Method for calculating thermal efficiency of coal dust and blast furnace gas co-combustion boiler

Abstract

The invention discloses a method for calculating thermal efficiency of a coal dust and blast furnace gas co-combustion boiler. The method is designed against the problem that in configuration in the prior art, boilers of storage type coal pulverizing systems cannot accurately obtain the boiler inlet coal quantity under the corresponding working conditions when the thermal efficiency of the boilers is calculated. The method for calculating the thermal efficiency comprises the steps of collection and measurement of relevant parameters, fire coal combustion calculation, gas combustion calculation, boiler inlet quantity calculation, boiler inlet coal quantity calculation, input heat calculation, calculation of various heat losses and thermal efficiency calculation of the boiler. According to the method, the thermal efficiency calculation of the boiler is performed by accurately calculating the boiler inlet coal quantity, main adverse factors influencing the boiler thermal efficiency are found out by analyzing boiler thermal efficiency calculation results, guidance is provided for modification and optimized running of the boiler, and the goal of energy saving and consumption reduction is achieved.

Description

Technical field [0001] The invention relates to the field of thermal energy engineering boilers, in particular to a thermal efficiency calculation method of a coal-fired and blast furnace gas mixed boiler. Background technique [0002] Iron and steel enterprises will produce a large amount of blast furnace gas during the smelting process. The blast furnace gas has the characteristics of low heating value, high nitrogen content, and poor combustion stability. However, many steel plants are not fully using blast furnace gas. Disperse, resulting in a waste of energy. How to make good use of the by-product blast furnace gas resources in iron and steel production is a common concern of relevant technicians. [0003] In the past year, pulverized coal boilers mixed with blast furnace gas have been successfully applied in some steel plants and gradually promoted. By introducing blast furnace gas into the pulverized coal boiler, the difficulty of burning blast furnace gas alone is solved,...

AI Technical Summary

Problems solved by technology

Among them, the gas flow measurement technology is relatively mature, but for the amount of coal fed into the furnace, especially for boilers equipped with a mid-storage pulverizing system, it is difficult to accurately obtain the amount of coal fed into the furnace under corresponding working conditions. Powder and blast furnace gas co-fired boilers are all equipped with intermediate storage pulverizing systems, which brings great difficulties to the calculation of boiler thermal efficiency

Images