An Immersed Ceramic Resistance Internal Heating Device

A ceramic resistance and internal heating technology, applied in electric heating devices, ohmic resistance heating, electric furnace heating, etc., can solve problems such as limiting the popularization and application of internal heating technology, molten liquid charging or liquid level jumping, and internal heater failure, etc. Suppression of interfacial discharge, remarkable melt infiltration, and long service life

CN105509488BActive Publication Date: 2017-09-12XIAN CHAOMA SCI TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2017-09-12

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Abstract

The invention provides an internal heating device with an immersive ceramic resistor. The internal heating device comprises a transformer and a molten pool, wherein a resistance tube and a first electrode are inserted into the molten pool; the upper end of the resistance tube is opened, and the lower end of the resistance tube is closed; both the molten pool and the resistance tube are filled with molten metal; a second electrode is inserted into the resistance tube; the lower parts of both the first electrode and the second electrode are immersed to the molten metal, and the upper parts of both the first electrode and the second electrode are connected with the transformer through conducting wires; and a silicon carbide coating is deposited on each of the inner and outer walls of the resistance tube. According to the internal heating device, the resistance tube, the electrodes, the molten metal and the transformer form a safety circuit, and energy required by the heating and heat preservation of the molten metal is provided by heat generated by the resistance tube, so that discharge failure on an interface of the resistance tube can be effectively avoided. Compared with the existing internal heating technology, the internal heating device has the characteristic of structure and function integration and also has higher safety and operation stability.
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Description

technical field

[0001] The invention belongs to the technical field of heaters, and in particular relates to an immersion-type ceramic resistance internal heating device. Background technique

[0002] In recent years, with the implementation of the national "Eleventh Five-Year" energy-saving policy, it has become a consensus in the development of the industry to adopt new materials and new processes to carry out energy-saving transformation of high-energy-consuming industries such as non-ferrous metal smelting. Among them, the internal heating technology of molten metal has been widely recognized at home and abroad. The basic principle is to insert the internal heater with a self-heating source directly into the molten metal, transfer the heat to the molten metal through the isolation sheath, and then The molten metal achieves thermal balance through its own heat conduction and convection, and then heats and keeps the molten metal. Compared with the "external heating" metho...

Examples

Embodiment 1

[0032] Such as figure 1 As shown, the immersion-type ceramic resistance internal heating device of this embodiment includes a transformer 7 and a molten pool 9, and a resistance tube 1 and a first electrode 6-1 are inserted in the molten pool 9, and the upper end of the resistance tube 1 is opened at the lower end Closed, the melting pool 9 and the resistance tube 1 are filled with molten metal 8, the resistance tube 1 is inserted with a second electrode 6-2, the first electrode 6-1, and the second electrode 6 The lower part of -2 is immersed in the molten metal 8, and the upper parts of the first electrode 6-1 and the second electrode 6-2 are connected to the transformer 7 through wires, and carbonization is deposited on the inner wall and the outer wall of the resistance tube 1. Silicon coating.

[0033] Such as figure 1 As shown, the top of the resistance tube 1 is provided with an insulating cover plate 3, and the insulating cover plate 3 is provided with a vent pipe 4 f...

Embodiment 2

[0051] The immersion-type ceramic resistance internal heating device of this embodiment is the same as that of Embodiment 1, except that the silicon carbide coating and the preparation method of the resistance tube 1 are different. Wherein, the preparation method of the silicon carbide coating is: placing the resistance tube 1 in a chemical vapor deposition furnace, using CH 3 SiCl 3 As a raw material, hydrogen is used as a carrier gas, and argon is used as a diluent gas. The hydrogen flow rate is 400mL / min, the argon flow rate is 150mL / min, and the temperature is 1000°C. A silicon carbide coating is obtained. The preparation method of the resistance tube 1 comprises the following steps:

[0052] Step 1. Weigh the following raw materials in mass percentage: SiC 50%, graphite 33%, Y 2 o 3 3%;Al 2 o 3 2%; Ni 4%; Mo 4%, TiC 4%; all raw materials are powder, graphite is preferably nano-graphite powder;

[0053] Step 2. Mix the raw materials weighed in step 1 evenly by ball ...

Embodiment 3

[0063] The immersion-type ceramic resistance internal heating device of this embodiment is the same as that of Embodiment 1, except that the silicon carbide coating and the preparation method of the resistance tube 1 are different. Wherein, the preparation method of the silicon carbide coating is: placing the resistance tube 1 in a chemical vapor deposition furnace, using CH 3 SiCl 3 As a raw material, hydrogen is used as a carrier gas, and argon is used as a diluent gas. The hydrogen flow rate is 200mL / min, the argon flow rate is 100mL / min, and the temperature is 1200°C. A silicon carbide coating is obtained. The preparation method of the resistance tube 1 comprises the following steps:

[0064] Step 1. Weigh the following raw materials in mass percentage: SiC 60%, graphite 28%, Y 2 o 3 1.5%;Al 2 o 3 1.5%; Ni 3%; Mo 3%, TiC 3%; all raw materials are powder, graphite is preferably nano-graphite powder;

[0065] Step 2. Mix the raw materials weighed in step 1 evenly by b...