CN1102252A - Steam oxygenation blow-washing method - Google Patents
Steam oxygenation blow-washing method Download PDFInfo
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- CN1102252A CN1102252A CN 93119313 CN93119313A CN1102252A CN 1102252 A CN1102252 A CN 1102252A CN 93119313 CN93119313 CN 93119313 CN 93119313 A CN93119313 A CN 93119313A CN 1102252 A CN1102252 A CN 1102252A
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Abstract
The present invention relates to an oxygenated steam blow-wash method for boiler overheater and reheater of fossil-fuel power plant and steam power installation. It is characterized by that the mass velocity range of steam is more than 350 kg/s.m2 to less than 600 kg/s.m2, and its steam temp. range is more than 450 deg.C to equal to 550 deg.C. Said invention can make variable pressure and stable pressure blow washes, and the quantity of oxygenation is controlled by using variations of pressure and temp. of oxygen gas which are produced in the course of oxygenation and measured by pressure gauge and thermometer according to the equation of gas state, and its defined quantity of oxygenation is 0.3-1%. of steam quantity.
Description
The present invention relates to the superheater of heat power plant boiler and the steam oxygenation blow-washing method of reheater.
In the prior art, chemical cleaning method is generally adopted in the cleaning of heat power plant boiler superheater and reheater.Regulation is carried out Chemical cleaning to the reheater of the boiler more than the 17.4MPa in the boiler Chemical cleaning guide rule that China Ministry of Energy formulates, and during cleaning, must guarantee that velocity in pipes meets international standards promptly more than 0.15 meter per second.When superheater carries out Chemical cleaning, also be equipped with to prevent that vertical tube from producing the measure of vent plug and corrosion product deposition in pipe.The superheater majority of big capacity unit is made by austenitic steel, therefore can not adopt the chemicals that contains the halogen family element to clean, otherwise it is crisp easily to produce chlorine.And Chemical cleaning medication costliness has waste liquid after the cleaning, be unfavorable for environmental protection.
A kind of steam oxygenation blowpipe cleaning method is disclosed in Soviet Union's publication " power construction " (1985 the 6th phase 17-33 pages or leaves), and the method that adopts this method and Chemical cleaning to combine, be used for cleaning to the superheater of drum boiler and resuperheat formula direct current stove.In this steam oxygenation blowpipe cleaning method that the Soviet Union adopts, the steam that adopts adjacent boiler carries out the voltage stabilizing purge as the vapour source.Adopt steam oxygenation blow-washing to replace Chemical cleaning to have important Practical significance, can reduce expensive Chemical cleaning medication, reduce and clean waste liquid, help environmental protection.The mass velocity of the steam that this steam oxygenation blowpipe cleaning method that the Soviet Union adopts provides is 600-800 kilogram/rice
2Second, vapor (steam) temperature is 250 °-450 ℃.The final oxidation film corrosion resistance that forms of this method is better than NaNO
2Formed passivating film is generally used NaNO
2Carry out the corrosion resistant test CuSO of passivating film
4Droplet test is about 7min.But the weak effect of this purge because there is the dewfall phenomenon metal surface, has influenced the formation of oxide-film, and this cleaning method cost costliness.
In prior art, because the reheater sectional area is big, clean the cost height of reheater, thus reheater was not cleaned in the past, but when the reheater amount of scale buildup is big, can directly influence water and steam quality.The steam oxygenation blowpipe cleaning method of the Soviet Union also just is used for the cleaning to the superheater of drum boiler and resuperheat formula direct current stove, is not suitable for the cleaning to reheater.
The purpose of this invention is to provide a kind of steam oxygenation blowpipe cleaning method, adopt this method to have lowered scaling rate greatly, improved water and steam quality, the cleaning frequency of prolonged boiler and the service life of boiler.And enlarged clean range, except the superheater to drum boiler and resuperheat formula direct current stove cleans, can also the reheater of middle reheat-type direct current stove have been cleaned.Method provided by the invention reduces the blowpipe number of times, has shortened the cleaning duration, has saved fuel and water consumption, thereby reduces greatly and clean cost.And the minimizing noise more helps environmental protection.
The objective of the invention is to reach: the steam oxygenation blow-washing method to thermal power plant and apparatus of steam power plants boiler superheater and reheater of the present invention by following characteristics, whenever blowing once, pipe divides three phases, phase I is a steam flush, second stage is the superheated steam flushing that is added with oxygen, the addition of oxygen is 0.3-1 ‰, phase III is that whole systems carry out steam flush, steam has certain quality flow velocity and temperature range, it is characterized in that the mass velocity of steam is greater than 350kg/sm
2Extremely less than 600kg/sm
2Scope, vapor (steam) temperature for greater than 450 ℃ to the scope that equals 550 ℃, but transformation and voltage stabilizing purge, the control of oxygen-adding amount is according to gas equation (P
1V
1)/(T
1)=(P
2V
2)/(T
2) record the variation of oxygen pressure and temperature in the oxygenation process to determine that its oxygen-adding amount is the 0.3-1 ‰ of quantity of steam with Pressure gauge and thermometer.And the superheater of drum boiler is adopted the transformation blowpipe, regulates the control valve of main steam, when saturated vapour pressure from 0.9MPa-0.5MPa, blowpipe of every transformation 4 minutes, meanwhile, oxygenation is the 0.3-1 ‰ of quantity of steam, carries out whole systems steam flush then.The steam that steam oxygenation blowpipe cleaning method of the present invention adopts is self steam.
Method provided by the invention is compared with the steam oxygenation blowpipe cleaning method of the Soviet Union; superheat steam temperature with useful effect, Soviet Union's employing is 250 ℃-450 ℃; the present invention draws in vapor (steam) temperature during less than 350 ℃ by pipe cutting test; there is the dewfall phenomenon superheater tube metal surface; therefore can not form complete corrosion resistance diaphragm, cleaning performance is poor.And when vapor (steam) temperature formed coating mass the time greater than 550 ℃ bad, its corrosion resistance difference and crack performance is arranged.The vapor (steam) temperature that method provided by the invention adopts is 350 °-550 ℃, and at this moment the corrosion resistance of the formed diaphragm in metal surface of superheater or reheater tube is good, CuSO
4Droplet test is more than 12 minutes, and the thickness of diaphragm was never done the research to diaphragm thickness at 2-15 μ m in the prior art.In prior art, international corrosion resistance standard be 5 minutes for high anti-corrosion.The steam oxygenation cleaning method of the Soviet Union only discloses its corrosion resisting property and has reached and be equivalent to carry out the best passivating film that Chemical cleaning produced, i.e. NaNO
2Formed passivating film carries out CuSO
4The corrosion resistance that droplet test reached is about 7 minutes.In prior art, one minute corrosion resistance of every raising all will expend very big man-hour and cost and just can reach.And in the present chemical cleaning method; consider the factor of environmental protection; the concentration of chemicals is controlled in the scope of 0.5%-1%; the passivating film corrosion resistance of its formation was less than 2 minutes; boiler must start in one month for this reason; otherwise boiler tube can produce corrosion, influences the carbonated drink quality, consequently causes accidents such as boiler booster.In order to improve after cleaning the corrosion resistance of passivating film in the boiler tube, the Soviet Union has adopted 20% NaNO
2After carrying out Chemical cleaning, the corrosion resistance of the passivating film that is produced in the boiler tube just can reach the requirement of high corrosion-resistant, and high corrosion-resistant also can only reach 7 minutes.But, can not satisfy requirement on environmental protection, and NaNO because chemical concentration is too high
2Be again a kind of carcinogenic substance, so seldom adopt in the world at present.And the steam oxygenation blowpipe cleaning method that the Soviet Union adopts to reach 7 minutes corrosion resistance of low-alloy steel be hard-won.Cleaning method of the present invention can reach the corrosion resistance of low-alloy steel more than 12 minutes, and the corrosion resistance that can reach more than 120 minutes high-alloy steel is to be greatly improved, thereby has guaranteed that unit safety moves and prolonged the service life of boiler reliably.
The quality of steam flow velocity that the steam oxygenation blowpipe cleaning method of the Soviet Union adopts is 600-800kg/sm
2, and the present invention draws the quality of steam flow velocity by medium-sized test and only needs greater than 350kg/sm
2The method of the Soviet Union adopts bigger quality of steam flow velocity only the superheater of boiler to be cleaned, and can not be used for reheater, because the sectional area of reheater is big, bring up to 600-800kg/sm
2Be irrealizable.And it is crisp to be easy to generate chlorine with the method for Chemical cleaning for the boiler of being made by austenitic steel.So can't clean in the prior art, for regenerator.
The quality of steam flow velocity that method of the present invention provides has made the expanded range of cleaning, can not only be used for the cleaning of superheater, and can be used for the cleaning to reheater that prior art can be realized from the end.And as long as quality of steam flow velocity provided by the invention is in fact greater than 350kg/sm
2Just can reach equal cleaning performance, thereby save coal, water, oil, greatly reduce cost.Outside the carbonated drink quality is qualified, also guaranteed the unit safety economical operation.
Steam oxygenation blowpipe cleaning method of the present invention can carry out with self steam of boiler, and also available adjacent stove steam cleans.All be to clean in prior art, in cleaning process, must stop the unit of a normal power generation like this, use steam for supplying with boiler to be cleaned with adjacent stove steam.Adopt adjacent stove steam purge, the workload and the pipeline that need to increase installation pipeline connect complexity, lost time, consume the metal material and the energy.Can not satisfy simultaneously reheater and clean requirement to the quality of steam flow velocity, this also is the one of the main reasons that can not clean reheater in the prior art.
The method that adopts steam oxygenation blowpipe of the present invention to clean to the cleaning of the direct current stove of 500MW and the steam clean method ratio of oxygenation not, reduces the desalination water yield 71.9%.Using water wisely reaches 410,000 yuan.The steam oxygenation blowpipe cleaning method of the Soviet Union is used for the cleaning of the direct current stove of 250MW, compares with the steam clean method of oxygenation not, reduces desalination water yield 25-50 ‰.As seen the 500MW capacity unit that adopts method of the present invention reduces cost all than the 250MW unit using water wisely greatly of the method that adopts the Soviet Union.
Method of the present invention provides and can adopt the transformation steam oxygenation blow-washing to the drum boiler superheater, can adopt the voltage stabilizing purge to the superheater of direct current stove and the cleaning of reheater, thereby has enlarged the scope of cleaning.Superheater to drum boiler adopts the comparison of voltage stabilizing and the cleaning of transformation blowpipe to draw.Adopt transformation to clean cleaning to compare and adopt under the condition that same technical parameter cleans, can guarantee same cleaning quality, and can save coal, water, oil, save man-hour about 1/3rd with voltage stabilizing.
Through the pipe cutting inspection, after cleaning, the remaining dirt amount of the metal pipe internal surface of the direct current stove of employing Soviet Union cleaning method is less than 50g/m
2, adopt the remaining dirt amount of the direct current stove metal pipe internal surface of the inventive method to be 34g/m
2, adopt the interior remaining dirt of drum boiler tube of the cleaning method of the Soviet Union to measure less than 70g/m
2, and remaining dirt amount is less than 44.38g/m in the drum boiler tube of employing the inventive method
2As seen, adopting cleaning method of the present invention to compare descaling rate with the method for prior art has improved greatly.
The better embodiment of steam oxygenation blowpipe cleaning method of the present invention is further described by accompanying drawing.
Fig. 1. the quality of steam flow velocity is to the medium-sized simulated test of the influence of removing iron oxide dirt in the method for the invention;
Fig. 2. a better embodiment of the present invention, promptly adopt steam oxygenation blow-washing method schematic diagram of the present invention to the 220t/h boiler superheater;
Fig. 3. another better embodiment of the present invention, promptly adopt steam oxygenation blow-washing method schematic diagram of the present invention to 500MW unit 1650t/h boiler.
As can be seen from Fig. 1, curve is at 350kg/sm
2The time flex point appearred, obviously, the mass velocity of superheated steam will be controlled at greater than 350kg/sm
2, the remaining dirt amount that can make iron oxide on the metal surface unit are that is cleaned is less than 35g/m
2
The visible HTHP list drum Natural Circulation coal-powder boiler (drum boiler) that adopts the 220t/h of transformation blowpipe among Fig. 2.The pressure of this drum boiler is 110 atmospheric pressure.High-pressure oxygen cylinder is adopted in the adding of oxygen, adds drum after pressure-reducing valve reduces to 5MPa.Add the air gate that oxygen point is located at drum.At first open the oxygen cylinder outlet of oxygen cylinder pipe group 1 and adjust door 3, in the pressure stability of controlled pressure table 9 during at 13MPa, open the total door 3 of oxygen pressure adjustment ', adjust 3 ', make pressure P on Pressure gauge 9
1Greater than the pressure P on the Pressure gauge 10
2(P
1＞P
2), arrive Pressure gauge 10 through managing 2 by the diagram direction of arrow at the oxygen of oxygen cylinder pipe group 1.Steam inlet tube 15 and hydrophobic door 6 are fastened, oxygen by air gate 4,4 ', 4 " and 4 ' " join superheater 19.Simultaneously, steam enters drum 5 by steam inlet tube 15 through steam adjustment doors 17,18 and personal steam pipe 6.The pressure of input steam is controlled (not shown) by main control room, for the 60%-70% of boiler capacity is 132-154t/h, understand the steam-line blowing flow with the control room by the walkie-talkie contact, so that add oxygen simultaneously at blowpipe, its dosage is 0.3 ‰ of steam-1 ‰.From Pressure gauge control oxygen flow is 2.2-2.6kg/min, and each oxygenation time is 5min, once need add 11-13kg oxygen, and total oxygenation time is 1 hour, and oxygen demand is 132-157kg.Superheater 19 7 after pipeline 21 on sampling on the sampling head 26 that is provided with.Sampled oxygen-containing steam is through sampling cooler inlet valve 24, and stainless steel coiled pipe 23 and sampling cooler outlet valve 25 are adjusted to conventional flow and taken a sample.Through target plate sampling, target plate count less than 1mm have only 2 for qualified, reach than the higher requirement of national standard (it is 10 that the target plate of 1mm is counted).
That Fig. 3 represents is the voltage stabilizing blowpipe embodiment that is used for subcritical tower low range forced circulation boiler (direct current stove).Superheated steam is self steam, and temperature is 400-500 ℃, and the pressure of superheated steam is 9MPa, and average blowpipe flow should reach the 60-70% of boiler rating.Open all valves on the oxygen cylinder pipe group 41, by the female pipe 42 of oxygen, see that Pressure gauge 43 is stabilized in 13MPa, the temperature that recording thermometer 44 is shown, open the total door 45 of oxygen pressure adjustment to maximum opening, adjust Pressure gauges 47 with the total door 46 of oxygen pressure adjustment and reach until oxygen flow meter that to add oxygen flow be 16.5-19.25kg/min.Open high-pressure system and adjust door 51, when the pressure balance of Pressure gauge 52 and Pressure gauge 50, this moment, control valve 49 was to be in closed condition.By to superheater steam oxygenation blow-washing system 68 to the superheater oxygenation, pressure is 13-2MPa, each oxygenation time is 0.5-1 hour.When pressure when 13MPa reduces to 2MPa, when the pressure P of Pressure gauge 47
0' greater than the pressure P of Pressure gauge 50
1' (be P
0'＞P
1') time, open control valve 49, the perpendicular connecting leg 69 of Oxygen Flow warp this moment, high-pressure system oxygenation connecting leg 61 '-65 ', enter two-stage superheater bottom right header outlet 61 respectively.Lower collecting box outlet 62,63 in the two-stage superheater, the outlet 64 of two-stage superheater lower-left header and radiation superheater bottom right header outlet 65.Lead to superheater by direction shown in the arrow G among the figure.
Close high-pressure system and adjust door 51, open medium voltage network and adjust door 53,54.Pressure on the Pressure gauge 55 is 2MPa.At this moment, by superheater steam oxygenation blow-washing system 68 is switched to reheater is carried out steam oxygenation blow-washing system 81.High-pressure system adjustment door 51 is barred up, oxygen is adjusted door 53,54 and Pressure gauge 55 through medium voltage network, by the diagram dotted arrow direction vertical tube 83 of flowing through, horizontal connecting leg 71 ', 72 ', 73 ', 74 ', 75 ', enter high temperature reheater bottom right header inlet 71,72 respectively; High temperature reheater lower- left header inlet 73,74 and low-temperature reheater 75.Direction by arrow Z enters reheater.
Pressure P on Pressure gauge 55
3When 2MPa drops to 0.5MPa, close medium voltage network and adjust door 53,54, the grouping valve of closed control valve 49, the total door 46,45 of oxygen pressure adjustment and oxygen cylinder pipe group 41 simultaneously.At this moment finished primary steam oxygenation blow-washing process.Each with 80 bottles in oxygen cylinder, every bottle of oxygen volume is 6kg, each oxygenation time is that 0.5-1h carries out sample analysis on the outlet sampler of G, Z, principle is described identical with Fig. 2, repeat the aforesaid operations process, until the trace hole diameter sum of checking that impurity particle impacts on the target plate, during blowpipe, drop to peaked below 30% the last time.Present embodiment carries out 5 steam oxygenation blowpipes and cleans.
And adopt acid washing method in conjunction with not oxygenation steam-line blowing cleaning, after the superheater of another direct current stove (No. 1 stove) of 500MW and reheater adopted the HF pickling, just do not reach the qualified requirement of target plate behind the oxygenation blow-washing 6 times with common voltage stabilizing blowpipe again, but the chemicals of consume expensive, water, vapour and coal.The flow of superheated steam was the steam flow that 850-1000t/h approaches the above embodiment of the present invention when the blowpipe of another of 500MW direct current stove cleaned.
Three grades of present embodiment, level Four superheater and high temperature reheater through its dirt amount of measuring less than 35g/m
2And the present invention only just reaches than the better effect of the Chemical cleaning of prior art with steam oxygenation blow-washing without chemical pickling, and during the boiler starting, water and steam quality is qualified fast.Three, the level Four superheater is the austenite steel, adopts the acid washing method as No. 1 stove, and it is crisp easily to produce chlorine with the chemicals cleaning that contains the halogen family element, and the present invention can avoid this kind phenomenon.
Claims (3)
1, a kind of steam oxygenation blow-washing method to thermal power plant and apparatus of steam power plants boiler superheater and reheater, whenever blowing once, pipe divides three phases, phase I is a steam flush, second stage is the superheated steam flushing that is added with oxygen, the addition of oxygen is 0.3-1 ‰, and the phase III is that whole systems carry out steam flush, and steam has certain quality flow velocity and temperature range, it is characterized in that the mass velocity of steam is greater than 350kg/s.m
2Extremely less than 600kg/s.m
2Scope, vapor (steam) temperature for greater than 450 ℃ to the scope that equals 550 ℃, but transformation and voltage stabilizing purge, the control of oxygen-adding amount is according to gaseous state formula (P
1V
1)/(T
1)=(P
2V
2)/(T
2), the variation that records oxygen pressure and temperature in the oxygenation process with Pressure gauge and thermometer is to determine that its oxygen-adding amount is the 0.3-1 ‰ of quantity of steam.
2, the steam oxygenation blow-washing method of a kind of boiler superheater as claimed in claim 1 and reheater, it is characterized in that the superheater of drum boiler is adopted the transformation blowpipe, regulate the control valve of main steam, when saturated vapour pressure from 0.9MPa-0.5MPa, blowpipe of every transformation 4 minutes, meanwhile, oxygenation is the 0.3-1 ‰ of quantity of steam, carries out whole systems steam flush then.
3, a kind of steam oxygenation blowpipe cleaning method as claimed in claim 1 is characterized by, and the steam of employing is self steam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93119313 CN1038361C (en) | 1993-10-25 | 1993-10-25 | Steam oxygenation blow-washing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93119313 CN1038361C (en) | 1993-10-25 | 1993-10-25 | Steam oxygenation blow-washing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1102252A true CN1102252A (en) | 1995-05-03 |
| CN1038361C CN1038361C (en) | 1998-05-13 |
Family
ID=4992861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93119313 Expired - Fee Related CN1038361C (en) | 1993-10-25 | 1993-10-25 | Steam oxygenation blow-washing method |
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| Country | Link |
|---|---|
| CN (1) | CN1038361C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101915427A (en) * | 2010-08-20 | 2010-12-15 | 湖南省电力公司试验研究院 | Method for debugging boiler by pipe blowing |
| CN103912886A (en) * | 2014-03-19 | 2014-07-09 | 云南电力试验研究院（集团）有限公司电力研究院 | Intermittent supercritical unit stabilized-pressure pipe blowing method |
| CN110608633A (en) * | 2019-10-15 | 2019-12-24 | 中冶南方都市环保工程技术股份有限公司 | Boiler steam oxygenation depressurization blowing pipe system and method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9639676B2 (en) | 2012-05-31 | 2017-05-02 | Microsoft Technology Licensing, Llc | Login interface selection for computing environment user login |
-
1993
- 1993-10-25 CN CN 93119313 patent/CN1038361C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101915427A (en) * | 2010-08-20 | 2010-12-15 | 湖南省电力公司试验研究院 | Method for debugging boiler by pipe blowing |
| CN103912886A (en) * | 2014-03-19 | 2014-07-09 | 云南电力试验研究院（集团）有限公司电力研究院 | Intermittent supercritical unit stabilized-pressure pipe blowing method |
| CN110608633A (en) * | 2019-10-15 | 2019-12-24 | 中冶南方都市环保工程技术股份有限公司 | Boiler steam oxygenation depressurization blowing pipe system and method |
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| Publication number | Publication date |
|---|---|
| CN1038361C (en) | 1998-05-13 |
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