CN102410744B - Waste heat comprehensive utilization system in aluminum profile production line - Google Patents

Abstract

The invention discloses a comprehensive waste heat utilization system of an aluminum profile production line, which consists of a smoke exhaust pipe, a smoke delivery pipe, a smoke delivery pipeline, a smoke exhaust valve, a smoke delivery valve, a safety valve, a heat exchanger, a blower fan and a smoke delivery valve. The gas transmission network connects the casting furnace, aluminum ingot preheating chamber, homogenizing furnace, aluminum rod heating furnace, aging furnace, curing furnace and drying furnace on the aluminum profile production line to form a comprehensive waste heat utilization system for the aluminum profile production line. The system can distribute the waste heat in the high-temperature flue gas discharged from the upstream high-temperature furnace on the aluminum profile production line to the downstream low-temperature furnaces, and the waste heat of each furnace can be fully utilized by the downstream furnaces. This system reduces the gas consumption of 250 cubic meters per ton of aluminum profiles to 130 cubic meters of gas per ton, saving energy by nearly 50%. Moreover, while reducing gas consumption, it also reduces the emission of various polluting gases. The system changes the high-temperature flue gas into low-temperature flue gas emission, which also reduces the cost of the flue gas dust removal system.

Description

A comprehensive utilization system of waste heat in aluminum profile production line

technical field

The invention relates to a waste heat utilization system, in particular to a comprehensive utilization system of waste heat in an aluminum profile production line.

Background technique

The production equipment on the existing aluminum profile production line, such as casting furnace, homogenizing furnace, aging furnace, etc., the high-temperature flue gas generated during the production process is discharged directly or after being treated by the dust removal system. The temperature of the high-temperature flue gas produced by the casting furnace reaches 800-1000°C, the temperature of the high-temperature flue gas emitted by the homogenizing furnace reaches about 600°C, and the temperature of the high-temperature flue gas emitted by the aging furnace can also reach 200°C. This kind of high-temperature flue gas emission, on the one hand, takes away nearly 50% of the heat in the production line, resulting in a large waste of gas, which is not conducive to the reduction of production costs; on the other hand, if the high-temperature flue gas is directly discharged, the flue gas contains A large amount of harmful gas is not conducive to environmental protection. If it is discharged after dust removal, the high-temperature flue gas has very high requirements on the dust removal system, and the construction cost of the dust removal system is very expensive.

Therefore, the prior art still needs to be improved and developed.

Contents of the invention

The purpose of the present invention is to provide a comprehensive utilization system for waste heat of an aluminum profile production line to solve the above-mentioned technical problems of huge waste of resources and high environmental protection costs caused by the direct discharge of high-temperature flue gas from the aluminum profile production line in the prior art.

Technical scheme of the present invention is as follows:

A comprehensive waste heat utilization system for an aluminum profile production line, including a melting and casting furnace, an aluminum ingot preheating chamber, a homogenizing furnace, an aluminum rod heating furnace, an aging furnace, a curing furnace, a drying furnace, a smoke exhaust pipe, a smoke delivery pipe, and a smoke delivery pipe , smoke exhaust valve, smoke delivery valve, safety valve, heat exchanger, blower and smoke delivery valve, in melting and casting furnace, aluminum ingot preheating chamber, homogenizing furnace, aluminum rod heating furnace, aging furnace, curing furnace, drying furnace There are smoke exhaust pipes on the smoke outlets of the aluminum ingot preheating chamber, homogeneous furnace, aluminum rod heating furnace, aging furnace, curing furnace, and drying furnace. The smoke exhaust pipe of the high temperature furnace in the furnace communicates with the smoke delivery pipeline of the low temperature furnace through the smoke delivery pipeline; the smoke exhaust valve is arranged at the smoke outlet of the smoke exhaust pipeline; the smoke delivery valve and the safety valve are arranged On the smoke delivery pipeline; the air blower and the smoke supply valve are arranged on the smoke supply pipeline, and the setting positions thereof are the blower fan and the smoke supply valve in sequence according to the air supply direction.

The comprehensive waste heat utilization system of the aluminum profile production line further includes a heat exchanger, and the heat exchanger is arranged on the smoke delivery pipes of each furnace.

The comprehensive waste heat utilization system of the aluminum profile production line further includes a water tank into which the exhaust pipe of the drying furnace is inserted, and a heat exchanger is arranged on the exhaust pipe of the drying furnace.

The waste heat comprehensive utilization system of the aluminum profile production line, wherein, the number of the melting and casting furnace is at least one, the number of the aluminum ingot preheating chamber is at least one, the number of the homogenizing furnace is at least one, and the aluminum There is at least one rod heating furnace, at least one aging furnace, at least one curing furnace, and at least one drying furnace.

The comprehensive waste heat utilization system of the aluminum profile production line further includes a monitoring system, the monitoring system includes a central processing unit, a data monitoring device and a control device, and the data monitoring device and the control device are set at the waste heat On each furnace body in the comprehensive utilization system, the data monitoring device and the control device are respectively electrically connected to the central processing unit.

In the comprehensive waste heat utilization system of the aluminum profile production line, the monitoring device includes a pressure monitor and a temperature monitor.

In the comprehensive waste heat utilization system of the aluminum profile production line, the control device includes a smoke exhaust valve, a smoke delivery valve, a safety valve, a heat exchanger, a blower fan and a smoke delivery valve.

The present invention transfers the melting and casting furnace on the aluminum profile production line to , aluminum ingot preheating chamber, homogeneous furnace, aluminum rod heating furnace, aging furnace, curing furnace and drying furnace are connected to form a comprehensive waste heat utilization system for aluminum profile production line. The system can distribute the waste heat in the high-temperature flue gas discharged from the upstream high-temperature furnace on the aluminum profile production line to the downstream low-temperature furnaces, and the waste heat of each furnace can be fully utilized by the downstream furnaces. This system reduces the gas consumption of 250 cubic meters per ton of aluminum profiles to 130 cubic meters of gas per ton, saving energy by nearly 50%. Moreover, while reducing gas consumption, it also reduces the emission of various polluting gases. The system changes the high-temperature flue gas into low-temperature flue gas emission, which also reduces the cost of the flue gas dust removal system.

Description of drawings

Fig. 1 is the structural schematic diagram of the waste heat comprehensive utilization system of the aluminum profile production line of the present invention;

Fig. 2 is a structural schematic diagram of the monitoring system in the waste heat comprehensive utilization system of the aluminum profile production line of the present invention;

Fig. 3 is a working flow diagram of the waste heat comprehensive utilization system of the aluminum profile production line of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

As shown in Figure 1, the structure diagram of the waste heat comprehensive utilization system of the aluminum profile production line in the present invention, the waste heat comprehensive utilization system of the aluminum profile production line includes a melting and casting furnace 1, an aluminum ingot preheating chamber 2, a homogenizing furnace 3, an aluminum rod heating furnace 4, Aging furnace 5, curing furnace 6, drying furnace 7, smoke exhaust pipe 8, smoke delivery pipe 9, smoke delivery pipeline 10, smoke exhaust valve 11, smoke delivery valve 12, safety valve 13, heat exchanger 14, blower 15 and Send smoke valve 16. In melting and casting furnace 1, aluminum ingot preheating chamber 2, homogenizing furnace 3, aluminum rod heating furnace 4, aging furnace 5, curing furnace 6 and drying furnace 7, except that melting and casting furnace 1 is only provided with smoke exhaust pipe 8 , all the other furnaces are provided with smoke exhaust pipe 8 and smoke delivery pipe 9 accordingly. The smoke exhaust pipe 8 of the upstream furnace and the smoke delivery pipe 9 of its adjacent downstream furnace are connected through the smoke delivery pipe 10, that is, the respective smoke exhaust pipes 8 of the melting and casting furnace 1, the homogeneous furnace 3 and the aging furnace 5 are connected with the aluminum ingot The heat chamber 2, the aluminum rod heating furnace 4 and the respective smoke delivery pipes 9 of the curing furnace 6 are connected adjacently, and the respective smoke exhaust pipes 8 of the aluminum ingot preheating chamber 2, the aluminum rod heating furnace 4 and the curing furnace 6 are connected to the homogeneous Furnace 3, aging furnace 5 and drying furnace 7 are adjacently connected to each other through smoke delivery pipes 9, and the smoke exhaust pipe of drying furnace 7 is directly discharged outward, or connected to a flue gas dedusting system. A smoke exhaust valve 11 is arranged at the smoke outlet of each smoke exhaust pipe 8, a smoke delivery valve 12 and a safety valve 13 are arranged on each smoke delivery pipeline 10 according to the needs of the system for controlling and distributing high-temperature smoke, and a heat exchanger 14 , air blower 15 and smoke delivery valve 16 are arranged on each smoke delivery pipe, and its setting position relationship is followed by heat exchanger 14, blower fan 15, smoke delivery valve 16 with the direction of smoke delivery. After the high-temperature flue gas is exchanged by the heat exchanger 14, the residual heat carried in it is sent to the downstream furnace through the blower 15. Among them, the flue gas temperature in melting and casting furnace 1 is close to 1050°C, the flue gas temperature in aluminum ingot preheating chamber 2 can reach 500°C, the flue gas temperature in homogenizing furnace 3 can reach 600°C, and the flue gas temperature in aluminum rod heating furnace 4 can reach 500°C. The temperature of the flue gas in the aging furnace 5 and the curing furnace 6 is only about 200°C, the temperature of the flue gas in the drying furnace 7 is about 80°C, and the waste heat in the flue gas discharged from the drying furnace It can be used for hot water after conversion by heat exchanger.

As shown in Figure 2, the structural diagram of the monitoring system in the comprehensive utilization system of waste heat of aluminum profile production line in the present invention, the comprehensive utilization system of waste heat of aluminum profile production line also includes a monitoring system, which is used to detect the inside of each furnace in the comprehensive utilization system of waste heat of aluminum profile production line The temperature and pressure state and control the distribution of high temperature smoke. The detection system includes a central processing unit 17, a melting and casting furnace data detection device 18, a melting and casting furnace control device 19, an aluminum ingot preheating chamber data monitoring device 20, an aluminum ingot preheating chamber control device 21, a homogeneous furnace data monitoring device 22, a Quality furnace control device 23, aluminum rod heating furnace data monitoring device 24, aluminum rod heating furnace control device 25, aging furnace data monitoring device 26, aging furnace control device 27, curing furnace data detection device 28, curing furnace control device 29, baking A drying furnace data monitoring device 20 and a drying furnace control device 31 . The above-mentioned data monitoring devices already exist on the existing aluminum profile production line, such as pressure monitors, temperature monitors (not shown in the figure), etc., which are installed in each furnace on the aluminum profile production line. In the present invention, each of the above-mentioned control devices is the smoke exhaust valve 11 shown in Fig. 1, the smoke delivery valve 12, the smoke delivery valve 16, the safety valve 13, the heat exchanger 14, the fan 15, etc., and the data monitoring device monitors each furnace After receiving the data, the data signal is sent to the central processing unit 17, and the central processing unit 17 makes a judgment according to the data signal and sends an operation command to each control device, and adjusts the distribution of high-temperature smoke by controlling the switch of each control device, so that The data in each furnace on the production line is in a normal state.

As shown in Figure 3, the working flow chart of the waste heat comprehensive utilization system of the aluminum profile production line in the present invention, the waste heat comprehensive utilization system of the aluminum profile production line distributes and utilizes waste heat under the control of its monitoring system. The monitoring system monitors and analyzes the data in each furnace on the aluminum profile production line, and uses its control device to control the switch of each valve in the waste heat comprehensive utilization system according to the analysis results, so as to distribute the waste heat. The basic process is as follows: 1. The high-temperature flue gas close to 1000 ℃ is discharged from the melting and casting furnace, which can be used by the aluminum ingot preheating chamber and the monitoring system through the aluminum rod heating furnace and curing furnace. The data in the aluminum ingot preheating chamber, aluminum rod heating furnace and curing furnace are analyzed to determine whether smoke is required. If no smoke is needed, the high-temperature flue gas is directly discharged from the casting furnace. 2. The high-temperature flue gas of about 500°C in the aluminum ingot preheating chamber can be used by the homogenizing furnace, aging furnace and drying furnace. The monitoring system analyzes the data in the homogenizing furnace, aging furnace and drying furnace. Determine if you need to smoke. If there is no need to enter the smoke, the high-temperature flue gas is directly discharged from the aluminum ingot heating furnace. 3. The temperature of the high-temperature flue gas in the homogeneous furnace can reach 600°C, which can be used in the aluminum rod heating furnace and curing furnace. The monitoring system analyzes the data in the aluminum rod heating furnace and curing furnace to determine whether it is necessary to enter the smoke . If there is no need to enter the smoke, the high-temperature flue gas is directly discharged from the homogeneous furnace. 4. The high-temperature flue gas in the aluminum rod heating furnace can also reach 500°C. After the flue gas flows out, it can be used in the aging furnace and drying furnace. The monitoring system analyzes the data in the aging furnace and drying furnace to determine its Do you need to smoke. If neither is needed, the high-temperature flue gas is directly discharged from the aluminum rod heating furnace. 5. The temperature of the high-temperature flue gas in the aging furnace is about 200°C, which can be directly discharged or directly supplied to the curing furnace. 6. The high-temperature flue gas in the curing furnace is only about 200°C, which can be directly discharged or directly supplied to the drying furnace. 7. Finally, the flue gas in the drying furnace is discharged directly or after being treated by the dust removal system.

It can be seen from the above embodiments that the waste heat comprehensive utilization system of the aluminum profile production line provided by the present invention can discharge the waste heat from the upstream furnace on the aluminum profile production line through the blower, valve, heat exchanger and other functional parts under the control of the monitoring system. The waste heat in the high-temperature flue gas is distributed to the downstream furnaces, and the waste heat of each furnace can be fully utilized by the downstream furnaces. According to calculations, the system can reduce the existing 250 cubic meters of gas required to produce per ton of aluminum profiles to only 130 cubic meters of gas per ton, saving energy by nearly 50%. Moreover, while reducing gas consumption, it also reduces the emission of various polluting gases. In addition, the system changes the high-temperature flue gas into low-temperature flue gas emission, which also reduces the cost of the flue gas dust removal system.

It should be understood that the application of the present invention is not limited to the above examples, and those skilled in the art can improve or transform according to the above description, for example, the casting furnace, aluminum ingot preheating chamber, homogenizing furnace in this system , aluminum rod heating furnace, aging furnace, curing furnace and drying furnace, the number of which can be more than two, and the corresponding flue gas conveying pipeline in the system is also set in a mesh structure, so the system can also be built into a waste heat comprehensive Use the net. In addition, the smoke exhaust pipe of the drying furnace can also be connected with a water tank, and a heat exchanger is arranged on the smoke exhaust pipe, and the waste heat of the flue gas discharged through the heat exchanger converter is used for hot water. All these improvements and changes should belong to the protection scope of the appended claims of the present invention.

Claims (6)

1. A system for comprehensive utilization of waste heat in an aluminum profile production line, characterized in that it includes a melting and casting furnace, an aluminum ingot preheating chamber, a homogenizing furnace, an aluminum rod heating furnace, an aging furnace, a curing furnace, a drying furnace, a smoke exhaust pipe, a delivery Smoke pipes, smoke pipes, smoke exhaust valves, smoke valves, safety valves, heat exchangers, blowers and smoke valves, in melting and casting furnaces, aluminum ingot preheating chambers, homogenizing furnaces, aluminum rod heating furnaces, aging furnaces, Smoke exhaust pipes are installed on the smoke outlets of the curing furnace and drying furnace; smoke delivery pipes are installed on the smoke inlets of the aluminum ingot preheating chamber, homogeneous furnace, aluminum rod heating furnace, aging furnace, curing furnace, and drying furnace. Smoke pipes; the smoke exhaust pipes of the melting and casting furnace, the homogenizing furnace and the aging furnace are adjacent to and connected with the respective smoke delivery pipes of the aluminum ingot preheating chamber, the aluminum rod heating furnace and the curing furnace, and the aluminum ingot preheating The smoke exhaust pipes of the chamber, the aluminum rod heating furnace and the curing furnace are adjacent to each other and the smoke delivery pipes of the homogenizing furnace, the aging furnace and the drying furnace, and the smoke exhaust pipes of the drying furnace are directly discharged outward; Smoke exhaust valves are installed at the smoke exhaust pipes of melting and casting furnaces, aluminum ingot preheating chambers, homogenizing furnaces, aluminum rod heating furnaces, aging furnaces, curing furnaces, and drying furnaces; Smoke valves and safety valves are provided on each smoke pipeline of the utilization system; the smoke pipelines of the aluminum ingot preheating chamber, homogeneous furnace, aluminum rod heating furnace, aging furnace, curing furnace, and drying furnace are equipped with A heat exchanger, a blower fan and a smoke supply valve are arranged, and the positions of the heat exchanger, the blower blower and the smoke supply valve are arranged in order of the heat exchanger, the blower fan and the smoke supply valve according to the air supply direction. 2. The waste heat comprehensive utilization system of the aluminum profile production line according to claim 1, further comprising a water tank, the exhaust pipe of the drying furnace is inserted into the water tank, and the smoke exhaust pipe of the drying furnace A heat exchanger is provided on it. 3. The waste heat comprehensive utilization system of aluminum profile production line according to claim 1 or 2, characterized in that the number of the melting and casting furnace is at least one, the number of the aluminum ingot preheating chamber is at least one, and the homogeneous There is at least one furnace, at least one aluminum rod heating furnace, at least one aging furnace, at least one curing furnace, and at least one drying furnace. 4. The waste heat comprehensive utilization system of an aluminum profile production line according to claim 1, further comprising a monitoring system, the monitoring system comprising a central processing unit, a data monitoring device and a control device, the data monitoring device and the control device It is arranged on each furnace body in the waste heat comprehensive utilization system of the aluminum profile production line, and the data monitoring device and the control device are respectively electrically connected with the central processing unit. 5. The system for comprehensive utilization of waste heat in an aluminum profile production line according to claim 4, wherein the data monitoring device includes a pressure monitor and a temperature monitor. 6. The waste heat comprehensive utilization system of aluminum profile production line according to claim 4 or 5, characterized in that the control device includes a smoke exhaust valve, a smoke delivery valve, a safety valve, a heat exchanger, a blower and a smoke supply valve.

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