Metallurgical gas calorific value soft measuring method based on heat exchange parameter of gas preheating system

Abstract

The invention relates to a metallurgical gas calorific value soft measuring method based on a heat exchange parameter of a gas preheating system. The soft measuring method is characterized in that based on real-time data of operating parameters of a combustion system, a gas calorific value is obtained through indirect solving through calculation, the idea roughly comprises the steps that an initial gas calorific value is firstly assumed, an actual dry flue gas quantity calculation value and an actual dry flue gas quantity check value are solved according to the assumed gas calorific value, theassumed gas calorific value is repeatedly corrected according to the ratio of the actual dry flue gas quantity calculation value to the actual dry flue gas quantity check value, and finally the accurate gas calorific value is obtained. The method can be used for guiding combustion optimization adjustment of pure-burning blast furnace gas or the pure-burning converter gas equipment, and a basis isprovided for safe and economic operation of combustion equipment, so that the problem that gas calorific value online analyzers are not arranged on the combustion equipment in most steel plants, andconsequently inconvenience and difficulties are brought to equipment operation is solved, and the good engineering practical value is achieved.

Description

technical field [0001] The invention relates to the technical field of energy saving of combustion equipment, in particular to a soft measurement method for the calorific value of metallurgical gas based on the heat transfer parameters of the gas preheating system. Background technique [0002] Iron and steel enterprises produce a large amount of by-product metallurgical gas in the production process, including blast furnace gas, converter gas and coke oven gas. Among them, blast furnace gas and converter gas have a large calorific value but low calorific value. Therefore, their efficient utilization has always been An important way for steel mills to reduce costs, increase efficiency, and improve market competitiveness. [0003] At present, steel mills mainly digest blast furnace gas and converter gas through equipment such as gas boilers, steel rolling heating furnaces, blast furnace hot blast stoves, and ladle bakers. For these combustion equipment, the calorific value o...

AI Technical Summary

Problems solved by technology

However, due to limited conditions, most iron and steel enterprises have not equipped combustion equipment with on-line gas calorific value measuring devices, and steel mills basically still use manual input of periodic laboratory analysis values ​​as the current gas calorific value.

In fact, due to the influence of factors such as the upstream smelting process, the composition and calorific value of the gas are difficult to keep stable and often fluctuate. To a certain extent, it interferes with the operation judgment of the operator and affects the optimal operation of the combustion equipment

[0004] Therefore, it is necessary to propose a soft measurement method for the calorific value of metallurgical gas based on the heat transfer parameters of the gas preheating system for the combustion equipment equipped with the gas preheating system. Provide a basis for economical and economical operation to solve the inconvenience and difficulty caused by the fact that most of the combustion equipment in iron and steel plants are not equipped with gas calorific value on-line analyzers

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