Fixed stirring type electric furnace for smelting

Abstract

The utility model relates to the technical field of smelting, in particular to a fixed stirring type electric furnace for smelting. Comprising a rotatably arranged furnace body, a furnace body cover plate arranged at the position of an opening of the furnace body, a stirring shaft fixedly arranged and inserted into the furnace body, a material turning plate arranged on the stirring shaft and used for stirring discrete smelting materials in the furnace body, and a fluid dynamic sealing assembly arranged between the furnace body cover plate and the opening of the furnace body. An electric heating element used for heating smelting materials in the furnace body is arranged on the face, facing the interior of the furnace body, of the furnace body cover plate. The fixed stirring type smelting electric furnace serves as a smelting electric furnace for ironmaking, and on the basis of basically meeting the equipment efficiency performance, the equipment investment cost can be further reduced, and the equipment reliability is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to smelting technical field, concretely relates to a fixed stirring type electric furnace for smelting. BACKGROUND

[0002] The traditional ironmaking mode is to use blast furnace to smelt iron. During the reduction process of blast furnace ironmaking, when iron and oxygen in iron ore are separated, a considerable amount of Si, Mn, C and other elements will also enter molten iron, so the molten iron must be oxidized and refined to remove excess elements and impurities. The refined molten steel also needs to be deoxidized, which complicates the smelting process, produces more pollution gas, and causes unnecessary energy and raw material consumption.

[0003] The recently developed short process hydrogen-based shaft furnace-electric furnace smelting process uses hydrogen-based shaft furnace to smelt iron, using hydrogen and coke oven gas as reducing agent to reduce iron in iron ore particles in the shaft furnace, and then further smelting into steel in electric arc furnace. This short process smelting process can greatly reduce energy consumption and has good environmental protection.

[0004] However, the above-mentioned production line using hydrogen-based shaft furnace-electric furnace still has the disadvantage of large equipment investment. In addition, during the reduction of iron in the hydrogen-based shaft furnace, because the raw materials are in a stacked state in the shaft furnace, the flow of the gas in the furnace is not smooth, greatly reducing the uniformity of the heating of the raw materials and the speed of the reduction reaction, and the reduction reaction time is long and the production efficiency is not high.

[0005] Therefore, our company has developed a reduction electric furnace for smelting, and the related technology involves a patent including a smelting electric furnace (CN220981908U). The smelting electric furnace includes a rotating furnace body, a furnace cover plate arranged at the mouth of the furnace body, a stirring shaft penetrating the furnace cover plate and inserted into the furnace body, a stirring impeller arranged on the stirring shaft for stirring the discrete smelting materials in the furnace body, a first fluid dynamic seal assembly arranged between the furnace cover plate and the mouth of the furnace body, a second fluid dynamic seal assembly arranged between the insertion part of the stirring shaft and the stirring shaft on the furnace cover plate, and an electric heating element arranged on one side of the furnace cover plate facing the inside of the furnace body for heating the smelting materials in the furnace body. The smelting reduction electric furnace using this technical solution can improve the production efficiency of smelting reduction, and the equipment investment is less.

[0006] The stirring device in the above-mentioned smelting electric furnace mainly uses a rotating stirring shaft and a material stirring structure of stirring impeller, which has a relatively complex structure. In some special application occasions of users, it may be necessary to further reduce the equipment investment cost and improve the equipment reliability on the basis of basically meeting the efficiency performance of the equipment. Therefore, it is necessary to improve the above-mentioned smelting electric furnace. CONTENT OF THE UTILITY MODEL

[0007] The utility model discloses a kind of fixed agitating type electric furnaces for smelting, and it is proposed to a kind of fixed agitating type electric furnaces for smelting for the technical improvement of electric furnace (CN220981908U), it is designed to substantially meet the efficiency performance of equipment on the basis, further reduce equipment investment cost, improve equipment reliability.The specific technical solutions are as follows:

[0008] A kind of fixed agitating type electric furnaces for smelting, including rotationally arranged furnace body, furnace body cover plate being arranged at the mouth portion position of the furnace body, fixedly arranged and inserted into the stirring shaft in the furnace body, be arranged on the stirring shaft and be used for stirring the inside discrete type smelting material of the furnace body and be arranged between the furnace body cover plate and the mouth portion of the furnace body and be provided with fluid dynamic sealing assembly, on the one side of the furnace body cover plate towards the inside of the furnace body, it is provided with electric heating element for heating smelting material inside furnace body.

[0009] Preferably, the number of stirring shafts is multiple.

[0010] Preferably, multiple stirring shafts are arranged in a circumferential array around the circumference.

[0011] Preferably, the turnover plate is inclined relative to the internal bottom surface of the furnace body.

[0012] Preferably, multiple turnover plates can be arranged on one stirring shaft in an up-down position.

[0013] In the utility model, the turnover plate corresponding to each stirring shaft is one of the following turnover plates:

[0014] (1) the turnover plate is a left turnover plate for turning smelting material inside the furnace body to the left side in front of the turnover plate;

[0015] (2) the turnover plate is a right turnover plate for turning smelting material inside the furnace body to the right side in front of the turnover plate;

[0016] (3) the turnover plate is a front turnover plate for turning smelting material inside the furnace body forward along the circumference of the furnace body.

[0017] Preferably, the left turnover plate, the front turnover plate and the right turnover plate are sequentially and alternately arranged in a circumferential direction.

[0018] Preferably, the turnover plate and the stirring shaft are made of high-temperature-resistant steel and are integrally connected, and a layer of refractory material is cast on the outer surfaces of the turnover plate and the stirring shaft, and a layer of refractory material is cast on the side of the furnace body cover plate towards the furnace body.

[0019] The utility model discloses a fixed agitating type smelting electric furnace still includes the base, sets up a pair of stand on the base, sets up the crossbeam board on a pair of stand, the furnace body rotation is arranged on the base, the furnace body cover plate is connected in the lower position of crossbeam board, is provided with by the rotary disc of speed reducer drive on the base, the furnace body is installed on with the rotary disc.

[0020] As the preferred scheme of the stirring shaft fixing mode in the utility model, the stirring shaft is fixed on the furnace body cover plate, or the stirring shaft is fixed on the crossbeam plate and passes through the furnace body cover plate to enter the inside of the furnace body, and a sealing structure is arranged between the stirring shaft and the furnace body cover plate.

[0021] Preferably, the sealing structure between the stirring shaft and the furnace body cover plate is a hydrostatic sealing assembly.

[0022] Preferably, the electric heating element is an electric heating silicon molybdenum rod.

[0023] Preferably, the electric heating silicon molybdenum rod is directly inserted into the inside of the furnace body, which can greatly enhance the heating effect of the material.

[0024] Preferably, the cross section of the electric heating silicon molybdenum rod is a water drop-shaped cross section, and the sharp side of the water drop-shaped cross section of the electric heating silicon molybdenum rod is located on the front side of the electric heating silicon molybdenum rod in contact with the material in the furnace body, which can greatly reduce the resistance of the electric heating silicon molybdenum rod in contact with the moving material in the furnace body, thereby reducing the possibility of damage to the electric heating silicon molybdenum rod.

[0025] The fixed agitating type smelting electric furnace in the utility model is a reduction electric furnace for ironmaking.

[0026] The utility model discloses the beneficial effect is:

[0027] First, the fixed agitating type smelting electric furnace of the utility model replaces the rotary stirring shaft in the original smelting electric furnace (CN220981908U) with a fixed stirring shaft, and reasonably sets the number of fixed stirring shafts and the distribution of material turning plates, relies on the rotation of the furnace body to move the material, and realizes the overturning and stirring of the material in the furnace body through the material turning plates. Since the stirring shaft is fixed, a special rotary drive mechanism is not needed, greatly simplifying the structure of the smelting electric furnace, thereby further reducing the equipment investment cost on the basis of basically meeting the equipment efficiency performance, and improving the reliability of the equipment operation.

[0028] Second, the fixed agitating type smelting electric furnace of the utility model, the electric heating element is an electric heating silicon molybdenum rod, which can be directly inserted into the inside of the furnace body, thereby greatly enhancing the heating effect of the material. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a fixed stirring type smelting electric furnace structure schematic diagram of the utility model;

[0030] Figure 2 is in Figure 1 The fluid sealing assembly is provided with a cooling device connected structure schematic diagram;

[0031] Figure 3 is the working principle diagram of the furnace cover plate connecting gas separator and setting annular gas supply chamber and annular gas collection chamber on the furnace cover plate.

[0032] In the figure: 00, fixed stirring type smelting electric furnace, 1, furnace body, 2, furnace cover plate, 3, stirring shaft, 4, turning plate, 5, fluid dynamic sealing assembly, 6, sealing structure, 7, electric heating element, 8, gas separation circulating device, 9, gas separation circulating pipeline, 10, gas separator, 11, gas collection pipeline, 12, gas recycling pipeline, 13, base, 14, stand, 15, cross beam plate, 16, rotary disc, 22, annular water tank, 23, annular ring, 24, cooling device, 25, cooling circulating pipeline, 26, refrigerator or cooling tower, 27, overflow gas negative pressure recovery cover, 28, spiral heat exchange pipe, 35, scraper, 36, refractory material layer, 37, charging port, 38, charging cover, 39, discharge port, 40, discharge door, 41, connecting arm, 42, gas supply pipeline (carbon monoxide supply pipeline), 43, waste heat utilization device, 44, annular gas supply chamber, 45, annular gas collection chamber, 46, vent, 47, gas separation output pipeline (carbon dioxide gas separation output pipeline). DETAILED DESCRIPTION

[0033] The specific embodiments of the utility model are further described below in combination with the drawings and examples. The following examples are only used to more clearly illustrate the technical scheme of the utility model, and cannot limit the protection scope of the utility model.

[0034] As Figures 1 to 3 It is an embodiment of the utility model of a fixed stirring type smelting electric furnace 00, including rotationally arranged furnace body 1, the furnace cover plate 2 of the mouth part position of the furnace body 1, the stirring shaft 3 of fixedly arranged and inserted into the furnace body 1, the turning plate 4 for stirring the discrete type smelting material in the furnace body 1 of the stirring shaft 3, the fluid dynamic sealing assembly 5 is arranged between the furnace cover plate 2 and the mouth part of the furnace body 1, the electric heating element 7 for heating the smelting material in the furnace body 1 is arranged on the one side of the furnace cover plate 2 towards the inside of the furnace body 1.

[0035] Preferably, the number of stirring shafts 3 is multiple.

[0036] In order to ensure the stirring of the smelting material in the furnace body 1, it is necessary to provide a plurality of stirring shafts 3 on the large furnace body 1.

[0037] Preferably, the plurality of stirring shafts 3 are arranged in a circumferential array along the circumference.

[0038] Preferably, a plurality of stirring shafts 3 are arranged in a circumferential array along the circumference.

[0039] Preferably, a plurality of stirring shafts 3 are arranged in a circumferential array along the circumference.

[0040] In the embodiment, the corresponding stirring shaft 3 on each stirring shaft 3 is one of the following stirring plates:

[0041] (1) The stirring plate 4 is a left stirring plate for turning the smelting material in the furnace body 1 to the left front direction of the stirring plate;

[0042] (2) The stirring plate 4 is a right stirring plate for turning the smelting material in the furnace body 1 to the right front direction of the stirring plate;

[0043] (3) The stirring plate 4 is a front stirring plate for turning the smelting material in the furnace body 1 to the front direction of the furnace body 1.

[0044] Preferably, the left stirring plate, the front stirring plate and the right stirring plate are arranged in the circumferential direction in turn.

[0045] Preferably, the stirring plate 4 and the stirring shaft 3 are made of high-temperature-resistant steel and are integrally connected, and a layer of refractory material is poured on the outer surface of the stirring plate 4 and the stirring shaft 3, and a layer of refractory material is poured on the side of the furnace cover plate 2 facing the furnace body 1.

[0046] The fixed stirring type electric furnace 00 of the embodiment further comprises a base 13, a pair of columns 14 arranged on the base 13, a cross beam plate 15 arranged on the pair of columns 14, the furnace body 1 is rotatably arranged on the base 13, and the furnace cover plate 2 is connected below the cross beam plate 15; a rotary disc 16 driven by a speed reducer is arranged on the base 13, and the furnace body 1 is installed on the rotary disc 16.

[0047] As a preferred scheme of the stirring shaft fixing method in the embodiment, the stirring shaft 3 is fixed on the furnace cover plate 2; or the stirring shaft 3 is fixed on the cross beam plate 15 and passes through the furnace cover plate 2 into the furnace body 1, and a sealing structure 6 is arranged between the stirring shaft 3 and the furnace cover plate 2.

[0048] Preferably, the sealing structure between the stirring shaft 3 and the furnace cover plate 2 is a hydrostatic sealing assembly.

[0049] Preferably, the second hydrodynamic sealing assembly in the original smelting electric furnace (CN220981908U) can be converted into the hydrostatic sealing assembly in the present embodiment.

[0050] Preferably, the electric heating element 7 is an electric heating silicon molybdenum rod.

[0051] Preferably, the electric heating silicon molybdenum rod is directly inserted into the inside of the furnace body 1, which can greatly enhance the effect of material heating.

[0052] Preferably, the cross section of the electric heating silicon molybdenum rod is a water drop-shaped cross section, and the sharp side of the water drop-shaped cross section of the electric heating silicon molybdenum rod is located on the front side of the electric heating silicon molybdenum rod in contact with the material inside the furnace body, which can greatly reduce the resistance of the electric heating silicon molybdenum rod in contact with the moving material inside the furnace body, thereby reducing the possibility of damage to the electric heating silicon molybdenum rod.

[0053] In the present embodiment, the fixed stirring smelting electric furnace 00 is a smelting electric furnace for ironmaking.

[0054] In the present embodiment, the smelting electric furnace is also provided with a gas separation and circulation device 8 for treating the gas in the furnace body 1, which includes a gas separation and circulation pipeline 9 connected to the inside of the furnace body 1 at both ends, and a gas separator 10 provided on the gas separation and circulation pipeline 9.

[0055] Preferably, the two ends of the gas separation and circulation pipeline 9 pass through the furnace cover plate 2 and enter the inside of the furnace body 1 to communicate with the inside of the furnace body 1.

[0056] In the present embodiment, the gas in the furnace body 1 includes a first gas for participating in the smelting reaction and a second gas as smelting waste gas, the gas separation and circulation pipeline 9 includes a gas collection pipeline 10 and a gas recycling pipeline 12, the inlet of the gas collection pipeline 11 is connected to the inside of the furnace body 1, the outlet of the gas collection pipeline 11 is connected to the inlet of the gas separator 10, the gas separator 10 is provided with a first gas separation port and a second gas separation port, the first gas separation port of the gas separator 10 is connected to the inlet of the gas recycling pipeline 12, and the outlet of the gas recycling pipeline 12 is connected to the inside of the furnace body 1.

[0057] In the present embodiment, the furnace cover plate 2 is directly connected to the cross beam plate 15, or the furnace cover plate 2 is indirectly connected to the cross beam plate 15 through a plurality of connecting arms 41.

[0058] Preferably, the furnace body 1 is a vertical furnace body, which is horizontally arranged or is arranged to be inclined relative to the horizontal direction.

[0059] When the vertical furnace body is arranged to be inclined by 15-35°, the uniform stirring of the smelting material in the furnace body 1 can be better achieved, and the stirring efficiency is improved.

[0060] Preferably, when the stirring shaft 3 is connected to the cross beam plate in a manner of penetrating the furnace cover plate 2, a stirring shaft mounting hole is arranged on the furnace cover plate 2, the stirring shaft 3 penetrates the stirring shaft mounting hole and enters the furnace body 1, and a sealing structure 6 of the hydrostatic sealing assembly is arranged at a position between the stirring shaft mounting hole and the stirring shaft 3.

[0061] As a preferred scheme of the hydrodynamic sealing assembly in the embodiment, the hydrodynamic sealing assembly 5 comprises an annular water tank 22 arranged on the furnace cover plate 2, an annular ring 23 of the furnace body 1 is inserted into the annular water tank 22, so that a water seal is formed between the furnace cover plate 2 and the furnace body 1, and a cooling device 24 is arranged on the annular water tank 22.

[0062] In the embodiment, the cooling device 24 comprises a cooling circulation pipeline 25 connected to the annular water tank 22, and the cooling circulation pipeline 25 is connected to a refrigerating device or a cooling tower 26.

[0063] Preferably, an overflow gas negative pressure recovery cover 27 is arranged on the periphery of the hydrodynamic sealing assembly 5.

[0064] The overflow gas negative pressure recovery cover 27 is connected to a negative pressure pipeline, so as to form a negative pressure in the overflow gas negative pressure recovery cover 27 and prevent possible overflow of smelting gas.

[0065] In order to further improve the cooling speed of water in the annular water tank 22, a spiral heat exchange pipe 28 is arranged in the annular water tank 22, and the spiral heat exchange pipe 28 is connected to the cooling circulation pipeline 25.

[0066] In the embodiment, two pairs of the cooling circulation pipelines 25 are arranged, one pair of the cooling circulation pipelines 25 is connected to the annular water tank 22 in correspondence, and the other pair of the cooling circulation pipelines 25 is connected to two ports of the spiral heat exchange pipe 28 in correspondence.

[0067] Preferably, a scraper 35 for preventing metallurgical material from adhering to the furnace body 1 is further arranged in the furnace body 1, a lower edge of the scraper 35 is close to a bottom of the furnace body 1, a side edge of the scraper 35 is close to an inner side wall of the furnace body 1, and an upper part of the scraper 35 is connected to the furnace cover plate 2.

[0068] As an application of the embodiment, the discrete smelting material is granular iron ore and discrete coke or coal, the first gas is carbon monoxide, the second gas is carbon dioxide, and the gas separator is a gas separator for separating carbon monoxide from the gas in the furnace body.

[0069] Preferably, the furnace body 1 comprises a shell made of high-temperature-resistant steel and a layer of refractory material 36 cast on the inner wall of the shell.

[0070] Preferably, the scraper 35 comprises a scraper body made of high-temperature-resistant steel and a layer of refractory material cast on the outer surface of the scraper body.

[0071] Preferably, the scraper 35 is integrally connected with the furnace body cover plate 2.

[0072] In the embodiment, the furnace body cover plate 2 is provided with a charging port 37, and the charging port 37 is provided with a charging cover 38; the furnace body 1 is provided with a discharging port 39, and the discharging port 39 is provided with a discharging door 40.

[0073] Preferably, a gas circulating pump is arranged on the gas separation circulating pipeline 9 of the gas separator 10.

[0074] Preferably, a gas cooling device is arranged on the gas separation circulating pipeline 9 of the gas separator 10.

[0075] Preferably, the furnace body cover plate 2 is provided with a first gas supply pipeline for supplementing the first gas in the furnace body 1.

[0076] Preferably, the furnace body cover plate 2 is provided with a pressure measuring pipe, and the pressure measuring pipe is provided with a pressure transmitter for detecting the gas pressure in the furnace body 1.

[0077] Preferably, the fluid dynamic sealing assembly 5 and the fluid static sealing assembly as the sealing structure 6 are respectively provided with a fluid liquid level sensor and a liquid supplementing pipe.

[0078] It should be noted that the electric furnace for smelting in the embodiment can be used for smelting other special metals in addition to being used as a direct reduction furnace for smelting iron ore, so as to reduce special metals such as nickel and titanium from special ore.

[0079] The above only describes preferred embodiments of the present application, and it should be noted that those skilled in the art can make some improvements and refinements without departing from the technical principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A fixed agitated electric furnace for smelting, characterized in that, The application relates to a fixed-stirring type electric furnace for smelting, which comprises a rotating furnace body, a furnace cover plate arranged at the opening position of the furnace body, a stirring shaft fixedly arranged and inserted into the furnace body, a turnover plate for stirring discrete smelting materials in the furnace body and arranged obliquely relative to the inner bottom surface of the furnace body, a fluid dynamic sealing assembly arranged between the furnace cover plate and the opening of the furnace body, and an electric heating element arranged on the side of the furnace cover plate facing the interior of the furnace body and used for heating smelting materials in the furnace body; wherein the turnover plate is one of a left turnover plate, a right turnover plate and a front turnover plate, the left turnover plate is used for overturning smelting materials in the furnace body to the left side in front of the turnover plate, the right turnover plate is used for overturning smelting materials in the furnace body to the right side in front of the turnover plate, and the front turnover plate is used for overturning smelting materials in the furnace body to the front along the circumference of the furnace body.

2. An electric smelting furnace with stationary stirrers according to claim 1, characterized in that The number of stirring shafts is multiple.

3. An electric smelting furnace with stationary stirrers according to claim 2, characterized in that The multiple stirring shafts are arranged in a circumferential array.

4. An electric smelting furnace with stationary stirrers according to claim 3, characterized in that The electric heating element is an electric heating silicon molybdenum rod which is directly inserted into the interior of the furnace body; the cross section of the electric heating silicon molybdenum rod is in the shape of a water drop, and the tip side of the water drop-shaped cross section of the electric heating silicon molybdenum rod is located at the front side of the electric heating silicon molybdenum rod in contact with the materials in the furnace body.

5. An electric smelting furnace with stationary stirrers according to claim 4, characterized in that The left turnover plate, the front turnover plate and the right turnover plate are alternately arranged in the circumferential direction.

6. The fixed agitated electric furnace for melting according to claim 1, wherein The turnover plate and the stirring shaft are integrally connected and made of high-temperature-resistant steel, and a layer of refractory material is cast on the outer surface of the turnover plate and the stirring shaft; and a layer of refractory material is cast on the side of the furnace cover plate facing the furnace body.

7. A fixed agitated electric furnace for melting according to claim 1, characterized in that, The application further comprises a base, a pair of vertical columns arranged on the base, a cross beam plate arranged on the pair of vertical columns, the furnace body is rotatably arranged on the base, and the furnace cover plate is connected below the cross beam plate; a rotating disc driven by a speed reducer is arranged on the base, and the furnace body is mounted on the rotating disc.

8. An electric smelting furnace with stationary stirrers according to claim 7, characterized in that The stirring shaft is fixed on the furnace cover plate or fixed on the cross beam plate and inserted into the interior of the furnace body through the furnace cover plate, and a sealing structure is arranged between the stirring shaft and the furnace cover plate.

9. An electric smelting furnace with stationary stirrers according to claim 8, characterized in that The sealing structure between the stirring shaft and the furnace cover plate is a fluid static sealing assembly.

10. The fixed agitated electric furnace for melting according to claim 1, wherein The fixed-stirring type electric furnace for smelting is a reduction electric furnace for smelting iron.

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