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Optimizing method for pelletizing production integrating triune chain-and-grid conveyer, rotary kiln and circular cooler

An optimization method, a three-in-one technology, applied in the field of iron and steel metallurgy

Active Publication Date: 2015-04-08
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, this process is a relatively closed system, and many internal parameters cannot be directly measured. How to realize the online process simulation based on heat and mass transfer and physical and chemical reactions, so that the production process is intuitive and transparent, will be very helpful for operators to understand the working conditions. mastery of

Method used

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  • Optimizing method for pelletizing production integrating triune chain-and-grid conveyer, rotary kiln and circular cooler
  • Optimizing method for pelletizing production integrating triune chain-and-grid conveyer, rotary kiln and circular cooler
  • Optimizing method for pelletizing production integrating triune chain-and-grid conveyer, rotary kiln and circular cooler

Examples

Experimental program
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Effect test

Embodiment 1

[0048] The main equipment parameters of a grate-rotary kiln-circular cooler process in China are shown in Table 1. Table 2 shows the detected values ​​of the selected state parameters for a period of time. According to the calculation of the stability evaluation standard formula, the selected state parameters are all stable, that is, the working condition at 22:00 reaches a steady state. At this time, the internal production process can be revealed through the three-in-one mathematical model of heat and mass transfer, and the on-site detection values ​​of the input values ​​of the mathematical model at 22:00 are shown in Table 3.

[0049] Table 1 The main equipment parameters of a grate-rotary kiln-circular cooler process

[0050]

[0051] Table 2 The detection value and steady state judgment result of the state parameters for a period of time

[0052]

[0053] According to literature [1-5] and figure 2 The coupling algorithm shown, the calculation results of the math...

Embodiment 2

[0057] Table 4 shows the detection values ​​of the state parameters in another time period. According to the calculation of the stability evaluation standard formula, some state parameters are not in a stable state, and the production is in a fluctuating state at 09:44. At this time, the temperature of the preheating second-stage air box is 419°C (low), the discharge temperature of the kiln head is 1126°C (normal), the discharge temperature of the third-stage annular cooling is 148°C (high), and the temperature of the hood of the third-stage annular cooling is 291°C (very high), the temperature of the second stage hood of the ring cooling is 908°C (very high), the system automatically matches the expert control rules, according to image 3 and Figure 4 At this time, the rules R2 and R9 will be activated, and the system will prompt "Keep the coal volume unchanged, reduce the PH burner flow rate, reduce the PH return hot air volume", "Increase the water pumping volume of the be...

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Abstract

The invention discloses an optimizing method for pelletizing production integrating a chain-and-grid conveyer, a rotary kiln and a circular cooler which are triune. Based on material and heat exchange inside single equipment and among the three devices, heat supply and distribution of the chain-and-grid conveyer, the rotary kiln and the circular cooler are optimized online by adopting a technology of combining a mathematic model and expert control. The mathematic model is a triune heat and mass transfer model. A coupling relationship among a chain-and-grid conveyer model, a rotary kiln model and a circular cooler model is considered in construction. The heat and mass transfer model is applied to a pelletizing production process, so that the production process is transparent. Parameter control in the production process is carried out by adopting an expert control rule library, thereby optimizing the production process.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and relates to a pellet production optimization method in which a chain grate, a rotary kiln and an annular cooler are integrated. Background technique [0002] With the growth of iron and steel production and the increase in the proportion of pellets used in blast furnaces, the production of pellets in my country has continued to rise, reaching 131 million tons in 2013, accounting for 32.25% of the world's total. At present, the pellet production process is divided into shaft furnace, belt roaster, and grate-rotary kiln. The grate-rotary kiln process has strong adaptability to raw materials and fuels, good pellet quality, large single-machine production capacity, and low fuel consumption. , and can adapt to the characteristics of my country's coal-based energy structure. In 2013, its production capacity accounted for about 50% of my country's total pellet production. In the grate-rotary ...

Claims

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Application Information

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IPC IPC(8): C22B1/24
Inventor 陈许玲范晓慧杨桂明甘敏袁礼顺黄晓贤姜涛李光辉郭宇峰杨永斌李骞张元波朱忠平黄柱成许斌
Owner CENT SOUTH UNIV
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