Furnace bottom air leakage treatment device and method for dry slag machine of power station boiler

Abstract

The invention discloses a boiler bottom air leakage treatment device and method for a power station boiler dry slag machine, and particularly relates to the field of energy conservation and emission reduction of power station boilers, the boiler bottom air leakage treatment device comprises a dry slag machine body, and boiler bottom air leakage is led out through a cooling air discharge connector, a boiler bottom air leakage discharge connector and a machine tail air leakage discharge connector; a connecting pipe; an air feeder I and an air feeder II; a booster fan; a secondary air box outlet; a slag bin and a slag discharging chamber; and a transition slag hopper. According to the device and method for treating furnace bottom air leakage of the power station boiler slag dryer, through redesign of a traditional mode that cooling air of the slag dryer enters a hearth, the problem that the cooling air of the slag dryer completing heat exchange with furnace bottom slag directly enters the hearth from the furnace bottom as furnace bottom air leakage to disturb combustion is solved; cooling air of the slag drying machine is changed from disordered furnace bottom air leakage into ordered air of secondary air organization, the combustion stability of a hearth can be effectively improved, the smoke exhaust temperature is reduced, and the carbon content of fly ash combustible materials is reduced, so that the boiler efficiency is improved, and the coal consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the field of energy conservation and emission reduction of power station boilers, and in particular to a device and method for treating air leakage from the bottom of a slag dryer of a power station boiler. Background Art

[0002] In recent years, dry slag discharge systems have become widely used in boilers. In this system, the large slag that enters the cold ash hopper must be fully cooled to ensure that it does not coke or overheat after cooling before entering the slag bin. However, the cooled air is converted into hot air and enters the furnace directly from the bottom. For the furnace, this air is considered unorganized cold air. Once entering the furnace, it lowers the furnace temperature, shifts the flame center upward, and increases the flue gas temperature at the furnace outlet. Under high load conditions, if the furnace leaks a lot of air, the superheater will face the risk of overheating. Under low load conditions, large air leaks can cause unstable combustion, increase in incomplete combustion losses, and even cause fire extinguishing. In addition, a large increase in air leakage from the furnace bottom increases the oxygen content in the main combustion zone, leading to increased NOx concentrations at the furnace outlet.

[0003] Chinese patent document CN119393780A discloses a system and method for treating air leakage from the bottom of a dry slag removal furnace of a pulverized coal-fired power plant boiler, which relates to the technical field of dry slag removal of power plant boilers. The main purpose is to reduce the entry of unorganized cold air into the furnace, reduce the adverse effects on the furnace temperature, make the combustion process more stable, and improve combustion efficiency. The main technical solution of the present invention is as follows: the system for treating air leakage from the bottom of a dry slag removal furnace of a pulverized coal-fired power plant boiler comprises a cold ash hopper, a slag discharge box, and an exhaust and intake device. The slag discharge box is provided with a dry slag conveyor belt, and a slag drop port is provided on the slag discharge box at a position relative to the cold ash hopper. The slag drop port is provided with exhaust ports on both sides of the dry slag conveyor belt along the length direction. The exhaust ports are connected to the exhaust and intake device through a connecting air duct. The connecting air duct is provided with an on-off valve, and the opening of the on-off valve is adjustable.

[0004] However, this device only discharges the leaked air through the connecting air duct via the suction and exhaust device, resulting in heat waste and failing to improve the thermal efficiency of the boiler. Summary of the Invention

[0005] The main purpose of the present invention is to provide a device and method for treating air leakage from the bottom of a dry slag machine of a power station boiler, which can effectively solve the problem of heat waste and inability to improve the thermal efficiency of the boiler.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A device for treating bottom air leakage of a slag dryer for a power station boiler comprises: a slag dryer body, wherein bottom air leakage is led out through a cooling air exhaust interface, a bottom air leakage exhaust interface, and a tail air leakage exhaust interface;

[0008] Communication pipe, used to connect dust collector 1 and dust collector 2;

[0009] Air supply fan 1, air supply fan 2 and the secondary air box 1 and 2 at their outlets, and the large secondary air annular air box 1 and 2 on both sides;

[0010] Booster fan and its inlet and outlet shut-off doors;

[0011] Secondary air box shut-off door 1 and 2 at the secondary air box outlet and secondary air annular air box shut-off door 1 and 2 at the secondary air box inlet;

[0012] The slag bin, slag discharge room, and the cooling air inlet of the dry slag machine body are also equipped with an adjustment door 1, and the interior of the slag discharge room is equipped with a negative pressure regulating door;

[0013] The transition slag hopper is arranged between the dry slag machine body and the connecting pipe. It is used to receive the slag discharged from the dry slag machine body and guide it to the subsequent processing process. Its bottom is connected to the dry slag machine steel belt conveyor system, and the top is connected to the leakage collection path of the connecting pipe through an interface to achieve the initial separation of slag and leakage air.

[0014] Preferably, the bottom of the dust collector is provided with a first air lock, a second air lock, and a slag falling pipe in sequence from top to bottom, and the bottom of the slag falling pipe is connected to the dry slag machine body.

[0015] Preferably, the first air lock and the second air lock are arranged in series to prevent the cooling air of the dry slag machine body from short-circuiting and to achieve continuous discharge of the slag separated by the dust collector into the slag drop pipe.

[0016] Preferably, the cooling air adjustment door of the slag dryer is installed on the top of the slag dryer, and the cooling air volume entering the slag dryer is adjusted in real time according to the change of the slag temperature at the furnace bottom.

[0017] Preferably, multiple dust collectors 1 and 2 are provided according to the capacity of the unit, and their inlets are connected to the slag discharge room through a connecting pipe, and three-stage dust removal and anti-wear treatment are adopted inside.

[0018] Preferably, the adjustment door adjusts the cooling air volume in the slag dryer body in real time according to the change of the furnace bottom slag temperature.

[0019] Preferably, the adjustment door is installed on the top of the slag dryer, and can adjust the cooling air volume entering the slag dryer body in real time according to the slag temperature at the bottom of the furnace; the negative pressure adjustment door is arranged in the slag discharge room, and is used to form negative pressure when discharging slag in the slag bin to suppress dust.

[0020] The present invention also discloses a method for treating the bottom air leakage of a slag dryer using the above-mentioned device for treating the bottom air leakage of a slag dryer in a power station boiler. The specific steps are as follows:

[0021] A. Leakage air collection and dust removal: The air leakage from the bottom of the dry slag machine is collected into the communication pipe through the interface of the dry slag machine body, the cooling air exhaust interface, and the bottom leakage air exhaust interface, and then passes through the dust collector 1 and the dust collector 2 to efficiently separate the ash particles;

[0022] B. Heat recovery and reuse: The leaked air after dust removal is pressurized by the booster fan, switched to be sent to the secondary air box 1 and secondary air box 2 to mix with the cold secondary air, and then heated by the air preheater and sent to the furnace as hot secondary air, or sent to the secondary air annular large air box 1 and secondary air annular large air box 2 to blow away the accumulated dust;

[0023] C. Slag discharge and sealing: The slag separated by the dust collector returns to the dry slag machine through the first air lock, the second air lock and the slag drop pipe, and is transported to the slag bin by the steel belt. At the same time, the air lock is used to prevent cooling air leakage;

[0024] D. Dynamic adjustment of air volume: According to the slag temperature at the furnace bottom, adjust the cooling air volume of the slag dryer by adjusting door 1; when discharging slag, open the negative pressure adjustment door to use negative pressure to suppress dust in the slag bin.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention uses a three-stage dust removal structure (cyclone dust removal + filtering dust removal + electrostatic dust removal) of dust collector 1 and dust collector 2 to reduce the dust concentration of the furnace bottom leakage air to below the environmental protection standard, thereby reducing the wear and dust pollution of the booster fan; the leakage air after dust removal is pressurized by the booster fan, and can be switched to the secondary air box to be mixed with the cold secondary air for heating and then sent into the furnace, realizing heat recovery and utilization to improve the thermal efficiency of the boiler, or switched to the secondary air annular large air box to blow away the accumulated dust, reducing the workload of maintenance and cleaning, and achieving both energy efficiency improvement and environmental benefits.

[0027] 2. The present invention adopts a double-layer flap counterweight structure with a first air lock and a second air lock in series, which can prevent the cooling air of the dry slag machine from short-circuiting while achieving continuous discharge of slag, thereby enhancing the sealing of the system and suppressing dust leakage; the cooling air adjustment door on the top of the dry slag machine is linked with the slag temperature sensor at the bottom of the furnace, and can adjust the cooling air volume in real time to accurately control the heat exchange efficiency. The negative pressure adjustment door in the slag discharge room is linked with the slag bin slag discharge signal, and negative pressure is automatically generated during slag discharge to suppress dust. Through dynamic sealing and intelligent adjustment, the system operation stability and environmental protection requirements are guaranteed.

[0028] 3. The present invention redesigns the traditional way in which the cooling air of the slag dryer enters the furnace, thereby solving the problem of the cooling air of the slag dryer, which completes heat exchange with the bottom slag, entering the furnace directly from the furnace bottom as leakage air, causing disturbance to combustion. The cooling air of the slag dryer is transformed from disordered bottom leakage air to orderly air organized by secondary air, which can effectively improve the stability of furnace combustion, reduce the exhaust gas temperature, reduce the carbon content of combustible matter in fly ash, and reduce the amount of desuperheating water, thereby improving boiler efficiency and reducing coal consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0030] In the figure: 1. Dry slag machine body; 2. Cooling air exhaust interface; 3. Bottom air leakage exhaust interface; 4. Tail air leakage exhaust interface; 5. Communication pipe; 6. Transition slag hopper; 7. Dust collector 1; 8. Dust collector 2; 9. First air lock; 10. Second air lock; 11. Slag drop pipe; 12. Booster fan; 13. Inlet shut-off door; 14. Outlet shut-off door; 15. Secondary air box shut-off door 1; 16. Secondary air box shut-off door 2; 17. Secondary air box 1; 18. Secondary air box 2; 19. Secondary air ring bellows shut-off door 1; 20. Secondary air ring bellows shut-off door 2; 21. Supply air fan 1; 22. Supply air fan 2; 23. Secondary air ring bellows 1; 24. Secondary air ring bellows 2; 25. Adjustment door 1; 26. Negative pressure adjustment door; 27. Slag bin; 28. Slag discharge room. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0032] Example 1

[0033] like Figure 1 As shown, a device for treating bottom air leakage from a power station boiler slag dryer comprises a slag dryer body 1, a cooling air discharge port 2, a bottom air leakage discharge port 3, and a tail air leakage discharge port 4. These are connected via a connecting pipe 5 to a dust collector 1 7 and a dust collector 2 8, respectively. The bottoms of dust collectors 1 7 and 2 8 are connected to a first air lock 9 and a second air lock 10, respectively. The bottom of the second air lock 10 is connected to a slag drop pipe 11, which is in communication with the slag dryer body 1. The efficient separation of dust collectors 1 7 and 2 8 effectively reduces ash particles carried in the discharged bottom air leakage, minimizing wear on the booster fan 12.

[0034] The booster fan 12 is equipped with an inlet shutoff door 13 at its inlet and an outlet shutoff door 14 at its outlet. Both are electrically operated gates and are linked to the booster fan control system. When the booster fan 12 is started, stopped, or fails, the inlet and outlet shutoff doors 13 and 14 automatically close, cutting off the air leakage path and preventing backflow or system pressure fluctuations from affecting boiler operation.

[0035] Inlet shut-off door 13: installed on the communication pipe 5 between the booster fan 12 and the dust collector 1 7 and the dust collector 2 8, used to isolate the booster fan 12 from the dust removal system.

[0036] Outlet shut-off door 14: installed on the connecting pipe 5 between the booster fan 12 and the secondary air box / annular large air box, to control the transmission path of leaked air to the secondary air system.

[0037] Secondly, the bottoms of dust collectors 1 (7) and 2 (8) are connected by a first air lock (9) and a second air lock (10). These two air locks are cleverly combined to achieve continuous and efficient discharge of the slag separated by the dust collectors. The two air locks prevent short-circuiting of the cooling air within the dryer, allowing for smoother airflow within the dust collector and further enhancing dust removal. Furthermore, the separated slag is discharged into the dryer body (1) via a slag drop pipe (11), where it is carried by a steel belt to the slag bin (27), preventing environmental pollution caused by slag scattering and making the entire system simple, safe, and reliable.

[0038] At the same time, the air lock can effectively prevent the leakage of dust generated by the slag during its fall, reducing environmental pollution. The provision of the first air lock 9 and the second air lock 10 forms a double guarantee, further improving the sealing and environmental protection of the system. In addition, the design of the air lock also takes into account the smooth discharge of the slag. Through the rational structure and material selection, the air lock can ensure that the slag can fall smoothly while ensuring sealing, without causing blockage or accumulation.

[0039] Reference Figure 1 The tops of the dust collector 7 and the dust collector 2 8 are connected with a booster fan 12 through a connecting pipe 5. The outlet of the booster fan 12 sends the furnace bottom leakage air evenly into the secondary air box 1 17 and the secondary air box 2 18 through the connecting pipe 5, and the furnace bottom leakage air is sent in and mixed with the secondary air. This design not only realizes the effective recovery and reuse of heat, but also improves the thermal efficiency of the entire system and reduces energy waste.

[0040] Moreover, the secondary air can enter the furnace in a controllable manner to solve the disturbance of furnace combustion caused by air leakage from the furnace bottom. Moreover, during operation, the air leakage from the furnace bottom can be switched to the secondary air annular bellows shut-off door 19 and the secondary air annular bellows shut-off door 2 20 at any time to blow up the dust accumulated at the bottom of the large annular bellows and send it into the furnace together with the secondary air to prevent dust accumulation at the bottom of the large annular bellows, saving time and cost in cleaning the dust during maintenance.

[0041] The air leakage from the furnace bottom after separation by dust collector 1 7 and dust collector 2 8 is close to environmentally friendly emissions, so it is sent to the booster fan 12 to ensure its safe and long-term stable operation, and also provide a strong guarantee for the continuity and stability of the boiler slag discharge process, making the operation of the entire transformation system more efficient and environmentally friendly.

[0042] The air preheater is a crucial component in a power plant boiler system. Its primary function is to utilize the heat from the flue gas at the boiler's exhaust to preheat the air entering the boiler. This preheated air aids the combustion process, improving the boiler's combustion efficiency and contributing to energy conservation and emissions reduction. The air leaking from the furnace bottom is fed into the preheater's secondary airboxes 17 and 2, 18, where it mixes with the cold secondary air before entering the air preheater for heating.

[0043] Slag discharged from the slag dryer body 1 first falls into the transition hopper 6. Its internal guide plate design allows the slag to slide along the hopper wall and onto the slag dryer steel belt. Leakage air, on the other hand, enters the connecting pipe 5 through the vents at the top of the transition hopper 6, where it merges with the airflow from the cooling air outlet 2, the furnace bottom leakage air outlet 3, and the tail leakage air outlet 4. This design prevents slag and leakage air from mixing and entering the dust collector, reducing the dust collector's processing load. It also prevents large slag particles from clogging the connecting pipe 5, ensuring a smooth flow of leakage air collection.

[0044] Reference Figure 1 The processing capacity of dust collector 7 and dust collector 2 8 are designed in different sizes according to the different unit capacities, and they have undergone three-stage dust removal and internal anti-wear treatment, which means that they can effectively separate a large amount of dust-containing gas in the bottom air leakage according to different size designs, ensuring that the gas discharged into the atmosphere meets national or local environmental protection standards.

[0045] Because during the continuous operation of the transformation system, the dust collector needs to face the harsh working environment of high temperature and high dust content. Therefore, the efficient dust removal and wear-resistant treatment design ensures that the dust collector can operate stably for a long time in this harsh environment, providing reliable guarantee for the safe operation of the transformation system.

[0046] Example 2

[0047] This embodiment explains the treatment method of the bottom air leakage treatment device of the power station boiler slag dryer on the basis of the first embodiment.

[0048] A. Leakage air collection and dust removal

[0049] The cooling air and bottom leakage air after the dry slag machine body 1 completes the heat exchange with the bottom slag are orderly merged into the connecting pipe 5 through the cooling air exhaust interface 2, the bottom leakage air exhaust interface 3, and the tail leakage air exhaust interface 4 to form a mixed leakage air flow.

[0050] The mixed leakage air is diverted through the connecting pipe 5 to the dust collector 1 7 and the dust collector 2 8 arranged in parallel. The three-stage dust removal structure (cyclone dust removal + filtration dust removal + electrostatic dust removal) inside the dust collector is used to efficiently separate the dust particles carried in the air flow, reduce the dust concentration to below the environmental emission standard, and reduce the wear of the subsequent booster fan 12.

[0051] After heat exchange between the slag dryer body 1 and the bottom slag, the cooling air and the bottom leakage air are transported through the cooling air outlet 2, the bottom leakage air outlet 3, the tail leakage air outlet 4, and the vents on the top of the transition hopper 6, where they are combined into the connecting pipe 5 to form a mixed leakage airflow. The flow guidance structure of the transition hopper 6 ensures efficient separation of the slag and leakage air, allowing the leakage air to carry only a small amount of fine ash into the dust collector 1 7 and the dust collector 2 8, further improving dust removal efficiency.

[0052] B. Heat recovery and reuse

[0053] The clean leaked air after dust removal enters the booster fan 12 and is pressurized. After being pressurized, it passes through the outlet shut-off door 14 and the connecting pipe 5 and switches to two paths:

[0054] Path 1: Open the secondary air box shutoff door 15 and the secondary air box shutoff door 2 16, and send the leaked air into the secondary air box 1 17 and the secondary air box 2 18, where it is mixed with the cold secondary air output by the blower 1 21 and the blower 2 22. After being heated by the air preheater, it is sent into the furnace as hot secondary air, realizing heat recovery and participating in the combustion process, thereby improving the thermal efficiency of the boiler.

[0055] Path 2: Switch to the secondary air annular bellows shutoff door 19 and the secondary air annular bellows shutoff door 20, and send the leaked air into the secondary air annular large bellows 1 23 and the secondary air annular large bellows 2 24. The high-speed airflow sweeps away the dust accumulated at the bottom of the large bellows to prevent the dust deposition from affecting the operation of the equipment. The accumulated dust enters the furnace with the airflow for combustion, reducing the workload of maintenance and cleaning.

[0056] C. Slag discharge and sealing

[0057] The slag separated by the dust collector passes through the first air lock 9 and the second air lock 10 in series at the bottom of the dust collector, falls into the slag drop pipe 11 in sequence and returns to the slag dryer body 1, and is transported to the slag bin 27 by the slag dryer steel belt.

[0058] The air lock adopts a double-layer flap design, and the opening and closing of the flap is controlled by the counterweight to ensure the continuous discharge of slag materials while preventing the cooling air in the dry slag machine from flowing back into the dust collector through the slag drop pipe 11, avoiding air flow short circuit to damage the dust removal efficiency, and suppressing dust leakage.

[0059] D. Dynamic adjustment of air volume

[0060] Cooling air volume adjustment: The cooling air adjustment door 25 on the top of the slag dryer is linked to the slag temperature sensor at the furnace bottom. When the slag temperature is detected to rise, the adjustment door 25 will automatically open to increase the cooling air volume entering the slag dryer and enhance the heat exchange and cooling effect on the furnace bottom slag; when the slag temperature drops, the opening will be reduced to maintain the cooling air volume to match the actual demand.

[0061] Slag discharge dust control: When the slag bin 27 is discharging slag, the negative pressure regulating door 26 in the slag discharge room 28 is automatically opened, and a local negative pressure is formed by suction to suppress the dust generated during the slag discharge process and prevent dust from overflowing and polluting the environment.

[0062] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0063] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A device for treating air leakage from the bottom of a slag dryer in a power station boiler, characterized in that: include: The slag dryer body (1) has its bottom leakage air led out through the cooling air discharge interface (2), the bottom leakage air discharge interface (3), and the tail leakage air discharge interface (4); A communication pipe (5) for collecting dust collector 1 (7) and dust collector 2 (8); Blower 1 (21), blower 2 (22) and secondary air box 1 (17), secondary air box 2 (18) at their outlets and large secondary air annular air box 1 (23), large secondary air annular air box 2 (24) on both sides; A booster fan (12) and an inlet shutoff door (13) and an outlet shutoff door (14) at its inlet and outlet; Secondary air box shutoff door 1 (15), secondary air box shutoff door 2 (16) at the secondary air box outlet and secondary air annular air box shutoff door 1 (19), secondary air annular air box shutoff door 2 (20) at the secondary air box inlet; The slag bin (27), the slag discharge room (28), and the cooling air inlet of the slag dryer body (1) are also provided with an adjustment door (25), and the interior of the slag discharge room (28) is provided with a negative pressure regulating door (26); The transition slag hopper (6) is arranged between the dry slag machine body (1) and the connecting pipe (5) and is used to receive the slag material discharged from the dry slag machine body and guide it to the subsequent processing process. The bottom of the transition slag hopper is connected to the dry slag machine steel belt conveyor system, and the top is connected to the air leakage collection path of the connecting pipe (5) through an interface to achieve preliminary separation of the slag material and the air leakage.

2. The device for treating bottom air leakage of a power station boiler slag dryer according to claim 1, characterized in that: The bottom of the dust collector is provided with a first air lock (9), a second air lock (10), and a slag dropping pipe (11) in sequence from top to bottom, and the bottom of the slag dropping pipe (11) is connected to the slag drying machine body (1).

3. The device for treating air leakage from the bottom of a power station boiler slag dryer according to claim 1, characterized in that: The first air lock (9) and the second air lock (10) are arranged in series to prevent the cooling air of the slag dryer body (1) from short-circuiting, and to achieve continuous discharge of slag separated by the dust collector into the slag drop pipe (11).

4. The device for treating bottom air leakage of a power station boiler slag dryer according to claim 2, characterized in that: The cooling air adjustment door of the slag dryer is installed on the top of the slag dryer, and the cooling air volume entering the slag dryer is adjusted in real time according to the change of the slag temperature at the furnace bottom.

5. The device for treating bottom air leakage of a power station boiler slag dryer according to claim 2, characterized in that: The dust collector 1 (7) and the dust collector 2 (8) are provided in multiple units according to the unit capacity, and their inlets are connected to the slag discharge room (28) through the connecting pipe (5), and three-stage dust removal and anti-wear treatment are adopted inside.

6. The device for treating air leakage from the bottom of a slag dryer of a power station boiler according to claim 1, characterized in that: The adjustment door 1 (25) adjusts the cooling air volume in the slag dryer body (1) in real time according to the change of the furnace bottom slag temperature.

7. The device for treating air leakage from the bottom of a slag dryer of a power station boiler according to claim 1, characterized in that: The adjustment door (25) is installed on the top of the slag dryer and can adjust the cooling air volume entering the slag dryer body (1) in real time according to the slag temperature at the furnace bottom; the negative pressure adjustment door (26) is set in the slag discharge room (28) and is used to form a negative pressure when the slag bin (27) is discharged to suppress dust.

8. A method for treating air leakage from the bottom of a slag dryer of a power station boiler based on the device according to any one of claims 1 to 5, characterized in that: The following steps are involved: A. Leakage air collection and dust removal: The air leakage from the bottom of the slag dryer is collected into the communication pipe (5) through the interface of the slag dryer body (1), the cooling air exhaust interface (2), and the bottom leakage air exhaust interface (3), and then passes through the dust collector 1 (7) and the dust collector 2 (8) to efficiently separate the ash particles; B. Heat recovery and reuse: The leaked air after dust removal is pressurized by the booster fan (12), switched to be sent to the secondary air box 1 (17) and the secondary air box 2 (18) to mix with the cold secondary air, and then heated by the air preheater and sent to the furnace as hot secondary air, or sent to the secondary air annular large air box 1 (23) and the secondary air annular large air box 2 (24) to blow away the accumulated dust; C. Slag discharge and sealing: The slag separated by the dust collector returns to the slag dryer body (1) through the first air lock (9), the second air lock (10) and the slag drop pipe (11), and is transported to the slag bin (27) by the steel belt. At the same time, the air lock prevents the cooling air from leaking. D. Dynamic adjustment of air volume: According to the slag temperature at the bottom of the furnace, the cooling air volume of the slag dryer is adjusted by adjusting door 1 (25); when discharging slag, the negative pressure regulating door (26) is opened to suppress dust in the slag bin (27) by using negative pressure.

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