A magnesium metal vertical tank reduction furnace

Abstract

The present invention relates to a vertical magnesium reduction furnace, comprising a plurality of furnace chambers arranged along the length of the furnace, with the two ends of the furnace chambers along the furnace width alternately serving as gas inlet ends. An even number of heat accumulators are provided on the furnace roof of each furnace chamber along the furnace width. The heat accumulators are connected to the interior of the furnace chamber, with the heat accumulators near the gas inlet end serving as air inlets and the heat accumulators at the other end serving as flue gas outlets. By arranging the heat accumulators at the furnace roof, the chimney effect is utilized to guide the flue gas out of the heat accumulators at the furnace roof, thereby preventing the flue gas from leaking out of the gap between the furnace roof and the material tank.

Description

Technical Field

[0001] The present invention relates to the technical field of magnesium reduction furnaces, and in particular to a vertical tank reduction furnace for magnesium metal. Background Art

[0002] Industrially, magnesium smelting technology mainly refers to thermal reduction methods represented by the Pidgeon process. The traditional Pidgeon process uses a horizontal tank reduction furnace, but the automation and continuity of horizontal tank production are extremely poor, resulting in low production capacity. In addition, due to the large span of the horizontal tank, the tank is prone to sinking, bending and deformation in a high-temperature environment, shortening the tank's service life. In view of this, in recent years, vertical tank reduction furnaces have begun to be used in production to solve the above-mentioned problems with horizontal tanks. The vertical tank reduction furnace structurally places the reduction tank vertically inside the furnace, and the material addition and discharge are highly automated. It has now replaced the horizontal tank reduction furnace and become the mainstream technology.

[0003] Although the vertical tank reduction furnace can significantly improve the shortcomings of the horizontal tank reduction furnace, it still has significant shortcomings. Since high-temperature gas has the effect of floating upward, the high-temperature flue gas gathers at the top of the reduction furnace. The material tank of the vertical tank reduction furnace is in hard contact with the refractory material on the furnace top. In addition, in order to facilitate the replacement of the material tank in production, the diameter of the material tank needs to be appropriately smaller than the material tank hole reserved for the corresponding furnace top. The gap between the material tank and the furnace top causes a large amount of high-temperature flue gas on the furnace top to overflow, which not only causes the temperature of the furnace top to be abnormally high, but also wastes a lot of energy, and ultimately makes the smelting unit consumption at a high level. Therefore, solving the problem of high-temperature flue gas leakage between the material tank and the furnace top is crucial to the production of magnesium metal. Summary of the Invention

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a vertical magnesium reduction furnace, which arranges a heat storage body at the furnace top and utilizes the chimney effect to lead the flue gas out from the heat storage body at the furnace top, thereby preventing the flue gas from leaking out from the gap between the furnace top and the material tank.

[0005] In order to achieve the above objectives, the main technical solutions adopted by the present invention include:

[0006] A vertical reduction furnace for magnesium metal comprises a plurality of furnace chambers arranged along the length of the furnace, wherein the two ends of the furnace chambers along the width of the furnace serve alternately as gas inlet ends, an even number of heat storage bodies are arranged on the furnace top along the width of the furnace, and the heat storage bodies are connected to the interior of the furnace chamber, the heat storage bodies near the gas inlet end of the furnace chamber serve as air inlet, and the heat storage bodies at the other end serve as flue gas outlet.

[0007] By placing the heat storage body on the furnace top, the chimney effect is used to lead the flue gas out from the heat storage body on the furnace top, thereby preventing the flue gas from leaking out from the gap between the furnace top and the material tank.

[0008] Furthermore, there are four heat storage bodies, two of which are respectively located between the furnace wall and the material tank at both ends of the furnace chamber along the furnace width direction, and the other two heat storage bodies are respectively separated from the heat storage bodies at both ends by two rows of material tanks.

[0009] By specifically setting the number and position of the heat storage bodies, it is ensured that the flue gas flows from one end of the furnace chamber to the other end, and at the same time the pressure in the furnace chamber is balanced.

[0010] Furthermore, each furnace chamber is symmetrically provided with gas burners on the furnace walls at both ends along the furnace width direction, with 3 gas burners at each end. The 3 gas burners are sequentially arranged in the middle and lower parts along the furnace height direction, and the gas burners are used for gas intake.

[0011] By arranging the gas burner in the lower middle part of the furnace chamber, the gas volume in the upper part of the furnace chamber is reduced and the gas volume in the bottom part is increased, thereby increasing the bottom temperature.

[0012] Furthermore, the three gas burners at each end are, from high to low, the first gas burner, the second gas burner and the third gas burner, and the distance between the first gas burner and the second gas burner is greater than the distance between the second gas burner and the third gas burner.

[0013] By setting the spacing between the gas burners, the gas burners at the bottom of the furnace chamber can be made denser, thereby increasing the gas supply.

[0014] Furthermore, when the gas intake of the furnace chamber is switched from one end to the other, the heat storage body serving as the air inlet is switched to the flue gas outlet, and the heat storage body serving as the flue gas outlet is switched to the air inlet.

[0015] By changing the function of the heat storage body while switching the gas inlet end, the heat storage body can be adapted to gas inlet at either end, keeping the flue gas mainstream flowing from one end of the gas inlet end of the furnace chamber to the other end, so that the pressure in the furnace chamber is balanced.

[0016] Furthermore, among the four heat storage bodies, the two heat storage bodies close to the gas inlet end serve as air inlets, and the two heat storage bodies close to the gas outlet end serve as flue gas outlets.

[0017] By evenly distributing the functions of the four heat storage bodies, the flue gas flows evenly and the pressure in the furnace is balanced.

[0018] Furthermore, of the two heat storage bodies serving as air inlets, the heat storage body close to the gas inlet end is the main air inlet, and the other is the auxiliary air inlet; of the two heat storage bodies serving as flue gas outlets, the heat storage body close to the furnace wall is the main flue gas outlet, and the other is the auxiliary flue gas outlet.

[0019] By allocating the functions of each heat storage body, the flue gas mainstream is ensured to flow from one end of the gas inlet of the furnace chamber to the other end, with the longest route, maximizing the utilization of the energy released by the gas combustion. At the same time, it can effectively balance the pressure levels of different parts of the furnace, ensuring that there is a minimum negative pressure in the gap between the material tank and the furnace top, which will neither cause the flue gas to leak out nor consume too much negative pressure, thus saving negative pressure electricity.

[0020] The beneficial effects of the present invention are:

[0021] The magnesium vertical reduction furnace of the present invention places a regenerator at the furnace top, utilizing the chimney effect. The chimney effect, combined with the coordination of different regenerators, ensures that high-temperature flue gas flows out of corresponding regenerators, thereby preventing flue gas from leaking out through the gap between the charging tank and the furnace top. This not only improves the high-temperature environment at the furnace top but also further optimizes the production of the vertical reduction furnace based on this structure, reducing the unit cost of magnesium reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of a current vertical drum reduction furnace along the furnace width direction;

[0023] Figure 2 for Figure 1 Schematic diagram of the cross section along the AA direction;

[0024] Figure 3 This is a schematic structural diagram of a vertical tank reduction furnace for magnesium metal according to the present invention along the furnace width direction;

[0025] Figure 4 for Figure 3 Schematic cross-section along direction BB.

[0026] In the figure: 1. furnace chamber; 2. furnace top; 3. furnace wall; 4. material tank; 5. heat storage body; 6. first gas burner; 7. second gas burner; 8. third gas burner. DETAILED DESCRIPTION

[0027] To better explain the present invention and facilitate understanding, the present invention is described in detail below with reference to the accompanying drawings and through specific embodiments. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0028] Figure 1-Figure 2 The structure of the current vertical drum reduction furnace is shown.

[0029] like Figure 3-Figure 4As shown, an embodiment of the present invention is a vertical pot reduction furnace for magnesium metal, comprising a plurality of furnace chambers 1 arranged along the length of the furnace, wherein the two ends of the furnace chambers 1 along the width of the furnace serve alternately as gas inlet ends, and an even number of heat storage bodies 5 are provided on the furnace top 2 of each furnace chamber 1 along the width of the furnace, wherein the heat storage bodies 5 are connected to the interior of the furnace chamber 1, and the heat storage bodies 5 near the gas inlet end in the furnace chamber 1 serve as air inlet, and the heat storage bodies 5 at the other end serve as flue gas outlet.

[0030] By arranging the heat storage body 5 on the furnace top 2 , the smoke is drawn out from the heat storage body 5 on the furnace top 2 by utilizing the chimney effect, thereby preventing the smoke from leaking out from the gap between the furnace top 2 and the material tank 4 .

[0031] Specifically, there are four heat storage bodies 5, two of which are respectively located between the furnace wall 3 and the material tank 4 at both ends of the furnace chamber 1 along the furnace width direction, and the other two heat storage bodies 5 are respectively separated from the heat storage bodies 5 at both ends by two rows of material tanks 4.

[0032] By specifically setting the number and position of the heat storage bodies 5 , it is ensured that the main flow of flue gas flows from one end to the other end of the furnace chamber 1 , and at the same time the pressure in the furnace chamber 1 is balanced.

[0033] The vertical reduction furnace shown in the embodiment of the present invention has 6 rows of material tanks 4 , and the arrangement of the heat storage body 5 is also applicable to a furnace type with 8 rows of material tanks 4 .

[0034] Specifically, each furnace chamber 1 is symmetrically provided with gas burners on the furnace walls 3 at both ends along the furnace width direction, with three gas burners at each end. The three gas burners are sequentially arranged in the middle and lower parts along the furnace height direction, and the gas burners are used for gas intake.

[0035] By arranging the gas burner at the lower middle part of the furnace chamber 1, the gas amount at the upper part of the furnace chamber 1 is reduced, while the gas amount at the bottom is increased, thereby increasing the bottom temperature.

[0036] Specifically, the three gas burners at each end are, from high to low, the first gas burner 6 , the second gas burner 7 and the third gas burner 8 , and the distance between the first gas burner 6 and the second gas burner 7 is greater than the distance between the second gas burner 7 and the third gas burner 8 .

[0037] By setting the spacing between the gas burners, the gas burners at the bottom of the furnace chamber 1 are made denser, thereby increasing the gas supply.

[0038] In a traditional vertical drum reduction furnace, high-temperature flue gas gathers at the top, and the temperature at the bottom is relatively low, resulting in low reduction efficiency at the bottom. The reduction slag is also easily adhered to the bottom of the material tank 4. By increasing the bottom gas volume and thus increasing the bottom temperature of the furnace chamber 1, it helps to improve the overall temperature uniformity of the furnace chamber 1, especially to increase the working temperature of the material at the bottom of the material tank 4, which not only improves the reduction efficiency, but also reduces the adhesion of the reduction slag to the bottom of the material tank 4.

[0039] Specifically, when the gas intake of the furnace chamber 1 is switched from one end to the other, the heat storage body 5 serving as the air inlet is switched to the flue gas outlet, and the heat storage body 5 serving as the flue gas outlet is switched to the air inlet.

[0040] By changing the function of the heat storage body 5 while switching the gas inlet end, the heat storage body 5 can be adapted to gas inlet at any end, keeping the flue gas mainstream flowing from one end of the gas inlet end of the furnace chamber 1 to the other end, so that the pressure in the furnace chamber 1 is balanced.

[0041] Specifically, among the four heat storage bodies 5, the two heat storage bodies 5 close to the gas inlet end serve as air inlets, and the two heat storage bodies 5 close to the gas outlet end serve as flue gas outlets.

[0042] By evenly distributing the functions of the four heat storage bodies 5 , the flue gas flows evenly and the pressure in the furnace chamber 1 is balanced.

[0043] Specifically, of the two heat storage bodies 5 serving as air inlets, the heat storage body 5 close to the gas inlet end is the main air inlet, and the other is the auxiliary air inlet; of the two heat storage bodies 5 serving as flue gas outlets, the heat storage body 5 close to the furnace wall 3 is the main flue gas outlet, and the other is the auxiliary flue gas outlet.

[0044] By allocating the functions of each heat storage body 5, it is ensured that the main flow of flue gas flows from one end of the gas inlet of the furnace chamber 1 to the other end, with the longest route, and the energy released by the combustion of gas is utilized to the maximum extent. At the same time, it can effectively balance the pressure levels of different parts of the furnace, and ensure that there is a minimum negative pressure in the gap between the material tank 4 and the furnace top 2, which neither causes the flue gas to leak out nor consumes too much negative pressure, thereby saving negative pressure electricity.

[0045] The main air outlet and the main flue gas outlet play the main role of air inflow and flue gas outflow, and the two heat storage bodies 5 in the middle are the auxiliary air inlet and auxiliary flue gas outlet, which are mainly used to balance the internal pressure of the furnace.

[0046] Negative pressure control can be achieved in the furnace through an adaptive algorithm. In actual production, the negative pressure of the heat storage body 5 serving as the auxiliary flue gas outlet is relatively small, and the negative pressure of the main flue gas outlet is the largest. Since the flue gas outflow from the auxiliary flue gas outlet in the middle is small, the stored heat is also very small. Correspondingly, when the flue gas outlet is converted to an air inlet, the flow rate of the heat storage body 5 serving as the auxiliary air inlet also needs to be controlled to a minimum, and the air inflow of the heat storage body 5 serving as the main air inlet is maximized, so as to maximize the utilization of the energy released by the combustion of coal gas and effectively balance the pressure levels of different parts of the furnace. The specific control process can be obtained by those skilled in the art based on the above requirements in combination with the existing algorithm, and the detailed algorithm will not be repeated here.

[0047] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A magnesium metal vertical reduction furnace, comprising a plurality of furnace chambers (1) arranged along the furnace length, wherein both ends of the furnace chambers (1) along the furnace width serve as gas inlet ends alternately, and wherein: Four heat storage bodies (5) are provided on the furnace top (2) of each furnace chamber (1) along the furnace width direction. The heat storage bodies (5) are connected to the interior of the furnace chamber (1). The heat storage bodies (5) near the gas inlet end of the furnace chamber (1) serve as air inlets, and the heat storage bodies (5) at the other end serve as smoke outlets. Two of the heat storage bodies (5) are respectively located between the furnace wall (3) and the material tank (4) at both ends of the furnace chamber (1) along the furnace width direction, and the other two heat storage bodies (5) are respectively separated from the heat storage bodies (5) at both ends by two rows of material tanks (4).

2. The magnesium vertical reduction furnace according to claim 1, characterized in that: Each furnace chamber (1) is symmetrically provided with gas burners on the furnace walls (3) at both ends along the furnace width direction, with three gas burners provided at each end. The three gas burners are sequentially arranged in the middle and lower part along the furnace height direction, and the gas burners are used for gas intake.

3. The magnesium vertical reduction furnace according to claim 2, characterized in that: The three gas burners at each end are arranged from high to low as follows: a first gas burner (6), a second gas burner (7) and a third gas burner (8); the distance between the first gas burner (6) and the second gas burner (7) is greater than the distance between the second gas burner (7) and the third gas burner (8).

4. The magnesium vertical reduction furnace according to claim 1, characterized in that: When the gas inlet of the furnace chamber (1) is switched from one end to the other, the heat storage body (5) serving as the air inlet is switched to the smoke outlet, and the heat storage body (5) serving as the smoke outlet is switched to the air inlet.

5. The magnesium vertical reduction furnace according to claim 1, characterized in that: Among the four heat storage bodies (5), the two heat storage bodies (5) close to the gas inlet end serve as air inlets, and the two heat storage bodies (5) close to the gas outlet end serve as smoke outlets.

6. The magnesium vertical reduction furnace according to claim 5, characterized in that: Of the two heat storage bodies (5) serving as air inlets, the heat storage body (5) close to the gas inlet end is the main air inlet, and the other is the auxiliary air inlet; of the two heat storage bodies (5) serving as smoke outlets, the heat storage body (5) close to the furnace wall (3) is the main smoke outlet, and the other is the auxiliary smoke outlet.

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