CN102408148B - Feed water treatment method of thermal generator set - Google Patents
Feed water treatment method of thermal generator set Download PDFInfo
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- CN102408148B CN102408148B CN 201110299982 CN201110299982A CN102408148B CN 102408148 B CN102408148 B CN 102408148B CN 201110299982 CN201110299982 CN 201110299982 CN 201110299982 A CN201110299982 A CN 201110299982A CN 102408148 B CN102408148 B CN 102408148B
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Abstract
Belonging to the technical field of electric power and power engineering, the invention discloses a feed water treatment method of a thermal generator set. The method comprises: adding an oxidant before a low-pressure heater or/and a high-pressure heater so as to inhibit flow accelerated corrosion in a feed water system; adding a reducing agent after the high-pressure heater for reacting with the oxidant so as to make the concentration of dissolved oxygen in water within a boiler system lower than a predetermined value, thus eliminating the reinforcing effect of oxygen on boiler pipe metal oxidation rate during oxygenation treatment. The method of the invention can inhibit flow accelerated corrosion in a feed water system and reduce oxygen corrosion on the inner wall of a boiler pipe simultaneously.
Description
Technical field
The invention belongs to electric power and power engineering technology field, particularly a kind of thermal power generation unit feedwater treatment method.
Background technology
At present, super (surpassing) critical thermal power generation unit feedwater is handled and mainly contained dual mode: full volatility handles (AVT) and oxygenation is handled (OT).AVT advocates deoxygenation in system, suppresses oxygen corrosion, comprises AVT (R) and AVT (O).OT advocates oxygenation in system, forms the zone of oxidation with protectiveness.These two kinds of feedwater treatment methods all are that total system (comprising low pressure heater, high pressure heater and boi1er tube system) is implemented.
When super (surpassing), critical thermal power generation unit adopted the AVT mode, produce the accelerated corrosion (FAC) of flowing, make the iron ion content in the feedwater that enters boiler higher in water feeding systems such as low pressure heater and high pressure heaters.Water conservancy project matter changes above-critical state into from subcritical attitude in boiler, a lot of variations have taken place its rerum natura, is become nonpolar by polarity.Therefore the iron ion in the stove water is separated out in pipelines such as water wall, superheater, forms zone of oxidation then.
In order to overcome the shortcoming of AVT mode, produced the oxygenation processing mode.Oxygenation is handled in feedwater and is added oxygen, can form compact oxidation layer in the metallic surface, has effectively suppressed the mobile accelerated corrosion of water feeding systems such as low pressure heater and high pressure heater, makes that iron ion content reduces in the feedwater that enters boiler.Along with the application of oxygenation processing in super (surpassing) critical unit, find that some power plant zone of oxidation generating rate in superheater and reheater piping is too fast, a series of problems such as pipeline overtemperature, zone of oxidation stripping obstruction booster and blade flushing corrosion have appearred.
Therefore, the feedwater processing mode of prior art can not suppress the mobile accelerated corrosion of water feeding system simultaneously and reduce the boi1er tube inner wall corrosion.
Summary of the invention
The present invention is proposed in view of the above problem of prior art is special.The invention provides a kind of thermal power generation unit feedwater treatment method, can suppress the mobile accelerated corrosion of water feeding system simultaneously and reduce the boi1er tube inner wall corrosion.
A kind of thermal power generation unit feedwater treatment method provided by the invention comprises: add oxygenant before low pressure heater or/and before the high pressure heater; Behind high pressure heater, add reductive agent, make boiler systems stove oxygen in water concentration be lower than preset value.
Preferably, behind high pressure heater, add reductive agent and comprise in the following mode one or more:
Method one, in high pressure heater outlet back, on the economizer preceding pipeline, add reductive agent;
Method two, add reductive agent at water wall lower collecting box place.
Preferably, this method also comprises: according to dissolved oxygen monitoring of economizer inlet and feedwater flow Signal Regulation reductive agent add-on, perhaps regulate the reductive agent add-on according to economizer inlet dissolved oxygen content and oxygenant add-on.
Preferably, comprise at adding reductive agent behind the high pressure heater: adopt the high-pressure pump mode behind high pressure heater, to inject reductive agent.
Preferably, add oxygenant before low pressure heater or/and before the high pressure heater and comprise in the following mode one or more:
Method one, mix the female pipe of a bed outlet place in the condensed water precision processing and add an oxygenant;
Method two, add oxygenant at the deoxygenator pipe place that falls in export;
Method three, mix the female pipe of a bed outlet place in the condensed water precision processing and add an oxygenant, at the deoxygenator auxiliary oxygenant that adds in pipe place that falls in export.
Preferably, make that dissolved oxygen concentration is 30-150 μ g/L in the water feeding system at low pressure heater or/and add oxygenant before the high pressure heater.
Preferably, behind high pressure heater, add reductive agent, react, make economizer inlet dissolved oxygen less than preset value 7 μ g/L with oxygenant.
According to feedwater treatment method provided by the invention,, can suppress the mobile accelerated corrosion in the water feeding system by adding oxygenant before low pressure heater or/and before the high pressure heater; Make that by behind high pressure heater, adding reductive agent the dissolved oxygen concentration of stove water is lower than preset value in the boiler systems, can remove the enhancement of hyperoxia boi1er tube burning speed.Thereby can suppress the mobile accelerated corrosion of water feeding system simultaneously and reduce the boi1er tube inner wall corrosion.
The present invention also provides a kind of high pressure that is applied to aforesaid method to add the reductive agent complexes, and this device comprises: container for storing liquid, and it is used to store reductant solution; The highly pressurised liquid volume pump, its inlet links to each other with container for storing liquid, and outlet can be connected to the boi1er tube system behind the high pressure heater, is used to receive the flow control instruction of self-controller, regulates the reductive agent output flow according to the flow control instruction; Controller, it links to each other with described highly pressurised liquid volume pump, is used for to highly pressurised liquid volume pump transmitted traffic steering order, makes that stove water dissolution oxygen concn is lower than preset value in the boi1er tube system.
Preferably, between outlet of highly pressurised liquid volume pump and boi1er tube system, also be connected with surge tank, tensimeter, reducing valve, gate valve and reverse checkvalve in turn; Between container for storing liquid and highly pressurised liquid volume pump, be provided with strainer.
Preferably, this system also comprises: automatic dispensation apparatus, and it links to each other with container for storing liquid, and being used for provides reductive agent strong solution and dilution water to form reductant solution to container for storing liquid.
Preferably, automatic dispensation apparatus comprises successively the reductive agent bucket that connects, gets liquid pump, reductive agent under meter and reductive agent gate valve, and the reductive agent gate valve links to each other with container for storing liquid; Also comprise the dilution water source, dilution water flow meter and the dilution water gate valve that connect successively, the dilution water gate valve links to each other with container for storing liquid.
Preferably, this system also comprises the automated dispensing controller, and it links to each other with automatic dispensation apparatus, is used to provide reductive agent strong solution and dilution water proportioning signal, send instruction to motorized valve, by reductive agent under meter and dilution water flow meter control reductive agent strong solution and dilution water ratio.
Preferably, container for storing liquid comprises agitator, is used to stir reductive agent strong solution and dilution water to form reductant solution.
The present invention also provides a kind of thermal power generation unit water treatment system, can suppress the mobile accelerated corrosion of water feeding system and reduce the boi1er tube inner wall corrosion.This system comprises: the oxygenant adding apparatus is used for adding before low pressure heater or/and before the high pressure heater oxygenant; The reductive agent adding apparatus is used for adding reductive agent behind high pressure heater, makes boiler systems stove oxygen in water concentration be lower than preset value.Described reductive agent adding apparatus is that above-mentioned high pressure adds the reductive agent complexes.
Preferably, can the oxygenant adding apparatus be set in following any one or a plurality of position: position one, oxygenant adding apparatus are positioned at the condensed water precision processing and mix the female pipe of a bed outlet place; Position two, oxygenant adding apparatus are positioned at the deoxygenator pipe place that falls in export; Position three, oxygenant adding apparatus are located at the condensed water precision processing and mix bed outlet female pipe place and the deoxygenator pipe place that falls in export.
Preferably, can the reductive agent adding apparatus be set in following any one or a plurality of position, position one, reductive agent adding apparatus be positioned at high pressure heater outlet back, on the economizer preceding pipeline; Position two, reductive agent adding apparatus are positioned at water wall lower collecting box place.
Thermal power generation unit feedwater treatment method provided by the invention, high pressure add the reductive agent complexes and the main application of thermal power generation unit water treatment system is super (surpassing) critical thermal power generation unit.
The water treatment system that provides according to an aspect of the present invention, the oxygenant adding apparatus can suppress the mobile accelerated corrosion in the water feeding system by adding oxygenant before low pressure heater or/and before the high pressure heater; The reductive agent adding apparatus makes that by add reductive agent behind high pressure heater the dissolved oxygen concentration of stove water is lower than preset value in the boiler systems, can remove the enhancement of oxygenation processing, thereby can suppress the mobile accelerated corrosion of water feeding system simultaneously and reduce the boi1er tube inner wall corrosion boi1er tube burning speed.
Description of drawings
The accompanying drawing that constitutes the part of specification sheets has been described embodiments of the invention, and is used to explain principle of the present invention together with the description.
With reference to accompanying drawing, according to following detailed, can be expressly understood the present invention more, wherein:
Fig. 1 illustrates the schema of an embodiment of super (surpassing) critical thermal power generation unit feedwater treatment method of the present invention;
Fig. 2 illustrates the structure iron of an embodiment of super (surpassing) critical thermal power generation unit water treatment system of the present invention;
Fig. 3 illustrates the structure iron of another embodiment of super (surpassing) critical thermal power generation unit water treatment system of the present invention;
Fig. 4 illustrates the structure iron that high pressure of the present invention adds an embodiment of reductive agent complexes;
Fig. 5 illustrates the structure iron that high pressure of the present invention adds another embodiment of reductive agent complexes;
Fig. 6 illustrates the schema that one embodiment of the present of invention middle controller is determined the reductive agent add-on;
Fig. 7 illustrates the schema that an alternative embodiment of the invention middle controller is determined the reductive agent add-on.
Embodiment
Describe various exemplary embodiment of the present invention in detail now with reference to accompanying drawing.It should be noted that: unless specify in addition, the parts of setting forth in these embodiments and positioned opposite, numeral expression formula and the numerical value of step do not limit the scope of the invention.
Simultaneously, should be understood that for convenience of description that the size of the various piece shown in the accompanying drawing is not to draw according to the proportionlity of reality.
Below be illustrative to the description only actually of at least one exemplary embodiment, never as any restriction to the present invention and application or use.
May not go through for the known technology of person of ordinary skill in the relevant, method and apparatus, but under suitable situation, described technology, method and apparatus should be regarded as authorizing the part of specification sheets.
In shown here and all examples of discussing, it is exemplary that any occurrence should be construed as merely, rather than as restriction.Therefore, other example of exemplary embodiment can have different values.
It should be noted that: represent similar terms in similar label and the letter accompanying drawing below, therefore,, then in accompanying drawing subsequently, do not need it is further discussed in case be defined in a certain Xiang Zaiyi accompanying drawing.
The application that oxygenation is handled makes boi1er tube inwalls such as part boiler water wall, superheater be in the dissolved oxygen supercritical water environment, and the oxidation of pipeline material in this environment has been suppressed or has been reinforced, and is international research focus in recent years.The inventor selects iron martensitic steel P92, austenitic steel Super304H, TP347HFG, HR3C and five ultra supercritical unit boilers of Mayari T24 pipe typical case to use steel as object, be exposed to 550 ℃, 600 ℃, in the 25MPa supercritical water, carry out the experimental study of anaerobic, 100ppb, 300ppb, 2000ppb different dissolved oxygen concentration respectively.The rate of oxidation that the result shows above five steel grades increases with the increase of dissolved oxygen content in the supercritical water.Even the part steel grade has formed fine and close protective membrane in the short time test under the rich oxygen content environment, rate of oxidation is relatively low, but has also obtained the rule that rate of oxidation increases with dissolved oxygen content in the test when long.Therefore according to the experimental study conclusion, the rate of oxidation of boi1er tube be suppressed, the dissolved oxygen content in the feedwater that enters boiler should be reduced.
Fig. 1 illustrates the schema of an embodiment of super (surpassing) critical thermal power generation unit feedwater treatment method of the present invention.
As shown in Figure 1, in step 102, add oxygenant before low pressure heater or/and before the high pressure heater.Oxygenant can be a pure oxygen for example, or comprises the mixed gas of oxygen.For example, in the following ways one or more: method one, mix the female pipe of a bed outlet place in the condensed water precision processing and add an oxygenant, method two, add oxygenant at the deoxygenator pipe place that falls in export, method three, the condensed water precision processing mix the female pipe of a bed outlet place add an oxygenant, at the deoxygenator auxiliary oxygenant that adds in pipe place that falls in export.
In the foregoing description,, can suppress the mobile accelerated corrosion in the water feeding system by adding oxygenant before low pressure heater or/and before the high pressure heater; Make that by behind high pressure heater, adding reductive agent the dissolved oxygen concentration of stove water is lower than preset value in the boiler systems, can remove the enhancement of oxygenation processing to boi1er tube burning speed, thereby can suppress the mobile accelerated corrosion of water feeding system simultaneously and reduce the boi1er tube inner wall corrosion, combine oxygenation and handle the advantage of the mobile accelerated corrosion of inhibition and the advantage that full volatility is handled reduction boi1er tube high temperature oxidation.
In one embodiment of the invention, make that dissolved oxygen concentration is 30-150 μ g/L in the water feeding system at low pressure heater or/and add oxygenant before the high pressure heater, behind high pressure heater, add reductive agent, make that the dissolved oxygen concentration of stove water is lower than 7 μ g/L in the boiler systems.It will be understood by those of skill in the art that to add oxygenant or reductive agent as required, thereby make dissolved oxygen concentration in the water feeding system in pre-determined range.
Fig. 2 illustrates the structure iron of an embodiment of super (surpassing) critical thermal power generation unit water treatment system of the present invention.
With reference to Fig. 2, add oxygen point 20 at the female pipe of the mixed bed outlet of condensed water precision processing in this embodiment and in water feeding system, add oxygenant, also can add the auxiliary oxygenants that add of oxygen point 21 at the deoxygenator pipe that falls in export, in the control water feeding system dissolved oxygen concentration in pre-determined range, 30-150 μ g/L for example.
After water conservancy project matter is come out from the polishing unit 3 that condenses, flow through low pressure heater 4, deoxygenator 8, service pump 9, high pressure heater 10, in above water feeding system, require water conservancy project matter dissolved oxygen concentration to remain on 30-150 μ g/L, play the effect that suppresses mobile accelerated corrosion.
Add reductive agent at high pressure heater 10 outlet conduit ammonification points 22, reductive agent and dissolved oxygen high pressure heater 10 be exported to economizer 13 along reacting in the Cheng Guandao, make dissolved oxygen concentration reduce, at economizer inlet dry point 23 monitoring dissolved oxygen degree, add reduction dosage according to dissolved oxygen concentration control ammonification point 22, control dissolved oxygen concentration less than preset value, for example 7 μ g/L.
Feedwater flow after the deoxygenation is through economizer 13, water wall 14, superheater 15, steam turbine high-pressure cylinder 16, reheater 17, in above boiler circuit, water conservancy project matter dissolved oxygen concentration remains on below the preset value (for example 7 μ g/L), avoids oxygen enhancement to burning speed in supercritical water environment and high-temperature steam environment.Label 18 expression intermediate pressure cylinder, label 19 expression low pressure (LP) cylinder, label 1 expression condenser, label 2 expression condensate pumps.
In the foregoing description, mix the female pipe of bed outlet in the condensed water precision processing and add oxygenant (can adopt purity oxygen), also can fall in export and manage the auxiliary oxygenant that adds in position at deoxygenator, add reductive agent (can adopt diamine) at the high pressure heater outlet conduit, make that in water feeding systems such as low pressure heater and high pressure heater keeping dissolved oxygen concentration is 30-150 μ g/L, high pressure heater to the economizer pipeline reductive agent and oxygenant by following reaction formula react (is example with diamine and oxygen):
N
2H
4+O
2＝2H
2O+N
2 (1)
Remove oxygen, make the stove oxygen in water concentration that enters economizer be lower than 7 μ g/L.
Because high pressure heater is long tens meters to the economizer pipeline, and 230～280 ℃ of temperature in the pipeline, reaction formula (1) is swift in response, but complete reaction.
In start-stop of generator set machine process, give water treatment with reference to relevant operation rule.After the water index is qualified, transfer to after the oxygenation processing, can adopt feedwater treatment method of the present invention.
Fig. 3 illustrates the structure iron of another embodiment of super (surpassing) critical thermal power generation unit water treatment system of the present invention.Mix the female pipe of bed outlet in the condensed water precision processing in the embodiments of figure 3 and add oxygen point 20 and in water feeding system, add oxygenant, also can be at the deoxygenator auxiliary oxygenant that adds in pipe place that falls in export, 24 add reductive agents at water wall lower collecting box place.
By add reductive agent at water wall lower collecting box place, can keep oxygenation to the flow effect of accelerated corrosion of low pressure heater, high pressure heater to the inhibition of economizer, and in the later boiler circuit of water wall 14, water conservancy project matter dissolved oxygen concentration remains on below the preset value, avoids oxygen enhancement to burning speed in supercritical water environment and high-temperature steam environment.
In Fig. 3 and Fig. 4, mix the female pipe of bed outlet and add oxygen point 20 and the deoxygenator pipe that falls in export and add oxygen point 21 places and can add oxygenant before low pressure heater or/and before the high pressure heater adding the precision processing of oxygen point condensed water by the oxygenant adding apparatus; Can behind high pressure heater, add reductive agent by the reductive agent adding apparatus at reductive agent adding point high pressure heater outlet conduit ammonification point 22 and water wall lower collecting box place 24, make boiler systems stove oxygen in water concentration be lower than preset value.The oxygenant adding apparatus can adopt one type of prior art syringe and equipment, also can be at device and the equipment of using specific design.The reductive agent adding apparatus can adopt the high pressure of introducing among the present invention to add the reductive agent complexes.
Water conservancy project matter is in very high pressure behind the high pressure heater, for example pressure is about 26～30MPa for the ultra supercritical unit, therefore the whole plant that requires to add reductive agent is a high-pressure system, especially highly pressurised liquid volume pump, the highly pressurised liquid volume pump can adopt ram pump, for example SSI company model is the high-pressure metering pump of PREP250, and its flow velocity is 0.1-250mL/min, and precision is 2%F.S..
Illustrate that below with reference to Fig. 4 and Fig. 5 high pressure of the present invention adds the specific embodiment of reductive agent complexes.
Fig. 4 illustrates the structure iron that high pressure of the present invention adds an embodiment of reductive agent complexes.As shown in Figure 4, these complexes comprise container for storing liquid 41, highly pressurised liquid volume pump 42 and controller 43.Container for storing liquid 41 storage reductant solutions.Reductive agent can adopt diamine, and diamine can be pure solution, also can be the solution of dilution.The inlet of highly pressurised liquid volume pump 42 links to each other with container for storing liquid 41, outlet can be connected to the boiler systems behind the high pressure heater, highly pressurised liquid volume pump 42 receives the flow control instruction of controller, regulates the reductive agent output flow that is added to boiler systems from container for storing liquid 41 according to the flow control instruction.Controller 43 links to each other with highly pressurised liquid volume pump 42 by data line, to highly pressurised liquid volume pump 42 transmitted traffic steering orders, makes that stove water dissolution oxygen concn is lower than preset value in the boi1er tube system, for example, and 7 μ g/L.For example, controller 43 receives economizer inlet dissolved oxygen content monitor signal a and feedwater flow signal c, gives highly pressurised liquid volume pump 42 according to steering logic output flow steering order, and highly pressurised liquid volume pump 42 is regulated flow output automatically; Perhaps controller 43 receives economizer inlet dissolved oxygen content monitor signal a and aeration device oxygen-adding amount signal b, gives highly pressurised liquid volume pump 42 according to steering logic output flow steering order, and highly pressurised liquid volume pump 42 is regulated flow output automatically.
The highly pressurised liquid volume pump is a lot of at present, can adopt ram pump, and operating pressure is for example selected about 35MPa, and flow is selected for example about 250ml/min.Highly pressurised liquid volume pump 42 can be set top hole pressure, and flow is adjustable continuously, and flow control accuracy can reach about 2%F.S..Container for storing liquid 41 can be furnished with agitator 49 (for example electric mixer), and the material of agitator 49 impellers and axle can be stainless steel.Agitator 49 can be realized regularly start and stop, and the start-stop time can be set, agitator 49 adjustable-speed.Container for storing liquid 41 favorable sealing properties, tank deck can be equipped with respiratory organ, and it is indoor to prevent that reductive agent from evaporateing into.Container for storing liquid 41 can adopt stainless steel.
According to one embodiment of present invention, between container for storing liquid 41 and highly pressurised liquid volume pump 42, be connected with strainer 48, the reductant solution that joins water feeding system through highly pressurised liquid volume pump 42 is filtered.Between the reductive agent adding point of highly pressurised liquid volume pump 42 and boi1er tube system, also be connected with surge tank 44, tensimeter 45, reducing valve 46, reverse checkvalve 47 and gate valve etc. in turn.
Fig. 5 illustrates the structure iron that high pressure of the present invention adds another embodiment of reductive agent complexes.In this embodiment, be example with two units, high pressure adds the reductive agent complexes and comprises 41,3 highly pressurised liquid volume pumps 42 of 2 container for storing liquids (is standby), automatic medicament feeding system 500 and controller 43.Automatic dispensation apparatus 500 links to each other with container for storing liquid 41, and being used for provides reductive agent strong solution and dilution water to form reductant solution to container for storing liquid 41.
Referring to Fig. 5, according to one embodiment of present invention, automatic dispensation apparatus 500 comprises successively the reductive agent bucket 51 that connects, gets liquid pump 53, reductive agent under meter 54 and gate valve 55,56, and gate valve 55 links to each other with container for storing liquid 41; Automatic dispensation apparatus 500 also comprises dilution water source 52, dilution water flow meter 59 and the dilution water gate valve 60 that connects successively, and dilution water gate valve 60 links to each other with container for storing liquid 41.The agitator 49 of container for storing liquid 41 can stir reductive agent strong solution and dilution water.Container for storing liquid 41 is equipped with liquidometer 50, is used for level monitoring, and liquid level shows on the spot and direct current signal output is arranged, has the hi-lo signal alarm function.Liquor box is provided with interfaces such as blowdown, water inlet, feed liquor, fluid.Container for storing liquid 41 outlets have motorized valve 58, and Shuttoff Valve when configuration solution is in order to avoid density unevenness exerts an influence to dosing.
In one embodiment, high pressure adds the reductive agent complexes and also comprises automated dispensing controller 57, links to each other with automatic dispensation apparatus 500, is used to provide the proportioning signal of reductive agent strong solution and dilution water.Automatic dispensation apparatus 500 is by 57 controls of automated dispensing controller, and the process of making up a prescription can be carried out automatically, also can manually carry out.The concentration of making up a prescription can be set, and according to set(ting)value, automated dispensing controller 57 sends instruction to motorized valve, and reductive agent strong solution and dilution water proportioning signal are provided, by reductive agent under meter 54 and dilution water flow meter 59 control strong solution and dilution water ratios.Automated dispensing controller 57 can be positioned on same the computing equipment with controller 43.
In Fig. 5, automatic dispensation apparatus is the complete automated dispensing system of a cover, can Long-distance Control move automatically, also can manually move.Container for storing liquid has 2, and during an operation, other one is made up a prescription, and the back of making up a prescription is standby.The highly pressurised liquid volume pump has 3,2 normal operations, and one is standby.Equipment such as whole system pipeline, valve adopt stainless steel, and voltage withstand class is chosen according to the highly pressurised liquid volume pump.The reduction dosage flow of control highly pressurised liquid volume pump makes economizer inlet dissolved oxygen content less than preset value, for example≤7 μ g/L; Service data stores statistics automatically, provides the service data curve.
According to one embodiment of present invention, can perhaps regulate the reductive agent add-on according to economizer enter the mouth dissolved oxygen content and feedwater flow Signal Regulation reductive agent add-on according to economizer inlet dissolved oxygen content and oxygenant add-on.Below with reference to Fig. 6 and Fig. 7 the control of reductive agent add-on is described.
Fig. 6 illustrates the schema that one embodiment of the present of invention middle controller is determined the reductive agent add-on.
As shown in Figure 6, step 602 is calculated the reducing agent filling amount according to economizer inlet dissolved oxygen content monitoring result and feedwater flow.
Step 606 judges whether economizer inlet dissolved oxygen satisfies preset value, if, then finish, otherwise, forward step 604 to and proceed reductive agent adding control.
Fig. 7 illustrates the schema that an alternative embodiment of the invention middle controller is determined the reductive agent add-on.
As shown in Figure 7, step 702 is calculated the reducing agent filling amount according to aeration device filling oxygen amount and economizer inlet dissolved oxygen content monitoring result.
Step 706 judges whether economizer inlet dissolved oxygen satisfies preset value, if, then finish, otherwise, forward step 704 to and proceed reductive agent adding control.
So far, described in detail, and the high pressure that is applied to method and system of the present invention adds the reductive agent complexes according to feedwater treatment method of the present invention and system.For fear of covering design of the present invention, details more known in the field are not described.Those skilled in the art can understand fully and how implement technical scheme disclosed herein according to top description.
Description of the invention provides for example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is for better explanation principle of the present invention and practical application, thereby and makes those of ordinary skill in the art can understand the various embodiment that have various modifications that the present invention's design is suitable for specific end use.
Claims (10)
1. thermal power generation unit feedwater treatment method is characterized in that this method comprises:
Add oxygenant before low pressure heater or/and before the high pressure heater;
Behind described high pressure heater, add reductive agent, make boiler systems stove oxygen in water concentration be lower than preset value;
Two kinds of feedwater treatment methods move simultaneously.
2. method according to claim 1 is characterized in that, the adding reductive agent comprises one or more in the following mode behind described high pressure heater:
Mode one, in described high pressure heater outlet back, on the economizer preceding pipeline, add described reductive agent;
Mode two, add described reductive agent at water wall lower collecting box place.
3. method according to claim 2 is characterized in that, also comprises:
Regulate described reductive agent add-on according to economizer inlet dissolved oxygen monitoring point signal and feedwater flow, perhaps regulate described reductive agent add-on according to economizer inlet dissolved oxygen content and described oxygenant add-on.
4. method according to claim 1 is characterized in that, adopts the high-pressure pump mode to inject described reductive agent behind described high pressure heater.
5. according to any described method in the claim 1 to 4, it is characterized in that the adding oxygenant comprises one or more in the following mode before low pressure heater or/and before the high pressure heater:
Mode one, mix the female pipe of a bed outlet place in the condensed water precision processing and add described oxygenant;
Mode two, add described oxygenant at the deoxygenator pipe place that falls in export;
Mode three, mix the female pipe of a bed outlet place in the condensed water precision processing and add described oxygenant, falling in export at deoxygenator, the pipe place is auxiliary to add described oxygenant.
6. according to any described method in the claim 1 to 3, it is characterized in that, make that dissolved oxygen concentration is 30-150 μ g/L in the water feeding system or/and add oxygenant before the described high pressure heater at described low pressure heater.
7. method according to claim 1 is characterized in that, described preset value is 7 μ g/L.
8. method according to claim 1 is characterized in that, described oxygenant is a pure oxygen, perhaps for comprising the mixed gas of oxygen.
9. method according to claim 1 is characterized in that, described reductive agent is a diamine.
10. method according to claim 9 is characterized in that, described reductive agent is the pure solution of diamine, or the solution of dilution.
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| CN 201110299982 CN102408148B (en) | 2011-09-28 | 2011-09-28 | Feed water treatment method of thermal generator set |
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| CN 201110299982 CN102408148B (en) | 2011-09-28 | 2011-09-28 | Feed water treatment method of thermal generator set |
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| CN103880230B (en) * | 2014-03-26 | 2015-04-08 | 西安热工研究院有限公司 | Segmental oxidation treatment system and treatment method of thermodynamic system of novel coal-fired power plant |
| CN104326547B (en) * | 2014-10-23 | 2015-12-09 | 国家电网公司 | A kind of coal unit Boiler High Pressure feeds water micro-oxygen accurate control method and device |
| CN109539234A (en) * | 2018-12-29 | 2019-03-29 | 西安热工研究院有限公司 | A kind of Boiler Steam reduction treatment system and method |
| CN110510723A (en) * | 2019-08-05 | 2019-11-29 | 安徽安庆皖江发电有限责任公司 | Thermal power generation unit |
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