Low oxygen content and low nitrogen consumption control system and method for radiant tube-heated non-oxidation roller hearth furnace

A technology of radiant tube heating and low oxygen content, which is applied in the field of metallurgy, can solve the problems of affecting the economic benefits of enterprises, nodules on the furnace bottom roll surface, and spending a lot of time

Inactive Publication Date: 2011-11-09
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the prolongation of the service life of the equipment, the backward nitrogen filling method of the non-oxidized roller hearth furnace heated by radiant tubes, etc., especially the quenching machine equipment behind the current furnace, the oxygen content in the furnace is abnormally high during the production process, and the furnace bottom rollers Severe nodules on the surface often form defects such as roll marks, scratches and pits on the lower surface of the steel plate. If it is light, it will take a lot of time and manpower to carry out surface grinding, and if it is serious, it will cause the steel plate to be changed to an agreement plate, which will affect the company's reputation. Economic benefits are one of the problems that need to be solved urgently in the heat treatment production line of steel mills

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  • Low oxygen content and low nitrogen consumption control system and method for radiant tube-heated non-oxidation roller hearth furnace
  • Low oxygen content and low nitrogen consumption control system and method for radiant tube-heated non-oxidation roller hearth furnace

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Experimental program
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Effect test

Embodiment 1

[0024] The low oxygen content and low nitrogen consumption control system of the radiant tube heating non-oxidizing roller hearth furnace in this embodiment has a structure such as figure 1 As shown, 20 nitrogen-charging electromagnetic control valves 2 are set on the furnace body 1. The nitrogen-filling electromagnetic control valves 2 are connected to the nitrogen main pipe 4 through the nitrogen gas branch pipe 3. The 20 nitrogen-charging electromagnetic control valves are arranged in two rows up and down. There are 10 in each row; the furnace body is divided into 6 zones, which are the front zone 5 of the upper furnace corresponding to the 3 nitrogen-filled electromagnetic control valves at the front end of the upper furnace, and the 4 nitrogen-filled electromagnetic control valves at the middle end of the upper furnace. Corresponding middle zone 6 of the upper furnace, rear zone 7 of the upper furnace corresponding to the three nitrogen-filled electromagnetic control valve...

Embodiment 2

[0038] The low oxygen content and low nitrogen consumption control system structure of the radiant tube heating non-oxidation roller hearth furnace of this embodiment is the same as that of embodiment 1, and the low oxygen content and low nitrogen consumption control method of the radiant tube heating non-oxidation roller hearth furnace is as follows Steps to proceed:

[0039] (1) The speed of the steel plate entering the furnace is set at 20m / min. On the one hand, the slow speed will lead to a long opening time of the furnace door and a large amount of air entering. The deviation between the signal and the actual position is aggravated, and the inconsistency between the heating model and the actual situation affects the quality of the steel plate after heat treatment;

[0040] (2) Set the nitrogen filling electromagnetic control valves corresponding to the front area of ​​the upper furnace, the rear area of ​​the upper furnace, the front area of ​​the lower furnace and the re...

Embodiment 3

[0051] The low oxygen content and low nitrogen consumption control system structure of the radiant tube heating non-oxidation roller hearth furnace of this embodiment is the same as that of embodiment 1, and the low oxygen content and low nitrogen consumption control method of the radiant tube heating non-oxidation roller hearth furnace is as follows Steps to proceed:

[0052] (1) The speed of the steel plate entering the furnace is set at 30m / min. On the one hand, the slow speed will lead to a long opening time of the furnace door and a large amount of air entering. The deviation between the signal and the actual position is aggravated, and the inconsistency between the heating model and the actual situation affects the quality of the steel plate after heat treatment;

[0053] (2) Set the nitrogen filling electromagnetic control valves corresponding to the front area of ​​the upper furnace, the rear area of ​​the upper furnace, the front area of ​​the lower furnace and the re...

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Abstract

The invention provides a low oxygen content and low nitrogen consumption control method for a radiant tube-heated non-oxidation roller hearth furnace, relating to an oxygen content and nitrogen consumption control method inside a furnace in metallurgy field. The method comprises the following steps: carrying out zone control on the radiant tube-heated non-oxidation roller hearth furnace, linking hearth pressure, oxygen content and nitrogen charging electromagnetism valves, and conducting dynamic control of oxygen dilution and hearth pressure regulation based on the real-time measured values of the hearth pressure and oxygen content of each zone so as to secure certain positive pressure in the hearth when the furnace door is started; simultaneously, reasonably selecting the number and positions of the nitrogen charging electromagnetism valves which are opened frequently based on the technology for heating processing, so as to enable the radiant tube-heated non-oxidation roller hearth furnace to realize normalizing or tempering production, especially ultra-low oxygen content and low nitrogen consumption control in hardening production process. By using the lowest nitrogen consumption, the invention obviously reduces oxygen content in the radiant tube-heated non-oxidation roller hearth furnace in hardening / normalizing and tempering production processes.

Description

technical field [0001] The invention relates to a method for controlling oxygen content and nitrogen consumption in a furnace in the field of metallurgy, in particular to a method for controlling low oxygen content and low nitrogen consumption of a radiant tube heating non-oxidation roller hearth furnace. Background technique [0002] Since the radiant tube heating non-oxidizing roller hearth furnace has good heating uniformity and non-oxidizing atmosphere, the surface quality of the steel plate after heat treatment is better, and it is one of the key heat treatment equipment for producing high-tech and high value-added medium and heavy plate products. However, due to the prolongation of the service life of the equipment, the backward nitrogen filling method of the non-oxidized roller hearth furnace heated by radiant tubes, etc., especially the quenching machine equipment behind the current furnace, the oxygen content in the furnace is abnormally high during the production pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/76C21D9/46F27D7/06
Inventor 杨兆根盘国力杨恒娄之宁吴俊平姜辉
Owner NANJING IRON & STEEL CO LTD
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