Side blowing furnace

Abstract

The utility model discloses a side-blown furnace, the side-blown furnace is cylindrical, the cross section of the furnace body of the side-blown furnace is circular or elliptical, the side-blown furnace comprises a furnace body, and a hearth and a molten pool which are fixedly arranged in the furnace body from bottom to top, the molten pool is connected with the furnace body and is suspended and erected above the hearth, and the furnace body is provided with a furnace top and a furnace bottom. The bottom of the hearth is built into an inverted arch shape, the molten pool is defined by a copper water jacket, the copper water jacket is provided with a plurality of air ports in the circumferential direction, the air ports face the center area of the cross section of the furnace body, and a plurality of immersed combustors are arranged between part of the adjacent air ports or above the air ports. By adopting the circular or elliptical side-blowing furnace, utilizing centripetal blast, adjusting the distance between the tuyeres according to the number of the required tuyeres and arranging the immersed burner, dynamics can be enhanced, the blowing effect can be improved, the melt splashing phenomenon can be effectively improved, the effective hearth area can be increased, and the condition that the lower part of the furnace body is underheated and the upper part of the furnace body is overheated can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of nonferrous metal smelting, in particular to a side-blown furnace. Background Art

[0002] Side-blown furnaces are molten pool smelting equipment with advantages such as a sealed, environmentally friendly furnace body, strong charge adaptability, simple material preparation, and high smelting efficiency. With the development of non-ferrous metal smelting technology, side-blown furnaces are playing an increasingly important role in the smelting of various non-ferrous metals such as copper, lead, and zinc, as well as in the recovery of solid waste resources.

[0003] Although the side-blown furnace is an enhanced molten pool smelting method, its processing capacity has been greatly improved compared to traditional blast furnaces, but the processing capacity per unit hearth area has not been significantly improved. The main reasons are: 1. The tuyere spacing of the side-blown furnace is fixed, and the amount of process air blown into the unit hearth area is limited. As the processing capacity increases, the length of the side-blown furnace needs to be extended to ensure sufficient process air. 2. The side-blown furnace blasts air from both sides, causing splashing of the melt. In order to reduce the smoke rate and avoid adhesion and blockage of the flue caused by splashing, the tuyere below the flue is useless, and this area is an ineffective hearth area.

[0004] Furthermore, when side-blown furnaces process valuable metals from solid waste resources for recycling, large amounts of additional fuel are required to achieve the high temperatures required for smelting, as these materials typically have a low calorific value. Side-blown furnaces typically use coal as fuel. Due to its low density, when the mixed material falls from the furnace roof into the molten pool, the low-density coal tends to float on the surface of the melt, where it burns and releases heat. This heat has difficulty transferring to the metal layer beneath the slag, causing the side-blown furnace to experience a cooling-at-the-bottom-and-heat-at-the-top situation. In severe cases, the metal layer can freeze, freezing the furnace, and the furnace roof temperature can reach as high as 1700°C, causing the refractory material to collapse. Utility Model Content

[0005] In view of the above situation, it is necessary to provide a side-blown furnace to address the problems of poor blowing effect and bed capacity of the side-blown furnace in the prior art.

[0006] A side-blown furnace, which is cylindrical and has a circular or elliptical cross-section. It is characterized in that: the side-blown furnace includes a furnace body, and a furnace cylinder and a molten pool fixed from bottom to top in the furnace body, the molten pool is connected to the furnace body and suspended above the furnace cylinder, the bottom of the furnace cylinder is built into an inverted arch shape, the molten pool is surrounded by a copper water jacket, and the copper water jacket is provided with a plurality of air ports along the circumferential direction, the air ports are arranged toward the cross-sectional center area of ​​the furnace body, and a plurality of submerged burners are provided between some adjacent air ports or above the air ports, one end of the plurality of submerged burners is placed outside the furnace body, and the other end of the plurality of submerged burners extends toward the furnace cylinder.

[0007] The utility model adopts a circular or elliptical side-blowing furnace, utilizes centripetal blasting, and has adjustable blast pressure, which can enhance dynamics, improve the blowing effect, and effectively improve the melt splashing phenomenon. The tuyere spacing is adjusted according to the required number of tuyere, and the number of tuyere per unit hearth area is increased, thereby increasing the effective side-blowing furnace area, reducing the actual furnace area, improving the bed capacity, saving furnace body investment and floor space, and arranging an immersion burner so that the heat brought in by the fuel combustion directly contacts the lower melt, and the burning high-temperature gas exchanges heat with the melt in the process of passing through the melt upward, thereby avoiding the situation where the lower part of the furnace body is underheated and the upper part is overheated.

[0008] Furthermore, the tuyere is horizontally lower than the slag level of the molten pool.

[0009] The utility model improves the spraying effect by setting the height of the air outlet.

[0010] Furthermore, the height of the end of the submerged burner outside the furnace body is higher than the height of the end of the submerged burner extending toward the furnace cylinder, and the height of the end of the submerged burner outside the furnace body is consistent with the height of the tuyere or higher than the top surface of the molten pool.

[0011] The utility model provides an immersion burner, and the immersion burner extends from the outside of the furnace body into the furnace body at an inclined angle, so that the heat brought in by the fuel combustion directly contacts the lower melt, and the burning high-temperature gas exchanges heat with the melt in the process of passing through the melt upward, thereby avoiding the situation where the lower part of the furnace body is underheated and the upper part is overheated.

[0012] Furthermore, a reburning zone is formed between the molten pool and the top of the furnace body.

[0013] Furthermore, the volume of the reburning zone is greater than the volume of the furnace.

[0014] Furthermore, the number of the air outlets is 14 to 28, and the air volume of a single air outlet is 1000 Nm 3 / h, the blast pressure of a single tuyere is 0.15MPa to 0.2MPa, and the spacing between adjacent tuyere is 450mm to 600mm.

[0015] Furthermore, the number of the submerged burners is 4. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a cross-sectional view of the first embodiment of the present utility model;

[0017] Figure 2 This is a front view of the first embodiment of the utility model.

[0018] Reference numerals: 1. furnace body; 2. furnace hearth; 3. molten pool; 31. submerged burner; 32. tuyere; 4. reburning zone. DETAILED DESCRIPTION

[0019] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The drawings illustrate embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, the embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are for the purpose of describing specific embodiments only and are not intended to limit this invention. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items. Furthermore, the various embodiments of this invention, the features within the embodiments, and the features between the embodiments may be freely combined, provided there are no obvious conflicts or contradictions.

[0022] Example 1

[0023] like Figure 1 and Figure 2 As shown, a side-blown furnace has a circular cross-section.

[0024] The side-blown furnace includes a furnace body 1, a furnace cylinder 2 and a molten pool 3 fixed from bottom to top in the furnace body, the molten pool 3 is connected to the furnace body 1 and suspended above the furnace cylinder 2, the furnace cylinder 2 is formed into an inverted arch along the bottom of the furnace body 1, and the molten pool 3 is surrounded by a copper water jacket, and the copper water jacket is provided with a plurality of tuyere 32 along the circumferential direction, the tuyere 32 is arranged toward the center of the copper water jacket, and the top surface of the tuyere 32 in the horizontal direction is lower than the slag liquid level in the molten pool 3, and an submerged burner 31 is provided between some adjacent tuyere 32, one end of the submerged burner 31 is exposed to the furnace body 3, and the other end of the submerged burner 31 extends to the furnace cylinder 2, the submerged burner 31 enters the furnace body 3 from the outside of the furnace body 3 and forms an inclined angle along the vertical direction, so that the height of the end of the submerged burner 31 exposed to the furnace body 3 is higher than the height of the end of the submerged burner 31 extending to the furnace cylinder 2, and the height of the end of the submerged burner 31 exposed to the furnace body is lower than the slag liquid level in the molten pool 3.

[0025] A reburning zone 4 is formed between the molten pool 3 and the top of the furnace body 1 , and the volume of the reburning zone 4 is larger than the volume of the furnace cylinder 2 .

[0026] The utility model adopts a circular side-blown furnace, and circulating water is introduced when processing copper concentrate to cool the copper water jacket, thereby ensuring normal production. 28 air vents 32 are provided on both sides of the copper water jacket, 20 of which are in use and 8 are in standby. Process air is centripetally blown into the molten pool 3 from the air vents 32, and the air blast of a single air vent 32 is set to 1000Nm 3 / h, the blast pressure is set to 0.2MPa, the distance between the tuyere 32 is set to 450mm, and the process air volume is set to 20000Nm 3 / h, the percentage of oxygen in the process air volume is set to 80%, and the charge added with the wrapping belt causes the melt to bubble and expand, and the smelting reaction is carried out in the molten pool, thereby achieving enhanced dynamics, improving the blowing effect, and effectively improving the melt splashing phenomenon. By setting the air port 32, a side-blown furnace bed area of ​​12.56㎡ is formed, and the bed capacity is 112t / ㎡·d, which reduces the actual furnace area, saves furnace body investment and land occupation, and sets 4 submerged burners 31, 2 of which are used and 2 are spare. The fuel in the submerged burner 31 is pulverized coal. The consumption is 600kg / h, and the submerged burner 31 extends from the outside of the furnace body 1 to the inside of the furnace body 1 at an inclined angle, so that the heat brought by the fuel combustion directly contacts the lower melt, and the burning high-temperature gas exchanges heat with the melt in the process of passing through the melt upward, thereby avoiding underheating of the lower part of the furnace body and overheating of the upper part. The volume of the reburning zone 4 is larger than that of the furnace cylinder 2, which can reduce the air flow velocity, reduce the smoke rate, and ensure sufficient combustion in the furnace. The pulverized coal consumption of the side-blown furnace is 28t / d, and the copper concentrate feed rate can be processed: 1400t / d.

[0027] When the side-blown furnace is used to process copper solid waste, the number of tuyere 32 is set to 14, of which 7 are in use and 7 are spare. The blast of each tuyere 32 is set to 1000Nm3 / h, the blast pressure is set to 0.15MPa, the distance between the tuyere 32 is set to 600mm, and the process air volume is set to 7000Nm 3 / h, the percentage of oxygen in the process air volume is set to 30%, the number of submerged burners 31 is set to 4, of which 2 are in use and 2 are in standby, the fuel in the submerged burner 31 is natural gas, and the natural gas consumption is set to 600Nm 3 / h, the side-blown furnace bed area formed by setting the tuyere 32 is 5.72㎡, the bed capacity is 49t / ㎡·d, and the natural gas consumption of the side-blown furnace is 1150Nm 3 / h, achieving a copper solid waste processing capacity of 280t / d.

[0028] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0029] The above-described embodiments merely represent implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A side-blown furnace, wherein the side-blown furnace is cylindrical, and the cross-section of the furnace body of the side-blown furnace is circular or elliptical, characterized in that: The side-blown furnace includes a furnace body, and a furnace cylinder and a molten pool fixed from bottom to top in the furnace body, the molten pool is connected to the furnace body and suspended above the furnace cylinder, the bottom of the furnace cylinder is built into an inverted arch shape, the molten pool is surrounded by a copper water jacket, the copper water jacket is provided with a plurality of tuyere along the circumferential direction, the tuyere is arranged toward the cross-sectional center area of ​​the furnace body, a plurality of submerged burners are arranged between some adjacent tuyere or above the tuyere, one end of the plurality of submerged burners is placed outside the furnace body, and the other end of the plurality of submerged burners extends toward the furnace cylinder.

2. The side-blown furnace according to claim 1, characterized in that: The tuyere is below the slag level in the molten pool in the horizontal direction.

3. The side-blown furnace according to claim 1, characterized in that: The height of one end of the submerged burner outside the furnace body is higher than the height of one end of the submerged burner extending toward the furnace cylinder, and the height of one end of the submerged burner outside the furnace body is consistent with the height of the tuyere or higher than the top surface of the molten pool.

4. The side-blown furnace according to claim 1, characterized in that: A reburning zone is formed between the molten pool and the top of the furnace body.

5. The side-blown furnace according to claim 4, characterized in that: The volume of the reburning zone is greater than the volume of the furnace.

6. The side-blown furnace according to claim 1, characterized in that: The number of tuyere: 14 to 28, the air volume of a single tuyere: 1000 Nm 3 / h, blast pressure of a single tuyere: 0.15MPa~0.2MPa, the distance between adjacent tuyere: 450mm~600mm.

7. The side-blown furnace according to claim 1, characterized in that: The number of the submerged burners is 4.

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