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Electric melting furnace, electric melting method and method for producing rock wool by using electric smelting red mud

An electric melting and electrode technology, which is applied in the field of electric melting furnace and electric melting red mud to produce rock wool, can solve the problems of large voltage and current fluctuations, increased production costs, and misoperation of electrical equipment, and achieve the effect of arc stability

Pending Publication Date: 2019-10-18
北京金亚润环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The first kind of fuel combustion melting furnace is divided into surface combustion melting furnace, cyclone melting furnace, etc., its disadvantage is that it produces a large amount of smoke and the tail gas treatment is complicated
The second type of electric melting furnace is divided into resistance furnace, electric arc furnace, plasma furnace, etc. The disadvantages are large power consumption and high maintenance costs.
[0004] However, there are the following problems in the arcing and ignition method of the electric melting furnace at the beginning of operation: first, the three-phase electrodes are inconsistent in arcing inside the electric melting furnace, resulting in an unbalanced three-phase current, and it is an instantaneous irregular three-phase current imbalance , which will cause malfunction of electrical equipment; second, the three-phase electrodes have intermittent arcing inside the electric melting furnace, sometimes short-circuited, sometimes arc-broken, the arc combustion is unstable, and the voltage and current fluctuate greatly, which requires repeated points The arc will cause a great impact on the power grid, and may generate high-order harmonics that will pollute the power grid and affect the safe operation of the power grid
[0006] However, there are the following problems in the process of producing rock wool using red mud as the main material in the cupola in the prior art: First, due to the high alkalinity of red mud, the corrosion resistance of the inner layer of the traditional cupola is not enough and cannot reach The production design cycle is high, and the cost of production and maintenance is high. Second, due to the high iron content in the red mud, the cupola used for the production of rock wool has no special taphole, and iron cannot be recycled. The slag outlet of the traditional rock wool cupola is located in the cupola The bottom can only be used to release iron slag, which causes waste and produces secondary tailings; third, cotton cannot be produced when iron slag is produced, and iron slag cannot be produced when cotton is produced, which requires frequent shutdowns, which seriously affects the output of rock wool products Fourth, the waste gas and dust generated in the production process of the cupola need further treatment to meet the emission standards, which increases the production cost; fifth, according to the national environmental protection requirements, it is strictly forbidden to use coke as heat in the cupola in the rock wool melting section , the use of natural gas as heat energy is also limited; Sixth, the thermal efficiency of traditional cupolas for rock wool production is low, and the thermal energy utilization rate is about 40-50%.

Method used

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  • Electric melting furnace, electric melting method and method for producing rock wool by using electric smelting red mud
  • Electric melting furnace, electric melting method and method for producing rock wool by using electric smelting red mud
  • Electric melting furnace, electric melting method and method for producing rock wool by using electric smelting red mud

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Embodiment 1

[0094] Such as figure 1 As shown, the present invention provides an electric melting furnace, including an electric melting furnace body, a control system 4 and a power supply system, the control system 4 is electrically connected to the power supply system, the power supply system includes an ignition device 3, and the electric melting furnace The body is structurally matched with the ignition device 3 , and the ignition device 3 includes a graphite electrode 31 and an electrode automatic adjustment mechanism 33 .

[0095] The graphite electrode 31 is a three-phase graphite electrode 31, and the discharge points of the three-phase graphite electrode 31 are electrically connected with resistance wires respectively; The three-phase graphite electrodes 31 are electrically connected, and the electrode lifting mechanism 331 drives the three-phase graphite electrodes 31 to lift. The main body of the electric melting furnace is provided with a channel for the graphite electrode 31 ...

Embodiment 2

[0106] On the basis of Example 1, in order to adapt the electric melting furnace to the production of inorganic fibers, especially the production of rock wool based on red mud, the following improvements are made, as Figure 1-3 As shown, the electric melting furnace body includes a furnace body 1 and a furnace cover 2; a furnace top distribution device 22 is arranged in the furnace body 1, and the furnace top distribution device 22 communicates with a feeding device through a material conveying device; The side wall of the furnace body 1 is provided with a discharge opening; the furnace cover 2 is provided with a passage hole for the graphite electrode 31 to pass through.

[0107] Wherein the inner hearth of the furnace body 1 is preferably cylindrical. The design inner diameter is preferably 360 cm, and the melting capacity is 5-8 tons per hour, preferably 6 tons.

[0108] The first layer of the furnace body 1 bottom and circumference is made of asbestos board from the outs...

Embodiment 3

[0137] According to the above embodiments, in order to solve the problem of unbalanced three-phase current when the existing electric melting furnace starts arcing, the present invention provides an electric melting method, which uses the electric melting furnace to process materials, and the steps mainly include:

[0138] 1) Preparation before operation;

[0139] 2) Fabric;

[0140] 3) charge preheating;

[0141] 4) molten pool generation;

[0142] 5) The ignition device 3 ignites and starts the arc;

[0143] 6) Maintain production, form melting rated current, melting rated voltage, melting rated power, and operate stably;

[0144] 7) Output stream, when the molten liquid level reaches the set height, open the discharge port, let the molten liquid stream flow out and lead it to the next material processing process.

[0145] Specifically, the pre-operation preparation in step 1) includes three steps: equipment acceptance, pre-operation drying and post-drying inspection; wh...

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Abstract

The invention provides an electric melting furnace, an electric melting method and a method for producing rock wool by using electric smelting red mud, and relates to the field of high-temperature melting. An electric melting furnace body is in structure matching with an ignition device, and electric discharging points of graphite electrodes of the ignition device are respectively and electricallyconnected with resistance wires; an electrode automatic adjusting mechanism comprises an electrode lifting mechanism, the electrode lifting mechanism is electrically connected with the three-phase graphite electrodes, and the electrode lifting mechanism drives the three-phase graphite electrode to ascend and descend; and the electric melting furnace body is provided with channels for moving the graphite electrodes. According to the technical scheme, the contact area between the three-phase graphite electrodes and a molten liquid can be adjusted, and the voltage can be converted under an on-load condition, so that electric arc heat is concentrated, the electric arc is stable, and the phenomena of large fluctuation of voltage and current, unstable arc burning, short circuit and arc breakingare avoided. Impact on the power grid in an implementation process is avoided, and no harmonic pollution is caused.

Description

technical field [0001] The invention belongs to the field of high-temperature melting, and in particular relates to an electric melting furnace, an electric melting method and a method for producing rock wool by electric melting red mud. Background technique [0002] At present, there are two types of representative melting furnaces on the market: the first type is a fuel-burning melting furnace, and the second type is an electric melting furnace. The first kind of fuel combustion melting furnace is divided into surface combustion melting furnace, cyclone melting furnace, etc., and its disadvantage is that it produces a large amount of smoke and the tail gas treatment is complicated. The second type of electric melting furnace is divided into resistance furnace, electric arc furnace, plasma furnace, etc. The disadvantages are large power consumption and high maintenance costs. The electric melting furnace is widely used because of its advantages of less pollution and high d...

Claims

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Application Information

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IPC IPC(8): C03B5/02C03B5/24C03B5/26C03B5/42C03B37/04C03C13/06C21B13/00
CPCC03B5/025C03B5/42C03B5/24C03C13/06C03B5/26C03B37/04C21B13/0006
Inventor 张勇张银国王靖然史鑫张欣张晓义俞青平
Owner 北京金亚润环保科技有限公司
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