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Novel double-electrode direct-current arc system for melting wastes

A DC arc and double-electrode technology, which is applied in the field of new double-electrode DC arc system, can solve the problems that are not obvious in Figure 1, it is difficult to accurately adjust the heating and temperature of the molten pool, and the stirring of the molten pool is insufficient, so as to speed up the melting ability, The effect of maximizing melting rate and optimizing unit energy consumption

Active Publication Date: 2017-08-08
JIANGSU TIANYING ENVIRONMENTAL PROTECTION ENERGY COMPLETE EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Relying on parameters such as arc current and electrode position (through the lifting device 12a and 12b) to adjust will lead to changes in the impedance, current distribution and temperature distribution of the entire molten pool, and it is difficult to accurately adjust the local heating and temperature of the molten pool
[0008] 3. Same as 2, because the current is distributed horizontally (parallel to the surface of the molten pool), the electromagnetic stirring effect ( figure 1 species marked with a semicircular arrow) is not obvious, and the stirring of the molten pool is not sufficient

Method used

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  • Novel double-electrode direct-current arc system for melting wastes
  • Novel double-electrode direct-current arc system for melting wastes
  • Novel double-electrode direct-current arc system for melting wastes

Examples

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Effect test

no. 1 example

[0044] As an implementation, the double electrodes are arranged symmetrically along the central axis of the melting furnace, and are arranged on a plane passing through the central axis with the fly ash feed port and the slag discharge port, such as figure 2 shown.

[0045] The typical material of the double electrode is graphite, which is rod-shaped. Either hollow graphite rods or solid graphite rods can be used. When the hollow graphite rod is used, the hollow channel of the electrode rod can be fed with working gas to stabilize the arc. Typical working gases are argon and nitrogen; when solid graphite electrodes are used, no working gas is required. The bottom conductive member 28 is paved with conductive refractory material or graphite disc, with a typical thickness of 200mm. A certain amount of arc ignition agent (typically steel balls or coke) is put into the furnace body, and the two electrodes 21a, 21b are contacted with the arc ignition agent to start the arc thro...

no. 2 example

[0047] As a second embodiment, the double electrodes 21a and 21b are symmetrically arranged along the central axis of the melting furnace, and the fly ash feed port and the slag discharge port are arranged on a plane passing through the central axis. The plane where the double electrodes are located is perpendicular to the plane where the fly ash inlet and slag outlet are located, such as image 3 shown. The double electrodes and the bottom conductive member 28 are the same as those in the first embodiment. Different from Embodiment 1, the lifting system 22a, 22b contacts the graphite disc to start the arc, pulls up the electrode to maintain the arc, and puts in the fly ash raw material after the graphite is red hot to make it melt. When the molten pool rises to the level of the slag outlet, the fully melted fly ash slag overflows out of the slag outlet and is cooled.

[0048] According to the above two embodiments, the system can more effectively melt the fly ash pool, maxi...

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Abstract

The invention discloses a novel double-electrode direct-current arc system for melting wastes. The novel double-electrode direct-current arc system solves the technical problem of technical defects existed in an existing double-electrode arc technology aiming at the background technology. The adopted technical scheme is characterized in that the novel double-electrode direct-current arc system for melting the wastes comprises a melting furnace, a melting furnace body provided with a fly ash feed inlet and a slag discharge opening, double electrodes vertically inserted into the furnace body, and two lifting systems which are in one-to-one correspondence to the double electrodes and used for adjusting the heights of the double electrodes relative to the surface of a melting pool, wherein the space between the double electrodes vertically inserted into the furnace body is more than two times larger that the height of the melting pool; the two electrodes are connected onto a negative pole and a positive pole of a direct-current power supply; a furnace bottom conductive piece is arranged at the bottom part of the furnace body; and the conductivity of the furnace bottom conductive piece is more than two orders of magnitude higher than the conductivity for melting the wastes. The novel double-electrode direct-current arc system for melting the wastes has the advantages that current distribution in the melting pool is improved, and the fly ash melting pool can be more effectively melted.

Description

technical field [0001] The present invention relates to a novel two-electrode DC arc system for waste melting. Background technique [0002] DC arc melting technology is currently the most commonly used waste melting furnace method. The existing single-electrode DC arc (hereinafter collectively referred to as single-electrode arc) is inherited from the DC steelmaking furnace technology, and there are problems such as difficult maintenance of the furnace bottom electrode and insufficient melting capacity of the single electrode to the molten pool. Double-electrode DC arc (hereinafter collectively referred to as double-electrode arc) melting technology, such as Hitachi Zosen’s JPH08240306 and JP2003336826, and Tetronics’ US2010 / 0078409 patents, do not require bottom electrodes and have better arc ignition and melting. Process flexibility. In addition, JPH09243267A of TAKUMA Company discusses the technology of using a double-electrode system to prevent the cooling of the slag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
CPCB09B2101/30B09B3/20
Inventor 钟雷吕浩莫德禧李要建
Owner JIANGSU TIANYING ENVIRONMENTAL PROTECTION ENERGY COMPLETE EQUIP CO LTD
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