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Microfluidization cold-state ignition starting method for circulating fluidized bed boiler

A circulating fluidized bed, ignition start-up technology, which is applied to fluidized bed combustion equipment, combustion methods, fuels burned in a molten state, etc., can solve the problems of large bed temperature deviation, long start-up time, and slow temperature rise of bed materials. Achieve the effects of short ignition time, low starting fuel consumption and low inlet oil pressure

Inactive Publication Date: 2021-06-25
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, in order to solve the above-mentioned problems existing in the prior art, the object of the present invention is to provide a microfluidization cold-state ignition start-up method for a circulating fluidized bed boiler so as to solve the problem of slow bed material temperature rise and large bed temperature deviation. , long start-up time, high fuel consumption, etc., effectively avoiding coking in the furnace, damage to the ignition burner and other operating accidents, thereby greatly improving the safety and economy of cold-state ignition of circulating fluidized bed boilers

Method used

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  • Microfluidization cold-state ignition starting method for circulating fluidized bed boiler

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Embodiment 1

[0031] In this embodiment, a microfluidization cold-state ignition start-up method for a circulating fluidized bed boiler is specifically provided. , particle size distribution, coal feeding method and other aspects, optimize the design of fluidization state, combustion concept and new operation control mode of boiler cold ignition start, which can well solve the problems existing in the original ignition start method and effectively avoid boiler ignition Operation accidents such as coking in the furnace, damage to the ignition burner, and deformation of the heating surface during the process greatly improve the safety and economical efficiency of the cold ignition start-up of the circulating fluidized bed boiler.

[0032] Specifically, the startup method includes:

[0033] S1: Test whether the ignition conditions are met, if yes, go to the next step; if not, return to debugging; among them, the judgment of whether the ignition conditions are met is as follows:

[0034] It is...

Embodiment 2

[0049] Taking the treatment of a 330MW subcritical circulating fluidized bed boiler in China as an example for the "coking accident at ignition start-up", after the efficiency improvement of the boiler, during the first cold ignition start-up process, the bed temperature deviation was large and the temperature rise was slow, and the operating personnel Increase the fluidization air volume and increase the inlet oil pressure, and the bed temperature rises slowly. After a long period of time, the bed temperature reaches the coal feeding condition, and the coal feeding starts intermittently. Due to the mismatch between the combustion air volume and the coal feeding volume, the coal in the furnace does not completely ignite and burn. , causing a large amount of unburned carbon to accumulate in the furnace. As the bed temperature rises, the unburned carbon in the furnace, the coal fired into the furnace, and the fuel oil burn together, resulting in a rapid rise in the bed temperature...

Embodiment 3

[0052] Take a 350MW supercritical circulating fluidized bed boiler in China as an example. During the cold ignition start-up process of the boiler during the trial operation stage, the bed temperature difference between the front wall and the back wall of the furnace is extremely large (>300°C), the bed temperature rises very slowly, the primary fluidization air volume is large (completely fluidized state), and the fuel oil The pressure (3.2MPa) is high, the output of the oil gun is large (6-7t / h), and the bed temperature is difficult to reach the coal injection temperature. It is difficult to inject coal into the guide, and the oil gun cannot be removed for a long time, resulting in a particularly long time for the entire ignition process ( 6~7h), the oil gun is very high (>80t).

[0053] The power plant began to think that there was a problem with the boiler design. Through cause analysis and technical exchanges, it was suggested that the power plant adopt the ignition start...

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Abstract

The invention discloses a microfluidization cold-state ignition starting method for a circulating fluidized bed boiler, and belongs to the technical field of energy power. The starting method comprises the following steps: S1, testing whether an ignition condition is met or not, if yes, entering the next step, and if not, returning to debug; S2, igniting through an oil gun to heat a bed layer; S3, according to different initial coal feeding temperatures of ignition of different coal types, after the bed layer is heated to a preset temperature, starting intermittent coal feeding, wherein in the coal feeding process, the oil pressure of the oil gun is gradually reduced along with the increase of the coal feeding amount; and S4, when the temperature of the bed layer reaches 630-670 DEG C, starting to withdraw the oil gun, and when the temperature of the bed layer reaches 780-820 DEG C, removing the whole oil gun. Therefore, the problems of slow temperature rise of bed materials, large bed temperature deviation, long starting time, high oil consumption and the like can be well solved, operation accidents such as hearth coking and ignition burner damage are effectively avoided, and then the safety and economical efficiency of cold ignition starting of the circulating fluidized bed boiler are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of energy and power, and specifically relates to a microfluidization cold-state ignition start method for a circulating fluidized bed boiler. Background technique [0002] Circulating fluidized bed (CFB) boilers have been rapidly developed and widely used in China due to many advantages such as wide fuel adaptability, low original pollutant emission concentration, and low-load stable combustion characteristics. The circulating fluidized bed (CFB) boilers put into commercial operation CFB) has a large number of boiler units. [0003] For the CFB boiler units that have been put into operation, due to factors such as equipment and power grids, multiple startups of the unit are inevitable. At present, many boiler operators in power plants are in the process of unit startup. Due to the limited cognition of circulating fluidized bed boiler technology, Inaccurate boiler equipment manuals, insufficient actual opera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/28
CPCF23C10/28
Inventor 郑兴胜吴朝刚李果郭强周棋李维成周龙龙
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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