CN108730953B - A kind of Marine Nuclear Power Plant once-through steam generator water supply deep deoxygenization system and its deoxidation method - Google Patents
A kind of Marine Nuclear Power Plant once-through steam generator water supply deep deoxygenization system and its deoxidation method Download PDFInfo
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- 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
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Abstract
A kind of Marine Nuclear Power Plant once-through steam generator water supply deep deoxygenization system and its deoxidation method, system include that condenser is bubbled deaerating plant, low-pressure heater, oxygen-eliminating device, deoxygenation film device and chemicals dosing plant；It is bubbled deaerating plant to be integrated in condenser, is bubbled deaerating plant and connects steam exhaust, while condenser also passes through condensate pump and connects low-pressure heater；Low-pressure heater connects steam exhaust, while the inlet of low-pressure heater and oxygen-eliminating device connects；Oxygen-eliminating device connects extracted steam from turbine or initial steam, while oxygen-eliminating device connects water supply system；Chemicals dosing plant is connect with water supply system；Deoxygenation film device is integrated in equalization tank, and equalization tank is connect with condenser.Method is combined by thermal de-aeration, hydrazine deoxygenation, deaerating membrane, constitutes multi-level oxygen scavenging sytsem.The present invention meets once-through steam generator peculiar to vessel water supply deep deoxygenization requirement under each operating condition；For partial function integration of equipments on existing device, cabin spaces utilization rate is high；It reduces consumables to use, good economy performance.
Description
Technical field
The invention belongs to secondary circuits to coagulate feedwater deaeration technology, and in particular to a kind of Marine Nuclear Power Plant once-through steam generator is to the depth of water
Spend deaerating type of cycles and its deoxidation method.
Background technique
In reactor and primary Ioops system, steam generator heat-transfer pipe as one, secondary circuit energy transmission interface with
And a part of primary Ioops pressure boundary, be the significant points in Nuclear Power System, secondary side water quality it is corroded have it is larger
It influences, needs to pay attention to, and oxygen content is an index particularly important in water quality.
Once-through steam generator water supply is required to be different from traditional marine boiler water supply and U-tube evaporator feedwater.Direct current
Evaporator feedwater oxygen content requires material in close relations with evaporator material, different, requires to differ greatly to water supply oxygen content.
In this project, according to the selection of material, it is desirable that once-through steam generator water supply oxygen content is 5ppb.This index and land nuclear power station water supply
Oxygen-containing figureofmerit is close, is far below the oxygen-containing figureofmerit of marine boiler water supply, U-tube evaporator feedwater index slightly below peculiar to vessel.This
Outside, it since once-through steam generator is not provided with sewage draining exit, can not be applied on ship using more salt oxygen scavenger.
Existing feedwater deaeration technology peculiar to vessel specifically includes that thermal deaerator deoxygenation, sodium sulfite dosing deoxygenation, deoxygenation tree
Rouge deoxygenation, condenser are bubbled deoxygenation, in addition, land also applies hydrazine to carry out deoxygenation with nuclear power field, chemical field, which has to apply, to be removed
Oxygen film carries out deoxygenation:
(1) thermal deaerator deoxygenation: being widely used in conventional steam dynamical system, generally uses air suspended type, integration
Oxygen-eliminating device, due to marine condition, thermal deaerator running parameter and equipment volume requirement etc., water supply oxygen content generally can only
Reach 50ppb, deoxygenation efficiency does not reach requirement, and land generally uses high pressure thermal deaerator with nuclear power station, due to use environment
Condition is preferable, and therrmodynamic system stable conditions, deoxygenation efficiency is preferable, can reach 5ppb to 7ppb.
(2) sodium sulfite dosing deoxygenation: water supply deep deoxygenization may be implemented, but due to there is saline deposit, generally
For natural-circulation evaporator feedwater deaeration, it is not suitable for once-through steam generator.
(3) deoxygen resin deoxygenation: deoxygen resin can be realized deoxygenation under room temperature, but deaerating effect is limited by equipment volume,
To realize that deep deoxygenization desired size is larger, and resin consumption is larger；Consider that resin replacement cost and equipment size, direct current steam
Resin deoxygenation is not used in hair device.
(4) condenser is bubbled deoxygenation: it is a kind of low temperature heating power deoxygenation technology, relevant device is typically integrated in condenser,
Occupied space is few, but there is the problems such as deaerating effect is unstable, noise is larger in practical applications.
(5) hydrazine dosing deoxygenation: it is widely used technology maturation in nuclear power field, deep deoxygenization may be implemented, and be suitable for
Once-through steam generator, but since hydrazine is inflammable and explosive, aboard ship with respect to confined space extensive application, there are risks.
(6) deaerating membrane deoxygenation: it is the deoxygenation technology risen in recent years in chemical field, is a kind of physics Deoxidization method, energy
Deoxygenation function is completed under normal temperature conditions, is not yet applied in nuclear power, ship domain, gives application waterborne in secondary circuit master, shortage makes
With experience, risk is larger, therefore considers to be used for system water supplement deoxygenation.
It is wanted in conclusion can satisfy once-through steam generator water supply deep deoxygenization currently without mature deoxygenation technology peculiar to vessel
It asks, needs to use for reference land the relevant technologies.Marine Nuclear Power Plant system generally uses atmosphere-type thermodynamic oxygen remover mutually to tie with sodium sulfite
Conjunction mode, due to Marine Nuclear Power Plant once-through steam generator oxygen content requirement raising and once-through steam generator is without blowdown, is considered as
Middle pressure thermal deaerator is combined with hydrazine deoxygenation.In order to utilize system waste heat, while reinforcing thermal deaerator efficiency, heating power removes
Low-pressure heater is set before oxygen device.Further, since in secondary coolant circuit system oxygen main source be condenser leak and system water supplement,
Therefore consider to integrate related deaeration plant to equalization tank in condenser.
Summary of the invention
The technical problem to be solved by the present invention is to provide one kind for existing deoxygenation technology above shortcomings peculiar to vessel
Marine Nuclear Power Plant once-through steam generator water supply deep deoxygenization system and its deoxidation method pass through thermal de-aeration, hydrazine deoxygenation, deaerating membrane
Equal various ways combine, and constitute multi-level oxygen scavenging sytsem, meet once-through steam generator peculiar to vessel and remove under each operating condition to water depth
Oxygen requirement；For partial function integration of equipments on existing device, cabin spaces utilization rate is high；System waste vapour energy is made full use of, together
When reduce consumables and use, system economy is good.
Used technical solution is the present invention to solve above-mentioned technical problem:
A kind of Marine Nuclear Power Plant once-through steam generator water supply deep deoxygenization system specifically includes that condenser, is bubbled deoxygenation dress
It sets, low-pressure heater, thermal deaerator, deoxygenation film device and chemicals dosing plant；
It is bubbled deaerating plant to be integrated in condenser, is bubbled deaerating plant and connects steam exhaust, while condenser also passes through condensate
Pump connection low-pressure heater；Low-pressure heater connects steam exhaust, while the inlet of low-pressure heater and thermal deaerator connects；Heat
Power oxygen-eliminating device connects extracted steam from turbine or initial steam, while thermal deaerator connects water supply system；Chemicals dosing plant and water supply system
Connection；Deoxygenation film device is integrated in equalization tank (for secondary circuit moisturizing), and equalization tank is connect with condenser, and equalization tank is adopted
With nitrogen envelope and atmospheric isolation.
According to the above scheme, the low-pressure heater uses surface heater.
According to the above scheme, the thermal deaerator uses the middle pressure thermal deaerator of spraying material filling type.
According to the above scheme, the chemicals dosing plant and hydrazine drug are arranged between dosing.
The present invention also provides a kind of deoxidation method of above-mentioned Marine Nuclear Power Plant once-through steam generator water supply deep deoxygenization system,
In conjunction with thermal de-aeration, hydrazine deoxygenation, it is bubbled deoxygenation, deaerating membrane deoxygenation, constitutes multi-level oxygen scavenging sytsem, include the following steps:
S1, deoxygenation film device are integrated in equalization tank, and the oxygen of secondary coolant circuit system is lowered into from source；
S2, bubbling deaerating plant are controlled the degree of supercooling of condensate in condenser within 0.6 DEG C using steam exhaust, are bubbled
Deoxygenation；
Condensate after S3, bubbling deoxygenation injects thermal deaerator, low-pressure heater through low-pressure heater by condensate pump
Condensate is heated using steam exhaust, condensate temperature is adjusted by steam exhaust flow control；
After S4, condensate enter thermal deaerator, condensate is heated using extracted steam from turbine or initial steam, deoxygenation；
S5, hydrazine dosing, deep deoxygenization are carried out finally by chemicals dosing plant.
According to the above scheme, according to thermal balance, heating steam quality flowmeter formula needed for the low-pressure heater is
In formula,
GL,S--- heating steam mass flow needed for low-pressure heater, units/kg/s；
GL,L--- pass through the condensate mass flow of low-pressure heater, units/kg/s；
h1--- condensate enthalpy, unit kJ/kg are exported after heating；
h2--- heating front entrance condensate enthalpy, unit kJ/kg；
h3--- heating steam enthalpy, unit kJ/kg；
h4--- steam condensation water enthalpy, unit kJ/kg；
ηL--- consider the coefficient of heat loss in low-pressure heater.
According to the above scheme, heating steam flow calculating formula needed for the thermal deaerator is
In formula,
Gh,S--- the mass flow of steam needed for thermal deaerator, kg/s；
Gh,L--- into the mass flow of thermal deaerator condensate, kg/s；
hd--- the enthalpy of saturated water, kJ/kg in thermal deaerator；
hi--- into the enthalpy of thermal deaerator condensate, kJ/kg；
hh,S--- heating steam enthalpy, kJ/kg；
ηd--- consider the coefficient of heat loss in thermal deaerator.
According to the above scheme, the hydrazine additional amount of the chemicals dosing plant injection hydrazine calculates according to the following formula,
G=C+ β (3)
In formula, G --- hydrazine additional amount, unit mg/L；
C --- content of oxygen dissolved in water, unit mg/L；
β --- hydrazine excess quantity, unit mg/L；β takes 0.02~0.05mg/L.
Compared with prior art, the invention has the following beneficial effects:
1, evaporator feedwater water quality is the important parameter for ensureing evaporator long-term safety, stable operation, and the present invention passes through heat
The various ways such as power deoxygenation, hydrazine deoxygenation, bubbling deoxygenation, deaerating membrane combine, and constitute multi-level oxygen scavenging sytsem, meet direct current
Evaporator feedwater oxygen content 5ppb index realizes water supply deep deoxygenization under stable state, dynamic operation condition, and deaerating effect is good under each operating condition
It is good；
2, under the premise of meeting deoxygenation index request, since offshore platform cabin spaces are relatively limited, consider deoxygenation
Film relevant device and equalization tank are integrated, are bubbled deaerating plant and condenser is integrated, save cabin spaces；
3, pressure thermal deaerator carries out deoxygenation in first using, then uses hydrazine deep deoxygenization, reduces hydrazine and uses, hydrazine is made
For a kind of inflammable toxic chemical depletion product, the drug that practices every conceivable frugality uses, can reduce operating cost, be also beneficial to platform safety
Protection.
4, hydrazine protection is reinforced in control hydrazine diffusion, and the storage of independent hydrazine, dosing region is arranged, with other cabins every
From, reinforce the region control, it is desirable that keep negative pressure, air ejector, thermal deaerator are vented to the negative pressure region, avoid hydrazine in vapour
Diffusion, is conducive to centralized control in engine room, and region related system design considers the inflammable and explosive characteristic of hydrazine.
5, low-pressure heater is set before thermal deaerator, is on the one hand conducive to the raising of thermal deaerator deoxygenation efficiency, separately
On the one hand the recycling for being conducive to system waste heat is conducive to improve system economy；
6, feedwater deaeration field is coagulated in ship, is firstly introduced hydrazine deoxygenation technology and deaerating membrane deoxygenation technology, is removed with heating power
Oxygen cooperation, guarantees concentration and deposition without salt in evaporator, is suitable for once-through steam generator.
7, secondary coolant circuit system moisturizing is generally from equalization tank, since moisturizing is the main source of oxygen in secondary circuit,
Deoxygenation film device is integrated in equalization tank, the oxygen of secondary coolant circuit system is lowered into from source, system parameter is avoided to vibrate feelings
Under condition, oxygen content is uprushed.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of Marine Nuclear Power Plant once-through steam generator water supply deep deoxygenization system of the present invention；
In figure, 1- condenser, 2- is bubbled deaerating plant, and 3- condensate pump, 4- low-pressure heater, 5- thermal deaerator, 6- adds
Medicine device, 7- deoxygenation film device, 8- equalization tank.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
As shown in Figure 1, Marine Nuclear Power Plant once-through steam generator water supply deep deoxygenization system of the present invention, specifically includes that condenser
1, be bubbled deaerating plant 2, low-pressure heater 4, thermal deaerator 5, deoxygenation film device 7 and chemicals dosing plant 6 (further include sensor and
With circuits).
It is bubbled deaerating plant 2 to be integrated in condenser 1, is bubbled deaerating plant 2 and connects steam exhaust, while condenser 1 also passes through
Condensate pump 3 connects low-pressure heater 4；Low-pressure heater 4 connects steam exhaust, while the injection of low-pressure heater 4 and thermal deaerator 5
Mouth connection；Thermal deaerator 5 connects extracted steam from turbine or initial steam, while thermal deaerator 5 connects water supply system；Chemicals dosing plant
6 connect with water supply system；Deoxygenation film device 7 is integrated in equalization tank 8 (for secondary circuit moisturizing), equalization tank 8 and condenser 1
Connection, equalization tank 8 is sealed using nitrogen and atmospheric isolation.
Marine Nuclear Power Plant once-through steam generator water supply deep deoxygenization system important technological parameters proposed by the present invention such as 1 institute of table
Show.
1 deaerating type of cycles important technological parameters of table
| Serial number | Technical parameter | Numerical value |
| 1 | Condenser pressure (kPa (a)) | 7.5 |
| 2 | Condenser condensate degree of supercooling (DEG C) | 0.6 |
| 3 | Condensate temperature (DEG C) after low-pressure heater | 90 |
| 4 | Steam exhaust pressure (MPa (a)) | 0.2 |
| 5 | Operating pressure (MPa (a)) in thermal deaerator | 0.362 |
| 6 | Feedwater outlet temperature (DEG C) after thermal de-aeration | 140 |
| 7 | Thermal deaerator heating steam pressure (MPa (a)) | 3.4 |
| 8 | Thermal deaerator heats vapor (steam) temperature (DEG C) | 275 |
| 9 | Condenser moisturizing oxygen content (ppb) | 50 |
| 10 | Thermal deaerator exports water supply oxygen content (ppb) | 7 to 15 |
| 11 | Water supply oxygen content (ppb) | 5 |
Marine Nuclear Power Plant once-through steam generator water supply deep deoxygenization system capital equipment explanation:
1) condenser is bubbled deaerating plant
It is heated using steam exhaust, condensate degree of supercooling is within 0.6 DEG C in the bubbling control condenser 1 of deaerating plant 2, condensate
Oxygen content is less than 50ppb, larger due to being bubbled 2 noise of deaerating plant, if later period test finds that other equipment deoxygenation performances are good
It is good, it may be considered that deactivate and be bubbled deaerating plant 2.
2) low-pressure heater 4
Low-pressure heater 4 uses surface heater, and using steam exhaust heating condensate to 90 ± 5 DEG C, recovery system waste heat is weary
Vapor condensed water returns to condenser 1, and steam flow G is heated needed for obtaining low-pressure heater 4 according to thermal balanceL,SCalculating formula.
3) thermal deaerator 5
Thermal deaerator 5 uses the middle pressure thermal deaerator of spraying material filling type, due to atomic marine plant load variations
Greatly, therefore spring nozzle is used, guarantees deaerating effect under different load.Thermal deaerator 5 heat steam be steam extraction or initial steam,
Maintaining pressure in thermal deaerator 5 is 0.362MPa.In the steady situation of sea situation, water outlet oxygen content is less than 7ppb, is tilting, is shaking
Under the conditions of pendulum (correlation values refer to " steel seagoing vessel classification rules "), water outlet oxygen content is less than 15ppb.
Heating steam flow G needed for obtaining middle pressure thermal deaerator according to Herry lawh,SCalculating formula, any gas exist
Solubility b in water is directly proportional to partial pressure Pb of this kind of gas on gas-water interface, is inversely proportional with the temperature of water, i.e.,
The solubility of b --- gas in water, mg/L；
Pb--- partial pressure Pb, MPa of the gas on gas-water interface；
ψ --- Herry coefficient, it is related with the type of gas and temperature；
Therefore the deoxygenation performance of pressure thermal deaerator is better than atmospheric type deaerator in.
In addition, in order to meet the needs of evaporator is to water supply under load change dramatically and accident conditions, thermal deaerator 5
Normal work water capacity need guarantee with declared working condition flow to evaporator water supply time be not less than 3min.
4) deoxygenation film device 7, deoxygenation film device 7 are integrated in equalization tank 8, monitor the water quality of equalization tank 8, guarantee water tank
Interior oxygen content is lower than 50ppb, while requiring equalization tank 8 using nitrogen envelope and atmospheric isolation, passes through nitrogen aeration valve and exhaust valve
8 pressure of equalization tank is controlled to stablize.
5) chemicals dosing plant, when water supply oxygen content occurs lower than required value or 5 operating pressure of thermal deaerator greater than scheduled
Hydrazine is injected when range, guarantees that water supply oxygen content meets 5ppb requirement.Wherein, hydrazine reacts with remaining oxygen in water supply
Chemical equation is
N2H4+O2→N2+2H2O
Hydrazine additional amount is calculated according to formula (3).
Since hydrazine is inflammable toxic, chemicals dosing plant and hydrazine drug should be arranged between dosing.The region should maintain negative pressure, wind
The relevant devices such as machine need to consider hydrazine explosive properties, need corresponding safeguard procedures into the region.Simultaneously by air ejector,
The steam discharge of thermal deaerator 5 is discharged into the region and hydrazine is avoided to spread in steam turbine room, is conducive to centralized control.
The above is presently preferred embodiments of the present invention, but the present invention should not be limited to the embodiment and attached drawing institute
Disclosure.So all do not depart from the lower equivalent or modification completed of spirit disclosed in this invention, guarantor of the present invention is both fallen within
The range of shield.
Claims (8)
1. a kind of Marine Nuclear Power Plant once-through steam generator water supply deep deoxygenization system, which is characterized in that specifically include that condenser, drum
Steep deaerating plant, low-pressure heater, thermal deaerator, deoxygenation film device and chemicals dosing plant；
It is bubbled deaerating plant to be integrated in condenser, is bubbled deaerating plant and connects steam exhaust, while condenser is also connected by condensate pump
Connect low-pressure heater；Low-pressure heater connects steam exhaust, while the inlet of low-pressure heater and thermal deaerator connects；Heating power removes
Oxygen device connects extracted steam from turbine or initial steam, while thermal deaerator connects water supply system；Chemicals dosing plant is connect with water supply system；
Deoxygenation film device is integrated in equalization tank, and equalization tank is connect with condenser, and equalization tank is sealed using nitrogen and atmospheric isolation.
2. Marine Nuclear Power Plant once-through steam generator water supply deep deoxygenization system as described in claim 1, which is characterized in that described low
Heater is pressed to use surface heater.
3. Marine Nuclear Power Plant once-through steam generator water supply deep deoxygenization system as described in claim 1, which is characterized in that the heat
Power oxygen-eliminating device uses the middle pressure thermal deaerator of spraying material filling type.
4. Marine Nuclear Power Plant once-through steam generator water supply deep deoxygenization system as described in claim 1, which is characterized in that described to add
Medicine device and hydrazine drug are arranged between dosing.
5. a kind of described in any item Marine Nuclear Power Plant once-through steam generator water supply deep deoxygenization systems of the claims 1~4
Deoxidation method in conjunction with thermal de-aeration, hydrazine deoxygenation, is bubbled deoxygenation, deaerating membrane deoxygenation, constitutes multi-level oxygen scavenging sytsem, special
Sign is, includes the following steps:
S1, deoxygenation film device are integrated in equalization tank, and the oxygen of secondary coolant circuit system is lowered into from source；
S2, bubbling deaerating plant are controlled the degree of supercooling of condensate in condenser within 0.6 DEG C using steam exhaust, be bubbled and are removed
Oxygen；
S3, the condensate being bubbled after deoxygenation inject thermal deaerator through low-pressure heater, low-pressure heater uses by condensate pump
Condensate is heated in steam exhaust, adjusts condensate temperature by steam exhaust flow control；
After S4, condensate enter thermal deaerator, condensate is heated using extracted steam from turbine or initial steam, deoxygenation；
S5, hydrazine dosing, deep deoxygenization are carried out finally by chemicals dosing plant.
6. the deoxidation method of Marine Nuclear Power Plant once-through steam generator water supply deep deoxygenization system as claimed in claim 5, feature
It is, according to thermal balance, heating steam quality flowmeter formula needed for the low-pressure heater is
In formula,
GL,S--- heating steam mass flow needed for low-pressure heater, units/kg/s；
GL,L--- pass through the condensate mass flow of low-pressure heater, units/kg/s；
h1--- condensate enthalpy, unit kJ/kg are exported after heating；
h2--- heating front entrance condensate enthalpy, unit kJ/kg；
h3--- heating steam enthalpy, unit kJ/kg；
h4--- steam condensation water enthalpy, unit kJ/kg；
ηL--- consider the coefficient of heat loss in low-pressure heater.
7. the deoxidation method of Marine Nuclear Power Plant once-through steam generator water supply deep deoxygenization system as claimed in claim 5, feature
It is, heating steam flow calculating formula needed for the thermal deaerator is
In formula,
Gh,S--- the mass flow of steam needed for thermal deaerator, kg/s；
Gh,L--- into the mass flow of thermal deaerator condensate, kg/s；
hd--- the enthalpy of saturated water, kJ/kg in thermal deaerator；
hi--- into the enthalpy of thermal deaerator condensate, kJ/kg；
hh,S--- heating steam enthalpy, kJ/kg；
ηd--- consider the coefficient of heat loss in thermal deaerator.
8. the deoxidation method of Marine Nuclear Power Plant once-through steam generator water supply deep deoxygenization system as claimed in claim 5, feature
It is, the hydrazine additional amount of the chemicals dosing plant injection hydrazine calculates according to the following formula,
G=C+ β (3)
In formula, G --- hydrazine additional amount, unit mg/L；
C --- content of oxygen dissolved in water, unit mg/L；
β --- hydrazine excess quantity, unit mg/L；β takes 0.02~0.05mg/L.
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