On-line monitoring method of gas heating value and boiler thermal efficiency of blast furnace gas boiler

Abstract

A method for on-line monitoring of the calorific value of incoming gas and boiler thermal efficiency of a blast furnace gas boiler, comprising the following steps: collecting online operating data of the unit in real time, including the oxygen content of the flue gas, the CO content in the flue gas, the exhaust gas temperature, and the blast furnace gas entering the furnace. Flow rate, boiler evaporation, ambient temperature, and input data for solving the boiler’s effective use of heat; preprocess the obtained raw data to obtain effective data; obtain the furnace gas calorific value and boiler thermal efficiency of the blast furnace gas boiler based on the obtained effective data . The invention can identify the low-level calorific value of blast furnace gas online, and is used for online monitoring of boiler thermal efficiency, which can provide reliable basis for boiler performance analysis and combustion adjustment, and has important practical significance; blast furnace gas calorific value and boiler thermal efficiency are completely passed through the boiler The operating parameters are calculated online, without offline data collection and any manual input parameters, and can be realized entirely by the online data collection of the unit, which has good implementability.

Description

technical field [0001] The invention belongs to the field of boilers of thermal energy engineering, and particularly relates to an on-line monitoring method for the calorific value of gas fed into a blast furnace gas boiler and the thermal efficiency of the boiler. Background technique [0002] Iron and steel enterprises produce a large amount of blast furnace gas in the ironmaking process. As a by-product resource in the smelting process, the effective recovery and utilization of blast furnace gas is one of the key points of energy saving and consumption reduction in iron and steel enterprises. In recent years, with the development and progress of low calorific value gas combustion technology, blast furnace gas boilers have been widely used in self-provided power plants of iron and steel plants, and have gradually become the main way for iron and steel enterprises to utilize blast furnace gas. [0003] Iron and steel enterprises produce a large amount of blast furnace gas i...

AI Technical Summary

Problems solved by technology

However, due to limited conditions, at present most of the self-provided power plant gas boilers of iron and steel enterprises are not equipped with online measuring devices for the calorific value of blast furnace gas, and the power plants basically still use manual input of regular laboratory analysis values ​​as the current boiler fuel calorific value. Many self-provided power plants of small and medium-sized iron and steel plants do not even have the conditions for regular sampling and analysis of gas.

In fact, affected by factors such as the upstream smelting process, the composition and calorific value of blast furnace gas are difficult to keep stable and often fluctuate. The manually entered periodic test values ​​are likely to deviate greatly from the current real value, and the artificially set value is taken Or the way of taking the last thermal test value is even more so

Obviously, the uncertainty of the calorific value of blast furnace gas will directly affect the solution of the thermal efficiency of the boiler, and then affect the performance analysis and optimal operation of the boiler

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