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Negative pressure control method and negative pressure control system for main exhaust fan of sintering machine

A technology of negative pressure control and exhaust fan, which is applied in the field of sintering technology, can solve the problems of material layer thickness change, high power consumption and loss, and affect the thickness of trolley material layer, so as to save electric energy, save electric energy and reduce energy consumption. Effect

Active Publication Date: 2014-12-24
ZHONGYE-CHANGTIAN INT ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual production process, the thickness of the material layer may change. For example, due to the influence of market factors, raw material storage factors, and sinter storage factors, it is necessary to adjust the sinter output and then adjust the sinter material volume, thereby affecting the trolley. layer thickness on the trolley, or, due to machine failure or other non-adjusting reasons, can also cause changes in the layer thickness on the trolley
In this way, the sintering end point will deviate from the fixed position, and the sintering quality cannot be guaranteed
[0005] In order to adapt to different sintering processes, in the existing sintering process, the main exhaust fan of the sintering machine system operates according to the maximum design power, which will inevitably lead to excessive power consumption and loss

Method used

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  • Negative pressure control method and negative pressure control system for main exhaust fan of sintering machine
  • Negative pressure control method and negative pressure control system for main exhaust fan of sintering machine
  • Negative pressure control method and negative pressure control system for main exhaust fan of sintering machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] figure 2 It is a flow chart of the method for controlling the negative pressure of the main exhaust fan provided in Embodiment 1 of the present application.

[0047] like figure 2 As shown, the method includes:

[0048] S201: Measure the material layer thickness of the material on the sintering trolley.

[0049] In this embodiment, the thickness of the material layer of the material can be measured by a direct detection method, or the material layer thickness of the material can be calculated by indirectly detecting the amount of material discharged by the distributing machine per unit time. Since the material layer on the sintering machine trolley usually takes 40 minutes or more from the sintering start point to the sintering end point during the sintering process, this results in that when detecting the material layer thickness, the closer to the sintering end point, the greater the time lag for starting adjustment. big. Therefore, in the embodiment, when the t...

Embodiment 2

[0103] image 3 It is a flow chart of the method for controlling the negative pressure of the main exhaust fan provided in the second embodiment.

[0104] according to image 3 As shown, steps S301-S303 are equivalent to steps S201-S203 in Embodiment 1. For detailed descriptions of steps S301-S303, please refer to the description of steps S201-S203 in Embodiment 1 above, which will not be repeated here.

[0105] S304: Detect the smoke components in the unit volume of smoke in the large flue according to the preset time interval.

[0106] Here, in this embodiment, the flue gas component in the unit volume flue gas in the large flue is O in the unit volume flue gas 2 , CO, CO 2 , N 2 , NO, NO 2 content. When detecting the smoke composition of the large flue, the smoke composition of the large flue is detected according to the preset time interval, which can make the detection more adaptable to the change of the system load. For example, when the system load, such as mater...

Embodiment 3

[0125] This example refers to Figure 4 process shown. according to Figure 4 As shown, steps S401-S406 are equivalent to steps S201-S206 in Embodiment 1. For detailed descriptions of steps S401-S406, please refer to the description of steps S201-S206 in Embodiment 1 above, which will not be repeated here.

[0126] S407: Calculate the difference between the target negative pressure of the large flue obtained from two adjacent calculations.

[0127] S408: Determine whether the difference is greater than a preset value.

[0128] When the judgment result is greater than, execute step S409; otherwise, execute step S410.

[0129] S409: Use the currently calculated target negative pressure of the large flue as an adjustment parameter.

[0130] S410: Using the mean value of the large flue target negative pressure obtained by two adjacent calculations as an adjustment parameter.

[0131] S411: Send the adjustment parameter to the controller of the main exhaust fan.

[0132] When...

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Abstract

The application discloses a negative pressure control method and a negative pressure control system for a main exhaust fan of a sintering machine. The method includes the following steps: the thickness of the material on a sintering pallet is measured, the vertical sintering speed of the material is calculated, and the effective air volume of each bellows is determined; the flue gas components of a large flue are detected; according to the detected flue gas components, the effective air rate of each bellows is calculated; material resistance corresponding to the material thickness is queried; target large flue negative pressure is calculated; the target large flue negative pressure as a regulating parameter is sent to a main exhaust fan controller, the main exhaust fan controller regulates the frequency of the main exhaust fan to change toward target frequency, and the target frequency is equal to the frequency corresponding to the target large flue negative pressure. After material thickness is changed, the negative pressure of the main exhaust fan can be automatically and accurately regulated to match with the current material thickness, and under the premise of guaranteeing sintering quality, the energy consumption of the main exhaust fan can be reduced in the process of sintering.

Description

technical field [0001] The present application relates to the technical field of sintering technology, in particular to a negative pressure control method and system for a main exhaust fan of a sintering machine. Background technique [0002] With the rapid development of modern industry, the scale of steel production is getting larger and larger, and energy consumption is also increasing. Energy conservation and environmental protection indicators have become an important factor in the steel production process. In iron and steel production, iron-containing raw material ore needs to be processed by sintering system before entering blast furnace smelting. , placed on the sintering trolley and roasted to cause a series of physical and chemical changes to form sintered ore that is easy to smelt. This process is called sintering. [0003] The sintering system mainly includes a sintering trolley, a mixer, a main exhaust fan, a ring cooler and other equipment. For the general pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27B21/14
Inventor 袁立新孙超申伟杰卢杨权高鹏双
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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