CN114036756A - Method and device for evaluating furnace shutdown protection anti-corrosion effect of thermal power generating unit - Google Patents
Method and device for evaluating furnace shutdown protection anti-corrosion effect of thermal power generating unit Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 73
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- 238000011010 flushing procedure Methods 0.000 claims description 14
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 12
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Abstract
The method and the device for evaluating the furnace shutdown protection anti-corrosion effect of the thermal power generating unit are simple to operate and easy to implement, can effectively master the anti-corrosion condition in the pipeline of the water vapor system of the huge coal-fired boiler in the furnace shutdown protection state, and judge whether the currently adopted coal-fired boiler shutdown protection method is reliable and effective. A method for evaluating the furnace shutdown protection anti-corrosion effect of a thermal power generating unit comprises the following steps: measuring the accumulated flow of the outlet of the condensate pump at the starting stage of the unit; measuring the mass content of iron in water vapor related to the heating surface of the boiler in the starting stage of the unit, and calculating to obtain the average value of the iron content in the water vapor related to the heating surface of the corresponding boiler; calculating the total iron content of the unit in a starting stage according to the accumulated flow and the average value of the iron content by a preset total iron amount fitting mode; and (4) evaluating the furnace shutdown protection anti-corrosion effect of the unit before the unit is started by taking the total iron content as an evaluation index.
Description
Technical Field
The invention belongs to the technical field of boiler corrosion protection, and particularly relates to a method and a device for evaluating furnace shutdown protection anti-corrosion effect of a thermal power generating unit.
Background
In recent years, with the continuous input and operation of nuclear power, hydroelectric power, wind power and photovoltaic generator sets, the thermal power generating set strictly controls the operation time and faces longer and longer stop state or more and more start-stop times. Therefore, the anti-corrosion requirement on the shutdown protection of the coal-fired boiler of the thermal power generating unit is more and more strict, so that a great amount of corrosion of the coal-fired boiler during the shutdown period is prevented, the coal-fired boiler of the thermal power generating unit can be safely and reliably started at any time, the long-term normal safe and stable operation is kept, and accidents such as pipe explosion and the like of the coal-fired boiler in the operation process caused by the shutdown corrosion are avoided.
At present, a coal-fired boiler shutdown protection anti-corrosion method for a thermal power generating unit has more records in relevant standards, but no evaluation method for the coal-fired boiler shutdown protection anti-corrosion effect exists, so that the shutdown protection anti-corrosion effect of the coal-fired boiler cannot be evaluated, the anti-corrosion condition of a huge coal-fired boiler water vapor system in a shutdown protection state cannot be mastered, whether the adopted coal-fired boiler shutdown protection method is reliable and effective cannot be represented, and potential safety hazards under pipe explosion and pipe burying occur in subsequent operation due to improper shutdown protection of the coal-fired boiler.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the method and the device for evaluating the furnace shutdown protection anti-corrosion effect of the thermal power generating unit, which are simple to operate and easy to implement, can effectively master the anti-corrosion condition in the steam system pipeline of the huge coal-fired boiler in the furnace shutdown protection state, and judge whether the currently adopted coal-fired boiler shutdown protection method is reliable and effective.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for evaluating the furnace shutdown protection anti-corrosion effect of a thermal power generating unit comprises the following steps:
measuring the accumulated flow of the outlet of the condensate pump at the starting stage of the unit;
measuring the mass content of iron in water vapor related to the heating surface of the boiler in the starting stage of the unit, and calculating to obtain the average value of the iron content in the water vapor related to the heating surface of the corresponding boiler;
calculating the total iron content of the unit in a starting stage according to the accumulated flow and the average value of the iron content by a preset total iron amount fitting mode;
and (4) evaluating the furnace shutdown protection anti-corrosion effect of the unit before the unit is started by taking the total iron content as an evaluation index.
Preferably, the measurement unit is used for measuring the accumulated flow at the outlet of the condensate pump in the starting stage of the unit, including,
measuring a first accumulated flow of the unit from the start of the condensate pump after stable operation to the end of thermal state flushing;
and measuring a second accumulated flow of the unit from the beginning of the turbine running to the stage of grid connection of the steam turbine generator unit.
Preferably, the iron content in the water vapor related to the heating surface of the boiler in the starting stage of the unit is measured, and the iron content comprises the iron content of condensed water, the iron content of feed water, the iron content of furnace water or outlet water of a starting separator and the iron content of superheated steam.
Preferably, the calculating the average value of the iron content in the water vapor related to the heating surface of the boiler comprises calculating the average value of the iron content according to the iron content in the water vapor related to the heating surface of the boiler in the detection period.
Preferably, the preset total iron amount is fit to:
Mtotal iron content＝VAt the end of the hot rinsing×cAverage value of iron content in condensed water+VAt the end of the hot rinsing×cAverage value of iron content of feed water+VAt the end of the hot rinsing×cAverage value of iron content in furnace water or discharged water of starting separator+VFrom the steam turbine stage to the grid connection×cAverage iron content of superheated steam；
Wherein M isTotal iron contentIs the total iron content, V, of the unit at start-upAt the end of the hot rinsingA first accumulated flow V of the unit from the start of the condensate pump during stable operation to the end of the hot-state flushingDuring the steam turbine rush-to-run stage to the grid connectionFor the second cumulative flow of the unit from the start of the turbine turn-around to the stage of grid connection of the turbo-generator unit,
caverage value of iron content in condensed waterAs mean value of the iron content of the condensate, cAverage value of iron content of feed waterAs average value of iron content of feed water, cAverage value of iron content in furnace water or discharged water of starting separatorIs the average value of iron content of furnace water or discharged water of a start separator, cAverage iron content of superheated steamThe average value of the iron content of the superheated steam is shown.
Preferably, the method further comprises the steps of adding ammonia into the condensed water and adding ammonia into the water in the starting stage.
The utility model provides an evaluation device of rust-resistant effect of losing of thermal power unit blowing out protection, includes:
the accumulated flow measurement module is used for measuring the accumulated flow of the outlet of the condensate pump in the starting stage of the unit;
the iron content measuring module is used for measuring the mass content of iron in water vapor related to the heating surface of the boiler in the starting stage of the unit;
the calculation unit is used for calculating and obtaining the average value of the iron content in the related water vapor of the heating surface of the corresponding boiler;
the total iron content calculation module is used for calculating the total iron content of the unit in a starting stage according to the cumulative flow and the average value of the iron content by a preset total iron amount fitting mode;
and the evaluation module is used for evaluating the furnace shutdown protection anti-corrosion effect of the unit before the unit is started at the time by taking the total iron content as an evaluation index.
Preferably, the cumulative flow rate measurement module includes:
the first-stage measuring module is used for measuring a first accumulated flow of the unit from the start of the condensate pump after stable operation to the end of thermal state flushing;
and the second stage measuring module is used for measuring a second accumulated flow of the unit from the beginning of the turbine turning to the stage of grid connection of the turbo generator unit.
Preferably, the iron content measuring module includes:
the first measuring module is used for measuring the iron content of the condensed water;
the second measurement module is used for measuring the content of the iron in the feed water;
the third measuring module is used for measuring the iron content of furnace water or water discharged by a starting separator;
and the fourth measuring module is used for measuring the iron content of the superheated steam.
Preferably, the system also comprises a condensed water ammonia adding device and a water supply ammonia adding device.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a method and a device for evaluating the anti-corrosion effect of the shutdown protection of a thermal power generating unit, which can evaluate the anti-corrosion protection effect of a starting unit after any one shutdown protection method is selected to protect the unit for a period of time, and have wide application range; the method has the advantages that the corresponding total iron content in the system is obtained by measuring and starting the accumulated flow of each stage and the iron content of each water vapor system of the main heating surface of the coal-fired boiler and fitting and calculating, the corrosion prevention condition of the shutdown protection of each water vapor system of the coal-fired boiler is effectively represented, the data accuracy is high, the result is visual and clear, the device is simple in structure and easy to operate and implement, the corrosion prevention condition in the huge coal-fired boiler water vapor system pipeline in the shutdown protection state can be effectively mastered through the total iron content, whether the currently adopted coal-fired boiler shutdown protection method is reliable and effective or not is judged, and potential safety hazards caused by the shutdown corrosion of the coal-fired boiler are avoided.
The method can ensure that the pH value of the feed water is controlled in a proper range, namely the conductivity is controlled in a preferred range by performing the condensation water ammoniating and the feed water ammoniating at any time in the starting stage and not running any fine treatment equipment in the starting process of the unit, can unify and standardize the precondition for the regulation of the water vapor control and the fine treatment equipment by adding the chemicals in the starting process, is convenient for performing transverse comparison on the anti-rust effect of each coal-fired boiler shutdown protection method and each coal-fired boiler shutdown protection, can compare and observe the change of the anti-rust effect of the same protection method along with the change of the shutdown time, and judge the cruising ability of the protection; the protection effect of different protection methods in the same shutdown time can be compared, so that a better protection scheme can be selected, the protection methods can be further optimized, and the practicability is high.
Drawings
FIG. 1 is a process flow diagram of an evaluation apparatus according to the present invention;
FIG. 2 is a flow chart of the evaluation method of the present invention;
FIG. 3 is a flow chart of an embodiment of the evaluation method of the present invention.
In the figure, a selection module 100, an accumulative flow rate measurement module 110, a first stage measurement module 111, a second stage measurement module 112, an iron content measurement module 120, a first measurement module 121, a second measurement module 122, a third measurement module 123, a fourth measurement module 124, a total iron content calculation module 130, and an evaluation module 140 are shown.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention provides a method and a device for evaluating furnace shutdown protection anti-corrosion effect of a thermal power generating unit according to detection data analysis and experimental research results of steam quality in a cold-state starting process of the thermal power generating unit, wherein the monitoring and control method comprises the following steps: the total iron content in the water vapor of each heating surface at the starting stage of the coal-fired boiler of the thermal power generating unit is adopted to represent the anti-corrosion effect of the shutdown protection of the coal-fired boiler, and the lower the total iron content is, the better the anti-corrosion effect of the shutdown protection of the coal-fired boiler is.
Specifically, as shown in fig. 2, a method for evaluating furnace shutdown protection anti-corrosion effect of a thermal power generating unit includes:
before evaluation, selecting any one furnace shutdown protection method to protect the unit for preset furnace shutdown time;
measuring the accumulated flow of the outlet of the condensate pump at the starting stage of the unit;
measuring the mass content of iron in water vapor related to the heating surface of the boiler in the starting stage of the unit, and calculating to obtain the average value of the iron content in the water vapor related to the heating surface of the corresponding boiler;
calculating the total iron content of the unit in a starting stage according to the accumulated flow and the average value of the iron content by a preset total iron amount fitting mode;
and evaluating the furnace shutdown protection anti-corrosion effect of the unit before the start by taking the total iron content as an evaluation index, wherein the higher the total iron content is, the worse the anti-corrosion effect of the furnace shutdown protection method is.
The invention provides a method and a device for evaluating the anti-corrosion effect of the shutdown protection of a thermal power generating unit, which can evaluate the anti-corrosion protection effect of a starting unit after any one shutdown protection method is selected to protect the unit for a period of time, and have wide application range; the method has the advantages that the corresponding total iron content in the system is obtained by measuring and starting the accumulated flow of each stage and the iron content of each water vapor system of the main heating surface of the coal-fired boiler and fitting and calculating, the corrosion prevention condition of the shutdown protection of each water vapor system of the coal-fired boiler is effectively represented, the data accuracy is high, the result is visual and clear, the device is simple in structure and easy to operate and implement, the corrosion prevention condition in the huge coal-fired boiler water vapor system pipeline in the shutdown protection state can be effectively mastered through the total iron content, whether the currently adopted coal-fired boiler shutdown protection method is reliable and effective or not is judged, and potential safety hazards caused by the shutdown corrosion of the coal-fired boiler are avoided.
As shown in fig. 3, further, the cumulative flow rate at the outlet of the condensate pump is measured during the startup phase of the unit, including,
measuring a first accumulated flow of the unit from the start of the condensate pump after stable operation to the end of thermal state flushing;
and measuring a second accumulated flow of the unit from the beginning of the turbine running to the stage of grid connection of the steam turbine generator unit.
Specifically, the hot state wash ends at the same time as the turbine start of the turbine.
Further, measuring the iron content in the water vapor related to the heating surface of the boiler in the starting stage of the unit, including,
the iron content of the condensed water, the iron content of the feed water, the iron content of the furnace water or the outlet water of the start-up separator and the iron content of the superheated steam.
Further, measuring the average value of the iron content in the water vapor related to the heating surface of the boiler in the starting stage of the unit comprises calculating the arithmetic average value of the iron content according to the iron content in the water vapor related to the heating surface of the boiler in the detection period.
In a preferred embodiment, the detection period may be 1 hour, 2 hours or 3 hours, and is determined according to actual conditions.
Specifically, the method comprises the average value of the iron content of the condensed water, the average value of the iron content of the feed water, the average value of the iron content of the outlet water of the furnace water or the start-up separator and the average value of the iron content of the superheated steam.
Further, the preset total iron amount is fit as follows:
Mtotal iron content＝VAt the end of the hot rinsing×cAverage value of iron content in condensed water+VAt the end of the hot rinsing×cAverage value of iron content of feed water+VAt the end of the hot rinsing×cAverage value of iron content in furnace water or discharged water of starting separator+VDuring the steam turbine rush-to-run stage to the grid connection×cAverage iron content of superheated steam；
Wherein M isTotal iron contentIs the total iron content, V, of the unit at start-upAt the end of the hot rinsingA first accumulated flow V of the unit from the start of the condensate pump during stable operation to the end of the hot-state flushingDuring the steam turbine rush-to-run stage to the grid connectionStarting the turbine to the turbo-generator set for the set andthe second cumulative flow at this stage of the network,
caverage value of iron content in condensed waterAs mean value of the iron content of the condensate, cAverage value of iron content of feed waterAs average value of iron content of feed water, cAverage value of iron content in furnace water or discharged water of starting separatorIs the average value of iron content of furnace water or discharged water of a start separator, cAverage iron content of superheated steamThe average value of the iron content of the superheated steam is shown.
Further, the method also comprises the steps of adding ammonia into the condensed water and adding ammonia into the water in the starting stage.
The method can ensure that the pH value of the feed water is controlled to be 9.5 +/-0.1 by performing the condensation water ammonia addition and the feed water ammonia addition at any time at the starting stage, namely the conductivity is controlled to be within the range of 6.8 mu S/cm-10.8 mu S/cm without operating any fine treatment equipment in the starting process of the unit, can unify and standardize the precondition for the regulation of the water vapor control and the fine treatment equipment by adding the water in the starting process, is convenient for performing transverse comparison on the anti-corrosion effect of each coal-fired boiler shutdown protection method and each coal-fired boiler shutdown protection, and can judge the protective cruising ability of the same protection method along with the change of the shutdown time and the change of the anti-corrosion effect; the protection effect of different protection methods in the same shutdown time can be compared, so that a better protection scheme can be selected, the protection methods can be further optimized, and the practicability is high.
As shown in fig. 1, an evaluation apparatus for furnace shutdown protection and corrosion prevention effect of a thermal power generating unit includes:
the selection module 100 is used for selecting any one of the blowing-out protection methods to protect the unit for the preset blowing-out time before evaluation;
an accumulated flow measurement module 110, configured to measure an accumulated flow at an outlet of the condensate pump at a start-up stage of the unit;
the iron content measuring module 120 is used for measuring the mass content of iron in water vapor related to the heating surface of the boiler in the starting stage of the unit;
the calculation unit is used for calculating and obtaining the average value of the iron content in the related water vapor of the heating surface of the corresponding boiler;
the total iron content calculation module 130 is configured to calculate the total iron content of the unit in the starting stage according to the cumulative flow and the average value of the iron content by a preset total iron fit-up formula;
and the evaluation module 140 is used for evaluating the furnace shutdown protection anti-corrosion effect of the unit before the unit is started by taking the total iron content as an evaluation index.
Further, the cumulative flow measurement module 110 includes:
the first-stage measuring module 111 is used for measuring a first accumulated flow of the unit from the start of the condensate pump after stable operation to the end of thermal state flushing;
and the second stage measuring module 112 is used for measuring a second accumulated flow of the unit from the beginning of the turbine turning to the stage of grid connection of the steam turbine generator unit.
Further, the iron content measurement module 120 includes:
a first measuring module 121, configured to measure the iron content of the condensed water;
a second measuring module 122 for measuring the iron content of the feed water;
the third measuring module 123 is used for measuring the iron content of the furnace water or the outlet water of the starting separator;
and a fourth measuring module 124 for measuring the iron content of the superheated steam.
Further, the calculation unit is also used for calculating the arithmetic mean value of the iron content according to the iron content in the water vapor related to the heating surface of the boiler in the detection period.
Further, the system also comprises a condensed water ammonia adding device and a water supply ammonia adding device which are put into operation.
The method specifically quantifies the evaluation of the anti-rust effect of the shutdown protection of the coal-fired boiler of the thermal power generating unit, can adopt the finally obtained specific data of the total iron content to compare the anti-rust effect of the shutdown protection of the thermal power generating unit with the anti-rust effect of the shutdown protection of the thermal power generating unit, can also be used for comparing the anti-rust effect of the shutdown protection under different shutdown protection methods, and can also be used for comparing the anti-rust effect of the shutdown protection under the same type of thermal power generating unit, and is an evaluation method capable of directly comparing data; in addition, the invention has more definite and specific requirements and monitoring on the supervision of the water vapor quality in the starting process of the unit, and can be followed and relied.
Example 1:
in this embodiment 1, a supercritical 660MW dc furnace is selected to perform shutdown protection, and the shutdown protection method of the coal-fired boiler is implemented by increasing the pH of feed water. In a certain starting process, the evaluation method and the evaluation device are adopted to evaluate the coal-fired boiler shutdown protection anti-corrosion effect under different shutdown protection times, and the specific steps are as follows:
in the starting process, the high-speed mixed bed is not put into operation without the fine treatment of the unit, and condensed water ammonia adding equipment and water supply ammonia adding equipment are put into operation to control the pH value of water supply to be maintained between 9.5 +/-0.1 and the conductivity to be controlled between 7.0 mu S/cm and 10.0 mu S/cm;
in the whole starting stage process from cold day washing to unit grid connection, sampling and detecting indexes such as iron content in each water vapor water sample every 2 hours and at the time of ignition, flushing and important nodes of grid connection;
and reading and recording the accumulated flow of the condensed water according to an accumulated flow meter arranged at the outlet of the condensed water pump until the unit is connected to the grid.
The first-time unit is restarted after the shutdown protection for 170 days, and the measurement results obtained by the evaluation method are as follows:
when the hot state washing is finished, the accumulated flow of the outlet of the condensate pump is 9014 t;
the average value of the iron content of the condensed water is 111.8 mug/L;
the average value of the iron content of the feed water is 82 mug/L;
starting the separator to discharge water with the average iron content of 102.1 mug/L;
when the steam turbine is in a flushing stage and is connected to the grid, the accumulated flow of the outlet of the condensate pump is 3765 t;
the average value of the iron content of the superheated steam is 30.3 mug/L;
the total iron content was calculated to be 2781.3kg according to the fit equation provided by the present invention.
The second-time unit is restarted after 8 days of furnace shutdown protection, and the measurement results obtained by the evaluation method are as follows:
when the hot state washing is finished, the accumulated flow of the outlet of the condensate pump is 7514 t;
the average value of the iron content of the condensed water is 24 mug/L;
the average value of the iron content of the feed water is 9.5 mug/L;
starting the separator to discharge water with the average value of iron content of 12.5 mug/L;
when the steam turbine is in the flushing stage and is connected to the grid, the accumulated flow of the outlet of the condensate pump is 5327 t;
the average value of the iron content of the superheated steam is 5.5 mug/L;
the total iron content was found to be 375.0kg by calculation according to the fit equation provided by the present invention.
According to the evaluation result, it can be observed that the corrosion amount of the unit in the long-time furnace shutdown time is obviously higher than that in the short furnace shutdown time, which shows that the method can more intuitively know the anti-corrosion effect of the shutdown protection, and the method for the furnace shutdown protection can be improved accordingly.
Example 2:
in an ultra-supercritical 660MW direct-current boiler in China, nitrogen gas filling protection and feed water pH value increasing protection are respectively adopted in two boiler shutdowns of a coal-fired boiler in front and back. In the starting process after two times of shutdown protection, the method is adopted to evaluate the shutdown protection anti-corrosion effect of the coal-fired boiler: in the starting process, the high-speed mixed bed is not put into operation without the fine treatment of the unit, the condensed water ammonia adding equipment and the water supply ammonia adding equipment are put into operation, the pH value of the water supply is controlled to be 9.5 +/-0.1, and the conductivity is controlled to be 7.0 mu S/cm-10.0 mu S/cm; in the process from cold day washing to unit grid connection, sampling and detecting indexes such as iron content in each water vapor water sample every 2 hours and at the time of ignition, washing and grid connection important nodes, and simultaneously recording the accumulated flow of condensed water until the unit grid connection.
Adopting a nitrogen filling protection method: the unit starts the process after about 179 days of furnace shutdown protection: when the hot state washing is finished, the accumulated flow of the outlet of the condensate pump is 8173t, the average value of the iron content of the condensate water is 86.9 mug/L, the average value of the iron content of the feed water is 71.3 mug/L, and the average value of the iron content of the outlet water of the separator is 80.9 mug/L; when the steam turbine is in a flushing stage and is connected to the grid, the accumulated flow of the outlet of the condensate pump is 3019t, and the average value of the iron content of the superheated steam is 26.1 mug/L. The total iron content was 2033.0kg according to the fit proposed in the method.
The protection method for improving the pH value of the feed water is adopted: the starting process of the unit after 170 days of furnace shutdown protection: when the hot state washing is finished, the accumulated flow of the outlet of the condensate pump is 9014t, the average value of the iron content of the condensate water is 111.8 mug/L, the average value of the iron content of the feed water is 82 mug/L, and the average value of the iron content of the outlet water of the separator is started to be 102.1 mug/L; when the steam turbine is in the flushing stage and is connected to the grid, the accumulated flow of the outlet of the condensate pump is 3765t, and the average value of the iron content of the superheated steam is 30.3 mug/L. The total iron content was 2781.3kg according to the fit proposed in the method.
According to the evaluation result, it can be observed that obviously, the corrosion amount of the same unit adopting the nitrogen-filled blowing-out protection method in the same blowing-out time is less than that of the blowing-out protection method for increasing the water supply pH value, which means that the nitrogen-filled blowing-out protection method has better rust prevention effect on blowing-out protection.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the present invention shall be covered thereby.
Claims (10)
1. A method for evaluating the furnace shutdown protection anti-corrosion effect of a thermal power generating unit is characterized by comprising the following steps:
measuring the accumulated flow of the outlet of the condensate pump at the starting stage of the unit;
measuring the mass content of iron in water vapor related to the heating surface of the boiler in the starting stage of the unit, and calculating to obtain the average value of the iron content in the water vapor related to the heating surface of the corresponding boiler;
calculating the total iron content of the unit in a starting stage according to the accumulated flow and the average value of the iron content by a preset total iron amount fitting mode;
and (4) evaluating the furnace shutdown protection anti-corrosion effect of the unit before the unit is started by taking the total iron content as an evaluation index.
2. The method for evaluating the furnace shutdown protection anti-corrosion effect of the thermal power generating unit according to claim 1, wherein the step of measuring the accumulated flow of the outlet of the condensate pump at the starting stage of the thermal power generating unit comprises the steps of,
measuring a first accumulated flow of the unit from the start of the condensate pump after stable operation to the end of thermal state flushing;
and measuring a second accumulated flow of the unit from the beginning of the turbine running to the stage of grid connection of the steam turbine generator unit.
3. The method for evaluating the furnace shutdown protection anti-rust effect of the thermal power generating unit as claimed in claim 1, wherein the iron content in the water vapor related to the heating surface of the boiler in the unit startup stage is measured, and the iron content comprises the iron content of condensed water, the iron content of feed water, the iron content of furnace water or discharged water of a startup separator, and the iron content of superheated steam.
4. The method for evaluating the furnace shutdown protection and anti-corrosion effect of the thermal power generating unit as claimed in claim 1, wherein the calculating of the average value of the iron content in the water vapor related to the heating surface of the boiler comprises calculating the average value of the iron content according to the iron content in the water vapor related to the heating surface of the boiler in a detection period.
5. The method for evaluating the furnace shutdown protection anti-rust effect of the thermal power generating unit according to claim 1, wherein the preset total iron amount is fit to:
Mtotal iron content＝VAt the end of the hot rinsing×cAverage condensate content+VAt the end of the hot rinsing×cMean value of iron content of feed water+VAt the end of the hot rinsing×cAverage value of iron content in furnace water or discharged water of starting separator+VDuring the steam turbine rush-to-run stage to the grid connection×cAverage iron content of superheated steamValue of；
Wherein M isTotal iron contentIs the total iron content, V, of the unit at start-upAt the end of the hot rinsingA first accumulated flow V of the unit from the start of the condensate pump during stable operation to the end of the hot-state flushingDuring the steam turbine rush-to-run stage to the grid connectionFor the second cumulative flow of the unit from the start of the turbine turn-around to the stage of grid connection of the turbo-generator unit,
caverage value of iron content in condensed waterAs mean value of the iron content of the condensate, cAverage value of iron content of feed waterAs average value of iron content of feed water, cAverage value of iron content in furnace water or discharged water of starting separatorIs the average value of iron content of furnace water or discharged water of a start separator, cAverage iron content of superheated steamThe average value of the iron content of the superheated steam is shown.
6. The method for evaluating the furnace shutdown protection and corrosion prevention effect of the thermal power generating unit according to claim 1, characterized by further comprising the steps of adding ammonia to the condensed water and adding ammonia to the water during the startup phase.
7. An evaluation device for the furnace shutdown protection anti-corrosion effect of a thermal power generating unit, which is characterized in that based on the evaluation method of any one of the claims 1 to 6, the evaluation device comprises:
the accumulated flow measurement module (110) is used for measuring the accumulated flow of the outlet of the condensate pump in the starting stage of the unit;
the iron content measuring module (120) is used for measuring the mass content of iron in water vapor related to the heating surface of the boiler in the starting stage of the unit;
the calculation unit is used for calculating and obtaining the average value of the iron content in the related water vapor of the heating surface of the corresponding boiler;
the total iron content calculation module (130) is used for calculating the total iron content of the unit in a starting stage according to the cumulative flow and the average value of the iron content by a preset total iron content fitting mode;
and the evaluation module (140) is used for evaluating the furnace shutdown protection anti-corrosion effect of the unit before the start of the unit by taking the total iron content as an evaluation index.
8. The device for evaluating the furnace shutdown protection anti-corrosion effect of the thermal power generating unit according to claim 7, wherein the cumulative flow measurement module (110) comprises:
the first-stage measuring module (111) is used for measuring a first accumulated flow of the unit from the start of the condensate pump after stable operation to the end of thermal state flushing;
and the second stage measuring module (112) is used for measuring a second accumulated flow of the unit from the beginning of the turbine turning to the stage of grid connection of the steam turbine generator unit.
9. The device for evaluating the furnace shutdown protection anti-corrosion effect of the thermal power generating unit according to claim 7, wherein the iron content measuring module (120) comprises:
a first measuring module (121) for measuring the iron content of the condensed water;
a second measuring module (122) for measuring the feed water iron content;
the third measuring module (123) is used for measuring the iron content of furnace water or water discharged by a starting separator;
and the fourth measuring module (124) is used for measuring the iron content of the superheated steam.
10. The thermal power generating unit furnace shutdown protection anti-rust effect evaluation device according to claim 7, characterized by further comprising condensed water ammonia adding equipment and feedwater ammonia adding equipment.
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| PCT/CN2022/129680 WO2023083099A1 (en) | 2021-11-10 | 2022-11-03 | Method and apparatus for assessing boiler lay-up protection anti-corrosion effect of thermal power unit |
| JP2023551118A JP2024507274A (en) | 2021-11-10 | 2022-11-03 | Method and device for evaluating the corrosion prevention effect of boiler outage protection for thermal power generation units |
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