Energy-saving bright annealing system and thermal cycle control method

Abstract

The invention provides an energy-saving bright annealing system and a thermal cycle control method. The energy-saving bright annealing system comprises a first bright annealing furnace, a second bright annealing furnace, an induced draft fan and a boiler, the first bright annealing furnace is provided with a first air vent, a second air vent and a first normal-temperature air inlet; the second bright annealing furnace is provided with a third ventilation opening, a fourth ventilation opening, a fifth ventilation opening and a second normal-temperature air inlet, the first ventilation opening and the fourth ventilation opening are communicated with an air inlet of the induced draft fan, valves are arranged at the communicated parts, the fifth ventilation opening and an air inlet of the boiler are communicated with an air outlet of the induced draft fan, and valves are arranged at the communicated parts; the second ventilation opening communicates with the third ventilation opening, and a valve is arranged at the communicating part. According to the energy-saving bright annealing system and the heat cycle control method, two bright annealing furnaces are used alternately, after one bright annealing furnace completes iron wire annealing and brightening, heat of the bright annealing furnace is transferred to the other bright annealing furnace through a control valve and an induced draft fan, the bright annealing furnace is heated on the basis of a certain temperature, and meanwhile, the heat cycle of the bright annealing furnace is controlled. Waste heat of the bright annealing furnace can be transmitted to the boiler, heat energy recovery is achieved, and the energy-saving effect is achieved.

Description

Technical Field

[0001] The invention mainly relates to the technical field of bright annealing furnaces, and in particular to an energy-saving bright annealing system and a thermal cycle control method. Background Art

[0002] Bell-type bright annealing furnace can be widely used for bright annealing of non-ferrous metal copper, aluminum alloy and ferrous metal, carbon steel, silicon steel, alloy steel and other coils, coils, wires, etc. Its principle is a heat treatment process in which the metal material is heated to an appropriate temperature, maintained for a certain period of time, and then slowly cooled.

[0003] Common annealing processes include: recrystallization annealing, stress relief annealing, spheroidizing annealing, full annealing, etc. The purpose of annealing is to reduce the hardness of metal materials, improve plasticity, facilitate cutting or pressure processing, reduce residual stress, improve the homogenization of organization and composition, or prepare the organization for subsequent heat treatment. The operating temperature of existing annealing furnaces is usually around 800 degrees, and cooling usually requires water channels for cooling. This heating and cooling process consumes a lot of energy. Summary of the invention

[0004] In view of the defects and shortcomings of the current technology, the embodiment of the present invention proposes an energy-saving bright annealing system that can effectively save energy. The technical solution is as follows: The present invention provides an energy-saving bright annealing system, comprising a first bright annealing furnace (1), a second bright annealing furnace (2), an induced draft fan (3) and a boiler (4); The first bright annealing furnace (1) has a first air vent (5), a second air vent (6) and a first normal temperature air inlet, and the first normal temperature air inlet has a valve; The second bright annealing furnace has a No. 3 air vent (7), a No. 4 air vent (8), a No. 5 air vent (9) and a second normal temperature air inlet, and the second normal temperature air inlet has a valve; The No. 1 vent (5) and the No. 4 vent (8) are respectively connected to the air inlet of the induced draft fan (3), and valves are respectively provided on the connecting parts; The No. 5 vent (9) and the air inlet of the boiler (4) are respectively connected to the air outlet of the induced draft fan (3), and valves are respectively provided at the connecting parts; The second vent (6) is connected to the third vent (7), and a valve is provided at the connecting portion.

[0005] As a preferred embodiment of the above technical solution, the No. 1 vent (5) is located at the upper end of the first bright annealing furnace (1) so as to be connected to the upper end of the inner cavity of the first bright annealing furnace, and the No. 2 vent (6) is located at the lower end of the first bright annealing furnace (1) so as to be connected to the bottom of the inner cavity of the first bright annealing furnace (1).

[0006] As a preferred embodiment of the above technical solution, the No. 3 vent (7) and the No. 4 vent (8) are located at the upper end of the second bright annealing furnace (2) so as to be connected to the upper end of the inner cavity of the second bright annealing furnace (2), and the No. 5 vent (9) is located at the lower end of the second bright annealing furnace (2) so as to be connected to the bottom of the inner cavity of the second bright annealing furnace (2).

[0007] As a preferred embodiment of the above technical solution, the valve and the induced draft fan (3) are respectively connected to a controller to respectively control their opening / closing.

[0008] As a preferred embodiment of the above technical solution, the bright annealing furnace is a full hydrogen hood type bright annealing furnace.

[0009] A thermal cycle control method for an energy-saving bright annealing system comprises the following steps: 1) When the first bright annealing furnace (1) is heated, the valve is controlled to close the first vent (5) and the second vent (6), and when the temperature of the first bright annealing furnace (1) reaches the rated temperature, the heating and power supply are stopped; 2) Control the valve to close the No. 4 vent (8) and the air inlet of the boiler (4), and control the induced draft fan (3) to open. At this time, the heat in the first bright annealing furnace (1) passes through the No. 1 vent (5), the induced draft fan (3), the No. 5 vent (9), the second bright annealing furnace (2), the No. 3 vent (7), and the No. 2 vent (6) and then returns to the first bright annealing furnace (1), thereby forming a closed circulation space to transfer the heat energy of the first bright annealing furnace (1) to the second bright annealing furnace (2). When the temperature of the first bright annealing furnace (1) is equal to that of the second bright annealing furnace (2), the induced draft fan (3) is temporarily stopped. The equal temperature is 300-350 degrees. 3) Control the valves to close the space between the No. 2 vent (6) and the No. 3 vent (7), the space between the No. 5 vent (9) and the exhaust port of the induced draft fan (3), and the space between the No. 4 vent (8) and the exhaust port of the induced draft fan (3). At this time, the second bright annealing furnace (2) is controlled to start heating and raising the temperature at 300-350 degrees; 4) Control the valve to make the air outlet of the induced draft fan (3) and the air inlet of the boiler (4) conductive, and at the same time control the induced draft fan (3) and the first normal temperature air inlet valve to open, at this time, the normal temperature air entering the first bright annealing furnace (1) from the first normal temperature air inlet enters the induced draft fan (3) through the first air vent (5), and then transmits the residual heat to the boiler (4) through its air outlet, while cooling the first bright annealing furnace (1) and transferring the residual heat to the boiler (4) through the induced draft fan (3), so that the boiler (4) is heated to produce 100 degrees boiling water based on the residual heat temperature; 5) When the second bright annealing furnace (2) reaches the rated temperature, the electric furnace is stopped from heating up and power is supplied, and the valve is controlled to connect the No. 2 vent (6) with the No. 3 vent (7), connect the No. 1 vent (5) with the inlet of the induced draft fan (3), connect the air outlet of the induced draft fan (3) with the No. 5 vent (9), close the No. 4 vent (8), and close the air inlet of the boiler (4). At this time, a closed circulation space is formed between the second bright annealing furnace (2) and the first bright annealing furnace (1). The induced draft fan (3) is controlled to open to transfer the heat energy of the second bright annealing furnace (2) to the first bright annealing furnace (1). When the temperature of the second bright annealing furnace (2) is equal to that of the first bright annealing furnace (1), the induced draft fan is temporarily stopped. The equal temperature is 300-350 degrees. 6) Control the valves to seal the space between the No. 2 vent (6) and the No. 3 vent (7), the space between the No. 1 vent (5) and the air inlet of the induced draft fan (3), and the space between the air outlet of the induced draft fan (3) and the No. 5 vent (9), and start heating the first bright annealing furnace at 300-350 degrees; 7) Control the valve to connect the No. 4 vent (8) to the air inlet of the induced draft fan (3), connect the air outlet of the induced draft fan (3) to the air inlet of the boiler (4), and open the valves of the induced draft fan (3) and the second normal temperature air inlet. At this time, the normal temperature air entering the second bright annealing furnace (2) from the second normal temperature air inlet begins to cool the second bright annealing furnace (2). At the same time, the residual heat is transferred to the boiler (4) through the induced draft fan (3), so that the boiler (4) is heated to produce 100-degree boiling water based on the residual heat temperature.

[0010] The present invention proposes an energy-saving bright annealing system which can effectively save energy. Two bright annealing furnaces are used alternately. After one bright annealing furnace completes the annealing and brightening of the iron wire, the heat of the bright annealing furnace is transferred to the other bright annealing furnace by controlling a valve and an induced draft fan, so that the temperature is increased on the basis of a certain temperature. At the same time, the waste heat of the bright annealing furnace can be transferred to the boiler to realize heat energy recovery and achieve energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0012] Figure 1 It is a schematic plan view of an energy-saving bright annealing system provided in an embodiment of the present invention; Figure 2 Schematic diagram of the structure of an energy-saving bright annealing system provided in an embodiment of the present invention; Figure 3 yes Figure 2 Rear view of Figure 4 yes Figure 2 Stereoscopic image of Figure 5 yes Figure 2 The other side stereogram. DETAILED DESCRIPTION

[0013] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0014] The present invention provides an energy-saving bright annealing system, comprising a first bright annealing furnace 1, a second bright annealing furnace 2, an induced draft fan 3 and a boiler 4; The first bright annealing furnace 1 has a first air vent 5, a second air vent 6 and a first normal temperature air inlet, and the first normal temperature air inlet has a valve; The second bright annealing furnace has a third vent 7, a fourth vent 8, a fifth vent (9 and a second normal temperature air inlet, and the second normal temperature air inlet has a valve; The first vent 5 and the fourth vent 8 are respectively connected to the air inlet of the induced draft fan 3, and the connecting parts are respectively provided with valves; The No. 5 vent 9 and the boiler air inlet 10 are respectively connected to the air outlet of the induced draft fan 3 and valves are provided at the connecting parts; The second vent 6 is connected to the third vent 7 and a valve is provided at the connecting part.

[0015] The first vent 5 is located at the upper end of the first bright annealing furnace 1 to communicate with the upper end of the inner cavity of the first bright annealing furnace, and the second vent 6 is located at the lower end of the first bright annealing furnace 1 to communicate with the bottom of the inner cavity of the first bright annealing furnace 1.

[0016] The third and fourth vents 7 and 8 are located at the upper end of the second bright annealing furnace 2 to communicate with the upper end of the inner cavity of the second bright annealing furnace 2 , and the fifth vent 9 is located at the lower end of the second bright annealing furnace 2 to communicate with the bottom of the inner cavity of the second bright annealing furnace 2 .

[0017] The valve and the induced draft fan 3 are respectively connected to controllers to control their opening / closing respectively.

[0018] The bright annealing furnace is a full hydrogen hood type bright annealing furnace.

[0019] A thermal cycle control method for an energy-saving bright annealing system comprises the following steps: 1) When the first bright annealing furnace 1 is heated, the valve is controlled to close the No. 1 vent 5 and the No. 2 vent 6, and the heating and power supply are stopped when the temperature of the first bright annealing furnace 1 reaches the rated temperature; 2) Control the valve to close the No. 4 vent 8 and the air inlet of the boiler 4, and control the induced draft fan 3 to open. At this time, the heat in the first bright annealing furnace 1 passes through the No. 1 vent 5, the induced draft fan 3, the No. 5 vent 9, the second bright annealing furnace 2, the No. 3 vent 7, and the No. 2 vent 6 and then returns to the first bright annealing furnace 1, thereby forming a closed circulation space to transfer the heat energy of the first bright annealing furnace 1 to the second bright annealing furnace 2. When the temperature of the first bright annealing furnace 1 is equal to that of the second bright annealing furnace 2, temporarily stop the operation of the induced draft fan 3, and the equal temperature is 300-350 degrees, achieving energy saving of more than 40%; 3) Control the valves to close the space between the second vent 6 and the third vent 7, the space between the fifth vent 9 and the exhaust port of the induced draft fan 3, and the space between the fourth vent 8 and the exhaust port of the induced draft fan 3. At this time, control the second bright annealing furnace 2 to start heating and heating at 300-350 degrees; 4) Control the valve to make the air outlet of the induced draft fan 3 and the air inlet of the boiler 4 conductive, and at the same time control the induced draft fan 3 and the first normal temperature air inlet valve to open. At this time, the normal temperature air entering the first bright annealing furnace 1 from the first normal temperature air inlet enters the induced draft fan 3 through the first vent 5 and then transmits the waste heat to the boiler 4 through its air outlet. While cooling the first bright annealing furnace 1, the waste heat is transferred to the boiler 4 through the induced draft fan 3 so that it is heated to produce 100 degrees boiling water based on the waste heat temperature, realizing heat energy recovery of more than 50%; 5) When the second bright annealing furnace 2 reaches the rated temperature of 750 degrees, the electric furnace heating power supply is stopped, and the valve is controlled to connect the No. 2 vent 6 with the No. 3 vent 7, the No. 1 vent 5 with the inlet of the induced draft fan 3, the outlet of the induced draft fan 3 with the No. 5 vent 9, the No. 4 vent 8 is closed, and the air inlet of the boiler 4 is closed. At this time, a closed circulation space 1 is formed between the second bright annealing furnace 2 and the first bright annealing furnace, and the induced draft fan 3 is controlled to open to transfer the heat energy of the second bright annealing furnace 2 to the first bright annealing furnace 1. When the temperature of the second bright annealing furnace 2 is equal to that of the first bright annealing furnace 1, the induced draft fan is temporarily stopped. The equal temperature is 300-350 degrees, achieving energy saving of more than 40%; 6) Control the valves to close the space between the No. 2 vent 6 and the No. 3 vent 7, the space between the No. 1 vent 5 and the air inlet of the induced draft fan 3, and the space between the air outlet of the induced draft fan 3 and the No. 5 vent 9. The first bright annealing furnace starts heating at 300-350 degrees. 7) Control the valve to connect the No. 4 vent 8 with the air inlet of the induced draft fan 3, and connect the air outlet of the induced draft fan 3 with the air inlet of the boiler 4. The induced draft fan 3 and the valve of the second normal temperature air inlet are opened. At this time, the normal temperature air entering the second bright annealing furnace 2 from the second normal temperature air inlet begins to cool the second bright annealing furnace 2. At the same time, the waste heat is transferred to the boiler 4 through the induced draft fan 3 so that it is heated to produce 100-degree boiling water based on the waste heat temperature, realizing more than 50% heat energy recovery.

[0020] The present invention proposes an energy-saving bright annealing system which can effectively save energy. Two bright annealing furnaces are used alternately. After one bright annealing furnace completes the annealing and brightening of the iron wire, the heat of the bright annealing furnace is transferred to the other bright annealing furnace by controlling a valve and an induced draft fan, so that the temperature is increased on the basis of a certain temperature. At the same time, the waste heat of the bright annealing furnace can be transferred to the boiler to realize heat energy recovery and achieve energy-saving effect.

[0021] The technical solution of the present invention is described rather than limited thereto; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents; and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An energy-saving bright annealing system, It is characterized in that It comprises a first bright annealing furnace (1), a second bright annealing furnace (2), an induced draft fan (3) and a boiler (4); The first bright annealing furnace (1) has a first air vent (5), a second air vent (6) and a first normal temperature air inlet, and the first normal temperature air inlet has a valve; The second bright annealing furnace has a No. 3 air vent (7), a No. 4 air vent (8), a No. 5 air vent (9) and a second normal temperature air inlet, and the second normal temperature air inlet has a valve; The No. 1 vent (5) and the No. 4 vent (8) are respectively connected to the air inlet of the induced draft fan (3), and valves are respectively provided on the connecting parts; The No. 5 vent (9) and the air inlet of the boiler (4) are respectively connected to the air outlet of the induced draft fan (3), and valves are respectively provided at the connecting parts; The second vent (6) is connected to the third vent (7), and a valve is provided at the connecting portion.

2. The energy-saving bright annealing system according to claim 1, It is characterized in that The first vent (5) is located at the upper end of the first bright annealing furnace (1) so as to be in communication with the upper end of the inner cavity of the first bright annealing furnace, and the second vent (6) is located at the lower end of the first bright annealing furnace (1) so as to be in communication with the bottom of the inner cavity of the first bright annealing furnace (1).

3. The energy-saving bright annealing system according to claim 2, It is characterized in that The third vent (7) and the fourth vent (8) are located at the upper end of the second bright annealing furnace (2) so as to be in communication with the upper end of the inner cavity of the second bright annealing furnace (2), and the fifth vent (9) is located at the lower end of the second bright annealing furnace (2) so as to be in communication with the bottom of the inner cavity of the second bright annealing furnace (2).

4. The energy-saving bright annealing system according to claim 1, It is characterized in that The valve and the induced draft fan (3) are respectively connected to a controller to control their opening / closing respectively.

5. The energy-saving bright annealing system according to claim 1, It is characterized in that The bright annealing furnace is a full hydrogen hood type bright annealing furnace.

6. A thermal cycle control method for an energy-saving bright annealing system according to any one of claims 1 to 5, It is characterized in that The steps include: 1) When the first bright annealing furnace (1) is heated, the valve is controlled to close the first vent (5) and the second vent (6), and when the temperature of the first bright annealing furnace (1) reaches the rated temperature, the heating and power supply are stopped; 2) Control the valve to close the No. 4 vent (8) and the air inlet of the boiler (4), and control the induced draft fan (3) to open. At this time, the first bright annealing furnace (1) and the second bright annealing furnace (2) form a closed circulation space to transfer the heat energy of the first bright annealing furnace (1) to the second bright annealing furnace (2). When the temperature of the first bright annealing furnace (1) is equal to that of the second bright annealing furnace (2), temporarily stop the operation of the induced draft fan (3). The equal temperature is 300-350 degrees. 3) Control the valves to close the space between the No. 2 vent (6) and the No. 3 vent (7), the space between the No. 5 vent (9) and the exhaust port of the induced draft fan (3), and the space between the No. 4 vent (8) and the exhaust port of the induced draft fan (3). At this time, the second bright annealing furnace (2) is controlled to start heating and raising the temperature at 300-350 degrees; 4) Control the valve to make the air outlet of the induced draft fan (3) and the air inlet of the boiler (4) conductive, and at the same time control the induced draft fan (3) and the first normal temperature air inlet valve to open, at this time, the normal temperature air entering the first bright annealing furnace (1) from the first normal temperature air inlet enters the induced draft fan (3) through the first air vent (5), and then transmits the residual heat to the boiler (4) through its air outlet, while cooling the first bright annealing furnace (1) and transferring the residual heat to the boiler (4) through the induced draft fan (3), so that the boiler (4) is heated to produce 100 degrees boiling water based on the residual heat temperature; 5) When the second bright annealing furnace (2) reaches the rated temperature, the electric furnace is stopped from heating up and power is supplied, and the valve is controlled to connect the No. 2 vent (6) with the No. 3 vent (7), connect the No. 1 vent (5) with the inlet of the induced draft fan (3), connect the air outlet of the induced draft fan (3) with the No. 5 vent (9), close the No. 4 vent (8), and close the air inlet of the boiler (4). At this time, a closed circulation space is formed between the second bright annealing furnace (2) and the first bright annealing furnace (1). The induced draft fan (3) is controlled to open to transfer the heat energy of the second bright annealing furnace (2) to the first bright annealing furnace (1). When the temperature of the second bright annealing furnace (2) is equal to that of the first bright annealing furnace (1), the induced draft fan is temporarily stopped. The equal temperature is 300-350 degrees. 6) Control the valves to seal the space between the No. 2 vent (6) and the No. 3 vent (7), the space between the No. 1 vent (5) and the air inlet of the induced draft fan (3), and the space between the air outlet of the induced draft fan (3) and the No. 5 vent (9), and start heating the first bright annealing furnace at 300-350 degrees; 7) Control the valve to connect the No. 4 vent (8) to the air inlet of the induced draft fan (3), connect the air outlet of the induced draft fan (3) to the air inlet of the boiler (4), and open the valves of the induced draft fan (3) and the second normal temperature air inlet. At this time, the normal temperature air entering the second bright annealing furnace (2) from the second normal temperature air inlet begins to cool the second bright annealing furnace (2). At the same time, the residual heat is transferred to the boiler (4) through the induced draft fan (3), so that the boiler (4) is heated to produce 100-degree boiling water based on the residual heat temperature.

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