Slag treatment steam energy dissipation device

Abstract

The application discloses a slag treatment steam energy dissipation device, which comprises a centrifugal fan and a suction cover. The suction inlet of the centrifugal fan is connected with first and second suction pipes, and the air outlet pipe of the centrifugal fan is inserted into a slag return water channel. The suction cover is arranged above the water inlet of a spiral classifier, and one side of the suction cover is hinged to the base of the spiral classifier. A shielding curtain of the suction cover is arranged to hang down to the spiral classifier. A rotating mechanism is arranged beside the base of the spiral classifier to drive the suction cover to turn outward. The suction cover is provided with a flexible pipe which is detachably connected with the first suction pipe. The second suction pipe is communicated with the water tank of the lower water inlet of the spiral classifier through an energy dissipation aeration tank. A suction side opening is formed on the side of the second suction pipe close to the spiral classifier. A steam baffle is arranged between the suction side opening and the suction cover and fixed to the upper edge of the suction side opening. The application can economically and simply solve the problems of steam collection and energy dissipation, and is convenient for subsequent maintenance.

Description

Technical Field

[0001] This invention relates to the field of blast furnace slag treatment technology, and in particular to a steam energy dissipation device for a spiral classifier used in blast furnace slag treatment. Background Technology

[0002] Currently, the Minter process and IMBA process are commonly used for blast furnace slag treatment. Both methods are equipped with pneumatic elevators and spiral classifiers. The pneumatic elevator transports the high-temperature slag molten water through the inlet to the spiral classifier. This results in a large amount of steam escaping from the slag molten water inlet area, as well as from the outlet and its vicinity. This quenching steam contains chlorides, ammonia nitrogen, hydrogen sulfide, sulfur dioxide, as well as chloride ions and other toxic substances from the coking tailwater, posing a threat to steel structure corrosion and the health of on-site personnel.

[0003] At present, the treatment of quenching slag steam in China usually adopts methods such as spray cooling and sealing. The former is complicated and has a large construction cost, while the latter is not conducive to inspection and maintenance. Summary of the Invention

[0004] The purpose of this invention is to provide a steam energy dissipation device for slag treatment, which can economically and simply solve the problem of steam collection and energy dissipation, while facilitating subsequent maintenance.

[0005] To solve the above problems, the technical solution adopted by this invention is as follows: This slag treatment steam energy dissipation device includes a centrifugal fan, an adsorption hood, a shielding curtain, a rotating mechanism, an energy dissipation aeration box, and steam baffles. The air inlet of the centrifugal fan is connected to a first air inlet pipe and a second air inlet pipe, and the free end of the air outlet pipe connected to the air outlet of the centrifugal fan is inserted into the slag return ditch. The adsorption hood is positioned above the inlet of the spiral classifier, and one side of the adsorption hood is hinged to the base of the spiral classifier. The shielding curtain, which hangs down to the spiral classifier, is also provided on the adsorption hood. A rotating mechanism is provided next to the base of the spiral classifier to drive the adsorption hood to flip outward. The adsorption hood is provided with a flexible pipe that is detachably connected to the first suction pipe. The first suction pipe is connected to the adsorption hood through the flexible pipe. The second suction pipe is connected to the water tank at the bottom of the spiral classifier through an energy-dissipating aeration box. An air intake opening is provided on the side of the second suction pipe near the spiral classifier. A steam baffle is provided between the air intake opening and the adsorption hood. One side of the steam baffle is fixed to the upper edge of the air intake opening.

[0006] In the above-mentioned technical solution of the steam energy dissipation device for slag treatment, a more specific technical solution may be: the air outlet pipe has an energy dissipation pipe section lying horizontally in the slag return ditch, the pipe opening of the energy dissipation pipe section facing the water flow direction in the slag return ditch, at least half of the pipe opening being located below the liquid surface in the slag return ditch, and the portion of the energy dissipation pipe section buried below the liquid surface in the slag return ditch is provided with small holes.

[0007] Furthermore, valves are provided in the first suction pipe, the second suction pipe, and the exhaust pipe.

[0008] Furthermore, the steam baffle is inclined downwards from the suction side opening toward the spiral classifier.

[0009] Furthermore, the flexible tube is a corrugated tube.

[0010] Furthermore, the rotating mechanism is a hydraulic cylinder, with one end of the cylinder body mounted on a column located next to the base of the spiral classifier, and the other end hinged to the adsorption hood.

[0011] Furthermore, rain shelters are respectively installed above the centrifugal fan and the valve.

[0012] Furthermore, the impeller of the centrifugal fan is made of high-temperature corrosion-resistant stainless steel.

[0013] Furthermore, the high-temperature corrosion-resistant stainless steel is 316L stainless steel.

[0014] Furthermore, the casing of the centrifugal fan is coated with a high-temperature and corrosion-resistant coating.

[0015] By adopting the above technical solution, the present invention has the following advantages compared with the prior art:

[0016] 1. A centrifugal fan is used to connect two ducts to the adsorption hood located above the inlet of the spiral classifier and the energy-dissipating aeration box connected to the outlet of the spiral classifier. Steam from the inlet and outlet areas of the spiral classifier is drawn into the fan and discharged into the slag return ditch through the outlet duct. The kinetic energy of the flowing water dissipates the adsorbed steam, and the condensate is recycled into the water circulation system. The adsorption hood is equipped with a suspended curtain and an opening on the suction side of the second suction pipe with a fixed steam baffle. This not only prevents the energy dissipation device from affecting the normal operation of the spiral classifier, but also guides as much steam as possible into the corresponding suction pipe, preventing steam overflow. This method of collecting and dissipating steam is economical and simple, reducing costs. One side of the suction hood is hinged to the spiral suction fan base and rotated by a rotating mechanism. A detachable flexible pipe connects the suction hood and the first suction pipe. The rotatable adsorption hood provides space for future maintenance and facilitates routine inspections.

[0017] 2. The air outlet pipe is equipped with an energy dissipation pipe section that lies horizontally in the slag return ditch. The opening of the energy dissipation pipe section faces the direction of water flow, and at least half of the opening is below the liquid surface in the slag return ditch. This allows the steam to fully contact the liquid in the ditch within the air outlet pipe, causing the water vapor molecules in the steam to quickly lose energy and condense into water droplets, which then collect and are discharged with the liquid in the ditch, achieving the purpose of recycling. It also prevents the liquid from flowing back into the blower. Small holes are made in the part of the energy dissipation pipe section that is buried below the liquid surface, allowing slag water to enter the energy dissipation pipe section through the small holes. This ensures that the water in the slag return ditch is level inside and outside the pipe, ensuring that the steam condenses into water and is smoothly discharged from the air outlet pipe into the slag return ditch.

[0018] 3. Valves are installed in each air intake and exhaust pipe to control the airflow, ensure the normal operation of the fan, and prevent the fan from being overloaded, reducing efficiency, or even being damaged.

[0019] 4. The inclined steam baffle allows the steam between the energy dissipation aeration box and the shielding curtain to be accurately and quickly drawn into the second air duct, thereby reducing steam leakage.

[0020] 5. The flexible pipe uses corrugated pipe, which is easy to connect with the suction pipe. It has high strength, high temperature resistance and corrosion resistance, and can pass a large flow rate. It can operate stably for a long time in harsh working environments.

[0021] 6. The rotating mechanism has a simple structure and is easy to operate and maintain.

[0022] 7. Rain shelters are installed above the blowers and valves to prevent slag from falling off.

[0023] 8. The material of the fan impeller and the coating on the casing improve corrosion resistance and extend service life. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the steam energy dissipation device for slag treatment.

[0025] Figure 2 This is a top view of the adsorption hood.

[0026] Explanation of reference numerals in the attached diagram: 1. Centrifugal fan; 2. Main suction pipe; 3. First suction pipe; 4. Second suction pipe; 5. Exhaust pipe; 6. Water tank at the drain outlet; 7. Energy-dissipating aeration box; 8. Suction side opening; 9. Steam baffle; 10. Shielding curtain; 11. Corrugated pipe; 12. Adsorption hood; 13. Hydraulic cylinder; 14. Column; 15. Water inlet; 16. Spiral classifier; 17. Spiral classifier base; 18. Energy-dissipating pipe section; 19. Sludge return ditch; 20. Liquid surface. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0028] Figure 1 The slag treatment steam energy dissipation device shown employs a negative pressure method to draw the slag-water steam generated by the inlet 15 and outlet of the spiral classifier 16 into the slag return ditch 19 for condensation and entry into the water circulation system, thereby achieving energy dissipation and recovery of the steam. It mainly includes a centrifugal fan 1, a main suction pipe 2, a first suction pipe 3, a second suction pipe 4, an outlet pipe 5, an energy dissipation aeration box 7, a steam baffle 9, a shielding curtain 10, an adsorption hood 12, and a rotating mechanism. The centrifugal fan 1 is modified from a conventional 4-72-6c centrifugal fan by altering the impeller and casing. The modification involves spraying the casing with a high-temperature and corrosion-resistant coating, and the impeller is made of high-temperature and corrosion-resistant stainless steel. In this embodiment, the impeller is made of 316L stainless steel. Centrifugal fan 1 is installed on a fan mounting base. The air inlet of centrifugal fan 1 is connected to the first air inlet pipe 3 and the second air inlet pipe 4 through the main air inlet pipe 2 (in other embodiments, a double-suction centrifugal fan can be used to increase the air volume, and the first air inlet pipe and the second air inlet pipe are directly connected to the two air inlets of the double-suction centrifugal fan). The air outlet is connected to the air outlet pipe 5. The first air inlet pipe 3, the second air inlet pipe 4 and the air outlet pipe 5 are all made of DN250mm stainless steel pipes. Each pipe is equipped with a valve. The direction and position of each pipe should be carefully considered to avoid interference with the maintenance walkway space. Rain shelters can also be installed above centrifugal fan 1 and each valve to prevent slag from falling off. The other end of the first suction pipe 3 is connected to the adsorption hood 12 via a flexible pipe. The flexible pipe is detachably connected to the first suction pipe 3. The second suction pipe 4 is connected to the water tank 6 at the bottom of the spiral classifier 16 via the energy dissipation aeration box 7. The steam that escapes is supplemented by the suction side opening 8 and the steam baffle 9 set in the second suction pipe 4. The free end of the outlet pipe 5 is inserted into the slag return ditch 19, so that the steam drawn in by the centrifugal fan 1 from the first suction pipe 3 and the second suction pipe 4 is sent from the outlet pipe 5 to the slag return ditch 19, and the energy dissipation and reuse are achieved by the flow of slag water.

[0029] In this embodiment, the adsorption cover 12 is made into a quadrilateral pyramid shape, which is smaller at the top and larger at the bottom (see...). Figure 2The adsorption hood 12 is installed above the spiral classifier 16 at a position corresponding to the inlet 15. One side of the adsorption hood 12 is hinged to the spiral classifier base 17, while the other three sides are suspended. The adsorption hood 12 is inclined, with the side of the adsorption hood 12 opposite to the hinged side at a higher position. At least on this higher side, a hanging shielding curtain 10 is installed. Preferably, hanging shielding curtains 10 are installed on the other three sides of the non-hinged side. The shielding curtains 10 hang down to the surface of the spiral classifier 16 to reduce the escape of steam from the inlet 15. A column 14 made of channel steel is fixed next to the spiral classifier base 17. A rotating mechanism mounted on the column 14 is connected to the adsorption hood 12 to support the adsorption hood 12 under normal conditions, keeping it in an inclined state. During maintenance, it can be flipped outward to create sufficient space for maintenance. The rotating mechanism uses a hydraulic cylinder 13. The cylinder body of the hydraulic cylinder 13 is mounted on the column 14, and the extended end is hinged to the adsorption hood 12. During operation, the adsorption hood 12 is held at a 60° angle between the bottom edge of the hood and the vertical plane, which can prevent steam from escaping to the greatest extent without affecting the normal operation of the spiral classifier 16. The flexible tube connected to the upper port of the adsorption hood 12 is made of a corrugated pipe 11. One end of the corrugated pipe 11 is fixedly connected to the adsorption hood 12 so that it can be rotated together with the adsorption hood 12, and the other end is detachably connected to the first suction pipe 3. When it is necessary to rotate the adsorption hood 12 for maintenance, the connecting piece between the first suction pipe 3 and the corrugated pipe 11 can be removed.

[0030] One end of the second suction pipe 4 is connected to the top of the energy-dissipating aeration box 7. The energy-dissipating aeration box 7 can be inserted into the water tank 6 at the bottom of the spiral classifier 16. The lower end of the energy-dissipating aeration box 7 is open, so that the sludge and water vapor generated at the bottom of the water outlet enters the energy-dissipating aeration box 7 for partial energy dissipation before being drawn into the centrifugal fan 1 through the second suction pipe 4. Considering that the steam generated near the bottom of the water outlet and some of the water inlet cannot be completely drawn into the centrifugal fan 1 through the energy-dissipating aeration box 7 or the adsorption hood 12, a suction side opening 8 is provided on the side of the second suction pipe 4 near the spiral classifier 16. The lower end of the suction side opening 8 extends to the top of the energy-dissipating aeration box 7, and a steam baffle 9 is fixedly welded to the upper edge. The steam baffle 9 is inclined downward from the suction side opening 8 toward the spiral classifier 16, and the lower end of the steam baffle 9 is close to the working position of the adsorption hood 12.

[0031] The air outlet pipe 5 passes under the spiral classifier 16 and is inserted into the slag return ditch 19. The air outlet pipe 5 has an energy dissipation pipe section 18 lying horizontally in the slag return ditch 19. The opening of the energy dissipation pipe section 18 faces the direction of water flow in the slag return ditch 19, and at least half of the opening of the energy dissipation pipe section 18 is below the liquid surface 20 in the slag return ditch 19. In this embodiment, the distance from the bottom of the energy dissipation pipe section 18 to the liquid surface 20 is 150mm. The portion of the energy dissipation pipe section 18 buried below the liquid surface 20 in the slag return ditch 19 is provided with small holes to allow the water flowing in the slag return ditch 19 to enter the energy dissipation pipe section 18.

[0032] During operation, centrifugal fan 1 is started. Most of the slag-water vapor generated by the inlet 15 of spiral classifier 16 enters centrifugal fan 1 under the negative pressure of the fan through the shielding curtain 10, suction hood 12, corrugated pipe 11, and first suction pipe 3. At the same time, the slag-water vapor generated by the outlet of spiral classifier 16 is partially dissipated by the energy dissipation aeration box 7 and then enters centrifugal fan 1 through the second suction pipe 4. The slag-water vapor between the suction hood 12, shielding curtain 10, and energy dissipation aeration box 7 is drawn into centrifugal fan 1 through the second suction pipe 4 from the suction side opening 8 under the guidance of steam baffle 9. All the steam drawn into the fan is thrown out by the high-speed rotation of the impeller. The thrown-out slag-water vapor is transported to the return slag water ditch 19 through the outlet pipe 5. When the high-temperature steam comes into contact with the low-temperature flowing water in the return slag water ditch, it is condensed into water droplets and flows into the water. Energy dissipation and reuse are achieved by the flow of slag water.

[0033] The steam energy dissipation device for slag treatment uses centrifugal fan 1 to draw in steam from the slag treatment, greatly reducing steam leakage and protecting the health of the on-site steel structure and the personnel on duty. By modifying ordinary centrifugal fans, it can not only reduce costs and achieve corrosion prevention in an economical and simple way, but also enable the steam to be efficiently recovered while dissipating energy, thus realizing energy saving and consumption reduction.

Claims

1. A steam energy dissipation device for slag treatment, characterized in that: The system includes a centrifugal fan, an adsorption hood, a shielding curtain, a rotating mechanism, an energy-dissipating aeration box, and a steam baffle. The centrifugal fan's air inlet is connected to a first air intake pipe and a second air intake pipe, and the free end of the air outlet pipe connected to the centrifugal fan's air outlet is inserted into the slag return ditch. The adsorption hood is positioned above the inlet of the spiral classifier, with one side of the adsorption hood hinged to the spiral classifier's base. The adsorption hood also has a shielding curtain suspended from the spiral classifier. A rotating mechanism that drives the adsorption hood to flip outward is located next to the spiral classifier's base. The adsorption hood has a flexible pipe detachably connected to the first air intake pipe, which communicates with the adsorption hood through the flexible pipe. The second air intake pipe communicates with the spiral classifier's outlet tank through the energy-dissipating aeration box. An air intake side opening is provided on the side of the second air intake pipe closest to the spiral classifier. A steam baffle is provided between the air intake side opening and the adsorption hood, with one side of the steam baffle fixed to the upper edge of the air intake side opening.

2. The slag treatment steam energy dissipation device according to claim 1, characterized in that: The air outlet pipe has an energy dissipation pipe section that lies horizontally in the slag return ditch. The opening of the energy dissipation pipe section faces the direction of water flow in the slag return ditch. At least half of the opening is located below the liquid surface in the slag return ditch. The portion of the energy dissipation pipe section buried below the liquid surface in the slag return ditch is provided with small holes.

3. The slag treatment steam energy dissipation device according to claim 2, characterized in that: The first suction pipe, the second suction pipe, and the exhaust pipe are all equipped with valves.

4. The slag treatment steam energy dissipation device according to claim 3, characterized in that: The steam baffle is inclined downwards from the suction side opening toward the spiral classifier.

5. The slag treatment steam energy dissipation device according to claim 4, characterized in that: The flexible tube is a corrugated tube.

6. The slag treatment steam energy dissipation device according to claim 5, characterized in that: The rotating mechanism is a hydraulic cylinder. The cylinder body is mounted on a column located next to the base of the spiral classifier, and the other end is hinged to the adsorption cover.

7. The slag treatment steam energy dissipation device according to claim 6, characterized in that: Rain shelters are installed above the centrifugal fan and the valve, respectively.

8. The slag treatment steam energy dissipation device according to any one of claims 1 to 7, characterized in that: The impeller of the centrifugal fan is made of high-temperature corrosion-resistant stainless steel.

9. The slag treatment steam energy dissipation device according to claim 8, characterized in that: The high-temperature corrosion-resistant stainless steel is 316L stainless steel.

10. The slag treatment steam energy dissipation device according to claim 9, characterized in that: The casing of the centrifugal fan is coated with a high-temperature and corrosion-resistant paint.

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