Smoke cooling device for steelmaking

Abstract

The utility model relates to the technical field of steelmaking auxiliary equipment, in particular to a flue gas cooling device for steelmaking, which comprises a flue gas pipe mounted in a spray tower in an extending manner, and a cooling mechanism for performing heat exchange and cooling on high-temperature flue gas in the flue gas pipe is arranged on the outer side of the flue gas pipe. High-temperature flue gas in the flue gas pipe is subjected to secondary heat exchange and cooling through the water storage tank and the liquid storage tank, and the flue gas pipe with the snake-shaped structure increases the contact area with water in the water storage tank and heat exchange liquid in the liquid storage tank, so that the cooling efficiency is further improved; condensed high-temperature water vapor is pumped into the atomizing spray head to be atomized and sprayed out, and the flue gas introduced into the spray tower is subjected to third-time spray cooling, so that the high-temperature flue gas is reduced to a controllable range, the water vapor is recycled, water resources are saved, the cooling efficiency is improved, the flue gas is dispersed through a flue gas uniform distribution plate, and the cooling effect is improved. Therefore, the atomized water is better mixed with the flue gas, and the cooling efficiency of the flue gas is improved.

Description

Technical Field

[0001] This utility model relates to the field of steelmaking auxiliary equipment technology, and in particular to a flue gas cooling device for steelmaking. Background Technology

[0002] Steelmaking is a crucial step in the steel production process, and violent chemical reactions occur during oxygen blowing steelmaking. Elements such as carbon, silicon, and manganese in the molten iron react with oxygen to produce large amounts of high-temperature flue gas, which can typically reach temperatures of around 1400-1600℃.

[0003] Because these flue gases contain a large number of harmful substances, they cannot be directly emitted into the atmosphere and need to be purified. However, due to the extremely high temperature of the flue gases, direct purification would damage the dust removal and purification equipment. Therefore, it is necessary to cool down the high-temperature flue gases.

[0004] The main methods for cooling flue gas are natural air cooling and water spray cooling. Natural air cooling has extremely low cooling efficiency, and it is difficult to reduce the temperature of high-temperature steelmaking flue gas to a level that subsequent equipment can withstand. Water spray cooling often involves directly spraying atomized water into the high-temperature flue gas for cooling. The high-temperature flue gas has not been pretreated, resulting in a high consumption of water resources, increasing the production cost of enterprises, and failing to make reasonable use of the waste heat resources of the high-temperature flue gas. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a flue gas cooling device for steelmaking. It solves the technical problems of existing technologies that directly using atomized water spray to cool high-temperature flue gas is very water-intensive and does not make good use of the waste heat of high-temperature flue gas, resulting in resource waste. This invention achieves the goal of improving resource utilization and better cooling of high-temperature flue gas.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a flue gas cooling device for steelmaking, comprising a flue gas pipe extending and installed in a spray tower, wherein a cooling mechanism is provided on the outside of the flue gas pipe for heat exchange and cooling of the high-temperature flue gas inside.

[0007] The cooling mechanism includes a water storage tank and a liquid storage tank installed on the left side of the spray tower. The liquid storage tank is filled with heat exchange liquid. A cooler is installed on the back of the liquid storage tank. The flue gas pipe runs through the water storage tank and the liquid storage tank. The water storage tank is equipped with a condensation spray assembly that condenses high-temperature steam and then sprays it to cool the flue gas.

[0008] A further improvement is that the flue gas pipe meanders in a serpentine shape through the water storage tank and the liquid storage tank, and a smoke-dispersing cap is installed at the other end of the flue gas pipe that extends into the spray tower.

[0009] A further improvement is that the condensation spray assembly includes a condenser installed on the back of the liquid storage tank, and the water inlet of the condenser is equipped with a steam pipe that extends into the liquid storage tank at one end, and the condensation port of the condenser is equipped with a condensate pipe that extends into the spray tower at the other end, and an atomizing nozzle is installed at the other end of the condensate pipe. A booster pump for pressurizing the condensate in the condensate pipe is installed on the back of the liquid storage tank.

[0010] A further improvement is that the atomizing nozzle is located above the smoke distribution cap, and a smoke distribution plate is installed between the two. A swirl plate is installed above the inside of the spray tower, and an exhaust pipe is installed at the top of the spray tower to transport the cooled smoke.

[0011] A further improvement is that an observation window is installed on the front of the water storage tank, and a water level alarm is installed in the middle of the water storage tank. A water injection pipe is installed on the top of the back of the water storage tank, and a water intake pipe is installed in the middle of the back. Both the water injection pipe and the water intake pipe are equipped with electric sealing valves.

[0012] A further improvement is that a drain pipe is installed at the bottom of the back of the spray tower, and an electric sealing valve is also installed on the drain pipe.

[0013] By means of the above technical solution, this utility model provides a flue gas cooling device for steelmaking, which has at least the following beneficial effects:

[0014] 1. This utility model uses a water storage tank and a liquid storage tank to perform secondary heat exchange and cooling of the high-temperature flue gas in the flue gas pipe. The serpentine structure of the flue gas pipe increases the contact area with the water in the water storage tank and the heat exchange liquid in the liquid storage tank, further improving the cooling efficiency.

[0015] 2. This utility model pumps the condensed high-temperature water vapor into the atomizing nozzle and sprays it out, which sprays the flue gas entering the spray tower for a third time to cool it down, thereby reducing the high-temperature flue gas to a controllable range, realizing the recovery and reuse of water vapor, saving water resources, and improving the cooling efficiency.

[0016] 3. This utility model disperses the flue gas through a flue gas distribution plate, thereby better mixing the atomized water with the flue gas and improving the cooling efficiency of the flue gas. When flue gas with excessive moisture content passes through the swirl plate, the guide vanes on the swirl plate generate a strong centrifugal rotation, causing the moisture in the flue gas to be centrifugally thrown out, preventing the flue gas with excessive moisture content from corroding subsequent purification equipment. In addition, the centrifugal rotation of the flue gas during this process can also play a certain role in cooling, thus improving the cooling effect. Attached Figure Description

[0017] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0018] In the attached diagram:

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the rear view structure of this utility model;

[0021] Figure 3 This is a cross-sectional view of the internal structure of the cooling mechanism of this utility model;

[0022] Figure 4 This is a rear view of the independent structure of the cooling mechanism and condensation spray assembly of this utility model;

[0023] Figure 5 This is a cross-sectional schematic diagram of the internal structure of the spray tower of this utility model.

[0024] In the diagram: 1. Spray tower; 2. Flue gas pipe;

[0025] 3. Cooling mechanism; 31. Water storage tank; 32. Liquid storage tank; 33. Refrigerator;

[0026] 34. Condensation spray assembly; 341. Condenser; 342. Steam pipe; 343. Condensate pipe; 344. Atomizing nozzle; 345. Booster pump;

[0027] 35. Smoke cap; 36. Smoke distribution plate; 37. Swirl plate; 38. Exhaust pipe;

[0028] 41. Observation window; 42. Water level alarm; 43. Water inlet pipe; 44. Water intake pipe; 45. Electric sealing valve; 46. Sewage pipe. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Example 1

[0031] Given that existing technologies for directly cooling high-temperature flue gas using atomized water spraying are extremely wasteful of water resources and do not effectively utilize the waste heat of the flue gas, resulting in resource waste, this embodiment provides a flue gas cooling device for steelmaking. Please refer to... Figures 1-5 This embodiment provides a flue gas cooling device for steelmaking, which can improve resource utilization and better cool high-temperature flue gas. The flue gas cooling device includes a flue gas pipe 2 extending into a spray tower 1, and a cooling mechanism 3 installed on the outside of the flue gas pipe 2 to exchange heat and cool the high-temperature flue gas inside. The cooling mechanism 3 exchanges heat and cools the high-temperature flue gas in the flue gas pipe 2, and works in conjunction with a condensation spray assembly 34 to perform secondary spray cooling on the cooled high-temperature flue gas, improving cooling efficiency and recovering and utilizing the waste heat of the high-temperature flue gas, thus improving resource utilization and reducing water consumption.

[0032] Because existing technologies directly using atomized water spray to cool high-temperature flue gas are very water-intensive and do not effectively utilize the waste heat of the high-temperature flue gas, resulting in resource waste, this device is equipped with a cooling mechanism 3. The cooling mechanism 3 includes a water storage tank 31 and a liquid storage tank 32 installed on the left side of the spray tower 1. The liquid storage tank 32 is filled with heat exchange fluid, and a cooler 33 is installed on the back of the liquid storage tank 32. The flue gas pipe 2 passes through the water storage tank 31 and the liquid storage tank 32. The water storage tank 31 is equipped with a device to condense the high-temperature steam. The condensing spray assembly 34 then sprays and cools the flue gas. The flue gas pipe 2 first passes through the inside of the water storage tank 31, where the water inside the tank exchanges heat with the high-temperature flue gas inside the flue gas pipe 2 to cool it down. The high-temperature flue gas also heats the water in the water storage tank 31. This can be done in another way to utilize the waste heat of the high-temperature flue gas. Subsequently, the high-temperature flue gas in the flue gas pipe 2 passes through the liquid storage tank 32, where the heat exchange liquid cooled by the refrigerator 33 in the tank exchanges heat with the high-temperature flue gas in the flue gas pipe 2 a second time to cool it down, thus improving the cooling effect.

[0033] The flue gas pipe 2 meanders in a serpentine shape through the water storage tank 31 and the liquid storage tank 32. The serpentine structure of the flue gas pipe 2 increases the contact area with the water in the water storage tank 31 and the heat exchange liquid in the liquid storage tank 32, thereby improving the cooling efficiency. In addition, a smoke distribution cap 35 is installed at the other end of the flue gas pipe 2 that extends into the spray tower 1.

[0034] After heating the water in the water storage tank 31 with the high-temperature flue gas in the flue gas pipe 2, directly discharging the high-temperature steam from the water storage tank 31 would inevitably waste water resources. Therefore, the device is also equipped with a condensation spray assembly 34. The condensation spray assembly 34 includes a condenser 341 installed on the back of the liquid storage tank 32, and a steam pipe 342 extending into the water storage tank 31 at one end is installed at the water inlet of the condenser 341. A condensate water pipe 343 extending into the spray tower 1 at one end is installed at the condensation port of the condenser 341, and an atomizing nozzle 344 is installed at the other end of the condensate water pipe 343. An atomizing nozzle 344 is installed on the back of the liquid storage tank 32. A booster pump 345 pressurizes the condensate in the condensate pipe 343. High-temperature water vapor in the water storage tank 31 enters the condenser 341 through the steam pipe 342 for condensation. The condensate flows through the condensate pipe 343 and is sprayed out through the atomizing nozzle 344 under the pressure of the booster pump 345. This sprays the flue gas entering the spray tower 1 for the third time to cool it down, thereby reducing the high-temperature flue gas to a controllable range. The water vapor is also recycled, saving water resources and improving the cooling efficiency. During the spraying process, large particulate impurities and some water-soluble harmful substances in the high-temperature flue gas can be reduced and purified.

[0035] To prevent the high-temperature flue gas from completely evaporating the water in the water storage tank 31, the device has an observation window 41 installed on the front of the water storage tank 31, and a water level alarm 42 installed in the middle of the water storage tank 31. A water injection pipe 43 is installed on the top of the back of the water storage tank 31, and a water intake pipe 44 is installed in the middle of the back. Both the water injection pipe 43 and the water intake pipe 44 are equipped with electric sealing valves 45. The remaining water level in the water storage tank 31 can be observed in real time through the observation window 41. When the remaining water level in the water storage tank 31 is lower than the water level alarm 42, the water level alarm 42 will send an alarm signal to the external control panel to remind workers to inject water into the water storage tank 31 through the water injection pipe 43 in time. Boiled water in the water storage tank 31 can be taken out through the water intake pipe 44 to realize the utilization of the waste heat of the high-temperature flue gas.

[0036] A drain pipe 46 is installed at the bottom back of the spray tower 1, and an electric sealing valve 45 is also installed on the drain pipe 46. The sewage that has settled at the bottom of the spray tower 1 can be discharged by periodically opening the electric sealing valve 45 on the drain pipe 46.

[0037] Example 2

[0038] Based on Example 1, such as Figures 1-5As shown, in order to further improve the spray cooling effect, the device positions the atomizing nozzle 344 above the smoke distribution cap 35, with a flue gas distribution plate 36 installed between them. A swirl plate 37 is installed above the inside of the spray tower 1, and an exhaust pipe 38 is installed at the top of the spray tower 1 to transport the cooled flue gas. The high-temperature flue gas in the flue gas pipe 2 impacts the smoke distribution cap 35, thus dispersing it. It then flows through the flue gas distribution plate 36 to further disperse the flue gas, thereby better mixing the atomized water sprayed by the atomizing nozzle 344 with the flue gas, improving the cooling efficiency of the flue gas. After spray cooling, when the flue gas with excessive moisture content passes upward through the swirl plate 37, the flue gas generates a strong centrifugal rotation motion through the guide vanes on the swirl plate 37, causing the moisture in the flue gas to be centrifugally thrown out, preventing the flue gas with excessive moisture content from corroding subsequent purification equipment. In addition, the centrifugal rotation of the flue gas during this process also plays a certain role in cooling, improving the cooling effect.

[0039] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flue gas cooling device for steelmaking, comprising a flue gas pipe (2) extending and installed within a spray tower (1), characterized in that: A cooling mechanism (3) is provided on the outside of the flue pipe (2) to exchange heat and cool down the high-temperature flue gas inside it; The cooling mechanism (3) includes a water tank (31) and a liquid storage tank (32) installed on the left side of the spray tower (1). The liquid storage tank (32) is filled with heat exchange liquid. A cooler (33) is installed on the back of the liquid storage tank (32). The flue gas pipe (2) passes through the water tank (31) and the liquid storage tank (32). The water tank (31) is equipped with a condensation spray assembly (34) that condenses high-temperature steam and sprays it to cool the flue gas.

2. The flue gas cooling device for steelmaking according to claim 1, characterized in that: The flue gas pipe (2) meanders in a serpentine shape through the water storage tank (31) and the liquid storage tank (32), and a smoke-dispersing cap (35) is installed at the other end of the flue gas pipe (2) that extends into the spray tower (1).

3. The flue gas cooling device for steelmaking according to claim 2, characterized in that: The condensation spray assembly (34) includes a condenser (341) installed on the back of the storage tank (32), and the water inlet of the condenser (341) is equipped with a steam pipe (342) extending into the storage tank (31) at one end, and the condensation interface of the condenser (341) is equipped with a condensate pipe (343) extending into the spray tower (1) at the other end, and an atomizing nozzle (344) is installed at the other end of the condensate pipe (343). A booster pump (345) for pressurizing the condensate in the condensate pipe (343) is installed on the back of the storage tank (32).

4. The flue gas cooling device for steelmaking according to claim 3, characterized in that: The atomizing nozzle (344) is located above the smoke cap (35), and a flue gas distribution plate (36) is installed between them. A swirl plate (37) is installed above the inside of the spray tower (1), and an exhaust pipe (38) is installed on the top of the spray tower (1) to transport the cooled flue gas.

5. The flue gas cooling device for steelmaking according to claim 1, characterized in that: The water storage tank (31) has an observation window (41) installed on the front, and a water level alarm (42) is installed in the middle of the water storage tank (31). A water injection pipe (43) is installed on the top of the back of the water storage tank (31), and a water intake pipe (44) is installed in the middle of the back. Both the water injection pipe (43) and the water intake pipe (44) are equipped with electric sealing valves (45).

6. The flue gas cooling device for steelmaking according to claim 5, characterized in that: The bottom back of the spray tower (1) is equipped with a drain pipe (46), and an electric sealing valve (45) is also installed on the drain pipe (46).

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