Tail gas recycling activated carbon processing equipment

Abstract

The utility model relates to a kind of active carbon processing equipment of tail gas recycling, including rotary furnace, first combustion furnace and second combustion furnace, the smoke outlet of first combustion furnace is connected with first smoke pipe, first smoke pipe is connected at the discharge side of rotary furnace by first shunt pipe away from its end, first smoke pipe and first shunt pipe are all equipped with first valve, the gas inlet of second combustion furnace is connected with inlet pipe, inlet pipe is connected at the feeding side of rotary furnace by second shunt pipe away from second combustion furnace side, inlet pipe is equipped with fan on second combustion furnace side, second combustion furnace top is equipped with evaporation chamber, the steam outlet of evaporation chamber is connected with steam pipe, steam pipe is connected at the discharge side of rotary furnace by third shunt pipe, steam pipe end and third shunt pipe are all equipped with second valve.The utility model can recover toxic flammable gas generated in rotary furnace during activation, discharge after secondary utilization, can reduce energy waste and reduce pollution caused to environment.

Description

Technical Field

[0001] This utility model belongs to the field of activated carbon processing and production technology, and specifically relates to an activated carbon processing equipment for tail gas recycling. Background Technology

[0002] Carbonization and activation are crucial steps in activated carbon processing. Activated carbon carbonization refers to the pyrolysis of carbon-containing organic raw materials (such as wood, nutshells, and coal) in a high-temperature environment with limited or no oxygen, decomposing non-carbon elements (such as hydrogen, oxygen, and nitrogen) to form a preliminary carbonaceous framework. Activated carbon activation is a key process for further developing the pore structure of the carbonized material and improving its adsorption performance. Typically, the carbonized material is placed in a rotary kiln and steam is introduced to maintain a suitable temperature, resulting in a porous structure within the carbon framework. However, during activation, the rotary kiln generates large amounts of toxic and flammable gases such as CO, H2, CH4, and VOCs. Direct emission of these gases not only wastes energy but also pollutes the environment. Utility Model Content

[0003] This invention provides an activated carbon processing equipment that recycles exhaust gas. It can recover toxic and combustible gases generated in the rotary kiln during the activation process, reuse them, and then discharge them, thereby reducing energy waste and minimizing environmental pollution.

[0004] The technical solution adopted in this utility model is as follows:

[0005] An activated carbon processing device for tail gas recycling includes a rotary kiln, a first combustion furnace, and a second combustion furnace. The exhaust port of the first combustion furnace is connected to a first exhaust pipe. The exhaust pipe, at its far end, is connected to the discharge side of the rotary kiln via a first branch pipe. A first valve is provided at the end of the first exhaust pipe and on the first branch pipe. The air inlet of the second combustion furnace is connected to an air inlet pipe. The air inlet pipe, at its far end, is connected to the feed side of the rotary kiln via a second branch pipe. A fan is provided on the air inlet pipe near the second combustion furnace. An evaporation chamber is provided at the top of the second combustion furnace. The exhaust port of the evaporation chamber is connected to an exhaust pipe. The exhaust pipe, at its far end, is connected to the discharge side of the rotary kiln via a third branch pipe. A second valve is provided at the end of the exhaust pipe and on the third branch pipe.

[0006] Furthermore, the rotary kiln includes a rotating drum and a first end plate and a second end plate disposed at both ends of the rotating drum. The first end plate and the second end plate are fixedly disposed. The rotating drum can rotate relative to the first end plate and the second end plate. The second diversion pipe is connected to the first end plate. The first diversion pipe and the third diversion pipe are both connected to the second end plate.

[0007] Furthermore, a temperature sensor is installed inside the rotary kiln, and the temperature sensor is located on the first end plate.

[0008] Furthermore, the end of the exhaust pipe is connected to a steam-using device.

[0009] Furthermore, there are three rotary kilns, and the second combustion furnace is equipped with a second exhaust pipe.

[0010] Furthermore, both the first valve and the second valve are two-position two-way valves.

[0011] Furthermore, the rotary kiln is covered with an insulation cover, and there is a gap between the insulation cover and the rotary kiln to allow flue gas to flow. The first valve is a three-position three-way valve, and the second valve is connected to one side of the insulation cover through a fourth diverter pipe. A third exhaust pipe is connected to the side of the insulation cover away from the fourth diverter pipe.

[0012] Furthermore, the exhaust end of the intake pipe is connected to the intake port of the first combustion furnace and the intake port of the second combustion furnace respectively through a third valve, wherein the third valve is a two-position three-way valve.

[0013] Furthermore, a fourth valve is provided on the second diversion pipe, which is a two-position two-way valve.

[0014] Furthermore, it also includes a control module, which is electrically connected to the first valve, the second valve, the third valve, the fourth valve, the fan, and the temperature sensor.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. The toxic and combustible gas generated in the rotary kiln during the activation process is drawn into the second combustion furnace through the air inlet pipe for secondary combustion to produce water vapor. This can avoid energy waste and reduce pollution to the environment. Moreover, the secondary combustion of toxic and combustible gas can produce a large amount of water vapor, which can be used for self-use or sold, thereby saving self-operation costs or generating additional economic efficiency.

[0017] 2. This utility model can be activated directly in the original rotary kiln after carbonization without the need for transfer, thus avoiding heat loss of activated carbon, saving energy, and improving the preparation efficiency of activated carbon.

[0018] 3. This utility model can also select different activation heating methods according to the quality of the activated carbon produced, so as to balance the quality of activated carbon and activation efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of Example 1;

[0020] Figure 2 This is a schematic diagram of the overall structure of Example 2;

[0021] In the diagram: 1. First combustion furnace; 2. First exhaust pipe; 3. Fan; 4. Rotary drum; 5. Temperature sensor; 6. First end plate; 7. Second branch pipe; 8. First valve; 9. Steam-using equipment; 10. Second valve; 11. Second end plate; 12. Third branch pipe; 13. First branch pipe; 14. Exhaust pipe; 15. Second exhaust pipe; 16. Second combustion furnace; 17. Evaporation chamber; 18. Inlet pipe; 19. Fourth valve; 20. Third exhaust pipe; 21. Third valve; 22. Insulation cover; 23. Fourth branch pipe. Detailed Implementation

[0022] To better understand the technical content of this utility model, specific embodiments are provided below, and the utility model will be further described in conjunction with the accompanying drawings.

[0023] Example 1

[0024] See Figure 1 This utility model provides an activated carbon processing device for tail gas recycling, including a rotary kiln, a first combustion furnace 1, and a second combustion furnace 16. The exhaust port of the first combustion furnace 1 is connected to a first exhaust pipe 2. The hot flue gas generated in the first combustion furnace 1 is discharged through the first exhaust pipe 2. The end of the first exhaust pipe 2 is connected to the discharge side of the rotary kiln through a first diversion pipe 13. A first valve 8 is provided at the end of the first exhaust pipe 2 and on the first diversion pipe 13. The first valve 8 is a normally closed two-position two-way valve. When the first valve 8 on the first exhaust pipe 2 is opened, the hot flue gas is transported into the rotary kiln through the first diversion pipe 13 to heat the activated carbon in the rotary kiln. When the temperature in the rotary kiln reaches the preset range, the first valve 8 on the first exhaust pipe 2 needs to be closed and the first valve 8 at the end of the first exhaust pipe 2 needs to be opened to allow the hot flue gas to be discharged from the end of the exhaust pipe. This can prevent the temperature in the rotary kiln from being too high and affecting the activation effect of the activated carbon.

[0025] The second combustion furnace 16 has an evaporation chamber 17 at its top, which heats the evaporation chamber 17 to generate steam. The evaporation chamber 17 has an exhaust pipe 14 connected to its exhaust port. The exhaust pipe 14, at its end, is connected to the discharge side of the rotary kiln via a third branch pipe 12. Both the exhaust pipe 14 and the third branch pipe 12 have second valves 10, which are normally closed two-position two-way valves. When activating activated carbon, the second valve 10 on the exhaust pipe 14 is closed, and the second valve 10 on the third branch pipe 12 is opened, allowing the steam in the evaporation chamber 17 to flow into the rotary kiln through the exhaust pipe 14 and the third branch pipe 12. If too much steam is produced, the second valve 10 on the exhaust pipe 14 can be opened to allow some steam to be discharged through the exhaust pipe 14, preventing excessive steam from flowing into the third branch pipe 12 and affecting the activation quality of the activated carbon.

[0026] The air inlet of the second combustion furnace 16 is connected to an air inlet pipe 18. The side of the air inlet pipe 18 away from the second combustion furnace 16 is connected to the feed side of the rotary kiln through a second diverter pipe 7. A fan 3 is installed on the side of the air inlet pipe 18 near the second combustion furnace 16. After the fan 3 is started, the fan 3 draws air through the air inlet pipe 18, so that the toxic and combustible gas generated in the rotary kiln during the activation process flows into the second combustion furnace 16 through the air inlet pipe 18 for secondary combustion to produce steam, which can reduce energy waste and reduce pollution to the environment.

[0027] Specifically, the rotary kiln includes a rotating drum 4 and a first end plate 6 and a second end plate 11 located at both ends of the rotating drum 4. The first end plate 6 and the second end plate 11 are fixedly installed, and the rotating drum 4 can rotate relative to the first end plate 6 and the second end plate 11. A second diversion pipe 7 is connected to the first end plate 6 and is used to discharge toxic and combustible gases generated in the rotary kiln. The first diversion pipe 13 and the third diversion pipe 12 are both connected to the second end plate 11, so that hot flue gas and water vapor can flow into the rotary kiln. The rotary kiln is a product commonly used in current production and will not be described in detail here.

[0028] Specifically, a temperature sensor 5 is installed inside the rotary kiln. The temperature sensor 5 is located on the side of the first end plate 6 facing the rotary drum 4. The temperature sensor 5 can monitor the temperature inside the rotary kiln. During activation, when the temperature inside the rotary kiln is higher than the upper limit of the temperature range, the first valve 8 on the first diversion pipe 13 is closed and the first valve 8 on the first exhaust pipe 2 is opened. When the temperature is lower than the lower limit of the temperature range, the first valve 8 on the first diversion pipe 13 is opened and the first valve 8 on the first exhaust pipe 2 is closed until the temperature is higher than the upper limit of the temperature range. This alternating control can keep the rotary kiln within a suitable temperature range during the activation process.

[0029] Specifically, the exhaust pipe 14 is connected to a steam-using device 9 at its end. The steam-using device 9 includes direct steam-using devices such as drying or baking equipment, or indirect steam-using devices such as power generation equipment. Of course, the steam-using device 9 can also refer to steam-using devices inside or outside the plant. When it is an external steam-using device 9, the produced steam can be sold to generate economic benefits.

[0030] Specifically, there are 3 rotary kilns, and the activation can be carried out simultaneously using 3 rotary kilns. The second combustion furnace 16 is equipped with a second exhaust pipe 15 for exhausting smoke.

[0031] Example 2

[0032] See Figure 2 The difference from Example 1 is as follows:

[0033] Specifically, the rotary kiln is covered with an insulation cover 22. There is a gap between the insulation cover 22 and the rotary kiln to allow flue gas to flow. The first valve 8 is a normally closed three-position three-way valve. Compared with the conventional two-position two-way valve, the three-position three-way valve has one more position, in which all three interfaces are blocked and not connected. The second valve 10 is connected to one side of the insulation cover 22 through the fourth diversion pipe 23. The insulation cover 22 is connected to the third exhaust pipe 20 on the side away from the fourth diversion pipe 23. The second diversion pipe 7 is equipped with a fourth valve 19, which is a normally closed two-position two-way valve.

[0034] When carbonization is required:

[0035] After organic raw materials such as coconut shells are put into the rotary kiln, the first valve 8 at the end of the first exhaust pipe 2 is controlled to block the end of the first exhaust pipe 2 to prevent hot flue gas from flowing out from the end of the first exhaust pipe 2. The fourth valve 19 is controlled to open the second diversion pipe 7, and the first valve 8 is controlled to open the first diversion pipe 13, so that the hot flue gas generated by the first combustion furnace 1 flows into the rotary kiln through the first diversion pipe 13 for a preset time, which can preheat the raw materials and also discharge most of the oxygen in the rotary kiln.

[0036] Subsequently, the fourth valve 19 is closed, and the first valve 8 on the first diversion pipe 13 is opened to open the fourth diversion pipe 23. While preventing hot flue gas from flowing into the rotary kiln through the first diversion pipe 13, the hot flue gas in the first exhaust pipe 2 flows into the heat insulation cover 22 through the fourth diversion pipe 23. The hot flue gas is used to heat the rotary kiln wall, thereby indirectly heating the organic raw materials in the rotary kiln.

[0037] Temperature sensor 5 monitors the temperature inside the rotary kiln. When the temperature inside the rotary kiln exceeds the upper limit of the preset temperature range, the first valve 8 on the first diversion pipe 13 blocks the connection between the first diversion pipe 13 and the fourth diversion pipe 23, preventing hot flue gas from flowing into the rotary kiln and the insulation hood 22. The first valve 8 on the first exhaust pipe 2 is then opened at its end, allowing hot flue gas to be discharged through the first exhaust pipe 2. When the temperature is below the lower limit of the temperature range, the first valve 8 on the first diversion pipe 13 opens the connection between the first exhaust pipe 2 and the fourth diversion pipe 23, allowing hot flue gas to flow into the insulation hood 22 (but not into the rotary kiln). The first valve 8 on the first exhaust pipe 2 is then closed to prevent hot flue gas from being discharged through the first exhaust pipe 2, allowing for rapid heating until the temperature exceeds the upper limit of the preset temperature range. This alternating control ensures that the rotary kiln is kept within a suitable temperature range for carbonization.

[0038] When activation is required:

[0039] Since the activation temperature is generally higher than the carbonization temperature, after carbonization, activation can be carried out directly in the rotary kiln, which avoids the inconvenience of transferring high-temperature activated carbon and also avoids the loss of temperature of the rotary kiln and activated carbon.

[0040] (1) When using activated carbon with high activation quality requirements:

[0041] The fourth valve 19 is opened, and the first valve 8 on the first diversion pipe 13 is opened to connect the fourth diversion pipe 23. While preventing hot flue gas from flowing into the rotary kiln through the first diversion pipe 13, the hot flue gas in the first exhaust pipe 2 flows into the heat insulation cover 22 through the fourth diversion pipe 23. The hot flue gas is used to heat the rotary kiln, and then heat the activated carbon in the rotary kiln. Since the hot flue gas indirectly heats the activated carbon in the rotary kiln, it can avoid the hot flue gas affecting the activated carbon, and thus can produce higher quality activated carbon. However, since it is indirect heating, the heating reaction rate is slow and the activation efficiency is low.

[0042] Temperature sensor 5 monitors the temperature inside the rotary kiln. When the temperature inside the rotary kiln is higher than the upper limit of the preset temperature range, the first valve 8 on the first diversion pipe 13 blocks the first diversion pipe 13 and the fourth diversion pipe 23 to prevent hot flue gas from flowing into the rotary kiln and the insulation hood 22. The first valve 8 on the first exhaust pipe 2 opens its end, allowing hot flue gas to be discharged through the first exhaust pipe 2. When the temperature is lower than the lower limit of the temperature range, the first valve 8 on the first diversion pipe 13 opens the space between the first exhaust pipe 2 and the fourth diversion pipe 23, allowing hot flue gas to flow into the insulation hood 22. The first valve 8 on the first exhaust pipe 2 closes to prevent hot flue gas from being discharged through the first exhaust pipe 2, allowing for rapid heating until the temperature exceeds the upper limit of the temperature range. This alternating control keeps the rotary kiln within a suitable temperature range for activation.

[0043] During the above temperature-controlled heating process, the second combustion furnace 16 heats the evaporation chamber 17, causing it to generate water vapor. The second valve 10 on the exhaust pipe 14 is closed, and the second valve 10 on the third diversion pipe 12 is opened, allowing the water vapor in the evaporation chamber 17 to flow into the rotary kiln through the exhaust pipe 14 and the third diversion pipe 12. When too much water vapor is produced, the second valve 10 on the exhaust pipe 14 can be opened, allowing some water vapor to be discharged through the exhaust pipe 14, thus preventing excessive water vapor from flowing into the third diversion pipe 12 and affecting the activation quality of the activated carbon. During this process, the blower 3 draws air through the air inlet pipe 18, allowing the toxic and combustible gas generated in the rotary kiln during activation to flow into the air inlet pipe 18 through the second diversion pipe 7, and then into the second combustion furnace 16 for secondary combustion to generate water vapor.

[0044] (2) When activating activated carbon with low quality requirements:

[0045] The fourth valve 19 is opened, and the first valve 8 on the first diversion pipe 13 is opened to conduct the first diversion pipe 13. While preventing hot flue gas from flowing back into the insulation cover 22 through the fourth diversion pipe 23, the hot flue gas in the first exhaust pipe 2 flows into the rotary kiln through the first diversion pipe 13 to contact the activated carbon and directly heat the activated carbon in the rotary kiln. The heating efficiency and activation efficiency are high.

[0046] Temperature sensor 5 can monitor the temperature inside the rotary kiln. When the temperature inside the rotary kiln is higher than the upper limit of the preset temperature range, the first valve 8 on the first diversion pipe 13 can be controlled to block the first diversion pipe 13 and the fourth diversion pipe 23, preventing hot flue gas from flowing into the rotary kiln and the insulation hood 22. The first valve 8 on the first exhaust pipe 2 can be controlled to open its end, allowing hot flue gas to be discharged through the first exhaust pipe 2. When the temperature is lower than the lower limit of the temperature range, the first valve 8 on the first diversion pipe 13 can be controlled to open the space between the first exhaust pipe 2 and the first diversion pipe 13, allowing hot flue gas to flow into the rotary kiln. The first valve 8 on the first exhaust pipe 2 can be controlled to close, preventing hot flue gas from being discharged through the first exhaust pipe 2. The temperature can be rapidly increased until it is higher than the upper limit of the temperature range. This alternating control can keep the rotary kiln within a suitable temperature range for activation.

[0047] During the temperature control and heating process described above, it is also necessary to supply steam into the rotary kiln. The method is the same as described above and will not be described in detail here.

[0048] It should be noted that when the activation quality requirement is between that of the first and second methods mentioned above, the activation quality and efficiency can be balanced by adjusting the duty cycle of the first valve alternately supplying hot flue gas into the rotary kiln and the insulation hood.

[0049] Specifically, the exhaust end of the intake pipe 18 is connected to the air inlet of the first combustion furnace 1 and the air inlet of the second combustion furnace 16 via a third valve 21. The third valve 21 is a two-position three-way valve. By selectively controlling the third valve 21, the intake pipe 18 can be connected to the air inlet of the first combustion furnace 1 and the air inlet of the second combustion furnace 16. Based on the specific combustion requirements of the first and second combustion furnaces 16, toxic and combustible gases can be selectively delivered to both furnaces for secondary combustion, thus improving and optimizing resource utilization. It should be noted that when both furnaces are burning, toxic and combustible gases are preferentially delivered to the second combustion furnace 16.

[0050] Specifically, it also includes a control module, which is electrically connected to the first valve 8, the second valve 10, the third valve 21, the fourth valve 19, the fan 3, and the temperature sensor 5. The temperature signal monitored by the temperature sensor 5 is transmitted to the control module, which then controls the operation of the relevant electrical components according to the above control method to achieve automated control, making the carbonization and activation control operations simpler.

[0051] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An activated carbon processing device for tail gas recycling, characterized in that: The system includes a rotary kiln, a first combustion furnace, and a second combustion furnace. The exhaust port of the first combustion furnace is connected to a first exhaust pipe. The exhaust pipe, at its farthest point, is connected to the discharge side of the rotary kiln via a first branch pipe. Both the end of the first exhaust pipe and the first branch pipe are equipped with first valves. The air inlet of the second combustion furnace is connected to an air inlet pipe. The air inlet pipe, at its farthest point, is connected to the feed side of the rotary kiln via a second branch pipe. A fan is installed on the air inlet pipe near the second combustion furnace. An evaporation chamber is located at the top of the second combustion furnace. The exhaust port of the evaporation chamber is connected to an exhaust pipe. The exhaust pipe, at its farthest point, is connected to the discharge side of the rotary kiln via a third branch pipe. Both the end of the exhaust pipe and the third branch pipe are equipped with second valves.

2. The activated carbon processing equipment for tail gas recycling according to claim 1, characterized in that: The rotary kiln includes a rotating drum and a first end plate and a second end plate disposed at both ends of the rotating drum. The first end plate and the second end plate are fixedly disposed. The rotating drum can rotate relative to the first end plate and the second end plate. The second diversion pipe is connected to the first end plate. The first diversion pipe and the third diversion pipe are both connected to the second end plate.

3. The activated carbon processing equipment for tail gas recycling according to claim 2, characterized in that: The rotary kiln is equipped with a temperature sensor, which is located on the first end plate.

4. The activated carbon processing equipment for tail gas recycling according to claim 1, characterized in that: The exhaust pipe is connected to a steam-using device at its end.

5. The activated carbon processing equipment for tail gas recycling according to claim 1, characterized in that: There are three rotary kilns, and the second combustion furnace is equipped with a second exhaust pipe.

6. The activated carbon processing equipment for tail gas recycling according to claim 1, characterized in that: Both the first valve and the second valve are two-position two-way valves.

7. The activated carbon processing equipment for tail gas recycling according to claim 3, characterized in that: The rotary kiln is covered with an insulation cover, and there is a gap between the insulation cover and the rotary kiln to allow flue gas to flow. The first valve is a three-position three-way valve, and the second valve is connected to one side of the insulation cover through a fourth diversion pipe. A third exhaust pipe is connected to the side of the insulation cover away from the fourth diversion pipe.

8. The activated carbon processing equipment for tail gas recycling according to claim 6, characterized in that: The exhaust end of the air inlet pipe is connected to the air inlet of the first combustion furnace and the air inlet of the second combustion furnace respectively through a third valve, which is a two-position three-way valve.

9. The activated carbon processing equipment for tail gas recycling according to claim 7, characterized in that: The second diversion pipe is equipped with a fourth valve, which is a two-position two-way valve.

10. The activated carbon processing equipment for tail gas recycling according to claim 8, characterized in that: It also includes a control module, which is electrically connected to the first valve, the second valve, the third valve, the fourth valve, the fan, and the temperature sensor.

Images