KR20160060824A - Thermo reduction apparatus - Google Patents

Abstract

The present invention relates to a heat reduction device. According to the present invention, the heat reduction device includes: a continuous heat reduction unit continuously reducing heat of a raw material; and a waste heat recycling unit of recycling waste heat discharged from the heat reduction unit, in the heat reduction unit. The heat reduction device comprises the waste heat recycling unit to recycle the waste heat, which is discharged from the heat reduction unit, in the heat reduction unit. So, sensible heat of a product in a cooling unit and a combustion exhaust gas in the heat reduction unit are used in a preheating unit. Therefore, energy efficiency in a whole process can be maximized so producing costs are lowered as a result. So, productivity can be improved. The heat reduction device comprises the continuous heat reduction unit which continuously reduces the heat of the raw material, thereby continuously reducing the heat of the raw material and improving the productivity.

Description

[0001] Thermo reduction apparatus [0002]

The present invention relates to a thermal reduction apparatus, and relates to a thermal reduction apparatus for recycling waste heat discharged from a thermal reduction means in a thermal reduction means.

Metal smelting methods can be divided into dry smelting, wet smelting, electrolytic smelting and chlorine smelting. Iron and most nonferrous metals obtain pure metals through dry smelting.

Typical non-ferrous metal smelting processes heat the sintered metal in briquette form to high temperature in atmospheric or vacuum atmosphere to thermally reduce the pure metal.

As an example, in order to smelt magnesium metal by a thermal reduction method, single light mixed with dolomite calcined in a metal cylindrical cylinder and a reducing agent such as ferro silicon is charged and heated to a high temperature.

When the pressure in the Retort is maintained at the same time as this heating, magnesium oxide is reduced by silicon and magnesium vapor is generated.

At this time, the magnesium vapor moves to the condensation tube which is charged to one side of the retort by the vacuum pump, and the magnesium vapor starts to condense from the inner wall surface of the condensation tube by the thermophoresis (temperature) Is accumulated.

Finally, after the generation and condensation of the magnesium vapor is completed, the condensation tube in which the magnesium is condensed is separated from the litter to recover the magnesium.

1, the raw material M is charged into the reactor 2 installed in the heating chamber 1 and is externally heated to produce a time difference And the preheating, the heating and the reduction are performed in one heating chamber 1. Specifically, the heating chamber 1 is provided with a burner 3, and the burner 3 is ignited by the air A injected through the air blower 4 together with the fuel gas F, The hot combustion gas G from the heating chamber 1 preheats the air A through the heat exchanger 5 or preheats the fuel gas F although not shown in the figure.

However, since the combustion gas G is used only for the preheating of the combustion air (A) or the fuel gas (F), the availability to the high temperature heat is limited and the air (A) and the fuel gas Even though the discharge temperature after preheating is at least 250 ° C, it is discharged directly to the outside, so that high temperature heat can not be utilized at all.

In addition, in the above-described arrangement, since the product P having a high temperature (900 ° C to 1200 ° C or more) is separated and discharged from the system intermittently and not continuously, the heat of the high temperature This is a difficult limit.

It is an object of the present invention to provide a thermal reduction apparatus for recycling waste heat discharged from a thermal reduction unit in a thermal reduction unit.

According to an aspect of the present invention, there is provided a thermal reduction apparatus including: a continuous thermal reduction unit for continuously heating a raw material; And waste heat recycling means configured to recycle the waste heat discharged from the heat reducing means in the heat reducing means.

Here, the heat reduction unit may include a preheating unit for preheating the raw material; A heat source for heating the preheated raw material; And a cooling unit for cooling a product made by thermally reducing the raw material, and the waste heat recycling unit may be configured to recycle the heat discharged from the heat exchanger or the cooling unit in the preheating unit.

Specifically, the waste heat recycling unit may include a recovered gas transfer line for transferring the sensible heat recovered gas recovered from the sensible heat of the product to the preheat unit.

The waste heat recycling unit may further include a flue gas transfer line for transferring the flue gas of the combustor from the heat exchanger to the preheating unit.

The preheater may further include a first preheating column to which the recovered gas transfer line and the exhaust gas transfer line are connected to preheat the raw material first; And a second preheating column having a direct heating member to secondarily preheat the raw material.

The first preheating zone may include an agitator for dispersing the sensible heat recovered gas introduced from the recovered gas transfer line and the combusted gas introduced from the exhaust gas transfer line, An exhaust gas transfer line may be connected to indirectly heat the raw material.

Meanwhile, in the present invention, a gate valve may be installed between the preheating part and the heat exchanger part and between the heat exchanger part and the cooling part.

Specifically, the gate valve may include: a valve body disposed between the preheating portion and the heat exchanging portion, and between the heat exchanging portion and the cooling portion; And a first blocking plate and a second blocking plate provided inside the valve body and being opened and closed as a double blocking structure.

In addition, the gate valve may include a vacuum device for evacuating the inside of the gate valve; And a gas injector for injecting an inert gas into the interior.

The preheating unit may include a preheating housing having an inlet formed to allow the raw material to enter the inlet, and an inlet door opened and closed at the inlet; And a vacuum device for evacuating the interior of the preheating housing.

The heat reducing unit may include a first separator plate that is divided into a first chamber, a second chamber, and a third chamber communicated in the direction of movement of the raw material, and is opened and closed between the first chamber and the second chamber; A reduction housing having a second separation plate opened and closed between the second chamber and the third chamber; And a condenser mounted in each of the first chamber, the second chamber, and the third chamber.

Here, the temperature of the second chamber may be kept higher than the temperatures of the first chamber and the third chamber.

In addition, the heat reducing unit may include a vacuum device for evacuating the inside of each of the first chamber, the second chamber, and the third chamber; And a gas injector injecting an inert gas into each of the first chamber and the third chamber.

The cooling unit may include a cooling housing having an outlet for discharging the product, and an outlet door for opening and closing the outlet; And a vacuum device for evacuating the inside of the cooling housing.

A transfer device may be installed in the preheating part, the heat exchanger part, and the cooling part to transfer the raw material.

In the heat reduction apparatus according to the present invention, the waste heat recycling means is constituted so that the waste heat discharged from the heat reduction means is recycled by the heat reduction means, whereby the sensible heat of the product in the cooling portion and the combusted- Accordingly, it is possible to maximize the energy efficiency of the entire process, and as a result, it is possible to lower the production cost and improve the productivity.

In addition, the present invention has the advantage that the productivity can be increased since the raw material can be thermally reduced continuously by constituting the continuous type heat reducing means continuously heating the raw material.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a conventional thermal reduction apparatus. FIG.
2 is a view illustrating a thermal reduction apparatus according to an embodiment of the present invention.
3 is a detailed configuration diagram showing the thermal reduction apparatus of FIG.

The heat reducing apparatus of the present invention is characterized in that the waste heat recycling means is constituted so as to recycle the waste heat discharged from the heat reducing means in order to improve the productivity by lowering the production cost by maximizing the energy efficiency of the entire process do.

Further, a technical feature is that a continuous heat reducing means is continuously constructed to heat the raw material in order to increase the productivity.

Hereinafter, exemplary embodiments of the present invention will be described in detail. It should be noted that the same reference numerals in the drawings denote the same components in different drawings, even if they are displayed on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

2 is a view illustrating a thermal reduction apparatus according to an embodiment of the present invention.

Referring to the drawings, the present invention includes waste heat recycling means configured to continuously recycle the waste heat discharged from the continuous heat reduction means and the continuous heat reduction means that continuously heat the raw material (M).

The heat reducing unit includes a preheating unit 110 for preheating the raw material M, a desired heat transferring unit 120 for heating the preheated raw material M, and a product P made of heat- The heat exchanger 120, and the cooling unit 130 may be sequentially arranged in this order. For reference, the pressure regulating unit 140 may be configured at the front and rear ends of the heat exchanging unit 120, and a detailed configuration of the heat reducing unit will be described later.

The waste heat recycling unit is configured to recycle the waste heat discharged from the heat exchanging unit 120 or the cooling unit 130 in the preheating unit 110.

The waste heat recycling means includes a recovered gas transfer line 210 for transferring the sensible heat recovered from the sensible heat of the material M in the cooling unit 130 to the preheating unit 110, And a flue gas transfer line 220 for transferring the flue gas of the combustor to the preheating unit 110. [

The recovered gas transfer line 210 is a gas transfer line for connecting the cooling unit 130 and the preheating unit 110. The recovered gas transfer line is a gas transfer line for connecting the preheated heat recovered gas having high- 110). That is, the raw material M passes through the heat transferring part 120 and is thermally reduced to be produced as a product P, and then is drawn into the cooling part 130 and cooled. At this time, the gas as a cooling medium flows into the cooling part 130 The gas is recovered from the sensible heat of the product P through heat exchange with the product P and then transferred to the preheating unit 110 through the recovered gas transfer line 210. Although the recovery gas transfer line 210 may be equipped with a control valve for controlling the flow rate of the gas, although not shown in the figure, the control valve is connected to the temperature measurement value of the temperature sensor (not shown) And the like.

The exhaust gas transfer line 220 is a gas transfer line for connecting the heat exchanger 120 and the preheating unit 110. The exhaust gas transfer line 220 is a gas transfer line for connecting the heat transfer unit 120 to the preheating unit 110 . That is, the combustion is performed by the combustor 124 to thermally reduce the fuel in the heat exchanger 120, and the high-temperature combustible gas generated as the combustion by-product of the combustor 124 is supplied to the preheater 110 . This exhaust gas transfer line 220 may be equipped with a control valve for controlling the flow rate of the gas, although not shown in the figure, by means of a temperature measurement of a temperature sensor (not shown) in the preheater 110 And can be appropriately controlled and adjusted.

For reference, an inert gas may be utilized for preventing the oxidation of the raw material M from the sensible heat recovery gas and the combustion gas described above.

The preheating unit 110 may include a first preliminary stage 111 for first preheating the raw material M and a second preliminary stage 112 for preheating the raw material M secondarily.

The first preheating column 111 has a structure in which the recovered gas transfer line 210 and the exhaust gas transfer line 220 are connected to each other so that the sensible recovered gas flows into the recovered gas transfer line 210, As the combustible gas is introduced through the line 220, the raw material M can be firstly preheated by the high-temperature sensible heat recovery gas and the combustible gas.

The first preliminary stage 111 may be equipped with a stirrer 111a for dispersing the sensible heat recovered from the recovered gas transfer line 210 and the combusted gas introduced from the exhaust gas transfer line 220. The stirrer 111a may be a rotary vane configured to be rotated for blowing gas as an example.

In addition, the second preliminary stage 112 is configured to secondarily preheat the first preheated raw material M through the first preliminary stage 111. In this case, in order to compensate for the fact that the preheating is not performed as desired even by the indirect heating method by the hot sensible heat recovery gas and the combustible gas, the second preliminary heat sink 112 has the heating member 112a directly mounted therein, (M) can be directly heated and preheated to a higher temperature. In addition, the recovery gas transfer line 210 and the flue gas transfer line 220 are connected to the second preliminary stage 112 together with the direct heating method of the raw material M described above, whereby the raw material M is recovered by the high- It is a matter of course that indirect heating can be performed by the gas and the combustion gas.

Here, as the direct heating member 112a, a radiant tube burner may be used as an example. The radiant tube burner does not directly heat the raw material M directly in the flame, As a heating method using fuel gas and air instead of the recycling of gas and combustion gas, it is defined herein as a direct heating method in comparison with an indirect heating method in which sensible heat recovery gas and combustible gas are recycled. The heating member is referred to as a direct heating member.

For example, as shown in FIG. 1, the gas having lost heat in the preheating unit 110 may be recycled through the circulation line 230 connected to the cooling unit 130 in the first preheater 111, Can be transferred to the cooling unit 130 and recycled, or can be discharged to the outside.

The detailed configuration of the thermal reduction apparatus will be described with reference to FIG.

3 is a detailed configuration diagram showing the thermal reduction apparatus of FIG.

The preheating unit 110 and the heat exchanging unit 120 are arranged in this order in succession. The preheating unit 110 and the heat exchanging unit 120 and the heat exchanging unit 120 A gate valve 180 may be provided between the cooling unit 120 and the cooling unit 130.

The gate valve 180 includes a valve body 180a disposed between the preheating unit 110 and the heat exchanging unit 120 and between the heat exchanging unit 120 and the cooling unit 130, And a first blocking plate 181 and a second blocking plate 182 which are provided inside the double blocking structure and are opened and closed as a double blocking structure. At this time, the reciprocating driving structure of the first blocking plate 181 and the second blocking plate 182 may be any conventional reciprocating driving method such as a hydraulic cylinder method.

The gate valve 180 may further include a vacuum device V for evacuating the interior of the gate valve 180 and a gas injector I for injecting an inert gas into the interior of the gate valve 180. The air in the gate valve 180 is removed by the vacuum apparatus V and the inert gas is injected into the vacuum chamber by the gas injector I to fill the space between the preheating unit 110 and the heat exchanging unit 120 And the gate valve 180 disposed between the heat transfer portion 120 and the cooling portion 130 to prevent oxidation of the raw material M. [

The preheating unit 110 includes a preheating housing 110a in which an inlet is formed to allow the raw material M to enter and an inlet door 110b is opened and closed at the inlet. A vacuum device V may be provided. The air inside the preheating housing 110a is removed by the vacuum apparatus V and the inert gas is introduced into the vacuum chamber to fill the inside of the preheating housing 110a to prevent oxidation of the raw material M have. 3, the inert gas may include a sensible heat recovering gas and a combustible gas. The preheating unit 110 may include a first preliminary tub 111 and a second preliminary tub 112, as shown in FIG. 2, It is to be understood that the present invention is not limited thereto.

The heat exchanger 120 may be divided into a first chamber 121, a second chamber 122 and a third chamber 123 communicating with each other in the traveling direction of the raw material M. [ The heat exchanger 120 includes a first separator 128 opened and closed between the first and second chambers 121 and 122 and a second separator 128 opened and closed between the second and third chambers 122 and 123, And a condenser C installed in each of the first chamber 121, the second chamber 122 and the third chamber 123. The condenser C, which is installed in each of the first chamber 121, the second chamber 122 and the third chamber 123, ).

Here, the reciprocating drive structure of the first separator plate 128 and the second separator plate 129 may be any conventional reciprocating drive system such as a hydraulic cylinder type.

The temperature of the second chamber 122 is kept higher than the temperatures of the first and second chambers 121 and 123 so that the thermal reduction of the raw material M is mainly performed in the second chamber 122 .

The heat exchanger 120 includes a vacuum device V for evacuating the interior of each of the first chamber 121, the second chamber 122 and the third chamber 123 and the second chamber 121, And a gas injector (I) for injecting an inert gas into each of the chambers (123). The air inside the heat exchanger 120 is removed by the vacuum device V and the inert gas is injected into the vacuum space by the gas injector I to fill the space between the heat exchanger 120 and the raw material M Can be prevented from being oxidized.

The cooling unit 130 includes a cooling housing 130a having an outlet for discharging the product P and equipped with an outlet door 130b that is opened and closed at the outlet of the cooling housing 130a and a cooling housing 130a for evacuating the inside of the cooling housing 130a A vacuum apparatus V may be provided. The air inside the cooling unit 130 is removed by the vacuum apparatus V and the inert gas is injected into the vacuum chamber by the gas injector I so that the raw material M Can be prevented from being oxidized. For reference, the inert gas at this time may include a sensible heat recovering gas for recovering sensible heat of the product (P).

A temperature regulator 191 for regulating the temperature and a transfer device 192 for transferring the raw material M are installed in the preheating unit 110, the heat exchanging unit 120, and the cooling unit 130 have. The temperature controller 191 may be a direct heating member (112a in FIG. 2) in the preheater 110, a combustor (124 in FIG. 2) in the heat exchanger 120, And may be a sensible heat recovery gas injector for recovering the sensible heat of the product. In addition, it is a matter of course that any conventional transporting arrangement such as a table roller provided with a driving force can be applied to the transporting device 192.

The waste heat recycling means is configured to recycle the waste heat discharged from the heat reducing means in the heat reducing means so that the sensible heat of the product P in the cooling unit 130 and the heat of the product P in the heat exchanging unit 120 It is possible to maximize the energy efficiency of the entire process, and consequently to lower the production cost, thereby improving the productivity.

In addition, the present invention can continuously heat-reduce the raw material (M) by constituting the continuous heat reducing means for continuously heat-treating the raw material (M), thereby increasing the productivity.

Hereinafter, exemplary embodiments of the present invention will be described in detail. It should be noted that the same reference numerals in the drawings denote the same components in different drawings, even if they are displayed on different drawings. Further, in describing the present invention,

M: raw material P: product
110: preheating part 110a: preheating housing
110b: entrance door 111: first example tropical
112: Example 2 Tropical 120: Heat exchanger
120a: reduction housing 121: first chamber
122: the second room 123: the third room
124: combustor 128: first separator plate
129: second separator plate 130: cooling section
130a: Cooling housing 130b: Exit door
140: pressure regulator 180: gate valve
180a: valve body 181: first blocking plate
182: second blocking plate 191: thermostat
192: Feeder V: Vacuum machine
I: Gas injector C: Condenser
210: return gas transfer line 220: exhaust gas transfer line
230: circulation line

Claims (15)

Continuous heat reduction means for continuously heating raw materials; And
Waste heat recycling means configured to recycle the waste heat discharged from the thermal reduction means by the heat reduction means;
/ RTI >
The method according to claim 1,
Wherein the heat reducing means comprises:
A preheating part for preheating the raw material; A heat source for heating the preheated raw material; And a cooling part for cooling the product made by thermally reducing the raw material, wherein the preheating part, the heat exchanging part, and the cooling part are sequentially arranged successively,
Wherein the waste heat recycling unit is configured to recycle the heat discharged from the heat exchanger or the cooling unit in the preheating unit.
3. The method of claim 2,
The waste heat recycling means
A recovery gas transfer line for transferring sensible heat recovery gas recovered from the sensible heat of the product to the preheating unit;
And a heat recovery unit for recovering the heat generated by the heat recovery unit.
The method of claim 3,
The waste heat recycling means
A flue gas transfer line for transferring the flue gas of the combustor from the heat exchanger to the preheater;
Further comprising: a heat recovery unit for recovering the heat generated by the heat recovery unit.
5. The method of claim 4,
The pre-
A first preheating column to which the recovered gas transfer line and the exhaust gas transfer line are connected to preheat the raw material; And
A second precursor column having a direct heating element to secondarily preheat the precursor;
And a heat recovery unit for recovering the heat generated by the heat recovery unit.
6. The method of claim 5,
Wherein the first preliminary stage includes an agitator for dispersing the sensible heat recovered gas introduced from the recovered gas transfer line and the combusted gas introduced from the exhaust gas transfer line,
And the recovered gas transfer line and the exhaust gas transfer line are connected to the second preliminary column to indirectly heat the raw material.
3. The method of claim 2,
And a gate valve is provided between the preheating section and the heat exchanging section and between the heat exchanging section and the cooling section.
8. The method of claim 7,
Wherein the gate valve comprises:
A valve body disposed between the preheating portion and the heat exchanging portion, and between the heat exchanging portion and the cooling portion; And
A first blocking plate and a second blocking plate provided inside the valve body and being opened and closed as a double blocking structure;
And a heat recovery unit for recovering the heat generated by the heat recovery unit.
9. The method of claim 8,
Wherein the gate valve comprises:
A vacuum device for evacuating the interior; And
A gas injector for injecting an inert gas into the interior;
Further comprising: a heat recovery unit for recovering the heat generated by the heat recovery unit.
3. The method of claim 2,
The pre-
A preheating housing in which an inlet is formed to allow the raw material to enter and an inlet door is opened and closed at the inlet; And
A vacuum device for evacuating the interior of the preheating housing;
And a heat recovery unit for recovering the heat generated by the heat recovery unit.
3. The method of claim 2,
The heat-
A first separating plate which is divided into a first chamber, a second chamber, and a third chamber which communicate with each other in the direction of travel of the raw material and which is opened and closed between the first chamber and the second chamber; A reducing housing equipped with a second separator plate opened and closed; And
A condenser mounted in each of the first chamber, the second chamber, and the third chamber;
And a heat recovery unit for recovering the heat generated by the heat recovery unit.
12. The method of claim 11,
Wherein the temperature of the second chamber is maintained higher than the temperature of the first chamber and the third chamber.
12. The method of claim 11,
The heat-
A vacuum device for evacuating the inside of each of the first chamber, the second chamber, and the third chamber; And
A gas injector injecting an inert gas into each of the first chamber and the third chamber;
Further comprising a heat recovery unit
3. The method of claim 2,
The cooling unit includes:
An outlet is formed to discharge the product, and the outlet is provided with a cooling housing having an outlet door that is opened and closed; And
A vacuum device for evacuating the inside of the cooling housing;
And a heat recovery unit for recovering the heat generated by the heat recovery unit.
15. The method according to any one of claims 2 to 14,
A temperature controller for controlling the temperature and a transfer device for transferring the raw material are installed in the preheating part, the heat exchanging part and the cooling part.

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