Temperature control method for green ball drying system of rotary hearth furnace

A temperature control method and drying system technology, applied in the field of metallurgy, can solve the problems affecting drying effect, fluctuation of material volume, unstable temperature control, etc., and achieve the effect of improving production operation rate, reducing the amount of returned materials, and reducing large-scale fluctuations.

Active Publication Date: 2018-01-12
MAANSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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  • Temperature control method for green ball 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 ball drying system of a rotary hearth furnace, and belongs to the field of metallurgy. According to the method, the temperature of eachdrying chamber of a green ball drying machine is subjected to cascade calculation control according to the following formula: PTV-STV=delta TV, and SV-PV=delta PV, wherein the PTV is the actual outlet temperature of each drying chamber, the STV is the set outlet temperature of each drying chamber, the delta TV is the deviation between the set temperature and the feedback temperature of each drying chamber, the SV is the set opening degree of an air door of an induced draft fan on each drying chamber, the PV is the actual opening degree of the air door of the induced draft fan on each drying chamber, and the delta PV is the deviation between the set opening degree and the feedback opening degree of the air door of the induced draft fan on each drying chamber. According to the method, a temperature fuzzy control cascade control technology is adopted for each drying chamber, and therefore the defects that at present, the control over the temperature of the green ball drying machine of the rotary hearth furnace is unstable, and the drying effect is influenced can be overcome, the problems the green ball quality, the water balance and the material quantity fluctuation in the green balldrying process can be effectively solved, the production stability can be guaranteed, and in addition, the green ball quality can be effectively improved.

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 Applications(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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