WO2023083099A1 - Method and apparatus for assessing boiler lay-up protection anti-corrosion effect of thermal power unit - Google Patents

Method and apparatus for assessing boiler lay-up protection anti-corrosion effect of thermal power unit Download PDF

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WO2023083099A1
WO2023083099A1 PCT/CN2022/129680 CN2022129680W WO2023083099A1 WO 2023083099 A1 WO2023083099 A1 WO 2023083099A1 CN 2022129680 W CN2022129680 W CN 2022129680W WO 2023083099 A1 WO2023083099 A1 WO 2023083099A1
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iron content
unit
average value
boiler
water
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Chinese (zh)
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杨俊�
乔越
宋飞
舒进
王彤
曹松彦
贾若飞
刘炎伟
贾明祥
马珍珍
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西安热工研究院有限公司
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  • thermal power units have strictly controlled the operation time, and are facing longer and longer periods of outage or more and more times of start and stop. Therefore, the anti-corrosion requirements for the decommissioning protection of coal-fired boilers of thermal power units are becoming more and more stringent, so as to prevent a large amount of corrosion of coal-fired boilers during decommissioning, ensure that the coal-fired boilers of the units can be started safely and reliably at any time, and maintain long-term normal safety and stability operation, to avoid accidents such as pipe bursts during the operation of coal-fired boilers caused by out-of-service corrosion.
  • the embodiment of the present disclosure provides an evaluation method and device for the anti-corrosion effect of thermal power unit shutdown protection, which is simple to operate and easy to implement, and can effectively control the water vapor system of a huge coal-fired boiler under the shutdown protection state The anti-corrosion situation in the pipeline, and judge whether the current coal-fired boiler deactivation protection method is reliable and effective.
  • the embodiment of the first aspect of the present disclosure proposes a method for evaluating the anti-corrosion effect of thermal power unit shutdown protection, including:
  • the total iron content in the start-up stage of the unit is calculated by a preset total iron content fitting formula
  • the measuring the cumulative flow at the outlet of the condensate pump during the start-up phase of the unit includes:
  • the second cumulative flow of the unit is measured from the start of the steam turbine rushing to the grid connection of the steam turbine generator set.
  • the measurement of the mass content of iron in the water vapor related to the heating surface of the boiler during the start-up phase of the unit includes: iron content in condensate, iron content in feed water, iron content in boiler water or start-up separator water, Iron content of superheated steam.
  • the calculating and obtaining the average value of the iron content in the steam related to the heating surface of the boiler includes: within a detection period, calculating and obtaining the average value of the iron content in the steam related to the heating surface of the boiler average iron content.
  • the preset total iron amount fitting formula is:
  • M total iron content V at the end of hot flushing ⁇ c average value of iron content in condensate + V at the end of hot flushing ⁇ c average value of iron content in feed water + V at the end of hot flushing ⁇ c boiler water or start-up separator outlet water
  • M total iron content is the total iron content in the start-up stage of the unit
  • V at the end of the hot state flushing is the first cumulative flow rate of the unit from the start of the stable operation of the condensate pump to the end of the hot state flushing
  • the V steam turbine running stage to When connected to the grid it is the second cumulative flow of the unit from the start of the steam turbine to the grid connection of the steam turbine generator set.
  • the average value of iron content in condensed water is the average value of iron content in condensed water
  • the average value of iron content in feed water is the average value of iron content in feed water
  • the average value of iron content in boiler water or starting separator water is the average value of iron content in boiler water or starting separator water
  • the average value of iron content in superheated steam is the average value of iron content in superheated steam.
  • the method for evaluating the anti-corrosion effect of thermal power unit shutdown protection further includes the steps of adding ammonia to condensed water and ammonia to feedwater during the start-up phase.
  • the embodiment of the second aspect of the present disclosure proposes an evaluation device for the anti-corrosion effect of thermal power unit shutdown protection, including:
  • An iron content measurement module used to measure the mass content of iron in the water vapor associated with the heating surface of the boiler during the start-up phase of the unit
  • the iron content measurement module includes a calculation unit, which is used to calculate and obtain the average value of the iron content in the water vapor corresponding to the heating surface of the boiler;
  • the total iron content calculation module is used to calculate the total iron content of the unit at the start-up stage according to the cumulative flow and the average value of the iron content by a preset total iron content fitting formula
  • the evaluation module is used to use the total iron content as an evaluation index to evaluate the effect of shutdown protection and anti-corrosion of the unit before the start-up.
  • the cumulative flow measurement module includes:
  • the first-stage measurement module is used to measure the first cumulative flow of the unit from the start of stable operation after the start of the condensate pump to the end of the hot state flushing;
  • the second stage measurement module is used to measure the second cumulative flow of the unit from the start of the steam turbine run-in to the grid connection of the steam turbine generator set.
  • the iron content measurement module includes:
  • the first measurement module is used to measure the iron content of the condensed water
  • the second measurement module is used to measure the iron content of the feed water
  • a third measurement module for measuring iron content in boiler water or start-up separator effluent
  • the fourth measurement module is used to measure the iron content of the superheated steam.
  • the evaluation device for the protection and anti-corrosion effect of the thermal power unit shutdown further includes: condensate water ammonia addition equipment and feed water ammonia addition equipment.
  • the embodiment of the present disclosure provides a method and device for evaluating the anti-corrosion effect of thermal power unit shutdown protection.
  • Any one of the shutdown protection methods can be selected to protect the unit for a period of time, and then start the unit to evaluate the anti-corrosion protection effect , with a wide range of applications; by measuring the cumulative flow at each stage of startup and the iron content of each water vapor system on the main heating surface of the coal-fired boiler and fitting calculations to obtain the corresponding total iron content in the system, the shutdown protection of each water vapor system of the coal-fired boiler.
  • the total iron content can effectively grasp the huge coal-fired boiler water vapor system pipeline under the shutdown protection state.
  • the anti-corrosion situation of the coal-fired boiler and judge whether the currently adopted coal-fired boiler decommissioning protection method is reliable and effective, so as to avoid the safety hazard caused by the decommissioning of the coal-fired boiler.
  • the preconditions can be standardized uniformly, which is convenient for each coal-fired boiler outage protection method and each coal-fired boiler outage protection.
  • Fig. 1 is a process flow diagram of an evaluation device according to an embodiment of the present disclosure
  • Fig. 3 is a flowchart for implementing an evaluation method according to an embodiment of the present disclosure.
  • Selection module 100 cumulative flow measurement module 110, first stage measurement module 111, second stage measurement module 112, iron content measurement module 120, first measurement module 121, second measurement module 122, third measurement module 123, fourth A measurement module 124 , a total iron content calculation module 130 , and an evaluation module 140 .
  • the embodiment of the disclosure proposes an evaluation method and device for the protection and anti-corrosion effect of the thermal power unit shutdown protection.
  • the monitoring and control methods are as follows: The total iron content in the effluent water vapor of each heating surface during the start-up stage of the coal-fired boiler of the thermal power unit indicates the anti-corrosion effect of the coal-fired boiler when it is out of service.
  • the embodiment of the present disclosure proposes an evaluation method for the anti-corrosion effect of thermal power unit shutdown protection, including:
  • the total iron content in the start-up stage of the unit is calculated by the preset total iron content fitting formula
  • the total iron content is used as an evaluation index to evaluate the anti-corrosion effect of the shutdown protection before the start-up of the unit. The higher the total iron content, the worse the anti-corrosion effect of the shutdown protection method.
  • the method and device for evaluating the anti-corrosion effect of thermal power unit shutdown protection can choose any shutdown protection method to protect the unit for a period of time, and then start the unit to evaluate the anti-corrosion protection effect. It has a wide range of applications; by measuring the cumulative flow at each stage of startup and the iron content of each water vapor system on the main heating surface of the coal-fired boiler, and fitting and calculating the corresponding total iron content in the system, it can protect and prevent the shutdown of each water vapor system of the coal-fired boiler
  • the corrosion situation has been very effectively characterized, the data accuracy is high, the results are intuitive and clear, and the device structure is simple, and the operation is easy to implement.
  • the total iron content can effectively grasp the huge coal-fired boiler water vapor system pipeline under the shutdown protection state. Anti-corrosion conditions, and judge whether the currently adopted coal-fired boiler decommissioning protection method is reliable and effective, and avoid potential safety hazards caused by coal-fired boiler decommissioning corrosion.
  • the cumulative flow at the outlet of the condensate pump during the start-up phase of the unit is measured, including:
  • measure the iron content in the water vapor related to the heating surface of the boiler during the start-up stage of the unit including:
  • Iron content in condensate iron content in feed water, iron content in boiler water or starting separator effluent and iron content in superheated steam.
  • the detection period may vary from 1 hour, 2 hours or 3 hours, and the detection period is determined according to the actual situation.
  • the average value of the iron content is calculated according to the mass content of iron in the water vapor related to the heating surface of the boiler, including calculating the average value of the iron content in the condensate, the average value of the iron content in the feed water, the boiler water or the start-up separator Average iron content in effluent, average iron content in superheated steam.
  • the preset total iron amount fitting formula is as follows:
  • M total iron content V at the end of hot flushing ⁇ c average value of iron content in condensate + V at the end of hot flushing ⁇ c average value of iron content in feed water + V at the end of hot flushing ⁇ c boiler water or start-up separator outlet water
  • M total iron content is the total iron content in the start-up stage of the unit
  • V at the end of the hot state flushing is the first cumulative flow rate of the unit from the start of the stable operation of the condensate pump to the end of the hot state flushing
  • the V steam turbine running stage to When connected to the grid it is the second cumulative flow of the unit from the start of the steam turbine to the grid connection of the steam turbine generator set.
  • the average value of iron content in condensed water is the average value of iron content in condensed water
  • the average value of iron content in feed water is the average value of iron content in feed water
  • the average value of iron content in boiler water or starting separator water is the average value of iron content in boiler water or starting separator water
  • the average value of iron content in superheated steam is the average value of iron content in superheated steam.
  • the method for evaluating the anti-corrosion effect of thermal power unit shutdown protection and anti-corrosion also includes the steps of adding ammonia to condensed water and adding ammonia to feedwater during the start-up phase.
  • the pH value of the feed water is controlled at 9.5 ⁇ 0.1, that is, the conductivity
  • the rate is controlled within the range of 6.8 ⁇ S/cm to 10.8 ⁇ S/cm.
  • the preconditions can be unified and standardized, which is convenient for the shutdown protection of each coal-fired boiler.
  • the method and the anti-corrosion effect of each coal-fired boiler shutdown protection are compared horizontally, and the same protection method can be compared and observed with the change of the shutdown time, the change of the anti-corrosion effect, and the endurance of its protection can be judged; it can also be compared Based on the protection effect of different protection methods in the same outage time, a better protection scheme can be selected, and the protection method can be further optimized, which has strong practicability.
  • Fig. 1 is a process flow diagram of an evaluation device according to an embodiment of the present disclosure.
  • the evaluation device of the thermal power unit shutdown protection anti-corrosion effect may include:
  • the selection module 100 is used to select any one of the shutdown protection methods to protect the unit for a preset shutdown time before evaluation;
  • the cumulative flow measurement module 110 is used to measure the cumulative flow at the outlet of the condensate pump during the start-up phase of the unit;
  • the iron content measurement module 120 is used to measure the mass content of iron in the water vapor related to the heating surface of the boiler during the start-up stage of the unit,
  • the iron content measurement module 120 includes a calculation unit for calculating the average value of the iron content in the water vapor corresponding to the heating surface of the boiler;
  • the total iron content calculation module 130 is used to calculate the total iron content at the start-up stage of the unit according to the cumulative flow and the average value of the iron content by a preset total iron content fitting formula;
  • the evaluation module 140 is used to use the total iron content as an evaluation index to evaluate the anti-corrosion effect of the shutdown protection of the unit before the start-up.
  • the cumulative flow measurement module 110 includes:
  • the first-stage measurement module 111 is used to measure the first cumulative flow of the unit from the start of stable operation after the start of the condensate pump to the end of the hot state flushing;
  • the second stage measurement module 112 is used to measure the second cumulative flow of the unit from the start of the steam turbine run-in to the grid connection of the steam turbine generator set.
  • the iron content measurement module 120 includes:
  • the first measurement module 121 is used to measure the iron content of the condensed water
  • the second measurement module 122 is used to measure the iron content of the feed water
  • the third measurement module 123 is used to measure the iron content in the furnace water or start the separator effluent.
  • the fourth measurement module 124 is used to measure the iron content of the superheated steam.
  • the calculation unit is also used to calculate 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 within the detection period.
  • the evaluation device for the protection and anti-corrosion effect of the thermal power unit shutdown further includes condensate water ammonia addition equipment and feedwater ammonia addition equipment that are in operation.
  • the method and device proposed in the embodiments of the present disclosure specifically quantify the evaluation of the anti-corrosion effect of the thermal power unit’s coal-fired boiler decommissioning protection, and the specific data of the total iron content finally obtained can be used to compare the anti-corrosion effects of the decommissioning protection of the unit , can also be used for comparison of anti-corrosion effects under different out-of-service protection methods, and can also be used for comparison of out-of-service protection and anti-corrosion effects under similar units.
  • This is an evaluation method that can directly compare data; in addition, the implementation of the present disclosure
  • the method and device proposed in this example have more specific and specific requirements and monitoring for the supervision of water vapor quality during the start-up process of the unit, and there are rules to follow and evidence to follow.
  • an ultra-supercritical 660MW DC furnace is selected for shutdown protection, and the coal-fired boiler shutdown protection method adopts the method of increasing the pH value of the feed water for protection.
  • the evaluation method and device of the embodiment of the present disclosure are used to evaluate the anti-corrosion effect of the coal-fired boiler shutdown protection under different shutdown protection times, as follows:
  • the fine treatment high-speed mixed bed of the unit is not put into operation, and the condensate water ammonia addition equipment and the feed water ammonia addition equipment are put into operation to control the pH value of the feed water to maintain between 9.5 ⁇ 0.1 and the conductivity to be controlled at 7.0 ⁇ S/cm ⁇ 10.0 ⁇ S/cm;
  • the average iron content in condensate is 111.8 ⁇ g/L;
  • the average iron content in feed water is 82 ⁇ g/L
  • the average iron content in the effluent from the separator is 102.1 ⁇ g/L;
  • the average iron content of superheated steam is 30.3 ⁇ g/L;
  • the total iron content is calculated to be 2781.3kg.
  • the average iron content in condensate is 24 ⁇ g/L;
  • the average iron content in feed water is 9.5 ⁇ g/L
  • the average iron content in the effluent from the separator is 12.5 ⁇ g/L;
  • the average iron content of superheated steam is 5.5 ⁇ g/L
  • the total iron content is calculated to be 375.0 kg.
  • Nitrogen gas protection method is used: the unit starts after about 179 days of shutdown protection: at the end of hot flushing, the cumulative flow at the outlet of the condensate pump is 8173t, the average iron content of the condensate is 86.9 ⁇ g/L, and the average iron content of the feed water is 71.3 ⁇ g/L, the average iron content of the effluent from the separator is 80.9 ⁇ g/L; when the steam turbine is running and connected to the grid, the cumulative flow at the outlet of the condensate pump is 3019t, and the average iron content of the superheated steam is 26.1 ⁇ g/L. According to the fitting formula proposed in this method, the total iron content is 2033.0kg.
  • the protection method of increasing the pH value of the feed water is adopted: the unit starts up after 170 days of shutdown protection: at the end of the hot state flushing, the cumulative flow at the outlet of the condensate pump is 9014t, the average iron content of the condensate is 111.8 ⁇ g/L, and the average iron content of the feed water 82 ⁇ g/L, and the average iron content in the effluent from the separator is 102.1 ⁇ g/L; when the steam turbine is running and connected to the grid, the cumulative flow at the outlet of the condensate pump is 3765t, and the average iron content in the superheated steam is 30.3 ⁇ g/L. According to the fitting formula proposed in this method, the total iron content is 2781.3kg.
  • the corrosion amount of the same unit using the nitrogen filling shutdown protection method is less than that of increasing the feed water pH value in the same shutdown time, indicating that the nitrogen filling shutdown protection method is more effective.
  • the anti-corrosion effect of the furnace shutdown protection is better, and the method proposed in the embodiment of the present disclosure can also be used to compare the anti-corrosion effects of different furnace shutdown protection methods, so as to select a better furnace shutdown protection method.

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Abstract

A method and apparatus for assessing the boiler lay-up protection anti-corrosion effect of a thermal power unit. The method comprises: measuring an accumulative flow of an outlet of a condensed water pump at a startup stage of a unit; measuring the mass content of iron in related water vapor of a heating surface of a boiler at the startup stage of the unit, and performing calculation to obtain the average value of the iron content in the related water vapor corresponding to the heating surface of the boiler; according to the accumulative flow and the average value of the iron content, calculating the total iron content at the startup stage of the unit by means of a preset total iron content fitting formula; and by taking the total iron content as an assessment index, assessing a boiler lay-up protection anti-corrosion effect before the unit is started this time.

Description

一种火电机组停炉保护防锈蚀效果的评价方法及装置A method and device for evaluating the anti-corrosion effect of thermal power unit shutdown protection
相关申请的交叉引用Cross References to Related Applications
本申请基于申请号为202111327974.7、申请日为2021年11月10日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本申请作为参考。This application is based on a Chinese patent application with application number 202111327974.7 and a filing date of November 10, 2021, and claims the priority of this Chinese patent application. The entire content of this Chinese patent application is hereby incorporated by reference into this application.
技术领域technical field
本公开属于锅炉腐蚀保护技术领域，具体涉及一种火电机组停炉保护防锈蚀效果的评价方法及装置。The disclosure belongs to the technical field of boiler corrosion protection, and in particular relates to a method and device for evaluating the anti-corrosion effect of thermal power unit shutdown protection.
背景技术Background technique
近年来随着核电、水电、风电和光伏发电机组的不断投入运行，火电机组严格控制投运时间，面临着越来越长的停用状态或者越来越多的启停次数。因此对火电机组燃煤锅炉停用保护的防锈蚀要求也越来越严格，以防止燃煤锅炉在停用期间发生大量腐蚀，保障机组燃煤锅炉能随时安全可靠启动，并保持长期正常安全稳定运行，避免由于停用腐蚀造成的燃煤锅炉在运行过程中发生爆管等事故。In recent years, with the continuous operation of nuclear power, hydropower, wind power and photovoltaic power generation units, thermal power units have strictly controlled the operation time, and are facing longer and longer periods of outage or more and more times of start and stop. Therefore, the anti-corrosion requirements for the decommissioning protection of coal-fired boilers of thermal power units are becoming more and more stringent, so as to prevent a large amount of corrosion of coal-fired boilers during decommissioning, ensure that the coal-fired boilers of the units can be started safely and reliably at any time, and maintain long-term normal safety and stability operation, to avoid accidents such as pipe bursts during the operation of coal-fired boilers caused by out-of-service corrosion.
目前，对于火电机组燃煤锅炉停用保护防锈蚀方法在相关标准中已经有较多的记录，但是却没有任何一种对于燃煤锅炉停用保护防锈蚀效果的评价方法，导致无法对燃煤锅炉的停用保护防锈蚀效果进行评价，不能掌握停用保护状态下的庞大的燃煤锅炉水汽***的防锈蚀情况，不能表征采用的燃煤锅炉停用保护方法是否可靠有效，为停用保护不当造成的燃煤锅炉腐蚀甚至 在后续的运行中发生爆管埋下安全隐患。At present, there have been many records in the relevant standards for the protection and anti-corrosion methods of coal-fired boilers in thermal power units, but there is no evaluation method for the protection and anti-corrosion effect of coal-fired boilers when they are out of service. The evaluation of the anti-corrosion effect of the boiler outage protection cannot grasp the anti-corrosion situation of the huge coal-fired boiler water vapor system under the outage protection state, and cannot characterize whether the coal-fired boiler outage protection method adopted is reliable and effective. Corrosion of coal-fired boilers caused by improper operation may even cause tube explosions in subsequent operations, burying potential safety hazards.
发明内容Contents of the invention
为了解决相关技术中存在的问题，本公开实施例提供一种火电机组停炉保护防锈蚀效果的评价方法及装置，操作简单，易实施，可以有效掌握停炉保护状态下庞大燃煤锅炉水汽***管道内的防锈蚀情况，并判断目前采用的燃煤锅炉停用保护方法是否可靠有效。In order to solve the problems existing in the related technology, the embodiment of the present disclosure provides an evaluation method and device for the anti-corrosion effect of thermal power unit shutdown protection, which is simple to operate and easy to implement, and can effectively control the water vapor system of a huge coal-fired boiler under the shutdown protection state The anti-corrosion situation in the pipeline, and judge whether the current coal-fired boiler deactivation protection method is reliable and effective.
为实现上述目的，本公开提供如下技术方案。To achieve the above purpose, the present disclosure provides the following technical solutions.
本公开第一方面实施例提出一种火电机组停炉保护防锈蚀效果的评价方法，包括：The embodiment of the first aspect of the present disclosure proposes a method for evaluating the anti-corrosion effect of thermal power unit shutdown protection, including:
测量机组启动阶段凝结水泵出口的累积流量；Measure the cumulative flow at the outlet of the condensate pump during the start-up phase of the unit;
测量所述机组所述启动阶段与锅炉受热面相关水汽中铁的质量含量，计算得到对应所述锅炉受热面相关水汽中的铁含量平均值；Measuring the mass content of iron in the water vapor related to the heating surface of the boiler during the start-up phase of the unit, and calculating the average value of the iron content in the water vapor corresponding to the heating surface of the boiler;
根据所述累积流量和所述铁含量平均值，由预设的总铁量拟合式计算出所述机组所述启动阶段的总铁含量；和According to the cumulative flow and the average value of the iron content, the total iron content in the start-up stage of the unit is calculated by a preset total iron content fitting formula; and
以所述总铁含量作为评价指标，对所述机组该次启动前的停炉保护防锈蚀效果进行评价。Taking the total iron content as an evaluation index, the anti-corrosion effect of the shutdown protection of the unit before the start-up is evaluated.
在一些实施例中，所述测量机组启动阶段凝结水泵出口的累积流量，包括：In some embodiments, the measuring the cumulative flow at the outlet of the condensate pump during the start-up phase of the unit includes:
测量所述机组从所述凝结水泵启动后稳定运行开始至热态冲洗结束该阶段的第一累积流量；和Measuring the first cumulative flow of the unit from the start of stable operation after the condensate pump is started to the end of hot flushing; and
测量所述机组从汽轮机冲转开始至汽轮发电机组并网该阶段的第二累积流量。The second cumulative flow of the unit is measured from the start of the steam turbine rushing to the grid connection of the steam turbine generator set.
在一些实施例中，所述测量所述机组所述启动阶段与锅炉受热面相关水汽中的铁的质量含量，包括：凝结水铁含量、给水铁含量、炉水或启动分离器出水铁含量、过热蒸汽铁含量。In some embodiments, the measurement of the mass content of iron in the water vapor related to the heating surface of the boiler during the start-up phase of the unit includes: iron content in condensate, iron content in feed water, iron content in boiler water or start-up separator water, Iron content of superheated steam.
在一些实施例中，所述计算得到对应所述锅炉受热面相关水汽中的铁含量平均值包括：在检测周期内，根据所述锅炉受热面相关水汽中的所述铁的质量含量计算得到所述铁含量平均值。In some embodiments, the calculating and obtaining the average value of the iron content in the steam related to the heating surface of the boiler includes: within a detection period, calculating and obtaining the average value of the iron content in the steam related to the heating surface of the boiler average iron content.
在一些实施例中，所述预设的总铁量拟合式为：In some embodiments, the preset total iron amount fitting formula is:
M 总铁量＝V 热态冲洗结束时×c 凝结水铁含量平均值+V 热态冲洗结束时×c 给水铁含量平均值+V 热态冲洗结束时×c 炉水或启动分离器出水铁含量平均值+V 汽轮机冲转阶段至并网时×c 过热蒸汽铁含量平均值， M total iron content = V at the end of hot flushing × c average value of iron content in condensate + V at the end of hot flushing × c average value of iron content in feed water + V at the end of hot flushing × c boiler water or start-up separator outlet water iron The average value of content + V from the stage of steam turbine rushing to grid connection × c average value of iron content in superheated steam ,
其中，M 总铁量为机组启动阶段的总铁含量，V 热态冲洗结束时为机组从凝结水泵启动后稳定运行开始至热态冲洗结束该阶段的第一累积流量，V 汽轮机冲 转阶段至并网时为机组从汽轮机冲转开始至汽轮发电机组并网该阶段的第二累积流量， Among them, M total iron content is the total iron content in the start-up stage of the unit, V at the end of the hot state flushing is the first cumulative flow rate of the unit from the start of the stable operation of the condensate pump to the end of the hot state flushing, and the V steam turbine running stage to When connected to the grid, it is the second cumulative flow of the unit from the start of the steam turbine to the grid connection of the steam turbine generator set.
c 凝结水铁含量平均值为凝结水铁含量平均值，c 给水铁含量平均值为给水铁含量平均值，c 炉水或启动分离器出水铁含量平均值为炉水或启动分离器出水铁含量平均值，c 过热蒸汽铁含量平均值为过热蒸汽铁含量平均值。 c The average value of iron content in condensed water is the average value of iron content in condensed water, c The average value of iron content in feed water is the average value of iron content in feed water, c The average value of iron content in boiler water or starting separator water is the average value of iron content in boiler water or starting separator water Average value, c The average value of iron content in superheated steam is the average value of iron content in superheated steam.
在一些实施例中，所述火电机组停炉保护防锈蚀效果的评价方法还包括在所述启动阶段进行凝结水加氨和给水加氨的步骤。In some embodiments, the method for evaluating the anti-corrosion effect of thermal power unit shutdown protection further includes the steps of adding ammonia to condensed water and ammonia to feedwater during the start-up phase.
本公开第二方面实施例提出一种火电机组停炉保护防锈蚀效果的评价装置，包括：The embodiment of the second aspect of the present disclosure proposes an evaluation device for the anti-corrosion effect of thermal power unit shutdown protection, including:
累积流量测量模块，用于测量机组启动阶段凝结水泵出口的累积流量；The cumulative flow measurement module is used to measure the cumulative flow at the outlet of the condensate pump during the start-up phase of the unit;
铁含量测量模块，用于测量所述机组所述启动阶段与所述锅炉受热面相 关水汽中的铁的质量含量，An iron content measurement module, used to measure the mass content of iron in the water vapor associated with the heating surface of the boiler during the start-up phase of the unit,
其中所述铁含量测量模块包括计算单元，用于计算得到对应所述锅炉受热面相关水汽中的铁含量平均值；Wherein the iron content measurement module includes a calculation unit, which is used to calculate and obtain the average value of the iron content in the water vapor corresponding to the heating surface of the boiler;
总铁含量计算模块，用于根据所述累积流量和所述铁含量平均值，由预设的总铁量拟合式计算出所述机组所述启动阶段的总铁含量；和The total iron content calculation module is used to calculate the total iron content of the unit at the start-up stage according to the cumulative flow and the average value of the iron content by a preset total iron content fitting formula; and
评价模块，用于以所述总铁含量作为评价指标，对所述机组该次启动前的停炉保护防锈蚀效果进行评价。The evaluation module is used to use the total iron content as an evaluation index to evaluate the effect of shutdown protection and anti-corrosion of the unit before the start-up.
在一些实施例中，所述累积流量测量模块包括：In some embodiments, the cumulative flow measurement module includes:
第一阶段测量模块，用于测量所述机组从所述凝结水泵启动后稳定运行开始至热态冲洗结束该阶段的第一累积流量；和The first-stage measurement module is used to measure the first cumulative flow of the unit from the start of stable operation after the start of the condensate pump to the end of the hot state flushing; and
第二阶段测量模块，用于测量所述机组从汽轮机冲转开始至汽轮发电机组并网该阶段的第二累积流量。The second stage measurement module is used to measure the second cumulative flow of the unit from the start of the steam turbine run-in to the grid connection of the steam turbine generator set.
在一些实施例中，所述铁含量测量模块包括：In some embodiments, the iron content measurement module includes:
第一测量模块，用于测量凝结水铁含量；The first measurement module is used to measure the iron content of the condensed water;
第二测量模块，用于测量给水铁含量；The second measurement module is used to measure the iron content of the feed water;
第三测量模块，用于测量炉水或启动分离器出水铁含量；和A third measurement module for measuring iron content in boiler water or start-up separator effluent; and
第四测量模块，用于测量过热蒸汽铁含量。The fourth measurement module is used to measure the iron content of the superheated steam.
在一些实施例中，所述火电机组停炉保护防锈蚀效果的评价装置还包括：凝结水加氨设备和给水加氨设备。In some embodiments, the evaluation device for the protection and anti-corrosion effect of the thermal power unit shutdown further includes: condensate water ammonia addition equipment and feed water ammonia addition equipment.
与相关技术相比，本公开具有以下有益效果：Compared with related technologies, the present disclosure has the following beneficial effects:
本公开实施例提供一种火电机组停炉保护防锈蚀效果的评价方法及装置，可以选取任意一种停炉保护方法对机组进行一段时间的保护后，启动机组对其进行防锈蚀保护效果的评价，适用范围广泛；通过测量启动各阶段的累积 流量和燃煤锅炉主要受热面各水汽***的铁含量并拟合计算得到***内相应的总铁含量，对燃煤锅炉各水汽***的停用保护防锈蚀情况进行了非常有效的表征，数据准确度高，结果直观清晰，且装置构造简单，操作易实施，通过总铁含量能够有效掌握停炉保护状态下的庞大的燃煤锅炉水汽***管道内的防锈蚀情况，并判断目前采用的燃煤锅炉停用保护方法是否可靠有效，避免燃煤锅炉停用腐蚀产生的安全隐患。The embodiment of the present disclosure provides a method and device for evaluating the anti-corrosion effect of thermal power unit shutdown protection. Any one of the shutdown protection methods can be selected to protect the unit for a period of time, and then start the unit to evaluate the anti-corrosion protection effect , with a wide range of applications; by measuring the cumulative flow at each stage of startup and the iron content of each water vapor system on the main heating surface of the coal-fired boiler and fitting calculations to obtain the corresponding total iron content in the system, the shutdown protection of each water vapor system of the coal-fired boiler The anti-corrosion situation has been very effectively characterized, the data accuracy is high, the results are intuitive and clear, and the device structure is simple, and the operation is easy to implement. The total iron content can effectively grasp the huge coal-fired boiler water vapor system pipeline under the shutdown protection state. The anti-corrosion situation of the coal-fired boiler, and judge whether the currently adopted coal-fired boiler decommissioning protection method is reliable and effective, so as to avoid the safety hazard caused by the decommissioning of the coal-fired boiler.
根据本公开实施例，通过在启动阶段随时进行凝结水加氨和给水加氨，并且机组的此次启动过程中不投运任何精处理设备，可以保证给水pH值控制在适宜范围内，即电导率控制在优选范围内，对于启动过程中加药对水汽控制和精处理设备的规定，可以统一规范前提条件，便于对每种燃煤锅炉停用保护方法以及每次燃煤锅炉停用保护的防锈蚀效果进行横向比较，可以对比观察到同一种保护方法随着停用时间的变化，防锈蚀效果的变化，判断其保护的续航能力；也可以比对不同保护方法在相同停用时间内的保护效果，从而选择更优的保护方案，并且可以对保护方法进行进一步地优化，实用性强。According to the embodiment of the present disclosure, by adding ammonia to condensate water and feed water at any time during the start-up phase, and not putting any finishing equipment into operation during the start-up process of the unit, it can be ensured that the pH value of the feed water is controlled within an appropriate range, that is, the conductivity The rate is controlled within the optimal range. For the regulations on water vapor control and finishing equipment during the start-up process, the preconditions can be standardized uniformly, which is convenient for each coal-fired boiler outage protection method and each coal-fired boiler outage protection. The anti-corrosion effect is compared horizontally, and the change of the same protection method with the outage time and the change in the anti-corrosion effect can be observed by comparison, and the endurance of its protection can be judged; it can also be compared with different protection methods in the same outage time. The protection effect, so as to select a better protection scheme, and further optimize the protection method, with strong practicability.
附图说明Description of drawings
图1是根据本公开实施例的评价装置工艺流程图；Fig. 1 is a process flow diagram of an evaluation device according to an embodiment of the present disclosure;
图2是根据本公开实施例的评价方法流程图；2 is a flowchart of an evaluation method according to an embodiment of the disclosure;
图3是根据本公开实施例的评价方法实施流程图。Fig. 3 is a flowchart for implementing an evaluation method according to an embodiment of the present disclosure.
附图标记：Reference signs:
选取模块100，累积流量测量模块110，第一阶段测量模块111，第二阶段测量模块112，铁含量测量模块120，第一测量模块121，第二测量模 块122，第三测量模块123，第四测量模块124，总铁含量计算模块130，评价模块140。 Selection module 100, cumulative flow measurement module 110, first stage measurement module 111, second stage measurement module 112, iron content measurement module 120, first measurement module 121, second measurement module 122, third measurement module 123, fourth A measurement module 124 , a total iron content calculation module 130 , and an evaluation module 140 .
具体实施方式Detailed ways
下面结合具体的实施例对本公开做进一步的详细说明，所述是对本公开的解释而不是限定。The present disclosure will be further described in detail below in conjunction with specific embodiments, which are explanations rather than limitations of the present disclosure.
本公开实施例根据对火电机组冷态启动过程中水汽品质的检测数据分析和试验研究成果，提出了一种火电机组停炉保护防锈蚀效果的评价方法及装置，所监测和控制方法为：采用火电机组燃煤锅炉启动阶段各受热面出水水汽中的总铁含量表征燃煤锅炉停用保护防锈蚀的效果，总铁含量越低，燃煤锅炉停用保护防锈蚀效果越佳。According to the detection data analysis and experimental research results of the water vapor quality during the cold start-up process of the thermal power unit, the embodiment of the disclosure proposes an evaluation method and device for the protection and anti-corrosion effect of the thermal power unit shutdown protection. The monitoring and control methods are as follows: The total iron content in the effluent water vapor of each heating surface during the start-up stage of the coal-fired boiler of the thermal power unit indicates the anti-corrosion effect of the coal-fired boiler when it is out of service.
具体的，如图2所示，本公开实施例提出了一种火电机组停炉保护防锈蚀效果的评价方法，包括：Specifically, as shown in Figure 2, the embodiment of the present disclosure proposes an evaluation method for the anti-corrosion effect of thermal power unit shutdown protection, including:
在进行评价前，选取任意一种停炉保护方法对机组进行预设停炉时间的保护；Before the evaluation, choose any one of the shutdown protection methods to protect the unit for the preset shutdown time;
测量机组启动阶段凝结水泵出口的累积流量；Measure the cumulative flow at the outlet of the condensate pump during the start-up phase of the unit;
测量机组启动阶段与锅炉受热面相关水汽中的铁的质量含量，计算得到对应锅炉受热面相关水汽中的铁含量平均值；Measure the mass content of iron in the water vapor related to the heating surface of the boiler during the start-up stage of the unit, and calculate the average value of the iron content in the water vapor related to the heating surface of the corresponding boiler;
根据累积流量和铁含量平均值，由预设的总铁量拟合式计算出机组启动阶段的总铁含量；According to the cumulative flow and the average value of iron content, the total iron content in the start-up stage of the unit is calculated by the preset total iron content fitting formula;
以总铁含量作为评价指标，对机组该次启动前的停炉保护防锈蚀效果进行评价，总含铁量越高，则该停炉保护方法的防锈蚀效果越差。The total iron content is used as an evaluation index to evaluate the anti-corrosion effect of the shutdown protection before the start-up of the unit. The higher the total iron content, the worse the anti-corrosion effect of the shutdown protection method.
本公开实施例提供的火电机组停炉保护防锈蚀效果的评价方法及装置， 可以选取任意一种停炉保护方法对机组进行一段时间的保护后，启动机组对其进行防锈蚀保护效果的评价，适用范围广泛；通过测量启动各阶段的累积流量和燃煤锅炉主要受热面各水汽***的铁含量并拟合计算得到***内相应的总铁含量，对燃煤锅炉各水汽***的停用保护防锈蚀情况进行了非常有效的表征，数据准确度高，结果直观清晰，且装置构造简单，操作易实施，通过总铁含量能够有效掌握停炉保护状态下的庞大的燃煤锅炉水汽***管道内的防锈蚀情况，并判断目前采用的燃煤锅炉停用保护方法是否可靠有效，避免燃煤锅炉停用腐蚀产生的安全隐患。The method and device for evaluating the anti-corrosion effect of thermal power unit shutdown protection provided by the embodiments of the present disclosure can choose any shutdown protection method to protect the unit for a period of time, and then start the unit to evaluate the anti-corrosion protection effect. It has a wide range of applications; by measuring the cumulative flow at each stage of startup and the iron content of each water vapor system on the main heating surface of the coal-fired boiler, and fitting and calculating the corresponding total iron content in the system, it can protect and prevent the shutdown of each water vapor system of the coal-fired boiler The corrosion situation has been very effectively characterized, the data accuracy is high, the results are intuitive and clear, and the device structure is simple, and the operation is easy to implement. The total iron content can effectively grasp the huge coal-fired boiler water vapor system pipeline under the shutdown protection state. Anti-corrosion conditions, and judge whether the currently adopted coal-fired boiler decommissioning protection method is reliable and effective, and avoid potential safety hazards caused by coal-fired boiler decommissioning corrosion.
如图3所示，进一步地，测量机组启动阶段凝结水泵出口的累积流量，包括：As shown in Figure 3, further, the cumulative flow at the outlet of the condensate pump during the start-up phase of the unit is measured, including:
测量机组从凝结水泵启动后稳定运行开始至热态冲洗结束该阶段的第一累积流量；Measure the first cumulative flow of the unit from the start of stable operation after the start of the condensate pump to the end of hot flushing;
测量机组从汽轮机冲转开始至汽轮发电机组并网该阶段的第二累积流量。Measure the second cumulative flow of the unit from the start of the steam turbine run-in to the grid connection of the steam turbine generator set.
具体地，热态冲洗结束时与汽轮机冲转开始时是同一时间。Specifically, the end of hot flushing is the same time as the start of steam turbine flushing.
进一步地，测量机组启动阶段与锅炉受热面相关水汽中的铁含量，包括：Further, measure the iron content in the water vapor related to the heating surface of the boiler during the start-up stage of the unit, including:
凝结水铁含量、给水铁含量、炉水或启动分离器出水铁含量和过热蒸汽铁含量。Iron content in condensate, iron content in feed water, iron content in boiler water or starting separator effluent and iron content in superheated steam.
本公开实施例中，测量机组启动阶段锅炉受热面相关水汽中的铁含量平均值，包括：在检测周期内，根据锅炉受热面相关水汽中的铁含量计算铁含量算术平均值。In the embodiment of the present disclosure, the measurement of the average value of the iron content in the water vapor related to the heating surface of the boiler during the start-up stage of the unit includes: 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 within the detection period.
在一些实施例中，检测周期可以为1小时、2小时或3小时不等，根据实际情况确定检测周期。In some embodiments, the detection period may vary from 1 hour, 2 hours or 3 hours, and the detection period is determined according to the actual situation.
本公开实施例中，在检测周期内，根据锅炉受热面相关水汽中的铁的质 量含量计算得到铁含量平均值包括计算凝结水铁含量平均值，给水铁含量平均值，炉水或启动分离器出水铁含量平均值，过热蒸汽铁含量平均值。In the embodiment of the present disclosure, within the detection period, the average value of the iron content is calculated according to the mass content of iron in the water vapor related to the heating surface of the boiler, including calculating the average value of the iron content in the condensate, the average value of the iron content in the feed water, the boiler water or the start-up separator Average iron content in effluent, average iron content in superheated steam.
本公开实施例中，预设的总铁量拟合式如下：In the embodiment of the present disclosure, the preset total iron amount fitting formula is as follows:
M 总铁量＝V 热态冲洗结束时×c 凝结水铁含量平均值+V 热态冲洗结束时×c 给水铁含量平均值+V 热态冲洗结束时×c 炉水或启动分离器出水铁含量平均值+V 汽轮机冲转阶段至并网时×c 过热蒸汽铁含量平均值， M total iron content = V at the end of hot flushing × c average value of iron content in condensate + V at the end of hot flushing × c average value of iron content in feed water + V at the end of hot flushing × c boiler water or start-up separator outlet water iron The average value of content + V from the stage of steam turbine rushing to grid connection × c average value of iron content in superheated steam ,
其中，M 总铁量为机组启动阶段的总铁含量，V 热态冲洗结束时为机组从凝结水泵启动后稳定运行开始至热态冲洗结束该阶段的第一累积流量，V 汽轮机冲 转阶段至并网时为机组从汽轮机冲转开始至汽轮发电机组并网该阶段的第二累积流量， Among them, M total iron content is the total iron content in the start-up stage of the unit, V at the end of the hot state flushing is the first cumulative flow rate of the unit from the start of the stable operation of the condensate pump to the end of the hot state flushing, and the V steam turbine running stage to When connected to the grid, it is the second cumulative flow of the unit from the start of the steam turbine to the grid connection of the steam turbine generator set.
c 凝结水铁含量平均值为凝结水铁含量平均值，c 给水铁含量平均值为给水铁含量平均值，c 炉水或启动分离器出水铁含量平均值为炉水或启动分离器出水铁含量平均值，c 过热蒸汽铁含量平均值为过热蒸汽铁含量平均值。 c The average value of iron content in condensed water is the average value of iron content in condensed water, c The average value of iron content in feed water is the average value of iron content in feed water, c The average value of iron content in boiler water or starting separator water is the average value of iron content in boiler water or starting separator water Average value, c The average value of iron content in superheated steam is the average value of iron content in superheated steam.
进一步地，本公开实施例的火电机组停炉保护防锈蚀效果的评价方法还包括在启动阶段进行凝结水加氨和给水加氨的步骤。Further, the method for evaluating the anti-corrosion effect of thermal power unit shutdown protection and anti-corrosion according to the embodiments of the present disclosure also includes the steps of adding ammonia to condensed water and adding ammonia to feedwater during the start-up phase.
根据本公开实施例，通过在启动阶段随时进行凝结水加氨和给水加氨，并且机组的此次启动过程中不投运任何精处理设备，可以保证给水pH值控制在9.5±0.1，即电导率控制在6.8μS/cm～10.8μS/cm之间的范围内，对于启动过程中加药对水汽控制和精处理设备的规定，可以统一规范前提条件，便于对每种燃煤锅炉停用保护方法以及每次燃煤锅炉停用保护的防锈蚀效果进行横向比较，可以对比观察到同一种保护方法随着停用时间的变化，防锈蚀效果的变化，判断其保护的续航能力；也可以比对不同保护方法在相同停用时间内的保护效果，从而选择更优的保护方案，并且可以对保护方法进行进一步地优化，实用性强。According to the embodiment of the present disclosure, by adding ammonia to condensate water and feed water at any time during the start-up phase, and not putting any finishing equipment into operation during the start-up process of the unit, it can be ensured that the pH value of the feed water is controlled at 9.5±0.1, that is, the conductivity The rate is controlled within the range of 6.8μS/cm to 10.8μS/cm. For the regulations on water vapor control and fine treatment equipment during the start-up process, the preconditions can be unified and standardized, which is convenient for the shutdown protection of each coal-fired boiler. The method and the anti-corrosion effect of each coal-fired boiler shutdown protection are compared horizontally, and the same protection method can be compared and observed with the change of the shutdown time, the change of the anti-corrosion effect, and the endurance of its protection can be judged; it can also be compared Based on the protection effect of different protection methods in the same outage time, a better protection scheme can be selected, and the protection method can be further optimized, which has strong practicability.
图1是根据本公开实施例的评价装置工艺流程图，如图1所示，该火电机组停炉保护防锈蚀效果的评价装置可以包括：Fig. 1 is a process flow diagram of an evaluation device according to an embodiment of the present disclosure. As shown in Fig. 1, the evaluation device of the thermal power unit shutdown protection anti-corrosion effect may include:
选取模块100，用于在进行评价前，选取任意一种停炉保护方法对机组进行预设停炉时间的保护；The selection module 100 is used to select any one of the shutdown protection methods to protect the unit for a preset shutdown time before evaluation;
累积流量测量模块110，用于测量机组启动阶段凝结水泵出口的累积流量；The cumulative flow measurement module 110 is used to measure the cumulative flow at the outlet of the condensate pump during the start-up phase of the unit;
铁含量测量模块120，用于测量机组启动阶段与锅炉受热面相关水汽中的铁的质量含量，The iron content measurement module 120 is used to measure the mass content of iron in the water vapor related to the heating surface of the boiler during the start-up stage of the unit,
其中所述铁含量测量模块120包括计算单元，用于计算得到对应锅炉受热面相关水汽中的铁含量平均值；Wherein the iron content measurement module 120 includes a calculation unit for calculating the average value of the iron content in the water vapor corresponding to the heating surface of the boiler;
总铁含量计算模块130，用于根据累积流量和铁含量平均值，由预设的总铁量拟合式计算出机组启动阶段的总铁含量；和The total iron content calculation module 130 is used to calculate the total iron content at the start-up stage of the unit according to the cumulative flow and the average value of the iron content by a preset total iron content fitting formula; and
评价模块140，用于以总铁含量作为评价指标，对机组该次启动前的停炉保护防锈蚀效果进行评价。The evaluation module 140 is used to use the total iron content as an evaluation index to evaluate the anti-corrosion effect of the shutdown protection of the unit before the start-up.
本公开实施例中，所述累积流量测量模块110包括：In the embodiment of the present disclosure, the cumulative flow measurement module 110 includes:
第一阶段测量模块111，用于测量机组从凝结水泵启动后稳定运行开始至热态冲洗结束该阶段的第一累积流量；和The first-stage measurement module 111 is used to measure the first cumulative flow of the unit from the start of stable operation after the start of the condensate pump to the end of the hot state flushing; and
第二阶段测量模块112，用于测量机组从汽轮机冲转开始至汽轮发电机组并网该阶段的第二累积流量。The second stage measurement module 112 is used to measure the second cumulative flow of the unit from the start of the steam turbine run-in to the grid connection of the steam turbine generator set.
本公开实施例中，所述铁含量测量模块120包括：In the embodiment of the present disclosure, the iron content measurement module 120 includes:
第一测量模块121，用于测量凝结水铁含量；The first measurement module 121 is used to measure the iron content of the condensed water;
第二测量模块122，用于测量给水铁含量；The second measurement module 122 is used to measure the iron content of the feed water;
第三测量模块123，用于测量炉水或启动分离器出水铁含量；和The third measurement module 123 is used to measure the iron content in the furnace water or start the separator effluent; and
第四测量模块124，用于测量过热蒸汽铁含量。The fourth measurement module 124 is used to measure the iron content of the superheated steam.
本公开实施例中，计算单元还用于在检测周期内，根据锅炉受热面相关水汽中的铁含量计算铁含量算术平均值。In the embodiment of the present disclosure, the calculation unit is also used to calculate 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 within the detection period.
本公开实施例中，所述火电机组停炉保护防锈蚀效果的评价装置还包括在投运的凝结水加氨设备和给水加氨设备。In the embodiment of the present disclosure, the evaluation device for the protection and anti-corrosion effect of the thermal power unit shutdown further includes condensate water ammonia addition equipment and feedwater ammonia addition equipment that are in operation.
本公开实施例提出的方法和装置具体量化了火电机组燃煤锅炉停用保护防锈蚀效果的评价，可以采用最后得出的总铁含量的具体数据进行本机组的历次停用保护防锈蚀效果对比，也可以用于不同停用保护方法下的防锈蚀效果对比，也可以用于同类机组下的停用保护防锈蚀效果对比，这是一个能进行直接数据对比的评价方法；此外，本公开实施例提出的方法和装置对机组启动过程中水汽品质的监督有了更加明确具体的要求和监控，可以有章可循、有依可据。The method and device proposed in the embodiments of the present disclosure specifically quantify the evaluation of the anti-corrosion effect of the thermal power unit’s coal-fired boiler decommissioning protection, and the specific data of the total iron content finally obtained can be used to compare the anti-corrosion effects of the decommissioning protection of the unit , can also be used for comparison of anti-corrosion effects under different out-of-service protection methods, and can also be used for comparison of out-of-service protection and anti-corrosion effects under similar units. This is an evaluation method that can directly compare data; in addition, the implementation of the present disclosure The method and device proposed in this example have more specific and specific requirements and monitoring for the supervision of water vapor quality during the start-up process of the unit, and there are rules to follow and evidence to follow.
实施例1Example 1
本实施例1中选取某超超临界660MW直流炉对其进行停炉保护，燃煤锅炉停炉保护方法采用提高给水pH值的方法进行保护。在某次启动过程中，采用本公开实施例的评价方法及装置进行不同停炉保护时间下燃煤锅炉停用保护防锈蚀效果的评价，具体如下：In this embodiment 1, an ultra-supercritical 660MW DC furnace is selected for shutdown protection, and the coal-fired boiler shutdown protection method adopts the method of increasing the pH value of the feed water for protection. In a certain start-up process, the evaluation method and device of the embodiment of the present disclosure are used to evaluate the anti-corrosion effect of the coal-fired boiler shutdown protection under different shutdown protection times, as follows:
在启动过程中，不投运机组精处理高速混床，投运凝结水加氨设备和给水加氨设备，用于控制给水pH值维持在9.5±0.1之间，电导率控制在7.0μS/cm～10.0μS/cm之间；During the start-up process, the fine treatment high-speed mixed bed of the unit is not put into operation, and the condensate water ammonia addition equipment and the feed water ammonia addition equipment are put into operation to control the pH value of the feed water to maintain between 9.5±0.1 and the conductivity to be controlled at 7.0μS/cm ~10.0μS/cm;
从冷天冲洗至机组并网整个启动阶段过程中，每2小时以及在点火、冲转、并网的重要节点时取样检测各水汽水样中的铁含量等指标；During the entire start-up period from washing in cold weather to grid connection of the unit, samples are taken every 2 hours and at important nodes of ignition, flushing, and grid connection to detect the iron content and other indicators in each water vapor and water sample;
根据凝结水泵出口设置的累积流量计读取并记录凝结水的累计流量，直 至机组并网。Read and record the cumulative flow of condensate according to the cumulative flow meter set at the outlet of the condensate pump until the unit is connected to the grid.
第一次机组在停炉保护170日后重新启动过程，根据本公开实施例的评价方法得到的测量结果如下：The first time the unit restarted after 170 days of shutdown protection, the measurement results obtained according to the evaluation method of the embodiment of the present disclosure are as follows:
热态冲洗结束时，凝结水泵出口的累计流量为9014t；At the end of hot flushing, the cumulative flow at the outlet of the condensate pump is 9014t;
凝结水铁含量平均值为111.8μg/L；The average iron content in condensate is 111.8μg/L;
给水铁含量平均值为82μg/L；The average iron content in feed water is 82μg/L;
启动分离器出水铁含量平均值为102.1μg/L；The average iron content in the effluent from the separator is 102.1 μg/L;
汽轮机冲转阶段至并网时，凝结水泵出口的累计流量为3765t；From the stage of steam turbine running to grid connection, the cumulative flow at the outlet of the condensate pump is 3765t;
过热蒸汽铁含量平均值为30.3μg/L；The average iron content of superheated steam is 30.3μg/L;
根据本公开实施例提供的拟合式计算得到总铁含量为2781.3kg。According to the fitting formula provided by the embodiment of the present disclosure, the total iron content is calculated to be 2781.3kg.
第二次机组在停炉保护8日后重新启动过程，根据本公开实施例的评价方法得到的测量结果如下：The second unit restarted the process after 8 days of shutdown protection, and the measurement results obtained according to the evaluation method of the embodiment of the present disclosure are as follows:
热态冲洗结束时，凝结水泵出口的累计流量为7514t；At the end of hot flushing, the cumulative flow at the outlet of the condensate pump is 7514t;
凝结水铁含量平均值为24μg/L；The average iron content in condensate is 24μg/L;
给水铁含量平均值为9.5μg/L；The average iron content in feed water is 9.5μg/L;
启动分离器出水铁含量平均值为12.5μg/L；The average iron content in the effluent from the separator is 12.5 μg/L;
汽轮机冲转阶段至并网时，凝结水泵出口的累计流量为5327t；From the stage of steam turbine running to grid connection, the cumulative flow at the outlet of the condensate pump is 5327t;
过热蒸汽铁含量平均值为5.5μg/L；The average iron content of superheated steam is 5.5μg/L;
根据本公开实施例提供的拟合式计算得到总铁含量为375.0kg。According to the fitting formula provided by the embodiment of the present disclosure, the total iron content is calculated to be 375.0 kg.
根据评价结果可以观察到，明显的，机组在长时间的停炉时间内的腐蚀量比在较短的停炉时间内的腐蚀量高的多，说明本公开实施例提出的方法可以更加直观的认识停用保护的防锈蚀效果，也可以据此对停炉保护的方法进行改进。According to the evaluation results, it can be observed that obviously, the corrosion amount of the unit during a long shutdown time is much higher than that during a shorter shutdown time, which shows that the method proposed in the embodiment of the present disclosure can be more intuitive Knowing the anti-corrosion effect of out-of-service protection can also improve the method of out-of-service protection.
实施例2Example 2
我国某超超临界660MW直流炉，燃煤锅炉在前后两次的停炉中分别采用充氮气保护和提高给水pH值保护。在两次停用保护后的启动过程中，均采用本方法进行燃煤锅炉停用保护防锈蚀效果的评价：在启动过程中，不投运机组精处理高速混床，投运凝结水加氨设备和给水加氨设备，保障给水pH控制在9.5±0.1之间，电导率控制7.0μS/cm～10.0μS/cm之间；从冷天冲洗至机组并网过程中，每2小时以及点火、冲转、并网的重要节点时取样检测各水汽水样中的铁含量等指标，同时记录凝结水的累计流量，直至机组并网。In an ultra-supercritical 660MW DC furnace in my country, the coal-fired boiler was protected by nitrogen filling and by increasing the pH value of the feed water during the two shutdowns. In the start-up process after two out-of-service protections, this method is used to evaluate the anti-corrosion effect of coal-fired boiler out-of-service protection: equipment and feedwater ammonia addition equipment, to ensure that the pH of the feedwater is controlled between 9.5±0.1 and the conductivity is controlled between 7.0μS/cm and 10.0μS/cm; Sampling and detection of iron content and other indicators in each water vapor and water sample at the important nodes of flushing and grid connection, and at the same time record the cumulative flow of condensed water until the unit is connected to the grid.
采用充氮气保护方法：机组在停炉保护约179日后启动过程：热态冲洗结束时，凝结水泵出口的累计流量为8173t，凝结水铁含量平均值为86.9μg/L，给水铁含量平均值为71.3μg/L，启动分离器出水铁含量平均值为80.9μg/L；汽轮机冲转阶段至并网时，凝结水泵出口的累计流量为3019t，过热蒸汽铁含量平均值为26.1μg/L。根据本方法中提出的拟合式得出总铁量为2033.0kg。Nitrogen gas protection method is used: the unit starts after about 179 days of shutdown protection: at the end of hot flushing, the cumulative flow at the outlet of the condensate pump is 8173t, the average iron content of the condensate is 86.9μg/L, and the average iron content of the feed water is 71.3μg/L, the average iron content of the effluent from the separator is 80.9μg/L; when the steam turbine is running and connected to the grid, the cumulative flow at the outlet of the condensate pump is 3019t, and the average iron content of the superheated steam is 26.1μg/L. According to the fitting formula proposed in this method, the total iron content is 2033.0kg.
采用提高给水pH值保护方法：机组在停炉保护170日后启动过程：热态冲洗结束时，凝结水泵出口的累计流量为9014t，凝结水铁含量平均值为111.8μg/L，给水铁含量平均值为82μg/L，启动分离器出水铁含量平均值为102.1μg/L；汽轮机冲转阶段至并网时，凝结水泵出口的累计流量为3765t，过热蒸汽铁含量平均值为30.3μg/L。根据本方法中提出的拟合式得出总铁量为2781.3kg。The protection method of increasing the pH value of the feed water is adopted: the unit starts up after 170 days of shutdown protection: at the end of the hot state flushing, the cumulative flow at the outlet of the condensate pump is 9014t, the average iron content of the condensate is 111.8μg/L, and the average iron content of the feed water 82μg/L, and the average iron content in the effluent from the separator is 102.1μg/L; when the steam turbine is running and connected to the grid, the cumulative flow at the outlet of the condensate pump is 3765t, and the average iron content in the superheated steam is 30.3μg/L. According to the fitting formula proposed in this method, the total iron content is 2781.3kg.
根据评价结果可以观察到，明显的，同一机组在同样停炉时间内采用充氮气停炉保护方法的腐蚀量比提高给水pH值停炉保护方法的腐蚀量少，表 示充氮气停炉保护方法对停炉保护防锈蚀效果更佳，本公开实施例提出的方法也可以用于不同停炉保护方法下的防锈蚀效果对比，从而选出更优的停炉保护方法。According to the evaluation results, it can be observed that, obviously, the corrosion amount of the same unit using the nitrogen filling shutdown protection method is less than that of increasing the feed water pH value in the same shutdown time, indicating that the nitrogen filling shutdown protection method is more effective. The anti-corrosion effect of the furnace shutdown protection is better, and the method proposed in the embodiment of the present disclosure can also be used to compare the anti-corrosion effects of different furnace shutdown protection methods, so as to select a better furnace shutdown protection method.
以上所述仅为本公开的具体实施方式，但本公开的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本公开揭露的技术范围内，可轻易想到变化或替换,都应涵盖在本公开的保护范围之内。The above is only a specific implementation of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope of the present disclosure, and should within the protection scope of the present disclosure.
本公开所有实施例均可以单独被执行，也可以与其他实施例相结合被执行，均视为本公开要求的保护范围。All the embodiments of the present disclosure can be implemented independently or in combination with other embodiments, which are all regarded as the scope of protection required by the present disclosure.

Claims (10)

  1. 一种火电机组停炉保护防锈蚀效果的评价方法，包括：A method for evaluating the anti-corrosion effect of thermal power unit shutdown protection, comprising:
    测量机组启动阶段凝结水泵出口的累积流量；Measure the cumulative flow at the outlet of the condensate pump during the start-up phase of the unit;
    测量所述机组所述启动阶段与锅炉受热面相关水汽中铁的质量含量，计算得到对应所述锅炉受热面相关水汽中的铁含量平均值；Measuring the mass content of iron in the water vapor related to the heating surface of the boiler during the start-up phase of the unit, and calculating the average value of the iron content in the water vapor corresponding to the heating surface of the boiler;
    根据所述累积流量和所述铁含量平均值，由预设的总铁量拟合式计算出所述机组所述启动阶段的总铁含量；和According to the cumulative flow and the average value of the iron content, the total iron content in the start-up stage of the unit is calculated by a preset total iron content fitting formula; and
    以所述总铁含量作为评价指标，对所述机组该次启动前的停炉保护防锈蚀效果进行评价。Taking the total iron content as an evaluation index, the anti-corrosion effect of the shutdown protection of the unit before the start-up is evaluated.
  2. 根据权利要求1所述的火电机组停炉保护防锈蚀效果的评价方法，其中，所述测量机组启动阶段凝结水泵出口的累积流量，包括：The evaluation method of thermal power unit shutdown protection anti-corrosion effect according to claim 1, wherein the cumulative flow at the outlet of the condensate pump at the start-up stage of the measuring unit comprises:
    测量所述机组从所述凝结水泵启动后稳定运行开始至热态冲洗结束该阶段的第一累积流量；和Measuring the first cumulative flow of the unit from the start of stable operation after the condensate pump is started to the end of hot flushing; and
    测量所述机组从汽轮机冲转开始至汽轮发电机组并网该阶段的第二累积流量。The second cumulative flow of the unit is measured from the start of the steam turbine rushing to the grid connection of the steam turbine generator set.
  3. 根据权利要求1或2所述的火电机组停炉保护防锈蚀效果的评价方法，其中，所述测量所述机组所述启动阶段与锅炉受热面相关水汽中的铁的质量含量，包括：凝结水铁含量、给水铁含量、炉水或启动分离器出水铁含量、过热蒸汽铁含量。According to claim 1 or 2, the evaluation method of thermal power unit shutdown protection and anti-corrosion effect, wherein said measurement of the mass content of iron in the water vapor related to the heating surface of the boiler during the start-up stage of the unit includes: condensed water Iron content, iron content in feed water, iron content in boiler water or starting separator effluent, iron content in superheated steam.
  4. 根据权利要求1至3中任一项所述的火电机组停炉保护防锈蚀效果的评价方法，其中，所述计算得到对应所述锅炉受热面相关水汽中的铁含量平均值包括：在检测周期内，根据所述锅炉受热面相关水汽中的所述铁的质量 含量计算得到所述铁含量平均值。According to the evaluation method of thermal power unit shutdown protection anti-corrosion effect according to any one of claims 1 to 3, wherein said calculating and obtaining the average value of iron content in water vapor corresponding to said boiler heating surface comprises: The average value of the iron content is calculated according to the mass content of the iron in the water vapor related to the heating surface of the boiler.
  5. 根据权利要求1至4中任一项所述的火电机组停炉保护防锈蚀效果的评价方法，其中，所述预设的总铁量拟合式为：According to the evaluation method of thermal power unit shutdown protection anti-corrosion effect according to any one of claims 1 to 4, wherein the preset total iron amount fitting formula is:
    M 总铁量＝V 热态冲洗结束时×c 凝结水铁含量平均值+V 热态冲洗结束时×c 给水铁含量平均值+V 热态冲洗结束时×c 炉水或启动分离器出水铁含量平均值+V 汽轮机冲转阶段至并网时×c 过热蒸汽铁含量平均值， M total iron content = V at the end of hot flushing × c average value of iron content in condensate + V at the end of hot flushing × c average value of iron content in feed water + V at the end of hot flushing × c boiler water or start-up separator outlet water iron The average value of content + V from the stage of steam turbine rushing to grid connection × c average value of iron content in superheated steam ,
    其中，M 总铁量为机组启动阶段的总铁含量，V 热态冲洗结束时为机组从凝结水泵启动后稳定运行开始至热态冲洗结束该阶段的第一累积流量，V 汽轮机冲 转阶段至并网时为机组从汽轮机冲转开始至汽轮发电机组并网该阶段的第二累积流量， Among them, M total iron content is the total iron content in the start-up stage of the unit, V at the end of the hot state flushing is the first cumulative flow rate of the unit from the start of the stable operation of the condensate pump to the end of the hot state flushing, and the V steam turbine running stage to When connected to the grid, it is the second cumulative flow of the unit from the start of the steam turbine to the grid connection of the steam turbine generator set.
    c 凝结水铁含量平均值为凝结水铁含量平均值，c 给水铁含量平均值为给水铁含量平均值，c 炉水或启动分离器出水铁含量平均值为炉水或启动分离器出水铁含量平均值，c 过热蒸汽铁含量平均值为过热蒸汽铁含量平均值。 c The average value of iron content in condensed water is the average value of iron content in condensed water, c The average value of iron content in feed water is the average value of iron content in feed water, c The average value of iron content in boiler water or starting separator water is the average value of iron content in boiler water or starting separator water Average value, c The average value of iron content in superheated steam is the average value of iron content in superheated steam.
  6. 根据权利要求1至5中任一项所述的火电机组停炉保护防锈蚀效果的评价方法，其中，所述方法还包括在所述启动阶段进行凝结水加氨和给水加氨的步骤。The method for evaluating the anti-corrosion effect of thermal power unit shutdown protection according to any one of claims 1 to 5, wherein the method further includes the steps of adding ammonia to condensed water and ammonia to feedwater during the start-up phase.
  7. 一种火电机组停炉保护防锈蚀效果的评价装置，其中，基于如权利要求1至6中任一项所述的火电机组停炉保护防锈蚀效果的评价方法，包括：An evaluation device of thermal power unit shutdown protection anti-corrosion effect, wherein, based on the evaluation method of thermal power unit shutdown protection anti-corrosion effect as described in any one of claims 1 to 6, comprising:
    累积流量测量模块(110)，用于测量机组启动阶段凝结水泵出口的累积流量；A cumulative flow measurement module (110), used to measure the cumulative flow at the outlet of the condensate pump during the start-up phase of the unit;
    铁含量测量模块(120)，用于测量所述机组所述启动阶段与所述锅炉受热面相关水汽中的铁的质量含量，An iron content measurement module (120), used to measure the mass content of iron in the water vapor associated with the heating surface of the boiler during the start-up phase of the unit,
    其中所述铁含量测量模块(120)包括计算单元，用于计算得到对应所述锅炉受热面相关水汽中的铁含量平均值；Wherein the iron content measurement module (120) includes a calculation unit, which is used to calculate and obtain the average iron content in the water vapor corresponding to the heating surface of the boiler;
    总铁含量计算模块(130)，用于根据所述累积流量和所述铁含量平均值，由预设的总铁量拟合式计算出所述机组所述启动阶段的总铁含量；和A total iron content calculation module (130), configured to calculate the total iron content of the unit during the start-up phase from a preset total iron content fitting formula according to the cumulative flow and the average value of the iron content; and
    评价模块(140)，用于以所述总铁含量作为评价指标，对所述机组该次启动前的停炉保护防锈蚀效果进行评价。An evaluation module (140), configured to use the total iron content as an evaluation index to evaluate the effect of shutdown protection and anti-corrosion of the unit before this startup.
  8. 根据权利要求7所述的火电机组停炉保护防锈蚀效果的评价装置，其中，所述累积流量测量模块(110)包括：The evaluation device for thermal power unit shutdown protection anti-corrosion effect according to claim 7, wherein the cumulative flow measurement module (110) includes:
    第一阶段测量模块(111)，用于测量所述机组从所述凝结水泵启动后稳定运行开始至热态冲洗结束该阶段的第一累积流量；和The first-stage measurement module (111) is used to measure the first cumulative flow of the unit from the start of stable operation after the start of the condensate pump to the end of hot flushing; and
    第二阶段测量模块(112)，用于测量所述机组从汽轮机冲转开始至汽轮发电机组并网该阶段的第二累积流量。The second-stage measurement module (112) is used to measure the second cumulative flow of the unit from the start of the steam turbine run-in to the grid connection of the steam turbine generator set.
  9. 根据权利要求7或8所述的火电机组停炉保护防锈蚀效果的评价装置，其中，所述铁含量测量模块(120)包括：According to claim 7 or 8, the thermal power unit shutdown protection anti-corrosion evaluation device, wherein, the iron content measurement module (120) includes:
    第一测量模块(121)，用于测量凝结水铁含量；The first measuring module (121), is used for measuring the iron content of condensed water;
    第二测量模块(122)，用于测量给水铁含量；The second measuring module (122), is used for measuring the iron content of feed water;
    第三测量模块(123)，用于测量炉水或启动分离器出水铁含量；和The third measuring module (123), is used for measuring boiler water or starts the iron content of separator effluent; and
    第四测量模块(124)，用于测量过热蒸汽铁含量。The fourth measuring module (124) is used for measuring the iron content of the superheated steam.
  10. 根据权利要求7至9中任一项所述的火电机组停炉保护防锈蚀效果的评价装置，其中，所述装置还包括凝结水加氨设备和给水加氨设备。The device for evaluating the anti-corrosion effect of thermal power unit shutdown protection according to any one of claims 7 to 9, wherein the device further includes condensate ammonia addition equipment and feedwater ammonia addition equipment.
PCT/CN2022/129680 2021-11-10 2022-11-03 Method and apparatus for assessing boiler lay-up protection anti-corrosion effect of thermal power unit WO2023083099A1 (en)

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