CN105220136B - A kind of blowing out anti-corrosion guard method of waste heat boiler unit - Google Patents
A kind of blowing out anti-corrosion guard method of waste heat boiler unit Download PDFInfo
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- CN105220136B CN105220136B CN201410257564.3A CN201410257564A CN105220136B CN 105220136 B CN105220136 B CN 105220136B CN 201410257564 A CN201410257564 A CN 201410257564A CN 105220136 B CN105220136 B CN 105220136B
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Abstract
The invention provides a kind of blowing out anti-corrosion guard method of waste heat boiler unit.This method is to realize that the blowing out anti-corrosion of waste heat boiler unit is protected by adding octadecylamine into waste heat boiler unit during furnace stopping maintenance.Method provided by the present invention is during waste heat boiler unit shutdown at sliding parameters; when boiler pressure, temperature are down to appropraite condition; filming amine is added to therrmodynamic system, one layer of unimolecule or polymolecular hydrophobic diaphragm are formed in heat power equipment inner surface, so as to reach the purpose for preventing metal erosion.
Description
Technical field
The present invention relates to the blowing out anti-corrosion guard method of waste heat boiler unit, belongs to waste heat boiler maintenance technical field.
Background technology
In terms of the investigation situation of the boiler maintenance of nationwide content, though the method for boiler anti-corrosion has special directive/guide,
But for for vertical exhaust-heat boiler, design form is novel, and mature experience is few, and the solution of the laying-up problem of the type of furnace is not
It is ripe.Designed and limit by the type of furnace, boiler is with pressure discharge water after ponding and can not easily dry, can not meet that conventional dry maintains mode
Maintenance requirement.And in general wet method maintenance mode can not meet shutdown maintenance demand.
Therefore, maintenance turns into the new problem that this area faces before the maintenance of vertical heater.
The content of the invention
In order to solve the above technical problems, it is an object of the invention to provide a kind of blowing out anti-corrosion of waste heat boiler unit guarantor
Maintaining method, by adding octadecylamine into waste heat boiler unit during furnace stopping maintenance, realize for waste heat boiler unit
Anti-corrosion protection.
To reach above-mentioned purpose, the invention provides a kind of blowing out anti-corrosion guard method of waste heat boiler unit, and it is wrapped
Include following steps：
(1) 3 hours starting troubles carry out firing up boosting before waste heat boiler shutdown, by auxiliary vapour header vapour source by reheating
Cold section of steam is changed to starting trouble offer；
(2) check that cold section of steam of reheating supplies turbine shaft seal vapour source, unlatching is cold hydrophobic for gland steam pipeline again, by pipeline
Temperature is warmed to the degree of superheat more than 50 DEG C in advance, and as standby shaft seal steam, preparation is put at any time；
(3) gas turbine, waste heat boiler, steam turbine, gen-set system are checked comprehensively before shutting down；
(4) check and correction each steam water-level meter of boiler before shutting down, the measured deviation between remote water-level meter and local water level meter is not
More than 30mm, remote water-level meter otherwise should be proofreaded again；
(5) Combined Cycle Unit total load is down to below 350MW；
(6) #1 gas turbines, #2 gas turbines, standby AC Lub oil pump, direct current thing belonging to #3 steam turbines are carried out respectively
Therefore oil pump, jacking(oil) pump firing test, confirm to start normal rear stoppage in transit；
(7) compressor emergency shutdown operation step sequence and generator off-the-line operation step sequence are write；
(8) steam turbine thermal stress remaining numerical value is recorded, combustion engine is released and coordinates control, combustion engine is kept by combustion engine load instruction
Steady load；
(9) two waste heat boilers are released into high pressure main steam and reheated steam desuperheating water automatically controls, adjust high pressure superheater
Device desuperheating water pitch and reheater desuperheating water pitch, each pitch aperture change 1%, control manually desuperheating water pitch aperture with by
Gradually reduce the temperature of main steam and the temperature of reheated steam；
(10) when main steam temperature declines 5 DEG C, stable operation 15 minutes and steam turbine heat-stress meter count value changes trend
It is further continued for cooling after stable, steam turbine high intermediate pressure cylinder and the swollen difference change of low pressure (LP) cylinder is monitored, when high intermediate pressure cylinder owning consumption reaches -1mm
When, low pressure (LP) cylinder owning consumption reaches -5mm, stops cooling；
(11) when the aperture of high-pressure superheater desuperheating water pitch reheated steam desuperheating water pitch is more than 70%, reduction is passed through
Combustion engine load, vapor (steam) temperature is reduced, steam turbine load is less than hydrophobic valve before 30MW unlatching steam turbine main inlet throttle-stop valves；
(12) repeat step (9)-(11), until combustion engine load is down to 70-80MW, combustion engine delivery temperature be down to 500 DEG C with
Under；
(13) when main steam temperature is less than 500 DEG C, octadecylamine is initially added into, and the temperature of main steam is maintained
500℃；
(14) after being initially added into octadecylamine, the point-to-point blowdown of steam water sampling, each blowing time of putting is 5 minutes；
(15) after being initially added into octadecylamine half an hour, start to be sampled carbonated drink, water sample includes：Condensate, 1# are low
Press stove water and 2# low pressure furnaces water, 1# low-pressure steams and 2# low-pressure steams, 1# medium pressure furnaces water and 2# medium pressure furnaces water, 1# middle pressure steams and
2# middle pressure steams, 1# pressure furnaces water and 2# pressure furnaces water, 1# high pressure superheated steams and 2# high pressure superheated steams, totally 13 water samples,
With the frequency of sample examination per hour once, the conductance of water sample, pH and octadecylamine content are chemically examined；
(16) it is confirmed whether to reach maintenance terminal according to the octadecylamine content of stove water, superheated steam；
(17) after octadecylamine adds, molten medicine-chest should be rinsed with demineralized water immediately, and continue to run with dosing pump 30min-
60min, fully rinse drug feeding pipeline；
(18) after the completion of dosing, molten medicine-chest is rinsed 1 hour, and dosing work is completed, and should be vented molten medicine-chest content demineralized water,
And to being cleared up in molten medicine-chest, noresidue in guard box；
(19) after the completion of maintaining, operate step sequence by compressor emergency shutdown and generator off-the-line operation step sequence performs operation, and according to
Drum 0.7MPa is with pressure to discharge water；
(20) after boiler discharge water completion 48 hours after, open two stoves, by the basic, normal, high, 2# stoves basic, normal, high of 1# stoves
Order, open six drum manhole doors, check one by one, and carry out hydrophobic test.
In the above-mentioned methods, it is preferable that the octadecylamine is according to 1 with demineralized water：9 mass ratio is mixed to get medicament
It is added after mixture.
In the above-mentioned methods, it is preferable that the pharmaceutical mixture is the preposition pump discharge of condensate in waste heat boiler unit
Added behind main pipe regulating valve.I.e. in the above-mentioned methods, chemical feeding points are：After the preposition pump discharge main pipe regulating valve of condensate,
Before dosing, answer manual service valve in front of the door at bottom emptying gallery, confirm former pipeline section blowoff valve without drainage.
In the above-mentioned methods, it is preferable that the pharmaceutical mixture is added by the filming amine chemicals dosing plant of packaged type
Add, the filming amine chemicals dosing plant of the packaged type is the conventional equipment of this area, such as portable protection of boiler during shutdown period chemicals dosing plant.
When adding medicament, the device should be connected to power supply, water source, and but ensure that connected power supply is in normal condition, it is ensured that #3 is sent out
Motor determine cold water moisturizing discharge water hand-operated valve can normal operating.
In the above-mentioned methods, it is preferable that the pharmaceutical mixture is added again after being heated to 40 DEG C.Implementing
Cheng Zhong, will can be dissolved in octadecylamine addition chemicals dosing plant (such as 100 kilograms of octadecylamines match somebody with somebody 900 kilograms of demineralized waters,
Totally 1 ton) and 40 DEG C are heated to, then carry out dosing operation on suitable opportunity.
In the above-mentioned methods, it is preferable that in step (9), the cooling rate control of the main steam and reheated steam is
Less than 1 DEG C/min；The pressure decrease speed control of the main steam and reheated steam is to decline less than 0.1MPa/ hours, pressure
Amount control be less than 0.5MPa/ hours；The degree of superheat control of the main steam and reheated steam is more than 100 DEG C；The main steaming
The control of the temperature difference of vapour and reheated steam is no more than 15 DEG C；The Wen Duxiajiang speed controls of the steam turbine cylinder be less than 1 DEG C/
min；It is no more than 1K/min that the DEH thermal stress criterion of the steam turbine, which calculates the control of remaining variation tendency,.
In the above-mentioned methods, in the case of before medicament does not add or without circulation time enough, it is impossible to
Shut down.
The maintenance margin of the above method provided by the present invention can be including waste heat boiler unit with lower part：
Condenser → condensate fore pump → condensate pump → low-pressure coal saver → low (middle and high) pressure drum → low (in,
It is high) pressure evaporator → low (middle and high) pressure superheater → high, medium and low cylinder pressure → condenser.
When implementing method provided by the present invention, the on-line chemical monitoring instrument of waste heat boiler unit is all stopped transport, and is closed
Instrument water intaking valve；Steam water sampling frame senior middle school low pressure feed water, senior middle school's low pressure furnace water, condensate, high, medium and low voltage superheated steam, reheating
Steam sampling pipe is unobstructed, condensed water deironing filter off-the-line, bypass door standard-sized sheet；Close drum platoon, determine valve, close low-pressure steam
Bag deoxygenation door, to reduce medicine waste, while strengthen monitoring each liquid level of steam drum (± 50mm) in normal range (NR)；According to online instrument
Table Con trolling index, confirm the high operation of limit 9.8 or so of feedwater, stove water pH value.
According to specific embodiments of the present invention, it is preferable that the blowing out anti-corrosion guard method of above-mentioned waste heat boiler unit
The step of also including assessing protection of boiler during shutdown period effect：
Hydrophobic test is observed：After shutdown, very first time progress hydrophobicity examination after high, medium and low voltage drum manhole door is opened
Test, and photograph to record；
Cupric sulphate dropping test：After shutdown, cupric sulphate dropping test and hydrophobic test are carried out, and photograph to record；
During blowing out, the frequency of maintenance effect inspection：After downtime January is exceeded, to high, medium and low voltage drum again
Hydrophobic test is carried out, checks that the frequency is set to 1 time/month；
Startup stage Steam-water Quality compares：After unit is again started up, the behaviour such as boiler flushing, steam turbine red switch, unit on-load
Make the stage, according to《Unit starting Steam-water Quality supervises form》It is outer to carry out normal supervision, increase feedwater, stove water, superheated steam
Octadecylamine assay；Contrasted according to the qualified speed of unit iron content and the qualified speed of unit starting water quality before,
Confirm whether block surfaces corrosion has declined during shutdown.If it is good to decline explanation maintenance effect, it is believed that complete
Into maintenance, illustrate that the effect of this maintenance is bad if do not declined.
In the above-mentioned methods, during adding medicine, declined to a great extent if there is pH, ammoniacal liquor measuring pump should be started immediately, together
When sodium hydroxide (such as 500g) is added into 1# phosphate batch meters, and start phosphate measuring pump and add to middle high-pressure drum
Medicine, to improve stove water pH value rapidly.
More than when Unit Steam Water circulation 4 is small or when the content of octadecylamine reaches 5-25mg/L, it is believed that
The terminal of maintenance is reached, adding medicine can be stopped.
Method provided by the present invention is during waste heat boiler unit shutdown at sliding parameters, when boiler pressure, temperature are down to
During appropraite condition, filming amine is added to therrmodynamic system, one layer of unimolecule or polymolecular hydrophobic are formed in heat power equipment inner surface
Diaphragm, so as to reach the purpose for preventing metal erosion.
The present invention uses octadecylamine film forming guard method, from chemical feeding points, unit steam load, administration timing of drug, steam
Temperature etc. optimizes, and obtains being suitable for the maintenance method of the maintenance demand of vertical Natural Circulation HRSG, have with
Lower significance：
1st, novel vertical Waste Heat Boiler Design problem is overcome, reaches maintenance effect, from actual maintenance result to octadecane
After the completion of the maintenance of base amine, whether ponding, which directly affects maintenance effect, judges, to each scientific research institutions are held not in the industry at present
Combed with viewpoint, the maturation of the maintenance method to the type of furnace has positive effect.
2nd, for vertical boiler, vapor (steam) temperature, chemical feeding points when control octadecylamine maintains, three pressure boiler protection liquid are ensured
It is well mixed as early as possible, reduces protection liquid mixing time, saves medicament expense and use, the economy of underrun during reduction blowing out
Loss；By maintenance and subsequent examination, successive optimization maintenance relevant parameter, final formulate is adapted to novel vertical waste heat boiler most to pass through
Ji, effective octadecylamine maintenance method.
3rd, reduce the washing time that is again started up of unit, while deposition can be reduced, reduce quantity of wastewater effluent, reach through
Benefit of helping and the purpose of social benefit doulbe-sides' victory.
4th, unit starting initial stage no matter combustion efficiency, or negative effect of the discharging of boiler amount to environmental protection is maximum, and
After combustion engine is grid-connected, Boiler Steam quality qualified time is reduced if being maintained by the octadecylamine after optimization, steam turbine red switch as scheduled,
Reach denitrating system to put into operation condition SCR inlet cigarette temperature prestissimo, ensure that smoke NOx content is up to standard as early as possible, in north
The enterprise in capital can further increase environmentally friendly social benefit.
Brief description of the drawings
Fig. 1-Fig. 3 is inspection record of the 1# stoves after octadecylamine maintenance；
Fig. 4-Fig. 6 is inspection record of the 2# stoves after octadecylamine maintenance.
Embodiment
In order to which technical characteristic, purpose and the beneficial effect of the present invention is more clearly understood, now to the skill of the present invention
Art scheme carry out it is described further below, but it is not intended that to the present invention can practical range restriction.
Embodiment
A kind of blowing out anti-corrosion guard method of waste heat boiler unit is present embodiments provided, it comprises the following steps：
(1) 3 hours starting troubles carry out firing up boosting before waste heat boiler shutdown, by auxiliary vapour header vapour source by reheating
Cold section of steam is changed to starting trouble offer；
(2) check that cold section of steam of reheating supplies turbine shaft seal vapour source, unlatching is cold hydrophobic for gland steam pipeline again, by pipeline
Temperature is warmed to the degree of superheat more than 50 DEG C in advance, and as standby shaft seal steam, preparation is put at any time；
(3) gas turbine, waste heat boiler, steam turbine, gen-set system are carried out before shutting down once to check comprehensively, note
Record defect；
(4) check and correction each steam water-level meter of boiler before shutting down, the measured deviation between remote water-level meter and local water level meter is not
More than 30mm, remote water-level meter otherwise should be proofreaded again；
(5) Combined Cycle Unit total load is down to below 350MW (i.e.：Two combustion engine loads are down to 100MW)；
(6) #1 gas turbines, #2 gas turbines, standby AC Lub oil pump, direct current thing belonging to #3 steam turbines are carried out respectively
Therefore oil pump, jacking(oil) pump firing test, confirm to start normal rear stoppage in transit；
(7) compressor emergency shutdown operation step sequence and generator off-the-line operation step sequence are write；
(8) steam turbine thermal stress remaining numerical value is recorded, combustion engine is released and coordinates control, combustion engine is kept by combustion engine load instruction
Steady load；
(9) two waste heat boilers are released into high pressure main steam and reheated steam desuperheating water automatically controls, adjust high pressure superheater
Device desuperheating water pitch and reheater desuperheating water pitch, each pitch aperture change 1%, control manually desuperheating water pitch aperture with by
Gradually reduce the temperature of main steam and the temperature of reheated steam；
Cooling pressurization requires：The temperature drop rate of main steam and reheated steam is less than 1 DEG C/min；Main steam and reheating are steamed
The pressure decrease speed of vapour is less than 0.1MPa/H, and pressure drop is less than 0.5MPa/ hours；The degree of superheat of main steam and again steam
For 100 DEG C；The temperature difference of main steam and reheated steam is not more than 15 DEG C；The temperature drop rate of steam turbine cylinder is less than 1 DEG C/min；
The DEH thermal stress criterion of steam turbine calculates remaining variation tendency and is not more than 1K/min；
(10) when main steam temperature declines 5 DEG C, stable operation 15 minutes and steam turbine heat-stress meter count value changes trend
It is further continued for cooling after stable, steam turbine high intermediate pressure cylinder and the swollen difference change of low pressure (LP) cylinder is monitored, when high intermediate pressure cylinder owning consumption reaches -1mm
When, low pressure (LP) cylinder owning consumption reaches -5mm, stops cooling；
(11) when the aperture of high-pressure superheater desuperheating water pitch reheated steam desuperheating water pitch is more than 70%, reduction is passed through
Combustion engine load, vapor (steam) temperature is reduced, steam turbine load is less than hydrophobic valve before 30MW unlatching steam turbine main inlet throttle-stop valves；
(12) repeat step (9)-(11), until combustion engine load is down to 70-80MW, combustion engine delivery temperature be down to 500 DEG C with
Under, about 4 hours；
(13) when main steam temperature is less than 500 DEG C, octadecylamine is initially added into, and the temperature of main steam is maintained
500℃；When the liquid level residue 1/3rd in the molten medicine-chest of the filming amine chemicals dosing plant of packaged type, 100kg is continuously added
Octadecylamine, liquid level decrease speed need to be met by then adding demineralized water to full liquid level, dosing speed, prevent nothing in molten medicine-chest
Medicament need to stop the situation of dosing pump, cause to extend administration timing of drug；After dosing starts, agitator continuous service in molten medicine-chest until
Maintenance is completed；
(14) after being initially added into octadecylamine, the point-to-point blowdown of steam water sampling, each blowing time of putting is 5 minutes；
(15) after being initially added into octadecylamine half an hour, start to be sampled carbonated drink, water sample includes：Condensate, 1# are low
Press stove water and 2# low pressure furnaces water, 1# low-pressure steams and 2# low-pressure steams, 1# medium pressure furnaces water and 2# medium pressure furnaces water, 1# middle pressure steams and
2# middle pressure steams, 1# pressure furnaces water and 2# pressure furnaces water, 1# high pressure superheated steams and 2# high pressure superheated steams, totally 13 water samples,
With the frequency of sample examination per hour once, the conductance of water sample, pH and octadecylamine content are chemically examined；
(16) it is confirmed whether to reach maintenance terminal according to the octadecylamine content of stove water, superheated steam；
(17) after octadecylamine adds, molten medicine-chest should be rinsed with demineralized water immediately, and continue to run with dosing pump 30min, be filled
Divide and rinse drug feeding pipeline；
(18) after the completion of dosing, molten medicine-chest is rinsed 1 hour, and dosing work is completed, and should be vented molten medicine-chest content demineralized water,
And to being cleared up in molten medicine-chest, noresidue in guard box；
(19) after the completion of maintaining, operate step sequence by compressor emergency shutdown and generator off-the-line operation step sequence performs operation, and according to
Drum 0.7MPa is with pressure to discharge water；
(20) after boiler discharges water completion 48 hours, two stoves are opened, it is suitable by 1# stoves are basic, normal, high, 2# stoves are basic, normal, high
Sequence, six drum manhole doors are opened, are checked one by one, and carry out hydrophobic test；
In this method implementation process, from September in 2013 18 days 22:45, after unit starts to reduce load, from condensation
The preposition pump strainer discharge door of water added shutdown protection solution (octadecylamine), to 19 days 1:02 blowing out adds；It is right after dosing
Drug feeding pipeline is entered water-filling and rinsed 30 minutes, and then, unit continued load down shutdown, to 19 days 8：When 00, unit blowing out, altogether
200 kilograms of protection of boiler during shutdown period agent (octadecylamine) is added, is 10% stoste.
Chemical analysis data and relevant parameter in dosing and cyclic process as shown in table 1- tables 3,
The step of method that the present embodiment is provided also includes assessing protection of boiler during shutdown period effect：
Hydrophobic test is observed：After shutdown, very first time progress hydrophobicity examination after high, medium and low voltage drum manhole door is opened
Test, and photograph to record；
Cupric sulphate dropping test：After shutdown, cupric sulphate dropping test is carried out to drum；
During blowing out, the frequency of maintenance effect inspection：After downtime January is exceeded, to high, medium and low voltage drum again
Hydrophobic test is carried out, checks that the frequency is set to 1 time/month；
Startup stage Steam-water Quality compares：After unit is again started up, the behaviour such as boiler flushing, steam turbine red switch, unit on-load
Make the stage, according to《Unit starting Steam-water Quality supervises form》It is outer that (as shown in table 4- tables 18) carries out normal supervision, increase to
Water, Lu Shui, the octadecylamine assay of superheated steam；According to the qualified speed of unit iron content and unit starting water quality before
Qualified speed is contrasted, and confirms whether block surfaces corrosion has declined during shutdown.
1# stove octadecylamines Post Maintenance Check record (corresponds to the low-pressure drum of 1# stoves, middle pressure vapour respectively as shown in Figure 1-Figure 3
Bag, HP steam drum).
1# stove low-pressure drum steam line of demarcation is obvious, smooth, and about 40mm depth ponding is arranged at bottom, and vapour side has a large amount of oxide skins to take off
Fall.Inner wall surface has brick-red floating rust, dabs removable, the aobvious Dark grey in surface after removal.Low-pressure drum water side, vapour side hydrophobicity
Result of the test is good, and water droplet is more than 60 seconds without diffusion, cupric sulphate dropping test time, and result of the test is outstanding.
Pressure drum steam line of demarcation is obvious, smooth in 1# stoves, and bottom has partial oxidation skin to come off without ponding, vapour side.Inwall
There is brick-red floating rust on surface, dabs removable, the aobvious Dark grey in surface after removal.Middle pressure drum water side, vapour side hydrophobic test knot
Fruit is good, and the cupric sulphate dropping test time is more than 40 seconds, and result of the test is outstanding.
1# stove HP steam drum steam line of demarcation is obvious, smooth, and bottom is without ponding, high-pressure feed water pipe east, west side closure plate bolt
Come off.Inner wall surface has brick-red floating rust, dabs removable, the aobvious Dark grey in surface after removal.Moisture separation device have come off,
The situation of deformation is present.HP steam drum water side, vapour side hydrophobic test result are good, and the cupric sulphate dropping test time is more than 60
Second, result of the test is outstanding.
2# stove octadecylamines Post Maintenance Check record (corresponds to the low-pressure drum of 2# stoves, middle pressure vapour respectively as Figure 4-Figure 6
Bag, HP steam drum).
2# stove low-pressure drum steam line of demarcation is obvious, smooth, and about 50mm deep ponding and debris is arranged at bottom, and vapour side has largely
Oxide skin comes off.Inner wall surface has brick-red floating rust, dabs removable, the aobvious Dark grey in surface after removal.Low-pressure drum water side, vapour
Side hydrophobic test result is good, and the cupric sulphate dropping test time is more than 60 seconds, and result of the test is outstanding.
Pressure drum steam line of demarcation is obvious, smooth in 2# stoves, and bottom has oxide skin to come off without ponding and debris, vapour side.It is interior
Wall surface has brick-red floating rust, dabs removable, the aobvious Dark grey in surface after removal.Middle pressure drum water side, hydrophobic test result
Well, the cupric sulphate dropping test time is more than 40 seconds, and result of the test is outstanding.
2# stove HP steam drum steam line of demarcation is obvious, smooth, and there is a small amount of debris bottom without ponding.Inner wall surface has brick red
The floating rust of color, dab removable, the aobvious Dark grey in surface after removal.Water separator filler pallet comes off, deformation is serious.It is high
Press drum hydrophobic test result good, the cupric sulphate dropping test time is more than 60 seconds, and result of the test is outstanding.
It is as follows with the data comparative result during the startup before unit：
Cold conditions：#1 stoves：On 18 points of June 16 day water rinse to 18 days 19 points it is qualified shared when 49 hours；On June 19 0. 30
Branch fire to 19 days 12: 40 it is qualified shared when 12.17 hours；Divide on October 5 0. 30 water rinse to 7 days 16 points it is qualified common
63.5 hours used times；Light a fire October 8 day 5: 20 to 8 days 16 points it is qualified shared when 10.66 hours；
#2 stoves：On 18 points of June 16 day water rinse to 19 days 15 points it is qualified shared when 69.3 hours；June 25 day 5: 20 branch
Fire to 25 days 14 points it is qualified shared when 8.7 hours；Divide on October 7 0. 30 water rinse to 8 days 17: 30 it is qualified shared when 31
Hour；Light a fire October 8 day 21: 50 to 9 days 7: 30 it is qualified shared when 9.7 hours；
It is hot：The #1 stoves hot machine that opens on the 14th opened machine on 13rd with #2 stoves, was fed water before starting under non-flushing state, stove water iron
Content is qualified, and after start-up and iron content is also qualified before vapour.
In view of the foregoing it is apparent that being maintained using octadecylamine waste heat boiler unit, good guarantor can be obtained
Support effect.
Claims (6)
1. a kind of blowing out anti-corrosion guard method of waste heat boiler unit, it comprises the following steps：
(1) 3 hours starting troubles carry out firing up boosting before waste heat boiler shutdown, by auxiliary vapour header vapour source by cold section of reheating
Steam is changed to starting trouble offer；
(2) check that cold section of steam of reheating supplies turbine shaft seal vapour source, unlatching is cold hydrophobic for gland steam pipeline again, by pipe temperature
The pre- degree of superheat that is warmed to is more than 50 DEG C, and as standby shaft seal steam, preparation is put at any time；
(3) gas turbine, waste heat boiler, steam turbine, gen-set system are checked comprehensively before shutting down；
(4) check and correction each steam water-level meter of boiler, the measured deviation between remote water-level meter and local water level meter are not more than before shutting down
30mm, remote water-level meter otherwise should be proofreaded again；
(5) Combined Cycle Unit total load is down to below 350MW；
(6) #1 gas turbines, #2 gas turbines, standby AC Lub oil pump, direct current accident oil belonging to #3 steam turbines are carried out respectively
Pump, jacking(oil) pump firing test, confirm to start normal rear stoppage in transit；
(7) compressor emergency shutdown operation step sequence and generator off-the-line operation step sequence are write；
(8) steam turbine thermal stress remaining numerical value is recorded, combustion engine is released and coordinates control, combustion engine load is kept by combustion engine load instruction
It is stable；
(9) two waste heat boilers are released into high pressure main steam and reheated steam desuperheating water automatically controls, adjustment high-pressure superheater subtracts
Warm water pitch and reheater desuperheating water pitch, each pitch aperture change 1%, control desuperheating water pitch aperture gradually to drop manually
The temperature of low main steam and the temperature of reheated steam；
(10) when main steam temperature declines 5 DEG C, stable operation 15 minutes and steam turbine heat-stress meter count value changes trend stability
After be further continued for cooling, monitor steam turbine high intermediate pressure cylinder and low pressure (LP) cylinder it is swollen difference change, it is low when high intermediate pressure cylinder owning consumption reaches -1mm
Cylinder pressure owning consumption reaches -5mm, stops cooling；
(11) when the aperture of high-pressure superheater desuperheating water pitch, reheated steam desuperheating water pitch is more than 70%, fired by reducing
Machine load, vapor (steam) temperature is reduced, steam turbine load is less than hydrophobic valve before 30MW unlatching steam turbine main inlet throttle-stop valves；
(12) repeat step (9)-(11), until combustion engine load is down to 70-80MW, combustion engine delivery temperature is down to less than 500 DEG C；
(13) when main steam temperature is less than 500 DEG C, octadecylamine is initially added into, and the temperature of main steam is maintained 500 DEG C；
(14) after being initially added into octadecylamine, the point-to-point blowdown of steam water sampling, each blowing time of putting is 5 minutes；
(15) after being initially added into octadecylamine half an hour, start to be sampled carbonated drink, water sample includes：Condensate, 1# low pressure furnaces
Press and steam in water, 2# low pressure furnaces water, 1# low-pressure steams, 2# low-pressure steams, 1# medium pressure furnaces water, 2# medium pressure furnaces water, 1# middle pressure steams, 2#
Vapour, 1# pressure furnaces water, 2# pressure furnaces water, 1# high pressure superheated steams, 2# high pressure superheated steams, totally 13 water samples, to take per hour
The frequency of sample chemical examination once, is chemically examined the conductance of water sample, pH and octadecylamine content；
(16) it is confirmed whether to reach maintenance terminal according to the octadecylamine content of stove water, superheated steam, the maintenance terminal refers to
The content of octadecylamine reaches 5-25mg/L；
(17) after octadecylamine adds, molten medicine-chest should be rinsed with demineralized water immediately, and continue to run with dosing pump 30min-60min,
Fully rinse drug feeding pipeline；
(18) after the completion of dosing, molten medicine-chest is rinsed 1 hour, and dosing work is completed, and should be vented molten medicine-chest content demineralized water, and right
Cleared up in molten medicine-chest, noresidue in guard box；
(19) after the completion of maintaining, operate step sequence by compressor emergency shutdown and generator off-the-line operation step sequence performs operation, and according to drum
0.7MPa is with pressure to discharge water；
(20) after boiler discharges water completion 48 hours, two stoves are opened, by the order that 1# stoves are basic, normal, high, 2# stoves are basic, normal, high,
Six drum manhole doors are opened, are checked one by one, and carry out hydrophobic test；
Wherein, in step (9), the cooling rate control of the main steam and reheated steam is less than 1 DEG C/min；The main steaming
The control of the pressure decrease speed of vapour and reheated steam is that the amount control that pressure declines is less than 0.5MPa/ less than 0.1MPa/ hours
Hour；The degree of superheat control of the main steam and reheated steam is more than 100 DEG C；The temperature difference control of the main steam and reheated steam
For no more than 15 DEG C；The Wen Duxiajiang speed controls of the steam turbine cylinder are less than 1 DEG C/min；The DEH heat of the steam turbine
It is no more than 1K/min that stress criterion, which calculates the control of remaining variation tendency,.
2. according to the method for claim 1, wherein, the octadecylamine is according to 1 with demineralized water：9 mass ratio mixing
Obtain being added after pharmaceutical mixture.
3. according to the method for claim 2, wherein, the pharmaceutical mixture be waste heat boiler unit condensate it is preposition
Added behind pump discharge main pipe regulating valve.
4. the method according to claim 11, wherein, the filming amine chemicals dosing plant that the pharmaceutical mixture passes through packaged type
It is added.
5. the method according to claim 11, wherein, the filming amine chemicals dosing plant that the pharmaceutical mixture passes through packaged type
It is added.
6. according to the method described in claim any one of 2-5, wherein, the pharmaceutical mixture enters again after being heated to 40 DEG C
Row addition.
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| CN108644016B (en) * | 2018-03-26 | 2019-08-16 | 杭州意能电力技术有限公司 | Gas-steam combined cycle set therrmodynamic system stops spare corrosion protection technique |
| 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 |
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| CN1415929A (en) * | 2002-10-28 | 2003-05-07 | 王文兵 | Implementing method and device for protecting unused boilers by using fatty amine |
| CN102288064A (en) * | 2011-06-17 | 2011-12-21 | 河北省电力建设调整试验所 | Protection method for joint stop of air cooling island and unit |
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| CN102288064A (en) * | 2011-06-17 | 2011-12-21 | 河北省电力建设调整试验所 | Protection method for joint stop of air cooling island and unit |
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