Collaborative conveying device for waste heat boiler ash and quench tower particle ash

Abstract

The utility model relates to the technical field of incineration line equipment, and discloses a waste heat boiler ash and quench tower particle ash collaborative conveying device which comprises a waste heat boiler, a quench tower, a closed ash bin and a first scraper, the waste heat boiler is connected with the closed ash bin through the multi-stage ash discharging device, the quench tower is connected with a feeding port of the first scraper through the heavy hammer flap valve set, and a discharging port of the first scraper is connected with the multi-stage ash discharging device. According to the utility model, the negative pressure fluctuation at the outlet of the quench tower can be reduced during ash discharge, the local temperature of the quench tower can be prevented from being lower than the dew point temperature, and the ash discharge efficiency and the ash discharge effect are effectively improved.

Description

Technical Field

[0001] This utility model relates to the technical field of incineration line equipment, and in particular to a co-conveying device for waste heat boiler ash and quench tower particulate ash. Background Technology

[0002] The final disposal of hazardous waste mainly includes safe incineration, sanitary landfill, and marine disposal, among which incineration is the most effective final disposal technology. Incineration in an incinerator eliminates toxic and harmful organic components in hazardous waste, reducing its volume, and the heat generated can also be recovered and reused. However, attention must be paid to gas emissions during incineration, and exhaust gas treatment devices should be installed to avoid secondary pollution.

[0003] Currently, in the process of hazardous waste incineration, hazardous waste is mixed and then enters the rotary kiln and secondary combustion chamber. The high-temperature flue gas generated is recovered by the waste heat boiler and then enters the quench tower. The quench tower rapidly cools the high-temperature flue gas to prevent the resynthesis of harmful substances such as dioxins. At the same time, it removes acidic gases and heavy metal pollutants from the flue gas to avoid secondary pollution. The generated particulate ash falls onto the screw conveyor at the bottom of the quench tower. During ash discharge, the material is unloaded and the air is locked by the counterweight flap valve.

[0004] The existing technology has at least the following problems: The incineration line operates under negative pressure. The normal temperature of the quenching flue gas is about 200°C, and the dew point temperature of the flue gas is 180°C. When the quenching tower discharges ash, it directly discharges the ash into the open ash silo through the counterweight flap valve. When the counterweight flap valve is opened, cold air enters the quenching tower, causing the temperature of the flue gas above the counterweight flap valve to drop to about 170°C. At this time, the flue gas has dropped below the dew point temperature, which will cause local condensation. After dissolving the acidic and alkaline substances in the flue gas, it condenses into liquid. The liquid will combine with the particulate ash to form clumps, which will cause the counterweight flap valve to jam and leak air when unloading. In severe cases, the clumps of particulate ash will cause the screw conveyor shaft to jam or break. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by developing a collaborative conveying device for waste heat boiler ash and quench tower particulate ash. This invention can reduce the negative pressure fluctuation at the outlet of the quench tower during ash discharge and prevent the local temperature of the quench tower from falling below the dew point temperature, thus effectively improving the ash discharge efficiency and effect.

[0006] The technical solution of this utility model to solve the technical problem is as follows: a waste heat boiler ash and quench tower granular ash co-conveying device, including a waste heat boiler and a quench tower, wherein the exhaust port of the waste heat boiler is connected to the inlet of the quench tower through a gas transmission pipe, and further includes a sealed ash silo and a first scraper conveyor, wherein the waste heat boiler is connected to the sealed ash silo through a multi-stage ash discharge device, the quench tower is connected to the feed port of the first scraper conveyor through a counterweight flap valve group, and the discharge port of the first scraper conveyor is connected to the multi-stage ash discharge device.

[0007] As an optimization, a screw conveyor is installed at the bottom of the quench tower. The ash discharge port of the screw conveyor is connected to the feed port of the first scraper conveyor through a second ash discharge pipe. A counterweight flap valve assembly is installed on the second ash discharge pipe. By setting up the screw conveyor, the granular ash at the bottom of the quench tower can be transported into the second ash discharge pipe. The counterweight flap valve assembly can hold the granular ash. When the granular ash reaches a certain weight, the counterweight flap valve will open to discharge the material. After the discharge is completed, the counterweight flap valve will close under its own weight to lock the airflow.

[0008] As an optimization, the multi-stage ash removal device also includes a second scraper conveyor and a third scraper conveyor. The inlet of the second scraper conveyor is connected to the ash discharge port of the waste heat boiler, and the outlet of the second scraper conveyor is connected to the inlet of the third scraper conveyor through the first ash discharge pipe. The outlet of the third scraper conveyor is connected to the sealed ash silo. By setting up the second scraper conveyor, the ash and slag discharged from the waste heat boiler can be transported to the first ash discharge pipe, avoiding ash accumulation. By setting up the first ash discharge pipe and the third scraper conveyor, the ash and slag from the waste heat boiler and the particulate ash from the quench tower can be uniformly and collaboratively transported to the sealed ash silo.

[0009] As an optimization, the discharge port of the first scraper conveyor is connected to the first ash discharge pipe. This allows the particulate ash from the quench tower to be discharged to the third scraper conveyor.

[0010] As an optimization, the first, second, and third scraper conveyors are all fully enclosed scraper conveyors. This isolates the air inside the waste heat boiler and quench tower from the external environment, reducing negative pressure and temperature fluctuations during ash discharge from the quench tower.

[0011] As an optimization, the counterweight flap valve assembly includes at least two sets of counterweight flap valves. This can further reduce negative pressure fluctuations and temperature fluctuations during ash discharge from the quench tower.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] By setting up a sealed ash silo, ash and particulate ash can be temporarily stored, and the outside environment can be isolated to prevent cold air from entering the quench tower and lowering the flue gas temperature. The negative pressure fluctuation of the quench tower is also relatively small. By setting up a multi-stage ash discharge device and a first scraper conveyor, the quenched particulate ash and the ash from the waste heat boiler can be transported together through the multi-stage ash discharge device. The incineration line operates under negative pressure, and the temperature of the ash discharged from the waste heat boiler is around 200℃, which heats the air in the channels of the multi-stage ash discharge device and the first scraper conveyor. When the heavy hammer flap valve group discharges material, the air entering the quench tower will not cause the flue gas temperature of the quench tower to drop below the dew point temperature, avoiding local condensation and agglomeration of particulate ash, and preventing the heavy hammer flap valve group from jamming. The heavy hammer flap valve group can both unload material and seal the quench tower for airlock. This invention can reduce negative pressure fluctuations during ash discharge and prevent the temperature from dropping below the dew point temperature, effectively improving ash discharge efficiency and conveying efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present utility model.

[0015] In the diagram: 1. Waste heat boiler; 2. Quenching tower; 3. Gas transmission pipe; 4. Sealed ash silo; 5. First scraper conveyor; 6. Multi-stage ash discharge device; 7. Counterweight flap valve group; 8. Screw conveyor; 9. Second ash discharge pipe; 10. Second scraper conveyor; 11. Third scraper conveyor; 12. First ash discharge pipe. Detailed Implementation

[0016] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0017] Example 1

[0018] Figure 1 As one embodiment of this utility model, such as Figure 1 As shown, a waste heat boiler ash and quench tower granular ash co-conveying device includes a waste heat boiler 1 and a quench tower 2. The exhaust port of the waste heat boiler 1 is connected to the inlet of the quench tower 2 through a gas transmission pipe 3. The device also includes a sealed ash silo 4 and a first scraper conveyor 5. The ash discharge port of the waste heat boiler 1 is connected to the sealed ash silo 4 through a multi-stage ash discharge device 6. The quench tower 2 is connected to the feed port of the first scraper conveyor 5 through a counterweight flap valve group 7. The discharge port of the first scraper conveyor 5 is connected to the multi-stage ash discharge device 6.

[0019] By setting up a sealed ash silo 4, ash and granular ash can be temporarily stored and isolated from the outside environment, preventing cold air from entering the quench tower 2 and lowering the flue gas temperature. The negative pressure value of the quench tower 2 also fluctuates less. By setting up a multi-stage ash discharge device 6 and a first scraper conveyor 5, the granular ash from the quench tower 2 and the ash from the waste heat boiler 1 can be transported together through the multi-stage ash discharge device 6. The temperature of the ash discharged from the waste heat boiler 1 is around 200℃, which will heat the air in the channels of the multi-stage ash discharge device 6 and the first scraper conveyor 5. When the heavy hammer flap valve group 7 discharges material, the air entering the quench tower 2 will not cause the temperature of the quench tower 2 to drop below the dew point temperature, avoiding the agglomeration of granular ash after local condensation and preventing the heavy hammer flap valve group 7 from jamming. By setting up the heavy hammer flap valve group 7, it can both unload material and seal the quench tower 2 to lock the air.

[0020] A screw conveyor 8 is installed at the bottom of the quench tower 2. The ash discharge port of the screw conveyor 8 is connected to the feed port of the first scraper conveyor 5 through the second ash discharge pipe 9. A counterweight flap valve assembly 7 is installed on the second ash discharge pipe 9. By setting up the screw conveyor 8, the granular ash at the bottom of the quench tower 2 can be transported into the second ash discharge pipe 9. The counterweight flap valve assembly 7 can carry the granular ash. When the granular ash reaches a certain weight, the counterweight flap valve will open to discharge the material. After the material is discharged, the counterweight flap valve will close under its own weight to lock the air.

[0021] The multi-stage ash removal device 6 also includes a second scraper conveyor 10 and a third scraper conveyor 11. The inlet of the second scraper conveyor 10 is connected to the ash discharge port of the waste heat boiler 1, and the outlet of the second scraper conveyor 10 is connected to the inlet of the third scraper conveyor 11 through the first ash discharge pipe 12. The outlet of the third scraper conveyor 11 is connected to the sealed ash silo 4. By setting up the second scraper conveyor 10, the ash and slag discharged from the waste heat boiler 1 can be transported to the first ash discharge pipe 12 to avoid ash accumulation. By setting up the first ash discharge pipe 12 and the third scraper conveyor 11, the ash and slag from the waste heat boiler 1 and the particulate ash from the quench tower 2 can be uniformly and collaboratively transported to the sealed ash silo 4.

[0022] The discharge port of the first scraper conveyor 5 is connected to the first ash discharge pipe 12. It can discharge the particulate ash from the quench tower 2 to the third scraper conveyor 11.

[0023] The first scraper conveyor 5, the second scraper conveyor 10, and the third scraper conveyor 11 are all fully enclosed scraper conveyors. This isolates the air inside the waste heat boiler 1 and the quench tower 2 from the external environment, reducing negative pressure fluctuations and temperature fluctuations during ash discharge from the quench tower 2.

[0024] The counterweight flap valve assembly 7 includes at least two sets of counterweight flap valves. This can further reduce the negative pressure fluctuations and temperature fluctuations during ash discharge in the quench tower 2.

[0025] During operation, the temperature of the ash discharged from the bottom of the waste heat boiler 1 is around 200℃. When the granular ash is conveyed through the multi-stage ash discharge device 6, it heats the air inside the device. Since the multi-stage ash discharge device 6, the first scraper conveyor 5, and the second ash discharge pipe 9 are sequentially connected, the air temperature in the first scraper conveyor 5 and the second ash discharge pipe 9 also rises. The screw conveyor 8 at the bottom of the quench tower 2 pushes the granular ash onto the counterweight flap valve group 7. When a large amount of granular ash accumulates, the counterweight flap valve opens, and as the granular ash falls, air from the second ash discharge pipe 9 enters the quench tower 2. Because... The overall sealing of the sealed ash silo 4, multi-stage ash discharge device 6, first scraper conveyor 5, and second ash discharge pipe 9 ensures minimal fluctuations in the negative pressure of the quench tower 2. The heated air in the second ash discharge pipe 9 also prevents significant temperature fluctuations at the bottom of the quench tower 2, maintaining the temperature above the counterweight flap valve assembly 7 consistently above 180℃. After the granular ash is discharged, the counterweight flap valve in the counterweight flap valve assembly 7 automatically closes under gravity, allowing the granular ash to pass through the second ash discharge pipe 9 and the first scraper conveyor 5 into the first ash discharge pipe 12, and finally through the third scraper conveyor 11 into the sealed ash silo 4. This invention reduces negative pressure fluctuations at the outlet of the quench tower 2 during ash discharge and prevents the local temperature of the quench tower 2 from falling below the dew point, effectively improving ash discharge and conveying efficiency.

[0026] The descriptions of the orientation or relative positional relationships of the structure in this utility model, such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inner", and "outer", are based on the orientation or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the structure referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A co-conveying device for waste heat boiler ash and quench tower particulate ash, comprising a waste heat boiler (1) and a quench tower (2), wherein the exhaust port of the waste heat boiler (1) is connected to the inlet of the quench tower (2) via a gas transmission pipe (3), characterized in that: It also includes a sealed ash silo (4) and a first scraper conveyor (5). The waste heat boiler (1) is connected to the sealed ash silo (4) through a multi-stage ash discharge device (6). The quench tower (2) is connected to the feed inlet of the first scraper conveyor (5) through a heavy hammer flap valve group (7). The discharge outlet of the first scraper conveyor (5) is connected to the multi-stage ash discharge device (6).

2. The waste heat boiler ash and quench tower particle ash co-conveying device according to claim 1, characterized in that: The bottom of the quench tower (2) is equipped with a screw conveyor (8). The ash discharge port of the screw conveyor (8) is connected to the feed port of the first scraper conveyor (5) through the second ash discharge pipe (9). The counterweight flap valve group (7) is set on the second ash discharge pipe (9).

3. The waste heat boiler ash and quench tower particle ash co-conveying device according to claim 1, characterized in that: The multi-stage ash removal device (6) also includes a second scraper (10) and a third scraper (11). The feed inlet of the second scraper (10) is connected to the ash discharge port of the waste heat boiler (1). The discharge port of the second scraper (10) is connected to the feed inlet of the third scraper (11) through the first ash discharge pipe (12). The discharge port of the third scraper (11) is connected to the sealed ash silo (4).

4. The waste heat boiler ash and quench tower particle ash co-conveying device according to claim 3, characterized in that: The discharge port of the first scraper conveyor (5) is connected to the first ash discharge pipe (12).

5. The waste heat boiler ash and quench tower particle ash co-conveying device according to claim 4, characterized in that: The first scraper conveyor (5), the second scraper conveyor (10), and the third scraper conveyor (11) are all fully enclosed scraper conveyors.

6. The ash and char particle synergetic conveying device of a waste heat boiler according to any one of claims 1 to 5, characterized in that: The counterweight flap valve assembly (7) includes at least two sets of counterweight flap valves.

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