CN109539234A - A kind of Boiler Steam reduction treatment system and method - Google Patents
A kind of Boiler Steam reduction treatment system and method Download PDFInfo
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- CN109539234A CN109539234A CN201811647355.4A CN201811647355A CN109539234A CN 109539234 A CN109539234 A CN 109539234A CN 201811647355 A CN201811647355 A CN 201811647355A CN 109539234 A CN109539234 A CN 109539234A
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- 238000000034 method Methods 0.000 title abstract description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 99
- 239000001301 oxygen Substances 0.000 claims abstract description 99
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 99
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 74
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 39
- 239000007921 spray Substances 0.000 claims abstract description 18
- 150000004985 diamines Chemical class 0.000 claims description 26
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 23
- 239000001257 hydrogen Substances 0.000 claims description 23
- 229910052739 hydrogen Inorganic materials 0.000 claims description 23
- 206010021143 Hypoxia Diseases 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 238000003672 processing method Methods 0.000 claims description 7
- 208000018875 hypoxemia Diseases 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000011218 segmentation Effects 0.000 claims description 4
- 238000005485 electric heating Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000000243 solution Substances 0.000 description 37
- 238000006213 oxygenation reaction Methods 0.000 description 11
- 239000007864 aqueous solution Substances 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000004176 ammonification Methods 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008676 import Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- OAKJQQAXSVQMHS-UHFFFAOYSA-N hydrazine group Chemical group NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000006392 deoxygenation reaction Methods 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000007954 hypoxia Effects 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- QVGXLLKOCUKJST-NJFSPNSNSA-N oxygen-18 atom Chemical compound [18O] QVGXLLKOCUKJST-NJFSPNSNSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000001698 pyrogenic effect Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention relates to boiler water chemistry process field, specially a kind of Boiler Steam reduction treatment system and method carry out the programmable controller of PID control including dosing pipe and to dosing pipe；The dosing pipe include in following three pipelines at least all the way, steam main pipe between connection economizer influent header and main vapour header is used to be added the superheater reduction treatment dosing pipe of reducing agent solution, cold jet chimney again is connected for the reheater reduction treatment dosing pipe of reducing agent solution to be added, connects the water pipeline of superheater and reheater for the spray desuperheating reduction treatment dosing pipe of reducing agent solution to be added；The input terminal of the programmable controller is corresponding to be connected into main steam dissolved oxygen concentration signal, dissolved oxygen concentration signal in reheated steam dissolved oxygen concentration signal and/or desuperheating water.The configuration of the present invention is simple, rationally, adjustment is convenient and fast for design, can adjust the accurate dissolved oxygen concentration adjusted in steam in time.
Description
Technical field
The present invention relates to boiler water chemistry process field, specially a kind of Boiler Steam reduction treatment system and method.
Background technique
Thermal power plant's superheater and reheater steam oxidation performance resistant to high temperatures, are the key that be related to unit safety economical operation
One of index.For a long time, super (super-) critical unit either uses oxidisability to volatilize full handling technology of water supply (abbreviation AVT
(O)) unit of oxygenated treatment technique (abbreviation OT) is still used, superheater and reheater are acted on by pyrogenic steam oxidation, sent out
Raw peroxidating skin falls off caused accident.Superheater caused by spalling of oxide layer and reheater elbow blockage problem frequently occur,
The accidents such as the overtemperature tube burst caused by, solid particle erosion (abbreviation SPE) have seriously affected the safety, reliable of unit operation
Property and economy.
Most domestic unit generallys use AVT (O) or the oxygenated treatment technique using low concentration at present.It is existing to add
The unit of oxygen processing, flows accelerated corrosion in order to prevent, under the premise of having enough concentration oxygen in guaranteeing liquid phase water, using indirect
The method of oxygenation reduces the dissolved oxygen in water supply, and dissolved oxygen in steam is made to be in anaerobic or hypoxemia target.Oxygenation technique is by original
The oxygen that adds high pressure, gradually develop into plus the side such as heavy-oxygen-enriched water (including using oxygen configuration mode and make-up water etc.) or air
Formula；Oxygenation regulative mode also by with single dissolved oxygen concentration be input ratio, integral, differential control (abbreviation PID control),
Develop into feedwater flow feedforward+dissolved oxygen concentration feedback PID to adjust.But for the main steam and superheated steam of steam circulation side
For, the above-mentioned oxygenation control system that water circulation side is arranged in substantially is a large time-delay system, determines that it controls precision
The latent defect of difference, and in direct-contact desuperheater desuperheat oxygen in water it is higher due to, not can control overheat/again
Oxygen concentration in hot steam is to ideal anaerobic or hypoxia (≤3 μ g/L).
It is therefore desirable to postpone to bring dissolved oxygen into control characteristic and desuperheating water greatly for existing for existing oxygenation technology
Problem proposes new treatment process, makes up the defect of existing oxygenation technique.
Summary of the invention
Aiming at the problems existing in the prior art, the present invention provides a kind of Boiler Steam reduction treatment system and method, knot
Structure is simple, and rationally, adjustment is convenient and fast for design, can adjust the accurate dissolved oxygen concentration adjusted in steam in time.
The present invention is to be achieved through the following technical solutions:
A kind of Boiler Steam reduction treatment system may be programmed including dosing pipe and to dosing pipe progress PID control
Controller；
The dosing pipe include in following three pipelines at least all the way,
Steam main pipe between connection economizer influent header and main vapour header is used to be added the superheater of reducing agent solution
Reduction treatment dosing pipe,
The reheater reduction treatment dosing pipe that cold jet chimney again is used to be added reducing agent solution is connected,
The water pipeline of connection superheater and reheater is used to be added the spray desuperheating reduction treatment dosing of reducing agent solution
Pipeline；
It is dense that the input terminal correspondence of the programmable controller is connected into main steam dissolved oxygen concentration signal, reheated steam dissolved oxygen
Spend dissolved oxygen concentration signal in signal and/or desuperheating water.
It preferably, further include being connected to the reducing agent solution case of dosing pipe supply side, and be separately positioned on chemical feed pipe
The metering pump and heater of road；The control terminal of the output end connection metering pump of programmable controller.
Further, the heater is arranged outside dosing pipe, and heater is electric heating.
Preferably, the output end of superheater reduction treatment dosing pipe is connected to economizer influent header, economizer exit
On header or water-cooling wall inlet header.
Preferably, the output end of reheater reduction treatment dosing pipe connects the output end of cold main pipe again.
Preferably, the output end of spray desuperheating reduction treatment dosing pipe is separately connected the level-one spray desuperheating in superheater
The input terminal of second level direct-contact desuperheater on device and in reheater.
Steam reduction processing method in a kind of boiler steam/water circulating, using reducing agent solution, by respectively to superheated steam,
Reheated steam and/or direct-contact desuperheater desuperheating water orientation dosing implement segmentation reduction treatment, reduce steam in dissolved oxygen concentration simultaneously
Dissolving and reducing agent concentration is improved to setting value, vapour system is made to be in anaerobic or hypoxemia operating condition.
Preferably, the reducing agent solution uses mass concentration for the diamine solution or mass concentration of 0.5%-1.0%
For the hydrogen-rich aqueous solution of 5~20mg/L.
Preferably, specific step is as follows；
Step 1, the reducing agent solution of configuration setting concentration,
Step 2, at least step in following steps S1, S2 and S3 is executed；
Superheater reduction treatment dosing pipe is arranged in S1；Main steam dissolved oxygen concentration is measured, and dissolved oxygen amount signal is inputted
Programmable controller automatically adjusts dosage by PID control, female to the steam between economizer influent header and main vapour header
Reducing agent solution is added in pipe, and control superheated steam is in dissolved oxygen≤3ug/L, dissolved hydrogen≤50ug/L；
Reheater reduction treatment dosing pipe is arranged in S2；Reheated steam dissolved oxygen concentration is measured, and dissolved oxygen amount signal is defeated
Enter programmable controller, dosage is automatically adjusted by PID control, reducing agent solution is added in Xiang Lengzai jet chimney, and control is again
Hot steam is in dissolved oxygen≤3ug/L, dissolved hydrogen≤50ug/L；
Spray desuperheating reduction treatment dosing pipe is arranged in S3；Dissolved oxygen concentration in water supply is measured, and dissolved oxygen amount signal is defeated
Enter programmable controller, dosage is automatically adjusted by PID control, reducing agent solution is added to water pipeline, control water spray subtracts
Warm device desuperheat water management superheated steam is in dissolved oxygen≤3ug/L, diamine concentration≤150ug/L.
Further, maximum heating temperature≤300 DEG C of the respectively arranged heater to reducing agent on dosing pipe.
Compared with prior art, the invention has the following beneficial technical effects:
System of the present invention is added also by the dosing pipe of setting into the liquid line of steam circulation side cooperation
Former agent solution, the different phase that the method corresponds to steam carry out reducing agent solution in the addition of steam side, so as to straight
It connects and dissolved oxygen amount control is carried out to steam in steam circulation side, be oriented dosing and implement segmentation reduction treatment, steam system can be made
System is in anaerobic or hypoxemia operating condition；To directly carry out real-time and accurate control to it according to the dissolved oxygen demand for control of steam side
System can not only eliminate flowing accelerated corrosion problem, but also oxygen content in steam can be made to reduce to ideal hypoxemia or anaerobic water
It is flat to solve the problems, such as to postpone greatly to bring dissolved oxygen into control characteristic and desuperheating water existing for existing oxygenation technology, it avoids more than needed
Oxygen enters vapour system to superheater, the issuable adverse effect of reheater.
Detailed description of the invention
Fig. 1 is a kind of Boiler Steam reduction treatment system structural schematic diagram of the present invention.
In figure: 1. economizer influent headers；2. economizer；3. economizer exit header；4. water-cooling wall；5. steam-water separation
Device；6. superheater；7. level-one direct-contact desuperheater；8. steam turbine high-pressure cylinder；9. cold main pipe again；10. reheater；11. second level is sprayed water
Attemperator；12. superheater reduction treatment dosing pipe；13. reheater reduction treatment dosing pipe；14. spray desuperheating also original place
Manage dosing pipe；15. reducing agent solution case；16. metering pump；17. heater；18. programmable controller；19. oxygen-eliminating device；20.
High-pressure heater.
Specific embodiment
Below with reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
The invention discloses a kind of Boiler Steam reduction treatment systems comprising programmable controller 18, and passing through can
Superheater reduction treatment dosing pipe 12, reheater reduction treatment dosing pipe 13 and the spray desuperheating that programmable controller 18 controls
Reduction treatment dosing pipe 14；Its processing method configures a certain concentration reducing agent solution using diamine or hydrogen-rich water, passes through difference
Segmentation reduction treatment is implemented to superheated steam/reheated steam/direct-contact desuperheater desuperheating water orientation dosing, vapour system is made to be in nothing
Oxygen or hypoxemia operating condition；The present invention, which solves, to be postponed greatly to bring dissolved oxygen into control characteristic and desuperheating water existing for existing oxygenation technology
The problem of, it avoids oxygen more than needed and enters vapour system to superheater 17, the issuable adverse effect of reheater 10.
Steam reduction processing method in a kind of boiler steam/water circulating includes at least Superheater/Reheater/spray desuperheating reduction
The combination for handling one or more of Adding medicine control pipeline, by being added respectively into superheated steam/reheated steam/desuperheating water
Reducing agent reduces dissolved oxygen concentration and improves dissolved hydrogen/diamine concentration to setting value.It specifically includes:
Superheater reduction treatment dosing pipe 12 is arranged in S1, and configures the reducing agent solution of setting concentration；Measure main steam
Dissolved oxygen concentration, and dissolved oxygen amount signal is inputted into programmable controller 18, dosage, Xiang Shengmei are automatically adjusted by PID control
Reducing agent solution is added in steam main pipe between device influent header and main vapour header, and control superheated steam is in dissolved oxygen≤3ug/
L, dissolved hydrogen≤50ug/L；
Reheater reduction treatment dosing pipe 13 is arranged in S2, and configures the reducing agent solution of setting concentration；Reheating is measured to steam
Vapour dissolved oxygen concentration, and dissolved oxygen amount signal is inputted into programmable controller 18, dosage, Xiang Leng are automatically adjusted by PID control
Reducing agent solution is added in jet chimney again, and control reheated steam is in dissolved oxygen≤3ug/L, dissolved hydrogen≤50ug/L；
Spray desuperheating reduction treatment dosing pipe 43 is arranged in S3, and configures the reducing agent solution of setting concentration；Measure water supply
Middle dissolved oxygen concentration, and dissolved oxygen amount signal is inputted into programmable controller 18, dosage is automatically adjusted by PID control, to spray
Reducing agent solution is added in waterpipe, and control desuperheat water management superheated steam is in dissolved oxygen≤3ug/L, diamine concentration≤150ug/
L。
Wherein, dosing pipe is connect with 15 water outlet of reducing agent solution case respectively, and metering is respectively arranged on dosing pipe
Pump 16 and heater 17；The control terminal of the output end connection metering pump 16 of programmable controller 18；The reducing agent is hydrazine.
Heater 17 is arranged outside dosing pipe, and heater 17 is electric heating；Maximum heating temperature≤300 DEG C are arranged in it.
Specifically, as shown in Figure 1, in the steam/water circulating of thermal power plant, oxygenation after condensed water desalination, through low-pressure heater 17
After entering 19 deoxygenation of oxygen-eliminating device, then 19 down-comer oxygenation of oxygen-eliminating device after heating, after feed pump pressurizes, into high-pressure heater
After 20 heating, sequentially enters economizer influent header 1, economizer 2, economizer exit header 3 and heat, heated into water-cooling wall 4
Enter steam-water separator 5 as steam water interface, the saturated vapor separated is heated through superheater 6 and sprayed water by level-one
7 climate comfort of attemperator forms superheated steam, and the high pressure cylinder into steam turbine 8 does work, and steam exhaust enters cold main pipe again 9 and is delivered to again
Hot device 10 heats again, adjusts temperature through second level direct-contact desuperheater 11 and forms the intermediate pressure cylinder acting that reheated steam enters steam turbine 8.
Embodiment 1:
By taking certain power plant #3 unit boiler is the overcritical Thermal generation unit of 350MW as an example, which starts using AVT (O)
Operating condition operation has carried out chemical cleaning after rear repeatedly booster, after be changed to second level oxygenated treatment.First order oxygenation is arranged in condensed water
Processing equipment exports main pipe, and second level setting exports the preposition pumping intake piping of feed pump in oxygen-eliminating device.Ammonification control is carried out simultaneously to give
Water pH, the outlet of ammonification point condensate polishing treatment, ammonia residual have Automatic Ammonia adding device to pass through the conductivity and condensed water after ammonification
Flow co- controlling.Regulation provides 0.1 μ s/cm of water supply hydrogen conductivity <, dissolved oxygen≤10~150 μ g/L, pH value (25 DEG C) 8.5
~9.3,0.1 μ s/cm of the μ g/L of Quan Tie≤2, main steam hydrogen conductivity <, the μ g/L of Quan Tie≤2, condensed water dissolved oxygen≤20 μ g/L.
Condensate pump outlet, oxygen-eliminating device import, oxygen-eliminating device outlet, economizer entrance, the draining of starting separator, master are tested in operation respectively
The dissolved oxygen of steam, reheater steam are as follows: 12.1 μ g/L, 35.9 μ g/L, 6.55 μ g/L, 52.9 μ g/L, 5.68 μ g/L, 29.3 μ
g/L,13.8μg/L.Chemical cleaning shielded outlet sample (TP347) scale thickness 36-48um after 1 year.
In order to reduce the dissolved oxygen content of main steam and reheater steam, using adding diamine mode.It is respectively set and at least wraps
Include Superheater/Reheater/spray desuperheating reduction treatment automatic dosing control system.
Configuration quality concentration is the diamine solution of 0.5%-1.0%；Measurement main steam dissolved oxygen concentration is 29.3 μ g/L, gives
Water flow 948.7t/h, programmable controller automatically adjust dosage according to dissolved oxygen amount signal, are added to water-cooling wall influent header
Diamine solution, control superheated steam are in dissolved oxygen≤3ug/L；
Configuration concentration is the diamine solution of 0.5%-1.0%；Measuring reheated steam dissolved oxygen concentration is 13.8 μ g/L, water supply
Flow 948.7t/h, programmable controller automatically adjust dosage, Xiang Leng according to dissolved oxygen amount signal and attemperation water flow signal
Diamine solution is added in jet chimney again, and control reheated steam is in dissolved oxygen≤3ug/L；
Configuration concentration is the diamine solution of 0.5%-1.0%；Measure 52.9 μ g/L of dissolved oxygen concentration, desuperheat water flow in water supply
34.1t/h is measured, programmable controller automatically adjusts dosage according to dissolved oxygen amount signal, diamine solution is added to desuperheating water main pipe,
Control desuperheating water dissolved oxygen≤3 μ g/L, diamine concentration≤20ug/L.
Embodiment 2:
By taking certain power plant #2 unit boiler is the overcritical Thermal generation unit of 350MW as an example, which is handled using AVT (O),
It is ammoniated using 2 points, first order setting exports feed pump in oxygen-eliminating device in Ion exchange resin equipment export main pipe, second level setting
Preposition pumping intake piping.0.1 μ s/cm of water supply hydrogen conductivity <, dissolved oxygen≤10 μ g/L, pH value (25 DEG C) 9.2~9.6 are controlled, entirely
Iron≤5 μ g/L, the 0.1 μ μ g/L of s/cm, Quan Tie≤5 of main steam hydrogen conductivity <, condensed water dissolved oxygen≤20 μ g/L.Operation 7 years
Afterwards, finishing superheater (T91 material) dirt amount is up to 1169g/m2, high temperature reheater (TP347HFG) 349g/m2, and period occurs
Multiple oxide skin falls off, booster.
Condensate pump outlet, oxygen-eliminating device import, oxygen-eliminating device outlet, economizer entrance, starting separation are tested in operation respectively
Device draining, main steam, reheater steam dissolved oxygen are as follows: 21.3 μ g/L, 21.6 μ g/L, 16.2 μ g/L, 13.7 μ g/L, 17.8 μ
g/L、19.6μg/L、18.8μg/L。
In order to reduce the dissolved oxygen content of main steam and reheater steam, using adding diamine mode.It is respectively set and at least wraps
Include Superheater/Reheater/spray desuperheating reduction treatment automatic dosing control system.
Configuration concentration is the diamine solution of 0.5%-1.0%；Measurement main steam dissolved oxygen concentration is 19.6 μ g/L, to water flow
840.5t/h is measured, programmable controller automatically adjusts dosage according to dissolved oxygen amount signal, and diamine is added to water-cooling wall influent header
Solution, control superheated steam are in dissolved oxygen≤3ug/L；
Configuration concentration is the diamine solution of 0.5%-1.0%；Measuring reheated steam dissolved oxygen concentration is 18.8 μ g/L, water supply
Flow 840.5t/h, programmable controller automatically adjust dosage according to dissolved oxygen amount signal, and diamine is added in Xiang Lengzai jet chimney
Solution, control reheated steam are in dissolved oxygen≤3ug/L；
Configuration concentration is the diamine solution of 0.5%-1.0%；Measure 13.7 μ g/L of dissolved oxygen concentration, desuperheat water flow in water supply
76.6t/h is measured, programmable controller automatically adjusts dosage according to dissolved oxygen amount signal, and it is molten that diamine is added to desuperheating water main pipe
Liquid controls desuperheating water dissolved oxygen≤3 μ g/L, diamine concentration≤20ug/L.
Embodiment 3:
By taking certain power plant #1 unit is the overcritical Thermal generation unit of 600MW as an example, which is handled using OT operating condition.
0.10 μ s/cm of water supply hydrogen conductivity <, 10~150 μ g/L of dissolved oxygen, pH value (25 DEG C) μ g/L of 8.5~9.3, Quan Tie≤5 are controlled,
The 0.10 μ μ g/L of s/cm, Quan Tie≤5 of main steam hydrogen conductivity <, main steam dissolved oxygen >=10 μ g/L.After operation 8 years, final stage overheat
Device (T91 material) dirt amount is up to 1320g/m2, high temperature reheater (TP347HFG) 438g/m2, and multiple oxide skin occurs for period
It falls off, booster.
Condensate pump outlet, oxygen-eliminating device import, oxygen-eliminating device outlet, economizer entrance, starting separation are tested in operation respectively
Device draining, main steam, reheater steam dissolved oxygen are as follows: 25.3 μ g/L, 23.8 μ g/L, 18.2 μ g/L, 14.7 μ g/L, 18.8 μ
g/L、19.9μg/L、18.7μg/L。
In order to reduce the dissolved oxygen content of main steam and reheater steam, using adding hydrogen-rich aqueous solution mode.It is respectively set
Including at least Superheater/Reheater/spray desuperheating reduction treatment automatic dosing control system.
Configuration quality concentration is the hydrogen-rich aqueous solution of 5~20mg/L；Measurement main steam dissolved oxygen concentration is 19.8 μ g/
L, feedwater flow 1610.5t/h, programmable controller automatically adjust dosage according to dissolved oxygen amount signal, join to water-cooling wall entrance
Diamine solution is added in case, and control superheated steam is in dissolved oxygen≤3ug/L, dissolution hydrogen concentration≤50ug/L；
Configuration quality concentration is the hydrogen-rich aqueous solution of 5~20mg/L；Measurement reheated steam dissolved oxygen concentration is 20.1 μ
G/L, feedwater flow 1620.3t/h, programmable controller automatically adjust dosage, Xiang Lengzai steam pipe according to dissolved oxygen amount signal
Diamine solution is added in road, and control reheated steam is in dissolved oxygen≤3ug/L, dissolution hydrogen concentration≤50ug/L；
Configuration quality concentration is the hydrogen-rich aqueous solution of 5~20mg/L；Measure water supply in 18.7 μ g/L of dissolved oxygen concentration,
Attemperation water flow 1565.2t/h, programmable controller automatically adjusts dosage, adds to desuperheating water main pipe according to dissolved oxygen amount signal
Enter diamine solution, control desuperheating water dissolved oxygen≤3 μ g/L, dissolution hydrogen concentration≤50ug/L.
Claims (10)
1. a kind of Boiler Steam reduction treatment system, which is characterized in that carry out PID control including dosing pipe and to dosing pipe
Programmable controller (18)；
The dosing pipe include in following three pipelines at least all the way,
Steam main pipe between connection economizer influent header (1) and main vapour header is used to be added the superheater of reducing agent solution also
Dosing pipe (12) are managed in original place,
The reheater reduction treatment dosing pipe (13) that cold jet chimney again is used to be added reducing agent solution is connected,
The spray desuperheating reduction treatment that the water pipeline of connection superheater (6) and reheater (10) is used to be added reducing agent solution adds
Pencil road (14)；
It is dense that the input terminal correspondence of the programmable controller (18) is connected into main steam dissolved oxygen concentration signal, reheated steam dissolved oxygen
Spend dissolved oxygen concentration signal in signal and/or desuperheating water.
2. a kind of Boiler Steam reduction treatment system according to claim 1, which is characterized in that further include being connected to dosing
The reducing agent solution case (15) of pipeline supply side, and the metering pump (16) and heater that are separately positioned on dosing pipe
(17)；The control terminal of output end connection metering pump (16) of programmable controller (18).
3. a kind of Boiler Steam reduction treatment system according to claim 2, which is characterized in that the heater (17)
It is arranged outside dosing pipe, heater (17) is electric heating.
4. a kind of Boiler Steam reduction treatment system according to claim 1, which is characterized in that superheater reduction treatment adds
The output end on pencil road (12) is connected to economizer influent header (1), economizer exit header (3) or water-cooling wall inlet header
On.
5. a kind of Boiler Steam reduction treatment system according to claim 1, which is characterized in that reheater reduction treatment adds
The output end on pencil road (13) connects the output end of cold main pipe again (9).
6. a kind of Boiler Steam reduction treatment system according to claim 1, which is characterized in that spray desuperheating reduction treatment
The output end of dosing pipe (14) be separately connected on the level-one direct-contact desuperheater (7) in superheater (6) and reheater (10) in
The input terminal of second level direct-contact desuperheater (11).
7. steam reduction processing method in a kind of boiler steam/water circulating, which is characterized in that reducing agent solution is used, by right respectively
Segmentation reduction treatment is implemented in superheated steam, reheated steam and/or the orientation dosing of direct-contact desuperheater desuperheating water, reduces and dissolves in steam
Oxygen concentration simultaneously improves dissolving and reducing agent concentration to setting value, and vapour system is made to be in anaerobic or hypoxemia operating condition.
8. steam reduction processing method in a kind of boiler steam/water circulating according to claim 7, which is characterized in that described
The hydrogen-rich that reducing agent solution uses mass concentration to be 5~20mg/L for the diamine solution or mass concentration of 0.5%-1.0% is water-soluble
Liquid.
9. steam reduction processing method in a kind of boiler steam/water circulating according to claim 7, which is characterized in that using power
Benefit requires Boiler Steam reduction treatment system described in 1-6 any one, and specific step is as follows；
Step 1, the reducing agent solution of configuration setting concentration,
Step 2, at least step in following steps S1, S2 and S3 is executed；
Superheater reduction treatment dosing pipe (12) are arranged in S1；Main steam dissolved oxygen concentration is measured, and dissolved oxygen amount signal is inputted
Programmable controller (18) automatically adjusts dosage by PID control, the water between economizer influent header and main vapour header
Reducing agent solution is added in vapour main pipe, and control superheated steam is in dissolved oxygen≤3ug/L, dissolved hydrogen≤50ug/L；
Reheater reduction treatment dosing pipe (13) are arranged in S2；Reheated steam dissolved oxygen concentration is measured, and dissolved oxygen amount signal is defeated
Enter programmable controller (18), dosage is automatically adjusted by PID control, reducing agent solution, control is added in Xiang Lengzai jet chimney
Reheated steam processed is in dissolved oxygen≤3ug/L, dissolved hydrogen≤50ug/L；
Spray desuperheating reduction treatment dosing pipe 14 is arranged in S3；Dissolved oxygen concentration in water supply is measured, and dissolved oxygen amount signal is inputted
Programmable controller (18) automatically adjusts dosage by PID control, and reducing agent solution, control water spray is added to water pipeline
Attemperator desuperheat water management superheated steam is in dissolved oxygen≤3ug/L, diamine concentration≤150ug/L.
10. steam reduction processing method in a kind of boiler steam/water circulating according to claim 9, which is characterized in that dosing
Maximum heating temperature≤300 DEG C of the respectively arranged heater (17) to reducing agent on pipeline.
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