CN207662218U - Aluminium melting furnace residual heat using device - Google Patents

Abstract

The utility model discloses a waste heat utilization device of an aluminum melting furnace, comprising: a furnace body, at least three burners and a first heat exchanger, the first heat exchanger includes an outer shell, a main smoke inlet pipe provided with a medium-temperature flue gas inlet, A smoke exhaust main pipe with a low-temperature flue gas outlet, an air intake main pipe with a cold air inlet, an exhaust main pipe with a hot air outlet, and at least six rotating waste heat recovery units arranged horizontally at intervals in the outer casing Each rotary waste heat recovery device is connected to the smoke inlet main pipe, smoke exhaust main pipe, air intake main pipe, and exhaust main pipe through pipelines; the medium-temperature flue gas inlet of the heat exchanger is connected to the smoke exhaust pipe through pipelines, the first The low-temperature flue gas outlet of the heat exchanger is connected to the chimney through pipelines, the cold air inlet of the first heat exchanger is connected to the air source through pipelines, and the hot air outlet of the first heat exchanger is connected to at least three burners through pipelines , so as to deliver the hot air formed after heat exchange to at least three burners for combustion support.

Description

Aluminum melting furnace waste heat utilization device

technical field

The utility model relates to an industrial furnace, in particular to an aluminum melting furnace.

Background technique

In recent years, as a new type of industrial furnace, aluminum melting furnaces have been widely used in metal smelting, but the following problems often exist in the smelting process: energy waste, environmental pollution, and poor working conditions due to insufficient recovery systems; Discontinuous production, low production efficiency, and reduced labor intensity caused by unreasonable equipment design; uneven heating and poor product quality caused by improper burner design and large furnace capacity.

For example, Chinese patent application No. 201420527169.8 discloses a large-scale aluminum melting furnace hedging type regenerative combustion system, including: a furnace body, the furnace body is provided with a furnace for combustion and heat release; and two fuel spray guns, the two fuel spray guns are symmetrical It is arranged on the two end walls of the furnace body. Moreover, on the two end walls of the furnace body, an air inlet and an air outlet are respectively arranged on both sides of each fuel spray gun. The system further includes: four thermal storage units, each thermal storage unit includes a cold air inlet, a hot air outlet, a high-temperature flue gas inlet, and a low-temperature flue gas outlet, and the hot air outlet and high-temperature flue gas inlet of each thermal storage unit are respectively Connected to the air inlet and outlet on one side of one of the fuel spray guns through pipes, the cold air inlet of each heat storage unit is connected to the air source through pipes, and the low-temperature flue gas outlet of each heat storage unit is connected to the air source through pipes. a chimney; and a control valve arranged on each pipeline for controlling each heat storage unit to switch between a heat storage state and a heat release state. However, in this scheme, a large number of heat storage units are used to recycle the residual temperature of the flue gas, and the heat is only used to exchange heat for the combustion air, and other energy cannot be converted, and when the heat storage unit fails, Replacement costs are higher.

Another example is Chinese patent application No. 201510810516.7 which discloses a flue gas recirculation assisted combustion type aluminum melting furnace, comprising: an aluminum melting furnace body, an aluminum melting furnace body including a furnace located inside, a combustion chamber located in the middle and upper part of the furnace, and a The molten aluminum pool at the lower part of the furnace, and the high-temperature flue gas outlet located on the side wall of the aluminum melting furnace body and connected to the combustion chamber; at least one main combustion gun, at least one main combustion gun is located on one end wall of the aluminum melting furnace body for In the combustion chamber, the injected fuel burns to release heat to melt the aluminum in the molten aluminum pool into molten aluminum; and the flue gas pipe connects the high-temperature flue gas outlet to the chimney. Wherein, the flue gas recirculation auxiliary combustion type aluminum melting furnace further includes: an auxiliary combustion gun, the auxiliary combustion gun and at least one main combustion gun are arranged at an end wall of the aluminum melting furnace body at intervals; and a flue gas return pipe, a flue gas return pipe It communicates with the flue gas pipe to return part of the high-temperature flue gas in the flue gas pipe to the auxiliary combustion gun for combustion. However, the flue gas recirculation assisted combustion type aluminum melting furnace only uses part of the high-temperature flue gas backflow for combustion-supporting, and does not disclose how to recycle most of the heat of the high-temperature flue gas, resulting in a huge waste of energy.

Another example is Chinese Patent Application No. 201610384395.9 which discloses a cascade utilization system for flue gas waste heat from an aluminum melting furnace, which includes an aluminum melting furnace, the flue gas pipe outlet of the aluminum melting furnace is connected to a flue gas filter, and the flue gas filter The air outlet branch pipe of device one is connected with the aluminum material preheating mechanism, the flue gas outlet of the aluminum material preheating mechanism is connected with the first dust collector, and the first dust collector is connected with the flue gas waste heat recovery device; the flue gas filter Another air outlet branch pipe is directly connected to the second dust remover, and the second dust remover is connected to the air preheater; one outlet of the air preheater enters the aluminum melting furnace through the combustion-supporting air, and the other outlet of the air preheater It enters the steam waste heat boiler through the economizer, and the first outlet of the steam waste heat boiler is connected with the flue gas waste heat recovery device. However, once the waste heat utilization device in the aluminum melting furnace flue gas waste heat cascade utilization system in this patent fails, the replacement cost is high and the replacement is difficult, and the work of the entire aluminum melting furnace needs to be stopped to complete.

Therefore, it is an urgent problem to be solved in the industry to provide an energy-saving, environment-friendly and high-production-efficiency aluminum melting furnace waste heat utilization device.

Contents of the invention

The purpose of the utility model is to provide an aluminum melting furnace waste heat utilization device with energy saving, environmental protection, high production efficiency and uniform heating in the furnace.

In order to achieve the above purpose, the utility model provides a waste heat utilization device of an aluminum melting furnace, which includes: a furnace body, a furnace for combustion and heat release; at least three burners, at least three burners are arranged in the furnace at intervals The front end of the furnace is connected with the hearth of the furnace body to inject gas and combustion-supporting gas into the furnace body to burn and release heat; wherein, the furnace body is connected with a smoke exhaust pipe on the top wall of the rear end of the far and near furnace, and the flue gas along the smoke exhaust pipe A first heat exchanger is provided in the flow direction, and the first heat exchanger includes an outer shell, a smoke inlet main pipe with a medium-temperature flue gas inlet, a smoke exhaust main pipe with a low-temperature flue gas outlet, and an air intake main pipe with a cold air inlet , an exhaust main pipe with a hot air outlet, and at least six rotating waste heat recoverers arranged horizontally at intervals in the outer casing, each rotating waste heat recoverer is respectively connected to the smoke inlet main pipe, the smoke exhaust main pipe, The inlet main pipe and the exhaust main pipe are connected; the medium-temperature flue gas inlet of the heat exchanger is connected with the exhaust pipe through the pipeline, the low-temperature flue gas outlet of the first heat exchanger is connected with the chimney through the pipeline, and the first heat exchanger The cold air inlet is connected to the air source through pipelines, and the hot air outlet of the first heat exchanger is connected to at least three burners through pipelines, so as to deliver the hot air formed after heat exchange to at least three burners for Combustion-supporting; wherein, each rotary waste heat recovery device includes an outer cylinder, a rotating heat storage disc arranged in the outer cylinder coaxially with the outer cylinder, a first partition arranged on one side of the rotating heat storage disk, and a rotating The second partition on the other side of the heat storage disk; the first partition and the second partition are located on the same longitudinal section of the outer cylinder, and the first partition divides the front section of the outer cylinder into the first flue flow channel and the second partition. The first air flow channel and the second partition divide the rear section of the outer cylinder into the second smoke flow channel and the second air flow channel; the top wall of the outer cylinder corresponding to the first smoke flow channel is provided with a second A flue gas port, the second flue gas port is opened on the bottom wall of the outer cylinder corresponding to the second flue gas flow channel, and the first air port is opened on the side wall of the outer cylinder corresponding to the first air flow channel, corresponding to A second air port is opened on the side wall of the outer cylinder of the second air passage; the first flue gas port is connected to the main smoke inlet pipe through the smoke inlet branch pipe, and the second flue gas port is connected to the smoke exhaust main pipe through the smoke exhaust branch pipe. The first air port is connected to the exhaust main pipe through the exhaust branch pipe, and the second air port is connected to the intake main pipe through the intake branch pipe.

Optionally, the rotating thermal storage disc includes a porous bottom wall, a porous top wall, peripheral side walls extending from a periphery of the porous bottom wall to a peripheral edge of the porous top wall, a central pivot shaft disposed along a longitudinal axis of the rotating thermal storage disc, and At least eight grid plates extending from the central pivot shaft to the peripheral side wall in the radial direction of the rotating heat storage disk, wherein the porous bottom wall, the porous top wall, the peripheral side wall, the central pivot shaft and the adjacent two grid plates Each space forms a heat exchange chamber for storing heat storage materials.

Preferably, one end of the first partition adjacent to the rotating heat storage disk is adjacent to the upper surface of the porous top wall of the rotating heat storage disk, and one end of the second partition adjacent to the rotating heat storage disk is adjacent to the porous bottom wall of the rotating heat storage disk. The lower surface, the outer wall surface of the peripheral side wall of the rotating heat storage disk is adjacent to the inner wall surface of the outer cylinder of the rotating waste heat recovery device.

Preferably, the distance between the end of the first partition adjacent to the rotating heat storage disk and the upper surface of the porous top wall of the rotating heat storage disk is less than or equal to 1 mm, and the distance between the end of the second partition adjacent to the rotating heat storage disk and the rotating heat storage disk The distance between the lower surfaces of the porous bottom wall of the heating plate is less than or equal to 1 mm, and the distance between the inner wall of the outer cylinder and the outer wall of the peripheral side wall of the rotating heat storage plate is less than or equal to 1 mm.

Preferably, the upper partition and the lower partition of the rotary waste heat recovery device can be located on the same longitudinal section of the outer cylinder that does not pass through the longitudinal axis, such as making the cross section of the flue gas flow channel larger than the cross section of the air flow channel, To increase the temperature of the hot air after heat exchange.

Preferably, each heat exchange chamber can rotate around the longitudinal axis of the outer cylinder at a constant speed from the flue flow path to the air flow path so as to absorb waste heat of high-temperature flue gas in the flue gas flow path and heat the air in the air flow path.

Preferably, the heat storage material contained in the heat exchange chamber may be ceramic balls, honeycomb heat storage bodies, composite heat storage materials, and the like.

Optionally, control valves are respectively provided on the smoke inlet branch pipe and the air intake branch pipe of each rotary waste heat recovery device, and the control valves on the smoke inlet branch pipe and the air intake branch pipe of the same rotary preheat recovery device are opened or closed at the same time, so as to realize At least six rotating waste heat recoverers work alternately.

Preferably, the control valve can be an electric switch valve or a solenoid valve.

Optionally, the first flue gas port and the second flue gas port are located on the same longitudinal section of the outer cylinder; the first air port and the second air port are located on two opposite side walls of the outer cylinder.

Optionally, a second heat exchanger is provided upstream of the exhaust pipe. The second heat exchanger includes a high-temperature flue gas inlet, a medium-temperature flue gas outlet, a cold water inlet, and a hot water outlet. The high-temperature flue gas inlet passes through the pipeline and the exhaust gas. The smoke pipes are connected, and the medium-temperature flue gas outlet of the second heat exchanger is connected with the medium-temperature flue gas inlet of the first heat exchanger through pipelines.

Optionally, the aluminum melting furnace flue gas recycling system is further equipped with a screw generator, and the hot water from the hot water outlet of the second heat exchanger is transported through pipelines to the cold water returned to the second heat exchanger after the screw generator generates electricity. Entrance.

Among them, the screw generator adopts the screw expander power generation technology, and its working principle is to push the male and female screws to rotate in opposite directions through the volume expansion of the thermal fluid in the channel of the male and female screws, so as to realize the work process of converting heat energy into mechanical energy.

Preferably, a first fan is provided at the cold air inlet of the first heat exchanger to introduce the cold air into the first heat exchanger.

Preferably, a second blower fan is provided in the smoke exhaust main pipe to transport the high-temperature flue gas to the second heat exchanger.

Wherein, the fuel can be natural gas or coal gas.

The beneficial effects of the utility model are: (1), multiple rotating waste heat recoverers work alternately, which can not only prolong their service life, but also make maintenance and replacement more convenient, effectively reducing operating costs, and during the replacement process, The aluminum melting furnace can work uninterruptedly; (2), using flue gas backflow to support combustion, so that the content of carbon dioxide and nitrogen oxides in the flue gas discharged into the environment is fully reduced; (3), using the first heat exchange device to cool the high-temperature flue gas Recycling; (4) Using the first heat exchanger and the second heat exchanger to recycle the flue gas twice, not only can generate electricity for use, but also can heat the air and then use it as a combustion-supporting gas , Fully improve the flue gas waste heat recovery rate, and further ensure the stability of the furnace temperature.

Description of drawings

Fig. 1 shows a schematic structural view of an embodiment of the waste heat utilization device of an aluminum melting furnace of the present invention.

Fig. 2 shows a schematic diagram of the longitudinal structure of the first heat exchanger of the present invention.

Fig. 3 shows the schematic diagram of the top view structure of the first heat exchanger of the present invention

Fig. 4 shows a schematic view of the structure of a single rotary waste heat recovery device of the present invention.

Fig. 5 shows a schematic diagram of the internal structure of the rotating heat storage disk of the rotating waste heat recovery device of the present invention.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

Please refer to Fig. 1, as a non-limiting embodiment, the aluminum melting furnace flue gas recycling system of the present invention includes: three burners 10, 20 and 30, a furnace body 100, a first heat exchanger 200, a second Two heat exchangers 300, a chimney 400 and a screw generator 500.

As shown in FIG. 1 , three burners 10 , 20 and 30 are arranged at intervals at the front end of the furnace body 100 and communicate with the hearth of the furnace body 100 , so as to inject gas and combustion-supporting gas into the furnace body to burn and release heat.

A smoke exhaust pipe L is connected to the top wall of the rear end of the furnace body 100 , and the first heat exchanger 200 and the second heat exchanger 300 are arranged in sequence along the flue gas flow direction of the smoke exhaust pipe L. The second heat exchanger 300 includes a high temperature flue gas inlet 301 , a medium temperature flue gas outlet 302 , a cold water inlet 303 and a hot water outlet 304 .

As shown in Figures 2 and 3, the first heat exchanger 200 includes an outer shell 201, a smoke inlet main pipe 206 with a medium-temperature flue gas inlet 202, a smoke exhaust main pipe 207 with a low-temperature flue gas outlet 203, a cold air An air intake manifold 208 at the inlet 204 , an exhaust manifold 209 with a hot air outlet 205 , and six rotating waste heat recoverers 210 housed in the outer casing 201 are horizontally arranged at intervals.

The medium-temperature flue gas inlet 202 of the first heat exchanger 200 is connected to the medium-temperature flue gas outlet 302 of the second heat exchanger 300 through pipelines, the low-temperature flue gas outlet 203 of the first heat exchanger 200 is connected to the chimney 400, and the first heat exchanger The cold air inlet 204 of the device 200 is connected to an air source (not shown) through a pipeline, and the hot air outlet 205 of the first heat exchanger 200 is connected to the main burner 10 through a pipeline, so that the hot air formed after heat exchange Delivered to the main burner 10 for combustion.

As shown in Figure 4, each rotary waste heat recovery device 210 includes an outer cylinder body 2101, a rotating heat storage disk 2102 coaxially arranged in the outer cylinder body 2101, and a rotating heat storage disk 2102 arranged on one side of the rotating heat storage disk 2012. The first partition 2103, the second partition 2104 arranged on the other side of the rotating heat storage disk 2102, the first partition 2103 divides the front section of the outer cylinder 2101 into the first smoke flow channel 2105 and the first air flow channel 2106 , and the second separator 2104 divides the rear section of the outer cylinder 2101 into a second smoke flow channel 2107 and a second air flow channel 2108 .

The top wall of the outer cylinder 2101 corresponding to the first smoke flow channel 2105 is provided with a first smoke port 210A, and the bottom wall of the outer cylinder 2101 corresponding to the second smoke flow channel 2107 is opened with a second smoke port 210B, a first air port 210C is opened on the side wall of the outer cylinder 2101 corresponding to the first air channel 2106 , and a second air port 210D is opened on the side wall of the outer tube 2101 corresponding to the second air channel 2108 . The first flue gas port 210A is connected to the main smoke inlet pipe 206 through the smoke inlet branch pipe 2061, the second flue gas port 210B is connected to the smoke exhaust main pipe 207 through the smoke exhaust branch pipe 2071, and the first air port 210C is connected to the exhaust gas branch pipe 2091. The air main pipe 209 is connected, and the second air port 210D is connected with the air intake main pipe 208 through the air intake branch pipe 2081 . Moreover, the first flue gas port 210A and the second flue gas port 210B are located on the same longitudinal section of the outer cylinder 2101 . The first air port 210C and the second air port 210D are located on two opposite side walls of the outer cylinder 2101 .

As shown in Figure 2 and Figure 3, the smoke inlet branch pipe 2061 and the intake branch pipe 2081 of each rotary waste heat recovery device 210 are respectively provided with a control valve V, and the smoke inlet branch pipe 2061 and the intake pipe branch pipe 2061 of the same rotary preheat recovery device 210 The control valve V on the gas distribution pipe 2081 is opened or closed at the same time, so that the six rotating waste heat recoverers can work alternately. In this embodiment, it is possible to control the three rotary waste heat recoverers to be in the working state, while the remaining three rotary waste heat recoverers are in the stop state, or when the flue gas volume is large, four or more rotary waste heat recoverers are turned on Similarly, when the flue gas volume is small, only two rotary waste heat recovery devices can be turned on.

In this non-limiting embodiment, as shown in FIG. 4 and FIG. 5 , the rotating thermal storage disk 2102 includes a porous top wall 21021 , a porous bottom wall 21022 , and a wall extending from the periphery of the porous bottom wall 21022 to the periphery of the porous top wall 21021 . The peripheral sidewall 21023 , the central pivot shaft 21024 arranged along the longitudinal axis of the rotating heat storage disk 2102 , and the eight grid plates 21025 extending from the central pivot shaft 21024 to the peripheral sidewall 21023 along the radial direction of the rotating heat storage disk 2102 . Among them, a heat exchange chamber 21026 for accommodating ceramic balls is respectively formed between the porous top wall 21021, the porous bottom wall 21022, the peripheral side wall 21023, the central pivot shaft 21024, and two adjacent grid plates 21025. The bin 21026 can rotate around the longitudinal axis of the outer cylinder 2101 from the smoke flow channel to the air flow channel at a constant speed in order to absorb the waste heat of the medium-temperature smoke in the smoke flow channel and heat the air in the air flow channel.

Thus, the high-temperature flue gas of about 600 degrees Celsius in the furnace body 100 enters the second heat exchanger 300 from the high-temperature flue gas inlet 301 along the flue gas exhaust pipe L under the action of the second fan F2. The medium-temperature flue gas is discharged with the medium-temperature flue gas outlet 302, and the hot water of about 120 degrees Celsius formed after heat exchange is sent to the screw generator 500 for power generation through the hot water outlet 304 through the pipeline, and the hot water is turned into cold water of about 60 degrees Celsius after power generation The pipeline returns to the cold water inlet 303 in the second heat exchanger 300 , and the cold water enters the second heat exchanger 300 again to be heated to hot water for circulating operation.

The medium-temperature flue gas formed after heat exchange in the second heat exchanger 300 enters the main flue gas inlet pipe 206 through the middle-temperature flue gas inlet 202 of the first heat exchanger 200, and enters the first flue gas along the flue gas inlet branch pipe 2061 with the control valve V opened. The air flow channel 2105, after heat exchange by rotating the heat storage disk 2102, enters the second flue gas flow channel 2107 along the exhaust branch pipe 2071 and enters the exhaust main pipe 207, and is discharged from the low-temperature flue gas outlet 203 to the chimney 400. Under the action of the first fan F1, the cold air enters the air intake main pipe 208 from the cold air inlet 204 of the first heat exchanger 200, enters the second air flow channel 2108 along the air intake branch pipe 2081 of the opened control valve V, and passes through After the heat storage disk 2102 is rotated to exchange heat, it enters the first air flow channel 2106 and enters the exhaust main pipe 209 along the exhaust branch pipe 2091, and is transmitted from the high-temperature air outlet 205 to the burners 10, 20 and 30, so that the heated air is used as Gas-assisted use.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structures or features are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the preferred embodiment of the present utility model has been described in detail here, it should be understood that the present utility model is not limited to the specific structures described and shown in detail here, and can be made by Other modifications and variations will occur to those skilled in the art.

Claims (8)

1. a kind of aluminium melting furnace residual heat using device, including：

Furnace body, the interior burner hearth being equipped with for combustion heat release of the furnace body；

At least three burners, at least three burner gap be set to the front end of the burner hearth and with the stove of the furnace body Thorax is connected spraying combustion gas and combustion-supporting gas to combustion heat release in the furnace body；

It is characterized in that,

The furnace body on the roof of the rear end of the far and near burner hearth in being connected with smoke discharging pipe, along the flue gas stream of the smoke discharging pipe Dynamic direction is provided with First Heat Exchanger, the First Heat Exchanger includes outer housing, equipped with medium temperature smoke inlet into cigarette manifold, set Have low-temperature flue gas export smoke explorer, the inlet manifold equipped with cool air inlet, the exhaust main equipped with hot air outlet, with And at least six rotation waste-heat recoverers of the horizontal interval arrangement in the outer housing are placed in, each rotate waste-heat recoverer It is connected respectively into cigarette manifold, the smoke explorer, the inlet manifold and the exhaust main with described by pipeline；

The medium temperature smoke inlet of the heat exchanger is connected by pipeline with smoke discharging pipe, the low-temperature flue gas of the First Heat Exchanger Outlet is connected with by pipeline chimney, and the cool air inlet of the First Heat Exchanger is connected by pipeline with air-source, described The hot air outlet of First Heat Exchanger is connected by pipeline at least three burner；

Wherein, each rotation waste-heat recoverer includes outer barrel, is coaxially set in the outer barrel with the outer barrel Rotation heat-storage plate, the first partition for being set to the rotation heat-storage plate side, be set to the rotation heat-storage plate other side the Two partition boards；

The first partition and the second partition are located on the same longitudinal cross-section of the outer barrel, and the first partition is by institute The leading portion for stating outer barrel is divided into the first flue gas flow channel and the first air flow channel, and the second partition is by the back segment of the outer barrel It is divided into the second flue gas flow channel and the second air flow channel；

The first flue gas port is offered corresponding to the roof of the outer barrel of first flue gas flow channel, corresponds to described second The bottom wall of the outer barrel of flue gas flow channel offers the second flue gas port, corresponds to the outer barrel of first air flow channel The side wall of body offers the first air port, and second is offered corresponding to the side wall of the outer barrel of second air flow channel Air port；

First flue gas port is connected with described into cigarette manifold by being in charge of into cigarette, and second flue gas port passes through smoke evacuation It is in charge of and is connected with the smoke explorer, first air port is connected by exhaust charge with the exhaust main, institute It states the second air port and is in charge of by air inlet and is connected with the inlet manifold.

2. aluminium melting furnace residual heat using device as described in claim 1, which is characterized in that the rotation heat-storage plate includes porous bottom Wall, porous roof, all side walls extended from the periphery of the porous bottom wall to the periphery of the porous roof, along the rotation store The central pivotal axis of the longitudinal axis setting of hot plate and from the central pivotal axis along the radial direction of the rotation heat-storage plate At least eight panels extended to all side walls, wherein the porous bottom wall, the porous roof, all side walls, described A heat exchange storehouse for holding heat-storing material is respectively formed between central pivotal axis and two neighboring panel.

3. aluminium melting furnace residual heat using device as described in claim 1, which is characterized in that each to rotate the described of waste-heat recoverer It is in charge of into cigarette and the air inlet is in charge of and is respectively equipped with control valve.

4. aluminium melting furnace residual heat using device as claimed in claim 2, which is characterized in that first flue gas port and described the Two flue gas ports are located on the same longitudinal cross-section of the outer barrel；First air port and second air port position In in the opposite two side walls of the outer barrel.

5. aluminium melting furnace residual heat using device as claimed in claim 4, which is characterized in that set in the upstream end of the smoke discharging pipe It includes that high-temperature flue gas entry, medium temperature exhanst gas outlet, cold water inlet and hot water go out to have the second heat exchanger, second heat exchanger Mouthful, the high-temperature flue gas entry is connected by pipeline with the smoke discharging pipe, the medium temperature exhanst gas outlet of second heat exchanger It is connected by pipeline with the medium temperature smoke inlet of the First Heat Exchanger.

6. aluminium melting furnace residual heat using device as claimed in claim 5, which is characterized in that the aluminium melting furnace residual heat using device into One step is equipped with screw rod generator.

7. aluminium melting furnace residual heat using device as claimed in claim 5, which is characterized in that the cold air of the First Heat Exchanger enters The first wind turbine is equipped at mouthful.

8. aluminium melting furnace residual heat using device as claimed in claim 7, which is characterized in that be equipped with the second wind in the smoke explorer Machine.