Smoke amount measuring and control device and smoke amount measuring and control method of semi-closed ferroalloy submerged arc furnace

A ferroalloy, flue gas volume technology, applied in the direction of furnace control devices, furnaces, furnace components, etc., can solve problems such as malfunction of the electric control system of the furnace door and large difference in flue gas volume, achieve high sensitivity, avoid misoperation, Avoid the effect of false movement

Active Publication Date: 2014-12-10
广西铁合金有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The position of the probe inserted into the chimney is different, and the measured flue gas volume varies greatly. Human factors directly affect the measurement results, resulting in misoperation of the electric control system of the furnace door.

Method used

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  • Smoke amount measuring and control device and smoke amount measuring and control method of semi-closed ferroalloy submerged arc furnace
  • Smoke amount measuring and control device and smoke amount measuring and control method of semi-closed ferroalloy submerged arc furnace

Examples

Experimental program
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Effect test

Embodiment 1

[0044] The invention is applied to flue gas volume measurement and control for flue gas waste heat power generation. A 20MVA manganese-silicon ferrosilicon alloy submerged arc furnace is equipped with a flue gas waste heat boiler. The flue gas in the furnace is exchanged through the waste heat boiler under the action of the frequency conversion induced draft fan, and then sent to the bag dust removal device to purify the flue gas. The flue gas purified by the bag Exhaust from the exhaust stack. The flue gas waste heat power generation pipeline and waste heat boiler system require the flue gas volume to be controlled at 30000Nm 3 / h~530 million N m 3 / h range. The above objectives can be achieved through the following implementation methods.

[0045] Install the probe of the sensor at a height of 2-3 meters in the purified flue gas exhaust pipe after the flue gas dedusting of the submerged arc furnace, and extend the probe into any position in the exhaust cross-section to sa...

Embodiment 2

[0047] The invention is applied to the dedusting and purification treatment of the flue gas of the submerged arc furnace. A company's 2×25MW submerged arc furnace flue gas dust collector system, the exhaust capacity and pressure head can meet the maximum load requirements. The submerged arc furnace door of the dust removal system is equipped with an electric switch device. The company originally controlled the amount of air inhaled by the furnace by manually controlling the size of the furnace hood door. The dust collector is designed to treat the flue gas volume of the filter bag, that is, the rated flue gas volume is 250000Nm 3 / h, minimum not less than 150000Nm 3 / h, an adjustable mechanical cooler is set in front of the dust collector, and the cooling capacity can meet the requirements of the worst furnace conditions. The following implementation methods can be used to ensure that the flue gas volume treated by the filter bag of the dust collector is within the rated flu...

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Abstract

The invention discloses a smoke amount measuring and control device and a smoke amount measuring and control method of a semi-closed ferroalloy submerged arc furnace. The measuring and control device comprises a processor which is connected with an oxygen content sensor through an oxygen content analyzer. A probe of the oxygen content sensor is inserted into a flue or a chimney of the semi-closed ferroalloy submerged arc furnace. The processor is connected with an electric energy meter of the semi-closed ferroalloy submerged arc furnace through an AD conversion module. The processor is connected with an electric control system of the semi-closed ferroalloy submerged arc furnace through a drive relay. The smoke amount measuring and control device measures and controls the smoke amount according to the oxygen content of smoke and the current power of the submerged arc furnace, sensitivity is high, and the problem that measured smoke amounts are different due to the fact that a probe of a currently-used measuring device is different in probe sampling points and insertion positions in the chimney of the probe are different can be effectively solved.

Description

technical field [0001] The invention relates to the field of ferroalloy production, in particular to the flue gas treatment project of manganese-based ferroalloy semi-closed submerged arc furnaces and the measurement and control of the flue gas volume of the flue gas waste heat power generation system. Background technique [0002] Iron alloys (including Si-Fe, Mn-Fe, Cr-Fe, Mn-Si-Fe, etc.) are alloys obtained by redox reactions in submerged arc furnaces. During the smelting process, a large amount of flue gas will be produced. Both the dust removal project and the flue gas waste heat utilization project need to measure the flue gas volume and effectively control it. [0003] At present, most of the methods for measuring the amount of flue gas are measured by pitot tubes, averaging tube flowmeters, and heat balance mass flowmeters. Due to the large difference in flue gas velocity at different positions in the same cross-section of the chimney, the flue gas volume measured ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27D19/00F27D21/00
Inventor 曾世林贾艳桦农韦健苏继才黄祖诚黄积福陈忠健赵洪洋
Owner 广西铁合金有限责任公司
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