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A method for self-optimization of air-fuel ratio of blast furnace hot blast stove

A hot blast stove, air-fuel ratio technology, applied in the direction of combustion method, blast furnace, blast furnace details, etc., can solve the problems of unreasonable air-fuel ratio, low operating efficiency of hot blast stove, etc., achieve full energy utilization, improve combustion control level and combustion efficiency, The effect of strong heat storage capacity

Active Publication Date: 2019-01-22
北京和隆优化科技股份有限公司
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Problems solved by technology

[0005] In order to solve the problem of low operating efficiency of the hot blast stove caused by the unreasonable air-fuel ratio of the existing blast furnace hot blast stove control system, the present invention proposes a self-optimizing method for the air-fuel ratio of the blast furnace hot blast stove, which can be used without imposing on the operation of the hot blast stove Disturbance, without the need to configure high-precision instruments, calorific value analyzers, and oxygen content instruments, the online operation of the air-fuel ratio of the hot blast stove can be self-optimized, which can effectively improve the combustion efficiency of the blast furnace hot blast stove, the vault temperature and the air supply temperature, and realize hot blast. Full utilization of furnace energy

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0019] Combustion efficiency evaluation module of hot blast stove

[0020] At the time of firing T1, keep the air-fuel ratio constant, take T as the cycle, and continue for n cycles. The influence of the gas flow increment m1 on the vault temperature within n*T time is recorded as f(m1, T1), and the vault The average temperature is recorded as GT1. After the gas flow rate is changed, N sets of data f(m2, T2), f(m3, T3), ..., f(mN, TN) and GT2, GT3, ..., GTN are obtained, using multiple linear Regression analysis to obtain the influence of gas flow change on vault temperature F(N)= f(m1,T1)+ f(m2,T2)+...+f(mN,TN), the hot blast stove combustion efficiency evaluation module outputs hot air Furnace combustion efficiency evaluation value XLPJ=GTN-GT1-F(N), where T ranges from 6 to 10 seconds, n ranges from 10 to 30, and N ranges from 5 to 10.

[0021] S...

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Abstract

The invention relates to the technical field of optimization control of blast-furnace hot blast stoves and discloses a self-optimization method for an air-fuel ratio of a blast-furnace hot blast stove. The self-optimization method is characterized in that a hot blast stove combustion efficiency evaluation module, a single-furnace air-fuel ratio trend self-optimization module and a multi-furnace air-fuel ratio coordinated optimization module are arranged; the method can realize online operation of the self-optimization of the air-fuel ratio of the hot blast stove under the conditions that disturbance is not applied to the operation of the hot blast stove and a high-precision instrument, a calorific value analyzer and an oxygen content instrument do not need to be arranged; the problem that the operation efficiency of the hot blast stove is relatively low, caused by the fact that the air-fuel ratio of an existing blast-furnace hot blast stove control system is not reasonable, is effectively solved; the combustion efficiency, dome temperature and air blowing temperature of the blast-furnace hot blast stove are improved and sufficient utilization of hot blast stove energy sources is realized.

Description

technical field [0001] The invention relates to the technical field of optimal control of blast furnace hot blast stoves, in particular to a method for self-optimizing the air-fuel ratio of blast furnace hot blast stoves. Background technique [0002] At present, the air-fuel ratio control methods of domestic hot blast stoves are mainly ratio adjustment method and exhaust gas oxygen content cascade adjustment method. Ratio adjustment method refers to the combustion of air and gas according to a fixed ratio. This fixed ratio is generally obtained from experimental data or theoretical calculation data under certain working conditions. Obviously, this control method cannot adapt to various frequently-changing conditions. Such working conditions, especially when the calorific value of gas changes, will make the combustion situation worse, making the combustion efficiency of the hot blast stove lower, and the temperature of the air supply cannot be guaranteed. The cascade adjust...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B9/00F23N1/02
CPCC21B9/00F23N1/02F23N2223/44
Inventor 李明党
Owner 北京和隆优化科技股份有限公司
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