Method for relieving boiler slagging by using fly ash circulation

A fly ash and boiler technology, which is applied in the field of using fly ash circulation to alleviate boiler slagging, can solve problems such as boiler slagging that cannot be fundamentally solved

Active Publication Date: 2012-10-31
XI AN JIAOTONG UNIV
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Problems solved by technology

However, due to the variability of coal quality in actual power stations, such methods cannot fundamentally solve boiler slagging

Method used

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  • Method for relieving boiler slagging by using fly ash circulation

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Embodiment Construction

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0018] see figure 1 , the method of the present invention is as follows:

[0019] 1) Coal-fired fly ash detection: detect coal-fired fly ash, if SiO in coal-fired fly ash 2 / Al 2 o 3 When the value is 1.87~3.0 or the softening temperature ST of coal-fired fly ash is below 1350°C, then add fly ash to the raw coal; otherwise, no fly ash is added to the raw coal;

[0020] 2) Determine the amount of fly ash mixed: according to the SiO in coal-fired fly ash 2 / Al 2 o 3 Select the amount of fly ash mixed with the value of , that is, the amount of fly ash mixed into raw coal;

[0021] 3) If the fuel thermal analysis test after blending fly ash shows that the ignition temperature delay after blending does not exceed 25°C, and the softening temperature ST of the ash formed after blending fly ash is not lower than 1350°C, then the blending The amount of blended...

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Abstract

The invention relates to a method for relieving boiler slagging by using fly ash circulation, aiming at solving the problem of the traditional large power station boiler slagging, i.e. a certain amount of fly ash and coal dust being mixed and then sent to a hearth so as to achieve the purpose of relieving the boiler slagging. Researches find that the fly ash contains higher contents of SiO2 and Al2O3, and the fly ash and the coal dust are mixed in certain proportions to relieve the boiler slagging. Whether the method can be used or not is determined according to a value of the silica-alumina ratio of SiO2 to Al2O3 in the fly ash and the ash fusion softening temperature ST of the fly ash. In order to guarantee that the fly ash does not have a strong impact on fire-catching timeliness of the coal dust in the hearth and to relieve the slagging process at the same time, the amount of the mixed fly ash is determined according to the value of SiO2 to Al2O3 in the fly ash. The method can relieve the boiler slagging, and is economical and simple and convenient to operate.

Description

technical field [0001] The invention belongs to the field of energy saving and emission reduction, and relates to a method for alleviating boiler slagging by utilizing fly ash circulation. Background technique [0002] At present, my country's power plant boilers are mainly coal, which accounts for more than 80% of the cost of power plants. In order to seek better economic benefits, power plants often use low-quality coal, but low-quality coal is easy to cause boiler slagging. Boiler slagging generally occurs on the furnace wall, water wall or pipes. When the ash melting point is low, the melted or partially melted particles carried by the flue gas will be cooled and solidified on the heating surface to cause slagging. Once the boiler slagging occurs, on the one hand, it will increase the total heat transfer resistance and reduce the heat transfer capacity of the heating surface in the furnace; reaction, forming high temperature corrosion. [0003] At present, the problem ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23K1/00F23N1/00
Inventor 谭厚章张利孟王学斌王新民杜文智刘原一
Owner XI AN JIAOTONG UNIV
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