Method for controlling temperature of reduction rotary kiln by optimization and adjustment of fuel amount

A rotary kiln, fuel volume technology, applied in the field of rotary kiln, can solve the problems of fuel system and temperature inconsistency, high energy consumption, low reduction efficiency, etc.

Active Publication Date: 2020-12-08
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In view of the existing technology, the temperature in the rotary kiln along the kiln length is uneven, easy to form rings, and the reduction efficiency is low; the high temperature section is short, volatile matter and CO escape into the reburning chamber, and the temperature is difficult to control, the output is small, and the energy consumption is low. High; the temperature cannot be accurately monitored in real time online, causing technical problems such as incoordination between the air supply system, the fuel system, and the temperature, and easy ring formation; the present invention proposes a method for controlling the temperature of the rotary kiln by optimizing and adjusting the amount of fuel. An ultrasonic temperature measuring and ranging analyzer is added to the kiln hood of the rotary kiln, and reducing fuel is added from the kiln head and kiln tail of the reducing rotary kiln at the same time

Method used

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  • Method for controlling temperature of reduction rotary kiln by optimization and adjustment of fuel amount
  • Method for controlling temperature of reduction rotary kiln by optimization and adjustment of fuel amount
  • Method for controlling temperature of reduction rotary kiln by optimization and adjustment of fuel amount

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0123] like figure 1 As shown, a method for controlling the temperature of the reduction rotary kiln by optimizing and adjusting the amount of fuel is provided. The reduction rotary kiln 1 is equipped with an ultrasonic temperature measurement and ranging analyzer 2, and the kiln body of the reduction rotary kiln 1 is divided into n sections. There are secondary air nozzles 3, and each secondary air nozzle 3 is connected with a blower fan 4. The method includes the following steps:

[0124] 1) Put the material to be reduced into the reducing rotary kiln 1, add reducing fuel at the kiln head 101 and kiln tail 102 of the reducing rotary kiln 1, and inject secondary air from the secondary air nozzle 3 on each kiln body.

[0125] 2) A burner 103 is provided at the position of the kiln head 101 of the reduction rotary kiln 1, and the materials to be reduced are burned and reduced by reducing fuel in the reduction rotary kiln 1 to obtain the reduced materials.

[0126] 3) Ultrason...

Embodiment 2

[0129] like figure 2 As shown, Example 1 is repeated, except that the ultrasonic temperature measurement and distance measuring analyzer 2 detects the temperature of each section of the kiln body of the reduction rotary kiln 1, and compares the atmospheric temperature Ti obtained by the detection of the section of the kiln body with the target reduction temperature T 0 , if the atmospheric temperature Ti of the kiln body is at (1±10%)T 0 Within the range, return to step 3) The control system does not make fuel optimization adjustments. If the atmospheric temperature Ti of the kiln body exceeds (1±10%)T 0 within the range, proceed as follows:

[0130] 5a) If the section of the kiln body is located in the 1 / 3 or 1 / 2 section of the front section of the kiln body of the entire reduction rotary kiln 1, by adjusting the amount of reducing fuel added from the kiln head 101, the atmosphere temperature at the position of the section of the kiln body Ti at (1±10%) T 0 In the range....

Embodiment 3

[0133] Repeat Example 2, adding a measure to adjust the wind pressure of the kiln head 101 of the reducing rotary kiln 1 into the wind. Step 5a) is specifically:

[0134] 5a1) If the section of the kiln body is located in the 1 / 3 or 1 / 2 section of the front section of the kiln body of the entire reduction rotary kiln 1, adjust the wind pressure of the wind injected into the position of the kiln head 101, and the ultrasonic temperature measurement and distance measurement analyzer 2 detects the kiln body. Atmospheric temperature Ti at the kiln body position:

[0135] After adjusting the wind pressure of the wind injected into the position of the kiln head 101, the atmosphere temperature Ti at the position of the kiln body is (1±10%)T 0 Within the range of the current kiln head 101, the wind pressure of the wind injected into the position is kept constant, and the temperature adjustment is completed.

[0136] If the air pressure of the air injected into the position of the kil...

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Abstract

The invention discloses a method for controlling the temperature of a reduction rotary kiln by optimization and adjustment of the fuel amount. The method includes the following steps of: additionallyinstalling an ultrasonic temperature and distance measurement analyzer on a kiln head cover of the rotary kiln; simultaneously adding a reductive fuel through the kiln head and the kiln tail of the reduction rotary kiln; monitoring the temperature along a kiln length direction line on line in real time; adjusting the amount of added reductive fuel at the kiln head and / or the kiln tail of the reduction rotary kiln according to the difference between the temperature of a measured point and the target temperature to ensure that the uniformity of a temperature field in the kiln and in the kiln length direction is guaranteed, the local temperature is prevented from being too high or too low, and ring formation in the rotary kiln is avoided; a longer high-temperature zone is provided for reduction materials; and the product quality index is remarkably improved.

Description

technical field [0001] The invention relates to a method for controlling the temperature of a rotary kiln, in particular to a method for controlling the temperature of a reduction rotary kiln by optimizing and adjusting the amount of fuel, and belongs to the technical field of the rotary kiln. Background technique [0002] The environmental protection department has long 2 and NOx emission charges, as the pressure on carbon emission reduction intensifies, China's carbon emission trading system is about to operate, CO 2 Emissions will also be gradually included in the scope of payment. The traditional long process will bring a higher cost burden to steel enterprises than the short process; the world's steel development trend is gradually transitioning from the long process of "blast furnace-converter" to the short process of "direct reduction (scrap steel) - electric furnace". It will be increased from 66.8% to 70%, and many blast furnaces will be closed or temporarily idle...

Claims

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Application Information

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IPC IPC(8): C21B13/08
CPCC21B13/08Y02P10/20
Inventor 胡兵曾小信
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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