Evaporation cooling device for slag and iron runner of blast furnace casting house

Abstract

The utility model relates to an evaporative cooling device for a slag-iron runner of a blast furnace casting house, and belongs to the technical field of ironmaking processes in the metallurgical industry. According to the technical scheme, a cooling box body (8) is of a U-shaped structure matched with the slag and iron runner of the blast furnace casting house, the cooling box body (8) is arranged outside the slag and iron runner of the blast furnace casting house, the interior of the cooling box body (8) is divided into a plurality of cooling gas flow channels (9), each cooling gas flow channel (9) corresponds to a high-pressure atomization spray head (7) facing the cooling gas flow channel (9), and the high-pressure atomization spray heads (7) face the cooling gas flow channels (9). Each high-pressure atomizing nozzle (7) is connected with the water supply main pipe (1) through a water supply branch pipe (4), and the air outlet pipe (14) is connected to one side of the cooling box body (8); and a thermocouple (10) is arranged on the cooling box body (8). The slag iron runner cooling device has the advantages that an air and atomized water cooling mode is adopted, the cooling effect is good, the service life of refractory materials in a slag iron runner area can be effectively prolonged, and the consumption of the refractory materials per ton of iron is reduced.

Description

Technical Field

[0001] The utility model relates to a slag ditch vaporization cooling device in a blast furnace tapping site, belonging to the technical field of ironmaking technology in the metallurgical industry. Background Art

[0002] During the iron-tapping process in the blast furnace casthouse, the main iron ditch is a crucial channel for discharging and separating high-temperature slag iron. The safety and longevity of the main ditch are crucial for the stable and smooth operation of the blast furnace. Due to the thermal radiation from the molten iron in the iron-storage main iron ditch and branch iron ditch, the blast furnace casthouse slag ditch often experiences excessive consumption of refractory materials per ton, deformation and cracking of the steel shell, and pulverization and failure of the concrete beams and support plates at the bottom of the slag ditch area due to excessive temperatures. Currently, air or water cooling is used to cool the slag ditch. Water cooling poses safety risks such as cooling water leaking into the molten iron, causing splashing and explosions. Ventilation cooling also offers limited cooling effectiveness. Utility Model Content

[0003] The purpose of the utility model is to provide a slag ditch vaporization cooling device for a blast furnace iron-making yard, which adopts an air plus atomized water cooling method, has a good cooling effect, can effectively extend the service life of the slag ditch area refractory, reduce the consumption of refractory per ton of iron, and solve the problems existing in the background technology.

[0004] The technical solution of the utility model is:

[0005] A blast furnace casthouse slag ditch vaporization cooling device comprises a water supply main pipe, a water supply branch pipe, a high-pressure atomizing nozzle, a cooling box, a cooling gas flow channel and an air outlet pipe. The cooling box is a U-shaped structure that matches the slag ditch in the blast furnace casthouse. The cooling box is arranged outside the slag ditch in the blast furnace casthouse. The cooling box is divided into several cooling gas flow channels. Each cooling gas flow channel corresponds to a high-pressure atomizing nozzle facing the cooling gas flow channel. Each high-pressure atomizing nozzle is connected to the water supply main pipe through a water supply branch pipe. The air outlet pipe is connected to one side of the cooling box.

[0006] The water supply main is equipped with a manual stop valve and a pressure gauge, the water supply branch is equipped with a manual stop valve and an electric ball valve, and the air outlet is equipped with an electric butterfly valve and a manual butterfly valve.

[0007] Staggered cooling plates are welded in the cooling gas flow channel, and S-shaped channels are formed between the staggered cooling plates.

[0008] The cooling box is provided with a thermocouple.

[0009] The air outlet pipe is connected to the dust removal system of the blast furnace iron-making yard through a dust removal pipeline.

[0010] By adopting the utility model, the water mist sprayed from the high-pressure atomizing nozzle is mixed with the air and enters the cooling gas flow channel in the cooling box, and performs heat exchange with the cooling plate in the cooling gas flow channel. The fine water mist is vaporized, and the vaporized atomized water enters the dust removal pipe in the iron mouth area together with the hot air through the air outlet pipe, and finally enters the iron-making yard dust removal system. The fan of the iron-making yard dust removal system forms a negative pressure in the cooling gas flow channel, so that the mixed gas can flow smoothly in the gas flow channel.

[0011] The beneficial effects of the utility model are: the air plus atomized water cooling method is adopted, the cooling effect is good, the service life of the slag iron ditch area refractory can be effectively extended, the iron flow rate is increased, and the consumption of refractory per ton of iron is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of the utility model;

[0013] Figure 2 This is the AA cross-sectional view of the utility model;

[0014] Figure 3 This is the BB cross-sectional view of the utility model;

[0015] In the figure: water supply main 1, manual stop valve for water supply main 2, on-site pressure gauge 3, water supply branch pipe 4, manual stop valve for water supply branch 5, electric ball valve for water supply branch 6, high-pressure atomizing nozzle 7, cooling box 8, cooling gas flow channel 9, thermocouple 10, cooling plate 11, electric butterfly valve 12, manual butterfly valve 13, air outlet pipe 14, concrete 15. DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to the accompanying drawings and examples.

[0017] Refer to the attached Figure 1-3 A slag ditch vaporization cooling device for a blast furnace iron-making yard comprises a water supply main pipe 1, a water supply branch pipe 4, a high-pressure atomizing nozzle 7, a cooling box 8, a cooling gas flow channel 9 and an air outlet pipe 14. The cooling box 8 is a U-shaped structure that matches the slag ditch in the blast furnace iron-making yard. The cooling box 8 is arranged outside the slag ditch in the blast furnace iron-making yard. The cooling box 8 is divided into several cooling gas flow channels 9. Each cooling gas flow channel 9 corresponds to a high-pressure atomizing nozzle 7 facing the cooling gas flow channel 9. Each high-pressure atomizing nozzle 7 is connected to the water supply main pipe 1 through a water supply branch pipe 4. The air outlet pipe 14 is connected to one side of the cooling box 8.

[0018] In this embodiment, refer to the attached Figure 1-3The evaporative cooling device includes a water supply main pipe 1, a manual stop valve 2 for the water supply main pipe, an on-site pressure gauge 3, a water supply branch pipe 4, a manual stop valve 5 for the water supply branch pipe, an electric ball valve 6 for the water supply branch pipe, a high-pressure atomizing nozzle 7, a cooling box 8, a cooling gas flow channel 9, a thermocouple 10, a cooling plate 11, an electric butterfly valve 12, a manual butterfly valve 13, an air outlet pipe 14, and concrete 15, wherein:

[0019] The cooling box 8 is open near the iron outlet of the blast furnace. A high-pressure atomizing nozzle 7 is provided on the open side of the cooling box 8. The water mist sprayed by the high-pressure atomizing nozzle 7 is mixed with air and enters the cooling box 8. The cooling box 8 is divided into several cooling gas flow channels 9, and a high-pressure atomizing nozzle 7 is provided at the end of each cooling gas flow channel 9.

[0020] Staggered cooling plates 11 are welded within the cooling gas flow channel 9, forming an S-shaped channel between the staggered cooling plates 11 to improve heat exchange efficiency. The cooling gas exchanges heat with the cooling box 8 and cooling plates 11, vaporizing the fine water mist and lowering its temperature. The vaporized water, along with the hot air, enters the iron mouth area dust removal duct through the outlet pipe 14 and ultimately enters the iron casting yard dust removal system. The iron casting yard dust removal system fan creates a negative pressure within the cooling gas flow channel 9, allowing the mixed gas to circulate smoothly within the gas flow channel 9. The outlet pipe 14 is equipped with an electric butterfly valve 12 and a manual butterfly valve 13 for air volume control and maintenance.

[0021] The high-pressure water used by the high-pressure atomizing nozzle 7 comes from the blast furnace industrial water pipeline. The water supply main 1 is provided with a manual stop valve 2 and a pressure gauge 3 for maintenance. Each high-pressure atomizing nozzle 7 corresponds to a water supply branch pipe 4, and each water supply branch pipe 4 is installed with a manual stop valve 5 and an electric ball valve 6.

[0022] Thermocouples 10 are equidistantly embedded in the casthouse concrete structure at the bottom and side walls of the cooling box 8. The temperature measurement by the thermocouples 10 is interlocked with the electric ball valves 6 on the water supply manifolds. When the temperature measured by the thermocouples 10 is ≥200°C, the electric ball valves 6 are opened, and the number of electric ball valves 6 can be adjusted according to the temperature. When the temperature measured by the thermocouples 10 is <200°C, the electric ball valves 6 are closed, and air cooling mode is entered. Each high-pressure atomizing nozzle 7 consumes approximately 2.5 m³ / h of industrial water. After the temperature exceeds the set point, each opening lasts approximately 3-5 minutes. During blast furnace tapping, the nozzles are opened an average of 3-4 times per hour. Based on the 16 high-pressure atomizing nozzles 7 in this example, total industrial water consumption is approximately 14 m³ / h if all valves are open. Based on the current air volume of the blast furnace dust removal system, a 1.7% increase in moisture content would have little impact on the system.

[0023] The internal structure of the cooling box 8 is shown in the BB section in the accompanying figure. The cooling plates 11 are welded at equal intervals and staggered in the cooling gas flow channel 9 to form an S-shaped channel. The cooling plates 11 are made of red copper with good thermal conductivity and coated on a steel plate, which has good thermal conductivity and anti-deformation effects.

[0024] The cooling gas flow channel 9 at the bottom of the cooling box 8 can also be divided by I-beams, and the I-beams have a good supporting effect on the slag iron groove on the upper part.

Claims

1. A slag ditch vaporization cooling device for a blast furnace tapping site, characterized in that: The invention comprises a water supply main pipe (1), a water supply branch pipe (4), a high-pressure atomizing nozzle (7), a cooling box (8), a cooling gas flow channel (9) and an air outlet pipe (14). The cooling box (8) is a U-shaped structure matched with the slag iron ditch of the blast furnace iron casting yard. The cooling box (8) is arranged outside the slag iron ditch of the blast furnace iron casting yard. The cooling box (8) is divided into a plurality of cooling gas flow channels (9). Each cooling gas flow channel (9) corresponds to a high-pressure atomizing nozzle (7) facing the cooling gas flow channel (9). Each high-pressure atomizing nozzle (7) is connected to the water supply main pipe (1) through a water supply branch pipe (4). The air outlet pipe (14) is connected to one side of the cooling box (8).

2. The slag ditch vaporization cooling device for a blast furnace tapping site according to claim 1, characterized in that: The water supply main pipe (1) is equipped with a water supply main pipe manual stop valve (2) and a pressure gauge (3); the water supply branch pipe (4) is equipped with a water supply branch pipe manual stop valve (5) and a water supply branch pipe electric ball valve (6); and the air outlet pipe (14) is equipped with an electric butterfly valve (12) and a manual butterfly valve (13).

3. The slag ditch vaporization cooling device for a blast furnace tapping site according to claim 1, characterized in that: Staggered cooling plates (11) are welded in the cooling gas flow channel (9), and S-shaped channels are formed between the staggered cooling plates (11).

4. The slag ditch vaporization cooling device for a blast furnace tapping site according to claim 1, characterized in that: A thermocouple (10) is provided on the cooling box (8).

5. The slag ditch vaporization cooling device for a blast furnace tapping site according to claim 1, characterized in that: The air outlet pipe (14) is connected to the dust removal system of the blast furnace iron-making yard through a dust removal pipeline.

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