On-line monitoring method for heat efficiency of boiler based on coal quality database

Abstract

The invention provided an on-line monitoring method for heat efficiency of a boiler based on a coal quality database. The method includes seeking the internal mapping relationship between coal heating value and coal composition by establishing the coal quality database, acquiring the coal composition by the database according to calculated coal heating value, and calculating the heat efficiency. Specifically, the method includes according to real-time output heat of the boiler during operation and coal supplying amount of the boiler, heat efficiency of the boiler is assumed, and lower heating value of fuels is acquired; lower heating values of various coals collected in the database are compared with the lower heating value of the fuels to locate the coal having consistent lower heating value with that of the fuels, real-time calculating of efficiency of the boiler is performed according to elemental analysis of the coal, the calculated efficiency of the boiler is compared with the assumed value, and if the calculated efficiency and the assumed value are within a certain error range, the calculated efficiency of the boiler is determined; and if the error is large, the assumed value is replaced by the calculated value, and iteration is performed until the error reaches an allowed range.

Description

technical field [0001] The invention belongs to the technical field of boiler testing, in particular to an online monitoring method for boiler thermal efficiency based on a coal quality database. technical background [0002] At present, most boiler efficiency calculations use GB10184-88 (DL / T 964-2005 is also required for circulating fluidized bed boilers) or ASME PTC4.1 promulgated by the American Society of Mechanical Engineers, which is commonly used internationally. The measurement accuracy of these two calculation methods High, but due to the need for laboratory analysis, online calculation cannot be realized, and boiler operators cannot be guided in real time to make adjustments to achieve the purpose of saving energy. [0003] The biggest obstacle restricting the online calculation of boiler efficiency is that the quality of coal-fired coal needs to be obtained through laboratory tests. Due to the influence of various conditions, the online analysis of coal-fired com...

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Problems solved by technology

[0002] At present, most boiler efficiency calculations use GB10184-88 (DL / T 964-2005 is also required for circulating fluidized bed boilers) or ASME PTC4.1 promulgated by the American Society of Mechanical Engineers, which is commonly used internationally. The measurement accuracy of these two calculation methods High, but due to the need for laboratory analysis, online calculation cannot be realized, and boiler operators cannot be guided in real time to make adjustments to achieve the purpose of saving energy

[0003] The biggest obstacle restricting the online calculation of boiler efficiency is that the quality of coal-fired coal needs to be obtained through laboratory tests. Due to the influence of various conditions, the online analysis of coal-fired composition has large errors and cannot be popularized and applied.

At present, it is mainly calculated based on the coal-fired industrial composition or coal-fired combustion products. The online calculation based on the coal-fired industrial composition is still subject to the timeliness of the industrial composition analysis. The calculation based on the combustion products is mainly based on carbon balance, and ignores the coal-fired industrial composition The error is still large due to the influence of other heat-generating elements and other chemical reactions absorbing and exothermic

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