CN102288064B - Protection method for joint stop of air cooling island and unit - Google Patents
Protection method for joint stop of air cooling island and unit Download PDFInfo
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- CN102288064B CN102288064B CN 201110163913 CN201110163913A CN102288064B CN 102288064 B CN102288064 B CN 102288064B CN 201110163913 CN201110163913 CN 201110163913 CN 201110163913 A CN201110163913 A CN 201110163913A CN 102288064 B CN102288064 B CN 102288064B
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- 238000001816 cooling Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- REYJJPSVUYRZGE-UHFFFAOYSA-N Octadecylamine Chemical compound CCCCCCCCCCCCCCCCCCN REYJJPSVUYRZGE-UHFFFAOYSA-N 0.000 claims abstract description 13
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 7
- 238000012423 maintenance Methods 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 73
- 229910019142 PO4 Inorganic materials 0.000 claims description 19
- 239000010452 phosphate Substances 0.000 claims description 19
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 19
- 150000004985 diamines Chemical class 0.000 claims description 16
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 6
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 229910021529 ammonia Inorganic materials 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 10
- 239000002184 metal Substances 0.000 abstract description 10
- 229910052751 metal Inorganic materials 0.000 abstract description 10
- 239000000295 fuel oil Substances 0.000 abstract description 5
- 229910052742 iron Inorganic materials 0.000 abstract description 5
- 239000003245 coal Substances 0.000 abstract 1
- 239000000446 fuel Substances 0.000 abstract 1
- 230000001590 oxidative effect Effects 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 238000012797 qualification Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 7
- 238000005070 sampling Methods 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000011010 flushing procedure Methods 0.000 description 3
- 239000003643 water by type Substances 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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Abstract
The invention discloses a protection method for joint stop of an air cooling island and a unit. The method comprises the following steps of: 1) adjusting parameters before the air cooling unit is stopped; 2) injecting maintenance solution; 3) stopping the unit; and 4) draining. The method has the advantages that: octadecylamine is vaporized at the temperature of more than 450 DEG C, the gaseous octadecylamine enters a unit thermodynamic system and an air cooling system along with steam together to form a layer of hydrophobic protective film on the metal surface, and air is isolated from the metal after the unit is stopped, so that air is prevented from oxidizing and corroding the metal surface in relatively damp environment, a great amount of water is not required to be used for rinsing a system in the process of restarting the unit, the qualification time of iron content in circulating water during starting is effectively shortened, and the using amount of fuel oil or fuel coal is saved during starting.
Description
Technical field
The present invention relates to a kind of Air-Cooling Island and the unit method of stopping using, particularly a kind of Air-Cooling Island and Air-cooled Unit associating Shut-down Protection method.
Background technology
The steam of discharging after the steam turbine acting in the thermal power plant mainly adopts dual mode to carry out cooling and reclaims its condensate water, i.e. water cooling (water-cooled) and air cooling (air cooling).The most of Water Cooling Technology that adopts in existing thermal power plant, due to the water evaporation loss, need to consume a large amount of water, along with expanding economy, water resource day by day in short supply, the water intaking price rises year by year, directly causes the thermal power plant cost to increase, and the environmental issue that the while moisture contamination is brought is also more and more outstanding.Therefore traditional Water Cooling Technology more and more has been not suitable with the requirement in epoch, and air cooling technique is developed and used in countries in the world gradually, comprises indirectly coolingly and directly cooling, and application at present is Direct Air-Cooling Technology comparatively generally.
Adopt the cooling system of Direct Air-Cooling Technology to be called Direct Air-cooled Unit, the Air-Cooling Island of Direct Air-cooled Unit is a huge metal heat sink, its material major part is carbon steel, it is generally acknowledged that the corrosion of carbon steel is take electrochemical corrosion as main, and chemical attack is take the oxygen uptake corrosion as main, and Air-Cooling Island is during stopping transport, and internal environment is moist, relative humidity is close to saturated, so the oxygen uptake serious corrosion.
Air cooling island of direct air cooling unit is huge, and vapour, liquid phase coexist, and gas flow process complexity is various.Present Domestic does not also have ripe technology and research to Direct Air-cooled Unit and Air-Cooling Island maintenance outage, can not solve preferably the corrosion during Air-Cooling Island is stopped transport; When causing unit starting, iron content for a long time can not be qualified, wastes a large amount of wash waters; Extend the unit starting time, the waste great amount of fuel oil.The technical barrier such as the conventional rack shutdown maintaining method has that medicament dissolution is poor, phase skewness, maintenance effect are poor.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of Air-Cooling Island and Air-cooled Unit associating Shut-down Protection method, can effectively save flushing water, capable of saving fuel oil, and the qualified time of iron in circulating content can greatly shorten unit starting the time.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of Air-Cooling Island and Air-cooled Unit associating Shut-down Protection method, and described Air-cooled Unit comprises superheater, drum, economizer, pre feedwater pump, oxygen-eliminating device, condensate pump, diamine filling apparatus, phosphate filling apparatus and exhaust apparatus; Also comprise respectively the special-purpose Precerving liquid filling apparatus that docks with Air-Cooling Island input pipe and efferent duct and exhaust apparatus efferent duct; Described special-purpose Precerving liquid filling apparatus comprises Precerving liquid case and dispenser pump; Described exhaust apparatus docks with Air-Cooling Island; Its associating Shut-down Protection method comprises the following steps:
One) the Air-cooled Unit cunning is stopped front parameter adjustment; 1) dissolve respectively the furnace stopping maintenance liquid of desired concn in special-purpose Precerving liquid filling apparatus, diamine filling apparatus, phosphate filling apparatus; 2) the Air-cooled Unit cunning is stopped in front 3 hours, strengthen the feedwater ammonia residual, improve stove water water sample pH value to 9.5-10, the diamine filling apparatus of the condensate water of stopping transport subsequently and feedwater, Lu Shui stop adding phosphate, and carry out blow-off of boiler water, make that in stove water, phosphate content remains on below 0.5mg/L; Boiler feedwater flow remains on 600t/h, and steam water-level is closed continuous blowdown system of boiler lower than ordinary water level 10-100mm; 3) on-line chemical monitoring instrument the electrical conductivity table is stopped transport and closes isolating door before pH table, hydrogen post;
Two) filling Precerving liquid; The unit cunning stop to rated load 50% the time, and keep stable operation of unit, adjust the capacity of Air-cooled Unit secondary bypass, keeping the delivery temperature in exhaust apparatus exit is 60 ℃-70 ℃;
1) pass through special-purpose Precerving liquid filling apparatus to exhaust apparatus efferent duct filling Precerving liquid 700-800 kilogram;
2) when the superheated steam temperature during less than 450 ℃, by special-purpose Precerving liquid filling apparatus to the first condensate pump and the second condensate pump entrance filling Precerving liquid, start simultaneously the diamine filling apparatus to water supply preposition pump intake filling Precerving liquid, start the phosphate filling apparatus Precerving liquid of annotating in the drum; The above-mentioned Precerving liquid filling time is the 2-3 left and right, and during the Precerving liquid filling, superheat steam temperature should remain on 350 ℃-450 ℃;
Three) shut down; After the Precerving liquid filling was complete, the operational factor when Direct Air-cooled Unit is annotated according to Precerving liquid continued stable operation one hour; And continue sliding stopping, when superheater pressure was 2.0-2.4MPa, boiler is with pressure to discharge water, and residual heat drying;
Four) draining; With the hydrophobic discharge in Direct Air-cooled Unit.
Described Precerving liquid is octadecylamine.
the beneficial effect that adopts technique scheme to produce is: the Direct Air-cooled Unit cunning is stopped in process at system's a plurality of position filling octadecylamine, octadecylamine is in vaporization more than 450 ℃, the octadecylamine of gaseous state is along with steam enters unit thermodynamic system and air cooling system, form the layer of hydrophobic diaphragm in the metal surface, after shutting down, that air and metal is isolated, thereby prevent that air in relative wet environment is to the oxide etch of metal surface, need not to use a large amount of flushing waters that system is rinsed in the unit restart procedure, effectively shorten the qualified time of iron in circulating content when starting, save fuel oil or coal-fired use amount when starting.
Description of drawings
Fig. 1 is Air-Cooling Island and Air-cooled Unit structural representation.
In the accompanying drawings: 1, superheater; 2, stove water sampling mouth; 3, drum; 4, the first Precerving liquid filling point; 5, the second Precerving liquid filling point; 6, Air-Cooling Island; 7, the 3rd Precerving liquid filling point; 8, exhaust apparatus; 9, the 4th Precerving liquid filling point; 10, the first condensate pump; 11, the second condensate pump; 12, special-purpose Precerving liquid filling apparatus; 13, condensed water sampling point; 14, oxygen-eliminating device; 15, pre feedwater pump; 16, the 5th Precerving liquid filling point; 17, main feedwater sample point; 18, economizer; 19, sampler; 20, main steam sample point.
Further the present invention is described in detail below in conjunction with accompanying drawing.
The specific embodiment
A kind of Air-Cooling Island and Air-cooled Unit associating Shut-down Protection method, described Air-cooled Unit comprises superheater 1, drum 3, economizer 18, pre feedwater pump 15, oxygen-eliminating device 14, the first condensate pump 10, the second condensate pump 11, diamine filling apparatus, phosphate filling apparatus and exhaust apparatus 8; Also comprise respectively the special-purpose Precerving liquid filling apparatus 12 that docks with Air-Cooling Island 6 input pipes and efferent duct and exhaust apparatus 8 input pipes; Described special-purpose Precerving liquid filling apparatus 12 comprises Precerving liquid case and dispenser pump; Described exhaust apparatus 8 docks (referring to accompanying drawing 1) with Air-Cooling Island 6; Its key improvements is, unites the Shut-down Protection method and comprises the following steps:
One) the Air-cooled Unit cunning is stopped front parameter adjustment; 1) dissolve respectively the furnace stopping maintenance liquid of desired concn in special-purpose Precerving liquid filling apparatus 12, diamine filling apparatus, phosphate filling apparatus; 2) the Air-cooled Unit cunning is stopped in front 3 hours, strengthen the feedwater ammonia residual, improve stove water water sample pH value to 9.5-10, the diamine filling apparatus of the condensate water of stopping transport subsequently and feedwater, Lu Shui stop adding phosphate, and carry out blow-off of boiler water, make that in stove water, phosphate content remains on below 0.5mg/L; Boiler feedwater flow remains on 600t/h, and drum 3 water levels are closed continuous blowdown system of boiler lower than ordinary water level 10-100mm; 3) on-line chemical monitoring instrument the electrical conductivity table is stopped transport and closes isolating door before pH table, hydrogen post; At sliding stopped transport in first three hour diamine filling apparatus and the phosphate filling apparatus of stopping, and special-purpose Precerving liquid filling apparatus arranges three outlets, three outlet respectively with the second Precerving liquid filling points, the 3rd Precerving liquid filling point and the 4th Precerving liquid filling points are communicated with, wherein the second Precerving liquid filling point and the 3rd Precerving liquid filling point are located at respectively on the discharge duct of exhaust apparatus, and the 4th Precerving liquid filling point is located at the first condensate pump and the second condensate pump porch; And diamine filling apparatus and phosphate filling apparatus invariant position, the diamine filling apparatus is communicated with the water supply preposition pump intake, and phosphate filling apparatus and drum are communicated with; Before the filling Precerving liquid, dissolve the Precerving liquid of desired concn, i.e. octadecylamine in the Precerving liquid storage bin of diamine filling apparatus, special-purpose Precerving liquid filling apparatus and in the phosphate filling apparatus according to the standard that can make stove water water sample PH reach 9.5-10;
Two) filling Precerving liquid; The unit cunning stop to rated load 50% the time, can slide and stop to 300MW such as the rated load unit that is 600MW, keep stable operation of unit, adjust the capacity of Air-cooled Unit secondary bypass, keeping the delivery temperature in exhaust apparatus exit is 60 ℃-70 ℃;
1) by special-purpose Precerving liquid filling apparatus 12 to exhaust apparatus 8 efferent ducts filling Precerving liquid 700-800 kilograms, namely at the octadecylamine of the second Precerving liquid filling point and the 3rd Precerving liquid filling point filling 700-800 kilogram;
2) when the superheated steam temperature during less than 450 ℃, by special-purpose Precerving liquid filling apparatus 12 to the first condensate pump 10 and the second condensate pump 11 entrances filling Precerving liquids, start simultaneously the diamine filling apparatus to pre feedwater pump 15 entrance filling Precerving liquids, start the phosphate filling apparatus to the interior filling Precerving liquid of drum 3, the above-mentioned Precerving liquid filling time is 2-3 hour, and during the Precerving liquid filling, superheat steam temperature should remain on 350 ℃-450 ℃, the detection of taking a sample of the water that circulates at any time to unit in the Precerving liquid filling process or steam, for easy to detect, one cover sampler 19 and four sample points are set, four sample points comprise the stove water sampling point 2 of being located on drum 3, be located at the main steam sample point 20 on main steam line, be located at condensed water sampling point 13 and the main feedwater sample point 17 of being located at pre feedwater pump 15 outputs in the first condensate pump 10 and the second condensate pump 11 outlets, during Precerving liquid filling by sampler to main steam, main feedwater, condensate water and stove water sampling are analyzed, wherein pH value and electrical conductivity detected once in every ten minutes, the per half an hour detection of iron-holder and octadecylamine content once, when detected parameters exceeds allowed band, adjust Precerving liquid adding amount and filling speed according to relevant regulations,
Three) shut down; After the Precerving liquid filling was complete, the operational factor when Direct Air-cooled Unit is annotated according to Precerving liquid continued stable operation one hour; And continue sliding stopping, when superheater pressure was 2.0-2.4MPa, boiler is with pressure to discharge water, and residual heat drying;
Four) draining; With the hydrophobic discharge in Direct Air-cooled Unit, mainly get rid of oxygen-eliminating device, condenser hotwell, high-pressure heater vapour side and low-pressure heater vapour side are hydrophobic etc. should in time drain.
Described Precerving liquid is octadecylamine; octadecylamine is in vaporization more than 450 ℃; the octadecylamine of gaseous state is along with steam enters unit thermodynamic system and air cooling system; form the layer of hydrophobic diaphragm in the metal surface; after shutting down, that air and metal is isolated; thereby prevent that air in relative wet environment is to the oxide etch of metal surface; need not to use a large amount of flushing waters that system is rinsed in the unit restart procedure; effectively shorten the qualified time of iron in circulating content when starting, save fuel oil or coal-fired use amount when starting.
Claims (2)
1. an Air-Cooling Island and Air-cooled Unit associating Shut-down Protection method, described Air-cooled Unit comprises superheater (1), drum (3), economizer (18), pre feedwater pump (15), oxygen-eliminating device (14), the first condensate pump (10), the second condensate pump (11), diamine filling apparatus, phosphate filling apparatus and exhaust apparatus (8); Also comprise respectively the special-purpose Precerving liquid filling apparatus (12) that docks with Air-Cooling Island (6) input pipe and efferent duct and exhaust apparatus (8) efferent duct; Described special-purpose Precerving liquid filling apparatus (12) comprises Precerving liquid case and dispenser pump; Described exhaust apparatus (8) docks with Air-Cooling Island (6); It is characterized in that, associating Shut-down Protection method comprises the following steps:
One) the Air-cooled Unit cunning is stopped front parameter adjustment; 1) dissolve respectively the furnace stopping maintenance liquid of desired concn in special-purpose Precerving liquid filling apparatus (12), diamine filling apparatus, phosphate filling apparatus; 2) the Air-cooled Unit cunning is stopped in front 3 hours, strengthen the feedwater ammonia residual, improve stove water water sample pH value to 9.5-10, the diamine filling apparatus of the condensate water of stopping transport subsequently and feedwater, Lu Shui stop adding phosphate, and carry out blow-off of boiler water, make that in stove water, phosphate content remains on below 0.5mg/L; Boiler feedwater flow remains on 600t/h, and drum (3) water level is closed continuous blowdown system of boiler lower than ordinary water level 10-100mm; 3) on-line chemical monitoring instrument the electrical conductivity table is stopped transport and closes isolating door before pH table, hydrogen post;
Two) filling Precerving liquid; The unit cunning stop to rated load 50% the time, keep stable operation of unit, adjust the capacity of Air-cooled Unit secondary bypass, keeping the delivery temperature in exhaust apparatus exit is 60 ℃-70 ℃;
1) pass through special-purpose Precerving liquid filling apparatus (12) to exhaust apparatus (8) efferent duct filling Precerving liquid 700-800 kilogram;
2) when the superheated steam temperature during less than 450 ℃, by special-purpose Precerving liquid filling apparatus (12) to the first condensate pump (10) and the second condensate pump (11) entrance filling Precerving liquid, start simultaneously the diamine filling apparatus to pre feedwater pump (15) entrance filling Precerving liquid, start the phosphate filling apparatus to the interior filling of drum (3) Precerving liquid; The above-mentioned Precerving liquid filling time is 2-3 hour, and during the Precerving liquid filling, superheat steam temperature should remain on 350 ℃-450 ℃;
Three) shut down; After the Precerving liquid filling was complete, the operational factor when Direct Air-cooled Unit is annotated according to Precerving liquid continued stable operation one hour; And continue sliding stopping, when superheater pressure was 2.0-2.4MPa, boiler is with pressure to discharge water, and residual heat drying;
Four) draining; With the hydrophobic discharge in Direct Air-cooled Unit.
2. a kind of Air-Cooling Island according to claim 1 and Air-cooled Unit are united the Shut-down Protection method, and it is characterized in that: described Precerving liquid is octadecylamine.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110163913 CN102288064B (en) | 2011-06-17 | 2011-06-17 | Protection method for joint stop of air cooling island and unit |
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| CN 201110163913 CN102288064B (en) | 2011-06-17 | 2011-06-17 | Protection method for joint stop of air cooling island and unit |
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| CN103423728A (en) * | 2013-08-13 | 2013-12-04 | 南京钢铁股份有限公司 | Boiler thermal state sliding-parameter shutdown method |
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| CN102818398B (en) * | 2012-07-25 | 2015-01-07 | 北京冶联科技有限公司 | Intelligent air cooling island and control method thereof |
| CN103322828A (en) * | 2013-05-23 | 2013-09-25 | 西安热工研究院有限公司 | Shutdown protection device of direct air cooled condenser of thermal power plant |
| CN105220136B (en) * | 2014-06-11 | 2018-02-09 | 北京京桥热电有限责任公司 | A kind of blowing out anti-corrosion guard method of waste heat boiler unit |
| CN110686230A (en) * | 2019-10-10 | 2020-01-14 | 王彦淳 | Method for adjusting pH value of boiler feed water |
| CN110819996A (en) * | 2019-11-15 | 2020-02-21 | 广州珠江天然气发电有限公司 | High-temperature film forming maintenance method for gas-steam combined cycle unit |
| CN112984613A (en) * | 2021-03-02 | 2021-06-18 | 华能山东石岛湾核电有限公司 | Maintenance method for nuclear power plant heating system during shutdown period |
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| CN100436938C (en) * | 2006-10-12 | 2008-11-26 | 山西省电力公司电力科学研究院 | Method for directly treating air cooling drum boiler unit water supply |
| 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 |
| JP2008249275A (en) * | 2007-03-30 | 2008-10-16 | Aquas Corp | Injection method of water treatment agent |
| CN101655335B (en) * | 2008-08-19 | 2011-08-03 | 华北电力科学研究院有限责任公司 | Device and method for thermal cleaning of direct air cooling system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103423728A (en) * | 2013-08-13 | 2013-12-04 | 南京钢铁股份有限公司 | Boiler thermal state sliding-parameter shutdown method |
| CN103423728B (en) * | 2013-08-13 | 2014-12-31 | 南京钢铁股份有限公司 | Boiler thermal state sliding-parameter shutdown method |
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