A temperature control method for green pellet drying system of rotary hearth furnace

A temperature control method and drying system technology, applied in the field of metallurgy, can solve problems such as fluctuations in material volume, unstable temperature control, and affecting drying effects, so as to achieve the effects of reducing the amount of returned materials, improving production efficiency, and ensuring production stability.

Active Publication Date: 2020-08-11
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the disadvantages of unstable temperature control and affecting the drying effect of the rotary hearth furnace green pellet dryer in the prior art, and to provide a temperature control method for the green pellet drying system of the rotary hearth furnace. The room adopts temperature fuzzy control cascade control technology, which effectively solves the problems of green pellet quality, moisture balance, and material volume fluctuations during the green pellet drying process, ensures production stability, effectively improves green pellet quality, increases production efficiency, and simultaneously reduces environmental pollution

Method used

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  • A temperature control method for green pellet drying system of rotary hearth furnace

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Effect test

Embodiment 1

[0038] In the temperature control method of a rotary hearth furnace green pellet drying system in this embodiment, the coke oven gas pressure entering the flue gas furnace 4 is 3KPa; the coke oven gas flow rate is 1000Nm 3 / h; the air-fuel ratio in the flue gas furnace 4 is 1:0.7; the final air temperature of the flue gas furnace 4 is 300°C, and the flow rate of hot air entering the drying chamber 2 is 37000Nm 3 / h; The material surface thickness on the ball-losing net belt 1 in the drying chamber 2 is 150mm, and the speed of the ball-losing net belt 1 is 38Hz.

[0039] In this embodiment, the temperature of the 7-stage drying chamber 2 is designed intermittently by area. Specifically, along the transmission direction of the green balls, the temperatures of the 7-stage drying chamber 2 are 105°C, 125°C, 140°C, 160°C, 170°C, 180°C, 185°C, the green balls are effectively dried step by step, which not only ensures that the moisture content of the dried green balls can be reduced ...

Embodiment 2

[0053] A kind of temperature control method of the green pellet drying system of the rotary hearth furnace of the present embodiment is basically the same as the embodiment 1, the difference is that the pressure of the coke oven gas entering the flue gas furnace 4 in the present embodiment is 6KPa; the coke oven gas flow rate is 1300Nm 3 / h; the air-fuel ratio in the flue gas furnace 4 is 1:0.8; the final air temperature of the flue gas furnace 4 is 450°C, and the flow rate of hot air entering the drying chamber 2 is 37700Nm 3 / h; The material surface thickness on the ball-losing net belt 1 in the drying chamber 2 is 200mm, and the speed of the ball-losing net belt 1 is 48Hz.

[0054] Along the conveying direction of green balls, the temperatures of the seven-stage drying chamber 2 are 100°C, 120°C, 135°C, 155°C, 165°C, 175°C, and 180°C, respectively.

Embodiment 3

[0056] A kind of rotary hearth furnace green pellet drying system temperature control method of this embodiment is basically the same as embodiment 1, the difference is that the coke oven gas pressure entering the flue gas furnace 4 in the present embodiment is 5KPa; the coke oven gas flow rate is 1200Nm 3 / h; the final air temperature of the flue gas furnace 4 is 380°C, and the hot air flow rate entering the drying chamber 2 is 37500Nm 3 / h; The material surface thickness on the ball-losing net belt 1 in the drying chamber 2 is 180mm, and the speed of the ball-losing net belt 1 is 42Hz.

[0057] Along the conveying direction of green balls, the temperatures of the seven-stage drying chamber 2 are 110°C, 130°C, 145°C, 165°C, 175°C, 185°C, and 190°C, respectively.

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Abstract

The invention discloses a temperature control method for a green pellet drying system of a rotary hearth furnace, which belongs to the field of metallurgy. In the present invention, the temperature of each section of the drying chamber of the green pellet dryer is calculated and controlled in cascade according to the following formula: PTV-STV=ΔTV; SV-PV=ΔPV; PTV is the actual outlet temperature of each section of the drying chamber; STV is the temperature of each section of the drying chamber ΔTV is the temperature setting and feedback deviation of each drying chamber; SV is the damper opening setting of the induced draft fan on each drying chamber, PV is the actual damper opening of the induced draft fan on each drying chamber, ΔPV is the damper opening setting and feedback deviation of the induced draft fan in each drying chamber. The invention adopts the temperature fuzzy control cascade control technology for each section of the drying chamber, overcomes the shortcomings of the current rotary hearth furnace green pellet dryer that the temperature control is unstable and affects the drying effect, and effectively solves the green pellet quality and water balance in the green pellet drying process , The problem of fluctuations in the amount of material ensures the stability of production and effectively improves the quality of green balls.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a temperature control method for a green pellet drying system of a rotary hearth furnace. Background technique [0002] The rotary hearth furnace process is widely used in the industry at present. The direct reduction technology of the rotary hearth furnace is that the carbon-containing pellets after the raw materials are batched, mixed, pelletized and dried are added to the rotary hearth furnace with an annular furnace and a rotatable furnace bottom. , the pellets are reduced by carbon during the rotation of the furnace bottom at the furnace temperature. Among them, there are many types of materials in the raw material area, and the main raw materials include blast furnace gas mud, converter OG mud, front ash, bottom ash, sintering machine head ash, converter secondary ash, bentonite, and various dust removal ash imported from abroad, etc. , enter the batching bin for propor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B23/02F26B21/00F26B21/10
Inventor 芮文斌刘晓超周思远
Owner MAANSHAN IRON & STEEL CO LTD
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