CN102220584A - Dehumidifying and derusting technology used for hydraulic pressure test of evaporator - Google Patents
Dehumidifying and derusting technology used for hydraulic pressure test of evaporator Download PDFInfo
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- CN102220584A CN102220584A CN 201110082036 CN201110082036A CN102220584A CN 102220584 A CN102220584 A CN 102220584A CN 201110082036 CN201110082036 CN 201110082036 CN 201110082036 A CN201110082036 A CN 201110082036A CN 102220584 A CN102220584 A CN 102220584A
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Abstract
The invention relates to a dehumidifying and derusting technology used for a hydraulic pressure test of an evaporator, which comprises a derusting step in the hydraulic pressure test and a dehumidifying step after the hydraulic pressure test, wherein, the dehumidifying step after a hydraulic pressure test comprises a drying step, a first vacuum-pumping step, a first filling nitrogen step, a second vacuum-pumping step and a second filling nitrogen step. According to the invention, diamide and ammoniacal liquor are added in water of the hydraulic pressure test for substantially reducing the oxygen content in water, thereby the possibility that internal parts and the internal surface of the evaporator reacts with oxygen can be prevented; besides, the internal part of the evaporator is dried by a dehumidifier after the hydraulic pressure test, then the vacuum-pumping step and the nitrogen filling step are circulated twice, thereby the whole hydraulic pressure test and dehumidifying process can be completed in two days so as to achieve good dehumidifying effect, and new oxidation and corrosion can be avoided in the internal part of the evaporator after the hydraulic pressure test.
Description
Technical field
The present invention relates to a kind of dehumidifying anti-corrosive technology that is used for the test of vaporizer hydraulic pressure.
Background technology
In existing vaporizer hydraulic pressure test, used water is generally the A level water of RCCM standard code, yet, A level water belongs to neutral, and concentration of oxygen gas is higher, and steam generator secondary side internal surface and internals are carbon steel and low alloy steel, therefore, very easily with the oxygen generation iron rust that reacts; In addition, usually need after the water test is finished again, carrying out draining vacuumizes, fills hot nitrogen cycle displacement, vacuumizes the requirement that circulation four to six times like this could reach humidity≤30% substantially again, this dehumidification process is veryer long, usually needed just can finish in eight to ten days, and the oxidation corrosion of inner generation in this process, be difficult to remove in the later stage.In view of the foregoing, press for a kind of novel dehumidifying anti-corrosive technology of research and development now, to satisfy the needs of vaporizer hydraulic pressure test.
Summary of the invention
In order to solve the problem that above-mentioned prior art exists, the present invention aims to provide a kind of dehumidifying anti-corrosive technology that is used for the test of vaporizer hydraulic pressure, oxidation and rusting takes place in device in water test process He after the water test effectively to avoid evaporating, and shorten the whole water test and dehumidification process greatly, raise the efficiency.
A kind of dehumidifying anti-corrosive technology that is used for vaporizer hydraulic pressure test of the present invention, described technology comprise the step that dehumidifies after the antirust step and the water test in the water test, wherein,
Antirust step in the described water test adds diamine and ammoniacal liquor in the used water of the described water test, and makes the pH value of described water test institute water reach 10.3～10.7;
The dehumidifying step comprises the following steps after the described water test,
Drying step carries out drying to described vaporizer inside, stops drying after reaching Preset Time;
For the first time vacuumize step, described vaporizer inside is vacuumized, when this vaporizer pressure inside reaches the first default force value, and stop to bleed after stable;
Fill for the first time the nitrogen step, charge into the drying nitrogen of heat, after this vaporizer pressure inside reaches default second force value, stop inflation to described vaporizer inside;
For the second time vacuumize step, once more described vaporizer inside is vacuumized, after this vaporizer pressure inside reaches default the 3rd force value, stop to bleed;
Fill for the second time the nitrogen step, charge into the drying nitrogen of heat once more to described vaporizer inside, after this vaporizer pressure inside reaches default the 4th force value, stop inflation.
At the above-mentioned dehumidifying anti-corrosive technology that is used for the test of vaporizer hydraulic pressure, the concentration of the diamine in the described water test in the antirust step is 190～210ppm, and ammonia concn is 80%.
At the above-mentioned dehumidifying anti-corrosive technology that is used for the test of vaporizer hydraulic pressure, the Preset Time in the described drying step is 15～18 hours, and described vaporizer humidity inside was 15%～20% after drying was stopped.
At the above-mentioned dehumidifying anti-corrosive technology that is used for the test of vaporizer hydraulic pressure, vacuumizing first default in the step force value the described first time is 0.04bar.
At the above-mentioned dehumidifying anti-corrosive technology that is used for the test of vaporizer hydraulic pressure, fill in the nitrogen step in the described first time, the top temperature of described drying nitrogen is 200 ℃, and the described second default force value is 0.14bar, and after stopping inflation, keep this force value to reach 1 hour.
At the above-mentioned dehumidifying anti-corrosive technology that is used for the test of vaporizer hydraulic pressure, vacuumizing the 3rd default in step force value the described second time is 0.004bar.
The dehumidifying anti-corrosive technology that is used for the test of vaporizer hydraulic pressure above-mentioned filled in the nitrogen step in the described second time, and the top temperature of described drying nitrogen is 200 ℃, and described the 4th default force value is 0.21bar-0.35bar.
At the above-mentioned dehumidifying anti-corrosive technology that is used for the test of vaporizer hydraulic pressure, described technology is taken a sample to described vaporizer gas inside after also being included in and filling the nitrogen step for the second time, detects the humidity of this vaporizer.
At the above-mentioned dehumidifying anti-corrosive technology that is used for the test of vaporizer hydraulic pressure, described drying step is realized by connect a dehumidifier on described vaporizer.
At the above-mentioned dehumidifying anti-corrosive technology that is used for the test of vaporizer hydraulic pressure, fill the nitrogen step the described first time and fill the nitrogen step for the second time by on described vaporizer, being connected the realization of a portable nitrogen low temperature storage tank and a heating unit.
Owing to adopted above-mentioned technical solution, the present invention is at first by adding diamine and ammoniacal liquor in the used water of the water test, reducing the oxygen content in the water greatly, thus the possibility that has stoped vaporizer internals and internal surface and oxygen to react; In addition, after the water test, by dehumidifier drying is carried out in vaporizer inside earlier, and then the step that circulates and vacuumize for twice, fill hot nitrogen, thereby the whole water test and dehumidification process just can be finished greatly in two days, and reach good effect on moisture extraction, make vaporizer inside after the water test, avoid producing new oxidation and corrosion.
Description of drawings
Fig. 1 is the view of the vaporizer of a kind of dehumidifying anti-corrosive technology that is used for vaporizer hydraulic pressure test of the present invention when carrying out drying step;
Fig. 2 is the structural representation of the dehumidifier that adopts when carrying out drying step of a kind of dehumidifying anti-corrosive technology that is used for vaporizer hydraulic pressure test of the present invention;
Fig. 3 is the view that a kind of dehumidifying anti-corrosive technology that is used for the test of vaporizer hydraulic pressure of the present invention is carried out the vaporizer when filling for the first time the nitrogen step and filling the nitrogen step for the second time.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are elaborated.
The present invention, promptly a kind of dehumidifying anti-corrosive technology that is used for vaporizer hydraulic pressure test, it comprises the step that dehumidifies after the antirust step and the water test in the water test, wherein,
Antirust step in the water test adds concentration and is the diamine of 190～210ppm and concentration and be 80% ammoniacal liquor, and makes the pH value of water test institute water reach 10.3～10.7 in the used water of the water test;
The dehumidifying step comprises the following steps: after the water test
Drying step carries out drying to vaporizer inside, stops after reaching Preset Time; Preset Time in this step is 15～18 hours, and after drying stopped, the vaporizer humidity inside can reach 15%～20%;
For the first time vacuumize step, vaporizer inside is vacuumized, thereby the moisture of vaporizer inwall is further evaporated, when this vaporizer pressure inside reaches the first default force value, and stop to bleed after stable; First default in this step force value is 0.04bar;
Fill for the first time the nitrogen step, charge into the drying nitrogen of heat to vaporizer inside, thereby the water vapour of vaporizer inwall is replaced, further reduce water vapor concentration, after this vaporizer pressure inside reaches default second force value, stop inflation; The top temperature of drying nitrogen is 200 ℃ in this step, and the second default force value is 0.14bar, and after stopping inflation, keeps this force value to reach 1 hour;
For the second time vacuumize step, once more vaporizer inside is vacuumized, after this vaporizer pressure inside reaches default the 3rd force value, stop to bleed; The 3rd default in this step force value is 0.004bar;
Fill for the second time the nitrogen step, charge into the drying nitrogen of heat once more to vaporizer inside, after this vaporizer pressure inside reaches default the 4th force value, stop inflation, and, detect the humidity of this vaporizer the sampling of vaporizer gas inside; The top temperature of drying nitrogen is 200 ℃ in this step, and the 4th default force value is 0.21bar-0.35bar.
After antirust step promptly added diamine in the water test of the present invention in the A level water that the existing water test is adopted, diamine can react with the oxygen in the water, and chemical equation is as follows:
NH
2·NH
2+O
2＝2H
2O+N
2；
By following formula as can be known, adopt the advantage of diamine to be that the product that reacts is H
2O (water) and N
2(nitrogen) therefore can not generate the solid matter polluted water in vaporizer; In addition, ammoniacal liquor can be used for increasing the pH value in the water, and pH value is when big, and H+ ion and water molecules can weaken the positive polarity of two hydrogen originally, thereby can reduce O in the water
2The solubleness of (oxygen), therefore, adding diamine and ammoniacal liquor can reduce the oxygen content in the water greatly, thus the possibility that has stoped vaporizer internals and internal surface and oxygen to react.
See also Fig. 1, shown in Figure 2, drying step of the present invention is realized by connect a dehumidifier on vaporizer.Specifically, the processing gas inlet 11 of dehumidifier 1 is linked to each other with the secondary side manhole 21 of vaporizer 2 by connecting frock 3, handle the dry air outlet 12 by dehumidifier 1 of dry air that the back forms and be connected frock 3 and link to each other with two secondary side hand holes 22 of vaporizer 2 respectively, heat dehumidifier 1 inside and the dry moisture of removing even wet air enters by processing gas inlet 11, moisture by dehumidifier 1 internal recycling after (being the regeneration air inlet 13 and the wet air outlet 14 of dehumidifier 1) bring environment into, the air of handling after drying is divided into two tributaries through dry air outlet 12 and promptly connects two secondary side hand holes 22 that frocks 3 are sent to vaporizer 2 respectively by two, and the liquid crystal display 15 that so moves in circles until dehumidifier 1 shows that humidity reach requirement.The model that dehumidifier among the present invention can adopt Meng Te company to produce is the dehumidifier of ML1100.
As shown in Figure 3, fill the nitrogen step first time of the present invention and fill the nitrogen step for the second time by on vaporizer, being connected the realization of a portable nitrogen low temperature storage tank and a heating unit.Specifically, successively portable nitrogen low temperature storage tank 4 and heating unit 5 are connected to the secondary side hand hole 22 of vaporizer 2 by the hot nitrogen pipeline, and by some stopping valve 6, make and fill the nitrogen process and be divided into two operating modes, be that operating mode one enters vaporizer 2 for the nitrogen in the portable nitrogen low temperature storage tank 4 behind heating unit 5, thereby provide hot nitrogen to vaporizer 2, operating mode two is connected directly to vaporizer 2 for the nitrogen in the portable nitrogen low temperature storage tank 4, thereby provides normal temperature nitrogen to vaporizer 2; After vacuumizing, enabling two pairs of nitrogen of operating mode heats, about 180 ℃ of heated nitrogen temperature, the highest must not be above 200 ℃, through vacuumizing repeatedly and filling that sampling detects inner air humidity behind the nitrogen, can close operating mode two after meeting the demands, enable operating mode one, thereby vaporizer 2 inner pressure decline the carrying out nitrogen that produce owing to the temperature reduction are replenished.
Vacuumize step the first time of the present invention and vacuumize step for the second time and realize by vacuum pump being connected on the vaporizer pump water seal head.
In sum, the present invention has following advantage:
1, efficient height, time of drying is short, and rust-proof effect is good;
2, level of automation height reduces the human error operational risk.
Below embodiment has been described in detail the present invention in conjunction with the accompanying drawings, and those skilled in the art can make the many variations example to the present invention according to the above description.Thereby some details among the embodiment should not constitute limitation of the invention, and the scope that the present invention will define with appended claims is as protection scope of the present invention.
Claims (10)
1. a dehumidifying anti-corrosive technology that is used for vaporizer hydraulic pressure test is characterized in that, described technology comprises the step that dehumidifies after the antirust step and the water test in the water test, wherein,
Antirust step in the described water test adds diamine and ammoniacal liquor in the used water of the described water test, and makes the pH value of described water test institute water reach 10.3～10.7;
The dehumidifying step comprises the following steps after the described water test,
Drying step carries out drying to described vaporizer inside, stops drying after reaching Preset Time;
For the first time vacuumize step, described vaporizer inside is vacuumized, when this vaporizer pressure inside reaches the first default force value, and stop to bleed after stable;
Fill for the first time the nitrogen step, charge into the drying nitrogen of heat, after this vaporizer pressure inside reaches default second force value, stop inflation to described vaporizer inside;
For the second time vacuumize step, once more described vaporizer inside is vacuumized, after this vaporizer pressure inside reaches default the 3rd force value, stop to bleed;
Fill for the second time the nitrogen step, charge into the drying nitrogen of heat once more to described vaporizer inside, after this vaporizer pressure inside reaches default the 4th force value, stop inflation.
2. the dehumidifying anti-corrosive technology that is used for the test of vaporizer hydraulic pressure according to claim 1 is characterized in that the concentration of the diamine in the described water test in the antirust step is 190～210ppm, and ammonia concn is 80%.。
3. according to claim 1 or the described dehumidifying anti-corrosive technology that is used for the test of vaporizer hydraulic pressure, it is characterized in that the Preset Time in the described drying step is 15～18 hours, and described vaporizer humidity inside was 15%～20% after drying was stopped.
4. the dehumidifying anti-corrosive technology that is used for the test of vaporizer hydraulic pressure according to claim 1 is characterized in that vacuumizing first default in the step force value the described first time is 0.04bar.
5. the dehumidifying anti-corrosive technology that is used for the test of vaporizer hydraulic pressure according to claim 1, it is characterized in that, fill in the nitrogen step in the described first time, the top temperature of described drying nitrogen is 200 ℃, the described second default force value is 0.14bar, and after stopping inflation, keep this force value to reach 1 hour.
6. the dehumidifying anti-corrosive technology that is used for the test of vaporizer hydraulic pressure according to claim 1 is characterized in that vacuumizing the 3rd default in step force value the described second time is 0.004bar.
7. the dehumidifying anti-corrosive technology that is used for the test of vaporizer hydraulic pressure according to claim 1 is characterized in that fill in the nitrogen step in the described second time, the top temperature of described drying nitrogen is 200 ℃, and described the 4th default force value is 0.21bar-0.35bar.
8. the dehumidifying anti-corrosive technology that is used for the test of vaporizer hydraulic pressure according to claim 1 is characterized in that, described technology is taken a sample to described vaporizer gas inside after also being included in and filling the nitrogen step for the second time, detects the humidity of this vaporizer.
9. the dehumidifying anti-corrosive technology that is used for the test of vaporizer hydraulic pressure according to claim 1 is characterized in that, described drying step is realized by connect a dehumidifier on described vaporizer.
10. the dehumidifying anti-corrosive technology that is used for the test of vaporizer hydraulic pressure according to claim 1, it is characterized in that, fill the nitrogen step the described first time and fill the nitrogen step for the second time by on described vaporizer, being connected the realization of a portable nitrogen low temperature storage tank and a heating unit.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105006257A (en) * | 2015-05-20 | 2015-10-28 | 大亚湾核电运营管理有限责任公司 | Drying device and method for secondary side of million-KW level pressurized water reactor nuclear power station evaporator |
| CN110441158A (en) * | 2019-08-19 | 2019-11-12 | 江苏龙净节能科技有限公司 | A kind of coiled pipe heat exchange module hydraulic test method |
| CN111716609A (en) * | 2020-07-08 | 2020-09-29 | 常州佳冠电子有限公司 | Pouring equipment and pouring process for capacitor epoxy resin |
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| CN101947529A (en) * | 2010-09-02 | 2011-01-19 | 东莞市飞尔液晶显示器有限公司 | Liquid crystal display screen hollow cell cleaning process before crystal filling |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105006257A (en) * | 2015-05-20 | 2015-10-28 | 大亚湾核电运营管理有限责任公司 | Drying device and method for secondary side of million-KW level pressurized water reactor nuclear power station evaporator |
| CN105006257B (en) * | 2015-05-20 | 2018-02-13 | 大亚湾核电运营管理有限责任公司 | The drying device and method of kilowatt pressurized water reactor nuclear power station evaporator secondary side |
| CN110441158A (en) * | 2019-08-19 | 2019-11-12 | 江苏龙净节能科技有限公司 | A kind of coiled pipe heat exchange module hydraulic test method |
| CN110441158B (en) * | 2019-08-19 | 2022-04-05 | 江苏龙净节能科技有限公司 | Water pressure test method for coiled tube heat exchange module |
| CN111716609A (en) * | 2020-07-08 | 2020-09-29 | 常州佳冠电子有限公司 | Pouring equipment and pouring process for capacitor epoxy resin |
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Application publication date: 20111019 |