A graded density differential activation device and method

Abstract

The present invention relates to a graded heterogeneous activation device and method, belonging to the field of activation of organic carbides. The device includes a heterogeneous activation furnace, a steam generator, and a burner. Inside the heterogeneous activation furnace, there is a finished activated carbon blanking chute, which is connected to a finished activated carbon bin. The furnace bottom is provided with a high-temperature resistant air distribution plate, on which high-temperature resistant alumina balls are laid. The top of the heterogeneous activation furnace is connected to the burner through the steam generator. A blower is provided between the steam generator and the burner. The burner is connected to the bottom of the heterogeneous activation furnace through a flue. The steam generator is connected to the bottom of the heterogeneous activation furnace through a steam pipe and a flue. The burner is connected to a liquefied gas tank, and a water inlet is provided on the steam generator. The activation method using the graded heterogeneous activation device enables steam, carbon dioxide, and carbonized material to fully contact and react, and almost 100% of the steam and carbon dioxide participating in the reaction can participate in the reaction; the device has a simple structure, is convenient to use, and operates stably.

Description

Technical Field

[0001] The present invention relates to a graded heterogeneous activation device and method, and the main application fields include the activation of coal-based carbon, the activation of biomass carbon, etc. The invention is directed to the activation or regeneration of all organic carbides. Background Art

[0002] Activated carbon is a kind of carbon treated specially. Organic raw materials (such as fruit shells, coal, wood, etc.) are heated under the condition of isolating air to reduce non-carbon components (this process is called carbonization), and then react with gases. The surface is eroded to produce a structure with developed micropores (this process is called activation). Since the activation process is a microscopic process, that is, the surface erosion of a large number of molecular carbides is point erosion, countless tiny pores are formed on the surface of activated carbon. The micropore diameters on the surface of activated carbon are mostly between 2 and 50 nm. Even a small amount of activated carbon has a huge surface area. The surface area of each gram of activated carbon is 500 - 1500 m 2 , and almost all applications of activated carbon are based on this characteristic of activated carbon.

[0003] According to different activation methods, the preparation of activated carbon mainly includes processes such as physical activation method, chemical activation method, chemical-physical activation method, catalytic activation method, and template method, etc. Among them, the physical activation method (common method), chemical activation method (relatively serious pollution, basically discontinued in large enterprises), and chemical-physical activation method (less used in large enterprises) have been widely applied industrially.

[0004] Chemical-Physical Activation Method

[0005] As the name implies, the chemical-physical activation method is a method that combines the application of physical activation and chemical activation, that is, the carbon is first treated by the chemical method and then further activated by the physical method. Foreign researchers obtained super activated carbon with a specific surface area of up to 3700 m 2 / g by the combined activation method of H3PO4 and CO2. The specific steps are to soak the wood raw material with H3PO4 at 85°C first, and then activate it with CO2 after carbonization at 450°C for 4 h.

[0006] Physical Activation Method

[0007] In the production of activated carbon by the physical activation method, the carbon-containing organic raw material is first carbonized, and then gas activators - steam, CO2, O2 (air), etc. are passed through the hot carbon layer and react with the carbon to carry out activation. Amorphous granular carbon is generally obtained by crushing harder carbon into a certain particle size, activating it, and then refining it. Shaped granular carbon is obtained by grinding carbon powder into fine powder, adding a binder to extrude it into a shape, and then carbonizing, activating, and sizing it.

[0008] Research shows that the prototype of the activated carbon microcrystalline structure has been formed during the carbonization of the raw material, that is, a basic microcrystalline structure similar to graphite. There are voids between the microcrystals. At this time, due to the precipitation and decomposition of tar substances, these voids are occupied or blocked by disordered "amorphous" carbon, resulting in a very small adsorption capacity of the carbonized product. When activation is carried out, substances such as tar in the voids and disordered carbon are first removed, opening the originally blocked pores. At this time, the surface of the basic microcrystals is exposed and reacts with the activator, resulting in burnout. The burnout of the microcrystals is uneven, and the burnout rate is greater in the direction parallel to the carbon layer than in the perpendicular direction. The carbon atoms at the corners and defective positions, that is, the carbon at the active sites, react with the gas at a relatively high rate. This uneven burnout of the microcrystals leads to the appearance of new pores. In the subsequent activation process, the pores continue to widen, and the walls between adjacent micropores are completely burned out to form larger pores, resulting in an increase in the volume of transitional pores and macropores. In short, these three processes are commonly used to explain the activation mechanism of pore generation during the activation process:

[0009] (1) The opening of the originally blocked pores;

[0010] (2) The expansion of the original pores and the burnout of the pore walls:

[0011] (3) The generation of new pores through the selective activation of certain structures.

[0012] The generation of pores is closely related to the oxidation degree of carbon, and the oxidation of carbon will inevitably consume carbon. Therefore, the burnout rate is commonly used to measure the activation degree of carbon and adjust the pore structure of activated carbon, which is a major feature of the physical activation method. According to Dubinin's view, when the burnout rate is less than 50%, microporous activated carbon is obtained; when the burnout rate is greater than 75%, macroporous activated carbon is obtained; when the burnout rate is between 50% - 75%, the activated carbon has a mixed structure.

[0013] The yield of carbon by the gas activation method is relatively low, but the finished product is relatively pure.

[0014] In production, oxygen-containing gases such as steam, flue gas, and air are used as activators to react with carbon for activation:

[0015] 1. Steam activation

[0016] The reaction of carbon with steam is:

[0017] C + H2O → H2 + CO - 131 kJ

[0018] Similar to the water gas reaction of carbon gasification, this activation reaction is an endothermic reaction - cooling effect, and heat should be supplied externally, so superheated steam is mostly used. The combustible reaction gas (water gas) generated is burned to recover heat, which can balance the heat supply.

[0019] Steam activation is slow and stable, and excellent activated carbon can be obtained, so it is widely used in production.

[0020] Steam activation is carried out under the condition of oxygen isolation at 750 - 950 °C. Oxygen will cause the loss of the carbon surface and reduce the yield of the carbon product. Therefore, the mixing of air (oxygen) should be minimized.

[0021] 2. Air (Oxygen) Activation

[0022] The reaction of carbon with oxygen is as follows:

[0023] C + O2 → CO2 + 386.2 kJ (below 600 °C)

[0024] 2C + O2 → 2CO + 225.6 kJ (800 - 900 °C)

[0025] Both of these reactions are exothermic reactions and can proceed at relatively low temperatures. The ratio of the two products CO and CO2 increases with the increase of temperature.

[0026] Due to the large amount of heat released by the reaction, it is difficult to control the normal temperature in the furnace. In particular, it is not easy to avoid local overheating, resulting in uneven activation and excessive loss. Generally, it is not used alone. Usually, an appropriate amount of steam is infiltrated into the air activator, and the endothermic effect of the water-gas reaction is used to control the temperature of the material layer.

[0027] 3. Flue Gas (CO) Activation

[0028] The reaction of carbon with carbon dioxide is as follows:

[0029] C + CO2 → 2CO - 170.5 kJ (850 - 1100 °C)

[0030] This reaction is also an endothermic reaction, and the temperature is even higher than that of steam activation. Generally, it is not used alone and is often used in combination with an appropriate amount of air and steam.

[0031] 4. Mixed Gas Activation

[0032] In industrial production, it is difficult to use a single activation gas for activation. Generally, a mixed gas of air and steam, flue gas and steam, flue gas and oxygen (air), etc. is used for activation, or two or more activation gases are used alternately for activation.

[0033] As mentioned above, when activating with a mixed gas of steam and air, if the mixing ratio is appropriate, the endothermic reaction can be balanced with the exothermic reaction, making the activation temperature stable and the activation uniform. In addition, some people think that the raw material carbon has various active sites. Some active sites are easy to react with steam, and some are easy to react with CO2. Using mixed gas activation is beneficial to improving the adsorption capacity of the activated carbon product.

[0034] There is also a method of staged activation, that is, first activate with steam at 800 °C for a short time, and then further activate with air at 500 - 600 °C; or first activate with steam at 800 °C and then activate with flue gas to improve the decolorizing power.

[0035] In the above production process of activated carbon, the contact time between water vapor and carbonized material is short, and most of the water vapor is discharged without reacting with the carbonized material, resulting in a large waste of water vapor and also a waste of energy. Summary of the Invention

[0036] In order to solve the problems of less contact between converter water vapor and carbonized material, large waste, long residence time, and much energy waste, the present invention provides a graded heterogeneous weight activation device and method. By using the fluidization of carbonized material, the contact area between water vapor and carbonized material is increased. Due to the different specific gravities of carbonized materials with different degrees of activation, the fully activated carbonized material is the lightest, the unactivated carbonized material is the heaviest, and the carbonized materials in between form a graded heterogeneity. Layers are formed during the fluidization process, and the activated activated carbon flows into the activated carbon collection device at the top layer.

[0037] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0038] A graded heterogeneous weight activation device includes a heterogeneous weight activation furnace, a steam generator, and a burner. An activated carbon finished product dropping chute is arranged inside the heterogeneous weight activation furnace, and the activated carbon finished product dropping chute is connected to an activated carbon finished product bin. The bottom of the heterogeneous weight activation furnace is provided with a high-temperature resistant air distribution plate, and high-temperature resistant alumina balls are laid on the bottom of the heterogeneous weight activation furnace and on the high-temperature resistant air distribution plate. The top of the heterogeneous weight activation furnace is connected to the burner through the steam generator. A blower is arranged between the steam generator and the burner. The burner is connected to the bottom of the heterogeneous weight activation furnace through a flue. The steam generator is also connected to the bottom of the heterogeneous weight activation furnace through a steam pipe and a flue. The burner is connected to a liquefied gas tank, and a water inlet is arranged on the steam generator.

[0039] Further, the side wall of the heterogeneous weight activation furnace is also connected to a screw feeder, and the carbonized material comes out of the carbonized material bin, enters the heterogeneous weight activation furnace through a metering device and the screw feeder.

[0040] Further, the heterogeneous weight activation furnace is divided into a dilute phase zone, a transition zone, and a dense phase zone. The dilute phase zone, the transition zone, and the dense phase zone are continuously distributed with activated material finished products, semi-finished products, and carbonized materials of different weights, forming a so-called grading.

[0041] Further, a gate valve is arranged between the activated carbon finished product dropping chute and the activated carbon finished product bin.

[0042] Further, the high-temperature resistant air distribution plate includes an air distribution plate, and a number of air holes with diameters gradually decreasing from the center to the outside are arranged on the air distribution plate.

[0043] Furthermore, the particle size of the high-temperature resistant alumina balls gradually decreases from the center outwards, ensuring uniform flue gas passage and playing a role in air distribution.

[0044] Furthermore, a manhole door is provided on the side wall of the differential density activation furnace.

[0045] Furthermore, the steam generator heats water into superheated steam with a temperature reaching 350 - 400 °C.

[0046] A grading differential density activation method, the specific process of which is as follows:

[0047] (1) In the start-up stage of the differential density activation furnace, first, liquefied gas in the liquefied gas tank is used as fuel and burned in the burner. The temperature of the flue gas generated by the combustion reaches 1150 °C - 1200 °C, and no thermal NO is generated. x , and it can also ensure that almost all the oxygen in the flue gas participates in the reaction, with the oxygen content in the flue gas being less than 0.5%; the flue gas passes through the high-temperature resistant air distribution plate along the flue, heating the high-temperature resistant alumina balls in the differential density activation furnace. The high-temperature resistant alumina balls play a role in heat storage and increasing the flue gas resistance, making the wind speed flowing through the high-temperature resistant alumina balls more uniform, and heating to 860 - 920 °C in the start-up stage of the differential density activation furnace; start the steam generator, heat water into superheated steam, and enter the differential density activation furnace through the steam pipe;

[0048] (2) The pre-prepared carbonized material is placed in the carbonized material bin and conveyed to the dense phase zone of the differential density activation furnace through the metering device and the screw feeder. The carbonized material in the dense phase zone reacts with water vapor and carbon dioxide, loses some weight, becomes a relatively light and partially activated semi-finished material, and enters the transition zone; the semi-finished material in the transition zone then enters the dilute phase zone of the differential density activation furnace and continues to react with water vapor and carbon dioxide, loses some weight, and becomes a lighter and fully activated finished material; the specific gravity of the finished material is lighter, and under the action of the fluidizing air, it falls into the activated carbon finished product blanking tank and is connected to the activated carbon finished product bin through the gate valve for collection;

[0049] (3) The temperature of the combustible gas generated by activation reaches 700 - 800 °C. The combustible gas passes through the steam generator to generate high-temperature steam required for activation. The high-temperature steam mixes with the flue gas in the flue and directly enters the differential density activation furnace; under the suction of the blower, the combustible gas enters the burner for combustion, and the supply of liquefied gas stops;

[0050] (4) Repeat the above (2) and (3).

[0051] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0052] 1. The present invention adopts a graded differential density activation device, where steam and carbon dioxide can fully contact and react with the carbonized material, and almost 100% of the steam and carbon dioxide participating in the reaction can react. Currently, the amount of steam and carbon dioxide participating in the reaction in a converter is less than 20%. Therefore, the present invention greatly improves the contact reaction between steam and carbon dioxide and the carbonized material.

[0053] 2. The device of the present invention has a simple structure, is easy to use, operates stably, can operate continuously, is convenient for load adjustment, and controls the residence time of materials according to the amount of feed and the amount of flue gas.

[0054] 3. The biomass carbonized material in the present invention can produce qualified activated carbon products after staying in the furnace for about 20 minutes, which is far lower than the 1 - 4 hours that the current biomass carbonized material needs to stay in the furnace. Therefore, the production of activated carbon can be greatly increased.

[0055] 4. The present invention adopts a differential density activation device, which can realize the continuous discharging of the finished activated carbon through the graded differential density of the carbonized material and the activated material, stably and conveniently.

[0056] 5. The present invention uses high-temperature resistant alumina balls as the heat storage and air distribution device, which can effectively increase the temperature of steam, enhance the reaction intensity, improve the uniformity of air distribution, reduce the flow impact of the flowing material on the air distribution plate, and extend the service life of the air distribution plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is a schematic structural diagram of the graded differential density activation device of the present invention;

[0058] Figure 2 It is a schematic structural diagram of the high-temperature resistant air distribution plate;

[0059] In the figure, 1. Carbonized material bin, 2. Measuring device, 3. Screw feeder, 4. Differential density activation furnace, 5. High-temperature resistant air distribution plate, 6. High-temperature resistant alumina balls, 7. Finished activated carbon blanking chute, 8. Gate valve, 9. Finished activated carbon bin, 10. Steam generator, 11. Water inlet, 12. Steam pipe, 13. Burner, 14. Flue, 15. Manhole door, 16. Blower, 17. Air holes, 18. Air plate, 19. Liquefied gas tank, 20. Dilute phase zone, 21. Transition zone, 22. Dense phase zone. EMBODIMENTS

[0060] The technical solutions and effects of the present invention will be further described below in conjunction with the drawings and specific embodiments, but the protection scope of the present invention is not limited thereto. Example 1

[0061] As Figure 1As shown in the figure, a grading type density difference activation device of the present invention includes a density difference activation furnace 4, a steam generator 10, and a burner 13. An activated carbon finished product dropping tank 7 is arranged inside the density difference activation furnace 4. The activated carbon finished product dropping tank 7 is connected to an activated carbon finished product bin 9. A high-temperature resistant air distribution plate 5 is arranged at the bottom of the density difference activation furnace 4, and high-temperature resistant alumina balls 6 are laid on the bottom of the density difference activation furnace 4 and the high-temperature resistant air distribution plate 5. The top of the density difference activation furnace 4 is connected to the burner 13 through the steam generator 10. A blower 16 is arranged between the steam generator 10 and the burner 13. The burner 13 is connected to the bottom of the density difference activation furnace 4 through a flue 14. The steam generator 10 is connected to the bottom of the density difference activation furnace 4 through a steam pipe 12 and the flue 14. The burner 13 is connected to a liquefied gas tank 19. A water inlet 11 is arranged on the steam generator 10.

[0062] In this embodiment, the side wall of the density difference activation furnace 4 is also connected to a screw feeder 3. The carbonized material comes out from the carbonized material bin 1, passes through a metering device 2, and enters the density difference activation furnace 4 through the screw feeder 3. In this embodiment, the screw feeder 3 is preferably inclined upward to ensure that the screw feeder 3 is filled with carbonized material and prevent air from entering.

[0063] In this embodiment, the density difference activation furnace 4 is divided into a dilute phase zone 20, a transition zone 21, and a dense phase zone 22. Different weights of activated material finished products, semi-finished products, and carbonized materials are continuously distributed in the dilute phase zone 20, the transition zone 21, and the dense phase zone 22, constituting the so-called grading.

[0064] In this embodiment, a gate valve 8 is arranged between the activated carbon finished product dropping tank 7 and the activated carbon finished product bin 9. The gate valve 8 mainly allows the activated material finished product to have a longer residence time in the activated carbon finished product dropping tank 7, and can be slowly cooled. The cooled activated carbon finished product falls into the activated carbon finished product bin 9. In this embodiment, the bottom of the activated carbon finished product dropping tank 7 is preferably set to be arc-shaped and has an opening at the bottom.

[0065] In this embodiment, the high-temperature resistant air distribution plate 15 is mainly made of high-temperature resistant materials and plays a role in supporting and air distribution. Its structure is as Figure 2 shown, including an air distribution plate 18. A number of air holes 17 with diameters gradually decreasing from the center to the outside are arranged on the air distribution plate 18 to ensure that the air volume entering the center is larger and the air volume at the edge is smaller. In this embodiment, the diameter of the air holes 17 is preferably 0.1 - 2 cm.

[0066] In this embodiment, the high-temperature resistant alumina balls 6 mainly store heat when the heterogeneous activation furnace 4 is started. Additionally, during operation, they increase the resistance of the flue gas and raise the temperature of the water vapor. In this embodiment, it is preferred that the particle size of the high-temperature resistant alumina balls 6 gradually decreases from the center outwards, ensuring uniform passage of the flue gas and playing a role in air distribution. Moreover, the gaps in the middle are larger, and the air volume passing through is slightly larger than that at the edges, promoting the internal tumbling of the carbonized material in the furnace and ensuring that the light materials can rise to the upper part. The high-temperature resistant alumina balls 6 in this embodiment have a relatively large specific gravity and do not flow. As a fixed bed material, they avoid the impact of flowing materials on the high-temperature resistant air distribution plate 5. When arranging the high-temperature resistant alumina balls 6, the air holes of the air distribution plate are staggered to ensure the smooth passage of the flue gas.

[0067] In this embodiment, a manhole door 15 is provided on the side wall of the heterogeneous activation furnace 4, which is used to place the high-temperature resistant alumina balls 6 before the start-up of the device and for equipment maintenance.

[0068] In this embodiment, the steam generator 10 heats water into superheated steam with a temperature reaching 350 - 400 °C.

[0069] In this embodiment, the liquefied gas tank is only used when starting the furnace. After normal operation, the liquefied gas is shut down. The burner mainly burns liquefied gas when starting the furnace and burns combustible gas during normal operation. Embodiment 2

[0070] A grading type heterogeneous activation method, which uses the grading type heterogeneous activation device of Embodiment 1. The specific process is as follows:

[0071] (1) In the start-up stage of the heterogeneous activation furnace, first use the liquefied gas in the liquefied gas tank as fuel to burn in the burner. The temperature of the flue gas generated by the combustion reaches 1150 °C - 1200 °C, and no thermal type NO x , is generated, and it can also ensure that almost all the oxygen in the flue gas participates in the reaction, with the oxygen content in the flue gas being less than 0.5%. The flue gas passes through the high-temperature resistant air distribution plate along the flue, heating the high-temperature resistant alumina balls in the heterogeneous activation furnace. The high-temperature resistant alumina balls play a role in heat storage and increasing the resistance of the flue gas, making the wind speed passing through the high-temperature resistant alumina balls more uniform. The furnace wall of the heterogeneous activation furnace is composed of refractory materials and is heated to 860 - 920 °C in the start-up stage of the heterogeneous activation furnace. Start the steam generator to heat water into superheated steam and enter the heterogeneous activation furnace through the steam pipe.

[0072] (2) The prefabricated carbonized material (preferably a cylinder or a sphere) is placed in the carbonized material bin and conveyed to the dense phase zone of the differential weight activation furnace (the range 30 cm above the high-temperature resistant alumina balls) through a metering device and a screw feeder. The carbonized material in the dense phase zone reacts with water vapor and carbon dioxide, loses part of its weight, and becomes a relatively light and partially activated semi-finished material, which enters the transition zone (the range 30 cm - 100 cm above the high-temperature resistant alumina balls); the semi-finished material in the transition zone then enters the dilute phase zone of the differential weight activation furnace (the range above 100 cm above the high-temperature resistant alumina balls), continues to react with water vapor and carbon dioxide, loses part of its weight, and becomes a lighter and fully activated finished material; the specific gravity of the finished material is lighter, and under the action of the fluidizing air, it falls into the activated carbon finished product blanking tank and is connected to the activated carbon finished product bin through a gate valve for collection;

[0073] (3) The temperature of the combustible gas generated by activation reaches 700 - 800 °C. The combustible gas passes through a steam generator to generate superheated steam that meets the activation requirements. The superheated steam directly enters the differential weight activation furnace after being mixed with the flue gas in the flue; under the suction of the blower, the combustible gas enters the burner for combustion, and the liquefied gas supply stops;

[0074] (4) Repeat the above steps (2) and (3).

[0075] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A graded density differential activation device, characterized in that, The device includes a differential density activation furnace, a steam generator, and a burner. Inside the differential density activation furnace, there is a finished activated carbon blanking chute, which is connected to a finished activated carbon silo. The bottom of the differential density activation furnace is provided with a high-temperature resistant air distribution plate, and high-temperature resistant alumina balls are laid on the bottom of the differential density activation furnace and on the high-temperature resistant air distribution plate. The top of the differential density activation furnace is connected to the burner through the steam generator. A blower is provided between the steam generator and the burner. The burner is connected to the bottom of the differential density activation furnace through a flue. The steam generator is also connected to the bottom of the differential density activation furnace through a steam pipe and the flue. The burner is connected to a liquefied gas tank, and the steam generator is provided with a water inlet.

2. The grading type density difference activation device according to claim 1, characterized in that, The side wall of the differential density activation furnace is also connected to a screw feeder. The carbonized material comes out of the carbonized material silo and enters the differential density activation furnace through the metering device and the screw feeder.

3. The grading type density difference activation device according to claim 1, characterized in that, The differential density activation furnace is divided into a dilute phase zone, a transition zone, and a dense phase zone. Different weights of finished activated material, semi-finished material, and carbonized material are continuously distributed in the dilute phase zone, the transition zone, and the dense phase zone, forming a so-called grading.

4. The graded density differential activation device according to claim 1, wherein, A gate valve is provided between the finished activated carbon blanking chute and the finished activated carbon silo.

5. The grading type density difference activation device according to claim 1, characterized in that, The high-temperature resistant air distribution plate includes an air distribution plate, and a number of air holes with gradually decreasing diameters from the center to the outside are arranged on the air distribution plate.

6. The graded density differential activation device according to claim 1, characterized in that, The particle size of the high-temperature resistant alumina balls gradually decreases from the center to the outside, ensuring uniform passing of the flue gas and playing a role in air distribution.

7. The graded density differential activation device according to claim 1, wherein A manhole door is provided on the side wall of the differential density activation furnace.

8. The graded density difference activation device according to claim 1, wherein The steam generator heats water into superheated steam with a temperature reaching 350 - 400 °C.

9. A grading type density current activation method, characterized in that, The specific process of this method is as follows: (1)During the start-up stage of the density difference activation furnace, first, liquefied gas in the liquefied gas tank is used as fuel and burned in the burner. The temperature of the flue gas generated by the combustion reaches 1150°C - 1200°C, and thermal NO is not generated. x , ensuring that almost all of the oxygen in the flue gas participates in the reaction, and the oxygen content in the flue gas is less than 0.5%. The flue gas passes through the high-temperature air distribution plate along the flue, heating the high-temperature alumina balls in the density difference activation furnace. The high-temperature alumina balls play a role in heat storage and increasing the flue gas resistance, making the wind speed flowing through the high-temperature alumina balls more uniform, and heating to 860 - 920°C during the start-up stage of the density difference activation furnace. Start the steam generator, heat the water into superheated steam, and enter the density difference activation furnace through the steam pipe. (2) The prefabricated carbonized material is placed in the carbonized material silo and is transported to the dense phase zone of the differential density activation furnace through the metering device and the screw feeder. The carbonized material in the dense phase zone reacts with water vapor and carbon dioxide, loses part of its weight, and becomes a relatively light, partially activated semi-finished material, which enters the transition zone. The semi-finished material in the transition zone then enters the dilute phase zone of the differential density activation furnace and continues to react with water vapor and carbon dioxide, loses part of its weight, and becomes an even lighter, fully activated finished material. The specific gravity of the finished material is lighter, and under the action of the fluidizing air, it falls into the finished activated carbon blanking chute and is connected to the finished activated carbon silo through the gate valve for collection; (3) The temperature of the combustible gas generated by activation reaches 700 - 800 °C. The combustible gas passes through the steam generator to generate high-temperature steam required for activation. The high-temperature steam mixes with the flue gas in the flue and directly enters the differential density activation furnace. Under the suction of the blower, the combustible gas enters the burner for combustion, and the supply of liquefied gas stops; (4) Repeat the above steps (2) and (3).

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