CN1226458C - Turbin steam condenser water chamber anticorrosion device and its manufacturing method - Google Patents
Turbin steam condenser water chamber anticorrosion device and its manufacturing method Download PDFInfo
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- CN1226458C CN1226458C CN 03135438 CN03135438A CN1226458C CN 1226458 C CN1226458 C CN 1226458C CN 03135438 CN03135438 CN 03135438 CN 03135438 A CN03135438 A CN 03135438A CN 1226458 C CN1226458 C CN 1226458C
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- hydroecium
- sacrificial anode
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Abstract
The present invention discloses an anti-corrosive facility of a water chamber of a turbine condenser, which uses a combined method of a coating layer and electrochemical protection and comprises an anti-corrosive coating layer with the thickness which is not less than 0.3mm and a galvanic anode protection device. The bottom layer of the coating layer is a hot aluminizing layer with the thickness of 0.08 to 0.20mm, and the surface layer of the coating layer is an epoxy coal pitch coating layer. The making method of the anti-corrosive coating layer of the water chamber comprises the steps that sand blasting treatment is carried out after cleaning and deoiling; hot aluminizing is carried out within four hours after the sand blasting, and the thickness of the aluminum layer can reach 0.08 to 0.20mm; epoxy coal pitch paint is coated in time after hot aluminizing. In an installing method of a sacrificial anode, the sacrificial anodes are welded on the water chamber and a closed tube, and the distribution of the sacrificial anodes makes protected parts positioned within the range of the protective potential of the sacrificial anodes. The present invention has obvious effects that anti-corrosive effect is good, and cost is low; the corrosion of the water chamber is effectively controlled, and a service life is greatly raised; stopping accidents caused by the corrosion is reduced; the economic benefit of users is increased.
Description
Technical field
The present invention relates to a kind of protection against corrosion facility, particularly a kind of turbine condenser hydroecium protection against corrosion facility and preparation method thereof.
Background technology
Heat exchanger tube in the turbine condenser has huge heat exchange area, constitutes galvanic corrosion system on the macroscopic views with carbon steel hydroecium and end tube sheet etc. thereof in the water coolant system, and the former has the current potential of calibration, is negative electrode; The latter has negative current potential, is anode.The area ratio of cathode and anode is 60～80: 1, and the galvanic couple structure of this big negative electrode primary anode can make the corrosion speed at anode position become tens of times quickening.Hydroecium internal surface, end tube sheet water side, closed tube internal surface carry out line with rubber, are coated with protective system etc., only corrosive medium and anode material can be isolated, and slow down corrosion speed, and corrosive takes place and development but can not fundamentally eliminate.Therefore, seek a kind of reasonable, effectively anticorrosion technique measure, become the urgent and important task in present technique field.
Summary of the invention
Purpose of the present invention is exactly in order to overcome the shortcoming of existing anticorrosion technique, and protection against corrosion facility that a kind of coating, electro-chemical protection combine and preparation method thereof is provided, and has controlled the corrosion of hydroecium effectively.
Technical solution of the present invention is:
Turbine condenser hydroecium protection against corrosion facility comprises erosion shield and cathodic protector, it is characterized in that: the bottom of described erosion shield is the aluminium-plated or aluminium alloy layer of heat, and the top layer is the heavy-duty coating coating, and this coating is an epoxy coal tar coating; Described cathodic protector is a sacrificial anode protection device.
When water speed≤2.0m/s, described sacrificial anode protection device to the protection potential and the protective current density of each parts in the hydroecium is:
With respect to the protection potential Vp of mercurous chloride electrode, V (SCE) protective current density Ip, mA/m
2
Heat exchanger tube-0.84～-1.04 15～150
Closed tube-0.79～-1.10 10～100
Hydroecium sphere wall-0.79～-1.10 10～60
End tube sheet-0.79～-1.10 40～150.
The top layer of described erosion shield is epoxy coal tar coating preferably.
Total thickness 〉=the 0.3mm of described erosion shield, wherein the thickness of hot sprayed-on Al layer is 0.08～0.20mm.
The sacrificial anode material of described sacrificial anode protection device is a kind of of zinc-aluminium-cadmium alloy, aluminium-zinc-indium-cadmium alloy, magnesium-aluminum-zinc-manganese alloy, iron.
The making method of described erosion shield comprises the steps: hydroecium sphere wall internal surface, end tube sheet water side surface, closed tube internal surface
(1). derusting by sandblast is handled after cleaning oil removing;
(2). hot aluminium-plated in 4 hours after the sandblasting, thickness reaches 0.08～0.20mm;
(3). the aluminium-plated back brushing of heat epoxy carbobitumen priming one time;
(4). the epoxide coal bituminous finish paint of brushing is one time behind (3) described priming paint surface drying, and sacrificial anode is installed simultaneously;
(5). brush epoxide coal bituminous finish paint again, until total coating thickness more than 0.3mm.
The installation method of described sacrificial anode protection device: sacrificial anode material is welded on hydroecium sphere wall, the closed tube, and its distribution should make in protected the scope that all is in the sacrificial protection current potential; The damaged position of the welding of coating recoats brush ring oxygen coal-tar pitch.
Unusual effect of the present invention is: favorable anti-corrosion effect, cost are low; Controlled the corrosion of hydroecium effectively, increase substantially work-ing life; Reduced the stopping accident that causes because of corrosion; User's remarkable in economical benefits improves.
Description of drawings
Fig. 1 is turbine condenser hydroecium and protection against corrosion facility synoptic diagram thereof.
Embodiment
Below in conjunction with drawings and Examples in detail the present invention is described in detail.
The hydroecium structure of turbine condenser is as shown in Figure 1: hydroecium 1 is made up of a sphere wall 3,2 butt joints of end tube sheet, and sphere wall 3 is provided with closed tube 4, holds tube sheet 2 to be connected with heat exchanger tube 7.
Make erosion shield 5 at sphere wall 3 internal surfaces, end tube sheet 2 water side surfaces and closed tube 4 internal surfaces earlier.Method is: earlier with derusting by sandblast after the surface cleaning oil removing, and hot more aluminium-plated protective layer, thickness reaches 0.10～0.15mm; Return rust for preventing to reoxidize after the sandblast, influence hot aluminium-plated effect, aluminium-plated should the carrying out as early as possible after derusting by sandblast of heat usually should be above 4 hours; The timely brushing epoxy carbobitumen priming in the aluminium-plated back of heat one time, the epoxide coal bituminous finish paint of brushing is one time behind the described priming paint surface drying.Sacrificial anode 6 is installed then, very close in view of the heat exchanger tube 7 on the end tube sheet 2, there are not enough areas to be used to install sacrificial anode 6, sacrificial anode 6 can only be installed on sphere wall 3, closed tube 4.Sacrificial anode material can adopt zinc-aluminium-cadmium alloy, or aluminium-zinc-indium-cadmium alloy, or magnesium-aluminum-zinc-manganese alloy, or iron, and is selected wherein a kind of according to different quality; And determine the distribution and the installation site of sacrificial anode 6 to make sure each sacrificial anode 6 in the scope of protection potential according to protection potential; In the mounting points of determining, wipe coating off, with sacrificial anode 6 firm welding, the epoxide coal bituminous finish paint of brushing comprehensively more at last, until all erosion shield 5 total thickness more than 0.3mm.
Whether electro-chemical protection current potential and current density be reasonable, will directly influence the result of use of sacrificial anode 6.Current potential is just in-700mV (SCE) in fresh water, and current potential just when-750mV (SCE), does not then have provide protection in the seawater, reaches sometimes-790mV (SCE) for Topically active point current potential, so the maximum value of protection potential should be more negative than this current potential.On the other hand, move on to when current potential is negative-when 1100mV (SCE) was above, hydrogen (H2 ↑) was separated out obvious increase, and coating 5 has the possibility of peeling off.The density of protective current should be selected for use according to different water quality and sealer, does not have a provide protection too for a short time, will increase sacrificial anode 6 materials consumptions too greatly again, strengthens the protection cost.Preferred protection potential of the present invention and protective current density (water speed≤2.0m/s) be:
With respect to the protection potential Vp of mercurous chloride electrode, V (SCE) protective current density Ip, mA/m
2
Heat exchanger tube-0.84～-1.04 15～150
Closed tube-0.79～-1.10 10～100
Hydroecium sphere wall-0.79～-1.10 10～60
End tube sheet-0.79～-1.10 40～150
In theory,, just can protect workpiece indefinitely, but be subjected to the restriction of operating mode and economic dispatch factor during practical application always as long as the sacrificial anode 6 of enough quality is arranged.Reach workpiece protection in indefinitely, need infinitely great space to place sacrificial anode 6, this is for limited workpiece to be protected space, and is impossible beyond doubt; On the other hand, endless fund input that endless sacrificial anode 6 is required also is impossible.Therefore, usually determine the consumption of sacrificial anode 6 according to user's time between overhaul (general power plant's time between overhaul is 4 years), a sacrificial anode 6 is changed in each overhaul, about four to five days of each overhaul time of power plant, sacrificial anode 6 is installed is only needed two to three days, not having all is rationally feasible technologically, economically.
The turbine condenser hydroecium adopts after the above-mentioned protection against corrosion facility, can obtain huge economic benefit.With 300,000 Kw units is example; cause the loss of shutdown because of the hydroecium corrosion; except that the Direct Loss of repairing hydroecium; 7,200,000 degree less generate electricity every day; 720,000 yuan of financial losses (by 0.1 yuan of rate for incorporation into the power network/degree); reparation was wanted more than the first quarter moon usually in summer, and the used time in other season is longer, at least 1,080 ten thousand yuan of accumulative total financial losses.And making of the present invention, use cost see the following form:
The manufacturing cost (table 1) of hydroecium protection against corrosion facility
| Unit capacity | 13.5 ten thousand Kw | 200,000 Kw | 300,000 Kw | 600,000 Kw |
| Application expense (ten thousand yuan) | 9.5～11.5 | 13～15 | 16～18 | 34～36 |
| Anode material takes (ten thousand yuan) | 5.0～6.5 | 8～9.5 | 11～12.5 | 25～28 |
| Anode mounting cost (ten thousand yuan) | 1.5 | 1.5 | 2.0 | 2.5 |
| Always take (ten thousand yuan) | 16.0～19.5 | 22.5～26.0 | 29～32.5 | 61.5～66.65 |
Hydroecium protection against corrosion facility is changed the required expense of anode (table 2)
| Unit capacity | 13.5 ten thousand Kw | 200,000 Kw | 300,000 Kw | 600,000 Kw |
| Anode material takes (ten thousand yuan) | 5.0～6.5 | 8～9.5 | 11～12.5 | 25～28 |
| Anode mounting cost (ten thousand yuan) | 1.5 | 1.5 | 2.0 | 2.5 |
| Always take (ten thousand yuan) | 6.5～8.0 | 9.5～11.0 | 13～14.5 | 27.5～30.5 |
Two totals, 90,000 yuan of hydroecium protection against corrosion facility annual cost the most about (32.5+14.5)/4 ≈ of 300,000 Kw units.
Be not difficult to find out that by above contrast the present invention can significantly improve the economic benefit of power plant.
Claims (6)
1. a turbine condenser hydroecium protection against corrosion facility comprises erosion shield and cathodic protector, it is characterized in that: the bottom of described erosion shield is the aluminium-plated or aluminium alloy layer of heat, and the top layer is the heavy-duty coating coating, and this coating is an epoxy coal tar coating; Described cathodic protector is a sacrificial anode protection device.
2. turbine condenser hydroecium protection against corrosion facility according to claim 1 is characterized in that: when water speed≤2.0m/s, described sacrificial anode protection device to the protection potential and the protective current density of each parts in the hydroecium is:
With respect to the protection potential Vp of mercurous chloride electrode, V protects current density Ip, mA/m
2
Heat exchanger tube-0.84～-1.04 15～150
Closed tube-0.79～-1.10 10～100
Hydroecium sphere wall-0.79～-1.10 10～60
End tube sheet-0.79～-1.10 40～150.
3. turbine condenser hydroecium protection against corrosion facility according to claim 1 is characterized in that: the total thickness 〉=0.3mm of described erosion shield, wherein the thickness of hot sprayed-on Al layer is 0.08～0.20mm.
4. turbine condenser hydroecium protection against corrosion facility according to claim 1 is characterized in that: the sacrificial anode material of described cathodic protector is a kind of of zinc-aluminium-cadmium alloy, aluminium-zinc-indium-cadmium alloy, magnesium-aluminum-zinc-manganese alloy, iron.
5. the making method of the erosion shield of the described protection against corrosion facility of claim 1 comprises the steps: hydroecium sphere wall internal surface, end tube sheet water side surface, closed tube internal surface
(1). derusting by sandblast is handled after cleaning oil removing;
(2). hot aluminium-plated in 4 hours after the sandblasting, thickness reaches 0.08～0.20mm;
(3). the aluminium-plated back brushing of heat epoxy carbobitumen priming one time;
(4). the epoxide coal bituminous finish paint of brushing is one time behind (3) described priming paint surface drying, and sacrificial anode is installed simultaneously;
(5). brush epoxide coal bituminous finish paint again, until total coating thickness more than 0.3mm.
6. the installation method of the sacrificial anode protection device of claim 1 or 2 described protection against corrosion facilities: sacrificial anode material is welded on hydroecium sphere wall, the closed tube, and its distribution should make in protected the scope that all is in the sacrificial protection current potential; The damaged position of the welding of coating recoats brush ring oxygen coal-tar pitch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03135438 CN1226458C (en) | 2003-07-21 | 2003-07-21 | Turbin steam condenser water chamber anticorrosion device and its manufacturing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03135438 CN1226458C (en) | 2003-07-21 | 2003-07-21 | Turbin steam condenser water chamber anticorrosion device and its manufacturing method |
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| Publication Number | Publication Date |
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| CN1478922A CN1478922A (en) | 2004-03-03 |
| CN1226458C true CN1226458C (en) | 2005-11-09 |
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| CN 03135438 Expired - Lifetime CN1226458C (en) | 2003-07-21 | 2003-07-21 | Turbin steam condenser water chamber anticorrosion device and its manufacturing method |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100432612C (en) * | 2007-01-23 | 2008-11-12 | 西安利能科技有限责任公司 | Shutdown maintaining method for directly air cooling system |
| CN102478366A (en) * | 2010-11-26 | 2012-05-30 | 李颖 | Multistage combined heat exchanging device |
| CN104386043B (en) * | 2014-11-20 | 2017-05-17 | 绵阳精合机电科技有限公司 | Automobile water spray tank with built-in rust-proof anticorrosive layer and rust-proof anticorrosive layer arranging method |
| CN106522355A (en) * | 2016-11-30 | 2017-03-22 | 广州市合信方园工业设备有限公司 | Corrosion-resistant steel integrated prefabricated pump station |
| JP6562096B2 (en) * | 2018-01-31 | 2019-08-21 | ダイキン工業株式会社 | Heat exchanger and air conditioner |
| CN111811160A (en) * | 2020-07-01 | 2020-10-23 | 同方节能装备有限公司 | Anticorrosion structure of lithium bromide unit water system |
| 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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| C56 | Change in the name or address of the patentee |
Owner name: DONGFANG ELECTRIC GROUP DONGFANG STEAM TURBINE CO. Free format text: FORMER NAME OR ADDRESS: DONGFAN STEAM TURBINE FACTORY |
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| CP01 | Change in the name or title of a patent holder |
Address after: 618201 Deyang City, Sichuan Province town of Hanwang Patentee after: DONGFANG TURBINE Co.,Ltd. DTC Address before: 618201 Deyang City, Sichuan Province town of Hanwang Patentee before: Dongfang Steam Turbine Plant |
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| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: DEC (GUANGZHOU) HEAVY MACHINERY Co.,Ltd. Assignor: DONGFANG TURBINE Co.,Ltd. DTC Contract fulfillment period: 2009.12.18 to 2015.12.18 Contract record no.: 2010440000052 Denomination of invention: Turbin steam condenser water chamber anticorrosion device and its manufacturing method Granted publication date: 20051109 License type: Exclusive license Record date: 20100105 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.12.18 TO 2015.12.18; CHANGE OF CONTRACT Name of requester: DONGFANG ELECTRIC (GUANGZHOU) HEAVY MACHINE CO., L Effective date: 20100105 |
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Granted publication date: 20051109 |