Evaluation method and device for boiler shutdown protection anti-corrosion effect of thermal power generating unit

A technology for boiler shutdown protection and thermal power units, applied in the direction of measuring devices, instruments, data processing applications, etc., can solve the problems of inability to evaluate the anti-corrosion effect of coal-fired boiler shutdown protection, inability to grasp the anti-corrosion situation of the water vapor system of coal-fired boilers, and inability to To characterize issues such as coal-fired boiler outage protection methods, to achieve intuitive and clear results, simple device structure, and a wide range of applications

Pending Publication Date: 2022-02-11
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 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

Method used

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  • Evaluation method and device for boiler shutdown protection anti-corrosion effect of thermal power generating unit
  • Evaluation method and device for boiler shutdown protection anti-corrosion effect of thermal power generating unit
  • Evaluation method and device for boiler shutdown protection anti-corrosion effect of thermal power generating unit

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Embodiment 1

[0086] 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 present invention are used to evaluate the anti-corrosion effect of coal-fired boiler shutdown protection under different shutdown protection times, as follows:

[0087] 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;

[0088] 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 importan...

Embodiment 2

[0108]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 testing the iron content and other indicators in the water vapor and water samples 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.

[0109] 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 c...

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Abstract

The invention provides an evaluation method and device for the boiler shutdown protection anti-corrosion effect of a thermal power generating unit. Operation is easy, implementation is easy, the anti-corrosion condition in a huge coal-fired boiler water vapor system pipeline in the boiler shutdown protection state can be effectively mastered, and whether the currently-adopted coal-fired boiler shutdown protection method is reliable and effective or not is judged. The evaluation method for the boiler shutdown protection anti-corrosion effect of the thermal power generating unit comprises the steps that the accumulated flow of a condensate pump outlet in the unit starting stage is measured; the mass content of iron in the water vapor related to the boiler heating surface in the unit starting stage is measured, and calculation is performed to obtain the average value of the iron content in the water vapor related to the boiler heating surface; according to the accumulated flow and the iron content average value, the total iron content of the unit in the starting stage is calculated through a preset total iron amount fitting formula; and the total iron content is used as an evaluation index to evaluate the blowing-out protection anti-corrosion effect of the unit before the unit is started at the time.

Description

technical field [0001] The invention belongs to the technical field of boiler corrosion protection, and in particular relates to an evaluation method and device for the anti-corrosion effect of thermal power unit shutdown protection. Background technique [0002] 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 outage protection of coal-fired boilers of thermal power units are becoming more and more stringent, in order to prevent a large amount of corrosion of coal-fired boilers during the outage period, 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06Q10/06G01N33/00
CPCG06F30/20G06Q10/06393G01N33/00
Inventor 杨俊宋飞舒进乔越刘炎伟曹松彦贾明祥王彤蒋昊朱慧强
Owner XIAN THERMAL POWER RES INST CO LTD
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