CN109110761B - System and method for preparing activated carbon by three-bed coupling - Google Patents
System and method for preparing activated carbon by three-bed coupling Download PDFInfo
- Publication number
- CN109110761B CN109110761B CN201710492761.7A CN201710492761A CN109110761B CN 109110761 B CN109110761 B CN 109110761B CN 201710492761 A CN201710492761 A CN 201710492761A CN 109110761 B CN109110761 B CN 109110761B
- Authority
- CN
- China
- Prior art keywords
- furnace
- communicated
- pipe
- activation
- air inlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The invention relates to a system for preparing active carbon by three-bed coupling, which comprises a raw material feeding unit, a baking reactor, a carbonization furnace, an activation furnace, a mixer, a reagent feeder I, a reagent feeder II, a combustion unit and an active carbon collecting unit, wherein the method comprises the steps of carrying out slow pyrolysis and activation on raw materials in a grading and sectioning way in sequence by combining the baking reactor, the carbonization furnace and the activation furnace to improve the yield of solid products, adding a chemical activator after the baking reactor or/and the carbonization furnace, utilizing the characteristics of good gas-solid and solid-solid mixing of a screw system (the baking reactor and the screw feeder), a spouted bed (the carbonization furnace), a fluidization and an internal circulating bed (the activation furnace), realizing baking, carbonization and activation integration, wherein hot flue gas generated by the combustion of volatile matters of the baking device and the carbonization gas directly or indirectly provides heat for the baking reactor, the carbonization furnace and the activation furnace, and the activation agent can also be heated, and the organic combination of physical activation and chemical activation is realized by improving the structure, optimizing the process route and operation parameters and the comprehensive utilization of the heat energy of volatile matters of the carbonization gas and the baking device, so that the efficiency, the active carbon is improved and the active effect is improved.
Description
Technical Field
The invention relates to a system and a method for preparing active carbon by three-bed coupling, in particular to a preparation method and a system which are uniform in solid-solid and gas-solid mixing, good in quality of active carbon, stable in product quality and high in system efficiency.
Background
Activated carbon is a widely used high-efficiency adsorbent because of its developed pore structure, high specific surface area, high surface activity and various surface chemical properties. The active carbon is a carbonaceous material with high specific surface area and strong adsorptivity, which is mainly prepared from coal, heavy petroleum and the like through a series of physicochemical processes. The active carbon products are of various types and can be divided into: coal-based activated carbon, wood activated carbon, fruit shell activated carbon, synthetic activated carbon, and the like. Along with the increasing demand of people for energy, the shortage problem of traditional fossil energy sources such as coal, petroleum and the like is increasingly serious, and the demand of activated carbon at home and abroad is increasingly large. Thus, the use of solid waste (e.g., discarded tires, forestry and agricultural residues, etc.) to produce activated carbon is an effective method to alleviate this contradiction.
The activated carbon is mainly activated by physical, chemical and physicochemical methods, and the template synthesis method is also being studied by scholars at home and abroad. The physical activation method uses water vapor and CO 2 Air or the mixture of the air and the mixture is used as an activating agent to react for a period of time at the temperature of 750-1100 ℃ to prepare the activated carbon; the chemical activation method generally adopts strong acid, strong alkali, salts and the like as activating agents for activation, and the common activating agents are H 3 PO 4 、KOH、ZnCl 2 、K 2 CO 3 Etc.
The common carbonization furnace is a fixed bed carbonization furnace and a moving bed carbonization furnace (such as a rotary kiln carbonization furnace, a screw carbonization furnace and the like); the activation furnace is core equipment for producing active carbon, and at present, the domestic active carbon production furnace comprises smoldering furnace, tubular furnace, mechanical raking type activation furnace, rotary furnace, fluidized bed furnace, flat plate furnace, siroper furnace and the like. The furnace type adopted by the foreign active carbon manufacturing factories mainly comprises a shaft furnace, a rotary furnace, a fluidized bed furnace and the like. In view of the problems of high resource consumption, heavy pollution in the production process, low yield of active carbon, low quality of active carbon, uneven quality and the like of the traditional activation furnace, development of a set of devices with high mechanization degree, convenient operation, comprehensive utilization of heat, high heat efficiency, high quality of active carbon and uniform quality of products is urgently needed.
Disclosure of Invention
The invention aims to solve the problems of low yield, low quality, uneven quality, low system efficiency and the like of active carbon in the existing active carbon production process and device, and develop a baking, carbonizing and activating integrated system and method with uniform solid-solid and gas-solid mixing, good quality of active carbon, high yield, stable product quality and high system efficiency.
The technical scheme for realizing the purpose of the invention is as follows: the method comprises the steps of sequentially carrying out slow pyrolysis and activation in sections by using a baking reactor, a carbonization furnace and an activation furnace, wherein a solid product of the baking reactor is a feed of the carbonization furnace, adding a chemical activating agent after the baking reactor or/and the carbonization furnace, realizing baking, carbonization and activation integration by utilizing the characteristics of a screw system of the baking reactor and a screw feeder and the characteristics of a carbonization furnace spouted bed, activation furnace fluidization and internal circulation bed gas-solid and solid-solid mixing, wherein hot flue gas generated by the burning of the volatile matters of the baking device and the carbonization gas directly or indirectly provides heat for the baking reactor, the carbonization furnace and the activation furnace, and can also heat the activating agent.
The system and the method for preparing the activated carbon by coupling the three beds comprise a raw material feeding unit, a baking reactor, a carbonization furnace, an activation furnace, a mixer, a first reagent feeder, a second reagent feeder, a combustion unit and an activated carbon collecting unit, wherein the baking reactor is a screw reactor, the baking reactor is communicated and connected with the screw feeder through a solid discharging pipe and a rotary valve of the baking reactor, a baked solid product has the characteristic of easy crushing, a screw of the screw feeder has the functions of stirring, crushing, mixing and conveying, the irregularly-shaped material can be crushed into powder, the first reagent feeder is communicated and connected with the screw feeder, an activating agent is added into the screw feeder, the activating agent and the baked solid product are conveyed to the carbonization furnace after being stirred and mixed by the screw, and activated tail gas from the activation furnace enters the first reagent feeder through an activated tail gas moving pipe and an air inlet pipe of the first reagent feeder, and the activated tail gas plays a role of air conveying and sealing; the carbonization furnace is communicated and connected with the mixer through a discharging pipe III, the mixer is communicated and connected with the activation furnace through a discharging pipe II, the activation furnace is communicated and connected with the activated carbon collecting unit through a discharging pipe I, the carbonization furnace is communicated and connected with the carbonization furnace cyclone separator through a connecting pipeline, the carbonization furnace cyclone separator is communicated and connected with the mixer through a carbonization furnace cyclone separator solid discharging pipe, and the carbonization furnace cyclone separator solid discharging pipe penetrates into the bottom of the mixer to ensure effective material sealing so as to prevent gas in the mixer from being upwards strung to the carbonization furnace cyclone separator; the reagent feeder II is communicated and connected with a solid blanking pipe of a cyclone separator of the carbonization furnace through a blanking pipe, the cyclone separator of the carbonization furnace is communicated and connected with an air inlet pipe of a combustion unit through a volatile removal pipe of the baking device, the air inlet pipe of the combustion unit is communicated and connected with the combustion unit, the combustion unit is communicated and connected with an activating furnace through an air inlet pipe of a side surface of the activating furnace, the air inlet pipe of the side surface of the activating furnace enters the activating furnace in a tangential direction of the side surface of the lower part of the activating furnace, the combustion unit is communicated and connected with the activating furnace through an air inlet pipe and a connecting pipe fitting of the activating furnace, the air inlet pipe of the activating furnace is communicated and connected with a gas distributor of the activating furnace, the gas distributor of the activating furnace is fixed below an inner circulating pipe, the inner circulating pipe is fixed at the radial center position of the activating furnace, the combustion unit is communicated and connected with the carbonization furnace through an air inlet pipe fitting of the carbonization furnace, and the combustion unit is communicated and connected with the mixer through an air inlet pipe and a connecting pipe fitting of the mixer, and a plurality of sealing baffles are fixed in the mixer; the activation furnace is communicated and connected with a cyclone separator of the activation furnace through a connecting pipeline, the cyclone separator of the activation furnace is communicated and connected with the lower part of the activation furnace through a solid feed back pipe of the cyclone separator of the activation furnace, the cyclone separator of the activation furnace is communicated and connected with an activated tail gas removing pipe, the activated tail gas removing pipe is respectively communicated and connected with a baking jacket air inlet pipe, a reagent feeder I air inlet pipe, a reagent feeder II air inlet pipe, a carbonization furnace air inlet pipe II and a carbonization furnace air inlet pipe III, the baking jacket air inlet pipe is communicated and connected with a baking jacket, the baking jacket is communicated and connected with an air outlet pipe of the baking jacket, the baking jacket air outlet pipe is communicated and connected with a drying unit, the drying unit is communicated and connected with a raw material feeding unit of the baking reactor, the reagent feeder I air inlet pipe is communicated and connected with the reagent feeder II, and the activated tail gas has the functions of preheating, air feeding and air sealing on the activating agent in the reagent feeder I and the reagent feeder II so as to ensure that the activating agent is smoothly added into a screw feeder and a mixer respectively, thereby promoting carbonization and activation effects and ensuring quality of activated carbon products; the second carbonization furnace air inlet pipe is communicated and connected with the first carbonization furnace air inlet pipe, the tangential position of the side surface of the lower part of the carbonization furnace air inlet pipe is communicated and connected with the carbonization furnace, the connection port of the carbonization furnace air inlet pipe is positioned slightly below the vertical direction of the screw feeder and the carbonization furnace connection port, a part of activated tail gas is mixed with a part of hot flue gas of the combustion unit and then enters the carbonization furnace, the tangential position of the side surface of the lower part of the carbonization furnace air inlet pipe sends a part of activated tail gas into the carbonization furnace to form rotational flow movement, and the heat of the activated tail gas is fully utilized to further carbonize baked solid products, so that the thermal efficiency of the system is improved and the product quality is improved.
According to the system and the method for preparing the activated carbon by the three-bed coupling combination, the diameter of the upper part of the activation furnace is larger, the diameter of the lower part of the activation furnace is smaller, the inner circulating pipe is fixed at the radial center position of the activation furnace, the gas distributor of the activation furnace is arranged below the inner circulating pipe, hot flue gas of the combustion unit enters the bottom of the inner circulating pipe of the activation furnace, gas is blown upwards in the inner circulating pipe, the annular flow passage between the outer wall of the inner circulating pipe and the inner wall of the activation furnace also has smaller fluidizing gas, the gas distribution with large middle gas speed and small gas speed in the peripheral annular area is realized by the structure and the arrangement of the gas distributor of the activation furnace, part of flue gas of the combustion unit enters the area with smaller diameter of the lower part of the activation furnace in the tangential direction of the side surface of the activation furnace, and the tangential gas inlet of the side surface is arranged at the position of the connecting port of the first blanking pipe and the second blanking pipe, which is slightly higher than the vertical direction of the activation furnace, so that the mode of combining the inner circulation, fluidization and rotational flow is formed, solid-solid and gas-solid mixing is greatly promoted, activation efficiency is improved, and activation effect is improved.
The three-bed coupling combined active carbon preparation system and method are characterized in that the carbonization furnace is of a conical structure with larger upper diameter and smaller lower diameter, the first carbonization furnace air inlet pipe is positioned at the bottom and the radial center of the carbonization furnace, mixed gas (or water vapor and the like) of hot flue gas and activated tail gas is input at the radial center of the bottom of the carbonization furnace after being mixed with the first carbonization furnace air inlet pipe and the second carbonization furnace air inlet pipe, spouted airflow is formed at the radial center of the bottom of the carbonization furnace so as to promote the turning of solids under the action of gravity and airflow and the mixing of solid, solid and gas, solid and solid, and the tangential position of the lower side of the carbonization furnace air inlet pipe sends part of the activated tail gas into the carbonization furnace so as to form rotational flow movement, and the spouted flow and rotational flow movement at the radial center of the bottom of the carbonization furnace are combined, so that the turbulent flow and the heat transfer mass transfer between solid, solid and solid, solid quality and uniformity of the carbonization efficiency of the carbonization system are improved, and the thermal efficiency of the system is further carbonized by utilizing the heat of the activated tail gas.
According to the system and the method for preparing the activated carbon by coupling the three beds, the solid blanking pipe of the cyclone separator of the carbonization furnace is extended into the bottom of the mixer, a plurality of sealing baffles are arranged in the mixer, the air inlet pipe of the mixer respectively enters the bottom surface and the side surface of the mixer, the reagent feeder II is communicated with the solid blanking pipe of the cyclone separator of the carbonization furnace through the blanking pipe, and the activating agent in the reagent feeder II and the solid which is discharged from the cyclone separator of the carbonization furnace are mixed and then enter the bottom of the mixer to ensure a material seal so as to prevent gas in the mixer from being mixed with the cyclone separator of the carbonization furnace; the flue gas or water vapor of the combustion unit is introduced between every two sealing baffles of the mixer, and the gas speed is gradually reduced from the direction of the carbonization furnace to the direction of the activation furnace, so that the solids in the mixer are in different degrees of fluidization states, the solid-solid and gas-solid mixing is promoted, the solids gradually flow from the direction of the carbonization furnace to the direction of the activation furnace and then enter the blanking pipe II, and the hot flue gas of the combustion unit is also introduced to the side surface of the lower part of the mixer at the side of the carbonization furnace so as to promote the lateral movement of the solids and gradually enter the activation furnace.
The system and the method for preparing the activated carbon by coupling the three beds are characterized in that a screw feeder is arranged below a baking reactor, a solid product of the baking reactor is communicated with the screw feeder through a solid discharging pipe and a rotary valve of the baking reactor, the screw feeder has the functions of mixing, crushing, stirring and conveying, the baked solid product has the characteristic of easy crushing, an active agent added into a reagent feeder I is mixed in the screw feeder and is stirred and conveyed to a carbonization furnace, and activated tail gas enters the reagent feeder I through an air inlet pipe of the reagent feeder I to play a role in preheating the active agent, air conveying and air sealing.
According to the system and the method for preparing the activated carbon by coupling the three beds, the dried raw materials enter the raw material feeding unit of the baking reactor and are conveyed to the baking reactor through the rotary valve, the baked solid products are conveyed to the screw feeder through the solid discharging pipe of the baking reactor through the rotary valve, and the screw feeder has the characteristics of easiness in crushing, high solid yield, high energy density and the like, and has the functions of stirring, crushing, mixing and conveying the baked solid products; by means of gravity, conveying equipment and gas feeding and sealing principle, the activating agent enters a screw feeder from a first reagent feeder and is mixed with baked solid products inside, and then enters a carbonization furnace; the hot flue gas and the activated tail gas of the combustion unit are mixed and then enter the carbonization furnace at the bottom of the carbonization furnace, a spouted gas flow is formed at the radial center position of the carbonization furnace so as to promote solid rolling and solid-solid and gas-solid mixing, meanwhile, the activated tail gas enters the carbonization furnace in the tangential direction of the side surface of the lower part of the carbonization furnace so as to form rotational flow movement, the spouted flow and the rotational flow movement at the center position are combined, solid-solid and gas-solid mixing and mass transfer are promoted, the carbonization efficiency is improved, the conical structure with small diameter at the lower part and large diameter at the upper part is adopted, the residence time of the solid in the carbonization furnace is prolonged, and the material entrainment of gas is reduced; meanwhile, the baking is carried out to the carbonization stage-by-stage treatment, so that the heating rate is reduced, and the yield of solid products is improved. The solid products of the carbonization furnace enter the mixer from the discharging pipe III, a plurality of sealing baffles are arranged in the mixer, flue gas or water vapor of a combustion unit is introduced between every two sealing baffles, the gas speed is gradually reduced from the direction of the carbonization furnace to the direction of the activation furnace, so that the solid in the mixer is in a fluidized state with different degrees, the solid-solid and gas-solid mixing effect is promoted, the solid gradually flows from the direction of the carbonization furnace to the direction of the activation furnace and then enters the discharging pipe II, and the hot flue gas of the combustion unit is also introduced at the side surface of the lower part of the mixer at the side of the carbonization furnace so as to promote the lateral movement of the solid and gradually enter the activation furnace; the carbonized gas from the carbonization furnace is subjected to gas-solid separation by the cyclone separator, the solid enters the bottom of the mixer through the solid blanking pipe of the cyclone separator of the carbonization furnace to ensure the material seal, the gas in the mixer is prevented from being strung to the cyclone separator of the carbonization furnace, the reagent feeder II is connected with the solid blanking pipe of the cyclone separator of the carbonization furnace through the blanking pipe, the activating tail gas has the functions of preheating, gas feeding and gas seal on the activating agent in the reagent feeder II, and the mixer not only promotes the mixing and mass transfer of solid-solid and gas-solid, but also effectively isolates the carbonization furnace and the activating furnace, and prevents the gas from being strung between the two furnaces. The solid of the mixer enters the activation furnace from the second discharging pipe, the activation furnace adopts a structural mode with larger upper diameter and smaller lower diameter to reduce the material entrainment of gas, hot flue gas of the combustion unit enters the bottom of the activation furnace from the air inlet pipe of the activation furnace and the gas distributor of the activation furnace, the gas distributor of the activation furnace is designed to distribute the gas and enable the gas speed of the inner circulating pipe to be faster, the gas speed of an annular area between the inner circulating pipe and the inner wall of the activation furnace to be slower, so that a mode of combining the inner circulating pipe, fluidization and rotational flow is formed, the solid rises rapidly from the bottom of the inner circulating pipe, the upper part of the inner circulating pipe is sprayed out, then the inner circulating mode of falling along the annular area between the inner circulating pipe and the inner wall of the activation furnace is adopted, moderate fluidization of the solid in the annular area can be ensured, part of flue gas of the combustion unit enters the activation furnace along the tangential direction through the air inlet pipe of the side surface of the activation furnace, the connecting point of the air inlet pipe of the side surface of the activation furnace and the activation furnace is positioned at a position slightly above the connecting point of the first discharging pipe and the second discharging pipe and the activation furnace in the vertical direction, and the tangentially entering air flow causes rotational flow movement of the material, so that the solid-solid mixing efficiency, the solid-solid mixing effect, the solid mass transfer effect and the solid mass transfer effect are greatly improved is improved; the activation tail gas of the activation furnace enters the cyclone separator of the activation furnace, entrained solid particles are returned to the activation furnace through the solid feed back pipe of the cyclone separator of the activation furnace, and the outside circulation of the activation furnace is used, so that the residence time of the solid in the activation furnace is prolonged, and the solid yield and the product quality are further improved. The activated tail gas sequentially enters a reagent feeder II, a baking device jacket, a reagent feeder I and a carbonization furnace to recycle the heat of the activated tail gas, and meanwhile, the activated tail gas also has the functions of air delivery and air sealing; the baking gas from the baking reactor and the carbonization gas from the carbonization furnace enter a combustion unit for combustion, and the hot flue gas provides required heat for the activation furnace and the carbonization furnace; the solid of the activation furnace enters an activated carbon collecting unit from a blanking pipe to be further cooled, washed, dried and the like.
The invention has the positive effects that: (1) The diameter of the upper part of the activation furnace of the method or the system is larger, the diameter of the lower part of the activation furnace is smaller, the inner circulating pipe is fixed at the radial center position of the activation furnace, the gas distributor of the activation furnace is arranged below the inner circulating pipe, hot flue gas or water vapor is blown upwards in the inner circulating pipe, the annular flow passage between the outer wall of the inner circulating pipe and the inner wall of the activation furnace also has smaller fluidizing gas, the gas distribution with large middle gas velocity and small peripheral annular region gas velocity forms the inner circulation of the activation furnace, and the solid-solid and gas-solid mixing and mass transfer are promoted; (2) The hot flue gas enters a region with smaller diameter at the lower part of the furnace in the tangential direction of the side surface of the activation furnace, and the side surface tangential air inlets are arranged at positions of the first discharging pipe and the second discharging pipe which are slightly above the vertical direction of a connecting port of the activation furnace, so that a mode of combining internal circulation, fluidization and rotational flow is formed, the solid-gas-solid mixing is greatly promoted, the activation efficiency is improved, the activation effect is improved, and the uniformity of the product quality is improved; (3) The carbonization furnace cyclone separator is communicated and connected with the mixer through a carbonization furnace cyclone separator solid blanking pipe, and the carbonization furnace cyclone separator solid blanking pipe goes deep into the bottom of the mixer to ensure effective material sealing so as to prevent gas in the mixer from being strung up to the carbonization furnace cyclone separator; (4) The mixer is internally provided with a plurality of sealing baffles, flue gas or water vapor of a combustion unit is introduced between every two sealing baffles of the mixer, the gas speed is gradually reduced from the direction of the carbonization furnace to the direction of the activation furnace, so that solids in the mixer are in different fluidization states, solid-solid and gas-solid mixing is promoted, the solids gradually flow from the direction of the carbonization furnace to the direction of the activation furnace and then enter a blanking pipe II, and the side surface of the lower part of the mixer at the side of the carbonization furnace is also provided with hot flue gas of the combustion unit so as to promote the lateral movement of the solids and gradually enter the activation furnace; (5) The hot flue gas of the combustion unit enters the bottom of the carbonization furnace from the gas inlet pipe of the carbonization furnace and enters the carbonization furnace in the tangential direction of the side surface of the lower part of the carbonization furnace, so that a flow mode combining central spouting flow and rotational flow is formed, the heat and mass transfer is promoted, and the carbonization efficiency and carbonization quality are improved; (6) The hot flue gas of the combustion unit respectively enters the activating furnace and the carbonization furnace, and the activating tail gas respectively enters the baking device jacket, the carbonization furnace, the first reagent feeder and the second reagent feeder, so that the gas-solid flow state is improved, the solid-solid and gas-solid mixing and mass transfer are promoted, the heat recovery and utilization are improved, and the system efficiency is improved.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, in which
FIG. 1 is a schematic diagram of the structure of the activated carbon production system of the present invention;
wherein:
1 an activation furnace, 2 a carbonization furnace, 3 a baking reactor, 4 an inner circulation pipe, 5 an activation furnace gas distributor, 6 an activation furnace cyclone, 7 an activation furnace cyclone solid feed back pipe, 8 an activated carbon collection unit, 9 a combustion unit, 10 a blanking pipe I, 11 a blanking pipe II, 12 a blanking pipe III, 13 an activation furnace air inlet pipe, 14 a carbonization furnace air inlet pipe I, 15 a mixer, 16 a sealing baffle, 17 a carbonization furnace cyclone, 18 a reagent feeder I, 19 a reagent feeder II, 20 a screw feeder, 21 a baking device jacket, 22 a raw material feed unit, 23 a drying unit, 24 a baking device volatile matter removal pipe, 25 a carbonization gas removal pipe, 26 a combustion unit air inlet pipe, 27 an activation tail gas removal pipe, 28 a baking device jacket air inlet pipe, 29 a baking device jacket air outlet pipe, 30 a reagent feeder air inlet pipe, 31 a carbonization furnace air inlet pipe II, 32 a carbonization furnace cyclone solid blanking pipe, 33 a baking reactor solid discharge pipe, 34 a mixer air inlet pipe, 35 a reagent feeder II, 36 a side air inlet pipe, 37 a carbonization furnace air inlet pipe III
Detailed Description
Example 1, see FIG. 1
The embodiment comprises a raw material feeding unit 22, a baking reactor 3, a carbonization furnace 2, an activation furnace 1, a mixer 15, a first reagent feeder 18, a second reagent feeder 19, a combustion unit 9 and an activated carbon collecting unit 8; the dried sawdust enters a raw material feeding unit 22 of a baking reactor 3 and is conveyed to the baking reactor 3 through a rotary valve, the baking reactor 3 is a screw reactor, baked solid products are conveyed to a screw feeder 20 through a solid discharging pipe 33 of the baking reactor through the rotary valve, the baked solid products have the characteristics of easy crushing, high solid yield, high energy density and the like, and the screw feeder 20 has the functions of stirring, crushing, mixing and conveying the baked solid products; by means of gravity, conveying equipment and gas feeding and sealing principle, KOH solid particles enter a screw feeder 20 from a first reagent feeder 18 and are mixed with baked solid products inside, and then enter a spouted bed carbonization furnace 2; the hot flue gas and the activated tail gas of the combustion unit 9 are mixed and then enter the carbonization furnace 2 at the bottom of the carbonization furnace 2, a spouted gas flow is formed at the radial center position of the carbonization furnace 2 so as to promote solid rolling and solid-solid and gas-solid mixing, meanwhile, the activated tail gas enters the carbonization furnace in the tangential direction of the side surface of the lower part of the carbonization furnace so as to form rotational flow movement, and the spouted gas flow and the rotational flow movement at the center position are combined, so that solid-solid and gas-solid mixing and mass transfer are further promoted, and the carbonization efficiency is improved; the conical structure with small diameter at the lower part and large diameter at the upper part prolongs the residence time of the solid in the carbonization furnace and reduces the material entrainment of gas; meanwhile, the baking is carried out to the carbonization grading and subsection heat treatment, so that the heating rate is reduced, and the yield of solid products is improved. The solid products of the carbonization furnace 2 enter a mixer 15 from a discharging pipe III 12, a plurality of sealing baffles 16 are arranged in the mixer 15, the smoke or water vapor of the combustion unit 9 is introduced between every two sealing baffles 16, the gas speed is gradually reduced from the direction of the carbonization furnace 2 to the direction of the activation furnace 1 so as to gradually fluidize the solids from the direction of the carbonization furnace 2 to the direction of the activation furnace 1 and then enter a discharging pipe II 11, and the hot smoke of the combustion unit 9 is also introduced at the side surface of the lower part of the mixer 15 at the side of the carbonization furnace 2 so as to promote the lateral movement of the solids and gradually enter the activation furnace 1; the carbonized gas from the carbonization furnace 2 is subjected to gas-solid separation by the carbonization furnace cyclone 17, the solid enters the bottom of the mixer 15 through the carbonization furnace cyclone solid blanking pipe 32 to ensure a seal, the gas in the mixer 15 is prevented from being strung to the carbonization furnace cyclone 17, KOH particles in the reagent feeder II 19 enter the bottom of the mixer 15 through the blanking pipe and the carbonization furnace cyclone solid blanking pipe 32, the activating tail gas has the functions of preheating, gas feeding and gas sealing on the activating agent in the reagent feeder II 19, and the mixer 15 not only promotes the mixing and mass transfer of solid, solid and gas, but also effectively isolates the carbonization furnace 2 and the activation furnace 1, and prevents the cross gas between the two furnaces. The solid of the mixer 15 enters the internal circulation fluidized bed activation furnace from the blanking pipe II 11, the activation furnace adopts a structural mode with larger upper diameter and smaller lower diameter to reduce the material entrainment of gas, hot flue gas of the combustion unit 9 enters the bottom of the activation furnace 1 through the activation furnace air inlet pipe 13 and the activation furnace gas distributor 5, the structural design of the activation furnace gas distributor 5 effectively distributes the gas and enables the gas speed of the internal circulation pipe 4 to be faster, the gas speed of an annular area between the internal circulation pipe 4 and the inner wall of the activation furnace 1 to be slower, thereby forming an internal circulation mode that the solid rises rapidly from the bottom of the internal circulation pipe 4, is sprayed out from the upper part of the internal circulation pipe 4, then falls along the annular area between the internal circulation pipe 4 and the inner wall of the activation furnace 1 and ensures moderate fluidization of the solid in the annular area, part of the flue gas of the combustion unit 9 enters the activation furnace 1 along the tangential direction through the activation furnace side air inlet pipe 36, the connection point of the activation furnace side air inlet pipe 36 and the activation furnace 1 is positioned at a position of the connection point of the lower part 10 and the blanking pipe II 11 and the activation furnace 1 in the vertical direction, the tangential inlet gas flow is slightly upward, thus the swirl flow and the solid flow can be formed, the solid mixing effect of the solid and the solid material can be improved, the swirl flow can be greatly and the solid mixing effect can be formed, and the solid swirl flow can be well, and the solid mixing effect can be improved, and the swirl flow effect can be formed; the activation tail gas of the activation furnace 1 enters the activation furnace cyclone separator 6, entrained solid particles are returned to the activation furnace 1 through the activation furnace cyclone separator solid feed back pipe 7, and the activation furnace 1 is used in an external circulation mode, so that the residence time of solids in the activation furnace 1 is prolonged, the solid yield is further improved, and the product quality is improved. The activated tail gas sequentially enters a reagent feeder II 19, a baking device jacket 21, a reagent feeder I18 and a carbonization furnace 2 to recycle the heat of the reagent feeder II, and meanwhile, the activated tail gas also has the functions of air feeding and air sealing; the activated tail gas from the baker jacket 21 enters a drying unit 23; the baking gas from the baking reactor 3 and the carbonization gas from the carbonization furnace 2 enter a combustion unit 9 for combustion, and the hot flue gas provides the required heat for the activation furnace 1 and the carbonization furnace 2; the solid in the activation furnace 1 enters the activated carbon collection unit 8 from the first discharging pipe 10 for further cooling, washing, drying and other treatments.
Example 2, see FIG. 1
The difference between this embodiment and embodiment 1 is that: the dried furfural residues enter a raw material feeding unit 22 of the screw baking reactor 3 and are conveyed to the baking reactor 3 through a rotary valve; k (K) 2 CO 3 The solid particles enter a screw feeder 20 from a first reagent feeder 18 and are mixed with the baked solid products inside, and then enter a spouted bed carbonization furnace 2; k in the reagent feeder II 19 2 CO 3 Particles enter the bottom of the mixer 15 through the discharging pipe and the solid discharging pipe 32 of the cyclone separator of the carbonization furnace; the other system composition was the same as in example 1.
While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the invention.
Claims (3)
1. A three-bed coupling combined active carbon preparation system comprises a raw material feeding unit (22), a baking reactor (3), a carbonization furnace (2), an activation furnace (1), a mixer (15), a reagent feeder I (18), a reagent feeder II (19), a combustion unit (9) and an active carbon collecting unit (8), and is characterized in that the baking reactor (3) is communicated and connected with a screw feeder (20) through a solid discharging pipe (33) and a rotary valve of the baking reactor, the reagent feeder I (18) is communicated and connected with the screw feeder (20), the screw feeder (20) is communicated and connected with the carbonization furnace (2), the carbonization furnace (2) is communicated and connected with the mixer (15) through a blanking pipe III (12), the mixer (15) is communicated and connected with the activation furnace (1) through a blanking pipe II (11), the activation furnace (1) is communicated and connected with an active carbon collecting unit (8) through a connecting pipe I, the carbonization furnace (2) is communicated and connected with a carbonization furnace cyclone (17) through a connecting pipe, the carbonization furnace cyclone (17) is communicated and connected with the solid mixer (15) through a carbonization furnace cyclone (32) through a blanking pipe II, the solid mixer (15) is communicated and connected with the solid mixer (32) through a blanking pipe II, the reagent feeder II (19) is communicated and connected with a solid blanking pipe (32) of a cyclone separator of the carbonization furnace through a blanking pipe, the cyclone separator (17) of the carbonization furnace is communicated and connected with an air inlet pipe (26) of a combustion unit through a carbonization gas moving pipe (25), a baking reactor (3) is communicated and connected with the air inlet pipe (26) of the combustion unit through a volatile moving pipe (24) of the baking device, the air inlet pipe (26) of the combustion unit is communicated and connected with the combustion unit (9), the combustion unit (9) is communicated and connected with the activation furnace (1) through an air inlet pipe (36) of the side surface of the activation furnace, the air inlet pipe (36) of the side surface of the activation furnace is connected with the activation furnace (1) in a tangential direction of the side surface of the lower part of the activation furnace (1), the combustion unit (9) is communicated and connected with the activation furnace (1) through an air inlet pipe fitting of the activation furnace, the air inlet pipe (13) of the activation furnace is communicated and connected with the air distributor (5) of the activation furnace, the air distributor (5) of the carbonization furnace is fixed below the inner circulation pipe (4), the inner pipe (4) is fixed at the radial center position of the activation furnace (1), the combustion unit (9) is connected with the air inlet pipe (9) of the activation furnace through a connecting pipe (14) and the air inlet pipe (2) through the connecting pipe fitting and the connecting pipe (15), a plurality of sealing baffles (16) are fixed in the mixer (15), the activation furnace (1) is communicated and connected with the activation furnace cyclone separator (6) through a connecting pipeline, the activation furnace cyclone separator (6) is communicated and connected with the activation furnace (1) through an activation furnace cyclone separator solid feed back pipe (7), the activation furnace cyclone separator (6) is communicated and connected with an activation tail gas moving pipe (27), the activation tail gas moving pipe (27) is respectively communicated and connected with a roasting device jacket air inlet pipe (28), a reagent feeder first air inlet pipe (30), a reagent feeder second air inlet pipe (35), a carbonization device air inlet pipe second (31) and a carbonization device air inlet pipe third (37), the roasting device jacket air inlet pipe (28) is communicated and connected with a roasting device jacket (21), the roasting device jacket (21) is communicated and connected with a roasting device jacket air outlet pipe (29), the roasting device jacket air outlet pipe (29) is communicated and connected with a drying unit (23), the drying unit (23) is communicated and connected with a raw material feeding unit (22) of the roasting reactor (3), the reagent feeder first air inlet pipe (30) is communicated and connected with a reagent feeder first air inlet pipe (18), the reagent feeder second air inlet pipe (31) is communicated and the carbonization device second air inlet pipe (31) is communicated and connected with the first air inlet pipe (14), the third air inlet pipe (37) of the carbonization furnace is communicated and connected with the carbonization furnace (2) at the tangential position of the side surface of the lower part of the carbonization furnace (2), the diameter of the upper part of the activation furnace (1) is larger, the diameter of the lower part of the activation furnace is smaller, the air inlet pipe (36) of the side surface of the activation furnace is connected with the activation furnace (1) at the tangential position of the activation furnace (1), the connecting ports of the third air inlet pipe (37) of the carbonization furnace are communicated and connected with the carbonization furnace (2) at the tangential position of the carbonization furnace (2) and at the position slightly above the connecting ports of the second air inlet pipe (11) and the activation furnace (1), the inner circulating pipe (4) is fixed at the radial center position of the activation furnace (1), the gas distributor (5) of the activation furnace is arranged below the inner circulating pipe (4), the carbonization furnace (2) is in a conical structure with larger upper part diameter and smaller lower part diameter, the first air inlet pipe (14) of the carbonization furnace is positioned at the bottom and radial center position of the carbonization furnace (2), and the connecting ports of the third air inlet pipe (37) of the carbonization furnace are communicated and connected with the carbonization furnace (2) at the tangential position of the carbonization furnace (2).
2. The system for preparing activated carbon by three-bed coupling according to claim 1, characterized in that: the carbonization furnace cyclone separator solid blanking pipe (32) stretches into the bottom of the mixer (15), a plurality of sealing baffles (16) are arranged in the mixer (15), the bottom surface and the side surface of the mixer (15) are connected with the mixer air inlet pipe (34), and the reagent feeder II (19) is communicated with the carbonization furnace cyclone separator solid blanking pipe (32) through a blanking pipeline.
3. The system for preparing activated carbon by three-bed coupling according to claim 1, characterized in that: the screw feeder (20) is arranged below the baking reactor (3), the baking reactor (3) is communicated with the screw feeder (20) through a solid discharging pipe (33) and a rotary valve of the baking reactor, the first reagent feeder (18) is communicated with the screw feeder (20), and the first reagent feeder air inlet pipe (30) is communicated with the first reagent feeder (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710492761.7A CN109110761B (en) | 2017-06-24 | 2017-06-24 | System and method for preparing activated carbon by three-bed coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710492761.7A CN109110761B (en) | 2017-06-24 | 2017-06-24 | System and method for preparing activated carbon by three-bed coupling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109110761A CN109110761A (en) | 2019-01-01 |
| CN109110761B true CN109110761B (en) | 2023-07-25 |
Family
ID=64733897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710492761.7A Active CN109110761B (en) | 2017-06-24 | 2017-06-24 | System and method for preparing activated carbon by three-bed coupling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109110761B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111732961B (en) * | 2020-06-28 | 2022-02-22 | 南京林业大学 | Continuous cleaning and carbonizing device for straws |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104891489A (en) * | 2015-06-08 | 2015-09-09 | 王润年 | Equipment for fluidization production of active carbon |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100113267A1 (en) * | 2007-05-17 | 2010-05-06 | Srivats Srinivasachar | System and method for coproduction of activated carbon and steam/electricity |
| CN101234762B (en) * | 2008-02-27 | 2011-01-12 | 邹炎 | Physical method energy-saving cleaning technique for manufacturing active carbon |
| CN207142836U (en) * | 2017-06-24 | 2018-03-27 | 北京化工大学 | The system that a kind of three couplings combination prepares activated carbon |
-
2017
- 2017-06-24 CN CN201710492761.7A patent/CN109110761B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104891489A (en) * | 2015-06-08 | 2015-09-09 | 王润年 | Equipment for fluidization production of active carbon |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109110761A (en) | 2019-01-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205156509U (en) | Rotatory flash drying system of combined thermal transmission formula | |
| CN102616759B (en) | Technique and device for preparing phosphoric acid by fluidized bed reactor | |
| CN102285650B (en) | Process for producing active carbon by using biomass for supplying heat and using fly ash | |
| CN103421527B (en) | Steam pipe drying, separating, and granulating integrated coal moisture control technology and special equipment thereof | |
| CN104152162B (en) | The pyrolysis system of broken coal pyrolysis and broken coal pyrolysis produce semicoke, the device and method of burnt oil and gas | |
| CN106939171A (en) | Biomass downlink cycle bed millisecond pyrolysis liquefaction technique | |
| CN102261822A (en) | Device for drying lignite by microwave fluidization | |
| CN204490826U (en) | A kind of pyrolysis of coal oil gas dust-removal system | |
| CN104973597A (en) | Production method of active carbon | |
| CN105000557A (en) | Recycling production method for agricultural wastes | |
| CN204874405U (en) | Biological oily preparation system | |
| CN113975919A (en) | Dry-method chlorine component recovery process based on cooperative disposal of chlorine-containing solid wastes by cement kiln | |
| CN101671570A (en) | Miniature movable type agricultural and forest biomass fast pyrolysis device | |
| CN105861080A (en) | Rapid catalytic pyrolysis system of biomass downward bed and biomass pyrolysis method | |
| CN103409156B (en) | Heat carrier destructive distillation system for coal and method thereof | |
| CN207142836U (en) | The system that a kind of three couplings combination prepares activated carbon | |
| CN109110761B (en) | System and method for preparing activated carbon by three-bed coupling | |
| CN108409365A (en) | A kind of excrement charing charcoal base composite fertilizer production system | |
| CN103450914B (en) | Method for producing liquid fuel by performing fast pyrolysis on solid organic matters | |
| CN105036126A (en) | Device for recycling agricultural wastes | |
| CN104973598A (en) | Active carbon production apparatus | |
| CN205347185U (en) | Hot -blast mud fluidized bed mummification device that spouts | |
| CN107011931A (en) | Reverse Concentric rotation formula pyrolytic reaction device | |
| CN106635111A (en) | Novel system for co-producing liquid fuel and biochar by biomass pyrolysis | |
| CN106190214A (en) | Biomass downlink cycle bed millisecond pyrolysis liquefaction device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |