Gas heat value soft measurement method based on air and gas double-preheating

Abstract

The invention provides a gas heat value soft measurement method based on air and gas double-preheating. The soft measurement method comprises the steps of obtaining real-time data of a combustion system operation parameter; performing preprocessing on the acquired data, and obtaining effective data for solving the gas heat value; and according to the acquired effective data, calculating a gas drybase heat value. According to the method of the invention, the gas dry base heat value is indirectly calculated through a relation between a dry air amount and the gas heat value. The method is suitable for combustion equipment in which pure burning of blast furnace gas or converter gas and air and gas double-preheating technology are utilized. A calculating result can be used for guiding combustion optimization adjustment of the combustion equipment, thereby supplying a basis for safe and economic operation of the combustion equipment. The gas heat value soft measurement method can settle inconvenience and a difficulty in combustion equipment operation caused by no gas heat value online analyzer in a majority of steel plant gas combustion systems, and furthermore has high engineering value.

Description

technical field [0001] The invention relates to the technical field of energy saving of combustion equipment, in particular to a gas calorific value soft measurement method based on double preheating of air and gas. 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 of fuel is an important basis for its combustion ad...

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 gas calorific value soft measurement method based on operating parameters for the combustion equipment with dual preheating of air and gas. The calorific value of gas can be identified through the operating parameters of the combustion equipment, and the results can be used to guide the combustion optimization adjustment of the combustion equipment. , to provide a basis for the safe and economical operation of combustion equipment, and to solve the inconvenience and difficulty caused by the operation of most steel plant combustion equipment that is not equipped with gas calorific value online analyzers

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