CN205262179U - Aluminum smelting stove - Google Patents

Abstract

The utility model discloses an aluminum smelting furnace, which comprises a hearth of the smelting furnace. A furnace mouth is arranged in front of the hearth of the smelting furnace, which is used for proportioning air and gas, and sprays combustible mixed gas formed after the proportioning from the furnace mouth. The combustible mixed gas is burned in the furnace, and the waste gas generated by the combustion of the combustible mixed gas in the furnace enters the exhaust pipe, and is sucked into the chimney by the induced draft fan for discharge. A furnace flame balance combustion energy-saving device is installed between the exhaust pipe and the furnace: The left side wall and the right side wall of the furnace hearth of the melting furnace are provided with secondary air-waste gas inlet and outlet respectively, and the two secondary air-waste gas inlets and outlets are respectively connected with the regenerator. The regenerator includes a closed shell, a closed A regenerator is arranged in the shell, and the two regenerators are selectively communicated with the secondary air blower or the smoke exhaust pipe through the three-way switching valve. It has the characteristics of uniform combustion temperature in the furnace, long service life, energy saving and environmental protection, and high smelting quality.

Description

An aluminum smelting furnace

technical field

The utility model relates to an aluminum smelting furnace.

Background technique

The development of various energy-saving technologies for industrial furnaces has gone through two stages: waste heat not being utilized and waste heat beginning to be utilized, and the same is true for aluminum smelting furnaces. The most primitive aluminum smelting furnace has no waste heat recovery device, and the flue gas at the furnace tail takes away a lot of heat energy, resulting in a large heat loss, and the thermal efficiency of the furnace is below 30%. After later development, the device for recovering waste heat on the flue—the air preheater (or air heat exchanger) is widely used to recover the heat taken away by the flue gas at the tail end of the furnace, which can reduce the temperature of the flue gas and increase the heat entering the furnace. The temperature of the combustion-supporting air has achieved a certain energy-saving effect, but the amount of heat recovered is limited, the service life is short, and maintenance is difficult.

The commonly used regenerative burners arranged in pairs have achieved a substantial energy saving effect. However, for smelting furnaces with 24-hour continuous production, the local temperature of the furnace wall burners is too high, and the interior of the furnace is close to the burners. It also forms a local high temperature, which greatly shortens the service life of the smelting furnace, and some molten aluminum is seriously burned, which increases the maintenance cost.

Utility model content

The technical problem to be solved by the utility model is to provide an aluminum smelting furnace, which has the characteristics of uniform combustion temperature in the furnace, long service life, energy saving and environmental protection, and high smelting quality.

In order to solve the problems of the technologies described above, the technical solution adopted by the utility model is:

An aluminum smelting furnace, comprising a hearth of the smelting furnace, a furnace mouth is arranged in front of the hearth of the smelting furnace, which is used to mix air and gas, and spray the combustible mixed gas formed after the proportioning into the furnace hearth for combustion The burner, the exhaust gas produced by the combustion of combustible mixed gas in the furnace enters the exhaust pipe, and is sucked into the chimney by the induced draft fan to be discharged. There is a furnace flame balanced combustion energy-saving device between the exhaust pipe and the furnace: in the furnace of the melting furnace The left side wall and the right side wall are respectively provided with secondary air-exhaust gas inlet and outlet, and the two secondary air-exhaust gas inlets and outlets are respectively connected with the regenerator. The heat body and the two regenerators are selectively communicated with the secondary air blower or the smoke exhaust pipe through the three-way switching valve.

The utility model is further improved in that:

The furnace flame balanced combustion energy-saving device has a left-right symmetrical structure. The communication port connected with the secondary air-exhaust gas inlet and outlet is located at the rear of the regenerator, and the communication port connected with the three-way switching valve is located in front of the regenerator. The furnace flame burns in a balanced manner. The energy-saving device is a left-right symmetrical structure.

The secondary air blower connected with the two three-way switching valves shares one.

The volume of the regenerator is 1/2 of the furnace volume of the smelting furnace.

The material of the regenerator provided in the closed shell of the regenerator is a honeycomb ceramic regenerator.

The beneficial effects produced by adopting the above-mentioned technical scheme are:

The utility model adjusts the burner so that the combustible mixed gas formed after the ratio of air and gas is incompletely combusted in the furnace, and the gas is excessive. The gas and a small part of normal temperature air are supplied through the burner, and a small part of normal temperature air is mainly used for When the gas is ignited, most of the unignited gas is evenly distributed in the furnace. The secondary air is preheated to achieve the purpose of energy saving. The secondary air meets and burns with the excess gas ejected from the burner. The combustion flame is in the form of a band and surrounds the entire furnace, which solves the problems of different situations in the furnace of aluminum smelting furnaces in the past. The problem of local high temperature. Make the temperature of each part in the furnace uniform, thereby prolonging the service life of the aluminum smelting furnace and effectively controlling the burning loss of the aluminum alloy liquid. The furnace flame balanced combustion energy-saving device has a left-right symmetrical structure. The communication port connected with the secondary air-exhaust gas inlet and outlet is located at the rear of the regenerator, and the communication port connected with the three-way switching valve is located in front of the regenerator. The furnace flame burns in a balanced manner. The energy-saving device is a left-right symmetrical structure. The layout is reasonable, which can effectively save the occupied space, save the construction cost, and shorten the distance of the pipeline, so as to achieve the purpose of energy saving. The utility model has the characteristics of uniform combustion temperature in the furnace, long service life, energy saving and environmental protection, and high smelting quality.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the attached drawings: 1. Furnace of smelting furnace; 2. Burner; 3. Exhaust pipe; 4. Induced fan; 5. Chimney; 6. Secondary air-waste gas inlet and outlet; , heat storage body; 8, three-way switching valve; 9, secondary air blower; 10, gas pipeline; 11, primary blower.

detailed description

The utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

It can be known from the embodiment shown in Figure 1 that this embodiment includes a smelting furnace hearth 1, and a furnace mouth is provided in front of the smelting furnace hearth 1, which is used for proportioning air and gas, and the combustible mixed gas formed after the proportioning The burner 2 is sprayed into the furnace from the furnace mouth for combustion. The exhaust gas produced by the combustion of combustible mixed gas in the furnace enters the exhaust pipe 3 and is sucked into the chimney 5 by the induced draft fan 4 to be discharged. Between the exhaust pipe 3 and the furnace 1 There is an energy-saving device for balanced combustion of the furnace flame: there are secondary air-exhaust gas inlets and outlets 6 on the left and right walls of the melting furnace furnace, and two secondary air-exhaust gas inlets and outlets 6 are respectively connected to the regenerator 7 connected, the heat storage chamber 7 includes a closed shell, and a heat storage body 7-1 is arranged in the closed shell. Pipeline 3 communicates.

The furnace flame balanced combustion energy-saving device has a left-right symmetrical structure. The communication port connected with the secondary air-exhaust gas inlet and outlet 6 is located behind the regenerator 7, and the communication port connected with the three-way switching valve 8 is located in front of the regenerator 7. The energy-saving device for balanced combustion of the furnace flame is a left-right symmetrical structure.

The secondary air blower 9 communicating with the two three-way switching valves 8 shares one.

The volume of the regenerator 7 is 1/2 of the volume of the hearth 1 of the smelting furnace.

The heat storage body 7-1 provided in the closed casing of the heat storage chamber 7 is made of a honeycomb ceramic heat storage body.

Working principle and process:

The utility model adjusts the burner so that the combustible mixed gas formed after the ratio of air and gas is incompletely combusted in the furnace, and the gas is excessive. The gas and a small part of normal temperature air are supplied through the burner, and a small part of normal temperature air is mainly used for When the gas is ignited, most of the unburned gas is evenly distributed in the furnace, and the secondary air blower passes the secondary air through the three-way switching valve 8, passes through the regenerator 7, and enters the smelting from the secondary air-exhaust gas inlet and outlet 6 on the left side wall The hearth 1 of the furnace meets and burns with the excess gas, and the combustion flame is in the form of a belt surrounding the entire hearth, which solves the problem of local high temperature in different situations in the hearth of the aluminum smelting furnace in the past. Make the temperature of each part in the furnace uniform, thereby prolonging the service life of the aluminum smelting furnace and effectively controlling the burning loss of the aluminum alloy liquid. The exhaust gas generated after combustion in the furnace is passed through the secondary air-exhaust gas inlet and outlet 6 on the right side wall, through the regenerator 7, the three-way switching valve 8, the exhaust pipe 3, and is sucked into the chimney 5 by the induced draft fan 4 for discharge. , the high-temperature exhaust gas heats the regenerator 7-1 in the regenerator 7 to store energy; when entering the next cycle, the secondary air blower passes the secondary air through the three-way switching valve 8, passes through the regenerator 7, and passes through the right side wall The secondary air-exhaust gas inlet and outlet 6 enters the hearth 1 of the smelting furnace and burns with excess gas, and the regenerator 7-1 in the regenerator 7 preheats the secondary air entering the hearth 1 of the smelting furnace to achieve the purpose of energy saving .

Claims (5)

1. An aluminum smelting furnace, comprising a smelting furnace hearth (1), the front of the smelting furnace hearth (1) is provided with a furnace mouth, used for proportioning air and gas, and mixing the combustible gas formed after the proportioning The gas is sprayed from the furnace mouth into the burner (2) for burning in the furnace, and the exhaust gas generated by the combustion of combustible mixed gas in the furnace enters the exhaust pipe (3), and is sucked into the chimney (5) by the induced draft fan (4) to be discharged. It is characterized in that: a furnace flame balanced combustion energy-saving device is provided between the exhaust pipe (3) and the furnace (1); secondary air- Exhaust gas inlet and outlet (6), the two secondary air-exhaust gas inlets and outlets (6) communicate with the regenerator (7) respectively, the regenerator (7) includes a closed shell, and the closed shell A regenerator (7-1) is provided in the body, and each of the two regenerators (7) is selectively communicated with the secondary air blower (9) or the exhaust pipe (3) through a three-way switching valve (8). . 2. An aluminum smelting furnace according to claim 1, characterized in that: the furnace flame balanced combustion energy-saving device is a left-right symmetrical structure, and the communication port connected with the secondary air-exhaust gas inlet and outlet (6) is located at the heat storage At the rear of the chamber (7), the communication port communicating with the three-way switching valve (8) is located in front of the regenerator (7), and the furnace flame balanced combustion energy-saving device has a left-right symmetrical structure. 3. The aluminum smelting furnace according to claim 1, characterized in that one secondary air blower (9) communicated with the two three-way switching valves (8) is shared. 4. The aluminum smelting furnace according to claim 1, characterized in that: the volume of the regenerator (7) is 1/2 of the volume of the furnace (1) of the smelting furnace. 5. An aluminum smelting furnace according to claim 4, characterized in that: the regenerator (7-1) provided in the closed shell of the regenerator (7) is made of honeycomb ceramic regenerator .