Gas smelting furnace for smelting aluminum

Abstract

The utility model relates to a gas smelting furnace for smelting aluminum in the technical field of aluminum smelting equipment, a smelting furnace body comprises an aluminum smelting reverberatory furnace and two heat accumulating type combustors, a temperature sensor is arranged on the aluminum smelting reverberatory furnace, and each heat accumulating type combustor comprises a combustion head and a heat accumulator. Each combustion head is provided with three flame nozzles and an ignition nozzle, one heat accumulator is connected with an air blower, the other heat accumulator is connected with an induced draft fan, and a controller is arranged outside the smelting furnace body and can control the two combustion heads to ignite or extinguish in turn and the air blower and the induced draft fan to blow air or induce air in turn. The fuel gas supply pipeline comprises a fuel gas main pipe and two downstream fuel gas branch pipes which are correspondingly connected to the three burners through three gas distribution valves respectively, and the fuel gas main pipe is further connected with a fuel gas branch pipe which is correspondingly connected to the two ignition burners through two gas distribution valves. The gas smelting furnace is more flexible in adjustability, the gas consumption of molten aluminum per ton is reduced, and the gas smelting furnace can better adapt to smelting of small-batch aluminum below 15t.

Description

Technical Field

[0001] The utility model belongs to the technical field of aluminum smelting equipment, and in particular relates to a gas-fired smelting furnace for smelting aluminum. Background Art

[0002] Aluminum ingot casting involves melting aluminum ore or crushed recycled aluminum in a smelting furnace into molten aluminum. The molten aluminum is then evenly distributed and poured into the casting mold of the ingot casting machine. After cooling and shaping, the ingots are removed from the mold. Currently, existing smelting furnaces are mostly equipped with single-nozzle direct-injection regenerative burners, resulting in large single-furnace outputs, typically exceeding 30 tons. These large furnaces are less suitable for small-batch aluminum smelting, typically under 15 tons per furnace, using crushed recycled aluminum as the raw material. This inflexibility and high gas consumption per ton are inherently unsuitable. The burner gas valve assembly and associated control system used in existing smelting furnaces lack the flexibility to adjust for small single-furnace batches using crushed recycled aluminum as the raw material, making it difficult to reduce gas consumption per ton of aluminum melted, making them incompatible with modern industrial energy-saving and consumption-reduction production practices. Therefore, a new gas-fired smelting furnace for aluminum smelting is urgently needed. Utility Model Content

[0003] In view of the above situation, the utility model provides a gas-fired smelting furnace for smelting aluminum, which can better adapt to small-batch aluminum smelting production below 15t.

[0004] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0005] A gas-fired smelting furnace for smelting aluminum comprises a smelting furnace body and a gas supply pipeline for providing gas to the smelting furnace body. The smelting furnace body comprises an aluminum-melting reverberatory furnace and two regenerative burners mounted on the right furnace wall thereof. The aluminum-melting reverberatory furnace is provided with an aluminum material inlet on the front side and an aluminum liquid outlet on the rear side. The aluminum-melting reverberatory furnace is provided with a plurality of temperature sensors.

[0006] The two regenerative burners each include a combustion head and a regenerative body connected thereto. Three flame burners and one ignition burner are installed on each of the combustion heads. A combustion-supporting gas port corresponding to the regenerative body below the two combustion heads is provided below the two combustion heads. The air inlet and outlet of one of the regenerative bodies is connected to a blower, and the air inlet and outlet of the other regenerative body is connected to an induced draft fan.

[0007] A controller is provided on the outside of the smelting furnace body, which can control the two burners to ignite or extinguish in turn, and the blower and induced draft fan to blow or induce air alternately accordingly.

[0008] The gas supply pipeline includes a gas main pipe connected to an external gas source, and two gas branch pipes connected downstream of the gas main pipe for supplying gas to two combustion heads. The gas main pipe is equipped with a filter, a main pressure-stabilizing valve, an electromagnetic gate valve and a precision flow meter. The two gas branch pipes are respectively connected to the three flame burners through three-way gas distribution valves. The gas main pipe is also connected to a gas branch pipe for supplying gas to the two combustion heads. The gas branch pipe is connected to the ignition burners of the two combustion heads through two-way pressure-stabilizing valves and a gas distribution valve.

[0009] Preferably, each of the gas distribution valves and the gas distribution valve is an electromagnetic ball valve, and each electromagnetic ball valve and electromagnetic gate valve is electrically connected to the controller. By controlling the coordination between the gas distribution valve and the ignition burner and the gas distribution valve and the air jet burner, the two combustion heads can be rotated to burn.

[0010] Furthermore, the aluminum material inlet of the aluminum melting reverberatory furnace is provided with a switchable feeding furnace door, and the aluminum liquid outlet is provided with a switchable drain plug.

[0011] Furthermore, a temperature sensor is respectively provided at the front and rear parts of the left furnace wall of the aluminum melting reverberatory furnace, and a temperature sensor is provided at the middle part of the right furnace wall of the aluminum melting reverberatory furnace. All three temperature sensors are thermocouple sensors.

[0012] Furthermore, the interiors of the two heat storage bodies are filled with heat storage fillers, and a switchable maintenance door is provided on the right side wall of the heat storage body.

[0013] Furthermore, the blower and the induced draft fan are respectively connected to the air inlet and outlet of the two heat storage bodies through air ducts, and the top of the two air ducts is connected to an exhaust pipe externally connected to the exhaust gas treatment system.

[0014] The present invention also includes other components that enable it to be used normally, which are all conventional means in the field. In addition, the devices or components not limited in the present invention, such as: heat storage body, burner head, gas source, electromagnetic gate valve, electromagnetic ball valve, blower, induced draft fan, flame burner and ignition burner, as well as controller and control system settings, all adopt the existing technology in the field.

[0015] The beneficial effects of the utility model are as follows:

[0016] The utility model provides a gas-fired smelting furnace for smelting aluminum. The furnace type is specially designed for smelting niche alloys below 15t. With a special burner arrangement and a special gas valve group design, the burner adopts a three-in-one combined burner instead of a single direct injection burner. The gas valve group can cooperate with the control system to realize advance control of the fuel gas and the combustion-supporting gas, so as to achieve linear regulation of the air-fuel ratio of different raw materials in different furnaces, making the adjustability of the gas-fired smelting furnace more flexible, significantly reducing the gas consumption per ton of aluminum melting, and greatly reducing the burnout rate of crushed recycled aluminum raw materials. It can better cope with small-batch crushed recycled aluminum smelting, and is more in line with the production concept of energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the top view of the gas smelting furnace in the embodiment.

[0018] Figure 2 for Figure 1 Schematic diagram of the gas supply pipeline connection of the gas smelting furnace. DETAILED DESCRIPTION

[0019] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments.

[0020] It should be noted that the terms "up", "down", "front", "back", "left", "right", "inside", "outside", etc. indicating directions or positional relationships are based on the accompanying drawings and are only for the convenience of description.

[0021] Example

[0022] like Figure 1 As shown, a gas-fired smelting furnace for smelting aluminum includes a smelting furnace body and a gas supply pipeline for providing gas to the smelting furnace body. The smelting furnace body includes an aluminum-melting reverberatory furnace 1 and two regenerative burners installed on the right furnace wall thereof. The aluminum-melting reverberatory furnace is provided with an aluminum material inlet 2 on the front side and an aluminum liquid outlet 3 on the rear side. The aluminum material inlet of the aluminum-melting reverberatory furnace is provided with a switchable feeding furnace door 4, and the aluminum liquid outlet is provided with a switchable drainage plug.

[0023] Two temperature sensors 5 are provided at the front and rear parts of the left furnace wall of the aluminum melting reverberatory furnace, and one temperature sensor is provided at the middle part of the right furnace wall of the aluminum melting reverberatory furnace. All three temperature sensors are thermocouple sensors.

[0024] The two regenerative burners each include a combustion head 6 and a regenerative body 7 connected thereto. Both regenerative bodies are filled with regenerative filler, and a switchable maintenance door 8 is provided on the right side wall of the regenerative body. Each combustion head is equipped with three flame burners 9 and an ignition burner 10. Below each of the two combustion heads is a combustion-supporting gas port corresponding to the regenerative body below it. The air inlet and outlet of one regenerative body is connected to a blower 11, and the air inlet and outlet of the other regenerative body is connected to an induced draft fan 12. The combustion heads and regenerative bodies are both prior art, and their specific configurations will not be described in detail here.

[0025] A controller 13 is located outside the smelting furnace body to control the two burners to alternately ignite or extinguish, and the blower and induced draft fan to alternately blow or induce air. The controller and its internal control system settings are all prior art and will not be described in detail here.

[0026] When one of the combustion heads connected to the heat storage body on the blower side ignites and burns, the other combustion head connected to the heat storage body on the induced draft fan side is extinguished. At this time, the blower blows air, and the induced draft fan draws air, and at the same time, the heat storage filler in the heat storage body on the induced draft fan side is heated to realize the recovery and storage of exhaust preheating; conversely, when the combustion head connected to the heat storage body on the induced draft fan side ignites and burns, the other combustion head connected to the heat storage body on the blower side is extinguished. At this time, the induced draft fan blows air, the blower draws air, and at the same time, the heat storage body on the blower side is heated.

[0027] This alternating combustion mode alternates every 45 to 60 seconds. The blower and induced draft fan are each connected to the corresponding air inlet and outlet ports of the two heat storage bodies via air ducts 14. Both air ducts are connected above exhaust ducts 15. Both exhaust ducts are externally connected to an exhaust gas treatment system (not shown) that purifies the exhaust gas from the smelting furnace before exhaust. This exhaust gas treatment system is conventional, and its specific configuration is not detailed here.

[0028] like Figure 2 As shown, the gas supply pipeline includes a gas main 16 connected to an external gas source (not shown in the figure), and two gas branch pipes connected downstream of the gas main for supplying gas to two burners. A manual ball valve 17, a filter 18, a main pressure regulating valve 19, a relief valve 20, a pressure sensor 21, a low-pressure switch 22, a high-pressure switch 23, an electromagnetic gate valve 24, an electric butterfly valve 25 and a precision flow meter 26 are installed on the gas main in sequence. The two gas branch pipes are respectively connected to the three flame burners through the regulating ball valve 27, the pressure sensor and the three-way gas distribution valve 28. The gas main is also connected to a gas branch pipe for supplying gas to the two burners. The gas branch pipe is connected to the ignition burners of the two burners through the two-way pressure regulating valve 29, the pressure sensor, the precision regulating valve 30 and the gas distribution valve 31. The gas source belongs to the prior art and the specific settings are not repeated here.

[0029] Each of the gas distribution valves and gas distribution valves is an electromagnetic ball valve, and each electromagnetic ball valve and electromagnetic gate valve is electrically connected to a controller. By controlling the coordination and interlocking control of the gas distribution valve and the ignition burner, as well as the gas distribution valve and the air jet burner, alternating combustion of the two combustion heads can be achieved.

[0030] The technical solution of the present invention is not limited to the above-mentioned specific embodiments. Without departing from the scope and spirit of the described embodiments, many modifications and changes are obvious to ordinary technicians in this technical field. Any technical deformation made within the spirit and principles of the present invention falls within the scope of protection of the present invention.

Claims

1. A gas-fired smelting furnace for smelting aluminum, comprising a smelting furnace body and a gas supply pipeline for supplying gas to the smelting furnace body, characterized in that: The smelting furnace body includes an aluminum melting reverberatory furnace and two regenerative burners installed on the right side of the furnace wall. The aluminum melting reverberatory furnace is provided with an aluminum material inlet on the front side and an aluminum liquid outlet on the rear side. The aluminum melting reverberatory furnace is provided with a plurality of temperature sensors. The two regenerative burners each include a combustion head and a heat storage body connected thereto. Three flame burners and one ignition burner are installed on each of the combustion heads. A combustion-supporting gas port corresponding to the heat storage body below the two combustion heads is provided below each of the two combustion heads. A blower is connected to the air inlet and outlet of one of the heat storage bodies, and an induced draft fan is connected to the air inlet and outlet of the other heat storage body. A controller is provided on the outside of the smelting furnace body, which can control the two combustion heads to ignite or extinguish in turn, and the blower and induced draft fan correspondingly blow or induce air alternately.

2. A gas-fired smelting furnace for smelting aluminum according to claim 1, characterized in that: The gas supply pipeline includes a gas main pipe connected to an external gas source, and two gas branch pipes connected downstream of the gas main pipe for supplying gas to two combustion heads. The gas main pipe is equipped with a filter, a main pressure-stabilizing valve, an electromagnetic gate valve and a precision flow meter. The two gas branch pipes are respectively connected to the three flame burners through three-way gas distribution valves. The gas main pipe is also connected to a gas branch pipe for supplying gas to the two combustion heads. The gas branch pipe is connected to the ignition burners of the two combustion heads through two-way pressure-stabilizing valves and gas distribution valves. Each of the gas distribution valves and gas distribution valves is an electromagnetic ball valve, and each electromagnetic ball valve and electromagnetic gate valve is electrically connected to the controller.

3. The gas-fired smelting furnace for smelting aluminum according to claim 1, characterized in that: The aluminum material inlet of the aluminum melting reverberatory furnace is equipped with a switchable feeding furnace door, and the aluminum liquid outlet is equipped with a switchable drainage plug.

4. The gas-fired smelting furnace for smelting aluminum according to claim 1, characterized in that: A temperature sensor is respectively provided at the front and rear of the left furnace wall of the aluminum melting reverberatory furnace, and a temperature sensor is provided at the middle of the right furnace wall of the aluminum melting reverberatory furnace. All three temperature sensors are thermocouple sensors.

5. The gas-fired smelting furnace for smelting aluminum according to claim 1, characterized in that: The interiors of the two heat storage bodies are filled with heat storage fillers, and a switchable maintenance door is provided on the right side wall of the heat storage body.

6. The gas-fired smelting furnace for smelting aluminum according to claim 1, characterized in that: The blower and the induced draft fan are respectively connected to the air inlet and outlet of the two heat storage bodies through air delivery pipes, and the tops of the two air delivery pipes are connected to exhaust pipes externally connected to the exhaust gas treatment system.

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