Coal-fired boiler coal quality on-line soft measurement method and system

Abstract

The invention discloses a coal-fired boiler coal quality on-line soft measurement method and system. The coal-fired boiler coal quality on-line soft measurement method includes the steps of (S100) the contents of the as received basis ash content Aar, the dry ash-free basis elemental carbon Cdaf and the dry ash-free basis elemental sulphur Sdaf are assumed; (S200) the uncompleted burned carbon consumption correction amount TCucr, the oxygen volume VO2-daf, the nitrogenn volume VN2-daf and CO2 volume gamma CO2, CO2 and SO2 gross capacity VRO2-daf are calculated according to the contents; (S300) iteration solving is carried out on the dry ash-free basis sulphur calculation value Sdafj, the dry ash-free basis carbon calculation value Cdafj and the fuel low-level heating amount calculation value Qarj according to the calculation values in the step (S200), and the values are output. Coal quality on-line soft measurement is achieved through the adoption of fire coal moisture on-line measurement information, boiler smoke data and unit running state data.

Description

technical field [0001] The invention relates to an online soft measurement method and measurement system for coal quality of a coal-fired boiler, which can realize online analysis of moisture, ash content, calorific value and elements of coal burned by the coal-fired boiler, and belongs to the cross field of power equipment and information technology. Background technique [0002] Coal quality is an important basic information for the operation of coal-fired power plants. The quality of coal in my country's coal-fired power plants generally changes frequently, and accurate online measurement of coal quality is still a technical problem in the power industry. There are still some problems such as low-level problems, and the discharge of pollutants exceeds the standard. There is still a certain gap in the overall operation technology level of the unit compared with foreign units of the same type. Therefore, it is necessary to study and improve the coal quality online measureme...

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Problems solved by technology

[0004] The results of literature search show that Chinese patent 201010204537.1 discloses a method for real-time calculation of coal quality elements and industrial components, using standard coal consumption for power generation and boiler efficiency to back-calculate the calorific value of coal into the furnace, but due to the large difference between standard coal consumption for power generation and coal quality Correlation, and the method of correcting the element composition with low calorific value has a large error, so this calculation method is difficult to guarantee the accuracy of the result

Chinese patent 02110116.7 discloses a method and device for real-time monitoring of coal quality in power plant boilers, but in the calculated heat balance equation of the intermediate coal mill, an important formula adopted is coal pulverized coal moisture at the outlet of the coal mill = 0.048Mar×R90 / t2 (Mar: received base moisture, R90: pulverized coal fineness t2: coal pulverizer outlet temperature) is the calculation method of fan coal pulverizers in Russia. After actual measurement and verification, more medium-speed coal pulverizers are used in power plants in my country Not applicable, for this reason, the method of obtaining raw coal moisture by using coal mill heat balance has great limitations

Chinese patent 201110358714.6 discloses a coal ash and moisture measurement method, in which a large number of fitting formulas are used in the calculation, and the theoretical dry air volume, exhaust heat loss, actual flue gas quality, etc. are fitted to the calorific value of the fuel , thus simplifying the calculation and performing iterative solution, but this calculation method is not based on the calculation method of fuel combustion chemical balance, the fitting error is large, the scope of application has certain limitations, and this calculation method cannot obtain elemental analysis

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