, stainless steel and 1050A fine aluminiums air cooling heat radiator
The problem of production accident.
To solve problem above, the present invention proposes a kind of indirect air cooling unit circulation process for corrosion control, comprising
Following steps：
Reducing agent is configured, the reducing agent includes the component B of component A and the 0-60 parts by weight of 20.0-100.0 parts by weight,
The component A includes hydrazine hydrate；The component B includes L-AA；
Detect the pH value of circulation；
As circulation pH≤8.5, adding the reducing agent to recirculated water makes concentration control exist：The μ g/L- of hydrazine 10
20μg/L；The μ g/L of ascorbic acid 0；
As circulation pH>When 8.5, adding the reducing agent to recirculated water makes concentration control exist：The μ g/L-40 of hydrazine 30
μg/L；The μ g/L of ascorbic acid 40.
Further, as circulation pH≤8.5, adding the reducing agent to recirculated water makes concentration control exist：Connection
The μ g/L of ammonia 16；The μ g/L of ascorbic acid 0；
As circulation pH>When 8.5, adding the reducing agent to recirculated water makes concentration control exist：The μ g/L of hydrazine 30；It is anti-
The μ g/L of bad hematic acid 40.
Further, the component A is included on the basis of its gross weight：
80% aqueous solution hydrazine hydrate 20-60 parts by weight；
50% hydroxylamine solution AR 0-2.0 parts by weight；
Desalination water surplus.
Further, the component B is included on the basis of its gross weight：
Further, the deoxidation catalyst is cobaltous sulfate or the dissolvable salt of other one or more cobalts.
The indirect air cooling unit circulation process for corrosion control that the present invention is realized, by adding a kind of energy to recirculated water
It is enough fast and effeciently to adjust and change the 1050A fine aluminium air cooling heat radiator surface electrochemistry shapes that area is huge, planform is complicated
State reducing agent carries out reproducibility processing, the electrochemical state of regulation carbon steel, stainless steel and 1050A fine aluminium corrosion systems to recirculated water
Realize reduction corrosion rate and the overcritical indirect air cooling unit circulation corrosion control skill being controlled to corrosion rate
Art.
Brief description of the drawings
Fig. 1 is the electrochemical state process of reconstruction schematic diagram of 1050A fine aluminiums/pure water corrosion system of the present invention.
Fig. 2 is the electrokinetic potential scanning polarization curve of embodiment 1；
Fig. 3 is the electrokinetic potential scanning polarization curve of embodiment 2；
Fig. 4 is the electrokinetic potential scanning polarization curve of embodiment 3；
Fig. 5 is the electrokinetic potential scanning polarization curve of embodiment 4；
Fig. 6 is the electrokinetic potential scanning polarization curve of embodiment 5；
Fig. 7 is the electrokinetic potential scanning polarization curve of embodiment 6.
Embodiment
In order that technical problems, technical solutions and advantages to be solved are clearer, clear, tie below
Drawings and examples are closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only
To explain the present invention, it is not intended to limit the present invention.
The present invention provides a kind of indirect air cooling unit circulation process for corrosion control, comprises the steps of：
S1, configures reducing agent, the component of component A and 0-60 parts by weight of the reducing agent comprising 20.0-100.0 parts by weight
B, the component A include hydrazine hydrate；The component B includes L-AA；
S2, detects the pH value of circulation；
S3, as circulation pH≤8.5:The reducing agent is added to circulation, the concentration of hydrazine is controlled
：10 μ g/L-20 μ g/L, preferably 16 μ g/L；Ascorbic acid concentrations control exists：0μg/L.
As circulation pH>When 8.5, the reducing agent is added to circulation, the concentration of hydrazine is controlled：30
μ g/L-40 μ g/L, preferably 30 μ g/L；Ascorbic acid concentrations control exists：40μg/L.
Further, the component A is included on the basis of its gross weight：
80% hydrazine hydrate 20-60 parts by weight；
50% hydroxylamine solution AR 0-2.0 parts by weight；
Desalination water surplus.
Further, the component B is included on the basis of its gross weight：
The deoxidation catalyst is cobaltous sulfate or the dissolvable salt of other one or more cobalts.
Proper amount of gas deoxygenation conditioning agent, such as SO can also be added when needing into the circulatory system2.Gas deoxygenation conditioning agent
It is only used for recirculated water and occurs pH burst rise accident conditionses, adds SO2Control standard be control pH in Circulating Water be in
8.2-8.5 scope.
The reducing agent added into recirculated water, the selection suitably equilibrium potential of " coupling " anode reaction and electrode reaction
Exchanging electric current, it is possible to realize that corrosion system electrochemical state is rebuild, it is established that new corrosion potential causes original in sun
The 1050A fine aluminiums that pole state is corroded are transformed into the negative electrode state in new corrosion system, and realization is reduced as far as possible
1050A fine aluminiums corrosion rate or stop completely the 1050A fine aluminiums that may occur electrochemical corrosion best-of-breed technology target.
A kind of component hydrazine hydrate (N of reducing agent2H4·H2O), also known as hydrazine hydrate, hydrazine is in alkalescent, reaction with water reaction
Equation is as follows：
N2H4+H2O→N2H5 ++OH-Form positive monovalence hydrazine ion N2H5 +, (1)
First ionization constant is 1.0 × 10-6(298K)；
N2H4+2H2O→N2H6 2++ 2OH-, forms positive divalence hydrazine ion N2H6 2+, (2)
Secondary ionization constant is 9.0 × 10-16(298K)；
The reproducibility reaction of aqueous hydrazine：
N2H4+4OH—-4e-=N2+4H2O -1.15V SHE (3)
N2H5 +-5OH--4e-=N2+5H2O -0.23V SHE (4)
From the foregoing, it will be observed that the reducing agent of the present invention can realize the corrosion potential of regulation control corrosion rate electrode, and corruption can be adjusted
Electrode surface pH conditions are lost, are the chemical addition agents with dual-use function, are realized by the electrochemical state for adjusting corrosion system
The solution of control corrosion rate speed, this solution can both simplify system, reduce investment, predigested running maintenance work and
The low corrosion zero-emission of circulation running can be realized again by saving operating cost, reduce cost and the row of environmental protection treatment
Put the risk that waste water is brought.
Another component of reducing agent is ascorbic acid, is a kind of acid polyol containing 6 carbon atoms, molecule
Formula is C6H8O6, molecular weight is 176.1, and its dissociation constant is 4.3 (298K)
Ascorbic acid is that do not have carboxyl in a kind of lactone of unsaturated saccharic acid, molecule, its acid hydroxyl from enediol.
There is the allenic alcohol structure of ascorbic acid molecule structure the enediol base in very strong reproducibility, molecule can be oxidized to diketone
Base, easily oxidized agent oxidation generation hydroascorbic acid.Ascorbic acid is a kind of strong reductant, also can even if very weak oxidant
It is hydroascorbic acid (oxidized form) to be allowed to " conjugation chemical conversion ".Due to the standard electrode potential of two electro transfers of ascorbic acid
For -11mV (SHE), therefore its reduced form has relatively strong reproducibility, easily loses two electronics and becomes oxidized form.Reaction
Equation (5) describes the above-mentioned oxo reactionary process for losing electronics：
After the hydrazine hydrate and ascorbic acid add 1050A fine aluminiums/pure water corrosion system, spontaneous offer can be lost
The oxidation reaction of electronics：(3), (4), (5), and couple in corrosion system new anode current (iaN2H4With iaC6H8O6), with
Anodic attack electric current in 1050A fine aluminiums/pure water corrosion system is the corrosion current (i of aluminiumaAl) coupling forms new corrosion electrification
System.It is the unique cathode current coupled in 1050A fine aluminiums/pure water corrosion system that cathodic depolarization agent oxygen molecule, which obtains electronics,
(icO2)。
According to mixed potential theory：
The mixed potential equation of before processing：icO2=i0 aAl (6)
Mixed potential equation after processing：icO2=i1 aAl+iaN2H4+iaC6H8O6 (7)
Obviously：Added to 1050A fine aluminiums/pure water corrosion system after the two kinds of reducing agent processing of hydrazine and ascorbic acid, 1050A
The corrosion rate of fine aluminium diminishes.
i1 aAl=icO2-(iaN2H4+iaC6H8O6)<i0 aAl (8)
icO2The limiting diffusion current i of=oxygend：
In formula：N redox reaction receiving and losing electrons numbers, cathode reaction is in, under the conditions of alkaline pure water：O2+2H2O+4e-
=4OH-, n=4；
F:96500 coulombs/mol of Faraday constant；
D：Diffusion coefficient of the oxygen in water；
C:The concentration of dissolved oxygen；
δ：Thickness of diffusion layer.
The electrochemical state process of reconstruction of 1050A fine aluminiums/pure water corrosion system as described in Figure 1,
The corroding electrode reaction added before reducing agent:
Anode reaction：Al+4OH—-3e-=H2AlO3+H2O (10)
Cathode reaction：O2+2H20+4e-=4OH- (11)
The corroding electrode reaction added after reducing agent:
Anode reaction：
Al+4OH—-3e-=H2AlO3+H2O (10)
N2H4+4OH—-4e-=N2+4H2O (3)
N2H5 +-5OH--4e-=N2+5H2O (4)
Cathode reaction：
O2+2H2O+4e-=40H- (6)
According to corrosion electrochemistry on polarization and the theory of mixed potential, under mixed potential stable state, electrode surface
Total faraday's admittance of reaction is faraday's admittance sum of each electrode reaction, i.e. all anodes of corroding electrode surface coupling
Kinetic current sum is equal to the cathode reaction electric current sum of all couplings.So, if expanded in the limit reacted with negative electrode oxygen uptake
New anode reaction electric current is introduced in the anode reaction for dissipating current balance type, it is possible to original unique sun in reduction or inhibition system
Anode reaction (corrosion) electric current (i.e. corrosion rate) of pole kinetic current-aluminium, changes the mixed potential and corrosion electricity of corrosion system
Stream, reduces corrosion rate, realizes the technical purpose of the present invention.
Gone on to say below with experimental data：
The Ta Feier fitting data of table 1 collects
1050A pure water electrokinetic potential scanning polarization curve fitting data
| N2H4Concentration μ g/L | 0 | 16 | 40 | 80 | 120 |
| Corrosion potential VSCE | -0.37 | -0.45 | -0.42 | -0.43 | -0.57 |
| Corrosion current A/cm2 | 6.6×10-9 | 2.1×10-9 | 10.2×10-9 | 1.2×10-9 | 8.7×10-9 |
| Corrosion rate mm/a | 7.2×10-5 | 2.3×10-5 | 11.1×10-5 | 1.3×10-5 | 9.6×10-5 |
Electrokinetic potential scanning polarization curve achievement in research (table 1) is proved：After hydrazine is added, the corrosion potential of 1050A fine aluminiums
Cause original state (the zero hydrazine state) corrosion potential (- 0.37V SHE) of 1050A fine aluminiums relative to addition hydrazine to negative movement
Corrosion potential (- 0.45V SHE) afterwards is in a high position, i.e., the 1050A fine aluminiums in the corrosion system rebuild after adding hydrazine
Corrosion reaction has been in the cathode site of newly-built corrosion system.This is the core innovative point of the present invention.
In addition, passing through electrochemical impedance spectral technology, it was found that in hydrazine/1050A fine aluminiums-pure water corrosion system, hydrazine
It is a kind of Interfacial Adsorption type corrosion inhibiter；Hydrazine molecule and " hydrazine cation " prevent aluminium in 1050A surface of pure aluminum generation adsorbed film
Cathodic corrosion reaction (6) corrosion control mechanism, it is thus identified that corrosion control work(of the hydrazine to 1050A fine aluminiums in pure water environment
Energy.
After recirculated water addition hydrazine, the corrosion potential reduction of 1050A fine aluminiums enhances hydrazine in 1050A surface of pure aluminum
Suction-operated, obstructed corroding electrode micro cathode area oxygen uptake corroding cathode reaction, realize control and reduction 1050A fine aluminiums
The purpose of corrosion rate.Solve the control 1050A aluminium alloys technology that occurrence of large-area fast erosion is destroyed in the process of running
Problem.
Found by potentiostatic scanning polarization curve technology, electrochemical noise technology and ac impedance spectroscopy measuring technology：
1) hydrazine is a kind of cathode type corrosion inhibiter to 1050A fine aluminiums；
2) hydrazine is a kind of anodic corrosion inhibitor to carbon steel；
3) hydrazine-ascorbic acid " reproducibility binary economic benefits and social benefits corrosion control agent " is to cooling triangle water inlet pipe and water outlet pipe expansion joint flange
1050A fine aluminiums/Q235B carbon steel galvanic corrosions control action and control mechanism.
Adding hydrazine post-etching current potential according to corrosion electrochemistry principle, in 1050A fine aluminium circulations reduces and is in
The obvious phenomenon for now being raised with hydrazine concentration and reducing and (becoming negative) is proved：Hydrazine is a kind of cathode type corrosion inhibiter.Electrochemical impedance
Technology for detection illustrates that hydrazine is enhanced with electrode potential decline in the suction-operated of 1050A electrode surfaces.This phenomenon
Illustrate hydrazine molecule N2H4And hydrazine cation N2H5 +It is with corrosion potential decline in the coverage rate of 1050A fine aluminium electrode surfaces
Increase, so that 1050A fine aluminium circulation galvanic corrosions speed declines, realize effectively control 1050A fine aluminiums rotten
The technical purpose of erosion.
According to proton theory of acid base, hydrazine cation belongs to conjugate acid with hydrogen ion ability is lost, so that in recirculated water
Overall pH be under conditions of alkalescence (be more than 8.5) in absorption of the corroding electrode cathodic region due to conjugate acid (hydrazine cation)
Effect, realizes the protective effect to aluminum passivation film.Operational monitoring number is it was demonstrated that after addition hydrazine, recirculated water pH bursts are raised
Phenomenon disappear.
In the enterprising action electric potential scanning polarization measurement of CS310 type electrochemical workstations.Test uses three-electrode system, reference
Electrode is saturated calomel electrode, and auxiliary electrode is platinum electrode.All current potentials are the electricity relative to saturated calomel electrode in experiment
Place value.Corrosive medium is pure water and two series of simulation loop water containing aluminium and chlorion.
The method that corrosion potential and corrosion rate are accurately calculated according to Tafel curve is corrosion speed international at present
Rate determines most accurate method.The OCP of working electrode is first measured using electrochemical workstation, then under OCP
The Tafel curve of test job electrode, i.e. negative electrode and anodic polarization curves.Cathodic polarization curve and anodic polarization curves are cut
Line intersection point, is exactly required point, and the corresponding current potential of point is corrosion potential, and corresponding current density is corrosion electric current density.
Corrosion rate can accurately be obtained according to corrosion electric current density.So measurement obtains corrosion potential and corrosion current, with accurate
The characteristics of degree is high, error is small.
Based on reducing agent prescription and indirect air cooling unit circulation process for corrosion control more than, to different materials
Matter, the addition of the Circulating Water System of Air Cooling Unit of different PH, propose embodiment in detail below：
Embodiment 1：
The present embodiment provides a kind of indirect air cooling unit circulation process for corrosion control, and setting system is：
Material：1050A fine aluminiums；Corrosive medium：Pure water；pH 7.1；
The concentration of reducing agent each component is in configuration reducing agent, addition reducing agent to system above, control system：
Hydrazine：16μg/L(N2H4), ascorbic acid：0
After testing, as shown in Fig. 2 the electrochemical environment after addition reducing agent in system is：
Corrosion potential Ecorr=-0.45V SCE,
Corrosion rate：0.000023mm/a, the advanced international level less than 0.05mm/a.
Embodiment 2：
The present embodiment provides a kind of indirect air cooling unit circulation process for corrosion control, and setting system is：
Material：1050A fine aluminiums；Corrosive medium：Pure water；pH 7.1；
The concentration of reducing agent each component is in configuration reducing agent, addition reducing agent to system above, control system：
Hydrazine：40μg/L(N2H4), ascorbic acid：0.
After testing, as shown in figure 3, the electrochemical environment after addition reducing agent in system is：
Corrosion potential Ecorr=-0.66V SCE,
Corrosion rate：0.00014mm/a, the advanced international level less than 0.05mm/a.
Embodiment 3：
The present embodiment provides a kind of indirect air cooling unit circulation process for corrosion control, and setting system is：
Material：1050A fine aluminiums
Corrosive medium：Pure water, pH8.7
The concentration of reducing agent each component is in configuration reducing agent, addition reducing agent to system above, control system：
Aluminium：40μg/L Al3+, chlorion：156μg/L Cl-, hydrazine：40μg/L N2H4, ascorbic acid：16μg/L
C6H8O6)
After testing, as shown in figure 4, the electrochemical environment after addition reducing agent in system is：
Corrosion potential Ecorr=-0.66V SCE,
Corrosion rate：0.00010mm/a, the advanced international level less than 0.05mm/a.
Embodiment 4：
The present embodiment provides a kind of indirect air cooling unit circulation process for corrosion control, and setting system is：
Material：1050A fine aluminiums
Corrosive medium：Pure water, pH8.7
The concentration of reducing agent each component is in configuration reducing agent, addition reducing agent to system above, control system：
Aluminium：40μg/L Al3+, chlorion：156μg/L Cl-, hydrazine：16μg/L N2H4, ascorbic acid：0；
After testing, as shown in figure 5, the electrochemical environment after addition reducing agent in system is：
Corrosion potential Ecorr=-0.61V SCE,
Corrosion rate：0.00019mm/a, the advanced international level less than 0.05mm/a.
Embodiment 5：
The present embodiment provides a kind of indirect air cooling unit circulation process for corrosion control, and setting system is：
Material：304 stainless steels
Corrosive medium：Pure water, pH8.7
The concentration of reducing agent each component is in configuration reducing agent, addition reducing agent to system above, control system：
Aluminium：40μg/L Al3+, chlorion：156μg/L Cl-, hydrazine：40μg/L N2H4, ascorbic acid：16μg/L
C6H8O6；
After testing, as shown in fig. 6, the electrochemical environment after addition reducing agent in system is：
Corrosion potential Ecorr=-0.29V SCE,
Corrosion rate：0.00054mm/a, better than GB50050-2007《Code for design of industrial recirculating cooling water treatment》Regulation
Corrosion of Stainless Steel speed be less than 0.005mm/a standard requirement)
Embodiment 6：
The present embodiment provides a kind of indirect air cooling unit circulation process for corrosion control, and setting system is：
Material：Carbon steel
Corrosive medium：Pure water, pH8.7
The concentration of reducing agent each component is in configuration reducing agent, addition reducing agent to system above, control system：
Aluminium：40μg/L Al3+, chlorion：156μg/L Cl-, hydrazine：40μg/L N2H4, ascorbic acid：16μg/L
C6H8O6；
After testing, as shown in fig. 7, the electrochemical environment after addition reducing agent in system is：
Corrosion potential Ecorr=-0.35V SCE,
Corrosion rate：0.035mm/a, better than GB50050-2007《Code for design of industrial recirculating cooling water treatment》It is defined
Corrosion of carbon steel speed is less than 0.075mm/a standard requirement.)
Above example shows that reducing agent of the invention is a kind of new reproducibility binary economic benefits and social benefits corrosion control agent, as
New anode reaction electric current is introduced in 1050A fine aluminiums/demineralized water corrosion system, by hydrazine, ascorbic acid in the basic conditions
Oxidation reaction (3) (4) (5), change corrosion system mixed potential and corrosion current realize the present invention corrosion control purpose,
Successfully solve the skill for the indirect air cooling circulation corrosion control that 1050A fine aluminiums-three kinds of carbon steel-stainless steel material is constituted
Art problem, effectively controls the corrosion rate of 1050A fine aluminiums in the domestically leading level less than 0.005 millimeter/year.
Above by reference to the preferred embodiments of the present invention have been illustrated, not thereby limit to the interest field of the present invention.This
Art personnel do not depart from the scope of the present invention and essence, can have a variety of flexible programs to realize the present invention, for example as one
The feature of individual embodiment can be used for another embodiment and obtain another embodiment.All institutes within the technical concept with the present invention
Any modifications, equivalent substitutions and improvements made, all should be within the interest field of the present invention.
Claims (5)
1. a kind of indirect air cooling unit circulation process for corrosion control, it is characterised in that comprise the steps of：
Reducing agent is configured, the component B of component A and 0-60 parts by weight of the reducing agent comprising 20.0-100.0 parts by weight is described
Component A includes hydrazine hydrate；The component B includes L-AA；
Detect the pH value of circulation；
As circulation pH≤8.5, adding the reducing agent to recirculated water makes concentration control exist：The μ g/L-20 μ g/ of hydrazine 10
L；The μ g/L of ascorbic acid 0；
As circulation pH>When 8.5, adding the reducing agent to recirculated water makes concentration control exist：The μ g/L-40 μ g/ of hydrazine 30
L；The μ g/L of ascorbic acid 40.
2. indirect air cooling unit circulation process for corrosion control according to claim 1, it is characterised in that：
As circulation pH≤8.5, adding the reducing agent to recirculated water makes concentration control exist：The μ g/L of hydrazine 16；It is anti-bad
The μ g/L of hematic acid 0；
As circulation pH>When 8.5, adding the reducing agent to recirculated water makes concentration control exist：The μ g/L of hydrazine 30；Vitamin C
40 μ g/L of acid.
3. indirect air cooling unit circulation process for corrosion control according to claim 1,
It is characterized in that：The component A is included on the basis of its gross weight：
80% hydrazine hydrate 20-60 parts by weight；
50% hydroxylamine solution AR 0-2.0 parts by weight；
Desalination water surplus.
4. indirect air cooling unit circulation process for corrosion control according to claim 1, it is characterised in that：Described group
Part B is included on the basis of its gross weight：
5. indirect air cooling unit circulation process for corrosion control according to claim 4, it is characterised in that：It is described to remove
VPO catalysts are cobaltous sulfate or the dissolvable salt of other one or more cobalts.
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| CN114659380A (en) * | 2022-03-22 | 2022-06-24 | 西安热工研究院有限公司 | Method for inhibiting operation corrosion of air cooling island of direct air cooling unit based on oxidant |
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| CN103403226A (en) * | 2011-01-25 | 2013-11-20 | 栗田工业株式会社 | Anti-corrosive agent for boilers |
| JP2016148094A (en) * | 2015-02-13 | 2016-08-18 | 栗田工業株式会社 | Initial treatment agent for circulating cooling water and initial treatment method of circulating cooling water |
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| CN103403226A (en) * | 2011-01-25 | 2013-11-20 | 栗田工业株式会社 | Anti-corrosive agent for boilers |
| JP2016148094A (en) * | 2015-02-13 | 2016-08-18 | 栗田工業株式会社 | Initial treatment agent for circulating cooling water and initial treatment method of circulating cooling water |
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Cited By (2)
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| CN114659380A (en) * | 2022-03-22 | 2022-06-24 | 西安热工研究院有限公司 | Method for inhibiting operation corrosion of air cooling island of direct air cooling unit based on oxidant |
| CN114659380B (en) * | 2022-03-22 | 2024-03-12 | 西安热工研究院有限公司 | Method for inhibiting running corrosion of air cooling island of direct air cooling unit based on oxidant |
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| CN107228575B (en) | 2019-02-19 |
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