Heat efficiency calculating method for pulverized coal boiler with blending combustion of blast furnace gas

Abstract

The invention discloses a heat efficiency calculating method for a pulverized coal boiler with blending combustion of blast furnace gas, and aims to provide a heat efficiency calculating method for a pulverized coal boiler with blending combustion of the blast furnace gas and nonnegligible fuel nitrogen content. According to the heat efficiency calculating method, all input parameters are obtained, joint solution is conducted on actual coal as fired and characteristic data of blended fuel, combustion calculation of the blended fuel is conducted, heat loss of all items is calculated, and heat efficiency of the boiler is obtained. The heat efficiency calculating method for the pulverized coal boiler under the circumstance of the blending combustion of the coal and the blast furnace gas is suitable for the characteristic that the blast furnace gas is high in nitrogen content, and avoids calculation errors caused by neglection of the fuel nitrogen content in the traditional computing methods, and therefore the calculated boiler heat efficiency is higher in accuracy.

Description

technical field [0001] The invention relates to a method for measuring and calculating the thermal efficiency of a pulverized coal boiler mixed with blast furnace gas. Background technique [0002] Iron and steel enterprises produce a large amount of blast furnace gas in the process of smelting. Due to the characteristics of low calorific value, high nitrogen content and poor combustion stability of blast furnace gas, many iron and steel factories currently do not fully utilize blast furnace gas. A large amount of blast furnace gas is It is released, resulting in a waste of energy, so how to make full use of the by-product blast furnace gas resources in the iron and steel production process has become a common concern of relevant technical personnel. [0003] In recent years, pulverized-coal boilers mixed with blast furnace gas have been successfully applied and gradually promoted in some iron and steel plants. Diffusion rate. And from the point of view of the iron and ste...

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Problems solved by technology

For blast furnace gas flow, its measurement technology is relatively mature at present, but for the amount of coal burned into the furnace, especially for boilers equipped with intermediate storage pulverizing systems, it is difficult to accurately obtain the amount of coal burned into the furnace under corresponding working conditions, and At present, most pulverized coal boilers mixed with blast furnace gas are equipped with intermediate storage pulverizing systems, which brings great difficulties to the calculation of boiler thermal efficiency.

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