CN116585919A - Full-protection oxygenation conversion method for water vapor system - Google Patents
Full-protection oxygenation conversion method for water vapor system Download PDFInfo
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- CN116585919A CN116585919A CN202310376977.2A CN202310376977A CN116585919A CN 116585919 A CN116585919 A CN 116585919A CN 202310376977 A CN202310376977 A CN 202310376977A CN 116585919 A CN116585919 A CN 116585919A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 157
- 238000006213 oxygenation reaction Methods 0.000 title claims abstract description 103
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000001301 oxygen Substances 0.000 claims abstract description 165
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 165
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 163
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 70
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000001257 hydrogen Substances 0.000 claims abstract description 44
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 44
- 229910052742 iron Inorganic materials 0.000 claims abstract description 35
- 238000002161 passivation Methods 0.000 claims abstract description 21
- 238000012544 monitoring process Methods 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 230000002209 hydrophobic effect Effects 0.000 abstract description 12
- 238000005260 corrosion Methods 0.000 description 11
- 230000007797 corrosion Effects 0.000 description 8
- 230000001276 controlling effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000000630 rising effect Effects 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000005871 repellent Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 150000001450 anions Chemical class 0.000 description 2
- 238000005536 corrosion prevention Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000036284 oxygen consumption Effects 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/237—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media
- B01F23/2376—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media characterised by the gas being introduced
- B01F23/23761—Aerating, i.e. introducing oxygen containing gas in liquids
- B01F23/237611—Air
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/237—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media
- B01F23/2376—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media characterised by the gas being introduced
- B01F23/23761—Aerating, i.e. introducing oxygen containing gas in liquids
- B01F23/237612—Oxygen
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/40—Mixing liquids with liquids; Emulsifying
- B01F23/405—Methods of mixing liquids with liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/40—Mixing liquids with liquids; Emulsifying
- B01F23/48—Mixing liquids with liquids; Emulsifying characterised by the nature of the liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/21—Measuring
- B01F35/213—Measuring of the properties of the mixtures, e.g. temperature, density or colour
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/21—Measuring
- B01F35/2132—Concentration, pH, pOH, p(ION) or oxygen-demand
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/21—Measuring
- B01F35/2133—Electrical conductivity or dielectric constant of the mixture
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/80—Forming a predetermined ratio of the substances to be mixed
- B01F35/82—Forming a predetermined ratio of the substances to be mixed by adding a material to be mixed to a mixture in response to a detected feature, e.g. density, radioactivity, consumed power or colour
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Abstract
The invention provides a full-protection oxygenation conversion method for a water vapor system, and relates to the field of oxygenation conversion of water vapor systems. The method comprises the following steps: adding oxygen to water at the outlet of the deaerator, monitoring whether the dissolved oxygen, the iron content and the hydrogen conductivity at the inlet of the economizer reach a first preset condition, and if so, switching to a conventional water-supply oxygen adding mode; adding oxygen to condensate water at a condensate water fine treatment outlet, monitoring whether the dissolved oxygen, the iron content and the hydrogen conductivity at an inlet of a deaerator reach a second preset condition, and if so, switching to a condensate water conventional oxygenation mode; and (3) adding oxygen to the steam side of the high-pressure heater, monitoring whether the high-water-adding hydrophobic dissolved oxygen, the iron content and the hydrogen conductivity reach a third preset condition, and if so, switching to a high-water-adding hydrophobic conventional oxygen adding mode. The method can implement full-system oxygenation on the water vapor system, accurately judge the passivation completion time of each system by monitoring the dissolved oxygen, the iron content and the hydrogen conductivity of key positions, timely convert the oxygenation mode and have high oxygenation precision.
Description
Technical Field
The invention relates to the technical field of oxygenation conversion of a water vapor system, in particular to a full-protection oxygenation conversion method of a water vapor system.
Background
In the prior art, in order to realize comprehensive corrosion prevention of the water vapor system, oxygen is added to condensate, water supply and high water adding drainage by a plurality of units respectively, however, in the initial stage of oxygen adding, namely in the oxygen adding conversion stage, the oxygen adding precision is lower, the protection effect on the water vapor system is poor, and the corrosion of the water vapor system is serious.
The invention patent (CN 104326547A) discloses a method for precisely controlling high-pressure water supply micro-oxygen of a coal-fired unit boiler, which comprises the steps of adding dissolved oxygen in front of an inlet of a steam water supply pump of a deaerator down tube, and specifically, in front of a sampling point of an oxygen dissolving meter at an outlet of the deaerator. Closing the deaerator exhaust valve. The oxygen dissolving amount of the outlet of the deaerator is controlled to be 30-50 mug/L in the early stage of conversion, the oxygen dissolving amount of the outlet of the deaerator is controlled to be 10-30 mug/L in the middle stage of conversion, and the oxygen dissolving amount of the inlet of the economizer is controlled to be 10-20 mug/L in the later stage of conversion. When the dissolved oxygen expression number of the inlet of the economizer is less than 60% of the dissolved oxygen expression number of the outlet of the deaerator, counting as the early conversion period; when the dissolved oxygen expression number of the inlet of the economizer is 60-70% of the dissolved oxygen expression number of the outlet of the deaerator, the method is counted as a middle conversion stage; when the dissolved oxygen representing number of the inlet of the economizer is more than 70% of that of the outlet of the deaerator, the later conversion period is counted, so that the flow acceleration corrosion of the water supply system is inhibited by the technical scheme.
However, the method compares the dissolved oxygen representation number of the inlet of the economizer with the dissolved oxygen representation number of the outlet of the deaerator to judge the stage of conversion, so that the conversion stage is inaccurate, the oxygenation precision is still lower, and the oxygenation corrosion protection effect still needs to be improved.
Disclosure of Invention
The invention aims to provide a full-protection oxygenation conversion method for a water vapor system, which aims to solve the technical problems of low oxygenation precision and poor anti-corrosion effect in oxygenation conversion of the water vapor system in the prior art.
The invention provides a full-protection oxygenation conversion method of a water vapor system, which comprises the following steps: adding oxygen to water at the outlet of the deaerator, monitoring whether the dissolved oxygen, iron content and hydrogen conductivity of the water at the inlet of the economizer reach a first preset condition, if so, completing passivation of the water supply system, and switching to a conventional water supply oxygenation mode; adding oxygen to condensate water at the condensate water refined treatment outlet, monitoring whether the dissolved oxygen, iron content and hydrogen conductivity of condensate water at the inlet of the deaerator reach second preset conditions, if yes, passivating the condensate water system, and switching to a condensate water conventional oxygenation mode; and (3) adding oxygen to the steam side of the high-pressure heater, monitoring whether the dissolved oxygen, the iron content and the hydrogen conductivity of the high-water-adding steam side reach a third preset condition, and if so, completing passivation of the high-water-adding steam side, and switching to a high-water-adding steam side conventional oxygen adding mode.
Further, when oxygen is added to the water supply at the outlet of the deaerator, the initial oxygen adding amount is 30-80 mug/L, and if the dissolved oxygen of the water supply in the preset time period is smaller than the preset value, the oxygen adding amount is reduced to 30-50 mug/L and the oxygen adding is continued.
Further, the preset time period is 12-18 days, and further, the preset time period is 15 days.
Further, when oxygen is added to the condensate water at the condensate water finishing outlet, the oxygen addition amount is 10-150 mug/L.
Further, when oxygen is added to the steam side of the high-pressure heater, the oxygen addition amount is 10 to 150. Mu.g/L.
Further, the first preset condition is: the dissolved oxygen of the economizer inlet feed water was increased to 10 μg/L and there was a continuing trend to increase with less than 3 μg/L iron content and hydrogen conductivity restored to before oxygenation.
Further, the second preset condition is: dissolved oxygen in the deaerator inlet condensate began to rise, the iron content was less than 3 μg/L and the hydrogen conductivity was restored to that before oxygenation.
Further, the third preset condition is: the dissolved oxygen with high water addition was increased to 10. Mu.g/L and there was a continuing trend to increase with iron levels less than 3. Mu.g/L and hydrogen conductivity restored to that before oxygen addition.
Further, when oxygen is added to the condensate water refined treatment outlet and oxygen is added to the steam side of the high-pressure heater, the opening of an exhaust valve of the deaerator is kept at 1% -5% by adjusting, and the dissolved oxygen at the deaerator outlet is controlled to be less than 7 mug/L.
Further, if the exhaust valve is a double-air exhaust valve, the double-air exhaust valve is regulated; if the exhaust valve is a condenser exhaust valve, adjusting the condenser exhaust valve; and if the exhaust valve comprises the air exhaust valve and the condenser exhaust valve, closing the condenser exhaust valve and adjusting the air exhaust valve.
Further, when oxygen is added to the steam side of the high-pressure heater, the operation exhaust valve of the high-pressure heater is controlled to be closed.
The full-protection oxygenation conversion method of the water vapor system provided by the invention has the following beneficial effects:
the method provided by the invention monitors the dissolved oxygen, iron content and hydrogen conductivity in water at three key positions of an inlet of an economizer, an inlet of the deaerator and high-water-adding drainage respectively so as to grasp the stage of oxygenation conversion of each system and timely convert to a conventional oxygenation mode when each system finishes passivation, so that oxygenation precision can be improved, the dissolved oxygen can directly reflect oxygen content in water, the iron content can directly reflect oxidation corrosion condition of the inner wall of each pipeline, and the hydrogen conductivity can reflect the sum of impurity anions released into water in an oxidation film passivation process.
In summary, the method provided by the invention not only can implement full-system oxygenation on the water vapor system, but also can accurately judge the passivation completion time of each system by monitoring the dissolved oxygen, the iron content and the hydrogen conductivity at key positions, and timely convert the oxygenation mode, thereby having high oxygenation precision and good oxygenation anti-corrosion protection effect on the thermodynamic equipment of the water vapor system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an application of the full protection oxygenation conversion method of a water vapor system provided by the invention;
FIG. 2 is a graph of dissolved oxygen and hydrogen conductivity of condensate at the inlet of a deaerator, using the water vapor system full protection oxygenation conversion method provided by the invention;
FIG. 3 is a graph of the conductivity of dissolved oxygen and hydrogen in the feed water at the economizer inlet using the water vapor system full protection oxygenation conversion method provided by the invention;
FIG. 4 is a graph of high-level hydrophobic dissolved oxygen and hydrogen conductivity for a full-protection oxygenation conversion process for a water vapor system employing the invention.
Reference numerals illustrate:
a 100-condenser; 200-low pressure heater; 300-deaerator; 400-high pressure heater; 500-economizer; 600-water cooling walls; 700—superheater; 810-a high pressure cylinder; 820-medium pressure cylinder; 830-low pressure cylinder; 900-reheater.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, the general operation of the unit is: the water supply enters a pipeline from the deaerator 300, flows under the drive of a water supply pump, passes through each stage of high-pressure heater 400, then reaches the economizer 500, then reaches the water-cooled wall 600, and under the heating of a boiler, the generated steam enters a steam system, the steam passes through the heater 700 and then drives the high-pressure cylinder 810 to work, then passes through the reheater 900 and then drives the medium-pressure cylinder 820 to work, and finally reaches the low-pressure cylinder 830 to drive the low-pressure cylinder 830 to work; steam extracted from the high-pressure cylinder 810 enters the primary high-pressure heater 410 and the secondary high-pressure heater 420 through the steam extraction pipeline, steam extracted from the medium-pressure cylinder 820 enters the tertiary high-pressure heater 430 through the steam extraction pipeline, and high-pressure drain water output by each stage of high-pressure heater 400 flows back to the deaerator 300 for circulation; steam flowing out of the low-pressure cylinder 830 enters the condenser 100, enters the fine treatment device under the drive of the condensate pump, and enters the deaerator 100 for circulation through the low-pressure heater 200 after being subjected to fine treatment. In the prior art, the dissolved oxygen representation number at the inlet of the economizer 500 is compared with the dissolved oxygen representation number at the outlet of the deaerator 100 to judge the conversion stage, which is not accurate enough, so that the oxygenation precision at the conversion stage is still lower, and therefore, the oxygenation anti-corrosion protection effect still needs to be improved.
The embodiment provides a full-protection oxygenation conversion method for a water vapor system, which aims to solve the problems existing in the prior art. As shown in fig. 1, a point B in fig. 1 shows the oxygenation point of the deaerator outlet, a point a shows the oxygenation point of the condensate polishing outlet, and a point C shows the oxygenation point of the high-pressure heater steam side. The full-protection oxygenation conversion method for the water vapor system provided by the embodiment comprises the following steps: adding oxygen to water at the outlet of the deaerator, monitoring whether the dissolved oxygen, iron content and hydrogen conductivity of the water at the inlet of the economizer reach a first preset condition, if so, completing passivation of the water supply system, and switching to a conventional water supply oxygenation mode; adding oxygen to condensate water at the condensate water refined treatment outlet, monitoring whether the dissolved oxygen, iron content and hydrogen conductivity of condensate water at the inlet of the deaerator reach second preset conditions, if yes, passivating the condensate water system, and switching to a condensate water conventional oxygenation mode; and (3) adding oxygen to the steam side of the high-pressure heater, monitoring whether the dissolved oxygen, the iron content and the hydrogen conductivity of the high-water-adding steam side reach a third preset condition, and if so, completing passivation of the high-water-adding steam side, and switching to a high-water-adding steam side conventional oxygen adding mode.
According to the full-protection oxygenation conversion method for the water vapor system, provided by the embodiment, the water supply of the deaerator outlet, the condensed water of the condensed water fine treatment outlet and the steam side oxygenation of the high-pressure heater are respectively subjected to full-protection oxygenation corrosion prevention of the whole water vapor system including the water supply system, the condensed water system and the high-oxygenation drainage system, dissolved oxygen, iron content and hydrogen conductivity in water are monitored at three key positions of the inlet of the deaerator and the high-oxygenation drainage system respectively so as to master the oxygenation conversion stage of each system, and the system is timely converted into a conventional oxygenation mode when passivation is completed, so that oxygenation precision can be improved, dissolved oxygen can directly reflect oxygen content in water, iron content can directly reflect oxidation corrosion conditions of inner walls of pipelines, and hydrogen conductivity can reflect the sum of impurity anions released into water in an oxidation film passivation process.
In summary, the method provided by the embodiment not only can implement full-system oxygenation on the water vapor system, but also can accurately judge the passivation completion time of each system by monitoring the dissolved oxygen, the iron content and the hydrogen conductivity of the key position, and timely convert the oxygenation mode, so that the oxygenation precision is high, and the oxygenation corrosion protection effect on the heating power equipment of the water vapor system is good.
More specifically, in this embodiment, as shown in FIG. 1, when oxygen is added to the feed water at the deaerator outlet, oxygen addition is performed downstream of the dissolved oxygen meter at the deaerator outlet.
Specifically, in this embodiment, when oxygen is added to the feed water at the outlet of the deaerator, the initial oxygen adding amount is 30-80 μg/L, and if the dissolved oxygen of the feed water in the preset time period is less than the preset value, the oxygen adding amount is reduced to 30-50 μg/L and oxygen is continuously added. Wherein the preset value is 8-12 mug/L, for example, 10 mug/L can be taken, and when the dissolved oxygen at the inlet of the economizer is less than 10 mug/L, the oxygen in the water supply is considered to be not found yet, but in order to avoid the oxygen in the steam system, the oxygen adding amount is reduced. The initial oxygen adding amount is larger, the passivation speed of the water supply system can be improved, and the possibility of oxygen seeing of the water-cooled wall and the steam system is small due to the large oxygen consumption; along with the passivation, the oxygen consumption of the water supply system is reduced, so that the oxygen adding amount is reduced, the water cooling wall and the steam system can be effectively prevented from being aerobic, the water cooling wall corrosion and the concentrated peeling of oxide skin of the steam system can be effectively avoided, and the safety of the unit is ensured.
Specifically, in this embodiment, the preset duration is 12 to 18 days, and further, the preset duration may be 15 days.
Specifically, in this example, when oxygen is added to the condensate water at the condensate polishing outlet, the oxygen addition amount is 10 to 150. Mu.g/L.
Specifically, in this example, when oxygen is added to the steam side of the high-pressure heater, the oxygen addition amount is 10 to 150. Mu.g/L.
Specifically, in this embodiment, the first preset condition is: the dissolved oxygen of the economizer inlet feed water was increased to 10 μg/L and there was a continuing trend to increase with less than 3 μg/L iron content and hydrogen conductivity restored to before oxygenation. That is, when the dissolved oxygen of the economizer inlet feed water rises to 10 mug/L and there is a continuing trend of rising, the iron content is less than 3 mug/L and the hydrogen conductivity is recovered to before oxygenation, it is judged that the passivation of the feed water system or the oxygenation conversion is completed, and the conventional oxygenation mode is changed into that the oxygenation amount is adjusted according to the feed water flow rate or the unit load, and specifically, the dissolved oxygen of the economizer inlet feed water is controlled to be kept at 10-30 mug/L.
Specifically, in this embodiment, the second preset condition is: dissolved oxygen in the deaerator inlet condensate began to rise, the iron content was less than 3 μg/L and the hydrogen conductivity was restored to that before oxygenation. Namely, when the dissolved oxygen of the condensed water at the inlet of the deaerator starts to rise, the iron content is less than 3 mug/L, and the hydrogen conductivity is restored to be before oxygenation, the passivation of the condensed water system or the completion of oxygenation conversion is judged, and the conventional oxygenation mode is changed into a conventional oxygenation mode, and specifically, the dissolved oxygen of the condensed water at the inlet of the deaerator is controlled to be kept at 10-150 mug/L.
Specifically, in this embodiment, the third preset condition is: the dissolved oxygen with high water addition was increased to 10. Mu.g/L and there was a continuing trend to increase with iron levels less than 3. Mu.g/L and hydrogen conductivity restored to that before oxygen addition. Namely, when the dissolved oxygen with high water addition is increased to 10 mug/L and the rising trend is continued, the iron content is less than 3 mug/L and the hydrogen conductivity is recovered to be before the oxygen addition, judging that the passivation of the high water addition system is finished or the oxygen addition conversion is finished, and switching to a conventional oxygen addition mode, specifically, controlling the dissolved oxygen with high water addition to be kept at 10-150 mug/L.
Specifically, in the embodiment, when oxygen is added to the condensate water at the condensate water fine treatment outlet and oxygen is added to the steam side of the high-pressure heater, the opening of the exhaust valve of the deaerator is kept at 1% -5% by adjusting, and the dissolved oxygen at the deaerator outlet is controlled to be less than 7 mug/L. The ideal state is that the dissolved oxygen in the water after the deaerator deoxidizes is zero, namely oxygen is completely not seen, and 7 mug/L is the upper limit value, so that the interference of the oxygen adding of the condensed water and the high-oxygen hydrophobic oxygen adding to the oxygen adding of the water is avoided. The opening degree of an exhaust valve of the deaerator is controlled to be 1% -5%, on one hand, oxygen in water vapor can be discharged, oxygen in water at an outlet of the deaerator is cleared, interference of condensed water oxygenation and high-oxygenation hydrophobic oxygenation on water supply oxygenation is avoided, namely, the dissolved oxygen content at the outlet of the deaerator can be effectively controlled, adverse influence of unstable dissolved oxygen content at the outlet of the deaerator on the control of dissolved oxygen at an inlet of the economizer is effectively avoided, and accordingly the control precision of water supply oxygenation can be improved; on the other hand, the deaerator exhaust valve is slightly opened, and the water vapor and heat loss is small. In actual operation, the flow state of vapor discharged by the deaerator exhaust valve can be intuitively observed according to experience, whether the opening of the deaerator exhaust valve is proper or not is judged, and the opening of the deaerator exhaust valve is regulated, and when the vapor of the deaerator exhaust valve is in a floating state, the opening of the deaerator exhaust valve is proper; when vapor of the deaerator exhaust valve assumes a discharge state, it is necessary to appropriately reduce the opening of the deaerator exhaust valve.
More specifically, if the exhaust valve of the deaerator is an empty valve, then the empty valve is regulated; if the exhaust valve is an exhaust valve of the condenser, the exhaust valve of the condenser is regulated, and certainly, the water vapor state cannot be intuitively observed at the moment, so that the dissolved oxygen in the deoxygenated water needs to be mastered, and the opening degree of the valve is regulated according to the mastered dissolved oxygen; if the exhaust valve comprises an empty exhaust valve and a condenser exhaust valve, the condenser exhaust valve is closed, and only the empty exhaust valve is regulated.
Specifically, in this embodiment, the exhaust valve is controlled to close when oxygen is added to the vapor side of the high-pressure heater. By the arrangement, the loss of oxygen added in the water-repellent process due to exhaust and the reduction of the concentration of the water-repellent ammonia due to exhaust are avoided, so that the flow acceleration corrosion of the high-addition water-repellent system is restrained, and the oxygen-addition conversion speed of the high-addition water-repellent system is accelerated.
Specifically, the oxygen-adding conversion can be operated according to the following flow:
(1) And (3) operating an oxygenation device, starting an automatic air supply system or an air source, sequentially opening related valves, and adding oxygen to the condensate water at the condensate water fine treatment outlet, the water supply at the deaerator outlet and the steam side of the No. 1 high-pressure heater. Controlling the oxygen adding amount of the condensed water to be 10-150 mug/L, the oxygen adding amount of the water supply to be 30-80 mug/L and the water high adding hydrophobic oxygen adding amount to be 10-150 mug/L. The initial oxygenation capacity is adjusted according to the unit load and the change of the water vapor quality, and particularly when the unit load is large, the initial oxygenation capacity of each system is larger.
Wherein, the oxygenation equipment can be a full-protection automatic oxygenation device, and the oxygenation medium is air; can be a liquid oxygenation device, and the oxygenation medium is oxygen-enriched water; the device can also be a pure oxygen adding device, and the oxygen adding medium is high-purity oxygen. The oxygenation medium of the high-water-adding and hydrophobic system is air or oxygen-enriched water, and desalted water added with ammonia can be also adopted to raise the pH value of the high-water-adding and hydrophobic system.
(2) According to the conversion progress and the requirement, adjusting the deaerator to the condenser exhaust valve or the deaerator air exhaust valve to slightly open; and closing the high-pressure heater to operate the steam-discharging primary and secondary door.
(3) And detecting and recording the hydrogen conductivity and the iron content of key sampling points such as a deaerator inlet, an economizer inlet, high-pressure water drainage and the like of the water vapor system.
(4) And recording dissolved oxygen at the inlet of the deaerator, controlling the dissolved oxygen at 10-150 mug/L after the dissolved oxygen at the inlet of the deaerator is monitored to start to rise, and finishing passivation of the condensate system when the iron content at the inlet of the deaerator is less than 3 mug/L and the hydrogen conductivity is restored to a lower level before oxygenation. Fig. 2 shows graphs of dissolved oxygen and hydrogen conductivity of condensed water at the inlet of a deaerator by using the full-protection oxygenation conversion method of the water vapor system provided by the embodiment, wherein the upper graph is a hydrogen conductivity graph, and the lower graph is a dissolved oxygen graph.
(5) The oxygen adding amount at the outlet of the deaerator is controlled to be 30-80 mug/L, and the deaerator is operated for 15 days, if the water is not supplied with oxygen, the oxygen adding amount is reduced to 30-50 mug/L for continuing to add oxygen in order to avoid the main steam with oxygen caused by the long-time high oxygen conversion of the water. When the dissolved oxygen at the inlet of the economizer is monitored to rise to 10 mug/L and has a continuous rising trend, controlling the dissolved oxygen at the inlet of the economizer to be 10-30 mug/L, and when the iron content at the inlet of the economizer is less than 3 mug/L and the hydrogen conductivity is recovered to a lower level before oxygenation, the passivation of the water supply system is completed. Fig. 3 shows a graph of dissolved oxygen and hydrogen conductivity of feed water at the inlet of an economizer using the full-protection oxygenation conversion method for a water vapor system provided by the present embodiment, wherein the upper curve is a hydrogen conductivity curve and the lower curve is a dissolved oxygen curve.
(6) And controlling the oxygen adding amount of the high-steam adding side to be 10-150 mug/L, when the rising of the high-steam adding hydrophobic dissolved oxygen to 10 mug/L is monitored and the rising trend is continued, controlling the high-steam adding hydrophobic dissolved oxygen to be 10-150 mug/L, and when the high-steam adding hydrophobic iron content is less than 3 mug/L and the hydrogen conductivity is recovered to a lower level before oxygen adding, completing passivation of the high-steam adding hydrophobic system. Fig. 4 shows a graph of high-level water-vapor system full-protection oxygenation conversion method and high-level water-addition-capacity dissolved oxygen and hydrogen conductivity, wherein the upper graph is a hydrogen conductivity graph and the lower graph is a dissolved oxygen graph.
All the oxygenation units close the high-oxygenation exhaust valve in normal operation, and open the high-oxygenation exhaust valve in the period of start-stop or water quality deterioration of the unit.
Finally, it is further noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to the embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A water vapor system full protection oxygenation conversion method, comprising:
adding oxygen to water at the outlet of the deaerator, monitoring whether the dissolved oxygen, iron content and hydrogen conductivity of the water at the inlet of the economizer reach a first preset condition, if so, completing passivation of the water supply system, and switching to a conventional water supply oxygenation mode;
adding oxygen to condensate water at the condensate water refined treatment outlet, monitoring whether the dissolved oxygen, iron content and hydrogen conductivity of condensate water at the inlet of the deaerator reach second preset conditions, if yes, passivating the condensate water system, and switching to a condensate water conventional oxygenation mode;
and (3) adding oxygen to the steam side of the high-pressure heater, monitoring whether the dissolved oxygen, the iron content and the hydrogen conductivity of the high-water-adding steam side reach a third preset condition, and if so, completing passivation of the high-water-adding steam side, and switching to a high-water-adding steam side conventional oxygen adding mode.
2. The water vapor system full protection oxygenation conversion method according to claim 1, wherein when the water is oxygenated to the outlet of the deaerator, the initial oxygenation amount is 30-80 μg/L, and if the dissolved oxygen of the water is less than a preset value within a preset period of time, the oxygenation amount is reduced to 30-50 μg/L and oxygenation is continued.
3. The method for full-protection oxygenation conversion of a water vapor system according to claim 1, wherein when the condensed water is oxygenated to the condensed water finishing outlet, the oxygenation amount is 10-150 μg/L.
4. The method for full protection oxygenation conversion of a water vapor system according to claim 1, wherein when oxygen is added to the vapor side of the high pressure heater, the oxygen addition amount is 10 to 150 μg/L.
5. The water vapor system full protection oxygenation conversion method of any of claims 1-4, wherein said first predetermined condition is: the dissolved oxygen of the economizer inlet feed water was increased to 10 μg/L and there was a continuing trend to increase with less than 3 μg/L iron content and hydrogen conductivity restored to before oxygenation.
6. The water vapor system full protection oxygenation conversion process of any of claims 1-4, wherein said second predetermined condition is: dissolved oxygen in the deaerator inlet condensate began to rise, the iron content was less than 3 μg/L and the hydrogen conductivity was restored to that before oxygenation.
7. The water vapor system full protection oxygenation conversion method of any of claims 1-4, wherein said third preset condition is: the dissolved oxygen with high water addition was increased to 10. Mu.g/L and there was a continuing trend to increase with iron levels less than 3. Mu.g/L and hydrogen conductivity restored to that before oxygen addition.
8. The full protection oxygenation conversion method of a water vapor system according to any one of claims 1-4, wherein when the condensed water is oxygenated to the condensed water fine treatment outlet and the oxygen is oxygenated to the steam side of the high-pressure heater, the opening of an exhaust valve of the deaerator is adjusted to be kept between 1% and 5%, and the dissolved oxygen at the deaerator outlet is controlled to be less than 7 mug/L.
9. The water vapor system full protection oxygenation conversion method of claim 8, wherein,
if the exhaust valve is an empty exhaust valve, the empty exhaust valve is regulated;
if the exhaust valve is a condenser exhaust valve, adjusting the condenser exhaust valve;
and if the exhaust valve comprises the air exhaust valve and the condenser exhaust valve, closing the condenser exhaust valve and adjusting the air exhaust valve.
10. The vapor system full protection oxygenation conversion process of any of claims 1-4, wherein the high pressure heater is controlled to operate with exhaust valve closure while the vapor side of the high pressure heater is being oxygenated.
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