CN100436613C - Heater furnace to produce titanium sponge by combination method - Google Patents

Abstract

The unitedly produced titanium sponge electric heater is well type electric heater with the heater is made of a housing, a brasque and an electric heating device. The brasque is composed of firebrick, heat reserving layer and heat insulating layer, with the electric heater a resistance wire loaded on the wire resting brick, featuring in the heat insulating layer made of rock wool board (5), heat reserving layer of bulking vermiculite, having at least 8 wind inlets (1) evenly set at the center of the hearth of the heater. At least four wind outlets (2) are envenly arranged on the top of the furnace wall, with exhausting openings (3) set on the furnace wall, drawing air from the exhausting opening (3) to keep low vacuum inside the hearth, keeping the reactor (9) not being flat. It has strong radiating ability, improved reacting speed, and fine heat reserving performance, obvious in energy saving with outer wall temperature more than 10DEG C less than existing electric heaters, with a ton of titanium saving energy more than 500Kwh.

Description

Heating Furnace for Production of Sponge Titanium by Combined Method

technical field

The invention relates to the production of sponge titanium, in particular to a heating furnace for producing sponge titanium by a magnesium method.

Background technique

The process of producing sponge titanium by the combined method is to add titanium tetrachloride to the reactor, reduce and distill it with metal magnesium to obtain sponge titanium. The well-type electric heating furnace is a necessary equipment for the reduction distillation process. The reactor is placed in a well-type electric heating furnace for reduction and distillation operations. The well-type electric heating furnace is a mature equipment, but due to the characteristics of the process of producing sponge titanium by the combined method of magnesium reduction and vacuum distillation, the requirements for the well-type electric heating furnace It is obviously different from the general well-type electric heating furnace: it not only requires a certain heating function, but also because the thermal reduction reaction between titanium tetrachloride and magnesium is a strong exothermic reaction, a large amount of reaction heat needs to be discharged, so the reduction stage requires The well-type electric heating furnace has good heat dissipation capacity in the reduction reaction zone; in the distillation stage, due to the operation at high temperature and high vacuum in the reactor, the furnace shell must be sealed and equipped with an evacuation device, and the furnace must be kept in a low vacuum state during production In order to protect the reactor from deformation, the heating furnace is required to have good sealing performance and good heat preservation performance, so as to reduce power consumption and maintain the vacuum of the furnace.

The development direction of the titanium industry lies in the large-scale production of single furnaces. High requirements are put forward for the heat dissipation capacity, sealing performance and heat preservation performance of well-type electric heating furnaces. The requirements for the electric heating furnace for the process of obtaining sponge titanium by law.

Contents of the invention

The purpose of the present invention is to provide an electric heating furnace for the production of titanium sponge by a combined reduction and distillation method, which not only has a certain heating function, but also has good heat dissipation capacity in the reduction reaction zone in the reduction stage; and has better sealing performance in the distillation stage And thermal insulation performance, to be used in the joint method to produce sponge titanium.

In order to achieve the above object, the technical solution of the present invention is that the heating furnace for the production of titanium sponge by the combined method is a well-type electric heating furnace. And the electric heating body, the furnace lining is made up of refractory bricks, heat insulation layer, heat insulation layer, the electric heating body is a resistance wire installed on the wire brick, the electric heating furnace of the technical solution of the present invention is characterized in that the heat insulation layer of the furnace lining is a rock wool board, and the heat insulation layer It is expanded vermiculite, and at least 8 air inlets are evenly distributed in the middle of the heating furnace wall (reaction zone area), and at least 4 air exhaust outlets are evenly distributed on the upper part of the heating furnace wall. A certain length upwards, in order to increase the drafting force of the exhaust port on the hot air, and the furnace wall of the heating furnace is also provided with an evacuation port, which is used to evacuate the furnace chamber. The electric heating furnace of the technical solution of the present invention has strong heat dissipation capacity in the reduction stage, and strong heat preservation performance and sealing performance in the distillation stage; during production and use, the air flow speed in the furnace chamber in the reduction stage can meet the heat dissipation requirements of the reduction process, which can improve the heat dissipation performance of the reduction process. The reaction speed of the process, after the reduction is completed, block the air inlet and exhaust outlet, and start the evacuation device to evacuate to ensure the vacuum in the furnace during the distillation stage and protect the reactor from deformation. The vacuum in the furnace is also conducive to the heat preservation of the electric heating furnace .

The electric heating furnace of the technical solution of the present invention has strong heat dissipation ability, increases the reaction speed of the reduction process, has good heat preservation performance, and the outer wall temperature is lower than that of the electric heating furnace of the prior art, and the energy saving is obvious, and the electricity consumption of the distillation process is reduced. consumption.

Description of drawings

Accompanying drawing 1 is the structural representation of heating furnace of the present invention;

Accompanying drawing 1 is the schematic diagram of heat dissipation structure of the present invention;

Accompanying drawing 3 is the structural representation of furnace wall of heating furnace of the present invention;

In the figure, 1 is the air inlet, 2 is the air exhaust port, 3 is the evacuation port, 4 is the furnace shell, 5 is the rock wool board, 6 is the expanded vermiculite, 7 is the refractory brick, 8 is the wire brick, and 9 is the reactor .

Detailed ways

Example

In a titanium sponge production plant, titanium sponge is produced by combined magnesium reduction distillation method. As shown in Figure 1 and Figure 2, the well-type electric heating furnace has a furnace bottom and a furnace wall. The well-type electric heating furnace is evenly arranged with 12 air inlets 1 in the middle of the heating furnace wall, and the upper part of the heating furnace wall is evenly distributed. There are 6 exhaust outlets 2, and after the exhaust outlet 2 comes out of the furnace, there is a length vertically upwards, and an evacuation opening 3 is also arranged on the furnace wall of the heating furnace; as shown in Figure 3, the furnace wall of the well type electric heating furnace is Inside are the furnace shell 4, the furnace lining and the electric heating body in turn. The furnace lining is composed of a refractory brick 7, an insulating layer, and a heat insulating layer. The layer is expanded vermiculite6. During the reduction, the reduction reaction between magnesium and titanium tetrachloride is carried out in the reactor 9, and the heat of reaction is transferred to the wall of the reactor 9 through the melt. At this time, the air inlet 1 and the air outlet 2 are opened, and the cold air enters from the air inlet 1. In the furnace, it is heated by heat exchange with the wall of the reactor 9. As the density becomes smaller and the air rises, the high-temperature air is discharged from the furnace through the exhaust port 2, thereby achieving the purpose of dissipating the heat of reaction; when entering the distillation stage, due to the furnace body Most of them already have good thermal insulation performance, and the thermal insulation performance and sealing performance of the distillation stage can be satisfied only by insulating and sealing the air inlet 1 and the air outlet 2, and the temperature of the outer wall of the furnace is lower than that of the electric heating in the prior art When the temperature of the furnace is above 10°C, start the evacuation device to evacuate at the same time, and evacuate through the evacuation port 3 so that there is a low vacuum in the furnace to protect the reactor 9 from collapsing.

The application shows that the present invention satisfies the requirements of the reduction distillation electric heating furnace for the production of sponge titanium by the magnesium reduction distillation combined method, the reduction can be carried out at a relatively high speed, and the energy saving per ton of titanium is more than 500 kwh.

Claims (2)

1, a kind of process furnace of produce titanium sponge by combination method is an electric pit-type heating furnace, electric pit-type heating furnace has furnace bottom and furnace wall, the furnace wall is followed successively by furnace shell from outside to inside, furnace lining and electric heating element, furnace lining is by refractory brick, thermal insulation layer, thermal insulation layer is formed, electric heating element is that resistance wire is installed in and puts on the brick, the thermal insulation layer that it is characterized in that furnace lining is rock cotton board (5), thermal insulation layer is expanded vermiculite (6), and at uniform at least 8 blast inlets (1) that are provided with in middle part, process furnace furnace wall, uniform at least 4 exhaust outlets (2) that are provided with in top, process furnace furnace wall, a segment length is vertically upward arranged after exhaust outlet (2) is come out of the stove, also be provided with find time mouthful (3) on the process furnace furnace wall.

2,, it is characterized in that uniform 12 blast inlets (1) that are provided with in middle part, process furnace furnace wall, uniform 6 exhaust outlets (2) that are provided with in top, process furnace furnace wall according to the process furnace of the described a kind of produce titanium sponge by combination method of claim 1.

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