A secondary cooling steam descaling device for continuous casting

Abstract

The present invention discloses a secondary cooling steam descaling device for continuous casting, including a water supply pipe assembly, and a plurality of high-pressure nozzles connected to the water supply pipe assembly; the high-pressure nozzle is installed on the inner wall of the steam discharge pipe of the continuous casting workshop, and the inner bottom of the steam discharge pipe is provided with a drain connected to the water circulation system; the high-temperature steam in the continuous casting workshop is sucked into the steam discharge pipe, and condenses in contact with the water sprayed from the high-pressure nozzle, and the two condense into water droplets, which flow along the inner wall of the steam discharge pipe to the water outlet and enter the water circulation system. The beneficial effects of the present invention are: the device of the present invention improves the descaling effect and efficiency; the equipment is simple and reasonable, and does not require large-scale condensing equipment, heating equipment and other energy sources, reducing the investment cost and operating cost of the equipment; the device is installed on the steam discharge pipe and is easy to operate.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy, and in particular to a secondary cooling steam descaling device for continuous casting. Background Art

[0002] In the continuous casting process of the steel production process, a large amount of water vapor is generated when the ingot is cooled in the secondary cooling chamber, and it is generally discharged directly to the outside through the air duct by a fan; the discharged steam releases heat when it is cooled to produce water vapor, which cannot be completely absorbed by the atmosphere and will drop below the dew point to produce condensed water, forming a "white fog" phenomenon. The white fog floats on the roof and surrounding walls of the factory building. Long-term operation causes corrosion of the colored tiles on the roof and walls, and the direct emission of white fog has a certain impact on the surrounding living environment and the company's image. Therefore, the elimination or weakening of white fog through technical methods, avoiding direct discharge from high altitudes, and reducing pollution to surrounding structures not only meets the environmental protection requirements of energy conservation and emission reduction, but also improves the appearance of the company.

[0003] At present, the secondary cooling steam condensation device is often used on the roof of the factory to control the white fog. The secondary cooling steam condensation device uses a condenser to cool the discharged steam. During the cooling process, the moisture content of the steam decreases along the saturated humidity curve, condenses into water, and then is discharged. However, when the steam air volume is large, the investment cost and operating cost of this solution are high, and there are not many cases in actual application. Therefore, enterprises are in urgent need of technology that can effectively eliminate white fog. Summary of the invention

[0004] The object of the present invention is to provide a secondary cooling steam descaling device for continuous casting with high efficiency and low cost in view of the shortcomings of the prior art.

[0005] The technical solution adopted by the present invention is: a secondary cooling steam descaling device for continuous casting, including a water supply pipe assembly, and a plurality of high-pressure nozzles connected to the water supply pipe assembly; the high-pressure nozzles are installed on the inner wall of the steam discharge pipe in the continuous casting workshop, and the inner bottom of the steam discharge pipe is provided with a drain outlet connected to the water circulation system; the high-temperature steam in the continuous casting workshop is sucked into the steam discharge pipe, and condenses in contact with the water sprayed from the high-pressure nozzles. After the two are condensed into water droplets, they flow along the inner wall of the steam discharge pipe to the water outlet and enter the water circulation system.

[0006] According to the above scheme, the water supply pipe assembly includes a water inlet main pipe connected to the water supply equipment, and a water inlet branch pipe used to connect the water inlet main pipe and the high-pressure nozzle; the water inlet branch pipe passes through the mounting hole opened on the steam exhaust main pipe and is inserted into the supporting steel pipe to be connected to the high-pressure nozzle; the gap between the steam exhaust main pipe and the water inlet branch pipe is sealed with a filler.

[0007] According to the above scheme, the cross-section of the steam exhaust main pipe is square, and the water inlet main pipes are evenly distributed on the four side plates of the steam exhaust main pipe. Each water inlet main pipe is provided with a plurality of water inlet branches corresponding to the high-pressure nozzles, and the high-pressure nozzles are arranged at intervals along the circumference of the four side plates of the steam exhaust main pipe.

[0008] According to the above scheme, the steam exhaust main pipe is located at the same installation height relative to the high-pressure nozzles on the two side plates.

[0009] According to the above scheme, the supporting steel pipe used for installing the high-pressure nozzle is tilted downward, and the angle between the supporting steel pipe and the horizontal line is 10° to 20°.

[0010] According to the above scheme, the cross-section of the steam exhaust main pipe is rectangular, and a water inlet main pipe is installed on the outer walls of the two long side panels of the steam exhaust main pipe. Each water inlet pipe is installed with multiple water inlet branches corresponding to the high-pressure nozzles; the high-pressure nozzles are distributed at intervals along the length direction of the two long side panels.

[0011] According to the above scheme, the high-pressure nozzles on the two long side plates of the steam exhaust main pipe are located at different installation heights.

[0012] According to the above scheme, the supporting steel pipe used to install the high-pressure nozzle is tilted downward, and the angle between the steel pipe and the horizontal line is 25° to 35°.

[0013] The beneficial effects of the present invention are as follows: the device of the present invention utilizes a high-pressure nozzle to spray water droplets into the steam exhaust pipe of the continuous casting workshop, and the sprayed water droplets cool the upwardly moving steam, and at the same time provide a nucleating agent for the condensation of the water vapor, so that the water vapor condenses more into water droplets with larger diameters, thereby improving the de-whitening effect and efficiency; the device of the present invention is simple and reasonable, and does not require large-scale condensing equipment, heating equipment and other energy sources, thereby reducing the investment cost and operating cost of the equipment; the device is installed on the steam exhaust pipe and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of embodiment 1 of the present invention.

[0015] Figure 2 for Figure 1 AA section view.

[0016] Figure 3 This is a schematic diagram of the structure of the second embodiment of the present invention.

[0017] Figure 4 for Figure 3 BB cross-sectional view.

[0018] Among them: 1. Water inlet main pipe; 2. Water inlet branch pipe; 3. High-pressure nozzle; 4. Support steel pipe; 5. Filler; 6. Steam discharge main pipe; 7. Water outlet. DETAILED DESCRIPTION

[0019] In order to better understand the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] A large amount of water vapor is generated when cooling the cast ingot in the second cooling room of the continuous casting workshop, and is usually discharged directly to the outside through the steam exhaust pipe 6 by the fan. The steam exhaust pipe 6 of the continuous casting workshop is arranged above the continuous casting workshop, one end of which is connected to the inside of the continuous casting workshop, and the other end is connected to the inlet of the fan.

[0021] like Figure 1 and Figure 3 As shown, a secondary cooling steam descaling device for continuous casting includes a water supply pipe assembly, and a plurality of high-pressure nozzles 3 connected to the water supply pipe assembly; the high-pressure nozzles 3 are installed on the inner wall of the steam discharge pipe 6 of the continuous casting workshop, and the inner bottom of the steam discharge pipe 6 is provided with a drainage port connected to the drainage system; when the high-temperature steam in the continuous casting workshop is sucked into the steam discharge pipe 6, it contacts and condenses with the water sprayed from the high-pressure nozzles 3, and the two condense into water droplets, which flow along the inner wall of the steam discharge pipe 6 to the water outlet 7 and enter the water circulation system; some water droplets that have not entered the water inlet are discharged through the fan.

[0022] Preferably, the water supply pipe assembly includes a water inlet main pipe 1 connected to the water supply equipment, and a water inlet branch pipe 2 used to connect the water inlet main pipe 1 and each high-pressure nozzle 3; the water inlet branch pipe 2 passes through the mounting hole opened on the steam exhaust main pipe 6 and is inserted into the supporting steel pipe 4 to be connected to the high-pressure nozzle 3; the supporting steel pipe 4 is arranged on the inner wall of the steam exhaust main pipe 6, and the gap between the steam exhaust main pipe 6 and the water inlet branch pipe 2 is sealed with a filler 5.

[0023] like Figure 1 and Figure 2 As shown, when the cross section of the steam exhaust pipe 6 is square (the cross section size in this embodiment is 1.5m×1.5m), it includes four side panels, and the arrangement method of the water supply pipe assembly and the high-pressure nozzle 3 is preferably: the water supply pipe assembly includes four water inlet pipes 1, and the four water inlet pipes 1 are respectively arranged on the four outer sides of the steam exhaust pipe 6; each water inlet pipe 1 is installed with multiple water inlet branches 2 corresponding to the high-pressure nozzles 3, and the steam exhaust pipe 6 is located at the same installation height relative to the high-pressure nozzles 3 on the two side panels; and the steel pipe used to install the high-pressure nozzle 3 is tilted downward, and the angle between the steel pipe and the horizontal line is 10°~20°. In the first embodiment, there are 14 water inlet pipes, each water inlet pipe 1 corresponds to four water inlet branches 2 and high-pressure nozzles 3, and the high-pressure nozzles 3 are arranged at intervals along the circumference of the steam exhaust pipe 6; one group of high-pressure nozzles 3 on two opposite side panels are 1.5m away from the casting platform, and the other group of high-pressure nozzles 3 on two opposite side panels are 1m away from the casting platform.

[0024] When the cross section of the steam exhaust pipe 6 is rectangular, it includes two long side panels and two short side panels, such as Figure 2 The cross-sectional dimensions shown are 2.3m (length) × 0.9m (width), and the arrangement method of the water supply pipe assembly and the high-pressure nozzle 3 is preferably as follows: the water supply assembly includes two water supply pipes arranged on the outer walls of the two long side panels of the steam exhaust main pipe 6, and multiple water inlet branches 2 corresponding to the high-pressure nozzles 3 are installed on each water inlet pipe, and the high-pressure nozzles 3 on the two long side panels of the steam exhaust main pipe 6 are located at different installation heights; and the steel pipes used to install the high-pressure nozzles 3 are tilted downward, and the angle between the steel pipe and the horizontal line is 25° to 35°. In this embodiment, there are two water inlet main pipes 1, and each water inlet main pipe 1 corresponds to 8 water inlet branches 2 and 8 high-pressure nozzles 3. The high-pressure nozzles 3 are evenly arranged at intervals of 0.3m along the length direction of the long side panels of the steam exhaust main pipe 6; the distance between the high-pressure nozzle 3 on one of the long side panels and the casting platform is 1m, and the distance between the high-pressure nozzle 3 on the other long side panel and the casting platform is 1.5m.

[0025] The working principle of the present invention is as follows: during normal production, the water droplets sprayed from the high-pressure nozzle 3 move downward at a certain angle, and condense in contact with a large amount of high-temperature steam generated after the cooling water of the continuous casting second cooling chamber is sprayed on the surface of the high-temperature casting billet. After the two are condensed into water droplets, they flow along the inner wall of the steam discharge main pipe 6 to the water outlet 7 and enter the water circulation system; some water droplets that have not entered the water inlet are discharged through the fan. The water droplets sprayed from the high-pressure nozzle 3 can not only cool the steam moving upward, but also provide a nucleating agent for the condensation of water vapor, so that more water vapor in the steam condenses into water droplets with larger diameters.

[0026] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A secondary cooling steam descaling device for continuous casting, characterized in that: It includes a water supply pipe assembly and a plurality of high-pressure nozzles connected to the water supply pipe assembly; the high-pressure nozzles are installed on the inner side wall of the steam discharge pipe of the continuous casting workshop, and the inner bottom of the steam discharge pipe is provided with a drain port connected to the water circulation system; the high-temperature steam in the continuous casting workshop is sucked into the steam discharge pipe, and condenses in contact with the water sprayed from the high-pressure nozzles, and the two condense into water droplets, which flow along the inner wall of the steam discharge pipe to the water outlet and enter the water circulation system; The cross section of the steam discharge main pipe is square, and water inlet main pipes are evenly distributed on the four side plates of the steam discharge main pipe. Each water inlet main pipe is provided with a plurality of water inlet branch pipes correspondingly connected to the high-pressure nozzles, and the high-pressure nozzles are arranged at intervals along the circumference of the four side plates of the steam discharge main pipe; The water droplets ejected from the high-pressure nozzle cool the upward-moving steam and provide a nucleating agent for the condensation of the water vapor; The steam exhaust main pipe is located at the same installation height relative to the high-pressure nozzles on the two side panels; The supporting steel pipe used to install the high-pressure nozzle is tilted downward, and the angle between the supporting steel pipe and the horizontal line is 10°~20°; The water supply pipe assembly includes a water inlet main pipe connected to the water supply equipment, and a water inlet branch pipe used to connect the water inlet main pipe and the high-pressure nozzle; the water inlet branch pipe passes through the mounting hole opened on the steam exhaust main pipe and is inserted into the supporting steel pipe to be connected to the high-pressure nozzle; the supporting steel pipe is arranged on the inner wall of the steam exhaust main pipe, and the gap between the steam exhaust main pipe and the water inlet branch pipe is sealed with a filler.

2. The secondary cooling steam descaling device for continuous casting according to claim 1, characterized in that: The cross section of the steam exhaust main pipe is rectangular, and a water inlet main pipe is installed on the outer walls of the two long side plates of the steam exhaust main pipe. Each water inlet pipe is installed with multiple water inlet branches corresponding to high-pressure nozzles; the high-pressure nozzles are distributed at intervals along the length direction of the two long side plates.

3. The secondary cooling steam descaling device for continuous casting according to claim 2, characterized in that: The high-pressure nozzles on the two long side panels of the steam exhaust main are located at different installation heights.

4. The secondary cooling steam descaling device for continuous casting according to claim 2, characterized in that: The supporting steel pipe used to install the high-pressure nozzle is tilted downward, and the angle between the steel pipe and the horizontal line is 25°~35°.

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