Atmospheric pressure sludge tank and atmospheric pressure sludge sealing method

Abstract

This invention relates to the field of slag annealing, specifically to an atmospheric pressure slag annealing tank and a method for atmospheric pressure slag annealing. The atmospheric pressure slag annealing tank includes a tank body, coils, a water storage jacket, and a water pump. The coils pass through the top wall of the tank body, forming an inner coil and an outer coil. The inner coil spirals upwards along the inner wall of the tank body from the middle, with its diameter gradually decreasing, and a notch is provided at the position of smallest diameter. The outer coil extends downwards outside the tank body, with its diameter gradually increasing. The water storage jacket is located on the outer peripheral wall of the lower end of the tank body, and its top wall is connected to an upwardly extending balance pipe. The lower end of the outer coil is connected to the water storage jacket. The water pump connects the water storage jacket and the lower end of the inner coil, and is used to pump water from the water storage jacket into the inner coil. This invention can achieve slag annealing and hot gas treatment without pressure safety risks, and without generating wastewater or waste gas.

Description

Technical Field

[0001] This invention relates to the field of slag sealing, and more specifically to an atmospheric pressure slag sealing tank and an atmospheric pressure slag sealing method. Background Technology

[0002] There are several methods for treating steel slag, including hot pouring, hot quenching, water quenching, air quenching, drum granulation, and granulation wheel methods. Hot pouring involves pouring molten steel slag into a hot pouring area, cooling it naturally with water or air, and then crushing and magnetically separating it. Hot quenching involves pouring molten steel slag into a hot quenching tank, cooling it with water, and then crushing and magnetically separating it after it has been pulverized. Water quenching involves using high-pressure water to cool and crush the molten steel slag into particles while pouring it. Air quenching is similar to water quenching, but it uses high-pressure air to cool and crush the molten steel slag into particles.

[0003] Hot pouring is inefficient and pollutes the environment when processing steel slag. Hot quenching, water quenching, and air quenching use forced cooling with air or water, which is more efficient. However, hot quenching and water quenching may cause explosions because water comes into direct contact with molten steel slag. Although air quenching uses forced cooling and crushing with air, it consumes a lot of compressed air and generates a lot of noise.

[0004] The drum method involves pouring liquefied steel slag into a slag pot, which is then transported by slag pot truck to the drum slag processing room. A crane then lifts the slag pot to the drum slag inlet and pours the slag into the drum. Inside the drum, the liquefied steel slag undergoes simultaneous water cooling, solidification, and crushing before being discharged to the slag yard via a plate conveyor. This process has the following problems: low steel slag processing rate, generally below 50%, resulting in a large amount of dry slag discharge; high energy consumption of the system equipment; high equipment failure rate; and large investment; the steel slag is difficult to crush and granulate, causing severe wear on the equipment, requiring frequent replacement of the internal steel balls.

[0005] Another method is hot pressing, such as the patent with authorization announcement number CN105063255B, which uses the residual heat of steel slag to spray water on the steel slag in a closed pressure vessel. This method does not consume external energy, does not generate dust, and is highly efficient, energy-saving, and environmentally friendly. However, there is a contradiction in the contact between water and molten steel slag during the process. If too little water is sprayed, the cooling effect will be poor. If a large amount of water is sprayed, a large amount of water vapor will be generated, forming high pressure and causing operational risks.

[0006] In summary, existing methods for slag sealing all have inherent defects, and there is an urgent need to provide a better slag sealing device and method. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide an atmospheric pressure slag tank that can achieve slag sludge treatment and hot gas treatment without pressure safety risks, and without generating wastewater or waste gas.

[0008] To solve the above-mentioned technical problems, the technical solution of the present invention is: an atmospheric pressure slag tank, comprising: Barrel body; A coil passes through the top wall of the barrel, forming an inner coil and an outer coil. The inner coil spirals upward from the middle of the barrel along the inner wall of the barrel, and the diameter gradually decreases, with a notch at the smallest diameter position. The outer coil extends downward outside the barrel and the diameter gradually increases. A water storage jacket is provided on the outer peripheral wall of the lower end of the barrel body, and its top wall is connected to an upwardly extending balance pipe. The lower end of the outer coil of the barrel is connected to the water storage jacket. A water pump, connected to the lower end of the water storage jacket and the inner coil of the tank, is used to pump water from the water storage jacket into the inner coil of the tank.

[0009] Furthermore, in order to allow hot air to enter the coil more smoothly and to blow in a small amount of cold air along with it, the atmospheric pressure slag tank also includes a one-way impeller that is rotatably installed at the upper end of the tank body. The one-way impeller is passively rotated under the impact of the falling steel slag and the impact of the upward-sprayed hot air to send hot air into the opening.

[0010] Furthermore, in order to allow more air to enter the coil, a gas collection hood is provided at the notch.

[0011] Furthermore, the inner diameter of the barrel gradually decreases from the middle to the top and bottom ends.

[0012] Furthermore, the balancing tube extends upwards to be flush with the top of the barrel.

[0013] Furthermore, the external coil of the tank is connected to the side of the water storage jacket away from the water pump.

[0014] Furthermore, in order to allow the gas to escape more quickly, the balance pipe is connected to the top wall of the water storage jacket near the outlet of the outer coil.

[0015] Furthermore, the water volume in the water storage jacket is configured to absorb the heat released by the cooling of the steel slag added into the tank without boiling.

[0016] Furthermore, the water pump is a submersible pump located inside the water storage jacket, and its outlet is connected to the lower end of the coil inside the tank.

[0017] This invention also relates to an atmospheric pressure slag-sealing method, comprising: Start the water pump and add steel slag into the tank; Water in the water storage jacket enters the inner coil of the tank under the action of the water pump, and flows upward along the inner coil to cool the inside of the tank. As the diameter of the coil inside the barrel decreases, the opening draws hot air from the top of the barrel into the coil for heat exchange, thus cooling the steel slag. Water in the inner coil returns to the water storage jacket along the outer coil, while gas escapes through the balance pipe after being washed and cooled by water.

[0018] By adopting the above technical solution, the present invention has the following beneficial effects: This invention designs the inner coil of the slag-cooling system as spiraling upwards with a gradually decreasing diameter, while the outer coil has a gradually increasing diameter from top to bottom. This design not only enables water cooling of the slag within the inner coil but also allows hot air to be drawn into the coil through the narrowest opening using a venturi system. This facilitates direct heat exchange between the cooling water and the hot air, directly cooling the gas and allowing for gas washing. Thus, hot air can be treated simultaneously with slag cooling, without generating waste gas or environmental pollution. Furthermore, this invention uses atmospheric pressure slag cooling, eliminating pressure requirements on the equipment and reducing manufacturing costs. There are also no pressure safety risks during the slag cooling process. Additionally, this invention uses water to cool the steel slag, but the water does not come into contact with the slag, thus avoiding water consumption and wastewater generation, further reducing costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the internal structure of the atmospheric pressure slag tank of the present invention; Figure 2 This is a schematic diagram of the external structure of the atmospheric pressure slag tank of the present invention; In the diagram, 1 is the barrel body; 2 is the coil; 21 is the inner coil of the barrel; 211 is the notch; 22 is the outer coil of the barrel; 3 is the water storage jacket; 4 is the balance pipe; 5 is the water pump; 6 is the gas collection hood; 7 is the one-way impeller; 8 is the feed inlet; and 9 is the steel slag. Detailed Implementation

[0020] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0021] like Figure 1 and Figure 2 As shown, an atmospheric pressure slag tank includes: Barrel 1; Coil 2 passes through the top wall of the barrel 1 to form an inner coil 21 and an outer coil 22. The inner coil 21 spirals upward along the inner wall of the barrel 1 from the middle position and the diameter gradually decreases. A notch 211 is provided at the position with the smallest diameter. The outer coil 22 extends downward outside the barrel 1 and the diameter gradually increases. A water storage jacket 3 is set on the outer peripheral wall of the lower end of the tank body 1, and its top wall is connected to an upwardly extending balance pipe 4. The lower end of the outer coil 22 is connected to the water storage jacket 3. Water pump 5 connects the lower end of water storage jacket 3 and inner coil 21 of the tank, and is used to pump water from water storage jacket 3 into inner coil 21 of the tank.

[0022] The water pump 5 can be a submersible pump, located inside the water storage jacket 3, with its outlet connected to the lower opening of the coil 21 inside the tank. Alternatively, the water pump 5 can be located outside the water storage jacket 3, with its inlet connected to the water storage jacket 3 and its outlet connected to the lower opening of the coil 21 inside the tank.

[0023] In this embodiment, considering that the heat at the lower end of the tank 1 can be directly transferred to the water storage jacket 3, the coil 21 inside the tank is arranged to spiral upwards from the middle of the tank 1 along the inner wall of the tank 1, so that the top of the water storage jacket 3 is basically level with the bottom of the coil 21 inside the tank. In this way, the space occupied inside the tank 1 can be minimized and the amount of coil 2 used can be saved.

[0024] The atmospheric pressure slag-sealing method based on the atmospheric pressure slag-sealing tank in this embodiment includes: Start water pump 5 and add steel slag 9 into barrel 1. The steel slag 9 can be piled up to the middle height inside barrel 1. Water in the water storage jacket 3 enters the inner coil 21 of the tank under the action of the water pump 5, and flows upward along the inner coil 21 to cool the inside of the tank 1. As the diameter of the coil 21 inside the barrel decreases, the notch 211 draws hot air from the top of the barrel 1 into the coil 2 for heat exchange, thus cooling the steel slag 9. Water in the inner coil 21 returns to the water storage jacket 3 along the outer coil 22, and gas escapes through the balance pipe 4 after being washed and cooled by water.

[0025] The water volume in the water storage jacket 3 is configured to be twice as large as the water volume that can be heated to 50°C by the heat released by the cooling of the steel slag 9, so that the heat can be completely absorbed by the water without boiling.

[0026] In this embodiment, the inner coil 22 is configured to spiral upwards with a gradually decreasing diameter, while the outer coil 22 is configured to gradually increase in diameter from top to bottom. This not only enables water cooling and slag curing through the cooling water inside the inner coil 22, but also allows hot air to be drawn into the coil 2 through the narrowest opening 211 using a venturi, enabling direct heat exchange between the cooling water and hot air, directly cooling the gas and washing it with water. Thus, hot air can be treated simultaneously during slag curing without producing waste gas or polluting the environment. Furthermore, this embodiment uses atmospheric pressure slag curing, eliminating pressure requirements on the equipment, reducing manufacturing costs, and eliminating pressure safety risks during the slag curing process. Additionally, this embodiment uses water to cool the steel slag 9, but the water does not come into contact with the steel slag 9, thus avoiding water consumption and wastewater generation, further reducing costs.

[0027] In this embodiment, as Figure 1 As shown, preferably, the atmospheric pressure slag tank also includes a one-way impeller 7 rotatably mounted inside the upper part of the tank body 1. (Because there are requirements for the rotation direction of the one-way impeller 7, the one-way impeller 7 is structurally configured to rotate only in a predetermined direction, such as through ratchet and pawl engagement, one-way bearing, etc.) Figure 1 As shown, with the notch 211 located to the right of the inner coil 21 inside the barrel 1, in order for the one-way impeller 7 located to the left of the notch to deliver hot air into the notch 211 from bottom to top, the one-way impeller 7 needs to be structurally configured to rotate only counterclockwise.

[0028] Steel slag 9 is poured into the barrel 1 through the feed inlet 8. During its descent, it drives the one-way impeller 7 to rotate in one direction. The hot air sprayed upwards from inside the barrel 1 also drives the one-way impeller 7 to rotate in the same direction. As the one-way impeller 7 rotates in its predetermined direction, it carries the hot air below the notch 211 inside the barrel 1 to the notch 211 position, while simultaneously blowing cold air from above the barrel 1 into the barrel 1. In other words, the function of the one-way impeller 7 is twofold: firstly, to ensure that the hot air reaches the notch 211 smoothly, and secondly, to simultaneously blow a small amount of cold air into the barrel 1.

[0029] like Figure 1 As shown, in order to better drive the one-way impeller 7 to rotate in the predetermined direction, the top of the barrel 1 is provided with a feed inlet 8. The outlet of the feed inlet 8 is exactly opposite to the half of the one-way impeller 7 away from the notch 211. In this way, more of the gravitational potential energy of the steel slag 9 can be effectively utilized, and the damage to the one-way impeller 7 can be avoided by forcing the one-way impeller 7 to rotate in a direction that cannot be rotated due to some steel slag 9 falling to the right side of the one-way impeller 7.

[0030] In this embodiment, as Figure 1 As shown, preferably, a gas collection hood 6 is provided at the notch 211.

[0031] Specifically, by collecting and guiding the air through the air collection hood 6, more air can enter the coil 2 through the gap 211.

[0032] In this embodiment, as Figure 1 As shown, preferably, the inner diameter of the barrel 1 gradually decreases from the middle to the top and bottom, that is, the top and bottom of the barrel 1 are thinner and the middle is relatively thicker.

[0033] Considering that the water storage jacket 3 is located at the lower end of the tank body 1, this arrangement can maximize the volume of the water storage jacket 3 while ensuring the stability of the tank body 1, so that the water storage jacket 3 can hold as much water as possible.

[0034] In this embodiment, as Figure 1 and Figure 2 As shown, preferably, the balance tube 4 extends upward to be flush with the top of the barrel 1.

[0035] In this embodiment, as Figure 1 As shown, preferably, the outer coil 22 of the tank is connected to the side of the water storage jacket 3 away from the water pump 5.

[0036] In this embodiment, as Figure 1 As shown, preferably, the balance pipe 4 is connected to the top wall of the water storage jacket 3 near the outlet of the outer coil 22. In this way, the gas after washing and cooling can quickly enter the balance pipe 4 and escape.

[0037] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An atmospheric pressure slag septic tank, characterized in that, include: Barrel body (1); A coil (2) passes through the top wall of the barrel (1) to form an inner coil (21) and an outer coil (22). The inner coil (21) spirals upward from the middle of the barrel (1) along the inner wall of the barrel (1) and the diameter gradually decreases. A notch (211) is provided at the position with the smallest diameter. The outer coil (22) extends downward outside the barrel (1) and the diameter gradually increases. A water storage jacket (3) is provided on the outer peripheral wall of the lower end of the barrel (1), and its top wall is connected to an upwardly extending balance pipe (4). The lower end of the outer coil (22) of the barrel is connected to the water storage jacket (3). A water pump (5) is connected to the lower end of the water storage jacket (3) and the inner coil (21) of the bucket, and is used to pump water from the water storage jacket (3) into the inner coil (21).

2. The atmospheric pressure slag trap according to claim 1, characterized in that, It also includes a one-way impeller (7) that is rotatably installed at the upper end of the barrel (1). The one-way impeller (7) is passively rotated under the impact of falling steel slag (9) and the impact of upward sprayed hot air, so as to send hot air into the notch (211).

3. The atmospheric pressure slag trap according to claim 1 or 2, characterized in that, A gas collection hood (6) is provided at the notch (211).

4. The atmospheric pressure slag trap according to claim 1, characterized in that, The inner diameter of the barrel (1) gradually decreases from the middle to the top and bottom ends.

5. The atmospheric pressure slag septic tank according to claim 1, characterized in that, The balance tube (4) extends upward to be flush with the top of the barrel (1).

6. The atmospheric pressure slag trap according to claim 1, characterized in that, The external coil (22) of the bucket is connected to the side of the water storage jacket (3) away from the water pump (5).

7. The atmospheric pressure slag tank according to claim 6, characterized in that, The balance pipe (4) is connected to the top wall of the water storage jacket (3) near the outlet of the outer coil (22).

8. The atmospheric pressure slag tank according to claim 1, characterized in that, The water volume in the water storage jacket (3) is configured to absorb the heat released by the cooling of the steel slag (9) added to the barrel (1) without boiling.

9. The atmospheric pressure slag trap according to claim 1, characterized in that, The water pump (5) is a submersible pump located inside the water storage jacket (3), and its outlet is connected to the lower end of the inner coil (21) of the bucket.

10. An atmospheric pressure slag-sealing method based on the atmospheric pressure slag-sealing tank according to any one of claims 1-9, characterized in that, include: Start the water pump (5) and add steel slag (9) into the barrel (1); Water in the water storage jacket (3) enters the inner coil (21) of the tank under the action of the water pump (5), and flows upward along the inner coil (21) to cool the inside of the tank (1); As the diameter of the coil (21) inside the barrel decreases, the notch (211) draws hot air from the top of the barrel (1) into the coil (2) for heat exchange, thus cooling the steel slag (9). Water in the inner coil (21) returns to the water storage jacket (3) along the outer coil (22), and gas escapes through the balance pipe (4) after being washed and cooled by water.

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