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Device for acquiring temperature distribution of radiant tubes and radiant tube operation state adjusting method

A technology of temperature distribution and adjustment method, which is applied to thermometers, measuring devices, and electrical devices, etc. It can solve the problems of not being able to know the temperature distribution of the radiant tube in the furnace, unstable product quality required by production, and insufficient heating capacity.

Inactive Publication Date: 2020-10-23
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the flame in the tube is too long, the tail of the radiant tube will catch fire, the heat exchanger and the external equipment of the burner will burn out, and the thermal stress will increase and even cause the radiant tube to crack and leak; when the flame is short, the tail of the radiant tube will turn black and the strip will be heated Inhomogeneous, the heating capacity cannot meet the production requirements, and the product quality is unstable, etc.
[0007] (2) Since the radiant tube heat treatment furnace is in a sealed form, the key parameter of the temperature distribution of the radiant tube in the furnace cannot be known from the outside. Only when problems such as external burning, strip heating quality, and energy consumption increase, the radiation can be known. There is a problem with the tubes, but there is no cost-effective means to identify which radiant tubes have problems and make online adjustments
[0008] (3) Due to changes in external boundary conditions such as burner deterioration, gas calorific value fluctuations, dust accumulation in pipes, furnace aging, and steel strip specifications during actual operation, periodic adjustments are commonly used based on factory parameters or simply based on exhaust gas components. The application effect of the method is not ideal, and the temperature distribution state of the radiant tube cannot be adjusted

Method used

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  • Device for acquiring temperature distribution of radiant tubes and radiant tube operation state adjusting method
  • Device for acquiring temperature distribution of radiant tubes and radiant tube operation state adjusting method
  • Device for acquiring temperature distribution of radiant tubes and radiant tube operation state adjusting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] As attached figure 1 As shown, a device for obtaining the temperature distribution of a radiant tube includes a heat-resistant steel wire 21. The front end of the heat-resistant steel wire 21 has an anti-block head 23. Generally, the anti-block head can be welded to the front end of the heat-resistant steel wire. A plurality of armored thermocouples 22 are fixed on the hot steel wire through a fixing sleeve 26, a handle 24 is provided at the rear end of the heat-resistant steel wire, and the compensation wire 25 is connected to the armored thermocouple in sequence.

[0044] In this embodiment, the heat-resistant steel wire can be bent freely, the outer diameter of the heat-resistant steel wire 21 is 3-6mm, and the material can be heat-resistant stainless steel, such as Cr 25 Ni 20 .

[0045] In order to ensure the accuracy of temperature measurement, armored thermocouples can be installed on the heat-resistant steel wire at even intervals. The diameter of the armored thermoc...

Embodiment 2

[0047] As attached figure 2 As shown, a method for adjusting the operating state of a radiant tube specifically includes the following steps:

[0048] Step 1. Select a radiant tube 1 in the cold-rolling heat treatment furnace 3, and insert the radiant tube temperature distribution obtaining device 2 into the radiant tube 1 from the tail of the radiant tube 1. The flue gas analyzer 4 and the radiant tube 1 The exhaust pipe 5 is connected, the temperature recorder 6 is connected with the radiant pipe temperature distribution obtaining device 2, the air pressure gauge 7, the gas pressure gauge 10 and the air pipe 9 and the gas pipe 12 of the burner 13 installed in the radiant pipe 1 Meet.

[0049] Step 2: Collect the state parameters of the radiant tube 1 and the burner 13. State parameters include radiant tube temperature distribution t 1 (x), air pressure Pk, gas pressure Pm, O in exhaust gas composition 2 , CO content.

[0050] Step 3: Adjust the operating parameters of the radian...

Embodiment 3

[0054] As attached image 3 As shown, there are 20 sets of radiant tubes in a certain temperature control zone of the cold-rolled radiant tube heat treatment furnace, and there are a total of 200 sets of radiant tubes in the whole furnace. It is required to grasp the temperature distribution of all radiant tubes and adjust the temperature distribution to make all radiant tubes in the same condition.

[0055] Then, the method for adjusting the operating state of the radiant tube disclosed in Embodiment 2 is adopted, and one of the radiant tubes is selected to implement steps one to three. After the completion of step three, record t 1 (x), air pressure Pk 1 , Gas pressure Pm 1 ; Then select another radiant tube to repeat steps 1, step 2, and step 3, and record relevant data.

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Abstract

The invention discloses a device for acquiring the temperature distribution of radiant tubes. The device comprises a heat-resistant steel wire, wherein a blocking head is arranged at the front end ofthe heat-resistant steel wire, a plurality of armored thermocouples are fixed to the heat-resistant steel wire through fixing sleeves, a handle is arranged at the rear end of the heat-resistant steelwire, and compensation wires sequentially connected with the armored thermocouples are arranged at the rear end of the heat-resistant steel wire. The invention further provides a radiant tube operation state adjusting method. According to the method, the operating states of the radiant tubes are adjusted by adjusting the air pressure and the coal gas pressure on line according to the temperature distribution of the radiant tubes and tail gas component data, the operating states of the radiant tubes can be directly judged, and all the radiant tubes in a heat treatment furnace are adjusted to the same temperature distribution state according to an optimal temperature distribution curve. The device for acquiring the temperature distribution of the radiant tubes in the method can deform alongwith the internal structures of the radiant tubes; a portable radiant tube temperature distribution device is adopted, so a large number of thermocouples do not need to be welded to the radiant tubes;and operation is easy, use is convenient, and cost is low.

Description

Technical field [0001] The invention relates to a device for obtaining the temperature distribution of a radiant tube and a method for adjusting the operating state of the radiant tube, belonging to the technical field of metallurgical control. Background technique [0002] The radiant tube is the core equipment of the cold-rolling heat treatment furnace, which plays a role in heating and heat-treating cold-rolled strip steel in the furnace. The temperature distribution of the radiant tube not only directly affects the heat treatment quality of the strip steel, but also affects the safe and stable operation of the radiant tube and auxiliary equipment. The temperature distribution of the radiant tube is mainly affected by the burner installed on the radiant tube. Once the radiant tube burner deviates from the set combustion state, the length of the flame in the radiant tube will become longer or shorter, causing the temperature distribution of the radiant tube to change and unifor...

Claims

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Application Information

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IPC IPC(8): G01M99/00G01K7/04G01L15/00
CPCG01M99/002G01K7/04G01L15/00
Inventor 宋中华王昌亮李浩杜贤武丁翠娇马红韩斌闫乃忠杨超
Owner 武汉钢铁有限公司