An entrained flow gasifier quench chamber with a draft tube and its usage method

Abstract

The present invention provides a quench chamber of a gasifier with a draft tube and a method for using the same. The quench chamber of the gasifier includes a housing. A downcomer is arranged inside the housing. A coaxial draft tube is sleeved outside the downcomer, and an annular gap is formed between the draft tube and the downcomer. One end of the downcomer is connected to the gasifier, and a gas distribution device is arranged at the other end. The gas distribution device is a conical section butt-jointed with the outer edge of the downcomer, and air holes are formed on the conical section. By arranging the draft tube, a liquid circulation is formed to prevent the deposition of fine coal ash particles, effectively solving the blockage problem caused by fine particles. By arranging the gas distribution device, small bubbles can be effectively formed, increasing the phase boundary area of the bubbles, greatly improving the effect of dust removal, ash removal and temperature reduction by water bath humidification, thereby reducing the excessive entrainment of coal ash in the syngas into the next process section.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal gasification equipment, and relates to a quench chamber of a gasifier and a using method thereof, in particular to a quench chamber of a gasifier with a draft tube and a using method thereof. Background Art

[0002] The coal gasification reaction and separation system is one of the core devices of coal chemical industry, and the clean coal gasification technology with high efficiency, low energy consumption and low pollution has been increasingly emphasized. The high-pressure and large-capacity entrained flow gasification technology is one of the advanced gasification technologies in the world and has been widely used in the coal chemical industry. The modern entrained flow gasification technology mainly includes water coal slurry gasification and pulverized coal gasification technologies, which have the advantages of less environmental pollution and high automation. In the entrained flow gasification technology, the raw coal gas and molten ash slag generated in the gasifier combustion chamber flow into the quench chamber in parallel for cooling and washing. The ash slag is discharged from the gasification black water and slag water discharging device after being quenched and washed in the water bath, and the raw coal gas enters the raw coal gas washing system after being cooled and washed. However, this process has problems such as low washing efficiency and ash slag accumulation in the washer, which affect the normal operation of the gasification device.

[0003] CN101935552A discloses a quench chamber assembly for a gasifier. The quench chamber is composed of components such as a quench ring, a downcomer, a riser and a separation baffle. The quench ring evenly distributes the quench water on the inner wall of the downcomer to form a liquid film, which protects the downcomer from being burned by high-temperature syngas and molten slag, and at the same time realizes the quenching and cooling of the high-temperature syngas. The riser and the downcomer are in a concentric shaft sleeve structure, and the downcomer is sleeved in the riser, so that the syngas first moves downward in the downcomer and then folds back into the upper region of the quench chamber through the annulus between the riser and the downcomer. Then, through the action of the baffle, gas-liquid separation is realized. In practice, due to the relatively large velocity of the gas leaving the liquid surface, it will cause fluctuations or oscillations in the flow, such as fluctuations in the slag water tank liquid level, gas flow rate and pressure.

[0004] CN102585914A discloses a gasification quench chamber and a washer assembly, including a reservoir having a liquid coolant disposed in its lower part and an upper part including an outlet for withdrawing cooled syngas therefrom; an immersion tube configured to introduce a syngas mixture to contact the liquid coolant to thereby produce the cooled syngas; a cooling device located in an annular space in the upper part between the outer surface of the immersion tube and the outer perimeter of the reservoir, the cooling device including heat exchanger tubes configured to further cool the cooled syngas in the upper part and increase the effective distance between the liquid coolant and the outlet; and a stability device located in the lower part configured to mitigate coolant level fluctuations and sloshing.

[0005] CN202688282U discloses a gasification furnace, comprising: a shell, which is provided with an air outlet; a combustion chamber, which is arranged in the shell; a quenching chamber, which is arranged in the shell and is located below the combustion chamber; the quenching chamber comprises a cavity and a funnel; a first end of the cavity is connected to the outlet of the combustion chamber, and the second end of the cavity is connected to the inlet of the funnel; a down pipe, the outlet of the funnel is connected to the first end of the down pipe; a quenching water nozzle, which is arranged on the inner wall of the cavity; a slag water pool, which is arranged in the shell and is located below the quenching chamber, and the second end of the down pipe is inserted below the liquid level of the slag water pool; a sealed annular cavity is formed between the shell and the quenching chamber, and the annular cavity is connected to the air outlet.

[0006] However, due to the large bubbles in the slag pool, it is easy to cause gas-to-liquid phenomenon, which will also cause liquid level fluctuations. At the same time, due to the weak liquid circulation in the slag pool, tiny particles are deposited and do not leave the system with the gasified black water in the quenching chamber designed for the gasifier, causing the bottom slag outlet and liquid level meter to be blocked. Summary of the invention

[0007] In view of the deficiencies in the prior art, the object of the present invention is to provide a gasifier quenching chamber containing a guide tube and a method for using the same. The present invention forms a liquid circulation by arranging a guide tube to prevent the deposition of fine coal ash particles, thereby effectively solving the blockage problem caused by fine particles; by arranging a gas distribution device, small bubbles can be effectively formed, the phase interface area of ​​the bubbles is increased, and the effect of water bath humidification, dust removal, ash removal and cooling is greatly improved, thereby reducing the amount of excessive coal ash entrained by the synthesis gas entering the next stage; in addition, the formation of small bubbles is conducive to preventing the fluctuations caused by super-large bubbles leaving the liquid surface and the engineering problems such as liquid level alarm jumping caused by them.

[0008] To achieve this object, the present invention adopts the following technical solutions:

[0009] In a first aspect, the present invention provides a gasifier quenching chamber containing a guide tube, wherein the gasifier quenching chamber comprises a shell, a down pipe is arranged inside the shell, a coaxial guide tube is sleeved on the outer side of the down pipe, and an annular gap is formed between the guide tube and the down pipe.

[0010] One end of the downcomer is connected to the gasifier, and the other end is provided with a gas distribution device. The gas distribution device is a conical section connected to the outer edge of the downcomer. The conical section is provided with air holes. The synthesis gas generated by the gasifier enters the downcomer and passes through the air holes on the conical section to be introduced into the annular gap. The diameter of the conical section gradually increases along the flow direction of the synthesis gas.

[0011] By setting up a gas distribution device, the present invention can effectively form small bubbles, increasing the phase boundary area of the bubbles and greatly improving the effect of humidifying, dedusting and cooling in the water bath, thereby reducing the excessive entrainment of coal ash in the syngas into the next process section. In addition, the formation of small bubbles is conducive to preventing engineering problems such as the fluctuations caused by the departure of super-large bubbles from the liquid surface and the resulting liquid level alarm and trip.

[0012] As a preferred technical solution of the present invention, quench water is injected into the quench chamber, and the draft tube is located below the liquid level of the quench water.

[0013] In the present invention, the draft tube is arranged below the liquid level of the quench water, which will form a circulation inside and outside the draft tube, making the small coal ash particles discharged from the gasifier in a suspended state and discharged from the quench chamber through the black water pipeline, which is conducive to solving the problem of blockage of the bottom slag discharge port and liquid level gauge by small particle coal ash. At the same time, the setting of the enlarged section at the top of the draft tube enables effective gas-liquid separation and suppresses the problem of water entrainment in the syngas.

[0014] As a preferred technical solution of the present invention, the air holes are arranged along the circumferential direction of the conical section.

[0015] Preferably, the air holes are circular, square, rectangular or annular.

[0016] Preferably, a deflector plate is arranged at the air holes.

[0017] In the present invention, welding a deflector plate at the outlet of the air hole can further suppress the phenomenon of water entrainment in the syngas.

[0018] As a preferred technical solution of the present invention, the gas outlet end of the draft tube is of a conical structure, and the syngas enters the annulus and is discharged from the gas outlet end of the draft tube.

[0019] Preferably, along the flow direction of the syngas, the diameter of the gas outlet end gradually increases.

[0020] As a preferred technical solution of the present invention, at least one annular baffle is arranged above the liquid level of the quench water.

[0021] Preferably, the annular baffle is arranged in the annular cavity formed between the shell and the downcomer.

[0022] Preferably, the annular baffles are staggered on the inner side wall of the shell and the outer peripheral surface of the downcomer.

[0023] In the present invention, staggering the annular baffles above the liquid level of the quench chamber can further suppress the phenomenon of water entrainment in the syngas.

[0024] As a preferred technical solution of the present invention, a quench ring is arranged at the connection between the downcomer and the gasifier, and the quench ring is used to spray quench water into the downcomer.

[0025] Preferably, nozzles are arranged on the quench ring, and the quench water forms a liquid film along the inner wall of the downcomer after being ejected from the nozzles.

[0026] Preferably, the quench ring is externally connected to a quench water supply pipeline.

[0027] In the present invention, the quench water forms a liquid film along the inner wall of the downcomer. The liquid film can protect the downcomer from being damaged by high-temperature synthesis gas and molten slag, and also has the effect of quenching and cooling.

[0028] As a preferred technical solution of the present invention, a slag discharge port is arranged at the bottom of the shell.

[0029] Preferably, an exhaust port is arranged at the top of the shell.

[0030] Preferably, the exhaust port is located above the annular baffle.

[0031] Preferably, a black water pipeline is arranged at the bottom of the shell.

[0032] In a second aspect, the present invention provides a method for using a quench chamber of a gasifier as described in the first aspect. The method for using includes:

[0033] The synthesis gas and molten slag generated by the gasifier enter the downcomer. Among them, after the synthesis gas enters the downcomer, it passes through the air holes on the conical section and is introduced into the annulus, and the molten slag settles and accumulates at the bottom of the quench chamber of the gasifier after entering the downcomer.

[0034] As a preferred technical solution of the present invention, the method for using specifically includes the following steps:

[0035] (Ⅰ) The synthesis gas and molten slag generated by the gasifier enter the downcomer, and at the same time, quench water is introduced into the quench ring. The quench water forms a liquid film along the inner wall of the downcomer after being ejected from the nozzles;

[0036] (Ⅱ) The synthesis gas passes through the downcomer, is dispersed into small bubbles through the air holes on the conical section and then enters the annulus. The bubbles pass through the annulus, are deflected by the staggered annular baffles, and are discharged from the exhaust port;

[0037] (Ⅲ) The molten slag settles and accumulates at the bottom of the quench chamber of the gasifier after passing through the downcomer, and is regularly discharged from the slag discharge port.

[0038] As a preferred technical solution of the present invention, step (Ⅱ) further includes: while the gas passes through the air holes, a flow guide plate arranged at the air holes performs bubble breaking treatment on the bubbles to further reduce the bubble size.

[0039] Preferably, step (Ⅲ) further includes: the fine particles in the molten slag are discharged through the black water pipeline.

[0040] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0041] The present invention adds a gas distribution device at the bottom end of the downcomer, reducing the bubble size entering the annulus between the downcomer and the draft tube, making the distribution of the syngas more uniform, increasing the contact area between the syngas and the liquid, greatly improving the water bath dust removal, ash removal and temperature reduction effect of the syngas, and avoiding excessive entrainment of coal ash into the subsequent process sections. At the same time, the draft tube will cause the liquid in the slag water tank to form a circulation, keeping the small particles in the tank in a suspended state, and thus preventing blockage of the bottom slag discharge port and the liquid level gauge of the device. Finally, the conical opening at the top of the draft tube will enable effective gas-liquid separation, significantly reducing entrainment of mist. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a schematic structural diagram of the quench chamber of the gasifier provided in Embodiment 1 of the present invention;

[0043] Figure 2 is a schematic structural diagram of the quench chamber of the gasifier provided in Embodiment 3 of the present invention;

[0044] Wherein, 1 - housing; 2 - downcomer; 3 - draft tube; 4 - black water pipeline; 5 - slag discharge port; 6 - exhaust port; 7 - quench ring; 8 - conical section; 9 - air hole; 10 - gas outlet end; 11 - gasifier; 12 - guide plate; 13 - annular baffle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] It should be noted that in the description of the present invention, unless otherwise clearly defined and limited, the terms "arranged", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0046] The technical solution of the present invention will be further described below with reference to the drawings and through specific embodiments.

[0047] In a specific embodiment, the present invention provides a quench chamber of a gasifier with a draft tube, and the quench chamber of the gasifier is as Figure 1 and Figure 2As shown in the figure, it includes a housing 1. Inside the housing 1, a downcomer 2 is arranged. A coaxial guide cylinder 3 is sleeved outside the downcomer 2, and an annular gap is formed between the guide cylinder 3 and the downcomer 2. One end of the downcomer 2 is connected to a gasifier 11, and the other end is provided with a gas distribution device. The gas distribution device is a conical section 8 butt-jointed with the outer edge of the downcomer 2. Air holes 9 are opened on the conical section 8. The syngas generated by the gasifier 11 enters the downcomer 2 and then is introduced into the annular gap through the air holes 9 on the conical section 8. The diameter of the conical section 8 gradually increases along the flow direction of the syngas.

[0048] Quench water is injected into the quench chamber, and the guide cylinder 3 is located below the liquid level of the quench water.

[0049] The air holes 9 are arranged along the circumferential direction of the conical section 8. The shape of the air holes 9 can be selected as circular, square, rectangular or annular. Further, as Figure 2 shown, a flow guide plate 12 is arranged at the air holes 9.

[0050] The gas outlet end 10 of the guide cylinder 3 is of a conical structure. After the syngas enters the annular gap, it is discharged from the gas outlet end 10 of the guide cylinder 3. Along the flow direction of the syngas, the diameter of the gas outlet end 10 gradually increases.

[0051] As Figure 2 shown, at least one annular baffle 13 is arranged above the liquid level of the quench water; the annular baffle 13 is arranged in the annular cavity formed between the housing 1 and the downcomer 2, and the annular baffle 13 is staggeredly arranged on the inner side wall of the housing 1 and the outer peripheral surface of the downcomer 2.

[0052] A quench ring 7 is arranged at the connection between the downcomer 2 and the gasifier 11. The quench ring 7 is used to spray quench water into the downcomer 2. Nozzles are arranged on the quench ring 7. After the quench water is sprayed out by the nozzles, it descends along the inner wall of the downcomer 2 to form a liquid film. The quench ring 7 is externally connected to a quench water supply pipeline.

[0053] A slag discharge port 5 is arranged at the bottom of the housing 1; an exhaust port 6 is arranged at the top of the housing 1, and the exhaust port 6 is located above the annular baffle 13; a black water pipeline 4 is arranged at the bottom of the housing 1.

[0054] Example 1

[0055] This embodiment provides a kind of as Figure 1The shown quench chamber of the gasifier includes a housing 1. Inside the housing 1, a downcomer 2 is provided, and a coaxial guide cylinder 3 is sleeved outside the downcomer 2. An annular gap is formed between the guide cylinder 3 and the downcomer 2. One end of the downcomer 2 is connected to the gasifier 11, and the other end is provided with a gas distribution device. The gas distribution device is a conical section 8 butt-jointed with the outer edge of the downcomer 2. Air holes 9 are opened on the conical section 8. The air holes 9 are arranged along the circumferential direction of the conical section 8, and the shape of the air holes 9 is circular. The syngas generated by the gasifier 11 enters the downcomer 2 and then passes through the air holes 9 on the conical section 8 and is introduced into the annular gap. The diameter of the conical section 8 gradually increases along the flow direction of the syngas.

[0056] Quench water is injected into the quench chamber, and the guide cylinder 3 is located below the liquid level of the quench water.

[0057] The gas outlet end 10 of the guide cylinder 3 is of a conical structure. After the syngas enters the annular gap, it is discharged from the gas outlet end 10 of the guide cylinder 3. Along the flow direction of the syngas, the diameter of the gas outlet end 10 gradually increases.

[0058] A quench ring 7 is arranged at the connection between the downcomer 2 and the gasifier 11. The quench ring 7 is used to spray quench water into the downcomer 2. Nozzles are arranged on the quench ring 7. After the quench water is sprayed out by the nozzles, it descends along the inner wall of the downcomer 2 to form a liquid film. The quench ring 7 is externally connected to a quench water supply pipeline.

[0059] A slag discharge port 5 is arranged at the bottom of the housing 1, and an exhaust port 6 is arranged at the top of the housing 1. The exhaust port 6 is located above the annular baffle 13; a black water pipeline 4 is arranged at the bottom of the housing 1.

[0060] Example 2

[0061] This embodiment provides a method for using the quench chamber of the gasifier described in Embodiment 1. The method specifically includes the following steps:

[0062] (Ⅰ) The syngas and molten slag generated by the gasifier 11 enter the downcomer 2. At the same time, quench water is introduced into the quench ring 7. After the quench water is sprayed out by the nozzles, it descends along the inner wall of the downcomer 2 to form a liquid film.

[0063] (Ⅱ) The syngas passes through the downcomer 2, is dispersed into small bubbles through the air holes 9 on the conical section 8, and then enters the annular gap. After the bubbles pass through the annular gap, they are discharged from the exhaust port 6.

[0064] (Ⅲ) The molten slag passes through the downcomer 2 and then settles and accumulates at the bottom of the quench chamber of the gasifier, and is regularly discharged from the slag discharge port 5. The fine particles in the molten slag are discharged through the black water pipeline 4.

[0065] Example 3

[0066] This embodiment provides a kind of as Figure 2The quench chamber of the gasifier shown includes a housing 1. Inside the housing 1, a downcomer 2 is provided. A coaxial guide cylinder 3 is sleeved outside the downcomer 2, and an annular gap is formed between the guide cylinder 3 and the downcomer 2. One end of the downcomer 2 is connected to the gasifier 11, and a gas distribution device is provided at the other end. The gas distribution device is a conical section 8 butt-jointed with the outer edge of the downcomer 2. Air holes 9 are formed on the conical section 8. The air holes 9 are arranged along the circumferential direction of the conical section 8. The shape of the air holes 9 is square, and a flow guide plate 12 is provided at the air holes 9. The synthesis gas generated by the gasifier 11 enters the downcomer 2 and then passes through the air holes 9 on the conical section 8 and is introduced into the annular gap. The diameter of the conical section 8 gradually increases along the flow direction of the synthesis gas.

[0067] Quench water is injected into the quench chamber. The guide cylinder 3 is located below the liquid level of the quench water. Three annular baffles 13 are provided above the liquid level of the quench water. The annular baffles 13 are arranged in the annular cavity formed between the housing 1 and the downcomer 2, and the annular baffles 13 are staggered on the inner side wall of the housing 1 and the outer peripheral surface of the downcomer 2.

[0068] The gas outlet end 10 of the guide cylinder 3 is of a conical structure. After the synthesis gas enters the annular gap, it is discharged from the gas outlet end 10 of the guide cylinder 3. Along the flow direction of the synthesis gas, the diameter of the gas outlet end 10 gradually increases.

[0069] A quench ring 7 is provided at the connection between the downcomer 2 and the gasifier 11. The quench ring 7 is used to spray quench water into the downcomer 2. Nozzles are provided on the quench ring 7. After the quench water is sprayed out by the nozzles, it descends along the inner wall of the downcomer 2 to form a liquid film. The quench ring 7 is externally connected to a quench water supply pipeline.

[0070] A slag discharge port 5 is provided at the bottom of the housing 1; an exhaust port 6 is provided at the top of the housing 1. The exhaust port 6 is located above the annular baffle 13; a black water pipeline 4 is provided at the bottom of the housing 1.

[0071] Example 4

[0072] This embodiment provides a method for using the quench chamber of the gasifier described in Embodiment 2. The method specifically includes the following steps:

[0073] (Ⅰ) The synthesis gas and molten slag generated by the gasifier 11 enter the downcomer 2. At the same time, quench water is introduced into the quench ring 7. After the quench water is sprayed out by the nozzles, it descends along the inner wall of the downcomer 2 to form a liquid film.

[0074] (Ⅱ) The synthesis gas passes through the downcomer 2, is dispersed into small bubbles through the air holes 9 on the conical section 8, and then enters the annular gap. While passing through the air holes 9, the flow guide plate 12 provided at the air holes 9 performs bubble-breaking treatment on the bubbles to further reduce the bubble size. The bubbles pass through the annular gap, are deflected by the staggered annular baffles 13, and are then discharged from the exhaust port 6.

[0075] (Ⅲ) The molten slag described above passes through the downcomer 2 and then settles and accumulates at the bottom of the quench chamber of the gasifier, and is regularly discharged through the slag discharge port 5. The fine particles in the molten slag are discharged through the black water pipeline 4.

[0076] The applicant declares that the above description is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by any person skilled in the art within the technical scope disclosed by the present invention fall within the protection scope and the disclosure scope of the present invention.

Claims

1. A gasification furnace quenching chamber containing a draft tube, It is characterized in that The gasification furnace quenching chamber comprises a shell, a downcomer is arranged inside the shell, a coaxial guide tube is sleeved on the outer side of the downcomer, and an annular gap is formed between the guide tube and the downcomer; The quenching water is injected into the quenching chamber, and the guide tube is located below the liquid level of the quenching water; One end of the downcomer is connected to the gasifier, and the other end is provided with a gas distribution device, which is a conical section connected to the outer edge of the downcomer, and the conical section is provided with air holes. After the synthesis gas generated by the gasifier enters the downcomer, it passes through the air holes on the conical section and is introduced into the annular gap. The diameter of the conical section gradually increases along the flow direction of the synthesis gas. The air holes are arranged along the circumference of the tapered section; A guide plate is arranged at the air hole; The gas outlet end of the guide tube is a conical structure, and the synthetic gas enters the annular gap and is discharged from the gas outlet end of the guide tube; At least one annular baffle is arranged above the liquid surface of the quenching water; The annular baffle is arranged in the annular cavity formed between the shell and the downcomer; A black water pipeline is arranged at the bottom of the shell.

2. The gasification furnace quenching chamber according to claim 1, It is characterized in that The air holes are circular, square, rectangular or ring-shaped.

3. The gasification furnace quenching chamber according to claim 1, It is characterized in that Along the flow direction of the synthesis gas, the diameter of the gas outlet end gradually increases.

4. The gasification furnace quenching chamber according to claim 1, It is characterized in that The annular baffles are arranged alternately on the inner side wall of the shell and the outer peripheral surface of the downcomer.

5. The gasification furnace quenching chamber according to claim 1, It is characterized in that A quenching ring is arranged at the connection between the downcomer and the gasifier, and the quenching ring is used to spray quenching water into the downcomer.

6. The gasification furnace quenching chamber according to claim 5, It is characterized in that The quenching ring is provided with a nozzle, and the quenching water is sprayed out from the nozzle and then descends along the inner wall of the descending pipe to form a liquid film.

7. The gasification furnace quenching chamber according to claim 5, It is characterized in that The quenching ring is externally connected to a quenching water supply pipeline.

8. The gasification furnace quenching chamber according to claim 1, It is characterized in that A slag discharge port is arranged at the bottom of the shell.

9. The gasification furnace quenching chamber according to claim 1, It is characterized in that An exhaust port is arranged on the top of the shell.

10. The gasification furnace quenching chamber according to claim 9, It is characterized in that The exhaust port is located above the annular baffle.

11. A method for using the gasification furnace quenching chamber according to any one of claims 1 to 10, It is characterized in that The method of use includes: The synthesis gas and slag produced by the gasifier enter the downcomer, wherein the synthesis gas enters the downcomer and is introduced into the annular gap through the air holes on the conical section, and the slag enters the downcomer and settles and accumulates at the bottom of the quenching chamber of the gasifier.

12. The method of use according to claim 11, It is characterized in that The method of use specifically comprises the following steps: (I) The synthesis gas and slag produced by the gasifier enter the downcomer, and quenching water is introduced into the quenching ring. The quenching water is sprayed out from the nozzle and descends along the inner wall of the downcomer to form a liquid film; (Ⅱ) The synthesis gas passes through the downcomer, is dispersed into small bubbles through the air holes on the conical section, and then enters the annulus. The bubbles pass through the annulus, are deflected by the staggered annular baffles, and are discharged through the exhaust port. (Ⅲ) The molten slag passes through the downcomer, settles and accumulates at the bottom of the quench chamber of the gasifier, and is periodically discharged through the slag discharge port.

13. According to the usage method described in claim 12, characterized in that in step (Ⅱ), while the gas passes through the air holes, a flow deflector arranged at the air holes performs bubble bursting treatment on the bubbles to further reduce the bubble size.

14. According to the usage method described in claim 12, characterized in that in step (Ⅲ), the fine particles in the molten slag are discharged through the black water pipeline.

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