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Hot-blast stove combustion control method

A control method and hot blast stove technology, which is applied in the field of blast furnace smelting, can solve problems such as large amount of calculation and difficulty in realization

Inactive Publication Date: 2015-05-27
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the embodiments of the present invention is to provide a combustion control method for a hot blast stove to solve the problem that the combustion control method of the mathematical model in the prior art has a large amount of calculation and is difficult to implement

Method used

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  • Hot-blast stove combustion control method

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Comparison scheme
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Embodiment 1

[0019] like figure 1 Shown is a flow chart of a hot blast stove combustion control method provided by an embodiment of the present invention, which consists of figure 1 It can be seen that in the embodiment of a hot blast stove combustion control method provided by the present invention, the hot blast stove combustion control includes the initial combustion period, the vault temperature management period and the exhaust gas temperature management period. The method includes:

[0020] In step 102, the instantaneous gas volume V to be input at the initial stage of combustion is determined according to the type of hot blast stove gS .

[0021] Among them, the instantaneous gas volume V input at the initial stage of combustion gS , which is usually determined when the hot blast stove is selected, and the maximum amount of gas that can be introduced by the gas channel will be taken.

[0022] In step 104, the temperature manager obtains the actual temperature T from the vault tem...

Embodiment 2

[0058] This embodiment is the application of Embodiment 1 in the specific hot blast stove firing environment, such as figure 2 Shown, specifically include the following steps:

[0059] In step 201, start firing the furnace.

[0060] The furnace specifically includes the initial stage of combustion, the vault temperature management period and the waste gas temperature management period, as described in the first embodiment.

[0061] In step 202, burn the furnace with the maximum amount of gas and combustion air.

[0062] After entering the initial stage of combustion, according to the type of the hot blast stove, the maximum gas volume V that satisfies the process setting is adopted gSmax and the maximum combustion air volume V oSmax , to carry out the furnace process. where V gS and V oS Satisfy the air-fuel ratio k.

[0063] In step 203, it is judged whether the temperature of the dome reaches the preset threshold value 1, which is the reference temperature for judgin...

Embodiment 3

[0075] This embodiment is a specific derivation process given by formula (2), and will start from the algorithm principle supporting the present invention, and illustrate the feasibility and effectiveness of the method of the present invention.

[0076] According to the principle of heat exchange, the energy Q A When it is in the air supply state (the hot blast stove system includes: the combustion state, the stuffy furnace state and the air supply state), the physical heat difference between the cold air blown in by the blower and the hot air blown out after being heated by the hot blast stove, each of the present invention The coal gas and supporting gas mentioned in the embodiments are for heating the hot blast stove, so that the cold wind blown by the blower can complete the heating when passing through the hot blast stove. The physical heat difference is specifically expressed as:

[0077] Q A = ∫ ...

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Abstract

The invention is applicable to the field of blast furnace smelting, and provides a hot-blast stove combustion control method. The hot-blast stove combustion control includes a preliminary combustion period, a dome temperature management period and a waste gas temperature management period; the method comprises the following steps: depending on the type of a hot-blast stove, determining an instantaneous gas amount VgS to be inputted in the preliminary combustion period; acquiring actual temperature TcT from a dome temperature sensor by virtue of a temperature manager, and calculating an instantaneous gas amount VgT in the dome temperature management period according to the actual temperature TcT and target temperature TdT; on the basis of target temperature T and initial temperature T0 of blasting as well as an instantaneous blast volume V, calculating required energy QA, and respectively calculating accumulated energy QS in the preliminary combustion period and accumulated energy QT in the dome temperature management period according to the VgS and the VgT, and obtaining accumulated energy QF required by the waste gas temperature management period through a formula QA-QS-QT; and calculating an instantaneous gas amount VgF in the waste gas temperature management period according to real-time TcF and QF of waste gas. Through the method, the instantaneous gas amount in the waste gas temperature management period is calculated, so as to control the combustion of the entire hot-blast stove.

Description

technical field [0001] The invention belongs to the field of blast furnace smelting, and in particular relates to a combustion control method of a hot blast stove. Background technique [0002] The hot blast stove is an important part of blast furnace ironmaking. Its function is to provide hot blast with stable temperature and pressure to the blast furnace. The hot blast stove system has three states: combustion, simmering and air supply. Among them, the combustion state accumulates heat through the combustion of gas and combustion-supporting air; the air supply state releases heat, and heats the cold air sent from the blower station into hot air that meets the production requirements of the blast furnace; transition between. It can be seen that combustion is the basis of air supply. Using appropriate combustion control methods can not only increase the air temperature and reduce energy consumption, but also further reduce the cost of pig iron and reduce environmental poll...

Claims

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Application Information

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IPC IPC(8): C21B9/00C21B5/00F23N1/00
Inventor 李凌强健
Owner WISDRI ENG & RES INC LTD
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