CN107228575B - 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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- CN107228575B CN107228575B CN201710507924.4A CN201710507924A CN107228575B CN 107228575 B CN107228575 B CN 107228575B CN 201710507924 A CN201710507924 A CN 201710507924A CN 107228575 B CN107228575 B CN 107228575B
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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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- 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, include: preparing reducing agent, the reducing agent includes hydrazine hydrate and L-AA；Detect the pH value of circulation；As circulation pH≤8.5, reducing agent: 10 μ g/L-20 μ g/L of hydrazine is added to recirculated water；Ascorbic acid concentrations: 0 μ g/L；As circulation pH > 8.5, reducing agent: 30 μ g/L-40 μ g/L of hydrazine is added to recirculated water；Ascorbic acid concentrations: 40 μ g/L.The present invention changes the electrochemical equilibrium in the circulatory system, reduces the galvanic corrosion speed in the circulatory system by the way that the reducing agent of compounding is added into circulation system.
Description
Technical field
The present invention relates to a kind of circulating water in turbine condenser processing techniques more particularly to a kind of indirect air cooling unit to recycle
Water system process for corrosion control.
Background technique
In recent years due to the anxiety of water resource, the water shortage in northwest and coal enriching area build the thermal power generation of high parameter
Unit has important and far-reaching meaning for extenuating coal transport power, conveying clear energy sources.Turbine condenser is using directly empty
Cold or indirect air cooling technology has become the inevitable choice of water shortage richness coal area construction electric power stations near coal-mines.
Indirect air cooling unit has passed on the advantages of wet type cooling unit and air cooling unit, and maximum feature is to make on a large scale
Use 1050A fine aluminium as the structural material of air cooling heat radiator, it is weary after steam turbine acting is absorbed using air cooled recirculated water
Vapour condenses released heat.For circulation as main auxiliary system, the reliability of service requirement is stronger, and area is huge
The aluminium radiator cost of big manufacturing process complexity is high, once corrosion and damage occurs, maintenance replacement time and effort consuming is caused huge straight
It connects and indirect economic loss.Therefore, reasonable water-chemical regime is organized, reduces system rate of metal corrosion to greatest extent to warp
Ji, energy saving, safe and reliable operation play the role of very important.
Indirect air cooling system using 1050A fine aluminium air cooling heat radiator is that the indirect air cooling unit of current domestic design is main
Type.Operational experience feedback proves, the circulation of this modular design although recirculated water has used the demineralized water of high quality,
But all occurs the sudden raising of recirculated water pH in constructin phase and operation, cause 1050A fine aluminium air cooling heat radiator and occur sternly
Heavy corrosion malicious event forces the production accident of compressor emergency shutdown, causes huge threat to indirect air cooling unit safety operation.
Indirect air cooling unit follows in water system that there is the different materials such as carbon steel, stainless steel, 1050A fine aluminium, these materials
Longtime running there are a variety of corrosion phenomenons (local corrosion and homogeneous corrosion) and is deposited under the corrosive environment containing oxygen and carbon dioxide
Complicated factor, indirect air cooling unit follows main corrosion form present in water system and includes:
1) cooling triangle inlet and outlet pipes expansion joint flange 1050A fine aluminium/Q235B carbon steel galvanic corrosion；
2) the cooling triangle recirculated water side homogeneous corrosion of 1050A fine aluminium and spot corrosion；
3) Q235B carbon steel condensing water conduit homogeneous corrosion；
4) Q235B carbon steel/304 stainless steel connecting flange galvanic corrosions；
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 aluminium can be simultaneously effective controlled
Corrosion and homogeneous corrosion are to guarantee indirect air cooling circulation and overcritical indirect air cooling generating set the safe and economic operation
Technical problem urgently to be resolved.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of corrosion of indirect air cooling unit circulation to control
Heavy corrosion occurs for method processed so that forcing compressor emergency shutdown to solve carbon steel, stainless steel and 1050A fine aluminium air cooling heat radiator
The problem of production accident.
In order to solve the above problem, the present invention proposes a kind of indirect air cooling unit circulation process for corrosion control, includes
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, the reducing agent, which is added, to recirculated water makes concentration control exist: 10 μ g/L- of hydrazine
20μg/L；0 μ g/L of ascorbic acid；
As circulation pH > 8.5, the reducing agent, which is added, to recirculated water makes concentration control exist: 30 μ g/L-40 of hydrazine
μg/L；40 μ g/L of ascorbic acid.
Further, as circulation pH≤8.5, the reducing agent, which is added, to recirculated water makes concentration control exist: connection
16 μ g/L of ammonia；0 μ g/L of ascorbic acid；
As circulation pH > 8.5, the reducing agent, which is added, to recirculated water makes concentration control exist: 30 μ g/L of hydrazine；It is anti-
40 μ g/L of bad hematic acid.
Further, the component A includes 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 includes 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 realizes, by the way that a kind of energy is added to recirculated water
It is enough fast and effeciently to adjust and change the 1050A fine aluminium air cooling heat radiator surface electrochemistry shape that area is huge, planform is complicated
State reducing agent carries out reproducibility processing to recirculated water, adjusts the electrochemical state of carbon steel, stainless steel and 1050A fine aluminium corrosion system
Realize the overcritical indirect air cooling unit circulation corrosion control skill for reducing corrosion rate and being controlled corrosion rate
Art.
Detailed description of the invention
Fig. 1 is the electrochemical state reconstruction process schematic diagram of 1050A fine aluminium/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.
Specific embodiment
In order to be clearer and more clear technical problems, technical solutions and advantages to be solved, 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 comprising the steps of:
S1, configures reducing agent, and the reducing agent includes the component of component A and the 0-60 parts by weight of 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, controls the concentration of hydrazine
: 10 μ g/L-20 μ g/L, preferably 16 μ g/L；Ascorbic acid concentrations control exists: 0 μ g/L.
As circulation pH > 8.5, the reducing agent is added to circulation, controls the concentration of hydrazine: 30
μ g/L-40 μ g/L, preferably 30 μ g/L；Ascorbic acid concentrations control exists: 40 μ g/L.
Further, the component A includes on the basis of its total 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 includes 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 regulator, such as SO can also be added when needing into the circulatory system2.Gas deoxygenation regulator
It is only used for recirculated water and pH burst raising accident conditions occurs, SO is added2Control standard be that control loop water pH value is in
The range of 8.2-8.5.
The reducing agent being added into recirculated water, the selection suitably equilibrium potential of " coupling " anode reaction and electrode reaction
Exchanging electric current, so that it may realize that corrosion system electrochemical state is rebuild, it is established that new corrosion potential makes originally in sun
The 1050A fine aluminium that pole state is corroded is transformed into the cathode state in new corrosion system, and realization reduces as far as possible
1050A fine aluminium corrosion rate or stop completely the 1050A fine aluminium 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 are reacted with water in alkalescent, 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-, form positive divalent hydrazine ion N2H6 2+, (2)
Secondary ionization constant is 9.0 × 10-16(298K)；
The reproducibility of aqueous hydrazine is reacted:
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 reducing agent of the invention is not only able to achieve the corrosion potential for adjusting control corrosion rate electrode, but also it is adjustable corruption
Electrode surface pH condition is lost, is the chemical addition agent with dual function, the electrochemical state by adjusting corrosion system is realized
The solution of control corrosion rate rate, this solution both can simplify system, reduce investment, simplify operation and maintenance and
Save operating cost may be implemented the low corrosion zero-emission of circulation operational process again, reduce cost and the row of environmental protection treatment
Put waste water bring risk.
Another component of reducing agent is ascorbic acid, is a kind of acid polyol containing 6 carbon atoms, molecule
Formula is C6H8O6, molecular weight 176.1, its dissociation constant is 4.3 (298K)
Ascorbic acid is a kind of lactone of unsaturated saccharic acid, does not have carboxyl, the acid hydroxyl from enediol in molecule.
The allenic alcohol structure of ascorbic acid molecule structure has very strong reproducibility, and the enediol base in molecule can be oxidized to diketone
Base is easily oxidized agent oxidation and generates hydroascorbic acid.Ascorbic acid is a kind of strong reductant, can very weak oxidant
" conjugation chemical conversion " is allowed to as hydroascorbic acid (oxidized form).Due to the standard electrode potential of two electronics transfers of ascorbic acid
For -11mV (SHE), therefore its reduced form has relatively stronger reproducibility, is easy to lose two electronics and becomes oxidized form.Reaction
Equation (5) describes the above-mentioned oxo reactionary process for losing electronics:
After 1050A fine aluminium/pure water corrosion system is added in the hydrazine hydrate and ascorbic acid, spontaneous provide can be lost
The oxidation reaction of electronics: (3), (4), (5), and new anode current (i is coupled in corrosion systemaN2H4With iaC6H8O6), with
Anodic attack electric current, that is, aluminium corrosion current (i in 1050A fine aluminium/pure water corrosion systemaAl) coupling forms new corrosion electrification
System.It is the unique cathode current coupled in 1050A fine aluminium/pure water corrosion system that cathodic depolarization agent oxygen molecule, which obtains electronics,
(icO2)。
According to mixed potential theory:
Mixed potential equation before processing: icO2=i0 aAl (6)
Treated mixed potential equation: icO2=i1 aAl+iaN2H4+iaC6H8O6 (7)
It is obvious: after the two kinds of reducing agent processing of hydrazine and ascorbic acid are added to 1050A fine aluminium/pure water corrosion system, 1050A
The corrosion rate of fine aluminium becomes smaller.
i1 aAl=icO2-(iaN2H4+iaC6H8O6)<i0 aAl (8)
icO2The limiting diffusion current i of=oxygend:
In formula: n redox reaction receiving and losing electrons number, in, cathode reaction under the conditions of alkaline pure water are as follows: O2+2H2O+4e-
=4OH-, n=4；
F: 96500 coulombs/mol of Faraday constant；
D: the diffusion coefficient of oxygen in water；
C: the concentration of dissolved oxygen；
δ: thickness of diffusion layer.
The electrochemical state reconstruction process of 1050A fine aluminium/pure water corrosion system as described in Figure 1,
The corroding electrode reaction before reducing agent is added:
Anode reaction: Al+4OH—-3e-=H2AlO3+H2O (10)
Cathode reaction: O2+2H20+4e-=4OH- (11)
The corroding electrode reaction after reducing agent is added:
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)
Theory according to corrosion electrochemistry about polarization and mixed potential, under mixed potential stable state, electrode surface
Total faraday's admittance of reaction is the sum of faraday's admittance of each electrode reaction, i.e. all anodes of corroding electrode surface coupling
The sum of kinetic current is equal to the sum of the cathode reaction electric current of all couplings.So if expanding with the limit of cathode oxygen-absorbing reaction
It dissipates in the anode reaction of current balance type and introduces new anode reaction electric current, so that it may original unique sun in reduction or inhibition system
Pole kinetic current-aluminium anode reaction (corrosion) electric current (i.e. corrosion rate) changes the mixed potential and corrosion electricity of corrosion system
Stream, reduces corrosion rate, realizes technical purpose of the invention.
It is continued to explain below with experimental data:
1 Ta Feier fitting data of table summarizes
1050A pure water electrokinetic potential scanning polarization curve fitting data
Electrokinetic potential scanning polarization curve research achievement (table 1) proves: after hydrazine is added, the corrosion potential of 1050A fine aluminium
To negative movement so that original state (the zero hydrazine state) corrosion potential (- 0.37V SHE) of 1050A fine aluminium is relative to addition hydrazine
Corrosion potential (- 0.45V SHE) afterwards has been in high-order, i.e., 1050A fine aluminium in the corrosion system rebuild after hydrazine is added
Corrosion reaction has been in the cathode site of newly-built corrosion system.This is core of the invention innovative point.
In addition, passing through electrochemical impedance spectral technology, it was found that in hydrazine/1050A fine aluminium-pure water corrosion system, hydrazine
It is a kind of Interfacial Adsorption type corrosion inhibiter；Hydrazine molecule and " hydrazine cation " generate adsorbed film in 1050A surface of pure aluminum and prevent aluminium
Cathodic corrosion reaction (6) corrosion control mechanism, it is thus identified that corrosion control function of the hydrazine to 1050A fine aluminium in pure water environment
Energy.
After adding hydrazine due to recirculated water, the corrosion potential reduction of 1050A fine aluminium enhances hydrazine in 1050A surface of pure aluminum
Suction-operated, obstructed corroding electrode micro cathode area oxygen uptake corroding cathode reaction, realize control and reduce 1050A fine aluminium
The purpose of corrosion rate.Solves the control 1050A aluminium alloy technology that occurrence of large-area fast erosion destroys in the process of running
Problem.
It is 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 aluminium；
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 inlet and outlet pipes expansion joint flange
1050A fine aluminium/Q235B carbon steel galvanic corrosion control action and control mechanism.
Adding hydrazine post-etching current potential according to corrosion electrochemistry principle, in 1050A fine aluminium circulation reduces and is in
The obvious phenomenon for now increasing with hydrazine concentration and reducing and (becoming negative) proves: hydrazine is a kind of cathode type corrosion inhibiter.Electrochemical impedance
Technology detection illustrate hydrazine the suction-operated of 1050A electrode surface be with electrode potential decline and enhance.This phenomenon
Illustrate hydrazine molecule N2H4And hydrazine cation N2H5 +The coverage rate of 1050A fine aluminium electrode surface be with corrosion potential decline and
Increase, so that 1050A fine aluminium circulation galvanic corrosion rate declines, it is rotten to realize effectively control 1050A fine aluminium
The technical purpose of erosion.
According to proton theory of acid base, hydrazine cation belongs to conjugate acid with hydrogen ion ability is lost, thus in recirculated water
Whole pH be under conditions of alkalinity (be greater than 8.5) in corroding electrode cathodic region due to the absorption of conjugate acid (hydrazine cation)
Effect realizes the protective effect to aluminum passivation film.It was demonstrated that after addition hydrazine, recirculated water pH burst increases operational monitoring number
The phenomenon that disappear.
In the enterprising action electric potential scanning polarization measurement of CS310 type electrochemical workstation.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 test
Place value.Corrosive medium is pure water and two series of simulation loop water containing aluminium and chloride ion.
It is corrosion speed international at present according to the method that Tafel curve accurately calculates corrosion potential and corrosion rate
Rate measures most accurate method.The open circuit potential that working electrode is first measured using electrochemical workstation, then under open circuit potential
The Tafel curve of test job electrode, i.e. cathode and anodic polarization curves.Cathodic polarization curve and anodic polarization curves are cut
Line intersection point, point required for being exactly, the corresponding current potential of point are corrosion potential, and corresponding current density is corrosion electric current density.
Corrosion rate can be accurately obtained according to corrosion electric current density.Measurement obtains corrosion potential and corrosion current in this way, and it is accurate to have
The feature that degree is high, error is small.
Based on restoring agent prescription and indirect air cooling unit circulation process for corrosion control above, 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 system is arranged are as follows:
Material: 1050A fine aluminium；Corrosive medium: pure water；pH 7.1；
Reducing agent is configured, addition reducing agent is to system above, the concentration of reducing agent each component in control system are as follows:
Hydrazine: 16 μ g/L (N2H4), ascorbic acid: 0
Through detecting, as shown in Fig. 2, the electrochemical environment after addition reducing agent in system are as follows:
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 system is arranged are as follows:
Material: 1050A fine aluminium；Corrosive medium: pure water；pH 7.1；
Reducing agent is configured, addition reducing agent is to system above, the concentration of reducing agent each component in control system are as follows:
Hydrazine: 40 μ g/L (N2H4), ascorbic acid: 0.
Through detecting, as shown in figure 3, the electrochemical environment after addition reducing agent in system are as follows:
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 system is arranged are as follows:
Material: 1050A fine aluminium
Corrosive medium: pure water, pH8.7
Reducing agent is configured, addition reducing agent is to system above, the concentration of reducing agent each component in control system are as follows:
Aluminium: 40 μ g/L Al3+, chloride ion: 156 μ g/L Cl-, hydrazine: 40 μ g/L N2H4, ascorbic acid: 16 μ g/L
C6H8O6)
Through detecting, as shown in figure 4, the electrochemical environment after addition reducing agent in system are as follows:
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 system is arranged are as follows:
Material: 1050A fine aluminium
Corrosive medium: pure water, pH8.7
Reducing agent is configured, addition reducing agent is to system above, the concentration of reducing agent each component in control system are as follows:
Aluminium: 40 μ g/L Al3+, chloride ion: 156 μ g/L Cl-, hydrazine: 16 μ g/L N2H4, ascorbic acid: 0；
Through detecting, as shown in figure 5, the electrochemical environment after addition reducing agent in system are as follows:
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 system is arranged are as follows:
Material: 304 stainless steels
Corrosive medium: pure water, pH8.7
Reducing agent is configured, addition reducing agent is to system above, the concentration of reducing agent each component in control system are as follows:
Aluminium: 40 μ g/L Al3+, chloride ion: 156 μ g/L Cl-, hydrazine: 40 μ g/L N2H4, ascorbic acid: 16 μ g/L
C6H8O6；
Through detecting, as shown in fig. 6, the electrochemical environment after addition reducing agent in system are as follows:
Corrosion potential Ecorr=-0.29V SCE,
Corrosion rate: 0.00054mm/a is provided better than GB50050-2007 " Code for design of industrial recirculating cooling water treatment "
Corrosion of Stainless Steel rate be less than 0.005mm/a standard requirements)
Embodiment 6:
The present embodiment provides a kind of indirect air cooling unit circulation process for corrosion control, and system is arranged are as follows:
Material: carbon steel
Corrosive medium: pure water, pH8.7
Reducing agent is configured, addition reducing agent is to system above, the concentration of reducing agent each component in control system are as follows:
Aluminium: 40 μ g/L Al3+, chloride ion: 156 μ g/L Cl-, hydrazine: 40 μ g/L N2H4, ascorbic acid: 16 μ g/L
C6H8O6；
Through detecting, as shown in fig. 7, the electrochemical environment after addition reducing agent in system are as follows:
Corrosion potential Ecorr=-0.35V SCE,
Corrosion rate: 0.035mm/a, better than as defined in GB50050-2007 " Code for design of industrial recirculating cooling water treatment "
Corrosion of carbon steel rate is less than the standard requirements of 0.075mm/a.)
Above embodiments show 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 aluminium/demineralized water corrosion system, under alkaline condition by hydrazine, ascorbic acid
Oxidation reaction (3) (4) (5), the mixed potential and corrosion current for changing corrosion system realize corrosion control purpose of the invention,
Successfully solve the skill for the indirect air cooling circulation corrosion control that 1050A fine aluminium-three kinds of carbon steel-stainless steel material is constituted
Art problem, effectively by the corrosion rate control of 1050A fine aluminium in the domestically leading level for being lower than 0.005 millimeter/year.
Preferred embodiments of the present invention have been described above with reference to the accompanying drawings, not thereby limiting the scope of the invention.This
Without departing from the scope and spirit of the invention, there are many variations to implement the present invention by field technical staff, for example as one
The feature of a embodiment can be used for another embodiment and obtain another embodiment.It is all to use institute within technical concept of the invention
Any modifications, equivalent replacements, and improvements of work, should all be within interest field of the 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 reducing agent includes the component B of component A and the 0-60 parts by weight of 20.0-100.0 parts by weight, described
Component A includes hydrazine hydrate；The component B includes L-AA；
Detect the pH value of circulation；
As circulation pH≤8.5, the reducing agent, which is added, to recirculated water makes concentration control exist: 10 μ g/L-20 μ g/ of hydrazine
L；0 μ g/L of ascorbic acid；
As circulation pH > 8.5, the reducing agent, which is added, to recirculated water makes concentration control exist: 30 μ g/L-40 μ g/ of hydrazine
L；40 μ g/L of ascorbic acid.
2. indirect air cooling unit circulation process for corrosion control according to claim 1, it is characterised in that:
As circulation pH≤8.5, the reducing agent, which is added, to recirculated water makes concentration control exist: 16 μ g/L of hydrazine；It is anti-bad
0 μ g/L of hematic acid；
As circulation pH > 8.5, the reducing agent, which is added, to recirculated water makes concentration control exist: 30 μ g/L of hydrazine；Vitamin C
40 μ g/L of acid.
3. indirect air cooling unit circulation process for corrosion control according to claim 1, it is characterised in that: described group
Part A includes 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 includes 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: described to remove
VPO catalysts are cobaltous sulfate or the dissolvable salt of other one or more cobalts.
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