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Dust removal and purification of smelting flue gas of submerged arc furnace and comprehensive utilization method of sensible heat and latent heat

A technology for smelting flue gas and submerged arc furnaces, applied in furnaces, waste heat treatment, furnace components, etc., can solve the problems of inability to remove dust from flue gas, low dust removal efficiency of mechanical dust collectors, and high tar content

Active Publication Date: 2016-04-13
CHENGDU INTERMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned flue gas dust removal and purification treatment measures can neither completely remove dust and purify the flue gas generated during the smelting process of the submerged arc furnace, nor can it fully recover and utilize the sensible heat and latent heat of the flue gas smelted by the submerged arc furnace
In addition, due to the high tar content of the flue gas generated in the submerged arc furnace oven, continuing to use the bag filter to treat it will quickly cause the bag to be contaminated by tar and other sludge substances and cause the bag to be blocked; while mechanical dust removal The dust removal efficiency of the dust collector (such as the gravity dust collector) is not high, and the installation and use of the electric dust collector is not economical

Method used

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  • Dust removal and purification of smelting flue gas of submerged arc furnace and comprehensive utilization method of sensible heat and latent heat
  • Dust removal and purification of smelting flue gas of submerged arc furnace and comprehensive utilization method of sensible heat and latent heat
  • Dust removal and purification of smelting flue gas of submerged arc furnace and comprehensive utilization method of sensible heat and latent heat

Examples

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Effect test

Embodiment 1

[0026] A submerged arc furnace smelting system for smelting aluminum-silicon alloys, using the above-mentioned figure 1 Shown system composition and process flow. Among them, the first high-temperature flue gas filtering device 310 and the second high-temperature flue gas filtering device 420 both use high-temperature-resistant sintered iron-aluminum intermetallic compound porous material filter elements; figure 2As shown, the gas waste heat recovery and utilization device 500 includes a first heat exchanger 510 connected to the gas delivery pipeline between the second high-temperature flue gas filter device 420 and the fan 440 for the gas purification and recovery system. The first heat exchanger 510 510 is connected to a steam generator set 530, the gas cabinet 460 is connected to a gas boiler 520, and the high-temperature gas 220 discharged from the second high-temperature flue gas filter device 420 passes into the first heat exchanger 510 to generate heat with the low-tem...

Embodiment 2

[0028] Such as image 3 As shown, on the basis of Embodiment 2, the gas waste heat recovery and utilization device 500 is changed to: the gas cabinet 460 is connected to a gas turbine 550, and the gas turbine exhaust heat exchanger 560 is connected between the steam generator set 530 and the gas turbine 550, and the second high temperature The high-temperature gas 220 discharged from the flue gas filter device 420 passes into the first heat exchanger 510 to exchange heat with the low-temperature circulating water from the steam generator set 530, and the gas discharged from the first heat exchanger 510 cools down to below 230°C and enters the gas cabinet 460, the gas from the gas cabinet 460 is exported and passed into the gas turbine 550 for combustion and drives the gas turbine 550 to generate electricity. The high-temperature exhaust gas generated by the gas turbine 550 is exported and passed into the gas turbine exhaust heat exchanger 560. The circulating water 710 passes ...

Embodiment 3

[0030] Such as Figure 4 As shown, on the basis of Example 2, in the oven stage of the submerged arc furnace 110, the following method is adopted to recover and utilize the purified gas discharged from the first high-temperature flue gas filtering device 310: the first high-temperature flue gas filtering device The purified gas discharged from 310 (the outlet temperature is about 320°C) is passed into the second heat exchanger 810 to exchange heat with the compressed nitrogen gas from the gas source 421, and then the heated gas discharged from the second heat exchanger 810 is The compressed nitrogen gas 412a is passed into the second high-temperature flue gas filtering device 420 for preheating; in the stage of releasing the smelted products of the submerged arc furnace 110, the following methods are adopted to recover and utilize the waste heat of the purified gas of the first high-temperature flue gas filtering device 310: The purified gas (outlet temperature is about 320°C)...

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Abstract

The invention discloses a method for dedusting and purifying of smelting smoke of a submerged arc furnace and comprehensive utilization of sensible heat and latent heat of the smelting smoke. By the adoption of the method for dedusting and purifying of the smelting smoke of the submerged arc furnace and comprehensive utilization of the sensible heat and the latent heat of the smelting smoke, the sensible heat and the latent heat of the smelting smoke of the submerged arc furnace can be fully recycled. The method for dedusting and purifying of the smelting smoke of the submerged arc furnace and comprehensive utilization of the sensible heat and the latent heat of the smelting smoke comprises the steps that (1) high-temperature coal gas generated at the normal smelting stage of the submerged arc furnace is recovered and is introduced into a high-temperature smoke filtering device to be filtered, dedusted and purified, and high-temperature coal gas with the dust content below 8-10mg / N m<3> is discharged by the smoke filtering device; (2) the high-temperature coal gas is introduced into a first heat exchanger, so that heat exchange between the high-temperature coal gas and low-temperature circulating water from a steam generator unit is conducted; (3) the coal gas is introduced into a gas boiler to be burnt, heated circulating water discharged by the first heat exchanger is introduced into the gas boiler at the same time, so that the circulating water is further heated through heat generated during coal gas burning, and thus overheated steam is formed; (4) the overheated steam is delivered to the steam generator unit, so that the steam generator unit is driven to generate power. A high-temperature-sintering-resistant metal porous filtering element is adopted to serve as the high-temperature smoke filtering device.

Description

technical field [0001] The invention relates to a method for dust removal and purification of smelting flue gas of a submerged arc furnace and a comprehensive utilization method of sensible heat and latent heat. Background technique [0002] During the smelting process of the submerged arc furnace, a large amount of dust-laden flue gas will be generated. Most of these flue gases are high-temperature gas produced during the normal smelting stage of the submerged arc furnace; The flue gas emitted from the outside of the submerged arc furnace during the furnace extraction process. At present, the dust removal and purification treatment of submerged arc furnace smelting flue gas is basically only for the above-mentioned high-temperature gas, and the treatment method is to use a bag filter to filter after a series of cooling, and then selectively filter the filtered gas according to the composition of the gas The gas is ignited and released or stored. The above-mentioned flue ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27D17/00
CPCY02P10/25
Inventor 高麟汪涛樊彬
Owner CHENGDU INTERMENT TECH