Blast furnace gas boiler furnace-entering gas thermal value and boiler heat efficiency on-line monitoring method

Abstract

The invention relates to a blast furnace gas boiler furnace-entering gas thermal value and boiler heat efficiency on-line monitoring method, which comprises the following steps of collecting online operation data of a machine set in real time, wherein the online operation data includes smoke gas oxygen content, smoke gas CO content, exhausted smoke temperature, furnace-entering blast furnace gas flow rate, boiler evaporation quantity, environment temperature; solving the input data of effective utilization heat of a boiler; preprocessing the obtained original data to obtain effective data; obtaining the furnace-entering gas thermal value and the boiler heat efficiency of a blast furnace gas boiler according to the obtained effective data. The lower calorific value of blast furnace gas canbe recognized on line and is used for online monitoring of the boiler thermal efficiency; reliable basis can be provided for boiler performance analysis and combustion regulation; important practicalsignificance is realized; the blast furnace gas thermal value and the boiler thermal efficiency are obtained completely through online calculation on boiler operation parameters; off-line data collection and any manual parameter input are not needed; the operation can be realized completely through the online data collection of the machine set; good implementation performance is realized.

Description

technical field [0001] The invention belongs to the boiler field of thermal energy engineering, and in particular 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 recycling of blast furnace gas is one of the key points of energy saving and consumption reduction for 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-owned power plants of iron and steel plants, and have gradually become the main way for iron and steel enterprises to use blast furnace gas. [0003] Iron and steel enterprises produce a large amount of blast furnace gas in the ironmaking process...

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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