CN105220136A - A kind of blowing out rust protection guard method of waste heat boiler unit - Google Patents
A kind of blowing out rust protection guard method of waste heat boiler unit Download PDFInfo
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Abstract
The invention provides a kind of blowing out rust protection guard method of waste heat boiler unit.The method is the blowing out rust protection protection realizing waste heat boiler unit by adding octadecylamine in furnace stopping maintenance process in waste heat boiler unit.Method provided by the present invention is in waste heat boiler unit shutdown at sliding parameters process; when boiler pressure, temperature are down to conditions suitable; filming amine is added to therrmodynamic system; form one deck unit molecule or polymolecular hydrophobic protective membrane at heat power equipment internal surface, thus reach the object stoping metallic corrosion.
Description
Technical field
The present invention relates to the blowing out rust protection guard method of waste heat boiler unit, belong to waste heat boiler maintenance technical field.
Background technology
From the investigation situation of the boiler maintenance of nationwide content, though the method for boiler rust protection has special directive/guide, for vertical exhaust-heat boiler, design form is novel, and mature experience is few, and the solution of the laying-up problem of this type of furnace is also immature.Be subject to type of furnace design limit, boiler is with pressure discharge water after easy ponding and cannot drying, the maintenance requirement of conventional dry maintenance mode cannot be met.And general wet method maintenance mode cannot meet shutdown maintenance demand.
Therefore, the front maintenance of the maintenance of vertical heater becomes the new problem that this area faces.
Summary of the invention
For solving the problems of the technologies described above, the object of the present invention is to provide a kind of blowing out rust protection guard method of waste heat boiler unit, by adding octadecylamine in furnace stopping maintenance process in waste heat boiler unit, the rust protection realized for waste heat boiler unit is protected.
For achieving the above object, the invention provides a kind of blowing out rust protection guard method of waste heat boiler unit, it comprises the following steps:
(1) shut down first 3 hours starting trouble at waste heat boiler and carry out firing up boosting, auxiliary vapour header vapour source is changed to starting trouble by reheating cold section of steam to be provided;
(2) check that reheating cold section of steam is for turbine shaft seal vapour source, open cold supplies gland sealing steam pipeline hydrophobic again, pipe temperature is warmed in advance superheating temperature and is greater than 50 DEG C, as immobilized spindle gland sealing steam supply, prepares to drop at any time;
(3) before shutting down, internal combustion turbine, waste heat boiler, steam turbine, gen-set system are checked comprehensively;
(4) each steam water-level meter of check and correction boiler before shutting down, the measured deviation between remote water-level meter and local water level meter is not more than 30mm, otherwise should again proofread remote water-level meter;
(5) Combined Cycle Unit total load is down to below 350MW;
(6) carry out AC Lub oil pump for subsequent use, direct current emergency bearing oil pump, jacking(oil) pump starting characteristics test belonging to #1 internal combustion turbine, #2 internal combustion turbine, #3 steam turbine respectively, confirm to start normal rear stoppage in transit;
(7) compressor emergency shutdown operation step sequence and generator off-the-line operation step sequence is write;
(8) record steam turbine thermal stresses remaining numerical value, remove combustion engine cooperation control, keep combustion engine steady load by combustion engine load instruction;
(9) two waste heat boilers releasing high pressure main steams and reheated steam desuperheating water are controlled automatically, adjustment high-pressure superheater desuperheating water pitch and reheater desuperheating water pitch, each pitch aperture change 1%, Non-follow control desuperheating water pitch aperture is with the temperature of the temperature and reheated steam that reduce main steam gradually;
(10) when main steam temperature declines 5 DEG C, cooling is continued again after steady running 15 minutes and steam turbine thermal stresses evaluation variation tendency are stable, monitor steam turbine high intermediate pressure cylinder and the swollen difference change of low pressure (LP) cylinder, when high intermediate pressure cylinder owning consumption reaches-1mm, 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 greater than 70%, by reducing combustion engine load, reduce vapor temperature, steam turbine load is lower than hydrophobic valve before 30MW unlatching steam turbine main inlet throttle-stop valve;
(12) repeating step (9)-(11), until combustion engine load is down to 70-80MW, combustion engine exhaust temperature is down to less than 500 DEG C;
(13) when main steam temperature is lower than 500 DEG C, start to add octadecylamine, and the temperature of main steam is maintained 500 DEG C;
(14) after starting to add octadecylamine, the point-to-point blowdown of steam water sampling, each some blowing time is 5 minutes;
(15) after starting to add octadecylamine half an hour, start to sample carbonated drink, water sample comprises: condensed water, 1# low pressure furnace water and 2# low pressure furnace water, 1# low-pressure steam and 2# low-pressure steam, 1# medium pressure furnace water and 2# medium pressure furnace water, 1# middle pressure steam and 2# middle pressure steam, 1# pressure furnace water and 2# pressure furnace water, 1# high pressure superheated steam and 2# high pressure superheated steam, totally 13 water samples, with the sample examination per hour frequency once, the conductance of water sample, pH and octadecylamine content are chemically examined;
(16) be confirmed whether to reach maintenance terminal according to the octadecylamine content of stove water, superheated vapour;
(17), after octadecylamine adds, molten medicine-chest should rinse with de-mineralized water immediately, and continues to run dosing pump 30min-60min, fully rinses drug feeding pipeline;
(18) after dosing completes, molten medicine-chest rinses 1 hour, and dosing work completes, and by the emptying of molten medicine-chest content de-mineralized water, and should clear up in molten medicine-chest, noresidue in guard box;
(19), after having maintained, by compressor emergency shutdown operation step sequence and generator off-the-line operation step sequence executable operations, and discharge water according to drum 0.7MPa is with pressure;
(20) after boiler has discharged water 48 hours, open two stoves, by the basic, normal, high order of basic, normal, high, the 2# stove of 1# stove, open six drum manhole doors, check one by one, and carry out hydrophobic test.
In the above-mentioned methods, preferably, described octadecylamine be mixed to get pharmaceutical mixture with de-mineralized water according to the mass ratio of 1:9 after add.
In the above-mentioned methods, preferably, described pharmaceutical mixture exports adding of female pipe variable valve below at the condensed water fore pump of waste heat boiler unit.Namely in the above-mentioned methods, chemical feeding points is: after condensed water fore pump exports female pipe variable valve, before dosing, should manual service valve bottom emptying gallery place in front of the door, confirms that former pipeline section wash water valve is without drainage.
In the above-mentioned methods, preferably, described pharmaceutical mixture is added by portable filming amine chemicals dosing plant, and this portable filming amine chemicals dosing plant is the conventional equipment of this area, such as portable protection of boiler during shutdown period chemicals dosing plant.When adding medicament, this device should be connected power supply, water source, and but guaranteeing that connected power supply is in standard state, guaranteeing that the moisturizing of #3 generator stator cooling water discharges water manual valve can normal running.
In the above-mentioned methods, preferably, described pharmaceutical mixture is heated to 40 DEG C add afterwards again.In implementation process, octadecylamine can be added in chemicals dosing plant and carry out dissolving (such as 100 kilograms of octadecylamines join 900 kilograms of de-mineralized waters, totally 1 ton) and being heated to 40 DEG C, then carry out dosing operation on suitable opportunity.
In the above-mentioned methods, preferably, in step (9), the cooling rate of described main steam and reheated steam controls as being less than 1 DEG C/min; The pressure drop speed control of described main steam and reheated steam is for being less than 0.1MPa/ hour, and the amount of pressure drop controls as being less than 0.5MPa/ hour; The superheating temperature of described main steam and reheated steam controls to be greater than 100 DEG C; The temperature difference of described main steam and reheated steam controls as being not more than 15 DEG C; The temperature lowering speed of described steam turbine cylinder controls as being less than 1 DEG C/min; The DEH thermal stresses criterion of described steam turbine calculates remaining variation tendency and controls as being not more than 1K/min.
In the above-mentioned methods, before medicament does not add or do not circulate time enough, can not shut down.
The maintenance margin of aforesaid method provided by the present invention can comprise waste heat boiler unit with lower part:
Condenser → condensed water fore pump → condensate pump → low-pressure coal saver → low (middle and high) pressure drum → low (middle and high) pressure vaporizer → 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 closes instrument water intaking valve; Steam water sampling frame senior middle school low pressure feed water, senior middle school's low pressure furnace water, condensed water, high, medium and low voltage superheated vapour, reheated steam stopple coupon are unobstructed, condensed water deironing filter off-the-line, bypass door standard-sized sheet; Close drum platoon, determine valve, close low-pressure drum deoxygenation door, to reduce medicine waste, strengthen monitoring each liquid level of steam drum (± 50mm) in normal range simultaneously; According to in-line meter Con trolling index, confirm feedwater, the operation of stove water pH value high limit about 9.8.
According to specific embodiment of the invention scheme, preferably, the blowing out rust protection guard method of above-mentioned waste heat boiler unit also comprises the step assessed protection of boiler during shutdown period effect:
Hydrophobic test is observed: after shutdown, after opening high, medium and low voltage drum manhole door, the very first time carries out hydrophobic test, and Taking Pictures recording;
Cupric sulphate dropping test: after shutdown, carries out cupric sulphate dropping test and hydrophobic test, and Taking Pictures recording;
Furnace shutdown period, the frequency that maintenance effect checks: after exceeding January, again carry out hydrophobic test to high, medium and low voltage drum, checks that the frequency is decided to be 1 time/month stop time;
Unloading phase Steam-water Quality compare: after unit starts again, the operational phases such as boiler flushing, steam turbine red switch, unit on-load, outside supervising normally according to " unit starting Steam-water Quality supervision form ", increase the octadecylamine assay of feedwater, stove water, superheated vapour; Contrast according to the qualified speed of unit iron level and the qualified speed of unit starting water quality before, confirm whether block surfaces corrosion declines to some extent between down period.Illustrate that maintenance effect is good if declined, can think and complete maintenance, illustrate that the effect of this maintenance is bad if do not declined.
In the above-mentioned methods, in the process of adding medicine, if occur, pH declines to a great extent, ammoniacal liquor volume pump should be started immediately, in 1# phosphoric acid salt batch meter, add sodium hydroxide (such as 500g) simultaneously, and start phosphoric acid salt volume pump to the dosing of middle high-pressure drum, to improving rapidly stove water pH value.
When Unit Steam Water circulates more than 4 hours or the content of octadecylamine reaches 5-25mg/L, can think and can stop adding medicine by the terminal having reached maintenance.
Method provided by the present invention is in waste heat boiler unit shutdown at sliding parameters process; when boiler pressure, temperature are down to conditions suitable; filming amine is added to therrmodynamic system; form one deck unit molecule or polymolecular hydrophobic protective membrane at heat power equipment internal surface, thus reach the object stoping metallic corrosion.
The present invention adopts the guard method of octadecylamine film forming, is optimized, obtains the maintenance procedure of the maintenance demand being suitable for vertical Natural Circulation HRSG, have following significance from aspects such as chemical feeding points, unit steam load, administration timing of drug, vapor temperatures:
1, novel vertical Waste Heat Boiler Design problem is overcome, reach maintenance effect, after octadecylamine having been maintained from reality maintenance result, whether ponding directly affects maintenance effect judges, combing is carried out to the different viewpoints that each scientific research institutions hold in the industry at present, has positive effect to the maturation of the maintenance procedure of this type of furnace.
2, for vertical boilers, control vapor temperature, chemical feeding points when octadecylamine maintains, ensure that three pressure boiler protection liquid mix as early as possible, reduce protection liquid mixing time, saving medicament expense use, reduces the financial loss of furnace shutdown period underrun; By maintenance and subsequent examination, successive optimization maintenance correlation parameter, final formulation is applicable to most economical, the effective octadecylamine maintenance procedure of novel vertical waste heat boiler.
3, reduce the flush time that unit starts again, can deposition be reduced simultaneously, reduce quantity of wastewater effluent, reach the object of economic benefit and social benefit doulbe-sides' victory.
4, unit starting initial stage no matter combustion efficacy, or the negative impact of blow down amount to environmental protection is maximum, and combustion engine grid-connected after, if reduce Boiler Steam quality qualified time by the octadecylamine maintenance after optimizing, steam turbine is red switch as scheduled, reaching denitrating system to put into operation condition SCR inlet flue gas temperature utmost dispatch, ensure that smoke NOx content is up to standard as early as possible, environmental protection social benefit can be increased further for being in enterprise of Pekinese.
Accompanying drawing explanation
Fig. 1-Fig. 3 is the record of search of 1# stove after octadecylamine maintenance;
Fig. 4-Fig. 6 is the record of search of 2# stove after octadecylamine maintenance.
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and beneficial effect, existing following detailed description is carried out to technical scheme of the present invention, but can not be interpreted as to of the present invention can the restriction of practical range.
Embodiment
Present embodiments provide a kind of blowing out rust protection guard method of waste heat boiler unit, it comprises the following steps:
(1) shut down first 3 hours starting trouble at waste heat boiler and carry out firing up boosting, auxiliary vapour header vapour source is changed to starting trouble by reheating cold section of steam to be provided;
(2) check that reheating cold section of steam is for turbine shaft seal vapour source, open cold supplies gland sealing steam pipeline hydrophobic again, pipe temperature is warmed in advance superheating temperature and is greater than 50 DEG C, as immobilized spindle gland sealing steam supply, prepares to drop at any time;
(3) before shutting down, internal combustion turbine, waste heat boiler, steam turbine, gen-set system are once checked comprehensively, recording defect;
(4) each steam water-level meter of check and correction boiler before shutting down, the measured deviation between remote water-level meter and local water level meter is not more than 30mm, otherwise should again proofread remote water-level meter;
(5) Combined Cycle Unit total load is down to below 350MW (that is: two combustion engine loads are down to 100MW);
(6) carry out AC Lub oil pump for subsequent use, direct current emergency bearing oil pump, jacking(oil) pump starting characteristics test belonging to #1 internal combustion turbine, #2 internal combustion turbine, #3 steam turbine respectively, confirm to start normal rear stoppage in transit;
(7) compressor emergency shutdown operation step sequence and generator off-the-line operation step sequence is write;
(8) record steam turbine thermal stresses remaining numerical value, remove combustion engine cooperation control, keep combustion engine steady load by combustion engine load instruction;
(9) two waste heat boilers releasing high pressure main steams and reheated steam desuperheating water are controlled automatically, adjustment high-pressure superheater desuperheating water pitch and reheater desuperheating water pitch, each pitch aperture change 1%, Non-follow control desuperheating water pitch aperture is with the temperature of the temperature and reheated steam that reduce main steam gradually;
Cooling adds pressure request: the temperature lowering speed of main steam and reheated steam is less than 1 DEG C/min; The pressure drop speed of main steam and reheated steam is less than 0.1MPa/H, and pressure drop is less than 0.5MPa/ hour; The superheating temperature of main steam and again steam is 100 DEG C; The temperature difference of main steam and reheated steam is not more than 15 DEG C; The temperature lowering speed of steam turbine cylinder is less than 1 DEG C/min; The DEH thermal stresses criterion of steam turbine calculates remaining variation tendency and is not more than 1K/min;
(10) when main steam temperature declines 5 DEG C, cooling is continued again after steady running 15 minutes and steam turbine thermal stresses evaluation variation tendency are stable, monitor steam turbine high intermediate pressure cylinder and the swollen difference change of low pressure (LP) cylinder, when high intermediate pressure cylinder owning consumption reaches-1mm, 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 greater than 70%, by reducing combustion engine load, reduce vapor temperature, steam turbine load is lower than hydrophobic valve before 30MW unlatching steam turbine main inlet throttle-stop valve;
(12) repeating step (9)-(11), until combustion engine load is down to 70-80MW, combustion engine exhaust temperature is down to less than 500 DEG C, about 4 hours;
(13) when main steam temperature is lower than 500 DEG C, start to add octadecylamine, and the temperature of main steam is maintained 500 DEG C; In the molten medicine-chest of portable filming amine chemicals dosing plant liquid level residue three/for the moment, continue to add 100kg octadecylamine, then de-mineralized water is added to expiring liquid level, dosing speed need meet liquid level lowering speed, prevent the situation need stopping dosing pump in molten medicine-chest without medicament, cause extending administration timing of drug; After dosing starts, the agitator continuous service in molten medicine-chest is until maintained;
(14) after starting to add octadecylamine, the point-to-point blowdown of steam water sampling, each some blowing time is 5 minutes;
(15) after starting to add octadecylamine half an hour, start to sample carbonated drink, water sample comprises: condensed water, 1# low pressure furnace water and 2# low pressure furnace water, 1# low-pressure steam and 2# low-pressure steam, 1# medium pressure furnace water and 2# medium pressure furnace water, 1# middle pressure steam and 2# middle pressure steam, 1# pressure furnace water and 2# pressure furnace water, 1# high pressure superheated steam and 2# high pressure superheated steam, totally 13 water samples, with the sample examination per hour frequency once, the conductance of water sample, pH and octadecylamine content are chemically examined;
(16) be confirmed whether to reach maintenance terminal according to the octadecylamine content of stove water, superheated vapour;
(17), after octadecylamine adds, molten medicine-chest should rinse with de-mineralized water immediately, and continues to run dosing pump 30min, fully rinses drug feeding pipeline;
(18) after dosing completes, molten medicine-chest rinses 1 hour, and dosing work completes, and by the emptying of molten medicine-chest content de-mineralized water, and should clear up in molten medicine-chest, noresidue in guard box;
(19), after having maintained, by compressor emergency shutdown operation step sequence and generator off-the-line operation step sequence executable operations, and discharge water according to drum 0.7MPa is with pressure;
(20) after boiler has discharged water 48 hours, open two stoves, the order basic, normal, high by 1# stove, 2# stove is basic, normal, high, open six drum manhole doors, check one by one, and carry out hydrophobic test;
In the method implementation process, from September 18th, 2013 22:45, after unit starts to reduce load, add shutdown protection solution (octadecylamine) from condensed water fore pump strainer discharge door, add to 1:02 blowing out on the 19th; After dosing, carry out water rinse 30 minutes to drug feeding pipeline, then, unit proceeds load down and shuts down, and during to 8:00 on the 19th, unit blowing out, adds protection of boiler during shutdown period agent (octadecylamine) 200 kilograms altogether, is the stoste of 10%.
Chemical analysis data in dosing and working cycle and correlation parameter as shown in table 1-table 3,
The method that the present embodiment provides also comprises the step assessed protection of boiler during shutdown period effect:
Hydrophobic test is observed: after shutdown, after opening high, medium and low voltage drum manhole door, the very first time carries out hydrophobic test, and Taking Pictures recording;
Cupric sulphate dropping test: after shutdown, carries out cupric sulphate dropping test to drum;
Furnace shutdown period, the frequency that maintenance effect checks: after exceeding January, again carry out hydrophobic test to high, medium and low voltage drum, checks that the frequency is decided to be 1 time/month stop time;
Unloading phase Steam-water Quality compare: after unit starts again, the operational phases such as boiler flushing, steam turbine red switch, unit on-load, outside supervising normally according to " unit starting Steam-water Quality supervision form " (as shown in table 4-table 18), increase the octadecylamine assay of feedwater, stove water, superheated vapour; Contrast according to the qualified speed of unit iron level and the qualified speed of unit starting water quality before, confirm whether block surfaces corrosion declines to some extent between down period.
1# stove octadecylamine Post Maintenance Check record is (respectively low-pressure drum, middle pressure drum, the HP steam drum of corresponding 1# stove) as shown in Figure 1-Figure 3.
1# stove low-pressure drum steam line of delimitation is obvious, smooth, and have an appointment the dark ponding of 40mm in bottom, vapour side has a large amount of oxide skin to come off.Inner wall surface has brick-red floating rust, dabs and can remove, and removes rear surface and shows Dark grey.Well, water droplet is without diffusion, and the cupric sulphate dropping test time is greater than 60 seconds, and test-results is outstanding for low-pressure drum water side, vapour side hydrophobic test result.
Press drum steam line of delimitation obvious, smooth in 1# stove, bottom is without ponding, and vapour side has partial oxidation skin to come off.Inner wall surface has brick-red floating rust, dabs and can remove, and removes rear surface and shows Dark grey.Well, the cupric sulphate dropping test time is greater than 40 seconds, and test-results is outstanding for middle pressure drum water side, vapour side hydrophobic test result.
1# stove HP steam drum steam line of delimitation is obvious, smooth, and bottom is without ponding, and high-pressure feed water pipe east, west side closure plate bolt all come off.Inner wall surface has brick-red floating rust, dabs and can remove, and removes rear surface and shows Dark grey.Moisture separation device has the situation existence coming off, be out of shape.Well, the cupric sulphate dropping test time is greater than 60 seconds, and test-results is outstanding for HP steam drum water side, vapour side hydrophobic test result.
2# stove octadecylamine Post Maintenance Check record is (respectively low-pressure drum, middle pressure drum, the HP steam drum of corresponding 2# stove) as Figure 4-Figure 6.
2# stove low-pressure drum steam line of delimitation is obvious, smooth, and have an appointment the dark ponding of 50mm and foreign material in bottom, vapour side has a large amount of oxide skin to come off.Inner wall surface has brick-red floating rust, dabs and can remove, and removes rear surface and shows Dark grey.Well, the cupric sulphate dropping test time is greater than 60 seconds, and test-results is outstanding for low-pressure drum water side, vapour side hydrophobic test result.
Press drum steam line of delimitation obvious, smooth in 2# stove, bottom is without ponding and foreign material, and vapour side has oxide skin to come off.Inner wall surface has brick-red floating rust, dabs and can remove, and removes rear surface and shows Dark grey.Well, the cupric sulphate dropping test time is greater than 40 seconds, and test-results is outstanding for middle pressure drum water side, hydrophobic test result.
2# stove HP steam drum steam line of delimitation is obvious, smooth, and, without ponding, there are a small amount of foreign material bottom.Inner wall surface has brick-red floating rust, dabs and can remove, and removes rear surface and shows Dark grey.Water separator filler pallet comes off, deformation is serious.HP steam drum hydrophobic test result is good, and the cupric sulphate dropping test time is greater than 60 seconds, and test-results is outstanding.
And the data comparative result between the starting period before unit is as follows:
Cold conditions: #1 stove: June 16 18 upper water rinse to 18 days 19 qualified shared time 49 hours; June 19 0. 30 points igniting to 19 days 12: 40 qualified shared time 12.17 hours; October 5 0. 30 points upper water rinse to 7 days 16 qualified shared time 63.5 hours; On October 85: 20 igniting to 8 days 16 qualified shared time 10.66 hours;
#2 stove: June 16 18 upper water rinse to 19 days 15 qualified shared time 69.3 hours; 5: 20 on the 25th June igniting to 25 days 14 qualified shared time 8.7 hours; October 7 0. 30 points upper water rinse to 8 days 17: 30 qualified shared time 31 hours; On October 8 21: 50 igniting to 9 days 7: 30 qualified shared time 9.7 hours;
Hot: #1 stove 14 days is hot opens machine and #2 stove opened machine on 13rd, feed water under non-flushing state before starting, stove water iron level is all qualified, iron level is also all qualified after start-up and before vapour.
In sum, can find out and adopt octadecylamine to maintain waste heat boiler unit, good maintenance effect can be obtained.
Claims (6)
1. a blowing out rust protection guard method for waste heat boiler unit, it comprises the following steps:
(1) shut down first 3 hours starting trouble at waste heat boiler and carry out firing up boosting, auxiliary vapour header vapour source is changed to starting trouble by reheating cold section of steam to be provided;
(2) check that reheating cold section of steam is for turbine shaft seal vapour source, open cold supplies gland sealing steam pipeline hydrophobic again, pipe temperature is warmed in advance superheating temperature and is greater than 50 DEG C, as immobilized spindle gland sealing steam supply, prepares to drop at any time;
(3) before shutting down, internal combustion turbine, waste heat boiler, steam turbine, gen-set system are checked comprehensively;
(4) each steam water-level meter of check and correction boiler before shutting down, the measured deviation between remote water-level meter and local water level meter is not more than 30mm, otherwise should again proofread remote water-level meter;
(5) Combined Cycle Unit total load is down to below 350MW;
(6) carry out AC Lub oil pump for subsequent use, direct current emergency bearing oil pump, jacking(oil) pump starting characteristics test belonging to #1 internal combustion turbine, #2 internal combustion turbine, #3 steam turbine respectively, confirm to start normal rear stoppage in transit;
(7) compressor emergency shutdown operation step sequence and generator off-the-line operation step sequence is write;
(8) record steam turbine thermal stresses remaining numerical value, remove combustion engine cooperation control, keep combustion engine steady load by combustion engine load instruction;
(9) two waste heat boilers releasing high pressure main steams and reheated steam desuperheating water are controlled automatically, adjustment high-pressure superheater desuperheating water pitch and reheater desuperheating water pitch, each pitch aperture change 1%, Non-follow control desuperheating water pitch aperture is with the temperature of the temperature and reheated steam that reduce main steam gradually;
(10) when main steam temperature declines 5 DEG C, cooling is continued again after steady running 15 minutes and steam turbine thermal stresses evaluation variation tendency are stable, monitor steam turbine high intermediate pressure cylinder and the swollen difference change of low pressure (LP) cylinder, when high intermediate pressure cylinder owning consumption reaches-1mm, 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 greater than 70%, by reducing combustion engine load, reduce vapor temperature, steam turbine load is lower than hydrophobic valve before 30MW unlatching steam turbine main inlet throttle-stop valve;
(12) repeating step (9)-(11), until combustion engine load is down to 70-80MW, combustion engine exhaust temperature is down to less than 500 DEG C;
(13) when main steam temperature is lower than 500 DEG C, start to add octadecylamine, and the temperature of main steam is maintained 500 DEG C;
(14) after starting to add octadecylamine, the point-to-point blowdown of steam water sampling, each some blowing time is 5 minutes;
(15) after starting to add octadecylamine half an hour, start to sample carbonated drink, water sample comprises: condensed water, 1# low pressure furnace water, 2# low pressure furnace water, 1# low-pressure steam, 2# low-pressure steam, 1# medium pressure furnace water, 2# medium pressure furnace water, 1# middle pressure steam, 2# middle pressure steam, 1# pressure furnace water, 2# pressure furnace water, 1# high pressure superheated steam, 2# high pressure superheated steam, totally 13 water samples, with the sample examination per hour frequency once, the conductance of water sample, pH and octadecylamine content are chemically examined;
(16) be confirmed whether to reach maintenance terminal according to the octadecylamine content of stove water, superheated vapour, described maintenance terminal refers to that the content of octadecylamine reaches 5-25mg/L;
(17), after octadecylamine adds, molten medicine-chest should rinse with de-mineralized water immediately, and continues to run dosing pump 30min-60min, fully rinses drug feeding pipeline;
(18) after dosing completes, molten medicine-chest rinses 1 hour, and dosing work completes, and by the emptying of molten medicine-chest content de-mineralized water, and should clear up in molten medicine-chest, noresidue in guard box;
(19), after having maintained, by compressor emergency shutdown operation step sequence and generator off-the-line operation step sequence executable operations, and discharge water according to drum 0.7MPa is with pressure;
(20) after boiler has discharged water 48 hours, open two stoves, the order basic, normal, high by 1# stove, 2# stove is basic, normal, high, open six drum manhole doors, check one by one, and carry out hydrophobic test.
2. method according to claim 1, wherein, described octadecylamine be mixed to get pharmaceutical mixture with de-mineralized water according to the mass ratio of 1:9 after add.
3. method according to claim 2, wherein, described pharmaceutical mixture exports adding of female pipe variable valve below at the condensed water fore pump of waste heat boiler unit.
4. the method according to any one of claim 1-3, wherein, described pharmaceutical mixture is added by portable filming amine chemicals dosing plant.
5. the method according to any one of claim 1-4, wherein, described pharmaceutical mixture is heated to 40 DEG C add afterwards again.
6. method according to claim 1, wherein, in step (9), the cooling rate of described main steam and reheated steam controls as being less than 1 DEG C/min; The pressure drop speed control of described main steam and reheated steam is for being less than 0.1MPa/ hour, and the amount of pressure drop controls as being less than 0.5MPa/ hour; The superheating temperature of described main steam and reheated steam controls to be greater than 100 DEG C; The temperature difference of described main steam and reheated steam controls as being not more than 15 DEG C; The temperature lowering speed of described steam turbine cylinder controls as being less than 1 DEG C/min; The DEH thermal stresses criterion of described steam turbine calculates remaining variation tendency and controls as being not more than 1K/min.
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|---|---|---|---|---|
| CN108217987A (en) * | 2018-01-08 | 2018-06-29 | 中国恩菲工程技术有限公司 | Waste heat boiler dosing blowdown control method |
| CN108644016A (en) * | 2018-03-26 | 2018-10-12 | 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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| CN108217987A (en) * | 2018-01-08 | 2018-06-29 | 中国恩菲工程技术有限公司 | Waste heat boiler dosing blowdown control method |
| CN108644016A (en) * | 2018-03-26 | 2018-10-12 | 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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| CN105220136B (en) | 2018-02-09 |
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