Method for increasing flue gas temperature of semi-closed submerged arc furnace

A technology of flue gas temperature and submerged arc furnace, which is applied to furnaces, furnace components, furnace control devices, etc., can solve the problems of excessive cold air, uneven pressure in the furnace, electrode stab fire, etc., so as to increase the flue gas temperature and reduce the Consume, reduce contact effect

Inactive Publication Date: 2021-02-19
内蒙古鄂尔多斯电力冶金集团股份有限公司
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for increasing the flue gas temperature of a semi-closed submerged arc furnace aiming at the problems of excessive cold air caused by negative pressure operation requirements in the prior art and uneven pressure in the furnace caused by electrode stabbing

Method used

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  • Method for increasing flue gas temperature of semi-closed submerged arc furnace
  • Method for increasing flue gas temperature of semi-closed submerged arc furnace
  • Method for increasing flue gas temperature of semi-closed submerged arc furnace

Examples

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Effect test

Embodiment 1

[0027] Embodiment one: if Figure 1 to Figure 3 As shown, a method for increasing the flue gas temperature of a semi-closed submerged arc furnace. The semi-closed submerged arc furnace includes a fume hood 2, an electrode 3, a chimney 4, a chimney opening rate regulating valve 5, a pressure sensor 1, and a flue gas waste heat recovery and utilization device 6. The induced draft fan 7, the induced draft fan frequency converter 8, the controller, the smoke hood 2 includes the feeding port and the furnace operation door, the chimney 4 is connected with the smoke hood 2, the electrode 3 penetrates the smoke hood 2 and forms a triangular area of ​​the electric furnace. The charging port on the cover 2, the furnace operation door, the chimney 4 inlet, and the electric furnace triangular area are arranged with a pressure sensor 1, and a chimney opening rate regulating valve 5 is installed in the chimney 4. Among them, No. 1 furnace pressure detection point 1-1 is arranged in the tria...

Embodiment 2

[0034] Embodiment 2: On the basis of Embodiment 1, set the furnace pressure reference value P 0 ∈ΔP,P 0 Generally -10Pa.

[0035] In order to make the furnace pressure close to P 0 , when the pressure value acquired by pressure sensor 1 deviates from P 0 , if the pressure value cannot return to P within the set time 0 , automatically adjust the frequency of the induced draft fan inverter 8 again, and adjust the pressure in the furnace again; when the obtained pressure value returns to P 0 , the frequency of the frequency converter 8 of the induced draft fan is automatically adjusted again to reduce the pressure change in the furnace.

Embodiment 3

[0036] Embodiment 3: On the basis of any one of Embodiment 1 to Embodiment 2, when the pressure value obtained by pressure sensor 1 rises to higher than P in a short time max , it is considered as a large collapse, and the controller accumulates the number of collapses once. The obtained number of collapses can be used as one of the basis for judging the furnace condition and provide necessary reference for the operator.

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Abstract

The invention provides a method for increasing the flue gas temperature of a semi-closed submerged arc furnace, and relates to recycling of waste heat in the submerged arc furnace. Pressure of multiple positions in a smoke hood is measured through a sensor, the measured pressure value is compared with a target pressure value through a controller, an induced draft fan and chimney opening rate adjusting valves are controlled, and therefore, the pressure of each position in the furnace is controlled within the target pressure value range. The pressure in the furnace is prevented from being too low or too high, excessive cold air is prevented from entering the furnace, the smoke temperature is increased, and the pressure balance of each position in the furnace is maintained.

Description

technical field [0001] The invention belongs to the technical field of metal smelting equipment, and relates to recovery and utilization of waste heat from a submerged arc furnace, in particular to a method for increasing the flue gas temperature of a semi-closed submerged arc furnace. Background technique [0002] At present, the domestic environmental protection policy is becoming increasingly strict, and the competition in the metal smelting industry is fierce. From the perspective of environmental protection and profit, the energy recovery and utilization of smelting equipment plays a very important role in saving energy, reducing consumption and reducing production costs. As an important metal smelting equipment, the semi-hermetic submerged arc furnace utilizes the waste heat energy of the flue gas generated in the smelting process, which is an important way of energy recovery and utilization. [0003] The waste heat energy utilization of semi-closed submerged arc furna...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D19/00
CPCF27D19/00F27D2019/0009F27D2019/0028
Inventor 王东雄赵志刚刘坤仑鲁德云邸俊明颜艺专牛强
Owner 内蒙古鄂尔多斯电力冶金集团股份有限公司
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