CN219347373U - High-efficient aluminum smelting furnace flue gas forced air cooling heat sink - Google Patents

Abstract

The utility model relates to a flue gas air-cooling device of a high-efficiency aluminum smelting furnace, and belongs to the field of smelting furnace equipment. The device comprises a thermal resistance temperature sensor, a gear motor, a primary cooler, a secondary cooler, a screw conveyor, a discharger, an ash collecting box, a swing chain ash removing module, a variable frequency induced draft fan, a bag dust remover, a V-shaped back-off cover plate, a cooling module, a cooling calandria, a waist circular pore plate and an axial flow fan. The structural design of cigarette way in this device can be effectively to gathering and separation of big granule dust in the flue gas, reduces the excessive mill of big granule dust to filter bag filter cloth fibrous, and then prolongs filter bag life, promotes clean system's economic nature. The device saves the air quantity which is increased by the filtration of the dust remover caused by the fact that the natural air of the atmosphere with the mass of 20-35% of the flue gas is gathered into the flue, reduces the volume of the purifying device, further reduces the energy consumption of the system and saves the construction materials.

Description

High-efficient aluminum smelting furnace flue gas forced air cooling heat sink

Technical Field

The utility model belongs to the field of smelting furnace equipment, and particularly relates to a flue gas air cooling device of a high-efficiency aluminum smelting furnace.

Background

When the aluminum smelting furnace works, a large amount of flue gas is discharged from the smelting furnace, the temperature of the flue gas changes periodically, and the temperature reaches 250 ℃ at high temperature. The normal tolerance temperature of a filter bag of the common polyester needled felt of the bag-type dust collector is 120 ℃, and the instantaneous tolerance temperature is 130 ℃, so that the flue gas at the temperature cannot be filtered directly through the polyester needled felt bag-type dust collector.

At present, the common method for treating the flue gas of the aluminum smelting furnace comprises the following steps: the side wall of an inlet flue of the bag-type dust collector is communicated with an adjustable air inlet wild air valve connected with the atmosphere; according to the temperature change of the flue gas of the aluminum smelting furnace, the opening of a wild air valve is adjusted, and natural air of the flue gas and the atmosphere is mixed, so that the purpose of cooling is achieved, and the temperature of the flue gas is reduced to below 120 ℃ and then enters a bag-type dust collector for filtering.

The above method has three disadvantages:

1. the length of the inlet flue of the dust remover is limited, and the flue gas and the natural air of the atmosphere cannot be fully mixed in the pipeline; when the outdoor environment is high in humidity, the mixed smoke is easily caused to have too high water quantity in a local area, so that the filter bag of the dust remover is affected with damp. The filter bag contacts dust to form hardening after being wetted, the filter function is lost, and the service life is greatly shortened. The filter bag is used as a core component of the bag-type dust collector, and the cost of the filter bag is a large part of that of the bag-type dust collector, so that the economy of a purification system is extremely unfavorable.

2. Large particle dust carried in the flue gas impacts the filter bag and drills into gaps among fibers of the filter cloth; because the mass of the filter cloth and the mass of the large particle dust are different, the influence of inertia is also different. Under the action of pulse blowing of the bag-type dust collector, the high-speed compressed air flow impacts the filter bag, so that the bag-type filter cloth is severely vibrated. And severe relative movement is generated between the filter cloth and large-particle dust, and the large-particle dust is polished to scratch the filter cloth fibers, so that the service life of the filter bag is shortened, and the economical efficiency of a purification system is reduced.

3. Because the inlet flue of the dust remover is connected with the wild air valve, the natural air of the atmosphere, which is about 20-35% of the flue gas mass, is directly led into the flue, the filtering air quantity of the dust remover is increased, the equipment body quantity is increased, the energy consumption is increased, and the operation cost of a purification system is further increased.

Disclosure of Invention

The utility model provides a smoke air-cooling device for a high-efficiency aluminum smelting furnace, which comprises a thermal resistance temperature sensor, a speed reducing motor, a primary cooler, a secondary cooler, a screw conveyor, a discharger, an ash collecting box, a swing chain ash removing module, a variable-frequency induced draft fan, a cloth bag dust remover, a V-shaped back-off cover plate, a cooling module, a cooling calandria, a waist circular pore plate and an axial flow fan.

The inlet flue of the cooler is provided with a flue stop valve and a thermal resistance temperature sensor, the inlet flue of the cooler is connected with a primary cooler, the primary cooler comprises a primary cooler a1 and a primary cooler a2, both the primary cooler and a secondary cooler are provided with a cooling module and a swing chain ash removal module, both the primary cooler and the secondary cooler are provided with an air cooling air inlet flue, an air cooling air outlet flue, a circulating air pipeline and an axial flow fan, the air cooling air outlet flue is provided with an air outlet air valve, the circulating air pipeline is provided with an air inlet air valve and an air circulation adjustable opening air valve, the primary cooler is also provided with a V-shaped back-off cover plate, both the primary cooler and the secondary cooler are provided with screw conveyors, the screw conveyors are connected with an unloading device, the unloading device is connected with an ash collecting box, the primary cooler is connected with the secondary cooler through a flue gas collecting flue after primary cooling treatment, and the secondary cooler is connected with a bag-type dust collector through a flue gas collecting channel after secondary cooling treatment; and a thermal resistance temperature sensor is arranged between the secondary cooler and the bag-type dust remover, and the bag-type dust remover is connected with a variable-frequency induced draft fan.

The swing chain ash removal module is provided with a speed reducing motor, a hollow tube shaft, a chain fixing support, a chain, a coupler, a bearing support, a balancing weight, a swing needle and a contact switch; the speed reducing motor is connected with the coupler, the coupler is connected with the bearing support, the bearing support is connected with the hollow tube shaft, the hollow tube shaft is provided with a chain fixing support and a balancing weight, the chain fixing support is provided with a chain, and both sides of the hollow tube shaft are provided with contact switches; the cooling module is provided with a cooling calandria and a waist round orifice plate.

The cooling module is made of steel or aluminum; the width dimension of the cross section of the cooling calandria is 25-50 mm, and the length-width ratio of the cooling calandria is 1:0.2 to 1:0.05, the wall thickness dimension of the cooling calandria is 1-2.5 mm, and the length dimension of the cooling calandria is 1.2-2.5 m.

The kidney-shaped pore plates are formed by arranging kidney-shaped holes on a flat plate in an array manner, the number of the kidney-shaped pore plates arranged in the length direction of one cooling module is 4-10, and the number of the kidney-shaped pore plates arranged in the width direction is 30-96; the distance between the length direction and the width direction of the waist round hole plate is 25-50 mm; the cooling module is manufactured by overlapping and butt welding the end face of the cooling calandria and the edge of the hole of the waist round hole plate.

The beneficial effects of the utility model are that

1. The structure enables the flue gas and the natural wind to flow from different pipelines without mixing with each other. The wet hardening condition of the terylene needled felt cloth bag caused by uneven mixing can not occur, the service life of the terylene needled felt cloth bag is prolonged, and the filtering effect of the purifying system is improved.

2. The structural design of the smoke path in the air cooling device can effectively collect and separate large-particle dust in smoke, reduce excessive grinding and cutting of the large-particle dust on filter cloth fibers of the filter bag, further prolong the service life of the filter bag and improve the economical efficiency of a purification system.

3. The device saves the air quantity which is increased by the filtration of the dust remover caused by the fact that the natural air of the atmosphere with the mass of 20-35% of the flue gas is gathered into the flue, reduces the volume of the purifying device, further reduces the energy consumption of the system and saves the construction materials.

Drawings

FIG. 1 is a schematic diagram of a flue gas air-cooling device of a high-efficiency aluminum smelting furnace;

FIG. 2 is a schematic diagram of a primary cooler;

FIG. 3 is a schematic diagram of a two-stage cooler;

FIG. 4 is a schematic view of a cooling gauntlet;

FIG. 5 is a schematic view of a kidney-shaped orifice plate;

FIG. 6 is a schematic diagram of a swing chain ash removal module and cooling module configuration;

FIG. 7 is a schematic diagram of a cooling module;

FIG. 8 is a flow chart of a flue gas air cooling and cooling device of the high-efficiency aluminum smelting furnace;

FIG. 9 is a schematic diagram of the arrangement of the flue gas collecting flues after primary cooling treatment by the V-shaped back-off cover plate;

FIG. 10 is a schematic diagram of a swing chain ash removal module;

reference numerals: 1-1, a thermal resistance temperature sensor a,1-2, a thermal resistance temperature sensor b,2, a cooler inlet flue, 3, a swing chain ash removal module, 31, a speed reduction motor, 32, a hollow tube shaft, 33, a chain fixing support, 34, a chain, 35, a coupler, 36, a bearing support, 37, a balancing weight, 38, a swing needle, 39, a contact switch, 4, a variable frequency induced draft fan, 5, a bag dust remover, 6, a V-shaped back-off cover plate, 7, a cooling module, 71, a cooling calandria, 72, a waist round hole plate, 8, a flue gas collecting flue after primary cooling treatment, 9, an air outlet air valve, 10, an air inlet air valve, 11, an air circulation adjustable opening air valve, 12, a circulating air pipeline, 13, an air cooling air inlet air duct, 14, an axial fan, 15, a screw conveyor, 16, a discharger, 17, an ash collecting box, 18, an air cooling air outlet air duct, 19, a flue gas collecting channel after secondary cooling treatment, 20 and a flue gas shutoff valve.

Detailed Description

The present utility model will be described in further detail with reference to the accompanying drawings.

1-7, 9 and 10, the high-efficiency aluminum smelting furnace flue gas air-cooling device comprises a thermal resistance temperature sensor a1-1, a thermal resistance temperature sensor b1-2, a cooler inlet flue 2, a swing chain ash removal module 3, a variable frequency induced draft fan 4, a bag-type dust collector 5, a V-shaped back-off cover plate 6, a cooling module 7, a flue gas collecting flue 8 after primary cooling treatment, an air outlet air valve 9, an air inlet air valve 10, an air circulation adjustable opening air valve 11, a circulating air pipeline 12, an air cooling air inlet air channel 13, an axial flow fan 14, a spiral conveyor 15, a discharger 16, an ash collecting box 17, an air cooling air outlet air channel 18, a flue gas collecting channel 19 after secondary cooling treatment and a flue cut-off valve 20;

the inlet of the cooler inlet flue 2 is provided with a flue stop valve 20 and a thermal resistance temperature sensor a1-1, the cooler inlet flue 2 is connected with a primary cooler, the primary cooler comprises a primary cooler a1 and a primary cooler a2, the primary cooler and the secondary cooler are respectively provided with a cooling module 7 and a swing chain ash removal module 3, the primary cooler and the secondary cooler are respectively provided with an air-cooling air inlet flue 13, an air-cooling air outlet flue 18, a circulating air pipeline 12 and an axial fan 14, the air-cooling air outlet flue 18 is provided with an air outlet air valve 9, the circulating air pipeline 12 is provided with an air inlet air valve 10 and an air circulation adjustable opening air valve 11, the primary cooler is also provided with a V-shaped inverted cover plate 6, the primary cooler and the secondary cooler are respectively provided with a screw conveyor 15, the screw conveyor 15 is connected with an unloader 16, the unloader 16 is connected with an ash collection box 17, the primary cooler is connected with a secondary cooler through a collection flue 8 after primary cooling treatment, and the secondary cooler is connected with a collection flue 19 through a collection bag 5 after secondary cooling treatment; the thermal resistance temperature sensor b1-2 is arranged between the secondary cooler and the bag-type dust remover 5, and the bag-type dust remover 5 is connected with the variable frequency induced draft fan 4.

The swing chain ash removal module 3 is provided with a gear motor 31, a hollow tube shaft 32, a chain fixing support 33, a chain 34, a coupler 35, a bearing support 36, a balancing weight 37, a swing needle 38 and a contact switch 39; the gear motor 31 is connected with a coupler 35, the coupler 35 is connected with a bearing support 36, the bearing support 36 is connected with a hollow tube shaft 32, the hollow tube shaft 32 is provided with a chain fixing support 33 and a balancing weight 37, the chain fixing support 33 is provided with a chain 34, and both sides of the hollow tube shaft 32 are provided with contact switches 39; the cooling module 7 is provided with a cooling gauntlet 71 and a kidney-shaped orifice 72.

The cooling module is made of steel or aluminum; the width dimension of the cross section of the cooling calandria is 25-50 mm, and the length-width ratio of the cooling calandria is 1:0.2 to 1:0.05, the wall thickness dimension of the cooling calandria is 1-2.5 mm, and the length dimension of the cooling calandria is 1.2-2.5 m.

The kidney-shaped pore plates are formed by arranging kidney-shaped holes on a flat plate in an array manner, the number of the kidney-shaped pore plates arranged in the length direction of one cooling module is 4-10, and the number of the kidney-shaped pore plates arranged in the width direction is 30-96; the distance between the length direction and the width direction of the waist round hole plate is 25-50 mm; the cooling module is manufactured by overlapping and butt welding the end face of the cooling calandria and the edge of the hole of the waist round hole plate.

The flue gas air cooling device of the high-efficiency aluminum smelting furnace is shown in fig. 8, and the control steps are as follows:

1. the air outlet air valve 9 and the air inlet air valve 10 are fully opened, the air circulation adjustable opening air valve 11 is closed, and then the axial flow fan 14 is started. Outdoor air enters the axial flow fan 14 from the inlet air valve 10 and then sequentially passes through the air cooling air inlet air duct 13, the cooling module 7 and the air cooling air outlet air duct 18. After the cooling air reaches the air-cooled air outlet duct 18, all the cooling air is discharged to the atmosphere from the air outlet damper 9.

2. The full-open flue cut-off valve 21 starts the variable frequency induced draft fan 4. The working frequency of the variable-frequency induced draft fan 4 is gradually increased, and the flue gas of the aluminum smelting furnace enters the air cooling device and is equally divided into the primary coolers a1 and a2 through the cooler inlet flue 2. The flue gas passes from top to bottom through a plurality of groups of cooling modules 7 consisting of cooling gauntlets 71 and kidney-shaped orifice plates 72. And then the flue gas is guided into a secondary cooler together through a flue gas collecting flue 8 after primary cooling treatment. After leaving the flue gas collecting flue 8 after the primary cooling treatment, the flue gas passes through a plurality of groups of cooling modules 7 from bottom to top. The cooled flue gas with the temperature lower than 120 ℃ is guided into the bag-type dust collector 5 through a flue gas collecting channel 19 after secondary cooling treatment.

3. After the variable frequency induced draft fan 4 reaches stable working frequency, the opening of the air circulation adjustable opening air valve 11 is adjusted according to the thermal resistance temperature sensor b1-2, the cooling capacity is adapted, and the energy consumption of the cooler is further reduced. If the temperature of the thermal resistance temperature sensor b1-2 is lower than 95 ℃, increasing the valve opening of the air circulation adjustable opening air valve 11, reducing the entering amount of cooling air and increasing the air circulation amount in the cooler; otherwise, if the temperature of the thermal resistance temperature sensor b1-2 is higher than 120 ℃, the valve opening of the air circulation adjustable opening air valve 11 is reduced, the inlet amount of cooling air is increased, and the air circulation amount in the cooler is reduced. Until the temperature of the thermal resistance temperature sensor b1-2 is stable in the range of 100-115 ℃, the air circulation adjustable opening air valve 11 keeps the current opening. The temperature of the flue gas of the smelting furnace changes periodically, when the temperature of the thermal resistance temperature sensor b1-2 is not in the range of 100-115 ℃, the step of operation is continued until the air circulation adjustable opening air valve 11 is closed or fully opened.

4. The thermal resistance temperature sensor a1-1 is interlocked with the flue cut-off valve 20 and the variable frequency induced draft fan 4. If the temperature of the flue gas detected by the thermal resistance temperature sensor a1-1 is higher than 280 ℃, the variable frequency induced draft fan 4 is immediately turned off, the flue cut-off valve 20 is turned off after 30-60 seconds, and the filter bag of the bag-type dust collector 5 is protected from being burnt by the hot flue gas, so that the service life is prolonged. And normally operating the air cooling device during the period.

5. The flue gas passes through the primary cooler and is vertically downward, and after entering the flue gas collecting flue 8 after primary cooling treatment, large particle dust can downwards impact the flue wall surface of the flue gas collecting flue 8 after primary cooling treatment and the upper cover surface of the V-shaped back-off cover plate 6 along with the inertia of the flue gas. The movement speed of the large-particle dust is rapidly reduced, and the movement direction is rapidly changed from vertical to horizontal. Because the cross-sectional area of the flue gas collecting flue 8 after the primary cooling treatment is about 15% -20% larger than that of the cooling modules 7 in the primary coolers a1 and a2, the flow speed of the flue gas entering the flue gas collecting flue 8 after the primary cooling treatment through the cooling modules 7 in the primary coolers a1 and a2 is slowed down. Large particle dust in the flue gas gradually subsides in the flue gas collecting flue 8 after the primary cooling treatment of the long straight pipe and falls into the area below the V-shaped back-off cover plate 6. The screw conveyor 15 then conveys the dust to the discharger 16 and into the dust collection bin 17.

With long accumulation of equipment in use, smoke dust adheres to the outer surface of the cooling gauntlet 71, so that the heat conductivity of the cooling die 7 is reduced, and the working efficiency of the cooler is affected. The swing chain ash removal module 3 in the air cooling device periodically cleans the flue gas and dust attached to the outer surface of the cooling calandria 71. The gear motor works, and torque is transmitted to the hollow tube shaft 32 through the coupler 35, and the chain fixing bracket 33, the balancing weight 37 and the balance pin 38 which are rigidly connected to the hollow tube shaft 32 rotate. The chain 34 is driven on the chain fixing bracket 33. The chain 34 and the flue gas are in the same flow field, and are swung between the cooling gauntlets 71 under the influence of the flow of the flue gas, and the dust attached to the cooling gauntlets 71 is scraped off. The balance needle rotates to the contact switch, the trigger switch is stopped, and then the gear motor rotates reversely until the balance needle 38 touches the contact switch on the other side. The above steps are repeated for a plurality of times, thereby realizing the purpose of cleaning the surface of the cooling drain pipe 71.

While the utility model has been described in detail in terms of general description and specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, it is intended to claim all such modifications or improvements as may be made without departing from the spirit of the utility model.

Claims (8)

1. The flue gas air-cooling device of the high-efficiency aluminum smelting furnace is characterized by comprising a thermal resistance temperature sensor, a speed reducing motor, a primary cooler, a secondary cooler, a screw conveyor, a discharger, an ash collecting box, a swing chain ash cleaning module, a variable-frequency induced draft fan, a bag-type dust remover, a V-shaped inverted buckle cover plate, a cooling module, an axial flow fan and a cooler inlet flue;

the primary cooler and the secondary cooler are respectively provided with a cooling module and a swing chain ash removal module, the primary cooler and the secondary cooler are respectively provided with an air cooling air inlet duct, an air cooling air outlet duct, a circulating air duct and an axial flow fan, the primary cooler is also provided with a V-shaped back-off cover plate, the primary cooler and the secondary cooler are respectively provided with a screw conveyer, the screw conveyer is connected with a discharger, the discharger is connected with an ash collecting box, the primary cooler is connected with the secondary cooler through a flue gas collecting flue after primary cooling treatment, and the secondary cooler is connected with a bag-type dust remover through a flue gas collecting channel after secondary cooling treatment; and a thermal resistance temperature sensor is arranged between the secondary cooler and the bag-type dust remover.

2. The high-efficiency aluminum smelting furnace flue gas air-cooling device according to claim 1, wherein the primary cooler comprises a primary cooler a1 and a primary cooler a2.

3. The high-efficiency aluminum smelting furnace flue gas air-cooling device according to claim 1, wherein a flue stop valve and a thermal resistance temperature sensor are arranged at the inlet of a cooler inlet flue, and the cooler inlet flue is connected with a primary cooler.

4. The efficient aluminum smelting furnace flue gas air-cooling device according to claim 1, wherein the air-cooling air outlet air duct is provided with an air outlet air valve, and the circulating air pipeline is provided with an air inlet air valve and an air circulation adjustable opening air valve.

5. The efficient aluminum smelting furnace flue gas air-cooling device according to claim 1, wherein the bag-type dust remover is connected with a variable-frequency induced draft fan.

6. The flue gas air-cooling and cooling device of the high-efficiency aluminum smelting furnace according to claim 1, wherein the swing chain ash removal module is provided with a speed reducing motor, a hollow tube shaft, a chain fixing support, a chain, a coupling, a bearing support, a balancing weight, a swing needle and a contact switch; the gear motor that the swing chain deashing module set up links to each other with the shaft coupling, the shaft coupling links to each other with the bearing support, the bearing support links to each other with hollow tube axle, hollow tube axle is equipped with chain fixed bolster and balancing weight, chain fixed bolster is equipped with the chain, and hollow tube axle both sides are equipped with contact switch.

7. The high-efficiency aluminum smelting furnace flue gas air-cooling device according to claim 1, wherein the cooling module is made of steel or aluminum; the cooling module is provided with a cooling calandria and a waist round orifice plate; the width dimension of the cross section of the cooling calandria is 25-50 mm, and the length-width ratio of the cooling calandria is 1: 0.2-1: 0.05, the wall thickness dimension of the cooling calandria is 1-2.5 mm, the length dimension of the cooling calandria is 1.2-2.5 mm, and the kidney-shaped pore plates are formed by arranging kidney-shaped holes on a flat plate in an array manner.

8. The high-efficiency aluminum smelting furnace flue gas air-cooling device according to claim 1, wherein the number of the kidney-shaped pore plates arranged in the length direction of the cooling module is 4-10, and the number of the kidney-shaped pore plates arranged in the width direction is 30-96; the distance between the length direction and the width direction of the kidney-shaped pore plate is 25-50 mm; the cooling module is formed by overlapping and butt welding the end face of the cooling calandria and the edge of the hole of the waist round hole plate.

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