Method and device for heat supply of rotary hearth furnace

A technology of rotary hearth furnace and hot blast stove, which is applied in the direction of furnace, waste heat treatment, furnace components, etc. It can solve the problems of high energy consumption, excessive power consumption, and inability to operate, and achieve good results.

Active Publication Date: 2011-05-18
SICHUAN LOMON MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The characteristics of the existing rotary hearth furnace heating methods in foreign countries are that the waste heat of the flue gas is not fully utilized, and more energy is needed to cool and process the high-temperature flue gas, which consumes a lot of energy and is not economically cost-effective.
The second is that when the mineral powder is dried, another fuel is burned and more CO is generated. 2 It is not only economically uneconomical, but also harmful to the environment
The third is that foreign reducing agents are mostly gas-based, and a large number of regions in my country that do not have the objective conditions of high calorific value gas fuels cannot adopt this process method
Since many factories only have coal resources or natural gas is too expensive, the gas fuel for rotary hearth furnace burners can only use coal t

Method used

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  • Method and device for heat supply of rotary hearth furnace
  • Method and device for heat supply of rotary hearth furnace
  • Method and device for heat supply of rotary hearth furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Rotary hearth furnace 1 input briquette quantity is 8t / h, gas quantity (50℃) is 3200m 3 / h, combustion air volume (50 ℃) 6500m 3 / h, the corresponding flue gas volume is 54113.8m 3 / h, the flue gas temperature is 1300°C, the preheated combustion-supporting air temperature reaches 1035°C, the water content of the mineral powder is reduced from 11% to 0.725% after the mineral powder is dried, and the hot blast stove 3 furnace replacement cycle is 25min.

Embodiment 2

[0057] Rotary hearth furnace 1 input briquette quantity is 5t / h, gas quantity (50℃) 2000m 3 / h, combustion air volume (50 ℃) 4062.5m 3 / h, the corresponding flue gas volume is 33821.17m 3 / h, the flue gas temperature is 1300°C, the preheated combustion-supporting air temperature reaches 1025°C, the water content of the mineral powder is reduced from 10% to 0.93% after the mineral powder is dried, and the hot blast stove 3 furnace replacement cycle is 34min.

Embodiment 3

[0059] Rotary hearth furnace 1 input briquette quantity is 11.5t / h, gas quantity (50℃) 4000m 3 / h, combustion air volume (50 ℃) 9343.75m 3 / h, the corresponding flue gas volume is 77788.69m 3 / h The flue gas temperature is 1300°C, the temperature of the preheated combustion air reaches 1052°C, the water content of the mineral powder is reduced from 12% to 0.528% after the mineral powder is dried, and the hot blast stove 3 replacement cycle is 17min.

[0060] The present invention adopts double preheating and graded heat exchange technology of fuel and combustion-supporting air, adopts a waste heat utilization device combined with a spherical hot blast furnace, a fire tube rotary dryer, and a heat pipe heat exchanger, and introduces a part of the 1300°C high-temperature flue gas into the converter. Bottom furnace combustion-supporting air heat exchange system, preheats the combustion-supporting cold air to 1000℃~1050℃, preheats the gas to 200℃, and the burner 9 used uses 200℃ ...

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Abstract

The invention discloses a method and a device for the heat supply a rotary hearth furnace. Smoke afterheat generated by the rotary hearth furnace is firstly heated up through a rear combustion chamber to 1300 DEG C and then respectively introduced into a ball-type hot blast furnace and a fire tube-type rotary dryer which are interconnected in parallel, double preheating and staged heat exchange of the fuel for gas generator and the combustion-supporting air are realized by means of the coordinative operation of combined afterheat utilization devices which are mutually connected, such as ball-type hot blast furnace, heat pipe exchanger, fire tube-type rotary dryer and the like, thus the temperature of combustion flame at a combustion nozzle of the rotary hearth furnace is guaranteed to be not less than 2200 DEG C and drying iron ore powder is performed while high temperature reduction is implemented. The novel high-temperature smoke afterheat recycling technology of the rotary hearth furnace is especially suitable for plants in the area without natural gas and coke-oven gas which require coal-based direct reduction rotary hearth furnace to generate high reduction temperature ranging from 1300 to 1400 DEG C, the technology is advanced, the economical benefit is considerable, the top-quality fuel is saved, the expenditure for cooling high temperature smoke is avoided, and the CO2emission and the production cost are lowered.

Description

technical field [0001] The invention relates to a rotary hearth furnace heat supply method and device, which can be used in a rotary hearth furnace for direct reduction in the iron and steel metallurgy industry, including the use of vanadium-titanium magnetite or common iron ore or other metal elements such as vanadium, chromium, nickel , molybdenum, cobalt and other iron ore, non-ferrous metals, ilmenite, factory iron-containing dust, etc. as raw materials for the rotary hearth furnace in the direct reduction project. Background technique [0002] The rotary hearth furnace direct reduction iron process is a new ironmaking process that has emerged and developed rapidly in the past 30 years. The rotary hearth furnace process used in the American inmetco and IDI factories uses briquettes mixed with iron dust from iron and steel plants and coal for direct reduction. , the gas fuel is natural gas, and its calorific value is 9000 kcal / m 3 , the combustion air is preheated to 280...

Claims

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Application Information

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IPC IPC(8): F27B9/36F27D17/00
CPCY02P10/143Y02P10/25
Inventor 秦廷许范先国何丰李华彬黄建平胡晓陈厚生
Owner SICHUAN LOMON MINING & METALLURGY
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