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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, applied in the field of sintering process, can solve the problems of high power consumption and loss, and achieve the effect of saving power, reducing energy consumption and saving power.

Active Publication Date: 2013-04-10
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to adapt to the impact of changes in the thickness of the material layer and the speed of the trolley on the sintering quality, in the existing sintering process, the main exhaust fan of the sintering machine system operates at 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
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Effect test

Embodiment 1

[0045] 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.

[0046] Such as figure 2 As shown, the method includes:

[0047] S201: Measure the material layer thickness of the material on the sintering trolley.

[0048] 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 th...

Embodiment 2

[0106] 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.

[0107] according to image 3 As shown, steps S301-S304 are equivalent to steps S201-S204 in Embodiment 1. For detailed descriptions of steps S301-S304, please refer to the description of steps S201-S204 in Embodiment 1 above, which will not be repeated here.

[0108] S305: Detect the smoke components in the unit volume of smoke in the large flue according to the preset time interval.

[0109] 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 mate...

Embodiment 3

[0128] This example refers to Figure 4 process shown. according to Figure 4 As shown, steps S401-S407 are equivalent to steps S201-S207 in Embodiment 1. For detailed descriptions of steps S401-S407, please refer to the description of steps S201-S207 in Embodiment 1 above, which will not be repeated here.

[0129] S408: Calculate the difference between the target negative pressure of the large flue obtained from two adjacent calculations.

[0130] S409: Determine whether the difference is greater than a preset value.

[0131] When the judgment result is greater than, execute step S410; otherwise, execute step S411.

[0132] S410: Use the currently calculated target negative pressure of the large flue as an adjustment parameter.

[0133] S411: Using the mean value of the large flue target negative pressure obtained by two adjacent calculations as an adjustment parameter.

[0134] S412: Send the adjustment parameters to the main exhaust fan controller.

[0135] When the tar...

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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 and the speed of a sintering pallet are 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 the material thickness or the speed of the sintering pallet is changed, the negative pressure of the main exhaust fan can be automatically and accurately regulated to match with the current material thickness and the speed of the sintering pallet, 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 Applications(China)
IPC IPC(8): F27B21/14
Inventor 袁立新孙超卢杨权申伟杰高鹏双
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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