Method for monitoring thermal efficiency and coal quality data of pulverized coal fired boiler in real time

Abstract

The invention relates to a method for monitoring thermal efficiency and coal quality data of a pulverized coal fired boiler in real time. A digital model for monitoring the thermal efficiency of a pulverized coal fired boiler system in real time is established to obtain an excess air coefficient, theoretical air volume of a fuel, theoretical nitrogen volume of a combustion product, flue gas carbon dioxide, carbon monoxide, sulfur dioxide, dry flue gas volume, volume difference between theoretical oxygen demand of full coal combustion and practical combustion oxygen consumption, mass percentage of coal as received basis machinery unburned carbon, mass percentage of coal generated carbon dioxide as received basis carbon, mass percentage of coal generated carbon monoxide as received basis carbon, mass percentage of coal as received basis; densities of carbon, hydrogen, oxygen, nitrogen, sulfur, ash, water and flue gas, flow speed of flue gas in air preheater, lower heating value of coal,heat loss due to exhaust smoke, heat loss due to chemical incomplete combustion, heat loss due to mechanical incomplete combustion, radiating heat loss, ash residue physic heat loss, boiler thermal efficiency, mass percentage of carbon in fly ash and coal combustion. The method has the characteristics that: the method is scientific and reasonable, monitors data correctly, and the like.

Description

technical field [0001] The invention relates to the technical field of energy saving of coal-fired boilers, and relates to a method for real-time monitoring of thermal efficiency and coal quality data of pulverized coal boilers. Background technique [0002] The national standard "GB10184-88 Power Station Boiler Performance Test Regulations" discloses the calculation method of the thermal efficiency of pulverized coal boilers as follows: [0003] Relationship between Thermal Efficiency and Heat Loss of Pulverized Coal Boiler [0004] Boiler thermal efficiency η b (%) is calculated by formula (1) [0005] n b =100-(q 2 +q 3 +q 4 +q 5 +q 6 ) (1) [0006] Among them, q 2 ,q 3 ,q 4 ,q 5 ,q 6 They are exhaust heat loss (%) of pulverized coal boiler, chemical unburned heat loss (%), mechanical unburned heat loss (%), boiler heat loss (%), and ash physical heat loss (%). [0007] Exhaust heat loss q 2 (%) is calculated by formula (2) [0008] ...

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Problems solved by technology

However, some of the parameters used in the calculation of boiler thermal efficiency can only be obtained after 4 to 5 hours of sampling and testing, for example h ar , O ar , N ar , S ar 、A ar , W ar 、C hz , Q net , therefore, there are still unresolved difficulties in the prior art, so that the real-time monitoring of the optimal operation adjustment of the boiler has not yet been realized

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