CN103033034A

CN103033034A - Novel furnace bottom structure and material of arc transferring plasma furnace

Info

Publication number: CN103033034A
Application number: CN2013100009675A
Authority: CN
Inventors: 孙晓冰
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-01-05
Filing date: 2013-01-05
Publication date: 2013-04-10

Abstract

The invention relates to a novel furnace bottom structure and a material of an arc transferring plasma furnace. In order to improve the conducting reliability of the furnace bottom electrode of the arc transferring plasma furnace, the full conducting and fire resistant furnace bottom lining for the furnace bottom of the arc transferring plasma furnace provided by the invention adopts a two-layer structure, wherein the layer which is in contact with a furnace bottom steel cylinder is an insulation aluminum oxide brick structure, and a steel leading-out conductive electrode is embedded in the structure; and a structure layer which is formed by sintering antioxidant magnesium-carbon bricks and magnesium oxide-graphite-resin in a knotting manner is arranged on the insulation aluminum oxide brick layer (namely the inner layer in contact with furnace material. The invention further provides the material ratio adopted by a sintered furnace lining for the inner layer of the furnace bottom of the arc transferring plasma furnace.

Description

A kind of novel transferred arc plasma furnace bottom construction and material

Technical field

The invention belongs to novel device manufacturing technology field, particularly structure and the material of a kind of heat-resisting, refractory slag corrosion of novel transferred arc plasma furnace, conducting hearth.

Background technology

With development in science and technology, the plasma heating furnace that can produce high temperature (temperature can reach more than the 7000K) flame stream need to be used in the fields such as metallurgy, environmental protection, harm offal treatment.Various materials all gasify, dissociate even ionize in the hot flame stream more than 5000K.Therefore process the harm discarded object with plasma heating furnace and be considered at present one of the most reliable method.For improving the efficient of plasma heating furnace, mostly recommend with shifting the camber plasma heating furnace.The dependability that shifts at present the hearth electrode of camber plasma heating furnace still has some deficits: mainly be that resistance fluctuation is larger in the course of work, and then affect the stability of transferred arc and the operating efficiency of plasma heating furnace.The present invention provides a kind of heat-resisting, refractory slag corrosion of novel transferred arc plasma furnace, the structure of conducting hearth and the material of use thereof.

Summary of the invention:

Conduction reliability for the hearth electrode of the transfer camber plasma heating furnace of the hearth electrode that improve to shift the camber plasma heating furnace will have certain electric conductivity when guaranteeing its heat resistance (refractoriness) and chemical stability.The present invention changes to be used in the past and imbeds the structure that graphite electrode, part graphite electrode expose on the bottom lining surface in the refractory material furnace bottom for this reason; Using instead has the distributed graphite electrode of imbedding in the fire-resistant bottom lining of full conduction, the bottom lining, connect that metal electrode is derived but with the structure of body of heater insulation.Referring to Fig. 1.

Bottom lining is double-layer structure (referring to Fig. 1).Contacted with the furnace bottom steel cylinders is insulating oxide aluminium brickwork construction, guarantee with the insulation of furnace bottom steel cylinders.Imbed steel and drawn conductive electrode.(being internal layer, with the contacted internal layer of furnace charge) is that anti-oxidant magnesia carbon brick is built and magnesia-graphite-resin knotting sintering structure layer (referring to Fig. 1) on the brick layer of insulating oxide aluminium.The material that this internal layer magnesia-graphite-resin knotting sintered lining uses is:

1) refractoriness is at the fused magnesite more than 1770 ℃: the particle size range of the fused magnesite of use: 2-4mm, and 1-2mm, 0-1mm, and particle diameter is less than the electrofusion magnesia powder of 0.2mm.The consumption proportion of the fused magnesite of different-grain diameter and the consumption of electrofusion magnesia powder are determined according to concrete body of heater size.

2) graphite powder: particle size range; 70-150 μ m.

3) aluminium powder: particle size range; 40-70 μ m.

And have

The linear phenol-aldehyde resin of molecular structure (Novolak) resin; Crosslinking agent hexa (Hexa) and the coal tar of resin.The material mixture ratio that internal layer knotting sintered lining uses is listed in table 1.

Table 1. shifts the material mixture ratio that camber plasma heating furnace furnace bottom internal layer knotting sintered lining uses

For guaranteeing to draw conductive electrode and the insulation of stove steel cylinders, drawing the conductive electrode overcoat at steel has the aluminium oxide insulating sleeve.

Description of drawings

Fig. 1, a kind of novel transferred arc plasma furnace bottom construction schematic diagram.

Among the figure: 1-furnace bottom steel cylinders; 2-insulating oxide aluminium brickwork construction layer;

The 3-magnesia carbon brick is built and magnesia-graphite-resin knotting sintering structure internal layer;

4-electrode jacket alumina insulation sleeve; The 5-steel is drawn conductive electrode;

6-discharging opening and refractory stoppers.

Claims

1. the fire-resistant bottom lining of the full conduction of furnace bottom that shifts the camber plasma heating furnace is double-layer structure; Contacted with the furnace bottom steel cylinders is insulating oxide aluminium brickwork construction, has imbedded steel and has drawn conductive electrode.(being internal layer, the internal layer that contacts with furnace charge) builds and magnesia-graphite-resin knotting sintering structure layer for anti-oxidant magnesia carbon brick on the brick layer of insulating oxide aluminium.

2. shift the material mixture ratio that camber plasma heating furnace furnace bottom internal layer knotting sintered lining uses

3. be used for the harm offal treatment and shift the furnace bottom of camber plasma heating furnace, change to be used in the past and imbed the structure that graphite electrode, part graphite electrode expose on the bottom lining surface in the refractory material furnace bottom; Using instead has the distributed graphite electrode of imbedding in the fire-resistant bottom lining of full conduction, the bottom lining, connect that metal electrode is derived but with the structure of body of heater insulation.