Air-fuel ratio detection device

Abstract

The invention belongs to the technical field of meter detection, and discloses an air-fuel ratio detection device. The air-fuel ratio detection device comprises a combustion furnace, a resistance wire, an oxygen measurer and a data processing control center, wherein the combustion furnace comprises a combustion furnace shell and a furnace pipe accommodated in the combustion furnace shell; the resistance wire is wound on the furnace pipe; the data processing control center is used for controlling the resistance wire to be in a working state or an idling state, so that the temperature in the combustion furnace can be kept at working temperature; the oxygen measurer is connected to the combustion furnace and is used for detecting the residual oxygen content of exhaust gas in real time and transmitting detected residual oxygen content data to the data processing control center; and the data processing control center processes the residual oxygen content data to obtain a complete combustion air-fuel ratio with a fuel gas heat value in a changing state, so that the air-fuel ratio of each furnace section of an industrial kiln is corrected according to an excessive air coefficient required by the furnace section, and the combustion efficiency of the industrial kiln is improved.

Description

technical field [0001] The invention belongs to the technical field related to instrument detection, and more specifically relates to an air-fuel ratio detection device. Background technique [0002] At present, the types of combustion furnace gas used by domestic large-scale comprehensive steel rolling mills are mainly blast furnace gas and mixed gas (high-coke mixed gas, high-coke mixed gas). In the actual production process, due to changes in the amount of gas generated and used (the blast furnace body wind or when it is waiting for materials, the gas consumption increases; when the specifications, varieties, and output of the combustion furnace described in each production line change, the amount of gas used will be caused. and main pipe pressure fluctuations), high-coke or high-coke-to-high-coke-to-mixed gas use ratio is not stable, and gas buffer capacity is insufficient and other factors will affect the large fluctuations in the gas calorific value, seriously affect t...

AI Technical Summary

Problems solved by technology

The combustion type calorific value meter has a high degree of automation, and can perform continuous and online automatic detection of the calorific value and provide control signals when the calorific value of the gas changes. Questions: 1. Combustion conditions have a great influence on the test results, such as intake pressure, gas source changes, etc., which need to be corrected and adjusted accordingly

On-site preprocessing unit redundancy is complicated, and the maintenance workload of the preprocessing system is relatively large when a failure occurs

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