Cold rolling continuous annealing rapid cooling section air injection cooling device

Abstract

The utility model discloses a cold rolling continuous annealing rapid cooling section air injection cooling device, and belongs to the technical field of cold rolling equipment.The cold rolling continuous annealing rapid cooling section air injection cooling device comprises a cooling system, an air duct, a circulating fan and a cooling assembly, and the cooling system comprises a low-boiling-point organic matter connecting channel, a condenser, a working medium circulating pump and an evaporator; the condenser and the evaporator are connected to the low-boiling-point organic matter connecting channel in a spaced mode, the working medium circulating pump is installed in the low-boiling-point organic matter connecting channel, the circulating fan is installed in the air channel, and the cooling assembly is connected into the air channel. The high-temperature nitrogen-hydrogen protective gas enters the evaporator to heat the organic working medium, so that the organic working medium is changed into gaseous steam from the liquid state, the temperature of the nitrogen-hydrogen protective gas is reduced, the expanded organic steam is cooled in the condenser and changed into the liquid state again, and the nitrogen-hydrogen protective gas can be continuously cooled by the cooling system, so that rapid cooling of the strip steel is facilitated.

Description

Technical Field

[0001] This application relates to the technical field of cold rolling equipment, and in particular discloses a jet cooling device for the rapid cooling section of continuous annealing in cold rolling. Background Technology

[0002] During the continuous annealing process, strip steel undergoes heating, soaking, slow cooling, rapid cooling, and aging processes in the heating furnace. Among these, the cooling capacity of the rapid cooling section of the annealing furnace has a significant impact on the mechanical properties of the product, and rapid cooling efficiency represents the production level of advanced high-strength steel.

[0003] Currently, the rapid cooling section generally adopts jet cooling technology, which uses a water-cooled high-concentration nitrogen-hydrogen protective gas to rapidly cool the strip by spraying a high-speed airflow, which can protect the strip from oxidation and improve surface quality.

[0004] In view of the above-mentioned prior art, the inventors discovered that after the strip steel is cooled by nitrogen-hydrogen protective gas for a long time, the temperature of the existing cooling water rises, which reduces the cooling effect of nitrogen-hydrogen protective gas on the strip steel and is not conducive to the rapid cooling of the strip steel. Utility Model Content

[0005] To facilitate rapid cooling of strip steel, this application provides a jet cooling device for the rapid cooling section of cold rolling continuous annealing.

[0006] This application provides a jet cooling device for a rapid cooling section in a continuous cold rolling annealing process, which adopts the following technical solution:

[0007] A jet cooling device for a rapid cooling section in continuous cold rolling annealing includes a cooling system, an air duct, a circulating fan, and a cooling assembly. The cooling system is used to cool the nitrogen-hydrogen protective gas in the air duct. The cooling system includes a low-boiling-point organic matter connecting channel, a condenser, a working fluid circulating pump, and an evaporator. The condenser and evaporator are connected intermittently to the low-boiling-point organic matter connecting channel. The working fluid circulating pump is installed inside the low-boiling-point organic matter connecting channel. The circulating fan is installed inside the air duct. The cooling assembly is connected inside the air duct and is used to spray out the cooled nitrogen-hydrogen protective gas.

[0008] By adopting the above technical solution, the high-temperature nitrogen-hydrogen protective gas enters the evaporator, heats the organic working fluid, and turns it from a liquid state into a gaseous vapor state, thereby reducing the temperature of the nitrogen-hydrogen protective gas. The expanded organic vapor is cooled in the condenser and turns back into a liquid state. The cooling system can continuously cool the nitrogen-hydrogen protective gas, which is conducive to the rapid cooling of the strip steel.

[0009] Optionally, it also includes a generator and a turbine connected between the condenser and the evaporator.

[0010] By adopting the above technical solution, the generator and turbine are configured to form an organic Rankine cycle system in the cooling system. High-temperature organic steam enters the turbine and drives the generator to generate electricity, thus converting the heat energy dissipated from the strip into electrical energy and improving the energy utilization rate.

[0011] Optionally, the cooling assembly includes an annealing furnace and a cooling air box. The annealing furnace is provided with an air inlet and an air outlet. The air outlet of the annealing furnace is connected to an air duct. The cooling air box has an air inlet channel fixed at the end away from the strip. The air inlet channel is installed at the air inlet of the annealing furnace and is connected to the air duct. A nozzle is installed at the end of the cooling air box near the strip.

[0012] By adopting the above technical solution, the nitrogen-hydrogen protective gas cooled by the cooling system enters the cooling air box through the air inlet channel. The nitrogen-hydrogen protective gas is blown onto the strip steel through the air nozzle to cool the strip steel. The high-temperature nitrogen-hydrogen protective gas emitted from the strip steel is located in the annealing furnace. The high-temperature nitrogen-hydrogen protective gas in the annealing furnace returns to the air duct through the air outlet, which facilitates the recooling of the nitrogen-hydrogen protective gas.

[0013] Optionally, two cooling air boxes are provided, and the two cooling air boxes are symmetrically arranged on both sides of the strip.

[0014] By adopting the above technical solution, the nitrogen-hydrogen protective gas in the cooling box can cool both sides of the strip steel, improving the uniformity of the nitrogen-hydrogen protective gas cooling the strip steel.

[0015] Optionally, multiple nozzles are provided, and the multiple nozzles are evenly distributed on the side of the cooling box.

[0016] By adopting the above technical solution, multiple nozzles are evenly arranged, which makes the airflow of nitrogen-hydrogen protective gas more evenly cover the surface of the strip steel, thereby improving the uniformity of the cooling of the strip steel by the nitrogen-hydrogen protective gas.

[0017] Optionally, the nozzle is configured as a slit nozzle.

[0018] By adopting the above technical solution, the slit nozzle has a simple structure, a wide range of applications, and uniform spraying, which facilitates the uniform spraying of nitrogen and hydrogen protective gases.

[0019] In summary, this application includes at least one of the following beneficial technical effects:

[0020] 1. High-temperature nitrogen-hydrogen protective gas enters the evaporator, heats the organic working fluid, and turns it from liquid to gaseous vapor, which lowers the temperature of the nitrogen-hydrogen protective gas. The expanded organic vapor is cooled in the condenser and turns back into liquid. The cooling system can continuously cool the nitrogen-hydrogen protective gas, which is conducive to the rapid cooling of the strip.

[0021] 2. The setup of the generator and turbine enables the cooling system to form an organic Rankine cycle system. High-temperature organic steam entering the turbine can drive the generator to generate electricity, thus converting the heat energy dissipated from the strip into electrical energy and improving energy utilization.

[0022] 3. The nitrogen-hydrogen protective gas cooled by the cooling system enters the cooling air box through the air inlet channel. The nitrogen-hydrogen protective gas is blown onto the strip steel through the air nozzle to cool the strip steel. The high-temperature nitrogen-hydrogen protective gas emitted from the strip steel is located in the annealing furnace. The high-temperature nitrogen-hydrogen protective gas in the annealing furnace returns to the air duct through the air outlet to facilitate the recooling of the nitrogen-hydrogen protective gas. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this application.

[0024] Figure 2 This is a schematic diagram of the cooling component of this application.

[0025] Explanation of reference numerals in the attached drawings: 1. Condenser; 2. Working fluid circulation pump; 3. Evaporator; 4. Circulating fan; 5. Air duct; 6. Annealing furnace; 61. Air inlet; 62. Air outlet; 7. Strip steel; 8. Cooling air box; 81. Air inlet channel; 82. Nozzle; 9. Generator; 10. Turbine. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0027] This application discloses a jet cooling device for the rapid cooling section of a cold-rolled continuous annealing process. (Refer to...) Figure 1 A jet cooling device for a rapid cooling section in a continuous annealing process for cold rolling includes a cooling system, an air duct 5, a circulating fan 4, and a cooling assembly. The cooling system is used to cool the nitrogen-hydrogen protective gas in the air duct 5. The circulating fan 4 is installed inside the air duct 5 and is used to move the nitrogen-hydrogen protective gas within the air duct 5. The cooling assembly is connected inside the air duct 5 and is used to spray out the cooled nitrogen-hydrogen protective gas.

[0028] Reference Figure 1 The cooling system includes a low-boiling-point organic matter connection channel, a condenser 1, a working fluid circulation pump 2, an evaporator 3, a generator 9, and a turbine 10. The condenser 1 and evaporator 3 are connected at intervals along the low-boiling-point organic matter connection channel. The working fluid circulation pump 2 is located between the condenser 1 and the evaporator 3, and is installed within the low-boiling-point organic matter connection channel. The generator 9 and turbine 10 are located between the condenser 1 and the evaporator 3, and are connected to the side of the low-boiling-point organic matter connection channel opposite to the working fluid circulation pump 2.

[0029] Reference Figure 1An organic Rankine cycle system is constructed by a low-boiling-point organic material connecting channel, condenser 1, working fluid circulation pump 2, evaporator 3, generator 9, and turbine 10. High-temperature nitrogen-hydrogen protective gas enters evaporator 3, heating the organic working fluid and causing it to change from a liquid to a gaseous vapor. This lowers the temperature of the nitrogen-hydrogen protective gas. The expanded organic vapor is then cooled in condenser 1, returning to a liquid state. The cooling system continuously cools the nitrogen-hydrogen protective gas, thus facilitating the rapid cooling of the strip steel 7. Simultaneously, the high-temperature organic vapor enters turbine 10, driving generator 9 to generate electricity, converting the heat energy dissipated from the strip steel 7 into electrical energy and improving energy utilization efficiency.

[0030] Reference Figure 1 and Figure 2 The cooling assembly includes an annealing furnace 6 and cooling air boxes 8. An air inlet 61 and an air outlet 62 are respectively opened on both sides of the back of the annealing furnace 6. The air outlet 62 of the annealing furnace 6 is connected to the air duct 5. Two cooling air boxes 8 are provided, located inside the annealing furnace 6, and symmetrically distributed on both sides of the strip 7. An air inlet channel 81 is fixed to the end of the cooling air box 8 facing away from the strip 7. The air inlet channel 81 is installed at the air inlet 61 of the annealing furnace 6 and is connected to the air duct 5. Multiple evenly distributed nozzles 82 are installed on the side of the cooling air box 8 near the strip 7. The nozzles 82 are slit nozzles 82. Slit nozzles 82 have a simple structure, wide application range, uniform spray, and facilitate uniform spraying of nitrogen-hydrogen protective gas.

[0031] Reference Figure 1 and Figure 2 The nitrogen-hydrogen protective gas, cooled by the cooling system, enters the cooling air box 8 through the air inlet channel 81. The nitrogen-hydrogen protective gas is then blown onto the strip steel 7 through the air nozzle to cool the strip steel 7. The high-temperature nitrogen-hydrogen protective gas dissipating from the strip steel 7 is located inside the annealing furnace 6. The high-temperature nitrogen-hydrogen protective gas inside the annealing furnace 6 returns to the air duct 5 through the air outlet 62, facilitating the recooling of the nitrogen-hydrogen protective gas.

[0032] The implementation principle of the jet cooling device for the rapid cooling section of continuous annealing in this application embodiment is as follows: The nitrogen-hydrogen protective gas cooled by the cooling system enters the cooling air box 8 through the air inlet channel 81. The nitrogen-hydrogen protective gas is blown onto the strip steel 7 through the nozzle, achieving cooling of the strip steel 7. The high-temperature nitrogen-hydrogen protective gas dissipating from the strip steel 7 is located inside the annealing furnace 6. The high-temperature nitrogen-hydrogen protective gas inside the annealing furnace 6 returns to the air duct 5 through the air outlet 62. The high-temperature nitrogen-hydrogen protective gas returning to the air duct 5 enters the evaporator 3 through the circulating fan 4. The high-temperature nitrogen-hydrogen protective gas entering the evaporator 3 heats the organic working fluid, causing it to change from a liquid state to a gaseous vapor state, thus lowering the temperature of the nitrogen-hydrogen protective gas. The expanded organic vapor is cooled in the condenser 1 and returns to a liquid state. This allows the cooling system to continuously cool the nitrogen-hydrogen protective gas. Simultaneously, the high-temperature organic vapor entering the turbine 10 can drive the generator 9 to generate electricity, converting the heat energy dissipated from the strip steel 7 into electrical energy, improving energy utilization efficiency.

[0033] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A jet cooling device for a rapid cooling section of a continuous annealing process for cold rolling, characterized in that: The system includes a cooling system, an air duct (5), a circulating fan (4), and a cooling assembly. The cooling system is used to cool the nitrogen-hydrogen protective gas in the air duct (5). The cooling system includes a low-boiling-point organic matter connection channel, a condenser (1), a working fluid circulation pump (2), and an evaporator (3). The condenser (1) and the evaporator (3) are connected at intervals on the low-boiling-point organic matter connection channel. The working fluid circulation pump (2) is installed in the low-boiling-point organic matter connection channel. The circulating fan (4) is installed in the air duct (5). The cooling assembly is connected in the air duct (5) and is used to spray out the cooled nitrogen-hydrogen protective gas.

2. The jet cooling device for the rapid cooling section of continuous cold rolling annealing according to claim 1, characterized in that: It also includes a generator (9) and a turbine (10), which are connected between the condenser (1) and the evaporator (3).

3. The jet cooling device for the rapid cooling section of continuous cold rolling annealing according to claim 1, characterized in that: The cooling assembly includes an annealing furnace (6) and a cooling air box (8). The annealing furnace (6) is provided with an air inlet (61) and an air outlet (62). The air outlet (62) of the annealing furnace (6) is connected to the air duct (5). The cooling air box (8) has an air inlet channel (81) fixed at the end away from the strip (7). The air inlet channel (81) is installed at the air inlet (61) of the annealing furnace (6) and is connected to the air duct (5). The cooling air box (8) has a nozzle (82) installed at the end near the strip (7).

4. The jet cooling device for the rapid cooling section of continuous cold rolling annealing according to claim 3, characterized in that: There are two cooling air boxes (8), which are symmetrically arranged on both sides of the strip (7).

5. The jet cooling device for the rapid cooling section of continuous cold rolling annealing according to claim 3, characterized in that: The nozzles (82) are provided in multiple ways, and the multiple nozzles (82) are evenly distributed on the side of the cooling air box (8).

6. The jet cooling device for the rapid cooling section of continuous cold rolling annealing according to claim 3, characterized in that: The nozzle (82) is configured as a slit nozzle.

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